OC_block_0x03

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有自动变量，且有__block存储域类说明符：

struct __Block_byref_val_0 {

　　void *__isa;

　　__Block_byref_val_0 *__forwarding;

　　int __flags;

　　int __size;

　　int val;

};

struct __main_block_impl_0 {

　　struct __block_impl impl;

　　struct __main_block_desc_0 *Desc;

　　__Block_byref_val_0 *val; // by ref

　　__main_block_impl_0(void *fp, struct __main_block_desc_0 *desc, __Block_byref_val_0 *_val, int flags=0) : val(_val->__forwarding) {

　　impl.isa = &_NSConcretesStackBlock;

　　impl.Flags = flags;

　　impl.FuncPtr = fp;

　　Desc = desc;

　　}

};

static void __main_block_func_0(struct __main_block_impl_0 *__cself) {

　　__Block_byref_val_0 *val = __cself->val; // bound by ref

　　(val->__forwarding->val) = 1;

}

static void __main_block_copy_0(struct __main_block_impl_0 *dst, struct __main_block_impl_0 *src) {

　　_Block_object_assign((void *)&dst->val, (void*)src->val, 8/*BLOCK_FIELD_IS_BYREF*/);}

static void __main_block_dispose_0(struct __main_block_impl_0 *src){_Block_object_dispose((void*)src->val, 8/*BLOCK_FIELD_IS_BYREF*/);}

static struct __main_block_desc_0 {

　　size_t reserved;

　　size_t Block_size;

　　void (*copy)(struct __main_block_impl_0 *, struct __main_block_impl_0*);

　　void (*dispose)(struct __main_block_impl_0*);

}__main_block_desc_0_DATA = {0, sizeof(struct __main_block_impl_0), __main_block_copy_0, __main_block_dispose_0};

int main ()

{

　　__attribute __((__blocks__(byref)))__Block_byref_val_0 val = {(void*)0, (__Block_byref_val_0*)&val, 0, sizeof(__Block_byref_val_0), 0};

　　void (*blk)(void) = (((void(*)())&__main_block_impl_0((void*)__main_block_func_0, &__main_block_desc_0_DATA,(__Block_byref_val_0*)&val,570425344));

　　((void(*)(__block_impl*))((__block_imp *)blk)->FuncPtr)((__block_impl*)blk);

　　return 0;

}

OC_block_0x03

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原文地址：http://www.cnblogs.com/fkunlam/p/4906452.html