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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 #include "ppapi/proxy/plugin_resource_tracker.h"
      6 
      7 #include "base/logging.h"
      8 #include "base/memory/singleton.h"
      9 #include "ppapi/proxy/plugin_dispatcher.h"
     10 #include "ppapi/proxy/plugin_globals.h"
     11 #include "ppapi/proxy/ppapi_messages.h"
     12 #include "ppapi/proxy/serialized_var.h"
     13 #include "ppapi/shared_impl/proxy_lock.h"
     14 #include "ppapi/shared_impl/resource.h"
     15 #include "ppapi/shared_impl/var.h"
     16 
     17 namespace ppapi {
     18 namespace proxy {
     19 
     20 PluginResourceTracker::PluginResourceTracker() : ResourceTracker(THREAD_SAFE) {
     21   UseOddResourceValueInDebugMode();
     22 }
     23 
     24 PluginResourceTracker::~PluginResourceTracker() {
     25 }
     26 
     27 PP_Resource PluginResourceTracker::PluginResourceForHostResource(
     28     const HostResource& resource) const {
     29   HostResourceMap::const_iterator found = host_resource_map_.find(resource);
     30   if (found == host_resource_map_.end())
     31     return 0;
     32   return found->second;
     33 }
     34 
     35 PP_Resource PluginResourceTracker::AddResource(Resource* object) {
     36   // If there's a HostResource, it must not be added twice.
     37   DCHECK(!object->host_resource().host_resource() ||
     38          (host_resource_map_.find(object->host_resource()) ==
     39           host_resource_map_.end()));
     40 
     41   PP_Resource ret = ResourceTracker::AddResource(object);
     42 
     43   // Some resources are plugin-only, so they don't have a host resource.
     44   if (object->host_resource().host_resource())
     45     host_resource_map_.insert(std::make_pair(object->host_resource(), ret));
     46   return ret;
     47 }
     48 
     49 void PluginResourceTracker::RemoveResource(Resource* object) {
     50   ResourceTracker::RemoveResource(object);
     51 
     52   if (!object->host_resource().is_null()) {
     53     // The host_resource will be NULL for proxy-only resources, which we
     54     // obviously don't need to tell the host about.
     55     DCHECK(host_resource_map_.find(object->host_resource()) !=
     56            host_resource_map_.end());
     57     host_resource_map_.erase(object->host_resource());
     58 
     59     PluginDispatcher* dispatcher =
     60         PluginDispatcher::GetForInstance(object->pp_instance());
     61     if (dispatcher) {
     62       // The dispatcher can be NULL if the plugin held on to a resource after
     63       // the instance was destroyed. In that case the browser-side resource has
     64       // already been freed correctly on the browser side.
     65       dispatcher->Send(new PpapiHostMsg_PPBCore_ReleaseResource(
     66           API_ID_PPB_CORE, object->host_resource()));
     67     }
     68   }
     69 }
     70 
     71 }  // namespace proxy
     72 }  // namespace ppapi
     73