1 /* Primary expression subroutines
2 Copyright (C) 2000, 2001, 2002, 2004, 2005, 2006, 2007, 2008, 2009, 2010
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/>. */
29 #include "constructor.h"
31 int matching_actual_arglist = 0;
33 /* Matches a kind-parameter expression, which is either a named
34 symbolic constant or a nonnegative integer constant. If
35 successful, sets the kind value to the correct integer. */
38 match_kind_param (int *kind)
40 char name[GFC_MAX_SYMBOL_LEN + 1];
45 m = gfc_match_small_literal_int (kind, NULL);
49 m = gfc_match_name (name);
53 if (gfc_find_symbol (name, NULL, 1, &sym))
59 if (sym->attr.flavor != FL_PARAMETER)
62 if (sym->value == NULL)
65 p = gfc_extract_int (sym->value, kind);
69 gfc_set_sym_referenced (sym);
78 /* Get a trailing kind-specification for non-character variables.
80 the integer kind value or:
81 -1 if an error was generated
82 -2 if no kind was found */
90 if (gfc_match_char ('_') != MATCH_YES)
93 m = match_kind_param (&kind);
95 gfc_error ("Missing kind-parameter at %C");
97 return (m == MATCH_YES) ? kind : -1;
101 /* Given a character and a radix, see if the character is a valid
102 digit in that radix. */
105 gfc_check_digit (char c, int radix)
112 r = ('0' <= c && c <= '1');
116 r = ('0' <= c && c <= '7');
120 r = ('0' <= c && c <= '9');
128 gfc_internal_error ("gfc_check_digit(): bad radix");
135 /* Match the digit string part of an integer if signflag is not set,
136 the signed digit string part if signflag is set. If the buffer
137 is NULL, we just count characters for the resolution pass. Returns
138 the number of characters matched, -1 for no match. */
141 match_digits (int signflag, int radix, char *buffer)
148 c = gfc_next_ascii_char ();
150 if (signflag && (c == '+' || c == '-'))
154 gfc_gobble_whitespace ();
155 c = gfc_next_ascii_char ();
159 if (!gfc_check_digit (c, radix))
168 old_loc = gfc_current_locus;
169 c = gfc_next_ascii_char ();
171 if (!gfc_check_digit (c, radix))
179 gfc_current_locus = old_loc;
185 /* Match an integer (digit string and optional kind).
186 A sign will be accepted if signflag is set. */
189 match_integer_constant (gfc_expr **result, int signflag)
196 old_loc = gfc_current_locus;
197 gfc_gobble_whitespace ();
199 length = match_digits (signflag, 10, NULL);
200 gfc_current_locus = old_loc;
204 buffer = (char *) alloca (length + 1);
205 memset (buffer, '\0', length + 1);
207 gfc_gobble_whitespace ();
209 match_digits (signflag, 10, buffer);
213 kind = gfc_default_integer_kind;
217 if (gfc_validate_kind (BT_INTEGER, kind, true) < 0)
219 gfc_error ("Integer kind %d at %C not available", kind);
223 e = gfc_convert_integer (buffer, kind, 10, &gfc_current_locus);
225 if (gfc_range_check (e) != ARITH_OK)
227 gfc_error ("Integer too big for its kind at %C. This check can be "
228 "disabled with the option -fno-range-check");
239 /* Match a Hollerith constant. */
242 match_hollerith_constant (gfc_expr **result)
250 old_loc = gfc_current_locus;
251 gfc_gobble_whitespace ();
253 if (match_integer_constant (&e, 0) == MATCH_YES
254 && gfc_match_char ('h') == MATCH_YES)
256 if (gfc_notify_std (GFC_STD_LEGACY, "Extension: Hollerith constant "
260 msg = gfc_extract_int (e, &num);
268 gfc_error ("Invalid Hollerith constant: %L must contain at least "
269 "one character", &old_loc);
272 if (e->ts.kind != gfc_default_integer_kind)
274 gfc_error ("Invalid Hollerith constant: Integer kind at %L "
275 "should be default", &old_loc);
281 e = gfc_get_constant_expr (BT_HOLLERITH, gfc_default_character_kind,
284 /* Calculate padding needed to fit default integer memory. */
285 pad = gfc_default_integer_kind - (num % gfc_default_integer_kind);
287 e->representation.string = XCNEWVEC (char, num + pad + 1);
289 for (i = 0; i < num; i++)
291 gfc_char_t c = gfc_next_char_literal (1);
292 if (! gfc_wide_fits_in_byte (c))
294 gfc_error ("Invalid Hollerith constant at %L contains a "
295 "wide character", &old_loc);
299 e->representation.string[i] = (unsigned char) c;
302 /* Now pad with blanks and end with a null char. */
303 for (i = 0; i < pad; i++)
304 e->representation.string[num + i] = ' ';
306 e->representation.string[num + i] = '\0';
307 e->representation.length = num + pad;
316 gfc_current_locus = old_loc;
325 /* Match a binary, octal or hexadecimal constant that can be found in
326 a DATA statement. The standard permits b'010...', o'73...', and
327 z'a1...' where b, o, and z can be capital letters. This function
328 also accepts postfixed forms of the constants: '01...'b, '73...'o,
329 and 'a1...'z. An additional extension is the use of x for z. */
332 match_boz_constant (gfc_expr **result)
334 int radix, length, x_hex, kind;
335 locus old_loc, start_loc;
336 char *buffer, post, delim;
339 start_loc = old_loc = gfc_current_locus;
340 gfc_gobble_whitespace ();
343 switch (post = gfc_next_ascii_char ())
365 radix = 16; /* Set to accept any valid digit string. */
371 /* No whitespace allowed here. */
374 delim = gfc_next_ascii_char ();
376 if (delim != '\'' && delim != '\"')
380 && (gfc_notify_std (GFC_STD_GNU, "Extension: Hexadecimal "
381 "constant at %C uses non-standard syntax")
385 old_loc = gfc_current_locus;
387 length = match_digits (0, radix, NULL);
390 gfc_error ("Empty set of digits in BOZ constant at %C");
394 if (gfc_next_ascii_char () != delim)
396 gfc_error ("Illegal character in BOZ constant at %C");
402 switch (gfc_next_ascii_char ())
419 if (gfc_notify_std (GFC_STD_GNU, "Extension: BOZ constant "
420 "at %C uses non-standard postfix syntax")
425 gfc_current_locus = old_loc;
427 buffer = (char *) alloca (length + 1);
428 memset (buffer, '\0', length + 1);
430 match_digits (0, radix, buffer);
431 gfc_next_ascii_char (); /* Eat delimiter. */
433 gfc_next_ascii_char (); /* Eat postfixed b, o, z, or x. */
435 /* In section 5.2.5 and following C567 in the Fortran 2003 standard, we find
436 "If a data-stmt-constant is a boz-literal-constant, the corresponding
437 variable shall be of type integer. The boz-literal-constant is treated
438 as if it were an int-literal-constant with a kind-param that specifies
439 the representation method with the largest decimal exponent range
440 supported by the processor." */
442 kind = gfc_max_integer_kind;
443 e = gfc_convert_integer (buffer, kind, radix, &gfc_current_locus);
445 /* Mark as boz variable. */
448 if (gfc_range_check (e) != ARITH_OK)
450 gfc_error ("Integer too big for integer kind %i at %C", kind);
455 if (!gfc_in_match_data ()
456 && (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: BOZ used outside a DATA "
465 gfc_current_locus = start_loc;
470 /* Match a real constant of some sort. Allow a signed constant if signflag
474 match_real_constant (gfc_expr **result, int signflag)
476 int kind, count, seen_dp, seen_digits;
477 locus old_loc, temp_loc;
478 char *p, *buffer, c, exp_char;
482 old_loc = gfc_current_locus;
483 gfc_gobble_whitespace ();
493 c = gfc_next_ascii_char ();
494 if (signflag && (c == '+' || c == '-'))
499 gfc_gobble_whitespace ();
500 c = gfc_next_ascii_char ();
503 /* Scan significand. */
504 for (;; c = gfc_next_ascii_char (), count++)
511 /* Check to see if "." goes with a following operator like
513 temp_loc = gfc_current_locus;
514 c = gfc_next_ascii_char ();
516 if (c == 'e' || c == 'd' || c == 'q')
518 c = gfc_next_ascii_char ();
520 goto done; /* Operator named .e. or .d. */
524 goto done; /* Distinguish 1.e9 from 1.eq.2 */
526 gfc_current_locus = temp_loc;
