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_COMPILER_SOURCE_POSITION_TABLE_H_
6#define V8_COMPILER_COMPILER_SOURCE_POSITION_TABLE_H_
7
8#include "src/base/compiler-specific.h"
9#include "src/codegen/source-position.h"
10#include "src/common/globals.h"
11#include "src/compiler/node-aux-data.h"
12
13namespace v8 {
14namespace internal {
15namespace compiler {
16
17class V8_EXPORT_PRIVATE SourcePositionTable final
18    : public NON_EXPORTED_BASE(ZoneObject) {
19 public:
20  class V8_NODISCARD Scope final {
21   public:
22    Scope(SourcePositionTable* source_positions, SourcePosition position)
23        : source_positions_(source_positions),
24          prev_position_(source_positions->current_position_) {
25      Init(position);
26    }
27    Scope(SourcePositionTable* source_positions, Node* node)
28        : source_positions_(source_positions),
29          prev_position_(source_positions->current_position_) {
30      Init(source_positions_->GetSourcePosition(node));
31    }
32    ~Scope() { source_positions_->current_position_ = prev_position_; }
33    Scope(const Scope&) = delete;
34    Scope& operator=(const Scope&) = delete;
35
36   private:
37    void Init(SourcePosition position) {
38      if (position.IsKnown()) source_positions_->current_position_ = position;
39    }
40
41    SourcePositionTable* const source_positions_;
42    SourcePosition const prev_position_;
43  };
44
45  explicit SourcePositionTable(Graph* graph);
46  SourcePositionTable(const SourcePositionTable&) = delete;
47  SourcePositionTable& operator=(const SourcePositionTable&) = delete;
48
49  void AddDecorator();
50  void RemoveDecorator();
51
52  SourcePosition GetSourcePosition(Node* node) const;
53  void SetSourcePosition(Node* node, SourcePosition position);
54
55  void SetCurrentPosition(const SourcePosition& pos) {
56    current_position_ = pos;
57  }
58  SourcePosition GetCurrentPosition() const { return current_position_; }
59
60  void PrintJson(std::ostream& os) const;
61
62 private:
63  class Decorator;
64
65  static SourcePosition UnknownSourcePosition(Zone* zone) {
66    return SourcePosition::Unknown();
67  }
68
69  Graph* const graph_;
70  Decorator* decorator_;
71  SourcePosition current_position_;
72  NodeAuxData<SourcePosition, UnknownSourcePosition> table_;
73};
74
75}  // namespace compiler
76}  // namespace internal
77}  // namespace v8
78
79#endif  // V8_COMPILER_COMPILER_SOURCE_POSITION_TABLE_H_
80