[LLVMbugs] [Bug 12073] New: Crash in union

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=12073

             Bug #: 12073
           Summary: Crash in union
           Product: clang
           Version: unspecified
          Platform: PC
        OS/Version: Windows NT
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: C++
        AssignedTo: unassignedclangbugs at nondot.org
        ReportedBy: theone at ngs.ru
                CC: dgregor at apple.com, llvmbugs at cs.uiuc.edu
    Classification: Unclassified


I tried to compile in XCode 4.2 with this code :

class cVector3du
{
public:
    typedef cVector3d & cVector3dRef;
    union
    {
        struct
        {
            float x;
            float y;
            float z;
        };
        float v[3];
    };
};

class cMatrix4x4
{
public:
    union
    {
        struct
        {
            sAxes       axes;
            cVector3du  m_origin;
            float       m_w4;
        };
        struct
        {
            float _11, _12, _13, _14;
            float _21, _22, _23, _24;
            float _31, _32, _33, _34;
            float _41, _42, _43, _44;
        };
        float m[4][4];
        float f[16];
    };

    static const cMatrix4x4 Identity;

    cMatrix4x4(){};
    cMatrix4x4(float m11, float m12, float m13, float m14, float m21, float
m22, float m23, float m24,
               float m31, float m32, float m33, float m34, float m41, float
m42, float m43, float m44):
               _11(m11), _12(m12), _13( m13), _14(m14), _21(m21), _22(m22),
_23( m23 ), _24( m24),
               _31(m31), _32(m32), _33( m33), _34(m34), _41(m41), _42(m42),
_43( m43 ), _44( m44){}
    cMatrix4x4( const cVector3d & origin );
    cMatrix4x4( const cVector3d & origin, const cVector3d & scale );
};

Compiler crashed with this stack 
0  clang             0x0000000100de1252 PrintStackTrace(void*) + 34
1  clang             0x0000000100de1729 SignalHandler(int) + 633
2  libSystem.B.dylib 0x00007fff82d9c1ba _sigtramp + 26
3  libSystem.B.dylib 0x0000003f000692e0 _sigtramp + 2100089152
4  clang             0x00000001002b2d5a
llvm::GetElementPtrInst::GetElementPtrInst<llvm::Value**>(llvm::Value*,
llvm::Value**, llvm::Value**, unsigned int, llvm::Twine const&,
llvm::Instruction*) + 202
5  clang             0x0000000100692d09 llvm::IRBuilder<false,
llvm::ConstantFolder, llvm::IRBuilderDefaultInserter<false>
>::CreateConstInBoundsGEP2_32(llvm::Value*, unsigned int, unsigned int,
llvm::Twine const&) + 185
6  clang             0x00000001002b29bc
clang::CodeGen::CodeGenFunction::EmitLValueForField(llvm::Value*,
clang::FieldDecl const*, unsigned int) + 492
7  clang             0x0000000100508245
clang::CodeGen::CodeGenFunction::EmitLValueForFieldInitialization(llvm::Value*,
clang::FieldDecl const*, unsigned int) + 85
8  clang             0x00000001005037fa
clang::CodeGen::CodeGenFunction::EmitCtorPrologue(clang::CXXConstructorDecl
const*, clang::CXXCtorType, clang::CodeGen::FunctionArgList&) + 1322
9  clang             0x0000000100502f14
clang::CodeGen::CodeGenFunction::EmitConstructorBody(clang::CodeGen::FunctionArgList&)
+ 340
10 clang             0x00000001006850b3
clang::CodeGen::CodeGenFunction::GenerateCode(clang::GlobalDecl,
llvm::Function*, clang::CodeGen::CGFunctionInfo const&) + 675
11 clang             0x0000000100502d83
clang::CodeGen::CodeGenModule::EmitCXXConstructor(clang::CXXConstructorDecl
const*, clang::CXXCtorType) + 243
12 clang             0x0000000100686b1d
clang::CodeGen::CodeGenModule::EmitGlobalDefinition(clang::GlobalDecl) + 285
13 clang             0x000000010011a64d
clang::CodeGen::CodeGenModule::EmitDeferred() + 189
14 clang             0x000000010011a494
clang::CodeGen::CodeGenModule::Release() + 20
15 clang             0x000000010011a35d
clang::BackendConsumer::HandleTranslationUnit(clang::ASTContext&) + 93
16 clang             0x0000000100042276 clang::ParseAST(clang::Sema&, bool) +
422
17 clang             0x0000000100040caf clang::CodeGenAction::ExecuteAction() +
671
18 clang             0x000000010002ca9b
clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) + 875
19 clang             0x000000010002ab18
clang::ExecuteCompilerInvocation(clang::CompilerInstance*) + 2696
20 clang             0x000000010001f315 cc1_main(char const**, char const**,
char const*, void*) + 5333
21 clang             0x000000010000247b main + 667
22 clang             0x00000001000021d4 start + 52


I was able to solve problem:

struct matrix4x4
{
    union
    {
        struct
        {
            sAxes       axes;
            cVector3du  m_origin;
            float       m_w4;
        };
        struct
        {
            float _11, _12, _13, _14;
            float _21, _22, _23, _24;
            float _31, _32, _33, _34;
            float _41, _42, _43, _44;
        };
        float m[4][4];
        float f[16];
    };
};

class cMatrix4x4 : public matrix4x4
{
public:
    static const cMatrix4x4 Identity;

    cMatrix4x4(){};
    cMatrix4x4(float m11, float m12, float m13, float m14, float m21, float
m22, float m23, float m24,
               float m31, float m32, float m33, float m34, float m41, float
m42, float m43, float m44):
               _11(m11), _12(m12), _13( m13), _14(m14), _21(m21), _22(m22),
_23( m23 ), _24( m24),
               _31(m31), _32(m32), _33( m33), _34(m34), _41(m41), _42(m42),
_43( m43 ), _44( m44){}
    cMatrix4x4( const cVector3d & origin );
    cMatrix4x4( const cVector3d & origin, const cVector3d & scale );
};

But this is not what i like to put in my project. 

Thanks in advance.

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