1 /* Deal with I/O statements & related stuff.
2 Copyright (C) 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008,
4 Free Software Foundation, Inc.
5 Contributed by Andy Vaught
7 This file is part of GCC.
9 GCC is free software; you can redistribute it and/or modify it under
10 the terms of the GNU General Public License as published by the Free
11 Software Foundation; either version 3, or (at your option) any later
14 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
15 WARRANTY; without even the implied warranty of MERCHANTABILITY or
16 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
19 You should have received a copy of the GNU General Public License
20 along with GCC; see the file COPYING3. If not see
21 <http://www.gnu.org/licenses/>. */
31 format_asterisk = {0, NULL, NULL, -1, ST_LABEL_FORMAT, ST_LABEL_FORMAT, NULL,
36 const char *name, *spec, *value;
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_e_decimal = {"DECIMAL", " decimal =", " %e", BT_CHARACTER},
53 tag_e_encoding = {"ENCODING", " encoding =", " %e", BT_CHARACTER},
54 tag_e_async = {"ASYNCHRONOUS", " asynchronous =", " %e", BT_CHARACTER},
55 tag_e_round = {"ROUND", " round =", " %e", BT_CHARACTER},
56 tag_e_sign = {"SIGN", " sign =", " %e", BT_CHARACTER},
57 tag_unit = {"UNIT", " unit =", " %e", BT_INTEGER},
58 tag_advance = {"ADVANCE", " advance =", " %e", BT_CHARACTER},
59 tag_rec = {"REC", " rec =", " %e", BT_INTEGER},
60 tag_spos = {"POSITION", " pos =", " %e", BT_INTEGER},
61 tag_format = {"FORMAT", NULL, NULL, BT_CHARACTER},
62 tag_iomsg = {"IOMSG", " iomsg =", " %e", BT_CHARACTER},
63 tag_iostat = {"IOSTAT", " iostat =", " %v", BT_INTEGER},
64 tag_size = {"SIZE", " size =", " %v", BT_INTEGER},
65 tag_exist = {"EXIST", " exist =", " %v", BT_LOGICAL},
66 tag_opened = {"OPENED", " opened =", " %v", BT_LOGICAL},
67 tag_named = {"NAMED", " named =", " %v", BT_LOGICAL},
68 tag_name = {"NAME", " name =", " %v", BT_CHARACTER},
69 tag_number = {"NUMBER", " number =", " %v", BT_INTEGER},
70 tag_s_access = {"ACCESS", " access =", " %v", BT_CHARACTER},
71 tag_sequential = {"SEQUENTIAL", " sequential =", " %v", BT_CHARACTER},
72 tag_direct = {"DIRECT", " direct =", " %v", BT_CHARACTER},
73 tag_s_form = {"FORM", " form =", " %v", BT_CHARACTER},
74 tag_formatted = {"FORMATTED", " formatted =", " %v", BT_CHARACTER},
75 tag_unformatted = {"UNFORMATTED", " unformatted =", " %v", BT_CHARACTER},
76 tag_s_recl = {"RECL", " recl =", " %v", BT_INTEGER},
77 tag_nextrec = {"NEXTREC", " nextrec =", " %v", BT_INTEGER},
78 tag_s_blank = {"BLANK", " blank =", " %v", BT_CHARACTER},
79 tag_s_position = {"POSITION", " position =", " %v", BT_CHARACTER},
80 tag_s_action = {"ACTION", " action =", " %v", BT_CHARACTER},
81 tag_read = {"READ", " read =", " %v", BT_CHARACTER},
82 tag_write = {"WRITE", " write =", " %v", BT_CHARACTER},
83 tag_readwrite = {"READWRITE", " readwrite =", " %v", BT_CHARACTER},
84 tag_s_delim = {"DELIM", " delim =", " %v", BT_CHARACTER},
85 tag_s_pad = {"PAD", " pad =", " %v", BT_CHARACTER},
86 tag_s_decimal = {"DECIMAL", " decimal =", " %v", BT_CHARACTER},
87 tag_s_encoding = {"ENCODING", " encoding =", " %v", BT_CHARACTER},
88 tag_s_async = {"ASYNCHRONOUS", " asynchronous =", " %v", BT_CHARACTER},
89 tag_s_round = {"ROUND", " round =", " %v", BT_CHARACTER},
90 tag_s_sign = {"SIGN", " sign =", " %v", BT_CHARACTER},
91 tag_iolength = {"IOLENGTH", " iolength =", " %v", BT_INTEGER},
92 tag_convert = {"CONVERT", " convert =", " %e", BT_CHARACTER},
93 tag_strm_out = {"POS", " pos =", " %v", BT_INTEGER},
94 tag_err = {"ERR", " err =", " %l", BT_UNKNOWN},
95 tag_end = {"END", " end =", " %l", BT_UNKNOWN},
96 tag_eor = {"EOR", " eor =", " %l", BT_UNKNOWN},
97 tag_id = {"ID", " id =", " %v", BT_INTEGER},
98 tag_pending = {"PENDING", " pending =", " %v", BT_LOGICAL},
99 tag_newunit = {"NEWUNIT", " newunit =", " %v", BT_INTEGER};
101 static gfc_dt *current_dt;
103 #define RESOLVE_TAG(x, y) if (resolve_tag(x, y) == FAILURE) return FAILURE;
106 /**************** Fortran 95 FORMAT parser *****************/
108 /* FORMAT tokens returned by format_lex(). */
111 FMT_NONE, FMT_UNKNOWN, FMT_SIGNED_INT, FMT_ZERO, FMT_POSINT, FMT_PERIOD,
112 FMT_COMMA, FMT_COLON, FMT_SLASH, FMT_DOLLAR, FMT_LPAREN,
113 FMT_RPAREN, FMT_X, FMT_SIGN, FMT_BLANK, FMT_CHAR, FMT_P, FMT_IBOZ, FMT_F,
114 FMT_E, FMT_EN, FMT_ES, FMT_G, FMT_L, FMT_A, FMT_D, FMT_H, FMT_END,
115 FMT_ERROR, FMT_DC, FMT_DP, FMT_T, FMT_TR, FMT_TL, FMT_STAR, FMT_RC,
116 FMT_RD, FMT_RN, FMT_RP, FMT_RU, FMT_RZ
120 /* Local variables for checking format strings. The saved_token is
121 used to back up by a single format token during the parsing
123 static gfc_char_t *format_string;
124 static int format_string_pos;
125 static int format_length, use_last_char;
126 static char error_element;
127 static locus format_locus;
129 static format_token saved_token;
132 { MODE_STRING, MODE_FORMAT, MODE_COPY }
136 /* Return the next character in the format string. */
139 next_char (gfc_instring in_string)
151 if (mode == MODE_STRING)
152 c = *format_string++;
155 c = gfc_next_char_literal (in_string);
160 if (gfc_option.flag_backslash && c == '\\')
162 locus old_locus = gfc_current_locus;
164 if (gfc_match_special_char (&c) == MATCH_NO)
165 gfc_current_locus = old_locus;
167 if (!(gfc_option.allow_std & GFC_STD_GNU) && !inhibit_warnings)
168 gfc_warning ("Extension: backslash character at %C");
171 if (mode == MODE_COPY)
172 *format_string++ = c;
174 if (mode != MODE_STRING)
175 format_locus = gfc_current_locus;
179 c = gfc_wide_toupper (c);
184 /* Back up one character position. Only works once. */
192 /* Eat up the spaces and return a character. */
195 next_char_not_space (bool *error)
200 error_element = c = next_char (NONSTRING);
203 if (gfc_option.allow_std & GFC_STD_GNU)
204 gfc_warning ("Extension: Tab character in format at %C");
207 gfc_error ("Extension: Tab character in format at %C");
213 while (gfc_is_whitespace (c));
217 static int value = 0;
219 /* Simple lexical analyzer for getting the next token in a FORMAT
231 if (saved_token != FMT_NONE)
234 saved_token = FMT_NONE;
238 c = next_char_not_space (&error);
246 c = next_char_not_space (&error);
257 c = next_char_not_space (&error);
259 value = 10 * value + c - '0';
268 token = FMT_SIGNED_INT;
287 c = next_char_not_space (&error);
290 value = 10 * value + c - '0';
298 token = zflag ? FMT_ZERO : FMT_POSINT;
322 c = next_char_not_space (&error);
350 c = next_char_not_space (&error);
351 if (c != 'P' && c != 'S')
358 c = next_char_not_space (&error);
359 if (c == 'N' || c == 'Z')
377 c = next_char (INSTRING_WARN);
386 c = next_char (INSTRING_NOWARN);
420 c = next_char_not_space (&error);
450 c = next_char_not_space (&error);
453 if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: DP format "
454 "specifier not allowed at %C") == FAILURE)
460 if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: DC format "
461 "specifier not allowed at %C") == FAILURE)
473 c = next_char_not_space (&error);
522 token_to_string (format_token t)
541 /* Check a format statement. The format string, either from a FORMAT
542 statement or a constant in an I/O statement has already been parsed
543 by itself, and we are checking it for validity. The dual origin
544 means that the warning message is a little less than great. */
547 check_format (bool is_input)
549 const char *posint_required = _("Positive width required");
550 const char *nonneg_required = _("Nonnegative width required");
551 const char *unexpected_element = _("Unexpected element '%c' in format string"
553 const char *unexpected_end = _("Unexpected end of format string");
554 const char *zero_width = _("Zero width in format descriptor");
563 saved_token = FMT_NONE;
567 format_string_pos = 0;
574 error = _("Missing leading left parenthesis");
582 goto finished; /* Empty format is legal */
586 /* In this state, the next thing has to be a format item. */
603 error = _("Left parenthesis required after '*'");
628 /* Signed integer can only precede a P format. */
634 error = _("Expected P edit descriptor");
641 /* P requires a prior number. */
642 error = _("P descriptor requires leading scale factor");
646 /* X requires a prior number if we're being pedantic. */
647 if (mode != MODE_FORMAT)
648 format_locus.nextc += format_string_pos;
649 if (gfc_notify_std (GFC_STD_GNU, "Extension: X descriptor "
650 "requires leading space count at %L", &format_locus)
668 goto extension_optional_comma;
679 if (gfc_notify_std (GFC_STD_GNU, "Extension: $ descriptor at %L",
680 &format_locus) == FAILURE)
682 if (t != FMT_RPAREN || level > 0)
684 gfc_warning ("$ should be the last specifier in format at %L",
686 goto optional_comma_1;
707 error = unexpected_end;
711 error = unexpected_element;
716 /* In this state, t must currently be a data descriptor.
717 Deal with things that can/must follow the descriptor. */
728 /* No comma after P allowed only for F, E, EN, ES, D, or G.
