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 gfc_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
1702 statement. sub_flag tells whether we expect a type-bound procedure found
1703 to be a subroutine as part of CALL or a FUNCTION. */
1706 gfc_match_varspec (gfc_expr *primary, int equiv_flag, bool sub_flag)
1708 char name[GFC_MAX_SYMBOL_LEN + 1];
1709 gfc_ref *substring, *tail;
1710 gfc_component *component;
1711 gfc_symbol *sym = primary->symtree->n.sym;
1717 gfc_gobble_whitespace ();
1718 if ((equiv_flag && gfc_peek_ascii_char () == '(') || sym->attr.dimension)
1720 /* In EQUIVALENCE, we don't know yet whether we are seeing
1721 an array, character variable or array of character
1722 variables. We'll leave the decision till resolve time. */
1723 tail = extend_ref (primary, tail);
1724 tail->type = REF_ARRAY;
1726 m = gfc_match_array_ref (&tail->u.ar, equiv_flag ? NULL : sym->as,
1731 gfc_gobble_whitespace ();
1732 if (equiv_flag && gfc_peek_ascii_char () == '(')
1734 tail = extend_ref (primary, tail);
1735 tail->type = REF_ARRAY;
1737 m = gfc_match_array_ref (&tail->u.ar, NULL, equiv_flag);
1743 primary->ts = sym->ts;
1748 if (sym->ts.type != BT_DERIVED || gfc_match_char ('%') != MATCH_YES)
1749 goto check_substring;
1751 sym = sym->ts.derived;
1758 m = gfc_match_name (name);
1760 gfc_error ("Expected structure component name at %C");
1764 tbp = gfc_find_typebound_proc (sym, &t, name, false);
1767 gfc_symbol* tbp_sym;
1772 gcc_assert (!tail || !tail->next);
1773 gcc_assert (primary->expr_type == EXPR_VARIABLE);
1775 if (tbp->typebound->is_generic)
1778 tbp_sym = tbp->typebound->u.specific->n.sym;
1780 primary->expr_type = EXPR_COMPCALL;
1781 primary->value.compcall.tbp = tbp->typebound;
1782 primary->value.compcall.derived = sym;
1783 primary->value.compcall.name = tbp->name;
1784 gcc_assert (primary->symtree->n.sym->attr.referenced);
1786 primary->ts = tbp_sym->ts;
1788 m = gfc_match_actual_arglist (tbp->typebound->subroutine,
1789 &primary->value.compcall.actual);
1790 if (m == MATCH_ERROR)
1795 primary->value.compcall.actual = NULL;
1798 gfc_error ("Expected argument list at %C");
1803 gfc_set_sym_referenced (tbp->n.sym);
1808 component = gfc_find_component (sym, name, false, false);
1809 if (component == NULL)
1812 tail = extend_ref (primary, tail);
1813 tail->type = REF_COMPONENT;
1815 tail->u.c.component = component;
1816 tail->u.c.sym = sym;
1818 primary->ts = component->ts;
1820 if (component->as != NULL)
1822 tail = extend_ref (primary, tail);
1823 tail->type = REF_ARRAY;
1825 m = gfc_match_array_ref (&tail->u.ar, component->as, equiv_flag);
1830 if (component->ts.type != BT_DERIVED
1831 || gfc_match_char ('%') != MATCH_YES)
1834 sym = component->ts.derived;
1839 if (primary->ts.type == BT_UNKNOWN)
1841 if (gfc_get_default_type (sym, sym->ns)->type == BT_CHARACTER)
1843 gfc_set_default_type (sym, 0, sym->ns);
1844 primary->ts = sym->ts;
1849 if (primary->ts.type == BT_CHARACTER)
1851 switch (match_substring (primary->ts.cl, equiv_flag, &substring))
1855 primary->ref = substring;
1857 tail->next = substring;
1859 if (primary->expr_type == EXPR_CONSTANT)
1860 primary->expr_type = EXPR_SUBSTRING;
1863 primary->ts.cl = NULL;
1869 gfc_clear_ts (&primary->ts);
1881 /* Given an expression that is a variable, figure out what the
1882 ultimate variable's type and attribute is, traversing the reference
1883 structures if necessary.
