Open
Description
The following code triggers this assertion since clang-9:
template <typename T>
struct __attribute__((aligned(unknown<T>()))) S
{
char dummy;
};
S<int> s;Godbolt: https://godbolt.org/z/484sj4M81
The test program is generated by fuzzer.
Stack Dump:
clang++: /root/llvm-project/llvm/tools/clang/lib/Sema/SemaLookup.cpp:2438: bool clang::Sema::LookupQualifiedName(clang::LookupResult&, clang::DeclContext*, bool): Assertion `(!isa<TagDecl>(LookupCtx) || LookupCtx->isDependentContext() || cast<TagDecl>(LookupCtx)->isCompleteDefinition() || cast<TagDecl>(LookupCtx)->isBeingDefined()) && "Declaration context must already be complete!"' 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 -fno-verbose-asm -S --gcc-toolchain=/opt/compiler-explorer/gcc-snapshot -fcolor-diagnostics -fno-crash-diagnostics <source>
1. <source>:6:9: current parser token ';'
2. <source>:2:47: instantiating class definition 'S<int>'
#0 0x0000000003f7a2c8 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x3f7a2c8)
#1 0x0000000003f776f4 llvm::sys::CleanupOnSignal(unsigned long) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x3f776f4)
#2 0x0000000003ebc018 CrashRecoverySignalHandler(int) CrashRecoveryContext.cpp:0:0
#3 0x0000792faac42520 (/lib/x86_64-linux-gnu/libc.so.6+0x42520)
#4 0x0000792faac969fc pthread_kill (/lib/x86_64-linux-gnu/libc.so.6+0x969fc)
#5 0x0000792faac42476 gsignal (/lib/x86_64-linux-gnu/libc.so.6+0x42476)
#6 0x0000792faac287f3 abort (/lib/x86_64-linux-gnu/libc.so.6+0x287f3)
#7 0x0000792faac2871b (/lib/x86_64-linux-gnu/libc.so.6+0x2871b)
#8 0x0000792faac39e96 (/lib/x86_64-linux-gnu/libc.so.6+0x39e96)
#9 0x0000000006cf5546 clang::Sema::LookupQualifiedName(clang::LookupResult&, clang::DeclContext*, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6cf5546)
#10 0x0000000006ef7827 DiagnoseTwoPhaseLookup(clang::Sema&, clang::SourceLocation, clang::CXXScopeSpec const&, clang::LookupResult&, clang::OverloadCandidateSet::CandidateSetKind, clang::TemplateArgumentListInfo*, llvm::ArrayRef<clang::Expr*>, clang::CXXRecordDecl**) SemaOverload.cpp:0:0
#11 0x0000000006f0d9b3 FinishOverloadedCallExpr(clang::Sema&, clang::Scope*, clang::Expr*, clang::UnresolvedLookupExpr*, clang::SourceLocation, llvm::MutableArrayRef<clang::Expr*>, clang::SourceLocation, clang::Expr*, clang::OverloadCandidateSet*, clang::OverloadCandidate**, clang::OverloadingResult, bool) SemaOverload.cpp:0:0
#12 0x0000000006f0e400 clang::Sema::BuildOverloadedCallExpr(clang::Scope*, clang::Expr*, clang::UnresolvedLookupExpr*, clang::SourceLocation, llvm::MutableArrayRef<clang::Expr*>, clang::SourceLocation, clang::Expr*, bool, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6f0e400)
#13 0x0000000006b8a86b clang::Sema::BuildCallExpr(clang::Scope*, clang::Expr*, clang::SourceLocation, llvm::MutableArrayRef<clang::Expr*>, clang::SourceLocation, clang::Expr*, bool, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6b8a86b)
#14 0x0000000006b8ba1e clang::Sema::ActOnCallExpr(clang::Scope*, clang::Expr*, clang::SourceLocation, llvm::MutableArrayRef<clang::Expr*>, clang::SourceLocation, clang::Expr*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6b8ba1e)
#15 0x0000000007184bb0 clang::TreeTransform<(anonymous namespace)::TemplateInstantiator>::TransformCallExpr(clang::CallExpr*) SemaTemplateInstantiate.cpp:0:0
#16 0x0000000007158042 clang::TreeTransform<(anonymous namespace)::TemplateInstantiator>::TransformExpr(clang::Expr*) SemaTemplateInstantiate.cpp:0:0
#17 0x0000000007196602 clang::Sema::SubstExpr(clang::Expr*, clang::MultiLevelTemplateArgumentList const&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x7196602)
#18 0x00000000071a8d42 instantiateDependentAlignedAttr(clang::Sema&, clang::MultiLevelTemplateArgumentList const&, clang::AlignedAttr const*, clang::Decl*, bool) SemaTemplateInstantiateDecl.cpp:0:0
#19 0x0000000007208a1c clang::Sema::InstantiateAttrs(clang::MultiLevelTemplateArgumentList const&, clang::Decl const*, clang::Decl*, llvm::SmallVector<clang::Sema::LateInstantiatedAttribute, 1u>*, clang::LocalInstantiationScope*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x7208a1c)
#20 0x000000000716e525 clang::Sema::InstantiateClass(clang::SourceLocation, clang::CXXRecordDecl*, clang::CXXRecordDecl*, clang::MultiLevelTemplateArgumentList const&, clang::TemplateSpecializationKind, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x716e525)
#21 0x00000000071a5e4b clang::Sema::InstantiateClassTemplateSpecialization(clang::SourceLocation, clang::ClassTemplateSpecializationDecl*, clang::TemplateSpecializationKind, bool, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x71a5e4b)
