Allow uncaught exception messaging in Object.observe callbacks.

src/runtime/runtime-observe.cc

 // 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.
 
 #include "src/v8.h"
 
 #include "src/arguments.h"
 #include "src/runtime/runtime-utils.h"
 
 namespace v8 {
@@ skipping 34 matching lines @@
 
 
 RUNTIME_FUNCTION(Runtime_RunMicrotasks) {
   HandleScope scope(isolate);
   DCHECK(args.length() == 0);
   isolate->RunMicrotasks();
   return isolate->heap()->undefined_value();
 }
 
 
+RUNTIME_FUNCTION(Runtime_DeliverObservationChangeRecords) {
+  HandleScope scope(isolate);
+  DCHECK(args.length() == 2);
+  CONVERT_ARG_HANDLE_CHECKED(JSFunction, callback, 0);
+  CONVERT_ARG_HANDLE_CHECKED(Object, argument, 1);
+  v8::TryCatch catcher;
+  // We should send a message on uncaught exception thrown during
+  // Object.observe delivery while not interrupting further delivery, thus
+  // we make a call inside a verbose TryCatch.
+  catcher.SetVerbose(true);
+  Handle<Object> argv[] = {argument};
+  USE(Execution::Call(isolate, callback, isolate->factory()->undefined_value(),
+                      arraysize(argv), argv));
+  if (isolate->has_pending_exception()) {
+    isolate->ReportPendingMessages();
+    isolate->clear_pending_exception();
+    isolate->set_external_caught_exception(false);
+  }
+  return isolate->heap()->undefined_value();
+}
+
+
 RUNTIME_FUNCTION(Runtime_GetObservationState) {
   SealHandleScope shs(isolate);
   DCHECK(args.length() == 0);
   return isolate->heap()->observation_state();
 }
 
 
 static bool ContextsHaveSameOrigin(Handle<Context> context1,
                                    Handle<Context> context2) {
   return context1->security_token() == context2->security_token();
@@ skipping 51 matching lines @@
 RUNTIME_FUNCTION(Runtime_GetObjectContextNotifierPerformChange) {
   HandleScope scope(isolate);
   DCHECK(args.length() == 1);
   CONVERT_ARG_HANDLE_CHECKED(JSObject, object_info, 0);
 
   Handle<Context> context(object_info->GetCreationContext(), isolate);
   return context->native_object_notifier_perform_change();
 }
 }
 }  // namespace v8::internal