{"id":1388,"date":"2018-11-13T09:25:19","date_gmt":"2018-11-13T01:25:19","guid":{"rendered":"http:\/\/www.yusian.com\/blog\/?p=1388"},"modified":"2018-11-27T17:20:40","modified_gmt":"2018-11-27T09:20:40","slug":"block%e6%9c%ac%e8%b4%a8","status":"publish","type":"post","link":"https:\/\/www.yusian.com\/blog\/project\/2018\/11\/13\/0925191388.html","title":{"rendered":"block\u672c\u8d28"},"content":{"rendered":"<p>1\u3001\u5199\u4e00\u4e2a\u7b80\u5355\u7684mac\u547d\u4ee4\u884c\u7a0b\u5e8f\uff0c\u5305\u542bblock\u5b9a\u4e49\u4e0e\u4f7f\u7528<\/p>\n<pre lang=\"objc\" line=\"1\">\r\n#import <Foundation\/Foundation.h>\r\n\r\nint main(int argc, const char * argv[]) {\r\n    @autoreleasepool {\r\n        void (^block)(void) = ^{\r\n            NSLog(@\"Hello block!\");\r\n        };\r\n        block();\r\n    }\r\n    return 0;\r\n}<\/pre>\n<p>2\u3001\u5728\u547d\u4ee4\u884c\u4e0b\u7f16\u8bd1\u6210c++\u6e90\u6587\u4ef6xcrun -sdk iphoneos clang -arch arm64 -rewrite-objc main.m<br \/>\n3\u3001\u5f97\u5230\u7684cpp\u6587\u4ef6\u67093\u4e07\u591a\u884c\uff0c\u627e\u5230\u5c3e\u90e8\u7684main\u51fd\u6570\uff0c\u4e0eblock\u76f8\u5173\u7684\u4ee3\u7801\u6709\uff1a<\/p>\n<pre lang=\"cpp\" line=\"1\">\/\/ 1\u3001block\u5b9a\u4e49\uff0c\u7ed3\u6784\u4f53__main_block_impl_0\r\nstruct __block_impl {\r\n    void *isa;\r\n    int Flags;\r\n    int Reserved;\r\n    void *FuncPtr;\r\n};\r\nstruct __main_block_impl_0 {\r\n    struct __block_impl impl;\r\n    struct __main_block_desc_0* Desc;\r\n    \/\/ \u7ed3\u6784\u4f53\u6784\u9020\u51fd\u6570\r\n    __main_block_impl_0(void *fp, struct __main_block_desc_0 *desc, int flags=0) {\r\n        impl.isa = &_NSConcreteStackBlock;\r\n        impl.Flags = flags;\r\n        impl.FuncPtr = fp;\r\n        Desc = desc;\r\n    }\r\n};\r\n\r\n\/\/ 2.1\u3001block\u4f53__main_block_func_0\u5c06\u505a\u4e3a\u53c2\u6570\u4f20\u5165block\u6784\u9020\u51fd\u6570\uff0c__main_block_impl_0\u7b2c\u4e00\u4e2a\u53c2\u6570\r\nstatic void __main_block_func_0(struct __main_block_impl_0 *__cself) {\r\n    \/\/ block\u5185\u90e8\u4ee3\u7801\r\n}\r\n\/\/ 2.2\u3001__main_block_impl_0\u6784\u9020\u51fd\u6570\u7b2c\u4e8c\u4e2a\u53c2\u6570\uff0c__main_block_desc_0\r\nstatic struct __main_block_desc_0 {\r\n    size_t reserved;\r\n    size_t Block_size;\r\n} __main_block_desc_0_DATA = { 0, sizeof(struct __main_block_impl_0)};\r\n\r\n\/* 3\u3001\u8c03\u7528\r\n block = &__main_block_impl_0(__main_block_func_0, &__main_block_desc_0_DATA);\r\n block->FuncPtr(block);\r\n *\/\r\nvoid (*block)(void) = ((void (*)())&__main_block_impl_0((void *)__main_block_func_0, &__main_block_desc_0_DATA));\r\n((void (*)(__block_impl *))((__block_impl *)block)->FuncPtr)((__block_impl *)block);<\/pre>\n<p>4\u3001\u603b\u7ed3\uff1ablock\u672c\u8d28\u662fOC\u5bf9\u8c61\uff0cblock\u4f53\u7b49\u4ef7\u4e8e\u5bf9\u8c61\u65b9\u6cd5\uff0c\u5728block\u4f53\u6267\u884c\u65f6\u4f1a\u8c03\u7528\u8be5\u65b9\u6cd5\uff1b<\/p>\n","protected":false},"excerpt":{"rendered":"<p>1\u3001\u5199\u4e00\u4e2a\u7b80\u5355\u7684mac\u547d\u4ee4\u884c\u7a0b\u5e8f\uff0c\u5305\u542bblock\u5b9a\u4e49\u4e0e\u4f7f\u7528 #import int main(int argc, const char * argv[]) { @autoreleasepool { void (^block)(void) = ^{ NSLog(@&#8221;Hello block!&#8221;); }; block(); } return 0; } 2\u3001\u5728\u547d\u4ee4\u884c\u4e0b\u7f16\u8bd1\u6210c++\u6e90\u6587\u4ef6xcrun -sdk iphoneos clang -arch arm64 -rewrite-objc main.m 3\u3001\u5f97\u5230\u7684cpp\u6587\u4ef6\u67093\u4e07\u591a\u884c\uff0c\u627e\u5230\u5c3e\u90e8\u7684main\u51fd\u6570\uff0c\u4e0eblock\u76f8\u5173\u7684\u4ee3\u7801\u6709\uff1a \/\/ 1\u3001block\u5b9a\u4e49\uff0c\u7ed3\u6784\u4f53__main_block_impl_0 struct __block_impl { void *isa; int Flags; int Reserved; void *FuncPtr; }; struct __main_block_impl_0 { struct __block_impl impl; struct __main_block_desc_0* [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[11],"tags":[177,5,179,178,180],"class_list":["post-1388","post","type-post","status-publish","format-standard","hentry","category-project","tag-block","tag-objc","tag-runtime","tag-xcrun","tag-180"],"_links":{"self":[{"href":"https:\/\/www.yusian.com\/blog\/wp-json\/wp\/v2\/posts\/1388","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.yusian.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.yusian.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.yusian.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.yusian.com\/blog\/wp-json\/wp\/v2\/comments?post=1388"}],"version-history":[{"count":0,"href":"https:\/\/www.yusian.com\/blog\/wp-json\/wp\/v2\/posts\/1388\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.yusian.com\/blog\/wp-json\/wp\/v2\/media?parent=1388"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.yusian.com\/blog\/wp-json\/wp\/v2\/categories?post=1388"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.yusian.com\/blog\/wp-json\/wp\/v2\/tags?post=1388"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}