[cfe-dev] Regression in clang. Crash when compiling simple objc file

[Jean-Daniel Dupas]

Hello,

I encounter a annoying segfault in clang when compiling simple obj-c file. This error only 1 or 2 week old. 

I managed to create a simple test case:

# clang --version
clang version 1.1 (trunk 93721)
Target: x86_64-apple-darwin10
Thread model: posix

This is a Release-Assert build compiled using llvm-gcc-4.2 from Xcode 3.2.1.

-------------------------------- Track.m --------------------------------
// clang -arch i386 -O0 -gdwarf-2 -c Track.m

#import <Cocoa/Cocoa.h>

@interface SATrack : NSObject {
@private

}

- (CGSize)size;

- (id)valueForAttribute:(NSString *)anAttribute;

@end

@implementation SATrack

- (CGSize)size {
  NSValue *s = [self valueForAttribute:@"sapphire.aperture.clean"];
  if (!s)
    s = [self valueForAttribute:@"sapphire.track.size"];
  if (s)
    return NSSizeToCGSize([s sizeValue]);
  return CGSizeZero;
}

- (id)valueForAttribute:(NSString *)anAttribute { 
  return nil;
}

@end
--------------------------------------------------------------------------------

clang -arch i386 -O0 -gdwarf-2 -c Track.m
0  clang             0x0000000100db9e62 PrintStackTrace(void*) + 34
1  clang             0x0000000100dba344 SignalHandler(int) + 468
2  libSystem.B.dylib 0x00007fff87ce4eaa _sigtramp + 26
3  libSystem.B.dylib 0x00000001013c7a50 _sigtramp + 2037263296
4  clang             0x000000010092f8d3 llvm::SelectionDAGBuilder::visitCall(llvm::CallInst&) + 787
5  clang             0x0000000100952233 llvm::SelectionDAGISel::SelectBasicBlock(llvm::BasicBlock*, llvm::ilist_iterator<llvm::Instruction>, llvm::ilist_iterator<llvm::Instruction>, bool&) + 179
6  clang             0x00000001009529a3 llvm::SelectionDAGISel::SelectAllBasicBlocks(llvm::Function&, llvm::MachineFunction&, llvm::MachineModuleInfo*, llvm::DwarfWriter*, llvm::TargetInstrInfo const&) + 1619
7  clang             0x000000010095381c llvm::SelectionDAGISel::runOnMachineFunction(llvm::MachineFunction&) + 1084
8  clang             0x0000000100a1c44b llvm::MachineFunctionPass::runOnFunction(llvm::Function&) + 43
9  clang             0x0000000100d51acd llvm::FPPassManager::runOnFunction(llvm::Function&) + 429
10 clang             0x0000000100d51ca4 llvm::FunctionPassManagerImpl::run(llvm::Function&) + 100
11 clang             0x0000000100d51e4e llvm::FunctionPassManager::run(llvm::Function&) + 78
12 clang             0x0000000100030515 (anonymous namespace)::BackendConsumer::HandleTranslationUnit(clang::ASTContext&) + 773
13 clang             0x0000000100304a93 clang::ParseAST(clang::Preprocessor&, clang::ASTConsumer*, clang::ASTContext&, bool, bool, clang::CodeCompleteConsumer*) + 387
14 clang             0x00000001000375ae clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) + 302
15 clang             0x000000010001f546 cc1_main(char const**, char const**, char const*, void*) + 2102
16 clang             0x0000000100021a54 main + 2052
17 clang             0x000000010001d328 start + 52
18 clang             0x000000000000001d start + 4294847785
Stack dump:
0.	Program arguments: /Users/jddupas/Projects/OpenSource/llvm/Release-Asserts/bin/clang -cc1 -triple i386-apple-darwin10.0 -S -disable-free -main-file-name Track.m -pic-level 1 -mdisable-fp-elim -target-cpu yonah -g -resource-dir /Users/jddupas/Projects/OpenSource/llvm/Release-Asserts/lib/clang/1.1 -O0 -fmessage-length 172 -stack-protector 1 -fblocks -fdiagnostics-show-option -fcolor-diagnostics -o /var/folders/u-/u-YCVFReEbeFgXey1xAjx++++TI/-Tmp-/cc-RmAqfu.s -x objective-c Track.m 
1.	<eof> parser at end of file
2.	Code generation
3.	Running pass 'X86 DAG->DAG Instruction Selection' on function '@"\01-[SATrack size]"'
clang: error: compiler command failed due to signal 11 (use -v to see invocation)


-- Jean-Daniel




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