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[official-gcc.git] / gomp-20050608-branch / gcc / fortran / io.c
blob618d056ce79c9dc610ce85c5c219af555bdc6632
1 /* Deal with I/O statements & related stuff.
2 Copyright (C) 2000, 2001, 2002, 2003, 2004, 2005, 2006 Free Software
3 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 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 {0, NULL, NULL, -1, ST_LABEL_FORMAT, ST_LABEL_FORMAT, NULL,
32 0, {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 /* Eat up the spaces and return a character. */
158
159 static char
160 next_char_not_space(void)
161 {
162 char c;
163 do
164 {
165 c = next_char (0);
166 }
167 while (gfc_is_whitespace (c));
168 return c;
169 }
170
171 static int value = 0;
172
173 /* Simple lexical analyzer for getting the next token in a FORMAT
174 statement. */
175
176 static format_token
177 format_lex (void)
178 {
179 format_token token;
180 char c, delim;
181 int zflag;
182 int negative_flag;
183
184 if (saved_token != FMT_NONE)
185 {
186 token = saved_token;
187 saved_token = FMT_NONE;
188 return token;
189 }
190
191 c = next_char_not_space ();
192
193 negative_flag = 0;
194 switch (c)
195 {
196 case '-':
197 negative_flag = 1;
198 case '+':
199 c = next_char_not_space ();
200 if (!ISDIGIT (c))
201 {
202 token = FMT_UNKNOWN;
203 break;
204 }
205
206 value = c - '0';
207
208 do
209 {
210 c = next_char_not_space ();
211 if(ISDIGIT (c))
212 value = 10 * value + c - '0';
213 }
214 while (ISDIGIT (c));
215
216 unget_char ();
217
218 if (negative_flag)
219 value = -value;
220
221 token = FMT_SIGNED_INT;
222 break;
223
224 case '0':
225 case '1':
226 case '2':
227 case '3':
228 case '4':
229 case '5':
230 case '6':
231 case '7':
232 case '8':
233 case '9':
234 zflag = (c == '0');
235
236 value = c - '0';
237
238 do
239 {
240 c = next_char_not_space ();
241 if (c != '0')
242 zflag = 0;
243 if (ISDIGIT (c))
244 value = 10 * value + c - '0';
245 }
246 while (ISDIGIT (c));
247
248 unget_char ();
249 token = zflag ? FMT_ZERO : FMT_POSINT;
250 break;
251
252 case '.':
253 token = FMT_PERIOD;
254 break;
255
256 case ',':
257 token = FMT_COMMA;
258 break;
259
260 case ':':
261 token = FMT_COLON;
262 break;
263
264 case '/':
265 token = FMT_SLASH;
266 break;
267
268 case '$':
269 token = FMT_DOLLAR;
270 break;
271
272 case 'T':
273 c = next_char_not_space ();
274 if (c != 'L' && c != 'R')
275 unget_char ();
276
277 token = FMT_POS;
278 break;
279
280 case '(':
281 token = FMT_LPAREN;
282 break;
283
284 case ')':
285 token = FMT_RPAREN;
286 break;
287
288 case 'X':
289 token = FMT_X;
290 break;
291
292 case 'S':
293 c = next_char_not_space ();
294 if (c != 'P' && c != 'S')
295 unget_char ();
296
297 token = FMT_SIGN;
298 break;
299
300 case 'B':
301 c = next_char_not_space ();
302 if (c == 'N' || c == 'Z')
303 token = FMT_BLANK;
304 else
305 {
306 unget_char ();
307 token = FMT_IBOZ;
308 }
309
310 break;
311
312 case '\'':
313 case '"':
314 delim = c;
315
316 value = 0;
317
318 for (;;)
319 {
320 c = next_char (1);
321 if (c == '\0')
322 {
323 token = FMT_END;
324 break;
325 }
326
327 if (c == delim)
328 {
329 c = next_char (1);
330
331 if (c == '\0')
332 {
333 token = FMT_END;
334 break;
335 }
336
337 if (c != delim)
338 {
339 unget_char ();
340 token = FMT_CHAR;
341 break;
342 }
343 }
344 value++;
345 }
346 break;
347
348 case 'P':
349 token = FMT_P;
350 break;
351
352 case 'I':
353 case 'O':
354 case 'Z':
355 token = FMT_IBOZ;
356 break;
357
358 case 'F':
359 token = FMT_F;
360 break;
361
362 case 'E':
363 c = next_char_not_space ();
364 if (c == 'N' || c == 'S')
365 token = FMT_EXT;
366 else
367 {
368 token = FMT_E;
369 unget_char ();
370 }
371
372 break;
373
374 case 'G':
375 token = FMT_G;
376 break;
377
378 case 'H':
379 token = FMT_H;
380 break;
381
382 case 'L':
383 token = FMT_L;
384 break;
385
386 case 'A':
387 token = FMT_A;
388 break;
389
390 case 'D':
391 token = FMT_D;
392 break;
393
394 case '\0':
395 token = FMT_END;
396 break;
397
398 default:
399 token = FMT_UNKNOWN;
400 break;
401 }
402
403 return token;
404 }
405
406
407 /* Check a format statement. The format string, either from a FORMAT
408 statement or a constant in an I/O statement has already been parsed
409 by itself, and we are checking it for validity. The dual origin
410 means that the warning message is a little less than great. */
411
412 static try
413 check_format (void)
414 {
415 const char *posint_required = _("Positive width required");
416 const char *period_required = _("Period required");
417 const char *nonneg_required = _("Nonnegative width required");
418 const char *unexpected_element = _("Unexpected element");
419 const char *unexpected_end = _("Unexpected end of format string");
420
421 const char *error;
422 format_token t, u;
423 int level;
424 int repeat;
425 try rv;
426
427 use_last_char = 0;
428 saved_token = FMT_NONE;
429 level = 0;
430 repeat = 0;
431 rv = SUCCESS;
432
433 t = format_lex ();
434 if (t != FMT_LPAREN)
435 {
436 error = _("Missing leading left parenthesis");
437 goto syntax;
438 }
439
440 t = format_lex ();
441 if (t == FMT_RPAREN)
442 goto finished; /* Empty format is legal */
443 saved_token = t;
444
445 format_item:
446 /* In this state, the next thing has to be a format item. */
447 t = format_lex ();
448 format_item_1:
449 switch (t)
450 {
451 case FMT_POSINT:
452 repeat = value;
453 t = format_lex ();
454 if (t == FMT_LPAREN)
455 {
456 level++;
457 goto format_item;
458 }
459
460 if (t == FMT_SLASH)
461 goto optional_comma;
462
463 goto data_desc;
464
465 case FMT_LPAREN:
466 level++;
467 goto format_item;
468
469 case FMT_SIGNED_INT:
470 /* Signed integer can only precede a P format. */
471 t = format_lex ();
472 if (t != FMT_P)
473 {
474 error = _("Expected P edit descriptor");
475 goto syntax;
476 }
477
478 goto data_desc;
479
480 case FMT_P:
481 /* P requires a prior number. */
482 error = _("P descriptor requires leading scale factor");
483 goto syntax;
484
485 case FMT_X:
486 /* X requires a prior number if we're being pedantic. */
487 if (gfc_notify_std (GFC_STD_GNU, "Extension: X descriptor "
488 "requires leading space count at %C")
489 == FAILURE)
490 return FAILURE;
491 goto between_desc;
492
493 case FMT_SIGN:
494 case FMT_BLANK:
495 goto between_desc;
496
497 case FMT_CHAR:
498 goto extension_optional_comma;
499
500 case FMT_COLON:
501 case FMT_SLASH:
502 goto optional_comma;
503
504 case FMT_DOLLAR:
505 t = format_lex ();
506
507 if (gfc_notify_std (GFC_STD_GNU, "Extension: $ descriptor at %C")
508 == FAILURE)
509 return FAILURE;
510 if (t != FMT_RPAREN || level > 0)
511 {
512 error = _("$ must be the last specifier");
513 goto syntax;
514 }
515
516 goto finished;
517
518 case FMT_POS:
519 case FMT_IBOZ:
520 case FMT_F:
521 case FMT_E:
522 case FMT_EXT:
523 case FMT_G:
524 case FMT_L:
525 case FMT_A:
526 case FMT_D:
527 goto data_desc;
528
529 case FMT_H:
530 goto data_desc;
531
532 case FMT_END:
533 error = unexpected_end;
534 goto syntax;
535
536 default:
537 error = unexpected_element;
538 goto syntax;
539 }
540
541 data_desc:
542 /* In this state, t must currently be a data descriptor.