1885 This subroutine is trickier than it looks. We start at the base
1886 symbol and store the attribute. Component references load a
1887 completely new attribute.
1889 A couple of rules come into play. Subobjects of targets are always
1890 targets themselves. If we see a component that goes through a
1891 pointer, then the expression must also be a target, since the
1892 pointer is associated with something (if it isn't core will soon be
1893 dumped). If we see a full part or section of an array, the
1894 expression is also an array.
1896 We can have at most one full array reference. */
1899 gfc_variable_attr (gfc_expr *expr, gfc_typespec *ts)
1901 int dimension, pointer, allocatable, target;
1902 symbol_attribute attr;
1905 if (expr->expr_type != EXPR_VARIABLE)
1906 gfc_internal_error ("gfc_variable_attr(): Expression isn't a variable");
1909 attr = expr->symtree->n.sym->attr;
1911 dimension = attr.dimension;
1912 pointer = attr.pointer;
1913 allocatable = attr.allocatable;
1915 target = attr.target;
1919 if (ts != NULL && expr->ts.type == BT_UNKNOWN)
1920 *ts = expr->symtree->n.sym->ts;
1922 for (; ref; ref = ref->next)
1927 switch (ref->u.ar.type)
1934 allocatable = pointer = 0;
1939 allocatable = pointer = 0;
1943 gfc_internal_error ("gfc_variable_attr(): Bad array reference");
1949 attr = ref->u.c.component->attr;
1952 *ts = ref->u.c.component->ts;
1953 /* Don't set the string length if a substring reference
1955 if (ts->type == BT_CHARACTER
1956 && ref->next && ref->next->type == REF_SUBSTRING)
1960 pointer = ref->u.c.component->attr.pointer;
1961 allocatable = ref->u.c.component->attr.allocatable;
1968 allocatable = pointer = 0;
1972 attr.dimension = dimension;
1973 attr.pointer = pointer;
1974 attr.allocatable = allocatable;
1975 attr.target = target;
1981 /* Return the attribute from a general expression. */
1984 gfc_expr_attr (gfc_expr *e)
1986 symbol_attribute attr;
1988 switch (e->expr_type)
1991 attr = gfc_variable_attr (e, NULL);
1995 gfc_clear_attr (&attr);
1997 if (e->value.function.esym != NULL)
1998 attr = e->value.function.esym->result->attr;
2000 /* TODO: NULL() returns pointers. May have to take care of this
2006 gfc_clear_attr (&attr);
2014 /* Match a structure constructor. The initial symbol has already been
2017 typedef struct gfc_structure_ctor_component
2022 struct gfc_structure_ctor_component* next;
2024 gfc_structure_ctor_component;
2026 #define gfc_get_structure_ctor_component() XCNEW (gfc_structure_ctor_component)
2029 gfc_free_structure_ctor_component (gfc_structure_ctor_component *comp)
2031 gfc_free (comp->name);
2032 gfc_free_expr (comp->val);
2036 /* Translate the component list into the actual constructor by sorting it in
2037 the order required; this also checks along the way that each and every
2038 component actually has an initializer and handles default initializers
2039 for components without explicit value given. */
2041 build_actual_constructor (gfc_structure_ctor_component **comp_head,
2042 gfc_constructor **ctor_head, gfc_symbol *sym)
2044 gfc_structure_ctor_component *comp_iter;
2045 gfc_constructor *ctor_tail = NULL;
2046 gfc_component *comp;
2048 for (comp = sym->components; comp; comp = comp->next)
2050 gfc_structure_ctor_component **next_ptr;
2051 gfc_expr *value = NULL;
2053 /* Try to find the initializer for the current component by name. */
2054 next_ptr = comp_head;
2055 for (comp_iter = *comp_head; comp_iter; comp_iter = comp_iter->next)