733 if (!(gfc_option.allow_std & GFC_STD_F2003) && t != FMT_COMMA
734 && t != FMT_F && t != FMT_E && t != FMT_EN && t != FMT_ES
735 && t != FMT_D && t != FMT_G && t != FMT_RPAREN && t != FMT_SLASH)
737 error = _("Comma required after P descriptor");
748 if (t != FMT_F && t != FMT_E && t != FMT_EN && t != FMT_ES && t != FMT_D
749 && t != FMT_G && t != FMT_RPAREN && t != FMT_SLASH)
751 error = _("Comma required after P descriptor");
765 error = _("Positive width required with T descriptor");
777 switch (gfc_notification_std (GFC_STD_GNU))
780 if (mode != MODE_FORMAT)
781 format_locus.nextc += format_string_pos;
782 gfc_warning ("Extension: Missing positive width after L "
783 "descriptor at %L", &format_locus);
788 error = posint_required;
819 if (t == FMT_G && u == FMT_ZERO)
826 if (gfc_notify_std (GFC_STD_F2008, "Fortran 2008: 'G0' in "
827 "format at %L", &format_locus) == FAILURE)
838 error = posint_required;
844 error = _("E specifier not allowed with g0 descriptor");
853 format_locus.nextc += format_string_pos;
854 gfc_error ("Positive width required in format "
855 "specifier %s at %L", token_to_string (t),
866 /* Warn if -std=legacy, otherwise error. */
867 format_locus.nextc += format_string_pos;
868 if (gfc_option.warn_std != 0)
870 gfc_error ("Period required in format "
871 "specifier %s at %L", token_to_string (t),
877 gfc_warning ("Period required in format "
878 "specifier %s at %L", token_to_string (t),
880 /* If we go to finished, we need to unwind this
881 before the next round. */
882 format_locus.nextc -= format_string_pos;
890 if (u != FMT_ZERO && u != FMT_POSINT)
892 error = nonneg_required;
899 /* Look for optional exponent. */
914 error = _("Positive exponent width required");
925 if (t != FMT_ZERO && t != FMT_POSINT)
927 error = nonneg_required;
930 else if (is_input && t == FMT_ZERO)
932 error = posint_required;
941 /* Warn if -std=legacy, otherwise error. */
942 if (gfc_option.warn_std != 0)
944 error = _("Period required in format specifier");
947 if (mode != MODE_FORMAT)
948 format_locus.nextc += format_string_pos;
949 gfc_warning ("Period required in format specifier at %L",
958 if (t != FMT_ZERO && t != FMT_POSINT)
960 error = nonneg_required;
967 if (!(gfc_option.allow_std & GFC_STD_GNU) && !inhibit_warnings)
969 if (mode != MODE_FORMAT)
970 format_locus.nextc += format_string_pos;
971 gfc_warning ("The H format specifier at %L is"
972 " a Fortran 95 deleted feature", &format_locus);
974 if (mode == MODE_STRING)
976 format_string += value;
977 format_length -= value;
978 format_string_pos += repeat;
984 next_char (INSTRING_WARN);
994 if (t != FMT_ZERO && t != FMT_POSINT)
996 error = nonneg_required;
999 else if (is_input && t == FMT_ZERO)
1001 error = posint_required;
1008 if (t != FMT_PERIOD)
1017 if (t != FMT_ZERO && t != FMT_POSINT)
1019 error = nonneg_required;
1027 error = unexpected_element;
1032 /* Between a descriptor and what comes next. */
1050 goto optional_comma;
1053 error = unexpected_end;
1057 if (mode != MODE_FORMAT)
1058 format_locus.nextc += format_string_pos - 1;
1059 if (gfc_notify_std (GFC_STD_GNU, "Extension: Missing comma at %L",
1060 &format_locus) == FAILURE)
1062 /* If we do not actually return a failure, we need to unwind this
1063 before the next round. */
1064 if (mode != MODE_FORMAT)
1065 format_locus.nextc -= format_string_pos;
1070 /* Optional comma is a weird between state where we've just finished
1071 reading a colon, slash, dollar or P descriptor. */
1088 /* Assume that we have another format item. */
1095 extension_optional_comma:
1096 /* As a GNU extension, permit a missing comma after a string literal. */
1113 goto optional_comma;
1116 error = unexpected_end;
1120 if (mode != MODE_FORMAT)
1121 format_locus.nextc += format_string_pos;
1122 if (gfc_notify_std (GFC_STD_GNU, "Extension: Missing comma at %L",
1123 &format_locus) == FAILURE)
1125 /* If we do not actually return a failure, we need to unwind this
1126 before the next round. */
1127 if (mode != MODE_FORMAT)
1128 format_locus.nextc -= format_string_pos;
1136 if (mode != MODE_FORMAT)
1137 format_locus.nextc += format_string_pos;
1138 if (error == unexpected_element)
1139 gfc_error (error, error_element, &format_locus);
1141 gfc_error ("%s in format string at %L", error, &format_locus);
1150 /* Given an expression node that is a constant string, see if it looks
1151 like a format string. */
1154 check_format_string (gfc_expr *e, bool is_input)
1158 if (!e || e->ts.type != BT_CHARACTER || e->expr_type != EXPR_CONSTANT)
1162 format_string = e->value.character.string;
1164 /* More elaborate measures are needed to show where a problem is within a
1165 format string that has been calculated, but that's probably not worth the
1167 format_locus = e->where;
1168 rv = check_format (is_input);
1169 /* check for extraneous characters at the end of an otherwise valid format
1170 string, like '(A10,I3)F5'
1171 start at the end and move back to the last character processed,
1173 if (rv == SUCCESS && e->value.character.length > format_string_pos)
1174 for (i=e->value.character.length-1;i>format_string_pos-1;i--)
1175 if (e->value.character.string[i] != ' ')
1177 format_locus.nextc += format_length + 1;
1178 gfc_warning ("Extraneous characters in format at %L", &format_locus);
1185 /************ Fortran 95 I/O statement matchers *************/
1187 /* Match a FORMAT statement. This amounts to actually parsing the
1188 format descriptors in order to correctly locate the end of the
1192 gfc_match_format (void)
1197 if (gfc_current_ns->proc_name
1198 && gfc_current_ns->proc_name->attr.flavor == FL_MODULE)
1200 gfc_error ("Format statement in module main block at %C");
1204 if (gfc_statement_label == NULL)
1206 gfc_error ("Missing format label at %C");
1209 gfc_gobble_whitespace ();
1214 start = gfc_current_locus;
1216 if (check_format (false) == FAILURE)
1219 if (gfc_match_eos () != MATCH_YES)
1221 gfc_syntax_error (ST_FORMAT);
1225 /* The label doesn't get created until after the statement is done
1226 being matched, so we have to leave the string for later. */
1228 gfc_current_locus = start; /* Back to the beginning */
1231 new_st.op = EXEC_NOP;
1233 e = gfc_get_character_expr (gfc_default_character_kind, &start,
1234 NULL, format_length);
1235 format_string = e->value.character.string;
1236 gfc_statement_label->format = e;
1239 check_format (false); /* Guaranteed to succeed */
1240 gfc_match_eos (); /* Guaranteed to succeed */
1246 /* Match an expression I/O tag of some sort. */
1249 match_etag (const io_tag *tag, gfc_expr **v)
1254 m = gfc_match (tag->spec);
1258 m = gfc_match (tag->value, &result);
1261 gfc_error ("Invalid value for %s specification at %C", tag->name);
1267 gfc_error ("Duplicate %s specification at %C", tag->name);
1268 gfc_free_expr (result);
1277 /* Match a variable I/O tag of some sort. */
1280 match_vtag (const io_tag *tag, gfc_expr **v)
1285 m = gfc_match (tag->spec);
1289 m = gfc_match (tag->value, &result);
1292 gfc_error ("Invalid value for %s specification at %C", tag->name);
1298 gfc_error ("Duplicate %s specification at %C", tag->name);
1299 gfc_free_expr (result);
1303 if (result->symtree->n.sym->attr.intent == INTENT_IN)
1305 gfc_error ("Variable %s cannot be INTENT(IN) at %C", tag->name);
1306 gfc_free_expr (result);
1310 if (gfc_pure (NULL) && gfc_impure_variable (result->symtree->n.sym))
1312 gfc_error ("Variable %s cannot be assigned in PURE procedure at %C",
1314 gfc_free_expr (result);
1318 if (gfc_implicit_pure (NULL) && gfc_impure_variable (result->symtree->n.sym))
1319 gfc_current_ns->proc_name->attr.implicit_pure = 0;
1326 /* Match I/O tags that cause variables to become redefined. */
1329 match_out_tag (const io_tag *tag, gfc_expr **result)
1333 m = match_vtag (tag, result);
1335 gfc_check_do_variable ((*result)->symtree);
1341 /* Match a label I/O tag. */
1344 match_ltag (const io_tag *tag, gfc_st_label ** label)
1350 m = gfc_match (tag->spec);
1354 m = gfc_match (tag->value, label);
1357 gfc_error ("Invalid value for %s specification at %C", tag->name);
1363 gfc_error ("Duplicate %s label specification at %C", tag->name);
1367 if (gfc_reference_st_label (*label, ST_LABEL_TARGET) == FAILURE)
1374 /* Resolution of the FORMAT tag, to be called from resolve_tag. */
1377 resolve_tag_format (const gfc_expr *e)
1379 if (e->expr_type == EXPR_CONSTANT
1380 && (e->ts.type != BT_CHARACTER
1381 || e->ts.kind != gfc_default_character_kind))
1383 gfc_error ("Constant expression in FORMAT tag at %L must be "
1384 "of type default CHARACTER", &e->where);
1388 /* If e's rank is zero and e is not an element of an array, it should be
1389 of integer or character type. The integer variable should be
1392 && (e->expr_type != EXPR_VARIABLE
1393 || e->symtree == NULL
1394 || e->symtree->n.sym->as == NULL
1395 || e->symtree->n.sym->as->rank == 0))
1397 if ((e->ts.type != BT_CHARACTER
1398 || e->ts.kind != gfc_default_character_kind)
1399 && e->ts.type != BT_INTEGER)
1401 gfc_error ("FORMAT tag at %L must be of type default-kind CHARACTER "
1402 "or of INTEGER", &e->where);
1405 else if (e->ts.type == BT_INTEGER && e->expr_type == EXPR_VARIABLE)
1407 if (gfc_notify_std (GFC_STD_F95_DEL, "Deleted feature: ASSIGNED "
1408 "variable in FORMAT tag at %L", &e->where)
1411 if (e->symtree->n.sym->attr.assign != 1)
1413 gfc_error ("Variable '%s' at %L has not been assigned a "
1414 "format label", e->symtree->n.sym->name, &e->where);
1418 else if (e->ts.type == BT_INTEGER)
1420 gfc_error ("Scalar '%s' in FORMAT tag at %L is not an ASSIGNED "
1421 "variable", gfc_basic_typename (e->ts.type), &e->where);
1428 /* If rank is nonzero and type is not character, we allow it under GFC_STD_LEGACY.
