src/content/renderer/pepper/host_var_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 "content/renderer/pepper/host_var_tracker.h"
   6
   7 #include "base/logging.h"
   8 #include "content/renderer/pepper/host_array_buffer_var.h"
   9 #include "content/renderer/pepper/host_globals.h"
  10 #include "content/renderer/pepper/host_resource_var.h"
  11 #include "content/renderer/pepper/pepper_plugin_instance_impl.h"
  12 #include "content/renderer/pepper/v8object_var.h"
  13 #include "ppapi/c/pp_var.h"
  14
  15 using ppapi::ArrayBufferVar;
  16 using ppapi::V8ObjectVar;
  17
  18 namespace content {
  19
  20 HostVarTracker::V8ObjectVarKey::V8ObjectVarKey(V8ObjectVar* object_var)
  21     : instance(object_var->instance()->pp_instance()) {
  22   v8::Local<v8::Object> object = object_var->GetHandle();
  23   hash = object.IsEmpty() ? 0 : object->GetIdentityHash();
  24 }
  25
  26 HostVarTracker::V8ObjectVarKey::V8ObjectVarKey(PP_Instance instance,
  27                                                v8::Handle<v8::Object> object)
  28     : instance(instance),
  29       hash(object.IsEmpty() ? 0 : object->GetIdentityHash()) {}
  30
  31 HostVarTracker::V8ObjectVarKey::~V8ObjectVarKey() {}
  32
  33 bool HostVarTracker::V8ObjectVarKey::operator<(
  34     const V8ObjectVarKey& other) const {
  35   if (instance == other.instance)
  36     return hash < other.hash;
  37   return instance < other.instance;
  38 }
  39
  40 HostVarTracker::HostVarTracker()
  41     : VarTracker(SINGLE_THREADED), last_shared_memory_map_id_(0) {}
  42
  43 HostVarTracker::~HostVarTracker() {}
  44
  45 ArrayBufferVar* HostVarTracker::CreateArrayBuffer(uint32 size_in_bytes) {
  46   return new HostArrayBufferVar(size_in_bytes);
  47 }
  48
  49 ArrayBufferVar* HostVarTracker::CreateShmArrayBuffer(
  50     uint32 size_in_bytes,
  51     base::SharedMemoryHandle handle) {
  52   return new HostArrayBufferVar(size_in_bytes, handle);
  53 }
  54
  55 void HostVarTracker::AddV8ObjectVar(V8ObjectVar* object_var) {
  56   CheckThreadingPreconditions();
  57   v8::HandleScope handle_scope(object_var->instance()->GetIsolate());
  58   DCHECK(GetForV8Object(object_var->instance()->pp_instance(),
  59                         object_var->GetHandle()) == object_map_.end());
  60   object_map_.insert(std::make_pair(V8ObjectVarKey(object_var), object_var));
  61 }
  62
  63 void HostVarTracker::RemoveV8ObjectVar(V8ObjectVar* object_var) {
  64   CheckThreadingPreconditions();
  65   v8::HandleScope handle_scope(object_var->instance()->GetIsolate());
  66   ObjectMap::iterator it = GetForV8Object(
  67       object_var->instance()->pp_instance(), object_var->GetHandle());
  68   DCHECK(it != object_map_.end());
  69   object_map_.erase(it);
  70 }
  71
  72 PP_Var HostVarTracker::V8ObjectVarForV8Object(PP_Instance instance,
  73                                               v8::Handle<v8::Object> object) {
  74   CheckThreadingPreconditions();
  75   ObjectMap::const_iterator it = GetForV8Object(instance, object);
  76   if (it == object_map_.end())
  77     return (new V8ObjectVar(instance, object))->GetPPVar();
  78   return it->second->GetPPVar();
  79 }
  80
  81 int HostVarTracker::GetLiveV8ObjectVarsForTest(PP_Instance instance) {
  82   CheckThreadingPreconditions();
  83   int count = 0;
  84   // Use a key with an empty handle to find the v8 object var in the map with
  85   // the given instance and the lowest hash.
