| Issue |
137845
|
| Summary |
Clang 21 crashes when compiling invalid initializer in C (struct array literal cast)
|
| Labels |
clang
|
| Assignees |
|
| Reporter |
mariete1223
|
## Summary
Clang 21 crashes with a stack dump when compiling a small invalid C program involving a struct array literal being cast and passed as an argument.
## Stack Trace
```
Stack dump:
0. Program arguments: /usr/local/bin/clang-21 -cc1 -triple x86_64-unknown-linux-gnu -emit-obj -dumpdir a- -disable-free -clear-ast-before-backend -disable-llvm-verifier -discard-value-names -main-file-name prueba.cpp -mrelocation-model pic -pic-level 2 -pic-is-pie -mframe-pointer=all -fmath-errno -ffp-contract=on -fno-rounding-math -mconstructor-aliases -funwind-tables=2 -target-cpu x86-64 -tune-cpu generic -debugger-tuning=gdb -fdebug-compilation-dir=/root -fcoverage-compilation-dir=/root -resource-dir /usr/local/lib/clang/21 -internal-isystem /usr/local/lib/clang/21/include -internal-isystem /usr/local/include -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/9/../../../../x86_64-linux-gnu/include -internal-externc-isystem /usr/include/x86_64-linux-gnu -internal-externc-isystem /include -internal-externc-isystem /usr/include -std=c2x -ferror-limit 19 -fgnuc-version=4.2.1 -fskip-odr-check-in-gmf -fcolor-diagnostics -faddrsig -D__GCC_HAVE_DWARF2_CFI_ASM=1 -o /tmp/prueba-cf6791.o -x c prueba.cpp
1. prueba.cpp:7:49: current parser token ')'
2. prueba.cpp:5:11: parsing function body 'main'
3. prueba.cpp:5:11: in compound statement ('{}')
#0 0x000055fee950018f llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/usr/local/bin/clang-21+0x3c4a18f)
#1 0x000055fee94fdbd4 SignalHandler(int, siginfo_t*, void*) Signals.cpp:0:0
#2 0x00007f5adbc08420 __restore_rt (/lib/x86_64-linux-gnu/libpthread.so.0+0x14420)
#3 0x000055feebe06b44 (anonymous namespace)::InitListChecker::CheckExplicitInitList(clang::InitializedEntity const&, clang::InitListExpr*, clang::QualType&, clang::InitListExpr*, bool) (.constprop.0) SemaInit.cpp:0:0
#4 0x000055feebe07217 (anonymous namespace)::InitListChecker::InitListChecker(clang::Sema&, clang::InitializedEntity const&, clang::InitListExpr*, clang::QualType&, bool, bool, bool, llvm::SmallVectorImpl<clang::QualType>*) SemaInit.cpp:0:0
#5 0x000055feebe08f23 clang::InitializationSequence::Perform(clang::Sema&, clang::InitializedEntity const&, clang::InitializationKind const&, llvm::MutableArrayRef<clang::Expr*>, clang::QualType*) (/usr/local/bin/clang-21+0x6552f23)
#6 0x000055feebe1355e clang::Sema::PerformCopyInitialization(clang::InitializedEntity const&, clang::SourceLocation, clang::ActionResult<clang::Expr*, true>, bool, bool) (/usr/local/bin/clang-21+0x655d55e)
#7 0x000055feebc70d36 clang::Sema::GatherArgumentsForCall(clang::SourceLocation, clang::FunctionDecl*, clang::FunctionProtoType const*, unsigned int, llvm::ArrayRef<clang::Expr*>, llvm::SmallVectorImpl<clang::Expr*>&, clang::Sema::VariadicCallType, bool, bool) (/usr/local/bin/clang-21+0x63bad36)