1429 It may be assigned an Hollerith constant. */
1430 if (e->ts.type != BT_CHARACTER)
1432 if (gfc_notify_std (GFC_STD_LEGACY, "Extension: Non-character "
1433 "in FORMAT tag at %L", &e->where) == FAILURE)
1436 if (e->rank == 0 && e->symtree->n.sym->as->type == AS_ASSUMED_SHAPE)
1438 gfc_error ("Non-character assumed shape array element in FORMAT"
1439 " tag at %L", &e->where);
1443 if (e->rank == 0 && e->symtree->n.sym->as->type == AS_ASSUMED_SIZE)
1445 gfc_error ("Non-character assumed size array element in FORMAT"
1446 " tag at %L", &e->where);
1450 if (e->rank == 0 && e->symtree->n.sym->attr.pointer)
1452 gfc_error ("Non-character pointer array element in FORMAT tag at %L",
1462 /* Do expression resolution and type-checking on an expression tag. */
1465 resolve_tag (const io_tag *tag, gfc_expr *e)
1470 if (gfc_resolve_expr (e) == FAILURE)
1473 if (tag == &tag_format)
1474 return resolve_tag_format (e);
1476 if (e->ts.type != tag->type)
1478 gfc_error ("%s tag at %L must be of type %s", tag->name,
1479 &e->where, gfc_basic_typename (tag->type));
1483 if (e->ts.type == BT_CHARACTER && e->ts.kind != gfc_default_character_kind)
1485 gfc_error ("%s tag at %L must be a character string of default kind",
1486 tag->name, &e->where);
1492 gfc_error ("%s tag at %L must be scalar", tag->name, &e->where);
1496 if (tag == &tag_iomsg)
1498 if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: IOMSG tag at %L",
1499 &e->where) == FAILURE)
1503 if ((tag == &tag_iostat || tag == &tag_size || tag == &tag_iolength)
1504 && e->ts.kind != gfc_default_integer_kind)
1506 if (gfc_notify_std (GFC_STD_F2003, "Fortran 95 requires default "
1507 "INTEGER in %s tag at %L", tag->name, &e->where)
1512 if (tag == &tag_exist && e->ts.kind != gfc_default_logical_kind)
1514 if (gfc_notify_std (GFC_STD_F2008, "Fortran 2008: Nondefault LOGICAL "
1515 "in %s tag at %L", tag->name, &e->where)
1520 if (tag == &tag_newunit)
1522 if (gfc_notify_std (GFC_STD_F2008, "Fortran 2008: NEWUNIT specifier"
1523 " at %L", &e->where) == FAILURE)
1527 /* NEWUNIT, IOSTAT, SIZE and IOMSG are variable definition contexts. */
1528 if (tag == &tag_newunit || tag == &tag_iostat
1529 || tag == &tag_size || tag == &tag_iomsg)
1533 sprintf (context, _("%s tag"), tag->name);
1534 if (gfc_check_vardef_context (e, false, false, context) == FAILURE)
1538 if (tag == &tag_convert)
1540 if (gfc_notify_std (GFC_STD_GNU, "Extension: CONVERT tag at %L",
1541 &e->where) == FAILURE)
1549 /* Match a single tag of an OPEN statement. */
1552 match_open_element (gfc_open *open)
1556 m = match_etag (&tag_e_async, &open->asynchronous);
1559 m = match_etag (&tag_unit, &open->unit);
1562 m = match_out_tag (&tag_iomsg, &open->iomsg);
1565 m = match_out_tag (&tag_iostat, &open->iostat);
1568 m = match_etag (&tag_file, &open->file);
1571 m = match_etag (&tag_status, &open->status);
1574 m = match_etag (&tag_e_access, &open->access);
1577 m = match_etag (&tag_e_form, &open->form);
1580 m = match_etag (&tag_e_recl, &open->recl);
1583 m = match_etag (&tag_e_blank, &open->blank);
1586 m = match_etag (&tag_e_position, &open->position);
1589 m = match_etag (&tag_e_action, &open->action);
1592 m = match_etag (&tag_e_delim, &open->delim);
1595 m = match_etag (&tag_e_pad, &open->pad);
1598 m = match_etag (&tag_e_decimal, &open->decimal);
1601 m = match_etag (&tag_e_encoding, &open->encoding);
1604 m = match_etag (&tag_e_round, &open->round);
1607 m = match_etag (&tag_e_sign, &open->sign);
1610 m = match_ltag (&tag_err, &open->err);
1613 m = match_etag (&tag_convert, &open->convert);
1616 m = match_out_tag (&tag_newunit, &open->newunit);
1624 /* Free the gfc_open structure and all the expressions it contains. */
1627 gfc_free_open (gfc_open *open)
1632 gfc_free_expr (open->unit);
1633 gfc_free_expr (open->iomsg);
1634 gfc_free_expr (open->iostat);
1635 gfc_free_expr (open->file);
1636 gfc_free_expr (open->status);
1637 gfc_free_expr (open->access);
1638 gfc_free_expr (open->form);
1639 gfc_free_expr (open->recl);
1640 gfc_free_expr (open->blank);
1641 gfc_free_expr (open->position);
1642 gfc_free_expr (open->action);
1643 gfc_free_expr (open->delim);
1644 gfc_free_expr (open->pad);
1645 gfc_free_expr (open->decimal);
1646 gfc_free_expr (open->encoding);
1647 gfc_free_expr (open->round);
1648 gfc_free_expr (open->sign);
1649 gfc_free_expr (open->convert);
1650 gfc_free_expr (open->asynchronous);
1651 gfc_free_expr (open->newunit);
1656 /* Resolve everything in a gfc_open structure. */
1659 gfc_resolve_open (gfc_open *open)
1662 RESOLVE_TAG (&tag_unit, open->unit);
1663 RESOLVE_TAG (&tag_iomsg, open->iomsg);
1664 RESOLVE_TAG (&tag_iostat, open->iostat);
1665 RESOLVE_TAG (&tag_file, open->file);
1666 RESOLVE_TAG (&tag_status, open->status);
1667 RESOLVE_TAG (&tag_e_access, open->access);
1668 RESOLVE_TAG (&tag_e_form, open->form);
1669 RESOLVE_TAG (&tag_e_recl, open->recl);
1670 RESOLVE_TAG (&tag_e_blank, open->blank);
1671 RESOLVE_TAG (&tag_e_position, open->position);
1672 RESOLVE_TAG (&tag_e_action, open->action);
1673 RESOLVE_TAG (&tag_e_delim, open->delim);
1674 RESOLVE_TAG (&tag_e_pad, open->pad);
1675 RESOLVE_TAG (&tag_e_decimal, open->decimal);
1676 RESOLVE_TAG (&tag_e_encoding, open->encoding);
1677 RESOLVE_TAG (&tag_e_async, open->asynchronous);
1678 RESOLVE_TAG (&tag_e_round, open->round);
1679 RESOLVE_TAG (&tag_e_sign, open->sign);
1680 RESOLVE_TAG (&tag_convert, open->convert);
1681 RESOLVE_TAG (&tag_newunit, open->newunit);
1683 if (gfc_reference_st_label (open->err, ST_LABEL_TARGET) == FAILURE)
1690 /* Check if a given value for a SPECIFIER is either in the list of values
1691 allowed in F95 or F2003, issuing an error message and returning a zero
1692 value if it is not allowed. */
1695 compare_to_allowed_values (const char *specifier, const char *allowed[],
1696 const char *allowed_f2003[],
1697 const char *allowed_gnu[], gfc_char_t *value,
1698 const char *statement, bool warn)
1703 len = gfc_wide_strlen (value);
1706 for (len--; len > 0; len--)
1707 if (value[len] != ' ')
1712 for (i = 0; allowed[i]; i++)
1713 if (len == strlen (allowed[i])
1714 && gfc_wide_strncasecmp (value, allowed[i], strlen (allowed[i])) == 0)
1717 for (i = 0; allowed_f2003 && allowed_f2003[i]; i++)
1718 if (len == strlen (allowed_f2003[i])
1719 && gfc_wide_strncasecmp (value, allowed_f2003[i],
1720 strlen (allowed_f2003[i])) == 0)
1722 notification n = gfc_notification_std (GFC_STD_F2003);
1724 if (n == WARNING || (warn && n == ERROR))
1726 gfc_warning ("Fortran 2003: %s specifier in %s statement at %C "
1727 "has value '%s'", specifier, statement,
1734 gfc_notify_std (GFC_STD_F2003, "Fortran 2003: %s specifier in "
1735 "%s statement at %C has value '%s'", specifier,
1736 statement, allowed_f2003[i]);
1744 for (i = 0; allowed_gnu && allowed_gnu[i]; i++)
1745 if (len == strlen (allowed_gnu[i])
1746 && gfc_wide_strncasecmp (value, allowed_gnu[i],
1747 strlen (allowed_gnu[i])) == 0)
1749 notification n = gfc_notification_std (GFC_STD_GNU);
1751 if (n == WARNING || (warn && n == ERROR))
1753 gfc_warning ("Extension: %s specifier in %s statement at %C "
1754 "has value '%s'", specifier, statement,
1761 gfc_notify_std (GFC_STD_GNU, "Extension: %s specifier in "
1762 "%s statement at %C has value '%s'", specifier,
1763 statement, allowed_gnu[i]);
1773 char *s = gfc_widechar_to_char (value, -1);
1774 gfc_warning ("%s specifier in %s statement at %C has invalid value '%s'",
1775 specifier, statement, s);
1781 char *s = gfc_widechar_to_char (value, -1);
1782 gfc_error ("%s specifier in %s statement at %C has invalid value '%s'",
1783 specifier, statement, s);
1790 /* Match an OPEN statement. */
1793 gfc_match_open (void)
1799 m = gfc_match_char ('(');
1803 open = XCNEW (gfc_open);
1805 m = match_open_element (open);
1807 if (m == MATCH_ERROR)
1811 m = gfc_match_expr (&open->unit);
1812 if (m == MATCH_ERROR)
1818 if (gfc_match_char (')') == MATCH_YES)
1820 if (gfc_match_char (',') != MATCH_YES)
1823 m = match_open_element (open);
1824 if (m == MATCH_ERROR)
1830 if (gfc_match_eos () == MATCH_NO)
1833 if (gfc_pure (NULL))
1835 gfc_error ("OPEN statement not allowed in PURE procedure at %C");
1839 if (gfc_implicit_pure (NULL))
1840 gfc_current_ns->proc_name->attr.implicit_pure = 0;
1842 warn = (open->err || open->iostat) ? true : false;
1844 /* Checks on NEWUNIT specifier. */
1849 gfc_error ("UNIT specifier not allowed with NEWUNIT at %C");
1853 if (!(open->file || (open->status
1854 && gfc_wide_strncasecmp (open->status->value.character.string,
1855 "scratch", 7) == 0)))
1857 gfc_error ("NEWUNIT specifier must have FILE= "
1858 "or STATUS='scratch' at %C");
1862 else if (!open->unit)
1864 gfc_error ("OPEN statement at %C must have UNIT or NEWUNIT specified");
1868 /* Checks on the ACCESS specifier. */
1869 if (open->access && open->access->expr_type == EXPR_CONSTANT)
1871 static const char *access_f95[] = { "SEQUENTIAL", "DIRECT", NULL };
1872 static const char *access_f2003[] = { "STREAM", NULL };
1873 static const char *access_gnu[] = { "APPEND", NULL };
1875 if (!compare_to_allowed_values ("ACCESS", access_f95, access_f2003,
1877 open->access->value.character.string,
1882 /* Checks on the ACTION specifier. */
1883 if (open->action && open->action->expr_type == EXPR_CONSTANT)
1885 static const char *action[] = { "READ", "WRITE", "READWRITE", NULL };
1887 if (!compare_to_allowed_values ("ACTION", action, NULL, NULL,
1888 open->action->value.character.string,
1893 /* Checks on the ASYNCHRONOUS specifier. */
1894 if (open->asynchronous)
1896 if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: ASYNCHRONOUS= at %C "
1897 "not allowed in Fortran 95") == FAILURE)
1900 if (open->asynchronous->expr_type == EXPR_CONSTANT)
1902 static const char * asynchronous[] = { "YES", "NO", NULL };
1904 if (!compare_to_allowed_values ("ASYNCHRONOUS", asynchronous,
1905 NULL, NULL, open->asynchronous->value.character.string,
1911 /* Checks on the BLANK specifier. */
1914 if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: BLANK= at %C "
1915 "not allowed in Fortran 95") == FAILURE)
1918 if (open->blank->expr_type == EXPR_CONSTANT)
1920 static const char *blank[] = { "ZERO", "NULL", NULL };
1922 if (!compare_to_allowed_values ("BLANK", blank, NULL, NULL,
1923 open->blank->value.character.string,
1929 /* Checks on the DECIMAL specifier. */
1932 if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: DECIMAL= at %C "
1933 "not allowed in Fortran 95") == FAILURE)
1936 if (open->decimal->expr_type == EXPR_CONSTANT)
1938 static const char * decimal[] = { "COMMA", "POINT", NULL };
1940 if (!compare_to_allowed_values ("DECIMAL", decimal, NULL, NULL,
1941 open->decimal->value.character.string,
1947 /* Checks on the DELIM specifier. */
1950 if (open->delim->expr_type == EXPR_CONSTANT)
1952 static const char *delim[] = { "APOSTROPHE", "QUOTE", "NONE", NULL };
1954 if (!compare_to_allowed_values ("DELIM", delim, NULL, NULL,
1955 open->delim->value.character.string,
1961 /* Checks on the ENCODING specifier. */
1964 if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: ENCODING= at %C "
