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 I/O tags that cause variables to become redefined. */
924 match_out_tag(const io_tag *tag, gfc_expr **result)
928 m = match_vtag(tag, result);
930 gfc_check_do_variable((*result)->symtree);
936 /* Match a label I/O tag. */
939 match_ltag (const io_tag * tag, gfc_st_label ** label)
945 m = gfc_match (tag->spec, label);
946 if (m == MATCH_YES && old != 0)
948 gfc_error ("Duplicate %s label specification at %C", tag->name);
956 /* Do expression resolution and type-checking on an expression tag. */
959 resolve_tag (const io_tag * tag, gfc_expr * e)
965 if (gfc_resolve_expr (e) == FAILURE)
968 if (e->ts.type != tag->type)
970 /* Format label can be integer varibale. */
971 if (tag != &tag_format)
973 gfc_error ("%s tag at %L must be of type %s", tag->name, &e->where,
974 gfc_basic_typename (tag->type));
979 if (tag == &tag_format)
981 if (e->rank != 1 && e->rank != 0)
983 gfc_error ("FORMAT tag at %L cannot be array of strings",
992 gfc_error ("%s tag at %L must be scalar", tag->name, &e->where);
1001 /* Match a single tag of an OPEN statement. */
1004 match_open_element (gfc_open * open)
1008 m = match_etag (&tag_unit, &open->unit);
1011 m = match_out_tag (&tag_iostat, &open->iostat);
1014 m = match_etag (&tag_file, &open->file);
1017 m = match_etag (&tag_status, &open->status);
1020 m = match_etag (&tag_e_access, &open->access);
1023 m = match_etag (&tag_e_form, &open->form);
1026 m = match_etag (&tag_e_recl, &open->recl);
1029 m = match_etag (&tag_e_blank, &open->blank);
1032 m = match_etag (&tag_e_position, &open->position);
1035 m = match_etag (&tag_e_action, &open->action);
1038 m = match_etag (&tag_e_delim, &open->delim);
1041 m = match_etag (&tag_e_pad, &open->pad);
1044 m = match_ltag (&tag_err, &open->err);
1052 /* Free the gfc_open structure and all the expressions it contains. */
1055 gfc_free_open (gfc_open * open)
1061 gfc_free_expr (open->unit);
1062 gfc_free_expr (open->iostat);
1063 gfc_free_expr (open->file);
1064 gfc_free_expr (open->status);
1065 gfc_free_expr (open->access);
1066 gfc_free_expr (open->form);
1067 gfc_free_expr (open->recl);
1068 gfc_free_expr (open->blank);
1069 gfc_free_expr (open->position);
1070 gfc_free_expr (open->action);
1071 gfc_free_expr (open->delim);
1072 gfc_free_expr (open->pad);
1078 /* Resolve everything in a gfc_open structure. */
1081 gfc_resolve_open (gfc_open * open)
1084 RESOLVE_TAG (&tag_unit, open->unit);
1085 RESOLVE_TAG (&tag_iostat, open->iostat);
1086 RESOLVE_TAG (&tag_file, open->file);
1087 RESOLVE_TAG (&tag_status, open->status);
1088 RESOLVE_TAG (&tag_e_form, open->form);
1089 RESOLVE_TAG (&tag_e_recl, open->recl);
1091 RESOLVE_TAG (&tag_e_blank, open->blank);
1092 RESOLVE_TAG (&tag_e_position, open->position);
1093 RESOLVE_TAG (&tag_e_action, open->action);
1094 RESOLVE_TAG (&tag_e_delim, open->delim);
1095 RESOLVE_TAG (&tag_e_pad, open->pad);
1097 if (gfc_reference_st_label (open->err, ST_LABEL_TARGET) == FAILURE)
1104 /* Match an OPEN statmement. */
