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,
1786 equiv_flag, sym->as ? sym->as->corank : 0);
1790 gfc_gobble_whitespace ();
1791 if (equiv_flag && gfc_peek_ascii_char () == '(')
1793 tail = extend_ref (primary, tail);
1794 tail->type = REF_ARRAY;
1796 m = gfc_match_array_ref (&tail->u.ar, NULL, equiv_flag, 0);
1802 primary->ts = sym->ts;
1807 if (sym->ts.type == BT_UNKNOWN && gfc_peek_ascii_char () == '%'
1808 && gfc_get_default_type (sym->name, sym->ns)->type == BT_DERIVED)
1809 gfc_set_default_type (sym, 0, sym->ns);
1811 if ((sym->ts.type != BT_DERIVED && sym->ts.type != BT_CLASS)
1812 || gfc_match_char ('%') != MATCH_YES)
1813 goto check_substring;
1815 sym = sym->ts.u.derived;
1822 m = gfc_match_name (name);
1824 gfc_error ("Expected structure component name at %C");
1828 if (sym->f2k_derived)
1829 tbp = gfc_find_typebound_proc (sym, &t, name, false, &gfc_current_locus);
1835 gfc_symbol* tbp_sym;
1840 gcc_assert (!tail || !tail->next);
1841 gcc_assert (primary->expr_type == EXPR_VARIABLE);
1843 if (tbp->n.tb->is_generic)
1846 tbp_sym = tbp->n.tb->u.specific->n.sym;
1848 primary->expr_type = EXPR_COMPCALL;
1849 primary->value.compcall.tbp = tbp->n.tb;
1850 primary->value.compcall.name = tbp->name;
1851 primary->value.compcall.ignore_pass = 0;
1852 primary->value.compcall.assign = 0;
1853 primary->value.compcall.base_object = NULL;
1854 gcc_assert (primary->symtree->n.sym->attr.referenced);
1856 primary->ts = tbp_sym->ts;
1858 m = gfc_match_actual_arglist (tbp->n.tb->subroutine,
1859 &primary->value.compcall.actual);
1860 if (m == MATCH_ERROR)
1865 primary->value.compcall.actual = NULL;
1868 gfc_error ("Expected argument list at %C");
1876 component = gfc_find_component (sym, name, false, false);
1877 if (component == NULL)
1880 tail = extend_ref (primary, tail);
1881 tail->type = REF_COMPONENT;
1883 tail->u.c.component = component;
1884 tail->u.c.sym = sym;
1886 primary->ts = component->ts;
1888 if (component->attr.proc_pointer && ppc_arg
1889 && !gfc_matching_procptr_assignment)
1891 /* Procedure pointer component call: Look for argument list. */
1892 m = gfc_match_actual_arglist (sub_flag,
1893 &primary->value.compcall.actual);
1894 if (m == MATCH_ERROR)
1897 if (m == MATCH_NO && !gfc_matching_ptr_assignment
1898 && !matching_actual_arglist)
1900 gfc_error ("Procedure pointer component '%s' requires an "
1901 "argument list at %C", component->name);
1906 primary->expr_type = EXPR_PPC;
1911 if (component->as != NULL && !component->attr.proc_pointer)
1913 tail = extend_ref (primary, tail);
1914 tail->type = REF_ARRAY;
1916 m = gfc_match_array_ref (&tail->u.ar, component->as, equiv_flag,
1917 component->as->corank);
1921 else if (component->ts.type == BT_CLASS
1922 && CLASS_DATA (component)->as != NULL
1923 && !component->attr.proc_pointer)
1925 tail = extend_ref (primary, tail);
1926 tail->type = REF_ARRAY;
1928 m = gfc_match_array_ref (&tail->u.ar, CLASS_DATA (component)->as,
1930 CLASS_DATA (component)->as->corank);
1935 if ((component->ts.type != BT_DERIVED && component->ts.type != BT_CLASS)
1936 || gfc_match_char ('%') != MATCH_YES)
1939 sym = component->ts.u.derived;
1944 if (primary->ts.type == BT_UNKNOWN && sym->attr.flavor != FL_DERIVED)
1946 if (gfc_get_default_type (sym->name, sym->ns)->type == BT_CHARACTER)
1948 gfc_set_default_type (sym, 0, sym->ns);
1949 primary->ts = sym->ts;
1954 if (primary->ts.type == BT_CHARACTER)
1956 switch (match_substring (primary->ts.u.cl, equiv_flag, &substring))
1960 primary->ref = substring;
1962 tail->next = substring;
1964 if (primary->expr_type == EXPR_CONSTANT)
1965 primary->expr_type = EXPR_SUBSTRING;
1968 primary->ts.u.cl = NULL;
1975 gfc_clear_ts (&primary->ts);
1976 gfc_clear_ts (&sym->ts);
1986 if (primary->expr_type == EXPR_PPC && gfc_is_coindexed (primary))
1988 gfc_error ("Coindexed procedure-pointer component at %C");
1996 /* Given an expression that is a variable, figure out what the
1997 ultimate variable's type and attribute is, traversing the reference
1998 structures if necessary.
