The Tor Browser: js/src/yarr/OSAllocatorWin.cpp@6474c204b198

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

     1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-

     2  * vim: set ts=8 sts=4 et sw=4 tw=99:

     3  *

     4  * ***** BEGIN LICENSE BLOCK *****

     5  * Copyright (C) 2010 Apple Inc. All rights reserved.

     6  *

     7  * Redistribution and use in source and binary forms, with or without

     8  * modification, are permitted provided that the following conditions

     9  * are met:

    10  * 1. Redistributions of source code must retain the above copyright

    11  *    notice, this list of conditions and the following disclaimer.

    12  * 2. Redistributions in binary form must reproduce the above copyright

    13  *    notice, this list of conditions and the following disclaimer in the

    14  *    documentation and/or other materials provided with the distribution.

    15  *

    16  * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''

    17  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,

    18  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR

    19  * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS

    20  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR

    21  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF

    22  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS

    23  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN

    24  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)

    25  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF

    26  * THE POSSIBILITY OF SUCH DAMAGE.

    27  *

    28  * ***** END LICENSE BLOCK ***** */

    30 #include "assembler/wtf/Platform.h"

    32 #if ENABLE_ASSEMBLER && WTF_OS_WINDOWS

    34 #include <windows.h>

    35 #include "assembler/wtf/Assertions.h"

    37 #include "yarr/OSAllocator.h"

    39 namespace WTF {

    41 static inline DWORD protection(bool writable, bool executable)

    42 {

    43     return executable ?

    44         (writable ? PAGE_EXECUTE_READWRITE : PAGE_EXECUTE_READ) :

    45         (writable ? PAGE_READWRITE : PAGE_READONLY);

    46 }

    48 void* OSAllocator::reserveUncommitted(size_t bytes, Usage, bool writable, bool executable)

    49 {

    50     void* result = VirtualAlloc(0, bytes, MEM_RESERVE, protection(writable, executable));

    51     if (!result)

    52         CRASH();

    53     return result;

    54 }

    56 void* OSAllocator::reserveAndCommit(size_t bytes, Usage, bool writable, bool executable)

    57 {

    58     void* result = VirtualAlloc(0, bytes, MEM_RESERVE | MEM_COMMIT, protection(writable, executable));

    59     if (!result)

    60         CRASH();

    61     return result;

    62 }

    64 void OSAllocator::commit(void* address, size_t bytes, bool writable, bool executable)

    65 {

    66     void* result = VirtualAlloc(address, bytes, MEM_COMMIT, protection(writable, executable));

    67     if (!result)

    68         CRASH();

    69 }

    71 void OSAllocator::decommit(void* address, size_t bytes)

    72 {

    73     bool result = VirtualFree(address, bytes, MEM_DECOMMIT);

    74     if (!result)

    75         CRASH();

    76 }

    78 void OSAllocator::releaseDecommitted(void* address, size_t bytes)

    79 {

    80     // According to http://msdn.microsoft.com/en-us/library/aa366892(VS.85).aspx,

    81     // dwSize must be 0 if dwFreeType is MEM_RELEASE.

    82     bool result = VirtualFree(address, 0, MEM_RELEASE);

    83     if (!result)

    84         CRASH();

    85 }

    87 } // namespace WTF

    89 #endif

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