1 /* Deal with I/O statements & related stuff.
2 Copyright (C) 2000, 2001, 2002, 2003, 2004, 2005 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
30 gfc_st_label format_asterisk =
31 { -1, ST_LABEL_FORMAT, ST_LABEL_FORMAT, NULL, 0,
32 {NULL, NULL}, NULL, NULL};
36 const char *name, *spec;
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};
84 static gfc_dt *current_dt;
86 #define RESOLVE_TAG(x, y) if (resolve_tag(x, y) == FAILURE) return FAILURE;
89 /**************** Fortran 95 FORMAT parser *****************/
91 /* FORMAT tokens returned by format_lex(). */
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
101 /* Local variables for checking format strings. The saved_token is
102 used to back up by a single format token during the parsing
104 static char *format_string;
105 static int format_length, use_last_char;
107 static format_token saved_token;
110 { MODE_STRING, MODE_FORMAT, MODE_COPY }
114 /* Return the next character in the format string. */
117 next_char (int in_string)
129 if (mode == MODE_STRING)
130 c = *format_string++;
133 c = gfc_next_char_literal (in_string);
137 if (mode == MODE_COPY)
138 *format_string++ = c;
146 /* Back up one character position. Only works once. */
155 static int value = 0;
157 /* Simple lexical analyzer for getting the next token in a FORMAT
168 if (saved_token != FMT_NONE)
171 saved_token = FMT_NONE;
179 while (gfc_is_whitespace (c));
200 value = 10 * value + c - '0';
209 token = FMT_SIGNED_INT;
232 value = 10 * value + c - '0';
237 token = zflag ? FMT_ZERO : FMT_POSINT;
262 if (c != 'L' && c != 'R')
282 if (c != 'P' && c != 'S')
290 if (c == 'N' || c == 'Z')
352 if (c == 'N' || c == 'S')
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. */
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";
416 saved_token = FMT_NONE;
424 error = "Missing leading left parenthesis";
430 goto finished; /* Empty format is legal */
434 /* In this state, the next thing has to be a format item. */
458 /* Signed integer can only precede a P format. */
462 error = "Expected P edit descriptor";
469 /* P requires a prior number. */
470 error = "P descriptor requires leading scale factor";
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")
486 goto extension_optional_comma;
495 if (gfc_notify_std (GFC_STD_GNU, "Extension: $ descriptor at %C")
498 if (t != FMT_RPAREN || level > 0)
500 error = "$ must be the last specifier";
521 error = unexpected_end;
525 error = unexpected_element;
530 /* In this state, t must currently be a data descriptor.
531 Deal with things that can/must follow the descriptor. */
545 error = "Repeat count cannot follow P descriptor";
560 error = posint_required;
576 error = posint_required;
583 error = period_required;
588 if (u != FMT_ZERO && u != FMT_POSINT)
590 error = nonneg_required;
597 /* Look for optional exponent. */
608 error = "Positive exponent width required";
617 if (t != FMT_ZERO && t != FMT_POSINT)
619 error = nonneg_required;
626 error = period_required;
631 if (t != FMT_ZERO && t != FMT_POSINT)
633 error = nonneg_required;
640 if(mode == MODE_STRING)
642 format_string += value;
643 format_length -= value;
657 if (t != FMT_ZERO && t != FMT_POSINT)
659 error = nonneg_required;
671 if (t != FMT_ZERO && t != FMT_POSINT)
673 error = nonneg_required;
681 error = unexpected_element;
686 /* Between a descriptor and what comes next. */
705 error = unexpected_end;
709 if (gfc_notify_std (GFC_STD_GNU, "Extension: Missing comma at %C")
716 /* Optional comma is a weird between state where we've just finished
717 reading a colon, slash or P descriptor. */
731 /* Assume that we have another format item. */
738 extension_optional_comma:
739 /* As a GNU extension, permit a missing comma after a string literal. */
757 error = unexpected_end;
761 if (gfc_notify_std (GFC_STD_GNU, "Extension: Missing comma at %C")
771 /* Something went wrong. If the format we're checking is a string,
