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Remove old autovect-branch by moving to "dead" directory.
[official-gcc.git] / old-autovect-branch / gcc / fortran / io.c
blob23c1cb24132fa03da0fc921f395fdb4be7b8eced
1 /* Deal with I/O statements & related stuff.
2 Copyright (C) 2000, 2001, 2002, 2003, 2004, 2005 Free Software Foundation,
3 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 2, 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 COPYING. If not, write to the Free
20 Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
21 02110-1301, USA. */
22
23 #include "config.h"
24 #include "system.h"
25 #include "flags.h"
26 #include "gfortran.h"
27 #include "match.h"
28 #include "parse.h"
29
30 gfc_st_label format_asterisk =
31 { -1, ST_LABEL_FORMAT, ST_LABEL_FORMAT, NULL, 0,
32 {NULL, NULL}, NULL, NULL};
33
34 typedef struct
35 {
36 const char *name, *spec;
37 bt type;
38 }
39 io_tag;
40
41 static const io_tag
42 tag_file = { "FILE", " file = %e", BT_CHARACTER },
43 tag_status = { "STATUS", " status = %e", BT_CHARACTER},
44 tag_e_access = {"ACCESS", " access = %e", BT_CHARACTER},
45 tag_e_form = {"FORM", " form = %e", BT_CHARACTER},
46 tag_e_recl = {"RECL", " recl = %e", BT_INTEGER},
47 tag_e_blank = {"BLANK", " blank = %e", BT_CHARACTER},
48 tag_e_position = {"POSITION", " position = %e", BT_CHARACTER},
49 tag_e_action = {"ACTION", " action = %e", BT_CHARACTER},
50 tag_e_delim = {"DELIM", " delim = %e", BT_CHARACTER},
51 tag_e_pad = {"PAD", " pad = %e", BT_CHARACTER},
52 tag_unit = {"UNIT", " unit = %e", BT_INTEGER},
53 tag_advance = {"ADVANCE", " advance = %e", BT_CHARACTER},
54 tag_rec = {"REC", " rec = %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_err = {"ERR", " err = %l", BT_UNKNOWN},
83 tag_end = {"END", " end = %l", BT_UNKNOWN},
84 tag_eor = {"EOR", " eor = %l", BT_UNKNOWN};
85
86 static gfc_dt *current_dt;
87
88 #define RESOLVE_TAG(x, y) if (resolve_tag(x, y) == FAILURE) return FAILURE;
89
90
91 /**************** Fortran 95 FORMAT parser *****************/
92
93 /* FORMAT tokens returned by format_lex(). */
94 typedef enum
95 {
96 FMT_NONE, FMT_UNKNOWN, FMT_SIGNED_INT, FMT_ZERO, FMT_POSINT, FMT_PERIOD,
97 FMT_COMMA, FMT_COLON, FMT_SLASH, FMT_DOLLAR, FMT_POS, FMT_LPAREN,
98 FMT_RPAREN, FMT_X, FMT_SIGN, FMT_BLANK, FMT_CHAR, FMT_P, FMT_IBOZ, FMT_F,
99 FMT_E, FMT_EXT, FMT_G, FMT_L, FMT_A, FMT_D, FMT_H, FMT_END
100 }
101 format_token;
102
103 /* Local variables for checking format strings. The saved_token is
104 used to back up by a single format token during the parsing
105 process. */
106 static char *format_string;
107 static int format_length, use_last_char;
108
109 static format_token saved_token;
110
111 static enum
112 { MODE_STRING, MODE_FORMAT, MODE_COPY }
113 mode;
114
115
116 /* Return the next character in the format string. */
117
118 static char
119 next_char (int in_string)
120 {
121 static char c;
122
123 if (use_last_char)
124 {
125 use_last_char = 0;
126 return c;
127 }
128
129 format_length++;
130
131 if (mode == MODE_STRING)
132 c = *format_string++;
133 else
134 {
135 c = gfc_next_char_literal (in_string);
136 if (c == '\n')
137 c = '\0';
138
139 if (mode == MODE_COPY)
140 *format_string++ = c;
141 }
142
143 c = TOUPPER (c);
144 return c;
145 }
146
147
148 /* Back up one character position. Only works once. */
149
150 static void
151 unget_char (void)
152 {
153
154 use_last_char = 1;
155 }
156
157 static int value = 0;
158
159 /* Simple lexical analyzer for getting the next token in a FORMAT
160 statement. */
161
162 static format_token
163 format_lex (void)
164 {
165 format_token token;
166 char c, delim;
167 int zflag;
168 int negative_flag;
169
170 if (saved_token != FMT_NONE)
171 {
172 token = saved_token;
173 saved_token = FMT_NONE;
174 return token;
175 }
176
177 do
178 {
179 c = next_char (0);
180 }
181 while (gfc_is_whitespace (c));
182
183 negative_flag = 0;
184 switch (c)
185 {
186 case '-':
187 negative_flag = 1;
188 case '+':
189 c = next_char (0);
190 if (!ISDIGIT (c))
191 {
192 token = FMT_UNKNOWN;
193 break;
194 }
195
196 value = c - '0';
197
198 do
199 {
200 c = next_char (0);
201 if(ISDIGIT (c))
202 value = 10 * value + c - '0';
203 }
204 while (ISDIGIT (c));
205
206 unget_char ();
207
208 if (negative_flag)
209 value = -value;
210
211 token = FMT_SIGNED_INT;
212 break;
213
214 case '0':
215 case '1':
216 case '2':
217 case '3':
218 case '4':
219 case '5':
220 case '6':
221 case '7':
222 case '8':
223 case '9':
224 zflag = (c == '0');
225
226 value = c - '0';
227
228 do
229 {
230 c = next_char (0);
231 if (c != '0')
232 zflag = 0;
233 if (ISDIGIT (c))
234 value = 10 * value + c - '0';
235 }
236 while (ISDIGIT (c) || gfc_is_whitespace(c));
237
238 unget_char ();
239 token = zflag ? FMT_ZERO : FMT_POSINT;
240 break;
241
242 case '.':
243 token = FMT_PERIOD;
244 break;
245
246 case ',':
247 token = FMT_COMMA;
248 break;
249
250 case ':':
251 token = FMT_COLON;
252 break;
253
254 case '/':
255 token = FMT_SLASH;
256 break;
257
258 case '$':
259 token = FMT_DOLLAR;
260 break;
261
262 case 'T':
263 c = next_char (0);
264 if (c != 'L' && c != 'R')
265 unget_char ();
266
267 token = FMT_POS;
268 break;
269
270 case '(':
271 token = FMT_LPAREN;
272 break;
273
274 case ')':
275 token = FMT_RPAREN;
276 break;
277
278 case 'X':
279 token = FMT_X;
280 break;
281
282 case 'S':
283 c = next_char (0);
284 if (c != 'P' && c != 'S')
285 unget_char ();
286
287 token = FMT_SIGN;
288 break;
289
290 case 'B':
291 c = next_char (0);
292 if (c == 'N' || c == 'Z')
293 token = FMT_BLANK;
294 else
295 {
296 unget_char ();
297 token = FMT_IBOZ;
298 }
299
300 break;
301
302 case '\'':
303 case '"':
304 delim = c;
305
306 value = 0;
307
308 for (;;)
309 {
310 c = next_char (1);
311 if (c == '\0')
312 {
313 token = FMT_END;
314 break;
315 }
316
317 if (c == delim)
318 {
319 c = next_char (1);
320
321 if (c == '\0')
322 {
323 token = FMT_END;
324 break;
325 }
326
327 if (c != delim)
328 {
329 unget_char ();
330 token = FMT_CHAR;
331 break;
332 }
333 }
334 value++;
335 }
336 break;
337
338 case 'P':
339 token = FMT_P;
340 break;
341
342 case 'I':
343 case 'O':
344 case 'Z':
345 token = FMT_IBOZ;
346 break;
347
348 case 'F':
349 token = FMT_F;
350 break;
351
352 case 'E':
353 c = next_char (0);
354 if (c == 'N' || c == 'S')
355 token = FMT_EXT;
356 else
357 {
358 token = FMT_E;
359 unget_char ();
360 }
361
362 break;
363
364 case 'G':
365 token = FMT_G;
366 break;
367
368 case 'H':
369 token = FMT_H;
370 break;
371
372 case 'L':
373 token = FMT_L;
374 break;
375
376 case 'A':
377 token = FMT_A;
378 break;
379
380 case 'D':
381 token = FMT_D;
382 break;
383
384 case '\0':
385 token = FMT_END;
386 break;
387
388 default:
389 token = FMT_UNKNOWN;
390 break;
391 }
392
393 return token;
394 }
395
396
397 /* Check a format statement. The format string, either from a FORMAT
398 statement or a constant in an I/O statement has already been parsed
399 by itself, and we are checking it for validity. The dual origin
400 means that the warning message is a little less than great. */
401
402 static try
403 check_format (void)
404 {
405 const char *posint_required = _("Positive width required");
406 const char *period_required = _("Period required");
407 const char *nonneg_required = _("Nonnegative width required");
408 const char *unexpected_element = _("Unexpected element");
409 const char *unexpected_end = _("Unexpected end of format string");
410
411 const char *error;
412 format_token t, u;
413 int level;
414 int repeat;
415 try rv;
416
417 use_last_char = 0;
418 saved_token = FMT_NONE;
419 level = 0;
420 repeat = 0;
421 rv = SUCCESS;
422
423 t = format_lex ();
424 if (t != FMT_LPAREN)
425 {
426 error = _("Missing leading left parenthesis");
427 goto syntax;
428 }
429
430 t = format_lex ();
431 if (t == FMT_RPAREN)
432 goto finished; /* Empty format is legal */
433 saved_token = t;
434
435 format_item:
436 /* In this state, the next thing has to be a format item. */
437 t = format_lex ();
438 format_item_1:
439 switch (t)
440 {
441 case FMT_POSINT:
442 repeat = value;
443 t = format_lex ();
444 if (t == FMT_LPAREN)
445 {
446 level++;
447 goto format_item;
448 }
449
450 if (t == FMT_SLASH)
451 goto optional_comma;
452
453 goto data_desc;
454
455 case FMT_LPAREN:
456 level++;
457 goto format_item;
458
459 case FMT_SIGNED_INT:
460 /* Signed integer can only precede a P format. */
461 t = format_lex ();
462 if (t != FMT_P)
463 {
464 error = _("Expected P edit descriptor");
465 goto syntax;
466 }
467
468 goto data_desc;
469
470 case FMT_P:
471 /* P requires a prior number. */
472 error = _("P descriptor requires leading scale factor");
473 goto syntax;
474
475 case FMT_X:
476 /* X requires a prior number if we're being pedantic. */
477 if (gfc_notify_std (GFC_STD_GNU, "Extension: X descriptor "
478 "requires leading space count at %C")
479 == FAILURE)
480 return FAILURE;
481 goto between_desc;
482
483 case FMT_SIGN:
484 case FMT_BLANK:
485 goto between_desc;
486
487 case FMT_CHAR:
488 goto extension_optional_comma;
489
490 case FMT_COLON:
491 case FMT_SLASH:
492 goto optional_comma;
493
494 case FMT_DOLLAR:
495 t = format_lex ();
496
497 if (gfc_notify_std (GFC_STD_GNU, "Extension: $ descriptor at %C")
498 == FAILURE)
499 return FAILURE;
500 if (t != FMT_RPAREN || level > 0)
501 {
502 error = _("$ must be the last specifier");
503 goto syntax;
504 }
505
506 goto finished;
507
508 case FMT_POS:
509 case FMT_IBOZ:
510 case FMT_F:
511 case FMT_E:
512 case FMT_EXT:
513 case FMT_G:
514 case FMT_L:
515 case FMT_A:
516 case FMT_D:
517 goto data_desc;
518
519 case FMT_H:
520 goto data_desc;
521
522 case FMT_END:
523 error = unexpected_end;
524 goto syntax;
525
526 default:
527 error = unexpected_element;
528 goto syntax;
529 }
530
531 data_desc:
532 /* In this state, t must currently be a data descriptor.
