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6de9cd9a | 1 | /* Character scanner. |
6c7a4dfd | 2 | Copyright (C) 2000, 2001, 2002, 2003, 2004, 2005, 2006 |
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 | |
10 | Software Foundation; either version 2, or (at your option) any later | |
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 | |
9fc4d79b | 19 | along with GCC; see the file COPYING. If not, write to the Free |
ab57747b KC |
20 | Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA |
21 | 02110-1301, USA. */ | |
6de9cd9a DN |
22 | |
23 | /* Set of subroutines to (ultimately) return the next character to the | |
24 | various matching subroutines. This file's job is to read files and | |
25 | build up lines that are parsed by the parser. This means that we | |
26 | handle continuation lines and "include" lines. | |
27 | ||
28 | The first thing the scanner does is to load an entire file into | |
29 | memory. We load the entire file into memory for a couple reasons. | |
30 | The first is that we want to be able to deal with nonseekable input | |
31 | (pipes, stdin) and there is a lot of backing up involved during | |
32 | parsing. | |
33 | ||
34 | The second is that we want to be able to print the locus of errors, | |
35 | and an error on line 999999 could conflict with something on line | |
36 | one. Given nonseekable input, we've got to store the whole thing. | |
37 | ||
38 | One thing that helps are the column truncation limits that give us | |
39 | an upper bound on the size of individual lines. We don't store the | |
40 | truncated stuff. | |
41 | ||
42 | From the scanner's viewpoint, the higher level subroutines ask for | |
43 | new characters and do a lot of jumping backwards. */ | |
44 | ||
45 | #include "config.h" | |
d22e4895 | 46 | #include "system.h" |
6de9cd9a | 47 | #include "gfortran.h" |
2d7c7df6 | 48 | #include "toplev.h" |
6de9cd9a DN |
49 | |
50 | /* Structure for holding module and include file search path. */ | |
51 | typedef struct gfc_directorylist | |
52 | { | |
53 | char *path; | |
54 | struct gfc_directorylist *next; | |
55 | } | |
56 | gfc_directorylist; | |
57 | ||
58 | /* List of include file search directories. */ | |
59 | static gfc_directorylist *include_dirs; | |
60 | ||
d4fa05b9 | 61 | static gfc_file *file_head, *current_file; |
6de9cd9a | 62 | |
6c7a4dfd JJ |
63 | static int continue_flag, end_flag, openmp_flag; |
64 | static locus openmp_locus; | |
6de9cd9a | 65 | |
d4fa05b9 TS |
66 | gfc_source_form gfc_current_form; |
67 | static gfc_linebuf *line_head, *line_tail; | |
68 | ||
63645982 | 69 | locus gfc_current_locus; |
e0bcf78c | 70 | const char *gfc_source_file; |
2d7c7df6 JJ |
71 | static FILE *gfc_src_file; |
72 | static char *gfc_src_preprocessor_lines[2]; | |
73 | ||
6de9cd9a DN |
74 | |
75 | /* Main scanner initialization. */ | |
76 | ||
77 | void | |
78 | gfc_scanner_init_1 (void) | |
79 | { | |
d4fa05b9 TS |
80 | file_head = NULL; |
81 | line_head = NULL; | |
82 | line_tail = NULL; | |
6de9cd9a | 83 | |
6de9cd9a DN |
84 | end_flag = 0; |
85 | } | |
86 | ||
87 | ||
88 | /* Main scanner destructor. */ | |
89 | ||
90 | void | |
91 | gfc_scanner_done_1 (void) | |
92 | { | |
d4fa05b9 TS |
93 | gfc_linebuf *lb; |
94 | gfc_file *f; | |
6de9cd9a | 95 | |
d4fa05b9 | 96 | while(line_head != NULL) |
6de9cd9a | 97 | { |
d4fa05b9 TS |
98 | lb = line_head->next; |
99 | gfc_free(line_head); | |
100 | line_head = lb; | |
6de9cd9a | 101 | } |
d4fa05b9 TS |
102 | |
103 | while(file_head != NULL) | |
6de9cd9a | 104 | { |
d4fa05b9 TS |
105 | f = file_head->next; |
106 | gfc_free(file_head->filename); | |
107 | gfc_free(file_head); | |
108 | file_head = f; | |
6de9cd9a | 109 | } |
d4fa05b9 | 110 | |
6de9cd9a DN |
111 | } |
112 | ||
113 | ||
114 | /* Adds path to the list pointed to by list. */ | |
115 | ||
116 | void | |
117 | gfc_add_include_path (const char *path) | |
118 | { | |
119 | gfc_directorylist *dir; | |
120 | const char *p; | |
121 | ||
122 | p = path; | |
123 | while (*p == ' ' || *p == '\t') /* someone might do 'gfortran "-I include"' */ | |
124 | if (*p++ == '\0') | |
125 | return; | |
126 | ||
127 | dir = include_dirs; | |
128 | if (!dir) | |
129 | { | |
130 | dir = include_dirs = gfc_getmem (sizeof (gfc_directorylist)); | |
131 | } | |
132 | else | |
133 | { | |
134 | while (dir->next) | |
135 | dir = dir->next; | |
136 | ||
137 | dir->next = gfc_getmem (sizeof (gfc_directorylist)); | |
138 | dir = dir->next; | |
139 | } | |
140 | ||
141 | dir->next = NULL; | |
142 | dir->path = gfc_getmem (strlen (p) + 2); | |
143 | strcpy (dir->path, p); | |
144 | strcat (dir->path, "/"); /* make '/' last character */ | |
145 | } | |
146 | ||
147 | ||
148 | /* Release resources allocated for options. */ | |
149 | ||
150 | void | |
151 | gfc_release_include_path (void) | |
152 | { | |
153 | gfc_directorylist *p; | |
154 | ||
155 | gfc_free (gfc_option.module_dir); | |
156 | while (include_dirs != NULL) | |
157 | { | |
158 | p = include_dirs; | |
159 | include_dirs = include_dirs->next; | |
160 | gfc_free (p->path); | |
161 | gfc_free (p); | |
162 | } | |
163 | } | |
164 | ||
6de9cd9a | 165 | /* Opens file for reading, searching through the include directories |
b424a572 FXC |
166 | given if necessary. If the include_cwd argument is true, we try |
167 | to open the file in the current directory first. */ | |
6de9cd9a DN |
168 | |
169 | FILE * | |
b424a572 | 170 | gfc_open_included_file (const char *name, const bool include_cwd) |
6de9cd9a | 171 | { |
200cfbe7 | 172 | char *fullname; |
