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;
494 if (t != FMT_RPAREN || level > 0)
496 error = "$ must the last specifier";
517 error = unexpected_end;
521 error = unexpected_element;
526 /* In this state, t must currently be a data descriptor.
527 Deal with things that can/must follow the descriptor. */
541 error = "Repeat count cannot follow P descriptor";
556 error = posint_required;
572 error = posint_required;
579 error = period_required;
584 if (u != FMT_ZERO && u != FMT_POSINT)
586 error = nonneg_required;
593 /* Look for optional exponent. */
604 error = "Positive exponent width required";
613 if (t != FMT_ZERO && t != FMT_POSINT)
615 error = nonneg_required;
622 error = period_required;
627 if (t != FMT_ZERO && t != FMT_POSINT)
629 error = nonneg_required;
636 if(mode == MODE_STRING)
638 format_string += value;
639 format_length -= value;
653 if (t != FMT_ZERO && t != FMT_POSINT)
655 error = nonneg_required;
667 if (t != FMT_ZERO && t != FMT_POSINT)
669 error = nonneg_required;
677 error = unexpected_element;
682 /* Between a descriptor and what comes next. */
701 error = unexpected_end;
705 if (gfc_notify_std (GFC_STD_GNU, "Extension: Missing comma at %C")
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 || e->ts.type != BT_INTEGER)
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",
987 /* Check assigned label. */
988 if (e->expr_type == EXPR_VARIABLE && e->ts.type == BT_INTEGER
989 && e->symtree->n.sym->attr.assign != 1)
991 gfc_error ("Variable '%s' has not been assigned a format label at %L",
992 e->symtree->n.sym->name, &e->where);
1000 gfc_error ("%s tag at %L must be scalar", tag->name, &e->where);
1009 /* Match a single tag of an OPEN statement. */
1012 match_open_element (gfc_open * open)
1016 m = match_etag (&tag_unit, &open->unit);
1019 m = match_out_tag (&tag_iostat, &open->iostat);
1022 m = match_etag (&tag_file, &open->file);
1025 m = match_etag (&tag_status, &open->status);
1028 m = match_etag (&tag_e_access, &open->access);
1031 m = match_etag (&tag_e_form, &open->form);
1034 m = match_etag (&tag_e_recl, &open->recl);
1037 m = match_etag (&tag_e_blank, &open->blank);
1040 m = match_etag (&tag_e_position, &open->position);
1043 m = match_etag (&tag_e_action, &open->action);
1046 m = match_etag (&tag_e_delim, &open->delim);
1049 m = match_etag (&tag_e_pad, &open->pad);
1052 m = match_ltag (&tag_err, &open->err);
1060 /* Free the gfc_open structure and all the expressions it contains. */
1063 gfc_free_open (gfc_open * open)
1069 gfc_free_expr (open->unit);
1070 gfc_free_expr (open->iostat);
1071 gfc_free_expr (open->file);
1072 gfc_free_expr (open->status);
1073 gfc_free_expr (open->access);
1074 gfc_free_expr (open->form);
1075 gfc_free_expr (open->recl);
1076 gfc_free_expr (open->blank);
1077 gfc_free_expr (open->position);
1078 gfc_free_expr (open->action);
1079 gfc_free_expr (open->delim);
1080 gfc_free_expr (open->pad);
1086 /* Resolve everything in a gfc_open structure. */
1089 gfc_resolve_open (gfc_open * open)
1092 RESOLVE_TAG (&tag_unit, open->unit);
1093 RESOLVE_TAG (&tag_iostat, open->iostat);