540 if (!seen_digits || (c != 'e' && c != 'd' && c != 'q'))
545 c = gfc_next_ascii_char ();
548 if (c == '+' || c == '-')
549 { /* optional sign */
550 c = gfc_next_ascii_char ();
556 gfc_error ("Missing exponent in real number at %C");
562 c = gfc_next_ascii_char ();
567 /* Check that we have a numeric constant. */
568 if (!seen_digits || (!seen_dp && exp_char == ' '))
570 gfc_current_locus = old_loc;
574 /* Convert the number. */
575 gfc_current_locus = old_loc;
576 gfc_gobble_whitespace ();
578 buffer = (char *) alloca (count + 1);
579 memset (buffer, '\0', count + 1);
582 c = gfc_next_ascii_char ();
583 if (c == '+' || c == '-')
585 gfc_gobble_whitespace ();
586 c = gfc_next_ascii_char ();
589 /* Hack for mpfr_set_str(). */
592 if (c == 'd' || c == 'q')
600 c = gfc_next_ascii_char ();
612 gfc_error ("Real number at %C has a 'd' exponent and an explicit "
616 kind = gfc_default_double_kind;
621 kind = gfc_default_real_kind;
623 if (gfc_validate_kind (BT_REAL, kind, true) < 0)
625 gfc_error ("Invalid real kind %d at %C", kind);
630 e = gfc_convert_real (buffer, kind, &gfc_current_locus);
632 mpfr_neg (e->value.real, e->value.real, GFC_RND_MODE);
634 switch (gfc_range_check (e))
639 gfc_error ("Real constant overflows its kind at %C");
642 case ARITH_UNDERFLOW:
643 if (gfc_option.warn_underflow)
644 gfc_warning ("Real constant underflows its kind at %C");
645 mpfr_set_ui (e->value.real, 0, GFC_RND_MODE);
649 gfc_internal_error ("gfc_range_check() returned bad value");
661 /* Match a substring reference. */
664 match_substring (gfc_charlen *cl, int init, gfc_ref **result)
666 gfc_expr *start, *end;
674 old_loc = gfc_current_locus;
676 m = gfc_match_char ('(');
680 if (gfc_match_char (':') != MATCH_YES)
683 m = gfc_match_init_expr (&start);
685 m = gfc_match_expr (&start);
693 m = gfc_match_char (':');
698 if (gfc_match_char (')') != MATCH_YES)
701 m = gfc_match_init_expr (&end);
703 m = gfc_match_expr (&end);
707 if (m == MATCH_ERROR)
710 m = gfc_match_char (')');
715 /* Optimize away the (:) reference. */
716 if (start == NULL && end == NULL)
720 ref = gfc_get_ref ();
722 ref->type = REF_SUBSTRING;
724 start = gfc_get_int_expr (gfc_default_integer_kind, NULL, 1);
725 ref->u.ss.start = start;
726 if (end == NULL && cl)
727 end = gfc_copy_expr (cl->length);
729 ref->u.ss.length = cl;
736 gfc_error ("Syntax error in SUBSTRING specification at %C");
740 gfc_free_expr (start);
743 gfc_current_locus = old_loc;
748 /* Reads the next character of a string constant, taking care to
749 return doubled delimiters on the input as a single instance of
752 Special return values for "ret" argument are:
753 -1 End of the string, as determined by the delimiter
754 -2 Unterminated string detected
756 Backslash codes are also expanded at this time. */
759 next_string_char (gfc_char_t delimiter, int *ret)
764 c = gfc_next_char_literal (1);
773 if (gfc_option.flag_backslash && c == '\\')
775 old_locus = gfc_current_locus;
777 if (gfc_match_special_char (&c) == MATCH_NO)
778 gfc_current_locus = old_locus;
780 if (!(gfc_option.allow_std & GFC_STD_GNU) && !inhibit_warnings)
781 gfc_warning ("Extension: backslash character at %C");
787 old_locus = gfc_current_locus;
788 c = gfc_next_char_literal (0);
792 gfc_current_locus = old_locus;
799 /* Special case of gfc_match_name() that matches a parameter kind name
800 before a string constant. This takes case of the weird but legal
805 where kind____ is a parameter. gfc_match_name() will happily slurp
806 up all the underscores, which leads to problems. If we return
807 MATCH_YES, the parse pointer points to the final underscore, which
808 is not part of the name. We never return MATCH_ERROR-- errors in
809 the name will be detected later. */
812 match_charkind_name (char *name)
818 gfc_gobble_whitespace ();
819 c = gfc_next_ascii_char ();
828 old_loc = gfc_current_locus;
829 c = gfc_next_ascii_char ();
833 peek = gfc_peek_ascii_char ();
835 if (peek == '\'' || peek == '\"')
837 gfc_current_locus = old_loc;
845 && (c != '$' || !gfc_option.flag_dollar_ok))
849 if (++len > GFC_MAX_SYMBOL_LEN)
857 /* See if the current input matches a character constant. Lots of
858 contortions have to be done to match the kind parameter which comes
859 before the actual string. The main consideration is that we don't
860 want to error out too quickly. For example, we don't actually do
861 any validation of the kinds until we have actually seen a legal
862 delimiter. Using match_kind_param() generates errors too quickly. */
865 match_string_constant (gfc_expr **result)
867 char name[GFC_MAX_SYMBOL_LEN + 1], peek;
868 int i, kind, length, warn_ampersand, ret;
869 locus old_locus, start_locus;
874 gfc_char_t c, delimiter, *p;
876 old_locus = gfc_current_locus;
878 gfc_gobble_whitespace ();
880 c = gfc_next_char ();
881 if (c == '\'' || c == '"')
883 kind = gfc_default_character_kind;
884 start_locus = gfc_current_locus;
888 if (gfc_wide_is_digit (c))
892 while (gfc_wide_is_digit (c))
894 kind = kind * 10 + c - '0';
897 c = gfc_next_char ();
903 gfc_current_locus = old_locus;
905 m = match_charkind_name (name);
909 if (gfc_find_symbol (name, NULL, 1, &sym)
911 || sym->attr.flavor != FL_PARAMETER)
915 c = gfc_next_char ();
920 gfc_gobble_whitespace ();
921 c = gfc_next_char ();
927 gfc_gobble_whitespace ();
929 c = gfc_next_char ();
930 if (c != '\'' && c != '"')
933 start_locus = gfc_current_locus;
937 q = gfc_extract_int (sym->value, &kind);
943 gfc_set_sym_referenced (sym);
946 if (gfc_validate_kind (BT_CHARACTER, kind, true) < 0)
948 gfc_error ("Invalid kind %d for CHARACTER constant at %C", kind);
953 /* Scan the string into a block of memory by first figuring out how
954 long it is, allocating the structure, then re-reading it. This
955 isn't particularly efficient, but string constants aren't that
956 common in most code. TODO: Use obstacks? */
963 c = next_string_char (delimiter, &ret);
968 gfc_current_locus = start_locus;
969 gfc_error ("Unterminated character constant beginning at %C");
976 /* Peek at the next character to see if it is a b, o, z, or x for the
977 postfixed BOZ literal constants. */
978 peek = gfc_peek_ascii_char ();
979 if (peek == 'b' || peek == 'o' || peek =='z' || peek == 'x')
982 e = gfc_get_character_expr (kind, &start_locus, NULL, length);
984 e->ts.is_c_interop = 0;
987 gfc_current_locus = start_locus;
989 /* We disable the warning for the following loop as the warning has already
990 been printed in the loop above. */
991 warn_ampersand = gfc_option.warn_ampersand;
992 gfc_option.warn_ampersand = 0;
994 p = e->value.character.string;
995 for (i = 0; i < length; i++)
997 c = next_string_char (delimiter, &ret);
999 if (!gfc_check_character_range (c, kind))
1001 gfc_error ("Character '%s' in string at %C is not representable "
1002 "in character kind %d", gfc_print_wide_char (c), kind);
1009 *p = '\0'; /* TODO: C-style string is for development/debug purposes. */
1010 gfc_option.warn_ampersand = warn_ampersand;
1012 next_string_char (delimiter, &ret);
1014 gfc_internal_error ("match_string_constant(): Delimiter not found");
1016 if (match_substring (NULL, 0, &e->ref) != MATCH_NO)
1017 e->expr_type = EXPR_SUBSTRING;
1024 gfc_current_locus = old_locus;
1029 /* Match a .true. or .false. Returns 1 if a .true. was found,
1030 0 if a .false. was found, and -1 otherwise. */
1032 match_logical_constant_string (void)
1034 locus orig_loc = gfc_current_locus;
1036 gfc_gobble_whitespace ();
1037 if (gfc_next_ascii_char () == '.')
