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 "JSGlobalObject.h"
  33
  34 namespace JSC {
  35
  36 RegisterFile::~RegisterFile()
  37 {
  38 #if HAVE(MMAP)
  39     munmap(m_buffer, ((m_max - m_start) + m_maxGlobals) * sizeof(Register));
  40 #elif HAVE(VIRTUALALLOC)
  41 #if OS(WINCE)
  42     VirtualFree(m_buffer, DWORD(m_commitEnd) - DWORD(m_buffer), MEM_DECOMMIT);
  43 #endif
  44     VirtualFree(m_buffer, 0, MEM_RELEASE);
  45 #else
  46     fastFree(m_buffer);
  47 #endif
  48 }
  49
  50 void RegisterFile::releaseExcessCapacity()
  51 {
  52 #if HAVE(MMAP) && HAVE(MADV_FREE) && !HAVE(VIRTUALALLOC)
  53     while (madvise(m_start, (m_max - m_start) * sizeof(Register), MADV_FREE) == -1 && errno == EAGAIN) { }
  54 #elif HAVE(VIRTUALALLOC)
  55     VirtualFree(m_start, (m_max - m_start) * sizeof(Register), MEM_DECOMMIT);
  56     m_commitEnd = m_start;
  57 #endif
  58     m_maxUsed = m_start;
  59 }
  60
  61 void RegisterFile::setGlobalObject(JSGlobalObject* globalObject)
  62 {
  63     m_globalObject = globalObject;
  64 }
  65
  66 bool RegisterFile::clearGlobalObject(JSGlobalObject* globalObject)
  67 {
  68     return m_globalObject.clear(globalObject);
  69 }
  70
  71 JSGlobalObject* RegisterFile::globalObject()
  72 {
  73     return m_globalObject.get();
  74 }
  75
  76 } // namespace JSC