| Issue |
173477
|
| Summary |
[Clang][CodeGen] Assertion failure in QualType::getCommonPtr inside X86_64ABIInfo::classify when using visibility attribute with forward-declared enum
|
| Labels |
clang:codegen,
crash-on-invalid
|
| Assignees |
|
| Reporter |
AbyssStaror
|
### Link for quick verification: https://godbolt.org/z/xb7jznz3K
```c
__attribute__((visibility ("default"))) void func(enum E e);
enum E { A, B, C, D };
__attribute__((visibility ("default"))) void func(enum E e) {}
```
Go back to `clang 21.1.0 (assertions)` .
This issue is specifically reproducible when using `-std=c2x`. This is significant because C23 officially introduced support for forward declarations of enumerations.
## Stack dump
```console
clang++: /root/llvm-project/llvm/tools/clang/include/clang/AST/TypeBase.h:953: const clang::ExtQualsTypeCommonBase* clang::QualType::getCommonPtr() const: Assertion `!isNull() && "Cannot retrieve a NULL type pointer"' 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 -x c -std=c2x <source>
1. <eof> parser at end of file
2. <source>:8:46: LLVM IR generation of declaration 'func'
3. <source>:8:46: Generating code for declaration 'func'
#0 0x00000000042ebc28 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x42ebc28)
#1 0x00000000042e9054 llvm::sys::CleanupOnSignal(unsigned long) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x42e9054)
#2 0x000000000422de38 CrashRecoverySignalHandler(int) CrashRecoveryContext.cpp:0:0
#3 0x000077ea3b442520 (/lib/x86_64-linux-gnu/libc.so.6+0x42520)
#4 0x000077ea3b4969fc pthread_kill (/lib/x86_64-linux-gnu/libc.so.6+0x969fc)
#5 0x000077ea3b442476 gsignal (/lib/x86_64-linux-gnu/libc.so.6+0x42476)
#6 0x000077ea3b4287f3 abort (/lib/x86_64-linux-gnu/libc.so.6+0x287f3)
#7 0x000077ea3b42871b (/lib/x86_64-linux-gnu/libc.so.6+0x2871b)
#8 0x000077ea3b439e96 (/lib/x86_64-linux-gnu/libc.so.6+0x39e96)
#9 0x0000000004abc6d9 (anonymous namespace)::X86_64ABIInfo::classify(clang::QualType, unsigned long, (anonymous namespace)::X86_64ABIInfo::Class&, (anonymous namespace)::X86_64ABIInfo::Class&, bool, bool) const X86.cpp:0:0
#10 0x0000000004abbd5d (anonymous namespace)::X86_64ABIInfo::classify(clang::QualType, unsigned long, (anonymous namespace)::X86_64ABIInfo::Class&, (anonymous namespace)::X86_64ABIInfo::Class&, bool, bool) const X86.cpp:0:0
#11 0x0000000004abd842 (anonymous namespace)::X86_64ABIInfo::classifyArgumentType(clang::QualType, unsigned int, unsigned int&, unsigned int&, bool, bool) const X86.cpp:0:0
#12 0x0000000004abe3d4 (anonymous namespace)::X86_64ABIInfo::computeInfo(clang::CodeGen::CGFunctionInfo&) const X86.cpp:0:0
#13 0x0000000004b44089 clang::CodeGen::CodeGenTypes::arrangeLLVMFunctionInfo(clang::CanQual<clang::Type>, clang::CodeGen::FnInfoOpts, llvm::ArrayRef<clang::CanQual<clang::Type>>, clang::FunctionType::ExtInfo, llvm::ArrayRef<clang::FunctionType::ExtParameterInfo>, clang::CodeGen::RequiredArgs) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4b44089)
#14 0x0000000004b4597e arrangeLLVMFunctionInfo(clang::CodeGen::CodeGenTypes&, bool, llvm::SmallVectorImpl<clang::CanQual<clang::Type>>&, clang::CanQual<clang::FunctionProtoType>) CGCall.cpp:0:0
#15 0x0000000004b4970e clang::CodeGen::CodeGenTypes::arrangeFunctionDeclaration(clang::GlobalDecl) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4b4970e)
#16 0x00000000048e5856 clang::CodeGen::CodeGenModule::EmitGlobalFunctionDefinition(clang::GlobalDecl, llvm::GlobalValue*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x48e5856)
#17 0x00000000048e0624 clang::CodeGen::CodeGenModule::EmitGlobalDefinition(clang::GlobalDecl, llvm::GlobalValue*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x48e0624)
#18 0x00000000048e0e03 clang::CodeGen::CodeGenModule::EmitGlobal(clang::GlobalDecl) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x48e0e03)
#19 0x00000000048ec393 clang::CodeGen::CodeGenModule::EmitTopLevelDecl(clang::Decl*) (.part.0) CodeGenModule.cpp:0:0
#20 0x0000000004c4fba9 (anonymous namespace)::CodeGeneratorImpl::HandleTopLevelDecl(clang::DeclGroupRef) ModuleBuilder.cpp:0:0
#21 0x0000000004c406d4 clang::BackendConsumer::HandleTopLevelDecl(clang::DeclGroupRef) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4c406d4)
#22 0x0000000006a06f74 clang::ParseAST(clang::Sema&, bool, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6a06f74)
#23 0x0000000004c4cfb8 clang::CodeGenAction::ExecuteAction() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4c4cfb8)
#24 0x0000000004f438b5 clang::FrontendAction::Execute() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4f438b5)
#25 0x0000000004ec3b4e clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4ec3b4e)
#26 0x000000000503dc3d clang::ExecuteCompilerInvocation(clang::CompilerInstance*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x503dc3d)
#27 0x0000000000de5a6c cc1_main(llvm::ArrayRef<char const*>, char const*, void*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xde5a6c)
#28 0x0000000000ddc4ba ExecuteCC1Tool(llvm::SmallVectorImpl<char const*>&, llvm::ToolContext const&, llvm::IntrusiveRefCntPtr<llvm::vfs::FileSystem>) driver.cpp:0:0
#29 0x0000000000ddc63d 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
#30 0x0000000004cbf909 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
#31 0x000000000422e2d4 llvm::CrashRecoveryContext::RunSafely(llvm::function_ref<void ()>) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x422e2d4)
#32 0x0000000004cbff1f 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
#33 0x0000000004c80a02 clang::driver::Compilation::ExecuteCommand(clang::driver::Command const&, clang::driver::Command const*&, bool) const (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4c80a02)
#34 0x0000000004c819ae 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+++0x4c819ae)
#35 0x0000000004c88e05 clang::driver::Driver::ExecuteCompilation(clang::driver::Compilation&, llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*>>&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4c88e05)
#36 0x0000000000de1e61 clang_main(int, char**, llvm::ToolContext const&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xde1e61)
#37 0x0000000000c8ceb4 main (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xc8ceb4)
#38 0x000077ea3b429d90 (/lib/x86_64-linux-gnu/libc.so.6+0x29d90)
#39 0x000077ea3b429e40 __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x29e40)
#40 0x0000000000ddbf55 _start (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xddbf55)
clang++: error: clang frontend command failed with exit code 134 (use -v to see invocation)
Compiler returned: 134
```
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