1039 char ch = gfc_next_ascii_char ();
1042 if (gfc_next_ascii_char () == 'a'
1043 && gfc_next_ascii_char () == 'l'
1044 && gfc_next_ascii_char () == 's'
1045 && gfc_next_ascii_char () == 'e'
1046 && gfc_next_ascii_char () == '.')
1047 /* Matched ".false.". */
1052 if (gfc_next_ascii_char () == 'r'
1053 && gfc_next_ascii_char () == 'u'
1054 && gfc_next_ascii_char () == 'e'
1055 && gfc_next_ascii_char () == '.')
1056 /* Matched ".true.". */
1060 gfc_current_locus = orig_loc;
1064 /* Match a .true. or .false. */
1067 match_logical_constant (gfc_expr **result)
1072 i = match_logical_constant_string ();
1080 kind = gfc_default_logical_kind;
1082 if (gfc_validate_kind (BT_LOGICAL, kind, true) < 0)
1084 gfc_error ("Bad kind for logical constant at %C");
1088 e = gfc_get_logical_expr (kind, &gfc_current_locus, i);
1089 e->ts.is_c_interop = 0;
1097 /* Match a real or imaginary part of a complex constant that is a
1098 symbolic constant. */
1101 match_sym_complex_part (gfc_expr **result)
1103 char name[GFC_MAX_SYMBOL_LEN + 1];
1108 m = gfc_match_name (name);
1112 if (gfc_find_symbol (name, NULL, 1, &sym) || sym == NULL)
1115 if (sym->attr.flavor != FL_PARAMETER)
1117 gfc_error ("Expected PARAMETER symbol in complex constant at %C");
1121 if (!gfc_numeric_ts (&sym->value->ts))
1123 gfc_error ("Numeric PARAMETER required in complex constant at %C");
1127 if (sym->value->rank != 0)
1129 gfc_error ("Scalar PARAMETER required in complex constant at %C");
1133 if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: PARAMETER symbol in "
1134 "complex constant at %C") == FAILURE)
1137 switch (sym->value->ts.type)
1140 e = gfc_copy_expr (sym->value);
1144 e = gfc_complex2real (sym->value, sym->value->ts.kind);
1150 e = gfc_int2real (sym->value, gfc_default_real_kind);
1156 gfc_internal_error ("gfc_match_sym_complex_part(): Bad type");
1159 *result = e; /* e is a scalar, real, constant expression. */
1163 gfc_error ("Error converting PARAMETER constant in complex constant at %C");
1168 /* Match a real or imaginary part of a complex number. */
1171 match_complex_part (gfc_expr **result)
1175 m = match_sym_complex_part (result);
1179 m = match_real_constant (result, 1);
1183 return match_integer_constant (result, 1);
1187 /* Try to match a complex constant. */
1190 match_complex_constant (gfc_expr **result)
1192 gfc_expr *e, *real, *imag;
1193 gfc_error_buf old_error;
1194 gfc_typespec target;
1199 old_loc = gfc_current_locus;
1200 real = imag = e = NULL;
1202 m = gfc_match_char ('(');
1206 gfc_push_error (&old_error);
1208 m = match_complex_part (&real);
1211 gfc_free_error (&old_error);
1215 if (gfc_match_char (',') == MATCH_NO)
1217 gfc_pop_error (&old_error);
1222 /* If m is error, then something was wrong with the real part and we
1223 assume we have a complex constant because we've seen the ','. An
1224 ambiguous case here is the start of an iterator list of some
1225 sort. These sort of lists are matched prior to coming here. */
1227 if (m == MATCH_ERROR)
1229 gfc_free_error (&old_error);
1232 gfc_pop_error (&old_error);
1234 m = match_complex_part (&imag);
1237 if (m == MATCH_ERROR)
1240 m = gfc_match_char (')');
1243 /* Give the matcher for implied do-loops a chance to run. This
1244 yields a much saner error message for (/ (i, 4=i, 6) /). */
1245 if (gfc_peek_ascii_char () == '=')
1254 if (m == MATCH_ERROR)
1257 /* Decide on the kind of this complex number. */
1258 if (real->ts.type == BT_REAL)
1260 if (imag->ts.type == BT_REAL)
1261 kind = gfc_kind_max (real, imag);
1263 kind = real->ts.kind;
1267 if (imag->ts.type == BT_REAL)
1268 kind = imag->ts.kind;
1270 kind = gfc_default_real_kind;
1272 target.type = BT_REAL;
1274 target.is_c_interop = 0;
1275 target.is_iso_c = 0;
1277 if (real->ts.type != BT_REAL || kind != real->ts.kind)
1278 gfc_convert_type (real, &target, 2);
1279 if (imag->ts.type != BT_REAL || kind != imag->ts.kind)
1280 gfc_convert_type (imag, &target, 2);
1282 e = gfc_convert_complex (real, imag, kind);
1283 e->where = gfc_current_locus;
1285 gfc_free_expr (real);
1286 gfc_free_expr (imag);
1292 gfc_error ("Syntax error in COMPLEX constant at %C");
1297 gfc_free_expr (real);
1298 gfc_free_expr (imag);
1299 gfc_current_locus = old_loc;
1305 /* Match constants in any of several forms. Returns nonzero for a
1306 match, zero for no match. */
1309 gfc_match_literal_constant (gfc_expr **result, int signflag)
1313 m = match_complex_constant (result);
1317 m = match_string_constant (result);
1321 m = match_boz_constant (result);
1325 m = match_real_constant (result, signflag);
1329 m = match_hollerith_constant (result);
1333 m = match_integer_constant (result, signflag);
1337 m = match_logical_constant (result);
1345 /* This checks if a symbol is the return value of an encompassing function.
