1 /* Deal with I/O statements & related stuff.
2 Copyright (C) 2000, 2001, 2002, 2003, 2004, 2005, 2006 Free Software
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, 51 Franklin Street, Fifth Floor, Boston, MA
30 gfc_st_label format_asterisk =
31 {0, NULL, NULL, -1, ST_LABEL_FORMAT, ST_LABEL_FORMAT, 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_spos = {"POSITION", " pos = %e", BT_INTEGER},
56 tag_format = {"FORMAT", NULL, BT_CHARACTER},
57 tag_iomsg = {"IOMSG", " iomsg = %e", BT_CHARACTER},
58 tag_iostat = {"IOSTAT", " iostat = %v", BT_INTEGER},
59 tag_size = {"SIZE", " size = %v", BT_INTEGER},
60 tag_exist = {"EXIST", " exist = %v", BT_LOGICAL},
61 tag_opened = {"OPENED", " opened = %v", BT_LOGICAL},
62 tag_named = {"NAMED", " named = %v", BT_LOGICAL},
63 tag_name = {"NAME", " name = %v", BT_CHARACTER},
64 tag_number = {"NUMBER", " number = %v", BT_INTEGER},
65 tag_s_access = {"ACCESS", " access = %v", BT_CHARACTER},
66 tag_sequential = {"SEQUENTIAL", " sequential = %v", BT_CHARACTER},
67 tag_direct = {"DIRECT", " direct = %v", BT_CHARACTER},
68 tag_s_form = {"FORM", " form = %v", BT_CHARACTER},
69 tag_formatted = {"FORMATTED", " formatted = %v", BT_CHARACTER},
70 tag_unformatted = {"UNFORMATTED", " unformatted = %v", BT_CHARACTER},
71 tag_s_recl = {"RECL", " recl = %v", BT_INTEGER},
72 tag_nextrec = {"NEXTREC", " nextrec = %v", BT_INTEGER},
73 tag_s_blank = {"BLANK", " blank = %v", BT_CHARACTER},
74 tag_s_position = {"POSITION", " position = %v", BT_CHARACTER},
75 tag_s_action = {"ACTION", " action = %v", BT_CHARACTER},
76 tag_read = {"READ", " read = %v", BT_CHARACTER},
77 tag_write = {"WRITE", " write = %v", BT_CHARACTER},
78 tag_readwrite = {"READWRITE", " readwrite = %v", BT_CHARACTER},
79 tag_s_delim = {"DELIM", " delim = %v", BT_CHARACTER},
80 tag_s_pad = {"PAD", " pad = %v", BT_CHARACTER},
81 tag_iolength = {"IOLENGTH", " iolength = %v", BT_INTEGER},
82 tag_convert = {"CONVERT", " convert = %e", BT_CHARACTER},
83 tag_strm_out = {"POS", " pos = %v", BT_INTEGER},
84 tag_err = {"ERR", " err = %l", BT_UNKNOWN},
85 tag_end = {"END", " end = %l", BT_UNKNOWN},
86 tag_eor = {"EOR", " eor = %l", BT_UNKNOWN};
88 static gfc_dt *current_dt;
90 #define RESOLVE_TAG(x, y) if (resolve_tag(x, y) == FAILURE) return FAILURE;
93 /**************** Fortran 95 FORMAT parser *****************/
95 /* FORMAT tokens returned by format_lex(). */
98 FMT_NONE, FMT_UNKNOWN, FMT_SIGNED_INT, FMT_ZERO, FMT_POSINT, FMT_PERIOD,
99 FMT_COMMA, FMT_COLON, FMT_SLASH, FMT_DOLLAR, FMT_POS, FMT_LPAREN,
100 FMT_RPAREN, FMT_X, FMT_SIGN, FMT_BLANK, FMT_CHAR, FMT_P, FMT_IBOZ, FMT_F,
101 FMT_E, FMT_EXT, FMT_G, FMT_L, FMT_A, FMT_D, FMT_H, FMT_END
105 /* Local variables for checking format strings. The saved_token is
106 used to back up by a single format token during the parsing
108 static char *format_string;
109 static int format_length, use_last_char;
111 static format_token saved_token;
114 { MODE_STRING, MODE_FORMAT, MODE_COPY }
118 /* Return the next character in the format string. */
121 next_char (int in_string)
133 if (mode == MODE_STRING)
134 c = *format_string++;
137 c = gfc_next_char_literal (in_string);
141 if (mode == MODE_COPY)
142 *format_string++ = c;
150 /* Back up one character position. Only works once. */
159 /* Eat up the spaces and return a character. */
162 next_char_not_space(void)
169 while (gfc_is_whitespace (c));
173 static int value = 0;
175 /* Simple lexical analyzer for getting the next token in a FORMAT
186 if (saved_token != FMT_NONE)
189 saved_token = FMT_NONE;
193 c = next_char_not_space ();
201 c = next_char_not_space ();
212 c = next_char_not_space ();
214 value = 10 * value + c - '0';
223 token = FMT_SIGNED_INT;
242 c = next_char_not_space ();
246 value = 10 * value + c - '0';
251 token = zflag ? FMT_ZERO : FMT_POSINT;
275 c = next_char_not_space ();
276 if (c != 'L' && c != 'R')
295 c = next_char_not_space ();
296 if (c != 'P' && c != 'S')
303 c = next_char_not_space ();
304 if (c == 'N' || c == 'Z')
365 c = next_char_not_space ();
366 if (c == 'N' || c == 'S')
409 /* Check a format statement. The format string, either from a FORMAT
410 statement or a constant in an I/O statement has already been parsed
411 by itself, and we are checking it for validity. The dual origin
412 means that the warning message is a little less than great. */
417 const char *posint_required = _("Positive width required");
418 const char *nonneg_required = _("Nonnegative width required");
419 const char *unexpected_element = _("Unexpected element");
420 const char *unexpected_end = _("Unexpected end of format string");
429 saved_token = FMT_NONE;
437 error = _("Missing leading left parenthesis");
443 goto finished; /* Empty format is legal */
447 /* In this state, the next thing has to be a format item. */
471 /* Signed integer can only precede a P format. */
475 error = _("Expected P edit descriptor");
482 /* P requires a prior number. */
483 error = _("P descriptor requires leading scale factor");
487 /* X requires a prior number if we're being pedantic. */
488 if (gfc_notify_std (GFC_STD_GNU, "Extension: X descriptor "
489 "requires leading space count at %C")
499 goto extension_optional_comma;
508 if (gfc_notify_std (GFC_STD_GNU, "Extension: $ descriptor at %C")
511 if (t != FMT_RPAREN || level > 0)
513 error = _("$ must be the last specifier");
534 error = unexpected_end;
538 error = unexpected_element;
543 /* In this state, t must currently be a data descriptor.