1965 "not allowed in Fortran 95") == FAILURE)
1968 if (open->encoding->expr_type == EXPR_CONSTANT)
1970 static const char * encoding[] = { "DEFAULT", "UTF-8", NULL };
1972 if (!compare_to_allowed_values ("ENCODING", encoding, NULL, NULL,
1973 open->encoding->value.character.string,
1979 /* Checks on the FORM specifier. */
1980 if (open->form && open->form->expr_type == EXPR_CONSTANT)
1982 static const char *form[] = { "FORMATTED", "UNFORMATTED", NULL };
1984 if (!compare_to_allowed_values ("FORM", form, NULL, NULL,
1985 open->form->value.character.string,
1990 /* Checks on the PAD specifier. */
1991 if (open->pad && open->pad->expr_type == EXPR_CONSTANT)
1993 static const char *pad[] = { "YES", "NO", NULL };
1995 if (!compare_to_allowed_values ("PAD", pad, NULL, NULL,
1996 open->pad->value.character.string,
2001 /* Checks on the POSITION specifier. */
2002 if (open->position && open->position->expr_type == EXPR_CONSTANT)
2004 static const char *position[] = { "ASIS", "REWIND", "APPEND", NULL };
2006 if (!compare_to_allowed_values ("POSITION", position, NULL, NULL,
2007 open->position->value.character.string,
2012 /* Checks on the ROUND specifier. */
2015 if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: ROUND= at %C "
2016 "not allowed in Fortran 95") == FAILURE)
2019 if (open->round->expr_type == EXPR_CONSTANT)
2021 static const char * round[] = { "UP", "DOWN", "ZERO", "NEAREST",
2022 "COMPATIBLE", "PROCESSOR_DEFINED",
2025 if (!compare_to_allowed_values ("ROUND", round, NULL, NULL,
2026 open->round->value.character.string,
2032 /* Checks on the SIGN specifier. */
2035 if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: SIGN= at %C "
2036 "not allowed in Fortran 95") == FAILURE)
2039 if (open->sign->expr_type == EXPR_CONSTANT)
2041 static const char * sign[] = { "PLUS", "SUPPRESS", "PROCESSOR_DEFINED",
2044 if (!compare_to_allowed_values ("SIGN", sign, NULL, NULL,
2045 open->sign->value.character.string,
2051 #define warn_or_error(...) \
2054 gfc_warning (__VA_ARGS__); \
2057 gfc_error (__VA_ARGS__); \
2062 /* Checks on the RECL specifier. */
2063 if (open->recl && open->recl->expr_type == EXPR_CONSTANT
2064 && open->recl->ts.type == BT_INTEGER
2065 && mpz_sgn (open->recl->value.integer) != 1)
2067 warn_or_error ("RECL in OPEN statement at %C must be positive");
2070 /* Checks on the STATUS specifier. */
2071 if (open->status && open->status->expr_type == EXPR_CONSTANT)
2073 static const char *status[] = { "OLD", "NEW", "SCRATCH",
2074 "REPLACE", "UNKNOWN", NULL };
2076 if (!compare_to_allowed_values ("STATUS", status, NULL, NULL,
2077 open->status->value.character.string,
2081 /* F2003, 9.4.5: If the STATUS= specifier has the value NEW or REPLACE,
2082 the FILE= specifier shall appear. */
2083 if (open->file == NULL
2084 && (gfc_wide_strncasecmp (open->status->value.character.string,
2086 || gfc_wide_strncasecmp (open->status->value.character.string,
2089 char *s = gfc_widechar_to_char (open->status->value.character.string,
2091 warn_or_error ("The STATUS specified in OPEN statement at %C is "
2092 "'%s' and no FILE specifier is present", s);
2096 /* F2003, 9.4.5: If the STATUS= specifier has the value SCRATCH,
2097 the FILE= specifier shall not appear. */
2098 if (gfc_wide_strncasecmp (open->status->value.character.string,
2099 "scratch", 7) == 0 && open->file)
2101 warn_or_error ("The STATUS specified in OPEN statement at %C "
2102 "cannot have the value SCRATCH if a FILE specifier "
2107 /* Things that are not allowed for unformatted I/O. */
2108 if (open->form && open->form->expr_type == EXPR_CONSTANT
2109 && (open->delim || open->decimal || open->encoding || open->round
2110 || open->sign || open->pad || open->blank)
2111 && gfc_wide_strncasecmp (open->form->value.character.string,
2112 "unformatted", 11) == 0)
2114 const char *spec = (open->delim ? "DELIM "
2115 : (open->pad ? "PAD " : open->blank
2118 warn_or_error ("%s specifier at %C not allowed in OPEN statement for "
2119 "unformatted I/O", spec);
2122 if (open->recl && open->access && open->access->expr_type == EXPR_CONSTANT
2123 && gfc_wide_strncasecmp (open->access->value.character.string,
2126 warn_or_error ("RECL specifier not allowed in OPEN statement at %C for "
2131 && open->access && open->access->expr_type == EXPR_CONSTANT
2132 && !(gfc_wide_strncasecmp (open->access->value.character.string,
2133 "sequential", 10) == 0
2134 || gfc_wide_strncasecmp (open->access->value.character.string,
2136 || gfc_wide_strncasecmp (open->access->value.character.string,
2139 warn_or_error ("POSITION specifier in OPEN statement at %C only allowed "
2140 "for stream or sequential ACCESS");
2143 #undef warn_or_error
2145 new_st.op = EXEC_OPEN;
2146 new_st.ext.open = open;
2150 gfc_syntax_error (ST_OPEN);
2153 gfc_free_open (open);
2158 /* Free a gfc_close structure an all its expressions. */
2161 gfc_free_close (gfc_close *close)
2166 gfc_free_expr (close->unit);
2167 gfc_free_expr (close->iomsg);
2168 gfc_free_expr (close->iostat);
2169 gfc_free_expr (close->status);
2174 /* Match elements of a CLOSE statement. */
2177 match_close_element (gfc_close *close)
2181 m = match_etag (&tag_unit, &close->unit);
2184 m = match_etag (&tag_status, &close->status);
2187 m = match_out_tag (&tag_iomsg, &close->iomsg);
2190 m = match_out_tag (&tag_iostat, &close->iostat);
2193 m = match_ltag (&tag_err, &close->err);
2201 /* Match a CLOSE statement. */
2204 gfc_match_close (void)
2210 m = gfc_match_char ('(');
2214 close = XCNEW (gfc_close);
2216 m = match_close_element (close);
2218 if (m == MATCH_ERROR)
2222 m = gfc_match_expr (&close->unit);
2225 if (m == MATCH_ERROR)
2231 if (gfc_match_char (')') == MATCH_YES)
2233 if (gfc_match_char (',') != MATCH_YES)
2236 m = match_close_element (close);
2237 if (m == MATCH_ERROR)
2243 if (gfc_match_eos () == MATCH_NO)
2246 if (gfc_pure (NULL))
2248 gfc_error ("CLOSE statement not allowed in PURE procedure at %C");
2252 if (gfc_implicit_pure (NULL))
2253 gfc_current_ns->proc_name->attr.implicit_pure = 0;
2255 warn = (close->iostat || close->err) ? true : false;
2257 /* Checks on the STATUS specifier. */
2258 if (close->status && close->status->expr_type == EXPR_CONSTANT)
2260 static const char *status[] = { "KEEP", "DELETE", NULL };
2262 if (!compare_to_allowed_values ("STATUS", status, NULL, NULL,
2263 close->status->value.character.string,
2268 new_st.op = EXEC_CLOSE;
2269 new_st.ext.close = close;
2273 gfc_syntax_error (ST_CLOSE);
2276 gfc_free_close (close);
2281 /* Resolve everything in a gfc_close structure. */
2284 gfc_resolve_close (gfc_close *close)
2286 RESOLVE_TAG (&tag_unit, close->unit);
2287 RESOLVE_TAG (&tag_iomsg, close->iomsg);
2288 RESOLVE_TAG (&tag_iostat, close->iostat);
2289 RESOLVE_TAG (&tag_status, close->status);
2291 if (gfc_reference_st_label (close->err, ST_LABEL_TARGET) == FAILURE)
2294 if (close->unit == NULL)
2296 /* Find a locus from one of the arguments to close, when UNIT is
2298 locus loc = gfc_current_locus;
2300 loc = close->status->where;
2301 else if (close->iostat)
2302 loc = close->iostat->where;
2303 else if (close->iomsg)
2304 loc = close->iomsg->where;
2305 else if (close->err)
2306 loc = close->err->where;
2308 gfc_error ("CLOSE statement at %L requires a UNIT number", &loc);
2312 if (close->unit->expr_type == EXPR_CONSTANT
2313 && close->unit->ts.type == BT_INTEGER
2314 && mpz_sgn (close->unit->value.integer) < 0)
2316 gfc_error ("UNIT number in CLOSE statement at %L must be non-negative",
2317 &close->unit->where);
2324 /* Free a gfc_filepos structure. */
2327 gfc_free_filepos (gfc_filepos *fp)
2329 gfc_free_expr (fp->unit);
2330 gfc_free_expr (fp->iomsg);
2331 gfc_free_expr (fp->iostat);
2336 /* Match elements of a REWIND, BACKSPACE, ENDFILE, or FLUSH statement. */
2339 match_file_element (gfc_filepos *fp)
2343 m = match_etag (&tag_unit, &fp->unit);
2346 m = match_out_tag (&tag_iomsg, &fp->iomsg);
2349 m = match_out_tag (&tag_iostat, &fp->iostat);
2352 m = match_ltag (&tag_err, &fp->err);
2360 /* Match the second half of the file-positioning statements, REWIND,
2361 BACKSPACE, ENDFILE, or the FLUSH statement. */
2364 match_filepos (gfc_statement st, gfc_exec_op op)
2369 fp = XCNEW (gfc_filepos);
2371 if (gfc_match_char ('(') == MATCH_NO)
2373 m = gfc_match_expr (&fp->unit);
2374 if (m == MATCH_ERROR)
2382 m = match_file_element (fp);
2383 if (m == MATCH_ERROR)
2387 m = gfc_match_expr (&fp->unit);
2388 if (m == MATCH_ERROR)
2396 if (gfc_match_char (')') == MATCH_YES)
2398 if (gfc_match_char (',') != MATCH_YES)
2401 m = match_file_element (fp);
2402 if (m == MATCH_ERROR)
2409 if (gfc_match_eos () != MATCH_YES)
2412 if (gfc_pure (NULL))
2414 gfc_error ("%s statement not allowed in PURE procedure at %C",
2415 gfc_ascii_statement (st));
2420 if (gfc_implicit_pure (NULL))
2421 gfc_current_ns->proc_name->attr.implicit_pure = 0;
2424 new_st.ext.filepos = fp;
2428 gfc_syntax_error (st);
2431 gfc_free_filepos (fp);
2437 gfc_resolve_filepos (gfc_filepos *fp)
2439 RESOLVE_TAG (&tag_unit, fp->unit);
2440 RESOLVE_TAG (&tag_iostat, fp->iostat);
2441 RESOLVE_TAG (&tag_iomsg, fp->iomsg);
2442 if (gfc_reference_st_label (fp->err, ST_LABEL_TARGET) == FAILURE)
2445 if (fp->unit->expr_type == EXPR_CONSTANT
2446 && fp->unit->ts.type == BT_INTEGER
2447 && mpz_sgn (fp->unit->value.integer) < 0)
2449 gfc_error ("UNIT number in statement at %L must be non-negative",
2457 /* Match the file positioning statements: ENDFILE, BACKSPACE, REWIND,
2458 and the FLUSH statement. */
2461 gfc_match_endfile (void)
2463 return match_filepos (ST_END_FILE, EXEC_ENDFILE);
2467 gfc_match_backspace (void)
2469 return match_filepos (ST_BACKSPACE, EXEC_BACKSPACE);
2473 gfc_match_rewind (void)
2475 return match_filepos (ST_REWIND, EXEC_REWIND);
2479 gfc_match_flush (void)
2481 if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: FLUSH statement at %C")
2485 return match_filepos (ST_FLUSH, EXEC_FLUSH);
2488 /******************** Data Transfer Statements *********************/
2490 /* Return a default unit number. */
2493 default_unit (io_kind k)
2502 return gfc_get_int_expr (gfc_default_integer_kind, NULL, unit);
2506 /* Match a unit specification for a data transfer statement. */
2509 match_dt_unit (io_kind k, gfc_dt *dt)
2513 if (gfc_match_char ('*') == MATCH_YES)
2515 if (dt->io_unit != NULL)
2518 dt->io_unit = default_unit (k);
2522 if (gfc_match_expr (&e) == MATCH_YES)
2524 if (dt->io_unit != NULL)
2537 gfc_error ("Duplicate UNIT specification at %C");
2542 /* Match a format specification. */
2545 match_dt_format (gfc_dt *dt)
2549 gfc_st_label *label;
2552 where = gfc_current_locus;
2554 if (gfc_match_char ('*') == MATCH_YES)
2556 if (dt->format_expr != NULL || dt->format_label != NULL)
2559 dt->format_label = &format_asterisk;
2563 if ((m = gfc_match_st_label (&label)) == MATCH_YES)
2567 /* Need to check if the format label is actually either an operand
2568 to a user-defined operator or is a kind type parameter. That is,
2569 print 2.ip.8 ! .ip. is a user-defined operator return CHARACTER.