543 Deal with things that can/must follow the descriptor. */
544 switch (t)
545 {
546 case FMT_SIGN:
547 case FMT_BLANK:
548 case FMT_X:
549 break;
550
551 case FMT_P:
552 if (pedantic)
553 {
554 t = format_lex ();
555 if (t == FMT_POSINT)
556 {
557 error = _("Repeat count cannot follow P descriptor");
558 goto syntax;
559 }
560
561 saved_token = t;
562 }
563
564 goto optional_comma;
565
566 case FMT_POS:
567 case FMT_L:
568 t = format_lex ();
569 if (t == FMT_POSINT)
570 break;
571
572 error = posint_required;
573 goto syntax;
574
575 case FMT_A:
576 t = format_lex ();
577 if (t != FMT_POSINT)
578 saved_token = t;
579 break;
580
581 case FMT_D:
582 case FMT_E:
583 case FMT_G:
584 case FMT_EXT:
585 u = format_lex ();
586 if (u != FMT_POSINT)
587 {
588 error = posint_required;
589 goto syntax;
590 }
591
592 u = format_lex ();
593 if (u != FMT_PERIOD)
594 {
595 error = period_required;
596 goto syntax;
597 }
598
599 u = format_lex ();
600 if (u != FMT_ZERO && u != FMT_POSINT)
601 {
602 error = nonneg_required;
603 goto syntax;
604 }
605
606 if (t == FMT_D)
607 break;
608
609 /* Look for optional exponent. */
610 u = format_lex ();
611 if (u != FMT_E)
612 {
613 saved_token = u;
614 }
615 else
616 {
617 u = format_lex ();
618 if (u != FMT_POSINT)
619 {
620 error = _("Positive exponent width required");
621 goto syntax;
622 }
623 }
624
625 break;
626
627 case FMT_F:
628 t = format_lex ();
629 if (t != FMT_ZERO && t != FMT_POSINT)
630 {
631 error = nonneg_required;
632 goto syntax;
633 }
634
635 t = format_lex ();
636 if (t != FMT_PERIOD)
637 {
638 error = period_required;
639 goto syntax;
640 }
641
642 t = format_lex ();
643 if (t != FMT_ZERO && t != FMT_POSINT)
644 {
645 error = nonneg_required;
646 goto syntax;
647 }
648
649 break;
650
651 case FMT_H:
652 if(mode == MODE_STRING)
653 {
654 format_string += value;
655 format_length -= value;
656 }
657 else
658 {
659 while(repeat >0)
660 {
661 next_char(1);
662 repeat -- ;
663 }
664 }
665 break;
666
667 case FMT_IBOZ:
668 t = format_lex ();
669 if (t != FMT_ZERO && t != FMT_POSINT)
670 {
671 error = nonneg_required;
672 goto syntax;
673 }
674
675 t = format_lex ();
676 if (t != FMT_PERIOD)
677 {
678 saved_token = t;
679 }
680 else
681 {
682 t = format_lex ();
683 if (t != FMT_ZERO && t != FMT_POSINT)
684 {
685 error = nonneg_required;
686 goto syntax;
687 }
688 }
689
690 break;
691
692 default:
693 error = unexpected_element;
694 goto syntax;
695 }
696
697 between_desc:
698 /* Between a descriptor and what comes next. */
699 t = format_lex ();
700 switch (t)
701 {
702
703 case FMT_COMMA:
704 goto format_item;
705
706 case FMT_RPAREN:
707 level--;
708 if (level < 0)
709 goto finished;
710 goto between_desc;
711
712 case FMT_COLON:
713 case FMT_SLASH:
714 goto optional_comma;
715
716 case FMT_END:
717 error = unexpected_end;
718 goto syntax;
719
720 default:
721 if (gfc_notify_std (GFC_STD_GNU, "Extension: Missing comma at %C")
722 == FAILURE)
723 return FAILURE;
724 goto format_item_1;
725 }
726
727 optional_comma:
728 /* Optional comma is a weird between state where we've just finished
729 reading a colon, slash or P descriptor. */
730 t = format_lex ();
731 switch (t)
732 {
733 case FMT_COMMA:
734 break;
735
736 case FMT_RPAREN:
737 level--;
738 if (level < 0)
739 goto finished;
740 goto between_desc;
741
742 default:
743 /* Assume that we have another format item. */
744 saved_token = t;
745 break;
746 }
747
748 goto format_item;
749
750 extension_optional_comma:
751 /* As a GNU extension, permit a missing comma after a string literal. */
752 t = format_lex ();
753 switch (t)
754 {
755 case FMT_COMMA:
756 break;
757
758 case FMT_RPAREN:
759 level--;
760 if (level < 0)
761 goto finished;
762 goto between_desc;
763
764 case FMT_COLON:
765 case FMT_SLASH:
766 goto optional_comma;
767
768 case FMT_END:
769 error = unexpected_end;
770 goto syntax;
771
772 default:
773 if (gfc_notify_std (GFC_STD_GNU, "Extension: Missing comma at %C")
774 == FAILURE)
775 return FAILURE;
776 saved_token = t;
777 break;
778 }
779
780 goto format_item;
781
782 syntax:
783 /* Something went wrong. If the format we're checking is a string,
784 generate a warning, since the program is correct. If the format
785 is in a FORMAT statement, this messes up parsing, which is an
786 error. */
787 if (mode != MODE_STRING)
788 gfc_error ("%s in format string at %C", error);
789 else
790 {
791 gfc_warning ("%s in format string at %C", error);
792
793 /* TODO: More elaborate measures are needed to show where a problem
794 is within a format string that has been calculated. */
795 }
796
797 rv = FAILURE;
798
799 finished:
800 return rv;
801 }
802
803
804 /* Given an expression node that is a constant string, see if it looks
805 like a format string. */
806
807 static void
808 check_format_string (gfc_expr * e)
809 {
810
811 mode = MODE_STRING;
812 format_string = e->value.character.string;
813 check_format ();
814 }
815
816
817 /************ Fortran 95 I/O statement matchers *************/
818
819 /* Match a FORMAT statement. This amounts to actually parsing the
820 format descriptors in order to correctly locate the end of the
821 format string. */
822
823 match
824 gfc_match_format (void)
825 {
826 gfc_expr *e;
827 locus start;
828
829 if (gfc_current_ns->proc_name
830 && gfc_current_ns->proc_name->attr.flavor == FL_MODULE)
831 {
832 gfc_error ("Format statement in module main block at %C.");
833 return MATCH_ERROR;
834 }
835
836 if (gfc_statement_label == NULL)
837 {
838 gfc_error ("Missing format label at %C");
839 return MATCH_ERROR;
840 }
841 gfc_gobble_whitespace ();
842
843 mode = MODE_FORMAT;
844 format_length = 0;
845
846 start = gfc_current_locus;
847
848 if (check_format () == FAILURE)
849 return MATCH_ERROR;
850
851 if (gfc_match_eos () != MATCH_YES)
852 {
853 gfc_syntax_error (ST_FORMAT);
854 return MATCH_ERROR;
855 }
856
857 /* The label doesn't get created until after the statement is done
858 being matched, so we have to leave the string for later. */
859
860 gfc_current_locus = start; /* Back to the beginning */
861
862 new_st.loc = start;
863 new_st.op = EXEC_NOP;
864
865 e = gfc_get_expr();
866 e->expr_type = EXPR_CONSTANT;
867 e->ts.type = BT_CHARACTER;
868 e->ts.kind = gfc_default_character_kind;
869 e->where = start;
870 e->value.character.string = format_string = gfc_getmem(format_length+1);
871 e->value.character.length = format_length;
872 gfc_statement_label->format = e;
873
874 mode = MODE_COPY;
875 check_format (); /* Guaranteed to succeed */
876 gfc_match_eos (); /* Guaranteed to succeed */
877
878 return MATCH_YES;
879 }
880
881
882 /* Match an expression I/O tag of some sort. */
883
884 static match
885 match_etag (const io_tag * tag, gfc_expr ** v)
886 {
887 gfc_expr *result;
888 match m;
889
890 m = gfc_match (tag->spec, &result);
891 if (m != MATCH_YES)
892 return m;
893
894 if (*v != NULL)
895 {
896 gfc_error ("Duplicate %s specification at %C", tag->name);
897 gfc_free_expr (result);
898 return MATCH_ERROR;
899 }
900
901 *v = result;
902 return MATCH_YES;
903 }
904
905
906 /* Match a variable I/O tag of some sort. */
907
908 static match
909 match_vtag (const io_tag * tag, gfc_expr ** v)
910 {
911 gfc_expr *result;
912 match m;
913
914 m = gfc_match (tag->spec, &result);
915 if (m != MATCH_YES)
916 return m;
917
918 if (*v != NULL)
919 {
920 gfc_error ("Duplicate %s specification at %C", tag->name);
921 gfc_free_expr (result);
922 return MATCH_ERROR;
923 }
924
925 if (result->symtree->n.sym->attr.intent == INTENT_IN)
926 {
927 gfc_error ("Variable tag cannot be INTENT(IN) at %C");
