text: /*
   * Copyright (C) 2017 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. 
   */
  
  #pragma once
  
  #include "IsoConfig.h"
  #include "Mutex.h"
  
  namespace bmalloc {
  
  template<typename Config> class IsoHeapImpl;
  
  namespace api {
  
  // You have to declare IsoHeaps this way:
  //
  // static IsoHeap<type> myTypeHeap;
  //
  // It's not valid to create an IsoHeap except in static storage.
  
  template<typename Type>
  struct IsoHeap {
      typedef IsoConfig<sizeof(Type)> Config;
      
      void* allocate();
      void* tryAllocate();
      void deallocate(void* p);
      
      void scavenge();
      
      bool isInitialized();
      
      unsigned allocatorOffset() { return m_allocatorOffsetPlusOne - 1; }
      void setAllocatorOffset(unsigned value) { m_allocatorOffsetPlusOne = value + 1; }
      
      unsigned deallocatorOffset() { return m_deallocatorOffsetPlusOne - 1; }
      void setDeallocatorOffset(unsigned value) { m_deallocatorOffsetPlusOne = value + 1; }
      
      IsoHeapImpl<Config>& impl();
      
      Mutex m_initializationLock;
      unsigned m_allocatorOffsetPlusOne;
      unsigned m_deallocatorOffsetPlusOne;
      IsoHeapImpl<Config>* m_impl;
  };
  
  // Use this together with MAKE_BISO_MALLOCED_IMPL.
  #define MAKE_BISO_MALLOCED(isoType, exportMacro) \
  public: \
      static exportMacro ::bmalloc::api::IsoHeap<isoType>& bisoHeap(); \
      \
      void* operator new(size_t, void* p) { return p; } \
      void* operator new[](size_t, void* p) { return p; } \
      \
      exportMacro void* operator new(size_t size);\
      exportMacro void operator delete(void* p);\
      \
      void* operator new[](size_t size) = delete; \
      void operator delete[](void* p) = delete; \
  private: \
  typedef int __makeBisoMallocedMacroSemicolonifier
  
  } } // namespace bmalloc::api
  