--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/WebCore/bindings/v8/V8DOMWrapper.cpp	Fri Sep 17 09:02:29 2010 +0300
@@ -0,0 +1,452 @@
+/*
+ * Copyright (C) 2009 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 "V8DOMWrapper.h"
+
+#include "CSSMutableStyleDeclaration.h"
+#include "DOMDataStore.h"
+#include "DocumentLoader.h"
+#include "FrameLoaderClient.h"
+#include "Notification.h"
+#include "ScriptController.h"
+#include "V8AbstractEventListener.h"
+#include "V8Binding.h"
+#include "V8Collection.h"
+#include "V8CustomEventListener.h"
+#include "V8DedicatedWorkerContext.h"
+#include "V8DOMApplicationCache.h"
+#include "V8DOMMap.h"
+#include "V8DOMWindow.h"
+#include "V8EventListenerList.h"
+#include "V8EventSource.h"
+#include "V8FileReader.h"
+#include "V8HTMLCollection.h"
+#include "V8HTMLDocument.h"
+#include "V8IDBRequest.h"
+#include "V8IsolatedContext.h"
+#include "V8Location.h"
+#include "V8MessageChannel.h"
+#include "V8NamedNodeMap.h"
+#include "V8Node.h"
+#include "V8NodeFilterCondition.h"
+#include "V8NodeList.h"
+#include "V8Notification.h"
+#include "V8Proxy.h"
+#include "V8SharedWorker.h"
+#include "V8SharedWorkerContext.h"
+#include "V8StyleSheet.h"
+#include "V8WebSocket.h"
+#include "V8Worker.h"
+#include "V8WorkerContext.h"
+#include "V8WorkerContextEventListener.h"
+#include "V8XMLHttpRequest.h"
+#include "ArrayBufferView.h"
+#include "WebGLContextAttributes.h"
+#include "WebGLUniformLocation.h"
+#include "WorkerContextExecutionProxy.h"
+#include "WrapperTypeInfo.h"
+
+#if ENABLE(SVG)
+#include "SVGElementInstance.h"
+#include "SVGPathSeg.h"
+#include "V8SVGElementInstance.h"
+#endif
+
+#include <algorithm>
+#include <utility>
+#include <v8-debug.h>
+#include <wtf/Assertions.h>
+#include <wtf/OwnArrayPtr.h>
+#include <wtf/StdLibExtras.h>
+#include <wtf/UnusedParam.h>
+
+namespace WebCore {
+
+typedef HashMap<Node*, v8::Object*> DOMNodeMap;
+typedef HashMap<void*, v8::Object*> DOMObjectMap;
+
+// The caller must have increased obj's ref count.
+void V8DOMWrapper::setJSWrapperForDOMObject(void* object, v8::Persistent<v8::Object> wrapper)
+{
+    ASSERT(V8DOMWrapper::maybeDOMWrapper(wrapper));
+    ASSERT(!domWrapperType(wrapper)->toActiveDOMObjectFunction);
+    getDOMObjectMap().set(object, wrapper);
+}
+
+// The caller must have increased obj's ref count.
+void V8DOMWrapper::setJSWrapperForActiveDOMObject(void* object, v8::Persistent<v8::Object> wrapper)
+{
+    ASSERT(V8DOMWrapper::maybeDOMWrapper(wrapper));
+    ASSERT(domWrapperType(wrapper)->toActiveDOMObjectFunction);
+    getActiveDOMObjectMap().set(object, wrapper);
+}
+
+// The caller must have increased node's ref count.
+void V8DOMWrapper::setJSWrapperForDOMNode(Node* node, v8::Persistent<v8::Object> wrapper)
+{
+    ASSERT(V8DOMWrapper::maybeDOMWrapper(wrapper));
+    getDOMNodeMap().set(node, wrapper);
+}
+
+v8::Local<v8::Function> V8DOMWrapper::getConstructor(WrapperTypeInfo* type, v8::Handle<v8::Value> objectPrototype)
+{
+    // A DOM constructor is a function instance created from a DOM constructor
+    // template. There is one instance per context. A DOM constructor is
+    // different from a normal function in two ways:
+    //   1) it cannot be called as constructor (aka, used to create a DOM object)
+    //   2) its __proto__ points to Object.prototype rather than
+    //      Function.prototype.
+    // The reason for 2) is that, in Safari, a DOM constructor is a normal JS
+    // object, but not a function. Hotmail relies on the fact that, in Safari,
+    // HTMLElement.__proto__ == Object.prototype.
+    v8::Handle<v8::FunctionTemplate> functionTemplate = type->getTemplate();
+    // Getting the function might fail if we're running out of
+    // stack or memory.
