]>
Commit | Line | Data |
---|---|---|
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 | 63 | static int continue_flag, end_flag, openmp_flag; |
5a06474c | 64 | static int continue_count, continue_line; |
6c7a4dfd | 65 | static locus openmp_locus; |
6de9cd9a | 66 | |
d4fa05b9 TS |
67 | gfc_source_form gfc_current_form; |
68 | static gfc_linebuf *line_head, *line_tail; | |
69 | ||
63645982 | 70 | locus gfc_current_locus; |
e0bcf78c | 71 | const char *gfc_source_file; |
2d7c7df6 JJ |
72 | static FILE *gfc_src_file; |
73 | static char *gfc_src_preprocessor_lines[2]; | |
74 | ||
5a06474c | 75 | extern int pedantic; |
6de9cd9a DN |
76 | |
77 | /* Main scanner initialization. */ | |
78 | ||
79 | void | |
80 | gfc_scanner_init_1 (void) | |
81 | { | |
d4fa05b9 TS |
82 | file_head = NULL; |
83 | line_head = NULL; | |
84 | line_tail = NULL; | |
6de9cd9a | 85 | |
5a06474c JD |
86 | continue_count = 0; |
87 | continue_line = 0; | |
88 | ||
6de9cd9a DN |
89 | end_flag = 0; |
90 | } | |
91 | ||
92 | ||
93 | /* Main scanner destructor. */ | |
94 | ||
95 | void | |
96 | gfc_scanner_done_1 (void) | |
97 | { | |
d4fa05b9 TS |
98 | gfc_linebuf *lb; |
99 | gfc_file *f; | |
6de9cd9a | 100 | |
d4fa05b9 | 101 | while(line_head != NULL) |
6de9cd9a | 102 | { |
d4fa05b9 TS |
103 | lb = line_head->next; |
104 | gfc_free(line_head); | |
105 | line_head = lb; | |
6de9cd9a | 106 | } |
d4fa05b9 TS |
107 | |
108 | while(file_head != NULL) | |
6de9cd9a | 109 | { |
d4fa05b9 TS |
110 | f = file_head->next; |
111 | gfc_free(file_head->filename); | |
112 | gfc_free(file_head); | |
113 | file_head = f; | |
6de9cd9a | 114 | } |
d4fa05b9 | 115 | |
6de9cd9a DN |
116 | } |
117 | ||
118 | ||
119 | /* Adds path to the list pointed to by list. */ | |
120 | ||
121 | void | |
122 | gfc_add_include_path (const char *path) | |
123 | { | |
124 | gfc_directorylist *dir; | |
125 | const char *p; | |
126 | ||
127 | p = path; | |
128 | while (*p == ' ' || *p == '\t') /* someone might do 'gfortran "-I include"' */ | |
129 | if (*p++ == '\0') | |
130 | return; | |
131 | ||
132 | dir = include_dirs; | |
133 | if (!dir) | |
134 | { | |
135 | dir = include_dirs = gfc_getmem (sizeof (gfc_directorylist)); | |
136 | } | |
137 | else | |
138 | { | |
139 | while (dir->next) | |
140 | dir = dir->next; | |
141 | ||
142 | dir->next = gfc_getmem (sizeof (gfc_directorylist)); | |
143 | dir = dir->next; | |
144 | } | |
145 | ||
146 | dir->next = NULL; | |
147 | dir->path = gfc_getmem (strlen (p) + 2); | |
148 | strcpy (dir->path, p); | |
149 | strcat (dir->path, "/"); /* make '/' last character */ | |
150 | } | |
151 | ||
152 | ||
153 | /* Release resources allocated for options. */ | |
154 | ||
155 | void | |
156 | gfc_release_include_path (void) | |
157 | { | |
158 | gfc_directorylist *p; | |
159 | ||
160 | gfc_free (gfc_option.module_dir); | |
161 | while (include_dirs != NULL) | |
162 | { | |
163 | p = include_dirs; | |
164 | include_dirs = include_dirs->next; | |
165 | gfc_free (p->path); | |
166 | gfc_free (p); | |
167 | } | |
168 | } | |
169 | ||
6de9cd9a | 170 | /* Opens file for reading, searching through the include directories |
b424a572 FXC |
171 | given if necessary. If the include_cwd argument is true, we try |
172 | to open the file in the current directory first. */ | |
6de9cd9a DN |
173 | |
174 | FILE * | |
b424a572 | 175 | gfc_open_included_file (const char *name, const bool include_cwd) |
6de9cd9a | 176 | { |
200cfbe7 | 177 | char *fullname; |
6de9cd9a DN |
178 | gfc_directorylist *p; |
179 | FILE *f; | |
180 | ||
b424a572 FXC |
181 | if (include_cwd) |
182 | { | |
183 | f = gfc_open_file (name); | |
184 | if (f != NULL) | |
185 | return f; | |
186 | } | |
6de9cd9a DN |
187 | |
188 | for (p = include_dirs; p; p = p->next) | |
189 | { | |
200cfbe7 | 190 | fullname = (char *) alloca(strlen (p->path) + strlen (name) + 1); |
6de9cd9a DN |
191 | strcpy (fullname, p->path); |
192 | strcat (fullname, name); | |
193 | ||
194 | f = gfc_open_file (fullname); | |
195 | if (f != NULL) | |
196 | return f; | |
197 | } | |
198 | ||
199 | return NULL; | |
200 | } | |
201 | ||
6de9cd9a DN |
202 | /* Test to see if we're at the end of the main source file. */ |
203 | ||
204 | int | |
205 | gfc_at_end (void) | |
206 | { | |
207 | ||
208 | return end_flag; | |
209 | } | |
210 | ||
211 | ||
212 | /* Test to see if we're at the end of the current file. */ | |
213 | ||
214 | int | |
215 | gfc_at_eof (void) | |
216 | { | |
217 | ||
218 | if (gfc_at_end ()) | |
219 | return 1; | |
220 | ||
d4fa05b9 | 221 | if (line_head == NULL) |
6de9cd9a DN |
222 | return 1; /* Null file */ |
223 | ||
63645982 | 224 | if (gfc_current_locus.lb == NULL) |
6de9cd9a DN |
225 | return 1; |
226 | ||
227 | return 0; | |
228 | } | |
229 | ||
230 | ||
231 | /* Test to see if we're at the beginning of a new line. */ | |
232 | ||
233 | int | |
234 | gfc_at_bol (void) | |
235 | { | |
6de9cd9a DN |
236 | if (gfc_at_eof ()) |
237 | return 1; | |
238 | ||
63645982 | 239 | return (gfc_current_locus.nextc == gfc_current_locus.lb->line); |
6de9cd9a DN |
240 | } |
241 | ||
242 | ||
243 | /* Test to see if we're at the end of a line. */ | |
244 | ||
245 | int | |
246 | gfc_at_eol (void) | |
247 | { | |
248 | ||
249 | if (gfc_at_eof ()) | |
250 | return 1; | |
251 | ||
63645982 | 252 | return (*gfc_current_locus.nextc == '\0'); |
6de9cd9a DN |
253 | } |
254 | ||
255 | ||
256 | /* Advance the current line pointer to the next line. */ | |
257 | ||
258 | void | |
259 | gfc_advance_line (void) | |
260 | { | |
6de9cd9a DN |
261 | if (gfc_at_end ()) |
262 | return; | |
263 | ||
63645982 | 264 | if (gfc_current_locus.lb == NULL) |
6de9cd9a | 265 | { |
d4fa05b9 TS |
266 | end_flag = 1; |
267 | return; | |
268 | } | |
6de9cd9a | 269 | |
63645982 | 270 | gfc_current_locus.lb = gfc_current_locus.lb->next; |
6de9cd9a | 271 | |
63645982 TS |
272 | if (gfc_current_locus.lb != NULL) |
273 | gfc_current_locus.nextc = gfc_current_locus.lb->line; | |
d4fa05b9 TS |
274 | else |
275 | { | |