6de9cd9a DN |
173 | gfc_directorylist *p; |
174 | FILE *f; | |
175 | ||
b424a572 FXC |
176 | if (include_cwd) |
177 | { | |
178 | f = gfc_open_file (name); | |
179 | if (f != NULL) | |
180 | return f; | |
181 | } | |
6de9cd9a DN |
182 | |
183 | for (p = include_dirs; p; p = p->next) | |
184 | { | |
200cfbe7 | 185 | fullname = (char *) alloca(strlen (p->path) + strlen (name) + 1); |
6de9cd9a DN |
186 | strcpy (fullname, p->path); |
187 | strcat (fullname, name); | |
188 | ||
189 | f = gfc_open_file (fullname); | |
190 | if (f != NULL) | |
191 | return f; | |
192 | } | |
193 | ||
194 | return NULL; | |
195 | } | |
196 | ||
6de9cd9a DN |
197 | /* Test to see if we're at the end of the main source file. */ |
198 | ||
199 | int | |
200 | gfc_at_end (void) | |
201 | { | |
202 | ||
203 | return end_flag; | |
204 | } | |
205 | ||
206 | ||
207 | /* Test to see if we're at the end of the current file. */ | |
208 | ||
209 | int | |
210 | gfc_at_eof (void) | |
211 | { | |
212 | ||
213 | if (gfc_at_end ()) | |
214 | return 1; | |
215 | ||
d4fa05b9 | 216 | if (line_head == NULL) |
6de9cd9a DN |
217 | return 1; /* Null file */ |
218 | ||
63645982 | 219 | if (gfc_current_locus.lb == NULL) |
6de9cd9a DN |
220 | return 1; |
221 | ||
222 | return 0; | |
223 | } | |
224 | ||
225 | ||
226 | /* Test to see if we're at the beginning of a new line. */ | |
227 | ||
228 | int | |
229 | gfc_at_bol (void) | |
230 | { | |
6de9cd9a DN |
231 | if (gfc_at_eof ()) |
232 | return 1; | |
233 | ||
63645982 | 234 | return (gfc_current_locus.nextc == gfc_current_locus.lb->line); |
6de9cd9a DN |
235 | } |
236 | ||
237 | ||
238 | /* Test to see if we're at the end of a line. */ | |
239 | ||
240 | int | |
241 | gfc_at_eol (void) | |
242 | { | |
243 | ||
244 | if (gfc_at_eof ()) | |
245 | return 1; | |
246 | ||
63645982 | 247 | return (*gfc_current_locus.nextc == '\0'); |
6de9cd9a DN |
248 | } |
249 | ||
250 | ||
251 | /* Advance the current line pointer to the next line. */ | |
252 | ||
253 | void | |
254 | gfc_advance_line (void) | |
255 | { | |
6de9cd9a DN |
256 | if (gfc_at_end ()) |
257 | return; | |
258 | ||
63645982 | 259 | if (gfc_current_locus.lb == NULL) |
6de9cd9a | 260 | { |
d4fa05b9 TS |
261 | end_flag = 1; |
262 | return; | |
263 | } | |
6de9cd9a | 264 | |
63645982 | 265 | gfc_current_locus.lb = gfc_current_locus.lb->next; |
6de9cd9a | 266 | |
63645982 TS |
267 | if (gfc_current_locus.lb != NULL) |
268 | gfc_current_locus.nextc = gfc_current_locus.lb->line; | |
d4fa05b9 TS |
269 | else |
270 | { | |
63645982 | 271 | gfc_current_locus.nextc = NULL; |
d4fa05b9 TS |
272 | end_flag = 1; |
273 | } | |
6de9cd9a DN |
274 | } |
275 | ||
276 | ||
277 | /* Get the next character from the input, advancing gfc_current_file's | |
278 | locus. When we hit the end of the line or the end of the file, we | |
279 | start returning a '\n' in order to complete the current statement. | |
280 | No Fortran line conventions are implemented here. | |
281 | ||
282 | Requiring explicit advances to the next line prevents the parse | |
283 | pointer from being on the wrong line if the current statement ends | |
284 | prematurely. */ | |
285 | ||
286 | static int | |
287 | next_char (void) | |
288 | { | |
6de9cd9a | 289 | int c; |
d4fa05b9 | 290 | |
63645982 | 291 | if (gfc_current_locus.nextc == NULL) |
6de9cd9a DN |
292 | return '\n'; |
293 | ||
63645982 | 294 | c = *gfc_current_locus.nextc++; |
6de9cd9a DN |
295 | if (c == '\0') |
296 | { | |
63645982 | 297 | gfc_current_locus.nextc--; /* Remain on this line. */ |
6de9cd9a DN |
298 | c = '\n'; |
299 | } | |
300 | ||
301 | return c; | |
302 | } | |
303 | ||
6de9cd9a DN |
304 | /* Skip a comment. When we come here the parse pointer is positioned |
305 | immediately after the comment character. If we ever implement | |
306 | compiler directives withing comments, here is where we parse the | |
307 | directive. */ | |
308 | ||
309 | static void | |
310 | skip_comment_line (void) | |
311 | { | |
312 | char c; | |
313 | ||
314 | do | |
315 | { | |
316 | c = next_char (); | |
317 | } | |
318 | while (c != '\n'); | |
319 | ||
320 | gfc_advance_line (); | |
321 | } | |
322 | ||
323 | ||
324 | /* Comment lines are null lines, lines containing only blanks or lines | |
325 | on which the first nonblank line is a '!'. */ | |
326 | ||
327 | static void | |
328 | skip_free_comments (void) | |
329 | { | |
330 | locus start; | |
331 | char c; | |
6c7a4dfd | 332 | int at_bol; |
6de9cd9a DN |
333 | |
334 | for (;;) | |
335 | { | |
6c7a4dfd | 336 | at_bol = gfc_at_bol (); |
63645982 | 337 | start = gfc_current_locus; |
6de9cd9a DN |
338 | if (gfc_at_eof ()) |
339 | break; | |
340 | ||
341 | do | |
6c7a4dfd | 342 | c = next_char (); |
6de9cd9a DN |
343 | while (gfc_is_whitespace (c)); |
344 | ||
345 | if (c == '\n') | |
346 | { | |
347 | gfc_advance_line (); | |
348 | continue; | |
349 | } | |
350 | ||
351 | if (c == '!') | |
352 | { | |
6c7a4dfd JJ |
353 | /* If -fopenmp, we need to handle here 2 things: |
354 | 1) don't treat !$omp as comments, but directives | |
355 | 2) handle OpenMP conditional compilation, where | |
356 | !$ should be treated as 2 spaces (for initial lines | |
357 | only if followed by space). */ | |
358 | if (gfc_option.flag_openmp && at_bol) | |
359 | { | |
360 | locus old_loc = gfc_current_locus; | |
361 | if (next_char () == '$') | |
362 | { | |
363 | c = next_char (); | |
364 | if (c == 'o' || c == 'O') | |
365 | { | |
366 | if (((c = next_char ()) == 'm' || c == 'M') | |
367 | && ((c = next_char ()) == 'p' || c == 'P') | |
