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      1 /*
      2  * Copyright (C) 2013 Google Inc. All rights reserved.
      3  *
      4  * Redistribution and use in source and binary forms, with or without
      5  * modification, are permitted provided that the following conditions are
      6  * met:
      7  *
      8  *     * Redistributions of source code must retain the above copyright
      9  * notice, this list of conditions and the following disclaimer.
     10  *     * Redistributions in binary form must reproduce the above
     11  * copyright notice, this list of conditions and the following disclaimer
     12  * in the documentation and/or other materials provided with the
     13  * distribution.
     14  *     * Neither the name of Google Inc. nor the names of its
     15  * contributors may be used to endorse or promote products derived from
     16  * this software without specific prior written permission.
     17  *
     18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     19  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     20  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     21  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     22  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     23  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     24  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     25  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     26  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     27  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     28  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     29  */
     30 
     31 #ifndef AsyncCallStackTracker_h
     32 #define AsyncCallStackTracker_h
     33 
     34 #include "bindings/v8/ScriptValue.h"
     35 #include "wtf/Deque.h"
     36 #include "wtf/HashMap.h"
     37 #include "wtf/HashSet.h"
     38 #include "wtf/Noncopyable.h"
     39 #include "wtf/PassRefPtr.h"
     40 #include "wtf/RefPtr.h"
     41 
     42 namespace WebCore {
     43 
     44 class ExecutionContext;
     45 
     46 class AsyncCallStackTracker {
     47     WTF_MAKE_NONCOPYABLE(AsyncCallStackTracker);
     48 public:
     49     class AsyncCallStack : public RefCounted<AsyncCallStack> {
     50     public:
     51         AsyncCallStack(const String&, const ScriptValue&);
     52         ~AsyncCallStack();
     53         String description() const { return m_description; }
     54         ScriptValue callFrames() const { return m_callFrames; }
     55     private:
     56         String m_description;
     57         ScriptValue m_callFrames;
     58     };
     59 
     60     typedef Deque<RefPtr<AsyncCallStack>, 4> AsyncCallStackVector;
     61 
     62     class AsyncCallChain : public RefCounted<AsyncCallChain> {
     63     public:
     64         AsyncCallChain() { }
     65         AsyncCallChain(const AsyncCallChain& t) : m_callStacks(t.m_callStacks) { }
     66         AsyncCallStackVector callStacks() const { return m_callStacks; }
     67     private:
     68         friend class AsyncCallStackTracker;
     69         AsyncCallStackVector m_callStacks;
     70     };
     71 
     72     AsyncCallStackTracker();
     73 
     74     bool isEnabled() const { return m_maxAsyncCallStackDepth; }
     75     void setAsyncCallStackDepth(int);
     76     const AsyncCallChain* currentAsyncCallChain() const;
     77 
     78     void didInstallTimer(ExecutionContext*, int timerId, bool singleShot, const ScriptValue& callFrames);
     79     void didRemoveTimer(ExecutionContext*, int timerId);
     80     void willFireTimer(ExecutionContext*, int timerId);
     81 
     82     void didRequestAnimationFrame(ExecutionContext*, int callbackId, const ScriptValue& callFrames);
     83     void didCancelAnimationFrame(ExecutionContext*, int callbackId);
     84     void willFireAnimationFrame(ExecutionContext*, int callbackId);
     85 
     86     void didFireAsyncCall();
     87     void clear();
     88 
     89 private:
     90     PassRefPtr<AsyncCallChain> createAsyncCallChain(const String& description, const ScriptValue& callFrames);
     91     static void ensureMaxAsyncCallChainDepth(AsyncCallChain*, unsigned);
     92     static bool validateCallFrames(const ScriptValue& callFrames);
     93 
     94     class ExecutionContextData;
     95     void contextDestroyed(ExecutionContext*);
     96     ExecutionContextData* createContextDataIfNeeded(ExecutionContext*);
     97 
     98     unsigned m_maxAsyncCallStackDepth;
     99     RefPtr<AsyncCallChain> m_currentAsyncCallChain;
    100     HashMap<ExecutionContext*, ExecutionContextData*> m_executionContextDataMap;
    101 };
    102 
    103 } // namespace WebCore
    104 
    105 #endif // !defined(AsyncCallStackTracker_h)
    106