2057 if (!strcmp (comp_iter->name, comp->name))
2059 next_ptr = &comp_iter->next;
2062 /* If an extension, try building the parent derived type by building
2063 a value expression for the parent derived type and calling self. */
2064 if (!comp_iter && comp == sym->components && sym->attr.extension)
2066 value = gfc_get_expr ();
2067 value->expr_type = EXPR_STRUCTURE;
2068 value->value.constructor = NULL;
2069 value->ts = comp->ts;
2070 value->where = gfc_current_locus;
2072 if (build_actual_constructor (comp_head, &value->value.constructor,
2073 comp->ts.derived) == FAILURE)
2075 gfc_free_expr (value);
2078 *ctor_head = ctor_tail = gfc_get_constructor ();
2079 ctor_tail->expr = value;
2083 /* If it was not found, try the default initializer if there's any;
2084 otherwise, it's an error. */
2087 if (comp->initializer)
2089 if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: Structure"
2090 " constructor with missing optional arguments"
2091 " at %C") == FAILURE)
2093 value = gfc_copy_expr (comp->initializer);
2097 gfc_error ("No initializer for component '%s' given in the"
2098 " structure constructor at %C!", comp->name);
2103 value = comp_iter->val;
2105 /* Add the value to the constructor chain built. */
2108 ctor_tail->next = gfc_get_constructor ();
2109 ctor_tail = ctor_tail->next;
2112 *ctor_head = ctor_tail = gfc_get_constructor ();
2114 ctor_tail->expr = value;
2116 /* Remove the entry from the component list. We don't want the expression
2117 value to be free'd, so set it to NULL. */
2120 *next_ptr = comp_iter->next;
2121 comp_iter->val = NULL;
2122 gfc_free_structure_ctor_component (comp_iter);
2129 gfc_match_structure_constructor (gfc_symbol *sym, gfc_expr **result, bool parent)
2131 gfc_structure_ctor_component *comp_tail, *comp_head, *comp_iter;
2132 gfc_constructor *ctor_head, *ctor_tail;
2133 gfc_component *comp; /* Is set NULL when named component is first seen */
2137 const char* last_name = NULL;
2139 comp_tail = comp_head = NULL;
2140 ctor_head = ctor_tail = NULL;
2142 if (!parent && gfc_match_char ('(') != MATCH_YES)
2145 where = gfc_current_locus;
2147 gfc_find_component (sym, NULL, false, true);
2149 /* Match the component list and store it in a list together with the
2150 corresponding component names. Check for empty argument list first. */
2151 if (gfc_match_char (')') != MATCH_YES)
2153 comp = sym->components;
2156 gfc_component *this_comp = NULL;
2159 comp_tail = comp_head = gfc_get_structure_ctor_component ();
2162 comp_tail->next = gfc_get_structure_ctor_component ();
2163 comp_tail = comp_tail->next;
2165 comp_tail->name = XCNEWVEC (char, GFC_MAX_SYMBOL_LEN + 1);
2166 comp_tail->val = NULL;
2167 comp_tail->where = gfc_current_locus;
2169 /* Try matching a component name. */
2170 if (gfc_match_name (comp_tail->name) == MATCH_YES
2171 && gfc_match_char ('=') == MATCH_YES)
2173 if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: Structure"
2174 " constructor with named arguments at %C")
2178 last_name = comp_tail->name;
2183 /* Components without name are not allowed after the first named
2184 component initializer! */
2188 gfc_error ("Component initializer without name after"
2189 " component named %s at %C!", last_name);
2191 gfc_error ("Too many components in structure constructor at"
2196 gfc_current_locus = comp_tail->where;
2197 strncpy (comp_tail->name, comp->name, GFC_MAX_SYMBOL_LEN + 1);
2200 /* Find the current component in the structure definition and check
