interpreter/RegisterFile.cpp

   1 /*
   2  * Copyright (C) 2008 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  *
   8  * 1.  Redistributions of source code must retain the above copyright
   9  *     notice, this list of conditions and the following disclaimer.
  10  * 2.  Redistributions in binary form must reproduce the above copyright
  11  *     notice, this list of conditions and the following disclaimer in the
  12  *     documentation and/or other materials provided with the distribution.
  13  * 3.  Neither the name of Apple Computer, Inc. ("Apple") nor the names of
  14  *     its contributors may be used to endorse or promote products derived
  15  *     from this software without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
  18  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  19  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  20  * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
  21  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  22  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  23  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
  24  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  26  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27  */
  28
  29 #include "config.h"
  30 #include "RegisterFile.h"
  31
  32 #include "ConservativeRoots.h"
  33 #include "Interpreter.h"
  34
  35 namespace JSC {
  36
  37 static size_t committedBytesCount = 0;
  38
  39 static Mutex& registerFileStatisticsMutex()
  40 {
  41     DEFINE_STATIC_LOCAL(Mutex, staticMutex, ());
  42     return staticMutex;
  43 }
  44
  45 RegisterFile::~RegisterFile()
  46 {
  47     void* base = m_reservation.base();
  48     m_reservation.decommit(base, reinterpret_cast<intptr_t>(m_commitEnd) - reinterpret_cast<intptr_t>(base));
  49     addToCommittedByteCount(-(reinterpret_cast<intptr_t>(m_commitEnd) - reinterpret_cast<intptr_t>(base)));
  50     m_reservation.deallocate();
  51 }
  52
  53 bool RegisterFile::growSlowCase(Register* newEnd)
  54 {
  55     if (newEnd <= m_commitEnd) {
  56         m_end = newEnd;
  57         return true;
  58     }
  59
  60     long delta = roundUpAllocationSize(reinterpret_cast<char*>(newEnd) - reinterpret_cast<char*>(m_commitEnd), commitSize);
  61     if (reinterpret_cast<char*>(m_commitEnd) + delta > static_cast<char*>(m_reservation.base()) + m_reservation.size())
  62         return false;
  63
  64     m_reservation.commit(m_commitEnd, delta);
  65     addToCommittedByteCount(delta);
  66     m_commitEnd = reinterpret_cast_ptr<Register*>(reinterpret_cast<char*>(m_commitEnd) + delta);
  67     m_end = newEnd;
  68     return true;
  69 }
  70
  71 void RegisterFile::gatherConservativeRoots(ConservativeRoots& conservativeRoots)
  72 {
  73     conservativeRoots.add(begin(), end());
  74 }
  75
  76 void RegisterFile::gatherConservativeRoots(ConservativeRoots& conservativeRoots, DFGCodeBlocks& dfgCodeBlocks)
  77 {
  78     conservativeRoots.add(begin(), end(), dfgCodeBlocks);
  79 }
  80
  81 void RegisterFile::releaseExcessCapacity()
  82 {
  83     ptrdiff_t delta = reinterpret_cast<uintptr_t>(m_commitEnd) - reinterpret_cast<uintptr_t>(m_reservation.base());
  84     m_reservation.decommit(m_reservation.base(), delta);
  85     addToCommittedByteCount(-delta);
  86     m_commitEnd = static_cast<Register*>(m_reservation.base());
  87 }
  88
  89 void RegisterFile::initializeThreading()
  90 {
  91     registerFileStatisticsMutex();
  92 }
  93
  94 size_t RegisterFile::committedByteCount()
  95 {
  96     MutexLocker locker(registerFileStatisticsMutex());
  97     return committedBytesCount;
  98 }
  99
 100 void RegisterFile::addToCommittedByteCount(long byteCount)
 101 {
 102     MutexLocker locker(registerFileStatisticsMutex());
 103     ASSERT(static_cast<long>(committedBytesCount) + byteCount > -1);
 104     committedBytesCount += byteCount;
 105 }
 106
 107 } // namespace JSC