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cp-tree.def (UNARY_PLUS_EXPR): New C++ unary tree code.
[gcc.git] / gcc / fortran / io.c
1 /* Deal with I/O statements & related stuff.
2 Copyright (C) 2000, 2001, 2002, 2003, 2004, 2005 Free Software Foundation,
3 Inc.
4 Contributed by Andy Vaught
5
6 This file is part of GCC.
7
8 GCC is free software; you can redistribute it and/or modify it under
9 the terms of the GNU General Public License as published by the Free
10 Software Foundation; either version 2, or (at your option) any later
11 version.
12
13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
16 for more details.
17
18 You should have received a copy of the GNU General Public License
19 along with GCC; see the file COPYING. If not, write to the Free
20 Software Foundation, 59 Temple Place - Suite 330, Boston, MA
21 02111-1307, USA. */
22
23 #include "config.h"
24 #include "system.h"
25 #include "flags.h"
26 #include "gfortran.h"
27 #include "match.h"
28 #include "parse.h"
29
30 gfc_st_label format_asterisk =
31 { -1, ST_LABEL_FORMAT, ST_LABEL_FORMAT, NULL, 0,
32 {NULL, NULL}, NULL, NULL};
33
34 typedef struct
35 {
36 const char *name, *spec;
37 bt type;
38 }
39 io_tag;
40
41 static const io_tag
42 tag_file = { "FILE", " file = %e", BT_CHARACTER },
43 tag_status = { "STATUS", " status = %e", BT_CHARACTER},
44 tag_e_access = {"ACCESS", " access = %e", BT_CHARACTER},
45 tag_e_form = {"FORM", " form = %e", BT_CHARACTER},
46 tag_e_recl = {"RECL", " recl = %e", BT_INTEGER},
47 tag_e_blank = {"BLANK", " blank = %e", BT_CHARACTER},
48 tag_e_position = {"POSITION", " position = %e", BT_CHARACTER},
49 tag_e_action = {"ACTION", " action = %e", BT_CHARACTER},
50 tag_e_delim = {"DELIM", " delim = %e", BT_CHARACTER},
51 tag_e_pad = {"PAD", " pad = %e", BT_CHARACTER},
52 tag_unit = {"UNIT", " unit = %e", BT_INTEGER},
53 tag_advance = {"ADVANCE", " advance = %e", BT_CHARACTER},
54 tag_rec = {"REC", " rec = %e", BT_INTEGER},
55 tag_format = {"FORMAT", NULL, BT_CHARACTER},
56 tag_iostat = {"IOSTAT", " iostat = %v", BT_INTEGER},
57 tag_size = {"SIZE", " size = %v", BT_INTEGER},
58 tag_exist = {"EXIST", " exist = %v", BT_LOGICAL},
59 tag_opened = {"OPENED", " opened = %v", BT_LOGICAL},
60 tag_named = {"NAMED", " named = %v", BT_LOGICAL},
61 tag_name = {"NAME", " name = %v", BT_CHARACTER},
62 tag_number = {"NUMBER", " number = %v", BT_INTEGER},
63 tag_s_access = {"ACCESS", " access = %v", BT_CHARACTER},
64 tag_sequential = {"SEQUENTIAL", " sequential = %v", BT_CHARACTER},
65 tag_direct = {"DIRECT", " direct = %v", BT_CHARACTER},
66 tag_s_form = {"FORM", " form = %v", BT_CHARACTER},
67 tag_formatted = {"FORMATTED", " formatted = %v", BT_CHARACTER},
68 tag_unformatted = {"UNFORMATTED", " unformatted = %v", BT_CHARACTER},
69 tag_s_recl = {"RECL", " recl = %v", BT_INTEGER},
70 tag_nextrec = {"NEXTREC", " nextrec = %v", BT_INTEGER},
71 tag_s_blank = {"BLANK", " blank = %v", BT_CHARACTER},
72 tag_s_position = {"POSITION", " position = %v", BT_CHARACTER},
73 tag_s_action = {"ACTION", " action = %v", BT_CHARACTER},
74 tag_read = {"READ", " read = %v", BT_CHARACTER},
75 tag_write = {"WRITE", " write = %v", BT_CHARACTER},
76 tag_readwrite = {"READWRITE", " readwrite = %v", BT_CHARACTER},
77 tag_s_delim = {"DELIM", " delim = %v", BT_CHARACTER},
78 tag_s_pad = {"PAD", " pad = %v", BT_CHARACTER},
79 tag_iolength = {"IOLENGTH", " iolength = %v", BT_INTEGER},
80 tag_err = {"ERR", " err = %l", BT_UNKNOWN},
81 tag_end = {"END", " end = %l", BT_UNKNOWN},
82 tag_eor = {"EOR", " eor = %l", BT_UNKNOWN};
83
84 static gfc_dt *current_dt;
85
86 #define RESOLVE_TAG(x, y) if (resolve_tag(x, y) == FAILURE) return FAILURE;
87
88
89 /**************** Fortran 95 FORMAT parser *****************/
90
91 /* FORMAT tokens returned by format_lex(). */
92 typedef enum
93 {
94 FMT_NONE, FMT_UNKNOWN, FMT_SIGNED_INT, FMT_ZERO, FMT_POSINT, FMT_PERIOD,
95 FMT_COMMA, FMT_COLON, FMT_SLASH, FMT_DOLLAR, FMT_POS, FMT_LPAREN,
96 FMT_RPAREN, FMT_X, FMT_SIGN, FMT_BLANK, FMT_CHAR, FMT_P, FMT_IBOZ, FMT_F,
97 FMT_E, FMT_EXT, FMT_G, FMT_L, FMT_A, FMT_D, FMT_H, FMT_END
98 }
99 format_token;
100
101 /* Local variables for checking format strings. The saved_token is
102 used to back up by a single format token during the parsing
103 process. */
104 static char *format_string;
105 static int format_length, use_last_char;
106
107 static format_token saved_token;
108
109 static enum
110 { MODE_STRING, MODE_FORMAT, MODE_COPY }
111 mode;
112
113
114 /* Return the next character in the format string. */
115
116 static char
117 next_char (int in_string)
118 {
119 static char c;
120
121 if (use_last_char)
122 {
123 use_last_char = 0;
124 return c;
125 }
126
127 format_length++;
128
129 if (mode == MODE_STRING)
130 c = *format_string++;
131 else
132 {
133 c = gfc_next_char_literal (in_string);
134 if (c == '\n')
135 c = '\0';
136
137 if (mode == MODE_COPY)
138 *format_string++ = c;
139 }
140
141 c = TOUPPER (c);
142 return c;
143 }
144
145
146 /* Back up one character position. Only works once. */
147
148 static void
149 unget_char (void)
150 {
151
152 use_last_char = 1;
153 }
154
155 static int value = 0;
156
157 /* Simple lexical analyzer for getting the next token in a FORMAT
158 statement. */
159
160 static format_token
161 format_lex (void)
162 {
163 format_token token;
164 char c, delim;
165 int zflag;
166 int negative_flag;
167
168 if (saved_token != FMT_NONE)
169 {
170 token = saved_token;
171 saved_token = FMT_NONE;
172 return token;
173 }
174
175 do
176 {
177 c = next_char (0);
178 }
179 while (gfc_is_whitespace (c));
180
181 negative_flag = 0;
182 switch (c)
183 {
184 case '-':
185 negative_flag = 1;
186 case '+':
187 c = next_char (0);
188 if (!ISDIGIT (c))
189 {
190 token = FMT_UNKNOWN;
191 break;
192 }
193
194 value = c - '0';
195
196 do
197 {
198 c = next_char (0);
199 if(ISDIGIT (c))
200 value = 10 * value + c - '0';
201 }
202 while (ISDIGIT (c));
203
204 unget_char ();
205
206 if (negative_flag)
207 value = -value;
208
209 token = FMT_SIGNED_INT;
210 break;
211
212 case '0':
213 case '1':
214 case '2':
215 case '3':
216 case '4':
217 case '5':
218 case '6':
219 case '7':
220 case '8':
221 case '9':
222 zflag = (c == '0');
223
224 value = c - '0';
225
226 do
227 {
228 c = next_char (0);
229 if (c != '0')
230 zflag = 0;
231 if (ISDIGIT (c))
232 value = 10 * value + c - '0';
233 }
234 while (ISDIGIT (c));
235
236 unget_char ();
237 token = zflag ? FMT_ZERO : FMT_POSINT;
238 break;
239
240 case '.':
241 token = FMT_PERIOD;
242 break;
243
244 case ',':
245 token = FMT_COMMA;
246 break;
247
248 case ':':
249 token = FMT_COLON;
250 break;
251
252 case '/':
253 token = FMT_SLASH;
254 break;
255
256 case '$':
257 token = FMT_DOLLAR;
258 break;
259
260 case 'T':
261 c = next_char (0);
262 if (c != 'L' && c != 'R')
263 unget_char ();
264
265 token = FMT_POS;
266 break;
267
268 case '(':
269 token = FMT_LPAREN;
270 break;
271
272 case ')':
273 token = FMT_RPAREN;
274 break;
275
