1 /* Deal with I/O statements & related stuff.
2 Copyright (C) 2000, 2001, 2002, 2003, 2004 Free Software Foundation,
4 Contributed by Andy Vaught
6 This file is part of GCC.
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
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
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
33 gfc_st_label format_asterisk =
34 { -1, ST_LABEL_FORMAT, ST_LABEL_FORMAT, NULL, 0,
35 {NULL, NULL}, NULL, NULL};
39 const char *name, *spec;
45 tag_file = { "FILE", " file = %e", BT_CHARACTER },
46 tag_status = { "STATUS", " status = %e", BT_CHARACTER},
47 tag_e_access = {"ACCESS", " access = %e", BT_CHARACTER},
48 tag_e_form = {"FORM", " form = %e", BT_CHARACTER},
49 tag_e_recl = {"RECL", " recl = %e", BT_INTEGER},
50 tag_e_blank = {"BLANK", " blank = %e", BT_CHARACTER},
51 tag_e_position = {"POSITION", " position = %e", BT_CHARACTER},
52 tag_e_action = {"ACTION", " action = %e", BT_CHARACTER},
53 tag_e_delim = {"DELIM", " delim = %e", BT_CHARACTER},
54 tag_e_pad = {"PAD", " pad = %e", BT_CHARACTER},
55 tag_unit = {"UNIT", " unit = %e", BT_INTEGER},
56 tag_advance = {"ADVANCE", " advance = %e", BT_CHARACTER},
57 tag_rec = {"REC", " rec = %e", BT_INTEGER},
58 tag_format = {"FORMAT", NULL, BT_CHARACTER},
59 tag_iostat = {"IOSTAT", " iostat = %v", BT_INTEGER},
60 tag_size = {"SIZE", " size = %v", BT_INTEGER},
61 tag_exist = {"EXIST", " exist = %v", BT_LOGICAL},
62 tag_opened = {"OPENED", " opened = %v", BT_LOGICAL},
63 tag_named = {"NAMED", " named = %v", BT_LOGICAL},
64 tag_name = {"NAME", " name = %v", BT_CHARACTER},
65 tag_number = {"NUMBER", " number = %v", BT_INTEGER},
66 tag_s_access = {"ACCESS", " access = %v", BT_CHARACTER},
67 tag_sequential = {"SEQUENTIAL", " sequential = %v", BT_CHARACTER},
68 tag_direct = {"DIRECT", " direct = %v", BT_CHARACTER},
69 tag_s_form = {"FORM", " form = %v", BT_CHARACTER},
70 tag_formatted = {"FORMATTED", " formatted = %v", BT_CHARACTER},
71 tag_unformatted = {"UNFORMATTED", " unformatted = %v", BT_CHARACTER},
72 tag_s_recl = {"RECL", " recl = %v", BT_INTEGER},
73 tag_nextrec = {"NEXTREC", " nextrec = %v", BT_INTEGER},
74 tag_s_blank = {"BLANK", " blank = %v", BT_CHARACTER},
75 tag_s_position = {"POSITION", " position = %v", BT_CHARACTER},
76 tag_s_action = {"ACTION", " action = %v", BT_CHARACTER},
77 tag_read = {"READ", " read = %v", BT_CHARACTER},
78 tag_write = {"WRITE", " write = %v", BT_CHARACTER},
79 tag_readwrite = {"READWRITE", " readwrite = %v", BT_CHARACTER},
80 tag_s_delim = {"DELIM", " delim = %v", BT_CHARACTER},
81 tag_s_pad = {"PAD", " pad = %v", BT_CHARACTER},
82 tag_iolength = {"IOLENGTH", " iolength = %v", BT_INTEGER},
83 tag_err = {"ERR", " err = %l", BT_UNKNOWN},
84 tag_end = {"END", " end = %l", BT_UNKNOWN},
85 tag_eor = {"EOR", " eor = %l", BT_UNKNOWN};
87 static gfc_dt *current_dt;
89 #define RESOLVE_TAG(x, y) if (resolve_tag(x, y) == FAILURE) return FAILURE;
92 /**************** Fortran 95 FORMAT parser *****************/
94 /* FORMAT tokens returned by format_lex(). */
97 FMT_NONE, FMT_UNKNOWN, FMT_SIGNED_INT, FMT_ZERO, FMT_POSINT, FMT_PERIOD,
98 FMT_COMMA, FMT_COLON, FMT_SLASH, FMT_DOLLAR, FMT_POS, FMT_LPAREN,
99 FMT_RPAREN, FMT_X, FMT_SIGN, FMT_BLANK, FMT_CHAR, FMT_P, FMT_IBOZ, FMT_F,
100 FMT_E, FMT_EXT, FMT_G, FMT_L, FMT_A, FMT_D, FMT_H, FMT_END
104 /* Local variables for checking format strings. The saved_token is
105 used to back up by a single format token during the parsing
107 static char *format_string;
108 static int format_length, use_last_char;
110 static format_token saved_token;
113 { MODE_STRING, MODE_FORMAT, MODE_COPY }
117 /* Return the next character in the format string. */
120 next_char (int in_string)
132 if (mode == MODE_STRING)
133 c = *format_string++;
136 c = gfc_next_char_literal (in_string);
140 if (mode == MODE_COPY)
141 *format_string++ = c;
149 /* Back up one character position. Only works once. */
158 static int value = 0;
160 /* Simple lexical analyzer for getting the next token in a FORMAT
171 if (saved_token != FMT_NONE)
174 saved_token = FMT_NONE;
182 while (gfc_is_whitespace (c));
203 value = 10 * value + c - '0';
