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_UNKNOWN && gfc_peek_ascii_char () == '%'
1749 && gfc_get_default_type (sym, sym->ns)->type == BT_DERIVED)
1750 gfc_set_default_type (sym, 0, sym->ns);
1752 if (sym->ts.type != BT_DERIVED || gfc_match_char ('%') != MATCH_YES)
1753 goto check_substring;
1755 sym = sym->ts.derived;
1762 m = gfc_match_name (name);
1764 gfc_error ("Expected structure component name at %C");
1768 tbp = gfc_find_typebound_proc (sym, &t, name, false);
1771 gfc_symbol* tbp_sym;
1776 gcc_assert (!tail || !tail->next);
1777 gcc_assert (primary->expr_type == EXPR_VARIABLE);
1779 if (tbp->typebound->is_generic)
1782 tbp_sym = tbp->typebound->u.specific->n.sym;
1784 primary->expr_type = EXPR_COMPCALL;
1785 primary->value.compcall.tbp = tbp->typebound;
1786 primary->value.compcall.name = tbp->name;
1787 gcc_assert (primary->symtree->n.sym->attr.referenced);
1789 primary->ts = tbp_sym->ts;
1791 m = gfc_match_actual_arglist (tbp->typebound->subroutine,
1792 &primary->value.compcall.actual);
1793 if (m == MATCH_ERROR)
1798 primary->value.compcall.actual = NULL;
1801 gfc_error ("Expected argument list at %C");
1806 gfc_set_sym_referenced (tbp->n.sym);
1811 component = gfc_find_component (sym, name, false, false);
1812 if (component == NULL)
1815 tail = extend_ref (primary, tail);
1816 tail->type = REF_COMPONENT;
1818 tail->u.c.component = component;
1819 tail->u.c.sym = sym;
1821 primary->ts = component->ts;
1823 if (component->as != NULL)
1825 tail = extend_ref (primary, tail);
1826 tail->type = REF_ARRAY;
1828 m = gfc_match_array_ref (&tail->u.ar, component->as, equiv_flag);
1833 if (component->ts.type != BT_DERIVED
1834 || gfc_match_char ('%') != MATCH_YES)
1837 sym = component->ts.derived;
1842 if (primary->ts.type == BT_UNKNOWN)
1844 if (gfc_get_default_type (sym, sym->ns)->type == BT_CHARACTER)
1846 gfc_set_default_type (sym, 0, sym->ns);
1847 primary->ts = sym->ts;
1852 if (primary->ts.type == BT_CHARACTER)
1854 switch (match_substring (primary->ts.cl, equiv_flag, &substring))
1858 primary->ref = substring;
1860 tail->next = substring;
1862 if (primary->expr_type == EXPR_CONSTANT)
1863 primary->expr_type = EXPR_SUBSTRING;
1866 primary->ts.cl = NULL;
1873 gfc_clear_ts (&primary->ts);
1874 gfc_clear_ts (&sym->ts);
1887 /* Given an expression that is a variable, figure out what the
1888 ultimate variable's type and attribute is, traversing the reference
1889 structures if necessary.
1891 This subroutine is trickier than it looks. We start at the base
1892 symbol and store the attribute. Component references load a
1893 completely new attribute.
1895 A couple of rules come into play. Subobjects of targets are always
1896 targets themselves. If we see a component that goes through a
1897 pointer, then the expression must also be a target, since the
1898 pointer is associated with something (if it isn't core will soon be
1899 dumped). If we see a full part or section of an array, the
1900 expression is also an array.