533 Deal with things that can/must follow the descriptor. */
534 switch (t)
535 {
536 case FMT_SIGN:
537 case FMT_BLANK:
538 case FMT_X:
539 break;
540
541 case FMT_P:
542 if (pedantic)
543 {
544 t = format_lex ();
545 if (t == FMT_POSINT)
546 {
547 error = _("Repeat count cannot follow P descriptor");
548 goto syntax;
549 }
550
551 saved_token = t;
552 }
553
554 goto optional_comma;
555
556 case FMT_POS:
557 case FMT_L:
558 t = format_lex ();
559 if (t == FMT_POSINT)
560 break;
561
562 error = posint_required;
563 goto syntax;
564
565 case FMT_A:
566 t = format_lex ();
567 if (t != FMT_POSINT)
568 saved_token = t;
569 break;
570
571 case FMT_D:
572 case FMT_E:
573 case FMT_G:
574 case FMT_EXT:
575 u = format_lex ();
576 if (u != FMT_POSINT)
577 {
578 error = posint_required;
579 goto syntax;
580 }
581
582 u = format_lex ();
583 if (u != FMT_PERIOD)
584 {
585 error = period_required;
586 goto syntax;
587 }
588
589 u = format_lex ();
590 if (u != FMT_ZERO && u != FMT_POSINT)
591 {
592 error = nonneg_required;
593 goto syntax;
594 }
595
596 if (t == FMT_D)
597 break;
598
599 /* Look for optional exponent. */
600 u = format_lex ();
601 if (u != FMT_E)
602 {
603 saved_token = u;
604 }
605 else
606 {
607 u = format_lex ();
608 if (u != FMT_POSINT)
609 {
610 error = _("Positive exponent width required");
611 goto syntax;
612 }
613 }
614
615 break;
616
617 case FMT_F:
618 t = format_lex ();
619 if (t != FMT_ZERO && t != FMT_POSINT)
620 {
621 error = nonneg_required;
622 goto syntax;
623 }
624
625 t = format_lex ();
626 if (t != FMT_PERIOD)
627 {
628 error = period_required;
629 goto syntax;
630 }
631
632 t = format_lex ();
633 if (t != FMT_ZERO && t != FMT_POSINT)
634 {
635 error = nonneg_required;
636 goto syntax;
637 }
638
639 break;
640
641 case FMT_H:
642 if(mode == MODE_STRING)
643 {
644 format_string += value;
645 format_length -= value;
646 }
647 else
648 {
649 while(repeat >0)
650 {
651 next_char(1);
652 repeat -- ;
653 }
654 }
655 break;
656
657 case FMT_IBOZ:
658 t = format_lex ();
659 if (t != FMT_ZERO && t != FMT_POSINT)
660 {
661 error = nonneg_required;
662 goto syntax;
663 }
664
665 t = format_lex ();
666 if (t != FMT_PERIOD)
667 {
668 saved_token = t;
669 }
670 else
671 {
672 t = format_lex ();
673 if (t != FMT_ZERO && t != FMT_POSINT)
674 {
675 error = nonneg_required;
676 goto syntax;
677 }
678 }
679
680 break;
681
682 default:
683 error = unexpected_element;
684 goto syntax;
685 }
686
687 between_desc:
688 /* Between a descriptor and what comes next. */
689 t = format_lex ();
690 switch (t)
691 {
692
693 case FMT_COMMA:
694 goto format_item;
695
696 case FMT_RPAREN:
697 level--;
698 if (level < 0)
699 goto finished;
700 goto between_desc;
701
702 case FMT_COLON:
703 case FMT_SLASH:
704 goto optional_comma;
705
706 case FMT_END:
707 error = unexpected_end;
708 goto syntax;
709
710 default:
711 if (gfc_notify_std (GFC_STD_GNU, "Extension: Missing comma at %C")
712 == FAILURE)
713 return FAILURE;
714 goto format_item_1;
715 }
716
717 optional_comma:
718 /* Optional comma is a weird between state where we've just finished
719 reading a colon, slash or P descriptor. */
720 t = format_lex ();
721 switch (t)
722 {
723 case FMT_COMMA:
724 break;
725
726 case FMT_RPAREN:
727 level--;
728 if (level < 0)
729 goto finished;
730 goto between_desc;
731
732 default:
733 /* Assume that we have another format item. */
734 saved_token = t;
735 break;
736 }
737
738 goto format_item;
739
740 extension_optional_comma:
741 /* As a GNU extension, permit a missing comma after a string literal. */
742 t = format_lex ();
743 switch (t)
744 {
745 case FMT_COMMA:
746 break;
747
748 case FMT_RPAREN:
749 level--;
750 if (level < 0)
751 goto finished;
752 goto between_desc;
753
754 case FMT_COLON:
755 case FMT_SLASH:
756 goto optional_comma;
757
758 case FMT_END:
759 error = unexpected_end;
760 goto syntax;
761
762 default:
763 if (gfc_notify_std (GFC_STD_GNU, "Extension: Missing comma at %C")
764 == FAILURE)
765 return FAILURE;
766 saved_token = t;
767 break;
768 }
769
770 goto format_item;
771
772 syntax:
773 /* Something went wrong. If the format we're checking is a string,
774 generate a warning, since the program is correct. If the format
775 is in a FORMAT statement, this messes up parsing, which is an
776 error. */
777 if (mode != MODE_STRING)
778 gfc_error ("%s in format string at %C", error);
779 else
780 {
781 gfc_warning ("%s in format string at %C", error);
782
783 /* TODO: More elaborate measures are needed to show where a problem
784 is within a format string that has been calculated. */
785 }
786
787 rv = FAILURE;
788
789 finished:
790 return rv;
791 }
792
793
794 /* Given an expression node that is a constant string, see if it looks
795 like a format string. */
796
797 static void
798 check_format_string (gfc_expr * e)
799 {
800
801 mode = MODE_STRING;
802 format_string = e->value.character.string;
803 check_format ();
804 }
805
806
807 /************ Fortran 95 I/O statement matchers *************/
808
809 /* Match a FORMAT statement. This amounts to actually parsing the
810 format descriptors in order to correctly locate the end of the
811 format string. */
812
813 match
814 gfc_match_format (void)
815 {
816 gfc_expr *e;
817 locus start;
818
819 if (gfc_statement_label == NULL)
820 {
821 gfc_error ("Missing format label at %C");
822 return MATCH_ERROR;
823 }
824 gfc_gobble_whitespace ();
825
826 mode = MODE_FORMAT;
827 format_length = 0;
828
829 start = gfc_current_locus;
830
831 if (check_format () == FAILURE)
832 return MATCH_ERROR;
833
834 if (gfc_match_eos () != MATCH_YES)
835 {
836 gfc_syntax_error (ST_FORMAT);
837 return MATCH_ERROR;
838 }
839
840 /* The label doesn't get created until after the statement is done
841 being matched, so we have to leave the string for later. */
842
843 gfc_current_locus = start; /* Back to the beginning */
844
845 new_st.loc = start;
846 new_st.op = EXEC_NOP;
847
848 e = gfc_get_expr();
849 e->expr_type = EXPR_CONSTANT;
850 e->ts.type = BT_CHARACTER;
851 e->ts.kind = gfc_default_character_kind;
852 e->where = start;
853 e->value.character.string = format_string = gfc_getmem(format_length+1);
854 e->value.character.length = format_length;
855 gfc_statement_label->format = e;
856
857 mode = MODE_COPY;
858 check_format (); /* Guaranteed to succeed */
859 gfc_match_eos (); /* Guaranteed to succeed */
860
861 return MATCH_YES;
862 }
863
864
865 /* Match an expression I/O tag of some sort. */
866
867 static match
868 match_etag (const io_tag * tag, gfc_expr ** v)
869 {
870 gfc_expr *result;
871 match m;
872
873 m = gfc_match (tag->spec, &result);
874 if (m != MATCH_YES)
875 return m;
876
877 if (*v != NULL)
878 {
879 gfc_error ("Duplicate %s specification at %C", tag->name);
880 gfc_free_expr (result);
881 return MATCH_ERROR;
882 }
883
884 *v = result;
885 return MATCH_YES;
886 }
887
888
889 /* Match a variable I/O tag of some sort. */
890
891 static match
892 match_vtag (const io_tag * tag, gfc_expr ** v)
893 {
894 gfc_expr *result;
895 match m;
896
897 m = gfc_match (tag->spec, &result);
