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diff --git a/webkit/port/bindings/v8/V8MessagePortCustom.cpp b/webkit/port/bindings/v8/V8MessagePortCustom.cpp
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+// Copyright (c) 2008, Google Inc.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+// * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+// * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+// * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#include "config.h"
+
+#include "v8_binding.h"
+#include "v8_custom.h"
+#include "v8_events.h"
+#include "v8_proxy.h"
+
+#include "V8Document.h"
+#include "V8HTMLDocument.h"
+
+#include "ExceptionCode.h"
+#include "MessagePort.h"
+
+namespace WebCore {
+
+// TODO(mbelshe) - merge these with XHR's CreateHiddenXHRDependency
+
+// Use an array to hold dependents. It works like a ref-counted scheme.
+// A value can be added more than once to the xhr object.
+static void CreateHiddenDependency(v8::Local<v8::Object> object,
+ v8::Local<v8::Value> value) {
+ ASSERT(V8Proxy::GetDOMWrapperType(object) ==
+ V8ClassIndex::MESSAGEPORT);
+ v8::Local<v8::Value> cache =
+ object->GetInternalField(V8Custom::kMessagePortRequestCacheIndex);
+ if (cache->IsNull() || cache->IsUndefined()) {
+ cache = v8::Array::New();
+ object->SetInternalField(V8Custom::kXMLHttpRequestCacheIndex, cache);
+ }
+
+ v8::Local<v8::Array> cache_array = v8::Local<v8::Array>::Cast(cache);
+ cache_array->Set(v8::Integer::New(cache_array->Length()), value);
+}
+
+static void RemoveHiddenDependency(v8::Local<v8::Object> object,
+ v8::Local<v8::Value> value) {
+ ASSERT(V8Proxy::GetDOMWrapperType(object) == V8ClassIndex::MESSAGEPORT);
+ v8::Local<v8::Value> cache =
+ object->GetInternalField(V8Custom::kMessagePortRequestCacheIndex);
+ ASSERT(cache->IsArray());
+ v8::Local<v8::Array> cache_array = v8::Local<v8::Array>::Cast(cache);
+ for (int i = cache_array->Length() - 1; i >= 0; i--) {
+ v8::Local<v8::Value> cached = cache_array->Get(v8::Integer::New(i));
+ if (cached->StrictEquals(value)) {
+ cache_array->Delete(i);
+ return;
+ }
+ }
+
+ // We should only get here if we try to remove an event listener that was
+ // never added.
+}
+
+ACCESSOR_GETTER(MessagePortOnmessage) {
+ INC_STATS(L"DOM.MessagePort.onmessage._get");
+ MessagePort* imp = V8Proxy::ToNativeObject<MessagePort>(
+ V8ClassIndex::MESSAGEPORT, info.Holder());
+ if (imp->onmessage()) {
+ V8ObjectEventListener* listener =
+ static_cast<V8ObjectEventListener*>(imp->onmessage());
+ v8::Local<v8::Object> v8_listener = listener->GetListenerObject();
+ return v8_listener;
+ }
+ return v8::Undefined();
+}
+
+ACCESSOR_SETTER(MessagePortOnmessage) {
+ INC_STATS(L"DOM.MessagePort.onmessage._set");
+ MessagePort* imp = V8Proxy::ToNativeObject<MessagePort>(
+ V8ClassIndex::MESSAGEPORT, info.Holder());
+ if (value->IsNull()) {
+ if (imp->onmessage()) {
+ V8ObjectEventListener* listener =
+ static_cast<V8ObjectEventListener*>(imp->onmessage());
+ v8::Local<v8::Object> v8_listener = listener->GetListenerObject();
+ RemoveHiddenDependency(info.Holder(), v8_listener);
+ }
+
+ // Clear the listener
+ imp->setOnmessage(0);
+
+ } else {
+ V8Proxy* proxy = V8Proxy::retrieve(imp->document()->frame());
+ if (!proxy)
+ return;
+
+ RefPtr<EventListener> listener =
+ proxy->FindOrCreateObjectEventListener(value, false);
+ if (listener) {
+ imp->setOnmessage(listener);
