content/renderer/pepper/host_var_tracker.h

   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_