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re PR fortran/31270 (print subscript value and array bounds when out-of-bounds error...
[gcc.git] / gcc / fortran / io.c
1 /* Deal with I/O statements & related stuff.
2 Copyright (C) 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007
3 Free Software Foundation, Inc.
4 Contributed by Andy Vaught
5
6 This file is part of GCC.
7
8 GCC is free software; you can redistribute it and/or modify it under
9 the terms of the GNU General Public License as published by the Free
10 Software Foundation; either version 3, or (at your option) any later
11 version.
12
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.
17
18 You should have received a copy of the GNU General Public License
19 along with GCC; see the file COPYING3. If not see
20 <http://www.gnu.org/licenses/>. */
21
22 #include "config.h"
23 #include "system.h"
24 #include "flags.h"
25 #include "gfortran.h"
26 #include "match.h"
27 #include "parse.h"
28
29 gfc_st_label
30 format_asterisk = {0, NULL, NULL, -1, ST_LABEL_FORMAT, ST_LABEL_FORMAT, NULL,
31 0, {NULL, NULL}};
32
33 typedef struct
34 {
35 const char *name, *spec;
36 bt type;
37 }
38 io_tag;
39
40 static const io_tag
41 tag_file = { "FILE", " file = %e", BT_CHARACTER },
42 tag_status = { "STATUS", " status = %e", BT_CHARACTER},
43 tag_e_access = {"ACCESS", " access = %e", BT_CHARACTER},
44 tag_e_form = {"FORM", " form = %e", BT_CHARACTER},
45 tag_e_recl = {"RECL", " recl = %e", BT_INTEGER},
46 tag_e_blank = {"BLANK", " blank = %e", BT_CHARACTER},
47 tag_e_position = {"POSITION", " position = %e", BT_CHARACTER},
48 tag_e_action = {"ACTION", " action = %e", BT_CHARACTER},
49 tag_e_delim = {"DELIM", " delim = %e", BT_CHARACTER},
50 tag_e_pad = {"PAD", " pad = %e", BT_CHARACTER},
51 tag_unit = {"UNIT", " unit = %e", BT_INTEGER},
52 tag_advance = {"ADVANCE", " advance = %e", BT_CHARACTER},
53 tag_rec = {"REC", " rec = %e", BT_INTEGER},
54 tag_spos = {"POSITION", " pos = %e", BT_INTEGER},
55 tag_format = {"FORMAT", NULL, BT_CHARACTER},
56 tag_iomsg = {"IOMSG", " iomsg = %e", BT_CHARACTER},
57 tag_iostat = {"IOSTAT", " iostat = %v", BT_INTEGER},
58 tag_size = {"SIZE", " size = %v", BT_INTEGER},
59 tag_exist = {"EXIST", " exist = %v", BT_LOGICAL},
60 tag_opened = {"OPENED", " opened = %v", BT_LOGICAL},
61 tag_named = {"NAMED", " named = %v", BT_LOGICAL},
62 tag_name = {"NAME", " name = %v", BT_CHARACTER},
63 tag_number = {"NUMBER", " number = %v", BT_INTEGER},
64 tag_s_access = {"ACCESS", " access = %v", BT_CHARACTER},
65 tag_sequential = {"SEQUENTIAL", " sequential = %v", BT_CHARACTER},
66 tag_direct = {"DIRECT", " direct = %v", BT_CHARACTER},
67 tag_s_form = {"FORM", " form = %v", BT_CHARACTER},
68 tag_formatted = {"FORMATTED", " formatted = %v", BT_CHARACTER},
69 tag_unformatted = {"UNFORMATTED", " unformatted = %v", BT_CHARACTER},
70 tag_s_recl = {"RECL", " recl = %v", BT_INTEGER},
71 tag_nextrec = {"NEXTREC", " nextrec = %v", BT_INTEGER},
72 tag_s_blank = {"BLANK", " blank = %v", BT_CHARACTER},
73 tag_s_position = {"POSITION", " position = %v", BT_CHARACTER},
74 tag_s_action = {"ACTION", " action = %v", BT_CHARACTER},
75 tag_read = {"READ", " read = %v", BT_CHARACTER},
76 tag_write = {"WRITE", " write = %v", BT_CHARACTER},
77 tag_readwrite = {"READWRITE", " readwrite = %v", BT_CHARACTER},
78 tag_s_delim = {"DELIM", " delim = %v", BT_CHARACTER},
79 tag_s_pad = {"PAD", " pad = %v", BT_CHARACTER},
80 tag_iolength = {"IOLENGTH", " iolength = %v", BT_INTEGER},
81 tag_convert = {"CONVERT", " convert = %e", BT_CHARACTER},
82 tag_strm_out = {"POS", " pos = %v", BT_INTEGER},
83 tag_err = {"ERR", " err = %l", BT_UNKNOWN},
84 tag_end = {"END", " end = %l", BT_UNKNOWN},
85 tag_eor = {"EOR", " eor = %l", BT_UNKNOWN};
86
87 static gfc_dt *current_dt;
88
89 #define RESOLVE_TAG(x, y) if (resolve_tag(x, y) == FAILURE) return FAILURE;
90
91
92 /**************** Fortran 95 FORMAT parser *****************/
93
94 /* FORMAT tokens returned by format_lex(). */
95 typedef enum
96 {
97 FMT_NONE, FMT_UNKNOWN, FMT_SIGNED_INT, FMT_ZERO, FMT_POSINT, FMT_PERIOD,
98 FMT_COMMA, FMT_COLON, FMT_SLASH, FMT_DOLLAR, FMT_POS, FMT_LPAREN,
99 FMT_RPAREN, FMT_X, FMT_SIGN, FMT_BLANK, FMT_CHAR, FMT_P, FMT_IBOZ, FMT_F,
100 FMT_E, FMT_EXT, FMT_G, FMT_L, FMT_A, FMT_D, FMT_H, FMT_END, FMT_ERROR
101 }
102 format_token;
103
104 /* Local variables for checking format strings. The saved_token is
105 used to back up by a single format token during the parsing
106 process. */
107 static char *format_string;
108 static int format_length, use_last_char;
109
110 static format_token saved_token;
111
112 static enum
113 { MODE_STRING, MODE_FORMAT, MODE_COPY }
114 mode;
115
116
117 /* Return the next character in the format string. */
118
119 static char
120 next_char (int in_string)
121 {
122 static char c;
123
124 if (use_last_char)
125 {
126 use_last_char = 0;
127 return c;
128 }
129
130 format_length++;
131
132 if (mode == MODE_STRING)
133 c = *format_string++;
134 else
135 {
136 c = gfc_next_char_literal (in_string);
137 if (c == '\n')
138 c = '\0';
139 }
140
141 if (gfc_option.flag_backslash && c == '\\')
142 {
143 int tmp;
144 locus old_locus = gfc_current_locus;
145
146 /* Use a temp variable to avoid side effects from gfc_match_special_char
147 since it uses an int * for its argument. */
148 tmp = (int)c;
149
150 if (gfc_match_special_char (&tmp) == MATCH_NO)
151 gfc_current_locus = old_locus;
152
153 c = (char)tmp;
154
155 if (!(gfc_option.allow_std & GFC_STD_GNU) && !inhibit_warnings)
156 gfc_warning ("Extension: backslash character at %C");
157 }
158
159 if (mode == MODE_COPY)
160 *format_string++ = c;
161
162 c = TOUPPER (c);
163 return c;
164 }
165
166
167 /* Back up one character position. Only works once. */
168
169 static void
170 unget_char (void)
171 {
172 use_last_char = 1;
173 }
174
175 /* Eat up the spaces and return a character. */
176
177 static char
178 next_char_not_space (bool *error)
179 {
180 char c;
181 do
182 {
183 c = next_char (0);
184 if (c == '\t')
185 {
186 if (gfc_option.allow_std & GFC_STD_GNU)
187 gfc_warning ("Extension: Tab character in format at %C");
188 else
189 {
190 gfc_error ("Extension: Tab character in format at %C");
191 *error = true;
192 return c;
193 }
194 }
195 }
196 while (gfc_is_whitespace (c));
197 return c;
198 }
199
200 static int value = 0;
201
202 /* Simple lexical analyzer for getting the next token in a FORMAT
203 statement. */
204
205 static format_token
206 format_lex (void)
207 {
208 format_token token;
209 char c, delim;
210 int zflag;
211 int negative_flag;
212 bool error = false;
213
214 if (saved_token != FMT_NONE)
215 {
216 token = saved_token;
217 saved_token = FMT_NONE;
218 return token;
219 }
220
221 c = next_char_not_space (&error);
222
223 negative_flag = 0;
224 switch (c)
225 {
226 case '-':
227 negative_flag = 1;
228 case '+':
229 c = next_char_not_space (&error);
230 if (!ISDIGIT (c))
231 {
232 token = FMT_UNKNOWN;
233 break;
234 }
235
236 value = c - '0';
237
238 do
239 {
240 c = next_char_not_space (&error);
241 if (ISDIGIT (c))
242 value = 10 * value + c - '0';
243 }
244 while (ISDIGIT (c));
245
246 unget_char ();
247
248 if (negative_flag)
249 value = -value;
250
251 token = FMT_SIGNED_INT;
252 break;
253
254 case '0':
255 case '1':
256 case '2':
257 case '3':
258 case '4':
259 case '5':
260 case '6':
261 case '7':
262 case '8':
263 case '9':
264 zflag = (c == '0');
265
266 value = c - '0';
267
268 do
269 {
270 c = next_char_not_space (&error);
271 if (ISDIGIT (c))
272 {
273 value = 10 * value + c - '0';
274 if (c != '0')
275 zflag = 0;
276 }
277 }
278 while (ISDIGIT (c));
279
280 unget_char ();
281 token = zflag ? FMT_ZERO : FMT_POSINT;
282 break;
283
284 case '.':
285 token = FMT_PERIOD;
286 break;
287
288 case ',':
289 token = FMT_COMMA;
290 break;
291
292 case ':':
293 token = FMT_COLON;
294 break;
295
296 case '/':
297 token = FMT_SLASH;
298 break;
299
300 case '$':
301 token = FMT_DOLLAR;
302 break;
303
304 case 'T':
305 c = next_char_not_space (&error);
306 if (c != 'L' && c != 'R')
307 unget_char ();
308
309 token = FMT_POS;
310 break;
311
312 case '(':
313 token = FMT_LPAREN;
314 break;
315
316 case ')':
317 token = FMT_RPAREN;
318 break;
319
320 case 'X':
321 token = FMT_X;
322 break;
323
324 case 'S':
325 c = next_char_not_space (&error);
326 if (c != 'P' && c != 'S')
327 unget_char ();
328
329 token = FMT_SIGN;
330 break;
331
332 case 'B':
333 c = next_char_not_space (&error);
334 if (c == 'N' || c == 'Z')
335 token = FMT_BLANK;
336 else
337 {
338 unget_char ();
339 token = FMT_IBOZ;
340 }
341
342 break;
343
344 case '\'':
345 case '"':
346 delim = c;
347
348 value = 0;
349
350 for (;;)
351 {
352 c = next_char (1);
353 if (c == '\0')
354 {
355 token = FMT_END;
356 break;
357 }
358
359 if (c == delim)
360 {
361 c = next_char (1);
362
363 if (c == '\0')
364 {
365 token = FMT_END;
366 break;
367 }
368
369 if (c != delim)
370 {
371 unget_char ();
372 token = FMT_CHAR;
373 break;
374 }
375 }
376 value++;
377 }
378 break;
379
380 case 'P':
381 token = FMT_P;
382 break;
383
384 case 'I':
385 case 'O':
386 case 'Z':
387 token = FMT_IBOZ;
388 break;
389
390 case 'F':
391 token = FMT_F;
392 break;
393
394 case 'E':
395 c = next_char_not_space (&error);
396 if (c == 'N' || c == 'S')
397 token = FMT_EXT;
398 else
399 {
400 token = FMT_E;
401 unget_char ();
402 }
403
404 break;
405
406 case 'G':
407 token = FMT_G;
408 break;
409
410 case 'H':
411 token = FMT_H;
412 break;
413
414 case 'L':
415 token = FMT_L;
416 break;
417
418 case 'A':
419 token = FMT_A;
420 break;
421
422 case 'D':
423 token = FMT_D;
424 break;
425
426 case '\0':
427 token = FMT_END;
428 break;
429
430 default:
431 token = FMT_UNKNOWN;
432 break;
433 }
434
435 if (error)
436 return FMT_ERROR;
437
438 return token;
439 }
440
441
442 /* Check a format statement. The format string, either from a FORMAT
443 statement or a constant in an I/O statement has already been parsed
444 by itself, and we are checking it for validity. The dual origin
445 means that the warning message is a little less than great. */
446
447 static try
448 check_format (bool is_input)
449 {
450 const char *posint_required = _("Positive width required");
451 const char *nonneg_required = _("Nonnegative width required");
452 const char *unexpected_element = _("Unexpected element");
453 const char *unexpected_end = _("Unexpected end of format string");
454
455 const char *error;
456 format_token t, u;
457 int level;
458 int repeat;
459 try rv;
460
461 use_last_char = 0;
462 saved_token = FMT_NONE;
463 level = 0;
464 repeat = 0;
465 rv = SUCCESS;
466
467 t = format_lex ();
468 if (t == FMT_ERROR)
469 goto fail;
470 if (t != FMT_LPAREN)
471 {
472 error = _("Missing leading left parenthesis");
473 goto syntax;
474 }
475
476 t = format_lex ();
477 if (t == FMT_ERROR)
478 goto fail;
479 if (t == FMT_RPAREN)
480 goto finished; /* Empty format is legal */
481 saved_token = t;
482
483 format_item:
484 /* In this state, the next thing has to be a format item. */
485 t = format_lex ();
486 if (t == FMT_ERROR)
487 goto fail;
488 format_item_1:
489 switch (t)
490 {
491 case FMT_POSINT:
492 repeat = value;
493 t = format_lex ();
494 if (t == FMT_ERROR)
495 goto fail;
496 if (t == FMT_LPAREN)
497 {
498 level++;
499 goto format_item;
500 }
501
502 if (t == FMT_SLASH)
503 goto optional_comma;
504
505 goto data_desc;
506
507 case FMT_LPAREN:
508 level++;
509 goto format_item;
510
511 case FMT_SIGNED_INT:
512 case FMT_ZERO:
513 /* Signed integer can only precede a P format. */
514 t = format_lex ();
515 if (t == FMT_ERROR)
516 goto fail;
517 if (t != FMT_P)
518 {
519 error = _("Expected P edit descriptor");
520 goto syntax;
521 }
522
523 goto data_desc;
524
525 case FMT_P:
526 /* P requires a prior number. */
527 error = _("P descriptor requires leading scale factor");
528 goto syntax;
529
530 case FMT_X:
531 /* X requires a prior number if we're being pedantic. */
532 if (gfc_notify_std (GFC_STD_GNU, "Extension: X descriptor "
533 "requires leading space count at %C")
534 == FAILURE)
535 return FAILURE;
536 goto between_desc;
537
538 case FMT_SIGN:
539 case FMT_BLANK:
540 goto between_desc;
541
542 case FMT_CHAR:
543 goto extension_optional_comma;
544
545 case FMT_COLON:
546 case FMT_SLASH:
547 goto optional_comma;
548
549 case FMT_DOLLAR:
550 t = format_lex ();
551 if (t == FMT_ERROR)
552 goto fail;
553
554 if (gfc_notify_std (GFC_STD_GNU, "Extension: $ descriptor at %C")
555 == FAILURE)
556 return FAILURE;
557 if (t != FMT_RPAREN || level > 0)
558 {
559 gfc_warning ("$ should be the last specifier in format at %C");
560 goto optional_comma_1;
561 }
562
563 goto finished;
564
565 case FMT_POS:
566 case FMT_IBOZ:
567 case FMT_F:
568 case FMT_E:
569 case FMT_EXT:
570 case FMT_G:
571 case FMT_L:
572 case FMT_A:
573 case FMT_D:
574 case FMT_H:
575 goto data_desc;
576
577 case FMT_END:
578 error = unexpected_end;
579 goto syntax;
580
581 default:
582 error = unexpected_element;
583 goto syntax;
584 }
585
586 data_desc:
587 /* In this state, t must currently be a data descriptor.