772 generate a warning, since the program is correct. If the format
773 is in a FORMAT statement, this messes up parsing, which is an
775 if (mode != MODE_STRING)
776 gfc_error ("%s in format string at %C", error);
779 gfc_warning ("%s in format string at %C", error);
781 /* TODO: More elaborate measures are needed to show where a problem
782 is within a format string that has been calculated. */
792 /* Given an expression node that is a constant string, see if it looks
793 like a format string. */
796 check_format_string (gfc_expr * e)
800 format_string = e->value.character.string;
805 /************ Fortran 95 I/O statement matchers *************/
807 /* Match a FORMAT statement. This amounts to actually parsing the
808 format descriptors in order to correctly locate the end of the
812 gfc_match_format (void)
817 if (gfc_statement_label == NULL)
819 gfc_error ("Missing format label at %C");
822 gfc_gobble_whitespace ();
827 start = gfc_current_locus;
829 if (check_format () == FAILURE)
832 if (gfc_match_eos () != MATCH_YES)
834 gfc_syntax_error (ST_FORMAT);
838 /* The label doesn't get created until after the statement is done
839 being matched, so we have to leave the string for later. */
841 gfc_current_locus = start; /* Back to the beginning */
844 new_st.op = EXEC_NOP;
847 e->expr_type = EXPR_CONSTANT;
848 e->ts.type = BT_CHARACTER;
849 e->ts.kind = gfc_default_character_kind;
851 e->value.character.string = format_string = gfc_getmem(format_length+1);
852 e->value.character.length = format_length;
853 gfc_statement_label->format = e;
856 check_format (); /* Guaranteed to succeed */
857 gfc_match_eos (); /* Guaranteed to succeed */
863 /* Match an expression I/O tag of some sort. */
866 match_etag (const io_tag * tag, gfc_expr ** v)
871 m = gfc_match (tag->spec, &result);
877 gfc_error ("Duplicate %s specification at %C", tag->name);
878 gfc_free_expr (result);
887 /* Match a variable I/O tag of some sort. */
890 match_vtag (const io_tag * tag, gfc_expr ** v)
895 m = gfc_match (tag->spec, &result);
901 gfc_error ("Duplicate %s specification at %C", tag->name);
902 gfc_free_expr (result);
906 if (result->symtree->n.sym->attr.intent == INTENT_IN)
908 gfc_error ("Variable tag cannot be INTENT(IN) at %C");
909 gfc_free_expr (result);
913 if (gfc_pure (NULL) && gfc_impure_variable (result->symtree->n.sym))
915 gfc_error ("Variable tag cannot be assigned in PURE procedure at %C");
916 gfc_free_expr (result);
925 /* Match I/O tags that cause variables to become redefined. */
928 match_out_tag(const io_tag *tag, gfc_expr **result)
932 m = match_vtag(tag, result);
934 gfc_check_do_variable((*result)->symtree);
940 /* Match a label I/O tag. */
943 match_ltag (const io_tag * tag, gfc_st_label ** label)
949 m = gfc_match (tag->spec, label);
950 if (m == MATCH_YES && old != 0)
952 gfc_error ("Duplicate %s label specification at %C", tag->name);
960 /* Do expression resolution and type-checking on an expression tag. */
963 resolve_tag (const io_tag * tag, gfc_expr * e)
969 if (gfc_resolve_expr (e) == FAILURE)
972 if (e->ts.type != tag->type)
974 /* Format label can be integer varibale. */
975 if (tag != &tag_format || e->ts.type != BT_INTEGER)
977 gfc_error ("%s tag at %L must be of type %s or %s", tag->name,
978 &e->where, gfc_basic_typename (tag->type),
979 gfc_basic_typename (BT_INTEGER));
984 if (tag == &tag_format)
986 if (e->rank != 1 && e->rank != 0)
988 gfc_error ("FORMAT tag at %L cannot be array of strings",
992 /* Check assigned label. */
993 if (e->expr_type == EXPR_VARIABLE && e->ts.type == BT_INTEGER
994 && e->symtree->n.sym->attr.assign != 1)
996 gfc_error ("Variable '%s' has not been assigned a format label at %L",
997 e->symtree->n.sym->name, &e->where);
1005 gfc_error ("%s tag at %L must be scalar", tag->name, &e->where);
1014 /* Match a single tag of an OPEN statement. */
1017 match_open_element (gfc_open * open)
