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6de9cd9a | 1 | /* Character scanner. |
835aac92 | 2 | Copyright (C) 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008 |
ec378180 | 3 | Free Software Foundation, Inc. |
6de9cd9a DN |
4 | Contributed by Andy Vaught |
5 | ||
9fc4d79b | 6 | This file is part of GCC. |
6de9cd9a | 7 | |
9fc4d79b TS |
8 | GCC is free software; you can redistribute it and/or modify it under |
9 | the terms of the GNU General Public License as published by the Free | |
d234d788 | 10 | Software Foundation; either version 3, or (at your option) any later |
9fc4d79b | 11 | version. |
6de9cd9a | 12 | |
9fc4d79b TS |
13 | GCC is distributed in the hope that it will be useful, but WITHOUT ANY |
14 | WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
15 | FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
16 | for more details. | |
6de9cd9a DN |
17 | |
18 | You should have received a copy of the GNU General Public License | |
d234d788 NC |
19 | along with GCC; see the file COPYING3. If not see |
20 | <http://www.gnu.org/licenses/>. */ | |
6de9cd9a DN |
21 | |
22 | /* Set of subroutines to (ultimately) return the next character to the | |
23 | various matching subroutines. This file's job is to read files and | |
24 | build up lines that are parsed by the parser. This means that we | |
25 | handle continuation lines and "include" lines. | |
26 | ||
27 | The first thing the scanner does is to load an entire file into | |
28 | memory. We load the entire file into memory for a couple reasons. | |
29 | The first is that we want to be able to deal with nonseekable input | |
30 | (pipes, stdin) and there is a lot of backing up involved during | |
31 | parsing. | |
32 | ||
33 | The second is that we want to be able to print the locus of errors, | |
34 | and an error on line 999999 could conflict with something on line | |
35 | one. Given nonseekable input, we've got to store the whole thing. | |
36 | ||
37 | One thing that helps are the column truncation limits that give us | |
38 | an upper bound on the size of individual lines. We don't store the | |
39 | truncated stuff. | |
40 | ||
41 | From the scanner's viewpoint, the higher level subroutines ask for | |
42 | new characters and do a lot of jumping backwards. */ | |
43 | ||
44 | #include "config.h" | |
d22e4895 | 45 | #include "system.h" |
6de9cd9a | 46 | #include "gfortran.h" |
2d7c7df6 | 47 | #include "toplev.h" |
9e8a6720 FXC |
48 | #include "debug.h" |
49 | #include "flags.h" | |
6de9cd9a DN |
50 | |
51 | /* Structure for holding module and include file search path. */ | |
52 | typedef struct gfc_directorylist | |
53 | { | |
54 | char *path; | |
31198773 | 55 | bool use_for_modules; |
6de9cd9a DN |
56 | struct gfc_directorylist *next; |
57 | } | |
58 | gfc_directorylist; | |
59 | ||
60 | /* List of include file search directories. */ | |
31198773 | 61 | static gfc_directorylist *include_dirs, *intrinsic_modules_dirs; |
6de9cd9a | 62 | |
d4fa05b9 | 63 | static gfc_file *file_head, *current_file; |
6de9cd9a | 64 | |
6c7a4dfd | 65 | static int continue_flag, end_flag, openmp_flag; |
5a06474c | 66 | static int continue_count, continue_line; |
6c7a4dfd | 67 | static locus openmp_locus; |
6de9cd9a | 68 | |
d4fa05b9 TS |
69 | gfc_source_form gfc_current_form; |
70 | static gfc_linebuf *line_head, *line_tail; | |
71 | ||
63645982 | 72 | locus gfc_current_locus; |
e0bcf78c | 73 | const char *gfc_source_file; |
2d7c7df6 | 74 | static FILE *gfc_src_file; |
8fc541d3 | 75 | static gfc_char_t *gfc_src_preprocessor_lines[2]; |
2d7c7df6 | 76 | |
5a06474c | 77 | extern int pedantic; |
6de9cd9a | 78 | |
1b271c9b JJ |
79 | static struct gfc_file_change |
80 | { | |
81 | const char *filename; | |
82 | gfc_linebuf *lb; | |
83 | int line; | |
84 | } *file_changes; | |
85 | size_t file_changes_cur, file_changes_count; | |
86 | size_t file_changes_allocated; | |
87 | ||
8fc541d3 FXC |
88 | |
89 | /* Functions dealing with our wide characters (gfc_char_t) and | |
90 | sequences of such characters. */ | |
91 | ||
92 | int | |
93 | gfc_wide_fits_in_byte (gfc_char_t c) | |
94 | { | |
95 | return (c <= UCHAR_MAX); | |
96 | } | |
97 | ||
98 | static inline int | |
99 | wide_is_ascii (gfc_char_t c) | |
100 | { | |
101 | return (gfc_wide_fits_in_byte (c) && ((unsigned char) c & ~0x7f) == 0); | |
102 | } | |
103 | ||
104 | int | |
105 | gfc_wide_is_printable (gfc_char_t c) | |
106 | { | |
107 | return (gfc_wide_fits_in_byte (c) && ISPRINT ((unsigned char) c)); | |
108 | } | |
109 | ||
110 | gfc_char_t | |
111 | gfc_wide_tolower (gfc_char_t c) | |
112 | { | |
113 | return (wide_is_ascii (c) ? (gfc_char_t) TOLOWER((unsigned char) c) : c); | |
114 | } | |
115 | ||
116 | int | |
117 | gfc_wide_is_digit (gfc_char_t c) | |
118 | { | |
119 | return (c >= '0' && c <= '9'); | |
120 | } | |
121 | ||
122 | static inline int | |
123 | wide_atoi (gfc_char_t *c) | |
124 | { | |
125 | #define MAX_DIGITS 20 | |
126 | char buf[MAX_DIGITS+1]; | |
127 | int i = 0; | |
128 | ||
129 | while (gfc_wide_is_digit(*c) && i < MAX_DIGITS) | |
130 | buf[i++] = *c++; | |
131 | buf[i] = '\0'; | |
132 | return atoi (buf); | |
133 | } | |
134 | ||
135 | size_t | |
136 | gfc_wide_strlen (const gfc_char_t *str) | |
137 | { | |
138 | size_t i; | |
139 | ||
140 | for (i = 0; str[i]; i++) | |
141 | ; | |
142 | ||
143 | return i; | |
144 | } | |
145 | ||
146 | static gfc_char_t * | |
147 | wide_strcpy (gfc_char_t *dest, const gfc_char_t *src) | |
148 | { | |
149 | gfc_char_t *d; | |
150 | ||
151 | for (d = dest; (*d = *src) != '\0'; ++src, ++d) | |
152 | ; | |
153 | ||
154 | return dest; | |
155 | } | |
156 | ||
157 | static gfc_char_t * | |
158 | wide_strchr (gfc_char_t *s, gfc_char_t c) | |
159 | { | |
160 | do { | |
161 | if (*s == c) | |
162 | { | |
163 | return (gfc_char_t *) s; | |
164 | } | |
165 | } while (*s++); | |
166 | return 0; | |
167 | } | |
168 | ||
169 | static char * | |
170 | widechar_to_char (gfc_char_t *s) | |
171 | { | |
172 | size_t len = gfc_wide_strlen (s), i; | |
173 | char *res = gfc_getmem (len + 1); | |
174 | ||
175 | for (i = 0; i < len; i++) | |
176 | res[i] = gfc_wide_fits_in_byte (s[i]) ? (unsigned char) s[i] : '?'; | |
177 | ||
178 | res[len] = '\0'; | |
179 | return res; | |
180 | } | |
181 | ||
182 | static int | |
183 | wide_strncmp (const gfc_char_t *s1, const char *s2, size_t n) | |
184 | { | |
185 | gfc_char_t c1, c2; | |
186 | ||
187 | while (n-- > 0) | |
188 | { | |
189 | c1 = *s1++; | |
190 | c2 = *s2++; | |
191 | if (c1 != c2) | |
192 | return (c1 > c2 ? 1 : -1); | |
193 | if (c1 == '\0') | |
194 | return 0; | |
195 | } | |
196 | return 0; | |
197 | } | |
198 | ||
199 | static int | |
200 | wide_strncasecmp (const gfc_char_t *s1, const char *s2, size_t n) | |
201 | { | |
202 | gfc_char_t c1, c2; | |
203 | ||
204 | while (n-- > 0) | |
205 | { | |
206 | c1 = gfc_wide_tolower (*s1++); | |
207 | c2 = TOLOWER (*s2++); | |
208 | if (c1 != c2) | |
209 | return (c1 > c2 ? 1 : -1); | |
210 | if (c1 == '\0') | |
211 | return 0; | |
212 | } | |
213 | return 0; | |
214 | } | |
215 | ||
216 | ||
6de9cd9a DN |
217 | /* Main scanner initialization. */ |
218 | ||
219 | void | |
220 | gfc_scanner_init_1 (void) | |
221 | { | |
d4fa05b9 TS |
222 | file_head = NULL; |
223 | line_head = NULL; | |
224 | line_tail = NULL; | |
6de9cd9a | 225 | |
5a06474c JD |
226 | continue_count = 0; |
227 | continue_line = 0; | |
228 | ||
6de9cd9a DN |
229 | end_flag = 0; |
230 | } | |
231 | ||
232 | ||
233 | /* Main scanner destructor. */ | |
234 | ||
235 | void | |
236 | gfc_scanner_done_1 (void) | |
237 | { | |
d4fa05b9 TS |
238 | gfc_linebuf *lb; |
239 | gfc_file *f; | |
6de9cd9a | 240 | |
d4fa05b9 | 241 | while(line_head != NULL) |
6de9cd9a | 242 | { |
d4fa05b9 TS |
243 | lb = line_head->next; |
244 | gfc_free(line_head); | |
245 | line_head = lb; | |
6de9cd9a | 246 | } |
d4fa05b9 TS |
247 | |
248 | while(file_head != NULL) | |
6de9cd9a | 249 | { |
d4fa05b9 TS |
250 | f = file_head->next; |
251 | gfc_free(file_head->filename); | |
252 | gfc_free(file_head); | |
253 | file_head = f; | |
6de9cd9a DN |
254 | } |
255 | } | |
256 | ||
257 | ||
