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PR fortran/15750
[official-gcc.git] / gcc / fortran / io.c
blobee52c6932457135d6765eb554bcc054519a879c4
1 /* Deal with I/O statements & related stuff.
2 Copyright (C) 2000, 2001, 2002, 2003 Free Software Foundation, Inc.
3 Contributed by Andy Vaught
4
5 This file is part of GCC.
6
7 GCC is free software; you can redistribute it and/or modify it under
8 the terms of the GNU General Public License as published by the Free
9 Software Foundation; either version 2, or (at your option) any later
10 version.
11
12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
15 for more details.
16
17 You should have received a copy of the GNU General Public License
18 along with GCC; see the file COPYING. If not, write to the Free
19 Software Foundation, 59 Temple Place - Suite 330, Boston, MA
20 02111-1307, USA. */
21
22 #include "config.h"
23 #include "system.h"
24 #include "flags.h"
25
26 #include <string.h>
27
28 #include "gfortran.h"
29 #include "match.h"
30 #include "parse.h"
31
32 gfc_st_label format_asterisk =
33 { -1, ST_LABEL_FORMAT, ST_LABEL_FORMAT, NULL, 0,
34 {NULL, NULL}, NULL, NULL};
35
36 typedef struct
37 {
38 const char *name, *spec;
39 bt type;
40 }
41 io_tag;
42
43 static const io_tag
44 tag_file = { "FILE", " file = %e", BT_CHARACTER },
45 tag_status = { "STATUS", " status = %e", BT_CHARACTER},
46 tag_e_access = {"ACCESS", " access = %e", BT_CHARACTER},
47 tag_e_form = {"FORM", " form = %e", BT_CHARACTER},
48 tag_e_recl = {"RECL", " recl = %e", BT_INTEGER},
49 tag_e_blank = {"BLANK", " blank = %e", BT_CHARACTER},
50 tag_e_position = {"POSITION", " position = %e", BT_CHARACTER},
51 tag_e_action = {"ACTION", " action = %e", BT_CHARACTER},
52 tag_e_delim = {"DELIM", " delim = %e", BT_CHARACTER},
53 tag_e_pad = {"PAD", " pad = %e", BT_CHARACTER},
54 tag_unit = {"UNIT", " unit = %e", BT_INTEGER},
55 tag_advance = {"ADVANCE", " advance = %e", BT_CHARACTER},
56 tag_rec = {"REC", " rec = %e", BT_INTEGER},
57 tag_format = {"FORMAT", NULL, BT_CHARACTER},
58 tag_iostat = {"IOSTAT", " iostat = %v", BT_INTEGER},
59 tag_size = {"SIZE", " size = %v", BT_INTEGER},
60 tag_exist = {"EXIST", " exist = %v", BT_LOGICAL},
61 tag_opened = {"OPENED", " opened = %v", BT_LOGICAL},
62 tag_named = {"NAMED", " named = %v", BT_LOGICAL},
63 tag_name = {"NAME", " name = %v", BT_CHARACTER},
64 tag_number = {"NUMBER", " number = %v", BT_INTEGER},
65 tag_s_access = {"ACCESS", " access = %v", BT_CHARACTER},
66 tag_sequential = {"SEQUENTIAL", " sequential = %v", BT_CHARACTER},
67 tag_direct = {"DIRECT", " direct = %v", BT_CHARACTER},
68 tag_s_form = {"FORM", " form = %v", BT_CHARACTER},
69 tag_formatted = {"FORMATTED", " formatted = %v", BT_CHARACTER},
70 tag_unformatted = {"UNFORMATTED", " unformatted = %v", BT_CHARACTER},
71 tag_s_recl = {"RECL", " recl = %v", BT_INTEGER},
72 tag_nextrec = {"NEXTREC", " nextrec = %v", BT_INTEGER},
73 tag_s_blank = {"BLANK", " blank = %v", BT_CHARACTER},
74 tag_s_position = {"POSITION", " position = %v", BT_CHARACTER},
75 tag_s_action = {"ACTION", " action = %v", BT_CHARACTER},
76 tag_read = {"READ", " read = %v", BT_CHARACTER},
77 tag_write = {"WRITE", " write = %v", BT_CHARACTER},
78 tag_readwrite = {"READWRITE", " readwrite = %v", BT_CHARACTER},
79 tag_s_delim = {"DELIM", " delim = %v", BT_CHARACTER},
80 tag_s_pad = {"PAD", " pad = %v", BT_CHARACTER},
81 tag_iolength = {"IOLENGTH", " iolength = %v", BT_INTEGER},
82 tag_err = {"ERR", " err = %l", BT_UNKNOWN},
83 tag_end = {"END", " end = %l", BT_UNKNOWN},
84 tag_eor = {"EOR", " eor = %l", BT_UNKNOWN};
85
86 static gfc_dt *current_dt;
87
88 #define RESOLVE_TAG(x, y) if (resolve_tag(x, y) == FAILURE) return FAILURE;
89
90
91 /**************** Fortran 95 FORMAT parser *****************/
92
93 /* FORMAT tokens returned by format_lex(). */
94 typedef enum
95 {
96 FMT_NONE, FMT_UNKNOWN, FMT_SIGNED_INT, FMT_ZERO, FMT_POSINT, FMT_PERIOD,
97 FMT_COMMA, FMT_COLON, FMT_SLASH, FMT_DOLLAR, FMT_POS, FMT_LPAREN,
98 FMT_RPAREN, FMT_X, FMT_SIGN, FMT_BLANK, FMT_CHAR, FMT_P, FMT_IBOZ, FMT_F,
99 FMT_E, FMT_EXT, FMT_G, FMT_L, FMT_A, FMT_D, FMT_H, FMT_END
100 }
101 format_token;
102
103 /* Local variables for checking format strings. The saved_token is
104 used to back up by a single format token during the parsing
105 process. */
106 static char *format_string;
107 static int format_length, use_last_char;
108
109 static format_token saved_token;
110
111 static enum
112 { MODE_STRING, MODE_FORMAT, MODE_COPY }
113 mode;
114
115
116 /* Return the next character in the format string. */
117
118 static char
119 next_char (int in_string)
120 {
121 static char c;
122
123 if (use_last_char)
124 {
125 use_last_char = 0;
126 return c;
127 }
128
129 format_length++;
130
131 if (mode == MODE_STRING)
132 c = *format_string++;
133 else
134 {
135 c = gfc_next_char_literal (in_string);
136 if (c == '\n')
137 c = '\0';
138
139 if (mode == MODE_COPY)
140 *format_string++ = c;
141 }
142
143 c = TOUPPER (c);
144 return c;
145 }
146
147
148 /* Back up one character position. Only works once. */
149
150 static void
151 unget_char (void)
152 {
153
154 use_last_char = 1;
155 }
156
157 static int value = 0;
158
159 /* Simple lexical analyzer for getting the next token in a FORMAT
160 statement. */
161
162 static format_token
163 format_lex (void)
164 {
165 format_token token;
166 char c, delim;
167 int zflag;
168 int negative_flag;
169
170 if (saved_token != FMT_NONE)
171 {
172 token = saved_token;
173 saved_token = FMT_NONE;
174 return token;
175 }
176
177 do
178 {
179 c = next_char (0);
180 }
181 while (gfc_is_whitespace (c));
182
183 negative_flag = 0;
184 switch (c)
185 {
186 case '-':
187 negative_flag = 1;
188 case '+':
189 c = next_char (0);
190 if (!ISDIGIT (c))
191 {
192 token = FMT_UNKNOWN;
193 break;
194 }
195
196 value = c - '0';
197
198 do
199 {
200 c = next_char (0);
201 if(ISDIGIT (c))
202 value = 10 * value + c - '0';
203 }
204 while (ISDIGIT (c));
205
206 unget_char ();
207
208 if (negative_flag)
209 value = -value;
210
211 token = FMT_SIGNED_INT;
212 break;
213
214 case '0':
215 case '1':
216 case '2':
217 case '3':
218 case '4':
219 case '5':
220 case '6':
221 case '7':
222 case '8':
223 case '9':
224 zflag = (c == '0');
225
226 value = c - '0';
227
228 do
229 {
230 c = next_char (0);
231 if (c != '0')
232 zflag = 0;
233 if (ISDIGIT (c))
234 value = 10 * value + c - '0';
235 }
236 while (ISDIGIT (c));
237
238 unget_char ();
239 token = zflag ? FMT_ZERO : FMT_POSINT;
240 break;
241
242 case '.':
243 token = FMT_PERIOD;
244 break;
245
246 case ',':
247 token = FMT_COMMA;
248 break;
249
250 case ':':
251 token = FMT_COLON;
252 break;
253
254 case '/':
255 token = FMT_SLASH;
256 break;
257
258 case '$':
259 token = FMT_DOLLAR;
260 break;
261
262 case 'T':
263 c = next_char (0);
264 if (c != 'L' && c != 'R')
