- Implement VM parts of https://codereview.chromium.org/1240743003/

tests/isolate/error_exit_at_spawn_test.dart

+// Copyright (c) 2015, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+library error_exit_at_spawn;
+
+import "dart:isolate";
+import "dart:async";
+import "package:async_helper/async_helper.dart";
+import "package:expect/expect.dart";
+
+isomain(replyPort) {
+  RawReceivePort port = new RawReceivePort();
+  port.handler = (v) {
+    switch (v) {
+      case 0:
+        replyPort.send(42);
+        break;
+      case 1:
+        throw new ArgumentError("whoops");
+      case 2:
+        throw new RangeError.value(37);
+      case 3:
+        port.close();
+    }
+  };
+  replyPort.send(port.sendPort);
+}
+
+main(){
+  asyncStart();
+  // Setup the port for communication with the newly spawned isolate.
+  RawReceivePort reply = new RawReceivePort(null);
+  SendPort sendPort;
+  int state = 0;
+  reply.handler = (port) {
+    sendPort = port;
+    port.send(state);
+    reply.handler = (v) {
+      Expect.equals(0, state);
+      Expect.equals(42, v);
+      state++;
+      sendPort.send(state);
+    };
+  };
+
+  // Capture errors from other isolate as raw messages.
+  RawReceivePort errorPort = new RawReceivePort();
+  errorPort.handler = (message) {
+    String error = message[0];
+    String stack = message[1];
+    switch (state) {
+      case 1:
+        Expect.equals(new ArgumentError("whoops").toString(), "$error");
+        state++;
+        sendPort.send(state);
+        break;
+      case 2:
+        Expect.equals(new RangeError.value(37).toString(), "$error");
+        state++;
+        sendPort.send(state);
+        reply.close();
+        errorPort.close();
+        break;
+      default:
+        throw "Bad state for error: $state: $error";
+    }
+  };
+  
+  // Get exit notifications from other isolate as raw messages.
+  RawReceivePort exitPort = new RawReceivePort();
+  exitPort.handler = (message) {
+    // onExit ports registered at spawn cannot have a particular message
+    // associated.
+    Expect.equals(null, message);
+    // Only exit after sending the termination message.
+    Expect.equals(3, state);
+    exitPort.close();
+    asyncEnd();
+  };
+  
+  Isolate.spawn(isomain,
+                reply.sendPort,
+                // Setup handlers as part of spawn.
+                errorsAreFatal: false,
+                onError: errorPort.sendPort,
+                onExit: exitPort.sendPort);
+}