InternalHasFlag C++ implementation

InternalHasFlag.cpp

// preform (this & flags) != flags
FCIMPL2(FC_BOOL_RET, ReflectionEnum::InternalHasFlag, Object *pRefThis, Object* pRefFlags)
{
    FCALL_CONTRACT;

    VALIDATEOBJECT(pRefThis);

    BOOL cmp = false;

    _ASSERTE(pRefFlags != NULL); // Enum.cs would have thrown ArgumentNullException before calling into InternalHasFlag

    VALIDATEOBJECT(pRefFlags);

    void * pThis = pRefThis->UnBox();
    void * pFlags = pRefFlags->UnBox();

    MethodTable* pMTThis = pRefThis->GetMethodTable();

    _ASSERTE(!pMTThis->IsArray());  // bunch of assumptions about arrays wrong.
    _ASSERTE(pMTThis->GetNumInstanceFieldBytes() == pRefFlags->GetMethodTable()->GetNumInstanceFieldBytes()); // Enum.cs verifies that the types are Equivalent

    switch (pMTThis->GetNumInstanceFieldBytes()) {
    case 1:
        cmp = ((*(UINT8*)pThis & *(UINT8*)pFlags) == *(UINT8*)pFlags);
        break;
    case 2:
        cmp = ((*(UINT16*)pThis & *(UINT16*)pFlags) == *(UINT16*)pFlags);
        break;
    case 4:
        cmp = ((*(UINT32*)pThis & *(UINT32*)pFlags) == *(UINT32*)pFlags);
        break;
    case 8:
        cmp = ((*(UINT64*)pThis & *(UINT64*)pFlags) == *(UINT64*)pFlags);
        break;
    default:
        // should not reach here.
        UNREACHABLE_MSG("Incorrect Enum Type size!");
        break;
    }

    FC_RETURN_BOOL(cmp);
}
FCIMPLEND

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