Reland of DevTools: extract V8DebuggerAgent interface, move it under .../inspector/v8

third_party/WebKit/Source/core/inspector/v8/V8AsyncCallTracker.cpp

Index: third_party/WebKit/Source/core/inspector/v8/V8AsyncCallTracker.cpp
diff --git a/third_party/WebKit/Source/core/inspector/v8/V8AsyncCallTracker.cpp b/third_party/WebKit/Source/core/inspector/v8/V8AsyncCallTracker.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..a9dd4ff6626f56f134639c141b7695b6ca8b117f
--- /dev/null
+++ b/third_party/WebKit/Source/core/inspector/v8/V8AsyncCallTracker.cpp
@@ -0,0 +1,138 @@
+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "config.h"
+#include "core/inspector/v8/V8AsyncCallTracker.h"
+
+#include "bindings/core/v8/V8PerContextData.h"
+#include "core/inspector/AsyncOperationMap.h"
+#include "platform/heap/Handle.h"
+#include "wtf/HashMap.h"
+#include "wtf/text/StringBuilder.h"
+#include "wtf/text/StringHash.h"
+#include "wtf/text/WTFString.h"
+
+namespace blink {
+
+namespace {
+
+static const char v8AsyncTaskEventEnqueue[] = "enqueue";
+static const char v8AsyncTaskEventWillHandle[] = "willHandle";
+static const char v8AsyncTaskEventDidHandle[] = "didHandle";
+
+}
+
+class V8AsyncCallTracker::V8ContextAsyncOperations final : public NoBaseWillBeGarbageCollectedFinalized<V8AsyncCallTracker::V8ContextAsyncOperations> {
+    WTF_MAKE_NONCOPYABLE(V8ContextAsyncOperations);
+public:
+    explicit V8ContextAsyncOperations(V8DebuggerAgentImpl* debuggerAgent)
+        : m_v8AsyncOperations(debuggerAgent)
+    {
+    }
+
+    ~V8ContextAsyncOperations()
+    {
+        ASSERT(m_v8AsyncOperations.hasBeenDisposed());
+    }
+
+    void dispose()
+    {
+        // FIXME: get rid of the dispose method and this class altogether once AsyncOperationMap is always allocated on C++ heap.
+        m_v8AsyncOperations.dispose();
+    }
+
+    DEFINE_INLINE_TRACE()
+    {
+#if ENABLE(OILPAN)
+        visitor->trace(m_v8AsyncOperations);
+#endif
+    }
+
+    AsyncOperationMap<String> m_v8AsyncOperations;
+};
+
+static String makeV8AsyncTaskUniqueId(const String& eventName, int id)
+{
+    StringBuilder builder;
+    builder.append(eventName);
+    builder.append(" -> ");
+    builder.appendNumber(id);
+    return builder.toString();
+}
+
+V8AsyncCallTracker::V8AsyncCallTracker(V8DebuggerAgentImpl* debuggerAgent) : m_debuggerAgent(debuggerAgent)
+{
+}
+
+V8AsyncCallTracker::~V8AsyncCallTracker()
+{
+    ASSERT(m_contextAsyncOperationMap.isEmpty());
+}
+
+DEFINE_TRACE(V8AsyncCallTracker)
+{
+#if ENABLE(OILPAN)
+    visitor->trace(m_contextAsyncOperationMap);
+    visitor->trace(m_debuggerAgent);
+#endif
+}
+
+void V8AsyncCallTracker::asyncCallTrackingStateChanged(bool)
+{
+}
+
+void V8AsyncCallTracker::resetAsyncOperations()
+{
+    for (auto& it : m_contextAsyncOperationMap) {
+        it.key->removeObserver(this);
+        it.value->dispose();
+    }
+    m_contextAsyncOperationMap.clear();
+}
+
+void V8AsyncCallTracker::willDisposeScriptState(ScriptState* state)
+{
+    m_contextAsyncOperationMap.remove(state);
+}
+
+void V8AsyncCallTracker::didReceiveV8AsyncTaskEvent(ScriptState* state, const String& eventType, const String& eventName, int id)
+{
+    ASSERT(m_debuggerAgent->trackingAsyncCalls());
+    if (eventType == v8AsyncTaskEventEnqueue)
+        didEnqueueV8AsyncTask(state, eventName, id);
+    else if (eventType == v8AsyncTaskEventWillHandle)
+        willHandleV8AsyncTask(state, eventName, id);
+    else if (eventType == v8AsyncTaskEventDidHandle)
+        m_debuggerAgent->traceAsyncCallbackCompleted();
+    else
+        ASSERT_NOT_REACHED();
+}
+
+void V8AsyncCallTracker::didEnqueueV8AsyncTask(ScriptState* state, const String& eventName, int id)
+{
+    ASSERT(state);
+    ASSERT(m_debuggerAgent->trackingAsyncCalls());
+    int operationId = m_debuggerAgent->traceAsyncOperationStarting(eventName);
+    if (!operationId)
+        return;
+    V8ContextAsyncOperations* contextCallChains = m_contextAsyncOperationMap.get(state);
+    if (!contextCallChains)
+        contextCallChains = m_contextAsyncOperationMap.set(state, adoptPtrWillBeNoop(new V8ContextAsyncOperations(m_debuggerAgent))).storedValue->value.get();
+    contextCallChains->m_v8AsyncOperations.set(makeV8AsyncTaskUniqueId(eventName, id), operationId);
+}
+
+void V8AsyncCallTracker::willHandleV8AsyncTask(ScriptState* state, const String& eventName, int id)
+{
+    ASSERT(state);
+    ASSERT(m_debuggerAgent->trackingAsyncCalls());
+    if (V8ContextAsyncOperations* contextCallChains = m_contextAsyncOperationMap.get(state)) {
+        String taskId = makeV8AsyncTaskUniqueId(eventName, id);
+        m_debuggerAgent->traceAsyncCallbackStarting(contextCallChains->m_v8AsyncOperations.get(taskId));
+        contextCallChains->m_v8AsyncOperations.remove(taskId);
+    } else {
+        m_debuggerAgent->traceAsyncCallbackStarting(V8DebuggerAgentImpl::unknownAsyncOperationId);
+    }
+}
+
+} // namespace blink