1 /* Primary expression subroutines
2 Copyright (C) 2000, 2001, 2002, 2004, 2005, 2006, 2007, 2008
3 Free Software Foundation, Inc.
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 3, 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 COPYING3. If not see
20 <http://www.gnu.org/licenses/>. */
31 /* Matches a kind-parameter expression, which is either a named
32 symbolic constant or a nonnegative integer constant. If
33 successful, sets the kind value to the correct integer. */
36 match_kind_param (int *kind)
38 char name[GFC_MAX_SYMBOL_LEN + 1];
43 m = gfc_match_small_literal_int (kind, NULL);
47 m = gfc_match_name (name);
51 if (gfc_find_symbol (name, NULL, 1, &sym))
57 if (sym->attr.flavor != FL_PARAMETER)
60 p = gfc_extract_int (sym->value, kind);
64 gfc_set_sym_referenced (sym);
73 /* Get a trailing kind-specification for non-character variables.
75 the integer kind value or:
76 -1 if an error was generated
77 -2 if no kind was found */
85 if (gfc_match_char ('_') != MATCH_YES)
88 m = match_kind_param (&kind);
90 gfc_error ("Missing kind-parameter at %C");
92 return (m == MATCH_YES) ? kind : -1;
96 /* Given a character and a radix, see if the character is a valid
97 digit in that radix. */
100 gfc_check_digit (char c, int radix)
107 r = ('0' <= c && c <= '1');
111 r = ('0' <= c && c <= '7');
115 r = ('0' <= c && c <= '9');
123 gfc_internal_error ("gfc_check_digit(): bad radix");
130 /* Match the digit string part of an integer if signflag is not set,
131 the signed digit string part if signflag is set. If the buffer
132 is NULL, we just count characters for the resolution pass. Returns
133 the number of characters matched, -1 for no match. */
136 match_digits (int signflag, int radix, char *buffer)
143 c = gfc_next_ascii_char ();
145 if (signflag && (c == '+' || c == '-'))
149 gfc_gobble_whitespace ();
150 c = gfc_next_ascii_char ();
154 if (!gfc_check_digit (c, radix))
163 old_loc = gfc_current_locus;
164 c = gfc_next_ascii_char ();
166 if (!gfc_check_digit (c, radix))
174 gfc_current_locus = old_loc;
180 /* Match an integer (digit string and optional kind).
181 A sign will be accepted if signflag is set. */
184 match_integer_constant (gfc_expr **result, int signflag)
191 old_loc = gfc_current_locus;
192 gfc_gobble_whitespace ();
194 length = match_digits (signflag, 10, NULL);
195 gfc_current_locus = old_loc;
199 buffer = (char *) alloca (length + 1);
200 memset (buffer, '\0', length + 1);
202 gfc_gobble_whitespace ();
204 match_digits (signflag, 10, buffer);
208 kind = gfc_default_integer_kind;
212 if (gfc_validate_kind (BT_INTEGER, kind, true) < 0)
214 gfc_error ("Integer kind %d at %C not available", kind);
218 e = gfc_convert_integer (buffer, kind, 10, &gfc_current_locus);
220 if (gfc_range_check (e) != ARITH_OK)
222 gfc_error ("Integer too big for its kind at %C. This check can be "
223 "disabled with the option -fno-range-check");
234 /* Match a Hollerith constant. */
237 match_hollerith_constant (gfc_expr **result)
245 old_loc = gfc_current_locus;
246 gfc_gobble_whitespace ();
248 if (match_integer_constant (&e, 0) == MATCH_YES
249 && gfc_match_char ('h') == MATCH_YES)
251 if (gfc_notify_std (GFC_STD_LEGACY, "Extension: Hollerith constant "
255 msg = gfc_extract_int (e, &num);
263 gfc_error ("Invalid Hollerith constant: %L must contain at least "
264 "one character", &old_loc);
267 if (e->ts.kind != gfc_default_integer_kind)
269 gfc_error ("Invalid Hollerith constant: Integer kind at %L "
270 "should be default", &old_loc);
276 e = gfc_constant_result (BT_HOLLERITH, gfc_default_character_kind,
279 e->representation.string = XCNEWVEC (char, num + 1);
281 for (i = 0; i < num; i++)
283 gfc_char_t c = gfc_next_char_literal (1);
284 if (! gfc_wide_fits_in_byte (c))
286 gfc_error ("Invalid Hollerith constant at %L contains a "
287 "wide character", &old_loc);
291 e->representation.string[i] = (unsigned char) c;
294 e->representation.string[num] = '\0';
295 e->representation.length = num;
303 gfc_current_locus = old_loc;
312 /* Match a binary, octal or hexadecimal constant that can be found in
313 a DATA statement. The standard permits b'010...', o'73...', and
314 z'a1...' where b, o, and z can be capital letters. This function
315 also accepts postfixed forms of the constants: '01...'b, '73...'o,
316 and 'a1...'z. An additional extension is the use of x for z. */
319 match_boz_constant (gfc_expr **result)
321 int radix, length, x_hex, kind;
322 locus old_loc, start_loc;
323 char *buffer, post, delim;
326 start_loc = old_loc = gfc_current_locus;
327 gfc_gobble_whitespace ();
330 switch (post = gfc_next_ascii_char ())
352 radix = 16; /* Set to accept any valid digit string. */
358 /* No whitespace allowed here. */
361 delim = gfc_next_ascii_char ();
363 if (delim != '\'' && delim != '\"')
367 && (gfc_notify_std (GFC_STD_GNU, "Extension: Hexadecimal "
368 "constant at %C uses non-standard syntax")
372 old_loc = gfc_current_locus;
374 length = match_digits (0, radix, NULL);
377 gfc_error ("Empty set of digits in BOZ constant at %C");
381 if (gfc_next_ascii_char () != delim)
383 gfc_error ("Illegal character in BOZ constant at %C");
389 switch (gfc_next_ascii_char ())
406 if (gfc_notify_std (GFC_STD_GNU, "Extension: BOZ constant "
407 "at %C uses non-standard postfix syntax")
412 gfc_current_locus = old_loc;
414 buffer = (char *) alloca (length + 1);
415 memset (buffer, '\0', length + 1);
417 match_digits (0, radix, buffer);
418 gfc_next_ascii_char (); /* Eat delimiter. */
420 gfc_next_ascii_char (); /* Eat postfixed b, o, z, or x. */
422 /* In section 5.2.5 and following C567 in the Fortran 2003 standard, we find
423 "If a data-stmt-constant is a boz-literal-constant, the corresponding
424 variable shall be of type integer. The boz-literal-constant is treated
425 as if it were an int-literal-constant with a kind-param that specifies
426 the representation method with the largest decimal exponent range
427 supported by the processor." */
429 kind = gfc_max_integer_kind;
430 e = gfc_convert_integer (buffer, kind, radix, &gfc_current_locus);
432 /* Mark as boz variable. */
435 if (gfc_range_check (e) != ARITH_OK)
