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Don't crash if inserting a nil node

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This commit is contained in:
Michael Schneider
2016-07-21 14:41:19 -07:00
parent 8cde594de3
commit 4b9ee3c64d
1 changed files with 29 additions and 10 deletions
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39
AsyncDisplayKit/ASDisplayNode.mm
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@@ -1315,7 +1315,7 @@ static inline CATransform3D _calculateTransformFromReferenceToTarget(ASDisplayNo
return (id<CAAction>)[NSNull null]; return (id<CAAction>)[NSNull null];
} }
#pragma mark - #pragma mark - Managing the Node Hierarchy
static bool disableNotificationsForMovingBetweenParents(ASDisplayNode *from, ASDisplayNode *to) static bool disableNotificationsForMovingBetweenParents(ASDisplayNode *from, ASDisplayNode *to)
{ {
@@ -1331,9 +1331,11 @@ static bool disableNotificationsForMovingBetweenParents(ASDisplayNode *from, ASD
ASDisplayNodeAssertThreadAffinity(self); ASDisplayNodeAssertThreadAffinity(self);
ASDN::MutexLocker l(__instanceLock__); ASDN::MutexLocker l(__instanceLock__);
ASDisplayNodeAssert(subnode, @"Cannot insert a nil subnode");
ASDisplayNode *oldParent = subnode.supernode; ASDisplayNode *oldParent = subnode.supernode;
if (!subnode || subnode == self || oldParent == self) if (!subnode || subnode == self || oldParent == self) {
return; return;
}
// Disable appearance methods during move between supernodes, but make sure we restore their state after we do our thing // Disable appearance methods during move between supernodes, but make sure we restore their state after we do our thing
BOOL isMovingEquivalentParents = disableNotificationsForMovingBetweenParents(oldParent, self); BOOL isMovingEquivalentParents = disableNotificationsForMovingBetweenParents(oldParent, self);
@@ -1342,8 +1344,9 @@ static bool disableNotificationsForMovingBetweenParents(ASDisplayNode *from, ASD
} }
[subnode removeFromSupernode]; [subnode removeFromSupernode];
if (!_subnodes) if (!_subnodes) {
_subnodes = [[NSMutableArray alloc] init]; _subnodes = [[NSMutableArray alloc] init];
}
[_subnodes addObject:subnode]; [_subnodes addObject:subnode];
@@ -1379,8 +1382,14 @@ static bool disableNotificationsForMovingBetweenParents(ASDisplayNode *from, ASD
*/ */
- (void)_insertSubnode:(ASDisplayNode *)subnode atSubnodeIndex:(NSInteger)subnodeIndex sublayerIndex:(NSInteger)sublayerIndex andRemoveSubnode:(ASDisplayNode *)oldSubnode - (void)_insertSubnode:(ASDisplayNode *)subnode atSubnodeIndex:(NSInteger)subnodeIndex sublayerIndex:(NSInteger)sublayerIndex andRemoveSubnode:(ASDisplayNode *)oldSubnode
{ {
if (subnodeIndex == NSNotFound) if (subnodeIndex == NSNotFound) {
return; return;
}
ASDisplayNodeAssert(subnode, @"Cannot insert a nil subnode");
if (!subnode) {
return;
}
ASDisplayNode *oldParent = [subnode _deallocSafeSupernode]; ASDisplayNode *oldParent = [subnode _deallocSafeSupernode];
// Disable appearance methods during move between supernodes, but make sure we restore their state after we do our thing // Disable appearance methods during move between supernodes, but make sure we restore their state after we do our thing
@@ -1461,12 +1470,14 @@ static NSInteger incrementIfFound(NSInteger i) {
ASDN::MutexLocker l(__instanceLock__); ASDN::MutexLocker l(__instanceLock__);
ASDisplayNodeAssert(subnode, @"Cannot insert a nil subnode"); ASDisplayNodeAssert(subnode, @"Cannot insert a nil subnode");
if (!subnode) if (!subnode) {
return; return;
}
ASDisplayNodeAssert([below _deallocSafeSupernode] == self, @"Node to insert below must be a subnode"); ASDisplayNodeAssert([below _deallocSafeSupernode] == self, @"Node to insert below must be a subnode");
if ([below _deallocSafeSupernode] != self) if ([below _deallocSafeSupernode] != self) {
return; return;
}
ASDisplayNodeAssert(_subnodes, @"You should have subnodes if you have a subnode"); ASDisplayNodeAssert(_subnodes, @"You should have subnodes if you have a subnode");
@@ -1504,12 +1515,14 @@ static NSInteger incrementIfFound(NSInteger i) {
ASDN::MutexLocker l(__instanceLock__); ASDN::MutexLocker l(__instanceLock__);
ASDisplayNodeAssert(subnode, @"Cannot insert a nil subnode"); ASDisplayNodeAssert(subnode, @"Cannot insert a nil subnode");
if (!subnode) if (!subnode) {
return; return;
}
ASDisplayNodeAssert([above _deallocSafeSupernode] == self, @"Node to insert above must be a subnode"); ASDisplayNodeAssert([above _deallocSafeSupernode] == self, @"Node to insert above must be a subnode");
if ([above _deallocSafeSupernode] != self) if ([above _deallocSafeSupernode] != self) {
return; return;
}
ASDisplayNodeAssert(_subnodes, @"You should have subnodes if you have a subnode"); ASDisplayNodeAssert(_subnodes, @"You should have subnodes if you have a subnode");
@@ -1553,7 +1566,12 @@ static NSInteger incrementIfFound(NSInteger i) {
NSString *reason = [NSString stringWithFormat:@"Cannot insert a subnode at index %zd. Count is %zd", idx, _subnodes.count]; NSString *reason = [NSString stringWithFormat:@"Cannot insert a subnode at index %zd. Count is %zd", idx, _subnodes.count];
@throw [NSException exceptionWithName:NSInvalidArgumentException reason:reason userInfo:nil]; @throw [NSException exceptionWithName:NSInvalidArgumentException reason:reason userInfo:nil];
} }
ASDisplayNodeAssert(subnode, @"Cannot insert a nil subnode");
if (!subnode) {
return;
}
NSInteger sublayerIndex = NSNotFound; NSInteger sublayerIndex = NSNotFound;
// Account for potentially having other subviews // Account for potentially having other subviews
@@ -1601,8 +1619,9 @@ static NSInteger incrementIfFound(NSInteger i) {
// Don't call self.supernode here because that will retain/autorelease the supernode. This method -_removeSupernode: is often called while tearing down a node hierarchy, and the supernode in question might be in the middle of its -dealloc. The supernode is never messaged, only compared by value, so this is safe. // Don't call self.supernode here because that will retain/autorelease the supernode. This method -_removeSupernode: is often called while tearing down a node hierarchy, and the supernode in question might be in the middle of its -dealloc. The supernode is never messaged, only compared by value, so this is safe.
// The particular issue that triggers this edge case is when a node calls -removeFromSupernode on a subnode from within its own -dealloc method. // The particular issue that triggers this edge case is when a node calls -removeFromSupernode on a subnode from within its own -dealloc method.
if (!subnode || [subnode _deallocSafeSupernode] != self) if (!subnode || [subnode _deallocSafeSupernode] != self) {
return; return;
}
[_subnodes removeObjectIdenticalTo:subnode]; [_subnodes removeObjectIdenticalTo:subnode];