212 token = FMT_SIGNED_INT;
235 value = 10 * value + c - '0';
240 token = zflag ? FMT_ZERO : FMT_POSINT;
265 if (c != 'L' && c != 'R')
285 if (c != 'P' && c != 'S')
293 if (c == 'N' || c == 'Z')
355 if (c == 'N' || c == 'S')
398 /* Check a format statement. The format string, either from a FORMAT
399 statement or a constant in an I/O statement has already been parsed
400 by itself, and we are checking it for validity. The dual origin
401 means that the warning message is a little less than great. */
406 const char *posint_required = "Positive width required";
407 const char *period_required = "Period required";
408 const char *nonneg_required = "Nonnegative width required";
409 const char *unexpected_element = "Unexpected element";
410 const char *unexpected_end = "Unexpected end of format string";
419 saved_token = FMT_NONE;
427 error = "Missing leading left parenthesis";
433 goto finished; /* Empty format is legal */
437 /* In this state, the next thing has to be a format item. */
460 /* Signed integer can only precede a P format. */
464 error = "Expected P edit descriptor";
471 /* P requires a prior number. */
472 error = "P descriptor requires leading scale factor";
476 /* X requires a prior number if we're being pedantic. */
477 if (gfc_notify_std (GFC_STD_GNU, "Extension: X descriptor "
478 "requires leading space count at %C")
488 goto extension_optional_comma;
496 if (t != FMT_RPAREN || level > 0)
498 error = "$ must the last specifier";
519 error = unexpected_end;
523 error = unexpected_element;
528 /* In this state, t must currently be a data descriptor.
529 Deal with things that can/must follow the descriptor. */
543 error = "Repeat count cannot follow P descriptor";
558 error = posint_required;
574 error = posint_required;
581 error = period_required;
586 if (u != FMT_ZERO && u != FMT_POSINT)
588 error = nonneg_required;
595 /* Look for optional exponent. */
606 error = "Positive exponent width required";
615 if (t != FMT_ZERO && t != FMT_POSINT)
617 error = nonneg_required;
624 error = period_required;
629 if (t != FMT_ZERO && t != FMT_POSINT)
631 error = nonneg_required;
638 if(mode == MODE_STRING)
640 format_string += value;
641 format_length -= value;
655 if (t != FMT_ZERO && t != FMT_POSINT)
657 error = nonneg_required;
669 if (t != FMT_ZERO && t != FMT_POSINT)
671 error = nonneg_required;
679 error = unexpected_element;
684 /* Between a descriptor and what comes next. */
703 error = unexpected_end;
707 error = "Missing comma";
712 /* Optional comma is a weird between state where we've just finished
713 reading a colon, slash or P descriptor. */
727 /* Assume that we have another format item. */
734 extension_optional_comma:
735 /* As a GNU extension, permit a missing comma after a string literal. */
753 error = unexpected_end;
757 if (gfc_notify_std (GFC_STD_GNU, "Extension: Missing comma at %C")
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
771 if (mode != MODE_STRING)
772 gfc_error ("%s in format string at %C", error);
775 gfc_warning ("%s in format string at %C", error);
777 /* TODO: More elaborate measures are needed to show where a problem
778 is within a format string that has been calculated. */
788 /* Given an expression node that is a constant string, see if it looks
789 like a format string. */
792 check_format_string (gfc_expr * e)
796 format_string = e->value.character.string;
801 /************ Fortran 95 I/O statement matchers *************/
803 /* Match a FORMAT statement. This amounts to actually parsing the
804 format descriptors in order to correctly locate the end of the
808 gfc_match_format (void)
813 if (gfc_statement_label == NULL)
815 gfc_error ("Missing format label at %C");
818 gfc_gobble_whitespace ();
823 start = gfc_current_locus;
825 if (check_format () == FAILURE)
828 if (gfc_match_eos () != MATCH_YES)
830 gfc_syntax_error (ST_FORMAT);
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. */
837 gfc_current_locus = start; /* Back to the beginning */
840 new_st.op = EXEC_NOP;
843 e->expr_type = EXPR_CONSTANT;
844 e->ts.type = BT_CHARACTER;
845 e->ts.kind = gfc_default_character_kind();