+    v8::TryCatch tryCatch;
+    v8::Local<v8::Function> value = functionTemplate->GetFunction();
+    if (value.IsEmpty())
+        return v8::Local<v8::Function>();
+    // Hotmail fix, see comments above.
+    if (!objectPrototype.IsEmpty())
+        value->SetPrototype(objectPrototype);
+    return value;
+}
+
+v8::Local<v8::Function> V8DOMWrapper::getConstructorForContext(WrapperTypeInfo* type, v8::Handle<v8::Context> context)
+{
+    // Enter the scope for this context to get the correct constructor.
+    v8::Context::Scope scope(context);
+
+    return getConstructor(type, V8DOMWindowShell::getHiddenObjectPrototype(context));
+}
+
+v8::Local<v8::Function> V8DOMWrapper::getConstructor(WrapperTypeInfo* type, DOMWindow* window)
+{
+    Frame* frame = window->frame();
+    if (!frame)
+        return v8::Local<v8::Function>();
+
+    v8::Handle<v8::Context> context = V8Proxy::context(frame);
+    if (context.IsEmpty())
+        return v8::Local<v8::Function>();
+
+    return getConstructorForContext(type, context);
+}
+
+#if ENABLE(WORKERS)
+v8::Local<v8::Function> V8DOMWrapper::getConstructor(WrapperTypeInfo* type, WorkerContext*)
+{
+    WorkerScriptController* controller = WorkerScriptController::controllerForContext();
+    WorkerContextExecutionProxy* proxy = controller ? controller->proxy() : 0;
+    if (!proxy)
+        return v8::Local<v8::Function>();
+
+    v8::Handle<v8::Context> context = proxy->context();
+    if (context.IsEmpty())
+        return v8::Local<v8::Function>();
+
+    return getConstructorForContext(type, context);
+}
+#endif
+
+void V8DOMWrapper::setHiddenReference(v8::Handle<v8::Object> parent, v8::Handle<v8::Value> child)
+{
+    v8::Local<v8::Value> hiddenReferenceObject = parent->GetInternalField(v8DOMHiddenReferenceArrayIndex);
+    if (hiddenReferenceObject->IsNull() || hiddenReferenceObject->IsUndefined()) {
+        hiddenReferenceObject = v8::Array::New();
+        parent->SetInternalField(v8DOMHiddenReferenceArrayIndex, hiddenReferenceObject);
+    }
+    v8::Local<v8::Array> hiddenReferenceArray = v8::Local<v8::Array>::Cast(hiddenReferenceObject);
+    hiddenReferenceArray->Set(v8::Integer::New(hiddenReferenceArray->Length()), child);
+}
+
+void V8DOMWrapper::setHiddenWindowReference(Frame* frame, v8::Handle<v8::Value> jsObject)
+{
+    // Get DOMWindow
+    if (!frame)
+        return; // Object might be detached from window
+    v8::Handle<v8::Context> context = V8Proxy::context(frame);
+    if (context.IsEmpty())
+        return;
+
+    v8::Handle<v8::Object> global = context->Global();
+    // Look for real DOM wrapper.
+    global = V8DOMWrapper::lookupDOMWrapper(V8DOMWindow::GetTemplate(), global);
+    ASSERT(!global.IsEmpty());
+
+    setHiddenReference(global, jsObject);
+}
+
+WrapperTypeInfo* V8DOMWrapper::domWrapperType(v8::Handle<v8::Object> object)
+{
+    ASSERT(V8DOMWrapper::maybeDOMWrapper(object));
+    return static_cast<WrapperTypeInfo*>(object->GetPointerFromInternalField(v8DOMWrapperTypeIndex));
+}
+
+PassRefPtr<NodeFilter> V8DOMWrapper::wrapNativeNodeFilter(v8::Handle<v8::Value> filter)
+{
+    // A NodeFilter is used when walking through a DOM tree or iterating tree
+    // nodes.
+    // FIXME: we may want to cache NodeFilterCondition and NodeFilter
+    // object, but it is minor.
+    // NodeFilter is passed to NodeIterator that has a ref counted pointer
+    // to NodeFilter. NodeFilter has a ref counted pointer to NodeFilterCondition.
+    // In NodeFilterCondition, filter object is persisted in its constructor,
+    // and disposed in its destructor.
+    if (!filter->IsFunction())
+        return 0;
+
+    return NodeFilter::create(V8NodeFilterCondition::create(filter));
+}
+
+static bool globalObjectPrototypeIsDOMWindow(v8::Handle<v8::Object> objectPrototype)
+{
+    // We can identify what type of context the global object is wrapping by looking at the
+    // internal field count of its prototype. This assumes WorkerContexts and DOMWindows have different numbers
+    // of internal fields, so a COMPILE_ASSERT is included to warn if this ever changes.
