Workaround for P/Invoke AccessViolationException

Summary:
The issue is on ARM builds for Windows UWP. For the C# P/Invoke API wrapper, any native method that returns the YogaValue struct throws the AccessViolationException. The issue is not with structs in general, as returning the YogaSize / YGSize struct works fine. The issue seems to be limited to structs that have an enum member.

I tried a number of things to resolve the issue without changing the underlying native API for Windows. I read the ARM documentation and saw reference to variable enum sizes based on the number of enum members, so I tried to use a number of different UnmanagedType values in a [MarsalAs()] attribute on the enum member of the C# struct declaration.

What ultimately worked was to return a pointer to the location of the struct, and use the System.Runtime.InteropServices.PtrToStructure API to read the struct data from that pointer. I added a few new macros that will return the struct address on Windows only, other builds are not affected.

Note, I have not tested the impact of this ch
Closes https://github.com/facebook/yoga/pull/459

Reviewed By: emilsjolander

Differential Revision: D4652278

Pulled By: splhack

fbshipit-source-id: bf7ada4da1781e3f813b3ba331974b7bded476d9

csharp/Facebook.Yoga/Native.cs

@@ -12,6 +12,12 @@ using System.Runtime.InteropServices;
 
 namespace Facebook.Yoga
 {
+#if WINDOWS_UWP_ARM
+    using YogaValueType = IntPtr;
+#else
+    using YogaValueType = YogaValue;
+#endif
+
     internal static class Native
     {
 #if (UNITY_IOS && !UNITY_EDITOR) || __IOS__
@@ -172,7 +178,7 @@ namespace Facebook.Yoga
         [DllImport(DllName, ExactSpelling = true, CallingConvention = CallingConvention.Cdecl)]
         public static extern void YGNodeCopyStyle(YGNodeHandle dstNode, YGNodeHandle srcNode);
 
-        #region YG_NODE_PROPERTY
+#region YG_NODE_PROPERTY
 
         [DllImport(DllName, ExactSpelling = true, CallingConvention = CallingConvention.Cdecl)]
         public static extern void YGNodeSetMeasureFunc(
@@ -193,9 +199,9 @@ namespace Facebook.Yoga
         [return: MarshalAs(UnmanagedType.I1)]
         public static extern bool YGNodeGetHasNewLayout(YGNodeHandle node);
 
-        #endregion
+#endregion
 
-        #region YG_NODE_STYLE_PROPERTY
+#region YG_NODE_STYLE_PROPERTY
 
         [DllImport(DllName, ExactSpelling = true, CallingConvention = CallingConvention.Cdecl)]
         public static extern void YGNodeStyleSetDirection(YGNodeHandle node, YogaDirection direction);
@@ -282,7 +288,7 @@ namespace Facebook.Yoga
         public static extern void YGNodeStyleSetFlexBasisAuto(YGNodeHandle node);
 
         [DllImport(DllName, ExactSpelling = true, CallingConvention = CallingConvention.Cdecl)]
-        public static extern YogaValue YGNodeStyleGetFlexBasis(YGNodeHandle node);
+        public static extern YogaValueType YGNodeStyleGetFlexBasis(YGNodeHandle node);
 
         [DllImport(DllName, ExactSpelling = true, CallingConvention = CallingConvention.Cdecl)]
         public static extern void YGNodeStyleSetWidth(YGNodeHandle node, float width);
@@ -294,7 +300,7 @@ namespace Facebook.Yoga
         public static extern void YGNodeStyleSetWidthAuto(YGNodeHandle node);
 
         [DllImport(DllName, ExactSpelling = true, CallingConvention = CallingConvention.Cdecl)]
-        public static extern YogaValue YGNodeStyleGetWidth(YGNodeHandle node);
+        public static extern YogaValueType YGNodeStyleGetWidth(YGNodeHandle node);
 
         [DllImport(DllName, ExactSpelling = true, CallingConvention = CallingConvention.Cdecl)]
         public static extern void YGNodeStyleSetHeight(YGNodeHandle node, float height);
@@ -306,7 +312,7 @@ namespace Facebook.Yoga
         public static extern void YGNodeStyleSetHeightAuto(YGNodeHandle node);
 
         [DllImport(DllName, ExactSpelling = true, CallingConvention = CallingConvention.Cdecl)]
-        public static extern YogaValue YGNodeStyleGetHeight(YGNodeHandle node);
+        public static extern YogaValueType YGNodeStyleGetHeight(YGNodeHandle node);
 
