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6de9cd9a | 1 | /* Character scanner. |
835aac92 | 2 | Copyright (C) 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008 |
ec378180 | 3 | Free Software Foundation, Inc. |
6de9cd9a DN |
4 | Contributed by Andy Vaught |
5 | ||
9fc4d79b | 6 | This file is part of GCC. |
6de9cd9a | 7 | |
9fc4d79b TS |
8 | GCC is free software; you can redistribute it and/or modify it under |
9 | the terms of the GNU General Public License as published by the Free | |
d234d788 | 10 | Software Foundation; either version 3, or (at your option) any later |
9fc4d79b | 11 | version. |
6de9cd9a | 12 | |
9fc4d79b TS |
13 | GCC is distributed in the hope that it will be useful, but WITHOUT ANY |
14 | WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
15 | FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
16 | for more details. | |
6de9cd9a DN |
17 | |
18 | You should have received a copy of the GNU General Public License | |
d234d788 NC |
19 | along with GCC; see the file COPYING3. If not see |
20 | <http://www.gnu.org/licenses/>. */ | |
6de9cd9a DN |
21 | |
22 | /* Set of subroutines to (ultimately) return the next character to the | |
23 | various matching subroutines. This file's job is to read files and | |
24 | build up lines that are parsed by the parser. This means that we | |
25 | handle continuation lines and "include" lines. | |
26 | ||
27 | The first thing the scanner does is to load an entire file into | |
28 | memory. We load the entire file into memory for a couple reasons. | |
29 | The first is that we want to be able to deal with nonseekable input | |
30 | (pipes, stdin) and there is a lot of backing up involved during | |
31 | parsing. | |
32 | ||
33 | The second is that we want to be able to print the locus of errors, | |
34 | and an error on line 999999 could conflict with something on line | |
35 | one. Given nonseekable input, we've got to store the whole thing. | |
36 | ||
37 | One thing that helps are the column truncation limits that give us | |
38 | an upper bound on the size of individual lines. We don't store the | |
39 | truncated stuff. | |
40 | ||
41 | From the scanner's viewpoint, the higher level subroutines ask for | |
42 | new characters and do a lot of jumping backwards. */ | |
43 | ||
44 | #include "config.h" | |
d22e4895 | 45 | #include "system.h" |
6de9cd9a | 46 | #include "gfortran.h" |
2d7c7df6 | 47 | #include "toplev.h" |
9e8a6720 FXC |
48 | #include "debug.h" |
49 | #include "flags.h" | |
6de9cd9a DN |
50 | |
51 | /* Structure for holding module and include file search path. */ | |
52 | typedef struct gfc_directorylist | |
53 | { | |
54 | char *path; | |
31198773 | 55 | bool use_for_modules; |
6de9cd9a DN |
56 | struct gfc_directorylist *next; |
57 | } | |
58 | gfc_directorylist; | |
59 | ||
60 | /* List of include file search directories. */ | |
31198773 | 61 | static gfc_directorylist *include_dirs, *intrinsic_modules_dirs; |
6de9cd9a | 62 | |
d4fa05b9 | 63 | static gfc_file *file_head, *current_file; |
6de9cd9a | 64 | |
6c7a4dfd | 65 | static int continue_flag, end_flag, openmp_flag; |
5a06474c | 66 | static int continue_count, continue_line; |
6c7a4dfd | 67 | static locus openmp_locus; |
6de9cd9a | 68 | |
d4fa05b9 TS |
69 | gfc_source_form gfc_current_form; |
70 | static gfc_linebuf *line_head, *line_tail; | |
71 | ||
63645982 | 72 | locus gfc_current_locus; |
e0bcf78c | 73 | const char *gfc_source_file; |
2d7c7df6 JJ |
74 | static FILE *gfc_src_file; |
75 | static char *gfc_src_preprocessor_lines[2]; | |
76 | ||
5a06474c | 77 | extern int pedantic; |
6de9cd9a | 78 | |
1b271c9b JJ |
79 | static struct gfc_file_change |
80 | { | |
81 | const char *filename; | |
82 | gfc_linebuf *lb; | |
83 | int line; | |
84 | } *file_changes; | |
85 | size_t file_changes_cur, file_changes_count; | |
86 | size_t file_changes_allocated; | |
87 | ||
6de9cd9a DN |
88 | /* Main scanner initialization. */ |
89 | ||
90 | void | |
91 | gfc_scanner_init_1 (void) | |
92 | { | |
d4fa05b9 TS |
93 | file_head = NULL; |
94 | line_head = NULL; | |
95 | line_tail = NULL; | |
6de9cd9a | 96 | |
5a06474c JD |
97 | continue_count = 0; |
98 | continue_line = 0; | |
99 | ||
6de9cd9a DN |
100 | end_flag = 0; |
101 | } | |
102 | ||
103 | ||
104 | /* Main scanner destructor. */ | |
105 | ||
106 | void | |
107 | gfc_scanner_done_1 (void) | |
108 | { | |
d4fa05b9 TS |
109 | gfc_linebuf *lb; |
110 | gfc_file *f; | |
6de9cd9a | 111 | |
d4fa05b9 | 112 | while(line_head != NULL) |
6de9cd9a | 113 | { |
d4fa05b9 TS |
114 | lb = line_head->next; |
115 | gfc_free(line_head); | |
116 | line_head = lb; | |
6de9cd9a | 117 | } |
d4fa05b9 TS |
118 | |
119 | while(file_head != NULL) | |
6de9cd9a | 120 | { |
d4fa05b9 TS |
121 | f = file_head->next; |
122 | gfc_free(file_head->filename); | |
123 | gfc_free(file_head); | |
124 | file_head = f; | |
6de9cd9a DN |
125 | } |
126 | } | |
127 | ||
128 | ||
129 | /* Adds path to the list pointed to by list. */ | |
130 | ||
31198773 FXC |
131 | static void |
132 | add_path_to_list (gfc_directorylist **list, const char *path, | |
133 | bool use_for_modules) | |
6de9cd9a DN |
134 | { |
135 | gfc_directorylist *dir; | |
136 | const char *p; | |
137 | ||
138 | p = path; | |
31198773 | 139 | while (*p == ' ' || *p == '\t') /* someone might do "-I include" */ |
6de9cd9a DN |
140 | if (*p++ == '\0') |
141 | return; | |
142 | ||
31198773 | 143 | dir = *list; |
6de9cd9a | 144 | if (!dir) |
31198773 | 145 | dir = *list = gfc_getmem (sizeof (gfc_directorylist)); |
6de9cd9a DN |
146 | else |
147 | { | |
148 | while (dir->next) | |
149 | dir = dir->next; | |
150 | ||
151 | dir->next = gfc_getmem (sizeof (gfc_directorylist)); | |
152 | dir = dir->next; | |
153 | } | |
154 | ||
155 | dir->next = NULL; | |
31198773 | 156 | dir->use_for_modules = use_for_modules; |
6de9cd9a DN |
157 | dir->path = gfc_getmem (strlen (p) + 2); |
158 | strcpy (dir->path, p); | |
159 | strcat (dir->path, "/"); /* make '/' last character */ | |
160 | } | |
161 | ||
162 | ||
31198773 FXC |
163 | void |
164 | gfc_add_include_path (const char *path, bool use_for_modules) | |
165 | { | |
166 | add_path_to_list (&include_dirs, path, use_for_modules); | |
167 | } | |
168 | ||
169 | ||
170 | void | |
171 | gfc_add_intrinsic_modules_path (const char *path) | |
172 | { | |
173 | add_path_to_list (&intrinsic_modules_dirs, path, true); | |
174 | } | |
175 | ||
176 | ||
6de9cd9a DN |
177 | /* Release resources allocated for options. */ |
178 | ||
179 | void | |
180 | gfc_release_include_path (void) | |
181 | { | |
182 | gfc_directorylist *p; | |
183 | ||
6de9cd9a DN |
184 | while (include_dirs != NULL) |
185 | { | |
186 | p = include_dirs; | |
187 | include_dirs = include_dirs->next; | |
188 | gfc_free (p->path); | |
189 | gfc_free (p); | |
190 | } | |
31198773 | 191 | |
31198773 FXC |
192 | while (intrinsic_modules_dirs != NULL) |
193 | { | |
194 | p = intrinsic_modules_dirs; | |
195 | intrinsic_modules_dirs = intrinsic_modules_dirs->next; | |
196 | gfc_free (p->path); | |
197 | gfc_free (p); | |
198 | } | |
1bc23383 FXC |
199 | |
200 | gfc_free (gfc_option.module_dir); | |
6de9cd9a DN |
201 | } |
202 | ||
6de9cd9a | 203 | |
31198773 FXC |
204 | static FILE * |
205 | open_included_file (const char *name, gfc_directorylist *list, bool module) | |
6de9cd9a | 206 | { |
200cfbe7 | 207 | char *fullname; |
6de9cd9a DN |
208 | gfc_directorylist *p; |