928 gfc_free_expr (result);
929 return MATCH_ERROR;
930 }
931
932 if (gfc_pure (NULL) && gfc_impure_variable (result->symtree->n.sym))
933 {
934 gfc_error ("Variable tag cannot be assigned in PURE procedure at %C");
935 gfc_free_expr (result);
936 return MATCH_ERROR;
937 }
938
939 *v = result;
940 return MATCH_YES;
941 }
942
943
944 /* Match I/O tags that cause variables to become redefined. */
945
946 static match
947 match_out_tag(const io_tag *tag, gfc_expr **result)
948 {
949 match m;
950
951 m = match_vtag(tag, result);
952 if (m == MATCH_YES)
953 gfc_check_do_variable((*result)->symtree);
954
955 return m;
956 }
957
958
959 /* Match a label I/O tag. */
960
961 static match
962 match_ltag (const io_tag * tag, gfc_st_label ** label)
963 {
964 match m;
965 gfc_st_label *old;
966
967 old = *label;
968 m = gfc_match (tag->spec, label);
969 if (m == MATCH_YES && old != 0)
970 {
971 gfc_error ("Duplicate %s label specification at %C", tag->name);
972 return MATCH_ERROR;
973 }
974
975 if (m == MATCH_YES
976 && gfc_reference_st_label (*label, ST_LABEL_TARGET) == FAILURE)
977 return MATCH_ERROR;
978
979 return m;
980 }
981
982
983 /* Do expression resolution and type-checking on an expression tag. */
984
985 static try
986 resolve_tag (const io_tag * tag, gfc_expr * e)
987 {
988
989 if (e == NULL)
990 return SUCCESS;
991
992 if (gfc_resolve_expr (e) == FAILURE)
993 return FAILURE;
994
995 if (e->ts.type != tag->type && tag != &tag_format)
996 {
997 gfc_error ("%s tag at %L must be of type %s", tag->name,
998 &e->where, gfc_basic_typename (tag->type));
999 return FAILURE;
1000 }
1001
1002 if (tag == &tag_format)
1003 {
1004 if (e->expr_type == EXPR_CONSTANT
1005 && (e->ts.type != BT_CHARACTER
1006 || e->ts.kind != gfc_default_character_kind))
1007 {
1008 gfc_error ("Constant expression in FORMAT tag at %L must be "
1009 "of type default CHARACTER", &e->where);
1010 return FAILURE;
1011 }
1012
1013 /* If e's rank is zero and e is not an element of an array, it should be
1014 of integer or character type. The integer variable should be
1015 ASSIGNED. */
1016 if (e->symtree == NULL || e->symtree->n.sym->as == NULL
1017 || e->symtree->n.sym->as->rank == 0)
1018 {
1019 if (e->ts.type != BT_CHARACTER && e->ts.type != BT_INTEGER)
1020 {
1021 gfc_error ("%s tag at %L must be of type %s or %s", tag->name,
1022 &e->where, gfc_basic_typename (BT_CHARACTER),
1023 gfc_basic_typename (BT_INTEGER));
1024 return FAILURE;
1025 }
1026 else if (e->ts.type == BT_INTEGER && e->expr_type == EXPR_VARIABLE)
1027 {
1028 if (gfc_notify_std (GFC_STD_F95_DEL,
1029 "Obsolete: ASSIGNED variable in FORMAT tag at %L",
1030 &e->where) == FAILURE)
1031 return FAILURE;
1032 if (e->symtree->n.sym->attr.assign != 1)
1033 {
1034 gfc_error ("Variable '%s' at %L has not been assigned a "
1035 "format label", e->symtree->n.sym->name, &e->where);
1036 return FAILURE;
1037 }
1038 }
1039 return SUCCESS;
1040 }
1041 else
1042 {
1043 /* if rank is nonzero, we allow the type to be character under
1044 GFC_STD_GNU and other type under GFC_STD_LEGACY. It may be
1045 assigned an Hollerith constant. */
1046 if (e->ts.type == BT_CHARACTER)
1047 {
1048 if (gfc_notify_std (GFC_STD_GNU,
1049 "Extension: Character array in FORMAT tag at %L",
1050 &e->where) == FAILURE)
1051 return FAILURE;
1052 }
1053 else
1054 {
1055 if (gfc_notify_std (GFC_STD_LEGACY,
1056 "Extension: Non-character in FORMAT tag at %L",
1057 &e->where) == FAILURE)
1058 return FAILURE;
1059 }
1060 return SUCCESS;
1061 }
1062 }
1063 else
1064 {
1065 if (e->rank != 0)
1066 {
1067 gfc_error ("%s tag at %L must be scalar", tag->name, &e->where);
1068 return FAILURE;
1069 }
1070
1071 if (tag == &tag_iomsg)
1072 {
1073 if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: IOMSG tag at %L",
1074 &e->where) == FAILURE)
1075 return FAILURE;
1076 }
1077
1078 if (tag == &tag_iostat && e->ts.kind != gfc_default_integer_kind)
1079 {
1080 if (gfc_notify_std (GFC_STD_GNU, "Fortran 95 requires default "
1081 "INTEGER in IOSTAT tag at %L",
1082 &e->where) == FAILURE)
1083 return FAILURE;
1084 }
1085
1086 if (tag == &tag_size && e->ts.kind != gfc_default_integer_kind)
1087 {
1088 if (gfc_notify_std (GFC_STD_GNU, "Fortran 95 requires default "
1089 "INTEGER in SIZE tag at %L",
1090 &e->where) == FAILURE)
1091 return FAILURE;
1092 }
1093
1094 if (tag == &tag_convert)
1095 {
1096 if (gfc_notify_std (GFC_STD_GNU, "Extension: CONVERT tag at %L",
1097 &e->where) == FAILURE)
1098 return FAILURE;
1099 }
1100 }
1101
1102 return SUCCESS;
1103 }
1104
1105
1106 /* Match a single tag of an OPEN statement. */
1107
1108 static match
1109 match_open_element (gfc_open * open)
1110 {
1111 match m;
1112
1113 m = match_etag (&tag_unit, &open->unit);
1114 if (m != MATCH_NO)
1115 return m;
1116 m = match_out_tag (&tag_iomsg, &open->iomsg);
1117 if (m != MATCH_NO)
1118 return m;
1119 m = match_out_tag (&tag_iostat, &open->iostat);
1120 if (m != MATCH_NO)
1121 return m;
1122 m = match_etag (&tag_file, &open->file);
1123 if (m != MATCH_NO)
1124 return m;
1125 m = match_etag (&tag_status, &open->status);
1126 if (m != MATCH_NO)
1127 return m;
1128 m = match_etag (&tag_e_access, &open->access);
1129 if (m != MATCH_NO)
1130 return m;
1131 m = match_etag (&tag_e_form, &open->form);
1132 if (m != MATCH_NO)
1133 return m;
1134 m = match_etag (&tag_e_recl, &open->recl);
1135 if (m != MATCH_NO)
1136 return m;
1137 m = match_etag (&tag_e_blank, &open->blank);
1138 if (m != MATCH_NO)
1139 return m;
1140 m = match_etag (&tag_e_position, &open->position);
1141 if (m != MATCH_NO)
1142 return m;
1143 m = match_etag (&tag_e_action, &open->action);
1144 if (m != MATCH_NO)
1145 return m;
1146 m = match_etag (&tag_e_delim, &open->delim);
1147 if (m != MATCH_NO)
1148 return m;
1149 m = match_etag (&tag_e_pad, &open->pad);
1150 if (m != MATCH_NO)
1151 return m;
1152 m = match_ltag (&tag_err, &open->err);
1153 if (m != MATCH_NO)
1154 return m;
1155 m = match_etag (&tag_convert, &open->convert);
1156 if (m != MATCH_NO)
1157 return m;
1158
1159 return MATCH_NO;
1160 }
1161
1162
1163 /* Free the gfc_open structure and all the expressions it contains. */
1164
1165 void
1166 gfc_free_open (gfc_open * open)
1167 {
1168
1169 if (open == NULL)
1170 return;
1171
1172 gfc_free_expr (open->unit);
1173 gfc_free_expr (open->iomsg);
1174 gfc_free_expr (open->iostat);
1175 gfc_free_expr (open->file);
1176 gfc_free_expr (open->status);
1177 gfc_free_expr (open->access);
1178 gfc_free_expr (open->form);
1179 gfc_free_expr (open->recl);
1180 gfc_free_expr (open->blank);
1181 gfc_free_expr (open->position);
1182 gfc_free_expr (open->action);
1183 gfc_free_expr (open->delim);
1184 gfc_free_expr (open->pad);
1185 gfc_free_expr (open->convert);
1186
1187 gfc_free (open);
1188 }
1189
1190
1191 /* Resolve everything in a gfc_open structure. */
1192
1193 try
1194 gfc_resolve_open (gfc_open * open)
1195 {
1196
1197 RESOLVE_TAG (&tag_unit, open->unit);
1198 RESOLVE_TAG (&tag_iomsg, open->iomsg);
1199 RESOLVE_TAG (&tag_iostat, open->iostat);
1200 RESOLVE_TAG (&tag_file, open->file);
1201 RESOLVE_TAG (&tag_status, open->status);
1202 RESOLVE_TAG (&tag_e_access, open->access);
1203 RESOLVE_TAG (&tag_e_form, open->form);
1204 RESOLVE_TAG (&tag_e_recl, open->recl);
1205
1206 RESOLVE_TAG (&tag_e_blank, open->blank);
1207 RESOLVE_TAG (&tag_e_position, open->position);
1208 RESOLVE_TAG (&tag_e_action, open->action);
1209 RESOLVE_TAG (&tag_e_delim, open->delim);
1210 RESOLVE_TAG (&tag_e_pad, open->pad);
1211 RESOLVE_TAG (&tag_convert, open->convert);
1212
1213 if (gfc_reference_st_label (open->err, ST_LABEL_TARGET) == FAILURE)
