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comparison: js/src/yarr/OSAllocatorWin.cpp
js/src/yarr/OSAllocatorWin.cpp
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| 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 ***** */ | |
| 29 | |
| 30 #include "assembler/wtf/Platform.h" | |
| 31 | |
| 32 #if ENABLE_ASSEMBLER && WTF_OS_WINDOWS | |
| 33 | |
| 34 #include <windows.h> | |
| 35 #include "assembler/wtf/Assertions.h" | |
| 36 | |
| 37 #include "yarr/OSAllocator.h" | |
| 38 | |
| 39 namespace WTF { | |
| 40 | |
| 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 } | |
| 47 | |
| 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 } | |
| 55 | |
| 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 } | |
| 63 | |
| 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 } | |
| 70 | |
| 71 void OSAllocator::decommit(void* address, size_t bytes) | |
| 72 { | |
| 73 bool result = VirtualFree(address, bytes, MEM_DECOMMIT); | |
| 74 if (!result) | |
| 75 CRASH(); | |
| 76 } | |
| 77 | |
| 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 } | |
| 86 | |
| 87 } // namespace WTF | |
| 88 | |
| 89 #endif |