63645982 | 276 | gfc_current_locus.nextc = NULL; |
d4fa05b9 TS |
277 | end_flag = 1; |
278 | } | |
6de9cd9a DN |
279 | } |
280 | ||
281 | ||
282 | /* Get the next character from the input, advancing gfc_current_file's | |
283 | locus. When we hit the end of the line or the end of the file, we | |
284 | start returning a '\n' in order to complete the current statement. | |
285 | No Fortran line conventions are implemented here. | |
286 | ||
287 | Requiring explicit advances to the next line prevents the parse | |
288 | pointer from being on the wrong line if the current statement ends | |
289 | prematurely. */ | |
290 | ||
291 | static int | |
292 | next_char (void) | |
293 | { | |
6de9cd9a | 294 | int c; |
d4fa05b9 | 295 | |
63645982 | 296 | if (gfc_current_locus.nextc == NULL) |
6de9cd9a DN |
297 | return '\n'; |
298 | ||
63645982 | 299 | c = *gfc_current_locus.nextc++; |
6de9cd9a DN |
300 | if (c == '\0') |
301 | { | |
63645982 | 302 | gfc_current_locus.nextc--; /* Remain on this line. */ |
6de9cd9a DN |
303 | c = '\n'; |
304 | } | |
305 | ||
306 | return c; | |
307 | } | |
308 | ||
6de9cd9a DN |
309 | /* Skip a comment. When we come here the parse pointer is positioned |
310 | immediately after the comment character. If we ever implement | |
311 | compiler directives withing comments, here is where we parse the | |
312 | directive. */ | |
313 | ||
314 | static void | |
315 | skip_comment_line (void) | |
316 | { | |
317 | char c; | |
318 | ||
319 | do | |
320 | { | |
321 | c = next_char (); | |
322 | } | |
323 | while (c != '\n'); | |
324 | ||
325 | gfc_advance_line (); | |
326 | } | |
327 | ||
328 | ||
329 | /* Comment lines are null lines, lines containing only blanks or lines | |
0d3abf6f JJ |
330 | on which the first nonblank line is a '!'. |
331 | Return true if !$ openmp conditional compilation sentinel was | |
332 | seen. */ | |
6de9cd9a | 333 | |
0d3abf6f | 334 | static bool |
6de9cd9a DN |
335 | skip_free_comments (void) |
336 | { | |
337 | locus start; | |
338 | char c; | |
6c7a4dfd | 339 | int at_bol; |
6de9cd9a DN |
340 | |
341 | for (;;) | |
342 | { | |
6c7a4dfd | 343 | at_bol = gfc_at_bol (); |
63645982 | 344 | start = gfc_current_locus; |
6de9cd9a DN |
345 | if (gfc_at_eof ()) |
346 | break; | |
347 | ||
348 | do | |
6c7a4dfd | 349 | c = next_char (); |
6de9cd9a DN |
350 | while (gfc_is_whitespace (c)); |
351 | ||
352 | if (c == '\n') | |
353 | { | |
354 | gfc_advance_line (); | |
355 | continue; | |
356 | } | |
357 | ||
358 | if (c == '!') | |
359 | { | |
6c7a4dfd JJ |
360 | /* If -fopenmp, we need to handle here 2 things: |
361 | 1) don't treat !$omp as comments, but directives | |
362 | 2) handle OpenMP conditional compilation, where | |
363 | !$ should be treated as 2 spaces (for initial lines | |
364 | only if followed by space). */ | |
365 | if (gfc_option.flag_openmp && at_bol) | |
366 | { | |
367 | locus old_loc = gfc_current_locus; | |
368 | if (next_char () == '$') | |
369 | { | |
370 | c = next_char (); | |
371 | if (c == 'o' || c == 'O') | |
372 | { | |
373 | if (((c = next_char ()) == 'm' || c == 'M') | |
374 | && ((c = next_char ()) == 'p' || c == 'P') | |
375 | && ((c = next_char ()) == ' ' || continue_flag)) | |
376 | { | |
377 | while (gfc_is_whitespace (c)) | |
378 | c = next_char (); | |
379 | if (c != '\n' && c != '!') | |
380 | { | |
381 | openmp_flag = 1; | |
382 | openmp_locus = old_loc; | |
383 | gfc_current_locus = start; | |
0d3abf6f | 384 | return false; |
6c7a4dfd JJ |
385 | } |
386 | } | |
387 | gfc_current_locus = old_loc; | |
388 | next_char (); | |
389 | c = next_char (); | |
390 | } | |
391 | if (continue_flag || c == ' ') | |
392 | { | |
393 | gfc_current_locus = old_loc; | |
394 | next_char (); | |
b30c6a0d | 395 | openmp_flag = 0; |
0d3abf6f | 396 | return true; |
6c7a4dfd JJ |
397 | } |
398 | } | |
399 | gfc_current_locus = old_loc; | |
400 | } | |
6de9cd9a DN |
401 | skip_comment_line (); |
402 | continue; | |
403 | } | |
404 | ||
405 | break; | |
406 | } | |
407 | ||
6c7a4dfd JJ |
408 | if (openmp_flag && at_bol) |
409 | openmp_flag = 0; | |
63645982 | 410 | gfc_current_locus = start; |
0d3abf6f | 411 | return false; |
6de9cd9a DN |
412 | } |
413 | ||
414 | ||
415 | /* Skip comment lines in fixed source mode. We have the same rules as | |
416 | in skip_free_comment(), except that we can have a 'c', 'C' or '*' | |
e0bcf78c TS |
417 | in column 1, and a '!' cannot be in column 6. Also, we deal with |
418 | lines with 'd' or 'D' in column 1, if the user requested this. */ | |
6de9cd9a DN |
419 | |
420 | static void | |
421 | skip_fixed_comments (void) | |
422 | { | |
423 | locus start; | |
424 | int col; | |
425 | char c; | |
426 | ||
6c7a4dfd JJ |
427 | if (! gfc_at_bol ()) |
428 | { | |
429 | start = gfc_current_locus; | |
430 | if (! gfc_at_eof ()) | |
431 | { | |
432 | do | |
433 | c = next_char (); | |
434 | while (gfc_is_whitespace (c)); | |
435 | ||
436 | if (c == '\n') | |
437 | gfc_advance_line (); | |
438 | else if (c == '!') | |
439 | skip_comment_line (); | |
440 | } | |
441 | ||
442 | if (! gfc_at_bol ()) | |
443 | { | |
444 | gfc_current_locus = start; | |
445 | return; | |
446 | } | |
447 | } | |
448 | ||
6de9cd9a DN |
449 | for (;;) |
450 | { | |
63645982 | 451 | start = gfc_current_locus; |
6de9cd9a DN |
452 | if (gfc_at_eof ()) |
453 | break; | |
454 | ||
455 | c = next_char (); | |
456 | if (c == '\n') | |
457 | { | |
458 | gfc_advance_line (); | |
459 | continue; | |
460 | } | |
461 | ||
462 | if (c == '!' || c == 'c' || c == 'C' || c == '*') | |
463 | { | |
6c7a4dfd JJ |
464 | /* If -fopenmp, we need to handle here 2 things: |
465 | 1) don't treat !$omp|c$omp|*$omp as comments, but directives | |
466 | 2) handle OpenMP conditional compilation, where | |
467 | !$|c$|*$ should be treated as 2 spaces if the characters | |
468 | in columns 3 to 6 are valid fixed form label columns | |
469 | characters. */ | |
470 | if (gfc_option.flag_openmp) | |
471 | { | |
472 | if (next_char () == '$') | |
473 | { | |
474 | c = next_char (); | |