544 Deal with things that can/must follow the descriptor. */
558 error = _("Repeat count cannot follow P descriptor");
573 switch (gfc_notification_std (GFC_STD_GNU))
577 ("Extension: Missing positive width after L descriptor at %C");
582 error = posint_required;
607 error = posint_required;
614 /* Warn if -std=legacy, otherwise error. */
615 if (gfc_option.warn_std != 0)
616 gfc_error_now ("Period required in format specifier at %C");
618 gfc_warning ("Period required in format specifier at %C");
624 if (u != FMT_ZERO && u != FMT_POSINT)
626 error = nonneg_required;
633 /* Look for optional exponent. */
644 error = _("Positive exponent width required");
653 if (t != FMT_ZERO && t != FMT_POSINT)
655 error = nonneg_required;
662 /* Warn if -std=legacy, otherwise error. */
663 if (gfc_option.warn_std != 0)
664 gfc_error_now ("Period required in format specifier at %C");
666 gfc_warning ("Period required in format specifier at %C");
672 if (t != FMT_ZERO && t != FMT_POSINT)
674 error = nonneg_required;
681 if(mode == MODE_STRING)
683 format_string += value;
684 format_length -= value;
698 if (t != FMT_ZERO && t != FMT_POSINT)
700 error = nonneg_required;
712 if (t != FMT_ZERO && t != FMT_POSINT)
714 error = nonneg_required;
722 error = unexpected_element;
727 /* Between a descriptor and what comes next. */
746 error = unexpected_end;
750 if (gfc_notify_std (GFC_STD_GNU, "Extension: Missing comma at %C")
757 /* Optional comma is a weird between state where we've just finished
758 reading a colon, slash or P descriptor. */
772 /* Assume that we have another format item. */
779 extension_optional_comma:
780 /* As a GNU extension, permit a missing comma after a string literal. */
798 error = unexpected_end;
802 if (gfc_notify_std (GFC_STD_GNU, "Extension: Missing comma at %C")
812 /* Something went wrong. If the format we're checking is a string,
813 generate a warning, since the program is correct. If the format
814 is in a FORMAT statement, this messes up parsing, which is an
816 if (mode != MODE_STRING)
817 gfc_error ("%s in format string at %C", error);
820 gfc_warning ("%s in format string at %C", error);
822 /* TODO: More elaborate measures are needed to show where a problem
823 is within a format string that has been calculated. */
833 /* Given an expression node that is a constant string, see if it looks
834 like a format string. */
837 check_format_string (gfc_expr * e)
841 format_string = e->value.character.string;
846 /************ Fortran 95 I/O statement matchers *************/
848 /* Match a FORMAT statement. This amounts to actually parsing the
849 format descriptors in order to correctly locate the end of the
853 gfc_match_format (void)
858 if (gfc_current_ns->proc_name
859 && gfc_current_ns->proc_name->attr.flavor == FL_MODULE)
861 gfc_error ("Format statement in module main block at %C.");
865 if (gfc_statement_label == NULL)
867 gfc_error ("Missing format label at %C");
870 gfc_gobble_whitespace ();
875 start = gfc_current_locus;
877 if (check_format () == FAILURE)
880 if (gfc_match_eos () != MATCH_YES)
882 gfc_syntax_error (ST_FORMAT);
886 /* The label doesn't get created until after the statement is done
887 being matched, so we have to leave the string for later. */
889 gfc_current_locus = start; /* Back to the beginning */
892 new_st.op = EXEC_NOP;
895 e->expr_type = EXPR_CONSTANT;
896 e->ts.type = BT_CHARACTER;
897 e->ts.kind = gfc_default_character_kind;
899 e->value.character.string = format_string = gfc_getmem(format_length+1);
900 e->value.character.length = format_length;
901 gfc_statement_label->format = e;
904 check_format (); /* Guaranteed to succeed */
905 gfc_match_eos (); /* Guaranteed to succeed */
911 /* Match an expression I/O tag of some sort. */
914 match_etag (const io_tag * tag, gfc_expr ** v)
919 m = gfc_match (tag->spec, &result);
925 gfc_error ("Duplicate %s specification at %C", tag->name);
926 gfc_free_expr (result);
935 /* Match a variable I/O tag of some sort. */
938 match_vtag (const io_tag * tag, gfc_expr ** v)
943 m = gfc_match (tag->spec, &result);
949 gfc_error ("Duplicate %s specification at %C", tag->name);
950 gfc_free_expr (result);
954 if (result->symtree->n.sym->attr.intent == INTENT_IN)
956 gfc_error ("Variable tag cannot be INTENT(IN) at %C");
957 gfc_free_expr (result);
961 if (gfc_pure (NULL) && gfc_impure_variable (result->symtree->n.sym))
963 gfc_error ("Variable tag cannot be assigned in PURE procedure at %C");
964 gfc_free_expr (result);
973 /* Match I/O tags that cause variables to become redefined. */
976 match_out_tag(const io_tag *tag, gfc_expr **result)
980 m = match_vtag(tag, result);
982 gfc_check_do_variable((*result)->symtree);
988 /* Match a label I/O tag. */
991 match_ltag (const io_tag * tag, gfc_st_label ** label)
997 m = gfc_match (tag->spec, label);
998 if (m == MATCH_YES && old != 0)
1000 gfc_error ("Duplicate %s label specification at %C", tag->name);
1005 && gfc_reference_st_label (*label, ST_LABEL_TARGET) == FAILURE)
1012 /* Do expression resolution and type-checking on an expression tag. */
1015 resolve_tag (const io_tag * tag, gfc_expr * e)
1021 if (gfc_resolve_expr (e) == FAILURE)
1024 if (e->ts.type != tag->type && tag != &tag_format)
1026 gfc_error ("%s tag at %L must be of type %s", tag->name,
1027 &e->where, gfc_basic_typename (tag->type));
1031 if (tag == &tag_format)
1033 if (e->expr_type == EXPR_CONSTANT
1034 && (e->ts.type != BT_CHARACTER
1035 || e->ts.kind != gfc_default_character_kind))
1037 gfc_error ("Constant expression in FORMAT tag at %L must be "
1038 "of type default CHARACTER", &e->where);
1042 /* If e's rank is zero and e is not an element of an array, it should be
1043 of integer or character type. The integer variable should be
1045 if (e->symtree == NULL || e->symtree->n.sym->as == NULL
1046 || e->symtree->n.sym->as->rank == 0)
1048 if (e->ts.type != BT_CHARACTER && e->ts.type != BT_INTEGER)
1050 gfc_error ("%s tag at %L must be of type %s or %s", tag->name,
1051 &e->where, gfc_basic_typename (BT_CHARACTER),
1052 gfc_basic_typename (BT_INTEGER));
1055 else if (e->ts.type == BT_INTEGER && e->expr_type == EXPR_VARIABLE)
1057 if (gfc_notify_std (GFC_STD_F95_DEL,
1058 "Obsolete: ASSIGNED variable in FORMAT tag at %L",
1059 &e->where) == FAILURE)
1061 if (e->symtree->n.sym->attr.assign != 1)
1063 gfc_error ("Variable '%s' at %L has not been assigned a "
1064 "format label", e->symtree->n.sym->name, &e->where);
1068 else if (e->ts.type == BT_INTEGER)
1070 gfc_error ("scalar '%s' FORMAT tag at %L is not an ASSIGNED "
