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6de9cd9a | 1 | /* Character scanner. |
66647d44 | 2 | Copyright (C) 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009 |
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" | |
670637ee | 50 | #include "cpp.h" |
6de9cd9a DN |
51 | |
52 | /* Structure for holding module and include file search path. */ | |
53 | typedef struct gfc_directorylist | |
54 | { | |
55 | char *path; | |
31198773 | 56 | bool use_for_modules; |
6de9cd9a DN |
57 | struct gfc_directorylist *next; |
58 | } | |
59 | gfc_directorylist; | |
60 | ||
61 | /* List of include file search directories. */ | |
31198773 | 62 | static gfc_directorylist *include_dirs, *intrinsic_modules_dirs; |
6de9cd9a | 63 | |
d4fa05b9 | 64 | static gfc_file *file_head, *current_file; |
6de9cd9a | 65 | |
6c7a4dfd | 66 | static int continue_flag, end_flag, openmp_flag; |
5a06474c | 67 | static int continue_count, continue_line; |
6c7a4dfd | 68 | static locus openmp_locus; |
6de9cd9a | 69 | |
d4fa05b9 TS |
70 | gfc_source_form gfc_current_form; |
71 | static gfc_linebuf *line_head, *line_tail; | |
72 | ||
63645982 | 73 | locus gfc_current_locus; |
e0bcf78c | 74 | const char *gfc_source_file; |
2d7c7df6 | 75 | static FILE *gfc_src_file; |
8fc541d3 | 76 | static gfc_char_t *gfc_src_preprocessor_lines[2]; |
2d7c7df6 | 77 | |
5a06474c | 78 | extern int pedantic; |
6de9cd9a | 79 | |
1b271c9b JJ |
80 | static struct gfc_file_change |
81 | { | |
82 | const char *filename; | |
83 | gfc_linebuf *lb; | |
84 | int line; | |
85 | } *file_changes; | |
86 | size_t file_changes_cur, file_changes_count; | |
87 | size_t file_changes_allocated; | |
88 | ||
8fc541d3 FXC |
89 | |
90 | /* Functions dealing with our wide characters (gfc_char_t) and | |
91 | sequences of such characters. */ | |
92 | ||
93 | int | |
94 | gfc_wide_fits_in_byte (gfc_char_t c) | |
95 | { | |
96 | return (c <= UCHAR_MAX); | |
97 | } | |
98 | ||
99 | static inline int | |
100 | wide_is_ascii (gfc_char_t c) | |
101 | { | |
102 | return (gfc_wide_fits_in_byte (c) && ((unsigned char) c & ~0x7f) == 0); | |
103 | } | |
104 | ||
105 | int | |
106 | gfc_wide_is_printable (gfc_char_t c) | |
107 | { | |
108 | return (gfc_wide_fits_in_byte (c) && ISPRINT ((unsigned char) c)); | |
109 | } | |
110 | ||
111 | gfc_char_t | |
112 | gfc_wide_tolower (gfc_char_t c) | |
113 | { | |
114 | return (wide_is_ascii (c) ? (gfc_char_t) TOLOWER((unsigned char) c) : c); | |
115 | } | |
116 | ||
00660189 FXC |
117 | gfc_char_t |
118 | gfc_wide_toupper (gfc_char_t c) | |
119 | { | |
120 | return (wide_is_ascii (c) ? (gfc_char_t) TOUPPER((unsigned char) c) : c); | |
121 | } | |
122 | ||
8fc541d3 FXC |
123 | int |
124 | gfc_wide_is_digit (gfc_char_t c) | |
125 | { | |
126 | return (c >= '0' && c <= '9'); | |
127 | } | |
128 | ||
129 | static inline int | |
130 | wide_atoi (gfc_char_t *c) | |
131 | { | |
132 | #define MAX_DIGITS 20 | |
133 | char buf[MAX_DIGITS+1]; | |
134 | int i = 0; | |
135 | ||
136 | while (gfc_wide_is_digit(*c) && i < MAX_DIGITS) | |
137 | buf[i++] = *c++; | |
138 | buf[i] = '\0'; | |
139 | return atoi (buf); | |
140 | } | |
141 | ||
142 | size_t | |
143 | gfc_wide_strlen (const gfc_char_t *str) | |
144 | { | |
145 | size_t i; | |
146 | ||
147 | for (i = 0; str[i]; i++) | |
148 | ; | |
149 | ||
150 | return i; | |
151 | } | |
152 | ||
00660189 FXC |
153 | gfc_char_t * |
154 | gfc_wide_memset (gfc_char_t *b, gfc_char_t c, size_t len) | |
155 | { | |
156 | size_t i; | |
157 | ||
158 | for (i = 0; i < len; i++) | |
159 | b[i] = c; | |
160 | ||
161 | return b; | |
162 | } | |
163 | ||
8fc541d3 FXC |
164 | static gfc_char_t * |
165 | wide_strcpy (gfc_char_t *dest, const gfc_char_t *src) | |
166 | { | |
167 | gfc_char_t *d; | |
168 | ||
169 | for (d = dest; (*d = *src) != '\0'; ++src, ++d) | |
170 | ; | |
171 | ||
172 | return dest; | |
173 | } | |
174 | ||
175 | static gfc_char_t * | |
00660189 | 176 | wide_strchr (const gfc_char_t *s, gfc_char_t c) |
8fc541d3 FXC |
177 | { |
178 | do { | |
179 | if (*s == c) | |
180 | { | |
00660189 | 181 | return CONST_CAST(gfc_char_t *, s); |
8fc541d3 FXC |
182 | } |
183 | } while (*s++); | |
184 | return 0; | |
185 | } | |
186 | ||
00660189 FXC |
187 | char * |
188 | gfc_widechar_to_char (const gfc_char_t *s, int length) | |
189 | { | |
190 | size_t len, i; | |
191 | char *res; | |
192 | ||
193 | if (s == NULL) | |
194 | return NULL; | |
195 | ||
196 | /* Passing a negative length is used to indicate that length should be | |
197 | calculated using gfc_wide_strlen(). */ | |
198 | len = (length >= 0 ? (size_t) length : gfc_wide_strlen (s)); | |
ece3f663 | 199 | res = XNEWVEC (char, len + 1); |
00660189 FXC |
200 | |
201 | for (i = 0; i < len; i++) | |
202 | { | |
203 | gcc_assert (gfc_wide_fits_in_byte (s[i])); | |
204 | res[i] = (unsigned char) s[i]; | |
205 | } | |
206 | ||
207 | res[len] = '\0'; | |
208 | return res; | |
209 | } | |
210 | ||
211 | gfc_char_t * | |
212 | gfc_char_to_widechar (const char *s) | |
8fc541d3 | 213 | { |
00660189 FXC |
214 | size_t len, i; |
215 | gfc_char_t *res; | |
216 | ||
217 | if (s == NULL) | |
218 | return NULL; | |
219 | ||
220 | len = strlen (s); | |
221 | res = gfc_get_wide_string (len + 1); | |
8fc541d3 FXC |
222 | |
223 | for (i = 0; i < len; i++) | |
00660189 | 224 | res[i] = (unsigned char) s[i]; |
8fc541d3 FXC |
225 | |
226 | res[len] = '\0'; | |
227 | return res; | |
228 | } | |
229 | ||
230 | static int | |
231 | wide_strncmp (const gfc_char_t *s1, const char *s2, size_t n) | |
232 | { | |
233 | gfc_char_t c1, c2; | |
234 | ||
235 | while (n-- > 0) | |
236 | { | |
237 | c1 = *s1++; | |
238 | c2 = *s2++; | |
239 | if (c1 != c2) | |
240 | return (c1 > c2 ? 1 : -1); | |
241 | if (c1 == '\0') | |
242 | return 0; | |
243 | } | |
244 | return 0; | |
245 | } | |
246 | ||
00660189 FXC |
247 | int |
248 | gfc_wide_strncasecmp (const gfc_char_t *s1, const char *s2, size_t n) | |
8fc541d3 FXC |
249 | { |
250 | gfc_char_t c1, c2; | |
251 | ||
252 | while (n-- > 0) | |
253 | { | |
254 | c1 = gfc_wide_tolower (*s1++); | |
255 | c2 = TOLOWER (*s2++); | |
256 | if (c1 != c2) | |
257 | return (c1 > c2 ? 1 : -1); | |
258 | if (c1 == '\0') | |
259 | return 0; | |
260 | } | |
261 | return 0; | |
262 | } | |
263 | ||
264 | ||
6de9cd9a DN |
265 | /* Main scanner initialization. */ |
266 | ||
267 | void | |
268 | gfc_scanner_init_1 (void) | |
269 | { | |
d4fa05b9 TS |
270 | file_head = NULL; |
271 | line_head = NULL; | |
272 | line_tail = NULL; | |
6de9cd9a | 273 | |
5a06474c JD |
274 | continue_count = 0; |
275 | continue_line = 0; | |
276 | ||
6de9cd9a DN |
277 | end_flag = 0; |
278 | } | |
279 | ||
280 | ||
281 | /* Main scanner destructor. */ | |
282 | ||
283 | void | |
284 | gfc_scanner_done_1 (void) | |
285 | { | |
d4fa05b9 TS |
286 | gfc_linebuf *lb; |
287 | gfc_file *f; | |
6de9cd9a | 288 | |
d4fa05b9 | 289 | while(line_head != NULL) |
6de9cd9a | 290 | { |
d4fa05b9 TS |
291 | lb = line_head->next; |
292 | gfc_free(line_head); | |
293 | line_head = lb; | |
6de9cd9a | 294 | } |
d4fa05b9 TS |
295 | |
296 | while(file_head != NULL) | |
6de9cd9a | 297 | { |
d4fa05b9 TS |
298 | f = file_head->next; |
299 | gfc_free(file_head->filename); | |
300 | gfc_free(file_head); | |
301 | file_head = f; | |
6de9cd9a DN |
302 | } |
303 | } | |
304 | ||
305 | ||
306 | /* Adds path to the list pointed to by list. */ | |
307 | ||
31198773 FXC |
308 | static void |
309 | add_path_to_list (gfc_directorylist **list, const char *path, | |
0ee1b105 | 310 | bool use_for_modules, bool head) |
6de9cd9a DN |
311 | { |
312 | gfc_directorylist *dir; | |
313 | const char *p; | |
314 | ||
315 | p = path; | |
31198773 | 316 | while (*p == ' ' || *p == '\t') /* someone might do "-I include" */ |
6de9cd9a DN |
317 | if (*p++ == '\0') |
318 | return; | |
319 | ||
0ee1b105 TB |
320 | if (head || *list == NULL) |
321 | { | |
322 | dir = XCNEW (gfc_directorylist); | |
323 | if (!head) | |
324 | *list = dir; | |
325 | } | |
6de9cd9a DN |
326 | else |
327 | { | |
0ee1b105 | 328 | dir = *list; |
6de9cd9a DN |
329 | while (dir->next) |
330 | dir = dir->next; | |
331 | ||
ece3f663 | 332 | dir->next = XCNEW (gfc_directorylist); |
6de9cd9a DN |
333 | dir = dir->next; |
334 | } | |
335 | ||
0ee1b105 TB |
336 | dir->next = head ? *list : NULL; |
337 | if (head) | |
338 | *list = dir; | |
31198773 | 339 | dir->use_for_modules = use_for_modules; |
