| Issue |
176405
|
| Summary |
[Clang] Assertion `Param->hasDefaultArg() && "can't build nonexistent default arg"` failed.
|
| Labels |
clang
|
| Assignees |
|
| Reporter |
Xniao
|
***Generated by fuzzer.***
Clang trunk crashed and goes back to 17.0.1.
GCC and clang 16 accept the c++ code.
Compiler Explorer: https://godbolt.org/z/n3vaeG1br
Same assertion as #139053, but with different stack dump.
## Program
```cpp
template <int> struct bad {
template <auto = []<typename... U>(U...) {}()> struct X;
static int f() {
}
};
int y = bad<0>::f();
```
## Stack Dump
```bash
<source>:2:22: warning: explicit template parameter list for lambdas is a C++20 extension [-Wc++20-extensions]
2 | template <auto = []<typename... U>(U...) {}()> struct X;
| ^
clang++: /root/llvm-project/llvm/tools/clang/lib/Sema/SemaExpr.cpp:5633: clang::ExprResult clang::Sema::BuildCXXDefaultArgExpr(clang::SourceLocation, clang::FunctionDecl*, clang::ParmVarDecl*, clang::Expr*): Assertion `Param->hasDefaultArg() && "can't build nonexistent default arg"' 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 <source>
1. <source>:6:17: current parser token 'f'
2. <source>:1:23: instantiating class definition 'bad<0>'
#0 0x000000000430a6b8 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x430a6b8)
#1 0x0000000004307b14 llvm::sys::CleanupOnSignal(unsigned long) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4307b14)
#2 0x0000000004249de8 CrashRecoverySignalHandler(int) CrashRecoveryContext.cpp:0:0
#3 0x000077e9ed042520 (/lib/x86_64-linux-gnu/libc.so.6+0x42520)
#4 0x000077e9ed0969fc pthread_kill (/lib/x86_64-linux-gnu/libc.so.6+0x969fc)
#5 0x000077e9ed042476 gsignal (/lib/x86_64-linux-gnu/libc.so.6+0x42476)
#6 0x000077e9ed0287f3 abort (/lib/x86_64-linux-gnu/libc.so.6+0x287f3)
#7 0x000077e9ed02871b (/lib/x86_64-linux-gnu/libc.so.6+0x2871b)
#8 0x000077e9ed039e96 (/lib/x86_64-linux-gnu/libc.so.6+0x39e96)
#9 0x0000000006fbb385 clang::Sema::BuildCXXDefaultArgExpr(clang::SourceLocation, clang::FunctionDecl*, clang::ParmVarDecl*, clang::Expr*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6fbb385)
#10 0x0000000007334e2b PrepareArgumentsForCallToObjectOfClassType(clang::Sema&, llvm::SmallVectorImpl<clang::Expr*>&, clang::CXXMethodDecl*, llvm::MutableArrayRef<clang::Expr*>, clang::SourceLocation) SemaOverload.cpp:0:0
#11 0x0000000007387100 clang::Sema::BuildCallToObjectOfClassType(clang::Scope*, clang::Expr*, clang::SourceLocation, llvm::MutableArrayRef<clang::Expr*>, clang::SourceLocation) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x7387100)
#12 0x0000000006fdeaa4 clang::Sema::BuildCallExpr(clang::Scope*, clang::Expr*, clang::SourceLocation, llvm::MutableArrayRef<clang::Expr*>, clang::SourceLocation, clang::Expr*, bool, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6fdeaa4)
#13 0x0000000006fe39fc clang::Sema::ActOnCallExpr(clang::Scope*, clang::Expr*, clang::SourceLocation, llvm::MutableArrayRef<clang::Expr*>, clang::SourceLocation, clang::Expr*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6fe39fc)
#14 0x00000000075c12e3 clang::TreeTransform<(anonymous namespace)::TemplateInstantiator>::TransformCallExpr(clang::CallExpr*) SemaTemplateInstantiate.cpp:0:0
#15 0x000000000759df58 clang::TreeTransform<(anonymous namespace)::TemplateInstantiator>::TransformExpr(clang::Expr*) SemaTemplateInstantiate.cpp:0:0
#16 0x00000000075b5277 (anonymous namespace)::TemplateInstantiator::TransformTemplateArgument(clang::TemplateArgumentLoc const&, clang::TemplateArgumentLoc&, bool) SemaTemplateInstantiate.cpp:0:0
#17 0x00000000075b5817 clang::Sema::SubstTemplateArgument(clang::TemplateArgumentLoc const&, clang::MultiLevelTemplateArgumentList const&, clang::TemplateArgumentLoc&, clang::SourceLocation, clang::DeclarationName const&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x75b5817)
#18 0x000000000762c8d5 clang::TemplateDeclInstantiator::VisitNonTypeTemplateParmDecl(clang::NonTypeTemplateParmDecl*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x762c8d5)
#19 0x000000000768f730 clang::TemplateDeclInstantiator::SubstTemplateParams(clang::TemplateParameterList*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x768f730)
#20 0x0000000007692f51 clang::TemplateDeclInstantiator::VisitClassTemplateDecl(clang::ClassTemplateDecl*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x7692f51)
#21 0x00000000075b30fb clang::Sema::InstantiateClassImpl(clang::SourceLocation, clang::CXXRecordDecl*, clang::CXXRecordDecl*, clang::MultiLevelTemplateArgumentList const&, clang::TemplateSpecializationKind, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x75b30fb)
#22 0x000000000761f0ae clang::Sema::InstantiateClassTemplateSpecialization(clang::SourceLocation, clang::ClassTemplateSpecializationDecl*, clang::TemplateSpecializationKind, bool, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x761f0ae)
#23 0x00000000076a036e 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
#24 0x00000000085535d1 clang::StackExhaustionHandler::runWithSufficientStackSpace(clang::SourceLocation, llvm::function_ref<void ()>) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x85535d1)
#25 0x00000000076abc63 clang::Sema::RequireCompleteTypeImpl(clang::SourceLocation, clang::QualType, clang::Sema::CompleteTypeKind, clang::Sema::TypeDiagnoser*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x76abc63)