1214 return FAILURE;
1215
1216 return SUCCESS;
1217 }
1218
1219
1220 /* Match an OPEN statement. */
1221
1222 match
1223 gfc_match_open (void)
1224 {
1225 gfc_open *open;
1226 match m;
1227
1228 m = gfc_match_char ('(');
1229 if (m == MATCH_NO)
1230 return m;
1231
1232 open = gfc_getmem (sizeof (gfc_open));
1233
1234 m = match_open_element (open);
1235
1236 if (m == MATCH_ERROR)
1237 goto cleanup;
1238 if (m == MATCH_NO)
1239 {
1240 m = gfc_match_expr (&open->unit);
1241 if (m == MATCH_NO)
1242 goto syntax;
1243 if (m == MATCH_ERROR)
1244 goto cleanup;
1245 }
1246
1247 for (;;)
1248 {
1249 if (gfc_match_char (')') == MATCH_YES)
1250 break;
1251 if (gfc_match_char (',') != MATCH_YES)
1252 goto syntax;
1253
1254 m = match_open_element (open);
1255 if (m == MATCH_ERROR)
1256 goto cleanup;
1257 if (m == MATCH_NO)
1258 goto syntax;
1259 }
1260
1261 if (gfc_match_eos () == MATCH_NO)
1262 goto syntax;
1263
1264 if (gfc_pure (NULL))
1265 {
1266 gfc_error ("OPEN statement not allowed in PURE procedure at %C");
1267 goto cleanup;
1268 }
1269
1270 new_st.op = EXEC_OPEN;
1271 new_st.ext.open = open;
1272 return MATCH_YES;
1273
1274 syntax:
1275 gfc_syntax_error (ST_OPEN);
1276
1277 cleanup:
1278 gfc_free_open (open);
1279 return MATCH_ERROR;
1280 }
1281
1282
1283 /* Free a gfc_close structure an all its expressions. */
1284
1285 void
1286 gfc_free_close (gfc_close * close)
1287 {
1288
1289 if (close == NULL)
1290 return;
1291
1292 gfc_free_expr (close->unit);
1293 gfc_free_expr (close->iomsg);
1294 gfc_free_expr (close->iostat);
1295 gfc_free_expr (close->status);
1296
1297 gfc_free (close);
1298 }
1299
1300
1301 /* Match elements of a CLOSE statement. */
1302
1303 static match
1304 match_close_element (gfc_close * close)
1305 {
1306 match m;
1307
1308 m = match_etag (&tag_unit, &close->unit);
1309 if (m != MATCH_NO)
1310 return m;
1311 m = match_etag (&tag_status, &close->status);
1312 if (m != MATCH_NO)
1313 return m;
1314 m = match_out_tag (&tag_iomsg, &close->iomsg);
1315 if (m != MATCH_NO)
1316 return m;
1317 m = match_out_tag (&tag_iostat, &close->iostat);
1318 if (m != MATCH_NO)
1319 return m;
1320 m = match_ltag (&tag_err, &close->err);
1321 if (m != MATCH_NO)
1322 return m;
1323
1324 return MATCH_NO;
1325 }
1326
1327
1328 /* Match a CLOSE statement. */
1329
1330 match
1331 gfc_match_close (void)
1332 {
1333 gfc_close *close;
1334 match m;
1335
1336 m = gfc_match_char ('(');
1337 if (m == MATCH_NO)
1338 return m;
1339
1340 close = gfc_getmem (sizeof (gfc_close));
1341
1342 m = match_close_element (close);
1343
1344 if (m == MATCH_ERROR)
1345 goto cleanup;
1346 if (m == MATCH_NO)
1347 {
1348 m = gfc_match_expr (&close->unit);
1349 if (m == MATCH_NO)
1350 goto syntax;
1351 if (m == MATCH_ERROR)
1352 goto cleanup;
1353 }
1354
1355 for (;;)
1356 {
1357 if (gfc_match_char (')') == MATCH_YES)
1358 break;
1359 if (gfc_match_char (',') != MATCH_YES)
1360 goto syntax;
1361
1362 m = match_close_element (close);
1363 if (m == MATCH_ERROR)
1364 goto cleanup;
1365 if (m == MATCH_NO)
1366 goto syntax;
1367 }
1368
1369 if (gfc_match_eos () == MATCH_NO)
1370 goto syntax;
1371
1372 if (gfc_pure (NULL))
1373 {
1374 gfc_error ("CLOSE statement not allowed in PURE procedure at %C");
1375 goto cleanup;
1376 }
1377
1378 new_st.op = EXEC_CLOSE;
1379 new_st.ext.close = close;
1380 return MATCH_YES;
1381
1382 syntax:
1383 gfc_syntax_error (ST_CLOSE);
1384
1385 cleanup:
1386 gfc_free_close (close);
1387 return MATCH_ERROR;
1388 }
1389
1390
1391 /* Resolve everything in a gfc_close structure. */
1392
1393 try
1394 gfc_resolve_close (gfc_close * close)
1395 {
1396
1397 RESOLVE_TAG (&tag_unit, close->unit);
1398 RESOLVE_TAG (&tag_iomsg, close->iomsg);
1399 RESOLVE_TAG (&tag_iostat, close->iostat);
1400 RESOLVE_TAG (&tag_status, close->status);
1401
1402 if (gfc_reference_st_label (close->err, ST_LABEL_TARGET) == FAILURE)
1403 return FAILURE;
1404
1405 return SUCCESS;
1406 }
1407
1408
1409 /* Free a gfc_filepos structure. */
1410
1411 void
1412 gfc_free_filepos (gfc_filepos * fp)
1413 {
1414
1415 gfc_free_expr (fp->unit);
1416 gfc_free_expr (fp->iomsg);
1417 gfc_free_expr (fp->iostat);
1418 gfc_free (fp);
1419 }
1420
1421
1422 /* Match elements of a REWIND, BACKSPACE, ENDFILE, or FLUSH statement. */
1423
1424 static match
1425 match_file_element (gfc_filepos * fp)
1426 {
1427 match m;
1428
1429 m = match_etag (&tag_unit, &fp->unit);
1430 if (m != MATCH_NO)
1431 return m;
1432 m = match_out_tag (&tag_iomsg, &fp->iomsg);
1433 if (m != MATCH_NO)
1434 return m;
1435 m = match_out_tag (&tag_iostat, &fp->iostat);
1436 if (m != MATCH_NO)
1437 return m;
1438 m = match_ltag (&tag_err, &fp->err);
1439 if (m != MATCH_NO)
1440 return m;
1441
1442 return MATCH_NO;
1443 }
1444
1445
1446 /* Match the second half of the file-positioning statements, REWIND,
1447 BACKSPACE, ENDFILE, or the FLUSH statement. */
1448
1449 static match
1450 match_filepos (gfc_statement st, gfc_exec_op op)
1451 {
1452 gfc_filepos *fp;
1453 match m;
1454
1455 fp = gfc_getmem (sizeof (gfc_filepos));
1456
1457 if (gfc_match_char ('(') == MATCH_NO)
1458 {
1459 m = gfc_match_expr (&fp->unit);
1460 if (m == MATCH_ERROR)
1461 goto cleanup;
1462 if (m == MATCH_NO)
1463 goto syntax;
1464
1465 goto done;
1466 }
1467
1468 m = match_file_element (fp);
1469 if (m == MATCH_ERROR)
1470 goto done;
1471 if (m == MATCH_NO)
1472 {
1473 m = gfc_match_expr (&fp->unit);
1474 if (m == MATCH_ERROR)
1475 goto done;
1476 if (m == MATCH_NO)
1477 goto syntax;
1478 }
1479
1480 for (;;)
1481 {
1482 if (gfc_match_char (')') == MATCH_YES)
1483 break;
1484 if (gfc_match_char (',') != MATCH_YES)
1485 goto syntax;
1486
1487 m = match_file_element (fp);
1488 if (m == MATCH_ERROR)
1489 goto cleanup;
1490 if (m == MATCH_NO)
1491 goto syntax;
1492 }
1493
1494 done:
1495 if (gfc_match_eos () != MATCH_YES)
1496 goto syntax;
1497
1498 if (gfc_pure (NULL))
1499 {
1500 gfc_error ("%s statement not allowed in PURE procedure at %C",
1501 gfc_ascii_statement (st));
1502
1503 goto cleanup;
1504 }
1505
1506 new_st.op = op;
1507 new_st.ext.filepos = fp;
1508 return MATCH_YES;
1509
1510 syntax:
1511 gfc_syntax_error (st);
1512
1513 cleanup:
1514 gfc_free_filepos (fp);
1515 return MATCH_ERROR;
1516 }
1517
1518
1519 try
1520 gfc_resolve_filepos (gfc_filepos * fp)
1521 {
1522
1523 RESOLVE_TAG (&tag_unit, fp->unit);
1524 RESOLVE_TAG (&tag_iostat, fp->iostat);
1525 RESOLVE_TAG (&tag_iomsg, fp->iomsg);
1526 if (gfc_reference_st_label (fp->err, ST_LABEL_TARGET) == FAILURE)
1527 return FAILURE;
1528
1529 return SUCCESS;
1530 }
1531
1532
1533 /* Match the file positioning statements: ENDFILE, BACKSPACE, REWIND,
1534 and the FLUSH statement. */
1535
1536 match
1537 gfc_match_endfile (void)
1538 {
1539
1540 return match_filepos (ST_END_FILE, EXEC_ENDFILE);
1541 }
1542
1543 match
1544 gfc_match_backspace (void)
1545 {
1546
1547 return match_filepos (ST_BACKSPACE, EXEC_BACKSPACE);
1548 }
1549
1550 match
1551 gfc_match_rewind (void)
1552 {
1553
1554 return match_filepos (ST_REWIND, EXEC_REWIND);
1555 }
1556
1557 match
1558 gfc_match_flush (void)
1559 {
1560 if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: FLUSH statement at %C") == FAILURE)
1561 return MATCH_ERROR;
1562
1563 return match_filepos (ST_FLUSH, EXEC_FLUSH);
1564 }
1565
1566 /******************** Data Transfer Statements *********************/
1567
1568 typedef enum
1569 { M_READ, M_WRITE, M_PRINT, M_INQUIRE }
1570 io_kind;
1571
1572
1573 /* Return a default unit number. */
1574
1575 static gfc_expr *
1576 default_unit (io_kind k)
1577 {
1578 int unit;
1579
1580 if (k == M_READ)
1581 unit = 5;
1582 else