2000 This subroutine is trickier than it looks. We start at the base
2001 symbol and store the attribute. Component references load a
2002 completely new attribute.
2004 A couple of rules come into play. Subobjects of targets are always
2005 targets themselves. If we see a component that goes through a
2006 pointer, then the expression must also be a target, since the
2007 pointer is associated with something (if it isn't core will soon be
2008 dumped). If we see a full part or section of an array, the
2009 expression is also an array.
2011 We can have at most one full array reference. */
2014 gfc_variable_attr (gfc_expr *expr, gfc_typespec *ts)
2016 int dimension, pointer, allocatable, target;
2017 symbol_attribute attr;
2020 gfc_component *comp;
2022 if (expr->expr_type != EXPR_VARIABLE && expr->expr_type != EXPR_FUNCTION)
2023 gfc_internal_error ("gfc_variable_attr(): Expression isn't a variable");
2025 sym = expr->symtree->n.sym;
2028 if (sym->ts.type == BT_CLASS)
2030 dimension = CLASS_DATA (sym)->attr.dimension;
2031 pointer = CLASS_DATA (sym)->attr.class_pointer;
2032 allocatable = CLASS_DATA (sym)->attr.allocatable;
2036 dimension = attr.dimension;
2037 pointer = attr.pointer;
2038 allocatable = attr.allocatable;
2041 target = attr.target;
2042 if (pointer || attr.proc_pointer)
2045 if (ts != NULL && expr->ts.type == BT_UNKNOWN)
2048 for (ref = expr->ref; ref; ref = ref->next)
2053 switch (ref->u.ar.type)
2060 allocatable = pointer = 0;
2065 /* Handle coarrays. */
2066 if (ref->u.ar.dimen > 0)
2067 allocatable = pointer = 0;
2071 gfc_internal_error ("gfc_variable_attr(): Bad array reference");
2077 comp = ref->u.c.component;
2082 /* Don't set the string length if a substring reference
2084 if (ts->type == BT_CHARACTER
2085 && ref->next && ref->next->type == REF_SUBSTRING)
2089 if (comp->ts.type == BT_CLASS)
2091 pointer = CLASS_DATA (comp)->attr.class_pointer;
2092 allocatable = CLASS_DATA (comp)->attr.allocatable;
2096 pointer = comp->attr.pointer;
2097 allocatable = comp->attr.allocatable;
2099 if (pointer || attr.proc_pointer)
2105 allocatable = pointer = 0;
2109 attr.dimension = dimension;
2110 attr.pointer = pointer;
2111 attr.allocatable = allocatable;
2112 attr.target = target;
2113 attr.save = sym->attr.save;
2119 /* Return the attribute from a general expression. */
2122 gfc_expr_attr (gfc_expr *e)
2124 symbol_attribute attr;
2126 switch (e->expr_type)
2129 attr = gfc_variable_attr (e, NULL);
2133 gfc_clear_attr (&attr);
2135 if (e->value.function.esym != NULL)
2137 gfc_symbol *sym = e->value.function.esym->result;
2139 if (sym->ts.type == BT_CLASS)
2141 attr.dimension = CLASS_DATA (sym)->attr.dimension;
2142 attr.pointer = CLASS_DATA (sym)->attr.class_pointer;
2143 attr.allocatable = CLASS_DATA (sym)->attr.allocatable;
2147 attr = gfc_variable_attr (e, NULL);
2149 /* TODO: NULL() returns pointers. May have to take care of this
2155 gfc_clear_attr (&attr);
2163 /* Match a structure constructor. The initial symbol has already been
2166 typedef struct gfc_structure_ctor_component
2171 struct gfc_structure_ctor_component* next;
2173 gfc_structure_ctor_component;
2175 #define gfc_get_structure_ctor_component() XCNEW (gfc_structure_ctor_component)
2178 gfc_free_structure_ctor_component (gfc_structure_ctor_component *comp)
2180 gfc_free (comp->name);
2181 gfc_free_expr (comp->val);
2186 /* Translate the component list into the actual constructor by sorting it in
