1 /* Primary expression subroutines
2 Copyright (C) 2000, 2001, 2002, 2004, 2005, 2006, 2007, 2008
3 Free Software Foundation, Inc.
4 Contributed by Andy Vaught
6 This file is part of GCC.
8 GCC is free software; you can redistribute it and/or modify it under
9 the terms of the GNU General Public License as published by the Free
10 Software Foundation; either version 3, or (at your option) any later
13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
18 You should have received a copy of the GNU General Public License
19 along with GCC; see the file COPYING3. If not see
20 <http://www.gnu.org/licenses/>. */
31 /* Matches a kind-parameter expression, which is either a named
32 symbolic constant or a nonnegative integer constant. If
33 successful, sets the kind value to the correct integer. */
36 match_kind_param (int *kind
)
38 char name
[GFC_MAX_SYMBOL_LEN
+ 1];
43 m
= gfc_match_small_literal_int (kind
, NULL
);
47 m
= gfc_match_name (name
);
51 if (gfc_find_symbol (name
, NULL
, 1, &sym
))
57 if (sym
->attr
.flavor
!= FL_PARAMETER
)
60 p
= gfc_extract_int (sym
->value
, kind
);
64 gfc_set_sym_referenced (sym
);
73 /* Get a trailing kind-specification for non-character variables.
75 the integer kind value or:
76 -1 if an error was generated
77 -2 if no kind was found */
85 if (gfc_match_char ('_') != MATCH_YES
)
88 m
= match_kind_param (&kind
);
90 gfc_error ("Missing kind-parameter at %C");
92 return (m
== MATCH_YES
) ? kind
: -1;
96 /* Given a character and a radix, see if the character is a valid
97 digit in that radix. */
100 gfc_check_digit (char c
, int radix
)
107 r
= ('0' <= c
&& c
<= '1');
111 r
= ('0' <= c
&& c
<= '7');
115 r
= ('0' <= c
&& c
<= '9');
123 gfc_internal_error ("gfc_check_digit(): bad radix");
130 /* Match the digit string part of an integer if signflag is not set,
131 the signed digit string part if signflag is set. If the buffer
132 is NULL, we just count characters for the resolution pass. Returns
133 the number of characters matched, -1 for no match. */
136 match_digits (int signflag
, int radix
, char *buffer
)
143 c
= gfc_next_ascii_char ();
145 if (signflag
&& (c
== '+' || c
== '-'))
149 gfc_gobble_whitespace ();
150 c
= gfc_next_ascii_char ();
154 if (!gfc_check_digit (c
, radix
))
163 old_loc
= gfc_current_locus
;
164 c
= gfc_next_ascii_char ();
166 if (!gfc_check_digit (c
, radix
))
174 gfc_current_locus
= old_loc
;
180 /* Match an integer (digit string and optional kind).
181 A sign will be accepted if signflag is set. */
184 match_integer_constant (gfc_expr
**result
, int signflag
)
191 old_loc
= gfc_current_locus
;
192 gfc_gobble_whitespace ();
194 length
= match_digits (signflag
, 10, NULL
);
195 gfc_current_locus
= old_loc
;
199 buffer
= (char *) alloca (length
+ 1);
200 memset (buffer
, '\0', length
+ 1);
202 gfc_gobble_whitespace ();
204 match_digits (signflag
, 10, buffer
);
208 kind
= gfc_default_integer_kind
;
212 if (gfc_validate_kind (BT_INTEGER
, kind
, true) < 0)
214 gfc_error ("Integer kind %d at %C not available", kind
);
218 e
= gfc_convert_integer (buffer
, kind
, 10, &gfc_current_locus
);
220 if (gfc_range_check (e
) != ARITH_OK
)
222 gfc_error ("Integer too big for its kind at %C. This check can be "
223 "disabled with the option -fno-range-check");
234 /* Match a Hollerith constant. */
237 match_hollerith_constant (gfc_expr
**result
)
245 old_loc
= gfc_current_locus
;
246 gfc_gobble_whitespace ();
248 if (match_integer_constant (&e
, 0) == MATCH_YES
249 && gfc_match_char ('h') == MATCH_YES
)
251 if (gfc_notify_std (GFC_STD_LEGACY
, "Extension: Hollerith constant "
255 msg
= gfc_extract_int (e
, &num
);
263 gfc_error ("Invalid Hollerith constant: %L must contain at least "
264 "one character", &old_loc
);
267 if (e
->ts
.kind
!= gfc_default_integer_kind
)
269 gfc_error ("Invalid Hollerith constant: Integer kind at %L "
270 "should be default", &old_loc
);
276 e
= gfc_constant_result (BT_HOLLERITH
, gfc_default_character_kind
,
279 e
->representation
.string
= XCNEWVEC (char, num
+ 1);
281 for (i
= 0; i
< num
; i
++)
283 gfc_char_t c
= gfc_next_char_literal (1);
284 if (! gfc_wide_fits_in_byte (c
))
286 gfc_error ("Invalid Hollerith constant at %L contains a "
287 "wide character", &old_loc
);
291 e
->representation
.string
[i
] = (unsigned char) c
;
294 e
->representation
.string
[num
] = '\0';
295 e
->representation
.length
= num
;
303 gfc_current_locus
= old_loc
;
312 /* Match a binary, octal or hexadecimal constant that can be found in
313 a DATA statement. The standard permits b'010...', o'73...', and
314 z'a1...' where b, o, and z can be capital letters. This function
315 also accepts postfixed forms of the constants: '01...'b, '73...'o,
316 and 'a1...'z. An additional extension is the use of x for z. */
319 match_boz_constant (gfc_expr
**result
)
321 int radix
, length
, x_hex
, kind
;
322 locus old_loc
, start_loc
;
323 char *buffer
, post
, delim
;
326 start_loc
= old_loc
= gfc_current_locus
;
327 gfc_gobble_whitespace ();
330 switch (post
= gfc_next_ascii_char ())
352 radix
= 16; /* Set to accept any valid digit string. */
358 /* No whitespace allowed here. */
361 delim
= gfc_next_ascii_char ();
363 if (delim
!= '\'' && delim
!= '\"')
367 && (gfc_notify_std (GFC_STD_GNU
, "Extension: Hexadecimal "
368 "constant at %C uses non-standard syntax")
372 old_loc
= gfc_current_locus
;
374 length
= match_digits (0, radix
, NULL
);
377 gfc_error ("Empty set of digits in BOZ constant at %C");
381 if (gfc_next_ascii_char () != delim
)
383 gfc_error ("Illegal character in BOZ constant at %C");
389 switch (gfc_next_ascii_char ())
406 if (gfc_notify_std (GFC_STD_GNU
, "Extension: BOZ constant "
407 "at %C uses non-standard postfix syntax")
412 gfc_current_locus
= old_loc
;
414 buffer
= (char *) alloca (length
+ 1);
415 memset (buffer
, '\0', length
+ 1);
417 match_digits (0, radix
, buffer
);
418 gfc_next_ascii_char (); /* Eat delimiter. */
420 gfc_next_ascii_char (); /* Eat postfixed b, o, z, or x. */
422 /* In section 5.2.5 and following C567 in the Fortran 2003 standard, we find
423 "If a data-stmt-constant is a boz-literal-constant, the corresponding
424 variable shall be of type integer. The boz-literal-constant is treated
425 as if it were an int-literal-constant with a kind-param that specifies
426 the representation method with the largest decimal exponent range
427 supported by the processor." */
429 kind
= gfc_max_integer_kind
;
430 e
= gfc_convert_integer (buffer
, kind
, radix
, &gfc_current_locus
);
432 /* Mark as boz variable. */
435 if (gfc_range_check (e
) != ARITH_OK
)
437 gfc_error ("Integer too big for integer kind %i at %C", kind
);
442 if (!gfc_in_match_data ()
443 && (gfc_notify_std (GFC_STD_F2003
, "Fortran 2003: BOZ used outside a DATA "
452 gfc_current_locus
= start_loc
;
457 /* Match a real constant of some sort. Allow a signed constant if signflag
461 match_real_constant (gfc_expr
**result
, int signflag
)
463 int kind
, count
, seen_dp
, seen_digits
;
464 locus old_loc
, temp_loc
;
465 char *p
, *buffer
, c
, exp_char
;
469 old_loc
= gfc_current_locus
;
470 gfc_gobble_whitespace ();
480 c
= gfc_next_ascii_char ();
481 if (signflag
&& (c
== '+' || c
== '-'))
486 gfc_gobble_whitespace ();
487 c
= gfc_next_ascii_char ();
490 /* Scan significand. */
491 for (;; c
= gfc_next_ascii_char (), count
++)
498 /* Check to see if "." goes with a following operator like
500 temp_loc
= gfc_current_locus
;
501 c
= gfc_next_ascii_char ();
503 if (c
== 'e' || c
== 'd' || c
== 'q')
505 c
= gfc_next_ascii_char ();
507 goto done
; /* Operator named .e. or .d. */
511 goto done
; /* Distinguish 1.e9 from 1.eq.2 */
513 gfc_current_locus
= temp_loc
;
527 if (!seen_digits
|| (c
!= 'e' && c
!= 'd' && c
