[LLVMbugs] [Bug 11372] New: Compiling code with anonymous struct within anonymous union is casuing a segfault

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=11372

             Bug #: 11372
           Summary: Compiling code with anonymous struct within anonymous
                    union is casuing a segfault
           Product: clang
           Version: 2.9
          Platform: Macintosh
        OS/Version: MacOS X
            Status: NEW
          Severity: normal
          Priority: P
         Component: Frontend
        AssignedTo: unassignedclangbugs at nondot.org
        ReportedBy: mdorgan at arena.net
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified


Attempting to isolate to just the below case does not crash, but it does crash
within our code base.  Changing the compiler back to gcc 4.2 within xcode, or
naming the below anonymous union removes the crash and things compiler fine:

// This crashes
class foo {
public:
  foo() { }

  union
  {
    struct 
    {
      unsigned short x;
      unsigned short y;
      unsigned short z;
    };
    unsigned short vec[3];
  };
};

// This works
class foo {
public:
  foo() { }

  union not_anon
  {
    struct 
    {
      unsigned short x;
      unsigned short y;
      unsigned short z;
    };
    unsigned short vec[3];
  };

  not_anon u;
};

--version reports
Apple clang version 3.0 (tags/Apple/clang-211.10.1) (based on LLVM 3.0svn)
Target: x86+64-apple-darwin10.8.0
Thread model: posix


I am compiling to an Armv7 target.  Here is the segfault dump:
0  clang             0x0000000100de1022 PrintStackTrace(void*) + 34
1  clang             0x0000000100de14f9 SignalHandler(int) + 633
2  libSystem.B.dylib 0x00007fff83c4d1ba _sigtramp + 26
3  libSystem.B.dylib 0x000000000006b030 _sigtramp + 2084691600
4  clang             0x00000001002b2b0a
llvm::GetElementPtrInst::GetElementPtrInst<llvm::Value**>(llvm::Value*,
llvm::Value**, llvm::Value**, unsigned int, llvm::Twine const&,
llvm::Instruction*) + 202
5  clang             0x0000000100692a49 llvm::IRBuilder<false,
llvm::ConstantFolder, llvm::IRBuilderDefaultInserter<false>
>::CreateConstInBoundsGEP2_32(llvm::Value*, unsigned int, unsigned int,
llvm::Twine const&) + 185
6  clang             0x00000001002b276c
clang::CodeGen::CodeGenFunction::EmitLValueForField(llvm::Value*,
clang::FieldDecl const*, unsigned int) + 492
7  clang             0x0000000100507fb5
clang::CodeGen::CodeGenFunction::EmitLValueForFieldInitialization(llvm::Value*,
clang::FieldDecl const*, unsigned int) + 85
8  clang             0x000000010050356a
clang::CodeGen::CodeGenFunction::EmitCtorPrologue(clang::CXXConstructorDecl
const*, clang::CXXCtorType, clang::CodeGen::FunctionArgList&) + 1322
9  clang             0x0000000100502c84
clang::CodeGen::CodeGenFunction::EmitConstructorBody(clang::CodeGen::FunctionArgList&)
+ 340
10 clang             0x0000000100684df3
clang::CodeGen::CodeGenFunction::GenerateCode(clang::GlobalDecl,
llvm::Function*, clang::CodeGen::CGFunctionInfo const&) + 675
11 clang             0x0000000100502af3
clang::CodeGen::CodeGenModule::EmitCXXConstructor(clang::CXXConstructorDecl
const*, clang::CXXCtorType) + 243
12 clang             0x000000010068685d
clang::CodeGen::CodeGenModule::EmitGlobalDefinition(clang::GlobalDecl) + 285
13 clang             0x000000010011a49d
clang::CodeGen::CodeGenModule::EmitDeferred() + 189
14 clang             0x000000010011a2e4
clang::CodeGen::CodeGenModule::Release() + 20
15 clang             0x000000010011a1ad
clang::BackendConsumer::HandleTranslationUnit(clang::ASTContext&) + 93
16 clang             0x0000000100042176 clang::ParseAST(clang::Sema&, bool) +
422
17 clang             0x0000000100040baf clang::CodeGenAction::ExecuteAction() +
671
18 clang             0x000000010002cafb
clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) + 875
19 clang             0x000000010002ab78
clang::ExecuteCompilerInvocation(clang::CompilerInstance*) + 2696
20 clang             0x000000010001f365 cc1_main(char const**, char const**,
char const*, void*) + 5333
21 clang             0x000000010000256b main + 667
22 clang             0x00000001000022c4 start + 52
23 clang             0x000000000000006a start + 4294958554

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