Stream scripts to V8 as they load - Blink side.

Source/core/dom/PendingScript.cpp

 /*
  * Copyright (C) 2010 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:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. 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.
  *
  * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``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 APPLE INC. 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 "core/dom/PendingScript.h"
 
+#include "bindings/core/v8/ScriptStreamer.h"
 #include "core/dom/Element.h"
 #include "core/fetch/ScriptResource.h"
 
 namespace blink {
 
 PendingScript::~PendingScript()
 {
 }
 
-void PendingScript::watchForLoad(ResourceClient* client)
+void PendingScript::watchForLoad(ScriptResourceClient* client)
 {
     ASSERT(!m_watchingForLoad);
     ASSERT(!resource()->isLoaded());
-    // addClient() will call notifyFinished() if the load is complete. Callers
-    // do not expect to be re-entered from this call, so they should not become
-    // a client of an already-loaded Resource.
-    resource()->addClient(client);
+    if (m_streamer) {
+        m_streamer->addClient(client);
+    } else {
+        // addClient() will call notifyFinished() if the load is
+        // complete. Callers do not expect to be re-entered from this call, so
+        // they should not become a client of an already-loaded Resource.
+        resource()->addClient(client);
+    }
     m_watchingForLoad = true;
 }
 
-void PendingScript::stopWatchingForLoad(ResourceClient* client)
+void PendingScript::stopWatchingForLoad(ScriptResourceClient* client)
 {
-    if (resource() && m_watchingForLoad) {
+    if (!m_watchingForLoad)
+        return;
+    ASSERT(resource());
+    if (m_streamer) {
+        m_streamer->cancel();
+        m_streamer->removeClient(client);
+        m_streamer.clear();
+    } else {
         resource()->removeClient(client);
-        m_watchingForLoad = false;
     }
+    m_watchingForLoad = false;
 }
 
 PassRefPtrWillBeRawPtr<Element> PendingScript::releaseElementAndClear()
 {
     setScriptResource(0);
     m_watchingForLoad = false;
     m_startingPosition = TextPosition::belowRangePosition();
     return m_element.release();
 }
 
 void PendingScript::setScriptResource(ScriptResource* resource)
 {
     setResource(resource);
+    // This function is only called 1) during construction (we're not yet
+    // streaming) 2) after loading has completed (and streaming too, if we were
+    // streaming).
+    ASSERT(!isStreaming());
+    m_streamer.release();
 }
 
-void PendingScript::notifyFinished(Resource*)
+void PendingScript::notifyFinished(Resource* resource)
 {
+    if (m_streamer)
+        m_streamer->notifyFinished(resource);
+}
+
+void PendingScript::notifyAppendData(ScriptResource* resource)
+{
+    if (m_streamer)
+        m_streamer->notifyAppendData(resource);
 }
 
 void PendingScript::trace(Visitor* visitor)
 {
     visitor->trace(m_element);
 }
 
 ScriptSourceCode PendingScript::getSource(const KURL& documentURL, bool& errorOccurred) const
 {
     if (resource()) {
         errorOccurred = resource()->errorOccurred();
         ASSERT(resource()->isLoaded());
+        if (m_streamer && !m_streamer->streamingSuppressed())
+            return ScriptSourceCode(m_streamer, resource());
         return ScriptSourceCode(resource());
     }
     errorOccurred = false;
     return ScriptSourceCode(m_element->textContent(), documentURL, startingPosition());
 }
 
+bool PendingScript::isStreaming() const
+{
+    return m_streamer && m_streamer->streamingInProgress();
 }
+
+}