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gfortran.texi: Add link to GFortran apps
[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
1257 /* Check if a given value for a SPECIFIER is either in the list of values
1258 allowed in F95 or F2003, issuing an error message and returning a zero
1259 value if it is not allowed. */
1260 static int
1261 compare_to_allowed_values (const char * specifier, const char * allowed[],
1262 const char * allowed_f2003[],
1263 const char * allowed_gnu[], char * value,
1264 const char * statement, bool warn)
1265 {
1266 int i;
1267 unsigned int len;
1268
1269 len = strlen(value);
1270 if (len > 0)
1271 {
1272 for (len--; len > 0; len--)
1273 if (value[len] != ' ')
1274 break;
1275 len++;
1276 }
1277
1278 for (i = 0; allowed[i]; i++)
1279 if (len == strlen(allowed[i])
1280 && strncasecmp (value, allowed[i], strlen(allowed[i])) == 0)
1281 return 1;
1282
1283 for (i = 0; allowed_f2003 && allowed_f2003[i]; i++)
1284 if (len == strlen(allowed_f2003[i])
1285 && strncasecmp (value, allowed_f2003[i], strlen(allowed_f2003[i])) == 0)
1286 {
1287 notification n = gfc_notification_std (GFC_STD_F2003);
1288
1289 if (n == WARNING || (warn && n == ERROR))
1290 {
1291 gfc_warning ("Fortran 2003: %s specifier in %s statement at %C "
1292 "has value '%s'", specifier, statement,
1293 allowed_f2003[i]);
1294 return 1;
1295 }
1296 else
1297 if (n == ERROR)
1298 {
1299 gfc_notify_std (GFC_STD_F2003, "Fortran 2003: %s specifier in "
1300 "%s statement at %C has value '%s'", specifier,
1301 statement, allowed_f2003[i]);
1302 return 0;
1303 }
1304
1305 /* n == SILENT */
1306 return 1;
1307 }
1308
1309 for (i = 0; allowed_gnu && allowed_gnu[i]; i++)
1310 if (len == strlen(allowed_gnu[i])
1311 && strncasecmp (value, allowed_gnu[i], strlen(allowed_gnu[i])) == 0)
1312 {
1313 notification n = gfc_notification_std (GFC_STD_GNU);
1314
1315 if (n == WARNING || (warn && n == ERROR))
1316 {
1317 gfc_warning ("Extension: %s specifier in %s statement at %C "
1318 "has value '%s'", specifier, statement,
1319 allowed_gnu[i]);
1320 return 1;
1321 }
1322 else
1323 if (n == ERROR)
1324 {
1325 gfc_notify_std (GFC_STD_GNU, "Extension: %s specifier in "
1326 "%s statement at %C has value '%s'", specifier,
1327 statement, allowed_gnu[i]);
1328 return 0;
1329 }
1330
1331 /* n == SILENT */
1332 return 1;
1333 }
1334
1335 if (warn)
1336 {
1337 gfc_warning ("%s specifier in %s statement at %C has invalid value '%s'",
1338 specifier, statement, value);
1339 return 1;
1340 }
1341 else
1342 {
1343 gfc_error ("%s specifier in %s statement at %C has invalid value '%s'",
1344 specifier, statement, value);
1345 return 0;
1346 }
1347 }
1348
1349 /* Match an OPEN statement. */
1350
1351 match
1352 gfc_match_open (void)
1353 {
1354 gfc_open *open;
1355 match m;
1356 bool warn;
1357
1358 m = gfc_match_char ('(');
1359 if (m == MATCH_NO)
1360 return m;
1361
1362 open = gfc_getmem (sizeof (gfc_open));
1363
1364 m = match_open_element (open);
1365
1366 if (m == MATCH_ERROR)
1367 goto cleanup;
1368 if (m == MATCH_NO)
1369 {
1370 m = gfc_match_expr (&open->unit);
1371 if (m == MATCH_NO)
1372 goto syntax;
1373 if (m == MATCH_ERROR)
1374 goto cleanup;
1375 }
1376
1377 for (;;)
1378 {
1379 if (gfc_match_char (')') == MATCH_YES)
1380 break;
1381 if (gfc_match_char (',') != MATCH_YES)
1382 goto syntax;
1383
1384 m = match_open_element (open);
1385 if (m == MATCH_ERROR)
1386 goto cleanup;
1387 if (m == MATCH_NO)
1388 goto syntax;
1389 }
1390
1391 if (gfc_match_eos () == MATCH_NO)
1392 goto syntax;
1393
1394 if (gfc_pure (NULL))
1395 {
1396 gfc_error ("OPEN statement not allowed in PURE procedure at %C");
1397 goto cleanup;
1398 }
1399
1400 warn = (open->err || open->iostat) ? true : false;
1401 /* Checks on the ACCESS specifier. */
1402 if (open->access && open->access->expr_type == EXPR_CONSTANT)
1403 {
1404 static const char * access_f95[] = { "SEQUENTIAL", "DIRECT", NULL };
1405 static const char * access_f2003[] = { "STREAM", NULL };
1406 static const char * access_gnu[] = { "APPEND", NULL };
1407
1408 if (!compare_to_allowed_values ("ACCESS", access_f95, access_f2003,
1409 access_gnu,
1410 open->access->value.character.string,
1411 "OPEN", warn))
1412 goto cleanup;
1413 }
1414
1415 /* Checks on the ACTION specifier. */
1416 if (open->action && open->action->expr_type == EXPR_CONSTANT)
1417 {
1418 static const char * action[] = { "READ", "WRITE", "READWRITE", NULL };
1419
1420 if (!compare_to_allowed_values ("ACTION", action, NULL, NULL,
1421 open->action->value.character.string,
1422 "OPEN", warn))
1423 goto cleanup;
1424 }
1425
1426 /* Checks on the ASYNCHRONOUS specifier. */
1427 /* TODO: code is ready, just needs uncommenting when async I/O support
1428 is added ;-)
1429 if (open->asynchronous && open->asynchronous->expr_type == EXPR_CONSTANT)
1430 {
1431 static const char * asynchronous[] = { "YES", "NO", NULL };
1432
1433 if (!compare_to_allowed_values
1434 ("action", asynchronous, NULL, NULL,
1435 open->asynchronous->value.character.string, "OPEN", warn))
1436 goto cleanup;
1437 }*/
1438
1439 /* Checks on the BLANK specifier. */
1440 if (open->blank && open->blank->expr_type == EXPR_CONSTANT)
1441 {
1442 static const char * blank[] = { "ZERO", "NULL", NULL };
1443
1444 if (!compare_to_allowed_values ("BLANK", blank, NULL, NULL,
1445 open->blank->value.character.string,
1446 "OPEN", warn))
1447 goto cleanup;
1448 }
1449
1450 /* Checks on the DECIMAL specifier. */
1451 /* TODO: uncomment this code when DECIMAL support is added
1452 if (open->decimal && open->decimal->expr_type == EXPR_CONSTANT)
1453 {
1454 static const char * decimal[] = { "COMMA", "POINT", NULL };
1455
1456 if (!compare_to_allowed_values ("DECIMAL", decimal, NULL, NULL,
1457 open->decimal->value.character.string,
1458 "OPEN", warn))
1459 goto cleanup;
1460 } */
1461
1462 /* Checks on the DELIM specifier. */
1463 if (open->delim && open->delim->expr_type == EXPR_CONSTANT)
1464 {
1465 static const char * delim[] = { "APOSTROPHE", "QUOTE", "NONE", NULL };
1466
1467 if (!compare_to_allowed_values ("DELIM", delim, NULL, NULL,
1468 open->delim->value.character.string,
1469 "OPEN", warn))
1470 goto cleanup;
1471 }
1472