  86   V8ObjectVarKey key(instance, v8::Handle<v8::Object>());
  87   ObjectMap::const_iterator it = object_map_.lower_bound(key);
  88   while (it != object_map_.end() && it->first.instance == instance) {
  89     ++count;
  90     ++it;
  91   }
  92   return count;
  93 }
  94
  95 PP_Var HostVarTracker::MakeResourcePPVarFromMessage(
  96     PP_Instance instance,
  97     const IPC::Message& creation_message,
  98     int pending_renderer_id,
  99     int pending_browser_id) {
 100   // On the host side, the creation message is ignored when creating a resource.
 101   // Therefore, a call to this function indicates a null resource. Return the
 102   // resource 0.
 103   return MakeResourcePPVar(0);
 104 }
 105
 106 ppapi::ResourceVar* HostVarTracker::MakeResourceVar(PP_Resource pp_resource) {
 107   return new HostResourceVar(pp_resource);
 108 }
 109
 110 void HostVarTracker::DidDeleteInstance(PP_Instance pp_instance) {
 111   CheckThreadingPreconditions();
 112
 113   PepperPluginInstanceImpl* instance =
 114       HostGlobals::Get()->GetInstance(pp_instance);
 115   v8::HandleScope handle_scope(instance->GetIsolate());
 116   // Force delete all var references. ForceReleaseV8Object() will cause
 117   // this object, and potentially others it references, to be removed from
 118   // |live_vars_|.
 119
 120   // Use a key with an empty handle to find the v8 object var in the map with
 121   // the given instance and the lowest hash.
 122   V8ObjectVarKey key(pp_instance, v8::Handle<v8::Object>());
 123   ObjectMap::iterator it = object_map_.lower_bound(key);
 124   while (it != object_map_.end() && it->first.instance == pp_instance) {
 125     ForceReleaseV8Object(it->second);
 126     object_map_.erase(it++);
 127   }
 128 }
 129
 130 void HostVarTracker::ForceReleaseV8Object(ppapi::V8ObjectVar* object_var) {
 131   object_var->InstanceDeleted();
 132   VarMap::iterator iter = live_vars_.find(object_var->GetExistingVarID());
 133   if (iter == live_vars_.end()) {
 134     NOTREACHED();
 135     return;
 136   }
 137   iter->second.ref_count = 0;
 138   DCHECK(iter->second.track_with_no_reference_count == 0);
 139   DeleteObjectInfoIfNecessary(iter);
 140 }
 141
 142 HostVarTracker::ObjectMap::iterator HostVarTracker::GetForV8Object(
 143     PP_Instance instance,
 144     v8::Handle<v8::Object> object) {
 145   std::pair<ObjectMap::iterator, ObjectMap::iterator> range =
 146       object_map_.equal_range(V8ObjectVarKey(instance, object));
 147
 148   for (ObjectMap::iterator it = range.first; it != range.second; ++it) {
 149     if (object == it->second->GetHandle())
 150       return it;
 151   }
 152   return object_map_.end();
 153 }
 154
 155 int HostVarTracker::TrackSharedMemoryHandle(PP_Instance instance,
 156                                             base::SharedMemoryHandle handle,
 157                                             uint32 size_in_bytes) {
 158   SharedMemoryMapEntry entry;
 159   entry.instance = instance;
 160   entry.handle = handle;
 161   entry.size_in_bytes = size_in_bytes;
 162
 163   // Find a free id for our map.
 164   while (shared_memory_map_.find(last_shared_memory_map_id_) !=
 165          shared_memory_map_.end()) {
 166     ++last_shared_memory_map_id_;
 167   }
 168   shared_memory_map_[last_shared_memory_map_id_] = entry;
 169   return last_shared_memory_map_id_;
 170 }
 171
 172 bool HostVarTracker::StopTrackingSharedMemoryHandle(
 173     int id,
 174     PP_Instance instance,
 175     base::SharedMemoryHandle* handle,
 176     uint32* size_in_bytes) {
 177   SharedMemoryMap::iterator it = shared_memory_map_.find(id);
 178   if (it == shared_memory_map_.end())
 179     return false;
 180   if (it->second.instance != instance)
 181     return false;
 182
 183   *handle = it->second.handle;
 184   *size_in_bytes = it->second.size_in_bytes;
 185   shared_memory_map_.erase(it);
 186   return true;
 187 }
 188
 189 }  // namespace content