588 Deal with things that can/must follow the descriptor. */
589 switch (t)
590 {
591 case FMT_SIGN:
592 case FMT_BLANK:
593 case FMT_X:
594 break;
595
596 case FMT_P:
597 if (pedantic)
598 {
599 t = format_lex ();
600 if (t == FMT_ERROR)
601 goto fail;
602 if (t == FMT_POSINT)
603 {
604 error = _("Repeat count cannot follow P descriptor");
605 goto syntax;
606 }
607
608 saved_token = t;
609 }
610
611 goto optional_comma;
612
613 case FMT_POS:
614 case FMT_L:
615 t = format_lex ();
616 if (t == FMT_ERROR)
617 goto fail;
618 if (t == FMT_POSINT)
619 break;
620
621 switch (gfc_notification_std (GFC_STD_GNU))
622 {
623 case WARNING:
624 gfc_warning ("Extension: Missing positive width after L "
625 "descriptor at %C");
626 saved_token = t;
627 break;
628
629 case ERROR:
630 error = posint_required;
631 goto syntax;
632
633 case SILENT:
634 saved_token = t;
635 break;
636
637 default:
638 gcc_unreachable ();
639 }
640 break;
641
642 case FMT_A:
643 t = format_lex ();
644 if (t == FMT_ERROR)
645 goto fail;
646 if (t != FMT_POSINT)
647 saved_token = t;
648 break;
649
650 case FMT_D:
651 case FMT_E:
652 case FMT_G:
653 case FMT_EXT:
654 u = format_lex ();
655 if (u == FMT_ERROR)
656 goto fail;
657 if (u != FMT_POSINT)
658 {
659 error = posint_required;
660 goto syntax;
661 }
662
663 u = format_lex ();
664 if (u == FMT_ERROR)
665 goto fail;
666 if (u != FMT_PERIOD)
667 {
668 /* Warn if -std=legacy, otherwise error. */
669 if (gfc_option.warn_std != 0)
670 gfc_error_now ("Period required in format specifier at %C");
671 else
672 gfc_warning ("Period required in format specifier at %C");
673 saved_token = u;
674 break;
675 }
676
677 u = format_lex ();
678 if (u == FMT_ERROR)
679 goto fail;
680 if (u != FMT_ZERO && u != FMT_POSINT)
681 {
682 error = nonneg_required;
683 goto syntax;
684 }
685
686 if (t == FMT_D)
687 break;
688
689 /* Look for optional exponent. */
690 u = format_lex ();
691 if (u == FMT_ERROR)
692 goto fail;
693 if (u != FMT_E)
694 {
695 saved_token = u;
696 }
697 else
698 {
699 u = format_lex ();
700 if (u == FMT_ERROR)
701 goto fail;
702 if (u != FMT_POSINT)
703 {
704 error = _("Positive exponent width required");
705 goto syntax;
706 }
707 }
708
709 break;
710
711 case FMT_F:
712 t = format_lex ();
713 if (t == FMT_ERROR)
714 goto fail;
715 if (t != FMT_ZERO && t != FMT_POSINT)
716 {
717 error = nonneg_required;
718 goto syntax;
719 }
720 else if (is_input && t == FMT_ZERO)
721 {
722 error = posint_required;
723 goto syntax;
724 }
725
726 t = format_lex ();
727 if (t == FMT_ERROR)
728 goto fail;
729 if (t != FMT_PERIOD)
730 {
731 /* Warn if -std=legacy, otherwise error. */
732 if (gfc_option.warn_std != 0)
733 gfc_error_now ("Period required in format specifier at %C");
734 else
735 gfc_warning ("Period required in format specifier at %C");
736 saved_token = t;
737 break;
738 }
739
740 t = format_lex ();
741 if (t == FMT_ERROR)
742 goto fail;
743 if (t != FMT_ZERO && t != FMT_POSINT)
744 {
745 error = nonneg_required;
746 goto syntax;
747 }
748
749 break;
750
751 case FMT_H:
752 if (!(gfc_option.allow_std & GFC_STD_GNU) && !inhibit_warnings)
753 gfc_warning ("The H format specifier at %C is"
754 " a Fortran 95 deleted feature");
755
756 if(mode == MODE_STRING)
757 {
758 format_string += value;
759 format_length -= value;
760 }
761 else
762 {
763 while (repeat >0)
764 {
765 next_char (1);
766 repeat -- ;
767 }
768 }
769 break;
770
771 case FMT_IBOZ:
772 t = format_lex ();
773 if (t == FMT_ERROR)
774 goto fail;
775 if (t != FMT_ZERO && t != FMT_POSINT)
776 {
777 error = nonneg_required;
778 goto syntax;
779 }
780 else if (is_input && t == FMT_ZERO)
781 {
782 error = posint_required;
783 goto syntax;
784 }
785
786 t = format_lex ();
787 if (t == FMT_ERROR)
788 goto fail;
789 if (t != FMT_PERIOD)
790 {
791 saved_token = t;
792 }
793 else
794 {
795 t = format_lex ();
796 if (t == FMT_ERROR)
797 goto fail;
798 if (t != FMT_ZERO && t != FMT_POSINT)
799 {
800 error = nonneg_required;
801 goto syntax;
802 }
803 }
804
805 break;
806
807 default:
808 error = unexpected_element;
809 goto syntax;
810 }
811
812 between_desc:
813 /* Between a descriptor and what comes next. */
814 t = format_lex ();
815 if (t == FMT_ERROR)
816 goto fail;
817 switch (t)
818 {
819
820 case FMT_COMMA:
821 goto format_item;
822
823 case FMT_RPAREN:
824 level--;
825 if (level < 0)
826 goto finished;
827 goto between_desc;
828
829 case FMT_COLON:
830 case FMT_SLASH:
831 goto optional_comma;
832
833 case FMT_END:
834 error = unexpected_end;
835 goto syntax;
836
837 default:
838 if (gfc_notify_std (GFC_STD_GNU, "Extension: Missing comma at %C")
839 == FAILURE)
840 return FAILURE;
841 goto format_item_1;
842 }
843
844 optional_comma:
845 /* Optional comma is a weird between state where we've just finished
846 reading a colon, slash, dollar or P descriptor. */
847 t = format_lex ();
848 if (t == FMT_ERROR)
849 goto fail;
850 optional_comma_1:
851 switch (t)
852 {
853 case FMT_COMMA:
854 break;
855
856 case FMT_RPAREN:
857 level--;
858 if (level < 0)
859 goto finished;
860 goto between_desc;
861
862 default:
863 /* Assume that we have another format item. */
864 saved_token = t;
865 break;
866 }
867
868 goto format_item;
869
870 extension_optional_comma:
871 /* As a GNU extension, permit a missing comma after a string literal. */
872 t = format_lex ();
873 if (t == FMT_ERROR)
874 goto fail;
875 switch (t)
876 {
877 case FMT_COMMA:
878 break;
879
880 case FMT_RPAREN:
881 level--;
882 if (level < 0)
883 goto finished;
884 goto between_desc;
885
886 case FMT_COLON:
887 case FMT_SLASH:
888 goto optional_comma;
889
890 case FMT_END:
891 error = unexpected_end;
892 goto syntax;
893
894 default:
895 if (gfc_notify_std (GFC_STD_GNU, "Extension: Missing comma at %C")
896 == FAILURE)
897 return FAILURE;
898 saved_token = t;
899 break;
900 }
901
902 goto format_item;
903
904 syntax:
905 gfc_error ("%s in format string at %C", error);
906 fail:
907 /* TODO: More elaborate measures are needed to show where a problem
908 is within a format string that has been calculated. */
909 rv = FAILURE;
910
911 finished:
912 return rv;
913 }
914
915
916 /* Given an expression node that is a constant string, see if it looks
917 like a format string. */
918
919 static try
920 check_format_string (gfc_expr *e, bool is_input)
921 {
922 mode = MODE_STRING;
923 format_string = e->value.character.string;
924 return check_format (is_input);
925 }
926
927
928 /************ Fortran 95 I/O statement matchers *************/
929
930 /* Match a FORMAT statement. This amounts to actually parsing the
931 format descriptors in order to correctly locate the end of the
932 format string. */
933
934 match
935 gfc_match_format (void)
936 {
937 gfc_expr *e;
938 locus start;
939
940 if (gfc_current_ns->proc_name
941 && gfc_current_ns->proc_name->attr.flavor == FL_MODULE)
942 {
943 gfc_error ("Format statement in module main block at %C");
944 return MATCH_ERROR;
945 }
946
947 if (gfc_statement_label == NULL)
948 {
949 gfc_error ("Missing format label at %C");
950 return MATCH_ERROR;
951 }
952 gfc_gobble_whitespace ();
953
954 mode = MODE_FORMAT;
955 format_length = 0;
956
957 start = gfc_current_locus;
958
959 if (check_format (false) == FAILURE)
960 return MATCH_ERROR;
961
962 if (gfc_match_eos () != MATCH_YES)
963 {
964 gfc_syntax_error (ST_FORMAT);
965 return MATCH_ERROR;
966 }
967
968 /* The label doesn't get created until after the statement is done
969 being matched, so we have to leave the string for later. */
970
971 gfc_current_locus = start; /* Back to the beginning */
972
973 new_st.loc = start;
974 new_st.op = EXEC_NOP;
975
976 e = gfc_get_expr();
977 e->expr_type = EXPR_CONSTANT;
978 e->ts.type = BT_CHARACTER;
979 e->ts.kind = gfc_default_character_kind;
980 e->where = start;
981 e->value.character.string = format_string = gfc_getmem (format_length + 1);
982 e->value.character.length = format_length;
983 gfc_statement_label->format = e;
984
985 mode = MODE_COPY;
986 check_format (false); /* Guaranteed to succeed */
987 gfc_match_eos (); /* Guaranteed to succeed */
988
989 return MATCH_YES;
990 }
991
992
993 /* Match an expression I/O tag of some sort. */
994
995 static match
996 match_etag (const io_tag *tag, gfc_expr **v)
997 {
998 gfc_expr *result;
999 match m;
1000
1001 m = gfc_match (tag->spec, &result);
1002 if (m != MATCH_YES)
1003 return m;
1004
1005 if (*v != NULL)
1006 {
1007 gfc_error ("Duplicate %s specification at %C", tag->name);
1008 gfc_free_expr (result);
1009 return MATCH_ERROR;
1010 }
1011
1012 *v = result;
1013 return MATCH_YES;
1014 }
1015
1016
1017 /* Match a variable I/O tag of some sort. */
1018
1019 static match
1020 match_vtag (const io_tag *tag, gfc_expr **v)
1021 {
1022 gfc_expr *result;
1023 match m;
1024
1025 m = gfc_match (tag->spec, &result);
1026 if (m != MATCH_YES)
1027 return m;
1028
1029 if (*v != NULL)
1030 {
1031 gfc_error ("Duplicate %s specification at %C", tag->name);
1032 gfc_free_expr (result);
1033 return MATCH_ERROR;
1034 }
1035
1036 if (result->symtree->n.sym->attr.intent == INTENT_IN)
1037 {
1038 gfc_error ("Variable tag cannot be INTENT(IN) at %C");
1039 gfc_free_expr (result);
1040 return MATCH_ERROR;
1041 }
1042
1043 if (gfc_pure (NULL) && gfc_impure_variable (result->symtree->n.sym))
1044 {
1045 gfc_error ("Variable tag cannot be assigned in PURE procedure at %C");
1046 gfc_free_expr (result);
1047 return MATCH_ERROR;
1048 }
1049
1050 *v = result;
1051 return MATCH_YES;
1052 }
1053
1054
1055 /* Match I/O tags that cause variables to become redefined. */
1056
1057 static match
1058 match_out_tag(const io_tag *tag, gfc_expr **result)
