Instrument parser blocking script execution time.

third_party/WebKit/Source/core/dom/ScriptLoader.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008 Apple Inc. All rights reserved.
  * Copyright (C) 2008 Nikolas Zimmermann <zimmermann@kde.org>
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
@@ skipping 10 matching lines @@
  * Boston, MA 02110-1301, USA.
  */
 
 #include "core/dom/ScriptLoader.h"
 
 #include "bindings/core/v8/ScriptController.h"
 #include "bindings/core/v8/ScriptSourceCode.h"
 #include "core/HTMLNames.h"
 #include "core/SVGNames.h"
 #include "core/dom/Document.h"
+#include "core/dom/DocumentParserTiming.h"
 #include "core/dom/IgnoreDestructiveWriteCountIncrementer.h"
 #include "core/dom/ScriptLoaderClient.h"
 #include "core/dom/ScriptRunner.h"
 #include "core/dom/ScriptableDocumentParser.h"
 #include "core/dom/Text.h"
 #include "core/events/Event.h"
 #include "core/fetch/AccessControlStatus.h"
 #include "core/fetch/FetchRequest.h"
 #include "core/fetch/ResourceFetcher.h"
 #include "core/fetch/ScriptResource.h"
@@ skipping 18 matching lines @@
 
 ScriptLoader::ScriptLoader(Element* element, bool parserInserted, bool alreadyStarted, bool createdDuringDocumentWrite)
     : m_element(element)
     , m_startLineNumber(WTF::OrdinalNumber::beforeFirst())
     , m_parserInserted(parserInserted)
     , m_isExternalScript(false)
     , m_alreadyStarted(alreadyStarted)
     , m_haveFiredLoad(false)
     , m_willBeParserExecuted(false)
     , m_readyToBeParserExecuted(false)
-    , m_willExecuteInOrder(false)
     , m_willExecuteWhenDocumentFinishedParsing(false)
     , m_forceAsync(!parserInserted)
     , m_createdDuringDocumentWrite(createdDuringDocumentWrite)
 {
     DCHECK(m_element);
     if (parserInserted && element->document().scriptableDocumentParser() && !element->document().isInDocumentWrite())
         m_startLineNumber = element->document().scriptableDocumentParser()->lineNumber();
 }
 
 ScriptLoader::~ScriptLoader()
@@ skipping 167 matching lines @@
     if (client->hasSourceAttribute() && client->deferAttributeValue() && m_parserInserted && !client->asyncAttributeValue()) {
         m_willExecuteWhenDocumentFinishedParsing = true;
         m_willBeParserExecuted = true;
     } else if (client->hasSourceAttribute() && m_parserInserted && !client->asyncAttributeValue()) {
         m_willBeParserExecuted = true;
     } else if (!client->hasSourceAttribute() && m_parserInserted && !elementDocument.isScriptExecutionReady()) {
         m_willBeParserExecuted = true;
         m_readyToBeParserExecuted = true;
     } else if (client->hasSourceAttribute() && !client->asyncAttributeValue() && !m_forceAsync) {
         m_pendingScript = PendingScript::create(m_element, m_resource.get());
-        m_willExecuteInOrder = true;
-        contextDocument->scriptRunner()->queueScriptForExecution(this, ScriptRunner::IN_ORDER_EXECUTION);
+        m_asyncExecType = ScriptRunner::IN_ORDER_EXECUTION;
+        contextDocument->scriptRunner()->queueScriptForExecution(this, m_asyncExecType.value());
         // Note that watchForLoad can immediately call notifyFinished.
         m_pendingScript->watchForLoad(this);
     } else if (client->hasSourceAttribute()) {
         m_pendingScript = PendingScript::create(m_element, m_resource.get());
+        m_asyncExecType = ScriptRunner::ASYNC_EXECUTION;
         LocalFrame* frame = m_element->document().frame();
         if (frame) {
             ScriptState* scriptState = ScriptState::forMainWorld(frame);
             if (scriptState)
                 ScriptStreamer::startStreaming(m_pendingScript.get(), ScriptStreamer::Async, frame->settings(), scriptState, frame->frameScheduler()->loadingTaskRunner());
         }
-        contextDocument->scriptRunner()->queueScriptForExecution(this, ScriptRunner::ASYNC_EXECUTION);
+        contextDocument->scriptRunner()->queueScriptForExecution(this, m_asyncExecType.value());
         // Note that watchForLoad can immediately call notifyFinished.
         m_pendingScript->watchForLoad(this);
     } else {
         // Reset line numbering for nested writes.
         TextPosition position = elementDocument.isInDocumentWrite() ? TextPosition() : scriptStartPosition;
         KURL scriptURL = (!elementDocument.isInDocumentWrite() && m_parserInserted) ? elementDocument.url() : KURL();
         if (!executeScript(ScriptSourceCode(scriptContent(), scriptURL, position))) {
             dispatchErrorEvent();
             return false;
         }
@@ skipping 69 matching lines @@
     bool sameOrigin = m_element->document().getSecurityOrigin()->canRequest(m_resource->url());
     if (expectedJs) {
         return;
     }
     UseCounter::Feature feature = sameOrigin ? (text ? UseCounter::SameOriginTextScript : application ? UseCounter::SameOriginApplicationScript : UseCounter::SameOriginOtherScript) : (text ? UseCounter::CrossOriginTextScript : application ? UseCounter::CrossOriginApplicationScript : UseCounter::CrossOriginOtherScript);
     UseCounter::count(frame, feature);
 }
 