!= 'q'))
532 c
= gfc_next_ascii_char ();
535 if (c
== '+' || c
== '-')
536 { /* optional sign */
537 c
= gfc_next_ascii_char ();
543 gfc_error ("Missing exponent in real number at %C");
549 c
= gfc_next_ascii_char ();
554 /* Check that we have a numeric constant. */
555 if (!seen_digits
|| (!seen_dp
&& exp_char
== ' '))
557 gfc_current_locus
= old_loc
;
561 /* Convert the number. */
562 gfc_current_locus
= old_loc
;
563 gfc_gobble_whitespace ();
565 buffer
= (char *) alloca (count
+ 1);
566 memset (buffer
, '\0', count
+ 1);
569 c
= gfc_next_ascii_char ();
570 if (c
== '+' || c
== '-')
572 gfc_gobble_whitespace ();
573 c
= gfc_next_ascii_char ();
576 /* Hack for mpfr_set_str(). */
579 if (c
== 'd' || c
== 'q')
587 c
= gfc_next_ascii_char ();
599 gfc_error ("Real number at %C has a 'd' exponent and an explicit "
603 kind
= gfc_default_double_kind
;
608 kind
= gfc_default_real_kind
;
610 if (gfc_validate_kind (BT_REAL
, kind
, true) < 0)
612 gfc_error ("Invalid real kind %d at %C", kind
);
617 e
= gfc_convert_real (buffer
, kind
, &gfc_current_locus
);
619 mpfr_neg (e
->value
.real
, e
->value
.real
, GFC_RND_MODE
);
621 switch (gfc_range_check (e
))
626 gfc_error ("Real constant overflows its kind at %C");
629 case ARITH_UNDERFLOW
:
630 if (gfc_option
.warn_underflow
)
631 gfc_warning ("Real constant underflows its kind at %C");
632 mpfr_set_ui (e
->value
.real
, 0, GFC_RND_MODE
);
636 gfc_internal_error ("gfc_range_check() returned bad value");
648 /* Match a substring reference. */
651 match_substring (gfc_charlen
*cl
, int init
, gfc_ref
**result
)
653 gfc_expr
*start
, *end
;
661 old_loc
= gfc_current_locus
;
663 m
= gfc_match_char ('(');
667 if (gfc_match_char (':') != MATCH_YES
)
670 m
= gfc_match_init_expr (&start
);
672 m
= gfc_match_expr (&start
);
680 m
= gfc_match_char (':');
685 if (gfc_match_char (')') != MATCH_YES
)
688 m
= gfc_match_init_expr (&end
);
690 m
= gfc_match_expr (&end
);
694 if (m
== MATCH_ERROR
)
697 m
= gfc_match_char (')');
702 /* Optimize away the (:) reference. */
703 if (start
== NULL
&& end
== NULL
)
707 ref
= gfc_get_ref ();
709 ref
->type
= REF_SUBSTRING
;
711 start
= gfc_int_expr (1);
712 ref
->u
.ss
.start
= start
;
713 if (end
== NULL
&& cl
)
714 end
= gfc_copy_expr (cl
->length
);
716 ref
->u
.ss
.length
= cl
;
723 gfc_error ("Syntax error in SUBSTRING specification at %C");
727 gfc_free_expr (start
);
730 gfc_current_locus
= old_loc
;
735 /* Reads the next character of a string constant, taking care to
736 return doubled delimiters on the input as a single instance of
739 Special return values for "ret" argument are:
740 -1 End of the string, as determined by the delimiter
741 -2 Unterminated string detected
743 Backslash codes are also expanded at this time. */
746 next_string_char (gfc_char_t delimiter
, int *ret
)
751 c
= gfc_next_char_literal (1);
760 if (gfc_option
.flag_backslash
&& c
== '\\')
762 old_locus
= gfc_current_locus
;
764 if (gfc_match_special_char (&c
) == MATCH_NO
)
765 gfc_current_locus
= old_locus
;
767 if (!(gfc_option
.allow_std
& GFC_STD_GNU
) && !inhibit_warnings
)
768 gfc_warning ("Extension: backslash character at %C");
774 old_locus
= gfc_current_locus
;
775 c
= gfc_next_char_literal (0);
779 gfc_current_locus
= old_locus
;
786 /* Special case of gfc_match_name() that matches a parameter kind name
787 before a string constant. This takes case of the weird but legal
792 where kind____ is a parameter. gfc_match_name() will happily slurp
793 up all the underscores, which leads to problems. If we return
794 MATCH_YES, the parse pointer points to the final underscore, which
795 is not part of the name. We never return MATCH_ERROR-- errors in
796 the name will be detected later. */
799 match_charkind_name (char *name
)
805 gfc_gobble_whitespace ();
806 c
= gfc_next_ascii_char ();
815 old_loc
= gfc_current_locus
;
816 c
= gfc_next_ascii_char ();
820 peek
= gfc_peek_ascii_char ();
822 if (peek
== '\'' || peek
== '\"')
824 gfc_current_locus
= old_loc
;
832 && (gfc_option
.flag_dollar_ok
&& c
!= '$'))
836 if (++len
> GFC_MAX_SYMBOL_LEN
)
844 /* See if the current input matches a character constant. Lots of
845 contortions have to be done to match the kind parameter which comes
846 before the actual string. The main consideration is that we don't
847 want to error out too quickly. For example, we don't actually do
848 any validation of the kinds until we have actually seen a legal
849 delimiter. Using match_kind_param() generates errors too quickly. */
852 match_string_constant (gfc_expr
**result
)
854 char name
[GFC_MAX_SYMBOL_LEN
+ 1], peek
;
855 int i
, kind
, length
, warn_ampersand
, ret
;
856 locus old_locus
, start_locus
;
861 gfc_char_t c
, delimiter
, *p
;
863 old_locus
= gfc_current_locus
;
865 gfc_gobble_whitespace ();
867 start_locus
= gfc_current_locus
;
869 c
= gfc_next_char ();
870 if (c
== '\'' || c
== '"')
872 kind
= gfc_default_character_kind
;
876 if (gfc_wide_is_digit (c
))
880 while (gfc_wide_is_digit (c
))
882 kind
= kind
* 10 + c
- '0';
885 c
= gfc_next_char ();
891 gfc_current_locus
= old_locus
;
893 m
= match_charkind_name (name
);
897 if (gfc_find_symbol (name
, NULL
, 1, &sym
)
899 || sym
->attr
.flavor
!= FL_PARAMETER
)
903 c
= gfc_next_char ();
908 gfc_gobble_whitespace ();
909 c
= gfc_next_char ();
915 gfc_gobble_whitespace ();
916 start_locus
= gfc_current_locus
;
918 c
= gfc_next_char ();
919 if (c
!= '\'' && c
!= '"')
924 q
= gfc_extract_int (sym
->value
, &kind
);
930 gfc_set_sym_referenced (sym
);
933 if (gfc_validate_kind (BT_CHARACTER
, kind
, true) < 0)
935 gfc_error ("Invalid kind %d for CHARACTER constant at %C", kind
);
940 /* Scan the string into a block of memory by first figuring out how
941 long it is, allocating the structure, then re-reading it. This
942 isn't particularly efficient, but string constants aren't that
943 common in most code. TODO: Use obstacks? */
950 c
= next_string_char (delimiter
, &ret
);
955 gfc_current_locus
= start_locus
;
956 gfc_error ("Unterminated character constant beginning at %C");
963 /* Peek at the next character to see if it is a b, o, z, or x for the
964 postfixed BOZ literal constants. */
965 peek
= gfc_peek_ascii_char ();
966 if (peek
== 'b' || peek
== 'o' || peek
=='z' || peek
== 'x')
972 e
->expr_type
= EXPR_CONSTANT
;
974 e
->ts
.type
= BT_CHARACTER
;
976 e
->ts
.is_c_interop
= 0;
978 e
->where
= start_locus
;
980 e
->value
.character
.string
= p
= gfc_get_wide_string (length
+ 1);
981 e
->value
.character
.length
= length
;
983 gfc_current_locus
= start_locus
;
984 gfc_next_char (); /* Skip delimiter */
986 /* We disable the warning for the following loop as the warning has already
987 been printed in the loop above. */
988 warn_ampersand
= gfc_option
.warn_ampersand
;
989 gfc_option
.warn_ampersand
= 0;
991 for (i
= 0; i
< length
; i
++)
993 c
= next_string_char (delimiter
, &ret
);
995 if (!gfc_check_character_range (c
, kind
))
997 gfc_error ("Character '%s' in string at %C is not representable "
998 "in character kind %d", gfc_print_wide_char (c
), kind
);
1005 *p
= '\0'; /* TODO: C-style string is for development/debug purposes. */
1006 gfc_option
.warn_ampersand
= warn_ampersand
;
1008 next_string_char (delimiter
, &ret
);
1010 gfc_internal_error ("match_string_constant(): Delimiter not found");
1012 if (match_substring (NULL
, 0, &e
->ref
) != MATCH_NO
)
1013 e
->expr_type
= EXPR_SUBSTRING
;
1020 gfc_current_locus
= old_locus
;
1025 /* Match a .true. or .false. Returns 1 if a .true. was found,
1026 0 if a .false. was found, and -1 otherwise. */
1028 match_logical_constant_string (void)
1030 locus orig_loc
= gfc_current_locus
;
1032 gfc_gobble_whitespace ();
1033 if (gfc_next_ascii_char () == '.')