209 | FILE *f; | |
210 | ||
31198773 | 211 | for (p = list; p; p = p->next) |
b424a572 | 212 | { |
31198773 FXC |
213 | if (module && !p->use_for_modules) |
214 | continue; | |
6de9cd9a | 215 | |
200cfbe7 | 216 | fullname = (char *) alloca(strlen (p->path) + strlen (name) + 1); |
6de9cd9a DN |
217 | strcpy (fullname, p->path); |
218 | strcat (fullname, name); | |
219 | ||
220 | f = gfc_open_file (fullname); | |
221 | if (f != NULL) | |
222 | return f; | |
223 | } | |
224 | ||
225 | return NULL; | |
226 | } | |
227 | ||
31198773 FXC |
228 | |
229 | /* Opens file for reading, searching through the include directories | |
230 | given if necessary. If the include_cwd argument is true, we try | |
231 | to open the file in the current directory first. */ | |
232 | ||
233 | FILE * | |
234 | gfc_open_included_file (const char *name, bool include_cwd, bool module) | |
235 | { | |
236 | FILE *f; | |
237 | ||
e01f74e0 TB |
238 | if (IS_ABSOLUTE_PATH (name)) |
239 | return gfc_open_file (name); | |
240 | ||
31198773 FXC |
241 | if (include_cwd) |
242 | { | |
243 | f = gfc_open_file (name); | |
244 | if (f != NULL) | |
245 | return f; | |
246 | } | |
247 | ||
248 | return open_included_file (name, include_dirs, module); | |
249 | } | |
250 | ||
251 | FILE * | |
252 | gfc_open_intrinsic_module (const char *name) | |
253 | { | |
e01f74e0 TB |
254 | if (IS_ABSOLUTE_PATH (name)) |
255 | return gfc_open_file (name); | |
256 | ||
31198773 FXC |
257 | return open_included_file (name, intrinsic_modules_dirs, true); |
258 | } | |
259 | ||
edf1eac2 | 260 | |
6de9cd9a DN |
261 | /* Test to see if we're at the end of the main source file. */ |
262 | ||
263 | int | |
264 | gfc_at_end (void) | |
265 | { | |
6de9cd9a DN |
266 | return end_flag; |
267 | } | |
268 | ||
269 | ||
270 | /* Test to see if we're at the end of the current file. */ | |
271 | ||
272 | int | |
273 | gfc_at_eof (void) | |
274 | { | |
6de9cd9a DN |
275 | if (gfc_at_end ()) |
276 | return 1; | |
277 | ||
d4fa05b9 | 278 | if (line_head == NULL) |
6de9cd9a DN |
279 | return 1; /* Null file */ |
280 | ||
63645982 | 281 | if (gfc_current_locus.lb == NULL) |
6de9cd9a DN |
282 | return 1; |
283 | ||
284 | return 0; | |
285 | } | |
286 | ||
287 | ||
288 | /* Test to see if we're at the beginning of a new line. */ | |
289 | ||
290 | int | |
291 | gfc_at_bol (void) | |
292 | { | |
6de9cd9a DN |
293 | if (gfc_at_eof ()) |
294 | return 1; | |
295 | ||
63645982 | 296 | return (gfc_current_locus.nextc == gfc_current_locus.lb->line); |
6de9cd9a DN |
297 | } |
298 | ||
299 | ||
300 | /* Test to see if we're at the end of a line. */ | |
301 | ||
302 | int | |
303 | gfc_at_eol (void) | |
304 | { | |
6de9cd9a DN |
305 | if (gfc_at_eof ()) |
306 | return 1; | |
307 | ||
63645982 | 308 | return (*gfc_current_locus.nextc == '\0'); |
6de9cd9a DN |
309 | } |
310 | ||
60332588 | 311 | static void |
1b271c9b | 312 | add_file_change (const char *filename, int line) |
60332588 | 313 | { |
1b271c9b JJ |
314 | if (file_changes_count == file_changes_allocated) |
315 | { | |
316 | if (file_changes_allocated) | |
317 | file_changes_allocated *= 2; | |
318 | else | |
319 | file_changes_allocated = 16; | |
320 | file_changes | |
321 | = xrealloc (file_changes, | |
322 | file_changes_allocated * sizeof (*file_changes)); | |
323 | } | |
324 | file_changes[file_changes_count].filename = filename; | |
325 | file_changes[file_changes_count].lb = NULL; | |
326 | file_changes[file_changes_count++].line = line; | |
327 | } | |
60332588 | 328 | |
1b271c9b JJ |
329 | static void |
330 | report_file_change (gfc_linebuf *lb) | |
331 | { | |
332 | size_t c = file_changes_cur; | |
333 | while (c < file_changes_count | |
334 | && file_changes[c].lb == lb) | |
335 | { | |
336 | if (file_changes[c].filename) | |
337 | (*debug_hooks->start_source_file) (file_changes[c].line, | |
338 | file_changes[c].filename); | |
339 | else | |
340 | (*debug_hooks->end_source_file) (file_changes[c].line); | |
341 | ++c; | |
342 | } | |
343 | file_changes_cur = c; | |
60332588 JJ |
344 | } |
345 | ||
346 | void | |
347 | gfc_start_source_files (void) | |
348 | { | |
349 | /* If the debugger wants the name of the main source file, | |
350 | we give it. */ | |
351 | if (debug_hooks->start_end_main_source_file) | |
352 | (*debug_hooks->start_source_file) (0, gfc_source_file); | |
353 | ||
1b271c9b JJ |
354 | file_changes_cur = 0; |
355 | report_file_change (gfc_current_locus.lb); | |
60332588 JJ |
356 | } |
357 | ||
358 | void | |
359 | gfc_end_source_files (void) | |
360 | { | |
1b271c9b | 361 | report_file_change (NULL); |
60332588 JJ |
362 | |
363 | if (debug_hooks->start_end_main_source_file) | |
364 | (*debug_hooks->end_source_file) (0); | |
365 | } | |
6de9cd9a DN |
366 | |
367 | /* Advance the current line pointer to the next line. */ | |
368 | ||
369 | void | |
370 | gfc_advance_line (void) | |
371 | { | |
6de9cd9a | 372 | if (gfc_at_end ()) |
4a58b9ad | 373 | return; |
6de9cd9a | 374 | |
63645982 | 375 | if (gfc_current_locus.lb == NULL) |
6de9cd9a | 376 | { |
d4fa05b9 TS |
377 | end_flag = 1; |
378 | return; | |
379 | } | |
6de9cd9a | 380 | |
9e8a6720 | 381 | if (gfc_current_locus.lb->next |
60332588 | 382 | && !gfc_current_locus.lb->next->dbg_emitted) |
9e8a6720 | 383 | { |
1b271c9b | 384 | report_file_change (gfc_current_locus.lb->next); |
60332588 | 385 | gfc_current_locus.lb->next->dbg_emitted = true; |
9e8a6720 FXC |
386 | } |
387 | ||
63645982 | 388 | gfc_current_locus.lb = gfc_current_locus.lb->next; |
6de9cd9a | 389 | |
edf1eac2 | 390 | if (gfc_current_locus.lb != NULL) |
63645982 | 391 | gfc_current_locus.nextc = gfc_current_locus.lb->line; |
d4fa05b9 TS |
392 | else |
393 | { | |
63645982 | 394 | gfc_current_locus.nextc = NULL; |
d4fa05b9 TS |
395 | end_flag = 1; |
396 | } | |
6de9cd9a DN |
397 | } |
398 | ||
399 | ||
400 | /* Get the next character from the input, advancing gfc_current_file's | |
401 | locus. When we hit the end of the line or the end of the file, we | |
402 | start returning a '\n' in order to complete the current statement. | |
403 | No Fortran line conventions are implemented here. | |
404 | ||
405 | Requiring explicit advances to the next line prevents the parse | |
406 | pointer from being on the wrong line if the current statement ends | |
407 | prematurely. */ | |
408 | ||
409 | static int | |
410 | next_char (void) | |
411 | { | |
6de9cd9a | 412 | int c; |
d4fa05b9 | 413 | |
63645982 | 414 | if (gfc_current_locus.nextc == NULL) |
6de9cd9a DN |
415 | return '\n'; |
416 | ||
16a374c6 | 417 | c = (unsigned char) *gfc_current_locus.nextc++; |
6de9cd9a DN |
418 | if (c == '\0') |
419 | { | |
63645982 | 420 | gfc_current_locus.nextc--; /* Remain on this line. */ |
6de9cd9a DN |
421 | c = '\n'; |
422 | } | |
423 | ||
424 | return c; | |
425 | } | |
426 | ||
edf1eac2 | 427 | |
6de9cd9a DN |
428 | /* Skip a comment. When we come here the parse pointer is positioned |
429 | immediately after the comment character. If we ever implement | |
430 | compiler directives withing comments, here is where we parse the | |
431 | directive. */ | |
432 | ||
433 | static void | |
434 | skip_comment_line (void) | |
435 | { | |
436 | char c; | |
437 | ||
438 | do | |
439 | { | |
440 | c = next_char (); | |
441 | } | |
442 | while (c != '\n'); | |
443 | ||
444 | gfc_advance_line (); | |
445 | } | |
446 | ||
447 | ||
9e8a6720 FXC |
448 | int |