1902 We can have at most one full array reference. */
1905 gfc_variable_attr (gfc_expr *expr, gfc_typespec *ts)
1907 int dimension, pointer, allocatable, target;
1908 symbol_attribute attr;
1911 if (expr->expr_type != EXPR_VARIABLE)
1912 gfc_internal_error ("gfc_variable_attr(): Expression isn't a variable");
1915 attr = expr->symtree->n.sym->attr;
1917 dimension = attr.dimension;
1918 pointer = attr.pointer;
1919 allocatable = attr.allocatable;
1921 target = attr.target;
1925 if (ts != NULL && expr->ts.type == BT_UNKNOWN)
1926 *ts = expr->symtree->n.sym->ts;
1928 for (; ref; ref = ref->next)
1933 switch (ref->u.ar.type)
1940 allocatable = pointer = 0;
1945 allocatable = pointer = 0;
1949 gfc_internal_error ("gfc_variable_attr(): Bad array reference");
1955 attr = ref->u.c.component->attr;
1958 *ts = ref->u.c.component->ts;
1959 /* Don't set the string length if a substring reference
1961 if (ts->type == BT_CHARACTER
1962 && ref->next && ref->next->type == REF_SUBSTRING)
1966 pointer = ref->u.c.component->attr.pointer;
1967 allocatable = ref->u.c.component->attr.allocatable;
1974 allocatable = pointer = 0;
1978 attr.dimension = dimension;
1979 attr.pointer = pointer;
1980 attr.allocatable = allocatable;
1981 attr.target = target;
1987 /* Return the attribute from a general expression. */
1990 gfc_expr_attr (gfc_expr *e)
1992 symbol_attribute attr;
1994 switch (e->expr_type)
1997 attr = gfc_variable_attr (e, NULL);
2001 gfc_clear_attr (&attr);
2003 if (e->value.function.esym != NULL)
2004 attr = e->value.function.esym->result->attr;
2006 /* TODO: NULL() returns pointers. May have to take care of this
2012 gfc_clear_attr (&attr);
2020 /* Match a structure constructor. The initial symbol has already been
2023 typedef struct gfc_structure_ctor_component
2028 struct gfc_structure_ctor_component* next;
2030 gfc_structure_ctor_component;
2032 #define gfc_get_structure_ctor_component() XCNEW (gfc_structure_ctor_component)
2035 gfc_free_structure_ctor_component (gfc_structure_ctor_component *comp)
2037 gfc_free (comp->name);
2038 gfc_free_expr (comp->val);
2042 /* Translate the component list into the actual constructor by sorting it in
2043 the order required; this also checks along the way that each and every
2044 component actually has an initializer and handles default initializers
2045 for components without explicit value given. */
2047 build_actual_constructor (gfc_structure_ctor_component **comp_head,
2048 gfc_constructor **ctor_head, gfc_symbol *sym)
2050 gfc_structure_ctor_component *comp_iter;
2051 gfc_constructor *ctor_tail = NULL;
2052 gfc_component *comp;
2054 for (comp = sym->components; comp; comp = comp->next)
2056 gfc_structure_ctor_component **next_ptr;
2057 gfc_expr *value = NULL;
2059 /* Try to find the initializer for the current component by name. */
2060 next_ptr = comp_head;
2061 for (comp_iter = *comp_head; comp_iter; comp_iter = comp_iter->next)
2063 if (!strcmp (comp_iter->name, comp->name))
2065 next_ptr = &comp_iter->next;
2068 /* If an extension, try building the parent derived type by building
2069 a value expression for the parent derived type and calling self. */
2070 if (!comp_iter && comp == sym->components && sym->attr.extension)
2072 value = gfc_get_expr ();
2073 value->expr_type = EXPR_STRUCTURE;
2074 value->value.constructor = NULL;
2075 value->ts = comp->ts;
2076 value->where = gfc_current_locus;
2078 if (build_actual_constructor (comp_head, &value->value.constructor,
2079 comp->ts.derived) == FAILURE)
2081 gfc_free_expr (value);
2084 *ctor_head = ctor_tail = gfc_get_constructor ();
2085 ctor_tail->expr = value;
2089 /* If it was not found, try the default initializer if there's any;
2090 otherwise, it's an error. */