437 gfc_error ("Integer too big for integer kind %i at %C", kind);
442 if (!gfc_in_match_data ()
443 && (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: BOZ used outside a DATA "
452 gfc_current_locus = start_loc;
457 /* Match a real constant of some sort. Allow a signed constant if signflag
461 match_real_constant (gfc_expr **result, int signflag)
463 int kind, count, seen_dp, seen_digits;
464 locus old_loc, temp_loc;
465 char *p, *buffer, c, exp_char;
469 old_loc = gfc_current_locus;
470 gfc_gobble_whitespace ();
480 c = gfc_next_ascii_char ();
481 if (signflag && (c == '+' || c == '-'))
486 gfc_gobble_whitespace ();
487 c = gfc_next_ascii_char ();
490 /* Scan significand. */
491 for (;; c = gfc_next_ascii_char (), count++)
498 /* Check to see if "." goes with a following operator like
500 temp_loc = gfc_current_locus;
501 c = gfc_next_ascii_char ();
503 if (c == 'e' || c == 'd' || c == 'q')
505 c = gfc_next_ascii_char ();
507 goto done; /* Operator named .e. or .d. */
511 goto done; /* Distinguish 1.e9 from 1.eq.2 */
513 gfc_current_locus = temp_loc;
527 if (!seen_digits || (c != 'e' && c != 'd' && c != 'q'))
532 c = gfc_next_ascii_char ();
535 if (c == '+' || c == '-')
536 { /* optional sign */
537 c = gfc_next_ascii_char ();
543 gfc_error ("Missing exponent in real number at %C");
549 c = gfc_next_ascii_char ();
554 /* Check that we have a numeric constant. */
555 if (!seen_digits || (!seen_dp && exp_char == ' '))
557 gfc_current_locus = old_loc;
561 /* Convert the number. */
562 gfc_current_locus = old_loc;
563 gfc_gobble_whitespace ();
565 buffer = (char *) alloca (count + 1);
566 memset (buffer, '\0', count + 1);
569 c = gfc_next_ascii_char ();
570 if (c == '+' || c == '-')
572 gfc_gobble_whitespace ();
573 c = gfc_next_ascii_char ();
576 /* Hack for mpfr_set_str(). */
579 if (c == 'd' || c == 'q')
587 c = gfc_next_ascii_char ();
599 gfc_error ("Real number at %C has a 'd' exponent and an explicit "
603 kind = gfc_default_double_kind;
608 kind = gfc_default_real_kind;
610 if (gfc_validate_kind (BT_REAL, kind, true) < 0)
612 gfc_error ("Invalid real kind %d at %C", kind);
617 e = gfc_convert_real (buffer, kind, &gfc_current_locus);
619 mpfr_neg (e->value.real, e->value.real, GFC_RND_MODE);
621 switch (gfc_range_check (e))
626 gfc_error ("Real constant overflows its kind at %C");
629 case ARITH_UNDERFLOW:
630 if (gfc_option.warn_underflow)
631 gfc_warning ("Real constant underflows its kind at %C");
632 mpfr_set_ui (e->value.real, 0, GFC_RND_MODE);
636 gfc_internal_error ("gfc_range_check() returned bad value");
648 /* Match a substring reference. */
651 match_substring (gfc_charlen *cl, int init, gfc_ref **result)
653 gfc_expr *start, *end;
661 old_loc = gfc_current_locus;
663 m = gfc_match_char ('(');
667 if (gfc_match_char (':') != MATCH_YES)
670 m = gfc_match_init_expr (&start);
672 m = gfc_match_expr (&start);
680 m = gfc_match_char (':');
685 if (gfc_match_char (')') != MATCH_YES)
688 m = gfc_match_init_expr (&end);
690 m = gfc_match_expr (&end);
694 if (m == MATCH_ERROR)
697 m = gfc_match_char (')');
702 /* Optimize away the (:) reference. */
703 if (start == NULL && end == NULL)
707 ref = gfc_get_ref ();
709 ref->type = REF_SUBSTRING;
711 start = gfc_int_expr (1);
712 ref->u.ss.start = start;
713 if (end == NULL && cl)
714 end = gfc_copy_expr (cl->length);
716 ref->u.ss.length = cl;
723 gfc_error ("Syntax error in SUBSTRING specification at %C");
727 gfc_free_expr (start);
730 gfc_current_locus = old_loc;
735 /* Reads the next character of a string constant, taking care to
736 return doubled delimiters on the input as a single instance of
739 Special return values for "ret" argument are:
740 -1 End of the string, as determined by the delimiter
741 -2 Unterminated string detected
743 Backslash codes are also expanded at this time. */
746 next_string_char (gfc_char_t delimiter, int *ret)
751 c = gfc_next_char_literal (1);
760 if (gfc_option.flag_backslash && c == '\\')
762 old_locus = gfc_current_locus;
764 if (gfc_match_special_char (&c) == MATCH_NO)
765 gfc_current_locus = old_locus;
767 if (!(gfc_option.allow_std & GFC_STD_GNU) && !inhibit_warnings)
768 gfc_warning ("Extension: backslash character at %C");
774 old_locus = gfc_current_locus;
775 c = gfc_next_char_literal (0);
779 gfc_current_locus = old_locus;
786 /* Special case of gfc_match_name() that matches a parameter kind name
787 before a string constant. This takes case of the weird but legal
792 where kind____ is a parameter. gfc_match_name() will happily slurp
793 up all the underscores, which leads to problems. If we return
794 MATCH_YES, the parse pointer points to the final underscore, which
795 is not part of the name. We never return MATCH_ERROR-- errors in
796 the name will be detected later. */
799 match_charkind_name (char *name)
805 gfc_gobble_whitespace ();
806 c = gfc_next_ascii_char ();
815 old_loc = gfc_current_locus;
816 c = gfc_next_ascii_char ();
820 peek = gfc_peek_ascii_char ();
822 if (peek == '\'' || peek == '\"')
824 gfc_current_locus = old_loc;
832 && (gfc_option.flag_dollar_ok && c != '$'))
836 if (++len > GFC_MAX_SYMBOL_LEN)
844 /* See if the current input matches a character constant. Lots of
845 contortions have to be done to match the kind parameter which comes
846 before the actual string. The main consideration is that we don't
847 want to error out too quickly. For example, we don't actually do
848 any validation of the kinds until we have actually seen a legal
849 delimiter. Using match_kind_param() generates errors too quickly. */
852 match_string_constant (gfc_expr **result)
854 char name[GFC_MAX_SYMBOL_LEN + 1], peek;
855 int i, kind, length, warn_ampersand, ret;
856 locus old_locus, start_locus;
861 gfc_char_t c, delimiter, *p;
863 old_locus = gfc_current_locus;
865 gfc_gobble_whitespace ();
867 start_locus = gfc_current_locus;
869 c = gfc_next_char ();
870 if (c == '\'' || c == '"')
872 kind = gfc_default_character_kind;
876 if (gfc_wide_is_digit (c))
880 while (gfc_wide_is_digit (c))
882 kind = kind * 10 + c - '0';
885 c = gfc_next_char ();
891 gfc_current_locus = old_locus;
893 m = match_charkind_name (name);
897 if (gfc_find_symbol (name, NULL, 1, &sym)
