llvmbot
commented
2 weeks ago @llvm/issue-subscribers-clang-frontend
Author: Yihan Yang (yijan4845)
**This testcase is generated by a fuzzer.**
Compiler Explorer: [https://godbolt.org/z/azj49bxWW](https://godbolt.org/z/azj49bxWW)
This invalid code will crash on Clang Assertion Trunk.
```cpp
struct s {
int i = 0;
int j = 0;
void m(int i = ^{ static int i = 0; return ++i; }(),
int j = ^{ #line 7
static int i = 0; return ++i; }()) {}
};
```
It seems that this goes back to clang-17. The stack dump is very similar to [112632](https://github.com/llvm/llvm-project/issues/112632).
Stack dump:
```
clang++: /root/llvm-project/llvm/include/llvm/ADT/SmallVector.h:291: T& llvm::SmallVectorTemplateCommon<T, <template-parameter-1-2> >::operator[](llvm::SmallVectorTemplateCommon<T, <template-parameter-1-2> >::size_type) [with T = clang::sema::FunctionScopeInfo*; <template-parameter-1-2> = void; llvm::SmallVectorTemplateCommon<T, <template-parameter-1-2> >::reference = clang::sema::FunctionScopeInfo*&; llvm::SmallVectorTemplateCommon<T, <template-parameter-1-2> >::size_type = long unsigned int]: Assertion `idx < size()' 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. <source>:6:38: current parser token ';'
2. <source>:1:1: parsing struct/union/class body 's'
3. <source>:5:18: block literal parsing
4. <source>:5:19: in compound statement ('{}')
#0 0x0000000003bf66c8 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x3bf66c8)
#1 0x0000000003bf43cc llvm::sys::CleanupOnSignal(unsigned long) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x3bf43cc)
#2 0x0000000003b419c8 CrashRecoverySignalHandler(int) CrashRecoveryContext.cpp:0:0
#3 0x00007e05baa42520 (/lib/x86_64-linux-gnu/libc.so.6+0x42520)
#4 0x00007e05baa969fc pthread_kill (/lib/x86_64-linux-gnu/libc.so.6+0x969fc)
#5 0x00007e05baa42476 gsignal (/lib/x86_64-linux-gnu/libc.so.6+0x42476)
#6 0x00007e05baa287f3 abort (/lib/x86_64-linux-gnu/libc.so.6+0x287f3)
#7 0x00007e05baa2871b (/lib/x86_64-linux-gnu/libc.so.6+0x2871b)
#8 0x00007e05baa39e96 (/lib/x86_64-linux-gnu/libc.so.6+0x39e96)
#9 0x0000000006cce9aa clang::Sema::tryCaptureVariable(clang::ValueDecl*, clang::SourceLocation, clang::Sema::TryCaptureKind, clang::SourceLocation, bool, clang::QualType&, clang::QualType&, unsigned int const*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6cce9aa)
#10 0x0000000006cceed1 clang::Sema::getCapturedDeclRefType(clang::ValueDecl*, clang::SourceLocation) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6cceed1)
#11 0x0000000006d0eef2 clang::Sema::BuildDeclarationNameExpr(clang::CXXScopeSpec const&, clang::DeclarationNameInfo const&, clang::NamedDecl*, clang::NamedDecl*, clang::TemplateArgumentListInfo const*, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6d0eef2)
#12 0x0000000006d0f28f clang::Sema::BuildDeclarationNameExpr(clang::CXXScopeSpec const&, clang::LookupResult&, bool, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6d0f28f)
#13 0x0000000006d11096 clang::Sema::ActOnIdExpression(clang::Scope*, clang::CXXScopeSpec&, clang::SourceLocation, clang::UnqualifiedId&, bool, bool, clang::CorrectionCandidateCallback*, bool, clang::Token*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6d11096)
#14 0x00000000067940c7 clang::Parser::ParseCastExpression(clang::Parser::CastParseKind, bool, bool&, clang::Parser::TypeCastState, bool, bool*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x67940c7)
#15 0x00000000067933a5 clang::Parser::ParseCastExpression(clang::Parser::CastParseKind, bool, bool&, clang::Parser::TypeCastState, bool, bool*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x67933a5)
#16 0x0000000006794df7 clang::Parser::ParseCastExpression(clang::Parser::CastParseKind, bool, clang::Parser::TypeCastState, bool, bool*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6794df7)
#17 0x0000000006794e89 clang::Parser::ParseAssignmentExpression(clang::Parser::TypeCastState) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6794e89)
#18 0x00000000067998a9 clang::Parser::ParseExpression(clang::Parser::TypeCastState) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x67998a9)
#19 0x000000000680ebf2 clang::Parser::ParseReturnStatement() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x680ebf2)
#20 0x0000000006811df5 clang::Parser::ParseStatementOrDeclarationAfterAttributes(llvm::SmallVector<clang::Stmt*, 32u>&, clang::Parser::ParsedStmtContext, clang::SourceLocation*, clang::ParsedAttributes&, clang::ParsedAttributes&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6811df5)
#21 0x0000000006813520 clang::Parser::ParseStatementOrDeclaration(llvm::SmallVector<clang::Stmt*, 32u>&, clang::Parser::ParsedStmtContext, clang::SourceLocation*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6813520)
#22 0x00000000068143e4 clang::Parser::ParseCompoundStatementBody(bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x68143e4)
