| Issue |
181933
|
| Summary |
[clang] Assertion failure in CXXNameMangler::manglePrefix()
|
| Labels |
clang
|
| Assignees |
|
| Reporter |
patrykstefanski
|
When compiling the following code, Clang 21.1.0 hits an assertion failure. It happens after 6d00c4297f6714c03ab10f57c10063ebd79264a1 CC @cor3ntin.
https://godbolt.org/z/Ye3KvPxTT
Code:
```cpp
// clang++ -std=c++23 ./bug.cpp
template <typename Predicate>
void foo(Predicate pred) {
pred(42);
}
template <typename Predicate>
auto bar(Predicate pred) {
foo(pred);
}
template <typename T>
concept Baz = requires(const T& x) {
{
bar([](const auto&) { return true; })
};
};
static_assert(Baz<int>);
```
Stacktrace:
```
clang++: /root/llvm-project/llvm/include/llvm/Support/Casting.h:578: decltype(auto) llvm::cast(From*) [with To = clang::NamedDecl; From = const clang::DeclContext]: Assertion `isa<To>(Val) && "cast<Ty>() argument of incompatible type!"' 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-21.1.0/bin/clang++ -g -o /app/output.s -mllvm --x86-asm-syntax=intel -fno-verbose-asm -S --gcc-toolchain=/opt/compiler-explorer/gcc-15.2.0 -fcolor-diagnostics -fno-crash-diagnostics -std=c++23 <source>
1. <eof> parser at end of file
2. <source>:3:6: instantiating function definition 'foo<(lambda at <source>:15:9)>'
3. <source>:15:9: instantiating function definition '(anonymous class)::operator()<int>'
4. <source>:15:9: LLVM IR generation of declaration '(anonymous class)::operator()'
5. <source>:15:9: Mangling declaration '(anonymous class)::operator()'
#0 0x0000000004019ae8 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/opt/compiler-explorer/clang-assertions-21.1.0/bin/clang+++0x4019ae8)
#1 0x0000000004016f14 llvm::sys::CleanupOnSignal(unsigned long) (/opt/compiler-explorer/clang-assertions-21.1.0/bin/clang+++0x4016f14)
#2 0x0000000003f5b698 CrashRecoverySignalHandler(int) CrashRecoveryContext.cpp:0:0
#3 0x0000759668042520 (/lib/x86_64-linux-gnu/libc.so.6+0x42520)
#4 0x00007596680969fc pthread_kill (/lib/x86_64-linux-gnu/libc.so.6+0x969fc)
#5 0x0000759668042476 gsignal (/lib/x86_64-linux-gnu/libc.so.6+0x42476)
#6 0x00007596680287f3 abort (/lib/x86_64-linux-gnu/libc.so.6+0x287f3)
#7 0x000075966802871b (/lib/x86_64-linux-gnu/libc.so.6+0x2871b)
#8 0x0000759668039e96 (/lib/x86_64-linux-gnu/libc.so.6+0x39e96)
#9 0x0000000007b97f9c (anonymous namespace)::CXXNameMangler::manglePrefix(clang::DeclContext const*, bool) ItaniumMangle.cpp:0:0
#10 0x0000000007b97efd (anonymous namespace)::CXXNameMangler::manglePrefix(clang::DeclContext const*, bool) ItaniumMangle.cpp:0:0
#11 0x0000000007b9809d (anonymous namespace)::CXXNameMangler::mangleTemplatePrefix(clang::GlobalDecl, bool) ItaniumMangle.cpp:0:0
#12 0x0000000007bb2a0f (anonymous namespace)::CXXNameMangler::mangleNestedName(clang::GlobalDecl, clang::DeclContext const*, llvm::SmallVector<llvm::StringRef, 4u> const*, bool) ItaniumMangle.cpp:0:0
#13 0x0000000007b99155 (anonymous namespace)::CXXNameMangler::mangleNameWithAbiTags(clang::GlobalDecl, llvm::SmallVector<llvm::StringRef, 4u> const*) ItaniumMangle.cpp:0:0
#14 0x0000000007b99e1f (anonymous namespace)::CXXNameMangler::mangleName(clang::GlobalDecl) ItaniumMangle.cpp:0:0
#15 0x0000000007bab291 (anonymous namespace)::CXXNameMangler::mangleFunctionEncoding(clang::GlobalDecl) ItaniumMangle.cpp:0:0
#16 0x0000000007bac3d7 (anonymous namespace)::CXXNameMangler::mangle(clang::GlobalDecl) ItaniumMangle.cpp:0:0
#17 0x0000000007baea61 (anonymous namespace)::ItaniumMangleContextImpl::mangleCXXName(clang::GlobalDecl, llvm::raw_ostream&) ItaniumMangle.cpp:0:0