1035 char ch
= gfc_next_ascii_char ();
1038 if (gfc_next_ascii_char () == 'a'
1039 && gfc_next_ascii_char () == 'l'
1040 && gfc_next_ascii_char () == 's'
1041 && gfc_next_ascii_char () == 'e'
1042 && gfc_next_ascii_char () == '.')
1043 /* Matched ".false.". */
1048 if (gfc_next_ascii_char () == 'r'
1049 && gfc_next_ascii_char () == 'u'
1050 && gfc_next_ascii_char () == 'e'
1051 && gfc_next_ascii_char () == '.')
1052 /* Matched ".true.". */
1056 gfc_current_locus
= orig_loc
;
1060 /* Match a .true. or .false. */
1063 match_logical_constant (gfc_expr
**result
)
1068 i
= match_logical_constant_string ();
1076 kind
= gfc_default_logical_kind
;
1078 if (gfc_validate_kind (BT_LOGICAL
, kind
, true) < 0)
1080 gfc_error ("Bad kind for logical constant at %C");
1084 e
= gfc_get_expr ();
1086 e
->expr_type
= EXPR_CONSTANT
;
1087 e
->value
.logical
= i
;
1088 e
->ts
.type
= BT_LOGICAL
;
1090 e
->ts
.is_c_interop
= 0;
1092 e
->where
= gfc_current_locus
;
1099 /* Match a real or imaginary part of a complex constant that is a
1100 symbolic constant. */
1103 match_sym_complex_part (gfc_expr
**result
)
1105 char name
[GFC_MAX_SYMBOL_LEN
+ 1];
1110 m
= gfc_match_name (name
);
1114 if (gfc_find_symbol (name
, NULL
, 1, &sym
) || sym
== NULL
)
1117 if (sym
->attr
.flavor
!= FL_PARAMETER
)
1119 gfc_error ("Expected PARAMETER symbol in complex constant at %C");
1123 if (!gfc_numeric_ts (&sym
->value
->ts
))
1125 gfc_error ("Numeric PARAMETER required in complex constant at %C");
1129 if (sym
->value
->rank
!= 0)
1131 gfc_error ("Scalar PARAMETER required in complex constant at %C");
1135 if (gfc_notify_std (GFC_STD_F2003
, "Fortran 2003: PARAMETER symbol in "
1136 "complex constant at %C") == FAILURE
)
1139 switch (sym
->value
->ts
.type
)
1142 e
= gfc_copy_expr (sym
->value
);
1146 e
= gfc_complex2real (sym
->value
, sym
->value
->ts
.kind
);
1152 e
= gfc_int2real (sym
->value
, gfc_default_real_kind
);
1158 gfc_internal_error ("gfc_match_sym_complex_part(): Bad type");
1161 *result
= e
; /* e is a scalar, real, constant expression. */
1165 gfc_error ("Error converting PARAMETER constant in complex constant at %C");
1170 /* Match a real or imaginary part of a complex number. */
1173 match_complex_part (gfc_expr
**result
)
1177 m
= match_sym_complex_part (result
);
1181 m
= match_real_constant (result
, 1);
1185 return match_integer_constant (result
, 1);
1189 /* Try to match a complex constant. */
1192 match_complex_constant (gfc_expr
**result
)
1194 gfc_expr
*e
, *real
, *imag
;
1195 gfc_error_buf old_error
;
1196 gfc_typespec target
;
1201 old_loc
= gfc_current_locus
;
1202 real
= imag
= e
= NULL
;
1204 m
= gfc_match_char ('(');
1208 gfc_push_error (&old_error
);
1210 m
= match_complex_part (&real
);
1213 gfc_free_error (&old_error
);
1217 if (gfc_match_char (',') == MATCH_NO
)
1219 gfc_pop_error (&old_error
);
1224 /* If m is error, then something was wrong with the real part and we
1225 assume we have a complex constant because we've seen the ','. An
1226 ambiguous case here is the start of an iterator list of some
1227 sort. These sort of lists are matched prior to coming here. */
1229 if (m
== MATCH_ERROR
)
1231 gfc_free_error (&old_error
);
1234 gfc_pop_error (&old_error
);
1236 m
= match_complex_part (&imag
);
1239 if (m
== MATCH_ERROR
)
1242 m
= gfc_match_char (')');
1245 /* Give the matcher for implied do-loops a chance to run. This
1246 yields a much saner error message for (/ (i, 4=i, 6) /). */
1247 if (gfc_peek_ascii_char () == '=')
1256 if (m
== MATCH_ERROR
)
1259 /* Decide on the kind of this complex number. */
1260 if (real
->ts
.type
== BT_REAL
)
1262 if (imag
->ts
.type
== BT_REAL
)
1263 kind
= gfc_kind_max (real
, imag
);
1265 kind
= real
->ts
.kind
;
1269 if (imag
->ts
.type
== BT_REAL
)
1270 kind
= imag
->ts
.kind
;
1272 kind
= gfc_default_real_kind
;
1274 target
.type
= BT_REAL
;
1276 target
.is_c_interop
= 0;
1277 target
.is_iso_c
= 0;
1279 if (real
->ts
.type
!= BT_REAL
|| kind
!= real
->ts
.kind
)
1280 gfc_convert_type (real
, &target
, 2);
1281 if (imag
->ts
.type
!= BT_REAL
|| kind
!= imag
->ts
.kind
)
1282 gfc_convert_type (imag
, &target
, 2);
1284 e
= gfc_convert_complex (real
, imag
, kind
);
1285 e
->where
= gfc_current_locus
;
1287 gfc_free_expr (real
);
1288 gfc_free_expr (imag
);
1294 gfc_error ("Syntax error in COMPLEX constant at %C");
1299 gfc_free_expr (real
);
1300 gfc_free_expr (imag
);
1301 gfc_current_locus
= old_loc
;
1307 /* Match constants in any of several forms. Returns nonzero for a
1308 match, zero for no match. */
1311 gfc_match_literal_constant (gfc_expr
**result
, int signflag
)
1315 m
= match_complex_constant (result
);
1319 m
= match_string_constant (result
);
1323 m
= match_boz_constant (result
);
1327 m
= match_real_constant (result
, signflag
);
1331 m
= match_hollerith_constant (result
);
1335 m
= match_integer_constant (result
, signflag
);
1339 m
= match_logical_constant (result
);
1347 /* Match a single actual argument value. An actual argument is
1348 usually an expression, but can also be a procedure name. If the
1349 argument is a single name, it is not always possible to tell
1350 whether the name is a dummy procedure or not. We treat these cases
1351 by creating an argument that looks like a dummy procedure and
1352 fixing things later during resolution. */
1355 match_actual_arg (gfc_expr
**result
)
1357 char name
[GFC_MAX_SYMBOL_LEN
+ 1];
1358 gfc_symtree
*symtree
;
1363 gfc_gobble_whitespace ();
1364 where
= gfc_current_locus
;
1366 switch (gfc_match_name (name
))
1375 w
= gfc_current_locus
;
1376 gfc_gobble_whitespace ();
1377 c
= gfc_next_ascii_char ();
1378 gfc_current_locus
= w
;
1380 if (c
!= ',' && c
!= ')')
1383 if (gfc_find_sym_tree (name