1059 {
1060 match m;
1061
1062 m = match_vtag(tag, result);
1063 if (m == MATCH_YES)
1064 gfc_check_do_variable((*result)->symtree);
1065
1066 return m;
1067 }
1068
1069
1070 /* Match a label I/O tag. */
1071
1072 static match
1073 match_ltag (const io_tag *tag, gfc_st_label ** label)
1074 {
1075 match m;
1076 gfc_st_label *old;
1077
1078 old = *label;
1079 m = gfc_match (tag->spec, label);
1080 if (m == MATCH_YES && old != 0)
1081 {
1082 gfc_error ("Duplicate %s label specification at %C", tag->name);
1083 return MATCH_ERROR;
1084 }
1085
1086 if (m == MATCH_YES
1087 && gfc_reference_st_label (*label, ST_LABEL_TARGET) == FAILURE)
1088 return MATCH_ERROR;
1089
1090 return m;
1091 }
1092
1093
1094 /* Do expression resolution and type-checking on an expression tag. */
1095
1096 static try
1097 resolve_tag (const io_tag *tag, gfc_expr *e)
1098 {
1099 if (e == NULL)
1100 return SUCCESS;
1101
1102 if (gfc_resolve_expr (e) == FAILURE)
1103 return FAILURE;
1104
1105 if (e->ts.type != tag->type && tag != &tag_format)
1106 {
1107 gfc_error ("%s tag at %L must be of type %s", tag->name,
1108 &e->where, gfc_basic_typename (tag->type));
1109 return FAILURE;
1110 }
1111
1112 if (tag == &tag_format)
1113 {
1114 if (e->expr_type == EXPR_CONSTANT
1115 && (e->ts.type != BT_CHARACTER
1116 || e->ts.kind != gfc_default_character_kind))
1117 {
1118 gfc_error ("Constant expression in FORMAT tag at %L must be "
1119 "of type default CHARACTER", &e->where);
1120 return FAILURE;
1121 }
1122
1123 /* If e's rank is zero and e is not an element of an array, it should be
1124 of integer or character type. The integer variable should be
1125 ASSIGNED. */
1126 if (e->symtree == NULL || e->symtree->n.sym->as == NULL
1127 || e->symtree->n.sym->as->rank == 0)
1128 {
1129 if (e->ts.type != BT_CHARACTER && e->ts.type != BT_INTEGER)
1130 {
1131 gfc_error ("%s tag at %L must be of type %s or %s", tag->name,
1132 &e->where, gfc_basic_typename (BT_CHARACTER),
1133 gfc_basic_typename (BT_INTEGER));
1134 return FAILURE;
1135 }
1136 else if (e->ts.type == BT_INTEGER && e->expr_type == EXPR_VARIABLE)
1137 {
1138 if (gfc_notify_std (GFC_STD_F95_DEL, "Deleted feature: ASSIGNED "
1139 "variable in FORMAT tag at %L", &e->where)
1140 == FAILURE)
1141 return FAILURE;
1142 if (e->symtree->n.sym->attr.assign != 1)
1143 {
1144 gfc_error ("Variable '%s' at %L has not been assigned a "
1145 "format label", e->symtree->n.sym->name,
1146 &e->where);
1147 return FAILURE;
1148 }
1149 }
1150 else if (e->ts.type == BT_INTEGER)
1151 {
1152 gfc_error ("scalar '%s' FORMAT tag at %L is not an ASSIGNED "
1153 "variable", gfc_basic_typename (e->ts.type),
1154 &e->where);
1155 return FAILURE;
1156 }
1157
1158 return SUCCESS;
1159 }
1160 else
1161 {
1162 /* if rank is nonzero, we allow the type to be character under
1163 GFC_STD_GNU and other type under GFC_STD_LEGACY. It may be
1164 assigned an Hollerith constant. */
1165 if (e->ts.type == BT_CHARACTER)
1166 {
1167 if (gfc_notify_std (GFC_STD_GNU, "Extension: Character array "
1168 "in FORMAT tag at %L", &e->where)
1169 == FAILURE)
1170 return FAILURE;
1171 }
1172 else
1173 {
1174 if (gfc_notify_std (GFC_STD_LEGACY, "Extension: Non-character "
1175 "in FORMAT tag at %L", &e->where)
1176 == FAILURE)
1177 return FAILURE;
1178 }
1179 return SUCCESS;
1180 }
1181 }
1182 else
1183 {
1184 if (e->rank != 0)
1185 {
1186 gfc_error ("%s tag at %L must be scalar", tag->name, &e->where);
1187 return FAILURE;
1188 }
1189
1190 if (tag == &tag_iomsg)
1191 {
1192 if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: IOMSG tag at %L",
1193 &e->where) == FAILURE)
1194 return FAILURE;
1195 }
1196
1197 if (tag == &tag_iostat && e->ts.kind != gfc_default_integer_kind)
1198 {
1199 if (gfc_notify_std (GFC_STD_GNU, "Fortran 95 requires default "
1200 "INTEGER in IOSTAT tag at %L", &e->where)
1201 == FAILURE)
1202 return FAILURE;
1203 }
1204
1205 if (tag == &tag_size && e->ts.kind != gfc_default_integer_kind)
1206 {
1207 if (gfc_notify_std (GFC_STD_F2003, "Fortran 95 requires default "
1208 "INTEGER in SIZE tag at %L", &e->where)
1209 == FAILURE)
1210 return FAILURE;
1211 }
1212
1213 if (tag == &tag_convert)
1214 {
1215 if (gfc_notify_std (GFC_STD_GNU, "Extension: CONVERT tag at %L",
1216 &e->where) == FAILURE)
1217 return FAILURE;
1218 }
1219
1220 if (tag == &tag_iolength && e->ts.kind != gfc_default_integer_kind)
1221 {
1222 if (gfc_notify_std (GFC_STD_F2003, "Fortran 95 requires default "
1223 "INTEGER in IOLENGTH tag at %L", &e->where)
1224 == FAILURE)
1225 return FAILURE;
1226 }
1227 }
1228
1229 return SUCCESS;
1230 }
1231
1232
1233 /* Match a single tag of an OPEN statement. */
1234
1235 static match
1236 match_open_element (gfc_open *open)
1237 {
1238 match m;
1239
1240 m = match_etag (&tag_unit, &open->unit);
1241 if (m != MATCH_NO)
1242 return m;
1243 m = match_out_tag (&tag_iomsg, &open->iomsg);
1244 if (m != MATCH_NO)
1245 return m;
1246 m = match_out_tag (&tag_iostat, &open->iostat);
1247 if (m != MATCH_NO)
1248 return m;
1249 m = match_etag (&tag_file, &open->file);
1250 if (m != MATCH_NO)
1251 return m;
1252 m = match_etag (&tag_status, &open->status);
1253 if (m != MATCH_NO)
1254 return m;
1255 m = match_etag (&tag_e_access, &open->access);
1256 if (m != MATCH_NO)
1257 return m;
1258 m = match_etag (&tag_e_form, &open->form);
1259 if (m != MATCH_NO)
1260 return m;
1261 m = match_etag (&tag_e_recl, &open->recl);
1262 if (m != MATCH_NO)
1263 return m;
1264 m = match_etag (&tag_e_blank, &open->blank);
1265 if (m != MATCH_NO)
1266 return m;
1267 m = match_etag (&tag_e_position, &open->position);
1268 if (m != MATCH_NO)
1269 return m;
1270 m = match_etag (&tag_e_action, &open->action);
1271 if (m != MATCH_NO)
1272 return m;
1273 m = match_etag (&tag_e_delim, &open->delim);
1274 if (m != MATCH_NO)
1275 return m;
1276 m = match_etag (&tag_e_pad, &open->pad);
1277 if (m != MATCH_NO)
1278 return m;
1279 m = match_ltag (&tag_err, &open->err);
1280 if (m != MATCH_NO)
1281 return m;
1282 m = match_etag (&tag_convert, &open->convert);
1283 if (m != MATCH_NO)
1284 return m;
1285
1286 return MATCH_NO;
1287 }
1288
1289
1290 /* Free the gfc_open structure and all the expressions it contains. */
1291
1292 void
1293 gfc_free_open (gfc_open *open)
1294 {
1295 if (open == NULL)
1296 return;
1297
1298 gfc_free_expr (open->unit);
1299 gfc_free_expr (open->iomsg);
1300 gfc_free_expr (open->iostat);
1301 gfc_free_expr (open->file);
1302 gfc_free_expr (open->status);
1303 gfc_free_expr (open->access);
1304 gfc_free_expr (open->form);
1305 gfc_free_expr (open->recl);
1306 gfc_free_expr (open->blank);
1307 gfc_free_expr (open->position);
1308 gfc_free_expr (open->action);
1309 gfc_free_expr (open->delim);
1310 gfc_free_expr (open->pad);
1311 gfc_free_expr (open->convert);
1312 gfc_free (open);
1313 }
1314
1315
1316 /* Resolve everything in a gfc_open structure. */
1317
1318 try
1319 gfc_resolve_open (gfc_open *open)
1320 {
1321
1322 RESOLVE_TAG (&tag_unit, open->unit);
1323 RESOLVE_TAG (&tag_iomsg, open->iomsg);
1324 RESOLVE_TAG (&tag_iostat, open->iostat);
1325 RESOLVE_TAG (&tag_file, open->file);
1326 RESOLVE_TAG (&tag_status, open->status);
1327 RESOLVE_TAG (&tag_e_access, open->access);
1328 RESOLVE_TAG (&tag_e_form, open->form);
1329 RESOLVE_TAG (&tag_e_recl, open->recl);
1330 RESOLVE_TAG (&tag_e_blank, open->blank);
1331 RESOLVE_TAG (&tag_e_position, open->position);
1332 RESOLVE_TAG (&tag_e_action, open->action);
1333 RESOLVE_TAG (&tag_e_delim, open->delim);
1334 RESOLVE_TAG (&tag_e_pad, open->pad);
1335 RESOLVE_TAG (&tag_convert, open->convert);
1336
1337 if (gfc_reference_st_label (open->err, ST_LABEL_TARGET) == FAILURE)
1338 return FAILURE;
1339
1340 return SUCCESS;
1341 }
1342
1343
1344 /* Check if a given value for a SPECIFIER is either in the list of values
1345 allowed in F95 or F2003, issuing an error message and returning a zero
1346 value if it is not allowed. */
1347
1348 static int
1349 compare_to_allowed_values (const char *specifier, const char *allowed[],
1350 const char *allowed_f2003[],
1351 const char *allowed_gnu[], char *value,
1352 const char *statement, bool warn)
1353 {
1354 int i;
1355 unsigned int len;
1356
1357 len = strlen (value);
1358 if (len > 0)
1359 {
1360 for (len--; len > 0; len--)
1361 if (value[len] != ' ')
1362 break;
1363 len++;
1364 }
1365
1366 for (i = 0; allowed[i]; i++)
1367 if (len == strlen (allowed[i])
1368 && strncasecmp (value, allowed[i], strlen (allowed[i])) == 0)
1369 return 1;
1370
1371 for (i = 0; allowed_f2003 && allowed_f2003[i]; i++)
1372 if (len == strlen (allowed_f2003[i])
1373 && strncasecmp (value, allowed_f2003[i], strlen (allowed_f2003[i]))
1374 == 0)
1375 {
1376 notification n = gfc_notification_std (GFC_STD_F2003);
1377
1378 if (n == WARNING || (warn && n == ERROR))
1379 {
1380 gfc_warning ("Fortran 2003: %s specifier in %s statement at %C "
1381 "has value '%s'", specifier, statement,
1382 allowed_f2003[i]);
1383 return 1;
1384 }
1385 else
1386 if (n == ERROR)
1387 {
1388 gfc_notify_std (GFC_STD_F2003, "Fortran 2003: %s specifier in "
1389 "%s statement at %C has value '%s'", specifier,
1390 statement, allowed_f2003[i]);
1391 return 0;
1392 }
1393
1394 /* n == SILENT */
1395 return 1;
1396 }
1397
1398 for (i = 0; allowed_gnu && allowed_gnu[i]; i++)
1399 if (len == strlen (allowed_gnu[i])
1400 && strncasecmp (value, allowed_gnu[i], strlen (allowed_gnu[i])) == 0)
1401 {
1402 notification n = gfc_notification_std (GFC_STD_GNU);
1403
1404 if (n == WARNING || (warn && n == ERROR))
1405 {
1406 gfc_warning ("Extension: %s specifier in %s statement at %C "
1407 "has value '%s'", specifier, statement,