898 if (m != MATCH_YES)
899 return m;
900
901 if (*v != NULL)
902 {
903 gfc_error ("Duplicate %s specification at %C", tag->name);
904 gfc_free_expr (result);
905 return MATCH_ERROR;
906 }
907
908 if (result->symtree->n.sym->attr.intent == INTENT_IN)
909 {
910 gfc_error ("Variable tag cannot be INTENT(IN) at %C");
911 gfc_free_expr (result);
912 return MATCH_ERROR;
913 }
914
915 if (gfc_pure (NULL) && gfc_impure_variable (result->symtree->n.sym))
916 {
917 gfc_error ("Variable tag cannot be assigned in PURE procedure at %C");
918 gfc_free_expr (result);
919 return MATCH_ERROR;
920 }
921
922 *v = result;
923 return MATCH_YES;
924 }
925
926
927 /* Match I/O tags that cause variables to become redefined. */
928
929 static match
930 match_out_tag(const io_tag *tag, gfc_expr **result)
931 {
932 match m;
933
934 m = match_vtag(tag, result);
935 if (m == MATCH_YES)
936 gfc_check_do_variable((*result)->symtree);
937
938 return m;
939 }
940
941
942 /* Match a label I/O tag. */
943
944 static match
945 match_ltag (const io_tag * tag, gfc_st_label ** label)
946 {
947 match m;
948 gfc_st_label *old;
949
950 old = *label;
951 m = gfc_match (tag->spec, label);
952 if (m == MATCH_YES && old != 0)
953 {
954 gfc_error ("Duplicate %s label specification at %C", tag->name);
955 return MATCH_ERROR;
956 }
957
958 return m;
959 }
960
961
962 /* Do expression resolution and type-checking on an expression tag. */
963
964 static try
965 resolve_tag (const io_tag * tag, gfc_expr * e)
966 {
967
968 if (e == NULL)
969 return SUCCESS;
970
971 if (gfc_resolve_expr (e) == FAILURE)
972 return FAILURE;
973
974 if (e->ts.type != tag->type && tag != &tag_format)
975 {
976 gfc_error ("%s tag at %L must be of type %s", tag->name,
977 &e->where, gfc_basic_typename (tag->type));
978 return FAILURE;
979 }
980
981 if (tag == &tag_format)
982 {
983 if (e->expr_type == EXPR_CONSTANT
984 && (e->ts.type != BT_CHARACTER
985 || e->ts.kind != gfc_default_character_kind))
986 {
987 gfc_error ("Constant expression in FORMAT tag at %L must be "
988 "of type default CHARACTER", &e->where);
989 return FAILURE;
990 }
991
992 /* If e's rank is zero and e is not an element of an array, it should be
993 of integer or character type. The integer variable should be
994 ASSIGNED. */
995 if (e->symtree == NULL || e->symtree->n.sym->as == NULL
996 || e->symtree->n.sym->as->rank == 0)
997 {
998 if (e->ts.type != BT_CHARACTER && e->ts.type != BT_INTEGER)
999 {
1000 gfc_error ("%s tag at %L must be of type %s or %s", tag->name,
1001 &e->where, gfc_basic_typename (BT_CHARACTER),
1002 gfc_basic_typename (BT_INTEGER));
1003 return FAILURE;
1004 }
1005 else if (e->ts.type == BT_INTEGER && e->expr_type == EXPR_VARIABLE)
1006 {
1007 if (gfc_notify_std (GFC_STD_F95_DEL,
1008 "Obsolete: ASSIGNED variable in FORMAT tag at %L",
1009 &e->where) == FAILURE)
1010 return FAILURE;
1011 if (e->symtree->n.sym->attr.assign != 1)
1012 {
1013 gfc_error ("Variable '%s' at %L has not been assigned a "
1014 "format label", e->symtree->n.sym->name, &e->where);
1015 return FAILURE;
1016 }
1017 }
1018 return SUCCESS;
1019 }
1020 else
1021 {
1022 /* if rank is nonzero, we allow the type to be character under
1023 GFC_STD_GNU and other type under GFC_STD_LEGACY. It may be
1024 assigned an Hollerith constant. */
1025 if (e->ts.type == BT_CHARACTER)
1026 {
1027 if (gfc_notify_std (GFC_STD_GNU,
1028 "Extension: Character array in FORMAT tag at %L",
1029 &e->where) == FAILURE)
1030 return FAILURE;
1031 }
1032 else
1033 {
1034 if (gfc_notify_std (GFC_STD_LEGACY,
1035 "Extension: Non-character in FORMAT tag at %L",
1036 &e->where) == FAILURE)
1037 return FAILURE;
1038 }
1039 return SUCCESS;
1040 }
1041 }
1042 else
1043 {
1044 if (e->rank != 0)
1045 {
1046 gfc_error ("%s tag at %L must be scalar", tag->name, &e->where);
1047 return FAILURE;
1048 }
1049
1050 if (tag == &tag_iomsg)
1051 {
1052 if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: IOMSG tag at %L",
1053 &e->where) == FAILURE)
1054 return FAILURE;
1055 }
1056
1057 if (tag == &tag_iostat && e->ts.kind != gfc_default_integer_kind)
1058 {
1059 if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: Non-default "
1060 "integer kind in IOSTAT tag at %L",
1061 &e->where) == FAILURE)
1062 return FAILURE;
1063 }
1064
1065 if (tag == &tag_convert)
1066 {
1067 if (gfc_notify_std (GFC_STD_GNU, "Extension: CONVERT tag at %L",
1068 &e->where) == FAILURE)
1069 return FAILURE;
1070 }
1071 }
1072
1073 return SUCCESS;
1074 }
1075
1076
1077 /* Match a single tag of an OPEN statement. */
1078
1079 static match
1080 match_open_element (gfc_open * open)
1081 {
1082 match m;
1083
1084 m = match_etag (&tag_unit, &open->unit);
1085 if (m != MATCH_NO)
1086 return m;
1087 m = match_out_tag (&tag_iomsg, &open->iomsg);
1088 if (m != MATCH_NO)
1089 return m;
1090 m = match_out_tag (&tag_iostat, &open->iostat);
1091 if (m != MATCH_NO)
1092 return m;
1093 m = match_etag (&tag_file, &open->file);
1094 if (m != MATCH_NO)
1095 return m;
1096 m = match_etag (&tag_status, &open->status);
1097 if (m != MATCH_NO)
1098 return m;
1099 m = match_etag (&tag_e_access, &open->access);
1100 if (m != MATCH_NO)
1101 return m;
1102 m = match_etag (&tag_e_form, &open->form);
1103 if (m != MATCH_NO)
1104 return m;
1105 m = match_etag (&tag_e_recl, &open->recl);
1106 if (m != MATCH_NO)
1107 return m;
1108 m = match_etag (&tag_e_blank, &open->blank);
1109 if (m != MATCH_NO)
1110 return m;
1111 m = match_etag (&tag_e_position, &open->position);
1112 if (m != MATCH_NO)
1113 return m;
1114 m = match_etag (&tag_e_action, &open->action);
1115 if (m != MATCH_NO)
1116 return m;
1117 m = match_etag (&tag_e_delim, &open->delim);
1118 if (m != MATCH_NO)
1119 return m;
1120 m = match_etag (&tag_e_pad, &open->pad);
1121 if (m != MATCH_NO)
1122 return m;
1123 m = match_ltag (&tag_err, &open->err);
1124 if (m != MATCH_NO)
1125 return m;
1126 m = match_etag (&tag_convert, &open->convert);
1127 if (m != MATCH_NO)
1128 return m;
1129
1130 return MATCH_NO;
1131 }
1132
1133
1134 /* Free the gfc_open structure and all the expressions it contains. */
1135
1136 void
1137 gfc_free_open (gfc_open * open)
1138 {
1139
1140 if (open == NULL)
1141 return;
1142
1143 gfc_free_expr (open->unit);
1144 gfc_free_expr (open->iomsg);
1145 gfc_free_expr (open->iostat);
1146 gfc_free_expr (open->file);
1147 gfc_free_expr (open->status);
1148 gfc_free_expr (open->access);
1149 gfc_free_expr (open->form);
1150 gfc_free_expr (open->recl);
1151 gfc_free_expr (open->blank);
1152 gfc_free_expr (open->position);
1153 gfc_free_expr (open->action);
1154 gfc_free_expr (open->delim);
1155 gfc_free_expr (open->pad);
1156 gfc_free_expr (open->convert);
1157
1158 gfc_free (open);
1159 }
1160
1161
1162 /* Resolve everything in a gfc_open structure. */
1163
1164 try
1165 gfc_resolve_open (gfc_open * open)
1166 {
1167
1168 RESOLVE_TAG (&tag_unit, open->unit);
1169 RESOLVE_TAG (&tag_iomsg, open->iomsg);
1170 RESOLVE_TAG (&tag_iostat, open->iostat);
1171 RESOLVE_TAG (&tag_file, open->file);
1172 RESOLVE_TAG (&tag_status, open->status);
1173 RESOLVE_TAG (&tag_e_access, open->access);
