From 7afd09cf3e995c660773b21d2b94c4db50edf593 Mon Sep 17 00:00:00 2001 From: Michael Tautschnig Date: Tue, 10 Nov 2026 09:50:40 +0000 Subject: [PATCH 1/3] Regression tests: tags for C++ tests that need particular headers Tests of the C++ front end depend on the standard library headers cbmc preprocesses with (the host gcc's libstdc++, libc++, or the MSVC STL) and on GNU extensions or the Itanium ABI. regression/cbmc-cpp's CMake and Makefile now exclude, according to the host: - libcxx (run, as CORE only, in a profile of its own where clang and the libc++ headers are installed), msvc-stl (only with MSVC); - libstdcxx, libstdcxx12, libstdcxx13, libstdcxx16 (when the host gcc is not GNU gcc, or older than the version), broken-libstdcxx16 (with GCC 16 or later); - gnu-extensions and itanium-abi with MSVC; gcc-only also when the build compiler is not GNU (in regression/cpp, too). CORE runs in four shards with a per-test timeout of 900 s, and without --validate-goto-model with GCC < 13. regression/README.md documents the tags. No test uses them yet: they are for the C++ tests to follow. Co-authored-by: Kiro --- regression/README.md | 41 +++++++++++++ regression/cbmc-cpp/CMakeLists.txt | 98 ++++++++++++++++++++++++++++-- regression/cbmc-cpp/Makefile | 49 ++++++++++++++- regression/cpp/CMakeLists.txt | 3 +- regression/cpp/Makefile | 4 ++ 5 files changed, 187 insertions(+), 8 deletions(-) diff --git a/regression/README.md b/regression/README.md index d8a758b67e97..cfed85a6d503 100644 --- a/regression/README.md +++ b/regression/README.md @@ -15,6 +15,47 @@ This folder contains the CProver regression test-suite. - `thorough-smt-backend`: These tests are too slow to be run in CI with the SMT backend. +### Standard library headers (`cbmc-cpp`) + +- `libcxx`: + These tests need the libc++ headers (`--stdlib libc++`); they are run only + where libc++ is installed. +- `libstdcxx`: + These tests pass only with the libstdc++ headers: they check details of + those headers (internal names, or the header shapes the test was reduced + from), or with libc++ or the MSVC STL they fail for a known bug, named in + the desc (with its KNOWNBUG where it could be reduced). + `regression/cbmc-cpp`'s CMake and Makefile exclude them, and the + `libstdcxxNN` tags, when cbmc does not preprocess with GNU gcc: with + MSVC, or where `gcc` is clang (macOS). +- `libstdcxx12`, `libstdcxx13`, `libstdcxx16`: + These tests need the libstdc++ headers of GCC 12, 13 or 16 (respectively) + or later. + cbmc preprocesses with the host `gcc`, so `regression/cbmc-cpp`'s CMake and + Makefile exclude the tags whose version the host `gcc -dumpversion` does not + meet (`-X libstdcxx16`): with older headers the test would not exercise the + header shape it was written for. A test for such a shape belongs here as + `CORE gcc-only libstdcxx16`, not as KNOWNBUG. +- `broken-libstdcxx16`: + A CORE test known to fail with the libstdc++ 16 headers; excluded (like + `libstdcxx16`, by the host `gcc -dumpversion`) when the host gcc is 16 or + later. This is temporary: each such test has a KNOWNBUG, reduced to its + root cause and named in the test's desc, and the tag is removed when that + KNOWNBUG is fixed. +- `gcc16`: + Tests motivated by the libstdc++ 16 header shapes; a grouping tag only (the + test may pass with older headers too). Combine with `libstdcxx16` when the + newer headers are required. +- `gnu-extensions`: + Tests of GNU extensions (`__attribute__`, `__alignof__`, GNU builtins, + `__complex__`) that both gcc and clang accept; excluded with MSVC. +- `itanium-abi`: + Tests of class layouts that the Itanium C++ ABI (gcc and clang) defines and + the MSVC ABI defines differently, such as bit-field allocation; excluded + with MSVC. +- `gcc-only`: + Tests that need `goto-cc` in gcc mode (excluded with MSVC or a non-GNU + build compiler). ### Solver - `broken-cprover-smt-backend`: diff --git a/regression/cbmc-cpp/CMakeLists.txt b/regression/cbmc-cpp/CMakeLists.txt index 4d141f395e62..965329b3bdf2 100644 --- a/regression/cbmc-cpp/CMakeLists.txt +++ b/regression/cbmc-cpp/CMakeLists.txt @@ -1,9 +1,99 @@ -if("${CMAKE_CXX_COMPILER_ID}" STREQUAL "MSVC") +if("${CMAKE_CXX_COMPILER_ID}" STREQUAL "MSVC" OR + NOT "${CMAKE_CXX_COMPILER_ID}" STREQUAL "GNU") set(gcc_only -X gcc-only) else() set(gcc_only "") endif() +# GNU extensions (__attribute__, __alignof__, GNU builtins), which g++ and +# clang++ accept and cbmc's Visual Studio mode does not +# and layouts of the Itanium C++ ABI (bit fields), which MSVC's ABI does not +# share +if("${CMAKE_CXX_COMPILER_ID}" STREQUAL "MSVC") + list(APPEND gcc_only -X gnu-extensions -X itanium-abi) +else() + # tests of the MSVC STL, which needs cl's preprocessing + list(APPEND gcc_only -X msvc-stl) +endif() + +# Tests tagged `libstdcxxNN' need the libstdc++ headers of GCC >= NN (13: +# ): cbmc preprocesses with the HOST gcc (not necessarily the +# compiler cmake builds with), so ask it, and exclude the tags whose +# requirement it does not meet. +find_program(HOST_GCC gcc) +# `gcc' may be clang (macOS), whose standard library is libc++: then no test +# that needs the libstdc++ headers can run (`libstdcxx', `libstdcxxNN'). +# With MSVC, cbmc preprocesses with cl (the MSVC STL) whatever gcc is +# installed (Strawberry Perl ships one). +set(host_gcc_is_gnu FALSE) +if(HOST_GCC AND NOT "${CMAKE_CXX_COMPILER_ID}" STREQUAL "MSVC") + execute_process( + COMMAND ${HOST_GCC} --version + OUTPUT_VARIABLE HOST_GCC_VERSION_TEXT + ERROR_QUIET) + if(NOT HOST_GCC_VERSION_TEXT MATCHES "clang") + set(host_gcc_is_gnu TRUE) + endif() +endif() +if(host_gcc_is_gnu) + execute_process( + COMMAND ${HOST_GCC} -dumpversion + OUTPUT_VARIABLE HOST_GCC_VERSION + OUTPUT_STRIP_TRAILING_WHITESPACE + ERROR_QUIET) + foreach(libstdcxx_version 12 13 16) + if(HOST_GCC_VERSION AND + HOST_GCC_VERSION VERSION_LESS "${libstdcxx_version}") + list(APPEND gcc_only -X libstdcxx${libstdcxx_version}) + endif() + endforeach() + # `broken-libstdcxx16': known to fail with the libstdc++ 16 headers (a + # temporary exclusion; each such test has a KNOWNBUG for its root cause) + if(HOST_GCC_VERSION AND NOT HOST_GCC_VERSION VERSION_LESS "16") + list(APPEND gcc_only -X broken-libstdcxx16) + endif() +else() + list(APPEND gcc_only -X libstdcxx -X libstdcxx12 -X libstdcxx13 -X libstdcxx16) +endif() + +# On GCC < 13, system header processing leaves more incomplete template +# symbols that cause --validate-goto-model to crash. Run validation +# only on GCC 13+ where headers are well-supported. +if(CMAKE_CXX_COMPILER_ID STREQUAL "GNU" AND + CMAKE_CXX_COMPILER_VERSION VERSION_LESS "13") + set(cbmc_cmd "$") +else() + set(cbmc_cmd "$ --validate-goto-model --validate-ssa-equation") +endif() -add_test_pl_tests( - "$ --validate-goto-model --validate-ssa-equation" ${gcc_only} -) +# A per-test timeout (-t) so that a single hanging test fails with +# [TIMEOUT] and its name instead of exhausting the whole suite's TIMEOUT +# (the slowest passing test took 339 s on the macOS CI runner). +set(cbmc_cpp_test_timeout -t 900) + +# CORE as four shards that ctest runs in parallel: run serially, the suite +# exceeded the 4800 s TIMEOUT on the macOS CI runner (about 2900 s of +# passing tests there), with no single test at fault. +set(cbmc_cpp_flags ${gcc_only} -X libcxx ${cbmc_cpp_test_timeout}) +add_sharded_test_pl_profile( + "cbmc-cpp" "${cbmc_cmd}" "-C;${cbmc_cpp_flags}" CORE "cbmc-cpp" 4 4800) +add_test_pl_profile("cbmc-cpp" "${cbmc_cmd}" -T THOROUGH ${cbmc_cpp_flags}) +add_test_pl_profile("cbmc-cpp" "${cbmc_cmd}" -F FUTURE ${cbmc_cpp_flags}) +add_test_pl_profile("cbmc-cpp" "${cbmc_cmd}" -K KNOWNBUG ${cbmc_cpp_flags}) + +# libc++ tests run without --validate-goto-model because system header +# processing may leave missing symbols in the goto model. +# Only enable if clang and libc++ headers are available. +find_program(CLANG_FOUND clang) +find_path(LIBCXX_FOUND "vector" PATHS /usr/include/c++/v1 /usr/lib/llvm-18/include/c++/v1 NO_DEFAULT_PATH) +if(CLANG_FOUND AND LIBCXX_FOUND) + add_test_pl_profile( + "cbmc-cpp-libcxx" + "$" + -C CORE + -I libcxx + ${gcc_only} + ${cbmc_cpp_test_timeout} + ) + # ~15 minutes of libc++ header-heavy tests on the CI runners + set_tests_properties("cbmc-cpp-libcxx-CORE" PROPERTIES TIMEOUT 2400) +endif() diff --git a/regression/cbmc-cpp/Makefile b/regression/cbmc-cpp/Makefile index b08769d45514..68163c28a2a2 100644 --- a/regression/cbmc-cpp/Makefile +++ b/regression/cbmc-cpp/Makefile @@ -3,15 +3,58 @@ default: tests.log include ../../src/config.inc include ../../src/common +# `msvc-stl': tests of the MSVC STL, which needs cl's preprocessing ifeq ($(BUILD_ENV_),MSVC) - excluded_tests = -X gcc-only + excluded_tests = -X gcc-only -X gnu-extensions -X itanium-abi +else ifneq ($(shell ../../../src/goto-cc/goto-cc --version 2>&1 | grep -c 'gcc:'),0) + excluded_tests = -X msvc-stl +else + excluded_tests = -X gcc-only -X msvc-stl +endif + +# Tests tagged `libstdcxxNN' need the libstdc++ headers of GCC >= NN (cbmc +# preprocesses with the host gcc); exclude those the host cannot provide. +# `gcc' may be clang (macOS), whose standard library is libc++: then no test +# that needs the libstdc++ headers can run (`libstdcxx', `libstdcxxNN'). +# With MSVC, cbmc preprocesses with cl (the MSVC STL) whatever gcc is +# installed. +ifeq ($(BUILD_ENV_),MSVC) +host_gcc_major = +else ifeq ($(shell gcc --version 2>/dev/null | grep -c clang),0) +host_gcc_major = $(shell gcc -dumpversion 2>/dev/null | cut -d. -f1) +else +host_gcc_major = +endif +ifeq ($(shell test -n "$(host_gcc_major)" && test $(host_gcc_major) -ge 12 && echo yes),yes) + excluded_libstdcxx = +else + excluded_libstdcxx = -X libstdcxx12 +endif +ifeq ($(host_gcc_major),) + excluded_libstdcxx += -X libstdcxx +endif +ifneq ($(shell test -n "$(host_gcc_major)" && test $(host_gcc_major) -ge 13 && echo yes),yes) + excluded_libstdcxx += -X libstdcxx13 +endif +ifneq ($(shell test -n "$(host_gcc_major)" && test $(host_gcc_major) -ge 16 && echo yes),yes) + excluded_libstdcxx += -X libstdcxx16 +else + # known to fail with the libstdc++ 16 headers (temporary, see README) + excluded_libstdcxx += -X broken-libstdcxx16 +endif + +# Exclude libc++ tests when libc++ headers are not installed +ifeq ($(wildcard /usr/include/c++/v1/vector),) + ifeq ($(wildcard /Library/Developer/CommandLineTools/SDKs/*/usr/include/c++/v1/vector),) + excluded_libcxx = -X libcxx + endif endif test: - @../test.pl -e -p -c "../../../src/cbmc/cbmc --validate-goto-model --validate-ssa-equation" $(excluded_tests) + @../test.pl -e -p -c "../../../src/cbmc/cbmc --validate-goto-model --validate-ssa-equation" $(excluded_tests) $(excluded_libstdcxx) $(excluded_libcxx) -t 1800 tests.log: ../test.pl - @../test.pl -e -p -c "../../../src/cbmc/cbmc --validate-goto-model --validate-ssa-equation" $(excluded_tests) + @../test.pl -e -p -c "../../../src/cbmc/cbmc --validate-goto-model --validate-ssa-equation" $(excluded_tests) $(excluded_libstdcxx) $(excluded_libcxx) -t 1800 clean: find . -name '*.out' -execdir $(RM) '{}' \; diff --git a/regression/cpp/CMakeLists.txt b/regression/cpp/CMakeLists.txt index 2f9b458d43f7..d6ff703fb273 100644 --- a/regression/cpp/CMakeLists.txt +++ b/regression/cpp/CMakeLists.txt @@ -1,4 +1,5 @@ -if("${CMAKE_CXX_COMPILER_ID}" STREQUAL "MSVC") +if("${CMAKE_CXX_COMPILER_ID}" STREQUAL "MSVC" OR + NOT "${CMAKE_CXX_COMPILER_ID}" STREQUAL "GNU") set(gcc_only -X gcc-only) else() set(gcc_only "") diff --git a/regression/cpp/Makefile b/regression/cpp/Makefile index 708253aaceb9..35ff26f6036f 100644 --- a/regression/cpp/Makefile +++ b/regression/cpp/Makefile @@ -11,6 +11,10 @@ endif ifeq ($(BUILD_ENV_),MSVC) excluded_tests = -X gcc-only +else ifneq ($(shell $(exe) --version 2>&1 | grep -c gcc),0) + excluded_tests = +else + excluded_tests = -X gcc-only endif test: From 5c3eb7cb3b8c8ef4e79e79921fa068d36e4563f5 Mon Sep 17 00:00:00 2001 From: Michael Tautschnig Date: Tue, 10 Nov 2026 10:01:39 +0000 Subject: [PATCH 2/3] C++ front end tests: C++20 Tests of the C++ front end (322 test directories in regression/cbmc-cpp), as written for the reworked front end. Each ends with an assertion that must fail and requires `** 1 of N failed', so that a test that does not type-check fails. None of the 353 test descriptions passes with the current front end, so all are KNOWNBUG; they become CORE as the changes they test are merged. Tests that need particular headers or compilers carry the tags of regression/README.md. Co-authored-by: Kiro Depends-on: #9407 Depends-on: #9414 --- .../cpp20_abbreviated_fn_tmpl/main.cpp | 12 + .../cpp20_abbreviated_fn_tmpl/test.desc | 9 + .../main.cpp | 30 + .../test.desc | 18 + .../cpp20_adl_enum_poison_pill/main.cpp | 43 + .../cpp20_adl_enum_poison_pill/test.desc | 12 + .../cbmc-cpp/cpp20_aggregate_base/main.cpp | 16 + .../cbmc-cpp/cpp20_aggregate_base/test.desc | 10 + .../main.cpp | 32 + .../test.desc | 21 + .../cpp20_aggregate_paren_init/main.cpp | 13 + .../cpp20_aggregate_paren_init/test.desc | 9 + .../main.cpp | 21 + .../test.desc | 11 + .../cbmc-cpp/cpp20_algorithm_basic/main.cpp | 8 + .../cbmc-cpp/cpp20_algorithm_basic/test.desc | 14 + .../cpp20_algorithm_basic/test_libcxx.desc | 13 + .../cpp20_algorithm_basic_libcxx/main.cpp | 8 + .../cpp20_algorithm_basic_libcxx/test.desc | 11 + .../main.cpp | 58 + .../test.desc | 19 + .../cpp20_anon_union_class_variant/main.cpp | 37 + .../cpp20_anon_union_class_variant/test.desc | 13 + .../cpp20_anon_union_variant_meminit/main.cpp | 33 + .../test.desc | 21 + .../cpp20_apple_libcxx_basic/main.cpp | 27 + .../cpp20_apple_libcxx_basic/test.desc | 22 + .../cbmc-cpp/cpp20_array_basic/main.cpp | 7 + .../cbmc-cpp/cpp20_array_basic/test.desc | 9 + .../main.cpp | 29 + .../test.desc | 22 + .../main.cpp | 37 + .../test.desc | 15 + .../main.cpp | 60 + .../test.desc | 28 + regression/cbmc-cpp/cpp20_bit_cast/main.cpp | 16 + regression/cbmc-cpp/cpp20_bit_cast/test.desc | 9 + .../cpp20_bitfield_default_init/main.cpp | 15 + .../cpp20_bitfield_default_init/test.desc | 10 + .../cbmc-cpp/cpp20_bodyless_std_move/main.cpp | 39 + .../cpp20_bodyless_std_move/test.desc | 12 + .../cpp20_builtin_bit_cast_msvc/main.ii | 23 + .../cpp20_builtin_bit_cast_msvc/test.desc | 17 + .../dependent.cpp | 21 + .../function_type.cpp | 10 + .../main.cpp | 17 + .../test.desc | 29 + .../test_dependent.desc | 14 + .../test_function_type.desc | 17 + .../main.cpp | 89 + .../test.desc | 14 + .../main.cpp | 36 + .../test.desc | 15 + .../main.cpp | 57 + .../test.desc | 15 + .../main.cpp | 2111 +++++++++++++++++ .../test.desc | 16 + .../main.cpp | 100 + .../test.desc | 21 + .../cpp20_char8_t_distinct_type/main.cpp | 41 + .../cpp20_char8_t_distinct_type/test.desc | 26 + regression/cbmc-cpp/cpp20_char8t/main.cpp | 7 + regression/cbmc-cpp/cpp20_char8t/test.desc | 10 + .../cbmc-cpp/cpp20_class_nttp_brace/main.cpp | 18 + .../cbmc-cpp/cpp20_class_nttp_brace/test.desc | 16 + .../cpp20_class_nttp_constexpr_ctor/main.cpp | 57 + .../cpp20_class_nttp_constexpr_ctor/test.desc | 19 + .../main.cpp | 38 + .../test.desc | 14 + .../main.cpp | 31 + .../test.desc | 24 + .../main.cpp | 23 + .../test.desc | 16 + .../cbmc-cpp/cpp20_compare_header/main.cpp | 14 + .../cbmc-cpp/cpp20_compare_header/test.desc | 10 + .../main.cpp | 23 + .../test.desc | 38 + .../main.cpp | 41 + .../test.desc | 16 + .../main.cpp | 51 + .../test.desc | 62 + .../main.cpp | 94 + .../test.desc | 19 + .../cbmc-cpp/cpp20_concept_as_bool/main.cpp | 27 + .../cbmc-cpp/cpp20_concept_as_bool/test.desc | 9 + .../cpp20_concept_compound_req_eval/main.cpp | 35 + .../cpp20_concept_compound_req_eval/test.desc | 11 + .../main.cpp | 25 + .../test.desc | 19 + .../main.cpp | 47 + .../test.desc | 19 + .../cpp20_concept_constrained_auto/main.cpp | 15 + .../cpp20_concept_constrained_auto/test.desc | 9 + .../test_libcxx.desc | 9 + .../cpp20_concept_constrained_param/main.cpp | 46 + .../cpp20_concept_constrained_param/test.desc | 9 + .../main.cpp | 28 + .../test.desc | 33 + .../cpp20_concept_expression/main.cpp | 22 + .../cpp20_concept_expression/test.desc | 10 + .../main.cpp | 41 + .../test.desc | 13 + .../cpp20_concept_iterator_chain/main.cpp | 118 + .../cpp20_concept_iterator_chain/test.desc | 33 + .../cpp20_concept_nested_req/main.cpp | 36 + .../cpp20_concept_nested_req/test.desc | 9 + .../main.cpp | 49 + .../test.desc | 20 + .../main.cpp | 37 + .../test.desc | 19 + .../cpp20_concept_requires_eval/main.cpp | 43 + .../cpp20_concept_requires_eval/test.desc | 21 + .../cbmc-cpp/cpp20_concept_shorthand/main.cpp | 18 + .../cpp20_concept_shorthand/test.desc | 9 + .../cpp20_concept_simple_req/main.cpp | 28 + .../cpp20_concept_simple_req/test.desc | 11 + .../cpp20_concept_subsumption/main.cpp | 26 + .../cpp20_concept_subsumption/test.desc | 9 + .../test_libcxx.desc | 9 + .../cbmc-cpp/cpp20_concept_type_req/main.cpp | 28 + .../cbmc-cpp/cpp20_concept_type_req/test.desc | 9 + .../cbmc-cpp/cpp20_concept_verify/main.cpp | 16 + .../cbmc-cpp/cpp20_concept_verify/test.desc | 10 + regression/cbmc-cpp/cpp20_concepts/main.cpp | 16 + regression/cbmc-cpp/cpp20_concepts/test.desc | 10 + .../cbmc-cpp/cpp20_concepts_basic/main.cpp | 35 + .../cbmc-cpp/cpp20_concepts_basic/test.desc | 11 + .../cpp20_concepts_compound_req/main.cpp | 44 + .../cpp20_concepts_compound_req/test.desc | 9 + .../cpp20_concepts_constrained_param/main.cpp | 23 + .../test.desc | 11 + .../cbmc-cpp/cpp20_concepts_named/main.cpp | 27 + .../cbmc-cpp/cpp20_concepts_named/test.desc | 16 + .../cpp20_concepts_nested_req/main.cpp | 25 + .../cpp20_concepts_nested_req/test.desc | 9 + .../cbmc-cpp/cpp20_concepts_ordering/main.cpp | 32 + .../cpp20_concepts_ordering/test.desc | 9 + .../cpp20_concepts_ordering_gcc14/main.cpp | 29 + .../cpp20_concepts_ordering_gcc14/test.desc | 16 + .../cbmc-cpp/cpp20_concepts_overload/main.cpp | 26 + .../cpp20_concepts_overload/test.desc | 13 + .../cpp20_concepts_requires_expr/main.cpp | 18 + .../cpp20_concepts_requires_expr/test.desc | 17 + .../cpp20_concepts_requires_type/main.cpp | 47 + .../cpp20_concepts_requires_type/test.desc | 18 + .../cpp20_concepts_subsumption/main.cpp | 33 + .../cpp20_concepts_subsumption/test.desc | 9 + .../main.cpp | 30 + .../test.desc | 15 + .../main.cpp | 78 + .../test.desc | 21 + regression/cbmc-cpp/cpp20_consteval/main.cpp | 10 + regression/cbmc-cpp/cpp20_consteval/test.desc | 10 + .../cbmc-cpp/cpp20_consteval_verify/main.cpp | 11 + 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+ .../test_defaulted_parameter.desc | 17 + .../main.cpp | 23 + .../test.desc | 30 + .../test_unsatisfied.desc | 17 + .../unsatisfied.cpp | 32 + .../main.cpp | 82 + .../test.desc | 18 + .../main.cpp | 51 + .../test.desc | 16 + .../main.cpp | 55 + .../test.desc | 21 + .../main.cpp | 35 + .../test.desc | 24 + .../main.cpp | 34 + .../test.desc | 26 + .../main.cpp | 50 + .../test.desc | 15 + .../main.cpp | 51 + .../test.desc | 26 + .../main.cpp | 44 + .../test.desc | 21 + .../main.cpp | 56 + .../test.desc | 31 + .../main.cpp | 36 + .../test.desc | 17 + .../main.cpp | 48 + .../test.desc | 27 + .../main.cpp | 74 + .../test.desc | 30 + .../main.cpp | 67 + .../test.desc | 18 + .../main.cpp | 66 + .../test.desc | 21 + .../cpp20_coroutine_co_return/main.cpp | 41 + .../cpp20_coroutine_co_return/test.desc | 16 + .../main.cpp | 53 + .../test.desc | 37 + .../cbmc-cpp/cpp20_coroutine_header/main.cpp | 12 + .../cbmc-cpp/cpp20_coroutine_header/test.desc | 9 + .../cbmc-cpp/cpp20_coroutine_types/main.cpp 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b/regression/cbmc-cpp/cpp20_abbreviated_fn_tmpl/main.cpp @@ -0,0 +1,12 @@ +// C++20 abbreviated function template +int add(auto a, auto b) +{ + return a + b; +} + +int main() +{ + int r = add(1, 2); + __CPROVER_assert(r == 3, "abbreviated fn tmpl"); + return 0; +} diff --git a/regression/cbmc-cpp/cpp20_abbreviated_fn_tmpl/test.desc b/regression/cbmc-cpp/cpp20_abbreviated_fn_tmpl/test.desc new file mode 100644 index 000000000000..364d916d224e --- /dev/null +++ b/regression/cbmc-cpp/cpp20_abbreviated_fn_tmpl/test.desc @@ -0,0 +1,9 @@ +KNOWNBUG +main.cpp +--cpp20 +^VERIFICATION SUCCESSFUL$ +^EXIT=0$ +^SIGNAL=0$ +-- +dropped the body +-- diff --git a/regression/cbmc-cpp/cpp20_abbreviated_function_template_constructor/main.cpp b/regression/cbmc-cpp/cpp20_abbreviated_function_template_constructor/main.cpp new file mode 100644 index 000000000000..a980761144c2 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_abbreviated_function_template_constructor/main.cpp @@ -0,0 +1,30 @@ +extern "C" void __CPROVER_assert(bool, const char *); +template +struct sub +{ + It b; + Sent e; + // N5008 [dcl.fct]/20: an abbreviated function template constructor; + // {first, last} initializes the parameter sub&& through it + // ([dcl.init.list]/3.7, [over.ics.list]) + sub(auto first, Sent last) : b(first), e(last) + { + } +}; +template +struct view +{ + V base; + view(V &&v) : base(static_cast(v)) + { + } +}; +int main() +{ + const char s[] = "ab"; + const char *first = s, *last = s + 2; + view> v({first, last}); + __CPROVER_assert(v.base.e - v.base.b == 2, "braced argument"); + __CPROVER_assert(v.base.e == v.base.b, "WRONG (must FAIL)"); + return 0; +} diff --git a/regression/cbmc-cpp/cpp20_abbreviated_function_template_constructor/test.desc b/regression/cbmc-cpp/cpp20_abbreviated_function_template_constructor/test.desc new file mode 100644 index 000000000000..42870d9a7605 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_abbreviated_function_template_constructor/test.desc @@ -0,0 +1,18 @@ +KNOWNBUG +main.cpp +--cpp20 +^\[main\.assertion\.1\] line \d+ braced argument: SUCCESS$ +^\[main\.assertion\.2\] line \d+ WRONG \(must FAIL\): FAILURE$ +^VERIFICATION FAILED$ +^EXIT=10$ +^SIGNAL=0$ +-- +^warning: ignoring +^CONVERSION ERROR$ +-- +An abbreviated function template was recognized only at namespace scope; +a member with a placeholder parameter (subrange(auto __first, _Sent +__last) in ) kept an `auto' parameter type and was no candidate. +GCC 14's _M_parse_fill_and_align (`_Utf32_view> +__uv({__first, __last})') lost its body once __literal_encoding_is_unicode +was evaluated. diff --git a/regression/cbmc-cpp/cpp20_adl_enum_poison_pill/main.cpp b/regression/cbmc-cpp/cpp20_adl_enum_poison_pill/main.cpp new file mode 100644 index 000000000000..ea654c16830c --- /dev/null +++ b/regression/cbmc-cpp/cpp20_adl_enum_poison_pill/main.cpp @@ -0,0 +1,43 @@ +// N5008 [basic.lookup.argdep]/3.3, 4: the associated entities of an +// ENUMERATION type include its innermost enclosing namespace. CBMC's +// ADL only associated CLASS types, so libc++'s poison-pill pattern -- +// using __adl_only::make_error_code; // deleted +// *this = make_error_code(__e); // real overload via ADL +// (std::error_code's converting constructor over io_errc/future_errc) +// found only the deleted pill and the whole chain +// failed "found no match for symbol 'make_error_code'". +extern "C" void __CPROVER_assert(bool, const char *); +namespace std +{ +namespace __adl_only +{ +void make_error_code() = delete; +} +struct error_code +{ + int v; + template + error_code(E e) + { + using __adl_only::make_error_code; + *this = make_error_code(e); + } + error_code(int val, bool) : v(val) + { + } +}; +} // namespace std +enum class io_errc +{ + stream = 1 +}; +std::error_code make_error_code(io_errc e) +{ + return std::error_code(static_cast(e), true); +} +int main() +{ + std::error_code ec(io_errc::stream); + __CPROVER_assert(ec.v == 1, "adl make_error_code"); + return 0; +} diff --git a/regression/cbmc-cpp/cpp20_adl_enum_poison_pill/test.desc b/regression/cbmc-cpp/cpp20_adl_enum_poison_pill/test.desc new file mode 100644 index 000000000000..ce4fd1d535ea --- /dev/null +++ b/regression/cbmc-cpp/cpp20_adl_enum_poison_pill/test.desc @@ -0,0 +1,12 @@ +KNOWNBUG +main.cpp +--cpp20 +^\[main\.assertion\.1\] line \d+ adl make_error_code: SUCCESS$ +^VERIFICATION SUCCESSFUL$ +^EXIT=0$ +^SIGNAL=0$ +-- +dropped the body +-- +Fixed 2026-08-04 (round 12): resolve_with_arguments associates the +innermost enclosing namespace of enum-typed arguments. diff --git a/regression/cbmc-cpp/cpp20_aggregate_base/main.cpp b/regression/cbmc-cpp/cpp20_aggregate_base/main.cpp new file mode 100644 index 000000000000..560b5bc5dc66 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_aggregate_base/main.cpp @@ -0,0 +1,16 @@ +// C++20 aggregate initialization with base class +struct Base +{ + int x; +}; +struct Derived : Base +{ + int y; +}; +int main() +{ + Derived d{{10}, 20}; + __CPROVER_assert(d.x == 10, "base member"); + __CPROVER_assert(d.y == 20, "derived member"); + return 0; +} diff --git a/regression/cbmc-cpp/cpp20_aggregate_base/test.desc b/regression/cbmc-cpp/cpp20_aggregate_base/test.desc new file mode 100644 index 000000000000..4925148000ec --- /dev/null +++ b/regression/cbmc-cpp/cpp20_aggregate_base/test.desc @@ -0,0 +1,10 @@ +KNOWNBUG +main.cpp +--cpp20 +^VERIFICATION SUCCESSFUL$ +^EXIT=0$ +^SIGNAL=0$ +-- +dropped the body +-- +C++20 aggregate initialization with base class diff --git a/regression/cbmc-cpp/cpp20_aggregate_element_of_class_type_constructed/main.cpp b/regression/cbmc-cpp/cpp20_aggregate_element_of_class_type_constructed/main.cpp new file mode 100644 index 000000000000..257d518f6b9e --- /dev/null +++ b/regression/cbmc-cpp/cpp20_aggregate_element_of_class_type_constructed/main.cpp @@ -0,0 +1,32 @@ +// N5008 [dcl.init.aggr]/4.3: each element of an aggregate is +// copy-initialized from its initializer; an element of class type is +// constructed, not assigned to +extern "C" void __CPROVER_assert(bool, const char *); +struct conv +{ + int v; + conv(int x) : v(2 * x) + { + } + conv &operator=(const conv &) = delete; +}; +struct agg +{ + conv c; + int k; +}; +template +struct leaf +{ + H value; +}; +int main() +{ + agg a(3, 4); + __CPROVER_assert(a.c.v == 6 && a.k == 4, "parenthesized"); + leaf l(5); + __CPROVER_assert(l.value.v == 10, "one element"); + agg b{7, 1}; + __CPROVER_assert(b.c.v == 14, "braced"); + __CPROVER_assert(a.c.v == 3, "WRONG (must FAIL)"); +} diff --git a/regression/cbmc-cpp/cpp20_aggregate_element_of_class_type_constructed/test.desc b/regression/cbmc-cpp/cpp20_aggregate_element_of_class_type_constructed/test.desc new file mode 100644 index 000000000000..669a9979bd3f --- /dev/null +++ b/regression/cbmc-cpp/cpp20_aggregate_element_of_class_type_constructed/test.desc @@ -0,0 +1,21 @@ +KNOWNBUG +main.cpp +--cpp20 +^\[main\.assertion\.1\] line \d+ parenthesized: SUCCESS$ +^\[main\.assertion\.2\] line \d+ one element: SUCCESS$ +^\[main\.assertion\.3\] line \d+ braced: SUCCESS$ +^\[main\.assertion\.4\] line \d+ WRONG \(must FAIL\): FAILURE$ +^VERIFICATION FAILED$ +^EXIT=10$ +^SIGNAL=0$ +-- +^warning: ignoring +^CONVERSION ERROR$ +-- +N5008 [dcl.init.aggr]/4.3, [dcl.init.general]/16.6.2.2 (C++20): the +elements of `agg a(3, 4)' are copy-initialized; the element of class type +`conv' is constructed from 3. The parenthesized aggregate initialization +assigned to the member instead (operator= of a converted temporary, +"member 'conv::operator=' is not accessible" for the deleted one, bin53). +Found from libc++'s __tuple_leaf (tuple:469). g++ 13 and clang++ 18 +accept this program, and it fails only its WRONG assertion. diff --git a/regression/cbmc-cpp/cpp20_aggregate_paren_init/main.cpp b/regression/cbmc-cpp/cpp20_aggregate_paren_init/main.cpp new file mode 100644 index 000000000000..93050efe225d --- /dev/null +++ b/regression/cbmc-cpp/cpp20_aggregate_paren_init/main.cpp @@ -0,0 +1,13 @@ +// C++20 aggregate initialization with parentheses +struct S +{ + int x; + int y; +}; + +int main() +{ + S s(1, 2); + __CPROVER_assert(s.x == 1 && s.y == 2, "aggregate paren init"); + return 0; +} diff --git a/regression/cbmc-cpp/cpp20_aggregate_paren_init/test.desc b/regression/cbmc-cpp/cpp20_aggregate_paren_init/test.desc new file mode 100644 index 000000000000..364d916d224e --- /dev/null +++ b/regression/cbmc-cpp/cpp20_aggregate_paren_init/test.desc @@ -0,0 +1,9 @@ +KNOWNBUG +main.cpp +--cpp20 +^VERIFICATION SUCCESSFUL$ +^EXIT=0$ +^SIGNAL=0$ +-- +dropped the body +-- diff --git a/regression/cbmc-cpp/cpp20_aggregate_reference_member_paren_init/main.cpp b/regression/cbmc-cpp/cpp20_aggregate_reference_member_paren_init/main.cpp new file mode 100644 index 000000000000..c4157b5267fe --- /dev/null +++ b/regression/cbmc-cpp/cpp20_aggregate_reference_member_paren_init/main.cpp @@ -0,0 +1,21 @@ +// N5008 [dcl.init.general]/16.6.2.2 (C++20 parenthesized aggregate +// initialization) + [dcl.init.aggr]/4.3 + [dcl.init.ref]: an aggregate +// whose element is a REFERENCE is initializable with (...) as with {...}, +// and the reference element is BOUND to its initializer. CBMC treated +// the reference member as making the class non-POD and fell through to +// constructor resolution, which found only the synthesized copy +// constructor and dropped main. +extern "C" void __CPROVER_assert(bool, const char *); +struct ref_holder +{ + int &r_; +}; +int main() +{ + int x = 7; + ref_holder h{x}; + __CPROVER_assert(h.r_ == 7, "reference member braced init"); + ref_holder g(x); + __CPROVER_assert(g.r_ == 7, "reference member paren init"); + return 0; +} diff --git a/regression/cbmc-cpp/cpp20_aggregate_reference_member_paren_init/test.desc b/regression/cbmc-cpp/cpp20_aggregate_reference_member_paren_init/test.desc new file mode 100644 index 000000000000..33f1e8d90ef5 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_aggregate_reference_member_paren_init/test.desc @@ -0,0 +1,11 @@ +KNOWNBUG +main.cpp +--cpp20 +^\[main\.assertion\.1\] line \d+ reference member braced init: SUCCESS$ +^\[main\.assertion\.2\] line \d+ reference member paren init: SUCCESS$ +^VERIFICATION SUCCESSFUL$ +^EXIT=0$ +^SIGNAL=0$ +-- +dropped the body +-- diff --git a/regression/cbmc-cpp/cpp20_algorithm_basic/main.cpp b/regression/cbmc-cpp/cpp20_algorithm_basic/main.cpp new file mode 100644 index 000000000000..4f03861f5353 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_algorithm_basic/main.cpp @@ -0,0 +1,8 @@ +// C++20 header +#include +int main() +{ + int arr[] = {3, 1, 4, 1, 5}; + std::sort(arr, arr + 5); + __CPROVER_assert(arr[0] == 1, "sorted"); +} diff --git a/regression/cbmc-cpp/cpp20_algorithm_basic/test.desc b/regression/cbmc-cpp/cpp20_algorithm_basic/test.desc new file mode 100644 index 000000000000..81ae6ff6de24 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_algorithm_basic/test.desc @@ -0,0 +1,14 @@ +KNOWNBUG +main.cpp +--cpp17 --unwind 6 --no-unwinding-assertions +^VERIFICATION SUCCESSFUL$ +^EXIT=0$ +^SIGNAL=0$ +-- +^CONVERSION ERROR$ +^PARSING ERROR$ +dropped the body +-- +std::sort in C++17 mode. May report "no body" on some GCC versions. +--unwind 6 (was 3) and no --depth: every path was cut before the end of +main. diff --git a/regression/cbmc-cpp/cpp20_algorithm_basic/test_libcxx.desc b/regression/cbmc-cpp/cpp20_algorithm_basic/test_libcxx.desc new file mode 100644 index 000000000000..39abdd7b9c99 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_algorithm_basic/test_libcxx.desc @@ -0,0 +1,13 @@ +KNOWNBUG libcxx libcxx-slow +main.cpp +--cpp17 --stdlib libc++ +^VERIFICATION +^EXIT=(0|10)$ +^SIGNAL=0$ +-- +^CONVERSION ERROR$ +^PARSING ERROR$ +-- +libc++ ratio/chrono headers contain intentional UB in static const +initializers (1LL << 63, division by zero in GCD) that CBMC flags +as runtime errors. These are compile-time-only computations. diff --git a/regression/cbmc-cpp/cpp20_algorithm_basic_libcxx/main.cpp b/regression/cbmc-cpp/cpp20_algorithm_basic_libcxx/main.cpp new file mode 100644 index 000000000000..4f03861f5353 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_algorithm_basic_libcxx/main.cpp @@ -0,0 +1,8 @@ +// C++20 header +#include +int main() +{ + int arr[] = {3, 1, 4, 1, 5}; + std::sort(arr, arr + 5); + __CPROVER_assert(arr[0] == 1, "sorted"); +} diff --git a/regression/cbmc-cpp/cpp20_algorithm_basic_libcxx/test.desc b/regression/cbmc-cpp/cpp20_algorithm_basic_libcxx/test.desc new file mode 100644 index 000000000000..169aef6852c8 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_algorithm_basic_libcxx/test.desc @@ -0,0 +1,11 @@ +KNOWNBUG libcxx +main.cpp + +^VERIFICATION +^EXIT=(0|10)$ +^SIGNAL=0$ +-- +^PARSING ERROR$ +^CONVERSION ERROR$ +dropped the body +-- diff --git a/regression/cbmc-cpp/cpp20_alias_and_variable_template_instances_reused/main.cpp b/regression/cbmc-cpp/cpp20_alias_and_variable_template_instances_reused/main.cpp new file mode 100644 index 000000000000..7b5659da4ae1 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_alias_and_variable_template_instances_reused/main.cpp @@ -0,0 +1,58 @@ +// N5008 [temp.alias]/2, [temp.concept], [temp.variable]: a specialization +// of an alias template, a concept or a variable template is determined by +// its template arguments; CBMC reuses an instance made before. The same +// specializations are named many times here, also after a substitution +// failure for other arguments (which makes no instance and is not cached), +// and in different scopes. +extern "C" void __CPROVER_assert(bool, const char *); +template +struct enable_if +{ +}; +template +struct enable_if +{ + using type = T; +}; +template +using enable_if_t = typename enable_if::type; +template +constexpr bool is_int_like = false; +template <> +constexpr bool is_int_like = true; +template <> +constexpr bool is_int_like = true; +template +concept integral = is_int_like; +template +constexpr int width_v = sizeof(T) * 8; +template >> +constexpr int f(T) +{ + return 1; +} +constexpr int f(...) +{ + return 2; +} +namespace inner +{ +template +using same = enable_if_t, T>; +constexpr int g(same x) +{ + return x + width_v; +} +} // namespace inner +int main() +{ + static_assert(f(1) == 1 && f(2) == 1); + static_assert(integral && !integral && integral); + static_assert(width_v == 32 && width_v == 8 && width_v == 32); + __CPROVER_assert( + f(1) + f(1.0) + f(3L) + f(4.0f) == 6 && inner::g(1) == 33 && + width_v == 16, + "reused instances"); + __CPROVER_assert(false, "WRONG (must FAIL)"); + return 0; +} diff --git a/regression/cbmc-cpp/cpp20_alias_and_variable_template_instances_reused/test.desc b/regression/cbmc-cpp/cpp20_alias_and_variable_template_instances_reused/test.desc new file mode 100644 index 000000000000..4a8e6a36497b --- /dev/null +++ b/regression/cbmc-cpp/cpp20_alias_and_variable_template_instances_reused/test.desc @@ -0,0 +1,19 @@ +KNOWNBUG +main.cpp +--cpp20 +^\[main\.assertion\.1\] line \d+ reused instances: SUCCESS$ +^\[main\.assertion\.2\] line \d+ WRONG \(must FAIL\): FAILURE$ +^\*\* 1 of \d+ failed +^VERIFICATION FAILED$ +^EXIT=10$ +^SIGNAL=0$ +-- +^warning: ignoring +^CONVERSION ERROR$ +static_assert condition could not be evaluated +-- +CBMC re-instantiated an alias, concept or variable template specialization +at each use; it now reuses the instance (25% less type-checking time for +std::print). A guard: the reused instances give the same results, also +after substitution failures and from another scope. (f(1.0) is checked at +run time only: CBMC does not evaluate it in a constant expression.) diff --git a/regression/cbmc-cpp/cpp20_anon_union_class_variant/main.cpp b/regression/cbmc-cpp/cpp20_anon_union_class_variant/main.cpp new file mode 100644 index 000000000000..9bd4beb6eb21 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_anon_union_class_variant/main.cpp @@ -0,0 +1,37 @@ +// N5008 [class.union.anon]/1: an anonymous union must not have member +// functions or static data members -- but its variant members MAY be +// of class type with bases and constructors (POD-ness is not +// required). CBMC's POD gate rejected the enclosing class and every +// use of the variant members failed with "symbol '__null_state_' is +// unknown" (libc++'s __optional_destruct_base, the root of +// std::map's CONVERSION ERROR). cvise-reduced from a preprocessed +// TU; g++/clang++ accept and run clean. +extern "C" void __CPROVER_assert(bool, const char *); + +struct __non_trivial_if +{ +}; +struct allocator : __non_trivial_if +{ +}; + +template +struct __optional_destruct_base +{ + union + { + char __null_state_; + allocator __val_; + }; + __optional_destruct_base() : __null_state_() + { + } +}; + +__optional_destruct_base g; + +int main() +{ + g.__null_state_ = 3; + __CPROVER_assert(g.__null_state_ == 3, "variant member accessible"); +} diff --git a/regression/cbmc-cpp/cpp20_anon_union_class_variant/test.desc b/regression/cbmc-cpp/cpp20_anon_union_class_variant/test.desc new file mode 100644 index 000000000000..48dc37fc8f3c --- /dev/null +++ b/regression/cbmc-cpp/cpp20_anon_union_class_variant/test.desc @@ -0,0 +1,13 @@ +KNOWNBUG +main.cpp +--cpp20 +^\[main\.assertion\.1\] line \d+ variant member accessible: SUCCESS$ +^VERIFICATION SUCCESSFUL$ +^EXIT=0$ +^SIGNAL=0$ +-- +dropped the body +-- +Anonymous union with a class-type variant member (with a base): +the class builds, the variant member is visible and assignable +([class.union.anon]/1 -- POD-ness not required). diff --git a/regression/cbmc-cpp/cpp20_anon_union_variant_meminit/main.cpp b/regression/cbmc-cpp/cpp20_anon_union_variant_meminit/main.cpp new file mode 100644 index 000000000000..5f1016fd2491 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_anon_union_variant_meminit/main.cpp @@ -0,0 +1,33 @@ +// The next layer above cpp20_anon_union_class_variant: a constructor +// mem-initializer NAMING a variant member of the anonymous union +// ([class.base.init]/2 -- any member of the class, including members +// of anonymous-union members) is silently DROPPED: the constructor +// converts to an empty body and __null_state_ stays nondeterministic. +// g++/clang++ accept and verify at runtime. +extern "C" void __CPROVER_assert(bool, const char *); + +struct __non_trivial_if +{ +}; +struct allocator : __non_trivial_if +{ +}; + +template +struct __optional_destruct_base +{ + union + { + char __null_state_; + allocator __val_; + }; + __optional_destruct_base() : __null_state_() + { + } +}; + +int main() +{ + __optional_destruct_base b; + __CPROVER_assert(b.__null_state_ == 0, "variant member value-initialized"); +} diff --git a/regression/cbmc-cpp/cpp20_anon_union_variant_meminit/test.desc b/regression/cbmc-cpp/cpp20_anon_union_variant_meminit/test.desc new file mode 100644 index 000000000000..d112fdf79105 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_anon_union_variant_meminit/test.desc @@ -0,0 +1,21 @@ +KNOWNBUG +main.cpp +--cpp20 +^\[main\.assertion\.1\] line \d+ variant member value-initialized: SUCCESS$ +^VERIFICATION SUCCESSFUL$ +^EXIT=0$ +^SIGNAL=0$ +-- +dropped the body +-- +A mem-initializer naming an anonymous-union variant member +(`: __null_state_()`, [class.base.init]/2) is silently dropped from +the constructor (empty body; the member stays nondet). +check_member_initializers recognises the name (has_component_rec) and +full_member_initialization routes it, but the conversion loses it. +Blocks precise modelling of libc++ __optional_destruct_base +(cpp20_map_basic_libcxx's next layers). +Fixed 2026-08-03: the parser marks explicit empty initializers +("#value_init") and the anonymous-member path zero-initializes them +([dcl.init.general]/9); synthesized default-initialization entries +keep their indeterminate-value skip. diff --git a/regression/cbmc-cpp/cpp20_apple_libcxx_basic/main.cpp b/regression/cbmc-cpp/cpp20_apple_libcxx_basic/main.cpp new file mode 100644 index 000000000000..12537b1a61dc --- /dev/null +++ b/regression/cbmc-cpp/cpp20_apple_libcxx_basic/main.cpp @@ -0,0 +1,27 @@ +// C++20 optional features require GCC 10+ +#if !defined(__GNUC__) && !defined(_MSC_VER) || __GNUC__ >= 10 +// Test that basic STL headers work with system libc++ (Apple or LLVM). +// This exercises _Float16 handling, __decay builtin, and error recovery +// for parameter type mismatches in libc++ internals. +# include +# include +# include + +int main() +{ + std::vector v; + v.push_back(42); + __CPROVER_assert(v.size() == 1, "vector size"); + + std::string s = "hello"; + __CPROVER_assert(s.size() == 5, "string size"); + + std::optional o = 7; + __CPROVER_assert(o.has_value(), "optional has value"); +} + +#else +int main() +{ +} +#endif diff --git a/regression/cbmc-cpp/cpp20_apple_libcxx_basic/test.desc b/regression/cbmc-cpp/cpp20_apple_libcxx_basic/test.desc new file mode 100644 index 000000000000..88a570a29aa9 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_apple_libcxx_basic/test.desc @@ -0,0 +1,22 @@ +KNOWNBUG +main.cpp +--cpp20 +^VERIFICATION SUCCESSFUL$ +^EXIT=0$ +^SIGNAL=0$ +-- +^PARSING ERROR$ +^CONVERSION ERROR$ +^.*is unknown.*$ +dropped the body +-- +Basic STL headers (, , ) with system libc++. + +History: passed vacuously pre-conformance (truncated containers, havoc'd +operations); reclassified KNOWNBUG when the member-typedef conformance fix +([temp.inst]/2, [dcl.typedef]) made symex execute the real containers, +which then did not complete within resources. Re-flipped to CORE by the +[class.mem.general]/9 complete-class static-member-initializer fix: in-class +initializers reading class-local typedefs/siblings now resolve instead of +degrading to nondet, and verification completes in ~16s. +See doc/architectural/cpp-class-template-instantiation-plan.md. diff --git a/regression/cbmc-cpp/cpp20_array_basic/main.cpp b/regression/cbmc-cpp/cpp20_array_basic/main.cpp new file mode 100644 index 000000000000..11660323d929 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_array_basic/main.cpp @@ -0,0 +1,7 @@ +// C++20 std::array (works in C++17 but fails in C++20) +#include +int main() +{ + std::array a = {1, 2, 3}; + __CPROVER_assert(a[1] == 2, "array element"); +} diff --git a/regression/cbmc-cpp/cpp20_array_basic/test.desc b/regression/cbmc-cpp/cpp20_array_basic/test.desc new file mode 100644 index 000000000000..364d916d224e --- /dev/null +++ b/regression/cbmc-cpp/cpp20_array_basic/test.desc @@ -0,0 +1,9 @@ +KNOWNBUG +main.cpp +--cpp20 +^VERIFICATION SUCCESSFUL$ +^EXIT=0$ +^SIGNAL=0$ +-- +dropped the body +-- diff --git a/regression/cbmc-cpp/cpp20_array_new_parenthesized_initializer/main.cpp b/regression/cbmc-cpp/cpp20_array_new_parenthesized_initializer/main.cpp new file mode 100644 index 000000000000..cdc975da15f4 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_array_new_parenthesized_initializer/main.cpp @@ -0,0 +1,29 @@ +// N5008 [expr.new]/24, [dcl.init.general]/16.5: `new T[n](e1, ..., ek)' +// copy-initializes the first k elements from the expression-list and +// value-initializes the rest +extern "C" void __CPROVER_assert(bool, const char *); +struct C +{ + int v; + C() : v(7) + { + } + C(int x) : v(x) + { + } +}; +struct P +{ + int x; + int y; +}; +int main() +{ + int *a = new int[3](1, 2); + __CPROVER_assert(a[0] == 1 && a[1] == 2 && a[2] == 0, "parenthesized"); + C *c = new C[3](5); + __CPROVER_assert(c[0].v == 5 && c[1].v == 7 && c[2].v == 7, "class"); + P *p = new P[2](P{1, 2}); + __CPROVER_assert(p[0].y == 2 && p[1].x == 0, "aggregate"); + __CPROVER_assert(a[2] == 1, "WRONG (must FAIL)"); +} diff --git a/regression/cbmc-cpp/cpp20_array_new_parenthesized_initializer/test.desc b/regression/cbmc-cpp/cpp20_array_new_parenthesized_initializer/test.desc new file mode 100644 index 000000000000..2ebd3f9e6323 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_array_new_parenthesized_initializer/test.desc @@ -0,0 +1,22 @@ +KNOWNBUG +main.cpp +--cpp20 +^\[main\.assertion\.1\] line \d+ parenthesized: SUCCESS$ +^\[main\.assertion\.2\] line \d+ class: SUCCESS$ +^\[main\.assertion\.3\] line \d+ aggregate: SUCCESS$ +^\[main\.assertion\.4\] line \d+ WRONG \(must FAIL\): FAILURE$ +^VERIFICATION FAILED$ +^EXIT=10$ +^SIGNAL=0$ +-- +^warning: ignoring +^CONVERSION ERROR$ +-- +N5008 [expr.new]/24, [dcl.init.general]/16.5 (P0960, C++20): `new +int[3](1, 2)' initializes the elements from the parenthesized +expression-list as from a braced list (narrowing conversions aside): 1, +2, 0. The front end reported it as unsupported (bin53 crashed); it now +takes the path of `new T[n]{...}' +(cpp11_array_new_value_and_list_initialization), and before C++20 +reports that C++20 is required. g++ 13 and clang++ 18 accept this +program, and it fails only its WRONG assertion. diff --git a/regression/cbmc-cpp/cpp20_atomic_always_lock_free_constexpr/main.cpp b/regression/cbmc-cpp/cpp20_atomic_always_lock_free_constexpr/main.cpp new file mode 100644 index 000000000000..b6aaef8314cb --- /dev/null +++ b/regression/cbmc-cpp/cpp20_atomic_always_lock_free_constexpr/main.cpp @@ -0,0 +1,37 @@ +// N5008 [expr.const] + [temp.arg.nontype]: a template argument must be +// a converted constant expression; GCC/clang's builtin +// __atomic_always_lock_free(size, ptr) is a constant expression when +// its arguments are. CBMC folds it in a RUNTIME read (a plain assert +// on lock_free::value works) but not when the value is needed in a +// CONSTANT-EXPRESSION context -- here as the first argument of a +// conditional alias -- failing with "expected constant expression" and +// cascading into "symbol ... is unknown" for every dependent alias. +// This is libc++ 's __libcpp_is_always_lock_free / +// __contention_t_or_largest shape (aliases.h), one of the two +// remaining blockers of cpp20_ranges_basic_libcxx. +extern "C" void __CPROVER_assert(bool, const char *); +template +struct conditional_ +{ + using type = T; +}; +template +struct conditional_ +{ + using type = F; +}; +template +using conditional_t_ = typename conditional_::type; +template +struct lock_free +{ + static const bool value = __atomic_always_lock_free(sizeof(T), nullptr); +}; +using contention_t = long long; +using pick = conditional_t_::value, contention_t, int>; +int main() +{ + __CPROVER_assert( + sizeof(pick) == sizeof(long long), "alias picks lock-free type"); + return 0; +} diff --git a/regression/cbmc-cpp/cpp20_atomic_always_lock_free_constexpr/test.desc b/regression/cbmc-cpp/cpp20_atomic_always_lock_free_constexpr/test.desc new file mode 100644 index 000000000000..71567d6a2d1e --- /dev/null +++ b/regression/cbmc-cpp/cpp20_atomic_always_lock_free_constexpr/test.desc @@ -0,0 +1,15 @@ +KNOWNBUG gnu-extensions +main.cpp +--cpp20 --64 +^\[main\.assertion\.1\] line \d+ alias picks lock-free type: SUCCESS$ +^VERIFICATION SUCCESSFUL$ +^EXIT=0$ +^SIGNAL=0$ +-- +dropped the body +-- +Currently: "expected constant expression, but got +'__atomic_always_lock_free(...)'" followed by "symbol 'pick' is +unknown". The same builtin folds fine when only read at runtime. +`--64': the expected values are those of the LP64 data model (the 32-bit CI +build otherwise computes ILP32 layouts/types). diff --git a/regression/cbmc-cpp/cpp20_auto_member_of_base_instantiated_before_derived_is_complete/main.cpp b/regression/cbmc-cpp/cpp20_auto_member_of_base_instantiated_before_derived_is_complete/main.cpp new file mode 100644 index 000000000000..01e5c7eab53d --- /dev/null +++ b/regression/cbmc-cpp/cpp20_auto_member_of_base_instantiated_before_derived_is_complete/main.cpp @@ -0,0 +1,60 @@ +namespace std +{ +template +concept input_or_output_iterator = requires(_Iter __i) { __i; }; +namespace ranges::__cust_access +{ +template +concept __member_begin = requires(_Tp __t) { + { __t.begin } -> input_or_output_iterator; + __t; +}; +} // namespace ranges::__cust_access +namespace ranges +{ +template +bool enable_borrowed_range; +template +concept __maybe_borrowed_range = enable_borrowed_range<_Tp>; +namespace __cust_access +{ +struct _Begin +{ + template <__maybe_borrowed_range _Tp> + requires __member_begin<_Tp> + auto operator()(_Tp &&); +}; +} // namespace __cust_access +__cust_access::_Begin begin; +int end; +template +concept range = requires { end; }; +template +struct view_interface +{ + _Derived &_M_derived(); + auto front() + { + begin(_M_derived()); + } +}; +template +struct ref_view : view_interface> +{ + _Range begin; +}; +} // namespace ranges +} // namespace std +extern "C" void __CPROVER_assert(bool, const char *); +int main() +{ + // [temp.inst]/11, [dcl.spec.auto.general]/15: view_interface's front() is + // never used, so its body (whose return type would be deduced from it) is + // not instantiated; ref_view is complete here and has a member begin + __CPROVER_assert( + std::ranges::__cust_access::__member_begin &>, + "member begin found"); + __CPROVER_assert( + !std::ranges::__cust_access::__member_begin &>, + "WRONG (must FAIL)"); +} diff --git a/regression/cbmc-cpp/cpp20_auto_member_of_base_instantiated_before_derived_is_complete/test.desc b/regression/cbmc-cpp/cpp20_auto_member_of_base_instantiated_before_derived_is_complete/test.desc new file mode 100644 index 000000000000..18fb153453a2 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_auto_member_of_base_instantiated_before_derived_is_complete/test.desc @@ -0,0 +1,28 @@ +KNOWNBUG +main.cpp +--cpp20 +^\[main\.assertion\.1\] line \d+ member begin found: SUCCESS$ +^\[main\.assertion\.2\] line \d+ WRONG \(must FAIL\): FAILURE$ +^VERIFICATION FAILED$ +^EXIT=10$ +^SIGNAL=0$ +-- +^warning: ignoring +^CONVERSION ERROR$ +-- +N5008 [temp.inst]/11, [dcl.spec.auto.general]/15, [class.mem.general]/10: +view_interface>::front() has a deduced return type and is +never used, so its definition is not instantiated; ref_view is +complete where __member_begin &> is evaluated, and its +member `begin' satisfies the requirement. The front end instantiated +front()'s body while view_interface> -- ref_view's base -- +is being instantiated, i.e. before ref_view has its members; the body +evaluated the constraint of ranges::begin, __member_begin &> +came out false and was kept, so the later use was false as well. Members +with a deduced return type of class template specializations are now +deferred like any other member and converted when a call needs their type. +cvise reduction (/tmp/r163/red/nf_mb) of libstdc++'s , where the +parser's compound-requirement fast path (parse.cpp "Try compound +requirement") happened to hide it: without the fast path +cpp20_ranges_basic drops ranges_util.h:84 and operator| (round 163i). g++ +13 and clang++ 18 accept the program. Fails on bin53. diff --git a/regression/cbmc-cpp/cpp20_bit_cast/main.cpp b/regression/cbmc-cpp/cpp20_bit_cast/main.cpp new file mode 100644 index 000000000000..035d8d6e4fd1 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_bit_cast/main.cpp @@ -0,0 +1,16 @@ +#include +#if !defined(_MSC_VER) && \ + (defined(__cpp_lib_bit_cast) || (__has_include() && (!defined(__GNUC__) || __GNUC__ >= 11))) +// C++20 std::bit_cast +# include +int main() +{ + float f = 1.0f; + unsigned int i = std::bit_cast(f); + __CPROVER_assert(i == 0x3f800000u, "IEEE 754 bit pattern"); +} +#else +int main() +{ +} +#endif diff --git a/regression/cbmc-cpp/cpp20_bit_cast/test.desc b/regression/cbmc-cpp/cpp20_bit_cast/test.desc new file mode 100644 index 000000000000..364d916d224e --- /dev/null +++ b/regression/cbmc-cpp/cpp20_bit_cast/test.desc @@ -0,0 +1,9 @@ +KNOWNBUG +main.cpp +--cpp20 +^VERIFICATION SUCCESSFUL$ +^EXIT=0$ +^SIGNAL=0$ +-- +dropped the body +-- diff --git a/regression/cbmc-cpp/cpp20_bitfield_default_init/main.cpp b/regression/cbmc-cpp/cpp20_bitfield_default_init/main.cpp new file mode 100644 index 000000000000..d9ec87ca06de --- /dev/null +++ b/regression/cbmc-cpp/cpp20_bitfield_default_init/main.cpp @@ -0,0 +1,15 @@ +struct S +{ + unsigned x : 1 = 0; + unsigned y : 3 = 5; + int z : 8 = -1; +}; + +int main() +{ + S s; + __CPROVER_assert(s.x == 0, "x default"); + __CPROVER_assert(s.y == 5, "y default"); + __CPROVER_assert(s.z == -1, "z default"); + return 0; +} diff --git a/regression/cbmc-cpp/cpp20_bitfield_default_init/test.desc b/regression/cbmc-cpp/cpp20_bitfield_default_init/test.desc new file mode 100644 index 000000000000..99eacd802525 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_bitfield_default_init/test.desc @@ -0,0 +1,10 @@ +KNOWNBUG +main.cpp +--cpp20 +^EXIT=0$ +^SIGNAL=0$ +^VERIFICATION SUCCESSFUL$ +-- +^warning: ignoring +dropped the body +-- diff --git a/regression/cbmc-cpp/cpp20_bodyless_std_move/main.cpp b/regression/cbmc-cpp/cpp20_bodyless_std_move/main.cpp new file mode 100644 index 000000000000..115b20c5c539 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_bodyless_std_move/main.cpp @@ -0,0 +1,39 @@ +// cvise-reduced from a preprocessed libc++ push_back driver +// (the whole vector-semantic KNOWNBUG family: size() reads garbage +// after push_back). A call to a DECLARED-ONLY std::move -- which +// clang guarantees to link and behave as the [forward]/9 cast via its +// builtin-std-move treatment -- is modelled by CBMC as an +// unconstrained bodyless call: the returned reference is NULL/garbage +// and everything assigned through it is nondet. Per N5008 +// [forward]/9, std::move(t) is exactly +// static_cast&&>(t). +// clang++/valgrind run the program clean. +extern "C" void __CPROVER_assert(bool, const char *); + +namespace std +{ +inline namespace +{ +template +_Tp move(_Tp &&); +int __end_; +struct vector +{ + long size() + { + return __end_; + } + void push_back() + { + __end_++; + __end_ = move(__end_); + } +}; +} // namespace +} // namespace std +int main() +{ + std::vector v; + v.push_back(); + __CPROVER_assert(v.size(), "one size"); +} diff --git a/regression/cbmc-cpp/cpp20_bodyless_std_move/test.desc b/regression/cbmc-cpp/cpp20_bodyless_std_move/test.desc new file mode 100644 index 000000000000..a62cae7ec554 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_bodyless_std_move/test.desc @@ -0,0 +1,12 @@ +KNOWNBUG libcxx +main.cpp +--cpp20 --stdlib libc++ --object-bits 12 --unwind 3 --no-unwinding-assertions +^\[main\.assertion\.1\] line \d+ one size: SUCCESS$ +^VERIFICATION SUCCESSFUL$ +^EXIT=0$ +^SIGNAL=0$ +-- +dropped the body +-- +Fixed 2026-07-30: provide_stdlib_bodies synthesizes the [forward]/3, 9 +cast body for declared-only std::move / std::forward instances. diff --git a/regression/cbmc-cpp/cpp20_builtin_bit_cast_msvc/main.ii b/regression/cbmc-cpp/cpp20_builtin_bit_cast_msvc/main.ii new file mode 100644 index 000000000000..eba0f8e4c256 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_builtin_bit_cast_msvc/main.ii @@ -0,0 +1,23 @@ +extern "C" void __CPROVER_assert(bool, const char *); +// MSVC (since VS 2019 16.8), like g++ and clang++, provides +// __builtin_bit_cast(To, from), on which the MSVC STL's _Bit_cast and +// std::bit_cast (N5008 [bit.cast]) are built +template +constexpr To bit_cast_(const From &from) noexcept +{ + return __builtin_bit_cast(To, from); +} +struct pair16 +{ + unsigned short lo; + unsigned short hi; +}; +int main() +{ + unsigned int u = 0x00020001u; + pair16 p = bit_cast_(u); + __CPROVER_assert(p.lo == 1 && p.hi == 2, "bit cast"); + __CPROVER_assert(bit_cast_(p) == u, "round trip"); + __CPROVER_assert(p.lo == 2, "WRONG (must FAIL)"); + return 0; +} diff --git a/regression/cbmc-cpp/cpp20_builtin_bit_cast_msvc/test.desc b/regression/cbmc-cpp/cpp20_builtin_bit_cast_msvc/test.desc new file mode 100644 index 000000000000..d47283432e92 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_builtin_bit_cast_msvc/test.desc @@ -0,0 +1,17 @@ +KNOWNBUG +main.ii +--winx64 --cpp20 +^\[main\.assertion\.1\] line \d+ bit cast: SUCCESS$ +^\[main\.assertion\.2\] line \d+ round trip: SUCCESS$ +^\[main\.assertion\.3\] line \d+ WRONG \(must FAIL\): FAILURE$ +^VERIFICATION FAILED$ +^EXIT=10$ +^SIGNAL=0$ +-- +^warning: ignoring +^CONVERSION ERROR$ +-- +__builtin_bit_cast was a keyword in GCC and clang modes only; in Visual +Studio mode it was an unknown symbol, and the MSVC STL's _Bit_cast lost its +body (44 cbmc-cpp failures on VS 2022). Preprocessed, as cbmc on Linux +would otherwise use the host's (GNU) preprocessor. diff --git a/regression/cbmc-cpp/cpp20_builtin_decay_array_and_function/dependent.cpp b/regression/cbmc-cpp/cpp20_builtin_decay_array_and_function/dependent.cpp new file mode 100644 index 000000000000..bd592b1df7eb --- /dev/null +++ b/regression/cbmc-cpp/cpp20_builtin_decay_array_and_function/dependent.cpp @@ -0,0 +1,21 @@ +extern "C" void __CPROVER_assert(bool, const char *); +// [meta.trans.other] decay through an alias template and a member typedef of +// a class template (libstdc++ 16's std::decay is `using type = __decay(_Tp);') +template +constexpr bool same = __is_same(T, U); +template +using decay_t = __decay(T); +template +struct D +{ + using type = __decay(T); +}; +int main() +{ + __CPROVER_assert( + same, const int *> && + same::type, char (*)(int)> && + same, long>, + "dependent"); + __CPROVER_assert(!same, int *>, "WRONG (must FAIL)"); +} diff --git a/regression/cbmc-cpp/cpp20_builtin_decay_array_and_function/function_type.cpp b/regression/cbmc-cpp/cpp20_builtin_decay_array_and_function/function_type.cpp new file mode 100644 index 000000000000..ee8d9eec3981 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_builtin_decay_array_and_function/function_type.cpp @@ -0,0 +1,10 @@ +extern "C" void __CPROVER_assert(bool, const char *); +// [meta.trans.other] decay of a function type (no reference): a pointer to it +template +constexpr bool same = __is_same(T, U); +int main() +{ + __CPROVER_assert(same<__decay(int(long)), int (*)(long)>, "function type"); + __CPROVER_assert( + !same<__decay(int(long)), int (*)(long)>, "WRONG (must FAIL)"); +} diff --git a/regression/cbmc-cpp/cpp20_builtin_decay_array_and_function/main.cpp b/regression/cbmc-cpp/cpp20_builtin_decay_array_and_function/main.cpp new file mode 100644 index 000000000000..dbb9ae8e67f5 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_builtin_decay_array_and_function/main.cpp @@ -0,0 +1,17 @@ +extern "C" void __CPROVER_assert(bool, const char *); +// GCC's (and Clang's) __decay(T) builtin, libstdc++ 16's std::decay: N5008 +// [meta.trans.other] decay -- with U = remove_reference_t, an array +// of U becomes a pointer to its element type, a function type a pointer to +// it, any other type remove_cv_t +template +constexpr bool same = __is_same(T, U); +int main() +{ + __CPROVER_assert(same<__decay(const volatile int &), int>, "cv-qualified"); + __CPROVER_assert(same<__decay(int *const), int *>, "top-level const"); + __CPROVER_assert(same<__decay(int[5]), int *>, "array"); + __CPROVER_assert(same<__decay(int(&)[5]), int *>, "reference to array"); + __CPROVER_assert(same<__decay(const int[]), const int *>, "unknown bound"); + __CPROVER_assert(same<__decay(int (&)(long)), int (*)(long)>, "function"); + __CPROVER_assert(!same<__decay(int[5]), int *>, "WRONG (must FAIL)"); +} diff --git a/regression/cbmc-cpp/cpp20_builtin_decay_array_and_function/test.desc b/regression/cbmc-cpp/cpp20_builtin_decay_array_and_function/test.desc new file mode 100644 index 000000000000..c0acdce2000c --- /dev/null +++ b/regression/cbmc-cpp/cpp20_builtin_decay_array_and_function/test.desc @@ -0,0 +1,29 @@ +KNOWNBUG +main.cpp +--cpp20 +^\[main\.assertion\.1\] line \d+ cv-qualified: SUCCESS$ +^\[main\.assertion\.2\] line \d+ top-level const: SUCCESS$ +^\[main\.assertion\.3\] line \d+ array: SUCCESS$ +^\[main\.assertion\.4\] line \d+ reference to array: SUCCESS$ +^\[main\.assertion\.5\] line \d+ unknown bound: SUCCESS$ +^\[main\.assertion\.6\] line \d+ function: SUCCESS$ +^\[main\.assertion\.7\] line \d+ WRONG \(must FAIL\): FAILURE$ +^VERIFICATION FAILED$ +^EXIT=10$ +^SIGNAL=0$ +-- +^warning: ignoring +^CONVERSION ERROR$ +-- +N5008 [meta.trans.other] decay: libstdc++ 16 implements std::decay with +GCC's __decay(T) builtin. The front end parsed __decay as __remove_cvref +(parse.cpp), so an array or function type did not decay to a pointer +(std::__decay_t was int[5]), and a function type written without a +reference, `__decay(int(long))', was a parse error (bin53). The node is now +marked #decay and its operand parsed as a type-id that may be a function +type. test_dependent.desc: through an alias template and a member +typedef. Found while +reducing the libstdc++ 16 ranges failure (iterator_t of an array inside +ranges::__access::__member_begin); not the root cause of a CORE failure. +g++ 16 and clang++ 18 accept this program, and it fails only its WRONG +assertion (g++ 13 has no __decay). diff --git a/regression/cbmc-cpp/cpp20_builtin_decay_array_and_function/test_dependent.desc b/regression/cbmc-cpp/cpp20_builtin_decay_array_and_function/test_dependent.desc new file mode 100644 index 000000000000..f7c98d89a789 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_builtin_decay_array_and_function/test_dependent.desc @@ -0,0 +1,14 @@ +KNOWNBUG +dependent.cpp +--cpp20 +^\[main\.assertion\.1\] line \d+ dependent: SUCCESS$ +^\[main\.assertion\.2\] line \d+ WRONG \(must FAIL\): FAILURE$ +^VERIFICATION FAILED$ +^EXIT=10$ +^SIGNAL=0$ +-- +^warning: ignoring +^CONVERSION ERROR$ +-- +N5008 [meta.trans.other]; see test.desc. clang++ 18 accepts this program, +and it fails only its WRONG assertion (g++ 13 has no __decay). diff --git a/regression/cbmc-cpp/cpp20_builtin_decay_array_and_function/test_function_type.desc b/regression/cbmc-cpp/cpp20_builtin_decay_array_and_function/test_function_type.desc new file mode 100644 index 000000000000..f08f04bd0fa1 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_builtin_decay_array_and_function/test_function_type.desc @@ -0,0 +1,17 @@ +KNOWNBUG +function_type.cpp +--cpp20 +^\[main\.assertion\.1\] line \d+ function type: SUCCESS$ +^\[main\.assertion\.2\] line \d+ WRONG \(must FAIL\): FAILURE$ +^VERIFICATION FAILED$ +^EXIT=10$ +^SIGNAL=0$ +-- +^warning: ignoring +^PARSING ERROR$ +-- +See test.desc: `__decay(int(long))' was a parse error ("parse error before +') ) , int'", bin53), the builtin's argument being parsed as for +__remove_cvref. +g++ 16 and clang++ 18 accept this program, and it fails only its WRONG +assertion. diff --git a/regression/cbmc-cpp/cpp20_builtin_is_trivially_equality_comparable_class/main.cpp b/regression/cbmc-cpp/cpp20_builtin_is_trivially_equality_comparable_class/main.cpp new file mode 100644 index 000000000000..b2d944f9b4b2 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_builtin_is_trivially_equality_comparable_class/main.cpp @@ -0,0 +1,89 @@ +// Clang's __is_trivially_equality_comparable(T) (an extension; libc++ uses it +// to replace comparisons by memcmp/memchr): true for a class whose +// operator== is defaulted ([class.eq]/3: it compares the subobjects in +// order; [class.compare.default]/4: a defaulted operator<=> declares one) +// when every subobject is itself trivially equality comparable and the +// class has no padding, so equal values have equal object representations. +#include + +extern "C" void __CPROVER_assert(bool, const char *); + +struct D +{ + int x; + int y; + bool operator==(const D &) const = default; +}; +struct Padded +{ + char c; + int i; + bool operator==(const Padded &) const = default; +}; +struct NoEquality +{ + int x; +}; +struct UserEquality +{ + int x; + bool operator==(const UserEquality &o) const + { + return x == o.x; + } +}; +struct FloatMember +{ + float f; + bool operator==(const FloatMember &) const = default; +}; +struct Nested +{ + D d; + bool operator==(const Nested &) const = default; +}; +struct FriendForm +{ + int x; + friend bool operator==(const FriendForm &, const FriendForm &) = default; +}; +struct Derived : D +{ + int z; + bool operator==(const Derived &) const = default; +}; +struct ByValue +{ + int x; + friend bool operator==(ByValue, ByValue) = default; +}; +struct Spaceship +{ + int x; + auto operator<=>(const Spaceship &) const = default; +}; +struct NestedNoEquality +{ + NoEquality n; + bool operator==(const NestedNoEquality &) const = delete; +}; + +static_assert(__is_trivially_equality_comparable(D), "defaulted, no padding"); +static_assert(__is_trivially_equality_comparable(Nested), "nested"); +static_assert(!__is_trivially_equality_comparable(Padded), "padding"); +static_assert(!__is_trivially_equality_comparable(NoEquality), "no operator=="); +static_assert( + !__is_trivially_equality_comparable(UserEquality), + "user-provided"); +static_assert(!__is_trivially_equality_comparable(FloatMember), "float"); +static_assert(__is_trivially_equality_comparable(FriendForm), "friend"); +static_assert(__is_trivially_equality_comparable(Derived), "base"); +static_assert(!__is_trivially_equality_comparable(NestedNoEquality), "deleted"); +static_assert(__is_trivially_equality_comparable(ByValue), "by value"); +static_assert(__is_trivially_equality_comparable(Spaceship), "from <=>"); + +int main() +{ + __CPROVER_assert(false, "WRONG (must FAIL)"); + return 0; +} diff --git a/regression/cbmc-cpp/cpp20_builtin_is_trivially_equality_comparable_class/test.desc b/regression/cbmc-cpp/cpp20_builtin_is_trivially_equality_comparable_class/test.desc new file mode 100644 index 000000000000..a520efff3fa6 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_builtin_is_trivially_equality_comparable_class/test.desc @@ -0,0 +1,14 @@ +KNOWNBUG libcxx +main.cpp +--cpp20 --stdlib libc++ +^\[main\.assertion\.1\] .* WRONG \(must FAIL\): FAILURE$ +^VERIFICATION FAILED$ +^EXIT=10$ +^SIGNAL=0$ +-- +^warning: ignoring +static assertion failed +-- +Classes: a defaulted operator== (member or friend), bases and members that +qualify themselves, and no padding. clang++ 18 accepts this program (the +built-in is clang-only), and it fails only its WRONG assertion. diff --git a/regression/cbmc-cpp/cpp20_builtin_lt_synthesizes_from_spaceship/main.cpp b/regression/cbmc-cpp/cpp20_builtin_lt_synthesizes_from_spaceship/main.cpp new file mode 100644 index 000000000000..77cbba694448 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_builtin_lt_synthesizes_from_spaceship/main.cpp @@ -0,0 +1,36 @@ +// clang >= 22 provides the builtin type predicate +// __builtin_lt_synthesizes_from_spaceship(T, U), and libc++ >= 22 uses +// it in __utility/default_three_way_comparator.h whenever +// __has_builtin says it exists. CBMC preprocesses with the SYSTEM +// compiler, whose __has_builtin answers for itself -- so against +// libc++-22 the header takes the builtin branch and CBMC's parser +// fails ("parse error before 'const _LHS & ,'"). Any / +// -including test breaks in an archlinux (clang 22) container. +// This kernel is self-gating: hosts whose preprocessor lacks the +// builtin compile the #else branch and pass trivially. +extern "C" void __CPROVER_assert(bool, const char *); +struct pt +{ + int v; + bool operator<(const pt &o) const + { + return v < o.v; + } +}; +#if defined(__has_builtin) && \ + __has_builtin(__builtin_lt_synthesizes_from_spaceship) +template +struct synth +{ + static const bool value = + __builtin_lt_synthesizes_from_spaceship(const L &, const R &); +}; +const bool r = synth::value; +#else +const bool r = false; +#endif +int main() +{ + __CPROVER_assert(r == r, "spaceship-synthesis builtin parses"); + return 0; +} diff --git a/regression/cbmc-cpp/cpp20_builtin_lt_synthesizes_from_spaceship/test.desc b/regression/cbmc-cpp/cpp20_builtin_lt_synthesizes_from_spaceship/test.desc new file mode 100644 index 000000000000..6e7d59f459ea --- /dev/null +++ b/regression/cbmc-cpp/cpp20_builtin_lt_synthesizes_from_spaceship/test.desc @@ -0,0 +1,15 @@ +KNOWNBUG +main.cpp +--cpp20 +^\[main\.assertion\.1\] line \d+ spaceship-synthesis builtin parses: SUCCESS$ +^VERIFICATION SUCCESSFUL$ +^EXIT=0$ +^SIGNAL=0$ +-- +dropped the body +-- +Passes trivially where the system preprocessor lacks the builtin +(clang <= 21, gcc); FAILS with a parse error in an archlinux/clang-22 +container, where libc++'s default_three_way_comparator.h also breaks. +Fix direction: lex the builtin as a binary type predicate +(TOK_BINARY_TYPE_PREDICATE family in scanner.l). diff --git a/regression/cbmc-cpp/cpp20_builtin_make_signed_corresponding_type/main.cpp b/regression/cbmc-cpp/cpp20_builtin_make_signed_corresponding_type/main.cpp new file mode 100644 index 000000000000..b39871bd45f5 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_builtin_make_signed_corresponding_type/main.cpp @@ -0,0 +1,57 @@ +// N5008 [meta.trans.sign], Table 59: make_signed is T for a signed +// integer type, the corresponding signed integer type ([basic.fundamental] +// /2-3, same rank) for an unsigned one, and otherwise the signed integer +// type of the smallest rank with the same size; cv-qualifiers are kept. +// Clang's __make_signed / __make_unsigned (libc++'s make_signed_t) returned +// a bare bit-vector type, not the C type: `type_identity<__make_signed(S)>' +// named a different specialization, and in libc++'s iota_view the +// iterator's constructor then found no viable std::move and lost its body. +extern "C" void __CPROVER_assert(bool, const char *); + +template +struct type_identity +{ + typedef T type; +}; +template +using type_identity_t = typename type_identity::type; + +template +T &&move(T &t) +{ + return static_cast(t); +} + +static_assert(__is_same(__make_signed(unsigned), int), "unsigned int"); +static_assert(__is_same(__make_signed(long), long), "long kept"); +static_assert(__is_same(__make_signed(char), signed char), "char"); +static_assert(__is_same(__make_unsigned(int), unsigned), "int"); +static_assert( + __is_same(__make_unsigned(unsigned long long), unsigned long long), + "unsigned long long kept"); +static_assert(__is_same(__make_unsigned(char16_t), unsigned short), "char16_t"); +static_assert(__is_same(__make_signed(const unsigned), const int), "cv"); + +template +struct iota_view +{ + struct iterator + { + using difference_type = type_identity_t<__make_signed(S)>; + S value_; + iterator(S value) : value_(move(value)) + { + } + } bound_; + iota_view(S, type_identity_t bound) : bound_(move(bound)) + { + } +}; + +int main() +{ + iota_view v(1, 4); + __CPROVER_assert(v.bound_.value_ == 4, "iterator constructor"); + __CPROVER_assert(false, "WRONG (must FAIL)"); + return 0; +} diff --git a/regression/cbmc-cpp/cpp20_builtin_make_signed_corresponding_type/test.desc b/regression/cbmc-cpp/cpp20_builtin_make_signed_corresponding_type/test.desc new file mode 100644 index 000000000000..01a5d31f08ab --- /dev/null +++ b/regression/cbmc-cpp/cpp20_builtin_make_signed_corresponding_type/test.desc @@ -0,0 +1,15 @@ +KNOWNBUG +main.cpp +--cpp20 --stdlib libc++ +^\[main\.assertion\.1\] .* iterator constructor: SUCCESS$ +^\[main\.assertion\.2\] .* WRONG \(must FAIL\): FAILURE$ +^VERIFICATION FAILED$ +^EXIT=10$ +^SIGNAL=0$ +-- +^warning: ignoring +static assertion +dropped the body +-- +The builtins are clang's; clang++ 18 accepts this program, and it fails +only its WRONG assertion. diff --git a/regression/cbmc-cpp/cpp20_builtin_unary_type_traits_vs_clang/main.cpp b/regression/cbmc-cpp/cpp20_builtin_unary_type_traits_vs_clang/main.cpp new file mode 100644 index 000000000000..3c60099f5f5d --- /dev/null +++ b/regression/cbmc-cpp/cpp20_builtin_unary_type_traits_vs_clang/main.cpp @@ -0,0 +1,2111 @@ +// The unary type-trait built-ins of GCC and Clang (used by libc++ and +// libstdc++ for ), checked against clang 18 for scalar, +// compound and class types. Fixed: enumerations were integral and +// arithmetic; pointers to members and std::nullptr_t were pointers and +// std::nullptr_t compound; references were standard-layout and POD; void, +// function types, arrays of unknown bound and classes with deleted or +// inaccessible destructors were destructible; defaulted special members +// made a class non-trivial; a reference member made it not trivially +// copyable; a class with data members in a base and in itself was +// standard-layout; constructors were not checked for constexpr in +// __is_literal_type; __has_unique_object_representations, +// __is_trivially_relocatable and the GCC __has_trivial_* / __has_nothrow_* +// traits were always false. +// Where clang and gcc deviate from N5008 [class.prop] (a class with a +// deleted destructor is trivially copyable for them; a class with a +// reference member is trivial), the front end follows the standard and +// those cases are not checked. +extern "C" void __CPROVER_assert(bool, const char *); +using Fn = void(); +struct S +{ + int x; +}; +struct Empty +{ +}; +struct Final final +{ + int x; +}; +struct Poly +{ + virtual void f(); + int x; +}; +struct Virt +{ + virtual ~Virt(); +}; +struct Dtor +{ + ~Dtor(); + int x; +}; +struct NoDtor +{ + ~NoDtor() = delete; +}; +struct Agg +{ + int a; + double b; +}; +union U +{ + int i; + float f; +}; +struct NonTriv +{ + NonTriv(); + NonTriv(const NonTriv &); + NonTriv &operator=(const NonTriv &); + int x; +}; +struct Padded +{ + char c; + int i; +}; +struct Ref +{ + int &r; +}; +enum E +{ + e0 +}; +enum class EC +{ + a +}; +struct NonTrivD +{ + NonTrivD(); + NonTrivD(const NonTrivD &); + NonTrivD &operator=(const NonTrivD &); + ~NonTrivD(); + int x; +}; +struct UserCopy +{ + UserCopy() = default; + UserCopy(const UserCopy &) + { + } + int x; +}; +struct UserAssign +{ + UserAssign &operator=(const UserAssign &) + { + return *this; + } + int x; +}; +struct Defaulted +{ + Defaulted() = default; + Defaulted(const Defaulted &) = default; + Defaulted &operator=(const Defaulted &) = default; + ~Defaulted() = default; + int x; +}; +struct HasNT +{ + NonTrivD n; +}; +struct DerivNT : NonTrivD +{ +}; +struct DefInit +{ + int x = 3; +}; +class PrivDtor +{ + ~PrivDtor(); +}; +struct CExpr +{ + constexpr CExpr(int) + { + } + CExpr(const CExpr &); + +private: + int x; +}; +struct NonCExpr +{ + NonCExpr(int); + +private: + int x; +}; +struct Base +{ + int a; +}; +struct Deriv : Base +{ + int b; +}; +struct Bits +{ + unsigned a : 3; + unsigned b : 5; +}; +union UPad +{ + char c; + int i; +}; +using Arr2 = int[2][3]; +struct EmptyD : Base +{ +}; +struct ConstMem +{ + const int c; +}; +static_assert(__has_nothrow_assign(int)); +static_assert(!__has_nothrow_assign(const int)); +static_assert(__has_nothrow_assign(volatile int)); +static_assert(__has_nothrow_assign(unsigned)); +static_assert(__has_nothrow_assign(bool)); +static_assert(__has_nothrow_assign(char)); +static_assert(__has_nothrow_assign(float)); +static_assert(__has_nothrow_assign(double)); +static_assert(__has_nothrow_assign(int *)); +static_assert(!__has_nothrow_assign(int &)); +static_assert(!__has_nothrow_assign(int &&)); +static_assert(__has_nothrow_assign(int[2])); +static_assert(__has_nothrow_assign(int[])); +static_assert(!__has_nothrow_assign(void)); +static_assert(__has_nothrow_assign(decltype(nullptr))); +static_assert(__has_nothrow_assign(int S::*)); +static_assert(__has_nothrow_assign(void(S::*)())); +static_assert(!__has_nothrow_assign(Fn)); +static_assert(__has_nothrow_assign(void (*)())); +static_assert(__has_nothrow_assign(E)); +static_assert(__has_nothrow_assign(EC)); +static_assert(__has_nothrow_assign(S)); +static_assert(__has_nothrow_assign(Empty)); +static_assert(__has_nothrow_assign(Final)); +static_assert(__has_nothrow_assign(Poly)); +static_assert(__has_nothrow_assign(Virt)); +static_assert(__has_nothrow_assign(Dtor)); +static_assert(__has_nothrow_assign(NoDtor)); +static_assert(__has_nothrow_assign(Agg)); +static_assert(__has_nothrow_assign(U)); +static_assert(!__has_nothrow_assign(NonTriv)); +static_assert(__has_nothrow_assign(Padded)); +static_assert(__has_nothrow_assign(Ref)); +static_assert(__has_nothrow_constructor(int)); +static_assert(__has_nothrow_constructor(const int)); +static_assert(__has_nothrow_constructor(volatile int)); +static_assert(__has_nothrow_constructor(unsigned)); +static_assert(__has_nothrow_constructor(bool)); +static_assert(__has_nothrow_constructor(char)); +static_assert(__has_nothrow_constructor(float)); +static_assert(__has_nothrow_constructor(double)); +static_assert(__has_nothrow_constructor(int *)); +static_assert(!__has_nothrow_constructor(int &)); +static_assert(!__has_nothrow_constructor(int &&)); +static_assert(__has_nothrow_constructor(int[2])); +static_assert(__has_nothrow_constructor(int[])); +static_assert(!__has_nothrow_constructor(void)); +static_assert(__has_nothrow_constructor(decltype(nullptr))); +static_assert(__has_nothrow_constructor(int S::*)); +static_assert(__has_nothrow_constructor(void(S::*)())); +static_assert(!__has_nothrow_constructor(Fn)); +static_assert(__has_nothrow_constructor(void (*)())); +static_assert(__has_nothrow_constructor(E)); +static_assert(__has_nothrow_constructor(EC)); +static_assert(__has_nothrow_constructor(S)); +static_assert(__has_nothrow_constructor(Empty)); +static_assert(__has_nothrow_constructor(Final)); +static_assert(__has_nothrow_constructor(Poly)); +static_assert(__has_nothrow_constructor(Virt)); +static_assert(__has_nothrow_constructor(Dtor)); +static_assert(__has_nothrow_constructor(NoDtor)); +static_assert(__has_nothrow_constructor(Agg)); +static_assert(__has_nothrow_constructor(U)); +static_assert(!__has_nothrow_constructor(NonTriv)); +static_assert(__has_nothrow_constructor(Padded)); +static_assert(__has_nothrow_constructor(Ref)); +static_assert(__has_nothrow_copy(int)); +static_assert(__has_nothrow_copy(const int)); +static_assert(__has_nothrow_copy(volatile int)); +static_assert(__has_nothrow_copy(unsigned)); +static_assert(__has_nothrow_copy(bool)); +static_assert(__has_nothrow_copy(char)); +static_assert(__has_nothrow_copy(float)); +static_assert(__has_nothrow_copy(double)); +static_assert(__has_nothrow_copy(int *)); +static_assert(__has_nothrow_copy(int &)); +static_assert(__has_nothrow_copy(int &&)); +static_assert(__has_nothrow_copy(int[2])); +static_assert(__has_nothrow_copy(int[])); +static_assert(!__has_nothrow_copy(void)); +static_assert(__has_nothrow_copy(decltype(nullptr))); +static_assert(__has_nothrow_copy(int S::*)); +static_assert(__has_nothrow_copy(void(S::*)())); +static_assert(!__has_nothrow_copy(Fn)); +static_assert(__has_nothrow_copy(void (*)())); +static_assert(__has_nothrow_copy(E)); +static_assert(__has_nothrow_copy(EC)); +static_assert(__has_nothrow_copy(S)); +static_assert(__has_nothrow_copy(Empty)); +static_assert(__has_nothrow_copy(Final)); +static_assert(__has_nothrow_copy(Poly)); +static_assert(__has_nothrow_copy(Virt)); +static_assert(__has_nothrow_copy(Dtor)); +static_assert(__has_nothrow_copy(NoDtor)); +static_assert(__has_nothrow_copy(Agg)); +static_assert(__has_nothrow_copy(U)); +static_assert(!__has_nothrow_copy(NonTriv)); +static_assert(__has_nothrow_copy(Padded)); +static_assert(__has_nothrow_copy(Ref)); +static_assert(__has_trivial_assign(int)); +static_assert(!__has_trivial_assign(const int)); +static_assert(__has_trivial_assign(volatile int)); +static_assert(__has_trivial_assign(unsigned)); +static_assert(__has_trivial_assign(bool)); +static_assert(__has_trivial_assign(char)); +static_assert(__has_trivial_assign(float)); +static_assert(__has_trivial_assign(double)); +static_assert(__has_trivial_assign(int *)); +static_assert(!__has_trivial_assign(int &)); +static_assert(!__has_trivial_assign(int &&)); +static_assert(__has_trivial_assign(int[2])); +static_assert(__has_trivial_assign(int[])); +static_assert(!__has_trivial_assign(void)); +static_assert(__has_trivial_assign(decltype(nullptr))); +static_assert(__has_trivial_assign(int S::*)); +static_assert(__has_trivial_assign(void(S::*)())); +static_assert(!__has_trivial_assign(Fn)); +static_assert(__has_trivial_assign(void (*)())); +static_assert(__has_trivial_assign(E)); +static_assert(__has_trivial_assign(EC)); +static_assert(__has_trivial_assign(S)); +static_assert(__has_trivial_assign(Empty)); +static_assert(__has_trivial_assign(Final)); +static_assert(!__has_trivial_assign(Poly)); +static_assert(!__has_trivial_assign(Virt)); +static_assert(__has_trivial_assign(Dtor)); +static_assert(__has_trivial_assign(NoDtor)); +static_assert(__has_trivial_assign(Agg)); +static_assert(__has_trivial_assign(U)); +static_assert(!__has_trivial_assign(NonTriv)); +static_assert(__has_trivial_assign(Padded)); +static_assert(__has_trivial_assign(Ref)); +static_assert(__has_trivial_constructor(int)); +static_assert(__has_trivial_constructor(const int)); +static_assert(__has_trivial_constructor(volatile int)); +static_assert(__has_trivial_constructor(unsigned)); +static_assert(__has_trivial_constructor(bool)); +static_assert(__has_trivial_constructor(char)); +static_assert(__has_trivial_constructor(float)); +static_assert(__has_trivial_constructor(double)); +static_assert(__has_trivial_constructor(int *)); +static_assert(!__has_trivial_constructor(int &)); +static_assert(!__has_trivial_constructor(int &&)); +static_assert(__has_trivial_constructor(int[2])); +static_assert(__has_trivial_constructor(int[])); +static_assert(!__has_trivial_constructor(void)); +static_assert(__has_trivial_constructor(decltype(nullptr))); +static_assert(__has_trivial_constructor(int S::*)); +static_assert(__has_trivial_constructor(void(S::*)())); +static_assert(!__has_trivial_constructor(Fn)); +static_assert(__has_trivial_constructor(void (*)())); +static_assert(__has_trivial_constructor(E)); +static_assert(__has_trivial_constructor(EC)); +static_assert(__has_trivial_constructor(S)); +static_assert(__has_trivial_constructor(Empty)); +static_assert(__has_trivial_constructor(Final)); +static_assert(!__has_trivial_constructor(Poly)); +static_assert(!__has_trivial_constructor(Virt)); +static_assert(__has_trivial_constructor(Dtor)); +static_assert(__has_trivial_constructor(NoDtor)); +static_assert(__has_trivial_constructor(Agg)); +static_assert(__has_trivial_constructor(U)); +static_assert(!__has_trivial_constructor(NonTriv)); +static_assert(__has_trivial_constructor(Padded)); +static_assert(__has_trivial_constructor(Ref)); +static_assert(__has_trivial_copy(int)); +static_assert(__has_trivial_copy(const int)); +static_assert(__has_trivial_copy(volatile int)); +static_assert(__has_trivial_copy(unsigned)); +static_assert(__has_trivial_copy(bool)); +static_assert(__has_trivial_copy(char)); +static_assert(__has_trivial_copy(float)); +static_assert(__has_trivial_copy(double)); +static_assert(__has_trivial_copy(int *)); +static_assert(__has_trivial_copy(int &)); +static_assert(__has_trivial_copy(int &&)); +static_assert(__has_trivial_copy(int[2])); +static_assert(__has_trivial_copy(int[])); +static_assert(!__has_trivial_copy(void)); +static_assert(__has_trivial_copy(decltype(nullptr))); +static_assert(__has_trivial_copy(int S::*)); +static_assert(__has_trivial_copy(void(S::*)())); +static_assert(!__has_trivial_copy(Fn)); +static_assert(__has_trivial_copy(void (*)())); +static_assert(__has_trivial_copy(E)); +static_assert(__has_trivial_copy(EC)); +static_assert(__has_trivial_copy(S)); +static_assert(__has_trivial_copy(Empty)); +static_assert(__has_trivial_copy(Final)); +static_assert(!__has_trivial_copy(Poly)); +static_assert(!__has_trivial_copy(Virt)); +static_assert(__has_trivial_copy(Dtor)); +static_assert(__has_trivial_copy(NoDtor)); +static_assert(__has_trivial_copy(Agg)); +static_assert(__has_trivial_copy(U)); +static_assert(!__has_trivial_copy(NonTriv)); +static_assert(__has_trivial_copy(Padded)); +static_assert(__has_trivial_copy(Ref)); +static_assert(__has_trivial_destructor(int)); +static_assert(__has_trivial_destructor(const int)); +static_assert(__has_trivial_destructor(volatile int)); +static_assert(__has_trivial_destructor(unsigned)); +static_assert(__has_trivial_destructor(bool)); +static_assert(__has_trivial_destructor(char)); +static_assert(__has_trivial_destructor(float)); +static_assert(__has_trivial_destructor(double)); +static_assert(__has_trivial_destructor(int *)); +static_assert(__has_trivial_destructor(int &)); +static_assert(__has_trivial_destructor(int &&)); +static_assert(__has_trivial_destructor(int[2])); +static_assert(__has_trivial_destructor(int[])); +static_assert(!__has_trivial_destructor(void)); +static_assert(__has_trivial_destructor(decltype(nullptr))); +static_assert(__has_trivial_destructor(int S::*)); +static_assert(__has_trivial_destructor(void(S::*)())); +static_assert(!__has_trivial_destructor(Fn)); +static_assert(__has_trivial_destructor(void (*)())); +static_assert(__has_trivial_destructor(E)); +static_assert(__has_trivial_destructor(EC)); +static_assert(__has_trivial_destructor(S)); +static_assert(__has_trivial_destructor(Empty)); +static_assert(__has_trivial_destructor(Final)); +static_assert(__has_trivial_destructor(Poly)); +static_assert(!__has_trivial_destructor(Virt)); +static_assert(!__has_trivial_destructor(Dtor)); +static_assert(__has_trivial_destructor(NoDtor)); +static_assert(__has_trivial_destructor(Agg)); +static_assert(__has_trivial_destructor(U)); +static_assert(__has_trivial_destructor(NonTriv)); +static_assert(__has_trivial_destructor(Padded)); +static_assert(__has_trivial_destructor(Ref)); +static_assert(__has_unique_object_representations(int)); +static_assert(__has_unique_object_representations(const int)); +static_assert(__has_unique_object_representations(volatile int)); +static_assert(__has_unique_object_representations(unsigned)); +static_assert(__has_unique_object_representations(bool)); +static_assert(__has_unique_object_representations(char)); +static_assert(!__has_unique_object_representations(float)); +static_assert(!__has_unique_object_representations(double)); +static_assert(__has_unique_object_representations(int *)); +static_assert(!__has_unique_object_representations(int &)); +static_assert(!__has_unique_object_representations(int &&)); +static_assert(__has_unique_object_representations(int[2])); +static_assert(__has_unique_object_representations(int[])); +static_assert(!__has_unique_object_representations(void)); +static_assert(!__has_unique_object_representations(decltype(nullptr))); +static_assert(__has_unique_object_representations(int S::*)); +static_assert(__has_unique_object_representations(void(S::*)())); +static_assert(!__has_unique_object_representations(Fn)); +static_assert(__has_unique_object_representations(void (*)())); +static_assert(__has_unique_object_representations(E)); +static_assert(__has_unique_object_representations(EC)); +static_assert(__has_unique_object_representations(S)); +static_assert(!__has_unique_object_representations(Empty)); +static_assert(__has_unique_object_representations(Final)); +static_assert(!__has_unique_object_representations(Poly)); +static_assert(!__has_unique_object_representations(Virt)); +static_assert(!__has_unique_object_representations(Dtor)); +static_assert(!__has_unique_object_representations(NoDtor)); +static_assert(!__has_unique_object_representations(Agg)); +static_assert(!__has_unique_object_representations(U)); +static_assert(!