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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, 2007, 2008, 2009
3 Free Software Foundation, Inc.
4 Contributed by Andy Vaught
5
6 This file is part of GCC.
7
8 GCC is free software; you can redistribute it and/or modify it under
9 the terms of the GNU General Public License as published by the Free
10 Software Foundation; either version 3, or (at your option) any later
11 version.
12
13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
16 for more details.
17
18 You should have received a copy of the GNU General Public License
19 along with GCC; see the file COPYING3. If not see
20 <http://www.gnu.org/licenses/>. */
21
22 #include "config.h"
23 #include "system.h"
24 #include "flags.h"
25 #include "gfortran.h"
26 #include "match.h"
27 #include "parse.h"
28
29 gfc_st_label
30 format_asterisk = {0, NULL, NULL, -1, ST_LABEL_FORMAT, ST_LABEL_FORMAT, NULL,
31 0, {NULL, NULL}};
32
33 typedef struct
34 {
35 const char *name, *spec, *value;
36 bt type;
37 }
38 io_tag;
39
40 static const io_tag
41 tag_file = {"FILE", " file =", " %e", BT_CHARACTER },
42 tag_status = {"STATUS", " status =", " %e", BT_CHARACTER},
43 tag_e_access = {"ACCESS", " access =", " %e", BT_CHARACTER},
44 tag_e_form = {"FORM", " form =", " %e", BT_CHARACTER},
45 tag_e_recl = {"RECL", " recl =", " %e", BT_INTEGER},
46 tag_e_blank = {"BLANK", " blank =", " %e", BT_CHARACTER},
47 tag_e_position = {"POSITION", " position =", " %e", BT_CHARACTER},
48 tag_e_action = {"ACTION", " action =", " %e", BT_CHARACTER},
49 tag_e_delim = {"DELIM", " delim =", " %e", BT_CHARACTER},
50 tag_e_pad = {"PAD", " pad =", " %e", BT_CHARACTER},
51 tag_e_decimal = {"DECIMAL", " decimal =", " %e", BT_CHARACTER},
52 tag_e_encoding = {"ENCODING", " encoding =", " %e", BT_CHARACTER},
53 tag_e_async = {"ASYNCHRONOUS", " asynchronous =", " %e", BT_CHARACTER},
54 tag_e_round = {"ROUND", " round =", " %e", BT_CHARACTER},
55 tag_e_sign = {"SIGN", " sign =", " %e", BT_CHARACTER},
56 tag_unit = {"UNIT", " unit =", " %e", BT_INTEGER},
57 tag_advance = {"ADVANCE", " advance =", " %e", BT_CHARACTER},
58 tag_rec = {"REC", " rec =", " %e", BT_INTEGER},
59 tag_spos = {"POSITION", " pos =", " %e", BT_INTEGER},
60 tag_format = {"FORMAT", NULL, NULL, BT_CHARACTER},
61 tag_iomsg = {"IOMSG", " iomsg =", " %e", BT_CHARACTER},
62 tag_iostat = {"IOSTAT", " iostat =", " %v", BT_INTEGER},
63 tag_size = {"SIZE", " size =", " %v", BT_INTEGER},
64 tag_exist = {"EXIST", " exist =", " %v", BT_LOGICAL},
65 tag_opened = {"OPENED", " opened =", " %v", BT_LOGICAL},
66 tag_named = {"NAMED", " named =", " %v", BT_LOGICAL},
67 tag_name = {"NAME", " name =", " %v", BT_CHARACTER},
68 tag_number = {"NUMBER", " number =", " %v", BT_INTEGER},
69 tag_s_access = {"ACCESS", " access =", " %v", BT_CHARACTER},
70 tag_sequential = {"SEQUENTIAL", " sequential =", " %v", BT_CHARACTER},
71 tag_direct = {"DIRECT", " direct =", " %v", BT_CHARACTER},
72 tag_s_form = {"FORM", " form =", " %v", BT_CHARACTER},
73 tag_formatted = {"FORMATTED", " formatted =", " %v", BT_CHARACTER},
74 tag_unformatted = {"UNFORMATTED", " unformatted =", " %v", BT_CHARACTER},
75 tag_s_recl = {"RECL", " recl =", " %v", BT_INTEGER},
76 tag_nextrec = {"NEXTREC", " nextrec =", " %v", BT_INTEGER},
77 tag_s_blank = {"BLANK", " blank =", " %v", BT_CHARACTER},
78 tag_s_position = {"POSITION", " position =", " %v", BT_CHARACTER},
79 tag_s_action = {"ACTION", " action =", " %v", BT_CHARACTER},
80 tag_read = {"READ", " read =", " %v", BT_CHARACTER},
81 tag_write = {"WRITE", " write =", " %v", BT_CHARACTER},
82 tag_readwrite = {"READWRITE", " readwrite =", " %v", BT_CHARACTER},
83 tag_s_delim = {"DELIM", " delim =", " %v", BT_CHARACTER},
84 tag_s_pad = {"PAD", " pad =", " %v", BT_CHARACTER},
85 tag_s_decimal = {"DECIMAL", " decimal =", " %v", BT_CHARACTER},
86 tag_s_encoding = {"ENCODING", " encoding =", " %v", BT_CHARACTER},
87 tag_s_async = {"ASYNCHRONOUS", " asynchronous =", " %v", BT_CHARACTER},
88 tag_s_round = {"ROUND", " round =", " %v", BT_CHARACTER},
89 tag_s_sign = {"SIGN", " sign =", " %v", BT_CHARACTER},
90 tag_iolength = {"IOLENGTH", " iolength =", " %v", BT_INTEGER},
91 tag_convert = {"CONVERT", " convert =", " %e", BT_CHARACTER},
92 tag_strm_out = {"POS", " pos =", " %v", BT_INTEGER},
93 tag_err = {"ERR", " err =", " %l", BT_UNKNOWN},
94 tag_end = {"END", " end =", " %l", BT_UNKNOWN},
95 tag_eor = {"EOR", " eor =", " %l", BT_UNKNOWN},
96 tag_id = {"ID", " id =", " %v", BT_INTEGER},
97 tag_pending = {"PENDING", " pending =", " %v", BT_LOGICAL},
98 tag_newunit = {"NEWUNIT", " newunit =", " %v", BT_INTEGER};
99
100 static gfc_dt *current_dt;
101
102 #define RESOLVE_TAG(x, y) if (resolve_tag(x, y) == FAILURE) return FAILURE;
103
104
105 /**************** Fortran 95 FORMAT parser *****************/
106
107 /* FORMAT tokens returned by format_lex(). */
108 typedef enum
109 {
110 FMT_NONE, FMT_UNKNOWN, FMT_SIGNED_INT, FMT_ZERO, FMT_POSINT, FMT_PERIOD,
111 FMT_COMMA, FMT_COLON, FMT_SLASH, FMT_DOLLAR, FMT_LPAREN,
112 FMT_RPAREN, FMT_X, FMT_SIGN, FMT_BLANK, FMT_CHAR, FMT_P, FMT_IBOZ, FMT_F,
113 FMT_E, FMT_EXT, FMT_G, FMT_L, FMT_A, FMT_D, FMT_H, FMT_END, FMT_ERROR, FMT_DC,
114 FMT_DP, FMT_T, FMT_TR, FMT_TL, FMT_STAR
115 }
116 format_token;
117
118 /* Local variables for checking format strings. The saved_token is
119 used to back up by a single format token during the parsing
120 process. */
121 static gfc_char_t *format_string;
122 static int format_string_pos;
123 static int format_length, use_last_char;
124 static char error_element;
125 static locus format_locus;
126
127 static format_token saved_token;
128
129 static enum
130 { MODE_STRING, MODE_FORMAT, MODE_COPY }
131 mode;
132
133
134 /* Return the next character in the format string. */
135
136 static char
137 next_char (int in_string)
138 {
139 static gfc_char_t c;
140
141 if (use_last_char)
142 {
143 use_last_char = 0;
144 return c;
145 }
146
147 format_length++;
148
149 if (mode == MODE_STRING)
150 c = *format_string++;
151 else
152 {
153 c = gfc_next_char_literal (in_string);
154 if (c == '\n')
155 c = '\0';
156 }
157
158 if (gfc_option.flag_backslash && c == '\\')
159 {
160 locus old_locus = gfc_current_locus;
161
162 if (gfc_match_special_char (&c) == MATCH_NO)
163 gfc_current_locus = old_locus;
164
165 if (!(gfc_option.allow_std & GFC_STD_GNU) && !inhibit_warnings)
166 gfc_warning ("Extension: backslash character at %C");
167 }
168
169 if (mode == MODE_COPY)
170 *format_string++ = c;
171
172 if (mode != MODE_STRING)
173 format_locus = gfc_current_locus;
174
175 format_string_pos++;
176
177 c = gfc_wide_toupper (c);
178 return c;
179 }
180
181
182 /* Back up one character position. Only works once. */
183
184 static void
185 unget_char (void)
186 {
187 use_last_char = 1;
188 }
189
190 /* Eat up the spaces and return a character. */
191
192 static char
193 next_char_not_space (bool *error)
194 {
195 char c;
196 do
197 {
198 error_element = c = next_char (0);
199 if (c == '\t')
200 {
201 if (gfc_option.allow_std & GFC_STD_GNU)
202 gfc_warning ("Extension: Tab character in format at %C");
203 else
204 {
205 gfc_error ("Extension: Tab character in format at %C");
206 *error = true;
207 return c;
208 }
209 }
210 }
211 while (gfc_is_whitespace (c));
212 return c;
213 }
214
215 static int value = 0;
216
217 /* Simple lexical analyzer for getting the next token in a FORMAT
218 statement. */
219
220 static format_token
221 format_lex (void)
222 {
223 format_token token;
224 char c, delim;
225 int zflag;
226 int negative_flag;
227 bool error = false;
228
229 if (saved_token != FMT_NONE)
230 {
231 token = saved_token;
232 saved_token = FMT_NONE;
233 return token;
234 }
235
236 c = next_char_not_space (&error);
237
238 negative_flag = 0;
239 switch (c)
240 {
241 case '-':
242 negative_flag = 1;
243 case '+':
244 c = next_char_not_space (&error);
245 if (!ISDIGIT (c))
246 {
247 token = FMT_UNKNOWN;
248 break;
249 }
250
251 value = c - '0';
252
253 do
254 {
255 c = next_char_not_space (&error);
256 if (ISDIGIT (c))
257 value = 10 * value + c - '0';
258 }
259 while (ISDIGIT (c));
260
261 unget_char ();
262
263 if (negative_flag)
264 value = -value;
265
266 token = FMT_SIGNED_INT;
267 break;
268
269 case '0':
270 case '1':
271 case '2':
272 case '3':
273 case '4':
274 case '5':
275 case '6':
276 case '7':
277 case '8':
278 case '9':
279 zflag = (c == '0');
280
281 value = c - '0';
282
283 do
284 {
285 c = next_char_not_space (&error);
286 if (ISDIGIT (c))
287 {
288 value = 10 * value + c - '0';
289 if (c != '0')
290 zflag = 0;
291 }
292 }
293 while (ISDIGIT (c));
294
295 unget_char ();
296 token = zflag ? FMT_ZERO : FMT_POSINT;
297 break;
298
299 case '.':
300 token = FMT_PERIOD;
301 break;
302
303 case ',':
304 token = FMT_COMMA;
305 break;
306
307 case ':':
308 token = FMT_COLON;
309 break;
310
311 case '/':
312 token = FMT_SLASH;
313 break;
314
315 case '$':
316 token = FMT_DOLLAR;
317 break;
318
319 case 'T':
320 c = next_char_not_space (&error);
321 switch (c)
322 {
323 case 'L':
324 token = FMT_TL;
325 break;
326 case 'R':
327 token = FMT_TR;
328 break;
329 default:
330 token = FMT_T;
331 unget_char ();
332 }
333 break;
334
335 case '(':
336 token = FMT_LPAREN;
337 break;
338
339 case ')':
340 token = FMT_RPAREN;
341 break;
342
343 case 'X':
344 token = FMT_X;
345 break;
346
347 case 'S':
348 c = next_char_not_space (&error);
349 if (c != 'P' && c != 'S')
350 unget_char ();
351
352 token = FMT_SIGN;
353 break;
354
355 case 'B':
356 c = next_char_not_space (&error);
357 if (c == 'N' || c == 'Z')
358 token = FMT_BLANK;
359 else
360 {
361 unget_char ();
362 token = FMT_IBOZ;
363 }
364
365 break;
366
367 case '\'':
368 case '"':
369 delim = c;
370
371 value = 0;
372
373 for (;;)
374 {
375 c = next_char (1);
376 if (c == '\0')
377 {
378 token = FMT_END;
379 break;
380 }
381
382 if (c == delim)
383 {
384 c = next_char (1);
385
386 if (c == '\0')
387 {
388 token = FMT_END;
389 break;
390 }
391
392 if (c != delim)
393 {
394 unget_char ();
395 token = FMT_CHAR;
396 break;
397 }
398 }
399 value++;
400 }
401 break;
402
403 case 'P':
404 token = FMT_P;
405 break;
406
407 case 'I':
408 case 'O':
409 case 'Z':
410 token = FMT_IBOZ;
411 break;
412
413 case 'F':
414 token = FMT_F;
415 break;
416
417 case 'E':
418 c = next_char_not_space (&error);
419 if (c == 'N' || c == 'S')
420 token = FMT_EXT;
421 else
422 {
423 token = FMT_E;
424 unget_char ();
425 }
426
427 break;
428
429 case 'G':
430 token = FMT_G;
431 break;
432
433 case 'H':
434 token = FMT_H;
435 break;
436
437 case 'L':
438 token = FMT_L;
439 break;
440
441 case 'A':
442 token = FMT_A;
443 break;
444
445 case 'D':
446 c = next_char_not_space (&error);
447 if (c == 'P')
448 {
449 if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: DP format "
450 "specifier not allowed at %C") == FAILURE)
451 return FMT_ERROR;
452 token = FMT_DP;
453 }
454 else if (c == 'C')
455 {
456 if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: DC format "
457 "specifier not allowed at %C") == FAILURE)
458 return FMT_ERROR;
459 token = FMT_DC;
460 }
461 else
462 {
463 token = FMT_D;
464 unget_char ();
465 }
466 break;
467
468 case '\0':
469 token = FMT_END;
470 break;
471
472 case '*':
473 token = FMT_STAR;
474 break;
475
476 default:
477 token = FMT_UNKNOWN;
478 break;
479 }
480
481 if (error)
482 return FMT_ERROR;
483
484 return token;
485 }
486
487
488 /* Check a format statement. The format string, either from a FORMAT
489 statement or a constant in an I/O statement has already been parsed
490 by itself, and we are checking it for validity. The dual origin
491 means that the warning message is a little less than great. */
492
493 static gfc_try
494 check_format (bool is_input)
495 {
496 const char *posint_required = _("Positive width required");
497 const char *nonneg_required = _("Nonnegative width required");
498 const char *unexpected_element = _("Unexpected element '%c' in format string"
499 " at %L");
500 const char *unexpected_end = _("Unexpected end of format string");
501 const char *zero_width = _("Zero width in format descriptor");
502
503 const char *error;
504 format_token t, u;
505 int level;
506 int repeat;
507 gfc_try rv;
508
509 use_last_char = 0;
510 saved_token = FMT_NONE;
511 level = 0;
512 repeat = 0;
513 rv = SUCCESS;
514 format_string_pos = 0;
515
516 t = format_lex ();
517 if (t == FMT_ERROR)
518 goto fail;
519 if (t != FMT_LPAREN)
520 {
521 error = _("Missing leading left parenthesis");
522 goto syntax;
523 }
524
525 t = format_lex ();
526 if (t == FMT_ERROR)
527 goto fail;
528 if (t == FMT_RPAREN)
529 goto finished; /* Empty format is legal */
530 saved_token = t;
531
532 format_item:
533 /* In this state, the next thing has to be a format item. */
534 t = format_lex ();
535 if (t == FMT_ERROR)
536 goto fail;
537 format_item_1:
538 switch (t)
539 {
540 case FMT_STAR:
541 repeat = -1;
542 t = format_lex ();
543 if (t == FMT_ERROR)
544 goto fail;
545 if (t == FMT_LPAREN)
546 {
547 level++;
548 goto format_item;
549 }
550 error = _("Left parenthesis required after '*'");
551 goto syntax;
552
553 case FMT_POSINT:
554 repeat = value;
555 t = format_lex ();
556 if (t == FMT_ERROR)
557 goto fail;
558 if (t == FMT_LPAREN)
559 {
560 level++;
561 goto format_item;
562 }
563
564 if (t == FMT_SLASH)
565 goto optional_comma;
566
567 goto data_desc;
568
569 case FMT_LPAREN:
570 level++;
571 goto format_item;
572
573 case FMT_SIGNED_INT:
574 case FMT_ZERO:
575 /* Signed integer can only precede a P format. */
576 t = format_lex ();
577 if (t == FMT_ERROR)
578 goto fail;
579 if (t != FMT_P)
580 {
581 error = _("Expected P edit descriptor");
582 goto syntax;
583 }
584
585 goto data_desc;
586
587 case FMT_P:
588 /* P requires a prior number. */
589 error = _("P descriptor requires leading scale factor");
590 goto syntax;
591
592 case FMT_X:
593 /* X requires a prior number if we're being pedantic. */
594 if (gfc_notify_std (GFC_STD_GNU, "Extension: X descriptor "
595 "requires leading space count at %L", &format_locus)
596 == FAILURE)
597 return FAILURE;
598 goto between_desc;
599
600 case FMT_SIGN:
601 case FMT_BLANK:
602 case FMT_DP:
603 case FMT_DC:
604 goto between_desc;
605
606 case FMT_CHAR:
607 goto extension_optional_comma;
608
609 case FMT_COLON:
610 case FMT_SLASH:
611 goto optional_comma;
612
613 case FMT_DOLLAR:
614 t = format_lex ();
615 if (t == FMT_ERROR)
616 goto fail;
617
618 if (gfc_notify_std (GFC_STD_GNU, "Extension: $ descriptor at %L",
619 &format_locus) == FAILURE)
620 return FAILURE;
621 if (t != FMT_RPAREN || level > 0)
622 {
623 gfc_warning ("$ should be the last specifier in format at %L",
624 &format_locus);
625 goto optional_comma_1;
626 }
627
628 goto finished;
629
630 case FMT_T:
631 case FMT_TL:
632 case FMT_TR:
633 case FMT_IBOZ:
634 case FMT_F:
635 case FMT_E:
636 case FMT_EXT:
637 case FMT_G:
638 case FMT_L:
639 case FMT_A:
640 case FMT_D:
641 case FMT_H:
642 goto data_desc;
643
644 case FMT_END:
645 error = unexpected_end;
646 goto syntax;
647
648 default:
649 error = unexpected_element;
650 goto syntax;
651 }
652
653 data_desc:
654 /* In this state, t must currently be a data descriptor.