475 | if (c == 'o' || c == 'O') | |
476 | { | |
477 | if (((c = next_char ()) == 'm' || c == 'M') | |
478 | && ((c = next_char ()) == 'p' || c == 'P')) | |
479 | { | |
480 | c = next_char (); | |
481 | if (c != '\n' | |
482 | && ((openmp_flag && continue_flag) | |
483 | || c == ' ' || c == '0')) | |
484 | { | |
485 | c = next_char (); | |
486 | while (gfc_is_whitespace (c)) | |
487 | c = next_char (); | |
488 | if (c != '\n' && c != '!') | |
489 | { | |
490 | /* Canonicalize to *$omp. */ | |
491 | *start.nextc = '*'; | |
492 | openmp_flag = 1; | |
493 | gfc_current_locus = start; | |
494 | return; | |
495 | } | |
496 | } | |
497 | } | |
498 | } | |
499 | else | |
500 | { | |
501 | int digit_seen = 0; | |
502 | ||
503 | for (col = 3; col < 6; col++, c = next_char ()) | |
504 | if (c == ' ') | |
505 | continue; | |
506 | else if (c < '0' || c > '9') | |
507 | break; | |
508 | else | |
509 | digit_seen = 1; | |
510 | ||
511 | if (col == 6 && c != '\n' | |
512 | && ((continue_flag && !digit_seen) | |
513 | || c == ' ' || c == '0')) | |
514 | { | |
515 | gfc_current_locus = start; | |
516 | start.nextc[0] = ' '; | |
517 | start.nextc[1] = ' '; | |
518 | continue; | |
519 | } | |
520 | } | |
521 | } | |
522 | gfc_current_locus = start; | |
523 | } | |
6de9cd9a DN |
524 | skip_comment_line (); |
525 | continue; | |
526 | } | |
527 | ||
e0bcf78c TS |
528 | if (gfc_option.flag_d_lines != -1 && (c == 'd' || c == 'D')) |
529 | { | |
530 | if (gfc_option.flag_d_lines == 0) | |
531 | { | |
532 | skip_comment_line (); | |
533 | continue; | |
534 | } | |
535 | else | |
536 | *start.nextc = c = ' '; | |
537 | } | |
538 | ||
6de9cd9a | 539 | col = 1; |
e0bcf78c TS |
540 | |
541 | while (gfc_is_whitespace (c)) | |
6de9cd9a DN |
542 | { |
543 | c = next_char (); | |
544 | col++; | |
545 | } | |
6de9cd9a DN |
546 | |
547 | if (c == '\n') | |
548 | { | |
549 | gfc_advance_line (); | |
550 | continue; | |
551 | } | |
552 | ||
553 | if (col != 6 && c == '!') | |
554 | { | |
555 | skip_comment_line (); | |
556 | continue; | |
557 | } | |
558 | ||
559 | break; | |
560 | } | |
561 | ||
6c7a4dfd | 562 | openmp_flag = 0; |
63645982 | 563 | gfc_current_locus = start; |
6de9cd9a DN |
564 | } |
565 | ||
566 | ||
6c7a4dfd | 567 | /* Skips the current line if it is a comment. */ |
6de9cd9a DN |
568 | |
569 | void | |
570 | gfc_skip_comments (void) | |
571 | { | |
6c7a4dfd | 572 | if (gfc_current_form == FORM_FREE) |
6de9cd9a DN |
573 | skip_free_comments (); |
574 | else | |
575 | skip_fixed_comments (); | |
576 | } | |
577 | ||
578 | ||
579 | /* Get the next character from the input, taking continuation lines | |
580 | and end-of-line comments into account. This implies that comment | |
581 | lines between continued lines must be eaten here. For higher-level | |
582 | subroutines, this flattens continued lines into a single logical | |
583 | line. The in_string flag denotes whether we're inside a character | |
584 | context or not. */ | |
585 | ||
586 | int | |
587 | gfc_next_char_literal (int in_string) | |
588 | { | |
589 | locus old_loc; | |
6c7a4dfd | 590 | int i, c, prev_openmp_flag; |
6de9cd9a DN |
591 | |
592 | continue_flag = 0; | |
593 | ||
594 | restart: | |
595 | c = next_char (); | |
596 | if (gfc_at_end ()) | |
5a06474c JD |
597 | { |
598 | continue_count = 0; | |
599 | return c; | |
600 | } | |
6de9cd9a | 601 | |
d4fa05b9 | 602 | if (gfc_current_form == FORM_FREE) |
6de9cd9a | 603 | { |
0d3abf6f JJ |
604 | bool openmp_cond_flag; |
605 | ||
6de9cd9a DN |
606 | if (!in_string && c == '!') |
607 | { | |
6c7a4dfd JJ |
608 | if (openmp_flag |
609 | && memcmp (&gfc_current_locus, &openmp_locus, | |
610 | sizeof (gfc_current_locus)) == 0) | |
611 | goto done; | |
612 | ||
6de9cd9a DN |
613 | /* This line can't be continued */ |
614 | do | |
615 | { | |
616 | c = next_char (); | |
617 | } | |
618 | while (c != '\n'); | |
619 | ||
a34938be RG |
620 | /* Avoid truncation warnings for comment ending lines. */ |
621 | gfc_current_locus.lb->truncated = 0; | |
622 | ||
6de9cd9a DN |
623 | goto done; |
624 | } | |
625 | ||
626 | if (c != '&') | |
627 | goto done; | |
628 | ||
629 | /* If the next nonblank character is a ! or \n, we've got a | |
6c7a4dfd | 630 | continuation line. */ |
63645982 | 631 | old_loc = gfc_current_locus; |
6de9cd9a DN |
632 | |
633 | c = next_char (); | |
634 | while (gfc_is_whitespace (c)) | |
635 | c = next_char (); | |
636 | ||
637 | /* Character constants to be continued cannot have commentary | |
6c7a4dfd | 638 | after the '&'. */ |
6de9cd9a DN |
639 | |
640 | if (in_string && c != '\n') | |
641 | { | |
63645982 | 642 | gfc_current_locus = old_loc; |
6de9cd9a DN |
643 | c = '&'; |
644 | goto done; | |
645 | } | |
646 | ||
647 | if (c != '!' && c != '\n') | |
648 | { | |
63645982 | 649 | gfc_current_locus = old_loc; |
6de9cd9a DN |
650 | c = '&'; |
651 | goto done; | |
652 | } | |
653 | ||
6c7a4dfd | 654 | prev_openmp_flag = openmp_flag; |
6de9cd9a DN |
655 | continue_flag = 1; |
656 | if (c == '!') | |
657 | skip_comment_line (); | |
658 | else | |
659 | gfc_advance_line (); | |
660 | ||
5a06474c JD |
661 | /* We've got a continuation line. If we are on the very next line after |
662 | the last continuation, increment the continuation line count and | |
663 | check whether the limit has been exceeded. */ | |
664 | if (gfc_current_locus.lb->linenum == continue_line + 1) | |
665 | { | |
666 | if (++continue_count == gfc_option.max_continue_free) | |
667 | { | |
668 | if (gfc_notification_std (GFC_STD_GNU) | |
669 | || pedantic) | |
670 | gfc_warning ("Limit of %d continuations exceeded in statement at %C", | |
671 | gfc_option.max_continue_free); | |
672 | } | |
673 | } | |
674 | continue_line = gfc_current_locus.lb->linenum; | |
675 | ||
676 | /* Now find where it continues. First eat any comment lines. */ | |
0d3abf6f | 677 | openmp_cond_flag = skip_free_comments (); |
6de9cd9a | 678 | |
6c7a4dfd JJ |
679 | if (prev_openmp_flag != openmp_flag) |
680 | { | |
681 | gfc_current_locus = old_loc; | |