1583 unit = 6;
1584
1585 return gfc_int_expr (unit);
1586 }
1587
1588
1589 /* Match a unit specification for a data transfer statement. */
1590
1591 static match
1592 match_dt_unit (io_kind k, gfc_dt * dt)
1593 {
1594 gfc_expr *e;
1595
1596 if (gfc_match_char ('*') == MATCH_YES)
1597 {
1598 if (dt->io_unit != NULL)
1599 goto conflict;
1600
1601 dt->io_unit = default_unit (k);
1602 return MATCH_YES;
1603 }
1604
1605 if (gfc_match_expr (&e) == MATCH_YES)
1606 {
1607 if (dt->io_unit != NULL)
1608 {
1609 gfc_free_expr (e);
1610 goto conflict;
1611 }
1612
1613 dt->io_unit = e;
1614 return MATCH_YES;
1615 }
1616
1617 return MATCH_NO;
1618
1619 conflict:
1620 gfc_error ("Duplicate UNIT specification at %C");
1621 return MATCH_ERROR;
1622 }
1623
1624
1625 /* Match a format specification. */
1626
1627 static match
1628 match_dt_format (gfc_dt * dt)
1629 {
1630 locus where;
1631 gfc_expr *e;
1632 gfc_st_label *label;
1633
1634 where = gfc_current_locus;
1635
1636 if (gfc_match_char ('*') == MATCH_YES)
1637 {
1638 if (dt->format_expr != NULL || dt->format_label != NULL)
1639 goto conflict;
1640
1641 dt->format_label = &format_asterisk;
1642 return MATCH_YES;
1643 }
1644
1645 if (gfc_match_st_label (&label) == MATCH_YES)
1646 {
1647 if (dt->format_expr != NULL || dt->format_label != NULL)
1648 {
1649 gfc_free_st_label (label);
1650 goto conflict;
1651 }
1652
1653 if (gfc_reference_st_label (label, ST_LABEL_FORMAT) == FAILURE)
1654 return MATCH_ERROR;
1655
1656 dt->format_label = label;
1657 return MATCH_YES;
1658 }
1659
1660 if (gfc_match_expr (&e) == MATCH_YES)
1661 {
1662 if (dt->format_expr != NULL || dt->format_label != NULL)
1663 {
1664 gfc_free_expr (e);
1665 goto conflict;
1666 }
1667 dt->format_expr = e;
1668 return MATCH_YES;
1669 }
1670
1671 gfc_current_locus = where; /* The only case where we have to restore */
1672
1673 return MATCH_NO;
1674
1675 conflict:
1676 gfc_error ("Duplicate format specification at %C");
1677 return MATCH_ERROR;
1678 }
1679
1680
1681 /* Traverse a namelist that is part of a READ statement to make sure
1682 that none of the variables in the namelist are INTENT(IN). Returns
1683 nonzero if we find such a variable. */
1684
1685 static int
1686 check_namelist (gfc_symbol * sym)
1687 {
1688 gfc_namelist *p;
1689
1690 for (p = sym->namelist; p; p = p->next)
1691 if (p->sym->attr.intent == INTENT_IN)
1692 {
1693 gfc_error ("Symbol '%s' in namelist '%s' is INTENT(IN) at %C",
1694 p->sym->name, sym->name);
1695 return 1;
1696 }
1697
1698 return 0;
1699 }
1700
1701
1702 /* Match a single data transfer element. */
1703
1704 static match
1705 match_dt_element (io_kind k, gfc_dt * dt)
1706 {
1707 char name[GFC_MAX_SYMBOL_LEN + 1];
1708 gfc_symbol *sym;
1709 match m;
1710
1711 if (gfc_match (" unit =") == MATCH_YES)
1712 {
1713 m = match_dt_unit (k, dt);
1714 if (m != MATCH_NO)
1715 return m;
1716 }
1717
1718 if (gfc_match (" fmt =") == MATCH_YES)
1719 {
1720 m = match_dt_format (dt);
1721 if (m != MATCH_NO)
1722 return m;
1723 }
1724
1725 if (gfc_match (" nml = %n", name) == MATCH_YES)
1726 {
1727 if (dt->namelist != NULL)
1728 {
1729 gfc_error ("Duplicate NML specification at %C");
1730 return MATCH_ERROR;
1731 }
1732
1733 if (gfc_find_symbol (name, NULL, 1, &sym))
1734 return MATCH_ERROR;
1735
1736 if (sym == NULL || sym->attr.flavor != FL_NAMELIST)
1737 {
1738 gfc_error ("Symbol '%s' at %C must be a NAMELIST group name",
1739 sym != NULL ? sym->name : name);
1740 return MATCH_ERROR;
1741 }
1742
1743 dt->namelist = sym;
1744 if (k == M_READ && check_namelist (sym))
1745 return MATCH_ERROR;
1746
1747 return MATCH_YES;
1748 }
1749
1750 m = match_etag (&tag_rec, &dt->rec);
1751 if (m != MATCH_NO)
1752 return m;
1753 m = match_out_tag (&tag_iomsg, &dt->iomsg);
1754 if (m != MATCH_NO)
1755 return m;
1756 m = match_out_tag (&tag_iostat, &dt->iostat);
1757 if (m != MATCH_NO)
1758 return m;
1759 m = match_ltag (&tag_err, &dt->err);
1760 if (m == MATCH_YES)
1761 dt->err_where = gfc_current_locus;
1762 if (m != MATCH_NO)
1763 return m;
1764 m = match_etag (&tag_advance, &dt->advance);
1765 if (m != MATCH_NO)
1766 return m;
1767 m = match_out_tag (&tag_size, &dt->size);
1768 if (m != MATCH_NO)
1769 return m;
1770
1771 m = match_ltag (&tag_end, &dt->end);
1772 if (m == MATCH_YES)
1773 {
1774 if (k == M_WRITE)
1775 {
1776 gfc_error ("END tag at %C not allowed in output statement");
1777 return MATCH_ERROR;
1778 }
1779 dt->end_where = gfc_current_locus;
1780 }
1781 if (m != MATCH_NO)
1782 return m;
1783
1784 m = match_ltag (&tag_eor, &dt->eor);
1785 if (m == MATCH_YES)
1786 dt->eor_where = gfc_current_locus;
1787 if (m != MATCH_NO)
1788 return m;
1789
1790 return MATCH_NO;
1791 }
1792
1793
1794 /* Free a data transfer structure and everything below it. */
1795
1796 void
1797 gfc_free_dt (gfc_dt * dt)
1798 {
1799
1800 if (dt == NULL)
1801 return;
1802
1803 gfc_free_expr (dt->io_unit);
1804 gfc_free_expr (dt->format_expr);
1805 gfc_free_expr (dt->rec);
1806 gfc_free_expr (dt->advance);
1807 gfc_free_expr (dt->iomsg);
1808 gfc_free_expr (dt->iostat);
1809 gfc_free_expr (dt->size);
1810
1811 gfc_free (dt);
1812 }
1813
1814
1815 /* Resolve everything in a gfc_dt structure. */
1816
1817 try
1818 gfc_resolve_dt (gfc_dt * dt)
1819 {
1820 gfc_expr *e;
1821
1822 RESOLVE_TAG (&tag_format, dt->format_expr);
1823 RESOLVE_TAG (&tag_rec, dt->rec);
1824 RESOLVE_TAG (&tag_advance, dt->advance);
1825 RESOLVE_TAG (&tag_iomsg, dt->iomsg);
1826 RESOLVE_TAG (&tag_iostat, dt->iostat);
1827 RESOLVE_TAG (&tag_size, dt->size);
1828
1829 e = dt->io_unit;
1830 if (gfc_resolve_expr (e) == SUCCESS
1831 && (e->ts.type != BT_INTEGER
1832 && (e->ts.type != BT_CHARACTER
1833 || e->expr_type != EXPR_VARIABLE)))
1834 {
1835 gfc_error
1836 ("UNIT specification at %L must be an INTEGER expression or a "
1837 "CHARACTER variable", &e->where);
1838 return FAILURE;
1839 }
1840
1841 if (e->ts.type == BT_CHARACTER)
1842 {
1843 if (gfc_has_vector_index (e))
1844 {
1845 gfc_error ("Internal unit with vector subscript at %L",
1846 &e->where);
1847 return FAILURE;
1848 }
1849 }
1850
1851 if (e->rank && e->ts.type != BT_CHARACTER)
1852 {
1853 gfc_error ("External IO UNIT cannot be an array at %L", &e->where);
1854 return FAILURE;
1855 }
1856
1857 if (dt->err)
1858 {
1859 if (gfc_reference_st_label (dt->err, ST_LABEL_TARGET) == FAILURE)
1860 return FAILURE;
1861 if (dt->err->defined == ST_LABEL_UNKNOWN)
1862 {
1863 gfc_error ("ERR tag label %d at %L not defined",
1864 dt->err->value, &dt->err_where);
1865 return FAILURE;
1866 }
1867 }
1868
1869 if (dt->end)
1870 {
1871 if (gfc_reference_st_label (dt->end, ST_LABEL_TARGET) == FAILURE)
1872 return FAILURE;
1873 if (dt->end->defined == ST_LABEL_UNKNOWN)
1874 {
1875 gfc_error ("END tag label %d at %L not defined",
1876 dt->end->value, &dt->end_where);
1877 return FAILURE;
1878 }
1879 }
1880
1881 if (dt->eor)
1882 {
1883 if (gfc_reference_st_label (dt->eor, ST_LABEL_TARGET) == FAILURE)
1884 return FAILURE;
1885 if (dt->eor->defined == ST_LABEL_UNKNOWN)
1886 {
1887 gfc_error ("EOR tag label %d at %L not defined",
1888 dt->eor->value, &dt->eor_where);
1889 return FAILURE;
1890 }
1891 }
1892
1893 /* Check the format label actually exists. */
1894 if (dt->format_label && dt->format_label != &format_asterisk
1895 && dt->format_label->defined == ST_LABEL_UNKNOWN)
1896 {
1897 gfc_error ("FORMAT label %d at %L not defined", dt->format_label->value,
1898 &dt->format_label->where);
1899 return FAILURE;
1900 }
1901 return SUCCESS;
1902 }
1903
1904
1905 /* Given an io_kind, return its name. */
1906
1907 static const char *
1908 io_kind_name (io_kind k)