1346 Function nesting can be maximally two levels deep, but we may have
1347 additional local namespaces like BLOCK etc. */
1350 gfc_is_function_return_value (gfc_symbol *sym, gfc_namespace *ns)
1352 if (!sym->attr.function || (sym->result != sym))
1356 if (ns->proc_name == sym)
1364 /* Match a single actual argument value. An actual argument is
1365 usually an expression, but can also be a procedure name. If the
1366 argument is a single name, it is not always possible to tell
1367 whether the name is a dummy procedure or not. We treat these cases
1368 by creating an argument that looks like a dummy procedure and
1369 fixing things later during resolution. */
1372 match_actual_arg (gfc_expr **result)
1374 char name[GFC_MAX_SYMBOL_LEN + 1];
1375 gfc_symtree *symtree;
1380 gfc_gobble_whitespace ();
1381 where = gfc_current_locus;
1383 switch (gfc_match_name (name))
1392 w = gfc_current_locus;
1393 gfc_gobble_whitespace ();
1394 c = gfc_next_ascii_char ();
1395 gfc_current_locus = w;
1397 if (c != ',' && c != ')')
1400 if (gfc_find_sym_tree (name, NULL, 1, &symtree))
1402 /* Handle error elsewhere. */
1404 /* Eliminate a couple of common cases where we know we don't
1405 have a function argument. */
1406 if (symtree == NULL)
1408 gfc_get_sym_tree (name, NULL, &symtree, false);
1409 gfc_set_sym_referenced (symtree->n.sym);
1415 sym = symtree->n.sym;
1416 gfc_set_sym_referenced (sym);
1417 if (sym->attr.flavor != FL_PROCEDURE
1418 && sym->attr.flavor != FL_UNKNOWN)
1421 if (sym->attr.in_common && !sym->attr.proc_pointer)
1423 gfc_add_flavor (&sym->attr, FL_VARIABLE, sym->name,
1428 /* If the symbol is a function with itself as the result and
1429 is being defined, then we have a variable. */
1430 if (sym->attr.function && sym->result == sym)
1432 if (gfc_is_function_return_value (sym, gfc_current_ns))
1436 && (sym->ns == gfc_current_ns
1437 || sym->ns == gfc_current_ns->parent))
1439 gfc_entry_list *el = NULL;
1441 for (el = sym->ns->entries; el; el = el->next)
1451 e = gfc_get_expr (); /* Leave it unknown for now */
1452 e->symtree = symtree;
1453 e->expr_type = EXPR_VARIABLE;
1454 e->ts.type = BT_PROCEDURE;
1461 gfc_current_locus = where;
1462 return gfc_match_expr (result);
1466 /* Match a keyword argument. */
1469 match_keyword_arg (gfc_actual_arglist *actual, gfc_actual_arglist *base)
1471 char name[GFC_MAX_SYMBOL_LEN + 1];
1472 gfc_actual_arglist *a;
1476 name_locus = gfc_current_locus;
1477 m = gfc_match_name (name);
1481 if (gfc_match_char ('=') != MATCH_YES)
1487 m = match_actual_arg (&actual->expr);
1491 /* Make sure this name has not appeared yet. */
1493 if (name[0] != '\0')
1495 for (a = base; a; a = a->next)
1496 if (a->name != NULL && strcmp (a->name, name) == 0)
1498 gfc_error ("Keyword '%s' at %C has already appeared in the "
1499 "current argument list", name);
1504 actual->name = gfc_get_string (name);
1508 gfc_current_locus = name_locus;
1513 /* Match an argument list function, such as %VAL. */
1516 match_arg_list_function (gfc_actual_arglist *result)
1518 char name[GFC_MAX_SYMBOL_LEN + 1];
1522 old_locus = gfc_current_locus;
1524 if (gfc_match_char ('%') != MATCH_YES)
1530 m = gfc_match ("%n (", name);
1534 if (name[0] != '\0')
1539 if (strncmp (name, "loc", 3) == 0)
1541 result->name = "%LOC";
1545 if (strncmp (name, "ref", 3) == 0)
1547 result->name = "%REF";
1551 if (strncmp (name, "val", 3) == 0)
1553 result->name = "%VAL";
1562 if (gfc_notify_std (GFC_STD_GNU, "Extension: argument list "
1563 "function at %C") == FAILURE)
1569 m = match_actual_arg (&result->expr);
1573 if (gfc_match_char (')') != MATCH_YES)
1582 gfc_current_locus = old_locus;
1587 /* Matches an actual argument list of a function or subroutine, from
1588 the opening parenthesis to the closing parenthesis. The argument
1589 list is assumed to allow keyword arguments because we don't know if
1590 the symbol associated with the procedure has an implicit interface
1591 or not. We make sure keywords are unique. If sub_flag is set,
1592 we're matching the argument list of a subroutine. */
1595 gfc_match_actual_arglist (int sub_flag, gfc_actual_arglist **argp)
1597 gfc_actual_arglist *head, *tail;
1599 gfc_st_label *label;
1603 *argp = tail = NULL;
1604 old_loc = gfc_current_locus;
1608 if (gfc_match_char ('(') == MATCH_NO)
1609 return (sub_flag) ? MATCH_YES : MATCH_NO;
1611 if (gfc_match_char (')') == MATCH_YES)
1615 matching_actual_arglist++;
1620 head = tail = gfc_get_actual_arglist ();
1623 tail->next = gfc_get_actual_arglist ();
1627 if (sub_flag && gfc_match_char ('*') == MATCH_YES)
1629 m = gfc_match_st_label (&label);
1631 gfc_error ("Expected alternate return label at %C");
1635 tail->label = label;
1639 /* After the first keyword argument is seen, the following
1640 arguments must also have keywords. */
1643 m = match_keyword_arg (tail, head);
1645 if (m == MATCH_ERROR)
1649 gfc_error ("Missing keyword name in actual argument list at %C");
1656 /* Try an argument list function, like %VAL. */
1657 m = match_arg_list_function (tail);
1658 if (m == MATCH_ERROR)
1661 /* See if we have the first keyword argument. */
1664 m = match_keyword_arg (tail, head);
1667 if (m == MATCH_ERROR)
1673 /* Try for a non-keyword argument. */
1674 m = match_actual_arg (&tail->expr);
1675 if (m == MATCH_ERROR)
1684 if (gfc_match_char (')') == MATCH_YES)
1686 if (gfc_match_char (',') != MATCH_YES)
1691 matching_actual_arglist--;
1695 gfc_error ("Syntax error in argument list at %C");
1698 gfc_free_actual_arglist (head);
1699 gfc_current_locus = old_loc;
1700 matching_actual_arglist--;
1705 /* Used by gfc_match_varspec() to extend the reference list by one
1709 extend_ref (gfc_expr *primary, gfc_ref *tail)
1711 if (primary->ref == NULL)
1712 primary->ref = tail = gfc_get_ref ();
1716 gfc_internal_error ("extend_ref(): Bad tail");
1717 tail->next = gfc_get_ref ();
1725 /* Match any additional specifications associated with the current
1726 variable like member references or substrings. If equiv_flag is
1727 set we only match stuff that is allowed inside an EQUIVALENCE
1728 statement. sub_flag tells whether we expect a type-bound procedure found
1729 to be a subroutine as part of CALL or a FUNCTION. For procedure pointer
1730 components, 'ppc_arg' determines whether the PPC may be called (with an
1731 argument list), or whether it may just be referred to as a pointer. */
1734 gfc_match_varspec (gfc_expr *primary, int equiv_flag, bool sub_flag,
1737 char name[GFC_MAX_SYMBOL_LEN + 1];
1738 gfc_ref *substring, *tail;
1739 gfc_component *component;
1740 gfc_symbol *sym = primary->symtree->n.sym;
1746 gfc_gobble_whitespace ();
1748 if (gfc_peek_ascii_char () == '[')
1750 if (sym->attr.dimension)
1752 gfc_error ("Array section designator, e.g. '(:)', is required "
1753 "besides the coarray designator '[...]' at %C");
1756 if (!sym->attr.codimension)
1758 gfc_error ("Coarray designator at %C but '%s' is not a coarray",
1764 /* For associate names, we may not yet know whether they are arrays or not.