655 Deal with things that can/must follow the descriptor. */
656 switch (t)
657 {
658 case FMT_SIGN:
659 case FMT_BLANK:
660 case FMT_DP:
661 case FMT_DC:
662 case FMT_X:
663 break;
664
665 case FMT_P:
666 if (pedantic)
667 {
668 t = format_lex ();
669 if (t == FMT_ERROR)
670 goto fail;
671 if (t == FMT_POSINT)
672 {
673 error = _("Repeat count cannot follow P descriptor");
674 goto syntax;
675 }
676
677 saved_token = t;
678 }
679
680 goto optional_comma;
681
682 case FMT_T:
683 case FMT_TL:
684 case FMT_TR:
685 t = format_lex ();
686 if (t != FMT_POSINT)
687 {
688 error = _("Positive width required with T descriptor");
689 goto syntax;
690 }
691 break;
692
693 case FMT_L:
694 t = format_lex ();
695 if (t == FMT_ERROR)
696 goto fail;
697 if (t == FMT_POSINT)
698 break;
699
700 switch (gfc_notification_std (GFC_STD_GNU))
701 {
702 case WARNING:
703 if (mode != MODE_FORMAT)
704 format_locus.nextc += format_string_pos;
705 gfc_warning ("Extension: Missing positive width after L "
706 "descriptor at %L", &format_locus);
707 saved_token = t;
708 break;
709
710 case ERROR:
711 error = posint_required;
712 goto syntax;
713
714 case SILENT:
715 saved_token = t;
716 break;
717
718 default:
719 gcc_unreachable ();
720 }
721 break;
722
723 case FMT_A:
724 t = format_lex ();
725 if (t == FMT_ERROR)
726 goto fail;
727 if (t == FMT_ZERO)
728 {
729 error = zero_width;
730 goto syntax;
731 }
732 if (t != FMT_POSINT)
733 saved_token = t;
734 break;
735
736 case FMT_D:
737 case FMT_E:
738 case FMT_G:
739 case FMT_EXT:
740 u = format_lex ();
741 if (t == FMT_G && u == FMT_ZERO)
742 {
743 if (is_input)
744 {
745 error = zero_width;
746 goto syntax;
747 }
748 if (gfc_notify_std (GFC_STD_F2008, "Fortran 2008: 'G0' in "
749 "format at %L", &format_locus) == FAILURE)
750 return FAILURE;
751 u = format_lex ();
752 if (u != FMT_PERIOD)
753 {
754 saved_token = u;
755 break;
756 }
757 u = format_lex ();
758 if (u != FMT_POSINT)
759 {
760 error = posint_required;
761 goto syntax;
762 }
763 u = format_lex ();
764 if (u == FMT_E)
765 {
766 error = _("E specifier not allowed with g0 descriptor");
767 goto syntax;
768 }
769 saved_token = u;
770 break;
771 }
772
773 u = format_lex ();
774 if (u == FMT_ERROR)
775 goto fail;
776 if (u != FMT_PERIOD)
777 {
778 /* Warn if -std=legacy, otherwise error. */
779 if (mode != MODE_FORMAT)
780 format_locus.nextc += format_string_pos;
781 if (gfc_option.warn_std != 0)
782 gfc_error_now ("Period required in format specifier at %L",
783 &format_locus);
784 else
785 gfc_warning ("Period required in format specifier at %L",
786 &format_locus);
787 saved_token = u;
788 break;
789 }
790
791 u = format_lex ();
792 if (u == FMT_ERROR)
793 goto fail;
794 if (u != FMT_ZERO && u != FMT_POSINT)
795 {
796 error = nonneg_required;
797 goto syntax;
798 }
799
800 if (t == FMT_D)
801 break;
802
803 /* Look for optional exponent. */
804 u = format_lex ();
805 if (u == FMT_ERROR)
806 goto fail;
807 if (u != FMT_E)
808 {
809 saved_token = u;
810 }
811 else
812 {
813 u = format_lex ();
814 if (u == FMT_ERROR)
815 goto fail;
816 if (u != FMT_POSINT)
817 {
818 error = _("Positive exponent width required");
819 goto syntax;
820 }
821 }
822
823 break;
824
825 case FMT_F:
826 t = format_lex ();
827 if (t == FMT_ERROR)
828 goto fail;
829 if (t != FMT_ZERO && t != FMT_POSINT)
830 {
831 error = nonneg_required;
832 goto syntax;
833 }
834 else if (is_input && t == FMT_ZERO)
835 {
836 error = posint_required;
837 goto syntax;
838 }
839
840 t = format_lex ();
841 if (t == FMT_ERROR)
842 goto fail;
843 if (t != FMT_PERIOD)
844 {
845 /* Warn if -std=legacy, otherwise error. */
846 if (mode != MODE_FORMAT)
847 format_locus.nextc += format_string_pos;
848 if (gfc_option.warn_std != 0)
849 {
850 error = _("Period required in format specifier at %L");
851 goto syntax;
852 }
853 gfc_warning ("Period required in format specifier at %L",
854 &format_locus);
855 saved_token = t;
856 break;
857 }
858
859 t = format_lex ();
860 if (t == FMT_ERROR)
861 goto fail;
862 if (t != FMT_ZERO && t != FMT_POSINT)
863 {
864 error = nonneg_required;
865 goto syntax;
866 }
867
868 break;
869
870 case FMT_H:
871 if (!(gfc_option.allow_std & GFC_STD_GNU) && !inhibit_warnings)
872 {
873 if (mode != MODE_FORMAT)
874 format_locus.nextc += format_string_pos;
875 gfc_warning ("The H format specifier at %L is"
876 " a Fortran 95 deleted feature", &format_locus);
877 }
878
879 if (mode == MODE_STRING)
880 {
881 format_string += value;
882 format_length -= value;
883 }
884 else
885 {
886 while (repeat >0)
887 {
888 next_char (1);
889 repeat -- ;
890 }
891 }
892 break;
893
894 case FMT_IBOZ:
895 t = format_lex ();
896 if (t == FMT_ERROR)
897 goto fail;
898 if (t != FMT_ZERO && t != FMT_POSINT)
899 {
900 error = nonneg_required;
901 goto syntax;
902 }
903 else if (is_input && t == FMT_ZERO)
904 {
905 error = posint_required;
906 goto syntax;
907 }
908
909 t = format_lex ();
910 if (t == FMT_ERROR)
911 goto fail;
912 if (t != FMT_PERIOD)
913 {
914 saved_token = t;
915 }
916 else
917 {
918 t = format_lex ();
919 if (t == FMT_ERROR)
920 goto fail;
921 if (t != FMT_ZERO && t != FMT_POSINT)
922 {
923 error = nonneg_required;
924 goto syntax;
925 }
926 }
927
928 break;
929
930 default:
931 error = unexpected_element;
932 goto syntax;
933 }
934
935 between_desc:
936 /* Between a descriptor and what comes next. */
937 t = format_lex ();
938 if (t == FMT_ERROR)
939 goto fail;
940 switch (t)
941 {
942
943 case FMT_COMMA:
944 goto format_item;
945
946 case FMT_RPAREN:
947 level--;
948 if (level < 0)
949 goto finished;
950 goto between_desc;
951
952 case FMT_COLON:
953 case FMT_SLASH:
954 goto optional_comma;
955
956 case FMT_END:
957 error = unexpected_end;
958 goto syntax;
959
960 default:
961 if (mode != MODE_FORMAT)
962 format_locus.nextc += format_string_pos;
963 if (gfc_notify_std (GFC_STD_GNU, "Extension: Missing comma at %L",
964 &format_locus) == FAILURE)
965 return FAILURE;
966 goto format_item_1;
967 }
968
969 optional_comma:
970 /* Optional comma is a weird between state where we've just finished
971 reading a colon, slash, dollar or P descriptor. */
972 t = format_lex ();
973 if (t == FMT_ERROR)
974 goto fail;
975 optional_comma_1:
976 switch (t)
977 {
978 case FMT_COMMA:
979 break;
980
981 case FMT_RPAREN:
982 level--;
983 if (level < 0)
984 goto finished;
985 goto between_desc;
986
987 default:
988 /* Assume that we have another format item. */
989 saved_token = t;
990 break;
991 }
992
993 goto format_item;
994
995 extension_optional_comma:
996 /* As a GNU extension, permit a missing comma after a string literal. */
997 t = format_lex ();
998 if (t == FMT_ERROR)
999 goto fail;
1000 switch (t)
1001 {
1002 case FMT_COMMA:
1003 break;
1004
1005 case FMT_RPAREN:
1006 level--;
1007 if (level < 0)
1008 goto finished;
1009 goto between_desc;
1010
1011 case FMT_COLON:
1012 case FMT_SLASH:
1013 goto optional_comma;
1014
1015 case FMT_END:
1016 error = unexpected_end;
1017 goto syntax;
1018
1019 default:
1020 if (mode != MODE_FORMAT)
1021 format_locus.nextc += format_string_pos;
1022 if (gfc_notify_std (GFC_STD_GNU, "Extension: Missing comma at %L",
1023 &format_locus) == FAILURE)
1024 return FAILURE;
1025 saved_token = t;
1026 break;
1027 }
1028
1029 goto format_item;
1030
1031 syntax:
1032 if (mode != MODE_FORMAT)
1033 format_locus.nextc += format_string_pos;
1034 if (error == unexpected_element)
1035 gfc_error (error, error_element, &format_locus);
1036 else
1037 gfc_error ("%s in format string at %L", error, &format_locus);
1038 fail:
1039 rv = FAILURE;
1040
1041 finished:
1042 return rv;
1043 }
1044
1045
1046 /* Given an expression node that is a constant string, see if it looks
1047 like a format string. */
1048
1049 static gfc_try
1050 check_format_string (gfc_expr *e, bool is_input)
1051 {
1052 if (!e || e->ts.type != BT_CHARACTER || e->expr_type != EXPR_CONSTANT)
1053 return SUCCESS;
1054
1055 mode = MODE_STRING;
1056 format_string = e->value.character.string;
1057
1058 /* More elaborate measures are needed to show where a problem is within a
1059 format string that has been calculated, but that's probably not worth the
1060 effort. */
1061 format_locus = e->where;
1062
1063 return check_format (is_input);
1064 }
1065
1066
1067 /************ Fortran 95 I/O statement matchers *************/
1068
1069 /* Match a FORMAT statement. This amounts to actually parsing the
1070 format descriptors in order to correctly locate the end of the
1071 format string. */
1072
1073 match
1074 gfc_match_format (void)
1075 {
1076 gfc_expr *e;
1077 locus start;
1078
1079 if (gfc_current_ns->proc_name
1080 && gfc_current_ns->proc_name->attr.flavor == FL_MODULE)
1081 {
1082 gfc_error ("Format statement in module main block at %C");
1083 return MATCH_ERROR;
1084 }
1085
1086 if (gfc_statement_label == NULL)
1087 {
1088 gfc_error ("Missing format label at %C");
1089 return MATCH_ERROR;
1090 }
1091 gfc_gobble_whitespace ();
1092
1093 mode = MODE_FORMAT;
1094 format_length = 0;
1095
1096 start = gfc_current_locus;
1097
1098 if (check_format (false) == FAILURE)
1099 return MATCH_ERROR;
1100
1101 if (gfc_match_eos () != MATCH_YES)
1102 {
1103 gfc_syntax_error (ST_FORMAT);
1104 return MATCH_ERROR;
1105 }
1106
1107 /* The label doesn't get created until after the statement is done
1108 being matched, so we have to leave the string for later. */
1109
1110 gfc_current_locus = start; /* Back to the beginning */
1111
1112 new_st.loc = start;
1113 new_st.op = EXEC_NOP;
1114
1115 e = gfc_get_expr();
1116 e->expr_type = EXPR_CONSTANT;
1117 e->ts.type = BT_CHARACTER;
1118 e->ts.kind = gfc_default_character_kind;
1119 e->where = start;
1120 e->value.character.string = format_string
1121 = gfc_get_wide_string (format_length + 1);
1122 e->value.character.length = format_length;
1123 gfc_statement_label->format = e;
1124
1125 mode = MODE_COPY;
1126 check_format (false); /* Guaranteed to succeed */
1127 gfc_match_eos (); /* Guaranteed to succeed */
1128
1129 return MATCH_YES;
1130 }
1131
1132
1133 /* Match an expression I/O tag of some sort. */
1134
1135 static match
1136 match_etag (const io_tag *tag, gfc_expr **v)
1137 {
1138 gfc_expr *result;
1139 match m;
1140
1141 m = gfc_match (tag->spec);
1142 if (m != MATCH_YES)
1143 return m;
1144
1145 m = gfc_match (tag->value, &result);
1146 if (m != MATCH_YES)
1147 {
1148 gfc_error ("Invalid value for %s specification at %C", tag->name);
1149 return MATCH_ERROR;
1150 }
1151
1152 if (*v != NULL)
1153 {
1154 gfc_error ("Duplicate %s specification at %C", tag->name);
1155 gfc_free_expr (result);
1156 return MATCH_ERROR;
1157 }
1158
1159 *v = result;
1160 return MATCH_YES;
1161 }
1162
1163
1164 /* Match a variable I/O tag of some sort. */
1165
1166 static match
1167 match_vtag (const io_tag *tag, gfc_expr **v)
1168 {
1169 gfc_expr *result;
1170 match m;
1171
1172 m = gfc_match (tag->spec);
1173 if (m != MATCH_YES)
1174 return m;
1175
1176 m = gfc_match (tag->value, &result);
1177 if (m != MATCH_YES)
1178 {
1179 gfc_error ("Invalid value for %s specification at %C", tag->name);
1180 return MATCH_ERROR;
1181 }
1182
1183 if (*v != NULL)
1184 {
1185 gfc_error ("Duplicate %s specification at %C", tag->name);
1186 gfc_free_expr (result);
1187 return MATCH_ERROR;
1188 }
1189
1190 if (result->symtree->n.sym->attr.intent == INTENT_IN)
1191 {
1192 gfc_error ("Variable %s cannot be INTENT(IN) at %C", tag->name);
1193 gfc_free_expr (result);
1194 return MATCH_ERROR;
1195 }
1196
1197 if (gfc_pure (NULL) && gfc_impure_variable (result->symtree->n.sym))
1198 {
1199 gfc_error ("Variable %s cannot be assigned in PURE procedure at %C",
1200 tag->name);
1201 gfc_free_expr (result);
1202 return MATCH_ERROR;
1203 }
1204
1205 *v = result;
1206 return MATCH_YES;
1207 }
1208
1209
1210 /* Match I/O tags that cause variables to become redefined. */
1211
1212 static match
1213 match_out_tag (const io_tag *tag, gfc_expr **result)
1214 {
1215 match m;
1216
1217 m = match_vtag (tag, result);
1218 if (m == MATCH_YES)
1219 gfc_check_do_variable ((*result)->symtree);
1220
1221 return m;
1222 }
1223
1224
1225 /* Match a label I/O tag. */
1226
1227 static match
1228 match_ltag (const io_tag *tag, gfc_st_label ** label)
1229 {
1230 match m;
1231 gfc_st_label *old;
1232
1233 old = *label;
1234 m = gfc_match (tag->spec);
1235 if (m != MATCH_YES)
1236 return m;
1237
1238 m = gfc_match (tag->value, label);
1239 if (m != MATCH_YES)
1240 {
1241 gfc_error ("Invalid value for %s specification at %C", tag->name);
1242 return MATCH_ERROR;
1243 }
1244
1245 if (old)
1246 {
1247 gfc_error ("Duplicate %s label specification at %C", tag->name);
1248 return MATCH_ERROR;
1249 }
1250
1251 if (gfc_reference_st_label (*label, ST_LABEL_TARGET) == FAILURE)
1252 return MATCH_ERROR;
1253
1254 return m;
1255 }
1256
1257
1258 /* Resolution of the FORMAT tag, to be called from resolve_tag. */
1259
1260 static gfc_try
1261 resolve_tag_format (const gfc_expr *e)
1262 {
1263 if (e->expr_type == EXPR_CONSTANT
1264 && (e->ts.type != BT_CHARACTER
1265 || e->ts.kind != gfc_default_character_kind))
1266 {
1267 gfc_error ("Constant expression in FORMAT tag at %L must be "
1268 "of type default CHARACTER", &e->where);
1269 return FAILURE;
1270 }
1271
1272 /* If e's rank is zero and e is not an element of an array, it should be
1273 of integer or character type. The integer variable should be
1274 ASSIGNED. */
1275 if (e->rank == 0
1276 && (e->expr_type != EXPR_VARIABLE
1277 || e->symtree == NULL
1278 || e->symtree->n.sym->as == NULL
1279 || e->symtree->n.sym->as->rank == 0))
1280 {
1281 if (e->ts.type != BT_CHARACTER && e->ts.type != BT_INTEGER)
1282 {
1283 gfc_error ("FORMAT tag at %L must be of type CHARACTER or INTEGER",
1284 &e->where);
1285 return FAILURE;
1286 }
1287 else if (e->ts.type == BT_INTEGER && e->expr_type == EXPR_VARIABLE)
1288 {
1289 if (gfc_notify_std (GFC_STD_F95_DEL, "Deleted feature: ASSIGNED "
1290 "variable in FORMAT tag at %L", &e->where)
1291 == FAILURE)
1292 return FAILURE;
1293 if (e->symtree->n.sym->attr.assign != 1)
1294 {
1295 gfc_error ("Variable '%s' at %L has not been assigned a "
1296 "format label", e->symtree->n.sym->name, &e->where);
1297 return FAILURE;
1298 }
1299 }
1300 else if (e->ts.type == BT_INTEGER)
1301 {
1302 gfc_error ("Scalar '%s' in FORMAT tag at %L is not an ASSIGNED "
1303 "variable", gfc_basic_typename (e->ts.type), &e->where);
1304 return FAILURE;
1305 }
1306
1307 return SUCCESS;
1308 }
1309
1310 /* If rank is nonzero and type is not character, we allow it under GFC_STD_LEGACY.