2570 print 1_'(I0)', i ! 1_'(I0)' is a default character string. */
2572 gfc_gobble_whitespace ();
2573 c = gfc_peek_ascii_char ();
2574 if (c == '.' || c == '_')
2575 gfc_current_locus = where;
2578 if (dt->format_expr != NULL || dt->format_label != NULL)
2580 gfc_free_st_label (label);
2584 if (gfc_reference_st_label (label, ST_LABEL_FORMAT) == FAILURE)
2587 dt->format_label = label;
2591 else if (m == MATCH_ERROR)
2592 /* The label was zero or too large. Emit the correct diagnosis. */
2595 if (gfc_match_expr (&e) == MATCH_YES)
2597 if (dt->format_expr != NULL || dt->format_label != NULL)
2602 dt->format_expr = e;
2606 gfc_current_locus = where; /* The only case where we have to restore */
2611 gfc_error ("Duplicate format specification at %C");
2616 /* Traverse a namelist that is part of a READ statement to make sure
2617 that none of the variables in the namelist are INTENT(IN). Returns
2618 nonzero if we find such a variable. */
2621 check_namelist (gfc_symbol *sym)
2625 for (p = sym->namelist; p; p = p->next)
2626 if (p->sym->attr.intent == INTENT_IN)
2628 gfc_error ("Symbol '%s' in namelist '%s' is INTENT(IN) at %C",
2629 p->sym->name, sym->name);
2637 /* Match a single data transfer element. */
2640 match_dt_element (io_kind k, gfc_dt *dt)
2642 char name[GFC_MAX_SYMBOL_LEN + 1];
2646 if (gfc_match (" unit =") == MATCH_YES)
2648 m = match_dt_unit (k, dt);
2653 if (gfc_match (" fmt =") == MATCH_YES)
2655 m = match_dt_format (dt);
2660 if (gfc_match (" nml = %n", name) == MATCH_YES)
2662 if (dt->namelist != NULL)
2664 gfc_error ("Duplicate NML specification at %C");
2668 if (gfc_find_symbol (name, NULL, 1, &sym))
2671 if (sym == NULL || sym->attr.flavor != FL_NAMELIST)
2673 gfc_error ("Symbol '%s' at %C must be a NAMELIST group name",
2674 sym != NULL ? sym->name : name);
2679 if (k == M_READ && check_namelist (sym))
2685 m = match_etag (&tag_e_async, &dt->asynchronous);
2688 m = match_etag (&tag_e_blank, &dt->blank);
2691 m = match_etag (&tag_e_delim, &dt->delim);
2694 m = match_etag (&tag_e_pad, &dt->pad);
2697 m = match_etag (&tag_e_sign, &dt->sign);
2700 m = match_etag (&tag_e_round, &dt->round);
2703 m = match_out_tag (&tag_id, &dt->id);
2706 m = match_etag (&tag_e_decimal, &dt->decimal);
2709 m = match_etag (&tag_rec, &dt->rec);
2712 m = match_etag (&tag_spos, &dt->pos);
2715 m = match_out_tag (&tag_iomsg, &dt->iomsg);
2718 m = match_out_tag (&tag_iostat, &dt->iostat);
2721 m = match_ltag (&tag_err, &dt->err);
2723 dt->err_where = gfc_current_locus;
2726 m = match_etag (&tag_advance, &dt->advance);
2729 m = match_out_tag (&tag_size, &dt->size);
2733 m = match_ltag (&tag_end, &dt->end);
2738 gfc_error ("END tag at %C not allowed in output statement");
2741 dt->end_where = gfc_current_locus;
2746 m = match_ltag (&tag_eor, &dt->eor);
2748 dt->eor_where = gfc_current_locus;
2756 /* Free a data transfer structure and everything below it. */
2759 gfc_free_dt (gfc_dt *dt)
2764 gfc_free_expr (dt->io_unit);
2765 gfc_free_expr (dt->format_expr);
2766 gfc_free_expr (dt->rec);
2767 gfc_free_expr (dt->advance);
2768 gfc_free_expr (dt->iomsg);
2769 gfc_free_expr (dt->iostat);
2770 gfc_free_expr (dt->size);
2771 gfc_free_expr (dt->pad);
2772 gfc_free_expr (dt->delim);
2773 gfc_free_expr (dt->sign);
2774 gfc_free_expr (dt->round);
2775 gfc_free_expr (dt->blank);
2776 gfc_free_expr (dt->decimal);
2777 gfc_free_expr (dt->pos);
2778 gfc_free_expr (dt->dt_io_kind);
2779 /* dt->extra_comma is a link to dt_io_kind if it is set. */
2784 /* Resolve everything in a gfc_dt structure. */
2787 gfc_resolve_dt (gfc_dt *dt, locus *loc)
2792 /* This is set in any case. */
2793 gcc_assert (dt->dt_io_kind);
2794 k = dt->dt_io_kind->value.iokind;
2796 RESOLVE_TAG (&tag_format, dt->format_expr);
2797 RESOLVE_TAG (&tag_rec, dt->rec);
2798 RESOLVE_TAG (&tag_spos, dt->pos);
2799 RESOLVE_TAG (&tag_advance, dt->advance);
2800 RESOLVE_TAG (&tag_id, dt->id);
2801 RESOLVE_TAG (&tag_iomsg, dt->iomsg);
2802 RESOLVE_TAG (&tag_iostat, dt->iostat);
2803 RESOLVE_TAG (&tag_size, dt->size);
2804 RESOLVE_TAG (&tag_e_pad, dt->pad);
2805 RESOLVE_TAG (&tag_e_delim, dt->delim);
2806 RESOLVE_TAG (&tag_e_sign, dt->sign);
2807 RESOLVE_TAG (&tag_e_round, dt->round);
2808 RESOLVE_TAG (&tag_e_blank, dt->blank);
2809 RESOLVE_TAG (&tag_e_decimal, dt->decimal);
2810 RESOLVE_TAG (&tag_e_async, dt->asynchronous);
2815 gfc_error ("UNIT not specified at %L", loc);
2819 if (gfc_resolve_expr (e) == SUCCESS
2820 && (e->ts.type != BT_INTEGER
2821 && (e->ts.type != BT_CHARACTER || e->expr_type != EXPR_VARIABLE)))
2823 /* If there is no extra comma signifying the "format" form of the IO
2824 statement, then this must be an error. */
2825 if (!dt->extra_comma)
2827 gfc_error ("UNIT specification at %L must be an INTEGER expression "
2828 "or a CHARACTER variable", &e->where);
2833 /* At this point, we have an extra comma. If io_unit has arrived as
2834 type character, we assume its really the "format" form of the I/O
2835 statement. We set the io_unit to the default unit and format to
2836 the character expression. See F95 Standard section 9.4. */
2837 if (e->ts.type == BT_CHARACTER && (k == M_READ || k == M_PRINT))
2839 dt->format_expr = dt->io_unit;
2840 dt->io_unit = default_unit (k);
2842 /* Nullify this pointer now so that a warning/error is not
2843 triggered below for the "Extension". */
2844 dt->extra_comma = NULL;
2849 gfc_error ("Invalid form of WRITE statement at %L, UNIT required",
2850 &dt->extra_comma->where);
2856 if (e->ts.type == BT_CHARACTER)
2858 if (gfc_has_vector_index (e))
2860 gfc_error ("Internal unit with vector subscript at %L", &e->where);
2864 /* If we are writing, make sure the internal unit can be changed. */
2865 gcc_assert (k != M_PRINT);
2867 && gfc_check_vardef_context (e, false, false,
2868 _("internal unit in WRITE")) == FAILURE)
2872 if (e->rank && e->ts.type != BT_CHARACTER)
2874 gfc_error ("External IO UNIT cannot be an array at %L", &e->where);
2878 if (e->expr_type == EXPR_CONSTANT && e->ts.type == BT_INTEGER
2879 && mpz_sgn (e->value.integer) < 0)
2881 gfc_error ("UNIT number in statement at %L must be non-negative",
2886 /* If we are reading and have a namelist, check that all namelist symbols
2887 can appear in a variable definition context. */
2888 if (k == M_READ && dt->namelist)
2891 for (n = dt->namelist->namelist; n; n = n->next)
2896 e = gfc_get_variable_expr (gfc_find_sym_in_symtree (n->sym));
2897 t = gfc_check_vardef_context (e, false, false, NULL);
2902 gfc_error ("NAMELIST '%s' in READ statement at %L contains"
2903 " the symbol '%s' which may not appear in a"
2904 " variable definition context",
2905 dt->namelist->name, loc, n->sym->name);
2912 && gfc_notify_std (GFC_STD_GNU, "Extension: Comma before i/o "
2913 "item list at %L", &dt->extra_comma->where) == FAILURE)
2918 if (gfc_reference_st_label (dt->err, ST_LABEL_TARGET) == FAILURE)
2920 if (dt->err->defined == ST_LABEL_UNKNOWN)
2922 gfc_error ("ERR tag label %d at %L not defined",
2923 dt->err->value, &dt->err_where);
2930 if (gfc_reference_st_label (dt->end, ST_LABEL_TARGET) == FAILURE)
2932 if (dt->end->defined == ST_LABEL_UNKNOWN)
2934 gfc_error ("END tag label %d at %L not defined",
2935 dt->end->value, &dt->end_where);
2942 if (gfc_reference_st_label (dt->eor, ST_LABEL_TARGET) == FAILURE)
2944 if (dt->eor->defined == ST_LABEL_UNKNOWN)
2946 gfc_error ("EOR tag label %d at %L not defined",
2947 dt->eor->value, &dt->eor_where);
2952 /* Check the format label actually exists. */
2953 if (dt->format_label && dt->format_label != &format_asterisk
2954 && dt->format_label->defined == ST_LABEL_UNKNOWN)
2956 gfc_error ("FORMAT label %d at %L not defined", dt->format_label->value,
2957 &dt->format_label->where);
2965 /* Given an io_kind, return its name. */
2968 io_kind_name (io_kind k)
2987 gfc_internal_error ("io_kind_name(): bad I/O-kind");
2994 /* Match an IO iteration statement of the form:
2996 ( [<IO element> ,] <IO element>, I = <expr>, <expr> [, <expr> ] )