__has_unique_object_representations(NonTriv)); +static_assert(!__has_unique_object_representations(Padded)); +static_assert(!__has_virtual_destructor(int)); +static_assert(!__has_virtual_destructor(const int)); +static_assert(!__has_virtual_destructor(volatile int)); +static_assert(!__has_virtual_destructor(unsigned)); +static_assert(!__has_virtual_destructor(bool)); +static_assert(!__has_virtual_destructor(char)); +static_assert(!__has_virtual_destructor(float)); +static_assert(!__has_virtual_destructor(double)); +static_assert(!__has_virtual_destructor(int *)); +static_assert(!__has_virtual_destructor(int &)); +static_assert(!__has_virtual_destructor(int &&)); +static_assert(!__has_virtual_destructor(int[2])); +static_assert(!__has_virtual_destructor(int[])); +static_assert(!__has_virtual_destructor(void)); +static_assert(!__has_virtual_destructor(decltype(nullptr))); +static_assert(!__has_virtual_destructor(int S::*)); +static_assert(!__has_virtual_destructor(void(S::*)())); +static_assert(!__has_virtual_destructor(Fn)); +static_assert(!__has_virtual_destructor(void (*)())); +static_assert(!__has_virtual_destructor(E)); +static_assert(!__has_virtual_destructor(EC)); +static_assert(!__has_virtual_destructor(S)); +static_assert(!__has_virtual_destructor(Empty)); +static_assert(!__has_virtual_destructor(Final)); +static_assert(!__has_virtual_destructor(Poly)); +static_assert(__has_virtual_destructor(Virt)); +static_assert(!__has_virtual_destructor(Dtor)); +static_assert(!__has_virtual_destructor(NoDtor)); +static_assert(!__has_virtual_destructor(Agg)); +static_assert(!__has_virtual_destructor(U)); +static_assert(!__has_virtual_destructor(NonTriv)); +static_assert(!__has_virtual_destructor(Padded)); +static_assert(!__has_virtual_destructor(Ref)); +static_assert(!__is_aggregate(int)); +static_assert(!__is_aggregate(const int)); +static_assert(!__is_aggregate(volatile int)); +static_assert(!__is_aggregate(unsigned)); +static_assert(!__is_aggregate(bool)); +static_assert(!__is_aggregate(char)); +static_assert(!__is_aggregate(float)); +static_assert(!__is_aggregate(double)); +static_assert(!__is_aggregate(int *)); +static_assert(!__is_aggregate(int &)); +static_assert(!__is_aggregate(int &&)); +static_assert(__is_aggregate(int[2])); +static_assert(__is_aggregate(int[])); +static_assert(!__is_aggregate(void)); +static_assert(!__is_aggregate(decltype(nullptr))); +static_assert(!__is_aggregate(int S::*)); +static_assert(!__is_aggregate(void(S::*)())); +static_assert(!__is_aggregate(Fn)); +static_assert(!__is_aggregate(void (*)())); +static_assert(!__is_aggregate(E)); +static_assert(!__is_aggregate(EC)); +static_assert(__is_aggregate(S)); +static_assert(__is_aggregate(Empty)); +static_assert(__is_aggregate(Final)); +static_assert(!__is_aggregate(Poly)); +static_assert(!__is_aggregate(Virt)); +static_assert(__is_aggregate(Dtor)); +static_assert(__is_aggregate(NoDtor)); +static_assert(__is_aggregate(Agg)); +static_assert(__is_aggregate(U)); +static_assert(!__is_aggregate(NonTriv)); +static_assert(__is_aggregate(Padded)); +static_assert(__is_aggregate(Ref)); +static_assert(__is_arithmetic(int)); +static_assert(__is_arithmetic(const int)); +static_assert(__is_arithmetic(volatile int)); +static_assert(__is_arithmetic(unsigned)); +static_assert(__is_arithmetic(bool)); +static_assert(__is_arithmetic(char)); +static_assert(__is_arithmetic(float)); +static_assert(__is_arithmetic(double)); +static_assert(!__is_arithmetic(int *)); +static_assert(!__is_arithmetic(int &)); +static_assert(!__is_arithmetic(int &&)); +static_assert(!__is_arithmetic(int[2])); +static_assert(!__is_arithmetic(int[])); +static_assert(!__is_arithmetic(void)); +static_assert(!__is_arithmetic(decltype(nullptr))); +static_assert(!__is_arithmetic(int S::*)); +static_assert(!__is_arithmetic(void(S::*)())); +static_assert(!__is_arithmetic(Fn)); +static_assert(!__is_arithmetic(void (*)())); +static_assert(!__is_arithmetic(E)); +static_assert(!__is_arithmetic(EC)); +static_assert(!__is_arithmetic(S)); +static_assert(!__is_arithmetic(Empty)); +static_assert(!__is_arithmetic(Final)); +static_assert(!__is_arithmetic(Poly)); +static_assert(!__is_arithmetic(Virt)); +static_assert(!__is_arithmetic(Dtor)); +static_assert(!__is_arithmetic(NoDtor)); +static_assert(!__is_arithmetic(Agg)); +static_assert(!__is_arithmetic(U)); +static_assert(!__is_arithmetic(NonTriv)); +static_assert(!__is_arithmetic(Padded)); +static_assert(!__is_arithmetic(Ref)); +static_assert(!__is_array(int)); +static_assert(!__is_array(const int)); +static_assert(!__is_array(volatile int)); +static_assert(!__is_array(unsigned)); +static_assert(!__is_array(bool)); +static_assert(!__is_array(char)); +static_assert(!__is_array(float)); +static_assert(!__is_array(double)); +static_assert(!__is_array(int *)); +static_assert(!__is_array(int &)); +static_assert(!__is_array(int &&)); +static_assert(__is_array(int[2])); +static_assert(__is_array(int[])); +static_assert(!__is_array(void)); +static_assert(!__is_array(decltype(nullptr))); +static_assert(!__is_array(int S::*)); +static_assert(!__is_array(void(S::*)())); +static_assert(!__is_array(Fn)); +static_assert(!__is_array(void (*)())); +static_assert(!__is_array(E)); +static_assert(!__is_array(EC)); +static_assert(!__is_array(S)); +static_assert(!__is_array(Empty)); +static_assert(!__is_array(Final)); +static_assert(!__is_array(Poly)); +static_assert(!__is_array(Virt)); +static_assert(!__is_array(Dtor)); +static_assert(!__is_array(NoDtor)); +static_assert(!__is_array(Agg)); +static_assert(!__is_array(U)); +static_assert(!__is_array(NonTriv)); +static_assert(!__is_array(Padded)); +static_assert(!__is_array(Ref)); +static_assert(!__is_bounded_array(int)); +static_assert(!__is_bounded_array(const int)); +static_assert(!__is_bounded_array(volatile int)); +static_assert(!__is_bounded_array(unsigned)); +static_assert(!__is_bounded_array(bool)); +static_assert(!__is_bounded_array(char)); +static_assert(!__is_bounded_array(float)); +static_assert(!__is_bounded_array(double)); +static_assert(!__is_bounded_array(int *)); +static_assert(!__is_bounded_array(int &)); +static_assert(!__is_bounded_array(int &&)); +static_assert(__is_bounded_array(int[2])); +static_assert(!__is_bounded_array(int[])); +static_assert(!__is_bounded_array(void)); +static_assert(!__is_bounded_array(decltype(nullptr))); +static_assert(!__is_bounded_array(int S::*)); +static_assert(!__is_bounded_array(void(S::*)())); +static_assert(!__is_bounded_array(Fn)); +static_assert(!__is_bounded_array(void (*)())); +static_assert(!__is_bounded_array(E)); +static_assert(!__is_bounded_array(EC)); +static_assert(!__is_bounded_array(S)); +static_assert(!__is_bounded_array(Empty)); +static_assert(!__is_bounded_array(Final)); +static_assert(!__is_bounded_array(Poly)); +static_assert(!__is_bounded_array(Virt)); +static_assert(!__is_bounded_array(Dtor)); +static_assert(!__is_bounded_array(NoDtor)); +static_assert(!__is_bounded_array(Agg)); +static_assert(!__is_bounded_array(U)); +static_assert(!__is_bounded_array(NonTriv)); +static_assert(!__is_bounded_array(Padded)); +static_assert(!__is_bounded_array(Ref)); +static_assert(!__is_class(int)); +static_assert(!__is_class(const int)); +static_assert(!__is_class(volatile int)); +static_assert(!__is_class(unsigned)); +static_assert(!__is_class(bool)); +static_assert(!__is_class(char)); +static_assert(!__is_class(float)); +static_assert(!__is_class(double)); +static_assert(!__is_class(int *)); +static_assert(!__is_class(int &)); +static_assert(!__is_class(int &&)); +static_assert(!__is_class(int[2])); +static_assert(!__is_class(int[])); +static_assert(!__is_class(void)); +static_assert(!__is_class(decltype(nullptr))); +static_assert(!__is_class(int S::*)); +static_assert(!__is_class(void(S::*)())); +static_assert(!__is_class(Fn)); +static_assert(!__is_class(void (*)())); +static_assert(!__is_class(E)); +static_assert(!__is_class(EC)); +static_assert(__is_class(S)); +static_assert(__is_class(Empty)); +static_assert(__is_class(Final)); +static_assert(__is_class(Poly)); +static_assert(__is_class(Virt)); +static_assert(__is_class(Dtor)); +static_assert(__is_class(NoDtor)); +static_assert(__is_class(Agg)); +static_assert(!__is_class(U)); +static_assert(__is_class(NonTriv)); +static_assert(__is_class(Padded)); +static_assert(__is_class(Ref)); +static_assert(!__is_compound(int)); +static_assert(!__is_compound(const int)); +static_assert(!__is_compound(volatile int)); +static_assert(!__is_compound(unsigned)); +static_assert(!__is_compound(bool)); +static_assert(!__is_compound(char)); +static_assert(!__is_compound(float)); +static_assert(!__is_compound(double)); +static_assert(__is_compound(int *)); +static_assert(__is_compound(int &)); +static_assert(__is_compound(int &&)); +static_assert(__is_compound(int[2])); +static_assert(__is_compound(int[])); +static_assert(!__is_compound(void)); +static_assert(!__is_compound(decltype(nullptr))); +static_assert(__is_compound(int S::*)); +static_assert(__is_compound(void(S::*)())); +static_assert(__is_compound(Fn)); +static_assert(__is_compound(void (*)())); +static_assert(__is_compound(E)); +static_assert(__is_compound(EC)); +static_assert(__is_compound(S)); +static_assert(__is_compound(Empty)); +static_assert(__is_compound(Final)); +static_assert(__is_compound(Poly)); +static_assert(__is_compound(Virt)); +static_assert(__is_compound(Dtor)); +static_assert(__is_compound(NoDtor)); +static_assert(__is_compound(Agg)); +static_assert(__is_compound(U)); +static_assert(__is_compound(NonTriv)); +static_assert(__is_compound(Padded)); +static_assert(__is_compound(Ref)); +static_assert(!__is_const(int)); +static_assert(__is_const(const int)); +static_assert(!__is_const(volatile int)); +static_assert(!__is_const(unsigned)); +static_assert(!__is_const(bool)); +static_assert(!__is_const(char)); +static_assert(!__is_const(float)); +static_assert(!__is_const(double)); +static_assert(!__is_const(int *)); +static_assert(!__is_const(int &)); +static_assert(!__is_const(int &&)); +static_assert(!__is_const(int[2])); +static_assert(!__is_const(int[])); +static_assert(!__is_const(void)); +static_assert(!__is_const(decltype(nullptr))); +static_assert(!__is_const(int S::*)); +static_assert(!__is_const(void(S::*)())); +static_assert(!__is_const(Fn)); +static_assert(!__is_const(void (*)())); +static_assert(!__is_const(E)); +static_assert(!__is_const(EC)); +static_assert(!__is_const(S)); +static_assert(!__is_const(Empty)); +static_assert(!__is_const(Final)); +static_assert(!__is_const(Poly)); +static_assert(!__is_const(Virt)); +static_assert(!__is_const(Dtor)); +static_assert(!__is_const(NoDtor)); +static_assert(!__is_const(Agg)); +static_assert(!__is_const(U)); +static_assert(!__is_const(NonTriv)); +static_assert(!__is_const(Padded)); +static_assert(!__is_const(Ref)); +static_assert(__is_destructible(int)); +static_assert(__is_destructible(const int)); +static_assert(__is_destructible(volatile int)); +static_assert(__is_destructible(unsigned)); +static_assert(__is_destructible(bool)); +static_assert(__is_destructible(char)); +static_assert(__is_destructible(float)); +static_assert(__is_destructible(double)); +static_assert(__is_destructible(int *)); +static_assert(__is_destructible(int &)); +static_assert(__is_destructible(int &&)); +static_assert(__is_destructible(int[2])); +static_assert(!__is_destructible(int[])); +static_assert(!__is_destructible(void)); +static_assert(__is_destructible(decltype(nullptr))); +static_assert(__is_destructible(int S::*)); +static_assert(__is_destructible(void(S::*)())); +static_assert(!__is_destructible(Fn)); +static_assert(__is_destructible(void (*)())); +static_assert(__is_destructible(E)); +static_assert(__is_destructible(EC)); +static_assert(__is_destructible(S)); +static_assert(__is_destructible(Empty)); +static_assert(__is_destructible(Final)); +static_assert(__is_destructible(Poly)); +static_assert(__is_destructible(Virt)); +static_assert(__is_destructible(Dtor)); +static_assert(!__is_destructible(NoDtor)); +static_assert(__is_destructible(Agg)); +static_assert(__is_destructible(U)); +static_assert(__is_destructible(NonTriv)); +static_assert(__is_destructible(Padded)); +static_assert(__is_destructible(Ref)); +static_assert(!__is_empty(int)); +static_assert(!__is_empty(const int)); +static_assert(!__is_empty(volatile int)); +static_assert(!__is_empty(unsigned)); +static_assert(!__is_empty(bool)); +static_assert(!__is_empty(char)); +static_assert(!__is_empty(float)); +static_assert(!__is_empty(double)); +static_assert(!__is_empty(int *)); +static_assert(!__is_empty(int &)); +static_assert(!__is_empty(int &&)); +static_assert(!__is_empty(int[2])); +static_assert(!__is_empty(int[])); +static_assert(!__is_empty(void)); +static_assert(!__is_empty(decltype(nullptr))); +static_assert(!__is_empty(int S::*)); +static_assert(!__is_empty(void(S::*)())); +static_assert(!__is_empty(Fn)); +static_assert(!__is_empty(void (*)())); +static_assert(!__is_empty(E)); +static_assert(!__is_empty(EC)); +static_assert(!__is_empty(S)); +static_assert(__is_empty(Empty)); +static_assert(!__is_empty(Final)); +static_assert(!__is_empty(Poly)); +static_assert(!__is_empty(Virt)); +static_assert(!__is_empty(Dtor)); +static_assert(__is_empty(NoDtor)); +static_assert(!__is_empty(Agg)); +static_assert(!__is_empty(U)); +static_assert(!__is_empty(NonTriv)); +static_assert(!__is_empty(Padded)); +static_assert(!__is_empty(Ref)); +static_assert(!__is_enum(int)); +static_assert(!__is_enum(const int)); +static_assert(!__is_enum(volatile int)); +static_assert(!__is_enum(unsigned)); +static_assert(!__is_enum(bool)); +static_assert(!__is_enum(char)); +static_assert(!__is_enum(float)); +static_assert(!__is_enum(double)); +static_assert(!__is_enum(int *)); +static_assert(!__is_enum(int &)); +static_assert(!__is_enum(int &&)); +static_assert(!__is_enum(int[2])); +static_assert(!__is_enum(int[])); +static_assert(!__is_enum(void)); +static_assert(!__is_enum(decltype(nullptr))); +static_assert(!__is_enum(int S::*)); +static_assert(!__is_enum(void(S::*)())); +static_assert(!__is_enum(Fn)); +static_assert(!__is_enum(void (*)())); +static_assert(__is_enum(E)); +static_assert(__is_enum(EC)); +static_assert(!__is_enum(S)); +static_assert(!__is_enum(Empty)); +static_assert(!__is_enum(Final)); +static_assert(!__is_enum(Poly)); +static_assert(!__is_enum(Virt)); +static_assert(!__is_enum(Dtor)); +static_assert(!__is_enum(NoDtor)); +static_assert(!__is_enum(Agg)); +static_assert(!__is_enum(U)); +static_assert(!__is_enum(NonTriv)); +static_assert(!__is_enum(Padded)); +static_assert(!__is_enum(Ref)); +static_assert(!__is_final(int)); +static_assert(!__is_final(const int)); +static_assert(!__is_final(volatile int)); +static_assert(!__is_final(unsigned)); +static_assert(!__is_final(bool)); +static_assert(!__is_final(char)); +static_assert(!__is_final(float)); +static_assert(!__is_final(double)); +static_assert(!__is_final(int *)); +static_assert(!__is_final(int &)); +static_assert(!__is_final(int &&)); +static_assert(!__is_final(int[2])); +static_assert(!__is_final(int[])); +static_assert(!__is_final(void)); +static_assert(!__is_final(decltype(nullptr))); +static_assert(!__is_final(int S::*)); +static_assert(!__is_final(void(S::*)())); +static_assert(!__is_final(Fn)); +static_assert(!__is_final(void (*)())); +static_assert(!__is_final(E)); +static_assert(!__is_final(EC)); +static_assert(!__is_final(S)); +static_assert(!__is_final(Empty)); +static_assert(__is_final(Final)); +static_assert(!__is_final(Poly)); +static_assert(!__is_final(Virt)); +static_assert(!__is_final(Dtor)); +static_assert(!__is_final(NoDtor)); +static_assert(!__is_final(Agg)); +static_assert(!__is_final(U)); +static_assert(!__is_final(NonTriv)); +static_assert(!__is_final(Padded)); +static_assert(!__is_final(Ref)); +static_assert(!__is_floating_point(int)); +static_assert(!__is_floating_point(const int)); +static_assert(!__is_floating_point(volatile int)); +static_assert(!__is_floating_point(unsigned)); +static_assert(!__is_floating_point(bool)); +static_assert(!__is_floating_point(char)); +static_assert(__is_floating_point(float)); +static_assert(__is_floating_point(double)); +static_assert(!__is_floating_point(int *)); +static_assert(!__is_floating_point(int &)); +static_assert(!__is_floating_point(int &&)); +static_assert(!__is_floating_point(int[2])); +static_assert(!__is_floating_point(int[])); +static_assert(!__is_floating_point(void)); +static_assert(!__is_floating_point(decltype(nullptr))); +static_assert(!__is_floating_point(int S::*)); +static_assert(!__is_floating_point(void(S::*)())); +static_assert(!__is_floating_point(Fn)); +static_assert(!__is_floating_point(void (*)())); +static_assert(!__is_floating_point(E)); +static_assert(!__is_floating_point(EC)); +static_assert(!__is_floating_point(S)); +static_assert(!__is_floating_point(Empty)); +static_assert(!__is_floating_point(Final)); +static_assert(!__is_floating_point(Poly)); +static_assert(!__is_floating_point(Virt)); +static_assert(!__is_floating_point(Dtor)); +static_assert(!__is_floating_point(NoDtor)); +static_assert(!__is_floating_point(Agg)); +static_assert(!__is_floating_point(U)); +static_assert(!__is_floating_point(NonTriv)); +static_assert(!__is_floating_point(Padded)); +static_assert(!__is_floating_point(Ref)); +static_assert(!__is_function(int)); +static_assert(!__is_function(const int)); +static_assert(!__is_function(volatile int)); +static_assert(!__is_function(unsigned)); +static_assert(!__is_function(bool)); +static_assert(!__is_function(char)); +static_assert(!__is_function(float)); +static_assert(!__is_function(double)); +static_assert(!__is_function(int *)); +static_assert(!__is_function(int &)); +static_assert(!__is_function(int &&)); +static_assert(!__is_function(int[2])); +static_assert(!__is_function(int[])); +static_assert(!__is_function(void)); +static_assert(!__is_function(decltype(nullptr))); +static_assert(!__is_function(int S::*)); +static_assert(!__is_function(void(S::*)())); +static_assert(__is_function(Fn)); +static_assert(!__is_function(void (*)())); +static_assert(!__is_function(E)); +static_assert(!__is_function(EC)); +static_assert(!__is_function(S)); +static_assert(!__is_function(Empty)); +static_assert(!__is_function(Final)); +static_assert(!__is_function(Poly)); +static_assert(!__is_function(Virt)); +static_assert(!__is_function(Dtor)); +static_assert(!__is_function(NoDtor)); +static_assert(!__is_function(Agg)); +static_assert(!__is_function(U)); +static_assert(!__is_function(NonTriv)); +static_assert(!__is_function(Padded)); +static_assert(!__is_function(Ref)); +static_assert(__is_fundamental(int)); +static_assert(__is_fundamental(const int)); +static_assert(__is_fundamental(volatile int)); +static_assert(__is_fundamental(unsigned)); +static_assert(__is_fundamental(bool)); +static_assert(__is_fundamental(char)); +static_assert(__is_fundamental(float)); +static_assert(__is_fundamental(double)); +static_assert(!__is_fundamental(int *)); +static_assert(!__is_fundamental(int &)); +static_assert(!__is_fundamental(int &&)); +static_assert(!__is_fundamental(int[2])); +static_assert(!__is_fundamental(int[])); +static_assert(__is_fundamental(void)); +static_assert(__is_fundamental(decltype(nullptr))); +static_assert(!__is_fundamental(int S::*)); +static_assert(!__is_fundamental(void(S::*)())); +static_assert(!__is_fundamental(Fn)); +static_assert(!__is_fundamental(void (*)())); +static_assert(!__is_fundamental(E)); +static_assert(!__is_fundamental(EC)); +static_assert(!__is_fundamental(S)); +static_assert(!__is_fundamental(Empty)); +static_assert(!__is_fundamental(Final)); +static_assert(!__is_fundamental(Poly)); +static_assert(!__is_fundamental(Virt)); +static_assert(!__is_fundamental(Dtor)); +static_assert(!__is_fundamental(NoDtor)); +static_assert(!__is_fundamental(Agg)); +static_assert(!__is_fundamental(U)); +static_assert(!__is_fundamental(NonTriv)); +static_assert(!__is_fundamental(Padded)); +static_assert(!__is_fundamental(Ref)); +static_assert(__is_integral(int)); +static_assert(__is_integral(const int)); +static_assert(__is_integral(volatile int)); +static_assert(__is_integral(unsigned)); +static_assert(__is_integral(bool)); +static_assert(__is_integral(char)); +static_assert(!__is_integral(float)); +static_assert(!__is_integral(double)); +static_assert(!__is_integral(int *)); +static_assert(!__is_integral(int &)); +static_assert(!__is_integral(int &&)); +static_assert(!__is_integral(int[2])); +static_assert(!__is_integral(int[])); +static_assert(!__is_integral(void)); +static_assert(!__is_integral(decltype(nullptr))); +static_assert(!__is_integral(int S::*)); +static_assert(!__is_integral(void(S::*)())); +static_assert(!__is_integral(Fn)); +static_assert(!__is_integral(void (*)())); +static_assert(!__is_integral(E)); +static_assert(!__is_integral(EC)); +static_assert(!__is_integral(S)); +static_assert(!__is_integral(Empty)); +static_assert(!__is_integral(Final)); +static_assert(!__is_integral(Poly)); +static_assert(!__is_integral(Virt)); +static_assert(!__is_integral(Dtor)); +static_assert(!__is_integral(NoDtor)); +static_assert(!__is_integral(Agg)); +static_assert(!__is_integral(U)); +static_assert(!__is_integral(NonTriv)); +static_assert(!__is_integral(Padded)); +static_assert(!__is_integral(Ref)); +static_assert(__is_literal_type(int)); +static_assert(__is_literal_type(const int)); +static_assert(__is_literal_type(volatile int)); +static_assert(__is_literal_type(unsigned)); +static_assert(__is_literal_type(bool)); +static_assert(__is_literal_type(char)); +static_assert(__is_literal_type(float)); +static_assert(__is_literal_type(double)); +static_assert(__is_literal_type(int *)); +static_assert(__is_literal_type(int &)); +static_assert(__is_literal_type(int &&)); +static_assert(__is_literal_type(int[2])); +static_assert(__is_literal_type(int[])); +static_assert(__is_literal_type(void)); +static_assert(__is_literal_type(decltype(nullptr))); +static_assert(__is_literal_type(int S::*)); +static_assert(__is_literal_type(void(S::*)())); +static_assert(!__is_literal_type(Fn)); +static_assert(__is_literal_type(void (*)())); +static_assert(__is_literal_type(E)); +static_assert(__is_literal_type(EC)); +static_assert(__is_literal_type(S)); +static_assert(__is_literal_type(Empty)); +static_assert(__is_literal_type(Final)); +static_assert(__is_literal_type(Poly)); +static_assert(!__is_literal_type(Virt)); +static_assert(!__is_literal_type(Dtor)); +static_assert(!__is_literal_type(NoDtor)); +static_assert(__is_literal_type(Agg)); +static_assert(__is_literal_type(U)); +static_assert(!__is_literal_type(NonTriv)); +static_assert(__is_literal_type(Padded)); +static_assert(__is_literal_type(Ref)); +static_assert(!__is_lvalue_reference(int)); +static_assert(!__is_lvalue_reference(const int)); +static_assert(!__is_lvalue_reference(volatile int)); +static_assert(!__is_lvalue_reference(unsigned)); +static_assert(!__is_lvalue_reference(bool)); +static_assert(!__is_lvalue_reference(char)); +static_assert(!__is_lvalue_reference(float)); +static_assert(!__is_lvalue_reference(double)); +static_assert(!__is_lvalue_reference(int *)); +static_assert(__is_lvalue_reference(int &)); +static_assert(!__is_lvalue_reference(int &&)); +static_assert(!__is_lvalue_reference(int[2])); +static_assert(!__is_lvalue_reference(int[])); +static_assert(!__is_lvalue_reference(void)); +static_assert(!__is_lvalue_reference(decltype(nullptr))); +static_assert(!__is_lvalue_reference(int S::*)); +static_assert(!__is_lvalue_reference(void(S::*)())); +static_assert(!__is_lvalue_reference(Fn)); +static_assert(!__is_lvalue_reference(void (*)())); +static_assert(!__is_lvalue_reference(E)); +static_assert(!__is_lvalue_reference(EC)); +static_assert(!__is_lvalue_reference(S)); +static_assert(!__is_lvalue_reference(Empty)); +static_assert(!__is_lvalue_reference(Final)); +static_assert(!__is_lvalue_reference(Poly)); +static_assert(!__is_lvalue_reference(Virt)); +static_assert(!__is_lvalue_reference(Dtor)); +static_assert(!__is_lvalue_reference(NoDtor)); +static_assert(!__is_lvalue_reference(Agg)); +static_assert(!__is_lvalue_reference(U)); +static_assert(!__is_lvalue_reference(NonTriv)); +static_assert(!__is_lvalue_reference(Padded)); +static_assert(!__is_lvalue_reference(Ref)); +static_assert(!__is_member_function_pointer(int)); +static_assert(!__is_member_function_pointer(const int)); +static_assert(!__is_member_function_pointer(volatile int)); +static_assert(!__is_member_function_pointer(unsigned)); +static_assert(!__is_member_function_pointer(bool)); +static_assert(!__is_member_function_pointer(char)); +static_assert(!__is_member_function_pointer(float)); +static_assert(!__is_member_function_pointer(double)); +static_assert(!__is_member_function_pointer(int *)); +static_assert(!__is_member_function_pointer(int &)); +static_assert(!__is_member_function_pointer(int &&)); +static_assert(!__is_member_function_pointer(int[2])); +static_assert(!__is_member_function_pointer(int[])); +static_assert(!__is_member_function_pointer(void)); +static_assert(!__is_member_function_pointer(decltype(nullptr))); +static_assert(!__is_member_function_pointer(int S::*)); +static_assert(__is_member_function_pointer(void(S::*)())); +static_assert(!__is_member_function_pointer(Fn)); +static_assert(!__is_member_function_pointer(void (*)())); +static_assert(!__is_member_function_pointer(E)); +static_assert(!__is_member_function_pointer(EC)); +static_assert(!__is_member_function_pointer(S)); +static_assert(!__is_member_function_pointer(Empty)); +static_assert(!__is_member_function_pointer(Final)); +static_assert(!__is_member_function_pointer(Poly)); +static_assert(!__is_member_function_pointer(Virt)); +static_assert(!__is_member_function_pointer(Dtor)); +static_assert(!__is_member_function_pointer(NoDtor)); +static_assert(!__is_member_function_pointer(Agg)); +static_assert(!__is_member_function_pointer(U)); +static_assert(!__is_member_function_pointer(NonTriv)); +static_assert(!__is_member_function_pointer(Padded)); +static_assert(!__is_member_function_pointer(Ref)); +static_assert(!__is_member_object_pointer(int)); +static_assert(!__is_member_object_pointer(const int)); +static_assert(!__is_member_object_pointer(volatile int)); +static_assert(!__is_member_object_pointer(unsigned)); +static_assert(!__is_member_object_pointer(bool)); +static_assert(!__is_member_object_pointer(char)); +static_assert(!__is_member_object_pointer(float)); +static_assert(!__is_member_object_pointer(double)); +static_assert(!__is_member_object_pointer(int *)); +static_assert(!__is_member_object_pointer(int &)); +static_assert(!__is_member_object_pointer(int &&)); +static_assert(!__is_member_object_pointer(int[2])); +static_assert(!__is_member_object_pointer(int[])); +static_assert(!__is_member_object_pointer(void)); +static_assert(!__is_member_object_pointer(decltype(nullptr))); +static_assert(__is_member_object_pointer(int S::*)); +static_assert(!__is_member_object_pointer(void(S::*)())); +static_assert(!__is_member_object_pointer(Fn)); +static_assert(!__is_member_object_pointer(void (*)())); +static_assert(!__is_member_object_pointer(E)); +static_assert(!__is_member_object_pointer(EC)); +static_assert(!__is_member_object_pointer(S)); +static_assert(!__is_member_object_pointer(Empty)); +static_assert(!__is_member_object_pointer(Final)); +static_assert(!__is_member_object_pointer(Poly)); +static_assert(!__is_member_object_pointer(Virt)); +static_assert(!__is_member_object_pointer(Dtor)); +static_assert(!__is_member_object_pointer(NoDtor)); +static_assert(!__is_member_object_pointer(Agg)); +static_assert(!__is_member_object_pointer(U)); +static_assert(!__is_member_object_pointer(NonTriv)); +static_assert(!__is_member_object_pointer(Padded)); +static_assert(!__is_member_object_pointer(Ref)); +static_assert(!__is_member_pointer(int)); +static_assert(!__is_member_pointer(const int)); +static_assert(!__is_member_pointer(volatile int)); +static_assert(!__is_member_pointer(unsigned)); +static_assert(!__is_member_pointer(bool)); +static_assert(!__is_member_pointer(char)); +static_assert(!__is_member_pointer(float)); +static_assert(!__is_member_pointer(double)); +static_assert(!__is_member_pointer(int *)); +static_assert(!__is_member_pointer(int &)); +static_assert(!__is_member_pointer(int &&)); +static_assert(!__is_member_pointer(int[2])); +static_assert(!__is_member_pointer(int[])); +static_assert(!__is_member_pointer(void)); +static_assert(!__is_member_pointer(decltype(nullptr))); +static_assert(__is_member_pointer(int S::*)); +static_assert(__is_member_pointer(void(S::*)())); +static_assert(!__is_member_pointer(Fn)); +static_assert(!__is_member_pointer(void (*)())); +static_assert(!__is_member_pointer(E)); +static_assert(!__is_member_pointer(EC)); +static_assert(!__is_member_pointer(S)); +static_assert(!__is_member_pointer(Empty)); +static_assert(!__is_member_pointer(Final)); +static_assert(!__is_member_pointer(Poly)); +static_assert(!__is_member_pointer(Virt)); +static_assert(!__is_member_pointer(Dtor)); +static_assert(!__is_member_pointer(NoDtor)); +static_assert(!__is_member_pointer(Agg)); +static_assert(!__is_member_pointer(U)); +static_assert(!__is_member_pointer(NonTriv)); +static_assert(!__is_member_pointer(Padded)); +static_assert(!__is_member_pointer(Ref)); +static_assert(__is_nothrow_destructible(int)); +static_assert(__is_nothrow_destructible(const int)); +static_assert(__is_nothrow_destructible(volatile int)); +static_assert(__is_nothrow_destructible(unsigned)); +static_assert(__is_nothrow_destructible(bool)); +static_assert(__is_nothrow_destructible(char)); +static_assert(__is_nothrow_destructible(float)); +static_assert(__is_nothrow_destructible(double)); +static_assert(__is_nothrow_destructible(int *)); +static_assert(__is_nothrow_destructible(int &)); +static_assert(__is_nothrow_destructible(int &&)); +static_assert(__is_nothrow_destructible(int[2])); +static_assert(!__is_nothrow_destructible(int[])); +static_assert(!__is_nothrow_destructible(void)); +static_assert(__is_nothrow_destructible(decltype(nullptr))); +static_assert(__is_nothrow_destructible(int S::*)); +static_assert(__is_nothrow_destructible(void(S::*)())); +static_assert(!__is_nothrow_destructible(Fn)); +static_assert(__is_nothrow_destructible(void (*)())); +static_assert(__is_nothrow_destructible(E)); +static_assert(__is_nothrow_destructible(EC)); +static_assert(__is_nothrow_destructible(S)); +static_assert(__is_nothrow_destructible(Empty)); +static_assert(__is_nothrow_destructible(Final)); +static_assert(__is_nothrow_destructible(Poly)); +static_assert(__is_nothrow_destructible(Virt)); +static_assert(__is_nothrow_destructible(Dtor)); +static_assert(!__is_nothrow_destructible(NoDtor)); +static_assert(__is_nothrow_destructible(Agg)); +static_assert(__is_nothrow_destructible(U)); +static_assert(__is_nothrow_destructible(NonTriv)); +static_assert(__is_nothrow_destructible(Padded)); +static_assert(__is_nothrow_destructible(Ref)); +static_assert(__is_object(int)); +static_assert(__is_object(const int)); +static_assert(__is_object(volatile int)); +static_assert(__is_object(unsigned)); +static_assert(__is_object(bool)); +static_assert(__is_object(char)); +static_assert(__is_object(float)); +static_assert(__is_object(double)); +static_assert(__is_object(int *)); +static_assert(!__is_object(int &)); +static_assert(!__is_object(int &&)); +static_assert(__is_object(int[2])); +static_assert(__is_object(int[])); +static_assert(!__is_object(void)); +static_assert(__is_object(decltype(nullptr))); +static_assert(__is_object(int S::*)); +static_assert(__is_object(void(S::*)())); +static_assert(!__is_object(Fn)); +static_assert(__is_object(void (*)())); +static_assert(__is_object(E)); +static_assert(__is_object(EC)); +static_assert(__is_object(S)); +static_assert(__is_object(Empty)); +static_assert(__is_object(Final)); +static_assert(__is_object(Poly)); +static_assert(__is_object(Virt)); +static_assert(__is_object(Dtor)); +static_assert(__is_object(NoDtor)); +static_assert(__is_object(Agg)); +static_assert(__is_object(U)); +static_assert(__is_object(NonTriv)); +static_assert(__is_object(Padded)); +static_assert(__is_object(Ref)); +static_assert(__is_pod(int)); +static_assert(__is_pod(const int)); +static_assert(__is_pod(volatile int)); +static_assert(__is_pod(unsigned)); +static_assert(__is_pod(bool)); +static_assert(__is_pod(char)); +static_assert(__is_pod(float)); +static_assert(__is_pod(double)); +static_assert(__is_pod(int *)); +static_assert(!__is_pod(int &)); +static_assert(!__is_pod(int &&)); +static_assert(__is_pod(int[2])); +static_assert(__is_pod(int[])); +static_assert(!__is_pod(void)); +static_assert(__is_pod(decltype(nullptr))); +static_assert(__is_pod(int S::*)); +static_assert(__is_pod(void(S::*)())); +static_assert(!__is_pod(Fn)); +static_assert(__is_pod(void (*)())); +static_assert(__is_pod(E)); +static_assert(__is_pod(EC)); +static_assert(__is_pod(S)); +static_assert(__is_pod(Empty)); +static_assert(__is_pod(Final)); +static_assert(!__is_pod(Poly)); +static_assert(!__is_pod(Virt)); +static_assert(!__is_pod(Dtor)); +static_assert(__is_pod(Agg)); +static_assert(__is_pod(U)); +static_assert(!__is_pod(NonTriv)); +static_assert(__is_pod(Padded)); +static_assert(!__is_pod(Ref)); +static_assert(!__is_pointer(int)); +static_assert(!__is_pointer(const int)); +static_assert(!__is_pointer(volatile int)); +static_assert(!__is_pointer(unsigned)); +static_assert(!__is_pointer(bool)); +static_assert(!__is_pointer(char)); +static_assert(!__is_pointer(float)); +static_assert(!__is_pointer(double)); +static_assert(__is_pointer(int *)); +static_assert(!__is_pointer(int &)); +static_assert(!__is_pointer(int &&)); +static_assert(!__is_pointer(int[2])); +static_assert(!__is_pointer(int[])); +static_assert(!__is_pointer(void)); +static_assert(!__is_pointer(decltype(nullptr))); +static_assert(!__is_pointer(int S::*)); +static_assert(!__is_pointer(void(S::*)())); +static_assert(!__is_pointer(Fn)); +static_assert(__is_pointer(void (*)())); +static_assert(!__is_pointer(E)); +static_assert(!__is_pointer(EC)); +static_assert(!__is_pointer(S)); +static_assert(!__is_pointer(Empty)); +static_assert(!__is_pointer(Final)); +static_assert(!__is_pointer(Poly)); +static_assert(!__is_pointer(Virt)); +static_assert(!__is_pointer(Dtor)); +static_assert(!__is_pointer(NoDtor)); +static_assert(!__is_pointer(Agg)); +static_assert(!__is_pointer(U)); +static_assert(!__is_pointer(NonTriv)); +static_assert(!__is_pointer(Padded)); +static_assert(!__is_pointer(Ref)); +static_assert(!__is_polymorphic(int)); +static_assert(!__is_polymorphic(const int)); +static_assert(!__is_polymorphic(volatile int)); +static_assert(!__is_polymorphic(unsigned)); +static_assert(!__is_polymorphic(bool)); +static_assert(!__is_polymorphic(char)); +static_assert(!__is_polymorphic(float)); +static_assert(!__is_polymorphic(double)); +static_assert(!__is_polymorphic(int *)); +static_assert(!__is_polymorphic(int &)); +static_assert(!__is_polymorphic(int &&)); +static_assert(!__is_polymorphic(int[2])); +static_assert(!__is_polymorphic(int[])); +static_assert(!__is_polymorphic(void)); +static_assert(!__is_polymorphic(decltype(nullptr))); +static_assert(!__is_polymorphic(int S::*)); +static_assert(!__is_polymorphic(void(S::*)())); +static_assert(!__is_polymorphic(Fn)); +static_assert(!__is_polymorphic(void (*)())); +static_assert(!__is_polymorphic(E)); +static_assert(!__is_polymorphic(EC)); +static_assert(!__is_polymorphic(S)); +static_assert(!__is_polymorphic(Empty)); +static_assert(!__is_polymorphic(Final)); +static_assert(__is_polymorphic(Poly)); +static_assert(__is_polymorphic(Virt)); +static_assert(!__is_polymorphic(Dtor)); +static_assert(!__is_polymorphic(NoDtor)); +static_assert(!__is_polymorphic(Agg)); +static_assert(!__is_polymorphic(U)); +static_assert(!__is_polymorphic(NonTriv)); +static_assert(!__is_polymorphic(Padded)); +static_assert(!__is_polymorphic(Ref)); +static_assert(!__is_reference(int)); +static_assert(!__is_reference(const int)); +static_assert(!__is_reference(volatile int)); +static_assert(!__is_reference(unsigned)); +static_assert(!__is_reference(bool)); +static_assert(!__is_reference(char)); +static_assert(!__is_reference(float)); +static_assert(!__is_reference(double)); +static_assert(!__is_reference(int *)); +static_assert(__is_reference(int &)); +static_assert(__is_reference(int &&)); +static_assert(!__is_reference(int[2])); +static_assert(!__is_reference(int[])); +static_assert(!__is_reference(void)); +static_assert(!__is_reference(decltype(nullptr))); +static_assert(!__is_reference(int S::*)); +static_assert(!__is_reference(void(S::*)())); +static_assert(!__is_reference(Fn)); +static_assert(!__is_reference(void (*)())); +static_assert(!__is_reference(E)); +static_assert(!__is_reference(EC)); +static_assert(!__is_reference(S)); +static_assert(!__is_reference(Empty)); +static_assert(!__is_reference(Final)); +static_assert(!__is_reference(Poly)); +static_assert(!__is_reference(Virt)); +static_assert(!__is_reference(Dtor)); +static_assert(!__is_reference(NoDtor)); +static_assert(!__is_reference(Agg)); +static_assert(!__is_reference(U)); +static_assert(!__is_reference(NonTriv)); +static_assert(!__is_reference(Padded)); +static_assert(!__is_reference(Ref)); +static_assert(__is_referenceable(int)); +static_assert(__is_referenceable(const int)); +static_assert(__is_referenceable(volatile int)); +static_assert(__is_referenceable(unsigned)); +static_assert(__is_referenceable(bool)); +static_assert(__is_referenceable(char)); +static_assert(__is_referenceable(float)); +static_assert(__is_referenceable(double)); +static_assert(__is_referenceable(int *)); +static_assert(__is_referenceable(int &)); +static_assert(__is_referenceable(int &&)); +static_assert(__is_referenceable(int[2])); +static_assert(__is_referenceable(int[])); +static_assert(!__is_referenceable(void)); +static_assert(__is_referenceable(decltype(nullptr))); +static_assert(__is_referenceable(int S::*)); +static_assert(__is_referenceable(void(S::*)())); +static_assert(__is_referenceable(Fn)); +static_assert(__is_referenceable(void (*)())); +static_assert(__is_referenceable(E)); +static_assert(__is_referenceable(EC)); +static_assert(__is_referenceable(S)); +static_assert(__is_referenceable(Empty)); +static_assert(__is_referenceable(Final)); +static_assert(__is_referenceable(Poly)); +static_assert(__is_referenceable(Virt)); +static_assert(__is_referenceable(Dtor)); +static_assert(__is_referenceable(NoDtor)); +static_assert(__is_referenceable(Agg)); +static_assert(__is_referenceable(U)); +static_assert(__is_referenceable(NonTriv)); +static_assert(__is_referenceable(Padded)); +static_assert(__is_referenceable(Ref)); +static_assert(!__is_rvalue_reference(int)); +static_assert(!__is_rvalue_reference(const int)); +static_assert(!__is_rvalue_reference(volatile int)); +static_assert(!__is_rvalue_reference(unsigned)); +static_assert(!__is_rvalue_reference(bool)); +static_assert(!__is_rvalue_reference(char)); +static_assert(!__is_rvalue_reference(float)); +static_assert(!__is_rvalue_reference(double)); +static_assert(!__is_rvalue_reference(int *)); +static_assert(!__is_rvalue_reference(int &)); +static_assert(__is_rvalue_reference(int &&)); +static_assert(!__is_rvalue_reference(int[2])); +static_assert(!__is_rvalue_reference(int[])); +static_assert(!__is_rvalue_reference(void)); +static_assert(!__is_rvalue_reference(decltype(nullptr))); +static_assert(!__is_rvalue_reference(int S::*)); +static_assert(!__is_rvalue_reference(void(S::*)())); +static_assert(!__is_rvalue_reference(Fn)); +static_assert(!__is_rvalue_reference(void (*)())); +static_assert(!__is_rvalue_reference(E)); +static_assert(!__is_rvalue_reference(EC)); +static_assert(!__is_rvalue_reference(S)); +static_assert(!__is_rvalue_reference(Empty)); +static_assert(!__is_rvalue_reference(Final)); +static_assert(!__is_rvalue_reference(Poly)); +static_assert(!__is_rvalue_reference(Virt)); +static_assert(!__is_rvalue_reference(Dtor)); +static_assert(!__is_rvalue_reference(NoDtor)); +static_assert(!__is_rvalue_reference(Agg)); +static_assert(!__is_rvalue_reference(U)); +static_assert(!__is_rvalue_reference(NonTriv)); +static_assert(!__is_rvalue_reference(Padded)); +static_assert(!__is_rvalue_reference(Ref)); +static_assert(__is_scalar(int)); +static_assert(__is_scalar(const int)); +static_assert(__is_scalar(volatile int)); +static_assert(__is_scalar(unsigned)); +static_assert(__is_scalar(bool)); +static_assert(__is_scalar(char)); +static_assert(__is_scalar(float)); +static_assert(__is_scalar(double)); +static_assert(__is_scalar(int *)); +static_assert(!__is_scalar(int &)); +static_assert(!__is_scalar(int &&)); +static_assert(!__is_scalar(int[2])); +static_assert(!__is_scalar(int[])); +static_assert(!__is_scalar(void)); +static_assert(__is_scalar(decltype(nullptr))); +static_assert(__is_scalar(int S::*)); +static_assert(__is_scalar(void(S::*)())); +static_assert(!__is_scalar(Fn)); +static_assert(__is_scalar(void (*)())); +static_assert(__is_scalar(E)); +static_assert(__is_scalar(EC)); +static_assert(!__is_scalar(S)); +static_assert(!__is_scalar(Empty)); +static_assert(!__is_scalar(Final)); +static_assert(!__is_scalar(Poly)); +static_assert(!__is_scalar(Virt)); +static_assert(!__is_scalar(Dtor)); +static_assert(!__is_scalar(NoDtor)); +static_assert(!__is_scalar(Agg)); +static_assert(!__is_scalar(U)); +static_assert(!__is_scalar(NonTriv)); +static_assert(!__is_scalar(Padded)); +static_assert(!__is_scalar(Ref)); +static_assert(!__is_scoped_enum(int)); +static_assert(!__is_scoped_enum(const int)); +static_assert(!__is_scoped_enum(volatile int)); +static_assert(!__is_scoped_enum(unsigned)); +static_assert(!__is_scoped_enum(bool)); +static_assert(!__is_scoped_enum(char)); +static_assert(!__is_scoped_enum(float)); +static_assert(!__is_scoped_enum(double)); +static_assert(!__is_scoped_enum(int *)); +static_assert(!__is_scoped_enum(int &)); +static_assert(!__is_scoped_enum(int &&)); +static_assert(!__is_scoped_enum(int[2])); +static_assert(!__is_scoped_enum(int[])); +static_assert(!__is_scoped_enum(void)); +static_assert(!__is_scoped_enum(decltype(nullptr))); +static_assert(!__is_scoped_enum(int S::*)); +static_assert(!__is_scoped_enum(void(S::*)())); +static_assert(!__is_scoped_enum(Fn)); +static_assert(!__is_scoped_enum(void (*)())); +static_assert(!__is_scoped_enum(E)); +static_assert(__is_scoped_enum(EC)); +static_assert(!__is_scoped_enum(S)); +static_assert(!__is_scoped_enum(Empty)); +static_assert(!__is_scoped_enum(Final)); +static_assert(!__is_scoped_enum(Poly)); +static_assert(!__is_scoped_enum(Virt)); +static_assert(!__is_scoped_enum(Dtor)); +static_assert(!__is_scoped_enum(NoDtor)); +static_assert(!__is_scoped_enum(Agg)); +static_assert(!__is_scoped_enum(U)); +static_assert(!__is_scoped_enum(NonTriv)); +static_assert(!__is_scoped_enum(Padded)); +static_assert(!__is_scoped_enum(Ref)); +static_assert(__is_signed(int)); +static_assert(__is_signed(const int)); +static_assert(__is_signed(volatile int)); +static_assert(!__is_signed(unsigned)); +static_assert(!__is_signed(bool)); +static_assert(__is_signed(char) == (char(-1) < 0)); // unsigned on aarch64 +static_assert(__is_signed(float)); +static_assert(__is_signed(double)); +static_assert(!__is_signed(int *)); +static_assert(!__is_signed(int &)); +static_assert(!__is_signed(int &&)); +static_assert(!__is_signed(int[2])); +static_assert(!__is_signed(int[])); +static_assert(!__is_signed(void)); +static_assert(!__is_signed(decltype(nullptr))); +static_assert(!__is_signed(int S::*)); +static_assert(!__is_signed(void(S::*)())); +static_assert(!__is_signed(Fn)); +static_assert(!__is_signed(void (*)())); +static_assert(!__is_signed(E)); +static_assert(!__is_signed(EC)); +static_assert(!__is_signed(S)); +static_assert(!__is_signed(Empty)); +static_assert(!__is_signed(Final)); +static_assert(!__is_signed(Poly)); +static_assert(!__is_signed(Virt)); +static_assert(!__is_signed(Dtor)); +static_assert(!__is_signed(NoDtor)); +static_assert(!__is_signed(Agg)); +static_assert(!__is_signed(U)); +static_assert(!__is_signed(NonTriv)); +static_assert(!__is_signed(Padded)); +static_assert(!__is_signed(Ref)); +static_assert(__is_standard_layout(int)); +static_assert(__is_standard_layout(const int)); +static_assert(__is_standard_layout(volatile int)); +static_assert(__is_standard_layout(unsigned)); +static_assert(__is_standard_layout(bool)); +static_assert(__is_standard_layout(char)); +static_assert(__is_standard_layout(float)); +static_assert(__is_standard_layout(double)); +static_assert(__is_standard_layout(int *)); +static_assert(!__is_standard_layout(int &)); +static_assert(!__is_standard_layout(int &&)); +static_assert(__is_standard_layout(int[2])); +static_assert(__is_standard_layout(int[])); +static_assert(!__is_standard_layout(void)); +static_assert(__is_standard_layout(decltype(nullptr))); +static_assert(__is_standard_layout(int S::*)); +static_assert(__is_standard_layout(void(S::*)())); +static_assert(!__is_standard_layout(Fn)); +static_assert(__is_standard_layout(void (*)())); +static_assert(__is_standard_layout(E)); +static_assert(__is_standard_layout(EC)); +static_assert(__is_standard_layout(S)); +static_assert(__is_standard_layout(Empty)); +static_assert(__is_standard_layout(Final)); +static_assert(!__is_standard_layout(Poly)); +static_assert(!__is_standard_layout(Virt)); +static_assert(__is_standard_layout(Dtor)); +static_assert(__is_standard_layout(NoDtor)); +static_assert(__is_standard_layout(Agg)); +static_assert(__is_standard_layout(U)); +static_assert(__is_standard_layout(NonTriv)); +static_assert(__is_standard_layout(Padded)); +static_assert(!__is_standard_layout(Ref)); +static_assert(__is_trivial(int)); +static_assert(__is_trivial(const int)); +static_assert(__is_trivial(volatile int)); +static_assert(__is_trivial(unsigned)); +static_assert(__is_trivial(bool)); +static_assert(__is_trivial(char)); +static_assert(__is_trivial(float)); +static_assert(__is_trivial(double)); +static_assert(__is_trivial(int *)); +static_assert(!__is_trivial(int &)); +static_assert(!__is_trivial(int &&)); +static_assert(__is_trivial(int[2])); +static_assert(__is_trivial(int[])); +static_assert(!__is_trivial(void)); +static_assert(__is_trivial(decltype(nullptr))); +static_assert(__is_trivial(int S::*)); +static_assert(__is_trivial(void(S::*)())); +static_assert(!__is_trivial(Fn)); +static_assert(__is_trivial(void (*)())); +static_assert(__is_trivial(E)); +static_assert(__is_trivial(EC)); +static_assert(__is_trivial(S)); +static_assert(__is_trivial(Empty)); +static_assert(__is_trivial(Final)); +static_assert(!__is_trivial(Poly)); +static_assert(!__is_trivial(Virt)); +static_assert(!__is_trivial(Dtor)); +static_assert(__is_trivial(Agg)); +static_assert(__is_trivial(U)); +static_assert(!__is_trivial(NonTriv)); +static_assert(__is_trivial(Padded)); +static_assert(__is_trivially_copyable(int)); +static_assert(__is_trivially_copyable(const int)); +static_assert(__is_trivially_copyable(volatile int)); +static_assert(__is_trivially_copyable(unsigned)); +static_assert(__is_trivially_copyable(bool)); +static_assert(__is_trivially_copyable(char)); +static_assert(__is_trivially_copyable(float)); +static_assert(__is_trivially_copyable(double)); +static_assert(__is_trivially_copyable(int *)); +static_assert(!__is_trivially_copyable(int &)); +static_assert(!__is_trivially_copyable(int &&)); +static_assert(__is_trivially_copyable(int[2])); +static_assert(__is_trivially_copyable(int[])); +static_assert(!__is_trivially_copyable(void)); +static_assert(__is_trivially_copyable(decltype(nullptr))); +static_assert(__is_trivially_copyable(int S::*)); +static_assert(__is_trivially_copyable(void(S::*)())); +static_assert(!__is_trivially_copyable(Fn)); +static_assert(__is_trivially_copyable(void (*)())); +static_assert(__is_trivially_copyable(E)); +static_assert(__is_trivially_copyable(EC)); +static_assert(__is_trivially_copyable(S)); +static_assert(__is_trivially_copyable(Empty)); +static_assert(__is_trivially_copyable(Final)); +static_assert(!__is_trivially_copyable(Poly)); +static_assert(!__is_trivially_copyable(Virt)); +static_assert(!__is_trivially_copyable(Dtor)); +static_assert(__is_trivially_copyable(Agg)); +static_assert(__is_trivially_copyable(U)); +static_assert(!__is_trivially_copyable(NonTriv)); +static_assert(__is_trivially_copyable(Padded)); +static_assert(__is_trivially_copyable(Ref)); +static_assert(__is_trivially_destructible(int)); +static_assert(__is_trivially_destructible(const int)); +static_assert(__is_trivially_destructible(volatile int)); +static_assert(__is_trivially_destructible(unsigned)); +static_assert(__is_trivially_destructible(bool)); +static_assert(__is_trivially_destructible(char)); +static_assert(__is_trivially_destructible(float)); +static_assert(__is_trivially_destructible(double)); +static_assert(__is_trivially_destructible(int *)); +static_assert(__is_trivially_destructible(int &)); +static_assert(__is_trivially_destructible(int &&)); +static_assert(__is_trivially_destructible(int[2])); +static_assert(!__is_trivially_destructible(int[])); +static_assert(!__is_trivially_destructible(void)); +static_assert(__is_trivially_destructible(decltype(nullptr))); +static_assert(__is_trivially_destructible(int S::*)); +static_assert(__is_trivially_destructible(void(S::*)())); +static_assert(!__is_trivially_destructible(Fn)); +static_assert(__is_trivially_destructible(void (*)())); +static_assert(__is_trivially_destructible(E)); +static_assert(__is_trivially_destructible(EC)); +static_assert(__is_trivially_destructible(S)); +static_assert(__is_trivially_destructible(Empty)); +static_assert(__is_trivially_destructible(Final)); +static_assert(__is_trivially_destructible(Poly)); +static_assert(!__is_trivially_destructible(Virt)); +static_assert(!__is_trivially_destructible(Dtor)); +static_assert(!__is_trivially_destructible(NoDtor)); +static_assert(__is_trivially_destructible(Agg)); +static_assert(__is_trivially_destructible(U)); +static_assert(__is_trivially_destructible(NonTriv)); +static_assert(__is_trivially_destructible(Padded)); +static_assert(__is_trivially_destructible(Ref)); +static_assert(__is_trivially_equality_comparable(int)); +static_assert(__is_trivially_equality_comparable(const int)); +static_assert(__is_trivially_equality_comparable(volatile int)); +static_assert(__is_trivially_equality_comparable(unsigned)); +static_assert(__is_trivially_equality_comparable(bool)); +static_assert(__is_trivially_equality_comparable(char)); +static_assert(!__is_trivially_equality_comparable(float)); +static_assert(!__is_trivially_equality_comparable(double)); +static_assert(__is_trivially_equality_comparable(int *)); +static_assert(!__is_trivially_equality_comparable(int &)); +static_assert(!__is_trivially_equality_comparable(int &&)); +static_assert(!__is_trivially_equality_comparable(int[2])); +static_assert(!__is_trivially_equality_comparable(int[])); +static_assert(!__is_trivially_equality_comparable(void)); +static_assert(!__is_trivially_equality_comparable(decltype(nullptr))); +static_assert(__is_trivially_equality_comparable(int S::*)); +static_assert(__is_trivially_equality_comparable(void(S::*)())); +static_assert(!__is_trivially_equality_comparable(Fn)); +static_assert(__is_trivially_equality_comparable(void (*)())); +static_assert(!__is_trivially_equality_comparable(E)); +static_assert(!__is_trivially_equality_comparable(EC)); +static_assert(!__is_trivially_equality_comparable(S)); +static_assert(!__is_trivially_equality_comparable(Empty)); +static_assert(!__is_trivially_equality_comparable(Final)); +static_assert(!__is_trivially_equality_comparable(Poly)); +static_assert(!__is_trivially_equality_comparable(Virt)); +static_assert(!__is_trivially_equality_comparable(Dtor)); +static_assert(!__is_trivially_equality_comparable(NoDtor)); +static_assert(!__is_trivially_equality_comparable(Agg)); +static_assert(!__is_trivially_equality_comparable(U)); +static_assert(!__is_trivially_equality_comparable(NonTriv)); +static_assert(!__is_trivially_equality_comparable(Padded)); +static_assert(!__is_trivially_equality_comparable(Ref)); +static_assert(__is_trivially_relocatable(int)); +static_assert(__is_trivially_relocatable(const int)); +static_assert(!__is_trivially_relocatable(volatile int)); +static_assert(__is_trivially_relocatable(unsigned)); +static_assert(__is_trivially_relocatable(bool)); +static_assert(__is_trivially_relocatable(char)); +static_assert(__is_trivially_relocatable(float)); +static_assert(__is_trivially_relocatable(double)); +static_assert(__is_trivially_relocatable(int *)); +static_assert(!__is_trivially_relocatable(int &)); +static_assert(!__is_trivially_relocatable(int &&)); +static_assert(__is_trivially_relocatable(int[2])); +static_assert(__is_trivially_relocatable(int[])); +static_assert(!__is_trivially_relocatable(void)); +static_assert(__is_trivially_relocatable(decltype(nullptr))); +static_assert(__is_trivially_relocatable(int S::*)); +static_assert(__is_trivially_relocatable(void(S::*)())); +static_assert(!__is_trivially_relocatable(Fn)); +static_assert(__is_trivially_relocatable(void (*)())); +static_assert(__is_trivially_relocatable(E)); +static_assert(__is_trivially_relocatable(EC)); +static_assert(__is_trivially_relocatable(S)); +static_assert(__is_trivially_relocatable(Empty)); +static_assert(__is_trivially_relocatable(Final)); +static_assert(!__is_trivially_relocatable(Poly)); +static_assert(!__is_trivially_relocatable(Virt)); +static_assert(!__is_trivially_relocatable(Dtor)); +static_assert(__is_trivially_relocatable(NoDtor)); +static_assert(__is_trivially_relocatable(Agg)); +static_assert(__is_trivially_relocatable(U)); +static_assert(!__is_trivially_relocatable(NonTriv)); +static_assert(__is_trivially_relocatable(Padded)); +static_assert(__is_trivially_relocatable(Ref)); +static_assert(!__is_unbounded_array(int)); +static_assert(!__is_unbounded_array(const int)); +static_assert(!__is_unbounded_array(volatile int)); +static_assert(!__is_unbounded_array(unsigned)); +static_assert(!__is_unbounded_array(bool)); +static_assert(!__is_unbounded_array(char)); +static_assert(!__is_unbounded_array(float)); +static_assert(!__is_unbounded_array(double)); +static_assert(!__is_unbounded_array(int *)); +static_assert(!__is_unbounded_array(int &)); +static_assert(!__is_unbounded_array(int &&)); +static_assert(!__is_unbounded_array(int[2])); +static_assert(__is_unbounded_array(int[])); +static_assert(!__is_unbounded_array(void)); +static_assert(!__is_unbounded_array(decltype(nullptr))); +static_assert(!__is_unbounded_array(int S::*)); +static_assert(!__is_unbounded_array(void(S::*)())); +static_assert(!__is_unbounded_array(Fn)); +static_assert(!__is_unbounded_array(void (*)())); +static_assert(!__is_unbounded_array(E)); +static_assert(!__is_unbounded_array(EC)); +static_assert(!__is_unbounded_array(S)); +static_assert(!__is_unbounded_array(Empty)); +static_assert(!__is_unbounded_array(Final)); +static_assert(!__is_unbounded_array(Poly)); +static_assert(!__is_unbounded_array(Virt)); +static_assert(!__is_unbounded_array(Dtor)); +static_assert(!__is_unbounded_array(NoDtor)); +static_assert(!__is_unbounded_array(Agg)); +static_assert(!__is_unbounded_array(U)); +static_assert(!__is_unbounded_array(NonTriv)); +static_assert(!__is_unbounded_array(Padded)); +static_assert(!__is_unbounded_array(Ref)); +static_assert(!__is_union(int)); +static_assert(!__is_union(const int)); +static_assert(!__is_union(volatile int)); +static_assert(!__is_union(unsigned)); +static_assert(!__is_union(bool)); +static_assert(!__is_union(char)); +static_assert(!__is_union(float)); +static_assert(!__is_union(double)); +static_assert(!__is_union(int *)); +static_assert(!__is_union(int &)); +static_assert(!__is_union(int &&)); +static_assert(!__is_union(int[2])); +static_assert(!__is_union(int[])); +static_assert(!__is_union(void)); +static_assert(!__is_union(decltype(nullptr))); +static_assert(!__is_union(int S::*)); +static_assert(!__is_union(void(S::*)())); +static_assert(!__is_union(Fn)); +static_assert(!__is_union(void (*)())); +static_assert(!__is_union(E)); +static_assert(!__is_union(EC)); +static_assert(!__is_union(S)); +static_assert(!__is_union(Empty)); +static_assert(!__is_union(Final)); +static_assert(!__is_union(Poly)); +static_assert(!__is_union(Virt)); +static_assert(!__is_union(Dtor)); +static_assert(!__is_union(NoDtor)); +static_assert(!__is_union(Agg)); +static_assert(__is_union(U)); +static_assert(!__is_union(NonTriv)); +static_assert(!__is_union(Padded)); +static_assert(!__is_union(Ref)); +static_assert(!__is_unsigned(int)); +static_assert(!__is_unsigned(const int)); +static_assert(!__is_unsigned(volatile int)); +static_assert(__is_unsigned(unsigned)); +static_assert(__is_unsigned(bool)); +static_assert(__is_unsigned(char) == !(char(-1) < 0)); +static_assert(!__is_unsigned(float)); +static_assert(!__is_unsigned(double)); +static_assert(!__is_unsigned(int *)); +static_assert(!__is_unsigned(int &)); +static_assert(!__is_unsigned(int &&)); +static_assert(!__is_unsigned(int[2])); +static_assert(!__is_unsigned(int[])); +static_assert(!__is_unsigned(void)); +static_assert(!__is_unsigned(decltype(nullptr))); +static_assert(!__is_unsigned(int S::*)); +static_assert(!__is_unsigned(void(S::*)())); +static_assert(!__is_unsigned(Fn)); +static_assert(!__is_unsigned(void (*)())); +static_assert(!__is_unsigned(E)); +static_assert(!__is_unsigned(EC)); +static_assert(!__is_unsigned(S)); +static_assert(!__is_unsigned(Empty)); +static_assert(!__is_unsigned(Final)); +static_assert(!__is_unsigned(Poly)); +static_assert(!__is_unsigned(Virt)); +static_assert(!__is_unsigned(Dtor)); +static_assert(!__is_unsigned(NoDtor)); +static_assert(!__is_unsigned(Agg)); +static_assert(!__is_unsigned(U)); +static_assert(!__is_unsigned(NonTriv)); +static_assert(!__is_unsigned(Padded)); +static_assert(!__is_unsigned(Ref)); +static_assert(!__is_void(int)); +static_assert(!__is_void(const int)); +static_assert(!__is_void(volatile int)); +static_assert(!__is_void(unsigned)); +static_assert(!__is_void(bool)); +static_assert(!__is_void(char)); +static_assert(!__is_void(float)); +static_assert(!__is_void(double)); +static_assert(!__is_void(int *)); +static_assert(!__is_void(int &)); +static_assert(!__is_void(int &&)); +static_assert(!__is_void(int[2])); +static_assert(!__is_void(int[])); +static_assert(__is_void(void)); +static_assert(!__is_void(decltype(nullptr))); +static_assert(!__is_void(int S::*)); +static_assert(!__is_void(void(S::*)())); +static_assert(!__is_void(Fn)); +static_assert(!__is_void(void (*)())); +static_assert(!__is_void(E)); +static_assert(!__is_void(EC)); +static_assert(!__is_void(S)); +static_assert(!__is_void(Empty)); +static_assert(!__is_void(Final)); +static_assert(!__is_void(Poly)); +static_assert(!__is_void(Virt)); +static_assert(!__is_void(Dtor)); +static_assert(!__is_void(NoDtor)); +static_assert(!__is_void(Agg)); +static_assert(!__is_void(U)); +static_assert(!__is_void(NonTriv)); +static_assert(!__is_void(Padded)); +static_assert(!__is_void(Ref)); +static_assert(!__is_volatile(int)); +static_assert(!__is_volatile(const int)); +static_assert(__is_volatile(volatile int)); +static_assert(!__is_volatile(unsigned)); +static_assert(!__is_volatile(bool)); +static_assert(!__is_volatile(char)); +static_assert(!__is_volatile(float)); +static_assert(!__is_volatile(double)); +static_assert(!__is_volatile(int *)); +static_assert(!__is_volatile(int &)); +static_assert(!__is_volatile(int &&)); +static_assert(!__is_volatile(int[2])); +static_assert(!__is_volatile(int[])); +static_assert(!__is_volatile(void)); +static_assert(!__is_volatile(decltype(nullptr))); +static_assert(!__is_volatile(int S::*)); +static_assert(!__is_volatile(void(S::*)())); +static_assert(!__is_volatile(Fn)); +static_assert(!__is_volatile(void (*)())); +static_assert(!__is_volatile(E)); +static_assert(!__is_volatile(EC)); +static_assert(!__is_volatile(S)); +static_assert(!__is_volatile(Empty)); +static_assert(!__is_volatile(Final)); +static_assert(!__is_volatile(Poly)); +static_assert(!__is_volatile(Virt)); +static_assert(!__is_volatile(Dtor)); +static_assert(!__is_volatile(NoDtor)); +static_assert(!__is_volatile(Agg)); +static_assert(!__is_volatile(U)); +static_assert(!__is_volatile(NonTriv)); +static_assert(!__is_volatile(Padded)); +static_assert(!__is_volatile(Ref)); +static_assert(__has_trivial_constructor(UserCopy)); +static_assert(__has_trivial_constructor(UserAssign)); +static_assert(__has_trivial_constructor(Defaulted)); +static_assert(!__has_trivial_constructor(HasNT)); +static_assert(!__has_trivial_constructor(DerivNT)); +static_assert(!__has_trivial_constructor(DefInit)); +static_assert(__has_trivial_constructor(PrivDtor)); +static_assert(!__has_trivial_constructor(CExpr)); +static_assert(!__has_trivial_constructor(NonCExpr)); +static_assert(__has_trivial_constructor(Base)); +static_assert(__has_trivial_constructor(Deriv)); +static_assert(__has_trivial_constructor(Bits)); +static_assert(__has_trivial_constructor(UPad)); +static_assert(__has_trivial_constructor(Arr2)); +static_assert(__has_trivial_constructor(EmptyD)); +static_assert(__has_trivial_constructor(ConstMem)); +static_assert(!__has_trivial_copy(UserCopy)); +static_assert(__has_trivial_copy(UserAssign)); +static_assert(__has_trivial_copy(Defaulted)); +static_assert(!__has_trivial_copy(HasNT)); +static_assert(!__has_trivial_copy(DerivNT)); +static_assert(__has_trivial_copy(DefInit)); +static_assert(__has_trivial_copy(PrivDtor)); +static_assert(!__has_trivial_copy(CExpr)); +static_assert(__has_trivial_copy(NonCExpr)); +static_assert(__has_trivial_copy(Base)); +static_assert(__has_trivial_copy(Deriv)); +static_assert(__has_trivial_copy(Bits)); +static_assert(__has_trivial_copy(UPad)); +static_assert(__has_trivial_copy(Arr2)); +static_assert(__has_trivial_copy(EmptyD)); +static_assert(__has_trivial_copy(ConstMem)); +static_assert(__has_trivial_assign(UserCopy)); +static_assert(!__has_trivial_assign(UserAssign)); +static_assert(__has_trivial_assign(Defaulted)); +static_assert(!__has_trivial_assign(HasNT)); +static_assert(!__has_trivial_assign(DerivNT)); +static_assert(__has_trivial_assign(DefInit)); +static_assert(__has_trivial_assign(PrivDtor)); +static_assert(__has_trivial_assign(CExpr)); +static_assert(__has_trivial_assign(NonCExpr)); +static_assert(__has_trivial_assign(Base)); +static_assert(__has_trivial_assign(Deriv)); +static_assert(__has_trivial_assign(Bits)); +static_assert(__has_trivial_assign(UPad)); +static_assert(__has_trivial_assign(Arr2)); +static_assert(__has_trivial_assign(EmptyD)); +static_assert(__has_trivial_assign(ConstMem)); +static_assert(__has_nothrow_constructor(UserCopy)); +static_assert(__has_nothrow_constructor(UserAssign)); +static_assert(__has_nothrow_constructor(Defaulted)); +static_assert(!__has_nothrow_constructor(HasNT)); +static_assert(!__has_nothrow_constructor(DerivNT)); +static_assert(__has_nothrow_constructor(DefInit)); +static_assert(__has_nothrow_constructor(PrivDtor)); +static_assert(!__has_nothrow_constructor(CExpr)); +static_assert(!__has_nothrow_constructor(NonCExpr)); +static_assert(__has_nothrow_constructor(Base)); +static_assert(__has_nothrow_constructor(Deriv)); +static_assert(__has_nothrow_constructor(Bits)); +static_assert(__has_nothrow_constructor(UPad)); +static_assert(__has_nothrow_constructor(Arr2)); +static_assert(__has_nothrow_constructor(EmptyD)); +static_assert(__has_nothrow_constructor(ConstMem)); +static_assert(!__has_nothrow_copy(UserCopy)); +static_assert(__has_nothrow_copy(UserAssign)); +static_assert(__has_nothrow_copy(Defaulted)); +static_assert(!__has_nothrow_copy(HasNT)); +static_assert(!__has_nothrow_copy(DerivNT)); +static_assert(__has_nothrow_copy(DefInit)); +static_assert(__has_nothrow_copy(PrivDtor)); +static_assert(!__has_nothrow_copy(CExpr)); +static_assert(__has_nothrow_copy(NonCExpr)); +static_assert(__has_nothrow_copy(Base)); +static_assert(__has_nothrow_copy(Deriv)); +static_assert(__has_nothrow_copy(Bits)); +static_assert(__has_nothrow_copy(UPad)); +static_assert(__has_nothrow_copy(Arr2)); +static_assert(__has_nothrow_copy(EmptyD)); +static_assert(__has_nothrow_copy(ConstMem)); +static_assert(__has_nothrow_assign(UserCopy)); +static_assert(!__has_nothrow_assign(UserAssign)); +static_assert(__has_nothrow_assign(Defaulted)); +static_assert(!__has_nothrow_assign(HasNT)); +static_assert(!__has_nothrow_assign(DerivNT)); +static_assert(__has_nothrow_assign(DefInit)); +static_assert(__has_nothrow_assign(PrivDtor)); +static_assert(__has_nothrow_assign(CExpr)); +static_assert(__has_nothrow_assign(NonCExpr)); +static_assert(__has_nothrow_assign(Base)); +static_assert(__has_nothrow_assign(Deriv)); +static_assert(__has_nothrow_assign(Bits)); +static_assert(__has_nothrow_assign(UPad)); +static_assert(__has_nothrow_assign(Arr2)); +static_assert(__has_nothrow_assign(EmptyD)); +static_assert(__has_nothrow_assign(ConstMem)); +static_assert(__has_trivial_destructor(UserCopy)); +static_assert(__has_trivial_destructor(UserAssign)); +static_assert(__has_trivial_destructor(Defaulted)); +static_assert(!__has_trivial_destructor(HasNT)); +static_assert(!__has_trivial_destructor(DerivNT)); +static_assert(__has_trivial_destructor(DefInit)); +static_assert(!__has_trivial_destructor(PrivDtor)); +static_assert(__has_trivial_destructor(CExpr)); +static_assert(__has_trivial_destructor(NonCExpr)); +static_assert(__has_trivial_destructor(Base)); +static_assert(__has_trivial_destructor(Deriv)); +static_assert(__has_trivial_destructor(Bits)); +static_assert(__has_trivial_destructor(UPad)); +static_assert(__has_trivial_destructor(Arr2)); +static_assert(__has_trivial_destructor(EmptyD)); +static_assert(__has_trivial_destructor(ConstMem)); +static_assert(__is_trivially_destructible(UserCopy)); +static_assert(__is_trivially_destructible(UserAssign)); +static_assert(__is_trivially_destructible(Defaulted)); +static_assert(!__is_trivially_destructible(HasNT)); +static_assert(!__is_trivially_destructible(DerivNT)); +static_assert(__is_trivially_destructible(DefInit)); +static_assert(!__is_trivially_destructible(PrivDtor)); +static_assert(__is_trivially_destructible(CExpr)); +static_assert(__is_trivially_destructible(NonCExpr)); +static_assert(__is_trivially_destructible(Base)); +static_assert(__is_trivially_destructible(Deriv)); +static_assert(__is_trivially_destructible(Bits)); +static_assert(__is_trivially_destructible(UPad)); +static_assert(__is_trivially_destructible(Arr2)); +static_assert(__is_trivially_destructible(EmptyD)); +static_assert(__is_trivially_destructible(ConstMem)); +static_assert(__is_destructible(UserCopy)); +static_assert(__is_destructible(UserAssign)); +static_assert(__is_destructible(Defaulted)); +static_assert(__is_destructible(HasNT)); +static_assert(__is_destructible(DerivNT)); +static_assert(__is_destructible(DefInit)); +static_assert(!__is_destructible(PrivDtor)); +static_assert(__is_destructible(CExpr)); +static_assert(__is_destructible(NonCExpr)); +static_assert(__is_destructible(Base)); +static_assert(__is_destructible(Deriv)); +static_assert(__is_destructible(Bits)); +static_assert(__is_destructible(UPad)); +static_assert(__is_destructible(Arr2)); +static_assert(__is_destructible(EmptyD)); +static_assert(__is_destructible(ConstMem)); +static_assert(!__has_unique_object_representations(UserCopy)); +static_assert(!__has_unique_object_representations(UserAssign)); +static_assert(__has_unique_object_representations(Defaulted)); +static_assert(!__has_unique_object_representations(HasNT)); +static_assert(!__has_unique_object_representations(DerivNT)); +static_assert(__has_unique_object_representations(DefInit)); +static_assert(!__has_unique_object_representations(PrivDtor)); +static_assert(!__has_unique_object_representations(CExpr)); +static_assert(__has_unique_object_representations(NonCExpr)); +static_assert(__has_unique_object_representations(Base)); +static_assert(__has_unique_object_representations(Deriv)); +static_assert(!__has_unique_object_representations(Bits)); +static_assert(!__has_unique_object_representations(UPad)); +static_assert(__has_unique_object_representations(Arr2)); +static_assert(__has_unique_object_representations(EmptyD)); +static_assert(__has_unique_object_representations(ConstMem)); +static_assert(!__is_trivially_relocatable(UserCopy)); +static_assert(__is_trivially_relocatable(UserAssign)); +static_assert(__is_trivially_relocatable(Defaulted)); +static_assert(!__is_trivially_relocatable(HasNT)); +static_assert(!__is_trivially_relocatable(DerivNT)); +static_assert(__is_trivially_relocatable(DefInit)); +static_assert(!__is_trivially_relocatable(PrivDtor)); +static_assert(!__is_trivially_relocatable(CExpr)); +static_assert(__is_trivially_relocatable(NonCExpr)); +static_assert(__is_trivially_relocatable(Base)); +static_assert(__is_trivially_relocatable(Deriv)); +static_assert(__is_trivially_relocatable(Bits)); +static_assert(__is_trivially_relocatable(UPad)); +static_assert(__is_trivially_relocatable(Arr2)); +static_assert(__is_trivially_relocatable(EmptyD)); +static_assert(__is_trivially_relocatable(ConstMem)); +static_assert(__is_literal_type(UserCopy)); +static_assert(__is_literal_type(UserAssign)); +static_assert(__is_literal_type(Defaulted)); +static_assert(!__is_literal_type(HasNT)); +static_assert(!__is_literal_type(DerivNT)); +static_assert(__is_literal_type(DefInit)); +static_assert(!__is_literal_type(PrivDtor)); +static_assert(__is_literal_type(CExpr)); +static_assert(!__is_literal_type(NonCExpr)); +static_assert(__is_literal_type(Base)); +static_assert(__is_literal_type(Deriv)); +static_assert(__is_literal_type(Bits)); +static_assert(__is_literal_type(UPad)); +static_assert(__is_literal_type(Arr2)); +static_assert(__is_literal_type(EmptyD)); +static_assert(__is_literal_type(ConstMem)); +static_assert(!__is_trivially_copyable(UserCopy)); +static_assert(!__is_trivially_copyable(UserAssign)); +static_assert(__is_trivially_copyable(Defaulted)); +static_assert(!__is_trivially_copyable(HasNT)); +static_assert(!__is_trivially_copyable(DerivNT)); +static_assert(__is_trivially_copyable(DefInit)); +static_assert(!__is_trivially_copyable(PrivDtor)); +static_assert(!__is_trivially_copyable(CExpr)); +static_assert(__is_trivially_copyable(NonCExpr)); +static_assert(__is_trivially_copyable(Base)); +static_assert(__is_trivially_copyable(Deriv)); +static_assert(__is_trivially_copyable(Bits)); +static_assert(__is_trivially_copyable(UPad)); +static_assert(__is_trivially_copyable(Arr2)); +static_assert(__is_trivially_copyable(EmptyD)); +static_assert(__is_trivially_copyable(ConstMem)); +static_assert(!__is_trivial(UserCopy)); +static_assert(!__is_trivial(UserAssign)); +static_assert(__is_trivial(Defaulted)); +static_assert(!__is_trivial(HasNT)); +static_assert(!__is_trivial(DerivNT)); +static_assert(!__is_trivial(DefInit)); +static_assert(!__is_trivial(PrivDtor)); +static_assert(!__is_trivial(CExpr)); +static_assert(!__is_trivial(NonCExpr)); +static_assert(__is_trivial(Base)); +static_assert(__is_trivial(Deriv)); +static_assert(__is_trivial(Bits)); +static_assert(__is_trivial(UPad)); +static_assert(__is_trivial(Arr2)); +static_assert(__is_trivial(EmptyD)); +static_assert(__is_trivial(ConstMem)); +static_assert(!__is_pod(UserCopy)); +static_assert(!__is_pod(UserAssign)); +static_assert(__is_pod(Defaulted)); +static_assert(!__is_pod(HasNT)); +static_assert(!__is_pod(DerivNT)); +static_assert(!__is_pod(DefInit)); +static_assert(!__is_pod(PrivDtor)); +static_assert(!__is_pod(CExpr)); +static_assert(!__is_pod(NonCExpr)); +static_assert(__is_pod(Base)); +static_assert(!__is_pod(Deriv)); +static_assert(__is_pod(Bits)); +static_assert(__is_pod(UPad)); +static_assert(__is_pod(Arr2)); +static_assert(__is_pod(EmptyD)); +static_assert(__is_pod(ConstMem)); +static_assert(__is_standard_layout(UserCopy)); +static_assert(__is_standard_layout(UserAssign)); +static_assert(__is_standard_layout(Defaulted)); +static_assert(__is_standard_layout(HasNT)); +static_assert(__is_standard_layout(DerivNT)); +static_assert(__is_standard_layout(DefInit)); +static_assert(__is_standard_layout(PrivDtor)); +static_assert(__is_standard_layout(CExpr)); +static_assert(__is_standard_layout(NonCExpr)); +static_assert(__is_standard_layout(Base)); +static_assert(!__is_standard_layout(Deriv)); +static_assert(__is_standard_layout(Bits)); +static_assert(__is_standard_layout(UPad)); +static_assert(__is_standard_layout(Arr2)); +static_assert(__is_standard_layout(EmptyD)); +static_assert(__is_standard_layout(ConstMem)); +int main() +{ + __CPROVER_assert(false, "WRONG (must FAIL)"); + return 0; +} diff --git a/regression/cbmc-cpp/cpp20_builtin_unary_type_traits_vs_clang/test.desc b/regression/cbmc-cpp/cpp20_builtin_unary_type_traits_vs_clang/test.desc new file mode 100644 index 000000000000..b15e85e073f7 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_builtin_unary_type_traits_vs_clang/test.desc @@ -0,0 +1,16 @@ +KNOWNBUG +main.cpp +--cpp20 --stdlib libc++ +^\[main\.assertion\.1\] .* WRONG \(must FAIL\): FAILURE$ +^VERIFICATION FAILED$ +^EXIT=10$ +^SIGNAL=0$ +-- +^warning: ignoring +static assertion failed +-- +The expected values are clang 18's (several traits are clang-only, so gcc +does not compile this program; --stdlib libc++ selects the clang keywords). +N5008 [basic.fundamental], [basic.compound], [class.prop], [class.dtor], +[meta.unary.prop]; GCC manual "Type Traits" for __has_trivial_* and +__has_nothrow_*. diff --git a/regression/cbmc-cpp/cpp20_call_result_through_pack_in_static_member_template/main.cpp b/regression/cbmc-cpp/cpp20_call_result_through_pack_in_static_member_template/main.cpp new file mode 100644 index 000000000000..bef13678f616 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_call_result_through_pack_in_static_member_template/main.cpp @@ -0,0 +1,100 @@ +// N5008 [over.match.best.general]/2.1, [over.ics.rank]/2.1, +// [temp.deduct.partial]: in `_Fn()(declval<_Args>...)' with _Fn = _Transform, +// the constrained two-parameter operator() template is viable (viewable_range +// holds: the substitution in view's sentinel_t fails, [temp.constr.atomic]/3) +// and is better than the C-style variadic operator() brought in by the +// using-declaration (an ellipsis conversion sequence is the worst), also when +// _S_test's template arguments come from the pack of __invoke, called from +// _Binder::_S_call. Reduced with cvise (g++ 13 and clang++ 18 checking each +// candidate, the assertion as a static_assert) from +// cpp20_range_adaptor_closure_invoked_through_invoke_impl; declval<_Args>... +// passes the functions themselves, as cvise left it. +extern "C" void __CPROVER_assert(bool, const char *); +template +void __declval(int); +template +auto declval() -> decltype(__declval<_Tp>(0)); +template +struct __success_type +{ + using type = _Tp; +}; +template +__success_type...))> _S_test(int); +template +struct __invoke_result; +template +bool is_same_v; +namespace __detail +{ +template +concept __same_as = is_same_v<_Tp, _Up>; +} +template +concept same_as = __detail::__same_as<_Up, _Tp>; +template +void forward(); +int end; +template +concept range = requires { end; }; +template +using sentinel_t = decltype(end(declval<_Range>())); +template +concept view = same_as<_Tp, sentinel_t<_Tp>>; +template +concept viewable_range = !view<_Tp>; +template +struct _Partial; +template +struct is_partial_p +{ + static constexpr bool value = false; +}; +template +struct is_partial_p<_Partial> +{ + static constexpr bool value = true; +}; +template +void __invoke(_Callable, _Args...) +{ + __CPROVER_assert( + !is_partial_p( + 0))::type>::value, + "two-parameter operator() selected"); +} +template +struct _Binder +{ + template + static void _S_call(_Tp, _CallArgs... __call_args) + { + __invoke(_Fd(), __call_args..., 0); + } +}; +struct _RangeAdaptor +{ + template + auto operator()(...) + { + return _Partial{0, forward<_Args>...}; + } +}; +template +struct _Partial<_Adaptor, _Args...> +{ +}; +struct _Transform : _RangeAdaptor +{ + template + void operator()(_Range, _Fp); + using _RangeAdaptor::operator(); +} main_a; +void b() +{ +} +int main() +{ + _Binder<_Transform>::_S_call(b, main_a); + __CPROVER_assert(false, "WRONG (must FAIL)"); +} diff --git a/regression/cbmc-cpp/cpp20_call_result_through_pack_in_static_member_template/test.desc b/regression/cbmc-cpp/cpp20_call_result_through_pack_in_static_member_template/test.desc new file mode 100644 index 000000000000..b64ad8fa1155 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_call_result_through_pack_in_static_member_template/test.desc @@ -0,0 +1,21 @@ +KNOWNBUG +main.cpp +--cpp20 +^\[__invoke\.assertion\.1\] line \d+ two-parameter operator\(\) selected: SUCCESS$ +^\[main\.assertion\.1\] line \d+ WRONG \(must FAIL\): FAILURE$ +^\*\* 1 of \d+ failed +^VERIFICATION FAILED$ +^EXIT=10$ +^SIGNAL=0$ +-- +^warning: ignoring +-- +Inside __invoke<_Transform, void (*)(), int>, instantiated from +_Binder::_S_call, decltype(_S_test<_Callable, _Args...>(0)) was the type +of the variadic C-style operator() (_Partial): the pack expansion +`_Args...' kept one element. The caller's one-element pack +(`__call_args..., 0') was still in the template map, and the +single-element pack substitution of the body removed every ellipsis, not +just those of patterns naming the substituted pack. Now the two-parameter +template is selected. N5008 [temp.variadic]/8-9. Reduced from +cpp20_range_adaptor_closure_invoked_through_invoke_impl. diff --git a/regression/cbmc-cpp/cpp20_char8_t_distinct_type/main.cpp b/regression/cbmc-cpp/cpp20_char8_t_distinct_type/main.cpp new file mode 100644 index 000000000000..de8dde38b206 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_char8_t_distinct_type/main.cpp @@ -0,0 +1,41 @@ +// N5008 [basic.fundamental]/9, [lex.ccon]/2, [lex.string]/1: char8_t is a +// distinct type whose underlying type is unsigned char; u8 literals have +// type char8_t and array of const char8_t +extern "C" void __CPROVER_assert(bool, const char *); +template +struct kind +{ + static const int value = 0; +}; +template <> +struct kind +{ + static const int value = 1; +}; +int f(const char8_t *) +{ + return 1; +} +int f(const char *) +{ + return 2; +} +int g(char8_t) +{ + return 1; +} +int g(unsigned char) +{ + return 2; +} +int main() +{ + __CPROVER_assert( + kind::value == 0 && kind::value == 1, + "specialization"); + __CPROVER_assert(!__is_same(char8_t, unsigned char), "__is_same"); + __CPROVER_assert(f(u8"a") == 1 && f("a") == 2, "u8 string literal"); + __CPROVER_assert(g(u8'a') == 1, "u8 character literal"); + __CPROVER_assert(sizeof(char8_t) == 1 && char8_t(-1) == 255, "underlying"); + __CPROVER_assert(kind::value == 0, "WRONG (must FAIL)"); +} diff --git a/regression/cbmc-cpp/cpp20_char8_t_distinct_type/test.desc b/regression/cbmc-cpp/cpp20_char8_t_distinct_type/test.desc new file mode 100644 index 000000000000..169f1429c09d --- /dev/null +++ b/regression/cbmc-cpp/cpp20_char8_t_distinct_type/test.desc @@ -0,0 +1,26 @@ +KNOWNBUG +main.cpp +--cpp20 +^\[main\.assertion\.1\] line \d+ specialization: SUCCESS$ +^\[main\.assertion\.2\] line \d+ __is_same: SUCCESS$ +^\[main\.assertion\.3\] line \d+ u8 string literal: SUCCESS$ +^\[main\.assertion\.4\] line \d+ u8 character literal: SUCCESS$ +^\[main\.assertion\.5\] line \d+ underlying: SUCCESS$ +^\[main\.assertion\.6\] line \d+ WRONG \(must FAIL\): FAILURE$ +^VERIFICATION FAILED$ +^EXIT=10$ +^SIGNAL=0$ +-- +^warning: ignoring +^CONVERSION ERROR$ +-- +N5008 [basic.fundamental]/9: char8_t is a distinct type with underlying +type unsigned char; [lex.ccon]/2, [lex.string]/1: u8'a' has type char8_t +and u8"a" type const char8_t[2]. The parser turned char8_t into +unsigned char, and c_preprocess.cpp undefined __cpp_char8_t so that the +library would not declare duplicate specializations; kind +selected kind (bin53). char8_t is now its own bit-vector type +(#c_type char8_t, cpp11_specialization_distinguishes_fundamental_types), +u8 literals have it in C++20, and __cpp_char8_t is defined as the +compiler defines it. g++ 13 and clang++ 18 accept this program, and it +fails only its WRONG assertion. diff --git a/regression/cbmc-cpp/cpp20_char8t/main.cpp b/regression/cbmc-cpp/cpp20_char8t/main.cpp new file mode 100644 index 000000000000..987d0c71abd3 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_char8t/main.cpp @@ -0,0 +1,7 @@ +// C++20 char8_t +int main() +{ + char8_t c = u8'A'; + __CPROVER_assert(c == 65, "char8_t"); + return 0; +} diff --git a/regression/cbmc-cpp/cpp20_char8t/test.desc b/regression/cbmc-cpp/cpp20_char8t/test.desc new file mode 100644 index 000000000000..b0d3720397eb --- /dev/null +++ b/regression/cbmc-cpp/cpp20_char8t/test.desc @@ -0,0 +1,10 @@ +KNOWNBUG +main.cpp +--cpp20 +^VERIFICATION SUCCESSFUL$ +^EXIT=0$ +^SIGNAL=0$ +-- +dropped the body +-- +C++20 char8_t type diff --git a/regression/cbmc-cpp/cpp20_class_nttp_brace/main.cpp b/regression/cbmc-cpp/cpp20_class_nttp_brace/main.cpp new file mode 100644 index 000000000000..d5f7ad5a4b14 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_class_nttp_brace/main.cpp @@ -0,0 +1,18 @@ +// C++20: class type NTTP with brace initialization +struct Fixed +{ + int value; + constexpr Fixed(int v) : value(v) + { + } +}; +template +int get() +{ + return F.value; +} +int main() +{ + int r = get(); + __CPROVER_assert(r == 42, "class NTTP brace"); +} diff --git a/regression/cbmc-cpp/cpp20_class_nttp_brace/test.desc b/regression/cbmc-cpp/cpp20_class_nttp_brace/test.desc new file mode 100644 index 000000000000..e2c448e59c26 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_class_nttp_brace/test.desc @@ -0,0 +1,16 @@ +KNOWNBUG +main.cpp +--cpp20 +^VERIFICATION SUCCESSFUL$ +^EXIT=0$ +^SIGNAL=0$ +-- +dropped the body +-- +Was KNOWNBUG since round 152 ("expected constant expression, but got +'<>'"). Fixed 2026-09-24: the constant evaluator folds a +constexpr constructor call on a temporary into a struct constant +([expr.const]/22, [class.base.init]), the template argument list and the +instance's template map carry that constant ([temp.arg.nontype]/1, +[temp.param]/12), and the instance identifier renders it flat +([temp.type]/1). diff --git a/regression/cbmc-cpp/cpp20_class_nttp_constexpr_ctor/main.cpp b/regression/cbmc-cpp/cpp20_class_nttp_constexpr_ctor/main.cpp new file mode 100644 index 000000000000..241509d813b0 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_class_nttp_constexpr_ctor/main.cpp @@ -0,0 +1,57 @@ +// N5008 [temp.param]/12, [temp.arg.nontype]/1, [expr.const]/22: class-type +// non-type template arguments from constexpr constructors. +extern "C" void __CPROVER_assert(bool, const char *); + +struct Fixed +{ + int value; + int twice; + constexpr Fixed(int v) : value(v), twice(2 * v) + { + } +}; + +struct Ordered +{ + int lo; + int hi; + constexpr Ordered(int x, int y) : lo(x), hi(y) + { + if(lo > hi) + { + int t = lo; + lo = hi; + hi = t; + } + } +}; + +template +constexpr int sum() +{ + return F.value + F.twice; +} + +template +struct S +{ + static constexpr int v = F.value; +}; + +template +constexpr int low() +{ + return o.lo; +} + +int main() +{ + __CPROVER_assert(sum() == 126, "parenthesised"); + __CPROVER_assert(sum() == 21, "braced"); + __CPROVER_assert(S::v == 3, "class template"); + __CPROVER_assert(low() == 2, "constructor body ran"); + static_assert(low() == 4, "constant expression"); + static_assert(sum() == 3, "constant expression 2"); + __CPROVER_assert(sum() == 4, "WRONG (must FAIL)"); + return 0; +} diff --git a/regression/cbmc-cpp/cpp20_class_nttp_constexpr_ctor/test.desc b/regression/cbmc-cpp/cpp20_class_nttp_constexpr_ctor/test.desc new file mode 100644 index 000000000000..be750af78ba1 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_class_nttp_constexpr_ctor/test.desc @@ -0,0 +1,19 @@ +KNOWNBUG +main.cpp +--cpp20 +^\[main\.assertion\.5\] line \d+ WRONG \(must FAIL\): FAILURE$ +^VERIFICATION FAILED$ +^EXIT=10$ +^SIGNAL=0$ +-- +^warning: ignoring +^CONVERSION ERROR$ +static_assert condition could not be evaluated +dropped the body +-- +N5008 [temp.param]/12 + [temp.arg.nontype]/1: class-type non-type template +arguments built by constexpr constructors -- with several members, a +constructor body (a conditional swap), the same argument spelled twice +naming one specialization, distinct arguments naming distinct ones, use in +a class template and in a constant expression (static_assert folds). +Non-vacuous: the last assertion states a wrong value and must FAIL. diff --git a/regression/cbmc-cpp/cpp20_class_template_redeclared_with_qualified_concept_name/main.cpp b/regression/cbmc-cpp/cpp20_class_template_redeclared_with_qualified_concept_name/main.cpp new file mode 100644 index 000000000000..e13cc1187d1a --- /dev/null +++ b/regression/cbmc-cpp/cpp20_class_template_redeclared_with_qualified_concept_name/main.cpp @@ -0,0 +1,38 @@ +// N5008 [temp.over.link]/5-6, [temp.constr.decl]: two declarations of a +// class template whose constrained parameters name the same concept are +// declarations of the same template, however the concept is qualified +// (`template struct fptr;' then `template struct fptr +// {...}' -- libstdc++ 16's declares __formatter_ptr with `__char' +// and defines it with `__format::__char'). The front end compared the +// spelling and rejected the definition ("template declaration of +// '__formatter_ptr' does not match previous declaration"), so every +// std::format call failed to type-check with gcc 16 (Docker matrix: +// tumbleweed, archlinux). +extern "C" void __CPROVER_assert(bool, const char *); +namespace fmt +{ +template +concept same_as = __is_same(T, U); +template +concept chr = same_as || same_as; +template +struct fptr; // declared with the concept named unqualified +} // namespace fmt +namespace fmt +{ +template +struct fptr // defined with the same concept, qualified +{ + int width = sizeof(C) * 8; +}; +} // namespace fmt +int main() +{ + fmt::fptr p; + fmt::fptr q; + __CPROVER_assert( + p.width == 8 && q.width == sizeof(wchar_t) * 8, + "redeclaration with equivalently spelled constraint"); + __CPROVER_assert(false, "WRONG (must FAIL)"); + return 0; +} diff --git a/regression/cbmc-cpp/cpp20_class_template_redeclared_with_qualified_concept_name/test.desc b/regression/cbmc-cpp/cpp20_class_template_redeclared_with_qualified_concept_name/test.desc new file mode 100644 index 000000000000..f785a8065760 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_class_template_redeclared_with_qualified_concept_name/test.desc @@ -0,0 +1,14 @@ +KNOWNBUG +main.cpp +--cpp20 +^\[main\.assertion\.1\] .