| Issue |
175561
|
| Summary |
[Clang] Crash in `BuildUsingDeclaration` with using-declaration of conversion operator to dependent nested type
|
| Labels |
clang
|
| Assignees |
|
| Reporter |
Attacker23
|
A very old bug: it originates in Clang 3.0.0 (assertions build) and is still reproducible on trunk, while GCC/EDG and MSVC correctly reject the code instead of crashing.
### Minimal Reproduction
```cpp
template <class T>
struct A {
struct N {};
operator A<int>::N*();
};
template <class T>
struct B : A<T> {
using A<T>::operator typename A<T>::N*;
};
B<int> x;
```
Clang crashes when a class template uses a `using` declaration to import a conversion operator from a dependent base class, where the conversion target type involves a nested type from another specialization.
The crash occurs in `Sema::BuildUsingDeclaration` with assertion `IdentLoc.isValid() && "Invalid TargetName location."` — it appears the `DeclarationNameInfo` for the conversion-function-id is not properly populated when the target type is dependent.
### Compiler Explorer
**https://godbolt.org/z/jhW9f6zKo**
### Compiler Output
```
<source>:4:12: error: implicit instantiation of template 'A<int>' within its own definition
4 | operator A<int>::N*();
| ^
clang++: /root/llvm-project/llvm/tools/clang/lib/Sema/SemaDeclCXX.cpp:13112: clang::NamedDecl* clang::Sema::BuildUsingDeclaration(clang::Scope*, clang::AccessSpecifier, clang::SourceLocation, bool, clang::SourceLocation, clang::CXXScopeSpec&, clang::DeclarationNameInfo, clang::SourceLocation, const clang::ParsedAttributesView&, bool, bool): Assertion `IdentLoc.isValid() && "Invalid TargetName location."' 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 -ferror-limit=0 <source>
1. <source>:12:9: current parser token ';'
2. <source>:8:8: instantiating class definition 'B<int>'
#0 0x000000000430abe8 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x430abe8)
#1 0x0000000004308014 llvm::sys::CleanupOnSignal(unsigned long) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4308014)
#2 0x000000000424aa08 CrashRecoverySignalHandler(int) CrashRecoveryContext.cpp:0:0
#3 0x0000763db0242520 (/lib/x86_64-linux-gnu/libc.so.6+0x42520)
#4 0x0000763db02969fc pthread_kill (/lib/x86_64-linux-gnu/libc.so.6+0x969fc)
#5 0x0000763db0242476 gsignal (/lib/x86_64-linux-gnu/libc.so.6+0x42476)
#6 0x0000763db02287f3 abort (/lib/x86_64-linux-gnu/libc.so.6+0x287f3)
#7 0x0000763db022871b (/lib/x86_64-linux-gnu/libc.so.6+0x2871b)
#8 0x0000763db0239e96 (/lib/x86_64-linux-gnu/libc.so.6+0x39e96)
#9 0x0000000006ecf186 clang::Sema::BuildUsingDeclaration(clang::Scope*, clang::AccessSpecifier, clang::SourceLocation, bool, clang::SourceLocation, clang::CXXScopeSpec&, clang::DeclarationNameInfo, clang::SourceLocation, clang::ParsedAttributesView const&, bool, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6ecf186)
#10 0x0000000007680cbf clang::Decl* clang::TemplateDeclInstantiator::instantiateUnresolvedUsingDecl<clang::UnresolvedUsingValueDecl>(clang::UnresolvedUsingValueDecl*, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x7680cbf)
#11 0x00000000075ad0cb clang::Sema::InstantiateClassImpl(clang::SourceLocation, clang::CXXRecordDecl*, clang::CXXRecordDecl*, clang::MultiLevelTemplateArgumentList const&, clang::TemplateSpecializationKind, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x75ad0cb)
#12 0x0000000007618fbe clang::Sema::InstantiateClassTemplateSpecialization(clang::SourceLocation, clang::ClassTemplateSpecializationDecl*, clang::TemplateSpecializationKind, bool, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x7618fbe)
#13 0x000000000769a20e 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
#14 0x0000000008539031 clang::StackExhaustionHandler::runWithSufficientStackSpace(clang::SourceLocation, llvm::function_ref<void ()>) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x8539031)
#15 0x00000000076a5a33 clang::Sema::RequireCompleteTypeImpl(clang::SourceLocation, clang::QualType, clang::Sema::CompleteTypeKind, clang::Sema::TypeDiagnoser*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x76a5a33)
