Closed
Description
Compiler explorer: https://godbolt.org/z/6d1nE6x56.
The following program small.c triggers a crash in clang-18:
% cat small.c
int main () {
int v; const int x;
#pragma omp atomic capture
{ v = x; x = 1; }
return 0;
}
% clang -O0 -fopenmp-simd small.c
<source>:4:16: error: cannot assign to variable 'x' with const-qualified type 'const int'
4 | { v = x; x = 1; }
| ~ ^
<source>:2:20: note: variable 'x' declared const here
2 | int v; const int x;
| ~~~~~~~~~~^
clang: /root/llvm-project/llvm/include/llvm/Support/Casting.h:662: decltype(auto) llvm::dyn_cast(From*) [with To = clang::BinaryOperator; From = const clang::Stmt]: Assertion `detail::isPresent(Val) && "dyn_cast on a non-existent value"' failed.
PLEASE submit a bug report to https://github.com/llvm/llvm-project/issues/ and include the crash backtrace, preprocessed source, and associated run script.
Stack dump:
0. Program arguments: /opt/compiler-explorer/clang-assertions-trunk/bin/clang -gdwarf-4 -g -o /app/output.s -mllvm --x86-asm-syntax=intel -S --gcc-toolchain=/opt/compiler-explorer/gcc-9.2.0 -fcolor-diagnostics -fno-crash-diagnostics -O0 -fopenmp-simd <source>
1. <source>:5:3: current parser token 'return'
2. <source>:1:13: parsing function body 'main'
3. <source>:1:13: in compound statement ('{}')
#0 0x000000000372dd18 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x372dd18)
#1 0x000000000372b9dc llvm::sys::CleanupOnSignal(unsigned long) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x372b9dc)
#2 0x00000000036742f8 CrashRecoverySignalHandler(int) CrashRecoveryContext.cpp:0:0
#3 0x00007f6d801d8420 __restore_rt (/lib/x86_64-linux-gnu/libpthread.so.0+0x14420)
#4 0x00007f6d7fc9b00b raise (/lib/x86_64-linux-gnu/libc.so.6+0x4300b)
#5 0x00007f6d7fc7a859 abort (/lib/x86_64-linux-gnu/libc.so.6+0x22859)
#6 0x00007f6d7fc7a729 (/lib/x86_64-linux-gnu/libc.so.6+0x22729)
#7 0x00007f6d7fc8bfd6 (/lib/x86_64-linux-gnu/libc.so.6+0x33fd6)
#8 0x000000000724fa90 clang::StmtVisitorBase<llvm::make_const_ptr, (anonymous namespace)::StmtProfiler, void>::Visit(clang::Stmt const*) StmtProfile.cpp:0:0
#9 0x0000000007256880 clang::Stmt::Profile(llvm::FoldingSetNodeID&, clang::ASTContext const&, bool, bool) const (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x7256880)
#10 0x00000000066aaa34 clang::Sema::ActOnOpenMPAtomicDirective(llvm::ArrayRef<clang::OMPClause*>, clang::Stmt*, clang::SourceLocation, clang::SourceLocation) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x66aaa34)
#11 0x000000000672c999 clang::Sema::ActOnOpenMPExecutableDirective(llvm::omp::Directive, clang::DeclarationNameInfo const&, llvm::omp::Directive, llvm::ArrayRef<clang::OMPClause*>, clang::Stmt*, clang::SourceLocation, clang::SourceLocation, llvm::omp::Directive) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x672c999)
#12 0x0000000005f5ccd4 clang::Parser::ParseOpenMPDeclarativeOrExecutableDirective(clang::Parser::ParsedStmtContext, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x5f5ccd4)
#13 0x0000000005f792e4 clang::Parser::ParseStatementOrDeclarationAfterAttributes(llvm::SmallVector<clang::Stmt*, 32u>&, clang::Parser::ParsedStmtContext, clang::SourceLocation*, clang::ParsedAttributes&, clang::ParsedAttributes&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x5f792e4)
#14 0x0000000005f7b188 clang::Parser::ParseStatementOrDeclaration(llvm::SmallVector<clang::Stmt*, 32u>&, clang::Parser::ParsedStmtContext, clang::SourceLocation*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x5f7b188)
#15 0x0000000005f7c0c9 clang::Parser::ParseCompoundStatementBody(bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x5f7c0c9)
#16 0x0000000005f7d9ea clang::Parser::ParseFunctionStatementBody(clang::Decl*, clang::Parser::ParseScope&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x5f7d9ea)
#17 0x0000000005eab6d1 clang::Parser::ParseFunctionDefinition(clang::ParsingDeclarator&, clang::Parser::ParsedTemplateInfo const&, clang::Parser::LateParsedAttrList*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x5eab6d1)