         [DllImport(DllName, ExactSpelling = true, CallingConvention = CallingConvention.Cdecl)]
         public static extern void YGNodeStyleSetMinWidth(YGNodeHandle node, float minWidth);
@@ -315,7 +321,7 @@ namespace Facebook.Yoga
         public static extern void YGNodeStyleSetMinWidthPercent(YGNodeHandle node, float minWidth);
 
         [DllImport(DllName, ExactSpelling = true, CallingConvention = CallingConvention.Cdecl)]
-        public static extern YogaValue YGNodeStyleGetMinWidth(YGNodeHandle node);
+        public static extern YogaValueType YGNodeStyleGetMinWidth(YGNodeHandle node);
 
         [DllImport(DllName, ExactSpelling = true, CallingConvention = CallingConvention.Cdecl)]
         public static extern void YGNodeStyleSetMinHeight(YGNodeHandle node, float minHeight);
@@ -324,7 +330,7 @@ namespace Facebook.Yoga
         public static extern void YGNodeStyleSetMinHeightPercent(YGNodeHandle node, float minHeight);
 
         [DllImport(DllName, ExactSpelling = true, CallingConvention = CallingConvention.Cdecl)]
-        public static extern YogaValue YGNodeStyleGetMinHeight(YGNodeHandle node);
+        public static extern YogaValueType YGNodeStyleGetMinHeight(YGNodeHandle node);
 
         [DllImport(DllName, ExactSpelling = true, CallingConvention = CallingConvention.Cdecl)]
         public static extern void YGNodeStyleSetMaxWidth(YGNodeHandle node, float maxWidth);
@@ -333,7 +339,7 @@ namespace Facebook.Yoga
         public static extern void YGNodeStyleSetMaxWidthPercent(YGNodeHandle node, float maxWidth);
 
         [DllImport(DllName, ExactSpelling = true, CallingConvention = CallingConvention.Cdecl)]
-        public static extern YogaValue YGNodeStyleGetMaxWidth(YGNodeHandle node);
+        public static extern YogaValueType YGNodeStyleGetMaxWidth(YGNodeHandle node);
 
         [DllImport(DllName, ExactSpelling = true, CallingConvention = CallingConvention.Cdecl)]
         public static extern void YGNodeStyleSetMaxHeight(YGNodeHandle node, float maxHeight);
@@ -342,7 +348,7 @@ namespace Facebook.Yoga
         public static extern void YGNodeStyleSetMaxHeightPercent(YGNodeHandle node, float maxHeight);
 
         [DllImport(DllName, ExactSpelling = true, CallingConvention = CallingConvention.Cdecl)]
-        public static extern YogaValue YGNodeStyleGetMaxHeight(YGNodeHandle node);
+        public static extern YogaValueType YGNodeStyleGetMaxHeight(YGNodeHandle node);
 
         [DllImport(DllName, ExactSpelling = true, CallingConvention = CallingConvention.Cdecl)]
         public static extern void YGNodeStyleSetAspectRatio(YGNodeHandle node, float aspectRatio);
@@ -350,9 +356,9 @@ namespace Facebook.Yoga
         [DllImport(DllName, ExactSpelling = true, CallingConvention = CallingConvention.Cdecl)]
         public static extern float YGNodeStyleGetAspectRatio(YGNodeHandle node);
 
-        #endregion
+#endregion
 
-        #region YG_NODE_STYLE_EDGE_PROPERTY
+#region YG_NODE_STYLE_EDGE_PROPERTY
 
         [DllImport(DllName, ExactSpelling = true, CallingConvention = CallingConvention.Cdecl)]
         public static extern void YGNodeStyleSetPosition(YGNodeHandle node, YogaEdge edge, float position);
@@ -361,7 +367,7 @@ namespace Facebook.Yoga
         public static extern void YGNodeStyleSetPositionPercent(YGNodeHandle node, YogaEdge edge, float position);
 
         [DllImport(DllName, ExactSpelling = true, CallingConvention = CallingConvention.Cdecl)]
-        public static extern YogaValue YGNodeStyleGetPosition(YGNodeHandle node, YogaEdge edge);
+        public static extern YogaValueType YGNodeStyleGetPosition(YGNodeHandle node, YogaEdge edge);
 
