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Fix C# delegate calling conventions

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Summary:
When using CSS-Layout in a C# UWP project in x86, by default the MSVC compiler defaults the delegate calling convention to cdecl, while .NET assumes that all delegates are declared using stdcall.  This causes a problem when invoking such as this error:

```
Run-Time Check Failure #0 - The value of ESP was not properly saved across
a function call.  This is usually a result of calling a function declared with one
calling convention with a function pointer declared with a different calling
convention.
```

This PR changes the calling convention in the C# code to reflect cdecl by using the `UnmanagedFunctionPointer` attribute and setting the calling convention to `CallingConvention.Cdecl`.

```csharp
 [UnmanagedFunctionPointer(CallingConvention.Cdecl)]
  public delegate CSSSize CSSMeasureFunc(
        IntPtr context,
        float width,
        CSSMeasureMode widthMode,
        float height,
        CSSMeasureMode heightMode);
```

I have updated all calls as well to other functions.  I
Closes https://github.com/facebook/css-layout/pull/231

Reviewed By: emilsjolander

Differential Revision: D4063437

Pulled By: splhack

fbshipit-source-id: b1069a1b9f675d2623a64a1c5f3189292a18a646
This commit is contained in:
mattpodwysocki
2016-10-22 09:51:17 -07:00
committed by Facebook Github Bot
parent 7673de823f
commit 1488f822c3
4 changed files with 14 additions and 3 deletions
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11
csharp/Facebook.CSSLayout/Native.cs
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@@ -21,10 +21,12 @@ namespace Facebook.CSSLayout
#endif
[DllImport(DllName)]
public static extern void CSSInteropSetLogger(CSSLogger.Func func);
public static extern void CSSInteropSetLogger(
[MarshalAs(UnmanagedType.FunctionPtr)] CSSLogger.Func func);
[DllImport(DllName)]
public static extern void CSSAssertSetFailFunc(CSSAssert.FailFunc func);
public static extern void CSSAssertSetFailFunc(
[MarshalAs(UnmanagedType.FunctionPtr)] CSSAssert.FailFunc func);
[DllImport(DllName)]
public static extern IntPtr CSSNodeNew();
@@ -79,9 +81,12 @@ namespace Facebook.CSSLayout
public static extern IntPtr CSSNodeGetContext(IntPtr node);
[DllImport(DllName)]
public static extern void CSSNodeSetMeasureFunc(IntPtr node, CSSMeasureFunc measureFunc);
public static extern void CSSNodeSetMeasureFunc(
IntPtr node,
[MarshalAs(UnmanagedType.FunctionPtr)] CSSMeasureFunc measureFunc);
[DllImport(DllName)]
[return: MarshalAs(UnmanagedType.FunctionPtr)]
public static extern CSSMeasureFunc CSSNodeGetMeasureFunc(IntPtr node);
[DllImport(DllName)]