1765 Thus if we have one and parentheses follow, we have to assume that it
1766 actually is one for now. The final decision will be made at
1767 resolution time, of course. */
1768 if (sym->assoc && gfc_peek_ascii_char () == '(')
1769 sym->attr.dimension = 1;
1771 if ((equiv_flag && gfc_peek_ascii_char () == '(')
1772 || gfc_peek_ascii_char () == '[' || sym->attr.codimension
1773 || (sym->attr.dimension && !sym->attr.proc_pointer
1774 && !gfc_is_proc_ptr_comp (primary, NULL)
1775 && !(gfc_matching_procptr_assignment
1776 && sym->attr.flavor == FL_PROCEDURE))
1777 || (sym->ts.type == BT_CLASS && CLASS_DATA (sym)->attr.dimension))
1779 /* In EQUIVALENCE, we don't know yet whether we are seeing
1780 an array, character variable or array of character
1781 variables. We'll leave the decision till resolve time. */
1782 tail = extend_ref (primary, tail);
1783 tail->type = REF_ARRAY;
1785 m = gfc_match_array_ref (&tail->u.ar, equiv_flag ? NULL : sym->as,
1787 sym->ts.type == BT_CLASS
1788 ? (CLASS_DATA (sym)->as
1789 ? CLASS_DATA (sym)->as->corank : 0)
1790 : (sym->as ? sym->as->corank : 0));
1794 gfc_gobble_whitespace ();
1795 if (equiv_flag && gfc_peek_ascii_char () == '(')
1797 tail = extend_ref (primary, tail);
1798 tail->type = REF_ARRAY;
1800 m = gfc_match_array_ref (&tail->u.ar, NULL, equiv_flag, 0);
1806 primary->ts = sym->ts;
1811 if (sym->ts.type == BT_UNKNOWN && gfc_peek_ascii_char () == '%'
1812 && gfc_get_default_type (sym->name, sym->ns)->type == BT_DERIVED)
1813 gfc_set_default_type (sym, 0, sym->ns);
1815 if ((sym->ts.type != BT_DERIVED && sym->ts.type != BT_CLASS)
1816 || gfc_match_char ('%') != MATCH_YES)
1817 goto check_substring;
1819 sym = sym->ts.u.derived;
1826 m = gfc_match_name (name);
1828 gfc_error ("Expected structure component name at %C");
1832 if (sym->f2k_derived)
1833 tbp = gfc_find_typebound_proc (sym, &t, name, false, &gfc_current_locus);
1839 gfc_symbol* tbp_sym;
1844 gcc_assert (!tail || !tail->next);
1845 gcc_assert (primary->expr_type == EXPR_VARIABLE);
1847 if (tbp->n.tb->is_generic)
1850 tbp_sym = tbp->n.tb->u.specific->n.sym;
1852 primary->expr_type = EXPR_COMPCALL;
1853 primary->value.compcall.tbp = tbp->n.tb;
1854 primary->value.compcall.name = tbp->name;
1855 primary->value.compcall.ignore_pass = 0;
1856 primary->value.compcall.assign = 0;
1857 primary->value.compcall.base_object = NULL;
1858 gcc_assert (primary->symtree->n.sym->attr.referenced);
1860 primary->ts = tbp_sym->ts;
1862 m = gfc_match_actual_arglist (tbp->n.tb->subroutine,
1863 &primary->value.compcall.actual);
1864 if (m == MATCH_ERROR)
1869 primary->value.compcall.actual = NULL;
1872 gfc_error ("Expected argument list at %C");
1880 component = gfc_find_component (sym, name, false, false);
1881 if (component == NULL)
1884 tail = extend_ref (primary, tail);
1885 tail->type = REF_COMPONENT;
1887 tail->u.c.component = component;
1888 tail->u.c.sym = sym;
1890 primary->ts = component->ts;
1892 if (component->attr.proc_pointer && ppc_arg
1893 && !gfc_matching_procptr_assignment)
1895 /* Procedure pointer component call: Look for argument list. */
1896 m = gfc_match_actual_arglist (sub_flag,
1897 &primary->value.compcall.actual);
1898 if (m == MATCH_ERROR)
1901 if (m == MATCH_NO && !gfc_matching_ptr_assignment
1902 && !matching_actual_arglist)
1904 gfc_error ("Procedure pointer component '%s' requires an "
1905 "argument list at %C", component->name);
1910 primary->expr_type = EXPR_PPC;
1915 if (component->as != NULL && !component->attr.proc_pointer)
1917 tail = extend_ref (primary, tail);
1918 tail->type = REF_ARRAY;
1920 m = gfc_match_array_ref (&tail->u.ar, component->as, equiv_flag,
1921 component->as->corank);
1925 else if (component->ts.type == BT_CLASS
1926 && CLASS_DATA (component)->as != NULL
1927 && !component->attr.proc_pointer)
1929 tail = extend_ref (primary, tail);
1930 tail->type = REF_ARRAY;
1932 m = gfc_match_array_ref (&tail->u.ar, CLASS_DATA (component)->as,
1934 CLASS_DATA (component)->as->corank);
1939 if ((component->ts.type != BT_DERIVED && component->ts.type != BT_CLASS)
1940 || gfc_match_char ('%') != MATCH_YES)
1943 sym = component->ts.u.derived;
1948 if (primary->ts.type == BT_UNKNOWN && sym->attr.flavor != FL_DERIVED)
1950 if (gfc_get_default_type (sym->name, sym->ns)->type == BT_CHARACTER)
1952 gfc_set_default_type (sym, 0, sym->ns);
1953 primary->ts = sym->ts;
1958 if (primary->ts.type == BT_CHARACTER)
1960 switch (match_substring (primary->ts.u.cl, equiv_flag, &substring))
1964 primary->ref = substring;
1966 tail->next = substring;
1968 if (primary->expr_type == EXPR_CONSTANT)
1969 primary->expr_type = EXPR_SUBSTRING;
1972 primary->ts.u.cl = NULL;
1979 gfc_clear_ts (&primary->ts);
1980 gfc_clear_ts (&sym->ts);
1990 if (primary->expr_type == EXPR_PPC && gfc_is_coindexed (primary))
1992 gfc_error ("Coindexed procedure-pointer component at %C");
2000 /* Given an expression that is a variable, figure out what the
2001 ultimate variable's type and attribute is, traversing the reference
2002 structures if necessary.
2004 This subroutine is trickier than it looks. We start at the base
2005 symbol and store the attribute. Component references load a
2006 completely new attribute.
2008 A couple of rules come into play. Subobjects of targets are always
2009 targets themselves. If we see a component that goes through a
2010 pointer, then the expression must also be a target, since the
2011 pointer is associated with something (if it isn't core will soon be
2012 dumped). If we see a full part or section of an array, the
2013 expression is also an array.
2015 We can have at most one full array reference. */
2018 gfc_variable_attr (gfc_expr *expr, gfc_typespec *ts)
2020 int dimension, pointer, allocatable, target;
2021 symbol_attribute attr;
2024 gfc_component *comp;
2026 if (expr->expr_type != EXPR_VARIABLE && expr->expr_type != EXPR_FUNCTION)
2027 gfc_internal_error ("gfc_variable_attr(): Expression isn't a variable");
2029 sym = expr->symtree->n.sym;
2032 if (sym->ts.type == BT_CLASS)
2034 dimension = CLASS_DATA (sym)->attr.dimension;
2035 pointer = CLASS_DATA (sym)->attr.class_pointer;
2036 allocatable = CLASS_DATA (sym)->attr.allocatable;
2040 dimension = attr.dimension;
2041 pointer = attr.pointer;
2042 allocatable = attr.allocatable;
2045 target = attr.target;
2046 if (pointer || attr.proc_pointer)
2049 if (ts != NULL && expr->ts.type == BT_UNKNOWN)
2052 for (ref = expr->ref; ref; ref = ref->next)
2057 switch (ref->u.ar.type)
2064 allocatable = pointer = 0;
2069 /* Handle coarrays. */
2070 if (ref->u.ar.dimen > 0)
2071 allocatable = pointer = 0;
2075 gfc_internal_error ("gfc_variable_attr(): Bad array reference");
2081 comp = ref->u.c.component;
2086 /* Don't set the string length if a substring reference
2088 if (ts->type == BT_CHARACTER
2089 && ref->next && ref->next->type == REF_SUBSTRING)
2093 if (comp->ts.type == BT_CLASS)
2095 pointer = CLASS_DATA (comp)->attr.class_pointer;
2096 allocatable = CLASS_DATA (comp)->attr.allocatable;
2100 pointer = comp->attr.pointer;
2101 allocatable = comp->attr.allocatable;
2103 if (pointer || attr.proc_pointer)
2109 allocatable = pointer = 0;
2113 attr.dimension = dimension;
2114 attr.pointer = pointer;
2115 attr.allocatable = allocatable;
2116 attr.target = target;
2117 attr.save = sym->attr.save;
2123 /* Return the attribute from a general expression. */
2126 gfc_expr_attr (gfc_expr *e)
2128 symbol_attribute attr;
2130 switch (e->expr_type)
2133 attr = gfc_variable_attr (e, NULL);
2137 gfc_clear_attr (&attr);
2139 if (e->value.function.esym != NULL)
2141 gfc_symbol *sym = e->value.function.esym->result;
2143 if (sym->ts.type == BT_CLASS)
2145 attr.dimension = CLASS_DATA (sym)->attr.dimension;
2146 attr.pointer = CLASS_DATA (sym)->attr.class_pointer;
2147 attr.allocatable = CLASS_DATA (sym)->attr.allocatable;
2151 attr = gfc_variable_attr (e, NULL);
2153 /* TODO: NULL() returns pointers. May have to take care of this