1071 "variable", gfc_basic_typename (e->ts.type), &e->where);
1079 /* if rank is nonzero, we allow the type to be character under
1080 GFC_STD_GNU and other type under GFC_STD_LEGACY. It may be
1081 assigned an Hollerith constant. */
1082 if (e->ts.type == BT_CHARACTER)
1084 if (gfc_notify_std (GFC_STD_GNU,
1085 "Extension: Character array in FORMAT tag at %L",
1086 &e->where) == FAILURE)
1091 if (gfc_notify_std (GFC_STD_LEGACY,
1092 "Extension: Non-character in FORMAT tag at %L",
1093 &e->where) == FAILURE)
1103 gfc_error ("%s tag at %L must be scalar", tag->name, &e->where);
1107 if (tag == &tag_iomsg)
1109 if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: IOMSG tag at %L",
1110 &e->where) == FAILURE)
1114 if (tag == &tag_iostat && e->ts.kind != gfc_default_integer_kind)
1116 if (gfc_notify_std (GFC_STD_GNU, "Fortran 95 requires default "
1117 "INTEGER in IOSTAT tag at %L",
1118 &e->where) == FAILURE)
1122 if (tag == &tag_size && e->ts.kind != gfc_default_integer_kind)
1124 if (gfc_notify_std (GFC_STD_GNU, "Fortran 95 requires default "
1125 "INTEGER in SIZE tag at %L",
1126 &e->where) == FAILURE)
1130 if (tag == &tag_convert)
1132 if (gfc_notify_std (GFC_STD_GNU, "Extension: CONVERT tag at %L",
1133 &e->where) == FAILURE)
1142 /* Match a single tag of an OPEN statement. */
1145 match_open_element (gfc_open * open)
1149 m = match_etag (&tag_unit, &open->unit);
1152 m = match_out_tag (&tag_iomsg, &open->iomsg);
1155 m = match_out_tag (&tag_iostat, &open->iostat);
1158 m = match_etag (&tag_file, &open->file);
1161 m = match_etag (&tag_status, &open->status);
1164 m = match_etag (&tag_e_access, &open->access);
1167 m = match_etag (&tag_e_form, &open->form);
1170 m = match_etag (&tag_e_recl, &open->recl);
1173 m = match_etag (&tag_e_blank, &open->blank);
1176 m = match_etag (&tag_e_position, &open->position);
1179 m = match_etag (&tag_e_action, &open->action);
1182 m = match_etag (&tag_e_delim, &open->delim);
1185 m = match_etag (&tag_e_pad, &open->pad);
1188 m = match_ltag (&tag_err, &open->err);
1191 m = match_etag (&tag_convert, &open->convert);
1199 /* Free the gfc_open structure and all the expressions it contains. */
1202 gfc_free_open (gfc_open * open)
1208 gfc_free_expr (open->unit);
1209 gfc_free_expr (open->iomsg);
1210 gfc_free_expr (open->iostat);
1211 gfc_free_expr (open->file);
1212 gfc_free_expr (open->status);
1213 gfc_free_expr (open->access);
1214 gfc_free_expr (open->form);
1215 gfc_free_expr (open->recl);
1216 gfc_free_expr (open->blank);
1217 gfc_free_expr (open->position);
1218 gfc_free_expr (open->action);
1219 gfc_free_expr (open->delim);
1220 gfc_free_expr (open->pad);
1221 gfc_free_expr (open->convert);
1227 /* Resolve everything in a gfc_open structure. */
1230 gfc_resolve_open (gfc_open * open)
1233 RESOLVE_TAG (&tag_unit, open->unit);
1234 RESOLVE_TAG (&tag_iomsg, open->iomsg);
1235 RESOLVE_TAG (&tag_iostat, open->iostat);
1236 RESOLVE_TAG (&tag_file, open->file);
1237 RESOLVE_TAG (&tag_status, open->status);
1238 RESOLVE_TAG (&tag_e_access, open->access);
1239 RESOLVE_TAG (&tag_e_form, open->form);
1240 RESOLVE_TAG (&tag_e_recl, open->recl);
1242 RESOLVE_TAG (&tag_e_blank, open->blank);
1243 RESOLVE_TAG (&tag_e_position, open->position);
1244 RESOLVE_TAG (&tag_e_action, open->action);
1245 RESOLVE_TAG (&tag_e_delim, open->delim);
1246 RESOLVE_TAG (&tag_e_pad, open->pad);
1247 RESOLVE_TAG (&tag_convert, open->convert);
1249 if (gfc_reference_st_label (open->err, ST_LABEL_TARGET) == FAILURE)
1257 /* Check if a given value for a SPECIFIER is either in the list of values
1258 allowed in F95 or F2003, issuing an error message and returning a zero
1259 value if it is not allowed. */
1261 compare_to_allowed_values (const char * specifier, const char * allowed[],
1262 const char * allowed_f2003[],
1263 const char * allowed_gnu[], char * value,
1264 const char * statement, bool warn)
1269 len = strlen(value);
1272 for (len--; len > 0; len--)
1273 if (value[len] != ' ')
1278 for (i = 0; allowed[i]; i++)
1279 if (len == strlen(allowed[i])
1280 && strncasecmp (value, allowed[i], strlen(allowed[i])) == 0)
1283 for (i = 0; allowed_f2003 && allowed_f2003[i]; i++)
1284 if (len == strlen(allowed_f2003[i])
1285 && strncasecmp (value, allowed_f2003[i], strlen(allowed_f2003[i])) == 0)
1287 notification n = gfc_notification_std (GFC_STD_F2003);
1289 if (n == WARNING || (warn && n == ERROR))
1291 gfc_warning ("Fortran 2003: %s specifier in %s statement at %C "
1292 "has value '%s'", specifier, statement,
1299 gfc_notify_std (GFC_STD_F2003, "Fortran 2003: %s specifier in "
1300 "%s statement at %C has value '%s'", specifier,
1301 statement, allowed_f2003[i]);
1309 for (i = 0; allowed_gnu && allowed_gnu[i]; i++)
1310 if (len == strlen(allowed_gnu[i])
1311 && strncasecmp (value, allowed_gnu[i], strlen(allowed_gnu[i])) == 0)
1313 notification n = gfc_notification_std (GFC_STD_GNU);
1315 if (n == WARNING || (warn && n == ERROR))
1317 gfc_warning ("Extension: %s specifier in %s statement at %C "
1318 "has value '%s'", specifier, statement,
1325 gfc_notify_std (GFC_STD_GNU, "Extension: %s specifier in "
1326 "%s statement at %C has value '%s'", specifier,
1327 statement, allowed_gnu[i]);
1337 gfc_warning ("%s specifier in %s statement at %C has invalid value '%s'",
1338 specifier, statement, value);
1343 gfc_error ("%s specifier in %s statement at %C has invalid value '%s'",
1344 specifier, statement, value);
1349 /* Match an OPEN statement. */
1352 gfc_match_open (void)
1358 m = gfc_match_char ('(');
1362 open = gfc_getmem (sizeof (gfc_open));
1364 m = match_open_element (open);
1366 if (m == MATCH_ERROR)
1370 m = gfc_match_expr (&open->unit);
1373 if (m == MATCH_ERROR)
1379 if (gfc_match_char (')') == MATCH_YES)
1381 if (gfc_match_char (',') != MATCH_YES)
1384 m = match_open_element (open);
1385 if (m == MATCH_ERROR)
1391 if (gfc_match_eos () == MATCH_NO)
1394 if (gfc_pure (NULL))
1396 gfc_error ("OPEN statement not allowed in PURE procedure at %C");
1400 warn = (open->err || open->iostat) ? true : false;
1401 /* Checks on the ACCESS specifier. */
1402 if (open->access && open->access->expr_type == EXPR_CONSTANT)
1404 static const char * access_f95[] = { "SEQUENTIAL", "DIRECT", NULL };
1405 static const char * access_f2003[] = { "STREAM", NULL };
1406 static const char * access_gnu[] = { "APPEND", NULL };
1408 if (!compare_to_allowed_values ("ACCESS", access_f95, access_f2003,
1410 open->access->value.character.string,
1415 /* Checks on the ACTION specifier. */
1416 if (open->action && open->action->expr_type == EXPR_CONSTANT)