1107 gfc_match_open (void)
1112 m = gfc_match_char ('(');
1116 open = gfc_getmem (sizeof (gfc_open));
1118 m = match_open_element (open);
1120 if (m == MATCH_ERROR)
1124 m = gfc_match_expr (&open->unit);
1127 if (m == MATCH_ERROR)
1133 if (gfc_match_char (')') == MATCH_YES)
1135 if (gfc_match_char (',') != MATCH_YES)
1138 m = match_open_element (open);
1139 if (m == MATCH_ERROR)
1145 if (gfc_match_eos () == MATCH_NO)
1148 if (gfc_pure (NULL))
1150 gfc_error ("OPEN statement not allowed in PURE procedure at %C");
1154 new_st.op = EXEC_OPEN;
1155 new_st.ext.open = open;
1159 gfc_syntax_error (ST_OPEN);
1162 gfc_free_open (open);
1167 /* Free a gfc_close structure an all its expressions. */
1170 gfc_free_close (gfc_close * close)
1176 gfc_free_expr (close->unit);
1177 gfc_free_expr (close->iostat);
1178 gfc_free_expr (close->status);
1184 /* Match elements of a CLOSE statment. */
1187 match_close_element (gfc_close * close)
1191 m = match_etag (&tag_unit, &close->unit);
1194 m = match_etag (&tag_status, &close->status);
1197 m = match_out_tag (&tag_iostat, &close->iostat);
1200 m = match_ltag (&tag_err, &close->err);
1208 /* Match a CLOSE statement. */
1211 gfc_match_close (void)
1216 m = gfc_match_char ('(');
1220 close = gfc_getmem (sizeof (gfc_close));
1222 m = match_close_element (close);
1224 if (m == MATCH_ERROR)
1228 m = gfc_match_expr (&close->unit);
1231 if (m == MATCH_ERROR)
1237 if (gfc_match_char (')') == MATCH_YES)
1239 if (gfc_match_char (',') != MATCH_YES)
1242 m = match_close_element (close);
1243 if (m == MATCH_ERROR)
1249 if (gfc_match_eos () == MATCH_NO)
1252 if (gfc_pure (NULL))
1254 gfc_error ("CLOSE statement not allowed in PURE procedure at %C");
1258 new_st.op = EXEC_CLOSE;
1259 new_st.ext.close = close;
1263 gfc_syntax_error (ST_CLOSE);
1266 gfc_free_close (close);
1271 /* Resolve everything in a gfc_close structure. */
1274 gfc_resolve_close (gfc_close * close)
1277 RESOLVE_TAG (&tag_unit, close->unit);
1278 RESOLVE_TAG (&tag_iostat, close->iostat);
1279 RESOLVE_TAG (&tag_status, close->status);
1281 if (gfc_reference_st_label (close->err, ST_LABEL_TARGET) == FAILURE)
1288 /* Free a gfc_filepos structure. */
1291 gfc_free_filepos (gfc_filepos * fp)
1294 gfc_free_expr (fp->unit);
1295 gfc_free_expr (fp->iostat);
1300 /* Match elements of a REWIND, BACKSPACE or ENDFILE statement. */
1303 match_file_element (gfc_filepos * fp)
1307 m = match_etag (&tag_unit, &fp->unit);
1310 m = match_out_tag (&tag_iostat, &fp->iostat);
1313 m = match_ltag (&tag_err, &fp->err);
1321 /* Match the second half of the file-positioning statements, REWIND,
1322 BACKSPACE or ENDFILE. */
1325 match_filepos (gfc_statement st, gfc_exec_op op)
1330 fp = gfc_getmem (sizeof (gfc_filepos));
1332 if (gfc_match_char ('(') == MATCH_NO)
1334 m = gfc_match_expr (&fp->unit);
1335 if (m == MATCH_ERROR)
1343 m = match_file_element (fp);
1344 if (m == MATCH_ERROR)
1348 m = gfc_match_expr (&fp->unit);
1349 if (m == MATCH_ERROR)
1357 if (gfc_match_char (')') == MATCH_YES)
1359 if (gfc_match_char (',') != MATCH_YES)
