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      1 // Copyright 2014 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_V8OBJECT_VAR_H_
      6 #define CONTENT_RENDERER_PEPPER_V8OBJECT_VAR_H_
      7 
      8 #include <string>
      9 
     10 #include "base/compiler_specific.h"
     11 #include "content/common/content_export.h"
     12 #include "ppapi/c/pp_instance.h"
     13 #include "ppapi/shared_impl/var.h"
     14 #include "v8/include/v8.h"
     15 
     16 namespace content {
     17 class PepperPluginInstanceImpl;
     18 }  // namespace content
     19 
     20 namespace ppapi {
     21 
     22 // V8ObjectVar -----------------------------------------------------------------
     23 
     24 // Represents a JavaScript object Var. By itself, this represents random
     25 // v8 objects that a given plugin (identified by the resource's module) wants to
     26 // reference. If two different modules reference the same v8 object (like the
     27 // "window" object), then there will be different V8ObjectVar's (and hence
     28 // PP_Var IDs) for each module. This allows us to track all references owned by
     29 // a given module and free them when the plugin exits independently of other
     30 // plugins that may be running at the same time.
     31 class CONTENT_EXPORT V8ObjectVar : public Var {
     32  public:
     33   V8ObjectVar(PP_Instance instance, v8::Handle<v8::Object> v8_object);
     34 
     35   // Var overrides.
     36   virtual V8ObjectVar* AsV8ObjectVar() OVERRIDE;
     37   virtual PP_VarType GetType() const OVERRIDE;
     38 
     39   // Returns the underlying v8 object corresponding to this V8ObjectVar. This
     40   // should only be used on the stack.
     41   v8::Local<v8::Object> GetHandle() const;
     42 
     43   // Notification that the instance was deleted, the internal reference will be
     44   // zeroed out.
     45   void InstanceDeleted();
     46 
     47   // Possibly NULL if the object has outlived its instance.
     48   content::PepperPluginInstanceImpl* instance() const { return instance_; }
     49 
     50   // Helper function that converts a PP_Var to an object. This will return NULL
     51   // if the PP_Var is not of object type or the object is invalid.
     52   static scoped_refptr<V8ObjectVar> FromPPVar(PP_Var var);
     53 
     54  private:
     55   virtual ~V8ObjectVar();
     56 
     57   content::PepperPluginInstanceImpl* instance_;
     58 
     59   v8::Persistent<v8::Object> v8_object_;
     60 
     61   DISALLOW_COPY_AND_ASSIGN(V8ObjectVar);
     62 };
     63 
     64 }  // ppapi
     65 
     66 #endif  // CONTENT_RENDERER_PEPPER_V8OBJECT_VAR_H_
     67