258 | /* Adds path to the list pointed to by list. */ | |
259 | ||
31198773 FXC |
260 | static void |
261 | add_path_to_list (gfc_directorylist **list, const char *path, | |
262 | bool use_for_modules) | |
6de9cd9a DN |
263 | { |
264 | gfc_directorylist *dir; | |
265 | const char *p; | |
266 | ||
267 | p = path; | |
31198773 | 268 | while (*p == ' ' || *p == '\t') /* someone might do "-I include" */ |
6de9cd9a DN |
269 | if (*p++ == '\0') |
270 | return; | |
271 | ||
31198773 | 272 | dir = *list; |
6de9cd9a | 273 | if (!dir) |
31198773 | 274 | dir = *list = gfc_getmem (sizeof (gfc_directorylist)); |
6de9cd9a DN |
275 | else |
276 | { | |
277 | while (dir->next) | |
278 | dir = dir->next; | |
279 | ||
280 | dir->next = gfc_getmem (sizeof (gfc_directorylist)); | |
281 | dir = dir->next; | |
282 | } | |
283 | ||
284 | dir->next = NULL; | |
31198773 | 285 | dir->use_for_modules = use_for_modules; |
6de9cd9a DN |
286 | dir->path = gfc_getmem (strlen (p) + 2); |
287 | strcpy (dir->path, p); | |
288 | strcat (dir->path, "/"); /* make '/' last character */ | |
289 | } | |
290 | ||
291 | ||
31198773 FXC |
292 | void |
293 | gfc_add_include_path (const char *path, bool use_for_modules) | |
294 | { | |
295 | add_path_to_list (&include_dirs, path, use_for_modules); | |
296 | } | |
297 | ||
298 | ||
299 | void | |
300 | gfc_add_intrinsic_modules_path (const char *path) | |
301 | { | |
302 | add_path_to_list (&intrinsic_modules_dirs, path, true); | |
303 | } | |
304 | ||
305 | ||
6de9cd9a DN |
306 | /* Release resources allocated for options. */ |
307 | ||
308 | void | |
309 | gfc_release_include_path (void) | |
310 | { | |
311 | gfc_directorylist *p; | |
312 | ||
6de9cd9a DN |
313 | while (include_dirs != NULL) |
314 | { | |
315 | p = include_dirs; | |
316 | include_dirs = include_dirs->next; | |
317 | gfc_free (p->path); | |
318 | gfc_free (p); | |
319 | } | |
31198773 | 320 | |
31198773 FXC |
321 | while (intrinsic_modules_dirs != NULL) |
322 | { | |
323 | p = intrinsic_modules_dirs; | |
324 | intrinsic_modules_dirs = intrinsic_modules_dirs->next; | |
325 | gfc_free (p->path); | |
326 | gfc_free (p); | |
327 | } | |
1bc23383 FXC |
328 | |
329 | gfc_free (gfc_option.module_dir); | |
6de9cd9a DN |
330 | } |
331 | ||
6de9cd9a | 332 | |
31198773 FXC |
333 | static FILE * |
334 | open_included_file (const char *name, gfc_directorylist *list, bool module) | |
6de9cd9a | 335 | { |
200cfbe7 | 336 | char *fullname; |
6de9cd9a DN |
337 | gfc_directorylist *p; |
338 | FILE *f; | |
339 | ||
31198773 | 340 | for (p = list; p; p = p->next) |
b424a572 | 341 | { |
31198773 FXC |
342 | if (module && !p->use_for_modules) |
343 | continue; | |
6de9cd9a | 344 | |
200cfbe7 | 345 | fullname = (char *) alloca(strlen (p->path) + strlen (name) + 1); |
6de9cd9a DN |
346 | strcpy (fullname, p->path); |
347 | strcat (fullname, name); | |
348 | ||
349 | f = gfc_open_file (fullname); | |
350 | if (f != NULL) | |
351 | return f; | |
352 | } | |
353 | ||
354 | return NULL; | |
355 | } | |
356 | ||
31198773 FXC |
357 | |
358 | /* Opens file for reading, searching through the include directories | |
359 | given if necessary. If the include_cwd argument is true, we try | |
360 | to open the file in the current directory first. */ | |
361 | ||
362 | FILE * | |
363 | gfc_open_included_file (const char *name, bool include_cwd, bool module) | |
364 | { | |
365 | FILE *f; | |
366 | ||
e01f74e0 TB |
367 | if (IS_ABSOLUTE_PATH (name)) |
368 | return gfc_open_file (name); | |
369 | ||
31198773 FXC |
370 | if (include_cwd) |
371 | { | |
372 | f = gfc_open_file (name); | |
373 | if (f != NULL) | |
374 | return f; | |
375 | } | |
376 | ||
377 | return open_included_file (name, include_dirs, module); | |
378 | } | |
379 | ||
380 | FILE * | |
381 | gfc_open_intrinsic_module (const char *name) | |
382 | { | |
e01f74e0 TB |
383 | if (IS_ABSOLUTE_PATH (name)) |
384 | return gfc_open_file (name); | |
385 | ||
31198773 FXC |
386 | return open_included_file (name, intrinsic_modules_dirs, true); |
387 | } | |
388 | ||
edf1eac2 | 389 | |
6de9cd9a DN |
390 | /* Test to see if we're at the end of the main source file. */ |
391 | ||
392 | int | |
393 | gfc_at_end (void) | |
394 | { | |
6de9cd9a DN |
395 | return end_flag; |
396 | } | |
397 | ||
398 | ||
399 | /* Test to see if we're at the end of the current file. */ | |
400 | ||
401 | int | |
402 | gfc_at_eof (void) | |
403 | { | |
6de9cd9a DN |
404 | if (gfc_at_end ()) |
405 | return 1; | |
406 | ||
d4fa05b9 | 407 | if (line_head == NULL) |
6de9cd9a DN |
408 | return 1; /* Null file */ |
409 | ||
63645982 | 410 | if (gfc_current_locus.lb == NULL) |
6de9cd9a DN |
411 | return 1; |
412 | ||
413 | return 0; | |
414 | } | |
415 | ||
416 | ||
417 | /* Test to see if we're at the beginning of a new line. */ | |
418 | ||
419 | int | |
420 | gfc_at_bol (void) | |
421 | { | |
6de9cd9a DN |
422 | if (gfc_at_eof ()) |
423 | return 1; | |
424 | ||
63645982 | 425 | return (gfc_current_locus.nextc == gfc_current_locus.lb->line); |
6de9cd9a DN |
426 | } |
427 | ||
428 | ||
429 | /* Test to see if we're at the end of a line. */ | |
430 | ||
431 | int | |
432 | gfc_at_eol (void) | |
433 | { | |
6de9cd9a DN |
434 | if (gfc_at_eof ()) |
435 | return 1; | |
436 | ||
63645982 | 437 | return (*gfc_current_locus.nextc == '\0'); |
6de9cd9a DN |
438 | } |
439 | ||
60332588 | 440 | static void |
1b271c9b | 441 | add_file_change (const char *filename, int line) |
60332588 | 442 | { |
1b271c9b JJ |
443 | if (file_changes_count == file_changes_allocated) |
444 | { | |
445 | if (file_changes_allocated) | |
446 | file_changes_allocated *= 2; | |
447 | else | |
448 | file_changes_allocated = 16; | |
449 | file_changes | |
450 | = xrealloc (file_changes, | |
451 | file_changes_allocated * sizeof (*file_changes)); | |
452 | } | |
453 | file_changes[file_changes_count].filename = filename; | |
454 | file_changes[file_changes_count].lb = NULL; | |
455 | file_changes[file_changes_count++].line = line; | |
456 | } | |
60332588 | 457 | |
1b271c9b JJ |
458 | static void |
459 | report_file_change (gfc_linebuf *lb) | |
460 | { | |
461 | size_t c = file_changes_cur; | |
462 | while (c < file_changes_count | |
463 | && file_changes[c].lb == lb) | |
464 | { | |
465 | if (file_changes[c].filename) | |
466 | (*debug_hooks->start_source_file) (file_changes[c].line, | |
467 | file_changes[c].filename); | |
468 | else | |
469 | (*debug_hooks->end_source_file) (file_changes[c].line); | |
470 | ++c; | |
471 | } | |
472 | file_changes_cur = c; | |
60332588 JJ |
473 | } |
474 | ||
475 | void | |
476 | gfc_start_source_files (void) | |
477 | { | |
478 | /* If the debugger wants the name of the main source file, | |
479 | we give it. */ | |
480 | if (debug_hooks->start_end_main_source_file) | |
481 | (*debug_hooks->start_source_file) (0, gfc_source_file); | |
482 | ||
1b271c9b JJ |
483 | file_changes_cur = 0; |
484 | report_file_change (gfc_current_locus.lb); | |
60332588 JJ |
485 | } |
486 | ||
487 | void | |
488 | gfc_end_source_files (void) | |
489 | { | |
1b271c9b | 490 | report_file_change (NULL); |
60332588 JJ |
491 | |
492 | if (debug_hooks->start_end_main_source_file) | |
493 | (*debug_hooks->end_source_file) (0); | |
494 | } | |
6de9cd9a DN |
495 | |
496 | /* Advance the current line pointer to the next line. */ | |
497 | ||
498 | void | |
499 | gfc_advance_line (void) | |
500 | { | |
6de9cd9a | 501 | if (gfc_at_end ()) |
4a58b9ad | 502 | return; |
6de9cd9a | 503 | |
63645982 | 504 | if (gfc_current_locus.lb == NULL) |
6de9cd9a | 505 | { |
d4fa05b9 TS |
506 | end_flag = 1; |
507 | return; | |
508 | } | |
6de9cd9a | 509 | |
9e8a6720 | 510 | if (gfc_current_locus.lb->next |
60332588 | 511 | && !gfc_current_locus.lb->next->dbg_emitted) |
9e8a6720 | 512 | { |
1b271c9b | 513 | report_file_change (gfc_current_locus.lb->next); |
60332588 | 514 | gfc_current_locus.lb->next->dbg_emitted = true; |
9e8a6720 FXC |
515 | } |
516 | ||
63645982 | 517 | gfc_current_locus.lb = gfc_current_locus.lb->next; |
6de9cd9a | 518 | |
edf1eac2 | 519 | if (gfc_current_locus.lb != NULL) |
63645982 | 520 | gfc_current_locus.nextc = gfc_current_locus.lb->line; |
d4fa05b9 TS |
521 | else |
522 | { | |
