Trigger debug event on not yet caught exception in promises.

test/mjsunit/es6/debug-promises-caught-uncaught.js

Index: test/mjsunit/es6/debug-promises-caught-uncaught.js
diff --git a/test/mjsunit/es6/debug-promises-caught-uncaught.js b/test/mjsunit/es6/debug-promises-caught-uncaught.js
new file mode 100644
index 0000000000000000000000000000000000000000..6bc11ef772927b64f4f0ee6921e0b60e1d7234f6
--- /dev/null
+++ b/test/mjsunit/es6/debug-promises-caught-uncaught.js
@@ -0,0 +1,45 @@
+// Copyright 2014 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Flags: --harmony-promises --expose-debug-as debug
+
+// Test debug events when we only listen to uncaught exceptions and
+// there is a catch handler for the exception thrown in a Promise.
+// Expectation:
+//  - no debug event is triggered.
+
+Debug = debug.Debug;
+
+var p = new Promise(function(resolve, reject) {
+  resolve();
+});
+
+var q = p.chain(
+  function() {
+    throw new Error("caught");
+  });
+
+q.catch(
+  function(e) {
+    assertEquals("caught", e.message);
+  });
+
+function listener(event, exec_state, event_data, data) {
+  try {
+    if (event == Debug.DebugEvent.Exception) {
+      assertUnreachable();
+    } else if (event == Debug.DebugEvent.PendingExceptionInPromise) {

[rossberg, 2014/04/24 14:33:47]

Use a single if with ||

[Yang, 2014/04/24 14:44:53]

Done.

+      assertUnreachable();
+    }
+  } catch (e) {
+    // Signal a failure with exit code 1.  This is necessary since the
+    // debugger swallows exceptions and we expect the chained function
+    // and this listener to be executed after the main script is finished.
+    print("Unexpected exception: " + e + "\n" + e.stack);
+    quit(1);
+  }
+}
+
+Debug.setBreakOnUncaughtException();
+Debug.setListener(listener);