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PR rtl-optimization/43520
[official-gcc.git] / gcc / fortran / io.c
blob6766f3d8a23b615e278d7c7b4f4e6faaf0d91de3
1 /* Deal with I/O statements & related stuff.
2 Copyright (C) 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008,
3 2009, 2010
4 Free Software Foundation, Inc.
5 Contributed by Andy Vaught
6
7 This file is part of GCC.
8
9 GCC is free software; you can redistribute it and/or modify it under
10 the terms of the GNU General Public License as published by the Free
11 Software Foundation; either version 3, or (at your option) any later
12 version.
13
14 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
15 WARRANTY; without even the implied warranty of MERCHANTABILITY or
16 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
17 for more details.
18
19 You should have received a copy of the GNU General Public License
20 along with GCC; see the file COPYING3. If not see
21 <http://www.gnu.org/licenses/>. */
22
23 #include "config.h"
24 #include "system.h"
25 #include "flags.h"
26 #include "gfortran.h"
27 #include "match.h"
28 #include "parse.h"
29
30 gfc_st_label
31 format_asterisk = {0, NULL, NULL, -1, ST_LABEL_FORMAT, ST_LABEL_FORMAT, NULL,
32 0, {NULL, NULL}};
33
34 typedef struct
35 {
36 const char *name, *spec, *value;
37 bt type;
38 }
39 io_tag;
40
41 static const io_tag
42 tag_file = {"FILE", " file =", " %e", BT_CHARACTER },
43 tag_status = {"STATUS", " status =", " %e", BT_CHARACTER},
44 tag_e_access = {"ACCESS", " access =", " %e", BT_CHARACTER},
45 tag_e_form = {"FORM", " form =", " %e", BT_CHARACTER},
46 tag_e_recl = {"RECL", " recl =", " %e", BT_INTEGER},
47 tag_e_blank = {"BLANK", " blank =", " %e", BT_CHARACTER},
48 tag_e_position = {"POSITION", " position =", " %e", BT_CHARACTER},
49 tag_e_action = {"ACTION", " action =", " %e", BT_CHARACTER},
50 tag_e_delim = {"DELIM", " delim =", " %e", BT_CHARACTER},
51 tag_e_pad = {"PAD", " pad =", " %e", BT_CHARACTER},
52 tag_e_decimal = {"DECIMAL", " decimal =", " %e", BT_CHARACTER},
53 tag_e_encoding = {"ENCODING", " encoding =", " %e", BT_CHARACTER},
54 tag_e_async = {"ASYNCHRONOUS", " asynchronous =", " %e", BT_CHARACTER},
55 tag_e_round = {"ROUND", " round =", " %e", BT_CHARACTER},
56 tag_e_sign = {"SIGN", " sign =", " %e", BT_CHARACTER},
57 tag_unit = {"UNIT", " unit =", " %e", BT_INTEGER},
58 tag_advance = {"ADVANCE", " advance =", " %e", BT_CHARACTER},
59 tag_rec = {"REC", " rec =", " %e", BT_INTEGER},
60 tag_spos = {"POSITION", " pos =", " %e", BT_INTEGER},
61 tag_format = {"FORMAT", NULL, NULL, BT_CHARACTER},
62 tag_iomsg = {"IOMSG", " iomsg =", " %e", BT_CHARACTER},
63 tag_iostat = {"IOSTAT", " iostat =", " %v", BT_INTEGER},
64 tag_size = {"SIZE", " size =", " %v", BT_INTEGER},
65 tag_exist = {"EXIST", " exist =", " %v", BT_LOGICAL},
66 tag_opened = {"OPENED", " opened =", " %v", BT_LOGICAL},
67 tag_named = {"NAMED", " named =", " %v", BT_LOGICAL},
68 tag_name = {"NAME", " name =", " %v", BT_CHARACTER},
69 tag_number = {"NUMBER", " number =", " %v", BT_INTEGER},
70 tag_s_access = {"ACCESS", " access =", " %v", BT_CHARACTER},
71 tag_sequential = {"SEQUENTIAL", " sequential =", " %v", BT_CHARACTER},
72 tag_direct = {"DIRECT", " direct =", " %v", BT_CHARACTER},
73 tag_s_form = {"FORM", " form =", " %v", BT_CHARACTER},
74 tag_formatted = {"FORMATTED", " formatted =", " %v", BT_CHARACTER},
75 tag_unformatted = {"UNFORMATTED", " unformatted =", " %v", BT_CHARACTER},
76 tag_s_recl = {"RECL", " recl =", " %v", BT_INTEGER},
77 tag_nextrec = {"NEXTREC", " nextrec =", " %v", BT_INTEGER},
78 tag_s_blank = {"BLANK", " blank =", " %v", BT_CHARACTER},
79 tag_s_position = {"POSITION", " position =", " %v", BT_CHARACTER},
80 tag_s_action = {"ACTION", " action =", " %v", BT_CHARACTER},
81 tag_read = {"READ", " read =", " %v", BT_CHARACTER},
82 tag_write = {"WRITE", " write =", " %v", BT_CHARACTER},
83 tag_readwrite = {"READWRITE", " readwrite =", " %v", BT_CHARACTER},
84 tag_s_delim = {"DELIM", " delim =", " %v", BT_CHARACTER},
85 tag_s_pad = {"PAD", " pad =", " %v", BT_CHARACTER},
86 tag_s_decimal = {"DECIMAL", " decimal =", " %v", BT_CHARACTER},
87 tag_s_encoding = {"ENCODING", " encoding =", " %v", BT_CHARACTER},
88 tag_s_async = {"ASYNCHRONOUS", " asynchronous =", " %v", BT_CHARACTER},
89 tag_s_round = {"ROUND", " round =", " %v", BT_CHARACTER},
90 tag_s_sign = {"SIGN", " sign =", " %v", BT_CHARACTER},
91 tag_iolength = {"IOLENGTH", " iolength =", " %v", BT_INTEGER},
92 tag_convert = {"CONVERT", " convert =", " %e", BT_CHARACTER},
93 tag_strm_out = {"POS", " pos =", " %v", BT_INTEGER},
94 tag_err = {"ERR", " err =", " %l", BT_UNKNOWN},
95 tag_end = {"END", " end =", " %l", BT_UNKNOWN},
96 tag_eor = {"EOR", " eor =", " %l", BT_UNKNOWN},
97 tag_id = {"ID", " id =", " %v", BT_INTEGER},
98 tag_pending = {"PENDING", " pending =", " %v", BT_LOGICAL},
99 tag_newunit = {"NEWUNIT", " newunit =", " %v", BT_INTEGER};
100
101 static gfc_dt *current_dt;
102
103 #define RESOLVE_TAG(x, y) if (resolve_tag(x, y) == FAILURE) return FAILURE;
104
105
106 /**************** Fortran 95 FORMAT parser *****************/
107
108 /* FORMAT tokens returned by format_lex(). */
109 typedef enum
110 {
111 FMT_NONE, FMT_UNKNOWN, FMT_SIGNED_INT, FMT_ZERO, FMT_POSINT, FMT_PERIOD,
112 FMT_COMMA, FMT_COLON, FMT_SLASH, FMT_DOLLAR, FMT_LPAREN,
113 FMT_RPAREN, FMT_X, FMT_SIGN, FMT_BLANK, FMT_CHAR, FMT_P, FMT_IBOZ, FMT_F,
114 FMT_E, FMT_EN, FMT_ES, FMT_G, FMT_L, FMT_A, FMT_D, FMT_H, FMT_END,
115 FMT_ERROR, FMT_DC, FMT_DP, FMT_T, FMT_TR, FMT_TL, FMT_STAR, FMT_RC,
116 FMT_RD, FMT_RN, FMT_RP, FMT_RU, FMT_RZ
117 }
118 format_token;
119
120 /* Local variables for checking format strings. The saved_token is
121 used to back up by a single format token during the parsing
122 process. */
123 static gfc_char_t *format_string;
124 static int format_string_pos;
125 static int format_length, use_last_char;
126 static char error_element;
127 static locus format_locus;
128
129 static format_token saved_token;
130
131 static enum
132 { MODE_STRING, MODE_FORMAT, MODE_COPY }
133 mode;
134
135
136 /* Return the next character in the format string. */
137
138 static char
139 next_char (int in_string)
140 {
141 static gfc_char_t c;
142
143 if (use_last_char)
144 {
145 use_last_char = 0;
146 return c;
147 }
148
149 format_length++;
150
151 if (mode == MODE_STRING)
152 c = *format_string++;
153 else
154 {
155 c = gfc_next_char_literal (in_string);
156 if (c == '\n')
157 c = '\0';
158 }
159
160 if (gfc_option.flag_backslash && c == '\\')
161 {
162 locus old_locus = gfc_current_locus;
163
164 if (gfc_match_special_char (&c) == MATCH_NO)
165 gfc_current_locus = old_locus;
166
167 if (!(gfc_option.allow_std & GFC_STD_GNU) && !inhibit_warnings)
168 gfc_warning ("Extension: backslash character at %C");
169 }
170
171 if (mode == MODE_COPY)
172 *format_string++ = c;
173
174 if (mode != MODE_STRING)
175 format_locus = gfc_current_locus;
176
177 format_string_pos++;
178
179 c = gfc_wide_toupper (c);
180 return c;
181 }
182
183
184 /* Back up one character position. Only works once. */
185
186 static void
187 unget_char (void)
188 {
189 use_last_char = 1;
190 }
191
192 /* Eat up the spaces and return a character. */
193
194 static char
195 next_char_not_space (bool *error)
196 {
197 char c;
198 do
199 {
200 error_element = c = next_char (0);
201 if (c == '\t')
202 {
203 if (gfc_option.allow_std & GFC_STD_GNU)
204 gfc_warning ("Extension: Tab character in format at %C");
205 else
206 {
207 gfc_error ("Extension: Tab character in format at %C");
208 *error = true;
209 return c;
210 }
211 }
212 }
213 while (gfc_is_whitespace (c));
214 return c;
215 }
216
217 static int value = 0;
218
219 /* Simple lexical analyzer for getting the next token in a FORMAT
220 statement. */
221
222 static format_token
223 format_lex (void)
224 {
225 format_token token;
226 char c, delim;
227 int zflag;
228 int negative_flag;
229 bool error = false;
230
231 if (saved_token != FMT_NONE)
232 {
233 token = saved_token;
234 saved_token = FMT_NONE;
235 return token;
236 }
237
238 c = next_char_not_space (&error);
239
240 negative_flag = 0;
241 switch (c)
242 {
243 case '-':
244 negative_flag = 1;
245 case '+':
246 c = next_char_not_space (&error);
247 if (!ISDIGIT (c))
248 {
249 token = FMT_UNKNOWN;
250 break;
251 }
252
253 value = c - '0';
254
255 do
256 {
257 c = next_char_not_space (&error);
258 if (ISDIGIT (c))
259 value = 10 * value + c - '0';
260 }
261 while (ISDIGIT (c));
262
263 unget_char ();
264
265 if (negative_flag)
266 value = -value;
267
268 token = FMT_SIGNED_INT;
269 break;
270
271 case '0':
272 case '1':
273 case '2':
274 case '3':
275 case '4':
276 case '5':
277 case '6':
278 case '7':
279 case '8':
280 case '9':
281 zflag = (c == '0');
282
283 value = c - '0';
284
285 do
286 {
287 c = next_char_not_space (&error);
288 if (ISDIGIT (c))
289 {
290 value = 10 * value + c - '0';
291 if (c != '0')
292 zflag = 0;
293 }
294 }
295 while (ISDIGIT (c));
296
297 unget_char ();
298 token = zflag ? FMT_ZERO : FMT_POSINT;
299 break;
300
301 case '.':
302 token = FMT_PERIOD;
303 break;
304
305 case ',':
306 token = FMT_COMMA;
307 break;
308
309 case ':':
310 token = FMT_COLON;
311 break;
312
313 case '/':
314 token = FMT_SLASH;
315 break;
316
317 case '$':
318 token = FMT_DOLLAR;
319 break;
320
321 case 'T':
322 c = next_char_not_space (&error);
323 switch (c)
324 {
325 case 'L':
326 token = FMT_TL;
327 break;
328 case 'R':
329 token = FMT_TR;
330 break;
331 default:
332 token = FMT_T;
333 unget_char ();
334 }
335 break;
336
337 case '(':
338 token = FMT_LPAREN;
339 break;
340
341 case ')':
342 token = FMT_RPAREN;
343 break;
344
345 case 'X':
346 token = FMT_X;
347 break;
348
349 case 'S':
350 c = next_char_not_space (&error);
351 if (c != 'P' && c != 'S')
352 unget_char ();
353
354 token = FMT_SIGN;
355 break;
356
357 case 'B':
358 c = next_char_not_space (&error);
359 if (c == 'N' || c == 'Z')
360 token = FMT_BLANK;
361 else
362 {
363 unget_char ();
364 token = FMT_IBOZ;
365 }
366
367 break;
368
369 case '\'':
370 case '"':
371 delim = c;
372
373 value = 0;
374
375 for (;;)
376 {
377 c = next_char (1);
378 if (c == '\0')
379 {
380 token = FMT_END;
381 break;
382 }
383
384 if (c == delim)
385 {
386 c = next_char (1);
387
388 if (c == '\0')
389 {
390 token = FMT_END;
391 break;
392 }
393
394 if (c != delim)
395 {
396 unget_char ();
397 token = FMT_CHAR;
398 break;
399 }
400 }
401 value++;
402 }
403 break;
404
405 case 'P':
406 token = FMT_P;
407 break;
408
409 case 'I':
410 case 'O':
411 case 'Z':
412 token = FMT_IBOZ;
413 break;
414
415 case 'F':
416 token = FMT_F;
417 break;
418
419 case 'E':
420 c = next_char_not_space (&error);
421 if (c == 'N' )
422 token = FMT_EN;
423 else if (c == 'S')
424 token = FMT_ES;
425 else
426 {
427 token = FMT_E;
428 unget_char ();
429 }
430
431 break;
432
433 case 'G':
434 token = FMT_G;
435 break;
436
437 case 'H':
438 token = FMT_H;
439 break;
440
441 case 'L':
442 token = FMT_L;
443 break;
444
445 case 'A':
446 token = FMT_A;
447 break;
448
449 case 'D':
450 c = next_char_not_space (&error);
451 if (c == 'P')
452 {
453 if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: DP format "
454 "specifier not allowed at %C") == FAILURE)
455 return FMT_ERROR;
456 token = FMT_DP;
457 }
458 else if (c == 'C')
459 {
460 if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: DC format "
461 "specifier not allowed at %C") == FAILURE)
462 return FMT_ERROR;
463 token = FMT_DC;
464 }
465 else
466 {
467 token = FMT_D;
468 unget_char ();
469 }
470 break;
471
472 case 'R':
473 c = next_char_not_space (&error);
474 switch (c)
475 {
476 case 'C':
477 token = FMT_RC;
478 break;
479 case 'D':
480 token = FMT_RD;
481 break;
482 case 'N':
483 token = FMT_RN;
484 break;
485 case 'P':
486 token = FMT_RP;
487 break;
488 case 'U':
489 token = FMT_RU;
490 break;
491 case 'Z':
492 token = FMT_RZ;
493 break;
494 default:
495 token = FMT_UNKNOWN;
496 unget_char ();
497 break;
498 }
499 break;
500
501 case '\0':
502 token = FMT_END;
503 break;
504
505 case '*':
506 token = FMT_STAR;
507 break;
508
509 default:
510 token = FMT_UNKNOWN;
511 break;
512 }
513
514 if (error)
515 return FMT_ERROR;
516
517 return token;
518 }
519
520
521 static const char *
522 token_to_string (format_token t)
523 {
524 switch (t)
525 {
526 case FMT_D:
527 return "D";
528 case FMT_G:
529 return "G";
530 case FMT_E:
531 return "E";
532 case FMT_EN:
533 return "EN";
534 case FMT_ES:
535 return "ES";
536 default:
537 return "";
538 }
539 }
540
541 /* Check a format statement. The format string, either from a FORMAT
542 statement or a constant in an I/O statement has already been parsed
543 by itself, and we are checking it for validity. The dual origin
544 means that the warning message is a little less than great. */
545
546 static gfc_try
547 check_format (bool is_input)
548 {
549 const char *posint_required = _("Positive width required");
550 const char *nonneg_required = _("Nonnegative width required");
551 const char *unexpected_element = _("Unexpected element '%c' in format string"
552 " at %L");
553 const char *unexpected_end = _("Unexpected end of format string");
554 const char *zero_width = _("Zero width in format descriptor");
555
556 const char *error;
557 format_token t, u;
558 int level;
559 int repeat;
560 gfc_try rv;
561
562 use_last_char = 0;
563 saved_token = FMT_NONE;
564 level = 0;
565 repeat = 0;
566 rv = SUCCESS;
567 format_string_pos = 0;
568
569 t = format_lex ();
570 if (t == FMT_ERROR)
571 goto fail;
572 if (t != FMT_LPAREN)
573 {
574 error = _("Missing leading left parenthesis");
575 goto syntax;
576 }
577
578 t = format_lex ();
579 if (t == FMT_ERROR)
580 goto fail;
581 if (t == FMT_RPAREN)
582 goto finished; /* Empty format is legal */
583 saved_token = t;
584
585 format_item:
586 /* In this state, the next thing has to be a format item. */
587 t = format_lex ();
588 if (t == FMT_ERROR)
589 goto fail;
590 format_item_1:
591 switch (t)
592 {
593 case FMT_STAR:
594 repeat = -1;
595 t = format_lex ();
596 if (t == FMT_ERROR)
597 goto fail;
598 if (t == FMT_LPAREN)
599 {
600 level++;
601 goto format_item;
602 }
603 error = _("Left parenthesis required after '*'");
604 goto syntax;
605
606 case FMT_POSINT:
607 repeat = value;
608 t = format_lex ();
609 if (t == FMT_ERROR)
610 goto fail;
611 if (t == FMT_LPAREN)
612 {
613 level++;
614 goto format_item;
615 }
616
617 if (t == FMT_SLASH)
618 goto optional_comma;
619
620 goto data_desc;
621
622 case FMT_LPAREN:
623 level++;
624 goto format_item;
625
626 case FMT_SIGNED_INT:
627 case FMT_ZERO:
628 /* Signed integer can only precede a P format. */
629 t = format_lex ();
630 if (t == FMT_ERROR)
631 goto fail;
632 if (t != FMT_P)
633 {
634 error = _("Expected P edit descriptor");
635 goto syntax;
636 }
637
638 goto data_desc;
639
640 case FMT_P:
641 /* P requires a prior number. */
642 error = _("P descriptor requires leading scale factor");
643 goto syntax;
644
645 case FMT_X:
646 /* X requires a prior number if we're being pedantic. */
647 if (mode != MODE_FORMAT)
648 format_locus.nextc += format_string_pos;
649 if (gfc_notify_std (GFC_STD_GNU, "Extension: X descriptor "
650 "requires leading space count at %L", &format_locus)
651 == FAILURE)
652 return FAILURE;
653 goto between_desc;
654
655 case FMT_SIGN:
656 case FMT_BLANK:
657 case FMT_DP:
658 case FMT_DC:
659 case FMT_RC:
660 case FMT_RD:
661 case FMT_RN:
662 case FMT_RP:
663 case FMT_RU:
664 case FMT_RZ:
665 goto between_desc;
666
667 case FMT_CHAR:
668 goto extension_optional_comma;
669
670 case FMT_COLON:
671 case FMT_SLASH:
672 goto optional_comma;
673
674 case FMT_DOLLAR:
675 t = format_lex ();
676 if (t == FMT_ERROR)
677 goto fail;
678
679 if (gfc_notify_std (GFC_STD_GNU, "Extension: $ descriptor at %L",
680 &format_locus) == FAILURE)
681 return FAILURE;
682 if (t != FMT_RPAREN || level > 0)
683 {
684 gfc_warning ("$ should be the last specifier in format at %L",
685 &format_locus);
686 goto optional_comma_1;
687 }
688
689 goto finished;
690
691 case FMT_T:
692 case FMT_TL:
693 case FMT_TR:
694 case FMT_IBOZ:
695 case FMT_F:
696 case FMT_E:
697 case FMT_EN:
698 case FMT_ES:
699 case FMT_G:
700 case FMT_L:
701 case FMT_A:
702 case FMT_D:
703 case FMT_H:
704 goto data_desc;
705
706 case FMT_END:
707 error = unexpected_end;
708 goto syntax;
709
710 default:
711 error = unexpected_element;
712 goto syntax;
713 }
714
715 data_desc:
716 /* In this state, t must currently be a data descriptor.
