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 gfc_gobble_whitespace ();
1364 where = gfc_current_locus;
1366 switch (gfc_match_name (name))
1375 w = gfc_current_locus;
1376 gfc_gobble_whitespace ();
1377 c = gfc_next_ascii_char ();
1378 gfc_current_locus = w;
1380 if (c != ',' && c != ')')
1383 if (gfc_find_sym_tree (name, NULL, 1, &symtree))
1385 /* Handle error elsewhere. */
1387 /* Eliminate a couple of common cases where we know we don't
1388 have a function argument. */
1389 if (symtree == NULL)
1391 gfc_get_sym_tree (name, NULL, &symtree);
1392 gfc_set_sym_referenced (symtree->n.sym);
1398 sym = symtree->n.sym;
1399 gfc_set_sym_referenced (sym);
1400 if (sym->attr.flavor != FL_PROCEDURE
1401 && sym->attr.flavor != FL_UNKNOWN)
1404 if (sym->attr.in_common && !sym->attr.proc_pointer)
1406 gfc_add_flavor (&sym->attr, FL_VARIABLE, sym->name,
1411 /* If the symbol is a function with itself as the result and
1412 is being defined, then we have a variable. */
1413 if (sym->attr.function && sym->result == sym)
1415 if (gfc_current_ns->proc_name == sym
1416 || (gfc_current_ns->parent != NULL
1417 && gfc_current_ns->parent->proc_name == sym))
1421 && (sym->ns == gfc_current_ns
1422 || sym->ns == gfc_current_ns->parent))
1424 gfc_entry_list *el = NULL;
1426 for (el = sym->ns->entries; el; el = el->next)
1436 e = gfc_get_expr (); /* Leave it unknown for now */
1437 e->symtree = symtree;
1438 e->expr_type = EXPR_VARIABLE;
1439 e->ts.type = BT_PROCEDURE;
1446 gfc_current_locus = where;
1447 return gfc_match_expr (result);
1451 /* Match a keyword argument. */
1454 match_keyword_arg (gfc_actual_arglist *actual, gfc_actual_arglist *base)
1456 char name[GFC_MAX_SYMBOL_LEN + 1];
1457 gfc_actual_arglist *a;
1461 name_locus = gfc_current_locus;
1462 m = gfc_match_name (name);
1466 if (gfc_match_char ('=') != MATCH_YES)
1472 m = match_actual_arg (&actual->expr);
1476 /* Make sure this name has not appeared yet. */
1478 if (name[0] != '\0')
1480 for (a = base; a; a = a->next)
1481 if (a->name != NULL && strcmp (a->name, name) == 0)
1483 gfc_error ("Keyword '%s' at %C has already appeared in the "
1484 "current argument list", name);
1489 actual->name = gfc_get_string (name);
1493 gfc_current_locus = name_locus;
1498 /* Match an argument list function, such as %VAL. */
1501 match_arg_list_function (gfc_actual_arglist *result)
1503 char name[GFC_MAX_SYMBOL_LEN + 1];
1507 old_locus = gfc_current_locus;
1509 if (gfc_match_char ('%') != MATCH_YES)
1515 m = gfc_match ("%n (", name);
1519 if (name[0] != '\0')
1524 if (strncmp (name, "loc", 3) == 0)
1526 result->name = "%LOC";
1530 if (strncmp (name, "ref", 3) == 0)
1532 result->name = "%REF";
1536 if (strncmp (name, "val", 3) == 0)
1538 result->name = "%VAL";
1547 if (gfc_notify_std (GFC_STD_GNU, "Extension: argument list "
1548 "function at %C") == FAILURE)
1554 m = match_actual_arg (&result->expr);
1558 if (gfc_match_char (')') != MATCH_YES)
1567 gfc_current_locus = old_locus;
1572 /* Matches an actual argument list of a function or subroutine, from
1573 the opening parenthesis to the closing parenthesis. The argument
1574 list is assumed to allow keyword arguments because we don't know if
1575 the symbol associated with the procedure has an implicit interface
1576 or not. We make sure keywords are unique. If sub_flag is set,
1577 we're matching the argument list of a subroutine. */
1580 gfc_match_actual_arglist (int sub_flag, gfc_actual_arglist **argp)
1582 gfc_actual_arglist *head, *tail;
1584 gfc_st_label *label;
1588 *argp = tail = NULL;
1589 old_loc = gfc_current_locus;
1593 if (gfc_match_char ('(') == MATCH_NO)
1594 return (sub_flag) ? MATCH_YES : MATCH_NO;
1596 if (gfc_match_char (')') == MATCH_YES)
1603 head = tail = gfc_get_actual_arglist ();
1606 tail->next = gfc_get_actual_arglist ();
1610 if (sub_flag && gfc_match_char ('*') == MATCH_YES)
1612 m = gfc_match_st_label (&label);
1614 gfc_error ("Expected alternate return label at %C");
1618 tail->label = label;
