wtf/MallocZoneSupport.h

   1 /*
   2  * Copyright (C) 2007 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  *
   8  * 1.  Redistributions of source code must retain the above copyright
   9  *     notice, this list of conditions and the following disclaimer.
  10  * 2.  Redistributions in binary form must reproduce the above copyright
  11  *     notice, this list of conditions and the following disclaimer in the
  12  *     documentation and/or other materials provided with the distribution.
  13  * 3.  Neither the name of Apple Computer, Inc. ("Apple") nor the names of
  14  *     its contributors may be used to endorse or promote products derived
  15  *     from this software without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
  18  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  19  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  20  * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
  21  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  22  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  23  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
  24  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  26  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27  */
  28
  29 #ifndef MallocZoneSupport_h
  30 #define MallocZoneSupport_h
  31
  32 #include <malloc/malloc.h>
  33
  34 namespace WTF {
  35
  36 class RemoteMemoryReader {
  37     task_t m_task;
  38     memory_reader_t* m_reader;
  39
  40 public:
  41     RemoteMemoryReader(task_t task, memory_reader_t* reader)
  42         : m_task(task)
  43         , m_reader(reader)
  44     { }
  45
  46     void* operator()(vm_address_t address, size_t size) const
  47     {
  48         void* output;
  49         kern_return_t err = (*m_reader)(m_task, address, size, static_cast<void**>(&output));
  50         if (err)
  51             output = 0;
  52         return output;
  53     }
  54
  55     template <typename T>
  56     T* operator()(T* address, size_t size=sizeof(T)) const
  57     {
  58         return static_cast<T*>((*this)(reinterpret_cast<vm_address_t>(address), size));
  59     }
  60
  61     template <typename T>
  62     T* nextEntryInLinkedList(T** address) const
  63     {
  64         T** output = (*this)(address);
  65         if (!output)
  66             return 0;
  67         return *output;
  68     }
  69 };
  70
  71 } // namespace WTF
  72
  73 #endif // MallocZoneSupport_h