265 unget_char ();
266
267 token = FMT_POS;
268 break;
269
270 case '(':
271 token = FMT_LPAREN;
272 break;
273
274 case ')':
275 token = FMT_RPAREN;
276 break;
277
278 case 'X':
279 token = FMT_X;
280 break;
281
282 case 'S':
283 c = next_char (0);
284 if (c != 'P' && c != 'S')
285 unget_char ();
286
287 token = FMT_SIGN;
288 break;
289
290 case 'B':
291 c = next_char (0);
292 if (c == 'N' || c == 'Z')
293 token = FMT_BLANK;
294 else
295 {
296 unget_char ();
297 token = FMT_IBOZ;
298 }
299
300 break;
301
302 case '\'':
303 case '"':
304 delim = c;
305
306 value = 0;
307
308 for (;;)
309 {
310 c = next_char (1);
311 if (c == '\0')
312 {
313 token = FMT_END;
314 break;
315 }
316
317 if (c == delim)
318 {
319 c = next_char (1);
320
321 if (c == '\0')
322 {
323 token = FMT_END;
324 break;
325 }
326
327 if (c != delim)
328 {
329 unget_char ();
330 token = FMT_CHAR;
331 break;
332 }
333 }
334 value++;
335 }
336 break;
337
338 case 'P':
339 token = FMT_P;
340 break;
341
342 case 'I':
343 case 'O':
344 case 'Z':
345 token = FMT_IBOZ;
346 break;
347
348 case 'F':
349 token = FMT_F;
350 break;
351
352 case 'E':
353 c = next_char (0);
354 if (c == 'N' || c == 'S')
355 token = FMT_EXT;
356 else
357 {
358 token = FMT_E;
359 unget_char ();
360 }
361
362 break;
363
364 case 'G':
365 token = FMT_G;
366 break;
367
368 case 'H':
369 token = FMT_H;
370 break;
371
372 case 'L':
373 token = FMT_L;
374 break;
375
376 case 'A':
377 token = FMT_A;
378 break;
379
380 case 'D':
381 token = FMT_D;
382 break;
383
384 case '\0':
385 token = FMT_END;
386 break;
387
388 default:
389 token = FMT_UNKNOWN;
390 break;
391 }
392
393 return token;
394 }
395
396
397 /* Check a format statement. The format string, either from a FORMAT
398 statement or a constant in an I/O statement has already been parsed
399 by itself, and we are checking it for validity. The dual origin
400 means that the warning message is a little less than great. */
401
402 static try
403 check_format (void)
404 {
405 const char *posint_required = "Positive width required";
406 const char *period_required = "Period required";
407 const char *nonneg_required = "Nonnegative width required";
408 const char *unexpected_element = "Unexpected element";
409 const char *unexpected_end = "Unexpected end of format string";
410
411 const char *error;
412 format_token t, u;
413 int level;
414 int repeat;
415 try rv;
416
417 use_last_char = 0;
418 saved_token = FMT_NONE;
419 level = 0;
420 repeat = 0;
421 rv = SUCCESS;
422
423 t = format_lex ();
424 if (t != FMT_LPAREN)
425 {
426 error = "Missing leading left parenthesis";
427 goto syntax;
428 }
429
430 t = format_lex ();
431 if (t == FMT_RPAREN)
432 goto finished; /* Empty format is legal */
433 saved_token = t;
434
435 format_item:
436 /* In this state, the next thing has to be a format item. */
437 t = format_lex ();
438 switch (t)
439 {
440 case FMT_POSINT:
441 repeat = value;
442 t = format_lex ();
443 if (t == FMT_LPAREN)
444 {
445 level++;
446 goto format_item;
447 }
448
449 if (t == FMT_SLASH)
450 goto optional_comma;
451
452 goto data_desc;
453
454 case FMT_LPAREN:
455 level++;
456 goto format_item;
457
458 case FMT_SIGNED_INT:
459 /* Signed integer can only precede a P format. */
460 t = format_lex ();
461 if (t != FMT_P)
462 {
463 error = "Expected P edit descriptor";
464 goto syntax;
465 }
466
467 goto data_desc;
468
469 case FMT_P:
470 /* P requires a prior number. */
471 error = "P descriptor requires leading scale factor";
472 goto syntax;
473
474 case FMT_X:
475 /* X requires a prior number if we're being pedantic. */
476 if (gfc_notify_std (GFC_STD_GNU, "Extension: X descriptor "
477 "requires leading space count at %C")
478 == FAILURE)
479 return FAILURE;
480 goto between_desc;
481
482 case FMT_SIGN:
483 case FMT_BLANK:
484 goto between_desc;
485
486 case FMT_CHAR:
487 goto extension_optional_comma;
488
489 case FMT_COLON:
490 case FMT_SLASH:
491 goto optional_comma;
492
493 case FMT_DOLLAR:
494 t = format_lex ();
495 if (t != FMT_RPAREN || level > 0)
496 {
497 error = "$ must the last specifier";
498 goto syntax;
499 }
500
501 goto finished;
502
503 case FMT_POS:
504 case FMT_IBOZ:
505 case FMT_F:
506 case FMT_E:
507 case FMT_EXT:
508 case FMT_G:
509 case FMT_L:
510 case FMT_A:
511 case FMT_D:
512 goto data_desc;
513
514 case FMT_H:
515 goto data_desc;
516
517 case FMT_END:
518 error = unexpected_end;
519 goto syntax;
520
521 default:
522 error = unexpected_element;
523 goto syntax;
524 }
525
526 data_desc:
527 /* In this state, t must currently be a data descriptor.
528 Deal with things that can/must follow the descriptor. */
529 switch (t)
530 {
531 case FMT_SIGN:
532 case FMT_BLANK:
533 case FMT_X:
534 break;
535
536 case FMT_P:
537 if (pedantic)
538 {
539 t = format_lex ();
540 if (t == FMT_POSINT)
541 {
542 error = "Repeat count cannot follow P descriptor";
543 goto syntax;
544 }
545
546 saved_token = t;
547 }
548
549 goto optional_comma;
550
551 case FMT_POS:
552 case FMT_L:
553 t = format_lex ();
554 if (t == FMT_POSINT)
555 break;
556
557 error = posint_required;
558 goto syntax;
559
560 case FMT_A:
561 t = format_lex ();
562 if (t != FMT_POSINT)
563 saved_token = t;
564 break;
565
566 case FMT_D:
567 case FMT_E:
568 case FMT_G:
569 case FMT_EXT:
570 u = format_lex ();
571 if (u != FMT_POSINT)
572 {
573 error = posint_required;
574 goto syntax;
575 }
576
577 u = format_lex ();
578 if (u != FMT_PERIOD)
579 {
580 error = period_required;
581 goto syntax;
582 }
583
584 u = format_lex ();
585 if (u != FMT_ZERO && u != FMT_POSINT)
586 {
587 error = nonneg_required;
588 goto syntax;
589 }
590
591 if (t == FMT_D)
592 break;
593
594 /* Look for optional exponent. */
595 u = format_lex ();
596 if (u != FMT_E)
597 {
598 saved_token = u;
599 }
600 else
601 {
602 u = format_lex ();
603 if (u != FMT_POSINT)
604 {
605 error = "Positive exponent width required";
606 goto syntax;
607 }
608 }
609
610 break;
611
612 case FMT_F:
613 t = format_lex ();
614 if (t != FMT_ZERO && t != FMT_POSINT)
615 {
616 error = nonneg_required;
617 goto syntax;
618 }
619
620 t = format_lex ();
621 if (t != FMT_PERIOD)
622 {
623 error = period_required;
624 goto syntax;
625 }
626
627 t = format_lex ();
628 if (t != FMT_ZERO && t != FMT_POSINT)
629 {
630 error = nonneg_required;
631 goto syntax;
632 }
633
634 break;
635
636 case FMT_H:
637 if(mode == MODE_STRING)
638 {
639 format_string += value;
640 format_length -= value;
641 }
642 else
643 {
644 while(repeat >0)
645 {
646 next_char(0);
647 repeat -- ;
648 }
649 }
650 break;
651
652 case FMT_IBOZ:
653 t = format_lex ();
654 if (t != FMT_ZERO && t != FMT_POSINT)
655 {
656 error = nonneg_required;
657 goto syntax;
658 }
659
660 t = format_lex ();
661 if (t != FMT_PERIOD)
662 {
663 saved_token = t;
664 }
665 else
666 {
667 t = format_lex ();
668 if (t != FMT_ZERO && t != FMT_POSINT)