1473 /* Checks on the ENCODING specifier. */
1474 /* TODO: uncomment this code when ENCODING support is added
1475 if (open->encoding && open->encoding->expr_type == EXPR_CONSTANT)
1476 {
1477 static const char * encoding[] = { "UTF-8", "DEFAULT", NULL };
1478
1479 if (!compare_to_allowed_values ("ENCODING", encoding, NULL, NULL,
1480 open->encoding->value.character.string,
1481 "OPEN", warn))
1482 goto cleanup;
1483 } */
1484
1485 /* Checks on the FORM specifier. */
1486 if (open->form && open->form->expr_type == EXPR_CONSTANT)
1487 {
1488 static const char * form[] = { "FORMATTED", "UNFORMATTED", NULL };
1489
1490 if (!compare_to_allowed_values ("FORM", form, NULL, NULL,
1491 open->form->value.character.string,
1492 "OPEN", warn))
1493 goto cleanup;
1494 }
1495
1496 /* Checks on the PAD specifier. */
1497 if (open->pad && open->pad->expr_type == EXPR_CONSTANT)
1498 {
1499 static const char * pad[] = { "YES", "NO", NULL };
1500
1501 if (!compare_to_allowed_values ("PAD", pad, NULL, NULL,
1502 open->pad->value.character.string,
1503 "OPEN", warn))
1504 goto cleanup;
1505 }
1506
1507 /* Checks on the POSITION specifier. */
1508 if (open->position && open->position->expr_type == EXPR_CONSTANT)
1509 {
1510 static const char * position[] = { "ASIS", "REWIND", "APPEND", NULL };
1511
1512 if (!compare_to_allowed_values ("POSITION", position, NULL, NULL,
1513 open->position->value.character.string,
1514 "OPEN", warn))
1515 goto cleanup;
1516 }
1517
1518 /* Checks on the ROUND specifier. */
1519 /* TODO: uncomment this code when ROUND support is added
1520 if (open->round && open->round->expr_type == EXPR_CONSTANT)
1521 {
1522 static const char * round[] = { "UP", "DOWN", "ZERO", "NEAREST",
1523 "COMPATIBLE", "PROCESSOR_DEFINED", NULL };
1524
1525 if (!compare_to_allowed_values ("ROUND", round, NULL, NULL,
1526 open->round->value.character.string,
1527 "OPEN", warn))
1528 goto cleanup;
1529 } */
1530
1531 /* Checks on the SIGN specifier. */
1532 /* TODO: uncomment this code when SIGN support is added
1533 if (open->sign && open->sign->expr_type == EXPR_CONSTANT)
1534 {
1535 static const char * sign[] = { "PLUS", "SUPPRESS", "PROCESSOR_DEFINED",
1536 NULL };
1537
1538 if (!compare_to_allowed_values ("SIGN", sign, NULL, NULL,
1539 open->sign->value.character.string,
1540 "OPEN", warn))
1541 goto cleanup;
1542 } */
1543
1544 #define warn_or_error(...) \
1545 { \
1546 if (warn) \
1547 gfc_warning (__VA_ARGS__); \
1548 else \
1549 { \
1550 gfc_error (__VA_ARGS__); \
1551 goto cleanup; \
1552 } \
1553 }
1554
1555 /* Checks on the RECL specifier. */
1556 if (open->recl && open->recl->expr_type == EXPR_CONSTANT
1557 && open->recl->ts.type == BT_INTEGER
1558 && mpz_sgn (open->recl->value.integer) != 1)
1559 {
1560 warn_or_error ("RECL in OPEN statement at %C must be positive");
1561 }
1562
1563 /* Checks on the STATUS specifier. */
1564 if (open->status && open->status->expr_type == EXPR_CONSTANT)
1565 {
1566 static const char * status[] = { "OLD", "NEW", "SCRATCH",
1567 "REPLACE", "UNKNOWN", NULL };
1568
1569 if (!compare_to_allowed_values ("STATUS", status, NULL, NULL,
1570 open->status->value.character.string,
1571 "OPEN", warn))
1572 goto cleanup;
1573
1574 /* F2003, 9.4.5: If the STATUS= specifier has the value NEW or REPLACE,
1575 the FILE= specifier shall appear. */
1576 if (open->file == NULL &&
1577 (strncasecmp (open->status->value.character.string, "replace", 7) == 0
1578 || strncasecmp (open->status->value.character.string, "new", 3) == 0))
1579 {
1580 warn_or_error ("The STATUS specified in OPEN statement at %C is '%s' "
1581 "and no FILE specifier is present",
1582 open->status->value.character.string);
1583 }
1584
1585 /* F2003, 9.4.5: If the STATUS= specifier has the value SCRATCH,
1586 the FILE= specifier shall not appear. */
1587 if (strncasecmp (open->status->value.character.string, "scratch", 7) == 0
1588 && open->file)
1589 {
1590 warn_or_error ("The STATUS specified in OPEN statement at %C cannot "
1591 "have the value SCRATCH if a FILE specifier "
1592 "is present");
1593 }
1594 }
1595
1596 /* Things that are not allowed for unformatted I/O. */
1597 if (open->form && open->form->expr_type == EXPR_CONSTANT
1598 && (open->delim
1599 /* TODO uncomment this code when F2003 support is finished */
1600 /* || open->decimal || open->encoding || open->round
1601 || open->sign */
1602 || open->pad || open->blank)
1603 && strncasecmp (open->form->value.character.string,
1604 "unformatted", 11) == 0)
1605 {
1606 const char * spec = (open->delim ? "DELIM " : (open->pad ? "PAD " :
1607 open->blank ? "BLANK " : ""));
1608
1609 warn_or_error ("%sspecifier at %C not allowed in OPEN statement for "
1610 "unformatted I/O", spec);
1611 }
1612
1613 if (open->recl && open->access && open->access->expr_type == EXPR_CONSTANT
1614 && strncasecmp (open->access->value.character.string, "stream", 6) == 0)
1615 {
1616 warn_or_error ("RECL specifier not allowed in OPEN statement at %C for "
1617 "stream I/O");
1618 }
1619
1620 if (open->position && open->access && open->access->expr_type == EXPR_CONSTANT
1621 && !(strncasecmp (open->access->value.character.string,
1622 "sequential", 10) == 0
1623 || strncasecmp (open->access->value.character.string,
1624 "stream", 6) == 0
1625 || strncasecmp (open->access->value.character.string,
1626 "append", 6) == 0))
1627 {
1628 warn_or_error ("POSITION specifier in OPEN statement at %C only allowed "
1629 "for stream or sequential ACCESS");
1630 }
1631
1632 #undef warn_or_error
1633
1634 new_st.op = EXEC_OPEN;
1635 new_st.ext.open = open;
1636 return MATCH_YES;
1637
1638 syntax:
1639 gfc_syntax_error (ST_OPEN);
1640
1641 cleanup:
1642 gfc_free_open (open);
1643 return MATCH_ERROR;
1644 }
1645
1646
1647 /* Free a gfc_close structure an all its expressions. */
1648
1649 void
1650 gfc_free_close (gfc_close * close)
1651 {
1652
1653 if (close == NULL)
1654 return;
1655
1656 gfc_free_expr (close->unit);
1657 gfc_free_expr (close->iomsg);
1658 gfc_free_expr (close->iostat);
1659 gfc_free_expr (close->status);
1660
1661 gfc_free (close);
1662 }
1663
1664
1665 /* Match elements of a CLOSE statement. */
1666
1667 static match
1668 match_close_element (gfc_close * close)
1669 {
