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    :  #ifndef SYZYGY_AGENT_ASAN_MEMORY_NOTIFIERS_NULL_MEMORY_NOTIFIER_H_
  16    :  #define SYZYGY_AGENT_ASAN_MEMORY_NOTIFIERS_NULL_MEMORY_NOTIFIER_H_
  17    :  
  18    :  #include "base/logging.h"
  19    :  #include "syzygy/agent/asan/memory_notifier.h"
  20    :  
  21    :  namespace agent {
  22    :  namespace asan {
  23    :  namespace memory_notifiers {
  24    :  
  25    :  // Dummy notifier, useful to test objects relying on a memory notifier.
  26    :  class NullMemoryNotifier : public MemoryNotifierInterface {
  27    :   public:
  28    :    // Constructor.
  29  E :    NullMemoryNotifier() { }
  30    :  
  31    :    // Virtual destructor.
  32  E :    virtual ~NullMemoryNotifier() { }
  33    :  
  34    :    // @name MemoryNotifierInterface implementation.
  35    :    // @{
  36  E :    virtual void NotifyInternalUse(const void* address, size_t size) { }
  37  E :    virtual void NotifyFutureHeapUse(const void* address, size_t size) { }
  38  E :    virtual void NotifyReturnedToOS(const void* address, size_t size) { }
  39    :    // @}
  40    :   private:
  41    :    DISALLOW_COPY_AND_ASSIGN(NullMemoryNotifier);
  42    :  };
  43    :  
  44    :  }  // namespace memory_notifiers
  45    :  }  // namespace asan
  46    :  }  // namespace agent
  47    :  
  48    :  #endif  // SYZYGY_AGENT_ASAN_MEMORY_NOTIFIERS_NULL_MEMORY_NOTIFIER_H_