Bug 471285 - 'Workers: Spec for runtime error behavior has changed'. r+sr=jst, a=blocking1.9+

dom/public/idl/threads/nsIDOMWorkers.idl

@@ -67,6 +67,22 @@ interface nsIWorkerMessageEvent : nsIDOMEvent
                         in nsISupports aSourceArg);
 };
 
+[scriptable, uuid(73d82c1d-05de-49c9-a23b-7121ff09a67a)]
+interface nsIWorkerErrorEvent : nsIDOMEvent
+{
+  readonly attribute DOMString message;
+  readonly attribute DOMString filename;
+
+  readonly attribute unsigned long lineno;
+
+  void initErrorEvent(in DOMString aTypeArg,
+                      in boolean aCanBubbleArg,
+                      in boolean aCancelableArg,
+                      in DOMString aMessageArg,
+                      in DOMString aFilenameArg,
+                      in unsigned long aLinenoArg);
+};
+
 [scriptable, uuid(74fb665a-e477-4ce2-b3c6-c58b1b28b6c3)]
 interface nsIWorkerNavigator : nsISupports
 {
@@ -76,11 +92,13 @@ interface nsIWorkerNavigator : nsISupports
   readonly attribute DOMString userAgent;
 };
 
-[scriptable, uuid(a41ac154-ba18-4926-8954-cd6973ea490e)]
+[scriptable, uuid(d7d7cf59-6c8a-4598-8753-630953ae7409)]
 interface nsIWorkerGlobalScope : nsISupports
 {
   readonly attribute nsIWorkerGlobalScope self;
   readonly attribute nsIWorkerNavigator navigator;
+
+  attribute nsIDOMEventListener onerror;
 };
 
 [scriptable, uuid(d30a2f61-86e2-434e-837f-4f1985efa865)]

dom/src/threads/nsDOMThreadService.cpp

@@ -160,7 +160,8 @@ class nsReportErrorRunnable : public nsIRunnable
 public:
   NS_DECL_ISUPPORTS
 
-  nsReportErrorRunnable(nsDOMWorker* aWorker, nsIScriptError* aScriptError)
+  nsReportErrorRunnable(nsDOMWorker* aWorker,
+                        nsIScriptError* aScriptError)
   : mWorker(aWorker), mWorkerWN(aWorker->GetWrappedNative()),
     mScriptError(aScriptError) {
       NS_ASSERTION(aScriptError, "Null pointer!");
@@ -191,34 +192,37 @@ public:
 
     NS_NAMED_LITERAL_STRING(errorStr, "error");
 
-    PRBool hasListener = PR_FALSE, stopPropagation = PR_FALSE;
+    nsresult rv;
-    nsresult rv = NS_OK;
 
     if (mWorker->mOuterHandler->HasListeners(errorStr)) {
-      hasListener = PR_TRUE;
+      // Construct the error event.
-      nsRefPtr<nsDOMWorkerMessageEvent> event(new nsDOMWorkerMessageEvent());
+      nsString message;
-      if (event) {
+      rv = mScriptError->GetErrorMessage(message);
-        nsCString errorMessage;
+      NS_ENSURE_SUCCESS(rv, rv);
-        rv = mScriptError->ToString(errorMessage);
-        if (NS_SUCCEEDED(rv)) {
-          rv = event->InitMessageEvent(errorStr, PR_FALSE, PR_FALSE,
-                                       NS_ConvertUTF8toUTF16(errorMessage),
-                                       EmptyString(), nsnull);
-          if (NS_SUCCEEDED(rv)) {
-            event->SetTarget(mWorker);
-            rv = mWorker->DispatchEvent(static_cast<nsDOMWorkerEvent*>(event),
-                                        &stopPropagation);
-            if (NS_FAILED(rv)) {
-              stopPropagation = PR_FALSE;
-            }
-          }
-        }
-      }
-    }
-    NS_ENSURE_SUCCESS(rv, rv);
 