1362 m = match_file_element (fp);
1363 if (m == MATCH_ERROR)
1370 if (gfc_match_eos () != MATCH_YES)
1373 if (gfc_pure (NULL))
1375 gfc_error ("%s statement not allowed in PURE procedure at %C",
1376 gfc_ascii_statement (st));
1382 new_st.ext.filepos = fp;
1386 gfc_syntax_error (st);
1389 gfc_free_filepos (fp);
1395 gfc_resolve_filepos (gfc_filepos * fp)
1398 RESOLVE_TAG (&tag_unit, fp->unit);
1399 if (gfc_reference_st_label (fp->err, ST_LABEL_TARGET) == FAILURE)
1406 /* Match the file positioning statements: ENDFILE, BACKSPACE or
1410 gfc_match_endfile (void)
1413 return match_filepos (ST_END_FILE, EXEC_ENDFILE);
1417 gfc_match_backspace (void)
1420 return match_filepos (ST_BACKSPACE, EXEC_BACKSPACE);
1424 gfc_match_rewind (void)
1427 return match_filepos (ST_REWIND, EXEC_REWIND);
1431 /******************** Data Transfer Statments *********************/
1434 { M_READ, M_WRITE, M_PRINT, M_INQUIRE }
1438 /* Return a default unit number. */
1441 default_unit (io_kind k)
1450 return gfc_int_expr (unit);
1454 /* Match a unit specification for a data transfer statement. */
1457 match_dt_unit (io_kind k, gfc_dt * dt)
1461 if (gfc_match_char ('*') == MATCH_YES)
1463 if (dt->io_unit != NULL)
1466 dt->io_unit = default_unit (k);
1470 if (gfc_match_expr (&e) == MATCH_YES)
1472 if (dt->io_unit != NULL)
1485 gfc_error ("Duplicate UNIT specification at %C");
1490 /* Match a format specification. */
1493 match_dt_format (gfc_dt * dt)
1497 gfc_st_label *label;
1499 where = gfc_current_locus;
1501 if (gfc_match_char ('*') == MATCH_YES)
1503 if (dt->format_expr != NULL || dt->format_label != NULL)
1506 dt->format_label = &format_asterisk;
1510 if (gfc_match_st_label (&label, 0) == MATCH_YES)
1512 if (dt->format_expr != NULL || dt->format_label != NULL)
1514 gfc_free_st_label (label);
1518 if (gfc_reference_st_label (label, ST_LABEL_FORMAT) == FAILURE)
1521 dt->format_label = label;
1525 if (gfc_match_expr (&e) == MATCH_YES)
1527 if (dt->format_expr != NULL || dt->format_label != NULL)
1532 if (e->ts.type == BT_INTEGER && e->rank == 0)
1533 e->symtree->n.sym->attr.assign = 1;
1535 dt->format_expr = e;
1539 gfc_current_locus = where; /* The only case where we have to restore */
1544 gfc_error ("Duplicate format specification at %C");
1549 /* Traverse a namelist that is part of a READ statement to make sure
1550 that none of the variables in the namelist are INTENT(IN). Returns
1551 nonzero if we find such a variable. */
1554 check_namelist (gfc_symbol * sym)
1558 for (p = sym->namelist; p; p = p->next)
1559 if (p->sym->attr.intent == INTENT_IN)
1561 gfc_error ("Symbol '%s' in namelist '%s' is INTENT(IN) at %C",
1562 p->sym->name, sym->name);
1570 /* Match a single data transfer element. */
1573 match_dt_element (io_kind k, gfc_dt * dt)
1575 char name[GFC_MAX_SYMBOL_LEN + 1];
1579 if (gfc_match (" unit =") == MATCH_YES)
1581 m = match_dt_unit (k, dt);
1586 if (gfc_match (" fmt =") == MATCH_YES)
1588 m = match_dt_format (dt);
1593 if (gfc_match (" nml = %n", name) == MATCH_YES)
1595 if (dt->namelist != NULL)