2187 the order required; this also checks along the way that each and every
2188 component actually has an initializer and handles default initializers
2189 for components without explicit value given. */
2191 build_actual_constructor (gfc_structure_ctor_component **comp_head,
2192 gfc_constructor_base *ctor_head, gfc_symbol *sym)
2194 gfc_structure_ctor_component *comp_iter;
2195 gfc_component *comp;
2197 for (comp = sym->components; comp; comp = comp->next)
2199 gfc_structure_ctor_component **next_ptr;
2200 gfc_expr *value = NULL;
2202 /* Try to find the initializer for the current component by name. */
2203 next_ptr = comp_head;
2204 for (comp_iter = *comp_head; comp_iter; comp_iter = comp_iter->next)
2206 if (!strcmp (comp_iter->name, comp->name))
2208 next_ptr = &comp_iter->next;
2211 /* If an extension, try building the parent derived type by building
2212 a value expression for the parent derived type and calling self. */
2213 if (!comp_iter && comp == sym->components && sym->attr.extension)
2215 value = gfc_get_structure_constructor_expr (comp->ts.type,
2217 &gfc_current_locus);
2218 value->ts = comp->ts;
2220 if (build_actual_constructor (comp_head, &value->value.constructor,
2221 comp->ts.u.derived) == FAILURE)
2223 gfc_free_expr (value);
2227 gfc_constructor_append_expr (ctor_head, value, NULL);
2231 /* If it was not found, try the default initializer if there's any;
2232 otherwise, it's an error. */
2235 if (comp->initializer)
2237 if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: Structure"
2238 " constructor with missing optional arguments"
2239 " at %C") == FAILURE)
2241 value = gfc_copy_expr (comp->initializer);
2245 gfc_error ("No initializer for component '%s' given in the"
2246 " structure constructor at %C!", comp->name);
2251 value = comp_iter->val;
2253 /* Add the value to the constructor chain built. */
2254 gfc_constructor_append_expr (ctor_head, value, NULL);
2256 /* Remove the entry from the component list. We don't want the expression
2257 value to be free'd, so set it to NULL. */
2260 *next_ptr = comp_iter->next;
2261 comp_iter->val = NULL;
2262 gfc_free_structure_ctor_component (comp_iter);
2269 gfc_match_structure_constructor (gfc_symbol *sym, gfc_expr **result,
2272 gfc_structure_ctor_component *comp_tail, *comp_head, *comp_iter;
2273 gfc_constructor_base ctor_head = NULL;
2274 gfc_component *comp; /* Is set NULL when named component is first seen */
2278 const char* last_name = NULL;
2280 comp_tail = comp_head = NULL;
2282 if (!parent && gfc_match_char ('(') != MATCH_YES)
2285 where = gfc_current_locus;
2287 gfc_find_component (sym, NULL, false, true);
2289 /* Check that we're not about to construct an ABSTRACT type. */
2290 if (!parent && sym->attr.abstract)
2292 gfc_error ("Can't construct ABSTRACT type '%s' at %C", sym->name);
2296 /* Match the component list and store it in a list together with the
2297 corresponding component names. Check for empty argument list first. */
2298 if (gfc_match_char (')') != MATCH_YES)
2300 comp = sym->components;
2303 gfc_component *this_comp = NULL;
2306 comp_tail = comp_head = gfc_get_structure_ctor_component ();
2309 comp_tail->next = gfc_get_structure_ctor_component ();
2310 comp_tail = comp_tail->next;
2312 comp_tail->name = XCNEWVEC (char, GFC_MAX_SYMBOL_LEN + 1);
2313 comp_tail->val = NULL;
2314 comp_tail->where = gfc_current_locus;
2316 /* Try matching a component name. */
2317 if (gfc_match_name (comp_tail->name) == MATCH_YES
