DevTools: Async call stacks for Promises and Object.observe.

Source/core/inspector/AsyncCallStackTracker.cpp

 /*
  * Copyright (C) 2013 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
@@ skipping 21 matching lines @@
 #include "core/inspector/AsyncCallStackTracker.h"
 
 #include "bindings/core/v8/V8Binding.h"
 #include "bindings/core/v8/V8RecursionScope.h"
 #include "core/dom/ContextLifecycleObserver.h"
 #include "core/dom/ExecutionContext.h"
 #include "core/events/Event.h"
 #include "core/events/EventTarget.h"
 #include "core/xml/XMLHttpRequest.h"
 #include "core/xml/XMLHttpRequestUpload.h"
-#include "wtf/text/AtomicStringHash.h"
 #include "wtf/text/StringBuilder.h"
+#include "wtf/text/StringHash.h"
 #include <v8.h>
 
 namespace {
 
 static const char setTimeoutName[] = "setTimeout";
 static const char setIntervalName[] = "setInterval";
 static const char requestAnimationFrameName[] = "requestAnimationFrame";
 static const char xhrSendName[] = "XMLHttpRequest.send";
 static const char enqueueMutationRecordName[] = "Mutation";
 
@@ skipping 20 matching lines @@
     }
 
 public:
     AsyncCallStackTracker* m_tracker;
     HashSet<int> m_intervalTimerIds;
     HashMap<int, RefPtr<AsyncCallChain> > m_timerCallChains;
     HashMap<int, RefPtr<AsyncCallChain> > m_animationFrameCallChains;
     HashMap<Event*, RefPtr<AsyncCallChain> > m_eventCallChains;
     HashMap<EventTarget*, RefPtr<AsyncCallChain> > m_xhrCallChains;
     HashMap<MutationObserver*, RefPtr<AsyncCallChain> > m_mutationObserverCallChains;
+    HashMap<String, RefPtr<AsyncCallChain> > m_v8AsyncTaskCallChains;
 };
 
 static XMLHttpRequest* toXmlHttpRequest(EventTarget* eventTarget)
 {
     const AtomicString& interfaceName = eventTarget->interfaceName();
     if (interfaceName == EventTargetNames::XMLHttpRequest)
         return static_cast<XMLHttpRequest*>(eventTarget);
     if (interfaceName == EventTargetNames::XMLHttpRequestUpload)
         return static_cast<XMLHttpRequestUpload*>(eventTarget)->xmlHttpRequest();
     return 0;
@@ skipping 195 matching lines @@
 void AsyncCallStackTracker::willDeliverMutationRecords(ExecutionContext* context, MutationObserver* observer)
 {
     ASSERT(context);
     ASSERT(isEnabled());
     if (ExecutionContextData* data = m_executionContextDataMap.get(context))
         setCurrentAsyncCallChain(context, data->m_mutationObserverCallChains.take(observer));
     else
         setCurrentAsyncCallChain(context, nullptr);
 }
 
+static String makeV8AsyncTaskUniqueId(const String& eventName, int id)
+{
+    StringBuilder builder;
+    builder.append(eventName);
+    builder.appendNumber(id);
+    return builder.toString();
+}
+
+void AsyncCallStackTracker::didEnqueueV8AsyncTask(ExecutionContext* context, const String& eventName, int id, const ScriptValue& callFrames)
+{
+    ASSERT(context);
+    ASSERT(isEnabled());
+    if (!validateCallFrames(callFrames))
+        return;
+    ExecutionContextData* data = createContextDataIfNeeded(context);
+    data->m_v8AsyncTaskCallChains.set(makeV8AsyncTaskUniqueId(eventName, id), createAsyncCallChain(eventName, callFrames));
+}
+
+void AsyncCallStackTracker::willHandleV8AsyncTask(ExecutionContext* context, const String& eventName, int id)
+{
+    ASSERT(context);
+    ASSERT(isEnabled());
+    if (ExecutionContextData* data = m_executionContextDataMap.get(context))
+        setCurrentAsyncCallChain(context, data->m_v8AsyncTaskCallChains.take(makeV8AsyncTaskUniqueId(eventName, id)));
+    else
+        setCurrentAsyncCallChain(context, nullptr);
+}
+
 void AsyncCallStackTracker::didFireAsyncCall()
 {
     clearCurrentAsyncCallChain();
 }
 
 PassRefPtr<AsyncCallStackTracker::AsyncCallChain> AsyncCallStackTracker::createAsyncCallChain(const String& description, const ScriptValue& callFrames)
 {
+    if (callFrames.isEmpty()) {
+        ASSERT(m_currentAsyncCallChain);
+        return m_currentAsyncCallChain; // Propogate async call stack chain.
+    }
     RefPtr<AsyncCallChain> chain = adoptRef(m_currentAsyncCallChain ? new AsyncCallStackTracker::AsyncCallChain(*m_currentAsyncCallChain) : new AsyncCallStackTracker::AsyncCallChain());
     ensureMaxAsyncCallChainDepth(chain.get(), m_maxAsyncCallStackDepth - 1);
     chain->m_callStacks.prepend(adoptRef(new AsyncCallStackTracker::AsyncCallStack(description, callFrames)));
     return chain.release();
 }
 
 void AsyncCallStackTracker::setCurrentAsyncCallChain(ExecutionContext* context, PassRefPtr<AsyncCallChain> chain)
 {
     if (V8RecursionScope::recursionLevel(toIsolate(context))) {
         if (m_currentAsyncCallChain)
@@ skipping 15 matching lines @@
 }
 
 void AsyncCallStackTracker::ensureMaxAsyncCallChainDepth(AsyncCallChain* chain, unsigned maxDepth)
 {
     while (chain->m_callStacks.size() > maxDepth)
         chain->m_callStacks.removeLast();
 }
 
 bool AsyncCallStackTracker::validateCallFrames(const ScriptValue& callFrames)
 {
-    return !callFrames.isEmpty();
+    return !callFrames.isEmpty() || m_currentAsyncCallChain;
 }
 
 AsyncCallStackTracker::ExecutionContextData* AsyncCallStackTracker::createContextDataIfNeeded(ExecutionContext* context)
 {
     ExecutionContextData* data = m_executionContextDataMap.get(context);
     if (!data) {
         data = new AsyncCallStackTracker::ExecutionContextData(this, context);
         m_executionContextDataMap.set(context, data);
     }
     return data;
 }
 
 void AsyncCallStackTracker::clear()
 {
     m_currentAsyncCallChain.clear();
     m_nestedAsyncCallCount = 0;
     ExecutionContextDataMap copy;
     m_executionContextDataMap.swap(copy);
     for (ExecutionContextDataMap::const_iterator it = copy.begin(); it != copy.end(); ++it)
         delete it->value;
 }
 
 } // namespace WebCore