-    if (stopPropagation) {
+      nsString filename;
-      return NS_OK;
+      rv = mScriptError->GetSourceName(filename);
+      NS_ENSURE_SUCCESS(rv, rv);
+
+      PRUint32 lineno;
+      rv = mScriptError->GetLineNumber(&lineno);
+      NS_ENSURE_SUCCESS(rv, rv);
+
+      nsRefPtr<nsDOMWorkerErrorEvent> event(new nsDOMWorkerErrorEvent());
+      NS_ENSURE_TRUE(event, NS_ERROR_OUT_OF_MEMORY);
+
+      rv = event->InitErrorEvent(errorStr, PR_FALSE, PR_TRUE, message,
+                                 filename, lineno);
+      NS_ENSURE_SUCCESS(rv, rv);
+
+      event->SetTarget(mWorker);
+
+      PRBool stopPropagation = PR_FALSE;
+      rv = mWorker->DispatchEvent(static_cast<nsDOMWorkerEvent*>(event),
+                                  &stopPropagation);
+      if (NS_SUCCEEDED(rv) && stopPropagation) {
+        return NS_OK;
+      }
     }
 
     nsRefPtr<nsDOMWorker> parent = mWorker->GetParent();
@@ -504,6 +508,31 @@ DOMWorkerErrorReporter(JSContext* aCx,
                          column, aReport->flags, "DOM Worker javascript");
   NS_ENSURE_SUCCESS(rv,);
 
+  // Try the onerror handler for the worker's scope.
+  nsCOMPtr<nsIDOMEventListener> handler =
+    worker->mInnerHandler->GetOnXListener(NS_LITERAL_STRING("error"));
+
+  if (handler) {
+    nsRefPtr<nsDOMWorkerErrorEvent> event(new nsDOMWorkerErrorEvent());
+    NS_ENSURE_TRUE(event,);
+
+    rv = event->InitErrorEvent(NS_LITERAL_STRING("error"), PR_FALSE, PR_TRUE,
+                               nsDependentString(message), filename,
+                               aReport->lineno);
+    NS_ENSURE_SUCCESS(rv,);
+
+    NS_ASSERTION(worker->GetInnerScope(), "Null scope!");
+    event->SetTarget(worker->GetInnerScope());
+
+    rv = handler->HandleEvent(static_cast<nsDOMWorkerEvent*>(event));
+    NS_ENSURE_SUCCESS(rv,);
+
+    if (event->PreventDefaultCalled()) {
+      return;
+    }
+  }
+
+  // Still unhandled, fire at the onerror handler on the worker.
   nsCOMPtr<nsIRunnable> runnable =
     new nsReportErrorRunnable(worker, scriptError);
   NS_ENSURE_TRUE(runnable,);

dom/src/threads/nsDOMWorker.cpp

@@ -522,29 +522,12 @@ GetStringForArgument(nsAString& aString,
   return NS_OK;
 }
 
-class nsDOMWorkerScope : public nsIWorkerScope,
+nsDOMWorkerScope::nsDOMWorkerScope(nsDOMWorker* aWorker)
-                         public nsIDOMEventTarget,
+: mWorker(aWorker),
-                         public nsIXPCScriptable,
+  mHasOnerror(PR_FALSE)
-                         public nsIClassInfo
 {
-public:
+  NS_ASSERTION(aWorker, "Null pointer!");
-  NS_DECL_ISUPPORTS
+}
-  NS_DECL_NSIWORKERGLOBALSCOPE
-  NS_DECL_NSIWORKERSCOPE
-  NS_DECL_NSIDOMEVENTTARGET
-  NS_DECL_NSIXPCSCRIPTABLE
-  NS_DECL_NSICLASSINFO
-
-  nsDOMWorkerScope(nsDOMWorker* aWorker)
-  : mWorker(aWorker) {
-    NS_ASSERTION(aWorker, "Null pointer!");
-  }
-
-private:
-  nsDOMWorker* mWorker;
-
-  nsRefPtr<nsDOMWorkerNavigator> mNavigator;
-};
 
 NS_IMPL_THREADSAFE_ISUPPORTS5(nsDOMWorkerScope, nsIWorkerScope,
                                                 nsIWorkerGlobalScope,
@@ -617,6 +600,56 @@ nsDOMWorkerScope::GetNavigator(nsIWorkerNavigator** _retval)
   return NS_OK;
 }
 