1311 It may be assigned an Hollerith constant. */
1312 if (e->ts.type != BT_CHARACTER)
1313 {
1314 if (gfc_notify_std (GFC_STD_LEGACY, "Extension: Non-character "
1315 "in FORMAT tag at %L", &e->where) == FAILURE)
1316 return FAILURE;
1317
1318 if (e->rank == 0 && e->symtree->n.sym->as->type == AS_ASSUMED_SHAPE)
1319 {
1320 gfc_error ("Non-character assumed shape array element in FORMAT"
1321 " tag at %L", &e->where);
1322 return FAILURE;
1323 }
1324
1325 if (e->rank == 0 && e->symtree->n.sym->as->type == AS_ASSUMED_SIZE)
1326 {
1327 gfc_error ("Non-character assumed size array element in FORMAT"
1328 " tag at %L", &e->where);
1329 return FAILURE;
1330 }
1331
1332 if (e->rank == 0 && e->symtree->n.sym->attr.pointer)
1333 {
1334 gfc_error ("Non-character pointer array element in FORMAT tag at %L",
1335 &e->where);
1336 return FAILURE;
1337 }
1338 }
1339
1340 return SUCCESS;
1341 }
1342
1343
1344 /* Do expression resolution and type-checking on an expression tag. */
1345
1346 static gfc_try
1347 resolve_tag (const io_tag *tag, gfc_expr *e)
1348 {
1349 if (e == NULL)
1350 return SUCCESS;
1351
1352 if (gfc_resolve_expr (e) == FAILURE)
1353 return FAILURE;
1354
1355 if (tag == &tag_format)
1356 return resolve_tag_format (e);
1357
1358 if (e->ts.type != tag->type)
1359 {
1360 gfc_error ("%s tag at %L must be of type %s", tag->name,
1361 &e->where, gfc_basic_typename (tag->type));
1362 return FAILURE;
1363 }
1364
1365 if (e->rank != 0)
1366 {
1367 gfc_error ("%s tag at %L must be scalar", tag->name, &e->where);
1368 return FAILURE;
1369 }
1370
1371 if (tag == &tag_iomsg)
1372 {
1373 if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: IOMSG tag at %L",
1374 &e->where) == FAILURE)
1375 return FAILURE;
1376 }
1377
1378 if ((tag == &tag_iostat || tag == &tag_size || tag == &tag_iolength)
1379 && e->ts.kind != gfc_default_integer_kind)
1380 {
1381 if (gfc_notify_std (GFC_STD_F2003, "Fortran 95 requires default "
1382 "INTEGER in %s tag at %L", tag->name, &e->where)
1383 == FAILURE)
1384 return FAILURE;
1385 }
1386
1387 if (tag == &tag_convert)
1388 {
1389 if (gfc_notify_std (GFC_STD_GNU, "Extension: CONVERT tag at %L",
1390 &e->where) == FAILURE)
1391 return FAILURE;
1392 }
1393
1394 return SUCCESS;
1395 }
1396
1397
1398 /* Match a single tag of an OPEN statement. */
1399
1400 static match
1401 match_open_element (gfc_open *open)
1402 {
1403 match m;
1404
1405 m = match_etag (&tag_e_async, &open->asynchronous);
1406 if (m != MATCH_NO)
1407 return m;
1408 m = match_etag (&tag_unit, &open->unit);
1409 if (m != MATCH_NO)
1410 return m;
1411 m = match_out_tag (&tag_iomsg, &open->iomsg);
1412 if (m != MATCH_NO)
1413 return m;
1414 m = match_out_tag (&tag_iostat, &open->iostat);
1415 if (m != MATCH_NO)
1416 return m;
1417 m = match_etag (&tag_file, &open->file);
1418 if (m != MATCH_NO)
1419 return m;
1420 m = match_etag (&tag_status, &open->status);
1421 if (m != MATCH_NO)
1422 return m;
1423 m = match_etag (&tag_e_access, &open->access);
1424 if (m != MATCH_NO)
1425 return m;
1426 m = match_etag (&tag_e_form, &open->form);
1427 if (m != MATCH_NO)
1428 return m;
1429 m = match_etag (&tag_e_recl, &open->recl);
1430 if (m != MATCH_NO)
1431 return m;
1432 m = match_etag (&tag_e_blank, &open->blank);
1433 if (m != MATCH_NO)
1434 return m;
1435 m = match_etag (&tag_e_position, &open->position);
1436 if (m != MATCH_NO)
1437 return m;
1438 m = match_etag (&tag_e_action, &open->action);
1439 if (m != MATCH_NO)
1440 return m;
1441 m = match_etag (&tag_e_delim, &open->delim);
1442 if (m != MATCH_NO)
1443 return m;
1444 m = match_etag (&tag_e_pad, &open->pad);
1445 if (m != MATCH_NO)
1446 return m;
1447 m = match_etag (&tag_e_decimal, &open->decimal);
1448 if (m != MATCH_NO)
1449 return m;
1450 m = match_etag (&tag_e_encoding, &open->encoding);
1451 if (m != MATCH_NO)
1452 return m;
1453 m = match_etag (&tag_e_round, &open->round);
1454 if (m != MATCH_NO)
1455 return m;
1456 m = match_etag (&tag_e_sign, &open->sign);
1457 if (m != MATCH_NO)
1458 return m;
1459 m = match_ltag (&tag_err, &open->err);
1460 if (m != MATCH_NO)
1461 return m;
1462 m = match_etag (&tag_convert, &open->convert);
1463 if (m != MATCH_NO)
1464 return m;
1465 m = match_out_tag (&tag_newunit, &open->newunit);
1466 if (m != MATCH_NO)
1467 return m;
1468
1469 return MATCH_NO;
1470 }
1471
1472
1473 /* Free the gfc_open structure and all the expressions it contains. */
1474
1475 void
1476 gfc_free_open (gfc_open *open)
1477 {
1478 if (open == NULL)
1479 return;
1480
1481 gfc_free_expr (open->unit);
1482 gfc_free_expr (open->iomsg);
1483 gfc_free_expr (open->iostat);
1484 gfc_free_expr (open->file);
1485 gfc_free_expr (open->status);
1486 gfc_free_expr (open->access);
1487 gfc_free_expr (open->form);
1488 gfc_free_expr (open->recl);
1489 gfc_free_expr (open->blank);
1490 gfc_free_expr (open->position);
1491 gfc_free_expr (open->action);
1492 gfc_free_expr (open->delim);
1493 gfc_free_expr (open->pad);
1494 gfc_free_expr (open->decimal);
1495 gfc_free_expr (open->encoding);
1496 gfc_free_expr (open->round);
1497 gfc_free_expr (open->sign);
1498 gfc_free_expr (open->convert);
1499 gfc_free_expr (open->asynchronous);
1500 gfc_free_expr (open->newunit);
1501 gfc_free (open);
1502 }
1503
1504
1505 /* Resolve everything in a gfc_open structure. */
1506
1507 gfc_try
1508 gfc_resolve_open (gfc_open *open)
1509 {
1510
1511 RESOLVE_TAG (&tag_unit, open->unit);
1512 RESOLVE_TAG (&tag_iomsg, open->iomsg);
1513 RESOLVE_TAG (&tag_iostat, open->iostat);
1514 RESOLVE_TAG (&tag_file, open->file);
1515 RESOLVE_TAG (&tag_status, open->status);
1516 RESOLVE_TAG (&tag_e_access, open->access);
1517 RESOLVE_TAG (&tag_e_form, open->form);
1518 RESOLVE_TAG (&tag_e_recl, open->recl);
1519 RESOLVE_TAG (&tag_e_blank, open->blank);
1520 RESOLVE_TAG (&tag_e_position, open->position);
1521 RESOLVE_TAG (&tag_e_action, open->action);
1522 RESOLVE_TAG (&tag_e_delim, open->delim);
1523 RESOLVE_TAG (&tag_e_pad, open->pad);
1524 RESOLVE_TAG (&tag_e_decimal, open->decimal);
1525 RESOLVE_TAG (&tag_e_encoding, open->encoding);
1526 RESOLVE_TAG (&tag_e_async, open->asynchronous);
1527 RESOLVE_TAG (&tag_e_round, open->round);
1528 RESOLVE_TAG (&tag_e_sign, open->sign);
1529 RESOLVE_TAG (&tag_convert, open->convert);
1530 RESOLVE_TAG (&tag_newunit, open->newunit);
1531
1532 if (gfc_reference_st_label (open->err, ST_LABEL_TARGET) == FAILURE)
1533 return FAILURE;
1534
1535 return SUCCESS;
1536 }
1537
1538
1539 /* Check if a given value for a SPECIFIER is either in the list of values
1540 allowed in F95 or F2003, issuing an error message and returning a zero
1541 value if it is not allowed. */
1542
1543 static int
1544 compare_to_allowed_values (const char *specifier, const char *allowed[],
1545 const char *allowed_f2003[],
1546 const char *allowed_gnu[], gfc_char_t *value,
1547 const char *statement, bool warn)
1548 {
1549 int i;
1550 unsigned int len;
1551
1552 len = gfc_wide_strlen (value);
1553 if (len > 0)
1554 {
1555 for (len--; len > 0; len--)
1556 if (value[len] != ' ')
1557 break;
1558 len++;
1559 }
1560
1561 for (i = 0; allowed[i]; i++)
1562 if (len == strlen (allowed[i])
1563 && gfc_wide_strncasecmp (value, allowed[i], strlen (allowed[i])) == 0)
1564 return 1;
1565
1566 for (i = 0; allowed_f2003 && allowed_f2003[i]; i++)
1567 if (len == strlen (allowed_f2003[i])
1568 && gfc_wide_strncasecmp (value, allowed_f2003[i],
1569 strlen (allowed_f2003[i])) == 0)
1570 {
1571 notification n = gfc_notification_std (GFC_STD_F2003);
1572
1573 if (n == WARNING || (warn && n == ERROR))
1574 {
1575 gfc_warning ("Fortran 2003: %s specifier in %s statement at %C "
1576 "has value '%s'", specifier, statement,
1577 allowed_f2003[i]);
1578 return 1;
1579 }
1580 else
1581 if (n == ERROR)
1582 {
1583 gfc_notify_std (GFC_STD_F2003, "Fortran 2003: %s specifier in "
1584 "%s statement at %C has value '%s'", specifier,
1585 statement, allowed_f2003[i]);
1586 return 0;
1587 }
1588
1589 /* n == SILENT */
1590 return 1;
1591 }
1592
1593 for (i = 0; allowed_gnu && allowed_gnu[i]; i++)
1594 if (len == strlen (allowed_gnu[i])
1595 && gfc_wide_strncasecmp (value, allowed_gnu[i],
1596 strlen (allowed_gnu[i])) == 0)
1597 {
1598 notification n = gfc_notification_std (GFC_STD_GNU);
1599
1600 if (n == WARNING || (warn && n == ERROR))
1601 {
1602 gfc_warning ("Extension: %s specifier in %s statement at %C "
1603 "has value '%s'", specifier, statement,
1604 allowed_gnu[i]);
1605 return 1;
1606 }
1607 else
1608 if (n == ERROR)
1609 {
1610 gfc_notify_std (GFC_STD_GNU, "Extension: %s specifier in "
1611 "%s statement at %C has value '%s'", specifier,
1612 statement, allowed_gnu[i]);
1613 return 0;
1614 }
1615
1616 /* n == SILENT */
1617 return 1;
1618 }
1619
1620 if (warn)
1621 {
1622 char *s = gfc_widechar_to_char (value, -1);
1623 gfc_warning ("%s specifier in %s statement at %C has invalid value '%s'",
1624 specifier, statement, s);
1625 gfc_free (s);
1626 return 1;
1627 }
1628 else
1629 {
1630 char *s = gfc_widechar_to_char (value, -1);
1631 gfc_error ("%s specifier in %s statement at %C has invalid value '%s'",
1632 specifier, statement, s);
1633 gfc_free (s);
1634 return 0;
1635 }
1636 }
1637
1638
1639 /* Match an OPEN statement. */
1640
1641 match
1642 gfc_match_open (void)
1643 {
1644 gfc_open *open;
1645 match m;
1646 bool warn;
1647
1648 m = gfc_match_char ('(');
1649 if (m == MATCH_NO)
1650 return m;
1651
1652 open = XCNEW (gfc_open);
1653
1654 m = match_open_element (open);
1655
1656 if (m == MATCH_ERROR)
1657 goto cleanup;
1658 if (m == MATCH_NO)
1659 {
1660 m = gfc_match_expr (&open->unit);
1661 if (m == MATCH_NO)
1662 goto syntax;
1663 if (m == MATCH_ERROR)
1664 goto cleanup;
1665 }
1666
1667 for (;;)
1668 {
1669 if (gfc_match_char (')') == MATCH_YES)
1670 break;
1671 if (gfc_match_char (',') != MATCH_YES)
1672 goto syntax;
1673
1674 m = match_open_element (open);
1675 if (m == MATCH_ERROR)
1676 goto cleanup;
1677 if (m == MATCH_NO)
1678 goto syntax;
1679 }
1680
1681 if (gfc_match_eos () == MATCH_NO)
1682 goto syntax;
1683
1684 if (gfc_pure (NULL))
1685 {
1686 gfc_error ("OPEN statement not allowed in PURE procedure at %C");
1687 goto cleanup;
1688 }
1689
1690 warn = (open->err || open->iostat) ? true : false;
1691
1692 /* Checks on NEWUNIT specifier. */
1693 if (open->newunit)
1694 {
1695 if (open->unit)
1696 {
1697 gfc_error ("UNIT specifier not allowed with NEWUNIT at %C");
1698 goto cleanup;
1699 }
1700
1701 if (!(open->file || (open->status
1702 && gfc_wide_strncasecmp (open->status->value.character.string,
1703 "scratch", 7) == 0)))
1704 {
1705 gfc_error ("NEWUNIT specifier must have FILE= "
1706 "or STATUS='scratch' at %C");
1707 goto cleanup;
1708 }
1709 }
1710
1711 /* Checks on the ACCESS specifier. */
1712 if (open->access && open->access->expr_type == EXPR_CONSTANT)
1713 {
1714 static const char *access_f95[] = { "SEQUENTIAL", "DIRECT", NULL };
1715 static const char *access_f2003[] = { "STREAM", NULL };
1716 static const char *access_gnu[] = { "APPEND", NULL };
1717
1718 if (!compare_to_allowed_values ("ACCESS", access_f95, access_f2003,
1719 access_gnu,
1720 open->access->value.character.string,
1721 "OPEN", warn))
1722 goto cleanup;
1723 }
1724
1725 /* Checks on the ACTION specifier. */
1726 if (open->action && open->action->expr_type == EXPR_CONSTANT)
1727 {
1728 static const char *action[] = { "READ", "WRITE", "READWRITE", NULL };
1729
1730 if (!compare_to_allowed_values ("ACTION", action, NULL, NULL,
1731 open->action->value.character.string,
1732 "OPEN", warn))
1733 goto cleanup;
1734 }
1735
1736 /* Checks on the ASYNCHRONOUS specifier. */
1737 if (open->asynchronous)
1738 {
1739 if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: ASYNCHRONOUS= at %C "
1740 "not allowed in Fortran 95") == FAILURE)
1741 goto cleanup;
1742
1743 if (open->asynchronous->expr_type == EXPR_CONSTANT)
1744 {
1745 static const char * asynchronous[] = { "YES", "NO", NULL };
1746
1747 if (!compare_to_allowed_values ("ASYNCHRONOUS", asynchronous,
1748 NULL, NULL, open->asynchronous->value.character.string,
1749 "OPEN", warn))
1750 goto cleanup;
1751 }
1752 }
1753
1754 /* Checks on the BLANK specifier. */
1755 if (open->blank)
1756 {
1757 if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: BLANK= at %C "
1758 "not allowed in Fortran 95") == FAILURE)
1759 goto cleanup;
1760
1761 if (open->blank->expr_type == EXPR_CONSTANT)
1762 {
