Remove reliance on shared_ptr for ASDisplayNodeLayouts (#1131)

* Remove reliance on shared_ptr for ASDisplayNodeLayouts

* Fix up

* Fix in yoga

* Back to let

* Returns inner pointer

* Trivial change to kick the CI

AsyncDisplayKit.xcodeproj/project.pbxproj

@@ -148,7 +148,6 @@
 		6947B0C01E36B4E30007C478 /* ASStackUnpositionedLayout.mm in Sources */ = {isa = PBXBuildFile; fileRef = 6947B0BD1E36B4E30007C478 /* ASStackUnpositionedLayout.mm */; };
 		6947B0C31E36B5040007C478 /* ASStackPositionedLayout.h in Headers */ = {isa = PBXBuildFile; fileRef = 6947B0C11E36B5040007C478 /* ASStackPositionedLayout.h */; settings = {ATTRIBUTES = (Private, ); }; };
 		6947B0C51E36B5040007C478 /* ASStackPositionedLayout.mm in Sources */ = {isa = PBXBuildFile; fileRef = 6947B0C21E36B5040007C478 /* ASStackPositionedLayout.mm */; };
-		6959433F1D70815300B0EE1F /* ASDisplayNodeLayout.mm in Sources */ = {isa = PBXBuildFile; fileRef = 6959433C1D70815300B0EE1F /* ASDisplayNodeLayout.mm */; };
 		695943401D70815300B0EE1F /* ASDisplayNodeLayout.h in Headers */ = {isa = PBXBuildFile; fileRef = 6959433D1D70815300B0EE1F /* ASDisplayNodeLayout.h */; settings = {ATTRIBUTES = (Private, ); }; };
 		695BE2551DC1245C008E6EA5 /* ASWrapperSpecSnapshotTests.mm in Sources */ = {isa = PBXBuildFile; fileRef = 695BE2541DC1245C008E6EA5 /* ASWrapperSpecSnapshotTests.mm */; };
 		696F01EC1DD2AF450049FBD5 /* ASEventLog.h in Headers */ = {isa = PBXBuildFile; fileRef = 696F01EA1DD2AF450049FBD5 /* ASEventLog.h */; settings = {ATTRIBUTES = (Public, ); }; };
@@ -705,7 +704,6 @@
 		6947B0BD1E36B4E30007C478 /* ASStackUnpositionedLayout.mm */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.objcpp; path = ASStackUnpositionedLayout.mm; sourceTree = "<group>"; };
 		6947B0C11E36B5040007C478 /* ASStackPositionedLayout.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = ASStackPositionedLayout.h; sourceTree = "<group>"; };
 		6947B0C21E36B5040007C478 /* ASStackPositionedLayout.mm */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.objcpp; path = ASStackPositionedLayout.mm; sourceTree = "<group>"; };
-		6959433C1D70815300B0EE1F /* ASDisplayNodeLayout.mm */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.objcpp; path = ASDisplayNodeLayout.mm; sourceTree = "<group>"; };
 		6959433D1D70815300B0EE1F /* ASDisplayNodeLayout.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = ASDisplayNodeLayout.h; sourceTree = "<group>"; };
 		695BE2541DC1245C008E6EA5 /* ASWrapperSpecSnapshotTests.mm */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.objcpp; path = ASWrapperSpecSnapshotTests.mm; sourceTree = "<group>"; };
 		696F01EA1DD2AF450049FBD5 /* ASEventLog.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = ASEventLog.h; sourceTree = "<group>"; };
@@ -1490,7 +1488,6 @@
 				690BC8C020F6D3490052A434 /* ASDisplayNodeCornerLayerDelegate.m */,
 				058D0A0C195D050800B7D73C /* ASDisplayNodeInternal.h */,
 				6959433D1D70815300B0EE1F /* ASDisplayNodeLayout.h */,
-				6959433C1D70815300B0EE1F /* ASDisplayNodeLayout.mm */,
 				CCA282C61E9EB64B0037E8B7 /* ASDisplayNodeTipState.h */,
 				CCA282C71E9EB64B0037E8B7 /* ASDisplayNodeTipState.m */,
 				68B8A4DB1CBD911D007E4543 /* ASImageNode+AnimatedImagePrivate.h */,
@@ -2497,7 +2494,6 @@
 				DB78412E1C6BCE1600A9E2B4 /* _ASTransitionContext.m in Sources */,
 				B350620B1B010EFD0018CF92 /* ASTableView.mm in Sources */,
 				B350620E1B010EFD0018CF92 /* ASTextNode.mm in Sources */,
-				6959433F1D70815300B0EE1F /* ASDisplayNodeLayout.mm in Sources */,
 				68355B3E1CB57A60001D4E68 /* ASPINRemoteImageDownloader.m in Sources */,
 				CC034A141E649F1300626263 /* AsyncDisplayKit+IGListKitMethods.m in Sources */,
 				509E68661B3AEDD7009B9150 /* CoreGraphics+ASConvenience.m in Sources */,

