bytecode/DFGExitProfile.cpp

   1 /*
   2  * Copyright (C) 2011 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 #include "config.h"
  27 #include "DFGExitProfile.h"
  28
  29 #include <wtf/PassOwnPtr.h>
  30
  31 namespace JSC { namespace DFG {
  32
  33 ExitProfile::ExitProfile() { }
  34 ExitProfile::~ExitProfile() { }
  35
  36 bool ExitProfile::add(const FrequentExitSite& site)
  37 {
  38     // If we've never seen any frequent exits then create the list and put this site
  39     // into it.
  40     if (!m_frequentExitSites) {
  41         m_frequentExitSites = adoptPtr(new Vector<FrequentExitSite>());
  42         m_frequentExitSites->append(site);
  43         return true;
  44     }
  45
  46     // Don't add it if it's already there. This is O(n), but that's OK, because we
  47     // know that the total number of places where code exits tends to not be large,
  48     // and this code is only used when recompilation is triggered.
  49     for (unsigned i = 0; i < m_frequentExitSites->size(); ++i) {
  50         if (m_frequentExitSites->at(i) == site)
  51             return false;
  52     }
  53
  54     m_frequentExitSites->append(site);
  55     return true;
  56 }
  57
  58 Vector<FrequentExitSite> ExitProfile::exitSitesFor(unsigned bytecodeIndex)
  59 {
  60     Vector<FrequentExitSite> result;
  61
  62     if (!m_frequentExitSites)
  63         return result;
  64
  65     for (unsigned i = 0; i < m_frequentExitSites->size(); ++i) {
  66         if (m_frequentExitSites->at(i).bytecodeOffset() == bytecodeIndex)
  67             result.append(m_frequentExitSites->at(i));
  68     }
  69
  70     return result;
  71 }
  72
  73 bool ExitProfile::hasExitSite(const FrequentExitSite& site) const
  74 {
  75     if (!m_frequentExitSites)
  76         return false;
  77
  78     for (unsigned i = m_frequentExitSites->size(); i--;) {
  79         if (m_frequentExitSites->at(i) == site)
  80             return true;
  81     }
  82     return false;
  83 }
  84
  85 QueryableExitProfile::QueryableExitProfile(const ExitProfile& profile)
  86 {
  87     if (!profile.m_frequentExitSites)
  88         return;
  89
  90     for (unsigned i = 0; i < profile.m_frequentExitSites->size(); ++i)
  91         m_frequentExitSites.add(profile.m_frequentExitSites->at(i));
  92 }
  93
  94 QueryableExitProfile::~QueryableExitProfile() { }
  95
  96 } } // namespace JSC::DFG