1021 m = match_etag (&tag_unit, &open->unit);
1024 m = match_out_tag (&tag_iostat, &open->iostat);
1027 m = match_etag (&tag_file, &open->file);
1030 m = match_etag (&tag_status, &open->status);
1033 m = match_etag (&tag_e_access, &open->access);
1036 m = match_etag (&tag_e_form, &open->form);
1039 m = match_etag (&tag_e_recl, &open->recl);
1042 m = match_etag (&tag_e_blank, &open->blank);
1045 m = match_etag (&tag_e_position, &open->position);
1048 m = match_etag (&tag_e_action, &open->action);
1051 m = match_etag (&tag_e_delim, &open->delim);
1054 m = match_etag (&tag_e_pad, &open->pad);
1057 m = match_ltag (&tag_err, &open->err);
1065 /* Free the gfc_open structure and all the expressions it contains. */
1068 gfc_free_open (gfc_open * open)
1074 gfc_free_expr (open->unit);
1075 gfc_free_expr (open->iostat);
1076 gfc_free_expr (open->file);
1077 gfc_free_expr (open->status);
1078 gfc_free_expr (open->access);
1079 gfc_free_expr (open->form);
1080 gfc_free_expr (open->recl);
1081 gfc_free_expr (open->blank);
1082 gfc_free_expr (open->position);
1083 gfc_free_expr (open->action);
1084 gfc_free_expr (open->delim);
1085 gfc_free_expr (open->pad);
1091 /* Resolve everything in a gfc_open structure. */
1094 gfc_resolve_open (gfc_open * open)
1097 RESOLVE_TAG (&tag_unit, open->unit);
1098 RESOLVE_TAG (&tag_iostat, open->iostat);
1099 RESOLVE_TAG (&tag_file, open->file);
1100 RESOLVE_TAG (&tag_status, open->status);
1101 RESOLVE_TAG (&tag_e_form, open->form);
1102 RESOLVE_TAG (&tag_e_recl, open->recl);
1104 RESOLVE_TAG (&tag_e_blank, open->blank);
1105 RESOLVE_TAG (&tag_e_position, open->position);
1106 RESOLVE_TAG (&tag_e_action, open->action);
1107 RESOLVE_TAG (&tag_e_delim, open->delim);
1108 RESOLVE_TAG (&tag_e_pad, open->pad);
1110 if (gfc_reference_st_label (open->err, ST_LABEL_TARGET) == FAILURE)
1117 /* Match an OPEN statement. */
1120 gfc_match_open (void)
1125 m = gfc_match_char ('(');
1129 open = gfc_getmem (sizeof (gfc_open));
1131 m = match_open_element (open);
1133 if (m == MATCH_ERROR)
1137 m = gfc_match_expr (&open->unit);
1140 if (m == MATCH_ERROR)
1146 if (gfc_match_char (')') == MATCH_YES)
1148 if (gfc_match_char (',') != MATCH_YES)
1151 m = match_open_element (open);
1152 if (m == MATCH_ERROR)
1158 if (gfc_match_eos () == MATCH_NO)
1161 if (gfc_pure (NULL))
1163 gfc_error ("OPEN statement not allowed in PURE procedure at %C");
1167 new_st.op = EXEC_OPEN;
1168 new_st.ext.open = open;
1172 gfc_syntax_error (ST_OPEN);
1175 gfc_free_open (open);
1180 /* Free a gfc_close structure an all its expressions. */
1183 gfc_free_close (gfc_close * close)
1189 gfc_free_expr (close->unit);
1190 gfc_free_expr (close->iostat);
1191 gfc_free_expr (close->status);
1197 /* Match elements of a CLOSE statement. */
1200 match_close_element (gfc_close * close)
1204 m = match_etag (&tag_unit, &close->unit);
1207 m = match_etag (&tag_status, &close->status);
1210 m = match_out_tag (&tag_iostat, &close->iostat);
1213 m = match_ltag (&tag_err, &close->err);
1221 /* Match a CLOSE statement. */
1224 gfc_match_close (void)
1229 m = gfc_match_char ('(');
1233 close = gfc_getmem (sizeof (gfc_close));
1235 m = match_close_element (close);
1237 if (m == MATCH_ERROR)
1241 m = gfc_match_expr (&close->unit);
1244 if (m == MATCH_ERROR)
1250 if (gfc_match_char (')') == MATCH_YES)
1252 if (gfc_match_char (',') != MATCH_YES)
1255 m = match_close_element (close);
1256 if (m == MATCH_ERROR)
1262 if (gfc_match_eos () == MATCH_NO)
1265 if (gfc_pure (NULL))
1267 gfc_error ("CLOSE statement not allowed in PURE procedure at %C");
1271 new_st.op = EXEC_CLOSE;
1272 new_st.ext.close = close;
1276 gfc_syntax_error (ST_CLOSE);
1279 gfc_free_close (close);
1284 /* Resolve everything in a gfc_close structure. */
1287 gfc_resolve_close (gfc_close * close)
1290 RESOLVE_TAG (&tag_unit, close->unit);
1291 RESOLVE_TAG (&tag_iostat, close->iostat);