, NULL
, 1, &symtree
))
1385 /* Handle error elsewhere. */
1387 /* Eliminate a couple of common cases where we know we don't
1388 have a function argument. */
1389 if (symtree
== NULL
)
1391 gfc_get_sym_tree (name
, NULL
, &symtree
);
1392 gfc_set_sym_referenced (symtree
->n
.sym
);
1398 sym
= symtree
->n
.sym
;
1399 gfc_set_sym_referenced (sym
);
1400 if (sym
->attr
.flavor
!= FL_PROCEDURE
1401 && sym
->attr
.flavor
!= FL_UNKNOWN
)
1404 /* If the symbol is a function with itself as the result and
1405 is being defined, then we have a variable. */
1406 if (sym
->attr
.function
&& sym
->result
== sym
)
1408 if (gfc_current_ns
->proc_name
== sym
1409 || (gfc_current_ns
->parent
!= NULL
1410 && gfc_current_ns
->parent
->proc_name
== sym
))
1414 && (sym
->ns
== gfc_current_ns
1415 || sym
->ns
== gfc_current_ns
->parent
))
1417 gfc_entry_list
*el
= NULL
;
1419 for (el
= sym
->ns
->entries
; el
; el
= el
->next
)
1429 e
= gfc_get_expr (); /* Leave it unknown for now */
1430 e
->symtree
= symtree
;
1431 e
->expr_type
= EXPR_VARIABLE
;
1432 e
->ts
.type
= BT_PROCEDURE
;
1439 gfc_current_locus
= where
;
1440 return gfc_match_expr (result
);
1444 /* Match a keyword argument. */
1447 match_keyword_arg (gfc_actual_arglist
*actual
, gfc_actual_arglist
*base
)
1449 char name
[GFC_MAX_SYMBOL_LEN
+ 1];
1450 gfc_actual_arglist
*a
;
1454 name_locus
= gfc_current_locus
;
1455 m
= gfc_match_name (name
);
1459 if (gfc_match_char ('=') != MATCH_YES
)
1465 m
= match_actual_arg (&actual
->expr
);
1469 /* Make sure this name has not appeared yet. */
1471 if (name
[0] != '\0')
1473 for (a
= base
; a
; a
= a
->next
)
1474 if (a
->name
!= NULL
&& strcmp (a
->name
, name
) == 0)
1476 gfc_error ("Keyword '%s' at %C has already appeared in the "
1477 "current argument list", name
);
1482 actual
->name
= gfc_get_string (name
);
1486 gfc_current_locus
= name_locus
;
1491 /* Match an argument list function, such as %VAL. */
1494 match_arg_list_function (gfc_actual_arglist
*result
)
1496 char name
[GFC_MAX_SYMBOL_LEN
+ 1];
1500 old_locus
= gfc_current_locus
;
1502 if (gfc_match_char ('%') != MATCH_YES
)
1508 m
= gfc_match ("%n (", name
);
1512 if (name
[0] != '\0')
1517 if (strncmp (name
, "loc", 3) == 0)
1519 result
->name
= "%LOC";
1523 if (strncmp (name
, "ref", 3) == 0)
1525 result
->name
= "%REF";
1529 if (strncmp (name
, "val", 3) == 0)
1531 result
->name
= "%VAL";
1540 if (gfc_notify_std (GFC_STD_GNU
, "Extension: argument list "
1541 "function at %C") == FAILURE
)
1547 m
= match_actual_arg (&result
->expr
);
1551 if (gfc_match_char (')') != MATCH_YES
)
1560 gfc_current_locus
= old_locus
;
1565 /* Matches an actual argument list of a function or subroutine, from
1566 the opening parenthesis to the closing parenthesis. The argument
1567 list is assumed to allow keyword arguments because we don't know if
1568 the symbol associated with the procedure has an implicit interface
1569 or not. We make sure keywords are unique. If sub_flag is set,
1570 we're matching the argument list of a subroutine. */
1573 gfc_match_actual_arglist (int sub_flag
, gfc_actual_arglist
**argp
)
1575 gfc_actual_arglist
*head
, *tail
;
1577 gfc_st_label
*label
;
1581 *argp
= tail
= NULL
;
1582 old_loc
= gfc_current_locus
;
1586 if (gfc_match_char ('(') == MATCH_NO
)
1587 return (sub_flag
) ? MATCH_YES
: MATCH_NO
;
1589 if (gfc_match_char (')') == MATCH_YES
)
1596 head
= tail
= gfc_get_actual_arglist ();
1599 tail
->next
= gfc_get_actual_arglist ();
1603 if (sub_flag
&& gfc_match_char ('*') == MATCH_YES
)
1605 m
= gfc_match_st_label (&label
);
1607 gfc_error ("Expected alternate return label at %C");
1611 tail
->label
= label
;
1615 /* After the first keyword argument is seen, the following
1616 arguments must also have keywords. */
1619 m
= match_keyword_arg (tail
, head
);
1621 if (m
== MATCH_ERROR
)
1625 gfc_error ("Missing keyword name in actual argument list at %C");
1632 /* Try an argument list function, like %VAL. */
1633 m
= match_arg_list_function (tail
);
1634 if (m
== MATCH_ERROR
)
1637 /* See if we have the first keyword argument. */
1640 m
= match_keyword_arg (tail
, head
);
1643 if (m
== MATCH_ERROR
)
1649 /* Try for a non-keyword argument. */
1650 m
= match_actual_arg (&tail
->expr
);
1651 if (m
== MATCH_ERROR
)
1660 if (gfc_match_char (')') == MATCH_YES
)
1662 if (gfc_match_char (',') != MATCH_YES
)
1670 gfc_error ("Syntax error in argument list at %C");
1673 gfc_free_actual_arglist (head
);
1674 gfc_current_locus
= old_loc
;
1680 /* Used by gfc_match_varspec() to extend the reference list by one
1684 extend_ref (gfc_expr
*primary
, gfc_ref
*tail
)
1686 if (primary
->ref
== NULL
)
1687 primary
->ref
= tail
= gfc_get_ref ();
1691 gfc_internal_error ("extend_ref(): Bad tail");
1692 tail
->next
= gfc_get_ref ();
1700 /* Match any additional specifications associated with the current
1701 variable like member references or substrings. If equiv_flag is
1702 set we only match stuff that is allowed inside an EQUIVALENCE
1703 statement. sub_flag tells whether we expect a type-bound procedure found
1704 to be a subroutine as part of CALL or a FUNCTION. */
1707 gfc_match_varspec (gfc_expr
*primary
, int equiv_flag
, bool sub_flag
)
1709 char name
[GFC_MAX_SYMBOL_LEN
+ 1];
1710 gfc_ref
*substring
, *tail
;
1711 gfc_component
*component
;
1712 gfc_symbol
*sym
= primary
->symtree
->n
.sym
;
1718 gfc_gobble_whitespace ();
1719 if ((equiv_flag
&& gfc_peek_ascii_char () == '(') || sym
->attr
.dimension
)
1721 /* In EQUIVALENCE, we don't know yet whether we are seeing
1722 an array, character variable or array of character
1723 variables. We'll leave the decision till resolve time. */
1724 tail
= extend_ref (primary
, tail
);
1725 tail
->type
= REF_ARRAY
;