ece3f663 | 340 | dir->path = XCNEWVEC (char, strlen (p) + 2); |
6de9cd9a DN |
341 | strcpy (dir->path, p); |
342 | strcat (dir->path, "/"); /* make '/' last character */ | |
343 | } | |
344 | ||
345 | ||
31198773 | 346 | void |
0ee1b105 | 347 | gfc_add_include_path (const char *path, bool use_for_modules, bool file_dir) |
31198773 | 348 | { |
0ee1b105 TB |
349 | add_path_to_list (&include_dirs, path, use_for_modules, file_dir); |
350 | ||
351 | /* For '#include "..."' these directories are automatically searched. */ | |
352 | if (!file_dir) | |
353 | gfc_cpp_add_include_path (xstrdup(path), true); | |
31198773 FXC |
354 | } |
355 | ||
356 | ||
357 | void | |
358 | gfc_add_intrinsic_modules_path (const char *path) | |
359 | { | |
0ee1b105 | 360 | add_path_to_list (&intrinsic_modules_dirs, path, true, false); |
31198773 FXC |
361 | } |
362 | ||
363 | ||
6de9cd9a DN |
364 | /* Release resources allocated for options. */ |
365 | ||
366 | void | |
367 | gfc_release_include_path (void) | |
368 | { | |
369 | gfc_directorylist *p; | |
370 | ||
6de9cd9a DN |
371 | while (include_dirs != NULL) |
372 | { | |
373 | p = include_dirs; | |
374 | include_dirs = include_dirs->next; | |
375 | gfc_free (p->path); | |
376 | gfc_free (p); | |
377 | } | |
31198773 | 378 | |
31198773 FXC |
379 | while (intrinsic_modules_dirs != NULL) |
380 | { | |
381 | p = intrinsic_modules_dirs; | |
382 | intrinsic_modules_dirs = intrinsic_modules_dirs->next; | |
383 | gfc_free (p->path); | |
384 | gfc_free (p); | |
385 | } | |
1bc23383 FXC |
386 | |
387 | gfc_free (gfc_option.module_dir); | |
6de9cd9a DN |
388 | } |
389 | ||
6de9cd9a | 390 | |
31198773 FXC |
391 | static FILE * |
392 | open_included_file (const char *name, gfc_directorylist *list, bool module) | |
6de9cd9a | 393 | { |
200cfbe7 | 394 | char *fullname; |
6de9cd9a DN |
395 | gfc_directorylist *p; |
396 | FILE *f; | |
397 | ||
31198773 | 398 | for (p = list; p; p = p->next) |
b424a572 | 399 | { |
31198773 FXC |
400 | if (module && !p->use_for_modules) |
401 | continue; | |
6de9cd9a | 402 | |
200cfbe7 | 403 | fullname = (char *) alloca(strlen (p->path) + strlen (name) + 1); |
6de9cd9a DN |
404 | strcpy (fullname, p->path); |
405 | strcat (fullname, name); | |
406 | ||
407 | f = gfc_open_file (fullname); | |
408 | if (f != NULL) | |
409 | return f; | |
410 | } | |
411 | ||
412 | return NULL; | |
413 | } | |
414 | ||
31198773 FXC |
415 | |
416 | /* Opens file for reading, searching through the include directories | |
417 | given if necessary. If the include_cwd argument is true, we try | |
418 | to open the file in the current directory first. */ | |
419 | ||
420 | FILE * | |
421 | gfc_open_included_file (const char *name, bool include_cwd, bool module) | |
422 | { | |
423 | FILE *f; | |
424 | ||
e01f74e0 TB |
425 | if (IS_ABSOLUTE_PATH (name)) |
426 | return gfc_open_file (name); | |
427 | ||
31198773 FXC |
428 | if (include_cwd) |
429 | { | |
430 | f = gfc_open_file (name); | |
431 | if (f != NULL) | |
432 | return f; | |
433 | } | |
434 | ||
435 | return open_included_file (name, include_dirs, module); | |
436 | } | |
437 | ||
438 | FILE * | |
439 | gfc_open_intrinsic_module (const char *name) | |
440 | { | |
e01f74e0 TB |
441 | if (IS_ABSOLUTE_PATH (name)) |
442 | return gfc_open_file (name); | |
443 | ||
31198773 FXC |
444 | return open_included_file (name, intrinsic_modules_dirs, true); |
445 | } | |
446 | ||
edf1eac2 | 447 | |
6de9cd9a DN |
448 | /* Test to see if we're at the end of the main source file. */ |
449 | ||
450 | int | |
451 | gfc_at_end (void) | |
452 | { | |
6de9cd9a DN |
453 | return end_flag; |
454 | } | |
455 | ||
456 | ||
457 | /* Test to see if we're at the end of the current file. */ | |
458 | ||
459 | int | |
460 | gfc_at_eof (void) | |
461 | { | |
6de9cd9a DN |
462 | if (gfc_at_end ()) |
463 | return 1; | |
464 | ||
d4fa05b9 | 465 | if (line_head == NULL) |
6de9cd9a DN |
466 | return 1; /* Null file */ |
467 | ||
63645982 | 468 | if (gfc_current_locus.lb == NULL) |
6de9cd9a DN |
469 | return 1; |
470 | ||
471 | return 0; | |
472 | } | |
473 | ||
474 | ||
475 | /* Test to see if we're at the beginning of a new line. */ | |
476 | ||
477 | int | |
478 | gfc_at_bol (void) | |
479 | { | |
6de9cd9a DN |
480 | if (gfc_at_eof ()) |
481 | return 1; | |
482 | ||
63645982 | 483 | return (gfc_current_locus.nextc == gfc_current_locus.lb->line); |
6de9cd9a DN |
484 | } |
485 | ||
486 | ||
487 | /* Test to see if we're at the end of a line. */ | |
488 | ||
489 | int | |
490 | gfc_at_eol (void) | |
491 | { | |
6de9cd9a DN |
492 | if (gfc_at_eof ()) |
493 | return 1; | |
494 | ||
63645982 | 495 | return (*gfc_current_locus.nextc == '\0'); |
6de9cd9a DN |
496 | } |
497 | ||
60332588 | 498 | static void |
1b271c9b | 499 | add_file_change (const char *filename, int line) |
60332588 | 500 | { |
1b271c9b JJ |
501 | if (file_changes_count == file_changes_allocated) |
502 | { | |
503 | if (file_changes_allocated) | |
504 | file_changes_allocated *= 2; | |
505 | else | |
506 | file_changes_allocated = 16; | |
ece3f663 KG |
507 | file_changes = XRESIZEVEC (struct gfc_file_change, file_changes, |
508 | file_changes_allocated); | |
1b271c9b JJ |
509 | } |
510 | file_changes[file_changes_count].filename = filename; | |
511 | file_changes[file_changes_count].lb = NULL; | |
512 | file_changes[file_changes_count++].line = line; | |
513 | } | |
60332588 | 514 | |
1b271c9b JJ |
515 | static void |
516 | report_file_change (gfc_linebuf *lb) | |
517 | { | |
518 | size_t c = file_changes_cur; | |
519 | while (c < file_changes_count | |
520 | && file_changes[c].lb == lb) | |
521 | { | |
522 | if (file_changes[c].filename) | |
523 | (*debug_hooks->start_source_file) (file_changes[c].line, | |
524 | file_changes[c].filename); | |
525 | else | |
526 | (*debug_hooks->end_source_file) (file_changes[c].line); | |
527 | ++c; | |
528 | } | |
529 | file_changes_cur = c; | |
60332588 JJ |
530 | } |
531 | ||
532 | void | |
533 | gfc_start_source_files (void) | |
534 | { | |
535 | /* If the debugger wants the name of the main source file, | |
536 | we give it. */ | |
537 | if (debug_hooks->start_end_main_source_file) | |
538 | (*debug_hooks->start_source_file) (0, gfc_source_file); | |
539 | ||
1b271c9b JJ |
540 | file_changes_cur = 0; |
541 | report_file_change (gfc_current_locus.lb); | |
60332588 JJ |
542 | } |
543 | ||
544 | void | |
545 | gfc_end_source_files (void) | |
546 | { | |
1b271c9b | 547 | report_file_change (NULL); |
60332588 JJ |
548 | |
549 | if (debug_hooks->start_end_main_source_file) | |
550 | (*debug_hooks->end_source_file) (0); | |
551 | } | |
6de9cd9a DN |
552 | |
553 | /* Advance the current line pointer to the next line. */ | |
554 | ||
555 | void | |
556 | gfc_advance_line (void) | |
557 | { | |
6de9cd9a | 558 | if (gfc_at_end ()) |
4a58b9ad | 559 | return; |
6de9cd9a | 560 | |
63645982 | 561 | if (gfc_current_locus.lb == NULL) |
6de9cd9a | 562 | { |
d4fa05b9 TS |
563 | end_flag = 1; |
564 | return; | |
565 | } | |
6de9cd9a | 566 | |
9e8a6720 | 567 | if (gfc_current_locus.lb->next |
60332588 | 568 | && !gfc_current_locus.lb->next->dbg_emitted) |
9e8a6720 | 569 | { |
1b271c9b | 570 | report_file_change (gfc_current_locus.lb->next); |
60332588 | 571 | gfc_current_locus.lb->next->dbg_emitted = true; |
9e8a6720 FXC |
572 | } |
573 | ||
63645982 | 574 | gfc_current_locus.lb = gfc_current_locus.lb->next; |
6de9cd9a | 575 | |
edf1eac2 | 576 | if (gfc_current_locus.lb != NULL) |
63645982 | 577 | gfc_current_locus.nextc = gfc_current_locus.lb->line; |
d4fa05b9 TS |
578 | else |
579 | { | |
63645982 | 580 | gfc_current_locus.nextc = NULL; |
d4fa05b9 TS |
581 | end_flag = 1; |
582 | } | |
6de9cd9a DN |
583 | } |
584 | ||
585 | ||
586 | /* Get the next character from the input, advancing gfc_current_file's | |
587 | locus. When we hit the end of the line or the end of the file, we | |
588 | start returning a '\n' in order to complete the current statement. | |
589 | No Fortran line conventions are implemented here. | |
590 | ||
591 | Requiring explicit advances to the next line prevents the parse | |
592 | pointer from being on the wrong line if the current statement ends | |
593 | prematurely. */ | |
594 | ||
8fc541d3 | 595 | static gfc_char_t |
6de9cd9a DN |
596 | next_char (void) |
597 | { | |
8fc541d3 | 598 | gfc_char_t c; |