1094 RESOLVE_TAG (&tag_file, open->file);
1095 RESOLVE_TAG (&tag_status, open->status);
1096 RESOLVE_TAG (&tag_e_form, open->form);
1097 RESOLVE_TAG (&tag_e_recl, open->recl);
1099 RESOLVE_TAG (&tag_e_blank, open->blank);
1100 RESOLVE_TAG (&tag_e_position, open->position);
1101 RESOLVE_TAG (&tag_e_action, open->action);
1102 RESOLVE_TAG (&tag_e_delim, open->delim);
1103 RESOLVE_TAG (&tag_e_pad, open->pad);
1105 if (gfc_reference_st_label (open->err, ST_LABEL_TARGET) == FAILURE)
1112 /* Match an OPEN statement. */
1115 gfc_match_open (void)
1120 m = gfc_match_char ('(');
1124 open = gfc_getmem (sizeof (gfc_open));
1126 m = match_open_element (open);
1128 if (m == MATCH_ERROR)
1132 m = gfc_match_expr (&open->unit);
1135 if (m == MATCH_ERROR)
1141 if (gfc_match_char (')') == MATCH_YES)
1143 if (gfc_match_char (',') != MATCH_YES)
1146 m = match_open_element (open);
1147 if (m == MATCH_ERROR)
1153 if (gfc_match_eos () == MATCH_NO)
1156 if (gfc_pure (NULL))
1158 gfc_error ("OPEN statement not allowed in PURE procedure at %C");
1162 new_st.op = EXEC_OPEN;
1163 new_st.ext.open = open;
1167 gfc_syntax_error (ST_OPEN);
1170 gfc_free_open (open);
1175 /* Free a gfc_close structure an all its expressions. */
1178 gfc_free_close (gfc_close * close)
1184 gfc_free_expr (close->unit);
1185 gfc_free_expr (close->iostat);
1186 gfc_free_expr (close->status);
1192 /* Match elements of a CLOSE statement. */
1195 match_close_element (gfc_close * close)
1199 m = match_etag (&tag_unit, &close->unit);
1202 m = match_etag (&tag_status, &close->status);
1205 m = match_out_tag (&tag_iostat, &close->iostat);
1208 m = match_ltag (&tag_err, &close->err);
1216 /* Match a CLOSE statement. */
1219 gfc_match_close (void)
1224 m = gfc_match_char ('(');
1228 close = gfc_getmem (sizeof (gfc_close));
1230 m = match_close_element (close);
1232 if (m == MATCH_ERROR)
1236 m = gfc_match_expr (&close->unit);
1239 if (m == MATCH_ERROR)
1245 if (gfc_match_char (')') == MATCH_YES)
1247 if (gfc_match_char (',') != MATCH_YES)
1250 m = match_close_element (close);
1251 if (m == MATCH_ERROR)
1257 if (gfc_match_eos () == MATCH_NO)
1260 if (gfc_pure (NULL))
1262 gfc_error ("CLOSE statement not allowed in PURE procedure at %C");
1266 new_st.op = EXEC_CLOSE;
1267 new_st.ext.close = close;
1271 gfc_syntax_error (ST_CLOSE);
1274 gfc_free_close (close);
1279 /* Resolve everything in a gfc_close structure. */
1282 gfc_resolve_close (gfc_close * close)
1285 RESOLVE_TAG (&tag_unit, close->unit);
1286 RESOLVE_TAG (&tag_iostat, close->iostat);
1287 RESOLVE_TAG (&tag_status, close->status);
1289 if (gfc_reference_st_label (close->err, ST_LABEL_TARGET) == FAILURE)
1296 /* Free a gfc_filepos structure. */
1299 gfc_free_filepos (gfc_filepos * fp)
1302 gfc_free_expr (fp->unit);
1303 gfc_free_expr (fp->iostat);
1308 /* Match elements of a REWIND, BACKSPACE or ENDFILE statement. */
1311 match_file_element (gfc_filepos * fp)
1315 m = match_etag (&tag_unit, &fp->unit);
1318 m = match_out_tag (&tag_iostat, &fp->iostat);
1321 m = match_ltag (&tag_err, &fp->err);
1329 /* Match the second half of the file-positioning statements, REWIND,
