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