717 Deal with things that can/must follow the descriptor. */
718 switch (t)
719 {
720 case FMT_SIGN:
721 case FMT_BLANK:
722 case FMT_DP:
723 case FMT_DC:
724 case FMT_X:
725 break;
726
727 case FMT_P:
728 /* No comma after P allowed only for F, E, EN, ES, D, or G.
729 10.1.1 (1). */
730 t = format_lex ();
731 if (t == FMT_ERROR)
732 goto fail;
733 if (gfc_option.allow_std < GFC_STD_F2003 && t != FMT_COMMA
734 && t != FMT_F && t != FMT_E && t != FMT_EN && t != FMT_ES
735 && t != FMT_D && t != FMT_G && t != FMT_RPAREN && t != FMT_SLASH)
736 {
737 error = _("Comma required after P descriptor");
738 goto syntax;
739 }
740 if (t != FMT_COMMA)
741 {
742 if (t == FMT_POSINT)
743 {
744 t = format_lex ();
745 if (t == FMT_ERROR)
746 goto fail;
747 }
748 if (t != FMT_F && t != FMT_E && t != FMT_EN && t != FMT_ES && t != FMT_D
749 && t != FMT_G && t != FMT_RPAREN && t != FMT_SLASH)
750 {
751 error = _("Comma required after P descriptor");
752 goto syntax;
753 }
754 }
755
756 saved_token = t;
757 goto optional_comma;
758
759 case FMT_T:
760 case FMT_TL:
761 case FMT_TR:
762 t = format_lex ();
763 if (t != FMT_POSINT)
764 {
765 error = _("Positive width required with T descriptor");
766 goto syntax;
767 }
768 break;
769
770 case FMT_L:
771 t = format_lex ();
772 if (t == FMT_ERROR)
773 goto fail;
774 if (t == FMT_POSINT)
775 break;
776
777 switch (gfc_notification_std (GFC_STD_GNU))
778 {
779 case WARNING:
780 if (mode != MODE_FORMAT)
781 format_locus.nextc += format_string_pos;
782 gfc_warning ("Extension: Missing positive width after L "
783 "descriptor at %L", &format_locus);
784 saved_token = t;
785 break;
786
787 case ERROR:
788 error = posint_required;
789 goto syntax;
790
791 case SILENT:
792 saved_token = t;
793 break;
794
795 default:
796 gcc_unreachable ();
797 }
798 break;
799
800 case FMT_A:
801 t = format_lex ();
802 if (t == FMT_ERROR)
803 goto fail;
804 if (t == FMT_ZERO)
805 {
806 error = zero_width;
807 goto syntax;
808 }
809 if (t != FMT_POSINT)
810 saved_token = t;
811 break;
812
813 case FMT_D:
814 case FMT_E:
815 case FMT_G:
816 case FMT_EN:
817 case FMT_ES:
818 u = format_lex ();
819 if (t == FMT_G && u == FMT_ZERO)
820 {
821 if (is_input)
822 {
823 error = zero_width;
824 goto syntax;
825 }
826 if (gfc_notify_std (GFC_STD_F2008, "Fortran 2008: 'G0' in "
827 "format at %L", &format_locus) == FAILURE)
828 return FAILURE;
829 u = format_lex ();
830 if (u != FMT_PERIOD)
831 {
832 saved_token = u;
833 break;
834 }
835 u = format_lex ();
836 if (u != FMT_POSINT)
837 {
838 error = posint_required;
839 goto syntax;
840 }
841 u = format_lex ();
842 if (u == FMT_E)
843 {
844 error = _("E specifier not allowed with g0 descriptor");
845 goto syntax;
846 }
847 saved_token = u;
848 break;
849 }
850
851 if (u != FMT_POSINT)
852 {
853 format_locus.nextc += format_string_pos;
854 gfc_error ("Positive width required in format "
855 "specifier %s at %L", token_to_string (t),
856 &format_locus);
857 saved_token = u;
858 goto fail;
859 }
860
861 u = format_lex ();
862 if (u == FMT_ERROR)
863 goto fail;
864 if (u != FMT_PERIOD)
865 {
866 /* Warn if -std=legacy, otherwise error. */
867 format_locus.nextc += format_string_pos;
868 if (gfc_option.warn_std != 0)
869 {
870 gfc_error ("Period required in format "
871 "specifier %s at %L", token_to_string (t),
872 &format_locus);
873 saved_token = u;
874 goto fail;
875 }
876 else
877 gfc_warning ("Period required in format "
878 "specifier %s at %L", token_to_string (t),
879 &format_locus);
880 /* If we go to finished, we need to unwind this
881 before the next round. */
882 format_locus.nextc -= format_string_pos;
883 saved_token = u;
884 break;
885 }
886
887 u = format_lex ();
888 if (u == FMT_ERROR)
889 goto fail;
890 if (u != FMT_ZERO && u != FMT_POSINT)
891 {
892 error = nonneg_required;
893 goto syntax;
894 }
895
896 if (t == FMT_D)
897 break;
898
899 /* Look for optional exponent. */
900 u = format_lex ();
901 if (u == FMT_ERROR)
902 goto fail;
903 if (u != FMT_E)
904 {
905 saved_token = u;
906 }
907 else
908 {
909 u = format_lex ();
910 if (u == FMT_ERROR)
911 goto fail;
912 if (u != FMT_POSINT)
913 {
914 error = _("Positive exponent width required");
915 goto syntax;
916 }
917 }
918
919 break;
920
921 case FMT_F:
922 t = format_lex ();
923 if (t == FMT_ERROR)
924 goto fail;
925 if (t != FMT_ZERO && t != FMT_POSINT)
926 {
927 error = nonneg_required;
928 goto syntax;
929 }
930 else if (is_input && t == FMT_ZERO)
931 {
932 error = posint_required;
933 goto syntax;
934 }
935
936 t = format_lex ();
937 if (t == FMT_ERROR)
938 goto fail;
939 if (t != FMT_PERIOD)
940 {
941 /* Warn if -std=legacy, otherwise error. */
942 if (gfc_option.warn_std != 0)
943 {
944 error = _("Period required in format specifier");
945 goto syntax;
946 }
947 if (mode != MODE_FORMAT)
948 format_locus.nextc += format_string_pos;
949 gfc_warning ("Period required in format specifier at %L",
950 &format_locus);
951 saved_token = t;
952 break;
953 }
954
955 t = format_lex ();
956 if (t == FMT_ERROR)
957 goto fail;
958 if (t != FMT_ZERO && t != FMT_POSINT)
959 {
960 error = nonneg_required;
961 goto syntax;
962 }
963
964 break;
965
966 case FMT_H:
967 if (!(gfc_option.allow_std & GFC_STD_GNU) && !inhibit_warnings)
968 {
969 if (mode != MODE_FORMAT)
970 format_locus.nextc += format_string_pos;
971 gfc_warning ("The H format specifier at %L is"
972 " a Fortran 95 deleted feature", &format_locus);
973 }
974 if (mode == MODE_STRING)
975 {
976 format_string += value;
977 format_length -= value;
978 format_string_pos += repeat;
979 }
980 else
981 {
982 while (repeat >0)
983 {
984 next_char (1);
985 repeat -- ;
986 }
987 }
988 break;
989
990 case FMT_IBOZ:
991 t = format_lex ();
992 if (t == FMT_ERROR)
993 goto fail;
994 if (t != FMT_ZERO && t != FMT_POSINT)
995 {
996 error = nonneg_required;
997 goto syntax;
998 }
999 else if (is_input && t == FMT_ZERO)
1000 {
1001 error = posint_required;
1002 goto syntax;
1003 }
1004
1005 t = format_lex ();
1006 if (t == FMT_ERROR)
1007 goto fail;
1008 if (t != FMT_PERIOD)
1009 {
1010 saved_token = t;
1011 }
1012 else
1013 {
1014 t = format_lex ();
1015 if (t == FMT_ERROR)
1016 goto fail;
1017 if (t != FMT_ZERO && t != FMT_POSINT)
1018 {
1019 error = nonneg_required;
1020 goto syntax;
1021 }
1022 }
1023
1024 break;
1025
1026 default:
1027 error = unexpected_element;
1028 goto syntax;
1029 }
1030
1031 between_desc:
1032 /* Between a descriptor and what comes next. */
1033 t = format_lex ();
1034 if (t == FMT_ERROR)
1035 goto fail;
1036 switch (t)
1037 {
1038
1039 case FMT_COMMA:
1040 goto format_item;
1041
1042 case FMT_RPAREN:
1043 level--;
1044 if (level < 0)
1045 goto finished;
1046 goto between_desc;
1047
1048 case FMT_COLON:
1049 case FMT_SLASH:
1050 goto optional_comma;
1051
1052 case FMT_END:
1053 error = unexpected_end;
1054 goto syntax;
1055
1056 default:
1057 if (mode != MODE_FORMAT)
1058 format_locus.nextc += format_string_pos - 1;
1059 if (gfc_notify_std (GFC_STD_GNU, "Extension: Missing comma at %L",
1060 &format_locus) == FAILURE)
1061 return FAILURE;
1062 /* If we do not actually return a failure, we need to unwind this
1063 before the next round. */
1064 if (mode != MODE_FORMAT)
1065 format_locus.nextc -= format_string_pos;
1066 goto format_item_1;
1067 }
1068
1069 optional_comma:
1070 /* Optional comma is a weird between state where we've just finished
1071 reading a colon, slash, dollar or P descriptor. */
1072 t = format_lex ();
1073 if (t == FMT_ERROR)
1074 goto fail;
1075 optional_comma_1:
1076 switch (t)
1077 {
1078 case FMT_COMMA:
1079 break;
1080
1081 case FMT_RPAREN:
1082 level--;
1083 if (level < 0)
1084 goto finished;
1085 goto between_desc;
1086
1087 default:
1088 /* Assume that we have another format item. */
1089 saved_token = t;
1090 break;
1091 }
1092
1093 goto format_item;
1094
1095 extension_optional_comma:
1096 /* As a GNU extension, permit a missing comma after a string literal. */
1097 t = format_lex ();
1098 if (t == FMT_ERROR)
1099 goto fail;
1100 switch (t)
1101 {
1102 case FMT_COMMA:
1103 break;
1104
1105 case FMT_RPAREN:
1106 level--;
1107 if (level < 0)
1108 goto finished;
1109 goto between_desc;
1110
1111 case FMT_COLON:
1112 case FMT_SLASH:
1113 goto optional_comma;
1114
1115 case FMT_END:
1116 error = unexpected_end;
1117 goto syntax;
1118
1119 default:
1120 if (mode != MODE_FORMAT)
1121 format_locus.nextc += format_string_pos;
1122 if (gfc_notify_std (GFC_STD_GNU, "Extension: Missing comma at %L",
1123 &format_locus) == FAILURE)
1124 return FAILURE;
1125 /* If we do not actually return a failure, we need to unwind this
1126 before the next round. */
1127 if (mode != MODE_FORMAT)
1128 format_locus.nextc -= format_string_pos;
1129 saved_token = t;
1130 break;
1131 }
1132
1133 goto format_item;
1134
1135 syntax:
1136 if (mode != MODE_FORMAT)
1137 format_locus.nextc += format_string_pos;
1138 if (error == unexpected_element)
1139 gfc_error (error, error_element, &format_locus);
1140 else
1141 gfc_error ("%s in format string at %L", error, &format_locus);
1142 fail:
1143 rv = FAILURE;
1144
1145 finished:
1146 return rv;
1147 }
1148
1149
1150 /* Given an expression node that is a constant string, see if it looks
1151 like a format string. */
1152
1153 static gfc_try
1154 check_format_string (gfc_expr *e, bool is_input)
1155 {
1156 gfc_try rv;
1157 int i;
1158 if (!e || e->ts.type != BT_CHARACTER || e->expr_type != EXPR_CONSTANT)
1159 return SUCCESS;
1160
1161 mode = MODE_STRING;
1162 format_string = e->value.character.string;
1163
1164 /* More elaborate measures are needed to show where a problem is within a
1165 format string that has been calculated, but that's probably not worth the
1166 effort. */
1167 format_locus = e->where;
1168 rv = check_format (is_input);
1169 /* check for extraneous characters at the end of an otherwise valid format
1170 string, like '(A10,I3)F5'
1171 start at the end and move back to the last character processed,
1172 spaces are OK */
1173 if (rv == SUCCESS && e->value.character.length > format_string_pos)
1174 for (i=e->value.character.length-1;i>format_string_pos-1;i--)
1175 if (e->value.character.string[i] != ' ')
1176 {
1177 format_locus.nextc += format_length + 1;
1178 gfc_warning ("Extraneous characters in format at %L", &format_locus);
1179 break;
1180 }
1181 return rv;
1182 }
1183
1184
1185 /************ Fortran 95 I/O statement matchers *************/
1186
1187 /* Match a FORMAT statement. This amounts to actually parsing the
1188 format descriptors in order to correctly locate the end of the
1189 format string. */
1190
1191 match
1192 gfc_match_format (void)
1193 {
1194 gfc_expr *e;
1195 locus start;
1196
1197 if (gfc_current_ns->proc_name
1198 && gfc_current_ns->proc_name->attr.flavor == FL_MODULE)
1199 {
1200 gfc_error ("Format statement in module main block at %C");
1201 return MATCH_ERROR;
1202 }
1203
1204 if (gfc_statement_label == NULL)
1205 {
1206 gfc_error ("Missing format label at %C");
1207 return MATCH_ERROR;
1208 }
1209 gfc_gobble_whitespace ();
1210
1211 mode = MODE_FORMAT;
1212 format_length = 0;
1213
1214 start = gfc_current_locus;
1215
1216 if (check_format (false) == FAILURE)
1217 return MATCH_ERROR;
1218
1219 if (gfc_match_eos () != MATCH_YES)
1220 {
1221 gfc_syntax_error (ST_FORMAT);
1222 return MATCH_ERROR;
1223 }
1224
1225 /* The label doesn't get created until after the statement is done
1226 being matched, so we have to leave the string for later. */
1227
1228 gfc_current_locus = start; /* Back to the beginning */
1229
1230 new_st.loc = start;
1231 new_st.op = EXEC_NOP;
1232
1233 e = gfc_get_character_expr (gfc_default_character_kind, &start,
1234 NULL, format_length);
1235 format_string = e->value.character.string;
1236 gfc_statement_label->format = e;
1237
1238 mode = MODE_COPY;
1239 check_format (false); /* Guaranteed to succeed */
1240 gfc_match_eos (); /* Guaranteed to succeed */
1241
1242 return MATCH_YES;
1243 }
1244
1245
1246 /* Match an expression I/O tag of some sort. */
1247
1248 static match
1249 match_etag (const io_tag *tag, gfc_expr **v)
1250 {
1251 gfc_expr *result;
1252 match m;
1253
1254 m = gfc_match (tag->spec);
1255 if (m != MATCH_YES)
1256 return m;
1257
1258 m = gfc_match (tag->value, &result);
1259 if (m != MATCH_YES)
1260 {
1261 gfc_error ("Invalid value for %s specification at %C", tag->name);
1262 return MATCH_ERROR;
1263 }
1264
1265 if (*v != NULL)
1266 {
1267 gfc_error ("Duplicate %s specification at %C", tag->name);
1268 gfc_free_expr (result);
1269 return MATCH_ERROR;
1270 }
1271
1272 *v = result;
1273 return MATCH_YES;
1274 }
1275
1276