449 | gfc_define_undef_line (void) | |
450 | { | |
451 | /* All lines beginning with '#' are either #define or #undef. */ | |
452 | if (debug_info_level != DINFO_LEVEL_VERBOSE || gfc_peek_char () != '#') | |
453 | return 0; | |
454 | ||
455 | if (strncmp (gfc_current_locus.nextc, "#define ", 8) == 0) | |
456 | (*debug_hooks->define) (gfc_linebuf_linenum (gfc_current_locus.lb), | |
457 | &(gfc_current_locus.nextc[8])); | |
458 | ||
459 | if (strncmp (gfc_current_locus.nextc, "#undef ", 7) == 0) | |
460 | (*debug_hooks->undef) (gfc_linebuf_linenum (gfc_current_locus.lb), | |
461 | &(gfc_current_locus.nextc[7])); | |
462 | ||
463 | /* Skip the rest of the line. */ | |
464 | skip_comment_line (); | |
465 | ||
466 | return 1; | |
467 | } | |
468 | ||
469 | ||
6de9cd9a | 470 | /* Comment lines are null lines, lines containing only blanks or lines |
0d3abf6f JJ |
471 | on which the first nonblank line is a '!'. |
472 | Return true if !$ openmp conditional compilation sentinel was | |
473 | seen. */ | |
6de9cd9a | 474 | |
0d3abf6f | 475 | static bool |
6de9cd9a DN |
476 | skip_free_comments (void) |
477 | { | |
478 | locus start; | |
479 | char c; | |
6c7a4dfd | 480 | int at_bol; |
6de9cd9a DN |
481 | |
482 | for (;;) | |
483 | { | |
6c7a4dfd | 484 | at_bol = gfc_at_bol (); |
63645982 | 485 | start = gfc_current_locus; |
6de9cd9a DN |
486 | if (gfc_at_eof ()) |
487 | break; | |
488 | ||
489 | do | |
6c7a4dfd | 490 | c = next_char (); |
6de9cd9a DN |
491 | while (gfc_is_whitespace (c)); |
492 | ||
493 | if (c == '\n') | |
494 | { | |
495 | gfc_advance_line (); | |
496 | continue; | |
497 | } | |
498 | ||
499 | if (c == '!') | |
500 | { | |
6c7a4dfd JJ |
501 | /* If -fopenmp, we need to handle here 2 things: |
502 | 1) don't treat !$omp as comments, but directives | |
503 | 2) handle OpenMP conditional compilation, where | |
504 | !$ should be treated as 2 spaces (for initial lines | |
505 | only if followed by space). */ | |
506 | if (gfc_option.flag_openmp && at_bol) | |
507 | { | |
508 | locus old_loc = gfc_current_locus; | |
509 | if (next_char () == '$') | |
510 | { | |
511 | c = next_char (); | |
512 | if (c == 'o' || c == 'O') | |
513 | { | |
514 | if (((c = next_char ()) == 'm' || c == 'M') | |
9fa6cfec | 515 | && ((c = next_char ()) == 'p' || c == 'P')) |
6c7a4dfd | 516 | { |
9fa6cfec | 517 | if ((c = next_char ()) == ' ' || continue_flag) |
6c7a4dfd | 518 | { |
9fa6cfec TB |
519 | while (gfc_is_whitespace (c)) |
520 | c = next_char (); | |
521 | if (c != '\n' && c != '!') | |
522 | { | |
523 | openmp_flag = 1; | |
524 | openmp_locus = old_loc; | |
525 | gfc_current_locus = start; | |
526 | return false; | |
527 | } | |
6c7a4dfd | 528 | } |
9fa6cfec TB |
529 | else |
530 | gfc_warning_now ("!$OMP at %C starts a commented " | |
531 | "line as it neither is followed " | |
532 | "by a space nor is a " | |
533 | "continuation line"); | |
6c7a4dfd JJ |
534 | } |
535 | gfc_current_locus = old_loc; | |
536 | next_char (); | |
537 | c = next_char (); | |
538 | } | |
539 | if (continue_flag || c == ' ') | |
540 | { | |
541 | gfc_current_locus = old_loc; | |
542 | next_char (); | |
b30c6a0d | 543 | openmp_flag = 0; |
0d3abf6f | 544 | return true; |
6c7a4dfd JJ |
545 | } |
546 | } | |
547 | gfc_current_locus = old_loc; | |
548 | } | |
6de9cd9a DN |
549 | skip_comment_line (); |
550 | continue; | |
551 | } | |
552 | ||
553 | break; | |
554 | } | |
555 | ||
6c7a4dfd JJ |
556 | if (openmp_flag && at_bol) |
557 | openmp_flag = 0; | |
63645982 | 558 | gfc_current_locus = start; |
0d3abf6f | 559 | return false; |
6de9cd9a DN |
560 | } |
561 | ||
562 | ||
563 | /* Skip comment lines in fixed source mode. We have the same rules as | |
564 | in skip_free_comment(), except that we can have a 'c', 'C' or '*' | |
e0bcf78c TS |
565 | in column 1, and a '!' cannot be in column 6. Also, we deal with |
566 | lines with 'd' or 'D' in column 1, if the user requested this. */ | |
6de9cd9a DN |
567 | |
568 | static void | |
569 | skip_fixed_comments (void) | |
570 | { | |
571 | locus start; | |
572 | int col; | |
573 | char c; | |
574 | ||
6c7a4dfd JJ |
575 | if (! gfc_at_bol ()) |
576 | { | |
577 | start = gfc_current_locus; | |
578 | if (! gfc_at_eof ()) | |
579 | { | |
580 | do | |
581 | c = next_char (); | |
582 | while (gfc_is_whitespace (c)); | |
583 | ||
584 | if (c == '\n') | |
585 | gfc_advance_line (); | |
586 | else if (c == '!') | |
587 | skip_comment_line (); | |
588 | } | |
589 | ||
590 | if (! gfc_at_bol ()) | |
591 | { | |
592 | gfc_current_locus = start; | |
593 | return; | |
594 | } | |
595 | } | |
596 | ||
6de9cd9a DN |
597 | for (;;) |
598 | { | |
63645982 | 599 | start = gfc_current_locus; |
6de9cd9a DN |
600 | if (gfc_at_eof ()) |
601 | break; | |
602 | ||
603 | c = next_char (); | |
604 | if (c == '\n') | |
605 | { | |
606 | gfc_advance_line (); | |
607 | continue; | |
608 | } | |
609 | ||
610 | if (c == '!' || c == 'c' || c == 'C' || c == '*') | |
611 | { | |
6c7a4dfd JJ |
612 | /* If -fopenmp, we need to handle here 2 things: |
613 | 1) don't treat !$omp|c$omp|*$omp as comments, but directives | |
614 | 2) handle OpenMP conditional compilation, where | |
615 | !$|c$|*$ should be treated as 2 spaces if the characters | |
616 | in columns 3 to 6 are valid fixed form label columns | |
617 | characters. */ | |
f449022d JD |
618 | if (gfc_current_locus.lb != NULL |
619 | && continue_line < gfc_linebuf_linenum (gfc_current_locus.lb)) | |
620 | continue_line = gfc_linebuf_linenum (gfc_current_locus.lb); | |
621 | ||
6c7a4dfd JJ |
622 | if (gfc_option.flag_openmp) |
623 | { | |
624 | if (next_char () == '$') | |
625 | { | |
626 | c = next_char (); | |
627 | if (c == 'o' || c == 'O') | |
628 | { | |
629 | if (((c = next_char ()) == 'm' || c == 'M') | |
630 | && ((c = next_char ()) == 'p' || c == 'P')) | |
631 | { | |
632 | c = next_char (); | |
633 | if (c != '\n' | |
634 | && ((openmp_flag && continue_flag) | |
635 | || c == ' ' || c == '0')) | |
636 | { | |
637 | c = next_char (); | |
638 | while (gfc_is_whitespace (c)) | |
639 | c = next_char (); | |
640 | if (c != '\n' && c != '!') | |
641 | { | |
642 | /* Canonicalize to *$omp. */ | |
643 | *start.nextc = '*'; | |
644 | openmp_flag = 1; | |
645 | gfc_current_locus = start; | |
646 | return; | |
647 | } | |
648 | } | |
649 | } | |
650 | } | |
651 | else | |
652 | { | |
653 | int digit_seen = 0; | |
654 | ||
655 | for (col = 3; col < 6; col++, c = next_char ()) | |
656 | if (c == ' ') | |
657 | continue; | |
658 | else if (c < '0' || c > '9') | |
659 | break; | |
660 | else | |
661 | digit_seen = 1; | |
662 | ||
663 | if (col == 6 && c != '\n' | |
664 | && ((continue_flag && !digit_seen) | |
665 | || c == ' ' || c == '0')) | |
666 | { | |
667 | gfc_current_locus = start; | |
668 | start.nextc[0] = ' '; | |
669 | start.nextc[1] = ' '; | |
670 | continue; | |
671 | } | |
672 | } | |
673 | } | |
674 | gfc_current_locus = start; | |
675 | } | |
6de9cd9a DN |
676 | skip_comment_line (); |
677 | continue; | |
678 | } | |
679 | ||
e0bcf78c TS |
680 | if (gfc_option.flag_d_lines != -1 && (c == 'd' || c == 'D')) |
681 | { | |
682 | if (gfc_option.flag_d_lines == 0) | |
683 | { | |
684 | skip_comment_line (); | |
685 | continue; | |
686 | } | |
687 | else | |
688 | *start.nextc = c = ' '; | |
689 | } | |
690 | ||
6de9cd9a | 691 | col = 1; |
e0bcf78c TS |
692 | |
693 | while (gfc_is_whitespace (c)) | |
6de9cd9a DN |