1418 static const char * action[] = { "READ", "WRITE", "READWRITE", NULL };
1420 if (!compare_to_allowed_values ("ACTION", action, NULL, NULL,
1421 open->action->value.character.string,
1426 /* Checks on the ASYNCHRONOUS specifier. */
1427 /* TODO: code is ready, just needs uncommenting when async I/O support
1429 if (open->asynchronous && open->asynchronous->expr_type == EXPR_CONSTANT)
1431 static const char * asynchronous[] = { "YES", "NO", NULL };
1433 if (!compare_to_allowed_values
1434 ("action", asynchronous, NULL, NULL,
1435 open->asynchronous->value.character.string, "OPEN", warn))
1439 /* Checks on the BLANK specifier. */
1440 if (open->blank && open->blank->expr_type == EXPR_CONSTANT)
1442 static const char * blank[] = { "ZERO", "NULL", NULL };
1444 if (!compare_to_allowed_values ("BLANK", blank, NULL, NULL,
1445 open->blank->value.character.string,
1450 /* Checks on the DECIMAL specifier. */
1451 /* TODO: uncomment this code when DECIMAL support is added
1452 if (open->decimal && open->decimal->expr_type == EXPR_CONSTANT)
1454 static const char * decimal[] = { "COMMA", "POINT", NULL };
1456 if (!compare_to_allowed_values ("DECIMAL", decimal, NULL, NULL,
1457 open->decimal->value.character.string,
1462 /* Checks on the DELIM specifier. */
1463 if (open->delim && open->delim->expr_type == EXPR_CONSTANT)
1465 static const char * delim[] = { "APOSTROPHE", "QUOTE", "NONE", NULL };
1467 if (!compare_to_allowed_values ("DELIM", delim, NULL, NULL,
1468 open->delim->value.character.string,
1473 /* Checks on the ENCODING specifier. */
1474 /* TODO: uncomment this code when ENCODING support is added
1475 if (open->encoding && open->encoding->expr_type == EXPR_CONSTANT)
1477 static const char * encoding[] = { "UTF-8", "DEFAULT", NULL };
1479 if (!compare_to_allowed_values ("ENCODING", encoding, NULL, NULL,
1480 open->encoding->value.character.string,
1485 /* Checks on the FORM specifier. */
1486 if (open->form && open->form->expr_type == EXPR_CONSTANT)
1488 static const char * form[] = { "FORMATTED", "UNFORMATTED", NULL };
1490 if (!compare_to_allowed_values ("FORM", form, NULL, NULL,
1491 open->form->value.character.string,
1496 /* Checks on the PAD specifier. */
1497 if (open->pad && open->pad->expr_type == EXPR_CONSTANT)
1499 static const char * pad[] = { "YES", "NO", NULL };
1501 if (!compare_to_allowed_values ("PAD", pad, NULL, NULL,
1502 open->pad->value.character.string,
1507 /* Checks on the POSITION specifier. */
1508 if (open->position && open->position->expr_type == EXPR_CONSTANT)
1510 static const char * position[] = { "ASIS", "REWIND", "APPEND", NULL };
1512 if (!compare_to_allowed_values ("POSITION", position, NULL, NULL,
1513 open->position->value.character.string,
1518 /* Checks on the ROUND specifier. */
1519 /* TODO: uncomment this code when ROUND support is added
1520 if (open->round && open->round->expr_type == EXPR_CONSTANT)
1522 static const char * round[] = { "UP", "DOWN", "ZERO", "NEAREST",
1523 "COMPATIBLE", "PROCESSOR_DEFINED", NULL };
1525 if (!compare_to_allowed_values ("ROUND", round, NULL, NULL,
1526 open->round->value.character.string,
1531 /* Checks on the SIGN specifier. */
1532 /* TODO: uncomment this code when SIGN support is added
1533 if (open->sign && open->sign->expr_type == EXPR_CONSTANT)
1535 static const char * sign[] = { "PLUS", "SUPPRESS", "PROCESSOR_DEFINED",
1538 if (!compare_to_allowed_values ("SIGN", sign, NULL, NULL,
1539 open->sign->value.character.string,
1544 #define warn_or_error(...) \
1547 gfc_warning (__VA_ARGS__); \
1550 gfc_error (__VA_ARGS__); \
1555 /* Checks on the RECL specifier. */
1556 if (open->recl && open->recl->expr_type == EXPR_CONSTANT
1557 && open->recl->ts.type == BT_INTEGER
1558 && mpz_sgn (open->recl->value.integer) != 1)
1560 warn_or_error ("RECL in OPEN statement at %C must be positive");
1563 /* Checks on the STATUS specifier. */
1564 if (open->status && open->status->expr_type == EXPR_CONSTANT)
1566 static const char * status[] = { "OLD", "NEW", "SCRATCH",
1567 "REPLACE", "UNKNOWN", NULL };
1569 if (!compare_to_allowed_values ("STATUS", status, NULL, NULL,
1570 open->status->value.character.string,
1574 /* F2003, 9.4.5: If the STATUS= specifier has the value NEW or REPLACE,
1575 the FILE= specifier shall appear. */
1576 if (open->file == NULL &&
1577 (strncasecmp (open->status->value.character.string, "replace", 7) == 0
1578 || strncasecmp (open->status->value.character.string, "new", 3) == 0))
1580 warn_or_error ("The STATUS specified in OPEN statement at %C is '%s' "
1581 "and no FILE specifier is present",
1582 open->status->value.character.string);
1585 /* F2003, 9.4.5: If the STATUS= specifier has the value SCRATCH,
1586 the FILE= specifier shall not appear. */
1587 if (strncasecmp (open->status->value.character.string, "scratch", 7) == 0
1590 warn_or_error ("The STATUS specified in OPEN statement at %C cannot "
1591 "have the value SCRATCH if a FILE specifier "
1596 /* Things that are not allowed for unformatted I/O. */
1597 if (open->form && open->form->expr_type == EXPR_CONSTANT
1599 /* TODO uncomment this code when F2003 support is finished */
1600 /* || open->decimal || open->encoding || open->round
1602 || open->pad || open->blank)
1603 && strncasecmp (open->form->value.character.string,
1604 "unformatted", 11) == 0)
1606 const char * spec = (open->delim ? "DELIM " : (open->pad ? "PAD " :
1607 open->blank ? "BLANK " : ""));
1609 warn_or_error ("%sspecifier at %C not allowed in OPEN statement for "
1610 "unformatted I/O", spec);
1613 if (open->recl && open->access && open->access->expr_type == EXPR_CONSTANT
1614 && strncasecmp (open->access->value.character.string, "stream", 6) == 0)
1616 warn_or_error ("RECL specifier not allowed in OPEN statement at %C for "
1620 if (open->position && open->access && open->access->expr_type == EXPR_CONSTANT
1621 && !(strncasecmp (open->access->value.character.string,
1622 "sequential", 10) == 0
1623 || strncasecmp (open->access->value.character.string,
1625 || strncasecmp (open->access->value.character.string,
1628 warn_or_error ("POSITION specifier in OPEN statement at %C only allowed "
1629 "for stream or sequential ACCESS");
1632 #undef warn_or_error
1634 new_st.op = EXEC_OPEN;
1635 new_st.ext.open = open;
1639 gfc_syntax_error (ST_OPEN);
1642 gfc_free_open (open);
1647 /* Free a gfc_close structure an all its expressions. */
1650 gfc_free_close (gfc_close * close)
1656 gfc_free_expr (close->unit);
1657 gfc_free_expr (close->iomsg);
1658 gfc_free_expr (close->iostat);
1659 gfc_free_expr (close->status);
1665 /* Match elements of a CLOSE statement. */
