using enum declaration with anonymous enum crashes clang frontend #86790
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clang:frontend
Language frontend issues, e.g. anything involving "Sema"
confirmed
Verified by a second party
crash
Prefer [crash-on-valid] or [crash-on-invalid]
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@llvm/issue-subscribers-clang-frontend Author: None (svetli97)
Minimal example:
```
enum {A, S, D, F}; // the enum is in an outer scope to avoid name collisions. This seems unrelated to the bug.
// enum Asdf {A, S, D, F}; // naming the enum prevents the crash
int main()
{
using asdf = decltype(A);
using enum asdf; // this line causes the crash
return 0;
}
```
Needs additional clang command line argument "-std=c++20" (or later) to support using-enum-declarations.
The gcc compiler compiles this code without any problems.
Downloaded compilers from https://winlibs.com/
exact file download link: https://github.com/brechtsanders/winlibs_mingw/releases/download/13.1.0-16.0.5-11.0.0-ucrt-r5/winlibs-x86_64-posix-seh-gcc-13.1.0-llvm-16.0.5-mingw-w64ucrt-11.0.0-r5.zip
OS: Windows
Expected behavior: the code should compile. Observed behavior: clang frontend crashes with the following error message: The files mentioned in the error message: C:/Users/SVETLI~1.TOT/AppData/Local/Temp/test-0047ff.sh: |
|
Confirmed: https://godbolt.org/z/xjb96Edxr Assertion clang++: /root/llvm-project/clang/include/clang/AST/DeclarationName.h:503:
void* clang::DeclarationName::getFETokenInfo() const:
Assertion `getPtr() && "getFETokenInfo on an empty DeclarationName!"' failed.Backtrace: 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-snapshot -fcolor-diagnostics -fno-crash-diagnostics -std=c++20 <source>
1. <source>:6:20: current parser token ';'
2. <source>:4:1: parsing function body 'main'
3. <source>:4:1: in compound statement ('{}')
#0 0x0000000003920cd8 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x3920cd8)
#1 0x000000000391e9bc llvm::sys::CleanupOnSignal(unsigned long) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x391e9bc)
#2 0x0000000003865258 CrashRecoverySignalHandler(int) CrashRecoveryContext.cpp:0:0
#3 0x00007f938b842520 (/lib/x86_64-linux-gnu/libc.so.6+0x42520)
#4 0x00007f938b8969fc pthread_kill (/lib/x86_64-linux-gnu/libc.so.6+0x969fc)
#5 0x00007f938b842476 gsignal (/lib/x86_64-linux-gnu/libc.so.6+0x42476)
#6 0x00007f938b8287f3 abort (/lib/x86_64-linux-gnu/libc.so.6+0x287f3)
#7 0x00007f938b82871b (/lib/x86_64-linux-gnu/libc.so.6+0x2871b)
#8 0x00007f938b839e96 (/lib/x86_64-linux-gnu/libc.so.6+0x39e96)
#9 0x00000000062f2087 clang::IdentifierResolver::begin(clang::DeclarationName) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x62f2087)
#10 0x00000000064fd446 clang::Sema::PushOnScopeChains(clang::NamedDecl*, clang::Scope*, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x64fd446)
#11 0x00000000065fef54 clang::Sema::ActOnUsingEnumDeclaration(clang::Scope*, clang::AccessSpecifier, clang::SourceLocation, clang::SourceLocation, clang::SourceLocation, clang::IdentifierInfo&, clang::CXXScopeSpec*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x65fef54)
#12 0x00000000062224ef clang::Parser::ParseUsingDeclaration(clang::DeclaratorContext, clang::Parser::ParsedTemplateInfo const&, clang::SourceLocation, clang::SourceLocation&, clang::ParsedAttributes&, clang::AccessSpecifier) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x62224ef)
#13 0x00000000062228a5 clang::Parser::ParseUsingDirectiveOrDeclaration(clang::DeclaratorContext, clang::Parser::ParsedTemplateInfo const&, clang::SourceLocation&, clang::ParsedAttributes&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x62228a5)
#14 0x00000000062094ea clang::Parser::ParseDeclaration(clang::DeclaratorContext, clang::SourceLocation&, clang::ParsedAttributes&, clang::ParsedAttributes&, clang::SourceLocation*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x62094ea)
#15 0x00000000062aaf8c 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+++0x62aaf8c)
#16 0x00000000062ac247 clang::Parser::ParseStatementOrDeclaration(llvm::SmallVector<clang::Stmt*, 32u>&, clang::Parser::ParsedStmtContext, clang::SourceLocation*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x62ac247)
#17 0x00000000062ad151 clang::Parser::ParseCompoundStatementBody(bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x62ad151)
#18 0x00000000062aea6a clang::Parser::ParseFunctionStatementBody(clang::Decl*, clang::Parser::ParseScope&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x62aea6a)
#19 0x00000000061c9b41 clang::Parser::ParseFunctionDefinition(clang::ParsingDeclarator&, clang::Parser::ParsedTemplateInfo const&, clang::Parser::LateParsedAttrList*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x61c9b41)
