| Issue |
184682
|
| Summary |
clang: crash in `Module::getFullModuleName` on redefining default template argument in global module fragment
|
| Labels |
clang
|
| Assignees |
|
| Reporter |
adityasz
|
```cpp
module;
template <class A, class = A> class foo;
template <class, class = void> class foo;
```
x86-64 clang (trunk) on [Compiler Explorer](https://godbolt.org/#g:!((g:!((g:!((h:codeEditor,i:(filename:'1',fontScale:14,fontUsePx:'0',j:1,lang:c%2B%2B,selection:(endColumn:1,endLineNumber:5,positionColumn:1,positionLineNumber:5,selectionStartColumn:1,selectionStartLineNumber:5,startColumn:1,startLineNumber:5),source:'module%3B%0Atemplate+%3Cclass+A,+class+%3D+A%3E+class+foo%3B%0Atemplate+%3Cclass,+class+%3D+void%3E+class+foo%3B%0A%0A'),l:'5',n:'0',o:'C%2B%2B+source+%231',t:'0')),k:50,l:'4',n:'0',o:'',s:0,t:'0'),(g:!((g:!((h:compiler,i:(compiler:clang_trunk,filters:(b:'0',binary:'1',binaryObject:'1',commentOnly:'0',debugCalls:'1',demangle:'0',directives:'0',execute:'1',intel:'0',libraryCode:'0',trim:'1',verboseDemangling:'0'),flagsViewOpen:'1',fontScale:14,fontUsePx:'0',j:1,lang:c%2B%2B,libs:!(),options:'-std%3Dc%2B%2B26',overrides:!(),selection:(endColumn:1,endLineNumber:1,positionColumn:1,positionLineNumber:1,selectionStartColumn:1,selectionStartLineNumber:1,startColumn:1,startLineNumber:1),source:1),l:'5',n:'0',o:'+x86-64+clang+(trunk)+(Editor+%231)',t:'0')),k:50,l:'4',m:50,n:'0',o:'',s:0,t:'0'),(g:!((h:output,i:(compilerName:'x86-64+gcc+15.2',editorid:1,fontScale:14,fontUsePx:'0',j:1,wrap:'1'),l:'5',n:'0',o:'Output+of+x86-64+clang+(trunk)+(Compiler+%231)',t:'0')),header:(),l:'4',m:50,n:'0',o:'',s:0,t:'0')),k:50,l:'3',n:'0',o:'',t:'0')),l:'2',n:'0',o:'',t:'0')),version:4). Also reproducible in 21.1.8.
```
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 -std=c++26 <source>
1. <source>:3:41: current parser token ';'
#0 0x0000000003e398d8 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x3e398d8)
#1 0x0000000003e372bc llvm::sys::CleanupOnSignal(unsigned long) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x3e372bc)
#2 0x0000000003d79ce8 CrashRecoverySignalHandler(int) CrashRecoveryContext.cpp:0:0
#3 0x00007f2b38042520 (/lib/x86_64-linux-gnu/libc.so.6+0x42520)
#4 0x0000000007dc1348 clang::Module::getFullModuleName[abi:cxx11](bool) const (/opt/compiler-explorer/clang-trunk/bin/clang+++0x7dc1348)
#5 0x0000000006e065e6 clang::Sema::CheckTemplateParameterList(clang::TemplateParameterList*, clang::TemplateParameterList*, clang::Sema::TemplateParamListContext, clang::SkipBodyInfo*) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x6e065e6)
#6 0x0000000006e6b888 clang::Sema::CheckClassTemplate(clang::Scope*, unsigned int, clang::TagUseKind, clang::SourceLocation, clang::CXXScopeSpec&, clang::IdentifierInfo*, clang::SourceLocation, clang::ParsedAttributesView const&, clang::TemplateParameterList*, clang::AccessSpecifier, clang::SourceLocation, clang::SourceLocation, unsigned int, clang::TemplateParameterList**, clang::SkipBodyInfo*) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x6e6b888)
#7 0x00000000067d14d6 clang::Sema::ActOnTag(clang::Scope*, unsigned int, clang::TagUseKind, clang::SourceLocation, clang::CXXScopeSpec&, clang::IdentifierInfo*, clang::SourceLocation, clang::ParsedAttributesView const&, clang::AccessSpecifier, clang::SourceLocation, llvm::MutableArrayRef<clang::TemplateParameterList*>, bool&, bool&, clang::SourceLocation, bool, clang::ActionResult<clang::OpaquePtr<clang::QualType>, false>, bool, bool, clang::OffsetOfKind, clang::SkipBodyInfo*) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x67d14d6)
#8 0x000000000646966b clang::Parser::ParseClassSpecifier(clang::tok::TokenKind, clang::SourceLocation, clang::DeclSpec&, clang::Parser::ParsedTemplateInfo&, clang::AccessSpecifier, bool, clang::Parser::DeclSpecContext, clang::ParsedAttributes&) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x646966b)
