wtf/PageAllocationAligned.h

   1 /*
   2  * Copyright (C) 2010 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. AND ITS CONTRIBUTORS ``AS IS''
  14  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
  15  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  16  * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
  17  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  18  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  19  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  20  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  21  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  22  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
  23  * THE POSSIBILITY OF SUCH DAMAGE.
  24  */
  25
  26 #ifndef PageAllocationAligned_h
  27 #define PageAllocationAligned_h
  28
  29 #include <wtf/OSAllocator.h>
  30 #include <wtf/PageReservation.h>
  31
  32 namespace WTF {
  33
  34 class PageAllocationAligned : private PageBlock {
  35 public:
  36     PageAllocationAligned()
  37     {
  38     }
  39
  40     using PageBlock::operator bool;
  41     using PageBlock::size;
  42     using PageBlock::base;
  43
  44     static PageAllocationAligned allocate(size_t size, size_t alignment, OSAllocator::Usage usage = OSAllocator::UnknownUsage, bool writable = true, bool executable = false);
  45
  46     void deallocate();
  47
  48 private:
  49 #if OS(DARWIN)
  50     PageAllocationAligned(void* base, size_t size)
  51         : PageBlock(base, size, false)
  52     {
  53     }
  54 #else
  55     PageAllocationAligned(void* base, size_t size, void* reservationBase, size_t reservationSize)
  56         : PageBlock(base, size, false)
  57         , m_reservation(reservationBase, reservationSize, false)
  58     {
  59     }
  60
  61     PageBlock m_reservation;
  62 #endif
  63 };
  64
  65
  66 } // namespace WTF
  67
  68 using WTF::PageAllocationAligned;
  69
  70 #endif // PageAllocationAligned_h