| Issue |
173349
|
| Summary |
[clang]Clang crash when forming `decltype` of static alias template member without template arguments
|
| Labels |
clang
|
| Assignees |
|
| Reporter |
Attacker23
|
The following code has been causing Clang to crash since version 16.0.0 and still does in the current trunk (x86‑64).
```cpp
template <class T>
struct A {
template <class U>
using E = U;
static E u;
};
decltype(A<int>::u) a;
```
Please check: https://godbolt.org/z/ovvr6KE1n
Clang crashes while emitting IR for the `a` declared as `decltype(A<int>::u)`, where `u` is declared using an alias template `E` without providing template arguments (ill-formed).
**Output:**
```
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-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. <eof> parser at end of file
2. <source>:8:21: LLVM IR generation of declaration 'a'
3. <source>:8:21: Generating code for declaration 'a'
#0 0x0000000003d38488 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x3d38488)
#1 0x0000000003d35e5c llvm::sys::CleanupOnSignal(unsigned long) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x3d35e5c)
#2 0x0000000003c7cde8 CrashRecoverySignalHandler(int) CrashRecoveryContext.cpp:0:0
#3 0x000079f62ba42520 (/lib/x86_64-linux-gnu/libc.so.6+0x42520)
#4 0x00000000036f8e32 llvm::Type::isIntegerTy(unsigned int) const (/opt/compiler-explorer/clang-trunk/bin/clang+++0x36f8e32)
#5 0x000000000430a7dd clang::CodeGen::CodeGenTypes::ConvertTypeForMem(clang::QualType) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x430a7dd)
#6 0x00000000040aeec7 clang::CodeGen::CodeGenModule::EmitNullConstant(clang::QualType) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x40aeec7)
#7 0x000000000428ec84 clang::CodeGen::CodeGenModule::EmitGlobalVarDefinition(clang::VarDecl const*, bool) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x428ec84)
#8 0x00000000042b0c35 clang::CodeGen::CodeGenModule::EmitGlobalDefinition(clang::GlobalDecl, llvm::GlobalValue*) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x42b0c35)
#9 0x00000000042b18e0 clang::CodeGen::CodeGenModule::EmitGlobal(clang::GlobalDecl) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x42b18e0)
#10 0x00000000042bc1ef clang::CodeGen::CodeGenModule::EmitTopLevelDecl(clang::Decl*) (.part.0) CodeGenModule.cpp:0:0
#11 0x00000000046078b1 (anonymous namespace)::CodeGeneratorImpl::HandleTopLevelDecl(clang::DeclGroupRef) ModuleBuilder.cpp:0:0
#12 0x00000000045f27b9 clang::BackendConsumer::HandleTopLevelDecl(clang::DeclGroupRef) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x45f27b9)
#13 0x00000000062545b4 clang::ParseAST(clang::Sema&, bool, bool) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x62545b4)
#14 0x0000000004605b55 clang::CodeGenAction::ExecuteAction() (/opt/compiler-explorer/clang-trunk/bin/clang+++0x4605b55)
#15 0x000000000491659a clang::FrontendAction::Execute() (/opt/compiler-explorer/clang-trunk/bin/clang+++0x491659a)
#16 0x00000000048944ab clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x48944ab)
#17 0x0000000004a0c9bb clang::ExecuteCompilerInvocation(clang::CompilerInstance*) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x4a0c9bb)
#18 0x0000000000de1f5d cc1_main(llvm::ArrayRef<char const*>, char const*, void*) (/opt/compiler-explorer/clang-trunk/bin/clang+++0xde1f5d)
#19 0x0000000000dd9ddb ExecuteCC1Tool(llvm::SmallVectorImpl<char const*>&, llvm::ToolContext const&, llvm::IntrusiveRefCntPtr<llvm::vfs::FileSystem>) driver.cpp:0:0
#20 0x0000000000dd9e7d 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
#21 0x000000000467fba9 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
#22 0x0000000003c7d203 llvm::CrashRecoveryContext::RunSafely(llvm::function_ref<void ()>) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x3c7d203)
#23 0x000000000467fdc9 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
#24 0x0000000004642fb2 clang::driver::Compilation::ExecuteCommand(clang::driver::Command const&, clang::driver::Command const*&, bool) const (/opt/compiler-explorer/clang-trunk/bin/clang+++0x4642fb2)
#25 0x0000000004643e91 clang::driver::Compilation::ExecuteJobs(clang::driver::JobList const&, llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*>>&, bool) const (/opt/compiler-explorer/clang-trunk/bin/clang+++0x4643e91)
#26 0x000000000464c8dc clang::driver::Driver::ExecuteCompilation(clang::driver::Compilation&, llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*>>&) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x464c8dc)
#27 0x0000000000dde8a9 clang_main(int, char**, llvm::ToolContext const&) (/opt/compiler-explorer/clang-trunk/bin/clang+++0xdde8a9)
#28 0x0000000000c8f7c4 main (/opt/compiler-explorer/clang-trunk/bin/clang+++0xc8f7c4)
#29 0x000079f62ba29d90 (/lib/x86_64-linux-gnu/libc.so.6+0x29d90)
#30 0x000079f62ba29e40 __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x29e40)
#31 0x0000000000dd9875 _start (/opt/compiler-explorer/clang-trunk/bin/clang+++0xdd9875)
clang++: error: clang frontend command failed with exit code 139 (use -v to see invocation)
Compiler returned: 139
```
The following code is correct:
```cpp
template <class T>
struct A {
template <class U>
using E = U;
static E<int> u; //correct code
};
decltype(A<int>::u) a;
```
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