1330 BACKSPACE or ENDFILE. */
1333 match_filepos (gfc_statement st, gfc_exec_op op)
1338 fp = gfc_getmem (sizeof (gfc_filepos));
1340 if (gfc_match_char ('(') == MATCH_NO)
1342 m = gfc_match_expr (&fp->unit);
1343 if (m == MATCH_ERROR)
1351 m = match_file_element (fp);
1352 if (m == MATCH_ERROR)
1356 m = gfc_match_expr (&fp->unit);
1357 if (m == MATCH_ERROR)
1365 if (gfc_match_char (')') == MATCH_YES)
1367 if (gfc_match_char (',') != MATCH_YES)
1370 m = match_file_element (fp);
1371 if (m == MATCH_ERROR)
1378 if (gfc_match_eos () != MATCH_YES)
1381 if (gfc_pure (NULL))
1383 gfc_error ("%s statement not allowed in PURE procedure at %C",
1384 gfc_ascii_statement (st));
1390 new_st.ext.filepos = fp;
1394 gfc_syntax_error (st);
1397 gfc_free_filepos (fp);
1403 gfc_resolve_filepos (gfc_filepos * fp)
1406 RESOLVE_TAG (&tag_unit, fp->unit);
1407 if (gfc_reference_st_label (fp->err, ST_LABEL_TARGET) == FAILURE)
1414 /* Match the file positioning statements: ENDFILE, BACKSPACE or
1418 gfc_match_endfile (void)
1421 return match_filepos (ST_END_FILE, EXEC_ENDFILE);
1425 gfc_match_backspace (void)
1428 return match_filepos (ST_BACKSPACE, EXEC_BACKSPACE);
1432 gfc_match_rewind (void)
1435 return match_filepos (ST_REWIND, EXEC_REWIND);
1439 /******************** Data Transfer Statements *********************/
1442 { M_READ, M_WRITE, M_PRINT, M_INQUIRE }
1446 /* Return a default unit number. */
1449 default_unit (io_kind k)
1458 return gfc_int_expr (unit);
1462 /* Match a unit specification for a data transfer statement. */
1465 match_dt_unit (io_kind k, gfc_dt * dt)
1469 if (gfc_match_char ('*') == MATCH_YES)
1471 if (dt->io_unit != NULL)
1474 dt->io_unit = default_unit (k);
1478 if (gfc_match_expr (&e) == MATCH_YES)
1480 if (dt->io_unit != NULL)
1493 gfc_error ("Duplicate UNIT specification at %C");
1498 /* Match a format specification. */
1501 match_dt_format (gfc_dt * dt)
1505 gfc_st_label *label;
1507 where = gfc_current_locus;
1509 if (gfc_match_char ('*') == MATCH_YES)
1511 if (dt->format_expr != NULL || dt->format_label != NULL)
1514 dt->format_label = &format_asterisk;
1518 if (gfc_match_st_label (&label, 0) == MATCH_YES)
1520 if (dt->format_expr != NULL || dt->format_label != NULL)
1522 gfc_free_st_label (label);
1526 if (gfc_reference_st_label (label, ST_LABEL_FORMAT) == FAILURE)
1529 dt->format_label = label;
1533 if (gfc_match_expr (&e) == MATCH_YES)
1535 if (dt->format_expr != NULL || dt->format_label != NULL)
1540 dt->format_expr = e;
1544 gfc_current_locus = where; /* The only case where we have to restore */
1549 gfc_error ("Duplicate format specification at %C");
1554 /* Traverse a namelist that is part of a READ statement to make sure
1555 that none of the variables in the namelist are INTENT(IN). Returns
1556 nonzero if we find such a variable. */
1559 check_namelist (gfc_symbol * sym)
1563 for (p = sym->namelist; p; p = p->next)
1564 if (p->sym->attr.intent == INTENT_IN)
1566 gfc_error ("Symbol '%s' in namelist '%s' is INTENT(IN) at %C",
1567 p->sym->name, sym->name);
1575 /* Match a single data transfer element. */
