Add a unified resource tracker shared between the proxy and the impl.

ppapi/shared_impl/resource_tracker.cc

+// 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/id_assignment.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) {
+    i->second.first->LastPluginRefWasDeleted();
+
+    // When we go from 0 to 1 plugin ref count, free the additional "real" ref

[dmichael (off chromium), 2011/08/17 21:35:51]

0 to 1 -> 1 to 0

+    // on its behalf. THIS WILL MOST LIKELY RELEASE THE OBJECT AND REMOVE IT
+    // FROM OUR LIST.
+    i->second.first->Release();
+  }
+  return;

[dmichael (off chromium), 2011/08/17 21:35:51]

nit: the last return is unnecessary here and in AddRefResource

+}
+
+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

[dmichael (off chromium), 2011/08/17 21:35:51]

uyregistered->unregistered

+  // 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) {
+        resource->LastPluginRefWasDeleted();
+        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;
+
+  // If you hit this somebody forgot to call DidCreateInstance or the resource
+  // was created with an invalid PP_Instance.
+  DCHECK(instance_map_.find(object->pp_instance()) != instance_map_.end());
+
+  PP_Resource new_id = MakeTypedId(++last_resource_value_, PP_ID_TYPE_RESOURCE);
+  instance_map_[object->pp_instance()]->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();
+  if (object->pp_instance())
+    instance_map_[object->pp_instance()]->resources.erase(pp_resource);
+  live_resources_.erase(pp_resource);
+}
+
+
+}  // namespace ppapi