| Issue |
177741
|
| Summary |
[Clang] Assertion error in getParamDecl() starting from clang-20
|
| Labels |
clang
|
| Assignees |
|
| Reporter |
hax0kartik
|
Hi, while playing around with the testcase for #176639, I've noticed that there is a separate assertion error when the `static` keyword is involved.
Reproducer: [https://godbolt.org/z/8oETxqYzd](https://godbolt.org/z/8oETxqYzd)
Assertion:
```
/root/llvm-project/llvm/tools/clang/include/clang/AST/Decl.h:2802: clang::ParmVarDecl* clang::FunctionDecl::getParamDecl(unsigned int): Assertion `i < getNumParams() && "Illegal param #"' 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: /cefs/37/37fa0666bafd90121a73c22e_clang-assertions-trunk-20260124/bin/clang-23 -cc1 -triple x86_64-unknown-linux-gnu -emit-obj -dumpdir /app/output.s- -disable-free -clear-ast-before-backend -main-file-name example.cpp -mrelocation-model pic -pic-level 2 -pic-is-pie -mframe-pointer=all -fmath-errno -ffp-contract=on -fno-rounding-math -fno-verbose-asm -mconstructor-aliases -funwind-tables=2 -target-cpu x86-64 -tune-cpu generic -debug-info-kind=constructor -dwarf-version=5 -debugger-tuning=gdb -fdebug-compilation-dir=/app -fcoverage-compilation-dir=/app -resource-dir /cefs/37/37fa0666bafd90121a73c22e_clang-assertions-trunk-20260124/lib/clang/23 -internal-isystem /opt/compiler-explorer/gcc-snapshot/lib/gcc/x86_64-linux-gnu/16.0.1/../../../../include/c++/16.0.1 -internal-isystem /opt/compiler-explorer/gcc-snapshot/lib/gcc/x86_64-linux-gnu/16.0.1/../../../../include/c++/16.0.1/x86_64-linux-gnu -internal-isystem /opt/compiler-explorer/gcc-snapshot/lib/gcc/x86_64-linux-gnu/16.0.1/../../../../include/c++/16.0.1/backward -internal-isystem /cefs/37/37fa0666bafd90121a73c22e_clang-assertions-trunk-20260124/lib/clang/23/include -internal-isystem /usr/local/include -internal-isystem /opt/compiler-explorer/gcc-snapshot/lib/gcc/x86_64-linux-gnu/16.0.1/../../../../x86_64-linux-gnu/include -internal-externc-isystem /usr/include/x86_64-linux-gnu -internal-externc-isystem /include -internal-externc-isystem /usr/include -std=c++23 -fdeprecated-macro -ferror-limit 19 -fgnuc-version=4.2.1 -fno-implicit-modules -fskip-odr-check-in-gmf -fcxx-exceptions -fexceptions -fcolor-diagnostics -faddrsig -fdwarf2-cfi-asm -o /tmp/example-eb83e9.o -x c++ <source>
1. <source>:10:6: current parser token ')'
2. <source>:8:12: parsing function body 'foo'
3. <source>:8:12: in compound statement ('{}'
```
Backtrace:
```
#0 0x0000000004309af8 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/cefs/37/37fa0666bafd90121a73c22e_clang-assertions-trunk-20260124/bin/clang-23+0x4309af8)
#1 0x00000000043069d4 SignalHandler(int, siginfo_t*, void*) Signals.cpp:0:0
#2 0x0000788e6a642520 (/lib/x86_64-linux-gnu/libc.so.6+0x42520)
#3 0x0000788e6a6969fc pthread_kill (/lib/x86_64-linux-gnu/libc.so.6+0x969fc)
#4 0x0000788e6a642476 gsignal (/lib/x86_64-linux-gnu/libc.so.6+0x42476)
#5 0x0000788e6a6287f3 abort (/lib/x86_64-linux-gnu/libc.so.6+0x287f3)
#6 0x0000788e6a62871b (/lib/x86_64-linux-gnu/libc.so.6+0x2871b)
#7 0x0000788e6a639e96 (/lib/x86_64-linux-gnu/libc.so.6+0x39e96)
#8 0x0000000006caafa2 (/cefs/37/37fa0666bafd90121a73c22e_clang-assertions-trunk-20260124/bin/clang-23+0x6caafa2)
#9 0x0000000007365abb DiagnoseBadConversion(clang::Sema&, clang::OverloadCandidate*, unsigned int, bool) SemaOverload.cpp:0:0
