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// Copyright (c) 2011 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 "ppapi/shared_impl/resource_tracker.h"
#include "ppapi/shared_impl/callback_tracker.h"
#include "ppapi/shared_impl/id_assignment.h"
#include "ppapi/shared_impl/ppapi_globals.h"
#include "ppapi/shared_impl/resource.h"
namespace ppapi {
ResourceTracker::ResourceTracker() : last_resource_value_(0) {
}
ResourceTracker::~ResourceTracker() {
}
Resource* ResourceTracker::GetResource(PP_Resource res) const {
ResourceMap::const_iterator i = live_resources_.find(res);
if (i == live_resources_.end())
return NULL;
return i->second.first;
}
void ResourceTracker::AddRefResource(PP_Resource res) {
DLOG_IF(ERROR, !CheckIdType(res, PP_ID_TYPE_RESOURCE))
<< res << " is not a PP_Resource.";
ResourceMap::iterator i = live_resources_.find(res);
if (i == live_resources_.end())
return;
// Prevent overflow of refcount.
if (i->second.second ==
std::numeric_limits<ResourceAndRefCount::second_type>::max())
return;
// When we go from 0 to 1 plugin ref count, keep an additional "real" ref
// on its behalf.
if (i->second.second == 0)
i->second.first->AddRef();
i->second.second++;
return;
}
void ResourceTracker::ReleaseResource(PP_Resource res) {
DLOG_IF(ERROR, !CheckIdType(res, PP_ID_TYPE_RESOURCE))
<< res << " is not a PP_Resource.";
ResourceMap::iterator i = live_resources_.find(res);
if (i == live_resources_.end())
return;
// Prevent underflow of refcount.
if (i->second.second == 0)
return;
i->second.second--;
if (i->second.second == 0) {
LastPluginRefWasDeleted(i->second.first);
// When we go from 1 to 0 plugin ref count, free the additional "real" ref
// on its behalf. THIS WILL MOST LIKELY RELEASE THE OBJECT AND REMOVE IT
// FROM OUR LIST.
i->second.first->Release();
}
}
void ResourceTracker::DidCreateInstance(PP_Instance instance) {
// Due to the infrastructure of some tests, the instance is registered
// twice in a few cases. It would be nice not to do that and assert here
// instead.
if (instance_map_.find(instance) != instance_map_.end())
return;
instance_map_[instance] = linked_ptr<InstanceData>(new InstanceData);
}
void ResourceTracker::DidDeleteInstance(PP_Instance instance) {
InstanceMap::iterator found_instance = instance_map_.find(instance);
// Due to the infrastructure of some tests, the instance is uyregistered
// twice in a few cases. It would be nice not to do that and assert here
// instead.
if (found_instance == instance_map_.end())
return;
InstanceData& data = *found_instance->second;
// Force release all plugin references to resources associated with the
// deleted instance. Make a copy since as we iterate through them, each one
// will remove itself from the tracking info individually.
ResourceSet to_delete = data.resources;
ResourceSet::iterator cur = to_delete.begin();
while (cur != to_delete.end()) {
// Note that it's remotely possible for the object to already be deleted
// from the live resources. One case is if a resource object is holding
// the last ref to another. When we release the first one, it will release
// the second one. So the second one will be gone when we eventually get
// to it.
ResourceMap::iterator found_resource = live_resources_.find(*cur);
if (found_resource != live_resources_.end()) {
Resource* resource = found_resource->second.first;
if (found_resource->second.second > 0) {
LastPluginRefWasDeleted(resource);
found_resource->second.second = 0;
// This will most likely delete the resource object and remove it
// from the live_resources_ list.
resource->Release();
}
}
cur++;
}
// In general the above pass will delete all the resources and there won't
// be any left in the map. However, if parts of the implementation are still
// holding on to internal refs, we need to tell them that the instance is
// gone.
to_delete = data.resources;
cur = to_delete.begin();
while (cur != to_delete.end()) {
ResourceMap::iterator found_resource = live_resources_.find(*cur);
if (found_resource != live_resources_.end())
found_resource->second.first->InstanceWasDeleted();
cur++;
}
instance_map_.erase(instance);
}
int ResourceTracker::GetLiveObjectsForInstance(PP_Instance instance) const {
InstanceMap::const_iterator found = instance_map_.find(instance);
if (found == instance_map_.end())
return 0;
return static_cast<int>(found->second->resources.size());
}
PP_Resource ResourceTracker::AddResource(Resource* object) {
// If the plugin manages to create too many resources, don't do crazy stuff.
if (last_resource_value_ == kMaxPPId)
return 0;
InstanceMap::iterator found = instance_map_.find(object->pp_instance());
if (found == instance_map_.end()) {
// If you hit this, it's likely somebody forgot to call DidCreateInstance,
// the resource was created with an invalid PP_Instance, or the renderer
// side tried to create a resource for a plugin that crashed/exited. This
// could happen for OOP plugins where due to reentrancies in context of
// outgoing sync calls the renderer can send events after a plugin has
// exited.
DLOG(INFO) << "Failed to find plugin instance in instance map";
return 0;
}
PP_Resource new_id = MakeTypedId(++last_resource_value_, PP_ID_TYPE_RESOURCE);
found->second->resources.insert(new_id);
live_resources_[new_id] = ResourceAndRefCount(object, 0);
return new_id;
}
void ResourceTracker::RemoveResource(Resource* object) {
PP_Resource pp_resource = object->pp_resource();
InstanceMap::iterator found = instance_map_.find(object->pp_instance());
if (found != instance_map_.end())
found->second->resources.erase(pp_resource);
live_resources_.erase(pp_resource);
}
void ResourceTracker::LastPluginRefWasDeleted(Resource* object) {
PpapiGlobals::Get()->GetCallbackTrackerForInstance(object->pp_instance())->
PostAbortForResource(object->pp_resource());
object->LastPluginRefWasDeleted();
}
} // namespace ppapi
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