ppapi/proxy/plugin_resource_tracker.cc

   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