1622 /* After the first keyword argument is seen, the following
1623 arguments must also have keywords. */
1626 m = match_keyword_arg (tail, head);
1628 if (m == MATCH_ERROR)
1632 gfc_error ("Missing keyword name in actual argument list at %C");
1639 /* Try an argument list function, like %VAL. */
1640 m = match_arg_list_function (tail);
1641 if (m == MATCH_ERROR)
1644 /* See if we have the first keyword argument. */
1647 m = match_keyword_arg (tail, head);
1650 if (m == MATCH_ERROR)
1656 /* Try for a non-keyword argument. */
1657 m = match_actual_arg (&tail->expr);
1658 if (m == MATCH_ERROR)
1667 if (gfc_match_char (')') == MATCH_YES)
1669 if (gfc_match_char (',') != MATCH_YES)
1677 gfc_error ("Syntax error in argument list at %C");
1680 gfc_free_actual_arglist (head);
1681 gfc_current_locus = old_loc;
1687 /* Used by gfc_match_varspec() to extend the reference list by one
1691 extend_ref (gfc_expr *primary, gfc_ref *tail)
1693 if (primary->ref == NULL)
1694 primary->ref = tail = gfc_get_ref ();
1698 gfc_internal_error ("extend_ref(): Bad tail");
1699 tail->next = gfc_get_ref ();
1707 /* Match any additional specifications associated with the current
1708 variable like member references or substrings. If equiv_flag is
1709 set we only match stuff that is allowed inside an EQUIVALENCE
1710 statement. sub_flag tells whether we expect a type-bound procedure found
1711 to be a subroutine as part of CALL or a FUNCTION. For procedure pointer
1712 components, 'ppc_arg' determines whether the PPC may be called (with an
1713 argument list), or whether it may just be referred to as a pointer. */
1716 gfc_match_varspec (gfc_expr *primary, int equiv_flag, bool sub_flag,
1719 char name[GFC_MAX_SYMBOL_LEN + 1];
1720 gfc_ref *substring, *tail;
1721 gfc_component *component;
1722 gfc_symbol *sym = primary->symtree->n.sym;
1728 gfc_gobble_whitespace ();
1729 if ((equiv_flag && gfc_peek_ascii_char () == '(')
1730 || (sym->attr.dimension && !sym->attr.proc_pointer))
1732 /* In EQUIVALENCE, we don't know yet whether we are seeing
1733 an array, character variable or array of character
1734 variables. We'll leave the decision till resolve time. */
1735 tail = extend_ref (primary, tail);
1736 tail->type = REF_ARRAY;
1738 m = gfc_match_array_ref (&tail->u.ar, equiv_flag ? NULL : sym->as,
1743 gfc_gobble_whitespace ();
1744 if (equiv_flag && gfc_peek_ascii_char () == '(')
1746 tail = extend_ref (primary, tail);
1747 tail->type = REF_ARRAY;
1749 m = gfc_match_array_ref (&tail->u.ar, NULL, equiv_flag);
1755 primary->ts = sym->ts;
1760 if (sym->ts.type == BT_UNKNOWN && gfc_peek_ascii_char () == '%'
1761 && gfc_get_default_type (sym->name, sym->ns)->type == BT_DERIVED)
1762 gfc_set_default_type (sym, 0, sym->ns);
1764 if (sym->ts.type != BT_DERIVED || gfc_match_char ('%') != MATCH_YES)
1765 goto check_substring;
1767 sym = sym->ts.derived;
1774 m = gfc_match_name (name);
1776 gfc_error ("Expected structure component name at %C");
1780 tbp = gfc_find_typebound_proc (sym, &t, name, false);
1783 gfc_symbol* tbp_sym;
1788 gcc_assert (!tail || !tail->next);
1789 gcc_assert (primary->expr_type == EXPR_VARIABLE);
1791 if (tbp->n.tb->is_generic)
1794 tbp_sym = tbp->n.tb->u.specific->n.sym;
1796 primary->expr_type = EXPR_COMPCALL;
1797 primary->value.compcall.tbp = tbp->n.tb;
1798 primary->value.compcall.name = tbp->name;
1799 gcc_assert (primary->symtree->n.sym->attr.referenced);
1801 primary->ts = tbp_sym->ts;
1803 m = gfc_match_actual_arglist (tbp->n.tb->subroutine,
1804 &primary->value.compcall.actual);
1805 if (m == MATCH_ERROR)
1810 primary->value.compcall.actual = NULL;
1813 gfc_error ("Expected argument list at %C");
1821 component = gfc_find_component (sym, name, false, false);
1822 if (component == NULL)
1825 tail = extend_ref (primary, tail);
1826 tail->type = REF_COMPONENT;
1828 tail->u.c.component = component;
1829 tail->u.c.sym = sym;
1831 primary->ts = component->ts;
1833 if (component->attr.proc_pointer && ppc_arg
1834 && !gfc_matching_procptr_assignment)
