Make ASWeakMapEntry Value Atomic (#555)

* Make ASWeakMapEntry value atomic

* Increment changelog

* Go a little nuts

* Update CHANGELOG.md

CHANGELOG.md

@@ -17,6 +17,7 @@
 - [ASEditableTextNode] added -editableTextNodeShouldBeginEditing to ASEditableTextNodeDelegate to mirror the corresponding method from UITextViewDelegate. [Yan S.](https://github.com/yans) [#535](https://github.com/TextureGroup/Texture/pull/535)
 - [Breaking] Remove APIs that have been deprecated since 2.0 and/or for at least 6 months [Huy Nguyen](https://github.com/nguyenhuy) [#529](https://github.com/TextureGroup/Texture/pull/529)
 - [ASDisplayNode] Ensure `-displayWillStartAsynchronously:` and `-displayDidFinish` are invoked on rasterized subnodes.  [Eric Scheers](https://github.com/smeis) [#532](https://github.com/TextureGroup/Texture/pull/532)
+- Fixed a memory corruption issue in the ASImageNode display system. [Adlai Holler](https://github.com/Adlai-Holler) [#555](https://github.com/TextureGroup/Texture/pull/555)
 
 ##2.4
 - Fix an issue where inserting/deleting sections could lead to inconsistent supplementary element behavior. [Adlai Holler](https://github.com/Adlai-Holler)

Source/Private/ASWeakMap.h

@@ -28,7 +28,7 @@ NS_ASSUME_NONNULL_BEGIN
 AS_SUBCLASSING_RESTRICTED
 @interface ASWeakMapEntry<Value> : NSObject
 
-@property (nonatomic, retain, readonly) Value value;
+@property (atomic, strong, readonly) Value value;
 
 @end
 
@@ -49,7 +49,7 @@ AS_SUBCLASSING_RESTRICTED
  * The underlying storage is a hash table and the Key type should implement `hash` and `isEqual:`.
  */
 AS_SUBCLASSING_RESTRICTED
-@interface ASWeakMap<__covariant Key : NSObject *, Value> : NSObject
+@interface ASWeakMap<__covariant Key, Value> : NSObject
 
 /**
  * Read from the cache.  The Value object is accessible from the returned ASWeakMapEntry.

Source/Private/ASWeakMap.m

@@ -18,12 +18,13 @@
 #import <AsyncDisplayKit/ASWeakMap.h>
 
 @interface ASWeakMapEntry ()
-@property (nonatomic, strong) NSObject *key;
+@property (nonatomic, strong, readonly) id key;
+@property (atomic, strong) id value;
 @end
 
 @implementation ASWeakMapEntry
 
-- (instancetype)initWithKey:(NSObject *)key value:(NSObject *)value
+- (instancetype)initWithKey:(id)key value:(id)value
 {
   self = [super init];
   if (self) {
@@ -33,16 +34,11 @@
   return self;
 }
 
-- (void)setValue:(NSObject *)value
-{
-  _value = value;
-}
-
 @end
 
 
 @interface ASWeakMap ()
-@property (nonatomic, strong) NSMapTable<NSObject *, ASWeakMapEntry *> *hashTable;
+@property (nonatomic, strong, readonly) NSMapTable<id, ASWeakMapEntry *> *hashTable;
 @end
 
 /**
@@ -69,12 +65,12 @@
   return self;
 }
 
-- (ASWeakMapEntry *)entryForKey:(NSObject *)key
+- (ASWeakMapEntry *)entryForKey:(id)key
 {
   return [self.hashTable objectForKey:key];
 }
 
-- (ASWeakMapEntry *)setObject:(NSObject *)value forKey:(NSObject *)key
+- (ASWeakMapEntry *)setObject:(id)value forKey:(id)key
 {
   ASWeakMapEntry *entry = [self.hashTable objectForKey:key];
   if (entry != nil) {