368 | && ((c = next_char ()) == ' ' || continue_flag)) | |
369 | { | |
370 | while (gfc_is_whitespace (c)) | |
371 | c = next_char (); | |
372 | if (c != '\n' && c != '!') | |
373 | { | |
374 | openmp_flag = 1; | |
375 | openmp_locus = old_loc; | |
376 | gfc_current_locus = start; | |
377 | return; | |
378 | } | |
379 | } | |
380 | gfc_current_locus = old_loc; | |
381 | next_char (); | |
382 | c = next_char (); | |
383 | } | |
384 | if (continue_flag || c == ' ') | |
385 | { | |
386 | gfc_current_locus = old_loc; | |
387 | next_char (); | |
388 | return; | |
389 | } | |
390 | } | |
391 | gfc_current_locus = old_loc; | |
392 | } | |
6de9cd9a DN |
393 | skip_comment_line (); |
394 | continue; | |
395 | } | |
396 | ||
397 | break; | |
398 | } | |
399 | ||
6c7a4dfd JJ |
400 | if (openmp_flag && at_bol) |
401 | openmp_flag = 0; | |
63645982 | 402 | gfc_current_locus = start; |
6de9cd9a DN |
403 | } |
404 | ||
405 | ||
406 | /* Skip comment lines in fixed source mode. We have the same rules as | |
407 | in skip_free_comment(), except that we can have a 'c', 'C' or '*' | |
e0bcf78c TS |
408 | in column 1, and a '!' cannot be in column 6. Also, we deal with |
409 | lines with 'd' or 'D' in column 1, if the user requested this. */ | |
6de9cd9a DN |
410 | |
411 | static void | |
412 | skip_fixed_comments (void) | |
413 | { | |
414 | locus start; | |
415 | int col; | |
416 | char c; | |
417 | ||
6c7a4dfd JJ |
418 | if (! gfc_at_bol ()) |
419 | { | |
420 | start = gfc_current_locus; | |
421 | if (! gfc_at_eof ()) | |
422 | { | |
423 | do | |
424 | c = next_char (); | |
425 | while (gfc_is_whitespace (c)); | |
426 | ||
427 | if (c == '\n') | |
428 | gfc_advance_line (); | |
429 | else if (c == '!') | |
430 | skip_comment_line (); | |
431 | } | |
432 | ||
433 | if (! gfc_at_bol ()) | |
434 | { | |
435 | gfc_current_locus = start; | |
436 | return; | |
437 | } | |
438 | } | |
439 | ||
6de9cd9a DN |
440 | for (;;) |
441 | { | |
63645982 | 442 | start = gfc_current_locus; |
6de9cd9a DN |
443 | if (gfc_at_eof ()) |
444 | break; | |
445 | ||
446 | c = next_char (); | |
447 | if (c == '\n') | |
448 | { | |
449 | gfc_advance_line (); | |
450 | continue; | |
451 | } | |
452 | ||
453 | if (c == '!' || c == 'c' || c == 'C' || c == '*') | |
454 | { | |
6c7a4dfd JJ |
455 | /* If -fopenmp, we need to handle here 2 things: |
456 | 1) don't treat !$omp|c$omp|*$omp as comments, but directives | |
457 | 2) handle OpenMP conditional compilation, where | |
458 | !$|c$|*$ should be treated as 2 spaces if the characters | |
459 | in columns 3 to 6 are valid fixed form label columns | |
460 | characters. */ | |
461 | if (gfc_option.flag_openmp) | |
462 | { | |
463 | if (next_char () == '$') | |
464 | { | |
465 | c = next_char (); | |
466 | if (c == 'o' || c == 'O') | |
467 | { | |
468 | if (((c = next_char ()) == 'm' || c == 'M') | |
469 | && ((c = next_char ()) == 'p' || c == 'P')) | |
470 | { | |
471 | c = next_char (); | |
472 | if (c != '\n' | |
473 | && ((openmp_flag && continue_flag) | |
474 | || c == ' ' || c == '0')) | |
475 | { | |
476 | c = next_char (); | |
477 | while (gfc_is_whitespace (c)) | |
478 | c = next_char (); | |
479 | if (c != '\n' && c != '!') | |
480 | { | |
481 | /* Canonicalize to *$omp. */ | |
482 | *start.nextc = '*'; | |
483 | openmp_flag = 1; | |
484 | gfc_current_locus = start; | |
485 | return; | |
486 | } | |
487 | } | |
488 | } | |
489 | } | |
490 | else | |
491 | { | |
492 | int digit_seen = 0; | |
493 | ||
494 | for (col = 3; col < 6; col++, c = next_char ()) | |
495 | if (c == ' ') | |
496 | continue; | |
497 | else if (c < '0' || c > '9') | |
498 | break; | |
499 | else | |
500 | digit_seen = 1; | |
501 | ||
502 | if (col == 6 && c != '\n' | |
503 | && ((continue_flag && !digit_seen) | |
504 | || c == ' ' || c == '0')) | |
505 | { | |
506 | gfc_current_locus = start; | |
507 | start.nextc[0] = ' '; | |
508 | start.nextc[1] = ' '; | |
509 | continue; | |
510 | } | |
511 | } | |
512 | } | |
513 | gfc_current_locus = start; | |
514 | } | |
6de9cd9a DN |
515 | skip_comment_line (); |
516 | continue; | |
517 | } | |
518 | ||
e0bcf78c TS |
519 | if (gfc_option.flag_d_lines != -1 && (c == 'd' || c == 'D')) |
520 | { | |
521 | if (gfc_option.flag_d_lines == 0) | |
522 | { | |
523 | skip_comment_line (); | |
524 | continue; | |
525 | } | |
526 | else | |
527 | *start.nextc = c = ' '; | |
528 | } | |
529 | ||
6de9cd9a | 530 | col = 1; |
e0bcf78c TS |
531 | |
532 | while (gfc_is_whitespace (c)) | |
6de9cd9a DN |
533 | { |
534 | c = next_char (); | |
535 | col++; | |
536 | } | |
6de9cd9a DN |
537 | |
538 | if (c == '\n') | |
539 | { | |
540 | gfc_advance_line (); | |
541 | continue; | |
542 | } | |
543 | ||
544 | if (col != 6 && c == '!') | |
545 | { | |
546 | skip_comment_line (); | |
547 | continue; | |
548 | } | |
549 | ||
550 | break; | |
551 | } | |
552 | ||
6c7a4dfd | 553 | openmp_flag = 0; |
63645982 | 554 | gfc_current_locus = start; |
6de9cd9a DN |
555 | } |
556 | ||
557 | ||
6c7a4dfd | 558 | /* Skips the current line if it is a comment. */ |
6de9cd9a DN |
559 | |
560 | void | |
561 | gfc_skip_comments (void) | |
562 | { | |
6c7a4dfd | 563 | if (gfc_current_form == FORM_FREE) |
6de9cd9a DN |
564 | skip_free_comments (); |
565 | else | |
566 | skip_fixed_comments (); | |
567 | } | |
568 | ||
569 | ||
570 | /* Get the next character from the input, taking continuation lines | |
571 | and end-of-line comments into account. This implies that comment | |
572 | lines between continued lines must be eaten here. For higher-level | |