1408 allowed_gnu[i]);
1409 return 1;
1410 }
1411 else
1412 if (n == ERROR)
1413 {
1414 gfc_notify_std (GFC_STD_GNU, "Extension: %s specifier in "
1415 "%s statement at %C has value '%s'", specifier,
1416 statement, allowed_gnu[i]);
1417 return 0;
1418 }
1419
1420 /* n == SILENT */
1421 return 1;
1422 }
1423
1424 if (warn)
1425 {
1426 gfc_warning ("%s specifier in %s statement at %C has invalid value '%s'",
1427 specifier, statement, value);
1428 return 1;
1429 }
1430 else
1431 {
1432 gfc_error ("%s specifier in %s statement at %C has invalid value '%s'",
1433 specifier, statement, value);
1434 return 0;
1435 }
1436 }
1437
1438
1439 /* Match an OPEN statement. */
1440
1441 match
1442 gfc_match_open (void)
1443 {
1444 gfc_open *open;
1445 match m;
1446 bool warn;
1447
1448 m = gfc_match_char ('(');
1449 if (m == MATCH_NO)
1450 return m;
1451
1452 open = gfc_getmem (sizeof (gfc_open));
1453
1454 m = match_open_element (open);
1455
1456 if (m == MATCH_ERROR)
1457 goto cleanup;
1458 if (m == MATCH_NO)
1459 {
1460 m = gfc_match_expr (&open->unit);
1461 if (m == MATCH_NO)
1462 goto syntax;
1463 if (m == MATCH_ERROR)
1464 goto cleanup;
1465 }
1466
1467 for (;;)
1468 {
1469 if (gfc_match_char (')') == MATCH_YES)
1470 break;
1471 if (gfc_match_char (',') != MATCH_YES)
1472 goto syntax;
1473
1474 m = match_open_element (open);
1475 if (m == MATCH_ERROR)
1476 goto cleanup;
1477 if (m == MATCH_NO)
1478 goto syntax;
1479 }
1480
1481 if (gfc_match_eos () == MATCH_NO)
1482 goto syntax;
1483
1484 if (gfc_pure (NULL))
1485 {
1486 gfc_error ("OPEN statement not allowed in PURE procedure at %C");
1487 goto cleanup;
1488 }
1489
1490 warn = (open->err || open->iostat) ? true : false;
1491 /* Checks on the ACCESS specifier. */
1492 if (open->access && open->access->expr_type == EXPR_CONSTANT)
1493 {
1494 static const char *access_f95[] = { "SEQUENTIAL", "DIRECT", NULL };
1495 static const char *access_f2003[] = { "STREAM", NULL };
1496 static const char *access_gnu[] = { "APPEND", NULL };
1497
1498 if (!compare_to_allowed_values ("ACCESS", access_f95, access_f2003,
1499 access_gnu,
1500 open->access->value.character.string,
1501 "OPEN", warn))
1502 goto cleanup;
1503 }
1504
1505 /* Checks on the ACTION specifier. */
1506 if (open->action && open->action->expr_type == EXPR_CONSTANT)
1507 {
1508 static const char *action[] = { "READ", "WRITE", "READWRITE", NULL };
1509
1510 if (!compare_to_allowed_values ("ACTION", action, NULL, NULL,
1511 open->action->value.character.string,
1512 "OPEN", warn))
1513 goto cleanup;
1514 }
1515
1516 /* Checks on the ASYNCHRONOUS specifier. */
1517 /* TODO: code is ready, just needs uncommenting when async I/O support
1518 is added ;-)
1519 if (open->asynchronous && open->asynchronous->expr_type == EXPR_CONSTANT)
1520 {
1521 static const char * asynchronous[] = { "YES", "NO", NULL };
1522
1523 if (!compare_to_allowed_values
1524 ("action", asynchronous, NULL, NULL,
1525 open->asynchronous->value.character.string, "OPEN", warn))
1526 goto cleanup;
1527 }*/
1528
1529 /* Checks on the BLANK specifier. */
1530 if (open->blank && open->blank->expr_type == EXPR_CONSTANT)
1531 {
1532 static const char *blank[] = { "ZERO", "NULL", NULL };
1533
1534 if (!compare_to_allowed_values ("BLANK", blank, NULL, NULL,
1535 open->blank->value.character.string,
1536 "OPEN", warn))
1537 goto cleanup;
1538 }
1539
1540 /* Checks on the DECIMAL specifier. */
1541 /* TODO: uncomment this code when DECIMAL support is added
1542 if (open->decimal && open->decimal->expr_type == EXPR_CONSTANT)
1543 {
1544 static const char * decimal[] = { "COMMA", "POINT", NULL };
1545
1546 if (!compare_to_allowed_values ("DECIMAL", decimal, NULL, NULL,
1547 open->decimal->value.character.string,
1548 "OPEN", warn))
1549 goto cleanup;
1550 } */
1551
1552 /* Checks on the DELIM specifier. */
1553 if (open->delim && open->delim->expr_type == EXPR_CONSTANT)
1554 {
1555 static const char *delim[] = { "APOSTROPHE", "QUOTE", "NONE", NULL };
1556
1557 if (!compare_to_allowed_values ("DELIM", delim, NULL, NULL,
1558 open->delim->value.character.string,
1559 "OPEN", warn))
1560 goto cleanup;
1561 }
1562
1563 /* Checks on the ENCODING specifier. */
1564 /* TODO: uncomment this code when ENCODING support is added
1565 if (open->encoding && open->encoding->expr_type == EXPR_CONSTANT)
1566 {
1567 static const char * encoding[] = { "UTF-8", "DEFAULT", NULL };
1568
1569 if (!compare_to_allowed_values ("ENCODING", encoding, NULL, NULL,
1570 open->encoding->value.character.string,
1571 "OPEN", warn))
1572 goto cleanup;
1573 } */
1574
1575 /* Checks on the FORM specifier. */
1576 if (open->form && open->form->expr_type == EXPR_CONSTANT)
1577 {
1578 static const char *form[] = { "FORMATTED", "UNFORMATTED", NULL };
1579
1580 if (!compare_to_allowed_values ("FORM", form, NULL, NULL,
1581 open->form->value.character.string,
1582 "OPEN", warn))
1583 goto cleanup;
1584 }
1585
1586 /* Checks on the PAD specifier. */
1587 if (open->pad && open->pad->expr_type == EXPR_CONSTANT)
1588 {
1589 static const char *pad[] = { "YES", "NO", NULL };
1590
1591 if (!compare_to_allowed_values ("PAD", pad, NULL, NULL,
1592 open->pad->value.character.string,
1593 "OPEN", warn))
1594 goto cleanup;
1595 }
1596
1597 /* Checks on the POSITION specifier. */
1598 if (open->position && open->position->expr_type == EXPR_CONSTANT)
1599 {
1600 static const char *position[] = { "ASIS", "REWIND", "APPEND", NULL };
1601
1602 if (!compare_to_allowed_values ("POSITION", position, NULL, NULL,
1603 open->position->value.character.string,
1604 "OPEN", warn))
1605 goto cleanup;
1606 }
1607
1608 /* Checks on the ROUND specifier. */
1609 /* TODO: uncomment this code when ROUND support is added
1610 if (open->round && open->round->expr_type == EXPR_CONSTANT)
1611 {
1612 static const char * round[] = { "UP", "DOWN", "ZERO", "NEAREST",
1613 "COMPATIBLE", "PROCESSOR_DEFINED", NULL };
1614
1615 if (!compare_to_allowed_values ("ROUND", round, NULL, NULL,
1616 open->round->value.character.string,
1617 "OPEN", warn))
1618 goto cleanup;
1619 } */
1620
1621 /* Checks on the SIGN specifier. */
1622 /* TODO: uncomment this code when SIGN support is added
1623 if (open->sign && open->sign->expr_type == EXPR_CONSTANT)
1624 {
1625 static const char * sign[] = { "PLUS", "SUPPRESS", "PROCESSOR_DEFINED",
1626 NULL };
1627
1628 if (!compare_to_allowed_values ("SIGN", sign, NULL, NULL,
1629 open->sign->value.character.string,
1630 "OPEN", warn))
1631 goto cleanup;
1632 } */
1633
1634 #define warn_or_error(...) \
1635 { \
1636 if (warn) \
1637 gfc_warning (__VA_ARGS__); \
1638 else \
1639 { \
1640 gfc_error (__VA_ARGS__); \
1641 goto cleanup; \
1642 } \
1643 }
1644
1645 /* Checks on the RECL specifier. */
1646 if (open->recl && open->recl->expr_type == EXPR_CONSTANT
1647 && open->recl->ts.type == BT_INTEGER
1648 && mpz_sgn (open->recl->value.integer) != 1)
1649 {
1650 warn_or_error ("RECL in OPEN statement at %C must be positive");
1651 }
1652
1653 /* Checks on the STATUS specifier. */
1654 if (open->status && open->status->expr_type == EXPR_CONSTANT)
1655 {
1656 static const char *status[] = { "OLD", "NEW", "SCRATCH",
1657 "REPLACE", "UNKNOWN", NULL };
1658
1659 if (!compare_to_allowed_values ("STATUS", status, NULL, NULL,
1660 open->status->value.character.string,
1661 "OPEN", warn))
1662 goto cleanup;
1663
1664 /* F2003, 9.4.5: If the STATUS= specifier has the value NEW or REPLACE,
1665 the FILE= specifier shall appear. */
1666 if (open->file == NULL
1667 && (strncasecmp (open->status->value.character.string, "replace", 7)
1668 == 0
1669 || strncasecmp (open->status->value.character.string, "new", 3)
1670 == 0))
1671 {
1672 warn_or_error ("The STATUS specified in OPEN statement at %C is "
1673 "'%s' and no FILE specifier is present",
1674 open->status->value.character.string);
1675 }
1676
1677 /* F2003, 9.4.5: If the STATUS= specifier has the value SCRATCH,
1678 the FILE= specifier shall not appear. */
1679 if (strncasecmp (open->status->value.character.string, "scratch", 7)
1680 == 0 && open->file)
1681 {
1682 warn_or_error ("The STATUS specified in OPEN statement at %C "
1683 "cannot have the value SCRATCH if a FILE specifier "
1684 "is present");
1685 }
1686 }
1687
1688 /* Things that are not allowed for unformatted I/O. */
1689 if (open->form && open->form->expr_type == EXPR_CONSTANT
1690 && (open->delim
1691 /* TODO uncomment this code when F2003 support is finished */
1692 /* || open->decimal || open->encoding || open->round
1693 || open->sign */
1694 || open->pad || open->blank)
1695 && strncasecmp (open->form->value.character.string,
1696 "unformatted", 11) == 0)
1697 {
1698 const char *spec = (open->delim ? "DELIM "
1699 : (open->pad ? "PAD " : open->blank
1700 ? "BLANK " : ""));
1701
1702 warn_or_error ("%s specifier at %C not allowed in OPEN statement for "
1703 "unformatted I/O", spec);
1704 }
1705
1706 if (open->recl && open->access && open->access->expr_type == EXPR_CONSTANT
1707 && strncasecmp (open->access->value.character.string, "stream", 6) == 0)
1708 {
1709 warn_or_error ("RECL specifier not allowed in OPEN statement at %C for "
1710 "stream I/O");
1711 }
1712
1713 if (open->position
1714 && open->access && open->access->expr_type == EXPR_CONSTANT
1715 && !(strncasecmp (open->access->value.character.string,
1716 "sequential", 10) == 0
1717 || strncasecmp (open->access->value.character.string,
1718 "stream", 6) == 0
1719 || strncasecmp (open->access->value.character.string,
1720 "append", 6) == 0))
1721 {
1722 warn_or_error ("POSITION specifier in OPEN statement at %C only allowed "
1723 "for stream or sequential ACCESS");
