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January 3, 2019 06:56
objc_msgSend C version, from http://www.mulle-kybernetik.com/artikel/Optimization/opti-9.html
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| id c_objc_msgSend( struct objc_class /* ahem */ *self, SEL _cmd, ...) | |
| { | |
| struct objc_class *cls; | |
| struct objc_cache *cache; | |
| unsigned int hash; | |
| struct objc_method *method; | |
| unsigned int index; | |
| if( self) | |
| { | |
| cls = self->isa; | |
| cache = cls->cache; | |
| hash = cache->mask; | |
| index = (unsigned int) _cmd & hash; | |
| do | |
| { | |
| method = cache->buckets[ index]; | |
| if( ! method) | |
| goto recache; | |
| index = (index + 1) & cache->mask; | |
| } | |
| while( method->method_name != _cmd); | |
| return( (*method->method_imp)( (id) self, _cmd)); | |
| } | |
| return( (id) self); | |
| recache: | |
| /* | |
| * internal call _class_lookupMethodAndLoadCache to | |
| * look method and load into cache | |
| */ | |
| return( 0); | |
| } |
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