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38692459 | 1 | /* Map logical line numbers to (source file, line number) pairs. |
2 | Copyright (C) 2001 | |
3 | Free Software Foundation, Inc. | |
4 | ||
5 | This program is free software; you can redistribute it and/or modify it | |
6 | under the terms of the GNU General Public License as published by the | |
7 | Free Software Foundation; either version 2, or (at your option) any | |
8 | later version. | |
9 | ||
10 | This program is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | GNU General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU General Public License | |
16 | along with this program; if not, write to the Free Software | |
17 | Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
18 | ||
19 | In other words, you are welcome to use, share and improve this program. | |
20 | You are forbidden to forbid anyone else to use, share and improve | |
21 | what you give them. Help stamp out software-hoarding! */ | |
22 | ||
23 | #include "config.h" | |
24 | #include "system.h" | |
25 | #include "line-map.h" | |
bd507c05 | 26 | #include "intl.h" |
38692459 | 27 | |
6d0a3bf2 | 28 | static void trace_include (const struct line_maps *, const struct line_map *); |
438ac94c | 29 | |
38692459 | 30 | /* Initialize a line map set. */ |
31 | ||
32 | void | |
196ce2be | 33 | linemap_init (struct line_maps *set) |
38692459 | 34 | { |
35 | set->maps = 0; | |
36 | set->allocated = 0; | |
37 | set->used = 0; | |
bd507c05 | 38 | set->last_listed = -1; |
438ac94c | 39 | set->trace_includes = false; |
4087823d | 40 | set->depth = 0; |
38692459 | 41 | } |
42 | ||
43 | /* Free a line map set. */ | |
44 | ||
bd507c05 | 45 | void |
196ce2be | 46 | linemap_free (struct line_maps *set) |
38692459 | 47 | { |
48 | if (set->maps) | |
bd507c05 | 49 | { |
bd507c05 | 50 | struct line_map *map; |
51 | ||
f85fcf2b | 52 | /* Depending upon whether we are handling preprocessed input or |
53 | not, this can be a user error or an ICE. */ | |
bd507c05 | 54 | for (map = CURRENT_LINE_MAP (set); ! MAIN_FILE_P (map); |
55 | map = INCLUDED_FROM (set, map)) | |
56 | fprintf (stderr, "line-map.c: file \"%s\" entered but not left\n", | |
57 | map->to_file); | |
f85fcf2b | 58 | |
bd507c05 | 59 | free (set->maps); |
60 | } | |
38692459 | 61 | } |
62 | ||
63 | /* Add a mapping of logical source line to physical source file and | |
748b50a3 | 64 | line number. |
65 | ||
66 | The text pointed to by TO_FILE must have a lifetime | |
67 | at least as long as the final call to lookup_line (). An empty | |
68 | TO_FILE means standard input. If reason is LC_LEAVE, and | |
69 | TO_FILE is NULL, then TO_FILE, TO_LINE and SYSP are given their | |
70 | natural values considering the file we are returning to. | |
38692459 | 71 | |
72 | FROM_LINE should be monotonic increasing across calls to this | |
748b50a3 | 73 | function. A call to this function can relocate the previous set of |
74 | maps, so any stored line_map pointers should not be used. */ | |
38692459 | 75 | |
f85fcf2b | 76 | const struct line_map * |
196ce2be | 77 | linemap_add (struct line_maps *set, enum lc_reason reason, |
78 | unsigned int sysp, unsigned int from_line, | |
79 | const char *to_file, unsigned int to_line) | |
38692459 | 80 | { |
81 | struct line_map *map; | |
82 | ||
83 | if (set->used && from_line < set->maps[set->used - 1].from_line) | |
84 | abort (); | |
85 | ||
86 | if (set->used == set->allocated) | |
87 | { | |
88 | set->allocated = 2 * set->allocated + 256; | |
f0af5a88 | 89 | set->maps = xrealloc (set->maps, set->allocated * sizeof (struct line_map)); |
38692459 | 90 | } |
91 | ||
4087823d | 92 | map = &set->maps[set->used++]; |
38692459 | 93 | |
748b50a3 | 94 | if (to_file && *to_file == '\0') |
95 | to_file = "<stdin>"; | |
96 | ||
bd507c05 | 97 | /* If we don't keep our line maps consistent, we can easily |
98 | segfault. Don't rely on the client to do it for us. */ | |
4087823d | 99 | if (set->depth == 0) |
bd507c05 | 100 | reason = LC_ENTER; |
101 | else if (reason == LC_LEAVE) | |
102 | { | |
f85fcf2b | 103 | struct line_map *from; |
104 | bool error; | |
105 | ||
106 | if (MAIN_FILE_P (map - 1)) | |
bd507c05 | 107 | { |
4d1574ae | 108 | if (to_file == NULL) |
109 | { | |
110 | set->depth--; | |
111 | set->used--; | |
112 | return NULL; | |
113 | } | |
114 | error = true; | |