682 | openmp_flag = prev_openmp_flag; | |
683 | c = '&'; | |
684 | goto done; | |
685 | } | |
686 | ||
6de9cd9a | 687 | /* Now that we have a non-comment line, probe ahead for the |
6c7a4dfd JJ |
688 | first non-whitespace character. If it is another '&', then |
689 | reading starts at the next character, otherwise we must back | |
690 | up to where the whitespace started and resume from there. */ | |
6de9cd9a | 691 | |
63645982 | 692 | old_loc = gfc_current_locus; |
6de9cd9a DN |
693 | |
694 | c = next_char (); | |
695 | while (gfc_is_whitespace (c)) | |
696 | c = next_char (); | |
697 | ||
6c7a4dfd JJ |
698 | if (openmp_flag) |
699 | { | |
700 | for (i = 0; i < 5; i++, c = next_char ()) | |
701 | { | |
702 | gcc_assert (TOLOWER (c) == "!$omp"[i]); | |
703 | if (i == 4) | |
704 | old_loc = gfc_current_locus; | |
705 | } | |
706 | while (gfc_is_whitespace (c)) | |
707 | c = next_char (); | |
708 | } | |
709 | ||
6de9cd9a | 710 | if (c != '&') |
3fbab549 | 711 | { |
5a06474c JD |
712 | if (in_string) |
713 | { | |
714 | if (gfc_option.warn_ampersand) | |
715 | gfc_warning_now ("Missing '&' in continued character constant at %C"); | |
716 | gfc_current_locus.nextc--; | |
717 | } | |
0d3abf6f JJ |
718 | /* Both !$omp and !$ -fopenmp continuation lines have & on the |
719 | continuation line only optionally. */ | |
720 | else if (openmp_flag || openmp_cond_flag) | |
721 | gfc_current_locus.nextc--; | |
5a06474c JD |
722 | else |
723 | { | |
724 | c = ' '; | |
725 | gfc_current_locus = old_loc; | |
726 | goto done; | |
727 | } | |
3fbab549 | 728 | } |
6de9cd9a DN |
729 | } |
730 | else | |
731 | { | |
732 | /* Fixed form continuation. */ | |
733 | if (!in_string && c == '!') | |
734 | { | |
735 | /* Skip comment at end of line. */ | |
736 | do | |
737 | { | |
738 | c = next_char (); | |
739 | } | |
740 | while (c != '\n'); | |
a34938be RG |
741 | |
742 | /* Avoid truncation warnings for comment ending lines. */ | |
743 | gfc_current_locus.lb->truncated = 0; | |
6de9cd9a DN |
744 | } |
745 | ||
746 | if (c != '\n') | |
747 | goto done; | |
748 | ||
6c7a4dfd | 749 | prev_openmp_flag = openmp_flag; |
6de9cd9a | 750 | continue_flag = 1; |
63645982 | 751 | old_loc = gfc_current_locus; |
6de9cd9a DN |
752 | |
753 | gfc_advance_line (); | |
0d3abf6f | 754 | skip_fixed_comments (); |
6de9cd9a DN |
755 | |
756 | /* See if this line is a continuation line. */ | |
6c7a4dfd | 757 | if (openmp_flag != prev_openmp_flag) |
6de9cd9a | 758 | { |
6c7a4dfd JJ |
759 | openmp_flag = prev_openmp_flag; |
760 | goto not_continuation; | |
6de9cd9a DN |
761 | } |
762 | ||
6c7a4dfd JJ |
763 | if (!openmp_flag) |
764 | for (i = 0; i < 5; i++) | |
765 | { | |
766 | c = next_char (); | |
767 | if (c != ' ') | |
768 | goto not_continuation; | |
769 | } | |
770 | else | |
771 | for (i = 0; i < 5; i++) | |
772 | { | |
773 | c = next_char (); | |
774 | if (TOLOWER (c) != "*$omp"[i]) | |
775 | goto not_continuation; | |
776 | } | |
777 | ||
6de9cd9a | 778 | c = next_char (); |
6c7a4dfd | 779 | if (c == '0' || c == ' ' || c == '\n') |
6de9cd9a | 780 | goto not_continuation; |
5a06474c JD |
781 | |
782 | /* We've got a continuation line. If we are on the very next line after | |
783 | the last continuation, increment the continuation line count and | |
784 | check whether the limit has been exceeded. */ | |
785 | if (gfc_current_locus.lb->linenum == continue_line + 1) | |
786 | { | |
787 | if (++continue_count == gfc_option.max_continue_fixed) | |
788 | { | |
789 | if (gfc_notification_std (GFC_STD_GNU) | |
790 | || pedantic) | |
791 | gfc_warning ("Limit of %d continuations exceeded in statement at %C", | |
792 | gfc_option.max_continue_fixed); | |
793 | } | |
794 | } | |
795 | ||
796 | if (continue_line < gfc_current_locus.lb->linenum) | |
797 | continue_line = gfc_current_locus.lb->linenum; | |
6de9cd9a DN |
798 | } |
799 | ||
800 | /* Ready to read first character of continuation line, which might | |
801 | be another continuation line! */ | |
802 | goto restart; | |
803 | ||
804 | not_continuation: | |
805 | c = '\n'; | |
63645982 | 806 | gfc_current_locus = old_loc; |
6de9cd9a DN |
807 | |
808 | done: | |
5a06474c JD |
809 | if (c == '\n') |
810 | continue_count = 0; | |
6de9cd9a DN |
811 | continue_flag = 0; |
812 | return c; | |
813 | } | |
814 | ||
815 | ||
816 | /* Get the next character of input, folded to lowercase. In fixed | |
817 | form mode, we also ignore spaces. When matcher subroutines are | |
818 | parsing character literals, they have to call | |
819 | gfc_next_char_literal(). */ | |
820 | ||
821 | int | |
822 | gfc_next_char (void) | |
823 | { | |
824 | int c; | |
825 | ||
826 | do | |
827 | { | |
828 | c = gfc_next_char_literal (0); | |
829 | } | |
d4fa05b9 | 830 | while (gfc_current_form == FORM_FIXED && gfc_is_whitespace (c)); |
6de9cd9a DN |
831 | |
832 | return TOLOWER (c); | |
833 | } | |
834 | ||
835 | ||
836 | int | |
837 | gfc_peek_char (void) | |
838 | { | |
839 | locus old_loc; | |
840 | int c; | |
841 | ||
63645982 | 842 | old_loc = gfc_current_locus; |
6de9cd9a | 843 | c = gfc_next_char (); |
63645982 | 844 | gfc_current_locus = old_loc; |
6de9cd9a DN |
845 | |
846 | return c; | |
847 | } | |
848 | ||
849 | ||
850 | /* Recover from an error. We try to get past the current statement | |
851 | and get lined up for the next. The next statement follows a '\n' | |
852 | or a ';'. We also assume that we are not within a character | |
853 | constant, and deal with finding a '\'' or '"'. */ | |
854 | ||
855 | void | |
856 | gfc_error_recovery (void) | |
857 | { | |
858 | char c, delim; | |
859 | ||
860 | if (gfc_at_eof ()) | |
861 | return; | |
862 | ||
863 | for (;;) | |
864 | { | |
865 | c = gfc_next_char (); | |
866 | if (c == '\n' || c == ';') | |
867 | break; | |
868 | ||
869 | if (c != '\'' && c != '"') | |
870 | { | |
871 | if (gfc_at_eof ()) | |
872 | break; | |
873 | continue; | |
874 | } | |
875 | delim = c; | |
876 | ||
877 | for (;;) | |
878 | { | |
879 | c = next_char (); | |