1836 primary->expr_type = EXPR_PPC;
1837 m = gfc_match_actual_arglist (component->attr.subroutine,
1838 &primary->value.compcall.actual);
1839 if (m == MATCH_ERROR)
1842 primary->value.compcall.actual = NULL;
1847 if (component->as != NULL && !component->attr.proc_pointer)
1849 tail = extend_ref (primary, tail);
1850 tail->type = REF_ARRAY;
1852 m = gfc_match_array_ref (&tail->u.ar, component->as, equiv_flag);
1857 if (component->ts.type != BT_DERIVED
1858 || gfc_match_char ('%') != MATCH_YES)
1861 sym = component->ts.derived;
1866 if (primary->ts.type == BT_UNKNOWN)
1868 if (gfc_get_default_type (sym->name, sym->ns)->type == BT_CHARACTER)
1870 gfc_set_default_type (sym, 0, sym->ns);
1871 primary->ts = sym->ts;
1876 if (primary->ts.type == BT_CHARACTER)
1878 switch (match_substring (primary->ts.cl, equiv_flag, &substring))
1882 primary->ref = substring;
1884 tail->next = substring;
1886 if (primary->expr_type == EXPR_CONSTANT)
1887 primary->expr_type = EXPR_SUBSTRING;
1890 primary->ts.cl = NULL;
1897 gfc_clear_ts (&primary->ts);
1898 gfc_clear_ts (&sym->ts);
1911 /* Given an expression that is a variable, figure out what the
1912 ultimate variable's type and attribute is, traversing the reference
1913 structures if necessary.
1915 This subroutine is trickier than it looks. We start at the base
1916 symbol and store the attribute. Component references load a
1917 completely new attribute.
1919 A couple of rules come into play. Subobjects of targets are always
1920 targets themselves. If we see a component that goes through a
1921 pointer, then the expression must also be a target, since the
1922 pointer is associated with something (if it isn't core will soon be
1923 dumped). If we see a full part or section of an array, the
1924 expression is also an array.
1926 We can have at most one full array reference. */
1929 gfc_variable_attr (gfc_expr *expr, gfc_typespec *ts)
1931 int dimension, pointer, allocatable, target;
1932 symbol_attribute attr;
1935 if (expr->expr_type != EXPR_VARIABLE)
1936 gfc_internal_error ("gfc_variable_attr(): Expression isn't a variable");
1939 attr = expr->symtree->n.sym->attr;
1941 dimension = attr.dimension;
1942 pointer = attr.pointer;
1943 allocatable = attr.allocatable;
1945 target = attr.target;
1946 if (pointer || attr.proc_pointer)
1949 if (ts != NULL && expr->ts.type == BT_UNKNOWN)
1950 *ts = expr->symtree->n.sym->ts;
1952 for (; ref; ref = ref->next)
1957 switch (ref->u.ar.type)
1964 allocatable = pointer = 0;
1969 allocatable = pointer = 0;
1973 gfc_internal_error ("gfc_variable_attr(): Bad array reference");
1979 attr = ref->u.c.component->attr;
1982 *ts = ref->u.c.component->ts;
1983 /* Don't set the string length if a substring reference
1985 if (ts->type == BT_CHARACTER
1986 && ref->next && ref->next->type == REF_SUBSTRING)
1990 pointer = ref->u.c.component->attr.pointer;
1991 allocatable = ref->u.c.component->attr.allocatable;
1992 if (pointer || attr.proc_pointer)
1998 allocatable = pointer = 0;
2002 attr.dimension = dimension;
2003 attr.pointer = pointer;
2004 attr.allocatable = allocatable;
2005 attr.target = target;
2011 /* Return the attribute from a general expression. */
2014 gfc_expr_attr (gfc_expr *e)
2016 symbol_attribute attr;
2018 switch (e->expr_type)
2021 attr = gfc_variable_attr (e, NULL);
2025 gfc_clear_attr (&attr);
2027 if (e->value.function.esym != NULL)
2028 attr = e->value.function.esym->result->attr;
2030 /* TODO: NULL() returns pointers. May have to take care of this
2036 gfc_clear_attr (&attr);
2044 /* Match a structure constructor. The initial symbol has already been
2047 typedef struct gfc_structure_ctor_component
2052 struct gfc_structure_ctor_component* next;
2054 gfc_structure_ctor_component;
2056 #define gfc_get_structure_ctor_component() XCNEW (gfc_structure_ctor_component)
2059 gfc_free_structure_ctor_component (gfc_structure_ctor_component *comp)
2061 gfc_free (comp->name);
2062 gfc_free_expr (comp->val);
2066 /* Translate the component list into the actual constructor by sorting it in