d4fa05b9 | 599 | |
63645982 | 600 | if (gfc_current_locus.nextc == NULL) |
6de9cd9a DN |
601 | return '\n'; |
602 | ||
8fc541d3 | 603 | c = *gfc_current_locus.nextc++; |
6de9cd9a DN |
604 | if (c == '\0') |
605 | { | |
63645982 | 606 | gfc_current_locus.nextc--; /* Remain on this line. */ |
6de9cd9a DN |
607 | c = '\n'; |
608 | } | |
609 | ||
610 | return c; | |
611 | } | |
612 | ||
edf1eac2 | 613 | |
6de9cd9a DN |
614 | /* Skip a comment. When we come here the parse pointer is positioned |
615 | immediately after the comment character. If we ever implement | |
616 | compiler directives withing comments, here is where we parse the | |
617 | directive. */ | |
618 | ||
619 | static void | |
620 | skip_comment_line (void) | |
621 | { | |
8fc541d3 | 622 | gfc_char_t c; |
6de9cd9a DN |
623 | |
624 | do | |
625 | { | |
626 | c = next_char (); | |
627 | } | |
628 | while (c != '\n'); | |
629 | ||
630 | gfc_advance_line (); | |
631 | } | |
632 | ||
633 | ||
9e8a6720 FXC |
634 | int |
635 | gfc_define_undef_line (void) | |
636 | { | |
8fc541d3 FXC |
637 | char *tmp; |
638 | ||
9e8a6720 | 639 | /* All lines beginning with '#' are either #define or #undef. */ |
8fc541d3 | 640 | if (debug_info_level != DINFO_LEVEL_VERBOSE || gfc_peek_ascii_char () != '#') |
9e8a6720 FXC |
641 | return 0; |
642 | ||
8fc541d3 FXC |
643 | if (wide_strncmp (gfc_current_locus.nextc, "#define ", 8) == 0) |
644 | { | |
00660189 | 645 | tmp = gfc_widechar_to_char (&gfc_current_locus.nextc[8], -1); |
8fc541d3 FXC |
646 | (*debug_hooks->define) (gfc_linebuf_linenum (gfc_current_locus.lb), |
647 | tmp); | |
648 | gfc_free (tmp); | |
649 | } | |
9e8a6720 | 650 | |
8fc541d3 FXC |
651 | if (wide_strncmp (gfc_current_locus.nextc, "#undef ", 7) == 0) |
652 | { | |
00660189 | 653 | tmp = gfc_widechar_to_char (&gfc_current_locus.nextc[7], -1); |
8fc541d3 FXC |
654 | (*debug_hooks->undef) (gfc_linebuf_linenum (gfc_current_locus.lb), |
655 | tmp); | |
656 | gfc_free (tmp); | |
657 | } | |
9e8a6720 FXC |
658 | |
659 | /* Skip the rest of the line. */ | |
660 | skip_comment_line (); | |
661 | ||
662 | return 1; | |
663 | } | |
664 | ||
665 | ||
6de9cd9a | 666 | /* Comment lines are null lines, lines containing only blanks or lines |
0d3abf6f JJ |
667 | on which the first nonblank line is a '!'. |
668 | Return true if !$ openmp conditional compilation sentinel was | |
669 | seen. */ | |
6de9cd9a | 670 | |
0d3abf6f | 671 | static bool |
6de9cd9a DN |
672 | skip_free_comments (void) |
673 | { | |
674 | locus start; | |
8fc541d3 | 675 | gfc_char_t c; |
6c7a4dfd | 676 | int at_bol; |
6de9cd9a DN |
677 | |
678 | for (;;) | |
679 | { | |
6c7a4dfd | 680 | at_bol = gfc_at_bol (); |
63645982 | 681 | start = gfc_current_locus; |
6de9cd9a DN |
682 | if (gfc_at_eof ()) |
683 | break; | |
684 | ||
685 | do | |
6c7a4dfd | 686 | c = next_char (); |
6de9cd9a DN |
687 | while (gfc_is_whitespace (c)); |
688 | ||
689 | if (c == '\n') | |
690 | { | |
691 | gfc_advance_line (); | |
692 | continue; | |
693 | } | |
694 | ||
695 | if (c == '!') | |
696 | { | |
6c7a4dfd JJ |
697 | /* If -fopenmp, we need to handle here 2 things: |
698 | 1) don't treat !$omp as comments, but directives | |
699 | 2) handle OpenMP conditional compilation, where | |
700 | !$ should be treated as 2 spaces (for initial lines | |
701 | only if followed by space). */ | |
702 | if (gfc_option.flag_openmp && at_bol) | |
703 | { | |
704 | locus old_loc = gfc_current_locus; | |
705 | if (next_char () == '$') | |
706 | { | |
707 | c = next_char (); | |
708 | if (c == 'o' || c == 'O') | |
709 | { | |
710 | if (((c = next_char ()) == 'm' || c == 'M') | |
9fa6cfec | 711 | && ((c = next_char ()) == 'p' || c == 'P')) |
6c7a4dfd | 712 | { |
a68ab351 JJ |
713 | if ((c = next_char ()) == ' ' || c == '\t' |
714 | || continue_flag) | |
6c7a4dfd | 715 | { |
9fa6cfec TB |
716 | while (gfc_is_whitespace (c)) |
717 | c = next_char (); | |
718 | if (c != '\n' && c != '!') | |
719 | { | |
720 | openmp_flag = 1; | |
721 | openmp_locus = old_loc; | |
722 | gfc_current_locus = start; | |
723 | return false; | |
724 | } | |
6c7a4dfd | 725 | } |
9fa6cfec TB |
726 | else |
727 | gfc_warning_now ("!$OMP at %C starts a commented " | |
728 | "line as it neither is followed " | |
729 | "by a space nor is a " | |
730 | "continuation line"); | |
6c7a4dfd JJ |
731 | } |
732 | gfc_current_locus = old_loc; | |
733 | next_char (); | |
734 | c = next_char (); | |
735 | } | |
a68ab351 | 736 | if (continue_flag || c == ' ' || c == '\t') |
6c7a4dfd JJ |
737 | { |
738 | gfc_current_locus = old_loc; | |
739 | next_char (); | |
b30c6a0d | 740 | openmp_flag = 0; |
0d3abf6f | 741 | return true; |
6c7a4dfd JJ |
742 | } |
743 | } | |
744 | gfc_current_locus = old_loc; | |
745 | } | |
6de9cd9a DN |
746 | skip_comment_line (); |
747 | continue; | |
748 | } | |
749 | ||
750 | break; | |
751 | } | |
752 | ||
6c7a4dfd JJ |
753 | if (openmp_flag && at_bol) |
754 | openmp_flag = 0; | |
63645982 | 755 | gfc_current_locus = start; |
0d3abf6f | 756 | return false; |
6de9cd9a DN |
757 | } |
758 | ||
759 | ||
760 | /* Skip comment lines in fixed source mode. We have the same rules as | |
761 | in skip_free_comment(), except that we can have a 'c', 'C' or '*' | |
e0bcf78c TS |
762 | in column 1, and a '!' cannot be in column 6. Also, we deal with |
763 | lines with 'd' or 'D' in column 1, if the user requested this. */ | |
6de9cd9a DN |
764 | |
765 | static void | |
766 | skip_fixed_comments (void) | |
767 | { | |
768 | locus start; | |
769 | int col; | |
8fc541d3 | 770 | gfc_char_t c; |
6de9cd9a | 771 | |
6c7a4dfd JJ |
772 | if (! gfc_at_bol ()) |
773 | { | |
774 | start = gfc_current_locus; | |
775 | if (! gfc_at_eof ()) | |
776 | { | |
777 | do | |
778 | c = next_char (); | |
779 | while (gfc_is_whitespace (c)); | |
780 | ||
781 | if (c == '\n') | |
782 | gfc_advance_line (); | |
783 | else if (c == '!') | |
784 | skip_comment_line (); | |
785 | } | |
786 | ||
787 | if (! gfc_at_bol ()) | |
788 | { | |
789 | gfc_current_locus = start; | |
790 | return; | |
791 | } | |
792 | } | |
793 | ||
6de9cd9a DN |
794 | for (;;) |
795 | { | |
63645982 | 796 | start = gfc_current_locus; |
6de9cd9a DN |
797 | if (gfc_at_eof ()) |
798 | break; | |
799 | ||
800 | c = next_char (); | |
801 | if (c == '\n') | |
802 | { | |
803 | gfc_advance_line (); | |
804 | continue; | |
805 | } | |
806 | ||
807 | if (c == '!' || c == 'c' || c == 'C' || c == '*') | |
808 | { | |
6c7a4dfd JJ |
809 | /* If -fopenmp, we need to handle here 2 things: |
810 | 1) don't treat !$omp|c$omp|*$omp as comments, but directives | |
811 | 2) handle OpenMP conditional compilation, where | |
812 | !$|c$|*$ should be treated as 2 spaces if the characters | |
813 | in columns 3 to 6 are valid fixed form label columns | |
814 | characters. */ | |
f449022d JD |
815 | if (gfc_current_locus.lb != NULL |
816 | && continue_line < gfc_linebuf_linenum (gfc_current_locus.lb)) | |
817 | continue_line = gfc_linebuf_linenum (gfc_current_locus.lb); | |
818 | ||
6c7a4dfd JJ |
819 | if (gfc_option.flag_openmp) |
820 | { | |
821 | if (next_char () == '$') | |
822 | { | |
823 | c = next_char (); | |
824 | if (c == 'o' || c == 'O') | |
825 | { | |
826 | if (((c = next_char ()) == 'm' || c == 'M') | |
827 | && ((c = next_char ()) == 'p' || c == 'P')) | |
828 | { | |
829 | c = next_char (); | |
830 | if (c != '\n' | |
831 | && ((openmp_flag && continue_flag) | |
a68ab351 | 832 | || c == ' ' || c == '\t' || c == '0')) |
6c7a4dfd | 833 | { |
a68ab351 | 834 | do |
6c7a4dfd | 835 | c = next_char (); |
a68ab351 | 836 | while (gfc_is_whitespace (c)); |
6c7a4dfd JJ |
837 | if (c != '\n' && c != '!') |
838 | { | |
839 | /* Canonicalize to *$omp. */ | |
840 | *start.nextc = '*'; | |
841 | openmp_flag = 1; | |
842 | gfc_current_locus = start; | |
843 | return; | |
844 | } | |
845 | } | |
846 | } | |
847 | } | |
848 | else | |
849 | { | |
850 | int digit_seen = 0; | |
851 | ||
852 | for (col = 3; col < 6; col++, c = next_char ()) | |
853 | if (c == ' ') | |
854 | continue; | |
a68ab351 JJ |
855 | else if (c == '\t') |
856 | { | |
857 | col = 6; | |
858 | break; | |
859 | } | |
6c7a4dfd JJ |
860 | else if (c < '0' || c > '9') |
861 | break; | |
862 | else | |
863 | digit_seen = 1; | |
864 | ||
865 | if (col == 6 && c != '\n' | |
866 | && ((continue_flag && !digit_seen) | |
a68ab351 | 867 | || c == ' ' || c == '\t' || c == '0')) |