2201 its access is not private. */
2203 this_comp = gfc_find_component (sym, comp->name, false, false);
2206 this_comp = gfc_find_component (sym,
2207 (const char *)comp_tail->name,
2209 comp = NULL; /* Reset needed! */
2212 /* Here we can check if a component name is given which does not
2213 correspond to any component of the defined structure. */
2217 /* Check if this component is already given a value. */
2218 for (comp_iter = comp_head; comp_iter != comp_tail;
2219 comp_iter = comp_iter->next)
2221 gcc_assert (comp_iter);
2222 if (!strcmp (comp_iter->name, comp_tail->name))
2224 gfc_error ("Component '%s' is initialized twice in the"
2225 " structure constructor at %C!", comp_tail->name);
2230 /* Match the current initializer expression. */
2231 m = gfc_match_expr (&comp_tail->val);
2234 if (m == MATCH_ERROR)
2237 /* If not explicitly a parent constructor, gather up the components
2239 if (comp && comp == sym->components
2240 && sym->attr.extension
2241 && (comp_tail->val->ts.type != BT_DERIVED
2243 comp_tail->val->ts.derived != this_comp->ts.derived))
2245 gfc_current_locus = where;
2246 gfc_free_expr (comp_tail->val);
2248 m = gfc_match_structure_constructor (comp->ts.derived,
2249 &comp_tail->val, true);
2252 if (m == MATCH_ERROR)
2259 if (parent && !comp)
2263 while (gfc_match_char (',') == MATCH_YES);
2265 if (!parent && gfc_match_char (')') != MATCH_YES)
2269 if (build_actual_constructor (&comp_head, &ctor_head, sym) == FAILURE)
2272 /* No component should be left, as this should have caused an error in the
2273 loop constructing the component-list (name that does not correspond to any
2274 component in the structure definition). */
2275 if (comp_head && sym->attr.extension)
2277 for (comp_iter = comp_head; comp_iter; comp_iter = comp_iter->next)
2279 gfc_error ("component '%s' at %L has already been set by a "
2280 "parent derived type constructor", comp_iter->name,
2286 gcc_assert (!comp_head);
2288 e = gfc_get_expr ();
2290 e->expr_type = EXPR_STRUCTURE;
2292 e->ts.type = BT_DERIVED;
2293 e->ts.derived = sym;
2296 e->value.constructor = ctor_head;
2302 gfc_error ("Syntax error in structure constructor at %C");
2305 for (comp_iter = comp_head; comp_iter; )
2307 gfc_structure_ctor_component *next = comp_iter->next;
2308 gfc_free_structure_ctor_component (comp_iter);
2311 gfc_free_constructor (ctor_head);
2316 /* If the symbol is an implicit do loop index and implicitly typed,
2317 it should not be host associated. Provide a symtree from the
2318 current namespace. */
2320 check_for_implicit_index (gfc_symtree **st, gfc_symbol **sym)
2322 if ((*sym)->attr.flavor == FL_VARIABLE
2323 && (*sym)->ns != gfc_current_ns
2324 && (*sym)->attr.implied_index
2325 && (*sym)->attr.implicit_type
2326 && !(*sym)->attr.use_assoc)
2329 i = gfc_get_sym_tree ((*sym)->name, NULL, st);
2332 *sym = (*st)->n.sym;
2338 /* Matches a variable name followed by anything that might follow it--
2339 array reference, argument list of a function, etc. */
2342 gfc_match_rvalue (gfc_expr **result)
2344 gfc_actual_arglist *actual_arglist;
2345 char name[GFC_MAX_SYMBOL_LEN + 1], argname[GFC_MAX_SYMBOL_LEN + 1];
2348 gfc_symtree *symtree;
2349 locus where, old_loc;
2357 m = gfc_match_name (name);
2361 if (gfc_find_state (COMP_INTERFACE) == SUCCESS
2362 && !gfc_current_ns->has_import_set)
2363 i = gfc_get_sym_tree (name, NULL, &symtree);
2365 i = gfc_get_ha_sym_tree (name, &symtree);
2370 sym = symtree->n.sym;
2372 where = gfc_current_locus;