1292 RESOLVE_TAG (&tag_status, close->status);
1294 if (gfc_reference_st_label (close->err, ST_LABEL_TARGET) == FAILURE)
1301 /* Free a gfc_filepos structure. */
1304 gfc_free_filepos (gfc_filepos * fp)
1307 gfc_free_expr (fp->unit);
1308 gfc_free_expr (fp->iostat);
1313 /* Match elements of a REWIND, BACKSPACE or ENDFILE statement. */
1316 match_file_element (gfc_filepos * fp)
1320 m = match_etag (&tag_unit, &fp->unit);
1323 m = match_out_tag (&tag_iostat, &fp->iostat);
1326 m = match_ltag (&tag_err, &fp->err);
1334 /* Match the second half of the file-positioning statements, REWIND,
1335 BACKSPACE or ENDFILE. */
1338 match_filepos (gfc_statement st, gfc_exec_op op)
1343 fp = gfc_getmem (sizeof (gfc_filepos));
1345 if (gfc_match_char ('(') == MATCH_NO)
1347 m = gfc_match_expr (&fp->unit);
1348 if (m == MATCH_ERROR)
1356 m = match_file_element (fp);
1357 if (m == MATCH_ERROR)
1361 m = gfc_match_expr (&fp->unit);
1362 if (m == MATCH_ERROR)
1370 if (gfc_match_char (')') == MATCH_YES)
1372 if (gfc_match_char (',') != MATCH_YES)
1375 m = match_file_element (fp);
1376 if (m == MATCH_ERROR)
1383 if (gfc_match_eos () != MATCH_YES)
1386 if (gfc_pure (NULL))
1388 gfc_error ("%s statement not allowed in PURE procedure at %C",
1389 gfc_ascii_statement (st));
1395 new_st.ext.filepos = fp;
1399 gfc_syntax_error (st);
1402 gfc_free_filepos (fp);
1408 gfc_resolve_filepos (gfc_filepos * fp)
1411 RESOLVE_TAG (&tag_unit, fp->unit);
1412 if (gfc_reference_st_label (fp->err, ST_LABEL_TARGET) == FAILURE)
1419 /* Match the file positioning statements: ENDFILE, BACKSPACE or
1423 gfc_match_endfile (void)
1426 return match_filepos (ST_END_FILE, EXEC_ENDFILE);
1430 gfc_match_backspace (void)
1433 return match_filepos (ST_BACKSPACE, EXEC_BACKSPACE);
1437 gfc_match_rewind (void)
1440 return match_filepos (ST_REWIND, EXEC_REWIND);
1444 /******************** Data Transfer Statements *********************/
1447 { M_READ, M_WRITE, M_PRINT, M_INQUIRE }
1451 /* Return a default unit number. */
1454 default_unit (io_kind k)
1463 return gfc_int_expr (unit);
1467 /* Match a unit specification for a data transfer statement. */
1470 match_dt_unit (io_kind k, gfc_dt * dt)
1474 if (gfc_match_char ('*') == MATCH_YES)
1476 if (dt->io_unit != NULL)
1479 dt->io_unit = default_unit (k);
1483 if (gfc_match_expr (&e) == MATCH_YES)
1485 if (dt->io_unit != NULL)
1498 gfc_error ("Duplicate UNIT specification at %C");
1503 /* Match a format specification. */
1506 match_dt_format (gfc_dt * dt)
1510 gfc_st_label *label;
1512 where = gfc_current_locus;
1514 if (gfc_match_char ('*') == MATCH_YES)
1516 if (dt->format_expr != NULL || dt->format_label != NULL)
1519 dt->format_label = &format_asterisk;
1523 if (gfc_match_st_label (&label, 0) == MATCH_YES)
1525 if (dt->format_expr != NULL || dt->format_label != NULL)
1527 gfc_free_st_label (label);
1531 if (gfc_reference_st_label (label, ST_LABEL_FORMAT) == FAILURE)
1534 dt->format_label = label;
1538 if (gfc_match_expr (&e) == MATCH_YES)
1540 if (dt->format_expr != NULL || dt->format_label != NULL)
1545 dt->format_expr = e;
1549 gfc_current_locus = where; /* The only case where we have to restore */
1554 gfc_error ("Duplicate format specification at %C");
1559 /* Traverse a namelist that is part of a READ statement to make sure
1560 that none of the variables in the namelist are INTENT(IN). Returns
1561 nonzero if we find such a variable. */
1564 check_namelist (gfc_symbol * sym)
1568 for (p = sym->namelist; p; p = p->next)
1569 if (p->sym->attr.intent == INTENT_IN)
1571 gfc_error ("Symbol '%s' in namelist '%s' is INTENT(IN) at %C",
1572 p->sym->name, sym->name);
1580 /* Match a single data transfer element. */
1583 match_dt_element (io_kind k, gfc_dt * dt)
1585 char name[GFC_MAX_SYMBOL_LEN + 1];
1589 if (gfc_match (" unit =") == MATCH_YES)
1591 m = match_dt_unit (k, dt);
1596 if (gfc_match (" fmt =") == MATCH_YES)
1598 m = match_dt_format (dt);