1277 /* Match a variable I/O tag of some sort. */
1278
1279 static match
1280 match_vtag (const io_tag *tag, gfc_expr **v)
1281 {
1282 gfc_expr *result;
1283 match m;
1284
1285 m = gfc_match (tag->spec);
1286 if (m != MATCH_YES)
1287 return m;
1288
1289 m = gfc_match (tag->value, &result);
1290 if (m != MATCH_YES)
1291 {
1292 gfc_error ("Invalid value for %s specification at %C", tag->name);
1293 return MATCH_ERROR;
1294 }
1295
1296 if (*v != NULL)
1297 {
1298 gfc_error ("Duplicate %s specification at %C", tag->name);
1299 gfc_free_expr (result);
1300 return MATCH_ERROR;
1301 }
1302
1303 if (result->symtree->n.sym->attr.intent == INTENT_IN)
1304 {
1305 gfc_error ("Variable %s cannot be INTENT(IN) at %C", tag->name);
1306 gfc_free_expr (result);
1307 return MATCH_ERROR;
1308 }
1309
1310 if (gfc_pure (NULL) && gfc_impure_variable (result->symtree->n.sym))
1311 {
1312 gfc_error ("Variable %s cannot be assigned in PURE procedure at %C",
1313 tag->name);
1314 gfc_free_expr (result);
1315 return MATCH_ERROR;
1316 }
1317
1318 *v = result;
1319 return MATCH_YES;
1320 }
1321
1322
1323 /* Match I/O tags that cause variables to become redefined. */
1324
1325 static match
1326 match_out_tag (const io_tag *tag, gfc_expr **result)
1327 {
1328 match m;
1329
1330 m = match_vtag (tag, result);
1331 if (m == MATCH_YES)
1332 gfc_check_do_variable ((*result)->symtree);
1333
1334 return m;
1335 }
1336
1337
1338 /* Match a label I/O tag. */
1339
1340 static match
1341 match_ltag (const io_tag *tag, gfc_st_label ** label)
1342 {
1343 match m;
1344 gfc_st_label *old;
1345
1346 old = *label;
1347 m = gfc_match (tag->spec);
1348 if (m != MATCH_YES)
1349 return m;
1350
1351 m = gfc_match (tag->value, label);
1352 if (m != MATCH_YES)
1353 {
1354 gfc_error ("Invalid value for %s specification at %C", tag->name);
1355 return MATCH_ERROR;
1356 }
1357
1358 if (old)
1359 {
1360 gfc_error ("Duplicate %s label specification at %C", tag->name);
1361 return MATCH_ERROR;
1362 }
1363
1364 if (gfc_reference_st_label (*label, ST_LABEL_TARGET) == FAILURE)
1365 return MATCH_ERROR;
1366
1367 return m;
1368 }
1369
1370
1371 /* Resolution of the FORMAT tag, to be called from resolve_tag. */
1372
1373 static gfc_try
1374 resolve_tag_format (const gfc_expr *e)
1375 {
1376 if (e->expr_type == EXPR_CONSTANT
1377 && (e->ts.type != BT_CHARACTER
1378 || e->ts.kind != gfc_default_character_kind))
1379 {
1380 gfc_error ("Constant expression in FORMAT tag at %L must be "
1381 "of type default CHARACTER", &e->where);
1382 return FAILURE;
1383 }
1384
1385 /* If e's rank is zero and e is not an element of an array, it should be
1386 of integer or character type. The integer variable should be
1387 ASSIGNED. */
1388 if (e->rank == 0
1389 && (e->expr_type != EXPR_VARIABLE
1390 || e->symtree == NULL
1391 || e->symtree->n.sym->as == NULL
1392 || e->symtree->n.sym->as->rank == 0))
1393 {
1394 if (e->ts.type != BT_CHARACTER && e->ts.type != BT_INTEGER)
1395 {
1396 gfc_error ("FORMAT tag at %L must be of type CHARACTER or INTEGER",
1397 &e->where);
1398 return FAILURE;
1399 }
1400 else if (e->ts.type == BT_INTEGER && e->expr_type == EXPR_VARIABLE)
1401 {
1402 if (gfc_notify_std (GFC_STD_F95_DEL, "Deleted feature: ASSIGNED "
1403 "variable in FORMAT tag at %L", &e->where)
1404 == FAILURE)
1405 return FAILURE;
1406 if (e->symtree->n.sym->attr.assign != 1)
1407 {
1408 gfc_error ("Variable '%s' at %L has not been assigned a "
1409 "format label", e->symtree->n.sym->name, &e->where);
1410 return FAILURE;
1411 }
1412 }
1413 else if (e->ts.type == BT_INTEGER)
1414 {
1415 gfc_error ("Scalar '%s' in FORMAT tag at %L is not an ASSIGNED "
1416 "variable", gfc_basic_typename (e->ts.type), &e->where);
1417 return FAILURE;
1418 }
1419
1420 return SUCCESS;
1421 }
1422
1423 /* If rank is nonzero and type is not character, we allow it under GFC_STD_LEGACY.
1424 It may be assigned an Hollerith constant. */
1425 if (e->ts.type != BT_CHARACTER)
1426 {
1427 if (gfc_notify_std (GFC_STD_LEGACY, "Extension: Non-character "
1428 "in FORMAT tag at %L", &e->where) == FAILURE)
1429 return FAILURE;
1430
1431 if (e->rank == 0 && e->symtree->n.sym->as->type == AS_ASSUMED_SHAPE)
1432 {
1433 gfc_error ("Non-character assumed shape array element in FORMAT"
1434 " tag at %L", &e->where);
1435 return FAILURE;
1436 }
1437
1438 if (e->rank == 0 && e->symtree->n.sym->as->type == AS_ASSUMED_SIZE)
1439 {
1440 gfc_error ("Non-character assumed size array element in FORMAT"
1441 " tag at %L", &e->where);
1442 return FAILURE;
1443 }
1444
1445 if (e->rank == 0 && e->symtree->n.sym->attr.pointer)
1446 {
1447 gfc_error ("Non-character pointer array element in FORMAT tag at %L",
1448 &e->where);
1449 return FAILURE;
1450 }
1451 }
1452
1453 return SUCCESS;
1454 }
1455
1456
1457 /* Do expression resolution and type-checking on an expression tag. */
1458
1459 static gfc_try
1460 resolve_tag (const io_tag *tag, gfc_expr *e)
1461 {
1462 if (e == NULL)
1463 return SUCCESS;
1464
1465 if (gfc_resolve_expr (e) == FAILURE)
1466 return FAILURE;
1467
1468 if (tag == &tag_format)
1469 return resolve_tag_format (e);
1470
1471 if (e->ts.type != tag->type)
1472 {
1473 gfc_error ("%s tag at %L must be of type %s", tag->name,
1474 &e->where, gfc_basic_typename (tag->type));
1475 return FAILURE;
1476 }
1477
1478 if (e->rank != 0)
1479 {
1480 gfc_error ("%s tag at %L must be scalar", tag->name, &e->where);
1481 return FAILURE;
1482 }
1483
1484 if (tag == &tag_iomsg)
1485 {
1486 if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: IOMSG tag at %L",
1487 &e->where) == FAILURE)
1488 return FAILURE;
1489 }
1490
1491 if ((tag == &tag_iostat || tag == &tag_size || tag == &tag_iolength)
1492 && e->ts.kind != gfc_default_integer_kind)
1493 {
1494 if (gfc_notify_std (GFC_STD_F2003, "Fortran 95 requires default "
1495 "INTEGER in %s tag at %L", tag->name, &e->where)
1496 == FAILURE)
1497 return FAILURE;
1498 }
1499
1500 if (tag == &tag_convert)
1501 {
1502 if (gfc_notify_std (GFC_STD_GNU, "Extension: CONVERT tag at %L",
1503 &e->where) == FAILURE)
1504 return FAILURE;
1505 }
1506
1507 return SUCCESS;
1508 }
1509
1510
1511 /* Match a single tag of an OPEN statement. */
1512
1513 static match
1514 match_open_element (gfc_open *open)
1515 {
1516 match m;
1517
1518 m = match_etag (&tag_e_async, &open->asynchronous);
1519 if (m != MATCH_NO)
1520 return m;
1521 m = match_etag (&tag_unit, &open->unit);
1522 if (m != MATCH_NO)
1523 return m;
1524 m = match_out_tag (&tag_iomsg, &open->iomsg);
1525 if (m != MATCH_NO)
1526 return m;
1527 m = match_out_tag (&tag_iostat, &open->iostat);
1528 if (m != MATCH_NO)
1529 return m;
1530 m = match_etag (&tag_file, &open->file);
1531 if (m != MATCH_NO)
1532 return m;
1533 m = match_etag (&tag_status, &open->status);
1534 if (m != MATCH_NO)
1535 return m;
1536 m = match_etag (&tag_e_access, &open->access);
1537 if (m != MATCH_NO)
1538 return m;
1539 m = match_etag (&tag_e_form, &open->form);
1540 if (m != MATCH_NO)
1541 return m;
1542 m = match_etag (&tag_e_recl, &open->recl);
1543 if (m != MATCH_NO)
1544 return m;
1545 m = match_etag (&tag_e_blank, &open->blank);
1546 if (m != MATCH_NO)
1547 return m;
1548 m = match_etag (&tag_e_position, &open->position);
1549 if (m != MATCH_NO)
1550 return m;
1551 m = match_etag (&tag_e_action, &open->action);
1552 if (m != MATCH_NO)
1553 return m;
1554 m = match_etag (&tag_e_delim, &open->delim);
1555 if (m != MATCH_NO)
1556 return m;
1557 m = match_etag (&tag_e_pad, &open->pad);
1558 if (m != MATCH_NO)
1559 return m;
1560 m = match_etag (&tag_e_decimal, &open->decimal);
1561 if (m != MATCH_NO)
1562 return m;
1563 m = match_etag (&tag_e_encoding, &open->encoding);
1564 if (m != MATCH_NO)
1565 return m;
1566 m = match_etag (&tag_e_round, &open->round);
1567 if (m != MATCH_NO)
1568 return m;
1569 m = match_etag (&tag_e_sign, &open->sign);
1570 if (m != MATCH_NO)
1571 return m;
1572 m = match_ltag (&tag_err, &open->err);
1573 if (m != MATCH_NO)
1574 return m;
1575 m = match_etag (&tag_convert, &open->convert);
1576 if (m != MATCH_NO)
1577 return m;
1578 m = match_out_tag (&tag_newunit, &open->newunit);
1579 if (m != MATCH_NO)
1580 return m;
1581
1582 return MATCH_NO;
1583 }
1584
1585
1586 /* Free the gfc_open structure and all the expressions it contains. */
1587
1588 void
1589 gfc_free_open (gfc_open *open)
1590 {
1591 if (open == NULL)
1592 return;
1593
1594 gfc_free_expr (open->unit);
1595 gfc_free_expr (open->iomsg);
1596 gfc_free_expr (open->iostat);
1597 gfc_free_expr (open->file);
1598 gfc_free_expr (open->status);
1599 gfc_free_expr (open->access);
1600 gfc_free_expr (open->form);
1601 gfc_free_expr (open->recl);
1602 gfc_free_expr (open->blank);
1603 gfc_free_expr (open->position);
1604 gfc_free_expr (open->action);
1605 gfc_free_expr (open->delim);
1606 gfc_free_expr (open->pad);
1607 gfc_free_expr (open->decimal);
1608 gfc_free_expr (open->encoding);
1609 gfc_free_expr (open->round);
1610 gfc_free_expr (open->sign);
1611 gfc_free_expr (open->convert);
1612 gfc_free_expr (open->asynchronous);
1613 gfc_free_expr (open->newunit);
1614 gfc_free (open);
1615 }
1616
1617
1618 /* Resolve everything in a gfc_open structure. */
1619
1620 gfc_try
1621 gfc_resolve_open (gfc_open *open)
1622 {
1623
1624 RESOLVE_TAG (&tag_unit, open->unit);
1625 RESOLVE_TAG (&tag_iomsg, open->iomsg);
1626 RESOLVE_TAG (&tag_iostat, open->iostat);
1627 RESOLVE_TAG (&tag_file, open->file);
1628 RESOLVE_TAG (&tag_status, open->status);
1629 RESOLVE_TAG (&tag_e_access, open->access);
1630 RESOLVE_TAG (&tag_e_form, open->form);
1631 RESOLVE_TAG (&tag_e_recl, open->recl);
1632 RESOLVE_TAG (&tag_e_blank, open->blank);
1633 RESOLVE_TAG (&tag_e_position, open->position);
1634 RESOLVE_TAG (&tag_e_action, open->action);
1635 RESOLVE_TAG (&tag_e_delim, open->delim);
1636 RESOLVE_TAG (&tag_e_pad, open->pad);
1637 RESOLVE_TAG (&tag_e_decimal, open->decimal);
1638 RESOLVE_TAG (&tag_e_encoding, open->encoding);
1639 RESOLVE_TAG (&tag_e_async, open->asynchronous);
1640 RESOLVE_TAG (&tag_e_round, open->round);
1641 RESOLVE_TAG (&tag_e_sign, open->sign);
1642 RESOLVE_TAG (&tag_convert, open->convert);
1643 RESOLVE_TAG (&tag_newunit, open->newunit);
1644
1645 if (gfc_reference_st_label (open->err, ST_LABEL_TARGET) == FAILURE)
1646 return FAILURE;
1647
1648 return SUCCESS;
1649 }
1650
1651
1652 /* Check if a given value for a SPECIFIER is either in the list of values
1653 allowed in F95 or F2003, issuing an error message and returning a zero
1654 value if it is not allowed. */
1655
1656 static int
1657 compare_to_allowed_values (const char *specifier, const char *allowed[],
1658 const char *allowed_f2003[],
1659 const char *allowed_gnu[], gfc_char_t *value,
1660 const char *statement, bool warn)
1661 {
1662 int i;
1663 unsigned int len;
1664
1665 len = gfc_wide_strlen (value);
1666 if (len > 0)
1667 {
1668 for (len--; len > 0; len--)
1669 if (value[len] != ' ')
1670 break;
1671 len++;
1672 }
1673
1674 for (i = 0; allowed[i]; i++)
1675 if (len == strlen (allowed[i])
1676 && gfc_wide_strncasecmp (value, allowed[i], strlen (allowed[i])) == 0)
1677 return 1;
1678
1679 for (i = 0; allowed_f2003 && allowed_f2003[i]; i++)
1680 if (len == strlen (allowed_f2003[i])
1681 && gfc_wide_strncasecmp (value, allowed_f2003[i],
1682 strlen (allowed_f2003[i])) == 0)
1683 {
1684 notification n = gfc_notification_std (GFC_STD_F2003);
1685
1686 if (n == WARNING || (warn && n == ERROR))
1687 {
1688 gfc_warning ("Fortran 2003: %s specifier in %s statement at %C "
1689 "has value '%s'", specifier, statement,
1690 allowed_f2003[i]);
1691 return 1;
1692 }
1693 else
1694 if (n == ERROR)
1695 {
1696 gfc_notify_std (GFC_STD_F2003, "Fortran 2003: %s specifier in "
1697 "%s statement at %C has value '%s'", specifier,
1698 statement, allowed_f2003[i]);
1699 return 0;
1700 }
1701
1702 /* n == SILENT */
1703 return 1;
1704 }
1705
1706 for (i = 0; allowed_gnu && allowed_gnu[i]; i++)
1707 if (len == strlen (allowed_gnu[i])
1708 && gfc_wide_strncasecmp (value, allowed_gnu[i],
1709 strlen (allowed_gnu[i])) == 0)
1710 {
1711 notification n = gfc_notification_std (GFC_STD_GNU);
1712
1713 if (n == WARNING || (warn && n == ERROR))
1714 {
1715 gfc_warning ("Extension: %s specifier in %s statement at %C "
1716 "has value '%s'", specifier, statement,
1717 allowed_gnu[i]);
1718 return 1;
1719 }
1720 else
1721 if (n == ERROR)
1722 {
1723 gfc_notify_std (GFC_STD_GNU, "Extension: %s specifier in "
1724 "%s statement at %C has value '%s'", specifier,
1725 statement, allowed_gnu[i]);
1726 return 0;
1727 }
1728
1729 /* n == SILENT */
1730 return 1;
1731 }
1732
1733 if (warn)
1734 {
