Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 1 | // Copyright 2015 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 | #ifndef V8_COMPILER_GRAPH_TRIMMER_H_ |
| 6 | #define V8_COMPILER_GRAPH_TRIMMER_H_ |
| 7 | |
| 8 | #include "src/compiler/node-marker.h" |
| 9 | |
| 10 | namespace v8 { |
| 11 | namespace internal { |
| 12 | namespace compiler { |
| 13 | |
| 14 | // Forward declarations. |
| 15 | class Graph; |
| 16 | |
| 17 | |
| 18 | // Trims dead nodes from the node graph. |
| 19 | class GraphTrimmer final { |
| 20 | public: |
| 21 | GraphTrimmer(Zone* zone, Graph* graph); |
| 22 | ~GraphTrimmer(); |
| 23 | |
| 24 | // Trim nodes in the {graph} that are not reachable from {graph->end()}. |
| 25 | void TrimGraph(); |
| 26 | |
| 27 | // Trim nodes in the {graph} that are not reachable from either {graph->end()} |
| 28 | // or any of the roots in the sequence [{begin},{end}[. |
| 29 | template <typename ForwardIterator> |
| 30 | void TrimGraph(ForwardIterator begin, ForwardIterator end) { |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 31 | while (begin != end) { |
| 32 | Node* const node = *begin++; |
| 33 | if (!node->IsDead()) MarkAsLive(node); |
| 34 | } |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 35 | TrimGraph(); |
| 36 | } |
| 37 | |
| 38 | private: |
| 39 | V8_INLINE bool IsLive(Node* const node) { return is_live_.Get(node); } |
| 40 | V8_INLINE void MarkAsLive(Node* const node) { |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 41 | DCHECK(!node->IsDead()); |
| 42 | if (!IsLive(node)) { |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 43 | is_live_.Set(node, true); |
| 44 | live_.push_back(node); |
| 45 | } |
| 46 | } |
| 47 | |
| 48 | Graph* graph() const { return graph_; } |
| 49 | |
| 50 | Graph* const graph_; |
| 51 | NodeMarker<bool> is_live_; |
| 52 | NodeVector live_; |
| 53 | |
| 54 | DISALLOW_COPY_AND_ASSIGN(GraphTrimmer); |
| 55 | }; |
| 56 | |
| 57 | } // namespace compiler |
| 58 | } // namespace internal |
| 59 | } // namespace v8 |
| 60 | |
| 61 | #endif // V8_COMPILER_GRAPH_TRIMMER_H_ |