* redeclaration with equivalently spelled constraint: SUCCESS$ +^\[main\.assertion\.2\] .* WRONG \(must FAIL\): FAILURE$ +^VERIFICATION FAILED$ +^EXIT=10$ +^SIGNAL=0$ +-- +^warning: ignoring +^CONVERSION ERROR$ +-- +g++ 13 (-fsanitize=address,undefined) and clang++ 18 accept this program, +and it fails only its WRONG assertion. diff --git a/regression/cbmc-cpp/cpp20_common_reference_int_lvalue_rvalue/main.cpp b/regression/cbmc-cpp/cpp20_common_reference_int_lvalue_rvalue/main.cpp new file mode 100644 index 000000000000..e63338526d01 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_common_reference_int_lvalue_rvalue/main.cpp @@ -0,0 +1,31 @@ +// N5008 [meta.trans.other] common_reference over differing reference kinds. +#include + +struct W +{ + int v = 0; +}; + +int main() +{ + static_assert( + std::is_same_v, const int &>, + "int&, int&&"); + static_assert( + std::is_same_v, const int &>, + "int&&, const int&"); + static_assert( + std::is_same_v, int &&>, + "int&&, int&&"); + static_assert( + std::is_same_v, const W &>, "W&, W&&"); + static_assert( + std::is_same_v, const W &>, + "W&&, const W&"); + static_assert( + std::is_same_v, long>, + "different types: common_type"); + static_assert(std::common_reference_with, "with int&, int&&"); + static_assert(std::common_reference_with, "with W&&, W&"); + return 0; +} diff --git a/regression/cbmc-cpp/cpp20_common_reference_int_lvalue_rvalue/test.desc b/regression/cbmc-cpp/cpp20_common_reference_int_lvalue_rvalue/test.desc new file mode 100644 index 000000000000..59ad460b11a6 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_common_reference_int_lvalue_rvalue/test.desc @@ -0,0 +1,24 @@ +KNOWNBUG +main.cpp +--cpp20 +^VERIFICATION SUCCESSFUL$ +^EXIT=0$ +^SIGNAL=0$ +-- +^warning: ignoring +^CONVERSION ERROR$ +dropped the body +-- +N5008 [meta.trans.other] COMMON-REF: common_reference_t is +const int& (COMMON-REF(A&&, B&) = D = COMMON-REF(const A&, B&) when A&& is +convertible to D), common_reference_t likewise, and +common_reference_with holds -- the conjunct of +indirectly_readable that blocked every user-defined iterator. Exercises the +libstdc++ machinery end to end: __match_cv_qualifiers' private member +typedef used as a nested-name-specifier, __common_ref_impl's constrained +rvalue partial specializations (_Require>), and an +inherited `value' looked up right after the class is completed. +With the libstdc++ 16 headers common_reference_t failed +(tagged broken-libstdcxx16); the root cause, +cpp20_constrained_partial_specialization_reached_through_base_chain, is +fixed, and the test passes with GCC 16.2.1. diff --git a/regression/cbmc-cpp/cpp20_common_reference_with_cv_differing_references/main.cpp b/regression/cbmc-cpp/cpp20_common_reference_with_cv_differing_references/main.cpp new file mode 100644 index 000000000000..e2a718f356c6 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_common_reference_with_cv_differing_references/main.cpp @@ -0,0 +1,23 @@ +// N5008 [concept.commonref], [meta.trans.other]/3.5, [meta.trans.other]/6.3.1: +// common_reference_t is `const W &' (COMMON-REF of two lvalue +// references: an lvalue reference to the cv-union of the referenced types), so +// common_reference_with holds. The front end evaluates the +// concept false: libstdc++'s __common_ref chain (`decltype(false ? declval< +// __copy_cv<_Xp, _Yp> &>() : declval<__copy_cv<_Yp, _Xp> &>())') is not +// reduced. Note the same_as / const-const cases hold. +#include +struct W +{ + int v = 0; +}; +int main() +{ + static_assert(std::common_reference_with, "same type"); + static_assert( + std::common_reference_with, + "cv-differing lvalue references"); + static_assert( + std::same_as, const W &>, + "common_reference_t is const W &"); + return 0; +} diff --git a/regression/cbmc-cpp/cpp20_common_reference_with_cv_differing_references/test.desc b/regression/cbmc-cpp/cpp20_common_reference_with_cv_differing_references/test.desc new file mode 100644 index 000000000000..c651a248c48e --- /dev/null +++ b/regression/cbmc-cpp/cpp20_common_reference_with_cv_differing_references/test.desc @@ -0,0 +1,16 @@ +KNOWNBUG +main.cpp +--cpp20 +^EXIT=0$ +^SIGNAL=0$ +^VERIFICATION SUCCESSFUL$ +-- +^warning: ignoring +^CONVERSION ERROR$ +dropped the body +-- +Was KNOWNBUG (2026-09-22, found while reducing the gcc 16 failure of +cpp20_concept_conjunction_requires_params): "static assertion failed: +cv-differing lvalue references". Fixed 2026-09-23: the conditional operator +over two lvalues differing in cv now yields an lvalue of the cv-combined type +([expr.cond]/4.1), which COND-RES / __common_ref rest on. diff --git a/regression/cbmc-cpp/cpp20_compare_header/main.cpp b/regression/cbmc-cpp/cpp20_compare_header/main.cpp new file mode 100644 index 000000000000..a432c9a521f5 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_compare_header/main.cpp @@ -0,0 +1,14 @@ +#if !defined(_MSC_VER) && __has_include() +# include +int main() +{ + std::strong_ordering so = std::strong_ordering::less; + __CPROVER_assert(so < 0, "less < 0"); + __CPROVER_assert(!(so == 0), "less != 0"); +} + +#else +int main() +{ +} +#endif diff --git a/regression/cbmc-cpp/cpp20_compare_header/test.desc b/regression/cbmc-cpp/cpp20_compare_header/test.desc new file mode 100644 index 000000000000..6e44901f450a --- /dev/null +++ b/regression/cbmc-cpp/cpp20_compare_header/test.desc @@ -0,0 +1,10 @@ +KNOWNBUG +main.cpp +--cpp20 +^VERIFICATION SUCCESSFUL$ +^EXIT=0$ +^SIGNAL=0$ +-- +dropped the body +-- +C++20 header with strong_ordering diff --git a/regression/cbmc-cpp/cpp20_compare_three_way_pointers_libcxx/main.cpp b/regression/cbmc-cpp/cpp20_compare_three_way_pointers_libcxx/main.cpp new file mode 100644 index 000000000000..3acd453ba966 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_compare_three_way_pointers_libcxx/main.cpp @@ -0,0 +1,23 @@ +#include +#include +extern "C" void __CPROVER_assert(bool, const char *); +class category +{ +public: + bool operator==(const category &rhs) const noexcept + { + return this == &rhs; + } + std::strong_ordering operator<=>(const category &rhs) const noexcept + { + return std::compare_three_way()(this, std::addressof(rhs)); + } +}; +int main() +{ + category a, b; + __CPROVER_assert(a == a && !(a == b), "identity comparison"); + __CPROVER_assert((a <=> a) == 0, "compare_three_way on pointers: equal"); + __CPROVER_assert((a <=> b) != 0, "compare_three_way on pointers: distinct"); + __CPROVER_assert((a <=> a) != 0, "WRONG (must FAIL)"); +} diff --git a/regression/cbmc-cpp/cpp20_compare_three_way_pointers_libcxx/test.desc b/regression/cbmc-cpp/cpp20_compare_three_way_pointers_libcxx/test.desc new file mode 100644 index 000000000000..b458b9609c1c --- /dev/null +++ b/regression/cbmc-cpp/cpp20_compare_three_way_pointers_libcxx/test.desc @@ -0,0 +1,38 @@ +KNOWNBUG libcxx +main.cpp +--cpp20 --stdlib libc++ --object-bits 12 +^\[main\.assertion\.1\] line \d+ identity comparison: SUCCESS$ +^\[main\.assertion\.2\] line \d+ compare_three_way on pointers: equal: SUCCESS$ +^\[main\.assertion\.3\] line \d+ compare_three_way on pointers: distinct: SUCCESS$ +^\[main\.assertion\.4\] line \d+ WRONG \(must FAIL\): FAILURE$ +^VERIFICATION FAILED$ +^EXIT=10$ +^SIGNAL=0$ +-- +^warning: ignoring +^CONVERSION ERROR$ +dropped the body +found no match for symbol +-- +N5008 [comparisons.three.way]: `std::compare_three_way()(p, q)' on two +pointers to the same class is the built-in `p <=> q' (strong_ordering); +libc++ 18 constrains the call operator with `three_way_comparable_with<_Tp, +_Up>' and defines it in <__compare/compare_three_way.h>. With libc++ the +call fails ("found no match for symbol 'operator()'" at line 28) and the +translation unit is rejected; this is libc++'s error_category::operator<=> +(`compare_three_way()(this, std::addressof(__rhs))'), dropped in every +libc++ C++20 test (audit residue item 2, round 162). With libstdc++ the +same program passes (--object-bits 12 is for the locale machinery pulled +in by ). +Round 163b (cvise reduction, /tmp/r163/red): libc++'s +`__get_comp_type<_Ts...>()' (common_comparison_category_t behind +three_way_comparable_with) exercised six front-end gaps, each fixed with a +header-free test: an empty pack expansion in a braced list +(cpp14_empty_pack_expansion_in_braced_list); a function template pack +followed by a defaulted parameter +(cpp14_function_template_pack_before_default_parameter); a constexpr local +array in constant expressions (cpp14_constexpr_local_array_in_constant_ +expression); `if constexpr' over such an array element +(cpp17_if_constexpr_constexpr_array_element); `void()' +(cpp14_void_functional_cast); and the built-in pointer `<=>' result +(cpp20_spaceship_builtin_pointers_prvalue). The test is CORE. diff --git a/regression/cbmc-cpp/cpp20_compound_requirement_concept/main.cpp b/regression/cbmc-cpp/cpp20_compound_requirement_concept/main.cpp new file mode 100644 index 000000000000..7f961ce361a7 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_compound_requirement_concept/main.cpp @@ -0,0 +1,41 @@ +// N5008 [expr.prim.req.compound]/1 + [temp.constr.op]: a +// compound-requirement's return-type-requirement `{ E } -> C` +// checks C; C's body here is a CONJUNCTION of +// type predicates (`__is_same(_Tp,_Up) && __is_same(_Up,_Tp)`, the +// libc++ same_as shape). template_mapt::apply(exprt) recursed into +// unnamed children AS TYPES, so a predicate nested under `&&` kept +// its parameter names unbound, the concept body failed to typecheck, +// and every such requirement evaluated FALSE (assertion 1 failed; +// the negative cases masked the defect by failing "correctly"). +extern "C" void __CPROVER_assert(bool, const char *); +template +concept same_as_ = __is_same(_Tp, _Up) && __is_same(_Up, _Tp); + +template +concept has_self_add = requires(_Tp __t) { + { __t + __t } -> same_as_<_Tp>; +}; + +struct vec2 +{ + int x; + vec2 operator+(vec2 o) const + { + return {x + o.x}; + } +}; +struct weird +{ + int operator+(weird) const + { + return 0; + } +}; + +int main() +{ + __CPROVER_assert(has_self_add, "vec2 + vec2 -> vec2"); + __CPROVER_assert(!has_self_add, "weird + weird -> int, not weird"); + __CPROVER_assert(!has_self_add, "no + on void*"); + return 0; +} diff --git a/regression/cbmc-cpp/cpp20_compound_requirement_concept/test.desc b/regression/cbmc-cpp/cpp20_compound_requirement_concept/test.desc new file mode 100644 index 000000000000..f321a323c03f --- /dev/null +++ b/regression/cbmc-cpp/cpp20_compound_requirement_concept/test.desc @@ -0,0 +1,16 @@ +KNOWNBUG +main.cpp +--cpp20 +^\[main\.assertion\.1\] line \d+ vec2 \+ vec2 -> vec2: SUCCESS$ +^\[main\.assertion\.2\] line \d+ weird \+ weird -> int, not weird: SUCCESS$ +^\[main\.assertion\.3\] line \d+ no \+ on void\*: SUCCESS$ +^VERIFICATION SUCCESSFUL$ +^EXIT=0$ +^SIGNAL=0$ +-- +dropped the body +-- +Distilled from the std::__to_address(reverse_iterator) cascade (the +cpp20 vector-family blocker); _HasArrow detection over +reverse_iterator's constrained operator-> needs concept +return-type-requirements to evaluate correctly. diff --git a/regression/cbmc-cpp/cpp20_compound_requirement_return_type/main.cpp b/regression/cbmc-cpp/cpp20_compound_requirement_return_type/main.cpp new file mode 100644 index 000000000000..020dd638beeb --- /dev/null +++ b/regression/cbmc-cpp/cpp20_compound_requirement_return_type/main.cpp @@ -0,0 +1,51 @@ +// N5008 [expr.prim.req.compound]/1: a compound-requirement +// `{ E } -> C;` is satisfied when E is a valid expression AND +// C is satisfied. CBMC gets the FALSE case right (a type +// without the operator does not satisfy the requirement) but evaluates +// the SATISFIED cases as false too -- the return-type-requirement never +// holds. libc++'s incrementable_traits uses exactly this shape +// concept __has_integral_minus = +// requires(const _Tp& __x, const _Tp& __y) { { __x - __y } -> integral; }; +// to detect difference_type, so difference_type/iterator_traits come out +// wrong for every iterator and the C++20 ranges chain misbehaves -- +// the suspected remaining blocker of cpp20_ranges_basic_libcxx. +// g++ and clang++ both accept and run clean. +extern "C" void __CPROVER_assert(bool, const char *); +template +struct is_int_ +{ + static const bool value = false; +}; +template <> +struct is_int_ +{ + static const bool value = true; +}; +template +concept integral_ = is_int_::value; +template +concept has_integral_minus = requires(const T &a, const T &b) { + { a - b } -> integral_; +}; +struct no_minus +{ + int x; +}; +struct with_minus +{ + int x; + int operator-(const with_minus &o) const + { + return x - o.x; + } +}; +int main() +{ + bool a = has_integral_minus; + bool b = has_integral_minus; + bool c = has_integral_minus; + __CPROVER_assert(!a, "absent operator- => false"); + __CPROVER_assert(b, "present operator- => true"); + __CPROVER_assert(c, "int => true"); + return 0; +} diff --git a/regression/cbmc-cpp/cpp20_compound_requirement_return_type/test.desc b/regression/cbmc-cpp/cpp20_compound_requirement_return_type/test.desc new file mode 100644 index 000000000000..8f5e8fec50a6 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_compound_requirement_return_type/test.desc @@ -0,0 +1,62 @@ +KNOWNBUG +main.cpp +--cpp20 +^\[main\.assertion\.1\] line \d+ absent operator- => false: SUCCESS$ +^\[main\.assertion\.2\] line \d+ present operator- => true: SUCCESS$ +^\[main\.assertion\.3\] line \d+ int => true: SUCCESS$ +^VERIFICATION SUCCESSFUL$ +^EXIT=0$ +^SIGNAL=0$ +-- +dropped the body +-- +Currently: assertions 2 and 3 FAIL -- the return-type-requirement of a +compound requirement is never satisfied. +Round-90 diagnosis (TWO stacked defects, both located): +1. [temp.constr.atomic]/3: the concept's normalised body must be + CONTEXTUALLY CONVERTED to bool. A concept over a trait member + (`static const bool value`) folds to a c_bool constant, which + exprt::is_true() does not recognise, so every SATISFIED + return-type-requirement read as unsatisfied. Converting the + constant (as cpp_typecheck_resolve.cpp's tri-state evaluator already + does for requires-clauses) fixes assertion 3. +2. With that applied, assertion 2 (class with a MEMBER operator-) still + fails. ROUND-90 ROOT (sharper than "specialization selection"): the + STORED concept body's template argument is an `ambiguous` node with an + EMPTY type -- the reference to the concept's own parameter is not + recoverable from the body at all, so neither template_mapt::apply nor + a by-name walk can substitute it (an added walk over `template_args` + arguments changes nothing: there is no name to match). The dumped + pre-typecheck body is BYTE-IDENTICAL for the satisfied and the + unsatisfied case; the verdict therefore comes from ambient + template_map/scope state when `is_int_<...>` is resolved, which is why + the same body yields different answers for different Es (plain `int` + -> primary/false, `const int` -> specialization/true, both wrong for + the wrong reason). The fix must make the concept's parameter + RECOVERABLE in the stored body (or evaluate the concept through the + normal instantiation path with explicit arguments) rather than patch + the substitution. + Verified separately: `is_int_`, `is_int_` and + `is_int_` all resolve CORRECTLY outside a + requires-expression, so ordinary specialization matching is fine. +ROUND-99 ATTEMPT (reverted, recorded): evaluate the return-type +requirement as the CONCEPT-ID `C` -- the form a user +writes, which goes through the normal concept instantiation path instead +of the manual substitution that cannot work (the stored body's argument +is an `ambiguous` node with an empty type). That makes ALL THREE +assertions of this test pass, but regresses the negative case of CORE +cpp20_compound_requirement_concept (`{ __t + __t } -> same_as_<_Tp>` +must be FALSE for a type whose operator+ returns int): the EXPLICIT +type-constraint argument `_Tp` arrives as an `ambiguous` node wrapping an +unresolved cpp_name, and type-checking that type in the requirement's +context does NOT yield the enclosing parameter's binding, so the +concept-id evaluates satisfied. Resolving that explicit argument +correctly is the remaining obstacle -- fix it first, then this route +should close both layers at once. + +DO NOT land fix 1 alone: it makes previously-(wrongly)-unsatisfied +requirements satisfied and regressed 18 cbmc-cpp tests +(cpp20_vector_*, cpp20_span*, cpp20_ranges_basic, cpp20_erase_if*, +iterator_traits/concept chains) -- the surrounding C++20 library +machinery currently depends on the wrong answer. Both layers must land +together, ideally with fix 2 first. diff --git a/regression/cbmc-cpp/cpp20_compound_requirement_xvalue/main.cpp b/regression/cbmc-cpp/cpp20_compound_requirement_xvalue/main.cpp new file mode 100644 index 000000000000..08490f22df22 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_compound_requirement_xvalue/main.cpp @@ -0,0 +1,94 @@ +// N5008 [expr.prim.req.compound]/1: `{ E } -> C' is satisfied iff +// C is; [dcl.type.decltype]/1.4-1.6: for an xvalue E that is +// T&&, for an lvalue T&, for a prvalue T. The compound requirement took the +// type of the (implicitly dereferenced) operand and added `&' for an lvalue +// only, so a call returning an rvalue reference read as a prvalue: libc++'s +// `{ ranges::iter_move(__i) } -> same_as>' +// (int&&) failed and no pointer was indirectly_readable, hence no +// input_iterator, hence no contiguous_range and no std::span from a range. +extern "C" void __CPROVER_assert(bool, const char *); + +template +concept same_as = __is_same(T, U); + +int g; +int &lval() +{ + return g; +} +int &&xval() +{ + return static_cast(g); +} +int prval() +{ + return g; +} +struct S +{ + int m; + int &&mv() + { + return static_cast(m); + } +}; + +template +concept LRef = requires(F f) { + { f() } -> same_as; +}; +template +concept RRef = requires(F f) { + { f() } -> same_as; +}; +template +concept PR = requires(F f) { + { f() } -> same_as; +}; +template +concept DerefLRef = requires(P p) { + { *p } -> same_as; +}; +template +concept MoveDeref = requires(P p) { + { static_cast(*p) } -> same_as; +}; +template +concept MemberMove = requires(T t) { + { t.mv() } -> same_as; +}; +template +concept MemberRead = requires(T t) { + { t.m } -> same_as; +}; + +static_assert(LRef, "lvalue-returning call: int&"); +static_assert(!RRef, "lvalue-returning call is not int&&"); +static_assert(RRef < int && (*)() >, "xvalue call: int&&"); +static_assert(!LRef < int && (*)() >, "xvalue call is not int&"); +static_assert(!PR < int && (*)() >, "xvalue call is not a prvalue"); +static_assert(PR, "prvalue call: int"); +static_assert(DerefLRef, "*p is an lvalue: int&"); +static_assert(MoveDeref, "static_cast(*p): int&&"); +static_assert(MemberMove, "member call returning int&&"); +static_assert(MemberRead, "member read: int&"); + +template + requires RRef +int pick(F) +{ + return 2; +} +template + requires LRef +int pick(F) +{ + return 1; +} + +int main() +{ + __CPROVER_assert( + pick(&lval) == 1 && pick(&xval) == 2, "overloads by value category"); + __CPROVER_assert(pick(&xval) == 1, "WRONG (must FAIL)"); +} diff --git a/regression/cbmc-cpp/cpp20_compound_requirement_xvalue/test.desc b/regression/cbmc-cpp/cpp20_compound_requirement_xvalue/test.desc new file mode 100644 index 000000000000..88ceb340effd --- /dev/null +++ b/regression/cbmc-cpp/cpp20_compound_requirement_xvalue/test.desc @@ -0,0 +1,19 @@ +KNOWNBUG +main.cpp +--cpp20 +^EXIT=10$ +^SIGNAL=0$ +^\[main\.assertion\.1\] line \d+ overloads by value category: SUCCESS$ +^\[main\.assertion\.2\] line \d+ WRONG \(must FAIL\): FAILURE$ +^VERIFICATION FAILED$ +-- +static assertion failed +static_assert condition could not be evaluated +^warning: ignoring +^CONVERSION ERROR$ +dropped the body +-- +N5008 [expr.prim.req.compound]/1 + [dcl.type.decltype]/1.4-1.6: the type +tested by a return-type-requirement is decltype((E)). Non-vacuous: the last +assertion is deliberately wrong and must FAIL. Before the fix: "static +assertion failed: xvalue call: int&&" and the overload test FAILURE. diff --git a/regression/cbmc-cpp/cpp20_concept_as_bool/main.cpp b/regression/cbmc-cpp/cpp20_concept_as_bool/main.cpp new file mode 100644 index 000000000000..96cf320e956c --- /dev/null +++ b/regression/cbmc-cpp/cpp20_concept_as_bool/main.cpp @@ -0,0 +1,27 @@ +// Concept used as boolean value in template argument +template +concept is_int = __is_same(T, int); + +template +struct If +{ + using type = F; +}; +template +struct If +{ + using type = T; +}; + +template +struct S +{ + using type = typename If, int, double>::type; +}; + +int main() +{ + __CPROVER_assert(__is_same(S::type, int), "int satisfies is_int"); + __CPROVER_assert( + __is_same(S::type, double), "double does not satisfy is_int"); +} diff --git a/regression/cbmc-cpp/cpp20_concept_as_bool/test.desc b/regression/cbmc-cpp/cpp20_concept_as_bool/test.desc new file mode 100644 index 000000000000..364d916d224e --- /dev/null +++ b/regression/cbmc-cpp/cpp20_concept_as_bool/test.desc @@ -0,0 +1,9 @@ +KNOWNBUG +main.cpp +--cpp20 +^VERIFICATION SUCCESSFUL$ +^EXIT=0$ +^SIGNAL=0$ +-- +dropped the body +-- diff --git a/regression/cbmc-cpp/cpp20_concept_compound_req_eval/main.cpp b/regression/cbmc-cpp/cpp20_concept_compound_req_eval/main.cpp new file mode 100644 index 000000000000..c82926ef80e8 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_concept_compound_req_eval/main.cpp @@ -0,0 +1,35 @@ +// Compound requirement: requires(T t) { { *t } -> same_as; } +#include +template +concept same_as_test = __is_same(T, U); + +template +concept deref_to_int = requires(T t) { + { *t } -> same_as_test; +}; + +struct A +{ + int &operator*(); +}; +struct B +{ + double &operator*(); +}; + +template +struct S +{ + static const int x = 0; +}; +template +struct S +{ + static const int x = 1; +}; + +int main() +{ + __CPROVER_assert(S::x == 1, "A derefs to int&"); + __CPROVER_assert(S::x == 0, "B derefs to double&"); +} diff --git a/regression/cbmc-cpp/cpp20_concept_compound_req_eval/test.desc b/regression/cbmc-cpp/cpp20_concept_compound_req_eval/test.desc new file mode 100644 index 000000000000..f574e1d9e14d --- /dev/null +++ b/regression/cbmc-cpp/cpp20_concept_compound_req_eval/test.desc @@ -0,0 +1,11 @@ +KNOWNBUG +main.cpp +--cpp20 +^VERIFICATION SUCCESSFUL$ +^EXIT=0$ +^SIGNAL=0$ +-- +dropped the body +-- +Compound requirements ({ expr } -> concept;) in requires-expressions +are not evaluated. The parser skips them and returns true. diff --git a/regression/cbmc-cpp/cpp20_concept_compound_requirement/main.cpp b/regression/cbmc-cpp/cpp20_concept_compound_requirement/main.cpp new file mode 100644 index 000000000000..eef040baff04 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_concept_compound_requirement/main.cpp @@ -0,0 +1,25 @@ +// C++20 compound-requirement with a return-type-requirement: +// { E } -> C is satisfied iff E is valid and C holds. +// Per [expr.prim.req.compound]/1 and [dcl.type.decltype]/1, decltype((++a)) is +// an lvalue-reference (pre-increment of an arithmetic lvalue is an lvalue, +// [expr.pre.incr]/1), so SameAs holds for T=int. + +template +concept SameAs = __is_same(A, B); + +template +concept PreIncReturnsRef = requires(T a) { + { ++a } -> SameAs; +}; + +template +concept PlusReturnsValue = requires(T a) { + { a + a } -> SameAs; +}; + +int main() +{ + static_assert(PreIncReturnsRef, "++int is int&"); + static_assert(PlusReturnsValue, "int+int is int"); + return 0; +} diff --git a/regression/cbmc-cpp/cpp20_concept_compound_requirement/test.desc b/regression/cbmc-cpp/cpp20_concept_compound_requirement/test.desc new file mode 100644 index 000000000000..a78506e68be6 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_concept_compound_requirement/test.desc @@ -0,0 +1,19 @@ +KNOWNBUG +main.cpp +--cpp20 +^VERIFICATION SUCCESSFUL$ +^EXIT=0$ +^SIGNAL=0$ +-- +^CONVERSION ERROR$ +dropped the body +-- +C++20 compound requirement `{ E } -> C' ([expr.prim.req.compound]/1): +the return-type-requirement is checked as C. Pre-increment +of an arithmetic lvalue yields an lvalue ([expr.pre.incr]/1), so +decltype((++a)) is an lvalue reference and SameAs +holds. The type-constraint's explicit argument `T &' (a compound type +naming the enclosing template parameter) is substituted and type-checked +before the concept-id is evaluated; it was passed unsubstituted and the +static assertion "++int is int&" failed. See +doc/architectural/cpp-requires-expression-support.md. diff --git a/regression/cbmc-cpp/cpp20_concept_conjunction_requires_params/main.cpp b/regression/cbmc-cpp/cpp20_concept_conjunction_requires_params/main.cpp new file mode 100644 index 000000000000..8c72c79ea92c --- /dev/null +++ b/regression/cbmc-cpp/cpp20_concept_conjunction_requires_params/main.cpp @@ -0,0 +1,47 @@ +// C++20: a requires-expression that is only a *conjunct* of a larger +// constraint-expression (not the whole concept body) must still have its +// requirement-parameter-list bound ([expr.prim.req.general]/4). This is the +// shape of std::assignable_from / std::movable / std::copyable, which combine a +// concept-id conjunct with a parametered requires-expression. Exercises the +// real library concepts over a regular copyable/movable class. + +#include + +struct W +{ + int v = 0; + W() = default; + W(const W &) = default; + W(W &&) = default; + W &operator=(const W &) = default; + W &operator=(W &&) = default; + ~W() = default; +}; + +// A hand-written mirror of the assignable_from shape: a concept-id conjunct +// followed by a parametered requires-expression. +template +concept my_assignable_from = std::common_reference_with< + const std::remove_reference_t<_Lhs> &, + const std::remove_reference_t<_Rhs> &> && + requires(_Lhs __lhs, _Rhs &&__rhs) { + { + __lhs = static_cast<_Rhs &&>(__rhs) + } -> std::same_as<_Lhs>; + }; + +int main() +{ + // Hand-written conjunction-with-parametered-requires. + static_assert(my_assignable_from, "W& = W&& yields W&"); + + // Real library concepts of the same shape. + static_assert(std::assignable_from, "assignable_from"); + static_assert(std::movable, "movable"); + static_assert(std::copyable, "copyable"); + + // Negative: int is not assignable through a const-ref lhs. + static_assert(!std::assignable_from, "const lhs"); + + return 0; +} diff --git a/regression/cbmc-cpp/cpp20_concept_conjunction_requires_params/test.desc b/regression/cbmc-cpp/cpp20_concept_conjunction_requires_params/test.desc new file mode 100644 index 000000000000..006311609cf9 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_concept_conjunction_requires_params/test.desc @@ -0,0 +1,19 @@ +KNOWNBUG +main.cpp +--cpp20 +^VERIFICATION SUCCESSFUL$ +^EXIT=0$ +^SIGNAL=0$ +-- +^CONVERSION ERROR$ +^.*error.*$ +dropped the body +-- +C++20 requires-expression parameter binding when the requires-expression is a +conjunct of a larger constraint-expression ([expr.prim.req.general]/4). A +concept of the shape ` && requires(params){...}` -- the shape of +std::assignable_from, std::movable and std::copyable -- must bind the +requires-expression's parameters even though its #requires_params node is not at +the top of the constraint-expression. Guards the recursive +requirement-parameter materialisation in instantiate_template. See +doc/architectural/cpp-requires-expression-support.md. diff --git a/regression/cbmc-cpp/cpp20_concept_constrained_auto/main.cpp b/regression/cbmc-cpp/cpp20_concept_constrained_auto/main.cpp new file mode 100644 index 000000000000..028dede375f2 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_concept_constrained_auto/main.cpp @@ -0,0 +1,15 @@ +// C++20 constrained auto parameter +#include + +template +concept Integral = std::is_integral_v; + +int f(Integral auto x) +{ + return x * 2; +} + +int main() +{ + __CPROVER_assert(f(21) == 42, "constrained auto"); +} diff --git a/regression/cbmc-cpp/cpp20_concept_constrained_auto/test.desc b/regression/cbmc-cpp/cpp20_concept_constrained_auto/test.desc new file mode 100644 index 000000000000..364d916d224e --- /dev/null +++ b/regression/cbmc-cpp/cpp20_concept_constrained_auto/test.desc @@ -0,0 +1,9 @@ +KNOWNBUG +main.cpp +--cpp20 +^VERIFICATION SUCCESSFUL$ +^EXIT=0$ +^SIGNAL=0$ +-- +dropped the body +-- diff --git a/regression/cbmc-cpp/cpp20_concept_constrained_auto/test_libcxx.desc b/regression/cbmc-cpp/cpp20_concept_constrained_auto/test_libcxx.desc new file mode 100644 index 000000000000..8e9636d4ddbd --- /dev/null +++ b/regression/cbmc-cpp/cpp20_concept_constrained_auto/test_libcxx.desc @@ -0,0 +1,9 @@ +KNOWNBUG libcxx +main.cpp +--cpp20 --stdlib libc++ +^VERIFICATION SUCCESSFUL$ +^EXIT=0$ +^SIGNAL=0$ +-- +^PARSING ERROR$ +^CONVERSION ERROR$ diff --git a/regression/cbmc-cpp/cpp20_concept_constrained_param/main.cpp b/regression/cbmc-cpp/cpp20_concept_constrained_param/main.cpp new file mode 100644 index 000000000000..97d9a0450ca0 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_concept_constrained_param/main.cpp @@ -0,0 +1,46 @@ +template +concept SameAs = __is_same(T, U); + +// Concept with template arguments as parameter constraint +template U> +T add(T a, U b) +{ + return a + b; +} + +// Qualified concept name +namespace detail +{ +template +concept Integral = __is_same(T, int); +} + +template +T identity(T x) +{ + return x; +} + +// Constructor with trailing requires clause +template +struct Wrapper +{ + T val; + Wrapper(T v) + requires SameAs + : val(v) + { + } +}; + +int main() +{ + int r1 = add(1, 2); + __CPROVER_assert(r1 == 3, "add works"); + + int r2 = identity(42); + __CPROVER_assert(r2 == 42, "identity works"); + + Wrapper w(10); + __CPROVER_assert(w.val == 10, "wrapper works"); +} diff --git a/regression/cbmc-cpp/cpp20_concept_constrained_param/test.desc b/regression/cbmc-cpp/cpp20_concept_constrained_param/test.desc new file mode 100644 index 000000000000..3f28b38105a0 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_concept_constrained_param/test.desc @@ -0,0 +1,9 @@ +KNOWNBUG +main.cpp +--cpp20 +^EXIT=0$ +^SIGNAL=0$ +^VERIFICATION SUCCESSFUL$ +-- +dropped the body +-- diff --git a/regression/cbmc-cpp/cpp20_concept_disjunction_first_operand_substitution_failure/main.cpp b/regression/cbmc-cpp/cpp20_concept_disjunction_first_operand_substitution_failure/main.cpp new file mode 100644 index 000000000000..748baa2e7c7f --- /dev/null +++ b/regression/cbmc-cpp/cpp20_concept_disjunction_first_operand_substitution_failure/main.cpp @@ -0,0 +1,28 @@ +extern "C" void __CPROVER_assert(bool, const char *); +struct Plain +{ + static constexpr bool simple = true; +}; +struct Templ +{ + // a variable template: `A::simple' without template arguments is not a + // valid expression for A = Templ + template + static constexpr bool simple = __is_same(T, int); +}; +// [temp.constr.op]/3: a disjunction is satisfied if either operand is; an +// operand whose substitution fails is not satisfied +// ([temp.constr.atomic]/3), so the second operand decides -- libstdc++ 16's +// views::__adaptor::__adaptor_has_simple_extra_args +template +concept has_simple = A::simple || A::template simple; +template +concept missing_or_true = A::nonexistent || true; +int main() +{ + __CPROVER_assert(has_simple, "first operand"); + __CPROVER_assert(has_simple, "second operand"); + __CPROVER_assert(!has_simple, "neither"); + __CPROVER_assert(missing_or_true, "failed first operand"); + __CPROVER_assert(!has_simple, "WRONG (must FAIL)"); +} diff --git a/regression/cbmc-cpp/cpp20_concept_disjunction_first_operand_substitution_failure/test.desc b/regression/cbmc-cpp/cpp20_concept_disjunction_first_operand_substitution_failure/test.desc new file mode 100644 index 000000000000..3e529fa6aff1 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_concept_disjunction_first_operand_substitution_failure/test.desc @@ -0,0 +1,33 @@ +KNOWNBUG +main.cpp +--cpp20 +^\[main\.assertion\.1\] line \d+ first operand: SUCCESS$ +^\[main\.assertion\.2\] line \d+ second operand: SUCCESS$ +^\[main\.assertion\.3\] line \d+ neither: SUCCESS$ +^\[main\.assertion\.4\] line \d+ failed first operand: SUCCESS$ +^\[main\.assertion\.5\] line \d+ WRONG \(must FAIL\): FAILURE$ +^VERIFICATION FAILED$ +^EXIT=10$ +^SIGNAL=0$ +-- +^warning: ignoring +^CONVERSION ERROR$ +-- +N5008 [temp.constr.op]/3: a disjunction is satisfied if either operand is; +[temp.constr.atomic]/3: an atomic constraint whose substitution fails is not +satisfied (not an error). The front end type-checked a concept's body as a +whole expression, so a substitution failure in the FIRST operand of `||' +made the whole concept-id false and the second operand was never considered +(bin53). The top-level `&&' and `||' are now evaluated operand by operand +([temp.constr.normal]/1; cpp_typecheckt::convert_concept_initializer). Root +cause of +cpp20_ranges_basic and cpp20_iterator_t_of_pointer_undeduced_declval failing +with the libstdc++ 16 headers: views::__adaptor::__adaptor_has_simple_extra_args +is `_Adaptor::_S_has_simple_extra_args || _Adaptor::template +_S_has_simple_extra_args<_Args...>', and views::_Take's member is a variable +template, so the first operand fails; _Partial<_Take, int> then used the +primary template (a C++23 explicit object parameter operator()) and +`arr | views::take(3)' was rejected; with GCC 16.2.1 cpp20_ranges_basic now +passes. Removing the first disjunct from the +preprocessed header makes cpp20_ranges_basic verify. g++ 13 and clang++ 18 +accept this program, and it fails only its WRONG assertion. diff --git a/regression/cbmc-cpp/cpp20_concept_expression/main.cpp b/regression/cbmc-cpp/cpp20_concept_expression/main.cpp new file mode 100644 index 000000000000..190f937f26f4 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_concept_expression/main.cpp @@ -0,0 +1,22 @@ +// C++20: concept used as boolean expression +template +concept Integral = __is_same(T, int) || __is_same(T, long); + +template +int check() +{ + if constexpr(Integral) + return 1; + else + return 0; +} + +int main() +{ + __CPROVER_assert(check() == 1, "int is integral"); + __CPROVER_assert(check() == 0, "double is not integral"); + + // Concept as direct bool value + bool b = Integral; + __CPROVER_assert(b, "concept as bool"); +} diff --git a/regression/cbmc-cpp/cpp20_concept_expression/test.desc b/regression/cbmc-cpp/cpp20_concept_expression/test.desc new file mode 100644 index 000000000000..5f28d7a47f72 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_concept_expression/test.desc @@ -0,0 +1,10 @@ +KNOWNBUG +main.cpp +--cpp20 +^VERIFICATION SUCCESSFUL$ +^EXIT=0$ +^SIGNAL=0$ +-- +dropped the body +-- +C++20 concept used as boolean expression and in if constexpr diff --git a/regression/cbmc-cpp/cpp20_concept_id_substitution_failure/main.cpp b/regression/cbmc-cpp/cpp20_concept_id_substitution_failure/main.cpp new file mode 100644 index 000000000000..9785ba011fc7 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_concept_id_substitution_failure/main.cpp @@ -0,0 +1,41 @@ +// N5008 [temp.names]/9 + [temp.constr.atomic]/3: a concept-id is a +// prvalue of type bool; if substituting its template arguments yields +// an invalid type or expression the constraint is NOT SATISFIED -- +// the concept-id evaluates to false, it is not an error. libc++'s +// common_reference_with<_Tp, _Up> evaluates +// same_as<_Tp, common_reference_t<_Tp, _Up>> for types with no +// common_reference<...>::type; CBMC hard-errored ("found no match for +// symbol 'same_as'"), killing the whole // +// conversion (cvise-reduced from the vector driver, archived as +// .kiro/reductions/vector_same_as_cvt2_50lines.cpp). +extern "C" void __CPROVER_assert(bool, const char *); +template +concept same_as = true; +template +struct common_reference; +template +using common_reference_t = common_reference<_Types...>::type; +template +concept common_reference_with = same_as<_Up, common_reference_t<_Up>>; +template +struct cond +{ + using type = _Else; +}; +template +struct cond +{ + using type = I; +}; +struct A +{ +}; +struct B +{ +}; +using r = cond, A, B>::type; +int main() +{ + __CPROVER_assert(sizeof(r) == sizeof(B), "unsatisfied concept picks else"); + return 0; +} diff --git a/regression/cbmc-cpp/cpp20_concept_id_substitution_failure/test.desc b/regression/cbmc-cpp/cpp20_concept_id_substitution_failure/test.desc new file mode 100644 index 000000000000..6eef4bc22fbf --- /dev/null +++ b/regression/cbmc-cpp/cpp20_concept_id_substitution_failure/test.desc @@ -0,0 +1,13 @@ +KNOWNBUG +main.cpp +--cpp20 +^\[main\.assertion\.1\] line \d+ unsatisfied concept picks else: SUCCESS$ +^VERIFICATION SUCCESSFUL$ +^EXIT=0$ +^SIGNAL=0$ +-- +dropped the body +-- +Fixed 2026-08-04 (round 11): typecheck_expr_cpp_name detects a +concept-id (parser marks concept declarators '#concept'), resolves it +under a SFINAE guard, and folds failure to false. diff --git a/regression/cbmc-cpp/cpp20_concept_iterator_chain/main.cpp b/regression/cbmc-cpp/cpp20_concept_iterator_chain/main.cpp new file mode 100644 index 000000000000..f86767a1bc60 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_concept_iterator_chain/main.cpp @@ -0,0 +1,118 @@ +// C++20 iterator concepts evaluated over a *class* iterator (not just a +// pointer). This exercises the deep concept chain +// (random_access_iterator -> ... -> totally_ordered, sized_sentinel_for, +// semiregular -> copyable -> movable -> swappable -> assignable_from -> ...) +// over a user-defined iterator type, which depends on requires-expression +// parameter binding for conjoined requires-expressions +// ([expr.prim.req.general]/4) being correct. + +#include +#include + +// A hand-written random-access iterator, class type (like __normal_iterator). +struct It +{ + using value_type = int; + using difference_type = long; + using iterator_category = std::random_access_iterator_tag; + + int *p = nullptr; + + It() = default; + It(const It &) = default; + It &operator=(const It &) = default; + + int &operator*() const + { + return *p; + } + It &operator++() + { + ++p; + return *this; + } + It operator++(int) + { + It t = *this; + ++p; + return t; + } + It &operator--() + { + --p; + return *this; + } + It operator--(int) + { + It t = *this; + --p; + return t; + } + It &operator+=(difference_type n) + { + p += n; + return *this; + } + It &operator-=(difference_type n) + { + p -= n; + return *this; + } + It operator+(difference_type n) const + { + It t = *this; + t += n; + return t; + } + It operator-(difference_type n) const + { + It t = *this; + t -= n; + return t; + } + difference_type operator-(const It &o) const + { + return p - o.p; + } + int &operator[](difference_type n) const + { + return p[n]; + } + friend It operator+(difference_type n, const It &i) + { + return i + n; + } + bool operator==(const It &o) const + { + return p == o.p; + } + auto operator<=>(const It &o) const + { + return p <=> o.p; + } +}; + +// A non-iterator: only dereferenceable, not incrementable. +struct NotIt +{ + int &operator*() const; +}; + +int main() +{ + // Positive: the full chain over the class iterator It. + static_assert(std::input_or_output_iterator, "It io"); + static_assert(std::input_iterator, "It input"); + static_assert(std::forward_iterator, "It forward"); + static_assert(std::bidirectional_iterator, "It bidirectional"); + static_assert(std::random_access_iterator, "It random_access"); + + // Sanity: matches the pointer result. + static_assert(std::random_access_iterator, "ptr random_access"); + static_assert(std::contiguous_iterator, "ptr contiguous"); + + // Negative: NotIt is not even an input_or_output_iterator. + static_assert(!std::input_or_output_iterator, "NotIt not an iterator"); + + return 0; +} diff --git a/regression/cbmc-cpp/cpp20_concept_iterator_chain/test.desc b/regression/cbmc-cpp/cpp20_concept_iterator_chain/test.desc new file mode 100644 index 000000000000..0565914bfd90 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_concept_iterator_chain/test.desc @@ -0,0 +1,33 @@ +KNOWNBUG +main.cpp +--cpp20 +^VERIFICATION SUCCESSFUL$ +^EXIT=0$ +^SIGNAL=0$ +-- +^CONVERSION ERROR$ +dropped the body +-- +C++20 iterator concepts evaluated over a user-defined *class* iterator: the deep +concept chain random_access_iterator -> bidirectional -> forward -> input -> +input_or_output_iterator, which descends through semiregular -> copyable -> +movable -> swappable -> assignable_from and totally_ordered / +sized_sentinel_for. Depends on requirement-parameter binding for conjoined +requires-expressions ([expr.prim.req.general]/4). Includes the negative case +(a non-incrementable type is not an iterator). See +doc/architectural/cpp-requires-expression-support.md. + +Was KNOWNBUG since round 152 (main() partially type-checked). Fixed +2026-09-23 in layers: requirement-parameter binding (a function template's +parameters leaked into namespace std as a secondary lookup scope); +common_reference over differing references (conditional operator +cv/value-category rules, a private member typedef as nested-name-specifier, +[temp.deduct.type]/5.1 non-deduced contexts during partial-specialization +matching, inherited-member lookup after on-demand completion); +same-pattern constrained partial specializations kept distinct +(__iter_concept_impl); is_base_of over indirect bases (the iterator tag +hierarchy); and cv-unqualified pointer-arithmetic prvalues +(`{ __j + __n } -> same_as<_Iter>`). The source's `p <=> o.p` had been +reformatted to `p <= > o.p` (clang-format in C++17 mode). +contiguous_iterator holds too once __is_base_of completes its Derived +operand (ITER_TRAITS(int*) selected the wrong __iter_traits_impl before). diff --git a/regression/cbmc-cpp/cpp20_concept_nested_req/main.cpp b/regression/cbmc-cpp/cpp20_concept_nested_req/main.cpp new file mode 100644 index 000000000000..d3aa684c975f --- /dev/null +++ b/regression/cbmc-cpp/cpp20_concept_nested_req/main.cpp @@ -0,0 +1,36 @@ +// Nested requirement: requires { requires has_ref; } +template +concept has_ref = requires { typename T::reference; }; + +template +concept has_all = requires { + typename T::value_type; + requires has_ref; +}; + +struct A +{ + using value_type = int; + using reference = int &; +}; +struct B +{ + using value_type = int; +}; + +template +struct S +{ + static const int x = 0; +}; +template +struct S +{ + static const int x = 1; +}; + +int main() +{ + __CPROVER_assert(S::x == 1, "A has all"); + __CPROVER_assert(S::x == 0, "B missing reference"); +} diff --git a/regression/cbmc-cpp/cpp20_concept_nested_req/test.desc b/regression/cbmc-cpp/cpp20_concept_nested_req/test.desc new file mode 100644 index 000000000000..364d916d224e --- /dev/null +++ b/regression/cbmc-cpp/cpp20_concept_nested_req/test.desc @@ -0,0 +1,9 @@ +KNOWNBUG +main.cpp +--cpp20 +^VERIFICATION SUCCESSFUL$ +^EXIT=0$ +^SIGNAL=0$ +-- +dropped the body +-- diff --git a/regression/cbmc-cpp/cpp20_concept_qualified_constraint/main.cpp b/regression/cbmc-cpp/cpp20_concept_qualified_constraint/main.cpp new file mode 100644 index 000000000000..508c4b15f447 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_concept_qualified_constraint/main.cpp @@ -0,0 +1,49 @@ +// C++20: a *qualified* concept name used as a type-constraint on a template +// parameter (N5008 [temp.param]/1, [temp.names]) must be recognised as a +// type-constraint, not mistaken for a non-type parameter because of the +// leading namespace. This is the shape libstdc++ uses for iter_reference_t: +// namespace std::__detail { template concept __dereferenceable; } +// template<__detail::__dereferenceable T> using iter_reference_t = ...; +// +// Previously CBMC parsed `__detail::__dereferenceable _Tp` as a non-type +// parameter of type `__detail::__dereferenceable`, so instantiating the alias +// with a type argument failed ("expected expression, but got type"); when the +// enclosing class was first instantiated in a declaration context (a function +// signature), the failure truncated the class to zero components and the +// truncated form was cached, so a later brace-construction fell back to +// aggregate initialisation and went out of bounds. + +namespace ns +{ +namespace __detail +{ +template +concept __dereferenceable = true; +} +// Alias template with a QUALIFIED concept name as its type-constraint. +template <__detail::__dereferenceable _Tp> +using ref_t = _Tp; + +template +struct container +{ + ref_t member; + container(char *, long) + { + } +}; + +// A declaration whose signature instantiates container *before* the +// construction below -- this is what made the truncation observable. +container make(); +} // namespace ns + +int main() +{ + char *p = nullptr; + long n = 2; + ns::container c{p, n}; + // If the class elaborated correctly it has its 'member' component. + __CPROVER_assert(sizeof(c.member) == sizeof(int), "member elaborated"); + return 0; +} diff --git a/regression/cbmc-cpp/cpp20_concept_qualified_constraint/test.desc b/regression/cbmc-cpp/cpp20_concept_qualified_constraint/test.desc new file mode 100644 index 000000000000..2230b92570cf --- /dev/null +++ b/regression/cbmc-cpp/cpp20_concept_qualified_constraint/test.desc @@ -0,0 +1,20 @@ +KNOWNBUG +main.cpp +--cpp20 +^VERIFICATION SUCCESSFUL$ +^EXIT=0$ +^SIGNAL=0$ +-- +^CONVERSION ERROR$ +^.*expected expression, but got type.*$ +^.*member designator index.*out of bounds.*$ +dropped the body +-- +C++20 qualified concept name as a template type-constraint +([temp.param]/1, [temp.names]). A constrained parameter +`template ` (the libstdc++ iter_reference_t shape, where the +concept lives in a nested namespace) must be parsed as a type-constraint, not as +a non-type parameter of a qualified type. Combined with a prior +declaration-context instantiation of the enclosing class, the mis-parse +truncated and cached the class, causing a downstream aggregate-init +out-of-bounds. See doc/architectural/cpp-requires-expression-support.md. diff --git a/regression/cbmc-cpp/cpp20_concept_requirement_soft_failure/main.cpp b/regression/cbmc-cpp/cpp20_concept_requirement_soft_failure/main.cpp new file mode 100644 index 000000000000..d041a811cd72 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_concept_requirement_soft_failure/main.cpp @@ -0,0 +1,37 @@ +// C++20 requires-expression soft-failure ([expr.prim.req.general]/5): a +// requirement whose expression is invalid in the immediate context makes the +// enclosing requires-expression evaluate to *false* -- it is not an ill-formed +// program. This must hold even when the invalid expression uses an overloaded +// operator on a class type, or a member access, whose resolution would +// otherwise emit a hard diagnostic. + +struct NoPlus +{ +}; + +struct HasFooMember +{ + void foo(); +}; + +// simple-requirement using a (missing) overloaded operator on a class type. +template +concept Addable = requires(T a) { a + a; }; + +// simple-requirement using a member call. +template +concept HasFoo = requires(T a) { a.foo(); }; + +int main() +{ + // operator+ exists for int but not for NoPlus -> soft false, not an error. + static_assert(Addable, "int is addable"); + static_assert(!Addable, "NoPlus has no operator+"); + + // member foo() exists for HasFooMember but not for int (a non-class type: + // member access would otherwise be a hard error) -> soft false. + static_assert(HasFoo, "HasFooMember has foo()"); + static_assert(!HasFoo, "int has no member foo()"); + + return 0; +} diff --git a/regression/cbmc-cpp/cpp20_concept_requirement_soft_failure/test.desc b/regression/cbmc-cpp/cpp20_concept_requirement_soft_failure/test.desc new file mode 100644 index 000000000000..f50a2812ed2e --- /dev/null +++ b/regression/cbmc-cpp/cpp20_concept_requirement_soft_failure/test.desc @@ -0,0 +1,19 @@ +KNOWNBUG +main.cpp +--cpp20 +^VERIFICATION SUCCESSFUL$ +^EXIT=0$ +^SIGNAL=0$ +-- +^CONVERSION ERROR$ +^.*error.*$ +dropped the body +-- +C++20 requires-expression soft-failure ([expr.prim.req.general]/5): a +requirement whose expression is invalid in the immediate context makes the +requires-expression evaluate to false rather than ill-forming the program, even +when the invalid expression uses an overloaded operator on a class type +(`a + a` with no operator+) or a member access on a non-class type +(`a.foo()`). Guards routing requirement nodes to SFINAE-guarded evaluation +before the ordinary operand recursion can emit a hard diagnostic. See +doc/architectural/cpp-requires-expression-support.md. diff --git a/regression/cbmc-cpp/cpp20_concept_requires_eval/main.cpp b/regression/cbmc-cpp/cpp20_concept_requires_eval/main.cpp new file mode 100644 index 000000000000..9cf45fa26618 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_concept_requires_eval/main.cpp @@ -0,0 +1,43 @@ +// C++20 concept evaluation: a concept whose constraint-expression is a +// requires-expression (simple requirement + type requirement) is evaluated as +// a constexpr bool, and a concept-id is usable as a value (here as a non-type +// bool template argument selecting a branch of a conditional). Grounded in +// N5008 [expr.prim.req.simple]/1, [expr.prim.req.type]/1, [temp.names]/9. + +template +struct cond +{ + using type = F; +}; +template +struct cond +{ + using type = T; +}; + +// simple-requirement: satisfied iff `a + a` is a valid expression. +template +concept Addable = requires(T a) { a + a; }; + +// type-requirement: satisfied iff T::value_type names a type. +template +concept HasValueType = requires { typename T::value_type; }; + +struct WithVT +{ + using value_type = int; +}; + +int main() +{ + // Addable is true; Addable is false (no operator+). + static_assert(Addable, "int is addable"); + static_assert(HasValueType, "WithVT has value_type"); + + // concept-id as a non-type bool template argument: picks branch T for true. + typename cond, int, char>::type picked_true = 0; + __CPROVER_assert( + sizeof(picked_true) == sizeof(int), "Addable selected int"); + + return 0; +} diff --git a/regression/cbmc-cpp/cpp20_concept_requires_eval/test.desc b/regression/cbmc-cpp/cpp20_concept_requires_eval/test.desc new file mode 100644 index 000000000000..6cbe8053ffc6 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_concept_requires_eval/test.desc @@ -0,0 +1,21 @@ +KNOWNBUG +main.cpp +--cpp20 +^VERIFICATION SUCCESSFUL$ +^EXIT=0$ +^SIGNAL=0$ +-- +^CONVERSION ERROR$ +dropped the body +-- +C++20 concept evaluation via requires-expressions ([expr.prim.req], +[temp.names]/9). A concept whose constraint-expression is a requires-expression +(simple-requirement and type-requirement) is evaluated to a constexpr bool, and +a concept-id is used as a non-type bool template argument. Guards the +front-end concept-evaluation support; see +doc/architectural/cpp-requires-expression-support.md. + +Not yet covered (tracked separately): compound-requirements with a +return-type-requirement ({E} -> C) -- blocked on value-category (lvalue) +tracking for decltype((E)); member-call requirements; uniform soft-failure for +requirement forms the parser routes outside the requirement-node handlers. diff --git a/regression/cbmc-cpp/cpp20_concept_shorthand/main.cpp b/regression/cbmc-cpp/cpp20_concept_shorthand/main.cpp new file mode 100644 index 000000000000..3246a29234fc --- /dev/null +++ b/regression/cbmc-cpp/cpp20_concept_shorthand/main.cpp @@ -0,0 +1,18 @@ +#if !defined(_MSC_VER) && __has_include() +// C++20 shorthand concept constraint: template +# include +template +T f(T x) +{ + return x; +} +int main() +{ + __CPROVER_assert(f(1) == 1, "ok"); +} + +#else +int main() +{ +} +#endif diff --git a/regression/cbmc-cpp/cpp20_concept_shorthand/test.desc b/regression/cbmc-cpp/cpp20_concept_shorthand/test.desc new file mode 100644 index 000000000000..364d916d224e --- /dev/null +++ b/regression/cbmc-cpp/cpp20_concept_shorthand/test.desc @@ -0,0 +1,9 @@ +KNOWNBUG +main.cpp +--cpp20 +^VERIFICATION SUCCESSFUL$ +^EXIT=0$ +^SIGNAL=0$ +-- +dropped the body +-- diff --git a/regression/cbmc-cpp/cpp20_concept_simple_req/main.cpp b/regression/cbmc-cpp/cpp20_concept_simple_req/main.cpp new file mode 100644 index 000000000000..8744aaa5207e --- /dev/null +++ b/regression/cbmc-cpp/cpp20_concept_simple_req/main.cpp @@ -0,0 +1,28 @@ +// Simple requirement: requires(T t) { ++t; } +template +concept incrementable = requires(T t) { ++t; }; + +struct A +{ + A &operator++(); +}; +struct B +{ +}; + +template +struct S +{ + static const int x = 0; +}; +template +struct S +{ + static const int x = 1; +}; + +int main() +{ + __CPROVER_assert(S::x == 1, "A is incrementable"); + __CPROVER_assert(S::x == 0, "B is not incrementable"); +} diff --git a/regression/cbmc-cpp/cpp20_concept_simple_req/test.desc b/regression/cbmc-cpp/cpp20_concept_simple_req/test.desc new file mode 100644 index 000000000000..38faccdd19d9 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_concept_simple_req/test.desc @@ -0,0 +1,11 @@ +KNOWNBUG +main.cpp +--cpp20 +^VERIFICATION SUCCESSFUL$ +^EXIT=0$ +^SIGNAL=0$ +-- +dropped the body +-- +Simple requirements in requires-expressions are not evaluated. +The parser skips them and returns true. diff --git a/regression/cbmc-cpp/cpp20_concept_subsumption/main.cpp b/regression/cbmc-cpp/cpp20_concept_subsumption/main.cpp new file mode 100644 index 000000000000..90c8b4a8494f --- /dev/null +++ b/regression/cbmc-cpp/cpp20_concept_subsumption/main.cpp @@ -0,0 +1,26 @@ +#include + +template +concept Integral = std::is_integral_v; + +template +concept SignedIntegral = Integral && std::is_signed_v; + +template +int f(T) +{ + return 1; +} + +template +int f(T) +{ + return 2; +} + +int main() +{ + // SignedIntegral subsumes Integral, so f(42) should pick the more + // constrained overload. + __CPROVER_assert(f(42) == 2, "signed integral preferred"); +} diff --git a/regression/cbmc-cpp/cpp20_concept_subsumption/test.desc b/regression/cbmc-cpp/cpp20_concept_subsumption/test.desc new file mode 100644 index 000000000000..364d916d224e --- /dev/null +++ b/regression/cbmc-cpp/cpp20_concept_subsumption/test.desc @@ -0,0 +1,9 @@ +KNOWNBUG +main.cpp +--cpp20 +^VERIFICATION SUCCESSFUL$ +^EXIT=0$ +^SIGNAL=0$ +-- +dropped the body +-- diff --git a/regression/cbmc-cpp/cpp20_concept_subsumption/test_libcxx.desc b/regression/cbmc-cpp/cpp20_concept_subsumption/test_libcxx.desc new file mode 100644 index 000000000000..8e9636d4ddbd --- /dev/null +++ b/regression/cbmc-cpp/cpp20_concept_subsumption/test_libcxx.desc @@ -0,0 +1,9 @@ +KNOWNBUG libcxx +main.cpp +--cpp20 --stdlib libc++ +^VERIFICATION SUCCESSFUL$ +^EXIT=0$ +^SIGNAL=0$ +-- +^PARSING ERROR$ +^CONVERSION ERROR$ diff --git a/regression/cbmc-cpp/cpp20_concept_type_req/main.cpp b/regression/cbmc-cpp/cpp20_concept_type_req/main.cpp new file mode 100644 index 000000000000..9a89797a5747 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_concept_type_req/main.cpp @@ -0,0 +1,28 @@ +// Type requirement: requires { typename T::value_type; } +template +concept has_value_type = requires { typename T::value_type; }; + +struct A +{ + using value_type = int; +}; +struct B +{ +}; + +template +struct S +{ + static const int x = 0; +}; +template +struct S +{ + static const int x = 1; +}; + +int main() +{ + __CPROVER_assert(S::x == 1, "A has value_type"); + __CPROVER_assert(S::x == 0, "B has no value_type"); +} diff --git a/regression/cbmc-cpp/cpp20_concept_type_req/test.desc b/regression/cbmc-cpp/cpp20_concept_type_req/test.desc new file mode 100644 index 000000000000..364d916d224e --- /dev/null +++ b/regression/cbmc-cpp/cpp20_concept_type_req/test.desc @@ -0,0 +1,9 @@ +KNOWNBUG +main.cpp +--cpp20 +^VERIFICATION SUCCESSFUL$ +^EXIT=0$ +^SIGNAL=0$ +-- +dropped the body +-- diff --git a/regression/cbmc-cpp/cpp20_concept_verify/main.cpp b/regression/cbmc-cpp/cpp20_concept_verify/main.cpp new file mode 100644 index 000000000000..b742912a8886 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_concept_verify/main.cpp @@ -0,0 +1,16 @@ +// C++20 concepts +template +concept Integral = sizeof(T) <= 8; + +template +T identity(T x) +{ + return x; +} + +int main() +{ + int r = identity(42); + __CPROVER_assert(r == 42, "concept constrained"); + return 0; +} diff --git a/regression/cbmc-cpp/cpp20_concept_verify/test.desc b/regression/cbmc-cpp/cpp20_concept_verify/test.desc new file mode 100644 index 000000000000..9403c971714e --- /dev/null +++ b/regression/cbmc-cpp/cpp20_concept_verify/test.desc @@ -0,0 +1,10 @@ +KNOWNBUG +main.cpp +--cpp20 +^VERIFICATION SUCCESSFUL$ +^EXIT=0$ +^SIGNAL=0$ +-- +dropped the body +-- +C++20 concepts with constrained template parameter diff --git a/regression/cbmc-cpp/cpp20_concepts/main.cpp b/regression/cbmc-cpp/cpp20_concepts/main.cpp new file mode 100644 index 000000000000..9b08603cf8ab --- /dev/null +++ b/regression/cbmc-cpp/cpp20_concepts/main.cpp @@ -0,0 +1,16 @@ +// C++20 concepts +template +concept Integral = __is_same(T, int) || __is_same(T, long); + +template +T add(T a, T b) +{ + return a + b; +} + +int main() +{ + int r = add(1, 2); + __CPROVER_assert(r == 3, "1+2==3"); + return 0; +} diff --git a/regression/cbmc-cpp/cpp20_concepts/test.desc b/regression/cbmc-cpp/cpp20_concepts/test.desc new file mode 100644 index 000000000000..ce5196f26778 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_concepts/test.desc @@ -0,0 +1,10 @@ +KNOWNBUG +main.cpp +--cpp20 +^VERIFICATION SUCCESSFUL$ +^EXIT=0$ +^SIGNAL=0$ +-- +dropped the body +-- +C++20 concepts are not yet supported by the C++ front-end. diff --git a/regression/cbmc-cpp/cpp20_concepts_basic/main.cpp b/regression/cbmc-cpp/cpp20_concepts_basic/main.cpp new file mode 100644 index 000000000000..e16657a98fc4 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_concepts_basic/main.cpp @@ -0,0 +1,35 @@ +// Basic requires clause on function template — already works (skipped) +template + requires(sizeof(T) > 1) +T double_val(T x) +{ + return x + x; +} + +// Trailing requires clause +template +T triple_val(T x) + requires(sizeof(T) > 1) +{ + return x + x + x; +} + +// requires clause on partial specialization +template +struct Traits +{ + static const int value = 0; +}; +template + requires(sizeof(T) >= 4) +struct Traits +{ + static const int value = 1; +}; + +int main() +{ + __CPROVER_assert(double_val(21) == 42, "double_val"); + __CPROVER_assert(triple_val(10) == 30, "triple_val"); + __CPROVER_assert(Traits::value == 1, "Traits"); +} diff --git a/regression/cbmc-cpp/cpp20_concepts_basic/test.desc b/regression/cbmc-cpp/cpp20_concepts_basic/test.desc new file mode 100644 index 000000000000..dc38674d0559 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_concepts_basic/test.desc @@ -0,0 +1,11 @@ +KNOWNBUG +main.cpp +--cpp20 +^EXIT=0$ +^SIGNAL=0$ +^VERIFICATION SUCCESSFUL$ +-- +dropped the body +-- +Basic requires clauses on functions and partial specializations. +CBMC skips requires clauses (treats as always satisfied). diff --git a/regression/cbmc-cpp/cpp20_concepts_compound_req/main.cpp b/regression/cbmc-cpp/cpp20_concepts_compound_req/main.cpp new file mode 100644 index 000000000000..28d32f4f926b --- /dev/null +++ b/regression/cbmc-cpp/cpp20_concepts_compound_req/main.cpp @@ -0,0 +1,44 @@ +// Phase 3.2: Compound requirements +// requires(T x) { { expr } -> concept; } +// Checks that expr is valid AND its type satisfies the concept. + +template +concept same_as = __is_same(T, U); + +template +concept HasIntSize = requires(T c) { + { c.size() } -> same_as; +}; + +// This should NOT satisfy HasIntSize (size() returns unsigned long) +struct WrongReturn +{ + unsigned long size() const + { + return 0; + } +}; + +// Without compound requirement evaluation, CBMC skips the +// return type check and accepts WrongReturn as HasIntSize. +template +int check(T) +{ + return 0; +} + +template +int check(T) +{ + return 1; +} + +int main() +{ + WrongReturn w; + // With proper compound requirement evaluation, check(w) should + // return 0 (WrongReturn doesn't satisfy HasIntSize because + // size() returns unsigned long, not int). + // Without it, CBMC skips the constraint and returns 1. + __CPROVER_assert(check(w) == 0, "WrongReturn fails HasIntSize"); +} diff --git a/regression/cbmc-cpp/cpp20_concepts_compound_req/test.desc b/regression/cbmc-cpp/cpp20_concepts_compound_req/test.desc new file mode 100644 index 000000000000..3f28b38105a0 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_concepts_compound_req/test.desc @@ -0,0 +1,9 @@ +KNOWNBUG +main.cpp +--cpp20 +^EXIT=0$ +^SIGNAL=0$ +^VERIFICATION SUCCESSFUL$ +-- +dropped the body +-- diff --git a/regression/cbmc-cpp/cpp20_concepts_constrained_param/main.cpp b/regression/cbmc-cpp/cpp20_concepts_constrained_param/main.cpp new file mode 100644 index 000000000000..1840bdfa0321 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_concepts_constrained_param/main.cpp @@ -0,0 +1,23 @@ +// Abbreviated function templates with concept-constrained auto + +template +concept Number = __is_integral(T) || __is_floating_point(T); + +// Abbreviated function template: Number auto +Number auto square(Number auto x) +{ + return x * x; +} + +// Constrained template parameter: template +template +T cube(T x) +{ + return x * x * x; +} + +int main() +{ + __CPROVER_assert(square(6) == 36, "square int"); + __CPROVER_assert(cube(3) == 27, "cube int"); +} diff --git a/regression/cbmc-cpp/cpp20_concepts_constrained_param/test.desc b/regression/cbmc-cpp/cpp20_concepts_constrained_param/test.desc new file mode 100644 index 000000000000..eb2bde5ec68e --- /dev/null +++ b/regression/cbmc-cpp/cpp20_concepts_constrained_param/test.desc @@ -0,0 +1,11 @@ +KNOWNBUG +main.cpp +--cpp20 +^EXIT=0$ +^SIGNAL=0$ +^VERIFICATION SUCCESSFUL$ +-- +dropped the body +-- +Abbreviated function templates with concept-constrained auto. +CBMC skips concept constraints (treats as always satisfied). diff --git a/regression/cbmc-cpp/cpp20_concepts_named/main.cpp b/regression/cbmc-cpp/cpp20_concepts_named/main.cpp new file mode 100644 index 000000000000..6d0394e11152 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_concepts_named/main.cpp @@ -0,0 +1,27 @@ +// Named concept declarations and usage + +template +concept Integral = __is_integral(T); + +template +concept SignedIntegral = Integral && __is_signed(T); + +template +T increment(T x) +{ + return x + 1; +} + +// Concept used in requires clause +template + requires SignedIntegral +T negate(T x) +{ + return -x; +} + +int main() +{ + __CPROVER_assert(increment(41) == 42, "increment"); + __CPROVER_assert(negate(42) == -42, "negate"); +} diff --git a/regression/cbmc-cpp/cpp20_concepts_named/test.desc b/regression/cbmc-cpp/cpp20_concepts_named/test.desc new file mode 100644 index 000000000000..eaf2a07073ad --- /dev/null +++ b/regression/cbmc-cpp/cpp20_concepts_named/test.desc @@ -0,0 +1,16 @@ +KNOWNBUG +main.cpp +--cpp20 +^EXIT=0$ +^SIGNAL=0$ +^VERIFICATION SUCCESSFUL$ +-- +dropped the body +-- +Named concept declarations (template concept X = ...). +CBMC skips concept constraints (treats as always satisfied). + +Was KNOWNBUG since round 152 ("function must have return type"): a +requires-clause followed directly by the declaration's type name +(`requires SignedIntegral T negate(T x)`) -- fixed 2026-09-23 in the +restricted constraint parser, see cpp20_requires_unparenthesized. diff --git a/regression/cbmc-cpp/cpp20_concepts_nested_req/main.cpp b/regression/cbmc-cpp/cpp20_concepts_nested_req/main.cpp new file mode 100644 index 000000000000..712805b28591 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_concepts_nested_req/main.cpp @@ -0,0 +1,25 @@ +// Phase 3.3: Nested requirements +// requires { requires expr; } — evaluates expr as a boolean constraint. + +template +concept SmallType = requires { requires sizeof(T) <= 4; }; + +template +int check(T) +{ + return 0; +} + +template +int check(T) +{ + return 1; +} + +int main() +{ + // double is 8 bytes, so it should NOT satisfy SmallType. + // Without nested requirement evaluation, CBMC skips the + // constraint and returns 1. + __CPROVER_assert(check(3.14) == 0, "double is not SmallType"); +} diff --git a/regression/cbmc-cpp/cpp20_concepts_nested_req/test.desc b/regression/cbmc-cpp/cpp20_concepts_nested_req/test.desc new file mode 100644 index 000000000000..3f28b38105a0 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_concepts_nested_req/test.desc @@ -0,0 +1,9 @@ +KNOWNBUG +main.cpp +--cpp20 +^EXIT=0$ +^SIGNAL=0$ +^VERIFICATION SUCCESSFUL$ +-- +dropped the body +-- diff --git a/regression/cbmc-cpp/cpp20_concepts_ordering/main.cpp b/regression/cbmc-cpp/cpp20_concepts_ordering/main.cpp new file mode 100644 index 000000000000..18aeb042aa44 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_concepts_ordering/main.cpp @@ -0,0 +1,32 @@ +// Constraint-based partial specialization ordering: +// when multiple constrained specializations match, the most +// constrained one should be selected. + +template +struct category +{ + static const int value = 0; +}; + +// Specialization for pointer types +template + requires(__is_pointer(T)) +struct category +{ + static const int value = 1; +}; + +// More constrained: pointer to integral +template + requires(__is_pointer(T) && __is_integral(__remove_pointer(T))) +struct category +{ + static const int value = 2; +}; + +int main() +{ + __CPROVER_assert(category::value == 0, "non-pointer"); + __CPROVER_assert(category::value == 1, "pointer to non-integral"); + __CPROVER_assert(category::value == 2, "pointer to integral"); +} diff --git a/regression/cbmc-cpp/cpp20_concepts_ordering/test.desc b/regression/cbmc-cpp/cpp20_concepts_ordering/test.desc new file mode 100644 index 000000000000..3f28b38105a0 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_concepts_ordering/test.desc @@ -0,0 +1,9 @@ +KNOWNBUG +main.cpp +--cpp20 +^EXIT=0$ +^SIGNAL=0$ +^VERIFICATION SUCCESSFUL$ +-- +dropped the body +-- diff --git a/regression/cbmc-cpp/cpp20_concepts_ordering_gcc14/main.cpp b/regression/cbmc-cpp/cpp20_concepts_ordering_gcc14/main.cpp new file mode 100644 index 000000000000..383700a974f7 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_concepts_ordering_gcc14/main.cpp @@ -0,0 +1,29 @@ +// Same as cpp20_concepts_ordering but for GCC 14.2+ where +// __is_pointer/__remove_pointer builtins interact differently +// with the system headers. +template +struct category +{ + static const int value = 0; +}; + +template + requires(__is_pointer(T)) +struct category +{ + static const int value = 1; +}; + +template + requires(__is_pointer(T) && __is_integral(__remove_pointer(T))) +struct category +{ + static const int value = 2; +}; + +int main() +{ + __CPROVER_assert(category::value == 0, "non-pointer"); + __CPROVER_assert(category::value == 1, "pointer to non-integral"); + __CPROVER_assert(category::value == 2, "pointer to integral"); +} diff --git a/regression/cbmc-cpp/cpp20_concepts_ordering_gcc14/test.desc b/regression/cbmc-cpp/cpp20_concepts_ordering_gcc14/test.desc new file mode 100644 index 000000000000..9e861bc0d493 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_concepts_ordering_gcc14/test.desc @@ -0,0 +1,16 @@ +KNOWNBUG clang20 +main.cpp +--cpp20 +^VERIFICATION SUCCESSFUL$ +^EXIT=0$ +^SIGNAL=0$ +-- +dropped the body +-- +Concept-constrained specialization ordering with __is_pointer and +__remove_pointer builtins in requires clauses produces incorrect +results when CBMC uses Clang 20 as the preprocessor. The requires +clause requires(__is_pointer(T)) incorrectly matches non-pointer +types. The same test passes with Clang 18. The preprocessed C++ +code is identical; the issue is in CBMC's internal state when +configured for Clang 20. diff --git a/regression/cbmc-cpp/cpp20_concepts_overload/main.cpp b/regression/cbmc-cpp/cpp20_concepts_overload/main.cpp new file mode 100644 index 000000000000..fc9037a72e90 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_concepts_overload/main.cpp @@ -0,0 +1,26 @@ +#if !defined(_MSC_VER) && __has_include() +// C++20 concept-constrained overload resolution +# include +template + requires std::integral +T add(T a, T b) +{ + return a + b; +} +template + requires std::floating_point +T add(T a, T b) +{ + return a + b; +} +int main() +{ + __CPROVER_assert(add(1, 2) == 3, "integral add"); + __CPROVER_assert(add(1.0, 2.0) == 3.0, "floating add"); +} + +#else +int main() +{ +} +#endif diff --git a/regression/cbmc-cpp/cpp20_concepts_overload/test.desc b/regression/cbmc-cpp/cpp20_concepts_overload/test.desc new file mode 100644 index 000000000000..dc1e1fa3e152 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_concepts_overload/test.desc @@ -0,0 +1,13 @@ +KNOWNBUG +main.cpp +--cpp20 +^VERIFICATION SUCCESSFUL$ +^EXIT=0$ +^SIGNAL=0$ +-- +dropped the body +-- +Was KNOWNBUG since round 152 ("function must have return type"): a +requires-clause followed directly by the declaration's type name +(`requires SignedIntegral T negate(T x)`) -- fixed 2026-09-23 in the +restricted constraint parser, see cpp20_requires_unparenthesized. diff --git a/regression/cbmc-cpp/cpp20_concepts_requires_expr/main.cpp b/regression/cbmc-cpp/cpp20_concepts_requires_expr/main.cpp new file mode 100644 index 000000000000..5e34d6a52de0 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_concepts_requires_expr/main.cpp @@ -0,0 +1,18 @@ +// requires-expression with expression requirements: +// requires(T x) { x + 1; } checks if x + 1 is a valid expression + +template + requires requires(T a, U b) { a + b; } +auto add(T a, U b) +{ + return a + b; +} + +// Compound requirement with return type constraint +// requires(T x) { { x.size() } -> same_as; } + +int main() +{ + __CPROVER_assert(add(1, 2) == 3, "add ints"); + __CPROVER_assert(add(1.5, 2.5) == 4.0, "add doubles"); +} diff --git a/regression/cbmc-cpp/cpp20_concepts_requires_expr/test.desc b/regression/cbmc-cpp/cpp20_concepts_requires_expr/test.desc new file mode 100644 index 000000000000..7e6ef789db0a --- /dev/null +++ b/regression/cbmc-cpp/cpp20_concepts_requires_expr/test.desc @@ -0,0 +1,17 @@ +KNOWNBUG +main.cpp +--cpp20 +^VERIFICATION SUCCESSFUL$ +^EXIT=0$ +^SIGNAL=0$ +-- +dropped the body +-- +N5008 [expr.prim.req.general]/4 + [temp.constr]. A requires-expression with a +requirement-parameter-list used directly as a function template's requires-clause +(`requires requires(T a, U b){ a + b; }`). Previously the requirement-parameters +(a, b) were not bound while the constraint was checked, so the requirement failed +to resolve and the candidate was dropped ("found no match"). Fixed by binding a +requires-expression's #requires_params as scope-local symbols before evaluating a +direct function-template requires-clause. Non-vacuous: both assertions exercise +the constrained overload. diff --git a/regression/cbmc-cpp/cpp20_concepts_requires_type/main.cpp b/regression/cbmc-cpp/cpp20_concepts_requires_type/main.cpp new file mode 100644 index 000000000000..f7221af4fff1 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_concepts_requires_type/main.cpp @@ -0,0 +1,47 @@ +// requires-expression with type requirements: +// requires { typename T::type; } checks if T has a member type 'type' + +// Primary template +template +struct get_inner +{ + typedef T type; +}; + +// Constrained specialization: only matches when T has value_type +template + requires requires { typename T::value_type; } +struct get_inner +{ + typedef typename T::value_type type; +}; + +struct Container +{ + typedef double value_type; +}; + +int main() +{ + // With full concept evaluation: + // get_inner::type should be int (primary, int has no value_type) + // get_inner::type should be double (specialization) + // + // Without concept evaluation, CBMC skips the requires clause and + // always tries the specialization. For int, this fails because + // int::value_type doesn't exist, causing a type-checking error + // that's suppressed. The primary template is then used, giving int. + // For Container, the specialization works, giving double. + // + // The test checks that both paths produce correct results. + // Currently get_inner falls back to primary (int) after the + // specialization fails, so both assertions should pass. + // But the error message "scope 'T' not found" indicates the + // requires clause is not being properly evaluated. + + get_inner::type x = 1.5; + __CPROVER_assert(x > 1.0, "Container inner type is double"); + + get_inner::type y = 42; + __CPROVER_assert(y == 42, "int inner type is int"); +} diff --git a/regression/cbmc-cpp/cpp20_concepts_requires_type/test.desc b/regression/cbmc-cpp/cpp20_concepts_requires_type/test.desc new file mode 100644 index 000000000000..85bc67dca1f2 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_concepts_requires_type/test.desc @@ -0,0 +1,18 @@ +KNOWNBUG +main.cpp +--cpp20 +^EXIT=0$ +^SIGNAL=0$ +^VERIFICATION SUCCESSFUL$ +-- +^CONVERSION ERROR$ +dropped the body +-- +requires-expression with a type requirement constraining a partial +specialization ([expr.prim.req.type]/1, [temp.constr]). + +Was KNOWNBUG since round 152 (no diagnostic before the drop): the type +requirement `typename T::value_type` THREW for T = int, the constraint +evaluation caught the exception and took the constraint as satisfied, so the +specialization was selected for int and its member typedef failed. Fixed +2026-09-23: an invalid type makes the requirement false. diff --git a/regression/cbmc-cpp/cpp20_concepts_subsumption/main.cpp b/regression/cbmc-cpp/cpp20_concepts_subsumption/main.cpp new file mode 100644 index 000000000000..075a6d0fd910 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_concepts_subsumption/main.cpp @@ -0,0 +1,33 @@ +// Phase 3.1: Constraint subsumption for function overload resolution +// Two function templates with different constraints on the same +// parameter. Without subsumption checking, this is ambiguous. + +template +concept Integral = __is_integral(T); + +template +concept SignedIntegral = Integral && __is_signed(T); + +// Overload 1: any integral +template + requires Integral +int classify(T) +{ + return 1; +} + +// Overload 2: signed integral (more constrained, subsumes Overload 1) +template + requires SignedIntegral +int classify(T) +{ + return 2; +} + +int main() +{ + // int is both Integral and SignedIntegral. + // With proper subsumption, overload 2 should be selected. + // Without it, CBMC may report ambiguity or pick the wrong one. + __CPROVER_assert(classify(42) == 2, "SignedIntegral subsumes Integral"); +} diff --git a/regression/cbmc-cpp/cpp20_concepts_subsumption/test.desc b/regression/cbmc-cpp/cpp20_concepts_subsumption/test.desc new file mode 100644 index 000000000000..3f28b38105a0 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_concepts_subsumption/test.desc @@ -0,0 +1,9 @@ +KNOWNBUG +main.cpp +--cpp20 +^EXIT=0$ +^SIGNAL=0$ +^VERIFICATION SUCCESSFUL$ +-- +dropped the body +-- diff --git a/regression/cbmc-cpp/cpp20_conditionally_explicit_constructor/main.cpp b/regression/cbmc-cpp/cpp20_conditionally_explicit_constructor/main.cpp new file mode 100644 index 000000000000..8e43b299a9af --- /dev/null +++ b/regression/cbmc-cpp/cpp20_conditionally_explicit_constructor/main.cpp @@ -0,0 +1,30 @@ +// N5008 [dcl.fct.spec]/4 (C++20): with explicit(constant-expression) the +// function is explicit iff the converted expression is true. W's +// constructor is a converting constructor, so `take(5)' copy-initializes +// the parameter; W's is explicit. The parser skipped the condition +// and made every such constructor explicit: "found no match for symbol +// 'take'" (the shape of std::pair's, std::tuple's and std::optional's +// conditionally explicit constructors). +extern "C" void __CPROVER_assert(bool, const char *); +template +struct W +{ + int v; + explicit(E) W(int x) : v(x) + { + } +}; +int take(W w) +{ + return w.v; +} +int main() +{ + W a(1); + __CPROVER_assert(take(5) == 5 && a.v == 1, "explicit(false) converts"); + __CPROVER_assert( + __is_convertible(int, W) && !__is_convertible(int, W), + "explicit(true) does not"); + __CPROVER_assert(false, "WRONG (must FAIL)"); + return 0; +} diff --git a/regression/cbmc-cpp/cpp20_conditionally_explicit_constructor/test.desc b/regression/cbmc-cpp/cpp20_conditionally_explicit_constructor/test.desc new file mode 100644 index 000000000000..26bc2904befa --- /dev/null +++ b/regression/cbmc-cpp/cpp20_conditionally_explicit_constructor/test.desc @@ -0,0 +1,15 @@ +KNOWNBUG +main.cpp +--cpp20 +^\[main\.assertion\.1\] .* explicit\(false\) converts: SUCCESS$ +^\[main\.assertion\.2\] .* explicit\(true\) does not: SUCCESS$ +^\[main\.assertion\.3\] .* WRONG \(must FAIL\): FAILURE$ +^VERIFICATION FAILED$ +^EXIT=10$ +^SIGNAL=0$ +-- +^warning: ignoring +^CONVERSION ERROR$ +-- +g++ 13 (-fsanitize=address,undefined) and clang++ 18 accept this program, +and it fails only its WRONG assertion. diff --git a/regression/cbmc-cpp/cpp20_constant_evaluation_of_class_prvalues/main.cpp b/regression/cbmc-cpp/cpp20_constant_evaluation_of_class_prvalues/main.cpp new file mode 100644 index 000000000000..4ba738fd1300 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_constant_evaluation_of_class_prvalues/main.cpp @@ -0,0 +1,78 @@ +// N5008 [expr.const]/22, /10: a call of a constexpr function returning a +// class, a temporary built by a constexpr constructor, and member reads and +// member calls on them are constant expressions; [stmt.switch]/2: so is a +// case label built from them (GCC 16's _Escapes<_CharT>::_S_tab()[0] in +// __should_escape_ascii) +extern "C" void __CPROVER_assert(bool, const char *); +struct P +{ + int a; + int b; + constexpr int sum() const + { + return a + b; + } +}; +constexpr P make() +{ + return P{1, 2}; +} +static_assert(make().a == 1, "member of a call result"); +static_assert(make().sum() == 3, "member call on a call result"); +template +struct sv +{ + const C *p; + unsigned long n; + constexpr sv(const C *s, unsigned long len) : p(s), n(len) + { + } + constexpr sv substr(unsigned long pos, unsigned long len) const + { + return sv(p + pos, len); + } + constexpr C operator[](unsigned long i) const + { + return p[i]; + } +}; +static_assert(sv("ab", 2).n == 2, "member of a temporary"); +static_assert(sv("ab" + 1, 1)[0] == 'b', "pointer into a literal"); +template +struct esc +{ + static consteval sv all() + { + return sv("\t\\t\n\\n", 6); + } + static consteval sv tab() + { + return all().substr(0, 3); + } + static consteval sv newline() + { + return all().substr(3, 3); + } +}; +static_assert(esc::newline()[0] == '\n', "consteval chain"); +template +constexpr bool should_escape(C c) +{ + using E = esc; + switch(c) + { + case E::tab()[0]: + case E::newline()[0]: + return true; + default: + return false; + } +} +int main() +{ + __CPROVER_assert( + should_escape('\t') && should_escape('\n'), "case labels evaluated"); + __CPROVER_assert(!should_escape('a'), "default label"); + __CPROVER_assert(should_escape('a'), "WRONG (must FAIL)"); + return 0; +} diff --git a/regression/cbmc-cpp/cpp20_constant_evaluation_of_class_prvalues/test.desc b/regression/cbmc-cpp/cpp20_constant_evaluation_of_class_prvalues/test.desc new file mode 100644 index 000000000000..30c2f7b1cafd --- /dev/null +++ b/regression/cbmc-cpp/cpp20_constant_evaluation_of_class_prvalues/test.desc @@ -0,0 +1,21 @@ +KNOWNBUG +main.cpp +--cpp20 +^\[main\.assertion\.1\] line \d+ case labels evaluated: SUCCESS$ +^\[main\.assertion\.2\] line \d+ default label: SUCCESS$ +^\[main\.assertion\.3\] line \d+ WRONG \(must FAIL\): FAILURE$ +^VERIFICATION FAILED$ +^EXIT=10$ +^SIGNAL=0$ +-- +^warning: ignoring +^CONVERSION ERROR$ +could not be evaluated +dropped the body +-- +The constant evaluator accepted only scalar results of non-constructor +calls, did not evaluate a temporary returned by a function (`return +sv(p + pos, len)'), and lost a pointer into a string literal whose index +was not a plain constant; a case label was not type-checked as a constant +expression. should_escape lost its body ("expected constant +expression"). diff --git a/regression/cbmc-cpp/cpp20_consteval/main.cpp b/regression/cbmc-cpp/cpp20_consteval/main.cpp new file mode 100644 index 000000000000..d3c03fac987e --- /dev/null +++ b/regression/cbmc-cpp/cpp20_consteval/main.cpp @@ -0,0 +1,10 @@ +consteval int square(int n) +{ + return n * n; +} + +int main() +{ + int x = square(5); + __CPROVER_assert(x == 25, "consteval square"); +} diff --git a/regression/cbmc-cpp/cpp20_consteval/test.desc b/regression/cbmc-cpp/cpp20_consteval/test.desc new file mode 100644 index 000000000000..ad14fcc1ba59 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_consteval/test.desc @@ -0,0 +1,10 @@ +KNOWNBUG +main.cpp +--cpp20 +^VERIFICATION SUCCESSFUL$ +^EXIT=0$ +^SIGNAL=0$ +-- +dropped the body +-- +C++20 consteval functions. diff --git a/regression/cbmc-cpp/cpp20_consteval_verify/main.cpp b/regression/cbmc-cpp/cpp20_consteval_verify/main.cpp new file mode 100644 index 000000000000..f2d38d041723 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_consteval_verify/main.cpp @@ -0,0 +1,11 @@ +// C++20 consteval (immediate function) +consteval int square(int x) +{ + return x * x; +} +int main() +{ + int r = square(5); + __CPROVER_assert(r == 25, "consteval"); + return 0; +} diff --git a/regression/cbmc-cpp/cpp20_consteval_verify/test.desc b/regression/cbmc-cpp/cpp20_consteval_verify/test.desc new file mode 100644 index 000000000000..c3cdcc64dd03 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_consteval_verify/test.desc @@ -0,0 +1,10 @@ +KNOWNBUG +main.cpp +--cpp20 +^VERIFICATION SUCCESSFUL$ +^EXIT=0$ +^SIGNAL=0$ +-- +dropped the body +-- +C++20 consteval immediate function diff --git a/regression/cbmc-cpp/cpp20_constexpr_call_statement_writing_through_reference/main.cpp b/regression/cbmc-cpp/cpp20_constexpr_call_statement_writing_through_reference/main.cpp new file mode 100644 index 000000000000..60eef70fb270 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_constexpr_call_statement_writing_through_reference/main.cpp @@ -0,0 +1,19 @@ +// N5008 [stmt.expr]/1, [dcl.constexpr]: a constexpr function's call statement +// may modify an object through a reference argument; f() is 2. +extern "C" void __CPROVER_assert(bool, const char *); +constexpr void touch(int &x) +{ + x = 2; +} +constexpr int f() +{ + int x = 1; + touch(x); + return x; +} +int main() +{ + constexpr int v = f(); + __CPROVER_assert(v == 2, "write through reference argument"); + __CPROVER_assert(v == 1, "WRONG (must FAIL)"); +} diff --git a/regression/cbmc-cpp/cpp20_constexpr_call_statement_writing_through_reference/test.desc b/regression/cbmc-cpp/cpp20_constexpr_call_statement_writing_through_reference/test.desc new file mode 100644 index 000000000000..e694a7238883 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_constexpr_call_statement_writing_through_reference/test.desc @@ -0,0 +1,14 @@ +KNOWNBUG +main.cpp +--cpp20 +^\[main\.assertion\.1\] line \d+ write through reference argument: SUCCESS$ +^\[main\.assertion\.2\] line \d+ WRONG \(must FAIL\): FAILURE$ +^\*\* 1 of \d+ failed +^VERIFICATION FAILED$ +^EXIT=10$ +^SIGNAL=0$ +-- +^warning: ignoring +-- +The constant evaluator does not model the write through the reference and +declines; the variable is then initialized at run time, with the same value. diff --git a/regression/cbmc-cpp/cpp20_constexpr_discarded_value_call_statement/main.cpp b/regression/cbmc-cpp/cpp20_constexpr_discarded_value_call_statement/main.cpp new file mode 100644 index 000000000000..3e06079abcb2 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_constexpr_discarded_value_call_statement/main.cpp @@ -0,0 +1,47 @@ +// N5008 [stmt.expr]/1: the expression of an expression statement is a +// discarded-value expression ([expr.context]/2); it is evaluated. A call +// in such a statement may appear in a constexpr function evaluated within a +// constant expression ([expr.const]/10 does not exclude it): here a +// precondition check whose result is ignored, as a library may write it. +extern "C" void __CPROVER_assert(bool, const char *); + +constexpr bool check(unsigned long i) noexcept +{ + return i < 4; +} + +struct view +{ + const char *str; + constexpr char operator[](unsigned long i) const + { + check(i); + return str[i]; + } +}; + +consteval view letters() +{ + return {"\tab"}; +} + +bool is_tab(char c) +{ + switch(c) + { + case letters()[0]: + return true; + default: + return false; + } +} + +int main() +{ + constexpr char second = letters()[1]; + __CPROVER_assert(second == 'a', "constant initializer"); + __CPROVER_assert(is_tab('\t'), "case label"); + __CPROVER_assert(!is_tab('a'), "default"); + __CPROVER_assert(is_tab('a'), "WRONG (must FAIL)"); + return 0; +} diff --git a/regression/cbmc-cpp/cpp20_constexpr_discarded_value_call_statement/test.desc b/regression/cbmc-cpp/cpp20_constexpr_discarded_value_call_statement/test.desc new file mode 100644 index 000000000000..0f1418d1e4cd --- /dev/null +++ b/regression/cbmc-cpp/cpp20_constexpr_discarded_value_call_statement/test.desc @@ -0,0 +1,20 @@ +KNOWNBUG +main.cpp +--cpp20 +^\[main\.assertion\.1\] line \d+ constant initializer: SUCCESS$ +^\[main\.assertion\.2\] line \d+ case label: SUCCESS$ +^\[main\.assertion\.3\] line \d+ default: SUCCESS$ +^\[main\.assertion\.4\] line \d+ WRONG \(must FAIL\): FAILURE$ +^\*\* 1 of \d+ failed +^VERIFICATION FAILED$ +^EXIT=10$ +^SIGNAL=0$ +-- +expected constant expression +^CONVERSION ERROR$ +-- +Fixed: cbmc's constant evaluator (cpp_constexpr_eval.cpp, +apply_side_effect) gave up on an expression statement that is a function +call, so operator[] was not evaluated: "expected constant expression" for +the case label, a conversion error. A call with no pointer or reference +argument that evaluates to a constant is now evaluated and discarded. diff --git a/regression/cbmc-cpp/cpp20_constexpr_dtor_side_effect/main.cpp b/regression/cbmc-cpp/cpp20_constexpr_dtor_side_effect/main.cpp new file mode 100644 index 000000000000..0e5eca745cba --- /dev/null +++ b/regression/cbmc-cpp/cpp20_constexpr_dtor_side_effect/main.cpp @@ -0,0 +1,52 @@ +// N5008 [dcl.constexpr] (P0784, C++20 constexpr destructors): a +// constexpr destructor's SIDE EFFECTS must not be dropped. The shape +// of libc++ vector's _ConstructTransaction: the destructor commits +// the container's new end pointer; marking constexpr members as +// constant-fold candidates swallowed the body and every +// initializer-list/range vector construction silently produced size 0 +// under --cpp20 (correct under --cpp17, where the destructor is not +// constexpr). +extern "C" void __CPROVER_assert(bool, const char *); +template +struct vec +{ + T *end_; + T buf[4]; + struct Tx + { + constexpr explicit Tx(vec &v, long n) + : v_(v), pos_(v.end_), new_end_(v.end_ + n) + { + } + constexpr ~Tx() + { + v_.end_ = pos_; + } + vec &v_; + T *pos_; + T *const new_end_; + + private: + Tx(Tx const &); + Tx &operator=(Tx const &); + }; + vec() : end_(buf) + { + } + void push3() + { + Tx tx(*this, 3); + tx.pos_ = tx.pos_ + 3; + } + long size() + { + return end_ - buf; + } +}; +int main() +{ + vec v; + v.push3(); + __CPROVER_assert(v.size() == 3, "transaction committed"); + return 0; +} diff --git a/regression/cbmc-cpp/cpp20_constexpr_dtor_side_effect/test.desc b/regression/cbmc-cpp/cpp20_constexpr_dtor_side_effect/test.desc new file mode 100644 index 000000000000..2a1f253ff439 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_constexpr_dtor_side_effect/test.desc @@ -0,0 +1,11 @@ +KNOWNBUG +main.cpp +--cpp20 +^\[main\.assertion\.1\] line \d+ transaction committed: SUCCESS$ +^VERIFICATION SUCCESSFUL$ +^EXIT=0$ +^SIGNAL=0$ +-- +dropped the body +-- +Header-free distillation of libc++ 's _ConstructTransaction. diff --git a/regression/cbmc-cpp/cpp20_constexpr_function_in_requirement_not_instantiated/main.cpp b/regression/cbmc-cpp/cpp20_constexpr_function_in_requirement_not_instantiated/main.cpp new file mode 100644 index 000000000000..e68093fd1a81 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_constexpr_function_in_requirement_not_instantiated/main.cpp @@ -0,0 +1,29 @@ +// N5008 [expr.const]/29.6, [temp.inst]/8, [expr.prim.req.simple]/1: a +// constexpr function template named in a requirement is neither odr-used +// nor needed for constant evaluation, so its definition is not +// instantiated (here it would be ill-formed: `w.value' of an incomplete +// class) +extern "C" void __CPROVER_assert(bool, const char *); +template +concept subtractable = requires(I a, I b) { a - b; }; +template +struct wrapper; +template +constexpr int operator-(const wrapper &w, const wrapper &) +{ + return w.value; +} +struct incomplete; +constexpr bool checked = subtractable>; +template +struct wrapper +{ + T value; +}; +int main() +{ + __CPROVER_assert(checked, "requirement satisfied"); + wrapper x{7}, y{1}; + __CPROVER_assert(x - y == 7, "instantiated when used"); + __CPROVER_assert(x - y == 6, "WRONG (must FAIL)"); +} diff --git a/regression/cbmc-cpp/cpp20_constexpr_function_in_requirement_not_instantiated/test.desc b/regression/cbmc-cpp/cpp20_constexpr_function_in_requirement_not_instantiated/test.desc new file mode 100644 index 000000000000..b42cccfd3965 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_constexpr_function_in_requirement_not_instantiated/test.desc @@ -0,0 +1,23 @@ +KNOWNBUG +main.cpp +--cpp20 +^\[main\.assertion\.1\] line \d+ requirement satisfied: SUCCESS$ +^\[main\.assertion\.2\] line \d+ instantiated when used: SUCCESS$ +^\[main\.assertion\.3\] line \d+ WRONG \(must FAIL\): FAILURE$ +^VERIFICATION FAILED$ +^EXIT=10$ +^SIGNAL=0$ +-- +^warning: ignoring +^CONVERSION ERROR$ +dropped the body of function +-- +N5008 [expr.const]/29.6, [temp.inst]/8: the requirement `a - b' of +subtractable> names operator-, a constexpr +function template specialization, in an unevaluated operand: it is not +needed for constant evaluation and its definition is not instantiated. +The front end converted constexpr specializations eagerly in a constant +expression, so `w.value' of wrapper was an error and the body +was dropped (bin53). This is the shape of libstdc++'s sized_sentinel_for +check of __normal_iterator<_BigBlock *, ...