1670 match m;
1671
1672 m = match_etag (&tag_unit, &close->unit);
1673 if (m != MATCH_NO)
1674 return m;
1675 m = match_etag (&tag_status, &close->status);
1676 if (m != MATCH_NO)
1677 return m;
1678 m = match_out_tag (&tag_iomsg, &close->iomsg);
1679 if (m != MATCH_NO)
1680 return m;
1681 m = match_out_tag (&tag_iostat, &close->iostat);
1682 if (m != MATCH_NO)
1683 return m;
1684 m = match_ltag (&tag_err, &close->err);
1685 if (m != MATCH_NO)
1686 return m;
1687
1688 return MATCH_NO;
1689 }
1690
1691
1692 /* Match a CLOSE statement. */
1693
1694 match
1695 gfc_match_close (void)
1696 {
1697 gfc_close *close;
1698 match m;
1699 bool warn;
1700
1701 m = gfc_match_char ('(');
1702 if (m == MATCH_NO)
1703 return m;
1704
1705 close = gfc_getmem (sizeof (gfc_close));
1706
1707 m = match_close_element (close);
1708
1709 if (m == MATCH_ERROR)
1710 goto cleanup;
1711 if (m == MATCH_NO)
1712 {
1713 m = gfc_match_expr (&close->unit);
1714 if (m == MATCH_NO)
1715 goto syntax;
1716 if (m == MATCH_ERROR)
1717 goto cleanup;
1718 }
1719
1720 for (;;)
1721 {
1722 if (gfc_match_char (')') == MATCH_YES)
1723 break;
1724 if (gfc_match_char (',') != MATCH_YES)
1725 goto syntax;
1726
1727 m = match_close_element (close);
1728 if (m == MATCH_ERROR)
1729 goto cleanup;
1730 if (m == MATCH_NO)
1731 goto syntax;
1732 }
1733
1734 if (gfc_match_eos () == MATCH_NO)
1735 goto syntax;
1736
1737 if (gfc_pure (NULL))
1738 {
1739 gfc_error ("CLOSE statement not allowed in PURE procedure at %C");
1740 goto cleanup;
1741 }
1742
1743 warn = (close->iostat || close->err) ? true : false;
1744
1745 /* Checks on the STATUS specifier. */
1746 if (close->status && close->status->expr_type == EXPR_CONSTANT)
1747 {
1748 static const char * status[] = { "KEEP", "DELETE" };
1749
1750 if (!compare_to_allowed_values ("STATUS", status, NULL, NULL,
1751 close->status->value.character.string,
1752 "CLOSE", warn))
1753 goto cleanup;
1754 }
1755
1756 new_st.op = EXEC_CLOSE;
1757 new_st.ext.close = close;
1758 return MATCH_YES;
1759
1760 syntax:
1761 gfc_syntax_error (ST_CLOSE);
1762
1763 cleanup:
1764 gfc_free_close (close);
1765 return MATCH_ERROR;
1766 }
1767
1768
1769 /* Resolve everything in a gfc_close structure. */
1770
1771 try
1772 gfc_resolve_close (gfc_close * close)
1773 {
1774
1775 RESOLVE_TAG (&tag_unit, close->unit);
1776 RESOLVE_TAG (&tag_iomsg, close->iomsg);
1777 RESOLVE_TAG (&tag_iostat, close->iostat);
1778 RESOLVE_TAG (&tag_status, close->status);
1779
1780 if (gfc_reference_st_label (close->err, ST_LABEL_TARGET) == FAILURE)
1781 return FAILURE;
1782
1783 return SUCCESS;
1784 }
1785
1786
1787 /* Free a gfc_filepos structure. */
1788
1789 void
1790 gfc_free_filepos (gfc_filepos * fp)
1791 {
1792
1793 gfc_free_expr (fp->unit);
1794 gfc_free_expr (fp->iomsg);
1795 gfc_free_expr (fp->iostat);
1796 gfc_free (fp);
1797 }
1798
1799
1800 /* Match elements of a REWIND, BACKSPACE, ENDFILE, or FLUSH statement. */
1801
1802 static match
1803 match_file_element (gfc_filepos * fp)
1804 {
1805 match m;
1806
1807 m = match_etag (&tag_unit, &fp->unit);
1808 if (m != MATCH_NO)
1809 return m;
1810 m = match_out_tag (&tag_iomsg, &fp->iomsg);
1811 if (m != MATCH_NO)
1812 return m;
1813 m = match_out_tag (&tag_iostat, &fp->iostat);
1814 if (m != MATCH_NO)
1815 return m;
1816 m = match_ltag (&tag_err, &fp->err);
1817 if (m != MATCH_NO)
1818 return m;
1819
1820 return MATCH_NO;
1821 }
1822
1823
1824 /* Match the second half of the file-positioning statements, REWIND,
1825 BACKSPACE, ENDFILE, or the FLUSH statement. */
1826
1827 static match
1828 match_filepos (gfc_statement st, gfc_exec_op op)
1829 {
1830 gfc_filepos *fp;
1831 match m;
1832
1833 fp = gfc_getmem (sizeof (gfc_filepos));
1834
1835 if (gfc_match_char ('(') == MATCH_NO)
1836 {
1837 m = gfc_match_expr (&fp->unit);
1838 if (m == MATCH_ERROR)
1839 goto cleanup;
1840 if (m == MATCH_NO)
1841 goto syntax;
1842
1843 goto done;
1844 }
1845
1846 m = match_file_element (fp);
1847 if (m == MATCH_ERROR)
1848 goto done;
1849 if (m == MATCH_NO)
1850 {
1851 m = gfc_match_expr (&fp->unit);
1852 if (m == MATCH_ERROR)
1853 goto done;
1854 if (m == MATCH_NO)
1855 goto syntax;
1856 }
1857
1858 for (;;)
1859 {
1860 if (gfc_match_char (')') == MATCH_YES)
1861 break;
1862 if (gfc_match_char (',') != MATCH_YES)
1863 goto syntax;
1864
1865 m = match_file_element (fp);
1866 if (m == MATCH_ERROR)
1867 goto cleanup;
1868 if (m == MATCH_NO)
1869 goto syntax;
1870 }
1871
1872 done:
1873 if (gfc_match_eos () != MATCH_YES)
1874 goto syntax;
1875
1876 if (gfc_pure (NULL))
1877 {
1878 gfc_error ("%s statement not allowed in PURE procedure at %C",
1879 gfc_ascii_statement (st));
1880
1881 goto cleanup;
1882 }
1883
1884 new_st.op = op;
1885 new_st.ext.filepos = fp;
1886 return MATCH_YES;
1887
1888 syntax:
1889 gfc_syntax_error (st);
1890
1891 cleanup:
1892 gfc_free_filepos (fp);
1893 return MATCH_ERROR;
1894 }
1895
1896
1897 try
1898 gfc_resolve_filepos (gfc_filepos * fp)
1899 {
1900
1901 RESOLVE_TAG (&tag_unit, fp->unit);
1902 RESOLVE_TAG (&tag_iostat, fp->iostat);
1903 RESOLVE_TAG (&tag_iomsg, fp->iomsg);
1904 if (gfc_reference_st_label (fp->err, ST_LABEL_TARGET) == FAILURE)
1905 return FAILURE;
1906
1907 return SUCCESS;
1908 }
1909
1910
1911 /* Match the file positioning statements: ENDFILE, BACKSPACE, REWIND,
1912 and the FLUSH statement. */
1913
1914 match
1915 gfc_match_endfile (void)
1916 {
1917
1918 return match_filepos (ST_END_FILE, EXEC_ENDFILE);
1919 }
1920
1921 match
1922 gfc_match_backspace (void)
1923 {
1924
1925 return match_filepos (ST_BACKSPACE, EXEC_BACKSPACE);
1926 }
1927
1928 match
1929 gfc_match_rewind (void)
1930 {
1931
1932 return match_filepos (ST_REWIND, EXEC_REWIND);
1933 }
1934
1935 match
1936 gfc_match_flush (void)
1937 {
1938 if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: FLUSH statement at %C") == FAILURE)
1939 return MATCH_ERROR;
1940
1941 return match_filepos (ST_FLUSH, EXEC_FLUSH);
1942 }
1943
1944 /******************** Data Transfer Statements *********************/
1945
1946 typedef enum
1947 { M_READ, M_WRITE, M_PRINT, M_INQUIRE }
1948 io_kind;
1949
1950
1951 /* Return a default unit number. */
1952
1953 static gfc_expr *
1954 default_unit (io_kind k)