276 case 'X':
277 token = FMT_X;
278 break;
279
280 case 'S':
281 c = next_char (0);
282 if (c != 'P' && c != 'S')
283 unget_char ();
284
285 token = FMT_SIGN;
286 break;
287
288 case 'B':
289 c = next_char (0);
290 if (c == 'N' || c == 'Z')
291 token = FMT_BLANK;
292 else
293 {
294 unget_char ();
295 token = FMT_IBOZ;
296 }
297
298 break;
299
300 case '\'':
301 case '"':
302 delim = c;
303
304 value = 0;
305
306 for (;;)
307 {
308 c = next_char (1);
309 if (c == '\0')
310 {
311 token = FMT_END;
312 break;
313 }
314
315 if (c == delim)
316 {
317 c = next_char (1);
318
319 if (c == '\0')
320 {
321 token = FMT_END;
322 break;
323 }
324
325 if (c != delim)
326 {
327 unget_char ();
328 token = FMT_CHAR;
329 break;
330 }
331 }
332 value++;
333 }
334 break;
335
336 case 'P':
337 token = FMT_P;
338 break;
339
340 case 'I':
341 case 'O':
342 case 'Z':
343 token = FMT_IBOZ;
344 break;
345
346 case 'F':
347 token = FMT_F;
348 break;
349
350 case 'E':
351 c = next_char (0);
352 if (c == 'N' || c == 'S')
353 token = FMT_EXT;
354 else
355 {
356 token = FMT_E;
357 unget_char ();
358 }
359
360 break;
361
362 case 'G':
363 token = FMT_G;
364 break;
365
366 case 'H':
367 token = FMT_H;
368 break;
369
370 case 'L':
371 token = FMT_L;
372 break;
373
374 case 'A':
375 token = FMT_A;
376 break;
377
378 case 'D':
379 token = FMT_D;
380 break;
381
382 case '\0':
383 token = FMT_END;
384 break;
385
386 default:
387 token = FMT_UNKNOWN;
388 break;
389 }
390
391 return token;
392 }
393
394
395 /* Check a format statement. The format string, either from a FORMAT
396 statement or a constant in an I/O statement has already been parsed
397 by itself, and we are checking it for validity. The dual origin
398 means that the warning message is a little less than great. */
399
400 static try
401 check_format (void)
402 {
403 const char *posint_required = "Positive width required";
404 const char *period_required = "Period required";
405 const char *nonneg_required = "Nonnegative width required";
406 const char *unexpected_element = "Unexpected element";
407 const char *unexpected_end = "Unexpected end of format string";
408
409 const char *error;
410 format_token t, u;
411 int level;
412 int repeat;
413 try rv;
414
415 use_last_char = 0;
416 saved_token = FMT_NONE;
417 level = 0;
418 repeat = 0;
419 rv = SUCCESS;
420
421 t = format_lex ();
422 if (t != FMT_LPAREN)
423 {
424 error = "Missing leading left parenthesis";
425 goto syntax;
426 }
427
428 t = format_lex ();
429 if (t == FMT_RPAREN)
430 goto finished; /* Empty format is legal */
431 saved_token = t;
432
433 format_item:
434 /* In this state, the next thing has to be a format item. */
435 t = format_lex ();
436 format_item_1:
437 switch (t)
438 {
439 case FMT_POSINT:
440 repeat = value;
441 t = format_lex ();
442 if (t == FMT_LPAREN)
443 {
444 level++;
445 goto format_item;
446 }
447
448 if (t == FMT_SLASH)
449 goto optional_comma;
450
451 goto data_desc;
452
453 case FMT_LPAREN:
454 level++;
455 goto format_item;
456
457 case FMT_SIGNED_INT:
458 /* Signed integer can only precede a P format. */
459 t = format_lex ();
460 if (t != FMT_P)
461 {
462 error = "Expected P edit descriptor";
463 goto syntax;
464 }
465
466 goto data_desc;
467
468 case FMT_P:
469 /* P requires a prior number. */
470 error = "P descriptor requires leading scale factor";
471 goto syntax;
472
473 case FMT_X:
474 /* X requires a prior number if we're being pedantic. */
475 if (gfc_notify_std (GFC_STD_GNU, "Extension: X descriptor "
476 "requires leading space count at %C")
477 == FAILURE)
478 return FAILURE;
479 goto between_desc;
480
481 case FMT_SIGN:
482 case FMT_BLANK:
483 goto between_desc;
484
485 case FMT_CHAR:
486 goto extension_optional_comma;
487
488 case FMT_COLON:
489 case FMT_SLASH:
490 goto optional_comma;
491
492 case FMT_DOLLAR:
493 t = format_lex ();
494 if (t != FMT_RPAREN || level > 0)
495 {
496 error = "$ must the last specifier";
497 goto syntax;
498 }
499
500 goto finished;
501
502 case FMT_POS:
503 case FMT_IBOZ:
504 case FMT_F:
505 case FMT_E:
506 case FMT_EXT:
507 case FMT_G:
508 case FMT_L:
509 case FMT_A:
510 case FMT_D:
511 goto data_desc;
512
513 case FMT_H:
514 goto data_desc;
515
516 case FMT_END:
517 error = unexpected_end;
518 goto syntax;
519
520 default:
521 error = unexpected_element;
522 goto syntax;
523 }
524
525 data_desc:
526 /* In this state, t must currently be a data descriptor.
527 Deal with things that can/must follow the descriptor. */
528 switch (t)
529 {
530 case FMT_SIGN:
531 case FMT_BLANK:
532 case FMT_X:
533 break;
534
535 case FMT_P:
536 if (pedantic)
537 {
538 t = format_lex ();
539 if (t == FMT_POSINT)
540 {
541 error = "Repeat count cannot follow P descriptor";
542 goto syntax;
543 }
544
545 saved_token = t;
546 }
547
548 goto optional_comma;
549
550 case FMT_POS:
551 case FMT_L:
552 t = format_lex ();
553 if (t == FMT_POSINT)
554 break;
555
556 error = posint_required;
557 goto syntax;
558
559 case FMT_A:
560 t = format_lex ();
561 if (t != FMT_POSINT)
562 saved_token = t;
563 break;
564
565 case FMT_D:
566 case FMT_E:
567 case FMT_G:
568 case FMT_EXT:
569 u = format_lex ();
570 if (u != FMT_POSINT)
571 {
572 error = posint_required;
573 goto syntax;
574 }
575
576 u = format_lex ();
577 if (u != FMT_PERIOD)
578 {
579 error = period_required;
580 goto syntax;
581 }
582
583 u = format_lex ();
584 if (u != FMT_ZERO && u != FMT_POSINT)
585 {
586 error = nonneg_required;
587 goto syntax;
588 }
589
590 if (t == FMT_D)
591 break;
592
593 /* Look for optional exponent. */
594 u = format_lex ();
595 if (u != FMT_E)
596 {
597 saved_token = u;
598 }
599 else
600 {
601 u = format_lex ();
602 if (u != FMT_POSINT)
603 {
604 error = "Positive exponent width required";
605 goto syntax;
606 }
607 }
608
609 break;
610
611 case FMT_F:
612 t = format_lex ();
613 if (t != FMT_ZERO && t != FMT_POSINT)
614 {
615 error = nonneg_required;
616 goto syntax;
617 }
618
619 t = format_lex ();
620 if (t != FMT_PERIOD)
621 {
622 error = period_required;
623 goto syntax;
624 }
625
626 t = format_lex ();
627 if (t != FMT_ZERO && t != FMT_POSINT)
628 {
629 error = nonneg_required;
630 goto syntax;
631 }
632
633 break;
634
635 case FMT_H:
636 if(mode == MODE_STRING)
637 {
638 format_string += value;
639 format_length -= value;
640 }
641 else
642 {
643 while(repeat >0)
644 {
645 next_char(1);
646 repeat -- ;
647 }
648 }
649 break;
650
651 case FMT_IBOZ:
652 t = format_lex ();
653 if (t != FMT_ZERO && t != FMT_POSINT)
654 {
655 error = nonneg_required;
656 goto syntax;
657 }
658
659 t = format_lex ();
660 if (t != FMT_PERIOD)
661 {
662 saved_token = t;
663 }
664 else
665 {
666 t = format_lex ();
667 if (t != FMT_ZERO && t != FMT_POSINT)
668 {
669 error = nonneg_required;
670 goto syntax;
671 }
672 }
673
674 break;
675
676 default:
677 error = unexpected_element;
678 goto syntax;
679 }
680
681 between_desc:
682 /* Between a descriptor and what comes next. */
683 t = format_lex ();
684 switch (t)
685 {
686