         [DllImport(DllName, ExactSpelling = true, CallingConvention = CallingConvention.Cdecl)]
         public static extern void YGNodeStyleSetMargin(YGNodeHandle node, YogaEdge edge, float margin);
@@ -373,7 +379,7 @@ namespace Facebook.Yoga
         public static extern void YGNodeStyleSetMarginAuto(YGNodeHandle node, YogaEdge edge);
 
         [DllImport(DllName, ExactSpelling = true, CallingConvention = CallingConvention.Cdecl)]
-        public static extern YogaValue YGNodeStyleGetMargin(YGNodeHandle node, YogaEdge edge);
+        public static extern YogaValueType YGNodeStyleGetMargin(YGNodeHandle node, YogaEdge edge);
 
         [DllImport(DllName, ExactSpelling = true, CallingConvention = CallingConvention.Cdecl)]
         public static extern void YGNodeStyleSetPadding(YGNodeHandle node, YogaEdge edge, float padding);
@@ -382,7 +388,7 @@ namespace Facebook.Yoga
         public static extern void YGNodeStyleSetPaddingPercent(YGNodeHandle node, YogaEdge edge, float padding);
 
         [DllImport(DllName, ExactSpelling = true, CallingConvention = CallingConvention.Cdecl)]
-        public static extern YogaValue YGNodeStyleGetPadding(YGNodeHandle node, YogaEdge edge);
+        public static extern YogaValueType YGNodeStyleGetPadding(YGNodeHandle node, YogaEdge edge);
 
         [DllImport(DllName, ExactSpelling = true, CallingConvention = CallingConvention.Cdecl)]
         public static extern void YGNodeStyleSetBorder(YGNodeHandle node, YogaEdge edge, float border);
@@ -390,9 +396,9 @@ namespace Facebook.Yoga
         [DllImport(DllName, ExactSpelling = true, CallingConvention = CallingConvention.Cdecl)]
         public static extern float YGNodeStyleGetBorder(YGNodeHandle node, YogaEdge edge);
 
-        #endregion
+#endregion
 
-        #region YG_NODE_LAYOUT_PROPERTY
+#region YG_NODE_LAYOUT_PROPERTY
 
         [DllImport(DllName, ExactSpelling = true, CallingConvention = CallingConvention.Cdecl)]
         public static extern float YGNodeLayoutGetLeft(YGNodeHandle node);
@@ -421,9 +427,9 @@ namespace Facebook.Yoga
         [DllImport(DllName, ExactSpelling = true, CallingConvention = CallingConvention.Cdecl)]
         public static extern YogaDirection YGNodeLayoutGetDirection(YGNodeHandle node);
 
-        #endregion
+#endregion
 
-        #region IOS
+#region IOS
 
 #if (UNITY_IOS && !UNITY_EDITOR) || __IOS__
         [DllImport(DllName, ExactSpelling = true, CallingConvention = CallingConvention.Cdecl)]
@@ -433,6 +439,6 @@ namespace Facebook.Yoga
         public static extern void YGNodeSetContext(IntPtr node, IntPtr managed);
 #endif
 
-        #endregion
+#endregion
     }
 }

csharp/Facebook.Yoga/YogaNode.Spacing.cs

@@ -7,8 +7,6 @@
  * of patent rights can be found in the PATENTS file in the same directory.
  */
 
-using System;
-
 namespace Facebook.Yoga
 {
     public partial class YogaNode
@@ -17,7 +15,7 @@ namespace Facebook.Yoga
         {
             get
             {
-                return Native.YGNodeStyleGetPosition(_ygNode, YogaEdge.Left);
+                return YogaValue.MarshalValue(Native.YGNodeStyleGetPosition(_ygNode, YogaEdge.Left));
             }
 
             set
@@ -30,7 +28,7 @@ namespace Facebook.Yoga
         {
             get
             {
-                return Native.YGNodeStyleGetPosition(_ygNode, YogaEdge.Top);
+                return YogaValue.MarshalValue(Native.YGNodeStyleGetPosition(_ygNode, YogaEdge.Top));
             }
 
             set
@@ -43,7 +41,7 @@ namespace Facebook.Yoga
         {
             get
             {
-                return Native.YGNodeStyleGetPosition(_ygNode, YogaEdge.Right);
+                return YogaValue.MarshalValue(Native.YGNodeStyleGetPosition(_ygNode, YogaEdge.Right));
             }
 
             set
@@ -56,7 +54,7 @@ namespace Facebook.Yoga
         {
             get
             {
-                return Native.YGNodeStyleGetPosition(_ygNode, YogaEdge.Bottom);
+                return YogaValue.MarshalValue(Native.YGNodeStyleGetPosition(_ygNode, YogaEdge.Bottom));
             }
 