> in . g++ 13 +and clang++ 18 accept this program, and it fails only its WRONG assertion. diff --git a/regression/cbmc-cpp/cpp20_constexpr_local_class_with_array_member/main.cpp b/regression/cbmc-cpp/cpp20_constexpr_local_class_with_array_member/main.cpp new file mode 100644 index 000000000000..9a356543091d --- /dev/null +++ b/regression/cbmc-cpp/cpp20_constexpr_local_class_with_array_member/main.cpp @@ -0,0 +1,45 @@ +// N5008 [expr.const]: a constexpr function may declare a local of class type +// without an initializer ([basic.indet]/1.2: its bytes are erroneous) and +// assign its array member's elements before reading them; this is the shape +// of libstdc++'s __from_chars_alnum_to_val_table::_S_make_table. +extern "C" void __CPROVER_assert(bool, const char *); + +struct table +{ + unsigned char data[64]; +}; + +constexpr table make_uninitialized() +{ + table t; + for(int i = 0; i < 64; ++i) + t.data[i] = 127; + for(int i = 0; i < 10; ++i) + t.data['0' + i] = i; + return t; +} + +constexpr table make_value_initialized() +{ + table t{}; + for(int i = 0; i < 10; ++i) + t.data[i] = 2 * i; + return t; +} + +struct holder +{ + static constexpr table value = make_uninitialized(); +}; + +constexpr table plain = make_value_initialized(); + +int main() +{ + __CPROVER_assert(holder::value.data['7'] == 7, "digit"); + __CPROVER_assert(holder::value.data['!'] == 127, "other"); + __CPROVER_assert(plain.data[9] == 18, "assigned element"); + __CPROVER_assert(plain.data[10] == 0, "value-initialized element"); + __CPROVER_assert(holder::value.data['7'] == 8, "WRONG (must FAIL)"); + return 0; +} diff --git a/regression/cbmc-cpp/cpp20_constexpr_local_class_with_array_member/test.desc b/regression/cbmc-cpp/cpp20_constexpr_local_class_with_array_member/test.desc new file mode 100644 index 000000000000..6ee7dd09a83b --- /dev/null +++ b/regression/cbmc-cpp/cpp20_constexpr_local_class_with_array_member/test.desc @@ -0,0 +1,15 @@ +KNOWNBUG +main.cpp +--cpp20 --unwind 1 --no-unwinding-assertions +^\[main.assertion.1\] line 39 digit: SUCCESS$ +^\[main.assertion.2\] line 40 other: SUCCESS$ +^\[main.assertion.3\] line 41 assigned element: SUCCESS$ +^\[main.assertion.4\] line 42 value-initialized element: SUCCESS$ +^\[main.assertion.5\] line 43 WRONG \(must FAIL\): FAILURE$ +^EXIT=10$ +^SIGNAL=0$ +-- +^warning: ignoring +-- +The two tables are constant-initialized ([basic.start.static]/2) by the +constexpr evaluator; --unwind 1 would cut the loops if they ran at run time. diff --git a/regression/cbmc-cpp/cpp20_constexpr_virtual/main.cpp b/regression/cbmc-cpp/cpp20_constexpr_virtual/main.cpp new file mode 100644 index 000000000000..ccfc3c128d37 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_constexpr_virtual/main.cpp @@ -0,0 +1,22 @@ +// C++20 constexpr virtual functions +struct Base +{ + constexpr virtual int f() const + { + return 1; + } +}; +struct Derived : Base +{ + constexpr int f() const override + { + return 2; + } +}; + +int main() +{ + Derived d; + const Base &b = d; + __CPROVER_assert(b.f() == 2, "virtual dispatch"); +} diff --git a/regression/cbmc-cpp/cpp20_constexpr_virtual/test.desc b/regression/cbmc-cpp/cpp20_constexpr_virtual/test.desc new file mode 100644 index 000000000000..364d916d224e --- /dev/null +++ b/regression/cbmc-cpp/cpp20_constexpr_virtual/test.desc @@ -0,0 +1,9 @@ +KNOWNBUG +main.cpp +--cpp20 +^VERIFICATION SUCCESSFUL$ +^EXIT=0$ +^SIGNAL=0$ +-- +dropped the body +-- diff --git a/regression/cbmc-cpp/cpp20_constinit/main.cpp b/regression/cbmc-cpp/cpp20_constinit/main.cpp new file mode 100644 index 000000000000..9da7c2327efd --- /dev/null +++ b/regression/cbmc-cpp/cpp20_constinit/main.cpp @@ -0,0 +1,6 @@ +constinit int x = 42; + +int main() +{ + __CPROVER_assert(x == 42, "constinit"); +} diff --git a/regression/cbmc-cpp/cpp20_constinit/test.desc b/regression/cbmc-cpp/cpp20_constinit/test.desc new file mode 100644 index 000000000000..cc917c5704e8 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_constinit/test.desc @@ -0,0 +1,10 @@ +KNOWNBUG +main.cpp +--cpp20 +^VERIFICATION SUCCESSFUL$ +^EXIT=0$ +^SIGNAL=0$ +-- +dropped the body +-- +C++20 constinit variables. diff --git a/regression/cbmc-cpp/cpp20_constinit_verify/main.cpp b/regression/cbmc-cpp/cpp20_constinit_verify/main.cpp new file mode 100644 index 000000000000..9615987614c0 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_constinit_verify/main.cpp @@ -0,0 +1,7 @@ +// C++20 constinit +constinit int x = 42; +int main() +{ + __CPROVER_assert(x == 42, "constinit"); + return 0; +} diff --git a/regression/cbmc-cpp/cpp20_constinit_verify/test.desc b/regression/cbmc-cpp/cpp20_constinit_verify/test.desc new file mode 100644 index 000000000000..6b33ba0a9eb8 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_constinit_verify/test.desc @@ -0,0 +1,10 @@ +KNOWNBUG +main.cpp +--cpp20 +^VERIFICATION SUCCESSFUL$ +^EXIT=0$ +^SIGNAL=0$ +-- +dropped the body +-- +C++20 constinit variable diff --git a/regression/cbmc-cpp/cpp20_constrained_auto/main.cpp b/regression/cbmc-cpp/cpp20_constrained_auto/main.cpp new file mode 100644 index 000000000000..f1ac1a94cb61 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_constrained_auto/main.cpp @@ -0,0 +1,10 @@ +// C++20 constrained auto +template +concept Integral = __is_integral(T); + +int main() +{ + Integral auto x = 42; + __CPROVER_assert(x == 42, "constrained auto"); + return 0; +} diff --git a/regression/cbmc-cpp/cpp20_constrained_auto/test.desc b/regression/cbmc-cpp/cpp20_constrained_auto/test.desc new file mode 100644 index 000000000000..364d916d224e --- /dev/null +++ b/regression/cbmc-cpp/cpp20_constrained_auto/test.desc @@ -0,0 +1,9 @@ +KNOWNBUG +main.cpp +--cpp20 +^VERIFICATION SUCCESSFUL$ +^EXIT=0$ +^SIGNAL=0$ +-- +dropped the body +-- diff --git a/regression/cbmc-cpp/cpp20_constrained_converting_constructor_of_class_template/main.cpp b/regression/cbmc-cpp/cpp20_constrained_converting_constructor_of_class_template/main.cpp new file mode 100644 index 000000000000..0244c9234c3a --- /dev/null +++ b/regression/cbmc-cpp/cpp20_constrained_converting_constructor_of_class_template/main.cpp @@ -0,0 +1,36 @@ +// N5008 [over.match.viable]/3: a function whose associated constraints are +// not satisfied is not a viable candidate. In `iterator(iterator +// i) requires Const' (the converting constructor of a ranges iterator, +// libc++'s transform_view::__iterator) the constraint depends on the class +// template argument only: iterator has no such constructor to +// offer. The trailing requires-clause of a constructor was skipped by the +// parser, so iterator's copy considered converting from +// iterator, whose constructor copies an iterator ... and the +// front end recursed until it crashed. The satisfaction is checked when +// the constructor is a candidate ([temp.inst]/17). +extern "C" void __CPROVER_assert(bool, const char *); + +template +struct iterator +{ + int cur; + iterator() = default; + iterator(int c) : cur(c) + { + } + iterator(iterator i) + requires Const + : cur(i.cur + 1) + { + } +}; + +int main() +{ + iterator it = 3; + iterator cit = it; + __CPROVER_assert(it.cur == 3, "plain"); + __CPROVER_assert(cit.cur == 4, "converted"); + __CPROVER_assert(false, "WRONG (must FAIL)"); + return 0; +} diff --git a/regression/cbmc-cpp/cpp20_constrained_converting_constructor_of_class_template/test.desc b/regression/cbmc-cpp/cpp20_constrained_converting_constructor_of_class_template/test.desc new file mode 100644 index 000000000000..39dd12fa64b4 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_constrained_converting_constructor_of_class_template/test.desc @@ -0,0 +1,14 @@ +KNOWNBUG +main.cpp +--cpp20 +^\[main\.assertion\.[0-9]\] .* plain: SUCCESS$ +^\[main\.assertion\.[0-9]\] .* converted: SUCCESS$ +^\[main\.assertion\.3\] .* WRONG \(must FAIL\): FAILURE$ +^VERIFICATION FAILED$ +^EXIT=10$ +^SIGNAL=0$ +-- +^warning: ignoring +-- +g++ 13 and clang++ 18 accept this program, and it fails only its WRONG +assertion. diff --git a/regression/cbmc-cpp/cpp20_constrained_hidden_friend_per_specialization/main.cpp b/regression/cbmc-cpp/cpp20_constrained_hidden_friend_per_specialization/main.cpp new file mode 100644 index 000000000000..acf5e0b00a52 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_constrained_hidden_friend_per_specialization/main.cpp @@ -0,0 +1,74 @@ +// N5008 [temp.friend]/9: a friend function template with a constraint that +// depends on a template parameter of an enclosing template (`requires +// same_as') does not declare the same template as a declaration in +// any other scope: closure_base and closure_base> each +// define their own operator| templates. CBMC gave them one identifier (the +// enclosing argument substituted into the requires-clause was not part of +// it), kept the first specialization's (Tp = int), and `arr | c' took the +// closure | closure overload ("conversion from 'signed int [1l]' to 'struct +// closure_t'"). libc++'s __range_adaptor_closure<_Tp> (views::take) is +// written this way. +extern "C" void __CPROVER_assert(bool, const char *); +template +concept same_as = __is_same(T, U); +template +concept derived_from = __is_convertible(D, B); +template +struct is_lref +{ + static constexpr bool value = false; +}; +template +struct is_lref +{ + static constexpr bool value = true; +}; +template +concept viewable_range = is_lref::value; +template +struct closure_base; +template +struct closure_t : Fn, closure_base> +{ +}; +template +concept closure = derived_from>; +template +struct closure_base +{ + template + requires same_as + friend int operator|(View &&, C) + { + return 1; + } + template + requires same_as + friend int operator|(C, Other) + { + return 2; + } +}; +struct other : closure_base +{ +}; +struct bound +{ +}; +struct take_fn +{ + auto operator()(int) + { + return closure_t(); + } +} take; +int main() +{ + int arr[1] = {0}; + auto c = take(3); + __CPROVER_assert((arr | c) == 1, "range | closure"); + __CPROVER_assert((arr | other()) == 1, "other specialization"); + __CPROVER_assert((closure_t() | other()) == 2, "closure | closure"); + __CPROVER_assert(false, "WRONG (must FAIL)"); + return 0; +} diff --git a/regression/cbmc-cpp/cpp20_constrained_hidden_friend_per_specialization/test.desc b/regression/cbmc-cpp/cpp20_constrained_hidden_friend_per_specialization/test.desc new file mode 100644 index 000000000000..e3edf17666b7 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_constrained_hidden_friend_per_specialization/test.desc @@ -0,0 +1,17 @@ +KNOWNBUG +main.cpp +--cpp20 +^\[main\.assertion\.1\] line \d+ range \| closure: SUCCESS$ +^\[main\.assertion\.2\] line \d+ other specialization: SUCCESS$ +^\[main\.assertion\.3\] line \d+ closure \| closure: SUCCESS$ +^\[main\.assertion\.4\] line \d+ WRONG \(must FAIL\): FAILURE$ +^VERIFICATION FAILED$ +^EXIT=10$ +^SIGNAL=0$ +-- +^warning: ignoring +-- +function_template_identifier rendered the requires-clause without its +`type' sub-nodes, where the substituted enclosing argument lives; tag types +there are now rendered. g++ 13 and clang++ 18 accept this program, and it +fails only its WRONG assertion. diff --git a/regression/cbmc-cpp/cpp20_constrained_pack_partial_specialization_two_elements/main.cpp b/regression/cbmc-cpp/cpp20_constrained_pack_partial_specialization_two_elements/main.cpp new file mode 100644 index 000000000000..435406a81ab5 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_constrained_pack_partial_specialization_two_elements/main.cpp @@ -0,0 +1,27 @@ +extern "C" void __CPROVER_assert(bool, const char *); +// [temp.spec.partial.match]/2: P matches the constrained +// pack specialization (Args = {char, char}); the single-argument one does +// not match two arguments +template +struct P +{ + static constexpr int v = 0; +}; +template + requires(sizeof(A) > 0) +struct P +{ + static constexpr int v = 1; +}; +template + requires(sizeof(A) > 0) +struct P +{ + static constexpr int v = 2; +}; +int main() +{ + __CPROVER_assert(P::v == 2, "one element"); + __CPROVER_assert(P::v == 1, "two elements"); + __CPROVER_assert(P::v != 1, "WRONG (must FAIL)"); +} diff --git a/regression/cbmc-cpp/cpp20_constrained_pack_partial_specialization_two_elements/test.desc b/regression/cbmc-cpp/cpp20_constrained_pack_partial_specialization_two_elements/test.desc new file mode 100644 index 000000000000..e19eef5f8fd0 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_constrained_pack_partial_specialization_two_elements/test.desc @@ -0,0 +1,22 @@ +KNOWNBUG +main.cpp +--cpp20 +^\[main\.assertion\.1\] line \d+ one element: SUCCESS$ +^\[main\.assertion\.2\] line \d+ two elements: SUCCESS$ +^\[main\.assertion\.3\] line \d+ WRONG \(must FAIL\): FAILURE$ +^VERIFICATION FAILED$ +^EXIT=10$ +^SIGNAL=0$ +-- +^warning: ignoring +^CONVERSION ERROR$ +-- +N5008 [temp.spec.partial.match]/2: P matches the +constrained partial specialization `P' with Args = {char, char}. +The front end selected the primary template (n == 0, bin53): a +constrained specialization is re-matched in elaborate_class_template, whose +matcher let a trailing pack absorb a longer argument list only for two or +more packs. A single pack now does too. The same shape as libstdc++'s +views::__adaptor::_Partial. g++ +13 and clang++ 18 accept this program, and it fails only its WRONG +assertion. diff --git a/regression/cbmc-cpp/cpp20_constrained_partial_spec/main.cpp b/regression/cbmc-cpp/cpp20_constrained_partial_spec/main.cpp new file mode 100644 index 000000000000..5ac31e87fe4a --- /dev/null +++ b/regression/cbmc-cpp/cpp20_constrained_partial_spec/main.cpp @@ -0,0 +1,51 @@ +// C++20 selection among class-template partial specializations that share the +// same template-argument pattern and differ only by their requires-clauses +// ([temp.spec.partial.match]/1-2 with [temp.constr.order]). +// +// This is the shape of libstdc++'s std::__iterator_traits<_Iterator, void>, +// whose three specializations are distinguished solely by their constraints +// (__detail::__iter_with_nested_types vs __iter_without_nested_types && ...). +// The most-constrained *satisfied* specialization must be selected: here +// with_cat has a nested ::cat, so the has_cat-constrained specialization wins +// and traits::cat is char, not the no_cat fallback int. +#include + +namespace d +{ +template +concept has_cat = requires { typename T::cat; }; +template +concept no_cat = !requires { typename T::cat; }; +} // namespace d + +template +struct traits +{ +}; + +template + requires d::has_cat +struct traits +{ + using cat = typename T::cat; +}; + +template + requires d::no_cat +struct traits +{ + using cat = int; +}; + +struct with_cat +{ + typedef char cat; +}; + +int main() +{ + __CPROVER_assert( + std::is_same::cat, char>::value, + "constrained partial specialization selected by requires-clause"); + return 0; +} diff --git a/regression/cbmc-cpp/cpp20_constrained_partial_spec/test.desc b/regression/cbmc-cpp/cpp20_constrained_partial_spec/test.desc new file mode 100644 index 000000000000..e92bb51757b7 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_constrained_partial_spec/test.desc @@ -0,0 +1,24 @@ +KNOWNBUG +main.cpp +--cpp20 +^\[main\.assertion\.1\] line \d+ constrained partial specialization selected by requires-clause: SUCCESS$ +^VERIFICATION SUCCESSFUL$ +^EXIT=0$ +^SIGNAL=0$ +-- +^CONVERSION ERROR$ +^.*is unknown.*$ +dropped the body +-- +C++20 constrained partial specialization selection +([temp.spec.partial.match]/1-2, [temp.constr.order]): when several +class-template partial specializations share the same template-argument pattern +and differ only by their requires-clauses, the most-constrained satisfied one is +selected. + +This is the minimal model of libstdc++'s std::__iterator_traits<_Iterator, void> +specializations (distinguished by __iter_with_nested_types etc.). Previously the +front end kept whichever same-pattern specialization was matched first, ignoring +the requires-clause; it now follows ID_specialization_of back to the primary and +re-runs the constraint-aware selection for requires-clause-constrained +specializations too. diff --git a/regression/cbmc-cpp/cpp20_constrained_partial_specialization_member_as_variable_template_argument/defaulted_parameter.cpp b/regression/cbmc-cpp/cpp20_constrained_partial_specialization_member_as_variable_template_argument/defaulted_parameter.cpp new file mode 100644 index 000000000000..59b26c69f758 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_constrained_partial_specialization_member_as_variable_template_argument/defaulted_parameter.cpp @@ -0,0 +1,29 @@ +extern "C" void __CPROVER_assert(bool, const char *); +// [temp.spec.partial.match]/1, [temp.constr.decl]: a constrained partial +// specialization of a primary template with a defaulted parameter is +// matched against the completed argument list impl +template +struct impl +{ + using type = char; +}; +template + requires(sizeof(T1) > 0) +struct impl +{ + using type = T2; +}; +template + requires(sizeof(T1) > 99) +struct impl +{ + using type = T1; +}; +int main() +{ + __CPROVER_assert(sizeof(impl::type) == 8, "satisfied"); + __CPROVER_assert(sizeof(impl::type) == 8, "unsatisfied"); + __CPROVER_assert(sizeof(impl::type) == 1, "primary"); + __CPROVER_assert( + sizeof(impl::type) != 8, "WRONG (must FAIL)"); +} diff --git a/regression/cbmc-cpp/cpp20_constrained_partial_specialization_member_as_variable_template_argument/main.cpp b/regression/cbmc-cpp/cpp20_constrained_partial_specialization_member_as_variable_template_argument/main.cpp new file mode 100644 index 000000000000..d9bfc1dfe6d1 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_constrained_partial_specialization_member_as_variable_template_argument/main.cpp @@ -0,0 +1,29 @@ +extern "C" void __CPROVER_assert(bool, const char *); +// cvise reduction of libstdc++ 16's common_reference +template +constexpr bool is_long = __is_same(T, long); +template +struct is_same_c +{ + static const bool value = __is_same(T, U); +}; +template +using cond_res = Y; +template +struct impl; +// [temp.spec.partial.match]/1, [temp.constr.decl]: a constrained partial +// specialization, selected for impl +template + requires requires { typename cond_res; } +struct impl +{ + using type = cond_res; +}; +int main() +{ + __CPROVER_assert( + is_same_c::type, long>::value, "class template argument"); + __CPROVER_assert( + is_long::type>, "variable template argument"); + __CPROVER_assert(!is_long::type>, "WRONG (must FAIL)"); +} diff --git a/regression/cbmc-cpp/cpp20_constrained_partial_specialization_member_as_variable_template_argument/test.desc b/regression/cbmc-cpp/cpp20_constrained_partial_specialization_member_as_variable_template_argument/test.desc new file mode 100644 index 000000000000..5495c54d352f --- /dev/null +++ b/regression/cbmc-cpp/cpp20_constrained_partial_specialization_member_as_variable_template_argument/test.desc @@ -0,0 +1,26 @@ +KNOWNBUG +main.cpp +--cpp20 +^\[main\.assertion\.1\] line \d+ class template argument: SUCCESS$ +^\[main\.assertion\.2\] line \d+ variable template argument: SUCCESS$ +^\[main\.assertion\.3\] line \d+ WRONG \(must FAIL\): FAILURE$ +^VERIFICATION FAILED$ +^EXIT=10$ +^SIGNAL=0$ +-- +^warning: ignoring +^CONVERSION ERROR$ +-- +N5008 [temp.spec.partial.match]/1, [temp.constr.decl], [temp.arg.type]: +impl selects the constrained partial specialization, whose +`type' is long; that type is a valid template argument of any template. +The front end failed ("found no match for symbol 'is_long'", bin53): a +constrained specialization is re-matched in elaborate_class_template, whose +matcher compared the written argument list with the completed + and never matched. The written list is now completed with +the primary's default arguments, as disambiguate_template_classes does. +test_defaulted_parameter.desc: satisfied, unsatisfied and primary cases. +cvise reduction (/tmp/r163/red/kb_L16cr) of libstdc++ 16's +`is_same_v, long>' +(cpp20_common_reference_int_lvalue_rvalue with GCC 16's headers). g++ 13 +and clang++ 18 accept the program, and it fails only its WRONG assertion. diff --git a/regression/cbmc-cpp/cpp20_constrained_partial_specialization_member_as_variable_template_argument/test_defaulted_parameter.desc b/regression/cbmc-cpp/cpp20_constrained_partial_specialization_member_as_variable_template_argument/test_defaulted_parameter.desc new file mode 100644 index 000000000000..72814cb7463f --- /dev/null +++ b/regression/cbmc-cpp/cpp20_constrained_partial_specialization_member_as_variable_template_argument/test_defaulted_parameter.desc @@ -0,0 +1,17 @@ +KNOWNBUG +defaulted_parameter.cpp +--cpp20 +^\[main\.assertion\.1\] line \d+ satisfied: SUCCESS$ +^\[main\.assertion\.2\] line \d+ unsatisfied: SUCCESS$ +^\[main\.assertion\.3\] line \d+ primary: SUCCESS$ +^\[main\.assertion\.4\] line \d+ WRONG \(must FAIL\): FAILURE$ +^VERIFICATION FAILED$ +^EXIT=10$ +^SIGNAL=0$ +-- +^warning: ignoring +^CONVERSION ERROR$ +-- +N5008 [temp.spec.partial.match]/1, [temp.constr.decl]; see test.desc. +Fails on bin53. g++ 13 and clang++ 18 accept this program, and it fails +only its WRONG assertion. diff --git a/regression/cbmc-cpp/cpp20_constrained_partial_specialization_reached_through_base_chain/main.cpp b/regression/cbmc-cpp/cpp20_constrained_partial_specialization_reached_through_base_chain/main.cpp new file mode 100644 index 000000000000..0e4ea44ef2b6 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_constrained_partial_specialization_reached_through_base_chain/main.cpp @@ -0,0 +1,23 @@ +extern "C" void __CPROVER_assert(bool, const char *); +// The shape of libstdc++ 16's __common_reference_impl<_Tp1, _Tp2, _Bullet>: +// each specialization derives from the next one until a (constrained) +// partial specialization matches ([temp.spec.partial.match]/1, +// [temp.constr.decl]/1). impl needs two steps: impl, then +// the partial specialization impl. +template +struct impl : impl +{ +}; +template + requires true +struct impl +{ + using type = T; +}; +int main() +{ + // impl must not be instantiated first: then the chain works + __CPROVER_assert(__is_same(impl::type, int), "two steps"); + __CPROVER_assert(__is_same(impl::type, int), "one step"); + __CPROVER_assert(!__is_same(impl::type, int), "WRONG (must FAIL)"); +} diff --git a/regression/cbmc-cpp/cpp20_constrained_partial_specialization_reached_through_base_chain/test.desc b/regression/cbmc-cpp/cpp20_constrained_partial_specialization_reached_through_base_chain/test.desc new file mode 100644 index 000000000000..b10601d2665a --- /dev/null +++ b/regression/cbmc-cpp/cpp20_constrained_partial_specialization_reached_through_base_chain/test.desc @@ -0,0 +1,30 @@ +KNOWNBUG +main.cpp +--cpp20 +^\[main\.assertion\.1\] line \d+ two steps: SUCCESS$ +^\[main\.assertion\.2\] line \d+ one step: SUCCESS$ +^\[main\.assertion\.3\] line \d+ WRONG \(must FAIL\): FAILURE$ +^VERIFICATION FAILED$ +^EXIT=10$ +^SIGNAL=0$ +-- +^warning: ignoring +^CONVERSION ERROR$ +-- +N5008 [temp.spec.partial.match]/1, [temp.constr.decl]/1: impl +derives from impl, which derives from impl, an instance of +the constrained partial specialization. The front end failed silently +("could not fully type-check 'main'", bin53): elaborate_class_template cut +off recursion of a template after two enclosing instances unless the +arguments converge, and for a constrained partial specialization (re-matched +from the primary) it counted the primary's instances, so impl was +never instantiated and impl lost its base. Each partial +specialization is a template of its own ([temp.spec.partial.general]/2); +the bound now counts the specialization's instances. test_unsatisfied.desc: +unsatisfied constrained specializations for B = 1 and 2; when none matched, +the primary was instantiated with the specialization's arguments, B unbound, +and impl named impl itself (crash on bin53, "a class +cannot be derived from itself" since round 163t). This was the root cause +of cpp20_common_reference_int_lvalue_rvalue failing with the libstdc++ 16 +headers. g++ 13 and clang++ 18 accept both programs, and they fail only +their WRONG assertion. diff --git a/regression/cbmc-cpp/cpp20_constrained_partial_specialization_reached_through_base_chain/test_unsatisfied.desc b/regression/cbmc-cpp/cpp20_constrained_partial_specialization_reached_through_base_chain/test_unsatisfied.desc new file mode 100644 index 000000000000..be96219247e8 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_constrained_partial_specialization_reached_through_base_chain/test_unsatisfied.desc @@ -0,0 +1,17 @@ +KNOWNBUG +unsatisfied.cpp +--cpp20 +^\[main\.assertion\.1\] line \d+ bullet 3: SUCCESS$ +^\[main\.assertion\.2\] line \d+ WRONG \(must FAIL\): FAILURE$ +^VERIFICATION FAILED$ +^EXIT=10$ +^SIGNAL=0$ +-- +^warning: ignoring +^CONVERSION ERROR$ +-- +See test.desc. With unsatisfied constrained partial specializations for +B = 1 and 2 ([temp.spec.partial.match]/2: they do not match), impl +must derive from impl and that from the partial specialization +impl. Crashed on bin53 (the class ended up its own base). g++ 13 +and clang++ 18 accept this program, and it fails only its WRONG assertion. diff --git a/regression/cbmc-cpp/cpp20_constrained_partial_specialization_reached_through_base_chain/unsatisfied.cpp b/regression/cbmc-cpp/cpp20_constrained_partial_specialization_reached_through_base_chain/unsatisfied.cpp new file mode 100644 index 000000000000..74383832496f --- /dev/null +++ b/regression/cbmc-cpp/cpp20_constrained_partial_specialization_reached_through_base_chain/unsatisfied.cpp @@ -0,0 +1,32 @@ +extern "C" void __CPROVER_assert(bool, const char *); +// As main.cpp, with unsatisfied constrained partial specializations on the +// way ([temp.spec.partial.match]/2: a partial specialization whose +// constraints are not satisfied does not match), as in libstdc++ 16's +// common_reference, which reaches bullet 4 +template +struct impl : impl +{ +}; +template + requires false +struct impl +{ + using type = void; +}; +template + requires false +struct impl +{ + using type = void; +}; +template + requires true +struct impl +{ + using type = T; +}; +int main() +{ + __CPROVER_assert(__is_same(impl::type, int), "bullet 3"); + __CPROVER_assert(!__is_same(impl::type, int), "WRONG (must FAIL)"); +} diff --git a/regression/cbmc-cpp/cpp20_constrained_partial_specializations_same_pattern/main.cpp b/regression/cbmc-cpp/cpp20_constrained_partial_specializations_same_pattern/main.cpp new file mode 100644 index 000000000000..2390a43e0fea --- /dev/null +++ b/regression/cbmc-cpp/cpp20_constrained_partial_specializations_same_pattern/main.cpp @@ -0,0 +1,82 @@ +// N5008 [temp.spec.partial.general], [temp.constr.decl]: same-pattern partial +// specializations told apart by their constraints (the __iter_concept shape). +struct rat +{ +}; +struct fwd +{ +}; +struct WithConcept +{ + using iterator_concept = fwd; + using iterator_category = rat; +}; +struct WithCategory +{ + using iterator_category = rat; +}; +struct Neither +{ +}; + +// the requirements name members of the ITERATOR TYPE itself (or of a pointer +// wrapper), so that an absent member is a substitution failure in the +// immediate context, not an error inside a class template instantiation +template +struct traits +{ + using type = I; +}; +template +struct traits +{ + struct type + { + }; +}; +template +using traits_t = typename traits::type; + +template +struct impl; + +template + requires requires { typename traits_t::iterator_concept; } +struct impl +{ + using type = typename traits_t::iterator_concept; +}; + +template + requires( + !requires { typename traits_t::iterator_concept; } && + requires { typename traits_t::iterator_category; }) +struct impl +{ + using type = typename traits_t::iterator_category; +}; + +template + requires( + !requires { typename traits_t::iterator_concept; } && + !requires { typename traits_t::iterator_category; }) +struct impl +{ + using type = rat; +}; + +template +struct impl +{ +}; + +template +using concept_t = typename impl::type; + +int main() +{ + static_assert(__is_same(concept_t, fwd), "iterator_concept"); + static_assert(__is_same(concept_t, rat), "iterator_category"); + static_assert(__is_same(concept_t, rat), "pointer: default"); + return 0; +} diff --git a/regression/cbmc-cpp/cpp20_constrained_partial_specializations_same_pattern/test.desc b/regression/cbmc-cpp/cpp20_constrained_partial_specializations_same_pattern/test.desc new file mode 100644 index 000000000000..234f08dcda7b --- /dev/null +++ b/regression/cbmc-cpp/cpp20_constrained_partial_specializations_same_pattern/test.desc @@ -0,0 +1,18 @@ +KNOWNBUG +main.cpp +--cpp20 +^VERIFICATION SUCCESSFUL$ +^EXIT=0$ +^SIGNAL=0$ +-- +^warning: ignoring +^CONVERSION ERROR$ +dropped the body +-- +N5008 [temp.spec.partial.general]/2 + [temp.constr.decl]: partial +specializations with the same argument pattern `impl` that differ only in +their requires-clauses (nested requires-expressions with type requirements, +negations, conjunctions) are distinct specializations; the one whose +constraints are satisfied is selected (libstdc++'s three +__iter_concept_impl<_Iter> specializations). Before, their symbols collided +on an identifier that rendered only the constraint's names. diff --git a/regression/cbmc-cpp/cpp20_constrained_prospective_destructor_selection/main.cpp b/regression/cbmc-cpp/cpp20_constrained_prospective_destructor_selection/main.cpp new file mode 100644 index 000000000000..85139e68ab60 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_constrained_prospective_destructor_selection/main.cpp @@ -0,0 +1,51 @@ +extern "C" void __CPROVER_assert(bool, const char *); +// N5008 [class.dtor]/4: overload resolution among the prospective +// destructors selects the one whose constraints are satisfied; the other's +// definition is not instantiated ([temp.inst]/4), so its call of the +// constrained destroy() is never checked for holder (libc++'s +// std::expected::__repr) +int destroyed = 0; +struct nt; +template +constexpr bool trivial = true; +template <> +constexpr bool trivial = false; +template +struct holder +{ + T v; + constexpr ~holder() + requires(trivial) + = default; + constexpr ~holder() + requires(!trivial) + { + destroy(); + } + +private: + void destroy() + requires(!trivial) + { + ++destroyed; + } +}; +struct nt +{ + ~nt() + { + } +}; +int main() +{ + { + holder h{1}; + __CPROVER_assert(h.v == 1, "trivial"); + } + { + holder n{}; + } + __CPROVER_assert(destroyed == 1, "non-trivial destroyed once"); + __CPROVER_assert(destroyed == 2, "WRONG (must FAIL)"); + return 0; +} diff --git a/regression/cbmc-cpp/cpp20_constrained_prospective_destructor_selection/test.desc b/regression/cbmc-cpp/cpp20_constrained_prospective_destructor_selection/test.desc new file mode 100644 index 000000000000..984a89b65ebb --- /dev/null +++ b/regression/cbmc-cpp/cpp20_constrained_prospective_destructor_selection/test.desc @@ -0,0 +1,16 @@ +KNOWNBUG +main.cpp +--cpp20 +^\[main\.assertion\.1\] line \d+ trivial: SUCCESS$ +^\[main\.assertion\.2\] line \d+ non-trivial destroyed once: SUCCESS$ +^\[main\.assertion\.3\] line \d+ WRONG \(must FAIL\): FAILURE$ +^VERIFICATION FAILED$ +^EXIT=10$ +^SIGNAL=0$ +-- +^warning: ignoring +^CONVERSION ERROR$ +found no match for symbol 'destroy' +-- +Destructor calls took the first prospective destructor, so holder ran +the defaulted one, and the unselected destructor's body was instantiated. diff --git a/regression/cbmc-cpp/cpp20_constrained_twin_of_deleted_member/main.cpp b/regression/cbmc-cpp/cpp20_constrained_twin_of_deleted_member/main.cpp new file mode 100644 index 000000000000..fd4efbf64ea5 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_constrained_twin_of_deleted_member/main.cpp @@ -0,0 +1,55 @@ +// N5008 [over.match.best.general]/2.6 with [temp.constr.order]: two member +// functions with the same signature, one deleted and unconstrained and one with +// a trailing requires-clause (libstdc++'s C++20 std::pair: `pair +// &operator=(const pair &) = delete;' beside `constexpr pair &operator=(const +// pair &) requires (_S_assignable())'); the +// constrained one is more constrained and is selected. Look-up found the +// deleted one ("operator= is not accessible"), and the requires-clause's `( +// expression )' -- a call -- was not parsed at all ([temp.pre]: a +// primary-expression). A constrained member whose constraints do not hold +// (pair's move assignment) is not viable and its body is not +// instantiated ([temp.inst]/4): its failing conversion is no dropped body. +extern "C" void __CPROVER_assert(bool, const char *); +template +struct pair +{ + T1 first; + T2 second; + constexpr pair(T1 a, T2 b) : first(a), second(b) + { + } + template + static constexpr bool assignable() + { + return __is_assignable(T1 &, U1) && __is_assignable(T2 &, U2); + } + pair &operator=(const pair &) = delete; + constexpr pair &operator=(const pair &p) + requires(assignable()) + { + first = p.first; + second = p.second; + return *this; + } + constexpr pair &operator=(pair &&p) + requires(assignable()) + { + first = static_cast(p.first); + second = static_cast(p.second); + return *this; + } +}; +int main() +{ + pair q(3, 4), r(0, 0); + r = q; + __CPROVER_assert( + r.second == 4, "constrained operator= beats the deleted one"); + pair m(5, 6); + r = static_cast &&>(m); + __CPROVER_assert(r.first == 5, "constrained move assignment"); + pair c(7, 8); + __CPROVER_assert( + c.first == 7, "const member pair: assignment not viable, not instantiated"); + __CPROVER_assert(r.second == 3, "WRONG (must FAIL)"); +} diff --git a/regression/cbmc-cpp/cpp20_constrained_twin_of_deleted_member/test.desc b/regression/cbmc-cpp/cpp20_constrained_twin_of_deleted_member/test.desc new file mode 100644 index 000000000000..9071870cea75 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_constrained_twin_of_deleted_member/test.desc @@ -0,0 +1,21 @@ +KNOWNBUG +main.cpp +--cpp20 +^EXIT=10$ +^SIGNAL=0$ +^\[main\.assertion\.1\] line \d+ constrained operator= beats the deleted one: SUCCESS$ +^\[main\.assertion\.2\] line \d+ constrained move assignment: SUCCESS$ +^\[main\.assertion\.3\] line \d+ const member pair: assignment not viable, not instantiated: SUCCESS$ +^\[main\.assertion\.4\] line \d+ WRONG \(must FAIL\): FAILURE$ +^VERIFICATION FAILED$ +-- +^warning: ignoring +^CONVERSION ERROR$ +not accessible +dropped the body +-- +N5008 [over.match.best.general]/2.6: the constrained same-signature member is +selected over the deleted unconstrained one; [temp.pre]: `requires ( expr )' +takes any expression; [temp.inst]/4: an unsatisfied constrained member's +definition is not instantiated (no dropped-body report). The C++20 +std::pair shape (`std::pair r; r = q;' was a conversion error). diff --git a/regression/cbmc-cpp/cpp20_constraint_conjunction_short_circuit/main.cpp b/regression/cbmc-cpp/cpp20_constraint_conjunction_short_circuit/main.cpp new file mode 100644 index 000000000000..d7a103153007 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_constraint_conjunction_short_circuit/main.cpp @@ -0,0 +1,35 @@ +extern "C" void __CPROVER_assert(bool, const char *); +template +inline constexpr bool conv_v = __is_convertible(F, T); +template +struct ref_of; +template +struct ref_of +{ + using type = T &; +}; +template +using ref_of_t = typename ref_of::type; +template +struct pick : pick +{ +}; +// [temp.constr.op]/2: the second operand of the conjunction is not +// substituted into when the first is not satisfied +template + requires requires { typename ref_of_t; } && conv_v, T> +struct pick +{ + static constexpr int value = 1; +}; +template +struct pick +{ + static constexpr int value = 2; +}; +int main() +{ + __CPROVER_assert(pick::value == 1, "first satisfied"); + __CPROVER_assert(pick::value == 2, "first not satisfied"); + __CPROVER_assert(pick::value == 1, "WRONG (must FAIL)"); +} diff --git a/regression/cbmc-cpp/cpp20_constraint_conjunction_short_circuit/test.desc b/regression/cbmc-cpp/cpp20_constraint_conjunction_short_circuit/test.desc new file mode 100644 index 000000000000..5d9970bd589e --- /dev/null +++ b/regression/cbmc-cpp/cpp20_constraint_conjunction_short_circuit/test.desc @@ -0,0 +1,24 @@ +KNOWNBUG +main.cpp +--cpp20 +^\[main\.assertion\.1\] line \d+ first satisfied: SUCCESS$ +^\[main\.assertion\.2\] line \d+ first not satisfied: SUCCESS$ +^\[main\.assertion\.3\] line \d+ WRONG \(must FAIL\): FAILURE$ +^VERIFICATION FAILED$ +^EXIT=10$ +^SIGNAL=0$ +-- +^warning: ignoring +^CONVERSION ERROR$ +dropped the body +-- +N5008 [temp.constr.op]/2: a conjunction checks its first operand and is not +satisfied if that is not, without substituting into the second. The +partial specialization pick requires `requires { typename +ref_of_t; } && conv_v, T>'; for T = int the first operand +is false and the second is ill-formed. The front end type-checked the +whole conjunction, the second operand failed, and the clause was taken as +satisfied, so pick selected pick. The shape of libstdc++ +16's __common_reference_impl<_Tp1, _Tp2, 1> (common_reference_t, cpp20_common_reference_int_lvalue_rvalue with GCC 16). Fails on +bin53. g++ 13 and clang++ 18 accept the program. diff --git a/regression/cbmc-cpp/cpp20_constraint_ordering_among_viable_candidates/main.cpp b/regression/cbmc-cpp/cpp20_constraint_ordering_among_viable_candidates/main.cpp new file mode 100644 index 000000000000..a97d506c14b4 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_constraint_ordering_among_viable_candidates/main.cpp @@ -0,0 +1,34 @@ +extern "C" void __CPROVER_assert(bool, const char *); +template +concept C1 = sizeof(T) > 0; +template +concept CC = C1 && sizeof(T) == sizeof(int); +// [over.match.best.general]/2.5, [temp.func.order]/8.4: the more constrained of +// two viable candidates with equivalent parameter lists is better ... +template +int f(T) +{ + return 1; +} +template +int f(T) +{ + return 2; +} +// ... but constraints never remove a candidate that is viable when the more +// constrained one is not, or whose parameter list differs (libstdc++'s +// ranges::copy: the iterator overload next to the range overload) +template +int g(I, I) +{ + return 3; +} +template +int g(); +int main() +{ + __CPROVER_assert(f(1) == 2, "more constrained viable"); + __CPROVER_assert(f(1.0) == 1, "more constrained not viable"); + __CPROVER_assert(g(1, 2) == 3, "different parameter list"); + __CPROVER_assert(f(1) != 2, "WRONG (must FAIL)"); +} diff --git a/regression/cbmc-cpp/cpp20_constraint_ordering_among_viable_candidates/test.desc b/regression/cbmc-cpp/cpp20_constraint_ordering_among_viable_candidates/test.desc new file mode 100644 index 000000000000..ff3c1d2ba4fc --- /dev/null +++ b/regression/cbmc-cpp/cpp20_constraint_ordering_among_viable_candidates/test.desc @@ -0,0 +1,26 @@ +KNOWNBUG +main.cpp +--cpp20 +^\[main\.assertion\.1\] line \d+ more constrained viable: SUCCESS$ +^\[main\.assertion\.2\] line \d+ more constrained not viable: SUCCESS$ +^\[main\.assertion\.3\] line \d+ different parameter list: SUCCESS$ +^\[main\.assertion\.4\] line \d+ WRONG \(must FAIL\): FAILURE$ +^VERIFICATION FAILED$ +^EXIT=10$ +^SIGNAL=0$ +-- +^warning: ignoring +^CONVERSION ERROR$ +-- +N5008 [over.match.best.general]/2.5, [temp.func.order]/8: constraints order two +function templates only when both specializations are viable and the +templates' function parameter lists are equivalent; the more constrained +one ([temp.constr.order]/5) is then better. The front end removed the +less constrained candidate before deduction: f(1.0) lost `template +f(T)' because `template f(T)' is more constrained, although CC +is false; g(1, 2) lost `template g(I, I)' to the unrelated +`template g()' (by constraint names alone). The second shape is +libstdc++'s std::ranges::copy(first, last, out), whose iterator overload +was dropped for the range overload ("found no match for symbol +'operator()'", ranges_algobase.h:311). bin53: CONVERSION ERROR. g++ 13 +and clang++ 18 accept this program, and it fails only its WRONG assertion. diff --git a/regression/cbmc-cpp/cpp20_constraint_substitution_failure/main.cpp b/regression/cbmc-cpp/cpp20_constraint_substitution_failure/main.cpp new file mode 100644 index 000000000000..2c3e8dfc40d6 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_constraint_substitution_failure/main.cpp @@ -0,0 +1,50 @@ +// N5008 [temp.constr.atomic]/3: if substituting into an atomic +// constraint's parameter mapping fails, the constraint is NOT +// satisfied -- it is not an error. Here common_reference_t +// (whose primary template has no ::type, mirroring libc++'s +// common_reference when none exists) fails to substitute inside +// same_as's argument, so common_reference_with must be +// FALSE and the unconstrained use() overload must win (g++ and +// clang++ return 42). CBMC selects the CONSTRAINED overload +// (wrong code, returns 41). In full libc++ builds the same +// machinery surfaces as a hard "found no match for symbol 'same_as'" +// inside reverse_iterator's iterator_concept; root of the cpp20 +// *_libcxx failures (vector/map/ranges/erase_if/initializer_list). +extern "C" void __CPROVER_assert(bool, const char *); + +template +concept same_as = __is_same(T, U); + +template +struct common_reference +{ + // primary: no ::type (mirrors libc++ when no common reference exists) +}; + +template +using common_reference_t = typename common_reference::type; + +template +concept common_reference_with = same_as>; + +template +int use(T v) + requires common_reference_with +{ + return v; +} + +template +int use(T v) +{ + return v + 1; +} + +int main() +{ + // common_reference_t has no ::type: substitution failure in + // the concept's argument makes the constraint UNSATISFIED + // ([temp.constr.atomic]/3), so the unconstrained overload wins. + __CPROVER_assert(use(41) == 42, "unsatisfied constraint, not an error"); + return 0; +} diff --git a/regression/cbmc-cpp/cpp20_constraint_substitution_failure/test.desc b/regression/cbmc-cpp/cpp20_constraint_substitution_failure/test.desc new file mode 100644 index 000000000000..1774107b64ef --- /dev/null +++ b/regression/cbmc-cpp/cpp20_constraint_substitution_failure/test.desc @@ -0,0 +1,15 @@ +KNOWNBUG +main.cpp +--cpp20 +^\[main\.assertion\.1\] line \d+ unsatisfied constraint, not an error: SUCCESS$ +^VERIFICATION SUCCESSFUL$ +^EXIT=0$ +^SIGNAL=0$ +-- +dropped the body +-- +Fixed 2026-07-28: the reference-type functional-cast fix +([expr.type.conv]/1 pod-constructor synthesis for reference types) +removes the failure inside the concept-machinery instantiation that +previously poisoned the second resolution pass; the unconstrained +overload wins and the program verifies non-vacuously. diff --git a/regression/cbmc-cpp/cpp20_construct_at_empty_pack_placement_new/main.cpp b/regression/cbmc-cpp/cpp20_construct_at_empty_pack_placement_new/main.cpp new file mode 100644 index 000000000000..e38c4092795a --- /dev/null +++ b/regression/cbmc-cpp/cpp20_construct_at_empty_pack_placement_new/main.cpp @@ -0,0 +1,51 @@ +extern "C" void __CPROVER_assert(bool, const char *); +typedef unsigned long size_t; +void *operator new(size_t, void *p) noexcept +{ + return p; +} +// libc++ <__memory/construct_at.h>: the constraint is a placement-new inside +// decltype whose new-initializer expands the parameter pack; the pack is not +// the last template parameter ([temp.param]/18) +namespace std +{ +template +T &&declval() noexcept; +template +T *addressof(T &r) noexcept +{ + return __builtin_addressof(r); +} +template +void *__voidify(T &loc) noexcept +{ + return const_cast(static_cast(addressof(loc))); +} +template < + class T, + class... Args, + class = decltype(::new(std::declval()) T(std::declval()...))> +constexpr T *construct_at(T *loc, Args &&...args) +{ + return ::new(std::__voidify(*loc)) T(static_cast(args)...); +} +} // namespace std +struct point +{ + int x, y; + point(int a, int b) : x(a), y(b) + { + } +}; +int main() +{ + char buf[4] = {'a', 'b', 'c', 'd'}; + std::construct_at(std::addressof(buf[1])); + __CPROVER_assert( + buf[0] == 'a', + "value-initialization of a char is allowed by the default argument"); + alignas(point) unsigned char raw[sizeof(point)]; + point *p = std::construct_at(reinterpret_cast(raw), 3, 4); + __CPROVER_assert(p->x == 3 && p->y == 4, "constructor arguments forwarded"); + __CPROVER_assert(p->x == 4, "WRONG (must FAIL)"); +} diff --git a/regression/cbmc-cpp/cpp20_construct_at_empty_pack_placement_new/test.desc b/regression/cbmc-cpp/cpp20_construct_at_empty_pack_placement_new/test.desc new file mode 100644 index 000000000000..ae71b8e1cacc --- /dev/null +++ b/regression/cbmc-cpp/cpp20_construct_at_empty_pack_placement_new/test.desc @@ -0,0 +1,26 @@ +KNOWNBUG +main.cpp +--cpp20 +^\[main\.assertion\.1\] line \d+ value-initialization of a char is allowed by the default argument: SUCCESS$ +^\[main\.assertion\.2\] line \d+ constructor arguments forwarded: SUCCESS$ +^\[main\.assertion\.3\] line \d+ WRONG \(must FAIL\): FAILURE$ +^VERIFICATION FAILED$ +^EXIT=10$ +^SIGNAL=0$ +-- +^warning: ignoring +^CONVERSION ERROR$ +could not fully type-check +dropped the body +is unknown$ +-- +N5008 [expr.new]/1 + [temp.variadic]/6.5: a new-initializer's expression-list +is a pack-expansion context, and [temp.param]/18: a function template's +parameter pack need not be its last template parameter. libc++'s +`template ()) +T(declval()...))> construct_at(T *, Args &&...)' called with NO +arguments (basic_string::__begin_lifetime) failed twice: the empty pack in +the constraint's new-initializer was not expanded before type-checking (no +viable candidate), and the instantiation-time empty-pack strip only looked +at a TRAILING pack, leaving `static_cast(args)...' in the body +("symbol 'args' is unknown"). diff --git a/regression/cbmc-cpp/cpp20_constructor_requires_clause/main.cpp b/regression/cbmc-cpp/cpp20_constructor_requires_clause/main.cpp new file mode 100644 index 000000000000..fca3dee07037 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_constructor_requires_clause/main.cpp @@ -0,0 +1,44 @@ +// A constrained constructor template whose requires-clause is *not* satisfied +// must be removed from overload resolution ([temp.constr.decl]/1, +// [over.match.viable]) so a better-constrained / unconstrained constructor is +// chosen instead. +// +// This mirrors libstdc++ std::span's two constructors: +// span(pointer __first, size_type __count); // (1) +// template _End> +// requires (!is_convertible_v<_End, size_type>) +// span(_It __first, _End __last); // (2) +// For `span(ptr, 5)` the second argument 5 (int) is convertible to size_type, +// so constructor (2)'s requires-clause `!is_convertible_v<_End, size_type>` is +// *false* and (2) must be discarded, leaving (1). CBMC used to leave the +// substituted atomic constraint `is_convertible_v` as an +// unfolded comparison (notequal(1, 0)); the tri-state constraint evaluator then +// reported "unknown" and kept (2), which was wrongly selected. +// +// Here `which == 1` holds iff the unconstrained (pointer, count) constructor is +// selected. The assertion is non-vacuous: were the constrained overload kept, +// `which` would be 2. +#include + +struct S +{ + int which; + S(int *, unsigned long) : which(1) + { + } + template + requires(!std::is_convertible_v) + S(int *, U) : which(2) + { + } +}; + +int main() +{ + int arr[3]; + S s( + arr, 2); // 2 (int) is convertible to unsigned long -> overload (2) removed + __CPROVER_assert( + s.which == 1, "unsatisfied requires-clause removes the constrained ctor"); + return 0; +} diff --git a/regression/cbmc-cpp/cpp20_constructor_requires_clause/test.desc b/regression/cbmc-cpp/cpp20_constructor_requires_clause/test.desc new file mode 100644 index 000000000000..e88049128239 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_constructor_requires_clause/test.desc @@ -0,0 +1,21 @@ +KNOWNBUG +main.cpp +--cpp20 +^\[main\.assertion\.1\] line \d+ unsatisfied requires-clause removes the constrained ctor: SUCCESS$ +^VERIFICATION SUCCESSFUL$ +^EXIT=0$ +^SIGNAL=0$ +-- +^CONVERSION ERROR$ +^.*operator '-' not defined.*$ +dropped the body +-- +A constructor template whose requires-clause is unsatisfied for the deduced +arguments must be removed from overload resolution ([temp.constr.decl]/1, +[over.match.viable]/3). CBMC evaluated the requires-clause but left an atomic +constraint written with a type trait (here !is_convertible_v) +as an unfolded comparison, so the tri-state evaluator returned "unknown" and +kept the candidate. The fix constant-folds (simplify) the substituted +requires-clause before evaluating it. This is the header-free analogue of the +libstdc++ std::span(ptr, count) vs span(_It, _End) selection (see cpp20_span / +cpp20_span_basic). diff --git a/regression/cbmc-cpp/cpp20_conversion_construction_recursion/main.cpp b/regression/cbmc-cpp/cpp20_conversion_construction_recursion/main.cpp new file mode 100644 index 000000000000..6530df91d897 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_conversion_construction_recursion/main.cpp @@ -0,0 +1,56 @@ +// Mutually-convertible class types that each provide a templated integral +// constructor and an explicit converting constructor taking the other type +// (a minimal model of libstdc++'s std::ranges::__detail::__max_size_type / +// __max_diff_type). Constructing MS from an MD -- exactly what +// __to_unsigned_like does with __max_size_type(__t) -- must resolve to the +// explicit converting constructor without recursing without bound. +// +// The recursion arises because the templated constructor MS(T)/MD(T) is +// considered with T deduced as the *other class type*; that produces a bogus +// by-value constructor whose argument has to be materialised by constructing +// the same type again, ad infinitum. Per [temp.deduct.general]/5 with +// [temp.constr.decl]/1, a function-template specialisation whose associated +// constraints (here `requires std::integral`) are not satisfied by the +// deduced arguments is removed from the candidate set -- integral is +// false, so MS(T = MD) is not viable and the recursion does not occur. +#include +namespace d +{ +class MD; +class MS +{ +public: + unsigned long _M_val = 0; + MS() = default; + template + requires std::integral + constexpr MS(T i) noexcept : _M_val(i) + { + } + constexpr explicit MS(const MD &dd) noexcept; +}; +class MD +{ +public: + unsigned long _M_val = 0; + MD() = default; + template + requires std::integral + constexpr MD(T i) noexcept : _M_val(i) + { + } + constexpr explicit MD(const MS &dd) noexcept : _M_val(dd._M_val) + { + } +}; +constexpr MS::MS(const MD &dd) noexcept : _M_val(dd._M_val) +{ +} +} // namespace d +int main() +{ + d::MD md{5}; + d::MS ms(md); // MD -> MS construction (as __to_unsigned_like does) + __CPROVER_assert(ms._M_val == 5, "MD->MS construction preserves value"); + return 0; +} diff --git a/regression/cbmc-cpp/cpp20_conversion_construction_recursion/test.desc b/regression/cbmc-cpp/cpp20_conversion_construction_recursion/test.desc new file mode 100644 index 000000000000..d106fae114b5 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_conversion_construction_recursion/test.desc @@ -0,0 +1,31 @@ +KNOWNBUG +main.cpp +--cpp20 +^\[main\.assertion\.1\] line \d+ MD->MS construction preserves value: SUCCESS$ +^VERIFICATION SUCCESSFUL$ +^EXIT=0$ +^SIGNAL=0$ +-- +^CONVERSION ERROR$ +^.*is unknown.*$ +dropped the body +-- +[temp.deduct.general]/5 with [temp.constr.decl]/1: a function-template +specialisation whose associated constraints (its requires-clause) are not +satisfied by the deduced arguments is removed from the candidate set. + +Mutually-convertible class types that each have a templated integral +constructor `C(T) requires integral` and an explicit converting constructor +taking the other type (a minimal model of libstdc++'s +std::ranges::__detail::__max_size_type / __max_diff_type). Constructing MS from +an MD -- as __to_unsigned_like does via __max_size_type(__t) -- previously +recursed without bound and crashed (SIGSEGV): overload resolution considered the +templated constructor with T deduced as the *other class type* (integral is +false, but the requires-clause was not checked for a templated constructor), +producing a bogus by-value constructor whose argument had to be materialised by +constructing the same type again, ad infinitum. + +guess_function_template_args now evaluates a deduced candidate's requires-clause +(in addition to the existing parameter-level #C_concept_constraint check) and +discards the candidate when the constraint is unsatisfied, breaking the +recursion. diff --git a/regression/cbmc-cpp/cpp20_conversion_function_template_type_constraint/main.cpp b/regression/cbmc-cpp/cpp20_conversion_function_template_type_constraint/main.cpp new file mode 100644 index 000000000000..9eed17ef7867 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_conversion_function_template_type_constraint/main.cpp @@ -0,0 +1,36 @@ +extern "C" void __CPROVER_assert(bool, const char *); +template +concept integral = __is_integral(T); +struct wide +{ + unsigned long long w; + // N5008 [temp.param]/9, [temp.constr.decl]/3, [temp.deduct.general]/5: the + // type-constraint `integral' is an associated constraint of the + // conversion function template; for a class target it is not satisfied + // and the template is not a candidate (the MSVC STL's _Base128) + template + constexpr operator T() const noexcept + { + return static_cast(w); + } +}; +struct aggregate +{ + int v; +}; +int pick(aggregate) +{ + return 1; +} +int pick(...) +{ + return 2; +} +int main() +{ + wide b{7}; + long l = b; + __CPROVER_assert(l == 7 && pick(b) == 2, "only integral targets"); + __CPROVER_assert(pick(b) == 1, "WRONG (must FAIL)"); + return 0; +} diff --git a/regression/cbmc-cpp/cpp20_conversion_function_template_type_constraint/test.desc b/regression/cbmc-cpp/cpp20_conversion_function_template_type_constraint/test.desc new file mode 100644 index 000000000000..5b8bcfa94d1d --- /dev/null +++ b/regression/cbmc-cpp/cpp20_conversion_function_template_type_constraint/test.desc @@ -0,0 +1,17 @@ +KNOWNBUG +main.cpp +--cpp20 +^\[main\.assertion\.1\] line \d+ only integral targets: SUCCESS$ +^\[main\.assertion\.2\] line \d+ WRONG \(must FAIL\): FAILURE$ +^VERIFICATION FAILED$ +^EXIT=10$ +^SIGNAL=0$ +-- +^warning: ignoring +^CONVERSION ERROR$ +dropped the body +-- +The deduction of a conversion function template checked its +requires-clause only, not the type-constraints of its template +parameters; `operator T()' with T = aggregate was a candidate, its body +did not type-check and pick(aggregate) was chosen with a nondet value. diff --git a/regression/cbmc-cpp/cpp20_conversion_function_template_vs_operator_bool/main.cpp b/regression/cbmc-cpp/cpp20_conversion_function_template_vs_operator_bool/main.cpp new file mode 100644 index 000000000000..8dcbd66484a5 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_conversion_function_template_vs_operator_bool/main.cpp @@ -0,0 +1,48 @@ +#include +extern "C" void __CPROVER_assert(bool, const char *); +template +concept integral = std::is_integral_v; +template +concept is_int128 = + std::is_same_v || std::is_same_v; +struct point +{ + int x; +}; +struct big +{ + unsigned __int128 val; + template + requires integral || is_int128 + constexpr explicit operator T() const noexcept + { + return val; + } + constexpr explicit operator bool() const noexcept + { + return val != 0; + } +}; +int take_point(const point &p) +{ + return p.x; +} +int take_long(long v) +{ + return static_cast(v); +} +int main() +{ + big b{5}; + __CPROVER_assert( + static_cast(b) == 5, "explicit conversion to a satisfying type"); + __CPROVER_assert( + static_cast(b) == 5, + "explicit conversion to unsigned __int128"); + __CPROVER_assert(bool(b), "contextual conversion to bool"); + point p{7}; + // overload resolution on a call with a `point' never considers big's + // conversion function template for point (constraint unsatisfied) + __CPROVER_assert(take_point(p) == 7, "unrelated class type"); + __CPROVER_assert(static_cast(b) == 6, "WRONG (must FAIL)"); +} diff --git a/regression/cbmc-cpp/cpp20_conversion_function_template_vs_operator_bool/test.desc b/regression/cbmc-cpp/cpp20_conversion_function_template_vs_operator_bool/test.desc new file mode 100644 index 000000000000..e0c26850ac21 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_conversion_function_template_vs_operator_bool/test.desc @@ -0,0 +1,27 @@ +KNOWNBUG gnu-extensions +main.cpp +--cpp20 +^\[main\.assertion\.1\] line \d+ explicit conversion to a satisfying type: SUCCESS$ +^\[main\.assertion\.2\] line \d+ explicit conversion to unsigned __int128: SUCCESS$ +^\[main\.assertion\.3\] line \d+ contextual conversion to bool: SUCCESS$ +^\[main\.assertion\.4\] line \d+ unrelated class type: SUCCESS$ +^\[main\.assertion\.5\] line \d+ WRONG \(must FAIL\): FAILURE$ +^VERIFICATION FAILED$ +^EXIT=10$ +^SIGNAL=0$ +-- +^warning: ignoring +^CONVERSION ERROR$ +dropped the body +-- +N5008 [over.match.best.general]/2 + [temp.deduct.conv]: `static_cast(b)' on +a class with `explicit operator bool()' and a constrained `template +explicit operator T()' selects the template's `operator int()' (identity) over +operator bool plus an integral conversion; the non-template is preferred only on +a tie (/2.4). The template was tried only when no non-template conversion +function matched, so the cast produced 1 for a value of 5. [temp.constr.decl]: +the template's requires-clause (`integral || is_int128', a disjunction of +concept-ids that the type checker leaves as `or(false, false)') is folded before +it is tested, so the explicit conversion function template is not instantiated +-- and its body `return val;' not dropped -- for an unrelated class type +(libstdc++ , 315 drops over the corpus). diff --git a/regression/cbmc-cpp/cpp20_conversion_operator_instance/main.cpp b/regression/cbmc-cpp/cpp20_conversion_operator_instance/main.cpp new file mode 100644 index 000000000000..381b60b346fc --- /dev/null +++ b/regression/cbmc-cpp/cpp20_conversion_operator_instance/main.cpp @@ -0,0 +1,74 @@ +// Mutually-convertible class types that each have a templated integral +// constructor, an explicit converting constructor taking the other type, and a +// templated integral conversion operator (a minimal model of libstdc++'s +// std::ranges::__detail::__max_size_type / __max_diff_type). +// +// After constructing MS from an MD, reading the value back through the +// templated conversion operator `(int)ms` must resolve. When deducing a +// conversion (e.g. md -> int while matching a constructor candidate), the +// front end had already instantiated the source class's templated conversion +// operator `operator(signed_int)` as a class component; that instance is not +// registered in the class cpp_scope under a name-resolvable key (instantiated +// conversion operators are invoked directly, see deduce_conversion_template). +// The non-template branch of user_defined_conversion_sequence nevertheless +// iterated that component and built a *name*-driven member call, which threw +// "symbol 'operator(signed_int)' is unknown", aborting the enclosing +// statement. +// +// Per [over.match.funcs.general]/7-8 with [over.match.funcs.general]/8, such an +// instantiated template conversion function is not a viable *non-template* +// candidate; failing to form its call is a soft non-viability handled by the +// subsequent fresh template deduction, not a hard error. +#include +namespace d +{ +class MD; +class MS +{ +public: + unsigned long _M_val = 0; + MS() = default; + template + requires std::integral + constexpr MS(T i) noexcept : _M_val(i) + { + } + constexpr explicit MS(const MD &dd) noexcept; + template + requires std::integral + constexpr explicit operator T() const noexcept + { + return _M_val; + } +}; +class MD +{ +public: + unsigned long _M_val = 0; + MD() = default; + template + requires std::integral + constexpr MD(T i) noexcept : _M_val(i) + { + } + constexpr explicit MD(const MS &dd) noexcept : _M_val(dd._M_val) + { + } + template + requires std::integral + constexpr explicit operator T() const noexcept + { + return _M_val; + } +}; +constexpr MS::MS(const MD &dd) noexcept : _M_val(dd._M_val) +{ +} +} // namespace d +int main() +{ + d::MD md{5}; + d::MS ms(md); + __CPROVER_assert((int)ms == 5, "MD->MS then conversion-operator readback"); + return 0; +} diff --git a/regression/cbmc-cpp/cpp20_conversion_operator_instance/test.desc b/regression/cbmc-cpp/cpp20_conversion_operator_instance/test.desc new file mode 100644 index 000000000000..c05e0f6d4624 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_conversion_operator_instance/test.desc @@ -0,0 +1,30 @@ +KNOWNBUG +main.cpp +--cpp20 +^\[main\.assertion\.1\] line \d+ MD->MS then conversion-operator readback: SUCCESS$ +^VERIFICATION SUCCESSFUL$ +^EXIT=0$ +^SIGNAL=0$ +-- +^CONVERSION ERROR$ +^.*is unknown.*$ +dropped the body +-- +[over.match.funcs.general]/7-8 with [over.match.funcs.general]/8: an +instantiated template conversion function is not a viable *non-template* +conversion-operator candidate; failing to form its call is a soft non-viability +handled by fresh template deduction, not a hard error. + +For mutually-convertible class types each carrying a templated conversion +operator, deducing a conversion (e.g. MD -> int) instantiates the source +class's `operator(signed_int)` as a class component. That instance is not +registered in the class cpp_scope for name lookup, yet the non-template branch +of user_defined_conversion_sequence iterated it and built a name-driven member +call, which threw "symbol 'operator(signed_int)' is unknown" and aborted the +enclosing statement (silently dropping the assertion -> vacuous SUCCESS). + +The non-template branch now forms that member call inside a SFINAE context and +treats a resolution failure as a soft skip, leaving the candidate to the fresh +template-conversion deduction. Minimal model of libstdc++'s +std::ranges::__detail::__max_size_type / __max_diff_type. + diff --git a/regression/cbmc-cpp/cpp20_conversion_template_constraint/main.cpp b/regression/cbmc-cpp/cpp20_conversion_template_constraint/main.cpp new file mode 100644 index 000000000000..bd02dfc3f618 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_conversion_template_constraint/main.cpp @@ -0,0 +1,67 @@ +// [temp.deduct.general]/5 with [temp.constr.decl]/1: after argument deduction +// for a conversion-function *template* ([temp.deduct.conv]), its associated +// constraints (requires-clause) must be satisfied with the deduced arguments; +// an unsatisfied constraint is a deduction failure, so the candidate is removed +// rather than instantiated. +// +// This mirrors libstdc++'s mutually-recursive std::ranges::__detail +// __max_size_type / __max_diff_type, each with a constrained templated +// conversion operator (template requires integral<_Tp> || +// __is_int128<_Tp> operator _Tp()). Deducing that operator for a *class* +// destination (the other max-width type) must be rejected by the constraint; +// otherwise the front end instantiates a bogus "operator " and fails. +#include + +namespace d +{ +class MD; +class MS +{ +public: + unsigned long _M_val = 0; + MS() = default; + template + requires std::integral + constexpr MS(T i) noexcept : _M_val(i) + { + } + constexpr explicit MS(const MD &dd) noexcept; + template + requires std::integral + constexpr explicit operator T() const noexcept + { + return _M_val; + } +}; +class MD +{ +public: + MS _M_rep; + MD() = default; + template + requires std::integral + constexpr MD(T i) noexcept : _M_rep(i) + { + } + constexpr explicit MD(const MS &dd) noexcept : _M_rep(dd) + { + } + template + requires std::integral + constexpr explicit operator T() const noexcept + { + return static_cast(_M_rep); + } +}; +constexpr MS::MS(const MD &dd) noexcept : _M_val(dd._M_rep._M_val) +{ +} +} // namespace d + +int main() +{ + d::MD md{5}; + int x = (int)md; + __CPROVER_assert(x == 5, "constrained templated conversion operator"); + return 0; +} diff --git a/regression/cbmc-cpp/cpp20_conversion_template_constraint/test.desc b/regression/cbmc-cpp/cpp20_conversion_template_constraint/test.desc new file mode 100644 index 000000000000..91fa8d0e8a20 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_conversion_template_constraint/test.desc @@ -0,0 +1,18 @@ +KNOWNBUG +main.cpp +--cpp20 +^\[main\.assertion\.1\] line \d+ constrained templated conversion operator: SUCCESS$ +^VERIFICATION SUCCESSFUL$ +^EXIT=0$ +^SIGNAL=0$ +-- +^CONVERSION ERROR$ +^.*is unknown.*$ +dropped the body +-- +[temp.deduct.general]/5, [temp.deduct.conv], [temp.constr.decl]: a +conversion-function template whose associated constraints (requires-clause) are +not satisfied by the deduced arguments is removed from the candidate set. +Models libstdc++'s __max_size_type / __max_diff_type constrained templated +conversion operators; without the constraint check the front end instantiated a +bogus "operator " and reported it unknown. diff --git a/regression/cbmc-cpp/cpp20_conversion_template_disjunction/main.cpp b/regression/cbmc-cpp/cpp20_conversion_template_disjunction/main.cpp new file mode 100644 index 000000000000..9fedcfef8e5c --- /dev/null +++ b/regression/cbmc-cpp/cpp20_conversion_template_disjunction/main.cpp @@ -0,0 +1,66 @@ +// [temp.constr.op]: a disjunction of constraints is satisfied iff either +// operand is. A conversion-function template whose requires-clause is a +// disjunction (here integral || floating_point) must, per +// [temp.deduct.general]/5, be removed from the candidate set when the *whole* +// constraint is unsatisfied with the deduced arguments -- which for a class +// destination T means BOTH disjuncts are false. +// +// This is the shape of libstdc++'s __max_size_type / __max_diff_type templated +// conversion operators, whose constraint is integral<_Tp> || __is_int128<_Tp>. +// Deducing such an operator for the mutually-recursive class destination must +// fail, otherwise the front end instantiates a bogus "operator ". +#include + +namespace d +{ +class MD; +class MS +{ +public: + unsigned long _M_val = 0; + MS() = default; + template + requires(std::integral || std::floating_point) + constexpr MS(T i) noexcept : _M_val((unsigned long)i) + { + } + constexpr explicit MS(const MD &dd) noexcept; + template + requires(std::integral || std::floating_point) + constexpr explicit operator T() const noexcept + { + return _M_val; + } +}; +class MD +{ +public: + MS _M_rep; + MD() = default; + template + requires(std::integral || std::floating_point) + constexpr MD(T i) noexcept : _M_rep(i) + { + } + constexpr explicit MD(const MS &dd) noexcept : _M_rep(dd) + { + } + template + requires(std::integral || std::floating_point) + constexpr explicit operator T() const noexcept + { + return static_cast(_M_rep); + } +}; +constexpr MS::MS(const MD &dd) noexcept : _M_val(dd._M_rep._M_val) +{ +} +} // namespace d + +int main() +{ + d::MD md{5}; + int x = (int)md; + __CPROVER_assert(x == 5, "disjunction-constrained conversion operator"); + return 0; +} diff --git a/regression/cbmc-cpp/cpp20_conversion_template_disjunction/test.desc b/regression/cbmc-cpp/cpp20_conversion_template_disjunction/test.desc new file mode 100644 index 000000000000..b627851a815c --- /dev/null +++ b/regression/cbmc-cpp/cpp20_conversion_template_disjunction/test.desc @@ -0,0 +1,21 @@ +KNOWNBUG +main.cpp +--cpp20 +^\[main\.assertion\.1\] line \d+ disjunction-constrained conversion operator: SUCCESS$ +^VERIFICATION SUCCESSFUL$ +^EXIT=0$ +^SIGNAL=0$ +-- +^CONVERSION ERROR$ +^.*is unknown.*$ +dropped the body +-- +[temp.constr.op]/[temp.deduct.general]/5: a conversion-function template whose +requires-clause is a disjunction (integral or floating_point) is removed +from the candidate set when the whole constraint is unsatisfied with the deduced +arguments -- for a class destination both disjuncts are false. + +The constraint check now evaluates the boolean structure, so the non-viable +candidate for the mutually-recursive class destination is correctly rejected +(no spurious operator-to-class instantiation). Minimal model of libstdc++'s +__max_size_type / __max_diff_type conversion operators. diff --git a/regression/cbmc-cpp/cpp20_coroutine_co_return/main.cpp b/regression/cbmc-cpp/cpp20_coroutine_co_return/main.cpp new file mode 100644 index 000000000000..433e4327374d --- /dev/null +++ b/regression/cbmc-cpp/cpp20_coroutine_co_return/main.cpp @@ -0,0 +1,41 @@ +#if !defined(_MSC_VER) && __has_include() +// C++20 coroutine with co_return +# include +struct Task +{ + struct promise_type + { + Task get_return_object() + { + return {}; + } + std::suspend_never initial_suspend() + { + return {}; + } + std::suspend_never final_suspend() noexcept + { + return {}; + } + void return_void() + { + } + void unhandled_exception() + { + } + }; +}; +Task coro() +{ + co_return; +} +int main() +{ + coro(); +} + +#else +int main() +{ +} +#endif diff --git a/regression/cbmc-cpp/cpp20_coroutine_co_return/test.desc b/regression/cbmc-cpp/cpp20_coroutine_co_return/test.desc new file mode 100644 index 000000000000..577d7724c6a9 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_coroutine_co_return/test.desc @@ -0,0 +1,16 @@ +KNOWNBUG libstdcxx +main.cpp +--cpp20 +^\[unsupported\.1\] file main\.cpp line \d+ coroutines are not supported: coro\(\): FAILURE$ +^\*\* 1 of \d+ failed +^VERIFICATION FAILED$ +^EXIT=10$ +^SIGNAL=0$ +-- +dropped the body +-- +A coroutine with co_return, its promise type from libstdc++'s . +Coroutines are not supported: the call of coro() fails the property that +says so (see cpp20_coroutines); verification used to succeed with the +coroutine run as an ordinary function. Tagged libstdcxx: the program +falls back to an empty main where is not usable with cl. diff --git a/regression/cbmc-cpp/cpp20_coroutine_generator_semantics/main.cpp b/regression/cbmc-cpp/cpp20_coroutine_generator_semantics/main.cpp new file mode 100644 index 000000000000..e896c7ced59e --- /dev/null +++ b/regression/cbmc-cpp/cpp20_coroutine_generator_semantics/main.cpp @@ -0,0 +1,53 @@ +// N5008 [dcl.fct.def.coroutine], [expr.yield], [coroutine.handle]: count() +// is a coroutine; its first resume() runs to `co_yield 1', storing 1 in the +// promise through yield_value, the second to `co_yield 2'. See test.desc +// for what CBMC does instead. +extern "C" void __CPROVER_assert(bool, const char *); +#include +struct gen +{ + struct promise_type + { + int v = 0; + gen get_return_object() + { + return gen{std::coroutine_handle::from_promise(*this)}; + } + std::suspend_always initial_suspend() + { + return {}; + } + std::suspend_always final_suspend() noexcept + { + return {}; + } + std::suspend_always yield_value(int x) + { + v = x; + return {}; + } + void return_void() + { + } + void unhandled_exception() + { + } + }; + std::coroutine_handle h; +}; +gen count() +{ + co_yield 1; + co_yield 2; +} +int main() +{ + gen g = count(); + g.h.resume(); + int a = g.h.promise().v; + g.h.resume(); + int b = g.h.promise().v; + g.h.destroy(); + __CPROVER_assert(a == 1 && b == 2, "coroutine"); + __CPROVER_assert(false, "WRONG (must FAIL)"); +} diff --git a/regression/cbmc-cpp/cpp20_coroutine_generator_semantics/test.desc b/regression/cbmc-cpp/cpp20_coroutine_generator_semantics/test.desc new file mode 100644 index 000000000000..771b909be38d --- /dev/null +++ b/regression/cbmc-cpp/cpp20_coroutine_generator_semantics/test.desc @@ -0,0 +1,37 @@ +KNOWNBUG +main.cpp +--cpp20 --unwind 4 +^\[main\.assertion\.1\] .* coroutine: SUCCESS$ +^\[main\.assertion\.2\] .* WRONG \(must FAIL\): FAILURE$ +^VERIFICATION FAILED$ +^EXIT=10$ +^SIGNAL=0$ +-- +^warning: ignoring +^CONVERSION ERROR$ +-- +g++ 13 (-fsanitize=address,undefined) and clang++ 18 accept this program, +and it fails only its WRONG assertion. CBMC fails the first assertion: +coroutines are parsed but not implemented. The parser keeps only the +operand of `co_await e' and `co_yield e' and turns `co_return [e];' into a +skip, so count() runs as an ordinary function that evaluates 1 and 2 and +returns an unconstrained gen; resume, destroy and promise call +__builtin_coro_resume, _destroy and _promise, which have no body. None +of the promise's members (get_return_object, initial_suspend, +yield_value, final_suspend) is called. + +A fix implements N5008 [dcl.fct.def.coroutine]/5-11 (the replacement +body with the promise object, the initial and final await expressions, +the coroutine state allocated with operator new and freed on destroy), +[expr.await]/3-5 (await_ready, await_suspend, await_resume around a +suspend point), [expr.yield]/1 (co_yield e as co_await +promise.yield_value(e)), [stmt.return.coroutine] (return_value or +return_void, then the final suspend point), and the coroutine_handle +builtins ([coroutine.handle.resumption]). Suspension needs the coroutine +lowered to a state machine: a frame holding the promise, the parameters, +the locals live across a suspend point and a resume index, and a resume +function that dispatches on the index. It is KNOWNBUG, not FUTURE, as +the program is accepted and its coroutine semantics silently dropped. + +Since coroutines are reported as unsupported, the call of the coroutine +also fails the property "coroutines are not supported" and ends the path. diff --git a/regression/cbmc-cpp/cpp20_coroutine_header/main.cpp b/regression/cbmc-cpp/cpp20_coroutine_header/main.cpp new file mode 100644 index 000000000000..bd60aebf748e --- /dev/null +++ b/regression/cbmc-cpp/cpp20_coroutine_header/main.cpp @@ -0,0 +1,12 @@ +#if !defined(_MSC_VER) && __has_include() +// C++20: header parsing +# include +int main() +{ +} + +#else +int main() +{ +} +#endif diff --git a/regression/cbmc-cpp/cpp20_coroutine_header/test.desc b/regression/cbmc-cpp/cpp20_coroutine_header/test.desc new file mode 100644 index 000000000000..364d916d224e --- /dev/null +++ b/regression/cbmc-cpp/cpp20_coroutine_header/test.desc @@ -0,0 +1,9 @@ +KNOWNBUG +main.cpp +--cpp20 +^VERIFICATION SUCCESSFUL$ +^EXIT=0$ +^SIGNAL=0$ +-- +dropped the body +-- diff --git a/regression/cbmc-cpp/cpp20_coroutine_types/main.cpp b/regression/cbmc-cpp/cpp20_coroutine_types/main.cpp new file mode 100644 index 000000000000..09723de3efaa --- /dev/null +++ b/regression/cbmc-cpp/cpp20_coroutine_types/main.cpp @@ -0,0 +1,14 @@ +#if !defined(_MSC_VER) && __has_include() +// C++20 header parses +# include +int main() +{ + std::__n4861::coroutine_handle h; + __CPROVER_assert(h.address() == nullptr, "null handle"); +} + +#else +int main() +{ +} +#endif diff --git a/regression/cbmc-cpp/cpp20_coroutine_types/test.desc b/regression/cbmc-cpp/cpp20_coroutine_types/test.desc new file mode 100644 index 000000000000..b1a6f8b6eddf --- /dev/null +++ b/regression/cbmc-cpp/cpp20_coroutine_types/test.desc @@ -0,0 +1,9 @@ +KNOWNBUG gcc-only +main.cpp +--cpp20 +^VERIFICATION SUCCESSFUL$ +^EXIT=0$ +^SIGNAL=0$ +-- +dropped the body +-- diff --git a/regression/cbmc-cpp/cpp20_coroutine_types_libcxx/main.cpp b/regression/cbmc-cpp/cpp20_coroutine_types_libcxx/main.cpp new file mode 100644 index 000000000000..e87d9b4d8cf0 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_coroutine_types_libcxx/main.cpp @@ -0,0 +1,14 @@ +#if !defined(_MSC_VER) && __has_include() +// C++20 header parses +# include +int main() +{ + std::coroutine_handle h; + __CPROVER_assert(h.address() == nullptr, "null handle"); +} + +#else +int main() +{ +} +#endif diff --git a/regression/cbmc-cpp/cpp20_coroutine_types_libcxx/test.desc b/regression/cbmc-cpp/cpp20_coroutine_types_libcxx/test.desc new file mode 100644 index 000000000000..ea83d7ba8e93 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_coroutine_types_libcxx/test.desc @@ -0,0 +1,11 @@ +KNOWNBUG libcxx +main.cpp +--cpp20 --stdlib libc++ +^VERIFICATION +^EXIT=(0|10)$ +^SIGNAL=0$ +-- +^PARSING ERROR$ +-- +libc++ CONVERSION ERROR: incomplete type, missing symbol, or +implicit conversion failure. diff --git a/regression/cbmc-cpp/cpp20_coroutines/main.cpp b/regression/cbmc-cpp/cpp20_coroutines/main.cpp new file mode 100644 index 000000000000..7ec4de065955 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_coroutines/main.cpp @@ -0,0 +1,19 @@ +// C++20 coroutines — minimal test for co_return/co_await/co_yield parsing +void f() +{ + co_return; +} + +void g(int x) +{ + int y = co_await x; + co_yield y; + co_return; +} + +int main() +{ + f(); + __CPROVER_assert(1, "coroutine keywords parsed"); + return 0; +} diff --git a/regression/cbmc-cpp/cpp20_coroutines/test.desc b/regression/cbmc-cpp/cpp20_coroutines/test.desc new file mode 100644 index 000000000000..68f1be3d6bef --- /dev/null +++ b/regression/cbmc-cpp/cpp20_coroutines/test.desc @@ -0,0 +1,19 @@ +KNOWNBUG +main.cpp +--cpp20 +^\[unsupported\.1\] file main\.cpp line \d+ coroutines are not supported: f\(\): FAILURE$ +^\[unsupported\.2\] file main\.cpp line \d+ coroutines are not supported: g\(signed int\): SUCCESS$ +^file main\.cpp line \d+: C\+\+20 coroutines are not supported: calls of 'f\(\)' fail a property$ +^\*\* 1 of \d+ failed +^VERIFICATION FAILED$ +^EXIT=10$ +^SIGNAL=0$ +-- +dropped the body +-- +co_return, co_await and co_yield are parsed ([dcl.fct.def.coroutine]/1: +f and g are coroutines). Coroutines are not supported: each coroutine +gets a property that fails when it is called, and the path ends there, so +that verification does not report results for a program whose coroutines +ran as ordinary functions (cpp20_coroutine_generator_semantics). g is +not called, so its property holds. diff --git a/regression/cbmc-cpp/cpp20_crtp_auto_member_incomplete_derived/main.cpp b/regression/cbmc-cpp/cpp20_crtp_auto_member_incomplete_derived/main.cpp new file mode 100644 index 000000000000..721e83cea7e1 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_crtp_auto_member_incomplete_derived/main.cpp @@ -0,0 +1,72 @@ +// N5008 [temp.inst]/4, [temp.point]/7: a member function of a class template +// specialization is instantiated when odr-used; a body that cannot be +// converted while the CRTP-derived class is still incomplete must not be +// dropped. +extern "C" void __CPROVER_assert(bool, const char *); +#include +#include + +namespace rg +{ +struct begin_fn +{ + template + constexpr auto operator()(T &&t) const + { + if constexpr(std::is_array_v>) + return t + 0; + else + return t.begin(); + } +}; +inline constexpr begin_fn begin{}; + +template +struct view_interface +{ + constexpr Derived &derived() + { + return static_cast(*this); + } + // uses the derived class, which is incomplete while this base is + // being instantiated for it + constexpr auto front() + { + return *rg::begin(derived()); + } + constexpr bool empty() + { + return rg::begin(derived()) == nullptr; + } +}; + +template +struct ref_view : view_interface> +{ + R *p; + template + requires(!__is_same(T, ref_view)) + constexpr ref_view(T &&t) : p(&static_cast(static_cast(t))) + { + } + constexpr auto begin() const + { + return rg::begin(*p); + } +}; +template +ref_view(R &) -> ref_view; +} // namespace rg + +int main() +{ + int arr[] = {4, 5, 6}; + rg::ref_view rv{arr}; + auto b = rg::begin(rv); + static_assert(__is_same(decltype(b), int *), "begin type through ref_view"); + __CPROVER_assert(*b == 4, "begin value"); + __CPROVER_assert(rv.front() == 4, "front through the CRTP base"); + __CPROVER_assert(!rv.empty(), "empty through the CRTP base"); + __CPROVER_assert(*b == 5, "WRONG (must FAIL)"); + return 0; +} diff --git a/regression/cbmc-cpp/cpp20_crtp_auto_member_incomplete_derived/test.desc b/regression/cbmc-cpp/cpp20_crtp_auto_member_incomplete_derived/test.desc new file mode 100644 index 000000000000..d58c472bc8a5 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_crtp_auto_member_incomplete_derived/test.desc @@ -0,0 +1,23 @@ +KNOWNBUG +main.cpp +--cpp20 +^\[main\.assertion\.4\] line \d+ WRONG \(must FAIL\): FAILURE$ +^VERIFICATION FAILED$ +^EXIT=10$ +^SIGNAL=0$ +-- +^warning: ignoring +^CONVERSION ERROR$ +static_assert condition could not be evaluated +dropped the body +-- +N5008 [temp.inst]/4: view_interface> is instantiated as a +BASE of ref_view; its auto-returning members were converted eagerly +at that point, `derived().begin()` named the not-yet-complete derived class, +the conversion failed and the bodies -- including the begin_fn::operator() +instance created on the way -- were dropped for good, so `rg::begin(rv)` +returned `auto` (libstdc++ ranges: `arr | views::take(3)` had no usable +begin()). A body whose conversion fails while a class is being elaborated is +now restored and re-queued for the end-of-unit drain (converted on demand +earlier if a call needs its return type). Non-vacuous: the last assertion +states a wrong value and must FAIL. diff --git a/regression/cbmc-cpp/cpp20_ctad_aggregate_deduction_decay/main.cpp b/regression/cbmc-cpp/cpp20_ctad_aggregate_deduction_decay/main.cpp new file mode 100644 index 000000000000..192b36d52cf5 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_ctad_aggregate_deduction_decay/main.cpp @@ -0,0 +1,37 @@ +// N5008 [over.match.class.deduct]/1.10 + [temp.deduct.call]/2: the C++20 +// AGGREGATE DEDUCTION CANDIDATE deduces class template arguments from +// the aggregate's element types, with the by-value adjustments of +// [temp.deduct.call]/2 -- an array argument decays to a pointer. Here +// `take_view(arr, 3)` with `int arr[1]` must deduce take_view +// (the libc++ views::take pipe shape, cvise-reduced); the positional +// fallback previously deduced take_view and the member of +// dependent-alias type (a non-deduced context, [temp.deduct.type]/5) +// mis-took the array argument. +extern "C" void __CPROVER_assert(bool, const char *); +namespace std +{ +template +concept convertible_to = requires { _From(); }; +template +using iter_difference_t = int; +template +using range_difference_t = iter_difference_t<_Rp>; +template +struct take_view +{ + _View __base_; + range_difference_t<_View> __count_; +}; +} // namespace std +template _Np> +auto taker(_Range &&__range, _Np __n) +{ + return std::take_view(__range, __n); +} +int main() +{ + int arr[1]{7}; + auto tv = taker(arr, 3); + __CPROVER_assert(tv.