573 | subroutines, this flattens continued lines into a single logical | |
574 | line. The in_string flag denotes whether we're inside a character | |
575 | context or not. */ | |
576 | ||
577 | int | |
578 | gfc_next_char_literal (int in_string) | |
579 | { | |
580 | locus old_loc; | |
6c7a4dfd | 581 | int i, c, prev_openmp_flag; |
6de9cd9a DN |
582 | |
583 | continue_flag = 0; | |
584 | ||
585 | restart: | |
586 | c = next_char (); | |
587 | if (gfc_at_end ()) | |
588 | return c; | |
589 | ||
d4fa05b9 | 590 | if (gfc_current_form == FORM_FREE) |
6de9cd9a | 591 | { |
6de9cd9a DN |
592 | if (!in_string && c == '!') |
593 | { | |
6c7a4dfd JJ |
594 | if (openmp_flag |
595 | && memcmp (&gfc_current_locus, &openmp_locus, | |
596 | sizeof (gfc_current_locus)) == 0) | |
597 | goto done; | |
598 | ||
6de9cd9a DN |
599 | /* This line can't be continued */ |
600 | do | |
601 | { | |
602 | c = next_char (); | |
603 | } | |
604 | while (c != '\n'); | |
605 | ||
a34938be RG |
606 | /* Avoid truncation warnings for comment ending lines. */ |
607 | gfc_current_locus.lb->truncated = 0; | |
608 | ||
6de9cd9a DN |
609 | goto done; |
610 | } | |
611 | ||
612 | if (c != '&') | |
613 | goto done; | |
614 | ||
615 | /* If the next nonblank character is a ! or \n, we've got a | |
6c7a4dfd | 616 | continuation line. */ |
63645982 | 617 | old_loc = gfc_current_locus; |
6de9cd9a DN |
618 | |
619 | c = next_char (); | |
620 | while (gfc_is_whitespace (c)) | |
621 | c = next_char (); | |
622 | ||
623 | /* Character constants to be continued cannot have commentary | |
6c7a4dfd | 624 | after the '&'. */ |
6de9cd9a DN |
625 | |
626 | if (in_string && c != '\n') | |
627 | { | |
63645982 | 628 | gfc_current_locus = old_loc; |
6de9cd9a DN |
629 | c = '&'; |
630 | goto done; | |
631 | } | |
632 | ||
633 | if (c != '!' && c != '\n') | |
634 | { | |
63645982 | 635 | gfc_current_locus = old_loc; |
6de9cd9a DN |
636 | c = '&'; |
637 | goto done; | |
638 | } | |
639 | ||
6c7a4dfd | 640 | prev_openmp_flag = openmp_flag; |
6de9cd9a DN |
641 | continue_flag = 1; |
642 | if (c == '!') | |
643 | skip_comment_line (); | |
644 | else | |
645 | gfc_advance_line (); | |
646 | ||
647 | /* We've got a continuation line and need to find where it continues. | |
6c7a4dfd | 648 | First eat any comment lines. */ |
6de9cd9a DN |
649 | gfc_skip_comments (); |
650 | ||
6c7a4dfd JJ |
651 | if (prev_openmp_flag != openmp_flag) |
652 | { | |
653 | gfc_current_locus = old_loc; | |
654 | openmp_flag = prev_openmp_flag; | |
655 | c = '&'; | |
656 | goto done; | |
657 | } | |
658 | ||
6de9cd9a | 659 | /* Now that we have a non-comment line, probe ahead for the |
6c7a4dfd JJ |
660 | first non-whitespace character. If it is another '&', then |
661 | reading starts at the next character, otherwise we must back | |
662 | up to where the whitespace started and resume from there. */ | |
6de9cd9a | 663 | |
63645982 | 664 | old_loc = gfc_current_locus; |
6de9cd9a DN |
665 | |
666 | c = next_char (); | |
667 | while (gfc_is_whitespace (c)) | |
668 | c = next_char (); | |
669 | ||
6c7a4dfd JJ |
670 | if (openmp_flag) |
671 | { | |
672 | for (i = 0; i < 5; i++, c = next_char ()) | |
673 | { | |
674 | gcc_assert (TOLOWER (c) == "!$omp"[i]); | |
675 | if (i == 4) | |
676 | old_loc = gfc_current_locus; | |
677 | } | |
678 | while (gfc_is_whitespace (c)) | |
679 | c = next_char (); | |
680 | } | |
681 | ||
6de9cd9a | 682 | if (c != '&') |
63645982 | 683 | gfc_current_locus = old_loc; |
6de9cd9a DN |
684 | } |
685 | else | |
686 | { | |
687 | /* Fixed form continuation. */ | |
688 | if (!in_string && c == '!') | |
689 | { | |
690 | /* Skip comment at end of line. */ | |
691 | do | |
692 | { | |
693 | c = next_char (); | |
694 | } | |
695 | while (c != '\n'); | |
a34938be RG |
696 | |
697 | /* Avoid truncation warnings for comment ending lines. */ | |
698 | gfc_current_locus.lb->truncated = 0; | |
6de9cd9a DN |
699 | } |
700 | ||
701 | if (c != '\n') | |
702 | goto done; | |
703 | ||
6c7a4dfd | 704 | prev_openmp_flag = openmp_flag; |
6de9cd9a | 705 | continue_flag = 1; |
63645982 | 706 | old_loc = gfc_current_locus; |
6de9cd9a DN |
707 | |
708 | gfc_advance_line (); | |
709 | gfc_skip_comments (); | |
710 | ||
711 | /* See if this line is a continuation line. */ | |
6c7a4dfd | 712 | if (openmp_flag != prev_openmp_flag) |
6de9cd9a | 713 | { |
6c7a4dfd JJ |
714 | openmp_flag = prev_openmp_flag; |
715 | goto not_continuation; | |
6de9cd9a DN |
716 | } |
717 | ||
6c7a4dfd JJ |
718 | if (!openmp_flag) |
719 | for (i = 0; i < 5; i++) | |
720 | { | |
721 | c = next_char (); | |
722 | if (c != ' ') | |
723 | goto not_continuation; | |
724 | } | |
725 | else | |
726 | for (i = 0; i < 5; i++) | |
727 | { | |
728 | c = next_char (); | |
729 | if (TOLOWER (c) != "*$omp"[i]) | |
730 | goto not_continuation; | |
731 | } | |
732 | ||
6de9cd9a | 733 | c = next_char (); |
6c7a4dfd | 734 | if (c == '0' || c == ' ' || c == '\n') |
6de9cd9a DN |
735 | goto not_continuation; |
736 | } | |
737 | ||
738 | /* Ready to read first character of continuation line, which might | |
739 | be another continuation line! */ | |
740 | goto restart; | |
741 | ||
742 | not_continuation: | |
743 | c = '\n'; | |
63645982 | 744 | gfc_current_locus = old_loc; |
6de9cd9a DN |
745 | |
746 | done: | |
747 | continue_flag = 0; | |
748 | return c; | |
749 | } | |
750 | ||
751 | ||
752 | /* Get the next character of input, folded to lowercase. In fixed | |
753 | form mode, we also ignore spaces. When matcher subroutines are | |
754 | parsing character literals, they have to call | |
