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Fix miscellaneous static analyzer warnings #7670

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merged 4 commits into from
Jan 11, 2017
+9 −22
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Fix miscellaneous static analyzer warnings #7670

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4adb075
[ios, macos] Fixed static analyzer warnings
1ec5 Jan 11, 2017
37ef97a
[ios] Fixed static analyzer warnings
1ec5 Jan 11, 2017
cce1231
[macos] Fixed static analyzer warnings
1ec5 Jan 11, 2017
d7e63d0
[ios, macos] Two pointer-equal images are object-equal by definition
1ec5 Jan 11, 2017
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4 changes: 0 additions & 4 deletions platform/darwin/src/MGLNetworkConfiguration.m
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@@ -1,5 +1,4 @@
#import "MGLNetworkConfiguration.h"
#import "NSProcessInfo+MGLAdditions.h"

@implementation MGLNetworkConfiguration

Expand All @@ -12,9 +11,6 @@ + (void)load {
}

+ (instancetype)sharedManager {
if (NSProcessInfo.processInfo.mgl_isInterfaceBuilderDesignablesAgent) {
return nil;
}
static dispatch_once_t onceToken;
static MGLNetworkConfiguration *_sharedManager;
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@1ec5 1ec5 Jan 11, 2017 •
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+[MGLAccountManager sharedManager] bails in IB because MGLAccountManager spins up lots of other machinery, including MGLMapboxEvents. MGLNetworkConfiguration is intentionally isolated from anything else, so initializing the singleton within IB is no big deal.

void (^setupBlock)() = ^{
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2 changes: 1 addition & 1 deletion platform/darwin/src/MGLRasterSource.mm
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Expand Up @@ -51,7 +51,7 @@ - (instancetype)initWithIdentifier:(NSString *)identifier tileURLTemplates:(NS_A
if (self = [super initWithIdentifier:identifier tileURLTemplates:tileURLTemplates options:options]) {
mbgl::Tileset tileSet = MGLTileSetFromTileURLTemplates(tileURLTemplates, options);

uint16_t tileSize;
uint16_t tileSize = MGLRasterSourceRetinaTileSize;
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I had somehow forgotten that primitive-typed stack variables are uninitialized in Objective-C just as they are in C. ARC nils out only object pointers on the stack.

if (NSNumber *tileSizeNumber = options[MGLTileSourceOptionTileSize]) {
if (![tileSizeNumber isKindOfClass:[NSNumber class]]) {
[NSException raise:NSInvalidArgumentException
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4 changes: 1 addition & 3 deletions platform/darwin/src/MGLShape.mm
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Expand Up @@ -94,9 +94,7 @@ - (BOOL)isEqual:(id)other

- (NSUInteger)hash
{
NSUInteger hash;
hash += _title.hash;
hash += _subtitle.hash;
NSUInteger hash = _title.hash + _subtitle.hash;
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Is this a safe way to compute the hash?

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A XOR over the values could improve it but I'm ok with it because this is an abstract class and can't be used directly. All concrete subclasses include the hash of the GeoJSON dictionary.

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@1ec5 1ec5 Jan 11, 2017 •
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This is a fairly conventional implementation, as far as I know. The only hard requirement for a -hash implementation is that two equal objects (as in -isEqual:) must have the same hash. But feel free to improve on the various -hash implementations in this SDK in a separate PR.

#if !TARGET_OS_IPHONE
hash += _toolTip.hash;
#endif
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8 changes: 2 additions & 6 deletions platform/ios/src/MGLAnnotationImage.m
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Expand Up @@ -57,15 +57,11 @@ - (BOOL)isEqual:(id)other {

return ((!_reuseIdentifier && !otherAnnotationImage.reuseIdentifier) || [_reuseIdentifier isEqualToString:otherAnnotationImage.reuseIdentifier])
&& _enabled == otherAnnotationImage.enabled
&& ((!_image && !otherAnnotationImage.image) || [UIImagePNGRepresentation(_image) isEqualToData:UIImagePNGRepresentation(otherAnnotationImage.image)]);
&& ((!_image && !otherAnnotationImage.image) || [_image isEqual:otherAnnotationImage.image]);
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@1ec5 1ec5 Jan 11, 2017 •
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@frederoni, any reason why comparing two UIImages for object equality isn’t good enough? (There’s a similar comparison of NSImages’ TIFF representations on the macOS side.)

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@1ec5 1ec5 Jan 11, 2017 •
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I see that testAnnotationImage() is failing as a result of my change. It’s true that drawing the image to a new context could make the two images unequal, but there are a number of reasons that would be the case anyways (such as different color profiles). In general, I don’t think a class’s -isEqual: implementation should be more thorough than the -isEqual: implementations of its ivars.

Edit: I misread the test. Looks like it’s doing something pretty ordinary.

}

- (NSUInteger)hash {
NSUInteger hash;
hash += [_reuseIdentifier hash];
hash += _enabled;
hash += [_image hash];
return hash;
return _reuseIdentifier.hash + _enabled + _image.hash;
}

- (void)setImage:(UIImage *)image {
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6 changes: 1 addition & 5 deletions platform/macos/src/MGLAnnotationImage.m
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Expand Up @@ -57,11 +57,7 @@ - (BOOL)isEqual:(id)other {
}

- (NSUInteger)hash {
NSUInteger hash;
hash += [_reuseIdentifier hash];
hash += _selectable;
hash += [_image hash];
return hash;
return _reuseIdentifier.hash + @(_selectable).hash + _image.hash;
}

@end
2 changes: 1 addition & 1 deletion platform/macos/src/NSImage+MGLAdditions.mm
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Expand Up @@ -6,7 +6,7 @@ - (nullable instancetype)initWithMGLSpriteImage:(const mbgl::SpriteImage *)sprit
std::string png = encodePNG(spriteImage->image);
NSData *data = [[NSData alloc] initWithBytes:png.data() length:png.size()];
NSBitmapImageRep *rep = [NSBitmapImageRep imageRepWithData:data];
if ([self initWithSize:NSMakeSize(spriteImage->getWidth(), spriteImage->getHeight())]) {
if (self = [self initWithSize:NSMakeSize(spriteImage->getWidth(), spriteImage->getHeight())]) {
[self addRepresentation:rep];
[self setTemplate:spriteImage->sdf];
}
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