dfg/DFGOSRExitBase.h

   1 /*
   2  * Copyright (C) 2013 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 DFGOSRExitBase_h
  27 #define DFGOSRExitBase_h
  28
  29 #if ENABLE(DFG_JIT)
  30
  31 #include "CodeOrigin.h"
  32 #include "DFGExitProfile.h"
  33
  34 namespace JSC { namespace DFG {
  35
  36 struct BasicBlock;
  37 struct Node;
  38
  39 // Provides for the OSR exit profiling functionality that is common between the DFG
  40 // and the FTL.
  41
  42 struct OSRExitBase {
  43     OSRExitBase(ExitKind kind, CodeOrigin origin, CodeOrigin originForProfile)
  44         : m_kind(kind)
  45         , m_count(0)
  46         , m_codeOrigin(origin)
  47         , m_codeOriginForExitProfile(originForProfile)
  48     {
  49         ASSERT(m_codeOrigin.isSet());
  50         ASSERT(m_codeOriginForExitProfile.isSet());
  51     }
  52
  53     ExitKind m_kind;
  54     uint32_t m_count;
  55
  56     CodeOrigin m_codeOrigin;
  57     CodeOrigin m_codeOriginForExitProfile;
  58
  59 protected:
  60     bool considerAddingAsFrequentExitSite(CodeBlock* profiledCodeBlock, ExitingJITType jitType)
  61     {
  62         if (!m_count)
  63             return false;
  64         return considerAddingAsFrequentExitSiteSlow(profiledCodeBlock, jitType);
  65     }
  66
  67 private:
  68     bool considerAddingAsFrequentExitSiteSlow(CodeBlock* profiledCodeBlock, ExitingJITType);
  69 };
  70
  71 } } // namespace JSC::DFG
  72
  73 #endif // ENABLE(DFG_JIT)
  74
  75 #endif // DFGOSRExitBase_h
  76