CHANGELOG.md

@@ -49,6 +49,7 @@
 - Small optimization to the layout spec & yoga layout systems by eliminating array copies. [Adlai Holler](https://github.com/Adlai-Holler)
 - Optimize layout process by removing `ASRectMap`.  [Adlai Holler](https://github.com/Adlai-Holler)
 - Remove necessity to use view to access rangeController in ASTableNode, ASCollectionNode. [Michael Schneider](https://github.com/maicki)
+- Remove display node's reliance on shared_ptr. [Adlai Holler](https://github.com/Adlai-Holler)
 
 ## 2.7
 - Fix pager node for interface coalescing. [Max Wang](https://github.com/wsdwsd0829) [#877](https://github.com/TextureGroup/Texture/pull/877)

Source/ASDisplayNode+Layout.mm

@@ -70,19 +70,19 @@
 
   ASLayout *layout = nil;
   NSUInteger version = _layoutVersion;
-  if (_calculatedDisplayNodeLayout->isValid(constrainedSize, parentSize, version)) {
+  if (_calculatedDisplayNodeLayout.isValid(constrainedSize, parentSize, version)) {
-    ASDisplayNodeAssertNotNil(_calculatedDisplayNodeLayout->layout, @"-[ASDisplayNode layoutThatFits:parentSize:] _calculatedDisplayNodeLayout->layout should not be nil! %@", self);
+    ASDisplayNodeAssertNotNil(_calculatedDisplayNodeLayout.layout, @"-[ASDisplayNode layoutThatFits:parentSize:] _calculatedDisplayNodeLayout.layout should not be nil! %@", self);
-    layout = _calculatedDisplayNodeLayout->layout;
+    layout = _calculatedDisplayNodeLayout.layout;
-  } else if (_pendingDisplayNodeLayout != nullptr && _pendingDisplayNodeLayout->isValid(constrainedSize, parentSize, version)) {
+  } else if (_pendingDisplayNodeLayout.isValid(constrainedSize, parentSize, version)) {
-    ASDisplayNodeAssertNotNil(_pendingDisplayNodeLayout->layout, @"-[ASDisplayNode layoutThatFits:parentSize:] _pendingDisplayNodeLayout->layout should not be nil! %@", self);
+    ASDisplayNodeAssertNotNil(_pendingDisplayNodeLayout.layout, @"-[ASDisplayNode layoutThatFits:parentSize:] _pendingDisplayNodeLayout.layout should not be nil! %@", self);
-    layout = _pendingDisplayNodeLayout->layout;
+    layout = _pendingDisplayNodeLayout.layout;
   } else {
     // Create a pending display node layout for the layout pass
     layout = [self calculateLayoutThatFits:constrainedSize
                           restrictedToSize:self.style.size
                       relativeToParentSize:parentSize];
     as_log_verbose(ASLayoutLog(), "Established pending layout for %@ in %s", self, sel_getName(_cmd));
-    _pendingDisplayNodeLayout = std::make_shared<ASDisplayNodeLayout>(layout, constrainedSize, parentSize, version);
+    _pendingDisplayNodeLayout = ASDisplayNodeLayout(layout, constrainedSize, parentSize,version);
     ASDisplayNodeAssertNotNil(layout, @"-[ASDisplayNode layoutThatFits:parentSize:] newly calculated layout should not be nil! %@", self);
   }
   
@@ -156,16 +156,16 @@ ASLayoutElementStyleExtensibilityForwarding
 - (ASLayout *)calculatedLayout
 {
   ASDN::MutexLocker l(__instanceLock__);
-  return _calculatedDisplayNodeLayout->layout;
+  return _calculatedDisplayNodeLayout.layout;
 }
 
 - (CGSize)calculatedSize
 {
   ASDN::MutexLocker l(__instanceLock__);
-  if (_pendingDisplayNodeLayout != nullptr && _pendingDisplayNodeLayout->isValid(_layoutVersion)) {
+  if (_pendingDisplayNodeLayout.isValid(_layoutVersion)) {
-    return _pendingDisplayNodeLayout->layout.size;
+    return _pendingDisplayNodeLayout.layout.size;
   }
-  return _calculatedDisplayNodeLayout->layout.size;
+  return _calculatedDisplayNodeLayout.layout.size;
 }
 