1763 static const char *blank[] = { "ZERO", "NULL", NULL };
1764
1765 if (!compare_to_allowed_values ("BLANK", blank, NULL, NULL,
1766 open->blank->value.character.string,
1767 "OPEN", warn))
1768 goto cleanup;
1769 }
1770 }
1771
1772 /* Checks on the DECIMAL specifier. */
1773 if (open->decimal)
1774 {
1775 if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: DECIMAL= at %C "
1776 "not allowed in Fortran 95") == FAILURE)
1777 goto cleanup;
1778
1779 if (open->decimal->expr_type == EXPR_CONSTANT)
1780 {
1781 static const char * decimal[] = { "COMMA", "POINT", NULL };
1782
1783 if (!compare_to_allowed_values ("DECIMAL", decimal, NULL, NULL,
1784 open->decimal->value.character.string,
1785 "OPEN", warn))
1786 goto cleanup;
1787 }
1788 }
1789
1790 /* Checks on the DELIM specifier. */
1791 if (open->delim)
1792 {
1793 if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: DELIM= at %C "
1794 "not allowed in Fortran 95") == FAILURE)
1795 goto cleanup;
1796
1797 if (open->delim->expr_type == EXPR_CONSTANT)
1798 {
1799 static const char *delim[] = { "APOSTROPHE", "QUOTE", "NONE", NULL };
1800
1801 if (!compare_to_allowed_values ("DELIM", delim, NULL, NULL,
1802 open->delim->value.character.string,
1803 "OPEN", warn))
1804 goto cleanup;
1805 }
1806 }
1807
1808 /* Checks on the ENCODING specifier. */
1809 if (open->encoding)
1810 {
1811 if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: ENCODING= at %C "
1812 "not allowed in Fortran 95") == FAILURE)
1813 goto cleanup;
1814
1815 if (open->encoding->expr_type == EXPR_CONSTANT)
1816 {
1817 static const char * encoding[] = { "DEFAULT", "UTF-8", NULL };
1818
1819 if (!compare_to_allowed_values ("ENCODING", encoding, NULL, NULL,
1820 open->encoding->value.character.string,
1821 "OPEN", warn))
1822 goto cleanup;
1823 }
1824 }
1825
1826 /* Checks on the FORM specifier. */
1827 if (open->form && open->form->expr_type == EXPR_CONSTANT)
1828 {
1829 static const char *form[] = { "FORMATTED", "UNFORMATTED", NULL };
1830
1831 if (!compare_to_allowed_values ("FORM", form, NULL, NULL,
1832 open->form->value.character.string,
1833 "OPEN", warn))
1834 goto cleanup;
1835 }
1836
1837 /* Checks on the PAD specifier. */
1838 if (open->pad && open->pad->expr_type == EXPR_CONSTANT)
1839 {
1840 static const char *pad[] = { "YES", "NO", NULL };
1841
1842 if (!compare_to_allowed_values ("PAD", pad, NULL, NULL,
1843 open->pad->value.character.string,
1844 "OPEN", warn))
1845 goto cleanup;
1846 }
1847
1848 /* Checks on the POSITION specifier. */
1849 if (open->position && open->position->expr_type == EXPR_CONSTANT)
1850 {
1851 static const char *position[] = { "ASIS", "REWIND", "APPEND", NULL };
1852
1853 if (!compare_to_allowed_values ("POSITION", position, NULL, NULL,
1854 open->position->value.character.string,
1855 "OPEN", warn))
1856 goto cleanup;
1857 }
1858
1859 /* Checks on the ROUND specifier. */
1860 if (open->round)
1861 {
1862 /* When implemented, change the following to use gfc_notify_std F2003. */
1863 gfc_error ("Fortran F2003: ROUND= specifier at %C not implemented");
1864 goto cleanup;
1865
1866 if (open->round->expr_type == EXPR_CONSTANT)
1867 {
1868 static const char * round[] = { "UP", "DOWN", "ZERO", "NEAREST",
1869 "COMPATIBLE", "PROCESSOR_DEFINED",
1870 NULL };
1871
1872 if (!compare_to_allowed_values ("ROUND", round, NULL, NULL,
1873 open->round->value.character.string,
1874 "OPEN", warn))
1875 goto cleanup;
1876 }
1877 }
1878
1879 /* Checks on the SIGN specifier. */
1880 if (open->sign)
1881 {
1882 if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: SIGN= at %C "
1883 "not allowed in Fortran 95") == FAILURE)
1884 goto cleanup;
1885
1886 if (open->sign->expr_type == EXPR_CONSTANT)
1887 {
1888 static const char * sign[] = { "PLUS", "SUPPRESS", "PROCESSOR_DEFINED",
1889 NULL };
1890
1891 if (!compare_to_allowed_values ("SIGN", sign, NULL, NULL,
1892 open->sign->value.character.string,
1893 "OPEN", warn))
1894 goto cleanup;
1895 }
1896 }
1897
1898 #define warn_or_error(...) \
1899 { \
1900 if (warn) \
1901 gfc_warning (__VA_ARGS__); \
1902 else \
1903 { \
1904 gfc_error (__VA_ARGS__); \
1905 goto cleanup; \
1906 } \
1907 }
1908
1909 /* Checks on the RECL specifier. */
1910 if (open->recl && open->recl->expr_type == EXPR_CONSTANT
1911 && open->recl->ts.type == BT_INTEGER
1912 && mpz_sgn (open->recl->value.integer) != 1)
1913 {
1914 warn_or_error ("RECL in OPEN statement at %C must be positive");
1915 }
1916
1917 /* Checks on the STATUS specifier. */
1918 if (open->status && open->status->expr_type == EXPR_CONSTANT)
1919 {
1920 static const char *status[] = { "OLD", "NEW", "SCRATCH",
1921 "REPLACE", "UNKNOWN", NULL };
1922
1923 if (!compare_to_allowed_values ("STATUS", status, NULL, NULL,
1924 open->status->value.character.string,
1925 "OPEN", warn))
1926 goto cleanup;
1927
1928 /* F2003, 9.4.5: If the STATUS= specifier has the value NEW or REPLACE,
1929 the FILE= specifier shall appear. */
1930 if (open->file == NULL
1931 && (gfc_wide_strncasecmp (open->status->value.character.string,
1932 "replace", 7) == 0
1933 || gfc_wide_strncasecmp (open->status->value.character.string,
1934 "new", 3) == 0))
1935 {
1936 char *s = gfc_widechar_to_char (open->status->value.character.string,
1937 -1);
1938 warn_or_error ("The STATUS specified in OPEN statement at %C is "
1939 "'%s' and no FILE specifier is present", s);
1940 gfc_free (s);
1941 }
1942
1943 /* F2003, 9.4.5: If the STATUS= specifier has the value SCRATCH,
1944 the FILE= specifier shall not appear. */
1945 if (gfc_wide_strncasecmp (open->status->value.character.string,
1946 "scratch", 7) == 0 && open->file)
1947 {
1948 warn_or_error ("The STATUS specified in OPEN statement at %C "
1949 "cannot have the value SCRATCH if a FILE specifier "
1950 "is present");
1951 }
1952 }
1953
1954 /* Things that are not allowed for unformatted I/O. */
1955 if (open->form && open->form->expr_type == EXPR_CONSTANT
1956 && (open->delim || open->decimal || open->encoding || open->round
1957 || open->sign || open->pad || open->blank)
1958 && gfc_wide_strncasecmp (open->form->value.character.string,
1959 "unformatted", 11) == 0)
1960 {
1961 const char *spec = (open->delim ? "DELIM "
1962 : (open->pad ? "PAD " : open->blank
1963 ? "BLANK " : ""));
1964
1965 warn_or_error ("%s specifier at %C not allowed in OPEN statement for "
1966 "unformatted I/O", spec);
1967 }
1968
1969 if (open->recl && open->access && open->access->expr_type == EXPR_CONSTANT
1970 && gfc_wide_strncasecmp (open->access->value.character.string,
1971 "stream", 6) == 0)
1972 {
1973 warn_or_error ("RECL specifier not allowed in OPEN statement at %C for "
1974 "stream I/O");
1975 }
1976
1977 if (open->position
1978 && open->access && open->access->expr_type == EXPR_CONSTANT
1979 && !(gfc_wide_strncasecmp (open->access->value.character.string,
1980 "sequential", 10) == 0
1981 || gfc_wide_strncasecmp (open->access->value.character.string,
1982 "stream", 6) == 0
1983 || gfc_wide_strncasecmp (open->access->value.character.string,
1984 "append", 6) == 0))
1985 {
1986 warn_or_error ("POSITION specifier in OPEN statement at %C only allowed "
1987 "for stream or sequential ACCESS");
1988 }
1989
1990 #undef warn_or_error
1991
1992 new_st.op = EXEC_OPEN;
1993 new_st.ext.open = open;
1994 return MATCH_YES;
1995
1996 syntax:
1997 gfc_syntax_error (ST_OPEN);
1998
1999 cleanup:
2000 gfc_free_open (open);
2001 return MATCH_ERROR;
2002 }
2003
2004
2005 /* Free a gfc_close structure an all its expressions. */
2006
2007 void
2008 gfc_free_close (gfc_close *close)
2009 {
2010 if (close == NULL)
2011 return;
2012
2013 gfc_free_expr (close->unit);
2014 gfc_free_expr (close->iomsg);
2015 gfc_free_expr (close->iostat);
2016 gfc_free_expr (close->status);
2017 gfc_free (close);
2018 }
2019
2020
2021 /* Match elements of a CLOSE statement. */
2022
2023 static match
2024 match_close_element (gfc_close *close)
2025 {
2026 match m;
2027
2028 m = match_etag (&tag_unit, &close->unit);
2029 if (m != MATCH_NO)
2030 return m;
2031 m = match_etag (&tag_status, &close->status);
2032 if (m != MATCH_NO)
2033 return m;
2034 m = match_out_tag (&tag_iomsg, &close->iomsg);
2035 if (m != MATCH_NO)
2036 return m;
2037 m = match_out_tag (&tag_iostat, &close->iostat);
2038 if (m != MATCH_NO)
2039 return m;
2040 m = match_ltag (&tag_err, &close->err);
2041 if (m != MATCH_NO)
2042 return m;
2043
2044 return MATCH_NO;
2045 }
2046
2047
2048 /* Match a CLOSE statement. */
2049
2050 match
2051 gfc_match_close (void)
2052 {
2053 gfc_close *close;
2054 match m;
2055 bool warn;
2056
2057 m = gfc_match_char ('(');
2058 if (m == MATCH_NO)
2059 return m;
2060
2061 close = XCNEW (gfc_close);
2062
2063 m = match_close_element (close);
2064
2065 if (m == MATCH_ERROR)
2066 goto cleanup;
2067 if (m == MATCH_NO)
2068 {
2069 m = gfc_match_expr (&close->unit);
2070 if (m == MATCH_NO)
2071 goto syntax;
2072 if (m == MATCH_ERROR)
2073 goto cleanup;
2074 }
2075
2076 for (;;)
2077 {
2078 if (gfc_match_char (')') == MATCH_YES)
2079 break;
2080 if (gfc_match_char (',') != MATCH_YES)
2081 goto syntax;
2082
2083 m = match_close_element (close);
2084 if (m == MATCH_ERROR)
2085 goto cleanup;
2086 if (m == MATCH_NO)
2087 goto syntax;
2088 }
2089
2090 if (gfc_match_eos () == MATCH_NO)
2091 goto syntax;
2092
2093 if (gfc_pure (NULL))
2094 {
2095 gfc_error ("CLOSE statement not allowed in PURE procedure at %C");
2096 goto cleanup;
2097 }
2098
2099 warn = (close->iostat || close->err) ? true : false;
2100
2101 /* Checks on the STATUS specifier. */
2102 if (close->status && close->status->expr_type == EXPR_CONSTANT)
2103 {
2104 static const char *status[] = { "KEEP", "DELETE", NULL };
2105
2106 if (!compare_to_allowed_values ("STATUS", status, NULL, NULL,
2107 close->status->value.character.string,
2108 "CLOSE", warn))
2109 goto cleanup;
2110 }
2111
2112 new_st.op = EXEC_CLOSE;
2113 new_st.ext.close = close;
2114 return MATCH_YES;
2115
2116 syntax:
2117 gfc_syntax_error (ST_CLOSE);
2118
2119 cleanup:
2120 gfc_free_close (close);
2121 return MATCH_ERROR;
2122 }
2123
2124
2125 /* Resolve everything in a gfc_close structure. */
2126
2127 gfc_try
2128 gfc_resolve_close (gfc_close *close)
2129 {
2130 RESOLVE_TAG (&tag_unit, close->unit);
2131 RESOLVE_TAG (&tag_iomsg, close->iomsg);
2132 RESOLVE_TAG (&tag_iostat, close->iostat);
2133 RESOLVE_TAG (&tag_status, close->status);
2134
2135 if (gfc_reference_st_label (close->err, ST_LABEL_TARGET) == FAILURE)
2136 return FAILURE;
2137
2138 if (close->unit->expr_type == EXPR_CONSTANT
2139 && close->unit->ts.type == BT_INTEGER
2140 && mpz_sgn (close->unit->value.integer) < 0)
2141 {
2142 gfc_error ("UNIT number in CLOSE statement at %L must be non-negative",
2143 &close->unit->where);
2144 }
2145
2146 return SUCCESS;
2147 }
2148
2149
2150 /* Free a gfc_filepos structure. */
2151
2152 void
2153 gfc_free_filepos (gfc_filepos *fp)
2154 {
2155 gfc_free_expr (fp->unit);
2156 gfc_free_expr (fp->iomsg);
2157 gfc_free_expr (fp->iostat);
2158 gfc_free (fp);
2159 }
2160
2161
2162 /* Match elements of a REWIND, BACKSPACE, ENDFILE, or FLUSH statement. */
2163
2164 static match
2165 match_file_element (gfc_filepos *fp)
2166 {
2167 match m;
2168
2169 m = match_etag (&tag_unit, &fp->unit);
2170 if (m != MATCH_NO)
2171 return m;
2172 m = match_out_tag (&tag_iomsg, &fp->iomsg);
2173 if (m != MATCH_NO)
2174 return m;
2175 m = match_out_tag (&tag_iostat, &fp->iostat);
2176 if (m != MATCH_NO)
2177 return m;
2178 m = match_ltag (&tag_err, &fp->err);
2179 if (m != MATCH_NO)
2180 return m;
2181
2182 return MATCH_NO;
2183 }
2184
2185
2186 /* Match the second half of the file-positioning statements, REWIND,
2187 BACKSPACE, ENDFILE, or the FLUSH statement. */
2188
2189 static match
2190 match_filepos (gfc_statement st, gfc_exec_op op)
2191 {
2192 gfc_filepos *fp;
2193 match m;
2194
2195 fp = XCNEW (gfc_filepos);
2196
2197 if (gfc_match_char ('(') == MATCH_NO)
2198 {
2199 m = gfc_match_expr (&fp->unit);
2200 if (m == MATCH_ERROR)
2201 goto cleanup;
2202 if (m == MATCH_NO)
2203 goto syntax;
2204
2205 goto done;
2206 }
2207
2208 m = match_file_element (fp);
2209 if (m == MATCH_ERROR)
2210 goto done;
2211 if (m == MATCH_NO)
2212 {
2213 m = gfc_match_expr (&fp->unit);
2214 if (m == MATCH_ERROR)
2215 goto done;
2216 if (m == MATCH_NO)
2217 goto syntax;
2218 }
2219
2220 for (;;)
2221 {
2222 if (gfc_match_char (')') == MATCH_YES)
2223 break;
2224 if (gfc_match_char (',') != MATCH_YES)