2318 && gfc_match_char ('=') == MATCH_YES)
2320 if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: Structure"
2321 " constructor with named arguments at %C")
2325 last_name = comp_tail->name;
2330 /* Components without name are not allowed after the first named
2331 component initializer! */
2335 gfc_error ("Component initializer without name after"
2336 " component named %s at %C!", last_name);
2338 gfc_error ("Too many components in structure constructor at"
2343 gfc_current_locus = comp_tail->where;
2344 strncpy (comp_tail->name, comp->name, GFC_MAX_SYMBOL_LEN + 1);
2347 /* Find the current component in the structure definition and check
2348 its access is not private. */
2350 this_comp = gfc_find_component (sym, comp->name, false, false);
2353 this_comp = gfc_find_component (sym,
2354 (const char *)comp_tail->name,
2356 comp = NULL; /* Reset needed! */
2359 /* Here we can check if a component name is given which does not
2360 correspond to any component of the defined structure. */
2364 /* Check if this component is already given a value. */
2365 for (comp_iter = comp_head; comp_iter != comp_tail;
2366 comp_iter = comp_iter->next)
2368 gcc_assert (comp_iter);
2369 if (!strcmp (comp_iter->name, comp_tail->name))
2371 gfc_error ("Component '%s' is initialized twice in the"
2372 " structure constructor at %C!", comp_tail->name);
2377 /* Match the current initializer expression. */
2378 m = gfc_match_expr (&comp_tail->val);
2381 if (m == MATCH_ERROR)
2384 /* F2008, R457/C725, for PURE C1283. */
2385 if (this_comp->attr.pointer && gfc_is_coindexed (comp_tail->val))
2387 gfc_error ("Coindexed expression to pointer component '%s' in "
2388 "structure constructor at %C!", comp_tail->name);
2393 /* If not explicitly a parent constructor, gather up the components
2395 if (comp && comp == sym->components
2396 && sym->attr.extension
2397 && (comp_tail->val->ts.type != BT_DERIVED
2399 comp_tail->val->ts.u.derived != this_comp->ts.u.derived))
2401 gfc_current_locus = where;
2402 gfc_free_expr (comp_tail->val);
2403 comp_tail->val = NULL;
2405 m = gfc_match_structure_constructor (comp->ts.u.derived,
2406 &comp_tail->val, true);
2409 if (m == MATCH_ERROR)
2416 if (parent && !comp)
2420 while (gfc_match_char (',') == MATCH_YES);
2422 if (!parent && gfc_match_char (')') != MATCH_YES)
2426 if (build_actual_constructor (&comp_head, &ctor_head, sym) == FAILURE)
2429 /* No component should be left, as this should have caused an error in the
2430 loop constructing the component-list (name that does not correspond to any
2431 component in the structure definition). */
2434 gcc_assert (sym->attr.extension);
2435 for (comp_iter = comp_head; comp_iter; comp_iter = comp_iter->next)
2437 gfc_error ("component '%s' at %L has already been set by a "
2438 "parent derived type constructor", comp_iter->name,
2444 e = gfc_get_structure_constructor_expr (BT_DERIVED, 0, &where);
2445 e->ts.u.derived = sym;
2446 e->value.constructor = ctor_head;
2452 gfc_error ("Syntax error in structure constructor at %C");
2455 for (comp_iter = comp_head; comp_iter; )
2457 gfc_structure_ctor_component *next = comp_iter->next;
2458 gfc_free_structure_ctor_component (comp_iter);
2461 gfc_constructor_free (ctor_head);
2466 /* If the symbol is an implicit do loop index and implicitly typed,
2467 it should not be host associated. Provide a symtree from the
2468 current namespace. */
2470 check_for_implicit_index (gfc_symtree **st, gfc_symbol **sym)