#16 0x00000000076a5ecf clang::Sema::RequireCompleteType(clang::SourceLocation, clang::QualType, clang::Sema::CompleteTypeKind, clang::Sema::TypeDiagnoser&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x76a5ecf)
#17 0x00000000076a6535 clang::Sema::RequireCompleteType(clang::SourceLocation, clang::QualType, clang::Sema::CompleteTypeKind, unsigned int) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x76a6535)
#18 0x0000000006e361f3 clang::Sema::ActOnUninitializedDecl(clang::Decl*) (.part.0) SemaDecl.cpp:0:0
#19 0x0000000006a8a12b clang::Parser::ParseDeclarationAfterDeclaratorAndAttributes(clang::Declarator&, clang::Parser::ParsedTemplateInfo const&, clang::Parser::ForRangeInit*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6a8a12b)
#20 0x0000000006a97e5a 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+++0x6a97e5a)
#21 0x0000000006a5555b clang::Parser::ParseDeclOrFunctionDefInternal(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec&, clang::AccessSpecifier) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6a5555b)
#22 0x0000000006a55d4f clang::Parser::ParseDeclarationOrFunctionDefinition(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec*, clang::AccessSpecifier) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6a55d4f)
#23 0x0000000006a5db7a clang::Parser::ParseExternalDeclaration(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6a5db7a)
#24 0x0000000006a5eb15 clang::Parser::ParseTopLevelDecl(clang::OpaquePtr<clang::DeclGroupRef>&, clang::Sema::ModuleImportState&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6a5eb15)
#25 0x0000000006a3fb9a clang::ParseAST(clang::Sema&, bool, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6a3fb9a)
#26 0x0000000004c6daf8 clang::CodeGenAction::ExecuteAction() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4c6daf8)
#27 0x0000000004f66ee5 clang::FrontendAction::Execute() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4f66ee5)
#28 0x0000000004ee6d1e clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4ee6d1e)
#29 0x000000000506158d clang::ExecuteCompilerInvocation(clang::CompilerInstance*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x506158d)
#30 0x0000000000de8a9e cc1_main(llvm::ArrayRef<char const*>, char const*, void*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xde8a9e)
#31 0x0000000000ddf46a ExecuteCC1Tool(llvm::SmallVectorImpl<char const*>&, llvm::ToolContext const&, llvm::IntrusiveRefCntPtr<llvm::vfs::FileSystem>) driver.cpp:0:0
#32 0x0000000000ddf5ed int llvm::function_ref<int (llvm::SmallVectorImpl<char const*>&)>::callback_fn<clang_main(int, char**, llvm::ToolContext const&)::'lambda'(llvm::SmallVectorImpl<char const*>&)>(long, llvm::SmallVectorImpl<char const*>&) driver.cpp:0:0
#33 0x0000000004ce0b39 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
#34 0x000000000424aea4 llvm::CrashRecoveryContext::RunSafely(llvm::function_ref<void ()>) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x424aea4)
#35 0x0000000004ce114f 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
#36 0x0000000004ca1ae2 clang::driver::Compilation::ExecuteCommand(clang::driver::Command const&, clang::driver::Command const*&, bool) const (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4ca1ae2)
#37 0x0000000004ca2a8e 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+++0x4ca2a8e)
#38 0x0000000004ca9ee5 clang::driver::Driver::ExecuteCompilation(clang::driver::Compilation&, llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*>>&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4ca9ee5)
#39 0x0000000000de4e11 clang_main(int, char**, llvm::ToolContext const&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xde4e11)
#40 0x0000000000c8f104 main (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xc8f104)
#41 0x0000763db0229d90 (/lib/x86_64-linux-gnu/libc.so.6+0x29d90)
#42 0x0000763db0229e40 __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x29e40)
#43 0x0000000000ddef05 _start (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xddef05)
clang++: error: clang frontend command failed with exit code 134 (use -v to see invocation)
Compiler returned: 134
```
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