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// Copyright (c) 2010 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/glue/plugins/pepper_resource_tracker.h"
#include <limits>
#include <set>
#include "base/logging.h"
#include "base/rand_util.h"
#include "third_party/ppapi/c/pp_resource.h"
#include "webkit/glue/plugins/pepper_resource.h"
namespace pepper {
scoped_refptr<Resource> ResourceTracker::GetResource(PP_Resource res) const {
ResourceMap::const_iterator result = live_resources_.find(res);
if (result == live_resources_.end()) {
return scoped_refptr<Resource>();
}
return result->second.first;
}
ResourceTracker::ResourceTracker()
: last_id_(0) {
}
ResourceTracker::~ResourceTracker() {
}
PP_Resource ResourceTracker::AddResource(Resource* resource) {
// If the plugin manages to create 4B resources...
if (last_id_ == std::numeric_limits<PP_Resource>::max()) {
return 0;
}
// Add the resource with plugin use-count 1.
++last_id_;
live_resources_.insert(std::make_pair(last_id_, std::make_pair(resource, 1)));
return last_id_;
}
bool ResourceTracker::AddRefResource(PP_Resource res) {
ResourceMap::iterator i = live_resources_.find(res);
if (i != live_resources_.end()) {
// We don't protect against overflow, since a plugin as malicious as to ref
// once per every byte in the address space could have just as well unrefed
// one time too many.
++i->second.second;
return true;
} else {
return false;
}
}
bool ResourceTracker::UnrefResource(PP_Resource res) {
ResourceMap::iterator i = live_resources_.find(res);
if (i != live_resources_.end()) {
if (!--i->second.second) {
i->second.first->StoppedTracking();
live_resources_.erase(i);
}
return true;
} else {
return false;
}
}
uint32 ResourceTracker::GetLiveObjectsForModule(PluginModule* module) const {
// Since this is for testing only, we'll just go through all of them and
// count.
//
// TODO(brettw) we will eventually need to implement more efficient
// module->resource lookup to free resources when a module is unloaded. In
// this case, this function can be implemented using that system.
uint32 count = 0;
for (ResourceMap::const_iterator i = live_resources_.begin();
i != live_resources_.end(); ++i)
count++;
return count;
}
PP_Instance ResourceTracker::AddInstance(PluginInstance* instance) {
#ifndef NDEBUG
// Make sure we're not adding one more than once.
for (InstanceMap::const_iterator i = instance_map_.begin();
i != instance_map_.end(); ++i)
DCHECK(i->second != instance);
#endif
// Use a random 64-bit number for the instance ID. This helps prevent some
// mischeif where you could misallocate resources if you gave a different
// instance ID.
//
// See also AddModule below.
//
// Need to make sure the random number isn't a duplicate or 0.
PP_Instance new_instance;
do {
new_instance = static_cast<PP_Instance>(base::RandUint64());
} while (!new_instance ||
instance_map_.find(new_instance) != instance_map_.end());
instance_map_[new_instance] = instance;
return new_instance;
}
void ResourceTracker::InstanceDeleted(PP_Instance instance) {
InstanceMap::iterator found = instance_map_.find(instance);
if (found == instance_map_.end()) {
NOTREACHED();
return;
}
instance_map_.erase(found);
}
PluginInstance* ResourceTracker::GetInstance(PP_Instance instance) {
InstanceMap::iterator found = instance_map_.find(instance);
if (found == instance_map_.end())
return NULL;
return found->second;
}
PP_Module ResourceTracker::AddModule(PluginModule* module) {
#ifndef NDEBUG
// Make sure we're not adding one more than once.
for (ModuleMap::const_iterator i = module_map_.begin();
i != module_map_.end(); ++i)
DCHECK(i->second != module);
#endif
// See AddInstance above.
PP_Module new_module;
do {
new_module = static_cast<PP_Module>(base::RandUint64());
} while (!new_module ||
module_map_.find(new_module) != module_map_.end());
module_map_[new_module] = module;
return new_module;
}
void ResourceTracker::ModuleDeleted(PP_Module module) {
ModuleMap::iterator found = module_map_.find(module);
if (found == module_map_.end()) {
NOTREACHED();
return;
}
module_map_.erase(found);
}
PluginModule* ResourceTracker::GetModule(PP_Module module) {
ModuleMap::iterator found = module_map_.find(module);
if (found == module_map_.end())
return NULL;
return found->second;
}
} // namespace pepper
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