1724 }
1725
1726 #undef warn_or_error
1727
1728 new_st.op = EXEC_OPEN;
1729 new_st.ext.open = open;
1730 return MATCH_YES;
1731
1732 syntax:
1733 gfc_syntax_error (ST_OPEN);
1734
1735 cleanup:
1736 gfc_free_open (open);
1737 return MATCH_ERROR;
1738 }
1739
1740
1741 /* Free a gfc_close structure an all its expressions. */
1742
1743 void
1744 gfc_free_close (gfc_close *close)
1745 {
1746 if (close == NULL)
1747 return;
1748
1749 gfc_free_expr (close->unit);
1750 gfc_free_expr (close->iomsg);
1751 gfc_free_expr (close->iostat);
1752 gfc_free_expr (close->status);
1753 gfc_free (close);
1754 }
1755
1756
1757 /* Match elements of a CLOSE statement. */
1758
1759 static match
1760 match_close_element (gfc_close *close)
1761 {
1762 match m;
1763
1764 m = match_etag (&tag_unit, &close->unit);
1765 if (m != MATCH_NO)
1766 return m;
1767 m = match_etag (&tag_status, &close->status);
1768 if (m != MATCH_NO)
1769 return m;
1770 m = match_out_tag (&tag_iomsg, &close->iomsg);
1771 if (m != MATCH_NO)
1772 return m;
1773 m = match_out_tag (&tag_iostat, &close->iostat);
1774 if (m != MATCH_NO)
1775 return m;
1776 m = match_ltag (&tag_err, &close->err);
1777 if (m != MATCH_NO)
1778 return m;
1779
1780 return MATCH_NO;
1781 }
1782
1783
1784 /* Match a CLOSE statement. */
1785
1786 match
1787 gfc_match_close (void)
1788 {
1789 gfc_close *close;
1790 match m;
1791 bool warn;
1792
1793 m = gfc_match_char ('(');
1794 if (m == MATCH_NO)
1795 return m;
1796
1797 close = gfc_getmem (sizeof (gfc_close));
1798
1799 m = match_close_element (close);
1800
1801 if (m == MATCH_ERROR)
1802 goto cleanup;
1803 if (m == MATCH_NO)
1804 {
1805 m = gfc_match_expr (&close->unit);
1806 if (m == MATCH_NO)
1807 goto syntax;
1808 if (m == MATCH_ERROR)
1809 goto cleanup;
1810 }
1811
1812 for (;;)
1813 {
1814 if (gfc_match_char (')') == MATCH_YES)
1815 break;
1816 if (gfc_match_char (',') != MATCH_YES)
1817 goto syntax;
1818
1819 m = match_close_element (close);
1820 if (m == MATCH_ERROR)
1821 goto cleanup;
1822 if (m == MATCH_NO)
1823 goto syntax;
1824 }
1825
1826 if (gfc_match_eos () == MATCH_NO)
1827 goto syntax;
1828
1829 if (gfc_pure (NULL))
1830 {
1831 gfc_error ("CLOSE statement not allowed in PURE procedure at %C");
1832 goto cleanup;
1833 }
1834
1835 warn = (close->iostat || close->err) ? true : false;
1836
1837 /* Checks on the STATUS specifier. */
1838 if (close->status && close->status->expr_type == EXPR_CONSTANT)
1839 {
1840 static const char *status[] = { "KEEP", "DELETE", NULL };
1841
1842 if (!compare_to_allowed_values ("STATUS", status, NULL, NULL,
1843 close->status->value.character.string,
1844 "CLOSE", warn))
1845 goto cleanup;
1846 }
1847
1848 new_st.op = EXEC_CLOSE;
1849 new_st.ext.close = close;
1850 return MATCH_YES;
1851
1852 syntax:
1853 gfc_syntax_error (ST_CLOSE);
1854
1855 cleanup:
1856 gfc_free_close (close);
1857 return MATCH_ERROR;
1858 }
1859
1860
1861 /* Resolve everything in a gfc_close structure. */
1862
1863 try
1864 gfc_resolve_close (gfc_close *close)
1865 {
1866 RESOLVE_TAG (&tag_unit, close->unit);
1867 RESOLVE_TAG (&tag_iomsg, close->iomsg);
1868 RESOLVE_TAG (&tag_iostat, close->iostat);
1869 RESOLVE_TAG (&tag_status, close->status);
1870
1871 if (gfc_reference_st_label (close->err, ST_LABEL_TARGET) == FAILURE)
1872 return FAILURE;
1873
1874 return SUCCESS;
1875 }
1876
1877
1878 /* Free a gfc_filepos structure. */
1879
1880 void
1881 gfc_free_filepos (gfc_filepos *fp)
1882 {
1883 gfc_free_expr (fp->unit);
1884 gfc_free_expr (fp->iomsg);
1885 gfc_free_expr (fp->iostat);
1886 gfc_free (fp);
1887 }
1888
1889
1890 /* Match elements of a REWIND, BACKSPACE, ENDFILE, or FLUSH statement. */
1891
1892 static match
1893 match_file_element (gfc_filepos *fp)
1894 {
1895 match m;
1896
1897 m = match_etag (&tag_unit, &fp->unit);
1898 if (m != MATCH_NO)
1899 return m;
1900 m = match_out_tag (&tag_iomsg, &fp->iomsg);
1901 if (m != MATCH_NO)
1902 return m;
1903 m = match_out_tag (&tag_iostat, &fp->iostat);
1904 if (m != MATCH_NO)
1905 return m;
1906 m = match_ltag (&tag_err, &fp->err);
1907 if (m != MATCH_NO)
1908 return m;
1909
1910 return MATCH_NO;
1911 }
1912
1913
1914 /* Match the second half of the file-positioning statements, REWIND,
1915 BACKSPACE, ENDFILE, or the FLUSH statement. */
1916
1917 static match
1918 match_filepos (gfc_statement st, gfc_exec_op op)
1919 {
1920 gfc_filepos *fp;
1921 match m;
1922
1923 fp = gfc_getmem (sizeof (gfc_filepos));
1924
1925 if (gfc_match_char ('(') == MATCH_NO)
1926 {
1927 m = gfc_match_expr (&fp->unit);
1928 if (m == MATCH_ERROR)
1929 goto cleanup;
1930 if (m == MATCH_NO)
1931 goto syntax;
1932
1933 goto done;
1934 }
1935
1936 m = match_file_element (fp);
1937 if (m == MATCH_ERROR)
1938 goto done;
1939 if (m == MATCH_NO)
1940 {
1941 m = gfc_match_expr (&fp->unit);
1942 if (m == MATCH_ERROR)
1943 goto done;
1944 if (m == MATCH_NO)
1945 goto syntax;
1946 }
1947
1948 for (;;)
1949 {
1950 if (gfc_match_char (')') == MATCH_YES)
1951 break;
1952 if (gfc_match_char (',') != MATCH_YES)
1953 goto syntax;
1954
1955 m = match_file_element (fp);
1956 if (m == MATCH_ERROR)
1957 goto cleanup;
1958 if (m == MATCH_NO)
1959 goto syntax;
1960 }
1961
1962 done:
1963 if (gfc_match_eos () != MATCH_YES)
1964 goto syntax;
1965
1966 if (gfc_pure (NULL))
1967 {
1968 gfc_error ("%s statement not allowed in PURE procedure at %C",
1969 gfc_ascii_statement (st));
1970
1971 goto cleanup;
1972 }
1973
1974 new_st.op = op;
1975 new_st.ext.filepos = fp;
1976 return MATCH_YES;
1977
1978 syntax:
1979 gfc_syntax_error (st);
1980
1981 cleanup:
1982 gfc_free_filepos (fp);
1983 return MATCH_ERROR;
1984 }
1985
1986
1987 try
1988 gfc_resolve_filepos (gfc_filepos *fp)
1989 {
1990 RESOLVE_TAG (&tag_unit, fp->unit);
1991 RESOLVE_TAG (&tag_iostat, fp->iostat);
1992 RESOLVE_TAG (&tag_iomsg, fp->iomsg);
1993 if (gfc_reference_st_label (fp->err, ST_LABEL_TARGET) == FAILURE)
1994 return FAILURE;
1995
1996 return SUCCESS;
1997 }
1998
1999
2000 /* Match the file positioning statements: ENDFILE, BACKSPACE, REWIND,
2001 and the FLUSH statement. */
2002
2003 match
2004 gfc_match_endfile (void)
2005 {
2006 return match_filepos (ST_END_FILE, EXEC_ENDFILE);
2007 }
2008
2009 match
2010 gfc_match_backspace (void)
2011 {
2012 return match_filepos (ST_BACKSPACE, EXEC_BACKSPACE);
2013 }
2014
2015 match
2016 gfc_match_rewind (void)
2017 {
2018 return match_filepos (ST_REWIND, EXEC_REWIND);
2019 }
2020
2021 match
2022 gfc_match_flush (void)
2023 {
2024 if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: FLUSH statement at %C")
2025 == FAILURE)
2026 return MATCH_ERROR;
2027
2028 return match_filepos (ST_FLUSH, EXEC_FLUSH);
2029 }
2030
2031 /******************** Data Transfer Statements *********************/
2032
2033 typedef enum
2034 { M_READ, M_WRITE, M_PRINT, M_INQUIRE }
2035 io_kind;
2036
2037
2038 /* Return a default unit number. */
2039
2040 static gfc_expr *
2041 default_unit (io_kind k)
2042 {
2043 int unit;
2044
2045 if (k == M_READ)
2046 unit = 5;
2047 else
2048 unit = 6;
2049
2050 return gfc_int_expr (unit);
2051 }
2052
2053
2054 /* Match a unit specification for a data transfer statement. */
2055
2056 static match
2057 match_dt_unit (io_kind k, gfc_dt *dt)
2058 {
2059 gfc_expr *e;
2060
2061 if (gfc_match_char ('*') == MATCH_YES)
2062 {
2063 if (dt->io_unit != NULL)
2064 goto conflict;
2065
2066 dt->io_unit = default_unit (k);
2067 return MATCH_YES;
2068 }
2069
2070 if (gfc_match_expr (&e) == MATCH_YES)
2071 {
2072 if (dt->io_unit != NULL)
2073 {
2074 gfc_free_expr (e);
2075 goto conflict;
2076 }
2077
2078 dt->io_unit = e;
2079 return MATCH_YES;
2080 }
2081
2082 return MATCH_NO;
2083
2084 conflict:
2085 gfc_error ("Duplicate UNIT specification at %C");
2086 return MATCH_ERROR;
2087 }
2088
2089
2090 /* Match a format specification. */
2091
2092 static match
2093 match_dt_format (gfc_dt *dt)
2094 {
2095 locus where;
2096 gfc_expr *e;
2097 gfc_st_label *label;
2098
2099 where = gfc_current_locus;
2100
2101 if (gfc_match_char ('*') == MATCH_YES)
2102 {
2103 if (dt->format_expr != NULL || dt->format_label != NULL)
2104 goto conflict;
2105
2106 dt->format_label = &format_asterisk;
2107 return MATCH_YES;
2108 }
2109
2110 if (gfc_match_st_label (&label) == MATCH_YES)
2111 {
2112 if (dt->format_expr != NULL || dt->format_label != NULL)
2113 {
2114 gfc_free_st_label (label);
2115 goto conflict;
2116 }
2117
2118 if (gfc_reference_st_label (label, ST_LABEL_FORMAT) == FAILURE)
2119 return MATCH_ERROR;
2120
2121 dt->format_label = label;
2122 return MATCH_YES;
2123 }
2124
2125 if (gfc_match_expr (&e) == MATCH_YES)
2126 {
2127 if (dt->format_expr != NULL || dt->format_label != NULL)
2128 {
2129 gfc_free_expr (e);
2130 goto conflict;
2131 }
2132 dt->format_expr = e;
2133 return MATCH_YES;
2134 }
2135
2136 gfc_current_locus = where; /* The only case where we have to restore */
2137
2138 return MATCH_NO;
2139
2140 conflict:
2141 gfc_error ("Duplicate format specification at %C");
2142 return MATCH_ERROR;
2143 }
2144
2145
2146 /* Traverse a namelist that is part of a READ statement to make sure
2147 that none of the variables in the namelist are INTENT(IN). Returns
2148 nonzero if we find such a variable. */
2149
2150 static int
2151 check_namelist (gfc_symbol *sym)
2152 {
2153 gfc_namelist *p;
2154
2155 for (p = sym->namelist; p; p = p->next)
2156 if (p->sym->attr.intent == INTENT_IN)
2157 {
2158 gfc_error ("Symbol '%s' in namelist '%s' is INTENT(IN) at %C",
2159 p->sym->name, sym->name);
2160 return 1;
2161 }
2162
2163 return 0;
2164 }
2165
2166
2167 /* Match a single data transfer element. */
2168
2169 static match
2170 match_dt_element (io_kind k, gfc_dt *dt)