 - (ASSizeRange)constrainedSizeForCalculatedLayout
@@ -177,10 +177,10 @@ ASLayoutElementStyleExtensibilityForwarding
 - (ASSizeRange)_locked_constrainedSizeForCalculatedLayout
 {
   ASAssertLocked(__instanceLock__);
-  if (_pendingDisplayNodeLayout != nullptr && _pendingDisplayNodeLayout->isValid(_layoutVersion)) {
+  if (_pendingDisplayNodeLayout.isValid(_layoutVersion)) {
-    return _pendingDisplayNodeLayout->constrainedSize;
+    return _pendingDisplayNodeLayout.constrainedSize;
   }
-  return _calculatedDisplayNodeLayout->constrainedSize;
+  return _calculatedDisplayNodeLayout.constrainedSize;
 }
 
 @end
@@ -246,10 +246,10 @@ ASLayoutElementStyleExtensibilityForwarding
 
   // Figure out constrainedSize to use
   ASSizeRange constrainedSize = ASSizeRangeMake(boundsSizeForLayout);
-  if (_pendingDisplayNodeLayout != nullptr) {
+  if (_pendingDisplayNodeLayout.layout != nil) {
-    constrainedSize = _pendingDisplayNodeLayout->constrainedSize;
+    constrainedSize = _pendingDisplayNodeLayout.constrainedSize;
-  } else if (_calculatedDisplayNodeLayout->layout != nil) {
+  } else if (_calculatedDisplayNodeLayout.layout != nil) {
-    constrainedSize = _calculatedDisplayNodeLayout->constrainedSize;
+    constrainedSize = _calculatedDisplayNodeLayout.constrainedSize;
   }
 
   __instanceLock__.unlock();
@@ -305,20 +305,20 @@ ASLayoutElementStyleExtensibilityForwarding
     // Prefer a newer and not yet applied _pendingDisplayNodeLayout over _calculatedDisplayNodeLayout
     // If there is no such _pending, check if _calculated is valid to reuse (avoiding recalculation below).
     BOOL pendingLayoutIsPreferred = NO;
-    if (_pendingDisplayNodeLayout != nullptr && _pendingDisplayNodeLayout->isValid(_layoutVersion)) {
+    if (_pendingDisplayNodeLayout.isValid(_layoutVersion)) {
-      NSUInteger calculatedVersion = _calculatedDisplayNodeLayout->version;
+      NSUInteger calculatedVersion = _calculatedDisplayNodeLayout.version;
-      NSUInteger pendingVersion = _pendingDisplayNodeLayout->version;
+      NSUInteger pendingVersion = _pendingDisplayNodeLayout.version;
       if (pendingVersion > calculatedVersion) {
         pendingLayoutIsPreferred = YES; // Newer _pending
       } else if (pendingVersion == calculatedVersion
-                 && !ASSizeRangeEqualToSizeRange(_pendingDisplayNodeLayout->constrainedSize,
+                 && !ASSizeRangeEqualToSizeRange(_pendingDisplayNodeLayout.constrainedSize,
-                                                 _calculatedDisplayNodeLayout->constrainedSize)) {
+                                                 _calculatedDisplayNodeLayout.constrainedSize)) {
                    pendingLayoutIsPreferred = YES; // _pending with a different constrained size
                  }
     }
-    BOOL calculatedLayoutIsReusable = (_calculatedDisplayNodeLayout->isValid(_layoutVersion)
+    BOOL calculatedLayoutIsReusable = (_calculatedDisplayNodeLayout.isValid(_layoutVersion)
-                                       && (_calculatedDisplayNodeLayout->requestedLayoutFromAbove
+                                       && (_calculatedDisplayNodeLayout.requestedLayoutFromAbove
-                                           || CGSizeEqualToSize(_calculatedDisplayNodeLayout->layout.size, boundsSizeForLayout)));
+                                           || CGSizeEqualToSize(_calculatedDisplayNodeLayout.layout.size, boundsSizeForLayout)));
     if (!pendingLayoutIsPreferred && calculatedLayoutIsReusable) {
       return;
     }
@@ -341,15 +341,15 @@ ASLayoutElementStyleExtensibilityForwarding
     }
 