1668 match_close_element (gfc_close * close)
1672 m = match_etag (&tag_unit, &close->unit);
1675 m = match_etag (&tag_status, &close->status);
1678 m = match_out_tag (&tag_iomsg, &close->iomsg);
1681 m = match_out_tag (&tag_iostat, &close->iostat);
1684 m = match_ltag (&tag_err, &close->err);
1692 /* Match a CLOSE statement. */
1695 gfc_match_close (void)
1701 m = gfc_match_char ('(');
1705 close = gfc_getmem (sizeof (gfc_close));
1707 m = match_close_element (close);
1709 if (m == MATCH_ERROR)
1713 m = gfc_match_expr (&close->unit);
1716 if (m == MATCH_ERROR)
1722 if (gfc_match_char (')') == MATCH_YES)
1724 if (gfc_match_char (',') != MATCH_YES)
1727 m = match_close_element (close);
1728 if (m == MATCH_ERROR)
1734 if (gfc_match_eos () == MATCH_NO)
1737 if (gfc_pure (NULL))
1739 gfc_error ("CLOSE statement not allowed in PURE procedure at %C");
1743 warn = (close->iostat || close->err) ? true : false;
1745 /* Checks on the STATUS specifier. */
1746 if (close->status && close->status->expr_type == EXPR_CONSTANT)
1748 static const char * status[] = { "KEEP", "DELETE", NULL };
1750 if (!compare_to_allowed_values ("STATUS", status, NULL, NULL,
1751 close->status->value.character.string,
1756 new_st.op = EXEC_CLOSE;
1757 new_st.ext.close = close;
1761 gfc_syntax_error (ST_CLOSE);
1764 gfc_free_close (close);
1769 /* Resolve everything in a gfc_close structure. */
1772 gfc_resolve_close (gfc_close * close)
1775 RESOLVE_TAG (&tag_unit, close->unit);
1776 RESOLVE_TAG (&tag_iomsg, close->iomsg);
1777 RESOLVE_TAG (&tag_iostat, close->iostat);
1778 RESOLVE_TAG (&tag_status, close->status);
1780 if (gfc_reference_st_label (close->err, ST_LABEL_TARGET) == FAILURE)
1787 /* Free a gfc_filepos structure. */
1790 gfc_free_filepos (gfc_filepos * fp)
1793 gfc_free_expr (fp->unit);
1794 gfc_free_expr (fp->iomsg);
1795 gfc_free_expr (fp->iostat);
1800 /* Match elements of a REWIND, BACKSPACE, ENDFILE, or FLUSH statement. */
1803 match_file_element (gfc_filepos * fp)
1807 m = match_etag (&tag_unit, &fp->unit);
1810 m = match_out_tag (&tag_iomsg, &fp->iomsg);
1813 m = match_out_tag (&tag_iostat, &fp->iostat);
1816 m = match_ltag (&tag_err, &fp->err);
1824 /* Match the second half of the file-positioning statements, REWIND,
1825 BACKSPACE, ENDFILE, or the FLUSH statement. */
1828 match_filepos (gfc_statement st, gfc_exec_op op)
1833 fp = gfc_getmem (sizeof (gfc_filepos));
1835 if (gfc_match_char ('(') == MATCH_NO)
1837 m = gfc_match_expr (&fp->unit);
1838 if (m == MATCH_ERROR)
1846 m = match_file_element (fp);
1847 if (m == MATCH_ERROR)
1851 m = gfc_match_expr (&fp->unit);
1852 if (m == MATCH_ERROR)
1860 if (gfc_match_char (')') == MATCH_YES)
1862 if (gfc_match_char (',') != MATCH_YES)
1865 m = match_file_element (fp);
1866 if (m == MATCH_ERROR)
1873 if (gfc_match_eos () != MATCH_YES)
1876 if (gfc_pure (NULL))
1878 gfc_error ("%s statement not allowed in PURE procedure at %C",
1879 gfc_ascii_statement (st));
1885 new_st.ext.filepos = fp;
1889 gfc_syntax_error (st);
1892 gfc_free_filepos (fp);
1898 gfc_resolve_filepos (gfc_filepos * fp)
1901 RESOLVE_TAG (&tag_unit, fp->unit);
1902 RESOLVE_TAG (&tag_iostat, fp->iostat);
1903 RESOLVE_TAG (&tag_iomsg, fp->iomsg);
1904 if (gfc_reference_st_label (fp->err, ST_LABEL_TARGET) == FAILURE)
1911 /* Match the file positioning statements: ENDFILE, BACKSPACE, REWIND,
1912 and the FLUSH statement. */
1915 gfc_match_endfile (void)
1918 return match_filepos (ST_END_FILE, EXEC_ENDFILE);
1922 gfc_match_backspace (void)
1925 return match_filepos (ST_BACKSPACE, EXEC_BACKSPACE);
1929 gfc_match_rewind (void)
1932 return match_filepos (ST_REWIND, EXEC_REWIND);
1936 gfc_match_flush (void)
1938 if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: FLUSH statement at %C") == FAILURE)
1941 return match_filepos (ST_FLUSH, EXEC_FLUSH);
1944 /******************** Data Transfer Statements *********************/
1947 { M_READ, M_WRITE, M_PRINT, M_INQUIRE }
1951 /* Return a default unit number. */
1954 default_unit (io_kind k)
1963 return gfc_int_expr (unit);
1967 /* Match a unit specification for a data transfer statement. */
1970 match_dt_unit (io_kind k, gfc_dt * dt)
1974 if (gfc_match_char ('*') == MATCH_YES)
1976 if (dt->io_unit != NULL)
1979 dt->io_unit = default_unit (k);
1983 if (gfc_match_expr (&e) == MATCH_YES)
1985 if (dt->io_unit != NULL)
1998 gfc_error ("Duplicate UNIT specification at %C");
2003 /* Match a format specification. */
2006 match_dt_format (gfc_dt * dt)
2010 gfc_st_label *label;
2012 where = gfc_current_locus;
2014 if (gfc_match_char ('*') == MATCH_YES)
2016 if (dt->format_expr != NULL || dt->format_label != NULL)
2019 dt->format_label = &format_asterisk;
2023 if (gfc_match_st_label (&label) == MATCH_YES)
2025 if (dt->format_expr != NULL || dt->format_label != NULL)
2027 gfc_free_st_label (label);
2031 if (gfc_reference_st_label (label, ST_LABEL_FORMAT) == FAILURE)
2034 dt->format_label = label;
2038 if (gfc_match_expr (&e) == MATCH_YES)
2040 if (dt->format_expr != NULL || dt->format_label != NULL)
2045 dt->format_expr = e;
2049 gfc_current_locus = where; /* The only case where we have to restore */
2054 gfc_error ("Duplicate format specification at %C");
2059 /* Traverse a namelist that is part of a READ statement to make sure
2060 that none of the variables in the namelist are INTENT(IN). Returns
2061 nonzero if we find such a variable. */
2064 check_namelist (gfc_symbol * sym)
2068 for (p = sym->namelist; p; p = p->next)
2069 if (p->sym->attr.intent == INTENT_IN)
2071 gfc_error ("Symbol '%s' in namelist '%s' is INTENT(IN) at %C",
2072 p->sym->name, sym->name);
2080 /* Match a single data transfer element. */
2083 match_dt_element (io_kind k, gfc_dt * dt)
2085 char name[GFC_MAX_SYMBOL_LEN + 1];
2089 if (gfc_match (" unit =") == MATCH_YES)
2091 m = match_dt_unit (k, dt);
2096 if (gfc_match (" fmt =") == MATCH_YES)
2098 m = match_dt_format (dt);
2103 if (gfc_match (" nml = %n", name) == MATCH_YES)
2105 if (dt->namelist != NULL)
2107 gfc_error ("Duplicate NML specification at %C");
2111 if (gfc_find_symbol (name, NULL, 1, &sym))
2114 if (sym == NULL || sym->attr.flavor != FL_NAMELIST)
2116 gfc_error ("Symbol '%s' at %C must be a NAMELIST group name",
2117 sym != NULL ? sym->name : name);
2122 if (k == M_READ && check_namelist (sym))
2128 m = match_etag (&tag_rec, &dt->rec);
2131 m = match_etag (&tag_spos, &dt->rec);
2134 m = match_out_tag (&tag_iomsg, &dt->iomsg);
2137 m = match_out_tag (&tag_iostat, &dt->iostat);
2140 m = match_ltag (&tag_err, &dt->err);
2142 dt->err_where = gfc_current_locus;