1735 char *s = gfc_widechar_to_char (value, -1);
1736 gfc_warning ("%s specifier in %s statement at %C has invalid value '%s'",
1737 specifier, statement, s);
1738 gfc_free (s);
1739 return 1;
1740 }
1741 else
1742 {
1743 char *s = gfc_widechar_to_char (value, -1);
1744 gfc_error ("%s specifier in %s statement at %C has invalid value '%s'",
1745 specifier, statement, s);
1746 gfc_free (s);
1747 return 0;
1748 }
1749 }
1750
1751
1752 /* Match an OPEN statement. */
1753
1754 match
1755 gfc_match_open (void)
1756 {
1757 gfc_open *open;
1758 match m;
1759 bool warn;
1760
1761 m = gfc_match_char ('(');
1762 if (m == MATCH_NO)
1763 return m;
1764
1765 open = XCNEW (gfc_open);
1766
1767 m = match_open_element (open);
1768
1769 if (m == MATCH_ERROR)
1770 goto cleanup;
1771 if (m == MATCH_NO)
1772 {
1773 m = gfc_match_expr (&open->unit);
1774 if (m == MATCH_NO)
1775 goto syntax;
1776 if (m == MATCH_ERROR)
1777 goto cleanup;
1778 }
1779
1780 for (;;)
1781 {
1782 if (gfc_match_char (')') == MATCH_YES)
1783 break;
1784 if (gfc_match_char (',') != MATCH_YES)
1785 goto syntax;
1786
1787 m = match_open_element (open);
1788 if (m == MATCH_ERROR)
1789 goto cleanup;
1790 if (m == MATCH_NO)
1791 goto syntax;
1792 }
1793
1794 if (gfc_match_eos () == MATCH_NO)
1795 goto syntax;
1796
1797 if (gfc_pure (NULL))
1798 {
1799 gfc_error ("OPEN statement not allowed in PURE procedure at %C");
1800 goto cleanup;
1801 }
1802
1803 warn = (open->err || open->iostat) ? true : false;
1804
1805 /* Checks on NEWUNIT specifier. */
1806 if (open->newunit)
1807 {
1808 if (open->unit)
1809 {
1810 gfc_error ("UNIT specifier not allowed with NEWUNIT at %C");
1811 goto cleanup;
1812 }
1813
1814 if (!(open->file || (open->status
1815 && gfc_wide_strncasecmp (open->status->value.character.string,
1816 "scratch", 7) == 0)))
1817 {
1818 gfc_error ("NEWUNIT specifier must have FILE= "
1819 "or STATUS='scratch' at %C");
1820 goto cleanup;
1821 }
1822 }
1823
1824 /* Checks on the ACCESS specifier. */
1825 if (open->access && open->access->expr_type == EXPR_CONSTANT)
1826 {
1827 static const char *access_f95[] = { "SEQUENTIAL", "DIRECT", NULL };
1828 static const char *access_f2003[] = { "STREAM", NULL };
1829 static const char *access_gnu[] = { "APPEND", NULL };
1830
1831 if (!compare_to_allowed_values ("ACCESS", access_f95, access_f2003,
1832 access_gnu,
1833 open->access->value.character.string,
1834 "OPEN", warn))
1835 goto cleanup;
1836 }
1837
1838 /* Checks on the ACTION specifier. */
1839 if (open->action && open->action->expr_type == EXPR_CONSTANT)
1840 {
1841 static const char *action[] = { "READ", "WRITE", "READWRITE", NULL };
1842
1843 if (!compare_to_allowed_values ("ACTION", action, NULL, NULL,
1844 open->action->value.character.string,
1845 "OPEN", warn))
1846 goto cleanup;
1847 }
1848
1849 /* Checks on the ASYNCHRONOUS specifier. */
1850 if (open->asynchronous)
1851 {
1852 if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: ASYNCHRONOUS= at %C "
1853 "not allowed in Fortran 95") == FAILURE)
1854 goto cleanup;
1855
1856 if (open->asynchronous->expr_type == EXPR_CONSTANT)
1857 {
1858 static const char * asynchronous[] = { "YES", "NO", NULL };
1859
1860 if (!compare_to_allowed_values ("ASYNCHRONOUS", asynchronous,
1861 NULL, NULL, open->asynchronous->value.character.string,
1862 "OPEN", warn))
1863 goto cleanup;
1864 }
1865 }
1866
1867 /* Checks on the BLANK specifier. */
1868 if (open->blank)
1869 {
1870 if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: BLANK= at %C "
1871 "not allowed in Fortran 95") == FAILURE)
1872 goto cleanup;
1873
1874 if (open->blank->expr_type == EXPR_CONSTANT)
1875 {
1876 static const char *blank[] = { "ZERO", "NULL", NULL };
1877
1878 if (!compare_to_allowed_values ("BLANK", blank, NULL, NULL,
1879 open->blank->value.character.string,
1880 "OPEN", warn))
1881 goto cleanup;
1882 }
1883 }
1884
1885 /* Checks on the DECIMAL specifier. */
1886 if (open->decimal)
1887 {
1888 if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: DECIMAL= at %C "
1889 "not allowed in Fortran 95") == FAILURE)
1890 goto cleanup;
1891
1892 if (open->decimal->expr_type == EXPR_CONSTANT)
1893 {
1894 static const char * decimal[] = { "COMMA", "POINT", NULL };
1895
1896 if (!compare_to_allowed_values ("DECIMAL", decimal, NULL, NULL,
1897 open->decimal->value.character.string,
1898 "OPEN", warn))
1899 goto cleanup;
1900 }
1901 }
1902
1903 /* Checks on the DELIM specifier. */
1904 if (open->delim)
1905 {
1906 if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: DELIM= at %C "
1907 "not allowed in Fortran 95") == FAILURE)
1908 goto cleanup;
1909
1910 if (open->delim->expr_type == EXPR_CONSTANT)
1911 {
1912 static const char *delim[] = { "APOSTROPHE", "QUOTE", "NONE", NULL };
1913
1914 if (!compare_to_allowed_values ("DELIM", delim, NULL, NULL,
1915 open->delim->value.character.string,
1916 "OPEN", warn))
1917 goto cleanup;
1918 }
1919 }
1920
1921 /* Checks on the ENCODING specifier. */
1922 if (open->encoding)
1923 {
1924 if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: ENCODING= at %C "
1925 "not allowed in Fortran 95") == FAILURE)
1926 goto cleanup;
1927
1928 if (open->encoding->expr_type == EXPR_CONSTANT)
1929 {
1930 static const char * encoding[] = { "DEFAULT", "UTF-8", NULL };
1931
1932 if (!compare_to_allowed_values ("ENCODING", encoding, NULL, NULL,
1933 open->encoding->value.character.string,
1934 "OPEN", warn))
1935 goto cleanup;
1936 }
1937 }
1938
1939 /* Checks on the FORM specifier. */
1940 if (open->form && open->form->expr_type == EXPR_CONSTANT)
1941 {
1942 static const char *form[] = { "FORMATTED", "UNFORMATTED", NULL };
1943
1944 if (!compare_to_allowed_values ("FORM", form, NULL, NULL,
1945 open->form->value.character.string,
1946 "OPEN", warn))
1947 goto cleanup;
1948 }
1949
1950 /* Checks on the PAD specifier. */
1951 if (open->pad && open->pad->expr_type == EXPR_CONSTANT)
1952 {
1953 static const char *pad[] = { "YES", "NO", NULL };
1954
1955 if (!compare_to_allowed_values ("PAD", pad, NULL, NULL,
1956 open->pad->value.character.string,
1957 "OPEN", warn))
1958 goto cleanup;
1959 }
1960
1961 /* Checks on the POSITION specifier. */
1962 if (open->position && open->position->expr_type == EXPR_CONSTANT)
1963 {
1964 static const char *position[] = { "ASIS", "REWIND", "APPEND", NULL };
1965
1966 if (!compare_to_allowed_values ("POSITION", position, NULL, NULL,
1967 open->position->value.character.string,
1968 "OPEN", warn))
1969 goto cleanup;
1970 }
1971
1972 /* Checks on the ROUND specifier. */
1973 if (open->round)
1974 {
1975 if (gfc_notify_std (GFC_STD_F2003, "Fortran F2003: ROUND= at %C "
1976 "not allowed in Fortran 95") == FAILURE)
1977 goto cleanup;
1978
1979 if (open->round->expr_type == EXPR_CONSTANT)
1980 {
1981 static const char * round[] = { "UP", "DOWN", "ZERO", "NEAREST",
1982 "COMPATIBLE", "PROCESSOR_DEFINED",
1983 NULL };
1984
1985 if (!compare_to_allowed_values ("ROUND", round, NULL, NULL,
1986 open->round->value.character.string,
1987 "OPEN", warn))
1988 goto cleanup;
1989 }
1990 }
1991
1992 /* Checks on the SIGN specifier. */
1993 if (open->sign)
1994 {
1995 if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: SIGN= at %C "
1996 "not allowed in Fortran 95") == FAILURE)
1997 goto cleanup;
1998
1999 if (open->sign->expr_type == EXPR_CONSTANT)
2000 {
2001 static const char * sign[] = { "PLUS", "SUPPRESS", "PROCESSOR_DEFINED",
2002 NULL };
2003
2004 if (!compare_to_allowed_values ("SIGN", sign, NULL, NULL,
2005 open->sign->value.character.string,
2006 "OPEN", warn))
2007 goto cleanup;
2008 }
2009 }
2010
2011 #define warn_or_error(...) \
2012 { \
2013 if (warn) \
2014 gfc_warning (__VA_ARGS__); \
2015 else \
2016 { \
2017 gfc_error (__VA_ARGS__); \
2018 goto cleanup; \
2019 } \
2020 }
2021
2022 /* Checks on the RECL specifier. */
2023 if (open->recl && open->recl->expr_type == EXPR_CONSTANT
2024 && open->recl->ts.type == BT_INTEGER
2025 && mpz_sgn (open->recl->value.integer) != 1)
2026 {
2027 warn_or_error ("RECL in OPEN statement at %C must be positive");
2028 }
2029
2030 /* Checks on the STATUS specifier. */
2031 if (open->status && open->status->expr_type == EXPR_CONSTANT)
2032 {
2033 static const char *status[] = { "OLD", "NEW", "SCRATCH",
2034 "REPLACE", "UNKNOWN", NULL };
2035
2036 if (!compare_to_allowed_values ("STATUS", status, NULL, NULL,
2037 open->status->value.character.string,
2038 "OPEN", warn))
2039 goto cleanup;
2040
2041 /* F2003, 9.4.5: If the STATUS= specifier has the value NEW or REPLACE,
2042 the FILE= specifier shall appear. */
2043 if (open->file == NULL
2044 && (gfc_wide_strncasecmp (open->status->value.character.string,
2045 "replace", 7) == 0
2046 || gfc_wide_strncasecmp (open->status->value.character.string,
2047 "new", 3) == 0))
2048 {
2049 char *s = gfc_widechar_to_char (open->status->value.character.string,
2050 -1);
2051 warn_or_error ("The STATUS specified in OPEN statement at %C is "
2052 "'%s' and no FILE specifier is present", s);
2053 gfc_free (s);
2054 }
2055
2056 /* F2003, 9.4.5: If the STATUS= specifier has the value SCRATCH,
2057 the FILE= specifier shall not appear. */
2058 if (gfc_wide_strncasecmp (open->status->value.character.string,
2059 "scratch", 7) == 0 && open->file)
2060 {
2061 warn_or_error ("The STATUS specified in OPEN statement at %C "
2062 "cannot have the value SCRATCH if a FILE specifier "
2063 "is present");
2064 }
2065 }
2066
2067 /* Things that are not allowed for unformatted I/O. */
2068 if (open->form && open->form->expr_type == EXPR_CONSTANT
2069 && (open->delim || open->decimal || open->encoding || open->round
2070 || open->sign || open->pad || open->blank)
2071 && gfc_wide_strncasecmp (open->form->value.character.string,
2072 "unformatted", 11) == 0)
2073 {
2074 const char *spec = (open->delim ? "DELIM "
2075 : (open->pad ? "PAD " : open->blank
2076 ? "BLANK " : ""));
2077
2078 warn_or_error ("%s specifier at %C not allowed in OPEN statement for "
2079 "unformatted I/O", spec);
2080 }
2081
2082 if (open->recl && open->access && open->access->expr_type == EXPR_CONSTANT
2083 && gfc_wide_strncasecmp (open->access->value.character.string,
2084 "stream", 6) == 0)
2085 {
2086 warn_or_error ("RECL specifier not allowed in OPEN statement at %C for "
2087 "stream I/O");
2088 }
2089
2090 if (open->position
2091 && open->access && open->access->expr_type == EXPR_CONSTANT
2092 && !(gfc_wide_strncasecmp (open->access->value.character.string,
2093 "sequential", 10) == 0
2094 || gfc_wide_strncasecmp (open->access->value.character.string,
2095 "stream", 6) == 0
2096 || gfc_wide_strncasecmp (open->access->value.character.string,
2097 "append", 6) == 0))
2098 {
2099 warn_or_error ("POSITION specifier in OPEN statement at %C only allowed "
2100 "for stream or sequential ACCESS");
2101 }
2102
2103 #undef warn_or_error
2104
2105 new_st.op = EXEC_OPEN;
2106 new_st.ext.open = open;
2107 return MATCH_YES;
2108
2109 syntax:
2110 gfc_syntax_error (ST_OPEN);
2111
2112 cleanup:
2113 gfc_free_open (open);
2114 return MATCH_ERROR;
2115 }
2116
2117
2118 /* Free a gfc_close structure an all its expressions. */
2119
2120 void
2121 gfc_free_close (gfc_close *close)
2122 {
2123 if (close == NULL)
2124 return;
2125
2126 gfc_free_expr (close->unit);
2127 gfc_free_expr (close->iomsg);
2128 gfc_free_expr (close->iostat);
2129 gfc_free_expr (close->status);
2130 gfc_free (close);
2131 }
2132
2133
2134 /* Match elements of a CLOSE statement. */
2135
2136 static match
2137 match_close_element (gfc_close *close)
2138 {
2139 match m;
2140
2141 m = match_etag (&tag_unit, &close->unit);
2142 if (m != MATCH_NO)
2143 return m;
2144 m = match_etag (&tag_status, &close->status);
2145 if (m != MATCH_NO)
2146 return m;
2147 m = match_out_tag (&tag_iomsg, &close->iomsg);
2148 if (m != MATCH_NO)
2149 return m;
2150 m = match_out_tag (&tag_iostat, &close->iostat);
2151 if (m != MATCH_NO)
2152 return m;
2153 m = match_ltag (&tag_err, &close->err);
2154 if (m != MATCH_NO)
2155 return m;
2156
2157 return MATCH_NO;
2158 }
2159
2160
2161 /* Match a CLOSE statement. */
2162
2163 match
2164 gfc_match_close (void)
2165 {
2166 gfc_close *close;
2167 match m;
2168 bool warn;
2169
2170 m = gfc_match_char ('(');
2171 if (m == MATCH_NO)
2172 return m;
2173
2174 close = XCNEW (gfc_close);
2175
2176 m = match_close_element (close);
2177
2178 if (m == MATCH_ERROR)
2179 goto cleanup;
2180 if (m == MATCH_NO)
2181 {
2182 m = gfc_match_expr (&close->unit);
2183 if (m == MATCH_NO)
2184 goto syntax;
2185 if (m == MATCH_ERROR)
2186 goto cleanup;
2187 }
2188
2189 for (;;)
2190 {
2191 if (gfc_match_char (')') == MATCH_YES)
2192 break;