2472 if ((*sym)->attr.flavor == FL_VARIABLE
2473 && (*sym)->ns != gfc_current_ns
2474 && (*sym)->attr.implied_index
2475 && (*sym)->attr.implicit_type
2476 && !(*sym)->attr.use_assoc)
2479 i = gfc_get_sym_tree ((*sym)->name, NULL, st, false);
2482 *sym = (*st)->n.sym;
2488 /* Procedure pointer as function result: Replace the function symbol by the
2489 auto-generated hidden result variable named "ppr@". */
2492 replace_hidden_procptr_result (gfc_symbol **sym, gfc_symtree **st)
2494 /* Check for procedure pointer result variable. */
2495 if ((*sym)->attr.function && !(*sym)->attr.external
2496 && (*sym)->result && (*sym)->result != *sym
2497 && (*sym)->result->attr.proc_pointer
2498 && (*sym) == gfc_current_ns->proc_name
2499 && (*sym) == (*sym)->result->ns->proc_name
2500 && strcmp ("ppr@", (*sym)->result->name) == 0)
2502 /* Automatic replacement with "hidden" result variable. */
2503 (*sym)->result->attr.referenced = (*sym)->attr.referenced;
2504 *sym = (*sym)->result;
2505 *st = gfc_find_symtree ((*sym)->ns->sym_root, (*sym)->name);
2512 /* Matches a variable name followed by anything that might follow it--
2513 array reference, argument list of a function, etc. */
2516 gfc_match_rvalue (gfc_expr **result)
2518 gfc_actual_arglist *actual_arglist;
2519 char name[GFC_MAX_SYMBOL_LEN + 1], argname[GFC_MAX_SYMBOL_LEN + 1];
2522 gfc_symtree *symtree;
2523 locus where, old_loc;
2531 m = gfc_match_name (name);
2535 if (gfc_find_state (COMP_INTERFACE) == SUCCESS
2536 && !gfc_current_ns->has_import_set)
2537 i = gfc_get_sym_tree (name, NULL, &symtree, false);
2539 i = gfc_get_ha_sym_tree (name, &symtree);
2544 sym = symtree->n.sym;
2546 where = gfc_current_locus;
2548 replace_hidden_procptr_result (&sym, &symtree);
2550 /* If this is an implicit do loop index and implicitly typed,
2551 it should not be host associated. */
2552 m = check_for_implicit_index (&symtree, &sym);
2556 gfc_set_sym_referenced (sym);
2557 sym->attr.implied_index = 0;
2559 if (sym->attr.function && sym->result == sym)
2561 /* See if this is a directly recursive function call. */
2562 gfc_gobble_whitespace ();
2563 if (sym->attr.recursive
2564 && gfc_peek_ascii_char () == '('
2565 && gfc_current_ns->proc_name == sym
2566 && !sym->attr.dimension)
2568 gfc_error ("'%s' at %C is the name of a recursive function "
2569 "and so refers to the result variable. Use an "
2570 "explicit RESULT variable for direct recursion "
2571 "(12.5.2.1)", sym->name);
2575 if (gfc_is_function_return_value (sym, gfc_current_ns))
2579 && (sym->ns == gfc_current_ns
2580 || sym->ns == gfc_current_ns->parent))
2582 gfc_entry_list *el = NULL;
2584 for (el = sym->ns->entries; el; el = el->next)
2590 if (gfc_matching_procptr_assignment)
2593 if (sym->attr.function || sym->attr.external || sym->attr.intrinsic)
2596 if (sym->attr.generic)
2597 goto generic_function;
2599 switch (sym->attr.flavor)
2603 e = gfc_get_expr ();
2605 e->expr_type = EXPR_VARIABLE;
2606 e->symtree = symtree;
2608 m = gfc_match_varspec (e, 0, false, true);
2612 /* A statement of the form "REAL, parameter :: a(0:10) = 1" will
2613 end up here. Unfortunately, sym->value->expr_type is set to
2614 EXPR_CONSTANT, and so the if () branch would be followed without
2615 the !sym->as check. */
2616 if (sym->value && sym->value->expr_type != EXPR_ARRAY && !sym->as)
2617 e = gfc_copy_expr (sym->value);
2620 e = gfc_get_expr ();
2621 e->expr_type = EXPR_VARIABLE;
2624 e->symtree = symtree;