1955 {
1956 int unit;
1957
1958 if (k == M_READ)
1959 unit = 5;
1960 else
1961 unit = 6;
1962
1963 return gfc_int_expr (unit);
1964 }
1965
1966
1967 /* Match a unit specification for a data transfer statement. */
1968
1969 static match
1970 match_dt_unit (io_kind k, gfc_dt * dt)
1971 {
1972 gfc_expr *e;
1973
1974 if (gfc_match_char ('*') == MATCH_YES)
1975 {
1976 if (dt->io_unit != NULL)
1977 goto conflict;
1978
1979 dt->io_unit = default_unit (k);
1980 return MATCH_YES;
1981 }
1982
1983 if (gfc_match_expr (&e) == MATCH_YES)
1984 {
1985 if (dt->io_unit != NULL)
1986 {
1987 gfc_free_expr (e);
1988 goto conflict;
1989 }
1990
1991 dt->io_unit = e;
1992 return MATCH_YES;
1993 }
1994
1995 return MATCH_NO;
1996
1997 conflict:
1998 gfc_error ("Duplicate UNIT specification at %C");
1999 return MATCH_ERROR;
2000 }
2001
2002
2003 /* Match a format specification. */
2004
2005 static match
2006 match_dt_format (gfc_dt * dt)
2007 {
2008 locus where;
2009 gfc_expr *e;
2010 gfc_st_label *label;
2011
2012 where = gfc_current_locus;
2013
2014 if (gfc_match_char ('*') == MATCH_YES)
2015 {
2016 if (dt->format_expr != NULL || dt->format_label != NULL)
2017 goto conflict;
2018
2019 dt->format_label = &format_asterisk;
2020 return MATCH_YES;
2021 }
2022
2023 if (gfc_match_st_label (&label) == MATCH_YES)
2024 {
2025 if (dt->format_expr != NULL || dt->format_label != NULL)
2026 {
2027 gfc_free_st_label (label);
2028 goto conflict;
2029 }
2030
2031 if (gfc_reference_st_label (label, ST_LABEL_FORMAT) == FAILURE)
2032 return MATCH_ERROR;
2033
2034 dt->format_label = label;
2035 return MATCH_YES;
2036 }
2037
2038 if (gfc_match_expr (&e) == MATCH_YES)
2039 {
2040 if (dt->format_expr != NULL || dt->format_label != NULL)
2041 {
2042 gfc_free_expr (e);
2043 goto conflict;
2044 }
2045 dt->format_expr = e;
2046 return MATCH_YES;
2047 }
2048
2049 gfc_current_locus = where; /* The only case where we have to restore */
2050
2051 return MATCH_NO;
2052
2053 conflict:
2054 gfc_error ("Duplicate format specification at %C");
2055 return MATCH_ERROR;
2056 }
2057
2058
2059 /* Traverse a namelist that is part of a READ statement to make sure
2060 that none of the variables in the namelist are INTENT(IN). Returns
2061 nonzero if we find such a variable. */
2062
2063 static int
2064 check_namelist (gfc_symbol * sym)
2065 {
2066 gfc_namelist *p;
2067
2068 for (p = sym->namelist; p; p = p->next)
2069 if (p->sym->attr.intent == INTENT_IN)
2070 {
2071 gfc_error ("Symbol '%s' in namelist '%s' is INTENT(IN) at %C",
2072 p->sym->name, sym->name);
2073 return 1;
2074 }
2075
2076 return 0;
2077 }
2078
2079
2080 /* Match a single data transfer element. */
2081
2082 static match
2083 match_dt_element (io_kind k, gfc_dt * dt)
2084 {
2085 char name[GFC_MAX_SYMBOL_LEN + 1];
2086 gfc_symbol *sym;
2087 match m;
2088
2089 if (gfc_match (" unit =") == MATCH_YES)
2090 {
2091 m = match_dt_unit (k, dt);
2092 if (m != MATCH_NO)
2093 return m;
2094 }
2095
2096 if (gfc_match (" fmt =") == MATCH_YES)
2097 {
2098 m = match_dt_format (dt);
2099 if (m != MATCH_NO)
2100 return m;
2101 }
2102
2103 if (gfc_match (" nml = %n", name) == MATCH_YES)
2104 {
2105 if (dt->namelist != NULL)
2106 {
2107 gfc_error ("Duplicate NML specification at %C");
2108 return MATCH_ERROR;
2109 }
2110
2111 if (gfc_find_symbol (name, NULL, 1, &sym))
2112 return MATCH_ERROR;
2113
2114 if (sym == NULL || sym->attr.flavor != FL_NAMELIST)
2115 {
2116 gfc_error ("Symbol '%s' at %C must be a NAMELIST group name",
2117 sym != NULL ? sym->name : name);
2118 return MATCH_ERROR;
2119 }
2120
2121 dt->namelist = sym;
2122 if (k == M_READ && check_namelist (sym))
2123 return MATCH_ERROR;
2124
2125 return MATCH_YES;
2126 }
2127
2128 m = match_etag (&tag_rec, &dt->rec);
2129 if (m != MATCH_NO)
2130 return m;
2131 m = match_etag (&tag_spos, &dt->rec);
2132 if (m != MATCH_NO)
2133 return m;
2134 m = match_out_tag (&tag_iomsg, &dt->iomsg);
2135 if (m != MATCH_NO)
2136 return m;
2137 m = match_out_tag (&tag_iostat, &dt->iostat);
2138 if (m != MATCH_NO)
2139 return m;
2140 m = match_ltag (&tag_err, &dt->err);
2141 if (m == MATCH_YES)
2142 dt->err_where = gfc_current_locus;
2143 if (m != MATCH_NO)
2144 return m;
2145 m = match_etag (&tag_advance, &dt->advance);
2146 if (m != MATCH_NO)
2147 return m;
2148 m = match_out_tag (&tag_size, &dt->size);
2149 if (m != MATCH_NO)
2150 return m;
2151
2152 m = match_ltag (&tag_end, &dt->end);
2153 if (m == MATCH_YES)
2154 {
2155 if (k == M_WRITE)
2156 {
2157 gfc_error ("END tag at %C not allowed in output statement");
2158 return MATCH_ERROR;
2159 }
2160 dt->end_where = gfc_current_locus;
2161 }
2162 if (m != MATCH_NO)
2163 return m;
2164
2165 m = match_ltag (&tag_eor, &dt->eor);
2166 if (m == MATCH_YES)
2167 dt->eor_where = gfc_current_locus;
2168 if (m != MATCH_NO)
2169 return m;
2170
2171 return MATCH_NO;
2172 }
2173
2174
2175 /* Free a data transfer structure and everything below it. */
2176
2177 void
2178 gfc_free_dt (gfc_dt * dt)
2179 {
2180
2181 if (dt == NULL)
2182 return;
2183
2184 gfc_free_expr (dt->io_unit);
2185 gfc_free_expr (dt->format_expr);
2186 gfc_free_expr (dt->rec);
2187 gfc_free_expr (dt->advance);
2188 gfc_free_expr (dt->iomsg);
2189 gfc_free_expr (dt->iostat);
2190 gfc_free_expr (dt->size);
2191
2192 gfc_free (dt);
2193 }
2194
2195
2196 /* Resolve everything in a gfc_dt structure. */
2197
2198 try
2199 gfc_resolve_dt (gfc_dt * dt)
2200 {
2201 gfc_expr *e;
2202
2203 RESOLVE_TAG (&tag_format, dt->format_expr);
2204 RESOLVE_TAG (&tag_rec, dt->rec);
2205 RESOLVE_TAG (&tag_spos, dt->rec);
2206 RESOLVE_TAG (&tag_advance, dt->advance);
2207 RESOLVE_TAG (&tag_iomsg, dt->iomsg);
2208 RESOLVE_TAG (&tag_iostat, dt->iostat);
2209 RESOLVE_TAG (&tag_size, dt->size);
2210
2211 e = dt->io_unit;
2212 if (gfc_resolve_expr (e) == SUCCESS
2213 && (e->ts.type != BT_INTEGER
2214 && (e->ts.type != BT_CHARACTER
2215 || e->expr_type != EXPR_VARIABLE)))
2216 {
2217 gfc_error
2218 ("UNIT specification at %L must be an INTEGER expression or a "
2219 "CHARACTER variable", &e->where);
2220 return FAILURE;
2221 }
2222
2223 if (e->ts.type == BT_CHARACTER)
2224 {
2225 if (gfc_has_vector_index (e))
2226 {
2227 gfc_error ("Internal unit with vector subscript at %L",