63645982 | 523 | gfc_current_locus.nextc = NULL; |
d4fa05b9 TS |
524 | end_flag = 1; |
525 | } | |
6de9cd9a DN |
526 | } |
527 | ||
528 | ||
529 | /* Get the next character from the input, advancing gfc_current_file's | |
530 | locus. When we hit the end of the line or the end of the file, we | |
531 | start returning a '\n' in order to complete the current statement. | |
532 | No Fortran line conventions are implemented here. | |
533 | ||
534 | Requiring explicit advances to the next line prevents the parse | |
535 | pointer from being on the wrong line if the current statement ends | |
536 | prematurely. */ | |
537 | ||
8fc541d3 | 538 | static gfc_char_t |
6de9cd9a DN |
539 | next_char (void) |
540 | { | |
8fc541d3 | 541 | gfc_char_t c; |
d4fa05b9 | 542 | |
63645982 | 543 | if (gfc_current_locus.nextc == NULL) |
6de9cd9a DN |
544 | return '\n'; |
545 | ||
8fc541d3 | 546 | c = *gfc_current_locus.nextc++; |
6de9cd9a DN |
547 | if (c == '\0') |
548 | { | |
63645982 | 549 | gfc_current_locus.nextc--; /* Remain on this line. */ |
6de9cd9a DN |
550 | c = '\n'; |
551 | } | |
552 | ||
553 | return c; | |
554 | } | |
555 | ||
edf1eac2 | 556 | |
6de9cd9a DN |
557 | /* Skip a comment. When we come here the parse pointer is positioned |
558 | immediately after the comment character. If we ever implement | |
559 | compiler directives withing comments, here is where we parse the | |
560 | directive. */ | |
561 | ||
562 | static void | |
563 | skip_comment_line (void) | |
564 | { | |
8fc541d3 | 565 | gfc_char_t c; |
6de9cd9a DN |
566 | |
567 | do | |
568 | { | |
569 | c = next_char (); | |
570 | } | |
571 | while (c != '\n'); | |
572 | ||
573 | gfc_advance_line (); | |
574 | } | |
575 | ||
576 | ||
9e8a6720 FXC |
577 | int |
578 | gfc_define_undef_line (void) | |
579 | { | |
8fc541d3 FXC |
580 | char *tmp; |
581 | ||
9e8a6720 | 582 | /* All lines beginning with '#' are either #define or #undef. */ |
8fc541d3 | 583 | if (debug_info_level != DINFO_LEVEL_VERBOSE || gfc_peek_ascii_char () != '#') |
9e8a6720 FXC |
584 | return 0; |
585 | ||
8fc541d3 FXC |
586 | if (wide_strncmp (gfc_current_locus.nextc, "#define ", 8) == 0) |
587 | { | |
588 | tmp = widechar_to_char (&gfc_current_locus.nextc[8]); | |
589 | (*debug_hooks->define) (gfc_linebuf_linenum (gfc_current_locus.lb), | |
590 | tmp); | |
591 | gfc_free (tmp); | |
592 | } | |
9e8a6720 | 593 | |
8fc541d3 FXC |
594 | if (wide_strncmp (gfc_current_locus.nextc, "#undef ", 7) == 0) |
595 | { | |
596 | tmp = widechar_to_char (&gfc_current_locus.nextc[7]); | |
597 | (*debug_hooks->undef) (gfc_linebuf_linenum (gfc_current_locus.lb), | |
598 | tmp); | |
599 | gfc_free (tmp); | |
600 | } | |
9e8a6720 FXC |
601 | |
602 | /* Skip the rest of the line. */ | |
603 | skip_comment_line (); | |
604 | ||
605 | return 1; | |
606 | } | |
607 | ||
608 | ||
6de9cd9a | 609 | /* Comment lines are null lines, lines containing only blanks or lines |
0d3abf6f JJ |
610 | on which the first nonblank line is a '!'. |
611 | Return true if !$ openmp conditional compilation sentinel was | |
612 | seen. */ | |
6de9cd9a | 613 | |
0d3abf6f | 614 | static bool |
6de9cd9a DN |
615 | skip_free_comments (void) |
616 | { | |
617 | locus start; | |
8fc541d3 | 618 | gfc_char_t c; |
6c7a4dfd | 619 | int at_bol; |
6de9cd9a DN |
620 | |
621 | for (;;) | |
622 | { | |
6c7a4dfd | 623 | at_bol = gfc_at_bol (); |
63645982 | 624 | start = gfc_current_locus; |
6de9cd9a DN |
625 | if (gfc_at_eof ()) |
626 | break; | |
627 | ||
628 | do | |
6c7a4dfd | 629 | c = next_char (); |
6de9cd9a DN |
630 | while (gfc_is_whitespace (c)); |
631 | ||
632 | if (c == '\n') | |
633 | { | |
634 | gfc_advance_line (); | |
635 | continue; | |
636 | } | |
637 | ||
638 | if (c == '!') | |
639 | { | |
6c7a4dfd JJ |
640 | /* If -fopenmp, we need to handle here 2 things: |
641 | 1) don't treat !$omp as comments, but directives | |
642 | 2) handle OpenMP conditional compilation, where | |
643 | !$ should be treated as 2 spaces (for initial lines | |
644 | only if followed by space). */ | |
645 | if (gfc_option.flag_openmp && at_bol) | |
646 | { | |
647 | locus old_loc = gfc_current_locus; | |
648 | if (next_char () == '$') | |
649 | { | |
650 | c = next_char (); | |
651 | if (c == 'o' || c == 'O') | |
652 | { | |
653 | if (((c = next_char ()) == 'm' || c == 'M') | |
9fa6cfec | 654 | && ((c = next_char ()) == 'p' || c == 'P')) |
6c7a4dfd | 655 | { |
9fa6cfec | 656 | if ((c = next_char ()) == ' ' || continue_flag) |
6c7a4dfd | 657 | { |
9fa6cfec TB |
658 | while (gfc_is_whitespace (c)) |
659 | c = next_char (); | |
660 | if (c != '\n' && c != '!') | |
661 | { | |
662 | openmp_flag = 1; | |
663 | openmp_locus = old_loc; | |
664 | gfc_current_locus = start; | |
665 | return false; | |
666 | } | |
6c7a4dfd | 667 | } |
9fa6cfec TB |
668 | else |
669 | gfc_warning_now ("!$OMP at %C starts a commented " | |
670 | "line as it neither is followed " | |
671 | "by a space nor is a " | |
672 | "continuation line"); | |
6c7a4dfd JJ |
673 | } |
674 | gfc_current_locus = old_loc; | |
675 | next_char (); | |
676 | c = next_char (); | |
677 | } | |
678 | if (continue_flag || c == ' ') | |
679 | { | |
680 | gfc_current_locus = old_loc; | |
681 | next_char (); | |
b30c6a0d | 682 | openmp_flag = 0; |
0d3abf6f | 683 | return true; |
6c7a4dfd JJ |
684 | } |
685 | } | |
686 | gfc_current_locus = old_loc; | |
687 | } | |
6de9cd9a DN |
688 | skip_comment_line (); |
689 | continue; | |
690 | } | |
691 | ||
692 | break; | |
693 | } | |
694 | ||
6c7a4dfd JJ |
695 | if (openmp_flag && at_bol) |
696 | openmp_flag = 0; | |
63645982 | 697 | gfc_current_locus = start; |
0d3abf6f | 698 | return false; |
6de9cd9a DN |
699 | } |
700 | ||
701 | ||
702 | /* Skip comment lines in fixed source mode. We have the same rules as | |
703 | in skip_free_comment(), except that we can have a 'c', 'C' or '*' | |
e0bcf78c TS |
704 | in column 1, and a '!' cannot be in column 6. Also, we deal with |
705 | lines with 'd' or 'D' in column 1, if the user requested this. */ | |
6de9cd9a DN |
706 | |
707 | static void | |
708 | skip_fixed_comments (void) | |
709 | { | |
710 | locus start; | |
711 | int col; | |
8fc541d3 | 712 | gfc_char_t c; |
6de9cd9a | 713 | |
6c7a4dfd JJ |
714 | if (! gfc_at_bol ()) |
715 | { | |
716 | start = gfc_current_locus; | |
717 | if (! gfc_at_eof ()) | |
718 | { | |
719 | do | |
720 | c = next_char (); | |
721 | while (gfc_is_whitespace (c)); | |
722 | ||
723 | if (c == '\n') | |
724 | gfc_advance_line (); | |
725 | else if (c == '!') | |
726 | skip_comment_line (); | |
727 | } | |
728 | ||
729 | if (! gfc_at_bol ()) | |
730 | { | |
731 | gfc_current_locus = start; | |
732 | return; | |
733 | } | |
734 | } | |
735 | ||
6de9cd9a DN |
736 | for (;;) |
737 | { | |
63645982 | 738 | start = gfc_current_locus; |
6de9cd9a DN |
739 | if (gfc_at_eof ()) |
740 | break; | |
741 | ||
742 | c = next_char (); | |
743 | if (c == '\n') | |
744 | { | |
745 | gfc_advance_line (); | |
746 | continue; | |
747 | } | |
748 | ||
749 | if (c == '!' || c == 'c' || c == 'C' || c == '*') | |
750 | { | |
6c7a4dfd JJ |
751 | /* If -fopenmp, we need to handle here 2 things: |
752 | 1) don't treat !$omp|c$omp|*$omp as comments, but directives | |
753 | 2) handle OpenMP conditional compilation, where | |
754 | !$|c$|*$ should be treated as 2 spaces if the characters | |
755 | in columns 3 to 6 are valid fixed form label columns | |
756 | characters. */ | |
f449022d JD |
757 | if (gfc_current_locus.lb != NULL |
758 | && continue_line < gfc_linebuf_linenum (gfc_current_locus.lb)) | |
759 | continue_line = gfc_linebuf_linenum (gfc_current_locus.lb); | |
760 | ||
6c7a4dfd JJ |
761 | if (gfc_option.flag_openmp) |
762 | { | |
763 | if (next_char () == '$') | |
764 | { | |
765 | c = next_char (); | |
766 | if (c == 'o' || c == 'O') | |
767 | { | |
768 | if (((c = next_char ()) == 'm' || c == 'M') | |
769 | && ((c = next_char ()) == 'p' || c == 'P')) | |
770 | { | |
771 | c = next_char (); | |
772 | if (c != '\n' | |
773 | && ((openmp_flag && continue_flag) | |
774 | || c == ' ' || c == '0')) | |
775 | { | |
776 | c = next_char (); | |
777 | while (gfc_is_whitespace (c)) | |
778 | c = next_char (); | |
