Instrument parser blocking script execution time.

third_party/WebKit/Source/core/dom/ScriptRunner.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
@@ skipping 30 matching lines @@
     , m_taskRunner(Platform::current()->currentThread()->scheduler()->loadingTaskRunner())
     , m_numberOfInOrderScriptsWithPendingNotification(0)
     , m_isSuspended(false)
 {
     DCHECK(document);
 #ifndef NDEBUG
     m_hasEverBeenSuspended = false;
 #endif
 }
 
-void ScriptRunner::queueScriptForExecution(ScriptLoader* scriptLoader, ExecutionType executionType)
+void ScriptRunner::queueScriptForExecution(ScriptLoader* scriptLoader, AsyncExecutionType executionType)
 {
     DCHECK(scriptLoader);
     m_document->incrementLoadEventDelayCount();
     switch (executionType) {
-    case ASYNC_EXECUTION:
+    case Async:
         m_pendingAsyncScripts.add(scriptLoader);
         break;
 
-    case IN_ORDER_EXECUTION:
+    case InOrder:
         m_pendingInOrderScripts.append(scriptLoader);
         m_numberOfInOrderScriptsWithPendingNotification++;
         break;
+    case None:
+        NOTREACHED();
+        break;
     }
 }
 
 void ScriptRunner::postTask(const WebTraceLocation& webTraceLocation)
 {
     m_taskRunner->postTask(webTraceLocation, WTF::bind(&ScriptRunner::executeTask, wrapWeakPersistent(this)));
 }
 
 void ScriptRunner::suspend()
 {
@@ skipping 23 matching lines @@
     while (!m_pendingInOrderScripts.isEmpty() && m_pendingInOrderScripts.first()->isReady()) {
         // A ScriptLoader that failed is responsible for cancelling itself
         // notifyScriptLoadError(); it continues this draining of ready scripts.
         if (m_pendingInOrderScripts.first()->errorOccurred())
             break;
         m_inOrderScriptsToExecuteSoon.append(m_pendingInOrderScripts.takeFirst());
         postTask(BLINK_FROM_HERE);
     }
 }
 
-void ScriptRunner::notifyScriptReady(ScriptLoader* scriptLoader, ExecutionType executionType)
+void ScriptRunner::notifyScriptReady(ScriptLoader* scriptLoader, AsyncExecutionType executionType)
 {
     SECURITY_CHECK(scriptLoader);
     switch (executionType) {
-    case ASYNC_EXECUTION:
+    case Async:
         // RELEASE_ASSERT makes us crash in a controlled way in error cases
         // where the ScriptLoader is associated with the wrong ScriptRunner
         // (otherwise we'd cause a use-after-free in ~ScriptRunner when it tries
         // to detach).
         SECURITY_CHECK(m_pendingAsyncScripts.contains(scriptLoader));
 
         m_pendingAsyncScripts.remove(scriptLoader);
         m_asyncScriptsToExecuteSoon.append(scriptLoader);
 
         postTask(BLINK_FROM_HERE);
 
         break;
 
-    case IN_ORDER_EXECUTION:
+    case InOrder:
         SECURITY_CHECK(m_numberOfInOrderScriptsWithPendingNotification > 0);
         m_numberOfInOrderScriptsWithPendingNotification--;
 
         scheduleReadyInOrderScripts();
 
         break;
+    case None:
+        NOTREACHED();
+        break;
     }
 }
 
 bool ScriptRunner::removePendingInOrderScript(ScriptLoader* scriptLoader)
 {
     for (auto it = m_pendingInOrderScripts.begin(); it != m_pendingInOrderScripts.end(); ++it) {
         if (*it == scriptLoader) {
             m_pendingInOrderScripts.remove(it);
             SECURITY_CHECK(m_numberOfInOrderScriptsWithPendingNotification > 0);
             m_numberOfInOrderScriptsWithPendingNotification--;
             return true;
         }
     }
     return false;
 }
 
-void ScriptRunner::notifyScriptLoadError(ScriptLoader* scriptLoader, ExecutionType executionType)
+void ScriptRunner::notifyScriptLoadError(ScriptLoader* scriptLoader, AsyncExecutionType executionType)
 {
     switch (executionType) {
-    case ASYNC_EXECUTION: {
+    case Async: {
         // SECURITY_CHECK makes us crash in a controlled way in error cases
         // where the ScriptLoader is associated with the wrong ScriptRunner
         // (otherwise we'd cause a use-after-free in ~ScriptRunner when it tries
         // to detach).
         SECURITY_CHECK(m_pendingAsyncScripts.contains(scriptLoader));
         m_pendingAsyncScripts.remove(scriptLoader);
         break;
     }
-    case IN_ORDER_EXECUTION:
+    case InOrder:
         SECURITY_CHECK(removePendingInOrderScript(scriptLoader));
         scheduleReadyInOrderScripts();
         break;
+    case None:
+        NOTREACHED();
+        break;
     }
     m_document->decrementLoadEventDelayCount();
 }
 
 void ScriptRunner::movePendingScript(Document& oldDocument, Document& newDocument, ScriptLoader* scriptLoader)
 {
     Document* newContextDocument = newDocument.contextDocument();
     if (!newContextDocument) {
         // Document's contextDocument() method will return no Document if the
         // following conditions both hold:
@@ skipping 13 matching lines @@
         DCHECK(!oldDocument.frame());
         oldContextDocument = &oldDocument;
     }
     if (oldContextDocument != newContextDocument)
         oldContextDocument->scriptRunner()->movePendingScript(newContextDocument->scriptRunner(), scriptLoader);
 }
 
 void ScriptRunner::movePendingScript(ScriptRunner* newRunner, ScriptLoader* scriptLoader)
 {
     if (m_pendingAsyncScripts.contains(scriptLoader)) {
-        newRunner->queueScriptForExecution(scriptLoader, ASYNC_EXECUTION);
+        newRunner->queueScriptForExecution(scriptLoader, Async);
         m_pendingAsyncScripts.remove(scriptLoader);
         m_document->decrementLoadEventDelayCount();
         return;
     }
     if (removePendingInOrderScript(scriptLoader)) {
-        newRunner->queueScriptForExecution(scriptLoader, IN_ORDER_EXECUTION);
+        newRunner->queueScriptForExecution(scriptLoader, InOrder);
         m_document->decrementLoadEventDelayCount();
     }
 }
 
 // Returns true if task was run, and false otherwise.
 bool ScriptRunner::executeTaskFromQueue(HeapDeque<Member<ScriptLoader>>* taskQueue)
 {
     if (taskQueue->isEmpty())
         return false;
     taskQueue->takeFirst()->execute();
@@ skipping 22 matching lines @@
 DEFINE_TRACE(ScriptRunner)
 {
     visitor->trace(m_document);
     visitor->trace(m_pendingInOrderScripts);
     visitor->trace(m_pendingAsyncScripts);
     visitor->trace(m_asyncScriptsToExecuteSoon);
     visitor->trace(m_inOrderScriptsToExecuteSoon);
 }
 
 } // namespace blink