1727 m
= gfc_match_array_ref (&tail
->u
.ar
, equiv_flag
? NULL
: sym
->as
,
1732 gfc_gobble_whitespace ();
1733 if (equiv_flag
&& gfc_peek_ascii_char () == '(')
1735 tail
= extend_ref (primary
, tail
);
1736 tail
->type
= REF_ARRAY
;
1738 m
= gfc_match_array_ref (&tail
->u
.ar
, NULL
, equiv_flag
);
1744 primary
->ts
= sym
->ts
;
1749 if (sym
->ts
.type
== BT_UNKNOWN
&& gfc_peek_ascii_char () == '%'
1750 && gfc_get_default_type (sym
, sym
->ns
)->type
== BT_DERIVED
)
1751 gfc_set_default_type (sym
, 0, sym
->ns
);
1753 if (sym
->ts
.type
!= BT_DERIVED
|| gfc_match_char ('%') != MATCH_YES
)
1754 goto check_substring
;
1756 sym
= sym
->ts
.derived
;
1763 m
= gfc_match_name (name
);
1765 gfc_error ("Expected structure component name at %C");
1769 tbp
= gfc_find_typebound_proc (sym
, &t
, name
, false);
1772 gfc_symbol
* tbp_sym
;
1777 gcc_assert (!tail
|| !tail
->next
);
1778 gcc_assert (primary
->expr_type
== EXPR_VARIABLE
);
1780 if (tbp
->typebound
->is_generic
)
1783 tbp_sym
= tbp
->typebound
->u
.specific
->n
.sym
;
1785 primary
->expr_type
= EXPR_COMPCALL
;
1786 primary
->value
.compcall
.tbp
= tbp
->typebound
;
1787 primary
->value
.compcall
.name
= tbp
->name
;
1788 gcc_assert (primary
->symtree
->n
.sym
->attr
.referenced
);
1790 primary
->ts
= tbp_sym
->ts
;
1792 m
= gfc_match_actual_arglist (tbp
->typebound
->subroutine
,
1793 &primary
->value
.compcall
.actual
);
1794 if (m
== MATCH_ERROR
)
1799 primary
->value
.compcall
.actual
= NULL
;
1802 gfc_error ("Expected argument list at %C");
1807 gfc_set_sym_referenced (tbp
->n
.sym
);
1812 component
= gfc_find_component (sym
, name
, false, false);
1813 if (component
== NULL
)
1816 tail
= extend_ref (primary
, tail
);
1817 tail
->type
= REF_COMPONENT
;
1819 tail
->u
.c
.component
= component
;
1820 tail
->u
.c
.sym
= sym
;
1822 primary
->ts
= component
->ts
;
1824 if (component
->as
!= NULL
)
1826 tail
= extend_ref (primary
, tail
);
1827 tail
->type
= REF_ARRAY
;
1829 m
= gfc_match_array_ref (&tail
->u
.ar
, component
->as
, equiv_flag
);
1834 if (component
->ts
.type
!= BT_DERIVED
1835 || gfc_match_char ('%') != MATCH_YES
)
1838 sym
= component
->ts
.derived
;
1843 if (primary
->ts
.type
== BT_UNKNOWN
)
1845 if (gfc_get_default_type (sym
, sym
->ns
)->type
== BT_CHARACTER
)
1847 gfc_set_default_type (sym
, 0, sym
->ns
);
1848 primary
->ts
= sym
->ts
;
1853 if (primary
->ts
.type
== BT_CHARACTER
)
1855 switch (match_substring (primary
->ts
.cl
, equiv_flag
, &substring
))
1859 primary
->ref
= substring
;
1861 tail
->next
= substring
;
1863 if (primary
->expr_type
== EXPR_CONSTANT
)
1864 primary
->expr_type
= EXPR_SUBSTRING
;
1867 primary
->ts
.cl
= NULL
;
1874 gfc_clear_ts (&primary
->ts
);
1875 gfc_clear_ts (&sym
->ts
);
1888 /* Given an expression that is a variable, figure out what the
1889 ultimate variable's type and attribute is, traversing the reference
1890 structures if necessary.
1892 This subroutine is trickier than it looks. We start at the base
1893 symbol and store the attribute. Component references load a
1894 completely new attribute.
1896 A couple of rules come into play. Subobjects of targets are always
1897 targets themselves. If we see a component that goes through a
1898 pointer, then the expression must also be a target, since the
1899 pointer is associated with something (if it isn't core will soon be
1900 dumped). If we see a full part or section of an array, the
1901 expression is also an array.
1903 We can have at most one full array reference. */
1906 gfc_variable_attr (gfc_expr
*expr
, gfc_typespec
*ts
)
1908 int dimension
, pointer
, allocatable
, target
;
1909 symbol_attribute attr
;
1912 if (expr
->expr_type
!= EXPR_VARIABLE
)
1913 gfc_internal_error ("gfc_variable_attr(): Expression isn't a variable");
1916 attr
= expr
->symtree
->n
.sym
->attr
;
1918 dimension
= attr
.dimension
;
1919 pointer
= attr
.pointer
;
1920 allocatable
= attr
.allocatable
;
1922 target
= attr
.target
;
1926 if (ts
!= NULL
&& expr
->ts
.type
== BT_UNKNOWN
)
1927 *ts
= expr
->symtree
->n
.sym
->ts
;
1929 for (; ref
; ref
= ref
->next
)
1934 switch (ref
->u
.ar
.type
)
1941 allocatable
= pointer
= 0;
1946 allocatable
= pointer
= 0;
1950 gfc_internal_error ("gfc_variable_attr(): Bad array reference");
1956 attr
= ref
->u
.c
.component
->attr
;
1959 *ts
= ref
->u
.c
.component
->ts
;
1960 /* Don't set the string length if a substring reference
1962 if (ts
->type
== BT_CHARACTER
1963 && ref
->next
&& ref
->next
->type
== REF_SUBSTRING
)
1967 pointer
= ref
->u
.c
.component
->attr
.pointer
;
1968 allocatable
= ref
->u
.c
.component
->attr
.allocatable
;
1975 allocatable
= pointer
= 0;
1979 attr
.dimension
= dimension
;
1980 attr
.pointer
= pointer
;
1981 attr
.allocatable
= allocatable
;
1982 attr
.target
= target
;
1988 /* Return the attribute from a general expression. */
1991 gfc_expr_attr (gfc_expr
*e
)
1993 symbol_attribute attr
;
1995 switch (e
->expr_type
)
1998 attr
= gfc_variable_attr (e
, NULL
);
2002 gfc_clear_attr (&attr
);
2004 if (e
->value
.function
.esym
!= NULL
)
2005 attr
= e
->value
.function
.esym
->result
->attr
;
2007 /* TODO: NULL() returns pointers. May have to take care of this
2013 gfc_clear_attr (&attr
);
2021 /* Match a structure constructor. The initial symbol has already been
2024 typedef struct gfc_structure_ctor_component
2029 struct gfc_structure_ctor_component
* next
;
2031 gfc_structure_ctor_component
;
2033 #define gfc_get_structure_ctor_component() XCNEW (gfc_structure_ctor_component)
2036 gfc_free_structure_ctor_component (gfc_structure_ctor_component
*comp
)
2038 gfc_free (comp
->name
);
2039 gfc_free_expr (comp
->val
);
2043 /* Translate the component list into the actual constructor by sorting it in
