jit/ExecutableAllocatorWin.cpp

   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  * 1. Redistributions of source code must retain the above copyright
   8  *    notice, this list of conditions and the following disclaimer.
   9  * 2. Redistributions in binary form must reproduce the above copyright
  10  *    notice, this list of conditions and the following disclaimer in the
  11  *    documentation and/or other materials provided with the distribution.
  12  *
  13  * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
  14  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  16  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
  17  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  18  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  19  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  20  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
  21  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  23  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  24  */
  25
  26 #include "config.h"
  27
  28 #include "ExecutableAllocator.h"
  29
  30 #if ENABLE(EXECUTABLE_ALLOCATOR_DEMAND) && OS(WINDOWS)
  31
  32 #include "windows.h"
  33
  34 namespace JSC {
  35
  36 void ExecutableAllocator::intializePageSize()
  37 {
  38     SYSTEM_INFO system_info;
  39     GetSystemInfo(&system_info);
  40     ExecutableAllocator::pageSize = system_info.dwPageSize;
  41 }
  42
  43 ExecutablePool::Allocation ExecutablePool::systemAlloc(size_t n)
  44 {
  45     void* allocation = VirtualAlloc(0, n, MEM_COMMIT | MEM_RESERVE, PAGE_EXECUTE_READWRITE);
  46     if (!allocation)
  47         CRASH();
  48     ExecutablePool::Allocation alloc = {reinterpret_cast<char*>(allocation), n};
  49     return alloc;
  50 }
  51
  52 void ExecutablePool::systemRelease(const ExecutablePool::Allocation& alloc)
  53 {
  54     VirtualFree(alloc.pages, 0, MEM_RELEASE);
  55 }
  56
  57 bool ExecutableAllocator::isValid() const
  58 {
  59     return true;
  60 }
  61
  62 #if ENABLE(ASSEMBLER_WX_EXCLUSIVE)
  63 #error "ASSEMBLER_WX_EXCLUSIVE not yet suported on this platform."
  64 #endif
  65
  66 }
  67
  68 #endif // HAVE(ASSEMBLER)