#18 0x0000000007bd367b clang::MangleContext::mangleName(clang::GlobalDecl, llvm::raw_ostream&) (/opt/compiler-explorer/clang-assertions-21.1.0/bin/clang+++0x7bd367b)
#19 0x0000000004594c65 getMangledNameImpl(clang::CodeGen::CodeGenModule&, clang::GlobalDecl, clang::NamedDecl const*, bool) CodeGenModule.cpp:0:0
#20 0x00000000045a8a5d clang::CodeGen::CodeGenModule::getMangledName(clang::GlobalDecl) (/opt/compiler-explorer/clang-assertions-21.1.0/bin/clang+++0x45a8a5d)
#21 0x00000000045e2698 clang::CodeGen::CodeGenModule::EmitGlobal(clang::GlobalDecl) (/opt/compiler-explorer/clang-assertions-21.1.0/bin/clang+++0x45e2698)
#22 0x00000000045ed413 clang::CodeGen::CodeGenModule::EmitTopLevelDecl(clang::Decl*) (.part.0) CodeGenModule.cpp:0:0
#23 0x00000000049d3d70 (anonymous namespace)::CodeGeneratorImpl::HandleTopLevelDecl(clang::DeclGroupRef) ModuleBuilder.cpp:0:0
#24 0x00000000049c33b4 clang::BackendConsumer::HandleTopLevelDecl(clang::DeclGroupRef) (/opt/compiler-explorer/clang-assertions-21.1.0/bin/clang+++0x49c33b4)
#25 0x00000000072ab62a clang::Sema::InstantiateFunctionDefinition(clang::SourceLocation, clang::FunctionDecl*, bool, bool, bool) (/opt/compiler-explorer/clang-assertions-21.1.0/bin/clang+++0x72ab62a)
#26 0x0000000007f77341 clang::StackExhaustionHandler::runWithSufficientStackSpace(clang::SourceLocation, llvm::function_ref<void ()>) (/opt/compiler-explorer/clang-assertions-21.1.0/bin/clang+++0x7f77341)
#27 0x000000000713acea clang::Sema::DeduceReturnType(clang::FunctionDecl*, clang::SourceLocation, bool) (/opt/compiler-explorer/clang-assertions-21.1.0/bin/clang+++0x713acea)
#28 0x0000000006be8f73 clang::Sema::DiagnoseUseOfDecl(clang::NamedDecl*, llvm::ArrayRef<clang::SourceLocation>, clang::ObjCInterfaceDecl const*, bool, bool, clang::ObjCInterfaceDecl*, bool) (/opt/compiler-explorer/clang-assertions-21.1.0/bin/clang+++0x6be8f73)
#29 0x0000000006f78097 CreateFunctionRefExpr(clang::Sema&, clang::FunctionDecl*, clang::NamedDecl*, clang::Expr const*, bool, clang::SourceLocation, clang::DeclarationNameLoc const&) SemaOverload.cpp:0:0
#30 0x0000000006fbb222 clang::Sema::BuildCallToObjectOfClassType(clang::Scope*, clang::Expr*, clang::SourceLocation, llvm::MutableArrayRef<clang::Expr*>, clang::SourceLocation) (/opt/compiler-explorer/clang-assertions-21.1.0/bin/clang+++0x6fbb222)
#31 0x0000000006c313a5 clang::Sema::BuildCallExpr(clang::Scope*, clang::Expr*, clang::SourceLocation, llvm::MutableArrayRef<clang::Expr*>, clang::SourceLocation, clang::Expr*, bool, bool) (/opt/compiler-explorer/clang-assertions-21.1.0/bin/clang+++0x6c313a5)
#32 0x0000000006c3200e clang::Sema::ActOnCallExpr(clang::Scope*, clang::Expr*, clang::SourceLocation, llvm::MutableArrayRef<clang::Expr*>, clang::SourceLocation, clang::Expr*) (/opt/compiler-explorer/clang-assertions-21.1.0/bin/clang+++0x6c3200e)
#33 0x000000000722ab50 clang::TreeTransform<(anonymous namespace)::TemplateInstantiator>::TransformCallExpr(clang::CallExpr*) SemaTemplateInstantiate.cpp:0:0
#34 0x00000000071fdf72 clang::TreeTransform<(anonymous namespace)::TemplateInstantiator>::TransformExpr(clang::Expr*) SemaTemplateInstantiate.cpp:0:0
#35 0x0000000007241a47 clang::TreeTransform<(anonymous namespace)::TemplateInstantiator>::TransformStmt(clang::Stmt*, clang::TreeTransform<(anonymous namespace)::TemplateInstantiator>::StmtDiscardKind) SemaTemplateInstantiate.cpp:0:0
#36 0x00000000072420ce clang::TreeTransform<(anonymous namespace)::TemplateInstantiator>::TransformCompoundStmt(clang::CompoundStmt*, bool) SemaTemplateInstantiate.cpp:0:0
