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    :  #include "syzygy/agent/asan/constants.h"
  16    :  
  17    :  #include <windows.h>
  18    :  
  19    :  namespace agent {
  20    :  namespace asan {
  21    :  
  22    :  namespace {
  23    :  
  24    :  size_t page_size = 0;
  25    :  size_t allocation_granularity = 0;
  26    :  
  27  E :  void InitializeConstants() {
  28  E :    if (page_size == 0) {
  29  E :      SYSTEM_INFO system_info = {};
  30  E :      ::GetSystemInfo(&system_info);
  31  E :      page_size = system_info.dwPageSize;
  32  E :      allocation_granularity = system_info.dwAllocationGranularity;
  33    :    }
  34  E :  }
  35    :  
  36    :  }  // namespace
  37    :  
  38  E :  size_t GetPageSize() {
  39  E :    InitializeConstants();
  40  E :    return page_size;
  41  E :  }
  42    :  
  43    :  size_t GetAllocationGranularity() {
  44    :    InitializeConstants();
  45    :    return allocation_granularity;
  46    :  }
  47    :  
  48    :  }  // namespace asan
  49    :  }  // namespace agent