1597 gfc_error ("Duplicate NML specification at %C");
1601 if (gfc_find_symbol (name, NULL, 1, &sym))
1604 if (sym == NULL || sym->attr.flavor != FL_NAMELIST)
1606 gfc_error ("Symbol '%s' at %C must be a NAMELIST group name",
1607 sym != NULL ? sym->name : name);
1612 if (k == M_READ && check_namelist (sym))
1618 m = match_etag (&tag_rec, &dt->rec);
1621 m = match_out_tag (&tag_iostat, &dt->iostat);
1624 m = match_ltag (&tag_err, &dt->err);
1627 m = match_etag (&tag_advance, &dt->advance);
1630 m = match_out_tag (&tag_size, &dt->size);
1634 m = match_ltag (&tag_end, &dt->end);
1636 dt->end_where = gfc_current_locus;
1640 m = match_ltag (&tag_eor, &dt->eor);
1642 dt->eor_where = gfc_current_locus;
1650 /* Free a data transfer structure and everything below it. */
1653 gfc_free_dt (gfc_dt * dt)
1659 gfc_free_expr (dt->io_unit);
1660 gfc_free_expr (dt->format_expr);
1661 gfc_free_expr (dt->rec);
1662 gfc_free_expr (dt->advance);
1663 gfc_free_expr (dt->iostat);
1664 gfc_free_expr (dt->size);
1670 /* Resolve everything in a gfc_dt structure. */
1673 gfc_resolve_dt (gfc_dt * dt)
1677 RESOLVE_TAG (&tag_format, dt->format_expr);
1678 RESOLVE_TAG (&tag_rec, dt->rec);
1679 RESOLVE_TAG (&tag_advance, dt->advance);
1680 RESOLVE_TAG (&tag_iostat, dt->iostat);
1681 RESOLVE_TAG (&tag_size, dt->size);
1684 if (gfc_resolve_expr (e) == SUCCESS
1685 && (e->ts.type != BT_INTEGER
1686 && (e->ts.type != BT_CHARACTER
1687 || e->expr_type != EXPR_VARIABLE)))
1690 ("UNIT specification at %L must be an INTEGER expression or a "
1691 "CHARACTER variable", &e->where);
1695 /* Sanity checks on data transfer statements. */
1696 if (e->ts.type == BT_CHARACTER)
1698 if (dt->rec != NULL)
1700 gfc_error ("REC tag at %L is incompatible with internal file",
1705 if (dt->namelist != NULL)
1707 gfc_error ("Internal file at %L is incompatible with namelist",
1708 &dt->io_unit->where);
1712 if (dt->advance != NULL)
1714 gfc_error ("ADVANCE tag at %L is incompatible with internal file",
1715 &dt->advance->where);
1720 if (dt->rec != NULL)
1722 if (dt->end != NULL)
1724 gfc_error ("REC tag at %L is incompatible with END tag",
1729 if (dt->format_label == &format_asterisk)
1732 ("END tag at %L is incompatible with list directed format (*)",
1737 if (dt->namelist != NULL)
1739 gfc_error ("REC tag at %L is incompatible with namelist",
1745 if (dt->advance != NULL && dt->format_label == &format_asterisk)
1747 gfc_error ("ADVANCE tag at %L is incompatible with list directed "
1748 "format (*)", &dt->advance->where);
1752 if (dt->eor != 0 && dt->advance == NULL)
1754 gfc_error ("EOR tag at %L requires an ADVANCE tag", &dt->eor_where);
1758 if (dt->size != NULL && dt->advance == NULL)
1760 gfc_error ("SIZE tag at %L requires an ADVANCE tag", &dt->size->where);
1764 /* TODO: Make sure the ADVANCE tag is 'yes' or 'no' if it is a string
1767 if (gfc_reference_st_label (dt->err, ST_LABEL_TARGET) == FAILURE)
1770 if (gfc_reference_st_label (dt->end, ST_LABEL_TARGET) == FAILURE)
1773 if (gfc_reference_st_label (dt->eor, ST_LABEL_TARGET) == FAILURE)
