Closed
Description
This testcase is generated by a fuzzer.
Compiler Explorer: https://godbolt.org/z/P1xE1dEx1
This invalid code will crash on Clang Assertion Trunk.
template <typename d> concept g = 0;
template <g> struct h;
template <g d>
struct h<d>;This won't crash in clang-19.
Stack dump:
clang++: /root/llvm-project/clang/lib/Sema/SemaConcept.cpp:1584: static std::optional<clang::NormalizedConstraint> clang::NormalizedConstraint::fromConstraintExpr(clang::Sema&, clang::NamedDecl*, const clang::Expr*): Assertion `E != nullptr' 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 -fno-verbose-asm -S --gcc-toolchain=/opt/compiler-explorer/gcc-snapshot -fcolor-diagnostics -fno-crash-diagnostics -std=c++20 <source>
1. <source>:4:12: current parser token ';'
#0 0x0000000003be9e28 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x3be9e28)
#1 0x0000000003be7b2c llvm::sys::CleanupOnSignal(unsigned long) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x3be7b2c)
#2 0x0000000003b35468 CrashRecoverySignalHandler(int) CrashRecoveryContext.cpp:0:0
#3 0x00007759bfe42520 (/lib/x86_64-linux-gnu/libc.so.6+0x42520)
#4 0x00007759bfe969fc pthread_kill (/lib/x86_64-linux-gnu/libc.so.6+0x969fc)
#5 0x00007759bfe42476 gsignal (/lib/x86_64-linux-gnu/libc.so.6+0x42476)
#6 0x00007759bfe287f3 abort (/lib/x86_64-linux-gnu/libc.so.6+0x287f3)
#7 0x00007759bfe2871b (/lib/x86_64-linux-gnu/libc.so.6+0x2871b)
#8 0x00007759bfe39e96 (/lib/x86_64-linux-gnu/libc.so.6+0x39e96)
#9 0x00000000069e2ad0 clang::NormalizedConstraint::fromConstraintExpr(clang::Sema&, clang::NamedDecl*, clang::Expr const*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x69e2ad0)
#10 0x00000000069e2b63 clang::NormalizedConstraint::fromConstraintExprs(clang::Sema&, clang::NamedDecl*, llvm::ArrayRef<clang::Expr const*>) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x69e2b63)
#11 0x00000000069e1f79 clang::Sema::getNormalizedAssociatedConstraints(clang::NamedDecl*, llvm::ArrayRef<clang::Expr const*>) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x69e1f79)
#12 0x00000000069e25e3 clang::NormalizedConstraint::fromConstraintExpr(clang::Sema&, clang::NamedDecl*, clang::Expr const*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x69e25e3)
#13 0x00000000069e2b63 clang::NormalizedConstraint::fromConstraintExprs(clang::Sema&, clang::NamedDecl*, llvm::ArrayRef<clang::Expr const*>) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x69e2b63)
#14 0x00000000069e1f79 clang::Sema::getNormalizedAssociatedConstraints(clang::NamedDecl*, llvm::ArrayRef<clang::Expr const*>) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x69e1f79)
#15 0x00000000069f4a74 clang::Sema::IsAtLeastAsConstrained(clang::NamedDecl*, llvm::MutableArrayRef<clang::Expr const*>, clang::NamedDecl*, llvm::MutableArrayRef<clang::Expr const*>, bool&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x69f4a74)
#16 0x000000000732de19 clang::ClassTemplatePartialSpecializationDecl* getMoreSpecialized<clang::ClassTemplatePartialSpecializationDecl, clang::ClassTemplateDecl>(clang::Sema&, clang::QualType, clang::QualType, clang::ClassTemplatePartialSpecializationDecl*, clang::ClassTemplateDecl*, clang::sema::TemplateDeductionInfo&) SemaTemplateDeduction.cpp:0:0
#17 0x000000000732e009 clang::Sema::isMoreSpecializedThanPrimary(clang::ClassTemplatePartialSpecializationDecl*, clang::sema::TemplateDeductionInfo&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x732e009)
#18 0x00000000072516a4 void checkTemplatePartialSpecialization<clang::ClassTemplatePartialSpecializationDecl>(clang::Sema&, clang::ClassTemplatePartialSpecializationDecl*) SemaTemplate.cpp:0:0
#19 0x00000000072e9039 clang::Sema::ActOnClassTemplateSpecialization(clang::Scope*, unsigned int, clang::TagUseKind, clang::SourceLocation, clang::SourceLocation, clang::CXXScopeSpec&, clang::TemplateIdAnnotation&, clang::ParsedAttributesView const&, llvm::MutableArrayRef<clang::TemplateParameterList*>, clang::SkipBodyInfo*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x72e9039)