     // Figure out previous and pending layouts for layout transition
-    std::shared_ptr<ASDisplayNodeLayout> nextLayout = _pendingDisplayNodeLayout;
+    ASDisplayNodeLayout nextLayout = _pendingDisplayNodeLayout;
-    #define layoutSizeDifferentFromBounds !CGSizeEqualToSize(nextLayout->layout.size, boundsSizeForLayout)
+    #define layoutSizeDifferentFromBounds !CGSizeEqualToSize(nextLayout.layout.size, boundsSizeForLayout)
 
     // nextLayout was likely created by a call to layoutThatFits:, check if it is valid and can be applied.
     // If our bounds size is different than it, or invalid, recalculate.  Use #define to avoid nullptr->
     BOOL pendingLayoutApplicable = NO;
-    if (nextLayout == nullptr) {
+    if (nextLayout.layout == nil) {
       as_log_verbose(ASLayoutLog(), "No pending layout.");
-    } else if (nextLayout->isValid(_layoutVersion) == NO) {
+    } else if (!nextLayout.isValid(_layoutVersion)) {
       as_log_verbose(ASLayoutLog(), "Pending layout is stale.");
     } else if (layoutSizeDifferentFromBounds) {
       as_log_verbose(ASLayoutLog(), "Pending layout size %@ doesn't match bounds size.", NSStringFromCGSize(nextLayout->layout.size));
@@ -366,10 +366,10 @@ ASLayoutElementStyleExtensibilityForwarding
       ASLayout *layout = [self calculateLayoutThatFits:constrainedSize
                                       restrictedToSize:self.style.size
                                   relativeToParentSize:boundsSizeForLayout];
-      nextLayout = std::make_shared<ASDisplayNodeLayout>(layout, constrainedSize, boundsSizeForLayout, version);
+      nextLayout = ASDisplayNodeLayout(layout, constrainedSize, boundsSizeForLayout, version);
       // Now that the constrained size of pending layout might have been reused, the layout is useless
       // Release it and any orphaned subnodes it retains
-      _pendingDisplayNodeLayout = nullptr;
+      _pendingDisplayNodeLayout.layout = nil;
     }
 
     if (didCreateNewContext) {
@@ -378,8 +378,8 @@ ASLayoutElementStyleExtensibilityForwarding
 
     // If our new layout's desired size for self doesn't match current size, ask our parent to update it.
     // This can occur for either pre-calculated or newly-calculated layouts.
-    if (nextLayout->requestedLayoutFromAbove == NO
+    if (nextLayout.requestedLayoutFromAbove == NO
-        && CGSizeEqualToSize(boundsSizeForLayout, nextLayout->layout.size) == NO) {
+        && CGSizeEqualToSize(boundsSizeForLayout, nextLayout.layout.size) == NO) {
       as_log_verbose(ASLayoutLog(), "Layout size doesn't match bounds size. Requesting layout from above.");
       // The layout that we have specifies that this node (self) would like to be a different size
       // than it currently is.  Because that size has been computed within the constrainedSize, we
@@ -387,7 +387,7 @@ ASLayoutElementStyleExtensibilityForwarding
       // However, in some cases apps may manually interfere with this (setting a different bounds).
       // In this case, we need to detect that we've already asked to be resized to match this
       // particular ASLayout object, and shouldn't loop asking again unless we have a different ASLayout.
-      nextLayout->requestedLayoutFromAbove = YES;
+      nextLayout.requestedLayoutFromAbove = YES;
 
       {
         ASDN::MutexUnlocker u(__instanceLock__);
@@ -396,11 +396,11 @@ ASLayoutElementStyleExtensibilityForwarding
 
       // Update the layout's version here because _u_setNeedsLayoutFromAbove calls __setNeedsLayout which in turn increases _layoutVersion
       // Failing to do this will cause the layout to be invalid immediately
-      nextLayout->version = _layoutVersion;
+      nextLayout.version = _layoutVersion;
     }
 
     // Prepare to transition to nextLayout
-    ASDisplayNodeAssertNotNil(nextLayout->layout, @"nextLayout->layout should not be nil! %@", self);
+    ASDisplayNodeAssertNotNil(nextLayout.layout, @"nextLayout->layout should not be nil! %@", self);
     _pendingLayoutTransition = [[ASLayoutTransition alloc] initWithNode:self
                                                           pendingLayout:nextLayout
                                                          previousLayout:_calculatedDisplayNodeLayout];
@@ -431,17 +431,16 @@ ASLayoutElementStyleExtensibilityForwarding
   CGSize boundsSizeForLayout = ASCeilSizeValues(self.threadSafeBounds.size);
 