2145 m = match_etag (&tag_advance, &dt->advance);
2148 m = match_out_tag (&tag_size, &dt->size);
2152 m = match_ltag (&tag_end, &dt->end);
2157 gfc_error ("END tag at %C not allowed in output statement");
2160 dt->end_where = gfc_current_locus;
2165 m = match_ltag (&tag_eor, &dt->eor);
2167 dt->eor_where = gfc_current_locus;
2175 /* Free a data transfer structure and everything below it. */
2178 gfc_free_dt (gfc_dt * dt)
2184 gfc_free_expr (dt->io_unit);
2185 gfc_free_expr (dt->format_expr);
2186 gfc_free_expr (dt->rec);
2187 gfc_free_expr (dt->advance);
2188 gfc_free_expr (dt->iomsg);
2189 gfc_free_expr (dt->iostat);
2190 gfc_free_expr (dt->size);
2196 /* Resolve everything in a gfc_dt structure. */
2199 gfc_resolve_dt (gfc_dt * dt)
2203 RESOLVE_TAG (&tag_format, dt->format_expr);
2204 RESOLVE_TAG (&tag_rec, dt->rec);
2205 RESOLVE_TAG (&tag_spos, dt->rec);
2206 RESOLVE_TAG (&tag_advance, dt->advance);
2207 RESOLVE_TAG (&tag_iomsg, dt->iomsg);
2208 RESOLVE_TAG (&tag_iostat, dt->iostat);
2209 RESOLVE_TAG (&tag_size, dt->size);
2212 if (gfc_resolve_expr (e) == SUCCESS
2213 && (e->ts.type != BT_INTEGER
2214 && (e->ts.type != BT_CHARACTER
2215 || e->expr_type != EXPR_VARIABLE)))
2218 ("UNIT specification at %L must be an INTEGER expression or a "
2219 "CHARACTER variable", &e->where);
2223 if (e->ts.type == BT_CHARACTER)
2225 if (gfc_has_vector_index (e))
2227 gfc_error ("Internal unit with vector subscript at %L",
2233 if (e->rank && e->ts.type != BT_CHARACTER)
2235 gfc_error ("External IO UNIT cannot be an array at %L", &e->where);
2241 if (gfc_reference_st_label (dt->err, ST_LABEL_TARGET) == FAILURE)
2243 if (dt->err->defined == ST_LABEL_UNKNOWN)
2245 gfc_error ("ERR tag label %d at %L not defined",
2246 dt->err->value, &dt->err_where);
2253 if (gfc_reference_st_label (dt->end, ST_LABEL_TARGET) == FAILURE)
2255 if (dt->end->defined == ST_LABEL_UNKNOWN)
2257 gfc_error ("END tag label %d at %L not defined",
2258 dt->end->value, &dt->end_where);
2265 if (gfc_reference_st_label (dt->eor, ST_LABEL_TARGET) == FAILURE)
2267 if (dt->eor->defined == ST_LABEL_UNKNOWN)
2269 gfc_error ("EOR tag label %d at %L not defined",
2270 dt->eor->value, &dt->eor_where);
2275 /* Check the format label actually exists. */
2276 if (dt->format_label && dt->format_label != &format_asterisk
2277 && dt->format_label->defined == ST_LABEL_UNKNOWN)
2279 gfc_error ("FORMAT label %d at %L not defined", dt->format_label->value,
2280 &dt->format_label->where);
2287 /* Given an io_kind, return its name. */
2290 io_kind_name (io_kind k)
2309 gfc_internal_error ("io_kind_name(): bad I/O-kind");
2316 /* Match an IO iteration statement of the form:
2318 ( [<IO element> ,] <IO element>, I = <expr>, <expr> [, <expr> ] )
2320 which is equivalent to a single IO element. This function is
2321 mutually recursive with match_io_element(). */
2323 static match match_io_element (io_kind k, gfc_code **);
2326 match_io_iterator (io_kind k, gfc_code ** result)
2328 gfc_code *head, *tail, *new;
2336 old_loc = gfc_current_locus;
2338 if (gfc_match_char ('(') != MATCH_YES)
2341 m = match_io_element (k, &head);
2344 if (m != MATCH_YES || gfc_match_char (',') != MATCH_YES)
2350 /* Can't be anything but an IO iterator. Build a list. */
2351 iter = gfc_get_iterator ();
2355 m = gfc_match_iterator (iter, 0);
2356 if (m == MATCH_ERROR)
2360 gfc_check_do_variable (iter->var->symtree);
2364 m = match_io_element (k, &new);
2365 if (m == MATCH_ERROR)
2374 tail = gfc_append_code (tail, new);
2376 if (gfc_match_char (',') != MATCH_YES)
2385 if (gfc_match_char (')') != MATCH_YES)
2388 new = gfc_get_code ();
2390 new->ext.iterator = iter;
2392 new->block = gfc_get_code ();
2393 new->block->op = EXEC_DO;
2394 new->block->next = head;
2400 gfc_error ("Syntax error in I/O iterator at %C");
2404 gfc_free_iterator (iter, 1);
2405 gfc_free_statements (head);
2406 gfc_current_locus = old_loc;
2411 /* Match a single element of an IO list, which is either a single
2412 expression or an IO Iterator. */
2415 match_io_element (io_kind k, gfc_code ** cpp)
2423 m = match_io_iterator (k, cpp);
2429 m = gfc_match_variable (&expr, 0);
2431 gfc_error ("Expected variable in READ statement at %C");
2435 m = gfc_match_expr (&expr);
2437 gfc_error ("Expected expression in %s statement at %C",
2445 if (expr->symtree->n.sym->attr.intent == INTENT_IN)
2448 ("Variable '%s' in input list at %C cannot be INTENT(IN)",
2449 expr->symtree->n.sym->name);
2454 && gfc_impure_variable (expr->symtree->n.sym)
2455 && current_dt->io_unit->ts.type == BT_CHARACTER)
2457 gfc_error ("Cannot read to variable '%s' in PURE procedure at %C",
2458 expr->symtree->n.sym->name);
2462 if (gfc_check_do_variable (expr->symtree))
2468 if (current_dt->io_unit->ts.type == BT_CHARACTER
2470 && current_dt->io_unit->expr_type == EXPR_VARIABLE
2471 && gfc_impure_variable (current_dt->io_unit->symtree->n.sym))
2474 ("Cannot write to internal file unit '%s' at %C inside a "
2475 "PURE procedure", current_dt->io_unit->symtree->n.sym->name);
2487 gfc_free_expr (expr);
2491 cp = gfc_get_code ();
2492 cp->op = EXEC_TRANSFER;
2500 /* Match an I/O list, building gfc_code structures as we go. */
2503 match_io_list (io_kind k, gfc_code ** head_p)
2505 gfc_code *head, *tail, *new;
2508 *head_p = head = tail = NULL;
2509 if (gfc_match_eos () == MATCH_YES)
2514 m = match_io_element (k, &new);
2515 if (m == MATCH_ERROR)
2520 tail = gfc_append_code (tail, new);
2524 if (gfc_match_eos () == MATCH_YES)
2526 if (gfc_match_char (',') != MATCH_YES)
2534 gfc_error ("Syntax error in %s statement at %C", io_kind_name (k));
2537 gfc_free_statements (head);
2542 /* Attach the data transfer end node. */
2545 terminate_io (gfc_code * io_code)
2549 if (io_code == NULL)
2550 io_code = new_st.block;
2552 c = gfc_get_code ();
2553 c->op = EXEC_DT_END;
2555 /* Point to structure that is already there */
2556 c->ext.dt = new_st.ext.dt;
2557 gfc_append_code (io_code, c);
2561 /* Check the constraints for a data transfer statement. The majority of the
2562 constraints appearing in 9.4 of the standard appear here. Some are handled
2563 in resolve_tag and others in gfc_resolve_dt. */
2566 check_io_constraints (io_kind k, gfc_dt *dt, gfc_code * io_code, locus * spec_end)
2568 #define io_constraint(condition,msg,arg)\
2571 gfc_error(msg,arg);\
2577 gfc_symbol * sym = NULL;
2582 if (expr && expr->expr_type == EXPR_VARIABLE
2583 && expr->ts.type == BT_CHARACTER)
2585 sym = expr->symtree->n.sym;
2587 io_constraint (k == M_WRITE && sym->attr.intent == INTENT_IN,
2588 "Internal file at %L must not be INTENT(IN)",