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;
852 check_format (); /* Guaranteed to succeed */
853 gfc_match_eos (); /* Guaranteed to succeed */
859 /* Match an expression I/O tag of some sort. */
862 match_etag (const io_tag * tag, gfc_expr ** v)
867 m = gfc_match (tag->spec, &result);
873 gfc_error ("Duplicate %s specification at %C", tag->name);
874 gfc_free_expr (result);
883 /* Match a variable I/O tag of some sort. */
886 match_vtag (const io_tag * tag, gfc_expr ** v)
891 m = gfc_match (tag->spec, &result);
897 gfc_error ("Duplicate %s specification at %C", tag->name);
898 gfc_free_expr (result);
902 if (result->symtree->n.sym->attr.intent == INTENT_IN)
904 gfc_error ("Variable tag cannot be INTENT(IN) at %C");
905 gfc_free_expr (result);
909 if (gfc_pure (NULL) && gfc_impure_variable (result->symtree->n.sym))
911 gfc_error ("Variable tag cannot be assigned in PURE procedure at %C");
912 gfc_free_expr (result);
921 /* Match a label I/O tag. */
924 match_ltag (const io_tag * tag, gfc_st_label ** label)
930 m = gfc_match (tag->spec, label);
931 if (m == MATCH_YES && old != 0)
933 gfc_error ("Duplicate %s label specification at %C", tag->name);
941 /* Do expression resolution and type-checking on an expression tag. */
944 resolve_tag (const io_tag * tag, gfc_expr * e)
950 if (gfc_resolve_expr (e) == FAILURE)
953 if (e->ts.type != tag->type)
955 /* Format label can be integer varibale. */
956 if (tag != &tag_format)
958 gfc_error ("%s tag at %L must be of type %s", tag->name, &e->where,
959 gfc_basic_typename (tag->type));
964 if (tag == &tag_format)
966 if (e->rank != 1 && e->rank != 0)
968 gfc_error ("FORMAT tag at %L cannot be array of strings",
977 gfc_error ("%s tag at %L must be scalar", tag->name, &e->where);
986 /* Match a single tag of an OPEN statement. */
989 match_open_element (gfc_open * open)
993 m = match_etag (&tag_unit, &open->unit);
996 m = match_vtag (&tag_iostat, &open->iostat);
999 m = match_etag (&tag_file, &open->file);
1002 m = match_etag (&tag_status, &open->status);
1005 m = match_etag (&tag_e_access, &open->access);
1008 m = match_etag (&tag_e_form, &open->form);
1011 m = match_etag (&tag_e_recl, &open->recl);
1014 m = match_etag (&tag_e_blank, &open->blank);
1017 m = match_etag (&tag_e_position, &open->position);
1020 m = match_etag (&tag_e_action, &open->action);
1023 m = match_etag (&tag_e_delim, &open->delim);
1026 m = match_etag (&tag_e_pad, &open->pad);
1029 m = match_ltag (&tag_err, &open->err);
1037 /* Free the gfc_open structure and all the expressions it contains. */
1040 gfc_free_open (gfc_open * open)
1046 gfc_free_expr (open->unit);
1047 gfc_free_expr (open->iostat);
1048 gfc_free_expr (open->file);
1049 gfc_free_expr (open->status);
1050 gfc_free_expr (open->access);
1051 gfc_free_expr (open->form);
1052 gfc_free_expr (open->recl);
1053 gfc_free_expr (open->blank);
1054 gfc_free_expr (open->position);
1055 gfc_free_expr (open->action);
1056 gfc_free_expr (open->delim);
1057 gfc_free_expr (open->pad);
1063 /* Resolve everything in a gfc_open structure. */
1066 gfc_resolve_open (gfc_open * open)
1069 RESOLVE_TAG (&tag_unit, open->unit);
1070 RESOLVE_TAG (&tag_iostat, open->iostat);
1071 RESOLVE_TAG (&tag_file, open->file);
1072 RESOLVE_TAG (&tag_status, open->status);
1073 RESOLVE_TAG (&tag_e_form, open->form);
1074 RESOLVE_TAG (&tag_e_recl, open->recl);
1076 RESOLVE_TAG (&tag_e_blank, open->blank);
1077 RESOLVE_TAG (&tag_e_position, open->position);
1078 RESOLVE_TAG (&tag_e_action, open->action);
1079 RESOLVE_TAG (&tag_e_delim, open->delim);
1080 RESOLVE_TAG (&tag_e_pad, open->pad);
1082 if (gfc_reference_st_label (open->err, ST_LABEL_TARGET) == FAILURE)
1089 /* Match an OPEN statmement. */
1092 gfc_match_open (void)
1097 m = gfc_match_char ('(');
1101 open = gfc_getmem (sizeof (gfc_open));
1103 m = match_open_element (open);
1105 if (m == MATCH_ERROR)
1109 m = gfc_match_expr (&open->unit);
1112 if (m == MATCH_ERROR)
1118 if (gfc_match_char (')') == MATCH_YES)
1120 if (gfc_match_char (',') != MATCH_YES)
1123 m = match_open_element (open);
1124 if (m == MATCH_ERROR)
1130 if (gfc_match_eos () == MATCH_NO)
1133 if (gfc_pure (NULL))
