assertion failure on attribute((swift_name(""))) (original) (raw)

Reproducer:
https://godbolt.org/z/7TvErnPE6

attribute((swift_name(""))) void foo(int *ret) { *ret = 1; }

Backtrace:

clang++: /root/llvm-project/llvm/include/llvm/ADT/StringRef.h:164: char llvm::StringRef::back() const: Assertion `!empty()' 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++ -g -o /app/output.s -mllvm --x86-asm-syntax=intel -fno-verbose-asm -S --gcc-toolchain=/opt/compiler-explorer/gcc-snapshot -fcolor-diagnostics -fno-crash-diagnostics 1. :1:52: current parser token '{' #0 0x0000000004098828 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4098828) #1 0x0000000004095c54 llvm::sys::CleanupOnSignal(unsigned long) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4095c54) #2 0x0000000003fd9f98 CrashRecoverySignalHandler(int) CrashRecoveryContext.cpp:0:0 #3 0x00007f1120042520 (/lib/x86_64-linux-gnu/libc.so.6+0x42520) #4 0x00007f11200969fc pthread_kill (/lib/x86_64-linux-gnu/libc.so.6+0x969fc) #5 0x00007f1120042476 gsignal (/lib/x86_64-linux-gnu/libc.so.6+0x42476) #6 0x00007f11200287f3 abort (/lib/x86_64-linux-gnu/libc.so.6+0x287f3) #7 0x00007f112002871b (/lib/x86_64-linux-gnu/libc.so.6+0x2871b) #8 0x00007f1120039e96 (/lib/x86_64-linux-gnu/libc.so.6+0x39e96) #9 0x00000000070e37a6 clang::SemaSwift::DiagnoseName(clang::Decl*, llvm::StringRef, clang::SourceLocation, clang::ParsedAttr const&, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x70e37a6) #10 0x00000000070e3ab3 clang::SemaSwift::handleName(clang::Decl*, clang::ParsedAttr const&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x70e3ab3) #11 0x0000000006b59712 ProcessDeclAttribute(clang::Sema&, clang::Scope*, clang::Decl*, clang::ParsedAttr const&, clang::Sema::ProcessDeclAttributeOptions const&) (.isra.0) SemaDeclAttr.cpp:0:0 #12 0x0000000006b5c67b clang::Sema::ProcessDeclAttributes(clang::Scope*, clang::Decl*, clang::Declarator const&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6b5c67b) #13 0x0000000006b103cc clang::Sema::ActOnFunctionDeclarator(clang::Scope*, clang::Declarator&, clang::DeclContext*, clang::TypeSourceInfo*, clang::LookupResult&, llvm::MutableArrayRefclang::TemplateParameterList*, bool&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6b103cc) #14 0x0000000006b16991 clang::Sema::HandleDeclarator(clang::Scope*, clang::Declarator&, llvm::MutableArrayRefclang::TemplateParameterList*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6b16991) #15 0x0000000006b17708 clang::Sema::ActOnStartOfFunctionDef(clang::Scope*, clang::Declarator&, llvm::MutableArrayRefclang::TemplateParameterList*, clang::SkipBodyInfo*, clang::Sema::FnBodyKind) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6b17708) #16 0x0000000006753dd8 clang::Parser::ParseFunctionDefinition(clang::ParsingDeclarator&, clang::Parser::ParsedTemplateInfo const&, clang::Parser::LateParsedAttrList*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6753dd8) #17 0x000000000678a98d 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+++0x678a98d) #18 0x00000000067472fe clang::Parser::ParseDeclOrFunctionDefInternal(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec&, clang::AccessSpecifier) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x67472fe) #19 0x0000000006747a9f clang::Parser::ParseDeclarationOrFunctionDefinition(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec*, clang::AccessSpecifier) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6747a9f) #20 0x000000000674f8da clang::Parser::ParseExternalDeclaration(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x674f8da) #21 0x0000000006750875 clang::Parser::ParseTopLevelDecl(clang::OpaquePtrclang::DeclGroupRef&, clang::Sema::ModuleImportState&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6750875) #22 0x0000000006750d30 clang::Parser::ParseFirstTopLevelDecl(clang::OpaquePtrclang::DeclGroupRef&, clang::Sema::ModuleImportState&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6750d30) #23 0x00000000067307a3 clang::ParseAST(clang::Sema&, bool, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x67307a3) #24 0x00000000049d0e08 clang::CodeGenAction::ExecuteAction() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x49d0e08) #25 0x0000000004cca245 clang::FrontendAction::Execute() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4cca245) #26 0x0000000004c45b8e clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4c45b8e) #27 0x0000000004dbfa81 clang::ExecuteCompilerInvocation(clang::CompilerInstance*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4dbfa81) #28 0x0000000000db2c8f cc1_main(llvm::ArrayRef<char const*>, char const*, void*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xdb2c8f) #29 0x0000000000da993a ExecuteCC1Tool(llvm::SmallVectorImpl<char const*>&, llvm::ToolContext const&) driver.cpp:0:0 #30 0x0000000004a39c49 void llvm::function_ref<void ()>::callback_fn<clang::driver::CC1Command::Execute(llvm::ArrayRef<std::optionalllvm::StringRef>, std::__cxx11::basic_string<char, std::char_traits, std::allocator>, bool) const::'lambda'()>(long) Job.cpp:0:0 #31 0x0000000003fda434 llvm::CrashRecoveryContext::RunSafely(llvm::function_ref<void ()>) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x3fda434) #32 0x0000000004a3a25f clang::driver::CC1Command::Execute(llvm::ArrayRef<std::optionalllvm::StringRef>, std::__cxx11::basic_string<char, std::char_traits, std::allocator>, bool) const (.part.0) Job.cpp:0:0 #33 0x00000000049fad4d clang::driver::Compilation::ExecuteCommand(clang::driver::Command const&, clang::driver::Command const*&, bool) const (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x49fad4d) #34 0x00000000049fbdde 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+++0x49fbdde) #35 0x0000000004a03d75 clang::driver::Driver::ExecuteCompilation(clang::driver::Compilation&, llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*>>&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4a03d75) #36 0x0000000000daf145 clang_main(int, char**, llvm::ToolContext const&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xdaf145) #37 0x0000000000c61ce4 main (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xc61ce4) #38 0x00007f1120029d90 (/lib/x86_64-linux-gnu/libc.so.6+0x29d90) #39 0x00007f1120029e40 __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x29e40) #40 0x0000000000da93e5 _start (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xda93e5) clang++: error: clang frontend command failed with exit code 134 (use -v to see invocation) Compiler returned: 134