687 case FMT_COMMA:
688 goto format_item;
689
690 case FMT_RPAREN:
691 level--;
692 if (level < 0)
693 goto finished;
694 goto between_desc;
695
696 case FMT_COLON:
697 case FMT_SLASH:
698 goto optional_comma;
699
700 case FMT_END:
701 error = unexpected_end;
702 goto syntax;
703
704 default:
705 if (gfc_notify_std (GFC_STD_GNU, "Extension: Missing comma at %C")
706 == FAILURE)
707 return FAILURE;
708 goto format_item_1;
709 }
710
711 optional_comma:
712 /* Optional comma is a weird between state where we've just finished
713 reading a colon, slash or P descriptor. */
714 t = format_lex ();
715 switch (t)
716 {
717 case FMT_COMMA:
718 break;
719
720 case FMT_RPAREN:
721 level--;
722 if (level < 0)
723 goto finished;
724 goto between_desc;
725
726 default:
727 /* Assume that we have another format item. */
728 saved_token = t;
729 break;
730 }
731
732 goto format_item;
733
734 extension_optional_comma:
735 /* As a GNU extension, permit a missing comma after a string literal. */
736 t = format_lex ();
737 switch (t)
738 {
739 case FMT_COMMA:
740 break;
741
742 case FMT_RPAREN:
743 level--;
744 if (level < 0)
745 goto finished;
746 goto between_desc;
747
748 case FMT_COLON:
749 case FMT_SLASH:
750 goto optional_comma;
751
752 case FMT_END:
753 error = unexpected_end;
754 goto syntax;
755
756 default:
757 if (gfc_notify_std (GFC_STD_GNU, "Extension: Missing comma at %C")
758 == FAILURE)
759 return FAILURE;
760 saved_token = t;
761 break;
762 }
763
764 goto format_item;
765
766 syntax:
767 /* Something went wrong. If the format we're checking is a string,
768 generate a warning, since the program is correct. If the format
769 is in a FORMAT statement, this messes up parsing, which is an
770 error. */
771 if (mode != MODE_STRING)
772 gfc_error ("%s in format string at %C", error);
773 else
774 {
775 gfc_warning ("%s in format string at %C", error);
776
777 /* TODO: More elaborate measures are needed to show where a problem
778 is within a format string that has been calculated. */
779 }
780
781 rv = FAILURE;
782
783 finished:
784 return rv;
785 }
786
787
788 /* Given an expression node that is a constant string, see if it looks
789 like a format string. */
790
791 static void
792 check_format_string (gfc_expr * e)
793 {
794
795 mode = MODE_STRING;
796 format_string = e->value.character.string;
797 check_format ();
798 }
799
800
801 /************ Fortran 95 I/O statement matchers *************/
802
803 /* Match a FORMAT statement. This amounts to actually parsing the
804 format descriptors in order to correctly locate the end of the
805 format string. */
806
807 match
808 gfc_match_format (void)
809 {
810 gfc_expr *e;
811 locus start;
812
813 if (gfc_statement_label == NULL)
814 {
815 gfc_error ("Missing format label at %C");
816 return MATCH_ERROR;
817 }
818 gfc_gobble_whitespace ();
819
820 mode = MODE_FORMAT;
821 format_length = 0;
822
823 start = gfc_current_locus;
824
825 if (check_format () == FAILURE)
826 return MATCH_ERROR;
827
828 if (gfc_match_eos () != MATCH_YES)
829 {
830 gfc_syntax_error (ST_FORMAT);
831 return MATCH_ERROR;
832 }
833
834 /* The label doesn't get created until after the statement is done
835 being matched, so we have to leave the string for later. */
836
837 gfc_current_locus = start; /* Back to the beginning */
838
839 new_st.loc = start;
840 new_st.op = EXEC_NOP;
841
842 e = gfc_get_expr();
843 e->expr_type = EXPR_CONSTANT;
844 e->ts.type = BT_CHARACTER;
845 e->ts.kind = gfc_default_character_kind;
846 e->where = start;
847 e->value.character.string = format_string = gfc_getmem(format_length+1);
848 e->value.character.length = format_length;
849 gfc_statement_label->format = e;
850
851 mode = MODE_COPY;
852 check_format (); /* Guaranteed to succeed */
853 gfc_match_eos (); /* Guaranteed to succeed */
854
855 return MATCH_YES;
856 }
857
858
859 /* Match an expression I/O tag of some sort. */
860
861 static match
862 match_etag (const io_tag * tag, gfc_expr ** v)
863 {
864 gfc_expr *result;
865 match m;
866
867 m = gfc_match (tag->spec, &result);
868 if (m != MATCH_YES)
869 return m;
870
871 if (*v != NULL)
872 {
873 gfc_error ("Duplicate %s specification at %C", tag->name);
874 gfc_free_expr (result);
875 return MATCH_ERROR;
876 }
877
878 *v = result;
879 return MATCH_YES;
880 }
881
882
883 /* Match a variable I/O tag of some sort. */
884
885 static match
886 match_vtag (const io_tag * tag, gfc_expr ** v)
887 {
888 gfc_expr *result;
889 match m;
890
891 m = gfc_match (tag->spec, &result);
892 if (m != MATCH_YES)
893 return m;
894
895 if (*v != NULL)
896 {
897 gfc_error ("Duplicate %s specification at %C", tag->name);
898 gfc_free_expr (result);
899 return MATCH_ERROR;
900 }
901
902 if (result->symtree->n.sym->attr.intent == INTENT_IN)
903 {
904 gfc_error ("Variable tag cannot be INTENT(IN) at %C");
905 gfc_free_expr (result);
906 return MATCH_ERROR;
907 }
908
909 if (gfc_pure (NULL) && gfc_impure_variable (result->symtree->n.sym))
910 {
911 gfc_error ("Variable tag cannot be assigned in PURE procedure at %C");
912 gfc_free_expr (result);
913 return MATCH_ERROR;
914 }
915
916 *v = result;
917 return MATCH_YES;
918 }
919
920
921 /* Match I/O tags that cause variables to become redefined. */
922
923 static match
924 match_out_tag(const io_tag *tag, gfc_expr **result)
925 {
926 match m;
927
928 m = match_vtag(tag, result);
929 if (m == MATCH_YES)
930 gfc_check_do_variable((*result)->symtree);
931
932 return m;
933 }
934
935
936 /* Match a label I/O tag. */
937
938 static match
939 match_ltag (const io_tag * tag, gfc_st_label ** label)
940 {
941 match m;
942 gfc_st_label *old;
943
944 old = *label;
945 m = gfc_match (tag->spec, label);
946 if (m == MATCH_YES && old != 0)
947 {
948 gfc_error ("Duplicate %s label specification at %C", tag->name);
949 return MATCH_ERROR;
950 }
951
952 return m;
953 }
954
955
956 /* Do expression resolution and type-checking on an expression tag. */
957
958 static try
959 resolve_tag (const io_tag * tag, gfc_expr * e)
960 {
961
962 if (e == NULL)
963 return SUCCESS;
964
965 if (gfc_resolve_expr (e) == FAILURE)
966 return FAILURE;
967
968 if (e->ts.type != tag->type)
969 {
970 /* Format label can be integer varibale. */
971 if (tag != &tag_format || e->ts.type != BT_INTEGER)
972 {
973 gfc_error ("%s tag at %L must be of type %s", tag->name, &e->where,
974 gfc_basic_typename (tag->type));
975 return FAILURE;
976 }
977 }
978
979 if (tag == &tag_format)
980 {
981 if (e->rank != 1 && e->rank != 0)
982 {
983 gfc_error ("FORMAT tag at %L cannot be array of strings",
984 &e->where);
985 return FAILURE;
986 }
987 /* Check assigned label. */
988 if (e->expr_type == EXPR_VARIABLE && e->ts.type == BT_INTEGER
989 && e->symtree->n.sym->attr.assign != 1)
990 {
991 gfc_error ("Variable '%s' has not been assigned a format label at %L",
992 e->symtree->n.sym->name, &e->where);
993 return FAILURE;
994 }
995 }
996 else
997 {
998 if (e->rank != 0)
999 {
1000 gfc_error ("%s tag at %L must be scalar", tag->name, &e->where);