755 | gfc_next_char_literal(). */ | |
756 | ||
757 | int | |
758 | gfc_next_char (void) | |
759 | { | |
760 | int c; | |
761 | ||
762 | do | |
763 | { | |
764 | c = gfc_next_char_literal (0); | |
765 | } | |
d4fa05b9 | 766 | while (gfc_current_form == FORM_FIXED && gfc_is_whitespace (c)); |
6de9cd9a DN |
767 | |
768 | return TOLOWER (c); | |
769 | } | |
770 | ||
771 | ||
772 | int | |
773 | gfc_peek_char (void) | |
774 | { | |
775 | locus old_loc; | |
776 | int c; | |
777 | ||
63645982 | 778 | old_loc = gfc_current_locus; |
6de9cd9a | 779 | c = gfc_next_char (); |
63645982 | 780 | gfc_current_locus = old_loc; |
6de9cd9a DN |
781 | |
782 | return c; | |
783 | } | |
784 | ||
785 | ||
786 | /* Recover from an error. We try to get past the current statement | |
787 | and get lined up for the next. The next statement follows a '\n' | |
788 | or a ';'. We also assume that we are not within a character | |
789 | constant, and deal with finding a '\'' or '"'. */ | |
790 | ||
791 | void | |
792 | gfc_error_recovery (void) | |
793 | { | |
794 | char c, delim; | |
795 | ||
796 | if (gfc_at_eof ()) | |
797 | return; | |
798 | ||
799 | for (;;) | |
800 | { | |
801 | c = gfc_next_char (); | |
802 | if (c == '\n' || c == ';') | |
803 | break; | |
804 | ||
805 | if (c != '\'' && c != '"') | |
806 | { | |
807 | if (gfc_at_eof ()) | |
808 | break; | |
809 | continue; | |
810 | } | |
811 | delim = c; | |
812 | ||
813 | for (;;) | |
814 | { | |
815 | c = next_char (); | |
816 | ||
817 | if (c == delim) | |
818 | break; | |
819 | if (c == '\n') | |
ba1defa5 | 820 | return; |
6de9cd9a DN |
821 | if (c == '\\') |
822 | { | |
823 | c = next_char (); | |
824 | if (c == '\n') | |
ba1defa5 | 825 | return; |
6de9cd9a DN |
826 | } |
827 | } | |
828 | if (gfc_at_eof ()) | |
829 | break; | |
830 | } | |
6de9cd9a DN |
831 | } |
832 | ||
833 | ||
834 | /* Read ahead until the next character to be read is not whitespace. */ | |
835 | ||
836 | void | |
837 | gfc_gobble_whitespace (void) | |
838 | { | |
839 | locus old_loc; | |
840 | int c; | |
841 | ||
842 | do | |
843 | { | |
63645982 | 844 | old_loc = gfc_current_locus; |
6de9cd9a DN |
845 | c = gfc_next_char_literal (0); |
846 | } | |
847 | while (gfc_is_whitespace (c)); | |
848 | ||
63645982 | 849 | gfc_current_locus = old_loc; |
6de9cd9a DN |
850 | } |
851 | ||
852 | ||
f56c5d5d TS |
853 | /* Load a single line into pbuf. |
854 | ||
855 | If pbuf points to a NULL pointer, it is allocated. | |
856 | We truncate lines that are too long, unless we're dealing with | |
857 | preprocessor lines or if the option -ffixed-line-length-none is set, | |
858 | in which case we reallocate the buffer to fit the entire line, if | |
859 | need be. | |
860 | In fixed mode, we expand a tab that occurs within the statement | |
861 | label region to expand to spaces that leave the next character in | |
ba1defa5 | 862 | the source region. |
16ab8e74 | 863 | load_line returns whether the line was truncated. */ |
6de9cd9a | 864 | |
ba1defa5 | 865 | static int |
d1e3d6ae | 866 | load_line (FILE * input, char **pbuf, int *pbuflen) |
6de9cd9a | 867 | { |
d1e3d6ae | 868 | int c, maxlen, i, preprocessor_flag, buflen = *pbuflen; |
ba1defa5 | 869 | int trunc_flag = 0; |
f56c5d5d TS |
870 | char *buffer; |
871 | ||
16ab8e74 BF |
872 | /* Determine the maximum allowed line length. |
873 | The default for free-form is GFC_MAX_LINE, for fixed-form or for | |
874 | unknown form it is 72. Refer to the documentation in gfc_option_t. */ | |
f56c5d5d | 875 | if (gfc_current_form == FORM_FREE) |
16ab8e74 BF |
876 | { |
877 | if (gfc_option.free_line_length == -1) | |
878 | maxlen = GFC_MAX_LINE; | |
879 | else | |
880 | maxlen = gfc_option.free_line_length; | |
881 | } | |
882 | else if (gfc_current_form == FORM_FIXED) | |
883 | { | |
884 | if (gfc_option.fixed_line_length == -1) | |
885 | maxlen = 72; | |
886 | else | |
887 | maxlen = gfc_option.fixed_line_length; | |
888 | } | |
f56c5d5d | 889 | else |
16ab8e74 | 890 | maxlen = 72; |
f56c5d5d TS |
891 | |
892 | if (*pbuf == NULL) | |
893 | { | |
894 | /* Allocate the line buffer, storing its length into buflen. */ | |
895 | if (maxlen > 0) | |
896 | buflen = maxlen; | |
897 | else | |
898 | buflen = GFC_MAX_LINE; | |
6de9cd9a | 899 | |
f56c5d5d TS |
900 | *pbuf = gfc_getmem (buflen + 1); |
901 | } | |
6de9cd9a DN |
902 | |
903 | i = 0; | |
f56c5d5d | 904 | buffer = *pbuf; |
6de9cd9a | 905 | |
fa841200 TS |
906 | preprocessor_flag = 0; |
907 | c = fgetc (input); | |
908 | if (c == '#') | |
f56c5d5d TS |
909 | /* In order to not truncate preprocessor lines, we have to |
910 | remember that this is one. */ | |
fa841200 TS |
911 | preprocessor_flag = 1; |
912 | ungetc (c, input); | |
913 | ||
6de9cd9a DN |
914 | for (;;) |
915 | { | |
916 | c = fgetc (input); | |
917 | ||
918 | if (c == EOF) | |
919 | break; | |
920 | if (c == '\n') | |
921 | break; | |
922 | ||
923 | if (c == '\r') | |
d4fa05b9 | 924 | continue; /* Gobble characters. */ |
6de9cd9a DN |
925 | if (c == '\0') |
926 | continue; | |
927 | ||
d4fa05b9 TS |
928 | if (c == '\032') |
929 | { | |
930 | /* Ctrl-Z ends the file. */ | |
931 | while (fgetc (input) != EOF); | |
932 | break; | |
933 | } | |
934 | ||
935 | if (gfc_current_form == FORM_FIXED && c == '\t' && i <= 6) | |
1f2959f0 | 936 | { /* Tab expansion. */ |
6de9cd9a DN |
937 | while (i <= 6) |
938 | { | |
939 | *buffer++ = ' '; | |
940 | i++; | |
941 | } | |
942 | ||
943 | continue; | |
944 | } | |
945 | ||
946 | *buffer++ = c; | |
947 | i++; | |
948 | ||