             set
@@ -69,7 +67,7 @@ namespace Facebook.Yoga
         {
             get
             {
-                return Native.YGNodeStyleGetPosition(_ygNode, YogaEdge.Start);
+                return YogaValue.MarshalValue(Native.YGNodeStyleGetPosition(_ygNode, YogaEdge.Start));
             }
 
             set
@@ -82,7 +80,7 @@ namespace Facebook.Yoga
         {
             get
             {
-                return Native.YGNodeStyleGetPosition(_ygNode, YogaEdge.End);
+                return YogaValue.MarshalValue(Native.YGNodeStyleGetPosition(_ygNode, YogaEdge.End));
             }
 
             set
@@ -107,7 +105,7 @@ namespace Facebook.Yoga
         {
             get
             {
-                return Native.YGNodeStyleGetMargin(_ygNode, YogaEdge.Left);
+                return YogaValue.MarshalValue(Native.YGNodeStyleGetMargin(_ygNode, YogaEdge.Left));
             }
 
             set
@@ -120,7 +118,7 @@ namespace Facebook.Yoga
         {
             get
             {
-                return Native.YGNodeStyleGetMargin(_ygNode, YogaEdge.Top);
+                return YogaValue.MarshalValue(Native.YGNodeStyleGetMargin(_ygNode, YogaEdge.Top));
             }
 
             set
@@ -133,7 +131,7 @@ namespace Facebook.Yoga
         {
             get
             {
-                return Native.YGNodeStyleGetMargin(_ygNode, YogaEdge.Right);
+                return YogaValue.MarshalValue(Native.YGNodeStyleGetMargin(_ygNode, YogaEdge.Right));
             }
 
             set
@@ -146,7 +144,7 @@ namespace Facebook.Yoga
         {
             get
             {
-                return Native.YGNodeStyleGetMargin(_ygNode, YogaEdge.Bottom);
+                return YogaValue.MarshalValue(Native.YGNodeStyleGetMargin(_ygNode, YogaEdge.Bottom));
             }
 
             set
@@ -159,7 +157,7 @@ namespace Facebook.Yoga
         {
             get
             {
-                return Native.YGNodeStyleGetMargin(_ygNode, YogaEdge.Start);
+                return YogaValue.MarshalValue(Native.YGNodeStyleGetMargin(_ygNode, YogaEdge.Start));
             }
 
             set
@@ -172,7 +170,7 @@ namespace Facebook.Yoga
         {
             get
             {
-                return Native.YGNodeStyleGetMargin(_ygNode, YogaEdge.End);
+                return YogaValue.MarshalValue(Native.YGNodeStyleGetMargin(_ygNode, YogaEdge.End));
             }
 
             set
@@ -185,7 +183,7 @@ namespace Facebook.Yoga
         {
             get
             {
-                return Native.YGNodeStyleGetMargin(_ygNode, YogaEdge.Horizontal);
+                return YogaValue.MarshalValue(Native.YGNodeStyleGetMargin(_ygNode, YogaEdge.Horizontal));
             }
 
             set
@@ -198,7 +196,7 @@ namespace Facebook.Yoga
         {
             get
             {
-                return Native.YGNodeStyleGetMargin(_ygNode, YogaEdge.Vertical);
+                return YogaValue.MarshalValue(Native.YGNodeStyleGetMargin(_ygNode, YogaEdge.Vertical));
             }
 
             set
@@ -211,7 +209,7 @@ namespace Facebook.Yoga
         {
             get
             {
-                return Native.YGNodeStyleGetMargin(_ygNode, YogaEdge.All);
+                return YogaValue.MarshalValue(Native.YGNodeStyleGetMargin(_ygNode, YogaEdge.All));
             }
 
             set
@@ -240,7 +238,7 @@ namespace Facebook.Yoga
         {
             get
             {
-                return Native.YGNodeStyleGetPadding(_ygNode, YogaEdge.Left);
+                return YogaValue.MarshalValue(Native.YGNodeStyleGetPadding(_ygNode, YogaEdge.Left));
             }
 
             set
@@ -253,7 +251,7 @@ namespace Facebook.Yoga
         {
             get
             {
-                return Native.YGNodeStyleGetPadding(_ygNode, YogaEdge.Top);
+                return YogaValue.MarshalValue(Native.YGNodeStyleGetPadding(_ygNode, YogaEdge.Top));
             }
 