1001 return FAILURE;
1002 }
1003 }
1004
1005 return SUCCESS;
1006 }
1007
1008
1009 /* Match a single tag of an OPEN statement. */
1010
1011 static match
1012 match_open_element (gfc_open * open)
1013 {
1014 match m;
1015
1016 m = match_etag (&tag_unit, &open->unit);
1017 if (m != MATCH_NO)
1018 return m;
1019 m = match_out_tag (&tag_iostat, &open->iostat);
1020 if (m != MATCH_NO)
1021 return m;
1022 m = match_etag (&tag_file, &open->file);
1023 if (m != MATCH_NO)
1024 return m;
1025 m = match_etag (&tag_status, &open->status);
1026 if (m != MATCH_NO)
1027 return m;
1028 m = match_etag (&tag_e_access, &open->access);
1029 if (m != MATCH_NO)
1030 return m;
1031 m = match_etag (&tag_e_form, &open->form);
1032 if (m != MATCH_NO)
1033 return m;
1034 m = match_etag (&tag_e_recl, &open->recl);
1035 if (m != MATCH_NO)
1036 return m;
1037 m = match_etag (&tag_e_blank, &open->blank);
1038 if (m != MATCH_NO)
1039 return m;
1040 m = match_etag (&tag_e_position, &open->position);
1041 if (m != MATCH_NO)
1042 return m;
1043 m = match_etag (&tag_e_action, &open->action);
1044 if (m != MATCH_NO)
1045 return m;
1046 m = match_etag (&tag_e_delim, &open->delim);
1047 if (m != MATCH_NO)
1048 return m;
1049 m = match_etag (&tag_e_pad, &open->pad);
1050 if (m != MATCH_NO)
1051 return m;
1052 m = match_ltag (&tag_err, &open->err);
1053 if (m != MATCH_NO)
1054 return m;
1055
1056 return MATCH_NO;
1057 }
1058
1059
1060 /* Free the gfc_open structure and all the expressions it contains. */
1061
1062 void
1063 gfc_free_open (gfc_open * open)
1064 {
1065
1066 if (open == NULL)
1067 return;
1068
1069 gfc_free_expr (open->unit);
1070 gfc_free_expr (open->iostat);
1071 gfc_free_expr (open->file);
1072 gfc_free_expr (open->status);
1073 gfc_free_expr (open->access);
1074 gfc_free_expr (open->form);
1075 gfc_free_expr (open->recl);
1076 gfc_free_expr (open->blank);
1077 gfc_free_expr (open->position);
1078 gfc_free_expr (open->action);
1079 gfc_free_expr (open->delim);
1080 gfc_free_expr (open->pad);
1081
1082 gfc_free (open);
1083 }
1084
1085
1086 /* Resolve everything in a gfc_open structure. */
1087
1088 try
1089 gfc_resolve_open (gfc_open * open)
1090 {
1091
1092 RESOLVE_TAG (&tag_unit, open->unit);
1093 RESOLVE_TAG (&tag_iostat, open->iostat);
1094 RESOLVE_TAG (&tag_file, open->file);
1095 RESOLVE_TAG (&tag_status, open->status);
1096 RESOLVE_TAG (&tag_e_form, open->form);
1097 RESOLVE_TAG (&tag_e_recl, open->recl);
1098
1099 RESOLVE_TAG (&tag_e_blank, open->blank);
1100 RESOLVE_TAG (&tag_e_position, open->position);
1101 RESOLVE_TAG (&tag_e_action, open->action);
1102 RESOLVE_TAG (&tag_e_delim, open->delim);
1103 RESOLVE_TAG (&tag_e_pad, open->pad);
1104
1105 if (gfc_reference_st_label (open->err, ST_LABEL_TARGET) == FAILURE)
1106 return FAILURE;
1107
1108 return SUCCESS;
1109 }
1110
1111
1112 /* Match an OPEN statement. */
1113
1114 match
1115 gfc_match_open (void)
1116 {
1117 gfc_open *open;
1118 match m;
1119
1120 m = gfc_match_char ('(');
1121 if (m == MATCH_NO)
1122 return m;
1123
1124 open = gfc_getmem (sizeof (gfc_open));
1125
1126 m = match_open_element (open);
1127
1128 if (m == MATCH_ERROR)
1129 goto cleanup;
1130 if (m == MATCH_NO)
1131 {
1132 m = gfc_match_expr (&open->unit);
1133 if (m == MATCH_NO)
1134 goto syntax;
1135 if (m == MATCH_ERROR)
1136 goto cleanup;
1137 }
1138
1139 for (;;)
1140 {
1141 if (gfc_match_char (')') == MATCH_YES)
1142 break;
1143 if (gfc_match_char (',') != MATCH_YES)
1144 goto syntax;
1145
1146 m = match_open_element (open);
1147 if (m == MATCH_ERROR)
1148 goto cleanup;
1149 if (m == MATCH_NO)
1150 goto syntax;
1151 }
1152
1153 if (gfc_match_eos () == MATCH_NO)
1154 goto syntax;
1155
1156 if (gfc_pure (NULL))
1157 {
1158 gfc_error ("OPEN statement not allowed in PURE procedure at %C");
1159 goto cleanup;
1160 }
1161
1162 new_st.op = EXEC_OPEN;
1163 new_st.ext.open = open;
1164 return MATCH_YES;
1165
1166 syntax:
1167 gfc_syntax_error (ST_OPEN);
1168
1169 cleanup:
1170 gfc_free_open (open);
1171 return MATCH_ERROR;
1172 }
1173
1174
1175 /* Free a gfc_close structure an all its expressions. */
1176
1177 void
1178 gfc_free_close (gfc_close * close)
1179 {
1180
1181 if (close == NULL)
1182 return;
1183
1184 gfc_free_expr (close->unit);
1185 gfc_free_expr (close->iostat);
1186 gfc_free_expr (close->status);
1187
1188 gfc_free (close);
1189 }
1190
1191
1192 /* Match elements of a CLOSE statement. */
1193
1194 static match
1195 match_close_element (gfc_close * close)
1196 {
1197 match m;
1198
1199 m = match_etag (&tag_unit, &close->unit);
1200 if (m != MATCH_NO)
1201 return m;
1202 m = match_etag (&tag_status, &close->status);
1203 if (m != MATCH_NO)
1204 return m;
1205 m = match_out_tag (&tag_iostat, &close->iostat);
1206 if (m != MATCH_NO)
1207 return m;
1208 m = match_ltag (&tag_err, &close->err);
1209 if (m != MATCH_NO)
1210 return m;
1211
1212 return MATCH_NO;
1213 }
1214
1215
1216 /* Match a CLOSE statement. */
1217
1218 match
1219 gfc_match_close (void)
1220 {
1221 gfc_close *close;
1222 match m;
1223
1224 m = gfc_match_char ('(');
1225 if (m == MATCH_NO)
1226 return m;
1227
1228 close = gfc_getmem (sizeof (gfc_close));
1229
1230 m = match_close_element (close);
1231
1232 if (m == MATCH_ERROR)
1233 goto cleanup;
1234 if (m == MATCH_NO)
1235 {
1236 m = gfc_match_expr (&close->unit);
1237 if (m == MATCH_NO)
1238 goto syntax;
1239 if (m == MATCH_ERROR)
1240 goto cleanup;
1241 }
1242
1243 for (;;)
1244 {
1245 if (gfc_match_char (')') == MATCH_YES)
1246 break;
1247 if (gfc_match_char (',') != MATCH_YES)
1248 goto syntax;
1249
1250 m = match_close_element (close);
1251 if (m == MATCH_ERROR)
1252 goto cleanup;
1253 if (m == MATCH_NO)
1254 goto syntax;
1255 }
1256
1257 if (gfc_match_eos () == MATCH_NO)
1258 goto syntax;
1259
1260 if (gfc_pure (NULL))
1261 {
1262 gfc_error ("CLOSE statement not allowed in PURE procedure at %C");
1263 goto cleanup;
1264 }
1265
1266 new_st.op = EXEC_CLOSE;
1267 new_st.ext.close = close;
1268 return MATCH_YES;
1269
1270 syntax:
1271 gfc_syntax_error (ST_CLOSE);
1272
1273 cleanup:
1274 gfc_free_close (close);
1275 return MATCH_ERROR;
1276 }
1277
1278
1279 /* Resolve everything in a gfc_close structure. */
1280
1281 try
1282 gfc_resolve_close (gfc_close * close)
1283 {
1284
1285 RESOLVE_TAG (&tag_unit, close->unit);
1286 RESOLVE_TAG (&tag_iostat, close->iostat);
1287 RESOLVE_TAG (&tag_status, close->status);
1288
1289 if (gfc_reference_st_label (close->err, ST_LABEL_TARGET) == FAILURE)
1290 return FAILURE;
1291
1292 return SUCCESS;
1293 }
1294
1295
1296 /* Free a gfc_filepos structure. */
1297
1298 void
1299 gfc_free_filepos (gfc_filepos * fp)
1300 {
1301
1302 gfc_free_expr (fp->unit);
1303 gfc_free_expr (fp->iostat);
1304 gfc_free (fp);
1305 }
1306
1307
1308 /* Match elements of a REWIND, BACKSPACE or ENDFILE statement. */
1309
1310 static match
1311 match_file_element (gfc_filepos * fp)
1312 {
1313 match m;
1314
1315 m = match_etag (&tag_unit, &fp->unit);
