JavaScriptCore/jit/ExecutableAllocatorWin.cpp

/*
 * Copyright (C) 2008 Apple Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 
 */

#include "config.h"

#include "ExecutableAllocator.h"

#if ENABLE(ASSEMBLER)

#include "windows.h"

namespace JSC {

void ExecutableAllocator::intializePageSize()
{
    SYSTEM_INFO system_info;
    GetSystemInfo(&system_info);
    ExecutableAllocator::pageSize = system_info.dwPageSize;
}

ExecutablePool::Allocation ExecutablePool::systemAlloc(size_t n)
{
    void* allocation = VirtualAlloc(0, n, MEM_COMMIT | MEM_RESERVE, PAGE_EXECUTE_READWRITE);
    if (!allocation)
        CRASH();
    ExecutablePool::Allocation alloc = {reinterpret_cast<char*>(allocation), n};
    return alloc;
}

void ExecutablePool::systemRelease(const ExecutablePool::Allocation& alloc)
{ 
    VirtualFree(alloc.pages, 0, MEM_RELEASE); 
}

#if ENABLE(ASSEMBLER_WX_EXCLUSIVE)
#error "ASSEMBLER_WX_EXCLUSIVE not yet suported on this platform."
#endif

}

#endif // HAVE(ASSEMBLER)