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