899 || sym->attr.flavor != FL_PARAMETER)
903 c = gfc_next_char ();
908 gfc_gobble_whitespace ();
909 c = gfc_next_char ();
915 gfc_gobble_whitespace ();
916 start_locus = gfc_current_locus;
918 c = gfc_next_char ();
919 if (c != '\'' && c != '"')
924 q = gfc_extract_int (sym->value, &kind);
930 gfc_set_sym_referenced (sym);
933 if (gfc_validate_kind (BT_CHARACTER, kind, true) < 0)
935 gfc_error ("Invalid kind %d for CHARACTER constant at %C", kind);
940 /* Scan the string into a block of memory by first figuring out how
941 long it is, allocating the structure, then re-reading it. This
942 isn't particularly efficient, but string constants aren't that
943 common in most code. TODO: Use obstacks? */
950 c = next_string_char (delimiter, &ret);
955 gfc_current_locus = start_locus;
956 gfc_error ("Unterminated character constant beginning at %C");
963 /* Peek at the next character to see if it is a b, o, z, or x for the
964 postfixed BOZ literal constants. */
965 peek = gfc_peek_ascii_char ();
966 if (peek == 'b' || peek == 'o' || peek =='z' || peek == 'x')
972 e->expr_type = EXPR_CONSTANT;
974 e->ts.type = BT_CHARACTER;
976 e->ts.is_c_interop = 0;
978 e->where = start_locus;
980 e->value.character.string = p = gfc_get_wide_string (length + 1);
981 e->value.character.length = length;
983 gfc_current_locus = start_locus;
984 gfc_next_char (); /* Skip delimiter */
986 /* We disable the warning for the following loop as the warning has already
987 been printed in the loop above. */
988 warn_ampersand = gfc_option.warn_ampersand;
989 gfc_option.warn_ampersand = 0;
991 for (i = 0; i < length; i++)
993 c = next_string_char (delimiter, &ret);
995 if (!gfc_check_character_range (c, kind))
997 gfc_error ("Character '%s' in string at %C is not representable "
998 "in character kind %d", gfc_print_wide_char (c), kind);
1005 *p = '\0'; /* TODO: C-style string is for development/debug purposes. */
1006 gfc_option.warn_ampersand = warn_ampersand;
1008 next_string_char (delimiter, &ret);
1010 gfc_internal_error ("match_string_constant(): Delimiter not found");
1012 if (match_substring (NULL, 0, &e->ref) != MATCH_NO)
1013 e->expr_type = EXPR_SUBSTRING;
1020 gfc_current_locus = old_locus;
1025 /* Match a .true. or .false. Returns 1 if a .true. was found,
1026 0 if a .false. was found, and -1 otherwise. */
1028 match_logical_constant_string (void)
1030 locus orig_loc = gfc_current_locus;
1032 gfc_gobble_whitespace ();
1033 if (gfc_next_ascii_char () == '.')
1035 char ch = gfc_next_ascii_char ();
1038 if (gfc_next_ascii_char () == 'a'
1039 && gfc_next_ascii_char () == 'l'
1040 && gfc_next_ascii_char () == 's'
1041 && gfc_next_ascii_char () == 'e'
1042 && gfc_next_ascii_char () == '.')
1043 /* Matched ".false.". */
1048 if (gfc_next_ascii_char () == 'r'
1049 && gfc_next_ascii_char () == 'u'
1050 && gfc_next_ascii_char () == 'e'
1051 && gfc_next_ascii_char () == '.')
1052 /* Matched ".true.". */
1056 gfc_current_locus = orig_loc;
1060 /* Match a .true. or .false. */
1063 match_logical_constant (gfc_expr **result)
1068 i = match_logical_constant_string ();
1076 kind = gfc_default_logical_kind;
1078 if (gfc_validate_kind (BT_LOGICAL, kind, true) < 0)
1080 gfc_error ("Bad kind for logical constant at %C");
1084 e = gfc_get_expr ();
1086 e->expr_type = EXPR_CONSTANT;
1087 e->value.logical = i;
1088 e->ts.type = BT_LOGICAL;
1090 e->ts.is_c_interop = 0;
1092 e->where = gfc_current_locus;
1099 /* Match a real or imaginary part of a complex constant that is a
1100 symbolic constant. */
1103 match_sym_complex_part (gfc_expr **result)
1105 char name[GFC_MAX_SYMBOL_LEN + 1];
1110 m = gfc_match_name (name);
1114 if (gfc_find_symbol (name, NULL, 1, &sym) || sym == NULL)
1117 if (sym->attr.flavor != FL_PARAMETER)
1119 gfc_error ("Expected PARAMETER symbol in complex constant at %C");
1123 if (!gfc_numeric_ts (&sym->value->ts))
1125 gfc_error ("Numeric PARAMETER required in complex constant at %C");
1129 if (sym->value->rank != 0)
1131 gfc_error ("Scalar PARAMETER required in complex constant at %C");
1135 if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: PARAMETER symbol in "
1136 "complex constant at %C") == FAILURE)
1139 switch (sym->value->ts.type)
1142 e = gfc_copy_expr (sym->value);
1146 e = gfc_complex2real (sym->value, sym->value->ts.kind);
1152 e = gfc_int2real (sym->value, gfc_default_real_kind);
1158 gfc_internal_error ("gfc_match_sym_complex_part(): Bad type");
1161 *result = e; /* e is a scalar, real, constant expression. */
1165 gfc_error ("Error converting PARAMETER constant in complex constant at %C");
1170 /* Match a real or imaginary part of a complex number. */
1173 match_complex_part (gfc_expr **result)
1177 m = match_sym_complex_part (result);
1181 m = match_real_constant (result, 1);
1185 return match_integer_constant (result, 1);
1189 /* Try to match a complex constant. */
1192 match_complex_constant (gfc_expr **result)
1194 gfc_expr *e, *real, *imag;
1195 gfc_error_buf old_error;
1196 gfc_typespec target;
1201 old_loc = gfc_current_locus;
1202 real = imag = e = NULL;
1204 m = gfc_match_char ('(');
1208 gfc_push_error (&old_error);
1210 m = match_complex_part (&real);
1213 gfc_free_error (&old_error);
1217 if (gfc_match_char (',') == MATCH_NO)
1219 gfc_pop_error (&old_error);
1224 /* If m is error, then something was wrong with the real part and we
1225 assume we have a complex constant because we've seen the ','. An
1226 ambiguous case here is the start of an iterator list of some
1227 sort. These sort of lists are matched prior to coming here. */
1229 if (m == MATCH_ERROR)
1231 gfc_free_error (&old_error);
1234 gfc_pop_error (&old_error);
1236 m = match_complex_part (&imag);
1239 if (m == MATCH_ERROR)
1242 m = gfc_match_char (')');
1245 /* Give the matcher for implied do-loops a chance to run. This
1246 yields a much saner error message for (/ (i, 4=i, 6) /). */
1247 if (gfc_peek_ascii_char () == '=')
1256 if (m == MATCH_ERROR)
1259 /* Decide on the kind of this complex number. */
1260 if (real->ts.type == BT_REAL)
1262 if (imag->ts.type == BT_REAL)
1263 kind = gfc_kind_max (real, imag);
1265 kind = real->ts.kind;
1269 if (imag->ts.type == BT_REAL)
1270 kind = imag->ts.kind;
