[fuzz] Assertion `(NewDecl->getFriendObjectKind() || !OldDecl->getLexicalDeclContext()->isDependentContext()) && "non-friend with qualified name defined in dependent context"' failed.

[llvmbot]

Bugzilla Link	21871
Version	trunk
OS	Linux
Blocks	#23431
Attachments	test case
Reporter	LLVM Bugzilla Contributor
CC	@rnk

Extended Description

Fuzzing discovered that the attached test case, when given as input to

clang -fno-crash-diagnostics -std=c++11 -xc++ -c -emit-llvm

causes this assertion failure:

clang-3.6: tools/clang/lib/Sema/SemaTemplateInstantiateDecl.cpp:47: bool SubstQualifier(clang::Sema &, const DeclT *, DeclT *, const clang::MultiLevelTemplateArgumentList &) [DeclT = clang::TagDecl]: Assertion `(NewDecl->getFriendObjectKind() || !OldDecl->getLexicalDeclContext()->isDependentContext()) && "non-friend with qualified name defined in dependent context"' failed.

[rnk]

Still reproduces

[rnk]

Still reproduces

[kcc]

mentioned in issue #23431

[AaronBallman]

Still reproduces as of Clang 16 with the following stack trace:

clang++: /root/llvm-project/clang/lib/Sema/SemaTemplateInstantiateDecl.cpp:54: bool SubstQualifier(clang::Sema&, const DeclT*, DeclT*, const clang::MultiLevelTemplateArgumentList&) [with DeclT = clang::TagDecl]: Assertion `(NewDecl->getFriendObjectKind() || !OldDecl->getLexicalDeclContext()->isDependentContext()) && "non-friend with qualified name defined in dependent context"' 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++ -gdwarf-4 -g -o /app/output.s -mllvm --x86-asm-syntax=intel -S --gcc-toolchain=/opt/compiler-explorer/gcc-snapshot -fcolor-diagnostics -fno-crash-diagnostics <source>
1.	<eof> parser at end of file
2.	<source>:1:28: instantiating class definition 'SS<int>'
 #0 0x000055937961f24f llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x3c2824f)
 #1 0x000055937961cfbc llvm::sys::CleanupOnSignal(unsigned long) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x3c25fbc)
 #2 0x00005593795663b8 CrashRecoverySignalHandler(int) CrashRecoveryContext.cpp:0:0
 #3 0x00007fa0cce21420 __restore_rt (/lib/x86_64-linux-gnu/libpthread.so.0+0x14420)
 #4 0x00007fa0cc8ee00b raise (/lib/x86_64-linux-gnu/libc.so.6+0x4300b)
 #5 0x00007fa0cc8cd859 abort (/lib/x86_64-linux-gnu/libc.so.6+0x22859)
 #6 0x00007fa0cc8cd729 (/lib/x86_64-linux-gnu/libc.so.6+0x22729)
 #7 0x00007fa0cc8defd6 (/lib/x86_64-linux-gnu/libc.so.6+0x33fd6)
 #8 0x000055937c8f49e9 (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6efd9e9)
 #9 0x000055937c94bb63 clang::TemplateDeclInstantiator::InstantiateClassTemplatePartialSpecialization(clang::ClassTemplateDecl*, clang::ClassTemplatePartialSpecializationDecl*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6f54b63)
#10 0x000055937c8d1f49 clang::Sema::InstantiateClass(clang::SourceLocation, clang::CXXRecordDecl*, clang::CXXRecordDecl*, clang::MultiLevelTemplateArgumentList const&, clang::TemplateSpecializationKind, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6edaf49)
#11 0x000055937c8ef603 clang::Sema::InstantiateClassTemplateSpecialization(clang::SourceLocation, clang::ClassTemplateSpecializationDecl*, clang::TemplateSpecializationKind, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6ef8603)
#12 0x000055937c97beb3 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
#13 0x000055937becbc45 clang::Sema::runWithSufficientStackSpace(clang::SourceLocation, llvm::function_ref<void ()>) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x64d4c45)
#14 0x000055937c985417 clang::Sema::RequireCompleteTypeImpl(clang::SourceLocation, clang::QualType, clang::Sema::CompleteTypeKind, clang::Sema::TypeDiagnoser*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6f8e417)
#15 0x000055937c985769 clang::Sema::RequireCompleteType(clang::SourceLocation, clang::QualType, clang::Sema::CompleteTypeKind, clang::Sema::TypeDiagnoser&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6f8e769)
#16 0x000055937bf0cb0c clang::Sema::RequireCompleteDeclContext(clang::CXXScopeSpec&, clang::DeclContext*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6515b0c)
#17 0x000055937bf0f0b2 clang::Sema::ActOnCXXEnterDeclaratorScope(clang::Scope*, clang::CXXScopeSpec&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x65180b2)