880 | ||
881 | if (c == delim) | |
882 | break; | |
883 | if (c == '\n') | |
ba1defa5 | 884 | return; |
6de9cd9a DN |
885 | if (c == '\\') |
886 | { | |
887 | c = next_char (); | |
888 | if (c == '\n') | |
ba1defa5 | 889 | return; |
6de9cd9a DN |
890 | } |
891 | } | |
892 | if (gfc_at_eof ()) | |
893 | break; | |
894 | } | |
6de9cd9a DN |
895 | } |
896 | ||
897 | ||
898 | /* Read ahead until the next character to be read is not whitespace. */ | |
899 | ||
900 | void | |
901 | gfc_gobble_whitespace (void) | |
902 | { | |
840bd9f7 | 903 | static int linenum = 0; |
6de9cd9a DN |
904 | locus old_loc; |
905 | int c; | |
906 | ||
907 | do | |
908 | { | |
63645982 | 909 | old_loc = gfc_current_locus; |
6de9cd9a | 910 | c = gfc_next_char_literal (0); |
840bd9f7 SK |
911 | /* Issue a warning for nonconforming tabs. We keep track of the line |
912 | number because the Fortran matchers will often back up and the same | |
913 | line will be scanned multiple times. */ | |
45a82bd9 | 914 | if (!gfc_option.warn_tabs && c == '\t') |
840bd9f7 | 915 | { |
45a82bd9 PB |
916 | #ifdef USE_MAPPED_LOCATION |
917 | int cur_linenum = LOCATION_LINE (gfc_current_locus.lb->location); | |
918 | #else | |
919 | int cur_linenum = gfc_current_locus.lb->linenum; | |
920 | #endif | |
921 | if (cur_linenum != linenum) | |
922 | { | |
923 | linenum = cur_linenum; | |
924 | gfc_warning_now ("Nonconforming tab character at %C"); | |
925 | } | |
840bd9f7 | 926 | } |
6de9cd9a DN |
927 | } |
928 | while (gfc_is_whitespace (c)); | |
929 | ||
63645982 | 930 | gfc_current_locus = old_loc; |
6de9cd9a DN |
931 | } |
932 | ||
933 | ||
f56c5d5d TS |
934 | /* Load a single line into pbuf. |
935 | ||
936 | If pbuf points to a NULL pointer, it is allocated. | |
937 | We truncate lines that are too long, unless we're dealing with | |
938 | preprocessor lines or if the option -ffixed-line-length-none is set, | |
939 | in which case we reallocate the buffer to fit the entire line, if | |
940 | need be. | |
941 | In fixed mode, we expand a tab that occurs within the statement | |
942 | label region to expand to spaces that leave the next character in | |
ba1defa5 | 943 | the source region. |
1526c4b5 JD |
944 | load_line returns whether the line was truncated. |
945 | ||
946 | NOTE: The error machinery isn't available at this point, so we can't | |
947 | easily report line and column numbers consistent with other | |
948 | parts of gfortran. */ | |
6de9cd9a | 949 | |
ba1defa5 | 950 | static int |
d1e3d6ae | 951 | load_line (FILE * input, char **pbuf, int *pbuflen) |
6de9cd9a | 952 | { |
840bd9f7 | 953 | static int linenum = 0, current_line = 1; |
d1e3d6ae | 954 | int c, maxlen, i, preprocessor_flag, buflen = *pbuflen; |
840bd9f7 | 955 | int trunc_flag = 0, seen_comment = 0; |
1526c4b5 | 956 | int seen_printable = 0, seen_ampersand = 0; |
f56c5d5d TS |
957 | char *buffer; |
958 | ||
1dde8683 | 959 | /* Determine the maximum allowed line length. */ |
f56c5d5d | 960 | if (gfc_current_form == FORM_FREE) |
1dde8683 | 961 | maxlen = gfc_option.free_line_length; |
16ab8e74 | 962 | else if (gfc_current_form == FORM_FIXED) |
1dde8683 | 963 | maxlen = gfc_option.fixed_line_length; |
f56c5d5d | 964 | else |
16ab8e74 | 965 | maxlen = 72; |
f56c5d5d TS |
966 | |
967 | if (*pbuf == NULL) | |
968 | { | |
1dde8683 BM |
969 | /* Allocate the line buffer, storing its length into buflen. |
970 | Note that if maxlen==0, indicating that arbitrary-length lines | |
971 | are allowed, the buffer will be reallocated if this length is | |
972 | insufficient; since 132 characters is the length of a standard | |
973 | free-form line, we use that as a starting guess. */ | |
f56c5d5d TS |
974 | if (maxlen > 0) |
975 | buflen = maxlen; | |
976 | else | |
1dde8683 | 977 | buflen = 132; |
6de9cd9a | 978 | |
f56c5d5d TS |
979 | *pbuf = gfc_getmem (buflen + 1); |
980 | } | |
6de9cd9a DN |
981 | |
982 | i = 0; | |
f56c5d5d | 983 | buffer = *pbuf; |
6de9cd9a | 984 | |
fa841200 TS |
985 | preprocessor_flag = 0; |
986 | c = fgetc (input); | |
987 | if (c == '#') | |
f56c5d5d TS |
988 | /* In order to not truncate preprocessor lines, we have to |
989 | remember that this is one. */ | |
fa841200 TS |
990 | preprocessor_flag = 1; |
991 | ungetc (c, input); | |
992 | ||
6de9cd9a DN |
993 | for (;;) |
994 | { | |
995 | c = fgetc (input); | |
996 | ||
997 | if (c == EOF) | |
998 | break; | |
999 | if (c == '\n') | |
1526c4b5 JD |
1000 | { |
1001 | /* Check for illegal use of ampersand. See F95 Standard 3.3.1.3. */ | |
1002 | if (gfc_current_form == FORM_FREE | |
1003 | && !seen_printable && seen_ampersand) | |
1004 | { | |
1005 | if (pedantic) | |
1006 | gfc_error_now | |
1007 | ("'&' not allowed by itself in line %d", current_line); | |
1008 | else | |
1009 | gfc_warning_now | |
1010 | ("'&' not allowed by itself in line %d", current_line); | |
1011 | } | |
1012 | break; | |
1013 | } | |
6de9cd9a DN |
1014 | |
1015 | if (c == '\r') | |
d4fa05b9 | 1016 | continue; /* Gobble characters. */ |
6de9cd9a DN |
1017 | if (c == '\0') |
1018 | continue; | |
1019 | ||
d4fa05b9 TS |
1020 | if (c == '\032') |
1021 | { | |
1022 | /* Ctrl-Z ends the file. */ | |
1023 | while (fgetc (input) != EOF); | |
1024 | break; | |
1025 | } | |
1026 | ||
1526c4b5 JD |
1027 | /* Check for illegal use of ampersand. See F95 Standard 3.3.1.3. */ |
1028 | if (c == '&') | |
1029 | seen_ampersand = 1; | |
1030 | ||
1031 | if ((c != ' ' && c != '&' && c != '!') || (c == '!' && !seen_ampersand)) | |
1032 | seen_printable = 1; | |
1033 | ||
1034 | if (gfc_current_form == FORM_FREE | |
1035 | && c == '!' && !seen_printable && seen_ampersand) | |
1036 | { | |
1037 | if (pedantic) | |
1038 | gfc_error_now ( | |
1039 | "'&' not allowed by itself with comment in line %d", current_line); | |
1040 | else | |
1041 | gfc_warning_now ( | |
1042 | "'&' not allowed by itself with comment in line %d", current_line); | |
1043 | seen_printable = 1; | |
1044 | } | |
1045 | ||
840bd9f7 SK |
1046 | /* Is this a fixed-form comment? */ |