+NS_IMETHODIMP
+nsDOMWorkerScope::GetOnerror(nsIDOMEventListener** aOnerror)
+{
+  NS_ASSERTION(!NS_IsMainThread(), "Wrong thread!");
+  NS_ENSURE_ARG_POINTER(aOnerror);
+
+  if (mWorker->IsCanceled()) {
+    return NS_ERROR_ABORT;
+  }
+
+  if (!mHasOnerror) {
+    // Spec says we have to return 'undefined' until something is set here.
+    nsIXPConnect* xpc = nsContentUtils::XPConnect();
+    NS_ENSURE_TRUE(xpc, NS_ERROR_UNEXPECTED);
+
+    nsAXPCNativeCallContext* cc;
+    nsresult rv = xpc->GetCurrentNativeCallContext(&cc);
+    NS_ENSURE_SUCCESS(rv, rv);
+    NS_ENSURE_TRUE(cc, NS_ERROR_UNEXPECTED);
+
+    jsval* retval;
+    rv = cc->GetRetValPtr(&retval);
+    NS_ENSURE_SUCCESS(rv, rv);
+
+    *retval = JSVAL_VOID;
+    return cc->SetReturnValueWasSet(PR_TRUE);
+  }
+
+  nsCOMPtr<nsIDOMEventListener> listener =
+    mWorker->mInnerHandler->GetOnXListener(NS_LITERAL_STRING("error"));
+  listener.forget(aOnerror);
+
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsDOMWorkerScope::SetOnerror(nsIDOMEventListener* aOnerror)
+{
+  NS_ASSERTION(!NS_IsMainThread(), "Wrong thread!");
+
+  if (mWorker->IsCanceled()) {
+    return NS_ERROR_ABORT;
+  }
+
+  mHasOnerror = PR_TRUE;
+
+  return mWorker->mInnerHandler->SetOnXListener(NS_LITERAL_STRING("error"),
+                                                aOnerror);
+}
+
 NS_IMETHODIMP
 nsDOMWorkerScope::PostMessage(/* JSObject aMessage */)
 {

dom/src/threads/nsDOMWorker.h

@@ -54,9 +54,11 @@
 
 #include "nsDOMWorkerMessageHandler.h"
 
+class nsDOMWorker;
+class nsDOMWorkerFeature;
 class nsDOMWorkerMessageHandler;
+class nsDOMWorkerNavigator;
 class nsDOMWorkerPool;
-class nsDOMWorkerScope;
 class nsDOMWorkerTimeout;
 class nsICancelable;
 class nsIDOMEventListener;
@@ -64,7 +66,28 @@ class nsIEventTarget;
 class nsIScriptGlobalObject;
 class nsIXPConnectWrappedNative;
 
-class nsDOMWorkerFeature;
+class nsDOMWorkerScope : public nsIWorkerScope,
+                         public nsIDOMEventTarget,
+                         public nsIXPCScriptable,
+                         public nsIClassInfo
+{
+public:
+  NS_DECL_ISUPPORTS
+  NS_DECL_NSIWORKERGLOBALSCOPE
+  NS_DECL_NSIWORKERSCOPE
+  NS_DECL_NSIDOMEVENTTARGET
+  NS_DECL_NSIXPCSCRIPTABLE
+  NS_DECL_NSICLASSINFO
+
+  nsDOMWorkerScope(nsDOMWorker* aWorker);
+
+private:
+  nsDOMWorker* mWorker;
+
+  nsRefPtr<nsDOMWorkerNavigator> mNavigator;
+
+  PRPackedBool mHasOnerror;
+};
 
 class nsDOMWorker : public nsIWorker,
                     public nsIJSNativeInitializer,

dom/src/threads/nsDOMWorkerEvents.cpp

@@ -56,6 +56,7 @@ nsDOMWorkerPrivateEvent::nsDOMWorkerPrivateEvent(nsIDOMEvent* aEvent)
 : mEvent(aEvent),
   mProgressEvent(do_QueryInterface(aEvent)),
   mMessageEvent(do_QueryInterface(aEvent)),
+  mErrorEvent(do_QueryInterface(aEvent)),
   mPreventDefaultCalled(PR_FALSE)
 {
   NS_ASSERTION(aEvent, "Null pointer!");
@@ -70,6 +71,7 @@ NS_INTERFACE_MAP_BEGIN(nsDOMWorkerPrivateEvent)
   NS_INTERFACE_MAP_ENTRY(nsIDOMWorkerPrivateEvent)
   NS_INTERFACE_MAP_ENTRY_CONDITIONAL(nsIDOMProgressEvent, mProgressEvent)
   NS_INTERFACE_MAP_ENTRY_CONDITIONAL(nsIWorkerMessageEvent, mMessageEvent)
+  NS_INTERFACE_MAP_ENTRY_CONDITIONAL(nsIWorkerErrorEvent, mErrorEvent)
   NS_INTERFACE_MAP_ENTRY(nsIClassInfo)
 NS_INTERFACE_MAP_END
 
