Add exception interop test for validating native exception interop on Windows + CoreCLR.

src/tests/baseservices/exceptions/exceptioninterop/CMakeLists.txt

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+
+include_directories(${INC_PLATFORM_DIR})
+add_library(ExceptionInteropNative SHARED ExceptionInteropNative.cpp)
+target_link_libraries(ExceptionInteropNative PRIVATE platformdefines)

src/tests/baseservices/exceptions/exceptioninterop/ExceptionInterop.cs

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+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
+using System;
+using System.Runtime.CompilerServices;
+using System.Runtime.InteropServices;
+using Xunit;
+using static ExceptionInteropNative;
+
+internal unsafe static class ExceptionInteropNative
+{
+    [DllImport(nameof(ExceptionInteropNative))]
+    public static extern void ThrowException();
+
+    [DllImport(nameof(ExceptionInteropNative))]
+    public static extern void NativeFunction();
+
+    [DllImport(nameof(ExceptionInteropNative))]
+    public static extern void CallCallback(delegate* unmanaged<void> cb);
+}
+
+public unsafe static class ExceptionInterop
+{
+    [Fact]
+    [PlatformSpecific(TestPlatforms.Windows)]
+    [SkipOnMono("Exception interop not supported on Mono.")]
+    public static void ThrowNativeExceptionAndCatchInFrame()
+    {
+        bool caughtException = false;
+        try
+        {
+            ThrowException();
+        }
+        catch
+        {
+            caughtException = true;
+            // Try calling another P/Invoke in the catch block to make sure we have everything set up
+            // to recover from the exceptional control flow.
+            NativeFunction();
+        }
+        Assert.True(caughtException);
+    }
+
+    [Fact]
+    [PlatformSpecific(TestPlatforms.Windows)]
+    [SkipOnMono("Exception interop not supported on Mono.")]
+    public static void ThrowManagedExceptionThroughNativeAndCatchInFrame()
+    {
+        bool caughtException = false;
+        try
+        {
+            CallCallback(&ThrowManagedException);
+        }
+        catch
+        {
+            caughtException = true;
+            // Try calling another P/Invoke in the catch block to make sure we have everything set up
+            // to recover from the exceptional control flow.
+            NativeFunction();
+        }
+        Assert.True(caughtException);
+
+        [UnmanagedCallersOnly]
+        static void ThrowManagedException()
+        {
+            throw new Exception();
+        }
+    }
+
+    [Fact]
+    [PlatformSpecific(TestPlatforms.Windows)]
+    [SkipOnMono("Exception interop not supported on Mono.")]
+    public static void ThrowNativeExceptionAndCatchInFrameWithFilter()
+    {
+        bool caughtException = false;
+        try
+        {
+            ThrowException();
+        }
+        catch (Exception) when (Filter())
+        {
+            caughtException = true;
+            // Try calling another P/Invoke in the catch block to make sure we have everything set up
+            // to recover from the exceptional control flow.
+            NativeFunction();
+        }
+        Assert.True(caughtException);
+
+        // Aggresively inline to make sure the call to NativeFunction is in the filter clause
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
+        bool Filter()
+        {
+            NativeFunction();
+            return true;
+        }
+    }
+
+    [Fact]
+    [PlatformSpecific(TestPlatforms.Windows)]
+    [SkipOnMono("Exception interop not supported on Mono.")]
+    public static void ThrowNativeExceptionAndCatchInFrameWithFinally()
+    {
+        bool caughtException = false;
+        try
+        {
+            try
+            {
+                ThrowException();
+            }
+            finally
+            {
+                // Try calling another P/Invoke in the finally block before the catch
+                // to make sure we have everything set up
+                // to recover from the exceptional control flow.
+                NativeFunction();
+            }
+        }
+        catch
+        {
+            caughtException = true;
+        }
+
+        Assert.True(caughtException);
+    }
+}

src/tests/baseservices/exceptions/exceptioninterop/ExceptionInterop.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+    <PropertyGroup>
+      <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
+    </PropertyGroup>
+    <ItemGroup>
+      <CMakeProjectReference Include="CMakeLists.txt" />
+      <Compile Include="ExceptionInterop.cs" />
+    </ItemGroup>
+  </Project>
+

src/tests/baseservices/exceptions/exceptioninterop/ExceptionInteropNative.cpp

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+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
+#include <exception>
+#include <platformdefines.h>
+
+extern "C" DLL_EXPORT void STDMETHODCALLTYPE ThrowException()
+{
+    throw std::exception{};
+}
+
+extern "C" DLL_EXPORT void STDMETHODCALLTYPE NativeFunction()
+{
+}
+
+extern "C" DLL_EXPORT void STDMETHODCALLTYPE CallCallback(void (*cb)())
+{
+    cb();
+}

src/tests/baseservices/exceptions/exceptioninterop/ExceptionInterop_ro.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+    <PropertyGroup>
+      <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
+    </PropertyGroup>
+    <PropertyGroup>
+      <DebugType>None</DebugType>
+      <Optimize>True</Optimize>
+    </PropertyGroup>
+    <ItemGroup>
+      <CMakeProjectReference Include="CMakeLists.txt" />
+      <Compile Include="ExceptionInterop.cs" />
+    </ItemGroup>
+  </Project>
+