1174 RESOLVE_TAG (&tag_e_form, open->form);
1175 RESOLVE_TAG (&tag_e_recl, open->recl);
1176
1177 RESOLVE_TAG (&tag_e_blank, open->blank);
1178 RESOLVE_TAG (&tag_e_position, open->position);
1179 RESOLVE_TAG (&tag_e_action, open->action);
1180 RESOLVE_TAG (&tag_e_delim, open->delim);
1181 RESOLVE_TAG (&tag_e_pad, open->pad);
1182 RESOLVE_TAG (&tag_convert, open->convert);
1183
1184 if (gfc_reference_st_label (open->err, ST_LABEL_TARGET) == FAILURE)
1185 return FAILURE;
1186
1187 return SUCCESS;
1188 }
1189
1190
1191 /* Match an OPEN statement. */
1192
1193 match
1194 gfc_match_open (void)
1195 {
1196 gfc_open *open;
1197 match m;
1198
1199 m = gfc_match_char ('(');
1200 if (m == MATCH_NO)
1201 return m;
1202
1203 open = gfc_getmem (sizeof (gfc_open));
1204
1205 m = match_open_element (open);
1206
1207 if (m == MATCH_ERROR)
1208 goto cleanup;
1209 if (m == MATCH_NO)
1210 {
1211 m = gfc_match_expr (&open->unit);
1212 if (m == MATCH_NO)
1213 goto syntax;
1214 if (m == MATCH_ERROR)
1215 goto cleanup;
1216 }
1217
1218 for (;;)
1219 {
1220 if (gfc_match_char (')') == MATCH_YES)
1221 break;
1222 if (gfc_match_char (',') != MATCH_YES)
1223 goto syntax;
1224
1225 m = match_open_element (open);
1226 if (m == MATCH_ERROR)
1227 goto cleanup;
1228 if (m == MATCH_NO)
1229 goto syntax;
1230 }
1231
1232 if (gfc_match_eos () == MATCH_NO)
1233 goto syntax;
1234
1235 if (gfc_pure (NULL))
1236 {
1237 gfc_error ("OPEN statement not allowed in PURE procedure at %C");
1238 goto cleanup;
1239 }
1240
1241 new_st.op = EXEC_OPEN;
1242 new_st.ext.open = open;
1243 return MATCH_YES;
1244
1245 syntax:
1246 gfc_syntax_error (ST_OPEN);
1247
1248 cleanup:
1249 gfc_free_open (open);
1250 return MATCH_ERROR;
1251 }
1252
1253
1254 /* Free a gfc_close structure an all its expressions. */
1255
1256 void
1257 gfc_free_close (gfc_close * close)
1258 {
1259
1260 if (close == NULL)
1261 return;
1262
1263 gfc_free_expr (close->unit);
1264 gfc_free_expr (close->iomsg);
1265 gfc_free_expr (close->iostat);
1266 gfc_free_expr (close->status);
1267
1268 gfc_free (close);
1269 }
1270
1271
1272 /* Match elements of a CLOSE statement. */
1273
1274 static match
1275 match_close_element (gfc_close * close)
1276 {
1277 match m;
1278
1279 m = match_etag (&tag_unit, &close->unit);
1280 if (m != MATCH_NO)
1281 return m;
1282 m = match_etag (&tag_status, &close->status);
1283 if (m != MATCH_NO)
1284 return m;
1285 m = match_out_tag (&tag_iomsg, &close->iomsg);
1286 if (m != MATCH_NO)
1287 return m;
1288 m = match_out_tag (&tag_iostat, &close->iostat);
1289 if (m != MATCH_NO)
1290 return m;
1291 m = match_ltag (&tag_err, &close->err);
1292 if (m != MATCH_NO)
1293 return m;
1294
1295 return MATCH_NO;
1296 }
1297
1298
1299 /* Match a CLOSE statement. */
1300
1301 match
1302 gfc_match_close (void)
1303 {
1304 gfc_close *close;
1305 match m;
1306
1307 m = gfc_match_char ('(');
1308 if (m == MATCH_NO)
1309 return m;
1310
1311 close = gfc_getmem (sizeof (gfc_close));
1312
1313 m = match_close_element (close);
1314
1315 if (m == MATCH_ERROR)
1316 goto cleanup;
1317 if (m == MATCH_NO)
1318 {
1319 m = gfc_match_expr (&close->unit);
1320 if (m == MATCH_NO)
1321 goto syntax;
1322 if (m == MATCH_ERROR)
1323 goto cleanup;
1324 }
1325
1326 for (;;)
1327 {
1328 if (gfc_match_char (')') == MATCH_YES)
1329 break;
1330 if (gfc_match_char (',') != MATCH_YES)
1331 goto syntax;
1332
1333 m = match_close_element (close);
1334 if (m == MATCH_ERROR)
1335 goto cleanup;
1336 if (m == MATCH_NO)
1337 goto syntax;
1338 }
1339
1340 if (gfc_match_eos () == MATCH_NO)
1341 goto syntax;
1342
1343 if (gfc_pure (NULL))
1344 {
1345 gfc_error ("CLOSE statement not allowed in PURE procedure at %C");
1346 goto cleanup;
1347 }
1348
1349 new_st.op = EXEC_CLOSE;
1350 new_st.ext.close = close;
1351 return MATCH_YES;
1352
1353 syntax:
1354 gfc_syntax_error (ST_CLOSE);
1355
1356 cleanup:
1357 gfc_free_close (close);
1358 return MATCH_ERROR;
1359 }
1360
1361
1362 /* Resolve everything in a gfc_close structure. */
1363
1364 try
1365 gfc_resolve_close (gfc_close * close)
1366 {
1367
1368 RESOLVE_TAG (&tag_unit, close->unit);
1369 RESOLVE_TAG (&tag_iomsg, close->iomsg);
1370 RESOLVE_TAG (&tag_iostat, close->iostat);
1371 RESOLVE_TAG (&tag_status, close->status);
1372
1373 if (gfc_reference_st_label (close->err, ST_LABEL_TARGET) == FAILURE)
1374 return FAILURE;
1375
1376 return SUCCESS;
1377 }
1378
1379
1380 /* Free a gfc_filepos structure. */
1381
1382 void
1383 gfc_free_filepos (gfc_filepos * fp)
1384 {
1385
1386 gfc_free_expr (fp->unit);
1387 gfc_free_expr (fp->iomsg);
1388 gfc_free_expr (fp->iostat);
1389 gfc_free (fp);
1390 }
1391
1392
1393 /* Match elements of a REWIND, BACKSPACE, ENDFILE, or FLUSH statement. */
1394
1395 static match
1396 match_file_element (gfc_filepos * fp)
1397 {
1398 match m;
1399
1400 m = match_etag (&tag_unit, &fp->unit);
1401 if (m != MATCH_NO)
1402 return m;
1403 m = match_out_tag (&tag_iomsg, &fp->iomsg);
1404 if (m != MATCH_NO)
1405 return m;
1406 m = match_out_tag (&tag_iostat, &fp->iostat);
1407 if (m != MATCH_NO)
1408 return m;
1409 m = match_ltag (&tag_err, &fp->err);
1410 if (m != MATCH_NO)
1411 return m;
1412
1413 return MATCH_NO;
1414 }
1415
1416
1417 /* Match the second half of the file-positioning statements, REWIND,
1418 BACKSPACE, ENDFILE, or the FLUSH statement. */
1419
1420 static match
1421 match_filepos (gfc_statement st, gfc_exec_op op)
1422 {
1423 gfc_filepos *fp;
1424 match m;
1425
1426 fp = gfc_getmem (sizeof (gfc_filepos));
1427
1428 if (gfc_match_char ('(') == MATCH_NO)
1429 {
1430 m = gfc_match_expr (&fp->unit);
1431 if (m == MATCH_ERROR)
1432 goto cleanup;
1433 if (m == MATCH_NO)
1434 goto syntax;
1435
1436 goto done;
1437 }
1438
1439 m = match_file_element (fp);
1440 if (m == MATCH_ERROR)
1441 goto done;
1442 if (m == MATCH_NO)
1443 {
1444 m = gfc_match_expr (&fp->unit);
1445 if (m == MATCH_ERROR)
1446 goto done;
1447 if (m == MATCH_NO)
1448 goto syntax;
1449 }
1450
1451 for (;;)
1452 {
1453 if (gfc_match_char (')') == MATCH_YES)
1454 break;
1455 if (gfc_match_char (',') != MATCH_YES)
1456 goto syntax;
1457
1458 m = match_file_element (fp);
1459 if (m == MATCH_ERROR)
1460 goto cleanup;
1461 if (m == MATCH_NO)
1462 goto syntax;
1463 }
1464
1465 done:
1466 if (gfc_match_eos () != MATCH_YES)
1467 goto syntax;
1468
1469 if (gfc_pure (NULL))
1470 {
1471 gfc_error ("%s statement not allowed in PURE procedure at %C",
1472 gfc_ascii_statement (st));
1473
1474 goto cleanup;
1475 }
1476
1477 new_st.op = op;
1478 new_st.ext.filepos = fp;
1479 return MATCH_YES;
1480
1481 syntax:
1482 gfc_syntax_error (st);
1483
1484 cleanup:
1485 gfc_free_filepos (fp);
1486 return MATCH_ERROR;
1487 }
1488
1489
1490 try
1491 gfc_resolve_filepos (gfc_filepos * fp)
1492 {
1493
1494 RESOLVE_TAG (&tag_unit, fp->unit);
1495 RESOLVE_TAG (&tag_iostat, fp->iostat);
1496 RESOLVE_TAG (&tag_iomsg, fp->iomsg);
1497 if (gfc_reference_st_label (fp->err, ST_LABEL_TARGET) == FAILURE)
1498 return FAILURE;
1499
1500 return SUCCESS;
1501 }
1502
1503
1504 /* Match the file positioning statements: ENDFILE, BACKSPACE, REWIND,