2093 if (comp->initializer)
2095 if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: Structure"
2096 " constructor with missing optional arguments"
2097 " at %C") == FAILURE)
2099 value = gfc_copy_expr (comp->initializer);
2103 gfc_error ("No initializer for component '%s' given in the"
2104 " structure constructor at %C!", comp->name);
2109 value = comp_iter->val;
2111 /* Add the value to the constructor chain built. */
2114 ctor_tail->next = gfc_get_constructor ();
2115 ctor_tail = ctor_tail->next;
2118 *ctor_head = ctor_tail = gfc_get_constructor ();
2120 ctor_tail->expr = value;
2122 /* Remove the entry from the component list. We don't want the expression
2123 value to be free'd, so set it to NULL. */
2126 *next_ptr = comp_iter->next;
2127 comp_iter->val = NULL;
2128 gfc_free_structure_ctor_component (comp_iter);
2135 gfc_match_structure_constructor (gfc_symbol *sym, gfc_expr **result,
2138 gfc_structure_ctor_component *comp_tail, *comp_head, *comp_iter;
2139 gfc_constructor *ctor_head, *ctor_tail;
2140 gfc_component *comp; /* Is set NULL when named component is first seen */
2144 const char* last_name = NULL;
2146 comp_tail = comp_head = NULL;
2147 ctor_head = ctor_tail = NULL;
2149 if (!parent && gfc_match_char ('(') != MATCH_YES)
2152 where = gfc_current_locus;
2154 gfc_find_component (sym, NULL, false, true);
2156 /* Check that we're not about to construct an ABSTRACT type. */
2157 if (!parent && sym->attr.abstract)
2159 gfc_error ("Can't construct ABSTRACT type '%s' at %C", sym->name);
2163 /* Match the component list and store it in a list together with the
2164 corresponding component names. Check for empty argument list first. */
2165 if (gfc_match_char (')') != MATCH_YES)
2167 comp = sym->components;
2170 gfc_component *this_comp = NULL;
2173 comp_tail = comp_head = gfc_get_structure_ctor_component ();
2176 comp_tail->next = gfc_get_structure_ctor_component ();
2177 comp_tail = comp_tail->next;
2179 comp_tail->name = XCNEWVEC (char, GFC_MAX_SYMBOL_LEN + 1);
2180 comp_tail->val = NULL;
2181 comp_tail->where = gfc_current_locus;
2183 /* Try matching a component name. */
2184 if (gfc_match_name (comp_tail->name) == MATCH_YES
2185 && gfc_match_char ('=') == MATCH_YES)
2187 if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: Structure"
2188 " constructor with named arguments at %C")
2192 last_name = comp_tail->name;
2197 /* Components without name are not allowed after the first named
2198 component initializer! */
2202 gfc_error ("Component initializer without name after"
2203 " component named %s at %C!", last_name);
2205 gfc_error ("Too many components in structure constructor at"
2210 gfc_current_locus = comp_tail->where;
2211 strncpy (comp_tail->name, comp->name, GFC_MAX_SYMBOL_LEN + 1);
2214 /* Find the current component in the structure definition and check
2215 its access is not private. */
2217 this_comp = gfc_find_component (sym, comp->name, false, false);
2220 this_comp = gfc_find_component (sym,
2221 (const char *)comp_tail->name,
2223 comp = NULL; /* Reset needed! */
2226 /* Here we can check if a component name is given which does not
2227 correspond to any component of the defined structure. */
2231 /* Check if this component is already given a value. */
2232 for (comp_iter = comp_head; comp_iter != comp_tail;
2233 comp_iter = comp_iter->next)
2235 gcc_assert (comp_iter);
2236 if (!strcmp (comp_iter->name, comp_tail->name))
2238 gfc_error ("Component '%s' is initialized twice in the"
2239 " structure constructor at %C!", comp_tail->name);
2244 /* Match the current initializer expression. */
2245 m = gfc_match_expr (&comp_tail->val);
2248 if (m == MATCH_ERROR)
2251 /* If not explicitly a parent constructor, gather up the components