1272 kind = gfc_default_real_kind;
1274 target.type = BT_REAL;
1276 target.is_c_interop = 0;
1277 target.is_iso_c = 0;
1279 if (real->ts.type != BT_REAL || kind != real->ts.kind)
1280 gfc_convert_type (real, &target, 2);
1281 if (imag->ts.type != BT_REAL || kind != imag->ts.kind)
1282 gfc_convert_type (imag, &target, 2);
1284 e = gfc_convert_complex (real, imag, kind);
1285 e->where = gfc_current_locus;
1287 gfc_free_expr (real);
1288 gfc_free_expr (imag);
1294 gfc_error ("Syntax error in COMPLEX constant at %C");
1299 gfc_free_expr (real);
1300 gfc_free_expr (imag);
1301 gfc_current_locus = old_loc;
1307 /* Match constants in any of several forms. Returns nonzero for a
1308 match, zero for no match. */
1311 gfc_match_literal_constant (gfc_expr **result, int signflag)
1315 m = match_complex_constant (result);
1319 m = match_string_constant (result);
1323 m = match_boz_constant (result);
1327 m = match_real_constant (result, signflag);
1331 m = match_hollerith_constant (result);
1335 m = match_integer_constant (result, signflag);
1339 m = match_logical_constant (result);
1347 /* Match a single actual argument value. An actual argument is
1348 usually an expression, but can also be a procedure name. If the
1349 argument is a single name, it is not always possible to tell
1350 whether the name is a dummy procedure or not. We treat these cases
1351 by creating an argument that looks like a dummy procedure and
1352 fixing things later during resolution. */
1355 match_actual_arg (gfc_expr **result)
1357 char name[GFC_MAX_SYMBOL_LEN + 1];
1358 gfc_symtree *symtree;
1363 where = gfc_current_locus;
1365 switch (gfc_match_name (name))
1374 w = gfc_current_locus;
1375 gfc_gobble_whitespace ();
1376 c = gfc_next_ascii_char ();
1377 gfc_current_locus = w;
1379 if (c != ',' && c != ')')
1382 if (gfc_find_sym_tree (name, NULL, 1, &symtree))
1384 /* Handle error elsewhere. */
1386 /* Eliminate a couple of common cases where we know we don't
1387 have a function argument. */
1388 if (symtree == NULL)
1390 gfc_get_sym_tree (name, NULL, &symtree);
1391 gfc_set_sym_referenced (symtree->n.sym);
1397 sym = symtree->n.sym;
1398 gfc_set_sym_referenced (sym);
1399 if (sym->attr.flavor != FL_PROCEDURE
1400 && sym->attr.flavor != FL_UNKNOWN)
1403 /* If the symbol is a function with itself as the result and
1404 is being defined, then we have a variable. */
1405 if (sym->attr.function && sym->result == sym)
1407 if (gfc_current_ns->proc_name == sym
1408 || (gfc_current_ns->parent != NULL
1409 && gfc_current_ns->parent->proc_name == sym))
1413 && (sym->ns == gfc_current_ns
1414 || sym->ns == gfc_current_ns->parent))
1416 gfc_entry_list *el = NULL;
1418 for (el = sym->ns->entries; el; el = el->next)
1428 e = gfc_get_expr (); /* Leave it unknown for now */
1429 e->symtree = symtree;
1430 e->expr_type = EXPR_VARIABLE;
1431 e->ts.type = BT_PROCEDURE;
1438 gfc_current_locus = where;
1439 return gfc_match_expr (result);
1443 /* Match a keyword argument. */
1446 match_keyword_arg (gfc_actual_arglist *actual, gfc_actual_arglist *base)
1448 char name[GFC_MAX_SYMBOL_LEN + 1];
1449 gfc_actual_arglist *a;
1453 name_locus = gfc_current_locus;
1454 m = gfc_match_name (name);
1458 if (gfc_match_char ('=') != MATCH_YES)
1464 m = match_actual_arg (&actual->expr);
1468 /* Make sure this name has not appeared yet. */
1470 if (name[0] != '\0')
1472 for (a = base; a; a = a->next)
1473 if (a->name != NULL && strcmp (a->name, name) == 0)
1475 gfc_error ("Keyword '%s' at %C has already appeared in the "
1476 "current argument list", name);
1481 actual->name = gfc_get_string (name);
1485 gfc_current_locus = name_locus;
1490 /* Match an argument list function, such as %VAL. */
1493 match_arg_list_function (gfc_actual_arglist *result)
1495 char name[GFC_MAX_SYMBOL_LEN + 1];
1499 old_locus = gfc_current_locus;
1501 if (gfc_match_char ('%') != MATCH_YES)
1507 m = gfc_match ("%n (", name);
1511 if (name[0] != '\0')
1516 if (strncmp (name, "loc", 3) == 0)
1518 result->name = "%LOC";
1522 if (strncmp (name, "ref", 3) == 0)
1524 result->name = "%REF";
1528 if (strncmp (name, "val", 3) == 0)
1530 result->name = "%VAL";
1539 if (gfc_notify_std (GFC_STD_GNU, "Extension: argument list "
1540 "function at %C") == FAILURE)
1546 m = match_actual_arg (&result->expr);
1550 if (gfc_match_char (')') != MATCH_YES)
1559 gfc_current_locus = old_locus;
1564 /* Matches an actual argument list of a function or subroutine, from
1565 the opening parenthesis to the closing parenthesis. The argument
1566 list is assumed to allow keyword arguments because we don't know if
1567 the symbol associated with the procedure has an implicit interface
1568 or not. We make sure keywords are unique. If sub_flag is set,
1569 we're matching the argument list of a subroutine. */
1572 gfc_match_actual_arglist (int sub_flag, gfc_actual_arglist **argp)
1574 gfc_actual_arglist *head, *tail;
1576 gfc_st_label *label;
1580 *argp = tail = NULL;
1581 old_loc = gfc_current_locus;
1585 if (gfc_match_char ('(') == MATCH_NO)
1586 return (sub_flag) ? MATCH_YES : MATCH_NO;
1588 if (gfc_match_char (')') == MATCH_YES)
1595 head = tail = gfc_get_actual_arglist ();
1598 tail->next = gfc_get_actual_arglist ();
1602 if (sub_flag && gfc_match_char ('*') == MATCH_YES)
1604 m = gfc_match_st_label (&label);
1606 gfc_error ("Expected alternate return label at %C");
1610 tail->label = label;
1614 /* After the first keyword argument is seen, the following
1615 arguments must also have keywords. */
1618 m = match_keyword_arg (tail, head);
1620 if (m == MATCH_ERROR)
1624 gfc_error ("Missing keyword name in actual argument list at %C");
1631 /* Try an argument list function, like %VAL. */
1632 m = match_arg_list_function (tail);
1633 if (m == MATCH_ERROR)
1636 /* See if we have the first keyword argument. */
1639 m = match_keyword_arg (tail, head);
1642 if (m == MATCH_ERROR)
1648 /* Try for a non-keyword argument. */
1649 m = match_actual_arg (&tail->expr);
1650 if (m == MATCH_ERROR)
1659 if (gfc_match_char (')') == MATCH_YES)
1661 if (gfc_match_char (',') != MATCH_YES)
1669 gfc_error ("Syntax error in argument list at %C");
1672 gfc_free_actual_arglist (head);