694 | { |
695 | c = next_char (); | |
696 | col++; | |
697 | } | |
6de9cd9a DN |
698 | |
699 | if (c == '\n') | |
700 | { | |
701 | gfc_advance_line (); | |
702 | continue; | |
703 | } | |
704 | ||
705 | if (col != 6 && c == '!') | |
706 | { | |
f449022d JD |
707 | if (gfc_current_locus.lb != NULL |
708 | && continue_line < gfc_linebuf_linenum (gfc_current_locus.lb)) | |
709 | continue_line = gfc_linebuf_linenum (gfc_current_locus.lb); | |
6de9cd9a DN |
710 | skip_comment_line (); |
711 | continue; | |
712 | } | |
713 | ||
714 | break; | |
715 | } | |
716 | ||
6c7a4dfd | 717 | openmp_flag = 0; |
63645982 | 718 | gfc_current_locus = start; |
6de9cd9a DN |
719 | } |
720 | ||
721 | ||
6c7a4dfd | 722 | /* Skips the current line if it is a comment. */ |
6de9cd9a DN |
723 | |
724 | void | |
725 | gfc_skip_comments (void) | |
726 | { | |
6c7a4dfd | 727 | if (gfc_current_form == FORM_FREE) |
6de9cd9a DN |
728 | skip_free_comments (); |
729 | else | |
730 | skip_fixed_comments (); | |
731 | } | |
732 | ||
733 | ||
734 | /* Get the next character from the input, taking continuation lines | |
735 | and end-of-line comments into account. This implies that comment | |
736 | lines between continued lines must be eaten here. For higher-level | |
737 | subroutines, this flattens continued lines into a single logical | |
738 | line. The in_string flag denotes whether we're inside a character | |
739 | context or not. */ | |
740 | ||
741 | int | |
742 | gfc_next_char_literal (int in_string) | |
743 | { | |
744 | locus old_loc; | |
6c7a4dfd | 745 | int i, c, prev_openmp_flag; |
6de9cd9a DN |
746 | |
747 | continue_flag = 0; | |
748 | ||
749 | restart: | |
750 | c = next_char (); | |
751 | if (gfc_at_end ()) | |
5a06474c JD |
752 | { |
753 | continue_count = 0; | |
754 | return c; | |
755 | } | |
6de9cd9a | 756 | |
d4fa05b9 | 757 | if (gfc_current_form == FORM_FREE) |
6de9cd9a | 758 | { |
0d3abf6f JJ |
759 | bool openmp_cond_flag; |
760 | ||
6de9cd9a DN |
761 | if (!in_string && c == '!') |
762 | { | |
6c7a4dfd JJ |
763 | if (openmp_flag |
764 | && memcmp (&gfc_current_locus, &openmp_locus, | |
765 | sizeof (gfc_current_locus)) == 0) | |
766 | goto done; | |
767 | ||
6de9cd9a DN |
768 | /* This line can't be continued */ |
769 | do | |
770 | { | |
771 | c = next_char (); | |
772 | } | |
773 | while (c != '\n'); | |
774 | ||
a34938be RG |
775 | /* Avoid truncation warnings for comment ending lines. */ |
776 | gfc_current_locus.lb->truncated = 0; | |
777 | ||
6de9cd9a DN |
778 | goto done; |
779 | } | |
780 | ||
781 | if (c != '&') | |
782 | goto done; | |
783 | ||
784 | /* If the next nonblank character is a ! or \n, we've got a | |
6c7a4dfd | 785 | continuation line. */ |
63645982 | 786 | old_loc = gfc_current_locus; |
6de9cd9a DN |
787 | |
788 | c = next_char (); | |
789 | while (gfc_is_whitespace (c)) | |
790 | c = next_char (); | |
791 | ||
792 | /* Character constants to be continued cannot have commentary | |
6c7a4dfd | 793 | after the '&'. */ |
6de9cd9a DN |
794 | |
795 | if (in_string && c != '\n') | |
796 | { | |
63645982 | 797 | gfc_current_locus = old_loc; |
6de9cd9a DN |
798 | c = '&'; |
799 | goto done; | |
800 | } | |
801 | ||
802 | if (c != '!' && c != '\n') | |
803 | { | |
63645982 | 804 | gfc_current_locus = old_loc; |
6de9cd9a DN |
805 | c = '&'; |
806 | goto done; | |
807 | } | |
808 | ||
6c7a4dfd | 809 | prev_openmp_flag = openmp_flag; |
6de9cd9a DN |
810 | continue_flag = 1; |
811 | if (c == '!') | |
812 | skip_comment_line (); | |
813 | else | |
814 | gfc_advance_line (); | |
0267ffdc JD |
815 | |
816 | if (gfc_at_eof()) | |
817 | goto not_continuation; | |
6de9cd9a | 818 | |
5a06474c JD |
819 | /* We've got a continuation line. If we are on the very next line after |
820 | the last continuation, increment the continuation line count and | |
821 | check whether the limit has been exceeded. */ | |
5ffeb913 | 822 | if (gfc_linebuf_linenum (gfc_current_locus.lb) == continue_line + 1) |
5a06474c JD |
823 | { |
824 | if (++continue_count == gfc_option.max_continue_free) | |
825 | { | |
edf1eac2 SK |
826 | if (gfc_notification_std (GFC_STD_GNU) || pedantic) |
827 | gfc_warning ("Limit of %d continuations exceeded in " | |
828 | "statement at %C", gfc_option.max_continue_free); | |
5a06474c JD |
829 | } |
830 | } | |
5a06474c JD |
831 | |
832 | /* Now find where it continues. First eat any comment lines. */ | |
0d3abf6f | 833 | openmp_cond_flag = skip_free_comments (); |
6de9cd9a | 834 | |
f449022d JD |
835 | if (gfc_current_locus.lb != NULL |
836 | && continue_line < gfc_linebuf_linenum (gfc_current_locus.lb)) | |
837 | continue_line = gfc_linebuf_linenum (gfc_current_locus.lb); | |
838 | ||
6c7a4dfd JJ |
839 | if (prev_openmp_flag != openmp_flag) |
840 | { | |
841 | gfc_current_locus = old_loc; | |
842 | openmp_flag = prev_openmp_flag; | |
843 | c = '&'; | |
844 | goto done; | |
845 | } | |
846 | ||
6de9cd9a | 847 | /* Now that we have a non-comment line, probe ahead for the |
6c7a4dfd JJ |
848 | first non-whitespace character. If it is another '&', then |
849 | reading starts at the next character, otherwise we must back | |
850 | up to where the whitespace started and resume from there. */ | |
6de9cd9a | 851 | |
63645982 | 852 | old_loc = gfc_current_locus; |
6de9cd9a DN |
853 | |
854 | c = next_char (); | |
855 | while (gfc_is_whitespace (c)) | |
856 | c = next_char (); | |
857 | ||
6c7a4dfd JJ |
858 | if (openmp_flag) |
859 | { | |
860 | for (i = 0; i < 5; i++, c = next_char ()) | |
861 | { | |
862 | gcc_assert (TOLOWER (c) == "!$omp"[i]); | |
863 | if (i == 4) | |
864 | old_loc = gfc_current_locus; | |
865 | } | |
866 | while (gfc_is_whitespace (c)) | |
867 | c = next_char (); | |
868 | } | |
869 | ||
6de9cd9a | 870 | if (c != '&') |
3fbab549 | 871 | { |
5a06474c JD |
872 | if (in_string) |
873 | { | |
874 | if (gfc_option.warn_ampersand) | |
edf1eac2 SK |
875 | gfc_warning_now ("Missing '&' in continued character " |
876 | "constant at %C"); | |
5a06474c JD |
877 | gfc_current_locus.nextc--; |
878 | } | |
0d3abf6f JJ |
879 | /* Both !$omp and !$ -fopenmp continuation lines have & on the |
880 | continuation line only optionally. */ | |
881 | else if (openmp_flag || openmp_cond_flag) | |
882 | gfc_current_locus.nextc--; | |
5a06474c JD |
883 | else |
884 | { | |
885 | c = ' '; | |
886 | gfc_current_locus = old_loc; | |
887 | goto done; | |
888 | } | |
3fbab549 | 889 | } |
6de9cd9a DN |
890 | } |
891 | else | |
892 | { | |
893 | /* Fixed form continuation. */ | |
894 | if (!in_string && c == '!') | |
895 | { | |
896 | /* Skip comment at end of line. */ | |
897 | do | |
898 | { | |
899 | c = next_char (); | |
900 | } | |
901 | while (c != '\n'); | |
a34938be RG |
902 | |
903 | /* Avoid truncation warnings for comment ending lines. */ | |
904 | gfc_current_locus.lb->truncated = 0; | |
6de9cd9a DN |
905 | } |
906 | ||
907 | if (c != '\n') | |
908 | goto done; | |
909 | ||
6c7a4dfd | 910 | prev_openmp_flag = openmp_flag; |
6de9cd9a | 911 | continue_flag = 1; |
63645982 | 912 | old_loc = gfc_current_locus; |
6de9cd9a DN |
913 | |
914 | gfc_advance_line (); | |
0d3abf6f | 915 | skip_fixed_comments (); |
6de9cd9a DN |
916 | |
917 | /* See if this line is a continuation line. */ | |
6c7a4dfd | 918 | if (openmp_flag != prev_openmp_flag) |
6de9cd9a | 919 | { |
6c7a4dfd JJ |
920 | openmp_flag = prev_openmp_flag; |
921 | goto not_continuation; | |
6de9cd9a DN |