669 {
670 error = nonneg_required;
671 goto syntax;
672 }
673 }
674
675 break;
676
677 default:
678 error = unexpected_element;
679 goto syntax;
680 }
681
682 between_desc:
683 /* Between a descriptor and what comes next. */
684 t = format_lex ();
685 switch (t)
686 {
687
688 case FMT_COMMA:
689 goto format_item;
690
691 case FMT_RPAREN:
692 level--;
693 if (level < 0)
694 goto finished;
695 goto between_desc;
696
697 case FMT_COLON:
698 case FMT_SLASH:
699 goto optional_comma;
700
701 case FMT_END:
702 error = unexpected_end;
703 goto syntax;
704
705 default:
706 error = "Missing comma";
707 goto syntax;
708 }
709
710 optional_comma:
711 /* Optional comma is a weird between state where we've just finished
712 reading a colon, slash or P descriptor. */
713 t = format_lex ();
714 switch (t)
715 {
716 case FMT_COMMA:
717 break;
718
719 case FMT_RPAREN:
720 level--;
721 if (level < 0)
722 goto finished;
723 goto between_desc;
724
725 default:
726 /* Assume that we have another format item. */
727 saved_token = t;
728 break;
729 }
730
731 goto format_item;
732
733 extension_optional_comma:
734 /* As a GNU extension, permit a missing comma after a string literal. */
735 t = format_lex ();
736 switch (t)
737 {
738 case FMT_COMMA:
739 break;
740
741 case FMT_RPAREN:
742 level--;
743 if (level < 0)
744 goto finished;
745 goto between_desc;
746
747 case FMT_COLON:
748 case FMT_SLASH:
749 goto optional_comma;
750
751 case FMT_END:
752 error = unexpected_end;
753 goto syntax;
754
755 default:
756 if (gfc_notify_std (GFC_STD_GNU, "Extension: Missing comma at %C")
757 == FAILURE)
758 return FAILURE;
759 saved_token = t;
760 break;
761 }
762
763 goto format_item;
764
765 syntax:
766 /* Something went wrong. If the format we're checking is a string,
767 generate a warning, since the program is correct. If the format
768 is in a FORMAT statement, this messes up parsing, which is an
769 error. */
770 if (mode != MODE_STRING)
771 gfc_error ("%s in format string at %C", error);
772 else
773 {
774 gfc_warning ("%s in format string at %C", error);
775
776 /* TODO: More elaborate measures are needed to show where a problem
777 is within a format string that has been calculated. */
778 }
779
780 rv = FAILURE;
781
782 finished:
783 return rv;
784 }
785
786
787 /* Given an expression node that is a constant string, see if it looks
788 like a format string. */
789
790 static void
791 check_format_string (gfc_expr * e)
792 {
793
794 mode = MODE_STRING;
795 format_string = e->value.character.string;
796 check_format ();
797 }
798
799
800 /************ Fortran 95 I/O statement matchers *************/
801
802 /* Match a FORMAT statement. This amounts to actually parsing the
803 format descriptors in order to correctly locate the end of the
804 format string. */
805
806 match
807 gfc_match_format (void)
808 {
809 gfc_expr *e;
810 locus start;
811
812 if (gfc_statement_label == NULL)
813 {
814 gfc_error ("Missing format label at %C");
815 return MATCH_ERROR;
816 }
817 gfc_gobble_whitespace ();
818
819 mode = MODE_FORMAT;
820 format_length = 0;
821
822 start = gfc_current_locus;
823
824 if (check_format () == FAILURE)
825 return MATCH_ERROR;
826
827 if (gfc_match_eos () != MATCH_YES)
828 {
829 gfc_syntax_error (ST_FORMAT);
830 return MATCH_ERROR;
831 }
832
833 /* The label doesn't get created until after the statement is done
834 being matched, so we have to leave the string for later. */
835
836 gfc_current_locus = start; /* Back to the beginning */
837
838 new_st.loc = start;
839 new_st.op = EXEC_NOP;
840
841 e = gfc_get_expr();
842 e->expr_type = EXPR_CONSTANT;
843 e->ts.type = BT_CHARACTER;
844 e->ts.kind = gfc_default_character_kind();
845 e->where = start;
846 e->value.character.string = format_string = gfc_getmem(format_length+1);
847 e->value.character.length = format_length;
848 gfc_statement_label->format = e;
849
850 mode = MODE_COPY;
851 check_format (); /* Guaranteed to succeed */
852 gfc_match_eos (); /* Guaranteed to succeed */
853
854 return MATCH_YES;
855 }
856
857
858 /* Match an expression I/O tag of some sort. */
859
860 static match
861 match_etag (const io_tag * tag, gfc_expr ** v)
862 {
863 gfc_expr *result;
864 match m;
865
866 m = gfc_match (tag->spec, &result);
867 if (m != MATCH_YES)
868 return m;
869
870 if (*v != NULL)
871 {
872 gfc_error ("Duplicate %s specification at %C", tag->name);
873 gfc_free_expr (result);
874 return MATCH_ERROR;
875 }
876
877 *v = result;
878 return MATCH_YES;
879 }
880
881
882 /* Match a variable I/O tag of some sort. */
883
884 static match
885 match_vtag (const io_tag * tag, gfc_expr ** v)
886 {
887 gfc_expr *result;
888 match m;
889
890 m = gfc_match (tag->spec, &result);
891 if (m != MATCH_YES)
892 return m;
893
894 if (*v != NULL)
895 {
896 gfc_error ("Duplicate %s specification at %C", tag->name);
897 gfc_free_expr (result);
898 return MATCH_ERROR;
899 }
900
901 if (result->symtree->n.sym->attr.intent == INTENT_IN)
902 {
903 gfc_error ("Variable tag cannot be INTENT(IN) at %C");
904 gfc_free_expr (result);
905 return MATCH_ERROR;
906 }
907
908 if (gfc_pure (NULL) && gfc_impure_variable (result->symtree->n.sym))
909 {
910 gfc_error ("Variable tag cannot be assigned in PURE procedure at %C");
911 gfc_free_expr (result);
912 return MATCH_ERROR;
913 }
914
915 *v = result;
916 return MATCH_YES;
917 }
918
919
920 /* Match a label I/O tag. */
921
922 static match
923 match_ltag (const io_tag * tag, gfc_st_label ** label)
924 {
925 match m;
926 gfc_st_label *old;
927
928 old = *label;
929 m = gfc_match (tag->spec, label);
930 if (m == MATCH_YES && old != 0)
931 {
932 gfc_error ("Duplicate %s label specification at %C", tag->name);
933 return MATCH_ERROR;
934 }
935
936 return m;
937 }
938
939
940 /* Do expression resolution and type-checking on an expression tag. */
941
942 static try
943 resolve_tag (const io_tag * tag, gfc_expr * e)
944 {
945
946 if (e == NULL)
947 return SUCCESS;
948
949 if (gfc_resolve_expr (e) == FAILURE)
950 return FAILURE;
951
952 if (e->ts.type != tag->type)
953 {
954 /* Format label can be integer varibale. */
955 if (tag != &tag_format)
956 {
957 gfc_error ("%s tag at %L must be of type %s", tag->name, &e->where,
958 gfc_basic_typename (tag->type));
959 return FAILURE;
960 }
961 }
962
963 if (tag == &tag_format)
964 {
965 if (e->rank != 1 && e->rank != 0)
966 {
967 gfc_error ("FORMAT tag at %L cannot be array of strings",
968 &e->where);
969 return FAILURE;
970 }
971 }
972 else
973 {
974 if (e->rank != 0)
975 {
976 gfc_error ("%s tag at %L must be scalar", tag->name, &e->where);
977 return FAILURE;
978 }
979 }
980
981 return SUCCESS;
982 }
983
984
985 /* Match a single tag of an OPEN statement. */
986
987 static match
988 match_open_element (gfc_open * open)
989 {
990 match m;
991
992 m = match_etag (&tag_unit, &open->unit);