2225 goto syntax;
2226
2227 m = match_file_element (fp);
2228 if (m == MATCH_ERROR)
2229 goto cleanup;
2230 if (m == MATCH_NO)
2231 goto syntax;
2232 }
2233
2234 done:
2235 if (gfc_match_eos () != MATCH_YES)
2236 goto syntax;
2237
2238 if (gfc_pure (NULL))
2239 {
2240 gfc_error ("%s statement not allowed in PURE procedure at %C",
2241 gfc_ascii_statement (st));
2242
2243 goto cleanup;
2244 }
2245
2246 new_st.op = op;
2247 new_st.ext.filepos = fp;
2248 return MATCH_YES;
2249
2250 syntax:
2251 gfc_syntax_error (st);
2252
2253 cleanup:
2254 gfc_free_filepos (fp);
2255 return MATCH_ERROR;
2256 }
2257
2258
2259 gfc_try
2260 gfc_resolve_filepos (gfc_filepos *fp)
2261 {
2262 RESOLVE_TAG (&tag_unit, fp->unit);
2263 RESOLVE_TAG (&tag_iostat, fp->iostat);
2264 RESOLVE_TAG (&tag_iomsg, fp->iomsg);
2265 if (gfc_reference_st_label (fp->err, ST_LABEL_TARGET) == FAILURE)
2266 return FAILURE;
2267
2268 if (fp->unit->expr_type == EXPR_CONSTANT
2269 && fp->unit->ts.type == BT_INTEGER
2270 && mpz_sgn (fp->unit->value.integer) < 0)
2271 {
2272 gfc_error ("UNIT number in statement at %L must be non-negative",
2273 &fp->unit->where);
2274 }
2275
2276 return SUCCESS;
2277 }
2278
2279
2280 /* Match the file positioning statements: ENDFILE, BACKSPACE, REWIND,
2281 and the FLUSH statement. */
2282
2283 match
2284 gfc_match_endfile (void)
2285 {
2286 return match_filepos (ST_END_FILE, EXEC_ENDFILE);
2287 }
2288
2289 match
2290 gfc_match_backspace (void)
2291 {
2292 return match_filepos (ST_BACKSPACE, EXEC_BACKSPACE);
2293 }
2294
2295 match
2296 gfc_match_rewind (void)
2297 {
2298 return match_filepos (ST_REWIND, EXEC_REWIND);
2299 }
2300
2301 match
2302 gfc_match_flush (void)
2303 {
2304 if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: FLUSH statement at %C")
2305 == FAILURE)
2306 return MATCH_ERROR;
2307
2308 return match_filepos (ST_FLUSH, EXEC_FLUSH);
2309 }
2310
2311 /******************** Data Transfer Statements *********************/
2312
2313 /* Return a default unit number. */
2314
2315 static gfc_expr *
2316 default_unit (io_kind k)
2317 {
2318 int unit;
2319
2320 if (k == M_READ)
2321 unit = 5;
2322 else
2323 unit = 6;
2324
2325 return gfc_int_expr (unit);
2326 }
2327
2328
2329 /* Match a unit specification for a data transfer statement. */
2330
2331 static match
2332 match_dt_unit (io_kind k, gfc_dt *dt)
2333 {
2334 gfc_expr *e;
2335
2336 if (gfc_match_char ('*') == MATCH_YES)
2337 {
2338 if (dt->io_unit != NULL)
2339 goto conflict;
2340
2341 dt->io_unit = default_unit (k);
2342 return MATCH_YES;
2343 }
2344
2345 if (gfc_match_expr (&e) == MATCH_YES)
2346 {
2347 if (dt->io_unit != NULL)
2348 {
2349 gfc_free_expr (e);
2350 goto conflict;
2351 }
2352
2353 dt->io_unit = e;
2354 return MATCH_YES;
2355 }
2356
2357 return MATCH_NO;
2358
2359 conflict:
2360 gfc_error ("Duplicate UNIT specification at %C");
2361 return MATCH_ERROR;
2362 }
2363
2364
2365 /* Match a format specification. */
2366
2367 static match
2368 match_dt_format (gfc_dt *dt)
2369 {
2370 locus where;
2371 gfc_expr *e;
2372 gfc_st_label *label;
2373 match m;
2374
2375 where = gfc_current_locus;
2376
2377 if (gfc_match_char ('*') == MATCH_YES)
2378 {
2379 if (dt->format_expr != NULL || dt->format_label != NULL)
2380 goto conflict;
2381
2382 dt->format_label = &format_asterisk;
2383 return MATCH_YES;
2384 }
2385
2386 if ((m = gfc_match_st_label (&label)) == MATCH_YES)
2387 {
2388 if (dt->format_expr != NULL || dt->format_label != NULL)
2389 {
2390 gfc_free_st_label (label);
2391 goto conflict;
2392 }
2393
2394 if (gfc_reference_st_label (label, ST_LABEL_FORMAT) == FAILURE)
2395 return MATCH_ERROR;
2396
2397 dt->format_label = label;
2398 return MATCH_YES;
2399 }
2400 else if (m == MATCH_ERROR)
2401 /* The label was zero or too large. Emit the correct diagnosis. */
2402 return MATCH_ERROR;
2403
2404 if (gfc_match_expr (&e) == MATCH_YES)
2405 {
2406 if (dt->format_expr != NULL || dt->format_label != NULL)
2407 {
2408 gfc_free_expr (e);
2409 goto conflict;
2410 }
2411 dt->format_expr = e;
2412 return MATCH_YES;
2413 }
2414
2415 gfc_current_locus = where; /* The only case where we have to restore */
2416
2417 return MATCH_NO;
2418
2419 conflict:
2420 gfc_error ("Duplicate format specification at %C");
2421 return MATCH_ERROR;
2422 }
2423
2424
2425 /* Traverse a namelist that is part of a READ statement to make sure
2426 that none of the variables in the namelist are INTENT(IN). Returns
2427 nonzero if we find such a variable. */
2428
2429 static int
2430 check_namelist (gfc_symbol *sym)
2431 {
2432 gfc_namelist *p;
2433
2434 for (p = sym->namelist; p; p = p->next)
2435 if (p->sym->attr.intent == INTENT_IN)
2436 {
2437 gfc_error ("Symbol '%s' in namelist '%s' is INTENT(IN) at %C",
2438 p->sym->name, sym->name);
2439 return 1;
2440 }
2441
2442 return 0;
2443 }
2444
2445
2446 /* Match a single data transfer element. */
2447
2448 static match
2449 match_dt_element (io_kind k, gfc_dt *dt)
2450 {
2451 char name[GFC_MAX_SYMBOL_LEN + 1];
2452 gfc_symbol *sym;
2453 match m;
2454
2455 if (gfc_match (" unit =") == MATCH_YES)
2456 {
2457 m = match_dt_unit (k, dt);
2458 if (m != MATCH_NO)
2459 return m;
2460 }
2461
2462 if (gfc_match (" fmt =") == MATCH_YES)
2463 {
2464 m = match_dt_format (dt);
2465 if (m != MATCH_NO)
2466 return m;
2467 }
2468
2469 if (gfc_match (" nml = %n", name) == MATCH_YES)
2470 {
2471 if (dt->namelist != NULL)
2472 {
2473 gfc_error ("Duplicate NML specification at %C");
2474 return MATCH_ERROR;
2475 }
2476
2477 if (gfc_find_symbol (name, NULL, 1, &sym))
2478 return MATCH_ERROR;
2479
2480 if (sym == NULL || sym->attr.flavor != FL_NAMELIST)
2481 {
2482 gfc_error ("Symbol '%s' at %C must be a NAMELIST group name",
2483 sym != NULL ? sym->name : name);
2484 return MATCH_ERROR;
2485 }
2486
2487 dt->namelist = sym;
2488 if (k == M_READ && check_namelist (sym))
2489 return MATCH_ERROR;
2490
2491 return MATCH_YES;
2492 }
2493
2494 m = match_etag (&tag_e_async, &dt->asynchronous);
2495 if (m != MATCH_NO)
2496 return m;
2497 m = match_etag (&tag_e_blank, &dt->blank);
2498 if (m != MATCH_NO)
2499 return m;
2500 m = match_etag (&tag_e_delim, &dt->delim);
2501 if (m != MATCH_NO)
2502 return m;
2503 m = match_etag (&tag_e_pad, &dt->pad);
2504 if (m != MATCH_NO)
2505 return m;
2506 m = match_etag (&tag_e_sign, &dt->sign);
2507 if (m != MATCH_NO)
2508 return m;
2509 m = match_etag (&tag_e_round, &dt->round);
2510 if (m != MATCH_NO)
2511 return m;
2512 m = match_out_tag (&tag_id, &dt->id);
2513 if (m != MATCH_NO)
2514 return m;
2515 m = match_etag (&tag_e_decimal, &dt->decimal);
2516 if (m != MATCH_NO)
2517 return m;
2518 m = match_etag (&tag_rec, &dt->rec);
2519 if (m != MATCH_NO)
2520 return m;
2521 m = match_etag (&tag_spos, &dt->pos);
2522 if (m != MATCH_NO)
2523 return m;
2524 m = match_out_tag (&tag_iomsg, &dt->iomsg);
2525 if (m != MATCH_NO)
2526 return m;
2527 m = match_out_tag (&tag_iostat, &dt->iostat);
2528 if (m != MATCH_NO)
2529 return m;
2530 m = match_ltag (&tag_err, &dt->err);
2531 if (m == MATCH_YES)
2532 dt->err_where = gfc_current_locus;
2533 if (m != MATCH_NO)
2534 return m;
2535 m = match_etag (&tag_advance, &dt->advance);
2536 if (m != MATCH_NO)
2537 return m;
2538 m = match_out_tag (&tag_size, &dt->size);
2539 if (m != MATCH_NO)
2540 return m;
2541
2542 m = match_ltag (&tag_end, &dt->end);
2543 if (m == MATCH_YES)
2544 {
2545 if (k == M_WRITE)
2546 {
2547 gfc_error ("END tag at %C not allowed in output statement");
2548 return MATCH_ERROR;
2549 }
2550 dt->end_where = gfc_current_locus;
2551 }
2552 if (m != MATCH_NO)
2553 return m;
2554
2555 m = match_ltag (&tag_eor, &dt->eor);
2556 if (m == MATCH_YES)
2557 dt->eor_where = gfc_current_locus;
2558 if (m != MATCH_NO)
2559 return m;
2560
2561 return MATCH_NO;
2562 }
2563
2564
2565 /* Free a data transfer structure and everything below it. */
2566
2567 void
2568 gfc_free_dt (gfc_dt *dt)
2569 {
2570 if (dt == NULL)
2571 return;
2572
2573 gfc_free_expr (dt->io_unit);
2574 gfc_free_expr (dt->format_expr);
2575 gfc_free_expr (dt->rec);
2576 gfc_free_expr (dt->advance);
2577 gfc_free_expr (dt->iomsg);
2578 gfc_free_expr (dt->iostat);
2579 gfc_free_expr (dt->size);
2580 gfc_free_expr (dt->pad);
2581 gfc_free_expr (dt->delim);
2582 gfc_free_expr (dt->sign);
2583 gfc_free_expr (dt->round);
2584 gfc_free_expr (dt->blank);
2585 gfc_free_expr (dt->decimal);
2586 gfc_free_expr (dt->extra_comma);
2587 gfc_free_expr (dt->pos);
2588 gfc_free (dt);
2589 }
2590
2591
2592 /* Resolve everything in a gfc_dt structure. */
2593
2594 gfc_try
2595 gfc_resolve_dt (gfc_dt *dt, locus *loc)
2596 {
2597 gfc_expr *e;
2598
2599 RESOLVE_TAG (&tag_format, dt->format_expr);
2600 RESOLVE_TAG (&tag_rec, dt->rec);
2601 RESOLVE_TAG (&tag_spos, dt->pos);
2602 RESOLVE_TAG (&tag_advance, dt->advance);
2603 RESOLVE_TAG (&tag_id, dt->id);
2604 RESOLVE_TAG (&tag_iomsg, dt->iomsg);
2605 RESOLVE_TAG (&tag_iostat, dt->iostat);
2606 RESOLVE_TAG (&tag_size, dt->size);
2607 RESOLVE_TAG (&tag_e_pad, dt->pad);
2608 RESOLVE_TAG (&tag_e_delim, dt->delim);
2609 RESOLVE_TAG (&tag_e_sign, dt->sign);
2610 RESOLVE_TAG (&tag_e_round, dt->round);
2611 RESOLVE_TAG (&tag_e_blank, dt->blank);
2612 RESOLVE_TAG (&tag_e_decimal, dt->decimal);
2613 RESOLVE_TAG (&tag_e_async, dt->asynchronous);
2614
2615 e = dt->io_unit;
2616 if (e == NULL)
2617 {
2618 gfc_error ("UNIT not specified at %L", loc);
2619 return FAILURE;
2620 }
2621
2622 if (gfc_resolve_expr (e) == SUCCESS
2623 && (e->ts.type != BT_INTEGER
2624 && (e->ts.type != BT_CHARACTER || e->expr_type != EXPR_VARIABLE)))
2625 {
2626 /* If there is no extra comma signifying the "format" form of the IO
2627 statement, then this must be an error. */
2628 if (!dt->extra_comma)
2629 {
2630 gfc_error ("UNIT specification at %L must be an INTEGER expression "
2631 "or a CHARACTER variable", &e->where);
2632 return FAILURE;
2633 }
2634 else
2635 {
2636 /* At this point, we have an extra comma. If io_unit has arrived as
2637 type character, we assume its really the "format" form of the I/O
2638 statement. We set the io_unit to the default unit and format to
2639 the character expression. See F95 Standard section 9.4. */
2640 io_kind k;
2641 k = dt->extra_comma->value.iokind;
2642 if (e->ts.type == BT_CHARACTER && (k == M_READ || k == M_PRINT))
2643 {
2644 dt->format_expr = dt->io_unit;
2645 dt->io_unit = default_unit (k);
2646
2647 /* Free this pointer now so that a warning/error is not triggered
2648 below for the "Extension". */
2649 gfc_free_expr (dt->extra_comma);
2650 dt->extra_comma = NULL;
2651 }
2652
2653 if (k == M_WRITE)
2654 {
2655 gfc_error ("Invalid form of WRITE statement at %L, UNIT required",
2656 &dt->extra_comma->where);
2657 return FAILURE;
2658 }
2659 }
2660 }
2661
2662 if (e->ts.type == BT_CHARACTER)
2663 {
2664 if (gfc_has_vector_index (e))
2665 {
2666 gfc_error ("Internal unit with vector subscript at %L", &e->where);
2667 return FAILURE;
2668 }
2669 }
2670
2671 if (e->rank && e->ts.type != BT_CHARACTER)
2672 {
2673 gfc_error ("External IO UNIT cannot be an array at %L", &e->where);
2674 return FAILURE;
2675 }
2676
2677 if (e->expr_type == EXPR_CONSTANT && e->ts.type == BT_INTEGER
2678 && mpz_sgn (e->value.integer) < 0)
2679 {
2680 gfc_error ("UNIT number in statement at %L must be non-negative", &e->where);
2681 return FAILURE;
2682 }
2683
2684 if (dt->extra_comma
2685 && gfc_notify_std (GFC_STD_GNU, "Extension: Comma before i/o "
2686 "item list at %L", &dt->extra_comma->where) == FAILURE)
2687 return FAILURE;
2688
2689 if (dt->err)
2690 {
2691 if (gfc_reference_st_label (dt->err, ST_LABEL_TARGET) == FAILURE)
2692 return FAILURE;
2693 if (dt->err->defined == ST_LABEL_UNKNOWN)
2694 {
2695 gfc_error ("ERR tag label %d at %L not defined",
2696 dt->err->value, &dt->err_where);
2697 return FAILURE;
2698 }
2699 }
2700
2701 if (dt->end)
2702 {
2703 if (gfc_reference_st_label (dt->end, ST_LABEL_TARGET) == FAILURE)
2704 return FAILURE;
2705 if (dt->end->defined == ST_LABEL_UNKNOWN)
2706 {
2707 gfc_error ("END tag label %d at %L not defined",
2708 dt->end->value, &dt->end_where);
2709 return FAILURE;
2710 }
2711 }
2712
2713 if (dt->eor)
2714 {
2715 if (gfc_reference_st_label (dt->eor, ST_LABEL_TARGET) == FAILURE)
2716 return FAILURE;
2717 if (dt->eor->defined == ST_LABEL_UNKNOWN)
2718 {
2719 gfc_error ("EOR tag label %d at %L not defined",
2720 dt->eor->value, &dt->eor_where);
2721 return FAILURE;
2722 }
2723 }
2724