922 | } |
923 | ||
6c7a4dfd JJ |
924 | if (!openmp_flag) |
925 | for (i = 0; i < 5; i++) | |
926 | { | |
927 | c = next_char (); | |
928 | if (c != ' ') | |
929 | goto not_continuation; | |
930 | } | |
931 | else | |
932 | for (i = 0; i < 5; i++) | |
933 | { | |
934 | c = next_char (); | |
935 | if (TOLOWER (c) != "*$omp"[i]) | |
936 | goto not_continuation; | |
937 | } | |
938 | ||
6de9cd9a | 939 | c = next_char (); |
6c7a4dfd | 940 | if (c == '0' || c == ' ' || c == '\n') |
6de9cd9a | 941 | goto not_continuation; |
5a06474c JD |
942 | |
943 | /* We've got a continuation line. If we are on the very next line after | |
944 | the last continuation, increment the continuation line count and | |
945 | check whether the limit has been exceeded. */ | |
5ffeb913 | 946 | if (gfc_linebuf_linenum (gfc_current_locus.lb) == continue_line + 1) |
5a06474c JD |
947 | { |
948 | if (++continue_count == gfc_option.max_continue_fixed) | |
949 | { | |
edf1eac2 SK |
950 | if (gfc_notification_std (GFC_STD_GNU) || pedantic) |
951 | gfc_warning ("Limit of %d continuations exceeded in " | |
952 | "statement at %C", | |
953 | gfc_option.max_continue_fixed); | |
5a06474c JD |
954 | } |
955 | } | |
956 | ||
f449022d JD |
957 | if (gfc_current_locus.lb != NULL |
958 | && continue_line < gfc_linebuf_linenum (gfc_current_locus.lb)) | |
5ffeb913 | 959 | continue_line = gfc_linebuf_linenum (gfc_current_locus.lb); |
6de9cd9a DN |
960 | } |
961 | ||
962 | /* Ready to read first character of continuation line, which might | |
963 | be another continuation line! */ | |
964 | goto restart; | |
965 | ||
966 | not_continuation: | |
967 | c = '\n'; | |
63645982 | 968 | gfc_current_locus = old_loc; |
6de9cd9a DN |
969 | |
970 | done: | |
5a06474c JD |
971 | if (c == '\n') |
972 | continue_count = 0; | |
6de9cd9a DN |
973 | continue_flag = 0; |
974 | return c; | |
975 | } | |
976 | ||
977 | ||
978 | /* Get the next character of input, folded to lowercase. In fixed | |
979 | form mode, we also ignore spaces. When matcher subroutines are | |
980 | parsing character literals, they have to call | |
981 | gfc_next_char_literal(). */ | |
982 | ||
983 | int | |
984 | gfc_next_char (void) | |
985 | { | |
986 | int c; | |
987 | ||
988 | do | |
989 | { | |
990 | c = gfc_next_char_literal (0); | |
991 | } | |
d4fa05b9 | 992 | while (gfc_current_form == FORM_FIXED && gfc_is_whitespace (c)); |
6de9cd9a DN |
993 | |
994 | return TOLOWER (c); | |
995 | } | |
996 | ||
997 | ||
998 | int | |
999 | gfc_peek_char (void) | |
1000 | { | |
1001 | locus old_loc; | |
1002 | int c; | |
1003 | ||
63645982 | 1004 | old_loc = gfc_current_locus; |
6de9cd9a | 1005 | c = gfc_next_char (); |
63645982 | 1006 | gfc_current_locus = old_loc; |
6de9cd9a DN |
1007 | |
1008 | return c; | |
1009 | } | |
1010 | ||
1011 | ||
1012 | /* Recover from an error. We try to get past the current statement | |
1013 | and get lined up for the next. The next statement follows a '\n' | |
1014 | or a ';'. We also assume that we are not within a character | |
1015 | constant, and deal with finding a '\'' or '"'. */ | |
1016 | ||
1017 | void | |
1018 | gfc_error_recovery (void) | |
1019 | { | |
1020 | char c, delim; | |
1021 | ||
1022 | if (gfc_at_eof ()) | |
1023 | return; | |
1024 | ||
1025 | for (;;) | |
1026 | { | |
1027 | c = gfc_next_char (); | |
1028 | if (c == '\n' || c == ';') | |
1029 | break; | |
1030 | ||
1031 | if (c != '\'' && c != '"') | |
1032 | { | |
1033 | if (gfc_at_eof ()) | |
1034 | break; | |
1035 | continue; | |
1036 | } | |
1037 | delim = c; | |
1038 | ||
1039 | for (;;) | |
1040 | { | |
1041 | c = next_char (); | |
1042 | ||
1043 | if (c == delim) | |
1044 | break; | |
1045 | if (c == '\n') | |
ba1defa5 | 1046 | return; |
6de9cd9a DN |
1047 | if (c == '\\') |
1048 | { | |
1049 | c = next_char (); | |
1050 | if (c == '\n') | |
ba1defa5 | 1051 | return; |
6de9cd9a DN |
1052 | } |
1053 | } | |
1054 | if (gfc_at_eof ()) | |
1055 | break; | |
1056 | } | |
6de9cd9a DN |
1057 | } |
1058 | ||
1059 | ||
1060 | /* Read ahead until the next character to be read is not whitespace. */ | |
1061 | ||
1062 | void | |
1063 | gfc_gobble_whitespace (void) | |
1064 | { | |
840bd9f7 | 1065 | static int linenum = 0; |
6de9cd9a DN |
1066 | locus old_loc; |
1067 | int c; | |
1068 | ||
1069 | do | |
1070 | { | |
63645982 | 1071 | old_loc = gfc_current_locus; |
6de9cd9a | 1072 | c = gfc_next_char_literal (0); |
840bd9f7 SK |
1073 | /* Issue a warning for nonconforming tabs. We keep track of the line |
1074 | number because the Fortran matchers will often back up and the same | |
1075 | line will be scanned multiple times. */ | |
45a82bd9 | 1076 | if (!gfc_option.warn_tabs && c == '\t') |
840bd9f7 | 1077 | { |
45a82bd9 | 1078 | int cur_linenum = LOCATION_LINE (gfc_current_locus.lb->location); |
45a82bd9 PB |
1079 | if (cur_linenum != linenum) |
1080 | { | |
1081 | linenum = cur_linenum; | |
1082 | gfc_warning_now ("Nonconforming tab character at %C"); | |
1083 | } | |
840bd9f7 | 1084 | } |
6de9cd9a DN |
1085 | } |
1086 | while (gfc_is_whitespace (c)); | |
1087 | ||
63645982 | 1088 | gfc_current_locus = old_loc; |
6de9cd9a DN |
1089 | } |
1090 | ||
1091 | ||
f56c5d5d TS |
1092 | /* Load a single line into pbuf. |
1093 | ||
1094 | If pbuf points to a NULL pointer, it is allocated. | |
1095 | We truncate lines that are too long, unless we're dealing with | |
1096 | preprocessor lines or if the option -ffixed-line-length-none is set, | |
1097 | in which case we reallocate the buffer to fit the entire line, if | |
1098 | need be. | |
1099 | In fixed mode, we expand a tab that occurs within the statement | |
1100 | label region to expand to spaces that leave the next character in | |
ba1defa5 | 1101 | the source region. |
1526c4b5 JD |
1102 | load_line returns whether the line was truncated. |
1103 | ||
1104 | NOTE: The error machinery isn't available at this point, so we can't | |
1105 | easily report line and column numbers consistent with other | |
1106 | parts of gfortran. */ | |
6de9cd9a | 1107 | |
ba1defa5 | 1108 | static int |
edf1eac2 | 1109 | load_line (FILE *input, char **pbuf, int *pbuflen) |
6de9cd9a | 1110 | { |
840bd9f7 | 1111 | static int linenum = 0, current_line = 1; |
d1e3d6ae | 1112 | int c, maxlen, i, preprocessor_flag, buflen = *pbuflen; |
840bd9f7 | 1113 | int trunc_flag = 0, seen_comment = 0; |
1526c4b5 | 1114 | int seen_printable = 0, seen_ampersand = 0; |
f56c5d5d | 1115 | char *buffer; |
fd1935d5 | 1116 | bool found_tab = false; |
f56c5d5d | 1117 | |
1dde8683 | 1118 | /* Determine the maximum allowed line length. */ |
f56c5d5d | 1119 | if (gfc_current_form == FORM_FREE) |
1dde8683 | 1120 | maxlen = gfc_option.free_line_length; |
16ab8e74 | 1121 | else if (gfc_current_form == FORM_FIXED) |
1dde8683 | 1122 | maxlen = gfc_option.fixed_line_length; |
f56c5d5d | 1123 | else |
16ab8e74 | 1124 | maxlen = 72; |
f56c5d5d TS |
1125 | |
1126 | if (*pbuf == NULL) | |
1127 | { | |
1dde8683 BM |
1128 | /* Allocate the line buffer, storing its length into buflen. |
1129 | Note that if maxlen==0, indicating that arbitrary-length lines | |
1130 | are allowed, the buffer will be reallocated if this length is | |
1131 | insufficient; since 132 characters is the length of a standard | |
1132 | free-form line, we use that as a starting guess. */ | |
f56c5d5d TS |
1133 | if (maxlen > 0) |
1134 | buflen = maxlen; | |
1135 | else | |