#26 0x00000000076ac0ff clang::Sema::RequireCompleteType(clang::SourceLocation, clang::QualType, clang::Sema::CompleteTypeKind, clang::Sema::TypeDiagnoser&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x76ac0ff)
#27 0x0000000006c72ef3 clang::Sema::RequireCompleteDeclContext(clang::CXXScopeSpec&, clang::DeclContext*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6c72ef3)
#28 0x0000000006e64e1f clang::Sema::getTypeName(clang::IdentifierInfo const&, clang::SourceLocation, clang::Scope*, clang::CXXScopeSpec*, bool, bool, clang::OpaquePtr<clang::QualType>, bool, bool, bool, clang::ImplicitTypenameContext, clang::IdentifierInfo**) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6e64e1f)
#29 0x0000000006a630ac clang::Parser::TryAnnotateTypeOrScopeTokenAfterScopeSpec(clang::CXXScopeSpec&, bool, clang::ImplicitTypenameContext) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6a630ac)
#30 0x0000000006a666a9 clang::Parser::TryAnnotateTypeOrScopeToken(clang::ImplicitTypenameContext) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6a666a9)
#31 0x0000000006ade1ee clang::Parser::ParseCastExpression(clang::CastParseKind, bool, bool&, clang::TypoCorrectionTypeBehavior, bool, bool*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6ade1ee)
#32 0x0000000006ae0217 clang::Parser::ParseCastExpression(clang::CastParseKind, bool, clang::TypoCorrectionTypeBehavior, bool, bool*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6ae0217)
#33 0x0000000006ae02a9 clang::Parser::ParseAssignmentExpression(clang::TypoCorrectionTypeBehavior) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6ae02a9)
#34 0x0000000006b08790 clang::Parser::ParseInitializer(clang::Decl*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6b08790)
#35 0x0000000006a99c8f clang::Parser::ParseDeclarationAfterDeclaratorAndAttributes(clang::Declarator&, clang::Parser::ParsedTemplateInfo const&, clang::Parser::ForRangeInit*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6a99c8f)
#36 0x0000000006aa702a 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+++0x6aa702a)
#37 0x0000000006a6472b clang::Parser::ParseDeclOrFunctionDefInternal(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec&, clang::AccessSpecifier) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6a6472b)
#38 0x0000000006a64f1f clang::Parser::ParseDeclarationOrFunctionDefinition(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec*, clang::AccessSpecifier) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6a64f1f)
#39 0x0000000006a6cd4a clang::Parser::ParseExternalDeclaration(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6a6cd4a)
#40 0x0000000006a6dce5 clang::Parser::ParseTopLevelDecl(clang::OpaquePtr<clang::DeclGroupRef>&, clang::Sema::ModuleImportState&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6a6dce5)
#41 0x0000000006a4ed6a clang::ParseAST(clang::Sema&, bool, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6a4ed6a)
#42 0x0000000004c722a8 clang::CodeGenAction::ExecuteAction() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4c722a8)
#43 0x0000000004f6bc55 clang::FrontendAction::Execute() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4f6bc55)
#44 0x0000000004eeb8de clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4eeb8de)
#45 0x000000000506698d clang::ExecuteCompilerInvocation(clang::CompilerInstance*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x506698d)
#46 0x0000000000ddcf9e cc1_main(llvm::ArrayRef<char const*>, char const*, void*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xddcf9e)
#47 0x0000000000dd396a ExecuteCC1Tool(llvm::SmallVectorImpl<char const*>&, llvm::ToolContext const&, llvm::IntrusiveRefCntPtr<llvm::vfs::FileSystem>) driver.cpp:0:0
#48 0x0000000000dd3aed 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
#49 0x0000000004ce55a9 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
#50 0x000000000424a284 llvm::CrashRecoveryContext::RunSafely(llvm::function_ref<void ()>) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x424a284)
#51 0x0000000004ce5bbf 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
#52 0x0000000004ca6592 clang::driver::Compilation::ExecuteCommand(clang::driver::Command const&, clang::driver::Command const*&, bool) const (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4ca6592)
#53 0x0000000004ca753e 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+++0x4ca753e)
#54 0x0000000004cae985 clang::driver::Driver::ExecuteCompilation(clang::driver::Compilation&, llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*>>&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4cae985)
#55 0x0000000000dd9311 clang_main(int, char**, llvm::ToolContext const&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xdd9311)
#56 0x0000000000c969c4 main (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xc969c4)
#57 0x000077e9ed029d90 (/lib/x86_64-linux-gnu/libc.so.6+0x29d90)
#58 0x000077e9ed029e40 __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x29e40)
#59 0x0000000000dd3405 _start (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xdd3405)
clang++: error: clang frontend command failed with exit code 134 (use -v to see invocation)
Compiler returned: 134
```
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