   // Checkout if constrained size of pending or calculated display node layout can be used
-  if (_pendingDisplayNodeLayout != nullptr
+  if (_pendingDisplayNodeLayout.requestedLayoutFromAbove
-      && (_pendingDisplayNodeLayout->requestedLayoutFromAbove
+          || CGSizeEqualToSize(_pendingDisplayNodeLayout.layout.size, boundsSizeForLayout)) {
-          || CGSizeEqualToSize(_pendingDisplayNodeLayout->layout.size, boundsSizeForLayout))) {
     // We assume the size from the last returned layoutThatFits: layout was applied so use the pending display node
     // layout constrained size
-    return _pendingDisplayNodeLayout->constrainedSize;
+    return _pendingDisplayNodeLayout.constrainedSize;
-  } else if (_calculatedDisplayNodeLayout->layout != nil
+  } else if (_calculatedDisplayNodeLayout.layout != nil
-             && (_calculatedDisplayNodeLayout->requestedLayoutFromAbove
+             && (_calculatedDisplayNodeLayout.requestedLayoutFromAbove
-                 || CGSizeEqualToSize(_calculatedDisplayNodeLayout->layout.size, boundsSizeForLayout))) {
+                 || CGSizeEqualToSize(_calculatedDisplayNodeLayout.layout.size, boundsSizeForLayout))) {
     // We assume the  _calculatedDisplayNodeLayout is still valid and the frame is not different
-    return _calculatedDisplayNodeLayout->constrainedSize;
+    return _calculatedDisplayNodeLayout.constrainedSize;
   } else {
     // In this case neither the _pendingDisplayNodeLayout or the _calculatedDisplayNodeLayout constrained size can
     // be reused, so the current bounds is used. This is usual the case if a frame was set manually that differs to
@@ -458,10 +457,10 @@ ASLayoutElementStyleExtensibilityForwarding
   ASLayout *layout;
   {
     ASDN::MutexLocker l(__instanceLock__);
-    if (_calculatedDisplayNodeLayout->version < _layoutVersion) {
+    if (_calculatedDisplayNodeLayout.version < _layoutVersion) {
       return;
     }
-    layout = _calculatedDisplayNodeLayout->layout;
+    layout = _calculatedDisplayNodeLayout.layout;
   }
   
   for (ASDisplayNode *node in self.subnodes) {
@@ -654,10 +653,10 @@ ASLayoutElementStyleExtensibilityForwarding
         
         // Update calculated layout
         let previousLayout = _calculatedDisplayNodeLayout;
-        let pendingLayout = std::make_shared<ASDisplayNodeLayout>(newLayout,
+        let pendingLayout = ASDisplayNodeLayout(newLayout,
-                                                                  constrainedSize,
+                                                constrainedSize,
-                                                                  constrainedSize.max,
+                                                constrainedSize.max,
-                                                                  newLayoutVersion);
+                                                newLayoutVersion);
         [self _locked_setCalculatedDisplayNodeLayout:pendingLayout];
         
         // Setup pending layout transition for animation
@@ -869,7 +868,7 @@ ASLayoutElementStyleExtensibilityForwarding
 {
   ASAssertUnlocked(__instanceLock__);
 
-  ASLayoutTransition *pendingLayoutTransition = nil;
+  ASLayoutTransition *pendingLayoutTransition;
   {
     ASDN::MutexLocker l(__instanceLock__);
     pendingLayoutTransition = _pendingLayoutTransition;
@@ -918,7 +917,7 @@ ASLayoutElementStyleExtensibilityForwarding
   }
 
   NSArray *subnodes = [self subnodes];
-  NSArray *sublayouts = _calculatedDisplayNodeLayout->layout.sublayouts;
+  NSArray *sublayouts = _calculatedDisplayNodeLayout.layout.sublayouts;
 
   let currentSubnodes = [[NSHashTable alloc] initWithOptions:NSHashTableObjectPointerPersonality
                                                      capacity:subnodes.count];
@@ -970,8 +969,7 @@ ASLayoutElementStyleExtensibilityForwarding
   if (_placeholderEnabled && !_placeholderImage && [self _locked_displaysAsynchronously]) {
     
     // Zero-sized nodes do not require a placeholder.
-    ASLayout *layout = _calculatedDisplayNodeLayout->layout;
+    CGSize layoutSize = _calculatedDisplayNodeLayout.layout.size;
-    CGSize layoutSize = (layout ? layout.size : CGSizeZero);
     if (layoutSize.width * layoutSize.height <= 0.0) {
       return;
     }
@@ -995,26 +993,26 @@ ASLayoutElementStyleExtensibilityForwarding
   _pendingLayoutTransition = nil;
 }
 