__base_[0] == 7 && tv.__count_ == 3, "agg guide decay"); + return 0; +} diff --git a/regression/cbmc-cpp/cpp20_ctad_aggregate_deduction_decay/test.desc b/regression/cbmc-cpp/cpp20_ctad_aggregate_deduction_decay/test.desc new file mode 100644 index 000000000000..e385eca825e7 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_ctad_aggregate_deduction_decay/test.desc @@ -0,0 +1,11 @@ +KNOWNBUG +main.cpp +--cpp20 +^\[main\.assertion\.1\] line \d+ agg guide decay: SUCCESS$ +^VERIFICATION SUCCESSFUL$ +^EXIT=0$ +^SIGNAL=0$ +-- +dropped the body +-- +Runtime-verified with g++ and clang++. diff --git a/regression/cbmc-cpp/cpp20_ctad_aggregate_trailing_valueinit/main.cpp b/regression/cbmc-cpp/cpp20_ctad_aggregate_trailing_valueinit/main.cpp new file mode 100644 index 000000000000..ceab2fe0ba0a --- /dev/null +++ b/regression/cbmc-cpp/cpp20_ctad_aggregate_trailing_valueinit/main.cpp @@ -0,0 +1,29 @@ +// N5008 [dcl.init.aggr]/5 (via [dcl.init.general]/16.6.2.2, C++20 +// parenthesized aggregate initialization after CTAD): when the +// initializer list has FEWER entries than the aggregate has elements, +// the remaining elements are value-initialized. `take_view(3)` with a +// two-member take_view initializes __base_ from 3 and +// value-initializes __count_ to 0. Previously the single-argument +// route was gated to single-member aggregates and this shape fell into +// the explicit-cast path ("invalid explicit cast"). +extern "C" void __CPROVER_assert(bool, const char *); +template +concept convertible_to = requires { _From(); }; +template +struct take_view +{ + _View __base_; + _View __count_; +}; +template _Np> +auto taker(_Range, _Np __n) +{ + return take_view(__n); +} +int main() +{ + auto tv = taker(0, 3); + __CPROVER_assert( + tv.__base_ == 3 && tv.__count_ == 0, "aggr padding value-init"); + return 0; +} diff --git a/regression/cbmc-cpp/cpp20_ctad_aggregate_trailing_valueinit/test.desc b/regression/cbmc-cpp/cpp20_ctad_aggregate_trailing_valueinit/test.desc new file mode 100644 index 000000000000..856c1172a18e --- /dev/null +++ b/regression/cbmc-cpp/cpp20_ctad_aggregate_trailing_valueinit/test.desc @@ -0,0 +1,11 @@ +KNOWNBUG +main.cpp +--cpp20 +^\[main\.assertion\.1\] line \d+ aggr padding value-init: SUCCESS$ +^VERIFICATION SUCCESSFUL$ +^EXIT=0$ +^SIGNAL=0$ +-- +dropped the body +-- +Runtime-verified with g++ and clang++. diff --git a/regression/cbmc-cpp/cpp20_ctad_aggregate_with_defaulted_template_parameter/main.cpp b/regression/cbmc-cpp/cpp20_ctad_aggregate_with_defaulted_template_parameter/main.cpp new file mode 100644 index 000000000000..999b4693579f --- /dev/null +++ b/regression/cbmc-cpp/cpp20_ctad_aggregate_with_defaulted_template_parameter/main.cpp @@ -0,0 +1,44 @@ +extern "C" void __CPROVER_assert(bool, const char *); +template +struct view +{ + C *p; +}; +// N5008 [over.match.class.deduct]: view{s} deduces view; +// [dcl.type.auto.deduct]: so does the return type of range +auto range(const char *s) +{ + return view{s}; +} +template +struct same +{ + static constexpr bool value = false; +}; +template +struct same +{ + static constexpr bool value = true; +}; +static_assert(same>::value, ""); +struct path +{ + int n; + template + path(S s) : n(convert(range(s))) + { + } + static int convert(); + template + static int convert(const T &v) + { + return v.p[0]; + } +}; +int main() +{ + path p{"a"}; + __CPROVER_assert(p.n == 'a', "converted through the deduced type"); + __CPROVER_assert(p.n == 'b', "WRONG (must FAIL)"); + return 0; +} diff --git a/regression/cbmc-cpp/cpp20_ctad_aggregate_with_defaulted_template_parameter/test.desc b/regression/cbmc-cpp/cpp20_ctad_aggregate_with_defaulted_template_parameter/test.desc new file mode 100644 index 000000000000..2c036cf70aaa --- /dev/null +++ b/regression/cbmc-cpp/cpp20_ctad_aggregate_with_defaulted_template_parameter/test.desc @@ -0,0 +1,18 @@ +KNOWNBUG +main.cpp +--cpp20 +^\[main\.assertion\.1\] line \d+ converted through the deduced type: SUCCESS$ +^\[main\.assertion\.2\] line \d+ WRONG \(must FAIL\): FAILURE$ +^VERIFICATION FAILED$ +^EXIT=10$ +^SIGNAL=0$ +-- +^warning: ignoring +^CONVERSION ERROR$ +static assertion failed +-- +Class template argument deduction required every template parameter to be +deduced, so with an undeducible defaulted parameter it fell back to taking +the argument type as C (view). GCC 11's +std::filesystem::path(const Source &) lost its body this way +(__effective_range returns `basic_string_view{&*__source}'). diff --git a/regression/cbmc-cpp/cpp20_ctad_braced_base_element/main.cpp b/regression/cbmc-cpp/cpp20_ctad_braced_base_element/main.cpp new file mode 100644 index 000000000000..4baa275d6b90 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_ctad_braced_base_element/main.cpp @@ -0,0 +1,38 @@ +// N5008 [over.match.class.deduct]/1 + [dcl.init.aggr]/2.2: aggregate +// CTAD where the single PARENTHESIZED argument is a BRACED temporary of +// the base-element's type: `closure(takeish{n})` deduces closure +// and initializes the base element from the temporary. The paren-arg +// variant (a function-call result instead of a braced temporary) works +// (cpp17/round-48 fixes); with the braced temporary the construction +// dies HARD in the auto-return deduction path with "unexpected +// expression: struct" -- a raw struct type node reaches expression +// type-checking through the return-value CTAD hook, and the whole +// translation unit fails (rejects-valid). +// clang++ accepts and runs clean; g++ rejects the base-element +// deduction shape. +extern "C" void __CPROVER_assert(bool, const char *); +template +struct closure : F +{ +}; +struct takeish +{ + int n_; + auto operator()(int n) + { + return closure(takeish{n}); + } +}; +template +decltype(F()(A()...)) probe(F, A...); +template +struct invokable +{ + using result = decltype(probe(F(), A()...)); +}; +int main() +{ + invokable::result r = takeish{}(4); + __CPROVER_assert(r.n_ == 4, "decltype through auto-return CTAD"); + return 0; +} diff --git a/regression/cbmc-cpp/cpp20_ctad_braced_base_element/test.desc b/regression/cbmc-cpp/cpp20_ctad_braced_base_element/test.desc new file mode 100644 index 000000000000..c51fdd893693 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_ctad_braced_base_element/test.desc @@ -0,0 +1,16 @@ +KNOWNBUG +main.cpp +--cpp20 +^\[main\.assertion\.1\] line \d+ decltype through auto-return CTAD: SUCCESS$ +^VERIFICATION SUCCESSFUL$ +^EXIT=0$ +^SIGNAL=0$ +-- +dropped the body +-- +Fixed in round 51: (a) [dcl.init.aggr]/4.3 whole-base copy in +cpp_constructor's aggregate-with-bases branch; (b) CTAD argument +type-checking is idempotent (deduce skips typed args; the call +re-route wraps them already_typechecked; the base-element detection +unwraps). Kernel runtime-verified with clang++ (g++ rejects the +base-element deduction shape). diff --git a/regression/cbmc-cpp/cpp20_ctad_ctor_array_decay/main.cpp b/regression/cbmc-cpp/cpp20_ctad_ctor_array_decay/main.cpp new file mode 100644 index 000000000000..41f5ea6cd053 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_ctad_ctor_array_decay/main.cpp @@ -0,0 +1,36 @@ +// N5008 [over.match.class.deduct]/1.1 + [temp.deduct.call]/2: each +// CONSTRUCTOR of the class template yields a hypothetical deduction +// guide, and deduction against it follows function-call rules -- for +// the by-value parameter `I i`, an argument of type int(&)[1] DECAYS +// to int*. CBMC deduced wrap instead of wrap; the +// mistyped member then crashed simplify_rec downstream +// (simplify_expr.cpp postcondition: array-typed expression simplified +// to non-array). This was the ranges pipe's last blocker +// (counted_iterator(base_, count_) with base_ = int(&)[1]). +extern "C" void __CPROVER_assert(bool, const char *); +template +struct wrap +{ + wrap(I i, int) : cur_(i) + { + } + I cur_; +}; +template +struct holder +{ + V base_; + auto make() + { + return wrap(base_, 1); + } +}; +int main() +{ + int arr[1]{3}; + holder h{arr}; + auto w = h.make(); + int *p = w.cur_; + __CPROVER_assert(p[0] == 3, "ctor CTAD decays ref-array member"); + return 0; +} diff --git a/regression/cbmc-cpp/cpp20_ctad_ctor_array_decay/test.desc b/regression/cbmc-cpp/cpp20_ctad_ctor_array_decay/test.desc new file mode 100644 index 000000000000..5ea49b74c10f --- /dev/null +++ b/regression/cbmc-cpp/cpp20_ctad_ctor_array_decay/test.desc @@ -0,0 +1,12 @@ +KNOWNBUG +main.cpp +--cpp20 +^\[main\.assertion\.1\] line \d+ ctor CTAD decays ref-array member: SUCCESS$ +^VERIFICATION SUCCESSFUL$ +^EXIT=0$ +^SIGNAL=0$ +-- +dropped the body +-- +Before the fix this crashed with an invariant violation (not merely a +dropped main), so it also guards the simplify_rec postcondition. diff --git a/regression/cbmc-cpp/cpp20_ctad_for_alias_template/main.cpp b/regression/cbmc-cpp/cpp20_ctad_for_alias_template/main.cpp new file mode 100644 index 000000000000..43538d625e1f --- /dev/null +++ b/regression/cbmc-cpp/cpp20_ctad_for_alias_template/main.cpp @@ -0,0 +1,20 @@ +// N5008 [over.match.class.deduct]/3 (C++20): class template argument +// deduction for an alias template -- `Q q{3, 4}' with `template +// using Q = P' deduces T = int from the guides of P. g++ 13 +// accepts the program; clang++ implements this from version 19. +extern "C" void __CPROVER_assert(bool, const char *); +template +struct P +{ + T a; + U b; +}; +template +using Q = P; +int main() +{ + Q q{3, 4}; + __CPROVER_assert(q.a + q.b == 7, "alias template CTAD"); + __CPROVER_assert(false, "WRONG (must FAIL)"); + return 0; +} diff --git a/regression/cbmc-cpp/cpp20_ctad_for_alias_template/test.desc b/regression/cbmc-cpp/cpp20_ctad_for_alias_template/test.desc new file mode 100644 index 000000000000..c9da13c3dae2 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_ctad_for_alias_template/test.desc @@ -0,0 +1,17 @@ +KNOWNBUG +main.cpp +--cpp20 +^\[main\.assertion\.1\] .* alias template CTAD: SUCCESS$ +^\[main\.assertion\.2\] .* WRONG \(must FAIL\): FAILURE$ +^VERIFICATION FAILED$ +^EXIT=10$ +^SIGNAL=0$ +-- +^warning: ignoring +^CONVERSION ERROR$ +-- +g++ 13 (-fsanitize=address,undefined) accepts this program and it fails only +its WRONG assertion; clang++ 18 lacks alias-template CTAD (added in 19). +Fixed: "found no match for symbol 'Q'"; class template argument +deduction now handles an alias template whose defining-type-id is a +simple-template-id (deduce_alias_template_arguments). diff --git a/regression/cbmc-cpp/cpp20_ctad_for_alias_template_shapes/main.cpp b/regression/cbmc-cpp/cpp20_ctad_for_alias_template_shapes/main.cpp new file mode 100644 index 000000000000..f8a780a8a07e --- /dev/null +++ b/regression/cbmc-cpp/cpp20_ctad_for_alias_template_shapes/main.cpp @@ -0,0 +1,41 @@ +// N5008 [over.match.class.deduct]/3-4: CTAD through alias templates in a +// namespace: a pattern repeating its parameter, a constructor-derived guide, +// a functional cast. g++ 13 accepts it; clang++ 18 lacks alias CTAD. +extern "C" void __CPROVER_assert(bool, const char *); +template +struct P +{ + T a; + U b; +}; +template +struct W +{ + T v; + W(T x) : v(x) + { + } +}; +namespace lib +{ +template +using same = P; +template +using wrap = W; +} // namespace lib +template +inline constexpr bool is_same_v = false; +template +inline constexpr bool is_same_v = true; +int main() +{ + lib::same s{1, 2}; + __CPROVER_assert(is_same_v>, "repeated parameter"); + lib::wrap w(2.5); + __CPROVER_assert(is_same_v>, "constructor guide"); + auto c = lib::wrap{7L}; + __CPROVER_assert(is_same_v>, "functional cast"); + __CPROVER_assert(s.a + s.b == 3 && c.v == 7, "values"); + __CPROVER_assert(w.v == 2.0, "WRONG (must FAIL)"); + return 0; +} diff --git a/regression/cbmc-cpp/cpp20_ctad_for_alias_template_shapes/test.desc b/regression/cbmc-cpp/cpp20_ctad_for_alias_template_shapes/test.desc new file mode 100644 index 000000000000..b20c5f8e55b1 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_ctad_for_alias_template_shapes/test.desc @@ -0,0 +1,17 @@ +KNOWNBUG +main.cpp +--cpp20 +^\[main\.assertion\.1\] line \d+ repeated parameter: SUCCESS$ +^\[main\.assertion\.2\] line \d+ constructor guide: SUCCESS$ +^\[main\.assertion\.3\] line \d+ functional cast: SUCCESS$ +^\[main\.assertion\.4\] line \d+ values: SUCCESS$ +^\[main\.assertion\.5\] line \d+ WRONG \(must FAIL\): FAILURE$ +^\*\* 1 of \d+ failed +^VERIFICATION FAILED$ +^EXIT=10$ +^SIGNAL=0$ +-- +^warning: ignoring +-- +Each alias's arguments are deduced from the result of the underlying class +template's deduction ([over.match.class.deduct]/4). diff --git a/regression/cbmc-cpp/cpp20_ctad_guide_array_reference/main.cpp b/regression/cbmc-cpp/cpp20_ctad_guide_array_reference/main.cpp new file mode 100644 index 000000000000..da77aabccc59 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_ctad_guide_array_reference/main.cpp @@ -0,0 +1,47 @@ +// N5008 [temp.deduct.call]/2: array-to-pointer decay applies only when +// the function parameter is NOT a reference type. For the deduction +// guide `holder(R&&) -> holder>`, the argument `arr` (an +// lvalue of type int[3]) must deduce R = int(&)[3]; the alias then +// preserves the reference-to-array, so CTAD yields holder. +// CBMC decays the array to a pointer during class template argument +// deduction, CTAD fails ("invalid implicit conversion from 'signed int +// [3]' to 'struct holder'"), and main is silently dropped. +// This is the ranges pipe's current blocker: libc++'s +// take_view(_Range&&, ...) -> take_view> +// must produce take_view, but CBMC produces +// take_view, and downstream iterator_t has no viable +// begin() ([range.take]). +// g++ and clang++ both accept (-Werror) and run clean. +extern "C" void __CPROVER_assert(bool, const char *); +template +T __declval(int); +template +decltype(__declval(0)) declval(); +struct +{ + template + int operator()(T (&)[N]) + { + return N; + } +} arr_size; +template +using all_t = decltype(declval()); +template +struct holder +{ + V base_; + int size() + { + return arr_size(base_); + } +}; +template +holder(R &&) -> holder>; +int main() +{ + int arr[3]{1, 2, 3}; + holder h(arr); + __CPROVER_assert(h.size() == 3, "deduction guide preserves array reference"); + return 0; +} diff --git a/regression/cbmc-cpp/cpp20_ctad_guide_array_reference/test.desc b/regression/cbmc-cpp/cpp20_ctad_guide_array_reference/test.desc new file mode 100644 index 000000000000..1f6726b0934a --- /dev/null +++ b/regression/cbmc-cpp/cpp20_ctad_guide_array_reference/test.desc @@ -0,0 +1,13 @@ +KNOWNBUG +main.cpp +--cpp20 +^\[main\.assertion\.1\] line \d+ deduction guide preserves array reference: SUCCESS$ +^VERIFICATION SUCCESSFUL$ +^EXIT=0$ +^SIGNAL=0$ +-- +dropped the body +-- +N5008 [temp.deduct.call]/2-3: no decay against a reference parameter; +for a forwarding reference an lvalue argument deduces `lvalue reference +to A` -- here R = int(&)[3], preserved by the guide's alias. diff --git a/regression/cbmc-cpp/cpp20_ctad_no_forwarding_reference/main.cpp b/regression/cbmc-cpp/cpp20_ctad_no_forwarding_reference/main.cpp new file mode 100644 index 000000000000..4e63eb739135 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_ctad_no_forwarding_reference/main.cpp @@ -0,0 +1,52 @@ +// N5008 [temp.deduct.call]/3: in class template argument deduction an rvalue +// reference to a template parameter OF THE CLASS TEMPLATE is not a forwarding +// reference; [dcl.init.general]/10: value-initialising a reference is +// ill-formed (a requirement naming it is unsatisfied, not a crash). +extern "C" void __CPROVER_assert(bool, const char *); +#include +#include + +template + requires std::movable +struct owning +{ + R r = R(); + constexpr owning(R &&x) : r(std::move(x)) + { + } +}; + +template +concept can_own = requires { owning{std::declval()}; }; + +struct box +{ + int v; +}; + +template +struct wrap +{ + T t; + wrap(T &&x) : t(std::move(x)) + { + } +}; + +int main() +{ + // an array lvalue: R deduced as int[5] (not int(&)[5]); int[5] is not + // movable, so the constraint fails and the requirement is false + static_assert(!can_own, "array lvalue cannot be owned"); + static_assert(can_own, "a movable class can be owned"); + box b{4}; + owning o{std::move(b)}; + static_assert(__is_same(decltype(o), owning), "deduced box"); + __CPROVER_assert(o.r.v == 4, "moved value"); + int i = 9; + wrap w{std::move(i)}; + static_assert(__is_same(decltype(w), wrap), "T = int, not int&&"); + __CPROVER_assert(w.t == 9, "wrapped value"); + __CPROVER_assert(o.r.v == 5, "WRONG (must FAIL)"); + return 0; +} diff --git a/regression/cbmc-cpp/cpp20_ctad_no_forwarding_reference/test.desc b/regression/cbmc-cpp/cpp20_ctad_no_forwarding_reference/test.desc new file mode 100644 index 000000000000..ce7b09a557d3 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_ctad_no_forwarding_reference/test.desc @@ -0,0 +1,23 @@ +KNOWNBUG +main.cpp +--cpp20 +^\[main\.assertion\.3\] line \d+ WRONG \(must FAIL\): FAILURE$ +^VERIFICATION FAILED$ +^EXIT=10$ +^SIGNAL=0$ +-- +^warning: ignoring +^CONVERSION ERROR$ +static_assert condition could not be evaluated +Invariant check failed +dropped the body +-- +N5008 [temp.deduct.call]/3 (last sentence) + [dcl.init.general]/10: for +libstdc++'s `__can_owning_view` (`owning_view{declval<_Range>()}`) +the constructor-derived guide `owning_view(_Range&&)` deduced `_Range = +int(&)[5]` by the forwarding-reference rule, the class's `_Range _M_r = +_Range()` then value-initialised a reference and cpp_constructor aborted on +its not-a-reference invariant (the whole run dumped core). Now `_Range = +int[5]`, `movable` is false and the requirement is simply +unsatisfied; a reference value-initialisation is an ordinary error. +Non-vacuous: the last assertion states a wrong value and must FAIL. diff --git a/regression/cbmc-cpp/cpp20_ctad_paren_aggregate_single/main.cpp b/regression/cbmc-cpp/cpp20_ctad_paren_aggregate_single/main.cpp new file mode 100644 index 000000000000..ffe6d0cc8be1 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_ctad_paren_aggregate_single/main.cpp @@ -0,0 +1,31 @@ +// N5008 [over.match.class.deduct] + [dcl.init.general]/16.6.2.2: CTAD +// on an aggregate class template with a SINGLE parenthesized argument +// (`std::take_view(__n)` inside a function template, the cvise-reduced +// libc++ views::take shape). Deduction picks take_view; with no +// viable constructor and take_view an aggregate, the argument +// initializes the single member (C++20 parenthesized aggregate +// initialization). Previously the deduced single-argument call fell +// into the explicit-cast path and died with "invalid explicit cast: +// operand type: 'signed int' casting to: 'struct take_view'". +extern "C" void __CPROVER_assert(bool, const char *); +namespace std +{ +template +concept convertible_to = requires { _From(); }; +template +struct take_view +{ + _View range_difference_t; +}; +} // namespace std +template _Np> +auto taker(_Range, _Np __n) +{ + return std::take_view(__n); +} +int main() +{ + auto tv = taker(0, 3); + __CPROVER_assert(tv.range_difference_t == 3, "ctad in template"); + return 0; +} diff --git a/regression/cbmc-cpp/cpp20_ctad_paren_aggregate_single/test.desc b/regression/cbmc-cpp/cpp20_ctad_paren_aggregate_single/test.desc new file mode 100644 index 000000000000..aaaaf293465f --- /dev/null +++ b/regression/cbmc-cpp/cpp20_ctad_paren_aggregate_single/test.desc @@ -0,0 +1,12 @@ +KNOWNBUG +main.cpp +--cpp20 +^\[main\.assertion\.1\] line \d+ ctad in template: SUCCESS$ +^VERIFICATION SUCCESSFUL$ +^EXIT=0$ +^SIGNAL=0$ +-- +dropped the body +-- +Runtime-verified with g++ and clang++. 13-line cvise kernel of the +libc++ ranges views::take pipe (te4). diff --git a/regression/cbmc-cpp/cpp20_ctad_parens_aggregate/main.cpp b/regression/cbmc-cpp/cpp20_ctad_parens_aggregate/main.cpp new file mode 100644 index 000000000000..2e1d3f0e1c57 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_ctad_parens_aggregate/main.cpp @@ -0,0 +1,28 @@ +// N5008 [dcl.init.general]/16.6.2.2 (C++20): T(a1, ..., an) with T an +// aggregate and no viable constructor performs aggregate +// initialization, as the braced form does; combined with CTAD +// ([over.match.class.deduct]) this is libc++'s make_pair spelling +// `return pair(t1, t2)`. CBMC used to reject the POD case with +// "explicit typecast expects 0 or 1 operands" and silently no-body the +// enclosing template instance (fifth layer of the vector push_back +// family). +extern "C" void __CPROVER_assert(bool, const char *); + +template +struct pair +{ + A first; + B second; +}; + +template +pair make_pair(A a, B b) +{ + return pair(a, b); +} + +int main() +{ + auto p = make_pair(1, 2); + __CPROVER_assert(p.first == 1 && p.second == 2, "ctad parens"); +} diff --git a/regression/cbmc-cpp/cpp20_ctad_parens_aggregate/test.desc b/regression/cbmc-cpp/cpp20_ctad_parens_aggregate/test.desc new file mode 100644 index 000000000000..7e1f7144ee7f --- /dev/null +++ b/regression/cbmc-cpp/cpp20_ctad_parens_aggregate/test.desc @@ -0,0 +1,13 @@ +KNOWNBUG +main.cpp +--cpp20 +^\[main\.assertion\.1\] line \d+ ctad parens: SUCCESS$ +^VERIFICATION SUCCESSFUL$ +^EXIT=0$ +^SIGNAL=0$ +-- +dropped the body +-- +C++20 parenthesized aggregate initialization + CTAD +([dcl.init.general]/16.6.2.2, [over.match.class.deduct]): the +make_pair spelling `return pair(a, b)`. diff --git a/regression/cbmc-cpp/cpp20_ctor_template_not_aggregate/main.cpp b/regression/cbmc-cpp/cpp20_ctor_template_not_aggregate/main.cpp new file mode 100644 index 000000000000..bb7b72961031 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_ctor_template_not_aggregate/main.cpp @@ -0,0 +1,50 @@ +// N5008 [dcl.init.aggr]/1: a class with a user-declared constructor +// TEMPLATE is not an aggregate -- braced initialisation calls the template. +extern "C" void __CPROVER_assert(bool, const char *); + +template +struct ref +{ + R *p; + template + requires(!__is_same(T, ref)) + constexpr ref(T &&t) : p(&static_cast(static_cast(t))) + { + } + constexpr R &base() const + { + return *p; + } +}; + +template +ref(R &) -> ref; + +struct ref_int +{ + int *p; + template + ref_int(T &t) : p(&t) + { + } +}; + +int main() +{ + int arr[] = {1, 2, 3, 4, 5}; + // explicit specialization, braced + ref r1{arr}; + __CPROVER_assert(r1.base()[2] == 3, "braced, explicit args"); + // explicit specialization, parenthesised + ref r2(arr); + __CPROVER_assert(r2.base()[4] == 5, "parenthesised"); + // deduction guide, braced temporary + auto r3 = ref{arr}; + static_assert(__is_same(decltype(r3), ref), "guide"); + __CPROVER_assert(r3.base()[0] == 1, "guide value"); + int i = 7; + ref_int ri{i}; + __CPROVER_assert(*ri.p == 7, "non-template class"); + __CPROVER_assert(r1.base()[1] == 3, "WRONG (must FAIL)"); + return 0; +} diff --git a/regression/cbmc-cpp/cpp20_ctor_template_not_aggregate/test.desc b/regression/cbmc-cpp/cpp20_ctor_template_not_aggregate/test.desc new file mode 100644 index 000000000000..8375a075a6ff --- /dev/null +++ b/regression/cbmc-cpp/cpp20_ctor_template_not_aggregate/test.desc @@ -0,0 +1,19 @@ +KNOWNBUG +main.cpp +--cpp20 +^\[main\.assertion\.5\] line \d+ WRONG \(must FAIL\): FAILURE$ +^VERIFICATION FAILED$ +^EXIT=10$ +^SIGNAL=0$ +-- +^warning: ignoring +^CONVERSION ERROR$ +dropped the body +-- +N5008 [dcl.init.aggr]/1: a user-declared constructor template (not stored as a +struct component; the type carries `has_template_constructor`) makes the class +a non-aggregate, so `ref r{arr}` / `ref{arr}` call the forwarding +constructor instead of aggregate-initialising the pointer member from the +array (libstdc++ ranges::ref_view). Three call sites checked: the local +declaration path, the explicit-constructor-call path and the braced-temporary +path. Non-vacuous: the last assertion states a wrong value and must FAIL. diff --git a/regression/cbmc-cpp/cpp20_defaulted_comparison_subobjects/main.cpp b/regression/cbmc-cpp/cpp20_defaulted_comparison_subobjects/main.cpp new file mode 100644 index 000000000000..d027f5e26c92 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_defaulted_comparison_subobjects/main.cpp @@ -0,0 +1,44 @@ +// N5008 [class.spaceship]/2-4, [class.eq]/2-3, [class.compare.default]/5: +// defaulted comparisons compare the expanded list of subobjects -- bases, +// members, array elements -- and an `auto' operator<=> returns the common +// comparison type +#include +extern "C" void __CPROVER_assert(bool, const char *); +struct W +{ + int i; + double d; + auto operator<=>(const W &) const = default; +}; +struct B +{ + int b; + auto operator<=>(const B &) const = default; + bool operator==(const B &) const = default; +}; +struct D : B +{ + int arr[2]; + auto operator<=>(const D &) const = default; + bool operator==(const D &) const = default; +}; +struct N +{ + int i; + std::weak_ordering operator<=>(const N &) const = default; +}; +int main() +{ + W w1{1, 2.0}, w2{1, 3.0}; + __CPROVER_assert( + __is_same(decltype(w1 <=> w2), std::partial_ordering) && w1 < w2, + "common comparison type"); + D x{{1}, {1, 2}}, y{{1}, {1, 3}}, z{{2}, {0, 0}}; + __CPROVER_assert(x < y && x < z && !(z < x), "base, then array elements"); + __CPROVER_assert(x == x && !(x == y) && !(x == z), "defaulted =="); + N n{1}, o{2}; + __CPROVER_assert( + __is_same(decltype(n <=> o), std::weak_ordering) && n < o, + "declared return type"); + __CPROVER_assert(x == y, "WRONG (must FAIL)"); +} diff --git a/regression/cbmc-cpp/cpp20_defaulted_comparison_subobjects/test.desc b/regression/cbmc-cpp/cpp20_defaulted_comparison_subobjects/test.desc new file mode 100644 index 000000000000..6457042b4309 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_defaulted_comparison_subobjects/test.desc @@ -0,0 +1,25 @@ +KNOWNBUG +main.cpp +--cpp20 +^\[main\.assertion\.1\] line \d+ common comparison type: SUCCESS$ +^\[main\.assertion\.2\] line \d+ base, then array elements: SUCCESS$ +^\[main\.assertion\.3\] line \d+ defaulted ==: SUCCESS$ +^\[main\.assertion\.4\] line \d+ declared return type: SUCCESS$ +^\[main\.assertion\.5\] line \d+ WRONG \(must FAIL\): FAILURE$ +^VERIFICATION FAILED$ +^EXIT=10$ +^SIGNAL=0$ +-- +^warning: ignoring +^CONVERSION ERROR$ +-- +N5008 [class.spaceship]/2-4, [class.eq]/2-3, [class.compare.default]/5: +defaulted operator<=> and operator== compare the expanded list of +subobjects -- direct bases, then members, arrays element by element -- +and an `auto' operator<=> returns the common comparison type of the +element comparisons (partial_ordering with a double member). The front +end typed every defaulted <=> as int and compared only the members, an +array as a pointer (bin53). defaulted_three_way_comparison builds the +body from xi <=> yi converted to R, and defaulted == uses the same +expanded list. g++ 13 and clang++ 18 accept this program, and it fails +only its WRONG assertion. diff --git a/regression/cbmc-cpp/cpp20_defaulted_equality/main.cpp b/regression/cbmc-cpp/cpp20_defaulted_equality/main.cpp new file mode 100644 index 000000000000..d70463af7056 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_defaulted_equality/main.cpp @@ -0,0 +1,20 @@ +// C++20 defaulted comparison operators +struct Point +{ + int x; + int y; + bool operator==(const Point &) const = default; + bool operator!=(const Point &) const = default; +}; + +int main() +{ + Point a = {1, 2}; + Point b = {1, 2}; + Point c = {3, 4}; + __CPROVER_assert(a == b, "equal points"); + __CPROVER_assert(!(a == c), "unequal points"); + __CPROVER_assert(a != c, "not-equal operator"); + __CPROVER_assert(!(a != b), "not not-equal"); + return 0; +} diff --git a/regression/cbmc-cpp/cpp20_defaulted_equality/test.desc b/regression/cbmc-cpp/cpp20_defaulted_equality/test.desc new file mode 100644 index 000000000000..9242e8aebdf2 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_defaulted_equality/test.desc @@ -0,0 +1,10 @@ +KNOWNBUG +main.cpp +--cpp20 +^VERIFICATION SUCCESSFUL$ +^EXIT=0$ +^SIGNAL=0$ +-- +dropped the body +-- +C++20 defaulted operator== and operator!= diff --git a/regression/cbmc-cpp/cpp20_defaulted_friend_eq/main.cpp b/regression/cbmc-cpp/cpp20_defaulted_friend_eq/main.cpp new file mode 100644 index 000000000000..dd741e72ece3 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_defaulted_friend_eq/main.cpp @@ -0,0 +1,24 @@ +struct S +{ + int x; + int y; + friend bool operator==(S, S) = default; +}; + +bool is_eq(S a, S b) +{ + return a == b; +} + +bool is_neq(S a, S b) +{ + return a != b; +} + +int main() +{ + S a{1, 2}, b{1, 2}, c{1, 3}; + __CPROVER_assert(is_eq(a, b), "equal"); + __CPROVER_assert(is_neq(a, c), "not equal"); + __CPROVER_assert(!is_neq(a, b), "not not-equal"); +} diff --git a/regression/cbmc-cpp/cpp20_defaulted_friend_eq/test.desc b/regression/cbmc-cpp/cpp20_defaulted_friend_eq/test.desc new file mode 100644 index 000000000000..02e2195a9475 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_defaulted_friend_eq/test.desc @@ -0,0 +1,10 @@ +KNOWNBUG +main.cpp +--cpp20 +^VERIFICATION SUCCESSFUL$ +^EXIT=0$ +^SIGNAL=0$ +-- +dropped the body +-- +Defaulted friend operator== and C++20 synthesized operator!= diff --git a/regression/cbmc-cpp/cpp20_defaulted_friend_equality/main.cpp b/regression/cbmc-cpp/cpp20_defaulted_friend_equality/main.cpp new file mode 100644 index 000000000000..7f37b100bbe3 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_defaulted_friend_equality/main.cpp @@ -0,0 +1,46 @@ +extern "C" void __CPROVER_assert(bool, const char *); +enum class errc +{ + ok = 0, + bad = 1 +}; +struct to_chars_result +{ + char *ptr; + errc ec; + friend bool + operator==(const to_chars_result &, const to_chars_result &) = default; +}; +struct point +{ + int x, y; + bool operator==(const point &) const = default; +}; +// the member form over a padded layout (8-byte pointer, 4-byte int) +struct padded +{ + const char *name; + int n; + bool operator==(const padded &) const = default; +}; +struct ordered +{ + long key; + int tag; + friend bool operator==(const ordered &, const ordered &) = default; + friend bool operator!=(const ordered &, const ordered &) = default; +}; +int main() +{ + char buf[4]; + to_chars_result a{buf, errc::ok}, b{buf, errc::ok}, c{buf + 1, errc::bad}; + __CPROVER_assert(a == b, "defaulted friend operator== compares the members"); + __CPROVER_assert(a != c, "and != is rewritten from it"); + point p{1, 2}, q{1, 3}; + __CPROVER_assert(p != q && p == p, "defaulted member operator=="); + padded r{"a", 1}, s{"a", 1}, t{"a", 2}; + __CPROVER_assert(r == s && !(r == t), "defaulted member == over padding"); + ordered u{5, 1}, v{5, 1}, w{5, 2}; + __CPROVER_assert(u == v && u != w, "defaulted friend == and != over padding"); + __CPROVER_assert(p == q, "WRONG (must FAIL)"); +} diff --git a/regression/cbmc-cpp/cpp20_defaulted_friend_equality/test.desc b/regression/cbmc-cpp/cpp20_defaulted_friend_equality/test.desc new file mode 100644 index 000000000000..84f429855323 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_defaulted_friend_equality/test.desc @@ -0,0 +1,32 @@ +KNOWNBUG +main.cpp +--cpp20 +^\[main\.assertion\.1\] line \d+ defaulted friend operator== compares the members: SUCCESS$ +^\[main\.assertion\.2\] line \d+ and != is rewritten from it: SUCCESS$ +^\[main\.assertion\.3\] line \d+ defaulted member operator==: SUCCESS$ +^\[main\.assertion\.4\] line \d+ defaulted member == over padding: SUCCESS$ +^\[main\.assertion\.5\] line \d+ defaulted friend == and != over padding: SUCCESS$ +^\[main\.assertion\.6\] line \d+ WRONG \(must FAIL\): FAILURE$ +^VERIFICATION FAILED$ +^EXIT=10$ +^SIGNAL=0$ +-- +^warning: ignoring +^CONVERSION ERROR$ +is unknown$ +dropped the body +-- +N5008 [class.compare.default]/1: a defaulted comparison operator may be a +FRIEND of the class taking two `const C &' parameters; it is defined as the +memberwise comparison ([class.eq]/3) exactly like the defaulted member form +`bool operator==(const C &) const = default'. The friend form failed with +"symbol '' is unknown" at the declaration and the translation unit was +rejected. Round-163 diagnosis: not the friend form -- the synthesized +memberwise comparison ([class.compare.default]/5: base classes and +non-static data MEMBERS) also compared the anonymous padding component the +layout inserts between `char *ptr' and `errc ec'; the member form failed +the same way for any padded class (the original `point' has none). Fixed +in round 163 (padding skipped for defaulted ==, != and <=>). This is libc++'s std::to_chars_result +(`friend bool operator==(const to_chars_result &, const to_chars_result &) = +default'), whose operator== body is dropped in every libc++ C++20 test +(audit residue item 3, round 162). diff --git a/regression/cbmc-cpp/cpp20_defaulted_spaceship/main.cpp b/regression/cbmc-cpp/cpp20_defaulted_spaceship/main.cpp new file mode 100644 index 000000000000..c9c18e7d5658 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_defaulted_spaceship/main.cpp @@ -0,0 +1,15 @@ +// C++20 defaulted three-way comparison operator +struct Point +{ + int x; + int y; + auto operator<=>(const Point &) const = default; +}; + +int main() +{ + Point a{1, 2}; + Point b{1, 3}; + __CPROVER_assert((a <=> b) < 0, "defaulted spaceship"); + return 0; +} diff --git a/regression/cbmc-cpp/cpp20_defaulted_spaceship/test.desc b/regression/cbmc-cpp/cpp20_defaulted_spaceship/test.desc new file mode 100644 index 000000000000..729bef403a23 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_defaulted_spaceship/test.desc @@ -0,0 +1,10 @@ +KNOWNBUG +main.cpp +--cpp20 +^VERIFICATION SUCCESSFUL$ +^EXIT=0$ +^SIGNAL=0$ +-- +dropped the body +-- +C++20 defaulted three-way comparison operator diff --git a/regression/cbmc-cpp/cpp20_defaulted_spaceship_declares_equality/main.cpp b/regression/cbmc-cpp/cpp20_defaulted_spaceship_declares_equality/main.cpp new file mode 100644 index 000000000000..ca8ed2f81104 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_defaulted_spaceship_declares_equality/main.cpp @@ -0,0 +1,42 @@ +// N5008 [class.compare.default]/4: a class that declares no operator== +// gets one for each defaulted operator<=>, with its parameters and the +// return type bool, defined as defaulted ([class.eq]/3: memberwise ==). A +// declared operator== (here a user-provided one in R) suppresses it. +#include +extern "C" void __CPROVER_assert(bool, const char *); +struct P +{ + int x, y; + auto operator<=>(const P &) const = default; +}; +struct F +{ + int v; + friend auto operator<=>(const F &, const F &) = default; +}; +struct R +{ + int v; + auto operator<=>(const R &) const = default; + bool operator==(const R &o) const + { + return v % 10 == o.v % 10; + } +}; +struct D : P +{ + int z; + auto operator<=>(const D &) const = default; +}; +int main() +{ + P a{1, 2}, b{1, 2}, c{1, 3}; + F f{4}, g{5}; + R r{3}, s{13}; + D d{{1, 2}, 3}, e{{1, 2}, 4}; + __CPROVER_assert( + a == b && a != c && !(f == g) && f != g && r == s && d != e && d == d, + "== and != from the defaulted <=>"); + __CPROVER_assert(a == c, "WRONG (must FAIL)"); + return 0; +} diff --git a/regression/cbmc-cpp/cpp20_defaulted_spaceship_declares_equality/test.desc b/regression/cbmc-cpp/cpp20_defaulted_spaceship_declares_equality/test.desc new file mode 100644 index 000000000000..071970257d49 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_defaulted_spaceship_declares_equality/test.desc @@ -0,0 +1,17 @@ +KNOWNBUG libstdcxx +main.cpp +--cpp20 +^\[main\.assertion\.1\] line \d+ == and != from the defaulted <=>: SUCCESS$ +^\[main\.assertion\.2\] line \d+ WRONG \(must FAIL\): FAILURE$ +^\*\* 1 of \d+ failed +^VERIFICATION FAILED$ +^EXIT=10$ +^SIGNAL=0$ +-- +^warning: ignoring +^CONVERSION ERROR$ +-- +CBMC did not declare the implicit operator== of a class with a defaulted +operator<=> ([class.compare.default]/4): `a == b' was rejected with "no +comparison operator for an operand of class type", as `a != c' (which +[over.match.oper]/3.4 rewrites to !(a == c)). diff --git a/regression/cbmc-cpp/cpp20_defaulted_spaceship_declares_equality/test_libcxx.desc b/regression/cbmc-cpp/cpp20_defaulted_spaceship_declares_equality/test_libcxx.desc new file mode 100644 index 000000000000..259bdf330177 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_defaulted_spaceship_declares_equality/test_libcxx.desc @@ -0,0 +1,14 @@ +KNOWNBUG libcxx +main.cpp +--cpp20 --stdlib libc++ +^\[main\.assertion\.1\] line \d+ == and != from the defaulted <=>: SUCCESS$ +^\[main\.assertion\.2\] line \d+ WRONG \(must FAIL\): FAILURE$ +^\*\* 1 of \d+ failed +^VERIFICATION FAILED$ +^EXIT=10$ +^SIGNAL=0$ +-- +^warning: ignoring +^CONVERSION ERROR$ +-- +The same with libc++'s . diff --git a/regression/cbmc-cpp/cpp20_deleted_member_of_namespace_class_in_requirement/main.cpp b/regression/cbmc-cpp/cpp20_deleted_member_of_namespace_class_in_requirement/main.cpp new file mode 100644 index 000000000000..15d2f2eb12e1 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_deleted_member_of_namespace_class_in_requirement/main.cpp @@ -0,0 +1,63 @@ +extern "C" void __CPROVER_assert(bool, const char *); +// N5008 [dcl.fct.def.delete]/2, [expr.prim.req.general]/5: the deleted +// fallback `operator()(auto &&) = delete' of a customization point object +// in a namespace is selected for E, and its use makes the requirement +// unsatisfied (libc++'s ranges::begin, behind ranges::range and so +// `arr | views::take(3)') +namespace rg +{ +namespace b_ +{ +template +concept member_begin = requires(T &&t) { t.begin(); }; +void begin() = delete; +template +concept unq_begin = !member_begin && requires(T &&t) { begin(t); }; +struct fn +{ + template + constexpr auto operator()(T (&t)[N]) const noexcept + requires(sizeof(T) >= 0) + { + return t + 0; + } + template + requires member_begin + constexpr auto operator()(T &&t) const + { + return t.begin(); + } + template + requires unq_begin + constexpr auto operator()(T &&t) const + { + return begin(t); + } + void operator()(auto &&) const = delete; +}; +} // namespace b_ +inline namespace cpo +{ +inline constexpr auto begin = b_::fn{}; +} +} // namespace rg +template +concept has_begin = requires(T &t) { rg::begin(t); }; +struct R +{ + int *begin() + { + return nullptr; + } +}; +struct E +{ +}; +int main() +{ + int a[2]; + __CPROVER_assert(has_begin && has_begin, "ranges"); + __CPROVER_assert(!has_begin, "deleted fallback"); + __CPROVER_assert(rg::begin(a) == a, "array"); + __CPROVER_assert(has_begin, "WRONG (must FAIL)"); +} diff --git a/regression/cbmc-cpp/cpp20_deleted_member_of_namespace_class_in_requirement/test.desc b/regression/cbmc-cpp/cpp20_deleted_member_of_namespace_class_in_requirement/test.desc new file mode 100644 index 000000000000..cfa10aad9bac --- /dev/null +++ b/regression/cbmc-cpp/cpp20_deleted_member_of_namespace_class_in_requirement/test.desc @@ -0,0 +1,18 @@ +KNOWNBUG +main.cpp +--cpp20 +^\[main\.assertion\.1\] line \d+ ranges: SUCCESS$ +^\[main\.assertion\.2\] line \d+ deleted fallback: SUCCESS$ +^\[main\.assertion\.3\] line \d+ array: SUCCESS$ +^\[main\.assertion\.4\] line \d+ WRONG \(must FAIL\): FAILURE$ +^VERIFICATION FAILED$ +^EXIT=10$ +^SIGNAL=0$ +-- +^warning: ignoring +^CONVERSION ERROR$ +-- +The access check of a resolved member looked its class up as `tag-ns::C' +instead of `ns::tag-C', found nothing and let the call pass; a deleted +member of a class in a namespace was callable, so ranges::range held for +every class type. diff --git a/regression/cbmc-cpp/cpp20_designated_braced_return/main.cpp b/regression/cbmc-cpp/cpp20_designated_braced_return/main.cpp new file mode 100644 index 000000000000..4abe2b674a1f --- /dev/null +++ b/regression/cbmc-cpp/cpp20_designated_braced_return/main.cpp @@ -0,0 +1,64 @@ +// User-reported Issues 9 and 10. N5008 [stmt.return]/2 + [dcl.init.list]: a +// braced return copy-list-initializes the result object; with a +// designated-initializer-list ([dcl.init.aggr]/3) or an empty list for a union +// ([dcl.init.list]/3.4, [dcl.init.aggr]/5.5, value-initialization) the +// conversion went to the positional member-wise path, which knew neither +// ("invalid implicit conversion from '<>'"). +extern "C" void __CPROVER_assert(bool, const char *); +typedef unsigned long uint64_t; +struct In +{ + int x; + int y; +}; +struct S +{ + uint64_t a; + int b; + bool v; + In in; + int arr[2]; + int get() const + { + return b; + } +}; +union U +{ + int i; + float f; +}; +S make(unsigned i) +{ + return {.a = i, .b = 2, .v = true}; +} +S make3(unsigned i) +{ + return {.a = i, .in = {.y = 9}, .arr = {1, 2}}; +} +U make_u(bool ok) +{ + if(!ok) + return {}; + return {.f = 1.5f}; +} +int take(S s) +{ + return s.b; +} +int main() +{ + S s = make(5); + __CPROVER_assert( + s.a == 5 && s.b == 2 && s.v && s.in.x == 0 && s.arr[1] == 0, + "designated braced return, rest value-initialised"); + S t = make3(6); + __CPROVER_assert( + t.a == 6 && t.b == 0 && !t.v && t.in.y == 9 && t.arr[1] == 2 && + t.get() == 0, + "nested designators"); + __CPROVER_assert(make_u(false).i == 0, "return {} with a union return type"); + __CPROVER_assert(make_u(true).f == 1.5f, "union designated return"); + __CPROVER_assert(take({.b = 7}) == 7, "designated argument"); + return 0; +} diff --git a/regression/cbmc-cpp/cpp20_designated_braced_return/test.desc b/regression/cbmc-cpp/cpp20_designated_braced_return/test.desc new file mode 100644 index 000000000000..dea6ddf1c315 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_designated_braced_return/test.desc @@ -0,0 +1,14 @@ +KNOWNBUG +main.cpp +--cpp20 +^EXIT=0$ +^SIGNAL=0$ +^VERIFICATION SUCCESSFUL$ +-- +^warning: ignoring +^CONVERSION ERROR$ +dropped the body +-- +User-reported Issues 9/10: designated initializers in a braced return and +`return {}' for a union return type go through do_initializer +([dcl.init.aggr]/3, [dcl.init.aggr]/5.5). diff --git a/regression/cbmc-cpp/cpp20_designated_init/main.cpp b/regression/cbmc-cpp/cpp20_designated_init/main.cpp new file mode 100644 index 000000000000..80ba370cecfc --- /dev/null +++ b/regression/cbmc-cpp/cpp20_designated_init/main.cpp @@ -0,0 +1,15 @@ +// C++20 designated initializers +struct Point +{ + int x; + int y; + int z; +}; + +int main() +{ + Point p = {.x = 1, .z = 3}; + __CPROVER_assert(p.x == 1, "x"); + __CPROVER_assert(p.y == 0, "y"); + __CPROVER_assert(p.z == 3, "z"); +} diff --git a/regression/cbmc-cpp/cpp20_designated_init/test.desc b/regression/cbmc-cpp/cpp20_designated_init/test.desc new file mode 100644 index 000000000000..364d916d224e --- /dev/null +++ b/regression/cbmc-cpp/cpp20_designated_init/test.desc @@ -0,0 +1,9 @@ +KNOWNBUG +main.cpp +--cpp20 +^VERIFICATION SUCCESSFUL$ +^EXIT=0$ +^SIGNAL=0$ +-- +dropped the body +-- diff --git a/regression/cbmc-cpp/cpp20_designated_init_default_member_initializer/main.cpp b/regression/cbmc-cpp/cpp20_designated_init_default_member_initializer/main.cpp new file mode 100644 index 000000000000..01261f7b9f93 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_designated_init_default_member_initializer/main.cpp @@ -0,0 +1,67 @@ +// N5008 [dcl.init.aggr]/3.1, /5.1: in a designated-initializer-list the +// explicitly initialized elements are the members the designators NAME; every +// other element is initialized from its default member initializer. The +// front end filled default member initializers by COUNT ("the first N members +// were given"), so `{.c = 7}` on `struct {int a=1; int b=2; int c=3;}` left +// a=0 and dropped 7 -- wrong verdicts. A braced default member initializer +// of a bit-field (`uint16_t b : 1 {false}`, libc++'s __format::__fields) +// reached the model as a raw initializer_list cast to the bit-field, which +// aborted the bit-vector flattener ("Reached unimplemented +// boolbv_widtht::get_entry()") -- the shape of `inline constexpr __fields +// __fields_bool{.__type_ = true}` behind every libc++ / test. +extern "C" void __CPROVER_assert(bool, const char *); + +struct G +{ + int a = 1; + int b = 2; + int c = 3; +}; + +struct H +{ + int a; + int b; + int c; +}; + +struct F +{ + unsigned short a : 1 {false}; + unsigned short b : 1 {false}; + unsigned short c : 3 {false}; + unsigned short d : 2 {false}; +}; + +inline constexpr F gb{.b = true, .d = true}; +constexpr F gz{}; +constexpr G gg{.c = 9}; + +static_assert(gb.a == 0 && gb.b == 1 && gb.c == 0 && gb.d == 1, "ns bits"); +static_assert(gz.b == 0 && gz.d == 0, "ns empty list"); +static_assert(gg.a == 1 && gg.b == 2 && gg.c == 9, "ns designated"); + +int main() +{ + G g1{.a = 7}; + __CPROVER_assert(g1.a == 7 && g1.b == 2 && g1.c == 3, "first designated"); + G g2{.c = 7}; + __CPROVER_assert(g2.a == 1 && g2.b == 2 && g2.c == 7, "last designated"); + G g3{.a = 8, .c = 9}; + __CPROVER_assert(g3.a == 8 && g3.b == 2 && g3.c == 9, "two designated"); + G g4{5}; + __CPROVER_assert(g4.a == 5 && g4.b == 2 && g4.c == 3, "positional"); + H h{.b = 4}; + __CPROVER_assert(h.a == 0 && h.b == 4 && h.c == 0, "no default member init"); + + F f{.c = true}; + __CPROVER_assert(f.a == 0 && f.b == 0 && f.c == 1 && f.d == 0, "bit-fields"); + F p{true}; + __CPROVER_assert(p.a == 1 && p.c == 0, "bit-fields positional"); + __CPROVER_assert(gb.b == 1 && gb.c == 0 && gb.d == 1, "ns bits at run time"); + + constexpr F k; + static_assert(k.a == 0 && k.c == 0, "block-scope constexpr bit-fields"); + + __CPROVER_assert(g2.a == 0, "WRONG (must FAIL)"); +} diff --git a/regression/cbmc-cpp/cpp20_designated_init_default_member_initializer/test.desc b/regression/cbmc-cpp/cpp20_designated_init_default_member_initializer/test.desc new file mode 100644 index 000000000000..71b4b7e8aab2 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_designated_init_default_member_initializer/test.desc @@ -0,0 +1,29 @@ +KNOWNBUG +main.cpp +--cpp20 +^EXIT=10$ +^SIGNAL=0$ +^\[main\.assertion\.1\] line \d+ first designated: SUCCESS$ +^\[main\.assertion\.2\] line \d+ last designated: SUCCESS$ +^\[main\.assertion\.3\] line \d+ two designated: SUCCESS$ +^\[main\.assertion\.4\] line \d+ positional: SUCCESS$ +^\[main\.assertion\.5\] line \d+ no default member init: SUCCESS$ +^\[main\.assertion\.6\] line \d+ bit-fields: SUCCESS$ +^\[main\.assertion\.7\] line \d+ bit-fields positional: SUCCESS$ +^\[main\.assertion\.8\] line \d+ ns bits at run time: SUCCESS$ +^\[main\.assertion\.9\] line \d+ WRONG \(must FAIL\): FAILURE$ +^VERIFICATION FAILED$ +-- +static_assert condition could not be evaluated +static assertion failed +ignoring initializer_list +Invariant check failed +^warning: ignoring +dropped the body +-- +N5008 [dcl.init.aggr]/3.1 (designators name the explicitly initialized +elements) and /5.1 (the others take their default member initializer), plus +[class.bit] braced default member initializers of bit-fields. Non-vacuous: +the last assertion is deliberately wrong and must FAIL. Before the fix: +"last designated"/"two designated" FAILURE (a=0, 7 dropped), and the bit-field +cases aborted the solver ("Reached unimplemented boolbv_widtht::get_entry()"). diff --git a/regression/cbmc-cpp/cpp20_designated_init_verify/main.cpp b/regression/cbmc-cpp/cpp20_designated_init_verify/main.cpp new file mode 100644 index 000000000000..6b0274febf24 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_designated_init_verify/main.cpp @@ -0,0 +1,18 @@ +// C++20 designated initializers +struct S +{ + int a; + int b; + int c; +}; +int main() +{ + S s1{.a = 1, .b = 2, .c = 3}; + __CPROVER_assert(s1.a == 1, "designated a"); + __CPROVER_assert(s1.c == 3, "designated c"); + + S s2{.a = 10, .c = 30}; + __CPROVER_assert(s2.a == 10, "skip b: a"); + __CPROVER_assert(s2.c == 30, "skip b: c"); + return 0; +} diff --git a/regression/cbmc-cpp/cpp20_designated_init_verify/test.desc b/regression/cbmc-cpp/cpp20_designated_init_verify/test.desc new file mode 100644 index 000000000000..990adb963a6c --- /dev/null +++ b/regression/cbmc-cpp/cpp20_designated_init_verify/test.desc @@ -0,0 +1,10 @@ +KNOWNBUG +main.cpp +--cpp20 +^VERIFICATION SUCCESSFUL$ +^EXIT=0$ +^SIGNAL=0$ +-- +dropped the body +-- +C++20 designated initializers diff --git a/regression/cbmc-cpp/cpp20_designated_initializer_of_base_element/main.cpp b/regression/cbmc-cpp/cpp20_designated_initializer_of_base_element/main.cpp new file mode 100644 index 000000000000..ef015faa36cd --- /dev/null +++ b/regression/cbmc-cpp/cpp20_designated_initializer_of_base_element/main.cpp @@ -0,0 +1,23 @@ +// N5008 [dcl.init.aggr]/3.1, /5: a designated-initializer-list for a base +// element initializes the named members; the others from their default +// member initializers or by value-initialization +extern "C" void __CPROVER_assert(bool, const char *); +struct A +{ + int a; + int b = 7; + int c; +}; +struct D : A +{ + int d; +}; +int main() +{ + D d{{.a = 2}, 4}; + __CPROVER_assert( + d.a == 2 && d.b == 7 && d.c == 0 && d.d == 4, "designated base element"); + D e{{.a = 1, .c = 3}, 5}; + __CPROVER_assert(e.a == 1 && e.b == 7 && e.c == 3, "two designators"); + __CPROVER_assert(d.c == 3, "WRONG (must FAIL)"); +} diff --git a/regression/cbmc-cpp/cpp20_designated_initializer_of_base_element/test.desc b/regression/cbmc-cpp/cpp20_designated_initializer_of_base_element/test.desc new file mode 100644 index 000000000000..00b1133c99cf --- /dev/null +++ b/regression/cbmc-cpp/cpp20_designated_initializer_of_base_element/test.desc @@ -0,0 +1,20 @@ +KNOWNBUG +main.cpp +--cpp20 +^\[main\.assertion\.1\] line \d+ designated base element: SUCCESS$ +^\[main\.assertion\.2\] line \d+ two designators: SUCCESS$ +^\[main\.assertion\.3\] line \d+ WRONG \(must FAIL\): FAILURE$ +^VERIFICATION FAILED$ +^EXIT=10$ +^SIGNAL=0$ +-- +^warning: ignoring +^CONVERSION ERROR$ +-- +N5008 [dcl.init.aggr]/3.1, /5: in `D d{{.a = 2}, 4}' the base element A +is initialized from a designated-initializer-list: a from 2, b from its +default member initializer, c value-initialized. The aggregate-with-base +path assigned the designated initializers positionally (bin53: an +invariant violation in symex). They are now matched to the members by +name. g++ 13 and clang++ 18 accept this program, and it fails only its +WRONG assertion. diff --git a/regression/cbmc-cpp/cpp20_designated_initializer_of_class_type_member/main.cpp b/regression/cbmc-cpp/cpp20_designated_initializer_of_class_type_member/main.cpp new file mode 100644 index 000000000000..fa340610b2c5 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_designated_initializer_of_class_type_member/main.cpp @@ -0,0 +1,29 @@ +// N5008 [dcl.init.aggr]/3.1, /4.2: a designated-initializer-list +// initializes the named elements, an element of class type by its +// constructor (libstdc++ 16's `constexpr leap_second_info +// __after_last{.is_leap_second = false, .elapsed = seconds(...)}'). +extern "C" void __CPROVER_assert(bool, const char *); +struct sec +{ + long n; + constexpr explicit sec(long x) : n(x) + { + } +}; +struct info +{ + bool b; + sec e; + int tail = 7; +}; +int f(int k) +{ + constexpr info after_last{.b = false, .e = sec(3)}; + info later{.e = sec(k)}; + return (int)after_last.e.n + (int)later.e.n + later.tail + later.b; +} +int main() +{ + __CPROVER_assert(f(1) == 11, "designated class member"); + __CPROVER_assert(f(1) == 4, "WRONG (must FAIL)"); +} diff --git a/regression/cbmc-cpp/cpp20_designated_initializer_of_class_type_member/test.desc b/regression/cbmc-cpp/cpp20_designated_initializer_of_class_type_member/test.desc new file mode 100644 index 000000000000..71a03e7628b7 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_designated_initializer_of_class_type_member/test.desc @@ -0,0 +1,19 @@ +KNOWNBUG +main.cpp +--cpp20 +^\[main\.assertion\.1\] line \d+ designated class member: SUCCESS$ +^\[main\.assertion\.2\] line \d+ WRONG \(must FAIL\): FAILURE$ +^\*\* 1 of \d+ failed +^VERIFICATION FAILED$ +^EXIT=10$ +^SIGNAL=0$ +-- +^warning: ignoring +^CONVERSION ERROR$ +-- +aggregate_member_initialization paired the initializer-clauses with the +members by position, so `.e = sec(3)' (a designated-initializer node) +became the argument of sec's constructor ("found no match for symbol +'sec'"). The designators now select the members; the others take their +default member initializer or are value-initialized. This made libstdc++ +16.2.0's lose __get_leap_second_info. diff --git a/regression/cbmc-cpp/cpp20_erase_if/main.cpp b/regression/cbmc-cpp/cpp20_erase_if/main.cpp new file mode 100644 index 000000000000..37b041dca9c8 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_erase_if/main.cpp @@ -0,0 +1,13 @@ +// C++20 std::erase_if +#include +int main() +{ + std::vector v; + v.push_back(1); + v.push_back(2); + v.push_back(3); + v.push_back(4); + v.push_back(5); + std::erase_if(v, [](int x) { return x % 2 == 0; }); + __CPROVER_assert(v.size() == 3, "erase_if"); +} diff --git a/regression/cbmc-cpp/cpp20_erase_if/test.desc b/regression/cbmc-cpp/cpp20_erase_if/test.desc new file mode 100644 index 000000000000..d67fdd4bad81 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_erase_if/test.desc @@ -0,0 +1,17 @@ +KNOWNBUG +main.cpp +--cpp20 --object-bits 12 +^VERIFICATION SUCCESSFUL$ +^EXIT=0$ +^SIGNAL=0$ +-- +^CONVERSION ERROR$ +^.*is unknown.*$ +dropped the body +-- +C++20 std::erase_if on std::vector. + +With the member-typedef conformance fix ([temp.inst]/2, [dcl.typedef]) symex +executes the REAL std::vector / erase_if machinery (no truncation), and the +resulting size assertion is verified soundly within resources. +See doc/architectural/cpp-class-template-instantiation-plan.md. diff --git a/regression/cbmc-cpp/cpp20_erase_if_libcxx/main.cpp b/regression/cbmc-cpp/cpp20_erase_if_libcxx/main.cpp new file mode 100644 index 000000000000..37b041dca9c8 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_erase_if_libcxx/main.cpp @@ -0,0 +1,13 @@ +// C++20 std::erase_if +#include +int main() +{ + std::vector v; + v.push_back(1); + v.push_back(2); + v.push_back(3); + v.push_back(4); + v.push_back(5); + std::erase_if(v, [](int x) { return x % 2 == 0; }); + __CPROVER_assert(v.size() == 3, "erase_if"); +} diff --git a/regression/cbmc-cpp/cpp20_erase_if_libcxx/test.desc b/regression/cbmc-cpp/cpp20_erase_if_libcxx/test.desc new file mode 100644 index 000000000000..17c7b5322f3d --- /dev/null +++ b/regression/cbmc-cpp/cpp20_erase_if_libcxx/test.desc @@ -0,0 +1,20 @@ +KNOWNBUG smt-backend libcxx +main.cpp +--cpp20 --stdlib libc++ --object-bits 12 --unwind 3 --no-unwinding-assertions --slice-formula --property main.assertion.1 --smt2 +^\[main\.assertion\.1\] line 12 erase_if: SUCCESS$ +^VERIFICATION SUCCESSFUL$ +^EXIT=0$ +^SIGNAL=0$ +-- +-- +std::erase_if over std::vector (libc++). Flipped +KNOWNBUG->THOROUGH smt-backend 2026-08-12: the harness assertion +verifies via the SMT backend (~6m15s with z3-checked equivalence; +solver time beyond the CORE budget). The SAT backend's bit-blasting +runs out of memory (>50 GB) on this equation even for the single +property and unwind 3 -- a flattening scale limit, not a front-end +defect (the goto conversion is complete: 34k SSA steps, 1 VCC). +Known solver-side gap: the INCREMENTAL smt2 backend +(--incremental-smt2-solver) aborts on this TU -- convert_expr_to_smt +has no extractbits rule (bv[8] extract from a typecast of an indexed +value, a C++-front-end bv shape); use the classic --smt2 path. diff --git a/regression/cbmc-cpp/cpp20_erase_if_return_type/main.cpp b/regression/cbmc-cpp/cpp20_erase_if_return_type/main.cpp new file mode 100644 index 000000000000..e1883242db39 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_erase_if_return_type/main.cpp @@ -0,0 +1,31 @@ +// Regression for an internal invariant-violation crash (not a wrong result): +// calling std::erase_if (which returns vector::size_type) and discarding the +// result used to corrupt the type of the *following* statement. +// +// std::erase_if is a system-header function template. Its body is converted +// while main is being converted (a nested convert_function). convert_function +// sets the type-checker's current `return_type` to the callee's return type +// (here vector::size_type) and restored it only at its normal end. When +// erase_if's body conversion threw (a separate, still-open instantiation gap) +// and the throw was caught by the system-header guard, `return_type` was left +// pointing at size_type. main's subsequent `return 0;` was then converted +// against that stale type (N5008 [stmt.return]/2 converts the operand to the +// *enclosing* function's return type), so `0` became a 64-bit size_t while +// main's return slot stayed a 32-bit int -- a type-inconsistent assignment that +// tripped the symbolic-execution invariant lhs.type() == rhs.type() and aborted +// CBMC. +// +// The fix makes convert_function restore `return_type` (and the loop-context +// flags) on every exit, including exceptions, via a scope guard. This test +// must complete normally without an invariant violation. (std::erase_if's +// functional effect on the vector is exercised by the companion KNOWNBUG +// cpp20_vector_erase_if; here the call's effect is intentionally not asserted.) +#include + +int main() +{ + std::vector v; + v.push_back(1); + std::erase_if(v, [](int x) { return x == 2; }); + return 0; +} diff --git a/regression/cbmc-cpp/cpp20_erase_if_return_type/test.desc b/regression/cbmc-cpp/cpp20_erase_if_return_type/test.desc new file mode 100644 index 000000000000..a50f97c9d95d --- /dev/null +++ b/regression/cbmc-cpp/cpp20_erase_if_return_type/test.desc @@ -0,0 +1,30 @@ +KNOWNBUG +main.cpp +--cpp20 --unwind 4 --no-unwinding-assertions +^VERIFICATION SUCCESSFUL$ +^EXIT=0$ +^SIGNAL=0$ +-- +^.*invariant violation.*$ +^.*lhs\.type\(\) == rhs\.type\(\).*$ +^CONVERSION ERROR$ +dropped the body +-- +Regression for a convert_function return-type exception-safety crash. +Discarding the std::erase_if(...) result (vector::size_type) used to leave the +type-checker's `return_type` stale (set to size_type by the nested +convert_function of erase_if's body, whose throw was caught by the +system-header guard before the non-exception-safe restore ran). main's +`return 0;` was then typed size_t while main's return slot stayed int, tripping +the symex invariant lhs.type() == rhs.type() (goto_symex.cpp) and aborting CBMC. +The fix restores `return_type` and the loop-context flags on every exit of +convert_function (N5008 [stmt.return]/2: `return` converts to the *enclosing* +function's return type). The forbidden patterns guard against the crash's +return (invariant violation / the specific condition) and against a conversion +error. + +Now that the iterator->const_iterator converting-constructor conversion is +applied during member-call overload resolution, std::erase_if's body no longer +throws -- it converts and runs the genuine vector::erase -- so the call is no +longer a no-op and the BMC is bounded with --unwind to keep this crash-only +regression fast (its functional effect is not asserted here). diff --git a/regression/cbmc-cpp/cpp20_explicit_conversion_function_template_in_copy_initialization/main.cpp b/regression/cbmc-cpp/cpp20_explicit_conversion_function_template_in_copy_initialization/main.cpp new file mode 100644 index 000000000000..86020c8130ae --- /dev/null +++ b/regression/cbmc-cpp/cpp20_explicit_conversion_function_template_in_copy_initialization/main.cpp @@ -0,0 +1,31 @@ +extern "C" void __CPROVER_assert(bool, const char *); +struct wide +{ + unsigned long long w; + // N5008 [over.match.copy]/1.2, [over.match.conv]/1: an explicit conversion + // function template is a candidate in a direct-initialization only (the + // MSVC STL's _Base128::operator _Ty) + template + constexpr explicit operator T() const noexcept + { + return static_cast(w); + } +}; +int pick(int) +{ + return 1; +} +int pick(...) +{ + return 2; +} +int main() +{ + wide b{7}; + __CPROVER_assert( + !__is_convertible(wide, int) && __is_constructible(int, wide) && + static_cast(b) == 7 && pick(b) == 2, + "explicit only when direct"); + __CPROVER_assert(pick(b) == 1, "WRONG (must FAIL)"); + return 0; +} diff --git a/regression/cbmc-cpp/cpp20_explicit_conversion_function_template_in_copy_initialization/test.desc b/regression/cbmc-cpp/cpp20_explicit_conversion_function_template_in_copy_initialization/test.desc new file mode 100644 index 000000000000..21003e3259d4 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_explicit_conversion_function_template_in_copy_initialization/test.desc @@ -0,0 +1,16 @@ +KNOWNBUG +main.cpp +--cpp20 +^\[main\.assertion\.1\] line \d+ explicit only when direct: SUCCESS$ +^\[main\.assertion\.2\] line \d+ WRONG \(must FAIL\): FAILURE$ +^VERIFICATION FAILED$ +^EXIT=10$ +^SIGNAL=0$ +-- +^warning: ignoring +^CONVERSION ERROR$ +-- +An explicit conversion function template was deduced and used for any +implicit conversion, so `wide' converted to int in copy-initialization +and pick(int) was chosen. is_constructible (direct- +initialization) now considers it explicitly. diff --git a/regression/cbmc-cpp/cpp20_extern_template_copy_ctor_abort/main.cpp b/regression/cbmc-cpp/cpp20_extern_template_copy_ctor_abort/main.cpp new file mode 100644 index 000000000000..992294e362e8 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_extern_template_copy_ctor_abort/main.cpp @@ -0,0 +1,54 @@ +// cvise-reduced from a preprocessed libc++ driver: an +// `extern template` declaration of a copy constructor whose class has +// another constructor taking an alias of a NESTED INCOMPLETE class +// template chain (__size_type<...<__pointer>>, where __pointer's +// default argument uses the clang builtin __remove_reference_t) +// ABORTS the front end when the copy constructor is invoked: +// Invariant "expr.function().id() == ID_member" in +// typecheck_method_application (cpp_typecheck_expr.cpp). This crash +// masks all preprocessed-libc++ reductions (vector semantic family, +// ranges silent drop, set_insert). clang++/valgrind run clean +// (clang-only builtin; g++ n/a). + +extern "C" void __CPROVER_assert(bool, const char *); +template +using __libcpp_remove_reference_t = __remove_reference_t(_Tp); +template > +struct __pointer; +template +struct __size_type; +template +struct __alloc_traits_difference_type; +using size_type = __size_type<__alloc_traits_difference_type<__pointer>>; +template +struct basic_string +{ + typedef int value_type; + int v; + basic_string() : v(1) + { + } + basic_string(size_type); + basic_string(const basic_string &o) : v(o.v) + { + } + void __init(const value_type *, size_type, size_type); +}; +extern template void +basic_string::__init(value_type const *, size_type, size_type); +extern template basic_string::basic_string(basic_string const &); +int copy_it(const basic_string &b) +{ + basic_string t = b; + return t.v; +} +int main() +{ + basic_string s; + __CPROVER_assert(copy_it(s) == 1, "copy ctor typechecks"); + return 0; +} + +// pair the extern template declaration with the explicit +// instantiation so the program links stand-alone +template basic_string::basic_string(basic_string const &); diff --git a/regression/cbmc-cpp/cpp20_extern_template_copy_ctor_abort/test.desc b/regression/cbmc-cpp/cpp20_extern_template_copy_ctor_abort/test.desc new file mode 100644 index 000000000000..cd47713dc964 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_extern_template_copy_ctor_abort/test.desc @@ -0,0 +1,17 @@ +KNOWNBUG libcxx +main.cpp +--cpp20 --stdlib libc++ +^\[main\.assertion\.1\] line \d+ copy ctor typechecks: SUCCESS$ +^VERIFICATION SUCCESSFUL$ +^EXIT=0$ +^SIGNAL=0$ +-- +dropped the body +-- +Resolution 2026-07-30: the reproducer is a clang-builtin shape +(__remove_reference_t in a default argument); under --cpp20 alone the +GCC-mode scanner lexes the builtin as a plain identifier, which is a +different (mode-availability) failure -- and the abort it led to is +now a recoverable diagnostic (get_component result checked in the +constructor-temporary path). Run in CLANG mode (--stdlib libc++), +where the original bug lived, the program verifies. diff --git a/regression/cbmc-cpp/cpp20_fold_over_class_pack_in_member/main.cpp b/regression/cbmc-cpp/cpp20_fold_over_class_pack_in_member/main.cpp new file mode 100644 index 000000000000..3b665aa98848 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_fold_over_class_pack_in_member/main.cpp @@ -0,0 +1,48 @@ +// N5008 [expr.prim.fold]/1-2: a fold expression's pack is the one its +// PATTERN names. Here the fold `(0 + ... + get<_Ip>(bound_))` inside a +// member function template folds over the ENCLOSING CLASS template's +// non-type pack `_Ip` while the member has its own pack `A` -- the +// libc++ __bind_back_op / __perfect_forward shape. The member-body fold +// expander previously sized the pack only from replicated FUNCTION +// parameters or from a unique pack_size_map entry, so with both packs +// live the fold was left unexpanded ("unexpected expression: +// cpp_binary_fold") and the whole member body was dropped. +extern "C" void __CPROVER_assert(bool, const char *); +template +struct iseq +{ +}; +template +struct tup +{ + int n_; + tup(T... t) : n_(sizeof...(T)) + { + } +}; +template +int get(tup t) +{ + return t.n_; +} +template +struct pf; +template +struct pf, B...> +{ + tup bound_; + pf(B... b) : bound_(b...) + { + } + template + int call(A &&...a) + { + return (0 + ... + get(bound_)); + } +}; +int main() +{ + pf, int> p(3); + __CPROVER_assert(p.call() == 1, "mem-init in multi-pack partial spec"); + return 0; +} diff --git a/regression/cbmc-cpp/cpp20_fold_over_class_pack_in_member/test.desc b/regression/cbmc-cpp/cpp20_fold_over_class_pack_in_member/test.desc new file mode 100644 index 000000000000..f338b7dba589 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_fold_over_class_pack_in_member/test.desc @@ -0,0 +1,11 @@ +KNOWNBUG +main.cpp +--cpp20 +^\[main\.assertion\.1\] line \d+ mem-init in multi-pack partial spec: SUCCESS$ +^VERIFICATION SUCCESSFUL$ +^EXIT=0$ +^SIGNAL=0$ +-- +dropped the body +-- +Runtime-verified with g++ and clang++. diff --git a/regression/cbmc-cpp/cpp20_format_header/main.cpp b/regression/cbmc-cpp/cpp20_format_header/main.cpp new file mode 100644 index 000000000000..d430da850d4d --- /dev/null +++ b/regression/cbmc-cpp/cpp20_format_header/main.cpp @@ -0,0 +1,13 @@ +// Requires GCC 13+ or Clang (older libstdc++ lacks support). +#if !defined(__GNUC__) && !defined(_MSC_VER) || defined(__clang__) || \ + (__GNUC__ >= 13 && __GNUC__ <= 15) +// C++20: header parsing +# include +int main() +{ +} +#else +int main() +{ +} +#endif diff --git a/regression/cbmc-cpp/cpp20_format_header/test.desc b/regression/cbmc-cpp/cpp20_format_header/test.desc new file mode 100644 index 000000000000..019814ffc600 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_format_header/test.desc @@ -0,0 +1,8 @@ +KNOWNBUG +main.cpp +--cpp20 +^EXIT=0$ +^SIGNAL=0$ +-- +^CONVERSION ERROR$ +-- diff --git a/regression/cbmc-cpp/cpp20_friend_requires_enclosing_param/main.cpp b/regression/cbmc-cpp/cpp20_friend_requires_enclosing_param/main.cpp new file mode 100644 index 000000000000..2279fd2339cc --- /dev/null +++ b/regression/cbmc-cpp/cpp20_friend_requires_enclosing_param/main.cpp @@ -0,0 +1,69 @@ +// N5008 [basic.scope.temp]/2 + [temp.friend]/1: inside a class template, a +// hidden friend's REQUIRES-CLAUSE may name the enclosing template's +// own parameter. This is libc++'s __range_adaptor_closure +// template struct __range_adaptor_closure { +// template +// requires same_as<_Tp, remove_cvref_t<_Closure>> && ... +// friend constexpr decltype(auto) operator|(_View&&, _Closure&&); +// }; +// (the CRTP base that makes `arr | views::take(3)` work). CBMC hoists +// the friend to namespace scope and fails to resolve `Tp` in the +// requires-clause ("symbol 'Tp' is unknown"), drops the candidate, and +// the pipe expression falls back to arithmetic conversion. Sibling of +// the fixed nested-class default-argument case +// (cpp20_member_class_template_own_param_friend): this one is a +// TOP-LEVEL class template and the parameter appears in the +// CONSTRAINT, not a default argument. One of the two remaining +// blockers of cpp20_ranges_basic_libcxx. +extern "C" void __CPROVER_assert(bool, const char *); +template +struct is_same_ +{ + static const bool value = false; +}; +template +struct is_same_ +{ + static const bool value = true; +}; +template +struct remove_cvref_ +{ + using type = T; +}; +template +struct remove_cvref_ +{ + using type = T; +}; +template +struct remove_cvref_ +{ + using type = T; +}; +template +concept same_as_ = is_same_::type>::value; +template +struct closure_base +{ + template + requires same_as_ + friend decltype(auto) operator|(View &&v, Closure &&c) + { + return c(v); + } +}; +struct times2 : closure_base +{ + int operator()(int x) const + { + return 2 * x; + } +}; +int main() +{ + times2 t; + int r = 21 | t; + __CPROVER_assert(r == 42, "pipe through CRTP closure base"); + return 0; +} diff --git a/regression/cbmc-cpp/cpp20_friend_requires_enclosing_param/test.desc b/regression/cbmc-cpp/cpp20_friend_requires_enclosing_param/test.desc new file mode 100644 index 000000000000..a2a7a29817ef --- /dev/null +++ b/regression/cbmc-cpp/cpp20_friend_requires_enclosing_param/test.desc @@ -0,0 +1,14 @@ +KNOWNBUG +main.cpp +--cpp20 +^\[main\.assertion\.1\] line \d+ pipe through CRTP closure base: SUCCESS$ +^VERIFICATION SUCCESSFUL$ +^EXIT=0$ +^SIGNAL=0$ +-- +dropped the body +-- +Currently: "symbol 'Tp' is unknown" resolving the friend's +requires-clause at namespace scope; the candidate is dropped and main +fails with "invalid implicit conversion from 'struct times2' to +'signed int'". diff --git a/regression/cbmc-cpp/cpp20_friend_specialization_of_function_template_in_another_namespace/main.cpp b/regression/cbmc-cpp/cpp20_friend_specialization_of_function_template_in_another_namespace/main.cpp new file mode 100644 index 000000000000..0ff0c51e75e3 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_friend_specialization_of_function_template_in_another_namespace/main.cpp @@ -0,0 +1,78 @@ +// N5008 [temp.friend]/1: a friend declaration whose declarator-id is a +// template-id naming a specialization of a function template declared in +// another namespace (`friend constexpr partial cat::make(cat::ord) +// noexcept;') befriends that specialization and declares nothing; the +// specialization may then call the private constructor. The shape of +// libstdc++ 16's (partial_ordering and __cmp_cat::__make). The +// front end created an unrelated weak function symbol named after the +// template-id instead, the real specialization was not a friend, its body +// was dropped ("member 'partial::partial(...)' is not accessible") and the +// conversion returned nondet. +extern "C" void __CPROVER_assert(bool, const char *); +namespace cat +{ +enum class ord : signed char +{ + equivalent = 0, + less = -1, + greater = 1 +}; +template +constexpr ord ordv(O o) noexcept +{ + return ord(o.v); +} +template +constexpr O make(ord o) noexcept +{ + return O(o); +} +} // namespace cat +class partial +{ + constexpr explicit partial(cat::ord o) noexcept + : v(static_cast(o)) + { + } + friend constexpr cat::ord cat::ordv(partial) noexcept; + friend constexpr partial cat::make(cat::ord) noexcept; + +public: + signed char v; + static const partial less; +}; +class strong +{ + constexpr explicit strong(cat::ord o) noexcept + : v(static_cast(o)) + { + } + friend constexpr cat::ord cat::ordv(strong) noexcept; + friend constexpr strong cat::make(cat::ord) noexcept; + +public: + signed char v; + constexpr operator partial() const noexcept + { + return cat::make(cat::ord(v)); + } + static const strong greater; +}; +inline constexpr partial partial::less(cat::ord::less); +inline constexpr strong strong::greater(cat::ord::greater); +bool is_lt(partial p) +{ + return p.v < 0; +} +int main() +{ + partial p = strong::greater; + __CPROVER_assert( + p.v == 1, "conversion through befriended template specialization"); + __CPROVER_assert(!is_lt(strong::greater), "strong to partial at call"); + __CPROVER_assert( + cat::ordv(strong::greater) == cat::ord::greater, + "befriended ordv specialization"); + __CPROVER_assert(false, "WRONG (must FAIL)"); + return 0; +} diff --git a/regression/cbmc-cpp/cpp20_friend_specialization_of_function_template_in_another_namespace/test.desc b/regression/cbmc-cpp/cpp20_friend_specialization_of_function_template_in_another_namespace/test.desc new file mode 100644 index 000000000000..f85441f48a94 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_friend_specialization_of_function_template_in_another_namespace/test.desc @@ -0,0 +1,16 @@ +KNOWNBUG +main.cpp +--cpp20 +^\[main\.assertion\.1\] .* conversion through befriended template specialization: SUCCESS$ +^\[main\.assertion\.2\] .* strong to partial at call: SUCCESS$ +^\[main\.assertion\.3\] .* befriended ordv specialization: SUCCESS$ +^\[main\.assertion\.4\] .* WRONG \(must FAIL\): FAILURE$ +^VERIFICATION FAILED$ +^EXIT=10$ +^SIGNAL=0$ +-- +^warning: ignoring +^CONVERSION ERROR$ +-- +g++ 13 (-fsanitize=address,undefined) and clang++ 18 accept this program, +and it fails only its WRONG assertion. diff --git a/regression/cbmc-cpp/cpp20_hidden_friend_found_only_by_adl/main.cpp b/regression/cbmc-cpp/cpp20_hidden_friend_found_only_by_adl/main.cpp new file mode 100644 index 000000000000..83509b1dc47b --- /dev/null +++ b/regression/cbmc-cpp/cpp20_hidden_friend_found_only_by_adl/main.cpp @@ -0,0 +1,47 @@ +extern "C" void __CPROVER_assert(bool, const char *); +namespace ns +{ +struct sentinel +{ + // N5008 [dcl.meaning.general]/2, [basic.lookup.argdep]/4.2: a friend function + // first declared in a class is visible only to argument-dependent lookup + // with that class associated + template + friend bool operator==(const T &, const T &) + { + return true; + } +}; +struct X +{ + int v; +}; +} // namespace ns +template +constexpr bool has_eq = requires(const T &a, const T &b) { a == b; }; +// a class template: the friend is declared by each specialization, and +// found for an argument whose associated classes include one ([basic.lookup. +// argdep]/3: a template argument's class) +template +struct box +{ + U u; + friend int count(const box &) + { + return 1; + } + template + friend int tag(const V &, const box &) + { + return 2; + } +}; +int main() +{ + __CPROVER_assert(!has_eq, "hidden friend not found for X"); + __CPROVER_assert(has_eq, "found for sentinel"); + box b{}; + __CPROVER_assert(tag(0, b) == 2, "friend template found by ADL"); + __CPROVER_assert(has_eq, "WRONG (must FAIL)"); + return 0; +} diff --git a/regression/cbmc-cpp/cpp20_hidden_friend_found_only_by_adl/test.desc b/regression/cbmc-cpp/cpp20_hidden_friend_found_only_by_adl/test.desc new file mode 100644 index 000000000000..96e891157f4d --- /dev/null +++ b/regression/cbmc-cpp/cpp20_hidden_friend_found_only_by_adl/test.desc @@ -0,0 +1,21 @@ +KNOWNBUG +main.cpp +--cpp20 +^\[main\.assertion\.1\] line \d+ hidden friend not found for X: SUCCESS$ +^\[main\.assertion\.2\] line \d+ found for sentinel: SUCCESS$ +^\[main\.assertion\.3\] line \d+ friend template found by ADL: SUCCESS$ +^\[main\.assertion\.4\] line \d+ WRONG \(must FAIL\): FAILURE$ +^VERIFICATION FAILED$ +^EXIT=10$ +^SIGNAL=0$ +-- +^warning: ignoring +^CONVERSION ERROR$ +-- +A friend function template first declared in a class was entered into the +enclosing namespace and found by ordinary lookup for any arguments, so +`a == b' was valid for an unrelated class. libc++'s unreachable_sentinel_t +has such an operator==, and evaluating it for an iterator during the +instantiation of iterator_traits cached a wrong +__is_primary_template> ("already declared with +different type", cpp20_concept_iterator_chain on macOS). diff --git a/regression/cbmc-cpp/cpp20_hidden_friend_of_member_class_not_instantiated/main.cpp b/regression/cbmc-cpp/cpp20_hidden_friend_of_member_class_not_instantiated/main.cpp new file mode 100644 index 000000000000..e264f4032e68 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_hidden_friend_of_member_class_not_instantiated/main.cpp @@ -0,0 +1,45 @@ +// N5008 [temp.inst]/3.1: instantiating a class template specialization +// instantiates the declarations, not the definitions, of the friend +// functions defined in it -- also in its member classes. The definition of +// view::sentinel's `operator-', ill-formed for that +// specialization, was instantiated (and dropped) although nothing uses it +// (libc++'s iota_view::__sentinel). +extern "C" void __CPROVER_assert(bool, const char *); + +struct unreachable +{ +}; + +template +struct view +{ + struct iterator + { + S value; + }; + struct sentinel + { + B bound = B(); + sentinel() = default; + explicit sentinel(B b) : bound(b) + { + } + friend int operator-(const iterator &x, const sentinel &y) + { + return x.value - y.bound; + } + }; + S start; + B bound; +}; + +int main() +{ + view v{1, {}}; + view::iterator i{1}; + view::sentinel e{4}; + __CPROVER_assert(i - e == -3, "the friend of view"); + __CPROVER_assert(v.start == 1, "view"); + __CPROVER_assert(false, "WRONG (must FAIL)"); + return 0; +} diff --git a/regression/cbmc-cpp/cpp20_hidden_friend_of_member_class_not_instantiated/test.desc b/regression/cbmc-cpp/cpp20_hidden_friend_of_member_class_not_instantiated/test.desc new file mode 100644 index 000000000000..32749ee709c8 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_hidden_friend_of_member_class_not_instantiated/test.desc @@ -0,0 +1,15 @@ +KNOWNBUG +main.cpp +--cpp20 +^\[main\.assertion\.1\] .* the friend of view: SUCCESS$ +^\[main\.assertion\.2\] .* view: SUCCESS$ +^\[main\.assertion\.3\] .* WRONG \(must FAIL\): FAILURE$ +^VERIFICATION FAILED$ +^EXIT=10$ +^SIGNAL=0$ +-- +^warning: ignoring +dropped the body +-- +N5008 [temp.inst]/5: hidden friends of member classes of class template +specializations are instantiated only when odr-used. diff --git a/regression/cbmc-cpp/cpp20_hidden_friend_operator_template/main.cpp b/regression/cbmc-cpp/cpp20_hidden_friend_operator_template/main.cpp new file mode 100644 index 000000000000..4b1f247cabe9 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_hidden_friend_operator_template/main.cpp @@ -0,0 +1,31 @@ +// N5008 [class.friend]/1 + [dcl.meaning.general]/2.3: a friend function +// TEMPLATE defined inside a class is a namespace member found by ADL. +// CBMC discarded such declarations entirely (only friend class +// templates were handled), so the range-adaptor pipe idiom's hidden +// friend operator| never existed and `arr | closure` fell into the +// C-layer arithmetic conversion, silently dropping main (vacuous +// SUCCESS). Reduced from libc++ __range_adaptor_closure. +// g++/clang++ accept and verify at runtime. +extern "C" void __CPROVER_assert(bool, const char *); + +struct closure_t +{ + template + int operator()(R &&r) + { + return r[0]; + } + template + friend int operator|(_View &&__view, _Closure __closure) + { + return __closure(__view); + } +}; + +int main() +{ + int arr[]{3}; + closure_t c{}; + int x = arr | c; + __CPROVER_assert(x == 3, "pipe through hidden friend"); +} diff --git a/regression/cbmc-cpp/cpp20_hidden_friend_operator_template/test.desc b/regression/cbmc-cpp/cpp20_hidden_friend_operator_template/test.desc new file mode 100644 index 000000000000..97f6d9d294c2 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_hidden_friend_operator_template/test.desc @@ -0,0 +1,13 @@ +KNOWNBUG +main.cpp +--cpp20 +^\[main\.assertion\.1\] line \d+ pipe through hidden friend: SUCCESS$ +^VERIFICATION SUCCESSFUL$ +^EXIT=0$ +^SIGNAL=0$ +-- +dropped the body +-- +Hidden friend operator template ([class.friend]/1, +[dcl.meaning.general]/2.3): the ranges pipe idiom's operator| must be +found and applied; it used to be silently discarded. diff --git a/regression/cbmc-cpp/cpp20_hidden_friend_spaceship_template_alias_return_type/main.cpp b/regression/cbmc-cpp/cpp20_hidden_friend_spaceship_template_alias_return_type/main.cpp new file mode 100644 index 000000000000..3b3d5aead72f --- /dev/null +++ b/regression/cbmc-cpp/cpp20_hidden_friend_spaceship_template_alias_return_type/main.cpp @@ -0,0 +1,35 @@ +// N5008 [over.match.oper]/3.4: for `a < b', the rewritten candidates +// include every operator<=> found for `a <=> b', here a hidden friend +// template ([class.friend]/5) of the class template. Its return type is an +// alias template whose arguments depend on the enclosing class's parameter +// T -- the shape of libstdc++ 16's __normal_iterator, whose return type is +// std::__detail::__synth3way_t<_Iterator, _Iter>. +#include +extern "C" void __CPROVER_assert(bool, const char *); + +namespace detail +{ +template +using three_way_t = std::strong_ordering; +} + +template +struct iter +{ + T p; + template + friend detail::three_way_t operator<=>(const iter &l, const iter &r) + { + return l.p < r.p ? std::strong_ordering::less + : r.p < l.p ? std::strong_ordering::greater + : std::strong_ordering::equal; + } +}; + +int main() +{ + iter a{1}, b{2}; + __CPROVER_assert(a < b, "a < b"); + __CPROVER_assert(!(b < a), "!(b < a)"); + __CPROVER_assert(b < a, "WRONG (must FAIL)"); +} diff --git a/regression/cbmc-cpp/cpp20_hidden_friend_spaceship_template_alias_return_type/test.desc b/regression/cbmc-cpp/cpp20_hidden_friend_spaceship_template_alias_return_type/test.desc new file mode 100644 index 000000000000..e4f0dfe075de --- /dev/null +++ b/regression/cbmc-cpp/cpp20_hidden_friend_spaceship_template_alias_return_type/test.desc @@ -0,0 +1,21 @@ +KNOWNBUG +main.cpp +--cpp20 +^\[main\.assertion\.1\] line \d+ a < b: SUCCESS$ +^\[main\.assertion\.2\] line \d+ !\(b < a\): SUCCESS$ +^\[main\.assertion\.3\] line \d+ WRONG \(must FAIL\): FAILURE$ +^\*\* 1 of \d+ failed +^VERIFICATION FAILED$ +^EXIT=10$ +^SIGNAL=0$ +-- +^CONVERSION ERROR$ +no comparison operator +-- +Fixed: cbmc reported "no comparison operator for an operand of class type +'struct iter'": the hidden friend's return type named T, the enclosing +class template's parameter, which was unbound once the friend was hoisted +to the namespace ("symbol 'T' is unknown"). With libstdc++ 16, +std::string::iterator was not random_access_iterator because of this, +and _Seq_sink::_M_reserve and _M_span of lost their bodies. +Reduced from that with cvise (g++ 16 as the validity check). diff --git a/regression/cbmc-cpp/cpp20_hidden_friend_template_operator_pipe/main.cpp b/regression/cbmc-cpp/cpp20_hidden_friend_template_operator_pipe/main.cpp new file mode 100644 index 000000000000..dc5b89284ff1 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_hidden_friend_template_operator_pipe/main.cpp @@ -0,0 +1,31 @@ +extern "C" void __CPROVER_assert(bool, const char *); +template +constexpr bool is_lvalue_reference_v = false; +template +constexpr bool is_lvalue_reference_v<_Tp &> = true; +namespace ranges +{ +template +concept viewable_range = is_lvalue_reference_v<_Tp>; +} +template +struct range_adaptor +{ + // [temp.deduct.call]/3: _View&& with _View a (constrained) template + // parameter is a forwarding reference; for the lvalue array + // argument _View deduces to int (&)[5] ([temp.deduct.call]/2). + template + friend int operator|(_View &&__view, range_adaptor) + { + return __view[1]; + } +}; +int main() +{ + int arr[] = {1, 2, 3, 4, 5}; + range_adaptor take3; + int r = arr | take3; + __CPROVER_assert( + r == 2, "array lvalue binds forwarding ref of constrained friend"); + return 0; +} diff --git a/regression/cbmc-cpp/cpp20_hidden_friend_template_operator_pipe/test.desc b/regression/cbmc-cpp/cpp20_hidden_friend_template_operator_pipe/test.desc new file mode 100644 index 000000000000..168c4f3d3d9f --- /dev/null +++ b/regression/cbmc-cpp/cpp20_hidden_friend_template_operator_pipe/test.desc @@ -0,0 +1,17 @@ +KNOWNBUG +main.cpp +--cpp20 +^\[main\.assertion\.1\] line 28 array lvalue binds forwarding ref of constrained friend: SUCCESS$ +^VERIFICATION SUCCESSFUL$ +^EXIT=0$ +^SIGNAL=0$ +-- +dropped the body +-- +A hidden friend function TEMPLATE of a class template uses the +injected-class-name as a parameter type and a constrained forwarding +reference for the piped operand (the libc++ range-adaptor +`operator|` shape, N5008 [temp.friend]/1, [temp.local]/1, +[temp.deduct.call]/2-3). The friend must remain callable after +hoisting to namespace scope, with the bare class name denoting the +defining instantiation. diff --git a/regression/cbmc-cpp/cpp20_implicit_copy_assignment_deleted_by_base/main.cpp b/regression/cbmc-cpp/cpp20_implicit_copy_assignment_deleted_by_base/main.cpp new file mode 100644 index 000000000000..aade2afd74d8 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_implicit_copy_assignment_deleted_by_base/main.cpp @@ -0,0 +1,38 @@ +extern "C" void __CPROVER_assert(bool, const char *); +class pbase +{ + friend struct pr; + pbase() = default; + pbase(const pbase &) = default; + pbase &operator=(const pbase &) = delete; +}; +struct nonesuch +{ +}; +struct pr : private pbase +{ + const int first; + int second; + pr(int a, int b) : first(a), second(b) + { + } + pr(const pr &) = default; + // not a copy assignment operator: the implicit one is declared, and + // defined as deleted ([class.copy.assign]/7: the base's is deleted) + pr &operator=(const nonesuch &) + { + return *this; + } +}; +template +concept assignable = requires(L l, R &&r) { l = static_cast(r); }; +int main() +{ + // N5008 [expr.prim.req.general]/5: the requirement is not satisfied + static_assert(!assignable); + pr p(1, 2); + pr q = p; + __CPROVER_assert(q.first == 1 && q.second == 2, "copy constructed"); + __CPROVER_assert(false, "WRONG (must FAIL)"); + return 0; +} diff --git a/regression/cbmc-cpp/cpp20_implicit_copy_assignment_deleted_by_base/test.desc b/regression/cbmc-cpp/cpp20_implicit_copy_assignment_deleted_by_base/test.desc new file mode 100644 index 000000000000..17562f9b4581 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_implicit_copy_assignment_deleted_by_base/test.desc @@ -0,0 +1,17 @@ +KNOWNBUG +main.cpp +--cpp20 +^\[main\.assertion\.1\] line \d+ copy constructed: SUCCESS$ +^\[main\.assertion\.2\] line \d+ WRONG \(must FAIL\): FAILURE$ +^VERIFICATION FAILED$ +^EXIT=10$ +^SIGNAL=0$ +-- +^CONVERSION ERROR$ +inaccessible copy assignment operator +-- +N5008 [class.copy.assign]/7: the implicit copy assignment operator of a class +whose direct base deletes its own is defined as deleted, so a +requires-expression using it is not satisfied ([expr.prim.req.general]/5). +libstdc++ 11's assignable_from &, ...