@@ -91,7 +93,13 @@ nsDOMWorkerPrivateEvent::GetInterfaces(PRUint32* aCount, nsIID*** aArray)
 NS_IMETHODIMP
 nsDOMWorkerPrivateEvent::PreventDefault()
 {
-  mPreventDefaultCalled = PR_TRUE;
+  PRBool cancelable = PR_FALSE;
+  mEvent->GetCancelable(&cancelable);
+
+  if (cancelable) {
+    mPreventDefaultCalled = PR_TRUE;
+  }
+
   return mEvent->PreventDefault();
 }
 
@@ -136,6 +144,21 @@ nsDOMWorkerPrivateEvent::InitMessageEvent(const nsAString& aTypeArg,
                                          aSourceArg);
 }
 
+NS_IMETHODIMP
+nsDOMWorkerPrivateEvent::InitErrorEvent(const nsAString& aTypeArg,
+                                        PRBool aCanBubbleArg,
+                                        PRBool aCancelableArg,
+                                        const nsAString& aMessageArg,
+                                        const nsAString& aFilenameArg,
+                                        PRUint32 aLinenoArg)
+{
+  NS_ASSERTION(mErrorEvent, "Impossible!");
+
+  mPreventDefaultCalled = PR_FALSE;
+  return mErrorEvent->InitErrorEvent(aTypeArg, aCanBubbleArg, aCancelableArg,
+                                     aMessageArg, aFilenameArg, aLinenoArg);
+}
+
 PRBool
 nsDOMWorkerPrivateEvent::PreventDefaultCalled()
 {
@@ -539,3 +562,47 @@ nsDOMWorkerXHREvent::Run()
   NS_ENSURE_SUCCESS(rv, rv);
   return NS_OK;
 }
+
+NS_IMPL_ISUPPORTS_INHERITED1(nsDOMWorkerErrorEvent, nsDOMWorkerEvent,
+                                                    nsIWorkerErrorEvent)
+
+NS_IMPL_CI_INTERFACE_GETTER2(nsDOMWorkerErrorEvent, nsIDOMEvent,
+                                                    nsIWorkerErrorEvent)
+
+NS_IMPL_THREADSAFE_DOM_CI_GETINTERFACES(nsDOMWorkerErrorEvent)
+
+nsresult
+nsDOMWorkerErrorEvent::GetMessage(nsAString& aMessage)
+{
+  aMessage.Assign(mMessage);
+  return NS_OK;
+}
+
+nsresult
+nsDOMWorkerErrorEvent::GetFilename(nsAString& aFilename)
+{
+  aFilename.Assign(mFilename);
+  return NS_OK;
+}
+
+nsresult
+nsDOMWorkerErrorEvent::GetLineno(PRUint32* aLineno)
+{
+  NS_ENSURE_ARG_POINTER(aLineno);
+  *aLineno = mLineno;
+  return NS_OK;
+}
+
+nsresult
+nsDOMWorkerErrorEvent::InitErrorEvent(const nsAString& aTypeArg,
+                                      PRBool aCanBubbleArg,
+                                      PRBool aCancelableArg,
+                                      const nsAString& aMessageArg,
+                                      const nsAString& aFilenameArg,
+                                      PRUint32 aLinenoArg)
+{
+  mMessage.Assign(aMessageArg);
+  mFilename.Assign(aFilenameArg);
+  mLineno = aLinenoArg;
+  return InitEvent(aTypeArg, aCanBubbleArg, aCancelableArg);
+}

dom/src/threads/nsDOMWorkerEvents.h

@@ -108,9 +108,18 @@ public:
   NS_IMETHOD GetSource(nsISupports** aSource)                                 \
     { return mMessageEvent->GetSource(aSource); }
 
+#define NS_FORWARD_NSIWORKERERROREVENT_SPECIAL                                \
+  NS_IMETHOD GetMessage(nsAString& aMessage)                                  \
+    { return mErrorEvent->GetMessage(aMessage); }                             \
+  NS_IMETHOD GetFilename(nsAString& aFilename)                                \
+    { return mErrorEvent->GetFilename(aFilename); }                           \
+  NS_IMETHOD GetLineno(PRUint32* aLineno)                                     \
+    { return mErrorEvent->GetLineno(aLineno); }
+
 class nsDOMWorkerPrivateEvent : public nsIDOMWorkerPrivateEvent,
                                 public nsIDOMProgressEvent,
                                 public nsIWorkerMessageEvent,
+                                public nsIWorkerErrorEvent,
                                 public nsIClassInfo
 {
 public:
@@ -118,6 +127,7 @@ public:
   NS_FORWARD_NSIDOMEVENT_SPECIAL
   NS_FORWARD_NSIWORKERMESSAGEEVENT_SPECIAL
   NS_FORWARD_NSIDOMPROGRESSEVENT_SPECIAL
+  NS_FORWARD_NSIWORKERERROREVENT_SPECIAL
   NS_DECL_NSICLASSINFO
 
   nsDOMWorkerPrivateEvent(nsIDOMEvent* aEvent);
@@ -142,12 +152,20 @@ public:
                               const nsAString& aOriginArg,
                               nsISupports* aSourceArg);
 
