objective-c - @autorelease 指令和异常处理

Question

- (void)foo
{
    @try {
         for (id o in os){
             @autoreleasepool {
                 for (id o2 in moreOs){
                       // create a lot of autoreleased objects.
                 }
                //exception raised
            }
        }

    }
    @catch (NSException *exception) {
     // handle the exception   
    }
}

1. 如果发生异常，编译器会重写上述代码以排空池还是会泄漏？

2. 如果编译器确实重写了它，它将如何重写？

Answer 1

它不会耗尽水池。来自 Transitioning to ARC Release Notes :

On entry, an autorelease pool is pushed. On normal exit (break, return, goto, fall-through, and so on) the autorelease pool is popped. For compatibility with existing code, if exit is due to an exception, the autorelease pool is not popped.