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[NativeAOT] Add DefaultUncaughtExceptionHandler #9994

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Merged
merged 3 commits into from
Apr 9, 2025
Merged

[NativeAOT] Add DefaultUncaughtExceptionHandler #9994

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19cc3fa
[NativeAOT] Add DefaultUncaughtExceptionHandler
jonpryor Apr 1, 2025
7f4ea56
Merge remote-tracking branch 'origin/main' into dev/jonp/jonp-nativea…
jonpryor Apr 2, 2025
3210362
Remove log message
jonpryor Apr 9, 2025
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5 changes: 5 additions & 0 deletions samples/NativeAOT/MainActivity.cs
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Expand Up @@ -22,5 +22,10 @@ protected override void OnCreate(Bundle? savedInstanceState)
// An example of an Android API that uses a Java array
var list = new ColorStateList (new int[][] { [ 0, 1 ]}, [0, 1]);
Log.Debug ("NativeAOT", "MainActivity.OnCreate() ColorStateList: " + list);

var t = Intent?.Extras?.GetBoolean ("throw") ?? false;
if (t) {
throw new InvalidOperationException ("What happened?");
}
}
}
9 changes: 9 additions & 0 deletions src/Microsoft.Android.Runtime.NativeAOT/Android.Runtime.NativeAOT/JavaInteropRuntime.cs
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Expand Up @@ -33,6 +33,7 @@ static void JNI_OnUnload (IntPtr vm, IntPtr reserved)
[UnmanagedCallersOnly (EntryPoint="Java_net_dot_jni_nativeaot_JavaInteropRuntime_init")]
static void init (IntPtr jnienv, IntPtr klass)
{
JniTransition transition = default;
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Looks like this is a struct, and no need to check if it's "empty"? Seems like the methods are no-op:

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Yes, methods are a no-op if the struct "default constructor" is used. The non-default constructor can't be used until after a JniRuntime exists, which made structure "weird".

try {
var settings = new DiagnosticSettings ();
settings.AddDebugDotnetLog ();
Expand All @@ -50,9 +51,17 @@ static void init (IntPtr jnienv, IntPtr klass)

// Entry point into Mono.Android.dll
JNIEnvInit.InitializeJniRuntime (runtime);

transition = new JniTransition (jnienv);

var handler = Java.Lang.Thread.DefaultUncaughtExceptionHandler;
Java.Lang.Thread.DefaultUncaughtExceptionHandler = new UncaughtExceptionMarshaler (handler);
AndroidLog.Print (AndroidLogLevel.Info, "JavaInteropRuntime", $"init: Thread.DefaultUncaughtExceptionHandler={Java.Lang.Thread.DefaultUncaughtExceptionHandler}");
}
catch (Exception e) {
AndroidLog.Print (AndroidLogLevel.Error, "JavaInteropRuntime", $"JavaInteropRuntime.init: error: {e}");
transition.SetPendingException (e);
}
transition.Dispose ();
}
}
20 changes: 20 additions & 0 deletions src/Microsoft.Android.Runtime.NativeAOT/UncaughtExceptionMarshaler.cs
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@@ -0,0 +1,20 @@
using Java.Interop;

namespace Microsoft.Android.Runtime;

class UncaughtExceptionMarshaler (Java.Lang.Thread.IUncaughtExceptionHandler? OriginalHandler)
: Java.Lang.Object, Java.Lang.Thread.IUncaughtExceptionHandler
{
public void UncaughtException (Java.Lang.Thread thread, Java.Lang.Throwable exception)
{
var e = (JniEnvironment.Runtime.ValueManager.PeekValue (exception.PeerReference) as System.Exception)
?? exception;

AndroidLog.Print (AndroidLogLevel.Fatal, "DOTNET", $"FATAL UNHANDLED EXCEPTION: {e}");

// TODO: https://github.com/dotnet/runtime/issues/102730
// ExceptionHandling.RaiseUnhandledExceptionEvent(e);

OriginalHandler?.UncaughtException (thread, exception);
}
}
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