| Issue |
127539
|
| Summary |
[Clang] Crash on CTAD for alias template involving variadics
|
| Labels |
clang
|
| Assignees |
|
| Reporter |
MagentaTreehouse
|
```c++
template <class...>
struct A {
template <class... ArgTs>
A(ArgTs...) {}
};
template <class... ArgTs>
A(ArgTs...) -> A<typename ArgTs::value_type...>;
template <class... Ts>
using AA = A<Ts...>;
AA a{};
```
See https://compiler-explorer.com/z/3c8bYM5To.
Unreachable:
```console
Can't get a NULL template argument here
UNREACHABLE executed at /root/llvm-project/clang/lib/Sema/SemaTemplateDeduction.cpp:2894!
```
<details>
<summary>Stack dump</summary>
```console
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 -std=c++20 <source>
1. <source>:13:7: current parser token ';'
#0 0x0000000003e9bfd8 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x3e9bfd8)
#1 0x0000000003e99c94 llvm::sys::CleanupOnSignal(unsigned long) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x3e99c94)
#2 0x0000000003de6098 CrashRecoverySignalHandler(int) CrashRecoveryContext.cpp:0:0
#3 0x000072f907a42520 (/lib/x86_64-linux-gnu/libc.so.6+0x42520)
#4 0x000072f907a969fc pthread_kill (/lib/x86_64-linux-gnu/libc.so.6+0x969fc)
#5 0x000072f907a42476 gsignal (/lib/x86_64-linux-gnu/libc.so.6+0x42476)
#6 0x000072f907a287f3 abort (/lib/x86_64-linux-gnu/libc.so.6+0x287f3)
#7 0x0000000003df19fa (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x3df19fa)
#8 0x0000000006f33f4c clang::Sema::getTrivialTemplateArgumentLoc(clang::TemplateArgument const&, clang::QualType, clang::SourceLocation, clang::NamedDecl*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6f33f4c)
#9 0x0000000007046a57 (anonymous namespace)::TemplateInstantiator::TransformTemplateArgument(clang::TemplateArgumentLoc const&, clang::TemplateArgumentLoc&, bool) SemaTemplateInstantiate.cpp:0:0
#10 0x000000000704851e clang::Sema::SubstTemplateArgument(clang::TemplateArgumentLoc const&, clang::MultiLevelTemplateArgumentList const&, clang::TemplateArgumentLoc&, clang::SourceLocation, clang::DeclarationName const&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x704851e)
#11 0x0000000006fa3827 (anonymous namespace)::BuildDeductionGuideForTypeAlias(clang::Sema&, clang::TypeAliasTemplateDecl*, clang::FunctionTemplateDecl*, clang::SourceLocation) SemaTemplateDeductionGuide.cpp:0:0
#12 0x0000000006fe8b75 clang::Sema::DeclareImplicitDeductionGuides(clang::TemplateDecl*, clang::SourceLocation) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6fe8b75)
#13 0x0000000006bd4517 LookupDirect(clang::Sema&, clang::LookupResult&, clang::DeclContext const*) SemaLookup.cpp:0:0
#14 0x0000000006bbf842 clang::Sema::LookupQualifiedName(clang::LookupResult&, clang::DeclContext*, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6bbf842)
#15 0x0000000006b9e2fe clang::Sema::DeduceTemplateSpecializationFromInitializer(clang::TypeSourceInfo*, clang::InitializedEntity const&, clang::InitializationKind const&, llvm::MutableArrayRef<clang::Expr*>) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6b9e2fe)
#16 0x0000000006825c1d clang::Sema::deduceVarTypeFromInitializer(clang::VarDecl*, clang::DeclarationName, clang::QualType, clang::TypeSourceInfo*, clang::SourceRange, bool, clang::Expr*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6825c1d)
#17 0x000000000682a9e7 clang::Sema::DeduceVariableDeclarationType(clang::VarDecl*, bool, clang::Expr*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x682a9e7)
#18 0x0000000006849282 clang::Sema::AddInitializerToDecl(clang::Decl*, clang::Expr*, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6849282)
#19 0x00000000064d89f5 clang::Parser::ParseDeclarationAfterDeclaratorAndAttributes(clang::Declarator&, clang::Parser::ParsedTemplateInfo const&, clang::Parser::ForRangeInit*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x64d89f5)
#20 0x00000000064e7f19 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+++0x64e7f19)
#21 0x00000000064a791e clang::Parser::ParseDeclOrFunctionDefInternal(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec&, clang::AccessSpecifier) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x64a791e)
#22 0x00000000064a80d9 clang::Parser::ParseDeclarationOrFunctionDefinition(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec*, clang::AccessSpecifier) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x64a80d9)
#23 0x00000000064af883 clang::Parser::ParseExternalDeclaration(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x64af883)
#24 0x00000000064b077d clang::Parser::ParseTopLevelDecl(clang::OpaquePtr<clang::DeclGroupRef>&, clang::Sema::ModuleImportState&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x64b077d)
#25 0x00000000064a2c1a clang::ParseAST(clang::Sema&, bool, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x64a2c1a)
#26 0x000000000485dbb8 clang::CodeGenAction::ExecuteAction() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x485dbb8)
#27 0x0000000004b24a55 clang::FrontendAction::Execute() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4b24a55)
#28 0x0000000004aa835e clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4aa835e)
#29 0x0000000004c1324e clang::ExecuteCompilerInvocation(clang::CompilerInstance*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4c1324e)
#30 0x0000000000d65b8f cc1_main(llvm::ArrayRef<char const*>, char const*, void*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xd65b8f)
#31 0x0000000000d5d60a ExecuteCC1Tool(llvm::SmallVectorImpl<char const*>&, llvm::ToolContext const&) driver.cpp:0:0
#32 0x00000000048a41c9 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
#33 0x0000000003de6544 llvm::CrashRecoveryContext::RunSafely(llvm::function_ref<void ()>) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x3de6544)
#34 0x00000000048a47bf 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
#35 0x000000000486793d clang::driver::Compilation::ExecuteCommand(clang::driver::Command const&, clang::driver::Command const*&, bool) const (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x486793d)
#36 0x00000000048689be 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+++0x48689be)
#37 0x0000000004870975 clang::driver::Driver::ExecuteCompilation(clang::driver::Compilation&, llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*>>&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4870975)
#38 0x0000000000d62983 clang_main(int, char**, llvm::ToolContext const&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xd62983)
#39 0x0000000000c2b674 main (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xc2b674)
#40 0x000072f907a29d90 (/lib/x86_64-linux-gnu/libc.so.6+0x29d90)
#41 0x000072f907a29e40 __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x29e40)
#42 0x0000000000d5d0b5 _start (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xd5d0b5)
```
</details>
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