2067 the order required; this also checks along the way that each and every
2068 component actually has an initializer and handles default initializers
2069 for components without explicit value given. */
2071 build_actual_constructor (gfc_structure_ctor_component **comp_head,
2072 gfc_constructor **ctor_head, gfc_symbol *sym)
2074 gfc_structure_ctor_component *comp_iter;
2075 gfc_constructor *ctor_tail = NULL;
2076 gfc_component *comp;
2078 for (comp = sym->components; comp; comp = comp->next)
2080 gfc_structure_ctor_component **next_ptr;
2081 gfc_expr *value = NULL;
2083 /* Try to find the initializer for the current component by name. */
2084 next_ptr = comp_head;
2085 for (comp_iter = *comp_head; comp_iter; comp_iter = comp_iter->next)
2087 if (!strcmp (comp_iter->name, comp->name))
2089 next_ptr = &comp_iter->next;
2092 /* If an extension, try building the parent derived type by building
2093 a value expression for the parent derived type and calling self. */
2094 if (!comp_iter && comp == sym->components && sym->attr.extension)
2096 value = gfc_get_expr ();
2097 value->expr_type = EXPR_STRUCTURE;
2098 value->value.constructor = NULL;
2099 value->ts = comp->ts;
2100 value->where = gfc_current_locus;
2102 if (build_actual_constructor (comp_head, &value->value.constructor,
2103 comp->ts.derived) == FAILURE)
2105 gfc_free_expr (value);
2108 *ctor_head = ctor_tail = gfc_get_constructor ();
2109 ctor_tail->expr = value;
2113 /* If it was not found, try the default initializer if there's any;
2114 otherwise, it's an error. */
2117 if (comp->initializer)
2119 if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: Structure"
2120 " constructor with missing optional arguments"
2121 " at %C") == FAILURE)
2123 value = gfc_copy_expr (comp->initializer);
2127 gfc_error ("No initializer for component '%s' given in the"
2128 " structure constructor at %C!", comp->name);
2133 value = comp_iter->val;
2135 /* Add the value to the constructor chain built. */
2138 ctor_tail->next = gfc_get_constructor ();
2139 ctor_tail = ctor_tail->next;
2142 *ctor_head = ctor_tail = gfc_get_constructor ();
2144 ctor_tail->expr = value;
2146 /* Remove the entry from the component list. We don't want the expression
2147 value to be free'd, so set it to NULL. */
2150 *next_ptr = comp_iter->next;
2151 comp_iter->val = NULL;
2152 gfc_free_structure_ctor_component (comp_iter);
2159 gfc_match_structure_constructor (gfc_symbol *sym, gfc_expr **result,
2162 gfc_structure_ctor_component *comp_tail, *comp_head, *comp_iter;
2163 gfc_constructor *ctor_head, *ctor_tail;
2164 gfc_component *comp; /* Is set NULL when named component is first seen */
2168 const char* last_name = NULL;
2170 comp_tail = comp_head = NULL;
2171 ctor_head = ctor_tail = NULL;
2173 if (!parent && gfc_match_char ('(') != MATCH_YES)
2176 where = gfc_current_locus;
2178 gfc_find_component (sym, NULL, false, true);
2180 /* Check that we're not about to construct an ABSTRACT type. */
2181 if (!parent && sym->attr.abstract)
2183 gfc_error ("Can't construct ABSTRACT type '%s' at %C", sym->name);
2187 /* Match the component list and store it in a list together with the
2188 corresponding component names. Check for empty argument list first. */
2189 if (gfc_match_char (')') != MATCH_YES)
2191 comp = sym->components;
2194 gfc_component *this_comp = NULL;
2197 comp_tail = comp_head = gfc_get_structure_ctor_component ();
2200 comp_tail->next = gfc_get_structure_ctor_component ();
2201 comp_tail = comp_tail->next;
2203 comp_tail->name = XCNEWVEC (char, GFC_MAX_SYMBOL_LEN + 1);
2204 comp_tail->val = NULL;
2205 comp_tail->where = gfc_current_locus;
2207 /* Try matching a component name. */
2208 if (gfc_match_name (comp_tail->name) == MATCH_YES
2209 && gfc_match_char ('=') == MATCH_YES)
2211 if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: Structure"
2212 " constructor with named arguments at %C")
2216 last_name = comp_tail->name;
2221 /* Components without name are not allowed after the first named
