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git-subtree-dir: submodules/AsyncDisplayKit git-subtree-mainline: d06f423e0ed3df1fed9bd10d79ee312a9179b632 git-subtree-split: 02bedc12816e251ad71777f9d2578329b6d2bef6
68 lines
2.3 KiB
Plaintext
68 lines
2.3 KiB
Plaintext
//
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// ASTraceEvent.mm
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// Texture
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//
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// Copyright (c) Facebook, Inc. and its affiliates. All rights reserved.
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// Changes after 4/13/2017 are: Copyright (c) Pinterest, Inc. All rights reserved.
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// Licensed under Apache 2.0: http://www.apache.org/licenses/LICENSE-2.0
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//
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#import <AsyncDisplayKit/ASTraceEvent.h>
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#import <QuartzCore/QuartzCore.h>
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static NSString *const ASTraceEventThreadDescriptionKey = @"ASThreadTraceEventDescription";
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@interface ASTraceEvent ()
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@property (nonatomic, readonly) NSString *objectDescription;
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@property (nonatomic, readonly) NSString *threadDescription;
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@end
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@implementation ASTraceEvent
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- (instancetype)initWithBacktrace:(NSArray<NSString *> *)backtrace format:(NSString *)format arguments:(va_list)args
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{
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self = [super init];
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if (self != nil) {
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static NSTimeInterval refTime;
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static dispatch_once_t onceToken;
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dispatch_once(&onceToken, ^{
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refTime = CACurrentMediaTime();
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});
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// Create the format string passed to us.
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_message = [[NSString alloc] initWithFormat:format arguments:args];
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NSThread *thread = [NSThread currentThread];
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NSString *threadDescription = thread.name;
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if (threadDescription.length == 0) {
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if ([thread isMainThread]) {
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threadDescription = @"Main";
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} else {
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// If the bg thread has no name, we cache a 4-character ptr string to identify it by
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// inside the thread dictionary.
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NSMutableDictionary *threadDict = thread.threadDictionary;
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threadDescription = threadDict[ASTraceEventThreadDescriptionKey];
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if (threadDescription == nil) {
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// Want these to be 4-chars to line up with "Main". It's possible that a collision could happen
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// here but it's so unbelievably likely to impact development, the risk is acceptable.
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NSString *ptrString = [NSString stringWithFormat:@"%p", thread];
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threadDescription = [ptrString substringFromIndex:MAX(0, ptrString.length - 4)];
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threadDict[ASTraceEventThreadDescriptionKey] = threadDescription;
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}
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}
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}
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_threadDescription = threadDescription;
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_backtrace = backtrace;
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_timestamp = CACurrentMediaTime() - refTime;
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}
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return self;
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}
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- (NSString *)description
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{
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return [NSString stringWithFormat:@"<(%@) t=%7.3f: %@>", _threadDescription, _timestamp, _message];
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}
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@end
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