Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame^] | 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 |
| 3 | // found in the LICENSE file. |
| 4 | |
| 5 | #ifndef V8_COMPILER_SOURCE_POSITION_H_ |
| 6 | #define V8_COMPILER_SOURCE_POSITION_H_ |
| 7 | |
| 8 | #include "src/assembler.h" |
| 9 | #include "src/compiler/node-aux-data.h" |
| 10 | |
| 11 | namespace v8 { |
| 12 | namespace internal { |
| 13 | namespace compiler { |
| 14 | |
| 15 | // Encapsulates encoding and decoding of sources positions from which Nodes |
| 16 | // originated. |
| 17 | class SourcePosition FINAL { |
| 18 | public: |
| 19 | explicit SourcePosition(int raw = kUnknownPosition) : raw_(raw) {} |
| 20 | |
| 21 | static SourcePosition Unknown() { return SourcePosition(kUnknownPosition); } |
| 22 | bool IsUnknown() const { return raw() == kUnknownPosition; } |
| 23 | |
| 24 | static SourcePosition Invalid() { return SourcePosition(kInvalidPosition); } |
| 25 | bool IsInvalid() const { return raw() == kInvalidPosition; } |
| 26 | |
| 27 | int raw() const { return raw_; } |
| 28 | |
| 29 | private: |
| 30 | static const int kInvalidPosition = -2; |
| 31 | static const int kUnknownPosition = RelocInfo::kNoPosition; |
| 32 | STATIC_ASSERT(kInvalidPosition != kUnknownPosition); |
| 33 | int raw_; |
| 34 | }; |
| 35 | |
| 36 | |
| 37 | inline bool operator==(const SourcePosition& lhs, const SourcePosition& rhs) { |
| 38 | return lhs.raw() == rhs.raw(); |
| 39 | } |
| 40 | |
| 41 | inline bool operator!=(const SourcePosition& lhs, const SourcePosition& rhs) { |
| 42 | return !(lhs == rhs); |
| 43 | } |
| 44 | |
| 45 | |
| 46 | class SourcePositionTable FINAL { |
| 47 | public: |
| 48 | class Scope { |
| 49 | public: |
| 50 | Scope(SourcePositionTable* source_positions, SourcePosition position) |
| 51 | : source_positions_(source_positions), |
| 52 | prev_position_(source_positions->current_position_) { |
| 53 | Init(position); |
| 54 | } |
| 55 | Scope(SourcePositionTable* source_positions, Node* node) |
| 56 | : source_positions_(source_positions), |
| 57 | prev_position_(source_positions->current_position_) { |
| 58 | Init(source_positions_->GetSourcePosition(node)); |
| 59 | } |
| 60 | ~Scope() { source_positions_->current_position_ = prev_position_; } |
| 61 | |
| 62 | private: |
| 63 | void Init(SourcePosition position) { |
| 64 | if (!position.IsUnknown() || prev_position_.IsInvalid()) { |
| 65 | source_positions_->current_position_ = position; |
| 66 | } |
| 67 | } |
| 68 | |
| 69 | SourcePositionTable* source_positions_; |
| 70 | SourcePosition prev_position_; |
| 71 | DISALLOW_COPY_AND_ASSIGN(Scope); |
| 72 | }; |
| 73 | |
| 74 | explicit SourcePositionTable(Graph* graph); |
| 75 | ~SourcePositionTable() { |
| 76 | if (decorator_ != NULL) RemoveDecorator(); |
| 77 | } |
| 78 | |
| 79 | void AddDecorator(); |
| 80 | void RemoveDecorator(); |
| 81 | |
| 82 | SourcePosition GetSourcePosition(Node* node); |
| 83 | |
| 84 | private: |
| 85 | class Decorator; |
| 86 | |
| 87 | Graph* graph_; |
| 88 | Decorator* decorator_; |
| 89 | SourcePosition current_position_; |
| 90 | NodeAuxData<SourcePosition> table_; |
| 91 | |
| 92 | DISALLOW_COPY_AND_ASSIGN(SourcePositionTable); |
| 93 | }; |
| 94 | |
| 95 | } // namespace compiler |
| 96 | } // namespace internal |
| 97 | } // namespace v8 |
| 98 | |
| 99 | #endif |