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Ali
2019-11-14 01:14:35 +04:00
parent b2b2ab9c57
commit ca0668df3d
537 changed files with 165 additions and 55122 deletions
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submodules/AsyncDisplayKit/Source/ASMainThreadDeallocation.mm
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//
// ASMainThreadDeallocation.mm
// Texture
//
// Copyright (c) Pinterest, Inc. All rights reserved.
// Licensed under Apache 2.0: http://www.apache.org/licenses/LICENSE-2.0
//
#import <AsyncDisplayKit/ASMainThreadDeallocation.h>
#import <AsyncDisplayKit/ASBaseDefines.h>
#import <AsyncDisplayKit/ASDisplayNodeExtras.h>
#import "Private/ASInternalHelpers.h"
#import <AsyncDisplayKit/ASLog.h>
#import <AsyncDisplayKit/ASThread.h>
#import <objc/runtime.h>
#import <UIKit/UIKit.h>
@implementation NSObject (ASMainThreadIvarTeardown)
- (void)scheduleIvarsForMainThreadDeallocation
{
if (ASDisplayNodeThreadIsMain()) {
return;
}
NSValue *ivarsObj = [[self class] _ivarsThatMayNeedMainDeallocation];
// Unwrap the ivar array
unsigned int count = 0;
// Will be unused if assertions are disabled.
__unused int scanResult = sscanf(ivarsObj.objCType, "[%u^{objc_ivar}]", &count);
ASDisplayNodeAssert(scanResult == 1, @"Unexpected type in NSValue: %s", ivarsObj.objCType);
Ivar ivars[count];
[ivarsObj getValue:ivars];
for (Ivar ivar : ivars) {
id value = object_getIvar(self, ivar);
if (value == nil) {
continue;
}
if ([object_getClass(value) needsMainThreadDeallocation]) {
as_log_debug(ASMainThreadDeallocationLog(), "%@: Trampolining ivar '%s' value %@ for main deallocation.", self, ivar_getName(ivar), value);
// Release the ivar's reference before handing the object to the queue so we
// don't risk holding onto it longer than the queue does.
object_setIvar(self, ivar, nil);
ASPerformMainThreadDeallocation(&value);
} else {
as_log_debug(ASMainThreadDeallocationLog(), "%@: Not trampolining ivar '%s' value %@.", self, ivar_getName(ivar), value);
}
}
}
/**
* Returns an NSValue-wrapped array of all the ivars in this class or its superclasses
* up through ASDisplayNode, that we expect may need to be deallocated on main.
*
* This method caches its results.
*
* Result is of type NSValue<[Ivar]>
*/
+ (NSValue * _Nonnull)_ivarsThatMayNeedMainDeallocation NS_RETURNS_RETAINED
{
static NSCache<Class, NSValue *> *ivarsCache;
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
ivarsCache = [[NSCache alloc] init];
});
NSValue *result = [ivarsCache objectForKey:self];
if (result != nil) {
return result;
}
// Cache miss.
unsigned int resultCount = 0;
static const int kMaxDealloc2MainIvarsPerClassTree = 64;
Ivar resultIvars[kMaxDealloc2MainIvarsPerClassTree];
// Get superclass results first.
Class c = class_getSuperclass(self);
if (c != [NSObject class]) {
NSValue *ivarsObj = [c _ivarsThatMayNeedMainDeallocation];
// Unwrap the ivar array and append it to our working array
unsigned int count = 0;
// Will be unused if assertions are disabled.
__unused int scanResult = sscanf(ivarsObj.objCType, "[%u^{objc_ivar}]", &count);
ASDisplayNodeAssert(scanResult == 1, @"Unexpected type in NSValue: %s", ivarsObj.objCType);
ASDisplayNodeCAssert(resultCount + count < kMaxDealloc2MainIvarsPerClassTree, @"More than %d dealloc2main ivars are not supported. Count: %d", kMaxDealloc2MainIvarsPerClassTree, resultCount + count);
[ivarsObj getValue:resultIvars + resultCount];
resultCount += count;
}
// Now gather ivars from this particular class.
unsigned int allMyIvarsCount;
Ivar *allMyIvars = class_copyIvarList(self, &allMyIvarsCount);
for (NSUInteger i = 0; i < allMyIvarsCount; i++) {
Ivar ivar = allMyIvars[i];
// NOTE: Would be great to exclude weak/unowned ivars, since we don't
// release them. Unfortunately the objc_ivar_management access is private and
// class_getWeakIvarLayout does not have a well-defined structure.
const char *type = ivar_getTypeEncoding(ivar);
if (type != NULL && strcmp(type, @encode(id)) == 0) {
// If it's `id` we have to include it just in case.
resultIvars[resultCount] = ivar;
resultCount += 1;
as_log_verbose(ASMainThreadDeallocationLog(), "%@: Marking ivar '%s' for possible main deallocation due to type id", self, ivar_getName(ivar));
} else {
// If it's an ivar with a static type, check the type.
Class c = ASGetClassFromType(type);
if ([c needsMainThreadDeallocation]) {
resultIvars[resultCount] = ivar;
resultCount += 1;
as_log_verbose(ASMainThreadDeallocationLog(), "%@: Marking ivar '%s' for main deallocation due to class %@", self, ivar_getName(ivar), c);
} else {
as_log_verbose(ASMainThreadDeallocationLog(), "%@: Skipping ivar '%s' for main deallocation.", self, ivar_getName(ivar));
}
}
}
free(allMyIvars);
// Encode the type (array of Ivars) into a string and wrap it in an NSValue
char arrayType[32];
snprintf(arrayType, 32, "[%u^{objc_ivar}]", resultCount);
result = [NSValue valueWithBytes:resultIvars objCType:arrayType];
[ivarsCache setObject:result forKey:self];
return result;
}
@end
@implementation NSObject (ASNeedsMainThreadDeallocation)
+ (BOOL)needsMainThreadDeallocation
{
const auto name = class_getName(self);
if (0 == strncmp(name, "AV", 2) || 0 == strncmp(name, "UI", 2) || 0 == strncmp(name, "CA", 2)) {
return YES;
}
return NO;
}
@end
@implementation CALayer (ASNeedsMainThreadDeallocation)
+ (BOOL)needsMainThreadDeallocation
{
return YES;
}
@end
@implementation UIColor (ASNeedsMainThreadDeallocation)
+ (BOOL)needsMainThreadDeallocation
{
return NO;
}
@end
@implementation UIGestureRecognizer (ASNeedsMainThreadDeallocation)
+ (BOOL)needsMainThreadDeallocation
{
return YES;
}
@end
@implementation UIImage (ASNeedsMainThreadDeallocation)
+ (BOOL)needsMainThreadDeallocation
{
return NO;
}
@end
@implementation UIResponder (ASNeedsMainThreadDeallocation)
+ (BOOL)needsMainThreadDeallocation
{
return YES;
}
@end
@implementation NSProxy (ASNeedsMainThreadDeallocation)
+ (BOOL)needsMainThreadDeallocation
{
return NO;
}
@end