#10 0x0000000007392420 clang::OverloadCandidateSet::NoteCandidates(clang::Sema&, llvm::ArrayRef<clang::Expr*>, llvm::ArrayRef<clang::OverloadCandidate*>, llvm::StringRef, clang::SourceLocation) (/cefs/37/37fa0666bafd90121a73c22e_clang-assertions-trunk-20260124/bin/clang-23+0x7392420)
#11 0x0000000007392e81 clang::OverloadCandidateSet::NoteCandidates(std::pair<clang::SourceLocation, clang::PartialDiagnostic>, clang::Sema&, clang::OverloadCandidateDisplayKind, llvm::ArrayRef<clang::Expr*>, llvm::StringRef, clang::SourceLocation, llvm::function_ref<bool (clang::OverloadCandidate&)>) (/cefs/37/37fa0666bafd90121a73c22e_clang-assertions-trunk-20260124/bin/clang-23+0x7392e81)
#12 0x000000000739ec7b clang::Sema::BuildCallToObjectOfClassType(clang::Scope*, clang::Expr*, clang::SourceLocation, llvm::MutableArrayRef<clang::Expr*>, clang::SourceLocation) (/cefs/37/37fa0666bafd90121a73c22e_clang-assertions-trunk-20260124/bin/clang-23+0x739ec7b)
#13 0x0000000006ff6604 clang::Sema::BuildCallExpr(clang::Scope*, clang::Expr*, clang::SourceLocation, llvm::MutableArrayRef<clang::Expr*>, clang::SourceLocation, clang::Expr*, bool, bool) (/cefs/37/37fa0666bafd90121a73c22e_clang-assertions-trunk-20260124/bin/clang-23+0x6ff6604)
#14 0x0000000006ffb55c clang::Sema::ActOnCallExpr(clang::Scope*, clang::Expr*, clang::SourceLocation, llvm::MutableArrayRef<clang::Expr*>, clang::SourceLocation, clang::Expr*) (/cefs/37/37fa0666bafd90121a73c22e_clang-assertions-trunk-20260124/bin/clang-23+0x6ffb55c)
#15 0x0000000006af9737 clang::Parser::ParsePostfixExpressionSuffix(clang::ActionResult<clang::Expr*, true>) (/cefs/37/37fa0666bafd90121a73c22e_clang-assertions-trunk-20260124/bin/clang-23+0x6af9737)
#16 0x0000000006af264a clang::Parser::ParseCastExpression(clang::CastParseKind, bool, bool&, clang::TypoCorrectionTypeBehavior, bool, bool*) (/cefs/37/37fa0666bafd90121a73c22e_clang-assertions-trunk-20260124/bin/clang-23+0x6af264a)
#17 0x0000000006af48a7 clang::Parser::ParseCastExpression(clang::CastParseKind, bool, clang::TypoCorrectionTypeBehavior, bool, bool*) (/cefs/37/37fa0666bafd90121a73c22e_clang-assertions-trunk-20260124/bin/clang-23+0x6af48a7)
#18 0x0000000006af4939 clang::Parser::ParseAssignmentExpression(clang::TypoCorrectionTypeBehavior) (/cefs/37/37fa0666bafd90121a73c22e_clang-assertions-trunk-20260124/bin/clang-23+0x6af4939)
#19 0x0000000006af8f19 clang::Parser::ParseExpression(clang::TypoCorrectionTypeBehavior) (/cefs/37/37fa0666bafd90121a73c22e_clang-assertions-trunk-20260124/bin/clang-23+0x6af8f19)
#20 0x0000000006b7f439 clang::Parser::ParseExprStatement(clang::Parser::ParsedStmtContext) (/cefs/37/37fa0666bafd90121a73c22e_clang-assertions-trunk-20260124/bin/clang-23+0x6b7f439)
#21 0x0000000006b768e2 clang::Parser::ParseStatementOrDeclarationAfterAttributes(llvm::SmallVector<clang::Stmt*, 24u>&, clang::Parser::ParsedStmtContext, clang::SourceLocation*, clang::ParsedAttributes&, clang::ParsedAttributes&, clang::LabelDecl*) (/cefs/37/37fa0666bafd90121a73c22e_clang-assertions-trunk-20260124/bin/clang-23+0x6b768e2)
#22 0x0000000006b772c6 clang::Parser::ParseStatementOrDeclaration(llvm::SmallVector<clang::Stmt*, 24u>&, clang::Parser::ParsedStmtContext, clang::SourceLocation*, clang::LabelDecl*) (/cefs/37/37fa0666bafd90121a73c22e_clang-assertions-trunk-20260124/bin/clang-23+0x6b772c6)
#23 0x0000000006b7fbb6 clang::Parser::ParseCompoundStatementBody(bool) (/cefs/37/37fa0666bafd90121a73c22e_clang-assertions-trunk-20260124/bin/clang-23+0x6b7fbb6)
#24 0x0000000006b803ca clang::Parser::ParseFunctionStatementBody(clang::Decl*, clang::Parser::ParseScope&) (/cefs/37/37fa0666bafd90121a73c22e_clang-assertions-trunk-20260124/bin/clang-23+0x6b803ca)