1047 | if (gfc_current_form == FORM_FIXED && i == 0 | |
1048 | && (c == '*' || c == 'c' || c == 'd')) | |
1049 | seen_comment = 1; | |
1050 | ||
d4fa05b9 | 1051 | if (gfc_current_form == FORM_FIXED && c == '\t' && i <= 6) |
840bd9f7 | 1052 | { |
840bd9f7 SK |
1053 | if (!gfc_option.warn_tabs && seen_comment == 0 |
1054 | && current_line != linenum) | |
1055 | { | |
1056 | linenum = current_line; | |
1057 | gfc_warning_now ( | |
1058 | "Nonconforming tab character in column 1 of line %d", linenum); | |
1059 | } | |
1060 | ||
6de9cd9a DN |
1061 | while (i <= 6) |
1062 | { | |
1063 | *buffer++ = ' '; | |
1064 | i++; | |
1065 | } | |
1066 | ||
1067 | continue; | |
1068 | } | |
1069 | ||
1070 | *buffer++ = c; | |
1071 | i++; | |
1072 | ||
d1e3d6ae | 1073 | if (maxlen == 0 || preprocessor_flag) |
f56c5d5d | 1074 | { |
d1e3d6ae JJ |
1075 | if (i >= buflen) |
1076 | { | |
1077 | /* Reallocate line buffer to double size to hold the | |
3fbab549 | 1078 | overlong line. */ |
d1e3d6ae JJ |
1079 | buflen = buflen * 2; |
1080 | *pbuf = xrealloc (*pbuf, buflen + 1); | |
1081 | buffer = (*pbuf)+i; | |
1082 | } | |
f56c5d5d | 1083 | } |
d1e3d6ae | 1084 | else if (i >= maxlen) |
16ab8e74 | 1085 | { |
f56c5d5d | 1086 | /* Truncate the rest of the line. */ |
6de9cd9a DN |
1087 | for (;;) |
1088 | { | |
1089 | c = fgetc (input); | |
1090 | if (c == '\n' || c == EOF) | |
1091 | break; | |
a34938be RG |
1092 | |
1093 | trunc_flag = 1; | |
6de9cd9a DN |
1094 | } |
1095 | ||
1096 | ungetc ('\n', input); | |
1097 | } | |
1098 | } | |
1099 | ||
f56c5d5d TS |
1100 | /* Pad lines to the selected line length in fixed form. */ |
1101 | if (gfc_current_form == FORM_FIXED | |
043c2d9e | 1102 | && gfc_option.fixed_line_length != 0 |
f56c5d5d TS |
1103 | && !preprocessor_flag |
1104 | && c != EOF) | |
043c2d9e BF |
1105 | { |
1106 | while (i++ < maxlen) | |
1107 | *buffer++ = ' '; | |
1108 | } | |
f56c5d5d | 1109 | |
6de9cd9a | 1110 | *buffer = '\0'; |
d1e3d6ae | 1111 | *pbuflen = buflen; |
840bd9f7 | 1112 | current_line++; |
ba1defa5 RG |
1113 | |
1114 | return trunc_flag; | |
6de9cd9a DN |
1115 | } |
1116 | ||
1117 | ||
d4fa05b9 TS |
1118 | /* Get a gfc_file structure, initialize it and add it to |
1119 | the file stack. */ | |
1120 | ||
1121 | static gfc_file * | |
e0bcf78c | 1122 | get_file (const char *name, enum lc_reason reason ATTRIBUTE_UNUSED) |
d4fa05b9 TS |
1123 | { |
1124 | gfc_file *f; | |
1125 | ||
1126 | f = gfc_getmem (sizeof (gfc_file)); | |
1127 | ||
1128 | f->filename = gfc_getmem (strlen (name) + 1); | |
1129 | strcpy (f->filename, name); | |
1130 | ||
1131 | f->next = file_head; | |
1132 | file_head = f; | |
1133 | ||
1134 | f->included_by = current_file; | |
1135 | if (current_file != NULL) | |
1136 | f->inclusion_line = current_file->line; | |
1137 | ||
c8cc8542 PB |
1138 | #ifdef USE_MAPPED_LOCATION |
1139 | linemap_add (&line_table, reason, false, f->filename, 1); | |
1140 | #endif | |
1141 | ||
d4fa05b9 TS |
1142 | return f; |
1143 | } | |
1144 | ||
1145 | /* Deal with a line from the C preprocessor. The | |
1146 | initial octothorp has already been seen. */ | |
6de9cd9a DN |
1147 | |
1148 | static void | |
d4fa05b9 | 1149 | preprocessor_line (char *c) |
6de9cd9a | 1150 | { |
d4fa05b9 TS |
1151 | bool flag[5]; |
1152 | int i, line; | |
1153 | char *filename; | |
1154 | gfc_file *f; | |
2d7c7df6 | 1155 | int escaped, unescape; |
6de9cd9a | 1156 | |
d4fa05b9 TS |
1157 | c++; |
1158 | while (*c == ' ' || *c == '\t') | |
1159 | c++; | |
6de9cd9a | 1160 | |
d4fa05b9 | 1161 | if (*c < '0' || *c > '9') |
fa841200 | 1162 | goto bad_cpp_line; |
6de9cd9a | 1163 | |
d4fa05b9 TS |
1164 | line = atoi (c); |
1165 | ||
4c3a6ca1 | 1166 | c = strchr (c, ' '); |
fa841200 | 1167 | if (c == NULL) |
4c3a6ca1 JJ |
1168 | { |
1169 | /* No file name given. Set new line number. */ | |
1170 | current_file->line = line; | |
1171 | return; | |
1172 | } | |
d7d528c8 ES |
1173 | |
1174 | /* Skip spaces. */ | |
1175 | while (*c == ' ' || *c == '\t') | |
1176 | c++; | |
1177 | ||
1178 | /* Skip quote. */ | |
1179 | if (*c != '"') | |
fa841200 | 1180 | goto bad_cpp_line; |
d7d528c8 ES |
1181 | ++c; |
1182 | ||
d4fa05b9 TS |
1183 | filename = c; |
1184 | ||
d7d528c8 | 1185 | /* Make filename end at quote. */ |
2d7c7df6 | 1186 | unescape = 0; |
d7d528c8 ES |
1187 | escaped = false; |
1188 | while (*c && ! (! escaped && *c == '"')) | |
1189 | { | |
1190 | if (escaped) | |
1191 | escaped = false; | |
2d7c7df6 JJ |
1192 | else if (*c == '\\') |
1193 | { | |
1194 | escaped = true; | |
1195 | unescape++; | |
1196 | } | |
d7d528c8 ES |
1197 | ++c; |
1198 | } | |
1199 | ||
1200 | if (! *c) | |
fa841200 TS |
1201 | /* Preprocessor line has no closing quote. */ |
1202 | goto bad_cpp_line; | |
d7d528c8 | 1203 | |
d4fa05b9 TS |
1204 | *c++ = '\0'; |
1205 | ||
2d7c7df6 JJ |
1206 | /* Undo effects of cpp_quote_string. */ |
1207 | if (unescape) | |
1208 | { | |
1209 | char *s = filename; | |
1210 | char *d = gfc_getmem (c - filename - unescape); | |
d7d528c8 | 1211 | |
2d7c7df6 JJ |
1212 | filename = d; |
1213 | while (*s) | |
1214 | { | |
1215 | if (*s == '\\') | |
1216 | *d++ = *++s; | |
1217 | else | |
1218 | *d++ = *s; | |
1219 | s++; | |
1220 | } | |
1221 | *d = '\0'; | |
1222 | } | |
d7d528c8 | 1223 | |
d4fa05b9 | 1224 | /* Get flags. */ |
4c3a6ca1 | 1225 | |
1e39a151 | 1226 | flag[1] = flag[2] = flag[3] = flag[4] = false; |
6de9cd9a | 1227 | |
6de9cd9a DN |
1228 | for (;;) |
1229 | { | |
d4fa05b9 TS |
1230 | c = strchr (c, ' '); |
1231 | if (c == NULL) | |
1232 | break; | |
6de9cd9a | 1233 | |
d4fa05b9 TS |
1234 | c++; |
1235 | i = atoi (c); | |
6de9cd9a | 1236 | |
d4fa05b9 TS |
1237 | if (1 <= i && i <= 4) |
1238 | flag[i] = true; | |
1239 | } | |
4c3a6ca1 | 1240 | |
d4fa05b9 | 1241 | /* Interpret flags. */ |
4c3a6ca1 | 1242 | |
94b00ee4 | 1243 | if (flag[1]) /* Starting new file. */ |
d4fa05b9 | 1244 | { |
c8cc8542 | 1245 | f = get_file (filename, LC_RENAME); |
d4fa05b9 TS |
1246 | f->up = current_file; |
1247 | current_file = f; | |