d1e3d6ae | 949 | if (maxlen == 0 || preprocessor_flag) |
f56c5d5d | 950 | { |
d1e3d6ae JJ |
951 | if (i >= buflen) |
952 | { | |
953 | /* Reallocate line buffer to double size to hold the | |
954 | overlong line. */ | |
955 | buflen = buflen * 2; | |
956 | *pbuf = xrealloc (*pbuf, buflen + 1); | |
957 | buffer = (*pbuf)+i; | |
958 | } | |
f56c5d5d | 959 | } |
d1e3d6ae | 960 | else if (i >= maxlen) |
16ab8e74 | 961 | { |
f56c5d5d | 962 | /* Truncate the rest of the line. */ |
6de9cd9a DN |
963 | for (;;) |
964 | { | |
965 | c = fgetc (input); | |
966 | if (c == '\n' || c == EOF) | |
967 | break; | |
a34938be RG |
968 | |
969 | trunc_flag = 1; | |
6de9cd9a DN |
970 | } |
971 | ||
972 | ungetc ('\n', input); | |
973 | } | |
974 | } | |
975 | ||
f56c5d5d TS |
976 | /* Pad lines to the selected line length in fixed form. */ |
977 | if (gfc_current_form == FORM_FIXED | |
043c2d9e | 978 | && gfc_option.fixed_line_length != 0 |
f56c5d5d TS |
979 | && !preprocessor_flag |
980 | && c != EOF) | |
043c2d9e BF |
981 | { |
982 | while (i++ < maxlen) | |
983 | *buffer++ = ' '; | |
984 | } | |
f56c5d5d | 985 | |
6de9cd9a | 986 | *buffer = '\0'; |
d1e3d6ae | 987 | *pbuflen = buflen; |
ba1defa5 RG |
988 | |
989 | return trunc_flag; | |
6de9cd9a DN |
990 | } |
991 | ||
992 | ||
d4fa05b9 TS |
993 | /* Get a gfc_file structure, initialize it and add it to |
994 | the file stack. */ | |
995 | ||
996 | static gfc_file * | |
e0bcf78c | 997 | get_file (const char *name, enum lc_reason reason ATTRIBUTE_UNUSED) |
d4fa05b9 TS |
998 | { |
999 | gfc_file *f; | |
1000 | ||
1001 | f = gfc_getmem (sizeof (gfc_file)); | |
1002 | ||
1003 | f->filename = gfc_getmem (strlen (name) + 1); | |
1004 | strcpy (f->filename, name); | |
1005 | ||
1006 | f->next = file_head; | |
1007 | file_head = f; | |
1008 | ||
1009 | f->included_by = current_file; | |
1010 | if (current_file != NULL) | |
1011 | f->inclusion_line = current_file->line; | |
1012 | ||
c8cc8542 PB |
1013 | #ifdef USE_MAPPED_LOCATION |
1014 | linemap_add (&line_table, reason, false, f->filename, 1); | |
1015 | #endif | |
1016 | ||
d4fa05b9 TS |
1017 | return f; |
1018 | } | |
1019 | ||
1020 | /* Deal with a line from the C preprocessor. The | |
1021 | initial octothorp has already been seen. */ | |
6de9cd9a DN |
1022 | |
1023 | static void | |
d4fa05b9 | 1024 | preprocessor_line (char *c) |
6de9cd9a | 1025 | { |
d4fa05b9 TS |
1026 | bool flag[5]; |
1027 | int i, line; | |
1028 | char *filename; | |
1029 | gfc_file *f; | |
2d7c7df6 | 1030 | int escaped, unescape; |
6de9cd9a | 1031 | |
d4fa05b9 TS |
1032 | c++; |
1033 | while (*c == ' ' || *c == '\t') | |
1034 | c++; | |
6de9cd9a | 1035 | |
d4fa05b9 | 1036 | if (*c < '0' || *c > '9') |
fa841200 | 1037 | goto bad_cpp_line; |
6de9cd9a | 1038 | |
d4fa05b9 TS |
1039 | line = atoi (c); |
1040 | ||
4c3a6ca1 | 1041 | c = strchr (c, ' '); |
fa841200 | 1042 | if (c == NULL) |
4c3a6ca1 JJ |
1043 | { |
1044 | /* No file name given. Set new line number. */ | |
1045 | current_file->line = line; | |
1046 | return; | |
1047 | } | |
d7d528c8 ES |
1048 | |
1049 | /* Skip spaces. */ | |
1050 | while (*c == ' ' || *c == '\t') | |
1051 | c++; | |
1052 | ||
1053 | /* Skip quote. */ | |
1054 | if (*c != '"') | |
fa841200 | 1055 | goto bad_cpp_line; |
d7d528c8 ES |
1056 | ++c; |
1057 | ||
d4fa05b9 TS |
1058 | filename = c; |
1059 | ||
d7d528c8 | 1060 | /* Make filename end at quote. */ |
2d7c7df6 | 1061 | unescape = 0; |
d7d528c8 ES |
1062 | escaped = false; |
1063 | while (*c && ! (! escaped && *c == '"')) | |
1064 | { | |
1065 | if (escaped) | |
1066 | escaped = false; | |
2d7c7df6 JJ |
1067 | else if (*c == '\\') |
1068 | { | |
1069 | escaped = true; | |
1070 | unescape++; | |
1071 | } | |
d7d528c8 ES |
1072 | ++c; |
1073 | } | |
1074 | ||
1075 | if (! *c) | |
fa841200 TS |
1076 | /* Preprocessor line has no closing quote. */ |
1077 | goto bad_cpp_line; | |
d7d528c8 | 1078 | |
d4fa05b9 TS |
1079 | *c++ = '\0'; |
1080 | ||
2d7c7df6 JJ |
1081 | /* Undo effects of cpp_quote_string. */ |
1082 | if (unescape) | |
1083 | { | |
1084 | char *s = filename; | |
1085 | char *d = gfc_getmem (c - filename - unescape); | |
d7d528c8 | 1086 | |
2d7c7df6 JJ |
1087 | filename = d; |
1088 | while (*s) | |
1089 | { | |
1090 | if (*s == '\\') | |
1091 | *d++ = *++s; | |
1092 | else | |
1093 | *d++ = *s; | |
1094 | s++; | |
1095 | } | |
1096 | *d = '\0'; | |
1097 | } | |
d7d528c8 | 1098 | |
d4fa05b9 | 1099 | /* Get flags. */ |
4c3a6ca1 | 1100 | |
1e39a151 | 1101 | flag[1] = flag[2] = flag[3] = flag[4] = false; |
6de9cd9a | 1102 | |
6de9cd9a DN |
1103 | for (;;) |
1104 | { | |
d4fa05b9 TS |
1105 | c = strchr (c, ' '); |
1106 | if (c == NULL) | |
1107 | break; | |
6de9cd9a | 1108 | |
d4fa05b9 TS |
1109 | c++; |
1110 | i = atoi (c); | |
6de9cd9a | 1111 | |
d4fa05b9 TS |
1112 | if (1 <= i && i <= 4) |
1113 | flag[i] = true; | |
1114 | } | |
4c3a6ca1 | 1115 | |
d4fa05b9 | 1116 | /* Interpret flags. */ |
4c3a6ca1 | 1117 | |
94b00ee4 | 1118 | if (flag[1]) /* Starting new file. */ |
d4fa05b9 | 1119 | { |
c8cc8542 | 1120 | f = get_file (filename, LC_RENAME); |
d4fa05b9 TS |
1121 | f->up = current_file; |
1122 | current_file = f; | |
1123 | } | |
4c3a6ca1 | 1124 | |
d4fa05b9 TS |
1125 | if (flag[2]) /* Ending current file. */ |
1126 | { | |
94b00ee4 JJ |
1127 | if (!current_file->up |
1128 | || strcmp (current_file->up->filename, filename) != 0) | |
4c3a6ca1 JJ |
1129 | { |
1130 | gfc_warning_now ("%s:%d: file %s left but not entered", | |
1131 | current_file->filename, current_file->line, | |
1132 | filename); | |