1578 match_dt_element (io_kind k, gfc_dt * dt)
1580 char name[GFC_MAX_SYMBOL_LEN + 1];
1584 if (gfc_match (" unit =") == MATCH_YES)
1586 m = match_dt_unit (k, dt);
1591 if (gfc_match (" fmt =") == MATCH_YES)
1593 m = match_dt_format (dt);
1598 if (gfc_match (" nml = %n", name) == MATCH_YES)
1600 if (dt->namelist != NULL)
1602 gfc_error ("Duplicate NML specification at %C");
1606 if (gfc_find_symbol (name, NULL, 1, &sym))
1609 if (sym == NULL || sym->attr.flavor != FL_NAMELIST)
1611 gfc_error ("Symbol '%s' at %C must be a NAMELIST group name",
1612 sym != NULL ? sym->name : name);
1617 if (k == M_READ && check_namelist (sym))
1623 m = match_etag (&tag_rec, &dt->rec);
1626 m = match_out_tag (&tag_iostat, &dt->iostat);
1629 m = match_ltag (&tag_err, &dt->err);
1632 m = match_etag (&tag_advance, &dt->advance);
1635 m = match_out_tag (&tag_size, &dt->size);
1639 m = match_ltag (&tag_end, &dt->end);
1641 dt->end_where = gfc_current_locus;
1645 m = match_ltag (&tag_eor, &dt->eor);
1647 dt->eor_where = gfc_current_locus;
1655 /* Free a data transfer structure and everything below it. */
1658 gfc_free_dt (gfc_dt * dt)
1664 gfc_free_expr (dt->io_unit);
1665 gfc_free_expr (dt->format_expr);
1666 gfc_free_expr (dt->rec);
1667 gfc_free_expr (dt->advance);
1668 gfc_free_expr (dt->iostat);
1669 gfc_free_expr (dt->size);
1675 /* Resolve everything in a gfc_dt structure. */
1678 gfc_resolve_dt (gfc_dt * dt)
1682 RESOLVE_TAG (&tag_format, dt->format_expr);
1683 RESOLVE_TAG (&tag_rec, dt->rec);
1684 RESOLVE_TAG (&tag_advance, dt->advance);
1685 RESOLVE_TAG (&tag_iostat, dt->iostat);
1686 RESOLVE_TAG (&tag_size, dt->size);
1689 if (gfc_resolve_expr (e) == SUCCESS
1690 && (e->ts.type != BT_INTEGER
1691 && (e->ts.type != BT_CHARACTER
1692 || e->expr_type != EXPR_VARIABLE)))
1695 ("UNIT specification at %L must be an INTEGER expression or a "
1696 "CHARACTER variable", &e->where);
1700 /* Sanity checks on data transfer statements. */
1701 if (e->ts.type == BT_CHARACTER)
1703 if (dt->rec != NULL)
1705 gfc_error ("REC tag at %L is incompatible with internal file",
1710 if (dt->namelist != NULL)
1712 gfc_error ("Internal file at %L is incompatible with namelist",
1713 &dt->io_unit->where);
1717 if (dt->advance != NULL)
1719 gfc_error ("ADVANCE tag at %L is incompatible with internal file",
1720 &dt->advance->where);
1725 if (dt->rec != NULL)
1727 if (dt->end != NULL)
1729 gfc_error ("REC tag at %L is incompatible with END tag",
1734 if (dt->format_label == &format_asterisk)
1737 ("END tag at %L is incompatible with list directed format (*)",
1742 if (dt->namelist != NULL)
1744 gfc_error ("REC tag at %L is incompatible with namelist",
1750 if (dt->advance != NULL && dt->format_label == &format_asterisk)
1752 gfc_error ("ADVANCE tag at %L is incompatible with list directed "
1753 "format (*)", &dt->advance->where);
1757 if (dt->eor != 0 && dt->advance == NULL)
1759 gfc_error ("EOR tag at %L requires an ADVANCE tag", &dt->eor_where);
1763 if (dt->size != NULL && dt->advance == NULL)
1765 gfc_error ("SIZE tag at %L requires an ADVANCE tag", &dt->size->where);