1135 gfc_error ("OPEN statement not allowed in PURE procedure at %C");
1139 new_st.op = EXEC_OPEN;
1140 new_st.ext.open = open;
1144 gfc_syntax_error (ST_OPEN);
1147 gfc_free_open (open);
1152 /* Free a gfc_close structure an all its expressions. */
1155 gfc_free_close (gfc_close * close)
1161 gfc_free_expr (close->unit);
1162 gfc_free_expr (close->iostat);
1163 gfc_free_expr (close->status);
1169 /* Match elements of a CLOSE statment. */
1172 match_close_element (gfc_close * close)
1176 m = match_etag (&tag_unit, &close->unit);
1179 m = match_etag (&tag_status, &close->status);
1182 m = match_vtag (&tag_iostat, &close->iostat);
1185 m = match_ltag (&tag_err, &close->err);
1193 /* Match a CLOSE statement. */
1196 gfc_match_close (void)
1201 m = gfc_match_char ('(');
1205 close = gfc_getmem (sizeof (gfc_close));
1207 m = match_close_element (close);
1209 if (m == MATCH_ERROR)
1213 m = gfc_match_expr (&close->unit);
1216 if (m == MATCH_ERROR)
1222 if (gfc_match_char (')') == MATCH_YES)
1224 if (gfc_match_char (',') != MATCH_YES)
1227 m = match_close_element (close);
1228 if (m == MATCH_ERROR)
1234 if (gfc_match_eos () == MATCH_NO)
1237 if (gfc_pure (NULL))
1239 gfc_error ("CLOSE statement not allowed in PURE procedure at %C");
1243 new_st.op = EXEC_CLOSE;
1244 new_st.ext.close = close;
1248 gfc_syntax_error (ST_CLOSE);
1251 gfc_free_close (close);
1256 /* Resolve everything in a gfc_close structure. */
1259 gfc_resolve_close (gfc_close * close)
1262 RESOLVE_TAG (&tag_unit, close->unit);
1263 RESOLVE_TAG (&tag_iostat, close->iostat);
1264 RESOLVE_TAG (&tag_status, close->status);
1266 if (gfc_reference_st_label (close->err, ST_LABEL_TARGET) == FAILURE)
1273 /* Free a gfc_filepos structure. */
1276 gfc_free_filepos (gfc_filepos * fp)
1279 gfc_free_expr (fp->unit);
1280 gfc_free_expr (fp->iostat);
1285 /* Match elements of a REWIND, BACKSPACE or ENDFILE statement. */
1288 match_file_element (gfc_filepos * fp)
1292 m = match_etag (&tag_unit, &fp->unit);
1295 m = match_vtag (&tag_iostat, &fp->iostat);
1298 m = match_ltag (&tag_err, &fp->err);
1306 /* Match the second half of the file-positioning statements, REWIND,
1307 BACKSPACE or ENDFILE. */
1310 match_filepos (gfc_statement st, gfc_exec_op op)
1315 fp = gfc_getmem (sizeof (gfc_filepos));
1317 if (gfc_match_char ('(') == MATCH_NO)
1319 m = gfc_match_expr (&fp->unit);
1320 if (m == MATCH_ERROR)
1328 m = match_file_element (fp);
1329 if (m == MATCH_ERROR)
1333 m = gfc_match_expr (&fp->unit);
1334 if (m == MATCH_ERROR)
1342 if (gfc_match_char (')') == MATCH_YES)
1344 if (gfc_match_char (',') != MATCH_YES)
1347 m = match_file_element (fp);
1348 if (m == MATCH_ERROR)
1355 if (gfc_match_eos () != MATCH_YES)
1358 if (gfc_pure (NULL))
1360 gfc_error ("%s statement not allowed in PURE procedure at %C",
1361 gfc_ascii_statement (st));
1367 new_st.ext.filepos = fp;
1371 gfc_syntax_error (st);
1374 gfc_free_filepos (fp);
1380 gfc_resolve_filepos (gfc_filepos * fp)
1383 RESOLVE_TAG (&tag_unit, fp->unit);
1384 if (gfc_reference_st_label (fp->err, ST_LABEL_TARGET) == FAILURE)
1391 /* Match the file positioning statements: ENDFILE, BACKSPACE or
1395 gfc_match_endfile (void)
1398 return match_filepos (ST_END_FILE, EXEC_ENDFILE);
1402 gfc_match_backspace (void)
1405 return match_filepos (ST_BACKSPACE, EXEC_BACKSPACE);
1409 gfc_match_rewind (void)
1412 return match_filepos (ST_REWIND, EXEC_REWIND);
1416 /******************** Data Transfer Statments *********************/
1419 { M_READ, M_WRITE, M_PRINT, M_INQUIRE }
1423 /* Return a default unit number. */
1426 default_unit (io_kind k)
1435 return gfc_int_expr (unit);
1439 /* Match a unit specification for a data transfer statement. */
1442 match_dt_unit (io_kind k, gfc_dt * dt)
1446 if (gfc_match_char ('*') == MATCH_YES)
1448 if (dt->io_unit != NULL)
1451 dt->io_unit = default_unit (k);
1455 if (gfc_match_expr (&e) == MATCH_YES)
1457 if (dt->io_unit != NULL)
1470 gfc_error ("Duplicate UNIT specification at %C");
1475 /* Match a format specification. */
1478 match_dt_format (gfc_dt * dt)
1482 gfc_st_label *label;
1484 where = gfc_current_locus;
1486 if (gfc_match_char ('*') == MATCH_YES)