2d7c7df6 JJ |
1133 | if (unescape) |
1134 | gfc_free (filename); | |
4c3a6ca1 JJ |
1135 | return; |
1136 | } | |
94b00ee4 | 1137 | current_file = current_file->up; |
d4fa05b9 | 1138 | } |
4c3a6ca1 | 1139 | |
d4fa05b9 TS |
1140 | /* The name of the file can be a temporary file produced by |
1141 | cpp. Replace the name if it is different. */ | |
4c3a6ca1 | 1142 | |
d4fa05b9 TS |
1143 | if (strcmp (current_file->filename, filename) != 0) |
1144 | { | |
1145 | gfc_free (current_file->filename); | |
1146 | current_file->filename = gfc_getmem (strlen (filename) + 1); | |
1147 | strcpy (current_file->filename, filename); | |
1148 | } | |
fa841200 | 1149 | |
4c3a6ca1 JJ |
1150 | /* Set new line number. */ |
1151 | current_file->line = line; | |
2d7c7df6 JJ |
1152 | if (unescape) |
1153 | gfc_free (filename); | |
fa841200 TS |
1154 | return; |
1155 | ||
1156 | bad_cpp_line: | |
4c3a6ca1 | 1157 | gfc_warning_now ("%s:%d: Illegal preprocessor directive", |
fa841200 TS |
1158 | current_file->filename, current_file->line); |
1159 | current_file->line++; | |
d4fa05b9 TS |
1160 | } |
1161 | ||
1162 | ||
e0bcf78c | 1163 | static try load_file (const char *, bool); |
d4fa05b9 TS |
1164 | |
1165 | /* include_line()-- Checks a line buffer to see if it is an include | |
1166 | line. If so, we call load_file() recursively to load the included | |
1167 | file. We never return a syntax error because a statement like | |
1168 | "include = 5" is perfectly legal. We return false if no include was | |
1169 | processed or true if we matched an include. */ | |
1170 | ||
1171 | static bool | |
1172 | include_line (char *line) | |
1173 | { | |
1174 | char quote, *c, *begin, *stop; | |
1175 | ||
1176 | c = line; | |
1177 | while (*c == ' ' || *c == '\t') | |
1178 | c++; | |
1179 | ||
1180 | if (strncasecmp (c, "include", 7)) | |
1181 | return false; | |
1182 | ||
1183 | c += 7; | |
1184 | while (*c == ' ' || *c == '\t') | |
1185 | c++; | |
1186 | ||
1187 | /* Find filename between quotes. */ | |
1188 | ||
1189 | quote = *c++; | |
1190 | if (quote != '"' && quote != '\'') | |
1191 | return false; | |
1192 | ||
1193 | begin = c; | |
1194 | ||
1195 | while (*c != quote && *c != '\0') | |
1196 | c++; | |
1197 | ||
1198 | if (*c == '\0') | |
1199 | return false; | |
1200 | ||
1201 | stop = c++; | |
1202 | ||
1203 | while (*c == ' ' || *c == '\t') | |
1204 | c++; | |
1205 | ||
1206 | if (*c != '\0' && *c != '!') | |
1207 | return false; | |
1208 | ||
f7b529fa | 1209 | /* We have an include line at this point. */ |
d4fa05b9 TS |
1210 | |
1211 | *stop = '\0'; /* It's ok to trash the buffer, as this line won't be | |
1212 | read by anything else. */ | |
1213 | ||
1214 | load_file (begin, false); | |
1215 | return true; | |
1216 | } | |
1217 | ||
1218 | /* Load a file into memory by calling load_line until the file ends. */ | |
1219 | ||
1220 | static try | |
e0bcf78c | 1221 | load_file (const char *filename, bool initial) |
d4fa05b9 | 1222 | { |
f56c5d5d | 1223 | char *line; |
d4fa05b9 TS |
1224 | gfc_linebuf *b; |
1225 | gfc_file *f; | |
1226 | FILE *input; | |
d1e3d6ae | 1227 | int len, line_len; |
d4fa05b9 TS |
1228 | |
1229 | for (f = current_file; f; f = f->up) | |
1230 | if (strcmp (filename, f->filename) == 0) | |
1231 | { | |
1232 | gfc_error_now ("File '%s' is being included recursively", filename); | |
1233 | return FAILURE; | |
1234 | } | |
1235 | ||
1236 | if (initial) | |
1237 | { | |
2d7c7df6 JJ |
1238 | if (gfc_src_file) |
1239 | { | |
1240 | input = gfc_src_file; | |
1241 | gfc_src_file = NULL; | |
1242 | } | |
1243 | else | |
1244 | input = gfc_open_file (filename); | |
d4fa05b9 TS |
1245 | if (input == NULL) |
1246 | { | |
1247 | gfc_error_now ("Can't open file '%s'", filename); | |
1248 | return FAILURE; | |
1249 | } | |
1250 | } | |
1251 | else | |
1252 | { | |
b424a572 | 1253 | input = gfc_open_included_file (filename, false); |
d4fa05b9 TS |
1254 | if (input == NULL) |
1255 | { | |
1256 | gfc_error_now ("Can't open included file '%s'", filename); | |
1257 | return FAILURE; | |
1258 | } | |
1259 | } | |
1260 | ||
1261 | /* Load the file. */ | |
1262 | ||
c8cc8542 | 1263 | f = get_file (filename, initial ? LC_RENAME : LC_ENTER); |
d4fa05b9 TS |
1264 | f->up = current_file; |
1265 | current_file = f; | |
1266 | current_file->line = 1; | |
f56c5d5d | 1267 | line = NULL; |
d1e3d6ae | 1268 | line_len = 0; |
d4fa05b9 | 1269 | |
2d7c7df6 JJ |
1270 | if (initial && gfc_src_preprocessor_lines[0]) |
1271 | { | |
1272 | preprocessor_line (gfc_src_preprocessor_lines[0]); | |
1273 | gfc_free (gfc_src_preprocessor_lines[0]); | |
1274 | gfc_src_preprocessor_lines[0] = NULL; | |
1275 | if (gfc_src_preprocessor_lines[1]) | |
1276 | { | |
1277 | preprocessor_line (gfc_src_preprocessor_lines[1]); | |
1278 | gfc_free (gfc_src_preprocessor_lines[1]); | |
1279 | gfc_src_preprocessor_lines[1] = NULL; | |
1280 | } | |
1281 | } | |
1282 | ||
16ab8e74 | 1283 | for (;;) |
d4fa05b9 | 1284 | { |
d1e3d6ae | 1285 | int trunc = load_line (input, &line, &line_len); |
d4fa05b9 TS |
1286 | |
1287 | len = strlen (line); | |
6de9cd9a DN |
1288 | if (feof (input) && len == 0) |
1289 | break; | |
1290 | ||
d4fa05b9 TS |
1291 | /* There are three things this line can be: a line of Fortran |
1292 | source, an include line or a C preprocessor directive. */ | |
6de9cd9a | 1293 | |
d4fa05b9 TS |
1294 | if (line[0] == '#') |
1295 | { | |
1296 | preprocessor_line (line); | |
1297 | continue; | |
1298 | } | |
6de9cd9a | 1299 | |
d4fa05b9 TS |
1300 | if (include_line (line)) |
1301 | { | |