2222 component initializer! */
2226 gfc_error ("Component initializer without name after"
2227 " component named %s at %C!", last_name);
2229 gfc_error ("Too many components in structure constructor at"
2234 gfc_current_locus = comp_tail->where;
2235 strncpy (comp_tail->name, comp->name, GFC_MAX_SYMBOL_LEN + 1);
2238 /* Find the current component in the structure definition and check
2239 its access is not private. */
2241 this_comp = gfc_find_component (sym, comp->name, false, false);
2244 this_comp = gfc_find_component (sym,
2245 (const char *)comp_tail->name,
2247 comp = NULL; /* Reset needed! */
2250 /* Here we can check if a component name is given which does not
2251 correspond to any component of the defined structure. */
2255 /* Check if this component is already given a value. */
2256 for (comp_iter = comp_head; comp_iter != comp_tail;
2257 comp_iter = comp_iter->next)
2259 gcc_assert (comp_iter);
2260 if (!strcmp (comp_iter->name, comp_tail->name))
2262 gfc_error ("Component '%s' is initialized twice in the"
2263 " structure constructor at %C!", comp_tail->name);
2268 /* Match the current initializer expression. */
2269 m = gfc_match_expr (&comp_tail->val);
2272 if (m == MATCH_ERROR)
2275 /* If not explicitly a parent constructor, gather up the components
2277 if (comp && comp == sym->components
2278 && sym->attr.extension
2279 && (comp_tail->val->ts.type != BT_DERIVED
2281 comp_tail->val->ts.derived != this_comp->ts.derived))
2283 gfc_current_locus = where;
2284 gfc_free_expr (comp_tail->val);
2285 comp_tail->val = NULL;
2287 m = gfc_match_structure_constructor (comp->ts.derived,
2288 &comp_tail->val, true);
2291 if (m == MATCH_ERROR)
2298 if (parent && !comp)
2302 while (gfc_match_char (',') == MATCH_YES);
2304 if (!parent && gfc_match_char (')') != MATCH_YES)
2308 if (build_actual_constructor (&comp_head, &ctor_head, sym) == FAILURE)
2311 /* No component should be left, as this should have caused an error in the
2312 loop constructing the component-list (name that does not correspond to any
2313 component in the structure definition). */
2314 if (comp_head && sym->attr.extension)
2316 for (comp_iter = comp_head; comp_iter; comp_iter = comp_iter->next)
2318 gfc_error ("component '%s' at %L has already been set by a "
2319 "parent derived type constructor", comp_iter->name,
2325 gcc_assert (!comp_head);
2327 e = gfc_get_expr ();
2329 e->expr_type = EXPR_STRUCTURE;
2331 e->ts.type = BT_DERIVED;
2332 e->ts.derived = sym;
2335 e->value.constructor = ctor_head;
2341 gfc_error ("Syntax error in structure constructor at %C");
2344 for (comp_iter = comp_head; comp_iter; )
2346 gfc_structure_ctor_component *next = comp_iter->next;
2347 gfc_free_structure_ctor_component (comp_iter);
2350 gfc_free_constructor (ctor_head);
2355 /* If the symbol is an implicit do loop index and implicitly typed,
2356 it should not be host associated. Provide a symtree from the
2357 current namespace. */
2359 check_for_implicit_index (gfc_symtree **st, gfc_symbol **sym)
2361 if ((*sym)->attr.flavor == FL_VARIABLE
2362 && (*sym)->ns != gfc_current_ns
2363 && (*sym)->attr.implied_index
2364 && (*sym)->attr.implicit_type
2365 && !(*sym)->attr.use_assoc)
2368 i = gfc_get_sym_tree ((*sym)->name, NULL, st);
2371 *sym = (*st)->n.sym;
2377 /* Procedure pointer as function result: Replace the function symbol by the
2378 auto-generated hidden result variable named "ppr@". */
2381 replace_hidden_procptr_result (gfc_symbol **sym, gfc_symtree **st)
2383 /* Check for procedure pointer result variable. */
2384 if ((*sym)->attr.function && !(*sym)->attr.external
2385 && (*sym)->result && (*sym)->result != *sym
2386 && (*sym)->result->attr.proc_pointer
2387 && (*sym) == gfc_current_ns->proc_name
2388 && (*sym) == (*sym)->result->ns->proc_name
2389 && strcmp ("ppr@", (*sym)->result->name) == 0)
2391 /* Automatic replacement with "hidden" result variable. */
2392 (*sym)->result->attr.referenced = (*sym)->attr.referenced;