+ CreateHiddenDependency(info.Holder(), value);
+ }
+ }
+}
+
+ACCESSOR_GETTER(MessagePortOnclose) {
+ INC_STATS(L"DOM.MessagePort.onclose._get");
+ MessagePort* imp = V8Proxy::ToNativeObject<MessagePort>(
+ V8ClassIndex::MESSAGEPORT, info.Holder());
+ if (imp->onclose()) {
+ V8ObjectEventListener* listener =
+ static_cast<V8ObjectEventListener*>(imp->onclose());
+ v8::Local<v8::Object> v8_listener = listener->GetListenerObject();
+ return v8_listener;
+ }
+ return v8::Undefined();
+}
+
+ACCESSOR_SETTER(MessagePortOnclose) {
+ INC_STATS(L"DOM.MessagePort.onclose._set");
+ MessagePort* imp = V8Proxy::ToNativeObject<MessagePort>(
+ V8ClassIndex::MESSAGEPORT, info.Holder());
+ if (value->IsNull()) {
+ if (imp->onclose()) {
+ V8ObjectEventListener* listener =
+ static_cast<V8ObjectEventListener*>(imp->onclose());
+ v8::Local<v8::Object> v8_listener = listener->GetListenerObject();
+ RemoveHiddenDependency(info.Holder(), v8_listener);
+ }
+
+ // Clear the listener
+ imp->setOnclose(0);
+ } else {
+ V8Proxy* proxy = V8Proxy::retrieve(imp->document()->frame());
+ if (!proxy)
+ return;
+
+ RefPtr<EventListener> listener =
+ proxy->FindOrCreateObjectEventListener(value, false);
+ if (listener) {
+ imp->setOnclose(listener);
+ CreateHiddenDependency(info.Holder(), value);
+ }
+ }
+}
+
+CALLBACK_FUNC_DECL(MessagePortStartConversation) {
+ INC_STATS(L"DOM.MessagePort.StartConversation()");
+ if (args.Length() < 1) {
+ V8Proxy::ThrowError(V8Proxy::SYNTAX_ERROR, "Not enough arguments");
+ return v8::Undefined();
+ }
+
+ MessagePort* imp = V8Proxy::ToNativeObject<MessagePort>(
+ V8ClassIndex::MESSAGEPORT, args.Holder());
+
+ V8Proxy* proxy = V8Proxy::retrieve(imp->document()->frame());
+ if (!proxy)
+ return v8::Undefined();
+
+ RefPtr<MessagePort> port = imp->startConversation(imp->document(),
+ ToWebCoreString(args[0]));
+ v8::Handle<v8::Value> wrapper =
+ V8Proxy::ToV8Object(V8ClassIndex::MESSAGEPORT, port.get());
+ return wrapper;
+}
+
+CALLBACK_FUNC_DECL(MessagePortAddEventListener) {
+ INC_STATS(L"DOM.MessagePort.AddEventListener()");
+ MessagePort* imp = V8Proxy::ToNativeObject<MessagePort>(
+ V8ClassIndex::MESSAGEPORT, args.Holder());
+
+ V8Proxy* proxy = V8Proxy::retrieve(imp->document()->frame());
+ if (!proxy)
+ return v8::Undefined();
+
+ RefPtr<EventListener> listener =
+ proxy->FindOrCreateObjectEventListener(args[1], false);
+ if (listener) {
+ String type = ToWebCoreString(args[0]);
+ bool useCapture = args[2]->BooleanValue();
+ imp->addEventListener(type, listener, useCapture);
+
+ CreateHiddenDependency(args.Holder(), args[1]);
+ }
+ return v8::Undefined();
+}
+
+CALLBACK_FUNC_DECL(MessagePortRemoveEventListener) {
+ INC_STATS(L"DOM.MessagePort.RemoveEventListener()");
+ MessagePort* imp = V8Proxy::ToNativeObject<MessagePort>(
+ V8ClassIndex::MESSAGEPORT, args.Holder());
+
+ V8Proxy* proxy = V8Proxy::retrieve(imp->document()->frame());
+ if (!proxy)
+ return v8::Undefined(); // probably leaked
+
+ RefPtr<EventListener> listener =
+ proxy->FindObjectEventListener(args[1], false);
+
+ if (listener) {
+ String type = ToWebCoreString(args[0]);
+ bool useCapture = args[2]->BooleanValue();
+ imp->removeEventListener(type, listener.get(), useCapture);
+
+ RemoveHiddenDependency(args.Holder(), args[1]);
+ }
+
+ return v8::Undefined();
+}
+
+
+} // namespace WebCore
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