115 | reason = LC_RENAME; | |
116 | from = map - 1; | |
f85fcf2b | 117 | } |
118 | else | |
119 | { | |
120 | from = INCLUDED_FROM (set, map - 1); | |
121 | error = to_file && strcmp (from->to_file, to_file); | |
122 | } | |
123 | ||
124 | /* Depending upon whether we are handling preprocessed input or | |
125 | not, this can be a user error or an ICE. */ | |
126 | if (error) | |
127 | fprintf (stderr, "line-map.c: file \"%s\" left but not entered\n", | |
128 | to_file); | |
129 | ||
130 | /* A TO_FILE of NULL is special - we use the natural values. */ | |
131 | if (error || to_file == NULL) | |
132 | { | |
133 | to_file = from->to_file; | |
134 | to_line = LAST_SOURCE_LINE (from) + 1; | |
135 | sysp = from->sysp; | |
bd507c05 | 136 | } |
137 | } | |
138 | ||
f85fcf2b | 139 | map->reason = reason; |
140 | map->sysp = sysp; | |
141 | map->from_line = from_line; | |
142 | map->to_file = to_file; | |
143 | map->to_line = to_line; | |
144 | ||
bd507c05 | 145 | if (reason == LC_ENTER) |
4087823d | 146 | { |
e9f0d687 | 147 | map->included_from = set->depth == 0 ? -1 : (int) (set->used - 2); |
4087823d | 148 | set->depth++; |
4087823d | 149 | if (set->trace_includes) |
150 | trace_include (set, map); | |
151 | } | |
38692459 | 152 | else if (reason == LC_RENAME) |
153 | map->included_from = map[-1].included_from; | |
154 | else if (reason == LC_LEAVE) | |
4087823d | 155 | { |
156 | set->depth--; | |
157 | map->included_from = INCLUDED_FROM (set, map - 1)->included_from; | |
158 | } | |
438ac94c | 159 | |
38692459 | 160 | return map; |
161 | } | |
162 | ||
a98af3e0 | 163 | /* Given a logical line, returns the map from which the corresponding |
164 | (source file, line) pair can be deduced. Since the set is built | |
165 | chronologically, the logical lines are monotonic increasing, and so | |
166 | the list is sorted and we can use a binary search. */ | |
38692459 | 167 | |
f85fcf2b | 168 | const struct line_map * |
196ce2be | 169 | linemap_lookup (struct line_maps *set, unsigned int line) |
38692459 | 170 | { |
171 | unsigned int md, mn = 0, mx = set->used; | |
172 | ||
173 | if (mx == 0) | |
174 | abort (); | |
175 | ||
176 | while (mx - mn > 1) | |
177 | { | |
178 | md = (mn + mx) / 2; | |
179 | if (set->maps[md].from_line > line) | |
180 | mx = md; | |
181 | else | |
182 | mn = md; | |
183 | } | |
184 | ||
185 | return &set->maps[mn]; | |
186 | } | |
bd507c05 | 187 | |
188 | /* Print the file names and line numbers of the #include commands | |
189 | which led to the map MAP, if any, to stderr. Nothing is output if | |
190 | the most recently listed stack is the same as the current one. */ | |
191 | ||
192 | void | |
196ce2be | 193 | linemap_print_containing_files (struct line_maps *set, |
194 | const struct line_map *map) | |
bd507c05 | 195 | { |
196 | if (MAIN_FILE_P (map) || set->last_listed == map->included_from) | |
197 | return; | |
198 | ||
199 | set->last_listed = map->included_from; | |
200 | map = INCLUDED_FROM (set, map); | |
201 | ||
202 | fprintf (stderr, _("In file included from %s:%u"), | |
203 | map->to_file, LAST_SOURCE_LINE (map)); | |
204 | ||
205 | while (! MAIN_FILE_P (map)) | |
206 | { | |
207 | map = INCLUDED_FROM (set, map); | |
208 | /* Translators note: this message is used in conjunction | |
209 | with "In file included from %s:%ld" and some other | |
210 | tricks. We want something like this: | |
211 | ||
212 | | In file included from sys/select.h:123, | |
213 | | from sys/types.h:234, | |
214 | | from userfile.c:31: | |
215 | | bits/select.h:45: <error message here> | |
216 | ||
217 | with all the "from"s lined up. | |
218 | The trailing comma is at the beginning of this message, | |
219 | and the trailing colon is not translated. */ | |
220 | fprintf (stderr, _(",\n from %s:%u"), | |
221 | map->to_file, LAST_SOURCE_LINE (map)); | |
222 | } | |
223 | ||
224 | fputs (":\n", stderr); | |
225 | } | |
438ac94c | 226 | |
227 | /* Print an include trace, for e.g. the -H option of the preprocessor. */ | |
228 | ||
229 | static void | |
6d0a3bf2 | 230 | trace_include (const struct line_maps *set, const struct line_map *map) |
438ac94c | 231 | { |
4087823d | 232 | unsigned int i = set->depth; |
438ac94c | 233 | |
4087823d | 234 | while (--i) |
438ac94c | 235 | putc ('.', stderr); |
236 | fprintf (stderr, " %s\n", map->to_file); | |
237 | } |