2159 gfc_clear_attr (&attr);
2167 /* Match a structure constructor. The initial symbol has already been
2170 typedef struct gfc_structure_ctor_component
2175 struct gfc_structure_ctor_component* next;
2177 gfc_structure_ctor_component;
2179 #define gfc_get_structure_ctor_component() XCNEW (gfc_structure_ctor_component)
2182 gfc_free_structure_ctor_component (gfc_structure_ctor_component *comp)
2184 gfc_free (comp->name);
2185 gfc_free_expr (comp->val);
2190 /* Translate the component list into the actual constructor by sorting it in
2191 the order required; this also checks along the way that each and every
2192 component actually has an initializer and handles default initializers
2193 for components without explicit value given. */
2195 build_actual_constructor (gfc_structure_ctor_component **comp_head,
2196 gfc_constructor_base *ctor_head, gfc_symbol *sym)
2198 gfc_structure_ctor_component *comp_iter;
2199 gfc_component *comp;
2201 for (comp = sym->components; comp; comp = comp->next)
2203 gfc_structure_ctor_component **next_ptr;
2204 gfc_expr *value = NULL;
2206 /* Try to find the initializer for the current component by name. */
2207 next_ptr = comp_head;
2208 for (comp_iter = *comp_head; comp_iter; comp_iter = comp_iter->next)
2210 if (!strcmp (comp_iter->name, comp->name))
2212 next_ptr = &comp_iter->next;
2215 /* If an extension, try building the parent derived type by building
2216 a value expression for the parent derived type and calling self. */
2217 if (!comp_iter && comp == sym->components && sym->attr.extension)
2219 value = gfc_get_structure_constructor_expr (comp->ts.type,
2221 &gfc_current_locus);
2222 value->ts = comp->ts;
2224 if (build_actual_constructor (comp_head, &value->value.constructor,
2225 comp->ts.u.derived) == FAILURE)
2227 gfc_free_expr (value);
2231 gfc_constructor_append_expr (ctor_head, value, NULL);
2235 /* If it was not found, try the default initializer if there's any;
2236 otherwise, it's an error. */
2239 if (comp->initializer)
2241 if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: Structure"
2242 " constructor with missing optional arguments"
2243 " at %C") == FAILURE)
2245 value = gfc_copy_expr (comp->initializer);
2249 gfc_error ("No initializer for component '%s' given in the"
2250 " structure constructor at %C!", comp->name);
2255 value = comp_iter->val;
2257 /* Add the value to the constructor chain built. */
2258 gfc_constructor_append_expr (ctor_head, value, NULL);
2260 /* Remove the entry from the component list. We don't want the expression
2261 value to be free'd, so set it to NULL. */
2264 *next_ptr = comp_iter->next;
2265 comp_iter->val = NULL;
2266 gfc_free_structure_ctor_component (comp_iter);
2273 gfc_match_structure_constructor (gfc_symbol *sym, gfc_expr **result,
2276 gfc_structure_ctor_component *comp_tail, *comp_head, *comp_iter;
2277 gfc_constructor_base ctor_head = NULL;
2278 gfc_component *comp; /* Is set NULL when named component is first seen */
2282 const char* last_name = NULL;
2284 comp_tail = comp_head = NULL;
2286 if (!parent && gfc_match_char ('(') != MATCH_YES)
2289 where = gfc_current_locus;
2291 gfc_find_component (sym, NULL, false, true);
2293 /* Check that we're not about to construct an ABSTRACT type. */
2294 if (!parent && sym->attr.abstract)
2296 gfc_error ("Can't construct ABSTRACT type '%s' at %C", sym->name);
2300 /* Match the component list and store it in a list together with the
2301 corresponding component names. Check for empty argument list first. */
2302 if (gfc_match_char (')') != MATCH_YES)
2304 comp = sym->components;
2307 gfc_component *this_comp = NULL;
2310 comp_tail = comp_head = gfc_get_structure_ctor_component ();
2313 comp_tail->next = gfc_get_structure_ctor_component ();
2314 comp_tail = comp_tail->next;
2316 comp_tail->name = XCNEWVEC (char, GFC_MAX_SYMBOL_LEN + 1);
2317 comp_tail->val = NULL;
2318 comp_tail->where = gfc_current_locus;
2320 /* Try matching a component name. */
2321 if (gfc_match_name (comp_tail->name) == MATCH_YES
2322 && gfc_match_char ('=') == MATCH_YES)
2324 if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: Structure"
2325 " constructor with named arguments at %C")
2329 last_name = comp_tail->name;
2334 /* Components without name are not allowed after the first named
2335 component initializer! */
2339 gfc_error ("Component initializer without name after"
2340 " component named %s at %C!", last_name);
2342 gfc_error ("Too many components in structure constructor at"
2347 gfc_current_locus = comp_tail->where;
2348 strncpy (comp_tail->name, comp->name, GFC_MAX_SYMBOL_LEN + 1);
2351 /* Find the current component in the structure definition and check
2352 its access is not private. */
2354 this_comp = gfc_find_component (sym, comp->name, false, false);
2357 this_comp = gfc_find_component (sym,
2358 (const char *)comp_tail->name,
2360 comp = NULL; /* Reset needed! */
2363 /* Here we can check if a component name is given which does not
2364 correspond to any component of the defined structure. */
2368 /* Check if this component is already given a value. */
2369 for (comp_iter = comp_head; comp_iter != comp_tail;
2370 comp_iter = comp_iter->next)
2372 gcc_assert (comp_iter);
2373 if (!strcmp (comp_iter->name, comp_tail->name))
2375 gfc_error ("Component '%s' is initialized twice in the"
2376 " structure constructor at %C!", comp_tail->name);
2381 /* Match the current initializer expression. */
2382 m = gfc_match_expr (&comp_tail->val);
2385 if (m == MATCH_ERROR)
2388 /* F2008, R457/C725, for PURE C1283. */
2389 if (this_comp->attr.pointer && gfc_is_coindexed (comp_tail->val))
2391 gfc_error ("Coindexed expression to pointer component '%s' in "
2392 "structure constructor at %C!", comp_tail->name);
2397 /* If not explicitly a parent constructor, gather up the components
2399 if (comp && comp == sym->components
2400 && sym->attr.extension
2401 && (comp_tail->val->ts.type != BT_DERIVED
2403 comp_tail->val->ts.u.derived != this_comp->ts.u.derived))
2405 gfc_current_locus = where;
2406 gfc_free_expr (comp_tail->val);
2407 comp_tail->val = NULL;
2409 m = gfc_match_structure_constructor (comp->ts.u.derived,
2410 &comp_tail->val, true);
2413 if (m == MATCH_ERROR)
2420 if (parent && !comp)
2424 while (gfc_match_char (',') == MATCH_YES);
2426 if (!parent && gfc_match_char (')') != MATCH_YES)
2430 if (build_actual_constructor (&comp_head, &ctor_head, sym) == FAILURE)
2433 /* No component should be left, as this should have caused an error in the
2434 loop constructing the component-list (name that does not correspond to any
2435 component in the structure definition). */
2438 gcc_assert (sym->attr.extension);
2439 for (comp_iter = comp_head; comp_iter; comp_iter = comp_iter->next)
2441 gfc_error ("component '%s' at %L has already been set by a "
2442 "parent derived type constructor", comp_iter->name,
2448 e = gfc_get_structure_constructor_expr (BT_DERIVED, 0, &where);
2449 e->ts.u.derived = sym;
2450 e->value.constructor = ctor_head;
2456 gfc_error ("Syntax error in structure constructor at %C");
2459 for (comp_iter = comp_head; comp_iter; )
2461 gfc_structure_ctor_component *next = comp_iter->next;
2462 gfc_free_structure_ctor_component (comp_iter);
2465 gfc_constructor_free (ctor_head);
2470 /* If the symbol is an implicit do loop index and implicitly typed,
2471 it should not be host associated. Provide a symtree from the
2472 current namespace. */
2474 check_for_implicit_index (gfc_symtree **st, gfc_symbol **sym)
2476 if ((*sym)->attr.flavor == FL_VARIABLE
2477 && (*sym)->ns != gfc_current_ns
2478 && (*sym)->attr.implied_index
2479 && (*sym)->attr.implicit_type
2480 && !(*sym)->attr.use_assoc)
2483 i = gfc_get_sym_tree ((*sym)->name, NULL, st, false);
2486 *sym = (*st)->n.sym;
2492 /* Procedure pointer as function result: Replace the function symbol by the
2493 auto-generated hidden result variable named "ppr@". */
2496 replace_hidden_procptr_result (gfc_symbol **sym, gfc_symtree **st)