993 if (m != MATCH_NO)
994 return m;
995 m = match_vtag (&tag_iostat, &open->iostat);
996 if (m != MATCH_NO)
997 return m;
998 m = match_etag (&tag_file, &open->file);
999 if (m != MATCH_NO)
1000 return m;
1001 m = match_etag (&tag_status, &open->status);
1002 if (m != MATCH_NO)
1003 return m;
1004 m = match_etag (&tag_e_access, &open->access);
1005 if (m != MATCH_NO)
1006 return m;
1007 m = match_etag (&tag_e_form, &open->form);
1008 if (m != MATCH_NO)
1009 return m;
1010 m = match_etag (&tag_e_recl, &open->recl);
1011 if (m != MATCH_NO)
1012 return m;
1013 m = match_etag (&tag_e_blank, &open->blank);
1014 if (m != MATCH_NO)
1015 return m;
1016 m = match_etag (&tag_e_position, &open->position);
1017 if (m != MATCH_NO)
1018 return m;
1019 m = match_etag (&tag_e_action, &open->action);
1020 if (m != MATCH_NO)
1021 return m;
1022 m = match_etag (&tag_e_delim, &open->delim);
1023 if (m != MATCH_NO)
1024 return m;
1025 m = match_etag (&tag_e_pad, &open->pad);
1026 if (m != MATCH_NO)
1027 return m;
1028 m = match_ltag (&tag_err, &open->err);
1029 if (m != MATCH_NO)
1030 return m;
1031
1032 return MATCH_NO;
1033 }
1034
1035
1036 /* Free the gfc_open structure and all the expressions it contains. */
1037
1038 void
1039 gfc_free_open (gfc_open * open)
1040 {
1041
1042 if (open == NULL)
1043 return;
1044
1045 gfc_free_expr (open->unit);
1046 gfc_free_expr (open->iostat);
1047 gfc_free_expr (open->file);
1048 gfc_free_expr (open->status);
1049 gfc_free_expr (open->access);
1050 gfc_free_expr (open->form);
1051 gfc_free_expr (open->recl);
1052 gfc_free_expr (open->blank);
1053 gfc_free_expr (open->position);
1054 gfc_free_expr (open->action);
1055 gfc_free_expr (open->delim);
1056 gfc_free_expr (open->pad);
1057
1058 gfc_free (open);
1059 }
1060
1061
1062 /* Resolve everything in a gfc_open structure. */
1063
1064 try
1065 gfc_resolve_open (gfc_open * open)
1066 {
1067
1068 RESOLVE_TAG (&tag_unit, open->unit);
1069 RESOLVE_TAG (&tag_iostat, open->iostat);
1070 RESOLVE_TAG (&tag_file, open->file);
1071 RESOLVE_TAG (&tag_status, open->status);
1072 RESOLVE_TAG (&tag_e_form, open->form);
1073 RESOLVE_TAG (&tag_e_recl, open->recl);
1074
1075 RESOLVE_TAG (&tag_e_blank, open->blank);
1076 RESOLVE_TAG (&tag_e_position, open->position);
1077 RESOLVE_TAG (&tag_e_action, open->action);
1078 RESOLVE_TAG (&tag_e_delim, open->delim);
1079 RESOLVE_TAG (&tag_e_pad, open->pad);
1080
1081 if (gfc_reference_st_label (open->err, ST_LABEL_TARGET) == FAILURE)
1082 return FAILURE;
1083
1084 return SUCCESS;
1085 }
1086
1087
1088 /* Match an OPEN statmement. */
1089
1090 match
1091 gfc_match_open (void)
1092 {
1093 gfc_open *open;
1094 match m;
1095
1096 m = gfc_match_char ('(');
1097 if (m == MATCH_NO)
1098 return m;
1099
1100 open = gfc_getmem (sizeof (gfc_open));
1101
1102 m = match_open_element (open);
1103
1104 if (m == MATCH_ERROR)
1105 goto cleanup;
1106 if (m == MATCH_NO)
1107 {
1108 m = gfc_match_expr (&open->unit);
1109 if (m == MATCH_NO)
1110 goto syntax;
1111 if (m == MATCH_ERROR)
1112 goto cleanup;
1113 }
1114
1115 for (;;)
1116 {
1117 if (gfc_match_char (')') == MATCH_YES)
1118 break;
1119 if (gfc_match_char (',') != MATCH_YES)
1120 goto syntax;
1121
1122 m = match_open_element (open);
1123 if (m == MATCH_ERROR)
1124 goto cleanup;
1125 if (m == MATCH_NO)
1126 goto syntax;
1127 }
1128
1129 if (gfc_match_eos () == MATCH_NO)
1130 goto syntax;
1131
1132 if (gfc_pure (NULL))
1133 {
1134 gfc_error ("OPEN statement not allowed in PURE procedure at %C");
1135 goto cleanup;
1136 }
1137
1138 new_st.op = EXEC_OPEN;
1139 new_st.ext.open = open;
1140 return MATCH_YES;
1141
1142 syntax:
1143 gfc_syntax_error (ST_OPEN);
1144
1145 cleanup:
1146 gfc_free_open (open);
1147 return MATCH_ERROR;
1148 }
1149
1150
1151 /* Free a gfc_close structure an all its expressions. */
1152
1153 void
1154 gfc_free_close (gfc_close * close)
1155 {
1156
1157 if (close == NULL)
1158 return;
1159
1160 gfc_free_expr (close->unit);
1161 gfc_free_expr (close->iostat);
1162 gfc_free_expr (close->status);
1163
1164 gfc_free (close);
1165 }
1166
1167
1168 /* Match elements of a CLOSE statment. */
1169
1170 static match
1171 match_close_element (gfc_close * close)
1172 {
1173 match m;
1174
1175 m = match_etag (&tag_unit, &close->unit);
1176 if (m != MATCH_NO)
1177 return m;
1178 m = match_etag (&tag_status, &close->status);
1179 if (m != MATCH_NO)
1180 return m;
1181 m = match_vtag (&tag_iostat, &close->iostat);
1182 if (m != MATCH_NO)
1183 return m;
1184 m = match_ltag (&tag_err, &close->err);
1185 if (m != MATCH_NO)
1186 return m;
1187
1188 return MATCH_NO;
1189 }
1190
1191
1192 /* Match a CLOSE statement. */
1193
1194 match
1195 gfc_match_close (void)
1196 {
1197 gfc_close *close;
1198 match m;
1199
1200 m = gfc_match_char ('(');
1201 if (m == MATCH_NO)
1202 return m;
1203
1204 close = gfc_getmem (sizeof (gfc_close));
1205
1206 m = match_close_element (close);
1207
1208 if (m == MATCH_ERROR)
1209 goto cleanup;
1210 if (m == MATCH_NO)
1211 {
1212 m = gfc_match_expr (&close->unit);
1213 if (m == MATCH_NO)
1214 goto syntax;
1215 if (m == MATCH_ERROR)
1216 goto cleanup;
1217 }
1218
1219 for (;;)
1220 {
1221 if (gfc_match_char (')') == MATCH_YES)
1222 break;
1223 if (gfc_match_char (',') != MATCH_YES)
1224 goto syntax;
1225
1226 m = match_close_element (close);
1227 if (m == MATCH_ERROR)
1228 goto cleanup;
1229 if (m == MATCH_NO)
1230 goto syntax;
1231 }
1232
1233 if (gfc_match_eos () == MATCH_NO)
1234 goto syntax;
1235
1236 if (gfc_pure (NULL))
1237 {
1238 gfc_error ("CLOSE statement not allowed in PURE procedure at %C");
1239 goto cleanup;
1240 }
1241
1242 new_st.op = EXEC_CLOSE;
1243 new_st.ext.close = close;
1244 return MATCH_YES;
1245
1246 syntax:
1247 gfc_syntax_error (ST_CLOSE);
1248
1249 cleanup:
1250 gfc_free_close (close);
1251 return MATCH_ERROR;
1252 }
1253
1254
1255 /* Resolve everything in a gfc_close structure. */
1256
1257 try
1258 gfc_resolve_close (gfc_close * close)
1259 {
1260
1261 RESOLVE_TAG (&tag_unit, close->unit);
1262 RESOLVE_TAG (&tag_iostat, close->iostat);
1263 RESOLVE_TAG (&tag_status, close->status);
1264
1265 if (gfc_reference_st_label (close->err, ST_LABEL_TARGET) == FAILURE)
1266 return FAILURE;
1267
1268 return SUCCESS;
1269 }
1270
1271
1272 /* Free a gfc_filepos structure. */
1273
1274 void
1275 gfc_free_filepos (gfc_filepos * fp)
1276 {
1277
1278 gfc_free_expr (fp->unit);
1279 gfc_free_expr (fp->iostat);
1280 gfc_free (fp);
1281 }
1282
1283
1284 /* Match elements of a REWIND, BACKSPACE or ENDFILE statement. */
1285
1286 static match
1287 match_file_element (gfc_filepos * fp)
1288 {
1289 match m;
1290
1291 m = match_etag (&tag_unit, &fp->unit);
1292 if (m != MATCH_NO)
1293 return m;
1294 m = match_vtag (&tag_iostat, &fp->iostat);
1295 if (m != MATCH_NO)
1296 return m;
1297 m = match_ltag (&tag_err, &fp->err);