1dde8683 | 1136 | buflen = 132; |
6de9cd9a | 1137 | |
f56c5d5d TS |
1138 | *pbuf = gfc_getmem (buflen + 1); |
1139 | } | |
6de9cd9a DN |
1140 | |
1141 | i = 0; | |
f56c5d5d | 1142 | buffer = *pbuf; |
6de9cd9a | 1143 | |
fa841200 | 1144 | preprocessor_flag = 0; |
c4da1827 | 1145 | c = getc (input); |
fa841200 | 1146 | if (c == '#') |
f56c5d5d TS |
1147 | /* In order to not truncate preprocessor lines, we have to |
1148 | remember that this is one. */ | |
fa841200 TS |
1149 | preprocessor_flag = 1; |
1150 | ungetc (c, input); | |
1151 | ||
6de9cd9a DN |
1152 | for (;;) |
1153 | { | |
c4da1827 | 1154 | c = getc (input); |
6de9cd9a DN |
1155 | |
1156 | if (c == EOF) | |
1157 | break; | |
1158 | if (c == '\n') | |
1526c4b5 JD |
1159 | { |
1160 | /* Check for illegal use of ampersand. See F95 Standard 3.3.1.3. */ | |
1161 | if (gfc_current_form == FORM_FREE | |
c284e499 | 1162 | && !seen_printable && seen_ampersand) |
1526c4b5 JD |
1163 | { |
1164 | if (pedantic) | |
edf1eac2 SK |
1165 | gfc_error_now ("'&' not allowed by itself in line %d", |
1166 | current_line); | |
1526c4b5 | 1167 | else |
edf1eac2 SK |
1168 | gfc_warning_now ("'&' not allowed by itself in line %d", |
1169 | current_line); | |
1526c4b5 JD |
1170 | } |
1171 | break; | |
1172 | } | |
6de9cd9a DN |
1173 | |
1174 | if (c == '\r') | |
d4fa05b9 | 1175 | continue; /* Gobble characters. */ |
6de9cd9a DN |
1176 | if (c == '\0') |
1177 | continue; | |
1178 | ||
1526c4b5 | 1179 | if (c == '&') |
1526c4b5 | 1180 | { |
c284e499 JD |
1181 | if (seen_ampersand) |
1182 | seen_ampersand = 0; | |
1526c4b5 | 1183 | else |
c284e499 | 1184 | seen_ampersand = 1; |
1526c4b5 JD |
1185 | } |
1186 | ||
bd5db9de | 1187 | if ((c != '&' && c != '!' && c != ' ') || (c == '!' && !seen_ampersand)) |
c284e499 JD |
1188 | seen_printable = 1; |
1189 | ||
840bd9f7 SK |
1190 | /* Is this a fixed-form comment? */ |
1191 | if (gfc_current_form == FORM_FIXED && i == 0 | |
1192 | && (c == '*' || c == 'c' || c == 'd')) | |
1193 | seen_comment = 1; | |
1194 | ||
fd1935d5 TB |
1195 | /* Vendor extension: "<tab>1" marks a continuation line. */ |
1196 | if (found_tab) | |
840bd9f7 | 1197 | { |
fd1935d5 TB |
1198 | found_tab = false; |
1199 | if (c >= '1' && c <= '9') | |
1200 | { | |
1201 | *(buffer-1) = c; | |
1202 | continue; | |
1203 | } | |
1204 | } | |
1205 | ||
1206 | if (gfc_current_form == FORM_FIXED && c == '\t' && i < 6) | |
1207 | { | |
1208 | found_tab = true; | |
1209 | ||
840bd9f7 SK |
1210 | if (!gfc_option.warn_tabs && seen_comment == 0 |
1211 | && current_line != linenum) | |
1212 | { | |
1213 | linenum = current_line; | |
fd1935d5 TB |
1214 | gfc_warning_now ("Nonconforming tab character in column %d " |
1215 | "of line %d", i+1, linenum); | |
840bd9f7 SK |
1216 | } |
1217 | ||
fd1935d5 | 1218 | while (i < 6) |
6de9cd9a DN |
1219 | { |
1220 | *buffer++ = ' '; | |
1221 | i++; | |
1222 | } | |
1223 | ||
1224 | continue; | |
1225 | } | |
1226 | ||
1227 | *buffer++ = c; | |
1228 | i++; | |
1229 | ||
d1e3d6ae | 1230 | if (maxlen == 0 || preprocessor_flag) |
f56c5d5d | 1231 | { |
d1e3d6ae JJ |
1232 | if (i >= buflen) |
1233 | { | |
1234 | /* Reallocate line buffer to double size to hold the | |
3fbab549 | 1235 | overlong line. */ |
d1e3d6ae JJ |
1236 | buflen = buflen * 2; |
1237 | *pbuf = xrealloc (*pbuf, buflen + 1); | |
edf1eac2 | 1238 | buffer = (*pbuf) + i; |
d1e3d6ae | 1239 | } |
f56c5d5d | 1240 | } |
d1e3d6ae | 1241 | else if (i >= maxlen) |
16ab8e74 | 1242 | { |
f56c5d5d | 1243 | /* Truncate the rest of the line. */ |
6de9cd9a DN |
1244 | for (;;) |
1245 | { | |
c4da1827 | 1246 | c = getc (input); |
6de9cd9a DN |
1247 | if (c == '\n' || c == EOF) |
1248 | break; | |
a34938be RG |
1249 | |
1250 | trunc_flag = 1; | |
6de9cd9a DN |
1251 | } |
1252 | ||
1253 | ungetc ('\n', input); | |
1254 | } | |
1255 | } | |
1256 | ||
f56c5d5d TS |
1257 | /* Pad lines to the selected line length in fixed form. */ |
1258 | if (gfc_current_form == FORM_FIXED | |
043c2d9e | 1259 | && gfc_option.fixed_line_length != 0 |
f56c5d5d TS |
1260 | && !preprocessor_flag |
1261 | && c != EOF) | |
043c2d9e BF |
1262 | { |
1263 | while (i++ < maxlen) | |
1264 | *buffer++ = ' '; | |
1265 | } | |
f56c5d5d | 1266 | |
6de9cd9a | 1267 | *buffer = '\0'; |
d1e3d6ae | 1268 | *pbuflen = buflen; |
840bd9f7 | 1269 | current_line++; |
ba1defa5 RG |
1270 | |
1271 | return trunc_flag; | |
6de9cd9a DN |
1272 | } |
1273 | ||
1274 | ||
d4fa05b9 TS |
1275 | /* Get a gfc_file structure, initialize it and add it to |
1276 | the file stack. */ | |
1277 | ||
1278 | static gfc_file * | |
e0bcf78c | 1279 | get_file (const char *name, enum lc_reason reason ATTRIBUTE_UNUSED) |
d4fa05b9 TS |
1280 | { |
1281 | gfc_file *f; | |
1282 | ||
1283 | f = gfc_getmem (sizeof (gfc_file)); | |
1284 | ||
1285 | f->filename = gfc_getmem (strlen (name) + 1); | |
1286 | strcpy (f->filename, name); | |
1287 | ||
1288 | f->next = file_head; | |
1289 | file_head = f; | |
1290 | ||
60332588 | 1291 | f->up = current_file; |
d4fa05b9 | 1292 | if (current_file != NULL) |
1b271c9b | 1293 | f->inclusion_line = current_file->line; |
d4fa05b9 | 1294 | |
5ffeb913 | 1295 | linemap_add (line_table, reason, false, f->filename, 1); |
c8cc8542 | 1296 | |
d4fa05b9 TS |
1297 | return f; |
1298 | } | |
1299 | ||
1300 | /* Deal with a line from the C preprocessor. The | |
1301 | initial octothorp has already been seen. */ | |
6de9cd9a DN |
1302 | |
1303 | static void | |
d4fa05b9 | 1304 | preprocessor_line (char *c) |
6de9cd9a | 1305 | { |
d4fa05b9 TS |
1306 | bool flag[5]; |
1307 | int i, line; | |
1308 | char *filename; | |
1309 | gfc_file *f; | |
2d7c7df6 | 1310 | int escaped, unescape; |
6de9cd9a | 1311 | |
d4fa05b9 TS |
1312 | c++; |
1313 | while (*c == ' ' || *c == '\t') | |
1314 | c++; | |
6de9cd9a | 1315 | |
d4fa05b9 | 1316 | if (*c < '0' || *c > '9') |
fa841200 | 1317 | goto bad_cpp_line; |
6de9cd9a | 1318 | |
d4fa05b9 TS |
1319 | line = atoi (c); |
1320 | ||
4c3a6ca1 | 1321 | c = strchr (c, ' '); |
fa841200 | 1322 | if (c == NULL) |
4c3a6ca1 JJ |
1323 | { |
1324 | /* No file name given. Set new line number. */ | |
1325 | current_file->line = line; | |
1326 | return; | |
1327 | } | |
d7d528c8 ES |
1328 | |
1329 | /* Skip spaces. */ | |
1330 | while (*c == ' ' || *c == '\t') | |
1331 | c++; | |
1332 | ||
1333 | /* Skip quote. */ | |
1334 | if (*c != '"') | |
fa841200 | 1335 | goto bad_cpp_line; |
d7d528c8 ES |
1336 | ++c; |
1337 | ||
d4fa05b9 TS |
1338 | filename = c; |
1339 | ||
d7d528c8 | 1340 | /* Make filename end at quote. */ |
2d7c7df6 | 1341 | unescape = 0; |
d7d528c8 | 1342 | escaped = false; |
edf1eac2 | 1343 | while (*c && ! (!escaped && *c == '"')) |
d7d528c8 ES |
1344 | { |
1345 | if (escaped) | |
edf1eac2 | 1346 | escaped = false; |
2d7c7df6 JJ |
1347 | else if (*c == '\\') |
1348 | { | |
1349 | escaped = true; | |
1350 | unescape++; | |
1351 | } | |
d7d528c8 ES |
1352 | ++c; |
1353 | } | |
1354 | ||
1355 | if (! *c) | |
fa841200 TS |
1356 | /* Preprocessor line has no closing quote. */ |
1357 | goto bad_cpp_line; | |
d7d528c8 | 1358 | |
d4fa05b9 TS |
1359 | *c++ = '\0'; |
1360 | ||
2d7c7df6 JJ |
1361 | /* Undo effects of cpp_quote_string. */ |
1362 | if (unescape) | |
1363 | { | |
1364 | char *s = filename; | |
1365 | char *d = gfc_getmem (c - filename - unescape); | |
d7d528c8 | 1366 | |
2d7c7df6 JJ |
1367 | filename = d; |
1368 | while (*s) | |
1369 | { | |
1370 | if (*s == '\\') | |
