Trigger exception debug event for promises at the throw site.

test/mjsunit/es6/debug-promises-throw-in-constructor.js

 // 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:
-//  - only the PendingExceptionInPromise debug event is triggered.
+// an exception is thrown in the the Promise constructor.
+// We expect an Exception debug event with a promise to be triggered.
 
 Debug = debug.Debug;
 
-var log = [];
 var step = 0;
-
-var p = new Promise(function(resolve, reject) {
-  log.push("resolve");
-  resolve();
-});
-
-var q = p.chain(
-  function() {
-    log.push("throw");
-    throw new Error("uncaught");
-  });
+var exception = null;
 
 function listener(event, exec_state, event_data, data) {
   try {
     // Ignore exceptions during startup in stress runs.
     if (step >= 1) return;
-    assertEquals(["resolve", "end main", "throw"], log);
     if (event == Debug.DebugEvent.Exception) {
-      assertUnreachable();
-    } else if (event == Debug.DebugEvent.PendingExceptionInPromise) {
       assertEquals(0, step);
       assertEquals("uncaught", event_data.exception().message);
       assertTrue(event_data.promise() instanceof Promise);
       assertTrue(event_data.uncaught());
+      // Assert that the debug event is triggered at the throw site.
+      assertTrue(exec_state.frame(0).sourceLineText().indexOf("// event") > 0);
       step++;
     }
   } 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);
+    exception = e;
   }
 }
 
 Debug.setBreakOnUncaughtException();
 Debug.setListener(listener);
 
-log.push("end main");
+var p = new Promise(function(resolve, reject) {
+  throw new Error("uncaught");  // event
+});
+
+assertEquals(1, step);
+assertNull(exception);