1603 if (gfc_match (" nml = %n", name) == MATCH_YES)
1605 if (dt->namelist != NULL)
1607 gfc_error ("Duplicate NML specification at %C");
1611 if (gfc_find_symbol (name, NULL, 1, &sym))
1614 if (sym == NULL || sym->attr.flavor != FL_NAMELIST)
1616 gfc_error ("Symbol '%s' at %C must be a NAMELIST group name",
1617 sym != NULL ? sym->name : name);
1622 if (k == M_READ && check_namelist (sym))
1628 m = match_etag (&tag_rec, &dt->rec);
1631 m = match_out_tag (&tag_iostat, &dt->iostat);
1634 m = match_ltag (&tag_err, &dt->err);
1637 m = match_etag (&tag_advance, &dt->advance);
1640 m = match_out_tag (&tag_size, &dt->size);
1644 m = match_ltag (&tag_end, &dt->end);
1646 dt->end_where = gfc_current_locus;
1650 m = match_ltag (&tag_eor, &dt->eor);
1652 dt->eor_where = gfc_current_locus;
1660 /* Free a data transfer structure and everything below it. */
1663 gfc_free_dt (gfc_dt * dt)
1669 gfc_free_expr (dt->io_unit);
1670 gfc_free_expr (dt->format_expr);
1671 gfc_free_expr (dt->rec);
1672 gfc_free_expr (dt->advance);
1673 gfc_free_expr (dt->iostat);
1674 gfc_free_expr (dt->size);
1680 /* Resolve everything in a gfc_dt structure. */
1683 gfc_resolve_dt (gfc_dt * dt)
1687 RESOLVE_TAG (&tag_format, dt->format_expr);
1688 RESOLVE_TAG (&tag_rec, dt->rec);
1689 RESOLVE_TAG (&tag_advance, dt->advance);
1690 RESOLVE_TAG (&tag_iostat, dt->iostat);
1691 RESOLVE_TAG (&tag_size, dt->size);
1694 if (gfc_resolve_expr (e) == SUCCESS
1695 && (e->ts.type != BT_INTEGER
1696 && (e->ts.type != BT_CHARACTER
1697 || e->expr_type != EXPR_VARIABLE)))
1700 ("UNIT specification at %L must be an INTEGER expression or a "
1701 "CHARACTER variable", &e->where);
1705 /* Sanity checks on data transfer statements. */
1706 if (e->ts.type == BT_CHARACTER)
1708 if (dt->rec != NULL)
1710 gfc_error ("REC tag at %L is incompatible with internal file",
1715 if (dt->namelist != NULL)
1717 gfc_error ("Internal file at %L is incompatible with namelist",
1718 &dt->io_unit->where);
1722 if (dt->advance != NULL)
1724 gfc_error ("ADVANCE tag at %L is incompatible with internal file",
1725 &dt->advance->where);
1730 if (dt->rec != NULL)
1732 if (dt->end != NULL)
1734 gfc_error ("REC tag at %L is incompatible with END tag",
1739 if (dt->format_label == &format_asterisk)
1742 ("END tag at %L is incompatible with list directed format (*)",
1747 if (dt->namelist != NULL)
1749 gfc_error ("REC tag at %L is incompatible with namelist",
1755 if (dt->advance != NULL && dt->format_label == &format_asterisk)
1757 gfc_error ("ADVANCE tag at %L is incompatible with list directed "
1758 "format (*)", &dt->advance->where);
1762 if (dt->eor != 0 && dt->advance == NULL)
1764 gfc_error ("EOR tag at %L requires an ADVANCE tag", &dt->eor_where);
1768 if (dt->size != NULL && dt->advance == NULL)
1770 gfc_error ("SIZE tag at %L requires an ADVANCE tag", &dt->size->where);
1774 /* TODO: Make sure the ADVANCE tag is 'yes' or 'no' if it is a string
1777 if (gfc_reference_st_label (dt->err, ST_LABEL_TARGET) == FAILURE)
1780 if (gfc_reference_st_label (dt->end, ST_LABEL_TARGET) == FAILURE)
1783 if (gfc_reference_st_label (dt->eor, ST_LABEL_TARGET) == FAILURE)
1786 /* Check the format label actually exists. */
1787 if (dt->format_label && dt->format_label != &format_asterisk
1788 && dt->format_label->defined == ST_LABEL_UNKNOWN)
1790 gfc_error ("FORMAT label %d at %L not defined", dt->format_label->value,
1791 &dt->format_label->where);
1798 /* Given an io_kind, return its name. */
1801 io_kind_name (io_kind k)
1820 gfc_internal_error ("io_kind_name(): bad I/O-kind");
1827 /* Match an IO iteration statement of the form:
1829 ( [<IO element> ,] <IO element>, I = <expr>, <expr> [, <expr> ] )
1831 which is equivalent to a single IO element. This function is
1832 mutually recursive with match_io_element(). */
1834 static match match_io_element (io_kind k, gfc_code **);
1837 match_io_iterator (io_kind k, gfc_code ** result)