1673 gfc_current_locus = old_loc;
1679 /* Used by match_varspec() to extend the reference list by one
1683 extend_ref (gfc_expr *primary, gfc_ref *tail)
1685 if (primary->ref == NULL)
1686 primary->ref = tail = gfc_get_ref ();
1690 gfc_internal_error ("extend_ref(): Bad tail");
1691 tail->next = gfc_get_ref ();
1699 /* Match any additional specifications associated with the current
1700 variable like member references or substrings. If equiv_flag is
1701 set we only match stuff that is allowed inside an EQUIVALENCE
1705 match_varspec (gfc_expr *primary, int equiv_flag)
1707 char name[GFC_MAX_SYMBOL_LEN + 1];
1708 gfc_ref *substring, *tail;
1709 gfc_component *component;
1710 gfc_symbol *sym = primary->symtree->n.sym;
1716 gfc_gobble_whitespace ();
1717 if ((equiv_flag && gfc_peek_ascii_char () == '(') || sym->attr.dimension)
1719 /* In EQUIVALENCE, we don't know yet whether we are seeing
1720 an array, character variable or array of character
1721 variables. We'll leave the decision till resolve time. */
1722 tail = extend_ref (primary, tail);
1723 tail->type = REF_ARRAY;
1725 m = gfc_match_array_ref (&tail->u.ar, equiv_flag ? NULL : sym->as,
1730 gfc_gobble_whitespace ();
1731 if (equiv_flag && gfc_peek_ascii_char () == '(')
1733 tail = extend_ref (primary, tail);
1734 tail->type = REF_ARRAY;
1736 m = gfc_match_array_ref (&tail->u.ar, NULL, equiv_flag);
1742 primary->ts = sym->ts;
1747 if (sym->ts.type != BT_DERIVED || gfc_match_char ('%') != MATCH_YES)
1748 goto check_substring;
1750 sym = sym->ts.derived;
1754 m = gfc_match_name (name);
1756 gfc_error ("Expected structure component name at %C");
1760 component = gfc_find_component (sym, name);
1761 if (component == NULL)
1764 tail = extend_ref (primary, tail);
1765 tail->type = REF_COMPONENT;
1767 tail->u.c.component = component;
1768 tail->u.c.sym = sym;
1770 primary->ts = component->ts;
1772 if (component->as != NULL)
1774 tail = extend_ref (primary, tail);
1775 tail->type = REF_ARRAY;
1777 m = gfc_match_array_ref (&tail->u.ar, component->as, equiv_flag);
1782 if (component->ts.type != BT_DERIVED
1783 || gfc_match_char ('%') != MATCH_YES)
1786 sym = component->ts.derived;
1791 if (primary->ts.type == BT_UNKNOWN)
1793 if (gfc_get_default_type (sym, sym->ns)->type == BT_CHARACTER)
1795 gfc_set_default_type (sym, 0, sym->ns);
1796 primary->ts = sym->ts;
1801 if (primary->ts.type == BT_CHARACTER)
1803 switch (match_substring (primary->ts.cl, equiv_flag, &substring))
1807 primary->ref = substring;
1809 tail->next = substring;
1811 if (primary->expr_type == EXPR_CONSTANT)
1812 primary->expr_type = EXPR_SUBSTRING;
1815 primary->ts.cl = NULL;
1821 gfc_clear_ts (&primary->ts);
1833 /* Given an expression that is a variable, figure out what the
1834 ultimate variable's type and attribute is, traversing the reference
1835 structures if necessary.
1837 This subroutine is trickier than it looks. We start at the base
1838 symbol and store the attribute. Component references load a
1839 completely new attribute.
1841 A couple of rules come into play. Subobjects of targets are always
1842 targets themselves. If we see a component that goes through a
1843 pointer, then the expression must also be a target, since the
1844 pointer is associated with something (if it isn't core will soon be
1845 dumped). If we see a full part or section of an array, the
1846 expression is also an array.
1848 We can have at most one full array reference. */
1851 gfc_variable_attr (gfc_expr *expr, gfc_typespec *ts)
1853 int dimension, pointer, allocatable, target;
1854 symbol_attribute attr;
1857 if (expr->expr_type != EXPR_VARIABLE)
1858 gfc_internal_error ("gfc_variable_attr(): Expression isn't a variable");
1861 attr = expr->symtree->n.sym->attr;
1863 dimension = attr.dimension;
1864 pointer = attr.pointer;
1865 allocatable = attr.allocatable;
1867 target = attr.target;
1871 if (ts != NULL && expr->ts.type == BT_UNKNOWN)
1872 *ts = expr->symtree->n.sym->ts;
1874 for (; ref; ref = ref->next)
1879 switch (ref->u.ar.type)
1886 allocatable = pointer = 0;
1891 allocatable = pointer = 0;
1895 gfc_internal_error ("gfc_variable_attr(): Bad array reference");
1901 gfc_get_component_attr (&attr, ref->u.c.component);
1904 *ts = ref->u.c.component->ts;
1905 /* Don't set the string length if a substring reference
1907 if (ts->type == BT_CHARACTER
1908 && ref->next && ref->next->type == REF_SUBSTRING)
1912 pointer = ref->u.c.component->pointer;
1913 allocatable = ref->u.c.component->allocatable;
1920 allocatable = pointer = 0;
1924 attr.dimension = dimension;
1925 attr.pointer = pointer;
1926 attr.allocatable = allocatable;
1927 attr.target = target;
1933 /* Return the attribute from a general expression. */
1936 gfc_expr_attr (gfc_expr *e)
1938 symbol_attribute attr;
1940 switch (e->expr_type)
1943 attr = gfc_variable_attr (e, NULL);
1947 gfc_clear_attr (&attr);
1949 if (e->value.function.esym != NULL)
1950 attr = e->value.function.esym->result->attr;
1952 /* TODO: NULL() returns pointers. May have to take care of this
1958 gfc_clear_attr (&attr);
1966 /* Match a structure constructor. The initial symbol has already been
1969 typedef struct gfc_structure_ctor_component
1974 struct gfc_structure_ctor_component* next;
1976 gfc_structure_ctor_component;
1978 #define gfc_get_structure_ctor_component() XCNEW (gfc_structure_ctor_component)
1981 gfc_free_structure_ctor_component (gfc_structure_ctor_component *comp)
1983 gfc_free (comp->name);
1984 gfc_free_expr (comp->val);
1988 gfc_match_structure_constructor (gfc_symbol *sym, gfc_expr **result)
1990 gfc_structure_ctor_component *comp_head, *comp_tail;
1991 gfc_structure_ctor_component *comp_iter;
1992 gfc_constructor *ctor_head, *ctor_tail;
1993 gfc_component *comp; /* Is set NULL when named component is first seen */
1997 const char* last_name = NULL;
1999 comp_head = comp_tail = NULL;
2000 ctor_head = ctor_tail = NULL;
2002 if (gfc_match_char ('(') != MATCH_YES)
2005 where = gfc_current_locus;
2007 gfc_find_component (sym, NULL);
2009 /* Match the component list and store it in a list together with the
2010 corresponding component names. Check for empty argument list first. */
2011 if (gfc_match_char (')') != MATCH_YES)