#18 0x000055937bd9324e clang::Parser::DeclaratorScopeObj::EnterDeclaratorScope() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x639c24e)
#19 0x000055937bdb7e82 clang::Parser::ParseDirectDeclarator(clang::Declarator&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x63c0e82)
#20 0x000055937bda6737 clang::Parser::ParseDeclaratorInternal(clang::Declarator&, void (clang::Parser::*)(clang::Declarator&)) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x63af737)
#21 0x000055937becbc45 clang::Sema::runWithSufficientStackSpace(clang::SourceLocation, llvm::function_ref<void ()>) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x64d4c45)
#22 0x000055937bd96c43 clang::Parser::ParseDeclarator(clang::Declarator&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x639fc43)
#23 0x000055937be717a7 clang::Parser::ParseSingleDeclarationAfterTemplate(clang::DeclaratorContext, clang::Parser::ParsedTemplateInfo const&, clang::ParsingDeclRAIIObject&, clang::SourceLocation&, clang::ParsedAttributes&, clang::AccessSpecifier) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x647a7a7)
#24 0x000055937be77cb6 clang::Parser::ParseTemplateDeclarationOrSpecialization(clang::DeclaratorContext, clang::SourceLocation&, clang::ParsedAttributes&, clang::AccessSpecifier) (.part.0) ParseTemplate.cpp:0:0
#25 0x000055937be77f33 clang::Parser::ParseDeclarationStartingWithTemplate(clang::DeclaratorContext, clang::SourceLocation&, clang::ParsedAttributes&, clang::AccessSpecifier) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6480f33)
#26 0x000055937bdb219e clang::Parser::ParseDeclaration(clang::DeclaratorContext, clang::SourceLocation&, clang::ParsedAttributes&, clang::ParsedAttributes&, clang::SourceLocation*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x63bb19e)
#27 0x000055937bd7d3b4 clang::Parser::ParseExternalDeclaration(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x63863b4)
#28 0x000055937bd7e2f6 clang::Parser::ParseTopLevelDecl(clang::OpaquePtr<clang::DeclGroupRef>&, clang::Sema::ModuleImportState&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x63872f6)
#29 0x000055937bd720ba clang::ParseAST(clang::Sema&, bool, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x637b0ba)
#30 0x000055937a872598 clang::CodeGenAction::ExecuteAction() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4e7b598)
#31 0x000055937a0c2c79 clang::FrontendAction::Execute() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x46cbc79)
#32 0x000055937a047316 clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4650316)
#33 0x000055937a1a50b6 clang::ExecuteCompilerInvocation(clang::CompilerInstance*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x47ae0b6)
#34 0x0000559376ac816d cc1_main(llvm::ArrayRef<char const*>, char const*, void*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x10d116d)
#35 0x0000559376ac3e6a ExecuteCC1Tool(llvm::SmallVectorImpl<char const*>&, llvm::ToolContext const&) driver.cpp:0:0
#36 0x0000559379eafc1d 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
#37 0x00005593795668c0 llvm::CrashRecoveryContext::RunSafely(llvm::function_ref<void ()>) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x3b6f8c0)
#38 0x0000559379eb023f 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
#39 0x0000559379e77a1c clang::driver::Compilation::ExecuteCommand(clang::driver::Command const&, clang::driver::Command const*&, bool) const (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4480a1c)
#40 0x0000559379e784ad 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+++0x44814ad)
#41 0x0000559379e8058d clang::driver::Driver::ExecuteCompilation(clang::driver::Compilation&, llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*>>&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x448958d)
#42 0x0000559376ac63ca clang_main(int, char**, llvm::ToolContext const&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x10cf3ca)
#43 0x00005593769cd2b5 main (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xfd62b5)
#44 0x00007fa0cc8cf083 __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x24083)
#45 0x0000559376abec4e _start (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x10c7c4e)
clang++: error: clang frontend command failed with exit code 134 (use -v to see invocation)
Compiler returned: 134

[llvmbot]

@llvm/issue-subscribers-clang-frontend