1839 gfc_code *head, *tail, *new;
1847 old_loc = gfc_current_locus;
1849 if (gfc_match_char ('(') != MATCH_YES)
1852 m = match_io_element (k, &head);
1855 if (m != MATCH_YES || gfc_match_char (',') != MATCH_YES)
1861 /* Can't be anything but an IO iterator. Build a list. */
1862 iter = gfc_get_iterator ();
1866 m = gfc_match_iterator (iter, 0);
1867 if (m == MATCH_ERROR)
1871 gfc_check_do_variable (iter->var->symtree);
1875 m = match_io_element (k, &new);
1876 if (m == MATCH_ERROR)
1885 tail = gfc_append_code (tail, new);
1887 if (gfc_match_char (',') != MATCH_YES)
1896 if (gfc_match_char (')') != MATCH_YES)
1899 new = gfc_get_code ();
1901 new->ext.iterator = iter;
1903 new->block = gfc_get_code ();
1904 new->block->op = EXEC_DO;
1905 new->block->next = head;
1911 gfc_error ("Syntax error in I/O iterator at %C");
1915 gfc_free_iterator (iter, 1);
1916 gfc_free_statements (head);
1917 gfc_current_locus = old_loc;
1922 /* Match a single element of an IO list, which is either a single
1923 expression or an IO Iterator. */
1926 match_io_element (io_kind k, gfc_code ** cpp)
1934 m = match_io_iterator (k, cpp);
1940 m = gfc_match_variable (&expr, 0);
1942 gfc_error ("Expected variable in READ statement at %C");
1946 m = gfc_match_expr (&expr);
1948 gfc_error ("Expected expression in %s statement at %C",
1956 if (expr->symtree->n.sym->attr.intent == INTENT_IN)
1959 ("Variable '%s' in input list at %C cannot be INTENT(IN)",
1960 expr->symtree->n.sym->name);
1965 && gfc_impure_variable (expr->symtree->n.sym)
1966 && current_dt->io_unit->ts.type == BT_CHARACTER)
1968 gfc_error ("Cannot read to variable '%s' in PURE procedure at %C",
1969 expr->symtree->n.sym->name);
1973 if (gfc_check_do_variable (expr->symtree))
1979 if (current_dt->io_unit->ts.type == BT_CHARACTER
1981 && current_dt->io_unit->expr_type == EXPR_VARIABLE
1982 && gfc_impure_variable (current_dt->io_unit->symtree->n.sym))
1985 ("Cannot write to internal file unit '%s' at %C inside a "
1986 "PURE procedure", current_dt->io_unit->symtree->n.sym->name);
1998 gfc_free_expr (expr);
2002 cp = gfc_get_code ();
2003 cp->op = EXEC_TRANSFER;
2011 /* Match an I/O list, building gfc_code structures as we go. */
2014 match_io_list (io_kind k, gfc_code ** head_p)
2016 gfc_code *head, *tail, *new;
2019 *head_p = head = tail = NULL;
2020 if (gfc_match_eos () == MATCH_YES)
2025 m = match_io_element (k, &new);
2026 if (m == MATCH_ERROR)
2031 tail = gfc_append_code (tail, new);
2035 if (gfc_match_eos () == MATCH_YES)
2037 if (gfc_match_char (',') != MATCH_YES)
2045 gfc_error ("Syntax error in %s statement at %C", io_kind_name (k));
2048 gfc_free_statements (head);
2053 /* Attach the data transfer end node. */
2056 terminate_io (gfc_code * io_code)
2060 if (io_code == NULL)
2063 c = gfc_get_code ();
2064 c->op = EXEC_DT_END;
2066 /* Point to structure that is already there */
2067 c->ext.dt = new_st.ext.dt;
2068 gfc_append_code (io_code, c);
2072 /* Match a READ, WRITE or PRINT statement. */
2075 match_io (io_kind k)
2077 char name[GFC_MAX_SYMBOL_LEN + 1];
2087 current_dt = dt = gfc_getmem (sizeof (gfc_dt));
2089 if (gfc_match_char ('(') == MATCH_NO)
2094 if (gfc_current_form == FORM_FREE)
2096 c = gfc_peek_char();
2097 if (c != ' ' && c != '*' && c != '\'' && c != '"')
2104 m = match_dt_format (dt);
2105 if (m == MATCH_ERROR)
2111 dt->io_unit = default_unit (k);
2115 /* Match a control list */
2116 if (match_dt_element (k, dt) == MATCH_YES)
2118 if (match_dt_unit (k, dt) != MATCH_YES)
2121 if (gfc_match_char (')') == MATCH_YES)
2123 if (gfc_match_char (',') != MATCH_YES)
2126 m = match_dt_element (k, dt);
2129 if (m == MATCH_ERROR)
2132 m = match_dt_format (dt);
2135 if (m == MATCH_ERROR)
2138 where = gfc_current_locus;
2140 if (gfc_match_name (name) == MATCH_YES
2141 && !gfc_find_symbol (name, NULL, 1, &sym)
2142 && sym->attr.flavor == FL_NAMELIST)