2393 *sym = (*sym)->result;
2394 *st = gfc_find_symtree ((*sym)->ns->sym_root, (*sym)->name);
2401 /* Matches a variable name followed by anything that might follow it--
2402 array reference, argument list of a function, etc. */
2405 gfc_match_rvalue (gfc_expr **result)
2407 gfc_actual_arglist *actual_arglist;
2408 char name[GFC_MAX_SYMBOL_LEN + 1], argname[GFC_MAX_SYMBOL_LEN + 1];
2411 gfc_symtree *symtree;
2412 locus where, old_loc;
2420 m = gfc_match_name (name);
2424 if (gfc_find_state (COMP_INTERFACE) == SUCCESS
2425 && !gfc_current_ns->has_import_set)
2426 i = gfc_get_sym_tree (name, NULL, &symtree);
2428 i = gfc_get_ha_sym_tree (name, &symtree);
2433 sym = symtree->n.sym;
2435 where = gfc_current_locus;
2437 replace_hidden_procptr_result (&sym, &symtree);
2439 /* If this is an implicit do loop index and implicitly typed,
2440 it should not be host associated. */
2441 m = check_for_implicit_index (&symtree, &sym);
2445 gfc_set_sym_referenced (sym);
2446 sym->attr.implied_index = 0;
2448 if (sym->attr.function && sym->result == sym)
2450 /* See if this is a directly recursive function call. */
2451 gfc_gobble_whitespace ();
2452 if (sym->attr.recursive
2453 && gfc_peek_ascii_char () == '('
2454 && gfc_current_ns->proc_name == sym
2455 && !sym->attr.dimension)
2457 gfc_error ("'%s' at %C is the name of a recursive function "
2458 "and so refers to the result variable. Use an "
2459 "explicit RESULT variable for direct recursion "
2460 "(12.5.2.1)", sym->name);
2464 if (gfc_current_ns->proc_name == sym
2465 || (gfc_current_ns->parent != NULL
2466 && gfc_current_ns->parent->proc_name == sym))
2470 && (sym->ns == gfc_current_ns
2471 || sym->ns == gfc_current_ns->parent))
2473 gfc_entry_list *el = NULL;
2475 for (el = sym->ns->entries; el; el = el->next)
2481 if (gfc_matching_procptr_assignment)
2484 if (sym->attr.function || sym->attr.external || sym->attr.intrinsic)
2487 if (sym->attr.generic)
2488 goto generic_function;
2490 switch (sym->attr.flavor)
2494 e = gfc_get_expr ();
2496 e->expr_type = EXPR_VARIABLE;
2497 e->symtree = symtree;
2499 m = gfc_match_varspec (e, 0, false, true);
2503 /* A statement of the form "REAL, parameter :: a(0:10) = 1" will
2504 end up here. Unfortunately, sym->value->expr_type is set to
2505 EXPR_CONSTANT, and so the if () branch would be followed without
2506 the !sym->as check. */
2507 if (sym->value && sym->value->expr_type != EXPR_ARRAY && !sym->as)
2508 e = gfc_copy_expr (sym->value);
2511 e = gfc_get_expr ();
2512 e->expr_type = EXPR_VARIABLE;
2515 e->symtree = symtree;
2516 m = gfc_match_varspec (e, 0, false, true);
2518 if (sym->ts.is_c_interop || sym->ts.is_iso_c)
2521 /* Variable array references to derived type parameters cause
2522 all sorts of headaches in simplification. Treating such
2523 expressions as variable works just fine for all array
2525 if (sym->value && sym->ts.type == BT_DERIVED && e->ref)
2527 for (ref = e->ref; ref; ref = ref->next)
2528 if (ref->type == REF_ARRAY)
2531 if (ref == NULL || ref->u.ar.type == AR_FULL)
2537 e = gfc_get_expr ();
2538 e->expr_type = EXPR_VARIABLE;
2539 e->symtree = symtree;
2546 sym = gfc_use_derived (sym);
2550 m = gfc_match_structure_constructor (sym, &e, false);
2553 /* If we're here, then the name is known to be the name of a
2554 procedure, yet it is not sure to be the name of a function. */
2557 /* Procedure Pointer Assignments. */
2559 if (gfc_matching_procptr_assignment)
2561 gfc_gobble_whitespace ();
2562 if (!sym->attr.dimension && gfc_peek_ascii_char () == '(')
2563 /* Parse functions returning a procptr. */
2566 if (gfc_is_intrinsic (sym, 0, gfc_current_locus)
2567 || gfc_is_intrinsic (sym, 1, gfc_current_locus))
2568 sym->attr.intrinsic = 1;
2569 e = gfc_get_expr ();
2570 e->expr_type = EXPR_VARIABLE;
2571 e->symtree = symtree;
2572 m = gfc_match_varspec (e, 0, false, true);
2576 if (sym->attr.subroutine)
2578 gfc_error ("Unexpected use of subroutine name '%s' at %C",
2584 /* At this point, the name has to be a non-statement function.
