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      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)
     52     {
     53     }
     54 #else
     55     PageAllocationAligned(void* base, size_t size, void* reservationBase, size_t reservationSize)
     56         : PageBlock(base, size)
     57         , m_reservation(reservationBase, reservationSize)
     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
     71