2145 if (k == M_READ && check_namelist (sym))
2153 gfc_current_locus = where;
2155 goto loop; /* No matches, try regular elements */
2158 if (gfc_match_char (')') == MATCH_YES)
2160 if (gfc_match_char (',') != MATCH_YES)
2166 m = match_dt_element (k, dt);
2169 if (m == MATCH_ERROR)
2172 if (gfc_match_char (')') == MATCH_YES)
2174 if (gfc_match_char (',') != MATCH_YES)
2179 /* Optional leading comma (non-standard). */
2181 && gfc_match_char (',') == MATCH_YES
2183 && gfc_notify_std (GFC_STD_GNU, "Extension: Comma before output "
2184 "item list at %C is an extension") == FAILURE)
2188 if (gfc_match_eos () != MATCH_YES)
2190 if (comma_flag && gfc_match_char (',') != MATCH_YES)
2192 gfc_error ("Expected comma in I/O list at %C");
2197 m = match_io_list (k, &io_code);
2198 if (m == MATCH_ERROR)
2204 /* A full IO statement has been matched. */
2205 if (dt->io_unit->expr_type == EXPR_VARIABLE
2207 && dt->io_unit->ts.type == BT_CHARACTER
2208 && dt->io_unit->symtree->n.sym->attr.intent == INTENT_IN)
2210 gfc_error ("Internal file '%s' at %L is INTENT(IN)",
2211 dt->io_unit->symtree->n.sym->name, &dt->io_unit->where);
2216 expr = dt->format_expr;
2218 if (expr != NULL && expr->expr_type == EXPR_CONSTANT)
2219 check_format_string (expr);
2222 && (k == M_READ || k == M_WRITE)
2223 && dt->io_unit->ts.type != BT_CHARACTER)
2226 ("io-unit in %s statement at %C must be an internal file in a "
2227 "PURE procedure", io_kind_name (k));
2232 new_st.op = (k == M_READ) ? EXEC_READ : EXEC_WRITE;
2234 new_st.next = io_code;
2236 terminate_io (io_code);
2241 gfc_error ("Syntax error in %s statement at %C", io_kind_name (k));
2251 gfc_match_read (void)
2253 return match_io (M_READ);
2257 gfc_match_write (void)
2259 return match_io (M_WRITE);
2263 gfc_match_print (void)
2267 m = match_io (M_PRINT);
2271 if (gfc_pure (NULL))
2273 gfc_error ("PRINT statement at %C not allowed within PURE procedure");
2281 /* Free a gfc_inquire structure. */
2284 gfc_free_inquire (gfc_inquire * inquire)
2287 if (inquire == NULL)
2290 gfc_free_expr (inquire->unit);
2291 gfc_free_expr (inquire->file);
2292 gfc_free_expr (inquire->iostat);
2293 gfc_free_expr (inquire->exist);
2294 gfc_free_expr (inquire->opened);
2295 gfc_free_expr (inquire->number);
2296 gfc_free_expr (inquire->named);
2297 gfc_free_expr (inquire->name);
2298 gfc_free_expr (inquire->access);
2299 gfc_free_expr (inquire->sequential);
2300 gfc_free_expr (inquire->direct);
2301 gfc_free_expr (inquire->form);
2302 gfc_free_expr (inquire->formatted);
2303 gfc_free_expr (inquire->unformatted);
2304 gfc_free_expr (inquire->recl);
2305 gfc_free_expr (inquire->nextrec);
2306 gfc_free_expr (inquire->blank);
2307 gfc_free_expr (inquire->position);
2308 gfc_free_expr (inquire->action);
2309 gfc_free_expr (inquire->read);
2310 gfc_free_expr (inquire->write);
2311 gfc_free_expr (inquire->readwrite);
2312 gfc_free_expr (inquire->delim);
2313 gfc_free_expr (inquire->pad);
2314 gfc_free_expr (inquire->iolength);
2320 /* Match an element of an INQUIRE statement. */
2322 #define RETM if (m != MATCH_NO) return m;
2325 match_inquire_element (gfc_inquire * inquire)
2329 m = match_etag (&tag_unit, &inquire->unit);
2330 RETM m = match_etag (&tag_file, &inquire->file);
2331 RETM m = match_ltag (&tag_err, &inquire->err);
2332 RETM m = match_out_tag (&tag_iostat, &inquire->iostat);
2333 RETM m = match_vtag (&tag_exist, &inquire->exist);
2334 RETM m = match_vtag (&tag_opened, &inquire->opened);
2335 RETM m = match_vtag (&tag_named, &inquire->named);
2336 RETM m = match_vtag (&tag_name, &inquire->name);
2337 RETM m = match_out_tag (&tag_number, &inquire->number);
2338 RETM m = match_vtag (&tag_s_access, &inquire->access);
2339 RETM m = match_vtag (&tag_sequential, &inquire->sequential);
2340 RETM m = match_vtag (&tag_direct, &inquire->direct);
2341 RETM m = match_vtag (&tag_s_form, &inquire->form);
2342 RETM m = match_vtag (&tag_formatted, &inquire->formatted);