779 | if (c != '\n' && c != '!') | |
780 | { | |
781 | /* Canonicalize to *$omp. */ | |
782 | *start.nextc = '*'; | |
783 | openmp_flag = 1; | |
784 | gfc_current_locus = start; | |
785 | return; | |
786 | } | |
787 | } | |
788 | } | |
789 | } | |
790 | else | |
791 | { | |
792 | int digit_seen = 0; | |
793 | ||
794 | for (col = 3; col < 6; col++, c = next_char ()) | |
795 | if (c == ' ') | |
796 | continue; | |
797 | else if (c < '0' || c > '9') | |
798 | break; | |
799 | else | |
800 | digit_seen = 1; | |
801 | ||
802 | if (col == 6 && c != '\n' | |
803 | && ((continue_flag && !digit_seen) | |
804 | || c == ' ' || c == '0')) | |
805 | { | |
806 | gfc_current_locus = start; | |
807 | start.nextc[0] = ' '; | |
808 | start.nextc[1] = ' '; | |
809 | continue; | |
810 | } | |
811 | } | |
812 | } | |
813 | gfc_current_locus = start; | |
814 | } | |
6de9cd9a DN |
815 | skip_comment_line (); |
816 | continue; | |
817 | } | |
818 | ||
e0bcf78c TS |
819 | if (gfc_option.flag_d_lines != -1 && (c == 'd' || c == 'D')) |
820 | { | |
821 | if (gfc_option.flag_d_lines == 0) | |
822 | { | |
823 | skip_comment_line (); | |
824 | continue; | |
825 | } | |
826 | else | |
827 | *start.nextc = c = ' '; | |
828 | } | |
829 | ||
6de9cd9a | 830 | col = 1; |
e0bcf78c TS |
831 | |
832 | while (gfc_is_whitespace (c)) | |
6de9cd9a DN |
833 | { |
834 | c = next_char (); | |
835 | col++; | |
836 | } | |
6de9cd9a DN |
837 | |
838 | if (c == '\n') | |
839 | { | |
840 | gfc_advance_line (); | |
841 | continue; | |
842 | } | |
843 | ||
844 | if (col != 6 && c == '!') | |
845 | { | |
f449022d JD |
846 | if (gfc_current_locus.lb != NULL |
847 | && continue_line < gfc_linebuf_linenum (gfc_current_locus.lb)) | |
848 | continue_line = gfc_linebuf_linenum (gfc_current_locus.lb); | |
6de9cd9a DN |
849 | skip_comment_line (); |
850 | continue; | |
851 | } | |
852 | ||
853 | break; | |
854 | } | |
855 | ||
6c7a4dfd | 856 | openmp_flag = 0; |
63645982 | 857 | gfc_current_locus = start; |
6de9cd9a DN |
858 | } |
859 | ||
860 | ||
6c7a4dfd | 861 | /* Skips the current line if it is a comment. */ |
6de9cd9a DN |
862 | |
863 | void | |
864 | gfc_skip_comments (void) | |
865 | { | |
6c7a4dfd | 866 | if (gfc_current_form == FORM_FREE) |
6de9cd9a DN |
867 | skip_free_comments (); |
868 | else | |
869 | skip_fixed_comments (); | |
870 | } | |
871 | ||
872 | ||
873 | /* Get the next character from the input, taking continuation lines | |
874 | and end-of-line comments into account. This implies that comment | |
875 | lines between continued lines must be eaten here. For higher-level | |
876 | subroutines, this flattens continued lines into a single logical | |
877 | line. The in_string flag denotes whether we're inside a character | |
878 | context or not. */ | |
879 | ||
8fc541d3 | 880 | gfc_char_t |
6de9cd9a DN |
881 | gfc_next_char_literal (int in_string) |
882 | { | |
883 | locus old_loc; | |
8fc541d3 FXC |
884 | int i, prev_openmp_flag; |
885 | gfc_char_t c; | |
6de9cd9a DN |
886 | |
887 | continue_flag = 0; | |
888 | ||
889 | restart: | |
890 | c = next_char (); | |
891 | if (gfc_at_end ()) | |
5a06474c JD |
892 | { |
893 | continue_count = 0; | |
894 | return c; | |
895 | } | |
6de9cd9a | 896 | |
d4fa05b9 | 897 | if (gfc_current_form == FORM_FREE) |
6de9cd9a | 898 | { |
0d3abf6f JJ |
899 | bool openmp_cond_flag; |
900 | ||
6de9cd9a DN |
901 | if (!in_string && c == '!') |
902 | { | |
6c7a4dfd JJ |
903 | if (openmp_flag |
904 | && memcmp (&gfc_current_locus, &openmp_locus, | |
905 | sizeof (gfc_current_locus)) == 0) | |
906 | goto done; | |
907 | ||
6de9cd9a DN |
908 | /* This line can't be continued */ |
909 | do | |
910 | { | |
911 | c = next_char (); | |
912 | } | |
913 | while (c != '\n'); | |
914 | ||
a34938be RG |
915 | /* Avoid truncation warnings for comment ending lines. */ |
916 | gfc_current_locus.lb->truncated = 0; | |
917 | ||
6de9cd9a DN |
918 | goto done; |
919 | } | |
920 | ||
921 | if (c != '&') | |
922 | goto done; | |
923 | ||
924 | /* If the next nonblank character is a ! or \n, we've got a | |
6c7a4dfd | 925 | continuation line. */ |
63645982 | 926 | old_loc = gfc_current_locus; |
6de9cd9a DN |
927 | |
928 | c = next_char (); | |
929 | while (gfc_is_whitespace (c)) | |
930 | c = next_char (); | |
931 | ||
932 | /* Character constants to be continued cannot have commentary | |
6c7a4dfd | 933 | after the '&'. */ |
6de9cd9a DN |
934 | |
935 | if (in_string && c != '\n') | |
936 | { | |
63645982 | 937 | gfc_current_locus = old_loc; |
6de9cd9a DN |
938 | c = '&'; |
939 | goto done; | |
940 | } | |
941 | ||
942 | if (c != '!' && c != '\n') | |
943 | { | |
63645982 | 944 | gfc_current_locus = old_loc; |
6de9cd9a DN |
945 | c = '&'; |
946 | goto done; | |
947 | } | |
948 | ||
6c7a4dfd | 949 | prev_openmp_flag = openmp_flag; |
6de9cd9a DN |
950 | continue_flag = 1; |
951 | if (c == '!') | |
952 | skip_comment_line (); | |
953 | else | |
954 | gfc_advance_line (); | |
0267ffdc JD |
955 | |
956 | if (gfc_at_eof()) | |
957 | goto not_continuation; | |
6de9cd9a | 958 | |
5a06474c JD |
959 | /* We've got a continuation line. If we are on the very next line after |
960 | the last continuation, increment the continuation line count and | |
961 | check whether the limit has been exceeded. */ | |
5ffeb913 | 962 | if (gfc_linebuf_linenum (gfc_current_locus.lb) == continue_line + 1) |
5a06474c JD |
963 | { |
964 | if (++continue_count == gfc_option.max_continue_free) | |
965 | { | |
edf1eac2 SK |
966 | if (gfc_notification_std (GFC_STD_GNU) || pedantic) |
967 | gfc_warning ("Limit of %d continuations exceeded in " | |
968 | "statement at %C", gfc_option.max_continue_free); | |
5a06474c JD |
969 | } |
970 | } | |
5a06474c JD |
971 | |
972 | /* Now find where it continues. First eat any comment lines. */ | |
0d3abf6f | 973 | openmp_cond_flag = skip_free_comments (); |
6de9cd9a | 974 | |
f449022d JD |
975 | if (gfc_current_locus.lb != NULL |
976 | && continue_line < gfc_linebuf_linenum (gfc_current_locus.lb)) | |
977 | continue_line = gfc_linebuf_linenum (gfc_current_locus.lb); | |
978 | ||
6c7a4dfd JJ |
979 | if (prev_openmp_flag != openmp_flag) |
980 | { | |
981 | gfc_current_locus = old_loc; | |
982 | openmp_flag = prev_openmp_flag; | |
983 | c = '&'; | |
984 | goto done; | |
985 | } | |
986 | ||
6de9cd9a | 987 | /* Now that we have a non-comment line, probe ahead for the |
6c7a4dfd JJ |
988 | first non-whitespace character. If it is another '&', then |
989 | reading starts at the next character, otherwise we must back | |
990 | up to where the whitespace started and resume from there. */ | |
6de9cd9a | 991 | |
63645982 | 992 | old_loc = gfc_current_locus; |
6de9cd9a DN |
993 | |
994 | c = next_char (); | |
995 | while (gfc_is_whitespace (c)) | |
996 | c = next_char (); | |
997 | ||
6c7a4dfd JJ |
998 | if (openmp_flag) |
999 | { | |
1000 | for (i = 0; i < 5; i++, c = next_char ()) | |
1001 | { | |
8fc541d3 | 1002 | gcc_assert (gfc_wide_tolower (c) == (unsigned char) "!$omp"[i]); |
6c7a4dfd JJ |
1003 | if (i == 4) |
1004 | old_loc = gfc_current_locus; | |
1005 | } | |
1006 | while (gfc_is_whitespace (c)) | |
1007 | c = next_char (); | |
1008 | } | |
1009 | ||
6de9cd9a | 1010 | if (c != '&') |
3fbab549 | 1011 | { |
5a06474c JD |
1012 | if (in_string) |
1013 | { | |
1014 | if (gfc_option.warn_ampersand) | |
edf1eac2 SK |
1015 | gfc_warning_now ("Missing '&' in continued character " |
1016 | "constant at %C"); | |
5a06474c JD |
1017 | gfc_current_locus.nextc--; |
1018 | } | |
0d3abf6f JJ |
1019 | /* Both !$omp and !$ -fopenmp continuation lines have & on the |
1020 | continuation line only optionally. */ | |
1021 | else if (openmp_flag || openmp_cond_flag) | |
1022 | gfc_current_locus.nextc--; | |
5a06474c JD |
1023 | else |
1024 | { | |
1025 | c = ' '; | |
1026 | gfc_current_locus = old_loc; | |
1027 | goto done; | |
1028 | } | |
3fbab549 | 1029 | } |
6de9cd9a DN |
1030 | } |
1031 | else | |
1032 | { | |
1033 | /* Fixed form continuation. */ | |
1034 | if (!in_string && c == '!') | |
1035 | { | |
1036 | /* Skip comment at end of line. */ | |
1037 | do | |
1038 | { | |
1039 | c = next_char (); | |
1040 | } | |
1041 | while (c != '\n'); | |