1488 if (dt->format_expr != NULL || dt->format_label != NULL)
1491 dt->format_label = &format_asterisk;
1495 if (gfc_match_st_label (&label, 0) == MATCH_YES)
1497 if (dt->format_expr != NULL || dt->format_label != NULL)
1499 gfc_free_st_label (label);
1503 if (gfc_reference_st_label (label, ST_LABEL_FORMAT) == FAILURE)
1506 dt->format_label = label;
1510 if (gfc_match_expr (&e) == MATCH_YES)
1512 if (dt->format_expr != NULL || dt->format_label != NULL)
1517 if (e->ts.type == BT_INTEGER && e->rank == 0)
1518 e->symtree->n.sym->attr.assign = 1;
1520 dt->format_expr = e;
1524 gfc_current_locus = where; /* The only case where we have to restore */
1529 gfc_error ("Duplicate format specification at %C");
1534 /* Traverse a namelist that is part of a READ statement to make sure
1535 that none of the variables in the namelist are INTENT(IN). Returns
1536 nonzero if we find such a variable. */
1539 check_namelist (gfc_symbol * sym)
1543 for (p = sym->namelist; p; p = p->next)
1544 if (p->sym->attr.intent == INTENT_IN)
1546 gfc_error ("Symbol '%s' in namelist '%s' is INTENT(IN) at %C",
1547 p->sym->name, sym->name);
1555 /* Match a single data transfer element. */
1558 match_dt_element (io_kind k, gfc_dt * dt)
1560 char name[GFC_MAX_SYMBOL_LEN + 1];
1564 if (gfc_match (" unit =") == MATCH_YES)
1566 m = match_dt_unit (k, dt);
1571 if (gfc_match (" fmt =") == MATCH_YES)
1573 m = match_dt_format (dt);
1578 if (gfc_match (" nml = %n", name) == MATCH_YES)
1580 if (dt->namelist != NULL)
1582 gfc_error ("Duplicate NML specification at %C");
1586 if (gfc_find_symbol (name, NULL, 1, &sym))
1589 if (sym == NULL || sym->attr.flavor != FL_NAMELIST)
1591 gfc_error ("Symbol '%s' at %C must be a NAMELIST group name",
1592 sym != NULL ? sym->name : name);
1597 if (k == M_READ && check_namelist (sym))
1603 m = match_etag (&tag_rec, &dt->rec);
1606 m = match_vtag (&tag_iostat, &dt->iostat);
1609 m = match_ltag (&tag_err, &dt->err);
1612 m = match_etag (&tag_advance, &dt->advance);
1615 m = match_vtag (&tag_size, &dt->size);
1619 m = match_ltag (&tag_end, &dt->end);
1621 dt->end_where = gfc_current_locus;
1625 m = match_ltag (&tag_eor, &dt->eor);
1627 dt->eor_where = gfc_current_locus;
1635 /* Free a data transfer structure and everything below it. */
1638 gfc_free_dt (gfc_dt * dt)
1644 gfc_free_expr (dt->io_unit);
1645 gfc_free_expr (dt->format_expr);
1646 gfc_free_expr (dt->rec);
1647 gfc_free_expr (dt->advance);
1648 gfc_free_expr (dt->iostat);
1649 gfc_free_expr (dt->size);
1655 /* Resolve everything in a gfc_dt structure. */
1658 gfc_resolve_dt (gfc_dt * dt)
1662 RESOLVE_TAG (&tag_format, dt->format_expr);
1663 RESOLVE_TAG (&tag_rec, dt->rec);
1664 RESOLVE_TAG (&tag_advance, dt->advance);
1665 RESOLVE_TAG (&tag_iostat, dt->iostat);
1666 RESOLVE_TAG (&tag_size, dt->size);
1669 if (gfc_resolve_expr (e) == SUCCESS
1670 && (e->ts.type != BT_INTEGER
1671 && (e->ts.type != BT_CHARACTER
1672 || e->expr_type != EXPR_VARIABLE)))
1675 ("UNIT specification at %L must be an INTEGER expression or a "
1676 "CHARACTER variable", &e->where);
1680 /* Sanity checks on data transfer statements. */
1681 if (e->ts.type == BT_CHARACTER)
1683 if (dt->rec != NULL)
1685 gfc_error ("REC tag at %L is incompatible with internal file",
1690 if (dt->namelist != NULL)
1692 gfc_error ("Internal file at %L is incompatible with namelist",
1693 &dt->io_unit->where);
1697 if (dt->advance != NULL)
1699 gfc_error ("ADVANCE tag at %L is incompatible with internal file",
1700 &dt->advance->where);
1705 if (dt->rec != NULL)
1707 if (dt->end != NULL)
1709 gfc_error ("REC tag at %L is incompatible with END tag",
1714 if (dt->format_label == &format_asterisk)
1717 ("END tag at %L is incompatible with list directed format (*)",
1722 if (dt->namelist != NULL)
1724 gfc_error ("REC tag at %L is incompatible with namelist",
1730 if (dt->advance != NULL && dt->format_label == &format_asterisk)
1732 gfc_error ("ADVANCE tag at %L is incompatible with list directed "
1733 "format (*)", &dt->advance->where);
1737 if (dt->eor != 0 && dt->advance == NULL)
1739 gfc_error ("EOR tag at %L requires an ADVANCE tag", &dt->eor_where);