1505 and the FLUSH statement. */
1506
1507 match
1508 gfc_match_endfile (void)
1509 {
1510
1511 return match_filepos (ST_END_FILE, EXEC_ENDFILE);
1512 }
1513
1514 match
1515 gfc_match_backspace (void)
1516 {
1517
1518 return match_filepos (ST_BACKSPACE, EXEC_BACKSPACE);
1519 }
1520
1521 match
1522 gfc_match_rewind (void)
1523 {
1524
1525 return match_filepos (ST_REWIND, EXEC_REWIND);
1526 }
1527
1528 match
1529 gfc_match_flush (void)
1530 {
1531 if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: FLUSH statement at %C") == FAILURE)
1532 return MATCH_ERROR;
1533
1534 return match_filepos (ST_FLUSH, EXEC_FLUSH);
1535 }
1536
1537 /******************** Data Transfer Statements *********************/
1538
1539 typedef enum
1540 { M_READ, M_WRITE, M_PRINT, M_INQUIRE }
1541 io_kind;
1542
1543
1544 /* Return a default unit number. */
1545
1546 static gfc_expr *
1547 default_unit (io_kind k)
1548 {
1549 int unit;
1550
1551 if (k == M_READ)
1552 unit = 5;
1553 else
1554 unit = 6;
1555
1556 return gfc_int_expr (unit);
1557 }
1558
1559
1560 /* Match a unit specification for a data transfer statement. */
1561
1562 static match
1563 match_dt_unit (io_kind k, gfc_dt * dt)
1564 {
1565 gfc_expr *e;
1566
1567 if (gfc_match_char ('*') == MATCH_YES)
1568 {
1569 if (dt->io_unit != NULL)
1570 goto conflict;
1571
1572 dt->io_unit = default_unit (k);
1573 return MATCH_YES;
1574 }
1575
1576 if (gfc_match_expr (&e) == MATCH_YES)
1577 {
1578 if (dt->io_unit != NULL)
1579 {
1580 gfc_free_expr (e);
1581 goto conflict;
1582 }
1583
1584 dt->io_unit = e;
1585 return MATCH_YES;
1586 }
1587
1588 return MATCH_NO;
1589
1590 conflict:
1591 gfc_error ("Duplicate UNIT specification at %C");
1592 return MATCH_ERROR;
1593 }
1594
1595
1596 /* Match a format specification. */
1597
1598 static match
1599 match_dt_format (gfc_dt * dt)
1600 {
1601 locus where;
1602 gfc_expr *e;
1603 gfc_st_label *label;
1604
1605 where = gfc_current_locus;
1606
1607 if (gfc_match_char ('*') == MATCH_YES)
1608 {
1609 if (dt->format_expr != NULL || dt->format_label != NULL)
1610 goto conflict;
1611
1612 dt->format_label = &format_asterisk;
1613 return MATCH_YES;
1614 }
1615
1616 if (gfc_match_st_label (&label) == MATCH_YES)
1617 {
1618 if (dt->format_expr != NULL || dt->format_label != NULL)
1619 {
1620 gfc_free_st_label (label);
1621 goto conflict;
1622 }
1623
1624 if (gfc_reference_st_label (label, ST_LABEL_FORMAT) == FAILURE)
1625 return MATCH_ERROR;
1626
1627 dt->format_label = label;
1628 return MATCH_YES;
1629 }
1630
1631 if (gfc_match_expr (&e) == MATCH_YES)
1632 {
1633 if (dt->format_expr != NULL || dt->format_label != NULL)
1634 {
1635 gfc_free_expr (e);
1636 goto conflict;
1637 }
1638 dt->format_expr = e;
1639 return MATCH_YES;
1640 }
1641
1642 gfc_current_locus = where; /* The only case where we have to restore */
1643
1644 return MATCH_NO;
1645
1646 conflict:
1647 gfc_error ("Duplicate format specification at %C");
1648 return MATCH_ERROR;
1649 }
1650
1651
1652 /* Traverse a namelist that is part of a READ statement to make sure
1653 that none of the variables in the namelist are INTENT(IN). Returns
1654 nonzero if we find such a variable. */
1655
1656 static int
1657 check_namelist (gfc_symbol * sym)
1658 {
1659 gfc_namelist *p;
1660
1661 for (p = sym->namelist; p; p = p->next)
1662 if (p->sym->attr.intent == INTENT_IN)
1663 {
1664 gfc_error ("Symbol '%s' in namelist '%s' is INTENT(IN) at %C",
1665 p->sym->name, sym->name);
1666 return 1;
1667 }
1668
1669 return 0;
1670 }
1671
1672
1673 /* Match a single data transfer element. */
1674
1675 static match
1676 match_dt_element (io_kind k, gfc_dt * dt)
1677 {
1678 char name[GFC_MAX_SYMBOL_LEN + 1];
1679 gfc_symbol *sym;
1680 match m;
1681
1682 if (gfc_match (" unit =") == MATCH_YES)
1683 {
1684 m = match_dt_unit (k, dt);
1685 if (m != MATCH_NO)
1686 return m;
1687 }
1688
1689 if (gfc_match (" fmt =") == MATCH_YES)
1690 {
1691 m = match_dt_format (dt);
1692 if (m != MATCH_NO)
1693 return m;
1694 }
1695
1696 if (gfc_match (" nml = %n", name) == MATCH_YES)
1697 {
1698 if (dt->namelist != NULL)
1699 {
1700 gfc_error ("Duplicate NML specification at %C");
1701 return MATCH_ERROR;
1702 }
1703
1704 if (gfc_find_symbol (name, NULL, 1, &sym))
1705 return MATCH_ERROR;
1706
1707 if (sym == NULL || sym->attr.flavor != FL_NAMELIST)
1708 {
1709 gfc_error ("Symbol '%s' at %C must be a NAMELIST group name",
1710 sym != NULL ? sym->name : name);
1711 return MATCH_ERROR;
1712 }
1713
1714 dt->namelist = sym;
1715 if (k == M_READ && check_namelist (sym))
1716 return MATCH_ERROR;
1717
1718 return MATCH_YES;
1719 }
1720
1721 m = match_etag (&tag_rec, &dt->rec);
1722 if (m != MATCH_NO)
1723 return m;
1724 m = match_out_tag (&tag_iomsg, &dt->iomsg);
1725 if (m != MATCH_NO)
1726 return m;
1727 m = match_out_tag (&tag_iostat, &dt->iostat);
1728 if (m != MATCH_NO)
1729 return m;
1730 m = match_ltag (&tag_err, &dt->err);
1731 if (m != MATCH_NO)
1732 return m;
1733 m = match_etag (&tag_advance, &dt->advance);
1734 if (m != MATCH_NO)
1735 return m;
1736 m = match_out_tag (&tag_size, &dt->size);
1737 if (m != MATCH_NO)
1738 return m;
1739
1740 m = match_ltag (&tag_end, &dt->end);
1741 if (m == MATCH_YES)
1742 {
1743 if (k == M_WRITE)
1744 {
1745 gfc_error ("END tag at %C not allowed in output statement");
1746 return MATCH_ERROR;
1747 }
1748 dt->end_where = gfc_current_locus;
1749 }
1750 if (m != MATCH_NO)
1751 return m;
1752
1753 m = match_ltag (&tag_eor, &dt->eor);
1754 if (m == MATCH_YES)
1755 dt->eor_where = gfc_current_locus;
1756 if (m != MATCH_NO)
1757 return m;
1758
1759 return MATCH_NO;
1760 }
1761
1762
1763 /* Free a data transfer structure and everything below it. */
1764
1765 void
1766 gfc_free_dt (gfc_dt * dt)
1767 {
1768
1769 if (dt == NULL)
1770 return;
1771
1772 gfc_free_expr (dt->io_unit);
1773 gfc_free_expr (dt->format_expr);
1774 gfc_free_expr (dt->rec);
1775 gfc_free_expr (dt->advance);
1776 gfc_free_expr (dt->iomsg);
1777 gfc_free_expr (dt->iostat);
1778 gfc_free_expr (dt->size);
1779
1780 gfc_free (dt);
1781 }
1782
1783
1784 /* Resolve everything in a gfc_dt structure. */
1785
1786 try
1787 gfc_resolve_dt (gfc_dt * dt)
1788 {
1789 gfc_expr *e;
1790
1791 RESOLVE_TAG (&tag_format, dt->format_expr);
1792 RESOLVE_TAG (&tag_rec, dt->rec);
1793 RESOLVE_TAG (&tag_advance, dt->advance);
1794 RESOLVE_TAG (&tag_iomsg, dt->iomsg);
1795 RESOLVE_TAG (&tag_iostat, dt->iostat);
1796 RESOLVE_TAG (&tag_size, dt->size);
1797
1798 e = dt->io_unit;
1799 if (gfc_resolve_expr (e) == SUCCESS
1800 && (e->ts.type != BT_INTEGER
1801 && (e->ts.type != BT_CHARACTER
1802 || e->expr_type != EXPR_VARIABLE)))
1803 {
1804 gfc_error
1805 ("UNIT specification at %L must be an INTEGER expression or a "
1806 "CHARACTER variable", &e->where);
1807 return FAILURE;
1808 }
1809
1810 /* Sanity checks on data transfer statements. */
1811 if (e->ts.type == BT_CHARACTER)
1812 {
1813 if (gfc_has_vector_index (e))
1814 {
1815 gfc_error ("Internal unit with vector subscript at %L",
1816 &e->where);
1817 return FAILURE;
1818 }
1819
1820 if (dt->rec != NULL)
1821 {