2228 &e->where);
2229 return FAILURE;
2230 }
2231 }
2232
2233 if (e->rank && e->ts.type != BT_CHARACTER)
2234 {
2235 gfc_error ("External IO UNIT cannot be an array at %L", &e->where);
2236 return FAILURE;
2237 }
2238
2239 if (dt->err)
2240 {
2241 if (gfc_reference_st_label (dt->err, ST_LABEL_TARGET) == FAILURE)
2242 return FAILURE;
2243 if (dt->err->defined == ST_LABEL_UNKNOWN)
2244 {
2245 gfc_error ("ERR tag label %d at %L not defined",
2246 dt->err->value, &dt->err_where);
2247 return FAILURE;
2248 }
2249 }
2250
2251 if (dt->end)
2252 {
2253 if (gfc_reference_st_label (dt->end, ST_LABEL_TARGET) == FAILURE)
2254 return FAILURE;
2255 if (dt->end->defined == ST_LABEL_UNKNOWN)
2256 {
2257 gfc_error ("END tag label %d at %L not defined",
2258 dt->end->value, &dt->end_where);
2259 return FAILURE;
2260 }
2261 }
2262
2263 if (dt->eor)
2264 {
2265 if (gfc_reference_st_label (dt->eor, ST_LABEL_TARGET) == FAILURE)
2266 return FAILURE;
2267 if (dt->eor->defined == ST_LABEL_UNKNOWN)
2268 {
2269 gfc_error ("EOR tag label %d at %L not defined",
2270 dt->eor->value, &dt->eor_where);
2271 return FAILURE;
2272 }
2273 }
2274
2275 /* Check the format label actually exists. */
2276 if (dt->format_label && dt->format_label != &format_asterisk
2277 && dt->format_label->defined == ST_LABEL_UNKNOWN)
2278 {
2279 gfc_error ("FORMAT label %d at %L not defined", dt->format_label->value,
2280 &dt->format_label->where);
2281 return FAILURE;
2282 }
2283 return SUCCESS;
2284 }
2285
2286
2287 /* Given an io_kind, return its name. */
2288
2289 static const char *
2290 io_kind_name (io_kind k)
2291 {
2292 const char *name;
2293
2294 switch (k)
2295 {
2296 case M_READ:
2297 name = "READ";
2298 break;
2299 case M_WRITE:
2300 name = "WRITE";
2301 break;
2302 case M_PRINT:
2303 name = "PRINT";
2304 break;
2305 case M_INQUIRE:
2306 name = "INQUIRE";
2307 break;
2308 default:
2309 gfc_internal_error ("io_kind_name(): bad I/O-kind");
2310 }
2311
2312 return name;
2313 }
2314
2315
2316 /* Match an IO iteration statement of the form:
2317
2318 ( [<IO element> ,] <IO element>, I = <expr>, <expr> [, <expr> ] )
2319
2320 which is equivalent to a single IO element. This function is
2321 mutually recursive with match_io_element(). */
2322
2323 static match match_io_element (io_kind k, gfc_code **);
2324
2325 static match
2326 match_io_iterator (io_kind k, gfc_code ** result)
2327 {
2328 gfc_code *head, *tail, *new;
2329 gfc_iterator *iter;
2330 locus old_loc;
2331 match m;
2332 int n;
2333
2334 iter = NULL;
2335 head = NULL;
2336 old_loc = gfc_current_locus;
2337
2338 if (gfc_match_char ('(') != MATCH_YES)
2339 return MATCH_NO;
2340
2341 m = match_io_element (k, &head);
2342 tail = head;
2343
2344 if (m != MATCH_YES || gfc_match_char (',') != MATCH_YES)
2345 {
2346 m = MATCH_NO;
2347 goto cleanup;
2348 }
2349
2350 /* Can't be anything but an IO iterator. Build a list. */
2351 iter = gfc_get_iterator ();
2352
2353 for (n = 1;; n++)
2354 {
2355 m = gfc_match_iterator (iter, 0);
2356 if (m == MATCH_ERROR)
2357 goto cleanup;
2358 if (m == MATCH_YES)
2359 {
2360 gfc_check_do_variable (iter->var->symtree);
2361 break;
2362 }
2363
2364 m = match_io_element (k, &new);
2365 if (m == MATCH_ERROR)
2366 goto cleanup;
2367 if (m == MATCH_NO)
2368 {
2369 if (n > 2)
2370 goto syntax;
2371 goto cleanup;
2372 }
2373
2374 tail = gfc_append_code (tail, new);
2375
2376 if (gfc_match_char (',') != MATCH_YES)
2377 {
2378 if (n > 2)
2379 goto syntax;
2380 m = MATCH_NO;
2381 goto cleanup;
2382 }
2383 }
2384
2385 if (gfc_match_char (')') != MATCH_YES)
2386 goto syntax;
2387
2388 new = gfc_get_code ();
2389 new->op = EXEC_DO;
2390 new->ext.iterator = iter;
2391
2392 new->block = gfc_get_code ();
2393 new->block->op = EXEC_DO;
2394 new->block->next = head;
2395
2396 *result = new;
2397 return MATCH_YES;
2398
2399 syntax:
2400 gfc_error ("Syntax error in I/O iterator at %C");
2401 m = MATCH_ERROR;
2402
2403 cleanup:
2404 gfc_free_iterator (iter, 1);
2405 gfc_free_statements (head);
2406 gfc_current_locus = old_loc;
2407 return m;
2408 }
2409
2410
2411 /* Match a single element of an IO list, which is either a single
2412 expression or an IO Iterator. */
2413
2414 static match
2415 match_io_element (io_kind k, gfc_code ** cpp)
2416 {
2417 gfc_expr *expr;
2418 gfc_code *cp;
2419 match m;
2420
2421 expr = NULL;
2422
2423 m = match_io_iterator (k, cpp);
2424 if (m == MATCH_YES)
2425 return MATCH_YES;
2426
2427 if (k == M_READ)
2428 {
2429 m = gfc_match_variable (&expr, 0);
2430 if (m == MATCH_NO)
2431 gfc_error ("Expected variable in READ statement at %C");
2432 }
2433 else
2434 {
2435 m = gfc_match_expr (&expr);
2436 if (m == MATCH_NO)
2437 gfc_error ("Expected expression in %s statement at %C",
2438 io_kind_name (k));
2439 }
2440
2441 if (m == MATCH_YES)
2442 switch (k)
2443 {
2444 case M_READ:
2445 if (expr->symtree->n.sym->attr.intent == INTENT_IN)
2446 {
2447 gfc_error
2448 ("Variable '%s' in input list at %C cannot be INTENT(IN)",
2449 expr->symtree->n.sym->name);
2450 m = MATCH_ERROR;
2451 }
2452
2453 if (gfc_pure (NULL)
2454 && gfc_impure_variable (expr->symtree->n.sym)
2455 && current_dt->io_unit->ts.type == BT_CHARACTER)
2456 {
2457 gfc_error ("Cannot read to variable '%s' in PURE procedure at %C",
2458 expr->symtree->n.sym->name);
2459 m = MATCH_ERROR;
2460 }
2461
2462 if (gfc_check_do_variable (expr->symtree))
2463 m = MATCH_ERROR;
2464
2465 break;
2466
2467 case M_WRITE:
2468 if (current_dt->io_unit->ts.type == BT_CHARACTER
2469 && gfc_pure (NULL)
2470 && current_dt->io_unit->expr_type == EXPR_VARIABLE
2471 && gfc_impure_variable (current_dt->io_unit->symtree->n.sym))
2472 {
2473 gfc_error
2474 ("Cannot write to internal file unit '%s' at %C inside a "
2475 "PURE procedure", current_dt->io_unit->symtree->n.sym->name);
2476 m = MATCH_ERROR;
2477 }
2478
2479 break;
2480
2481 default:
2482 break;
2483 }
2484
2485 if (m != MATCH_YES)
2486 {
2487 gfc_free_expr (expr);
2488 return MATCH_ERROR;
2489 }
2490
2491 cp = gfc_get_code ();
2492 cp->op = EXEC_TRANSFER;
2493 cp->expr = expr;
2494
2495 *cpp = cp;
2496 return MATCH_YES;
2497 }
2498
2499
2500 /* Match an I/O list, building gfc_code structures as we go. */
2501
2502 static match