2193 if (gfc_match_char (',') != MATCH_YES)
2194 goto syntax;
2195
2196 m = match_close_element (close);
2197 if (m == MATCH_ERROR)
2198 goto cleanup;
2199 if (m == MATCH_NO)
2200 goto syntax;
2201 }
2202
2203 if (gfc_match_eos () == MATCH_NO)
2204 goto syntax;
2205
2206 if (gfc_pure (NULL))
2207 {
2208 gfc_error ("CLOSE statement not allowed in PURE procedure at %C");
2209 goto cleanup;
2210 }
2211
2212 warn = (close->iostat || close->err) ? true : false;
2213
2214 /* Checks on the STATUS specifier. */
2215 if (close->status && close->status->expr_type == EXPR_CONSTANT)
2216 {
2217 static const char *status[] = { "KEEP", "DELETE", NULL };
2218
2219 if (!compare_to_allowed_values ("STATUS", status, NULL, NULL,
2220 close->status->value.character.string,
2221 "CLOSE", warn))
2222 goto cleanup;
2223 }
2224
2225 new_st.op = EXEC_CLOSE;
2226 new_st.ext.close = close;
2227 return MATCH_YES;
2228
2229 syntax:
2230 gfc_syntax_error (ST_CLOSE);
2231
2232 cleanup:
2233 gfc_free_close (close);
2234 return MATCH_ERROR;
2235 }
2236
2237
2238 /* Resolve everything in a gfc_close structure. */
2239
2240 gfc_try
2241 gfc_resolve_close (gfc_close *close)
2242 {
2243 RESOLVE_TAG (&tag_unit, close->unit);
2244 RESOLVE_TAG (&tag_iomsg, close->iomsg);
2245 RESOLVE_TAG (&tag_iostat, close->iostat);
2246 RESOLVE_TAG (&tag_status, close->status);
2247
2248 if (gfc_reference_st_label (close->err, ST_LABEL_TARGET) == FAILURE)
2249 return FAILURE;
2250
2251 if (close->unit->expr_type == EXPR_CONSTANT
2252 && close->unit->ts.type == BT_INTEGER
2253 && mpz_sgn (close->unit->value.integer) < 0)
2254 {
2255 gfc_error ("UNIT number in CLOSE statement at %L must be non-negative",
2256 &close->unit->where);
2257 }
2258
2259 return SUCCESS;
2260 }
2261
2262
2263 /* Free a gfc_filepos structure. */
2264
2265 void
2266 gfc_free_filepos (gfc_filepos *fp)
2267 {
2268 gfc_free_expr (fp->unit);
2269 gfc_free_expr (fp->iomsg);
2270 gfc_free_expr (fp->iostat);
2271 gfc_free (fp);
2272 }
2273
2274
2275 /* Match elements of a REWIND, BACKSPACE, ENDFILE, or FLUSH statement. */
2276
2277 static match
2278 match_file_element (gfc_filepos *fp)
2279 {
2280 match m;
2281
2282 m = match_etag (&tag_unit, &fp->unit);
2283 if (m != MATCH_NO)
2284 return m;
2285 m = match_out_tag (&tag_iomsg, &fp->iomsg);
2286 if (m != MATCH_NO)
2287 return m;
2288 m = match_out_tag (&tag_iostat, &fp->iostat);
2289 if (m != MATCH_NO)
2290 return m;
2291 m = match_ltag (&tag_err, &fp->err);
2292 if (m != MATCH_NO)
2293 return m;
2294
2295 return MATCH_NO;
2296 }
2297
2298
2299 /* Match the second half of the file-positioning statements, REWIND,
2300 BACKSPACE, ENDFILE, or the FLUSH statement. */
2301
2302 static match
2303 match_filepos (gfc_statement st, gfc_exec_op op)
2304 {
2305 gfc_filepos *fp;
2306 match m;
2307
2308 fp = XCNEW (gfc_filepos);
2309
2310 if (gfc_match_char ('(') == MATCH_NO)
2311 {
2312 m = gfc_match_expr (&fp->unit);
2313 if (m == MATCH_ERROR)
2314 goto cleanup;
2315 if (m == MATCH_NO)
2316 goto syntax;
2317
2318 goto done;
2319 }
2320
2321 m = match_file_element (fp);
2322 if (m == MATCH_ERROR)
2323 goto done;
2324 if (m == MATCH_NO)
2325 {
2326 m = gfc_match_expr (&fp->unit);
2327 if (m == MATCH_ERROR)
2328 goto done;
2329 if (m == MATCH_NO)
2330 goto syntax;
2331 }
2332
2333 for (;;)
2334 {
2335 if (gfc_match_char (')') == MATCH_YES)
2336 break;
2337 if (gfc_match_char (',') != MATCH_YES)
2338 goto syntax;
2339
2340 m = match_file_element (fp);
2341 if (m == MATCH_ERROR)
2342 goto cleanup;
2343 if (m == MATCH_NO)
2344 goto syntax;
2345 }
2346
2347 done:
2348 if (gfc_match_eos () != MATCH_YES)
2349 goto syntax;
2350
2351 if (gfc_pure (NULL))
2352 {
2353 gfc_error ("%s statement not allowed in PURE procedure at %C",
2354 gfc_ascii_statement (st));
2355
2356 goto cleanup;
2357 }
2358
2359 new_st.op = op;
2360 new_st.ext.filepos = fp;
2361 return MATCH_YES;
2362
2363 syntax:
2364 gfc_syntax_error (st);
2365
2366 cleanup:
2367 gfc_free_filepos (fp);
2368 return MATCH_ERROR;
2369 }
2370
2371
2372 gfc_try
2373 gfc_resolve_filepos (gfc_filepos *fp)
2374 {
2375 RESOLVE_TAG (&tag_unit, fp->unit);
2376 RESOLVE_TAG (&tag_iostat, fp->iostat);
2377 RESOLVE_TAG (&tag_iomsg, fp->iomsg);
2378 if (gfc_reference_st_label (fp->err, ST_LABEL_TARGET) == FAILURE)
2379 return FAILURE;
2380
2381 if (fp->unit->expr_type == EXPR_CONSTANT
2382 && fp->unit->ts.type == BT_INTEGER
2383 && mpz_sgn (fp->unit->value.integer) < 0)
2384 {
2385 gfc_error ("UNIT number in statement at %L must be non-negative",
2386 &fp->unit->where);
2387 }
2388
2389 return SUCCESS;
2390 }
2391
2392
2393 /* Match the file positioning statements: ENDFILE, BACKSPACE, REWIND,
2394 and the FLUSH statement. */
2395
2396 match
2397 gfc_match_endfile (void)
2398 {
2399 return match_filepos (ST_END_FILE, EXEC_ENDFILE);
2400 }
2401
2402 match
2403 gfc_match_backspace (void)
2404 {
2405 return match_filepos (ST_BACKSPACE, EXEC_BACKSPACE);
2406 }
2407
2408 match
2409 gfc_match_rewind (void)
2410 {
2411 return match_filepos (ST_REWIND, EXEC_REWIND);
2412 }
2413
2414 match
2415 gfc_match_flush (void)
2416 {
2417 if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: FLUSH statement at %C")
2418 == FAILURE)
2419 return MATCH_ERROR;
2420
2421 return match_filepos (ST_FLUSH, EXEC_FLUSH);
2422 }
2423
2424 /******************** Data Transfer Statements *********************/
2425
2426 /* Return a default unit number. */
2427
2428 static gfc_expr *
2429 default_unit (io_kind k)
2430 {
2431 int unit;
2432
2433 if (k == M_READ)
2434 unit = 5;
2435 else
2436 unit = 6;
2437
2438 return gfc_get_int_expr (gfc_default_integer_kind, NULL, unit);
2439 }
2440
2441
2442 /* Match a unit specification for a data transfer statement. */
2443
2444 static match
2445 match_dt_unit (io_kind k, gfc_dt *dt)
2446 {
2447 gfc_expr *e;
2448
2449 if (gfc_match_char ('*') == MATCH_YES)
2450 {
2451 if (dt->io_unit != NULL)
2452 goto conflict;
2453
2454 dt->io_unit = default_unit (k);
2455 return MATCH_YES;
2456 }
2457
2458 if (gfc_match_expr (&e) == MATCH_YES)
2459 {
2460 if (dt->io_unit != NULL)
2461 {
2462 gfc_free_expr (e);
2463 goto conflict;
2464 }
2465
2466 dt->io_unit = e;
2467 return MATCH_YES;
2468 }
2469
2470 return MATCH_NO;
2471
2472 conflict:
2473 gfc_error ("Duplicate UNIT specification at %C");
2474 return MATCH_ERROR;
2475 }
2476
2477
2478 /* Match a format specification. */
2479
2480 static match
2481 match_dt_format (gfc_dt *dt)
2482 {
2483 locus where;
2484 gfc_expr *e;
2485 gfc_st_label *label;
2486 match m;
2487
2488 where = gfc_current_locus;
2489
2490 if (gfc_match_char ('*') == MATCH_YES)
2491 {
2492 if (dt->format_expr != NULL || dt->format_label != NULL)
2493 goto conflict;
2494
2495 dt->format_label = &format_asterisk;
2496 return MATCH_YES;
2497 }
2498
2499 if ((m = gfc_match_st_label (&label)) == MATCH_YES)
2500 {
2501 if (dt->format_expr != NULL || dt->format_label != NULL)
2502 {
2503 gfc_free_st_label (label);
2504 goto conflict;
2505 }
2506
2507 if (gfc_reference_st_label (label, ST_LABEL_FORMAT) == FAILURE)
2508 return MATCH_ERROR;
2509
2510 dt->format_label = label;
2511 return MATCH_YES;
2512 }
2513 else if (m == MATCH_ERROR)
2514 /* The label was zero or too large. Emit the correct diagnosis. */
2515 return MATCH_ERROR;
2516
2517 if (gfc_match_expr (&e) == MATCH_YES)
2518 {
2519 if (dt->format_expr != NULL || dt->format_label != NULL)
2520 {
2521 gfc_free_expr (e);
2522 goto conflict;
2523 }
2524 dt->format_expr = e;
2525 return MATCH_YES;
2526 }
2527
2528 gfc_current_locus = where; /* The only case where we have to restore */
2529
2530 return MATCH_NO;
2531
2532 conflict:
2533 gfc_error ("Duplicate format specification at %C");
2534 return MATCH_ERROR;
2535 }
2536
2537
2538 /* Traverse a namelist that is part of a READ statement to make sure
2539 that none of the variables in the namelist are INTENT(IN). Returns
2540 nonzero if we find such a variable. */
2541
2542 static int
2543 check_namelist (gfc_symbol *sym)
2544 {
2545 gfc_namelist *p;
2546
2547 for (p = sym->namelist; p; p = p->next)
2548 if (p->sym->attr.intent == INTENT_IN)
2549 {
2550 gfc_error ("Symbol '%s' in namelist '%s' is INTENT(IN) at %C",
2551 p->sym->name, sym->name);
2552 return 1;
2553 }
2554
2555 return 0;
2556 }
2557
2558
2559 /* Match a single data transfer element. */
2560
2561 static match
2562 match_dt_element (io_kind k, gfc_dt *dt)
2563 {
2564 char name[GFC_MAX_SYMBOL_LEN + 1];
2565 gfc_symbol *sym;
2566 match m;
2567
2568 if (gfc_match (" unit =") == MATCH_YES)
2569 {
2570 m = match_dt_unit (k, dt);
2571 if (m != MATCH_NO)
2572 return m;
2573 }
2574
2575 if (gfc_match (" fmt =") == MATCH_YES)
2576 {
2577 m = match_dt_format (dt);
2578 if (m != MATCH_NO)
2579 return m;
2580 }
2581
2582 if (gfc_match (" nml = %n", name) == MATCH_YES)
2583 {
2584 if (dt->namelist != NULL)
2585 {
2586 gfc_error ("Duplicate NML specification at %C");
2587 return MATCH_ERROR;
2588 }
2589
2590 if (gfc_find_symbol (name, NULL, 1, &sym))
2591 return MATCH_ERROR;
2592
2593 if (sym == NULL || sym->attr.flavor != FL_NAMELIST)
2594 {
2595 gfc_error ("Symbol '%s' at %C must be a NAMELIST group name",
2596 sym != NULL ? sym->name : name);
2597 return MATCH_ERROR;
2598 }
2599
2600 dt->namelist = sym;
2601 if (k == M_READ && check_namelist (sym))
2602 return MATCH_ERROR;
2603
2604 return MATCH_YES;
2605 }
2606
2607 m = match_etag (&tag_e_async, &dt->asynchronous);
2608 if (m != MATCH_NO)
2609 return m;
2610 m = match_etag (&tag_e_blank, &dt->blank);
2611 if (m != MATCH_NO)
2612 return m;
2613 m = match_etag (&tag_e_delim, &dt->delim);
2614 if (m != MATCH_NO)
2615 return m;
2616 m = match_etag (&tag_e_pad, &dt->pad);
2617 if (m != MATCH_NO)
2618 return m;
2619 m = match_etag (&tag_e_sign, &dt->sign);
2620 if (m != MATCH_NO)
2621 return m;
2622 m = match_etag (&tag_e_round, &dt->round);
2623 if (m != MATCH_NO)
2624 return m;
2625 m = match_out_tag (&tag_id, &dt->id);
2626 if (m != MATCH_NO)
2627 return m;
2628 m = match_etag (&tag_e_decimal, &dt->decimal);
2629 if (m != MATCH_NO)
2630 return m;
2631 m = match_etag (&tag_rec, &dt->rec);
2632 if (m != MATCH_NO)
2633 return m;
2634 m = match_etag (&tag_spos, &dt->pos);
2635 if (m != MATCH_NO)
2636 return m;
2637 m = match_out_tag (&tag_iomsg, &dt->iomsg);
2638 if (m != MATCH_NO)
2639 return m;
2640 m = match_out_tag (&tag_iostat, &dt->iostat);
2641 if (m != MATCH_NO)
2642 return m;
2643 m = match_ltag (&tag_err, &dt->err);
2644 if (m == MATCH_YES)
2645 dt->err_where = gfc_current_locus;
2646 if (m != MATCH_NO)
2647 return m;
2648 m = match_etag (&tag_advance, &dt->advance);
2649 if (m != MATCH_NO)
2650 return m;
2651 m = match_out_tag (&tag_size, &dt->size);
2652 if (m != MATCH_NO)
2653 return m;
2654
2655 m = match_ltag (&tag_end, &dt->end);
2656 if (m == MATCH_YES)
2657 {
2658 if (k == M_WRITE)
2659 {
2660 gfc_error ("END tag at %C not allowed in output statement");
2661 return MATCH_ERROR;
2662 }
2663 dt->end_where = gfc_current_locus;
2664 }
2665 if (m != MATCH_NO)
2666 return m;
2667
2668 m = match_ltag (&tag_eor, &dt->eor);
2669 if (m == MATCH_YES)
2670 dt->eor_where = gfc_current_locus;
2671 if (m != MATCH_NO)
2672 return m;
2673
2674 return MATCH_NO;
2675 }
2676
2677
2678 /* Free a data transfer structure and everything below it. */
2679
2680 void
2681 gfc_free_dt (gfc_dt *dt)
2682 {
2683 if (dt == NULL)
2684 return;
2685
2686 gfc_free_expr (dt->io_unit);
2687 gfc_free_expr (dt->format_expr);
2688 gfc_free_expr (dt->rec);
2689 gfc_free_expr (dt->advance);
2690 gfc_free_expr (dt->iomsg);
2691 gfc_free_expr (dt->iostat);
2692 gfc_free_expr (dt->size);
2693 gfc_free_expr (dt->pad);
2694 gfc_free_expr (dt->delim);
2695 gfc_free_expr (dt->sign);
2696 gfc_free_expr (dt->round);
2697 gfc_free_expr (dt->blank);
2698 gfc_free_expr (dt->decimal);
2699 gfc_free_expr (dt->extra_comma);
2700 gfc_free_expr (dt->pos);
2701 gfc_free (dt);
2702 }
2703
2704
2705 /* Resolve everything in a gfc_dt structure. */
2706
2707 gfc_try
2708 gfc_resolve_dt (gfc_dt *dt, locus *loc)
2709 {
2710 gfc_expr *e;
2711
2712 RESOLVE_TAG (&tag_format, dt->format_expr);
2713 RESOLVE_TAG (&tag_rec, dt->rec);
2714 RESOLVE_TAG (&tag_spos, dt->pos);
2715 RESOLVE_TAG (&tag_advance, dt->advance);
2716 RESOLVE_TAG (&tag_id, dt->id);
2717 RESOLVE_TAG (&tag_iomsg, dt->iomsg);
2718 RESOLVE_TAG (&tag_iostat, dt->iostat);
2719 RESOLVE_TAG (&tag_size, dt->size);
2720 RESOLVE_TAG (&tag_e_pad, dt->pad);
2721 RESOLVE_TAG (&tag_e_delim, dt->delim);
2722 RESOLVE_TAG (&tag_e_sign, dt->sign);
2723 RESOLVE_TAG (&tag_e_round, dt->round);
2724 RESOLVE_TAG (&tag_e_blank, dt->blank);