-- (void)_setCalculatedDisplayNodeLayout:(std::shared_ptr<ASDisplayNodeLayout>)displayNodeLayout
+- (void)_setCalculatedDisplayNodeLayout:(const ASDisplayNodeLayout &)displayNodeLayout
 {
   ASDN::MutexLocker l(__instanceLock__);
   [self _locked_setCalculatedDisplayNodeLayout:displayNodeLayout];
 }
 
-- (void)_locked_setCalculatedDisplayNodeLayout:(std::shared_ptr<ASDisplayNodeLayout>)displayNodeLayout
+- (void)_locked_setCalculatedDisplayNodeLayout:(const ASDisplayNodeLayout &)displayNodeLayout
 {
   ASAssertLocked(__instanceLock__);
-  ASDisplayNodeAssertTrue(displayNodeLayout->layout.layoutElement == self);
+  ASDisplayNodeAssertTrue(displayNodeLayout.layout.layoutElement == self);
-  ASDisplayNodeAssertTrue(displayNodeLayout->layout.size.width >= 0.0);
+  ASDisplayNodeAssertTrue(displayNodeLayout.layout.size.width >= 0.0);
-  ASDisplayNodeAssertTrue(displayNodeLayout->layout.size.height >= 0.0);
+  ASDisplayNodeAssertTrue(displayNodeLayout.layout.size.height >= 0.0);
+  
+  _calculatedDisplayNodeLayout = displayNodeLayout;
   
   // Flatten the layout if it wasn't done before (@see -calculateLayoutThatFits:).
   if ([ASDisplayNode shouldStoreUnflattenedLayouts]) {
-    _unflattenedLayout = displayNodeLayout->layout;
+    _unflattenedLayout = _calculatedDisplayNodeLayout.layout; 
-    displayNodeLayout->layout = [_unflattenedLayout filteredNodeLayoutTree];
+    _calculatedDisplayNodeLayout.layout = [_unflattenedLayout filteredNodeLayoutTree];
   }
-
-  _calculatedDisplayNodeLayout = displayNodeLayout;
 }
 
 @end

Source/ASDisplayNode+Yoga.mm

@@ -209,7 +209,7 @@
     // For the root node in a Yoga tree, make sure to preserve the constrainedSize originally provided.
     // This will be used for all relayouts triggered by children, since they escalate to root.
     ASSizeRange range = parentNode ? ASSizeRangeUnconstrained : self.constrainedSizeForCalculatedLayout;
-    _pendingDisplayNodeLayout = std::make_shared<ASDisplayNodeLayout>(layout, range, parentSize, _layoutVersion);
+    _pendingDisplayNodeLayout = ASDisplayNodeLayout(layout, range, parentSize, _layoutVersion);
   }
 }
 

Source/ASDisplayNode.mm

@@ -292,8 +292,6 @@ static ASDisplayNodeMethodOverrides GetASDisplayNodeMethodOverrides(Class c)
   
   _primitiveTraitCollection = ASPrimitiveTraitCollectionMakeDefault();
   
-  _calculatedDisplayNodeLayout = std::make_shared<ASDisplayNodeLayout>();
-  _pendingDisplayNodeLayout = nullptr;
   _layoutVersion = 1;
   
   _defaultLayoutTransitionDuration = 0.2;
@@ -3812,21 +3810,19 @@ ASDISPLAYNODE_INLINE BOOL subtreeIsRasterized(ASDisplayNode *node) {
   [props addObject:@{ @"layoutVersion": @(_layoutVersion.load()) }];
   [props addObject:@{ @"bounds": [NSValue valueWithCGRect:self.bounds] }];
 