2503 match_io_list (io_kind k, gfc_code ** head_p)
2504 {
2505 gfc_code *head, *tail, *new;
2506 match m;
2507
2508 *head_p = head = tail = NULL;
2509 if (gfc_match_eos () == MATCH_YES)
2510 return MATCH_YES;
2511
2512 for (;;)
2513 {
2514 m = match_io_element (k, &new);
2515 if (m == MATCH_ERROR)
2516 goto cleanup;
2517 if (m == MATCH_NO)
2518 goto syntax;
2519
2520 tail = gfc_append_code (tail, new);
2521 if (head == NULL)
2522 head = new;
2523
2524 if (gfc_match_eos () == MATCH_YES)
2525 break;
2526 if (gfc_match_char (',') != MATCH_YES)
2527 goto syntax;
2528 }
2529
2530 *head_p = head;
2531 return MATCH_YES;
2532
2533 syntax:
2534 gfc_error ("Syntax error in %s statement at %C", io_kind_name (k));
2535
2536 cleanup:
2537 gfc_free_statements (head);
2538 return MATCH_ERROR;
2539 }
2540
2541
2542 /* Attach the data transfer end node. */
2543
2544 static void
2545 terminate_io (gfc_code * io_code)
2546 {
2547 gfc_code *c;
2548
2549 if (io_code == NULL)
2550 io_code = new_st.block;
2551
2552 c = gfc_get_code ();
2553 c->op = EXEC_DT_END;
2554
2555 /* Point to structure that is already there */
2556 c->ext.dt = new_st.ext.dt;
2557 gfc_append_code (io_code, c);
2558 }
2559
2560
2561 /* Check the constraints for a data transfer statement. The majority of the
2562 constraints appearing in 9.4 of the standard appear here. Some are handled
2563 in resolve_tag and others in gfc_resolve_dt. */
2564
2565 static match
2566 check_io_constraints (io_kind k, gfc_dt *dt, gfc_code * io_code, locus * spec_end)
2567 {
2568 #define io_constraint(condition,msg,arg)\
2569 if (condition) \
2570 {\
2571 gfc_error(msg,arg);\
2572 m = MATCH_ERROR;\
2573 }
2574
2575 match m;
2576 gfc_expr * expr;
2577 gfc_symbol * sym = NULL;
2578
2579 m = MATCH_YES;
2580
2581 expr = dt->io_unit;
2582 if (expr && expr->expr_type == EXPR_VARIABLE
2583 && expr->ts.type == BT_CHARACTER)
2584 {
2585 sym = expr->symtree->n.sym;
2586
2587 io_constraint (k == M_WRITE && sym->attr.intent == INTENT_IN,
2588 "Internal file at %L must not be INTENT(IN)",
2589 &expr->where);
2590
2591 io_constraint (gfc_has_vector_index (dt->io_unit),
2592 "Internal file incompatible with vector subscript at %L",
2593 &expr->where);
2594
2595 io_constraint (dt->rec != NULL,
2596 "REC tag at %L is incompatible with internal file",
2597 &dt->rec->where);
2598
2599 io_constraint (dt->namelist != NULL,
2600 "Internal file at %L is incompatible with namelist",
2601 &expr->where);
2602
2603 io_constraint (dt->advance != NULL,
2604 "ADVANCE tag at %L is incompatible with internal file",
2605 &dt->advance->where);
2606 }
2607
2608 if (expr && expr->ts.type != BT_CHARACTER)
2609 {
2610
2611 io_constraint (gfc_pure (NULL)
2612 && (k == M_READ || k == M_WRITE),
2613 "IO UNIT in %s statement at %C must be "
2614 "an internal file in a PURE procedure",
2615 io_kind_name (k));
2616 }
2617
2618
2619 if (k != M_READ)
2620 {
2621 io_constraint (dt->end,
2622 "END tag not allowed with output at %L",
2623 &dt->end_where);
2624
2625 io_constraint (dt->eor,
2626 "EOR tag not allowed with output at %L",
2627 &dt->eor_where);
2628
2629 io_constraint (k != M_READ && dt->size,
2630 "SIZE=specifier not allowed with output at %L",
2631 &dt->size->where);
2632 }
2633 else
2634 {
2635 io_constraint (dt->size && dt->advance == NULL,
2636 "SIZE tag at %L requires an ADVANCE tag",
2637 &dt->size->where);
2638
2639 io_constraint (dt->eor && dt->advance == NULL,
2640 "EOR tag at %L requires an ADVANCE tag",
2641 &dt->eor_where);
2642 }
2643
2644
2645
2646 if (dt->namelist)
2647 {
2648 io_constraint (io_code && dt->namelist,
2649 "NAMELIST cannot be followed by IO-list at %L",
2650 &io_code->loc);
2651
2652 io_constraint (dt->format_expr,
2653 "IO spec-list cannot contain both NAMELIST group name "
2654 "and format specification at %L.",
2655 &dt->format_expr->where);
2656
2657 io_constraint (dt->format_label,
2658 "IO spec-list cannot contain both NAMELIST group name "
2659 "and format label at %L", spec_end);
2660
2661 io_constraint (dt->rec,
2662 "NAMELIST IO is not allowed with a REC=specifier "
2663 "at %L.", &dt->rec->where);
2664
2665 io_constraint (dt->advance,
2666 "NAMELIST IO is not allowed with a ADVANCE=specifier "
2667 "at %L.", &dt->advance->where);
2668 }
2669
2670 if (dt->rec)
2671 {
2672 io_constraint (dt->end,
2673 "An END tag is not allowed with a "
2674 "REC=specifier at %L.", &dt->end_where);
2675
2676
2677 io_constraint (dt->format_label == &format_asterisk,
2678 "FMT=* is not allowed with a REC=specifier "
2679 "at %L.", spec_end);
2680 }
2681
2682 if (dt->advance)
2683 {
2684 int not_yes, not_no;
2685 expr = dt->advance;
2686
2687 io_constraint (dt->format_label == &format_asterisk,
2688 "List directed format(*) is not allowed with a "
2689 "ADVANCE=specifier at %L.", &expr->where);
2690
2691 io_constraint (dt->format_expr == NULL
2692 && dt->format_label == NULL
2693 && dt->namelist == NULL,
2694 "the ADVANCE=specifier at %L must appear with an "
2695 "explicit format expression", &expr->where);
2696
2697 if (expr->expr_type == EXPR_CONSTANT && expr->ts.type == BT_CHARACTER)
2698 {
2699 const char * advance = expr->value.character.string;
2700 not_no = strncasecmp (advance, "no", 2) != 0;
2701 not_yes = strncasecmp (advance, "yes", 2) != 0;
2702 }
2703 else
2704 {
2705 not_no = 0;
2706 not_yes = 0;
2707 }
2708
2709 io_constraint (not_no && not_yes,
2710 "ADVANCE=specifier at %L must have value = "
2711 "YES or NO.", &expr->where);
2712
2713 io_constraint (dt->size && not_no && k == M_READ,
2714 "SIZE tag at %L requires an ADVANCE = 'NO'",
2715 &dt->size->where);
2716
2717 io_constraint (dt->eor && not_no && k == M_READ,
2718 "EOR tag at %L requires an ADVANCE = 'NO'",
2719 &dt->eor_where);
2720 }
2721
2722 expr = dt->format_expr;
2723 if (expr != NULL && expr->expr_type == EXPR_CONSTANT)
2724 check_format_string (expr);
2725
2726 return m;
2727 }
2728 #undef io_constraint
2729
2730 /* Match a READ, WRITE or PRINT statement. */
2731
2732 static match
2733 match_io (io_kind k)
2734 {
2735 char name[GFC_MAX_SYMBOL_LEN + 1];
2736 gfc_code *io_code;
2737 gfc_symbol *sym;
2738 int comma_flag, c;
2739 locus where;
2740 locus spec_end;
2741 gfc_dt *dt;
2742 match m;