1909 {
1910 const char *name;
1911
1912 switch (k)
1913 {
1914 case M_READ:
1915 name = "READ";
1916 break;
1917 case M_WRITE:
1918 name = "WRITE";
1919 break;
1920 case M_PRINT:
1921 name = "PRINT";
1922 break;
1923 case M_INQUIRE:
1924 name = "INQUIRE";
1925 break;
1926 default:
1927 gfc_internal_error ("io_kind_name(): bad I/O-kind");
1928 }
1929
1930 return name;
1931 }
1932
1933
1934 /* Match an IO iteration statement of the form:
1935
1936 ( [<IO element> ,] <IO element>, I = <expr>, <expr> [, <expr> ] )
1937
1938 which is equivalent to a single IO element. This function is
1939 mutually recursive with match_io_element(). */
1940
1941 static match match_io_element (io_kind k, gfc_code **);
1942
1943 static match
1944 match_io_iterator (io_kind k, gfc_code ** result)
1945 {
1946 gfc_code *head, *tail, *new;
1947 gfc_iterator *iter;
1948 locus old_loc;
1949 match m;
1950 int n;
1951
1952 iter = NULL;
1953 head = NULL;
1954 old_loc = gfc_current_locus;
1955
1956 if (gfc_match_char ('(') != MATCH_YES)
1957 return MATCH_NO;
1958
1959 m = match_io_element (k, &head);
1960 tail = head;
1961
1962 if (m != MATCH_YES || gfc_match_char (',') != MATCH_YES)
1963 {
1964 m = MATCH_NO;
1965 goto cleanup;
1966 }
1967
1968 /* Can't be anything but an IO iterator. Build a list. */
1969 iter = gfc_get_iterator ();
1970
1971 for (n = 1;; n++)
1972 {
1973 m = gfc_match_iterator (iter, 0);
1974 if (m == MATCH_ERROR)
1975 goto cleanup;
1976 if (m == MATCH_YES)
1977 {
1978 gfc_check_do_variable (iter->var->symtree);
1979 break;
1980 }
1981
1982 m = match_io_element (k, &new);
1983 if (m == MATCH_ERROR)
1984 goto cleanup;
1985 if (m == MATCH_NO)
1986 {
1987 if (n > 2)
1988 goto syntax;
1989 goto cleanup;
1990 }
1991
1992 tail = gfc_append_code (tail, new);
1993
1994 if (gfc_match_char (',') != MATCH_YES)
1995 {
1996 if (n > 2)
1997 goto syntax;
1998 m = MATCH_NO;
1999 goto cleanup;
2000 }
2001 }
2002
2003 if (gfc_match_char (')') != MATCH_YES)
2004 goto syntax;
2005
2006 new = gfc_get_code ();
2007 new->op = EXEC_DO;
2008 new->ext.iterator = iter;
2009
2010 new->block = gfc_get_code ();
2011 new->block->op = EXEC_DO;
2012 new->block->next = head;
2013
2014 *result = new;
2015 return MATCH_YES;
2016
2017 syntax:
2018 gfc_error ("Syntax error in I/O iterator at %C");
2019 m = MATCH_ERROR;
2020
2021 cleanup:
2022 gfc_free_iterator (iter, 1);
2023 gfc_free_statements (head);
2024 gfc_current_locus = old_loc;
2025 return m;
2026 }
2027
2028
2029 /* Match a single element of an IO list, which is either a single
2030 expression or an IO Iterator. */
2031
2032 static match
2033 match_io_element (io_kind k, gfc_code ** cpp)
2034 {
2035 gfc_expr *expr;
2036 gfc_code *cp;
2037 match m;
2038
2039 expr = NULL;
2040
2041 m = match_io_iterator (k, cpp);
2042 if (m == MATCH_YES)
2043 return MATCH_YES;
2044
2045 if (k == M_READ)
2046 {
2047 m = gfc_match_variable (&expr, 0);
2048 if (m == MATCH_NO)
2049 gfc_error ("Expected variable in READ statement at %C");
2050 }
2051 else
2052 {
2053 m = gfc_match_expr (&expr);
2054 if (m == MATCH_NO)
2055 gfc_error ("Expected expression in %s statement at %C",
2056 io_kind_name (k));
2057 }
2058
2059 if (m == MATCH_YES)
2060 switch (k)
2061 {
2062 case M_READ:
2063 if (expr->symtree->n.sym->attr.intent == INTENT_IN)
2064 {
2065 gfc_error
2066 ("Variable '%s' in input list at %C cannot be INTENT(IN)",
2067 expr->symtree->n.sym->name);
2068 m = MATCH_ERROR;
2069 }
2070
2071 if (gfc_pure (NULL)
2072 && gfc_impure_variable (expr->symtree->n.sym)
2073 && current_dt->io_unit->ts.type == BT_CHARACTER)
2074 {
2075 gfc_error ("Cannot read to variable '%s' in PURE procedure at %C",
2076 expr->symtree->n.sym->name);
2077 m = MATCH_ERROR;
2078 }
2079
2080 if (gfc_check_do_variable (expr->symtree))
2081 m = MATCH_ERROR;
2082
2083 break;
2084
2085 case M_WRITE:
2086 if (current_dt->io_unit->ts.type == BT_CHARACTER
2087 && gfc_pure (NULL)
2088 && current_dt->io_unit->expr_type == EXPR_VARIABLE
2089 && gfc_impure_variable (current_dt->io_unit->symtree->n.sym))
2090 {
2091 gfc_error
2092 ("Cannot write to internal file unit '%s' at %C inside a "
2093 "PURE procedure", current_dt->io_unit->symtree->n.sym->name);
2094 m = MATCH_ERROR;
2095 }
2096
2097 break;
2098
2099 default:
2100 break;
2101 }
2102
2103 if (m != MATCH_YES)
2104 {
2105 gfc_free_expr (expr);
2106 return MATCH_ERROR;
2107 }
2108
2109 cp = gfc_get_code ();
2110 cp->op = EXEC_TRANSFER;
2111 cp->expr = expr;
2112
2113 *cpp = cp;
2114 return MATCH_YES;
2115 }
2116
2117
2118 /* Match an I/O list, building gfc_code structures as we go. */
2119
2120 static match
2121 match_io_list (io_kind k, gfc_code ** head_p)
2122 {
2123 gfc_code *head, *tail, *new;
2124 match m;
2125
2126 *head_p = head = tail = NULL;
2127 if (gfc_match_eos () == MATCH_YES)
2128 return MATCH_YES;
2129
2130 for (;;)
2131 {
2132 m = match_io_element (k, &new);
2133 if (m == MATCH_ERROR)
2134 goto cleanup;
2135 if (m == MATCH_NO)
2136 goto syntax;
2137
2138 tail = gfc_append_code (tail, new);
2139 if (head == NULL)
2140 head = new;
2141
2142 if (gfc_match_eos () == MATCH_YES)
2143 break;
2144 if (gfc_match_char (',') != MATCH_YES)
2145 goto syntax;
2146 }
2147
2148 *head_p = head;
2149 return MATCH_YES;
2150
2151 syntax:
2152 gfc_error ("Syntax error in %s statement at %C", io_kind_name (k));
2153
2154 cleanup:
2155 gfc_free_statements (head);
2156 return MATCH_ERROR;
2157 }
2158
2159
2160 /* Attach the data transfer end node. */
2161
2162 static void
2163 terminate_io (gfc_code * io_code)
2164 {
2165 gfc_code *c;
2166
2167 if (io_code == NULL)
2168 io_code = new_st.block;
2169
2170 c = gfc_get_code ();
2171 c->op = EXEC_DT_END;
2172
2173 /* Point to structure that is already there */
2174 c->ext.dt = new_st.ext.dt;
2175 gfc_append_code (io_code, c);
2176 }
2177
2178
2179 /* Check the constraints for a data transfer statement. The majority of the
2180 constraints appearing in 9.4 of the standard appear here. Some are handled
2181 in resolve_tag and others in gfc_resolve_dt. */
2182
2183 static match
2184 check_io_constraints (io_kind k, gfc_dt *dt, gfc_code * io_code, locus * spec_end)
2185 {
2186 #define io_constraint(condition,msg,arg)\
2187 if (condition) \
2188 {\
2189 gfc_error(msg,arg);\
2190 m = MATCH_ERROR;\
2191 }
2192
2193 match m;
2194 gfc_expr * expr;
2195 gfc_symbol * sym = NULL;
2196
2197 m = MATCH_YES;
2198
2199 expr = dt->io_unit;
2200 if (expr && expr->expr_type == EXPR_VARIABLE
2201 && expr->ts.type == BT_CHARACTER)
2202 {
2203 sym = expr->symtree->n.sym;
2204
2205 io_constraint (k == M_WRITE && sym->attr.intent == INTENT_IN,
2206 "Internal file at %L must not be INTENT(IN)",
2207 &expr->where);
2208
2209 io_constraint (gfc_has_vector_index (dt->io_unit),
2210 "Internal file incompatible with vector subscript at %L",
2211 &expr->where);
2212
2213 io_constraint (dt->rec != NULL,
2214 "REC tag at %L is incompatible with internal file",
2215 &dt->rec->where);
2216
2217 io_constraint (dt->namelist != NULL,
2218 "Internal file at %L is incompatible with namelist",
2219 &expr->where);
2220
2221 io_constraint (dt->advance != NULL,
2222 "ADVANCE tag at %L is incompatible with internal file",
2223 &dt->advance->where);
2224 }
2225
2226 if (expr && expr->ts.type != BT_CHARACTER)
2227 {
2228
2229 io_constraint (gfc_pure (NULL)
2230 && (k == M_READ || k == M_WRITE),
2231 "IO UNIT in %s statement at %C must be "
2232 "an internal file in a PURE procedure",
2233 io_kind_name (k));
2234 }
2235
2236
2237 if (k != M_READ)
2238 {
2239 io_constraint (dt->end,
2240 "END tag not allowed with output at %L",