2343 RETM m = match_vtag (&tag_unformatted, &inquire->unformatted);
2344 RETM m = match_out_tag (&tag_s_recl, &inquire->recl);
2345 RETM m = match_out_tag (&tag_nextrec, &inquire->nextrec);
2346 RETM m = match_vtag (&tag_s_blank, &inquire->blank);
2347 RETM m = match_vtag (&tag_s_position, &inquire->position);
2348 RETM m = match_vtag (&tag_s_action, &inquire->action);
2349 RETM m = match_vtag (&tag_read, &inquire->read);
2350 RETM m = match_vtag (&tag_write, &inquire->write);
2351 RETM m = match_vtag (&tag_readwrite, &inquire->readwrite);
2352 RETM m = match_vtag (&tag_s_delim, &inquire->delim);
2353 RETM m = match_vtag (&tag_s_pad, &inquire->pad);
2354 RETM m = match_vtag (&tag_iolength, &inquire->iolength);
2355 RETM return MATCH_NO;
2362 gfc_match_inquire (void)
2364 gfc_inquire *inquire;
2369 m = gfc_match_char ('(');
2373 inquire = gfc_getmem (sizeof (gfc_inquire));
2375 loc = gfc_current_locus;
2377 m = match_inquire_element (inquire);
2378 if (m == MATCH_ERROR)
2382 m = gfc_match_expr (&inquire->unit);
2383 if (m == MATCH_ERROR)
2389 /* See if we have the IOLENGTH form of the inquire statement. */
2390 if (inquire->iolength != NULL)
2392 if (gfc_match_char (')') != MATCH_YES)
2395 m = match_io_list (M_INQUIRE, &code);
2396 if (m == MATCH_ERROR)
2401 terminate_io (code);
2403 new_st.op = EXEC_IOLENGTH;
2404 new_st.expr = inquire->iolength;
2405 new_st.ext.inquire = inquire;
2407 if (gfc_pure (NULL))
2409 gfc_free_statements (code);
2410 gfc_error ("INQUIRE statement not allowed in PURE procedure at %C");
2418 /* At this point, we have the non-IOLENGTH inquire statement. */
2421 if (gfc_match_char (')') == MATCH_YES)
2423 if (gfc_match_char (',') != MATCH_YES)
2426 m = match_inquire_element (inquire);
2427 if (m == MATCH_ERROR)
2432 if (inquire->iolength != NULL)
2434 gfc_error ("IOLENGTH tag invalid in INQUIRE statement at %C");
2439 if (gfc_match_eos () != MATCH_YES)
2442 if (inquire->unit != NULL && inquire->file != NULL)
2444 gfc_error ("INQUIRE statement at %L cannot contain both FILE and"
2445 " UNIT specifiers", &loc);
2449 if (inquire->unit == NULL && inquire->file == NULL)
2451 gfc_error ("INQUIRE statement at %L requires either FILE or"
2452 " UNIT specifier", &loc);
2456 if (gfc_pure (NULL))
2458 gfc_error ("INQUIRE statement not allowed in PURE procedure at %C");
2462 new_st.op = EXEC_INQUIRE;
2463 new_st.ext.inquire = inquire;
2467 gfc_syntax_error (ST_INQUIRE);
2470 gfc_free_inquire (inquire);
2475 /* Resolve everything in a gfc_inquire structure. */
2478 gfc_resolve_inquire (gfc_inquire * inquire)
2481 RESOLVE_TAG (&tag_unit, inquire->unit);
2482 RESOLVE_TAG (&tag_file, inquire->file);
2483 RESOLVE_TAG (&tag_iostat, inquire->iostat);
2484 RESOLVE_TAG (&tag_exist, inquire->exist);
2485 RESOLVE_TAG (&tag_opened, inquire->opened);
2486 RESOLVE_TAG (&tag_number, inquire->number);
2487 RESOLVE_TAG (&tag_named, inquire->named);
2488 RESOLVE_TAG (&tag_name, inquire->name);
2489 RESOLVE_TAG (&tag_s_access, inquire->access);
2490 RESOLVE_TAG (&tag_sequential, inquire->sequential);
2491 RESOLVE_TAG (&tag_direct, inquire->direct);
2492 RESOLVE_TAG (&tag_s_form, inquire->form);
2493 RESOLVE_TAG (&tag_formatted, inquire->formatted);
2494 RESOLVE_TAG (&tag_unformatted, inquire->unformatted);
2495 RESOLVE_TAG (&tag_s_recl, inquire->recl);
2496 RESOLVE_TAG (&tag_nextrec, inquire->nextrec);
2497 RESOLVE_TAG (&tag_s_blank, inquire->blank);
2498 RESOLVE_TAG (&tag_s_position, inquire->position);
2499 RESOLVE_TAG (&tag_s_action, inquire->action);
2500 RESOLVE_TAG (&tag_read, inquire->read);
2501 RESOLVE_TAG (&tag_write, inquire->write);
2502 RESOLVE_TAG (&tag_readwrite, inquire->readwrite);
2503 RESOLVE_TAG (&tag_s_delim, inquire->delim);
2504 RESOLVE_TAG (&tag_s_pad, inquire->pad);
2505 RESOLVE_TAG (&tag_iolength, inquire->iolength);
2507 if (gfc_reference_st_label (inquire->err, ST_LABEL_TARGET) == FAILURE)