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Code Issues 690 Packages Projects Releases 20 Wiki Activity

Don't try to use the MT pointer on unsupported platforms

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This commit is contained in:
Miha Zupan
2022-04-22 20:36:52 +02:00
parent b32e71aaeb
commit e8f9274b64
1 changed files with 39 additions and 4 deletions
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43
src/Markdig/Renderers/RendererBase.cs
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@@ -4,7 +4,9 @@
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Runtime.CompilerServices;
using System.Runtime.InteropServices;
using Markdig.Helpers;
using Markdig.Syntax;
using Markdig.Syntax.Inlines;
@@ -180,17 +182,50 @@ namespace Markdig.Renderers
private static KeyWrapper GetKeyForType(MarkdownObject obj)
{
#if NET
IntPtr methodTablePtr = Unsafe.Add(ref Unsafe.As<RawData>(obj).Data, -1);
return new KeyWrapper(methodTablePtr);
#else
if (s_canUseMethodTablePointer)
{
IntPtr methodTablePtr = Unsafe.Add(ref Unsafe.As<RawData>(obj).Data, -1);
return new KeyWrapper(methodTablePtr);
}
#endif
IntPtr typeHandle = Type.GetTypeHandle(obj).Value;
return new KeyWrapper(typeHandle);
#endif
}
#if NET
private sealed class RawData
{
public IntPtr Data;
}
private static readonly bool s_canUseMethodTablePointer = GetCanUseMethodTablePointer();
private static bool GetCanUseMethodTablePointer()
{
if (RuntimeInformation.OSArchitecture == Architecture.Wasm)
{
return false;
}
var obj1 = new LiteralInline();
var obj2 = new ParagraphBlock();
var obj3 = new LiteralInline();
IntPtr ptr1 = Unsafe.Add(ref Unsafe.As<RawData>(obj1).Data, -1);
IntPtr ptr2 = Unsafe.Add(ref Unsafe.As<RawData>(obj2).Data, -1);
IntPtr ptr3 = Unsafe.Add(ref Unsafe.As<RawData>(obj3).Data, -1);
GC.KeepAlive(obj1);
GC.KeepAlive(obj2);
GC.KeepAlive(obj3);
if (ptr1 == ptr2 || ptr1 != ptr3)
{
Debug.Fail("This platform doesn't support the MT pointer optimization");
return false;
}
return true;
}
#endif
}
}