#23 0x000000000678f67a clang::Parser::ParseBlockLiteralExpression() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x678f67a)
#24 0x000000000679379a clang::Parser::ParseCastExpression(clang::Parser::CastParseKind, bool, bool&, clang::Parser::TypeCastState, bool, bool*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x679379a)
#25 0x0000000006794df7 clang::Parser::ParseCastExpression(clang::Parser::CastParseKind, bool, clang::Parser::TypeCastState, bool, bool*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6794df7)
#26 0x0000000006794e89 clang::Parser::ParseAssignmentExpression(clang::Parser::TypeCastState) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6794e89)
#27 0x0000000006742038 clang::Parser::ParseLexedMethodDeclaration(clang::Parser::LateParsedMethodDeclaration&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6742038)
#28 0x00000000067373dd clang::Parser::ParseLexedMethodDeclarations(clang::Parser::ParsingClass&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x67373dd)
#29 0x0000000006788c5f clang::Parser::ParseCXXMemberSpecification(clang::SourceLocation, clang::SourceLocation, clang::ParsedAttributes&, unsigned int, clang::Decl*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6788c5f)
#30 0x000000000678b2b3 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+++0x678b2b3)
#31 0x000000000675fab0 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+++0x675fab0)
#32 0x000000000671d584 clang::Parser::ParseDeclOrFunctionDefInternal(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec&, clang::AccessSpecifier) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x671d584)
#33 0x000000000671dfee clang::Parser::ParseDeclarationOrFunctionDefinition(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec*, clang::AccessSpecifier) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x671dfee)
#34 0x0000000006725783 clang::Parser::ParseExternalDeclaration(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6725783)
#35 0x000000000672666d clang::Parser::ParseTopLevelDecl(clang::OpaquePtr<clang::DeclGroupRef>&, clang::Sema::ModuleImportState&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x672666d)
#36 0x0000000006726b10 clang::Parser::ParseFirstTopLevelDecl(clang::OpaquePtr<clang::DeclGroupRef>&, clang::Sema::ModuleImportState&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6726b10)
#37 0x0000000006718b52 clang::ParseAST(clang::Sema&, bool, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6718b52)
#38 0x00000000045725c8 clang::CodeGenAction::ExecuteAction() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x45725c8)
#39 0x000000000482d559 clang::FrontendAction::Execute() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x482d559)
#40 0x00000000047ac7ce clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x47ac7ce)
#41 0x000000000491335e clang::ExecuteCompilerInvocation(clang::CompilerInstance*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x491335e)
#42 0x0000000000ce9aff cc1_main(llvm::ArrayRef<char const*>, char const*, void*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xce9aff)
#43 0x0000000000ce17ba ExecuteCC1Tool(llvm::SmallVectorImpl<char const*>&, llvm::ToolContext const&) driver.cpp:0:0
#44 0x00000000045b57c9 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
#45 0x0000000003b41e74 llvm::CrashRecoveryContext::RunSafely(llvm::function_ref<void ()>) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x3b41e74)
#46 0x00000000045b5dbf 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
#47 0x000000000457c0ad clang::driver::Compilation::ExecuteCommand(clang::driver::Command const&, clang::driver::Command const*&, bool) const (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x457c0ad)
#48 0x000000000457d19d 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+++0x457d19d)
#49 0x0000000004584555 clang::driver::Driver::ExecuteCompilation(clang::driver::Compilation&, llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*>>&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4584555)
#50 0x0000000000ce6999 clang_main(int, char**, llvm::ToolContext const&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xce6999)
#51 0x0000000000bb3494 main (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xbb3494)
#52 0x00007e05baa29d90 (/lib/x86_64-linux-gnu/libc.so.6+0x29d90)
#53 0x00007e05baa29e40 __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x29e40)
#54 0x0000000000ce126e _start (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xce126e)
clang++: error: clang frontend command failed with exit code 134 (use -v to see invocation)
Compiler returned: 134
```
shafik
This testcase is generated by a fuzzer.
Compiler Explorer: https://godbolt.org/z/azj49bxWW
This invalid code will crash on Clang Assertion Trunk.
It seems that this goes back to clang-17. The stack dump is very similar to 112632.
Stack dump: