1// Copyright 2021 the V8 project authors. All rights reserved.
2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4
5#include "src/compiler/node-observer.h"
6
7#include "src/compiler/node-properties.h"
8
9namespace v8 {
10namespace internal {
11namespace compiler {
12
13ObservableNodeState::ObservableNodeState(const Node* node, Zone* zone)
14    : id_(node->id()),
15      op_(node->op()),
16      type_(NodeProperties::GetTypeOrAny(node)) {}
17
18void ObserveNodeManager::StartObserving(Node* node, NodeObserver* observer) {
19  DCHECK_NOT_NULL(node);
20  DCHECK_NOT_NULL(observer);
21  DCHECK(observations_.find(node->id()) == observations_.end());
22
23  observer->set_has_observed_changes();
24  NodeObserver::Observation observation = observer->OnNodeCreated(node);
25  if (observation == NodeObserver::Observation::kContinue) {
26    observations_[node->id()] =
27        zone_->New<NodeObservation>(observer, node, zone_);
28  } else {
29    DCHECK_EQ(observation, NodeObserver::Observation::kStop);
30  }
31}
32
33void ObserveNodeManager::OnNodeChanged(const char* reducer_name,
34                                       const Node* old_node,
35                                       const Node* new_node) {
36  const auto it = observations_.find(old_node->id());
37  if (it == observations_.end()) return;
38
39  ObservableNodeState new_state{new_node, zone_};
40  NodeObservation* observation = it->second;
41  if (observation->state == new_state) return;
42
43  ObservableNodeState old_state = observation->state;
44  observation->state = new_state;
45
46  NodeObserver::Observation result =
47      observation->observer->OnNodeChanged(reducer_name, new_node, old_state);
48  if (result == NodeObserver::Observation::kStop) {
49    observations_.erase(old_node->id());
50  } else {
51    DCHECK_EQ(result, NodeObserver::Observation::kContinue);
52    if (old_node != new_node) {
53      observations_.erase(old_node->id());
54      observations_[new_node->id()] = observation;
55    }
56  }
57}
58
59}  // namespace compiler
60}  // namespace internal
61}  // namespace v8
62