DevTools: Support asynchronous call stacks on backend.

Source/core/inspector/AsyncCallStackTracker.h

+/*
+ * 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
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "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 THE COPYRIGHT
+ * OWNER 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.
+ */
+
+#ifndef AsyncCallStackTracker_h
+#define AsyncCallStackTracker_h
+
+#include "bindings/v8/ScriptValue.h"
+#include "wtf/FastAllocBase.h"
+#include "wtf/HashMap.h"
+#include "wtf/HashSet.h"
+#include "wtf/Noncopyable.h"
+#include "wtf/PassRefPtr.h"
+#include "wtf/RefPtr.h"
+
+namespace WebCore {
+
+class AsyncCallStack : public RefCounted<AsyncCallStack> {
+private:
+    friend class AsyncCallStackTracker;

[yurys, 2013/11/20 01:23:43]

It seems that this class and the iterator should be nested in 
AsyncCallStackTracker. This way you wouldn't need this friendship and could make
all fields public.

[aandrey, 2013/11/20 15:20:02]

Done.

+    friend class AsyncCallStackIterator;
+    explicit AsyncCallStack(const RefPtr<AsyncCallStack>& next);

[yurys, 2013/11/20 01:23:43]

const RefPtr<AsyncCallStack>& ->  AsyncCallStack*

[aandrey, 2013/11/20 15:20:02]

Done.

+
+    ScriptValue m_callFrames;
+    RefPtr<AsyncCallStack> m_next;
+    int m_pathCount;
+};
+
+class AsyncCallStackIterator {
+public:
+    bool hasNext() const;
+    ScriptValue next();
+
+private:
+    friend class AsyncCallStackTracker;
+    AsyncCallStackIterator(const RefPtr<AsyncCallStack>& head, const RefPtr<AsyncCallStack>& tail);

[yurys, 2013/11/20 01:23:43]

Same thing, please use raw pointers instead of const RefPtr& or PassRefPtr if
you are releasing ref on the caller's side.

[aandrey, 2013/11/20 15:20:02]

Done.

+    RefPtr<AsyncCallStack> m_head;
+    RefPtr<AsyncCallStack> m_tail;
+};
+
+class AsyncCallStackTracker {
+    WTF_MAKE_NONCOPYABLE(AsyncCallStackTracker); WTF_MAKE_FAST_ALLOCATED;
+public:
+    AsyncCallStackTracker();
+
+    inline bool isEnabled() const { return m_maxAsyncCallStackDepth; }
+    void setMaxAsyncCallStackDepth(int);
+    AsyncCallStackIterator currentAsyncCallStack();
+
+    void didInstallTimer(int timerId, bool singleShot);
+    void didRemoveTimer(int timerId);
+    void willFireTimer(int timerId);
+
+    void didRequestAnimationFrame(int callbackId);
+    void didCancelAnimationFrame(int callbackId);
+    void willFireAnimationFrame(int callbackId);
+
+    void didAsyncCall();
+    void didRequestAsyncCallFrames(ScriptValue callFrames);
+
+    void clear();
+
+private:
+    const RefPtr<AsyncCallStack>& requestAsyncCallStack();

[yurys, 2013/11/20 01:23:43]

Should return raw pointer or PassRefPtr instead.

[aandrey, 2013/11/20 15:20:02]

Done.

+    void setCurrentAsyncCallStack(PassRefPtr<AsyncCallStack>, int delta);
+    void modifyPathCount(PassRefPtr<AsyncCallStack>, int delta);
+
+    int m_maxAsyncCallStackDepth;
+    int m_currentAsyncCallStackDelta;
+    RefPtr<AsyncCallStack> m_currentAsyncCallStack;
+    RefPtr<AsyncCallStack> m_requestedAsyncCallStack;
+    HashSet<int> m_intervalTimerIds;
+    HashMap<int, RefPtr<AsyncCallStack> > m_timerCallStacks;
+    HashMap<int, RefPtr<AsyncCallStack> > m_animationFrameCallStacks;
+};
+
+} // namespace WebCore
+
+#endif // !defined(AsyncCallStackTracker_h)