1248 | } | |
4c3a6ca1 | 1249 | |
d4fa05b9 TS |
1250 | if (flag[2]) /* Ending current file. */ |
1251 | { | |
94b00ee4 JJ |
1252 | if (!current_file->up |
1253 | || strcmp (current_file->up->filename, filename) != 0) | |
4c3a6ca1 JJ |
1254 | { |
1255 | gfc_warning_now ("%s:%d: file %s left but not entered", | |
1256 | current_file->filename, current_file->line, | |
1257 | filename); | |
2d7c7df6 JJ |
1258 | if (unescape) |
1259 | gfc_free (filename); | |
4c3a6ca1 JJ |
1260 | return; |
1261 | } | |
94b00ee4 | 1262 | current_file = current_file->up; |
d4fa05b9 | 1263 | } |
4c3a6ca1 | 1264 | |
d4fa05b9 TS |
1265 | /* The name of the file can be a temporary file produced by |
1266 | cpp. Replace the name if it is different. */ | |
4c3a6ca1 | 1267 | |
d4fa05b9 TS |
1268 | if (strcmp (current_file->filename, filename) != 0) |
1269 | { | |
1270 | gfc_free (current_file->filename); | |
1271 | current_file->filename = gfc_getmem (strlen (filename) + 1); | |
1272 | strcpy (current_file->filename, filename); | |
1273 | } | |
fa841200 | 1274 | |
4c3a6ca1 JJ |
1275 | /* Set new line number. */ |
1276 | current_file->line = line; | |
2d7c7df6 JJ |
1277 | if (unescape) |
1278 | gfc_free (filename); | |
fa841200 TS |
1279 | return; |
1280 | ||
1281 | bad_cpp_line: | |
4c3a6ca1 | 1282 | gfc_warning_now ("%s:%d: Illegal preprocessor directive", |
fa841200 TS |
1283 | current_file->filename, current_file->line); |
1284 | current_file->line++; | |
d4fa05b9 TS |
1285 | } |
1286 | ||
1287 | ||
e0bcf78c | 1288 | static try load_file (const char *, bool); |
d4fa05b9 TS |
1289 | |
1290 | /* include_line()-- Checks a line buffer to see if it is an include | |
1291 | line. If so, we call load_file() recursively to load the included | |
1292 | file. We never return a syntax error because a statement like | |
1293 | "include = 5" is perfectly legal. We return false if no include was | |
1294 | processed or true if we matched an include. */ | |
1295 | ||
1296 | static bool | |
1297 | include_line (char *line) | |
1298 | { | |
1299 | char quote, *c, *begin, *stop; | |
9b9e4cd6 | 1300 | |
d4fa05b9 | 1301 | c = line; |
9b9e4cd6 JJ |
1302 | |
1303 | if (gfc_option.flag_openmp) | |
1304 | { | |
1305 | if (gfc_current_form == FORM_FREE) | |
1306 | { | |
1307 | while (*c == ' ' || *c == '\t') | |
1308 | c++; | |
1309 | if (*c == '!' && c[1] == '$' && (c[2] == ' ' || c[2] == '\t')) | |
1310 | c += 3; | |
1311 | } | |
1312 | else | |
1313 | { | |
1314 | if ((*c == '!' || *c == 'c' || *c == 'C' || *c == '*') | |
1315 | && c[1] == '$' && (c[2] == ' ' || c[2] == '\t')) | |
1316 | c += 3; | |
1317 | } | |
1318 | } | |
1319 | ||
d4fa05b9 TS |
1320 | while (*c == ' ' || *c == '\t') |
1321 | c++; | |
1322 | ||
1323 | if (strncasecmp (c, "include", 7)) | |
1324 | return false; | |
1325 | ||
1326 | c += 7; | |
1327 | while (*c == ' ' || *c == '\t') | |
1328 | c++; | |
1329 | ||
1330 | /* Find filename between quotes. */ | |
1331 | ||
1332 | quote = *c++; | |
1333 | if (quote != '"' && quote != '\'') | |
1334 | return false; | |
1335 | ||
1336 | begin = c; | |
1337 | ||
1338 | while (*c != quote && *c != '\0') | |
1339 | c++; | |
1340 | ||
1341 | if (*c == '\0') | |
1342 | return false; | |
1343 | ||
1344 | stop = c++; | |
1345 | ||
1346 | while (*c == ' ' || *c == '\t') | |
1347 | c++; | |
1348 | ||
1349 | if (*c != '\0' && *c != '!') | |
1350 | return false; | |
1351 | ||
f7b529fa | 1352 | /* We have an include line at this point. */ |
d4fa05b9 TS |
1353 | |
1354 | *stop = '\0'; /* It's ok to trash the buffer, as this line won't be | |
1355 | read by anything else. */ | |
1356 | ||
1357 | load_file (begin, false); | |
1358 | return true; | |
1359 | } | |
1360 | ||
1361 | /* Load a file into memory by calling load_line until the file ends. */ | |
1362 | ||
1363 | static try | |
e0bcf78c | 1364 | load_file (const char *filename, bool initial) |
d4fa05b9 | 1365 | { |
f56c5d5d | 1366 | char *line; |
d4fa05b9 TS |
1367 | gfc_linebuf *b; |
1368 | gfc_file *f; | |
1369 | FILE *input; | |
d1e3d6ae | 1370 | int len, line_len; |
d4fa05b9 TS |
1371 | |
1372 | for (f = current_file; f; f = f->up) | |
1373 | if (strcmp (filename, f->filename) == 0) | |
1374 | { | |
1375 | gfc_error_now ("File '%s' is being included recursively", filename); | |
1376 | return FAILURE; | |
1377 | } | |
1378 | ||
1379 | if (initial) | |
1380 | { | |
2d7c7df6 JJ |
1381 | if (gfc_src_file) |
1382 | { | |
1383 | input = gfc_src_file; | |
1384 | gfc_src_file = NULL; | |
1385 | } | |
1386 | else | |
1387 | input = gfc_open_file (filename); | |
d4fa05b9 TS |
1388 | if (input == NULL) |
1389 | { | |
1390 | gfc_error_now ("Can't open file '%s'", filename); | |
1391 | return FAILURE; | |
1392 | } | |
1393 | } | |
1394 | else | |
1395 | { | |
b424a572 | 1396 | input = gfc_open_included_file (filename, false); |
d4fa05b9 TS |
1397 | if (input == NULL) |
1398 | { | |
1399 | gfc_error_now ("Can't open included file '%s'", filename); | |
1400 | return FAILURE; | |
1401 | } | |
1402 | } | |
1403 | ||
1404 | /* Load the file. */ | |
1405 | ||
c8cc8542 | 1406 | f = get_file (filename, initial ? LC_RENAME : LC_ENTER); |
d4fa05b9 TS |
1407 | f->up = current_file; |
1408 | current_file = f; | |
1409 | current_file->line = 1; | |
f56c5d5d | 1410 | line = NULL; |
d1e3d6ae | 1411 | line_len = 0; |
d4fa05b9 | 1412 | |
2d7c7df6 JJ |
1413 | if (initial && gfc_src_preprocessor_lines[0]) |
1414 | { | |
1415 | preprocessor_line (gfc_src_preprocessor_lines[0]); | |
1416 | gfc_free (gfc_src_preprocessor_lines[0]); | |
1417 | gfc_src_preprocessor_lines[0] = NULL; | |
1418 | if (gfc_src_preprocessor_lines[1]) | |
1419 | { | |
1420 | preprocessor_line (gfc_src_preprocessor_lines[1]); | |
1421 | gfc_free (gfc_src_preprocessor_lines[1]); | |
1422 | gfc_src_preprocessor_lines[1] = NULL; | |
1423 | } | |
1424 | } | |
1425 | ||
16ab8e74 | 1426 | for (;;) |
d4fa05b9 | 1427 | { |
d1e3d6ae | 1428 | int trunc = load_line (input, &line, &line_len); |
d4fa05b9 TS |
1429 | |
1430 | len = strlen (line); | |