1371 | *d++ = *++s; | |
1372 | else | |
1373 | *d++ = *s; | |
1374 | s++; | |
1375 | } | |
1376 | *d = '\0'; | |
1377 | } | |
d7d528c8 | 1378 | |
d4fa05b9 | 1379 | /* Get flags. */ |
4c3a6ca1 | 1380 | |
1e39a151 | 1381 | flag[1] = flag[2] = flag[3] = flag[4] = false; |
6de9cd9a | 1382 | |
6de9cd9a DN |
1383 | for (;;) |
1384 | { | |
d4fa05b9 TS |
1385 | c = strchr (c, ' '); |
1386 | if (c == NULL) | |
1387 | break; | |
6de9cd9a | 1388 | |
d4fa05b9 TS |
1389 | c++; |
1390 | i = atoi (c); | |
6de9cd9a | 1391 | |
d4fa05b9 TS |
1392 | if (1 <= i && i <= 4) |
1393 | flag[i] = true; | |
1394 | } | |
4c3a6ca1 | 1395 | |
d4fa05b9 | 1396 | /* Interpret flags. */ |
4c3a6ca1 | 1397 | |
94b00ee4 | 1398 | if (flag[1]) /* Starting new file. */ |
d4fa05b9 | 1399 | { |
c8cc8542 | 1400 | f = get_file (filename, LC_RENAME); |
1b271c9b | 1401 | add_file_change (f->filename, f->inclusion_line); |
d4fa05b9 TS |
1402 | current_file = f; |
1403 | } | |
4c3a6ca1 | 1404 | |
d4fa05b9 TS |
1405 | if (flag[2]) /* Ending current file. */ |
1406 | { | |
94b00ee4 JJ |
1407 | if (!current_file->up |
1408 | || strcmp (current_file->up->filename, filename) != 0) | |
4c3a6ca1 JJ |
1409 | { |
1410 | gfc_warning_now ("%s:%d: file %s left but not entered", | |
1411 | current_file->filename, current_file->line, | |
1412 | filename); | |
2d7c7df6 JJ |
1413 | if (unescape) |
1414 | gfc_free (filename); | |
4c3a6ca1 JJ |
1415 | return; |
1416 | } | |
ee07457b | 1417 | |
1b271c9b | 1418 | add_file_change (NULL, line); |
94b00ee4 | 1419 | current_file = current_file->up; |
ee07457b FXC |
1420 | linemap_add (line_table, LC_RENAME, false, current_file->filename, |
1421 | current_file->line); | |
d4fa05b9 | 1422 | } |
4c3a6ca1 | 1423 | |
d4fa05b9 TS |
1424 | /* The name of the file can be a temporary file produced by |
1425 | cpp. Replace the name if it is different. */ | |
4c3a6ca1 | 1426 | |
d4fa05b9 TS |
1427 | if (strcmp (current_file->filename, filename) != 0) |
1428 | { | |
1429 | gfc_free (current_file->filename); | |
1430 | current_file->filename = gfc_getmem (strlen (filename) + 1); | |
1431 | strcpy (current_file->filename, filename); | |
1432 | } | |
fa841200 | 1433 | |
4c3a6ca1 JJ |
1434 | /* Set new line number. */ |
1435 | current_file->line = line; | |
2d7c7df6 JJ |
1436 | if (unescape) |
1437 | gfc_free (filename); | |
fa841200 TS |
1438 | return; |
1439 | ||
1440 | bad_cpp_line: | |
4c3a6ca1 | 1441 | gfc_warning_now ("%s:%d: Illegal preprocessor directive", |
fa841200 TS |
1442 | current_file->filename, current_file->line); |
1443 | current_file->line++; | |
d4fa05b9 TS |
1444 | } |
1445 | ||
1446 | ||
e0bcf78c | 1447 | static try load_file (const char *, bool); |
d4fa05b9 TS |
1448 | |
1449 | /* include_line()-- Checks a line buffer to see if it is an include | |
1450 | line. If so, we call load_file() recursively to load the included | |
1451 | file. We never return a syntax error because a statement like | |
1452 | "include = 5" is perfectly legal. We return false if no include was | |
1453 | processed or true if we matched an include. */ | |
1454 | ||
1455 | static bool | |
1456 | include_line (char *line) | |
1457 | { | |
1458 | char quote, *c, *begin, *stop; | |
9b9e4cd6 | 1459 | |
d4fa05b9 | 1460 | c = line; |
9b9e4cd6 JJ |
1461 | |
1462 | if (gfc_option.flag_openmp) | |
1463 | { | |
1464 | if (gfc_current_form == FORM_FREE) | |
1465 | { | |
1466 | while (*c == ' ' || *c == '\t') | |
1467 | c++; | |
1468 | if (*c == '!' && c[1] == '$' && (c[2] == ' ' || c[2] == '\t')) | |
1469 | c += 3; | |
1470 | } | |
1471 | else | |
1472 | { | |
1473 | if ((*c == '!' || *c == 'c' || *c == 'C' || *c == '*') | |
1474 | && c[1] == '$' && (c[2] == ' ' || c[2] == '\t')) | |
1475 | c += 3; | |
1476 | } | |
1477 | } | |
1478 | ||
d4fa05b9 TS |
1479 | while (*c == ' ' || *c == '\t') |
1480 | c++; | |
1481 | ||
1482 | if (strncasecmp (c, "include", 7)) | |
1483 | return false; | |
1484 | ||
1485 | c += 7; | |
1486 | while (*c == ' ' || *c == '\t') | |
1487 | c++; | |
1488 | ||
1489 | /* Find filename between quotes. */ | |
1490 | ||
1491 | quote = *c++; | |
1492 | if (quote != '"' && quote != '\'') | |
1493 | return false; | |
1494 | ||
1495 | begin = c; | |
1496 | ||
1497 | while (*c != quote && *c != '\0') | |
1498 | c++; | |
1499 | ||
1500 | if (*c == '\0') | |
1501 | return false; | |
1502 | ||
1503 | stop = c++; | |
1504 | ||
1505 | while (*c == ' ' || *c == '\t') | |
1506 | c++; | |
1507 | ||
1508 | if (*c != '\0' && *c != '!') | |
1509 | return false; | |
1510 | ||
f7b529fa | 1511 | /* We have an include line at this point. */ |
d4fa05b9 TS |
1512 | |
1513 | *stop = '\0'; /* It's ok to trash the buffer, as this line won't be | |
1514 | read by anything else. */ | |
1515 | ||
1516 | load_file (begin, false); | |
1517 | return true; | |
1518 | } | |
1519 | ||
edf1eac2 | 1520 | |
d4fa05b9 TS |
1521 | /* Load a file into memory by calling load_line until the file ends. */ |
1522 | ||
1523 | static try | |
e0bcf78c | 1524 | load_file (const char *filename, bool initial) |
d4fa05b9 | 1525 | { |
f56c5d5d | 1526 | char *line; |
d4fa05b9 TS |
1527 | gfc_linebuf *b; |
1528 | gfc_file *f; | |
1529 | FILE *input; | |
d1e3d6ae | 1530 | int len, line_len; |
caef7872 | 1531 | bool first_line; |
d4fa05b9 TS |
1532 | |
1533 | for (f = current_file; f; f = f->up) | |
1534 | if (strcmp (filename, f->filename) == 0) | |
1535 | { | |
1536 | gfc_error_now ("File '%s' is being included recursively", filename); | |
1537 | return FAILURE; | |
1538 | } | |
1539 | ||
1540 | if (initial) | |
1541 | { | |
2d7c7df6 JJ |
1542 | if (gfc_src_file) |
1543 | { | |
1544 | input = gfc_src_file; | |
1545 | gfc_src_file = NULL; | |
1546 | } | |
1547 | else | |
1548 | input = gfc_open_file (filename); | |
d4fa05b9 TS |
1549 | if (input == NULL) |
1550 | { | |
1551 | gfc_error_now ("Can't open file '%s'", filename); | |
1552 | return FAILURE; | |
1553 | } | |
1554 | } | |
1555 | else | |
1556 | { | |
31198773 | 1557 | input = gfc_open_included_file (filename, false, false); |
d4fa05b9 TS |
1558 | if (input == NULL) |
1559 | { | |
1560 | gfc_error_now ("Can't open included file '%s'", filename); | |
1561 | return FAILURE; | |
1562 | } | |
1563 | } | |
1564 | ||
1565 | /* Load the file. */ | |
1566 | ||
c8cc8542 | 1567 | f = get_file (filename, initial ? LC_RENAME : LC_ENTER); |
1b271c9b JJ |
1568 | if (!initial) |
1569 | add_file_change (f->filename, f->inclusion_line); | |
d4fa05b9 TS |
1570 | current_file = f; |
1571 | current_file->line = 1; | |
f56c5d5d | 1572 | line = NULL; |
d1e3d6ae | 1573 | line_len = 0; |
caef7872 | 1574 | first_line = true; |
d4fa05b9 | 1575 | |
2d7c7df6 JJ |
1576 | if (initial && gfc_src_preprocessor_lines[0]) |
1577 | { | |
1578 | preprocessor_line (gfc_src_preprocessor_lines[0]); | |
1579 | gfc_free (gfc_src_preprocessor_lines[0]); | |
1580 | gfc_src_preprocessor_lines[0] = NULL; | |
1581 | if (gfc_src_preprocessor_lines[1]) | |
1582 | { | |
1583 | preprocessor_line (gfc_src_preprocessor_lines[1]); | |
1584 | gfc_free (gfc_src_preprocessor_lines[1]); | |
1585 | gfc_src_preprocessor_lines[1] = NULL; | |
1586 | } | |
1587 | } | |
1588 | ||
16ab8e74 | 1589 | for (;;) |
d4fa05b9 | 1590 | { |
d1e3d6ae | 1591 | int trunc = load_line (input, &line, &line_len); |
d4fa05b9 TS |
1592 | |
1593 | len = strlen (line); | |
6de9cd9a DN |
1594 | if (feof (input) && len == 0) |
1595 | break; | |
1596 | ||
caef7872 FXC |