             set
@@ -266,7 +264,7 @@ namespace Facebook.Yoga
         {
             get
             {
-                return Native.YGNodeStyleGetPadding(_ygNode, YogaEdge.Right);
+                return YogaValue.MarshalValue(Native.YGNodeStyleGetPadding(_ygNode, YogaEdge.Right));
             }
 
             set
@@ -279,7 +277,7 @@ namespace Facebook.Yoga
         {
             get
             {
-                return Native.YGNodeStyleGetPadding(_ygNode, YogaEdge.Bottom);
+                return YogaValue.MarshalValue(Native.YGNodeStyleGetPadding(_ygNode, YogaEdge.Bottom));
             }
 
             set
@@ -292,7 +290,7 @@ namespace Facebook.Yoga
         {
             get
             {
-                return Native.YGNodeStyleGetPadding(_ygNode, YogaEdge.Start);
+                return YogaValue.MarshalValue(Native.YGNodeStyleGetPadding(_ygNode, YogaEdge.Start));
             }
 
             set
@@ -305,7 +303,7 @@ namespace Facebook.Yoga
         {
             get
             {
-                return Native.YGNodeStyleGetPadding(_ygNode, YogaEdge.End);
+                return YogaValue.MarshalValue(Native.YGNodeStyleGetPadding(_ygNode, YogaEdge.End));
             }
 
             set
@@ -318,7 +316,7 @@ namespace Facebook.Yoga
         {
             get
             {
-                return Native.YGNodeStyleGetPadding(_ygNode, YogaEdge.Horizontal);
+                return YogaValue.MarshalValue(Native.YGNodeStyleGetPadding(_ygNode, YogaEdge.Horizontal));
             }
 
             set
@@ -331,7 +329,7 @@ namespace Facebook.Yoga
         {
             get
             {
-                return Native.YGNodeStyleGetPadding(_ygNode, YogaEdge.Vertical);
+                return YogaValue.MarshalValue(Native.YGNodeStyleGetPadding(_ygNode, YogaEdge.Vertical));
             }
 
             set
@@ -344,7 +342,7 @@ namespace Facebook.Yoga
         {
             get
             {
-                return Native.YGNodeStyleGetPadding(_ygNode, YogaEdge.All);
+                return YogaValue.MarshalValue(Native.YGNodeStyleGetPadding(_ygNode, YogaEdge.All));
             }
 
             set

csharp/Facebook.Yoga/YogaNode.cs

@@ -318,7 +318,7 @@ namespace Facebook.Yoga
         {
             get
             {
-                return Native.YGNodeStyleGetFlexBasis(_ygNode);
+                return YogaValue.MarshalValue(Native.YGNodeStyleGetFlexBasis(_ygNode));
             }
 
             set
@@ -342,7 +342,7 @@ namespace Facebook.Yoga
         {
             get
             {
-                return Native.YGNodeStyleGetWidth(_ygNode);
+                return YogaValue.MarshalValue(Native.YGNodeStyleGetWidth(_ygNode));
             }
 
             set
@@ -366,7 +366,7 @@ namespace Facebook.Yoga
         {
             get
             {
-                return Native.YGNodeStyleGetHeight(_ygNode);
+                return YogaValue.MarshalValue(Native.YGNodeStyleGetHeight(_ygNode));
             }
 
             set
@@ -390,7 +390,7 @@ namespace Facebook.Yoga
         {
             get
             {
-                return Native.YGNodeStyleGetMaxWidth(_ygNode);
+                return YogaValue.MarshalValue(Native.YGNodeStyleGetMaxWidth(_ygNode));
             }
 
             set
@@ -410,7 +410,7 @@ namespace Facebook.Yoga
         {
             get
             {
-                return Native.YGNodeStyleGetMaxHeight(_ygNode);
+                return YogaValue.MarshalValue(Native.YGNodeStyleGetMaxHeight(_ygNode));
             }
 
             set
@@ -430,7 +430,7 @@ namespace Facebook.Yoga
         {
             get
             {
-                return Native.YGNodeStyleGetMinWidth(_ygNode);
+                return YogaValue.MarshalValue(Native.YGNodeStyleGetMinWidth(_ygNode));
             }
 
             set
@@ -450,7 +450,7 @@ namespace Facebook.Yoga
         {
             get
             {
-                return Native.YGNodeStyleGetMinHeight(_ygNode);
+                return YogaValue.MarshalValue(Native.YGNodeStyleGetMinHeight(_ygNode));
             }
 
             set

csharp/Facebook.Yoga/YogaValue.cs

@@ -7,6 +7,7 @@
  * of patent rights can be found in the PATENTS file in the same directory.
  */
 