6de9cd9a DN |
1431 | if (feof (input) && len == 0) |
1432 | break; | |
1433 | ||
d4fa05b9 TS |
1434 | /* There are three things this line can be: a line of Fortran |
1435 | source, an include line or a C preprocessor directive. */ | |
6de9cd9a | 1436 | |
d4fa05b9 TS |
1437 | if (line[0] == '#') |
1438 | { | |
1439 | preprocessor_line (line); | |
1440 | continue; | |
1441 | } | |
6de9cd9a | 1442 | |
d4fa05b9 TS |
1443 | if (include_line (line)) |
1444 | { | |
1445 | current_file->line++; | |
1446 | continue; | |
6de9cd9a DN |
1447 | } |
1448 | ||
d4fa05b9 TS |
1449 | /* Add line. */ |
1450 | ||
4cdf7223 | 1451 | b = gfc_getmem (gfc_linebuf_header_size + len + 1); |
d4fa05b9 | 1452 | |
c8cc8542 PB |
1453 | #ifdef USE_MAPPED_LOCATION |
1454 | b->location | |
1455 | = linemap_line_start (&line_table, current_file->line++, 120); | |
1456 | #else | |
d4fa05b9 | 1457 | b->linenum = current_file->line++; |
c8cc8542 | 1458 | #endif |
d4fa05b9 | 1459 | b->file = current_file; |
ba1defa5 | 1460 | b->truncated = trunc; |
d4fa05b9 TS |
1461 | strcpy (b->line, line); |
1462 | ||
1463 | if (line_head == NULL) | |
1464 | line_head = b; | |
1465 | else | |
1466 | line_tail->next = b; | |
1467 | ||
1468 | line_tail = b; | |
6de9cd9a | 1469 | } |
d4fa05b9 | 1470 | |
f56c5d5d TS |
1471 | /* Release the line buffer allocated in load_line. */ |
1472 | gfc_free (line); | |
1473 | ||
d4fa05b9 TS |
1474 | fclose (input); |
1475 | ||
1476 | current_file = current_file->up; | |
c8cc8542 PB |
1477 | #ifdef USE_MAPPED_LOCATION |
1478 | linemap_add (&line_table, LC_LEAVE, 0, NULL, 0); | |
1479 | #endif | |
d4fa05b9 | 1480 | return SUCCESS; |
6de9cd9a DN |
1481 | } |
1482 | ||
1483 | ||
d4fa05b9 TS |
1484 | /* Open a new file and start scanning from that file. Returns SUCCESS |
1485 | if everything went OK, FAILURE otherwise. If form == FORM_UKNOWN | |
1486 | it tries to determine the source form from the filename, defaulting | |
1487 | to free form. */ | |
6de9cd9a DN |
1488 | |
1489 | try | |
e0bcf78c | 1490 | gfc_new_file (void) |
6de9cd9a | 1491 | { |
d4fa05b9 | 1492 | try result; |
6de9cd9a | 1493 | |
d4fa05b9 | 1494 | result = load_file (gfc_source_file, true); |
6de9cd9a | 1495 | |
63645982 TS |
1496 | gfc_current_locus.lb = line_head; |
1497 | gfc_current_locus.nextc = (line_head == NULL) ? NULL : line_head->line; | |
6de9cd9a | 1498 | |
d4fa05b9 TS |
1499 | #if 0 /* Debugging aid. */ |
1500 | for (; line_head; line_head = line_head->next) | |
1501 | gfc_status ("%s:%3d %s\n", line_head->file->filename, | |
c8cc8542 PB |
1502 | #ifdef USE_MAPPED_LOCATION |
1503 | LOCATION_LINE (line_head->location), | |
1504 | #else | |
1505 | line_head->linenum, | |
1506 | #endif | |
1507 | line_head->line); | |
6de9cd9a | 1508 | |
d4fa05b9 TS |
1509 | exit (0); |
1510 | #endif | |
6de9cd9a | 1511 | |
d4fa05b9 | 1512 | return result; |
6de9cd9a | 1513 | } |
2d7c7df6 JJ |
1514 | |
1515 | static char * | |
1516 | unescape_filename (const char *ptr) | |
1517 | { | |
1518 | const char *p = ptr, *s; | |
1519 | char *d, *ret; | |
1520 | int escaped, unescape = 0; | |
1521 | ||
1522 | /* Make filename end at quote. */ | |
1523 | escaped = false; | |
1524 | while (*p && ! (! escaped && *p == '"')) | |
1525 | { | |
1526 | if (escaped) | |
1527 | escaped = false; | |
1528 | else if (*p == '\\') | |
1529 | { | |
1530 | escaped = true; | |
1531 | unescape++; | |
1532 | } | |
1533 | ++p; | |
1534 | } | |
1535 | ||
1536 | if (! *p || p[1]) | |
1537 | return NULL; | |
1538 | ||
1539 | /* Undo effects of cpp_quote_string. */ | |
1540 | s = ptr; | |
1541 | d = gfc_getmem (p + 1 - ptr - unescape); | |
1542 | ret = d; | |
1543 | ||
1544 | while (s != p) | |
1545 | { | |
1546 | if (*s == '\\') | |
1547 | *d++ = *++s; | |
1548 | else | |
1549 | *d++ = *s; | |
1550 | s++; | |
1551 | } | |
1552 | *d = '\0'; | |
1553 | return ret; | |
1554 | } | |
1555 | ||
1556 | /* For preprocessed files, if the first tokens are of the form # NUM. | |
1557 | handle the directives so we know the original file name. */ | |
1558 | ||
1559 | const char * | |
1560 | gfc_read_orig_filename (const char *filename, const char **canon_source_file) | |
1561 | { | |
1562 | int c, len; | |
1563 | char *dirname; | |
1564 | ||
1565 | gfc_src_file = gfc_open_file (filename); | |
1566 | if (gfc_src_file == NULL) | |
1567 | return NULL; | |
1568 | ||
1569 | c = fgetc (gfc_src_file); | |
1570 | ungetc (c, gfc_src_file); | |
1571 | ||
1572 | if (c != '#') | |
1573 | return NULL; | |
1574 | ||
1575 | len = 0; | |
1576 | load_line (gfc_src_file, &gfc_src_preprocessor_lines[0], &len); | |
1577 | ||
1578 | if (strncmp (gfc_src_preprocessor_lines[0], "# 1 \"", 5) != 0) | |
1579 | return NULL; | |
1580 | ||
1581 | filename = unescape_filename (gfc_src_preprocessor_lines[0] + 5); | |
1582 | if (filename == NULL) | |
1583 | return NULL; | |
1584 | ||
1585 | c = fgetc (gfc_src_file); | |
1586 | ungetc (c, gfc_src_file); | |
1587 | ||
1588 | if (c != '#') | |
1589 | return filename; | |
1590 | ||
1591 | len = 0; | |
1592 | load_line (gfc_src_file, &gfc_src_preprocessor_lines[1], &len); | |
1593 | ||
1594 | if (strncmp (gfc_src_preprocessor_lines[1], "# 1 \"", 5) != 0) | |
1595 | return filename; | |
1596 | ||
1597 | dirname = unescape_filename (gfc_src_preprocessor_lines[1] + 5); | |
1598 | if (dirname == NULL) | |
1599 | return filename; | |
1600 | ||
1601 | len = strlen (dirname); | |
1602 | if (len < 3 || dirname[len - 1] != '/' || dirname[len - 2] != '/') | |
1603 | { | |
1604 | gfc_free (dirname); | |
1605 | return filename; | |
1606 | } | |
1607 | dirname[len - 2] = '\0'; | |
1608 | set_src_pwd (dirname); | |
1609 | ||
1610 | if (! IS_ABSOLUTE_PATH (filename)) | |
1611 | { | |
1612 | char *p = gfc_getmem (len + strlen (filename)); | |
1613 | ||
1614 | memcpy (p, dirname, len - 2); | |
1615 | p[len - 2] = '/'; | |
1616 | strcpy (p + len - 1, filename); | |
1617 | *canon_source_file = p; | |
1618 | } | |
1619 | ||
1620 | gfc_free (dirname); | |
1621 | return filename; | |
1622 | } |