1769 /* TODO: Make sure the ADVANCE tag is 'yes' or 'no' if it is a string
1772 if (gfc_reference_st_label (dt->err, ST_LABEL_TARGET) == FAILURE)
1775 if (gfc_reference_st_label (dt->end, ST_LABEL_TARGET) == FAILURE)
1778 if (gfc_reference_st_label (dt->eor, ST_LABEL_TARGET) == FAILURE)
1781 /* Check the format label actually exists. */
1782 if (dt->format_label && dt->format_label != &format_asterisk
1783 && dt->format_label->defined == ST_LABEL_UNKNOWN)
1785 gfc_error ("FORMAT label %d at %L not defined", dt->format_label->value,
1786 &dt->format_label->where);
1793 /* Given an io_kind, return its name. */
1796 io_kind_name (io_kind k)
1815 gfc_internal_error ("io_kind_name(): bad I/O-kind");
1822 /* Match an IO iteration statement of the form:
1824 ( [<IO element> ,] <IO element>, I = <expr>, <expr> [, <expr> ] )
1826 which is equivalent to a single IO element. This function is
1827 mutually recursive with match_io_element(). */
1829 static match match_io_element (io_kind k, gfc_code **);
1832 match_io_iterator (io_kind k, gfc_code ** result)
1834 gfc_code *head, *tail, *new;
1842 old_loc = gfc_current_locus;
1844 if (gfc_match_char ('(') != MATCH_YES)
1847 m = match_io_element (k, &head);
1850 if (m != MATCH_YES || gfc_match_char (',') != MATCH_YES)
1856 /* Can't be anything but an IO iterator. Build a list. */
1857 iter = gfc_get_iterator ();
1861 m = gfc_match_iterator (iter, 0);
1862 if (m == MATCH_ERROR)
1866 gfc_check_do_variable (iter->var->symtree);
1870 m = match_io_element (k, &new);
1871 if (m == MATCH_ERROR)
1880 tail = gfc_append_code (tail, new);
1882 if (gfc_match_char (',') != MATCH_YES)
1891 if (gfc_match_char (')') != MATCH_YES)
1894 new = gfc_get_code ();
1896 new->ext.iterator = iter;
1898 new->block = gfc_get_code ();
1899 new->block->op = EXEC_DO;
1900 new->block->next = head;
1906 gfc_error ("Syntax error in I/O iterator at %C");
1910 gfc_free_iterator (iter, 1);
1911 gfc_free_statements (head);
1912 gfc_current_locus = old_loc;
1917 /* Match a single element of an IO list, which is either a single
1918 expression or an IO Iterator. */
1921 match_io_element (io_kind k, gfc_code ** cpp)
1929 m = match_io_iterator (k, cpp);
1935 m = gfc_match_variable (&expr, 0);
1937 gfc_error ("Expected variable in READ statement at %C");
1941 m = gfc_match_expr (&expr);
1943 gfc_error ("Expected expression in %s statement at %C",
1951 if (expr->symtree->n.sym->attr.intent == INTENT_IN)
1954 ("Variable '%s' in input list at %C cannot be INTENT(IN)",
1955 expr->symtree->n.sym->name);
1960 && gfc_impure_variable (expr->symtree->n.sym)
1961 && current_dt->io_unit->ts.type == BT_CHARACTER)
1963 gfc_error ("Cannot read to variable '%s' in PURE procedure at %C",
1964 expr->symtree->n.sym->name);
1968 if (gfc_check_do_variable (expr->symtree))
1974 if (current_dt->io_unit->ts.type == BT_CHARACTER
1976 && current_dt->io_unit->expr_type == EXPR_VARIABLE
1977 && gfc_impure_variable (current_dt->io_unit->symtree->n.sym))
1980 ("Cannot write to internal file unit '%s' at %C inside a "
1981 "PURE procedure", current_dt->io_unit->symtree->n.sym->name);
