objc/objc_property.c

   1 #import <objc/runtime.h>
   2 #import <string.h>
   3 #import <stddef.h>
   4 #import <stdlib.h>
   5 #import <ctype.h>
   6
   7 const char *property_getAttributes(objc_property_t property) {
   8     return property->attributes;
   9 }
  10
  11 const char *property_getName(objc_property_t property) {
  12     return property->name;
  13 }
  14
  15 id objc_assign_ivar(id self, id value, unsigned int offset) {
  16     //   NSCLog("objc_assign_ivar(%x,%s,%x,%s,%d)",self,(self!=nil)?self->isa->name:"nil",value,(value!=nil)?value->isa->name:"nil",offset);
  17     id *ivar = (id *)(((uint8_t *)self) + offset);
  18     return *ivar = value;
  19 }
  20
  21 void objc_copyStruct(void *dest, const void *src, size_t size, BOOL atomic, BOOL hasStrong) {
  22     int i;
  23
  24     for(i = 0; i < size; i++)
  25         ((uint8_t *)dest)[i] = ((uint8_t *)src)[i];
  26 }
  27
  28 void objc_setProperty(id self, SEL _cmd, size_t offset, id value, BOOL isAtomic, BOOL shouldCopy) {
  29     if(isAtomic) {
  30         //      NSUnimplementedFunction();
  31     }
  32     void *buffer = (void *)self + offset;
  33     id oldValue = *(id *)buffer;
  34
  35     static SEL copySelector = NULL;
  36     static SEL retainSelector = NULL;
  37     static SEL releaseSelector = NULL;
  38
  39     if(copySelector == NULL)
  40         copySelector = sel_getUid("copy");
  41     if(retainSelector == NULL)
  42         retainSelector = sel_getUid("retain");
  43     if(releaseSelector == NULL)
  44         releaseSelector = sel_getUid("releaseSelector");
  45
  46     SEL useSelector = shouldCopy ? copySelector : retainSelector;
  47     struct objc_method *assignMethod = class_getClassMethod(object_getClass(value), useSelector);
  48
  49     if(assignMethod != NULL)
  50         value = assignMethod->method_imp(value, useSelector);
  51
  52     *(id *)buffer = value;
  53
  54     struct objc_method *releaseMethod = class_getClassMethod(object_getClass(oldValue), releaseSelector);
  55     if(releaseMethod != NULL)
  56         releaseMethod->method_imp(oldValue, releaseSelector);
  57 }
  58
  59 id objc_getProperty(id self, SEL _cmd, size_t offset, BOOL isAtomic) {
  60     if(isAtomic) {
  61         //      NSUnimplementedFunction();
  62     }
  63
  64     void *buffer = (void *)self + offset;
  65     id value = *(id *)buffer;
  66
  67     return value;
  68 }