#20 0x0000000006755fb3 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-assertions-trunk/bin/clang+++0x6755fb3)
#21 0x000000000672bb70 clang::Parser::ParseDeclarationSpecifiers(clang::DeclSpec&, clang::Parser::ParsedTemplateInfo&, clang::AccessSpecifier, clang::Parser::DeclSpecContext, clang::Parser::LateParsedAttrList*, clang::ImplicitTypenameContext) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x672bb70)
#22 0x00000000067f361a clang::Parser::ParseDeclarationAfterTemplate(clang::DeclaratorContext, clang::Parser::ParsedTemplateInfo&, clang::ParsingDeclRAIIObject&, clang::SourceLocation&, clang::ParsedAttributes&, clang::AccessSpecifier) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x67f361a)
#23 0x0000000006800f3c clang::Parser::ParseTemplateDeclarationOrSpecialization(clang::DeclaratorContext, clang::SourceLocation&, clang::ParsedAttributes&, clang::AccessSpecifier) (.part.0) ParseTemplate.cpp:0:0
#24 0x000000000680125a clang::Parser::ParseDeclarationStartingWithTemplate(clang::DeclaratorContext, clang::SourceLocation&, clang::ParsedAttributes&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x680125a)
#25 0x0000000006732863 clang::Parser::ParseDeclaration(clang::DeclaratorContext, clang::SourceLocation&, clang::ParsedAttributes&, clang::ParsedAttributes&, clang::SourceLocation*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6732863)
#26 0x00000000066f1897 clang::Parser::ParseExternalDeclaration(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x66f1897)
#27 0x00000000066f273d clang::Parser::ParseTopLevelDecl(clang::OpaquePtr<clang::DeclGroupRef>&, clang::Sema::ModuleImportState&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x66f273d)
#28 0x00000000066e4c5a clang::ParseAST(clang::Sema&, bool, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x66e4c5a)
#29 0x0000000004563b58 clang::CodeGenAction::ExecuteAction() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4563b58)
#30 0x000000000481e689 clang::FrontendAction::Execute() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x481e689)
#31 0x000000000479d8fe clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x479d8fe)
#32 0x000000000490441e clang::ExecuteCompilerInvocation(clang::CompilerInstance*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x490441e)
#33 0x0000000000ce624f cc1_main(llvm::ArrayRef<char const*>, char const*, void*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xce624f)
#34 0x0000000000cddf0a ExecuteCC1Tool(llvm::SmallVectorImpl<char const*>&, llvm::ToolContext const&) driver.cpp:0:0
#35 0x00000000045a6cb9 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
#36 0x0000000003b35914 llvm::CrashRecoveryContext::RunSafely(llvm::function_ref<void ()>) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x3b35914)
#37 0x00000000045a72af 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
#38 0x000000000456d63d clang::driver::Compilation::ExecuteCommand(clang::driver::Command const&, clang::driver::Command const*&, bool) const (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x456d63d)
#39 0x000000000456e72d 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+++0x456e72d)
#40 0x0000000004575ae5 clang::driver::Driver::ExecuteCompilation(clang::driver::Compilation&, llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*>>&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4575ae5)
#41 0x0000000000ce30e9 clang_main(int, char**, llvm::ToolContext const&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xce30e9)
#42 0x0000000000bb0284 main (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xbb0284)
#43 0x00007759bfe29d90 (/lib/x86_64-linux-gnu/libc.so.6+0x29d90)
#44 0x00007759bfe29e40 __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x29e40)
#45 0x0000000000cdd9be _start (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xcdd9be)
clang++: error: clang frontend command failed with exit code 134 (use -v to see invocation)
Compiler returned: 134