6c7a4dfd JJ |
868 | { |
869 | gfc_current_locus = start; | |
870 | start.nextc[0] = ' '; | |
871 | start.nextc[1] = ' '; | |
872 | continue; | |
873 | } | |
874 | } | |
875 | } | |
876 | gfc_current_locus = start; | |
877 | } | |
6de9cd9a DN |
878 | skip_comment_line (); |
879 | continue; | |
880 | } | |
881 | ||
e0bcf78c TS |
882 | if (gfc_option.flag_d_lines != -1 && (c == 'd' || c == 'D')) |
883 | { | |
884 | if (gfc_option.flag_d_lines == 0) | |
885 | { | |
886 | skip_comment_line (); | |
887 | continue; | |
888 | } | |
889 | else | |
890 | *start.nextc = c = ' '; | |
891 | } | |
892 | ||
6de9cd9a | 893 | col = 1; |
e0bcf78c TS |
894 | |
895 | while (gfc_is_whitespace (c)) | |
6de9cd9a DN |
896 | { |
897 | c = next_char (); | |
898 | col++; | |
899 | } | |
6de9cd9a DN |
900 | |
901 | if (c == '\n') | |
902 | { | |
903 | gfc_advance_line (); | |
904 | continue; | |
905 | } | |
906 | ||
907 | if (col != 6 && c == '!') | |
908 | { | |
f449022d JD |
909 | if (gfc_current_locus.lb != NULL |
910 | && continue_line < gfc_linebuf_linenum (gfc_current_locus.lb)) | |
911 | continue_line = gfc_linebuf_linenum (gfc_current_locus.lb); | |
6de9cd9a DN |
912 | skip_comment_line (); |
913 | continue; | |
914 | } | |
915 | ||
916 | break; | |
917 | } | |
918 | ||
6c7a4dfd | 919 | openmp_flag = 0; |
63645982 | 920 | gfc_current_locus = start; |
6de9cd9a DN |
921 | } |
922 | ||
923 | ||
6c7a4dfd | 924 | /* Skips the current line if it is a comment. */ |
6de9cd9a DN |
925 | |
926 | void | |
927 | gfc_skip_comments (void) | |
928 | { | |
6c7a4dfd | 929 | if (gfc_current_form == FORM_FREE) |
6de9cd9a DN |
930 | skip_free_comments (); |
931 | else | |
932 | skip_fixed_comments (); | |
933 | } | |
934 | ||
935 | ||
936 | /* Get the next character from the input, taking continuation lines | |
937 | and end-of-line comments into account. This implies that comment | |
938 | lines between continued lines must be eaten here. For higher-level | |
939 | subroutines, this flattens continued lines into a single logical | |
940 | line. The in_string flag denotes whether we're inside a character | |
941 | context or not. */ | |
942 | ||
8fc541d3 | 943 | gfc_char_t |
6de9cd9a DN |
944 | gfc_next_char_literal (int in_string) |
945 | { | |
946 | locus old_loc; | |
8fc541d3 FXC |
947 | int i, prev_openmp_flag; |
948 | gfc_char_t c; | |
6de9cd9a DN |
949 | |
950 | continue_flag = 0; | |
951 | ||
952 | restart: | |
953 | c = next_char (); | |
954 | if (gfc_at_end ()) | |
5a06474c JD |
955 | { |
956 | continue_count = 0; | |
957 | return c; | |
958 | } | |
6de9cd9a | 959 | |
d4fa05b9 | 960 | if (gfc_current_form == FORM_FREE) |
6de9cd9a | 961 | { |
0d3abf6f JJ |
962 | bool openmp_cond_flag; |
963 | ||
6de9cd9a DN |
964 | if (!in_string && c == '!') |
965 | { | |
6c7a4dfd JJ |
966 | if (openmp_flag |
967 | && memcmp (&gfc_current_locus, &openmp_locus, | |
968 | sizeof (gfc_current_locus)) == 0) | |
969 | goto done; | |
970 | ||
6de9cd9a DN |
971 | /* This line can't be continued */ |
972 | do | |
973 | { | |
974 | c = next_char (); | |
975 | } | |
976 | while (c != '\n'); | |
977 | ||
a34938be RG |
978 | /* Avoid truncation warnings for comment ending lines. */ |
979 | gfc_current_locus.lb->truncated = 0; | |
980 | ||
6de9cd9a DN |
981 | goto done; |
982 | } | |
983 | ||
984 | if (c != '&') | |
985 | goto done; | |
986 | ||
987 | /* If the next nonblank character is a ! or \n, we've got a | |
6c7a4dfd | 988 | continuation line. */ |
63645982 | 989 | old_loc = gfc_current_locus; |
6de9cd9a DN |
990 | |
991 | c = next_char (); | |
992 | while (gfc_is_whitespace (c)) | |
993 | c = next_char (); | |
994 | ||
995 | /* Character constants to be continued cannot have commentary | |
6c7a4dfd | 996 | after the '&'. */ |
6de9cd9a DN |
997 | |
998 | if (in_string && c != '\n') | |
999 | { | |
63645982 | 1000 | gfc_current_locus = old_loc; |
6de9cd9a DN |
1001 | c = '&'; |
1002 | goto done; | |
1003 | } | |
1004 | ||
1005 | if (c != '!' && c != '\n') | |
1006 | { | |
63645982 | 1007 | gfc_current_locus = old_loc; |
6de9cd9a DN |
1008 | c = '&'; |
1009 | goto done; | |
1010 | } | |
1011 | ||
6c7a4dfd | 1012 | prev_openmp_flag = openmp_flag; |
6de9cd9a DN |
1013 | continue_flag = 1; |
1014 | if (c == '!') | |
1015 | skip_comment_line (); | |
1016 | else | |
1017 | gfc_advance_line (); | |
0267ffdc JD |
1018 | |
1019 | if (gfc_at_eof()) | |
1020 | goto not_continuation; | |
6de9cd9a | 1021 | |
5a06474c JD |
1022 | /* We've got a continuation line. If we are on the very next line after |
1023 | the last continuation, increment the continuation line count and | |
1024 | check whether the limit has been exceeded. */ | |
5ffeb913 | 1025 | if (gfc_linebuf_linenum (gfc_current_locus.lb) == continue_line + 1) |
5a06474c JD |
1026 | { |
1027 | if (++continue_count == gfc_option.max_continue_free) | |
1028 | { | |
edf1eac2 SK |
1029 | if (gfc_notification_std (GFC_STD_GNU) || pedantic) |
1030 | gfc_warning ("Limit of %d continuations exceeded in " | |
1031 | "statement at %C", gfc_option.max_continue_free); | |
5a06474c JD |
1032 | } |
1033 | } | |
5a06474c JD |
1034 | |
1035 | /* Now find where it continues. First eat any comment lines. */ | |
0d3abf6f | 1036 | openmp_cond_flag = skip_free_comments (); |
6de9cd9a | 1037 | |
f449022d JD |
1038 | if (gfc_current_locus.lb != NULL |
1039 | && continue_line < gfc_linebuf_linenum (gfc_current_locus.lb)) | |
1040 | continue_line = gfc_linebuf_linenum (gfc_current_locus.lb); | |
1041 | ||
6c7a4dfd JJ |
1042 | if (prev_openmp_flag != openmp_flag) |
1043 | { | |
1044 | gfc_current_locus = old_loc; | |
1045 | openmp_flag = prev_openmp_flag; | |
1046 | c = '&'; | |
1047 | goto done; | |
1048 | } | |
1049 | ||
6de9cd9a | 1050 | /* Now that we have a non-comment line, probe ahead for the |
6c7a4dfd JJ |
1051 | first non-whitespace character. If it is another '&', then |
1052 | reading starts at the next character, otherwise we must back | |
1053 | up to where the whitespace started and resume from there. */ | |
6de9cd9a | 1054 | |
63645982 | 1055 | old_loc = gfc_current_locus; |
6de9cd9a DN |
1056 | |
1057 | c = next_char (); | |
1058 | while (gfc_is_whitespace (c)) | |
1059 | c = next_char (); | |
1060 | ||
6c7a4dfd JJ |
1061 | if (openmp_flag) |
1062 | { | |
1063 | for (i = 0; i < 5; i++, c = next_char ()) | |
1064 | { | |
8fc541d3 | 1065 | gcc_assert (gfc_wide_tolower (c) == (unsigned char) "!$omp"[i]); |
6c7a4dfd JJ |
1066 | if (i == 4) |
1067 | old_loc = gfc_current_locus; | |
1068 | } | |
1069 | while (gfc_is_whitespace (c)) | |
1070 | c = next_char (); | |
1071 | } | |
1072 | ||
6de9cd9a | 1073 | if (c != '&') |
3fbab549 | 1074 | { |
5a06474c JD |
1075 | if (in_string) |
1076 | { | |
1077 | if (gfc_option.warn_ampersand) | |
edf1eac2 SK |
1078 | gfc_warning_now ("Missing '&' in continued character " |
1079 | "constant at %C"); | |
5a06474c JD |
1080 | gfc_current_locus.nextc--; |
1081 | } | |
0d3abf6f JJ |
1082 | /* Both !$omp and !$ -fopenmp continuation lines have & on the |
1083 | continuation line only optionally. */ | |
1084 | else if (openmp_flag || openmp_cond_flag) | |
1085 | gfc_current_locus.nextc--; | |
5a06474c JD |
1086 | else |
1087 | { | |
1088 | c = ' '; | |
1089 | gfc_current_locus = old_loc; | |
1090 | goto done; | |
1091 | } | |
3fbab549 | 1092 | } |
6de9cd9a DN |
1093 | } |
1094 | else | |
1095 | { | |
1096 | /* Fixed form continuation. */ | |
1097 | if (!in_string && c == '!') | |
1098 | { | |
1099 | /* Skip comment at end of line. */ | |
1100 | do | |
1101 | { | |
1102 | c = next_char (); | |
1103 | } | |
1104 | while (c != '\n'); | |
a34938be RG |
1105 | |
1106 | /* Avoid truncation warnings for comment ending lines. */ | |
1107 | gfc_current_locus.lb->truncated = 0; | |
6de9cd9a DN |
1108 | } |
1109 | ||
1110 | if (c != '\n') | |
1111 | goto done; | |
1112 | ||
6c7a4dfd | 1113 | prev_openmp_flag = openmp_flag; |
6de9cd9a | 1114 | continue_flag = 1; |
63645982 | 1115 | old_loc = gfc_current_locus; |
6de9cd9a DN |
1116 | |
1117 | gfc_advance_line (); | |
0d3abf6f | 1118 | skip_fixed_comments (); |
6de9cd9a DN |
1119 | |
1120 | /* See if this line is a continuation line. */ | |
6c7a4dfd | 1121 | if (openmp_flag != prev_openmp_flag) |
6de9cd9a | 1122 | { |
6c7a4dfd JJ |
1123 | openmp_flag = prev_openmp_flag; |
1124 | goto not_continuation; | |
6de9cd9a DN |
1125 | } |