#22 0x0000000007224c4e void llvm::function_ref<void ()>::callback_fn<clang::Sema::RequireCompleteTypeImpl(clang::SourceLocation, clang::QualType, clang::Sema::CompleteTypeKind, clang::Sema::TypeDiagnoser*)::'lambda'()>(long) SemaType.cpp:0:0
#23 0x0000000007eb71b1 clang::StackExhaustionHandler::runWithSufficientStackSpace(clang::SourceLocation, llvm::function_ref<void ()>) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x7eb71b1)
#24 0x000000000722d7ba clang::Sema::RequireCompleteTypeImpl(clang::SourceLocation, clang::QualType, clang::Sema::CompleteTypeKind, clang::Sema::TypeDiagnoser*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x722d7ba)
#25 0x000000000722ddb5 clang::Sema::RequireCompleteType(clang::SourceLocation, clang::QualType, clang::Sema::CompleteTypeKind, clang::Sema::TypeDiagnoser&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x722ddb5)
#26 0x000000000722df35 clang::Sema::RequireCompleteType(clang::SourceLocation, clang::QualType, clang::Sema::CompleteTypeKind, unsigned int) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x722df35)
#27 0x00000000069f070a clang::Sema::ActOnUninitializedDecl(clang::Decl*) (.part.0) SemaDecl.cpp:0:0
#28 0x000000000665c13e clang::Parser::ParseDeclarationAfterDeclaratorAndAttributes(clang::Declarator&, clang::Parser::ParsedTemplateInfo const&, clang::Parser::ForRangeInit*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x665c13e)
#29 0x000000000666b4d9 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+++0x666b4d9)
#30 0x0000000006628cae clang::Parser::ParseDeclOrFunctionDefInternal(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec&, clang::AccessSpecifier) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6628cae)
#31 0x0000000006629459 clang::Parser::ParseDeclarationOrFunctionDefinition(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec*, clang::AccessSpecifier) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6629459)
#32 0x00000000066310da clang::Parser::ParseExternalDeclaration(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x66310da)
#33 0x000000000663208d clang::Parser::ParseTopLevelDecl(clang::OpaquePtr<clang::DeclGroupRef>&, clang::Sema::ModuleImportState&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x663208d)
#34 0x0000000006623e2a clang::ParseAST(clang::Sema&, bool, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6623e2a)
#35 0x000000000492dcd8 clang::CodeGenAction::ExecuteAction() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x492dcd8)
#36 0x0000000004c27125 clang::FrontendAction::Execute() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4c27125)
#37 0x0000000004ba408e clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4ba408e)
#38 0x0000000004d18961 clang::ExecuteCompilerInvocation(clang::CompilerInstance*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4d18961)
#39 0x0000000000d90b1f cc1_main(llvm::ArrayRef<char const*>, char const*, void*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xd90b1f)
#40 0x0000000000d876fa ExecuteCC1Tool(llvm::SmallVectorImpl<char const*>&, llvm::ToolContext const&) driver.cpp:0:0
#41 0x0000000004994889 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
#42 0x0000000003ebc4b4 llvm::CrashRecoveryContext::RunSafely(llvm::function_ref<void ()>) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x3ebc4b4)
#43 0x0000000004994e9f 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
#44 0x0000000004956e6d clang::driver::Compilation::ExecuteCommand(clang::driver::Command const&, clang::driver::Command const*&, bool) const (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4956e6d)
#45 0x0000000004957efe 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+++0x4957efe)
#46 0x0000000004960a95 clang::driver::Driver::ExecuteCompilation(clang::driver::Compilation&, llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*>>&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4960a95)
#47 0x0000000000d8cfcf clang_main(int, char**, llvm::ToolContext const&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xd8cfcf)
#48 0x0000000000c42484 main (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xc42484)
#49 0x0000792faac29d90 (/lib/x86_64-linux-gnu/libc.so.6+0x29d90)
#50 0x0000792faac29e40 __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x29e40)
#51 0x0000000000d871a5 _start (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xd871a5)
clang++: error: clang frontend command failed with exit code 134 (use -v to see invocation)