+#if ENABLE(WORKERS)
+    COMPILE_ASSERT(V8DOMWindow::internalFieldCount != V8WorkerContext::internalFieldCount,
+        DOMWindowAndWorkerContextHaveUnequalFieldCounts);
+    COMPILE_ASSERT(V8DOMWindow::internalFieldCount != V8DedicatedWorkerContext::internalFieldCount,
+        DOMWindowAndDedicatedWorkerContextHaveUnequalFieldCounts);
+#endif
+#if ENABLE(SHARED_WORKERS)
+    COMPILE_ASSERT(V8DOMWindow::internalFieldCount != V8SharedWorkerContext::internalFieldCount,
+        DOMWindowAndSharedWorkerContextHaveUnequalFieldCounts);
+#endif
+    return objectPrototype->InternalFieldCount() == V8DOMWindow::internalFieldCount;
+}
+
+v8::Local<v8::Object> V8DOMWrapper::instantiateV8Object(V8Proxy* proxy, WrapperTypeInfo* type, void* impl)
+{
+    WorkerContext* workerContext = 0;
+    if (V8IsolatedContext::getEntered()) {
+        // This effectively disables the wrapper cache for isolated worlds.
+        proxy = 0;
+        // FIXME: Do we need a wrapper cache for the isolated world?  We should
+        //        see if the performance gains are worth while.
+        // We'll get one once we give the isolated context a proper window shell.
+    } else if (!proxy) {
+        v8::Handle<v8::Context> context = v8::Context::GetCurrent();
+        if (!context.IsEmpty()) {
+            v8::Handle<v8::Object> globalPrototype = v8::Handle<v8::Object>::Cast(context->Global()->GetPrototype());
+            if (globalObjectPrototypeIsDOMWindow(globalPrototype))
+                proxy = V8Proxy::retrieve(V8DOMWindow::toNative(globalPrototype)->frame());
+#if ENABLE(WORKERS)
+            else
+                workerContext = V8WorkerContext::toNative(lookupDOMWrapper(V8WorkerContext::GetTemplate(), context->Global()));
+#endif
+        }
+    }
+
+    v8::Local<v8::Object> instance;
+    if (proxy)
+        // FIXME: Fix this to work properly with isolated worlds (see above).
+        instance = proxy->windowShell()->createWrapperFromCache(type);
+    else {
+        v8::Local<v8::Function> function;
+#if ENABLE(WORKERS)
+        if (workerContext)
+            function = getConstructor(type, workerContext);
+        else
+#endif
+            function = type->getTemplate()->GetFunction();
+        instance = SafeAllocation::newInstance(function);
+    }
+    if (!instance.IsEmpty()) {
+        // Avoid setting the DOM wrapper for failed allocations.
+        setDOMWrapper(instance, type, impl);
+    }
+    return instance;
+}
+
+#ifndef NDEBUG
+bool V8DOMWrapper::maybeDOMWrapper(v8::Handle<v8::Value> value)
+{
+    if (value.IsEmpty() || !value->IsObject())
+        return false;
+
+    v8::Handle<v8::Object> object = v8::Handle<v8::Object>::Cast(value);
+    if (!object->InternalFieldCount())
+        return false;
+
+    ASSERT(object->InternalFieldCount() >= v8DefaultWrapperInternalFieldCount);
+
+    v8::Handle<v8::Value> wrapper = object->GetInternalField(v8DOMWrapperObjectIndex);
+    ASSERT(wrapper->IsNumber() || wrapper->IsExternal());
+
+    return true;
+}
+#endif
+
+bool V8DOMWrapper::isValidDOMObject(v8::Handle<v8::Value> value)
+{
+    if (value.IsEmpty() || !value->IsObject())
+        return false;
+    return v8::Handle<v8::Object>::Cast(value)->InternalFieldCount();
+}
+
+bool V8DOMWrapper::isWrapperOfType(v8::Handle<v8::Value> value, WrapperTypeInfo* type)
+{
+    if (!isValidDOMObject(value))
+        return false;
+
+    v8::Handle<v8::Object> object = v8::Handle<v8::Object>::Cast(value);
+    ASSERT(object->InternalFieldCount() >= v8DefaultWrapperInternalFieldCount);
+
+    v8::Handle<v8::Value> wrapper = object->GetInternalField(v8DOMWrapperObjectIndex);
+    ASSERT(wrapper->IsNumber() || wrapper->IsExternal());
+
+    WrapperTypeInfo* typeInfo = static_cast<WrapperTypeInfo*>(object->GetPointerFromInternalField(v8DOMWrapperTypeIndex));
+    return typeInfo == type;
+}
+
+v8::Handle<v8::Object> V8DOMWrapper::getWrapper(Node* node)
+{
+    ASSERT(WTF::isMainThread());
+    V8IsolatedContext* context = V8IsolatedContext::getEntered();
+    if (LIKELY(!context)) {
+        v8::Persistent<v8::Object>* wrapper = node->wrapper();
+        if (!wrapper)
+            return v8::Handle<v8::Object>();
+        return *wrapper;
+    }
+
+    DOMNodeMapping& domNodeMap = context->world()->domDataStore()->domNodeMap();
+    return domNodeMap.get(node);
+}
+
+// A JS object of type EventTarget is limited to a small number of possible classes.