1126 | ||
6c7a4dfd JJ |
1127 | if (!openmp_flag) |
1128 | for (i = 0; i < 5; i++) | |
1129 | { | |
1130 | c = next_char (); | |
1131 | if (c != ' ') | |
1132 | goto not_continuation; | |
1133 | } | |
1134 | else | |
1135 | for (i = 0; i < 5; i++) | |
1136 | { | |
1137 | c = next_char (); | |
8fc541d3 | 1138 | if (gfc_wide_tolower (c) != (unsigned char) "*$omp"[i]) |
6c7a4dfd JJ |
1139 | goto not_continuation; |
1140 | } | |
1141 | ||
6de9cd9a | 1142 | c = next_char (); |
6c7a4dfd | 1143 | if (c == '0' || c == ' ' || c == '\n') |
6de9cd9a | 1144 | goto not_continuation; |
5a06474c JD |
1145 | |
1146 | /* We've got a continuation line. If we are on the very next line after | |
1147 | the last continuation, increment the continuation line count and | |
1148 | check whether the limit has been exceeded. */ | |
5ffeb913 | 1149 | if (gfc_linebuf_linenum (gfc_current_locus.lb) == continue_line + 1) |
5a06474c JD |
1150 | { |
1151 | if (++continue_count == gfc_option.max_continue_fixed) | |
1152 | { | |
edf1eac2 SK |
1153 | if (gfc_notification_std (GFC_STD_GNU) || pedantic) |
1154 | gfc_warning ("Limit of %d continuations exceeded in " | |
1155 | "statement at %C", | |
1156 | gfc_option.max_continue_fixed); | |
5a06474c JD |
1157 | } |
1158 | } | |
1159 | ||
f449022d JD |
1160 | if (gfc_current_locus.lb != NULL |
1161 | && continue_line < gfc_linebuf_linenum (gfc_current_locus.lb)) | |
5ffeb913 | 1162 | continue_line = gfc_linebuf_linenum (gfc_current_locus.lb); |
6de9cd9a DN |
1163 | } |
1164 | ||
1165 | /* Ready to read first character of continuation line, which might | |
1166 | be another continuation line! */ | |
1167 | goto restart; | |
1168 | ||
1169 | not_continuation: | |
1170 | c = '\n'; | |
63645982 | 1171 | gfc_current_locus = old_loc; |
6de9cd9a DN |
1172 | |
1173 | done: | |
5a06474c JD |
1174 | if (c == '\n') |
1175 | continue_count = 0; | |
6de9cd9a DN |
1176 | continue_flag = 0; |
1177 | return c; | |
1178 | } | |
1179 | ||
1180 | ||
1181 | /* Get the next character of input, folded to lowercase. In fixed | |
1182 | form mode, we also ignore spaces. When matcher subroutines are | |
1183 | parsing character literals, they have to call | |
1184 | gfc_next_char_literal(). */ | |
1185 | ||
8fc541d3 | 1186 | gfc_char_t |
6de9cd9a DN |
1187 | gfc_next_char (void) |
1188 | { | |
8fc541d3 | 1189 | gfc_char_t c; |
6de9cd9a DN |
1190 | |
1191 | do | |
1192 | { | |
1193 | c = gfc_next_char_literal (0); | |
1194 | } | |
d4fa05b9 | 1195 | while (gfc_current_form == FORM_FIXED && gfc_is_whitespace (c)); |
6de9cd9a | 1196 | |
8fc541d3 | 1197 | return gfc_wide_tolower (c); |
6de9cd9a DN |
1198 | } |
1199 | ||
8fc541d3 FXC |
1200 | char |
1201 | gfc_next_ascii_char (void) | |
1202 | { | |
1203 | gfc_char_t c = gfc_next_char (); | |
6de9cd9a | 1204 | |
8fc541d3 FXC |
1205 | return (gfc_wide_fits_in_byte (c) ? (unsigned char) c |
1206 | : (unsigned char) UCHAR_MAX); | |
1207 | } | |
1208 | ||
1209 | ||
1210 | gfc_char_t | |
6de9cd9a DN |
1211 | gfc_peek_char (void) |
1212 | { | |
1213 | locus old_loc; | |
8fc541d3 | 1214 | gfc_char_t c; |
6de9cd9a | 1215 | |
63645982 | 1216 | old_loc = gfc_current_locus; |
6de9cd9a | 1217 | c = gfc_next_char (); |
63645982 | 1218 | gfc_current_locus = old_loc; |
6de9cd9a DN |
1219 | |
1220 | return c; | |
1221 | } | |
1222 | ||
1223 | ||
8fc541d3 FXC |
1224 | char |
1225 | gfc_peek_ascii_char (void) | |
1226 | { | |
1227 | gfc_char_t c = gfc_peek_char (); | |
1228 | ||
1229 | return (gfc_wide_fits_in_byte (c) ? (unsigned char) c | |
1230 | : (unsigned char) UCHAR_MAX); | |
1231 | } | |
1232 | ||
1233 | ||
6de9cd9a DN |
1234 | /* Recover from an error. We try to get past the current statement |
1235 | and get lined up for the next. The next statement follows a '\n' | |
1236 | or a ';'. We also assume that we are not within a character | |
1237 | constant, and deal with finding a '\'' or '"'. */ | |
1238 | ||
1239 | void | |
1240 | gfc_error_recovery (void) | |
1241 | { | |
8fc541d3 | 1242 | gfc_char_t c, delim; |
6de9cd9a DN |
1243 | |
1244 | if (gfc_at_eof ()) | |
1245 | return; | |
1246 | ||
1247 | for (;;) | |
1248 | { | |
1249 | c = gfc_next_char (); | |
1250 | if (c == '\n' || c == ';') | |
1251 | break; | |
1252 | ||
1253 | if (c != '\'' && c != '"') | |
1254 | { | |
1255 | if (gfc_at_eof ()) | |
1256 | break; | |
1257 | continue; | |
1258 | } | |
1259 | delim = c; | |
1260 | ||
1261 | for (;;) | |
1262 | { | |
1263 | c = next_char (); | |
1264 | ||
1265 | if (c == delim) | |
1266 | break; | |
1267 | if (c == '\n') | |
ba1defa5 | 1268 | return; |
6de9cd9a DN |
1269 | if (c == '\\') |
1270 | { | |
1271 | c = next_char (); | |
1272 | if (c == '\n') | |
ba1defa5 | 1273 | return; |
6de9cd9a DN |
1274 | } |
1275 | } | |
1276 | if (gfc_at_eof ()) | |
1277 | break; | |
1278 | } | |
6de9cd9a DN |
1279 | } |
1280 | ||
1281 | ||
1282 | /* Read ahead until the next character to be read is not whitespace. */ | |
1283 | ||
1284 | void | |
1285 | gfc_gobble_whitespace (void) | |
1286 | { | |
840bd9f7 | 1287 | static int linenum = 0; |
6de9cd9a | 1288 | locus old_loc; |
8fc541d3 | 1289 | gfc_char_t c; |
6de9cd9a DN |
1290 | |
1291 | do | |
1292 | { | |
63645982 | 1293 | old_loc = gfc_current_locus; |
6de9cd9a | 1294 | c = gfc_next_char_literal (0); |
840bd9f7 SK |
1295 | /* Issue a warning for nonconforming tabs. We keep track of the line |
1296 | number because the Fortran matchers will often back up and the same | |
1297 | line will be scanned multiple times. */ | |
45a82bd9 | 1298 | if (!gfc_option.warn_tabs && c == '\t') |
840bd9f7 | 1299 | { |
45a82bd9 | 1300 | int cur_linenum = LOCATION_LINE (gfc_current_locus.lb->location); |
45a82bd9 PB |
1301 | if (cur_linenum != linenum) |
1302 | { | |
1303 | linenum = cur_linenum; | |
1304 | gfc_warning_now ("Nonconforming tab character at %C"); | |
1305 | } | |
840bd9f7 | 1306 | } |
6de9cd9a DN |
1307 | } |
1308 | while (gfc_is_whitespace (c)); | |
1309 | ||
63645982 | 1310 | gfc_current_locus = old_loc; |
6de9cd9a DN |
1311 | } |
1312 | ||
1313 | ||
f56c5d5d TS |
1314 | /* Load a single line into pbuf. |
1315 | ||
1316 | If pbuf points to a NULL pointer, it is allocated. | |
1317 | We truncate lines that are too long, unless we're dealing with | |
1318 | preprocessor lines or if the option -ffixed-line-length-none is set, | |
1319 | in which case we reallocate the buffer to fit the entire line, if | |
1320 | need be. | |
1321 | In fixed mode, we expand a tab that occurs within the statement | |
1322 | label region to expand to spaces that leave the next character in | |
ba1defa5 | 1323 | the source region. |
f2f5443c FXC |
1324 | |
1325 | If first_char is not NULL, it's a pointer to a single char value holding | |
1326 | the first character of the line, which has already been read by the | |
1327 | caller. This avoids the use of ungetc(). | |
1328 | ||
1526c4b5 JD |
1329 | load_line returns whether the line was truncated. |
1330 | ||
1331 | NOTE: The error machinery isn't available at this point, so we can't | |
1332 | easily report line and column numbers consistent with other | |
1333 | parts of gfortran. */ | |
6de9cd9a | 1334 | |
ba1defa5 | 1335 | static int |
f2f5443c | 1336 | load_line (FILE *input, gfc_char_t **pbuf, int *pbuflen, const int *first_char) |
6de9cd9a | 1337 | { |
840bd9f7 | 1338 | static int linenum = 0, current_line = 1; |
d1e3d6ae | 1339 | int c, maxlen, i, preprocessor_flag, buflen = *pbuflen; |
840bd9f7 | 1340 | int trunc_flag = 0, seen_comment = 0; |
1526c4b5 | 1341 | int seen_printable = 0, seen_ampersand = 0; |
8fc541d3 | 1342 | gfc_char_t *buffer; |
fd1935d5 | 1343 | bool found_tab = false; |
f56c5d5d | 1344 | |
1dde8683 | 1345 | /* Determine the maximum allowed line length. */ |
f56c5d5d | 1346 | if (gfc_current_form == FORM_FREE) |
1dde8683 | 1347 | maxlen = gfc_option.free_line_length; |
16ab8e74 | 1348 | else if (gfc_current_form == FORM_FIXED) |
1dde8683 | 1349 | maxlen = gfc_option.fixed_line_length; |
f56c5d5d | 1350 | else |
16ab8e74 | 1351 | maxlen = 72; |
f56c5d5d TS |
1352 | |
1353 | if (*pbuf == NULL) | |
1354 | { | |
1dde8683 BM |
1355 | /* Allocate the line buffer, storing its length into buflen. |
1356 | Note that if maxlen==0, indicating that arbitrary-length lines | |
1357 | are allowed, the buffer will be reallocated if this length is | |
