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      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 #ifndef MOJO_EDK_SYSTEM_MAPPING_TABLE_H_
      6 #define MOJO_EDK_SYSTEM_MAPPING_TABLE_H_
      7 
      8 #include <stdint.h>
      9 
     10 #include <memory>
     11 #include <vector>
     12 
     13 #include "base/containers/hash_tables.h"
     14 #include "base/macros.h"
     15 #include "mojo/edk/system/system_impl_export.h"
     16 #include "mojo/public/c/system/types.h"
     17 
     18 namespace mojo {
     19 
     20 namespace edk {
     21 class Core;
     22 class PlatformSharedBufferMapping;
     23 
     24 // Test-only function (defined/used in embedder/test_embedder.cc). Declared here
     25 // so it can be friended.
     26 namespace internal {
     27 bool ShutdownCheckNoLeaks(Core*);
     28 }
     29 
     30 // This class provides the (global) table of memory mappings (owned by |Core|),
     31 // which maps mapping base addresses to |PlatformSharedBufferMapping|s.
     32 //
     33 // This class is NOT thread-safe; locking is left to |Core|.
     34 class MOJO_SYSTEM_IMPL_EXPORT MappingTable {
     35  public:
     36   MappingTable();
     37   ~MappingTable();
     38 
     39   // Tries to add a mapping. (Takes ownership of the mapping in all cases; on
     40   // failure, it will be destroyed.)
     41   MojoResult AddMapping(std::unique_ptr<PlatformSharedBufferMapping> mapping);
     42   MojoResult RemoveMapping(void* address);
     43 
     44  private:
     45   friend bool internal::ShutdownCheckNoLeaks(Core*);
     46 
     47   using AddressToMappingMap =
     48       base::hash_map<void*, PlatformSharedBufferMapping*>;
     49   AddressToMappingMap address_to_mapping_map_;
     50 
     51   DISALLOW_COPY_AND_ASSIGN(MappingTable);
     52 };
     53 
     54 }  // namespace edk
     55 }  // namespace mojo
     56 
     57 #endif  // MOJO_EDK_SYSTEM_MAPPING_TABLE_H_
     58