-  if (_calculatedDisplayNodeLayout != nullptr) {
+  if (_calculatedDisplayNodeLayout.layout) {
-    ASDisplayNodeLayout c = *_calculatedDisplayNodeLayout;
+    [props addObject:@{ @"calculatedLayout": _calculatedDisplayNodeLayout.layout }];
-    [props addObject:@{ @"calculatedLayout": c.layout }];
+    [props addObject:@{ @"calculatedVersion": @(_calculatedDisplayNodeLayout.version) }];
-    [props addObject:@{ @"calculatedVersion": @(c.version) }];
+    [props addObject:@{ @"calculatedConstrainedSize" : NSStringFromASSizeRange(_calculatedDisplayNodeLayout.constrainedSize) }];
-    [props addObject:@{ @"calculatedConstrainedSize" : NSStringFromASSizeRange(c.constrainedSize) }];
+    if (_calculatedDisplayNodeLayout.requestedLayoutFromAbove) {
-    if (c.requestedLayoutFromAbove) {
       [props addObject:@{ @"calculatedRequestedLayoutFromAbove": @"YES" }];
     }
   }
-  if (_pendingDisplayNodeLayout != nullptr) {
+  if (_pendingDisplayNodeLayout.layout) {
-    ASDisplayNodeLayout p = *_pendingDisplayNodeLayout;
+    [props addObject:@{ @"pendingLayout": _pendingDisplayNodeLayout.layout }];
-    [props addObject:@{ @"pendingLayout": p.layout }];
+    [props addObject:@{ @"pendingVersion": @(_pendingDisplayNodeLayout.version) }];
-    [props addObject:@{ @"pendingVersion": @(p.version) }];
+    [props addObject:@{ @"pendingConstrainedSize" : NSStringFromASSizeRange(_pendingDisplayNodeLayout.constrainedSize) }];
-    [props addObject:@{ @"pendingConstrainedSize" : NSStringFromASSizeRange(p.constrainedSize) }];
+    if (_pendingDisplayNodeLayout.requestedLayoutFromAbove) {
-    if (p.requestedLayoutFromAbove) {
       [props addObject:@{ @"pendingRequestedLayoutFromAbove": (id)kCFNull }];
     }
   }

Source/Private/ASDisplayNodeInternal.h

@@ -164,8 +164,8 @@ AS_EXTERN NSString * const ASRenderingEngineDidDisplayNodesScheduledBeforeTimest
   
   std::atomic<int32_t> _pendingTransitionID;
   ASLayoutTransition *_pendingLayoutTransition;
-  std::shared_ptr<ASDisplayNodeLayout> _calculatedDisplayNodeLayout;
+  ASDisplayNodeLayout _calculatedDisplayNodeLayout;
-  std::shared_ptr<ASDisplayNodeLayout> _pendingDisplayNodeLayout;
+  ASDisplayNodeLayout _pendingDisplayNodeLayout;
   
   /// Sentinel for layout data. Incremented when we get -setNeedsLayout / -invalidateCalculatedLayout.
   /// Starts at 1.

Source/Private/ASDisplayNodeLayout.h

@@ -43,10 +43,16 @@ struct ASDisplayNodeLayout {
   /**
    * Returns whether this is valid for a given version
    */
-  BOOL isValid(NSUInteger version);
+  BOOL isValid(NSUInteger versionArg) {
+    return layout != nil && version >= versionArg;
+  }
 
   /**
    * Returns whether this is valid for a given constrained size, parent size, and version
    */
-  BOOL isValid(ASSizeRange constrainedSize, CGSize parentSize, NSUInteger version);
+  BOOL isValid(ASSizeRange theConstrainedSize, CGSize theParentSize, NSUInteger versionArg) {
+    return isValid(versionArg)
+    && CGSizeEqualToSize(parentSize, theParentSize)
+    && ASSizeRangeEqualToSizeRange(constrainedSize, theConstrainedSize);
+  }
 };

Source/Private/ASDisplayNodeLayout.mm

@@ -1,22 +0,0 @@
-//
-//  ASDisplayNodeLayout.mm
-//  Texture
-//
-//  Copyright (c) Facebook, Inc. and its affiliates.  All rights reserved.
-//  Changes after 4/13/2017 are: Copyright (c) Pinterest, Inc.  All rights reserved.
-//  Licensed under Apache 2.0: http://www.apache.org/licenses/LICENSE-2.0
-//
-
-#import <AsyncDisplayKit/ASDisplayNodeLayout.h>
-
-BOOL ASDisplayNodeLayout::isValid(NSUInteger versionArg)
-{
-  return layout != nil && version >= versionArg;
-}
-
-BOOL ASDisplayNodeLayout::isValid(ASSizeRange theConstrainedSize, CGSize theParentSize, NSUInteger versionArg)
-{
-  return isValid(versionArg)
-      && CGSizeEqualToSize(parentSize, theParentSize)
-      && ASSizeRangeEqualToSizeRange(constrainedSize, theConstrainedSize);
-}

Source/Private/ASLayoutTransition.h

@@ -15,8 +15,6 @@
 #import <AsyncDisplayKit/ASDisplayNode.h>
 #import <AsyncDisplayKit/ASLayoutSpec.h>
 
-#import <memory>
-
 NS_ASSUME_NONNULL_BEGIN
 
 #pragma mark - ASLayoutElementTransition
@@ -52,12 +50,12 @@ AS_SUBCLASSING_RESTRICTED
 /**
  * Previous layout to transition from
  */
-@property (nonatomic, readonly) std::shared_ptr<ASDisplayNodeLayout> previousLayout;
+@property (nonatomic, readonly) const ASDisplayNodeLayout &previousLayout NS_RETURNS_INNER_POINTER;
 