2171 {
2172 char name[GFC_MAX_SYMBOL_LEN + 1];
2173 gfc_symbol *sym;
2174 match m;
2175
2176 if (gfc_match (" unit =") == MATCH_YES)
2177 {
2178 m = match_dt_unit (k, dt);
2179 if (m != MATCH_NO)
2180 return m;
2181 }
2182
2183 if (gfc_match (" fmt =") == MATCH_YES)
2184 {
2185 m = match_dt_format (dt);
2186 if (m != MATCH_NO)
2187 return m;
2188 }
2189
2190 if (gfc_match (" nml = %n", name) == MATCH_YES)
2191 {
2192 if (dt->namelist != NULL)
2193 {
2194 gfc_error ("Duplicate NML specification at %C");
2195 return MATCH_ERROR;
2196 }
2197
2198 if (gfc_find_symbol (name, NULL, 1, &sym))
2199 return MATCH_ERROR;
2200
2201 if (sym == NULL || sym->attr.flavor != FL_NAMELIST)
2202 {
2203 gfc_error ("Symbol '%s' at %C must be a NAMELIST group name",
2204 sym != NULL ? sym->name : name);
2205 return MATCH_ERROR;
2206 }
2207
2208 dt->namelist = sym;
2209 if (k == M_READ && check_namelist (sym))
2210 return MATCH_ERROR;
2211
2212 return MATCH_YES;
2213 }
2214
2215 m = match_etag (&tag_rec, &dt->rec);
2216 if (m != MATCH_NO)
2217 return m;
2218 m = match_etag (&tag_spos, &dt->rec);
2219 if (m != MATCH_NO)
2220 return m;
2221 m = match_out_tag (&tag_iomsg, &dt->iomsg);
2222 if (m != MATCH_NO)
2223 return m;
2224 m = match_out_tag (&tag_iostat, &dt->iostat);
2225 if (m != MATCH_NO)
2226 return m;
2227 m = match_ltag (&tag_err, &dt->err);
2228 if (m == MATCH_YES)
2229 dt->err_where = gfc_current_locus;
2230 if (m != MATCH_NO)
2231 return m;
2232 m = match_etag (&tag_advance, &dt->advance);
2233 if (m != MATCH_NO)
2234 return m;
2235 m = match_out_tag (&tag_size, &dt->size);
2236 if (m != MATCH_NO)
2237 return m;
2238
2239 m = match_ltag (&tag_end, &dt->end);
2240 if (m == MATCH_YES)
2241 {
2242 if (k == M_WRITE)
2243 {
2244 gfc_error ("END tag at %C not allowed in output statement");
2245 return MATCH_ERROR;
2246 }
2247 dt->end_where = gfc_current_locus;
2248 }
2249 if (m != MATCH_NO)
2250 return m;
2251
2252 m = match_ltag (&tag_eor, &dt->eor);
2253 if (m == MATCH_YES)
2254 dt->eor_where = gfc_current_locus;
2255 if (m != MATCH_NO)
2256 return m;
2257
2258 return MATCH_NO;
2259 }
2260
2261
2262 /* Free a data transfer structure and everything below it. */
2263
2264 void
2265 gfc_free_dt (gfc_dt *dt)
2266 {
2267 if (dt == NULL)
2268 return;
2269
2270 gfc_free_expr (dt->io_unit);
2271 gfc_free_expr (dt->format_expr);
2272 gfc_free_expr (dt->rec);
2273 gfc_free_expr (dt->advance);
2274 gfc_free_expr (dt->iomsg);
2275 gfc_free_expr (dt->iostat);
2276 gfc_free_expr (dt->size);
2277 gfc_free (dt);
2278 }
2279
2280
2281 /* Resolve everything in a gfc_dt structure. */
2282
2283 try
2284 gfc_resolve_dt (gfc_dt *dt)
2285 {
2286 gfc_expr *e;
2287
2288 RESOLVE_TAG (&tag_format, dt->format_expr);
2289 RESOLVE_TAG (&tag_rec, dt->rec);
2290 RESOLVE_TAG (&tag_spos, dt->rec);
2291 RESOLVE_TAG (&tag_advance, dt->advance);
2292 RESOLVE_TAG (&tag_iomsg, dt->iomsg);
2293 RESOLVE_TAG (&tag_iostat, dt->iostat);
2294 RESOLVE_TAG (&tag_size, dt->size);
2295
2296 e = dt->io_unit;
2297 if (gfc_resolve_expr (e) == SUCCESS
2298 && (e->ts.type != BT_INTEGER
2299 && (e->ts.type != BT_CHARACTER || e->expr_type != EXPR_VARIABLE)))
2300 {
2301 gfc_error ("UNIT specification at %L must be an INTEGER expression "
2302 "or a CHARACTER variable", &e->where);
2303 return FAILURE;
2304 }
2305
2306 if (e->ts.type == BT_CHARACTER)
2307 {
2308 if (gfc_has_vector_index (e))
2309 {
2310 gfc_error ("Internal unit with vector subscript at %L", &e->where);
2311 return FAILURE;
2312 }
2313 }
2314
2315 if (e->rank && e->ts.type != BT_CHARACTER)
2316 {
2317 gfc_error ("External IO UNIT cannot be an array at %L", &e->where);
2318 return FAILURE;
2319 }
2320
2321 if (dt->err)
2322 {
2323 if (gfc_reference_st_label (dt->err, ST_LABEL_TARGET) == FAILURE)
2324 return FAILURE;
2325 if (dt->err->defined == ST_LABEL_UNKNOWN)
2326 {
2327 gfc_error ("ERR tag label %d at %L not defined",
2328 dt->err->value, &dt->err_where);
2329 return FAILURE;
2330 }
2331 }
2332
2333 if (dt->end)
2334 {
2335 if (gfc_reference_st_label (dt->end, ST_LABEL_TARGET) == FAILURE)
2336 return FAILURE;
2337 if (dt->end->defined == ST_LABEL_UNKNOWN)
2338 {
2339 gfc_error ("END tag label %d at %L not defined",
2340 dt->end->value, &dt->end_where);
2341 return FAILURE;
2342 }
2343 }
2344
2345 if (dt->eor)
2346 {
2347 if (gfc_reference_st_label (dt->eor, ST_LABEL_TARGET) == FAILURE)
2348 return FAILURE;
2349 if (dt->eor->defined == ST_LABEL_UNKNOWN)
2350 {
2351 gfc_error ("EOR tag label %d at %L not defined",
2352 dt->eor->value, &dt->eor_where);
2353 return FAILURE;
2354 }
2355 }
2356
2357 /* Check the format label actually exists. */
2358 if (dt->format_label && dt->format_label != &format_asterisk
2359 && dt->format_label->defined == ST_LABEL_UNKNOWN)
2360 {
2361 gfc_error ("FORMAT label %d at %L not defined", dt->format_label->value,
2362 &dt->format_label->where);
2363 return FAILURE;
2364 }
2365 return SUCCESS;
2366 }
2367
2368
2369 /* Given an io_kind, return its name. */
2370
2371 static const char *
2372 io_kind_name (io_kind k)
2373 {
2374 const char *name;
2375
2376 switch (k)
2377 {
2378 case M_READ:
2379 name = "READ";
2380 break;
2381 case M_WRITE:
2382 name = "WRITE";
2383 break;
2384 case M_PRINT:
2385 name = "PRINT";
2386 break;
2387 case M_INQUIRE:
2388 name = "INQUIRE";
2389 break;
2390 default:
2391 gfc_internal_error ("io_kind_name(): bad I/O-kind");
2392 }
2393
2394 return name;
2395 }
2396
2397
2398 /* Match an IO iteration statement of the form:
2399
2400 ( [<IO element> ,] <IO element>, I = <expr>, <expr> [, <expr> ] )
2401
2402 which is equivalent to a single IO element. This function is
2403 mutually recursive with match_io_element(). */
2404
2405 static match match_io_element (io_kind, gfc_code **);
2406
2407 static match
2408 match_io_iterator (io_kind k, gfc_code **result)
2409 {
2410 gfc_code *head, *tail, *new;
2411 gfc_iterator *iter;
2412 locus old_loc;
2413 match m;
2414 int n;
2415
2416 iter = NULL;
2417 head = NULL;
2418 old_loc = gfc_current_locus;
2419
2420 if (gfc_match_char ('(') != MATCH_YES)
2421 return MATCH_NO;
2422
2423 m = match_io_element (k, &head);
2424 tail = head;
2425
2426 if (m != MATCH_YES || gfc_match_char (',') != MATCH_YES)
2427 {
2428 m = MATCH_NO;
2429 goto cleanup;
2430 }
2431
2432 /* Can't be anything but an IO iterator. Build a list. */
2433 iter = gfc_get_iterator ();
2434
2435 for (n = 1;; n++)
2436 {
2437 m = gfc_match_iterator (iter, 0);
2438 if (m == MATCH_ERROR)
2439 goto cleanup;
2440 if (m == MATCH_YES)
2441 {
2442 gfc_check_do_variable (iter->var->symtree);
2443 break;
2444 }
2445
2446 m = match_io_element (k, &new);
2447 if (m == MATCH_ERROR)
2448 goto cleanup;
2449 if (m == MATCH_NO)
2450 {
2451 if (n > 2)
2452 goto syntax;
2453 goto cleanup;
2454 }
2455
2456 tail = gfc_append_code (tail, new);
2457
2458 if (gfc_match_char (',') != MATCH_YES)
2459 {
2460 if (n > 2)
2461 goto syntax;
2462 m = MATCH_NO;
2463 goto cleanup;
2464 }
2465 }
2466
2467 if (gfc_match_char (')') != MATCH_YES)
2468 goto syntax;
2469
2470 new = gfc_get_code ();
2471 new->op = EXEC_DO;
2472 new->ext.iterator = iter;
2473
2474 new->block = gfc_get_code ();
2475 new->block->op = EXEC_DO;
2476 new->block->next = head;
2477
2478 *result = new;
2479 return MATCH_YES;
2480
2481 syntax:
2482 gfc_error ("Syntax error in I/O iterator at %C");
2483 m = MATCH_ERROR;
2484
2485 cleanup:
2486 gfc_free_iterator (iter, 1);
2487 gfc_free_statements (head);
2488 gfc_current_locus = old_loc;
2489 return m;
2490 }
2491
2492
2493 /* Match a single element of an IO list, which is either a single
2494 expression or an IO Iterator. */
2495
2496 static match
2497 match_io_element (io_kind k, gfc_code **cpp)
2498 {
2499 gfc_expr *expr;
2500 gfc_code *cp;
2501 match m;
2502
2503 expr = NULL;
2504
2505 m = match_io_iterator (k, cpp);
2506 if (m == MATCH_YES)
2507 return MATCH_YES;
2508
2509 if (k == M_READ)
2510 {
2511 m = gfc_match_variable (&expr, 0);
2512 if (m == MATCH_NO)
2513 gfc_error ("Expected variable in READ statement at %C");
2514 }
2515 else
2516 {
2517 m = gfc_match_expr (&expr);
2518 if (m == MATCH_NO)
2519 gfc_error ("Expected expression in %s statement at %C",
2520 io_kind_name (k));
2521 }
2522
2523 if (m == MATCH_YES)
2524 switch (k)
2525 {
2526 case M_READ:
2527 if (expr->symtree->n.sym->attr.intent == INTENT_IN)
2528 {
2529 gfc_error ("Variable '%s' in input list at %C cannot be "
2530 "INTENT(IN)", expr->symtree->n.sym->name);
2531 m = MATCH_ERROR;
2532 }
2533
2534 if (gfc_pure (NULL)
2535 && gfc_impure_variable (expr->symtree->n.sym)
2536 && current_dt->io_unit->ts.type == BT_CHARACTER)
2537 {
2538 gfc_error ("Cannot read to variable '%s' in PURE procedure at %C",
2539 expr->symtree->n.sym->name);
2540 m = MATCH_ERROR;
2541 }
2542
2543 if (gfc_check_do_variable (expr->symtree))
2544 m = MATCH_ERROR;
2545
2546 break;
2547
2548 case M_WRITE:
2549 if (current_dt->io_unit->ts.type == BT_CHARACTER
2550 && gfc_pure (NULL)
2551 && current_dt->io_unit->expr_type == EXPR_VARIABLE
2552 && gfc_impure_variable (current_dt->io_unit->symtree->n.sym))
2553 {
2554 gfc_error ("Cannot write to internal file unit '%s' at %C "
2555 "inside a PURE procedure",
2556 current_dt->io_unit->symtree->n.sym->name);
2557 m = MATCH_ERROR;
2558 }
2559
2560 break;
2561
2562 default:
2563 break;
2564 }
2565
2566 if (m != MATCH_YES)
2567 {
2568 gfc_free_expr (expr);
2569 return MATCH_ERROR;
2570 }
2571
2572 cp = gfc_get_code ();
2573 cp->op = EXEC_TRANSFER;
2574 cp->expr = expr;
2575
2576 *cpp = cp;
2577 return MATCH_YES;
2578 }
2579
2580
2581 /* Match an I/O list, building gfc_code structures as we go. */