+  NS_IMETHOD InitErrorEvent(const nsAString& aTypeArg,
+                            PRBool aCanBubbleArg,
+                            PRBool aCancelableArg,
+                            const nsAString& aMessageArg,
+                            const nsAString& aFilenameArg,
+                            PRUint32 aLinenoArg);
+
   virtual PRBool PreventDefaultCalled();
 
 private:
   nsCOMPtr<nsIDOMEvent> mEvent;
   nsCOMPtr<nsIDOMProgressEvent> mProgressEvent;
   nsCOMPtr<nsIWorkerMessageEvent> mMessageEvent;
+  nsCOMPtr<nsIWorkerErrorEvent> mErrorEvent;
   PRBool mPreventDefaultCalled;
 };
 
@@ -167,6 +185,10 @@ public:
     mTarget = aTarget;
   }
 
+  PRBool PreventDefaultCalled() {
+    return PRBool(mPreventDefaultCalled);
+  }
+
 protected:
   virtual ~nsDOMWorkerEvent() { }
 
@@ -300,4 +322,22 @@ protected:
   PRPackedBool mProgressEvent;
 };
 
+class nsDOMWorkerErrorEvent : public nsDOMWorkerEvent,
+                              public nsIWorkerErrorEvent
+{
+public:
+  NS_DECL_ISUPPORTS_INHERITED
+  NS_FORWARD_NSIDOMEVENT(nsDOMWorkerEvent::)
+  NS_DECL_NSIWORKERERROREVENT
+  NS_DECL_NSICLASSINFO_GETINTERFACES
+
+  nsDOMWorkerErrorEvent()
+  : mLineno(0) { }
+
+protected:
+  nsString mMessage;
+  nsString mFilename;
+  PRUint32 mLineno;
+};
+
 #endif /* __NSDOMWORKEREVENTS_H__ */

dom/src/threads/test/Makefile.in

@@ -70,6 +70,8 @@ _TEST_FILES = \
   relativeLoad_worker.js \
   relativeLoad_worker2.js \
   relativeLoad_import.js \
+  test_scopeOnerror.html \
+  scopeOnerror_worker.js \
   test_simpleThread.html \
   simpleThread_worker.js \
   test_terminate.html \

dom/src/threads/test/errorPropagation_worker1.js

@@ -10,11 +10,11 @@ worker.onerror = function(event) {
     case 2:
       // Stop and rethrow.
       event.preventDefault();
-      throw event.data;
+      throw event.message;
       break;
     case 3:
       event.preventDefault();
-      postMessage(event.data);
+      postMessage(event.message);
       worker.onerror = null;
       break;
     default:

dom/src/threads/test/importScripts_worker_imported1.js

@@ -3,5 +3,4 @@ var myConstructor = {}.constructor;
 
 // Try to call a function defined in the imported script.
 function importedScriptFunction() {
-  dump("running importedScriptFunction\n");
 }

dom/src/threads/test/importScripts_worker_imported2.js

@@ -3,5 +3,4 @@ var myConstructor2 = {}.constructor;
 
 // Try to call a function defined in the imported script.
 function importedScriptFunction2() {
-  dump("running importedScriptFunction2\n");
 }

dom/src/threads/test/relativeLoad_worker.js

@@ -4,7 +4,6 @@ onmessage = function(event) {
   var xhr = new XMLHttpRequest();
   xhr.open("GET", "testXHR.txt", false);
   xhr.send(null);
-  dump("XXXben: " + xhr.responseText + "\n");
   if (xhr.status != 200 ||
       xhr.responseText != "A noisy noise annoys an oyster.") {
     throw "Couldn't get xhr text from where we wanted it!";

