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 #include "JSGlobalData.h"
  35 #include "JSGlobalObject.h"
  36
  37 namespace JSC {
  38
  39 static size_t committedBytesCount = 0;
  40
  41 static Mutex& registerFileStatisticsMutex()
  42 {
  43     DEFINE_STATIC_LOCAL(Mutex, staticMutex, ());
  44     return staticMutex;
  45 }
  46
  47 RegisterFile::~RegisterFile()
  48 {
  49     void* base = m_reservation.base();
  50     m_reservation.decommit(base, reinterpret_cast<intptr_t>(m_commitEnd) - reinterpret_cast<intptr_t>(base));
  51     addToCommittedByteCount(-(reinterpret_cast<intptr_t>(m_commitEnd) - reinterpret_cast<intptr_t>(base)));
  52     m_reservation.deallocate();
  53 }
  54
  55 void RegisterFile::gatherConservativeRoots(ConservativeRoots& conservativeRoots)
  56 {
  57     for (Register* it = start(); it != end(); ++it) {
  58         JSValue v = it->jsValue();
  59         if (!v.isCell())
  60             continue;
  61         conservativeRoots.add(v.asCell());
  62     }
  63 }
  64
  65 void RegisterFile::releaseExcessCapacity()
  66 {
  67     m_reservation.decommit(m_start, reinterpret_cast<intptr_t>(m_commitEnd) - reinterpret_cast<intptr_t>(m_start));
  68     addToCommittedByteCount(-(reinterpret_cast<intptr_t>(m_commitEnd) - reinterpret_cast<intptr_t>(m_start)));
  69     m_commitEnd = m_start;
  70     m_maxUsed = m_start;
  71 }
  72
  73 void RegisterFile::setGlobalObject(JSGlobalObject* globalObject)
  74 {
  75     m_globalObject.set(globalObject->globalData(), globalObject, &m_globalObjectOwner, this);
  76 }
  77
  78 JSGlobalObject* RegisterFile::globalObject()
  79 {
  80     return m_globalObject.get();
  81 }
  82
  83 void RegisterFile::initializeThreading()
  84 {
  85     registerFileStatisticsMutex();
  86 }
  87
  88 size_t RegisterFile::committedByteCount()
  89 {
  90     MutexLocker locker(registerFileStatisticsMutex());
  91     return committedBytesCount;
  92 }
  93
  94 void RegisterFile::addToCommittedByteCount(long byteCount)
  95 {
  96     MutexLocker locker(registerFileStatisticsMutex());
  97     ASSERT(static_cast<long>(committedBytesCount) + byteCount > -1);
  98     committedBytesCount += byteCount;
  99 }
 100
 101 } // namespace JSC