1    :  // Copyright 2014 Google Inc. All Rights Reserved.
   2    :  //
   3    :  // Licensed under the Apache License, Version 2.0 (the "License");
   4    :  // you may not use this file except in compliance with the License.
   5    :  // You may obtain a copy of the License at
   6    :  //
   7    :  //     http://www.apache.org/licenses/LICENSE-2.0
   8    :  //
   9    :  // Unless required by applicable law or agreed to in writing, software
  10    :  // distributed under the License is distributed on an "AS IS" BASIS,
  11    :  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  12    :  // See the License for the specific language governing permissions and
  13    :  // limitations under the License.
  14    :  //
  15    :  // An implementation of HeapInterface that wraps the Windows heap API.
  16    :  
  17    :  #ifndef SYZYGY_AGENT_ASAN_HEAPS_WIN_HEAP_H_
  18    :  #define SYZYGY_AGENT_ASAN_HEAPS_WIN_HEAP_H_
  19    :  
  20    :  #include <windows.h>
  21    :  
  22    :  #include "base/logging.h"
  23    :  #include "syzygy/agent/asan/heap.h"
  24    :  #include "syzygy/common/recursive_lock.h"
  25    :  
  26  m :  namespace agent {
  27  m :  namespace asan {
  28  m :  namespace heaps {
  29    :  
  30  m :  class WinHeap : public HeapInterface {
  31  m :   public:
  32    :    // Constructor. Creates a heap that is owned uniquely by this object.
  33  m :    WinHeap();
  34    :  
  35    :    // Constructor that wraps an existing heap. Ownership of the heap remains
  36    :    // external to this object.
  37  m :    explicit WinHeap(HANDLE heap);
  38    :  
  39    :    // Destructor.
  40  m :    virtual ~WinHeap();
  41    :  
  42    :    // @name HeapInterface functions.
  43    :    // @{
  44  m :    virtual HeapType GetHeapType() const;
  45  m :    virtual uint32 GetHeapFeatures() const;
  46  m :    virtual void* Allocate(size_t bytes);
  47  m :    virtual bool Free(void* alloc);
  48  m :    virtual bool IsAllocated(const void* alloc);
  49  m :    virtual size_t GetAllocationSize(const void* alloc);
  50  m :    virtual void Lock();
  51  m :    virtual void Unlock();
  52  m :    virtual bool TryLock();
  53    :    // @}
  54    :  
  55  m :   protected:
  56    :    // The heap that is wrapped by this object.
  57  m :    HANDLE heap_;
  58    :  
  59    :    // If true then this object owns the wrapped heap.
  60  m :    bool own_heap_;
  61    :  
  62    :    // The lock that gates access to this heap. This is a little redundant as
  63    :    // the underlying heap has its own lock, but it allows 'try' locking
  64    :    // semantics by our manager and heap checker.
  65  m :    ::common::RecursiveLock lock_;
  66    :  
  67    :    // True if the heap lock itself is held. Under lock_.
  68  m :    bool heap_lock_held_;
  69    :  
  70  m :   private:
  71  m :    DISALLOW_COPY_AND_ASSIGN(WinHeap);
  72  m :  };
  73    :  
  74  m :  }  // namespace heaps
  75  m :  }  // namespace asan
  76  m :  }  // namespace agent
  77    :  
  78    :  #endif  // SYZYGY_AGENT_ASAN_HEAPS_WIN_HEAP_H_