#20 0x00000000062011bc clang::Parser::ParseDeclGroup(clang::ParsingDeclSpec&, clang::DeclaratorContext, clang::ParsedAttributes&, clang::Parser::ParsedTemplateInfo&, clang::SourceLocation*, clang::Parser::ForRangeInit*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x62011bc)
#21 0x00000000061bdade clang::Parser::ParseDeclOrFunctionDefInternal(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec&, clang::AccessSpecifier) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x61bdade)
#22 0x00000000061be2d3 clang::Parser::ParseDeclarationOrFunctionDefinition(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec*, clang::AccessSpecifier) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x61be2d3)
#23 0x00000000061c5746 clang::Parser::ParseExternalDeclaration(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x61c5746)
#24 0x00000000061c65ed clang::Parser::ParseTopLevelDecl(clang::OpaquePtr<clang::DeclGroupRef>&, clang::Sema::ModuleImportState&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x61c65ed)
#25 0x00000000061b92ca clang::ParseAST(clang::Sema&, bool, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x61b92ca)
#26 0x00000000041bd968 clang::CodeGenAction::ExecuteAction() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x41bd968)
#27 0x000000000443cfe9 clang::FrontendAction::Execute() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x443cfe9)
#28 0x00000000043c66de clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x43c66de)
#29 0x000000000452009e clang::ExecuteCompilerInvocation(clang::CompilerInstance*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x452009e)
#30 0x0000000000c29b5c cc1_main(llvm::ArrayRef<char const*>, char const*, void*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xc29b5c)
#31 0x0000000000c22dea ExecuteCC1Tool(llvm::SmallVectorImpl<char const*>&, llvm::ToolContext const&) driver.cpp:0:0
#32 0x00000000042008e9 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
#33 0x0000000003865704 llvm::CrashRecoveryContext::RunSafely(llvm::function_ref<void ()>) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x3865704)
#34 0x0000000004200edf 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
#35 0x00000000041c7275 clang::driver::Compilation::ExecuteCommand(clang::driver::Command const&, clang::driver::Command const*&, bool) const (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x41c7275)
#36 0x00000000041c7cdd 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+++0x41c7cdd)
#37 0x00000000041cfa45 clang::driver::Driver::ExecuteCompilation(clang::driver::Compilation&, llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*>>&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x41cfa45)
#38 0x0000000000c26ff5 clang_main(int, char**, llvm::ToolContext const&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xc26ff5)
#39 0x0000000000b1d474 main (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xb1d474)
#40 0x00007f938b829d90 (/lib/x86_64-linux-gnu/libc.so.6+0x29d90)
#41 0x00007f938b829e40 __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x29e40)
#42 0x0000000000c228de _start (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xc228de)
clang++: error: clang frontend command failed with exit code 134 (use -v to see invocation)
Compiler returned: 134 |
jcsxky
added a commit
that referenced
this issue
Apr 5, 2024
…87144) Try to fix #86790 `getFETokenInfo` requires `DeclarationName` shouldn't be empty and this will produce crash when checking name conflict of an anonymous `NamedDecl` in `Sema::PushOnScopeChains` and whether it's a reserved identifier or not. These wouldn't happen when it's a anonymous enum and we can skip the checking and just add the declaration to current scope. Co-authored-by: huqizhi <836744285@qq.com>
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Minimal example:
Needs additional clang command line argument "-std=c++20" (or later) to support using-enum-declarations.
The gcc compiler compiles this code without any problems.
Downloaded compilers from https://winlibs.com/
exact file download link: https://github.com/brechtsanders/winlibs_mingw/releases/download/13.1.0-16.0.5-11.0.0-ucrt-r5/winlibs-x86_64-posix-seh-gcc-13.1.0-llvm-16.0.5-mingw-w64ucrt-11.0.0-r5.zip
OS: Windows
Expected behavior: the code should compile.
Observed behavior: clang frontend crashes with the following error message:
The files mentioned in the error message:
C:/Users/SVETLI~1.TOT/AppData/Local/Temp/test-0047ff.cpp:
C:/Users/SVETLI~1.TOT/AppData/Local/Temp/test-0047ff.sh:
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