1316 if (m != MATCH_NO)
1317 return m;
1318 m = match_out_tag (&tag_iostat, &fp->iostat);
1319 if (m != MATCH_NO)
1320 return m;
1321 m = match_ltag (&tag_err, &fp->err);
1322 if (m != MATCH_NO)
1323 return m;
1324
1325 return MATCH_NO;
1326 }
1327
1328
1329 /* Match the second half of the file-positioning statements, REWIND,
1330 BACKSPACE or ENDFILE. */
1331
1332 static match
1333 match_filepos (gfc_statement st, gfc_exec_op op)
1334 {
1335 gfc_filepos *fp;
1336 match m;
1337
1338 fp = gfc_getmem (sizeof (gfc_filepos));
1339
1340 if (gfc_match_char ('(') == MATCH_NO)
1341 {
1342 m = gfc_match_expr (&fp->unit);
1343 if (m == MATCH_ERROR)
1344 goto cleanup;
1345 if (m == MATCH_NO)
1346 goto syntax;
1347
1348 goto done;
1349 }
1350
1351 m = match_file_element (fp);
1352 if (m == MATCH_ERROR)
1353 goto done;
1354 if (m == MATCH_NO)
1355 {
1356 m = gfc_match_expr (&fp->unit);
1357 if (m == MATCH_ERROR)
1358 goto done;
1359 if (m == MATCH_NO)
1360 goto syntax;
1361 }
1362
1363 for (;;)
1364 {
1365 if (gfc_match_char (')') == MATCH_YES)
1366 break;
1367 if (gfc_match_char (',') != MATCH_YES)
1368 goto syntax;
1369
1370 m = match_file_element (fp);
1371 if (m == MATCH_ERROR)
1372 goto cleanup;
1373 if (m == MATCH_NO)
1374 goto syntax;
1375 }
1376
1377 done:
1378 if (gfc_match_eos () != MATCH_YES)
1379 goto syntax;
1380
1381 if (gfc_pure (NULL))
1382 {
1383 gfc_error ("%s statement not allowed in PURE procedure at %C",
1384 gfc_ascii_statement (st));
1385
1386 goto cleanup;
1387 }
1388
1389 new_st.op = op;
1390 new_st.ext.filepos = fp;
1391 return MATCH_YES;
1392
1393 syntax:
1394 gfc_syntax_error (st);
1395
1396 cleanup:
1397 gfc_free_filepos (fp);
1398 return MATCH_ERROR;
1399 }
1400
1401
1402 try
1403 gfc_resolve_filepos (gfc_filepos * fp)
1404 {
1405
1406 RESOLVE_TAG (&tag_unit, fp->unit);
1407 if (gfc_reference_st_label (fp->err, ST_LABEL_TARGET) == FAILURE)
1408 return FAILURE;
1409
1410 return SUCCESS;
1411 }
1412
1413
1414 /* Match the file positioning statements: ENDFILE, BACKSPACE or
1415 REWIND. */
1416
1417 match
1418 gfc_match_endfile (void)
1419 {
1420
1421 return match_filepos (ST_END_FILE, EXEC_ENDFILE);
1422 }
1423
1424 match
1425 gfc_match_backspace (void)
1426 {
1427
1428 return match_filepos (ST_BACKSPACE, EXEC_BACKSPACE);
1429 }
1430
1431 match
1432 gfc_match_rewind (void)
1433 {
1434
1435 return match_filepos (ST_REWIND, EXEC_REWIND);
1436 }
1437
1438
1439 /******************** Data Transfer Statements *********************/
1440
1441 typedef enum
1442 { M_READ, M_WRITE, M_PRINT, M_INQUIRE }
1443 io_kind;
1444
1445
1446 /* Return a default unit number. */
1447
1448 static gfc_expr *
1449 default_unit (io_kind k)
1450 {
1451 int unit;
1452
1453 if (k == M_READ)
1454 unit = 5;
1455 else
1456 unit = 6;
1457
1458 return gfc_int_expr (unit);
1459 }
1460
1461
1462 /* Match a unit specification for a data transfer statement. */
1463
1464 static match
1465 match_dt_unit (io_kind k, gfc_dt * dt)
1466 {
1467 gfc_expr *e;
1468
1469 if (gfc_match_char ('*') == MATCH_YES)
1470 {
1471 if (dt->io_unit != NULL)
1472 goto conflict;
1473
1474 dt->io_unit = default_unit (k);
1475 return MATCH_YES;
1476 }
1477
1478 if (gfc_match_expr (&e) == MATCH_YES)
1479 {
1480 if (dt->io_unit != NULL)
1481 {
1482 gfc_free_expr (e);
1483 goto conflict;
1484 }
1485
1486 dt->io_unit = e;
1487 return MATCH_YES;
1488 }
1489
1490 return MATCH_NO;
1491
1492 conflict:
1493 gfc_error ("Duplicate UNIT specification at %C");
1494 return MATCH_ERROR;
1495 }
1496
1497
1498 /* Match a format specification. */
1499
1500 static match
1501 match_dt_format (gfc_dt * dt)
1502 {
1503 locus where;
1504 gfc_expr *e;
1505 gfc_st_label *label;
1506
1507 where = gfc_current_locus;
1508
1509 if (gfc_match_char ('*') == MATCH_YES)
1510 {
1511 if (dt->format_expr != NULL || dt->format_label != NULL)
1512 goto conflict;
1513
1514 dt->format_label = &format_asterisk;
1515 return MATCH_YES;
1516 }
1517
1518 if (gfc_match_st_label (&label, 0) == MATCH_YES)
1519 {
1520 if (dt->format_expr != NULL || dt->format_label != NULL)
1521 {
1522 gfc_free_st_label (label);
1523 goto conflict;
1524 }
1525
1526 if (gfc_reference_st_label (label, ST_LABEL_FORMAT) == FAILURE)
1527 return MATCH_ERROR;
1528
1529 dt->format_label = label;
1530 return MATCH_YES;
1531 }
1532
1533 if (gfc_match_expr (&e) == MATCH_YES)
1534 {
1535 if (dt->format_expr != NULL || dt->format_label != NULL)
1536 {
1537 gfc_free_expr (e);
1538 goto conflict;
1539 }
1540 dt->format_expr = e;
1541 return MATCH_YES;
1542 }
1543
1544 gfc_current_locus = where; /* The only case where we have to restore */
1545
1546 return MATCH_NO;
1547
1548 conflict:
1549 gfc_error ("Duplicate format specification at %C");
1550 return MATCH_ERROR;
1551 }
1552
1553
1554 /* Traverse a namelist that is part of a READ statement to make sure
1555 that none of the variables in the namelist are INTENT(IN). Returns
1556 nonzero if we find such a variable. */
1557
1558 static int
1559 check_namelist (gfc_symbol * sym)
1560 {
1561 gfc_namelist *p;
1562
1563 for (p = sym->namelist; p; p = p->next)
1564 if (p->sym->attr.intent == INTENT_IN)
1565 {
1566 gfc_error ("Symbol '%s' in namelist '%s' is INTENT(IN) at %C",
1567 p->sym->name, sym->name);
1568 return 1;
1569 }
1570
1571 return 0;
1572 }
1573
1574
1575 /* Match a single data transfer element. */
1576
1577 static match
1578 match_dt_element (io_kind k, gfc_dt * dt)
1579 {
1580 char name[GFC_MAX_SYMBOL_LEN + 1];
1581 gfc_symbol *sym;
1582 match m;
1583
1584 if (gfc_match (" unit =") == MATCH_YES)
1585 {
1586 m = match_dt_unit (k, dt);
1587 if (m != MATCH_NO)
1588 return m;
1589 }
1590
1591 if (gfc_match (" fmt =") == MATCH_YES)
1592 {
1593 m = match_dt_format (dt);
1594 if (m != MATCH_NO)
1595 return m;
1596 }
1597
1598 if (gfc_match (" nml = %n", name) == MATCH_YES)
1599 {
1600 if (dt->namelist != NULL)
1601 {
1602 gfc_error ("Duplicate NML specification at %C");
1603 return MATCH_ERROR;
1604 }
1605
1606 if (gfc_find_symbol (name, NULL, 1, &sym))
1607 return MATCH_ERROR;
1608
1609 if (sym == NULL || sym->attr.flavor != FL_NAMELIST)
1610 {
1611 gfc_error ("Symbol '%s' at %C must be a NAMELIST group name",
1612 sym != NULL ? sym->name : name);
1613 return MATCH_ERROR;
1614 }
1615
1616 dt->namelist = sym;
1617 if (k == M_READ && check_namelist (sym))
1618 return MATCH_ERROR;
1619
1620 return MATCH_YES;
1621 }
1622
1623 m = match_etag (&tag_rec, &dt->rec);
1624 if (m != MATCH_NO)
1625 return m;
1626 m = match_out_tag (&tag_iostat, &dt->iostat);
1627 if (m != MATCH_NO)
1628 return m;
1629 m = match_ltag (&tag_err, &dt->err);
1630 if (m != MATCH_NO)
1631 return m;
1632 m = match_etag (&tag_advance, &dt->advance);
1633 if (m != MATCH_NO)
1634 return m;
1635 m = match_out_tag (&tag_size, &dt->size);
1636 if (m != MATCH_NO)
1637 return m;
1638
1639 m = match_ltag (&tag_end, &dt->end);
1640 if (m == MATCH_YES)
1641 dt->end_where = gfc_current_locus;
1642 if (m != MATCH_NO)
1643 return m;
1644