1822 gfc_error ("REC tag at %L is incompatible with internal file",
1823 &dt->rec->where);
1824 return FAILURE;
1825 }
1826
1827 if (dt->namelist != NULL)
1828 {
1829 gfc_error ("Internal file at %L is incompatible with namelist",
1830 &dt->io_unit->where);
1831 return FAILURE;
1832 }
1833
1834 if (dt->advance != NULL)
1835 {
1836 gfc_error ("ADVANCE tag at %L is incompatible with internal file",
1837 &dt->advance->where);
1838 return FAILURE;
1839 }
1840 }
1841
1842 if (dt->rec != NULL)
1843 {
1844 if (dt->end != NULL)
1845 {
1846 gfc_error ("REC tag at %L is incompatible with END tag",
1847 &dt->rec->where);
1848 return FAILURE;
1849 }
1850
1851 if (dt->format_label == &format_asterisk)
1852 {
1853 gfc_error
1854 ("END tag at %L is incompatible with list directed format (*)",
1855 &dt->end_where);
1856 return FAILURE;
1857 }
1858
1859 if (dt->namelist != NULL)
1860 {
1861 gfc_error ("REC tag at %L is incompatible with namelist",
1862 &dt->rec->where);
1863 return FAILURE;
1864 }
1865 }
1866
1867 if (dt->advance != NULL && dt->format_label == &format_asterisk)
1868 {
1869 gfc_error ("ADVANCE tag at %L is incompatible with list directed "
1870 "format (*)", &dt->advance->where);
1871 return FAILURE;
1872 }
1873
1874 if (dt->eor != 0 && dt->advance == NULL)
1875 {
1876 gfc_error ("EOR tag at %L requires an ADVANCE tag", &dt->eor_where);
1877 return FAILURE;
1878 }
1879
1880 if (dt->size != NULL && dt->advance == NULL)
1881 {
1882 gfc_error ("SIZE tag at %L requires an ADVANCE tag", &dt->size->where);
1883 return FAILURE;
1884 }
1885
1886 /* TODO: Make sure the ADVANCE tag is 'yes' or 'no' if it is a string
1887 constant. */
1888
1889 if (gfc_reference_st_label (dt->err, ST_LABEL_TARGET) == FAILURE)
1890 return FAILURE;
1891
1892 if (gfc_reference_st_label (dt->end, ST_LABEL_TARGET) == FAILURE)
1893 return FAILURE;
1894
1895 if (gfc_reference_st_label (dt->eor, ST_LABEL_TARGET) == FAILURE)
1896 return FAILURE;
1897
1898 /* Check the format label actually exists. */
1899 if (dt->format_label && dt->format_label != &format_asterisk
1900 && dt->format_label->defined == ST_LABEL_UNKNOWN)
1901 {
1902 gfc_error ("FORMAT label %d at %L not defined", dt->format_label->value,
1903 &dt->format_label->where);
1904 return FAILURE;
1905 }
1906 return SUCCESS;
1907 }
1908
1909
1910 /* Given an io_kind, return its name. */
1911
1912 static const char *
1913 io_kind_name (io_kind k)
1914 {
1915 const char *name;
1916
1917 switch (k)
1918 {
1919 case M_READ:
1920 name = "READ";
1921 break;
1922 case M_WRITE:
1923 name = "WRITE";
1924 break;
1925 case M_PRINT:
1926 name = "PRINT";
1927 break;
1928 case M_INQUIRE:
1929 name = "INQUIRE";
1930 break;
1931 default:
1932 gfc_internal_error ("io_kind_name(): bad I/O-kind");
1933 }
1934
1935 return name;
1936 }
1937
1938
1939 /* Match an IO iteration statement of the form:
1940
1941 ( [<IO element> ,] <IO element>, I = <expr>, <expr> [, <expr> ] )
1942
1943 which is equivalent to a single IO element. This function is
1944 mutually recursive with match_io_element(). */
1945
1946 static match match_io_element (io_kind k, gfc_code **);
1947
1948 static match
1949 match_io_iterator (io_kind k, gfc_code ** result)
1950 {
1951 gfc_code *head, *tail, *new;
1952 gfc_iterator *iter;
1953 locus old_loc;
1954 match m;
1955 int n;
1956
1957 iter = NULL;
1958 head = NULL;
1959 old_loc = gfc_current_locus;
1960
1961 if (gfc_match_char ('(') != MATCH_YES)
1962 return MATCH_NO;
1963
1964 m = match_io_element (k, &head);
1965 tail = head;
1966
1967 if (m != MATCH_YES || gfc_match_char (',') != MATCH_YES)
1968 {
1969 m = MATCH_NO;
1970 goto cleanup;
1971 }
1972
1973 /* Can't be anything but an IO iterator. Build a list. */
1974 iter = gfc_get_iterator ();
1975
1976 for (n = 1;; n++)
1977 {
1978 m = gfc_match_iterator (iter, 0);
1979 if (m == MATCH_ERROR)
1980 goto cleanup;
1981 if (m == MATCH_YES)
1982 {
1983 gfc_check_do_variable (iter->var->symtree);
1984 break;
1985 }
1986
1987 m = match_io_element (k, &new);
1988 if (m == MATCH_ERROR)
1989 goto cleanup;
1990 if (m == MATCH_NO)
1991 {
1992 if (n > 2)
1993 goto syntax;
1994 goto cleanup;
1995 }
1996
1997 tail = gfc_append_code (tail, new);
1998
1999 if (gfc_match_char (',') != MATCH_YES)
2000 {
2001 if (n > 2)
2002 goto syntax;
2003 m = MATCH_NO;
2004 goto cleanup;
2005 }
2006 }
2007
2008 if (gfc_match_char (')') != MATCH_YES)
2009 goto syntax;
2010
2011 new = gfc_get_code ();
2012 new->op = EXEC_DO;
2013 new->ext.iterator = iter;
2014
2015 new->block = gfc_get_code ();
2016 new->block->op = EXEC_DO;
2017 new->block->next = head;
2018
2019 *result = new;
2020 return MATCH_YES;
2021
2022 syntax:
2023 gfc_error ("Syntax error in I/O iterator at %C");
2024 m = MATCH_ERROR;
2025
2026 cleanup:
2027 gfc_free_iterator (iter, 1);
2028 gfc_free_statements (head);
2029 gfc_current_locus = old_loc;
2030 return m;
2031 }
2032
2033
2034 /* Match a single element of an IO list, which is either a single
2035 expression or an IO Iterator. */
2036
2037 static match
2038 match_io_element (io_kind k, gfc_code ** cpp)
2039 {
2040 gfc_expr *expr;
2041 gfc_code *cp;
2042 match m;
2043
2044 expr = NULL;
2045
2046 m = match_io_iterator (k, cpp);
2047 if (m == MATCH_YES)
2048 return MATCH_YES;
2049
2050 if (k == M_READ)
2051 {
2052 m = gfc_match_variable (&expr, 0);
2053 if (m == MATCH_NO)
2054 gfc_error ("Expected variable in READ statement at %C");
2055 }
2056 else
2057 {
2058 m = gfc_match_expr (&expr);
2059 if (m == MATCH_NO)
2060 gfc_error ("Expected expression in %s statement at %C",
2061 io_kind_name (k));
2062 }
2063
2064 if (m == MATCH_YES)
2065 switch (k)
2066 {
2067 case M_READ:
2068 if (expr->symtree->n.sym->attr.intent == INTENT_IN)
2069 {
2070 gfc_error
2071 ("Variable '%s' in input list at %C cannot be INTENT(IN)",
2072 expr->symtree->n.sym->name);
2073 m = MATCH_ERROR;
2074 }
2075
2076 if (gfc_pure (NULL)
2077 && gfc_impure_variable (expr->symtree->n.sym)
2078 && current_dt->io_unit->ts.type == BT_CHARACTER)
2079 {
2080 gfc_error ("Cannot read to variable '%s' in PURE procedure at %C",
2081 expr->symtree->n.sym->name);
2082 m = MATCH_ERROR;
2083 }
2084
2085 if (gfc_check_do_variable (expr->symtree))
2086 m = MATCH_ERROR;
2087
2088 break;
2089
2090 case M_WRITE:
2091 if (current_dt->io_unit->ts.type == BT_CHARACTER
2092 && gfc_pure (NULL)
2093 && current_dt->io_unit->expr_type == EXPR_VARIABLE
2094 && gfc_impure_variable (current_dt->io_unit->symtree->n.sym))
2095 {
2096 gfc_error
2097 ("Cannot write to internal file unit '%s' at %C inside a "
2098 "PURE procedure", current_dt->io_unit->symtree->n.sym->name);
2099 m = MATCH_ERROR;
2100 }
2101
2102 break;
2103
2104 default:
2105 break;
2106 }
2107
2108 if (m != MATCH_YES)
2109 {
2110 gfc_free_expr (expr);
2111 return MATCH_ERROR;
2112 }
2113
2114 cp = gfc_get_code ();
2115 cp->op = EXEC_TRANSFER;
2116 cp->expr = expr;
2117
2118 *cpp = cp;
2119 return MATCH_YES;
2120 }
2121
2122
2123 /* Match an I/O list, building gfc_code structures as we go. */
2124
2125 static match
2126 match_io_list (io_kind k, gfc_code ** head_p)
2127 {
2128 gfc_code *head, *tail, *new;
