// RUN: %clang_cc1 -fsyntax-only -fobjc-runtime-has-weak -fobjc-arc -fblocks -verify -Wno-objc-root-class -Wno-implicit-retain-self %s
void *_Block_copy(const void *block);
@interface Test0
- (void) setBlock: (void(^)(void)) block;
- (void) addBlock: (void(^)(void)) block;
- (void) actNow;
@end
void test0(Test0 *x) {
[x setBlock: // expected-note {{block will be retained by the captured object}}
^{ [x actNow]; }]; // expected-warning {{capturing 'x' strongly in this block is likely to lead to a retain cycle}}
x.block = // expected-note {{block will be retained by the captured object}}
^{ [x actNow]; }; // expected-warning {{capturing 'x' strongly in this block is likely to lead to a retain cycle}}
[x addBlock: // expected-note {{block will be retained by the captured object}}
^{ [x actNow]; }]; // expected-warning {{capturing 'x' strongly in this block is likely to lead to a retain cycle}}
// These actually don't cause retain cycles.
__weak Test0 *weakx = x;
[x addBlock: ^{ [weakx actNow]; }];
[x setBlock: ^{ [weakx actNow]; }];
x.block = ^{ [weakx actNow]; };
// These do cause retain cycles, but we're not clever enough to figure that out.
[weakx addBlock: ^{ [x actNow]; }];
[weakx setBlock: ^{ [x actNow]; }];
weakx.block = ^{ [x actNow]; };
x.block = ^{ (void)x.actNow; }; // expected-warning {{capturing 'x' strongly in this block is likely to lead to a retain cycle}} \
// expected-note {{block will be retained by the captured object}}
}
@interface BlockOwner
@property (retain) void (^strong)(void); // expected-warning {{retain'ed block property does not copy the block - use copy attribute instead}}
@end
@interface Test1 {
@public
BlockOwner *owner;
};
@property (retain) BlockOwner *owner;
@property (assign) __strong BlockOwner *owner2; // expected-error {{unsafe_unretained property 'owner2' may not also be declared __strong}}
@property (assign) BlockOwner *owner3;
@end
void test1(Test1 *x) {
x->owner.strong = ^{ (void) x; }; // expected-warning {{retain cycle}} expected-note {{block will be retained by an object strongly retained by the captured object}}
x.owner.strong = ^{ (void) x; }; // expected-warning {{retain cycle}} expected-note {{block will be retained by an object strongly retained by the captured object}}
x.owner2.strong = ^{ (void) x; };
x.owner3.strong = ^{ (void) x; };
}
@implementation Test1 {
BlockOwner * __unsafe_unretained owner3ivar;
__weak BlockOwner *weakowner;
}
@dynamic owner;
@dynamic owner2;
@synthesize owner3 = owner3ivar;
- (id) init {
self.owner.strong = ^{ (void) owner; }; // expected-warning {{retain cycle}} expected-note {{block will be retained by an object strongly retained by the captured object}}
self.owner2.strong = ^{ (void) owner; };
// TODO: should we warn here? What's the story with this kind of mismatch?
self.owner3.strong = ^{ (void) owner; };
owner.strong = ^{ (void) owner; }; // expected-warning {{retain cycle}} expected-note {{block will be retained by an object strongly retained by the captured object}}
owner.strong = ^{ ^{ (void) owner; }(); }; // expected-warning {{retain cycle}} expected-note {{block will be retained by an object strongly retained by the captured object}}
owner.strong = ^{ (void) sizeof(self); // expected-note {{block will be retained by an object strongly retained by the captured object}}
(void) owner; }; // expected-warning {{capturing 'self' strongly in this block is likely to lead to a retain cycle}}
weakowner.strong = ^{ (void) owner; };
return self;
}
- (void) foo {
owner.strong = ^{ (void) owner; }; // expected-warning {{retain cycle}} expected-note {{block will be retained by an object strongly retained by the captured object}}
}
@end
void test2_helper(id);
@interface Test2 {
void (^block)(void);
id x;
}
@end
@implementation Test2
- (void) test {
block = ^{ // expected-note {{block will be retained by an object strongly retained by the captured object}}
test2_helper(x); // expected-warning {{capturing 'self' strongly in this block is likely to lead to a retain cycle}}
};
}
@end
@interface NSOperationQueue {}
- (void)addOperationWithBlock:(void (^)(void))block;
- (void)addSomethingElse:(void (^)(void))block;
@end
@interface Test3 {
NSOperationQueue *myOperationQueue;
unsigned count;
}
@end
void doSomething(unsigned v);
@implementation Test3
- (void) test {
// 'addOperationWithBlock:' is specifically allowlisted.
[myOperationQueue addOperationWithBlock:^() { // no-warning
if (count > 20) {
doSomething(count);
}
}];
}
- (void) test_positive {
// Check that we are really allowlisting 'addOperationWithBlock:' and not doing
// something funny.
[myOperationQueue addSomethingElse:^() { // expected-note {{block will be retained by an object strongly retained by the captured object}}
if (count > 20) {
doSomething(count); // expected-warning {{capturing 'self' strongly in this block is likely to lead to a retain cycle}}
}
}];
}
@end
void testBlockVariable(void) {
typedef void (^block_t)(void);
// This case will be caught by -Wuninitialized, and does not create a
// retain cycle.
block_t a1 = ^{
a1(); // no-warning
};
// This case will also be caught by -Wuninitialized.
block_t a2;
a2 = ^{
a2(); // no-warning
};
__block block_t b1 = ^{ // expected-note{{block will be retained by the captured object}}
b1(); // expected-warning{{capturing 'b1' strongly in this block is likely to lead to a retain cycle}}
};
__block block_t b2;
b2 = ^{ // expected-note{{block will be retained by the captured object}}
b2(); // expected-warning{{capturing 'b2' strongly in this block is likely to lead to a retain cycle}}
};
}
@interface NSObject
- (id)copy;
- (void (^)(void))someRandomMethodReturningABlock;
@end
void testCopying(Test0 *obj) {
typedef void (^block_t)(void);
[obj setBlock:[^{ // expected-note{{block will be retained by the captured object}}
[obj actNow]; // expected-warning{{capturing 'obj' strongly in this block is likely to lead to a retain cycle}}
} copy]];
[obj addBlock:(__bridge_transfer block_t)_Block_copy((__bridge void *)^{ // expected-note{{block will be retained by the captured object}}
[obj actNow]; // expected-warning{{capturing 'obj' strongly in this block is likely to lead to a retain cycle}}
})];
[obj addBlock:[^{
[obj actNow]; // no-warning
} someRandomMethodReturningABlock]];
extern block_t someRandomFunctionReturningABlock(block_t);
[obj setBlock:someRandomFunctionReturningABlock(^{
[obj actNow]; // no-warning
})];
}
void func(int someCondition) {
__block void(^myBlock)(void) = ^{
if (someCondition) {
doSomething(1);
myBlock();
}
else {
myBlock = ((void*)0);
}
};
}
typedef void (^a_block_t)(void);
@interface HonorNoEscape
- (void)addStuffUsingBlock:(__attribute__((noescape)) a_block_t)block;
@end
void testNoEscape(HonorNoEscape *obj) {
[obj addStuffUsingBlock:^{
(void)obj; // ok.
}];
}
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