GlobalVariable *GV = cast<GlobalVariable>(getContext());
if (!GV->hasInitializer()) return NULL;
ConstantStruct *CS = cast<ConstantStruct>(GV->getInitializer());
GlobalVariable *GV = cast<GlobalVariable>(getContext());
if (!GV->hasInitializer()) return NULL;
ConstantStruct *CS = cast<ConstantStruct>(GV->getInitializer());