2725 RESOLVE_TAG (&tag_e_decimal, dt->decimal);
2726 RESOLVE_TAG (&tag_e_async, dt->asynchronous);
2727
2728 e = dt->io_unit;
2729 if (e == NULL)
2730 {
2731 gfc_error ("UNIT not specified at %L", loc);
2732 return FAILURE;
2733 }
2734
2735 if (gfc_resolve_expr (e) == SUCCESS
2736 && (e->ts.type != BT_INTEGER
2737 && (e->ts.type != BT_CHARACTER || e->expr_type != EXPR_VARIABLE)))
2738 {
2739 /* If there is no extra comma signifying the "format" form of the IO
2740 statement, then this must be an error. */
2741 if (!dt->extra_comma)
2742 {
2743 gfc_error ("UNIT specification at %L must be an INTEGER expression "
2744 "or a CHARACTER variable", &e->where);
2745 return FAILURE;
2746 }
2747 else
2748 {
2749 /* At this point, we have an extra comma. If io_unit has arrived as
2750 type character, we assume its really the "format" form of the I/O
2751 statement. We set the io_unit to the default unit and format to
2752 the character expression. See F95 Standard section 9.4. */
2753 io_kind k;
2754 k = dt->extra_comma->value.iokind;
2755 if (e->ts.type == BT_CHARACTER && (k == M_READ || k == M_PRINT))
2756 {
2757 dt->format_expr = dt->io_unit;
2758 dt->io_unit = default_unit (k);
2759
2760 /* Free this pointer now so that a warning/error is not triggered
2761 below for the "Extension". */
2762 gfc_free_expr (dt->extra_comma);
2763 dt->extra_comma = NULL;
2764 }
2765
2766 if (k == M_WRITE)
2767 {
2768 gfc_error ("Invalid form of WRITE statement at %L, UNIT required",
2769 &dt->extra_comma->where);
2770 return FAILURE;
2771 }
2772 }
2773 }
2774
2775 if (e->ts.type == BT_CHARACTER)
2776 {
2777 if (gfc_has_vector_index (e))
2778 {
2779 gfc_error ("Internal unit with vector subscript at %L", &e->where);
2780 return FAILURE;
2781 }
2782 }
2783
2784 if (e->rank && e->ts.type != BT_CHARACTER)
2785 {
2786 gfc_error ("External IO UNIT cannot be an array at %L", &e->where);
2787 return FAILURE;
2788 }
2789
2790 if (e->expr_type == EXPR_CONSTANT && e->ts.type == BT_INTEGER
2791 && mpz_sgn (e->value.integer) < 0)
2792 {
2793 gfc_error ("UNIT number in statement at %L must be non-negative", &e->where);
2794 return FAILURE;
2795 }
2796
2797 if (dt->extra_comma
2798 && gfc_notify_std (GFC_STD_GNU, "Extension: Comma before i/o "
2799 "item list at %L", &dt->extra_comma->where) == FAILURE)
2800 return FAILURE;
2801
2802 if (dt->err)
2803 {
2804 if (gfc_reference_st_label (dt->err, ST_LABEL_TARGET) == FAILURE)
2805 return FAILURE;
2806 if (dt->err->defined == ST_LABEL_UNKNOWN)
2807 {
2808 gfc_error ("ERR tag label %d at %L not defined",
2809 dt->err->value, &dt->err_where);
2810 return FAILURE;
2811 }
2812 }
2813
2814 if (dt->end)
2815 {
2816 if (gfc_reference_st_label (dt->end, ST_LABEL_TARGET) == FAILURE)
2817 return FAILURE;
2818 if (dt->end->defined == ST_LABEL_UNKNOWN)
2819 {
2820 gfc_error ("END tag label %d at %L not defined",
2821 dt->end->value, &dt->end_where);
2822 return FAILURE;
2823 }
2824 }
2825
2826 if (dt->eor)
2827 {
2828 if (gfc_reference_st_label (dt->eor, ST_LABEL_TARGET) == FAILURE)
2829 return FAILURE;
2830 if (dt->eor->defined == ST_LABEL_UNKNOWN)
2831 {
2832 gfc_error ("EOR tag label %d at %L not defined",
2833 dt->eor->value, &dt->eor_where);
2834 return FAILURE;
2835 }
2836 }
2837
2838 /* Check the format label actually exists. */
2839 if (dt->format_label && dt->format_label != &format_asterisk
2840 && dt->format_label->defined == ST_LABEL_UNKNOWN)
2841 {
2842 gfc_error ("FORMAT label %d at %L not defined", dt->format_label->value,
2843 &dt->format_label->where);
2844 return FAILURE;
2845 }
2846 return SUCCESS;
2847 }
2848
2849
2850 /* Given an io_kind, return its name. */
2851
2852 static const char *
2853 io_kind_name (io_kind k)
2854 {
2855 const char *name;
2856
2857 switch (k)
2858 {
2859 case M_READ:
2860 name = "READ";
2861 break;
2862 case M_WRITE:
2863 name = "WRITE";
2864 break;
2865 case M_PRINT:
2866 name = "PRINT";
2867 break;
2868 case M_INQUIRE:
2869 name = "INQUIRE";
2870 break;
2871 default:
2872 gfc_internal_error ("io_kind_name(): bad I/O-kind");
2873 }
2874
2875 return name;
2876 }
2877
2878
2879 /* Match an IO iteration statement of the form:
2880
2881 ( [<IO element> ,] <IO element>, I = <expr>, <expr> [, <expr> ] )
2882
2883 which is equivalent to a single IO element. This function is
2884 mutually recursive with match_io_element(). */
2885
2886 static match match_io_element (io_kind, gfc_code **);
2887
2888 static match
2889 match_io_iterator (io_kind k, gfc_code **result)
2890 {
2891 gfc_code *head, *tail, *new_code;
2892 gfc_iterator *iter;
2893 locus old_loc;
2894 match m;
2895 int n;
2896
2897 iter = NULL;
2898 head = NULL;
2899 old_loc = gfc_current_locus;
2900
2901 if (gfc_match_char ('(') != MATCH_YES)
2902 return MATCH_NO;
2903
2904 m = match_io_element (k, &head);
2905 tail = head;
2906
2907 if (m != MATCH_YES || gfc_match_char (',') != MATCH_YES)
2908 {
2909 m = MATCH_NO;
2910 goto cleanup;
2911 }
2912
2913 /* Can't be anything but an IO iterator. Build a list. */
2914 iter = gfc_get_iterator ();
2915
2916 for (n = 1;; n++)
2917 {
2918 m = gfc_match_iterator (iter, 0);
2919 if (m == MATCH_ERROR)
2920 goto cleanup;
2921 if (m == MATCH_YES)
2922 {
2923 gfc_check_do_variable (iter->var->symtree);
2924 break;
2925 }
2926
2927 m = match_io_element (k, &new_code);
2928 if (m == MATCH_ERROR)
2929 goto cleanup;
2930 if (m == MATCH_NO)
2931 {
2932 if (n > 2)
2933 goto syntax;
2934 goto cleanup;
2935 }
2936
2937 tail = gfc_append_code (tail, new_code);
2938
2939 if (gfc_match_char (',') != MATCH_YES)
2940 {
2941 if (n > 2)
2942 goto syntax;
2943 m = MATCH_NO;
2944 goto cleanup;
2945 }
2946 }
2947
2948 if (gfc_match_char (')') != MATCH_YES)
2949 goto syntax;
2950
2951 new_code = gfc_get_code ();
2952 new_code->op = EXEC_DO;
2953 new_code->ext.iterator = iter;
2954
2955 new_code->block = gfc_get_code ();
2956 new_code->block->op = EXEC_DO;
2957 new_code->block->next = head;
2958
2959 *result = new_code;
2960 return MATCH_YES;
2961
2962 syntax:
2963 gfc_error ("Syntax error in I/O iterator at %C");
2964 m = MATCH_ERROR;
2965
2966 cleanup:
2967 gfc_free_iterator (iter, 1);
2968 gfc_free_statements (head);
2969 gfc_current_locus = old_loc;
2970 return m;
2971 }
2972
2973
2974 /* Match a single element of an IO list, which is either a single
2975 expression or an IO Iterator. */
2976
2977 static match
2978 match_io_element (io_kind k, gfc_code **cpp)
2979 {
2980 gfc_expr *expr;
2981 gfc_code *cp;
2982 match m;
2983
2984 expr = NULL;
2985
2986 m = match_io_iterator (k, cpp);
2987 if (m == MATCH_YES)
2988 return MATCH_YES;
2989
2990 if (k == M_READ)
2991 {
2992 m = gfc_match_variable (&expr, 0);
2993 if (m == MATCH_NO)
2994 gfc_error ("Expected variable in READ statement at %C");
2995 }
2996 else
2997 {
2998 m = gfc_match_expr (&expr);
2999 if (m == MATCH_NO)
3000 gfc_error ("Expected expression in %s statement at %C",
3001 io_kind_name (k));
3002 }
3003
3004 if (m == MATCH_YES)
3005 switch (k)
3006 {
3007 case M_READ:
3008 if (expr->symtree->n.sym->attr.intent == INTENT_IN)
3009 {
3010 gfc_error ("Variable '%s' in input list at %C cannot be "
3011 "INTENT(IN)", expr->symtree->n.sym->name);
3012 m = MATCH_ERROR;
3013 }
3014
3015 if (gfc_pure (NULL)
3016 && gfc_impure_variable (expr->symtree->n.sym)
3017 && current_dt->io_unit
3018 && current_dt->io_unit->ts.type == BT_CHARACTER)
3019 {
3020 gfc_error ("Cannot read to variable '%s' in PURE procedure at %C",
3021 expr->symtree->n.sym->name);
3022 m = MATCH_ERROR;
3023 }
3024
3025 if (gfc_check_do_variable (expr->symtree))
3026 m = MATCH_ERROR;
3027
3028 break;
3029
3030 case M_WRITE:
3031 if (current_dt->io_unit
3032 && current_dt->io_unit->ts.type == BT_CHARACTER
3033 && gfc_pure (NULL)
3034 && current_dt->io_unit->expr_type == EXPR_VARIABLE
3035 && gfc_impure_variable (current_dt->io_unit->symtree->n.sym))
3036 {
3037 gfc_error ("Cannot write to internal file unit '%s' at %C "
3038 "inside a PURE procedure",
3039 current_dt->io_unit->symtree->n.sym->name);
3040 m = MATCH_ERROR;
3041 }
3042
3043 break;
3044
3045 default:
3046 break;
3047 }
3048
3049 if (m != MATCH_YES)
3050 {
3051 gfc_free_expr (expr);
3052 return MATCH_ERROR;
3053 }
3054
3055 cp = gfc_get_code ();
3056 cp->op = EXEC_TRANSFER;
3057 cp->expr1 = expr;
3058
3059 *cpp = cp;
3060 return MATCH_YES;
3061 }
3062
3063
3064 /* Match an I/O list, building gfc_code structures as we go. */
3065
3066 static match
3067 match_io_list (io_kind k, gfc_code **head_p)
3068 {
3069 gfc_code *head, *tail, *new_code;
3070 match m;
3071
3072 *head_p = head = tail = NULL;
3073 if (gfc_match_eos () == MATCH_YES)
3074 return MATCH_YES;
3075
3076 for (;;)
3077 {
3078 m = match_io_element (k, &new_code);
3079 if (m == MATCH_ERROR)
3080 goto cleanup;
3081 if (m == MATCH_NO)
3082 goto syntax;
3083
3084 tail = gfc_append_code (tail, new_code);
3085 if (head == NULL)
3086 head = new_code;
3087
3088 if (gfc_match_eos () == MATCH_YES)
3089 break;
3090 if (gfc_match_char (',') != MATCH_YES)
3091 goto syntax;
3092 }
3093
3094 *head_p = head;
3095 return MATCH_YES;
3096
3097 syntax:
3098 gfc_error ("Syntax error in %s statement at %C", io_kind_name (k));
3099
3100 cleanup:
3101 gfc_free_statements (head);
3102 return MATCH_ERROR;
3103 }
3104
3105
3106 /* Attach the data transfer end node. */
3107
3108 static void
3109 terminate_io (gfc_code *io_code)
3110 {
3111 gfc_code *c;
3112
3113 if (io_code == NULL)
3114 io_code = new_st.block;
3115
3116 c = gfc_get_code ();
3117 c->op = EXEC_DT_END;
3118
3119 /* Point to structure that is already there */
3120 c->ext.dt = new_st.ext.dt;
3121 gfc_append_code (io_code, c);
3122 }
3123
3124
3125 /* Check the constraints for a data transfer statement. The majority of the
3126 constraints appearing in 9.4 of the standard appear here. Some are handled
3127 in resolve_tag and others in gfc_resolve_dt. */
3128
3129 static match
3130 check_io_constraints (io_kind k, gfc_dt *dt, gfc_code *io_code,
3131 locus *spec_end)
3132 {
3133 #define io_constraint(condition,msg,arg)\
3134 if (condition) \
3135 {\
3136 gfc_error(msg,arg);\
3137 m = MATCH_ERROR;\
3138 }
3139
3140 match m;
3141 gfc_expr *expr;
3142 gfc_symbol *sym = NULL;
3143 bool warn, unformatted;
3144
3145 warn = (dt->err || dt->iostat) ? true : false;
3146 unformatted = dt->format_expr == NULL && dt->format_label == NULL
3147 && dt->namelist == NULL;
3148
3149 m = MATCH_YES;
3150
3151 expr = dt->io_unit;
3152 if (expr && expr->expr_type == EXPR_VARIABLE
3153 && expr->ts.type == BT_CHARACTER)
3154 {
3155 sym = expr->symtree->n.sym;
3156
3157 io_constraint (k == M_WRITE && sym->attr.intent == INTENT_IN,
3158 "Internal file at %L must not be INTENT(IN)",
3159 &expr->where);
3160
3161 io_constraint (gfc_has_vector_index (dt->io_unit),
3162 "Internal file incompatible with vector subscript at %L",
3163 &expr->where);
3164
3165 io_constraint (dt->rec != NULL,
3166 "REC tag at %L is incompatible with internal file",
3167 &dt->rec->where);
3168
3169 io_constraint (dt->pos != NULL,
3170 "POS tag at %L is incompatible with internal file",
3171 &dt->pos->where);
3172
3173 io_constraint (unformatted,
3174 "Unformatted I/O not allowed with internal unit at %L",
3175 &dt->io_unit->where);
3176
3177 io_constraint (dt->asynchronous != NULL,
3178 "ASYNCHRONOUS tag at %L not allowed with internal file",
3179 &dt->asynchronous->where);
3180
3181 if (dt->namelist != NULL)
3182 {
3183 if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: Internal file "
3184 "at %L with namelist", &expr->where)
3185 == FAILURE)
3186 m = MATCH_ERROR;
3187 }
3188
3189 io_constraint (dt->advance != NULL,
3190 "ADVANCE tag at %L is incompatible with internal file",
3191 &dt->advance->where);
3192 }
3193
3194 if (expr && expr->ts.type != BT_CHARACTER)
3195 {
3196
3197 io_constraint (gfc_pure (NULL) && (k == M_READ || k == M_WRITE),
3198 "IO UNIT in %s statement at %C must be "
3199 "an internal file in a PURE procedure",
3200 io_kind_name (k));
3201 }
3202
3203 if (k != M_READ)
3204 {
3205 io_constraint (dt->end, "END tag not allowed with output at %L",
3206 &dt->end_where);
3207
3208 io_constraint (dt->eor, "EOR tag not allowed with output at %L",
3209 &dt->eor_where);
3210
3211 io_constraint (dt->blank, "BLANK= specifier not allowed with output at %L",
3212 &dt->blank->where);
3213
3214 io_constraint (dt->pad, "PAD= specifier not allowed with output at %L",
3215 &dt->pad->where);
3216
3217 io_constraint (dt->size, "SIZE= specifier not allowed with output at %L",
3218 &dt->size->where);
3219 }
3220 else
3221 {
3222 io_constraint (dt->size && dt->advance == NULL,
3223 "SIZE tag at %L requires an ADVANCE tag",