1298 if (m != MATCH_NO)
1299 return m;
1300
1301 return MATCH_NO;
1302 }
1303
1304
1305 /* Match the second half of the file-positioning statements, REWIND,
1306 BACKSPACE or ENDFILE. */
1307
1308 static match
1309 match_filepos (gfc_statement st, gfc_exec_op op)
1310 {
1311 gfc_filepos *fp;
1312 match m;
1313
1314 fp = gfc_getmem (sizeof (gfc_filepos));
1315
1316 if (gfc_match_char ('(') == MATCH_NO)
1317 {
1318 m = gfc_match_expr (&fp->unit);
1319 if (m == MATCH_ERROR)
1320 goto cleanup;
1321 if (m == MATCH_NO)
1322 goto syntax;
1323
1324 goto done;
1325 }
1326
1327 m = match_file_element (fp);
1328 if (m == MATCH_ERROR)
1329 goto done;
1330 if (m == MATCH_NO)
1331 {
1332 m = gfc_match_expr (&fp->unit);
1333 if (m == MATCH_ERROR)
1334 goto done;
1335 if (m == MATCH_NO)
1336 goto syntax;
1337 }
1338
1339 for (;;)
1340 {
1341 if (gfc_match_char (')') == MATCH_YES)
1342 break;
1343 if (gfc_match_char (',') != MATCH_YES)
1344 goto syntax;
1345
1346 m = match_file_element (fp);
1347 if (m == MATCH_ERROR)
1348 goto cleanup;
1349 if (m == MATCH_NO)
1350 goto syntax;
1351 }
1352
1353 done:
1354 if (gfc_match_eos () != MATCH_YES)
1355 goto syntax;
1356
1357 if (gfc_pure (NULL))
1358 {
1359 gfc_error ("%s statement not allowed in PURE procedure at %C",
1360 gfc_ascii_statement (st));
1361
1362 goto cleanup;
1363 }
1364
1365 new_st.op = op;
1366 new_st.ext.filepos = fp;
1367 return MATCH_YES;
1368
1369 syntax:
1370 gfc_syntax_error (st);
1371
1372 cleanup:
1373 gfc_free_filepos (fp);
1374 return MATCH_ERROR;
1375 }
1376
1377
1378 try
1379 gfc_resolve_filepos (gfc_filepos * fp)
1380 {
1381
1382 RESOLVE_TAG (&tag_unit, fp->unit);
1383 if (gfc_reference_st_label (fp->err, ST_LABEL_TARGET) == FAILURE)
1384 return FAILURE;
1385
1386 return SUCCESS;
1387 }
1388
1389
1390 /* Match the file positioning statements: ENDFILE, BACKSPACE or
1391 REWIND. */
1392
1393 match
1394 gfc_match_endfile (void)
1395 {
1396
1397 return match_filepos (ST_END_FILE, EXEC_ENDFILE);
1398 }
1399
1400 match
1401 gfc_match_backspace (void)
1402 {
1403
1404 return match_filepos (ST_BACKSPACE, EXEC_BACKSPACE);
1405 }
1406
1407 match
1408 gfc_match_rewind (void)
1409 {
1410
1411 return match_filepos (ST_REWIND, EXEC_REWIND);
1412 }
1413
1414
1415 /******************** Data Transfer Statments *********************/
1416
1417 typedef enum
1418 { M_READ, M_WRITE, M_PRINT, M_INQUIRE }
1419 io_kind;
1420
1421
1422 /* Return a default unit number. */
1423
1424 static gfc_expr *
1425 default_unit (io_kind k)
1426 {
1427 int unit;
1428
1429 if (k == M_READ)
1430 unit = 5;
1431 else
1432 unit = 6;
1433
1434 return gfc_int_expr (unit);
1435 }
1436
1437
1438 /* Match a unit specification for a data transfer statement. */
1439
1440 static match
1441 match_dt_unit (io_kind k, gfc_dt * dt)
1442 {
1443 gfc_expr *e;
1444
1445 if (gfc_match_char ('*') == MATCH_YES)
1446 {
1447 if (dt->io_unit != NULL)
1448 goto conflict;
1449
1450 dt->io_unit = default_unit (k);
1451 return MATCH_YES;
1452 }
1453
1454 if (gfc_match_expr (&e) == MATCH_YES)
1455 {
1456 if (dt->io_unit != NULL)
1457 {
1458 gfc_free_expr (e);
1459 goto conflict;
1460 }
1461
1462 dt->io_unit = e;
1463 return MATCH_YES;
1464 }
1465
1466 return MATCH_NO;
1467
1468 conflict:
1469 gfc_error ("Duplicate UNIT specification at %C");
1470 return MATCH_ERROR;
1471 }
1472
1473
1474 /* Match a format specification. */
1475
1476 static match
1477 match_dt_format (gfc_dt * dt)
1478 {
1479 locus where;
1480 gfc_expr *e;
1481 gfc_st_label *label;
1482
1483 where = gfc_current_locus;
1484
1485 if (gfc_match_char ('*') == MATCH_YES)
1486 {
1487 if (dt->format_expr != NULL || dt->format_label != NULL)
1488 goto conflict;
1489
1490 dt->format_label = &format_asterisk;
1491 return MATCH_YES;
1492 }
1493
1494 if (gfc_match_st_label (&label, 0) == MATCH_YES)
1495 {
1496 if (dt->format_expr != NULL || dt->format_label != NULL)
1497 {
1498 gfc_free_st_label (label);
1499 goto conflict;
1500 }
1501
1502 if (gfc_reference_st_label (label, ST_LABEL_FORMAT) == FAILURE)
1503 return MATCH_ERROR;
1504
1505 dt->format_label = label;
1506 return MATCH_YES;
1507 }
1508
1509 if (gfc_match_expr (&e) == MATCH_YES)
1510 {
1511 if (dt->format_expr != NULL || dt->format_label != NULL)
1512 {
1513 gfc_free_expr (e);
1514 goto conflict;
1515 }
1516 if (e->ts.type == BT_INTEGER && e->rank == 0)
1517 e->symtree->n.sym->attr.assign = 1;
1518
1519 dt->format_expr = e;
1520 return MATCH_YES;
1521 }
1522
1523 gfc_current_locus = where; /* The only case where we have to restore */
1524
1525 return MATCH_NO;
1526
1527 conflict:
1528 gfc_error ("Duplicate format specification at %C");
1529 return MATCH_ERROR;
1530 }
1531
1532
1533 /* Traverse a namelist that is part of a READ statement to make sure
1534 that none of the variables in the namelist are INTENT(IN). Returns
1535 nonzero if we find such a variable. */
1536
1537 static int
1538 check_namelist (gfc_symbol * sym)
1539 {
1540 gfc_namelist *p;
1541
1542 for (p = sym->namelist; p; p = p->next)
1543 if (p->sym->attr.intent == INTENT_IN)
1544 {
1545 gfc_error ("Symbol '%s' in namelist '%s' is INTENT(IN) at %C",
1546 p->sym->name, sym->name);
1547 return 1;
1548 }
1549
1550 return 0;
1551 }
1552
1553
1554 /* Match a single data transfer element. */
1555
1556 static match
1557 match_dt_element (io_kind k, gfc_dt * dt)
1558 {
1559 char name[GFC_MAX_SYMBOL_LEN + 1];
1560 gfc_symbol *sym;
1561 match m;
1562
1563 if (gfc_match (" unit =") == MATCH_YES)
1564 {
1565 m = match_dt_unit (k, dt);
1566 if (m != MATCH_NO)
1567 return m;
1568 }
1569
1570 if (gfc_match (" fmt =") == MATCH_YES)
1571 {
1572 m = match_dt_format (dt);
1573 if (m != MATCH_NO)
1574 return m;
1575 }
1576
1577 if (gfc_match (" nml = %n", name) == MATCH_YES)
1578 {
1579 if (dt->namelist != NULL)
1580 {
1581 gfc_error ("Duplicate NML specification at %C");
1582 return MATCH_ERROR;
1583 }
1584
1585 if (gfc_find_symbol (name, NULL, 1, &sym))
1586 return MATCH_ERROR;
1587
1588 if (sym == NULL || sym->attr.flavor != FL_NAMELIST)
1589 {
1590 gfc_error ("Symbol '%s' at %C must be a NAMELIST group name",
1591 sym != NULL ? sym->name : name);
1592 return MATCH_ERROR;
1593 }
1594
1595 dt->namelist = sym;
1596 if (k == M_READ && check_namelist (sym))
1597 return MATCH_ERROR;
1598
1599 return MATCH_YES;
1600 }
1601
1602 m = match_etag (&tag_rec, &dt->rec);
1603 if (m != MATCH_NO)
1604 return m;
1605 m = match_vtag (&tag_iostat, &dt->iostat);
1606 if (m != MATCH_NO)
1607 return m;
1608 m = match_ltag (&tag_err, &dt->err);
1609 if (m != MATCH_NO)
1610 return m;
1611 m = match_etag (&tag_advance, &dt->advance);
1612 if (m != MATCH_NO)
1613 return m;
1614 m = match_vtag (&tag_size, &dt->size);
1615 if (m != MATCH_NO)
1616 return m;
1617
1618 m = match_ltag (&tag_end, &dt->end);
1619 if (m == MATCH_YES)
1620 dt->end_where = gfc_current_locus;