2241 &dt->end_where);
2242
2243 io_constraint (dt->eor,
2244 "EOR tag not allowed with output at %L",
2245 &dt->eor_where);
2246
2247 io_constraint (k != M_READ && dt->size,
2248 "SIZE=specifier not allowed with output at %L",
2249 &dt->size->where);
2250 }
2251 else
2252 {
2253 io_constraint (dt->size && dt->advance == NULL,
2254 "SIZE tag at %L requires an ADVANCE tag",
2255 &dt->size->where);
2256
2257 io_constraint (dt->eor && dt->advance == NULL,
2258 "EOR tag at %L requires an ADVANCE tag",
2259 &dt->eor_where);
2260 }
2261
2262
2263
2264 if (dt->namelist)
2265 {
2266 io_constraint (io_code && dt->namelist,
2267 "NAMELIST cannot be followed by IO-list at %L",
2268 &io_code->loc);
2269
2270 io_constraint (dt->format_expr,
2271 "IO spec-list cannot contain both NAMELIST group name "
2272 "and format specification at %L.",
2273 &dt->format_expr->where);
2274
2275 io_constraint (dt->format_label,
2276 "IO spec-list cannot contain both NAMELIST group name "
2277 "and format label at %L", spec_end);
2278
2279 io_constraint (dt->rec,
2280 "NAMELIST IO is not allowed with a REC=specifier "
2281 "at %L.", &dt->rec->where);
2282
2283 io_constraint (dt->advance,
2284 "NAMELIST IO is not allowed with a ADVANCE=specifier "
2285 "at %L.", &dt->advance->where);
2286 }
2287
2288 if (dt->rec)
2289 {
2290 io_constraint (dt->end,
2291 "An END tag is not allowed with a "
2292 "REC=specifier at %L.", &dt->end_where);
2293
2294
2295 io_constraint (dt->format_label == &format_asterisk,
2296 "FMT=* is not allowed with a REC=specifier "
2297 "at %L.", spec_end);
2298 }
2299
2300 if (dt->advance)
2301 {
2302 const char * advance;
2303 int not_yes, not_no;
2304 expr = dt->advance;
2305 advance = expr->value.character.string;
2306
2307 io_constraint (dt->format_label == &format_asterisk,
2308 "List directed format(*) is not allowed with a "
2309 "ADVANCE=specifier at %L.", &expr->where);
2310
2311 not_no = strncasecmp (advance, "no", 2) != 0;
2312 not_yes = strncasecmp (advance, "yes", 2) != 0;
2313
2314 io_constraint (expr->expr_type == EXPR_CONSTANT
2315 && not_no && not_yes,
2316 "ADVANCE=specifier at %L must have value = "
2317 "YES or NO.", &expr->where);
2318
2319 io_constraint (dt->size && expr->expr_type == EXPR_CONSTANT
2320 && not_no && k == M_READ,
2321 "SIZE tag at %L requires an ADVANCE = 'NO'",
2322 &dt->size->where);
2323
2324 io_constraint (dt->eor && expr->expr_type == EXPR_CONSTANT
2325 && not_no && k == M_READ,
2326 "EOR tag at %L requires an ADVANCE = 'NO'",
2327 &dt->eor_where);
2328 }
2329
2330 expr = dt->format_expr;
2331 if (expr != NULL && expr->expr_type == EXPR_CONSTANT)
2332 check_format_string (expr);
2333
2334 return m;
2335 }
2336 #undef io_constraint
2337
2338 /* Match a READ, WRITE or PRINT statement. */
2339
2340 static match
2341 match_io (io_kind k)
2342 {
2343 char name[GFC_MAX_SYMBOL_LEN + 1];
2344 gfc_code *io_code;
2345 gfc_symbol *sym;
2346 int comma_flag, c;
2347 locus where;
2348 locus spec_end;
2349 gfc_dt *dt;
2350 match m;
2351
2352 where = gfc_current_locus;
2353 comma_flag = 0;
2354 current_dt = dt = gfc_getmem (sizeof (gfc_dt));
2355 if (gfc_match_char ('(') == MATCH_NO)
2356 {
2357 where = gfc_current_locus;
2358 if (k == M_WRITE)
2359 goto syntax;
2360 else if (k == M_PRINT)
2361 {
2362 /* Treat the non-standard case of PRINT namelist. */
2363 if ((gfc_current_form == FORM_FIXED || gfc_peek_char () == ' ')
2364 && gfc_match_name (name) == MATCH_YES)
2365 {
2366 gfc_find_symbol (name, NULL, 1, &sym);
2367 if (sym && sym->attr.flavor == FL_NAMELIST)
2368 {
2369 if (gfc_notify_std (GFC_STD_GNU, "PRINT namelist at "
2370 "%C is an extension") == FAILURE)
2371 {
2372 m = MATCH_ERROR;
2373 goto cleanup;
2374 }
2375
2376 dt->io_unit = default_unit (k);
2377 dt->namelist = sym;
2378 goto get_io_list;
2379 }
2380 else
2381 gfc_current_locus = where;
2382 }
2383 }
2384
2385 if (gfc_current_form == FORM_FREE)
2386 {
2387 c = gfc_peek_char();
2388 if (c != ' ' && c != '*' && c != '\'' && c != '"')
2389 {
2390 m = MATCH_NO;
2391 goto cleanup;
2392 }
2393 }
2394
2395 m = match_dt_format (dt);
2396 if (m == MATCH_ERROR)
2397 goto cleanup;
2398 if (m == MATCH_NO)
2399 goto syntax;
2400
2401 comma_flag = 1;
2402 dt->io_unit = default_unit (k);
2403 goto get_io_list;
2404 }
2405
2406 /* Match a control list */
2407 if (match_dt_element (k, dt) == MATCH_YES)
2408 goto next;
2409 if (match_dt_unit (k, dt) != MATCH_YES)
2410 goto loop;
2411
2412 if (gfc_match_char (')') == MATCH_YES)
2413 goto get_io_list;
2414 if (gfc_match_char (',') != MATCH_YES)
2415 goto syntax;
2416
2417 m = match_dt_element (k, dt);
2418 if (m == MATCH_YES)
2419 goto next;
2420 if (m == MATCH_ERROR)
2421 goto cleanup;
2422
2423 m = match_dt_format (dt);
2424 if (m == MATCH_YES)
2425 goto next;
2426 if (m == MATCH_ERROR)
2427 goto cleanup;
2428
2429 where = gfc_current_locus;
2430
2431 m = gfc_match_name (name);
2432 if (m == MATCH_YES)
2433 {
2434 gfc_find_symbol (name, NULL, 1, &sym);
2435 if (sym && sym->attr.flavor == FL_NAMELIST)
2436 {
2437 dt->namelist = sym;
2438 if (k == M_READ && check_namelist (sym))
2439 {
2440 m = MATCH_ERROR;
2441 goto cleanup;
2442 }
2443 goto next;
2444 }
2445 }
2446
2447 gfc_current_locus = where;
2448
2449 goto loop; /* No matches, try regular elements */
2450
2451 next:
2452 if (gfc_match_char (')') == MATCH_YES)
2453 goto get_io_list;
2454 if (gfc_match_char (',') != MATCH_YES)
2455 goto syntax;
2456
2457 loop:
2458 for (;;)
2459 {
2460 m = match_dt_element (k, dt);
2461 if (m == MATCH_NO)
2462 goto syntax;
2463 if (m == MATCH_ERROR)
2464 goto cleanup;
2465
2466 if (gfc_match_char (')') == MATCH_YES)
2467 break;
2468 if (gfc_match_char (',') != MATCH_YES)
2469 goto syntax;
2470 }
2471
2472 get_io_list:
2473
2474 /* Used in check_io_constraints, where no locus is available. */
2475 spec_end = gfc_current_locus;
2476
2477 /* Optional leading comma (non-standard). */
2478 if (!comma_flag
2479 && gfc_match_char (',') == MATCH_YES
2480 && k == M_WRITE
2481 && gfc_notify_std (GFC_STD_GNU, "Extension: Comma before output "
2482 "item list at %C is an extension") == FAILURE)
2483 return MATCH_ERROR;
2484
2485 io_code = NULL;
2486 if (gfc_match_eos () != MATCH_YES)
2487 {
2488 if (comma_flag && gfc_match_char (',') != MATCH_YES)
2489 {
2490 gfc_error ("Expected comma in I/O list at %C");
2491 m = MATCH_ERROR;
2492 goto cleanup;
2493 }
2494
2495 m = match_io_list (k, &io_code);
2496 if (m == MATCH_ERROR)
2497 goto cleanup;
2498 if (m == MATCH_NO)
2499 goto syntax;
2500 }
2501
2502 /* A full IO statement has been matched. Check the constraints. spec_end is
2503 supplied for cases where no locus is supplied. */
2504 m = check_io_constraints (k, dt, io_code, &spec_end);
2505
2506 if (m == MATCH_ERROR)
2507 goto cleanup;
2508
2509 new_st.op = (k == M_READ) ? EXEC_READ : EXEC_WRITE;
2510 new_st.ext.dt = dt;
2511 new_st.block = gfc_get_code ();
2512 new_st.block->op = new_st.op;
2513 new_st.block->next = io_code;
2514
2515 terminate_io (io_code);
2516
2517 return MATCH_YES;
2518
2519 syntax:
2520 gfc_error ("Syntax error in %s statement at %C", io_kind_name (k));
2521 m = MATCH_ERROR;
2522
2523 cleanup:
2524 gfc_free_dt (dt);
2525 return m;
2526 }
2527
2528
2529 match
2530 gfc_match_read (void)
2531 {
2532 return match_io (M_READ);
2533 }
2534
2535 match
2536 gfc_match_write (void)
2537 {
2538 return match_io (M_WRITE);
2539 }
2540
2541 match
2542 gfc_match_print (void)
2543 {
2544 match m;
2545
2546 m = match_io (M_PRINT);
2547 if (m != MATCH_YES)
2548 return m;
2549
2550 if (gfc_pure (NULL))
2551 {
2552 gfc_error ("PRINT statement at %C not allowed within PURE procedure");