1743 if (dt->size != NULL && dt->advance == NULL)
1745 gfc_error ("SIZE tag at %L requires an ADVANCE tag", &dt->size->where);
1749 /* TODO: Make sure the ADVANCE tag is 'yes' or 'no' if it is a string
1752 if (gfc_reference_st_label (dt->err, ST_LABEL_TARGET) == FAILURE)
1755 if (gfc_reference_st_label (dt->end, ST_LABEL_TARGET) == FAILURE)
1758 if (gfc_reference_st_label (dt->eor, ST_LABEL_TARGET) == FAILURE)
1761 /* Check the format label ectually exists. */
1762 if (dt->format_label && dt->format_label != &format_asterisk
1763 && dt->format_label->defined == ST_LABEL_UNKNOWN)
1765 gfc_error ("FORMAT label %d at %L not defined", dt->format_label->value,
1766 &dt->format_label->where);
1773 /* Given an io_kind, return its name. */
1776 io_kind_name (io_kind k)
1795 gfc_internal_error ("io_kind_name(): bad I/O-kind");
1802 /* Match an IO iteration statement of the form:
1804 ( [<IO element> ,] <IO element>, I = <expr>, <expr> [, <expr> ] )
1806 which is equivalent to a single IO element. This function is
1807 mutually recursive with match_io_element(). */
1809 static match match_io_element (io_kind k, gfc_code **);
1812 match_io_iterator (io_kind k, gfc_code ** result)
1814 gfc_code *head, *tail, *new;
1822 old_loc = gfc_current_locus;
1824 if (gfc_match_char ('(') != MATCH_YES)
1827 m = match_io_element (k, &head);
1830 if (m != MATCH_YES || gfc_match_char (',') != MATCH_YES)
1836 /* Can't be anything but an IO iterator. Build a list. */
1837 iter = gfc_get_iterator ();
1841 m = gfc_match_iterator (iter, 0);
1842 if (m == MATCH_ERROR)
1847 m = match_io_element (k, &new);
1848 if (m == MATCH_ERROR)
1857 tail = gfc_append_code (tail, new);
1859 if (gfc_match_char (',') != MATCH_YES)
1868 if (gfc_match_char (')') != MATCH_YES)
1871 new = gfc_get_code ();
1873 new->ext.iterator = iter;
1875 new->block = gfc_get_code ();
1876 new->block->op = EXEC_DO;
1877 new->block->next = head;
1883 gfc_error ("Syntax error in I/O iterator at %C");
1887 gfc_free_iterator (iter, 1);
1888 gfc_free_statements (head);
1889 gfc_current_locus = old_loc;
1894 /* Match a single element of an IO list, which is either a single
1895 expression or an IO Iterator. */
1898 match_io_element (io_kind k, gfc_code ** cpp)
1906 m = match_io_iterator (k, cpp);
1912 m = gfc_match_variable (&expr, 0);
1914 gfc_error ("Expected variable in READ statement at %C");
1918 m = gfc_match_expr (&expr);
1920 gfc_error ("Expected expression in %s statement at %C",
1928 if (expr->symtree->n.sym->attr.intent == INTENT_IN)
1931 ("Variable '%s' in input list at %C cannot be INTENT(IN)",
1932 expr->symtree->n.sym->name);
1937 && gfc_impure_variable (expr->symtree->n.sym)
1938 && current_dt->io_unit->ts.type == BT_CHARACTER)
1940 gfc_error ("Cannot read to variable '%s' in PURE procedure at %C",
1941 expr->symtree->n.sym->name);
1948 if (current_dt->io_unit->ts.type == BT_CHARACTER
1950 && current_dt->io_unit->expr_type == EXPR_VARIABLE
1951 && gfc_impure_variable (current_dt->io_unit->symtree->n.sym))
1954 ("Cannot write to internal file unit '%s' at %C inside a "
1955 "PURE procedure", current_dt->io_unit->symtree->n.sym->name);
1967 gfc_free_expr (expr);
1971 cp = gfc_get_code ();
1972 cp->op = EXEC_TRANSFER;
1980 /* Match an I/O list, building gfc_code structures as we go. */
1983 match_io_list (io_kind k, gfc_code ** head_p)
1985 gfc_code *head, *tail, *new;
1988 *head_p = head = tail = NULL;
1989 if (gfc_match_eos () == MATCH_YES)
1994 m = match_io_element (k, &new);
1995 if (m == MATCH_ERROR)
2000 tail = gfc_append_code (tail, new);
2004 if (gfc_match_eos () == MATCH_YES)
2006 if (gfc_match_char (',') != MATCH_YES)
2014 gfc_error ("Syntax error in %s statement at %C", io_kind_name (k));
2017 gfc_free_statements (head);
2022 /* Attach the data transfer end node. */
2025 terminate_io (gfc_code * io_code)
2029 if (io_code == NULL)
2032 c = gfc_get_code ();
2033 c->op = EXEC_DT_END;
2035 /* Point to structure that is already there */
2036 c->ext.dt = new_st.ext.dt;
2037 gfc_append_code (io_code, c);
2041 /* Match a READ, WRITE or PRINT statement. */
2044 match_io (io_kind k)
2046 char name[GFC_MAX_SYMBOL_LEN + 1];