1776 /* Check the format label ectually exists. */
1777 if (dt->format_label && dt->format_label != &format_asterisk
1778 && dt->format_label->defined == ST_LABEL_UNKNOWN)
1780 gfc_error ("FORMAT label %d at %L not defined", dt->format_label->value,
1781 &dt->format_label->where);
1788 /* Given an io_kind, return its name. */
1791 io_kind_name (io_kind k)
1810 gfc_internal_error ("io_kind_name(): bad I/O-kind");
1817 /* Match an IO iteration statement of the form:
1819 ( [<IO element> ,] <IO element>, I = <expr>, <expr> [, <expr> ] )
1821 which is equivalent to a single IO element. This function is
1822 mutually recursive with match_io_element(). */
1824 static match match_io_element (io_kind k, gfc_code **);
1827 match_io_iterator (io_kind k, gfc_code ** result)
1829 gfc_code *head, *tail, *new;
1837 old_loc = gfc_current_locus;
1839 if (gfc_match_char ('(') != MATCH_YES)
1842 m = match_io_element (k, &head);
1845 if (m != MATCH_YES || gfc_match_char (',') != MATCH_YES)
1851 /* Can't be anything but an IO iterator. Build a list. */
1852 iter = gfc_get_iterator ();
1856 m = gfc_match_iterator (iter, 0);
1857 if (m == MATCH_ERROR)
1861 gfc_check_do_variable (iter->var->symtree);
1865 m = match_io_element (k, &new);
1866 if (m == MATCH_ERROR)
1875 tail = gfc_append_code (tail, new);
1877 if (gfc_match_char (',') != MATCH_YES)
1886 if (gfc_match_char (')') != MATCH_YES)
1889 new = gfc_get_code ();
1891 new->ext.iterator = iter;
1893 new->block = gfc_get_code ();
1894 new->block->op = EXEC_DO;
1895 new->block->next = head;
1901 gfc_error ("Syntax error in I/O iterator at %C");
1905 gfc_free_iterator (iter, 1);
1906 gfc_free_statements (head);
1907 gfc_current_locus = old_loc;
1912 /* Match a single element of an IO list, which is either a single
1913 expression or an IO Iterator. */
1916 match_io_element (io_kind k, gfc_code ** cpp)
1924 m = match_io_iterator (k, cpp);
1930 m = gfc_match_variable (&expr, 0);
1932 gfc_error ("Expected variable in READ statement at %C");
1936 m = gfc_match_expr (&expr);
1938 gfc_error ("Expected expression in %s statement at %C",
1946 if (expr->symtree->n.sym->attr.intent == INTENT_IN)
1949 ("Variable '%s' in input list at %C cannot be INTENT(IN)",
1950 expr->symtree->n.sym->name);
1955 && gfc_impure_variable (expr->symtree->n.sym)
1956 && current_dt->io_unit->ts.type == BT_CHARACTER)
1958 gfc_error ("Cannot read to variable '%s' in PURE procedure at %C",
1959 expr->symtree->n.sym->name);
1963 if (gfc_check_do_variable (expr->symtree))
1969 if (current_dt->io_unit->ts.type == BT_CHARACTER
1971 && current_dt->io_unit->expr_type == EXPR_VARIABLE
1972 && gfc_impure_variable (current_dt->io_unit->symtree->n.sym))
1975 ("Cannot write to internal file unit '%s' at %C inside a "
1976 "PURE procedure", current_dt->io_unit->symtree->n.sym->name);
1988 gfc_free_expr (expr);
1992 cp = gfc_get_code ();
1993 cp->op = EXEC_TRANSFER;
2001 /* Match an I/O list, building gfc_code structures as we go. */
2004 match_io_list (io_kind k, gfc_code ** head_p)