1358 | insufficient; since 132 characters is the length of a standard | |
1359 | free-form line, we use that as a starting guess. */ | |
f56c5d5d TS |
1360 | if (maxlen > 0) |
1361 | buflen = maxlen; | |
1362 | else | |
1dde8683 | 1363 | buflen = 132; |
6de9cd9a | 1364 | |
00660189 | 1365 | *pbuf = gfc_get_wide_string (buflen + 1); |
f56c5d5d | 1366 | } |
6de9cd9a DN |
1367 | |
1368 | i = 0; | |
f56c5d5d | 1369 | buffer = *pbuf; |
6de9cd9a | 1370 | |
f2f5443c FXC |
1371 | if (first_char) |
1372 | c = *first_char; | |
1373 | else | |
1374 | c = getc (input); | |
1375 | ||
1376 | /* In order to not truncate preprocessor lines, we have to | |
1377 | remember that this is one. */ | |
1378 | preprocessor_flag = (c == '#' ? 1 : 0); | |
fa841200 | 1379 | |
6de9cd9a DN |
1380 | for (;;) |
1381 | { | |
6de9cd9a DN |
1382 | if (c == EOF) |
1383 | break; | |
f2f5443c | 1384 | |
6de9cd9a | 1385 | if (c == '\n') |
1526c4b5 JD |
1386 | { |
1387 | /* Check for illegal use of ampersand. See F95 Standard 3.3.1.3. */ | |
1388 | if (gfc_current_form == FORM_FREE | |
c284e499 | 1389 | && !seen_printable && seen_ampersand) |
1526c4b5 JD |
1390 | { |
1391 | if (pedantic) | |
edf1eac2 SK |
1392 | gfc_error_now ("'&' not allowed by itself in line %d", |
1393 | current_line); | |
1526c4b5 | 1394 | else |
edf1eac2 SK |
1395 | gfc_warning_now ("'&' not allowed by itself in line %d", |
1396 | current_line); | |
1526c4b5 JD |
1397 | } |
1398 | break; | |
1399 | } | |
6de9cd9a | 1400 | |
f2f5443c FXC |
1401 | if (c == '\r' || c == '\0') |
1402 | goto next_char; /* Gobble characters. */ | |
6de9cd9a | 1403 | |
1526c4b5 | 1404 | if (c == '&') |
1526c4b5 | 1405 | { |
c284e499 | 1406 | if (seen_ampersand) |
47b0b4fa TB |
1407 | { |
1408 | seen_ampersand = 0; | |
1409 | seen_printable = 1; | |
1410 | } | |
1526c4b5 | 1411 | else |
c284e499 | 1412 | seen_ampersand = 1; |
1526c4b5 JD |
1413 | } |
1414 | ||
bd5db9de | 1415 | if ((c != '&' && c != '!' && c != ' ') || (c == '!' && !seen_ampersand)) |
c284e499 JD |
1416 | seen_printable = 1; |
1417 | ||
840bd9f7 SK |
1418 | /* Is this a fixed-form comment? */ |
1419 | if (gfc_current_form == FORM_FIXED && i == 0 | |
1420 | && (c == '*' || c == 'c' || c == 'd')) | |
1421 | seen_comment = 1; | |
1422 | ||
fd1935d5 TB |
1423 | /* Vendor extension: "<tab>1" marks a continuation line. */ |
1424 | if (found_tab) | |
840bd9f7 | 1425 | { |
fd1935d5 TB |
1426 | found_tab = false; |
1427 | if (c >= '1' && c <= '9') | |
1428 | { | |
1429 | *(buffer-1) = c; | |
f2f5443c | 1430 | goto next_char; |
fd1935d5 TB |
1431 | } |
1432 | } | |
1433 | ||
1434 | if (gfc_current_form == FORM_FIXED && c == '\t' && i < 6) | |
1435 | { | |
1436 | found_tab = true; | |
1437 | ||
840bd9f7 SK |
1438 | if (!gfc_option.warn_tabs && seen_comment == 0 |
1439 | && current_line != linenum) | |
1440 | { | |
1441 | linenum = current_line; | |
fd1935d5 TB |
1442 | gfc_warning_now ("Nonconforming tab character in column %d " |
1443 | "of line %d", i+1, linenum); | |
840bd9f7 SK |
1444 | } |
1445 | ||
fd1935d5 | 1446 | while (i < 6) |
6de9cd9a DN |
1447 | { |
1448 | *buffer++ = ' '; | |
1449 | i++; | |
1450 | } | |
1451 | ||
f2f5443c | 1452 | goto next_char; |
6de9cd9a DN |
1453 | } |
1454 | ||
1455 | *buffer++ = c; | |
1456 | i++; | |
1457 | ||
d1e3d6ae | 1458 | if (maxlen == 0 || preprocessor_flag) |
f56c5d5d | 1459 | { |
d1e3d6ae JJ |
1460 | if (i >= buflen) |
1461 | { | |
1462 | /* Reallocate line buffer to double size to hold the | |
3fbab549 | 1463 | overlong line. */ |
d1e3d6ae | 1464 | buflen = buflen * 2; |
ece3f663 | 1465 | *pbuf = XRESIZEVEC (gfc_char_t, *pbuf, (buflen + 1)); |
edf1eac2 | 1466 | buffer = (*pbuf) + i; |
d1e3d6ae | 1467 | } |
f56c5d5d | 1468 | } |
d1e3d6ae | 1469 | else if (i >= maxlen) |
16ab8e74 | 1470 | { |
f56c5d5d | 1471 | /* Truncate the rest of the line. */ |
6de9cd9a DN |
1472 | for (;;) |
1473 | { | |
c4da1827 | 1474 | c = getc (input); |
9c747b97 DF |
1475 | if (c == '\r') |
1476 | continue; | |
1477 | ||
6de9cd9a DN |
1478 | if (c == '\n' || c == EOF) |
1479 | break; | |
a34938be RG |
1480 | |
1481 | trunc_flag = 1; | |
6de9cd9a DN |
1482 | } |
1483 | ||
f2f5443c FXC |
1484 | c = '\n'; |
1485 | continue; | |
6de9cd9a | 1486 | } |
f2f5443c FXC |
1487 | |
1488 | next_char: | |
1489 | c = getc (input); | |
6de9cd9a DN |
1490 | } |
1491 | ||
f56c5d5d TS |
1492 | /* Pad lines to the selected line length in fixed form. */ |
1493 | if (gfc_current_form == FORM_FIXED | |
043c2d9e | 1494 | && gfc_option.fixed_line_length != 0 |
f56c5d5d TS |
1495 | && !preprocessor_flag |
1496 | && c != EOF) | |
043c2d9e BF |
1497 | { |
1498 | while (i++ < maxlen) | |
1499 | *buffer++ = ' '; | |
1500 | } | |
f56c5d5d | 1501 | |
6de9cd9a | 1502 | *buffer = '\0'; |
d1e3d6ae | 1503 | *pbuflen = buflen; |
840bd9f7 | 1504 | current_line++; |
ba1defa5 RG |
1505 | |
1506 | return trunc_flag; | |
6de9cd9a DN |
1507 | } |
1508 | ||
1509 | ||
d4fa05b9 TS |
1510 | /* Get a gfc_file structure, initialize it and add it to |
1511 | the file stack. */ | |
1512 | ||
1513 | static gfc_file * | |
e0bcf78c | 1514 | get_file (const char *name, enum lc_reason reason ATTRIBUTE_UNUSED) |
d4fa05b9 TS |
1515 | { |
1516 | gfc_file *f; | |
1517 | ||
ece3f663 | 1518 | f = XCNEW (gfc_file); |
d4fa05b9 | 1519 | |
ece3f663 | 1520 | f->filename = xstrdup (name); |
d4fa05b9 TS |
1521 | |
1522 | f->next = file_head; | |
1523 | file_head = f; | |
1524 | ||
60332588 | 1525 | f->up = current_file; |
d4fa05b9 | 1526 | if (current_file != NULL) |
1b271c9b | 1527 | f->inclusion_line = current_file->line; |
d4fa05b9 | 1528 | |
5ffeb913 | 1529 | linemap_add (line_table, reason, false, f->filename, 1); |
c8cc8542 | 1530 | |
d4fa05b9 TS |
1531 | return f; |
1532 | } | |
1533 | ||
8fc541d3 | 1534 | |
d4fa05b9 TS |
1535 | /* Deal with a line from the C preprocessor. The |
1536 | initial octothorp has already been seen. */ | |
6de9cd9a DN |
1537 | |
1538 | static void | |
8fc541d3 | 1539 | preprocessor_line (gfc_char_t *c) |
6de9cd9a | 1540 | { |
d4fa05b9 TS |
1541 | bool flag[5]; |
1542 | int i, line; | |
8fc541d3 | 1543 | gfc_char_t *wide_filename; |
d4fa05b9 | 1544 | gfc_file *f; |
2d7c7df6 | 1545 | int escaped, unescape; |
8fc541d3 | 1546 | char *filename; |
6de9cd9a | 1547 | |
d4fa05b9 TS |
1548 | c++; |
1549 | while (*c == ' ' || *c == '\t') | |
1550 | c++; | |
6de9cd9a | 1551 | |
d4fa05b9 | 1552 | if (*c < '0' || *c > '9') |
fa841200 | 1553 | goto bad_cpp_line; |
6de9cd9a | 1554 | |
8fc541d3 | 1555 | line = wide_atoi (c); |
d4fa05b9 | 1556 | |
8fc541d3 | 1557 | c = wide_strchr (c, ' '); |
fa841200 | 1558 | if (c == NULL) |
4c3a6ca1 JJ |
1559 | { |
1560 | /* No file name given. Set new line number. */ | |
1561 | current_file->line = line; | |
1562 | return; | |
1563 | } | |
d7d528c8 ES |
1564 | |
1565 | /* Skip spaces. */ | |
1566 | while (*c == ' ' || *c == '\t') | |
1567 | c++; | |
1568 | ||
1569 | /* Skip quote. */ | |
1570 | if (*c != '"') | |
fa841200 | 1571 | goto bad_cpp_line; |
d7d528c8 ES |
1572 | ++c; |
1573 | ||
8fc541d3 | 1574 | wide_filename = c; |
d4fa05b9 | 1575 | |
d7d528c8 | 1576 | /* Make filename end at quote. */ |
2d7c7df6 | 1577 | unescape = 0; |
d7d528c8 | 1578 | escaped = false; |
edf1eac2 | 1579 | while (*c && ! (!escaped && *c == '"')) |
d7d528c8 ES |
1580 | { |
1581 | if (escaped) | |
edf1eac2 | 1582 | escaped = false; |
2d7c7df6 JJ |
1583 | else if (*c == '\\') |
1584 | { | |
1585 | escaped = true; | |
1586 | unescape++; | |
1587 | } | |
d7d528c8 ES |
1588 | ++c; |
1589 | } | |
1590 | ||
1591 | if (! *c) | |
fa841200 TS |
1592 | /* Preprocessor line has no closing quote. */ |
1593 | goto bad_cpp_line; | |
d7d528c8 | 1594 | |
d4fa05b9 TS |
1595 | *c++ = '\0'; |
1596 | ||
2d7c7df6 JJ |
1597 | /* Undo effects of cpp_quote_string. */ |
1598 | if (unescape) | |
1599 | { | |
8fc541d3 | 1600 | gfc_char_t *s = wide_filename; |
b0b14c7b | 1601 | gfc_char_t *d = gfc_get_wide_string (c - wide_filename - unescape); |
d7d528c8 | 1602 | |
8fc541d3 | 1603 | wide_filename = d; |
2d7c7df6 JJ |
1604 | while (*s) |
1605 | { | |
1606 | if (*s == '\\') | |
1607 | *d++ = *++s; | |
1608 | else | |
1609 | *d++ = *s; | |
1610 | s++; | |
1611 | } | |
1612 | *d = '\0'; | |
1613 | } | |
d7d528c8 | 1614 | |
d4fa05b9 | 1615 | /* Get flags. */ |
4c3a6ca1 | 1616 | |
1e39a151 | 1617 | flag[1] = flag[2] = flag[3] = flag[4] = false; |
6de9cd9a | 1618 | |
6de9cd9a DN |
1619 | for (;;) |
