michael@0: /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
michael@0:  * vim: set ts=8 sts=4 et sw=4 tw=99:
michael@0:  *
michael@0:  * ***** BEGIN LICENSE BLOCK *****
michael@0:  * Copyright (C) 2010 Apple Inc. All rights reserved.
michael@0:  *
michael@0:  * Redistribution and use in source and binary forms, with or without
michael@0:  * modification, are permitted provided that the following conditions
michael@0:  * are met:
michael@0:  * 1. Redistributions of source code must retain the above copyright
michael@0:  *    notice, this list of conditions and the following disclaimer.
michael@0:  * 2. Redistributions in binary form must reproduce the above copyright
michael@0:  *    notice, this list of conditions and the following disclaimer in the
michael@0:  *    documentation and/or other materials provided with the distribution.
michael@0:  *
michael@0:  * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
michael@0:  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
michael@0:  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
michael@0:  * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
michael@0:  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
michael@0:  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
michael@0:  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
michael@0:  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
michael@0:  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
michael@0:  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
michael@0:  * THE POSSIBILITY OF SUCH DAMAGE.
michael@0:  *
michael@0:  * ***** END LICENSE BLOCK ***** */
michael@0: 
michael@0: #include "assembler/wtf/Platform.h"
michael@0: 
michael@0: #if ENABLE_ASSEMBLER && WTF_OS_WINDOWS
michael@0: 
michael@0: #include <windows.h>
michael@0: #include "assembler/wtf/Assertions.h"
michael@0: 
michael@0: #include "yarr/OSAllocator.h"
michael@0: 
michael@0: namespace WTF {
michael@0: 
michael@0: static inline DWORD protection(bool writable, bool executable)
michael@0: {
michael@0:     return executable ?
michael@0:         (writable ? PAGE_EXECUTE_READWRITE : PAGE_EXECUTE_READ) :
michael@0:         (writable ? PAGE_READWRITE : PAGE_READONLY);
michael@0: }
michael@0: 
michael@0: void* OSAllocator::reserveUncommitted(size_t bytes, Usage, bool writable, bool executable)
michael@0: {
michael@0:     void* result = VirtualAlloc(0, bytes, MEM_RESERVE, protection(writable, executable));
michael@0:     if (!result)
michael@0:         CRASH();
michael@0:     return result;
michael@0: }
michael@0: 
michael@0: void* OSAllocator::reserveAndCommit(size_t bytes, Usage, bool writable, bool executable)
michael@0: {
michael@0:     void* result = VirtualAlloc(0, bytes, MEM_RESERVE | MEM_COMMIT, protection(writable, executable));
michael@0:     if (!result)
michael@0:         CRASH();
michael@0:     return result;
michael@0: }
michael@0: 
michael@0: void OSAllocator::commit(void* address, size_t bytes, bool writable, bool executable)
michael@0: {
michael@0:     void* result = VirtualAlloc(address, bytes, MEM_COMMIT, protection(writable, executable));
michael@0:     if (!result)
michael@0:         CRASH();
michael@0: }
michael@0: 
michael@0: void OSAllocator::decommit(void* address, size_t bytes)
michael@0: {
michael@0:     bool result = VirtualFree(address, bytes, MEM_DECOMMIT);
michael@0:     if (!result)
michael@0:         CRASH();
michael@0: }
michael@0: 
michael@0: void OSAllocator::releaseDecommitted(void* address, size_t bytes)
michael@0: {
michael@0:     // According to http://msdn.microsoft.com/en-us/library/aa366892(VS.85).aspx,
michael@0:     // dwSize must be 0 if dwFreeType is MEM_RELEASE.
michael@0:     bool result = VirtualFree(address, 0, MEM_RELEASE);
michael@0:     if (!result)
michael@0:         CRASH();
michael@0: }
michael@0: 
michael@0: } // namespace WTF
michael@0: 
michael@0: #endif