2498 /* Check for procedure pointer result variable. */
2499 if ((*sym)->attr.function && !(*sym)->attr.external
2500 && (*sym)->result && (*sym)->result != *sym
2501 && (*sym)->result->attr.proc_pointer
2502 && (*sym) == gfc_current_ns->proc_name
2503 && (*sym) == (*sym)->result->ns->proc_name
2504 && strcmp ("ppr@", (*sym)->result->name) == 0)
2506 /* Automatic replacement with "hidden" result variable. */
2507 (*sym)->result->attr.referenced = (*sym)->attr.referenced;
2508 *sym = (*sym)->result;
2509 *st = gfc_find_symtree ((*sym)->ns->sym_root, (*sym)->name);
2516 /* Matches a variable name followed by anything that might follow it--
2517 array reference, argument list of a function, etc. */
2520 gfc_match_rvalue (gfc_expr **result)
2522 gfc_actual_arglist *actual_arglist;
2523 char name[GFC_MAX_SYMBOL_LEN + 1], argname[GFC_MAX_SYMBOL_LEN + 1];
2526 gfc_symtree *symtree;
2527 locus where, old_loc;
2535 m = gfc_match_name (name);
2539 if (gfc_find_state (COMP_INTERFACE) == SUCCESS
2540 && !gfc_current_ns->has_import_set)
2541 i = gfc_get_sym_tree (name, NULL, &symtree, false);
2543 i = gfc_get_ha_sym_tree (name, &symtree);
2548 sym = symtree->n.sym;
2550 where = gfc_current_locus;
2552 replace_hidden_procptr_result (&sym, &symtree);
2554 /* If this is an implicit do loop index and implicitly typed,
2555 it should not be host associated. */
2556 m = check_for_implicit_index (&symtree, &sym);
2560 gfc_set_sym_referenced (sym);
2561 sym->attr.implied_index = 0;
2563 if (sym->attr.function && sym->result == sym)
2565 /* See if this is a directly recursive function call. */
2566 gfc_gobble_whitespace ();
2567 if (sym->attr.recursive
2568 && gfc_peek_ascii_char () == '('
2569 && gfc_current_ns->proc_name == sym
2570 && !sym->attr.dimension)
2572 gfc_error ("'%s' at %C is the name of a recursive function "
2573 "and so refers to the result variable. Use an "
2574 "explicit RESULT variable for direct recursion "
2575 "(12.5.2.1)", sym->name);
2579 if (gfc_is_function_return_value (sym, gfc_current_ns))
2583 && (sym->ns == gfc_current_ns
2584 || sym->ns == gfc_current_ns->parent))
2586 gfc_entry_list *el = NULL;
2588 for (el = sym->ns->entries; el; el = el->next)
2594 if (gfc_matching_procptr_assignment)
2597 if (sym->attr.function || sym->attr.external || sym->attr.intrinsic)
2600 if (sym->attr.generic)
2601 goto generic_function;
2603 switch (sym->attr.flavor)
2607 e = gfc_get_expr ();
2609 e->expr_type = EXPR_VARIABLE;
2610 e->symtree = symtree;
2612 m = gfc_match_varspec (e, 0, false, true);
2616 /* A statement of the form "REAL, parameter :: a(0:10) = 1" will
2617 end up here. Unfortunately, sym->value->expr_type is set to
2618 EXPR_CONSTANT, and so the if () branch would be followed without
2619 the !sym->as check. */
2620 if (sym->value && sym->value->expr_type != EXPR_ARRAY && !sym->as)
2621 e = gfc_copy_expr (sym->value);
2624 e = gfc_get_expr ();
2625 e->expr_type = EXPR_VARIABLE;
2628 e->symtree = symtree;
2629 m = gfc_match_varspec (e, 0, false, true);
2631 if (sym->ts.is_c_interop || sym->ts.is_iso_c)
2634 /* Variable array references to derived type parameters cause
2635 all sorts of headaches in simplification. Treating such
2636 expressions as variable works just fine for all array
2638 if (sym->value && sym->ts.type == BT_DERIVED && e->ref)
2640 for (ref = e->ref; ref; ref = ref->next)
2641 if (ref->type == REF_ARRAY)
2644 if (ref == NULL || ref->u.ar.type == AR_FULL)
2650 e = gfc_get_expr ();
2651 e->expr_type = EXPR_VARIABLE;
2652 e->symtree = symtree;
2659 sym = gfc_use_derived (sym);
2663 m = gfc_match_structure_constructor (sym, &e, false);
2666 /* If we're here, then the name is known to be the name of a
2667 procedure, yet it is not sure to be the name of a function. */
2670 /* Procedure Pointer Assignments. */
2672 if (gfc_matching_procptr_assignment)
2674 gfc_gobble_whitespace ();
2675 if (!sym->attr.dimension && gfc_peek_ascii_char () == '(')
2676 /* Parse functions returning a procptr. */
2679 if (gfc_is_intrinsic (sym, 0, gfc_current_locus)
2680 || gfc_is_intrinsic (sym, 1, gfc_current_locus))
2681 sym->attr.intrinsic = 1;
2682 e = gfc_get_expr ();
2683 e->expr_type = EXPR_VARIABLE;
2684 e->symtree = symtree;
2685 m = gfc_match_varspec (e, 0, false, true);
2689 if (sym->attr.subroutine)
2691 gfc_error ("Unexpected use of subroutine name '%s' at %C",
2697 /* At this point, the name has to be a non-statement function.
2698 If the name is the same as the current function being
2699 compiled, then we have a variable reference (to the function
2700 result) if the name is non-recursive. */
2702 st = gfc_enclosing_unit (NULL);
2704 if (st != NULL && st->state == COMP_FUNCTION
2706 && !sym->attr.recursive)
2708 e = gfc_get_expr ();
2709 e->symtree = symtree;
2710 e->expr_type = EXPR_VARIABLE;
2712 m = gfc_match_varspec (e, 0, false, true);
2716 /* Match a function reference. */
2718 m = gfc_match_actual_arglist (0, &actual_arglist);
2721 if (sym->attr.proc == PROC_ST_FUNCTION)
2722 gfc_error ("Statement function '%s' requires argument list at %C",
2725 gfc_error ("Function '%s' requires an argument list at %C",
2738 gfc_get_ha_sym_tree (name, &symtree); /* Can't fail */
2739 sym = symtree->n.sym;
2741 replace_hidden_procptr_result (&sym, &symtree);
2743 e = gfc_get_expr ();
2744 e->symtree = symtree;
2745 e->expr_type = EXPR_FUNCTION;
2746 e->value.function.actual = actual_arglist;
2747 e->where = gfc_current_locus;
2749 if (sym->as != NULL)
2750 e->rank = sym->as->rank;
2752 if (!sym->attr.function
2753 && gfc_add_function (&sym->attr, sym->name, NULL) == FAILURE)
2759 /* Check here for the existence of at least one argument for the
2760 iso_c_binding functions C_LOC, C_FUNLOC, and C_ASSOCIATED. The
2761 argument(s) given will be checked in gfc_iso_c_func_interface,
2762 during resolution of the function call. */
2763 if (sym->attr.is_iso_c == 1
2764 && (sym->from_intmod == INTMOD_ISO_C_BINDING
2765 && (sym->intmod_sym_id == ISOCBINDING_LOC
2766 || sym->intmod_sym_id == ISOCBINDING_FUNLOC
2767 || sym->intmod_sym_id == ISOCBINDING_ASSOCIATED)))
2769 /* make sure we were given a param */
2770 if (actual_arglist == NULL)
2772 gfc_error ("Missing argument to '%s' at %C", sym->name);
2778 if (sym->result == NULL)
2786 /* Special case for derived type variables that get their types
2787 via an IMPLICIT statement. This can't wait for the
2788 resolution phase. */
2790 if (gfc_peek_ascii_char () == '%'
2791 && sym->ts.type == BT_UNKNOWN
2792 && gfc_get_default_type (sym->name, sym->ns)->type == BT_DERIVED)
2793 gfc_set_default_type (sym, 0, sym->ns);
2795 /* If the symbol has a dimension attribute, the expression is a
2798 if (sym->attr.dimension)
2800 if (gfc_add_flavor (&sym->attr, FL_VARIABLE,
2801 sym->name, NULL) == FAILURE)
2807 e = gfc_get_expr ();
2808 e->symtree = symtree;
2809 e->expr_type = EXPR_VARIABLE;
2810 m = gfc_match_varspec (e, 0, false, true);
2814 /* Name is not an array, so we peek to see if a '(' implies a
2815 function call or a substring reference. Otherwise the
2816 variable is just a scalar. */
2818 gfc_gobble_whitespace ();
2819 if (gfc_peek_ascii_char () != '(')
2821 /* Assume a scalar variable */
2822 e = gfc_get_expr ();
2823 e->symtree = symtree;
2824 e->expr_type = EXPR_VARIABLE;
2826 if (gfc_add_flavor (&sym->attr, FL_VARIABLE,
2827 sym->name, NULL) == FAILURE)
2833 /*FIXME:??? gfc_match_varspec does set this for us: */
2835 m = gfc_match_varspec (e, 0, false, true);
2839 /* See if this is a function reference with a keyword argument
2840 as first argument. We do this because otherwise a spurious
2841 symbol would end up in the symbol table. */
2843 old_loc = gfc_current_locus;
2844 m2 = gfc_match (" ( %n =", argname);
2845 gfc_current_locus = old_loc;
2847 e = gfc_get_expr ();
2848 e->symtree = symtree;
2850 if (m2 != MATCH_YES)
2852 /* Try to figure out whether we're dealing with a character type.
