libs-base/Source/ObjectiveC2/properties.m

#include "runtime.h"

// Subset of NSObject interface needed for properties.
@interface NSObject {}
- (id)retain;
- (id)copy;
- (id)autorelease;
- (void)release;
@end

id
objc_getProperty(id obj, SEL _cmd, ptrdiff_t offset, BOOL isAtomic)
{
  char *addr;
  id ret;

  if (isAtomic)
    {
      @synchronized(obj)
	{
	  return objc_getProperty(obj, _cmd, offset, NO);
	}
    }
  addr = (char*)obj;
  addr += offset;
  ret = *(id*)addr;
  return [[ret retain] autorelease];
}

void
objc_setProperty(id obj, SEL _cmd, ptrdiff_t offset, id arg, BOOL isAtomic,
  BOOL isCopy)
{
  char *addr;
  id old;

  if (isAtomic)
    {
      @synchronized(obj)
	{
	  objc_setProperty(obj, _cmd, offset, arg, NO, isCopy);
	  return;
	}
    }
  if (isCopy)
    {
      arg = [arg copy];
    }
  else
    {
      arg = [arg retain];
    }
  addr = (char*)obj;
  addr += offset;
  old = *(id*)addr;
  *(id*)addr = arg;
  [old release];
}