2998 which is equivalent to a single IO element. This function is
2999 mutually recursive with match_io_element(). */
3001 static match match_io_element (io_kind, gfc_code **);
3004 match_io_iterator (io_kind k, gfc_code **result)
3006 gfc_code *head, *tail, *new_code;
3014 old_loc = gfc_current_locus;
3016 if (gfc_match_char ('(') != MATCH_YES)
3019 m = match_io_element (k, &head);
3022 if (m != MATCH_YES || gfc_match_char (',') != MATCH_YES)
3028 /* Can't be anything but an IO iterator. Build a list. */
3029 iter = gfc_get_iterator ();
3033 m = gfc_match_iterator (iter, 0);
3034 if (m == MATCH_ERROR)
3038 gfc_check_do_variable (iter->var->symtree);
3042 m = match_io_element (k, &new_code);
3043 if (m == MATCH_ERROR)
3052 tail = gfc_append_code (tail, new_code);
3054 if (gfc_match_char (',') != MATCH_YES)
3063 if (gfc_match_char (')') != MATCH_YES)
3066 new_code = gfc_get_code ();
3067 new_code->op = EXEC_DO;
3068 new_code->ext.iterator = iter;
3070 new_code->block = gfc_get_code ();
3071 new_code->block->op = EXEC_DO;
3072 new_code->block->next = head;
3078 gfc_error ("Syntax error in I/O iterator at %C");
3082 gfc_free_iterator (iter, 1);
3083 gfc_free_statements (head);
3084 gfc_current_locus = old_loc;
3089 /* Match a single element of an IO list, which is either a single
3090 expression or an IO Iterator. */
3093 match_io_element (io_kind k, gfc_code **cpp)
3101 m = match_io_iterator (k, cpp);
3107 m = gfc_match_variable (&expr, 0);
3109 gfc_error ("Expected variable in READ statement at %C");
3113 m = gfc_match_expr (&expr);
3115 gfc_error ("Expected expression in %s statement at %C",
3119 if (m == MATCH_YES && k == M_READ && gfc_check_do_variable (expr->symtree))
3124 gfc_free_expr (expr);
3128 cp = gfc_get_code ();
3129 cp->op = EXEC_TRANSFER;
3132 cp->ext.dt = current_dt;
3139 /* Match an I/O list, building gfc_code structures as we go. */
3142 match_io_list (io_kind k, gfc_code **head_p)
3144 gfc_code *head, *tail, *new_code;
3147 *head_p = head = tail = NULL;
3148 if (gfc_match_eos () == MATCH_YES)
3153 m = match_io_element (k, &new_code);
3154 if (m == MATCH_ERROR)
3159 tail = gfc_append_code (tail, new_code);
3163 if (gfc_match_eos () == MATCH_YES)
3165 if (gfc_match_char (',') != MATCH_YES)
3173 gfc_error ("Syntax error in %s statement at %C", io_kind_name (k));
3176 gfc_free_statements (head);
3181 /* Attach the data transfer end node. */
3184 terminate_io (gfc_code *io_code)
3188 if (io_code == NULL)
3189 io_code = new_st.block;
3191 c = gfc_get_code ();
3192 c->op = EXEC_DT_END;
3194 /* Point to structure that is already there */
3195 c->ext.dt = new_st.ext.dt;
3196 gfc_append_code (io_code, c);
3200 /* Check the constraints for a data transfer statement. The majority of the
3201 constraints appearing in 9.4 of the standard appear here. Some are handled
3202 in resolve_tag and others in gfc_resolve_dt. */
3205 check_io_constraints (io_kind k, gfc_dt *dt, gfc_code *io_code,
3208 #define io_constraint(condition,msg,arg)\
3211 gfc_error(msg,arg);\
3217 gfc_symbol *sym = NULL;
3218 bool warn, unformatted;
3220 warn = (dt->err || dt->iostat) ? true : false;
3221 unformatted = dt->format_expr == NULL && dt->format_label == NULL
3222 && dt->namelist == NULL;
3227 if (expr && expr->expr_type == EXPR_VARIABLE
3228 && expr->ts.type == BT_CHARACTER)
3230 sym = expr->symtree->n.sym;
3232 io_constraint (k == M_WRITE && sym->attr.intent == INTENT_IN,
3233 "Internal file at %L must not be INTENT(IN)",
3236 io_constraint (gfc_has_vector_index (dt->io_unit),
3237 "Internal file incompatible with vector subscript at %L",
3240 io_constraint (dt->rec != NULL,
3241 "REC tag at %L is incompatible with internal file",
3244 io_constraint (dt->pos != NULL,
3245 "POS tag at %L is incompatible with internal file",
3248 io_constraint (unformatted,
3249 "Unformatted I/O not allowed with internal unit at %L",
3250 &dt->io_unit->where);
3252 io_constraint (dt->asynchronous != NULL,
3253 "ASYNCHRONOUS tag at %L not allowed with internal file",
3254 &dt->asynchronous->where);
3256 if (dt->namelist != NULL)
3258 if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: Internal file "
3259 "at %L with namelist", &expr->where)
3264 io_constraint (dt->advance != NULL,
3265 "ADVANCE tag at %L is incompatible with internal file",
3266 &dt->advance->where);
3269 if (expr && expr->ts.type != BT_CHARACTER)
3272 io_constraint (gfc_pure (NULL) && (k == M_READ || k == M_WRITE),
3273 "IO UNIT in %s statement at %C must be "
3274 "an internal file in a PURE procedure",
3277 if (gfc_implicit_pure (NULL) && (k == M_READ || k == M_WRITE))
3278 gfc_current_ns->proc_name->attr.implicit_pure = 0;
3284 io_constraint (dt->end, "END tag not allowed with output at %L",
3287 io_constraint (dt->eor, "EOR tag not allowed with output at %L",
3290 io_constraint (dt->blank, "BLANK= specifier not allowed with output at %L",
3293 io_constraint (dt->pad, "PAD= specifier not allowed with output at %L",
3296 io_constraint (dt->size, "SIZE= specifier not allowed with output at %L",
3301 io_constraint (dt->size && dt->advance == NULL,
3302 "SIZE tag at %L requires an ADVANCE tag",
3305 io_constraint (dt->eor && dt->advance == NULL,
3306 "EOR tag at %L requires an ADVANCE tag",
3310 if (dt->asynchronous)
3312 static const char * asynchronous[] = { "YES", "NO", NULL };
3314 if (gfc_reduce_init_expr (dt->asynchronous) != SUCCESS)
3316 gfc_error ("ASYNCHRONOUS= specifier at %L must be an initialization "
3317 "expression", &dt->asynchronous->where);
3321 if (!compare_to_allowed_values
3322 ("ASYNCHRONOUS", asynchronous, NULL, NULL,
3323 dt->asynchronous->value.character.string,
3324 io_kind_name (k), warn))
3332 || gfc_wide_strlen (dt->asynchronous->value.character.string) != 3
3333 || gfc_wide_strncasecmp (dt->asynchronous->value.character.string,
3335 io_constraint (not_yes,
3336 "ID= specifier at %L must be with ASYNCHRONOUS='yes' "
3337 "specifier", &dt->id->where);
3342 if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: DECIMAL= at %C "
3343 "not allowed in Fortran 95") == FAILURE)
3346 if (dt->decimal->expr_type == EXPR_CONSTANT)
3348 static const char * decimal[] = { "COMMA", "POINT", NULL };
3350 if (!compare_to_allowed_values ("DECIMAL", decimal, NULL, NULL,
3351 dt->decimal->value.character.string,
3352 io_kind_name (k), warn))
3355 io_constraint (unformatted,
3356 "the DECIMAL= specifier at %L must be with an "
3357 "explicit format expression", &dt->decimal->where);
3363 if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: BLANK= at %C "
3364 "not allowed in Fortran 95") == FAILURE)
3367 if (dt->blank->expr_type == EXPR_CONSTANT)
3369 static const char * blank[] = { "NULL", "ZERO", NULL };
3371 if (!compare_to_allowed_values ("BLANK", blank, NULL, NULL,
3372 dt->blank->value.character.string,
3373 io_kind_name (k), warn))
3376 io_constraint (unformatted,
3377 "the BLANK= specifier at %L must be with an "
3378 "explicit format expression", &dt->blank->where);
3384 if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: PAD= at %C "
3385 "not allowed in Fortran 95") == FAILURE)
3388 if (dt->pad->expr_type == EXPR_CONSTANT)
3390 static const char * pad[] = { "YES", "NO", NULL };
3392 if (!compare_to_allowed_values ("PAD", pad, NULL, NULL,
3393 dt->pad->value.character.string,
3394 io_kind_name (k), warn))
3397 io_constraint (unformatted,
3398 "the PAD= specifier at %L must be with an "
3399 "explicit format expression", &dt->pad->where);
3405 if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: ROUND= at %C "
3406 "not allowed in Fortran 95") == FAILURE)
3409 if (dt->round->expr_type == EXPR_CONSTANT)
3411 static const char * round[] = { "UP", "DOWN", "ZERO", "NEAREST",
3412 "COMPATIBLE", "PROCESSOR_DEFINED",
3415 if (!compare_to_allowed_values ("ROUND", round, NULL, NULL,
3416 dt->round->value.character.string,
3417 io_kind_name (k), warn))
3424 /* When implemented, change the following to use gfc_notify_std F2003.