#8 0x000055feebc718af clang::Sema::ConvertArgumentsForCall(clang::CallExpr*, clang::Expr*, clang::FunctionDecl*, clang::FunctionProtoType const*, llvm::ArrayRef<clang::Expr*>, clang::SourceLocation, bool) (/usr/local/bin/clang-21+0x63bb8af)
#9 0x000055feebc73760 clang::Sema::BuildResolvedCallExpr(clang::Expr*, clang::NamedDecl*, clang::SourceLocation, llvm::ArrayRef<clang::Expr*>, clang::SourceLocation, clang::Expr*, bool, clang::CallExpr::ADLCallKind) (/usr/local/bin/clang-21+0x63bd760)
#10 0x000055feebc6f052 clang::Sema::BuildCallExpr(clang::Scope*, clang::Expr*, clang::SourceLocation, llvm::MutableArrayRef<clang::Expr*>, clang::SourceLocation, clang::Expr*, bool, bool) (/usr/local/bin/clang-21+0x63b9052)
#11 0x000055feebc7456b clang::Sema::ActOnCallExpr(clang::Scope*, clang::Expr*, clang::SourceLocation, llvm::MutableArrayRef<clang::Expr*>, clang::SourceLocation, clang::Expr*) (/usr/local/bin/clang-21+0x63be56b)
#12 0x000055feeb7a6a10 clang::Parser::ParsePostfixExpressionSuffix(clang::ActionResult<clang::Expr*, true>) (/usr/local/bin/clang-21+0x5ef0a10)
#13 0x000055feeb79e5a7 clang::Parser::ParseCastExpression(clang::Parser::CastParseKind, bool, bool&, clang::Parser::TypeCastState, bool, bool*) (/usr/local/bin/clang-21+0x5ee85a7)
#14 0x000055feeb7a072e clang::Parser::ParseCastExpression(clang::Parser::CastParseKind, bool, clang::Parser::TypeCastState, bool, bool*) (/usr/local/bin/clang-21+0x5eea72e)
#15 0x000055feeb7a092d clang::Parser::ParseAssignmentExpression(clang::Parser::TypeCastState) (/usr/local/bin/clang-21+0x5eea92d)
#16 0x000055feeb7a0d42 clang::Parser::ParseExpressionList(llvm::SmallVectorImpl<clang::Expr*>&, llvm::function_ref<void ()>, bool, bool, bool*) (/usr/local/bin/clang-21+0x5eead42)
#17 0x000055feeb7a7142 clang::Parser::ParsePostfixExpressionSuffix(clang::ActionResult<clang::Expr*, true>) (/usr/local/bin/clang-21+0x5ef1142)
#18 0x000055feeb79e5a7 clang::Parser::ParseCastExpression(clang::Parser::CastParseKind, bool, bool&, clang::Parser::TypeCastState, bool, bool*) (/usr/local/bin/clang-21+0x5ee85a7)
#19 0x000055feeb7a072e clang::Parser::ParseCastExpression(clang::Parser::CastParseKind, bool, clang::Parser::TypeCastState, bool, bool*) (/usr/local/bin/clang-21+0x5eea72e)
#20 0x000055feeb7a092d clang::Parser::ParseAssignmentExpression(clang::Parser::TypeCastState) (/usr/local/bin/clang-21+0x5eea92d)
#21 0x000055feeb7a5d7d clang::Parser::ParseExpression(clang::Parser::TypeCastState) (/usr/local/bin/clang-21+0x5eefd7d)
#22 0x000055feeb834d3f clang::Parser::ParseExprStatement(clang::Parser::ParsedStmtContext) (/usr/local/bin/clang-21+0x5f7ed3f)
#23 0x000055feeb8286b2 clang::Parser::ParseStatementOrDeclarationAfterAttributes(llvm::SmallVector<clang::Stmt*, 32u>&, clang::Parser::ParsedStmtContext, clang::SourceLocation*, clang::ParsedAttributes&, clang::ParsedAttributes&) (/usr/local/bin/clang-21+0x5f726b2)
#24 0x000055feeb829104 clang::Parser::ParseStatementOrDeclaration(llvm::SmallVector<clang::Stmt*, 32u>&, clang::Parser::ParsedStmtContext, clang::SourceLocation*) (/usr/local/bin/clang-21+0x5f73104)
