101 lines
4.4 KiB
Objective-C
101 lines
4.4 KiB
Objective-C
// RUN: %clang_cc1 -fsyntax-only -fobjc-runtime-has-weak -fobjc-arc -fblocks -Wno-objc-root-class -Wreceiver-is-weak -verify %s
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// rdar://10225276
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@interface Test0
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- (void) setBlock: (void(^)(void)) block;
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- (void) addBlock: (void(^)(void)) block;
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- (void) actNow;
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@end
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void test0(Test0 *x) {
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__weak Test0 *weakx = x;
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[x addBlock: ^{ [weakx actNow]; }]; // expected-warning {{weak receiver may be unpredictably set to nil}} expected-note {{assign the value to a strong variable to keep the object alive during use}}
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[x setBlock: ^{ [weakx actNow]; }]; // expected-warning {{weak receiver may be unpredictably set to nil}} expected-note {{assign the value to a strong variable to keep the object alive during use}}
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x.block = ^{ [weakx actNow]; }; // expected-warning {{weak receiver may be unpredictably set to nil}} expected-note {{assign the value to a strong variable to keep the object alive during use}}
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[weakx addBlock: ^{ [x actNow]; }]; // expected-warning {{weak receiver may be unpredictably set to nil}} expected-note {{assign the value to a strong variable to keep the object alive during use}}
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[weakx setBlock: ^{ [x actNow]; }]; // expected-warning {{weak receiver may be unpredictably set to nil}} expected-note {{assign the value to a strong variable to keep the object alive during use}}
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weakx.block = ^{ [x actNow]; }; // expected-warning {{weak receiver may be unpredictably set to nil}} expected-note {{assign the value to a strong variable to keep the object alive during use}}
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}
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@interface Test
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{
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__weak Test* weak_prop;
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}
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- (void) Meth;
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@property __weak Test* weak_prop; // expected-note {{property declared here}}
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@property (weak, atomic) id weak_atomic_prop; // expected-note {{property declared here}}
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- (__weak id) P; // expected-note {{method 'P' declared here}}
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@end
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@implementation Test
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- (void) Meth {
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if (self.weak_prop) {
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self.weak_prop = 0;
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}
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if (self.weak_atomic_prop) {
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self.weak_atomic_prop = 0;
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}
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[self.weak_prop Meth]; // expected-warning {{weak property may be unpredictably set to nil}} expected-note {{assign the value to a strong variable to keep the object alive during use}}
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id pi = self.P;
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[self.weak_atomic_prop Meth]; // expected-warning {{weak property may be unpredictably set to nil}} expected-note {{assign the value to a strong variable to keep the object alive during use}}
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[self.P Meth]; // expected-warning {{weak implicit property may be unpredictably set to nil}} expected-note {{assign the value to a strong variable to keep the object alive during use}}
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}
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- (__weak id) P { return 0; }
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@dynamic weak_prop, weak_atomic_prop;
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@end
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@interface MyClass {
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__weak MyClass *_parent;
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}
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@property (weak) MyClass *parent; // expected-note 4 {{property declared here}}
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@end
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@implementation MyClass
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@synthesize parent = _parent;
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- (void)doSomething
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{
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[[self parent] doSomething]; // expected-warning {{weak property may be unpredictably set to nil}} expected-note {{assign the value to a strong variable to keep the object alive during use}}
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(void)self.parent.doSomething; // expected-warning {{weak property may be unpredictably set to nil}} expected-note {{assign the value to a strong variable to keep the object alive during use}}
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}
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@end
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// Weak properties on protocols can be synthesized by an adopting class.
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@protocol MyProtocol
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@property (weak) id object; // expected-note 2 {{property declared here}}
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@end
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void testProtocol(id <MyProtocol> input) {
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[[input object] Meth]; // expected-warning {{weak property may be unpredictably set to nil}} expected-note {{assign the value to a strong variable to keep the object alive during use}}
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[input.object Meth]; // expected-warning {{weak property may be unpredictably set to nil}} expected-note {{assign the value to a strong variable to keep the object alive during use}}
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}
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@interface Subclass : MyClass
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// Unnecessarily redeclare -parent.
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- (id)parent;
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@end
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@implementation Subclass
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- (id)parent {
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return [super parent];
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}
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- (void)doSomethingElse {
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[[self parent] doSomething]; // expected-warning {{weak property may be unpredictably set to nil}} expected-note {{assign the value to a strong variable to keep the object alive during use}}
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(void)self.parent.doSomething; // expected-warning {{weak property may be unpredictably set to nil}} expected-note {{assign the value to a strong variable to keep the object alive during use}}
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}
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@end
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