2044 the order required; this also checks along the way that each and every
2045 component actually has an initializer and handles default initializers
2046 for components without explicit value given. */
2048 build_actual_constructor (gfc_structure_ctor_component
**comp_head
,
2049 gfc_constructor
**ctor_head
, gfc_symbol
*sym
)
2051 gfc_structure_ctor_component
*comp_iter
;
2052 gfc_constructor
*ctor_tail
= NULL
;
2053 gfc_component
*comp
;
2055 for (comp
= sym
->components
; comp
; comp
= comp
->next
)
2057 gfc_structure_ctor_component
**next_ptr
;
2058 gfc_expr
*value
= NULL
;
2060 /* Try to find the initializer for the current component by name. */
2061 next_ptr
= comp_head
;
2062 for (comp_iter
= *comp_head
; comp_iter
; comp_iter
= comp_iter
->next
)
2064 if (!strcmp (comp_iter
->name
, comp
->name
))
2066 next_ptr
= &comp_iter
->next
;
2069 /* If an extension, try building the parent derived type by building
2070 a value expression for the parent derived type and calling self. */
2071 if (!comp_iter
&& comp
== sym
->components
&& sym
->attr
.extension
)
2073 value
= gfc_get_expr ();
2074 value
->expr_type
= EXPR_STRUCTURE
;
2075 value
->value
.constructor
= NULL
;
2076 value
->ts
= comp
->ts
;
2077 value
->where
= gfc_current_locus
;
2079 if (build_actual_constructor (comp_head
, &value
->value
.constructor
,
2080 comp
->ts
.derived
) == FAILURE
)
2082 gfc_free_expr (value
);
2085 *ctor_head
= ctor_tail
= gfc_get_constructor ();
2086 ctor_tail
->expr
= value
;
2090 /* If it was not found, try the default initializer if there's any;
2091 otherwise, it's an error. */
2094 if (comp
->initializer
)
2096 if (gfc_notify_std (GFC_STD_F2003
, "Fortran 2003: Structure"
2097 " constructor with missing optional arguments"
2098 " at %C") == FAILURE
)
2100 value
= gfc_copy_expr (comp
->initializer
);
2104 gfc_error ("No initializer for component '%s' given in the"
2105 " structure constructor at %C!", comp
->name
);
2110 value
= comp_iter
->val
;
2112 /* Add the value to the constructor chain built. */
2115 ctor_tail
->next
= gfc_get_constructor ();
2116 ctor_tail
= ctor_tail
->next
;
2119 *ctor_head
= ctor_tail
= gfc_get_constructor ();
2121 ctor_tail
->expr
= value
;
2123 /* Remove the entry from the component list. We don't want the expression
2124 value to be free'd, so set it to NULL. */
2127 *next_ptr
= comp_iter
->next
;
2128 comp_iter
->val
= NULL
;
2129 gfc_free_structure_ctor_component (comp_iter
);
2136 gfc_match_structure_constructor (gfc_symbol
*sym
, gfc_expr
**result
,
2139 gfc_structure_ctor_component
*comp_tail
, *comp_head
, *comp_iter
;
2140 gfc_constructor
*ctor_head
, *ctor_tail
;
2141 gfc_component
*comp
; /* Is set NULL when named component is first seen */
2145 const char* last_name
= NULL
;
2147 comp_tail
= comp_head
= NULL
;
2148 ctor_head
= ctor_tail
= NULL
;
2150 if (!parent
&& gfc_match_char ('(') != MATCH_YES
)
2153 where
= gfc_current_locus
;
2155 gfc_find_component (sym
, NULL
, false, true);
2157 /* Check that we're not about to construct an ABSTRACT type. */
2158 if (!parent
&& sym
->attr
.abstract
)
2160 gfc_error ("Can't construct ABSTRACT type '%s' at %C", sym
->name
);
2164 /* Match the component list and store it in a list together with the
2165 corresponding component names. Check for empty argument list first. */
2166 if (gfc_match_char (')') != MATCH_YES
)
2168 comp
= sym
->components
;
2171 gfc_component
*this_comp
= NULL
;
2174 comp_tail
= comp_head
= gfc_get_structure_ctor_component ();
2177 comp_tail
->next
= gfc_get_structure_ctor_component ();
2178 comp_tail
= comp_tail
->next
;
2180 comp_tail
->name
= XCNEWVEC (char, GFC_MAX_SYMBOL_LEN
+ 1);
2181 comp_tail
->val
= NULL
;
2182 comp_tail
->where
= gfc_current_locus
;
2184 /* Try matching a component name. */
2185 if (gfc_match_name (comp_tail
->name
) == MATCH_YES
2186 && gfc_match_char ('=') == MATCH_YES
)
2188 if (gfc_notify_std (GFC_STD_F2003
, "Fortran 2003: Structure"
2189 " constructor with named arguments at %C")
2193 last_name
= comp_tail
->name
;
2198 /* Components without name are not allowed after the first named
2199 component initializer! */
2203 gfc_error ("Component initializer without name after"
2204 " component named %s at %C!", last_name
);
2206 gfc_error ("Too many components in structure constructor at"
2211 gfc_current_locus
= comp_tail
->where
;
2212 strncpy (comp_tail
->name
, comp
->name
, GFC_MAX_SYMBOL_LEN
+ 1);
2215 /* Find the current component in the structure definition and check
2216 its access is not private. */
2218 this_comp
= gfc_find_component (sym
, comp
->name
, false, false);
2221 this_comp
= gfc_find_component (sym
,
2222 (const char *)comp_tail
->name
,
2224 comp
= NULL
; /* Reset needed! */
2227 /* Here we can check if a component name is given which does not
2228 correspond to any component of the defined structure. */
2232 /* Check if this component is already given a value. */
2233 for (comp_iter
= comp_head
; comp_iter
!= comp_tail
;
2234 comp_iter
= comp_iter
->next
)
2236 gcc_assert (comp_iter
);
2237 if (!strcmp (comp_iter
->name
, comp_tail
->name
))
2239 gfc_error ("Component '%s' is initialized twice in the"
2240 " structure constructor at %C!", comp_tail
->name
);
2245 /* Match the current initializer expression. */
2246 m
= gfc_match_expr (&comp_tail
->val
);
2249 if (m
== MATCH_ERROR
)
2252 /* If not explicitly a parent constructor, gather up the components
2254 if (comp
&& comp
== sym
->components
2255 && sym
->attr
.extension
2256 && (comp_tail
->val
->ts
.type
!= BT_DERIVED
2258 comp_tail
->val
->ts
.derived
!= this_comp
->ts
.derived
))
2260 gfc_current_locus
= where
;
2261 gfc_free_expr (comp_tail
->val
);
2262 comp_tail
->val
= NULL
;
2264 m