2743
2744 where = gfc_current_locus;
2745 comma_flag = 0;
2746 current_dt = dt = gfc_getmem (sizeof (gfc_dt));
2747 if (gfc_match_char ('(') == MATCH_NO)
2748 {
2749 where = gfc_current_locus;
2750 if (k == M_WRITE)
2751 goto syntax;
2752 else if (k == M_PRINT)
2753 {
2754 /* Treat the non-standard case of PRINT namelist. */
2755 if ((gfc_current_form == FORM_FIXED || gfc_peek_char () == ' ')
2756 && gfc_match_name (name) == MATCH_YES)
2757 {
2758 gfc_find_symbol (name, NULL, 1, &sym);
2759 if (sym && sym->attr.flavor == FL_NAMELIST)
2760 {
2761 if (gfc_notify_std (GFC_STD_GNU, "PRINT namelist at "
2762 "%C is an extension") == FAILURE)
2763 {
2764 m = MATCH_ERROR;
2765 goto cleanup;
2766 }
2767
2768 dt->io_unit = default_unit (k);
2769 dt->namelist = sym;
2770 goto get_io_list;
2771 }
2772 else
2773 gfc_current_locus = where;
2774 }
2775 }
2776
2777 if (gfc_current_form == FORM_FREE)
2778 {
2779 c = gfc_peek_char();
2780 if (c != ' ' && c != '*' && c != '\'' && c != '"')
2781 {
2782 m = MATCH_NO;
2783 goto cleanup;
2784 }
2785 }
2786
2787 m = match_dt_format (dt);
2788 if (m == MATCH_ERROR)
2789 goto cleanup;
2790 if (m == MATCH_NO)
2791 goto syntax;
2792
2793 comma_flag = 1;
2794 dt->io_unit = default_unit (k);
2795 goto get_io_list;
2796 }
2797 else
2798 {
2799 /* Error for constructs like print (1,*). */
2800 if (k == M_PRINT)
2801 goto syntax;
2802 }
2803
2804 /* Match a control list */
2805 if (match_dt_element (k, dt) == MATCH_YES)
2806 goto next;
2807 if (match_dt_unit (k, dt) != MATCH_YES)
2808 goto loop;
2809
2810 if (gfc_match_char (')') == MATCH_YES)
2811 goto get_io_list;
2812 if (gfc_match_char (',') != MATCH_YES)
2813 goto syntax;
2814
2815 m = match_dt_element (k, dt);
2816 if (m == MATCH_YES)
2817 goto next;
2818 if (m == MATCH_ERROR)
2819 goto cleanup;
2820
2821 m = match_dt_format (dt);
2822 if (m == MATCH_YES)
2823 goto next;
2824 if (m == MATCH_ERROR)
2825 goto cleanup;
2826
2827 where = gfc_current_locus;
2828
2829 m = gfc_match_name (name);
2830 if (m == MATCH_YES)
2831 {
2832 gfc_find_symbol (name, NULL, 1, &sym);
2833 if (sym && sym->attr.flavor == FL_NAMELIST)
2834 {
2835 dt->namelist = sym;
2836 if (k == M_READ && check_namelist (sym))
2837 {
2838 m = MATCH_ERROR;
2839 goto cleanup;
2840 }
2841 goto next;
2842 }
2843 }
2844
2845 gfc_current_locus = where;
2846
2847 goto loop; /* No matches, try regular elements */
2848
2849 next:
2850 if (gfc_match_char (')') == MATCH_YES)
2851 goto get_io_list;
2852 if (gfc_match_char (',') != MATCH_YES)
2853 goto syntax;
2854
2855 loop:
2856 for (;;)
2857 {
2858 m = match_dt_element (k, dt);
2859 if (m == MATCH_NO)
2860 goto syntax;
2861 if (m == MATCH_ERROR)
2862 goto cleanup;
2863
2864 if (gfc_match_char (')') == MATCH_YES)
2865 break;
2866 if (gfc_match_char (',') != MATCH_YES)
2867 goto syntax;
2868 }
2869
2870 get_io_list:
2871
2872 /* Used in check_io_constraints, where no locus is available. */
2873 spec_end = gfc_current_locus;
2874
2875 /* Optional leading comma (non-standard). */
2876 if (!comma_flag
2877 && gfc_match_char (',') == MATCH_YES
2878 && k == M_WRITE
2879 && gfc_notify_std (GFC_STD_GNU, "Extension: Comma before output "
2880 "item list at %C is an extension") == FAILURE)
2881 return MATCH_ERROR;
2882
2883 io_code = NULL;
2884 if (gfc_match_eos () != MATCH_YES)
2885 {
2886 if (comma_flag && gfc_match_char (',') != MATCH_YES)
2887 {
2888 gfc_error ("Expected comma in I/O list at %C");
2889 m = MATCH_ERROR;
2890 goto cleanup;
2891 }
2892
2893 m = match_io_list (k, &io_code);
2894 if (m == MATCH_ERROR)
2895 goto cleanup;
2896 if (m == MATCH_NO)
2897 goto syntax;
2898 }
2899
2900 /* A full IO statement has been matched. Check the constraints. spec_end is
2901 supplied for cases where no locus is supplied. */
2902 m = check_io_constraints (k, dt, io_code, &spec_end);
2903
2904 if (m == MATCH_ERROR)
2905 goto cleanup;
2906
2907 new_st.op = (k == M_READ) ? EXEC_READ : EXEC_WRITE;
2908 new_st.ext.dt = dt;
2909 new_st.block = gfc_get_code ();
2910 new_st.block->op = new_st.op;
2911 new_st.block->next = io_code;
2912
2913 terminate_io (io_code);
2914
2915 return MATCH_YES;
2916
2917 syntax:
2918 gfc_error ("Syntax error in %s statement at %C", io_kind_name (k));
2919 m = MATCH_ERROR;
2920
2921 cleanup:
2922 gfc_free_dt (dt);
2923 return m;
2924 }
2925
2926
2927 match
2928 gfc_match_read (void)
2929 {
2930 return match_io (M_READ);
2931 }
2932
2933 match
2934 gfc_match_write (void)
2935 {
2936 return match_io (M_WRITE);
2937 }
2938
2939 match
2940 gfc_match_print (void)
2941 {
2942 match m;
2943
2944 m = match_io (M_PRINT);
2945 if (m != MATCH_YES)
2946 return m;
2947
2948 if (gfc_pure (NULL))
2949 {
2950 gfc_error ("PRINT statement at %C not allowed within PURE procedure");
2951 return MATCH_ERROR;
2952 }
2953
2954 return MATCH_YES;
2955 }
2956
2957
2958 /* Free a gfc_inquire structure. */
2959
2960 void
2961 gfc_free_inquire (gfc_inquire * inquire)
2962 {
2963
2964 if (inquire == NULL)
2965 return;
2966
2967 gfc_free_expr (inquire->unit);
2968 gfc_free_expr (inquire->file);
2969 gfc_free_expr (inquire->iomsg);
2970 gfc_free_expr (inquire->iostat);
2971 gfc_free_expr (inquire->exist);
2972 gfc_free_expr (inquire->opened);
2973 gfc_free_expr (inquire->number);
2974 gfc_free_expr (inquire->named);
2975 gfc_free_expr (inquire->name);
2976 gfc_free_expr (inquire->access);
2977 gfc_free_expr (inquire->sequential);
2978 gfc_free_expr (inquire->direct);
2979 gfc_free_expr (inquire->form);
2980 gfc_free_expr (inquire->formatted);
2981 gfc_free_expr (inquire->unformatted);
2982 gfc_free_expr (inquire->recl);
2983 gfc_free_expr (inquire->nextrec);
2984 gfc_free_expr (inquire->blank);
2985 gfc_free_expr (inquire->position);
2986 gfc_free_expr (inquire->action);
2987 gfc_free_expr (inquire->read);
2988 gfc_free_expr (inquire->write);
2989 gfc_free_expr (inquire->readwrite);
2990 gfc_free_expr (inquire->delim);
2991 gfc_free_expr (inquire->pad);
2992 gfc_free_expr (inquire->iolength);
2993 gfc_free_expr (inquire->convert);
2994 gfc_free_expr (inquire->strm_pos);
2995
2996 gfc_free (inquire);
2997 }
2998
2999
3000 /* Match an element of an INQUIRE statement. */
3001
3002 #define RETM if (m != MATCH_NO) return m;