2374 /* If this is an implicit do loop index and implicitly typed,
2375 it should not be host associated. */
2376 m = check_for_implicit_index (&symtree, &sym);
2380 gfc_set_sym_referenced (sym);
2381 sym->attr.implied_index = 0;
2383 if (sym->attr.function && sym->result == sym)
2385 /* See if this is a directly recursive function call. */
2386 gfc_gobble_whitespace ();
2387 if (sym->attr.recursive
2388 && gfc_peek_ascii_char () == '('
2389 && gfc_current_ns->proc_name == sym
2390 && !sym->attr.dimension)
2392 gfc_error ("'%s' at %C is the name of a recursive function "
2393 "and so refers to the result variable. Use an "
2394 "explicit RESULT variable for direct recursion "
2395 "(12.5.2.1)", sym->name);
2399 if (gfc_current_ns->proc_name == sym
2400 || (gfc_current_ns->parent != NULL
2401 && gfc_current_ns->parent->proc_name == sym))
2405 && (sym->ns == gfc_current_ns
2406 || sym->ns == gfc_current_ns->parent))
2408 gfc_entry_list *el = NULL;
2410 for (el = sym->ns->entries; el; el = el->next)
2416 if (gfc_matching_procptr_assignment)
2419 if (sym->attr.function || sym->attr.external || sym->attr.intrinsic)
2422 if (sym->attr.generic)
2423 goto generic_function;
2425 switch (sym->attr.flavor)
2429 if (sym->ts.type == BT_UNKNOWN && gfc_peek_ascii_char () == '%'
2430 && gfc_get_default_type (sym, sym->ns)->type == BT_DERIVED)
2431 gfc_set_default_type (sym, 0, sym->ns);
2433 e = gfc_get_expr ();
2435 e->expr_type = EXPR_VARIABLE;
2436 e->symtree = symtree;
2438 m = gfc_match_varspec (e, 0, false);
2442 /* A statement of the form "REAL, parameter :: a(0:10) = 1" will
2443 end up here. Unfortunately, sym->value->expr_type is set to
2444 EXPR_CONSTANT, and so the if () branch would be followed without
2445 the !sym->as check. */
2446 if (sym->value && sym->value->expr_type != EXPR_ARRAY && !sym->as)
2447 e = gfc_copy_expr (sym->value);
2450 e = gfc_get_expr ();
2451 e->expr_type = EXPR_VARIABLE;
2454 e->symtree = symtree;
2455 m = gfc_match_varspec (e, 0, false);
2457 if (sym->ts.is_c_interop || sym->ts.is_iso_c)
2460 /* Variable array references to derived type parameters cause
2461 all sorts of headaches in simplification. Treating such
2462 expressions as variable works just fine for all array
2464 if (sym->value && sym->ts.type == BT_DERIVED && e->ref)
2466 for (ref = e->ref; ref; ref = ref->next)
2467 if (ref->type == REF_ARRAY)
2470 if (ref == NULL || ref->u.ar.type == AR_FULL)
2476 e = gfc_get_expr ();
2477 e->expr_type = EXPR_VARIABLE;
2478 e->symtree = symtree;
2485 sym = gfc_use_derived (sym);
2489 m = gfc_match_structure_constructor (sym, &e, false);
2492 /* If we're here, then the name is known to be the name of a
2493 procedure, yet it is not sure to be the name of a function. */
2496 /* Procedure Pointer Assignments. */
2498 if (gfc_matching_procptr_assignment)
2500 gfc_gobble_whitespace ();
2501 if (sym->attr.function && gfc_peek_ascii_char () == '(')
2502 /* Parse functions returning a procptr. */
2505 if (sym->attr.flavor == FL_UNKNOWN) sym->attr.flavor = FL_PROCEDURE;
2506 if (gfc_is_intrinsic (sym, 0, gfc_current_locus)
2507 || gfc_is_intrinsic (sym, 1, gfc_current_locus))
2508 sym->attr.intrinsic = 1;
2509 e = gfc_get_expr ();
2510 e->expr_type = EXPR_VARIABLE;
2511 e->symtree = symtree;
2512 m = gfc_match_varspec (e, 0, false);
2516 if (sym->attr.subroutine)
2518 gfc_error ("Unexpected use of subroutine name '%s' at %C",
2524 /* At this point, the name has to be a non-statement function.