 bool ScriptLoader::executeScript(const ScriptSourceCode& sourceCode)
 {
+    double scriptExecStartTime = monotonicallyIncreasingTime();
+    bool result = doExecuteScript(sourceCode);
+
+    // NOTE: we do not check m_willBeParserExecuted here, since
+    // m_willBeParserExecuted is false for inline scripts, and we want to
+    // include inline script execution time as part of parser blocked script
+    // execution time.
+    if (!m_asyncExecType)
+        DocumentParserTiming::from(m_element->document()).recordParserBlockedOnScriptExecutionDuration(monotonicallyIncreasingTime() - scriptExecStartTime, wasCreatedDuringDocumentWrite());
+    return result;
+}
+
+bool ScriptLoader::doExecuteScript(const ScriptSourceCode& sourceCode)
+{
     DCHECK(m_alreadyStarted);
 
     if (sourceCode.isEmpty())
         return true;
 
     Document* elementDocument = &(m_element->document());
     Document* contextDocument = elementDocument->contextDocument();
     if (!contextDocument)
         return true;
 
@@ skipping 63 matching lines @@
         DCHECK(contextDocument->currentScript() == m_element);
         contextDocument->popCurrentScript();
     }
 
     return true;
 }
 
 void ScriptLoader::execute()
 {
     DCHECK(!m_willBeParserExecuted);
+    DCHECK(m_asyncExecType);
     DCHECK(m_pendingScript->resource());
     bool errorOccurred = false;
     ScriptSourceCode source = m_pendingScript->getSource(KURL(), errorOccurred);
     Element* element = m_pendingScript->releaseElementAndClear();
     ALLOW_UNUSED_LOCAL(element);
     if (errorOccurred) {
         dispatchErrorEvent();
     } else if (!m_resource->wasCanceled()) {
         if (executeScript(source))
             dispatchLoadEvent();
         else
             dispatchErrorEvent();
     }
     m_resource = nullptr;
 }
 
 void ScriptLoader::notifyFinished(Resource* resource)
 {
     DCHECK(!m_willBeParserExecuted);
+    DCHECK(m_asyncExecType);
 
     Document* contextDocument = m_element->document().contextDocument();
     if (!contextDocument) {
         detach();
         return;
     }
 
     ASSERT_UNUSED(resource, resource == m_resource);
 
-    ScriptRunner::ExecutionType runOrder = m_willExecuteInOrder ? ScriptRunner::IN_ORDER_EXECUTION : ScriptRunner::ASYNC_EXECUTION;
     if (m_resource->errorOccurred()) {
-        contextDocument->scriptRunner()->notifyScriptLoadError(this, runOrder);
+        contextDocument->scriptRunner()->notifyScriptLoadError(this, m_asyncExecType.value());
         detach();
         dispatchErrorEvent();
         return;
     }
-    contextDocument->scriptRunner()->notifyScriptReady(this, runOrder);
+    contextDocument->scriptRunner()->notifyScriptReady(this, m_asyncExecType.value());
     m_pendingScript->stopWatchingForLoad();
 }
 
 bool ScriptLoader::ignoresLoadRequest() const
 {
     return m_alreadyStarted || m_isExternalScript || m_parserInserted || !element() || !element()->isConnected();
 }
 
 bool ScriptLoader::isScriptForEventSupported() const
 {
@@ skipping 31 matching lines @@
     if (isHTMLScriptLoader(element))
         return toHTMLScriptElement(element)->loader();
 
     if (isSVGScriptLoader(element))
         return toSVGScriptElement(element)->loader();
 
     return 0;
 }
 
 } // namespace blink