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1 // Copyright 2014 the V8 project authors. All rights reserved. | 1 // Copyright 2014 the V8 project authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #include <functional> | 5 #include <functional> |
6 #include <limits> | 6 #include <limits> |
7 | 7 |
8 #include "src/compiler/graph.h" | 8 #include "src/compiler/graph.h" |
9 #include "src/compiler/graph-reducer.h" | 9 #include "src/compiler/graph-reducer.h" |
10 #include "src/compiler/node.h" | 10 #include "src/compiler/node.h" |
11 #include "src/compiler/node-properties.h" | 11 #include "src/compiler/node-properties.h" |
12 #include "src/compiler/verifier.h" | 12 #include "src/compiler/verifier.h" |
13 | 13 |
14 namespace v8 { | 14 namespace v8 { |
15 namespace internal { | 15 namespace internal { |
16 namespace compiler { | 16 namespace compiler { |
17 | 17 |
18 enum class GraphReducer::State : uint8_t { | 18 enum class GraphReducer::State : uint8_t { |
19 kUnvisited, | 19 kUnvisited, |
20 kRevisit, | 20 kRevisit, |
21 kOnStack, | 21 kOnStack, |
22 kVisited | 22 kVisited |
23 }; | 23 }; |
24 | 24 |
25 | 25 |
| 26 void Reducer::Finalize() {} |
| 27 |
| 28 |
26 GraphReducer::GraphReducer(Zone* zone, Graph* graph, Node* dead) | 29 GraphReducer::GraphReducer(Zone* zone, Graph* graph, Node* dead) |
27 : graph_(graph), | 30 : graph_(graph), |
28 dead_(dead), | 31 dead_(dead), |
29 state_(graph, 4), | 32 state_(graph, 4), |
30 reducers_(zone), | 33 reducers_(zone), |
31 revisit_(zone), | 34 revisit_(zone), |
32 stack_(zone) {} | 35 stack_(zone) {} |
33 | 36 |
34 | 37 |
35 GraphReducer::~GraphReducer() {} | 38 GraphReducer::~GraphReducer() {} |
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51 ReduceTop(); | 54 ReduceTop(); |
52 } else if (!revisit_.empty()) { | 55 } else if (!revisit_.empty()) { |
53 // If the stack becomes empty, revisit any nodes in the revisit queue. | 56 // If the stack becomes empty, revisit any nodes in the revisit queue. |
54 Node* const node = revisit_.top(); | 57 Node* const node = revisit_.top(); |
55 revisit_.pop(); | 58 revisit_.pop(); |
56 if (state_.Get(node) == State::kRevisit) { | 59 if (state_.Get(node) == State::kRevisit) { |
57 // state can change while in queue. | 60 // state can change while in queue. |
58 Push(node); | 61 Push(node); |
59 } | 62 } |
60 } else { | 63 } else { |
61 break; | 64 // Run all finalizers. |
| 65 for (Reducer* const reducer : reducers_) reducer->Finalize(); |
| 66 |
| 67 // Check if we have new nodes to revisit. |
| 68 if (revisit_.empty()) break; |
62 } | 69 } |
63 } | 70 } |
64 DCHECK(revisit_.empty()); | 71 DCHECK(revisit_.empty()); |
65 DCHECK(stack_.empty()); | 72 DCHECK(stack_.empty()); |
66 } | 73 } |
67 | 74 |
68 | 75 |
69 void GraphReducer::ReduceGraph() { ReduceNode(graph()->end()); } | 76 void GraphReducer::ReduceGraph() { ReduceNode(graph()->end()); } |
70 | 77 |
71 | 78 |
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254 void GraphReducer::Revisit(Node* node) { | 261 void GraphReducer::Revisit(Node* node) { |
255 if (state_.Get(node) == State::kVisited) { | 262 if (state_.Get(node) == State::kVisited) { |
256 state_.Set(node, State::kRevisit); | 263 state_.Set(node, State::kRevisit); |
257 revisit_.push(node); | 264 revisit_.push(node); |
258 } | 265 } |
259 } | 266 } |
260 | 267 |
261 } // namespace compiler | 268 } // namespace compiler |
262 } // namespace internal | 269 } // namespace internal |
263 } // namespace v8 | 270 } // namespace v8 |
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