chromium/ppapi/shared_impl/var_tracker.h

// Copyright 2012 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef PPAPI_SHARED_IMPL_VAR_TRACKER_H_
#define PPAPI_SHARED_IMPL_VAR_TRACKER_H_

#include <stdint.h>

#include <memory>
#include <unordered_map>
#include <vector>

#include "base/memory/ref_counted.h"
#include "base/memory/unsafe_shared_memory_region.h"
#include "base/threading/thread_checker.h"
#include "ppapi/c/pp_instance.h"
#include "ppapi/c/pp_module.h"
#include "ppapi/c/pp_resource.h"
#include "ppapi/c/pp_var.h"
#include "ppapi/shared_impl/host_resource.h"
#include "ppapi/shared_impl/ppapi_shared_export.h"
#include "ppapi/shared_impl/var.h"

namespace IPC {
class Message;
}  // namespace IPC

namespace ppapi {

class ArrayBufferVar;

// Tracks non-POD (refcounted) var objects held by a plugin.
//
// The tricky part is the concept of a "tracked object". These are only
// necessary in the plugin side of the proxy when running out of process. A
// tracked object is one that the plugin is aware of, but doesn't hold a
// reference to. This will happen when the plugin is passed an object as an
// argument from the host (renderer) as an input argument to a sync function,
// but where ownership is not passed.
//
// This class maintains the "track_with_no_reference_count" but doesn't do
// anything with it other than call virtual functions. The interesting parts
// are added by the PluginObjectVar derived from this class.
class PPAPI_SHARED_EXPORT VarTracker { … };

}  // namespace ppapi

#endif  // PPAPI_SHARED_IMPL_VAR_TRACKER_H_