2253 if (comp && comp == sym->components
2254 && sym->attr.extension
2255 && (comp_tail->val->ts.type != BT_DERIVED
2257 comp_tail->val->ts.derived != this_comp->ts.derived))
2259 gfc_current_locus = where;
2260 gfc_free_expr (comp_tail->val);
2261 comp_tail->val = NULL;
2263 m = gfc_match_structure_constructor (comp->ts.derived,
2264 &comp_tail->val, true);
2267 if (m == MATCH_ERROR)
2274 if (parent && !comp)
2278 while (gfc_match_char (',') == MATCH_YES);
2280 if (!parent && gfc_match_char (')') != MATCH_YES)
2284 if (build_actual_constructor (&comp_head, &ctor_head, sym) == FAILURE)
2287 /* No component should be left, as this should have caused an error in the
2288 loop constructing the component-list (name that does not correspond to any
2289 component in the structure definition). */
2290 if (comp_head && sym->attr.extension)
2292 for (comp_iter = comp_head; comp_iter; comp_iter = comp_iter->next)
2294 gfc_error ("component '%s' at %L has already been set by a "
2295 "parent derived type constructor", comp_iter->name,
2301 gcc_assert (!comp_head);
2303 e = gfc_get_expr ();
2305 e->expr_type = EXPR_STRUCTURE;
2307 e->ts.type = BT_DERIVED;
2308 e->ts.derived = sym;
2311 e->value.constructor = ctor_head;
2317 gfc_error ("Syntax error in structure constructor at %C");
2320 for (comp_iter = comp_head; comp_iter; )
2322 gfc_structure_ctor_component *next = comp_iter->next;
2323 gfc_free_structure_ctor_component (comp_iter);
2326 gfc_free_constructor (ctor_head);
2331 /* If the symbol is an implicit do loop index and implicitly typed,
2332 it should not be host associated. Provide a symtree from the
2333 current namespace. */
2335 check_for_implicit_index (gfc_symtree **st, gfc_symbol **sym)
2337 if ((*sym)->attr.flavor == FL_VARIABLE
2338 && (*sym)->ns != gfc_current_ns
2339 && (*sym)->attr.implied_index
2340 && (*sym)->attr.implicit_type
2341 && !(*sym)->attr.use_assoc)
2344 i = gfc_get_sym_tree ((*sym)->name, NULL, st);
2347 *sym = (*st)->n.sym;
2353 /* Matches a variable name followed by anything that might follow it--
2354 array reference, argument list of a function, etc. */
2357 gfc_match_rvalue (gfc_expr **result)
2359 gfc_actual_arglist *actual_arglist;
2360 char name[GFC_MAX_SYMBOL_LEN + 1], argname[GFC_MAX_SYMBOL_LEN + 1];
2363 gfc_symtree *symtree;
2364 locus where, old_loc;
2372 m = gfc_match_name (name);
2376 if (gfc_find_state (COMP_INTERFACE) == SUCCESS
2377 && !gfc_current_ns->has_import_set)
2378 i = gfc_get_sym_tree (name, NULL, &symtree);
2380 i = gfc_get_ha_sym_tree (name, &symtree);
2385 sym = symtree->n.sym;
2387 where = gfc_current_locus;
2389 /* If this is an implicit do loop index and implicitly typed,
2390 it should not be host associated. */
2391 m = check_for_implicit_index (&symtree, &sym);
2395 gfc_set_sym_referenced (sym);
2396 sym->attr.implied_index = 0;
2398 if (sym->attr.function && sym->result == sym)
2400 /* See if this is a directly recursive function call. */
2401 gfc_gobble_whitespace ();
2402 if (sym->attr.recursive
2403 && gfc_peek_ascii_char () == '('
2404 && gfc_current_ns->proc_name == sym
2405 && !sym->attr.dimension)
2407 gfc_error ("'%s' at %C is the name of a recursive function "
2408 "and so refers to the result variable. Use an "
2409 "explicit RESULT variable for direct recursion "
2410 "(12.5.2.1)", sym->name);
2414 if (gfc_current_ns->proc_name == sym
2415 || (gfc_current_ns->parent != NULL
2416 && gfc_current_ns->parent->proc_name == sym))
2420 && (sym->ns == gfc_current_ns
2421 || sym->ns == gfc_current_ns->parent))
2423 gfc_entry_list *el = NULL;
2425 for (el = sym->ns->entries; el; el = el->next)
2431 if (gfc_matching_procptr_assignment)
2434 if (sym->attr.function || sym->attr.external || sym->attr.intrinsic)
