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      1 // Copyright (c) 2012 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 CONTENT_RENDERER_PEPPER_HOST_VAR_TRACKER_H_
      6 #define CONTENT_RENDERER_PEPPER_HOST_VAR_TRACKER_H_
      7 
      8 #include <map>
      9 
     10 #include "base/basictypes.h"
     11 #include "base/compiler_specific.h"
     12 #include "base/containers/hash_tables.h"
     13 #include "base/gtest_prod_util.h"
     14 #include "base/memory/linked_ptr.h"
     15 #include "base/memory/ref_counted.h"
     16 #include "content/common/content_export.h"
     17 #include "ppapi/c/pp_instance.h"
     18 #include "ppapi/shared_impl/host_resource.h"
     19 #include "ppapi/shared_impl/resource_tracker.h"
     20 #include "ppapi/shared_impl/var_tracker.h"
     21 #include "v8/include/v8.h"
     22 
     23 namespace ppapi {
     24 class ArrayBufferVar;
     25 class V8ObjectVar;
     26 class Var;
     27 }
     28 
     29 namespace content {
     30 
     31 class HostVarTracker : public ppapi::VarTracker {
     32  public:
     33   HostVarTracker();
     34   virtual ~HostVarTracker();
     35 
     36   // Tracks all live V8ObjectVar. This is so we can map between instance +
     37   // V8Object and get the V8ObjectVar corresponding to it. This Add/Remove
     38   // function is called by the V8ObjectVar when it is created and destroyed.
     39   void AddV8ObjectVar(ppapi::V8ObjectVar* object_var);
     40   void RemoveV8ObjectVar(ppapi::V8ObjectVar* object_var);
     41   // Creates or retrieves a V8ObjectVar.
     42   PP_Var V8ObjectVarForV8Object(PP_Instance instance,
     43                                 v8::Handle<v8::Object> object);
     44   // Returns the number of V8ObjectVars associated with the given instance.
     45   // Returns 0 if the instance isn't known.
     46   CONTENT_EXPORT int GetLiveV8ObjectVarsForTest(PP_Instance instance);
     47 
     48   // VarTracker public implementation.
     49   virtual PP_Var MakeResourcePPVarFromMessage(
     50       PP_Instance instance,
     51       const IPC::Message& creation_message,
     52       int pending_renderer_id,
     53       int pending_browser_id) OVERRIDE;
     54   virtual ppapi::ResourceVar* MakeResourceVar(PP_Resource pp_resource) OVERRIDE;
     55   virtual void DidDeleteInstance(PP_Instance pp_instance) OVERRIDE;
     56 
     57   virtual int TrackSharedMemoryHandle(PP_Instance instance,
     58                                       base::SharedMemoryHandle file,
     59                                       uint32 size_in_bytes) OVERRIDE;
     60   virtual bool StopTrackingSharedMemoryHandle(int id,
     61                                               PP_Instance instance,
     62                                               base::SharedMemoryHandle* handle,
     63                                               uint32* size_in_bytes) OVERRIDE;
     64 
     65  private:
     66   // VarTracker private implementation.
     67   virtual ppapi::ArrayBufferVar* CreateArrayBuffer(uint32 size_in_bytes)
     68       OVERRIDE;
     69   virtual ppapi::ArrayBufferVar* CreateShmArrayBuffer(
     70       uint32 size_in_bytes,
     71       base::SharedMemoryHandle handle) OVERRIDE;
     72 
     73   // Clear the reference count of the given object and remove it from
     74   // live_vars_.
     75   void ForceReleaseV8Object(ppapi::V8ObjectVar* object_var);
     76 
     77   // A non-unique, ordered key for a V8ObjectVar. Contains the hash of the v8
     78   // and the instance it is associated with.
     79   struct V8ObjectVarKey {
     80     explicit V8ObjectVarKey(ppapi::V8ObjectVar* object_var);
     81     V8ObjectVarKey(PP_Instance i, v8::Handle<v8::Object> object);
     82     ~V8ObjectVarKey();
     83 
     84     bool operator<(const V8ObjectVarKey& other) const;
     85 
     86     PP_Instance instance;
     87     int hash;
     88   };
     89   typedef std::multimap<V8ObjectVarKey, ppapi::V8ObjectVar*> ObjectMap;
     90 
     91   // Returns an iterator into |object_map| which points to V8Object which
     92   // is associated with the given instance and object.
     93   ObjectMap::iterator GetForV8Object(PP_Instance instance,
     94                                      v8::Handle<v8::Object> object);
     95 
     96 
     97   // A multimap of V8ObjectVarKey -> ObjectMap.
     98   ObjectMap object_map_;
     99 
    100   // Tracks all shared memory handles used for transmitting array buffers.
    101   struct SharedMemoryMapEntry {
    102     PP_Instance instance;
    103     base::SharedMemoryHandle handle;
    104     uint32 size_in_bytes;
    105   };
    106   typedef std::map<int, SharedMemoryMapEntry> SharedMemoryMap;
    107   SharedMemoryMap shared_memory_map_;
    108   uint32_t last_shared_memory_map_id_;
    109 
    110   DISALLOW_COPY_AND_ASSIGN(HostVarTracker);
    111 };
    112 
    113 }  // namespace content
    114 
    115 #endif  // CONTENT_RENDERER_PEPPER_HOST_VAR_TRACKER_H_
    116