1993 gfc_free_expr (expr);
1997 cp = gfc_get_code ();
1998 cp->op = EXEC_TRANSFER;
2006 /* Match an I/O list, building gfc_code structures as we go. */
2009 match_io_list (io_kind k, gfc_code ** head_p)
2011 gfc_code *head, *tail, *new;
2014 *head_p = head = tail = NULL;
2015 if (gfc_match_eos () == MATCH_YES)
2020 m = match_io_element (k, &new);
2021 if (m == MATCH_ERROR)
2026 tail = gfc_append_code (tail, new);
2030 if (gfc_match_eos () == MATCH_YES)
2032 if (gfc_match_char (',') != MATCH_YES)
2040 gfc_error ("Syntax error in %s statement at %C", io_kind_name (k));
2043 gfc_free_statements (head);
2048 /* Attach the data transfer end node. */
2051 terminate_io (gfc_code * io_code)
2055 if (io_code == NULL)
2058 c = gfc_get_code ();
2059 c->op = EXEC_DT_END;
2061 /* Point to structure that is already there */
2062 c->ext.dt = new_st.ext.dt;
2063 gfc_append_code (io_code, c);
2067 /* Match a READ, WRITE or PRINT statement. */
2070 match_io (io_kind k)
2072 char name[GFC_MAX_SYMBOL_LEN + 1];
2082 current_dt = dt = gfc_getmem (sizeof (gfc_dt));
2084 if (gfc_match_char ('(') == MATCH_NO)
2089 if (gfc_current_form == FORM_FREE)
2091 c = gfc_peek_char();
2092 if (c != ' ' && c != '*' && c != '\'' && c != '"')
2099 m = match_dt_format (dt);
2100 if (m == MATCH_ERROR)
2106 dt->io_unit = default_unit (k);
2110 /* Match a control list */
2111 if (match_dt_element (k, dt) == MATCH_YES)
2113 if (match_dt_unit (k, dt) != MATCH_YES)
2116 if (gfc_match_char (')') == MATCH_YES)
2118 if (gfc_match_char (',') != MATCH_YES)
2121 m = match_dt_element (k, dt);
2124 if (m == MATCH_ERROR)
2127 m = match_dt_format (dt);
2130 if (m == MATCH_ERROR)
2133 where = gfc_current_locus;
2135 if (gfc_match_name (name) == MATCH_YES
2136 && !gfc_find_symbol (name, NULL, 1, &sym)
2137 && sym->attr.flavor == FL_NAMELIST)
2140 if (k == M_READ && check_namelist (sym))
2148 gfc_current_locus = where;
2150 goto loop; /* No matches, try regular elements */
2153 if (gfc_match_char (')') == MATCH_YES)
2155 if (gfc_match_char (',') != MATCH_YES)
2161 m = match_dt_element (k, dt);
2164 if (m == MATCH_ERROR)
2167 if (gfc_match_char (')') == MATCH_YES)
2169 if (gfc_match_char (',') != MATCH_YES)
2174 /* Optional leading comma (non-standard). */
2176 && gfc_match_char (',') == MATCH_YES
2178 && gfc_notify_std (GFC_STD_GNU, "Extension: Comma before output "
2179 "item list at %C is an extension") == FAILURE)
2183 if (gfc_match_eos () != MATCH_YES)
2185 if (comma_flag && gfc_match_char (',') != MATCH_YES)
2187 gfc_error ("Expected comma in I/O list at %C");
2192 m = match_io_list (k, &io_code);
2193 if (m == MATCH_ERROR)
2199 /* A full IO statement has been matched. */
2200 if (dt->io_unit->expr_type == EXPR_VARIABLE
2202 && dt->io_unit->ts.type == BT_CHARACTER
2203 && dt->io_unit->symtree->n.sym->attr.intent == INTENT_IN)
2205 gfc_error ("Internal file '%s' at %L is INTENT(IN)",
2206 dt->io_unit->symtree->n.sym->name, &dt->io_unit->where);
2211 expr = dt->format_expr;
2213 if (expr != NULL && expr->expr_type == EXPR_CONSTANT)
2214 check_format_string (expr);
2217 && (k == M_READ || k == M_WRITE)