2013 comp = sym->components;
2016 gfc_component *this_comp = NULL;
2019 comp_tail = comp_head = gfc_get_structure_ctor_component ();
2022 comp_tail->next = gfc_get_structure_ctor_component ();
2023 comp_tail = comp_tail->next;
2025 comp_tail->name = XCNEWVEC (char, GFC_MAX_SYMBOL_LEN + 1);
2026 comp_tail->val = NULL;
2027 comp_tail->where = gfc_current_locus;
2029 /* Try matching a component name. */
2030 if (gfc_match_name (comp_tail->name) == MATCH_YES
2031 && gfc_match_char ('=') == MATCH_YES)
2033 if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: Structure"
2034 " constructor with named arguments at %C")
2038 last_name = comp_tail->name;
2043 /* Components without name are not allowed after the first named
2044 component initializer! */
2048 gfc_error ("Component initializer without name after"
2049 " component named %s at %C!", last_name);
2051 gfc_error ("Too many components in structure constructor at"
2056 gfc_current_locus = comp_tail->where;
2057 strncpy (comp_tail->name, comp->name, GFC_MAX_SYMBOL_LEN + 1);
2060 /* Find the current component in the structure definition; this is
2061 needed to get its access attribute in the private check below. */
2066 for (comp = sym->components; comp; comp = comp->next)
2067 if (!strcmp (comp->name, comp_tail->name))
2072 comp = NULL; /* Reset needed! */
2074 /* Here we can check if a component name is given which does not
2075 correspond to any component of the defined structure. */
2078 gfc_error ("Component '%s' in structure constructor at %C"
2079 " does not correspond to any component in the"
2080 " constructed structure!", comp_tail->name);
2084 gcc_assert (this_comp);
2086 /* Check the current component's access status. */
2087 if (sym->attr.use_assoc && this_comp->access == ACCESS_PRIVATE)
2089 gfc_error ("Component '%s' is PRIVATE in structure constructor"
2090 " at %C!", comp_tail->name);
2094 /* Check if this component is already given a value. */
2095 for (comp_iter = comp_head; comp_iter != comp_tail;
2096 comp_iter = comp_iter->next)
2098 gcc_assert (comp_iter);
2099 if (!strcmp (comp_iter->name, comp_tail->name))
2101 gfc_error ("Component '%s' is initialized twice in the"
2102 " structure constructor at %C!", comp_tail->name);
2107 /* Match the current initializer expression. */
2108 m = gfc_match_expr (&comp_tail->val);
2111 if (m == MATCH_ERROR)
2117 while (gfc_match_char (',') == MATCH_YES);
2119 if (gfc_match_char (')') != MATCH_YES)
2122 /* If there were components given and all components are private, error
2123 out at this place. */
2124 if (sym->attr.use_assoc && sym->component_access == ACCESS_PRIVATE)
2126 gfc_error ("All components of '%s' are PRIVATE in structure"
2127 " constructor at %C", sym->name);
2132 /* Translate the component list into the actual constructor by sorting it in
2133 the order required; this also checks along the way that each and every
2134 component actually has an initializer and handles default initializers
2135 for components without explicit value given. */
2136 for (comp = sym->components; comp; comp = comp->next)
2138 gfc_structure_ctor_component **next_ptr;
2139 gfc_expr *value = NULL;
2141 /* Try to find the initializer for the current component by name. */
2142 next_ptr = &comp_head;
2143 for (comp_iter = comp_head; comp_iter; comp_iter = comp_iter->next)
2145 if (!strcmp (comp_iter->name, comp->name))
2147 next_ptr = &comp_iter->next;
2150 /* If it was not found, try the default initializer if there's any;
2151 otherwise, it's an error. */
2154 if (comp->initializer)
2156 if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: Structure"
2157 " constructor with missing optional arguments"
2158 " at %C") == FAILURE)
2160 value = gfc_copy_expr (comp->initializer);
2164 gfc_error ("No initializer for component '%s' given in the"
2165 " structure constructor at %C!", comp->name);
2170 value = comp_iter->val;
2172 /* Add the value to the constructor chain built. */
2175 ctor_tail->next = gfc_get_constructor ();
2176 ctor_tail = ctor_tail->next;
2179 ctor_head = ctor_tail = gfc_get_constructor ();
2181 ctor_tail->expr = value;
2183 /* Remove the entry from the component list. We don't want the expression
2184 value to be free'd, so set it to NULL. */
2187 *next_ptr = comp_iter->next;
2188 comp_iter->val = NULL;
2189 gfc_free_structure_ctor_component (comp_iter);
2193 /* No component should be left, as this should have caused an error in the
2194 loop constructing the component-list (name that does not correspond to any
2195 component in the structure definition). */
2196 gcc_assert (!comp_head);
2198 e = gfc_get_expr ();
2200 e->expr_type = EXPR_STRUCTURE;
2202 e->ts.type = BT_DERIVED;
2203 e->ts.derived = sym;
2206 e->value.constructor = ctor_head;
2212 gfc_error ("Syntax error in structure constructor at %C");
2215 for (comp_iter = comp_head; comp_iter; )
2217 gfc_structure_ctor_component *next = comp_iter->next;
2218 gfc_free_structure_ctor_component (comp_iter);
2221 gfc_free_constructor (ctor_head);
2226 /* If the symbol is an implicit do loop index and implicitly typed,
2227 it should not be host associated. Provide a symtree from the
2228 current namespace. */
2230 check_for_implicit_index (gfc_symtree **st, gfc_symbol **sym)
2232 if ((*sym)->attr.flavor == FL_VARIABLE
2233 && (*sym)->ns != gfc_current_ns
2234 && (*sym)->attr.implied_index
2235 && (*sym)->attr.implicit_type
2236 && !(*sym)->attr.use_assoc)
2239 i = gfc_get_sym_tree ((*sym)->name, NULL, st);
2242 *sym = (*st)->n.sym;
2248 /* Matches a variable name followed by anything that might follow it--
2249 array reference, argument list of a function, etc. */
2252 gfc_match_rvalue (gfc_expr **result)
2254 gfc_actual_arglist *actual_arglist;
2255 char name[GFC_MAX_SYMBOL_LEN + 1], argname[GFC_MAX_SYMBOL_LEN + 1];
2258 gfc_symtree *symtree;
2259 locus where, old_loc;
2267 m = gfc_match_name (name);
2271 if (gfc_find_state (COMP_INTERFACE) == SUCCESS
2272 && !gfc_current_ns->has_import_set)
2273 i = gfc_get_sym_tree (name, NULL, &symtree);
2275 i = gfc_get_ha_sym_tree (name, &symtree);
2280 sym = symtree->n.sym;
2282 where = gfc_current_locus;
