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      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
    102