mapping_table.cc revision 5f1c94371a64b3196d4be9466099bb892df9b88e 
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/system/constants.h"
9#include "mojo/system/raw_shared_buffer.h"
10
11namespace mojo {
12namespace system {
13
14MappingTable::MappingTable() {
15}
16
17MappingTable::~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
22MojoResult MappingTable::AddMapping(
23    scoped_ptr<RawSharedBufferMapping> 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->base());
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
36MojoResult 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  RawSharedBufferMapping* 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
48