> (cpp20_map_basic on +GCC 11) failed to define it instead. diff --git a/regression/cbmc-cpp/cpp20_incrementable_traits_pointer/main.cpp b/regression/cbmc-cpp/cpp20_incrementable_traits_pointer/main.cpp new file mode 100644 index 000000000000..7604013eff57 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_incrementable_traits_pointer/main.cpp @@ -0,0 +1,25 @@ +// libstdc++'s under -std=c++20: incrementable_traits -- +// its partial specializations `requires is_object_v<_Tp>' for `_Tp *' and +// `requires requires { typename _Iter::difference_type; }' for `_Iter'. +// Checking the second for `int *' resolved `int *::difference_type' +// (ill-formed, N5008 [basic.lookup.qual.general]/1 -- a substitution +// failure here) by a name-based scope search that found the class being +// matched and re-elaborated it without end (stack overflow). A +// specialization whose partial specializations are being matched is not +// elaborated again from within that matching. +#include +#include +extern "C" void __CPROVER_assert(bool, const char *); +int main() +{ + std::array a = {1, 2, 3}; + __CPROVER_assert(a[1] == 2, "array element"); + int raw[3] = {4, 5, 6}; + __CPROVER_assert(std::distance(raw, raw + 3) == 3, "distance over pointers"); + static_assert( + std::same_as< + std::incrementable_traits::difference_type, + std::ptrdiff_t>, + "pointer difference_type"); + return 0; +} diff --git a/regression/cbmc-cpp/cpp20_incrementable_traits_pointer/test.desc b/regression/cbmc-cpp/cpp20_incrementable_traits_pointer/test.desc new file mode 100644 index 000000000000..6e4c3fe769ea --- /dev/null +++ b/regression/cbmc-cpp/cpp20_incrementable_traits_pointer/test.desc @@ -0,0 +1,14 @@ +KNOWNBUG +main.cpp +--cpp20 +^EXIT=0$ +^SIGNAL=0$ +^VERIFICATION SUCCESSFUL$ +-- +^warning: ignoring +^CONVERSION ERROR$ +dropped the body +-- +elaborate_class_template refuses to re-enter the elaboration of a +specialization whose partial specializations are being matched +(elaborations_in_progress). diff --git a/regression/cbmc-cpp/cpp20_inherited_ctor_symex_crash/main.cpp b/regression/cbmc-cpp/cpp20_inherited_ctor_symex_crash/main.cpp new file mode 100644 index 000000000000..e6311e2fda3d --- /dev/null +++ b/regression/cbmc-cpp/cpp20_inherited_ctor_symex_crash/main.cpp @@ -0,0 +1,75 @@ +// Distilled from libc++ 's __bind_back_t (the ranges pipe +// adaptor): a class template INHERITING CONSTRUCTORS ([class.inhctor.init]) +// from a partial-specialization-selected base whose arguments involve a +// variable template (tuple_size_v) and __make_integer_seq. The front +// end converts this, but symex CRASHES on an invariant: +// goto_symex.cpp:80 symex_assign: lhs.type() == rhs.type() +// i.e. the synthesized inherited/default constructor assigns with +// mismatched types (front-end wrong-code surfacing as a back-end +// invariant). clang++ accepts and runs this clean. +extern "C" void __CPROVER_assert(bool, const char *); +template +struct integral_constant +{ + static const int value = __v; +}; +template +struct integer_sequence +{ +}; +template +using index_sequence = integer_sequence; +template +using __make_integer_sequence = __make_integer_seq; +template +using make_index_sequence = __make_integer_sequence; +template +struct tuple +{ +}; +template +struct tuple_size; +template +struct tuple_size> : integral_constant +{ +}; +template +constexpr long tuple_size_v = tuple_size<_Tp>::value; +template +struct __perfect_forward_impl; +template +struct __perfect_forward_impl<_Op, index_sequence<_Idx...>, _Bound...> +{ + __perfect_forward_impl() + { + } + static const int value = 100 + sizeof...(_Idx) * 10 + sizeof...(_Bound); +}; +template +using __perfect_forward = + __perfect_forward_impl<_Op, make_index_sequence, _Args...>; +template > +struct __bind_back_op; +template +struct __bind_back_op<_NBound, index_sequence<_Ip...>> +{ +}; +template +struct __bind_back_t + : __perfect_forward<__bind_back_op>, _Fn, _BoundArgs> +{ + using __perfect_forward< + __bind_back_op>, + _Fn, + _BoundArgs>::__perfect_forward; +}; +struct F +{ +}; +int main() +{ + __bind_back_t> b; + __CPROVER_assert( + __perfect_forward_impl>::value == 120, "pf"); + return 0; +} diff --git a/regression/cbmc-cpp/cpp20_inherited_ctor_symex_crash/test.desc b/regression/cbmc-cpp/cpp20_inherited_ctor_symex_crash/test.desc new file mode 100644 index 000000000000..e1bc9cfc6c45 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_inherited_ctor_symex_crash/test.desc @@ -0,0 +1,17 @@ +KNOWNBUG libcxx +main.cpp +--cpp20 --stdlib libc++ +^\[main\.assertion\.1\] line \d+ pf: SUCCESS$ +^VERIFICATION SUCCESSFUL$ +^EXIT=0$ +^SIGNAL=0$ +-- +dropped the body +-- +symex invariant crash (lhs.type() == rhs.type()) on the inherited- +constructor chain; banked 2026-08-05 (round 13) while diagnosing the +ranges pipe residual. clang builtins => CLANG mode. +Fixed 2026-08-05 (round 14): the partial-spec pattern re-deduction's +pack bindings are replayed into the active template map for the +instance's own body conversion, so the sizeof...-based static member +initializer resolves and no raw parse tree reaches goto conversion. diff --git a/regression/cbmc-cpp/cpp20_inline_ns_qualified/main.cpp b/regression/cbmc-cpp/cpp20_inline_ns_qualified/main.cpp new file mode 100644 index 000000000000..92971b0303d7 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_inline_ns_qualified/main.cpp @@ -0,0 +1,14 @@ +#if !defined(_MSC_VER) && __has_include() +// Inline namespace qualified lookup: std::suspend_never +# include +int main() +{ + std::suspend_never sn; + __CPROVER_assert(sn.await_ready(), "suspend_never"); +} + +#else +int main() +{ +} +#endif diff --git a/regression/cbmc-cpp/cpp20_inline_ns_qualified/test.desc b/regression/cbmc-cpp/cpp20_inline_ns_qualified/test.desc new file mode 100644 index 000000000000..364d916d224e --- /dev/null +++ b/regression/cbmc-cpp/cpp20_inline_ns_qualified/test.desc @@ -0,0 +1,9 @@ +KNOWNBUG +main.cpp +--cpp20 +^VERIFICATION SUCCESSFUL$ +^EXIT=0$ +^SIGNAL=0$ +-- +dropped the body +-- diff --git a/regression/cbmc-cpp/cpp20_invoke_chain_pack_forwarding/main.cpp b/regression/cbmc-cpp/cpp20_invoke_chain_pack_forwarding/main.cpp new file mode 100644 index 000000000000..f66537fd4810 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_invoke_chain_pack_forwarding/main.cpp @@ -0,0 +1,43 @@ +// N5008 [temp.variadic]/9 + [temp.deduct.general]/5: a heterogeneous parameter +// pack (int*, int) forwarded through the libc++ __invoke / +// __invokable_r / invoke_result_t chain -- `declval()...` inside a +// static member's decltype, then `declval()...` inside __invoke's +// trailing return -- must keep its element list intact. CBMC drops +// main here: resolving __invoke's `operator()` finds no match, because +// the pack that reaches the inner decltype has its second element +// replaced by the first (round-62 reduction of the libc++ ranges pipe +// showed invoke_result_t becoming __invoke_of). +// 27 lines; g++ and clang++ both accept (-Werror) and run clean. +extern "C" void __CPROVER_assert(bool, const char *); +template +T &&declval(); +struct fn +{ + int operator()(int *p, int n) + { + return p[0] + n; + } +}; +template +decltype(declval()(declval()...)) __invoke(F, A &&...); +template +struct invokable_r +{ + template + static decltype(__invoke(declval(), declval()...)) try_call(int); + using result = decltype(try_call(0)); +}; +template +using invoke_result_t = typename invokable_r::result; +template +invoke_result_t invoke(F f, A &&...a) +{ + return f(static_cast(a)...); +} +int main() +{ + int arr[1]{4}; + // heterogeneous (int*, int): the bleed duplicated element 1 into slot 2 + __CPROVER_assert(invoke(fn{}, arr, 3) == 7, "no pack bleed in invoke chain"); + return 0; +} diff --git a/regression/cbmc-cpp/cpp20_invoke_chain_pack_forwarding/test.desc b/regression/cbmc-cpp/cpp20_invoke_chain_pack_forwarding/test.desc new file mode 100644 index 000000000000..1f6caf8dbb0e --- /dev/null +++ b/regression/cbmc-cpp/cpp20_invoke_chain_pack_forwarding/test.desc @@ -0,0 +1,18 @@ +KNOWNBUG +main.cpp +--cpp20 +^\[main\.assertion\.1\] line \d+ no pack bleed in invoke chain: SUCCESS$ +^VERIFICATION SUCCESSFUL$ +^EXIT=0$ +^SIGNAL=0$ +-- +dropped the body +-- +Fixed in round 70: a pack expansion whose pattern IS the bare pack +reference is now substituted element-wise in apply()'s template-argument +replication path ([temp.variadic]/9), instead of relying on the flat +map's short-name bridge -- which picked another live template's +same-named pack and left the replicas as the bare name, so every element +collapsed to the pack's first ((int*, int) became (int*, int*)). +Verified to FAIL (vacuous: main dropped, 0 assertions) with the fix +reverted. Runtime-verified with g++ and clang++. diff --git a/regression/cbmc-cpp/cpp20_invoke_result_bind_back_libcxx/main.cpp b/regression/cbmc-cpp/cpp20_invoke_result_bind_back_libcxx/main.cpp new file mode 100644 index 000000000000..bb3c36793e59 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_invoke_result_bind_back_libcxx/main.cpp @@ -0,0 +1,24 @@ +#include <__functional/bind_back.h> + +#include +#include + +extern "C" void __CPROVER_assert(bool, const char *); + +struct at +{ + int operator()(int (&a)[5], int n) const + { + return a[n]; + } +}; + +using B = decltype(std::__bind_back(at{}, 2)); +using R = std::invoke_result_t; + +int main() +{ + __CPROVER_assert(std::is_same_v, "invoke_result_t"); + __CPROVER_assert(false, "WRONG (must FAIL)"); + return 0; +} diff --git a/regression/cbmc-cpp/cpp20_invoke_result_bind_back_libcxx/test.desc b/regression/cbmc-cpp/cpp20_invoke_result_bind_back_libcxx/test.desc new file mode 100644 index 000000000000..adaae9eb6dcc --- /dev/null +++ b/regression/cbmc-cpp/cpp20_invoke_result_bind_back_libcxx/test.desc @@ -0,0 +1,18 @@ +KNOWNBUG libcxx +main.cpp +--cpp20 --stdlib libc++ --object-bits 12 +^\[main\.assertion\.1\] line \d+ invoke_result_t: SUCCESS$ +^\[main\.assertion\.2\] line \d+ WRONG \(must FAIL\): FAILURE$ +^VERIFICATION FAILED$ +^EXIT=10$ +^SIGNAL=0$ +-- +^warning: ignoring +^CONVERSION ERROR$ +-- +libc++ (LLVM 18): std::invoke_result_t of a std::__bind_back closure (N5008 +[meta.trans.other], [func.require]). Fixed by +cpp11_class_pack_expanded_in_member_trailing_return and +cpp11_namespace_scope_decltype_deduces_full_pack (found by cvise +reductions). clang++ 18 -stdlib=libc++ accepts this program, and it fails +only its WRONG assertion. diff --git a/regression/cbmc-cpp/cpp20_iostream_basic/main.cpp b/regression/cbmc-cpp/cpp20_iostream_basic/main.cpp new file mode 100644 index 000000000000..98a52410bbe8 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_iostream_basic/main.cpp @@ -0,0 +1,5 @@ +// C++20 header +#include +int main() +{ +} diff --git a/regression/cbmc-cpp/cpp20_iostream_basic/test.desc b/regression/cbmc-cpp/cpp20_iostream_basic/test.desc new file mode 100644 index 000000000000..b97e7462afa8 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_iostream_basic/test.desc @@ -0,0 +1,11 @@ +KNOWNBUG +main.cpp +--cpp20 --object-bits 12 +^EXIT=0$ +^SIGNAL=0$ +-- +^CONVERSION ERROR$ +dropped the body +-- +--object-bits 12: with the MSVC 14.44 STL (VS 2022) and its C library +models the program has more than the 256 objects of --object-bits 8. diff --git a/regression/cbmc-cpp/cpp20_iostream_basic_libcxx/main.cpp b/regression/cbmc-cpp/cpp20_iostream_basic_libcxx/main.cpp new file mode 100644 index 000000000000..98a52410bbe8 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_iostream_basic_libcxx/main.cpp @@ -0,0 +1,5 @@ +// C++20 header +#include +int main() +{ +} diff --git a/regression/cbmc-cpp/cpp20_iostream_basic_libcxx/test.desc b/regression/cbmc-cpp/cpp20_iostream_basic_libcxx/test.desc new file mode 100644 index 000000000000..7005bd55fe01 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_iostream_basic_libcxx/test.desc @@ -0,0 +1,9 @@ +KNOWNBUG libcxx +main.cpp +--cpp20 --stdlib libc++ +^VERIFICATION +^EXIT=(0|10)$ +^SIGNAL=0$ +-- +-- +libc++ PARSING ERROR: header fails to parse with libc++. diff --git a/regression/cbmc-cpp/cpp20_is_constant_evaluated_forwarded_through_constexpr_function/main.cpp b/regression/cbmc-cpp/cpp20_is_constant_evaluated_forwarded_through_constexpr_function/main.cpp new file mode 100644 index 000000000000..6eb1996beeac --- /dev/null +++ b/regression/cbmc-cpp/cpp20_is_constant_evaluated_forwarded_through_constexpr_function/main.cpp @@ -0,0 +1,59 @@ +// N5008 [meta.const.eval]/1: is_constant_evaluated() is true within a +// manifestly constant-evaluated context, such as the initializer of a +// constexpr variable ([dcl.constexpr]/6, [expr.const]) or a case label +// ([stmt.switch]/2). libstdc++'s std::__is_constant_evaluated() forwards +// __builtin_is_constant_evaluated(), whose type is _Bool, and its +// string_view::operator[] tests it in the precondition check: +// GCC 16's reads `_Escapes<_CharT>::_S_newline()[0]' in a case +// label of __should_escape_ascii. +extern "C" void __CPROVER_assert(bool, const char *); + +constexpr bool in_constant_evaluation() noexcept +{ + return __builtin_is_constant_evaluated(); +} + +constexpr int which() +{ + if(in_constant_evaluation()) + return 1; + return 2; +} + +struct view +{ + const char *str; + constexpr char operator[](unsigned long i) const + { + if(in_constant_evaluation() && i > 1) + __builtin_unreachable(); + return str[i]; + } +}; + +consteval view escapes() +{ + return {"\t\n"}; +} + +bool should_escape(char c) +{ + switch(c) + { + case escapes()[1]: + return true; + default: + return false; + } +} + +int main() +{ + constexpr int at_compile_time = which(); + __CPROVER_assert(at_compile_time == 1, "constant evaluation"); + __CPROVER_assert(which() == 2, "run time"); + __CPROVER_assert(should_escape('\n'), "case label"); + __CPROVER_assert(!should_escape('a'), "default"); + __CPROVER_assert(should_escape('a'), "WRONG (must FAIL)"); + return 0; +} diff --git a/regression/cbmc-cpp/cpp20_is_constant_evaluated_forwarded_through_constexpr_function/test.desc b/regression/cbmc-cpp/cpp20_is_constant_evaluated_forwarded_through_constexpr_function/test.desc new file mode 100644 index 000000000000..08abb78d2e5e --- /dev/null +++ b/regression/cbmc-cpp/cpp20_is_constant_evaluated_forwarded_through_constexpr_function/test.desc @@ -0,0 +1,22 @@ +KNOWNBUG gnu-extensions +main.cpp +--cpp20 +^\[main\.assertion\.1\] line \d+ constant evaluation: SUCCESS$ +^\[main\.assertion\.2\] line \d+ run time: SUCCESS$ +^\[main\.assertion\.3\] line \d+ case label: SUCCESS$ +^\[main\.assertion\.4\] line \d+ default: SUCCESS$ +^\[main\.assertion\.5\] line \d+ WRONG \(must FAIL\): FAILURE$ +^\*\* 1 of \d+ failed +^VERIFICATION FAILED$ +^EXIT=10$ +^SIGNAL=0$ +-- +^warning: ignoring +expected constant expression +-- +A constexpr function returning __builtin_is_constant_evaluated() (type +_Bool) gave an unfolded `(_Bool)true' during constant evaluation, which is +not a constant: the constexpr variable was initialized at run time (2) and +the case label was rejected, dropping should_escape's body. +gnu-extensions: the program calls __builtin_unreachable, which Visual +Studio mode does not declare. diff --git a/regression/cbmc-cpp/cpp20_istringstream_string_allocator_delegation/main.cpp b/regression/cbmc-cpp/cpp20_istringstream_string_allocator_delegation/main.cpp new file mode 100644 index 000000000000..6377751bb978 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_istringstream_string_allocator_delegation/main.cpp @@ -0,0 +1,19 @@ +// N5008 [istringstream.cons]: basic_istringstream(const basic_string &, +// const Allocator &) is, in libstdc++ and libc++, a delegating constructor +// ([class.base.init]/6) of a class with the virtual base basic_ios: its +// target must construct basic_ios and its ios_base ([class.base.init]/7, +// 13.1), whose precision() is 6 ([basic.ios.cons]/4, Table 140). +#include +#include +#include +extern "C" void __CPROVER_assert(bool, const char *); + +int main() +{ + std::string text = "42"; + std::allocator a; + std::istringstream in{text, a}; + __CPROVER_assert(in.precision() == 6, "virtual base constructed"); + __CPROVER_assert(in.precision() == 7, "WRONG (must FAIL)"); + return 0; +} diff --git a/regression/cbmc-cpp/cpp20_istringstream_string_allocator_delegation/test.desc b/regression/cbmc-cpp/cpp20_istringstream_string_allocator_delegation/test.desc new file mode 100644 index 000000000000..aa769045f668 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_istringstream_string_allocator_delegation/test.desc @@ -0,0 +1,20 @@ +KNOWNBUG +main.cpp +--cpp20 --object-bits 12 --unwind 10 --no-unwinding-assertions +^\[main\.assertion\.1\] line \d+ virtual base constructed: SUCCESS$ +^\[main\.assertion\.2\] line \d+ WRONG \(must FAIL\): FAILURE$ +^\*\* 1 of \d+ failed +^VERIFICATION FAILED$ +^EXIT=10$ +^SIGNAL=0$ +-- +^warning: ignoring +-- +N5008 [class.base.init]/6-7: the target of istringstream's delegating +constructor constructs the virtual base basic_ios. It used to be called +as for a base subobject and constructed none, with 42 (libstdc++) or 36 +(libc++) failed properties. +With the MSVC STL the constructor is a constructor template, not a +delegating one; it failed there because the base basic_istream was +constructed as a complete object +(cpp11_base_constructor_with_default_arguments_in_class_with_virtual_base). diff --git a/regression/cbmc-cpp/cpp20_istringstream_string_allocator_delegation/test_libcxx.desc b/regression/cbmc-cpp/cpp20_istringstream_string_allocator_delegation/test_libcxx.desc new file mode 100644 index 000000000000..6273553cd493 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_istringstream_string_allocator_delegation/test_libcxx.desc @@ -0,0 +1,16 @@ +KNOWNBUG libcxx +main.cpp +--cpp20 --stdlib libc++ --object-bits 12 --unwind 10 --no-unwinding-assertions +^\[main\.assertion\.1\] line \d+ virtual base constructed: SUCCESS$ +^\[main\.assertion\.2\] line \d+ WRONG \(must FAIL\): FAILURE$ +^\*\* 1 of \d+ failed +^VERIFICATION FAILED$ +^EXIT=10$ +^SIGNAL=0$ +-- +^warning: ignoring +-- +N5008 [class.base.init]/6-7: the target of istringstream's delegating +constructor constructs the virtual base basic_ios. It used to be called +as for a base subobject and constructed none, with 42 (libstdc++) or 36 +(libc++) failed properties. diff --git a/regression/cbmc-cpp/cpp20_iterator_t_of_pointer_undeduced_declval/main.cpp b/regression/cbmc-cpp/cpp20_iterator_t_of_pointer_undeduced_declval/main.cpp new file mode 100644 index 000000000000..1b0fe052140c --- /dev/null +++ b/regression/cbmc-cpp/cpp20_iterator_t_of_pointer_undeduced_declval/main.cpp @@ -0,0 +1,11 @@ +#include +extern "C" void __CPROVER_assert(bool, const char *); +int main() +{ + int arr[] = {1, 2, 3, 4, 5}; + int sum = 0; + for(auto x : arr | std::views::take(3)) + sum += x; + __CPROVER_assert(sum == 6, "ranges take"); + __CPROVER_assert(sum == 7, "WRONG (must FAIL)"); +} diff --git a/regression/cbmc-cpp/cpp20_iterator_t_of_pointer_undeduced_declval/test.desc b/regression/cbmc-cpp/cpp20_iterator_t_of_pointer_undeduced_declval/test.desc new file mode 100644 index 000000000000..03f41048706c --- /dev/null +++ b/regression/cbmc-cpp/cpp20_iterator_t_of_pointer_undeduced_declval/test.desc @@ -0,0 +1,32 @@ +KNOWNBUG +main.cpp +--cpp20 +^\[main\.assertion\.1\] line \d+ ranges take: SUCCESS$ +^\[main\.assertion\.2\] line \d+ WRONG \(must FAIL\): FAILURE$ +^VERIFICATION FAILED$ +^EXIT=10$ +^SIGNAL=0$ +-- +^CONVERSION ERROR$ +type_traits line 2386: C\+\+ front-end dropped the body +-- +N5008 [range.access.begin], [iterator.concept.readable]: for `int *' +(through ranges::iterator_t of the array's views), libstdc++'s concept +checks name declval<...>() of types such as iterator_t. The front +end instantiates declval's body (type_traits:2386, whose static_assert +must fire only if it is odr-used) with a return type it cannot deduce +("cannot deduce the return type from an operand of undeduced type +'std::ranges::iterator_t'", preceded by "operand of unary * +... is not a pointer" in iterator_concepts.h:635 and a dropped +ranges::__cust_access::__begin) and drops it. The same drops +appear in cpp20_ranges_basic and the descs. cvise reduction +running in /tmp/r163/red/kb_U8. g++ 13 accepts the program. +Pre-existing (fails on bin52). +Round 163m: passes since 1064342dec (deduced-return members of class +template specializations are instantiated on use) and 0a0018a810 (no +compound-requirement fast path); the type_traits:2386 drop is gone. +Fails on bin53. +With the libstdc++ 16 headers `arr | views::take(3)' was rejected (tagged +broken-libstdcxx16); the root cause, +cpp20_concept_disjunction_first_operand_substitution_failure, is fixed, and +the test passes with GCC 16.2.1. diff --git a/regression/cbmc-cpp/cpp20_iterator_traits_category/main.cpp b/regression/cbmc-cpp/cpp20_iterator_traits_category/main.cpp new file mode 100644 index 000000000000..f5cf173f1e33 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_iterator_traits_category/main.cpp @@ -0,0 +1,23 @@ +// C++20 std::iterator_traits<__normal_iterator<...>>::iterator_category. +// +// For a class iterator, std::iterator_traits derives from __iterator_traits, +// whose meaningful definition (under __cpp_lib_concepts) is a *constrained* +// partial specialization selected by its requires-clause +// (__detail::__iter_with_nested_types) per [temp.spec.partial.match] and +// [temp.constr]. That specialization exposes +// iterator_category = typename _Iterator::iterator_category, +// so for std::vector::iterator (a random-access __normal_iterator) the +// category is std::random_access_iterator_tag ([iterator.traits]). +#include +#include +#include + +int main() +{ + typedef std::vector::iterator It; + bool is_rai = std::is_same< + typename std::iterator_traits::iterator_category, + std::random_access_iterator_tag>::value; + __CPROVER_assert(is_rai, "vector iterator category is random_access"); + return 0; +} diff --git a/regression/cbmc-cpp/cpp20_iterator_traits_category/test.desc b/regression/cbmc-cpp/cpp20_iterator_traits_category/test.desc new file mode 100644 index 000000000000..9d7c64b9a78a --- /dev/null +++ b/regression/cbmc-cpp/cpp20_iterator_traits_category/test.desc @@ -0,0 +1,28 @@ +KNOWNBUG +main.cpp +--cpp20 +^\[main\.assertion\.1\] line \d+ vector iterator category is random_access: SUCCESS$ +^VERIFICATION SUCCESSFUL$ +^EXIT=0$ +^SIGNAL=0$ +-- +^warning: ignoring +^CONVERSION ERROR$ +dropped the body +-- +C++20 std::iterator_traits::iterator>::iterator_category, end +to end via the constrained __iterator_traits machinery. + +Was KNOWNBUG, then FLAKY (run-to-run): libstdc++'s __iterator_traits +member alias __cat has three partial specializations with the SAME +argument pattern differing only by requires-clauses that form a +subsumption chain (__cpp17_input_iterator < __cpp17_fwd_iterator < +__cpp17_randacc_iterator conjunctions); for a random-access iterator all +three are satisfied and N5008 [temp.spec.partial.match]/2 + +[temp.constr.order] mandate the most-constrained one. The tie-break used +a counting heuristic that fell through to first-seen in the +pointer-ordered id_set (std::set), so the selected category was +ASLR-dependent (bidirectional on unlucky runs; deterministic FAILURE +under `setarch -R`). Fixed by constraint-subsumption ordering +(template_constraint_strictly_subsumes) with a deterministic symbol-name +fallback for incomparable constraints. diff --git a/regression/cbmc-cpp/cpp20_lambda_closure_in_variable_template_specialization/main.cpp b/regression/cbmc-cpp/cpp20_lambda_closure_in_variable_template_specialization/main.cpp new file mode 100644 index 000000000000..234ee37a5f2f --- /dev/null +++ b/regression/cbmc-cpp/cpp20_lambda_closure_in_variable_template_specialization/main.cpp @@ -0,0 +1,30 @@ +extern "C" void __CPROVER_assert(bool, const char *); +// N5008 [expr.prim.lambda.closure]/1, /4: a lambda in a variable template's +// initializer has a closure type per specialization; its function call +// operator is defined in that specialization, here fits::U> +// instantiated from a static member of base (libc++'s +// __fits_in_tail_padding in ) +template +inline constexpr bool fits = []() +{ + struct x + { + F f; + }; + return sizeof(x) == sizeof(F); +}(); +template +struct base +{ + struct U + { + T t; + }; + static constexpr bool tail = fits; +}; +int main() +{ + __CPROVER_assert(base::tail, "closure in variable template"); + __CPROVER_assert(!base::tail, "WRONG (must FAIL)"); + return 0; +} diff --git a/regression/cbmc-cpp/cpp20_lambda_closure_in_variable_template_specialization/test.desc b/regression/cbmc-cpp/cpp20_lambda_closure_in_variable_template_specialization/test.desc new file mode 100644 index 000000000000..53b3bacd0664 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_lambda_closure_in_variable_template_specialization/test.desc @@ -0,0 +1,17 @@ +KNOWNBUG +main.cpp +--cpp20 +^\[main\.assertion\.1\] line \d+ closure in variable template: SUCCESS$ +^\[main\.assertion\.2\] line \d+ WRONG \(must FAIL\): FAILURE$ +^VERIFICATION FAILED$ +^EXIT=10$ +^SIGNAL=0$ +-- +^warning: ignoring +^CONVERSION ERROR$ +dropped the body +-- +The closure type's name was computed without the scope suffix of the +variable template specialization, so it was not found; its members were +then converted when base completed, without F bound, and +operator()'s body was dropped. diff --git a/regression/cbmc-cpp/cpp20_lambda_pack_capture/main.cpp b/regression/cbmc-cpp/cpp20_lambda_pack_capture/main.cpp new file mode 100644 index 000000000000..b07616078301 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_lambda_pack_capture/main.cpp @@ -0,0 +1,12 @@ +// C++20 lambda init-capture with pack expansion +template +auto make_sum_lambda(Args... args) +{ + return [... captured = args]() { return (captured + ...); }; +} +int main() +{ + auto f = make_sum_lambda(1, 2, 3); + __CPROVER_assert(f() == 6, "init capture pack"); + return 0; +} diff --git a/regression/cbmc-cpp/cpp20_lambda_pack_capture/test.desc b/regression/cbmc-cpp/cpp20_lambda_pack_capture/test.desc new file mode 100644 index 000000000000..436a3050a1fd --- /dev/null +++ b/regression/cbmc-cpp/cpp20_lambda_pack_capture/test.desc @@ -0,0 +1,10 @@ +KNOWNBUG +main.cpp +--cpp20 +^VERIFICATION SUCCESSFUL$ +^EXIT=0$ +^SIGNAL=0$ +-- +dropped the body +-- +C++20 lambda init-capture with pack expansion diff --git a/regression/cbmc-cpp/cpp20_lambda_template/main.cpp b/regression/cbmc-cpp/cpp20_lambda_template/main.cpp new file mode 100644 index 000000000000..dcf74857b188 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_lambda_template/main.cpp @@ -0,0 +1,6 @@ +// C++20 template lambda +int main() +{ + auto f = [](T x) { return x + 1; }; + __CPROVER_assert(f(41) == 42, "lambda template"); +} diff --git a/regression/cbmc-cpp/cpp20_lambda_template/test.desc b/regression/cbmc-cpp/cpp20_lambda_template/test.desc new file mode 100644 index 000000000000..364d916d224e --- /dev/null +++ b/regression/cbmc-cpp/cpp20_lambda_template/test.desc @@ -0,0 +1,9 @@ +KNOWNBUG +main.cpp +--cpp20 +^VERIFICATION SUCCESSFUL$ +^EXIT=0$ +^SIGNAL=0$ +-- +dropped the body +-- diff --git a/regression/cbmc-cpp/cpp20_lambda_unevaluated/main.cpp b/regression/cbmc-cpp/cpp20_lambda_unevaluated/main.cpp new file mode 100644 index 000000000000..da8f9e1dc233 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_lambda_unevaluated/main.cpp @@ -0,0 +1,11 @@ +// C++20: lambda in unevaluated context (decltype) +#include + +using F = decltype([](int x) { return x + 1; }); + +int main() +{ + F f; + int r = f(41); + assert(r == 42); +} diff --git a/regression/cbmc-cpp/cpp20_lambda_unevaluated/test.desc b/regression/cbmc-cpp/cpp20_lambda_unevaluated/test.desc new file mode 100644 index 000000000000..9290991636cd --- /dev/null +++ b/regression/cbmc-cpp/cpp20_lambda_unevaluated/test.desc @@ -0,0 +1,10 @@ +KNOWNBUG +main.cpp +--cpp20 +^VERIFICATION SUCCESSFUL$ +^EXIT=0$ +^SIGNAL=0$ +-- +dropped the body +-- +Lambda in unevaluated context (decltype): using F = decltype([]{}); diff --git a/regression/cbmc-cpp/cpp20_libcxx20_initializer_list/main.cpp b/regression/cbmc-cpp/cpp20_libcxx20_initializer_list/main.cpp new file mode 100644 index 000000000000..179908a3efab --- /dev/null +++ b/regression/cbmc-cpp/cpp20_libcxx20_initializer_list/main.cpp @@ -0,0 +1,8 @@ +// libc++-20 C++20 brace initialization with initializer_list +#include +int main() +{ + std::vector v{1, 2, 3}; + __CPROVER_assert(v.size() == 3, "size"); + return 0; +} diff --git a/regression/cbmc-cpp/cpp20_libcxx20_initializer_list/test.desc b/regression/cbmc-cpp/cpp20_libcxx20_initializer_list/test.desc new file mode 100644 index 000000000000..3ba8c207363e --- /dev/null +++ b/regression/cbmc-cpp/cpp20_libcxx20_initializer_list/test.desc @@ -0,0 +1,49 @@ +KNOWNBUG libcxx +main.cpp +--cpp20 --stdlib libc++ --unwind 5 --no-unwinding-assertions --object-bits 12 +^VERIFICATION +^EXIT=(0|10)$ +^SIGNAL=0$ +-- +-- +C++20 brace initialization of std::vector with initializer_list +fails with 'struct nil is still incomplete'. This is a pre-existing +CBMC limitation affecting both libc++-18 and libc++-20. +Tagged KNOWNBUG 2026-07-23 (first full libc++ suite run): +C++20 concepts: substitution failure inside a concept-id's argument +must yield an unsatisfied constraint ([temp.constr.atomic]/3), not a +hard 'no match for same_as'; minimal WRONG-CODE root KNOWNBUG +cpp20_constraint_substitution_failure. cpp20_ranges_basic +additionally aborts a unary-operand invariant (std_expr.h:380). +Update 2026-07-24: past the same_as front-end failure +([temp.constr.atomic]/3 atom classification); residual: semantic FAILUREs. +The same_as front-end failure is the requires-clause concept-template-id +parse gap, captured minimally in +cpp20_requires_clause_concept_template_id. +Update 2026-07-28: same vector-internal-pointer family as +cpp20_vector_basic_libcxx (see its note); header-free reduction +blocked on the typecheck_method_application crash. +Masking crash isolated: cpp20_extern_template_copy_ctor_abort. +Update 2026-07-30: the "masking crash" on preprocessed sources was a +MODE artifact (clang builtins lex only under --stdlib libc++); re-fed +preprocessed source with the right flags reproduces the SEMANTIC +failure directly, so header-free reduction is unblocked. +Update 2026-07-30 (round 4): the bodyless std::move root is FIXED +(cpp20_bodyless_std_move is CORE); the library test still fails on +further layers (__end_/__begin_ still unconstrained) -- re-reduce +from the current state next round. +Update 2026-08-01 (round 5): four more layers fixed -- auto-return +static members of class-template instances (eager deduction), decltype +of indirection is T& ([dcl.type.decltype]/1.5), explicit template args +survive deduction ([temp.arg.explicit]/7), C++20 parenthesized +aggregate init/CTAD (make_pair). Next open root: +cpp20_recursive_member_alias_base (_Or/_And metaprogram bases drop). +Round-11 (2026-08-04): same_as wall FIXED; converts fully; runs BMC. +Next layer: size assertion FAILS (wrong-code, needs reduction with +value-loss criterion). +Round-23 (2026-08-08): FIXED — the wrong-code root was the constexpr +~_ConstructTransaction being marked as a fold candidate (is_macro), +so its body (committing __end_) was never emitted and every +initializer-list vector came out EMPTY. [dcl.constexpr]; destructors +excluded from the marking. + diff --git a/regression/cbmc-cpp/cpp20_libcxx20_vector/main.cpp b/regression/cbmc-cpp/cpp20_libcxx20_vector/main.cpp new file mode 100644 index 000000000000..7be7a4a631f7 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_libcxx20_vector/main.cpp @@ -0,0 +1,11 @@ +// libc++-20 C++20 vector test +#include +int main() +{ + std::vector v; + v.push_back(1); + v.push_back(2); + v.push_back(3); + __CPROVER_assert(v.size() == 3, "size"); + return 0; +} diff --git a/regression/cbmc-cpp/cpp20_libcxx20_vector/test.desc b/regression/cbmc-cpp/cpp20_libcxx20_vector/test.desc new file mode 100644 index 000000000000..878de1e92653 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_libcxx20_vector/test.desc @@ -0,0 +1,10 @@ +KNOWNBUG libcxx +main.cpp +--cpp20 --stdlib libc++ --unwind 5 --no-unwinding-assertions --object-bits 12 +^\[main\.assertion\.1\] line \d+ size: SUCCESS$ +^VERIFICATION SUCCESSFUL$ +^EXIT=0$ +^SIGNAL=0$ +-- +-- +History + fix chain: see cpp20_vector_basic_libcxx. diff --git a/regression/cbmc-cpp/cpp20_libcxx_header_drops/bind_back.cpp b/regression/cbmc-cpp/cpp20_libcxx_header_drops/bind_back.cpp new file mode 100644 index 000000000000..e806ea16b8c8 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_libcxx_header_drops/bind_back.cpp @@ -0,0 +1,17 @@ +#include <__functional/bind_back.h> +extern "C" void __CPROVER_assert(bool, const char *); +struct at +{ + int operator()(int (&a)[5], int n) const + { + return a[n]; + } +}; +int main() +{ + int arr[] = {1, 2, 3, 4, 5}; + auto c = std::__bind_back(at{}, 2); + __CPROVER_assert(c(arr) == 3, "lvalue"); + __CPROVER_assert(std::__bind_back(at{}, 1)(arr) == 2, "rvalue"); + __CPROVER_assert(false, "WRONG (must FAIL)"); +} diff --git a/regression/cbmc-cpp/cpp20_libcxx_header_drops/chrono.cpp b/regression/cbmc-cpp/cpp20_libcxx_header_drops/chrono.cpp new file mode 100644 index 000000000000..b4b73226109e --- /dev/null +++ b/regression/cbmc-cpp/cpp20_libcxx_header_drops/chrono.cpp @@ -0,0 +1,8 @@ +#include +extern "C" void __CPROVER_assert(bool, const char *); +int main() +{ + std::chrono::seconds s{3}; + __CPROVER_assert(s.count() == 3, "duration"); + __CPROVER_assert(false, "WRONG (must FAIL)"); +} diff --git a/regression/cbmc-cpp/cpp20_libcxx_header_drops/functional.cpp b/regression/cbmc-cpp/cpp20_libcxx_header_drops/functional.cpp new file mode 100644 index 000000000000..cbb51143cbc4 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_libcxx_header_drops/functional.cpp @@ -0,0 +1,8 @@ +#include +extern "C" void __CPROVER_assert(bool, const char *); +int main() +{ + std::function f = [](int x) { return x + 1; }; + __CPROVER_assert(f(1) == 2, "function"); + __CPROVER_assert(false, "WRONG (must FAIL)"); +} diff --git a/regression/cbmc-cpp/cpp20_libcxx_header_drops/ranges_find.cpp b/regression/cbmc-cpp/cpp20_libcxx_header_drops/ranges_find.cpp new file mode 100644 index 000000000000..786080c55d20 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_libcxx_header_drops/ranges_find.cpp @@ -0,0 +1,9 @@ +#include +#include +extern "C" void __CPROVER_assert(bool, const char *); +int main() +{ + int a[] = {3, 1, 2}; + __CPROVER_assert(*std::ranges::find(a, 1) == 1, "find"); + __CPROVER_assert(false, "WRONG (must FAIL)"); +} diff --git a/regression/cbmc-cpp/cpp20_libcxx_header_drops/sort.cpp b/regression/cbmc-cpp/cpp20_libcxx_header_drops/sort.cpp new file mode 100644 index 000000000000..847fd2dc5155 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_libcxx_header_drops/sort.cpp @@ -0,0 +1,9 @@ +#include +extern "C" void __CPROVER_assert(bool, const char *); +int main() +{ + int a[3] = {3, 1, 2}; + std::sort(a, a + 3); + __CPROVER_assert(a[0] == 1 && a[2] == 3, "sorted"); + __CPROVER_assert(false, "WRONG (must FAIL)"); +} diff --git a/regression/cbmc-cpp/cpp20_libcxx_header_drops/sort_types.cpp b/regression/cbmc-cpp/cpp20_libcxx_header_drops/sort_types.cpp new file mode 100644 index 000000000000..13d115e13c96 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_libcxx_header_drops/sort_types.cpp @@ -0,0 +1,23 @@ +// N5008 [sort]/3: sort leaves [first, last) in non-decreasing order +// (libc++ defines its std::__sort for these types only in libc++.so) +#include +#include +extern "C" void __CPROVER_assert(bool, const char *); +int main() +{ + double d[4] = {2.5, -1.0, 2.5, 0.0}; + std::sort(d, d + 4); + __CPROVER_assert( + d[0] == -1.0 && d[1] == 0.0 && d[2] == 2.5 && d[3] == 2.5, "double"); + unsigned u[3] = {7u, 0u, 4294967295u}; + std::sort(u, u + 3, std::less()); + __CPROVER_assert(u[0] == 0u && u[2] == 4294967295u, "unsigned, less"); + long e[1] = {5}; + std::sort(e, e + 1); + std::sort(e, e); + __CPROVER_assert(e[0] == 5, "one element and empty ranges"); + char c[3] = {'c', 'a', 'b'}; + std::sort(c, c + 3); + __CPROVER_assert(c[0] == 'a' && c[1] == 'b' && c[2] == 'c', "char"); + __CPROVER_assert(d[0] == 0.0, "WRONG (must FAIL)"); +} diff --git a/regression/cbmc-cpp/cpp20_libcxx_header_drops/sstream.cpp b/regression/cbmc-cpp/cpp20_libcxx_header_drops/sstream.cpp new file mode 100644 index 000000000000..4cfa90bbf480 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_libcxx_header_drops/sstream.cpp @@ -0,0 +1,8 @@ +#include +extern "C" void __CPROVER_assert(bool, const char *); +int main() +{ + std::ostringstream o; + __CPROVER_assert(o.good(), "constructed"); + __CPROVER_assert(false, "WRONG (must FAIL)"); +} diff --git a/regression/cbmc-cpp/cpp20_libcxx_header_drops/sstream_insert.cpp b/regression/cbmc-cpp/cpp20_libcxx_header_drops/sstream_insert.cpp new file mode 100644 index 000000000000..b5d9237759f6 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_libcxx_header_drops/sstream_insert.cpp @@ -0,0 +1,11 @@ +#include +extern "C" void __CPROVER_assert(bool, const char *); +void insert(std::ostringstream &o) +{ + o << "ab"; +} +int main() +{ + __CPROVER_assert(true, "converted"); + __CPROVER_assert(false, "WRONG (must FAIL)"); +} diff --git a/regression/cbmc-cpp/cpp20_libcxx_header_drops/stop_token.cpp b/regression/cbmc-cpp/cpp20_libcxx_header_drops/stop_token.cpp new file mode 100644 index 000000000000..0d6f001d7d7e --- /dev/null +++ b/regression/cbmc-cpp/cpp20_libcxx_header_drops/stop_token.cpp @@ -0,0 +1,9 @@ +#include +extern "C" void __CPROVER_assert(bool, const char *); +int main() +{ + // libc++ 18 declares std::stop_source only with -fexperimental-library; + // the header's inline functions are type-checked regardless + __CPROVER_assert(true, "header"); + __CPROVER_assert(false, "WRONG (must FAIL)"); +} diff --git a/regression/cbmc-cpp/cpp20_libcxx_header_drops/string_view_find.cpp b/regression/cbmc-cpp/cpp20_libcxx_header_drops/string_view_find.cpp new file mode 100644 index 000000000000..2edcb5ed93ac --- /dev/null +++ b/regression/cbmc-cpp/cpp20_libcxx_header_drops/string_view_find.cpp @@ -0,0 +1,9 @@ +#include + +extern "C" void __CPROVER_assert(bool, const char *); +int main() +{ + std::string_view s = "hello"; + __CPROVER_assert(s.find(0x6c) == 2, "find"); + __CPROVER_assert(false, "WRONG (must FAIL)"); +} diff --git a/regression/cbmc-cpp/cpp20_libcxx_header_drops/test_bind_back.desc b/regression/cbmc-cpp/cpp20_libcxx_header_drops/test_bind_back.desc new file mode 100644 index 000000000000..19d60350e44b --- /dev/null +++ b/regression/cbmc-cpp/cpp20_libcxx_header_drops/test_bind_back.desc @@ -0,0 +1,19 @@ +KNOWNBUG libcxx +bind_back.cpp +--cpp20 --stdlib libc++ --object-bits 12 +^\[main\.assertion\.1\] line \d+ lvalue: SUCCESS$ +^\[main\.assertion\.2\] line \d+ rvalue: SUCCESS$ +^\[main\.assertion\.3\] line \d+ WRONG \(must FAIL\): FAILURE$ +^VERIFICATION FAILED$ +^EXIT=10$ +^SIGNAL=0$ +-- +^warning: ignoring +^CONVERSION ERROR$ +dropped the body of system-header function +-- +libc++ (LLVM 18) std::__bind_back (the core of std::views::take). Checking +tuple's constructor constraints used to instantiate the definition of a +constexpr constructor template, and through it two __tuple_impl bodies +(tuple:488) that are ill-formed for those arguments and were dropped +(cpp11_tuple_converting_constructor_spurious_instantiation). diff --git a/regression/cbmc-cpp/cpp20_libcxx_header_drops/test_chrono.desc b/regression/cbmc-cpp/cpp20_libcxx_header_drops/test_chrono.desc new file mode 100644 index 000000000000..ba3997fc1213 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_libcxx_header_drops/test_chrono.desc @@ -0,0 +1,20 @@ +KNOWNBUG libcxx +chrono.cpp +--cpp20 --stdlib libc++ --object-bits 12 +^\[main\.assertion\.1\] line \d+ duration: SUCCESS$ +^\[main\.assertion\.2\] line \d+ WRONG \(must FAIL\): FAILURE$ +^VERIFICATION FAILED$ +^EXIT=10$ +^SIGNAL=0$ +-- +^warning: ignoring +^CONVERSION ERROR$ +dropped the body of system-header function +could not fully type-check +system-header declaration +-- +libc++ (LLVM 18) converts without dropped bodies. Fixed: the +year_month_day_last members (cpp_member_function_named_like_earlier_used_ +class) and, in round 163w, year_month_day.h:212 operator local_days +(cpp11_direct_init_through_explicit_conversion_function). clang++ 18 +-stdlib=libc++ accepts this program, and it fails only its WRONG assertion. diff --git a/regression/cbmc-cpp/cpp20_libcxx_header_drops/test_functional.desc b/regression/cbmc-cpp/cpp20_libcxx_header_drops/test_functional.desc new file mode 100644 index 000000000000..cd14aaf00653 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_libcxx_header_drops/test_functional.desc @@ -0,0 +1,26 @@ +KNOWNBUG libcxx +functional.cpp +--cpp20 --stdlib libc++ --object-bits 12 +^\[main\.assertion\.1\] line \d+ function: SUCCESS$ +^\[main\.assertion\.2\] line \d+ WRONG \(must FAIL\): FAILURE$ +^VERIFICATION FAILED$ +^EXIT=10$ +^SIGNAL=0$ +-- +^warning: ignoring +^CONVERSION ERROR$ +dropped the body of system-header function +could not fully type-check +system-header declaration +-- +libc++ (LLVM 18) : std::function holding a lambda +returned a nondeterministic value. Fixed: the virtual call of +__func::operator() (cpp11_virtual_override_with_rvalue_reference_parameter), +and the __tuple_impl constructor bodies dropped because overload resolution +for __compressed_pair_elem's constructor also offered the specialization +instantiated for the other __alloc_func constructor (tuple) for a +tuple<> argument, whose conversion trial instantiated tuple's +constructor template with tuple<> ([temp.over]/1, +cpp11_deduction_fails_for_mismatched_template_argument_count). clang++ 18 +-stdlib=libc++ accepts this program, and it fails only its WRONG +assertion. diff --git a/regression/cbmc-cpp/cpp20_libcxx_header_drops/test_ranges_find.desc b/regression/cbmc-cpp/cpp20_libcxx_header_drops/test_ranges_find.desc new file mode 100644 index 000000000000..3410c06cdea1 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_libcxx_header_drops/test_ranges_find.desc @@ -0,0 +1,18 @@ +KNOWNBUG libcxx +ranges_find.cpp +--cpp20 --stdlib libc++ --object-bits 12 --unwind 8 +^\[main\.assertion\.1\] line \d+ find: SUCCESS$ +^\[main\.assertion\.2\] line \d+ WRONG \(must FAIL\): FAILURE$ +^VERIFICATION FAILED$ +^EXIT=10$ +^SIGNAL=0$ +-- +^warning: ignoring +^CONVERSION ERROR$ +dropped the body of system-header function +-- +libc++ (LLVM 18) std::ranges::find on an int array. With included +CBMC took int * for a segmented iterator: the join_view specialization of +__segmented_iterator_traits matched although its requires-clause cannot be +substituted (N5008 [temp.constr.atomic]/3), so the call went to +__find_segment_if, whose body was dropped. diff --git a/regression/cbmc-cpp/cpp20_libcxx_header_drops/test_sort.desc b/regression/cbmc-cpp/cpp20_libcxx_header_drops/test_sort.desc new file mode 100644 index 000000000000..a7f8429103a7 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_libcxx_header_drops/test_sort.desc @@ -0,0 +1,20 @@ +KNOWNBUG libcxx +sort.cpp +--cpp17 --stdlib libc++ --unwind 8 --object-bits 12 +^\[main\.assertion\.1\] line \d+ sorted: SUCCESS$ +^\[main\.assertion\.2\] line \d+ WRONG \(must FAIL\): FAILURE$ +^VERIFICATION FAILED$ +^EXIT=10$ +^SIGNAL=0$ +-- +^warning: ignoring +^CONVERSION ERROR$ +no body for callee +-- +libc++ (LLVM 18) : std::sort on int called +std::__sort<__less &, int *>, which libc++ declares `extern +template' (sort.h:905) and defines only in libc++.so (src/algorithm.cpp; +the header has only the declaration, sort.h:892), so it had no body. +Fixed (round 163w): provide_stdlib_bodies models it (test_sort_types.desc). +clang++ 18 -stdlib=libc++ accepts this program, and it fails only its +WRONG assertion. diff --git a/regression/cbmc-cpp/cpp20_libcxx_header_drops/test_sort_types.desc b/regression/cbmc-cpp/cpp20_libcxx_header_drops/test_sort_types.desc new file mode 100644 index 000000000000..139606ad08bf --- /dev/null +++ b/regression/cbmc-cpp/cpp20_libcxx_header_drops/test_sort_types.desc @@ -0,0 +1,22 @@ +KNOWNBUG libcxx +sort_types.cpp +--cpp20 --stdlib libc++ --unwind 8 --object-bits 12 +^\[main\.assertion\.1\] line \d+ double: SUCCESS$ +^\[main\.assertion\.2\] line \d+ unsigned, less: SUCCESS$ +^\[main\.assertion\.3\] line \d+ one element and empty ranges: SUCCESS$ +^\[main\.assertion\.4\] line \d+ char: SUCCESS$ +^\[main\.assertion\.5\] line \d+ WRONG \(must FAIL\): FAILURE$ +^VERIFICATION FAILED$ +^EXIT=10$ +^SIGNAL=0$ +-- +^warning: ignoring +^CONVERSION ERROR$ +no body for callee +-- +N5008 [sort]/3: libc++ 18 declares std::__sort<__less &, T *> for +the arithmetic types `extern template' and defines the template only in +libc++.so (src/algorithm.cpp), so these calls had no body (bin53). +provide_stdlib_bodies models it as an insertion sort with `<'. clang++ +18 -stdlib=libc++ accepts this program, and it fails only its WRONG +assertion. diff --git a/regression/cbmc-cpp/cpp20_libcxx_header_drops/test_sstream.desc b/regression/cbmc-cpp/cpp20_libcxx_header_drops/test_sstream.desc new file mode 100644 index 000000000000..bffa9097c5d5 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_libcxx_header_drops/test_sstream.desc @@ -0,0 +1,23 @@ +KNOWNBUG libcxx +sstream.cpp +--cpp11 --stdlib libc++ --object-bits 12 +^\[main\.assertion\.1\] line \d+ constructed: SUCCESS$ +^\[main\.assertion\.2\] line \d+ WRONG \(must FAIL\): FAILURE$ +^VERIFICATION FAILED$ +^EXIT=10$ +^SIGNAL=0$ +-- +^warning: ignoring +^CONVERSION ERROR$ +dropped the body of system-header function +no body for callee +-- +libc++ (LLVM 18) : basic_ostringstream's constructors and +destructor converted with no dropped body after +cpp_constructor_overload_resolution_with_virtual_base (they were dropped: +`basic_ostream<_CharT, _Traits>(&__sb_)' "did not uniquely resolve", and the +destructor passed the internal @most_derived flag against a real +parameter). o.good() is checked since ios_base::init and locale's +constructor (defined in libc++.so) are modelled +(cpp17_libcxx_ostringstream_state). clang++ 18 -stdlib=libc++ accepts this +program. diff --git a/regression/cbmc-cpp/cpp20_libcxx_header_drops/test_sstream_insert.desc b/regression/cbmc-cpp/cpp20_libcxx_header_drops/test_sstream_insert.desc new file mode 100644 index 000000000000..24637fa09b16 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_libcxx_header_drops/test_sstream_insert.desc @@ -0,0 +1,20 @@ +KNOWNBUG libcxx +sstream_insert.cpp +--cpp20 --stdlib libc++ --object-bits 12 +^\[main\.assertion\.1\] line \d+ converted: SUCCESS$ +^\[main\.assertion\.2\] line \d+ WRONG \(must FAIL\): FAILURE$ +^VERIFICATION FAILED$ +^EXIT=10$ +^SIGNAL=0$ +-- +^warning: ignoring +^CONVERSION ERROR$ +dropped the body of system-header function +-- +libc++ (LLVM 18) : converting `o << "ab"' dropped the __format +functions (root cause +cpp20_requires_expression_parameter_pack_of_differing_types) and +basic_streambuf>::xsgetn / xsputn, a bogus +instance (cpp_deduction_failure_does_not_instantiate_pattern); both fixed. +clang++ 18 -stdlib=libc++ accepts this program, and it fails only its WRONG +assertion. diff --git a/regression/cbmc-cpp/cpp20_libcxx_header_drops/test_stop_token.desc b/regression/cbmc-cpp/cpp20_libcxx_header_drops/test_stop_token.desc new file mode 100644 index 000000000000..8b7a76f8135f --- /dev/null +++ b/regression/cbmc-cpp/cpp20_libcxx_header_drops/test_stop_token.desc @@ -0,0 +1,21 @@ +KNOWNBUG libcxx +stop_token.cpp +--cpp20 --stdlib libc++ +^\[main\.assertion\.1\] line \d+ header: SUCCESS$ +^\[main\.assertion\.2\] line \d+ WRONG \(must FAIL\): FAILURE$ +^VERIFICATION FAILED$ +^EXIT=10$ +^SIGNAL=0$ +-- +^warning: ignoring +^CONVERSION ERROR$ +dropped the body of system-header function +could not fully type-check +system-header declaration +-- +libc++ (LLVM 18) : __stop_token/stop_state.h:33 +__stop_callback_base::__invoke (cpp11_alias_declaration_of_function_type) +and 140 __stop_state::__add_callback +(cpp14_deduced_return_type_bool_literal_and_comparison) were dropped +(bin53); both are fixed. clang++ 18 -stdlib=libc++ accepts this program, +and it fails only its WRONG assertion. diff --git a/regression/cbmc-cpp/cpp20_libcxx_header_drops/test_string_view_find.desc b/regression/cbmc-cpp/cpp20_libcxx_header_drops/test_string_view_find.desc new file mode 100644 index 000000000000..d283cf022181 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_libcxx_header_drops/test_string_view_find.desc @@ -0,0 +1,17 @@ +KNOWNBUG libcxx +string_view_find.cpp +--cpp20 --stdlib libc++ --object-bits 12 +^\[main\.assertion\.1\] line \d+ find: SUCCESS$ +^\[main\.assertion\.2\] line \d+ WRONG \(must FAIL\): FAILURE$ +^VERIFICATION FAILED$ +^EXIT=10$ +^SIGNAL=0$ +-- +^warning: ignoring +^CONVERSION ERROR$ +dropped the body of system-header function +-- +libc++ (LLVM 18) std::string_view::find(char): __constexpr_memchr static_asserts clang's __is_trivially_equality_comparable and +calls __builtin_char_memchr; both were unknown, so its body was dropped +and find returned nondet. diff --git a/regression/cbmc-cpp/cpp20_libcxx_header_drops/test_tuple_convert.desc b/regression/cbmc-cpp/cpp20_libcxx_header_drops/test_tuple_convert.desc new file mode 100644 index 000000000000..b89858c79028 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_libcxx_header_drops/test_tuple_convert.desc @@ -0,0 +1,20 @@ +KNOWNBUG libcxx +tuple_convert.cpp +--cpp20 --stdlib libc++ +^\[main\.assertion\.1\] line \d+ converted: SUCCESS$ +^\[main\.assertion\.2\] line \d+ from forward_as_tuple: SUCCESS$ +^\[main\.assertion\.3\] line \d+ WRONG \(must FAIL\): FAILURE$ +^VERIFICATION FAILED$ +^EXIT=10$ +^SIGNAL=0$ +-- +^warning: ignoring +^CONVERSION ERROR$ +dropped the body of system-header function +-- +libc++ (LLVM 18) : `std::tuple c(std::forward_as_tuple(3))'. +tuple's element-wise constructor tuple(_Up &&...) is removed by its +_EnableUTypesCtor<_Up...> constraint (N5008 [temp.variadic]/16: with one +deduced element, _Up... in the default's template-argument list used to +expand to no argument, so the constraint held and __tuple_impl's body for +it, tuple:469, was dropped). diff --git a/regression/cbmc-cpp/cpp20_libcxx_header_drops/test_unordered_set.desc b/regression/cbmc-cpp/cpp20_libcxx_header_drops/test_unordered_set.desc new file mode 100644 index 000000000000..a10d3418631b --- /dev/null +++ b/regression/cbmc-cpp/cpp20_libcxx_header_drops/test_unordered_set.desc @@ -0,0 +1,20 @@ +KNOWNBUG libcxx +unordered_set.cpp +--cpp20 --stdlib libc++ --object-bits 12 --unwind 12 +^\[main\.assertion\.1\] line \d+ count: SUCCESS$ +^\[main\.assertion\.2\] line \d+ size: SUCCESS$ +^\[main\.assertion\.3\] line \d+ WRONG \(must FAIL\): FAILURE$ +^\*\* 1 of \d+ failed +^VERIFICATION FAILED$ +^EXIT=10$ +^SIGNAL=0$ +-- +^warning: ignoring +^CONVERSION ERROR$ +dropped the body of system-header function +no body for callee +-- +libc++ (LLVM 18) std::unordered_set: insert used __construct_node_hash +with an empty pack (cpp11_out_of_class_member_template_empty_pack) and count +the const/non-const __hash_table::find pair +(cpp11_const_overloaded_member_templates). diff --git a/regression/cbmc-cpp/cpp20_libcxx_header_drops/test_views_filter.desc b/regression/cbmc-cpp/cpp20_libcxx_header_drops/test_views_filter.desc new file mode 100644 index 000000000000..aa4cd2ce0b8d --- /dev/null +++ b/regression/cbmc-cpp/cpp20_libcxx_header_drops/test_views_filter.desc @@ -0,0 +1,15 @@ +KNOWNBUG libcxx +views_filter.cpp +--cpp20 --stdlib libc++ --object-bits 12 --unwind 8 +^\[main\.assertion\.1\] line \d+ filter: SUCCESS$ +^\[main\.assertion\.2\] line \d+ WRONG \(must FAIL\): FAILURE$ +^VERIFICATION FAILED$ +^EXIT=10$ +^SIGNAL=0$ +-- +^warning: ignoring +^CONVERSION ERROR$ +dropped the body of system-header function +-- +libc++ (LLVM 18) std::views::filter: the same __tuple_impl layer as +test_bind_back (cpp11_tuple_converting_constructor_spurious_instantiation). diff --git a/regression/cbmc-cpp/cpp20_libcxx_header_drops/test_views_iota.desc b/regression/cbmc-cpp/cpp20_libcxx_header_drops/test_views_iota.desc new file mode 100644 index 000000000000..740a70bf3121 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_libcxx_header_drops/test_views_iota.desc @@ -0,0 +1,19 @@ +KNOWNBUG libcxx +views_iota.cpp +--cpp20 --stdlib libc++ --object-bits 12 --unwind 8 +^\[main\.assertion\.1\] line \d+ iota: SUCCESS$ +^\[main\.assertion\.2\] line \d+ WRONG \(must FAIL\): FAILURE$ +^VERIFICATION FAILED$ +^EXIT=10$ +^SIGNAL=0$ +-- +^warning: ignoring +^CONVERSION ERROR$ +dropped the body of system-header function +-- +libc++ (LLVM 18) std::views::iota. The layers that broke it: iterator_concept +from derived_from on incomplete classes +(cpp11_conversion_between_incomplete_classes) and __make_signed's result +type (cpp20_builtin_make_signed_corresponding_type), which made the +__iterator constructor lose its body. clang++ 18 -stdlib=libc++ accepts this +program, and it fails only its WRONG assertion. diff --git a/regression/cbmc-cpp/cpp20_libcxx_header_drops/test_views_transform.desc b/regression/cbmc-cpp/cpp20_libcxx_header_drops/test_views_transform.desc new file mode 100644 index 000000000000..222fc5d2e8fa --- /dev/null +++ b/regression/cbmc-cpp/cpp20_libcxx_header_drops/test_views_transform.desc @@ -0,0 +1,21 @@ +KNOWNBUG libcxx +views_transform.cpp +--cpp20 --stdlib libc++ --object-bits 12 --unwind 8 +^\[main\.assertion\.1\] line \d+ transform: SUCCESS$ +^\[main\.assertion\.2\] line \d+ WRONG \(must FAIL\): FAILURE$ +^VERIFICATION FAILED$ +^EXIT=10$ +^SIGNAL=0$ +-- +^warning: ignoring +^CONVERSION ERROR$ +dropped the body of system-header function +-- +libc++ (LLVM 18) std::views::transform. The layers that broke it: the +out-of-class member class template __iterator of the constrained +transform_view (cpp20_member_class_template_of_constrained_class_template), +its constrained converting constructor +(cpp20_constrained_converting_constructor_of_class_template) and the two +end() overloads that differ only in their requires-clauses +(cpp20_same_signature_members_differing_in_constraints). clang++ 18 +-stdlib=libc++ accepts this program, and it fails only its WRONG assertion. diff --git a/regression/cbmc-cpp/cpp20_libcxx_header_drops/test_visit.desc b/regression/cbmc-cpp/cpp20_libcxx_header_drops/test_visit.desc new file mode 100644 index 000000000000..3e8173cf7170 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_libcxx_header_drops/test_visit.desc @@ -0,0 +1,28 @@ +KNOWNBUG libcxx +visit.cpp +--cpp20 --stdlib libc++ --object-bits 12 +^\[main\.assertion\.1\] line \d+ visit: SUCCESS$ +^\[main\.assertion\.2\] line \d+ WRONG \(must FAIL\): FAILURE$ +^VERIFICATION FAILED$ +^EXIT=10$ +^SIGNAL=0$ +-- +^warning: ignoring +^CONVERSION ERROR$ +dropped the body of system-header function +-- +libc++ (LLVM 18) std::visit(F, variant). The layers that dropped +its body: the declaration's default template argument +(cpp11_default_template_argument_from_earlier_declaration), a friend of a +base class (cpp11_friend_of_base_accesses_member_through_derived), nested +pack expansions (cpp11_function_parameter_pack_in_nested_expansion), +explicit pack arguments (cpp11_explicit_pack_arguments_before_deduced_pack), +a class template pack in a function parameter pack expansion +(cpp11_class_pack_and_function_parameter_pack_in_one_expansion), the size +of a function parameter pack (cpp17_function_parameter_pack_after_non_type_ +pack), folds over a later pack (cpp17_fold_over_later_pack_in_constexpr_ +member), an empty function parameter pack +(cpp17_empty_function_parameter_pack_with_several_template_packs) and the +properties' function name (cpp11_statement_after_local_class_member_ +function). clang++ 18 -stdlib=libc++ accepts this program, and it fails +only its WRONG assertion. diff --git a/regression/cbmc-cpp/cpp20_libcxx_header_drops/tuple_convert.cpp b/regression/cbmc-cpp/cpp20_libcxx_header_drops/tuple_convert.cpp new file mode 100644 index 000000000000..78168c16ccf3 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_libcxx_header_drops/tuple_convert.cpp @@ -0,0 +1,13 @@ +#include +#include +extern "C" void __CPROVER_assert(bool, const char *); +int main() +{ + int x = 7; + std::tuple a(std::move(x)); + std::tuple b(std::move(a)); + __CPROVER_assert(std::get<0>(b) == 7, "converted"); + std::tuple c(std::forward_as_tuple(3)); + __CPROVER_assert(std::get<0>(c) == 3, "from forward_as_tuple"); + __CPROVER_assert(false, "WRONG (must FAIL)"); +} diff --git a/regression/cbmc-cpp/cpp20_libcxx_header_drops/unordered_set.cpp b/regression/cbmc-cpp/cpp20_libcxx_header_drops/unordered_set.cpp new file mode 100644 index 000000000000..65a150498b0c --- /dev/null +++ b/regression/cbmc-cpp/cpp20_libcxx_header_drops/unordered_set.cpp @@ -0,0 +1,11 @@ +#include +extern "C" void __CPROVER_assert(bool, const char *); +int main() +{ + std::unordered_set s; + s.insert(5); + s.insert(7); + __CPROVER_assert(s.count(5) == 1 && s.count(6) == 0, "count"); + __CPROVER_assert(s.size() == 2, "size"); + __CPROVER_assert(false, "WRONG (must FAIL)"); +} diff --git a/regression/cbmc-cpp/cpp20_libcxx_header_drops/views_filter.cpp b/regression/cbmc-cpp/cpp20_libcxx_header_drops/views_filter.cpp new file mode 100644 index 000000000000..8ffa8b152f8a --- /dev/null +++ b/regression/cbmc-cpp/cpp20_libcxx_header_drops/views_filter.cpp @@ -0,0 +1,12 @@ +#include + +extern "C" void __CPROVER_assert(bool, const char *); +int main() +{ + int a[] = {3, 1, 2}; + int n = 0; + for(int x : a | std::views::filter([](int x) { return x != 1; })) + n += x; + __CPROVER_assert(n == 5, "filter"); + __CPROVER_assert(false, "WRONG (must FAIL)"); +} diff --git a/regression/cbmc-cpp/cpp20_libcxx_header_drops/views_iota.cpp b/regression/cbmc-cpp/cpp20_libcxx_header_drops/views_iota.cpp new file mode 100644 index 000000000000..8c008d0b84a8 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_libcxx_header_drops/views_iota.cpp @@ -0,0 +1,11 @@ +#include + +extern "C" void __CPROVER_assert(bool, const char *); +int main() +{ + int m = 0; + for(int x : std::views::iota(1, 4)) + m += x; + __CPROVER_assert(m == 6, "iota"); + __CPROVER_assert(false, "WRONG (must FAIL)"); +} diff --git a/regression/cbmc-cpp/cpp20_libcxx_header_drops/views_transform.cpp b/regression/cbmc-cpp/cpp20_libcxx_header_drops/views_transform.cpp new file mode 100644 index 000000000000..d1aacb1f9654 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_libcxx_header_drops/views_transform.cpp @@ -0,0 +1,12 @@ +#include + +extern "C" void __CPROVER_assert(bool, const char *); +int main() +{ + int a[] = {3, 1, 2}; + int m = 0; + for(int x : a | std::views::transform([](int x) { return 2 * x; })) + m += x; + __CPROVER_assert(m == 12, "transform"); + __CPROVER_assert(false, "WRONG (must FAIL)"); +} diff --git a/regression/cbmc-cpp/cpp20_libcxx_header_drops/visit.cpp b/regression/cbmc-cpp/cpp20_libcxx_header_drops/visit.cpp new file mode 100644 index 000000000000..f5c92310981d --- /dev/null +++ b/regression/cbmc-cpp/cpp20_libcxx_header_drops/visit.cpp @@ -0,0 +1,20 @@ +#include +extern "C" void __CPROVER_assert(bool, const char *); +int main() +{ + std::variant v = 3; + struct F + { + int operator()(int x) const + { + return x; + } + int operator()(char c) const + { + return c; + } + }; + int r = std::visit(F{}, v); + __CPROVER_assert(r >= 3, "visit"); + __CPROVER_assert(false, "WRONG (must FAIL)"); +} diff --git a/regression/cbmc-cpp/cpp20_libcxx_optional/main.cpp b/regression/cbmc-cpp/cpp20_libcxx_optional/main.cpp new file mode 100644 index 000000000000..86595be55f57 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_libcxx_optional/main.cpp @@ -0,0 +1,8 @@ +// libc++ std::optional in C++20 mode +#include +int main() +{ + std::optional o = 42; + __CPROVER_assert(o.has_value(), "has_value"); + __CPROVER_assert(*o == 42, "value"); +} diff --git a/regression/cbmc-cpp/cpp20_libcxx_optional/test.desc b/regression/cbmc-cpp/cpp20_libcxx_optional/test.desc new file mode 100644 index 000000000000..67fcb318ac6c --- /dev/null +++ b/regression/cbmc-cpp/cpp20_libcxx_optional/test.desc @@ -0,0 +1,11 @@ +KNOWNBUG libcxx +main.cpp +--cpp20 --stdlib libc++ +^VERIFICATION +^EXIT=(0|10)$ +^SIGNAL=0$ +-- +^PARSING ERROR$ +^CONVERSION ERROR$ +dropped the body +-- diff --git a/regression/cbmc-cpp/cpp20_libcxx_span/main.cpp b/regression/cbmc-cpp/cpp20_libcxx_span/main.cpp new file mode 100644 index 000000000000..70a0f9d4a0c7 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_libcxx_span/main.cpp @@ -0,0 +1,8 @@ +// libc++ std::span +#include +int main() +{ + int a[] = {1, 2, 3}; + std::span s(a, 3); + __CPROVER_assert(s.size() == 3, "size"); +} diff --git a/regression/cbmc-cpp/cpp20_libcxx_span/test.desc b/regression/cbmc-cpp/cpp20_libcxx_span/test.desc new file mode 100644 index 000000000000..1bf26f6d5a04 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_libcxx_span/test.desc @@ -0,0 +1,12 @@ +KNOWNBUG libcxx +main.cpp +--cpp20 --stdlib libc++ --object-bits 10 +^VERIFICATION +^EXIT=(0|10)$ +^SIGNAL=0$ +-- +^PARSING ERROR$ +-- +libc++ span member access fails with "incomplete type on left hand +side" due to deferred template elaboration not completing the span +class before member access. diff --git a/regression/cbmc-cpp/cpp20_libstdcxx16_chrono_bodies_converted/main.cpp b/regression/cbmc-cpp/cpp20_libstdcxx16_chrono_bodies_converted/main.cpp new file mode 100644 index 000000000000..b4b73226109e --- /dev/null +++ b/regression/cbmc-cpp/cpp20_libstdcxx16_chrono_bodies_converted/main.cpp @@ -0,0 +1,8 @@ +#include +extern "C" void __CPROVER_assert(bool, const char *); +int main() +{ + std::chrono::seconds s{3}; + __CPROVER_assert(s.count() == 3, "duration"); + __CPROVER_assert(false, "WRONG (must FAIL)"); +} diff --git a/regression/cbmc-cpp/cpp20_libstdcxx16_chrono_bodies_converted/test.desc b/regression/cbmc-cpp/cpp20_libstdcxx16_chrono_bodies_converted/test.desc new file mode 100644 index 000000000000..0eb2e1e2be17 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_libstdcxx16_chrono_bodies_converted/test.desc @@ -0,0 +1,19 @@ +KNOWNBUG libstdcxx16 libstdcxx +main.cpp +--cpp20 --object-bits 12 +^\[main\.assertion\.1\] line \d+ duration: SUCCESS$ +^\[main\.assertion\.2\] line \d+ WRONG \(must FAIL\): FAILURE$ +^VERIFICATION FAILED$ +^EXIT=10$ +^SIGNAL=0$ +-- +^warning: ignoring +^CONVERSION ERROR$ +dropped the body +-- +With the libstdc++ 16.2.0 headers (g++ 16.2.0), lost the body of +`__get_leap_second_info': its local `constexpr leap_second_info +__after_last{.is_leap_second = false, .elapsed = seconds(...)}' passed +the designated-initializer node to seconds' constructor. Fixed with +cpp20_designated_initializer_of_class_type_member. Runs only with GCC 16 +headers (libstdcxx16). diff --git a/regression/cbmc-cpp/cpp20_libstdcxx16_format_bodies_converted/main.cpp b/regression/cbmc-cpp/cpp20_libstdcxx16_format_bodies_converted/main.cpp new file mode 100644 index 000000000000..81ff80836352 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_libstdcxx16_format_bodies_converted/main.cpp @@ -0,0 +1,8 @@ +#include +extern "C" void __CPROVER_assert(bool, const char *); +int main() +{ + std::string s = std::format("{}", 42); + __CPROVER_assert(s == "42", "format"); + __CPROVER_assert(false, "WRONG (must FAIL)"); +} diff --git a/regression/cbmc-cpp/cpp20_libstdcxx16_format_bodies_converted/test.desc b/regression/cbmc-cpp/cpp20_libstdcxx16_format_bodies_converted/test.desc new file mode 100644 index 000000000000..9769e6bd708c --- /dev/null +++ b/regression/cbmc-cpp/cpp20_libstdcxx16_format_bodies_converted/test.desc @@ -0,0 +1,17 @@ +KNOWNBUG libstdcxx16 libstdcxx +main.cpp +--cpp20 --show-goto-functions +^EXIT=0$ +^SIGNAL=0$ +-- +^warning: ignoring +^CONVERSION ERROR$ +dropped the body of system-header function +could not fully type-check +-- +With the libstdc++ 16.2.0 headers (g++ 16.2.0), lost the body of +`__do_vformat_to<_Sink_iter, wchar_t, ...>': its default +template argument __literal_encoding_is_unicode() builds a +string_view in a constexpr function, which the constant evaluator gave up +on. Fixed with cpp14_constexpr_local_objects_of_class_type. Runs only +with GCC 16 headers (libstdcxx16). diff --git a/regression/cbmc-cpp/cpp20_map_basic/main.cpp b/regression/cbmc-cpp/cpp20_map_basic/main.cpp new file mode 100644 index 000000000000..82e8d0194bd1 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_map_basic/main.cpp @@ -0,0 +1,8 @@ +// C++20 header +#include +int main() +{ + std::map m; + m[1] = 42; + __CPROVER_assert(m[1] == 42, "map access"); +} diff --git a/regression/cbmc-cpp/cpp20_map_basic/test.desc b/regression/cbmc-cpp/cpp20_map_basic/test.desc new file mode 100644 index 000000000000..dd45f482d577 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_map_basic/test.desc @@ -0,0 +1,134 @@ +KNOWNBUG +main.cpp +--cpp20 +^VERIFICATION SUCCESSFUL$ +^EXIT=0$ +^SIGNAL=0$ +-- +^CONVERSION ERROR$ +^.*is unknown.*$ +dropped the body +-- +C++20 : operator[] insert + access. + +Reclassified CORE -> KNOWNBUG by the member-typedef conformance fix +([temp.inst]/2, [dcl.typedef]). Previously this passed only because the +non-conformant *truncated* std::map had its operations havoc'd (symex executed +none of the real container; the property was vacuous). The fix makes the front +end conformant and symex now executes the REAL std::map / _Rb_tree machinery. + +Current layer (2026-07-15 evening): this exact program verifies fully +UNBOUNDED under --cpp11 after the delegating-piecewise-constructor chain +was fixed (cpp11_piecewise_delegating_ctor, cpp11_static_cast_base_rref, +and the earlier cpp11_* piecewise tests are all CORE, and +'m[1]=42; assert(m[1]==42)' verifies in ~1.6s bounded). Under --cpp20 +the headers construct the node through a DIFFERENT chain +(std::construct_at / _S_construct, C++20 constexpr allocator_traits): +the stored key byte is again malloc garbage (trace: storage[0]=64), so +the read-back re-inserts and the unbounded tree walk diverges in the +_Rb_tree_decrement model. NEXT: peel the C++20 construct_at chain the +same way. The FRONT-END chain is now complete: the free-function-template +new-initializer pack expansion (cpp11_construct_at_pack_args), the void +constexpr wrapper deferral (cpp11_void_constexpr_wrapper_defer), and the +trailing-return decltype-over-pack-new deduction +(cpp11_construct_at_decltype_return) are all fixed and CORE. With them, +--cpp20 instantiates std::construct_at and runs std::map's piecewise node +construction (the key is stored correctly). The REMAINING reason this +test does not pass is a bounded-model-checking SOLVER-SCALING limit on the +fully-inlined C++20 container: without an unwind bound the _Rb_tree +machinery builds a formula the SAT backend cannot discharge in the time +budget (at --unwind 5 the equation is built in ~6.5min and the solver +then runs out of resources). This is not a front-end conformance issue: +the identical program verifies unbounded under --cpp11 (the C++11 headers +inline less). Reclassify to CORE if/when the container machinery is +made tractable (a lighter model, or bounded --unwind with a coarser +property). + +Second-tier verification-PERFORMANCE item, not a conformance one; the previous +"pass" was unsound. Reclassify back to CORE once symex is tractable on the real +container. +See doc/architectural/cpp-class-template-instantiation-plan.md. + +--paths lifo 2026-07-17: path-wise symex NEUTRALIZES the one-shot +blow-up completely -- a verdict in ~42-60s at --unwind 5/6/7 (vs. >15 +min without a verdict one-shot). BUT the verdict is VERIFICATION +FAILED, and the counterexample REFRAMES this test: the failing +dereferences are inside std::_Rb_tree_insert_and_rebalance, which is +defined in libstdc++'s COMPILED tree.cc (not the headers), so CBMC has +no body for it and havocs the call: the tree linkage after insert is +nondet garbage. m[1] == 42 can therefore never verify, at ANY unwind, +with ANY solver. The real blocker is a missing model for the tree.cc +entry points (_Rb_tree_insert_and_rebalance, _Rb_tree_increment, +_Rb_tree_decrement, _Rb_tree_rebalance_for_erase) -- e.g. in +src/cpp/library/ next to new.c. A model may do plain BST linking + +header (leftmost/rightmost) maintenance and skip the rebalancing +rotations: recoloring affects only balance, not the container's +functional semantics. Once modelled, --paths lifo (or one-shot at +--unwind 5) is expected to be tractable. + +CORRECTION 2026-07-17 (follow-up): the tree.cc entry points ARE already +modelled (cpp_typecheck_stdlib.cpp: make_rb_insert_and_rebalance_body, +_Rb_tree_increment/_Rb_tree_decrement successor/predecessor walks, +make_rb_rebalance_for_erase_body) and the model bodies ARE present in +the goto program -- the earlier "havoc'd" reading misread the model's +own parameter ASSUMEs. The real remaining blocker, isolated from the +--paths lifo counterexample down to a 6-line reproducer +(cpp20_pair_converting_ctor): C++20 libstdc++ pair's requires-clause + +explicit(bool) converting constructor pair(U1&&, U2&&) is instantiated +WITHOUT a body (constexpr/macro-flagged, nil value, never queued for +deferred conversion), so _M_get_insert_unique_pos's `_Res(__y, 0)` +returns garbage and insert misbehaves. Fix that defect first; then +retest one-shot and --paths lifo. + +UPDATE 2026-07-17 night: the pair converting-constructor layer is FIXED +(cpp20_pair_converting_ctor and both requires-atom tests are CORE). +NEW FRONTIER exposed one level up: _M_get_insert_hint_unique_pos's +`__res` (a C++20 pair<_Base_ptr,_Base_ptr>, which now has constrained +constructors and derives from the empty __pair_base) receives GARBAGE +through the sret-lowered tail call `return _M_get_insert_unique_pos(k)` +-- the inner call's result {NULL, &header} is correct in ITS __res, but +the value is lost in the hidden-result handoff (trace: first=NULL+ +177253069). Suspect the elide_cpp_returned_temporaries substitution +interacting with the derived-to-__pair_base "ignoring typecast" shape +in the returned-temporary construction. Then the garbage position +flows into _Rb_tree_insert_and_rebalance (__p->_M_left dereference +failures). + +UPDATE 2026-07-18: the "pair sret handoff" suspicion was wrong. cvise +reduction (valgrind/UBSan-clean interestingness) isolated the false +positive to cpp11_map_value_loss_reduced: PRIMARY root cause is +cpp11_alignas_member_layout -- CBMC ignores alignas in struct layout, +so __aligned_membuf (_Rb_tree_node storage) has sizeof 1 instead of 4 +and every node value store/load is out of bounds; SECONDARY, the +synthesized copy assignment of empty-base-only classes (less : +binary_function, __pair_base) emits a struct-to-base typecast the SAT +encoder drops ("warning: ignoring typecast"). Fix alignas layout +first, then re-triage. + +UPDATE 2026-07-19: three more layers fixed (GNU __alignof__(expr) in +C++ -- the __aligned_membuf alignment silently degraded to 1; c_bool +constants unrecognized by the requires-satisfaction evaluator; a +throwing constraint evaluation keeping libstdc++ pair's unsatisfiable +converting constructor alive, which forwarded the literal 0 into +_M_get_insert_*_pos's pointer pair). ALL pointer checks now pass at +--unwind 6 --paths lifo; theremaining failure is a pure value loss in the +piecewise pair construction chain -- reduced to +cpp20_map_piecewise_value_loss (171 header-free lines). + +UPDATE 2026-07-19 late: the piecewise construction chain is FIXED +(P0960 paren-aggregate-init + deleted-implicit-default-ctor; +cpp20_map_piecewise_value_loss is CORE) -- forward_as_tuple now has a +real body and the key reaches the node. The remaining failure at +--unwind 2 is the next layer: the SECOND operator[] lookup's +_M_get_insert_hint_unique_pos takes the equivalent-keys path with +__pos._M_node == NULL (iterator equality/decrement layer), so the +returned reference is derived from a null hint. + +FIXED 2026-07-20 (final layer): pack-expansion mem-initializers of +instantiated constructors are now expanded per element with type AND +non-type packs substituted in lockstep ([temp.variadic]/9), and +substitution failures while matching overloaded candidates are +deduction failures ([temp.deduct.general]/8) instead of hard errors -- +std::pair's piecewise delegation target converts, so the map's key +reaches the node. The full layer history is in this desc's earlier +updates; every layer has its own CORE test. diff --git a/regression/cbmc-cpp/cpp20_map_basic_libcxx/main.cpp b/regression/cbmc-cpp/cpp20_map_basic_libcxx/main.cpp new file mode 100644 index 000000000000..82e8d0194bd1 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_map_basic_libcxx/main.cpp @@ -0,0 +1,8 @@ +// C++20 header +#include +int main() +{ + std::map m; + m[1] = 42; + __CPROVER_assert(m[1] == 42, "map access"); +} diff --git a/regression/cbmc-cpp/cpp20_map_basic_libcxx/test.desc b/regression/cbmc-cpp/cpp20_map_basic_libcxx/test.desc new file mode 100644 index 000000000000..594efbb1e0d1 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_map_basic_libcxx/test.desc @@ -0,0 +1,23 @@ +KNOWNBUG libcxx +main.cpp +--cpp20 --stdlib libc++ --object-bits 12 --unwind 5 --no-unwinding-assertions +^\[main\.assertion\.1\] line 7 map access: SUCCESS$ +^VERIFICATION SUCCESSFUL$ +^EXIT=0$ +^SIGNAL=0$ +-- +-- +std::map insert via operator[] and read-back. Flipped +KNOWNBUG->CORE 2026-08-10 after the final three layers: +(1) [basic.lookup.qual.general]/3 qualified-lookup fix (round 31), +(2) implied-object constness in member-template overload ranking + ([over.call.func]/3; __tree::find/__lower_bound, CORE + cpp11_member_template_const_overload), +(3) member-of-temporary implied-object binding ([expr.ref]/7.2, + [over.match.funcs.general]/5; operator[]'s + __emplace_unique_key_args(...).first->__get_value(), CORE + cpp11_member_of_temporary_call). +--object-bits 12: the full conversion exceeds 2^8 objects. +--unwind 5 --no-unwinding-assertions: __tree recursion; bounded +harness. 0 of 6002 properties fail; runtime-verified natively with +clang++ -stdlib=libc++. diff --git a/regression/cbmc-cpp/cpp20_map_piecewise_value_loss/main.cpp b/regression/cbmc-cpp/cpp20_map_piecewise_value_loss/main.cpp new file mode 100644 index 000000000000..f5b9eddc91ed --- /dev/null +++ b/regression/cbmc-cpp/cpp20_map_piecewise_value_loss/main.cpp @@ -0,0 +1,286 @@ +// cvise reduction (ASan/UBSan/valgrind-clean; interestingness also +// required all CBMC pointer checks green, so the failure is purely a +// VALUE loss) of cpp20_map_basic's remaining false positive. +// +// The essential ingredient is libstdc++'s piecewise pair construction +// (gcc-13 / shapes): the delegating converting +// constructor pair(piecewise_construct_t, tuple<_Args1...>, +// tuple<_Args2...>) delegates to the _Index_tuple-tag constructor +// whose mem-initializer expands `first(get<_Indexes1>(__tuple1)...)` +// (N5008 [class.base.init], [temp.variadic]). Under CBMC the value +// written through this chain is lost: the key read back from the node +// is 0 instead of 1, and the reference returned by operator[] points +// at storage offset 12 instead of offset 4 of pair. +// Replacing the piecewise construction with a direct pair(k, 0) +// construction makes the identical program verify. +// +// This used to fail: forward_as_tuple's body constructs +// `tuple<_Elements...>(__args...)` -- C++20 parenthesized aggregate +// initialization (P0960), since tuple here has no matching +// constructor -- which the front end could not resolve; the body was +// silently dropped and the piecewise-constructed key was havocked. +// Fixed by implementing the constructor-first paren-aggregate +// fallback ([dcl.init.general]/16.6.2.2) and deleted-implicit-default- +// constructor semantics ([class.default.ctor]/2). g++ verifies at +// runtime (clang++ lacks the GCC __integer_pack builtin used by the +// gcc libstdc++ shape this reproduces). +namespace std +{ +template +struct tuple_element; +template +using __tuple_element_t = tuple_element<__i, _Tp>::type; +template +struct _Index_tuple +{ +}; +template +struct _Build_index_tuple +{ + using __type = _Index_tuple<__integer_pack(_Num)...>; +}; +template +struct _Nth_type; +template +struct _Nth_type<0, _Tp0, _Rest...> +{ + using type = _Tp0; +}; +int piecewise_construct; +template +class tuple; +template +struct pair +{ + int first; + _T2 second; + template + pair(int, tuple<_Args1...> __first, tuple<_Args2...> __second) + : pair( + __first, + __second, + typename _Build_index_tuple::__type(), + typename _Build_index_tuple::__type()) + { + } + template + pair( + tuple<_Args1...> __tuple1, + tuple<_Args2...>, + _Index_tuple<_Indexes1...>, + _Index_tuple<>) + : first(get<_Indexes1>(__tuple1)...) + { + } + pair(int, _T2 __y) : second(__y) + { + } +}; +struct _Head_base +{ + static int _M_head(_Head_base __b) + { + return __b._M_head_impl; + } + int _M_head_impl; +}; +template +struct _Tuple_impl; +template +struct _Tuple_impl<_Idx, _Head> : _Head_base +{ + template + _Tuple_impl(_UHead __head) : _Head_base(__head) + { + } +}; +template +struct tuple : _Tuple_impl<0, _Elements...> +{ +}; +template <> +struct tuple<> +{ +}; +template +struct tuple_element<__i, tuple<_Types...>> +{ + using type = _Nth_type<__i, _Types...>::type; +}; +template +_Head __get_helper(_Tuple_impl<__i, _Head> &__t) +{ + return _Tuple_impl<__i, _Head>::_M_head(__t); +} +template +__tuple_element_t<__i, tuple<_Elements...>> get(tuple<_Elements...> __t) +{ + return __get_helper(__t); +} +template +tuple<_Elements...> forward_as_tuple(_Elements... __args) +{ + return tuple<_Elements...>(__args...); +} +} // namespace std +void *operator new(unsigned long, void *__p) +{ + return __p; +} +namespace std +{ +template +void construct_at(_Tp *__location, _Args... __args) +{ + new(__location) _Tp(__args...); +} +template +struct __new_allocator +{ + _Tp *allocate(long) + { + return static_cast<_Tp *>(operator new(sizeof(_Tp))); + } +}; +template +struct allocator_traits; +template +struct allocator_traits<__new_allocator<_Tp>> +{ + using allocator_type = __new_allocator<_Tp>; + template + using rebind_alloc = __new_allocator<_Up>; + static _Tp *allocate(allocator_type __a, long __n) + { + return __a.allocate(__n); + } + template + static void construct(allocator_type, _Up __p, _Args... __args) + { + construct_at(__p, __args...); + } +}; +} // namespace std +template +struct __alloc_traits : std::allocator_traits<_Alloc> +{ + template + struct rebind + { + typedef std::allocator_traits<_Alloc>::template rebind_alloc<_Tp> other; + }; +}; +struct __aligned_membuf +{ + char _M_storage[sizeof(std::pair)]; +}; +namespace std +{ +struct _Rb_tree_node_base +{ + typedef _Rb_tree_node_base *_Base_ptr; + _Base_ptr _M_parent; +}; +struct _Rb_tree_node : _Rb_tree_node_base +{ + __aligned_membuf _M_storage; + pair *_M_valptr() + { + void *__trans_tmp_16(&_M_storage); + return static_cast *>(__trans_tmp_16); + } +}; +typedef _Rb_tree_node_base::_Base_ptr _Base_ptr; +struct _Rb_tree_iterator +{ + _Rb_tree_iterator(_Base_ptr __x) : _M_node(__x) + { + } + pair &operator*() + { + return *static_cast<_Rb_tree_node *>(_M_node)->_M_valptr(); + } + _Base_ptr _M_node; +}; +typedef __alloc_traits<__new_allocator>>::rebind< + _Rb_tree_node>::other _Node_allocator; +typedef __alloc_traits<_Node_allocator> _Alloc_traits; +struct _Rb_tree_const_iterator +{ + _Rb_tree_const_iterator(_Rb_tree_iterator) + { + } +}; +typedef _Rb_tree_node *_Link_type; +_Rb_tree_node_base _M_header; +_Rb_tree_iterator _M_lower_bound(_Link_type __x, _Base_ptr __y) +{ + while(__x) + { + __y = __x; + __x = 0; + } + return __y; +} +pair<_Base_ptr, _Base_ptr> _M_get_insert_unique_pos(int __k) +{ + _Base_ptr __trans_tmp_13 = &_M_header; + if(__k) + return pair<_Base_ptr, _Base_ptr>(0, __trans_tmp_13); + return pair<_Base_ptr, _Base_ptr>(0, 0); +} +template +_Link_type _M_create_node(_Args... __args) +{ + _Node_allocator __a; + _Link_type __n = _Alloc_traits::allocate(__a, 1); + pair *__vp = __n->_M_valptr(); + _Alloc_traits::construct(__a, __vp, __args...); + return __n; +} +_Rb_tree_iterator end() +{ + return &_M_header; +} +_Rb_tree_iterator lower_bound() +{ + return _M_lower_bound( + static_cast<_Link_type>(_M_header._M_parent), &_M_header); +} +struct +{ + template + auto _M_emplace_hint_unique(_Rb_tree_const_iterator, _Args... __args) + -> _Rb_tree_iterator + { + _Link_type __node = _M_create_node(__args...); + _Rb_tree_node __x = *__node; + pair __pk = *__x._M_valptr(); + auto __res = _M_get_insert_unique_pos(__pk.first); + _Rb_tree_node_base &__header(_M_header); + if(__res.second) + __header._M_parent = __node; + return __node; + } +} _M_t; +struct map +{ + int &operator[](int __k) + { + _Rb_tree_iterator __i = lower_bound(); + if(__i._M_node == end()._M_node) + { + tuple __t1 = forward_as_tuple(__k); + __i = + _M_t._M_emplace_hint_unique(__i, piecewise_construct, __t1, tuple<>()); + } + return (*__i).second; + } +}; +} // namespace std +int main() +{ + std::map m; + m[1] = 2; + __CPROVER_assert(m[1], "value survives piecewise construction"); +} diff --git a/regression/cbmc-cpp/cpp20_map_piecewise_value_loss/test.desc b/regression/cbmc-cpp/cpp20_map_piecewise_value_loss/test.desc new file mode 100644 index 000000000000..c461ccbeced1 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_map_piecewise_value_loss/test.desc @@ -0,0 +1,20 @@ +KNOWNBUG +main.cpp +--cpp20 --object-bits 12 --unwind 2 --no-unwinding-assertions +^\[main\.assertion\.1\] line \d+ .*: SUCCESS$ +^VERIFICATION SUCCESSFUL$ +^EXIT=0$ +^SIGNAL=0$ +-- +dropped the body +-- +cvise reduction of cpp20_map_basic's last layer: the piecewise pair +construction chain (delegating ctor + _Index_tuple pack-expansion +mem-init) loses the constructed value; the operator[] reference lands +at offset 12 instead of 4. All pointer checks stay green -- pure +value corruption. + +FIXED 2026-07-19: C++20 parenthesized aggregate initialization (P0960) +implemented as constructor-first fallback, plus deleted-implicit- +default-constructor semantics ([class.default.ctor]/2) so classes with +a non-default-constructible base convert at all. diff --git a/regression/cbmc-cpp/cpp20_member_class_template_of_constrained_class_template/main.cpp b/regression/cbmc-cpp/cpp20_member_class_template_of_constrained_class_template/main.cpp new file mode 100644 index 000000000000..86e430b82982 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_member_class_template_of_constrained_class_template/main.cpp @@ -0,0 +1,59 @@ +// N5008 [temp.mem]/1, [temp.pre]/1: a member class template of a class +// template defined outside the class has two template-heads; with a +// requires-clause in the first, `template requires small +// template class view::iterator { ... }', Const is still +// the member template's parameter. The outer head replaced the inner one +// ("symbol 'Const' is unknown"); libc++'s transform_view::__iterator is +// defined this way. The associated constraints are the conjunction of +// both requires-clauses ([temp.constr.decl]/3). +extern "C" void __CPROVER_assert(bool, const char *); + +template +struct maybe_const +{ + using type = T; +}; + +template +concept small = sizeof(T) <= 8; + +template + requires small +struct view +{ + template + class iterator; + iterator begin() + { + return {v}; + } + iterator cbegin() + { + return {v}; + } + V v; +}; + +template + requires small +template +class view::iterator +{ + using Base = typename maybe_const::type; + +public: + Base cur; + Base get() const + { + return cur + (Const ? 1 : 0); + } +}; + +int main() +{ + view w{3}; + __CPROVER_assert(w.begin().get() == 3, "Const = false"); + __CPROVER_assert(w.cbegin().get() == 4, "Const = true"); + __CPROVER_assert(false, "WRONG (must FAIL)"); + return 0; +} diff --git a/regression/cbmc-cpp/cpp20_member_class_template_of_constrained_class_template/test.desc b/regression/cbmc-cpp/cpp20_member_class_template_of_constrained_class_template/test.desc new file mode 100644 index 000000000000..947267686e46 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_member_class_template_of_constrained_class_template/test.desc @@ -0,0 +1,14 @@ +KNOWNBUG +main.cpp +--cpp20 +^\[main\.assertion\.[0-9]\] .* Const = false: SUCCESS$ +^\[main\.assertion\.[0-9]\] .* Const = true: SUCCESS$ +^\[main\.assertion\.3\] .