2553 return MATCH_ERROR;
2554 }
2555
2556 return MATCH_YES;
2557 }
2558
2559
2560 /* Free a gfc_inquire structure. */
2561
2562 void
2563 gfc_free_inquire (gfc_inquire * inquire)
2564 {
2565
2566 if (inquire == NULL)
2567 return;
2568
2569 gfc_free_expr (inquire->unit);
2570 gfc_free_expr (inquire->file);
2571 gfc_free_expr (inquire->iomsg);
2572 gfc_free_expr (inquire->iostat);
2573 gfc_free_expr (inquire->exist);
2574 gfc_free_expr (inquire->opened);
2575 gfc_free_expr (inquire->number);
2576 gfc_free_expr (inquire->named);
2577 gfc_free_expr (inquire->name);
2578 gfc_free_expr (inquire->access);
2579 gfc_free_expr (inquire->sequential);
2580 gfc_free_expr (inquire->direct);
2581 gfc_free_expr (inquire->form);
2582 gfc_free_expr (inquire->formatted);
2583 gfc_free_expr (inquire->unformatted);
2584 gfc_free_expr (inquire->recl);
2585 gfc_free_expr (inquire->nextrec);
2586 gfc_free_expr (inquire->blank);
2587 gfc_free_expr (inquire->position);
2588 gfc_free_expr (inquire->action);
2589 gfc_free_expr (inquire->read);
2590 gfc_free_expr (inquire->write);
2591 gfc_free_expr (inquire->readwrite);
2592 gfc_free_expr (inquire->delim);
2593 gfc_free_expr (inquire->pad);
2594 gfc_free_expr (inquire->iolength);
2595 gfc_free_expr (inquire->convert);
2596
2597 gfc_free (inquire);
2598 }
2599
2600
2601 /* Match an element of an INQUIRE statement. */
2602
2603 #define RETM if (m != MATCH_NO) return m;
2604
2605 static match
2606 match_inquire_element (gfc_inquire * inquire)
2607 {
2608 match m;
2609
2610 m = match_etag (&tag_unit, &inquire->unit);
2611 RETM m = match_etag (&tag_file, &inquire->file);
2612 RETM m = match_ltag (&tag_err, &inquire->err);
2613 RETM m = match_out_tag (&tag_iomsg, &inquire->iomsg);
2614 RETM m = match_out_tag (&tag_iostat, &inquire->iostat);
2615 RETM m = match_vtag (&tag_exist, &inquire->exist);
2616 RETM m = match_vtag (&tag_opened, &inquire->opened);
2617 RETM m = match_vtag (&tag_named, &inquire->named);
2618 RETM m = match_vtag (&tag_name, &inquire->name);
2619 RETM m = match_out_tag (&tag_number, &inquire->number);
2620 RETM m = match_vtag (&tag_s_access, &inquire->access);
2621 RETM m = match_vtag (&tag_sequential, &inquire->sequential);
2622 RETM m = match_vtag (&tag_direct, &inquire->direct);
2623 RETM m = match_vtag (&tag_s_form, &inquire->form);
2624 RETM m = match_vtag (&tag_formatted, &inquire->formatted);
2625 RETM m = match_vtag (&tag_unformatted, &inquire->unformatted);
2626 RETM m = match_out_tag (&tag_s_recl, &inquire->recl);
2627 RETM m = match_out_tag (&tag_nextrec, &inquire->nextrec);
2628 RETM m = match_vtag (&tag_s_blank, &inquire->blank);
2629 RETM m = match_vtag (&tag_s_position, &inquire->position);
2630 RETM m = match_vtag (&tag_s_action, &inquire->action);
2631 RETM m = match_vtag (&tag_read, &inquire->read);
2632 RETM m = match_vtag (&tag_write, &inquire->write);
2633 RETM m = match_vtag (&tag_readwrite, &inquire->readwrite);
2634 RETM m = match_vtag (&tag_s_delim, &inquire->delim);
2635 RETM m = match_vtag (&tag_s_pad, &inquire->pad);
2636 RETM m = match_vtag (&tag_iolength, &inquire->iolength);
2637 RETM m = match_vtag (&tag_convert, &inquire->convert);
2638 RETM return MATCH_NO;
2639 }
2640
2641 #undef RETM
2642
2643
2644 match
2645 gfc_match_inquire (void)
2646 {
2647 gfc_inquire *inquire;
2648 gfc_code *code;
2649 match m;
2650 locus loc;
2651
2652 m = gfc_match_char ('(');
2653 if (m == MATCH_NO)
2654 return m;
2655
2656 inquire = gfc_getmem (sizeof (gfc_inquire));
2657
2658 loc = gfc_current_locus;
2659
2660 m = match_inquire_element (inquire);
2661 if (m == MATCH_ERROR)
2662 goto cleanup;
2663 if (m == MATCH_NO)
2664 {
2665 m = gfc_match_expr (&inquire->unit);
2666 if (m == MATCH_ERROR)
2667 goto cleanup;
2668 if (m == MATCH_NO)
2669 goto syntax;
2670 }
2671
2672 /* See if we have the IOLENGTH form of the inquire statement. */
2673 if (inquire->iolength != NULL)
2674 {
2675 if (gfc_match_char (')') != MATCH_YES)
2676 goto syntax;
2677
2678 m = match_io_list (M_INQUIRE, &code);
2679 if (m == MATCH_ERROR)
2680 goto cleanup;
2681 if (m == MATCH_NO)
2682 goto syntax;
2683
2684 new_st.op = EXEC_IOLENGTH;
2685 new_st.expr = inquire->iolength;
2686 new_st.ext.inquire = inquire;
2687
2688 if (gfc_pure (NULL))
2689 {
2690 gfc_free_statements (code);
2691 gfc_error ("INQUIRE statement not allowed in PURE procedure at %C");
2692 return MATCH_ERROR;
2693 }
2694
2695 new_st.block = gfc_get_code ();
2696 new_st.block->op = EXEC_IOLENGTH;
2697 terminate_io (code);
2698 new_st.block->next = code;
2699 return MATCH_YES;
2700 }
2701
2702 /* At this point, we have the non-IOLENGTH inquire statement. */
2703 for (;;)
2704 {
2705 if (gfc_match_char (')') == MATCH_YES)
2706 break;
2707 if (gfc_match_char (',') != MATCH_YES)
2708 goto syntax;
2709
2710 m = match_inquire_element (inquire);
2711 if (m == MATCH_ERROR)
2712 goto cleanup;
2713 if (m == MATCH_NO)
2714 goto syntax;
2715
2716 if (inquire->iolength != NULL)
2717 {
2718 gfc_error ("IOLENGTH tag invalid in INQUIRE statement at %C");
2719 goto cleanup;
2720 }
2721 }
2722
2723 if (gfc_match_eos () != MATCH_YES)
2724 goto syntax;
2725
2726 if (inquire->unit != NULL && inquire->file != NULL)
2727 {
2728 gfc_error ("INQUIRE statement at %L cannot contain both FILE and"
2729 " UNIT specifiers", &loc);
2730 goto cleanup;
2731 }
2732
2733 if (inquire->unit == NULL && inquire->file == NULL)
2734 {
2735 gfc_error ("INQUIRE statement at %L requires either FILE or"
2736 " UNIT specifier", &loc);
2737 goto cleanup;
2738 }
2739
2740 if (gfc_pure (NULL))
2741 {
2742 gfc_error ("INQUIRE statement not allowed in PURE procedure at %C");
2743 goto cleanup;
2744 }
2745
2746 new_st.op = EXEC_INQUIRE;
2747 new_st.ext.inquire = inquire;
2748 return MATCH_YES;
2749
2750 syntax:
2751 gfc_syntax_error (ST_INQUIRE);
2752
2753 cleanup:
2754 gfc_free_inquire (inquire);
2755 return MATCH_ERROR;
2756 }
2757
2758
2759 /* Resolve everything in a gfc_inquire structure. */
2760
2761 try
2762 gfc_resolve_inquire (gfc_inquire * inquire)
2763 {
2764
2765 RESOLVE_TAG (&tag_unit, inquire->unit);
2766 RESOLVE_TAG (&tag_file, inquire->file);
2767 RESOLVE_TAG (&tag_iomsg, inquire->iomsg);
2768 RESOLVE_TAG (&tag_iostat, inquire->iostat);
2769 RESOLVE_TAG (&tag_exist, inquire->exist);
2770 RESOLVE_TAG (&tag_opened, inquire->opened);
2771 RESOLVE_TAG (&tag_number, inquire->number);
2772 RESOLVE_TAG (&tag_named, inquire->named);
2773 RESOLVE_TAG (&tag_name, inquire->name);
2774 RESOLVE_TAG (&tag_s_access, inquire->access);
2775 RESOLVE_TAG (&tag_sequential, inquire->sequential);
2776 RESOLVE_TAG (&tag_direct, inquire->direct);
2777 RESOLVE_TAG (&tag_s_form, inquire->form);
2778 RESOLVE_TAG (&tag_formatted, inquire->formatted);
2779 RESOLVE_TAG (&tag_unformatted, inquire->unformatted);
2780 RESOLVE_TAG (&tag_s_recl, inquire->recl);
2781 RESOLVE_TAG (&tag_nextrec, inquire->nextrec);
2782 RESOLVE_TAG (&tag_s_blank, inquire->blank);
2783 RESOLVE_TAG (&tag_s_position, inquire->position);
2784 RESOLVE_TAG (&tag_s_action, inquire->action);
2785 RESOLVE_TAG (&tag_read, inquire->read);
2786 RESOLVE_TAG (&tag_write, inquire->write);
2787 RESOLVE_TAG (&tag_readwrite, inquire->readwrite);
2788 RESOLVE_TAG (&tag_s_delim, inquire->delim);
2789 RESOLVE_TAG (&tag_s_pad, inquire->pad);
2790 RESOLVE_TAG (&tag_iolength, inquire->iolength);
2791 RESOLVE_TAG (&tag_convert, inquire->convert);
2792
2793 if (gfc_reference_st_label (inquire->err, ST_LABEL_TARGET) == FAILURE)
2794 return FAILURE;
2795
2796 return SUCCESS;
2797 }
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