1302 | current_file->line++; | |
1303 | continue; | |
6de9cd9a DN |
1304 | } |
1305 | ||
d4fa05b9 TS |
1306 | /* Add line. */ |
1307 | ||
4cdf7223 | 1308 | b = gfc_getmem (gfc_linebuf_header_size + len + 1); |
d4fa05b9 | 1309 | |
c8cc8542 PB |
1310 | #ifdef USE_MAPPED_LOCATION |
1311 | b->location | |
1312 | = linemap_line_start (&line_table, current_file->line++, 120); | |
1313 | #else | |
d4fa05b9 | 1314 | b->linenum = current_file->line++; |
c8cc8542 | 1315 | #endif |
d4fa05b9 | 1316 | b->file = current_file; |
ba1defa5 | 1317 | b->truncated = trunc; |
d4fa05b9 TS |
1318 | strcpy (b->line, line); |
1319 | ||
1320 | if (line_head == NULL) | |
1321 | line_head = b; | |
1322 | else | |
1323 | line_tail->next = b; | |
1324 | ||
1325 | line_tail = b; | |
6de9cd9a | 1326 | } |
d4fa05b9 | 1327 | |
f56c5d5d TS |
1328 | /* Release the line buffer allocated in load_line. */ |
1329 | gfc_free (line); | |
1330 | ||
d4fa05b9 TS |
1331 | fclose (input); |
1332 | ||
1333 | current_file = current_file->up; | |
c8cc8542 PB |
1334 | #ifdef USE_MAPPED_LOCATION |
1335 | linemap_add (&line_table, LC_LEAVE, 0, NULL, 0); | |
1336 | #endif | |
d4fa05b9 | 1337 | return SUCCESS; |
6de9cd9a DN |
1338 | } |
1339 | ||
1340 | ||
d4fa05b9 TS |
1341 | /* Open a new file and start scanning from that file. Returns SUCCESS |
1342 | if everything went OK, FAILURE otherwise. If form == FORM_UKNOWN | |
1343 | it tries to determine the source form from the filename, defaulting | |
1344 | to free form. */ | |
6de9cd9a DN |
1345 | |
1346 | try | |
e0bcf78c | 1347 | gfc_new_file (void) |
6de9cd9a | 1348 | { |
d4fa05b9 | 1349 | try result; |
6de9cd9a | 1350 | |
d4fa05b9 | 1351 | result = load_file (gfc_source_file, true); |
6de9cd9a | 1352 | |
63645982 TS |
1353 | gfc_current_locus.lb = line_head; |
1354 | gfc_current_locus.nextc = (line_head == NULL) ? NULL : line_head->line; | |
6de9cd9a | 1355 | |
d4fa05b9 TS |
1356 | #if 0 /* Debugging aid. */ |
1357 | for (; line_head; line_head = line_head->next) | |
1358 | gfc_status ("%s:%3d %s\n", line_head->file->filename, | |
c8cc8542 PB |
1359 | #ifdef USE_MAPPED_LOCATION |
1360 | LOCATION_LINE (line_head->location), | |
1361 | #else | |
1362 | line_head->linenum, | |
1363 | #endif | |
1364 | line_head->line); | |
6de9cd9a | 1365 | |
d4fa05b9 TS |
1366 | exit (0); |
1367 | #endif | |
6de9cd9a | 1368 | |
d4fa05b9 | 1369 | return result; |
6de9cd9a | 1370 | } |
2d7c7df6 JJ |
1371 | |
1372 | static char * | |
1373 | unescape_filename (const char *ptr) | |
1374 | { | |
1375 | const char *p = ptr, *s; | |
1376 | char *d, *ret; | |
1377 | int escaped, unescape = 0; | |
1378 | ||
1379 | /* Make filename end at quote. */ | |
1380 | escaped = false; | |
1381 | while (*p && ! (! escaped && *p == '"')) | |
1382 | { | |
1383 | if (escaped) | |
1384 | escaped = false; | |
1385 | else if (*p == '\\') | |
1386 | { | |
1387 | escaped = true; | |
1388 | unescape++; | |
1389 | } | |
1390 | ++p; | |
1391 | } | |
1392 | ||
1393 | if (! *p || p[1]) | |
1394 | return NULL; | |
1395 | ||
1396 | /* Undo effects of cpp_quote_string. */ | |
1397 | s = ptr; | |
1398 | d = gfc_getmem (p + 1 - ptr - unescape); | |
1399 | ret = d; | |
1400 | ||
1401 | while (s != p) | |
1402 | { | |
1403 | if (*s == '\\') | |
1404 | *d++ = *++s; | |
1405 | else | |
1406 | *d++ = *s; | |
1407 | s++; | |
1408 | } | |
1409 | *d = '\0'; | |
1410 | return ret; | |
1411 | } | |
1412 | ||
1413 | /* For preprocessed files, if the first tokens are of the form # NUM. | |
1414 | handle the directives so we know the original file name. */ | |
1415 | ||
1416 | const char * | |
1417 | gfc_read_orig_filename (const char *filename, const char **canon_source_file) | |
1418 | { | |
1419 | int c, len; | |
1420 | char *dirname; | |
1421 | ||
1422 | gfc_src_file = gfc_open_file (filename); | |
1423 | if (gfc_src_file == NULL) | |
1424 | return NULL; | |
1425 | ||
1426 | c = fgetc (gfc_src_file); | |
1427 | ungetc (c, gfc_src_file); | |
1428 | ||
1429 | if (c != '#') | |
1430 | return NULL; | |
1431 | ||
1432 | len = 0; | |
1433 | load_line (gfc_src_file, &gfc_src_preprocessor_lines[0], &len); | |
1434 | ||
1435 | if (strncmp (gfc_src_preprocessor_lines[0], "# 1 \"", 5) != 0) | |
1436 | return NULL; | |
1437 | ||
1438 | filename = unescape_filename (gfc_src_preprocessor_lines[0] + 5); | |
1439 | if (filename == NULL) | |
1440 | return NULL; | |
1441 | ||
1442 | c = fgetc (gfc_src_file); | |
1443 | ungetc (c, gfc_src_file); | |
1444 | ||
1445 | if (c != '#') | |
1446 | return filename; | |
1447 | ||
1448 | len = 0; | |
1449 | load_line (gfc_src_file, &gfc_src_preprocessor_lines[1], &len); | |
1450 | ||
1451 | if (strncmp (gfc_src_preprocessor_lines[1], "# 1 \"", 5) != 0) | |
1452 | return filename; | |
1453 | ||
1454 | dirname = unescape_filename (gfc_src_preprocessor_lines[1] + 5); | |
1455 | if (dirname == NULL) | |
1456 | return filename; | |
1457 | ||
1458 | len = strlen (dirname); | |
1459 | if (len < 3 || dirname[len - 1] != '/' || dirname[len - 2] != '/') | |
1460 | { | |
1461 | gfc_free (dirname); | |
1462 | return filename; | |
1463 | } | |
1464 | dirname[len - 2] = '\0'; | |
1465 | set_src_pwd (dirname); | |
1466 | ||
1467 | if (! IS_ABSOLUTE_PATH (filename)) | |
1468 | { | |
1469 | char *p = gfc_getmem (len + strlen (filename)); | |
1470 | ||
1471 | memcpy (p, dirname, len - 2); | |
1472 | p[len - 2] = '/'; | |
1473 | strcpy (p + len - 1, filename); | |
1474 | *canon_source_file = p; | |
1475 | } | |
1476 | ||
1477 | gfc_free (dirname); | |
1478 | return filename; | |
1479 | } |