a34938be RG |
1042 | |
1043 | /* Avoid truncation warnings for comment ending lines. */ | |
1044 | gfc_current_locus.lb->truncated = 0; | |
6de9cd9a DN |
1045 | } |
1046 | ||
1047 | if (c != '\n') | |
1048 | goto done; | |
1049 | ||
6c7a4dfd | 1050 | prev_openmp_flag = openmp_flag; |
6de9cd9a | 1051 | continue_flag = 1; |
63645982 | 1052 | old_loc = gfc_current_locus; |
6de9cd9a DN |
1053 | |
1054 | gfc_advance_line (); | |
0d3abf6f | 1055 | skip_fixed_comments (); |
6de9cd9a DN |
1056 | |
1057 | /* See if this line is a continuation line. */ | |
6c7a4dfd | 1058 | if (openmp_flag != prev_openmp_flag) |
6de9cd9a | 1059 | { |
6c7a4dfd JJ |
1060 | openmp_flag = prev_openmp_flag; |
1061 | goto not_continuation; | |
6de9cd9a DN |
1062 | } |
1063 | ||
6c7a4dfd JJ |
1064 | if (!openmp_flag) |
1065 | for (i = 0; i < 5; i++) | |
1066 | { | |
1067 | c = next_char (); | |
1068 | if (c != ' ') | |
1069 | goto not_continuation; | |
1070 | } | |
1071 | else | |
1072 | for (i = 0; i < 5; i++) | |
1073 | { | |
1074 | c = next_char (); | |
8fc541d3 | 1075 | if (gfc_wide_tolower (c) != (unsigned char) "*$omp"[i]) |
6c7a4dfd JJ |
1076 | goto not_continuation; |
1077 | } | |
1078 | ||
6de9cd9a | 1079 | c = next_char (); |
6c7a4dfd | 1080 | if (c == '0' || c == ' ' || c == '\n') |
6de9cd9a | 1081 | goto not_continuation; |
5a06474c JD |
1082 | |
1083 | /* We've got a continuation line. If we are on the very next line after | |
1084 | the last continuation, increment the continuation line count and | |
1085 | check whether the limit has been exceeded. */ | |
5ffeb913 | 1086 | if (gfc_linebuf_linenum (gfc_current_locus.lb) == continue_line + 1) |
5a06474c JD |
1087 | { |
1088 | if (++continue_count == gfc_option.max_continue_fixed) | |
1089 | { | |
edf1eac2 SK |
1090 | if (gfc_notification_std (GFC_STD_GNU) || pedantic) |
1091 | gfc_warning ("Limit of %d continuations exceeded in " | |
1092 | "statement at %C", | |
1093 | gfc_option.max_continue_fixed); | |
5a06474c JD |
1094 | } |
1095 | } | |
1096 | ||
f449022d JD |
1097 | if (gfc_current_locus.lb != NULL |
1098 | && continue_line < gfc_linebuf_linenum (gfc_current_locus.lb)) | |
5ffeb913 | 1099 | continue_line = gfc_linebuf_linenum (gfc_current_locus.lb); |
6de9cd9a DN |
1100 | } |
1101 | ||
1102 | /* Ready to read first character of continuation line, which might | |
1103 | be another continuation line! */ | |
1104 | goto restart; | |
1105 | ||
1106 | not_continuation: | |
1107 | c = '\n'; | |
63645982 | 1108 | gfc_current_locus = old_loc; |
6de9cd9a DN |
1109 | |
1110 | done: | |
5a06474c JD |
1111 | if (c == '\n') |
1112 | continue_count = 0; | |
6de9cd9a DN |
1113 | continue_flag = 0; |
1114 | return c; | |
1115 | } | |
1116 | ||
1117 | ||
1118 | /* Get the next character of input, folded to lowercase. In fixed | |
1119 | form mode, we also ignore spaces. When matcher subroutines are | |
1120 | parsing character literals, they have to call | |
1121 | gfc_next_char_literal(). */ | |
1122 | ||
8fc541d3 | 1123 | gfc_char_t |
6de9cd9a DN |
1124 | gfc_next_char (void) |
1125 | { | |
8fc541d3 | 1126 | gfc_char_t c; |
6de9cd9a DN |
1127 | |
1128 | do | |
1129 | { | |
1130 | c = gfc_next_char_literal (0); | |
1131 | } | |
d4fa05b9 | 1132 | while (gfc_current_form == FORM_FIXED && gfc_is_whitespace (c)); |
6de9cd9a | 1133 | |
8fc541d3 | 1134 | return gfc_wide_tolower (c); |
6de9cd9a DN |
1135 | } |
1136 | ||
8fc541d3 FXC |
1137 | char |
1138 | gfc_next_ascii_char (void) | |
1139 | { | |
1140 | gfc_char_t c = gfc_next_char (); | |
6de9cd9a | 1141 | |
8fc541d3 FXC |
1142 | return (gfc_wide_fits_in_byte (c) ? (unsigned char) c |
1143 | : (unsigned char) UCHAR_MAX); | |
1144 | } | |
1145 | ||
1146 | ||
1147 | gfc_char_t | |
6de9cd9a DN |
1148 | gfc_peek_char (void) |
1149 | { | |
1150 | locus old_loc; | |
8fc541d3 | 1151 | gfc_char_t c; |
6de9cd9a | 1152 | |
63645982 | 1153 | old_loc = gfc_current_locus; |
6de9cd9a | 1154 | c = gfc_next_char (); |
63645982 | 1155 | gfc_current_locus = old_loc; |
6de9cd9a DN |
1156 | |
1157 | return c; | |
1158 | } | |
1159 | ||
1160 | ||
8fc541d3 FXC |
1161 | char |
1162 | gfc_peek_ascii_char (void) | |
1163 | { | |
1164 | gfc_char_t c = gfc_peek_char (); | |
1165 | ||
1166 | return (gfc_wide_fits_in_byte (c) ? (unsigned char) c | |
1167 | : (unsigned char) UCHAR_MAX); | |
1168 | } | |
1169 | ||
1170 | ||
6de9cd9a DN |
1171 | /* Recover from an error. We try to get past the current statement |
1172 | and get lined up for the next. The next statement follows a '\n' | |
1173 | or a ';'. We also assume that we are not within a character | |
1174 | constant, and deal with finding a '\'' or '"'. */ | |
1175 | ||
1176 | void | |
1177 | gfc_error_recovery (void) | |
1178 | { | |
8fc541d3 | 1179 | gfc_char_t c, delim; |
6de9cd9a DN |
1180 | |
1181 | if (gfc_at_eof ()) | |
1182 | return; | |
1183 | ||
1184 | for (;;) | |
1185 | { | |
1186 | c = gfc_next_char (); | |
1187 | if (c == '\n' || c == ';') | |
1188 | break; | |
1189 | ||
1190 | if (c != '\'' && c != '"') | |
1191 | { | |
1192 | if (gfc_at_eof ()) | |
1193 | break; | |
1194 | continue; | |
1195 | } | |
1196 | delim = c; | |
1197 | ||
1198 | for (;;) | |
1199 | { | |
1200 | c = next_char (); | |
1201 | ||
1202 | if (c == delim) | |
1203 | break; | |
1204 | if (c == '\n') | |
ba1defa5 | 1205 | return; |
6de9cd9a DN |
1206 | if (c == '\\') |
1207 | { | |
1208 | c = next_char (); | |
1209 | if (c == '\n') | |
ba1defa5 | 1210 | return; |
6de9cd9a DN |
1211 | } |
1212 | } | |
1213 | if (gfc_at_eof ()) | |
1214 | break; | |
1215 | } | |
6de9cd9a DN |
1216 | } |
1217 | ||
1218 | ||
1219 | /* Read ahead until the next character to be read is not whitespace. */ | |
1220 | ||
1221 | void | |
1222 | gfc_gobble_whitespace (void) | |
1223 | { | |
840bd9f7 | 1224 | static int linenum = 0; |
6de9cd9a | 1225 | locus old_loc; |
8fc541d3 | 1226 | gfc_char_t c; |
6de9cd9a DN |
1227 | |
1228 | do | |
1229 | { | |
63645982 | 1230 | old_loc = gfc_current_locus; |
6de9cd9a | 1231 | c = gfc_next_char_literal (0); |
840bd9f7 SK |
1232 | /* Issue a warning for nonconforming tabs. We keep track of the line |
1233 | number because the Fortran matchers will often back up and the same | |
1234 | line will be scanned multiple times. */ | |
45a82bd9 | 1235 | if (!gfc_option.warn_tabs && c == '\t') |
840bd9f7 | 1236 | { |
45a82bd9 | 1237 | int cur_linenum = LOCATION_LINE (gfc_current_locus.lb->location); |
45a82bd9 PB |
1238 | if (cur_linenum != linenum) |
1239 | { | |
1240 | linenum = cur_linenum; | |
1241 | gfc_warning_now ("Nonconforming tab character at %C"); | |
1242 | } | |
840bd9f7 | 1243 | } |
6de9cd9a DN |
1244 | } |
1245 | while (gfc_is_whitespace (c)); | |
1246 | ||
63645982 | 1247 | gfc_current_locus = old_loc; |
6de9cd9a DN |
1248 | } |
1249 | ||
1250 | ||
f56c5d5d TS |
1251 | /* Load a single line into pbuf. |
1252 | ||
1253 | If pbuf points to a NULL pointer, it is allocated. | |
1254 | We truncate lines that are too long, unless we're dealing with | |
1255 | preprocessor lines or if the option -ffixed-line-length-none is set, | |
1256 | in which case we reallocate the buffer to fit the entire line, if | |
1257 | need be. | |
1258 | In fixed mode, we expand a tab that occurs within the statement | |
1259 | label region to expand to spaces that leave the next character in | |
ba1defa5 | 1260 | the source region. |
1526c4b5 JD |
1261 | load_line returns whether the line was truncated. |
1262 | ||
1263 | NOTE: The error machinery isn't available at this point, so we can't | |
1264 | easily report line and column numbers consistent with other | |
1265 | parts of gfortran. */ | |
6de9cd9a | 1266 | |
ba1defa5 | 1267 | static int |
8fc541d3 | 1268 | load_line (FILE *input, gfc_char_t **pbuf, int *pbuflen) |
6de9cd9a | 1269 | { |
840bd9f7 | 1270 | static int linenum = 0, current_line = 1; |
d1e3d6ae | 1271 | int c, maxlen, i, preprocessor_flag, buflen = *pbuflen; |
840bd9f7 | 1272 | int trunc_flag = 0, seen_comment = 0; |
1526c4b5 | 1273 | int seen_printable = 0, seen_ampersand = 0; |
8fc541d3 | 1274 | gfc_char_t *buffer; |
fd1935d5 | 1275 | bool found_tab = false; |
f56c5d5d | 1276 | |
