heap/SuperRegion.h

   1 /*
   2  * Copyright (C) 2013 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 SuperRegion_h
  27 #define SuperRegion_h
  28
  29 #include <wtf/MetaAllocator.h>
  30 #include <wtf/PageBlock.h>
  31 #include <wtf/PageReservation.h>
  32
  33 namespace JSC {
  34
  35 class VM;
  36
  37 class SuperRegion : public WTF::MetaAllocator {
  38 public:
  39     SuperRegion();
  40     virtual ~SuperRegion();
  41
  42 protected:
  43     virtual void* allocateNewSpace(size_t&);
  44     virtual void notifyNeedPage(void*);
  45     virtual void notifyPageIsFree(void*);
  46
  47 private:
  48     static const uint64_t s_fixedHeapMemoryPoolSize;
  49
  50     static void* getAlignedBase(PageReservation&);
  51
  52     PageReservation m_reservation;
  53     void* m_reservationBase;
  54 };
  55
  56 } // namespace JSC
  57
  58 #endif // SuperRegion_h