2437 if (sym->attr.generic)
2438 goto generic_function;
2440 switch (sym->attr.flavor)
2444 e = gfc_get_expr ();
2446 e->expr_type = EXPR_VARIABLE;
2447 e->symtree = symtree;
2449 m = gfc_match_varspec (e, 0, false);
2453 /* A statement of the form "REAL, parameter :: a(0:10) = 1" will
2454 end up here. Unfortunately, sym->value->expr_type is set to
2455 EXPR_CONSTANT, and so the if () branch would be followed without
2456 the !sym->as check. */
2457 if (sym->value && sym->value->expr_type != EXPR_ARRAY && !sym->as)
2458 e = gfc_copy_expr (sym->value);
2461 e = gfc_get_expr ();
2462 e->expr_type = EXPR_VARIABLE;
2465 e->symtree = symtree;
2466 m = gfc_match_varspec (e, 0, false);
2468 if (sym->ts.is_c_interop || sym->ts.is_iso_c)
2471 /* Variable array references to derived type parameters cause
2472 all sorts of headaches in simplification. Treating such
2473 expressions as variable works just fine for all array
2475 if (sym->value && sym->ts.type == BT_DERIVED && e->ref)
2477 for (ref = e->ref; ref; ref = ref->next)
2478 if (ref->type == REF_ARRAY)
2481 if (ref == NULL || ref->u.ar.type == AR_FULL)
2487 e = gfc_get_expr ();
2488 e->expr_type = EXPR_VARIABLE;
2489 e->symtree = symtree;
2496 sym = gfc_use_derived (sym);
2500 m = gfc_match_structure_constructor (sym, &e, false);
2503 /* If we're here, then the name is known to be the name of a
2504 procedure, yet it is not sure to be the name of a function. */
2507 /* Procedure Pointer Assignments. */
2509 if (gfc_matching_procptr_assignment)
2511 gfc_gobble_whitespace ();
2512 if (gfc_peek_ascii_char () == '(')
2513 /* Parse functions returning a procptr. */
2516 if (gfc_is_intrinsic (sym, 0, gfc_current_locus)
2517 || gfc_is_intrinsic (sym, 1, gfc_current_locus))
2518 sym->attr.intrinsic = 1;
2519 e = gfc_get_expr ();
2520 e->expr_type = EXPR_VARIABLE;
2521 e->symtree = symtree;
2522 m = gfc_match_varspec (e, 0, false);
2526 if (sym->attr.subroutine)
2528 gfc_error ("Unexpected use of subroutine name '%s' at %C",
2534 /* At this point, the name has to be a non-statement function.
2535 If the name is the same as the current function being
2536 compiled, then we have a variable reference (to the function
2537 result) if the name is non-recursive. */
2539 st = gfc_enclosing_unit (NULL);
2541 if (st != NULL && st->state == COMP_FUNCTION
2543 && !sym->attr.recursive)
2545 e = gfc_get_expr ();
2546 e->symtree = symtree;
2547 e->expr_type = EXPR_VARIABLE;
2549 m = gfc_match_varspec (e, 0, false);
2553 /* Match a function reference. */
2555 m = gfc_match_actual_arglist (0, &actual_arglist);
2558 if (sym->attr.proc == PROC_ST_FUNCTION)
2559 gfc_error ("Statement function '%s' requires argument list at %C",
2562 gfc_error ("Function '%s' requires an argument list at %C",
2575 gfc_get_ha_sym_tree (name, &symtree); /* Can't fail */
2576 sym = symtree->n.sym;
2578 e = gfc_get_expr ();
2579 e->symtree = symtree;
2580 e->expr_type = EXPR_FUNCTION;
2581 e->value.function.actual = actual_arglist;
2582 e->where = gfc_current_locus;
2584 if (sym->as != NULL)
2585 e->rank = sym->as->rank;
2587 if (!sym->attr.function
2588 && gfc_add_function (&sym->attr, sym->name, NULL) == FAILURE)
2594 /* Check here for the existence of at least one argument for the
2595 iso_c_binding functions C_LOC, C_FUNLOC, and C_ASSOCIATED. The
2596 argument(s) given will be checked in gfc_iso_c_func_interface,
2597 during resolution of the function call. */
2598 if (sym->attr.is_iso_c == 1
2599 && (sym->from_intmod == INTMOD_ISO_C_BINDING
2600 && (sym->intmod_sym_id == ISOCBINDING_LOC
2601 || sym->intmod_sym_id == ISOCBINDING_FUNLOC
2602 || sym->intmod_sym_id == ISOCBINDING_ASSOCIATED)))
2604 /* make sure we were given a param */