= gfc_match_structure_constructor (comp
->ts
.derived
,
2265 &comp_tail
->val
, true);
2268 if (m
== MATCH_ERROR
)
2275 if (parent
&& !comp
)
2279 while (gfc_match_char (',') == MATCH_YES
);
2281 if (!parent
&& gfc_match_char (')') != MATCH_YES
)
2285 if (build_actual_constructor (&comp_head
, &ctor_head
, sym
) == FAILURE
)
2288 /* No component should be left, as this should have caused an error in the
2289 loop constructing the component-list (name that does not correspond to any
2290 component in the structure definition). */
2291 if (comp_head
&& sym
->attr
.extension
)
2293 for (comp_iter
= comp_head
; comp_iter
; comp_iter
= comp_iter
->next
)
2295 gfc_error ("component '%s' at %L has already been set by a "
2296 "parent derived type constructor", comp_iter
->name
,
2302 gcc_assert (!comp_head
);
2304 e
= gfc_get_expr ();
2306 e
->expr_type
= EXPR_STRUCTURE
;
2308 e
->ts
.type
= BT_DERIVED
;
2309 e
->ts
.derived
= sym
;
2312 e
->value
.constructor
= ctor_head
;
2318 gfc_error ("Syntax error in structure constructor at %C");
2321 for (comp_iter
= comp_head
; comp_iter
; )
2323 gfc_structure_ctor_component
*next
= comp_iter
->next
;
2324 gfc_free_structure_ctor_component (comp_iter
);
2327 gfc_free_constructor (ctor_head
);
2332 /* If the symbol is an implicit do loop index and implicitly typed,
2333 it should not be host associated. Provide a symtree from the
2334 current namespace. */
2336 check_for_implicit_index (gfc_symtree
**st
, gfc_symbol
**sym
)
2338 if ((*sym
)->attr
.flavor
== FL_VARIABLE
2339 && (*sym
)->ns
!= gfc_current_ns
2340 && (*sym
)->attr
.implied_index
2341 && (*sym
)->attr
.implicit_type
2342 && !(*sym
)->attr
.use_assoc
)
2345 i
= gfc_get_sym_tree ((*sym
)->name
, NULL
, st
);
2348 *sym
= (*st
)->n
.sym
;
2354 /* Matches a variable name followed by anything that might follow it--
2355 array reference, argument list of a function, etc. */
2358 gfc_match_rvalue (gfc_expr
**result
)
2360 gfc_actual_arglist
*actual_arglist
;
2361 char name
[GFC_MAX_SYMBOL_LEN
+ 1], argname
[GFC_MAX_SYMBOL_LEN
+ 1];
2364 gfc_symtree
*symtree
;
2365 locus where
, old_loc
;
2373 m
= gfc_match_name (name
);
2377 if (gfc_find_state (COMP_INTERFACE
) == SUCCESS
2378 && !gfc_current_ns
->has_import_set
)
2379 i
= gfc_get_sym_tree (name
, NULL
, &symtree
);
2381 i
= gfc_get_ha_sym_tree (name
, &symtree
);
2386 sym
= symtree
->n
.sym
;
2388 where
= gfc_current_locus
;
2390 /* If this is an implicit do loop index and implicitly typed,
2391 it should not be host associated. */
2392 m
= check_for_implicit_index (&symtree
, &sym
);
2396 gfc_set_sym_referenced (sym
);
2397 sym
->attr
.implied_index
= 0;
2399 if (sym
->attr
.function
&& sym
->result
== sym
)
2401 /* See if this is a directly recursive function call. */
2402 gfc_gobble_whitespace ();
2403 if (sym
->attr
.recursive
2404 && gfc_peek_ascii_char () == '('
2405 && gfc_current_ns
->proc_name
== sym
2406 && !sym
->attr
.dimension
)
2408 gfc_error ("'%s' at %C is the name of a recursive function "
2409 "and so refers to the result variable. Use an "
2410 "explicit RESULT variable for direct recursion "
2411 "(12.5.2.1)", sym
->name
);
2415 if (gfc_current_ns
->proc_name
== sym
2416 || (gfc_current_ns
->parent
!= NULL
2417 && gfc_current_ns
->parent
->proc_name
== sym
))
2421 && (sym
->ns
== gfc_current_ns
2422 || sym
->ns
== gfc_current_ns
->parent
))
2424 gfc_entry_list
*el
= NULL
;
2426 for (el
= sym
->ns
->entries
; el
; el
= el
->next
)
2432 if (gfc_matching_procptr_assignment
)
2435 if (sym
->attr
.function
|| sym
->attr
.external
|| sym
->attr
.intrinsic
)
2438 if (sym
->attr
.generic
)
2439 goto generic_function
;
2441 switch (sym
->attr
.flavor
)
2445 e
= gfc_get_expr ();
2447 e
->expr_type
= EXPR_VARIABLE
;
2448 e
->symtree
= symtree
;
2450 m
= gfc_match_varspec (e
, 0, false);
2454 /* A statement of the form "REAL, parameter :: a(0:10) = 1" will
2455 end up here. Unfortunately, sym->value->expr_type is set to
2456 EXPR_CONSTANT, and so the if () branch would be followed without
2457 the !sym->as check. */
2458 if (sym
->value
&& sym
->value
->expr_type
!= EXPR_ARRAY
&& !sym
->as
)
2459 e
= gfc_copy_expr (sym
->value
);
2462 e
= gfc_get_expr ();
2463 e
->expr_type
= EXPR_VARIABLE
;
2466 e
->symtree
= symtree
;
2467 m
= gfc_match_varspec (e
, 0, false);
2469 if (sym
->ts
.is_c_interop
|| sym
->ts
.is_iso_c
)
2472 /* Variable array references to derived type parameters cause
2473 all sorts of headaches in simplification. Treating such
2474 expressions as variable works just fine for all array
2476 if (sym
->value
&& sym
->ts
.type
== BT_DERIVED
&& e
->ref
)
2478 for (ref
= e
->ref
; ref
; ref
= ref
->next
)
2479 if (ref
->type
== REF_ARRAY
)
2482 if (ref
== NULL
|| ref
->u
.ar
.type
== AR_FULL
)
2488 e
= gfc_get_expr ();
2489 e
->expr_type
= EXPR_VARIABLE
;
2490 e
->symtree
= symtree
;
2497 sym
= gfc_use_derived (sym
);
2501 m
= gfc_match_structure_constructor (sym
, &e
, false);
2504 /* If we're here, then the name is known to be the name of a
2505 procedure, yet it is not sure to be the name of a function. */
2508 /* Procedure Pointer Assignments. */
2510 if (gfc_matching_procptr_assignment
)
2512 gfc_gobble_whitespace ();
2513 if (gfc_peek_ascii_char () == '(')
2514 /* Parse functions returning a procptr. */
2517 if (gfc_is_intrinsic (sym
, 0, gfc_current_locus
)
2518 || gfc_is_intrinsic (sym
, 1, gfc_current_locus
))
2519 sym
->attr
.intrinsic
= 1;
2520 e
= gfc_get_expr ();
2521 e
->expr_type
= EXPR_VARIABLE
;
2522 e
->symtree
= symtree
;
2523 m
= gfc_match_varspec (e
, 0, false);
2527 if (sym
->attr
.subroutine
)
2529 gfc_error ("Unexpected use of subroutine name '%s' at %C",
2535 /* At this point, the name has to be a non-statement function.
