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// Copyright 2016 Google Inc. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include "cobalt/script/mozjs-45/weak_heap_object_manager.h"
#include <utility>
#include "base/logging.h"
#include "cobalt/script/mozjs-45/weak_heap_object.h"
#include "nb/memory_scope.h"
#include "starboard/system.h"
#include "third_party/mozjs-45/js/src/jsapi.h"
namespace cobalt {
namespace script {
namespace mozjs {
void WeakHeapObjectManager::SweepUnmarkedObjects() {
for (WeakHeapObjects::iterator it = weak_objects_.begin();
it != weak_objects_.end();
/* Incremented in the loop */) {
if (MaybeSweep(*it)) {
WeakHeapObjects::iterator erase_iterator = it++;
weak_objects_.erase(erase_iterator);
} else {
++it;
}
}
}
WeakHeapObjectManager::~WeakHeapObjectManager() {
// If this is not empty, that means that some WeakHeapObject may outlive
// this class.
#if COBALT_TRACK_WEAK_HEAP_OBJECT_ADDED_FROM_LOCATION
for (const auto& object : weak_objects_) {
LOG(INFO) << static_cast<void*>(object);
for (const auto& location : added_from_[object]) {
LOG(INFO) << " " << location;
}
}
#endif
DCHECK(weak_objects_.empty());
}
void WeakHeapObjectManager::StartTracking(WeakHeapObject* weak_object) {
TRACK_MEMORY_SCOPE("Javascript");
std::pair<WeakHeapObjects::iterator, bool> pib =
weak_objects_.insert(weak_object);
DCHECK(pib.second) << "WeakHeapObject was already being tracked.";
#if COBALT_TRACK_WEAK_HEAP_OBJECT_ADDED_FROM_LOCATION
const int kRequestedStackSize = 100;
void* stack[kRequestedStackSize];
int stack_size = SbSystemGetStack(stack, kRequestedStackSize);
added_from_[weak_object].assign(stack, stack + stack_size);
#endif
}
void WeakHeapObjectManager::StopTracking(WeakHeapObject* weak_object) {
// The WeakHeapObject may have already been removed from the weak_objects_
// set during the sweep phase.
WeakHeapObjects::iterator it = weak_objects_.find(weak_object);
if (it != weak_objects_.end()) {
weak_objects_.erase(it);
}
}
bool WeakHeapObjectManager::MaybeSweep(WeakHeapObject* weak_object) {
weak_object->UpdateWeakPointerAfterGc();
return weak_object->WasCollected();
}
} // namespace mozjs
} // namespace script
} // namespace cobalt