3003
3004 static match
3005 match_inquire_element (gfc_inquire * inquire)
3006 {
3007 match m;
3008
3009 m = match_etag (&tag_unit, &inquire->unit);
3010 RETM m = match_etag (&tag_file, &inquire->file);
3011 RETM m = match_ltag (&tag_err, &inquire->err);
3012 RETM m = match_out_tag (&tag_iomsg, &inquire->iomsg);
3013 RETM m = match_out_tag (&tag_iostat, &inquire->iostat);
3014 RETM m = match_vtag (&tag_exist, &inquire->exist);
3015 RETM m = match_vtag (&tag_opened, &inquire->opened);
3016 RETM m = match_vtag (&tag_named, &inquire->named);
3017 RETM m = match_vtag (&tag_name, &inquire->name);
3018 RETM m = match_out_tag (&tag_number, &inquire->number);
3019 RETM m = match_vtag (&tag_s_access, &inquire->access);
3020 RETM m = match_vtag (&tag_sequential, &inquire->sequential);
3021 RETM m = match_vtag (&tag_direct, &inquire->direct);
3022 RETM m = match_vtag (&tag_s_form, &inquire->form);
3023 RETM m = match_vtag (&tag_formatted, &inquire->formatted);
3024 RETM m = match_vtag (&tag_unformatted, &inquire->unformatted);
3025 RETM m = match_out_tag (&tag_s_recl, &inquire->recl);
3026 RETM m = match_out_tag (&tag_nextrec, &inquire->nextrec);
3027 RETM m = match_vtag (&tag_s_blank, &inquire->blank);
3028 RETM m = match_vtag (&tag_s_position, &inquire->position);
3029 RETM m = match_vtag (&tag_s_action, &inquire->action);
3030 RETM m = match_vtag (&tag_read, &inquire->read);
3031 RETM m = match_vtag (&tag_write, &inquire->write);
3032 RETM m = match_vtag (&tag_readwrite, &inquire->readwrite);
3033 RETM m = match_vtag (&tag_s_delim, &inquire->delim);
3034 RETM m = match_vtag (&tag_s_pad, &inquire->pad);
3035 RETM m = match_vtag (&tag_iolength, &inquire->iolength);
3036 RETM m = match_vtag (&tag_convert, &inquire->convert);
3037 RETM m = match_out_tag (&tag_strm_out, &inquire->strm_pos);
3038 RETM return MATCH_NO;
3039 }
3040
3041 #undef RETM
3042
3043
3044 match
3045 gfc_match_inquire (void)
3046 {
3047 gfc_inquire *inquire;
3048 gfc_code *code;
3049 match m;
3050 locus loc;
3051
3052 m = gfc_match_char ('(');
3053 if (m == MATCH_NO)
3054 return m;
3055
3056 inquire = gfc_getmem (sizeof (gfc_inquire));
3057
3058 loc = gfc_current_locus;
3059
3060 m = match_inquire_element (inquire);
3061 if (m == MATCH_ERROR)
3062 goto cleanup;
3063 if (m == MATCH_NO)
3064 {
3065 m = gfc_match_expr (&inquire->unit);
3066 if (m == MATCH_ERROR)
3067 goto cleanup;
3068 if (m == MATCH_NO)
3069 goto syntax;
3070 }
3071
3072 /* See if we have the IOLENGTH form of the inquire statement. */
3073 if (inquire->iolength != NULL)
3074 {
3075 if (gfc_match_char (')') != MATCH_YES)
3076 goto syntax;
3077
3078 m = match_io_list (M_INQUIRE, &code);
3079 if (m == MATCH_ERROR)
3080 goto cleanup;
3081 if (m == MATCH_NO)
3082 goto syntax;
3083
3084 new_st.op = EXEC_IOLENGTH;
3085 new_st.expr = inquire->iolength;
3086 new_st.ext.inquire = inquire;
3087
3088 if (gfc_pure (NULL))
3089 {
3090 gfc_free_statements (code);
3091 gfc_error ("INQUIRE statement not allowed in PURE procedure at %C");
3092 return MATCH_ERROR;
3093 }
3094
3095 new_st.block = gfc_get_code ();
3096 new_st.block->op = EXEC_IOLENGTH;
3097 terminate_io (code);
3098 new_st.block->next = code;
3099 return MATCH_YES;
3100 }
3101
3102 /* At this point, we have the non-IOLENGTH inquire statement. */
3103 for (;;)
3104 {
3105 if (gfc_match_char (')') == MATCH_YES)
3106 break;
3107 if (gfc_match_char (',') != MATCH_YES)
3108 goto syntax;
3109
3110 m = match_inquire_element (inquire);
3111 if (m == MATCH_ERROR)
3112 goto cleanup;
3113 if (m == MATCH_NO)
3114 goto syntax;
3115
3116 if (inquire->iolength != NULL)
3117 {
3118 gfc_error ("IOLENGTH tag invalid in INQUIRE statement at %C");
3119 goto cleanup;
3120 }
3121 }
3122
3123 if (gfc_match_eos () != MATCH_YES)
3124 goto syntax;
3125
3126 if (inquire->unit != NULL && inquire->file != NULL)
3127 {
3128 gfc_error ("INQUIRE statement at %L cannot contain both FILE and"
3129 " UNIT specifiers", &loc);
3130 goto cleanup;
3131 }
3132
3133 if (inquire->unit == NULL && inquire->file == NULL)
3134 {
3135 gfc_error ("INQUIRE statement at %L requires either FILE or"
3136 " UNIT specifier", &loc);
3137 goto cleanup;
3138 }
3139
3140 if (gfc_pure (NULL))
3141 {
3142 gfc_error ("INQUIRE statement not allowed in PURE procedure at %C");
3143 goto cleanup;
3144 }
3145
3146 new_st.op = EXEC_INQUIRE;
3147 new_st.ext.inquire = inquire;
3148 return MATCH_YES;
3149
3150 syntax:
3151 gfc_syntax_error (ST_INQUIRE);
3152
3153 cleanup:
3154 gfc_free_inquire (inquire);
3155 return MATCH_ERROR;
3156 }
3157
3158
3159 /* Resolve everything in a gfc_inquire structure. */
3160
3161 try
3162 gfc_resolve_inquire (gfc_inquire * inquire)
3163 {
3164
3165 RESOLVE_TAG (&tag_unit, inquire->unit);
3166 RESOLVE_TAG (&tag_file, inquire->file);
3167 RESOLVE_TAG (&tag_iomsg, inquire->iomsg);
3168 RESOLVE_TAG (&tag_iostat, inquire->iostat);
3169 RESOLVE_TAG (&tag_exist, inquire->exist);
3170 RESOLVE_TAG (&tag_opened, inquire->opened);
3171 RESOLVE_TAG (&tag_number, inquire->number);
3172 RESOLVE_TAG (&tag_named, inquire->named);
3173 RESOLVE_TAG (&tag_name, inquire->name);
3174 RESOLVE_TAG (&tag_s_access, inquire->access);
3175 RESOLVE_TAG (&tag_sequential, inquire->sequential);
3176 RESOLVE_TAG (&tag_direct, inquire->direct);
3177 RESOLVE_TAG (&tag_s_form, inquire->form);
3178 RESOLVE_TAG (&tag_formatted, inquire->formatted);
3179 RESOLVE_TAG (&tag_unformatted, inquire->unformatted);
3180 RESOLVE_TAG (&tag_s_recl, inquire->recl);
3181 RESOLVE_TAG (&tag_nextrec, inquire->nextrec);
3182 RESOLVE_TAG (&tag_s_blank, inquire->blank);
3183 RESOLVE_TAG (&tag_s_position, inquire->position);
3184 RESOLVE_TAG (&tag_s_action, inquire->action);
3185 RESOLVE_TAG (&tag_read, inquire->read);
3186 RESOLVE_TAG (&tag_write, inquire->write);
3187 RESOLVE_TAG (&tag_readwrite, inquire->readwrite);
3188 RESOLVE_TAG (&tag_s_delim, inquire->delim);
3189 RESOLVE_TAG (&tag_s_pad, inquire->pad);
3190 RESOLVE_TAG (&tag_iolength, inquire->iolength);
3191 RESOLVE_TAG (&tag_convert, inquire->convert);
3192 RESOLVE_TAG (&tag_strm_out, inquire->strm_pos);
3193
3194 if (gfc_reference_st_label (inquire->err, ST_LABEL_TARGET) == FAILURE)
3195 return FAILURE;
3196
3197 return SUCCESS;
3198 }