2591 io_constraint (gfc_has_vector_index (dt->io_unit),
2592 "Internal file incompatible with vector subscript at %L",
2595 io_constraint (dt->rec != NULL,
2596 "REC tag at %L is incompatible with internal file",
2599 io_constraint (dt->namelist != NULL,
2600 "Internal file at %L is incompatible with namelist",
2603 io_constraint (dt->advance != NULL,
2604 "ADVANCE tag at %L is incompatible with internal file",
2605 &dt->advance->where);
2608 if (expr && expr->ts.type != BT_CHARACTER)
2611 io_constraint (gfc_pure (NULL)
2612 && (k == M_READ || k == M_WRITE),
2613 "IO UNIT in %s statement at %C must be "
2614 "an internal file in a PURE procedure",
2621 io_constraint (dt->end,
2622 "END tag not allowed with output at %L",
2625 io_constraint (dt->eor,
2626 "EOR tag not allowed with output at %L",
2629 io_constraint (k != M_READ && dt->size,
2630 "SIZE=specifier not allowed with output at %L",
2635 io_constraint (dt->size && dt->advance == NULL,
2636 "SIZE tag at %L requires an ADVANCE tag",
2639 io_constraint (dt->eor && dt->advance == NULL,
2640 "EOR tag at %L requires an ADVANCE tag",
2648 io_constraint (io_code && dt->namelist,
2649 "NAMELIST cannot be followed by IO-list at %L",
2652 io_constraint (dt->format_expr,
2653 "IO spec-list cannot contain both NAMELIST group name "
2654 "and format specification at %L.",
2655 &dt->format_expr->where);
2657 io_constraint (dt->format_label,
2658 "IO spec-list cannot contain both NAMELIST group name "
2659 "and format label at %L", spec_end);
2661 io_constraint (dt->rec,
2662 "NAMELIST IO is not allowed with a REC=specifier "
2663 "at %L.", &dt->rec->where);
2665 io_constraint (dt->advance,
2666 "NAMELIST IO is not allowed with a ADVANCE=specifier "
2667 "at %L.", &dt->advance->where);
2672 io_constraint (dt->end,
2673 "An END tag is not allowed with a "
2674 "REC=specifier at %L.", &dt->end_where);
2677 io_constraint (dt->format_label == &format_asterisk,
2678 "FMT=* is not allowed with a REC=specifier "
2679 "at %L.", spec_end);
2684 int not_yes, not_no;
2687 io_constraint (dt->format_label == &format_asterisk,
2688 "List directed format(*) is not allowed with a "
2689 "ADVANCE=specifier at %L.", &expr->where);
2691 io_constraint (dt->format_expr == NULL
2692 && dt->format_label == NULL
2693 && dt->namelist == NULL,
2694 "the ADVANCE=specifier at %L must appear with an "
2695 "explicit format expression", &expr->where);
2697 if (expr->expr_type == EXPR_CONSTANT && expr->ts.type == BT_CHARACTER)
2699 const char * advance = expr->value.character.string;
2700 not_no = strncasecmp (advance, "no", 2) != 0;
2701 not_yes = strncasecmp (advance, "yes", 2) != 0;
2709 io_constraint (not_no && not_yes,
2710 "ADVANCE=specifier at %L must have value = "
2711 "YES or NO.", &expr->where);
2713 io_constraint (dt->size && not_no && k == M_READ,
2714 "SIZE tag at %L requires an ADVANCE = 'NO'",
2717 io_constraint (dt->eor && not_no && k == M_READ,
2718 "EOR tag at %L requires an ADVANCE = 'NO'",
2722 expr = dt->format_expr;
2723 if (expr != NULL && expr->expr_type == EXPR_CONSTANT)
2724 check_format_string (expr);
2728 #undef io_constraint
2730 /* Match a READ, WRITE or PRINT statement. */
2733 match_io (io_kind k)
2735 char name[GFC_MAX_SYMBOL_LEN + 1];
2744 where = gfc_current_locus;
2746 current_dt = dt = gfc_getmem (sizeof (gfc_dt));
2747 m = gfc_match_char ('(');
2750 where = gfc_current_locus;
2753 else if (k == M_PRINT)
2755 /* Treat the non-standard case of PRINT namelist. */
2756 if ((gfc_current_form == FORM_FIXED || gfc_peek_char () == ' ')
2757 && gfc_match_name (name) == MATCH_YES)
2759 gfc_find_symbol (name, NULL, 1, &sym);
2760 if (sym && sym->attr.flavor == FL_NAMELIST)
2762 if (gfc_notify_std (GFC_STD_GNU, "PRINT namelist at "
2763 "%C is an extension") == FAILURE)
2769 dt->io_unit = default_unit (k);
2774 gfc_current_locus = where;
2778 if (gfc_current_form == FORM_FREE)
2780 c = gfc_peek_char();
2781 if (c != ' ' && c != '*' && c != '\'' && c != '"')
2788 m = match_dt_format (dt);
2789 if (m == MATCH_ERROR)
2795 dt->io_unit = default_unit (k);
2800 /* Before issuing an error for a malformed 'print (1,*)' type of
2801 error, check for a default-char-expr of the form ('(I0)'). */
2803 if (k == M_PRINT && m == MATCH_YES)
2805 /* Reset current locus to get the initial '(' in an expression. */
2806 gfc_current_locus = where;
2807 dt->format_expr = NULL;
2808 m = match_dt_format (dt);
2810 if (m == MATCH_ERROR)
2812 if (m == MATCH_NO || dt->format_expr == NULL)
2816 dt->io_unit = default_unit (k);
2821 /* Match a control list */
2822 if (match_dt_element (k, dt) == MATCH_YES)
2824 if (match_dt_unit (k, dt) != MATCH_YES)
2827 if (gfc_match_char (')') == MATCH_YES)
2829 if (gfc_match_char (',') != MATCH_YES)
2832 m = match_dt_element (k, dt);
2835 if (m == MATCH_ERROR)
2838 m = match_dt_format (dt);
2841 if (m == MATCH_ERROR)
2844 where = gfc_current_locus;
2846 m = gfc_match_name (name);
2849 gfc_find_symbol (name, NULL, 1, &sym);
2850 if (sym && sym->attr.flavor == FL_NAMELIST)
2853 if (k == M_READ && check_namelist (sym))
2862 gfc_current_locus = where;
2864 goto loop; /* No matches, try regular elements */
2867 if (gfc_match_char (')') == MATCH_YES)
2869 if (gfc_match_char (',') != MATCH_YES)
2875 m = match_dt_element (k, dt);
2878 if (m == MATCH_ERROR)
2881 if (gfc_match_char (')') == MATCH_YES)
2883 if (gfc_match_char (',') != MATCH_YES)
2889 /* Used in check_io_constraints, where no locus is available. */
2890 spec_end = gfc_current_locus;
2892 /* Optional leading comma (non-standard). */
2894 && gfc_match_char (',') == MATCH_YES
2896 && gfc_notify_std (GFC_STD_GNU, "Extension: Comma before output "
2897 "item list at %C is an extension") == FAILURE)
2901 if (gfc_match_eos () != MATCH_YES)
2903 if (comma_flag && gfc_match_char (',') != MATCH_YES)
2905 gfc_error ("Expected comma in I/O list at %C");
2910 m = match_io_list (k, &io_code);
2911 if (m == MATCH_ERROR)
2917 /* A full IO statement has been matched. Check the constraints. spec_end is
2918 supplied for cases where no locus is supplied. */
2919 m = check_io_constraints (k, dt, io_code, &spec_end);
2921 if (m == MATCH_ERROR)
2924 new_st.op = (k == M_READ) ? EXEC_READ : EXEC_WRITE;
2926 new_st.block = gfc_get_code ();
2927 new_st.block->op = new_st.op;
2928 new_st.block->next = io_code;
2930 terminate_io (io_code);
2935 gfc_error ("Syntax error in %s statement at %C", io_kind_name (k));
2945 gfc_match_read (void)
2947 return match_io (M_READ);
2951 gfc_match_write (void)
2953 return match_io (M_WRITE);
2957 gfc_match_print (void)
2961 m = match_io (M_PRINT);
