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      1 // Copyright 2013 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #include "base/memory/discardable_memory.h"
      6 
      7 #include "base/logging.h"
      8 #include "base/memory/discardable_memory_emulated.h"
      9 #include "base/memory/discardable_memory_malloc.h"
     10 
     11 namespace base {
     12 
     13 // static
     14 bool DiscardableMemory::ReduceMemoryUsage() {
     15   return internal::DiscardableMemoryEmulated::ReduceMemoryUsage();
     16 }
     17 
     18 // static
     19 void DiscardableMemory::GetSupportedTypes(
     20     std::vector<DiscardableMemoryType>* types) {
     21   const DiscardableMemoryType supported_types[] = {
     22     DISCARDABLE_MEMORY_TYPE_EMULATED,
     23     DISCARDABLE_MEMORY_TYPE_MALLOC
     24   };
     25   types->assign(supported_types, supported_types + arraysize(supported_types));
     26 }
     27 
     28 // static
     29 scoped_ptr<DiscardableMemory> DiscardableMemory::CreateLockedMemoryWithType(
     30     DiscardableMemoryType type, size_t size) {
     31   switch (type) {
     32     case DISCARDABLE_MEMORY_TYPE_NONE:
     33     case DISCARDABLE_MEMORY_TYPE_ASHMEM:
     34     case DISCARDABLE_MEMORY_TYPE_MAC:
     35       return scoped_ptr<DiscardableMemory>();
     36     case DISCARDABLE_MEMORY_TYPE_EMULATED: {
     37       scoped_ptr<internal::DiscardableMemoryEmulated> memory(
     38           new internal::DiscardableMemoryEmulated(size));
     39       if (!memory->Initialize())
     40         return scoped_ptr<DiscardableMemory>();
     41 
     42       return memory.PassAs<DiscardableMemory>();
     43     }
     44     case DISCARDABLE_MEMORY_TYPE_MALLOC: {
     45       scoped_ptr<internal::DiscardableMemoryMalloc> memory(
     46           new internal::DiscardableMemoryMalloc(size));
     47       if (!memory->Initialize())
     48         return scoped_ptr<DiscardableMemory>();
     49 
     50       return memory.PassAs<DiscardableMemory>();
     51     }
     52   }
     53 
     54   NOTREACHED();
     55   return scoped_ptr<DiscardableMemory>();
     56 }
     57 
     58 // static
     59 void DiscardableMemory::PurgeForTesting() {
     60   internal::DiscardableMemoryEmulated::PurgeForTesting();
     61 }
     62 
     63 }  // namespace base
     64