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1 // Copyright 2018 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_TORQUE_SOURCE_POSITIONS_H_
6 #define V8_TORQUE_SOURCE_POSITIONS_H_
7 
8 #include <iostream>
9 
10 #include "src/torque/contextual.h"
11 
12 namespace v8 {
13 namespace internal {
14 namespace torque {
15 
16 struct SourcePosition;
17 
18 class SourceId {
19  public:
Invalid()20   static SourceId Invalid() { return SourceId(-1); }
IsValid()21   bool IsValid() const { return id_ != -1; }
22   int operator==(const SourceId& s) const { return id_ == s.id_; }
23   bool operator<(const SourceId& s) const { return id_ < s.id_; }
24 
25  private:
SourceId(int id)26   explicit SourceId(int id) : id_(id) {}
27   int id_;
28   friend struct SourcePosition;
29   friend class SourceFileMap;
30 };
31 
32 struct LineAndColumn {
33   static constexpr int kUnknownOffset = -1;
34 
35   int offset;
36   int line;
37   int column;
38 
InvalidLineAndColumn39   static LineAndColumn Invalid() { return {-1, -1, -1}; }
WithUnknownOffsetLineAndColumn40   static LineAndColumn WithUnknownOffset(int line, int column) {
41     return {kUnknownOffset, line, column};
42   }
43 
44   bool operator==(const LineAndColumn& other) const {
45     if (offset == kUnknownOffset || other.offset == kUnknownOffset) {
46       return line == other.line && column == other.column;
47     }
48     DCHECK_EQ(offset == other.offset,
49               line == other.line && column == other.column);
50     return offset == other.offset;
51   }
52   bool operator!=(const LineAndColumn& other) const {
53     return !operator==(other);
54   }
55 };
56 
57 struct SourcePosition {
58   SourceId source;
59   LineAndColumn start;
60   LineAndColumn end;
61 
InvalidSourcePosition62   static SourcePosition Invalid() {
63     SourcePosition pos{SourceId::Invalid(), LineAndColumn::Invalid(),
64                        LineAndColumn::Invalid()};
65     return pos;
66   }
67 
CompareStartIgnoreColumnSourcePosition68   bool CompareStartIgnoreColumn(const SourcePosition& pos) const {
69     return start.line == pos.start.line && source == pos.source;
70   }
71 
ContainsSourcePosition72   bool Contains(LineAndColumn pos) const {
73     if (pos.line < start.line || pos.line > end.line) return false;
74 
75     if (pos.line == start.line && pos.column < start.column) return false;
76     if (pos.line == end.line && pos.column >= end.column) return false;
77     return true;
78   }
79 
80   bool operator==(const SourcePosition& pos) const {
81     return source == pos.source && start == pos.start && end == pos.end;
82   }
83   bool operator!=(const SourcePosition& pos) const { return !(*this == pos); }
84 };
85 
86 DECLARE_CONTEXTUAL_VARIABLE(CurrentSourceFile, SourceId);
87 DECLARE_CONTEXTUAL_VARIABLE(CurrentSourcePosition, SourcePosition);
88 
89 class V8_EXPORT_PRIVATE SourceFileMap : public ContextualClass<SourceFileMap> {
90  public:
SourceFileMap(std::string v8_root)91   explicit SourceFileMap(std::string v8_root) : v8_root_(std::move(v8_root)) {}
92   static const std::string& PathFromV8Root(SourceId file);
93   static std::string PathFromV8RootWithoutExtension(SourceId file);
94   static std::string AbsolutePath(SourceId file);
95   static SourceId AddSource(std::string path);
96   static SourceId GetSourceId(const std::string& path);
97   static std::vector<SourceId> AllSources();
98   static bool FileRelativeToV8RootExists(const std::string& path);
99 
100  private:
101   std::vector<std::string> sources_;
102   std::string v8_root_;
103 };
104 
PositionAsString(SourcePosition pos)105 inline std::string PositionAsString(SourcePosition pos) {
106   return SourceFileMap::PathFromV8Root(pos.source) + ":" +
107          std::to_string(pos.start.line + 1) + ":" +
108          std::to_string(pos.start.column + 1);
109 }
110 
111 inline std::ostream& operator<<(std::ostream& out, SourcePosition pos) {
112   return out << "https://source.chromium.org/chromium/chromium/src/+/main:v8/"
113              << SourceFileMap::PathFromV8Root(pos.source)
114              << "?l=" << (pos.start.line + 1)
115              << "&c=" << (pos.start.column + 1);
116 }
117 
118 }  // namespace torque
119 }  // namespace internal
120 }  // namespace v8
121 
122 #endif  // V8_TORQUE_SOURCE_POSITIONS_H_
123