3224 &dt->size->where);
3225
3226 io_constraint (dt->eor && dt->advance == NULL,
3227 "EOR tag at %L requires an ADVANCE tag",
3228 &dt->eor_where);
3229 }
3230
3231 if (dt->asynchronous)
3232 {
3233 static const char * asynchronous[] = { "YES", "NO", NULL };
3234
3235 if (gfc_reduce_init_expr (dt->asynchronous) != SUCCESS)
3236 {
3237 gfc_error ("ASYNCHRONOUS= specifier at %L must be an initialization "
3238 "expression", &dt->asynchronous->where);
3239 return MATCH_ERROR;
3240 }
3241
3242 if (!compare_to_allowed_values
3243 ("ASYNCHRONOUS", asynchronous, NULL, NULL,
3244 dt->asynchronous->value.character.string,
3245 io_kind_name (k), warn))
3246 return MATCH_ERROR;
3247 }
3248
3249 if (dt->id)
3250 {
3251 bool not_yes
3252 = !dt->asynchronous
3253 || gfc_wide_strlen (dt->asynchronous->value.character.string) != 3
3254 || gfc_wide_strncasecmp (dt->asynchronous->value.character.string,
3255 "yes", 3) != 0;
3256 io_constraint (not_yes,
3257 "ID= specifier at %L must be with ASYNCHRONOUS='yes' "
3258 "specifier", &dt->id->where);
3259 }
3260
3261 if (dt->decimal)
3262 {
3263 if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: DECIMAL= at %C "
3264 "not allowed in Fortran 95") == FAILURE)
3265 return MATCH_ERROR;
3266
3267 if (dt->decimal->expr_type == EXPR_CONSTANT)
3268 {
3269 static const char * decimal[] = { "COMMA", "POINT", NULL };
3270
3271 if (!compare_to_allowed_values ("DECIMAL", decimal, NULL, NULL,
3272 dt->decimal->value.character.string,
3273 io_kind_name (k), warn))
3274 return MATCH_ERROR;
3275
3276 io_constraint (unformatted,
3277 "the DECIMAL= specifier at %L must be with an "
3278 "explicit format expression", &dt->decimal->where);
3279 }
3280 }
3281
3282 if (dt->blank)
3283 {
3284 if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: BLANK= at %C "
3285 "not allowed in Fortran 95") == FAILURE)
3286 return MATCH_ERROR;
3287
3288 if (dt->blank->expr_type == EXPR_CONSTANT)
3289 {
3290 static const char * blank[] = { "NULL", "ZERO", NULL };
3291
3292 if (!compare_to_allowed_values ("BLANK", blank, NULL, NULL,
3293 dt->blank->value.character.string,
3294 io_kind_name (k), warn))
3295 return MATCH_ERROR;
3296
3297 io_constraint (unformatted,
3298 "the BLANK= specifier at %L must be with an "
3299 "explicit format expression", &dt->blank->where);
3300 }
3301 }
3302
3303 if (dt->pad)
3304 {
3305 if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: PAD= at %C "
3306 "not allowed in Fortran 95") == FAILURE)
3307 return MATCH_ERROR;
3308
3309 if (dt->pad->expr_type == EXPR_CONSTANT)
3310 {
3311 static const char * pad[] = { "YES", "NO", NULL };
3312
3313 if (!compare_to_allowed_values ("PAD", pad, NULL, NULL,
3314 dt->pad->value.character.string,
3315 io_kind_name (k), warn))
3316 return MATCH_ERROR;
3317
3318 io_constraint (unformatted,
3319 "the PAD= specifier at %L must be with an "
3320 "explicit format expression", &dt->pad->where);
3321 }
3322 }
3323
3324 if (dt->round)
3325 {
3326 if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: ROUND= at %C "
3327 "not allowed in Fortran 95") == FAILURE)
3328 return MATCH_ERROR;
3329
3330 if (dt->round->expr_type == EXPR_CONSTANT)
3331 {
3332 static const char * round[] = { "UP", "DOWN", "ZERO", "NEAREST",
3333 "COMPATIBLE", "PROCESSOR_DEFINED",
3334 NULL };
3335
3336 if (!compare_to_allowed_values ("ROUND", round, NULL, NULL,
3337 dt->round->value.character.string,
3338 io_kind_name (k), warn))
3339 return MATCH_ERROR;
3340 }
3341 }
3342
3343 if (dt->sign)
3344 {
3345 /* When implemented, change the following to use gfc_notify_std F2003.
3346 if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: SIGN= at %C "
3347 "not allowed in Fortran 95") == FAILURE)
3348 return MATCH_ERROR; */
3349 if (dt->sign->expr_type == EXPR_CONSTANT)
3350 {
3351 static const char * sign[] = { "PLUS", "SUPPRESS", "PROCESSOR_DEFINED",
3352 NULL };
3353
3354 if (!compare_to_allowed_values ("SIGN", sign, NULL, NULL,
3355 dt->sign->value.character.string,
3356 io_kind_name (k), warn))
3357 return MATCH_ERROR;
3358
3359 io_constraint (unformatted,
3360 "SIGN= specifier at %L must be with an "
3361 "explicit format expression", &dt->sign->where);
3362
3363 io_constraint (k == M_READ,
3364 "SIGN= specifier at %L not allowed in a "
3365 "READ statement", &dt->sign->where);
3366 }
3367 }
3368
3369 if (dt->delim)
3370 {
3371 if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: DELIM= at %C "
3372 "not allowed in Fortran 95") == FAILURE)
3373 return MATCH_ERROR;
3374
3375 if (dt->delim->expr_type == EXPR_CONSTANT)
3376 {
3377 static const char *delim[] = { "APOSTROPHE", "QUOTE", "NONE", NULL };
3378
3379 if (!compare_to_allowed_values ("DELIM", delim, NULL, NULL,
3380 dt->delim->value.character.string,
3381 io_kind_name (k), warn))
3382 return MATCH_ERROR;
3383
3384 io_constraint (k == M_READ,
3385 "DELIM= specifier at %L not allowed in a "
3386 "READ statement", &dt->delim->where);
3387
3388 io_constraint (dt->format_label != &format_asterisk
3389 && dt->namelist == NULL,
3390 "DELIM= specifier at %L must have FMT=*",
3391 &dt->delim->where);
3392
3393 io_constraint (unformatted && dt->namelist == NULL,
3394 "DELIM= specifier at %L must be with FMT=* or "
3395 "NML= specifier ", &dt->delim->where);
3396 }
3397 }
3398
3399 if (dt->namelist)
3400 {
3401 io_constraint (io_code && dt->namelist,
3402 "NAMELIST cannot be followed by IO-list at %L",
3403 &io_code->loc);
3404
3405 io_constraint (dt->format_expr,
3406 "IO spec-list cannot contain both NAMELIST group name "
3407 "and format specification at %L",
3408 &dt->format_expr->where);
3409
3410 io_constraint (dt->format_label,
3411 "IO spec-list cannot contain both NAMELIST group name "
3412 "and format label at %L", spec_end);
3413
3414 io_constraint (dt->rec,
3415 "NAMELIST IO is not allowed with a REC= specifier "
3416 "at %L", &dt->rec->where);
3417
3418 io_constraint (dt->advance,
3419 "NAMELIST IO is not allowed with a ADVANCE= specifier "
3420 "at %L", &dt->advance->where);
3421 }
3422
3423 if (dt->rec)
3424 {
3425 io_constraint (dt->end,
3426 "An END tag is not allowed with a "
3427 "REC= specifier at %L", &dt->end_where);
3428
3429 io_constraint (dt->format_label == &format_asterisk,
3430 "FMT=* is not allowed with a REC= specifier "
3431 "at %L", spec_end);
3432
3433 io_constraint (dt->pos,
3434 "POS= is not allowed with REC= specifier "
3435 "at %L", &dt->pos->where);
3436 }
3437
3438 if (dt->advance)
3439 {
3440 int not_yes, not_no;
3441 expr = dt->advance;
3442
3443 io_constraint (dt->format_label == &format_asterisk,
3444 "List directed format(*) is not allowed with a "
3445 "ADVANCE= specifier at %L.", &expr->where);
3446
3447 io_constraint (unformatted,
3448 "the ADVANCE= specifier at %L must appear with an "
3449 "explicit format expression", &expr->where);
3450
3451 if (expr->expr_type == EXPR_CONSTANT && expr->ts.type == BT_CHARACTER)
3452 {
3453 const gfc_char_t *advance = expr->value.character.string;
3454 not_no = gfc_wide_strlen (advance) != 2
3455 || gfc_wide_strncasecmp (advance, "no", 2) != 0;
3456 not_yes = gfc_wide_strlen (advance) != 3
3457 || gfc_wide_strncasecmp (advance, "yes", 3) != 0;
3458 }
3459 else
3460 {
3461 not_no = 0;
3462 not_yes = 0;
3463 }
3464
3465 io_constraint (not_no && not_yes,
3466 "ADVANCE= specifier at %L must have value = "
3467 "YES or NO.", &expr->where);
3468
3469 io_constraint (dt->size && not_no && k == M_READ,
3470 "SIZE tag at %L requires an ADVANCE = 'NO'",
3471 &dt->size->where);
3472
3473 io_constraint (dt->eor && not_no && k == M_READ,
3474 "EOR tag at %L requires an ADVANCE = 'NO'",
3475 &dt->eor_where);
3476 }
3477
3478 expr = dt->format_expr;
3479 if (gfc_simplify_expr (expr, 0) == FAILURE
3480 || check_format_string (expr, k == M_READ) == FAILURE)
3481 return MATCH_ERROR;
3482
3483 return m;
3484 }
3485 #undef io_constraint
3486
3487
3488 /* Match a READ, WRITE or PRINT statement. */
3489
3490 static match
3491 match_io (io_kind k)
3492 {
3493 char name[GFC_MAX_SYMBOL_LEN + 1];
3494 gfc_code *io_code;
3495 gfc_symbol *sym;
3496 int comma_flag;
3497 locus where;
3498 locus spec_end;
3499 gfc_dt *dt;
3500 match m;
3501
3502 where = gfc_current_locus;
3503 comma_flag = 0;
3504 current_dt = dt = XCNEW (gfc_dt);
3505 m = gfc_match_char ('(');
3506 if (m == MATCH_NO)
3507 {
3508 where = gfc_current_locus;
3509 if (k == M_WRITE)
3510 goto syntax;
3511 else if (k == M_PRINT)
3512 {
3513 /* Treat the non-standard case of PRINT namelist. */
3514 if ((gfc_current_form == FORM_FIXED || gfc_peek_ascii_char () == ' ')
3515 && gfc_match_name (name) == MATCH_YES)
3516 {
3517 gfc_find_symbol (name, NULL, 1, &sym);
3518 if (sym && sym->attr.flavor == FL_NAMELIST)
3519 {
3520 if (gfc_notify_std (GFC_STD_GNU, "PRINT namelist at "
3521 "%C is an extension") == FAILURE)
3522 {
3523 m = MATCH_ERROR;
3524 goto cleanup;
3525 }
3526
3527 dt->io_unit = default_unit (k);
3528 dt->namelist = sym;
3529 goto get_io_list;
3530 }
3531 else
3532 gfc_current_locus = where;
3533 }
3534 }
3535
3536 if (gfc_current_form == FORM_FREE)
3537 {
3538 char c = gfc_peek_ascii_char ();
3539 if (c != ' ' && c != '*' && c != '\'' && c != '"')
3540 {
3541 m = MATCH_NO;
3542 goto cleanup;
3543 }
3544 }
3545
3546 m = match_dt_format (dt);
3547 if (m == MATCH_ERROR)
3548 goto cleanup;
3549 if (m == MATCH_NO)
3550 goto syntax;
3551
3552 comma_flag = 1;
3553 dt->io_unit = default_unit (k);
3554 goto get_io_list;
3555 }
3556 else
3557 {
3558 /* Before issuing an error for a malformed 'print (1,*)' type of
3559 error, check for a default-char-expr of the form ('(I0)'). */
3560 if (k == M_PRINT && m == MATCH_YES)
3561 {
3562 /* Reset current locus to get the initial '(' in an expression. */
3563 gfc_current_locus = where;
3564 dt->format_expr = NULL;
3565 m = match_dt_format (dt);
3566
3567 if (m == MATCH_ERROR)
3568 goto cleanup;
3569 if (m == MATCH_NO || dt->format_expr == NULL)
3570 goto syntax;
3571
3572 comma_flag = 1;
3573 dt->io_unit = default_unit (k);
3574 goto get_io_list;
3575 }
3576 }
3577
3578 /* Match a control list */
3579 if (match_dt_element (k, dt) == MATCH_YES)
3580 goto next;
3581 if (match_dt_unit (k, dt) != MATCH_YES)
3582 goto loop;
3583
3584 if (gfc_match_char (')') == MATCH_YES)
3585 goto get_io_list;
3586 if (gfc_match_char (',') != MATCH_YES)
3587 goto syntax;
3588
3589 m = match_dt_element (k, dt);
3590 if (m == MATCH_YES)
3591 goto next;
3592 if (m == MATCH_ERROR)
3593 goto cleanup;
3594
3595 m = match_dt_format (dt);
3596 if (m == MATCH_YES)
3597 goto next;
3598 if (m == MATCH_ERROR)
3599 goto cleanup;
3600
3601 where = gfc_current_locus;
3602
3603 m = gfc_match_name (name);
3604 if (m == MATCH_YES)
3605 {
3606 gfc_find_symbol (name, NULL, 1, &sym);
3607 if (sym && sym->attr.flavor == FL_NAMELIST)
3608 {
3609 dt->namelist = sym;
3610 if (k == M_READ && check_namelist (sym))
3611 {
3612 m = MATCH_ERROR;
3613 goto cleanup;
3614 }
3615 goto next;
3616 }
3617 }
3618
3619 gfc_current_locus = where;
3620
3621 goto loop; /* No matches, try regular elements */
3622
3623 next:
3624 if (gfc_match_char (')') == MATCH_YES)
3625 goto get_io_list;
3626 if (gfc_match_char (',') != MATCH_YES)
3627 goto syntax;
3628
3629 loop:
3630 for (;;)
3631 {
3632 m = match_dt_element (k, dt);
3633 if (m == MATCH_NO)
3634 goto syntax;
3635 if (m == MATCH_ERROR)
3636 goto cleanup;
3637
3638 if (gfc_match_char (')') == MATCH_YES)
3639 break;
3640 if (gfc_match_char (',') != MATCH_YES)
3641 goto syntax;
3642 }
3643
3644 get_io_list:
3645
3646 /* Used in check_io_constraints, where no locus is available. */
3647 spec_end = gfc_current_locus;
3648
3649 /* Optional leading comma (non-standard). We use a gfc_expr structure here
3650 to save the locus. This is used later when resolving transfer statements
3651 that might have a format expression without unit number. */
3652 if (!comma_flag && gfc_match_char (',') == MATCH_YES)
3653 {
3654 /* Save the iokind and locus for later use in resolution. */
3655 dt->extra_comma = gfc_get_iokind_expr (&gfc_current_locus, k);
3656 }
3657
3658 io_code = NULL;
3659 if (gfc_match_eos () != MATCH_YES)
3660 {
3661 if (comma_flag && gfc_match_char (',') != MATCH_YES)
3662 {
3663 gfc_error ("Expected comma in I/O list at %C");
3664 m = MATCH_ERROR;
3665 goto cleanup;
3666 }
3667
3668 m = match_io_list (k, &io_code);
3669 if (m == MATCH_ERROR)
3670 goto cleanup;
3671 if (m == MATCH_NO)
3672 goto syntax;
3673 }
3674
3675 /* A full IO statement has been matched. Check the constraints. spec_end is
3676 supplied for cases where no locus is supplied. */
