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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 CONTENT_RENDERER_PEPPER_HOST_VAR_TRACKER_H_
#define CONTENT_RENDERER_PEPPER_HOST_VAR_TRACKER_H_
#include <stdint.h>
#include <map>
#include "base/compiler_specific.h"
#include "base/containers/hash_tables.h"
#include "base/macros.h"
#include "base/memory/ref_counted.h"
#include "content/common/content_export.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 "v8/include/v8.h"
namespace ppapi {
class ArrayBufferVar;
class V8ObjectVar;
}
namespace content {
class HostVarTracker : public ppapi::VarTracker {
public:
HostVarTracker();
~HostVarTracker() override;
// Tracks all live V8ObjectVar. This is so we can map between instance +
// V8Object and get the V8ObjectVar corresponding to it. This Add/Remove
// function is called by the V8ObjectVar when it is created and destroyed.
void AddV8ObjectVar(ppapi::V8ObjectVar* object_var);
void RemoveV8ObjectVar(ppapi::V8ObjectVar* object_var);
// Creates or retrieves a V8ObjectVar.
PP_Var V8ObjectVarForV8Object(PP_Instance instance,
v8::Local<v8::Object> object);
// Returns the number of V8ObjectVars associated with the given instance.
// Returns 0 if the instance isn't known.
CONTENT_EXPORT int GetLiveV8ObjectVarsForTest(PP_Instance instance);
// VarTracker public implementation.
PP_Var MakeResourcePPVarFromMessage(PP_Instance instance,
const IPC::Message& creation_message,
int pending_renderer_id,
int pending_browser_id) override;
ppapi::ResourceVar* MakeResourceVar(PP_Resource pp_resource) override;
void DidDeleteInstance(PP_Instance pp_instance) override;
int TrackSharedMemoryHandle(PP_Instance instance,
base::SharedMemoryHandle file,
uint32_t size_in_bytes) override;
bool StopTrackingSharedMemoryHandle(int id,
PP_Instance instance,
base::SharedMemoryHandle* handle,
uint32_t* size_in_bytes) override;
private:
// VarTracker private implementation.
ppapi::ArrayBufferVar* CreateArrayBuffer(uint32_t size_in_bytes) override;
ppapi::ArrayBufferVar* CreateShmArrayBuffer(
uint32_t size_in_bytes,
base::SharedMemoryHandle handle) override;
// Clear the reference count of the given object and remove it from
// live_vars_.
void ForceReleaseV8Object(ppapi::V8ObjectVar* object_var);
// A non-unique, ordered key for a V8ObjectVar. Contains the hash of the v8
// and the instance it is associated with.
struct V8ObjectVarKey {
explicit V8ObjectVarKey(ppapi::V8ObjectVar* object_var);
V8ObjectVarKey(PP_Instance i, v8::Local<v8::Object> object);
~V8ObjectVarKey();
bool operator<(const V8ObjectVarKey& other) const;
PP_Instance instance;
int hash;
};
typedef std::multimap<V8ObjectVarKey, ppapi::V8ObjectVar*> ObjectMap;
// Returns an iterator into |object_map| which points to V8Object which
// is associated with the given instance and object.
ObjectMap::iterator GetForV8Object(PP_Instance instance,
v8::Local<v8::Object> object);
// A multimap of V8ObjectVarKey -> ObjectMap.
ObjectMap object_map_;
// Tracks all shared memory handles used for transmitting array buffers.
struct SharedMemoryMapEntry {
PP_Instance instance;
base::SharedMemoryHandle handle;
uint32_t 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 content
#endif // CONTENT_RENDERER_PEPPER_HOST_VAR_TRACKER_H_
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