2129 match m;
2130
2131 *head_p = head = tail = NULL;
2132 if (gfc_match_eos () == MATCH_YES)
2133 return MATCH_YES;
2134
2135 for (;;)
2136 {
2137 m = match_io_element (k, &new);
2138 if (m == MATCH_ERROR)
2139 goto cleanup;
2140 if (m == MATCH_NO)
2141 goto syntax;
2142
2143 tail = gfc_append_code (tail, new);
2144 if (head == NULL)
2145 head = new;
2146
2147 if (gfc_match_eos () == MATCH_YES)
2148 break;
2149 if (gfc_match_char (',') != MATCH_YES)
2150 goto syntax;
2151 }
2152
2153 *head_p = head;
2154 return MATCH_YES;
2155
2156 syntax:
2157 gfc_error ("Syntax error in %s statement at %C", io_kind_name (k));
2158
2159 cleanup:
2160 gfc_free_statements (head);
2161 return MATCH_ERROR;
2162 }
2163
2164
2165 /* Attach the data transfer end node. */
2166
2167 static void
2168 terminate_io (gfc_code * io_code)
2169 {
2170 gfc_code *c;
2171
2172 if (io_code == NULL)
2173 io_code = new_st.block;
2174
2175 c = gfc_get_code ();
2176 c->op = EXEC_DT_END;
2177
2178 /* Point to structure that is already there */
2179 c->ext.dt = new_st.ext.dt;
2180 gfc_append_code (io_code, c);
2181 }
2182
2183
2184 /* Match a READ, WRITE or PRINT statement. */
2185
2186 static match
2187 match_io (io_kind k)
2188 {
2189 char name[GFC_MAX_SYMBOL_LEN + 1];
2190 gfc_code *io_code;
2191 gfc_symbol *sym;
2192 gfc_expr *expr;
2193 int comma_flag, c;
2194 locus where;
2195 gfc_dt *dt;
2196 match m;
2197
2198 comma_flag = 0;
2199 current_dt = dt = gfc_getmem (sizeof (gfc_dt));
2200 if (gfc_match_char ('(') == MATCH_NO)
2201 {
2202 where = gfc_current_locus;
2203 if (k == M_WRITE)
2204 goto syntax;
2205 else if (k == M_PRINT)
2206 {
2207 /* Treat the non-standard case of PRINT namelist. */
2208 if ((gfc_current_form == FORM_FIXED || gfc_peek_char () == ' ')
2209 && gfc_match_name (name) == MATCH_YES)
2210 {
2211 gfc_find_symbol (name, NULL, 1, &sym);
2212 if (sym && sym->attr.flavor == FL_NAMELIST)
2213 {
2214 if (gfc_notify_std (GFC_STD_GNU, "PRINT namelist at "
2215 "%C is an extension") == FAILURE)
2216 {
2217 m = MATCH_ERROR;
2218 goto cleanup;
2219 }
2220 if (gfc_match_eos () == MATCH_NO)
2221 {
2222 gfc_error ("Namelist followed by I/O list at %C");
2223 m = MATCH_ERROR;
2224 goto cleanup;
2225 }
2226
2227 dt->io_unit = default_unit (k);
2228 dt->namelist = sym;
2229 goto get_io_list;
2230 }
2231 else
2232 gfc_current_locus = where;
2233 }
2234 }
2235
2236 if (gfc_current_form == FORM_FREE)
2237 {
2238 c = gfc_peek_char();
2239 if (c != ' ' && c != '*' && c != '\'' && c != '"')
2240 {
2241 m = MATCH_NO;
2242 goto cleanup;
2243 }
2244 }
2245
2246 m = match_dt_format (dt);
2247 if (m == MATCH_ERROR)
2248 goto cleanup;
2249 if (m == MATCH_NO)
2250 goto syntax;
2251
2252 comma_flag = 1;
2253 dt->io_unit = default_unit (k);
2254 goto get_io_list;
2255 }
2256
2257 /* Match a control list */
2258 if (match_dt_element (k, dt) == MATCH_YES)
2259 goto next;
2260 if (match_dt_unit (k, dt) != MATCH_YES)
2261 goto loop;
2262
2263 if (gfc_match_char (')') == MATCH_YES)
2264 goto get_io_list;
2265 if (gfc_match_char (',') != MATCH_YES)
2266 goto syntax;
2267
2268 m = match_dt_element (k, dt);
2269 if (m == MATCH_YES)
2270 goto next;
2271 if (m == MATCH_ERROR)
2272 goto cleanup;
2273
2274 m = match_dt_format (dt);
2275 if (m == MATCH_YES)
2276 goto next;
2277 if (m == MATCH_ERROR)
2278 goto cleanup;
2279
2280 where = gfc_current_locus;
2281
2282 m = gfc_match_name (name);
2283 if (m == MATCH_YES)
2284 {
2285 gfc_find_symbol (name, NULL, 1, &sym);
2286 if (sym && sym->attr.flavor == FL_NAMELIST)
2287 {
2288 dt->namelist = sym;
2289 if (k == M_READ && check_namelist (sym))
2290 {
2291 m = MATCH_ERROR;
2292 goto cleanup;
2293 }
2294 goto next;
2295 }
2296 }
2297
2298 gfc_current_locus = where;
2299
2300 goto loop; /* No matches, try regular elements */
2301
2302 next:
2303 if (gfc_match_char (')') == MATCH_YES)
2304 goto get_io_list;
2305 if (gfc_match_char (',') != MATCH_YES)
2306 goto syntax;
2307
2308 loop:
2309 for (;;)
2310 {
2311 m = match_dt_element (k, dt);
2312 if (m == MATCH_NO)
2313 goto syntax;
2314 if (m == MATCH_ERROR)
2315 goto cleanup;
2316
2317 if (gfc_match_char (')') == MATCH_YES)
2318 break;
2319 if (gfc_match_char (',') != MATCH_YES)
2320 goto syntax;
2321 }
2322
2323 get_io_list:
2324 /* Optional leading comma (non-standard). */
2325 if (!comma_flag
2326 && gfc_match_char (',') == MATCH_YES
2327 && k == M_WRITE
2328 && gfc_notify_std (GFC_STD_GNU, "Extension: Comma before output "
2329 "item list at %C is an extension") == FAILURE)
2330 return MATCH_ERROR;
2331
2332 io_code = NULL;
2333 if (gfc_match_eos () != MATCH_YES)
2334 {
2335 if (comma_flag && gfc_match_char (',') != MATCH_YES)
2336 {
2337 gfc_error ("Expected comma in I/O list at %C");
2338 m = MATCH_ERROR;
2339 goto cleanup;
2340 }
2341
2342 m = match_io_list (k, &io_code);
2343 if (m == MATCH_ERROR)
2344 goto cleanup;
2345 if (m == MATCH_NO)
2346 goto syntax;
2347 }
2348
2349 /* A full IO statement has been matched. */
2350 if (dt->io_unit->expr_type == EXPR_VARIABLE
2351 && k == M_WRITE
2352 && dt->io_unit->ts.type == BT_CHARACTER
2353 && dt->io_unit->symtree->n.sym->attr.intent == INTENT_IN)
2354 {
2355 gfc_error ("Internal file '%s' at %L is INTENT(IN)",
2356 dt->io_unit->symtree->n.sym->name, &dt->io_unit->where);
2357 m = MATCH_ERROR;
2358 goto cleanup;
2359 }
2360
2361 expr = dt->format_expr;
2362
2363 if (expr != NULL && expr->expr_type == EXPR_CONSTANT)
2364 check_format_string (expr);
2365
2366 if (gfc_pure (NULL)
2367 && (k == M_READ || k == M_WRITE)
2368 && dt->io_unit->ts.type != BT_CHARACTER)
2369 {
2370 gfc_error
2371 ("io-unit in %s statement at %C must be an internal file in a "
2372 "PURE procedure", io_kind_name (k));
2373 m = MATCH_ERROR;
2374 goto cleanup;
2375 }
2376
2377 new_st.op = (k == M_READ) ? EXEC_READ : EXEC_WRITE;
2378 new_st.ext.dt = dt;
2379 new_st.block = gfc_get_code ();
2380 new_st.block->op = new_st.op;
2381 new_st.block->next = io_code;
2382
2383 terminate_io (io_code);
2384
2385 return MATCH_YES;
2386
2387 syntax:
2388 gfc_error ("Syntax error in %s statement at %C", io_kind_name (k));
2389 m = MATCH_ERROR;
2390
2391 cleanup:
2392 gfc_free_dt (dt);
2393 return m;
2394 }
2395
2396
2397 match
2398 gfc_match_read (void)
2399 {
2400 return match_io (M_READ);
2401 }
2402
2403 match
2404 gfc_match_write (void)
2405 {
2406 return match_io (M_WRITE);
2407 }
2408
2409 match
2410 gfc_match_print (void)
2411 {
2412 match m;
2413
2414 m = match_io (M_PRINT);
2415 if (m != MATCH_YES)
2416 return m;
2417
2418 if (gfc_pure (NULL))
2419 {
2420 gfc_error ("PRINT statement at %C not allowed within PURE procedure");
2421 return MATCH_ERROR;
2422 }
2423
2424 return MATCH_YES;
2425 }
2426
2427
2428 /* Free a gfc_inquire structure. */
2429
2430 void
2431 gfc_free_inquire (gfc_inquire * inquire)
2432 {
2433
2434 if (inquire == NULL)
2435 return;
2436
2437 gfc_free_expr (inquire->unit);
2438 gfc_free_expr (inquire->file);
2439 gfc_free_expr (inquire->iomsg);
2440 gfc_free_expr (inquire->iostat);
2441 gfc_free_expr (inquire->exist);
2442 gfc_free_expr (inquire->opened);
