test/accessors.m

   1 // TEST_CFLAGS -framework Foundation
   2
   3 #import <Foundation/Foundation.h>
   4 #import <objc/runtime.h>
   5 #import <objc/objc-abi.h>
   6 #include "test.h"
   7
   8 @interface Test : NSObject {
   9     NSString *_value;
  10     // _object is at the last optimized property offset
  11     id _object __attribute__((aligned(64)));
  12 }
  13 @property(readonly) Class cls;
  14 @property(copy) NSString *value;
  15 @property(assign) id object;
  16 @end
  17
  18 typedef struct {
  19     void *isa;
  20     void *_value;
  21     // _object is at the last optimized property offset
  22     void *_object __attribute__((aligned(64)));
  23 } TestDefs;
  24
  25 @implementation Test
  26
  27 // Question:  why can't this code be automatically generated?
  28
  29 #if !__has_feature(objc_arc)
  30 - (void)dealloc {
  31     self.value = nil;
  32     self.object = nil;
  33     [super dealloc];
  34 }
  35 #endif
  36
  37 - (Class)cls { return objc_getProperty(self, _cmd, 0, YES); }
  38
  39 - (NSString*)value { return (NSString*) objc_getProperty(self, _cmd, offsetof(TestDefs, _value), YES); }
  40 - (void)setValue:(NSString*)inValue { objc_setProperty(self, _cmd, offsetof(TestDefs, _value), inValue, YES, YES); }
  41
  42 - (id)object { return objc_getProperty(self, _cmd, offsetof(TestDefs, _object), YES); }
  43 - (void)setObject:(id)inObject { objc_setProperty(self, _cmd, offsetof(TestDefs, _object), inObject, YES, NO); }
  44
  45 - (NSString *)description {
  46     return [NSString stringWithFormat:@"value = %@, object = %@", self.value, self.object];
  47 }
  48
  49 @end
  50
  51 int main() {
  52     PUSH_POOL {
  53
  54         NSMutableString *value = [NSMutableString stringWithUTF8String:"test"];
  55         id object = [NSNumber numberWithInt:11];
  56         Test *t = AUTORELEASE([Test new]);
  57         t.value = value;
  58         [value setString:@"yuck"];      // mutate the string.
  59         testassert(t.value != value);   // must copy, since it was mutable.
  60         testassert([t.value isEqualToString:@"test"]);
  61
  62         Class testClass = [Test class];
  63         Class cls = t.cls;
  64         testassert(testClass == cls);
  65         cls = t.cls;
  66         testassert(testClass == cls);
  67
  68         t.object = object;
  69         t.object = object;
  70
  71         // NSLog(@"t.object = %@, t.value = %@", t.object, t.value);
  72         // NSLog(@"t.object = %@, t.value = %@", t.object, t.value); // second call will optimized getters.
  73
  74     } POP_POOL;
  75
  76     succeed(__FILE__);
  77
  78     return 0;
  79 }