2605 if (actual_arglist == NULL)
2607 gfc_error ("Missing argument to '%s' at %C", sym->name);
2613 if (sym->result == NULL)
2621 /* Special case for derived type variables that get their types
2622 via an IMPLICIT statement. This can't wait for the
2623 resolution phase. */
2625 if (gfc_peek_ascii_char () == '%'
2626 && sym->ts.type == BT_UNKNOWN
2627 && gfc_get_default_type (sym, sym->ns)->type == BT_DERIVED)
2628 gfc_set_default_type (sym, 0, sym->ns);
2630 /* If the symbol has a dimension attribute, the expression is a
2633 if (sym->attr.dimension)
2635 if (gfc_add_flavor (&sym->attr, FL_VARIABLE,
2636 sym->name, NULL) == FAILURE)
2642 e = gfc_get_expr ();
2643 e->symtree = symtree;
2644 e->expr_type = EXPR_VARIABLE;
2645 m = gfc_match_varspec (e, 0, false);
2649 /* Name is not an array, so we peek to see if a '(' implies a
2650 function call or a substring reference. Otherwise the
2651 variable is just a scalar. */
2653 gfc_gobble_whitespace ();
2654 if (gfc_peek_ascii_char () != '(')
2656 /* Assume a scalar variable */
2657 e = gfc_get_expr ();
2658 e->symtree = symtree;
2659 e->expr_type = EXPR_VARIABLE;
2661 if (gfc_add_flavor (&sym->attr, FL_VARIABLE,
2662 sym->name, NULL) == FAILURE)
2668 /*FIXME:??? gfc_match_varspec does set this for us: */
2670 m = gfc_match_varspec (e, 0, false);
2674 /* See if this is a function reference with a keyword argument
2675 as first argument. We do this because otherwise a spurious
2676 symbol would end up in the symbol table. */
2678 old_loc = gfc_current_locus;
2679 m2 = gfc_match (" ( %n =", argname);
2680 gfc_current_locus = old_loc;
2682 e = gfc_get_expr ();
2683 e->symtree = symtree;
2685 if (m2 != MATCH_YES)
2687 /* Try to figure out whether we're dealing with a character type.
2688 We're peeking ahead here, because we don't want to call
2689 match_substring if we're dealing with an implicitly typed
2690 non-character variable. */
2691 implicit_char = false;
2692 if (sym->ts.type == BT_UNKNOWN)
2694 ts = gfc_get_default_type (sym,NULL);
2695 if (ts->type == BT_CHARACTER)
2696 implicit_char = true;
2699 /* See if this could possibly be a substring reference of a name
2700 that we're not sure is a variable yet. */
2702 if ((implicit_char || sym->ts.type == BT_CHARACTER)
2703 && match_substring (sym->ts.cl, 0, &e->ref) == MATCH_YES)
2706 e->expr_type = EXPR_VARIABLE;
2708 if (sym->attr.flavor != FL_VARIABLE
2709 && gfc_add_flavor (&sym->attr, FL_VARIABLE,
2710 sym->name, NULL) == FAILURE)
2716 if (sym->ts.type == BT_UNKNOWN
2717 && gfc_set_default_type (sym, 1, NULL) == FAILURE)
2731 /* Give up, assume we have a function. */
2733 gfc_get_sym_tree (name, NULL, &symtree); /* Can't fail */
2734 sym = symtree->n.sym;
2735 e->expr_type = EXPR_FUNCTION;
2737 if (!sym->attr.function
2738 && gfc_add_function (&sym->attr, sym->name, NULL) == FAILURE)
2746 m = gfc_match_actual_arglist (0, &e->value.function.actual);
2748 gfc_error ("Missing argument list in function '%s' at %C", sym->name);
2756 /* If our new function returns a character, array or structure
2757 type, it might have subsequent references. */
2759 m = gfc_match_varspec (e, 0, false);
2766 gfc_get_sym_tree (name, NULL, &symtree); /* Can't fail */
2768 e = gfc_get_expr ();
2769 e->symtree = symtree;
2770 e->expr_type = EXPR_FUNCTION;
2772 m = gfc_match_actual_arglist (0, &e->value.function.actual);
2776 gfc_error ("Symbol at %C is not appropriate for an expression");
2792 /* Match a variable, i.e. something that can be assigned to. This
2793 starts as a symbol, can be a structure component or an array
2794 reference. It can be a function if the function doesn't have a
2795 separate RESULT variable. If the symbol has not been previously
2796 seen, we assume it is a variable.