2006 gfc_code *head, *tail, *new;
2009 *head_p = head = tail = NULL;
2010 if (gfc_match_eos () == MATCH_YES)
2015 m = match_io_element (k, &new);
2016 if (m == MATCH_ERROR)
2021 tail = gfc_append_code (tail, new);
2025 if (gfc_match_eos () == MATCH_YES)
2027 if (gfc_match_char (',') != MATCH_YES)
2035 gfc_error ("Syntax error in %s statement at %C", io_kind_name (k));
2038 gfc_free_statements (head);
2043 /* Attach the data transfer end node. */
2046 terminate_io (gfc_code * io_code)
2050 if (io_code == NULL)
2053 c = gfc_get_code ();
2054 c->op = EXEC_DT_END;
2056 /* Point to structure that is already there */
2057 c->ext.dt = new_st.ext.dt;
2058 gfc_append_code (io_code, c);
2062 /* Match a READ, WRITE or PRINT statement. */
2065 match_io (io_kind k)
2067 char name[GFC_MAX_SYMBOL_LEN + 1];
2077 current_dt = dt = gfc_getmem (sizeof (gfc_dt));
2079 if (gfc_match_char ('(') == MATCH_NO)
2084 if (gfc_current_form == FORM_FREE)
2086 c = gfc_peek_char();
2087 if (c != ' ' && c != '*' && c != '\'' && c != '"')
2094 m = match_dt_format (dt);
2095 if (m == MATCH_ERROR)
2101 dt->io_unit = default_unit (k);
2105 /* Match a control list */
2106 if (match_dt_element (k, dt) == MATCH_YES)
2108 if (match_dt_unit (k, dt) != MATCH_YES)
2111 if (gfc_match_char (')') == MATCH_YES)
2113 if (gfc_match_char (',') != MATCH_YES)
2116 m = match_dt_element (k, dt);
2119 if (m == MATCH_ERROR)
2122 m = match_dt_format (dt);
2125 if (m == MATCH_ERROR)
2128 where = gfc_current_locus;
2130 if (gfc_match_name (name) == MATCH_YES
2131 && !gfc_find_symbol (name, NULL, 1, &sym)
2132 && sym->attr.flavor == FL_NAMELIST)
2135 if (k == M_READ && check_namelist (sym))
2143 gfc_current_locus = where;
2145 goto loop; /* No matches, try regular elements */
2148 if (gfc_match_char (')') == MATCH_YES)
2150 if (gfc_match_char (',') != MATCH_YES)
2156 m = match_dt_element (k, dt);
2159 if (m == MATCH_ERROR)
2162 if (gfc_match_char (')') == MATCH_YES)
2164 if (gfc_match_char (',') != MATCH_YES)
2169 /* Optional leading comma (non-standard). */
2171 && gfc_match_char (',') == MATCH_YES
2173 && gfc_notify_std (GFC_STD_GNU, "Extension: Comma before output "
2174 "item list at %C is an extension") == FAILURE)
2178 if (gfc_match_eos () != MATCH_YES)
2180 if (comma_flag && gfc_match_char (',') != MATCH_YES)
2182 gfc_error ("Expected comma in I/O list at %C");
2187 m = match_io_list (k, &io_code);
2188 if (m == MATCH_ERROR)
2194 /* A full IO statement has been matched. */
2195 if (dt->io_unit->expr_type == EXPR_VARIABLE
2197 && dt->io_unit->ts.type == BT_CHARACTER
2198 && dt->io_unit->symtree->n.sym->attr.intent == INTENT_IN)
2200 gfc_error ("Internal file '%s' at %L is INTENT(IN)",
2201 dt->io_unit->symtree->n.sym->name, &dt->io_unit->where);
2206 expr = dt->format_expr;
2208 if (expr != NULL && expr->expr_type == EXPR_CONSTANT)
2209 check_format_string (expr);
2212 && (k == M_READ || k == M_WRITE)
2213 && dt->io_unit->ts.type != BT_CHARACTER)
2216 ("io-unit in %s statement at %C must be an internal file in a "