2853 We're peeking ahead here, because we don't want to call
2854 match_substring if we're dealing with an implicitly typed
2855 non-character variable. */
2856 implicit_char = false;
2857 if (sym->ts.type == BT_UNKNOWN)
2859 ts = gfc_get_default_type (sym->name, NULL);
2860 if (ts->type == BT_CHARACTER)
2861 implicit_char = true;
2864 /* See if this could possibly be a substring reference of a name
2865 that we're not sure is a variable yet. */
2867 if ((implicit_char || sym->ts.type == BT_CHARACTER)
2868 && match_substring (sym->ts.u.cl, 0, &e->ref) == MATCH_YES)
2871 e->expr_type = EXPR_VARIABLE;
2873 if (sym->attr.flavor != FL_VARIABLE
2874 && gfc_add_flavor (&sym->attr, FL_VARIABLE,
2875 sym->name, NULL) == FAILURE)
2881 if (sym->ts.type == BT_UNKNOWN
2882 && gfc_set_default_type (sym, 1, NULL) == FAILURE)
2896 /* Give up, assume we have a function. */
2898 gfc_get_sym_tree (name, NULL, &symtree, false); /* Can't fail */
2899 sym = symtree->n.sym;
2900 e->expr_type = EXPR_FUNCTION;
2902 if (!sym->attr.function
2903 && gfc_add_function (&sym->attr, sym->name, NULL) == FAILURE)
2911 m = gfc_match_actual_arglist (0, &e->value.function.actual);
2913 gfc_error ("Missing argument list in function '%s' at %C", sym->name);
2921 /* If our new function returns a character, array or structure
2922 type, it might have subsequent references. */
2924 m = gfc_match_varspec (e, 0, false, true);
2931 gfc_get_sym_tree (name, NULL, &symtree, false); /* Can't fail */
2933 e = gfc_get_expr ();
2934 e->symtree = symtree;
2935 e->expr_type = EXPR_FUNCTION;
2937 m = gfc_match_actual_arglist (0, &e->value.function.actual);
2941 gfc_error ("Symbol at %C is not appropriate for an expression");
2957 /* Match a variable, i.e. something that can be assigned to. This
2958 starts as a symbol, can be a structure component or an array
2959 reference. It can be a function if the function doesn't have a
2960 separate RESULT variable. If the symbol has not been previously
2961 seen, we assume it is a variable.
2963 This function is called by two interface functions:
2964 gfc_match_variable, which has host_flag = 1, and
2965 gfc_match_equiv_variable, with host_flag = 0, to restrict the
2966 match of the symbol to the local scope. */
2969 match_variable (gfc_expr **result, int equiv_flag, int host_flag)
2977 /* Since nothing has any business being an lvalue in a module
2978 specification block, an interface block or a contains section,
2979 we force the changed_symbols mechanism to work by setting
2980 host_flag to 0. This prevents valid symbols that have the name
2981 of keywords, such as 'end', being turned into variables by
2982 failed matching to assignments for, e.g., END INTERFACE. */
2983 if (gfc_current_state () == COMP_MODULE
2984 || gfc_current_state () == COMP_INTERFACE
2985 || gfc_current_state () == COMP_CONTAINS)
2988 where = gfc_current_locus;
2989 m = gfc_match_sym_tree (&st, host_flag);
2995 /* If this is an implicit do loop index and implicitly typed,
2996 it should not be host associated. */
2997 m = check_for_implicit_index (&st, &sym);
3001 sym->attr.implied_index = 0;
3003 gfc_set_sym_referenced (sym);
3004 switch (sym->attr.flavor)
3007 /* Everything is alright. */
3012 sym_flavor flavor = FL_UNKNOWN;
3014 gfc_gobble_whitespace ();
3016 if (sym->attr.external || sym->attr.procedure
3017 || sym->attr.function || sym->attr.subroutine)
3018 flavor = FL_PROCEDURE;
3020 /* If it is not a procedure, is not typed and is host associated,
3021 we cannot give it a flavor yet. */
3022 else if (sym->ns == gfc_current_ns->parent
3023 && sym->ts.type == BT_UNKNOWN)
3026 /* These are definitive indicators that this is a variable. */
3027 else if (gfc_peek_ascii_char () != '(' || sym->ts.type != BT_UNKNOWN
3028 || sym->attr.pointer || sym->as != NULL)
3029 flavor = FL_VARIABLE;
3031 if (flavor != FL_UNKNOWN
3032 && gfc_add_flavor (&sym->attr, flavor, sym->name, NULL) == FAILURE)
3040 gfc_error ("Named constant at %C in an EQUIVALENCE");
3043 /* Otherwise this is checked for and an error given in the
3044 variable definition context checks. */
3048 /* Check for a nonrecursive function result variable. */
3049 if (sym->attr.function
3050 && !sym->attr.external
3051 && sym->result == sym
3052 && (gfc_is_function_return_value (sym, gfc_current_ns)
3054 && sym->ns == gfc_current_ns)
3056 && sym->ns == gfc_current_ns->parent)))
3058 /* If a function result is a derived type, then the derived
3059 type may still have to be resolved. */
3061 if (sym->ts.type == BT_DERIVED
3062 && gfc_use_derived (sym->ts.u.derived) == NULL)
3067 if (sym->attr.proc_pointer
3068 || replace_hidden_procptr_result (&sym, &st) == SUCCESS)
3071 /* Fall through to error */
3074 gfc_error ("'%s' at %C is not a variable", sym->name);
3078 /* Special case for derived type variables that get their types
3079 via an IMPLICIT statement. This can't wait for the
3080 resolution phase. */
3083 gfc_namespace * implicit_ns;
3085 if (gfc_current_ns->proc_name == sym)
3086 implicit_ns = gfc_current_ns;
3088 implicit_ns = sym->ns;
3090 if (gfc_peek_ascii_char () == '%'
3091 && sym->ts.type == BT_UNKNOWN
3092 && gfc_get_default_type (sym->name, implicit_ns)->type == BT_DERIVED)
3093 gfc_set_default_type (sym, 0, implicit_ns);
3096 expr = gfc_get_expr ();
3098 expr->expr_type = EXPR_VARIABLE;
3101 expr->where = where;
3103 /* Now see if we have to do more. */
3104 m = gfc_match_varspec (expr, equiv_flag, false, false);
3107 gfc_free_expr (expr);
3117 gfc_match_variable (gfc_expr **result, int equiv_flag)
3119 return match_variable (result, equiv_flag, 1);
3124 gfc_match_equiv_variable (gfc_expr **result)
3126 return match_variable (result, 1, 0);