3425 if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: SIGN= at %C "
3426 "not allowed in Fortran 95") == FAILURE)
3427 return MATCH_ERROR; */
3428 if (dt->sign->expr_type == EXPR_CONSTANT)
3430 static const char * sign[] = { "PLUS", "SUPPRESS", "PROCESSOR_DEFINED",
3433 if (!compare_to_allowed_values ("SIGN", sign, NULL, NULL,
3434 dt->sign->value.character.string,
3435 io_kind_name (k), warn))
3438 io_constraint (unformatted,
3439 "SIGN= specifier at %L must be with an "
3440 "explicit format expression", &dt->sign->where);
3442 io_constraint (k == M_READ,
3443 "SIGN= specifier at %L not allowed in a "
3444 "READ statement", &dt->sign->where);
3450 if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: DELIM= at %C "
3451 "not allowed in Fortran 95") == FAILURE)
3454 if (dt->delim->expr_type == EXPR_CONSTANT)
3456 static const char *delim[] = { "APOSTROPHE", "QUOTE", "NONE", NULL };
3458 if (!compare_to_allowed_values ("DELIM", delim, NULL, NULL,
3459 dt->delim->value.character.string,
3460 io_kind_name (k), warn))
3463 io_constraint (k == M_READ,
3464 "DELIM= specifier at %L not allowed in a "
3465 "READ statement", &dt->delim->where);
3467 io_constraint (dt->format_label != &format_asterisk
3468 && dt->namelist == NULL,
3469 "DELIM= specifier at %L must have FMT=*",
3472 io_constraint (unformatted && dt->namelist == NULL,
3473 "DELIM= specifier at %L must be with FMT=* or "
3474 "NML= specifier ", &dt->delim->where);
3480 io_constraint (io_code && dt->namelist,
3481 "NAMELIST cannot be followed by IO-list at %L",
3484 io_constraint (dt->format_expr,
3485 "IO spec-list cannot contain both NAMELIST group name "
3486 "and format specification at %L",
3487 &dt->format_expr->where);
3489 io_constraint (dt->format_label,
3490 "IO spec-list cannot contain both NAMELIST group name "
3491 "and format label at %L", spec_end);
3493 io_constraint (dt->rec,
3494 "NAMELIST IO is not allowed with a REC= specifier "
3495 "at %L", &dt->rec->where);
3497 io_constraint (dt->advance,
3498 "NAMELIST IO is not allowed with a ADVANCE= specifier "
3499 "at %L", &dt->advance->where);
3504 io_constraint (dt->end,
3505 "An END tag is not allowed with a "
3506 "REC= specifier at %L", &dt->end_where);
3508 io_constraint (dt->format_label == &format_asterisk,
3509 "FMT=* is not allowed with a REC= specifier "
3512 io_constraint (dt->pos,
3513 "POS= is not allowed with REC= specifier "
3514 "at %L", &dt->pos->where);
3519 int not_yes, not_no;
3522 io_constraint (dt->format_label == &format_asterisk,
3523 "List directed format(*) is not allowed with a "
3524 "ADVANCE= specifier at %L.", &expr->where);
3526 io_constraint (unformatted,
3527 "the ADVANCE= specifier at %L must appear with an "
3528 "explicit format expression", &expr->where);
3530 if (expr->expr_type == EXPR_CONSTANT && expr->ts.type == BT_CHARACTER)
3532 const gfc_char_t *advance = expr->value.character.string;
3533 not_no = gfc_wide_strlen (advance) != 2
3534 || gfc_wide_strncasecmp (advance, "no", 2) != 0;
3535 not_yes = gfc_wide_strlen (advance) != 3
3536 || gfc_wide_strncasecmp (advance, "yes", 3) != 0;
3544 io_constraint (not_no && not_yes,
3545 "ADVANCE= specifier at %L must have value = "
3546 "YES or NO.", &expr->where);
3548 io_constraint (dt->size && not_no && k == M_READ,
3549 "SIZE tag at %L requires an ADVANCE = 'NO'",
3552 io_constraint (dt->eor && not_no && k == M_READ,
3553 "EOR tag at %L requires an ADVANCE = 'NO'",
3557 expr = dt->format_expr;
3558 if (gfc_simplify_expr (expr, 0) == FAILURE
3559 || check_format_string (expr, k == M_READ) == FAILURE)
3564 #undef io_constraint
3567 /* Match a READ, WRITE or PRINT statement. */
3570 match_io (io_kind k)
3572 char name[GFC_MAX_SYMBOL_LEN + 1];
3581 where = gfc_current_locus;
3583 current_dt = dt = XCNEW (gfc_dt);
3584 m = gfc_match_char ('(');
3587 where = gfc_current_locus;
3590 else if (k == M_PRINT)
3592 /* Treat the non-standard case of PRINT namelist. */
3593 if ((gfc_current_form == FORM_FIXED || gfc_peek_ascii_char () == ' ')
3594 && gfc_match_name (name) == MATCH_YES)
3596 gfc_find_symbol (name, NULL, 1, &sym);
3597 if (sym && sym->attr.flavor == FL_NAMELIST)
3599 if (gfc_notify_std (GFC_STD_GNU, "PRINT namelist at "
3600 "%C is an extension") == FAILURE)
3606 dt->io_unit = default_unit (k);
3611 gfc_current_locus = where;
3615 if (gfc_current_form == FORM_FREE)
3617 char c = gfc_peek_ascii_char ();
3618 if (c != ' ' && c != '*' && c != '\'' && c != '"')
3625 m = match_dt_format (dt);
3626 if (m == MATCH_ERROR)
3632 dt->io_unit = default_unit (k);
3637 /* Before issuing an error for a malformed 'print (1,*)' type of
3638 error, check for a default-char-expr of the form ('(I0)'). */
3639 if (k == M_PRINT && m == MATCH_YES)
3641 /* Reset current locus to get the initial '(' in an expression. */
3642 gfc_current_locus = where;
3643 dt->format_expr = NULL;
3644 m = match_dt_format (dt);
3646 if (m == MATCH_ERROR)
3648 if (m == MATCH_NO || dt->format_expr == NULL)
3652 dt->io_unit = default_unit (k);
3657 /* Match a control list */
3658 if (match_dt_element (k, dt) == MATCH_YES)
3660 if (match_dt_unit (k, dt) != MATCH_YES)
3663 if (gfc_match_char (')') == MATCH_YES)
3665 if (gfc_match_char (',') != MATCH_YES)
3668 m = match_dt_element (k, dt);
3671 if (m == MATCH_ERROR)
3674 m = match_dt_format (dt);
3677 if (m == MATCH_ERROR)
3680 where = gfc_current_locus;
3682 m = gfc_match_name (name);
3685 gfc_find_symbol (name, NULL, 1, &sym);
3686 if (sym && sym->attr.flavor == FL_NAMELIST)
3689 if (k == M_READ && check_namelist (sym))
3698 gfc_current_locus = where;
3700 goto loop; /* No matches, try regular elements */
3703 if (gfc_match_char (')') == MATCH_YES)
3705 if (gfc_match_char (',') != MATCH_YES)
3711 m = match_dt_element (k, dt);
3714 if (m == MATCH_ERROR)
3717 if (gfc_match_char (')') == MATCH_YES)
3719 if (gfc_match_char (',') != MATCH_YES)
3725 /* Used in check_io_constraints, where no locus is available. */
3726 spec_end = gfc_current_locus;
3728 /* Save the IO kind for later use. */
3729 dt->dt_io_kind = gfc_get_iokind_expr (&gfc_current_locus, k);
3731 /* Optional leading comma (non-standard). We use a gfc_expr structure here
3732 to save the locus. This is used later when resolving transfer statements
3733 that might have a format expression without unit number. */
3734 if (!comma_flag && gfc_match_char (',') == MATCH_YES)
3735 dt->extra_comma = dt->dt_io_kind;
3738 if (gfc_match_eos () != MATCH_YES)
3740 if (comma_flag && gfc_match_char (',') != MATCH_YES)
3742 gfc_error ("Expected comma in I/O list at %C");
3747 m = match_io_list (k, &io_code);
3748 if (m == MATCH_ERROR)
3754 /* A full IO statement has been matched. Check the constraints. spec_end is
3755 supplied for cases where no locus is supplied. */
3756 m = check_io_constraints (k, dt, io_code, &spec_end);
3758 if (m == MATCH_ERROR)
3761 new_st.op = (k == M_READ) ? EXEC_READ : EXEC_WRITE;
3763 new_st.block = gfc_get_code ();
3764 new_st.block->op = new_st.op;
3765 new_st.block->next = io_code;
3767 terminate_io (io_code);
3772 gfc_error ("Syntax error in %s statement at %C", io_kind_name (k));
3782 gfc_match_read (void)
3784 return match_io (M_READ);
3789 gfc_match_write (void)
3791 return match_io (M_WRITE);
3796 gfc_match_print (void)
3800 m = match_io (M_PRINT);
3804 if (gfc_pure (NULL))
3806 gfc_error ("PRINT statement at %C not allowed within PURE procedure");
3810 if (gfc_implicit_pure (NULL))
3811 gfc_current_ns->proc_name->attr.implicit_pure = 0;
3817 /* Free a gfc_inquire structure. */
3820 gfc_free_inquire (gfc_inquire *inquire)
3823 if (inquire == NULL)
3826 gfc_free_expr (inquire->unit);
3827 gfc_free_expr (inquire->file);
3828 gfc_free_expr (inquire->iomsg);
3829 gfc_free_expr (inquire->iostat);
3830 gfc_free_expr (inquire->exist);
3831 gfc_free_expr (inquire->opened);
3832 gfc_free_expr (inquire->number);
3833 gfc_free_expr (inquire->named);
3834 gfc_free_expr (inquire->name);
3835 gfc_free_expr (inquire->access);
3836 gfc_free_expr (inquire->sequential);
3837 gfc_free_expr (inquire->direct);
3838 gfc_free_expr (inquire->form);
3839 gfc_free_expr (inquire->formatted);
3840 gfc_free_expr (inquire->unformatted);
3841 gfc_free_expr (inquire->recl);
3842 gfc_free_expr (inquire->nextrec);
3843 gfc_free_expr (inquire->blank);
3844 gfc_free_expr (inquire->position);
3845 gfc_free_expr (inquire->action);
3846 gfc_free_expr (inquire->read);
3847 gfc_free_expr (inquire->write);
3848 gfc_free_expr (inquire->readwrite);
3849 gfc_free_expr (inquire->delim);
3850 gfc_free_expr (inquire->encoding);
3851 gfc_free_expr (inquire->pad);
3852 gfc_free_expr (inquire->iolength);
3853 gfc_free_expr (inquire->convert);
3854 gfc_free_expr (inquire->strm_pos);
3855 gfc_free_expr (inquire->asynchronous);
3856 gfc_free_expr (inquire->decimal);
3857 gfc_free_expr (inquire->pending);
3858 gfc_free_expr (inquire->id);
3859 gfc_free_expr (inquire->sign);
3860 gfc_free_expr (inquire->size);
3861 gfc_free_expr (inquire->round);
3866 /* Match an element of an INQUIRE statement. */
