Merge pull request #54 from Sergio0694/dev/disable-runtime-marshalling

Add [DisableRuntimeMarshalling] polyfill

README.md

@@ -69,6 +69,7 @@ It also includes the following optional runtime-supported polyfills:
   - `[UnsupportedOSPlatform]`
   - `[UnsupportedOSPlatformGuard]`
 - `[SuppressGCTransition]` (see [here](https://devblogs.microsoft.com/dotnet/improvements-in-native-code-interop-in-net-5-0/))
+- `[DisableRuntimeMarshalling]` (see [here](https://learn.microsoft.com/dotnet/standard/native-interop/disabled-marshalling))
 
 # Options ⚙️
 

src/PolySharp.Package/README.md

@@ -67,6 +67,7 @@ It also includes the following optional runtime-supported polyfills:
   - `[UnsupportedOSPlatform]`
   - `[UnsupportedOSPlatformGuard]`
 - `[SuppressGCTransition]` (see [here](https://devblogs.microsoft.com/dotnet/improvements-in-native-code-interop-in-net-5-0/))
+- `[DisableRuntimeMarshalling]` (see [here](https://learn.microsoft.com/dotnet/standard/native-interop/disabled-marshalling))
 
 # Options ⚙️
 

src/PolySharp.SourceGenerators/EmbeddedResources/RuntimeSupported/System.Runtime.CompilerServices.DisableRuntimeMarshallingAttribute.cs

@@ -0,0 +1,31 @@
+// <auto-generated/>
+#pragma warning disable
+#nullable enable annotations
+
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
+namespace System.Runtime.CompilerServices
+{
+    /// <summary>
+    /// Disables the built-in runtime managed/unmanaged marshalling subsystem for
+    /// P/Invokes, Delegate types, and unmanaged function pointer invocations.
+    /// </summary>
+    /// <remarks>
+    /// The built-in marshalling subsystem has some behaviors that cannot be changed due to
+    /// backward-compatibility requirements. This attribute allows disabling the built-in
+    /// subsystem and instead uses the following rules for P/Invokes, Delegates,
+    /// and unmanaged function pointer invocations:
+    ///
+    /// - All value types that do not contain reference type fields recursively (<c>unmanaged</c> in C#) are blittable
+    /// - Value types that recursively have any fields that have <c>[StructLayout(LayoutKind.Auto)]</c> are disallowed from interop.
+    /// - All reference types are disallowed from usage in interop scenarios.
+    /// - SetLastError support in P/Invokes is disabled.
+    /// - varargs support is disabled.
+    /// - LCIDConversionAttribute support is disabled.
+    /// </remarks>
+    [global::System.AttributeUsage(global::System.AttributeTargets.Assembly, Inherited = false, AllowMultiple = false)]
+    internal sealed class DisableRuntimeMarshallingAttribute : global::System.Attribute
+    {
+    }
+}

tests/PolySharp.Tests/RuntimeSupport.cs

@@ -1,11 +1,14 @@
 using System;
 using System.Diagnostics;
 using System.Diagnostics.CodeAnalysis;
+using System.Runtime.CompilerServices;
 using System.Runtime.InteropServices;
 using System.Runtime.Versioning;
 
 [assembly: TargetPlatform("windows6.1")]
 
+[assembly: DisableRuntimeMarshalling]
+
 namespace PolySharp.Tests;
 
 internal class RandomApis