2625 m = gfc_match_varspec (e, 0, false, true);
2627 if (sym->ts.is_c_interop || sym->ts.is_iso_c)
2630 /* Variable array references to derived type parameters cause
2631 all sorts of headaches in simplification. Treating such
2632 expressions as variable works just fine for all array
2634 if (sym->value && sym->ts.type == BT_DERIVED && e->ref)
2636 for (ref = e->ref; ref; ref = ref->next)
2637 if (ref->type == REF_ARRAY)
2640 if (ref == NULL || ref->u.ar.type == AR_FULL)
2646 e = gfc_get_expr ();
2647 e->expr_type = EXPR_VARIABLE;
2648 e->symtree = symtree;
2655 sym = gfc_use_derived (sym);
2659 m = gfc_match_structure_constructor (sym, &e, false);
2662 /* If we're here, then the name is known to be the name of a
2663 procedure, yet it is not sure to be the name of a function. */
2666 /* Procedure Pointer Assignments. */
2668 if (gfc_matching_procptr_assignment)
2670 gfc_gobble_whitespace ();
2671 if (!sym->attr.dimension && gfc_peek_ascii_char () == '(')
2672 /* Parse functions returning a procptr. */
2675 if (gfc_is_intrinsic (sym, 0, gfc_current_locus)
2676 || gfc_is_intrinsic (sym, 1, gfc_current_locus))
2677 sym->attr.intrinsic = 1;
2678 e = gfc_get_expr ();
2679 e->expr_type = EXPR_VARIABLE;
2680 e->symtree = symtree;
2681 m = gfc_match_varspec (e, 0, false, true);
2685 if (sym->attr.subroutine)
2687 gfc_error ("Unexpected use of subroutine name '%s' at %C",
2693 /* At this point, the name has to be a non-statement function.
2694 If the name is the same as the current function being
2695 compiled, then we have a variable reference (to the function
2696 result) if the name is non-recursive. */
2698 st = gfc_enclosing_unit (NULL);
2700 if (st != NULL && st->state == COMP_FUNCTION
2702 && !sym->attr.recursive)
2704 e = gfc_get_expr ();
2705 e->symtree = symtree;
2706 e->expr_type = EXPR_VARIABLE;
2708 m = gfc_match_varspec (e, 0, false, true);
2712 /* Match a function reference. */
2714 m = gfc_match_actual_arglist (0, &actual_arglist);
2717 if (sym->attr.proc == PROC_ST_FUNCTION)
2718 gfc_error ("Statement function '%s' requires argument list at %C",
2721 gfc_error ("Function '%s' requires an argument list at %C",
2734 gfc_get_ha_sym_tree (name, &symtree); /* Can't fail */
2735 sym = symtree->n.sym;
2737 replace_hidden_procptr_result (&sym, &symtree);
2739 e = gfc_get_expr ();
2740 e->symtree = symtree;
2741 e->expr_type = EXPR_FUNCTION;
2742 e->value.function.actual = actual_arglist;
2743 e->where = gfc_current_locus;
2745 if (sym->as != NULL)
2746 e->rank = sym->as->rank;
2748 if (!sym->attr.function
2749 && gfc_add_function (&sym->attr, sym->name, NULL) == FAILURE)
2755 /* Check here for the existence of at least one argument for the
2756 iso_c_binding functions C_LOC, C_FUNLOC, and C_ASSOCIATED. The
2757 argument(s) given will be checked in gfc_iso_c_func_interface,
2758 during resolution of the function call. */
2759 if (sym->attr.is_iso_c == 1
2760 && (sym->from_intmod == INTMOD_ISO_C_BINDING
2761 && (sym->intmod_sym_id == ISOCBINDING_LOC
2762 || sym->intmod_sym_id == ISOCBINDING_FUNLOC
2763 || sym->intmod_sym_id == ISOCBINDING_ASSOCIATED)))
2765 /* make sure we were given a param */
2766 if (actual_arglist == NULL)
2768 gfc_error ("Missing argument to '%s' at %C", sym->name);
2774 if (sym->result == NULL)
2782 /* Special case for derived type variables that get their types
2783 via an IMPLICIT statement. This can't wait for the
2784 resolution phase. */
2786 if (gfc_peek_ascii_char () == '%'