2218 && dt->io_unit->ts.type != BT_CHARACTER)
2221 ("io-unit in %s statement at %C must be an internal file in a "
2222 "PURE procedure", io_kind_name (k));
2227 new_st.op = (k == M_READ) ? EXEC_READ : EXEC_WRITE;
2229 new_st.next = io_code;
2231 terminate_io (io_code);
2236 gfc_error ("Syntax error in %s statement at %C", io_kind_name (k));
2246 gfc_match_read (void)
2248 return match_io (M_READ);
2252 gfc_match_write (void)
2254 return match_io (M_WRITE);
2258 gfc_match_print (void)
2262 m = match_io (M_PRINT);
2266 if (gfc_pure (NULL))
2268 gfc_error ("PRINT statement at %C not allowed within PURE procedure");
2276 /* Free a gfc_inquire structure. */
2279 gfc_free_inquire (gfc_inquire * inquire)
2282 if (inquire == NULL)
2285 gfc_free_expr (inquire->unit);
2286 gfc_free_expr (inquire->file);
2287 gfc_free_expr (inquire->iostat);
2288 gfc_free_expr (inquire->exist);
2289 gfc_free_expr (inquire->opened);
2290 gfc_free_expr (inquire->number);
2291 gfc_free_expr (inquire->named);
2292 gfc_free_expr (inquire->name);
2293 gfc_free_expr (inquire->access);
2294 gfc_free_expr (inquire->sequential);
2295 gfc_free_expr (inquire->direct);
2296 gfc_free_expr (inquire->form);
2297 gfc_free_expr (inquire->formatted);
2298 gfc_free_expr (inquire->unformatted);
2299 gfc_free_expr (inquire->recl);
2300 gfc_free_expr (inquire->nextrec);
2301 gfc_free_expr (inquire->blank);
2302 gfc_free_expr (inquire->position);
2303 gfc_free_expr (inquire->action);
2304 gfc_free_expr (inquire->read);
2305 gfc_free_expr (inquire->write);
2306 gfc_free_expr (inquire->readwrite);
2307 gfc_free_expr (inquire->delim);
2308 gfc_free_expr (inquire->pad);
2309 gfc_free_expr (inquire->iolength);
2315 /* Match an element of an INQUIRE statement. */
2317 #define RETM if (m != MATCH_NO) return m;
2320 match_inquire_element (gfc_inquire * inquire)
2324 m = match_etag (&tag_unit, &inquire->unit);
2325 RETM m = match_etag (&tag_file, &inquire->file);
2326 RETM m = match_ltag (&tag_err, &inquire->err);
2327 RETM m = match_out_tag (&tag_iostat, &inquire->iostat);
2328 RETM m = match_vtag (&tag_exist, &inquire->exist);
2329 RETM m = match_vtag (&tag_opened, &inquire->opened);
2330 RETM m = match_vtag (&tag_named, &inquire->named);
2331 RETM m = match_vtag (&tag_name, &inquire->name);
2332 RETM m = match_out_tag (&tag_number, &inquire->number);
2333 RETM m = match_vtag (&tag_s_access, &inquire->access);
2334 RETM m = match_vtag (&tag_sequential, &inquire->sequential);
2335 RETM m = match_vtag (&tag_direct, &inquire->direct);
2336 RETM m = match_vtag (&tag_s_form, &inquire->form);
2337 RETM m = match_vtag (&tag_formatted, &inquire->formatted);
2338 RETM m = match_vtag (&tag_unformatted, &inquire->unformatted);
2339 RETM m = match_out_tag (&tag_s_recl, &inquire->recl);
2340 RETM m = match_out_tag (&tag_nextrec, &inquire->nextrec);
2341 RETM m = match_vtag (&tag_s_blank, &inquire->blank);
2342 RETM m = match_vtag (&tag_s_position, &inquire->position);
2343 RETM m = match_vtag (&tag_s_action, &inquire->action);
2344 RETM m = match_vtag (&tag_read, &inquire->read);
