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// Copyright 2021 the V8 project 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 "src/compiler/node-observer.h"
#include "src/compiler/node-properties.h"
namespace v8 {
namespace internal {
namespace compiler {
ObservableNodeState::ObservableNodeState(const Node* node, Zone* zone)
: id_(node->id()),
op_(node->op()),
type_(NodeProperties::GetTypeOrAny(node)) {}
void ObserveNodeManager::StartObserving(Node* node, NodeObserver* observer) {
DCHECK_NOT_NULL(node);
DCHECK_NOT_NULL(observer);
DCHECK(observations_.find(node->id()) == observations_.end());
observer->set_has_observed_changes();
NodeObserver::Observation observation = observer->OnNodeCreated(node);
if (observation == NodeObserver::Observation::kContinue) {
observations_[node->id()] =
zone_->New<NodeObservation>(observer, node, zone_);
} else {
DCHECK_EQ(observation, NodeObserver::Observation::kStop);
}
}
void ObserveNodeManager::OnNodeChanged(const char* reducer_name,
const Node* old_node,
const Node* new_node) {
const auto it = observations_.find(old_node->id());
if (it == observations_.end()) return;
ObservableNodeState new_state{new_node, zone_};
NodeObservation* observation = it->second;
if (observation->state == new_state) return;
ObservableNodeState old_state = observation->state;
observation->state = new_state;
NodeObserver::Observation result =
observation->observer->OnNodeChanged(reducer_name, new_node, old_state);
if (result == NodeObserver::Observation::kStop) {
observations_.erase(old_node->id());
} else {
DCHECK_EQ(result, NodeObserver::Observation::kContinue);
if (old_node != new_node) {
observations_.erase(old_node->id());
observations_[new_node->id()] = observation;
}
}
}
} // namespace compiler
} // namespace internal
} // namespace v8
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