#25 0x000055feeb82a46c clang::Parser::ParseCompoundStatementBody(bool) (/usr/local/bin/clang-21+0x5f7446c)
#26 0x000055feeb82c7e2 clang::Parser::ParseFunctionStatementBody(clang::Decl*, clang::Parser::ParseScope&) (/usr/local/bin/clang-21+0x5f767e2)
#27 0x000055feeb723e83 clang::Parser::ParseFunctionDefinition(clang::ParsingDeclarator&, clang::Parser::ParsedTemplateInfo const&, clang::Parser::LateParsedAttrList*) (/usr/local/bin/clang-21+0x5e6de83)
#28 0x000055feeb76df05 clang::Parser::ParseDeclGroup(clang::ParsingDeclSpec&, clang::DeclaratorContext, clang::ParsedAttributes&, clang::Parser::ParsedTemplateInfo&, clang::SourceLocation*, clang::Parser::ForRangeInit*) (/usr/local/bin/clang-21+0x5eb7f05)
#29 0x000055feeb71c62d clang::Parser::ParseDeclOrFunctionDefInternal(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec&, clang::AccessSpecifier) (/usr/local/bin/clang-21+0x5e6662d)
#30 0x000055feeb71d16e clang::Parser::ParseDeclarationOrFunctionDefinition(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec*, clang::AccessSpecifier) (/usr/local/bin/clang-21+0x5e6716e)
#31 0x000055feeb726d73 clang::Parser::ParseExternalDeclaration(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec*) (/usr/local/bin/clang-21+0x5e70d73)
#32 0x000055feeb7286a8 clang::Parser::ParseTopLevelDecl(clang::OpaquePtr<clang::DeclGroupRef>&, clang::Sema::ModuleImportState&) (/usr/local/bin/clang-21+0x5e726a8)
#33 0x000055feeb71662a clang::ParseAST(clang::Sema&, bool, bool) (/usr/local/bin/clang-21+0x5e6062a)
#34 0x000055fee9e84e45 clang::CodeGenAction::ExecuteAction() (/usr/local/bin/clang-21+0x45cee45)
#35 0x000055feea1699b8 clang::FrontendAction::Execute() (/usr/local/bin/clang-21+0x48b39b8)
#36 0x000055feea0e7d3b clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) (/usr/local/bin/clang-21+0x4831d3b)
#37 0x000055feea25bc7b clang::ExecuteCompilerInvocation(clang::CompilerInstance*) (/usr/local/bin/clang-21+0x49a5c7b)
#38 0x000055fee6758f51 cc1_main(llvm::ArrayRef<char const*>, char const*, void*) (/usr/local/bin/clang-21+0xea2f51)
#39 0x000055fee67515fd ExecuteCC1Tool(llvm::SmallVectorImpl<char const*>&, llvm::ToolContext const&) driver.cpp:0:0
#40 0x000055fee675499f clang_main(int, char**, llvm::ToolContext const&) (/usr/local/bin/clang-21+0xe9e99f)
#41 0x000055fee662730b main (/usr/local/bin/clang-21+0xd7130b)
#42 0x00007f5adb6b6083 __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x24083)
#43 0x000055fee675107e _start (/usr/local/bin/clang-21+0xe9b07e)
```
## Program
```
#include <stdlib.h>
#include <stdio.h>
struct Data { int dummy; };
double swap(struct Data *a, struct Data *b) {
}
int main() {
printf("%lf\n", swap((struct Data[5]){ {}, 1 },
(struct Data[5]){ {}, 4 }));
}
```
## Command
```
clang -x c -std=c2x test.c
```
## To Reproduce Quickly
https://gcc.godbolt.org/z/dG7sb8oW4
![]()
_______________________________________________
llvm-bugs mailing list
llvm-bugs@lists.llvm.org
https://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-bugs