2056 current_dt = dt = gfc_getmem (sizeof (gfc_dt));
2058 if (gfc_match_char ('(') == MATCH_NO)
2063 if (gfc_current_form == FORM_FREE)
2065 c = gfc_peek_char();
2066 if (c != ' ' && c != '*' && c != '\'' && c != '"')
2073 m = match_dt_format (dt);
2074 if (m == MATCH_ERROR)
2080 dt->io_unit = default_unit (k);
2084 /* Match a control list */
2085 if (match_dt_element (k, dt) == MATCH_YES)
2087 if (match_dt_unit (k, dt) != MATCH_YES)
2090 if (gfc_match_char (')') == MATCH_YES)
2092 if (gfc_match_char (',') != MATCH_YES)
2095 m = match_dt_element (k, dt);
2098 if (m == MATCH_ERROR)
2101 m = match_dt_format (dt);
2104 if (m == MATCH_ERROR)
2107 where = gfc_current_locus;
2109 if (gfc_match_name (name) == MATCH_YES
2110 && !gfc_find_symbol (name, NULL, 1, &sym)
2111 && sym->attr.flavor == FL_NAMELIST)
2114 if (k == M_READ && check_namelist (sym))
2122 gfc_current_locus = where;
2124 goto loop; /* No matches, try regular elements */
2127 if (gfc_match_char (')') == MATCH_YES)
2129 if (gfc_match_char (',') != MATCH_YES)
2135 m = match_dt_element (k, dt);
2138 if (m == MATCH_ERROR)
2141 if (gfc_match_char (')') == MATCH_YES)
2143 if (gfc_match_char (',') != MATCH_YES)
2148 /* Optional leading comma (non-standard). */
2150 && gfc_match_char (',') == MATCH_YES
2152 && gfc_notify_std (GFC_STD_GNU, "Comma before output item list "
2153 "at %C is an extension") == FAILURE)
2157 if (gfc_match_eos () != MATCH_YES)
2159 if (comma_flag && gfc_match_char (',') != MATCH_YES)
2161 gfc_error ("Expected comma in I/O list at %C");
2166 m = match_io_list (k, &io_code);
2167 if (m == MATCH_ERROR)
2173 /* A full IO statement has been matched. */
2174 if (dt->io_unit->expr_type == EXPR_VARIABLE
2176 && dt->io_unit->ts.type == BT_CHARACTER
2177 && dt->io_unit->symtree->n.sym->attr.intent == INTENT_IN)
2179 gfc_error ("Internal file '%s' at %L is INTENT(IN)",
2180 dt->io_unit->symtree->n.sym->name, &dt->io_unit->where);
2185 expr = dt->format_expr;
2187 if (expr != NULL && expr->expr_type == EXPR_CONSTANT)
2188 check_format_string (expr);
2191 && (k == M_READ || k == M_WRITE)
2192 && dt->io_unit->ts.type != BT_CHARACTER)
2195 ("io-unit in %s statement at %C must be an internal file in a "
2196 "PURE procedure", io_kind_name (k));
2201 new_st.op = (k == M_READ) ? EXEC_READ : EXEC_WRITE;
2203 new_st.next = io_code;
2205 terminate_io (io_code);
2210 gfc_error ("Syntax error in %s statement at %C", io_kind_name (k));
2220 gfc_match_read (void)
2222 return match_io (M_READ);
2226 gfc_match_write (void)
2228 return match_io (M_WRITE);
2232 gfc_match_print (void)
2236 m = match_io (M_PRINT);
2240 if (gfc_pure (NULL))
2242 gfc_error ("PRINT statement at %C not allowed within PURE procedure");
2250 /* Free a gfc_inquire structure. */
2253 gfc_free_inquire (gfc_inquire * inquire)
2256 if (inquire == NULL)
2259 gfc_free_expr (inquire->unit);
2260 gfc_free_expr (inquire->file);
2261 gfc_free_expr (inquire->iostat);
2262 gfc_free_expr (inquire->exist);
2263 gfc_free_expr (inquire->opened);
2264 gfc_free_expr (inquire->number);
2265 gfc_free_expr (inquire->named);
2266 gfc_free_expr (inquire->name);
2267 gfc_free_expr (inquire->access);
2268 gfc_free_expr (inquire->sequential);
2269 gfc_free_expr (inquire->direct);
2270 gfc_free_expr (inquire->form);
2271 gfc_free_expr (inquire->formatted);
2272 gfc_free_expr (inquire->unformatted);
2273 gfc_free_expr (inquire->recl);
2274 gfc_free_expr (inquire->nextrec);
2275 gfc_free_expr (inquire->blank);
2276 gfc_free_expr (inquire->position);
2277 gfc_free_expr (inquire->action);
2278 gfc_free_expr (inquire->read);
2279 gfc_free_expr (inquire->write);
2280 gfc_free_expr (inquire->readwrite);
2281 gfc_free_expr (inquire->delim);
2282 gfc_free_expr (inquire->pad);
2283 gfc_free_expr (inquire->iolength);
2289 /* Match an element of an INQUIRE statement. */
2291 #define RETM if (m != MATCH_NO) return m;
2294 match_inquire_element (gfc_inquire * inquire)
2298 m = match_etag (&tag_unit, &inquire->unit);
2299 RETM m = match_etag (&tag_file, &inquire->file);
2300 RETM m = match_ltag (&tag_err, &inquire->err);
2301 RETM m = match_vtag (&tag_iostat, &inquire->iostat);