1645 m = match_ltag (&tag_eor, &dt->eor);
1646 if (m == MATCH_YES)
1647 dt->eor_where = gfc_current_locus;
1648 if (m != MATCH_NO)
1649 return m;
1650
1651 return MATCH_NO;
1652 }
1653
1654
1655 /* Free a data transfer structure and everything below it. */
1656
1657 void
1658 gfc_free_dt (gfc_dt * dt)
1659 {
1660
1661 if (dt == NULL)
1662 return;
1663
1664 gfc_free_expr (dt->io_unit);
1665 gfc_free_expr (dt->format_expr);
1666 gfc_free_expr (dt->rec);
1667 gfc_free_expr (dt->advance);
1668 gfc_free_expr (dt->iostat);
1669 gfc_free_expr (dt->size);
1670
1671 gfc_free (dt);
1672 }
1673
1674
1675 /* Resolve everything in a gfc_dt structure. */
1676
1677 try
1678 gfc_resolve_dt (gfc_dt * dt)
1679 {
1680 gfc_expr *e;
1681
1682 RESOLVE_TAG (&tag_format, dt->format_expr);
1683 RESOLVE_TAG (&tag_rec, dt->rec);
1684 RESOLVE_TAG (&tag_advance, dt->advance);
1685 RESOLVE_TAG (&tag_iostat, dt->iostat);
1686 RESOLVE_TAG (&tag_size, dt->size);
1687
1688 e = dt->io_unit;
1689 if (gfc_resolve_expr (e) == SUCCESS
1690 && (e->ts.type != BT_INTEGER
1691 && (e->ts.type != BT_CHARACTER
1692 || e->expr_type != EXPR_VARIABLE)))
1693 {
1694 gfc_error
1695 ("UNIT specification at %L must be an INTEGER expression or a "
1696 "CHARACTER variable", &e->where);
1697 return FAILURE;
1698 }
1699
1700 /* Sanity checks on data transfer statements. */
1701 if (e->ts.type == BT_CHARACTER)
1702 {
1703 if (dt->rec != NULL)
1704 {
1705 gfc_error ("REC tag at %L is incompatible with internal file",
1706 &dt->rec->where);
1707 return FAILURE;
1708 }
1709
1710 if (dt->namelist != NULL)
1711 {
1712 gfc_error ("Internal file at %L is incompatible with namelist",
1713 &dt->io_unit->where);
1714 return FAILURE;
1715 }
1716
1717 if (dt->advance != NULL)
1718 {
1719 gfc_error ("ADVANCE tag at %L is incompatible with internal file",
1720 &dt->advance->where);
1721 return FAILURE;
1722 }
1723 }
1724
1725 if (dt->rec != NULL)
1726 {
1727 if (dt->end != NULL)
1728 {
1729 gfc_error ("REC tag at %L is incompatible with END tag",
1730 &dt->rec->where);
1731 return FAILURE;
1732 }
1733
1734 if (dt->format_label == &format_asterisk)
1735 {
1736 gfc_error
1737 ("END tag at %L is incompatible with list directed format (*)",
1738 &dt->end_where);
1739 return FAILURE;
1740 }
1741
1742 if (dt->namelist != NULL)
1743 {
1744 gfc_error ("REC tag at %L is incompatible with namelist",
1745 &dt->rec->where);
1746 return FAILURE;
1747 }
1748 }
1749
1750 if (dt->advance != NULL && dt->format_label == &format_asterisk)
1751 {
1752 gfc_error ("ADVANCE tag at %L is incompatible with list directed "
1753 "format (*)", &dt->advance->where);
1754 return FAILURE;
1755 }
1756
1757 if (dt->eor != 0 && dt->advance == NULL)
1758 {
1759 gfc_error ("EOR tag at %L requires an ADVANCE tag", &dt->eor_where);
1760 return FAILURE;
1761 }
1762
1763 if (dt->size != NULL && dt->advance == NULL)
1764 {
1765 gfc_error ("SIZE tag at %L requires an ADVANCE tag", &dt->size->where);
1766 return FAILURE;
1767 }
1768
1769 /* TODO: Make sure the ADVANCE tag is 'yes' or 'no' if it is a string
1770 constant. */
1771
1772 if (gfc_reference_st_label (dt->err, ST_LABEL_TARGET) == FAILURE)
1773 return FAILURE;
1774
1775 if (gfc_reference_st_label (dt->end, ST_LABEL_TARGET) == FAILURE)
1776 return FAILURE;
1777
1778 if (gfc_reference_st_label (dt->eor, ST_LABEL_TARGET) == FAILURE)
1779 return FAILURE;
1780
1781 /* Check the format label actually exists. */
1782 if (dt->format_label && dt->format_label != &format_asterisk
1783 && dt->format_label->defined == ST_LABEL_UNKNOWN)
1784 {
1785 gfc_error ("FORMAT label %d at %L not defined", dt->format_label->value,
1786 &dt->format_label->where);
1787 return FAILURE;
1788 }
1789 return SUCCESS;
1790 }
1791
1792
1793 /* Given an io_kind, return its name. */
1794
1795 static const char *
1796 io_kind_name (io_kind k)
1797 {
1798 const char *name;
1799
1800 switch (k)
1801 {
1802 case M_READ:
1803 name = "READ";
1804 break;
1805 case M_WRITE:
1806 name = "WRITE";
1807 break;
1808 case M_PRINT:
1809 name = "PRINT";
1810 break;
1811 case M_INQUIRE:
1812 name = "INQUIRE";
1813 break;
1814 default:
1815 gfc_internal_error ("io_kind_name(): bad I/O-kind");
1816 }
1817
1818 return name;
1819 }
1820
1821
1822 /* Match an IO iteration statement of the form:
1823
1824 ( [<IO element> ,] <IO element>, I = <expr>, <expr> [, <expr> ] )
1825
1826 which is equivalent to a single IO element. This function is
1827 mutually recursive with match_io_element(). */
1828
1829 static match match_io_element (io_kind k, gfc_code **);
1830
1831 static match
1832 match_io_iterator (io_kind k, gfc_code ** result)
1833 {
1834 gfc_code *head, *tail, *new;
1835 gfc_iterator *iter;
1836 locus old_loc;
1837 match m;
1838 int n;
1839
1840 iter = NULL;
1841 head = NULL;
1842 old_loc = gfc_current_locus;
1843
1844 if (gfc_match_char ('(') != MATCH_YES)
1845 return MATCH_NO;
1846
1847 m = match_io_element (k, &head);
1848 tail = head;
1849
1850 if (m != MATCH_YES || gfc_match_char (',') != MATCH_YES)
1851 {
1852 m = MATCH_NO;
1853 goto cleanup;
1854 }
1855
1856 /* Can't be anything but an IO iterator. Build a list. */
1857 iter = gfc_get_iterator ();
1858
1859 for (n = 1;; n++)
1860 {
1861 m = gfc_match_iterator (iter, 0);
1862 if (m == MATCH_ERROR)
1863 goto cleanup;
1864 if (m == MATCH_YES)
1865 {
1866 gfc_check_do_variable (iter->var->symtree);
1867 break;
1868 }
1869
1870 m = match_io_element (k, &new);
1871 if (m == MATCH_ERROR)
1872 goto cleanup;
1873 if (m == MATCH_NO)
1874 {
1875 if (n > 2)
1876 goto syntax;
1877 goto cleanup;
1878 }
1879
1880 tail = gfc_append_code (tail, new);
1881
1882 if (gfc_match_char (',') != MATCH_YES)
1883 {
1884 if (n > 2)
1885 goto syntax;
1886 m = MATCH_NO;
1887 goto cleanup;
1888 }
1889 }
1890
1891 if (gfc_match_char (')') != MATCH_YES)
1892 goto syntax;
1893
1894 new = gfc_get_code ();
1895 new->op = EXEC_DO;
1896 new->ext.iterator = iter;
1897
1898 new->block = gfc_get_code ();
1899 new->block->op = EXEC_DO;
1900 new->block->next = head;
1901
1902 *result = new;
1903 return MATCH_YES;
1904
1905 syntax:
1906 gfc_error ("Syntax error in I/O iterator at %C");
1907 m = MATCH_ERROR;
1908
1909 cleanup:
1910 gfc_free_iterator (iter, 1);
1911 gfc_free_statements (head);
1912 gfc_current_locus = old_loc;
1913 return m;
1914 }
1915
1916
1917 /* Match a single element of an IO list, which is either a single
1918 expression or an IO Iterator. */
1919
1920 static match
1921 match_io_element (io_kind k, gfc_code ** cpp)
1922 {
1923 gfc_expr *expr;
1924 gfc_code *cp;
1925 match m;
1926
1927 expr = NULL;
1928
1929 m = match_io_iterator (k, cpp);
1930 if (m == MATCH_YES)
1931 return MATCH_YES;
1932
1933 if (k == M_READ)
1934 {
1935 m = gfc_match_variable (&expr, 0);
1936 if (m == MATCH_NO)
1937 gfc_error ("Expected variable in READ statement at %C");
1938 }
1939 else
1940 {
1941 m = gfc_match_expr (&expr);
1942 if (m == MATCH_NO)
1943 gfc_error ("Expected expression in %s statement at %C",
1944 io_kind_name (k));