2585 If the name is the same as the current function being
2586 compiled, then we have a variable reference (to the function
2587 result) if the name is non-recursive. */
2589 st = gfc_enclosing_unit (NULL);
2591 if (st != NULL && st->state == COMP_FUNCTION
2593 && !sym->attr.recursive)
2595 e = gfc_get_expr ();
2596 e->symtree = symtree;
2597 e->expr_type = EXPR_VARIABLE;
2599 m = gfc_match_varspec (e, 0, false, true);
2603 /* Match a function reference. */
2605 m = gfc_match_actual_arglist (0, &actual_arglist);
2608 if (sym->attr.proc == PROC_ST_FUNCTION)
2609 gfc_error ("Statement function '%s' requires argument list at %C",
2612 gfc_error ("Function '%s' requires an argument list at %C",
2625 gfc_get_ha_sym_tree (name, &symtree); /* Can't fail */
2626 sym = symtree->n.sym;
2628 replace_hidden_procptr_result (&sym, &symtree);
2630 e = gfc_get_expr ();
2631 e->symtree = symtree;
2632 e->expr_type = EXPR_FUNCTION;
2633 e->value.function.actual = actual_arglist;
2634 e->where = gfc_current_locus;
2636 if (sym->as != NULL)
2637 e->rank = sym->as->rank;
2639 if (!sym->attr.function
2640 && gfc_add_function (&sym->attr, sym->name, NULL) == FAILURE)
2646 /* Check here for the existence of at least one argument for the
2647 iso_c_binding functions C_LOC, C_FUNLOC, and C_ASSOCIATED. The
2648 argument(s) given will be checked in gfc_iso_c_func_interface,
2649 during resolution of the function call. */
2650 if (sym->attr.is_iso_c == 1
2651 && (sym->from_intmod == INTMOD_ISO_C_BINDING
2652 && (sym->intmod_sym_id == ISOCBINDING_LOC
2653 || sym->intmod_sym_id == ISOCBINDING_FUNLOC
2654 || sym->intmod_sym_id == ISOCBINDING_ASSOCIATED)))
2656 /* make sure we were given a param */
2657 if (actual_arglist == NULL)
2659 gfc_error ("Missing argument to '%s' at %C", sym->name);
2665 if (sym->result == NULL)
2673 /* Special case for derived type variables that get their types
2674 via an IMPLICIT statement. This can't wait for the
2675 resolution phase. */
2677 if (gfc_peek_ascii_char () == '%'
2678 && sym->ts.type == BT_UNKNOWN
2679 && gfc_get_default_type (sym->name, sym->ns)->type == BT_DERIVED)
2680 gfc_set_default_type (sym, 0, sym->ns);
2682 /* If the symbol has a dimension attribute, the expression is a
2685 if (sym->attr.dimension)
2687 if (gfc_add_flavor (&sym->attr, FL_VARIABLE,
2688 sym->name, NULL) == FAILURE)
2694 e = gfc_get_expr ();
2695 e->symtree = symtree;
2696 e->expr_type = EXPR_VARIABLE;
2697 m = gfc_match_varspec (e, 0, false, true);
2701 /* Name is not an array, so we peek to see if a '(' implies a
2702 function call or a substring reference. Otherwise the
2703 variable is just a scalar. */
2705 gfc_gobble_whitespace ();
2706 if (gfc_peek_ascii_char () != '(')
2708 /* Assume a scalar variable */
2709 e = gfc_get_expr ();
2710 e->symtree = symtree;
2711 e->expr_type = EXPR_VARIABLE;
2713 if (gfc_add_flavor (&sym->attr, FL_VARIABLE,
2714 sym->name, NULL) == FAILURE)
2720 /*FIXME:??? gfc_match_varspec does set this for us: */
2722 m = gfc_match_varspec (e, 0, false, true);
2726 /* See if this is a function reference with a keyword argument
2727 as first argument. We do this because otherwise a spurious
2728 symbol would end up in the symbol table. */
2730 old_loc = gfc_current_locus;
2731 m2 = gfc_match (" ( %n =", argname);
2732 gfc_current_locus = old_loc;
2734 e = gfc_get_expr ();
2735 e->symtree = symtree;
2737 if (m2 != MATCH_YES)
2739 /* Try to figure out whether we're dealing with a character type.
2740 We're peeking ahead here, because we don't want to call
2741 match_substring if we're dealing with an implicitly typed
2742 non-character variable. */
2743 implicit_char = false;
2744 if (sym->ts.type == BT_UNKNOWN)
2746 ts = gfc_get_default_type (sym->name, NULL);
2747 if (ts->type == BT_CHARACTER)
2748 implicit_char = true;
2751 /* See if this could possibly be a substring reference of a name
2752 that we're not sure is a variable yet. */
2754 if ((implicit_char || sym->ts.type == BT_CHARACTER)
2755 && match_substring (sym->ts.cl, 0, &e->ref) == MATCH_YES)
2758 e->expr_type = EXPR_VARIABLE;
2760 if (sym->attr.flavor != FL_VARIABLE
2761 && gfc_add_flavor (&sym->attr, FL_VARIABLE,
2762 sym->name, NULL) == FAILURE)
2768 if (sym->ts.type == BT_UNKNOWN
2769 && gfc_set_default_type (sym, 1, NULL) == FAILURE)
2783 /* Give up, assume we have a function. */
2785 gfc_get_sym_tree (name, NULL, &symtree); /* Can't fail */
2786 sym = symtree->n.sym;
2787 e->expr_type = EXPR_FUNCTION;
2789 if (!sym->attr.function
2790 && gfc_add_function (&sym->attr, sym->name, NULL) == FAILURE)
2798 m = gfc_match_actual_arglist (0, &e->value.function.actual);
2800 gfc_error ("Missing argument list in function '%s' at %C", sym->name);
2808 /* If our new function returns a character, array or structure
2809 type, it might have subsequent references. */
2811 m = gfc_match_varspec (e, 0, false, true);
2818 gfc_get_sym_tree (name, NULL, &symtree); /* Can't fail */
2820 e = gfc_get_expr ();
2821 e->symtree = symtree;
2822 e->expr_type = EXPR_FUNCTION;
2824 m = gfc_match_actual_arglist (0, &e->value.function.actual);
2828 gfc_error ("Symbol at %C is not appropriate for an expression");
2844 /* Match a variable, i.e. something that can be assigned to. This
2845 starts as a symbol, can be a structure component or an array
2846 reference. It can be a function if the function doesn't have a
2847 separate RESULT variable. If the symbol has not been previously
2848 seen, we assume it is a variable.