#18 0x0000000005ed2bd8 clang::Parser::ParseDeclGroup(clang::ParsingDeclSpec&, clang::DeclaratorContext, clang::ParsedAttributes&, clang::SourceLocation*, clang::Parser::ForRangeInit*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x5ed2bd8)
#19 0x0000000005e9fb3b clang::Parser::ParseDeclOrFunctionDefInternal(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec&, clang::AccessSpecifier) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x5e9fb3b)
#20 0x0000000005ea026f clang::Parser::ParseDeclarationOrFunctionDefinition(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec*, clang::AccessSpecifier) (.part.0) Parser.cpp:0:0
#21 0x0000000005ea7c14 clang::Parser::ParseExternalDeclaration(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x5ea7c14)
#22 0x0000000005ea843d clang::Parser::ParseTopLevelDecl(clang::OpaquePtr<clang::DeclGroupRef>&, clang::Sema::ModuleImportState&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x5ea843d)
#23 0x0000000005ea8880 clang::Parser::ParseFirstTopLevelDecl(clang::OpaquePtr<clang::DeclGroupRef>&, clang::Sema::ModuleImportState&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x5ea8880)
#24 0x0000000005e9b4b2 clang::ParseAST(clang::Sema&, bool, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x5e9b4b2)
#25 0x00000000049982a8 clang::CodeGenAction::ExecuteAction() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x49982a8)
#26 0x00000000041fc4f9 clang::FrontendAction::Execute() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x41fc4f9)
#27 0x000000000417d9ce clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x417d9ce)
#28 0x00000000042db54e clang::ExecuteCompilerInvocation(clang::CompilerInstance*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x42db54e)
#29 0x0000000000bef0e6 cc1_main(llvm::ArrayRef<char const*>, char const*, void*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0xbef0e6)
#30 0x0000000000be69aa ExecuteCC1Tool(llvm::SmallVectorImpl<char const*>&, llvm::ToolContext const&) driver.cpp:0:0
#31 0x0000000003fd9c19 void llvm::function_ref<void ()>::callback_fn<clang::driver::CC1Command::Execute(llvm::ArrayRef<std::optional<llvm::StringRef>>, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char>>*, bool*) const::'lambda'()>(long) Job.cpp:0:0
#32 0x00000000036747a4 llvm::CrashRecoveryContext::RunSafely(llvm::function_ref<void ()>) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x36747a4)
#33 0x0000000003fda20f clang::driver::CC1Command::Execute(llvm::ArrayRef<std::optional<llvm::StringRef>>, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char>>*, bool*) const (.part.0) Job.cpp:0:0
#34 0x0000000003fa23d5 clang::driver::Compilation::ExecuteCommand(clang::driver::Command const&, clang::driver::Command const*&, bool) const (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x3fa23d5)
#35 0x0000000003fa2e3d clang::driver::Compilation::ExecuteJobs(clang::driver::JobList const&, llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*>>&, bool) const (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x3fa2e3d)
#36 0x0000000003faad65 clang::driver::Driver::ExecuteCompilation(clang::driver::Compilation&, llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*>>&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x3faad65)
#37 0x0000000000bec58c clang_main(int, char**, llvm::ToolContext const&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0xbec58c)
#38 0x0000000000ae6751 main (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0xae6751)
#39 0x00007f6d7fc7c083 __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x24083)
#40 0x0000000000be648e _start (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0xbe648e)
clang: error: clang frontend command failed with exit code 134 (use -v to see invocation)Clang version:
clang version 18.0.0 (https://github.com/llvm/llvm-project.git f2b79ed9c6c858426b15a0374103ab901b5b2ef3)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /opt/compiler-explorer/clang-assertions-trunk/bin