1620 | { | |
8fc541d3 | 1621 | c = wide_strchr (c, ' '); |
d4fa05b9 TS |
1622 | if (c == NULL) |
1623 | break; | |
6de9cd9a | 1624 | |
d4fa05b9 | 1625 | c++; |
8fc541d3 | 1626 | i = wide_atoi (c); |
6de9cd9a | 1627 | |
d4fa05b9 TS |
1628 | if (1 <= i && i <= 4) |
1629 | flag[i] = true; | |
1630 | } | |
4c3a6ca1 | 1631 | |
8fc541d3 FXC |
1632 | /* Convert the filename in wide characters into a filename in narrow |
1633 | characters. */ | |
00660189 | 1634 | filename = gfc_widechar_to_char (wide_filename, -1); |
8fc541d3 | 1635 | |
d4fa05b9 | 1636 | /* Interpret flags. */ |
4c3a6ca1 | 1637 | |
94b00ee4 | 1638 | if (flag[1]) /* Starting new file. */ |
d4fa05b9 | 1639 | { |
c8cc8542 | 1640 | f = get_file (filename, LC_RENAME); |
1b271c9b | 1641 | add_file_change (f->filename, f->inclusion_line); |
d4fa05b9 TS |
1642 | current_file = f; |
1643 | } | |
4c3a6ca1 | 1644 | |
d4fa05b9 TS |
1645 | if (flag[2]) /* Ending current file. */ |
1646 | { | |
94b00ee4 JJ |
1647 | if (!current_file->up |
1648 | || strcmp (current_file->up->filename, filename) != 0) | |
4c3a6ca1 JJ |
1649 | { |
1650 | gfc_warning_now ("%s:%d: file %s left but not entered", | |
1651 | current_file->filename, current_file->line, | |
1652 | filename); | |
2d7c7df6 | 1653 | if (unescape) |
8fc541d3 FXC |
1654 | gfc_free (wide_filename); |
1655 | gfc_free (filename); | |
4c3a6ca1 JJ |
1656 | return; |
1657 | } | |
ee07457b | 1658 | |
1b271c9b | 1659 | add_file_change (NULL, line); |
94b00ee4 | 1660 | current_file = current_file->up; |
ee07457b FXC |
1661 | linemap_add (line_table, LC_RENAME, false, current_file->filename, |
1662 | current_file->line); | |
d4fa05b9 | 1663 | } |
4c3a6ca1 | 1664 | |
d4fa05b9 TS |
1665 | /* The name of the file can be a temporary file produced by |
1666 | cpp. Replace the name if it is different. */ | |
4c3a6ca1 | 1667 | |
d4fa05b9 TS |
1668 | if (strcmp (current_file->filename, filename) != 0) |
1669 | { | |
95213750 LB |
1670 | /* FIXME: we leak the old filename because a pointer to it may be stored |
1671 | in the linemap. Alternative could be using GC or updating linemap to | |
1672 | point to the new name, but there is no API for that currently. */ | |
ece3f663 | 1673 | current_file->filename = xstrdup (filename); |
d4fa05b9 | 1674 | } |
fa841200 | 1675 | |
4c3a6ca1 JJ |
1676 | /* Set new line number. */ |
1677 | current_file->line = line; | |
2d7c7df6 | 1678 | if (unescape) |
8fc541d3 FXC |
1679 | gfc_free (wide_filename); |
1680 | gfc_free (filename); | |
fa841200 TS |
1681 | return; |
1682 | ||
1683 | bad_cpp_line: | |
4c3a6ca1 | 1684 | gfc_warning_now ("%s:%d: Illegal preprocessor directive", |
fa841200 TS |
1685 | current_file->filename, current_file->line); |
1686 | current_file->line++; | |
d4fa05b9 TS |
1687 | } |
1688 | ||
1689 | ||
17b1d2a0 | 1690 | static gfc_try load_file (const char *, const char *, bool); |
d4fa05b9 TS |
1691 | |
1692 | /* include_line()-- Checks a line buffer to see if it is an include | |
1693 | line. If so, we call load_file() recursively to load the included | |
1694 | file. We never return a syntax error because a statement like | |
1695 | "include = 5" is perfectly legal. We return false if no include was | |
1696 | processed or true if we matched an include. */ | |
1697 | ||
1698 | static bool | |
8fc541d3 | 1699 | include_line (gfc_char_t *line) |
d4fa05b9 | 1700 | { |
8fc541d3 FXC |
1701 | gfc_char_t quote, *c, *begin, *stop; |
1702 | char *filename; | |
9b9e4cd6 | 1703 | |
d4fa05b9 | 1704 | c = line; |
9b9e4cd6 JJ |
1705 | |
1706 | if (gfc_option.flag_openmp) | |
1707 | { | |
1708 | if (gfc_current_form == FORM_FREE) | |
1709 | { | |
1710 | while (*c == ' ' || *c == '\t') | |
1711 | c++; | |
1712 | if (*c == '!' && c[1] == '$' && (c[2] == ' ' || c[2] == '\t')) | |
1713 | c += 3; | |
1714 | } | |
1715 | else | |
1716 | { | |
1717 | if ((*c == '!' || *c == 'c' || *c == 'C' || *c == '*') | |
1718 | && c[1] == '$' && (c[2] == ' ' || c[2] == '\t')) | |
1719 | c += 3; | |
1720 | } | |
1721 | } | |
1722 | ||
d4fa05b9 TS |
1723 | while (*c == ' ' || *c == '\t') |
1724 | c++; | |
1725 | ||
00660189 | 1726 | if (gfc_wide_strncasecmp (c, "include", 7)) |
8fc541d3 | 1727 | return false; |
d4fa05b9 TS |
1728 | |
1729 | c += 7; | |
1730 | while (*c == ' ' || *c == '\t') | |
1731 | c++; | |
1732 | ||
1733 | /* Find filename between quotes. */ | |
1734 | ||
1735 | quote = *c++; | |
1736 | if (quote != '"' && quote != '\'') | |
1737 | return false; | |
1738 | ||
1739 | begin = c; | |
1740 | ||
1741 | while (*c != quote && *c != '\0') | |
1742 | c++; | |
1743 | ||
1744 | if (*c == '\0') | |
1745 | return false; | |
1746 | ||
1747 | stop = c++; | |
1748 | ||
1749 | while (*c == ' ' || *c == '\t') | |
1750 | c++; | |
1751 | ||
1752 | if (*c != '\0' && *c != '!') | |
1753 | return false; | |
1754 | ||
f7b529fa | 1755 | /* We have an include line at this point. */ |
d4fa05b9 TS |
1756 | |
1757 | *stop = '\0'; /* It's ok to trash the buffer, as this line won't be | |
1758 | read by anything else. */ | |
1759 | ||
00660189 | 1760 | filename = gfc_widechar_to_char (begin, -1); |
e513a086 | 1761 | load_file (filename, NULL, false); |
8fc541d3 | 1762 | gfc_free (filename); |
d4fa05b9 TS |
1763 | return true; |
1764 | } | |
1765 | ||
edf1eac2 | 1766 | |
d4fa05b9 TS |
1767 | /* Load a file into memory by calling load_line until the file ends. */ |
1768 | ||
17b1d2a0 | 1769 | static gfc_try |
e513a086 | 1770 | load_file (const char *realfilename, const char *displayedname, bool initial) |
d4fa05b9 | 1771 | { |
8fc541d3 | 1772 | gfc_char_t *line; |
d4fa05b9 TS |
1773 | gfc_linebuf *b; |
1774 | gfc_file *f; | |
1775 | FILE *input; | |
d1e3d6ae | 1776 | int len, line_len; |
caef7872 | 1777 | bool first_line; |
e513a086 TB |
1778 | const char *filename; |
1779 | ||
1780 | filename = displayedname ? displayedname : realfilename; | |
d4fa05b9 TS |
1781 | |
1782 | for (f = current_file; f; f = f->up) | |
1783 | if (strcmp (filename, f->filename) == 0) | |
1784 | { | |
0ee1b105 TB |
1785 | fprintf (stderr, "%s:%d: Error: File '%s' is being included " |
1786 | "recursively\n", current_file->filename, current_file->line, | |
1787 | filename); | |
d4fa05b9 TS |
1788 | return FAILURE; |
1789 | } | |
1790 | ||
1791 | if (initial) | |
1792 | { | |
2d7c7df6 JJ |
1793 | if (gfc_src_file) |
1794 | { | |
1795 | input = gfc_src_file; | |
1796 | gfc_src_file = NULL; | |
1797 | } | |
1798 | else | |
e513a086 | 1799 | input = gfc_open_file (realfilename); |
d4fa05b9 TS |
1800 | if (input == NULL) |
1801 | { | |
1802 | gfc_error_now ("Can't open file '%s'", filename); | |
1803 | return FAILURE; | |
1804 | } | |
1805 | } | |
1806 | else | |
1807 | { | |
e513a086 | 1808 | input = gfc_open_included_file (realfilename, false, false); |
d4fa05b9 TS |
1809 | if (input == NULL) |
1810 | { | |
0ee1b105 TB |
1811 | fprintf (stderr, "%s:%d: Error: Can't open included file '%s'\n", |
1812 | current_file->filename, current_file->line, filename); | |
d4fa05b9 TS |
1813 | return FAILURE; |
1814 | } | |
1815 | } | |
1816 | ||
1817 | /* Load the file. */ | |
1818 | ||
c8cc8542 | 1819 | f = get_file (filename, initial ? LC_RENAME : LC_ENTER); |
1b271c9b JJ |
1820 | if (!initial) |
1821 | add_file_change (f->filename, f->inclusion_line); | |
d4fa05b9 TS |
1822 | current_file = f; |
1823 | current_file->line = 1; | |
f56c5d5d | 1824 | line = NULL; |
d1e3d6ae | 1825 | line_len = 0; |
caef7872 | 1826 | first_line = true; |
d4fa05b9 | 1827 | |
2d7c7df6 JJ |
1828 | if (initial && gfc_src_preprocessor_lines[0]) |
1829 | { | |
1830 | preprocessor_line (gfc_src_preprocessor_lines[0]); | |
1831 | gfc_free (gfc_src_preprocessor_lines[0]); | |
1832 | gfc_src_preprocessor_lines[0] = NULL; | |
1833 | if (gfc_src_preprocessor_lines[1]) | |
1834 | { | |
1835 | preprocessor_line (gfc_src_preprocessor_lines[1]); | |
1836 | gfc_free (gfc_src_preprocessor_lines[1]); | |
1837 | gfc_src_preprocessor_lines[1] = NULL; | |
1838 | } | |
1839 | } | |
1840 | ||
16ab8e74 | 1841 | for (;;) |
d4fa05b9 | 1842 | { |
f2f5443c | 1843 | int trunc = load_line (input, &line, &line_len, NULL); |
d4fa05b9 | 1844 | |
8fc541d3 | 1845 | len = gfc_wide_strlen (line); |
6de9cd9a DN |
1846 | if (feof (input) && len == 0) |
1847 | break; | |
1848 | ||
caef7872 FXC |
1849 | /* If this is the first line of the file, it can contain a byte |