+// Check EventTarget.h for new type conversion methods
+v8::Handle<v8::Value> V8DOMWrapper::convertEventTargetToV8Object(EventTarget* target)
+{
+    if (!target)
+        return v8::Null();
+
+#if ENABLE(SVG)
+    if (SVGElementInstance* instance = target->toSVGElementInstance())
+        return toV8(instance);
+#endif
+
+#if ENABLE(WORKERS)
+    if (Worker* worker = target->toWorker())
+        return toV8(worker);
+
+    if (DedicatedWorkerContext* workerContext = target->toDedicatedWorkerContext())
+        return toV8(workerContext);
+#endif // WORKERS
+
+#if ENABLE(SHARED_WORKERS)
+    if (SharedWorker* sharedWorker = target->toSharedWorker())
+        return toV8(sharedWorker);
+
+    if (SharedWorkerContext* sharedWorkerContext = target->toSharedWorkerContext())
+        return toV8(sharedWorkerContext);
+#endif // SHARED_WORKERS
+
+#if ENABLE(NOTIFICATIONS)
+    if (Notification* notification = target->toNotification())
+        return toV8(notification);
+#endif
+
+#if ENABLE(INDEXED_DATABASE)
+    if (IDBRequest* idbRequest = target->toIDBRequest())
+        return toV8(idbRequest);
+#endif
+
+#if ENABLE(WEB_SOCKETS)
+    if (WebSocket* webSocket = target->toWebSocket())
+        return toV8(webSocket);
+#endif
+
+    if (Node* node = target->toNode())
+        return toV8(node);
+
+    if (DOMWindow* domWindow = target->toDOMWindow())
+        return toV8(domWindow);
+
+    // XMLHttpRequest is created within its JS counterpart.
+    if (XMLHttpRequest* xmlHttpRequest = target->toXMLHttpRequest()) {
+        v8::Handle<v8::Object> wrapper = getActiveDOMObjectMap().get(xmlHttpRequest);
+        ASSERT(!wrapper.IsEmpty());
+        return wrapper;
+    }
+
+    // MessagePort is created within its JS counterpart
+    if (MessagePort* port = target->toMessagePort()) {
+        v8::Handle<v8::Object> wrapper = getActiveDOMObjectMap().get(port);
+        ASSERT(!wrapper.IsEmpty());
+        return wrapper;
+    }
+
+    if (XMLHttpRequestUpload* upload = target->toXMLHttpRequestUpload()) {
+        v8::Handle<v8::Object> wrapper = getDOMObjectMap().get(upload);
+        ASSERT(!wrapper.IsEmpty());
+        return wrapper;
+    }
+
+#if ENABLE(OFFLINE_WEB_APPLICATIONS)
+    if (DOMApplicationCache* domAppCache = target->toDOMApplicationCache())
+        return toV8(domAppCache);
+#endif
+
+#if ENABLE(EVENTSOURCE)
+    if (EventSource* eventSource = target->toEventSource())
+        return toV8(eventSource);
+#endif
+
+#if ENABLE(FILE_READER)
+    if (FileReader* fileReader = target->toFileReader())
+        return toV8(fileReader);
+#endif
+
+    ASSERT(0);
+    return notHandledByInterceptor();
+}
+
+PassRefPtr<EventListener> V8DOMWrapper::getEventListener(v8::Local<v8::Value> value, bool isAttribute, ListenerLookupType lookup)
+{
+    v8::Handle<v8::Context> context = v8::Context::GetCurrent();
+    if (context.IsEmpty())
+        return 0;
+    if (lookup == ListenerFindOnly)
+        return V8EventListenerList::findWrapper(value, isAttribute);
+    v8::Handle<v8::Object> globalPrototype = v8::Handle<v8::Object>::Cast(context->Global()->GetPrototype());
+    if (globalObjectPrototypeIsDOMWindow(globalPrototype))
+        return V8EventListenerList::findOrCreateWrapper<V8EventListener>(value, isAttribute);
+#if ENABLE(WORKERS)
+    return V8EventListenerList::findOrCreateWrapper<V8WorkerContextEventListener>(value, isAttribute);
+#else
+    return 0;
+#endif
+}
+
+}  // namespace WebCore