1dde8683 | 1277 | /* Determine the maximum allowed line length. */ |
f56c5d5d | 1278 | if (gfc_current_form == FORM_FREE) |
1dde8683 | 1279 | maxlen = gfc_option.free_line_length; |
16ab8e74 | 1280 | else if (gfc_current_form == FORM_FIXED) |
1dde8683 | 1281 | maxlen = gfc_option.fixed_line_length; |
f56c5d5d | 1282 | else |
16ab8e74 | 1283 | maxlen = 72; |
f56c5d5d TS |
1284 | |
1285 | if (*pbuf == NULL) | |
1286 | { | |
1dde8683 BM |
1287 | /* Allocate the line buffer, storing its length into buflen. |
1288 | Note that if maxlen==0, indicating that arbitrary-length lines | |
1289 | are allowed, the buffer will be reallocated if this length is | |
1290 | insufficient; since 132 characters is the length of a standard | |
1291 | free-form line, we use that as a starting guess. */ | |
f56c5d5d TS |
1292 | if (maxlen > 0) |
1293 | buflen = maxlen; | |
1294 | else | |
1dde8683 | 1295 | buflen = 132; |
6de9cd9a | 1296 | |
8fc541d3 | 1297 | *pbuf = gfc_getmem ((buflen + 1) * sizeof (gfc_char_t)); |
f56c5d5d | 1298 | } |
6de9cd9a DN |
1299 | |
1300 | i = 0; | |
f56c5d5d | 1301 | buffer = *pbuf; |
6de9cd9a | 1302 | |
fa841200 | 1303 | preprocessor_flag = 0; |
c4da1827 | 1304 | c = getc (input); |
fa841200 | 1305 | if (c == '#') |
f56c5d5d TS |
1306 | /* In order to not truncate preprocessor lines, we have to |
1307 | remember that this is one. */ | |
fa841200 TS |
1308 | preprocessor_flag = 1; |
1309 | ungetc (c, input); | |
1310 | ||
6de9cd9a DN |
1311 | for (;;) |
1312 | { | |
c4da1827 | 1313 | c = getc (input); |
6de9cd9a DN |
1314 | |
1315 | if (c == EOF) | |
1316 | break; | |
1317 | if (c == '\n') | |
1526c4b5 JD |
1318 | { |
1319 | /* Check for illegal use of ampersand. See F95 Standard 3.3.1.3. */ | |
1320 | if (gfc_current_form == FORM_FREE | |
c284e499 | 1321 | && !seen_printable && seen_ampersand) |
1526c4b5 JD |
1322 | { |
1323 | if (pedantic) | |
edf1eac2 SK |
1324 | gfc_error_now ("'&' not allowed by itself in line %d", |
1325 | current_line); | |
1526c4b5 | 1326 | else |
edf1eac2 SK |
1327 | gfc_warning_now ("'&' not allowed by itself in line %d", |
1328 | current_line); | |
1526c4b5 JD |
1329 | } |
1330 | break; | |
1331 | } | |
6de9cd9a DN |
1332 | |
1333 | if (c == '\r') | |
d4fa05b9 | 1334 | continue; /* Gobble characters. */ |
6de9cd9a DN |
1335 | if (c == '\0') |
1336 | continue; | |
1337 | ||
1526c4b5 | 1338 | if (c == '&') |
1526c4b5 | 1339 | { |
c284e499 JD |
1340 | if (seen_ampersand) |
1341 | seen_ampersand = 0; | |
1526c4b5 | 1342 | else |
c284e499 | 1343 | seen_ampersand = 1; |
1526c4b5 JD |
1344 | } |
1345 | ||
bd5db9de | 1346 | if ((c != '&' && c != '!' && c != ' ') || (c == '!' && !seen_ampersand)) |
c284e499 JD |
1347 | seen_printable = 1; |
1348 | ||
840bd9f7 SK |
1349 | /* Is this a fixed-form comment? */ |
1350 | if (gfc_current_form == FORM_FIXED && i == 0 | |
1351 | && (c == '*' || c == 'c' || c == 'd')) | |
1352 | seen_comment = 1; | |
1353 | ||
fd1935d5 TB |
1354 | /* Vendor extension: "<tab>1" marks a continuation line. */ |
1355 | if (found_tab) | |
840bd9f7 | 1356 | { |
fd1935d5 TB |
1357 | found_tab = false; |
1358 | if (c >= '1' && c <= '9') | |
1359 | { | |
1360 | *(buffer-1) = c; | |
1361 | continue; | |
1362 | } | |
1363 | } | |
1364 | ||
1365 | if (gfc_current_form == FORM_FIXED && c == '\t' && i < 6) | |
1366 | { | |
1367 | found_tab = true; | |
1368 | ||
840bd9f7 SK |
1369 | if (!gfc_option.warn_tabs && seen_comment == 0 |
1370 | && current_line != linenum) | |
1371 | { | |
1372 | linenum = current_line; | |
fd1935d5 TB |
1373 | gfc_warning_now ("Nonconforming tab character in column %d " |
1374 | "of line %d", i+1, linenum); | |
840bd9f7 SK |
1375 | } |
1376 | ||
fd1935d5 | 1377 | while (i < 6) |
6de9cd9a DN |
1378 | { |
1379 | *buffer++ = ' '; | |
1380 | i++; | |
1381 | } | |
1382 | ||
1383 | continue; | |
1384 | } | |
1385 | ||
1386 | *buffer++ = c; | |
1387 | i++; | |
1388 | ||
d1e3d6ae | 1389 | if (maxlen == 0 || preprocessor_flag) |
f56c5d5d | 1390 | { |
d1e3d6ae JJ |
1391 | if (i >= buflen) |
1392 | { | |
1393 | /* Reallocate line buffer to double size to hold the | |
3fbab549 | 1394 | overlong line. */ |
d1e3d6ae | 1395 | buflen = buflen * 2; |
8fc541d3 | 1396 | *pbuf = xrealloc (*pbuf, (buflen + 1) * sizeof (gfc_char_t)); |
edf1eac2 | 1397 | buffer = (*pbuf) + i; |
d1e3d6ae | 1398 | } |
f56c5d5d | 1399 | } |
d1e3d6ae | 1400 | else if (i >= maxlen) |
16ab8e74 | 1401 | { |
f56c5d5d | 1402 | /* Truncate the rest of the line. */ |
6de9cd9a DN |
1403 | for (;;) |
1404 | { | |
c4da1827 | 1405 | c = getc (input); |
6de9cd9a DN |
1406 | if (c == '\n' || c == EOF) |
1407 | break; | |
a34938be RG |
1408 | |
1409 | trunc_flag = 1; | |
6de9cd9a DN |
1410 | } |
1411 | ||
1412 | ungetc ('\n', input); | |
1413 | } | |
1414 | } | |
1415 | ||
f56c5d5d TS |
1416 | /* Pad lines to the selected line length in fixed form. */ |
1417 | if (gfc_current_form == FORM_FIXED | |
043c2d9e | 1418 | && gfc_option.fixed_line_length != 0 |
f56c5d5d TS |
1419 | && !preprocessor_flag |
1420 | && c != EOF) | |
043c2d9e BF |
1421 | { |
1422 | while (i++ < maxlen) | |
1423 | *buffer++ = ' '; | |
1424 | } | |
f56c5d5d | 1425 | |
6de9cd9a | 1426 | *buffer = '\0'; |
d1e3d6ae | 1427 | *pbuflen = buflen; |
840bd9f7 | 1428 | current_line++; |
ba1defa5 RG |
1429 | |
1430 | return trunc_flag; | |
6de9cd9a DN |
1431 | } |
1432 | ||
1433 | ||
d4fa05b9 TS |
1434 | /* Get a gfc_file structure, initialize it and add it to |
1435 | the file stack. */ | |
1436 | ||
1437 | static gfc_file * | |
e0bcf78c | 1438 | get_file (const char *name, enum lc_reason reason ATTRIBUTE_UNUSED) |
d4fa05b9 TS |
1439 | { |
1440 | gfc_file *f; | |
1441 | ||
1442 | f = gfc_getmem (sizeof (gfc_file)); | |
1443 | ||
1444 | f->filename = gfc_getmem (strlen (name) + 1); | |
1445 | strcpy (f->filename, name); | |
1446 | ||
1447 | f->next = file_head; | |
1448 | file_head = f; | |
1449 | ||
60332588 | 1450 | f->up = current_file; |
d4fa05b9 | 1451 | if (current_file != NULL) |
1b271c9b | 1452 | f->inclusion_line = current_file->line; |
d4fa05b9 | 1453 | |
5ffeb913 | 1454 | linemap_add (line_table, reason, false, f->filename, 1); |
c8cc8542 | 1455 | |
d4fa05b9 TS |
1456 | return f; |
1457 | } | |
1458 | ||
8fc541d3 | 1459 | |
d4fa05b9 TS |
1460 | /* Deal with a line from the C preprocessor. The |
1461 | initial octothorp has already been seen. */ | |
6de9cd9a DN |
1462 | |
1463 | static void | |
8fc541d3 | 1464 | preprocessor_line (gfc_char_t *c) |
6de9cd9a | 1465 | { |
d4fa05b9 TS |
1466 | bool flag[5]; |
1467 | int i, line; | |
8fc541d3 | 1468 | gfc_char_t *wide_filename; |
d4fa05b9 | 1469 | gfc_file *f; |
2d7c7df6 | 1470 | int escaped, unescape; |
8fc541d3 | 1471 | char *filename; |
6de9cd9a | 1472 | |
d4fa05b9 TS |
1473 | c++; |
1474 | while (*c == ' ' || *c == '\t') | |
1475 | c++; | |
6de9cd9a | 1476 | |
d4fa05b9 | 1477 | if (*c < '0' || *c > '9') |
fa841200 | 1478 | goto bad_cpp_line; |
6de9cd9a | 1479 | |
8fc541d3 | 1480 | line = wide_atoi (c); |
d4fa05b9 | 1481 | |
8fc541d3 | 1482 | c = wide_strchr (c, ' '); |
fa841200 | 1483 | if (c == NULL) |
4c3a6ca1 JJ |
1484 | { |
1485 | /* No file name given. Set new line number. */ | |
1486 | current_file->line = line; | |
1487 | return; | |
1488 | } | |
d7d528c8 ES |
1489 | |
1490 | /* Skip spaces. */ | |
1491 | while (*c == ' ' || *c == '\t') | |
1492 | c++; | |
1493 | ||
1494 | /* Skip quote. */ | |
1495 | if (*c != '"') | |
fa841200 | 1496 | goto bad_cpp_line; |
d7d528c8 ES |
1497 | ++c; |
1498 | ||
8fc541d3 | 1499 | wide_filename = c; |
d4fa05b9 | 1500 | |
d7d528c8 | 1501 | /* Make filename end at quote. */ |
2d7c7df6 | 1502 | unescape = 0; |
d7d528c8 | 1503 | escaped = false; |
edf1eac2 | 1504 | while (*c && ! (!escaped && *c == '"')) |
d7d528c8 ES |
1505 | { |
1506 | if (escaped) | |
edf1eac2 | 1507 | escaped = false; |
2d7c7df6 JJ |
1508 | else if (*c == '\\') |
1509 | { | |
1510 | escaped = true; | |
1511 | unescape++; | |
1512 | } | |
d7d528c8 ES |
1513 | ++c; |
1514 | } | |
1515 | ||
1516 | if (! *c) | |
fa841200 TS |
1517 | /* Preprocessor line has no closing quote. */ |
1518 | goto bad_cpp_line; | |
d7d528c8 | 1519 | |
d4fa05b9 TS |
1520 | *c++ = '\0'; |
1521 | ||
