mojo/system/mapping_table.cc

   1 // Copyright 2014 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 "mojo/system/mapping_table.h"
   6
   7 #include "base/logging.h"
   8 #include "mojo/embedder/platform_shared_buffer.h"
   9 #include "mojo/system/constants.h"
  10
  11 namespace mojo {
  12 namespace system {
  13
  14 MappingTable::MappingTable() {
  15 }
  16
  17 MappingTable::~MappingTable() {
  18   // This should usually not be reached (the only instance should be owned by
  19   // the singleton |Core|, which lives forever), except in tests.
  20 }
  21
  22 MojoResult MappingTable::AddMapping(
  23     scoped_ptr<embedder::PlatformSharedBufferMapping> mapping) {
  24   DCHECK(mapping);
  25
  26   if (address_to_mapping_map_.size() >= kMaxMappingTableSize)
  27     return MOJO_RESULT_RESOURCE_EXHAUSTED;
  28
  29   uintptr_t address = reinterpret_cast<uintptr_t>(mapping->GetBase());
  30   DCHECK(address_to_mapping_map_.find(address) ==
  31          address_to_mapping_map_.end());
  32   address_to_mapping_map_[address] = mapping.release();
  33   return MOJO_RESULT_OK;
  34 }
  35
  36 MojoResult MappingTable::RemoveMapping(uintptr_t address) {
  37   AddressToMappingMap::iterator it = address_to_mapping_map_.find(address);
  38   if (it == address_to_mapping_map_.end())
  39     return MOJO_RESULT_INVALID_ARGUMENT;
  40   embedder::PlatformSharedBufferMapping* mapping_to_delete = it->second;
  41   address_to_mapping_map_.erase(it);
  42   delete mapping_to_delete;
  43   return MOJO_RESULT_OK;
  44 }
  45
  46 }  // namespace system
  47 }  // namespace mojo