#9 0x000000000643370f clang::Parser::ParseDeclarationSpecifiers(clang::DeclSpec&, clang::Parser::ParsedTemplateInfo&, clang::AccessSpecifier, clang::Parser::DeclSpecContext, clang::Parser::LateParsedAttrList*, clang::ImplicitTypenameContext) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x643370f)
#10 0x0000000006516ab7 clang::Parser::ParseDeclarationAfterTemplate(clang::DeclaratorContext, clang::Parser::ParsedTemplateInfo&, clang::ParsingDeclRAIIObject&, clang::SourceLocation&, clang::ParsedAttributes&, clang::AccessSpecifier) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x6516ab7)
#11 0x0000000006524dbb clang::Parser::ParseTemplateDeclarationOrSpecialization(clang::DeclaratorContext, clang::SourceLocation&, clang::ParsedAttributes&, clang::AccessSpecifier) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x6524dbb)
#12 0x000000000652512f clang::Parser::ParseDeclarationStartingWithTemplate(clang::DeclaratorContext, clang::SourceLocation&, clang::ParsedAttributes&) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x652512f)
#13 0x0000000006445253 clang::Parser::ParseDeclaration(clang::DeclaratorContext, clang::SourceLocation&, clang::ParsedAttributes&, clang::ParsedAttributes&, clang::SourceLocation*) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x6445253)
#14 0x00000000063f8051 clang::Parser::ParseExternalDeclaration(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec*) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x63f8051)
#15 0x00000000063f9927 clang::Parser::ParseTopLevelDecl(clang::OpaquePtr<clang::DeclGroupRef>&, clang::Sema::ModuleImportState&) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x63f9927)
#16 0x00000000063d27ba clang::ParseAST(clang::Sema&, bool, bool) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x63d27ba)
#17 0x000000000481fd85 clang::CodeGenAction::ExecuteAction() (/opt/compiler-explorer/clang-trunk/bin/clang+++0x481fd85)
#18 0x0000000004b4233a clang::FrontendAction::Execute() (/opt/compiler-explorer/clang-trunk/bin/clang+++0x4b4233a)
#19 0x0000000004abf32b clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x4abf32b)
#20 0x0000000004c39adb clang::ExecuteCompilerInvocation(clang::CompilerInstance*) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x4c39adb)
#21 0x0000000000df72c5 cc1_main(llvm::ArrayRef<char const*>, char const*, void*) (/opt/compiler-explorer/clang-trunk/bin/clang+++0xdf72c5)
#22 0x0000000000deef8b ExecuteCC1Tool(llvm::SmallVectorImpl<char const*>&, llvm::ToolContext const&, llvm::IntrusiveRefCntPtr<llvm::vfs::FileSystem>) driver.cpp:0:0
#23 0x0000000000def02d 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
#24 0x000000000489ba19 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
#25 0x0000000003d7a0a3 llvm::CrashRecoveryContext::RunSafely(llvm::function_ref<void ()>) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x3d7a0a3)
#26 0x000000000489bc39 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
#27 0x000000000485e412 clang::driver::Compilation::ExecuteCommand(clang::driver::Command const&, clang::driver::Command const*&, bool) const (/opt/compiler-explorer/clang-trunk/bin/clang+++0x485e412)
#28 0x000000000485f2f1 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+++0x485f2f1)
#29 0x000000000486817c clang::driver::Driver::ExecuteCompilation(clang::driver::Compilation&, llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*>>&) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x486817c)
#30 0x0000000000df3aa1 clang_main(int, char**, llvm::ToolContext const&) (/opt/compiler-explorer/clang-trunk/bin/clang+++0xdf3aa1)
#31 0x0000000000ca3c2a main (/opt/compiler-explorer/clang-trunk/bin/clang+++0xca3c2a)
#32 0x00007f2b38029d90 (/lib/x86_64-linux-gnu/libc.so.6+0x29d90)
#33 0x00007f2b38029e40 __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x29e40)
#34 0x0000000000deea25 _start (/opt/compiler-explorer/clang-trunk/bin/clang+++0xdeea25)
clang++: error: clang frontend command failed due to signal (use -v to see invocation)
Compiler returned: 139
```
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