3677 m = check_io_constraints (k, dt, io_code, &spec_end);
3678
3679 if (m == MATCH_ERROR)
3680 goto cleanup;
3681
3682 new_st.op = (k == M_READ) ? EXEC_READ : EXEC_WRITE;
3683 new_st.ext.dt = dt;
3684 new_st.block = gfc_get_code ();
3685 new_st.block->op = new_st.op;
3686 new_st.block->next = io_code;
3687
3688 terminate_io (io_code);
3689
3690 return MATCH_YES;
3691
3692 syntax:
3693 gfc_error ("Syntax error in %s statement at %C", io_kind_name (k));
3694 m = MATCH_ERROR;
3695
3696 cleanup:
3697 gfc_free_dt (dt);
3698 return m;
3699 }
3700
3701
3702 match
3703 gfc_match_read (void)
3704 {
3705 return match_io (M_READ);
3706 }
3707
3708
3709 match
3710 gfc_match_write (void)
3711 {
3712 return match_io (M_WRITE);
3713 }
3714
3715
3716 match
3717 gfc_match_print (void)
3718 {
3719 match m;
3720
3721 m = match_io (M_PRINT);
3722 if (m != MATCH_YES)
3723 return m;
3724
3725 if (gfc_pure (NULL))
3726 {
3727 gfc_error ("PRINT statement at %C not allowed within PURE procedure");
3728 return MATCH_ERROR;
3729 }
3730
3731 return MATCH_YES;
3732 }
3733
3734
3735 /* Free a gfc_inquire structure. */
3736
3737 void
3738 gfc_free_inquire (gfc_inquire *inquire)
3739 {
3740
3741 if (inquire == NULL)
3742 return;
3743
3744 gfc_free_expr (inquire->unit);
3745 gfc_free_expr (inquire->file);
3746 gfc_free_expr (inquire->iomsg);
3747 gfc_free_expr (inquire->iostat);
3748 gfc_free_expr (inquire->exist);
3749 gfc_free_expr (inquire->opened);
3750 gfc_free_expr (inquire->number);
3751 gfc_free_expr (inquire->named);
3752 gfc_free_expr (inquire->name);
3753 gfc_free_expr (inquire->access);
3754 gfc_free_expr (inquire->sequential);
3755 gfc_free_expr (inquire->direct);
3756 gfc_free_expr (inquire->form);
3757 gfc_free_expr (inquire->formatted);
3758 gfc_free_expr (inquire->unformatted);
3759 gfc_free_expr (inquire->recl);
3760 gfc_free_expr (inquire->nextrec);
3761 gfc_free_expr (inquire->blank);
3762 gfc_free_expr (inquire->position);
3763 gfc_free_expr (inquire->action);
3764 gfc_free_expr (inquire->read);
3765 gfc_free_expr (inquire->write);
3766 gfc_free_expr (inquire->readwrite);
3767 gfc_free_expr (inquire->delim);
3768 gfc_free_expr (inquire->encoding);
3769 gfc_free_expr (inquire->pad);
3770 gfc_free_expr (inquire->iolength);
3771 gfc_free_expr (inquire->convert);
3772 gfc_free_expr (inquire->strm_pos);
3773 gfc_free_expr (inquire->asynchronous);
3774 gfc_free_expr (inquire->decimal);
3775 gfc_free_expr (inquire->pending);
3776 gfc_free_expr (inquire->id);
3777 gfc_free_expr (inquire->sign);
3778 gfc_free_expr (inquire->size);
3779 gfc_free_expr (inquire->round);
3780 gfc_free (inquire);
3781 }
3782
3783
3784 /* Match an element of an INQUIRE statement. */
3785
3786 #define RETM if (m != MATCH_NO) return m;
3787
3788 static match
3789 match_inquire_element (gfc_inquire *inquire)
3790 {
3791 match m;
3792
3793 m = match_etag (&tag_unit, &inquire->unit);
3794 RETM m = match_etag (&tag_file, &inquire->file);
3795 RETM m = match_ltag (&tag_err, &inquire->err);
3796 RETM m = match_out_tag (&tag_iomsg, &inquire->iomsg);
3797 RETM m = match_out_tag (&tag_iostat, &inquire->iostat);
3798 RETM m = match_vtag (&tag_exist, &inquire->exist);
3799 RETM m = match_vtag (&tag_opened, &inquire->opened);
3800 RETM m = match_vtag (&tag_named, &inquire->named);
3801 RETM m = match_vtag (&tag_name, &inquire->name);
3802 RETM m = match_out_tag (&tag_number, &inquire->number);
3803 RETM m = match_vtag (&tag_s_access, &inquire->access);
3804 RETM m = match_vtag (&tag_sequential, &inquire->sequential);
3805 RETM m = match_vtag (&tag_direct, &inquire->direct);
3806 RETM m = match_vtag (&tag_s_form, &inquire->form);
3807 RETM m = match_vtag (&tag_formatted, &inquire->formatted);
3808 RETM m = match_vtag (&tag_unformatted, &inquire->unformatted);
3809 RETM m = match_out_tag (&tag_s_recl, &inquire->recl);
3810 RETM m = match_out_tag (&tag_nextrec, &inquire->nextrec);
3811 RETM m = match_vtag (&tag_s_blank, &inquire->blank);
3812 RETM m = match_vtag (&tag_s_position, &inquire->position);
3813 RETM m = match_vtag (&tag_s_action, &inquire->action);
3814 RETM m = match_vtag (&tag_read, &inquire->read);
3815 RETM m = match_vtag (&tag_write, &inquire->write);
3816 RETM m = match_vtag (&tag_readwrite, &inquire->readwrite);
3817 RETM m = match_vtag (&tag_s_async, &inquire->asynchronous);
3818 RETM m = match_vtag (&tag_s_delim, &inquire->delim);
3819 RETM m = match_vtag (&tag_s_decimal, &inquire->decimal);
3820 RETM m = match_vtag (&tag_size, &inquire->size);
3821 RETM m = match_vtag (&tag_s_encoding, &inquire->encoding);
3822 RETM m = match_vtag (&tag_s_round, &inquire->round);
3823 RETM m = match_vtag (&tag_s_sign, &inquire->sign);
3824 RETM m = match_vtag (&tag_s_pad, &inquire->pad);
3825 RETM m = match_vtag (&tag_iolength, &inquire->iolength);
3826 RETM m = match_vtag (&tag_convert, &inquire->convert);
3827 RETM m = match_out_tag (&tag_strm_out, &inquire->strm_pos);
3828 RETM m = match_vtag (&tag_pending, &inquire->pending);
3829 RETM m = match_vtag (&tag_id, &inquire->id);
3830 RETM return MATCH_NO;
3831 }
3832
3833 #undef RETM
3834
3835
3836 match
3837 gfc_match_inquire (void)
3838 {
3839 gfc_inquire *inquire;
3840 gfc_code *code;
3841 match m;
3842 locus loc;
3843
3844 m = gfc_match_char ('(');
3845 if (m == MATCH_NO)
3846 return m;
3847
3848 inquire = XCNEW (gfc_inquire);
3849
3850 loc = gfc_current_locus;
3851
3852 m = match_inquire_element (inquire);
3853 if (m == MATCH_ERROR)
3854 goto cleanup;
3855 if (m == MATCH_NO)
3856 {
3857 m = gfc_match_expr (&inquire->unit);
3858 if (m == MATCH_ERROR)
3859 goto cleanup;
3860 if (m == MATCH_NO)
3861 goto syntax;
3862 }
3863
3864 /* See if we have the IOLENGTH form of the inquire statement. */
3865 if (inquire->iolength != NULL)
3866 {
3867 if (gfc_match_char (')') != MATCH_YES)
3868 goto syntax;
3869
3870 m = match_io_list (M_INQUIRE, &code);
3871 if (m == MATCH_ERROR)
3872 goto cleanup;
3873 if (m == MATCH_NO)
3874 goto syntax;
3875
3876 new_st.op = EXEC_IOLENGTH;
3877 new_st.expr1 = inquire->iolength;
3878 new_st.ext.inquire = inquire;
3879
3880 if (gfc_pure (NULL))
3881 {
3882 gfc_free_statements (code);
3883 gfc_error ("INQUIRE statement not allowed in PURE procedure at %C");
3884 return MATCH_ERROR;
3885 }
3886
3887 new_st.block = gfc_get_code ();
3888 new_st.block->op = EXEC_IOLENGTH;
3889 terminate_io (code);
3890 new_st.block->next = code;
3891 return MATCH_YES;
3892 }
3893
3894 /* At this point, we have the non-IOLENGTH inquire statement. */
3895 for (;;)
3896 {
3897 if (gfc_match_char (')') == MATCH_YES)
3898 break;
3899 if (gfc_match_char (',') != MATCH_YES)
3900 goto syntax;
3901
3902 m = match_inquire_element (inquire);
3903 if (m == MATCH_ERROR)
3904 goto cleanup;
3905 if (m == MATCH_NO)
3906 goto syntax;
3907
3908 if (inquire->iolength != NULL)
3909 {
3910 gfc_error ("IOLENGTH tag invalid in INQUIRE statement at %C");
3911 goto cleanup;
3912 }
3913 }
3914
3915 if (gfc_match_eos () != MATCH_YES)
3916 goto syntax;
3917
3918 if (inquire->unit != NULL && inquire->file != NULL)
3919 {
3920 gfc_error ("INQUIRE statement at %L cannot contain both FILE and "
3921 "UNIT specifiers", &loc);
3922 goto cleanup;
3923 }
3924
3925 if (inquire->unit == NULL && inquire->file == NULL)
3926 {
3927 gfc_error ("INQUIRE statement at %L requires either FILE or "
3928 "UNIT specifier", &loc);
3929 goto cleanup;
3930 }
3931
3932 if (gfc_pure (NULL))
3933 {
3934 gfc_error ("INQUIRE statement not allowed in PURE procedure at %C");
3935 goto cleanup;
3936 }
3937
3938 if (inquire->id != NULL && inquire->pending == NULL)
3939 {
3940 gfc_error ("INQUIRE statement at %L requires a PENDING= specifier with "
3941 "the ID= specifier", &loc);
3942 goto cleanup;
3943 }
3944
3945 new_st.op = EXEC_INQUIRE;
3946 new_st.ext.inquire = inquire;
3947 return MATCH_YES;
3948
3949 syntax:
3950 gfc_syntax_error (ST_INQUIRE);
3951
3952 cleanup:
3953 gfc_free_inquire (inquire);
3954 return MATCH_ERROR;
3955 }
3956
3957
3958 /* Resolve everything in a gfc_inquire structure. */
3959
3960 gfc_try
3961 gfc_resolve_inquire (gfc_inquire *inquire)
3962 {
3963 RESOLVE_TAG (&tag_unit, inquire->unit);
3964 RESOLVE_TAG (&tag_file, inquire->file);
3965 RESOLVE_TAG (&tag_iomsg, inquire->iomsg);
3966 RESOLVE_TAG (&tag_iostat, inquire->iostat);
3967 RESOLVE_TAG (&tag_exist, inquire->exist);
3968 RESOLVE_TAG (&tag_opened, inquire->opened);
3969 RESOLVE_TAG (&tag_number, inquire->number);
3970 RESOLVE_TAG (&tag_named, inquire->named);
3971 RESOLVE_TAG (&tag_name, inquire->name);
3972 RESOLVE_TAG (&tag_s_access, inquire->access);
3973 RESOLVE_TAG (&tag_sequential, inquire->sequential);
3974 RESOLVE_TAG (&tag_direct, inquire->direct);
3975 RESOLVE_TAG (&tag_s_form, inquire->form);
3976 RESOLVE_TAG (&tag_formatted, inquire->formatted);
3977 RESOLVE_TAG (&tag_unformatted, inquire->unformatted);
3978 RESOLVE_TAG (&tag_s_recl, inquire->recl);
3979 RESOLVE_TAG (&tag_nextrec, inquire->nextrec);
3980 RESOLVE_TAG (&tag_s_blank, inquire->blank);
3981 RESOLVE_TAG (&tag_s_position, inquire->position);
3982 RESOLVE_TAG (&tag_s_action, inquire->action);
3983 RESOLVE_TAG (&tag_read, inquire->read);
3984 RESOLVE_TAG (&tag_write, inquire->write);
3985 RESOLVE_TAG (&tag_readwrite, inquire->readwrite);
3986 RESOLVE_TAG (&tag_s_delim, inquire->delim);
3987 RESOLVE_TAG (&tag_s_pad, inquire->pad);
3988 RESOLVE_TAG (&tag_s_encoding, inquire->encoding);
3989 RESOLVE_TAG (&tag_s_round, inquire->round);
3990 RESOLVE_TAG (&tag_iolength, inquire->iolength);
3991 RESOLVE_TAG (&tag_convert, inquire->convert);
3992 RESOLVE_TAG (&tag_strm_out, inquire->strm_pos);
3993 RESOLVE_TAG (&tag_s_async, inquire->asynchronous);
3994 RESOLVE_TAG (&tag_s_sign, inquire->sign);
3995 RESOLVE_TAG (&tag_s_round, inquire->round);
3996 RESOLVE_TAG (&tag_pending, inquire->pending);
3997 RESOLVE_TAG (&tag_size, inquire->size);
3998 RESOLVE_TAG (&tag_id, inquire->id);
3999
4000 if (gfc_reference_st_label (inquire->err, ST_LABEL_TARGET) == FAILURE)
4001 return FAILURE;
4002
4003 return SUCCESS;
4004 }
4005
4006
4007 void
4008 gfc_free_wait (gfc_wait *wait)
4009 {
4010 if (wait == NULL)
4011 return;
4012
4013 gfc_free_expr (wait->unit);
4014 gfc_free_expr (wait->iostat);
4015 gfc_free_expr (wait->iomsg);
4016 gfc_free_expr (wait->id);
4017 }
4018
4019
4020 gfc_try
4021 gfc_resolve_wait (gfc_wait *wait)
4022 {
4023 RESOLVE_TAG (&tag_unit, wait->unit);
4024 RESOLVE_TAG (&tag_iomsg, wait->iomsg);
4025 RESOLVE_TAG (&tag_iostat, wait->iostat);
4026 RESOLVE_TAG (&tag_id, wait->id);
4027
4028 if (gfc_reference_st_label (wait->err, ST_LABEL_TARGET) == FAILURE)
4029 return FAILURE;
4030
4031 if (gfc_reference_st_label (wait->end, ST_LABEL_TARGET) == FAILURE)
4032 return FAILURE;
4033
4034 return SUCCESS;
4035 }
4036
4037 /* Match an element of a WAIT statement. */
4038
4039 #define RETM if (m != MATCH_NO) return m;
4040
4041 static match
4042 match_wait_element (gfc_wait *wait)
4043 {
4044 match m;
4045
4046 m = match_etag (&tag_unit, &wait->unit);
4047 RETM m = match_ltag (&tag_err, &wait->err);
4048 RETM m = match_ltag (&tag_end, &wait->eor);
4049 RETM m = match_ltag (&tag_eor, &wait->end);
4050 RETM m = match_out_tag (&tag_iomsg, &wait->iomsg);
4051 RETM m = match_out_tag (&tag_iostat, &wait->iostat);
4052 RETM m = match_etag (&tag_id, &wait->id);
4053 RETM return MATCH_NO;
4054 }
4055
4056 #undef RETM
4057
4058
4059 match
4060 gfc_match_wait (void)
4061 {
4062 gfc_wait *wait;
4063 match m;
4064
4065 m = gfc_match_char ('(');
4066 if (m == MATCH_NO)
4067 return m;
4068
4069 wait = XCNEW (gfc_wait);
4070
4071 m = match_wait_element (wait);
4072 if (m == MATCH_ERROR)
4073 goto cleanup;
4074 if (m == MATCH_NO)
4075 {
4076 m = gfc_match_expr (&wait->unit);
4077 if (m == MATCH_ERROR)
4078 goto cleanup;
4079 if (m == MATCH_NO)
4080 goto syntax;
4081 }
4082
4083 for (;;)
4084 {
4085 if (gfc_match_char (')') == MATCH_YES)
4086 break;
4087 if (gfc_match_char (',') != MATCH_YES)
4088 goto syntax;
4089
4090 m = match_wait_element (wait);
4091 if (m == MATCH_ERROR)
4092 goto cleanup;
4093 if (m == MATCH_NO)
4094 goto syntax;
4095 }
4096
4097 if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: WAIT at %C "
4098 "not allowed in Fortran 95") == FAILURE)
4099 goto cleanup;
4100
4101 if (gfc_pure (NULL))
4102 {
4103 gfc_error ("WAIT statement not allowed in PURE procedure at %C");
4104 goto cleanup;
4105 }
4106
4107 new_st.op = EXEC_WAIT;
4108 new_st.ext.wait = wait;
4109
4110 return MATCH_YES;
4111
4112 syntax:
4113 gfc_syntax_error (ST_WAIT);
4114
4115 cleanup:
4116 gfc_free_wait (wait);
4117 return MATCH_ERROR;
4118 }
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