* WRONG \(must FAIL\): FAILURE$ +^VERIFICATION FAILED$ +^EXIT=10$ +^SIGNAL=0$ +-- +^warning: ignoring +-- +g++ 13 and clang++ 18 accept this program, and it fails only its WRONG +assertion. diff --git a/regression/cbmc-cpp/cpp20_member_class_template_own_param_friend/main.cpp b/regression/cbmc-cpp/cpp20_member_class_template_own_param_friend/main.cpp new file mode 100644 index 000000000000..406293479a3f --- /dev/null +++ b/regression/cbmc-cpp/cpp20_member_class_template_own_param_friend/main.cpp @@ -0,0 +1,63 @@ +// N5008 [basic.scope.temp]/2 + [basic.scope.temp]/2: inside a member class +// template defined out of line, the member template's OWN parameter is in scope +// for its members -- including as a DEFAULT TEMPLATE ARGUMENT of a friend +// declared inside it: +// template template +// class view_::sentinel_ { +// template friend bool operator==(...); +// }; +// This is libc++'s take_view::__sentinel shape (the ranges pipe). +// Resolving `Const` throws while the friend is instantiated (the +// enclosing member template's parameter is not bound in that context), +// and main is silently dropped. +// g++ and clang++ both accept (-Werror) and run clean. +extern "C" void __CPROVER_assert(bool, const char *); +template +struct iter_holder +{ + T v_; + T base() const + { + return v_; + } +}; +template +using maybe_const = T; +template +struct view_ +{ + V base_; + template + class sentinel_; + auto end() + { + return sentinel_{}; + } + auto begin() + { + return iter_holder{base_}; + } +}; +template +template +class view_::sentinel_ +{ +public: + template + using iter_ = iter_holder>; + // friend whose default template argument names the member class + // template's OWN parameter + template + friend bool operator==(iter_ lhs, sentinel_) + { + return lhs.base() == 0; + } +}; +int main() +{ + view_ v{0}; + auto b = v.begin(); + auto s = v.end(); + __CPROVER_assert(b == s, "friend default arg names member's own parameter"); + return 0; +} diff --git a/regression/cbmc-cpp/cpp20_member_class_template_own_param_friend/test.desc b/regression/cbmc-cpp/cpp20_member_class_template_own_param_friend/test.desc new file mode 100644 index 000000000000..f68e571df5ef --- /dev/null +++ b/regression/cbmc-cpp/cpp20_member_class_template_own_param_friend/test.desc @@ -0,0 +1,15 @@ +KNOWNBUG +main.cpp +--cpp20 +^\[main\.assertion\.1\] line \d+ friend default arg names member's own parameter: SUCCESS$ +^VERIFICATION SUCCESSFUL$ +^EXIT=0$ +^SIGNAL=0$ +-- +dropped the body +-- +N5008 [class.friend]/1 + [basic.scope.temp]/2, [basic.scope.class]/1 + +[dcl.meaning.general]/2.3: the friend's name is a namespace member, but its +declaration is looked up in the class -- here the enclosing member class +template's own parameter (as a default template argument) and the class's member +alias. diff --git a/regression/cbmc-cpp/cpp20_member_class_template_with_two_constrained_template_heads/main.cpp b/regression/cbmc-cpp/cpp20_member_class_template_with_two_constrained_template_heads/main.cpp new file mode 100644 index 000000000000..fe6be566bb35 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_member_class_template_with_two_constrained_template_heads/main.cpp @@ -0,0 +1,57 @@ +// N5008 [temp.mem]/1, [temp.constr.decl]/3: a member class template of a +// constrained class template defined outside the class has two +// template-heads, each with a requires-clause; the associated constraints +// are their conjunction. Guards the merge of nested template-heads after a +// requires-clause (both clauses parsed: the parser's count-only fallback +// for an unparseable clause is not reached by any valid clause known). +// g++ 13 accepts the program; clang++ 18 and 20 reject it ("requires +// clause differs in template redeclaration"), although the clauses are the +// same as in the declarations ([temp.over.link]/6). +extern "C" void __CPROVER_assert(bool, const char *); +template +concept small = sizeof(T) <= 4; +template + requires small +struct view +{ + template + requires small + struct box; + template + requires requires(U u) { u + 1; } + struct num; +}; +template + requires small +template + requires small +struct view::box +{ + U u; + V v; + int sum() const + { + return u + v; + } +}; +template + requires small +template + requires requires(U u) { u + 1; } +struct view::num +{ + U u; + int next() const + { + return u + 1; + } +}; +int main() +{ + view::box b{2, 40}; + view::num n{6}; + __CPROVER_assert(b.sum() == 42, "both template-heads constrained"); + __CPROVER_assert(n.next() == 7, "inner requires-expression"); + __CPROVER_assert(false, "WRONG (must FAIL)"); + return 0; +} diff --git a/regression/cbmc-cpp/cpp20_member_class_template_with_two_constrained_template_heads/test.desc b/regression/cbmc-cpp/cpp20_member_class_template_with_two_constrained_template_heads/test.desc new file mode 100644 index 000000000000..f1c64e4a89a1 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_member_class_template_with_two_constrained_template_heads/test.desc @@ -0,0 +1,14 @@ +KNOWNBUG +main.cpp +--cpp20 +^\[main\.assertion\.1\] .* both template-heads constrained: SUCCESS$ +^\[main\.assertion\.2\] .* inner requires-expression: SUCCESS$ +^\[main\.assertion\.3\] .* WRONG \(must FAIL\): FAILURE$ +^VERIFICATION FAILED$ +^EXIT=10$ +^SIGNAL=0$ +-- +^warning: ignoring +-- +g++ 13 accepts this program, and it fails only its WRONG assertion. clang++ +rejects it (see main.cpp); there is no clang harness check for this test. diff --git a/regression/cbmc-cpp/cpp20_member_overload_converting_ctor/main.cpp b/regression/cbmc-cpp/cpp20_member_overload_converting_ctor/main.cpp new file mode 100644 index 000000000000..954a1c0da24b --- /dev/null +++ b/regression/cbmc-cpp/cpp20_member_overload_converting_ctor/main.cpp @@ -0,0 +1,65 @@ +// A member function taking a "const_iterator"-like type, called with an +// "iterator"-like argument, inside an instantiated function template body. +// The iterator -> const_iterator conversion is a user-defined conversion via +// a converting constructor template whose parameter is a class-template-id +// (Iter); Q is deduced from the argument ([temp.deduct.type]/3.3). +// +// This mirrors libstdc++ vector::erase(const_iterator, const_iterator) called +// (in std::erase_if's body) with iterator arguments. Direct initialization +// `const_iterator c = it;` resolves the conversion correctly, but during the +// member-call overload resolution for erase() inside the template body the +// candidate is rejected before the user-defined conversion is applied, so the +// call is dropped and the container is not modified -- here `n` stays 3 and the +// assertion fails. (In a non-template / direct call site the same unresolved +// call is silently dropped together with the rest of the full-expression, which +// is why such uses appear to "pass" only vacuously.) +// +// KNOWNBUG: reclassify CORE once the iterator->const_iterator user-defined +// conversion (template converting constructor with a class-template-id +// parameter) is applied during member-call overload resolution. +template +struct Iter +{ + P p; + Iter() : p(0) + { + } + template + Iter(const Iter &) : p(0) + { + } +}; +template +struct Vec +{ + typedef T *pointer; + typedef Iter iterator; + typedef Iter const_iterator; + int n; + iterator begin() + { + return iterator{}; + } + iterator end() + { + return iterator{}; + } + void erase(const_iterator, const_iterator) + { + n = n - 1; + } +}; +template +void doit(Vec &c) +{ + c.erase(c.begin(), c.end()); // iterator args -> const_iterator params +} +int main() +{ + Vec v; + v.n = 3; + doit(v); + __CPROVER_assert( + v.n == 2, "member erase(iterator->const_iterator) in template body"); + return 0; +} diff --git a/regression/cbmc-cpp/cpp20_member_overload_converting_ctor/test.desc b/regression/cbmc-cpp/cpp20_member_overload_converting_ctor/test.desc new file mode 100644 index 000000000000..2d34c278adba --- /dev/null +++ b/regression/cbmc-cpp/cpp20_member_overload_converting_ctor/test.desc @@ -0,0 +1,33 @@ +KNOWNBUG +main.cpp +--cpp20 +^\[main\.assertion\.1\] line \d+ member erase\(iterator->const_iterator\) in template body: SUCCESS$ +^VERIFICATION SUCCESSFUL$ +^EXIT=0$ +^SIGNAL=0$ +-- +^.*found no match for symbol.*$ +^CONVERSION ERROR$ +dropped the body +-- +A user-defined conversion (iterator -> const_iterator) via a converting +constructor template whose parameter is a class-template-id (Iter) is +applied during member-call overload resolution inside an instantiated function +template body. The overloaded member erase(const_iterator, const_iterator) is +viable for iterator arguments, so the call runs and the assertion holds. + +Root cause and fix (cpp_typecheck_conversions.cpp, +user_defined_conversion_sequence template-constructor fallback): when no +non-template converting constructor matched, the fallback builds a temporary of +the target type via new_temporary and inspects it for the constructor that +performed the conversion. The search (`find_ctor`) returned the *first* +constructor anywhere in the result, which for a prvalue argument such as +`c.begin()` was the source iterator's own materialisation constructor (a ctor +of a *different* type), causing the valid conversion to be rejected. The fix +scopes `find_ctor` to constructors of the *target* type, so the source +argument's materialisation constructor is ignored. This matches the standard's +[over.match.copy] / [class.conv.ctor]/2 (only the target's non-explicit +converting constructor participates) and made `iterator -> const_iterator` work +for prvalue arguments as it already did for lvalues (`const_iterator c = it;`). +This is the header-free analogue of std::erase_if's +`__cont.erase(iterator, iterator)` (see cpp20_vector_erase_if). diff --git a/regression/cbmc-cpp/cpp20_mid_pack_decltype_invoke/main.cpp b/regression/cbmc-cpp/cpp20_mid_pack_decltype_invoke/main.cpp new file mode 100644 index 000000000000..2bc93ef82e6f --- /dev/null +++ b/regression/cbmc-cpp/cpp20_mid_pack_decltype_invoke/main.cpp @@ -0,0 +1,42 @@ +// libc++ __bind_back_op shape: the mid/trailing-pack overload +// `operator()(_Fn, _BoundArgs...)` reached through TWO nested +// decltypes (invoke_'s F()() over pf's Op()(Idx...)). Ties together +// the round-34 pack fixes: multi-pack replay, pack_expr splice, +// empty-pack strip with the own-pack constraint. +extern "C" void __CPROVER_assert(bool, const char *); +template +struct integer_sequence; +template +using index_sequence = integer_sequence; +struct op +{ + template + int operator()(F, B...) + { + return 7; + } +}; +template +struct pf; +template +struct pf> +{ + template + auto operator()() -> decltype(Op()(Idx...)) + { + return Op()(Idx...); + } +}; +struct bb : pf> +{ +} c; +template +decltype(F()()) invoke_(F f) +{ + return f(); +} +int main() +{ + __CPROVER_assert(invoke_(c) == 7, "mid param pack in decltype"); + return 0; +} diff --git a/regression/cbmc-cpp/cpp20_mid_pack_decltype_invoke/test.desc b/regression/cbmc-cpp/cpp20_mid_pack_decltype_invoke/test.desc new file mode 100644 index 000000000000..0b152ce48e02 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_mid_pack_decltype_invoke/test.desc @@ -0,0 +1,13 @@ +KNOWNBUG libcxx +main.cpp +--cpp20 --stdlib libc++ +^\[main\.assertion\.1\] line \d+ mid param pack in decltype: SUCCESS$ +^VERIFICATION SUCCESSFUL$ +^EXIT=0$ +^SIGNAL=0$ +-- +dropped the body +-- +Pre-fix: main silently dropped (vacuous SUCCESS); this desc requires +the assertion line. Runtime-verified with clang++ (g++ rejects the +alias-template pack deduction shape). diff --git a/regression/cbmc-cpp/cpp20_modules/main.cpp b/regression/cbmc-cpp/cpp20_modules/main.cpp new file mode 100644 index 000000000000..291075eb1ffd --- /dev/null +++ b/regression/cbmc-cpp/cpp20_modules/main.cpp @@ -0,0 +1,58 @@ +// C++20 modules — basic syntax support +// CBMC parses module declarations and treats the file as a normal TU. +export module hello; + +// Single exported function +export int f() +{ + return 42; +} + +// Exported class +export class Widget +{ +public: + int value; + int get() const + { + return value; + } +}; + +// Export block with multiple declarations +export +{ + int add(int a, int b) + { + return a + b; + } + int sub(int a, int b) + { + return a - b; + } +} + +// Non-exported (module-internal) declaration +int internal_helper() +{ + return 1; +} + +// Private module fragment +module :private; + +int secret() +{ + return 99; +} + +int main() +{ + __CPROVER_assert(f() == 42, "f returns 42"); + Widget w; + w.value = 10; + __CPROVER_assert(w.get() == 10, "get returns value"); + __CPROVER_assert(add(2, 3) == 5, "add works"); + __CPROVER_assert(sub(5, 3) == 2, "sub works"); + __CPROVER_assert(secret() == 99, "secret works"); +} diff --git a/regression/cbmc-cpp/cpp20_modules/test.desc b/regression/cbmc-cpp/cpp20_modules/test.desc new file mode 100644 index 000000000000..3f595be7f6d5 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_modules/test.desc @@ -0,0 +1,10 @@ +KNOWNBUG gcc-only +main.cpp +--cpp20 +^EXIT=0$ +^SIGNAL=0$ +^VERIFICATION SUCCESSFUL$ +-- +^warning: ignoring +dropped the body +-- diff --git a/regression/cbmc-cpp/cpp20_msvc_no_unique_address/main.cpp b/regression/cbmc-cpp/cpp20_msvc_no_unique_address/main.cpp new file mode 100644 index 000000000000..f78a69503835 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_msvc_no_unique_address/main.cpp @@ -0,0 +1,33 @@ +// Visual Studio ignores [[no_unique_address]] and gives an empty member +// declared [[msvc::no_unique_address]] zero size (N5008 [intro.object]/8: +// implementation-defined). +extern "C" void __CPROVER_assert(bool, const char *); +struct E +{ +}; +struct S1 +{ + char d[3]; + [[no_unique_address]] E e; + char c; +}; +struct S2 +{ + char d[3]; + [[msvc::no_unique_address]] E e; + char c; +}; +struct S3 +{ + [[msvc::no_unique_address]] E a; + [[msvc::no_unique_address]] E b; + int i; +}; +int main() +{ + __CPROVER_assert(sizeof(S1) == 5, "ignored by Visual Studio"); + __CPROVER_assert(sizeof(S2) == 4, "msvc::no_unique_address"); + __CPROVER_assert(sizeof(S3) == 4, "two members"); + __CPROVER_assert(false, "WRONG (must FAIL)"); + return 0; +} diff --git a/regression/cbmc-cpp/cpp20_msvc_no_unique_address/test.desc b/regression/cbmc-cpp/cpp20_msvc_no_unique_address/test.desc new file mode 100644 index 000000000000..3376368ef61c --- /dev/null +++ b/regression/cbmc-cpp/cpp20_msvc_no_unique_address/test.desc @@ -0,0 +1,18 @@ +KNOWNBUG +main.cpp +--winx64 +^\[main\.assertion\.1\] line \d+ ignored by Visual Studio: SUCCESS$ +^\[main\.assertion\.2\] line \d+ msvc::no_unique_address: SUCCESS$ +^\[main\.assertion\.3\] line \d+ two members: SUCCESS$ +^\[main\.assertion\.4\] line \d+ WRONG \(must FAIL\): FAILURE$ +^\*\* 1 of \d+ failed +^VERIFICATION FAILED$ +^EXIT=10$ +^SIGNAL=0$ +-- +^warning: ignoring +static assertion failed +could not be evaluated +-- +Neither attribute changed the layout: [[msvc::no_unique_address]] was +ignored. diff --git a/regression/cbmc-cpp/cpp20_msvc_no_unique_address_placement/main.cpp b/regression/cbmc-cpp/cpp20_msvc_no_unique_address_placement/main.cpp new file mode 100644 index 000000000000..fed093e6aa0d --- /dev/null +++ b/regression/cbmc-cpp/cpp20_msvc_no_unique_address_placement/main.cpp @@ -0,0 +1,44 @@ +// Visual Studio gives an empty member declared [[msvc::no_unique_address]] +// zero size (N5008 [intro.object]/8: implementation-defined). The +// expected offsets are those of clang++ 18 for x86_64-pc-windows-msvc, +// which follows the Microsoft C++ ABI (-fdump-record-layouts): it tries +// offset 0 and then the following offsets, instead of the Itanium data +// size. +extern "C" void __CPROVER_assert(bool, const char *); +struct E +{ +}; +struct alignas(8) A8 +{ +}; +struct R1 +{ + E x; + int i; + [[msvc::no_unique_address]] E e; +}; +struct R2 +{ + E x; + [[msvc::no_unique_address]] E e; + int i; +}; +struct Q +{ + char c; + [[msvc::no_unique_address]] A8 a; + char d; +}; +int main() +{ + R1 r1; + R2 r2; + __CPROVER_assert( + sizeof(R1) == 8 && (char *)&r1.e - (char *)&r1 == 1, "R1: e at 1"); + __CPROVER_assert( + sizeof(R2) == 8 && (char *)&r2.e - (char *)&r2 == 1, "R2: e at 1"); + __CPROVER_assert( + sizeof(Q) == 8 && __builtin_offsetof(Q, d) == 1, "Q: d at 1"); + __CPROVER_assert(false, "WRONG (must FAIL)"); + return 0; +} diff --git a/regression/cbmc-cpp/cpp20_msvc_no_unique_address_placement/test.desc b/regression/cbmc-cpp/cpp20_msvc_no_unique_address_placement/test.desc new file mode 100644 index 000000000000..91d9ff2062ce --- /dev/null +++ b/regression/cbmc-cpp/cpp20_msvc_no_unique_address_placement/test.desc @@ -0,0 +1,39 @@ +KNOWNBUG +main.cpp +--winx64 +^\[main\.assertion\.1\] line \d+ R1: e at 1: SUCCESS$ +^\[main\.assertion\.2\] line \d+ R2: e at 1: SUCCESS$ +^\[main\.assertion\.3\] line \d+ Q: d at 1: SUCCESS$ +^\[main\.assertion\.4\] line \d+ WRONG \(must FAIL\): FAILURE$ +^\*\* 1 of \d+ failed +^VERIFICATION FAILED$ +^EXIT=10$ +^SIGNAL=0$ +-- +^warning: ignoring +-- +The expected output is clang++ 18's Microsoft ABI layout; no MSVC +compiler was available to check MSVC itself. CBMC lays out +[[msvc::no_unique_address]] members by the Itanium C++ ABI rule used for +[[no_unique_address]] (offset 0, else the data size of the preceding +members, then multiples of the alignment): R1::e is at offset 8, and Q is +16 bytes (see cpp20_no_unique_address_overaligned_empty_member). R2 +matches. The program fails the first and third assertions. + +Not included: clang's Microsoft layout of `struct { E arr[100]; +[[msvc::no_unique_address]] E e; }' puts e at offset 1, the address of +arr[1], an object of the same type; N5008 [intro.object]/10 forbids that. +CBMC puts e at offset 100 (as GCC and Clang do for [[no_unique_address]]) +and should keep doing so. + +Why FUTURE and not KNOWNBUG: both layouts conform to N5008 (the +placement of a potentially-overlapping subobject is implementation- +defined, [intro.object]/8); only the Microsoft ABI's choice is not +matched, and the MSVC STL headers we have (Visual Studio 2022) do not use +the attribute. + +What it would take: in Visual Studio mode, search the candidate offsets +from 0 upwards in steps of the member's alignment +(place_empty_potentially_overlapping_members), still skipping offsets +where a subobject of the same type lies, and give the zero-length array +an alignment of 1 (as for the over-aligned case). diff --git a/regression/cbmc-cpp/cpp20_no_builtin_equality_for_class_operands/main.cpp b/regression/cbmc-cpp/cpp20_no_builtin_equality_for_class_operands/main.cpp new file mode 100644 index 000000000000..0fccf2778ac0 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_no_builtin_equality_for_class_operands/main.cpp @@ -0,0 +1,38 @@ +extern "C" void __CPROVER_assert(bool, const char *); +struct S +{ + int x; +}; +struct with_eq +{ + int x; + bool operator==(const with_eq &o) const + { + return x == o.x; + } +}; +struct convertible +{ + int x; + operator int() const + { + return x; + } +}; +// N5008 [expr.eq]/2, [expr.rel]/2: no built-in equality or relational +// operator takes operands of class type; without an operator function +// ([over.match.oper]/3) `a == b' is ill-formed, so the requirement is not +// satisfied ([expr.prim.req.simple]/1). A conversion function to an +// arithmetic type reaches a built-in candidate ([over.built]). +template +constexpr bool has_eq = requires(const T &a, const T &b) { a == b; }; +template +constexpr bool has_lt = requires(const T &a, const T &b) { a < b; }; +int main() +{ + __CPROVER_assert(!has_eq && !has_lt, "class without operators"); + __CPROVER_assert(has_eq && !has_lt, "operator=="); + __CPROVER_assert(has_eq && has_lt, "conversion"); + __CPROVER_assert(has_eq, "WRONG (must FAIL)"); + return 0; +} diff --git a/regression/cbmc-cpp/cpp20_no_builtin_equality_for_class_operands/test.desc b/regression/cbmc-cpp/cpp20_no_builtin_equality_for_class_operands/test.desc new file mode 100644 index 000000000000..84ad65182333 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_no_builtin_equality_for_class_operands/test.desc @@ -0,0 +1,18 @@ +KNOWNBUG +main.cpp +--cpp20 +^\[main\.assertion\.1\] line \d+ class without operators: SUCCESS$ +^\[main\.assertion\.2\] line \d+ operator==: SUCCESS$ +^\[main\.assertion\.3\] line \d+ conversion: SUCCESS$ +^\[main\.assertion\.4\] line \d+ WRONG \(must FAIL\): FAILURE$ +^VERIFICATION FAILED$ +^EXIT=10$ +^SIGNAL=0$ +-- +^warning: ignoring +^CONVERSION ERROR$ +-- +C's member-wise struct comparison made `a == b' valid for a class without +operator==, so `requires { a == b; }' held. libc++'s equality_comparable, +and with it __cpp17_input_iterator, was then true for an iterator without +operator==, and iterator_traits took the wrong specialization. diff --git a/regression/cbmc-cpp/cpp20_no_unique_address_empty_member_layout/main.cpp b/regression/cbmc-cpp/cpp20_no_unique_address_empty_member_layout/main.cpp new file mode 100644 index 000000000000..cab7aabd9097 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_no_unique_address_empty_member_layout/main.cpp @@ -0,0 +1,108 @@ +// N5008 [dcl.attr.nouniqueaddr]/1, [intro.object]/8, /10: an empty member +// declared [[no_unique_address]] may have zero size and share an address +// with other subobjects, but not with one of the same type. The offsets +// are those of the Itanium C++ ABI (GCC, Clang). Xcode 26's basic_string +// has such a member in __short. +#include +extern "C" void __CPROVER_assert(bool, const char *); +struct E +{ +}; +struct F +{ +}; +struct S1 +{ + char d[3]; + [[no_unique_address]] E e; + char c; +}; +struct S2 +{ + [[no_unique_address]] E e; + int i; +}; +struct S3 +{ + [[no_unique_address]] E a; + [[no_unique_address]] E b; + int i; +}; +struct S4 +{ + [[no_unique_address]] E a; + [[no_unique_address]] F b; + int i; +}; +struct S5 +{ + [[no_unique_address]] E e; +}; +struct S6 +{ + E x; + [[no_unique_address]] E e; + int i; +}; +struct S9 : E +{ + [[no_unique_address]] E e; + int i; +}; +struct S10 +{ + char c; + [[no_unique_address]] E a, b, x; +}; +// Itanium C++ ABI 2.4 II.3: offset 0, else the data size of the members +// before it, then multiples of the alignment +struct R1 +{ + E x; + int i; + [[no_unique_address]] E e; +}; +struct R2 +{ + E x; + [[no_unique_address]] E e; + int i; +}; +struct BigArr +{ + E arr[100]; + [[no_unique_address]] E e; +}; +#define OFF(s, m) ((char *)&s.m - (char *)&s) +int main() +{ + S1 s1; + S2 s2; + S3 s3; + S4 s4; + S6 s6; + S9 s9; + S10 s10; + s1.c = 'c'; + s1.e = E{}; + E copy = s1.e; + __CPROVER_assert( + sizeof(S1) == 4 && OFF(s1, e) == 0 && offsetof(S1, c) == 3, "S1"); + __CPROVER_assert(s1.c == 'c', "storing the member writes nothing"); + __CPROVER_assert(sizeof(S2) == 4 && OFF(s2, e) == 0, "S2"); + __CPROVER_assert(sizeof(S3) == 4 && OFF(s3, a) == 0 && OFF(s3, b) == 1, "S3"); + __CPROVER_assert(sizeof(S4) == 4 && OFF(s4, a) == 0 && OFF(s4, b) == 0, "S4"); + __CPROVER_assert(sizeof(S5) == 1, "S5"); + __CPROVER_assert(sizeof(S6) == 8 && OFF(s6, e) == 1, "S6"); + __CPROVER_assert(sizeof(S9) == 4 && OFF(s9, e) == 1, "S9"); + __CPROVER_assert(sizeof(S10) == 3 && OFF(s10, x) == 2, "S10"); + __CPROVER_assert(sizeof(s1.e) == 1, "sizeof the member"); + R1 r1; + R2 r2; + BigArr b; + __CPROVER_assert(sizeof(R1) == 12 && OFF(r1, e) == 8, "R1"); + __CPROVER_assert(sizeof(R2) == 8 && OFF(r2, e) == 1, "R2"); + __CPROVER_assert(sizeof(BigArr) == 101 && OFF(b, e) == 100, "BigArr"); + __CPROVER_assert(false, "WRONG (must FAIL)"); + return 0; +} diff --git a/regression/cbmc-cpp/cpp20_no_unique_address_empty_member_layout/test.desc b/regression/cbmc-cpp/cpp20_no_unique_address_empty_member_layout/test.desc new file mode 100644 index 000000000000..f5bf2f8e0fda --- /dev/null +++ b/regression/cbmc-cpp/cpp20_no_unique_address_empty_member_layout/test.desc @@ -0,0 +1,31 @@ +KNOWNBUG itanium-abi +main.cpp +--cpp20 +^\[main\.assertion\.1\] line \d+ S1: SUCCESS$ +^\[main\.assertion\.2\] line \d+ storing the member writes nothing: SUCCESS$ +^\[main\.assertion\.3\] line \d+ S2: SUCCESS$ +^\[main\.assertion\.4\] line \d+ S3: SUCCESS$ +^\[main\.assertion\.5\] line \d+ S4: SUCCESS$ +^\[main\.assertion\.6\] line \d+ S5: SUCCESS$ +^\[main\.assertion\.7\] line \d+ S6: SUCCESS$ +^\[main\.assertion\.8\] line \d+ S9: SUCCESS$ +^\[main\.assertion\.9\] line \d+ S10: SUCCESS$ +^\[main\.assertion\.10\] line \d+ sizeof the member: SUCCESS$ +^\[main\.assertion\.11\] line \d+ R1: SUCCESS$ +^\[main\.assertion\.12\] line \d+ R2: SUCCESS$ +^\[main\.assertion\.13\] line \d+ BigArr: SUCCESS$ +^\[main\.assertion\.14\] line \d+ WRONG \(must FAIL\): FAILURE$ +^\*\* 1 of \d+ failed +^VERIFICATION FAILED$ +^EXIT=10$ +^SIGNAL=0$ +-- +^warning: ignoring +static assertion failed +could not be evaluated +-- +An empty member declared [[no_unique_address]] occupied a byte of the class +as any other member: sizeof(S1) was 5, not 4. +Tagged itanium-abi: Visual Studio ignores [[no_unique_address]] (it has +[[msvc::no_unique_address]]), which [intro.object]/8 permits, and so does +cbmc's Visual Studio mode. diff --git a/regression/cbmc-cpp/cpp20_no_unique_address_empty_member_use/main.cpp b/regression/cbmc-cpp/cpp20_no_unique_address_empty_member_use/main.cpp new file mode 100644 index 000000000000..35e66e541f86 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_no_unique_address_empty_member_use/main.cpp @@ -0,0 +1,100 @@ +// N5008 [dcl.attr.nouniqueaddr]/1: an empty [[no_unique_address]] member is +// an object of its class: it is initialized by its constructors +// ([class.base.init]/7), aggregate-initialized, accessed, and named by +// decltype ([dcl.type.decltype]/1.3) as any other member. +#include +#include +#include +extern "C" void __CPROVER_assert(bool, const char *); +int constructed = 0; +int destroyed = 0; +struct D +{ + ~D() + { + ++destroyed; + } +}; +struct WithD +{ + [[no_unique_address]] D d; + int i; +}; +struct E +{ + constexpr int get() const + { + return 7; + } + const E *self() const + { + return this; + } +}; +struct C +{ + C() + { + ++constructed; + } + C(const C &) + { + ++constructed; + } +}; +struct S +{ + char d[3]; + [[no_unique_address]] E e; + char c; +}; +struct T +{ + [[no_unique_address]] C counted; + [[no_unique_address]] E e; + int i; + T() : i(5) + { + } + explicit T(int v) : counted(), e(E{}), i(v) + { + } +}; +template +struct Holder +{ + [[no_unique_address]] A alloc; + int *p; + Holder(A a, int *q) : alloc(std::move(a)), p(q) + { + } +}; +int main() +{ + S s{{'a', 'b', 'c'}, {}, 'd'}; + __CPROVER_assert(sizeof(S) == 4 && s.d[0] == 'a' && s.c == 'd', "aggregate"); + __CPROVER_assert(s.e.get() == 7 && s.e.self() == &s.e, "member call"); + __CPROVER_assert((char *)&s.e == (char *)&s, "at offset 0"); + static_assert(std::is_same::value, "decltype(s.e)"); + static_assert(std::is_same::value, "decltype((s.e))"); + T t; + T u(9); + T w = u; + __CPROVER_assert(sizeof(T) == 4 && t.i == 5 && u.i == 9 && w.i == 9, "T"); + __CPROVER_assert(constructed == 3, "constructors of an empty member run"); + int x = 1; + Holder h(E{}, &x); + __CPROVER_assert(sizeof(h) == sizeof(int *) && *h.p == 1, "Holder"); + __CPROVER_assert(offsetof(S, e) == 0, "offsetof"); + E S::*pm = &S::e; + __CPROVER_assert(&(s.*pm) == &s.e, "pointer to member"); + constexpr S cs{}; + static_assert(cs.e.get() == 7, "constant evaluation"); + { + WithD wd; + wd.i = 1; + } + __CPROVER_assert(destroyed == 1, "destructor of an empty member runs"); + __CPROVER_assert(false, "WRONG (must FAIL)"); + return 0; +} diff --git a/regression/cbmc-cpp/cpp20_no_unique_address_empty_member_use/test.desc b/regression/cbmc-cpp/cpp20_no_unique_address_empty_member_use/test.desc new file mode 100644 index 000000000000..0a4cf95390a5 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_no_unique_address_empty_member_use/test.desc @@ -0,0 +1,28 @@ +KNOWNBUG itanium-abi +main.cpp +--cpp20 +^\[main\.assertion\.1\] line \d+ aggregate: SUCCESS$ +^\[main\.assertion\.2\] line \d+ member call: SUCCESS$ +^\[main\.assertion\.3\] line \d+ at offset 0: SUCCESS$ +^\[main\.assertion\.4\] line \d+ T: SUCCESS$ +^\[main\.assertion\.5\] line \d+ constructors of an empty member run: SUCCESS$ +^\[main\.assertion\.6\] line \d+ Holder: SUCCESS$ +^\[main\.assertion\.7\] line \d+ offsetof: SUCCESS$ +^\[main\.assertion\.8\] line \d+ pointer to member: SUCCESS$ +^\[main\.assertion\.9\] line \d+ destructor of an empty member runs: SUCCESS$ +^\[main\.assertion\.10\] line \d+ WRONG \(must FAIL\): FAILURE$ +^\*\* 1 of \d+ failed +^VERIFICATION FAILED$ +^EXIT=10$ +^SIGNAL=0$ +-- +^warning: ignoring +static assertion failed +could not be evaluated +-- +The member had no zero-size layout before; this checks that its +initialization, aggregate initialization, member calls and decltype work +with the layout that gives it zero size. +Tagged itanium-abi: Visual Studio ignores [[no_unique_address]] (it has +[[msvc::no_unique_address]]), which [intro.object]/8 permits, and so does +cbmc's Visual Studio mode. diff --git a/regression/cbmc-cpp/cpp20_no_unique_address_later_member_of_same_type/main.cpp b/regression/cbmc-cpp/cpp20_no_unique_address_later_member_of_same_type/main.cpp new file mode 100644 index 000000000000..924e9b5f616d --- /dev/null +++ b/regression/cbmc-cpp/cpp20_no_unique_address_later_member_of_same_type/main.cpp @@ -0,0 +1,24 @@ +// N5008 [intro.object]/10: an empty [[no_unique_address]] member and a +// later member of the same type have distinct addresses. GCC and Clang +// (Itanium C++ ABI 2.4 II) allocate in declaration order: e takes offset +// 0, and x, which would conflict there, moves to offset 1. +extern "C" void __CPROVER_assert(bool, const char *); +struct E +{ +}; +struct L +{ + [[no_unique_address]] E e; + E x; + int i; +}; +int main() +{ + L l; + __CPROVER_assert((char *)&l.e != (char *)&l.x, "distinct addresses"); + __CPROVER_assert((char *)&l.e == (char *)&l, "e at offset 0"); + __CPROVER_assert((char *)&l.x == (char *)&l + 1, "x at offset 1"); + __CPROVER_assert(sizeof(L) == 8, "size"); + __CPROVER_assert(false, "WRONG (must FAIL)"); + return 0; +} diff --git a/regression/cbmc-cpp/cpp20_no_unique_address_later_member_of_same_type/test.desc b/regression/cbmc-cpp/cpp20_no_unique_address_later_member_of_same_type/test.desc new file mode 100644 index 000000000000..7f1fe95be110 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_no_unique_address_later_member_of_same_type/test.desc @@ -0,0 +1,33 @@ +KNOWNBUG +main.cpp +--cpp20 +^\[main\.assertion\.1\] line \d+ distinct addresses: SUCCESS$ +^\[main\.assertion\.2\] line \d+ e at offset 0: SUCCESS$ +^\[main\.assertion\.3\] line \d+ x at offset 1: SUCCESS$ +^\[main\.assertion\.4\] line \d+ size: SUCCESS$ +^\[main\.assertion\.5\] line \d+ WRONG \(must FAIL\): FAILURE$ +^\*\* 1 of \d+ failed +^VERIFICATION FAILED$ +^EXIT=10$ +^SIGNAL=0$ +-- +^warning: ignoring +-- +The expected output is that of g++ 13 and clang++ 18. CBMC places the +ordinary members first, at their sequential offsets, and the empty +[[no_unique_address]] members afterwards where no subobject of the same +type lies (place_empty_potentially_overlapping_members): x is at offset 0 +and e at offset 1. The program fails the second and third assertions. + +Why FUTURE and not KNOWNBUG: the addresses are distinct, as +[intro.object]/10 requires, and the size is the same; which of the two +objects gets which offset is implementation-defined. Only the Itanium +C++ ABI's choice is not matched. + +What it would take: allocate in declaration order, moving an ordinary +member (and the members after it) when it conflicts with an empty +member allocated before it. The ordinary members' offsets come from +add_padding, which knows nothing of the empty members, so this needs the +conflict-driven placement of ordinary members as well (Itanium 2.4 II.2: +"Place D at this offset unless doing so would result in two components +of the same type having the same offset"). diff --git a/regression/cbmc-cpp/cpp20_no_unique_address_layout/main.cpp b/regression/cbmc-cpp/cpp20_no_unique_address_layout/main.cpp new file mode 100644 index 000000000000..199eaed70943 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_no_unique_address_layout/main.cpp @@ -0,0 +1,18 @@ +// N5008 [dcl.attr.nouniqueaddr]/2, [intro.object]/8, 10: a non-static data +// member with [[no_unique_address]] of an empty class type need not have +// a distinct address; g++ and clang++ (Itanium C++ ABI) give it none, so +// sizeof(S) == sizeof(int). +extern "C" void __CPROVER_assert(bool, const char *); +struct E +{ +}; +struct S +{ + [[no_unique_address]] E e; + int x; +}; +int main() +{ + __CPROVER_assert(sizeof(S) == sizeof(int), "no_unique_address"); + __CPROVER_assert(false, "WRONG (must FAIL)"); +} diff --git a/regression/cbmc-cpp/cpp20_no_unique_address_layout/test.desc b/regression/cbmc-cpp/cpp20_no_unique_address_layout/test.desc new file mode 100644 index 000000000000..bb36c6ed6871 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_no_unique_address_layout/test.desc @@ -0,0 +1,17 @@ +KNOWNBUG itanium-abi +main.cpp +--cpp20 +^\[main\.assertion\.1\] .* no_unique_address: SUCCESS$ +^\[main\.assertion\.2\] .* WRONG \(must FAIL\): FAILURE$ +^VERIFICATION FAILED$ +^EXIT=10$ +^SIGNAL=0$ +-- +^warning: ignoring +^CONVERSION ERROR$ +-- +The front end ignored the attribute and laid out the empty member as a +byte, so sizeof(S) was 8. +Tagged itanium-abi: Visual Studio ignores [[no_unique_address]] (it has +[[msvc::no_unique_address]]), which [intro.object]/8 permits, and so does +cbmc's Visual Studio mode. diff --git a/regression/cbmc-cpp/cpp20_no_unique_address_member_of_base/main.cpp b/regression/cbmc-cpp/cpp20_no_unique_address_member_of_base/main.cpp new file mode 100644 index 000000000000..efc57b3e26a8 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_no_unique_address_member_of_base/main.cpp @@ -0,0 +1,51 @@ +// N5008 [meta.unary.prop]/5: a class whose only non-static data member is +// an empty [[no_unique_address]] member (a subobject of zero size, +// [intro.object]/8) is empty; as a base it has zero size and, as GCC and +// Clang (Itanium C++ ABI 2.4 II.3) lay it out, lies at offset 0. A +// non-empty base with such a member keeps the member's offset in the base. +#include +extern "C" void __CPROVER_assert(bool, const char *); +struct E +{ +}; +struct H +{ + [[no_unique_address]] E e; +}; +struct I +{ + int i; +}; +struct T : I, H +{ +}; +struct K +{ + int k; + [[no_unique_address]] E e; +}; +struct U : I, K +{ +}; +static_assert(std::is_empty::value, "is_empty"); + +int main() +{ + T t; + t.i = 3; + H &h = t; + E &e = h.e; + e = E{}; + E copy(h.e); + (void)copy; + __CPROVER_assert(sizeof(T) == sizeof(int), "empty base"); + __CPROVER_assert( + (char *)&h == (char *)&t && (char *)&e == (char *)&t, "at offset 0"); + __CPROVER_assert(t.i == 3, "storing the member writes nothing"); + U u; + __CPROVER_assert( + sizeof(U) == 2 * sizeof(int) && (char *)&u.e - (char *)&u == sizeof(int), + "member of a non-empty base"); + __CPROVER_assert(false, "WRONG (must FAIL)"); + return 0; +} diff --git a/regression/cbmc-cpp/cpp20_no_unique_address_member_of_base/test.desc b/regression/cbmc-cpp/cpp20_no_unique_address_member_of_base/test.desc new file mode 100644 index 000000000000..47ff53e09a17 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_no_unique_address_member_of_base/test.desc @@ -0,0 +1,22 @@ +KNOWNBUG itanium-abi +main.cpp +--cpp20 +^\[main\.assertion\.1\] line \d+ empty base: SUCCESS$ +^\[main\.assertion\.2\] line \d+ at offset 0: SUCCESS$ +^\[main\.assertion\.3\] line \d+ storing the member writes nothing: SUCCESS$ +^\[main\.assertion\.4\] line \d+ member of a non-empty base: SUCCESS$ +^\[main\.assertion\.5\] line \d+ WRONG \(must FAIL\): FAILURE$ +^\*\* 1 of \d+ failed +^VERIFICATION FAILED$ +^EXIT=10$ +^SIGNAL=0$ +-- +^warning: ignoring +static assertion failed +-- +H was not empty (is_empty, and as a base), and the member of a base kept +its offset within the base: T was 8 bytes with H at offset 4, its end, so +copying h.e read past the end of t. +Tagged itanium-abi: Visual Studio ignores [[no_unique_address]] (it has +[[msvc::no_unique_address]]), which [intro.object]/8 permits, and so does +cbmc's Visual Studio mode. diff --git a/regression/cbmc-cpp/cpp20_no_unique_address_overaligned_empty_member/main.cpp b/regression/cbmc-cpp/cpp20_no_unique_address_overaligned_empty_member/main.cpp new file mode 100644 index 000000000000..c827c3cd1e16 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_no_unique_address_overaligned_empty_member/main.cpp @@ -0,0 +1,24 @@ +// N5008 [dcl.attr.nouniqueaddr]/1, [intro.object]/8: an empty +// [[no_unique_address]] member of an over-aligned class. GCC and Clang +// (Itanium C++ ABI 2.4 II.3) put it at offset 0, so d follows c at offset +// 1; the member only raises the class's alignment to 8. +#include +extern "C" void __CPROVER_assert(bool, const char *); +struct alignas(8) A8 +{ +}; +struct Q +{ + char c; + [[no_unique_address]] A8 a; + char d; +}; +int main() +{ + Q q; + __CPROVER_assert((char *)&q.a == (char *)&q, "at offset 0"); + __CPROVER_assert(offsetof(Q, d) == 1, "d follows c"); + __CPROVER_assert(sizeof(Q) == 8 && alignof(Q) == 8, "size 8"); + __CPROVER_assert(false, "WRONG (must FAIL)"); + return 0; +} diff --git a/regression/cbmc-cpp/cpp20_no_unique_address_overaligned_empty_member/test.desc b/regression/cbmc-cpp/cpp20_no_unique_address_overaligned_empty_member/test.desc new file mode 100644 index 000000000000..1e0e0b1179aa --- /dev/null +++ b/regression/cbmc-cpp/cpp20_no_unique_address_overaligned_empty_member/test.desc @@ -0,0 +1,29 @@ +KNOWNBUG +main.cpp +--cpp20 +^\[main\.assertion\.1\] line \d+ at offset 0: SUCCESS$ +^\[main\.assertion\.2\] line \d+ d follows c: SUCCESS$ +^\[main\.assertion\.3\] line \d+ size 8: SUCCESS$ +^\[main\.assertion\.4\] line \d+ WRONG \(must FAIL\): FAILURE$ +^\*\* 1 of \d+ failed +^VERIFICATION FAILED$ +^EXIT=10$ +^SIGNAL=0$ +-- +^warning: ignoring +-- +The expected output is that of g++ 13 and clang++ 18. CBMC places the +member at offset 0 too, but keeps it in the sequence of the components as +a zero-length array of A8 (make_empty_potentially_overlapping_members_ +zero_sized), which add_padding aligns to 8: d moves to offset 8 and +sizeof(Q) is 16. The program fails the second and third assertions. + +Why FUTURE and not KNOWNBUG: the layout conforms to N5008 (the size and +the offsets of members are implementation-defined, [intro.object]/8, +[class.mem.general]); only GCC's and Clang's Itanium C++ ABI layout is not +matched. + +What it would take: give the zero-length array component an alignment of +1 (so that it does not pad the sequence) while the class keeps the +member's alignment, e.g. by recording it as the class's ID_C_alignment; +or not keep the member among the sequential components at all. diff --git a/regression/cbmc-cpp/cpp20_no_unique_address_tail_padding_reuse/main.cpp b/regression/cbmc-cpp/cpp20_no_unique_address_tail_padding_reuse/main.cpp new file mode 100644 index 000000000000..23faa14ee5e5 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_no_unique_address_tail_padding_reuse/main.cpp @@ -0,0 +1,52 @@ +// N5008 [dcl.attr.nouniqueaddr]/2 (note): the padding that would +// normally be inserted at the end of a [[no_unique_address]] member may be +// reused by other members. GCC and Clang (Itanium C++ ABI 2.4 II.2) do so +// for a member of a class that is not POD for the purpose of layout: the +// data size (dsize) of O is 5, and P's c follows at offset 5. +#include +extern "C" void __CPROVER_assert(bool, const char *); +struct O +{ + int i; + char c; + O() : i(0), c(0) + { + } +}; +struct OP +{ + int i; + char c; +}; +struct P +{ + [[no_unique_address]] O o; + char c; +}; +struct PP +{ + [[no_unique_address]] OP o; + char c; +}; +// libc++'s __datasizeof_v<_Tp> (Xcode 26, libc++ 19 and later) measures +// the data size this way and sizes the padding of __compressed_pair by it +template +struct first_padding_byte +{ + [[no_unique_address]] T v; + char first_padding_byte_; +}; +int main() +{ + P p; + p.c = 'x'; + p.o.c = 'y'; + __CPROVER_assert(sizeof(P) == 8 && offsetof(P, c) == 5, "tail reused"); + __CPROVER_assert(p.c == 'x' && p.o.c == 'y', "distinct bytes"); + __CPROVER_assert( + offsetof(first_padding_byte, first_padding_byte_) == 5, "dsize(O)"); + // a POD member's tail padding is not reused (Itanium C++ ABI 2.2) + __CPROVER_assert(sizeof(PP) == 12 && offsetof(PP, c) == 8, "POD member"); + __CPROVER_assert(false, "WRONG (must FAIL)"); + return 0; +} diff --git a/regression/cbmc-cpp/cpp20_no_unique_address_tail_padding_reuse/test.desc b/regression/cbmc-cpp/cpp20_no_unique_address_tail_padding_reuse/test.desc new file mode 100644 index 000000000000..32ce868d5a01 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_no_unique_address_tail_padding_reuse/test.desc @@ -0,0 +1,43 @@ +KNOWNBUG +main.cpp +--cpp20 +^\[main\.assertion\.1\] line \d+ tail reused: SUCCESS$ +^\[main\.assertion\.2\] line \d+ distinct bytes: SUCCESS$ +^\[main\.assertion\.3\] line \d+ dsize\(O\): SUCCESS$ +^\[main\.assertion\.4\] line \d+ POD member: SUCCESS$ +^\[main\.assertion\.5\] line \d+ WRONG \(must FAIL\): FAILURE$ +^\*\* 1 of \d+ failed +^VERIFICATION FAILED$ +^EXIT=10$ +^SIGNAL=0$ +-- +^warning: ignoring +-- +The expected output is that of g++ 13 and clang++ 18. CBMC lays out a +non-empty [[no_unique_address]] member as any other member: sizeof(P) is +12 and P::c is at offset 8, and offsetof(first_padding_byte, ...) is 8, +so the program fails the first and third assertions. + +Why FUTURE and not KNOWNBUG: CBMC's layout conforms to N5008. Whether a +potentially-overlapping subobject overlaps anything is +implementation-defined ([intro.object]/8; [dcl.attr.nouniqueaddr]/2 is a +note saying the padding "can" be reused), and every object here keeps +storage disjoint from every other ([intro.object]/10). What CBMC does not +match is the Itanium C++ ABI that GCC and Clang implement. + +What it would take: CBMC's struct type has no notion of two components +sharing bytes, so reusing the tail padding needs P::c to sit inside +the bytes of P::o. The empty-member support (cpp_typecheck_compound_type, +make_empty_potentially_overlapping_members_zero_sized) avoids that by +giving the member no bytes and reaching it through `*(T *)((char *)&x + +offset)'; a non-empty member has bytes, so either the member would be +cut to its dsize (an array of dsize bytes, reached the same way, with its +tail padding left to the following members) or the following members +would be reached at their ABI offsets. dsize itself would have to be +computed per class (the size without tail padding, Itanium 2.4 II). +Also needed for base classes: CBMC already gives D : B (B non-POD with +tail padding) the ABI size, by flattening. + +Consequences of the gap: sizeof and offsetof of such classes differ from +GCC and Clang, and libc++'s __compressed_pair (Xcode 26) pads a stateful +element of such a type differently; that changes layouts, not results. diff --git a/regression/cbmc-cpp/cpp20_nontype_pack_spec_multi/main.cpp b/regression/cbmc-cpp/cpp20_nontype_pack_spec_multi/main.cpp new file mode 100644 index 000000000000..72b5acd259a5 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_nontype_pack_spec_multi/main.cpp @@ -0,0 +1,38 @@ +// libc++ __bind_back_op shape (the pipe's invoke chain): +// template > +// struct __bind_back_op; +// template +// struct __bind_back_op<_NBound, index_sequence<_Ip...>> { ... }; +// Three N5008-grounded ingredients, each formerly broken: +// * [basic.scope.pdecl]/12: the defaulted second parameter references the +// preceding NON-TYPE parameter (preceding expression parameters +// were not bound when the default was materialized); +// * [intseq.make]: the clang builtin __make_integer_seq used BARE as +// a type (the resolve_scope intercept only covered qualified uses); +// * [temp.variadic]/9: a nested non-type pack pattern deduced to TWO +// or more values -- per-element substitution went through the +// scalar convenience entry, so `integer_sequence` +// substituted to `` and the specialization never matched. +// clang builtins => CLANG mode; clang++ runs this clean. +extern "C" void __CPROVER_assert(bool, const char *); +template +struct integer_sequence +{ +}; +template +using index_sequence = integer_sequence; +template +using make_index_sequence = + __make_integer_seq; +template > +struct __bind_back_op; +template +struct __bind_back_op<_NBound, integer_sequence> +{ + static const int value = 1 + sizeof...(_Ip); +}; +int main() +{ + __CPROVER_assert(__bind_back_op<2>::value == 3, "defaulted seq param"); + return 0; +} diff --git a/regression/cbmc-cpp/cpp20_nontype_pack_spec_multi/test.desc b/regression/cbmc-cpp/cpp20_nontype_pack_spec_multi/test.desc new file mode 100644 index 000000000000..09db60f5869d --- /dev/null +++ b/regression/cbmc-cpp/cpp20_nontype_pack_spec_multi/test.desc @@ -0,0 +1,11 @@ +KNOWNBUG libcxx +main.cpp +--cpp20 --stdlib libc++ +^\[main\.assertion\.1\] line \d+ defaulted seq param: SUCCESS$ +^VERIFICATION SUCCESSFUL$ +^EXIT=0$ +^SIGNAL=0$ +-- +dropped the body +-- +Fixed 2026-08-04 (round 11, third fix batch). diff --git a/regression/cbmc-cpp/cpp20_nontype_template_parameter_pack_of_qualified_type/main.cpp b/regression/cbmc-cpp/cpp20_nontype_template_parameter_pack_of_qualified_type/main.cpp new file mode 100644 index 000000000000..fd875e90d441 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_nontype_template_parameter_pack_of_qualified_type/main.cpp @@ -0,0 +1,27 @@ +extern "C" void __CPROVER_assert(bool, const char *); +namespace N +{ +typedef unsigned long size_type; +} +// N5008 [temp.param]/1, [temp.variadic]/1: `N::size_type... I' declares a +// non-type template parameter pack of a qualified type (`std::size_t... +// I' in user code, preprocessed with the MSVC STL) +template +struct indices +{ + static constexpr int count = sizeof...(I); +}; +template +struct tagged +{ + static constexpr int count = sizeof...(I); +}; +int main() +{ + __CPROVER_assert( + indices<0, 1>::count == 2 && tagged::count == 3 && + indices<>::count == 0, + "packs of a qualified type"); + __CPROVER_assert(indices<0, 1>::count == 1, "WRONG (must FAIL)"); + return 0; +} diff --git a/regression/cbmc-cpp/cpp20_nontype_template_parameter_pack_of_qualified_type/test.desc b/regression/cbmc-cpp/cpp20_nontype_template_parameter_pack_of_qualified_type/test.desc new file mode 100644 index 000000000000..38a1a7f33ba7 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_nontype_template_parameter_pack_of_qualified_type/test.desc @@ -0,0 +1,18 @@ +KNOWNBUG +main.cpp +--cpp20 +^\[main\.assertion\.1\] line \d+ packs of a qualified type: SUCCESS$ +^\[main\.assertion\.2\] line \d+ WRONG \(must FAIL\): FAILURE$ +^VERIFICATION FAILED$ +^EXIT=10$ +^SIGNAL=0$ +-- +^warning: ignoring +^CONVERSION ERROR$ +too many template arguments +-- +With concepts enabled (C++20, or the MSVC STL in Visual Studio mode) a +template parameter beginning with a qualified name is parsed by the +concept-aware path; it moved the ellipsis of a pointer declarator to the +declarator-id but not that of a plain one, so `N::size_type... I' was a +single parameter. diff --git a/regression/cbmc-cpp/cpp20_nttp_float/main.cpp b/regression/cbmc-cpp/cpp20_nttp_float/main.cpp new file mode 100644 index 000000000000..1a0198b9c131 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_nttp_float/main.cpp @@ -0,0 +1,12 @@ +// C++20 floating-point non-type template parameter +template +struct Const +{ + static constexpr double value = V; +}; + +int main() +{ + __CPROVER_assert(Const<3.14>::value > 3.0, "float nttp"); + return 0; +} diff --git a/regression/cbmc-cpp/cpp20_nttp_float/test.desc b/regression/cbmc-cpp/cpp20_nttp_float/test.desc new file mode 100644 index 000000000000..3db40862133b --- /dev/null +++ b/regression/cbmc-cpp/cpp20_nttp_float/test.desc @@ -0,0 +1,10 @@ +KNOWNBUG +main.cpp +--cpp20 +^VERIFICATION SUCCESSFUL$ +^EXIT=0$ +^SIGNAL=0$ +-- +dropped the body +-- +C++20 floating-point NTTP: float template args not recognized as scalar constants diff --git a/regression/cbmc-cpp/cpp20_nttp_string/main.cpp b/regression/cbmc-cpp/cpp20_nttp_string/main.cpp new file mode 100644 index 000000000000..2abdde6f51b1 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_nttp_string/main.cpp @@ -0,0 +1,19 @@ +// C++20 class type as non-type template parameter +struct Fixed +{ + int value; + constexpr Fixed(int v) : value(v) + { + } +}; +template +int get() +{ + return F.value; +} +int main() +{ + int r = get(); + __CPROVER_assert(r == 42, "class NTTP"); + return 0; +} diff --git a/regression/cbmc-cpp/cpp20_nttp_string/test.desc b/regression/cbmc-cpp/cpp20_nttp_string/test.desc new file mode 100644 index 000000000000..e2c448e59c26 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_nttp_string/test.desc @@ -0,0 +1,16 @@ +KNOWNBUG +main.cpp +--cpp20 +^VERIFICATION SUCCESSFUL$ +^EXIT=0$ +^SIGNAL=0$ +-- +dropped the body +-- +Was KNOWNBUG since round 152 ("expected constant expression, but got +'<>'"). Fixed 2026-09-24: the constant evaluator folds a +constexpr constructor call on a temporary into a struct constant +([expr.const]/22, [class.base.init]), the template argument list and the +instance's template map carry that constant ([temp.arg.nontype]/1, +[temp.param]/12), and the instance identifier renders it flat +([temp.type]/1). diff --git a/regression/cbmc-cpp/cpp20_numbers_basic/main.cpp b/regression/cbmc-cpp/cpp20_numbers_basic/main.cpp new file mode 100644 index 000000000000..82810167ff55 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_numbers_basic/main.cpp @@ -0,0 +1,14 @@ +#if !defined(_MSC_VER) && __has_include() +// C++20 std::numbers +# include +int main() +{ + constexpr double pi = std::numbers::pi; + __CPROVER_assert(pi > 3.14 && pi < 3.15, "pi"); +} + +#else +int main() +{ +} +#endif diff --git a/regression/cbmc-cpp/cpp20_numbers_basic/test.desc b/regression/cbmc-cpp/cpp20_numbers_basic/test.desc new file mode 100644 index 000000000000..3f28b38105a0 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_numbers_basic/test.desc @@ -0,0 +1,9 @@ +KNOWNBUG +main.cpp +--cpp20 +^EXIT=0$ +^SIGNAL=0$ +^VERIFICATION SUCCESSFUL$ +-- +dropped the body +-- diff --git a/regression/cbmc-cpp/cpp20_numeric_basic/main.cpp b/regression/cbmc-cpp/cpp20_numeric_basic/main.cpp new file mode 100644 index 000000000000..f1850b653e91 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_numeric_basic/main.cpp @@ -0,0 +1,8 @@ +// C++20 header +#include +int main() +{ + int arr[] = {1, 2, 3, 4, 5}; + int sum = std::accumulate(arr, arr + 5, 0); + __CPROVER_assert(sum == 15, "accumulate"); +} diff --git a/regression/cbmc-cpp/cpp20_numeric_basic/test.desc b/regression/cbmc-cpp/cpp20_numeric_basic/test.desc new file mode 100644 index 000000000000..364d916d224e --- /dev/null +++ b/regression/cbmc-cpp/cpp20_numeric_basic/test.desc @@ -0,0 +1,9 @@ +KNOWNBUG +main.cpp +--cpp20 +^VERIFICATION SUCCESSFUL$ +^EXIT=0$ +^SIGNAL=0$ +-- +dropped the body +-- diff --git a/regression/cbmc-cpp/cpp20_numeric_basic_libcxx/main.cpp b/regression/cbmc-cpp/cpp20_numeric_basic_libcxx/main.cpp new file mode 100644 index 000000000000..f1850b653e91 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_numeric_basic_libcxx/main.cpp @@ -0,0 +1,8 @@ +// C++20 header +#include +int main() +{ + int arr[] = {1, 2, 3, 4, 5}; + int sum = std::accumulate(arr, arr + 5, 0); + __CPROVER_assert(sum == 15, "accumulate"); +} diff --git a/regression/cbmc-cpp/cpp20_numeric_basic_libcxx/test.desc b/regression/cbmc-cpp/cpp20_numeric_basic_libcxx/test.desc new file mode 100644 index 000000000000..ea83d7ba8e93 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_numeric_basic_libcxx/test.desc @@ -0,0 +1,11 @@ +KNOWNBUG libcxx +main.cpp +--cpp20 --stdlib libc++ +^VERIFICATION +^EXIT=(0|10)$ +^SIGNAL=0$ +-- +^PARSING ERROR$ +-- +libc++ CONVERSION ERROR: incomplete type, missing symbol, or +implicit conversion failure. diff --git a/regression/cbmc-cpp/cpp20_optional_base_alias_unknown/main.cpp b/regression/cbmc-cpp/cpp20_optional_base_alias_unknown/main.cpp new file mode 100644 index 000000000000..b61c2bd81207 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_optional_base_alias_unknown/main.cpp @@ -0,0 +1,55 @@ +// Minimal faithful shape of libc++ 's enable-if constructor +// pair (round-11 rewrite of the earlier degenerate reduction): +// * TWO member constructor templates with the SAME function signature +// `(_Up&&)`, differing only in their second template parameter (a +// deduced-class-type NTTP `enable_if_t` vs a dependent +// `enable_if_t<_Up::__enable_explicit>`) -- N5008 [temp.inst]/3.1: +// instantiating optional instantiates only their DECLARATIONS, +// in which `_Up`-dependent constructs stay dependent, so `_Up` must +// remain resolvable as a template parameter. +// * the member alias `__base` for the dependent base (whose bool NTTP +// default evaluates builtin traits over a builtin alias type, +// [temp.local] injected-class-name without an argument list) used in +// a ctor mem-initializer. +// clang builtins (__add_rvalue_reference et al.) => CLANG mode +// (--stdlib libc++); clang++ accepts and runs this clean. +extern "C" void __CPROVER_assert(bool, const char *); + +template +struct enable_if; +template +using enable_if_t = enable_if<_Bp>; +template +struct integral_constant +{ + static const int value = __v; +}; +template +using __add_rvalue_reference_t = __add_rvalue_reference(_Tp); +template < + bool = integral_constant<__is_trivially_constructible( + __add_rvalue_reference_t)>::value> +struct __optional_move_assign_base +{ + int __val_ = 7; +}; +template +struct optional : __optional_move_assign_base<> +{ + using __base = __optional_move_assign_base; + optional() : __base() + { + } + template + optional(_Up &&); + template > + optional(_Up &&) : __base() + { + } +}; +int main() +{ + optional o; + __CPROVER_assert(o.__val_ == 7, "base subobject initialized"); + return 0; +} diff --git a/regression/cbmc-cpp/cpp20_optional_base_alias_unknown/test.desc b/regression/cbmc-cpp/cpp20_optional_base_alias_unknown/test.desc new file mode 100644 index 000000000000..6ac74ad1adad --- /dev/null +++ b/regression/cbmc-cpp/cpp20_optional_base_alias_unknown/test.desc @@ -0,0 +1,20 @@ +KNOWNBUG libcxx +main.cpp +--cpp20 --stdlib libc++ +^\[main\.assertion\.1\] line \d+ base subobject initialized: SUCCESS$ +^VERIFICATION SUCCESSFUL$ +^EXIT=0$ +^SIGNAL=0$ +-- +dropped the body +-- +libc++ enable-if ctor-pair shape: same-signature member ctor +templates collide on their symbol identifier; the collision branches of +convert_function_template returned WITHOUT making the template scope a +secondary scope of the class scope, so the constructor pass's typecheck +of the dependent NTTP type failed "symbol '_Up' is unknown" and the +whole instantiation was abandoned (main silently dropped). Fixed +2026-08-04 (round 11) by registering the scope exactly as the +'#sfinae_alt' twin branch already did. History: earlier degenerate +38-line reduction gated on this same family; replaced by this faithful +minimal shape per the round-9 re-scoping note. diff --git a/regression/cbmc-cpp/cpp20_optional_basic/main.cpp b/regression/cbmc-cpp/cpp20_optional_basic/main.cpp new file mode 100644 index 000000000000..3e67fbee14ad --- /dev/null +++ b/regression/cbmc-cpp/cpp20_optional_basic/main.cpp @@ -0,0 +1,8 @@ +// C++20 std::optional +#include +int main() +{ + std::optional o = 42; + __CPROVER_assert(o.has_value(), "has value"); + __CPROVER_assert(*o == 42, "value"); +} diff --git a/regression/cbmc-cpp/cpp20_optional_basic/test.desc b/regression/cbmc-cpp/cpp20_optional_basic/test.desc new file mode 100644 index 000000000000..77250251ad90 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_optional_basic/test.desc @@ -0,0 +1,24 @@ +KNOWNBUG +main.cpp +--cpp20 --show-goto-functions +^EXIT=0$ +^SIGNAL=0$ +^.*std::(__1::)?optional::optional\(this,rref_signed_int\).*$ +-- +^CONVERSION ERROR$ +^PARSING ERROR$ +dropped the body +-- +C++20 std::optional copy-initialization from a value +(`std::optional o = 42;`). + +This verifies the frontend selects std::optional's converting +constructor `optional(_Up&&)` and constructs the contained value. + +Verified at the goto-program level rather than via full BMC: a +correctly-elaborated `std::optional` pulls in the entire +`_Optional_base`/`_Optional_payload` instantiation graph, which +exceeds symbolic-execution memory limits (this is why the C++17 +counterpart, cpp17_optional_basic, is also checked at the goto +level). The goto-level check confirms the converting constructor +is actually invoked with the `int&&` value. diff --git a/regression/cbmc-cpp/cpp20_optional_basic/test_libcxx.desc b/regression/cbmc-cpp/cpp20_optional_basic/test_libcxx.desc new file mode 100644 index 000000000000..3a558dcaab2d --- /dev/null +++ b/regression/cbmc-cpp/cpp20_optional_basic/test_libcxx.desc @@ -0,0 +1,11 @@ +KNOWNBUG libcxx libcxx-slow +main.cpp +--cpp20 --stdlib libc++ +^VERIFICATION +^EXIT=(0|10)$ +^SIGNAL=0$ +-- +^PARSING ERROR$ +^CONVERSION ERROR$ +-- +libc++ C++20 optional BMC solving is too slow for CI. diff --git a/regression/cbmc-cpp/cpp20_out_of_class_constrained_member_function_template_overloads/main.cpp b/regression/cbmc-cpp/cpp20_out_of_class_constrained_member_function_template_overloads/main.cpp new file mode 100644 index 000000000000..52d8e67aae8c --- /dev/null +++ b/regression/cbmc-cpp/cpp20_out_of_class_constrained_member_function_template_overloads/main.cpp @@ -0,0 +1,47 @@ +// N5008 [temp.over.link]/6, [temp.mem]/1: the two member function +// templates f differ only in their requires-clauses; each out-of-class +// definition defines the declaration with the equivalent template-head. +// The second definition renames the template parameters ([temp.over.link]/6: +// equivalent up to renaming). The definitions were attached by name, +// parameter count and cv-qualification alone, so s.f(1.0) ran the first +// definition. +extern "C" void __CPROVER_assert(bool, const char *); +template +concept small = sizeof(T) <= 4; +template +concept big = sizeof(T) > 4; +template + requires small +struct S +{ + template + requires small + int f(U); + template + requires big + int f(U); +}; +template + requires small +template + requires small +int S::f(U) +{ + return 1; +} +template + requires small +template + requires big +int S::f(V) +{ + return 2; +} +int main() +{ + S s; + __CPROVER_assert(s.f('a') == 1, "small"); + __CPROVER_assert(s.f(1.0) == 2, "big"); + __CPROVER_assert(false, "WRONG (must FAIL)"); + return 0; +} diff --git a/regression/cbmc-cpp/cpp20_out_of_class_constrained_member_function_template_overloads/test.desc b/regression/cbmc-cpp/cpp20_out_of_class_constrained_member_function_template_overloads/test.desc new file mode 100644 index 000000000000..80dd2870acca --- /dev/null +++ b/regression/cbmc-cpp/cpp20_out_of_class_constrained_member_function_template_overloads/test.desc @@ -0,0 +1,14 @@ +KNOWNBUG +main.cpp +--cpp20 +^\[main\.assertion\.1\] .* small: SUCCESS$ +^\[main\.assertion\.2\] .* big: SUCCESS$ +^\[main\.assertion\.3\] .* WRONG \(must FAIL\): FAILURE$ +^VERIFICATION FAILED$ +^EXIT=10$ +^SIGNAL=0$ +-- +^warning: ignoring +-- +g++ 13 and clang++ 18 accept this program, and it fails only its WRONG +assertion. diff --git a/regression/cbmc-cpp/cpp20_pack_expansion_in_call_with_class_pack/main.cpp b/regression/cbmc-cpp/cpp20_pack_expansion_in_call_with_class_pack/main.cpp new file mode 100644 index 000000000000..784c5dd58c8d --- /dev/null +++ b/regression/cbmc-cpp/cpp20_pack_expansion_in_call_with_class_pack/main.cpp @@ -0,0 +1,58 @@ +// N5008 [temp.variadic]/8: two pack expansions in one call argument list +// -- the member's own function parameter pack and the ENCLOSING CLASS +// template's non-type pack -- must expand independently: +// `Op()(static_cast(a)..., get(bound_)...)`, the libc++ +// __perfect_forward / __bind_back_op shape behind the ranges pipe. +// CBMC mis-converts the constructor's mem-initializer for the +// pack-typed member ("invalid implicit conversion from 'signed int' to +// 'struct tup'"), so the constructor body is dropped and the bound value +// reads garbage. The FOLD form of the same shape is fixed +// (cpp20_fold_over_class_pack_in_member); this is the call-argument +// expansion form. +// g++ and clang++ both accept and run clean. +extern "C" void __CPROVER_assert(bool, const char *); +template +struct iseq +{ +}; +template +struct tup +{ + T v_; +}; +template +T get(tup t) +{ + return t.v_; +} +// bound args held in a BASE subobject (libc++ __perfect_forward shape) +template +struct pf_impl; +template +struct pf_impl, B...> +{ + tup bound_; + pf_impl(B... b) : bound_{b...} + { + } + template + auto operator()(A &&...a) + { + return Op()(static_cast(a)..., get(bound_)...); + } +}; + +struct taker +{ + int operator()(int (&arr)[1], int n) + { + return arr[0] + n; + } +}; +int main() +{ + int arr[1]{5}; + pf_impl, int> c(3); + __CPROVER_assert(c(arr) == 8, "base-held bound args expansion"); + return 0; +} diff --git a/regression/cbmc-cpp/cpp20_pack_expansion_in_call_with_class_pack/test.desc b/regression/cbmc-cpp/cpp20_pack_expansion_in_call_with_class_pack/test.desc new file mode 100644 index 000000000000..22253e13b4a4 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_pack_expansion_in_call_with_class_pack/test.desc @@ -0,0 +1,16 @@ +KNOWNBUG +main.cpp +--cpp20 +^\[main\.assertion\.1\] line \d+ base-held bound args expansion: SUCCESS$ +^VERIFICATION SUCCESSFUL$ +^EXIT=0$ +^SIGNAL=0$ +-- +dropped the body +-- +Fixed across rounds 56-57: [temp.variadic]/9.2 bare pack-expansion +mem-initializer arguments resolve against the materialised parameters, +and [dcl.init.general]/16.6.2.2 parenthesized aggregate initialization +now covers a MEMBER of aggregate class type (previously only functional +casts after CTAD and aggregate bases). Runtime-verified with g++ and +clang++. diff --git a/regression/cbmc-cpp/cpp20_pack_expansion_of_nontype_pack_of_qualified_type/main.cpp b/regression/cbmc-cpp/cpp20_pack_expansion_of_nontype_pack_of_qualified_type/main.cpp new file mode 100644 index 000000000000..2e6c53facb0c --- /dev/null +++ b/regression/cbmc-cpp/cpp20_pack_expansion_of_nontype_pack_of_qualified_type/main.cpp @@ -0,0 +1,34 @@ +extern "C" void __CPROVER_assert(bool, const char *); +namespace N +{ +typedef unsigned long size_type; +} +template +struct indices +{ +}; +// N5008 [temp.param]/1, [temp.variadic]/6.8: `I...' in `indices' is a +// pack expansion of the non-type parameter pack I (the shape of user code +// with `std::size_t... I' and an index_sequence) +template +constexpr int count(indices) +{ + return sizeof...(I); +} +struct holder +{ + template + int call(indices) const + { + return sizeof...(I); + } +}; +int main() +{ + holder h; + __CPROVER_assert( + count(indices<1, 2>{}) == 2 && h.call(indices<0, 1, 2>{}) == 3, + "deduced from indices"); + __CPROVER_assert(count(indices<1, 2>{}) == 1, "WRONG (must FAIL)"); + return 0; +} diff --git a/regression/cbmc-cpp/cpp20_pack_expansion_of_nontype_pack_of_qualified_type/test.desc b/regression/cbmc-cpp/cpp20_pack_expansion_of_nontype_pack_of_qualified_type/test.desc new file mode 100644 index 000000000000..d1c58c288e87 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_pack_expansion_of_nontype_pack_of_qualified_type/test.desc @@ -0,0 +1,16 @@ +KNOWNBUG +main.cpp +--cpp20 +^\[main\.assertion\.1\] line \d+ deduced from indices: SUCCESS$ +^\[main\.assertion\.2\] line \d+ WRONG \(must FAIL\): FAILURE$ +^VERIFICATION FAILED$ +^EXIT=10$ +^SIGNAL=0$ +-- +^warning: ignoring +^CONVERSION ERROR$ +-- +The concept-aware parse of a template parameter beginning with a +qualified name did not declare the parameter to the parser's scope, so +`I...' in `indices' was parsed as a type pack expansion and only +one element was deduced. diff --git a/regression/cbmc-cpp/cpp20_pair_converting_ctor/main.cpp b/regression/cbmc-cpp/cpp20_pair_converting_ctor/main.cpp new file mode 100644 index 000000000000..38df4588c577 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_pair_converting_ctor/main.cpp @@ -0,0 +1,28 @@ +// N5008 [pairs.pair]: pair's converting constructor +// pair(U1&&, U2&&) initializes first/second from the forwarded +// arguments. In C++20 libstdc++ (GCC 13) this constructor is +// constrained with a requires-clause and explicit(bool): +// constexpr explicit(...) pair(_U1&& __x, _U2&& __y) +// The requires-clause calls the static consteval member +// _S_constructible<...>() (cpp20_requires_static_call_atom, +// cpp20_requires_class_param_atom). std::map's +// _Rb_tree::_M_get_insert_unique_pos returns _Res(__y, 0), whose literal 0 +// selects this constructor (cpp20_map_basic). g++/clang++ verify at +// runtime. +extern "C" void __CPROVER_assert(bool, const char *); +#include + +struct nodet +{ + int v; +}; + +int main() +{ + nodet n{1}; + nodet *y = &n; + std::pair b(y, 0); + __CPROVER_assert(b.first == &n, "first is y"); + __CPROVER_assert(b.second == nullptr, "second is null"); + return 0; +} diff --git a/regression/cbmc-cpp/cpp20_pair_converting_ctor/test.desc b/regression/cbmc-cpp/cpp20_pair_converting_ctor/test.desc new file mode 100644 index 000000000000..d4a522109584 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_pair_converting_ctor/test.desc @@ -0,0 +1,20 @@ +KNOWNBUG +main.cpp +--cpp20 --object-bits 12 +^\[main\.assertion\.1\] line \d+ first is y: SUCCESS$ +^\[main\.assertion\.2\] line \d+ second is null: SUCCESS$ +^VERIFICATION SUCCESSFUL$ +^EXIT=0$ +^SIGNAL=0$ +-- +dropped the body +-- +libstdc++'s C++20 std::pair converting constructor pair(U1&&, U2&&), +guarded by `requires(_S_constructible<_U1, _U2>())' and explicit(bool) +(with --cpp17 the pair uses enable_if instead). The call to the static +consteval member in the requires-clause is constant-evaluated with the +class's and the member's template arguments +(cpp20_requires_static_call_atom), so the unviable candidates are removed +during overload resolution; before, the selected constructor had no body +and both members of the pair were arbitrary. std::map's +_M_get_insert_unique_pos constructs such a pair (cpp20_map_basic). diff --git a/regression/cbmc-cpp/cpp20_pair_piecewise_construct/main.cpp b/regression/cbmc-cpp/cpp20_pair_piecewise_construct/main.cpp new file mode 100644 index 000000000000..4fe8336e054e --- /dev/null +++ b/regression/cbmc-cpp/cpp20_pair_piecewise_construct/main.cpp @@ -0,0 +1,28 @@ +// N5008 [pairs.pair], [temp.variadic]/9: piecewise pair construction. +// The delegating constructor pair(piecewise_construct_t, +// tuple<_Args1...>, tuple<_Args2...>) delegates to the +// _Index_tuple-tagged constructor whose mem-initializer +// `first(std::forward<_Args1>(std::get<_Indexes1>(__tuple1))...)` +// expands TWO packs (a type pack and a non-type index pack) in +// lockstep, and `second(...)` expands two EMPTY packs +// (value-initialization). +// +// This used to fail: the instantiated mem-initializer kept the raw +// pack names and the ellipsis (only single-element struct_tag type +// packs were substituted), its conversion threw, the constructor was +// silently dropped, and the constructed pair was havocked -- the last +// layer of std::map's operator[] value loss. +// +// g++/clang++ accept and verify at runtime. +#include +#include +extern "C" void __CPROVER_assert(bool, const char *); + +int main() +{ + std::pair p( + std::piecewise_construct, std::forward_as_tuple(1), std::tuple<>()); + __CPROVER_assert(p.first == 1, "first from tuple"); + __CPROVER_assert(p.second == 0, "second value-initialized"); + return 0; +} diff --git a/regression/cbmc-cpp/cpp20_pair_piecewise_construct/test.desc b/regression/cbmc-cpp/cpp20_pair_piecewise_construct/test.desc new file mode 100644 index 000000000000..38183ae3f986 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_pair_piecewise_construct/test.desc @@ -0,0 +1,14 @@ +KNOWNBUG +main.cpp +--cpp20 +^\[main\.assertion\.1\] line \d+ first from tuple: SUCCESS$ +^\[main\.assertion\.2\] line \d+ second value-initialized: SUCCESS$ +^VERIFICATION SUCCESSFUL$ +^EXIT=0$ +^SIGNAL=0$ +-- +dropped the body +-- +Fixed 2026-07-20: expand_member_initializer_packs_in_body (deferred +prepare + eager constexpr-member conversion paths) expands type and +non-type packs in lockstep per [temp.variadic]/9. diff --git a/regression/cbmc-cpp/cpp20_paren_aggregate_init_skips_padding/main.cpp b/regression/cbmc-cpp/cpp20_paren_aggregate_init_skips_padding/main.cpp new file mode 100644 index 000000000000..c760d7163d99 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_paren_aggregate_init_skips_padding/main.cpp @@ -0,0 +1,26 @@ +// N5008 [dcl.init.general]/16.6.2.2 (C++20), [dcl.init.aggr]/2: `A a(1, 2.0)' +// initializes the elements x and y of the aggregate A in order. Layout +// padding is not an element; the front end counted the padding after x and +// assigned 2.0 to it, leaving y zero. +extern "C" void __CPROVER_assert(bool, const char *); +struct A +{ + int x; + double y; +}; +struct I +{ + int x; + int y; +}; +int main() +{ + A a(1, 2.0); + I i(3, 4); + A b(5); + __CPROVER_assert(a.x == 1 && a.y == 2.0, "padding skipped"); + __CPROVER_assert(i.x == 3 && i.y == 4, "no padding"); + __CPROVER_assert(b.x == 5 && b.y == 0, "missing element value-initialized"); + __CPROVER_assert(false, "WRONG (must FAIL)"); + return 0; +} diff --git a/regression/cbmc-cpp/cpp20_paren_aggregate_init_skips_padding/test.desc b/regression/cbmc-cpp/cpp20_paren_aggregate_init_skips_padding/test.desc new file mode 100644 index 000000000000..63e869944beb --- /dev/null +++ b/regression/cbmc-cpp/cpp20_paren_aggregate_init_skips_padding/test.desc @@ -0,0 +1,16 @@ +KNOWNBUG +main.cpp +--cpp20 +^\[main\.assertion\.1\] .* padding skipped: SUCCESS$ +^\[main\.assertion\.2\] .* no padding: SUCCESS$ +^\[main\.assertion\.3\] .* missing element value-initialized: SUCCESS$ +^\[main\.assertion\.4\] .* WRONG \(must FAIL\): FAILURE$ +^VERIFICATION FAILED$ +^EXIT=10$ +^SIGNAL=0$ +-- +^warning: ignoring +^CONVERSION ERROR$ +-- +g++ 13 (-fsanitize=address,undefined) and clang++ 18 accept this program, +and it fails only its WRONG assertion. diff --git a/regression/cbmc-cpp/cpp20_paren_aggregate_trailing_init/main.cpp b/regression/cbmc-cpp/cpp20_paren_aggregate_trailing_init/main.cpp new file mode 100644 index 000000000000..ee53fddda2d0 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_paren_aggregate_trailing_init/main.cpp @@ -0,0 +1,46 @@ +// N5008 [dcl.init.aggr]/5 with [dcl.init.general]/16.6.2.2 (C++20 +// parenthesized aggregate initialization, P0960): elements of the +// aggregate without a corresponding element in the expression-list are +// initialized from their default member initializer or +// copy-initialized from an empty initializer list -- NOT left +// indeterminate. +// +// This used to fail: both parenthesized-aggregate lowering paths in +// cpp_constructor assigned only the given operands, so `aggt x(1, 2)` +// with a third member read garbage from `x.c`. +// +// g++/clang++ accept and verify at runtime. +extern "C" void __CPROVER_assert(bool, const char *); + +struct aggt +{ + int a; + int b; + int c; +}; + +struct baset +{ + int v; + template + baset(U u) : v(u) + { + } +}; + +struct derivedt : baset +{ + int w; +}; + +int main() +{ + aggt x(1, 2); + __CPROVER_assert(x.a == 1 && x.b == 2, "given elements"); + __CPROVER_assert(x.c == 0, "trailing element value-initialized"); + + derivedt d(7); // base from 7, w value-initialized + __CPROVER_assert(d.v == 7, "base element"); + __CPROVER_assert(d.w == 0, "trailing member after base"); + return 0; +} diff --git a/regression/cbmc-cpp/cpp20_paren_aggregate_trailing_init/test.desc b/regression/cbmc-cpp/cpp20_paren_aggregate_trailing_init/test.desc new file mode 100644 index 000000000000..a702c34d03a3 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_paren_aggregate_trailing_init/test.desc @@ -0,0 +1,16 @@ +KNOWNBUG +main.cpp +--cpp20 +^\[main\.assertion\.1\] line \d+ given elements: SUCCESS$ +^\[main\.assertion\.2\] line \d+ trailing element value-initialized: SUCCESS$ +^\[main\.assertion\.3\] line \d+ base element: SUCCESS$ +^\[main\.assertion\.4\] line \d+ trailing member after base: SUCCESS$ +^VERIFICATION SUCCESSFUL$ +^EXIT=0$ +^SIGNAL=0$ +-- +dropped the body +-- +Fixed 2026-07-19: both parenthesized-aggregate lowering paths in +cpp_constructor value-initialize trailing elements per +[dcl.init.aggr]/5. diff --git a/regression/cbmc-cpp/cpp20_parenthesized_aggregate_element_copy_initialized/main.cpp b/regression/cbmc-cpp/cpp20_parenthesized_aggregate_element_copy_initialized/main.cpp new file mode 100644 index 000000000000..400d72747824 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_parenthesized_aggregate_element_copy_initialized/main.cpp @@ -0,0 +1,25 @@ +extern "C" void __CPROVER_assert(bool, const char *); +struct to_int +{ + explicit operator int() const + { + return 1; + } +}; +struct aggregate +{ + int v; +}; +// N5008 [dcl.init.general]/16.6.2.2, [dcl.init.aggr]/4.3, +// [over.match.conv]/1.1: in the parenthesized aggregate initialization +// `aggregate a(e)' the element v is copy-initialized from e, which does not +// use the explicit conversion function +int main() +{ + __CPROVER_assert( + !__is_constructible(aggregate, to_int) && + __is_constructible(aggregate, int) && __is_constructible(int, to_int), + "element copy-initialized"); + __CPROVER_assert(__is_constructible(aggregate, to_int), "WRONG (must FAIL)"); + return 0; +} diff --git a/regression/cbmc-cpp/cpp20_parenthesized_aggregate_element_copy_initialized/test.desc b/regression/cbmc-cpp/cpp20_parenthesized_aggregate_element_copy_initialized/test.desc new file mode 100644 index 000000000000..f6bc31062915 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_parenthesized_aggregate_element_copy_initialized/test.desc @@ -0,0 +1,15 @@ +KNOWNBUG +main.cpp +--cpp20 +^\[main\.assertion\.1\] line \d+ element copy-initialized: SUCCESS$ +^\[main\.assertion\.2\] line \d+ WRONG \(must FAIL\): FAILURE$ +^VERIFICATION FAILED$ +^EXIT=10$ +^SIGNAL=0$ +-- +^warning: ignoring +^CONVERSION ERROR$ +-- +A scalar element of a parenthesized aggregate initialization was +initialized with an explicit cast of its initializer, which applied the +explicit conversion function of a class operand. diff --git a/regression/cbmc-cpp/cpp20_parenthesized_aggregate_init_one_element/main.cpp b/regression/cbmc-cpp/cpp20_parenthesized_aggregate_init_one_element/main.cpp new file mode 100644 index 000000000000..9e2c44328874 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_parenthesized_aggregate_init_one_element/main.cpp @@ -0,0 +1,30 @@ +// N5008 [dcl.init.general]/16.6.2.2 (P0960): `T x(e)' with T an aggregate +// and no viable constructor initializes the first element from e and +// value-initializes the others +extern "C" void __CPROVER_assert(bool, const char *); +struct point +{ + int x; + int y; +}; +template +struct leaf +{ + H value; +}; +struct wrap +{ + point p; +}; +int main() +{ + point a(4); + __CPROVER_assert(a.x == 4 && a.y == 0, "first element"); + leaf<0, long> b(5); + __CPROVER_assert(b.value == 5, "class template specialization"); + point c(a); + __CPROVER_assert(c.x == 4, "copy constructor still preferred"); + wrap w(a); + __CPROVER_assert(w.p.x == 4, "element of class type"); + __CPROVER_assert(a.x == 5, "WRONG (must FAIL)"); +} diff --git a/regression/cbmc-cpp/cpp20_parenthesized_aggregate_init_one_element/test.desc b/regression/cbmc-cpp/cpp20_parenthesized_aggregate_init_one_element/test.desc new file mode 100644 index 000000000000..5f639469004d --- /dev/null +++ b/regression/cbmc-cpp/cpp20_parenthesized_aggregate_init_one_element/test.desc @@ -0,0 +1,23 @@ +KNOWNBUG +main.cpp +--cpp20 +^\[main\.assertion\.1\] line \d+ first element: SUCCESS$ +^\[main\.assertion\.2\] line \d+ class template specialization: SUCCESS$ +^\[main\.assertion\.3\] line \d+ copy constructor still preferred: SUCCESS$ +^\[main\.assertion\.4\] line \d+ element of class type: SUCCESS$ +^\[main\.assertion\.5\] line \d+ WRONG \(must FAIL\): FAILURE$ +^VERIFICATION FAILED$ +^EXIT=10$ +^SIGNAL=0$ +-- +^warning: ignoring +^CONVERSION ERROR$ +-- +N5008 [dcl.init.general]/16.6.2.2 (C++20, P0960): `point a(4)' initializes +the aggregate's first element from 4. With several expressions, or for +an aggregate that is not a POD, this worked; a POD aggregate with one +expression that does not convert to it was assigned from it ("invalid +implicit conversion from 'signed int' to 'struct point'", bin53). Before +C++20 the program is ill-formed, which the front end still reports. +g++ 13 and clang++ 18 accept this program, and it fails only its WRONG +assertion. diff --git a/regression/cbmc-cpp/cpp20_parenthesized_aggregate_init_one_element/test_cpp17.desc b/regression/cbmc-cpp/cpp20_parenthesized_aggregate_init_one_element/test_cpp17.desc new file mode 100644 index 000000000000..33b52eccea14 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_parenthesized_aggregate_init_one_element/test_cpp17.desc @@ -0,0 +1,12 @@ +KNOWNBUG +main.cpp +--cpp17 +^EXIT=(1|6)$ +^SIGNAL=0$ +^CONVERSION ERROR$ +-- +^warning: ignoring +-- +N5008 [dcl.init.general]/16.6.2.2 is a C++20 rule; in C++17 `point a(4)' +needs a constructor (g++ 13 -std=c++17 rejects the program). +This rejects-invalid companion of test.desc also passes on bin53. diff --git a/regression/cbmc-cpp/cpp20_parenthesized_aggregate_initialization_of_union/main.cpp b/regression/cbmc-cpp/cpp20_parenthesized_aggregate_initialization_of_union/main.cpp new file mode 100644 index 000000000000..8e36ca81719a --- /dev/null +++ b/regression/cbmc-cpp/cpp20_parenthesized_aggregate_initialization_of_union/main.cpp @@ -0,0 +1,55 @@ +// N5008 [dcl.init.general]/16.6.2.2 (C++20), [dcl.init.aggr]/2: a union +// is an aggregate whose elements are its non-static data members; +// `Rep(e)' with no viable constructor copy-initializes the first member +// from e. libc++'s basic_string (Xcode 26) initializes its union member +// `__rep_(__short())' in every constructor. +extern "C" void __CPROVER_assert(bool, const char *); +struct Short +{ + unsigned char size; + char data[7]; +}; +struct Long +{ + unsigned long cap; +}; +union Rep +{ + Short s; + Long l; +}; +struct Str +{ + Rep rep; + Str() : rep(Short()) + { + } + explicit Str(int) : rep(Short{3, {'a'}}) + { + } +}; +struct Pair +{ + int a; + int b; +}; +struct Holder +{ + Pair p; + Holder() : p(1, 2) + { + } +}; +int main() +{ + Str s; + __CPROVER_assert(s.rep.s.size == 0, "union from first member's type"); + Str t(1); + __CPROVER_assert(t.rep.s.size == 3 && t.rep.s.data[0] == 'a', "with value"); + Rep r(Short{4, {}}); + __CPROVER_assert(r.s.size == 4, "local union"); + Holder h; + __CPROVER_assert(h.p.a == 1 && h.p.b == 2, "struct member"); + __CPROVER_assert(false, "WRONG (must FAIL)"); + return 0; +} diff --git a/regression/cbmc-cpp/cpp20_parenthesized_aggregate_initialization_of_union/test.desc b/regression/cbmc-cpp/cpp20_parenthesized_aggregate_initialization_of_union/test.desc new file mode 100644 index 000000000000..56c0a786b561 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_parenthesized_aggregate_initialization_of_union/test.desc @@ -0,0 +1,18 @@ +KNOWNBUG +main.cpp +--cpp20 +^\[main\.assertion\.1\] line \d+ union from first member's type: SUCCESS$ +^\[main\.assertion\.2\] line \d+ with value: SUCCESS$ +^\[main\.assertion\.3\] line \d+ local union: SUCCESS$ +^\[main\.assertion\.4\] line \d+ struct member: SUCCESS$ +^\[main\.assertion\.5\] line \d+ WRONG \(must FAIL\): FAILURE$ +^\*\* 1 of \d+ failed +^VERIFICATION FAILED$ +^EXIT=10$ +^SIGNAL=0$ +-- +^warning: ignoring +-- +Parenthesized aggregate initialization was implemented for structs only; +for a union the expression was converted to the union type ("invalid +implicit conversion from 'struct Short' to 'union Rep'"). diff --git a/regression/cbmc-cpp/cpp20_partial_ordering_more_constrained_tie/main.cpp b/regression/cbmc-cpp/cpp20_partial_ordering_more_constrained_tie/main.cpp new file mode 100644 index 000000000000..ff31f220a9b2 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_partial_ordering_more_constrained_tie/main.cpp @@ -0,0 +1,31 @@ +extern "C" void __CPROVER_assert(bool, const char *); +template +concept has_begin = requires(T &t) { t.begin(); }; +struct fn +{ + template + requires has_begin + int operator()(T &&t) const + { + return t.begin(); + } + // N5008 [temp.func.order]/8.4: both templates are equally specialized; + // the constrained one is more specialized and the deleted one loses + template + void operator()(U &&) const = delete; +}; +struct R +{ + int begin() + { + return 7; + } +}; +int main() +{ + R r; + int b = fn{}(r); + __CPROVER_assert(b == 7, "constrained overload"); + __CPROVER_assert(b == 0, "WRONG (must FAIL)"); + return 0; +} diff --git a/regression/cbmc-cpp/cpp20_partial_ordering_more_constrained_tie/test.desc b/regression/cbmc-cpp/cpp20_partial_ordering_more_constrained_tie/test.desc new file mode 100644 index 000000000000..a6e727a43163 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_partial_ordering_more_constrained_tie/test.desc @@ -0,0 +1,16 @@ +KNOWNBUG +main.cpp +--cpp20 +^\[main\.assertion\.1\] line \d+ constrained overload: SUCCESS$ +^\[main\.assertion\.2\] line \d+ WRONG \(must FAIL\): FAILURE$ +^VERIFICATION FAILED$ +^EXIT=10$ +^SIGNAL=0$ +-- +^warning: ignoring +^CONVERSION ERROR$ +-- +Two function templates that partial ordering leaves equally specialized +(T && and U &&) were ambiguous although only one is constrained. libc++'s +customization point objects pair a constrained operator() with a deleted +unconstrained fallback. diff --git a/regression/cbmc-cpp/cpp20_partial_ordering_pointer/main.cpp b/regression/cbmc-cpp/cpp20_partial_ordering_pointer/main.cpp new file mode 100644 index 000000000000..5c481195f069 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_partial_ordering_pointer/main.cpp @@ -0,0 +1,39 @@ +// N5008 [temp.func.order] / [temp.deduct.partial]: when two viable function +// template specializations have indistinguishable conversion sequences for the +// call arguments, the more specialized template is chosen. +// +// Here both overloads are viable for an lvalue `int*` argument and their +// implicit conversion sequences are indistinguishable (identity for f(T*); +// lvalue-to-const-reference binding for f(const U&) -- both rank as an exact +// match for an lvalue argument). Overload resolution must therefore fall back +// to partial ordering, under which f(T*) is more specialized than f(const U&): +// deducing U from a synthesized X* succeeds (U = X*), but deducing T* from a +// synthesized (const) Y fails (Y is not a pointer). So f(T*) is selected and +// `r == 1`. +// +// This is the header-free analogue of libstdc++ std::to_address, whose call to +// __to_address(_Tp*) // raw, more specialized +// __to_address(const _Ptr&) // fancy-pointer fallback +// with the lvalue pointer parameter ties and, without partial ordering, reports +// "does not uniquely resolve" -- breaking std::span's _M_ptr (see cpp20_span). +// +// The assertion is non-vacuous: if the wrong overload were chosen, r == 2. +template +int f(T *) +{ + return 1; +} +template +int f(const U &) +{ + return 2; +} + +int main() +{ + int x = 0; + int *p = &x; // lvalue pointer argument + int r = f(p); + __CPROVER_assert(r == 1, "f(T*) is more specialized than f(const U&)"); + return 0; +} diff --git a/regression/cbmc-cpp/cpp20_partial_ordering_pointer/test.desc b/regression/cbmc-cpp/cpp20_partial_ordering_pointer/test.desc new file mode 100644 index 000000000000..d7a8983e822a --- /dev/null +++ b/regression/cbmc-cpp/cpp20_partial_ordering_pointer/test.desc @@ -0,0 +1,23 @@ +KNOWNBUG +main.cpp +--cpp20 +^\[main\.assertion\.1\] line \d+ f\(T\*\) is more specialized than f\(const U&\): SUCCESS$ +^VERIFICATION SUCCESSFUL$ +^EXIT=0$ +^SIGNAL=0$ +-- +^.*does not uniquely resolve.*$ +^CONVERSION ERROR$ +dropped the body +-- +N5008 [temp.func.order] partial ordering as a tie-breaker in overload +resolution. For an lvalue `int*` argument, f(T*) and f(const U&) have +indistinguishable conversion sequences (both exact-match), so the call is +resolved by partial ordering, under which f(T*) is more specialized (deducing U +from a synthesized X* succeeds; deducing T* from a synthesized Y fails). + +disambiguate_functions now runs deduction-based partial ordering +([temp.deduct.partial]) across function-template candidates that tie on +conversion distance, via function_template_at_least_as_specialised. This is the +header-free analogue of the std::to_address(_Tp*) vs __to_address(const _Ptr&) +ambiguity that previously blocked std::span's element access (cpp20_span). diff --git a/regression/cbmc-cpp/cpp20_partial_spec_conditional_sfinae/main.cpp b/regression/cbmc-cpp/cpp20_partial_spec_conditional_sfinae/main.cpp new file mode 100644 index 000000000000..87a90eee4ae6 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_partial_spec_conditional_sfinae/main.cpp @@ -0,0 +1,42 @@ +// CORE (N5008 [temp.spec.partial.match]/2, [temp.deduct.general]/8, +// [expr.cond]/4). +// +// The same conditional-operator SFINAE partial-spec selection as +// cpp20_partial_spec_conditional_sfinae_member, but exercised with +// function-body locals rather than as members of a class template. Here CBMC +// is correct: the specialization is selected when a common type exists +// (`cr`) and rejected (falling back to the primary) when the +// conditional `decltype` is ill-formed (`cr`). +// +// This is the working contrast to the KNOWNBUG member case, isolating the +// divergence to the class-member-instantiation context. (CBMC currently also +// leaks a "types are incompatible" diagnostic for the rejected case -- a +// contained substitution failure should be silent per [temp.deduct.general]/8 +// -- but the verification result itself is correct.) + +template +X declval(); + +template +using void_t = void; + +template +struct cr +{ + int tag = 1; // primary +}; + +template +struct cr() : declval())>> +{ + int tag = 2; // selected iff A and B have a common type +}; + +int main() +{ + cr ok; // common type exists -> specialization (tag 2) + cr bad; // no common type -> primary (tag 1) + __CPROVER_assert(ok.tag == 2, "common type -> specialization"); + __CPROVER_assert(bad.tag == 1, "no common type -> primary"); + return 0; +} diff --git a/regression/cbmc-cpp/cpp20_partial_spec_conditional_sfinae/test.desc b/regression/cbmc-cpp/cpp20_partial_spec_conditional_sfinae/test.desc new file mode 100644 index 000000000000..4b8dd1dac29f --- /dev/null +++ b/regression/cbmc-cpp/cpp20_partial_spec_conditional_sfinae/test.desc @@ -0,0 +1,17 @@ +KNOWNBUG +main.cpp +--cpp20 +^VERIFICATION SUCCESSFUL$ +^EXIT=0$ +^SIGNAL=0$ +-- +^CONVERSION ERROR$ +^.*types are incompatible.