dom/src/threads/test/scopeOnerror_worker.js

@@ -0,0 +1,26 @@
+if (onerror !== undefined || typeof(onerror) != "undefined") {
+  throw "Undefined onerror has bad type!";
+}
+
+onerror = function(event) {
+  if (!event.cancelable) {
+    throw "Error event is not cancelable!";
+  }
+
+  if (event.target != this) {
+    throw "Error event is targeted at the wrong object!";
+  }
+
+  if (event.message == "uncaught exception: This error should not make it back out") {
+    event.preventDefault();
+    postMessage("Done");
+  }
+}
+
+if (onerror === undefined || typeof(onerror) == "undefined") {
+  throw "onerror has a bad type!";
+}
+
+onmessage = function(event) {
+  throw event.data;
+}

dom/src/threads/test/test_errorPropagation.html

@@ -35,8 +35,7 @@ Tests of DOM Worker Threads
 
   worker.onmessage = function(event) {
     is(event.target, worker);
-    ok(event.data.indexOf(errors[errorIndex]) != -1,
+    isnot(-1, event.data.indexOf(errors[errorIndex]));
-       "Wrong message!");
     ok(errorIndex == errors.length - 1, "Wrong number of errors seen!");
     SimpleTest.finish();
   }
@@ -49,8 +48,7 @@ Tests of DOM Worker Threads
     netscape.security.PrivilegeManager.enablePrivilege('UniversalXPConnect');
 
     is(event.target, worker);
-    ok(event.data.indexOf(errors[errorIndex]) != -1,
+    isnot(-1, event.message.indexOf(errors[errorIndex]));
-       "Wrong message!");
 
     switch (errorIndex) {
       case 1:
@@ -79,7 +77,9 @@ Tests of DOM Worker Threads
         return;
       }
 
-      ok(message.message.indexOf(errors[errorIndex]) != -1, "Wrong message!");
+      is(message.message,
+         '[JavaScript Error: "uncaught exception: This exception should show ' +
+         'up in the JS console"]');
       worker.onerror = errorHandler;
       nextError();
     },

dom/src/threads/test/test_recursion.html

@@ -20,9 +20,7 @@ Tests of DOM Worker Threads
   var worker = new Worker("recursion_worker.js");
 
   worker.onerror = function(event) {
-    is(event.data,
+    is(event.message, "too much recursion");
-       '[JavaScript Error: "too much recursion" {file: "http://localhost:8888' +
-       '/tests/dom/src/threads/test/recursion_worker.js" line: 2}]');
     SimpleTest.finish();
   }
 

dom/src/threads/test/test_scopeOnerror.html

@@ -0,0 +1,44 @@
+<!DOCTYPE HTML>
+<html>
+<!--
+Tests of DOM Worker Threads
+-->
+<head>
+  <title>Test for DOM Worker Threads</title>
+  <script type="text/javascript" src="/MochiKit/MochiKit.js"></script>
+  <script type="text/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<pre id="test">
+<script class="testbody" type="text/javascript">
+
+  var errors = [
+    "This exception should make it to onerror",
+    "This error should not make it back out"
+  ];
+
+  var worker = new Worker("scopeOnError_worker.js");
+
+  worker.onmessage = function(event) {
+    ok(event.data == "Done");
+    SimpleTest.finish();
+  }
+
+  worker.onerror = function(event) {
+    is(event.target, worker);
+    is(event.message, "uncaught exception: " + errors[0]);
+    event.preventDefault();
+  };
+
+  for (var index in errors) {
+    worker.postMessage(errors[index]);
+  }
+
+  SimpleTest.waitForExplicitFinish();
+
+</script>
+</pre>
+</body>
+</html>
+

dom/src/threads/test/test_simpleThread.html

@@ -43,19 +43,15 @@ Tests of DOM Worker Threads (Bug 437152)
   var gotErrors = false;
   worker.onerror = function(event) {
     is(event.target, worker);
-    is(event.data,
+    is(event.message, "uncaught exception: Bad message: asdf");
-       '[JavaScript Error: "uncaught exception: Bad message: asdf"]');
 
     worker.onerror = function(otherEvent) {
       is(otherEvent.target, worker);
-      is(otherEvent.data,
+      is(otherEvent.message, "Components is not defined");
-         '[JavaScript Error: "Components is not defined" {file: ' +
-         '"http://localhost:8888/tests/dom/src/threads/test/' +
-         'simpleThread_worker.js" line: 6}]');
         gotErrors = true;
 
       worker.onerror = function(oneMoreEvent) {
-        ok(false, "Worker had an error:" + oneMoreEvent.data);
+        ok(false, "Worker had an error:" + oneMoreEvent.message);
         SimpleTest.finish();
       };
     };