2d7c7df6 JJ |
1522 | /* Undo effects of cpp_quote_string. */ |
1523 | if (unescape) | |
1524 | { | |
8fc541d3 FXC |
1525 | gfc_char_t *s = wide_filename; |
1526 | gfc_char_t *d = gfc_getmem (c - wide_filename - unescape); | |
d7d528c8 | 1527 | |
8fc541d3 | 1528 | wide_filename = d; |
2d7c7df6 JJ |
1529 | while (*s) |
1530 | { | |
1531 | if (*s == '\\') | |
1532 | *d++ = *++s; | |
1533 | else | |
1534 | *d++ = *s; | |
1535 | s++; | |
1536 | } | |
1537 | *d = '\0'; | |
1538 | } | |
d7d528c8 | 1539 | |
d4fa05b9 | 1540 | /* Get flags. */ |
4c3a6ca1 | 1541 | |
1e39a151 | 1542 | flag[1] = flag[2] = flag[3] = flag[4] = false; |
6de9cd9a | 1543 | |
6de9cd9a DN |
1544 | for (;;) |
1545 | { | |
8fc541d3 | 1546 | c = wide_strchr (c, ' '); |
d4fa05b9 TS |
1547 | if (c == NULL) |
1548 | break; | |
6de9cd9a | 1549 | |
d4fa05b9 | 1550 | c++; |
8fc541d3 | 1551 | i = wide_atoi (c); |
6de9cd9a | 1552 | |
d4fa05b9 TS |
1553 | if (1 <= i && i <= 4) |
1554 | flag[i] = true; | |
1555 | } | |
4c3a6ca1 | 1556 | |
8fc541d3 FXC |
1557 | /* Convert the filename in wide characters into a filename in narrow |
1558 | characters. */ | |
1559 | filename = widechar_to_char (wide_filename); | |
1560 | ||
d4fa05b9 | 1561 | /* Interpret flags. */ |
4c3a6ca1 | 1562 | |
94b00ee4 | 1563 | if (flag[1]) /* Starting new file. */ |
d4fa05b9 | 1564 | { |
c8cc8542 | 1565 | f = get_file (filename, LC_RENAME); |
1b271c9b | 1566 | add_file_change (f->filename, f->inclusion_line); |
d4fa05b9 TS |
1567 | current_file = f; |
1568 | } | |
4c3a6ca1 | 1569 | |
d4fa05b9 TS |
1570 | if (flag[2]) /* Ending current file. */ |
1571 | { | |
94b00ee4 JJ |
1572 | if (!current_file->up |
1573 | || strcmp (current_file->up->filename, filename) != 0) | |
4c3a6ca1 JJ |
1574 | { |
1575 | gfc_warning_now ("%s:%d: file %s left but not entered", | |
1576 | current_file->filename, current_file->line, | |
1577 | filename); | |
2d7c7df6 | 1578 | if (unescape) |
8fc541d3 FXC |
1579 | gfc_free (wide_filename); |
1580 | gfc_free (filename); | |
4c3a6ca1 JJ |
1581 | return; |
1582 | } | |
ee07457b | 1583 | |
1b271c9b | 1584 | add_file_change (NULL, line); |
94b00ee4 | 1585 | current_file = current_file->up; |
ee07457b FXC |
1586 | linemap_add (line_table, LC_RENAME, false, current_file->filename, |
1587 | current_file->line); | |
d4fa05b9 | 1588 | } |
4c3a6ca1 | 1589 | |
d4fa05b9 TS |
1590 | /* The name of the file can be a temporary file produced by |
1591 | cpp. Replace the name if it is different. */ | |
4c3a6ca1 | 1592 | |
d4fa05b9 TS |
1593 | if (strcmp (current_file->filename, filename) != 0) |
1594 | { | |
1595 | gfc_free (current_file->filename); | |
1596 | current_file->filename = gfc_getmem (strlen (filename) + 1); | |
1597 | strcpy (current_file->filename, filename); | |
1598 | } | |
fa841200 | 1599 | |
4c3a6ca1 JJ |
1600 | /* Set new line number. */ |
1601 | current_file->line = line; | |
2d7c7df6 | 1602 | if (unescape) |
8fc541d3 FXC |
1603 | gfc_free (wide_filename); |
1604 | gfc_free (filename); | |
fa841200 TS |
1605 | return; |
1606 | ||
1607 | bad_cpp_line: | |
4c3a6ca1 | 1608 | gfc_warning_now ("%s:%d: Illegal preprocessor directive", |
fa841200 TS |
1609 | current_file->filename, current_file->line); |
1610 | current_file->line++; | |
d4fa05b9 TS |
1611 | } |
1612 | ||
1613 | ||
e0bcf78c | 1614 | static try load_file (const char *, bool); |
d4fa05b9 TS |
1615 | |
1616 | /* include_line()-- Checks a line buffer to see if it is an include | |
1617 | line. If so, we call load_file() recursively to load the included | |
1618 | file. We never return a syntax error because a statement like | |
1619 | "include = 5" is perfectly legal. We return false if no include was | |
1620 | processed or true if we matched an include. */ | |
1621 | ||
1622 | static bool | |
8fc541d3 | 1623 | include_line (gfc_char_t *line) |
d4fa05b9 | 1624 | { |
8fc541d3 FXC |
1625 | gfc_char_t quote, *c, *begin, *stop; |
1626 | char *filename; | |
9b9e4cd6 | 1627 | |
d4fa05b9 | 1628 | c = line; |
9b9e4cd6 JJ |
1629 | |
1630 | if (gfc_option.flag_openmp) | |
1631 | { | |
1632 | if (gfc_current_form == FORM_FREE) | |
1633 | { | |
1634 | while (*c == ' ' || *c == '\t') | |
1635 | c++; | |
1636 | if (*c == '!' && c[1] == '$' && (c[2] == ' ' || c[2] == '\t')) | |
1637 | c += 3; | |
1638 | } | |
1639 | else | |
1640 | { | |
1641 | if ((*c == '!' || *c == 'c' || *c == 'C' || *c == '*') | |
1642 | && c[1] == '$' && (c[2] == ' ' || c[2] == '\t')) | |
1643 | c += 3; | |
1644 | } | |
1645 | } | |
1646 | ||
d4fa05b9 TS |
1647 | while (*c == ' ' || *c == '\t') |
1648 | c++; | |
1649 | ||
8fc541d3 FXC |
1650 | if (wide_strncasecmp (c, "include", 7)) |
1651 | return false; | |
d4fa05b9 TS |
1652 | |
1653 | c += 7; | |
1654 | while (*c == ' ' || *c == '\t') | |
1655 | c++; | |
1656 | ||
1657 | /* Find filename between quotes. */ | |
1658 | ||
1659 | quote = *c++; | |
1660 | if (quote != '"' && quote != '\'') | |
1661 | return false; | |
1662 | ||
1663 | begin = c; | |
1664 | ||
1665 | while (*c != quote && *c != '\0') | |
1666 | c++; | |
1667 | ||
1668 | if (*c == '\0') | |
1669 | return false; | |
1670 | ||
1671 | stop = c++; | |
1672 | ||
1673 | while (*c == ' ' || *c == '\t') | |
1674 | c++; | |
1675 | ||
1676 | if (*c != '\0' && *c != '!') | |
1677 | return false; | |
1678 | ||
f7b529fa | 1679 | /* We have an include line at this point. */ |
d4fa05b9 TS |
1680 | |
1681 | *stop = '\0'; /* It's ok to trash the buffer, as this line won't be | |
1682 | read by anything else. */ | |
1683 | ||
8fc541d3 FXC |
1684 | filename = widechar_to_char (begin); |
1685 | load_file (filename, false); | |
1686 | gfc_free (filename); | |
d4fa05b9 TS |
1687 | return true; |
1688 | } | |
1689 | ||
edf1eac2 | 1690 | |
d4fa05b9 TS |
1691 | /* Load a file into memory by calling load_line until the file ends. */ |
1692 | ||
1693 | static try | |
e0bcf78c | 1694 | load_file (const char *filename, bool initial) |
d4fa05b9 | 1695 | { |
8fc541d3 | 1696 | gfc_char_t *line; |
d4fa05b9 TS |
1697 | gfc_linebuf *b; |
1698 | gfc_file *f; | |
1699 | FILE *input; | |
d1e3d6ae | 1700 | int len, line_len; |
caef7872 | 1701 | bool first_line; |
d4fa05b9 TS |
1702 | |
1703 | for (f = current_file; f; f = f->up) | |
1704 | if (strcmp (filename, f->filename) == 0) | |
1705 | { | |
1706 | gfc_error_now ("File '%s' is being included recursively", filename); | |
1707 | return FAILURE; | |
1708 | } | |
1709 | ||
1710 | if (initial) | |
1711 | { | |
2d7c7df6 JJ |
1712 | if (gfc_src_file) |
1713 | { | |
1714 | input = gfc_src_file; | |
1715 | gfc_src_file = NULL; | |
1716 | } | |
1717 | else | |
1718 | input = gfc_open_file (filename); | |
d4fa05b9 TS |
1719 | if (input == NULL) |
1720 | { | |
1721 | gfc_error_now ("Can't open file '%s'", filename); | |
1722 | return FAILURE; | |
1723 | } | |
1724 | } | |
1725 | else | |
1726 | { | |
31198773 | 1727 | input = gfc_open_included_file (filename, false, false); |
d4fa05b9 TS |
1728 | if (input == NULL) |
1729 | { | |
1730 | gfc_error_now ("Can't open included file '%s'", filename); | |
1731 | return FAILURE; | |
1732 | } | |
1733 | } | |
1734 | ||
1735 | /* Load the file. */ | |
1736 | ||
c8cc8542 | 1737 | f = get_file (filename, initial ? LC_RENAME : LC_ENTER); |
1b271c9b JJ |
1738 | if (!initial) |
1739 | add_file_change (f->filename, f->inclusion_line); | |
d4fa05b9 TS |
1740 | current_file = f; |
1741 | current_file->line = 1; | |
f56c5d5d | 1742 | line = NULL; |
d1e3d6ae | 1743 | line_len = 0; |
caef7872 | 1744 | first_line = true; |
d4fa05b9 | 1745 | |
2d7c7df6 JJ |
1746 | if (initial && gfc_src_preprocessor_lines[0]) |
1747 | { | |
1748 | preprocessor_line (gfc_src_preprocessor_lines[0]); | |
1749 | gfc_free (gfc_src_preprocessor_lines[0]); | |
1750 | gfc_src_preprocessor_lines[0] = NULL; | |
1751 | if (gfc_src_preprocessor_lines[1]) | |
1752 | { | |
1753 | preprocessor_line (gfc_src_preprocessor_lines[1]); | |
1754 | gfc_free (gfc_src_preprocessor_lines[1]); | |
1755 | gfc_src_preprocessor_lines[1] = NULL; | |
1756 | } | |
1757 | } | |
1758 | ||
16ab8e74 | 1759 | for (;;) |
d4fa05b9 | 1760 | { |
d1e3d6ae | 1761 | int trunc = load_line (input, &line, &line_len); |
d4fa05b9 | 1762 | |