*$ +dropped the body +-- +Conditional-operator SFINAE partial-spec selection +(`void_t() : declval())>`) with function-body +locals -- the working contrast to cpp20_partial_spec_conditional_sfinae_member. +N5008 [temp.spec.partial.match]/2, [temp.deduct.general]/8, [expr.cond]/4. The +specialization is selected when a common type exists and rejected (primary used) +when the conditional decltype is ill-formed. diff --git a/regression/cbmc-cpp/cpp20_partial_spec_conditional_sfinae_member/main.cpp b/regression/cbmc-cpp/cpp20_partial_spec_conditional_sfinae_member/main.cpp new file mode 100644 index 000000000000..2705bd4b5a0f --- /dev/null +++ b/regression/cbmc-cpp/cpp20_partial_spec_conditional_sfinae_member/main.cpp @@ -0,0 +1,67 @@ +// KNOWNBUG (N5008 [temp.spec.partial.match]/2, [temp.deduct.general]/8, +// [expr.cond]/4). +// +// A class-template partial specialization is selected when the SFINAE check in +// its argument list -- here `void_t() : +// declval())>` -- is well-formed, and is rejected (falling back to the +// primary template) when that conditional-expression has no common type and is +// therefore ill-formed. Substitution failure in the immediate context is not +// an error ([temp.deduct.general]/8); it just removes the specialization from +// consideration. +// +// This is the minimal, self-contained essence of libstdc++'s C++20 +// `std::__common_ref_impl<_Xp&, _Yp&, void_t<__condres_cvref<_Xp, _Yp>>>` +// family (used by `common_reference`, reached via the iterator concepts when a +// `reverse_iterator` member of `std::basic_string` / `std::vector` is +// instantiated). +// +// DIVERGENCE: when the partial specialization is selected for a **member of a +// class template** (instantiated as part of the enclosing class's body), CBMC +// fails to treat the ill-formed conditional `decltype` as a substitution +// failure, so it wrongly selects the specialization for `cref` +// (which has no common type). The very same construct used as a function-body +// local works (see cpp20_partial_spec_conditional_sfinae), so this is a +// context-dependent partial-spec/SFINAE evaluation bug, not a parsing bug. +// +// When fixed, reclassify this test to CORE. + +template +X declval(); + +template +using void_t = void; + +template +using cond_res = decltype(false ? declval() : declval()); + +template +struct cref +{ + int tag = 1; // primary +}; + +template +struct cref>> +{ + int tag = 2; // selected iff A and B have a common type +}; + +template +struct Outer +{ + cref same; // T, T -> common type exists -> specialization (tag 2) + cref diff; // int, int* -> no common type -> primary (tag 1) + int v; + Outer() : v(7) + { + } +}; + +int main() +{ + Outer o; + __CPROVER_assert(o.v == 7, "class body fully elaborated"); + __CPROVER_assert(o.same.tag == 2, "common type -> specialization"); + __CPROVER_assert(o.diff.tag == 1, "no common type -> primary"); + return 0; +} diff --git a/regression/cbmc-cpp/cpp20_partial_spec_conditional_sfinae_member/test.desc b/regression/cbmc-cpp/cpp20_partial_spec_conditional_sfinae_member/test.desc new file mode 100644 index 000000000000..f52372d84b61 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_partial_spec_conditional_sfinae_member/test.desc @@ -0,0 +1,26 @@ +KNOWNBUG +main.cpp +--cpp20 +^VERIFICATION SUCCESSFUL$ +^EXIT=0$ +^SIGNAL=0$ +-- +^CONVERSION ERROR$ +dropped the body +-- +Class-template partial specialization selected via a conditional-operator SFINAE +check (`void_t() : declval())>`) when the +specialization is a MEMBER of a class template. N5008 +[temp.spec.partial.match]/2, [temp.deduct.general]/8, [expr.cond]/4, +[class.default.ctor]/3. The minimal essence of libstdc++'s C++20 +`__common_ref_impl<_Xp&, _Yp&, void_t<__condres_cvref<_Xp,_Yp>>>` family. + +For `cref` the conditional has no common type, so the specialization +is rejected and the primary is used (`tag == 1`). Previously the primary +fallback was still incomplete at the enclosing class's constructor-synthesis +time, so its default member initializer was dropped from the constructor and the +member read uninitialised, while a cleanly-matched member (`cref`) was +already complete -- an inconsistency. Fixed by elaborating a member's +class-template-instance type before deciding whether its default construction is +non-trivial ([class.default.ctor]/3 + [temp.inst]/2). +See doc/architectural/cpp-class-template-instantiation-plan.md. diff --git a/regression/cbmc-cpp/cpp20_partial_specialization_requires_clause_substitution_failure/main.cpp b/regression/cbmc-cpp/cpp20_partial_specialization_requires_clause_substitution_failure/main.cpp new file mode 100644 index 000000000000..8638e93b6b41 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_partial_specialization_requires_clause_substitution_failure/main.cpp @@ -0,0 +1,46 @@ +// N5008 [temp.constr.atomic]/3, [temp.spec.partial.match]/2: a partial +// specialization whose requires-clause `T::is_special' is ill-formed after +// substitution (T = int *) is not satisfied, so it does not match. CBMC +// used to leave a clause it could not type-check open and treat it as +// satisfied. libc++ constrains its join_view specialization of +// __segmented_iterator_traits this way: with included, int * was +// taken for a segmented iterator, and std::ranges::find on an array called +// __find_segment_if (cpp20_libcxx_header_drops/test_ranges_find). +extern "C" void __CPROVER_assert(bool, const char *); +template +struct bc +{ + static constexpr bool value = B; +}; +template +struct traits; +template + requires(T::is_special) +struct traits +{ + static constexpr int kind = 1; +}; +template +struct has_spec : bc +{ +}; +template +struct has_spec : bc +{ +}; +struct special +{ + static constexpr bool is_special = true; +}; +struct plain +{ + static constexpr bool is_special = false; +}; +int main() +{ + __CPROVER_assert(has_spec>::value, "constraint satisfied"); + __CPROVER_assert(!has_spec>::value, "constraint false"); + __CPROVER_assert(!has_spec>::value, "substitution failure"); + __CPROVER_assert(false, "WRONG (must FAIL)"); + return 0; +} diff --git a/regression/cbmc-cpp/cpp20_partial_specialization_requires_clause_substitution_failure/test.desc b/regression/cbmc-cpp/cpp20_partial_specialization_requires_clause_substitution_failure/test.desc new file mode 100644 index 000000000000..7bfa6ec48273 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_partial_specialization_requires_clause_substitution_failure/test.desc @@ -0,0 +1,16 @@ +KNOWNBUG +main.cpp +--cpp20 +^\[main\.assertion\.1\] .* constraint satisfied: SUCCESS$ +^\[main\.assertion\.2\] .* constraint false: SUCCESS$ +^\[main\.assertion\.3\] .* substitution failure: SUCCESS$ +^\[main\.assertion\.4\] .* WRONG \(must FAIL\): FAILURE$ +^VERIFICATION FAILED$ +^EXIT=10$ +^SIGNAL=0$ +-- +^warning: ignoring +-- +N5008 [temp.constr.atomic]/3: a requires-clause of a partial specialization +whose substitution fails is not satisfied, and the specialization does not +match. diff --git a/regression/cbmc-cpp/cpp20_partial_specialization_type_constraint/main.cpp b/regression/cbmc-cpp/cpp20_partial_specialization_type_constraint/main.cpp new file mode 100644 index 000000000000..ab66bfcb2095 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_partial_specialization_type_constraint/main.cpp @@ -0,0 +1,80 @@ +// N5008 [temp.spec.partial.match]/2: a partial specialization matches only +// if the deduced arguments satisfy its associated constraints, including +// the type-constraints of its template parameters ([temp.param]/9: +// `C T' introduces `C') +#include +extern "C" void __CPROVER_assert(bool, const char *); + +// a concept defined through a variable template +template +constexpr bool is_small = sizeof(T) <= 2; +template +concept small = is_small; + +// libstdc++ 's formatter: integral and floating-point partial +// specializations, each with a member template of the same name +template +struct fmt; +template +struct fmt +{ + int id() const + { + return 1; + } + template + int format(T, O) const + { + return 10; + } +}; +template +struct fmt +{ + int id() const + { + return 2; + } + template + int format(T, O) const + { + return 20; + } +}; + +template +struct size_class +{ + static constexpr int value = 0; +}; +template +struct size_class +{ + static constexpr int value = 1; +}; + +// variable templates ([temp.spec.partial.general]/1) +template +constexpr int kind = 0; +template +constexpr int kind = 1; +template +constexpr int req = 0; +template + requires small +constexpr int req = 2; + +int main() +{ + fmt fd; + fmt fi; + __CPROVER_assert(fd.id() == 2, "floating-point specialization"); + __CPROVER_assert(fd.format(1.5, 0) == 20, "its member template"); + __CPROVER_assert(fi.id() == 1, "integral specialization"); + __CPROVER_assert(fi.format(3, 0) == 10, "its member template too"); + __CPROVER_assert(size_class::value == 1, "satisfied"); + __CPROVER_assert(size_class::value == 0, "unsatisfied: primary"); + __CPROVER_assert(kind == 1 && kind == 0, "variable template"); + __CPROVER_assert(req == 2 && req == 0, "requires-clause"); + __CPROVER_assert(fd.id() == 1, "WRONG (must FAIL)"); +} diff --git a/regression/cbmc-cpp/cpp20_partial_specialization_type_constraint/test.desc b/regression/cbmc-cpp/cpp20_partial_specialization_type_constraint/test.desc new file mode 100644 index 000000000000..537154efe6e0 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_partial_specialization_type_constraint/test.desc @@ -0,0 +1,32 @@ +KNOWNBUG +main.cpp +--cpp20 +^\[main\.assertion\.1\] line \d+ floating-point specialization: SUCCESS$ +^\[main\.assertion\.2\] line \d+ its member template: SUCCESS$ +^\[main\.assertion\.3\] line \d+ integral specialization: SUCCESS$ +^\[main\.assertion\.4\] line \d+ its member template too: SUCCESS$ +^\[main\.assertion\.5\] line \d+ satisfied: SUCCESS$ +^\[main\.assertion\.6\] line \d+ unsatisfied: primary: SUCCESS$ +^\[main\.assertion\.7\] line \d+ variable template: SUCCESS$ +^\[main\.assertion\.8\] line \d+ requires-clause: SUCCESS$ +^\[main\.assertion\.9\] line \d+ WRONG \(must FAIL\): FAILURE$ +^VERIFICATION FAILED$ +^EXIT=10$ +^SIGNAL=0$ +-- +^warning: ignoring +^CONVERSION ERROR$ +-- +N5008 [temp.spec.partial.match]/2, [temp.param]/9: a partial +specialization `template struct S' matches only if C is +satisfied by the deduced T. The class-template search evaluated the +concept's body structurally and failed when it named a variable or class +template (`is_integral_v', so fmt got std::integral's +specialization), and the variable-template search checked neither the +type-constraints nor the requires-clause. Both now evaluate the +type-constraint's concept-id (#C_type_constraint) and the requires-clause +with evaluate_constraint. Found from libstdc++ : formatter was the floating-point specialization, so __formatter_fp::format +(format:1422) was instantiated for int +(cpp11_libstdcxx_header_drops/test_format.desc). g++ 13 and clang++ 18 +accept this program, and it fails only its WRONG assertion. diff --git a/regression/cbmc-cpp/cpp20_perfect_forward_empty_pack_decltype/main.cpp b/regression/cbmc-cpp/cpp20_perfect_forward_empty_pack_decltype/main.cpp new file mode 100644 index 000000000000..7aecf2349101 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_perfect_forward_empty_pack_decltype/main.cpp @@ -0,0 +1,44 @@ +// N5008 [temp.variadic]/16 + [temp.arg.explicit]/4: a member template +// `operator()(Args... args) -> decltype(Op()(Idx..., args...))` whose own +// pack deduces EMPTY under an outer deduction (`invoke_`'s +// decltype(F()())): the empty pack's dead reference must vanish from the +// trailing return type in every candidate-signature and instantiation +// copy, and the mixed-level expansion must not size `args...` by the +// unrelated non-empty class-level pack Idx. Distilled from libc++ +// __perfect_forward under std::invoke (ranges views::take pipe). +extern "C" void __CPROVER_assert(bool, const char *); +template +struct integer_sequence; +template +using index_sequence = integer_sequence; +struct op +{ + int operator()(long, long) + { + return 7; + } +}; +template +struct pf; +template +struct pf> +{ + template + auto operator()(Args... args) -> decltype(Op()(Idx..., args...)) + { + return Op()(Idx..., args...); + } +}; +struct bb : pf> +{ +} c; +template +decltype(F()()) invoke_(F f) +{ + return f(); +} +int main() +{ + __CPROVER_assert(invoke_(c) == 7, "mixed pack under outer deduction"); + return 0; +} diff --git a/regression/cbmc-cpp/cpp20_perfect_forward_empty_pack_decltype/test.desc b/regression/cbmc-cpp/cpp20_perfect_forward_empty_pack_decltype/test.desc new file mode 100644 index 000000000000..b7115f074584 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_perfect_forward_empty_pack_decltype/test.desc @@ -0,0 +1,14 @@ +KNOWNBUG libcxx +main.cpp +--cpp20 --stdlib libc++ +^\[main\.assertion\.1\] line \d+ mixed pack under outer deduction: SUCCESS$ +^VERIFICATION SUCCESSFUL$ +^EXIT=0$ +^SIGNAL=0$ +-- +dropped the body +-- +Pre-fix: main silently dropped (no diagnostic), then symex invariant +violation on the malformed global initializer. +Runtime-verified with clang++ (g++ rejects the alias-template +pack deduction shape). diff --git a/regression/cbmc-cpp/cpp20_probe_char8_t/main.cpp b/regression/cbmc-cpp/cpp20_probe_char8_t/main.cpp new file mode 100644 index 000000000000..4e06e3048311 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_probe_char8_t/main.cpp @@ -0,0 +1,9 @@ +// N5008 [lex.ccon], [basic.fundamental]: char8_t string and character +// literals. +extern "C" void __CPROVER_assert(bool, const char *); +int main() +{ + const char8_t *s = u8"x"; + __CPROVER_assert(s[0] == u8'x', "char8_t"); + __CPROVER_assert(false, "WRONG (must FAIL)"); +} diff --git a/regression/cbmc-cpp/cpp20_probe_char8_t/test.desc b/regression/cbmc-cpp/cpp20_probe_char8_t/test.desc new file mode 100644 index 000000000000..2774fa3789a0 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_probe_char8_t/test.desc @@ -0,0 +1,16 @@ +KNOWNBUG +main.cpp +--cpp20 +^\[main\.assertion\.1\] line \d+ char8_t: SUCCESS$ +^\[main\.assertion\.2\] line \d+ WRONG \(must FAIL\): FAILURE$ +^\*\* 1 of \d+ failed +^VERIFICATION FAILED$ +^EXIT=10$ +^SIGNAL=0$ +-- +^warning: ignoring +^CONVERSION ERROR$ +-- +A probe of the C++20 support census (2026-11-05): char8_t string and character +literals. The last assertion is WRONG and must fail, so a pass is not +vacuous. diff --git a/regression/cbmc-cpp/cpp20_probe_concept/main.cpp b/regression/cbmc-cpp/cpp20_probe_concept/main.cpp new file mode 100644 index 000000000000..d1344672f2ec --- /dev/null +++ b/regression/cbmc-cpp/cpp20_probe_concept/main.cpp @@ -0,0 +1,18 @@ +// N5008 [temp.constr]: overload resolution with a constrained template. +extern "C" void __CPROVER_assert(bool, const char *); +template +concept Small = sizeof(T) <= 2; +template +int f(T) +{ + return 1; +} +int f(...) +{ + return 2; +} +int main() +{ + __CPROVER_assert(f('c') == 1 && f(1.0) == 2, "constrained overload"); + __CPROVER_assert(false, "WRONG (must FAIL)"); +} diff --git a/regression/cbmc-cpp/cpp20_probe_concept/test.desc b/regression/cbmc-cpp/cpp20_probe_concept/test.desc new file mode 100644 index 000000000000..6649ea254c25 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_probe_concept/test.desc @@ -0,0 +1,16 @@ +KNOWNBUG +main.cpp +--cpp20 +^\[main\.assertion\.1\] line \d+ constrained overload: SUCCESS$ +^\[main\.assertion\.2\] line \d+ WRONG \(must FAIL\): FAILURE$ +^\*\* 1 of \d+ failed +^VERIFICATION FAILED$ +^EXIT=10$ +^SIGNAL=0$ +-- +^warning: ignoring +^CONVERSION ERROR$ +-- +A probe of the C++20 support census (2026-11-05): overload resolution with a +constrained template. The last assertion is WRONG and must fail, so a pass is +not vacuous. diff --git a/regression/cbmc-cpp/cpp20_probe_consteval/main.cpp b/regression/cbmc-cpp/cpp20_probe_consteval/main.cpp new file mode 100644 index 000000000000..57769725064f --- /dev/null +++ b/regression/cbmc-cpp/cpp20_probe_consteval/main.cpp @@ -0,0 +1,11 @@ +// N5008 [dcl.constexpr]: a call of an immediate function. +extern "C" void __CPROVER_assert(bool, const char *); +consteval int sq(int x) +{ + return x * x; +} +int main() +{ + __CPROVER_assert(sq(3) == 9, "consteval call"); + __CPROVER_assert(false, "WRONG (must FAIL)"); +} diff --git a/regression/cbmc-cpp/cpp20_probe_consteval/test.desc b/regression/cbmc-cpp/cpp20_probe_consteval/test.desc new file mode 100644 index 000000000000..281bb0e1cb98 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_probe_consteval/test.desc @@ -0,0 +1,16 @@ +KNOWNBUG +main.cpp +--cpp20 +^\[main\.assertion\.1\] line \d+ consteval call: SUCCESS$ +^\[main\.assertion\.2\] line \d+ WRONG \(must FAIL\): FAILURE$ +^\*\* 1 of \d+ failed +^VERIFICATION FAILED$ +^EXIT=10$ +^SIGNAL=0$ +-- +^warning: ignoring +^CONVERSION ERROR$ +-- +A probe of the C++20 support census (2026-11-05): a call of an immediate +function. The last assertion is WRONG and must fail, so a pass is not +vacuous. diff --git a/regression/cbmc-cpp/cpp20_probe_constinit/main.cpp b/regression/cbmc-cpp/cpp20_probe_constinit/main.cpp new file mode 100644 index 000000000000..9c143c6a801b --- /dev/null +++ b/regression/cbmc-cpp/cpp20_probe_constinit/main.cpp @@ -0,0 +1,8 @@ +// N5008 [dcl.constinit]: a constinit variable. +extern "C" void __CPROVER_assert(bool, const char *); +constinit int g = 5; +int main() +{ + __CPROVER_assert(g == 5, "constinit"); + __CPROVER_assert(false, "WRONG (must FAIL)"); +} diff --git a/regression/cbmc-cpp/cpp20_probe_constinit/test.desc b/regression/cbmc-cpp/cpp20_probe_constinit/test.desc new file mode 100644 index 000000000000..44932c51b97c --- /dev/null +++ b/regression/cbmc-cpp/cpp20_probe_constinit/test.desc @@ -0,0 +1,15 @@ +KNOWNBUG +main.cpp +--cpp20 +^\[main\.assertion\.1\] line \d+ constinit: SUCCESS$ +^\[main\.assertion\.2\] line \d+ WRONG \(must FAIL\): FAILURE$ +^\*\* 1 of \d+ failed +^VERIFICATION FAILED$ +^EXIT=10$ +^SIGNAL=0$ +-- +^warning: ignoring +^CONVERSION ERROR$ +-- +A probe of the C++20 support census (2026-11-05): a constinit variable. The +last assertion is WRONG and must fail, so a pass is not vacuous. diff --git a/regression/cbmc-cpp/cpp20_probe_coroutine/main.cpp b/regression/cbmc-cpp/cpp20_probe_coroutine/main.cpp new file mode 100644 index 000000000000..e912e9dbd503 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_probe_coroutine/main.cpp @@ -0,0 +1,47 @@ +// N5008 [dcl.fct.def.coroutine], [expr.yield]: the yielded value. +#include +extern "C" void __CPROVER_assert(bool, const char *); +struct G +{ + struct promise_type + { + int v = 0; + G get_return_object() + { + return G{std::coroutine_handle::from_promise(*this)}; + } + std::suspend_always initial_suspend() + { + return {}; + } + std::suspend_always final_suspend() noexcept + { + return {}; + } + std::suspend_always yield_value(int x) + { + v = x; + return {}; + } + void return_void() + { + } + void unhandled_exception() + { + } + }; + std::coroutine_handle h; +}; +G gen() +{ + co_yield 7; +} +int main() +{ + G g = gen(); + g.h.resume(); + int v = g.h.promise().v; + g.h.destroy(); + __CPROVER_assert(v == 7, "the yielded value"); + __CPROVER_assert(false, "WRONG (must FAIL)"); +} diff --git a/regression/cbmc-cpp/cpp20_probe_coroutine/test.desc b/regression/cbmc-cpp/cpp20_probe_coroutine/test.desc new file mode 100644 index 000000000000..c1e7011a11fa --- /dev/null +++ b/regression/cbmc-cpp/cpp20_probe_coroutine/test.desc @@ -0,0 +1,20 @@ +KNOWNBUG libstdcxx +main.cpp +--cpp20 --unwind 4 +^\[main\.assertion\.1\] line \d+ the yielded value: SUCCESS$ +^\[main\.assertion\.2\] line \d+ WRONG \(must FAIL\): FAILURE$ +^\*\* 1 of \d+ failed +^VERIFICATION FAILED$ +^EXIT=10$ +^SIGNAL=0$ +-- +^warning: ignoring +^CONVERSION ERROR$ +-- +g++ and clang++ (GCC 16 for C++23 and C++26) accept this program, and it fails +only its WRONG assertion. Coroutines are parsed but not implemented; see +cpp20_coroutine_generator_semantics for what CBMC does instead and what a fix +needs. + +Since coroutines are reported as unsupported, the call of the coroutine +also fails the property "coroutines are not supported" and ends the path. diff --git a/regression/cbmc-cpp/cpp20_probe_designated_initializer/main.cpp b/regression/cbmc-cpp/cpp20_probe_designated_initializer/main.cpp new file mode 100644 index 000000000000..d33a7e0ec816 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_probe_designated_initializer/main.cpp @@ -0,0 +1,12 @@ +// N5008 [dcl.init.aggr]: designated initializers. +extern "C" void __CPROVER_assert(bool, const char *); +struct S +{ + int a, b; +}; +int main() +{ + S s{.a = 1, .b = 2}; + __CPROVER_assert(s.a == 1 && s.b == 2, "designated initializers"); + __CPROVER_assert(false, "WRONG (must FAIL)"); +} diff --git a/regression/cbmc-cpp/cpp20_probe_designated_initializer/test.desc b/regression/cbmc-cpp/cpp20_probe_designated_initializer/test.desc new file mode 100644 index 000000000000..89af5bad9de4 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_probe_designated_initializer/test.desc @@ -0,0 +1,15 @@ +KNOWNBUG +main.cpp +--cpp20 +^\[main\.assertion\.1\] line \d+ designated initializers: SUCCESS$ +^\[main\.assertion\.2\] line \d+ WRONG \(must FAIL\): FAILURE$ +^\*\* 1 of \d+ failed +^VERIFICATION FAILED$ +^EXIT=10$ +^SIGNAL=0$ +-- +^warning: ignoring +^CONVERSION ERROR$ +-- +A probe of the C++20 support census (2026-11-05): designated initializers. +The last assertion is WRONG and must fail, so a pass is not vacuous. diff --git a/regression/cbmc-cpp/cpp20_probe_likely_no_unique_address/main.cpp b/regression/cbmc-cpp/cpp20_probe_likely_no_unique_address/main.cpp new file mode 100644 index 000000000000..151cf1e4f0f2 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_probe_likely_no_unique_address/main.cpp @@ -0,0 +1,19 @@ +// N5008 [dcl.attr.likelihood], [dcl.attr.nouniqueaddr]: [[likely]] and +// [[no_unique_address]] (Itanium C++ ABI layout). +extern "C" void __CPROVER_assert(bool, const char *); +struct E +{ +}; +struct S +{ + [[no_unique_address]] E e; + int x; +}; +int main() +{ + int r = 0; + if(r == 0) [[likely]] + r = 1; + __CPROVER_assert(r == 1 && sizeof(S) == sizeof(int), "attributes"); + __CPROVER_assert(false, "WRONG (must FAIL)"); +} diff --git a/regression/cbmc-cpp/cpp20_probe_likely_no_unique_address/test.desc b/regression/cbmc-cpp/cpp20_probe_likely_no_unique_address/test.desc new file mode 100644 index 000000000000..819a2d4ead0b --- /dev/null +++ b/regression/cbmc-cpp/cpp20_probe_likely_no_unique_address/test.desc @@ -0,0 +1,16 @@ +KNOWNBUG itanium-abi +main.cpp +--cpp20 +^\[main\.assertion\.1\] line \d+ attributes: SUCCESS$ +^\[main\.assertion\.2\] line \d+ WRONG \(must FAIL\): FAILURE$ +^\*\* 1 of \d+ failed +^VERIFICATION FAILED$ +^EXIT=10$ +^SIGNAL=0$ +-- +^warning: ignoring +^CONVERSION ERROR$ +-- +A probe of the C++20 support census (2026-11-05): [[likely]] and +[[no_unique_address]] (Itanium C++ ABI layout). The last assertion is WRONG +and must fail, so a pass is not vacuous. diff --git a/regression/cbmc-cpp/cpp20_probe_modules/m.cpp b/regression/cbmc-cpp/cpp20_probe_modules/m.cpp new file mode 100644 index 000000000000..e8c674cb7630 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_probe_modules/m.cpp @@ -0,0 +1,6 @@ +// N5008 [module.unit]: the primary module interface unit of module m. +export module m; +export int f() +{ + return 1; +} diff --git a/regression/cbmc-cpp/cpp20_probe_modules/main.cpp b/regression/cbmc-cpp/cpp20_probe_modules/main.cpp new file mode 100644 index 000000000000..ae6f43ea582d --- /dev/null +++ b/regression/cbmc-cpp/cpp20_probe_modules/main.cpp @@ -0,0 +1,8 @@ +// N5008 [module.import]: f is visible through the import of module m. +import m; +extern "C" void __CPROVER_assert(bool, const char *); +int main() +{ + __CPROVER_assert(f() == 1, "f from the imported module"); + __CPROVER_assert(false, "WRONG (must FAIL)"); +} diff --git a/regression/cbmc-cpp/cpp20_probe_modules/test.desc b/regression/cbmc-cpp/cpp20_probe_modules/test.desc new file mode 100644 index 000000000000..818004430ff8 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_probe_modules/test.desc @@ -0,0 +1,21 @@ +KNOWNBUG +main.cpp +--cpp20 m.cpp +^\[main\.assertion\.1\] line \d+ f from the imported module: SUCCESS$ +^\[main\.assertion\.2\] line \d+ WRONG \(must FAIL\): FAILURE$ +^\*\* 1 of \d+ failed +^VERIFICATION FAILED$ +^EXIT=10$ +^SIGNAL=0$ +-- +^warning: ignoring +^CONVERSION ERROR$ +-- +Modules ([module]) are not supported: `import m;' is not resolved, and main +fails to type-check (CONVERSION ERROR). A module interface unit on its own +is accepted (its `export module' declaration is ignored). Supporting +modules needs the translation units in dependency order, with the exported +declarations of each imported module (or header unit) visible in its +importers ([module.import]/2-3, [module.reach]), rather than CBMC's +preprocessed-source model. Checked with GCC 16 (g++ -std=c++20 -fmodules +m.cpp main.cpp): only the WRONG assertion fails. diff --git a/regression/cbmc-cpp/cpp20_probe_ranges_filter/main.cpp b/regression/cbmc-cpp/cpp20_probe_ranges_filter/main.cpp new file mode 100644 index 000000000000..19b18c50d4f3 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_probe_ranges_filter/main.cpp @@ -0,0 +1,13 @@ +// N5008 [range.filter]: iterating over std::views::filter. +#include +#include +extern "C" void __CPROVER_assert(bool, const char *); +int main() +{ + std::vector v{1, 2, 3, 4}; + int s = 0; + for(int x : v | std::views::filter([](int x) { return x % 2 == 0; })) + s += x; + __CPROVER_assert(s == 6, "views::filter"); + __CPROVER_assert(false, "WRONG (must FAIL)"); +} diff --git a/regression/cbmc-cpp/cpp20_probe_ranges_filter/test.desc b/regression/cbmc-cpp/cpp20_probe_ranges_filter/test.desc new file mode 100644 index 000000000000..c7a6e23588c1 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_probe_ranges_filter/test.desc @@ -0,0 +1,16 @@ +KNOWNBUG libstdcxx +main.cpp +--cpp20 --object-bits 12 --unwind 8 --no-unwinding-assertions +^\[main\.assertion\.1\] line \d+ views::filter: SUCCESS$ +^\[main\.assertion\.2\] line \d+ WRONG \(must FAIL\): FAILURE$ +^\*\* 1 of \d+ failed +^VERIFICATION FAILED$ +^EXIT=10$ +^SIGNAL=0$ +-- +^warning: ignoring +^CONVERSION ERROR$ +-- +A probe of the C++20 support census (2026-11-05): iterating over +std::views::filter. The last assertion is WRONG and must fail, so a pass is +not vacuous. diff --git a/regression/cbmc-cpp/cpp20_probe_requires_expression/main.cpp b/regression/cbmc-cpp/cpp20_probe_requires_expression/main.cpp new file mode 100644 index 000000000000..eb69ae06ab88 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_probe_requires_expression/main.cpp @@ -0,0 +1,16 @@ +// N5008 [expr.prim.req]: a requires-expression in a variable template. +extern "C" void __CPROVER_assert(bool, const char *); +template +constexpr bool has_size = requires(T t) { t.size(); }; +struct S +{ + int size() + { + return 0; + } +}; +int main() +{ + __CPROVER_assert(has_size && !has_size, "requires-expression"); + __CPROVER_assert(false, "WRONG (must FAIL)"); +} diff --git a/regression/cbmc-cpp/cpp20_probe_requires_expression/test.desc b/regression/cbmc-cpp/cpp20_probe_requires_expression/test.desc new file mode 100644 index 000000000000..c63ad9ef4ad3 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_probe_requires_expression/test.desc @@ -0,0 +1,16 @@ +KNOWNBUG +main.cpp +--cpp20 +^\[main\.assertion\.1\] line \d+ requires-expression: SUCCESS$ +^\[main\.assertion\.2\] line \d+ WRONG \(must FAIL\): FAILURE$ +^\*\* 1 of \d+ failed +^VERIFICATION FAILED$ +^EXIT=10$ +^SIGNAL=0$ +-- +^warning: ignoring +^CONVERSION ERROR$ +-- +A probe of the C++20 support census (2026-11-05): a requires-expression in a +variable template. The last assertion is WRONG and must fail, so a pass is +not vacuous. diff --git a/regression/cbmc-cpp/cpp20_probe_std_format/main.cpp b/regression/cbmc-cpp/cpp20_probe_std_format/main.cpp new file mode 100644 index 000000000000..5d89c1ce28b9 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_probe_std_format/main.cpp @@ -0,0 +1,10 @@ +// N5008 [format]: std::format of an int. +#include +#include +extern "C" void __CPROVER_assert(bool, const char *); +int main() +{ + std::string s = std::format("{}", 42); + __CPROVER_assert(s == "42", "format an int"); + __CPROVER_assert(false, "WRONG (must FAIL)"); +} diff --git a/regression/cbmc-cpp/cpp20_probe_std_format/test.desc b/regression/cbmc-cpp/cpp20_probe_std_format/test.desc new file mode 100644 index 000000000000..1f7e4c09f8f0 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_probe_std_format/test.desc @@ -0,0 +1,15 @@ +KNOWNBUG libstdcxx13 +main.cpp +--cpp20 --object-bits 12 --unwind 8 --no-unwinding-assertions +^\[main\.assertion\.1\] line \d+ format an int: SUCCESS$ +^\[main\.assertion\.2\] line \d+ WRONG \(must FAIL\): FAILURE$ +^\*\* 1 of \d+ failed +^VERIFICATION FAILED$ +^EXIT=10$ +^SIGNAL=0$ +-- +^warning: ignoring +^CONVERSION ERROR$ +-- +A probe of the C++20 support census (2026-11-05): std::format of an int. The +last assertion is WRONG and must fail, so a pass is not vacuous. diff --git a/regression/cbmc-cpp/cpp20_probe_std_span/main.cpp b/regression/cbmc-cpp/cpp20_probe_std_span/main.cpp new file mode 100644 index 000000000000..4822f64be5fe --- /dev/null +++ b/regression/cbmc-cpp/cpp20_probe_std_span/main.cpp @@ -0,0 +1,10 @@ +// N5008 [views.span]: a std::span over an array. +#include +extern "C" void __CPROVER_assert(bool, const char *); +int main() +{ + int a[] = {1, 2, 3}; + std::span s(a); + __CPROVER_assert(s.size() == 3 && s[1] == 2, "span over an array"); + __CPROVER_assert(false, "WRONG (must FAIL)"); +} diff --git a/regression/cbmc-cpp/cpp20_probe_std_span/test.desc b/regression/cbmc-cpp/cpp20_probe_std_span/test.desc new file mode 100644 index 000000000000..b4c618b8b1ba --- /dev/null +++ b/regression/cbmc-cpp/cpp20_probe_std_span/test.desc @@ -0,0 +1,15 @@ +KNOWNBUG libstdcxx +main.cpp +--cpp20 --object-bits 12 +^\[main\.assertion\.1\] line \d+ span over an array: SUCCESS$ +^\[main\.assertion\.2\] line \d+ WRONG \(must FAIL\): FAILURE$ +^\*\* 1 of \d+ failed +^VERIFICATION FAILED$ +^EXIT=10$ +^SIGNAL=0$ +-- +^warning: ignoring +^CONVERSION ERROR$ +-- +A probe of the C++20 support census (2026-11-05): a std::span over an array. +The last assertion is WRONG and must fail, so a pass is not vacuous. diff --git a/regression/cbmc-cpp/cpp20_probe_template_lambda/main.cpp b/regression/cbmc-cpp/cpp20_probe_template_lambda/main.cpp new file mode 100644 index 000000000000..143f0d28fd93 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_probe_template_lambda/main.cpp @@ -0,0 +1,9 @@ +// N5008 [expr.prim.lambda.general]: a lambda with a template parameter list. +extern "C" void __CPROVER_assert(bool, const char *); +int main() +{ + auto f = [](T) { return sizeof(T); }; + __CPROVER_assert( + f(1) == sizeof(int), "lambda with a template parameter list"); + __CPROVER_assert(false, "WRONG (must FAIL)"); +} diff --git a/regression/cbmc-cpp/cpp20_probe_template_lambda/test.desc b/regression/cbmc-cpp/cpp20_probe_template_lambda/test.desc new file mode 100644 index 000000000000..3b8c2c100cd0 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_probe_template_lambda/test.desc @@ -0,0 +1,16 @@ +KNOWNBUG +main.cpp +--cpp20 +^\[main\.assertion\.1\] line \d+ lambda with a template parameter list: SUCCESS$ +^\[main\.assertion\.2\] line \d+ WRONG \(must FAIL\): FAILURE$ +^\*\* 1 of \d+ failed +^VERIFICATION FAILED$ +^EXIT=10$ +^SIGNAL=0$ +-- +^warning: ignoring +^CONVERSION ERROR$ +-- +A probe of the C++20 support census (2026-11-05): a lambda with a template +parameter list. The last assertion is WRONG and must fail, so a pass is not +vacuous. diff --git a/regression/cbmc-cpp/cpp20_probe_three_way_comparison/main.cpp b/regression/cbmc-cpp/cpp20_probe_three_way_comparison/main.cpp new file mode 100644 index 000000000000..aec9b9b47d7d --- /dev/null +++ b/regression/cbmc-cpp/cpp20_probe_three_way_comparison/main.cpp @@ -0,0 +1,15 @@ +// N5008 [expr.spaceship], [class.compare.default]: defaulted three-way +// comparison. +#include +extern "C" void __CPROVER_assert(bool, const char *); +struct P +{ + int x, y; + auto operator<=>(const P &) const = default; +}; +int main() +{ + P a{1, 2}, b{1, 3}; + __CPROVER_assert(a < b && !(a == b), "defaulted three-way comparison"); + __CPROVER_assert(false, "WRONG (must FAIL)"); +} diff --git a/regression/cbmc-cpp/cpp20_probe_three_way_comparison/test.desc b/regression/cbmc-cpp/cpp20_probe_three_way_comparison/test.desc new file mode 100644 index 000000000000..d65d2dfee08b --- /dev/null +++ b/regression/cbmc-cpp/cpp20_probe_three_way_comparison/test.desc @@ -0,0 +1,17 @@ +KNOWNBUG libstdcxx +main.cpp +--cpp20 --object-bits 12 +^\[main\.assertion\.1\] line \d+ defaulted three-way comparison: SUCCESS$ +^\[main\.assertion\.2\] line \d+ WRONG \(must FAIL\): FAILURE$ +^\*\* 1 of \d+ failed +^VERIFICATION FAILED$ +^EXIT=10$ +^SIGNAL=0$ +-- +^warning: ignoring +^CONVERSION ERROR$ +-- +`a < b' is rewritten to (a <=> b) < 0; `a == b' uses the operator== that +a defaulted operator<=> implicitly declares ([class.compare.default]/4), +which CBMC did not declare: "no comparison operator for an operand of +class type" (cpp20_defaulted_spaceship_declares_equality). diff --git a/regression/cbmc-cpp/cpp20_probe_using_enum/main.cpp b/regression/cbmc-cpp/cpp20_probe_using_enum/main.cpp new file mode 100644 index 000000000000..c9954951713c --- /dev/null +++ b/regression/cbmc-cpp/cpp20_probe_using_enum/main.cpp @@ -0,0 +1,14 @@ +// N5008 [enum.udecl]: a using-enum-declaration. +extern "C" void __CPROVER_assert(bool, const char *); +enum class E +{ + a, + b +}; +int main() +{ + using enum E; + E e = b; + __CPROVER_assert(e == E::b, "using enum"); + __CPROVER_assert(false, "WRONG (must FAIL)"); +} diff --git a/regression/cbmc-cpp/cpp20_probe_using_enum/test.desc b/regression/cbmc-cpp/cpp20_probe_using_enum/test.desc new file mode 100644 index 000000000000..71aa347ab720 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_probe_using_enum/test.desc @@ -0,0 +1,15 @@ +KNOWNBUG +main.cpp +--cpp20 +^\[main\.assertion\.1\] line \d+ using enum: SUCCESS$ +^\[main\.assertion\.2\] line \d+ WRONG \(must FAIL\): FAILURE$ +^\*\* 1 of \d+ failed +^VERIFICATION FAILED$ +^EXIT=10$ +^SIGNAL=0$ +-- +^warning: ignoring +^CONVERSION ERROR$ +-- +A probe of the C++20 support census (2026-11-05): a using-enum-declaration. +The last assertion is WRONG and must fail, so a pass is not vacuous. diff --git a/regression/cbmc-cpp/cpp20_qualification_conversion_distinct_char_types/main.cpp b/regression/cbmc-cpp/cpp20_qualification_conversion_distinct_char_types/main.cpp new file mode 100644 index 000000000000..6da09930c73d --- /dev/null +++ b/regression/cbmc-cpp/cpp20_qualification_conversion_distinct_char_types/main.cpp @@ -0,0 +1,34 @@ +// N5008 [conv.qual]/3, [basic.fundamental]/7, /9, /17, /11: char, signed char, +// unsigned char and char8_t are distinct types, so a pointer to one does +// not convert to a pointer to another of the same representation (char +// is signed on x86-64 and unsigned on aarch64), and these calls are not +// ambiguous +extern "C" void __CPROVER_assert(bool, const char *); +int f(const char *) +{ + return 1; +} +int f(const signed char *) +{ + return 2; +} +int f(const unsigned char *) +{ + return 3; +} +int f(const char8_t *) +{ + return 4; +} +int main() +{ + char c[2] = "a"; + signed char s[2] = {1, 0}; + unsigned char u[2] = {1, 0}; + __CPROVER_assert(f(c) == 1 && f("a") == 1, "char"); + __CPROVER_assert(f(s) == 2, "signed char"); + __CPROVER_assert(f(u) == 3, "unsigned char"); + __CPROVER_assert(f(u8"a") == 4, "char8_t"); + __CPROVER_assert(f(c) == 2, "WRONG (must FAIL)"); + return 0; +} diff --git a/regression/cbmc-cpp/cpp20_qualification_conversion_distinct_char_types/test.desc b/regression/cbmc-cpp/cpp20_qualification_conversion_distinct_char_types/test.desc new file mode 100644 index 000000000000..305b06ebfd92 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_qualification_conversion_distinct_char_types/test.desc @@ -0,0 +1,17 @@ +KNOWNBUG +main.cpp +--cpp20 +^\[main\.assertion\.1\] line \d+ char: SUCCESS$ +^\[main\.assertion\.2\] line \d+ signed char: SUCCESS$ +^\[main\.assertion\.3\] line \d+ unsigned char: SUCCESS$ +^\[main\.assertion\.4\] line \d+ char8_t: SUCCESS$ +^\[main\.assertion\.5\] line \d+ WRONG \(must FAIL\): FAILURE$ +^VERIFICATION FAILED$ +^EXIT=10$ +^SIGNAL=0$ +-- +^warning: ignoring +^CONVERSION ERROR$ +-- +The qualification conversion compared the pointee types ignoring #c_type, +so a char * converted to a signed char * as if the types were the same. diff --git a/regression/cbmc-cpp/cpp20_qualification_conversion_distinct_char_types/test_arm64.desc b/regression/cbmc-cpp/cpp20_qualification_conversion_distinct_char_types/test_arm64.desc new file mode 100644 index 000000000000..9c1ba594fdd7 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_qualification_conversion_distinct_char_types/test_arm64.desc @@ -0,0 +1,17 @@ +KNOWNBUG +main.cpp +--cpp20 --arch arm64 +^\[main\.assertion\.1\] line \d+ char: SUCCESS$ +^\[main\.assertion\.2\] line \d+ signed char: SUCCESS$ +^\[main\.assertion\.3\] line \d+ unsigned char: SUCCESS$ +^\[main\.assertion\.4\] line \d+ char8_t: SUCCESS$ +^\[main\.assertion\.5\] line \d+ WRONG \(must FAIL\): FAILURE$ +^VERIFICATION FAILED$ +^EXIT=10$ +^SIGNAL=0$ +-- +^warning: ignoring +^CONVERSION ERROR$ +-- +As test.desc, for aarch64 (char is unsigned): u8"a" matched both +f(const char8_t *) and f(const char *) (cpp20_char8_t_distinct_type). diff --git a/regression/cbmc-cpp/cpp20_range_adaptor_closure_invoked_through_invoke_impl/main.cpp b/regression/cbmc-cpp/cpp20_range_adaptor_closure_invoked_through_invoke_impl/main.cpp new file mode 100644 index 000000000000..a87a6b73cbc8 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_range_adaptor_closure_invoked_through_invoke_impl/main.cpp @@ -0,0 +1,362 @@ +// N5008 [range.adaptor.object]/1, [func.require]/1: `a | views::transform(f)' +// calls the range adaptor closure object, which libstdc++ 16 does through +// std::__invoke and __invoke_impl (INVOKE of the _Partial closure object, +// whose operator() is a member template). This program is the libstdc++ 16 +// machinery for it, reduced with cvise (g++ 16 compiling and +// running each candidate, then g++ 13 and clang++ 18 doing the same, the +// compiler built-ins replaced by plain templates). +extern "C" void __CPROVER_assert(bool, const char *); +namespace std +{ +struct __conditional +{ + template + using type = _Up; +}; +template +using __conditional_t = __conditional::type<_If, _Else>; +template +_Up __declval(int); +template +auto declval() -> decltype(__declval<_Tp>(0)); +template +struct remove_reference; +template +struct remove_reference<_Tp &> +{ + using type = _Tp; +}; +template +using remove_reference_t = remove_reference<_Tp>::type; +template +using __decay_t = _Tp; +template +struct __success_type +{ + using type = _Tp; +}; +template +struct __result_of_impl; +template +__success_type()...))> _S_test(int); +template +struct __result_of_impl +{ + using type = decltype(_S_test<_Functor, _ArgTypes...>(0)); +}; +template +struct __invoke_result + : __result_of_impl::type +{ +}; +template +constexpr bool is_array_v = false; +template +constexpr bool is_array_v<_Tp[_N]> = true; +template +bool is_lvalue_reference_v; +template +constexpr bool is_lvalue_reference_v<_Tp &> = true; +template +constexpr bool is_same_v = false; +template +constexpr bool is_same_v<_Tp, _Tp> = true; +template +constexpr bool is_bounded_array_v = is_array_v<_Tp>; +namespace __detail +{ +template +concept __same_as = is_same_v<_Tp, _Up>; +} +template +concept same_as = __detail::__same_as<_Up, _Tp>; +namespace __detail +{ +template +concept __different_from = !same_as<_Tp, _Up>; +} +template +concept convertible_to = requires { _From(); }; +template +concept copy_constructible = convertible_to<_Tp, _Tp>; +template +void forward() +{ +} +namespace ranges::__access +{ +template +concept __member_begin = + requires(_Tp __t) { __decay_t(); }; +template +auto __begin(_Tp &__t) +{ + if constexpr(is_array_v<_Tp>) + return __t; + if constexpr(__member_begin<_Tp>) + return __t.begin(); +} +} // namespace ranges::__access +namespace __detail +{ +template +using __range_iter_t = decltype(ranges::__access::__begin(declval<_Tp &>())); +} +namespace ranges +{ +namespace __detail +{ +template +concept __maybe_borrowed_range = is_lvalue_reference_v<_Tp>; +} +namespace __access +{ +using __detail::__maybe_borrowed_range; +struct _Begin +{ + template <__maybe_borrowed_range _Tp> + auto operator()(_Tp &&__t) + { + return __t.begin(); + } +}; +template +concept __member_end = requires(_Tp __t) { __decay_t(); }; +struct _End +{ + template <__maybe_borrowed_range _Tp> + auto operator()(_Tp &&__t) + { + if constexpr(is_bounded_array_v>) + return __t; + if constexpr(__member_end<_Tp>) + return __t.end(); + } +}; +} // namespace __access +__access::_Begin begin; +__access::_End end; +template +concept range = requires { end; }; +template +using iterator_t = std::__detail::__range_iter_t<_Tp>; +template +using sentinel_t = decltype(end(declval<_Range &>())); +namespace __detail +{ +template +void __is_derived_from_view_interface_fn(); +template +concept __is_derived_from_view_interface = + requires { __is_derived_from_view_interface_fn; }; +} // namespace __detail +template +constexpr bool enable_view = __detail::__is_derived_from_view_interface<_Tp>; +template +concept view = enable_view<_Tp>; +template +concept input_range = same_as, sentinel_t<_Tp>>; +template +concept viewable_range = !view<_Tp>; +} // namespace ranges +template +_Res __invoke_impl(_Fn __f, _Args &&...__args) +{ + return __f(__args...); +} +template +__invoke_result<_Callable, _Args...>::type +__invoke(_Callable __fn, _Args &&...__args) +{ + return __invoke_impl::type>( + __fn, __args...); +} +namespace ranges +{ +namespace __detail +{ +using std::__detail::__different_from; +} +} // namespace ranges +template +struct _Binder +{ + template + _Binder(_Fn) + { + } + template + static auto _S_call(_Tp, _CallArgs &&...__call_args) + { + _Tp __trans_tmp_1 = forward<_Tp>, __trans_tmp_2 = forward<_Tp>; + return __invoke( + __trans_tmp_1._M_fd, __call_args..., __trans_tmp_2._M_bound_args); + } + _Fd _M_fd; + decltype(0) _M_bound_args; +}; +template +using _Bind_back_t = _Binder<0, _Fn, _Args...>; +namespace ranges +{ +namespace __detail +{ +struct _ViaPointer +{ + auto _M_call_deref() + { + return 0; + } +}; +template +auto __select() +{ + return _ViaPointer(); +} +template +using __func_handle_t = decltype(__select<_Iters...>()); +template +using __maybe_const_t = __conditional_t<_Const, _Tp, _Tp>; +} // namespace __detail +template +concept __adaptor_partial_app_viable = sizeof...(_Args) == 1; +template +struct _Partial; +template +auto operator|(_Range &&__r, _Self __self) +{ + return __self(__r); +} +template +struct _RangeAdaptor +{ + template + requires __adaptor_partial_app_viable<_Derived, _Args...> + auto operator()(_Args...) + { + return _Partial<_Derived, _Args...>{0, forward<_Args>...}; + } +}; +template +struct _Partial<_Adaptor, _Args...> +{ + using _Binder = _Bind_back_t<_Adaptor, _Args...>; + _Binder _M_binder; + template + _Partial(int, _Ts...) : _M_binder(forward<_Ts>...) + { + } + template + auto operator()(_Range &&__r) + { + return _Binder::_S_call(_M_binder, __r); + } +}; +template +struct ref_view +{ + _Range *_M_r; + template <__detail::__different_from _Tp> + ref_view(_Tp) + { + } + iterator_t<_Range> begin() + { + return *_M_r; + } + sentinel_t<_Range> end() + { + return *_M_r; + } +}; +template +ref_view(_Range &) -> ref_view<_Range>; +namespace views +{ +struct +{ + template + auto operator()(_Range &&__r) + { + return ref_view{__r}; + } +} all; +template +using all_t = decltype(all(declval<_Range>())); +} // namespace views +template +struct transform_view +{ + template + using _Base = __detail::__maybe_const_t<_Const, _Vp>; + template + struct _Iterator + { + using _Base = _Base<_Const>; + using _Base_iter = iterator_t<_Base>; + using _Func_handle = __detail:: + __func_handle_t<__detail::__maybe_const_t<_Const, _Fp>, _Base_iter>; + _Base_iter _M_current; + _Func_handle _M_fun; + _Iterator(__detail::__maybe_const_t<_Const, transform_view> *, _Base_iter) + { + } + auto operator*() + { + return _M_fun._M_call_deref(); + } + void operator++() + { + } + friend bool operator==(_Iterator, _Iterator __y) + { + return __y._M_current; + } + }; + _Vp _M_base; + transform_view(_Vp, _Fp __fun) : _M_base(__fun) + { + } + _Iterator begin() + { + return {this, ranges::begin(_M_base)}; + } + _Iterator end() + { + return {this, ranges::end(_M_base)}; + } +}; +template +transform_view(_Range &&, _Fp) -> transform_view, _Fp>; +namespace views +{ +struct _Transform : _RangeAdaptor<_Transform> +{ + template + auto operator()(_Range &&__r, _Fp __f) + { + return transform_view(__r, __f); + } + using _RangeAdaptor::operator(); +} transform; +} // namespace views +} // namespace ranges +namespace views = ranges::views; +} // namespace std +// The reduced iterator does not advance: the range-for is instantiated but +// never executed. +void transform_loop() +{ + int a[1] = {5}; + auto lam = [] {}; + for(int x : a | std::views::transform(lam)) + (void)x; +} + +int main() +{ + int reached = 1; + __CPROVER_assert(reached == 1, "converted"); + __CPROVER_assert(reached == 2, "WRONG (must FAIL)"); + return 0; +} diff --git a/regression/cbmc-cpp/cpp20_range_adaptor_closure_invoked_through_invoke_impl/test.desc b/regression/cbmc-cpp/cpp20_range_adaptor_closure_invoked_through_invoke_impl/test.desc new file mode 100644 index 000000000000..c77a678f6026 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_range_adaptor_closure_invoked_through_invoke_impl/test.desc @@ -0,0 +1,20 @@ +KNOWNBUG +main.cpp +--cpp20 +^\[main\.assertion\.1\] line \d+ converted: SUCCESS$ +^\[main\.assertion\.2\] line \d+ WRONG \(must FAIL\): FAILURE$ +^VERIFICATION FAILED$ +^EXIT=10$ +^SIGNAL=0$ +-- +dropped the body +-- +__invoke_impl<_Partial<_Transform, ...>> and __invoke kept their bodies +only when the call of the _Partial closure object selected its +two-parameter operator() template. Inside __invoke, instantiated from +_Binder::_S_call in _Partial::operator(), the pack expansion in +`typename decltype(_S_test<_Callable, _Args...>(0))::type' kept one +element: the single-element pack substitution of the body removed every +ellipsis, including those of patterns naming only __invoke's own +two-element pack. N5008 [temp.variadic]/8-9. The header-free reduction +is cpp20_call_result_through_pack_in_static_member_template. diff --git a/regression/cbmc-cpp/cpp20_range_for_init/main.cpp b/regression/cbmc-cpp/cpp20_range_for_init/main.cpp new file mode 100644 index 000000000000..1c9defb47ca8 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_range_for_init/main.cpp @@ -0,0 +1,12 @@ +// C++20 init-statement in range-based for +int main() +{ + int arr[] = {1, 2, 3}; + int sum = 0; + for(int s = 0; int x : arr) + { + sum += x; + } + __CPROVER_assert(sum == 6, "range for with init"); + return 0; +} diff --git a/regression/cbmc-cpp/cpp20_range_for_init/test.desc b/regression/cbmc-cpp/cpp20_range_for_init/test.desc new file mode 100644 index 000000000000..97f462b9092e --- /dev/null +++ b/regression/cbmc-cpp/cpp20_range_for_init/test.desc @@ -0,0 +1,10 @@ +KNOWNBUG +main.cpp +--cpp20 +^VERIFICATION SUCCESSFUL$ +^EXIT=0$ +^SIGNAL=0$ +-- +dropped the body +-- +C++20 init-statement in range-based for loop diff --git a/regression/cbmc-cpp/cpp20_range_pipe_crtp_closure/main.cpp b/regression/cbmc-cpp/cpp20_range_pipe_crtp_closure/main.cpp new file mode 100644 index 000000000000..738efb9f1ccf --- /dev/null +++ b/regression/cbmc-cpp/cpp20_range_pipe_crtp_closure/main.cpp @@ -0,0 +1,46 @@ +extern "C" void __CPROVER_assert(bool, const char *); +template +constexpr bool is_lvalue_reference_v = false; +template +constexpr bool is_lvalue_reference_v<_Tp &> = true; +namespace ranges +{ +template +concept viewable_range = is_lvalue_reference_v<_Tp>; +template +struct __range_adaptor_closure +{ + template + friend auto operator|(_View &&__view, _Closure &&__closure) + { + return __closure(__view); + } +}; +struct __take_closure : __range_adaptor_closure<__take_closure> +{ + int __n; + template + auto operator()(_Range &&__r) const + { + return __r[__n - 2]; + } +}; +struct __take_fn +{ + __take_closure operator()(int __n) const + { + return __take_closure{{}, __n}; + } +}; +} // namespace ranges +namespace views +{ +inline constexpr ranges::__take_fn take{}; +} +int main() +{ + int arr[] = {1, 2, 3, 4, 5}; + int r = arr | views::take(3); + __CPROVER_assert(r == 2, "range pipe through CRTP closure"); + return 0; +} diff --git a/regression/cbmc-cpp/cpp20_range_pipe_crtp_closure/test.desc b/regression/cbmc-cpp/cpp20_range_pipe_crtp_closure/test.desc new file mode 100644 index 000000000000..9a327c381558 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_range_pipe_crtp_closure/test.desc @@ -0,0 +1,17 @@ +KNOWNBUG +main.cpp +--cpp20 +^\[main\.assertion\.1\] line 44 range pipe through CRTP closure: SUCCESS$ +^VERIFICATION SUCCESSFUL$ +^EXIT=0$ +^SIGNAL=0$ +-- +dropped the body +-- +End-to-end range-pipe shape mirroring libc++ views::take: a CRTP +__range_adaptor_closure base with a hidden friend template operator| +([temp.friend]/1), a take-closure created by aggregate initialization +with an empty-base element ([dcl.init.aggr]/2.2), and an array lvalue +binding the constrained forwarding reference ([temp.deduct.call]/2-3). +Exercises the round-123 friend-hoist and aggregate-base fixes +together. diff --git a/regression/cbmc-cpp/cpp20_ranges_basic/main.cpp b/regression/cbmc-cpp/cpp20_ranges_basic/main.cpp new file mode 100644 index 000000000000..a91ae7ca2775 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_ranges_basic/main.cpp @@ -0,0 +1,19 @@ +#if __has_include() +// C++20 std::ranges basic usage +# include + +int main() +{ + int arr[] = {1, 2, 3, 4, 5}; + int sum = 0; + for(auto x : arr | std::views::take(3)) + sum += x; + __CPROVER_assert(sum == 6, "ranges take"); + return 0; +} + +#else +int main() +{ +} +#endif diff --git a/regression/cbmc-cpp/cpp20_ranges_basic/test.desc b/regression/cbmc-cpp/cpp20_ranges_basic/test.desc new file mode 100644 index 000000000000..98271eb463b1 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_ranges_basic/test.desc @@ -0,0 +1,36 @@ +KNOWNBUG +main.cpp +--cpp20 +^\[main\.assertion\.1\] line \d+ ranges take: SUCCESS$ +^VERIFICATION SUCCESSFUL$ +^EXIT=0$ +^SIGNAL=0$ +-- +^warning: ignoring +^CONVERSION ERROR$ +-- + +Was KNOWNBUG since round 152 ("conversion from 'signed int [5l]' to 'struct +_Partial'"). Fixed 2026-09-24 by seven front-end fixes along the libstdc++ +range-adaptor chain: [dcl.init.aggr]/1 a constructor template disqualifies +the aggregate (ref_view{arr}); [temp.spec.partial.order] variable-template +partial specializations are ordered (extent_v); [temp.deduct.call]/3 +no forwarding reference in a constructor-derived deduction guide and +[dcl.init.general]/10 value-initialising a reference is an error +(owning_view{declval()}); [temp.res.general]/1 a requires-clause +is looked up from the template's scope (the hidden friend operator|); +[temp.variadic]/9 `Args...` in a requires-clause concept-id expands to the +deduced arity (__adaptor_partial_app_viable); [stmt.if]/2 no return type +deduction from a discarded `if constexpr` branch (_All::operator()); +[temp.inst]/4 a body whose eager conversion fails while a class is being +elaborated is re-queued instead of dropped (view_interface members and the +ranges::begin(ref_view&) instance). Exercised by the cpp20_ranges_* unit +tests. +With the libstdc++ 16 headers `arr | views::take(3)' was rejected (tagged +broken-libstdcxx16); the root cause, +cpp20_concept_disjunction_first_operand_substitution_failure, is fixed, and +the test passes with GCC 16.2.1. +With the MSVC STL (VS 2022 14.44 and VS 2026 14.51, checked from the CI +artifacts) the test runs too; it needed the fixes for constexpr static +data members of class type, requires-clauses, explicit template template +arguments and requires-expression parameters. diff --git a/regression/cbmc-cpp/cpp20_ranges_basic_libcxx/main.cpp b/regression/cbmc-cpp/cpp20_ranges_basic_libcxx/main.cpp new file mode 100644 index 000000000000..b97445ebad64 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_ranges_basic_libcxx/main.cpp @@ -0,0 +1,19 @@ +#if !defined(_MSC_VER) && __has_include() +// C++20 std::ranges basic usage +# include + +int main() +{ + int arr[] = {1, 2, 3, 4, 5}; + int sum = 0; + for(auto x : arr | std::views::take(3)) + sum += x; + __CPROVER_assert(sum == 6, "ranges take"); + return 0; +} + +#else +int main() +{ +} +#endif diff --git a/regression/cbmc-cpp/cpp20_ranges_basic_libcxx/reduced.cpp b/regression/cbmc-cpp/cpp20_ranges_basic_libcxx/reduced.cpp new file mode 100644 index 000000000000..b8a02d318797 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_ranges_basic_libcxx/reduced.cpp @@ -0,0 +1,85 @@ +# 1 "/usr/lib/llvm-18/lib/clang/18/include/__stddef_offsetof.h" +namespace std +{ +template +constexpr bool is_lvalue_reference_v = __is_lvalue_reference(_Tp); +template +constexpr bool is_convertible_v = __is_convertible(_From, _To); +template +concept convertible_to = requires { _From(); }; +template +concept derived_from = is_convertible_v<_Dp, _Bp>; +template +struct integer_sequence; +template +struct __perfect_forward_impl; +template +struct __perfect_forward_impl< + _Op, + integer_sequence, + _BoundArgs...> +{ + template + auto operator()(_Args... __args) -> decltype(_Op()(_Idx..., __args...)); +}; +template +using __perfect_forward = + __perfect_forward_impl<_Op, integer_sequence>; +namespace ranges +{ +template +concept viewable_range = is_lvalue_reference_v<_Tp>; +} +template +struct __range_adaptor_closure; +template +struct __range_adaptor_closure_t : _Fn, __range_adaptor_closure<_Fn> +{ +}; +template +concept _RangeAdaptorClosure = derived_from<_Tp, _Tp>; +template +struct __range_adaptor_closure +{ + template + friend auto operator|(_View &&__view, _Closure __closure) + { + return __closure(__view); + } +}; +template +struct __bind_back_t : __perfect_forward<_Fn, int> +{ +}; +template +auto __bind_back(_Fn...) -> decltype(__bind_back_t<_Fn>()); +namespace ranges +{ +template +struct take_view +{ + _View __base_; + _View __count_; + int *begin(); + int *end(); +}; +struct Trans_NS___take___fn +{ + template _Np> + auto operator()(_Range, _Np __n) -> decltype(take_view(__n)); + template + auto operator()(_Np) + { + return __range_adaptor_closure_t(__bind_back(*this, _Np())); + } +} take; +} // namespace ranges +namespace views = ranges; +} // namespace std +# 4 "" +int main() +{ + int arr; + for(auto x : arr | std::views::take(3)) + __CPROVER_assert; +} diff --git a/regression/cbmc-cpp/cpp20_ranges_basic_libcxx/reduced2.cpp b/regression/cbmc-cpp/cpp20_ranges_basic_libcxx/reduced2.cpp new file mode 100644 index 000000000000..38fd632eef37 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_ranges_basic_libcxx/reduced2.cpp @@ -0,0 +1,1035 @@ +void __CPROVER_assert(bool, char *); +namespace +{ +template +struct integral_constant +{ + static const _Tp value = __v; +}; +template +using _BoolConstant = integral_constant; +template +using bool_constant = integral_constant; +template +constexpr bool is_class_v = __is_class(_Tp); +template +constexpr bool is_enum_v = __is_enum(_Tp); +template +constexpr bool is_union_v = __is_union(_Tp); +template +concept __class_or_enum = is_class_v<_Tp> || is_union_v<_Tp> || is_enum_v<_Tp>; +template +using __remove_cv_t = __remove_cv(_Tp); +template +using remove_cv_t = __remove_cv_t<_Tp>; +template +constexpr bool is_integral_v = __is_integral(_Tp); +template +constexpr bool is_signed_v = __is_signed(_Tp); +template +concept integral = is_integral_v<_Tp>; +template +concept signed_integral = integral<_Tp> && is_signed_v<_Tp>; +} // namespace +namespace __attribute__(()) std +{ + inline namespace + { + template + constexpr bool is_convertible_v = __is_convertible(_From, _To); + template + _Tp &&__declval(int); + template + __attribute__(()) __attribute__(()) + __attribute__(()) decltype(std::__declval<_Tp>(0)) + declval(); + template + concept convertible_to = is_convertible_v<_From, _To> && requires { + static_cast<_To>(std::declval<_From>()); + }; + template + using _IsSame = _BoolConstant<__is_same(_Tp, _Up)>; + template + concept __same_as_impl = _IsSame<_Tp, _Up>::value; + template + concept same_as = __same_as_impl<_Tp, _Up> && __same_as_impl<_Up, _Tp>; + template + using __add_pointer_t = __add_pointer(_Tp); + template + using add_pointer_t = __add_pointer_t<_Tp>; + template + struct _IfImpl; + template <> + struct _IfImpl + { + template + using _Select = _IfRes; + }; + template <> + struct _IfImpl + { + template + using _Select = _ElseRes; + }; + template + using _If = _IfImpl<_Cond>::template _Select<_IfRes, _ElseRes>; + template + struct conditional + { + using type = _If<_Bp, _IfRes, _ElseRes>; + }; + template + using conditional_t = conditional<_Bp, _IfRes, _ElseRes>::type; + } // namespace + namespace + { + template + using __decay_t = __decay(_Tp); + template + using decay_t = __decay_t<_Tp>; + template + using __remove_cvref_t = __remove_cvref(_Tp); + template + using remove_cvref_t = __remove_cvref_t<_Tp>; + template + using __void_t = void; + struct __copy_cv + { + template + using __apply = _To; + }; + template + using __copy_cv_t = __copy_cv::__apply<_To>; + template + using __add_rvalue_reference_t = __add_rvalue_reference(_Tp); + } // namespace + namespace + { + template + constexpr bool is_reference_v = __is_reference(_Tp); + template + constexpr bool is_lvalue_reference_v = __is_lvalue_reference(_Tp); + template + using __libcpp_remove_reference_t = __remove_reference_t(_Tp); + template + using remove_reference_t = __libcpp_remove_reference_t<_Tp>; + template + using __cond_res = + decltype(false ? std::declval<_Xp()>()() : std::declval<_Yp()>()()); + template < + class _Ap, + class _Bp, + class = remove_reference_t<_Ap>, + class = remove_reference_t<_Bp>> + struct __common_ref; + template + struct __common_ref : __common_ref<_Bp, _Ap> + { + }; + template + using __common_ref_t = __common_ref<_Xp, _Yp>::__type; + template + using __cv_cond_res = + __cond_res<__copy_cv_t<_Xp, _Yp> &, __copy_cv_t<_Yp, _Xp> &>; + template + requires requires { typename __cv_cond_res<_Xp, _Yp>; } && + is_reference_v<__cv_cond_res<_Xp, _Yp>> + struct __common_ref<_Ap, _Bp &, _Xp, _Yp> + { + using __type = __cv_cond_res<_Xp, _Yp>; + }; + template + using __common_ref_D = __common_ref_t; + template + requires requires { typename __common_ref_D<_Xp, _Yp>; } && + is_convertible_v<_Ap, __common_ref_D<_Xp, _Yp>> + struct __common_ref<_Ap &&, _Bp &, _Xp, _Yp> + { + using __type = __common_ref_D<_Xp, _Yp>; + }; + template + struct common_reference; + template + using common_reference_t = common_reference<_Types...>::type; + template + struct __common_reference_sub_bullet1; + template + struct common_reference<_Tp, _Up> : __common_reference_sub_bullet1<_Tp, _Up> + { + }; + template + requires is_reference_v<_Tp> && is_reference_v<_Up> && + requires { typename __common_ref_t<_Tp, _Up>; } && + is_convertible_v< + add_pointer_t<_Tp>, + add_pointer_t<__common_ref_t<_Tp, _Up>>> && + is_convertible_v< + add_pointer_t<_Up>, + add_pointer_t<__common_ref_t<_Tp, _Up>>> + struct __common_reference_sub_bullet1<_Tp, _Up> + { + using type = __common_ref_t<_Tp, _Up>; + }; + template + concept common_reference_with = + same_as, common_reference_t<_Up, _Tp>> && + convertible_to<_Tp, common_reference_t<_Tp, _Up>> && + convertible_to<_Up, common_reference_t<_Tp, _Up>>; + template + using __make_const_lvalue_ref = __libcpp_remove_reference_t<_Tp> &; + template + __attribute__(()) __attribute__(()) __attribute__(()) _Tp + forward(__libcpp_remove_reference_t<_Tp> &); + template + concept assignable_from = is_lvalue_reference_v<_Lhs> && + common_reference_with< + __make_const_lvalue_ref<_Lhs>, + __make_const_lvalue_ref<_Rhs>> && + requires(_Lhs __lhs, _Rhs __rhs) { + { + __lhs = std::forward<_Rhs>(__rhs) + } -> same_as<_Lhs>; + }; + template + constexpr bool is_nothrow_destructible_v = + integral_constant::value; + template + concept destructible = is_nothrow_destructible_v<_Tp>; + template + constexpr bool is_constructible_v = __is_constructible(_Tp, _Args...); + template + constexpr bool is_move_constructible_v = integral_constant< + bool, + __is_constructible(int, __add_rvalue_reference_t)>::value; + template + concept constructible_from = + destructible<_Tp> && is_constructible_v<_Tp, _Args...>; + template + concept __default_initializable = requires { ::new _Tp; }; + template + concept default_initializable = constructible_from<_Tp> && requires { + _Tp{}; + } && __default_initializable<_Tp>; + template + concept move_constructible = + constructible_from<_Tp, _Tp> && convertible_to<_Tp, _Tp>; + template + concept copy_constructible = + move_constructible<_Tp> && constructible_from<_Tp, _Tp> && + convertible_to<_Tp, _Tp> && constructible_from<_Tp, _Tp> && + convertible_to<_Tp, _Tp> && constructible_from<_Tp, _Tp> && + convertible_to<_Tp, _Tp>; + typedef int type; + template + using enable_if_t = type; + template + __attribute__(()) __attribute__(()) + __attribute__(()) __libcpp_remove_reference_t<_Tp> + move(_Tp); + namespace ranges + { + inline namespace + { + auto swap = int{}; + } + } // namespace ranges + template + concept swappable = requires { ranges::swap; }; + template + constexpr bool is_object_v = __is_object(_Tp); + template + concept movable = is_object_v<_Tp> && move_constructible<_Tp> && + assignable_from<_Tp &, _Tp> && swappable<_Tp>; + template + concept copyable = + copy_constructible<_Tp> && movable<_Tp> && assignable_from<_Tp &, _Tp> && + assignable_from<_Tp &, _Tp> && assignable_from<_Tp &, _Tp>; + template + constexpr bool is_base_of_v = __is_base_of(_Bp, _Dp); + template + concept derived_from = + is_base_of_v<_Bp, _Dp> && is_convertible_v<_Dp *, _Bp *>; + template + concept __boolean_testable_impl = convertible_to<_Tp, bool>; + template + concept __boolean_testable = __boolean_testable_impl<_Tp> && + requires() + { + { + std::forward<_Tp> + } -> __boolean_testable_impl; + }; + template < + class _Tp, + class _Up, + class _CommonRef = common_reference_t<_Tp &, const _Up &>> + concept __comparison_common_type_with_impl = + same_as< + common_reference_t<_Tp &, const _Up &>, + common_reference_t<_Up &, const _Tp &>> && + requires { + convertible_to<_Up, _CommonRef> || convertible_to<_Up, _CommonRef>; + }; + template + concept __comparison_common_type_with = __comparison_common_type_with_impl< + remove_cvref_t<_Tp>, + remove_cvref_t<_Up>>; + template + concept __weakly_equality_comparable_with = requires( + __make_const_lvalue_ref<_Tp> __t, + __make_const_lvalue_ref<_Up> __u) { + { __u != __t } -> __boolean_testable; + }; + template + concept equality_comparable = __weakly_equality_comparable_with<_Tp, _Tp>; + template + concept equality_comparable_with = + equality_comparable<_Tp> && equality_comparable<_Up> && + __comparison_common_type_with<_Tp, _Up> && + equality_comparable, + __make_const_lvalue_ref<_Up>>> && + __weakly_equality_comparable_with<_Tp, _Up>; + template + struct __invoke_result_impl + { + using type = decltype(__builtin_invoke(std::declval<_Args>()...)); + }; + template + using __invoke_result = __invoke_result_impl; + template + using __invoke_result_t = __invoke_result<_Args...>::type; + template + const bool __is_invocable_impl = false; + template + constexpr bool is_invocable_v = __is_invocable_impl; + template + using invoke_result_t = __invoke_result_t<_Fn, _Args...>; + template + __attribute__(()) __attribute__(()) + __attribute__(()) invoke_result_t<_Fn, _Args...> + invoke(_Fn, _Args &&...); + template + concept invocable = requires(_Fn __fn, _Args... __args) { + std::invoke(std::forward<_Fn>(__fn), std::forward<_Args>(__args)...); + }; + template + concept regular_invocable = invocable<_Fn, _Args...>; + template + concept predicate = regular_invocable<_Fn, _Args...> && + __boolean_testable>; + template + concept __primary_template = + requires { _IsSame::value; }; + template + concept __referenceable = requires { typename __void_t<>; }; + template + concept semiregular = copyable<_Tp> && default_initializable<_Tp>; + template + concept regular = semiregular<_Tp> && equality_comparable<_Tp>; + template + concept relation = predicate<_Rp, _Tp, _Tp> && predicate<_Rp, _Up, _Up> && + predicate<_Rp, _Tp, _Up> && predicate<_Rp, _Up, _Tp>; + template + concept strict_weak_order = relation<_Rp, _Tp, _Up>; + template + concept __partially_ordered_with = requires( + __make_const_lvalue_ref<_Tp> __t, + __make_const_lvalue_ref<_Up> __u) { + { __u >= __t } -> __boolean_testable; + }; + template + concept totally_ordered = + equality_comparable<_Tp> && __partially_ordered_with<_Tp, _Tp>; + template + concept totally_ordered_with = totally_ordered<_Tp> && totally_ordered<_Up> && + equality_comparable_with<_Tp, _Up> && + totally_ordered, + __make_const_lvalue_ref<_Up>>> && + __partially_ordered_with<_Tp, _Up>; + using ptrdiff_t = + decltype(static_cast(nullptr) - static_cast(nullptr)); + template + struct iterator_traits + { + using __primary_template = iterator_traits; + }; + template + using iter_difference_t = conditional_t< + __primary_template>>, + int, + iterator_traits>>::difference_type; + template + struct tuple_element; + template + class tuple; + template + struct tuple_element<_Ip, tuple<_Tp...>> + { + using type = __type_pack_element<_Ip, _Tp...>; + }; + template + __attribute__(()) __attribute__(()) + __attribute__(()) tuple_element<_Ip, tuple<_Tp...>>::type + get(const tuple<_Tp...>); + template + struct __cond_value_type; + template + requires is_object_v<_Tp> + struct __cond_value_type<_Tp> + { + using value_type = remove_cv_t<_Tp>; + }; + template + concept __has_member_value_type = requires { typename _Tp::value_type; }; + template + struct indirectly_readable_traits; + template <__has_member_value_type _Tp> + struct indirectly_readable_traits<_Tp> + : __cond_value_type + { + }; + template + struct _OrImpl; + template <> + struct _OrImpl + { + template + using _Result = _OrImpl:: + template _Result<_First, _Rest...>; + }; + template <> + struct _OrImpl + { + template + using _Result = _Res; + }; + template + using _Or = _OrImpl:: + template _Result, _Args...>; + template + concept __dereferenceable = requires(_Tp __t) { + { __t } -> __referenceable; + }; + template <__dereferenceable _Tp> + using iter_reference_t = decltype(*std::declval<_Tp>()); + struct input_iterator_tag + { + }; + struct forward_iterator_tag : input_iterator_tag + { + }; + struct bidirectional_iterator_tag : forward_iterator_tag + { + }; + struct random_access_iterator_tag : bidirectional_iterator_tag + { + }; + struct contiguous_iterator_tag : random_access_iterator_tag + { + }; + template + requires is_object_v<_Tp> + struct iterator_traits<_Tp *> + { + typedef ptrdiff_t difference_type; + typedef __remove_cv_t<_Tp> value_type; + typedef contiguous_iterator_tag iterator_concept; + }; + template + using iter_value_t = conditional_t< + __primary_template>>, + indirectly_readable_traits>, + iterator_traits>>::value_type; + namespace ranges + { + template + concept __unqualified_iter_move = __class_or_enum> && + requires { iter_move(std::forward<_Tp>); }; + template + concept __move_deref = !__unqualified_iter_move<_Tp> && requires(_Tp __t) { + is_lvalue_reference_v; + }; + struct Trans_NS___iter_move___fn + { + template + requires __move_deref<_Ip> + __attribute__(()) __attribute__(()) __attribute__(()) auto + operator()(_Ip __i) const -> decltype(std::move(*std::forward<_Ip>(__i))); + }; + inline namespace + { + auto iter_move = Trans_NS___iter_move___fn{}; + } + } // namespace ranges + template <__dereferenceable _Tp> + requires requires { + { ranges::iter_move } -> __referenceable; + } + using iter_rvalue_reference_t = + decltype(ranges::iter_move(std::declval<_Tp>())); + template + concept __indirectly_readable_impl = + requires(_In __i) { + { ranges::iter_move(__i) } -> same_as>; + } && common_reference_with, iter_value_t<_In> &> && + common_reference_with< + iter_reference_t<_In>, + iter_rvalue_reference_t<_In> &&> && + common_reference_with &&, iter_value_t<_In> &>; + template + concept indirectly_readable = __indirectly_readable_impl>; + template + struct __indirect_value_t_impl + { + using type = iter_value_t<_Tp>; + }; + template + using __indirect_value_t = __indirect_value_t_impl<_Tp>::type; + template + concept __integer_like = integral<_Tp> && same_as<_Tp, bool>; + template + concept __signed_integer_like = signed_integral<_Tp>; + template + concept weakly_incrementable = + movable<_Ip> && requires { __signed_integer_like>; }; + template + concept incrementable = + regular<_Ip> && weakly_incrementable<_Ip> && requires(_Ip __i) { + { __i++ } -> same_as<_Ip>; + }; + template + concept input_or_output_iterator = requires(_Ip __i) { + { __i } -> __referenceable; + } && weakly_incrementable<_Ip>; + template + concept sentinel_for = semiregular<_Sp> && input_or_output_iterator<_Ip> && + __weakly_equality_comparable_with<_Sp, _Ip>; + template + constexpr bool disable_sized_sentinel_for = false; + template + concept sized_sentinel_for = + sentinel_for<_Sp, _Ip> && + !disable_sized_sentinel_for, remove_cv_t<_Ip>> && + requires(_Ip __i, _Sp __s) { + { __i - __s } -> same_as>; + }; + template + struct __iter_traits_cache + { + using type = _If< + __primary_template>, + _Iter, + iterator_traits<_Iter>>; + }; + template + using _ITER_TRAITS = __iter_traits_cache<_Iter>::type; + struct __iter_concept_concept_test + { + template + using _Apply = _ITER_TRAITS<_Iter>::iterator_concept; + }; + template + struct __test_iter_concept : bool_constant < requires + { + typename _Tester::template _Apply<_Iter>; + } >, _Tester{}; + template + struct __iter_concept_cache + { + using type = _Or< + __test_iter_concept<_Iter, __iter_concept_concept_test>, + __test_iter_concept<_Iter, int>, + __test_iter_concept<_Iter, int>>; + }; + template + using _ITER_CONCEPT = + __iter_concept_cache<_Iter>::type::template _Apply<_Iter>; + template + concept input_iterator = + input_or_output_iterator<_Ip> && indirectly_readable<_Ip> && requires { + typename _ITER_CONCEPT<_Ip>; + } && derived_from<_ITER_CONCEPT<_Ip>, input_iterator_tag>; + template + concept forward_iterator = + input_iterator<_Ip> && + derived_from<_ITER_CONCEPT<_Ip>, forward_iterator_tag> && + incrementable<_Ip> && sentinel_for<_Ip, _Ip>; + template + concept bidirectional_iterator = + forward_iterator<_Ip> && + derived_from<_ITER_CONCEPT<_Ip>, bidirectional_iterator_tag> && + requires(_Ip __i) { + { __i-- } -> same_as<_Ip>; + }; + template + concept random_access_iterator = + bidirectional_iterator<_Ip> && + derived_from<_ITER_CONCEPT<_Ip>, random_access_iterator_tag> && + totally_ordered<_Ip> && sized_sentinel_for<_Ip, _Ip> && + requires(_Ip, _Ip __j, iter_difference_t<_Ip> __n) { + { __j[__n] } -> same_as>; + }; + template + concept indirectly_regular_unary_invocable = + indirectly_readable<_It> && copy_constructible<_Fp> && + regular_invocable<_Fp, __indirect_value_t<_It>> && + regular_invocable<_Fp, iter_reference_t<_It>> && + common_reference_with< + invoke_result_t<_Fp, __indirect_value_t<_It>>, + invoke_result_t<_Fp, iter_reference_t<_It>>>; + template + concept indirect_strict_weak_order = + indirectly_readable<_It1> && indirectly_readable<_It2> && + copy_constructible<_Fp> && + strict_weak_order< + _Fp, + __indirect_value_t<_It1>, + __indirect_value_t<_It2>> && + strict_weak_order<_Fp, __indirect_value_t<_It1>, iter_reference_t<_It2>> && + strict_weak_order<_Fp, iter_reference_t<_It1>, __indirect_value_t<_It2>> && + strict_weak_order<_Fp, iter_reference_t<_It1>, iter_reference_t<_It2>>; + template + requires(indirectly_readable<_Its> && ...) && + invocable<_Fp, iter_reference_t<_Its>...> + using indirect_result_t = invoke_result_t<_Fp, iter_reference_t<_Its>...>; + namespace ranges + { + template + bool enable_borrowed_range = false; + template + concept __can_borrow = + is_lvalue_reference_v<_Tp> || enable_borrowed_range>; + template + concept __member_begin = __can_borrow<_Tp> && requires(_Tp __t) { + { + static_cast<::std::__decay_t>(__t.begin()) + } -> input_or_output_iterator; + }; + struct Trans_NS___begin___fn + { + template + __attribute__(()) __attribute__(()) __attribute__(()) auto + operator()(_Tp (&__t)[_Np]) const + requires(sizeof(_Tp) >= 0) + { + return __t + 0; + } + template + requires __member_begin<_Tp> + __attribute__(()) __attribute__(()) __attribute__(()) auto + operator()(_Tp &&__t) const + { + return static_cast<::std::__decay_t>( + __t.begin()); + } + }; + inline namespace + { + auto begin = Trans_NS___begin___fn{}; + } + template + using iterator_t = decltype(ranges::begin(std::declval<_Tp &>())); + template + concept __member_end = __can_borrow<_Tp> && requires(_Tp __t) { + { + static_cast<::std::__decay_t>(__t.end()) + } -> sentinel_for>; + }; + struct Trans_NS___end___fn + { + template + __attribute__(()) __attribute__(()) __attribute__(()) auto + operator()(_Tp (&__t)[_Np]) const + requires(sizeof(_Tp) >= 0) + { + return __t + _Np; + } + template + requires __member_end<_Tp> + __attribute__(()) __attribute__(()) __attribute__(()) auto + operator()(_Tp &&__t) const + { + return static_cast<::std::__decay_t>(__t.end()); + } + }; + inline namespace + { + auto end = Trans_NS___end___fn{}; + } + } // namespace ranges + template + struct tuple_size; + template + struct tuple_size> + : integral_constant + { + }; + template + constexpr decltype(sizeof(int)) tuple_size_v = tuple_size<_Tp>::value; + template < + template + class _BaseType, + class _Tp, + _Tp _SequenceSize> + using __make_integer_sequence_impl = + __make_integer_seq<_BaseType, _Tp, _SequenceSize>; + template + struct integer_sequence; + template + using index_sequence = integer_sequence; + template + using make_integer_sequence = + __make_integer_sequence_impl; + template + using make_index_sequence = make_integer_sequence; + template + using index_sequence_for = make_index_sequence; + template + using __make_unsigned_t = __make_unsigned(_Tp); + template + __attribute__(()) __attribute__(()) __attribute__(()) __make_unsigned_t<_Tp> + __to_unsigned_like(_Tp); + template + struct tuple + { + }; + template + __attribute__(()) __attribute__(()) __attribute__(()) tuple<> + forward_as_tuple(_Tp...); + template + struct __perfect_forward_impl; + template + struct __perfect_forward_impl<_Op, index_sequence<_Idx...>, _BoundArgs...> + { + private: + tuple<_BoundArgs...> __bound_args_; + + public: + template < + class... _Args, + class = enable_if_t, _Args...>>> + __attribute__(()) __attribute__(()) __attribute__(()) + __perfect_forward_impl(_Args...); + template < + class... _Args, + class = enable_if_t>> + __attribute__(()) __attribute__(()) __attribute__(()) auto + operator()(_Args &&...__args) const -> decltype(_Op()( + std::get<_Idx>(__bound_args_)..., + std::forward<_Args>(__args)...)); + }; + template + using __perfect_forward = + __perfect_forward_impl<_Op, index_sequence_for<_Args...>, _Args...>; + namespace ranges + { + template + requires is_class_v<_Derived> && same_as<_Derived, remove_cv_t<_Derived>> + class view_interface; + template + requires(!same_as<_Op, view_interface<_Yp>>) + void __is_derived_from_view_interface(view_interface<_Yp> *); + template + constexpr bool enable_view = derived_from<_Tp, int> || requires { + ranges::__is_derived_from_view_interface>( + (remove_cv_t<_Tp> *)nullptr); + }; + template + constexpr bool disable_sized_range = false; + template + concept __size_enabled = disable_sized_range>; + template + concept __member_size = __size_enabled<_Tp> && requires(_Tp __t) { + { static_cast<::std::__decay_t>(__t.size0) } -> __integer_like; + }; + template + concept __unqualified_size = + __size_enabled<_Tp> && __member_size<_Tp> && + __class_or_enum> && requires { + { static_cast<::std::__decay_t>(0) } -> __integer_like; + }; + template + concept __difference = + !__member_size<_Tp> && !__unqualified_size<_Tp> && + __class_or_enum> && requires(_Tp __t) { + { + ranges::end(__t) + } -> sized_sentinel_for()))>; + }; + struct Trans_NS___size___fn + { + template <__difference _Tp> + __attribute__(()) __attribute__(()) __attribute__(()) auto + operator()(_Tp &&__t) const -> decltype(std::__to_unsigned_like( + ranges::end(__t) - ranges::begin(__t))); + }; + inline namespace + { + auto size = Trans_NS___size___fn{}; + } + template + concept range = requires(_Tp &__t) { ranges::end(__t); }; + template + concept input_range = range<_Tp> && input_iterator>; + template + using sentinel_t = decltype(ranges::end(std::declval<_Rp &>())); + template + using range_difference_t = iter_difference_t>; + template + concept sized_range = range<_Tp> && requires { ranges::size; }; + template + concept view = range<_Tp> && movable<_Tp> && enable_view<_Tp>; + template + concept forward_range = input_range<_Tp> && forward_iterator>; + template + concept bidirectional_range = + forward_range<_Tp> && bidirectional_iterator>; + template + concept random_access_range = + bidirectional_range<_Tp> && random_access_iterator>; + template + inline constexpr bool __is_std_initializer_list = false; + template + concept viewable_range = + range<_Tp> && ((view> && + constructible_from, _Tp>) || + (!view> && + (is_lvalue_reference_v<_Tp> || + (movable> && + !__is_std_initializer_list>)))); + template + requires is_class_v<_Derived> && same_as<_Derived, remove_cv_t<_Derived>> + class view_interface + { + }; + template + requires is_class_v<_Tp> && same_as<_Tp, remove_cv_t<_Tp>> + struct __range_adaptor_closure + { + }; + template + struct __pipeable : _Fn, __range_adaptor_closure<__pipeable<_Fn>> + { + }; + template + _Tp __derived_from_range_adaptor_closure(__range_adaptor_closure<_Tp> *); + template + concept _RangeAdaptorClosure = + !ranges::range> && requires { + { + ranges::__derived_from_range_adaptor_closure( + (remove_cvref_t<_Tp> *)nullptr) + } -> same_as>; + }; + template + requires invocable<_Closure, _Range> + __attribute__(()) __attribute__(()) __attribute__(()) constexpr decltype(auto) + operator|(_Range &&__range, _Closure &&__closure) noexcept + { + return std::invoke( + std::forward<_Closure>(__closure), std::forward<_Range>(__range)); + } + } // namespace ranges + template + concept __different_from = !same_as, remove_cvref_t<_Up>>; + namespace ranges + { + template + requires is_object_v<_Range> + struct ref_view : public view_interface> + { + static void __fun(); + + public: + template + requires __different_from<_Tp, ref_view> && + convertible_to<_Tp, _Range &> && requires { __fun; } + __attribute__(()) __attribute__(()) + __attribute__(()) constexpr ref_view(_Tp &&__t); + __attribute__(()) __attribute__(()) + __attribute__(()) constexpr iterator_t<_Range> + begin() const; + __attribute__(()) __attribute__(()) + __attribute__(()) constexpr sentinel_t<_Range> + end() const; + }; + template + ref_view(_Range &) -> ref_view<_Range>; + } // namespace ranges + namespace ranges::views + { + struct __fn : __range_adaptor_closure<__fn> + { + template + requires(!ranges::view>) && + requires(_Tp &&__t) { ranges::ref_view{std::forward<_Tp>(__t)}; } + __attribute__(()) __attribute__(()) __attribute__(()) constexpr auto + operator()(_Tp &&__t) const noexcept + { + return ranges::ref_view{std::forward<_Tp>(__t)}; + }; + }; + inline namespace __cpo + { + inline constexpr auto all = __fn{}; + } + template + using all_t = decltype(views::all(std::declval<_Range>())); + } // namespace ranges::views + struct identity + { + template + __attribute__(()) __attribute__(()) __attribute__(()) constexpr _Tp && + operator()(_Tp &&__t) const noexcept; + }; + template > + struct __bind_back_op; + template + struct __bind_back_op<_NBound, index_sequence<_Ip...>> + { + template + __attribute__(()) __attribute__(()) __attribute__(()) constexpr auto + operator()(_Fn &&__f, _BoundArgs &&__bound_args, _Args &&...__args) const + noexcept -> decltype(std::invoke( + std::forward<_Fn>(__f), + std::forward<_Args>(__args)..., + std::get<_Ip>(std::forward<_BoundArgs>(__bound_args))...)); + }; + template + struct __bind_back_t : __perfect_forward< + __bind_back_op>, + _Fn, + _BoundArgs> + { + using __perfect_forward< + __bind_back_op>, + _Fn, + _BoundArgs>::__perfect_forward; + }; + template + requires is_constructible_v, _Fn> && + is_move_constructible_v> && + (is_constructible_v, _Args> && ...) && + (is_move_constructible_v> && ...) + __attribute__(()) __attribute__(()) + __attribute__(()) constexpr auto __bind_back( + _Fn &&__f, + _Args &&...__args) noexcept + -> decltype(__bind_back_t, tuple...>>( + std::forward<_Fn>(__f), + std::forward_as_tuple(std::forward<_Args>...))); + template + struct __projected_impl + { + struct __type + { + using value_type = remove_cvref_t>; + indirect_result_t<_Proj &, _It> operator*() const; + }; + }; + template < + indirectly_readable _It, + indirectly_regular_unary_invocable<_It> _Proj> + using projected = typename __projected_impl<_It, _Proj>::__type; + namespace ranges + { + struct less + { + template + requires totally_ordered_with<_Tp, _Up> + __attribute__(()) __attribute__(()) __attribute__(()) constexpr bool + operator()(_Tp &&__t, _Up &&__u) const noexcept; + }; + struct __min + { + template < + class _Tp, + class _Proj = identity, + indirect_strict_weak_order> _Comp = + ranges::less> + __attribute__(()) __attribute__(()) __attribute__(()) constexpr const _Tp & + operator()(const _Tp &__a, const _Tp &__b, _Comp __comp = {}) const; + }; + inline namespace __cpo + { + inline constexpr auto min = __min{}; + } + template + struct take_view : public view_interface> + { + _View __base_ = _View(); + range_difference_t<_View> __count_ = 0; + + public: + __attribute__(()) __attribute__(()) + __attribute__(()) constexpr explicit take_view( + _View __base, + range_difference_t<_View> __count); + __attribute__(()) __attribute__(()) __attribute__(()) constexpr auto + begin() const + requires range + { + if constexpr(sized_range) + if constexpr(random_access_range) + return ranges::begin(__base_); + } + __attribute__(()) __attribute__(()) __attribute__(()) constexpr auto + end() const + requires range + { + if constexpr(sized_range) + if constexpr(random_access_range) + return ranges::begin(__base_) + size(); + } + __attribute__(()) __attribute__(()) __attribute__(()) constexpr auto + size() const + requires sized_range + { + auto __n = ranges::size(__base_); + return ranges::min(__n, static_cast(__count_)); + } + }; + template + take_view(_Range &&, range_difference_t<_Range>) + -> take_view>; + namespace views + { + struct Trans_NS___take___fn + { + template < + class _Range, + convertible_to> _Np, + class _RawRange = remove_cvref_t<_Range>> + requires(!0) + __attribute__(()) __attribute__(()) __attribute__(()) constexpr auto + operator()(_Range &&__range, _Np &&__n) const noexcept + -> decltype(take_view( + std::forward<_Range>(__range), + std::forward<_Np>(__n))); + template + requires constructible_from, _Np> + __attribute__(()) __attribute__(()) __attribute__(()) constexpr auto + operator()(_Np &&__n) const noexcept + { + return __pipeable(std::__bind_back(*this, std::forward<_Np>(__n))); + } + }; + inline namespace __cpo + { + inline constexpr auto take = Trans_NS___take___fn{}; + } + } // namespace views + } // namespace ranges + namespace views = ranges::views; + } // namespace +} // namespace std +int main() +{ + int arr[] = {1, 2, 3, 4, 5}; + int sum = 0; + for(auto x : arr | std::views::take(3)) + sum += x; + __CPROVER_assert(sum == 6, "ranges take"); +} diff --git a/regression/cbmc-cpp/cpp20_ranges_basic_libcxx/reduced3.cpp b/regression/cbmc-cpp/cpp20_ranges_basic_libcxx/reduced3.cpp new file mode 100644 index 000000000000..80f28f3d5714 --- /dev/null +++ b/regression/cbmc-cpp/cpp20_ranges_basic_libcxx/reduced3.cpp @@ -0,0 +1,262 @@ +void __CPROVER_assert(bool, char *); +#pragma clang attribute _LibcxxExplicitABIAnnotations.push +namespace std +{ +template +struct integral_constant +{ + static const _Tp value = __v; +}; +template +using _BoolConstant = integral_constant; +template +constexpr bool is_class_v = __is_class(_Tp); +template +_Tp __declval(int); +template +decltype(__declval<_Tp>(0)) declval(); +template +concept convertible_to = requires { _From(); }; +template +using _IsSame = _BoolConstant<__is_same(_Tp, _Up)>; +template +concept __same_as_impl = _IsSame<_Tp, _Up>::value; +template +concept same_as = __same_as_impl<_Up, _Tp>; +struct _IfImpl +{ + template + using _Select = _ElseRes; +}; +template +using _If = _IfImpl::_Select<_IfRes, _ElseRes>; +template +struct conditional +{ + using type = _If<_Bp, int, _ElseRes>; +}; +template +using conditional_t = conditional<_Bp, _ElseRes>::type; +template +using __void_t = void; +template +constexpr bool is_lvalue_reference_v = __is_lvalue_reference(_Tp); +inline namespace +{ +template +concept assignable_from = requires(_Rhs __rhs) { __rhs; }; +template +struct __invoke_result_impl +{ + using type = decltype(__builtin_invoke(declval<_Args>()...)); +}; +template +using __invoke_result = __invoke_result_impl; +template +using __invoke_result_t = __invoke_result<_Args...>::type; +template +using invoke_result_t = __invoke_result_t<_Fn, _Args...>; +template +invoke_result_t<_Fn, _Args...> invoke(_Fn, _Args...); +template +concept invocable = requires(_Fn __fn) { __fn; }; +template +concept __primary_template = requires { typename __void_t<>; }; +template +struct iterator_traits +{ + typedef decltype(static_cast(nullptr) - static_cast(nullptr)) + difference_type; +}; +template +using iter_difference_t = conditional_t< + __primary_template>, + int, + iterator_traits<_Ip>>::difference_type; +template +struct tuple_element; +template +struct tuple +{ +}; +template +struct tuple_element<_Ip, tuple<_Tp...>> +{ + using type = __type_pack_element<_Ip, _Tp...>; +}; +template +tuple_element<_Ip, tuple<_Tp...>>::type get(tuple<_Tp...>); +template +concept __indirectly_readable_impl = requires(_In __i) { __i; }; +template +concept sized_sentinel_for = requires(_Sp __s) { __s; }; +namespace ranges +{ +template +concept __member_begin = requires(_Tp __t) { __t; }; +struct Trans_NS___begin___fn +{ + template + auto operator()(_Tp __t) + { + return __t.begin(); + } +} begin; +} // namespace ranges +template +struct tuple_size; +template +struct tuple_size> + : integral_constant +{ +}; +template +constexpr decltype(sizeof(int)) tuple_size_v = tuple_size<_Tp>::value; +template