2217 "PURE procedure", io_kind_name (k));
2222 new_st.op = (k == M_READ) ? EXEC_READ : EXEC_WRITE;
2224 new_st.next = io_code;
2226 terminate_io (io_code);
2231 gfc_error ("Syntax error in %s statement at %C", io_kind_name (k));
2241 gfc_match_read (void)
2243 return match_io (M_READ);
2247 gfc_match_write (void)
2249 return match_io (M_WRITE);
2253 gfc_match_print (void)
2257 m = match_io (M_PRINT);
2261 if (gfc_pure (NULL))
2263 gfc_error ("PRINT statement at %C not allowed within PURE procedure");
2271 /* Free a gfc_inquire structure. */
2274 gfc_free_inquire (gfc_inquire * inquire)
2277 if (inquire == NULL)
2280 gfc_free_expr (inquire->unit);
2281 gfc_free_expr (inquire->file);
2282 gfc_free_expr (inquire->iostat);
2283 gfc_free_expr (inquire->exist);
2284 gfc_free_expr (inquire->opened);
2285 gfc_free_expr (inquire->number);
2286 gfc_free_expr (inquire->named);
2287 gfc_free_expr (inquire->name);
2288 gfc_free_expr (inquire->access);
2289 gfc_free_expr (inquire->sequential);
2290 gfc_free_expr (inquire->direct);
2291 gfc_free_expr (inquire->form);
2292 gfc_free_expr (inquire->formatted);
2293 gfc_free_expr (inquire->unformatted);
2294 gfc_free_expr (inquire->recl);
2295 gfc_free_expr (inquire->nextrec);
2296 gfc_free_expr (inquire->blank);
2297 gfc_free_expr (inquire->position);
2298 gfc_free_expr (inquire->action);
2299 gfc_free_expr (inquire->read);
2300 gfc_free_expr (inquire->write);
2301 gfc_free_expr (inquire->readwrite);
2302 gfc_free_expr (inquire->delim);
2303 gfc_free_expr (inquire->pad);
2304 gfc_free_expr (inquire->iolength);
2310 /* Match an element of an INQUIRE statement. */
2312 #define RETM if (m != MATCH_NO) return m;
2315 match_inquire_element (gfc_inquire * inquire)
2319 m = match_etag (&tag_unit, &inquire->unit);
2320 RETM m = match_etag (&tag_file, &inquire->file);
2321 RETM m = match_ltag (&tag_err, &inquire->err);
2322 RETM m = match_out_tag (&tag_iostat, &inquire->iostat);
2323 RETM m = match_vtag (&tag_exist, &inquire->exist);
2324 RETM m = match_vtag (&tag_opened, &inquire->opened);
2325 RETM m = match_vtag (&tag_named, &inquire->named);
2326 RETM m = match_vtag (&tag_name, &inquire->name);
2327 RETM m = match_out_tag (&tag_number, &inquire->number);
2328 RETM m = match_vtag (&tag_s_access, &inquire->access);
2329 RETM m = match_vtag (&tag_sequential, &inquire->sequential);
2330 RETM m = match_vtag (&tag_direct, &inquire->direct);
2331 RETM m = match_vtag (&tag_s_form, &inquire->form);
2332 RETM m = match_vtag (&tag_formatted, &inquire->formatted);
2333 RETM m = match_vtag (&tag_unformatted, &inquire->unformatted);
2334 RETM m = match_out_tag (&tag_s_recl, &inquire->recl);
2335 RETM m = match_out_tag (&tag_nextrec, &inquire->nextrec);
2336 RETM m = match_vtag (&tag_s_blank, &inquire->blank);
2337 RETM m = match_vtag (&tag_s_position, &inquire->position);
2338 RETM m = match_vtag (&tag_s_action, &inquire->action);
2339 RETM m = match_vtag (&tag_read, &inquire->read);
2340 RETM m = match_vtag (&tag_write, &inquire->write);