1621 if (m != MATCH_NO)
1622 return m;
1623
1624 m = match_ltag (&tag_eor, &dt->eor);
1625 if (m == MATCH_YES)
1626 dt->eor_where = gfc_current_locus;
1627 if (m != MATCH_NO)
1628 return m;
1629
1630 return MATCH_NO;
1631 }
1632
1633
1634 /* Free a data transfer structure and everything below it. */
1635
1636 void
1637 gfc_free_dt (gfc_dt * dt)
1638 {
1639
1640 if (dt == NULL)
1641 return;
1642
1643 gfc_free_expr (dt->io_unit);
1644 gfc_free_expr (dt->format_expr);
1645 gfc_free_expr (dt->rec);
1646 gfc_free_expr (dt->advance);
1647 gfc_free_expr (dt->iostat);
1648 gfc_free_expr (dt->size);
1649
1650 gfc_free (dt);
1651 }
1652
1653
1654 /* Resolve everything in a gfc_dt structure. */
1655
1656 try
1657 gfc_resolve_dt (gfc_dt * dt)
1658 {
1659 gfc_expr *e;
1660
1661 RESOLVE_TAG (&tag_format, dt->format_expr);
1662 RESOLVE_TAG (&tag_rec, dt->rec);
1663 RESOLVE_TAG (&tag_advance, dt->advance);
1664 RESOLVE_TAG (&tag_iostat, dt->iostat);
1665 RESOLVE_TAG (&tag_size, dt->size);
1666
1667 e = dt->io_unit;
1668 if (gfc_resolve_expr (e) == SUCCESS
1669 && (e->ts.type != BT_INTEGER
1670 && (e->ts.type != BT_CHARACTER
1671 || e->expr_type != EXPR_VARIABLE)))
1672 {
1673 gfc_error
1674 ("UNIT specification at %L must be an INTEGER expression or a "
1675 "CHARACTER variable", &e->where);
1676 return FAILURE;
1677 }
1678
1679 /* Sanity checks on data transfer statements. */
1680 if (e->ts.type == BT_CHARACTER)
1681 {
1682 if (dt->rec != NULL)
1683 {
1684 gfc_error ("REC tag at %L is incompatible with internal file",
1685 &dt->rec->where);
1686 return FAILURE;
1687 }
1688
1689 if (dt->namelist != NULL)
1690 {
1691 gfc_error ("Internal file at %L is incompatible with namelist",
1692 &dt->io_unit->where);
1693 return FAILURE;
1694 }
1695
1696 if (dt->advance != NULL)
1697 {
1698 gfc_error ("ADVANCE tag at %L is incompatible with internal file",
1699 &dt->advance->where);
1700 return FAILURE;
1701 }
1702 }
1703
1704 if (dt->rec != NULL)
1705 {
1706 if (dt->end != NULL)
1707 {
1708 gfc_error ("REC tag at %L is incompatible with END tag",
1709 &dt->rec->where);
1710 return FAILURE;
1711 }
1712
1713 if (dt->format_label == &format_asterisk)
1714 {
1715 gfc_error
1716 ("END tag at %L is incompatible with list directed format (*)",
1717 &dt->end_where);
1718 return FAILURE;
1719 }
1720
1721 if (dt->namelist != NULL)
1722 {
1723 gfc_error ("REC tag at %L is incompatible with namelist",
1724 &dt->rec->where);
1725 return FAILURE;
1726 }
1727 }
1728
1729 if (dt->advance != NULL && dt->format_label == &format_asterisk)
1730 {
1731 gfc_error ("ADVANCE tag at %L is incompatible with list directed "
1732 "format (*)", &dt->advance->where);
1733 return FAILURE;
1734 }
1735
1736 if (dt->eor != 0 && dt->advance == NULL)
1737 {
1738 gfc_error ("EOR tag at %L requires an ADVANCE tag", &dt->eor_where);
1739 return FAILURE;
1740 }
1741
1742 if (dt->size != NULL && dt->advance == NULL)
1743 {
1744 gfc_error ("SIZE tag at %L requires an ADVANCE tag", &dt->size->where);
1745 return FAILURE;
1746 }
1747
1748 /* TODO: Make sure the ADVANCE tag is 'yes' or 'no' if it is a string
1749 constant. */
1750
1751 if (gfc_reference_st_label (dt->err, ST_LABEL_TARGET) == FAILURE)
1752 return FAILURE;
1753
1754 if (gfc_reference_st_label (dt->end, ST_LABEL_TARGET) == FAILURE)
1755 return FAILURE;
1756
1757 if (gfc_reference_st_label (dt->eor, ST_LABEL_TARGET) == FAILURE)
1758 return FAILURE;
1759
1760 /* Check the format label ectually exists. */
1761 if (dt->format_label && dt->format_label != &format_asterisk
1762 && dt->format_label->defined == ST_LABEL_UNKNOWN)
1763 {
1764 gfc_error ("FORMAT label %d at %L not defined", dt->format_label->value,
1765 &dt->format_label->where);
1766 return FAILURE;
1767 }
1768 return SUCCESS;
1769 }
1770
1771
1772 /* Given an io_kind, return its name. */
1773
1774 static const char *
1775 io_kind_name (io_kind k)
1776 {
1777 const char *name;
1778
1779 switch (k)
1780 {
1781 case M_READ:
1782 name = "READ";
1783 break;
1784 case M_WRITE:
1785 name = "WRITE";
1786 break;
1787 case M_PRINT:
1788 name = "PRINT";
1789 break;
1790 case M_INQUIRE:
1791 name = "INQUIRE";
1792 break;
1793 default:
1794 gfc_internal_error ("io_kind_name(): bad I/O-kind");
1795 }
1796
1797 return name;
1798 }
1799
1800
1801 /* Match an IO iteration statement of the form:
1802
1803 ( [<IO element> ,] <IO element>, I = <expr>, <expr> [, <expr> ] )
1804
1805 which is equivalent to a single IO element. This function is
1806 mutually recursive with match_io_element(). */
1807
1808 static match match_io_element (io_kind k, gfc_code **);
1809
1810 static match
1811 match_io_iterator (io_kind k, gfc_code ** result)
1812 {
1813 gfc_code *head, *tail, *new;
1814 gfc_iterator *iter;
1815 locus old_loc;
1816 match m;
1817 int n;
1818
1819 iter = NULL;
1820 head = NULL;
1821 old_loc = gfc_current_locus;
1822
1823 if (gfc_match_char ('(') != MATCH_YES)
1824 return MATCH_NO;
1825
1826 m = match_io_element (k, &head);
1827 tail = head;
1828
1829 if (m != MATCH_YES || gfc_match_char (',') != MATCH_YES)
1830 {
1831 m = MATCH_NO;
1832 goto cleanup;
1833 }
1834
1835 /* Can't be anything but an IO iterator. Build a list. */
1836 iter = gfc_get_iterator ();
1837
1838 for (n = 1;; n++)
1839 {
1840 m = gfc_match_iterator (iter, 0);
1841 if (m == MATCH_ERROR)
1842 goto cleanup;
1843 if (m == MATCH_YES)
1844 break;
1845
1846 m = match_io_element (k, &new);
1847 if (m == MATCH_ERROR)
1848 goto cleanup;
1849 if (m == MATCH_NO)
1850 {
1851 if (n > 2)
1852 goto syntax;
1853 goto cleanup;
1854 }
1855
1856 tail = gfc_append_code (tail, new);
1857
1858 if (gfc_match_char (',') != MATCH_YES)
1859 {
1860 if (n > 2)
1861 goto syntax;
1862 m = MATCH_NO;
1863 goto cleanup;
1864 }
1865 }
1866
1867 if (gfc_match_char (')') != MATCH_YES)
1868 goto syntax;
1869
1870 new = gfc_get_code ();
1871 new->op = EXEC_DO;
1872 new->ext.iterator = iter;
1873
1874 new->block = gfc_get_code ();
1875 new->block->op = EXEC_DO;
1876 new->block->next = head;
1877
1878 *result = new;
1879 return MATCH_YES;
1880
1881 syntax:
1882 gfc_error ("Syntax error in I/O iterator at %C");
1883 m = MATCH_ERROR;
1884
1885 cleanup:
1886 gfc_free_iterator (iter, 1);
1887 gfc_free_statements (head);
1888 gfc_current_locus = old_loc;
1889 return m;
1890 }
1891
1892
1893 /* Match a single element of an IO list, which is either a single
1894 expression or an IO Iterator. */
1895
1896 static match
1897 match_io_element (io_kind k, gfc_code ** cpp)
1898 {
1899 gfc_expr *expr;
1900 gfc_code *cp;
1901 match m;
1902
1903 expr = NULL;
1904
1905 m = match_io_iterator (k, cpp);
1906 if (m == MATCH_YES)
1907 return MATCH_YES;
1908
1909 if (k == M_READ)
1910 {
1911 m = gfc_match_variable (&expr, 0);
1912 if (m == MATCH_NO)
1913 gfc_error ("Expected variable in READ statement at %C");
1914 }
1915 else
1916 {