3868 #define RETM if (m != MATCH_NO) return m;
3871 match_inquire_element (gfc_inquire *inquire)
3875 m = match_etag (&tag_unit, &inquire->unit);
3876 RETM m = match_etag (&tag_file, &inquire->file);
3877 RETM m = match_ltag (&tag_err, &inquire->err);
3878 RETM m = match_out_tag (&tag_iomsg, &inquire->iomsg);
3879 RETM m = match_out_tag (&tag_iostat, &inquire->iostat);
3880 RETM m = match_vtag (&tag_exist, &inquire->exist);
3881 RETM m = match_vtag (&tag_opened, &inquire->opened);
3882 RETM m = match_vtag (&tag_named, &inquire->named);
3883 RETM m = match_vtag (&tag_name, &inquire->name);
3884 RETM m = match_out_tag (&tag_number, &inquire->number);
3885 RETM m = match_vtag (&tag_s_access, &inquire->access);
3886 RETM m = match_vtag (&tag_sequential, &inquire->sequential);
3887 RETM m = match_vtag (&tag_direct, &inquire->direct);
3888 RETM m = match_vtag (&tag_s_form, &inquire->form);
3889 RETM m = match_vtag (&tag_formatted, &inquire->formatted);
3890 RETM m = match_vtag (&tag_unformatted, &inquire->unformatted);
3891 RETM m = match_out_tag (&tag_s_recl, &inquire->recl);
3892 RETM m = match_out_tag (&tag_nextrec, &inquire->nextrec);
3893 RETM m = match_vtag (&tag_s_blank, &inquire->blank);
3894 RETM m = match_vtag (&tag_s_position, &inquire->position);
3895 RETM m = match_vtag (&tag_s_action, &inquire->action);
3896 RETM m = match_vtag (&tag_read, &inquire->read);
3897 RETM m = match_vtag (&tag_write, &inquire->write);
3898 RETM m = match_vtag (&tag_readwrite, &inquire->readwrite);
3899 RETM m = match_vtag (&tag_s_async, &inquire->asynchronous);
3900 RETM m = match_vtag (&tag_s_delim, &inquire->delim);
3901 RETM m = match_vtag (&tag_s_decimal, &inquire->decimal);
3902 RETM m = match_vtag (&tag_size, &inquire->size);
3903 RETM m = match_vtag (&tag_s_encoding, &inquire->encoding);
3904 RETM m = match_vtag (&tag_s_round, &inquire->round);
3905 RETM m = match_vtag (&tag_s_sign, &inquire->sign);
3906 RETM m = match_vtag (&tag_s_pad, &inquire->pad);
3907 RETM m = match_vtag (&tag_iolength, &inquire->iolength);
3908 RETM m = match_vtag (&tag_convert, &inquire->convert);
3909 RETM m = match_out_tag (&tag_strm_out, &inquire->strm_pos);
3910 RETM m = match_vtag (&tag_pending, &inquire->pending);
3911 RETM m = match_vtag (&tag_id, &inquire->id);
3912 RETM return MATCH_NO;
3919 gfc_match_inquire (void)
3921 gfc_inquire *inquire;
3926 m = gfc_match_char ('(');
3930 inquire = XCNEW (gfc_inquire);
3932 loc = gfc_current_locus;
3934 m = match_inquire_element (inquire);
3935 if (m == MATCH_ERROR)
3939 m = gfc_match_expr (&inquire->unit);
3940 if (m == MATCH_ERROR)
3946 /* See if we have the IOLENGTH form of the inquire statement. */
3947 if (inquire->iolength != NULL)
3949 if (gfc_match_char (')') != MATCH_YES)
3952 m = match_io_list (M_INQUIRE, &code);
3953 if (m == MATCH_ERROR)
3958 new_st.op = EXEC_IOLENGTH;
3959 new_st.expr1 = inquire->iolength;
3960 new_st.ext.inquire = inquire;
3962 if (gfc_pure (NULL))
3964 gfc_free_statements (code);
3965 gfc_error ("INQUIRE statement not allowed in PURE procedure at %C");
3969 if (gfc_implicit_pure (NULL))
3970 gfc_current_ns->proc_name->attr.implicit_pure = 0;
3972 new_st.block = gfc_get_code ();
3973 new_st.block->op = EXEC_IOLENGTH;
3974 terminate_io (code);
3975 new_st.block->next = code;
3979 /* At this point, we have the non-IOLENGTH inquire statement. */
3982 if (gfc_match_char (')') == MATCH_YES)
3984 if (gfc_match_char (',') != MATCH_YES)
3987 m = match_inquire_element (inquire);
3988 if (m == MATCH_ERROR)
3993 if (inquire->iolength != NULL)
3995 gfc_error ("IOLENGTH tag invalid in INQUIRE statement at %C");
4000 if (gfc_match_eos () != MATCH_YES)
4003 if (inquire->unit != NULL && inquire->file != NULL)
4005 gfc_error ("INQUIRE statement at %L cannot contain both FILE and "
4006 "UNIT specifiers", &loc);
4010 if (inquire->unit == NULL && inquire->file == NULL)
4012 gfc_error ("INQUIRE statement at %L requires either FILE or "
4013 "UNIT specifier", &loc);
4017 if (gfc_pure (NULL))
4019 gfc_error ("INQUIRE statement not allowed in PURE procedure at %C");
4023 if (gfc_implicit_pure (NULL))
4024 gfc_current_ns->proc_name->attr.implicit_pure = 0;
4026 if (inquire->id != NULL && inquire->pending == NULL)
4028 gfc_error ("INQUIRE statement at %L requires a PENDING= specifier with "
4029 "the ID= specifier", &loc);
4033 new_st.op = EXEC_INQUIRE;
4034 new_st.ext.inquire = inquire;
4038 gfc_syntax_error (ST_INQUIRE);
4041 gfc_free_inquire (inquire);
4046 /* Resolve everything in a gfc_inquire structure. */
4049 gfc_resolve_inquire (gfc_inquire *inquire)
4051 RESOLVE_TAG (&tag_unit, inquire->unit);
4052 RESOLVE_TAG (&tag_file, inquire->file);
4053 RESOLVE_TAG (&tag_id, inquire->id);
4055 /* For INQUIRE, all tags except FILE, ID and UNIT are variable definition
4056 contexts. Thus, use an extended RESOLVE_TAG macro for that. */
4057 #define INQUIRE_RESOLVE_TAG(tag, expr) \
4058 RESOLVE_TAG (tag, expr); \
4062 sprintf (context, _("%s tag with INQUIRE"), (tag)->name); \
4063 if (gfc_check_vardef_context ((expr), false, false, context) == FAILURE) \
4066 INQUIRE_RESOLVE_TAG (&tag_iomsg, inquire->iomsg);
4067 INQUIRE_RESOLVE_TAG (&tag_iostat, inquire->iostat);
4068 INQUIRE_RESOLVE_TAG (&tag_exist, inquire->exist);
4069 INQUIRE_RESOLVE_TAG (&tag_opened, inquire->opened);
4070 INQUIRE_RESOLVE_TAG (&tag_number, inquire->number);
4071 INQUIRE_RESOLVE_TAG (&tag_named, inquire->named);
4072 INQUIRE_RESOLVE_TAG (&tag_name, inquire->name);
4073 INQUIRE_RESOLVE_TAG (&tag_s_access, inquire->access);
4074 INQUIRE_RESOLVE_TAG (&tag_sequential, inquire->sequential);
4075 INQUIRE_RESOLVE_TAG (&tag_direct, inquire->direct);
4076 INQUIRE_RESOLVE_TAG (&tag_s_form, inquire->form);
4077 INQUIRE_RESOLVE_TAG (&tag_formatted, inquire->formatted);
4078 INQUIRE_RESOLVE_TAG (&tag_unformatted, inquire->unformatted);
4079 INQUIRE_RESOLVE_TAG (&tag_s_recl, inquire->recl);
4080 INQUIRE_RESOLVE_TAG (&tag_nextrec, inquire->nextrec);
4081 INQUIRE_RESOLVE_TAG (&tag_s_blank, inquire->blank);
4082 INQUIRE_RESOLVE_TAG (&tag_s_position, inquire->position);
4083 INQUIRE_RESOLVE_TAG (&tag_s_action, inquire->action);
4084 INQUIRE_RESOLVE_TAG (&tag_read, inquire->read);
4085 INQUIRE_RESOLVE_TAG (&tag_write, inquire->write);
4086 INQUIRE_RESOLVE_TAG (&tag_readwrite, inquire->readwrite);
4087 INQUIRE_RESOLVE_TAG (&tag_s_delim, inquire->delim);
4088 INQUIRE_RESOLVE_TAG (&tag_s_pad, inquire->pad);
4089 INQUIRE_RESOLVE_TAG (&tag_s_encoding, inquire->encoding);
4090 INQUIRE_RESOLVE_TAG (&tag_s_round, inquire->round);
4091 INQUIRE_RESOLVE_TAG (&tag_iolength, inquire->iolength);
4092 INQUIRE_RESOLVE_TAG (&tag_convert, inquire->convert);
4093 INQUIRE_RESOLVE_TAG (&tag_strm_out, inquire->strm_pos);
4094 INQUIRE_RESOLVE_TAG (&tag_s_async, inquire->asynchronous);
4095 INQUIRE_RESOLVE_TAG (&tag_s_sign, inquire->sign);
4096 INQUIRE_RESOLVE_TAG (&tag_s_round, inquire->round);
4097 INQUIRE_RESOLVE_TAG (&tag_pending, inquire->pending);
4098 INQUIRE_RESOLVE_TAG (&tag_size, inquire->size);
4099 INQUIRE_RESOLVE_TAG (&tag_s_decimal, inquire->decimal);
4100 #undef INQUIRE_RESOLVE_TAG
4102 if (gfc_reference_st_label (inquire->err, ST_LABEL_TARGET) == FAILURE)
4110 gfc_free_wait (gfc_wait *wait)
4115 gfc_free_expr (wait->unit);
4116 gfc_free_expr (wait->iostat);
4117 gfc_free_expr (wait->iomsg);
4118 gfc_free_expr (wait->id);
4123 gfc_resolve_wait (gfc_wait *wait)
4125 RESOLVE_TAG (&tag_unit, wait->unit);
4126 RESOLVE_TAG (&tag_iomsg, wait->iomsg);
4127 RESOLVE_TAG (&tag_iostat, wait->iostat);
4128 RESOLVE_TAG (&tag_id, wait->id);
4130 if (gfc_reference_st_label (wait->err, ST_LABEL_TARGET) == FAILURE)
4133 if (gfc_reference_st_label (wait->end, ST_LABEL_TARGET) == FAILURE)
4139 /* Match an element of a WAIT statement. */
4141 #define RETM if (m != MATCH_NO) return m;
4144 match_wait_element (gfc_wait *wait)
4148 m = match_etag (&tag_unit, &wait->unit);
4149 RETM m = match_ltag (&tag_err, &wait->err);
4150 RETM m = match_ltag (&tag_end, &wait->eor);
4151 RETM m = match_ltag (&tag_eor, &wait->end);
4152 RETM m = match_out_tag (&tag_iomsg, &wait->iomsg);
4153 RETM m = match_out_tag (&tag_iostat, &wait->iostat);
4154 RETM m = match_etag (&tag_id, &wait->id);
4155 RETM return MATCH_NO;
4162 gfc_match_wait (void)
4167 m = gfc_match_char ('(');
4171 wait = XCNEW (gfc_wait);
4173 m = match_wait_element (wait);
4174 if (m == MATCH_ERROR)
4178 m = gfc_match_expr (&wait->unit);
4179 if (m == MATCH_ERROR)
4187 if (gfc_match_char (')') == MATCH_YES)
4189 if (gfc_match_char (',') != MATCH_YES)
4192 m = match_wait_element (wait);
4193 if (m == MATCH_ERROR)
4199 if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: WAIT at %C "
4200 "not allowed in Fortran 95") == FAILURE)
4203 if (gfc_pure (NULL))
4205 gfc_error ("WAIT statement not allowed in PURE procedure at %C");
4209 if (gfc_implicit_pure (NULL))
4210 gfc_current_ns->proc_name->attr.implicit_pure = 0;
4212 new_st.op = EXEC_WAIT;
4213 new_st.ext.wait = wait;
4218 gfc_syntax_error (ST_WAIT);
4221 gfc_free_wait (wait);