1945 }
1946
1947 if (m == MATCH_YES)
1948 switch (k)
1949 {
1950 case M_READ:
1951 if (expr->symtree->n.sym->attr.intent == INTENT_IN)
1952 {
1953 gfc_error
1954 ("Variable '%s' in input list at %C cannot be INTENT(IN)",
1955 expr->symtree->n.sym->name);
1956 m = MATCH_ERROR;
1957 }
1958
1959 if (gfc_pure (NULL)
1960 && gfc_impure_variable (expr->symtree->n.sym)
1961 && current_dt->io_unit->ts.type == BT_CHARACTER)
1962 {
1963 gfc_error ("Cannot read to variable '%s' in PURE procedure at %C",
1964 expr->symtree->n.sym->name);
1965 m = MATCH_ERROR;
1966 }
1967
1968 if (gfc_check_do_variable (expr->symtree))
1969 m = MATCH_ERROR;
1970
1971 break;
1972
1973 case M_WRITE:
1974 if (current_dt->io_unit->ts.type == BT_CHARACTER
1975 && gfc_pure (NULL)
1976 && current_dt->io_unit->expr_type == EXPR_VARIABLE
1977 && gfc_impure_variable (current_dt->io_unit->symtree->n.sym))
1978 {
1979 gfc_error
1980 ("Cannot write to internal file unit '%s' at %C inside a "
1981 "PURE procedure", current_dt->io_unit->symtree->n.sym->name);
1982 m = MATCH_ERROR;
1983 }
1984
1985 break;
1986
1987 default:
1988 break;
1989 }
1990
1991 if (m != MATCH_YES)
1992 {
1993 gfc_free_expr (expr);
1994 return MATCH_ERROR;
1995 }
1996
1997 cp = gfc_get_code ();
1998 cp->op = EXEC_TRANSFER;
1999 cp->expr = expr;
2000
2001 *cpp = cp;
2002 return MATCH_YES;
2003 }
2004
2005
2006 /* Match an I/O list, building gfc_code structures as we go. */
2007
2008 static match
2009 match_io_list (io_kind k, gfc_code ** head_p)
2010 {
2011 gfc_code *head, *tail, *new;
2012 match m;
2013
2014 *head_p = head = tail = NULL;
2015 if (gfc_match_eos () == MATCH_YES)
2016 return MATCH_YES;
2017
2018 for (;;)
2019 {
2020 m = match_io_element (k, &new);
2021 if (m == MATCH_ERROR)
2022 goto cleanup;
2023 if (m == MATCH_NO)
2024 goto syntax;
2025
2026 tail = gfc_append_code (tail, new);
2027 if (head == NULL)
2028 head = new;
2029
2030 if (gfc_match_eos () == MATCH_YES)
2031 break;
2032 if (gfc_match_char (',') != MATCH_YES)
2033 goto syntax;
2034 }
2035
2036 *head_p = head;
2037 return MATCH_YES;
2038
2039 syntax:
2040 gfc_error ("Syntax error in %s statement at %C", io_kind_name (k));
2041
2042 cleanup:
2043 gfc_free_statements (head);
2044 return MATCH_ERROR;
2045 }
2046
2047
2048 /* Attach the data transfer end node. */
2049
2050 static void
2051 terminate_io (gfc_code * io_code)
2052 {
2053 gfc_code *c;
2054
2055 if (io_code == NULL)
2056 io_code = &new_st;
2057
2058 c = gfc_get_code ();
2059 c->op = EXEC_DT_END;
2060
2061 /* Point to structure that is already there */
2062 c->ext.dt = new_st.ext.dt;
2063 gfc_append_code (io_code, c);
2064 }
2065
2066
2067 /* Match a READ, WRITE or PRINT statement. */
2068
2069 static match
2070 match_io (io_kind k)
2071 {
2072 char name[GFC_MAX_SYMBOL_LEN + 1];
2073 gfc_code *io_code;
2074 gfc_symbol *sym;
2075 gfc_expr *expr;
2076 int comma_flag, c;
2077 locus where;
2078 gfc_dt *dt;
2079 match m;
2080
2081 comma_flag = 0;
2082 current_dt = dt = gfc_getmem (sizeof (gfc_dt));
2083
2084 if (gfc_match_char ('(') == MATCH_NO)
2085 {
2086 if (k == M_WRITE)
2087 goto syntax;
2088
2089 if (gfc_current_form == FORM_FREE)
2090 {
2091 c = gfc_peek_char();
2092 if (c != ' ' && c != '*' && c != '\'' && c != '"')
2093 {
2094 m = MATCH_NO;
2095 goto cleanup;
2096 }
2097 }
2098
2099 m = match_dt_format (dt);
2100 if (m == MATCH_ERROR)
2101 goto cleanup;
2102 if (m == MATCH_NO)
2103 goto syntax;
2104
2105 comma_flag = 1;
2106 dt->io_unit = default_unit (k);
2107 goto get_io_list;
2108 }
2109
2110 /* Match a control list */
2111 if (match_dt_element (k, dt) == MATCH_YES)
2112 goto next;
2113 if (match_dt_unit (k, dt) != MATCH_YES)
2114 goto loop;
2115
2116 if (gfc_match_char (')') == MATCH_YES)
2117 goto get_io_list;
2118 if (gfc_match_char (',') != MATCH_YES)
2119 goto syntax;
2120
2121 m = match_dt_element (k, dt);
2122 if (m == MATCH_YES)
2123 goto next;
2124 if (m == MATCH_ERROR)
2125 goto cleanup;
2126
2127 m = match_dt_format (dt);
2128 if (m == MATCH_YES)
2129 goto next;
2130 if (m == MATCH_ERROR)
2131 goto cleanup;
2132
2133 where = gfc_current_locus;
2134
2135 if (gfc_match_name (name) == MATCH_YES
2136 && !gfc_find_symbol (name, NULL, 1, &sym)
2137 && sym->attr.flavor == FL_NAMELIST)
2138 {
2139 dt->namelist = sym;
2140 if (k == M_READ && check_namelist (sym))
2141 {
2142 m = MATCH_ERROR;
2143 goto cleanup;
2144 }
2145 goto next;
2146 }
2147
2148 gfc_current_locus = where;
2149
2150 goto loop; /* No matches, try regular elements */
2151
2152 next:
2153 if (gfc_match_char (')') == MATCH_YES)
2154 goto get_io_list;
2155 if (gfc_match_char (',') != MATCH_YES)
2156 goto syntax;
2157
2158 loop:
2159 for (;;)
2160 {
2161 m = match_dt_element (k, dt);
2162 if (m == MATCH_NO)
2163 goto syntax;
2164 if (m == MATCH_ERROR)
2165 goto cleanup;
2166
2167 if (gfc_match_char (')') == MATCH_YES)
2168 break;
2169 if (gfc_match_char (',') != MATCH_YES)
2170 goto syntax;
2171 }
2172
2173 get_io_list:
2174 /* Optional leading comma (non-standard). */
2175 if (!comma_flag
2176 && gfc_match_char (',') == MATCH_YES
2177 && k == M_WRITE
2178 && gfc_notify_std (GFC_STD_GNU, "Extension: Comma before output "
2179 "item list at %C is an extension") == FAILURE)
2180 return MATCH_ERROR;
2181
2182 io_code = NULL;
2183 if (gfc_match_eos () != MATCH_YES)
2184 {
2185 if (comma_flag && gfc_match_char (',') != MATCH_YES)
2186 {
2187 gfc_error ("Expected comma in I/O list at %C");
2188 m = MATCH_ERROR;
2189 goto cleanup;
2190 }
2191
2192 m = match_io_list (k, &io_code);
2193 if (m == MATCH_ERROR)
2194 goto cleanup;
2195 if (m == MATCH_NO)
2196 goto syntax;
2197 }
2198
2199 /* A full IO statement has been matched. */
2200 if (dt->io_unit->expr_type == EXPR_VARIABLE
2201 && k == M_WRITE
2202 && dt->io_unit->ts.type == BT_CHARACTER
2203 && dt->io_unit->symtree->n.sym->attr.intent == INTENT_IN)
2204 {
2205 gfc_error ("Internal file '%s' at %L is INTENT(IN)",
2206 dt->io_unit->symtree->n.sym->name, &dt->io_unit->where);
2207 m = MATCH_ERROR;
2208 goto cleanup;
2209 }
2210
2211 expr = dt->format_expr;
2212
2213 if (expr != NULL && expr->expr_type == EXPR_CONSTANT)
2214 check_format_string (expr);
2215
2216 if (gfc_pure (NULL)
2217 && (k == M_READ || k == M_WRITE)
2218 && dt->io_unit->ts.type != BT_CHARACTER)
2219 {
2220 gfc_error
2221 ("io-unit in %s statement at %C must be an internal file in a "
2222 "PURE procedure", io_kind_name (k));
2223 m = MATCH_ERROR;
2224 goto cleanup;
2225 }
2226
2227 new_st.op = (k == M_READ) ? EXEC_READ : EXEC_WRITE;
2228 new_st.ext.dt = dt;
2229 new_st.next = io_code;
2230
2231 terminate_io (io_code);
2232
2233 return MATCH_YES;
2234
2235 syntax:
2236 gfc_error ("Syntax error in %s statement at %C", io_kind_name (k));
2237 m = MATCH_ERROR;
2238
2239 cleanup:
2240 gfc_free_dt (dt);
2241 return m;
2242 }
2243
2244
2245 match
2246 gfc_match_read (void)
2247 {
2248 return match_io (M_READ);
2249 }
2250
2251 match
2252 gfc_match_write (void)
2253 {