2725 /* Check the format label actually exists. */
2726 if (dt->format_label && dt->format_label != &format_asterisk
2727 && dt->format_label->defined == ST_LABEL_UNKNOWN)
2728 {
2729 gfc_error ("FORMAT label %d at %L not defined", dt->format_label->value,
2730 &dt->format_label->where);
2731 return FAILURE;
2732 }
2733 return SUCCESS;
2734 }
2735
2736
2737 /* Given an io_kind, return its name. */
2738
2739 static const char *
2740 io_kind_name (io_kind k)
2741 {
2742 const char *name;
2743
2744 switch (k)
2745 {
2746 case M_READ:
2747 name = "READ";
2748 break;
2749 case M_WRITE:
2750 name = "WRITE";
2751 break;
2752 case M_PRINT:
2753 name = "PRINT";
2754 break;
2755 case M_INQUIRE:
2756 name = "INQUIRE";
2757 break;
2758 default:
2759 gfc_internal_error ("io_kind_name(): bad I/O-kind");
2760 }
2761
2762 return name;
2763 }
2764
2765
2766 /* Match an IO iteration statement of the form:
2767
2768 ( [<IO element> ,] <IO element>, I = <expr>, <expr> [, <expr> ] )
2769
2770 which is equivalent to a single IO element. This function is
2771 mutually recursive with match_io_element(). */
2772
2773 static match match_io_element (io_kind, gfc_code **);
2774
2775 static match
2776 match_io_iterator (io_kind k, gfc_code **result)
2777 {
2778 gfc_code *head, *tail, *new_code;
2779 gfc_iterator *iter;
2780 locus old_loc;
2781 match m;
2782 int n;
2783
2784 iter = NULL;
2785 head = NULL;
2786 old_loc = gfc_current_locus;
2787
2788 if (gfc_match_char ('(') != MATCH_YES)
2789 return MATCH_NO;
2790
2791 m = match_io_element (k, &head);
2792 tail = head;
2793
2794 if (m != MATCH_YES || gfc_match_char (',') != MATCH_YES)
2795 {
2796 m = MATCH_NO;
2797 goto cleanup;
2798 }
2799
2800 /* Can't be anything but an IO iterator. Build a list. */
2801 iter = gfc_get_iterator ();
2802
2803 for (n = 1;; n++)
2804 {
2805 m = gfc_match_iterator (iter, 0);
2806 if (m == MATCH_ERROR)
2807 goto cleanup;
2808 if (m == MATCH_YES)
2809 {
2810 gfc_check_do_variable (iter->var->symtree);
2811 break;
2812 }
2813
2814 m = match_io_element (k, &new_code);
2815 if (m == MATCH_ERROR)
2816 goto cleanup;
2817 if (m == MATCH_NO)
2818 {
2819 if (n > 2)
2820 goto syntax;
2821 goto cleanup;
2822 }
2823
2824 tail = gfc_append_code (tail, new_code);
2825
2826 if (gfc_match_char (',') != MATCH_YES)
2827 {
2828 if (n > 2)
2829 goto syntax;
2830 m = MATCH_NO;
2831 goto cleanup;
2832 }
2833 }
2834
2835 if (gfc_match_char (')') != MATCH_YES)
2836 goto syntax;
2837
2838 new_code = gfc_get_code ();
2839 new_code->op = EXEC_DO;
2840 new_code->ext.iterator = iter;
2841
2842 new_code->block = gfc_get_code ();
2843 new_code->block->op = EXEC_DO;
2844 new_code->block->next = head;
2845
2846 *result = new_code;
2847 return MATCH_YES;
2848
2849 syntax:
2850 gfc_error ("Syntax error in I/O iterator at %C");
2851 m = MATCH_ERROR;
2852
2853 cleanup:
2854 gfc_free_iterator (iter, 1);
2855 gfc_free_statements (head);
2856 gfc_current_locus = old_loc;
2857 return m;
2858 }
2859
2860
2861 /* Match a single element of an IO list, which is either a single
2862 expression or an IO Iterator. */
2863
2864 static match
2865 match_io_element (io_kind k, gfc_code **cpp)
2866 {
2867 gfc_expr *expr;
2868 gfc_code *cp;
2869 match m;
2870
2871 expr = NULL;
2872
2873 m = match_io_iterator (k, cpp);
2874 if (m == MATCH_YES)
2875 return MATCH_YES;
2876
2877 if (k == M_READ)
2878 {
2879 m = gfc_match_variable (&expr, 0);
2880 if (m == MATCH_NO)
2881 gfc_error ("Expected variable in READ statement at %C");
2882 }
2883 else
2884 {
2885 m = gfc_match_expr (&expr);
2886 if (m == MATCH_NO)
2887 gfc_error ("Expected expression in %s statement at %C",
2888 io_kind_name (k));
2889 }
2890
2891 if (m == MATCH_YES)
2892 switch (k)
2893 {
2894 case M_READ:
2895 if (expr->symtree->n.sym->attr.intent == INTENT_IN)
2896 {
2897 gfc_error ("Variable '%s' in input list at %C cannot be "
2898 "INTENT(IN)", expr->symtree->n.sym->name);
2899 m = MATCH_ERROR;
2900 }
2901
2902 if (gfc_pure (NULL)
2903 && gfc_impure_variable (expr->symtree->n.sym)
2904 && current_dt->io_unit
2905 && current_dt->io_unit->ts.type == BT_CHARACTER)
2906 {
2907 gfc_error ("Cannot read to variable '%s' in PURE procedure at %C",
2908 expr->symtree->n.sym->name);
2909 m = MATCH_ERROR;
2910 }
2911
2912 if (gfc_check_do_variable (expr->symtree))
2913 m = MATCH_ERROR;
2914
2915 break;
2916
2917 case M_WRITE:
2918 if (current_dt->io_unit
2919 && current_dt->io_unit->ts.type == BT_CHARACTER
2920 && gfc_pure (NULL)
2921 && current_dt->io_unit->expr_type == EXPR_VARIABLE
2922 && gfc_impure_variable (current_dt->io_unit->symtree->n.sym))
2923 {
2924 gfc_error ("Cannot write to internal file unit '%s' at %C "
2925 "inside a PURE procedure",
2926 current_dt->io_unit->symtree->n.sym->name);
2927 m = MATCH_ERROR;
2928 }
2929
2930 break;
2931
2932 default:
2933 break;
2934 }
2935
2936 if (m != MATCH_YES)
2937 {
2938 gfc_free_expr (expr);
2939 return MATCH_ERROR;
2940 }
2941
2942 cp = gfc_get_code ();
2943 cp->op = EXEC_TRANSFER;
2944 cp->expr1 = expr;
2945
2946 *cpp = cp;
2947 return MATCH_YES;
2948 }
2949
2950
2951 /* Match an I/O list, building gfc_code structures as we go. */
2952
2953 static match
2954 match_io_list (io_kind k, gfc_code **head_p)
2955 {
2956 gfc_code *head, *tail, *new_code;
2957 match m;
2958
2959 *head_p = head = tail = NULL;
2960 if (gfc_match_eos () == MATCH_YES)
2961 return MATCH_YES;
2962
2963 for (;;)
2964 {
2965 m = match_io_element (k, &new_code);
2966 if (m == MATCH_ERROR)
2967 goto cleanup;
2968 if (m == MATCH_NO)
2969 goto syntax;
2970
2971 tail = gfc_append_code (tail, new_code);
2972 if (head == NULL)
2973 head = new_code;
2974
2975 if (gfc_match_eos () == MATCH_YES)
2976 break;
2977 if (gfc_match_char (',') != MATCH_YES)
2978 goto syntax;
2979 }
2980
2981 *head_p = head;
2982 return MATCH_YES;
2983
2984 syntax:
2985 gfc_error ("Syntax error in %s statement at %C", io_kind_name (k));
2986
2987 cleanup:
2988 gfc_free_statements (head);
2989 return MATCH_ERROR;
2990 }
2991
2992
2993 /* Attach the data transfer end node. */
2994
2995 static void
2996 terminate_io (gfc_code *io_code)
2997 {
2998 gfc_code *c;
2999
3000 if (io_code == NULL)
3001 io_code = new_st.block;
3002
3003 c = gfc_get_code ();
3004 c->op = EXEC_DT_END;
3005
3006 /* Point to structure that is already there */
3007 c->ext.dt = new_st.ext.dt;
3008 gfc_append_code (io_code, c);
3009 }
3010
3011
3012 /* Check the constraints for a data transfer statement. The majority of the
3013 constraints appearing in 9.4 of the standard appear here. Some are handled
3014 in resolve_tag and others in gfc_resolve_dt. */
3015
3016 static match
3017 check_io_constraints (io_kind k, gfc_dt *dt, gfc_code *io_code,
3018 locus *spec_end)
3019 {
3020 #define io_constraint(condition,msg,arg)\
3021 if (condition) \
3022 {\
3023 gfc_error(msg,arg);\
3024 m = MATCH_ERROR;\
3025 }
3026
3027 match m;
3028 gfc_expr *expr;
3029 gfc_symbol *sym = NULL;
3030 bool warn, unformatted;
3031
3032 warn = (dt->err || dt->iostat) ? true : false;
3033 unformatted = dt->format_expr == NULL && dt->format_label == NULL
3034 && dt->namelist == NULL;
3035
3036 m = MATCH_YES;
3037
3038 expr = dt->io_unit;
3039 if (expr && expr->expr_type == EXPR_VARIABLE
3040 && expr->ts.type == BT_CHARACTER)
3041 {
3042 sym = expr->symtree->n.sym;
3043
3044 io_constraint (k == M_WRITE && sym->attr.intent == INTENT_IN,
3045 "Internal file at %L must not be INTENT(IN)",
3046 &expr->where);
3047
3048 io_constraint (gfc_has_vector_index (dt->io_unit),
3049 "Internal file incompatible with vector subscript at %L",
3050 &expr->where);
3051
3052 io_constraint (dt->rec != NULL,
3053 "REC tag at %L is incompatible with internal file",
3054 &dt->rec->where);
3055
3056 io_constraint (dt->pos != NULL,
3057 "POS tag at %L is incompatible with internal file",
3058 &dt->pos->where);
3059
3060 io_constraint (unformatted,
3061 "Unformatted I/O not allowed with internal unit at %L",
3062 &dt->io_unit->where);
3063
3064 io_constraint (dt->asynchronous != NULL,
3065 "ASYNCHRONOUS tag at %L not allowed with internal file",
3066 &dt->asynchronous->where);
3067
3068 if (dt->namelist != NULL)
3069 {
3070 if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: Internal file "
3071 "at %L with namelist", &expr->where)
3072 == FAILURE)
3073 m = MATCH_ERROR;
3074 }
3075
3076 io_constraint (dt->advance != NULL,
3077 "ADVANCE tag at %L is incompatible with internal file",
3078 &dt->advance->where);
3079 }
3080
3081 if (expr && expr->ts.type != BT_CHARACTER)
3082 {
3083
3084 io_constraint (gfc_pure (NULL) && (k == M_READ || k == M_WRITE),
3085 "IO UNIT in %s statement at %C must be "
3086 "an internal file in a PURE procedure",
3087 io_kind_name (k));
3088 }
3089
3090 if (k != M_READ)
3091 {
3092 io_constraint (dt->end, "END tag not allowed with output at %L",
3093 &dt->end_where);
3094
3095 io_constraint (dt->eor, "EOR tag not allowed with output at %L",
3096 &dt->eor_where);
3097
3098 io_constraint (dt->blank, "BLANK= specifier not allowed with output at %L",
3099 &dt->blank->where);
3100
3101 io_constraint (dt->pad, "PAD= specifier not allowed with output at %L",
3102 &dt->pad->where);
3103
3104 io_constraint (dt->size, "SIZE= specifier not allowed with output at %L",
3105 &dt->size->where);
3106 }
3107 else
3108 {
3109 io_constraint (dt->size && dt->advance == NULL,
3110 "SIZE tag at %L requires an ADVANCE tag",
3111 &dt->size->where);
3112
3113 io_constraint (dt->eor && dt->advance == NULL,
3114 "EOR tag at %L requires an ADVANCE tag",
3115 &dt->eor_where);
3116 }
3117
3118 if (dt->asynchronous)
3119 {
3120 static const char * asynchronous[] = { "YES", "NO", NULL };
3121
3122 if (gfc_reduce_init_expr (dt->asynchronous) != SUCCESS)
3123 {
3124 gfc_error ("ASYNCHRONOUS= specifier at %L must be an initialization "
3125 "expression", &dt->asynchronous->where);
3126 return MATCH_ERROR;
3127 }
3128
3129 if (!compare_to_allowed_values
3130 ("ASYNCHRONOUS", asynchronous, NULL, NULL,
3131 dt->asynchronous->value.character.string,
3132 io_kind_name (k), warn))
3133 return MATCH_ERROR;
3134 }
3135
3136 if (dt->id)
3137 {
3138 bool not_yes
3139 = !dt->asynchronous
3140 || gfc_wide_strlen (dt->asynchronous->value.character.string) != 3
3141 || gfc_wide_strncasecmp (dt->asynchronous->value.character.string,
3142 "yes", 3) != 0;
3143 io_constraint (not_yes,
3144 "ID= specifier at %L must be with ASYNCHRONOUS='yes' "
3145 "specifier", &dt->id->where);
3146 }
3147
3148 if (dt->decimal)
3149 {
3150 if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: DECIMAL= at %C "
3151 "not allowed in Fortran 95") == FAILURE)
3152 return MATCH_ERROR;
3153
3154 if (dt->decimal->expr_type == EXPR_CONSTANT)
3155 {
3156 static const char * decimal[] = { "COMMA", "POINT", NULL };
3157
3158 if (!compare_to_allowed_values ("DECIMAL", decimal, NULL, NULL,
3159 dt->decimal->value.character.string,
3160 io_kind_name (k), warn))
3161 return MATCH_ERROR;
3162
3163 io_constraint (unformatted,
3164 "the DECIMAL= specifier at %L must be with an "
3165 "explicit format expression", &dt->decimal->where);
3166 }
3167 }
3168
3169 if (dt->blank)
3170 {
3171 if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: BLANK= at %C "
3172 "not allowed in Fortran 95") == FAILURE)
3173 return MATCH_ERROR;
3174
3175 if (dt->blank->expr_type == EXPR_CONSTANT)
3176 {
3177 static const char * blank[] = { "NULL", "ZERO", NULL };
3178
3179 if (!compare_to_allowed_values ("BLANK", blank, NULL, NULL,
3180 dt->blank->value.character.string,
3181 io_kind_name (k), warn))
3182 return MATCH_ERROR;
3183
3184 io_constraint (unformatted,
3185 "the BLANK= specifier at %L must be with an "
3186 "explicit format expression", &dt->blank->where);
3187 }
3188 }
3189
3190 if (dt->pad)
3191 {
3192 if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: PAD= at %C "
3193 "not allowed in Fortran 95") == FAILURE)
3194 return MATCH_ERROR;
3195
3196 if (dt->pad->expr_type == EXPR_CONSTANT)
3197 {
3198 static const char * pad[] = { "YES", "NO", NULL };
3199
3200 if (!compare_to_allowed_values ("PAD", pad, NULL, NULL,
3201 dt->pad->value.character.string,
3202 io_kind_name (k), warn))
3203 return MATCH_ERROR;
3204
3205 io_constraint (unformatted,
3206 "the PAD= specifier at %L must be with an "
3207 "explicit format expression", &dt->pad->where);
3208 }
3209 }
3210
3211 if (dt->round)
3212 {
3213 /* When implemented, change the following to use gfc_notify_std F2003.