2525 If the name is the same as the current function being
2526 compiled, then we have a variable reference (to the function
2527 result) if the name is non-recursive. */
2529 st = gfc_enclosing_unit (NULL);
2531 if (st != NULL && st->state == COMP_FUNCTION
2533 && !sym->attr.recursive)
2535 e = gfc_get_expr ();
2536 e->symtree = symtree;
2537 e->expr_type = EXPR_VARIABLE;
2539 m = gfc_match_varspec (e, 0, false);
2543 /* Match a function reference. */
2545 m = gfc_match_actual_arglist (0, &actual_arglist);
2548 if (sym->attr.proc == PROC_ST_FUNCTION)
2549 gfc_error ("Statement function '%s' requires argument list at %C",
2552 gfc_error ("Function '%s' requires an argument list at %C",
2565 gfc_get_ha_sym_tree (name, &symtree); /* Can't fail */
2566 sym = symtree->n.sym;
2568 e = gfc_get_expr ();
2569 e->symtree = symtree;
2570 e->expr_type = EXPR_FUNCTION;
2571 e->value.function.actual = actual_arglist;
2572 e->where = gfc_current_locus;
2574 if (sym->as != NULL)
2575 e->rank = sym->as->rank;
2577 if (!sym->attr.function
2578 && gfc_add_function (&sym->attr, sym->name, NULL) == FAILURE)
2584 /* Check here for the existence of at least one argument for the
2585 iso_c_binding functions C_LOC, C_FUNLOC, and C_ASSOCIATED. The
2586 argument(s) given will be checked in gfc_iso_c_func_interface,
2587 during resolution of the function call. */
2588 if (sym->attr.is_iso_c == 1
2589 && (sym->from_intmod == INTMOD_ISO_C_BINDING
2590 && (sym->intmod_sym_id == ISOCBINDING_LOC
2591 || sym->intmod_sym_id == ISOCBINDING_FUNLOC
2592 || sym->intmod_sym_id == ISOCBINDING_ASSOCIATED)))
2594 /* make sure we were given a param */
2595 if (actual_arglist == NULL)
2597 gfc_error ("Missing argument to '%s' at %C", sym->name);
2603 if (sym->result == NULL)
2611 /* Special case for derived type variables that get their types
2612 via an IMPLICIT statement. This can't wait for the
2613 resolution phase. */
2615 if (gfc_peek_ascii_char () == '%'
2616 && sym->ts.type == BT_UNKNOWN
2617 && gfc_get_default_type (sym, sym->ns)->type == BT_DERIVED)
2618 gfc_set_default_type (sym, 0, sym->ns);
2620 /* If the symbol has a dimension attribute, the expression is a
2623 if (sym->attr.dimension)
2625 if (gfc_add_flavor (&sym->attr, FL_VARIABLE,
2626 sym->name, NULL) == FAILURE)
2632 e = gfc_get_expr ();
2633 e->symtree = symtree;
2634 e->expr_type = EXPR_VARIABLE;
2635 m = gfc_match_varspec (e, 0, false);
2639 /* Name is not an array, so we peek to see if a '(' implies a
2640 function call or a substring reference. Otherwise the
2641 variable is just a scalar. */
2643 gfc_gobble_whitespace ();
2644 if (gfc_peek_ascii_char () != '(')
2646 /* Assume a scalar variable */
2647 e = gfc_get_expr ();
2648 e->symtree = symtree;
2649 e->expr_type = EXPR_VARIABLE;
2651 if (gfc_add_flavor (&sym->attr, FL_VARIABLE,
2652 sym->name, NULL) == FAILURE)
2658 /*FIXME:??? gfc_match_varspec does set this for us: */
2660 m = gfc_match_varspec (e, 0, false);
2664 /* See if this is a function reference with a keyword argument
2665 as first argument. We do this because otherwise a spurious
2666 symbol would end up in the symbol table. */
2668 old_loc = gfc_current_locus;
2669 m2 = gfc_match (" ( %n =", argname);
2670 gfc_current_locus = old_loc;
2672 e = gfc_get_expr ();
2673 e->symtree = symtree;
2675 if (m2 != MATCH_YES)
2677 /* Try to figure out whether we're dealing with a character type.