2787 && sym->ts.type == BT_UNKNOWN
2788 && gfc_get_default_type (sym->name, sym->ns)->type == BT_DERIVED)
2789 gfc_set_default_type (sym, 0, sym->ns);
2791 /* If the symbol has a dimension attribute, the expression is a
2794 if (sym->attr.dimension)
2796 if (gfc_add_flavor (&sym->attr, FL_VARIABLE,
2797 sym->name, NULL) == FAILURE)
2803 e = gfc_get_expr ();
2804 e->symtree = symtree;
2805 e->expr_type = EXPR_VARIABLE;
2806 m = gfc_match_varspec (e, 0, false, true);
2810 /* Name is not an array, so we peek to see if a '(' implies a
2811 function call or a substring reference. Otherwise the
2812 variable is just a scalar. */
2814 gfc_gobble_whitespace ();
2815 if (gfc_peek_ascii_char () != '(')
2817 /* Assume a scalar variable */
2818 e = gfc_get_expr ();
2819 e->symtree = symtree;
2820 e->expr_type = EXPR_VARIABLE;
2822 if (gfc_add_flavor (&sym->attr, FL_VARIABLE,
2823 sym->name, NULL) == FAILURE)
2829 /*FIXME:??? gfc_match_varspec does set this for us: */
2831 m = gfc_match_varspec (e, 0, false, true);
2835 /* See if this is a function reference with a keyword argument
2836 as first argument. We do this because otherwise a spurious
2837 symbol would end up in the symbol table. */
2839 old_loc = gfc_current_locus;
2840 m2 = gfc_match (" ( %n =", argname);
2841 gfc_current_locus = old_loc;
2843 e = gfc_get_expr ();
2844 e->symtree = symtree;
2846 if (m2 != MATCH_YES)
2848 /* Try to figure out whether we're dealing with a character type.
2849 We're peeking ahead here, because we don't want to call
2850 match_substring if we're dealing with an implicitly typed
2851 non-character variable. */
2852 implicit_char = false;
2853 if (sym->ts.type == BT_UNKNOWN)
2855 ts = gfc_get_default_type (sym->name, NULL);
2856 if (ts->type == BT_CHARACTER)
2857 implicit_char = true;
2860 /* See if this could possibly be a substring reference of a name
2861 that we're not sure is a variable yet. */
2863 if ((implicit_char || sym->ts.type == BT_CHARACTER)
2864 && match_substring (sym->ts.u.cl, 0, &e->ref) == MATCH_YES)
2867 e->expr_type = EXPR_VARIABLE;
2869 if (sym->attr.flavor != FL_VARIABLE
2870 && gfc_add_flavor (&sym->attr, FL_VARIABLE,
2871 sym->name, NULL) == FAILURE)
2877 if (sym->ts.type == BT_UNKNOWN
2878 && gfc_set_default_type (sym, 1, NULL) == FAILURE)
2892 /* Give up, assume we have a function. */
2894 gfc_get_sym_tree (name, NULL, &symtree, false); /* Can't fail */
2895 sym = symtree->n.sym;
2896 e->expr_type = EXPR_FUNCTION;
2898 if (!sym->attr.function
2899 && gfc_add_function (&sym->attr, sym->name, NULL) == FAILURE)
2907 m = gfc_match_actual_arglist (0, &e->value.function.actual);
2909 gfc_error ("Missing argument list in function '%s' at %C", sym->name);
2917 /* If our new function returns a character, array or structure
2918 type, it might have subsequent references. */
2920 m = gfc_match_varspec (e, 0, false, true);
2927 gfc_get_sym_tree (name, NULL, &symtree, false); /* Can't fail */
2929 e = gfc_get_expr ();
2930 e->symtree = symtree;
2931 e->expr_type = EXPR_FUNCTION;
2933 m = gfc_match_actual_arglist (0, &e->value.function.actual);
2937 gfc_error ("Symbol at %C is not appropriate for an expression");
2953 /* Match a variable, i.e. something that can be assigned to. This
2954 starts as a symbol, can be a structure component or an array
2955 reference. It can be a function if the function doesn't have a
2956 separate RESULT variable. If the symbol has not been previously
2957 seen, we assume it is a variable.
