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.
5 #ifndef V8_COMPILER_SOURCE_POSITION_H_
6 #define V8_COMPILER_SOURCE_POSITION_H_
8 #include "src/assembler.h"
9 #include "src/compiler/node-aux-data.h"
15 // Encapsulates encoding and decoding of sources positions from which Nodes
17 class SourcePosition FINAL {
19 explicit SourcePosition(int raw = kUnknownPosition) : raw_(raw) {}
21 static SourcePosition Unknown() { return SourcePosition(kUnknownPosition); }
22 bool IsUnknown() const { return raw() == kUnknownPosition; }
24 static SourcePosition Invalid() { return SourcePosition(kInvalidPosition); }
25 bool IsInvalid() const { return raw() == kInvalidPosition; }
27 int raw() const { return raw_; }
30 static const int kInvalidPosition = -2;
31 static const int kUnknownPosition = RelocInfo::kNoPosition;
32 STATIC_ASSERT(kInvalidPosition != kUnknownPosition);
37 inline bool operator==(const SourcePosition& lhs, const SourcePosition& rhs) {
38 return lhs.raw() == rhs.raw();
41 inline bool operator!=(const SourcePosition& lhs, const SourcePosition& rhs) {
46 class SourcePositionTable FINAL {
50 Scope(SourcePositionTable* source_positions, SourcePosition position)
51 : source_positions_(source_positions),
52 prev_position_(source_positions->current_position_) {
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));
60 ~Scope() { source_positions_->current_position_ = prev_position_; }
63 void Init(SourcePosition position) {
64 if (!position.IsUnknown() || prev_position_.IsInvalid()) {
65 source_positions_->current_position_ = position;
69 SourcePositionTable* source_positions_;
70 SourcePosition prev_position_;
71 DISALLOW_COPY_AND_ASSIGN(Scope);
74 explicit SourcePositionTable(Graph* graph);
75 ~SourcePositionTable() {
76 if (decorator_ != NULL) RemoveDecorator();
80 void RemoveDecorator();
82 SourcePosition GetSourcePosition(Node* node) const;
88 Decorator* decorator_;
89 SourcePosition current_position_;
90 NodeAuxData<SourcePosition> table_;
92 DISALLOW_COPY_AND_ASSIGN(SourcePositionTable);
95 } // namespace compiler
96 } // namespace internal