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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "webkit/plugins/ppapi/host_var_tracker.h"
#include "base/logging.h"
#include "ppapi/c/pp_var.h"
#include "webkit/plugins/ppapi/host_array_buffer_var.h"
#include "webkit/plugins/ppapi/npobject_var.h"
#include "webkit/plugins/ppapi/ppapi_plugin_instance.h"
using ppapi::ArrayBufferVar;
using ppapi::NPObjectVar;
namespace webkit {
namespace ppapi {
HostVarTracker::HostVarTracker() {
}
HostVarTracker::~HostVarTracker() {
}
ArrayBufferVar* HostVarTracker::CreateArrayBuffer(uint32 size_in_bytes) {
return new HostArrayBufferVar(size_in_bytes);
}
void HostVarTracker::AddNPObjectVar(NPObjectVar* object_var) {
DCHECK(CalledOnValidThread());
InstanceMap::iterator found_instance = instance_map_.find(
object_var->pp_instance());
if (found_instance == instance_map_.end()) {
// Lazily create the instance map.
DCHECK(object_var->pp_instance() != 0);
found_instance = instance_map_.insert(std::make_pair(
object_var->pp_instance(),
linked_ptr<NPObjectToNPObjectVarMap>(new NPObjectToNPObjectVarMap))).
first;
}
NPObjectToNPObjectVarMap* np_object_map = found_instance->second.get();
DCHECK(np_object_map->find(object_var->np_object()) ==
np_object_map->end()) << "NPObjectVar already in map";
np_object_map->insert(
std::make_pair(object_var->np_object(), object_var->AsWeakPtr()));
}
void HostVarTracker::RemoveNPObjectVar(NPObjectVar* object_var) {
DCHECK(CalledOnValidThread());
InstanceMap::iterator found_instance = instance_map_.find(
object_var->pp_instance());
if (found_instance == instance_map_.end()) {
NOTREACHED() << "NPObjectVar has invalid instance.";
return;
}
NPObjectToNPObjectVarMap* np_object_map = found_instance->second.get();
NPObjectToNPObjectVarMap::iterator found_object =
np_object_map->find(object_var->np_object());
if (found_object == np_object_map->end()) {
NOTREACHED() << "NPObjectVar not registered.";
return;
}
if (found_object->second != object_var) {
NOTREACHED() << "NPObjectVar doesn't match.";
return;
}
np_object_map->erase(found_object);
// Clean up when the map is empty.
if (np_object_map->empty())
instance_map_.erase(found_instance);
}
NPObjectVar* HostVarTracker::NPObjectVarForNPObject(PP_Instance instance,
NPObject* np_object) {
DCHECK(CalledOnValidThread());
InstanceMap::iterator found_instance = instance_map_.find(instance);
if (found_instance == instance_map_.end())
return NULL; // No such instance.
NPObjectToNPObjectVarMap* np_object_map = found_instance->second.get();
NPObjectToNPObjectVarMap::iterator found_object =
np_object_map->find(np_object);
if (found_object == np_object_map->end())
return NULL; // No such object.
return found_object->second;
}
int HostVarTracker::GetLiveNPObjectVarsForInstance(PP_Instance instance) const {
DCHECK(CalledOnValidThread());
InstanceMap::const_iterator found = instance_map_.find(instance);
if (found == instance_map_.end())
return 0;
return static_cast<int>(found->second->size());
}
void HostVarTracker::DidDeleteInstance(PP_Instance instance) {
DCHECK(CalledOnValidThread());
InstanceMap::iterator found_instance = instance_map_.find(instance);
if (found_instance == instance_map_.end())
return; // Nothing to do.
NPObjectToNPObjectVarMap* np_object_map = found_instance->second.get();
// Force delete all var references. It's possible that deleting an object "A"
// will cause it to delete another object "B" it references, thus removing "B"
// from instance_map_. Therefore, we need to make a copy over which we can
// iterate safely. Furthermore, the maps contain WeakPtrs so that we can
// detect if the object is gone so that we don't dereference invalid memory.
NPObjectToNPObjectVarMap np_object_map_copy = *np_object_map;
NPObjectToNPObjectVarMap::iterator cur_var =
np_object_map_copy.begin();
while (cur_var != np_object_map_copy.end()) {
NPObjectToNPObjectVarMap::iterator current = cur_var++;
ForceReleaseNPObject(current->second);
np_object_map->erase(current->first);
}
// Remove the record for this instance since it should be empty.
DCHECK(np_object_map->empty());
instance_map_.erase(found_instance);
}
void HostVarTracker::ForceReleaseNPObject(
const base::WeakPtr< ::ppapi::NPObjectVar>& object) {
// There's a chance that the object was already deleted before we got here.
// See DidDeleteInstance for further explanation. If the object was deleted,
// the WeakPtr will return NULL.
if (!object.get())
return;
object->InstanceDeleted();
VarMap::iterator iter = live_vars_.find(object->GetExistingVarID());
if (iter == live_vars_.end()) {
NOTREACHED();
return;
}
iter->second.ref_count = 0;
DCHECK(iter->second.track_with_no_reference_count == 0);
DeleteObjectInfoIfNecessary(iter);
}
} // namespace ppapi
} // namespace webkit
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