2959 This function is called by two interface functions:
2960 gfc_match_variable, which has host_flag = 1, and
2961 gfc_match_equiv_variable, with host_flag = 0, to restrict the
2962 match of the symbol to the local scope. */
2965 match_variable (gfc_expr **result, int equiv_flag, int host_flag)
2973 /* Since nothing has any business being an lvalue in a module
2974 specification block, an interface block or a contains section,
2975 we force the changed_symbols mechanism to work by setting
2976 host_flag to 0. This prevents valid symbols that have the name
2977 of keywords, such as 'end', being turned into variables by
2978 failed matching to assignments for, e.g., END INTERFACE. */
2979 if (gfc_current_state () == COMP_MODULE
2980 || gfc_current_state () == COMP_INTERFACE
2981 || gfc_current_state () == COMP_CONTAINS)
2984 where = gfc_current_locus;
2985 m = gfc_match_sym_tree (&st, host_flag);
2991 /* If this is an implicit do loop index and implicitly typed,
2992 it should not be host associated. */
2993 m = check_for_implicit_index (&st, &sym);
2997 sym->attr.implied_index = 0;
2999 gfc_set_sym_referenced (sym);
3000 switch (sym->attr.flavor)
3003 /* Everything is alright. */
3008 sym_flavor flavor = FL_UNKNOWN;
3010 gfc_gobble_whitespace ();
3012 if (sym->attr.external || sym->attr.procedure
3013 || sym->attr.function || sym->attr.subroutine)
3014 flavor = FL_PROCEDURE;
3016 /* If it is not a procedure, is not typed and is host associated,
3017 we cannot give it a flavor yet. */
3018 else if (sym->ns == gfc_current_ns->parent
3019 && sym->ts.type == BT_UNKNOWN)
3022 /* These are definitive indicators that this is a variable. */
3023 else if (gfc_peek_ascii_char () != '(' || sym->ts.type != BT_UNKNOWN
3024 || sym->attr.pointer || sym->as != NULL)
3025 flavor = FL_VARIABLE;
3027 if (flavor != FL_UNKNOWN
3028 && gfc_add_flavor (&sym->attr, flavor, sym->name, NULL) == FAILURE)
3036 gfc_error ("Named constant at %C in an EQUIVALENCE");
3039 /* Otherwise this is checked for and an error given in the
3040 variable definition context checks. */
3044 /* Check for a nonrecursive function result variable. */
3045 if (sym->attr.function
3046 && !sym->attr.external
3047 && sym->result == sym
3048 && (gfc_is_function_return_value (sym, gfc_current_ns)
3050 && sym->ns == gfc_current_ns)
3052 && sym->ns == gfc_current_ns->parent)))
3054 /* If a function result is a derived type, then the derived
3055 type may still have to be resolved. */
3057 if (sym->ts.type == BT_DERIVED
3058 && gfc_use_derived (sym->ts.u.derived) == NULL)
3063 if (sym->attr.proc_pointer
3064 || replace_hidden_procptr_result (&sym, &st) == SUCCESS)
3067 /* Fall through to error */
3070 gfc_error ("'%s' at %C is not a variable", sym->name);
3074 /* Special case for derived type variables that get their types
3075 via an IMPLICIT statement. This can't wait for the
3076 resolution phase. */
3079 gfc_namespace * implicit_ns;
3081 if (gfc_current_ns->proc_name == sym)
3082 implicit_ns = gfc_current_ns;
3084 implicit_ns = sym->ns;
3086 if (gfc_peek_ascii_char () == '%'
3087 && sym->ts.type == BT_UNKNOWN
3088 && gfc_get_default_type (sym->name, implicit_ns)->type == BT_DERIVED)
3089 gfc_set_default_type (sym, 0, implicit_ns);
3092 expr = gfc_get_expr ();
3094 expr->expr_type = EXPR_VARIABLE;
3097 expr->where = where;
3099 /* Now see if we have to do more. */
3100 m = gfc_match_varspec (expr, equiv_flag, false, false);
3103 gfc_free_expr (expr);
3113 gfc_match_variable (gfc_expr **result, int equiv_flag)
3115 return match_variable (result, equiv_flag, 1);
3120 gfc_match_equiv_variable (gfc_expr **result)
3122 return match_variable (result, 1, 0);