8fc541d3 | 1763 | len = gfc_wide_strlen (line); |
6de9cd9a DN |
1764 | if (feof (input) && len == 0) |
1765 | break; | |
1766 | ||
caef7872 FXC |
1767 | /* If this is the first line of the file, it can contain a byte |
1768 | order mark (BOM), which we will ignore: | |
1769 | FF FE is UTF-16 little endian, | |
1770 | FE FF is UTF-16 big endian, | |
1771 | EF BB BF is UTF-8. */ | |
1772 | if (first_line | |
8fc541d3 FXC |
1773 | && ((line_len >= 2 && line[0] == (unsigned char) '\xFF' |
1774 | && line[1] == (unsigned char) '\xFE') | |
1775 | || (line_len >= 2 && line[0] == (unsigned char) '\xFE' | |
1776 | && line[1] == (unsigned char) '\xFF') | |
1777 | || (line_len >= 3 && line[0] == (unsigned char) '\xEF' | |
1778 | && line[1] == (unsigned char) '\xBB' | |
1779 | && line[2] == (unsigned char) '\xBF'))) | |
caef7872 | 1780 | { |
8fc541d3 FXC |
1781 | int n = line[1] == (unsigned char) '\xBB' ? 3 : 2; |
1782 | gfc_char_t *new = gfc_getmem (line_len * sizeof (gfc_char_t)); | |
caef7872 | 1783 | |
8fc541d3 | 1784 | wide_strcpy (new, &line[n]); |
caef7872 FXC |
1785 | gfc_free (line); |
1786 | line = new; | |
1787 | len -= n; | |
1788 | } | |
1789 | ||
d4fa05b9 TS |
1790 | /* There are three things this line can be: a line of Fortran |
1791 | source, an include line or a C preprocessor directive. */ | |
6de9cd9a | 1792 | |
d4fa05b9 TS |
1793 | if (line[0] == '#') |
1794 | { | |
9e8a6720 FXC |
1795 | /* When -g3 is specified, it's possible that we emit #define |
1796 | and #undef lines, which we need to pass to the middle-end | |
1797 | so that it can emit correct debug info. */ | |
1798 | if (debug_info_level == DINFO_LEVEL_VERBOSE | |
8fc541d3 FXC |
1799 | && (wide_strncmp (line, "#define ", 8) == 0 |
1800 | || wide_strncmp (line, "#undef ", 7) == 0)) | |
9e8a6720 FXC |
1801 | ; |
1802 | else | |
1803 | { | |
1804 | preprocessor_line (line); | |
1805 | continue; | |
1806 | } | |
d4fa05b9 | 1807 | } |
6de9cd9a | 1808 | |
caef7872 FXC |
1809 | /* Preprocessed files have preprocessor lines added before the byte |
1810 | order mark, so first_line is not about the first line of the file | |
1811 | but the first line that's not a preprocessor line. */ | |
1812 | first_line = false; | |
1813 | ||
d4fa05b9 TS |
1814 | if (include_line (line)) |
1815 | { | |
1816 | current_file->line++; | |
1817 | continue; | |
6de9cd9a DN |
1818 | } |
1819 | ||
d4fa05b9 TS |
1820 | /* Add line. */ |
1821 | ||
8fc541d3 FXC |
1822 | b = gfc_getmem (gfc_linebuf_header_size |
1823 | + (len + 1) * sizeof (gfc_char_t)); | |
d4fa05b9 | 1824 | |
c8cc8542 | 1825 | b->location |
5ffeb913 | 1826 | = linemap_line_start (line_table, current_file->line++, 120); |
d4fa05b9 | 1827 | b->file = current_file; |
ba1defa5 | 1828 | b->truncated = trunc; |
8fc541d3 | 1829 | wide_strcpy (b->line, line); |
d4fa05b9 TS |
1830 | |
1831 | if (line_head == NULL) | |
1832 | line_head = b; | |
1833 | else | |
1834 | line_tail->next = b; | |
1835 | ||
1836 | line_tail = b; | |
1b271c9b JJ |
1837 | |
1838 | while (file_changes_cur < file_changes_count) | |
1839 | file_changes[file_changes_cur++].lb = b; | |
6de9cd9a | 1840 | } |
d4fa05b9 | 1841 | |
f56c5d5d TS |
1842 | /* Release the line buffer allocated in load_line. */ |
1843 | gfc_free (line); | |
1844 | ||
d4fa05b9 TS |
1845 | fclose (input); |
1846 | ||
1b271c9b JJ |
1847 | if (!initial) |
1848 | add_file_change (NULL, current_file->inclusion_line + 1); | |
d4fa05b9 | 1849 | current_file = current_file->up; |
5ffeb913 | 1850 | linemap_add (line_table, LC_LEAVE, 0, NULL, 0); |
d4fa05b9 | 1851 | return SUCCESS; |
6de9cd9a DN |
1852 | } |
1853 | ||
1854 | ||
d4fa05b9 TS |
1855 | /* Open a new file and start scanning from that file. Returns SUCCESS |
1856 | if everything went OK, FAILURE otherwise. If form == FORM_UKNOWN | |
1857 | it tries to determine the source form from the filename, defaulting | |
1858 | to free form. */ | |
6de9cd9a DN |
1859 | |
1860 | try | |
e0bcf78c | 1861 | gfc_new_file (void) |
6de9cd9a | 1862 | { |
d4fa05b9 | 1863 | try result; |
6de9cd9a | 1864 | |
d4fa05b9 | 1865 | result = load_file (gfc_source_file, true); |
6de9cd9a | 1866 | |
63645982 TS |
1867 | gfc_current_locus.lb = line_head; |
1868 | gfc_current_locus.nextc = (line_head == NULL) ? NULL : line_head->line; | |
6de9cd9a | 1869 | |
d4fa05b9 TS |
1870 | #if 0 /* Debugging aid. */ |
1871 | for (; line_head; line_head = line_head->next) | |
6c1abb5c FXC |
1872 | printf ("%s:%3d %s\n", LOCATION_FILE (line_head->location), |
1873 | LOCATION_LINE (line_head->location), line_head->line); | |
6de9cd9a | 1874 | |
d4fa05b9 TS |
1875 | exit (0); |
1876 | #endif | |
6de9cd9a | 1877 | |
d4fa05b9 | 1878 | return result; |
6de9cd9a | 1879 | } |
2d7c7df6 JJ |
1880 | |
1881 | static char * | |
1882 | unescape_filename (const char *ptr) | |
1883 | { | |
1884 | const char *p = ptr, *s; | |
1885 | char *d, *ret; | |
1886 | int escaped, unescape = 0; | |
1887 | ||
1888 | /* Make filename end at quote. */ | |
1889 | escaped = false; | |
1890 | while (*p && ! (! escaped && *p == '"')) | |
1891 | { | |
1892 | if (escaped) | |
1893 | escaped = false; | |
1894 | else if (*p == '\\') | |
1895 | { | |
1896 | escaped = true; | |
1897 | unescape++; | |
1898 | } | |
1899 | ++p; | |
1900 | } | |
1901 | ||
edf1eac2 | 1902 | if (!*p || p[1]) |
2d7c7df6 JJ |
1903 | return NULL; |
1904 | ||
1905 | /* Undo effects of cpp_quote_string. */ | |
1906 | s = ptr; | |
1907 | d = gfc_getmem (p + 1 - ptr - unescape); | |
1908 | ret = d; | |
1909 | ||
1910 | while (s != p) | |
1911 | { | |
1912 | if (*s == '\\') | |
1913 | *d++ = *++s; | |
1914 | else | |
1915 | *d++ = *s; | |
1916 | s++; | |
1917 | } | |
1918 | *d = '\0'; | |
1919 | return ret; | |
1920 | } | |
1921 | ||
1922 | /* For preprocessed files, if the first tokens are of the form # NUM. | |
1923 | handle the directives so we know the original file name. */ | |
1924 | ||
1925 | const char * | |
1926 | gfc_read_orig_filename (const char *filename, const char **canon_source_file) | |
1927 | { | |
1928 | int c, len; | |
8fc541d3 | 1929 | char *dirname, *tmp; |
2d7c7df6 JJ |
1930 | |
1931 | gfc_src_file = gfc_open_file (filename); | |
1932 | if (gfc_src_file == NULL) | |
1933 | return NULL; | |
1934 | ||
c4da1827 | 1935 | c = getc (gfc_src_file); |
2d7c7df6 JJ |
1936 | ungetc (c, gfc_src_file); |
1937 | ||
1938 | if (c != '#') | |
1939 | return NULL; | |
1940 | ||
1941 | len = 0; | |
1942 | load_line (gfc_src_file, &gfc_src_preprocessor_lines[0], &len); | |
1943 | ||
8fc541d3 | 1944 | if (wide_strncmp (gfc_src_preprocessor_lines[0], "# 1 \"", 5) != 0) |
2d7c7df6 JJ |
1945 | return NULL; |
1946 | ||
8fc541d3 FXC |
1947 | tmp = widechar_to_char (&gfc_src_preprocessor_lines[0][5]); |
1948 | filename = unescape_filename (tmp); | |
1949 | gfc_free (tmp); | |
2d7c7df6 JJ |
1950 | if (filename == NULL) |
1951 | return NULL; | |
1952 | ||
c4da1827 | 1953 | c = getc (gfc_src_file); |
2d7c7df6 JJ |
1954 | ungetc (c, gfc_src_file); |
1955 | ||
1956 | if (c != '#') | |
1957 | return filename; | |
1958 | ||
1959 | len = 0; | |
1960 | load_line (gfc_src_file, &gfc_src_preprocessor_lines[1], &len); | |
1961 | ||
8fc541d3 | 1962 | if (wide_strncmp (gfc_src_preprocessor_lines[1], "# 1 \"", 5) != 0) |
2d7c7df6 JJ |
1963 | return filename; |
1964 | ||
8fc541d3 FXC |
1965 | tmp = widechar_to_char (&gfc_src_preprocessor_lines[1][5]); |
1966 | dirname = unescape_filename (tmp); | |
1967 | gfc_free (tmp); | |
2d7c7df6 JJ |
1968 | if (dirname == NULL) |
1969 | return filename; | |
1970 | ||
1971 | len = strlen (dirname); | |
1972 | if (len < 3 || dirname[len - 1] != '/' || dirname[len - 2] != '/') | |
1973 | { | |
1974 | gfc_free (dirname); | |
1975 | return filename; | |
1976 | } | |
1977 | dirname[len - 2] = '\0'; | |
1978 | set_src_pwd (dirname); | |
1979 | ||
1980 | if (! IS_ABSOLUTE_PATH (filename)) | |
1981 | { | |
1982 | char *p = gfc_getmem (len + strlen (filename)); | |
1983 | ||
1984 | memcpy (p, dirname, len - 2); | |
1985 | p[len - 2] = '/'; | |
1986 | strcpy (p + len - 1, filename); | |
1987 | *canon_source_file = p; | |
1988 | } | |
1989 | ||
1990 | gfc_free (dirname); | |
1991 | return filename; | |
1992 | } |