1597 | /* If this is the first line of the file, it can contain a byte |
1598 | order mark (BOM), which we will ignore: | |
1599 | FF FE is UTF-16 little endian, | |
1600 | FE FF is UTF-16 big endian, | |
1601 | EF BB BF is UTF-8. */ | |
1602 | if (first_line | |
1603 | && ((line_len >= 2 && line[0] == '\xFF' && line[1] == '\xFE') | |
1604 | || (line_len >= 2 && line[0] == '\xFE' && line[1] == '\xFF') | |
1605 | || (line_len >= 3 && line[0] == '\xEF' && line[1] == '\xBB' | |
1606 | && line[2] == '\xBF'))) | |
1607 | { | |
1608 | int n = line[1] == '\xBB' ? 3 : 2; | |
1609 | char * new = gfc_getmem (line_len); | |
1610 | ||
1611 | strcpy (new, line + n); | |
1612 | gfc_free (line); | |
1613 | line = new; | |
1614 | len -= n; | |
1615 | } | |
1616 | ||
d4fa05b9 TS |
1617 | /* There are three things this line can be: a line of Fortran |
1618 | source, an include line or a C preprocessor directive. */ | |
6de9cd9a | 1619 | |
d4fa05b9 TS |
1620 | if (line[0] == '#') |
1621 | { | |
9e8a6720 FXC |
1622 | /* When -g3 is specified, it's possible that we emit #define |
1623 | and #undef lines, which we need to pass to the middle-end | |
1624 | so that it can emit correct debug info. */ | |
1625 | if (debug_info_level == DINFO_LEVEL_VERBOSE | |
1626 | && (strncmp (line, "#define ", 8) == 0 | |
1627 | || strncmp (line, "#undef ", 7) == 0)) | |
1628 | ; | |
1629 | else | |
1630 | { | |
1631 | preprocessor_line (line); | |
1632 | continue; | |
1633 | } | |
d4fa05b9 | 1634 | } |
6de9cd9a | 1635 | |
caef7872 FXC |
1636 | /* Preprocessed files have preprocessor lines added before the byte |
1637 | order mark, so first_line is not about the first line of the file | |
1638 | but the first line that's not a preprocessor line. */ | |
1639 | first_line = false; | |
1640 | ||
d4fa05b9 TS |
1641 | if (include_line (line)) |
1642 | { | |
1643 | current_file->line++; | |
1644 | continue; | |
6de9cd9a DN |
1645 | } |
1646 | ||
d4fa05b9 TS |
1647 | /* Add line. */ |
1648 | ||
4cdf7223 | 1649 | b = gfc_getmem (gfc_linebuf_header_size + len + 1); |
d4fa05b9 | 1650 | |
c8cc8542 | 1651 | b->location |
5ffeb913 | 1652 | = linemap_line_start (line_table, current_file->line++, 120); |
d4fa05b9 | 1653 | b->file = current_file; |
ba1defa5 | 1654 | b->truncated = trunc; |
d4fa05b9 TS |
1655 | strcpy (b->line, line); |
1656 | ||
1657 | if (line_head == NULL) | |
1658 | line_head = b; | |
1659 | else | |
1660 | line_tail->next = b; | |
1661 | ||
1662 | line_tail = b; | |
1b271c9b JJ |
1663 | |
1664 | while (file_changes_cur < file_changes_count) | |
1665 | file_changes[file_changes_cur++].lb = b; | |
6de9cd9a | 1666 | } |
d4fa05b9 | 1667 | |
f56c5d5d TS |
1668 | /* Release the line buffer allocated in load_line. */ |
1669 | gfc_free (line); | |
1670 | ||
d4fa05b9 TS |
1671 | fclose (input); |
1672 | ||
1b271c9b JJ |
1673 | if (!initial) |
1674 | add_file_change (NULL, current_file->inclusion_line + 1); | |
d4fa05b9 | 1675 | current_file = current_file->up; |
5ffeb913 | 1676 | linemap_add (line_table, LC_LEAVE, 0, NULL, 0); |
d4fa05b9 | 1677 | return SUCCESS; |
6de9cd9a DN |
1678 | } |
1679 | ||
1680 | ||
d4fa05b9 TS |
1681 | /* Open a new file and start scanning from that file. Returns SUCCESS |
1682 | if everything went OK, FAILURE otherwise. If form == FORM_UKNOWN | |
1683 | it tries to determine the source form from the filename, defaulting | |
1684 | to free form. */ | |
6de9cd9a DN |
1685 | |
1686 | try | |
e0bcf78c | 1687 | gfc_new_file (void) |
6de9cd9a | 1688 | { |
d4fa05b9 | 1689 | try result; |
6de9cd9a | 1690 | |
d4fa05b9 | 1691 | result = load_file (gfc_source_file, true); |
6de9cd9a | 1692 | |
63645982 TS |
1693 | gfc_current_locus.lb = line_head; |
1694 | gfc_current_locus.nextc = (line_head == NULL) ? NULL : line_head->line; | |
6de9cd9a | 1695 | |
d4fa05b9 TS |
1696 | #if 0 /* Debugging aid. */ |
1697 | for (; line_head; line_head = line_head->next) | |
6c1abb5c FXC |
1698 | printf ("%s:%3d %s\n", LOCATION_FILE (line_head->location), |
1699 | LOCATION_LINE (line_head->location), line_head->line); | |
6de9cd9a | 1700 | |
d4fa05b9 TS |
1701 | exit (0); |
1702 | #endif | |
6de9cd9a | 1703 | |
d4fa05b9 | 1704 | return result; |
6de9cd9a | 1705 | } |
2d7c7df6 JJ |
1706 | |
1707 | static char * | |
1708 | unescape_filename (const char *ptr) | |
1709 | { | |
1710 | const char *p = ptr, *s; | |
1711 | char *d, *ret; | |
1712 | int escaped, unescape = 0; | |
1713 | ||
1714 | /* Make filename end at quote. */ | |
1715 | escaped = false; | |
1716 | while (*p && ! (! escaped && *p == '"')) | |
1717 | { | |
1718 | if (escaped) | |
1719 | escaped = false; | |
1720 | else if (*p == '\\') | |
1721 | { | |
1722 | escaped = true; | |
1723 | unescape++; | |
1724 | } | |
1725 | ++p; | |
1726 | } | |
1727 | ||
edf1eac2 | 1728 | if (!*p || p[1]) |
2d7c7df6 JJ |
1729 | return NULL; |
1730 | ||
1731 | /* Undo effects of cpp_quote_string. */ | |
1732 | s = ptr; | |
1733 | d = gfc_getmem (p + 1 - ptr - unescape); | |
1734 | ret = d; | |
1735 | ||
1736 | while (s != p) | |
1737 | { | |
1738 | if (*s == '\\') | |
1739 | *d++ = *++s; | |
1740 | else | |
1741 | *d++ = *s; | |
1742 | s++; | |
1743 | } | |
1744 | *d = '\0'; | |
1745 | return ret; | |
1746 | } | |
1747 | ||
1748 | /* For preprocessed files, if the first tokens are of the form # NUM. | |
1749 | handle the directives so we know the original file name. */ | |
1750 | ||
1751 | const char * | |
1752 | gfc_read_orig_filename (const char *filename, const char **canon_source_file) | |
1753 | { | |
1754 | int c, len; | |
1755 | char *dirname; | |
1756 | ||
1757 | gfc_src_file = gfc_open_file (filename); | |
1758 | if (gfc_src_file == NULL) | |
1759 | return NULL; | |
1760 | ||
c4da1827 | 1761 | c = getc (gfc_src_file); |
2d7c7df6 JJ |
1762 | ungetc (c, gfc_src_file); |
1763 | ||
1764 | if (c != '#') | |
1765 | return NULL; | |
1766 | ||
1767 | len = 0; | |
1768 | load_line (gfc_src_file, &gfc_src_preprocessor_lines[0], &len); | |
1769 | ||
1770 | if (strncmp (gfc_src_preprocessor_lines[0], "# 1 \"", 5) != 0) | |
1771 | return NULL; | |
1772 | ||
1773 | filename = unescape_filename (gfc_src_preprocessor_lines[0] + 5); | |
1774 | if (filename == NULL) | |
1775 | return NULL; | |
1776 | ||
c4da1827 | 1777 | c = getc (gfc_src_file); |
2d7c7df6 JJ |
1778 | ungetc (c, gfc_src_file); |
1779 | ||
1780 | if (c != '#') | |
1781 | return filename; | |
1782 | ||
1783 | len = 0; | |
1784 | load_line (gfc_src_file, &gfc_src_preprocessor_lines[1], &len); | |
1785 | ||
1786 | if (strncmp (gfc_src_preprocessor_lines[1], "# 1 \"", 5) != 0) | |
1787 | return filename; | |
1788 | ||
1789 | dirname = unescape_filename (gfc_src_preprocessor_lines[1] + 5); | |
1790 | if (dirname == NULL) | |
1791 | return filename; | |
1792 | ||
1793 | len = strlen (dirname); | |
1794 | if (len < 3 || dirname[len - 1] != '/' || dirname[len - 2] != '/') | |
1795 | { | |
1796 | gfc_free (dirname); | |
1797 | return filename; | |
1798 | } | |
1799 | dirname[len - 2] = '\0'; | |
1800 | set_src_pwd (dirname); | |
1801 | ||
1802 | if (! IS_ABSOLUTE_PATH (filename)) | |
1803 | { | |
1804 | char *p = gfc_getmem (len + strlen (filename)); | |
1805 | ||
1806 | memcpy (p, dirname, len - 2); | |
1807 | p[len - 2] = '/'; | |
1808 | strcpy (p + len - 1, filename); | |
1809 | *canon_source_file = p; | |
1810 | } | |
1811 | ||
1812 | gfc_free (dirname); | |
1813 | return filename; | |
1814 | } |