2678 We're peeking ahead here, because we don't want to call
2679 match_substring if we're dealing with an implicitly typed
2680 non-character variable. */
2681 implicit_char = false;
2682 if (sym->ts.type == BT_UNKNOWN)
2684 ts = gfc_get_default_type (sym,NULL);
2685 if (ts->type == BT_CHARACTER)
2686 implicit_char = true;
2689 /* See if this could possibly be a substring reference of a name
2690 that we're not sure is a variable yet. */
2692 if ((implicit_char || sym->ts.type == BT_CHARACTER)
2693 && match_substring (sym->ts.cl, 0, &e->ref) == MATCH_YES)
2696 e->expr_type = EXPR_VARIABLE;
2698 if (sym->attr.flavor != FL_VARIABLE
2699 && gfc_add_flavor (&sym->attr, FL_VARIABLE,
2700 sym->name, NULL) == FAILURE)
2706 if (sym->ts.type == BT_UNKNOWN
2707 && gfc_set_default_type (sym, 1, NULL) == FAILURE)
2721 /* Give up, assume we have a function. */
2723 gfc_get_sym_tree (name, NULL, &symtree); /* Can't fail */
2724 sym = symtree->n.sym;
2725 e->expr_type = EXPR_FUNCTION;
2727 if (!sym->attr.function
2728 && gfc_add_function (&sym->attr, sym->name, NULL) == FAILURE)
2736 m = gfc_match_actual_arglist (0, &e->value.function.actual);
2738 gfc_error ("Missing argument list in function '%s' at %C", sym->name);
2746 /* If our new function returns a character, array or structure
2747 type, it might have subsequent references. */
2749 m = gfc_match_varspec (e, 0, false);
2756 gfc_get_sym_tree (name, NULL, &symtree); /* Can't fail */
2758 e = gfc_get_expr ();
2759 e->symtree = symtree;
2760 e->expr_type = EXPR_FUNCTION;
2762 m = gfc_match_actual_arglist (0, &e->value.function.actual);
2766 gfc_error ("Symbol at %C is not appropriate for an expression");
2782 /* Match a variable, i.e. something that can be assigned to. This
2783 starts as a symbol, can be a structure component or an array
2784 reference. It can be a function if the function doesn't have a
2785 separate RESULT variable. If the symbol has not been previously
2786 seen, we assume it is a variable.