1917 m = gfc_match_expr (&expr);
1918 if (m == MATCH_NO)
1919 gfc_error ("Expected expression in %s statement at %C",
1920 io_kind_name (k));
1921 }
1922
1923 if (m == MATCH_YES)
1924 switch (k)
1925 {
1926 case M_READ:
1927 if (expr->symtree->n.sym->attr.intent == INTENT_IN)
1928 {
1929 gfc_error
1930 ("Variable '%s' in input list at %C cannot be INTENT(IN)",
1931 expr->symtree->n.sym->name);
1932 m = MATCH_ERROR;
1933 }
1934
1935 if (gfc_pure (NULL)
1936 && gfc_impure_variable (expr->symtree->n.sym)
1937 && current_dt->io_unit->ts.type == BT_CHARACTER)
1938 {
1939 gfc_error ("Cannot read to variable '%s' in PURE procedure at %C",
1940 expr->symtree->n.sym->name);
1941 m = MATCH_ERROR;
1942 }
1943
1944 break;
1945
1946 case M_WRITE:
1947 if (current_dt->io_unit->ts.type == BT_CHARACTER
1948 && gfc_pure (NULL)
1949 && current_dt->io_unit->expr_type == EXPR_VARIABLE
1950 && gfc_impure_variable (current_dt->io_unit->symtree->n.sym))
1951 {
1952 gfc_error
1953 ("Cannot write to internal file unit '%s' at %C inside a "
1954 "PURE procedure", current_dt->io_unit->symtree->n.sym->name);
1955 m = MATCH_ERROR;
1956 }
1957
1958 break;
1959
1960 default:
1961 break;
1962 }
1963
1964 if (m != MATCH_YES)
1965 {
1966 gfc_free_expr (expr);
1967 return MATCH_ERROR;
1968 }
1969
1970 cp = gfc_get_code ();
1971 cp->op = EXEC_TRANSFER;
1972 cp->expr = expr;
1973
1974 *cpp = cp;
1975 return MATCH_YES;
1976 }
1977
1978
1979 /* Match an I/O list, building gfc_code structures as we go. */
1980
1981 static match
1982 match_io_list (io_kind k, gfc_code ** head_p)
1983 {
1984 gfc_code *head, *tail, *new;
1985 match m;
1986
1987 *head_p = head = tail = NULL;
1988 if (gfc_match_eos () == MATCH_YES)
1989 return MATCH_YES;
1990
1991 for (;;)
1992 {
1993 m = match_io_element (k, &new);
1994 if (m == MATCH_ERROR)
1995 goto cleanup;
1996 if (m == MATCH_NO)
1997 goto syntax;
1998
1999 tail = gfc_append_code (tail, new);
2000 if (head == NULL)
2001 head = new;
2002
2003 if (gfc_match_eos () == MATCH_YES)
2004 break;
2005 if (gfc_match_char (',') != MATCH_YES)
2006 goto syntax;
2007 }
2008
2009 *head_p = head;
2010 return MATCH_YES;
2011
2012 syntax:
2013 gfc_error ("Syntax error in %s statement at %C", io_kind_name (k));
2014
2015 cleanup:
2016 gfc_free_statements (head);
2017 return MATCH_ERROR;
2018 }
2019
2020
2021 /* Attach the data transfer end node. */
2022
2023 static void
2024 terminate_io (gfc_code * io_code)
2025 {
2026 gfc_code *c;
2027
2028 if (io_code == NULL)
2029 io_code = &new_st;
2030
2031 c = gfc_get_code ();
2032 c->op = EXEC_DT_END;
2033
2034 /* Point to structure that is already there */
2035 c->ext.dt = new_st.ext.dt;
2036 gfc_append_code (io_code, c);
2037 }
2038
2039
2040 /* Match a READ, WRITE or PRINT statement. */
2041
2042 static match
2043 match_io (io_kind k)
2044 {
2045 char name[GFC_MAX_SYMBOL_LEN + 1];
2046 gfc_code *io_code;
2047 gfc_symbol *sym;
2048 gfc_expr *expr;
2049 int comma_flag;
2050 locus where;
2051 gfc_dt *dt;
2052 match m;
2053
2054 comma_flag = 0;
2055 current_dt = dt = gfc_getmem (sizeof (gfc_dt));
2056
2057 if (gfc_match_char ('(') == MATCH_NO)
2058 {
2059 if (k == M_WRITE)
2060 goto syntax;
2061
2062 m = match_dt_format (dt);
2063 if (m == MATCH_ERROR)
2064 goto cleanup;
2065 if (m == MATCH_NO)
2066 goto syntax;
2067
2068 comma_flag = 1;
2069 dt->io_unit = default_unit (k);
2070 goto get_io_list;
2071 }
2072
2073 /* Match a control list */
2074 if (match_dt_element (k, dt) == MATCH_YES)
2075 goto next;
2076 if (match_dt_unit (k, dt) != MATCH_YES)
2077 goto loop;
2078
2079 if (gfc_match_char (')') == MATCH_YES)
2080 goto get_io_list;
2081 if (gfc_match_char (',') != MATCH_YES)
2082 goto syntax;
2083
2084 m = match_dt_element (k, dt);
2085 if (m == MATCH_YES)
2086 goto next;
2087 if (m == MATCH_ERROR)
2088 goto cleanup;
2089
2090 m = match_dt_format (dt);
2091 if (m == MATCH_YES)
2092 goto next;
2093 if (m == MATCH_ERROR)
2094 goto cleanup;
2095
2096 where = gfc_current_locus;
2097
2098 if (gfc_match_name (name) == MATCH_YES
2099 && !gfc_find_symbol (name, NULL, 1, &sym)
2100 && sym->attr.flavor == FL_NAMELIST)
2101 {
2102 dt->namelist = sym;
2103 if (k == M_READ && check_namelist (sym))
2104 {
2105 m = MATCH_ERROR;
2106 goto cleanup;
2107 }
2108 goto next;
2109 }
2110
2111 gfc_current_locus = where;
2112
2113 goto loop; /* No matches, try regular elements */
2114
2115 next:
2116 if (gfc_match_char (')') == MATCH_YES)
2117 goto get_io_list;
2118 if (gfc_match_char (',') != MATCH_YES)
2119 goto syntax;
2120
2121 loop:
2122 for (;;)
2123 {
2124 m = match_dt_element (k, dt);
2125 if (m == MATCH_NO)
2126 goto syntax;
2127 if (m == MATCH_ERROR)
2128 goto cleanup;
2129
2130 if (gfc_match_char (')') == MATCH_YES)
2131 break;
2132 if (gfc_match_char (',') != MATCH_YES)
2133 goto syntax;
2134 }
2135
2136 get_io_list:
2137 /* Optional leading comma (non-standard). */
2138 if (!comma_flag)
2139 gfc_match_char (',');
2140
2141 io_code = NULL;
2142 if (gfc_match_eos () != MATCH_YES)
2143 {
2144 if (comma_flag && gfc_match_char (',') != MATCH_YES)
2145 {
2146 gfc_error ("Expected comma in I/O list at %C");
2147 m = MATCH_ERROR;
2148 goto cleanup;
2149 }
2150
2151 m = match_io_list (k, &io_code);
2152 if (m == MATCH_ERROR)
2153 goto cleanup;
2154 if (m == MATCH_NO)
2155 goto syntax;
2156 }
2157
2158 /* A full IO statement has been matched. */
2159 if (dt->io_unit->expr_type == EXPR_VARIABLE
2160 && k == M_WRITE
2161 && dt->io_unit->ts.type == BT_CHARACTER
2162 && dt->io_unit->symtree->n.sym->attr.intent == INTENT_IN)
2163 {
2164 gfc_error ("Internal file '%s' at %L is INTENT(IN)",
2165 dt->io_unit->symtree->n.sym->name, &dt->io_unit->where);
2166 m = MATCH_ERROR;
2167 goto cleanup;
2168 }
2169
2170 expr = dt->format_expr;
2171
2172 if (expr != NULL && expr->expr_type == EXPR_CONSTANT)
2173 check_format_string (expr);
2174
2175 if (gfc_pure (NULL)
2176 && (k == M_READ || k == M_WRITE)
2177 && dt->io_unit->ts.type != BT_CHARACTER)
2178 {
2179 gfc_error
2180 ("io-unit in %s statement at %C must be an internal file in a "
2181 "PURE procedure", io_kind_name (k));
2182 m = MATCH_ERROR;
2183 goto cleanup;
2184 }
2185
2186 new_st.op = (k == M_READ) ? EXEC_READ : EXEC_WRITE;
2187 new_st.ext.dt = dt;
2188 new_st.next = io_code;
2189
2190 terminate_io (io_code);
2191
2192 return MATCH_YES;
2193
2194 syntax:
2195 gfc_error ("Syntax error in %s statement at %C", io_kind_name (k));
2196 m = MATCH_ERROR;
2197
2198 cleanup:
2199 gfc_free_dt (dt);
2200 return m;
2201 }
2202
2203
2204 match
2205 gfc_match_read (void)
2206 {
2207 return match_io (M_READ);
2208 }
2209
2210 match
2211 gfc_match_write (void)
2212 {
2213 return match_io (M_WRITE);
2214 }
2215
2216 match
2217 gfc_match_print (void)
2218 {
2219 match m;
2220
2221 m = match_io (M_PRINT);
2222 if (m != MATCH_YES)
2223 return m;
2224