#37 0x000000000724b764 clang::Sema::SubstStmt(clang::Stmt*, clang::MultiLevelTemplateArgumentList const&) (/opt/compiler-explorer/clang-assertions-21.1.0/bin/clang+++0x724b764)
#38 0x00000000072ab980 clang::Sema::InstantiateFunctionDefinition(clang::SourceLocation, clang::FunctionDecl*, bool, bool, bool) (/opt/compiler-explorer/clang-assertions-21.1.0/bin/clang+++0x72ab980)
#39 0x00000000072a9646 clang::Sema::PerformPendingInstantiations(bool, bool) (/opt/compiler-explorer/clang-assertions-21.1.0/bin/clang+++0x72a9646)
#40 0x000000000687bb12 clang::Sema::ActOnEndOfTranslationUnitFragment(clang::TUFragmentKind) (.part.0) Sema.cpp:0:0
#41 0x000000000687be92 clang::Sema::ActOnEndOfTranslationUnit() (/opt/compiler-explorer/clang-assertions-21.1.0/bin/clang+++0x687be92)
#42 0x00000000066d8aa0 clang::Parser::ParseTopLevelDecl(clang::OpaquePtr<clang::DeclGroupRef>&, clang::Sema::ModuleImportState&) (/opt/compiler-explorer/clang-assertions-21.1.0/bin/clang+++0x66d8aa0)
#43 0x00000000066ca73a clang::ParseAST(clang::Sema&, bool, bool) (/opt/compiler-explorer/clang-assertions-21.1.0/bin/clang+++0x66ca73a)
#44 0x00000000049cfa28 clang::CodeGenAction::ExecuteAction() (/opt/compiler-explorer/clang-assertions-21.1.0/bin/clang+++0x49cfa28)
#45 0x0000000004cc9f95 clang::FrontendAction::Execute() (/opt/compiler-explorer/clang-assertions-21.1.0/bin/clang+++0x4cc9f95)
#46 0x0000000004c4688e clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) (/opt/compiler-explorer/clang-assertions-21.1.0/bin/clang+++0x4c4688e)
#47 0x0000000004dbc2e1 clang::ExecuteCompilerInvocation(clang::CompilerInstance*) (/opt/compiler-explorer/clang-assertions-21.1.0/bin/clang+++0x4dbc2e1)
#48 0x0000000000d93cff cc1_main(llvm::ArrayRef<char const*>, char const*, void*) (/opt/compiler-explorer/clang-assertions-21.1.0/bin/clang+++0xd93cff)
#49 0x0000000000d8a8ba ExecuteCC1Tool(llvm::SmallVectorImpl<char const*>&, llvm::ToolContext const&) driver.cpp:0:0
#50 0x0000000004a36b79 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
#51 0x0000000003f5bb34 llvm::CrashRecoveryContext::RunSafely(llvm::function_ref<void ()>) (/opt/compiler-explorer/clang-assertions-21.1.0/bin/clang+++0x3f5bb34)
#52 0x0000000004a3718f 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
#53 0x00000000049f915d clang::driver::Compilation::ExecuteCommand(clang::driver::Command const&, clang::driver::Command const*&, bool) const (/opt/compiler-explorer/clang-assertions-21.1.0/bin/clang+++0x49f915d)
#54 0x00000000049fa1ee clang::driver::Compilation::ExecuteJobs(clang::driver::JobList const&, llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*>>&, bool) const (/opt/compiler-explorer/clang-assertions-21.1.0/bin/clang+++0x49fa1ee)
#55 0x0000000004a02d85 clang::driver::Driver::ExecuteCompilation(clang::driver::Compilation&, llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*>>&) (/opt/compiler-explorer/clang-assertions-21.1.0/bin/clang+++0x4a02d85)
#56 0x0000000000d9018f clang_main(int, char**, llvm::ToolContext const&) (/opt/compiler-explorer/clang-assertions-21.1.0/bin/clang+++0xd9018f)
#57 0x0000000000c444d4 main (/opt/compiler-explorer/clang-assertions-21.1.0/bin/clang+++0xc444d4)
#58 0x0000759668029d90 (/lib/x86_64-linux-gnu/libc.so.6+0x29d90)
#59 0x0000759668029e40 __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x29e40)
#60 0x0000000000d8a365 _start (/opt/compiler-explorer/clang-assertions-21.1.0/bin/clang+++0xd8a365)
clang++: error: clang frontend command failed with exit code 134 (use -v to see invocation)
Compiler returned: 134
```
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