Open
Description
Probably goes back to clang-6: https://godbolt.org/z/4hW6eTWxb
Generated by fuzzer.
Reduced Test:
template<int>
struct base
{
union MyUnion {
struct NonTrivial {
NonTrivial() { /* Perform some operation */ }
} member;
} u;
base() = default;
};
struct foo : base<1>, base<2>
{
constexpr foo() : base<2>{}{}
constexpr foo(int a) : base<2>{a}{}
};It's interesting that if constexpr foo() or constexpr foo(int a) is commented out, the assertion won't be triggered until clang-14: https://godbolt.org/z/1G39fnYMv
Stack Dump:
clang++: /root/llvm-project/llvm/tools/clang/lib/AST/ExprConstant.cpp:6815: bool HandleConstructorCall(const clang::Expr*, const {anonymous}::LValue&, {anonymous}::CallRef, const clang::CXXConstructorDecl*, {anonymous}::EvalInfo&, clang::APValue&): Assertion `Info.Ctx.hasSameUnqualifiedType(BaseIt->getType(), BaseType) && "base class initializers not in expected order"' 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 <source>
1. <eof> parser at end of file
2. <source>:12:1: parsing struct/union/class body 'foo'
3. <source>:15:36: parsing function body 'foo::foo'
#0 0x0000000003f7e5c8 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x3f7e5c8)
#1 0x0000000003f7b9f4 llvm::sys::CleanupOnSignal(unsigned long) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x3f7b9f4)
#2 0x0000000003ec0318 CrashRecoverySignalHandler(int) CrashRecoveryContext.cpp:0:0
#3 0x0000784920e42520 (/lib/x86_64-linux-gnu/libc.so.6+0x42520)
#4 0x0000784920e969fc pthread_kill (/lib/x86_64-linux-gnu/libc.so.6+0x969fc)
#5 0x0000784920e42476 gsignal (/lib/x86_64-linux-gnu/libc.so.6+0x42476)
#6 0x0000784920e287f3 abort (/lib/x86_64-linux-gnu/libc.so.6+0x287f3)
#7 0x0000784920e2871b (/lib/x86_64-linux-gnu/libc.so.6+0x2871b)
#8 0x0000784920e39e96 (/lib/x86_64-linux-gnu/libc.so.6+0x39e96)
#9 0x0000000007886402 (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x7886402)
#10 0x000000000788654f HandleConstructorCall(clang::Expr const*, (anonymous namespace)::LValue const&, llvm::ArrayRef<clang::Expr const*>, clang::CXXConstructorDecl const*, (anonymous namespace)::EvalInfo&, clang::APValue&) ExprConstant.cpp:0:0
#11 0x00000000078cd11a clang::Expr::isPotentialConstantExpr(clang::FunctionDecl const*, llvm::SmallVectorImpl<std::pair<clang::SourceLocation, clang::PartialDiagnostic>>&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x78cd11a)
#12 0x0000000006a7a916 clang::Sema::CheckConstexprFunctionDefinition(clang::FunctionDecl const*, clang::Sema::CheckConstexprKind) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6a7a916)
#13 0x00000000069ffaa3 clang::Sema::ActOnFinishFunctionBody(clang::Decl*, clang::Stmt*, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x69ffaa3)
#14 0x0000000006746c4f clang::Parser::ParseFunctionStatementBody(clang::Decl*, clang::Parser::ParseScope&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6746c4f)
#15 0x000000000664dcd0 clang::Parser::ParseLexedMethodDef(clang::Parser::LexedMethod&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x664dcd0)
#16 0x000000000664d9bd clang::Parser::ParseLexedMethodDefs(clang::Parser::ParsingClass&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x664d9bd)
#17 0x00000000066a09d9 clang::Parser::ParseCXXMemberSpecification(clang::SourceLocation, clang::SourceLocation, clang::ParsedAttributes&, unsigned int, clang::Decl*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x66a09d9)
#18 0x00000000066a3790 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+++0x66a3790)
#19 0x00000000066770f0 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+++0x66770f0)
#20 0x0000000006633114 clang::Parser::ParseDeclOrFunctionDefInternal(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec&, clang::AccessSpecifier) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6633114)
#21 0x0000000006633b29 clang::Parser::ParseDeclarationOrFunctionDefinition(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec*, clang::AccessSpecifier) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6633b29)
#22 0x00000000066390e3 clang::Parser::ParseExternalDeclaration(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x66390e3)
#23 0x000000000663a55f clang::Parser::ParseTopLevelDecl(clang::OpaquePtr<clang::DeclGroupRef>&, clang::Sema::ModuleImportState&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x663a55f)
#24 0x000000000662e62a clang::ParseAST(clang::Sema&, bool, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x662e62a)
#25 0x00000000049360f8 clang::CodeGenAction::ExecuteAction() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x49360f8)
#26 0x0000000004c2fff5 clang::FrontendAction::Execute() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4c2fff5)
#27 0x0000000004bacb9e clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4bacb9e)
#28 0x0000000004d22941 clang::ExecuteCompilerInvocation(clang::CompilerInstance*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4d22941)
#29 0x0000000000d908af cc1_main(llvm::ArrayRef<char const*>, char const*, void*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xd908af)
#30 0x0000000000d8748a ExecuteCC1Tool(llvm::SmallVectorImpl<char const*>&, llvm::ToolContext const&) driver.cpp:0:0
#31 0x000000000499cca9 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
#32 0x0000000003ec07b4 llvm::CrashRecoveryContext::RunSafely(llvm::function_ref<void ()>) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x3ec07b4)
#33 0x000000000499d2bf 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
#34 0x000000000495f28d clang::driver::Compilation::ExecuteCommand(clang::driver::Command const&, clang::driver::Command const*&, bool) const (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x495f28d)
#35 0x000000000496031e 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+++0x496031e)
#36 0x0000000004968eb5 clang::driver::Driver::ExecuteCompilation(clang::driver::Compilation&, llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*>>&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4968eb5)
#37 0x0000000000d8cd5f clang_main(int, char**, llvm::ToolContext const&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xd8cd5f)
#38 0x0000000000c422e4 main (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xc422e4)
#39 0x0000784920e29d90 (/lib/x86_64-linux-gnu/libc.so.6+0x29d90)
#40 0x0000784920e29e40 __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x29e40)
#41 0x0000000000d86f35 _start (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xd86f35)
clang++: error: clang frontend command failed with exit code 134 (use -v to see invocation)