#25 0x0000000006a85c0b clang::Parser::ParseFunctionDefinition(clang::ParsingDeclarator&, clang::Parser::ParsedTemplateInfo const&, clang::Parser::LateParsedAttrList*) (/cefs/37/37fa0666bafd90121a73c22e_clang-assertions-trunk-20260124/bin/clang-23+0x6a85c0b)
#26 0x0000000006abc07d clang::Parser::ParseDeclGroup(clang::ParsingDeclSpec&, clang::DeclaratorContext, clang::ParsedAttributes&, clang::Parser::ParsedTemplateInfo&, clang::SourceLocation*, clang::Parser::ForRangeInit*) (/cefs/37/37fa0666bafd90121a73c22e_clang-assertions-trunk-20260124/bin/clang-23+0x6abc07d)
#27 0x0000000006a78cdb clang::Parser::ParseDeclOrFunctionDefInternal(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec&, clang::AccessSpecifier) (/cefs/37/37fa0666bafd90121a73c22e_clang-assertions-trunk-20260124/bin/clang-23+0x6a78cdb)
#28 0x0000000006a794cf clang::Parser::ParseDeclarationOrFunctionDefinition(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec*, clang::AccessSpecifier) (/cefs/37/37fa0666bafd90121a73c22e_clang-assertions-trunk-20260124/bin/clang-23+0x6a794cf)
#29 0x0000000006a814d1 clang::Parser::ParseExternalDeclaration(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec*) (/cefs/37/37fa0666bafd90121a73c22e_clang-assertions-trunk-20260124/bin/clang-23+0x6a814d1)
#30 0x0000000006a823e5 clang::Parser::ParseTopLevelDecl(clang::OpaquePtr<clang::DeclGroupRef>&, clang::Sema::ModuleImportState&) (/cefs/37/37fa0666bafd90121a73c22e_clang-assertions-trunk-20260124/bin/clang-23+0x6a823e5)
#31 0x0000000006a630fa clang::ParseAST(clang::Sema&, bool, bool) (/cefs/37/37fa0666bafd90121a73c22e_clang-assertions-trunk-20260124/bin/clang-23+0x6a630fa)
#32 0x0000000004c731e8 clang::CodeGenAction::ExecuteAction() (/cefs/37/37fa0666bafd90121a73c22e_clang-assertions-trunk-20260124/bin/clang-23+0x4c731e8)
#33 0x0000000004f6e525 clang::FrontendAction::Execute() (/cefs/37/37fa0666bafd90121a73c22e_clang-assertions-trunk-20260124/bin/clang-23+0x4f6e525)
#34 0x0000000004eedf4e clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) (/cefs/37/37fa0666bafd90121a73c22e_clang-assertions-trunk-20260124/bin/clang-23+0x4eedf4e)
#35 0x00000000050696ed clang::ExecuteCompilerInvocation(clang::CompilerInstance*) (/cefs/37/37fa0666bafd90121a73c22e_clang-assertions-trunk-20260124/bin/clang-23+0x50696ed)
#36 0x0000000000ddd95e cc1_main(llvm::ArrayRef<char const*>, char const*, void*) (/cefs/37/37fa0666bafd90121a73c22e_clang-assertions-trunk-20260124/bin/clang-23+0xddd95e)
#37 0x0000000000dd432a ExecuteCC1Tool(llvm::SmallVectorImpl<char const*>&, llvm::ToolContext const&, llvm::IntrusiveRefCntPtr<llvm::vfs::FileSystem>) driver.cpp:0:0
#38 0x0000000000dd8738 clang_main(int, char**, llvm::ToolContext const&) (/cefs/37/37fa0666bafd90121a73c22e_clang-assertions-trunk-20260124/bin/clang-23+0xdd8738)
#39 0x0000000000c96d24 main (/cefs/37/37fa0666bafd90121a73c22e_clang-assertions-trunk-20260124/bin/clang-23+0xc96d24)
#40 0x0000788e6a629d90 (/lib/x86_64-linux-gnu/libc.so.6+0x29d90)
#41 0x0000788e6a629e40 __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x29e40)
#42 0x0000000000dd3dc5 _start (/cefs/37/37fa0666bafd90121a73c22e_clang-assertions-trunk-20260124/bin/clang-23+0xdd3dc5)
clang++: error: unable to execute command: Aborted (core dumped)
clang++: error: clang frontend command failed due to signal (use -v to see invocation)
```
Goes back to `clang 20.1.0`
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