2582
2583 static match
2584 match_io_list (io_kind k, gfc_code **head_p)
2585 {
2586 gfc_code *head, *tail, *new;
2587 match m;
2588
2589 *head_p = head = tail = NULL;
2590 if (gfc_match_eos () == MATCH_YES)
2591 return MATCH_YES;
2592
2593 for (;;)
2594 {
2595 m = match_io_element (k, &new);
2596 if (m == MATCH_ERROR)
2597 goto cleanup;
2598 if (m == MATCH_NO)
2599 goto syntax;
2600
2601 tail = gfc_append_code (tail, new);
2602 if (head == NULL)
2603 head = new;
2604
2605 if (gfc_match_eos () == MATCH_YES)
2606 break;
2607 if (gfc_match_char (',') != MATCH_YES)
2608 goto syntax;
2609 }
2610
2611 *head_p = head;
2612 return MATCH_YES;
2613
2614 syntax:
2615 gfc_error ("Syntax error in %s statement at %C", io_kind_name (k));
2616
2617 cleanup:
2618 gfc_free_statements (head);
2619 return MATCH_ERROR;
2620 }
2621
2622
2623 /* Attach the data transfer end node. */
2624
2625 static void
2626 terminate_io (gfc_code *io_code)
2627 {
2628 gfc_code *c;
2629
2630 if (io_code == NULL)
2631 io_code = new_st.block;
2632
2633 c = gfc_get_code ();
2634 c->op = EXEC_DT_END;
2635
2636 /* Point to structure that is already there */
2637 c->ext.dt = new_st.ext.dt;
2638 gfc_append_code (io_code, c);
2639 }
2640
2641
2642 /* Check the constraints for a data transfer statement. The majority of the
2643 constraints appearing in 9.4 of the standard appear here. Some are handled
2644 in resolve_tag and others in gfc_resolve_dt. */
2645
2646 static match
2647 check_io_constraints (io_kind k, gfc_dt *dt, gfc_code *io_code,
2648 locus *spec_end)
2649 {
2650 #define io_constraint(condition,msg,arg)\
2651 if (condition) \
2652 {\
2653 gfc_error(msg,arg);\
2654 m = MATCH_ERROR;\
2655 }
2656
2657 match m;
2658 gfc_expr *expr;
2659 gfc_symbol *sym = NULL;
2660
2661 m = MATCH_YES;
2662
2663 expr = dt->io_unit;
2664 if (expr && expr->expr_type == EXPR_VARIABLE
2665 && expr->ts.type == BT_CHARACTER)
2666 {
2667 sym = expr->symtree->n.sym;
2668
2669 io_constraint (k == M_WRITE && sym->attr.intent == INTENT_IN,
2670 "Internal file at %L must not be INTENT(IN)",
2671 &expr->where);
2672
2673 io_constraint (gfc_has_vector_index (dt->io_unit),
2674 "Internal file incompatible with vector subscript at %L",
2675 &expr->where);
2676
2677 io_constraint (dt->rec != NULL,
2678 "REC tag at %L is incompatible with internal file",
2679 &dt->rec->where);
2680
2681 if (dt->namelist != NULL)
2682 {
2683 if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: Internal file "
2684 "at %L with namelist", &expr->where)
2685 == FAILURE)
2686 m = MATCH_ERROR;
2687 }
2688
2689 io_constraint (dt->advance != NULL,
2690 "ADVANCE tag at %L is incompatible with internal file",
2691 &dt->advance->where);
2692 }
2693
2694 if (expr && expr->ts.type != BT_CHARACTER)
2695 {
2696
2697 io_constraint (gfc_pure (NULL) && (k == M_READ || k == M_WRITE),
2698 "IO UNIT in %s statement at %C must be "
2699 "an internal file in a PURE procedure",
2700 io_kind_name (k));
2701 }
2702
2703
2704 if (k != M_READ)
2705 {
2706 io_constraint (dt->end, "END tag not allowed with output at %L",
2707 &dt->end_where);
2708
2709 io_constraint (dt->eor, "EOR tag not allowed with output at %L",
2710 &dt->eor_where);
2711
2712 io_constraint (k != M_READ && dt->size,
2713 "SIZE=specifier not allowed with output at %L",
2714 &dt->size->where);
2715 }
2716 else
2717 {
2718 io_constraint (dt->size && dt->advance == NULL,
2719 "SIZE tag at %L requires an ADVANCE tag",
2720 &dt->size->where);
2721
2722 io_constraint (dt->eor && dt->advance == NULL,
2723 "EOR tag at %L requires an ADVANCE tag",
2724 &dt->eor_where);
2725 }
2726
2727
2728
2729 if (dt->namelist)
2730 {
2731 io_constraint (io_code && dt->namelist,
2732 "NAMELIST cannot be followed by IO-list at %L",
2733 &io_code->loc);
2734
2735 io_constraint (dt->format_expr,
2736 "IO spec-list cannot contain both NAMELIST group name "
2737 "and format specification at %L.",
2738 &dt->format_expr->where);
2739
2740 io_constraint (dt->format_label,
2741 "IO spec-list cannot contain both NAMELIST group name "
2742 "and format label at %L", spec_end);
2743
2744 io_constraint (dt->rec,
2745 "NAMELIST IO is not allowed with a REC=specifier "
2746 "at %L.", &dt->rec->where);
2747
2748 io_constraint (dt->advance,
2749 "NAMELIST IO is not allowed with a ADVANCE=specifier "
2750 "at %L.", &dt->advance->where);
2751 }
2752
2753 if (dt->rec)
2754 {
2755 io_constraint (dt->end,
2756 "An END tag is not allowed with a "
2757 "REC=specifier at %L.", &dt->end_where);
2758
2759
2760 io_constraint (dt->format_label == &format_asterisk,
2761 "FMT=* is not allowed with a REC=specifier "
2762 "at %L.", spec_end);
2763 }
2764
2765 if (dt->advance)
2766 {
2767 int not_yes, not_no;
2768 expr = dt->advance;
2769
2770 io_constraint (dt->format_label == &format_asterisk,
2771 "List directed format(*) is not allowed with a "
2772 "ADVANCE=specifier at %L.", &expr->where);
2773
2774 io_constraint (dt->format_expr == NULL && dt->format_label == NULL
2775 && dt->namelist == NULL,
2776 "the ADVANCE=specifier at %L must appear with an "
2777 "explicit format expression", &expr->where);
2778
2779 if (expr->expr_type == EXPR_CONSTANT && expr->ts.type == BT_CHARACTER)
2780 {
2781 const char * advance = expr->value.character.string;
2782 not_no = strcasecmp (advance, "no") != 0;
2783 not_yes = strcasecmp (advance, "yes") != 0;
2784 }
2785 else
2786 {
2787 not_no = 0;
2788 not_yes = 0;
2789 }
2790
2791 io_constraint (not_no && not_yes,
2792 "ADVANCE=specifier at %L must have value = "
2793 "YES or NO.", &expr->where);
2794
2795 io_constraint (dt->size && not_no && k == M_READ,
2796 "SIZE tag at %L requires an ADVANCE = 'NO'",
2797 &dt->size->where);
2798
2799 io_constraint (dt->eor && not_no && k == M_READ,
2800 "EOR tag at %L requires an ADVANCE = 'NO'",
2801 &dt->eor_where);
2802 }
2803
2804 expr = dt->format_expr;
2805 if (expr != NULL && expr->expr_type == EXPR_CONSTANT
2806 && check_format_string (expr, k == M_READ) == FAILURE)
2807 return MATCH_ERROR;
2808
2809 return m;
2810 }
2811 #undef io_constraint
2812
2813
2814 /* Match a READ, WRITE or PRINT statement. */
2815
2816 static match
2817 match_io (io_kind k)
2818 {
2819 char name[GFC_MAX_SYMBOL_LEN + 1];
2820 gfc_code *io_code;
2821 gfc_symbol *sym;
2822 int comma_flag, c;
2823 locus where;
2824 locus spec_end;
2825 gfc_dt *dt;
2826 match m;
2827
2828 where = gfc_current_locus;
2829 comma_flag = 0;
2830 current_dt = dt = gfc_getmem (sizeof (gfc_dt));
2831 m = gfc_match_char ('(');
2832 if (m == MATCH_NO)
2833 {
2834 where = gfc_current_locus;
2835 if (k == M_WRITE)
2836 goto syntax;
2837 else if (k == M_PRINT)
2838 {
2839 /* Treat the non-standard case of PRINT namelist. */
2840 if ((gfc_current_form == FORM_FIXED || gfc_peek_char () == ' ')
2841 && gfc_match_name (name) == MATCH_YES)
2842 {
2843 gfc_find_symbol (name, NULL, 1, &sym);
2844 if (sym && sym->attr.flavor == FL_NAMELIST)
2845 {
2846 if (gfc_notify_std (GFC_STD_GNU, "PRINT namelist at "
2847 "%C is an extension") == FAILURE)
2848 {
2849 m = MATCH_ERROR;
2850 goto cleanup;
2851 }
2852
2853 dt->io_unit = default_unit (k);
2854 dt->namelist = sym;
2855 goto get_io_list;
2856 }
2857 else
2858 gfc_current_locus = where;
2859 }
2860 }
2861
2862 if (gfc_current_form == FORM_FREE)
2863 {
2864 c = gfc_peek_char();
2865 if (c != ' ' && c != '*' && c != '\'' && c != '"')
2866 {
2867 m = MATCH_NO;
2868 goto cleanup;
2869 }
2870 }
2871
2872 m = match_dt_format (dt);
2873 if (m == MATCH_ERROR)
2874 goto cleanup;
2875 if (m == MATCH_NO)
2876 goto syntax;
2877
2878 comma_flag = 1;
2879 dt->io_unit = default_unit (k);
2880 goto get_io_list;
2881 }
2882 else
2883 {
2884 /* Before issuing an error for a malformed 'print (1,*)' type of
2885 error, check for a default-char-expr of the form ('(I0)'). */
2886 if (k == M_PRINT && m == MATCH_YES)
2887 {
2888 /* Reset current locus to get the initial '(' in an expression. */
2889 gfc_current_locus = where;
2890 dt->format_expr = NULL;
2891 m = match_dt_format (dt);
2892
2893 if (m == MATCH_ERROR)
2894 goto cleanup;
2895 if (m == MATCH_NO || dt->format_expr == NULL)
2896 goto syntax;
2897
2898 comma_flag = 1;
2899 dt->io_unit = default_unit (k);
2900 goto get_io_list;
2901 }
2902 }
2903
2904 /* Match a control list */
2905 if (match_dt_element (k, dt) == MATCH_YES)
2906 goto next;
2907 if (match_dt_unit (k, dt) != MATCH_YES)
2908 goto loop;
2909
2910 if (gfc_match_char (')') == MATCH_YES)
2911 goto get_io_list;
2912 if (gfc_match_char (',') != MATCH_YES)
2913 goto syntax;
2914
2915 m = match_dt_element (k, dt);
2916 if (m == MATCH_YES)
2917 goto next;
2918 if (m == MATCH_ERROR)
2919 goto cleanup;
2920
2921 m = match_dt_format (dt);
2922 if (m == MATCH_YES)
2923 goto next;
2924 if (m == MATCH_ERROR)
2925 goto cleanup;
2926
2927 where = gfc_current_locus;
2928
2929 m = gfc_match_name (name);
2930 if (m == MATCH_YES)
2931 {
2932 gfc_find_symbol (name, NULL, 1, &sym);
2933 if (sym && sym->attr.flavor == FL_NAMELIST)
2934 {
2935 dt->namelist = sym;
2936 if (k == M_READ && check_namelist (sym))
2937 {
2938 m = MATCH_ERROR;
2939 goto cleanup;
2940 }
2941 goto next;
2942 }
2943 }
2944
2945 gfc_current_locus = where;
2946
2947 goto loop; /* No matches, try regular elements */
2948
2949 next:
2950 if (gfc_match_char (')') == MATCH_YES)
2951 goto get_io_list;
2952 if (gfc_match_char (',') != MATCH_YES)
2953 goto syntax;
2954
2955 loop:
2956 for (;;)
2957 {
2958 m = match_dt_element (k, dt);
2959 if (m == MATCH_NO)
2960 goto syntax;
2961 if (m == MATCH_ERROR)
2962 goto cleanup;
2963
2964 if (gfc_match_char (')') == MATCH_YES)
2965 break;