2302 RETM m = match_vtag (&tag_exist, &inquire->exist);
2303 RETM m = match_vtag (&tag_opened, &inquire->opened);
2304 RETM m = match_vtag (&tag_named, &inquire->named);
2305 RETM m = match_vtag (&tag_name, &inquire->name);
2306 RETM m = match_vtag (&tag_number, &inquire->number);
2307 RETM m = match_vtag (&tag_s_access, &inquire->access);
2308 RETM m = match_vtag (&tag_sequential, &inquire->sequential);
2309 RETM m = match_vtag (&tag_direct, &inquire->direct);
2310 RETM m = match_vtag (&tag_s_form, &inquire->form);
2311 RETM m = match_vtag (&tag_formatted, &inquire->formatted);
2312 RETM m = match_vtag (&tag_unformatted, &inquire->unformatted);
2313 RETM m = match_vtag (&tag_s_recl, &inquire->recl);
2314 RETM m = match_vtag (&tag_nextrec, &inquire->nextrec);
2315 RETM m = match_vtag (&tag_s_blank, &inquire->blank);
2316 RETM m = match_vtag (&tag_s_position, &inquire->position);
2317 RETM m = match_vtag (&tag_s_action, &inquire->action);
2318 RETM m = match_vtag (&tag_read, &inquire->read);
2319 RETM m = match_vtag (&tag_write, &inquire->write);
2320 RETM m = match_vtag (&tag_readwrite, &inquire->readwrite);
2321 RETM m = match_vtag (&tag_s_delim, &inquire->delim);
2322 RETM m = match_vtag (&tag_s_pad, &inquire->pad);
2323 RETM m = match_vtag (&tag_iolength, &inquire->iolength);
2324 RETM return MATCH_NO;
2331 gfc_match_inquire (void)
2333 gfc_inquire *inquire;
2337 m = gfc_match_char ('(');
2341 inquire = gfc_getmem (sizeof (gfc_inquire));
2343 m = match_inquire_element (inquire);
2344 if (m == MATCH_ERROR)
2348 m = gfc_match_expr (&inquire->unit);
2349 if (m == MATCH_ERROR)
2355 /* See if we have the IOLENGTH form of the inquire statement. */
2356 if (inquire->iolength != NULL)
2358 if (gfc_match_char (')') != MATCH_YES)
2361 m = match_io_list (M_INQUIRE, &code);
2362 if (m == MATCH_ERROR)
2367 terminate_io (code);
2369 new_st.op = EXEC_IOLENGTH;
2370 new_st.expr = inquire->iolength;
2371 new_st.ext.inquire = inquire;
2373 if (gfc_pure (NULL))
2375 gfc_free_statements (code);
2376 gfc_error ("INQUIRE statement not allowed in PURE procedure at %C");
2384 /* At this point, we have the non-IOLENGTH inquire statement. */
2387 if (gfc_match_char (')') == MATCH_YES)
2389 if (gfc_match_char (',') != MATCH_YES)
2392 m = match_inquire_element (inquire);
2393 if (m == MATCH_ERROR)
2398 if (inquire->iolength != NULL)
2400 gfc_error ("IOLENGTH tag invalid in INQUIRE statement at %C");
2405 if (gfc_match_eos () != MATCH_YES)
2408 if (gfc_pure (NULL))
2410 gfc_error ("INQUIRE statement not allowed in PURE procedure at %C");
2414 new_st.op = EXEC_INQUIRE;
2415 new_st.ext.inquire = inquire;
2419 gfc_syntax_error (ST_INQUIRE);
2422 gfc_free_inquire (inquire);
2427 /* Resolve everything in a gfc_inquire structure. */
2430 gfc_resolve_inquire (gfc_inquire * inquire)
2433 RESOLVE_TAG (&tag_unit, inquire->unit);
2434 RESOLVE_TAG (&tag_file, inquire->file);
2435 RESOLVE_TAG (&tag_iostat, inquire->iostat);
2436 RESOLVE_TAG (&tag_exist, inquire->exist);
2437 RESOLVE_TAG (&tag_opened, inquire->opened);
2438 RESOLVE_TAG (&tag_number, inquire->number);
2439 RESOLVE_TAG (&tag_named, inquire->named);
2440 RESOLVE_TAG (&tag_name, inquire->name);
2441 RESOLVE_TAG (&tag_s_access, inquire->access);
2442 RESOLVE_TAG (&tag_sequential, inquire->sequential);
2443 RESOLVE_TAG (&tag_direct, inquire->direct);
2444 RESOLVE_TAG (&tag_s_form, inquire->form);
2445 RESOLVE_TAG (&tag_formatted, inquire->formatted);
2446 RESOLVE_TAG (&tag_unformatted, inquire->unformatted);
2447 RESOLVE_TAG (&tag_s_recl, inquire->recl);
2448 RESOLVE_TAG (&tag_nextrec, inquire->nextrec);
2449 RESOLVE_TAG (&tag_s_blank, inquire->blank);
2450 RESOLVE_TAG (&tag_s_position, inquire->position);
2451 RESOLVE_TAG (&tag_s_action, inquire->action);
2452 RESOLVE_TAG (&tag_read, inquire->read);
2453 RESOLVE_TAG (&tag_write, inquire->write);
2454 RESOLVE_TAG (&tag_readwrite, inquire->readwrite);
2455 RESOLVE_TAG (&tag_s_delim, inquire->delim);
2456 RESOLVE_TAG (&tag_s_pad, inquire->pad);
2457 RESOLVE_TAG (&tag_iolength, inquire->iolength);
2459 if (gfc_reference_st_label (inquire->err, ST_LABEL_TARGET) == FAILURE)