2225 if (gfc_pure (NULL))
2226 {
2227 gfc_error ("PRINT statement at %C not allowed within PURE procedure");
2228 return MATCH_ERROR;
2229 }
2230
2231 return MATCH_YES;
2232 }
2233
2234
2235 /* Free a gfc_inquire structure. */
2236
2237 void
2238 gfc_free_inquire (gfc_inquire * inquire)
2239 {
2240
2241 if (inquire == NULL)
2242 return;
2243
2244 gfc_free_expr (inquire->unit);
2245 gfc_free_expr (inquire->file);
2246 gfc_free_expr (inquire->iostat);
2247 gfc_free_expr (inquire->exist);
2248 gfc_free_expr (inquire->opened);
2249 gfc_free_expr (inquire->number);
2250 gfc_free_expr (inquire->named);
2251 gfc_free_expr (inquire->name);
2252 gfc_free_expr (inquire->access);
2253 gfc_free_expr (inquire->sequential);
2254 gfc_free_expr (inquire->direct);
2255 gfc_free_expr (inquire->form);
2256 gfc_free_expr (inquire->formatted);
2257 gfc_free_expr (inquire->unformatted);
2258 gfc_free_expr (inquire->recl);
2259 gfc_free_expr (inquire->nextrec);
2260 gfc_free_expr (inquire->blank);
2261 gfc_free_expr (inquire->position);
2262 gfc_free_expr (inquire->action);
2263 gfc_free_expr (inquire->read);
2264 gfc_free_expr (inquire->write);
2265 gfc_free_expr (inquire->readwrite);
2266 gfc_free_expr (inquire->delim);
2267 gfc_free_expr (inquire->pad);
2268 gfc_free_expr (inquire->iolength);
2269
2270 gfc_free (inquire);
2271 }
2272
2273
2274 /* Match an element of an INQUIRE statement. */
2275
2276 #define RETM if (m != MATCH_NO) return m;
2277
2278 static match
2279 match_inquire_element (gfc_inquire * inquire)
2280 {
2281 match m;
2282
2283 m = match_etag (&tag_unit, &inquire->unit);
2284 RETM m = match_etag (&tag_file, &inquire->file);
2285 RETM m = match_ltag (&tag_err, &inquire->err);
2286 RETM m = match_vtag (&tag_iostat, &inquire->iostat);
2287 RETM m = match_vtag (&tag_exist, &inquire->exist);
2288 RETM m = match_vtag (&tag_opened, &inquire->opened);
2289 RETM m = match_vtag (&tag_named, &inquire->named);
2290 RETM m = match_vtag (&tag_name, &inquire->name);
2291 RETM m = match_vtag (&tag_number, &inquire->number);
2292 RETM m = match_vtag (&tag_s_access, &inquire->access);
2293 RETM m = match_vtag (&tag_sequential, &inquire->sequential);
2294 RETM m = match_vtag (&tag_direct, &inquire->direct);
2295 RETM m = match_vtag (&tag_s_form, &inquire->form);
2296 RETM m = match_vtag (&tag_formatted, &inquire->formatted);
2297 RETM m = match_vtag (&tag_unformatted, &inquire->unformatted);
2298 RETM m = match_vtag (&tag_s_recl, &inquire->recl);
2299 RETM m = match_vtag (&tag_nextrec, &inquire->nextrec);
2300 RETM m = match_vtag (&tag_s_blank, &inquire->blank);
2301 RETM m = match_vtag (&tag_s_position, &inquire->position);
2302 RETM m = match_vtag (&tag_s_action, &inquire->action);
2303 RETM m = match_vtag (&tag_read, &inquire->read);
2304 RETM m = match_vtag (&tag_write, &inquire->write);
2305 RETM m = match_vtag (&tag_readwrite, &inquire->readwrite);
2306 RETM m = match_vtag (&tag_s_delim, &inquire->delim);
2307 RETM m = match_vtag (&tag_s_pad, &inquire->pad);
2308 RETM m = match_vtag (&tag_iolength, &inquire->iolength);
2309 RETM return MATCH_NO;
2310 }
2311
2312 #undef RETM
2313
2314
2315 match
2316 gfc_match_inquire (void)
2317 {
2318 gfc_inquire *inquire;
2319 gfc_code *code;
2320 match m;
2321
2322 m = gfc_match_char ('(');
2323 if (m == MATCH_NO)
2324 return m;
2325
2326 inquire = gfc_getmem (sizeof (gfc_inquire));
2327
2328 m = match_inquire_element (inquire);
2329 if (m == MATCH_ERROR)
2330 goto cleanup;
2331 if (m == MATCH_NO)
2332 {
2333 m = gfc_match_expr (&inquire->unit);
2334 if (m == MATCH_ERROR)
2335 goto cleanup;
2336 if (m == MATCH_NO)
2337 goto syntax;
2338 }
2339
2340 /* See if we have the IOLENGTH form of the inquire statement. */
2341 if (inquire->iolength != NULL)
2342 {
2343 if (gfc_match_char (')') != MATCH_YES)
2344 goto syntax;
2345
2346 m = match_io_list (M_INQUIRE, &code);
2347 if (m == MATCH_ERROR)
2348 goto cleanup;
2349 if (m == MATCH_NO)
2350 goto syntax;
2351
2352 terminate_io (code);
2353
2354 new_st.op = EXEC_IOLENGTH;
2355 new_st.expr = inquire->iolength;
2356 new_st.ext.inquire = inquire;
2357
2358 if (gfc_pure (NULL))
2359 {
2360 gfc_free_statements (code);
2361 gfc_error ("INQUIRE statement not allowed in PURE procedure at %C");
2362 return MATCH_ERROR;
2363 }
2364
2365 new_st.next = code;
2366 return MATCH_YES;
2367 }
2368
2369 /* At this point, we have the non-IOLENGTH inquire statement. */
2370 for (;;)
2371 {
2372 if (gfc_match_char (')') == MATCH_YES)
2373 break;
2374 if (gfc_match_char (',') != MATCH_YES)
2375 goto syntax;
2376
2377 m = match_inquire_element (inquire);
2378 if (m == MATCH_ERROR)
2379 goto cleanup;
2380 if (m == MATCH_NO)
2381 goto syntax;
2382
2383 if (inquire->iolength != NULL)
2384 {
2385 gfc_error ("IOLENGTH tag invalid in INQUIRE statement at %C");
2386 goto cleanup;
2387 }
2388 }
2389
2390 if (gfc_match_eos () != MATCH_YES)
2391 goto syntax;
2392
2393 if (gfc_pure (NULL))
2394 {
2395 gfc_error ("INQUIRE statement not allowed in PURE procedure at %C");
2396 goto cleanup;
2397 }
2398
2399 new_st.op = EXEC_INQUIRE;
2400 new_st.ext.inquire = inquire;
2401 return MATCH_YES;
2402
2403 syntax:
2404 gfc_syntax_error (ST_INQUIRE);
2405
2406 cleanup:
2407 gfc_free_inquire (inquire);
2408 return MATCH_ERROR;
2409 }
2410
2411
2412 /* Resolve everything in a gfc_inquire structure. */
2413
2414 try
2415 gfc_resolve_inquire (gfc_inquire * inquire)
2416 {
2417
2418 RESOLVE_TAG (&tag_unit, inquire->unit);
2419 RESOLVE_TAG (&tag_file, inquire->file);
2420 RESOLVE_TAG (&tag_iostat, inquire->iostat);
2421 RESOLVE_TAG (&tag_exist, inquire->exist);
2422 RESOLVE_TAG (&tag_opened, inquire->opened);
2423 RESOLVE_TAG (&tag_number, inquire->number);
2424 RESOLVE_TAG (&tag_named, inquire->named);
2425 RESOLVE_TAG (&tag_name, inquire->name);
2426 RESOLVE_TAG (&tag_s_access, inquire->access);
2427 RESOLVE_TAG (&tag_sequential, inquire->sequential);
2428 RESOLVE_TAG (&tag_direct, inquire->direct);
2429 RESOLVE_TAG (&tag_s_form, inquire->form);
2430 RESOLVE_TAG (&tag_formatted, inquire->formatted);
2431 RESOLVE_TAG (&tag_unformatted, inquire->unformatted);
2432 RESOLVE_TAG (&tag_s_recl, inquire->recl);
2433 RESOLVE_TAG (&tag_nextrec, inquire->nextrec);
2434 RESOLVE_TAG (&tag_s_blank, inquire->blank);
2435 RESOLVE_TAG (&tag_s_position, inquire->position);
2436 RESOLVE_TAG (&tag_s_action, inquire->action);
2437 RESOLVE_TAG (&tag_read, inquire->read);
2438 RESOLVE_TAG (&tag_write, inquire->write);
2439 RESOLVE_TAG (&tag_readwrite, inquire->readwrite);
2440 RESOLVE_TAG (&tag_s_delim, inquire->delim);
2441 RESOLVE_TAG (&tag_s_pad, inquire->pad);
2442 RESOLVE_TAG (&tag_iolength, inquire->iolength);
2443
2444 if (gfc_reference_st_label (inquire->err, ST_LABEL_TARGET) == FAILURE)
2445 return FAILURE;
2446
2447 return SUCCESS;
2448 }
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