1850 | order mark (BOM), which we will ignore: | |
1851 | FF FE is UTF-16 little endian, | |
1852 | FE FF is UTF-16 big endian, | |
1853 | EF BB BF is UTF-8. */ | |
1854 | if (first_line | |
8fc541d3 FXC |
1855 | && ((line_len >= 2 && line[0] == (unsigned char) '\xFF' |
1856 | && line[1] == (unsigned char) '\xFE') | |
1857 | || (line_len >= 2 && line[0] == (unsigned char) '\xFE' | |
1858 | && line[1] == (unsigned char) '\xFF') | |
1859 | || (line_len >= 3 && line[0] == (unsigned char) '\xEF' | |
1860 | && line[1] == (unsigned char) '\xBB' | |
1861 | && line[2] == (unsigned char) '\xBF'))) | |
caef7872 | 1862 | { |
8fc541d3 | 1863 | int n = line[1] == (unsigned char) '\xBB' ? 3 : 2; |
7b901ac4 | 1864 | gfc_char_t *new_char = gfc_get_wide_string (line_len); |
caef7872 | 1865 | |
7b901ac4 | 1866 | wide_strcpy (new_char, &line[n]); |
caef7872 | 1867 | gfc_free (line); |
7b901ac4 | 1868 | line = new_char; |
caef7872 FXC |
1869 | len -= n; |
1870 | } | |
1871 | ||
d4fa05b9 TS |
1872 | /* There are three things this line can be: a line of Fortran |
1873 | source, an include line or a C preprocessor directive. */ | |
6de9cd9a | 1874 | |
d4fa05b9 TS |
1875 | if (line[0] == '#') |
1876 | { | |
9e8a6720 FXC |
1877 | /* When -g3 is specified, it's possible that we emit #define |
1878 | and #undef lines, which we need to pass to the middle-end | |
1879 | so that it can emit correct debug info. */ | |
1880 | if (debug_info_level == DINFO_LEVEL_VERBOSE | |
8fc541d3 FXC |
1881 | && (wide_strncmp (line, "#define ", 8) == 0 |
1882 | || wide_strncmp (line, "#undef ", 7) == 0)) | |
9e8a6720 FXC |
1883 | ; |
1884 | else | |
1885 | { | |
1886 | preprocessor_line (line); | |
1887 | continue; | |
1888 | } | |
d4fa05b9 | 1889 | } |
6de9cd9a | 1890 | |
caef7872 FXC |
1891 | /* Preprocessed files have preprocessor lines added before the byte |
1892 | order mark, so first_line is not about the first line of the file | |
1893 | but the first line that's not a preprocessor line. */ | |
1894 | first_line = false; | |
1895 | ||
d4fa05b9 TS |
1896 | if (include_line (line)) |
1897 | { | |
1898 | current_file->line++; | |
1899 | continue; | |
6de9cd9a DN |
1900 | } |
1901 | ||
d4fa05b9 TS |
1902 | /* Add line. */ |
1903 | ||
ece3f663 KG |
1904 | b = (gfc_linebuf *) gfc_getmem (gfc_linebuf_header_size |
1905 | + (len + 1) * sizeof (gfc_char_t)); | |
d4fa05b9 | 1906 | |
c8cc8542 | 1907 | b->location |
5ffeb913 | 1908 | = linemap_line_start (line_table, current_file->line++, 120); |
d4fa05b9 | 1909 | b->file = current_file; |
ba1defa5 | 1910 | b->truncated = trunc; |
8fc541d3 | 1911 | wide_strcpy (b->line, line); |
d4fa05b9 TS |
1912 | |
1913 | if (line_head == NULL) | |
1914 | line_head = b; | |
1915 | else | |
1916 | line_tail->next = b; | |
1917 | ||
1918 | line_tail = b; | |
1b271c9b JJ |
1919 | |
1920 | while (file_changes_cur < file_changes_count) | |
1921 | file_changes[file_changes_cur++].lb = b; | |
6de9cd9a | 1922 | } |
d4fa05b9 | 1923 | |
f56c5d5d TS |
1924 | /* Release the line buffer allocated in load_line. */ |
1925 | gfc_free (line); | |
1926 | ||
d4fa05b9 TS |
1927 | fclose (input); |
1928 | ||
1b271c9b JJ |
1929 | if (!initial) |
1930 | add_file_change (NULL, current_file->inclusion_line + 1); | |
d4fa05b9 | 1931 | current_file = current_file->up; |
5ffeb913 | 1932 | linemap_add (line_table, LC_LEAVE, 0, NULL, 0); |
d4fa05b9 | 1933 | return SUCCESS; |
6de9cd9a DN |
1934 | } |
1935 | ||
1936 | ||
d4fa05b9 | 1937 | /* Open a new file and start scanning from that file. Returns SUCCESS |
df2fba9e | 1938 | if everything went OK, FAILURE otherwise. If form == FORM_UNKNOWN |
d4fa05b9 TS |
1939 | it tries to determine the source form from the filename, defaulting |
1940 | to free form. */ | |
6de9cd9a | 1941 | |
17b1d2a0 | 1942 | gfc_try |
e0bcf78c | 1943 | gfc_new_file (void) |
6de9cd9a | 1944 | { |
17b1d2a0 | 1945 | gfc_try result; |
6de9cd9a | 1946 | |
670637ee DF |
1947 | if (gfc_cpp_enabled ()) |
1948 | { | |
1949 | result = gfc_cpp_preprocess (gfc_source_file); | |
1950 | if (!gfc_cpp_preprocess_only ()) | |
e513a086 | 1951 | result = load_file (gfc_cpp_temporary_file (), gfc_source_file, true); |
670637ee DF |
1952 | } |
1953 | else | |
e513a086 | 1954 | result = load_file (gfc_source_file, NULL, true); |
6de9cd9a | 1955 | |
63645982 TS |
1956 | gfc_current_locus.lb = line_head; |
1957 | gfc_current_locus.nextc = (line_head == NULL) ? NULL : line_head->line; | |
6de9cd9a | 1958 | |
d4fa05b9 TS |
1959 | #if 0 /* Debugging aid. */ |
1960 | for (; line_head; line_head = line_head->next) | |
6c1abb5c FXC |
1961 | printf ("%s:%3d %s\n", LOCATION_FILE (line_head->location), |
1962 | LOCATION_LINE (line_head->location), line_head->line); | |
6de9cd9a | 1963 | |
d4fa05b9 TS |
1964 | exit (0); |
1965 | #endif | |
6de9cd9a | 1966 | |
d4fa05b9 | 1967 | return result; |
6de9cd9a | 1968 | } |
2d7c7df6 JJ |
1969 | |
1970 | static char * | |
1971 | unescape_filename (const char *ptr) | |
1972 | { | |
1973 | const char *p = ptr, *s; | |
1974 | char *d, *ret; | |
1975 | int escaped, unescape = 0; | |
1976 | ||
1977 | /* Make filename end at quote. */ | |
1978 | escaped = false; | |
1979 | while (*p && ! (! escaped && *p == '"')) | |
1980 | { | |
1981 | if (escaped) | |
1982 | escaped = false; | |
1983 | else if (*p == '\\') | |
1984 | { | |
1985 | escaped = true; | |
1986 | unescape++; | |
1987 | } | |
1988 | ++p; | |
1989 | } | |
1990 | ||
edf1eac2 | 1991 | if (!*p || p[1]) |
2d7c7df6 JJ |
1992 | return NULL; |
1993 | ||
1994 | /* Undo effects of cpp_quote_string. */ | |
1995 | s = ptr; | |
ece3f663 | 1996 | d = XCNEWVEC (char, p + 1 - ptr - unescape); |
2d7c7df6 JJ |
1997 | ret = d; |
1998 | ||
1999 | while (s != p) | |
2000 | { | |
2001 | if (*s == '\\') | |
2002 | *d++ = *++s; | |
2003 | else | |
2004 | *d++ = *s; | |
2005 | s++; | |
2006 | } | |
2007 | *d = '\0'; | |
2008 | return ret; | |
2009 | } | |
2010 | ||
2011 | /* For preprocessed files, if the first tokens are of the form # NUM. | |
2012 | handle the directives so we know the original file name. */ | |
2013 | ||
2014 | const char * | |
2015 | gfc_read_orig_filename (const char *filename, const char **canon_source_file) | |
2016 | { | |
2017 | int c, len; | |
8fc541d3 | 2018 | char *dirname, *tmp; |
2d7c7df6 JJ |
2019 | |
2020 | gfc_src_file = gfc_open_file (filename); | |
2021 | if (gfc_src_file == NULL) | |
2022 | return NULL; | |
2023 | ||
c4da1827 | 2024 | c = getc (gfc_src_file); |
2d7c7df6 JJ |
2025 | |
2026 | if (c != '#') | |
2027 | return NULL; | |
2028 | ||
2029 | len = 0; | |
f2f5443c | 2030 | load_line (gfc_src_file, &gfc_src_preprocessor_lines[0], &len, &c); |
2d7c7df6 | 2031 | |
8fc541d3 | 2032 | if (wide_strncmp (gfc_src_preprocessor_lines[0], "# 1 \"", 5) != 0) |
2d7c7df6 JJ |
2033 | return NULL; |
2034 | ||
00660189 | 2035 | tmp = gfc_widechar_to_char (&gfc_src_preprocessor_lines[0][5], -1); |
8fc541d3 FXC |
2036 | filename = unescape_filename (tmp); |
2037 | gfc_free (tmp); | |
2d7c7df6 JJ |
2038 | if (filename == NULL) |
2039 | return NULL; | |
2040 | ||
c4da1827 | 2041 | c = getc (gfc_src_file); |
2d7c7df6 JJ |
2042 | |
2043 | if (c != '#') | |
2044 | return filename; | |
2045 | ||
2046 | len = 0; | |
f2f5443c | 2047 | load_line (gfc_src_file, &gfc_src_preprocessor_lines[1], &len, &c); |
2d7c7df6 | 2048 | |
8fc541d3 | 2049 | if (wide_strncmp (gfc_src_preprocessor_lines[1], "# 1 \"", 5) != 0) |
2d7c7df6 JJ |
2050 | return filename; |
2051 | ||
00660189 | 2052 | tmp = gfc_widechar_to_char (&gfc_src_preprocessor_lines[1][5], -1); |
8fc541d3 FXC |
2053 | dirname = unescape_filename (tmp); |
2054 | gfc_free (tmp); | |
2d7c7df6 JJ |
2055 | if (dirname == NULL) |
2056 | return filename; | |
2057 | ||
2058 | len = strlen (dirname); | |
2059 | if (len < 3 || dirname[len - 1] != '/' || dirname[len - 2] != '/') | |
2060 | { | |
2061 | gfc_free (dirname); | |
2062 | return filename; | |
2063 | } | |
2064 | dirname[len - 2] = '\0'; | |
2065 | set_src_pwd (dirname); | |
2066 | ||
2067 | if (! IS_ABSOLUTE_PATH (filename)) | |
2068 | { | |
ece3f663 | 2069 | char *p = XCNEWVEC (char, len + strlen (filename)); |
2d7c7df6 JJ |
2070 | |
2071 | memcpy (p, dirname, len - 2); | |
2072 | p[len - 2] = '/'; | |
2073 | strcpy (p + len - 1, filename); | |
2074 | *canon_source_file = p; | |
2075 | } | |
2076 | ||
2077 | gfc_free (dirname); | |
2078 | return filename; | |
2079 | } |