+using System;
 using System.Runtime.InteropServices;
 
 namespace Facebook.Yoga
@@ -92,5 +93,17 @@ namespace Facebook.Yoga
         {
             return Point(pointValue);
         }
+
+#if WINDOWS_UWP_ARM
+        internal static YogaValue MarshalValue(IntPtr ptr)
+        {
+            return Marshal.PtrToStructure<YogaValue>(ptr);
+        }
+#else
+        internal static YogaValue MarshalValue(YogaValue value)
+        {
+            return value;
+        }
+#endif
     }
 }

csharp/Windows/Facebook.Yoga.Universal.sln

@@ -7,7 +7,7 @@ Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "Tests", "Tests", "{5289E508
 EndProject
 Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "Native", "Native", "{51A8E803-C084-431F-9130-F277481C2BB2}"
 EndProject
-Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "NETStandard", "NETStandard", "{DCF7899B-A487-49C0-BCDE-DC088B6750C2}"
+Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "Universal", "Universal", "{1048DB7D-9B95-48CA-B43E-D9C35AB1DCD4}"
 EndProject
 Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "yoga.uwp", "..\Yoga\Yoga.Universal.vcxproj", "{2EACF721-73B5-46AE-9775-4A8674D05A9C}"
 EndProject
@@ -15,7 +15,7 @@ Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "Shared", "Shared", "{39A2FF
 EndProject
 Project("{D954291E-2A0B-460D-934E-DC6B0785DB48}") = "Facebook.Yoga.Shared", "..\Facebook.Yoga\Facebook.Yoga.Shared.shproj", "{91C42D32-291D-4B72-90B4-551663D60B8B}"
 EndProject
-Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Facebook.Yoga", "Facebook.Yoga\Facebook.Yoga.csproj", "{3AACE384-FDEC-4D91-A3B2-EEB21B46C9AD}"
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Facebook.Yoga.Universal", "Facebook.Yoga.Universal\Facebook.Yoga.Universal.csproj", "{D6477AD6-9EDD-4EBA-8C60-CD31F77C52C6}"
 	ProjectSection(ProjectDependencies) = postProject
 		{2EACF721-73B5-46AE-9775-4A8674D05A9C} = {2EACF721-73B5-46AE-9775-4A8674D05A9C}
 	EndProjectSection
@@ -26,7 +26,7 @@ Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Facebook.Yoga.Universal.Tes
 EndProject
 Global
 	GlobalSection(SharedMSBuildProjectFiles) = preSolution
-		..\Facebook.Yoga\Facebook.Yoga.Shared.projitems*{3aace384-fdec-4d91-a3b2-eeb21b46c9ad}*SharedItemsImports = 4
+		..\Facebook.Yoga\Facebook.Yoga.Shared.projitems*{d6477ad6-9edd-4eba-8c60-cd31f77c52c6}*SharedItemsImports = 4
 		..\tests\Facebook.Yoga\Facebook.Yoga.Shared.Tests.projitems*{4edc82d9-a201-4831-8fe0-98f468f8e4ae}*SharedItemsImports = 13
 		..\Facebook.Yoga\Facebook.Yoga.Shared.projitems*{91c42d32-291d-4b72-90b4-551663d60b8b}*SharedItemsImports = 13
 	EndGlobalSection
@@ -55,22 +55,21 @@ Global
 		{2EACF721-73B5-46AE-9775-4A8674D05A9C}.Release|x64.Build.0 = Release|x64
 		{2EACF721-73B5-46AE-9775-4A8674D05A9C}.Release|x86.ActiveCfg = Release|Win32
 		{2EACF721-73B5-46AE-9775-4A8674D05A9C}.Release|x86.Build.0 = Release|Win32
-		{3AACE384-FDEC-4D91-A3B2-EEB21B46C9AD}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{D6477AD6-9EDD-4EBA-8C60-CD31F77C52C6}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