3214 if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: ROUND= at %C "
3215 "not allowed in Fortran 95") == FAILURE)
3216 return MATCH_ERROR; */
3217 gfc_error ("F2003 Feature: ROUND= specifier at %C not implemented");
3218 return MATCH_ERROR;
3219
3220 if (dt->round->expr_type == EXPR_CONSTANT)
3221 {
3222 static const char * round[] = { "UP", "DOWN", "ZERO", "NEAREST",
3223 "COMPATIBLE", "PROCESSOR_DEFINED",
3224 NULL };
3225
3226 if (!compare_to_allowed_values ("ROUND", round, NULL, NULL,
3227 dt->round->value.character.string,
3228 io_kind_name (k), warn))
3229 return MATCH_ERROR;
3230 }
3231 }
3232
3233 if (dt->sign)
3234 {
3235 /* When implemented, change the following to use gfc_notify_std F2003.
3236 if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: SIGN= at %C "
3237 "not allowed in Fortran 95") == FAILURE)
3238 return MATCH_ERROR; */
3239 if (dt->sign->expr_type == EXPR_CONSTANT)
3240 {
3241 static const char * sign[] = { "PLUS", "SUPPRESS", "PROCESSOR_DEFINED",
3242 NULL };
3243
3244 if (!compare_to_allowed_values ("SIGN", sign, NULL, NULL,
3245 dt->sign->value.character.string,
3246 io_kind_name (k), warn))
3247 return MATCH_ERROR;
3248
3249 io_constraint (unformatted,
3250 "SIGN= specifier at %L must be with an "
3251 "explicit format expression", &dt->sign->where);
3252
3253 io_constraint (k == M_READ,
3254 "SIGN= specifier at %L not allowed in a "
3255 "READ statement", &dt->sign->where);
3256 }
3257 }
3258
3259 if (dt->delim)
3260 {
3261 if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: DELIM= at %C "
3262 "not allowed in Fortran 95") == FAILURE)
3263 return MATCH_ERROR;
3264
3265 if (dt->delim->expr_type == EXPR_CONSTANT)
3266 {
3267 static const char *delim[] = { "APOSTROPHE", "QUOTE", "NONE", NULL };
3268
3269 if (!compare_to_allowed_values ("DELIM", delim, NULL, NULL,
3270 dt->delim->value.character.string,
3271 io_kind_name (k), warn))
3272 return MATCH_ERROR;
3273
3274 io_constraint (k == M_READ,
3275 "DELIM= specifier at %L not allowed in a "
3276 "READ statement", &dt->delim->where);
3277
3278 io_constraint (dt->format_label != &format_asterisk
3279 && dt->namelist == NULL,
3280 "DELIM= specifier at %L must have FMT=*",
3281 &dt->delim->where);
3282
3283 io_constraint (unformatted && dt->namelist == NULL,
3284 "DELIM= specifier at %L must be with FMT=* or "
3285 "NML= specifier ", &dt->delim->where);
3286 }
3287 }
3288
3289 if (dt->namelist)
3290 {
3291 io_constraint (io_code && dt->namelist,
3292 "NAMELIST cannot be followed by IO-list at %L",
3293 &io_code->loc);
3294
3295 io_constraint (dt->format_expr,
3296 "IO spec-list cannot contain both NAMELIST group name "
3297 "and format specification at %L",
3298 &dt->format_expr->where);
3299
3300 io_constraint (dt->format_label,
3301 "IO spec-list cannot contain both NAMELIST group name "
3302 "and format label at %L", spec_end);
3303
3304 io_constraint (dt->rec,
3305 "NAMELIST IO is not allowed with a REC= specifier "
3306 "at %L", &dt->rec->where);
3307
3308 io_constraint (dt->advance,
3309 "NAMELIST IO is not allowed with a ADVANCE= specifier "
3310 "at %L", &dt->advance->where);
3311 }
3312
3313 if (dt->rec)
3314 {
3315 io_constraint (dt->end,
3316 "An END tag is not allowed with a "
3317 "REC= specifier at %L", &dt->end_where);
3318
3319 io_constraint (dt->format_label == &format_asterisk,
3320 "FMT=* is not allowed with a REC= specifier "
3321 "at %L", spec_end);
3322
3323 io_constraint (dt->pos,
3324 "POS= is not allowed with REC= specifier "
3325 "at %L", &dt->pos->where);
3326 }
3327
3328 if (dt->advance)
3329 {
3330 int not_yes, not_no;
3331 expr = dt->advance;
3332
3333 io_constraint (dt->format_label == &format_asterisk,
3334 "List directed format(*) is not allowed with a "
3335 "ADVANCE= specifier at %L.", &expr->where);
3336
3337 io_constraint (unformatted,
3338 "the ADVANCE= specifier at %L must appear with an "
3339 "explicit format expression", &expr->where);
3340
3341 if (expr->expr_type == EXPR_CONSTANT && expr->ts.type == BT_CHARACTER)
3342 {
3343 const gfc_char_t *advance = expr->value.character.string;
3344 not_no = gfc_wide_strlen (advance) != 2
3345 || gfc_wide_strncasecmp (advance, "no", 2) != 0;
3346 not_yes = gfc_wide_strlen (advance) != 3
3347 || gfc_wide_strncasecmp (advance, "yes", 3) != 0;
3348 }
3349 else
3350 {
3351 not_no = 0;
3352 not_yes = 0;
3353 }
3354
3355 io_constraint (not_no && not_yes,
3356 "ADVANCE= specifier at %L must have value = "
3357 "YES or NO.", &expr->where);
3358
3359 io_constraint (dt->size && not_no && k == M_READ,
3360 "SIZE tag at %L requires an ADVANCE = 'NO'",
3361 &dt->size->where);
3362
3363 io_constraint (dt->eor && not_no && k == M_READ,
3364 "EOR tag at %L requires an ADVANCE = 'NO'",
3365 &dt->eor_where);
3366 }
3367
3368 expr = dt->format_expr;
3369 if (gfc_simplify_expr (expr, 0) == FAILURE
3370 || check_format_string (expr, k == M_READ) == FAILURE)
3371 return MATCH_ERROR;
3372
3373 return m;
3374 }
3375 #undef io_constraint
3376
3377
3378 /* Match a READ, WRITE or PRINT statement. */
3379
3380 static match
3381 match_io (io_kind k)
3382 {
3383 char name[GFC_MAX_SYMBOL_LEN + 1];
3384 gfc_code *io_code;
3385 gfc_symbol *sym;
3386 int comma_flag;
3387 locus where;
3388 locus spec_end;
3389 gfc_dt *dt;
3390 match m;
3391
3392 where = gfc_current_locus;
3393 comma_flag = 0;
3394 current_dt = dt = XCNEW (gfc_dt);
3395 m = gfc_match_char ('(');
3396 if (m == MATCH_NO)
3397 {
3398 where = gfc_current_locus;
3399 if (k == M_WRITE)
3400 goto syntax;
3401 else if (k == M_PRINT)
3402 {
3403 /* Treat the non-standard case of PRINT namelist. */
3404 if ((gfc_current_form == FORM_FIXED || gfc_peek_ascii_char () == ' ')
3405 && gfc_match_name (name) == MATCH_YES)
3406 {
3407 gfc_find_symbol (name, NULL, 1, &sym);
3408 if (sym && sym->attr.flavor == FL_NAMELIST)
3409 {
3410 if (gfc_notify_std (GFC_STD_GNU, "PRINT namelist at "
3411 "%C is an extension") == FAILURE)
3412 {
3413 m = MATCH_ERROR;
3414 goto cleanup;
3415 }
3416
3417 dt->io_unit = default_unit (k);
3418 dt->namelist = sym;
3419 goto get_io_list;
3420 }
3421 else
3422 gfc_current_locus = where;
3423 }
3424 }
3425
3426 if (gfc_current_form == FORM_FREE)
3427 {
3428 char c = gfc_peek_ascii_char ();
3429 if (c != ' ' && c != '*' && c != '\'' && c != '"')
3430 {
3431 m = MATCH_NO;
3432 goto cleanup;
3433 }
3434 }
3435
3436 m = match_dt_format (dt);
3437 if (m == MATCH_ERROR)
3438 goto cleanup;
3439 if (m == MATCH_NO)
3440 goto syntax;
3441
3442 comma_flag = 1;
3443 dt->io_unit = default_unit (k);
3444 goto get_io_list;
3445 }
3446 else
3447 {
3448 /* Before issuing an error for a malformed 'print (1,*)' type of
3449 error, check for a default-char-expr of the form ('(I0)'). */
3450 if (k == M_PRINT && m == MATCH_YES)
3451 {
3452 /* Reset current locus to get the initial '(' in an expression. */
3453 gfc_current_locus = where;
3454 dt->format_expr = NULL;
3455 m = match_dt_format (dt);
3456
3457 if (m == MATCH_ERROR)
3458 goto cleanup;
3459 if (m == MATCH_NO || dt->format_expr == NULL)
3460 goto syntax;
3461
3462 comma_flag = 1;
3463 dt->io_unit = default_unit (k);
3464 goto get_io_list;
3465 }
3466 }
3467
3468 /* Match a control list */
3469 if (match_dt_element (k, dt) == MATCH_YES)
3470 goto next;
3471 if (match_dt_unit (k, dt) != MATCH_YES)
3472 goto loop;
3473
3474 if (gfc_match_char (')') == MATCH_YES)
3475 goto get_io_list;
3476 if (gfc_match_char (',') != MATCH_YES)
3477 goto syntax;
3478
3479 m = match_dt_element (k, dt);
3480 if (m == MATCH_YES)
3481 goto next;
3482 if (m == MATCH_ERROR)
3483 goto cleanup;
3484
3485 m = match_dt_format (dt);
3486 if (m == MATCH_YES)
3487 goto next;
3488 if (m == MATCH_ERROR)
3489 goto cleanup;
3490
3491 where = gfc_current_locus;
3492
3493 m = gfc_match_name (name);
3494 if (m == MATCH_YES)
3495 {
3496 gfc_find_symbol (name, NULL, 1, &sym);
3497 if (sym && sym->attr.flavor == FL_NAMELIST)
3498 {
3499 dt->namelist = sym;
3500 if (k == M_READ && check_namelist (sym))
3501 {
3502 m = MATCH_ERROR;
3503 goto cleanup;
3504 }
3505 goto next;
3506 }
3507 }
3508
3509 gfc_current_locus = where;
3510
3511 goto loop; /* No matches, try regular elements */
3512
3513 next:
3514 if (gfc_match_char (')') == MATCH_YES)
3515 goto get_io_list;
3516 if (gfc_match_char (',') != MATCH_YES)
3517 goto syntax;
3518
3519 loop:
3520 for (;;)
3521 {
3522 m = match_dt_element (k, dt);
3523 if (m == MATCH_NO)
3524 goto syntax;
3525 if (m == MATCH_ERROR)
3526 goto cleanup;
3527
3528 if (gfc_match_char (')') == MATCH_YES)
3529 break;
3530 if (gfc_match_char (',') != MATCH_YES)
3531 goto syntax;
3532 }
3533
3534 get_io_list:
3535
3536 /* Used in check_io_constraints, where no locus is available. */
3537 spec_end = gfc_current_locus;
3538
3539 /* Optional leading comma (non-standard). We use a gfc_expr structure here
3540 to save the locus. This is used later when resolving transfer statements
3541 that might have a format expression without unit number. */
3542 if (!comma_flag && gfc_match_char (',') == MATCH_YES)
3543 {
3544 dt->extra_comma = gfc_get_expr ();
3545
3546 /* Set the types to something compatible with iokind. This is needed to
3547 get through gfc_free_expr later since iokind really has no Basic Type,
3548 BT, of its own. */
3549 dt->extra_comma->expr_type = EXPR_CONSTANT;
3550 dt->extra_comma->ts.type = BT_LOGICAL;
3551
3552 /* Save the iokind and locus for later use in resolution. */
3553 dt->extra_comma->value.iokind = k;
3554 dt->extra_comma->where = gfc_current_locus;
3555 }
3556
3557 io_code = NULL;
3558 if (gfc_match_eos () != MATCH_YES)
3559 {
3560 if (comma_flag && gfc_match_char (',') != MATCH_YES)
3561 {
3562 gfc_error ("Expected comma in I/O list at %C");
3563 m = MATCH_ERROR;
3564 goto cleanup;
3565 }
3566
3567 m = match_io_list (k, &io_code);
3568 if (m == MATCH_ERROR)
3569 goto cleanup;
3570 if (m == MATCH_NO)
3571 goto syntax;
3572 }
3573
3574 /* A full IO statement has been matched. Check the constraints. spec_end is
3575 supplied for cases where no locus is supplied. */
3576 m = check_io_constraints (k, dt, io_code, &spec_end);
3577
3578 if (m == MATCH_ERROR)
3579 goto cleanup;
3580
3581 new_st.op = (k == M_READ) ? EXEC_READ : EXEC_WRITE;
3582 new_st.ext.dt = dt;
3583 new_st.block = gfc_get_code ();
3584 new_st.block->op = new_st.op;
3585 new_st.block->next = io_code;
3586
3587 terminate_io (io_code);
3588
3589 return MATCH_YES;
3590
3591 syntax:
3592 gfc_error ("Syntax error in %s statement at %C", io_kind_name (k));
3593 m = MATCH_ERROR;
3594
3595 cleanup:
3596 gfc_free_dt (dt);
3597 return m;
3598 }
3599
3600
3601 match
3602 gfc_match_read (void)
3603 {
3604 return match_io (M_READ);
3605 }
3606
3607
3608 match
3609 gfc_match_write (void)
3610 {
3611 return match_io (M_WRITE);
3612 }
3613
3614
3615 match
3616 gfc_match_print (void)
3617 {
3618 match m;
3619
3620 m = match_io (M_PRINT);
3621 if (m != MATCH_YES)
3622 return m;
3623
3624 if (gfc_pure (NULL))
3625 {
3626 gfc_error ("PRINT statement at %C not allowed within PURE procedure");
3627 return MATCH_ERROR;
3628 }
3629
3630 return MATCH_YES;
3631 }
3632
3633
3634 /* Free a gfc_inquire structure. */
3635
3636 void
3637 gfc_free_inquire (gfc_inquire *inquire)
3638 {
3639
3640 if (inquire == NULL)
3641 return;
3642
3643 gfc_free_expr (inquire->unit);
3644 gfc_free_expr (inquire->file);