2850 This function is called by two interface functions:
2851 gfc_match_variable, which has host_flag = 1, and
2852 gfc_match_equiv_variable, with host_flag = 0, to restrict the
2853 match of the symbol to the local scope. */
2856 match_variable (gfc_expr **result, int equiv_flag, int host_flag)
2864 /* Since nothing has any business being an lvalue in a module
2865 specification block, an interface block or a contains section,
2866 we force the changed_symbols mechanism to work by setting
2867 host_flag to 0. This prevents valid symbols that have the name
2868 of keywords, such as 'end', being turned into variables by
2869 failed matching to assignments for, e.g., END INTERFACE. */
2870 if (gfc_current_state () == COMP_MODULE
2871 || gfc_current_state () == COMP_INTERFACE
2872 || gfc_current_state () == COMP_CONTAINS)
2875 where = gfc_current_locus;
2876 m = gfc_match_sym_tree (&st, host_flag);
2882 /* If this is an implicit do loop index and implicitly typed,
2883 it should not be host associated. */
2884 m = check_for_implicit_index (&st, &sym);
2888 sym->attr.implied_index = 0;
2890 gfc_set_sym_referenced (sym);
2891 switch (sym->attr.flavor)
2894 if (sym->attr.is_protected && sym->attr.use_assoc)
2896 gfc_error ("Assigning to PROTECTED variable at %C");
2903 sym_flavor flavor = FL_UNKNOWN;
2905 gfc_gobble_whitespace ();
2907 if (sym->attr.external || sym->attr.procedure
2908 || sym->attr.function || sym->attr.subroutine)
2909 flavor = FL_PROCEDURE;
2911 /* If it is not a procedure, is not typed and is host associated,
2912 we cannot give it a flavor yet. */
2913 else if (sym->ns == gfc_current_ns->parent
2914 && sym->ts.type == BT_UNKNOWN)
2917 /* These are definitive indicators that this is a variable. */
2918 else if (gfc_peek_ascii_char () != '(' || sym->ts.type != BT_UNKNOWN
2919 || sym->attr.pointer || sym->as != NULL)
2920 flavor = FL_VARIABLE;
2922 if (flavor != FL_UNKNOWN
2923 && gfc_add_flavor (&sym->attr, flavor, sym->name, NULL) == FAILURE)
2930 gfc_error ("Named constant at %C in an EQUIVALENCE");
2932 gfc_error ("Cannot assign to a named constant at %C");
2937 /* Check for a nonrecursive function result variable. */
2938 if (sym->attr.function
2939 && !sym->attr.external
2940 && sym->result == sym
2941 && ((sym == gfc_current_ns->proc_name
2942 && sym == gfc_current_ns->proc_name->result)
2943 || (gfc_current_ns->parent
2944 && sym == gfc_current_ns->parent->proc_name->result)
2946 && sym->ns == gfc_current_ns)
2948 && sym->ns == gfc_current_ns->parent)))
2950 /* If a function result is a derived type, then the derived
2951 type may still have to be resolved. */
2953 if (sym->ts.type == BT_DERIVED
2954 && gfc_use_derived (sym->ts.derived) == NULL)
2959 if (sym->attr.proc_pointer
2960 || replace_hidden_procptr_result (&sym, &st) == SUCCESS)
2963 /* Fall through to error */
2966 gfc_error ("'%s' at %C is not a variable", sym->name);
2970 /* Special case for derived type variables that get their types
2971 via an IMPLICIT statement. This can't wait for the
2972 resolution phase. */
2975 gfc_namespace * implicit_ns;
2977 if (gfc_current_ns->proc_name == sym)
2978 implicit_ns = gfc_current_ns;
2980 implicit_ns = sym->ns;
2982 if (gfc_peek_ascii_char () == '%'
2983 && sym->ts.type == BT_UNKNOWN
2984 && gfc_get_default_type (sym->name, implicit_ns)->type == BT_DERIVED)
2985 gfc_set_default_type (sym, 0, implicit_ns);
2988 expr = gfc_get_expr ();
2990 expr->expr_type = EXPR_VARIABLE;
2993 expr->where = where;
2995 /* Now see if we have to do more. */
2996 m = gfc_match_varspec (expr, equiv_flag, false, false);
2999 gfc_free_expr (expr);
3009 gfc_match_variable (gfc_expr **result, int equiv_flag)
3011 return match_variable (result, equiv_flag, 1);
3016 gfc_match_equiv_variable (gfc_expr **result)
3018 return match_variable (result, 1, 0);