2341 RETM m = match_vtag (&tag_readwrite, &inquire->readwrite);
2342 RETM m = match_vtag (&tag_s_delim, &inquire->delim);
2343 RETM m = match_vtag (&tag_s_pad, &inquire->pad);
2344 RETM m = match_vtag (&tag_iolength, &inquire->iolength);
2345 RETM return MATCH_NO;
2352 gfc_match_inquire (void)
2354 gfc_inquire *inquire;
2358 m = gfc_match_char ('(');
2362 inquire = gfc_getmem (sizeof (gfc_inquire));
2364 m = match_inquire_element (inquire);
2365 if (m == MATCH_ERROR)
2369 m = gfc_match_expr (&inquire->unit);
2370 if (m == MATCH_ERROR)
2376 /* See if we have the IOLENGTH form of the inquire statement. */
2377 if (inquire->iolength != NULL)
2379 if (gfc_match_char (')') != MATCH_YES)
2382 m = match_io_list (M_INQUIRE, &code);
2383 if (m == MATCH_ERROR)
2388 terminate_io (code);
2390 new_st.op = EXEC_IOLENGTH;
2391 new_st.expr = inquire->iolength;
2392 new_st.ext.inquire = inquire;
2394 if (gfc_pure (NULL))
2396 gfc_free_statements (code);
2397 gfc_error ("INQUIRE statement not allowed in PURE procedure at %C");
2405 /* At this point, we have the non-IOLENGTH inquire statement. */
2408 if (gfc_match_char (')') == MATCH_YES)
2410 if (gfc_match_char (',') != MATCH_YES)
2413 m = match_inquire_element (inquire);
2414 if (m == MATCH_ERROR)
2419 if (inquire->iolength != NULL)
2421 gfc_error ("IOLENGTH tag invalid in INQUIRE statement at %C");
2426 if (gfc_match_eos () != MATCH_YES)
2429 if (gfc_pure (NULL))
2431 gfc_error ("INQUIRE statement not allowed in PURE procedure at %C");
2435 new_st.op = EXEC_INQUIRE;
2436 new_st.ext.inquire = inquire;
2440 gfc_syntax_error (ST_INQUIRE);
2443 gfc_free_inquire (inquire);
2448 /* Resolve everything in a gfc_inquire structure. */
2451 gfc_resolve_inquire (gfc_inquire * inquire)
2454 RESOLVE_TAG (&tag_unit, inquire->unit);
2455 RESOLVE_TAG (&tag_file, inquire->file);
2456 RESOLVE_TAG (&tag_iostat, inquire->iostat);
2457 RESOLVE_TAG (&tag_exist, inquire->exist);
2458 RESOLVE_TAG (&tag_opened, inquire->opened);
2459 RESOLVE_TAG (&tag_number, inquire->number);
2460 RESOLVE_TAG (&tag_named, inquire->named);
2461 RESOLVE_TAG (&tag_name, inquire->name);
2462 RESOLVE_TAG (&tag_s_access, inquire->access);
2463 RESOLVE_TAG (&tag_sequential, inquire->sequential);
2464 RESOLVE_TAG (&tag_direct, inquire->direct);
2465 RESOLVE_TAG (&tag_s_form, inquire->form);
2466 RESOLVE_TAG (&tag_formatted, inquire->formatted);
2467 RESOLVE_TAG (&tag_unformatted, inquire->unformatted);
2468 RESOLVE_TAG (&tag_s_recl, inquire->recl);
2469 RESOLVE_TAG (&tag_nextrec, inquire->nextrec);
2470 RESOLVE_TAG (&tag_s_blank, inquire->blank);
2471 RESOLVE_TAG (&tag_s_position, inquire->position);
2472 RESOLVE_TAG (&tag_s_action, inquire->action);
2473 RESOLVE_TAG (&tag_read, inquire->read);
2474 RESOLVE_TAG (&tag_write, inquire->write);
2475 RESOLVE_TAG (&tag_readwrite, inquire->readwrite);
2476 RESOLVE_TAG (&tag_s_delim, inquire->delim);
2477 RESOLVE_TAG (&tag_s_pad, inquire->pad);
2478 RESOLVE_TAG (&tag_iolength, inquire->iolength);
2480 if (gfc_reference_st_label (inquire->err, ST_LABEL_TARGET) == FAILURE)