 /**
  * Pending layout to transition to
  */
-@property (nonatomic, readonly) std::shared_ptr<ASDisplayNodeLayout> pendingLayout;
+@property (nonatomic, readonly) const ASDisplayNodeLayout &pendingLayout NS_RETURNS_INNER_POINTER;
 
 /**
  * Returns if the layout transition needs to happen synchronously
@@ -68,8 +66,8 @@ AS_SUBCLASSING_RESTRICTED
  * Returns a newly initialized layout transition
  */
 - (instancetype)initWithNode:(ASDisplayNode *)node
-               pendingLayout:(std::shared_ptr<ASDisplayNodeLayout>)pendingLayout
+               pendingLayout:(const ASDisplayNodeLayout &)pendingLayout
-              previousLayout:(std::shared_ptr<ASDisplayNodeLayout>)previousLayout NS_DESIGNATED_INITIALIZER;
+              previousLayout:(const ASDisplayNodeLayout &)previousLayout NS_DESIGNATED_INITIALIZER;
 
 /**
  * Insert and remove subnodes that were added or removed between the previousLayout and the pendingLayout

Source/Private/ASLayoutTransition.mm

@@ -60,11 +60,13 @@ static inline BOOL ASLayoutCanTransitionAsynchronous(ASLayout *layout) {
   NSArray<ASDisplayNode *> *_removedSubnodes;
   std::vector<NSUInteger> _insertedSubnodePositions;
   std::vector<std::pair<ASDisplayNode *, NSUInteger>> _subnodeMoves;
+  ASDisplayNodeLayout _pendingLayout;
+  ASDisplayNodeLayout _previousLayout;
 }
 
 - (instancetype)initWithNode:(ASDisplayNode *)node
-               pendingLayout:(std::shared_ptr<ASDisplayNodeLayout>)pendingLayout
+               pendingLayout:(const ASDisplayNodeLayout &)pendingLayout
-              previousLayout:(std::shared_ptr<ASDisplayNodeLayout>)previousLayout
+              previousLayout:(const ASDisplayNodeLayout &)previousLayout
 {
   self = [super init];
   if (self) {
@@ -80,7 +82,7 @@ static inline BOOL ASLayoutCanTransitionAsynchronous(ASLayout *layout) {
 - (BOOL)isSynchronous
 {
   ASDN::MutexSharedLocker l(__instanceLock__);
-  return !ASLayoutCanTransitionAsynchronous(_pendingLayout->layout);
+  return !ASLayoutCanTransitionAsynchronous(_pendingLayout.layout);
 }
 
 - (void)commitTransition
@@ -156,8 +158,8 @@ static inline BOOL ASLayoutCanTransitionAsynchronous(ASLayout *layout) {
   
   // Create an activity even if no subnodes affected.
   as_activity_create_for_scope("Calculate subnode operations");
-  ASLayout *previousLayout = _previousLayout->layout;
+  ASLayout *previousLayout = _previousLayout.layout;
-  ASLayout *pendingLayout = _pendingLayout->layout;
+  ASLayout *pendingLayout = _pendingLayout.layout;
 
   if (previousLayout) {
 #if AS_IG_LIST_KIT
@@ -226,9 +228,9 @@ static inline BOOL ASLayoutCanTransitionAsynchronous(ASLayout *layout) {
 {
   ASDN::MutexSharedLocker l(__instanceLock__);
   if ([key isEqualToString:ASTransitionContextFromLayoutKey]) {
-    return _previousLayout->layout;
+    return _previousLayout.layout;
   } else if ([key isEqualToString:ASTransitionContextToLayoutKey]) {
-    return _pendingLayout->layout;
+    return _pendingLayout.layout;
   } else {
     return nil;
   }
@@ -238,9 +240,9 @@ static inline BOOL ASLayoutCanTransitionAsynchronous(ASLayout *layout) {
 {
   ASDN::MutexSharedLocker l(__instanceLock__);
   if ([key isEqualToString:ASTransitionContextFromLayoutKey]) {
-    return _previousLayout->constrainedSize;
+    return _previousLayout.constrainedSize;
   } else if ([key isEqualToString:ASTransitionContextToLayoutKey]) {
-    return _pendingLayout->constrainedSize;
+    return _pendingLayout.constrainedSize;
   } else {
     return ASSizeRangeMake(CGSizeZero, CGSizeZero);
   }