2788 This function is called by two interface functions:
2789 gfc_match_variable, which has host_flag = 1, and
2790 gfc_match_equiv_variable, with host_flag = 0, to restrict the
2791 match of the symbol to the local scope. */
2794 match_variable (gfc_expr **result, int equiv_flag, int host_flag)
2802 /* Since nothing has any business being an lvalue in a module
2803 specification block, an interface block or a contains section,
2804 we force the changed_symbols mechanism to work by setting
2805 host_flag to 0. This prevents valid symbols that have the name
2806 of keywords, such as 'end', being turned into variables by
2807 failed matching to assignments for, e.g., END INTERFACE. */
2808 if (gfc_current_state () == COMP_MODULE
2809 || gfc_current_state () == COMP_INTERFACE
2810 || gfc_current_state () == COMP_CONTAINS)
2813 m = gfc_match_sym_tree (&st, host_flag);
2816 where = gfc_current_locus;
2820 /* If this is an implicit do loop index and implicitly typed,
2821 it should not be host associated. */
2822 m = check_for_implicit_index (&st, &sym);
2826 sym->attr.implied_index = 0;
2828 gfc_set_sym_referenced (sym);
2829 switch (sym->attr.flavor)
2832 if (sym->attr.is_protected && sym->attr.use_assoc)
2834 gfc_error ("Assigning to PROTECTED variable at %C");
2841 sym_flavor flavor = FL_UNKNOWN;
2843 gfc_gobble_whitespace ();
2845 if (sym->attr.external || sym->attr.procedure
2846 || sym->attr.function || sym->attr.subroutine)
2847 flavor = FL_PROCEDURE;
2849 /* If it is not a procedure, is not typed and is host associated,
2850 we cannot give it a flavor yet. */
2851 else if (sym->ns == gfc_current_ns->parent
2852 && sym->ts.type == BT_UNKNOWN)
2855 /* These are definitive indicators that this is a variable. */
2856 else if (gfc_peek_ascii_char () != '(' || sym->ts.type != BT_UNKNOWN
2857 || sym->attr.pointer || sym->as != NULL)
2858 flavor = FL_VARIABLE;
2860 if (flavor != FL_UNKNOWN
2861 && gfc_add_flavor (&sym->attr, flavor, sym->name, NULL) == FAILURE)
2868 gfc_error ("Named constant at %C in an EQUIVALENCE");
2870 gfc_error ("Cannot assign to a named constant at %C");
2875 /* Check for a nonrecursive function result variable. */
2876 if (sym->attr.function
2877 && !sym->attr.external
2878 && sym->result == sym
2879 && ((sym == gfc_current_ns->proc_name
2880 && sym == gfc_current_ns->proc_name->result)
2881 || (gfc_current_ns->parent
2882 && sym == gfc_current_ns->parent->proc_name->result)
2884 && sym->ns == gfc_current_ns)
2886 && sym->ns == gfc_current_ns->parent)))
2888 /* If a function result is a derived type, then the derived
2889 type may still have to be resolved. */
2891 if (sym->ts.type == BT_DERIVED
2892 && gfc_use_derived (sym->ts.derived) == NULL)
2897 if (sym->attr.proc_pointer)
2900 /* Fall through to error */
2903 gfc_error ("'%s' at %C is not a variable", sym->name);
2907 /* Special case for derived type variables that get their types
2908 via an IMPLICIT statement. This can't wait for the
2909 resolution phase. */
2912 gfc_namespace * implicit_ns;
2914 if (gfc_current_ns->proc_name == sym)
2915 implicit_ns = gfc_current_ns;
2917 implicit_ns = sym->ns;
2919 if (gfc_peek_ascii_char () == '%'
2920 && sym->ts.type == BT_UNKNOWN
2921 && gfc_get_default_type (sym, implicit_ns)->type == BT_DERIVED)
2922 gfc_set_default_type (sym, 0, implicit_ns);
2925 expr = gfc_get_expr ();
2927 expr->expr_type = EXPR_VARIABLE;
2930 expr->where = where;
2932 /* Now see if we have to do more. */
2933 m = gfc_match_varspec (expr, equiv_flag, false);
2936 gfc_free_expr (expr);
2946 gfc_match_variable (gfc_expr **result, int equiv_flag)
2948 return match_variable (result, equiv_flag, 1);
2953 gfc_match_equiv_variable (gfc_expr **result)
2955 return match_variable (result, 1, 0);