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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);
// Aggressively 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);
}
}
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