2284 /* If this is an implicit do loop index and implicitly typed,
2285 it should not be host associated. */
2286 m = check_for_implicit_index (&symtree, &sym);
2290 gfc_set_sym_referenced (sym);
2291 sym->attr.implied_index = 0;
2293 if (sym->attr.function && sym->result == sym)
2295 /* See if this is a directly recursive function call. */
2296 gfc_gobble_whitespace ();
2297 if (sym->attr.recursive
2298 && gfc_peek_ascii_char () == '('
2299 && gfc_current_ns->proc_name == sym
2300 && !sym->attr.dimension)
2302 gfc_error ("'%s' at %C is the name of a recursive function "
2303 "and so refers to the result variable. Use an "
2304 "explicit RESULT variable for direct recursion "
2305 "(12.5.2.1)", sym->name);
2309 if (gfc_current_ns->proc_name == sym
2310 || (gfc_current_ns->parent != NULL
2311 && gfc_current_ns->parent->proc_name == sym))
2315 && (sym->ns == gfc_current_ns
2316 || sym->ns == gfc_current_ns->parent))
2318 gfc_entry_list *el = NULL;
2320 for (el = sym->ns->entries; el; el = el->next)
2326 if (sym->attr.function || sym->attr.external || sym->attr.intrinsic)
2329 if (sym->attr.generic)
2330 goto generic_function;
2332 switch (sym->attr.flavor)
2336 if (sym->ts.type == BT_UNKNOWN && gfc_peek_ascii_char () == '%'
2337 && gfc_get_default_type (sym, sym->ns)->type == BT_DERIVED)
2338 gfc_set_default_type (sym, 0, sym->ns);
2340 e = gfc_get_expr ();
2342 e->expr_type = EXPR_VARIABLE;
2343 e->symtree = symtree;
2345 m = match_varspec (e, 0);
2349 /* A statement of the form "REAL, parameter :: a(0:10) = 1" will
2350 end up here. Unfortunately, sym->value->expr_type is set to
2351 EXPR_CONSTANT, and so the if () branch would be followed without
2352 the !sym->as check. */
2353 if (sym->value && sym->value->expr_type != EXPR_ARRAY && !sym->as)
2354 e = gfc_copy_expr (sym->value);
2357 e = gfc_get_expr ();
2358 e->expr_type = EXPR_VARIABLE;
2361 e->symtree = symtree;
2362 m = match_varspec (e, 0);
2364 if (sym->ts.is_c_interop || sym->ts.is_iso_c)
2367 /* Variable array references to derived type parameters cause
2368 all sorts of headaches in simplification. Treating such
2369 expressions as variable works just fine for all array
2371 if (sym->value && sym->ts.type == BT_DERIVED && e->ref)
2373 for (ref = e->ref; ref; ref = ref->next)
2374 if (ref->type == REF_ARRAY)
2377 if (ref == NULL || ref->u.ar.type == AR_FULL)
2383 e = gfc_get_expr ();
2384 e->expr_type = EXPR_VARIABLE;
2385 e->symtree = symtree;
2392 sym = gfc_use_derived (sym);
2396 m = gfc_match_structure_constructor (sym, &e);
2399 /* If we're here, then the name is known to be the name of a
2400 procedure, yet it is not sure to be the name of a function. */
2402 if (sym->attr.subroutine)
2404 gfc_error ("Unexpected use of subroutine name '%s' at %C",
2410 /* At this point, the name has to be a non-statement function.
2411 If the name is the same as the current function being
2412 compiled, then we have a variable reference (to the function
2413 result) if the name is non-recursive. */
2415 st = gfc_enclosing_unit (NULL);
2417 if (st != NULL && st->state == COMP_FUNCTION
2419 && !sym->attr.recursive)
2421 e = gfc_get_expr ();
2422 e->symtree = symtree;
2423 e->expr_type = EXPR_VARIABLE;
2425 m = match_varspec (e, 0);
2429 /* Match a function reference. */
2431 m = gfc_match_actual_arglist (0, &actual_arglist);
2434 if (sym->attr.proc == PROC_ST_FUNCTION)
2435 gfc_error ("Statement function '%s' requires argument list at %C",
2438 gfc_error ("Function '%s' requires an argument list at %C",
2451 gfc_get_ha_sym_tree (name, &symtree); /* Can't fail */
2452 sym = symtree->n.sym;
2454 e = gfc_get_expr ();
2455 e->symtree = symtree;
2456 e->expr_type = EXPR_FUNCTION;
2457 e->value.function.actual = actual_arglist;
2458 e->where = gfc_current_locus;
2460 if (sym->as != NULL)
2461 e->rank = sym->as->rank;
2463 if (!sym->attr.function
2464 && gfc_add_function (&sym->attr, sym->name, NULL) == FAILURE)
2470 /* Check here for the existence of at least one argument for the
2471 iso_c_binding functions C_LOC, C_FUNLOC, and C_ASSOCIATED. The
2472 argument(s) given will be checked in gfc_iso_c_func_interface,
2473 during resolution of the function call. */
2474 if (sym->attr.is_iso_c == 1
2475 && (sym->from_intmod == INTMOD_ISO_C_BINDING
2476 && (sym->intmod_sym_id == ISOCBINDING_LOC
2477 || sym->intmod_sym_id == ISOCBINDING_FUNLOC
2478 || sym->intmod_sym_id == ISOCBINDING_ASSOCIATED)))
2480 /* make sure we were given a param */
2481 if (actual_arglist == NULL)
2483 gfc_error ("Missing argument to '%s' at %C", sym->name);
2489 if (sym->result == NULL)
2497 /* Special case for derived type variables that get their types
2498 via an IMPLICIT statement. This can't wait for the
2499 resolution phase. */
2501 if (gfc_peek_ascii_char () == '%'
2502 && sym->ts.type == BT_UNKNOWN
2503 && gfc_get_default_type (sym, sym->ns)->type == BT_DERIVED)
2504 gfc_set_default_type (sym, 0, sym->ns);
2506 /* If the symbol has a dimension attribute, the expression is a
2509 if (sym->attr.dimension)
2511 if (gfc_add_flavor (&sym->attr, FL_VARIABLE,
2512 sym->name, NULL) == FAILURE)
2518 e = gfc_get_expr ();
2519 e->symtree = symtree;
2520 e->expr_type = EXPR_VARIABLE;
2521 m = match_varspec (e, 0);
2525 /* Name is not an array, so we peek to see if a '(' implies a
2526 function call or a substring reference. Otherwise the
2527 variable is just a scalar. */
2529 gfc_gobble_whitespace ();
2530 if (gfc_peek_ascii_char () != '(')
2532 /* Assume a scalar variable */
2533 e = gfc_get_expr ();
2534 e->symtree = symtree;
2535 e->expr_type = EXPR_VARIABLE;
2537 if (gfc_add_flavor (&sym->attr, FL_VARIABLE,
2538 sym->name, NULL) == FAILURE)
2544 /*FIXME:??? match_varspec does set this for us: */
2546 m = match_varspec (e, 0);
2550 /* See if this is a function reference with a keyword argument
2551 as first argument. We do this because otherwise a spurious
2552 symbol would end up in the symbol table. */
2554 old_loc = gfc_current_locus;
2555 m2 = gfc_match (" ( %n =", argname);
2556 gfc_current_locus = old_loc;
2558 e = gfc_get_expr ();
2559 e->symtree = symtree;
2561 if (m2 != MATCH_YES)
2563 /* Try to figure out whether we're dealing with a character type.
