1 // go-linemap.cc -- GCC implementation of Linemap.
2
3 // Copyright 2011 The Go Authors. All rights reserved.
4 // Use of this source code is governed by a BSD-style
5 // license that can be found in the LICENSE file.
6
7 #include "go-linemap.h"
8
9 #include "go-gcc.h"
10
11 // This class implements the Linemap interface defined by the
12 // frontend.
13
14 class Gcc_linemap : public Linemap
15 {
16 public:
Gcc_linemap()17 Gcc_linemap()
18 : Linemap(),
19 in_file_(false)
20 { }
21
22 void
23 start_file(const char* file_name, unsigned int line_begin);
24
25 void
26 start_line(unsigned int line_number, unsigned int line_size);
27
28 Location
29 get_location(unsigned int column);
30
31 void
32 stop();
33
34 std::string
35 to_string(Location);
36
37 std::string
38 location_file(Location);
39
40 int
41 location_line(Location);
42
43 protected:
44 Location
45 get_predeclared_location();
46
47 Location
48 get_unknown_location();
49
50 bool
51 is_predeclared(Location);
52
53 bool
54 is_unknown(Location);
55
56 private:
57 // Whether we are currently reading a file.
58 bool in_file_;
59 };
60
61 Linemap* Linemap::instance_ = NULL;
62
63 // Start getting locations from a new file.
64
65 void
start_file(const char * file_name,unsigned line_begin)66 Gcc_linemap::start_file(const char *file_name, unsigned line_begin)
67 {
68 if (this->in_file_)
69 linemap_add(line_table, LC_LEAVE, 0, NULL, 0);
70 linemap_add(line_table, LC_ENTER, 0, file_name, line_begin);
71 this->in_file_ = true;
72 }
73
74 // Stringify a location
75
76 std::string
to_string(Location location)77 Gcc_linemap::to_string(Location location)
78 {
79 const line_map_ordinary *lmo;
80 location_t resolved_location;
81
82 // Screen out unknown and predeclared locations; produce output
83 // only for simple file:line locations.
84 resolved_location =
85 linemap_resolve_location (line_table, location.gcc_location(),
86 LRK_SPELLING_LOCATION, &lmo);
87 if (lmo == NULL || resolved_location < RESERVED_LOCATION_COUNT)
88 return "";
89 const char *path = LINEMAP_FILE (lmo);
90 if (!path)
91 return "";
92
93 // Strip the source file down to the base file, to reduce clutter.
94 std::stringstream ss;
95 ss << lbasename(path) << ":" << SOURCE_LINE (lmo, location.gcc_location());
96 return ss.str();
97 }
98
99 // Return the file name for a given location.
100
101 std::string
location_file(Location loc)102 Gcc_linemap::location_file(Location loc)
103 {
104 return LOCATION_FILE(loc.gcc_location());
105 }
106
107 // Return the line number for a given location.
108
109 int
location_line(Location loc)110 Gcc_linemap::location_line(Location loc)
111 {
112 return LOCATION_LINE(loc.gcc_location());
113 }
114
115 // Stop getting locations.
116
117 void
stop()118 Gcc_linemap::stop()
119 {
120 linemap_add(line_table, LC_LEAVE, 0, NULL, 0);
121 this->in_file_ = false;
122 }
123
124 // Start a new line.
125
126 void
start_line(unsigned lineno,unsigned linesize)127 Gcc_linemap::start_line(unsigned lineno, unsigned linesize)
128 {
129 linemap_line_start(line_table, lineno, linesize);
130 }
131
132 // Get a location.
133
134 Location
get_location(unsigned column)135 Gcc_linemap::get_location(unsigned column)
136 {
137 return Location(linemap_position_for_column(line_table, column));
138 }
139
140 // Get the unknown location.
141
142 Location
get_unknown_location()143 Gcc_linemap::get_unknown_location()
144 {
145 return Location(UNKNOWN_LOCATION);
146 }
147
148 // Get the predeclared location.
149
150 Location
get_predeclared_location()151 Gcc_linemap::get_predeclared_location()
152 {
153 return Location(BUILTINS_LOCATION);
154 }
155
156 // Return whether a location is the predeclared location.
157
158 bool
is_predeclared(Location loc)159 Gcc_linemap::is_predeclared(Location loc)
160 {
161 return loc.gcc_location() == BUILTINS_LOCATION;
162 }
163
164 // Return whether a location is the unknown location.
165
166 bool
is_unknown(Location loc)167 Gcc_linemap::is_unknown(Location loc)
168 {
169 return loc.gcc_location() == UNKNOWN_LOCATION;
170 }
171
172 // Return the Linemap to use for the gcc backend.
173
174 Linemap*
go_get_linemap()175 go_get_linemap()
176 {
177 return new Gcc_linemap;
178 }
179