/// IsNoThrow - Test if the given class represents instructions which are always
/// safe to mark with the nounwind attribute..
static bool IsNoThrow(InstructionClass Class) {
+ // objc_retainBlock is not nounwind because it calls user copy constructors
+ // which could theoretically throw.
return Class == IC_Retain ||
Class == IC_RetainRV ||
- Class == IC_RetainBlock ||
Class == IC_Release ||
Class == IC_Autorelease ||
Class == IC_AutoreleaseRV ||
std::vector<Type *> Params;
Params.push_back(PointerType::getUnqual(Type::getInt8Ty(C)));
AttrListPtr Attributes;
- Attributes.addAttr(~0u, Attribute::NoUnwind);
+ // objc_retainBlock is not nounwind because it calls user copy constructors
+ // which could theoretically throw.
RetainBlockCallee =
M->getOrInsertFunction(
"objc_retainBlock",