2443 gfc_free_expr (inquire->number);
2444 gfc_free_expr (inquire->named);
2445 gfc_free_expr (inquire->name);
2446 gfc_free_expr (inquire->access);
2447 gfc_free_expr (inquire->sequential);
2448 gfc_free_expr (inquire->direct);
2449 gfc_free_expr (inquire->form);
2450 gfc_free_expr (inquire->formatted);
2451 gfc_free_expr (inquire->unformatted);
2452 gfc_free_expr (inquire->recl);
2453 gfc_free_expr (inquire->nextrec);
2454 gfc_free_expr (inquire->blank);
2455 gfc_free_expr (inquire->position);
2456 gfc_free_expr (inquire->action);
2457 gfc_free_expr (inquire->read);
2458 gfc_free_expr (inquire->write);
2459 gfc_free_expr (inquire->readwrite);
2460 gfc_free_expr (inquire->delim);
2461 gfc_free_expr (inquire->pad);
2462 gfc_free_expr (inquire->iolength);
2463 gfc_free_expr (inquire->convert);
2464
2465 gfc_free (inquire);
2466 }
2467
2468
2469 /* Match an element of an INQUIRE statement. */
2470
2471 #define RETM if (m != MATCH_NO) return m;
2472
2473 static match
2474 match_inquire_element (gfc_inquire * inquire)
2475 {
2476 match m;
2477
2478 m = match_etag (&tag_unit, &inquire->unit);
2479 RETM m = match_etag (&tag_file, &inquire->file);
2480 RETM m = match_ltag (&tag_err, &inquire->err);
2481 RETM m = match_out_tag (&tag_iomsg, &inquire->iomsg);
2482 RETM m = match_out_tag (&tag_iostat, &inquire->iostat);
2483 RETM m = match_vtag (&tag_exist, &inquire->exist);
2484 RETM m = match_vtag (&tag_opened, &inquire->opened);
2485 RETM m = match_vtag (&tag_named, &inquire->named);
2486 RETM m = match_vtag (&tag_name, &inquire->name);
2487 RETM m = match_out_tag (&tag_number, &inquire->number);
2488 RETM m = match_vtag (&tag_s_access, &inquire->access);
2489 RETM m = match_vtag (&tag_sequential, &inquire->sequential);
2490 RETM m = match_vtag (&tag_direct, &inquire->direct);
2491 RETM m = match_vtag (&tag_s_form, &inquire->form);
2492 RETM m = match_vtag (&tag_formatted, &inquire->formatted);
2493 RETM m = match_vtag (&tag_unformatted, &inquire->unformatted);
2494 RETM m = match_out_tag (&tag_s_recl, &inquire->recl);
2495 RETM m = match_out_tag (&tag_nextrec, &inquire->nextrec);
2496 RETM m = match_vtag (&tag_s_blank, &inquire->blank);
2497 RETM m = match_vtag (&tag_s_position, &inquire->position);
2498 RETM m = match_vtag (&tag_s_action, &inquire->action);
2499 RETM m = match_vtag (&tag_read, &inquire->read);
2500 RETM m = match_vtag (&tag_write, &inquire->write);
2501 RETM m = match_vtag (&tag_readwrite, &inquire->readwrite);
2502 RETM m = match_vtag (&tag_s_delim, &inquire->delim);
2503 RETM m = match_vtag (&tag_s_pad, &inquire->pad);
2504 RETM m = match_vtag (&tag_iolength, &inquire->iolength);
2505 RETM m = match_vtag (&tag_convert, &inquire->convert);
2506 RETM return MATCH_NO;
2507 }
2508
2509 #undef RETM
2510
2511
2512 match
2513 gfc_match_inquire (void)
2514 {
2515 gfc_inquire *inquire;
2516 gfc_code *code;
2517 match m;
2518 locus loc;
2519
2520 m = gfc_match_char ('(');
2521 if (m == MATCH_NO)
2522 return m;
2523
2524 inquire = gfc_getmem (sizeof (gfc_inquire));
2525
2526 loc = gfc_current_locus;
2527
2528 m = match_inquire_element (inquire);
2529 if (m == MATCH_ERROR)
2530 goto cleanup;
2531 if (m == MATCH_NO)
2532 {
2533 m = gfc_match_expr (&inquire->unit);
2534 if (m == MATCH_ERROR)
2535 goto cleanup;
2536 if (m == MATCH_NO)
2537 goto syntax;
2538 }
2539
2540 /* See if we have the IOLENGTH form of the inquire statement. */
2541 if (inquire->iolength != NULL)
2542 {
2543 if (gfc_match_char (')') != MATCH_YES)
2544 goto syntax;
2545
2546 m = match_io_list (M_INQUIRE, &code);
2547 if (m == MATCH_ERROR)
2548 goto cleanup;
2549 if (m == MATCH_NO)
2550 goto syntax;
2551
2552 new_st.op = EXEC_IOLENGTH;
2553 new_st.expr = inquire->iolength;
2554 new_st.ext.inquire = inquire;
2555
2556 if (gfc_pure (NULL))
2557 {
2558 gfc_free_statements (code);
2559 gfc_error ("INQUIRE statement not allowed in PURE procedure at %C");
2560 return MATCH_ERROR;
2561 }
2562
2563 new_st.block = gfc_get_code ();
2564 new_st.block->op = EXEC_IOLENGTH;
2565 terminate_io (code);
2566 new_st.block->next = code;
2567 return MATCH_YES;
2568 }
2569
2570 /* At this point, we have the non-IOLENGTH inquire statement. */
2571 for (;;)
2572 {
2573 if (gfc_match_char (')') == MATCH_YES)
2574 break;
2575 if (gfc_match_char (',') != MATCH_YES)
2576 goto syntax;
2577
2578 m = match_inquire_element (inquire);
2579 if (m == MATCH_ERROR)
2580 goto cleanup;
2581 if (m == MATCH_NO)
2582 goto syntax;
2583
2584 if (inquire->iolength != NULL)
2585 {
2586 gfc_error ("IOLENGTH tag invalid in INQUIRE statement at %C");
2587 goto cleanup;
2588 }
2589 }
2590
2591 if (gfc_match_eos () != MATCH_YES)
2592 goto syntax;
2593
2594 if (inquire->unit != NULL && inquire->file != NULL)
2595 {
2596 gfc_error ("INQUIRE statement at %L cannot contain both FILE and"
2597 " UNIT specifiers", &loc);
2598 goto cleanup;
2599 }
2600
2601 if (inquire->unit == NULL && inquire->file == NULL)
2602 {
2603 gfc_error ("INQUIRE statement at %L requires either FILE or"
2604 " UNIT specifier", &loc);
2605 goto cleanup;
2606 }
2607
2608 if (gfc_pure (NULL))
2609 {
2610 gfc_error ("INQUIRE statement not allowed in PURE procedure at %C");
2611 goto cleanup;
2612 }
2613
2614 new_st.op = EXEC_INQUIRE;
2615 new_st.ext.inquire = inquire;
2616 return MATCH_YES;
2617
2618 syntax:
2619 gfc_syntax_error (ST_INQUIRE);
2620
2621 cleanup:
2622 gfc_free_inquire (inquire);
2623 return MATCH_ERROR;
2624 }
2625
2626
2627 /* Resolve everything in a gfc_inquire structure. */
2628
2629 try
2630 gfc_resolve_inquire (gfc_inquire * inquire)
2631 {
2632
2633 RESOLVE_TAG (&tag_unit, inquire->unit);
2634 RESOLVE_TAG (&tag_file, inquire->file);
2635 RESOLVE_TAG (&tag_iomsg, inquire->iomsg);
2636 RESOLVE_TAG (&tag_iostat, inquire->iostat);
2637 RESOLVE_TAG (&tag_exist, inquire->exist);
2638 RESOLVE_TAG (&tag_opened, inquire->opened);
2639 RESOLVE_TAG (&tag_number, inquire->number);
2640 RESOLVE_TAG (&tag_named, inquire->named);
2641 RESOLVE_TAG (&tag_name, inquire->name);
2642 RESOLVE_TAG (&tag_s_access, inquire->access);
2643 RESOLVE_TAG (&tag_sequential, inquire->sequential);
2644 RESOLVE_TAG (&tag_direct, inquire->direct);
2645 RESOLVE_TAG (&tag_s_form, inquire->form);
2646 RESOLVE_TAG (&tag_formatted, inquire->formatted);
2647 RESOLVE_TAG (&tag_unformatted, inquire->unformatted);
2648 RESOLVE_TAG (&tag_s_recl, inquire->recl);
2649 RESOLVE_TAG (&tag_nextrec, inquire->nextrec);
2650 RESOLVE_TAG (&tag_s_blank, inquire->blank);
2651 RESOLVE_TAG (&tag_s_position, inquire->position);
2652 RESOLVE_TAG (&tag_s_action, inquire->action);
2653 RESOLVE_TAG (&tag_read, inquire->read);
2654 RESOLVE_TAG (&tag_write, inquire->write);
2655 RESOLVE_TAG (&tag_readwrite, inquire->readwrite);
2656 RESOLVE_TAG (&tag_s_delim, inquire->delim);
2657 RESOLVE_TAG (&tag_s_pad, inquire->pad);
2658 RESOLVE_TAG (&tag_iolength, inquire->iolength);
2659 RESOLVE_TAG (&tag_convert, inquire->convert);
2660
2661 if (gfc_reference_st_label (inquire->err, ST_LABEL_TARGET) == FAILURE)
2662 return FAILURE;
2663
2664 return SUCCESS;
2665 }
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