-		{3AACE384-FDEC-4D91-A3B2-EEB21B46C9AD}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{D6477AD6-9EDD-4EBA-8C60-CD31F77C52C6}.Debug|Any CPU.Build.0 = Debug|Any CPU
-		{3AACE384-FDEC-4D91-A3B2-EEB21B46C9AD}.Debug|ARM.ActiveCfg = Debug|ARM
+		{D6477AD6-9EDD-4EBA-8C60-CD31F77C52C6}.Debug|ARM.ActiveCfg = Debug|ARM
-		{3AACE384-FDEC-4D91-A3B2-EEB21B46C9AD}.Debug|ARM.Build.0 = Debug|ARM
+		{D6477AD6-9EDD-4EBA-8C60-CD31F77C52C6}.Debug|ARM.Build.0 = Debug|ARM
-		{3AACE384-FDEC-4D91-A3B2-EEB21B46C9AD}.Debug|x64.ActiveCfg = Debug|x64
+		{D6477AD6-9EDD-4EBA-8C60-CD31F77C52C6}.Debug|x64.ActiveCfg = Debug|x64
-		{3AACE384-FDEC-4D91-A3B2-EEB21B46C9AD}.Debug|x64.Build.0 = Debug|x64
+		{D6477AD6-9EDD-4EBA-8C60-CD31F77C52C6}.Debug|x64.Build.0 = Debug|x64
-		{3AACE384-FDEC-4D91-A3B2-EEB21B46C9AD}.Debug|x86.ActiveCfg = Debug|x86
+		{D6477AD6-9EDD-4EBA-8C60-CD31F77C52C6}.Debug|x86.ActiveCfg = Debug|x86
-		{3AACE384-FDEC-4D91-A3B2-EEB21B46C9AD}.Debug|x86.Build.0 = Debug|x86
+		{D6477AD6-9EDD-4EBA-8C60-CD31F77C52C6}.Debug|x86.Build.0 = Debug|x86
-		{3AACE384-FDEC-4D91-A3B2-EEB21B46C9AD}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{D6477AD6-9EDD-4EBA-8C60-CD31F77C52C6}.Release|Any CPU.ActiveCfg = Release|Any CPU
-		{3AACE384-FDEC-4D91-A3B2-EEB21B46C9AD}.Release|Any CPU.Build.0 = Release|Any CPU
+		{D6477AD6-9EDD-4EBA-8C60-CD31F77C52C6}.Release|Any CPU.Build.0 = Release|Any CPU
-		{3AACE384-FDEC-4D91-A3B2-EEB21B46C9AD}.Release|ARM.ActiveCfg = Release|ARM
+		{D6477AD6-9EDD-4EBA-8C60-CD31F77C52C6}.Release|ARM.ActiveCfg = Release|ARM
-		{3AACE384-FDEC-4D91-A3B2-EEB21B46C9AD}.Release|ARM.Build.0 = Release|ARM
+		{D6477AD6-9EDD-4EBA-8C60-CD31F77C52C6}.Release|ARM.Build.0 = Release|ARM
-		{3AACE384-FDEC-4D91-A3B2-EEB21B46C9AD}.Release|x64.ActiveCfg = Release|x64
+		{D6477AD6-9EDD-4EBA-8C60-CD31F77C52C6}.Release|x64.ActiveCfg = Release|x64
-		{3AACE384-FDEC-4D91-A3B2-EEB21B46C9AD}.Release|x64.Build.0 = Release|x64
+		{D6477AD6-9EDD-4EBA-8C60-CD31F77C52C6}.Release|x64.Build.0 = Release|x64
-		{3AACE384-FDEC-4D91-A3B2-EEB21B46C9AD}.Release|x86.ActiveCfg = Release|x86
+		{D6477AD6-9EDD-4EBA-8C60-CD31F77C52C6}.Release|x86.ActiveCfg = Release|x86
-		{3AACE384-FDEC-4D91-A3B2-EEB21B46C9AD}.Release|x86.Build.0 = Release|x86
 		{0C76D2FE-6767-44FE-B03D-21B2076BAA73}.Debug|Any CPU.ActiveCfg = Debug|x86
 		{0C76D2FE-6767-44FE-B03D-21B2076BAA73}.Debug|ARM.ActiveCfg = Debug|ARM
 		{0C76D2FE-6767-44FE-B03D-21B2076BAA73}.Debug|ARM.Build.0 = Debug|ARM
@@ -98,7 +97,7 @@ Global
 	GlobalSection(NestedProjects) = preSolution
 		{2EACF721-73B5-46AE-9775-4A8674D05A9C} = {51A8E803-C084-431F-9130-F277481C2BB2}
 		{91C42D32-291D-4B72-90B4-551663D60B8B} = {39A2FFDA-C093-4FA6-8143-45B5019E7DAC}
-		{3AACE384-FDEC-4D91-A3B2-EEB21B46C9AD} = {DCF7899B-A487-49C0-BCDE-DC088B6750C2}
+		{D6477AD6-9EDD-4EBA-8C60-CD31F77C52C6} = {1048DB7D-9B95-48CA-B43E-D9C35AB1DCD4}
 		{4EDC82D9-A201-4831-8FE0-98F468F8E4AE} = {39A2FFDA-C093-4FA6-8143-45B5019E7DAC}
 		{0C76D2FE-6767-44FE-B03D-21B2076BAA73} = {5289E508-8386-45A1-A12B-258A5899CD45}
 	EndGlobalSection

