tools/CodeProfiling.h

   1 /*
   2  * Copyright (C) 2012 Apple 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
   6  * are met:
   7  * 1. Redistributions of source code must retain the above copyright
   8  *    notice, this list of conditions and the following disclaimer.
   9  * 2. Redistributions in binary form must reproduce the above copyright
  10  *    notice, this list of conditions and the following disclaimer in the
  11  *    documentation and/or other materials provided with the distribution.
  12  *
  13  * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
  14  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  16  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
  17  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  18  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  19  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  20  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
  21  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  23  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  24  */
  25
  26 #ifndef CodeProfiling_h
  27 #define CodeProfiling_h
  28
  29 namespace WTF {
  30
  31 class MetaAllocator;
  32 class MetaAllocatorTracker;
  33
  34 }
  35
  36 namespace JSC {
  37
  38 class CodeProfile;
  39 class SourceCode;
  40
  41 class CodeProfiling {
  42     enum Mode {
  43         Disabled,
  44         Enabled,
  45         Verbose,
  46         VeryVerbose
  47     };
  48
  49 public:
  50     CodeProfiling(const SourceCode& source)
  51         : m_active(enabled())
  52     {
  53         if (m_active)
  54             begin(source);
  55     }
  56
  57     ~CodeProfiling()
  58     {
  59         if (m_active)
  60             end();
  61     }
  62
  63     static bool enabled() { return s_mode != Disabled; }
  64     static bool beVerbose() { return s_mode >= Verbose; }
  65     static bool beVeryVerbose() { return s_mode >= VeryVerbose; }
  66
  67     static void notifyAllocator(WTF::MetaAllocator*);
  68     static void* getOwnerUIDForPC(void*);
  69     static void sample(void* pc, void** framePointer);
  70
  71 private:
  72     void begin(const SourceCode&);
  73     void end();
  74
  75     bool m_active;
  76
  77     static Mode s_mode;
  78     static WTF::MetaAllocatorTracker* s_tracker;
  79     static volatile CodeProfile* s_profileStack;
  80 };
  81
  82 }
  83
  84 #endif // CodeProfiling_h
  85