2965 if (gfc_pure (NULL))
2967 gfc_error ("PRINT statement at %C not allowed within PURE procedure");
2975 /* Free a gfc_inquire structure. */
2978 gfc_free_inquire (gfc_inquire * inquire)
2981 if (inquire == NULL)
2984 gfc_free_expr (inquire->unit);
2985 gfc_free_expr (inquire->file);
2986 gfc_free_expr (inquire->iomsg);
2987 gfc_free_expr (inquire->iostat);
2988 gfc_free_expr (inquire->exist);
2989 gfc_free_expr (inquire->opened);
2990 gfc_free_expr (inquire->number);
2991 gfc_free_expr (inquire->named);
2992 gfc_free_expr (inquire->name);
2993 gfc_free_expr (inquire->access);
2994 gfc_free_expr (inquire->sequential);
2995 gfc_free_expr (inquire->direct);
2996 gfc_free_expr (inquire->form);
2997 gfc_free_expr (inquire->formatted);
2998 gfc_free_expr (inquire->unformatted);
2999 gfc_free_expr (inquire->recl);
3000 gfc_free_expr (inquire->nextrec);
3001 gfc_free_expr (inquire->blank);
3002 gfc_free_expr (inquire->position);
3003 gfc_free_expr (inquire->action);
3004 gfc_free_expr (inquire->read);
3005 gfc_free_expr (inquire->write);
3006 gfc_free_expr (inquire->readwrite);
3007 gfc_free_expr (inquire->delim);
3008 gfc_free_expr (inquire->pad);
3009 gfc_free_expr (inquire->iolength);
3010 gfc_free_expr (inquire->convert);
3011 gfc_free_expr (inquire->strm_pos);
3017 /* Match an element of an INQUIRE statement. */
3019 #define RETM if (m != MATCH_NO) return m;
3022 match_inquire_element (gfc_inquire * inquire)
3026 m = match_etag (&tag_unit, &inquire->unit);
3027 RETM m = match_etag (&tag_file, &inquire->file);
3028 RETM m = match_ltag (&tag_err, &inquire->err);
3029 RETM m = match_out_tag (&tag_iomsg, &inquire->iomsg);
3030 RETM m = match_out_tag (&tag_iostat, &inquire->iostat);
3031 RETM m = match_vtag (&tag_exist, &inquire->exist);
3032 RETM m = match_vtag (&tag_opened, &inquire->opened);
3033 RETM m = match_vtag (&tag_named, &inquire->named);
3034 RETM m = match_vtag (&tag_name, &inquire->name);
3035 RETM m = match_out_tag (&tag_number, &inquire->number);
3036 RETM m = match_vtag (&tag_s_access, &inquire->access);
3037 RETM m = match_vtag (&tag_sequential, &inquire->sequential);
3038 RETM m = match_vtag (&tag_direct, &inquire->direct);
3039 RETM m = match_vtag (&tag_s_form, &inquire->form);
3040 RETM m = match_vtag (&tag_formatted, &inquire->formatted);
3041 RETM m = match_vtag (&tag_unformatted, &inquire->unformatted);
3042 RETM m = match_out_tag (&tag_s_recl, &inquire->recl);
3043 RETM m = match_out_tag (&tag_nextrec, &inquire->nextrec);
3044 RETM m = match_vtag (&tag_s_blank, &inquire->blank);
3045 RETM m = match_vtag (&tag_s_position, &inquire->position);
3046 RETM m = match_vtag (&tag_s_action, &inquire->action);
3047 RETM m = match_vtag (&tag_read, &inquire->read);
3048 RETM m = match_vtag (&tag_write, &inquire->write);
3049 RETM m = match_vtag (&tag_readwrite, &inquire->readwrite);
3050 RETM m = match_vtag (&tag_s_delim, &inquire->delim);
3051 RETM m = match_vtag (&tag_s_pad, &inquire->pad);
3052 RETM m = match_vtag (&tag_iolength, &inquire->iolength);
3053 RETM m = match_vtag (&tag_convert, &inquire->convert);
3054 RETM m = match_out_tag (&tag_strm_out, &inquire->strm_pos);
3055 RETM return MATCH_NO;
3062 gfc_match_inquire (void)
3064 gfc_inquire *inquire;
3069 m = gfc_match_char ('(');
3073 inquire = gfc_getmem (sizeof (gfc_inquire));
3075 loc = gfc_current_locus;
3077 m = match_inquire_element (inquire);
3078 if (m == MATCH_ERROR)
3082 m = gfc_match_expr (&inquire->unit);
3083 if (m == MATCH_ERROR)
3089 /* See if we have the IOLENGTH form of the inquire statement. */
3090 if (inquire->iolength != NULL)
3092 if (gfc_match_char (')') != MATCH_YES)
3095 m = match_io_list (M_INQUIRE, &code);
3096 if (m == MATCH_ERROR)
3101 new_st.op = EXEC_IOLENGTH;
3102 new_st.expr = inquire->iolength;
3103 new_st.ext.inquire = inquire;
3105 if (gfc_pure (NULL))
3107 gfc_free_statements (code);
3108 gfc_error ("INQUIRE statement not allowed in PURE procedure at %C");
3112 new_st.block = gfc_get_code ();
3113 new_st.block->op = EXEC_IOLENGTH;
3114 terminate_io (code);
3115 new_st.block->next = code;
3119 /* At this point, we have the non-IOLENGTH inquire statement. */
3122 if (gfc_match_char (')') == MATCH_YES)
3124 if (gfc_match_char (',') != MATCH_YES)
3127 m = match_inquire_element (inquire);
3128 if (m == MATCH_ERROR)
3133 if (inquire->iolength != NULL)
3135 gfc_error ("IOLENGTH tag invalid in INQUIRE statement at %C");
3140 if (gfc_match_eos () != MATCH_YES)
3143 if (inquire->unit != NULL && inquire->file != NULL)
3145 gfc_error ("INQUIRE statement at %L cannot contain both FILE and"
3146 " UNIT specifiers", &loc);
3150 if (inquire->unit == NULL && inquire->file == NULL)
3152 gfc_error ("INQUIRE statement at %L requires either FILE or"
3153 " UNIT specifier", &loc);
3157 if (gfc_pure (NULL))
3159 gfc_error ("INQUIRE statement not allowed in PURE procedure at %C");
3163 new_st.op = EXEC_INQUIRE;
3164 new_st.ext.inquire = inquire;
3168 gfc_syntax_error (ST_INQUIRE);
3171 gfc_free_inquire (inquire);
3176 /* Resolve everything in a gfc_inquire structure. */
3179 gfc_resolve_inquire (gfc_inquire * inquire)
3182 RESOLVE_TAG (&tag_unit, inquire->unit);
3183 RESOLVE_TAG (&tag_file, inquire->file);
3184 RESOLVE_TAG (&tag_iomsg, inquire->iomsg);
3185 RESOLVE_TAG (&tag_iostat, inquire->iostat);
3186 RESOLVE_TAG (&tag_exist, inquire->exist);
3187 RESOLVE_TAG (&tag_opened, inquire->opened);
3188 RESOLVE_TAG (&tag_number, inquire->number);
3189 RESOLVE_TAG (&tag_named, inquire->named);
3190 RESOLVE_TAG (&tag_name, inquire->name);
3191 RESOLVE_TAG (&tag_s_access, inquire->access);
3192 RESOLVE_TAG (&tag_sequential, inquire->sequential);
3193 RESOLVE_TAG (&tag_direct, inquire->direct);
3194 RESOLVE_TAG (&tag_s_form, inquire->form);
3195 RESOLVE_TAG (&tag_formatted, inquire->formatted);
3196 RESOLVE_TAG (&tag_unformatted, inquire->unformatted);
3197 RESOLVE_TAG (&tag_s_recl, inquire->recl);
3198 RESOLVE_TAG (&tag_nextrec, inquire->nextrec);
3199 RESOLVE_TAG (&tag_s_blank, inquire->blank);
3200 RESOLVE_TAG (&tag_s_position, inquire->position);
3201 RESOLVE_TAG (&tag_s_action, inquire->action);
3202 RESOLVE_TAG (&tag_read, inquire->read);
3203 RESOLVE_TAG (&tag_write, inquire->write);
3204 RESOLVE_TAG (&tag_readwrite, inquire->readwrite);
3205 RESOLVE_TAG (&tag_s_delim, inquire->delim);
3206 RESOLVE_TAG (&tag_s_pad, inquire->pad);
3207 RESOLVE_TAG (&tag_iolength, inquire->iolength);
3208 RESOLVE_TAG (&tag_convert, inquire->convert);
3209 RESOLVE_TAG (&tag_strm_out, inquire->strm_pos);
3211 if (gfc_reference_st_label (inquire->err, ST_LABEL_TARGET) == FAILURE)