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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef WEBKIT_PLUGINS_PPAPI_HOST_VAR_TRACKER_H_
#define WEBKIT_PLUGINS_PPAPI_HOST_VAR_TRACKER_H_
#include <map>
#include "base/basictypes.h"
#include "base/compiler_specific.h"
#include "base/containers/hash_tables.h"
#include "base/gtest_prod_util.h"
#include "base/memory/linked_ptr.h"
#include "base/memory/ref_counted.h"
#include "ppapi/c/pp_instance.h"
#include "ppapi/shared_impl/host_resource.h"
#include "ppapi/shared_impl/resource_tracker.h"
#include "ppapi/shared_impl/var_tracker.h"
#include "webkit/plugins/webkit_plugins_export.h"
typedef struct NPObject NPObject;
namespace ppapi {
class ArrayBufferVar;
class NPObjectVar;
class Var;
}
namespace webkit {
namespace ppapi {
// Adds NPObject var tracking to the standard PPAPI VarTracker for use in the
// renderer.
class HostVarTracker : public ::ppapi::VarTracker {
public:
HostVarTracker();
virtual ~HostVarTracker();
// Tracks all live NPObjectVar. This is so we can map between instance +
// NPObject and get the NPObjectVar corresponding to it. This Add/Remove
// function is called by the NPObjectVar when it is created and
// destroyed.
void AddNPObjectVar(::ppapi::NPObjectVar* object_var);
void RemoveNPObjectVar(::ppapi::NPObjectVar* object_var);
// Looks up a previously registered NPObjectVar for the given NPObject and
// instance. Returns NULL if there is no NPObjectVar corresponding to the
// given NPObject for the given instance. See AddNPObjectVar above.
::ppapi::NPObjectVar* NPObjectVarForNPObject(PP_Instance instance,
NPObject* np_object);
// Returns the number of NPObjectVar's associated with the given instance.
// Returns 0 if the instance isn't known.
WEBKIT_PLUGINS_EXPORT int GetLiveNPObjectVarsForInstance(
PP_Instance instance) const;
// VarTracker public implementation.
virtual void DidDeleteInstance(PP_Instance instance) OVERRIDE;
virtual int TrackSharedMemoryHandle(PP_Instance instance,
base::SharedMemoryHandle file,
uint32 size_in_bytes) OVERRIDE;
virtual bool StopTrackingSharedMemoryHandle(int id,
PP_Instance instance,
base::SharedMemoryHandle* handle,
uint32* size_in_bytes) OVERRIDE;
private:
// VarTracker private implementation.
virtual ::ppapi::ArrayBufferVar* CreateArrayBuffer(
uint32 size_in_bytes) OVERRIDE;
virtual ::ppapi::ArrayBufferVar* CreateShmArrayBuffer(
uint32 size_in_bytes, base::SharedMemoryHandle handle) OVERRIDE;
// Clear the reference count of the given object and remove it from
// live_vars_.
void ForceReleaseNPObject(::ppapi::NPObjectVar* object_var);
typedef std::map<NPObject*, ::ppapi::NPObjectVar*>
NPObjectToNPObjectVarMap;
// Lists all known NPObjects, first indexed by the corresponding instance,
// then by the NPObject*. This allows us to look up an NPObjectVar given
// these two pieces of information.
//
// The instance map is lazily managed, so we'll add the
// NPObjectToNPObjectVarMap lazily when the first NPObject var is created,
// and delete it when it's empty.
typedef std::map<PP_Instance, linked_ptr<NPObjectToNPObjectVarMap> >
InstanceMap;
InstanceMap instance_map_;
// Tracks all shared memory handles used for transmitting array buffers.
struct SharedMemoryMapEntry {
PP_Instance instance;
base::SharedMemoryHandle handle;
uint32 size_in_bytes;
};
typedef std::map<int, SharedMemoryMapEntry> SharedMemoryMap;
SharedMemoryMap shared_memory_map_;
uint32_t last_shared_memory_map_id_;
DISALLOW_COPY_AND_ASSIGN(HostVarTracker);
};
} // namespace ppapi
} // namespace webkit
#endif // WEBKIT_PLUGINS_PPAPI_HOST_VAR_TRACKER_H_
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