2345 RETM m = match_vtag (&tag_write, &inquire->write);
2346 RETM m = match_vtag (&tag_readwrite, &inquire->readwrite);
2347 RETM m = match_vtag (&tag_s_delim, &inquire->delim);
2348 RETM m = match_vtag (&tag_s_pad, &inquire->pad);
2349 RETM m = match_vtag (&tag_iolength, &inquire->iolength);
2350 RETM return MATCH_NO;
2357 gfc_match_inquire (void)
2359 gfc_inquire *inquire;
2363 m = gfc_match_char ('(');
2367 inquire = gfc_getmem (sizeof (gfc_inquire));
2369 m = match_inquire_element (inquire);
2370 if (m == MATCH_ERROR)
2374 m = gfc_match_expr (&inquire->unit);
2375 if (m == MATCH_ERROR)
2381 /* See if we have the IOLENGTH form of the inquire statement. */
2382 if (inquire->iolength != NULL)
2384 if (gfc_match_char (')') != MATCH_YES)
2387 m = match_io_list (M_INQUIRE, &code);
2388 if (m == MATCH_ERROR)
2393 terminate_io (code);
2395 new_st.op = EXEC_IOLENGTH;
2396 new_st.expr = inquire->iolength;
2397 new_st.ext.inquire = inquire;
2399 if (gfc_pure (NULL))
2401 gfc_free_statements (code);
2402 gfc_error ("INQUIRE statement not allowed in PURE procedure at %C");
2410 /* At this point, we have the non-IOLENGTH inquire statement. */
2413 if (gfc_match_char (')') == MATCH_YES)
2415 if (gfc_match_char (',') != MATCH_YES)
2418 m = match_inquire_element (inquire);
2419 if (m == MATCH_ERROR)
2424 if (inquire->iolength != NULL)
2426 gfc_error ("IOLENGTH tag invalid in INQUIRE statement at %C");
2431 if (gfc_match_eos () != MATCH_YES)
2434 if (gfc_pure (NULL))
2436 gfc_error ("INQUIRE statement not allowed in PURE procedure at %C");
2440 new_st.op = EXEC_INQUIRE;
2441 new_st.ext.inquire = inquire;
2445 gfc_syntax_error (ST_INQUIRE);
2448 gfc_free_inquire (inquire);
2453 /* Resolve everything in a gfc_inquire structure. */
2456 gfc_resolve_inquire (gfc_inquire * inquire)
2459 RESOLVE_TAG (&tag_unit, inquire->unit);
2460 RESOLVE_TAG (&tag_file, inquire->file);
2461 RESOLVE_TAG (&tag_iostat, inquire->iostat);
2462 RESOLVE_TAG (&tag_exist, inquire->exist);
2463 RESOLVE_TAG (&tag_opened, inquire->opened);
2464 RESOLVE_TAG (&tag_number, inquire->number);
2465 RESOLVE_TAG (&tag_named, inquire->named);
2466 RESOLVE_TAG (&tag_name, inquire->name);
2467 RESOLVE_TAG (&tag_s_access, inquire->access);
2468 RESOLVE_TAG (&tag_sequential, inquire->sequential);
2469 RESOLVE_TAG (&tag_direct, inquire->direct);
2470 RESOLVE_TAG (&tag_s_form, inquire->form);
2471 RESOLVE_TAG (&tag_formatted, inquire->formatted);
2472 RESOLVE_TAG (&tag_unformatted, inquire->unformatted);
2473 RESOLVE_TAG (&tag_s_recl, inquire->recl);
2474 RESOLVE_TAG (&tag_nextrec, inquire->nextrec);
2475 RESOLVE_TAG (&tag_s_blank, inquire->blank);
2476 RESOLVE_TAG (&tag_s_position, inquire->position);
2477 RESOLVE_TAG (&tag_s_action, inquire->action);
2478 RESOLVE_TAG (&tag_read, inquire->read);
2479 RESOLVE_TAG (&tag_write, inquire->write);
2480 RESOLVE_TAG (&tag_readwrite, inquire->readwrite);
2481 RESOLVE_TAG (&tag_s_delim, inquire->delim);
2482 RESOLVE_TAG (&tag_s_pad, inquire->pad);
2483 RESOLVE_TAG (&tag_iolength, inquire->iolength);
2485 if (gfc_reference_st_label (inquire->err, ST_LABEL_TARGET) == FAILURE)