3645 gfc_free_expr (inquire->iomsg);
3646 gfc_free_expr (inquire->iostat);
3647 gfc_free_expr (inquire->exist);
3648 gfc_free_expr (inquire->opened);
3649 gfc_free_expr (inquire->number);
3650 gfc_free_expr (inquire->named);
3651 gfc_free_expr (inquire->name);
3652 gfc_free_expr (inquire->access);
3653 gfc_free_expr (inquire->sequential);
3654 gfc_free_expr (inquire->direct);
3655 gfc_free_expr (inquire->form);
3656 gfc_free_expr (inquire->formatted);
3657 gfc_free_expr (inquire->unformatted);
3658 gfc_free_expr (inquire->recl);
3659 gfc_free_expr (inquire->nextrec);
3660 gfc_free_expr (inquire->blank);
3661 gfc_free_expr (inquire->position);
3662 gfc_free_expr (inquire->action);
3663 gfc_free_expr (inquire->read);
3664 gfc_free_expr (inquire->write);
3665 gfc_free_expr (inquire->readwrite);
3666 gfc_free_expr (inquire->delim);
3667 gfc_free_expr (inquire->encoding);
3668 gfc_free_expr (inquire->pad);
3669 gfc_free_expr (inquire->iolength);
3670 gfc_free_expr (inquire->convert);
3671 gfc_free_expr (inquire->strm_pos);
3672 gfc_free_expr (inquire->asynchronous);
3673 gfc_free_expr (inquire->decimal);
3674 gfc_free_expr (inquire->pending);
3675 gfc_free_expr (inquire->id);
3676 gfc_free_expr (inquire->sign);
3677 gfc_free_expr (inquire->size);
3678 gfc_free_expr (inquire->round);
3679 gfc_free (inquire);
3680 }
3681
3682
3683 /* Match an element of an INQUIRE statement. */
3684
3685 #define RETM if (m != MATCH_NO) return m;
3686
3687 static match
3688 match_inquire_element (gfc_inquire *inquire)
3689 {
3690 match m;
3691
3692 m = match_etag (&tag_unit, &inquire->unit);
3693 RETM m = match_etag (&tag_file, &inquire->file);
3694 RETM m = match_ltag (&tag_err, &inquire->err);
3695 RETM m = match_out_tag (&tag_iomsg, &inquire->iomsg);
3696 RETM m = match_out_tag (&tag_iostat, &inquire->iostat);
3697 RETM m = match_vtag (&tag_exist, &inquire->exist);
3698 RETM m = match_vtag (&tag_opened, &inquire->opened);
3699 RETM m = match_vtag (&tag_named, &inquire->named);
3700 RETM m = match_vtag (&tag_name, &inquire->name);
3701 RETM m = match_out_tag (&tag_number, &inquire->number);
3702 RETM m = match_vtag (&tag_s_access, &inquire->access);
3703 RETM m = match_vtag (&tag_sequential, &inquire->sequential);
3704 RETM m = match_vtag (&tag_direct, &inquire->direct);
3705 RETM m = match_vtag (&tag_s_form, &inquire->form);
3706 RETM m = match_vtag (&tag_formatted, &inquire->formatted);
3707 RETM m = match_vtag (&tag_unformatted, &inquire->unformatted);
3708 RETM m = match_out_tag (&tag_s_recl, &inquire->recl);
3709 RETM m = match_out_tag (&tag_nextrec, &inquire->nextrec);
3710 RETM m = match_vtag (&tag_s_blank, &inquire->blank);
3711 RETM m = match_vtag (&tag_s_position, &inquire->position);
3712 RETM m = match_vtag (&tag_s_action, &inquire->action);
3713 RETM m = match_vtag (&tag_read, &inquire->read);
3714 RETM m = match_vtag (&tag_write, &inquire->write);
3715 RETM m = match_vtag (&tag_readwrite, &inquire->readwrite);
3716 RETM m = match_vtag (&tag_s_async, &inquire->asynchronous);
3717 RETM m = match_vtag (&tag_s_delim, &inquire->delim);
3718 RETM m = match_vtag (&tag_s_decimal, &inquire->decimal);
3719 RETM m = match_vtag (&tag_size, &inquire->size);
3720 RETM m = match_vtag (&tag_s_encoding, &inquire->encoding);
3721 RETM m = match_vtag (&tag_s_round, &inquire->round);
3722 RETM m = match_vtag (&tag_s_sign, &inquire->sign);
3723 RETM m = match_vtag (&tag_s_pad, &inquire->pad);
3724 RETM m = match_vtag (&tag_iolength, &inquire->iolength);
3725 RETM m = match_vtag (&tag_convert, &inquire->convert);
3726 RETM m = match_out_tag (&tag_strm_out, &inquire->strm_pos);
3727 RETM m = match_vtag (&tag_pending, &inquire->pending);
3728 RETM m = match_vtag (&tag_id, &inquire->id);
3729 RETM return MATCH_NO;
3730 }
3731
3732 #undef RETM
3733
3734
3735 match
3736 gfc_match_inquire (void)
3737 {
3738 gfc_inquire *inquire;
3739 gfc_code *code;
3740 match m;
3741 locus loc;
3742
3743 m = gfc_match_char ('(');
3744 if (m == MATCH_NO)
3745 return m;
3746
3747 inquire = XCNEW (gfc_inquire);
3748
3749 loc = gfc_current_locus;
3750
3751 m = match_inquire_element (inquire);
3752 if (m == MATCH_ERROR)
3753 goto cleanup;
3754 if (m == MATCH_NO)
3755 {
3756 m = gfc_match_expr (&inquire->unit);
3757 if (m == MATCH_ERROR)
3758 goto cleanup;
3759 if (m == MATCH_NO)
3760 goto syntax;
3761 }
3762
3763 /* See if we have the IOLENGTH form of the inquire statement. */
3764 if (inquire->iolength != NULL)
3765 {
3766 if (gfc_match_char (')') != MATCH_YES)
3767 goto syntax;
3768
3769 m = match_io_list (M_INQUIRE, &code);
3770 if (m == MATCH_ERROR)
3771 goto cleanup;
3772 if (m == MATCH_NO)
3773 goto syntax;
3774
3775 new_st.op = EXEC_IOLENGTH;
3776 new_st.expr1 = inquire->iolength;
3777 new_st.ext.inquire = inquire;
3778
3779 if (gfc_pure (NULL))
3780 {
3781 gfc_free_statements (code);
3782 gfc_error ("INQUIRE statement not allowed in PURE procedure at %C");
3783 return MATCH_ERROR;
3784 }
3785
3786 new_st.block = gfc_get_code ();
3787 new_st.block->op = EXEC_IOLENGTH;
3788 terminate_io (code);
3789 new_st.block->next = code;
3790 return MATCH_YES;
3791 }
3792
3793 /* At this point, we have the non-IOLENGTH inquire statement. */
3794 for (;;)
3795 {
3796 if (gfc_match_char (')') == MATCH_YES)
3797 break;
3798 if (gfc_match_char (',') != MATCH_YES)
3799 goto syntax;
3800
3801 m = match_inquire_element (inquire);
3802 if (m == MATCH_ERROR)
3803 goto cleanup;
3804 if (m == MATCH_NO)
3805 goto syntax;
3806
3807 if (inquire->iolength != NULL)
3808 {
3809 gfc_error ("IOLENGTH tag invalid in INQUIRE statement at %C");
3810 goto cleanup;
3811 }
3812 }
3813
3814 if (gfc_match_eos () != MATCH_YES)
3815 goto syntax;
3816
3817 if (inquire->unit != NULL && inquire->file != NULL)
3818 {
3819 gfc_error ("INQUIRE statement at %L cannot contain both FILE and "
3820 "UNIT specifiers", &loc);
3821 goto cleanup;
3822 }
3823
3824 if (inquire->unit == NULL && inquire->file == NULL)
3825 {
3826 gfc_error ("INQUIRE statement at %L requires either FILE or "
3827 "UNIT specifier", &loc);
3828 goto cleanup;
3829 }
3830
3831 if (gfc_pure (NULL))
3832 {
3833 gfc_error ("INQUIRE statement not allowed in PURE procedure at %C");
3834 goto cleanup;
3835 }
3836
3837 if (inquire->id != NULL && inquire->pending == NULL)
3838 {
3839 gfc_error ("INQUIRE statement at %L requires a PENDING= specifier with "
3840 "the ID= specifier", &loc);
3841 goto cleanup;
3842 }
3843
3844 new_st.op = EXEC_INQUIRE;
3845 new_st.ext.inquire = inquire;
3846 return MATCH_YES;
3847
3848 syntax:
3849 gfc_syntax_error (ST_INQUIRE);
3850
3851 cleanup:
3852 gfc_free_inquire (inquire);
3853 return MATCH_ERROR;
3854 }
3855
3856
3857 /* Resolve everything in a gfc_inquire structure. */
3858
3859 gfc_try
3860 gfc_resolve_inquire (gfc_inquire *inquire)
3861 {
3862 RESOLVE_TAG (&tag_unit, inquire->unit);
3863 RESOLVE_TAG (&tag_file, inquire->file);
3864 RESOLVE_TAG (&tag_iomsg, inquire->iomsg);
3865 RESOLVE_TAG (&tag_iostat, inquire->iostat);
3866 RESOLVE_TAG (&tag_exist, inquire->exist);
3867 RESOLVE_TAG (&tag_opened, inquire->opened);
3868 RESOLVE_TAG (&tag_number, inquire->number);
3869 RESOLVE_TAG (&tag_named, inquire->named);
3870 RESOLVE_TAG (&tag_name, inquire->name);
3871 RESOLVE_TAG (&tag_s_access, inquire->access);
3872 RESOLVE_TAG (&tag_sequential, inquire->sequential);
3873 RESOLVE_TAG (&tag_direct, inquire->direct);
3874 RESOLVE_TAG (&tag_s_form, inquire->form);
3875 RESOLVE_TAG (&tag_formatted, inquire->formatted);
3876 RESOLVE_TAG (&tag_unformatted, inquire->unformatted);
3877 RESOLVE_TAG (&tag_s_recl, inquire->recl);
3878 RESOLVE_TAG (&tag_nextrec, inquire->nextrec);
3879 RESOLVE_TAG (&tag_s_blank, inquire->blank);
3880 RESOLVE_TAG (&tag_s_position, inquire->position);
3881 RESOLVE_TAG (&tag_s_action, inquire->action);
3882 RESOLVE_TAG (&tag_read, inquire->read);
3883 RESOLVE_TAG (&tag_write, inquire->write);
3884 RESOLVE_TAG (&tag_readwrite, inquire->readwrite);
3885 RESOLVE_TAG (&tag_s_delim, inquire->delim);
3886 RESOLVE_TAG (&tag_s_pad, inquire->pad);
3887 RESOLVE_TAG (&tag_s_encoding, inquire->encoding);
3888 RESOLVE_TAG (&tag_s_round, inquire->round);
3889 RESOLVE_TAG (&tag_iolength, inquire->iolength);
3890 RESOLVE_TAG (&tag_convert, inquire->convert);
3891 RESOLVE_TAG (&tag_strm_out, inquire->strm_pos);
3892 RESOLVE_TAG (&tag_s_async, inquire->asynchronous);
3893 RESOLVE_TAG (&tag_s_sign, inquire->sign);
3894 RESOLVE_TAG (&tag_s_round, inquire->round);
3895 RESOLVE_TAG (&tag_pending, inquire->pending);
3896 RESOLVE_TAG (&tag_size, inquire->size);
3897 RESOLVE_TAG (&tag_id, inquire->id);
3898
3899 if (gfc_reference_st_label (inquire->err, ST_LABEL_TARGET) == FAILURE)
3900 return FAILURE;
3901
3902 return SUCCESS;
3903 }
3904
3905
3906 void
3907 gfc_free_wait (gfc_wait *wait)
3908 {
3909 if (wait == NULL)
3910 return;
3911
3912 gfc_free_expr (wait->unit);
3913 gfc_free_expr (wait->iostat);
3914 gfc_free_expr (wait->iomsg);
3915 gfc_free_expr (wait->id);
3916 }
3917
3918
3919 gfc_try
3920 gfc_resolve_wait (gfc_wait *wait)
3921 {
3922 RESOLVE_TAG (&tag_unit, wait->unit);
3923 RESOLVE_TAG (&tag_iomsg, wait->iomsg);
3924 RESOLVE_TAG (&tag_iostat, wait->iostat);
3925 RESOLVE_TAG (&tag_id, wait->id);
3926
3927 if (gfc_reference_st_label (wait->err, ST_LABEL_TARGET) == FAILURE)
3928 return FAILURE;
3929
3930 if (gfc_reference_st_label (wait->end, ST_LABEL_TARGET) == FAILURE)
3931 return FAILURE;
3932
3933 return SUCCESS;
3934 }
3935
3936 /* Match an element of a WAIT statement. */
3937
3938 #define RETM if (m != MATCH_NO) return m;
3939
3940 static match
3941 match_wait_element (gfc_wait *wait)
3942 {
3943 match m;
3944
3945 m = match_etag (&tag_unit, &wait->unit);
3946 RETM m = match_ltag (&tag_err, &wait->err);
3947 RETM m = match_ltag (&tag_end, &wait->eor);
3948 RETM m = match_ltag (&tag_eor, &wait->end);
3949 RETM m = match_out_tag (&tag_iomsg, &wait->iomsg);
3950 RETM m = match_out_tag (&tag_iostat, &wait->iostat);
3951 RETM m = match_etag (&tag_id, &wait->id);
3952 RETM return MATCH_NO;
3953 }
3954
3955 #undef RETM
3956
3957
3958 match
3959 gfc_match_wait (void)
3960 {
3961 gfc_wait *wait;
3962 match m;
3963 locus loc;
3964
3965 m = gfc_match_char ('(');
3966 if (m == MATCH_NO)
3967 return m;
3968
3969 wait = XCNEW (gfc_wait);
3970
3971 loc = gfc_current_locus;
3972
3973 m = match_wait_element (wait);
3974 if (m == MATCH_ERROR)
3975 goto cleanup;
3976 if (m == MATCH_NO)
3977 {
3978 m = gfc_match_expr (&wait->unit);
3979 if (m == MATCH_ERROR)
3980 goto cleanup;
3981 if (m == MATCH_NO)
3982 goto syntax;
3983 }
3984
3985 for (;;)
3986 {
3987 if (gfc_match_char (')') == MATCH_YES)
3988 break;
3989 if (gfc_match_char (',') != MATCH_YES)
3990 goto syntax;
3991
3992 m = match_wait_element (wait);
3993 if (m == MATCH_ERROR)
3994 goto cleanup;
3995 if (m == MATCH_NO)
3996 goto syntax;
3997 }
3998
3999 if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: WAIT at %C "
4000 "not allowed in Fortran 95") == FAILURE)
4001 goto cleanup;
4002
4003 if (gfc_pure (NULL))
4004 {
4005 gfc_error ("WAIT statement not allowed in PURE procedure at %C");
4006 goto cleanup;
4007 }
4008
4009 new_st.op = EXEC_WAIT;
4010 new_st.ext.wait = wait;
4011
4012 return MATCH_YES;
4013
4014 syntax:
4015 gfc_syntax_error (ST_WAIT);
4016
4017 cleanup:
4018 gfc_free_wait (wait);
4019 return MATCH_ERROR;
4020 }