csharp/Yoga/Yoga.Universal.vcxproj

@@ -159,7 +159,7 @@
       </PrecompiledHeader>
       <WarningLevel>Level3</WarningLevel>
       <Optimization>Disabled</Optimization>
-      <PreprocessorDefinitions>WIN32;_DEBUG;_WINDOWS;_USRDLL;YOGA_EXPORTS;FB_ASSERTIONS_ENABLED=0;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <PreprocessorDefinitions>WINARMDLL;WIN32;_DEBUG;_WINDOWS;_USRDLL;YOGA_EXPORTS;FB_ASSERTIONS_ENABLED=0;%(PreprocessorDefinitions)</PreprocessorDefinitions>
       <SDLCheck>true</SDLCheck>
       <AdditionalIncludeDirectories>$(ProjectDir)..\..\;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
       <CompileAsWinRT>false</CompileAsWinRT>
@@ -210,7 +210,7 @@
       <Optimization>MaxSpeed</Optimization>
       <FunctionLevelLinking>true</FunctionLevelLinking>
       <IntrinsicFunctions>true</IntrinsicFunctions>
-      <PreprocessorDefinitions>WIN32;NDEBUG;_WINDOWS;_USRDLL;YOGA_EXPORTS;FB_ASSERTIONS_ENABLED=0;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <PreprocessorDefinitions>WINARMDLL;WIN32;NDEBUG;_WINDOWS;_USRDLL;YOGA_EXPORTS;FB_ASSERTIONS_ENABLED=0;%(PreprocessorDefinitions)</PreprocessorDefinitions>
       <SDLCheck>true</SDLCheck>
       <AdditionalIncludeDirectories>$(ProjectDir)..\..\;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
       <CompileAsWinRT>false</CompileAsWinRT>

yoga/YGMacros.h

@@ -23,6 +23,14 @@
 #define WIN_EXPORT
 #endif
 
+#ifdef WINARMDLL
+#define WIN_STRUCT(type) type*
+#define WIN_STRUCT_REF(value) &value
+#else
+#define WIN_STRUCT(type) type
+#define WIN_STRUCT_REF(value) value
+#endif
+
 #ifndef FB_ASSERTIONS_ENABLED
 #define FB_ASSERTIONS_ENABLED 1
 #endif

yoga/Yoga.c

@@ -613,8 +613,8 @@ static inline const YGValue *YGNodeResolveFlexBasisPtr(const YGNodeRef node) {
     }                                                                                         \
   }                                                                                           \
                                                                                               \
-  type YGNodeStyleGet##name(const YGNodeRef node, const YGEdge edge) {                        \
+  WIN_STRUCT(type) YGNodeStyleGet##name(const YGNodeRef node, const YGEdge edge) {            \
-    return node->style.instanceName[edge];                                                    \
+    return WIN_STRUCT_REF(node->style.instanceName[edge]);                                    \
   }
 
 #define YG_NODE_STYLE_EDGE_PROPERTY_IMPL(type, name, paramName, instanceName)                 \

yoga/Yoga.h

@@ -141,7 +141,7 @@ WIN_EXPORT void YGNodeCopyStyle(const YGNodeRef dstNode, const YGNodeRef srcNode
   WIN_EXPORT void YGNodeStyleSet##name##Percent(const YGNodeRef node,   \
                                                 const YGEdge edge,      \
                                                 const float paramName); \
-  WIN_EXPORT type YGNodeStyleGet##name(const YGNodeRef node, const YGEdge edge);
+  WIN_EXPORT WIN_STRUCT(type) YGNodeStyleGet##name(const YGNodeRef node, const YGEdge edge);
 
 #define YG_NODE_STYLE_EDGE_PROPERTY_UNIT_AUTO(type, name) \
   WIN_EXPORT void YGNodeStyleSet##name##Auto(const YGNodeRef node, const YGEdge edge);