2254 return match_io (M_WRITE);
2255 }
2256
2257 match
2258 gfc_match_print (void)
2259 {
2260 match m;
2261
2262 m = match_io (M_PRINT);
2263 if (m != MATCH_YES)
2264 return m;
2265
2266 if (gfc_pure (NULL))
2267 {
2268 gfc_error ("PRINT statement at %C not allowed within PURE procedure");
2269 return MATCH_ERROR;
2270 }
2271
2272 return MATCH_YES;
2273 }
2274
2275
2276 /* Free a gfc_inquire structure. */
2277
2278 void
2279 gfc_free_inquire (gfc_inquire * inquire)
2280 {
2281
2282 if (inquire == NULL)
2283 return;
2284
2285 gfc_free_expr (inquire->unit);
2286 gfc_free_expr (inquire->file);
2287 gfc_free_expr (inquire->iostat);
2288 gfc_free_expr (inquire->exist);
2289 gfc_free_expr (inquire->opened);
2290 gfc_free_expr (inquire->number);
2291 gfc_free_expr (inquire->named);
2292 gfc_free_expr (inquire->name);
2293 gfc_free_expr (inquire->access);
2294 gfc_free_expr (inquire->sequential);
2295 gfc_free_expr (inquire->direct);
2296 gfc_free_expr (inquire->form);
2297 gfc_free_expr (inquire->formatted);
2298 gfc_free_expr (inquire->unformatted);
2299 gfc_free_expr (inquire->recl);
2300 gfc_free_expr (inquire->nextrec);
2301 gfc_free_expr (inquire->blank);
2302 gfc_free_expr (inquire->position);
2303 gfc_free_expr (inquire->action);
2304 gfc_free_expr (inquire->read);
2305 gfc_free_expr (inquire->write);
2306 gfc_free_expr (inquire->readwrite);
2307 gfc_free_expr (inquire->delim);
2308 gfc_free_expr (inquire->pad);
2309 gfc_free_expr (inquire->iolength);
2310
2311 gfc_free (inquire);
2312 }
2313
2314
2315 /* Match an element of an INQUIRE statement. */
2316
2317 #define RETM if (m != MATCH_NO) return m;
2318
2319 static match
2320 match_inquire_element (gfc_inquire * inquire)
2321 {
2322 match m;
2323
2324 m = match_etag (&tag_unit, &inquire->unit);
2325 RETM m = match_etag (&tag_file, &inquire->file);
2326 RETM m = match_ltag (&tag_err, &inquire->err);
2327 RETM m = match_out_tag (&tag_iostat, &inquire->iostat);
2328 RETM m = match_vtag (&tag_exist, &inquire->exist);
2329 RETM m = match_vtag (&tag_opened, &inquire->opened);
2330 RETM m = match_vtag (&tag_named, &inquire->named);
2331 RETM m = match_vtag (&tag_name, &inquire->name);
2332 RETM m = match_out_tag (&tag_number, &inquire->number);
2333 RETM m = match_vtag (&tag_s_access, &inquire->access);
2334 RETM m = match_vtag (&tag_sequential, &inquire->sequential);
2335 RETM m = match_vtag (&tag_direct, &inquire->direct);
2336 RETM m = match_vtag (&tag_s_form, &inquire->form);
2337 RETM m = match_vtag (&tag_formatted, &inquire->formatted);
2338 RETM m = match_vtag (&tag_unformatted, &inquire->unformatted);
2339 RETM m = match_out_tag (&tag_s_recl, &inquire->recl);
2340 RETM m = match_out_tag (&tag_nextrec, &inquire->nextrec);
2341 RETM m = match_vtag (&tag_s_blank, &inquire->blank);
2342 RETM m = match_vtag (&tag_s_position, &inquire->position);
2343 RETM m = match_vtag (&tag_s_action, &inquire->action);
2344 RETM m = match_vtag (&tag_read, &inquire->read);
2345 RETM m = match_vtag (&tag_write, &inquire->write);
2346 RETM m = match_vtag (&tag_readwrite, &inquire->readwrite);
2347 RETM m = match_vtag (&tag_s_delim, &inquire->delim);
2348 RETM m = match_vtag (&tag_s_pad, &inquire->pad);
2349 RETM m = match_vtag (&tag_iolength, &inquire->iolength);
2350 RETM return MATCH_NO;
2351 }
2352
2353 #undef RETM
2354
2355
2356 match
2357 gfc_match_inquire (void)
2358 {
2359 gfc_inquire *inquire;
2360 gfc_code *code;
2361 match m;
2362
2363 m = gfc_match_char ('(');
2364 if (m == MATCH_NO)
2365 return m;
2366
2367 inquire = gfc_getmem (sizeof (gfc_inquire));
2368
2369 m = match_inquire_element (inquire);
2370 if (m == MATCH_ERROR)
2371 goto cleanup;
2372 if (m == MATCH_NO)
2373 {
2374 m = gfc_match_expr (&inquire->unit);
2375 if (m == MATCH_ERROR)
2376 goto cleanup;
2377 if (m == MATCH_NO)
2378 goto syntax;
2379 }
2380
2381 /* See if we have the IOLENGTH form of the inquire statement. */
2382 if (inquire->iolength != NULL)
2383 {
2384 if (gfc_match_char (')') != MATCH_YES)
2385 goto syntax;
2386
2387 m = match_io_list (M_INQUIRE, &code);
2388 if (m == MATCH_ERROR)
2389 goto cleanup;
2390 if (m == MATCH_NO)
2391 goto syntax;
2392
2393 terminate_io (code);
2394
2395 new_st.op = EXEC_IOLENGTH;
2396 new_st.expr = inquire->iolength;
2397 new_st.ext.inquire = inquire;
2398
2399 if (gfc_pure (NULL))
2400 {
2401 gfc_free_statements (code);
2402 gfc_error ("INQUIRE statement not allowed in PURE procedure at %C");
2403 return MATCH_ERROR;
2404 }
2405
2406 new_st.next = code;
2407 return MATCH_YES;
2408 }
2409
2410 /* At this point, we have the non-IOLENGTH inquire statement. */
2411 for (;;)
2412 {
2413 if (gfc_match_char (')') == MATCH_YES)
2414 break;
2415 if (gfc_match_char (',') != MATCH_YES)
2416 goto syntax;
2417
2418 m = match_inquire_element (inquire);
2419 if (m == MATCH_ERROR)
2420 goto cleanup;
2421 if (m == MATCH_NO)
2422 goto syntax;
2423
2424 if (inquire->iolength != NULL)
2425 {
2426 gfc_error ("IOLENGTH tag invalid in INQUIRE statement at %C");
2427 goto cleanup;
2428 }
2429 }
2430
2431 if (gfc_match_eos () != MATCH_YES)
2432 goto syntax;
2433
2434 if (gfc_pure (NULL))
2435 {
2436 gfc_error ("INQUIRE statement not allowed in PURE procedure at %C");
2437 goto cleanup;
2438 }
2439
2440 new_st.op = EXEC_INQUIRE;
2441 new_st.ext.inquire = inquire;
2442 return MATCH_YES;
2443
2444 syntax:
2445 gfc_syntax_error (ST_INQUIRE);
2446
2447 cleanup:
2448 gfc_free_inquire (inquire);
2449 return MATCH_ERROR;
2450 }
2451
2452
2453 /* Resolve everything in a gfc_inquire structure. */
2454
2455 try
2456 gfc_resolve_inquire (gfc_inquire * inquire)
2457 {
2458
2459 RESOLVE_TAG (&tag_unit, inquire->unit);
2460 RESOLVE_TAG (&tag_file, inquire->file);
2461 RESOLVE_TAG (&tag_iostat, inquire->iostat);
2462 RESOLVE_TAG (&tag_exist, inquire->exist);
2463 RESOLVE_TAG (&tag_opened, inquire->opened);
2464 RESOLVE_TAG (&tag_number, inquire->number);
2465 RESOLVE_TAG (&tag_named, inquire->named);
2466 RESOLVE_TAG (&tag_name, inquire->name);
2467 RESOLVE_TAG (&tag_s_access, inquire->access);
2468 RESOLVE_TAG (&tag_sequential, inquire->sequential);
2469 RESOLVE_TAG (&tag_direct, inquire->direct);
2470 RESOLVE_TAG (&tag_s_form, inquire->form);
2471 RESOLVE_TAG (&tag_formatted, inquire->formatted);
2472 RESOLVE_TAG (&tag_unformatted, inquire->unformatted);
2473 RESOLVE_TAG (&tag_s_recl, inquire->recl);
2474 RESOLVE_TAG (&tag_nextrec, inquire->nextrec);
2475 RESOLVE_TAG (&tag_s_blank, inquire->blank);
2476 RESOLVE_TAG (&tag_s_position, inquire->position);
2477 RESOLVE_TAG (&tag_s_action, inquire->action);
2478 RESOLVE_TAG (&tag_read, inquire->read);
2479 RESOLVE_TAG (&tag_write, inquire->write);
2480 RESOLVE_TAG (&tag_readwrite, inquire->readwrite);
2481 RESOLVE_TAG (&tag_s_delim, inquire->delim);
2482 RESOLVE_TAG (&tag_s_pad, inquire->pad);
2483 RESOLVE_TAG (&tag_iolength, inquire->iolength);
2484
2485 if (gfc_reference_st_label (inquire->err, ST_LABEL_TARGET) == FAILURE)
2486 return FAILURE;
2487
2488 return SUCCESS;
2489 }