2798 This function is called by two interface functions:
2799 gfc_match_variable, which has host_flag = 1, and
2800 gfc_match_equiv_variable, with host_flag = 0, to restrict the
2801 match of the symbol to the local scope. */
2804 match_variable (gfc_expr **result, int equiv_flag, int host_flag)
2812 /* Since nothing has any business being an lvalue in a module
2813 specification block, an interface block or a contains section,
2814 we force the changed_symbols mechanism to work by setting
2815 host_flag to 0. This prevents valid symbols that have the name
2816 of keywords, such as 'end', being turned into variables by
2817 failed matching to assignments for, e.g., END INTERFACE. */
2818 if (gfc_current_state () == COMP_MODULE
2819 || gfc_current_state () == COMP_INTERFACE
2820 || gfc_current_state () == COMP_CONTAINS)
2823 m = gfc_match_sym_tree (&st, host_flag);
2826 where = gfc_current_locus;
2830 /* If this is an implicit do loop index and implicitly typed,
2831 it should not be host associated. */
2832 m = check_for_implicit_index (&st, &sym);
2836 sym->attr.implied_index = 0;
2838 gfc_set_sym_referenced (sym);
2839 switch (sym->attr.flavor)
2842 if (sym->attr.is_protected && sym->attr.use_assoc)
2844 gfc_error ("Assigning to PROTECTED variable at %C");
2851 sym_flavor flavor = FL_UNKNOWN;
2853 gfc_gobble_whitespace ();
2855 if (sym->attr.external || sym->attr.procedure
2856 || sym->attr.function || sym->attr.subroutine)
2857 flavor = FL_PROCEDURE;
2859 /* If it is not a procedure, is not typed and is host associated,
2860 we cannot give it a flavor yet. */
2861 else if (sym->ns == gfc_current_ns->parent
2862 && sym->ts.type == BT_UNKNOWN)
2865 /* These are definitive indicators that this is a variable. */
2866 else if (gfc_peek_ascii_char () != '(' || sym->ts.type != BT_UNKNOWN
2867 || sym->attr.pointer || sym->as != NULL)
2868 flavor = FL_VARIABLE;
2870 if (flavor != FL_UNKNOWN
2871 && gfc_add_flavor (&sym->attr, flavor, sym->name, NULL) == FAILURE)
2878 gfc_error ("Named constant at %C in an EQUIVALENCE");
2880 gfc_error ("Cannot assign to a named constant at %C");
2885 /* Check for a nonrecursive function result variable. */
2886 if (sym->attr.function
2887 && !sym->attr.external
2888 && sym->result == sym
2889 && ((sym == gfc_current_ns->proc_name
2890 && sym == gfc_current_ns->proc_name->result)
2891 || (gfc_current_ns->parent
2892 && sym == gfc_current_ns->parent->proc_name->result)
2894 && sym->ns == gfc_current_ns)
2896 && sym->ns == gfc_current_ns->parent)))
2898 /* If a function result is a derived type, then the derived
2899 type may still have to be resolved. */
2901 if (sym->ts.type == BT_DERIVED
2902 && gfc_use_derived (sym->ts.derived) == NULL)
2907 if (sym->attr.proc_pointer)
2910 /* Fall through to error */
2913 gfc_error ("'%s' at %C is not a variable", sym->name);
2917 /* Special case for derived type variables that get their types
2918 via an IMPLICIT statement. This can't wait for the
2919 resolution phase. */
2922 gfc_namespace * implicit_ns;
2924 if (gfc_current_ns->proc_name == sym)
2925 implicit_ns = gfc_current_ns;
2927 implicit_ns = sym->ns;
2929 if (gfc_peek_ascii_char () == '%'
2930 && sym->ts.type == BT_UNKNOWN
2931 && gfc_get_default_type (sym, implicit_ns)->type == BT_DERIVED)
2932 gfc_set_default_type (sym, 0, implicit_ns);
2935 expr = gfc_get_expr ();
2937 expr->expr_type = EXPR_VARIABLE;
2940 expr->where = where;
2942 /* Now see if we have to do more. */
2943 m = gfc_match_varspec (expr, equiv_flag, false);
2946 gfc_free_expr (expr);
2956 gfc_match_variable (gfc_expr **result, int equiv_flag)
2958 return match_variable (result, equiv_flag, 1);
2963 gfc_match_equiv_variable (gfc_expr **result)
2965 return match_variable (result, 1, 0);