2564 We're peeking ahead here, because we don't want to call
2565 match_substring if we're dealing with an implicitly typed
2566 non-character variable. */
2567 implicit_char = false;
2568 if (sym->ts.type == BT_UNKNOWN)
2570 ts = gfc_get_default_type (sym,NULL);
2571 if (ts->type == BT_CHARACTER)
2572 implicit_char = true;
2575 /* See if this could possibly be a substring reference of a name
2576 that we're not sure is a variable yet. */
2578 if ((implicit_char || sym->ts.type == BT_CHARACTER)
2579 && match_substring (sym->ts.cl, 0, &e->ref) == MATCH_YES)
2582 e->expr_type = EXPR_VARIABLE;
2584 if (sym->attr.flavor != FL_VARIABLE
2585 && gfc_add_flavor (&sym->attr, FL_VARIABLE,
2586 sym->name, NULL) == FAILURE)
2592 if (sym->ts.type == BT_UNKNOWN
2593 && gfc_set_default_type (sym, 1, NULL) == FAILURE)
2607 /* Give up, assume we have a function. */
2609 gfc_get_sym_tree (name, NULL, &symtree); /* Can't fail */
2610 sym = symtree->n.sym;
2611 e->expr_type = EXPR_FUNCTION;
2613 if (!sym->attr.function
2614 && gfc_add_function (&sym->attr, sym->name, NULL) == FAILURE)
2622 m = gfc_match_actual_arglist (0, &e->value.function.actual);
2624 gfc_error ("Missing argument list in function '%s' at %C", sym->name);
2632 /* If our new function returns a character, array or structure
2633 type, it might have subsequent references. */
2635 m = match_varspec (e, 0);
2642 gfc_get_sym_tree (name, NULL, &symtree); /* Can't fail */
2644 e = gfc_get_expr ();
2645 e->symtree = symtree;
2646 e->expr_type = EXPR_FUNCTION;
2648 m = gfc_match_actual_arglist (0, &e->value.function.actual);
2652 gfc_error ("Symbol at %C is not appropriate for an expression");
2668 /* Match a variable, ie something that can be assigned to. This
2669 starts as a symbol, can be a structure component or an array
2670 reference. It can be a function if the function doesn't have a
2671 separate RESULT variable. If the symbol has not been previously
2672 seen, we assume it is a variable.
2674 This function is called by two interface functions:
2675 gfc_match_variable, which has host_flag = 1, and
2676 gfc_match_equiv_variable, with host_flag = 0, to restrict the
2677 match of the symbol to the local scope. */
2680 match_variable (gfc_expr **result, int equiv_flag, int host_flag)
2688 /* Since nothing has any business being an lvalue in a module
2689 specification block, an interface block or a contains section,
2690 we force the changed_symbols mechanism to work by setting
2691 host_flag to 0. This prevents valid symbols that have the name
2692 of keywords, such as 'end', being turned into variables by
2693 failed matching to assignments for, eg., END INTERFACE. */
2694 if (gfc_current_state () == COMP_MODULE
2695 || gfc_current_state () == COMP_INTERFACE
2696 || gfc_current_state () == COMP_CONTAINS)
2699 m = gfc_match_sym_tree (&st, host_flag);
2702 where = gfc_current_locus;
2706 /* If this is an implicit do loop index and implicitly typed,
2707 it should not be host associated. */
2708 m = check_for_implicit_index (&st, &sym);
2712 sym->attr.implied_index = 0;
2714 gfc_set_sym_referenced (sym);
2715 switch (sym->attr.flavor)
2718 if (sym->attr.protected && sym->attr.use_assoc)
2720 gfc_error ("Assigning to PROTECTED variable at %C");
2727 sym_flavor flavor = FL_UNKNOWN;
2729 gfc_gobble_whitespace ();
2731 if (sym->attr.external || sym->attr.procedure
2732 || sym->attr.function || sym->attr.subroutine)
2733 flavor = FL_PROCEDURE;
2735 /* If it is not a procedure, is not typed and is host associated,
2736 we cannot give it a flavor yet. */
2737 else if (sym->ns == gfc_current_ns->parent
2738 && sym->ts.type == BT_UNKNOWN)
2741 /* These are definitive indicators that this is a variable. */
2742 else if (gfc_peek_ascii_char () != '(' || sym->ts.type != BT_UNKNOWN
2743 || sym->attr.pointer || sym->as != NULL)
2744 flavor = FL_VARIABLE;
2746 if (flavor != FL_UNKNOWN
2747 && gfc_add_flavor (&sym->attr, flavor, sym->name, NULL) == FAILURE)
2754 gfc_error ("Named constant at %C in an EQUIVALENCE");
2756 gfc_error ("Cannot assign to a named constant at %C");
2761 /* Check for a nonrecursive function result variable. */
2762 if (sym->attr.function
2763 && !sym->attr.external
2764 && sym->result == sym
2765 && ((sym == gfc_current_ns->proc_name
2766 && sym == gfc_current_ns->proc_name->result)
2767 || (gfc_current_ns->parent
2768 && sym == gfc_current_ns->parent->proc_name->result)
2770 && sym->ns == gfc_current_ns)
2772 && sym->ns == gfc_current_ns->parent)))
2774 /* If a function result is a derived type, then the derived
2775 type may still have to be resolved. */
2777 if (sym->ts.type == BT_DERIVED
2778 && gfc_use_derived (sym->ts.derived) == NULL)
2783 /* Fall through to error */
2786 gfc_error ("'%s' at %C is not a variable", sym->name);
2790 /* Special case for derived type variables that get their types
2791 via an IMPLICIT statement. This can't wait for the
2792 resolution phase. */
2795 gfc_namespace * implicit_ns;
2797 if (gfc_current_ns->proc_name == sym)
2798 implicit_ns = gfc_current_ns;
2800 implicit_ns = sym->ns;
2802 if (gfc_peek_ascii_char () == '%'
2803 && sym->ts.type == BT_UNKNOWN
2804 && gfc_get_default_type (sym, implicit_ns)->type == BT_DERIVED)
2805 gfc_set_default_type (sym, 0, implicit_ns);
2808 expr = gfc_get_expr ();
2810 expr->expr_type = EXPR_VARIABLE;
2813 expr->where = where;
2815 /* Now see if we have to do more. */
2816 m = match_varspec (expr, equiv_flag);
2819 gfc_free_expr (expr);
2829 gfc_match_variable (gfc_expr **result, int equiv_flag)
2831 return match_variable (result, equiv_flag, 1);
2836 gfc_match_equiv_variable (gfc_expr **result)
2838 return match_variable (result, 1, 0);