2966 if (gfc_match_char (',') != MATCH_YES)
2967 goto syntax;
2968 }
2969
2970 get_io_list:
2971
2972 /* Used in check_io_constraints, where no locus is available. */
2973 spec_end = gfc_current_locus;
2974
2975 /* Optional leading comma (non-standard). */
2976 if (!comma_flag
2977 && gfc_match_char (',') == MATCH_YES
2978 && k == M_WRITE
2979 && gfc_notify_std (GFC_STD_GNU, "Extension: Comma before output "
2980 "item list at %C is an extension") == FAILURE)
2981 return MATCH_ERROR;
2982
2983 io_code = NULL;
2984 if (gfc_match_eos () != MATCH_YES)
2985 {
2986 if (comma_flag && gfc_match_char (',') != MATCH_YES)
2987 {
2988 gfc_error ("Expected comma in I/O list at %C");
2989 m = MATCH_ERROR;
2990 goto cleanup;
2991 }
2992
2993 m = match_io_list (k, &io_code);
2994 if (m == MATCH_ERROR)
2995 goto cleanup;
2996 if (m == MATCH_NO)
2997 goto syntax;
2998 }
2999
3000 /* A full IO statement has been matched. Check the constraints. spec_end is
3001 supplied for cases where no locus is supplied. */
3002 m = check_io_constraints (k, dt, io_code, &spec_end);
3003
3004 if (m == MATCH_ERROR)
3005 goto cleanup;
3006
3007 new_st.op = (k == M_READ) ? EXEC_READ : EXEC_WRITE;
3008 new_st.ext.dt = dt;
3009 new_st.block = gfc_get_code ();
3010 new_st.block->op = new_st.op;
3011 new_st.block->next = io_code;
3012
3013 terminate_io (io_code);
3014
3015 return MATCH_YES;
3016
3017 syntax:
3018 gfc_error ("Syntax error in %s statement at %C", io_kind_name (k));
3019 m = MATCH_ERROR;
3020
3021 cleanup:
3022 gfc_free_dt (dt);
3023 return m;
3024 }
3025
3026
3027 match
3028 gfc_match_read (void)
3029 {
3030 return match_io (M_READ);
3031 }
3032
3033 match
3034 gfc_match_write (void)
3035 {
3036 return match_io (M_WRITE);
3037 }
3038
3039 match
3040 gfc_match_print (void)
3041 {
3042 match m;
3043
3044 m = match_io (M_PRINT);
3045 if (m != MATCH_YES)
3046 return m;
3047
3048 if (gfc_pure (NULL))
3049 {
3050 gfc_error ("PRINT statement at %C not allowed within PURE procedure");
3051 return MATCH_ERROR;
3052 }
3053
3054 return MATCH_YES;
3055 }
3056
3057
3058 /* Free a gfc_inquire structure. */
3059
3060 void
3061 gfc_free_inquire (gfc_inquire *inquire)
3062 {
3063
3064 if (inquire == NULL)
3065 return;
3066
3067 gfc_free_expr (inquire->unit);
3068 gfc_free_expr (inquire->file);
3069 gfc_free_expr (inquire->iomsg);
3070 gfc_free_expr (inquire->iostat);
3071 gfc_free_expr (inquire->exist);
3072 gfc_free_expr (inquire->opened);
3073 gfc_free_expr (inquire->number);
3074 gfc_free_expr (inquire->named);
3075 gfc_free_expr (inquire->name);
3076 gfc_free_expr (inquire->access);
3077 gfc_free_expr (inquire->sequential);
3078 gfc_free_expr (inquire->direct);
3079 gfc_free_expr (inquire->form);
3080 gfc_free_expr (inquire->formatted);
3081 gfc_free_expr (inquire->unformatted);
3082 gfc_free_expr (inquire->recl);
3083 gfc_free_expr (inquire->nextrec);
3084 gfc_free_expr (inquire->blank);
3085 gfc_free_expr (inquire->position);
3086 gfc_free_expr (inquire->action);
3087 gfc_free_expr (inquire->read);
3088 gfc_free_expr (inquire->write);
3089 gfc_free_expr (inquire->readwrite);
3090 gfc_free_expr (inquire->delim);
3091 gfc_free_expr (inquire->pad);
3092 gfc_free_expr (inquire->iolength);
3093 gfc_free_expr (inquire->convert);
3094 gfc_free_expr (inquire->strm_pos);
3095 gfc_free (inquire);
3096 }
3097
3098
3099 /* Match an element of an INQUIRE statement. */
3100
3101 #define RETM if (m != MATCH_NO) return m;
3102
3103 static match
3104 match_inquire_element (gfc_inquire *inquire)
3105 {
3106 match m;
3107
3108 m = match_etag (&tag_unit, &inquire->unit);
3109 RETM m = match_etag (&tag_file, &inquire->file);
3110 RETM m = match_ltag (&tag_err, &inquire->err);
3111 RETM m = match_out_tag (&tag_iomsg, &inquire->iomsg);
3112 RETM m = match_out_tag (&tag_iostat, &inquire->iostat);
3113 RETM m = match_vtag (&tag_exist, &inquire->exist);
3114 RETM m = match_vtag (&tag_opened, &inquire->opened);
3115 RETM m = match_vtag (&tag_named, &inquire->named);
3116 RETM m = match_vtag (&tag_name, &inquire->name);
3117 RETM m = match_out_tag (&tag_number, &inquire->number);
3118 RETM m = match_vtag (&tag_s_access, &inquire->access);
3119 RETM m = match_vtag (&tag_sequential, &inquire->sequential);
3120 RETM m = match_vtag (&tag_direct, &inquire->direct);
3121 RETM m = match_vtag (&tag_s_form, &inquire->form);
3122 RETM m = match_vtag (&tag_formatted, &inquire->formatted);
3123 RETM m = match_vtag (&tag_unformatted, &inquire->unformatted);
3124 RETM m = match_out_tag (&tag_s_recl, &inquire->recl);
3125 RETM m = match_out_tag (&tag_nextrec, &inquire->nextrec);
3126 RETM m = match_vtag (&tag_s_blank, &inquire->blank);
3127 RETM m = match_vtag (&tag_s_position, &inquire->position);
3128 RETM m = match_vtag (&tag_s_action, &inquire->action);
3129 RETM m = match_vtag (&tag_read, &inquire->read);
3130 RETM m = match_vtag (&tag_write, &inquire->write);
3131 RETM m = match_vtag (&tag_readwrite, &inquire->readwrite);
3132 RETM m = match_vtag (&tag_s_delim, &inquire->delim);
3133 RETM m = match_vtag (&tag_s_pad, &inquire->pad);
3134 RETM m = match_vtag (&tag_iolength, &inquire->iolength);
3135 RETM m = match_vtag (&tag_convert, &inquire->convert);
3136 RETM m = match_out_tag (&tag_strm_out, &inquire->strm_pos);
3137 RETM return MATCH_NO;
3138 }
3139
3140 #undef RETM
3141
3142
3143 match
3144 gfc_match_inquire (void)
3145 {
3146 gfc_inquire *inquire;
3147 gfc_code *code;
3148 match m;
3149 locus loc;
3150
3151 m = gfc_match_char ('(');
3152 if (m == MATCH_NO)
3153 return m;
3154
3155 inquire = gfc_getmem (sizeof (gfc_inquire));
3156
3157 loc = gfc_current_locus;
3158
3159 m = match_inquire_element (inquire);
3160 if (m == MATCH_ERROR)
3161 goto cleanup;
3162 if (m == MATCH_NO)
3163 {
3164 m = gfc_match_expr (&inquire->unit);
3165 if (m == MATCH_ERROR)
3166 goto cleanup;
3167 if (m == MATCH_NO)
3168 goto syntax;
3169 }
3170
3171 /* See if we have the IOLENGTH form of the inquire statement. */
3172 if (inquire->iolength != NULL)
3173 {
3174 if (gfc_match_char (')') != MATCH_YES)
3175 goto syntax;
3176
3177 m = match_io_list (M_INQUIRE, &code);
3178 if (m == MATCH_ERROR)
3179 goto cleanup;
3180 if (m == MATCH_NO)
3181 goto syntax;
3182
3183 new_st.op = EXEC_IOLENGTH;
3184 new_st.expr = inquire->iolength;
3185 new_st.ext.inquire = inquire;
3186
3187 if (gfc_pure (NULL))
3188 {
3189 gfc_free_statements (code);
3190 gfc_error ("INQUIRE statement not allowed in PURE procedure at %C");
3191 return MATCH_ERROR;
3192 }
3193
3194 new_st.block = gfc_get_code ();
3195 new_st.block->op = EXEC_IOLENGTH;
3196 terminate_io (code);
3197 new_st.block->next = code;
3198 return MATCH_YES;
3199 }
3200
3201 /* At this point, we have the non-IOLENGTH inquire statement. */
3202 for (;;)
3203 {
3204 if (gfc_match_char (')') == MATCH_YES)
3205 break;
3206 if (gfc_match_char (',') != MATCH_YES)
3207 goto syntax;
3208
3209 m = match_inquire_element (inquire);
3210 if (m == MATCH_ERROR)
3211 goto cleanup;
3212 if (m == MATCH_NO)
3213 goto syntax;
3214
3215 if (inquire->iolength != NULL)
3216 {
3217 gfc_error ("IOLENGTH tag invalid in INQUIRE statement at %C");
3218 goto cleanup;
3219 }
3220 }
3221
3222 if (gfc_match_eos () != MATCH_YES)
3223 goto syntax;
3224
3225 if (inquire->unit != NULL && inquire->file != NULL)
3226 {
3227 gfc_error ("INQUIRE statement at %L cannot contain both FILE and "
3228 "UNIT specifiers", &loc);
3229 goto cleanup;
3230 }
3231
3232 if (inquire->unit == NULL && inquire->file == NULL)
3233 {
3234 gfc_error ("INQUIRE statement at %L requires either FILE or "
3235 "UNIT specifier", &loc);
3236 goto cleanup;
3237 }
3238
3239 if (gfc_pure (NULL))
3240 {
3241 gfc_error ("INQUIRE statement not allowed in PURE procedure at %C");
3242 goto cleanup;
3243 }
3244
3245 new_st.op = EXEC_INQUIRE;
3246 new_st.ext.inquire = inquire;
3247 return MATCH_YES;
3248
3249 syntax:
3250 gfc_syntax_error (ST_INQUIRE);
3251
3252 cleanup:
3253 gfc_free_inquire (inquire);
3254 return MATCH_ERROR;
3255 }
3256
3257
3258 /* Resolve everything in a gfc_inquire structure. */
3259
3260 try
3261 gfc_resolve_inquire (gfc_inquire *inquire)
3262 {
3263 RESOLVE_TAG (&tag_unit, inquire->unit);
3264 RESOLVE_TAG (&tag_file, inquire->file);
3265 RESOLVE_TAG (&tag_iomsg, inquire->iomsg);
3266 RESOLVE_TAG (&tag_iostat, inquire->iostat);
3267 RESOLVE_TAG (&tag_exist, inquire->exist);
3268 RESOLVE_TAG (&tag_opened, inquire->opened);
3269 RESOLVE_TAG (&tag_number, inquire->number);
3270 RESOLVE_TAG (&tag_named, inquire->named);
3271 RESOLVE_TAG (&tag_name, inquire->name);
3272 RESOLVE_TAG (&tag_s_access, inquire->access);
3273 RESOLVE_TAG (&tag_sequential, inquire->sequential);
3274 RESOLVE_TAG (&tag_direct, inquire->direct);
3275 RESOLVE_TAG (&tag_s_form, inquire->form);
3276 RESOLVE_TAG (&tag_formatted, inquire->formatted);
3277 RESOLVE_TAG (&tag_unformatted, inquire->unformatted);
3278 RESOLVE_TAG (&tag_s_recl, inquire->recl);
3279 RESOLVE_TAG (&tag_nextrec, inquire->nextrec);
3280 RESOLVE_TAG (&tag_s_blank, inquire->blank);
3281 RESOLVE_TAG (&tag_s_position, inquire->position);
3282 RESOLVE_TAG (&tag_s_action, inquire->action);
3283 RESOLVE_TAG (&tag_read, inquire->read);
3284 RESOLVE_TAG (&tag_write, inquire->write);
3285 RESOLVE_TAG (&tag_readwrite, inquire->readwrite);
3286 RESOLVE_TAG (&tag_s_delim, inquire->delim);
3287 RESOLVE_TAG (&tag_s_pad, inquire->pad);
3288 RESOLVE_TAG (&tag_iolength, inquire->iolength);
3289 RESOLVE_TAG (&tag_convert, inquire->convert);
3290 RESOLVE_TAG (&tag_strm_out, inquire->strm_pos);
3291
3292 if (gfc_reference_st_label (inquire->err, ST_LABEL_TARGET) == FAILURE)
3293 return FAILURE;
3294
3295 return SUCCESS;
3296 }