bytecode/LazyOperandValueProfile.cpp

   1 /*
   2  * Copyright (C) 2012, 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 #include "config.h"
  27 #include "LazyOperandValueProfile.h"
  28
  29 #include "JSCInlines.h"
  30
  31 namespace JSC {
  32
  33 CompressedLazyOperandValueProfileHolder::CompressedLazyOperandValueProfileHolder() { }
  34 CompressedLazyOperandValueProfileHolder::~CompressedLazyOperandValueProfileHolder() { }
  35
  36 void CompressedLazyOperandValueProfileHolder::computeUpdatedPredictions(const ConcurrentJITLocker& locker)
  37 {
  38     if (!m_data)
  39         return;
  40
  41     for (unsigned i = 0; i < m_data->size(); ++i)
  42         m_data->at(i).computeUpdatedPrediction(locker);
  43 }
  44
  45 LazyOperandValueProfile* CompressedLazyOperandValueProfileHolder::add(
  46     const ConcurrentJITLocker&, const LazyOperandValueProfileKey& key)
  47 {
  48     if (!m_data)
  49         m_data = adoptPtr(new LazyOperandValueProfile::List());
  50     else {
  51         for (unsigned i = 0; i < m_data->size(); ++i) {
  52             if (m_data->at(i).key() == key)
  53                 return &m_data->at(i);
  54         }
  55     }
  56
  57     m_data->append(LazyOperandValueProfile(key));
  58     return &m_data->last();
  59 }
  60
  61 LazyOperandValueProfileParser::LazyOperandValueProfileParser() { }
  62 LazyOperandValueProfileParser::~LazyOperandValueProfileParser() { }
  63
  64 void LazyOperandValueProfileParser::initialize(
  65     const ConcurrentJITLocker&, CompressedLazyOperandValueProfileHolder& holder)
  66 {
  67     ASSERT(m_map.isEmpty());
  68
  69     if (!holder.m_data)
  70         return;
  71
  72     LazyOperandValueProfile::List& data = *holder.m_data;
  73     for (unsigned i = 0; i < data.size(); ++i)
  74         m_map.add(data[i].key(), &data[i]);
  75 }
  76
  77 LazyOperandValueProfile* LazyOperandValueProfileParser::getIfPresent(
  78     const LazyOperandValueProfileKey& key) const
  79 {
  80     HashMap<LazyOperandValueProfileKey, LazyOperandValueProfile*>::const_iterator iter =
  81         m_map.find(key);
  82
  83     if (iter == m_map.end())
  84         return 0;
  85
  86     return iter->value;
  87 }
  88
  89 SpeculatedType LazyOperandValueProfileParser::prediction(
  90     const ConcurrentJITLocker& locker, const LazyOperandValueProfileKey& key) const
  91 {
  92     LazyOperandValueProfile* profile = getIfPresent(key);
  93     if (!profile)
  94         return SpecNone;
  95
  96     return profile->computeUpdatedPrediction(locker);
  97 }
  98
  99 } // namespace JSC
 100