2536 If the name is the same as the current function being
2537 compiled, then we have a variable reference (to the function
2538 result) if the name is non-recursive. */
2540 st
= gfc_enclosing_unit (NULL
);
2542 if (st
!= NULL
&& st
->state
== COMP_FUNCTION
2544 && !sym
->attr
.recursive
)
2546 e
= gfc_get_expr ();
2547 e
->symtree
= symtree
;
2548 e
->expr_type
= EXPR_VARIABLE
;
2550 m
= gfc_match_varspec (e
, 0, false);
2554 /* Match a function reference. */
2556 m
= gfc_match_actual_arglist (0, &actual_arglist
);
2559 if (sym
->attr
.proc
== PROC_ST_FUNCTION
)
2560 gfc_error ("Statement function '%s' requires argument list at %C",
2563 gfc_error ("Function '%s' requires an argument list at %C",
2576 gfc_get_ha_sym_tree (name
, &symtree
); /* Can't fail */
2577 sym
= symtree
->n
.sym
;
2579 e
= gfc_get_expr ();
2580 e
->symtree
= symtree
;
2581 e
->expr_type
= EXPR_FUNCTION
;
2582 e
->value
.function
.actual
= actual_arglist
;
2583 e
->where
= gfc_current_locus
;
2585 if (sym
->as
!= NULL
)
2586 e
->rank
= sym
->as
->rank
;
2588 if (!sym
->attr
.function
2589 && gfc_add_function (&sym
->attr
, sym
->name
, NULL
) == FAILURE
)
2595 /* Check here for the existence of at least one argument for the
2596 iso_c_binding functions C_LOC, C_FUNLOC, and C_ASSOCIATED. The
2597 argument(s) given will be checked in gfc_iso_c_func_interface,
2598 during resolution of the function call. */
2599 if (sym
->attr
.is_iso_c
== 1
2600 && (sym
->from_intmod
== INTMOD_ISO_C_BINDING
2601 && (sym
->intmod_sym_id
== ISOCBINDING_LOC
2602 || sym
->intmod_sym_id
== ISOCBINDING_FUNLOC
2603 || sym
->intmod_sym_id
== ISOCBINDING_ASSOCIATED
)))
2605 /* make sure we were given a param */
2606 if (actual_arglist
== NULL
)
2608 gfc_error ("Missing argument to '%s' at %C", sym
->name
);
2614 if (sym
->result
== NULL
)
2622 /* Special case for derived type variables that get their types
2623 via an IMPLICIT statement. This can't wait for the
2624 resolution phase. */
2626 if (gfc_peek_ascii_char () == '%'
2627 && sym
->ts
.type
== BT_UNKNOWN
2628 && gfc_get_default_type (sym
, sym
->ns
)->type
== BT_DERIVED
)
2629 gfc_set_default_type (sym
, 0, sym
->ns
);
2631 /* If the symbol has a dimension attribute, the expression is a
2634 if (sym
->attr
.dimension
)
2636 if (gfc_add_flavor (&sym
->attr
, FL_VARIABLE
,
2637 sym
->name
, NULL
) == FAILURE
)
2643 e
= gfc_get_expr ();
2644 e
->symtree
= symtree
;
2645 e
->expr_type
= EXPR_VARIABLE
;
2646 m
= gfc_match_varspec (e
, 0, false);
2650 /* Name is not an array, so we peek to see if a '(' implies a
2651 function call or a substring reference. Otherwise the
2652 variable is just a scalar. */
2654 gfc_gobble_whitespace ();
2655 if (gfc_peek_ascii_char () != '(')
2657 /* Assume a scalar variable */
2658 e
= gfc_get_expr ();
2659 e
->symtree
= symtree
;
2660 e
->expr_type
= EXPR_VARIABLE
;
2662 if (gfc_add_flavor (&sym
->attr
, FL_VARIABLE
,
2663 sym
->name
, NULL
) == FAILURE
)
2669 /*FIXME:??? gfc_match_varspec does set this for us: */
2671 m
= gfc_match_varspec (e
, 0, false);
2675 /* See if this is a function reference with a keyword argument
2676 as first argument. We do this because otherwise a spurious
2677 symbol would end up in the symbol table. */
2679 old_loc
= gfc_current_locus
;
2680 m2
= gfc_match (" ( %n =", argname
);
2681 gfc_current_locus
= old_loc
;
2683 e
= gfc_get_expr ();
2684 e
->symtree
= symtree
;
2686 if (m2
!= MATCH_YES
)
2688 /* Try to figure out whether we're dealing with a character type.
2689 We're peeking ahead here, because we don't want to call
2690 match_substring if we're dealing with an implicitly typed
2691 non-character variable. */
2692 implicit_char
= false;
2693 if (sym
->ts
.type
== BT_UNKNOWN
)
2695 ts
= gfc_get_default_type (sym
,NULL
);
2696 if (ts
->type
== BT_CHARACTER
)
2697 implicit_char
= true;
2700 /* See if this could possibly be a substring reference of a name
2701 that we're not sure is a variable yet. */
2703 if ((implicit_char
|| sym
->ts
.type
== BT_CHARACTER
)
2704 && match_substring (sym
->ts
.cl
, 0, &e
->ref
) == MATCH_YES
)
2707 e
->expr_type
= EXPR_VARIABLE
;
2709 if (sym
->attr
.flavor
!= FL_VARIABLE
2710 && gfc_add_flavor (&sym
->attr
, FL_VARIABLE
,
2711 sym
->name
, NULL
) == FAILURE
)
2717 if (sym
->ts
.type
== BT_UNKNOWN
2718 && gfc_set_default_type (sym
, 1, NULL
) == FAILURE
)
2732 /* Give up, assume we have a function. */
2734 gfc_get_sym_tree (name
, NULL
, &symtree
); /* Can't fail */
2735 sym
= symtree
->n
.sym
;
2736 e
->expr_type
= EXPR_FUNCTION
;
2738 if (!sym
->attr
.function
2739 && gfc_add_function (&sym
->attr
, sym
->name
, NULL
) == FAILURE
)
2747 m
= gfc_match_actual_arglist (0, &e
->value
.function
.actual
);
2749 gfc_error ("Missing argument list in function '%s' at %C", sym
->name
);
2757 /* If our new function returns a character, array or structure
2758 type, it might have subsequent references. */
2760 m
= gfc_match_varspec (e
, 0, false);
2767 gfc_get_sym_tree (name
, NULL
, &symtree
); /* Can't fail */
2769 e
= gfc_get_expr ();
2770 e
->symtree
= symtree
;
2771 e
->expr_type
= EXPR_FUNCTION
;
2773 m
= gfc_match_actual_arglist (0, &e
->value
.function
.actual
);
2777 gfc_error ("Symbol at %C is not appropriate for an expression");
2793 /* Match a variable, i.e. something that can be assigned to. This
2794 starts as a symbol, can be a structure component or an array
2795 reference. It can be a function if the function doesn't have a
2796 separate RESULT variable. If the symbol has not been previously
2797 seen, we assume it is a variable.
2799 This function is called by two interface functions:
2800 gfc_match_variable, which has host_flag = 1, and
2801 gfc_match_equiv_variable, with host_flag = 0, to restrict the
2802 match of the symbol to the local scope. */
2805 match_variable (gfc_expr
**result
, int equiv_flag
, int host_flag
)
2813 /* Since nothing has any business being an lvalue in a module
2814 specification block, an interface block or a contains section,
2815 we force the changed_symbols mechanism to work by setting
2816 host_flag to 0. This prevents valid symbols that have the name
2817 of keywords, such as 'end', being turned into variables by
2818 failed matching to assignments for, e.g., END INTERFACE. */
2819 if (gfc_current_state () == COMP_MODULE
2820 || gfc_current_state () == COMP_INTERFACE
2821 || gfc_current_state () == COMP_CONTAINS
)
2824 where
= gfc_current_locus
;
2825 m
= gfc_match_sym_tree (&st
, host_flag
);
2831 /* If this is an implicit do loop index and implicitly typed,
2832 it should not be host associated. */
2833 m
= check_for_implicit_index (&st
, &sym
);
2837 sym
->attr
.implied_index
= 0;
2839 gfc_set_sym_referenced (sym
);
2840 switch (sym
->attr
.flavor
)
2843 if (sym
->attr
.is_protected
&& sym
->attr
.use_assoc
)
2845 gfc_error ("Assigning to PROTECTED variable at %C");
2852 sym_flavor flavor
= FL_UNKNOWN
;
2854 gfc_gobble_whitespace ();
2856 if (sym
->attr
.external
|| sym
->attr
.procedure
2857 || sym
->attr
.function
|| sym
->attr
.subroutine
)
2858 flavor
= FL_PROCEDURE
;
2860 /* If it is not a procedure, is not typed and is host associated,
2861 we cannot give it a flavor yet. */
2862 else if (sym
->ns
== gfc_current_ns
->parent
2863 && sym
->ts
.type
== BT_UNKNOWN
)
2866 /* These are definitive indicators that this is a variable. */
2867 else if (gfc_peek_ascii_char () != '(' || sym
->ts
.type
!= BT_UNKNOWN
2868 || sym
->attr
.pointer
|| sym
->as
!= NULL
)
2869 flavor
= FL_VARIABLE
;
2871 if (flavor
!= FL_UNKNOWN
2872 && gfc_add_flavor (&sym
->attr
, flavor
, sym
->name
, NULL
) == FAILURE
)
2879 gfc_error ("Named constant at %C in an EQUIVALENCE");
2881 gfc_error ("Cannot assign to a named constant at %C");
2886 /* Check for a nonrecursive function result variable. */
2887 if (sym
->attr
.function
2888 && !sym
->attr
.external
2889 && sym
->result
== sym
2890 && ((sym
== gfc_current_ns
->proc_name
2891 && sym
== gfc_current_ns
->proc_name
->result
)
2892 || (gfc_current_ns
->parent
2893 && sym
== gfc_current_ns
->parent
->proc_name
->result
)
2895 && sym
->ns
== gfc_current_ns
)
2897 && sym
->ns
== gfc_current_ns
->parent
)))
2899 /* If a function result is a derived type, then the derived
2900 type may still have to be resolved. */
2902 if (sym
->ts
.type
== BT_DERIVED
2903 && gfc_use_derived (sym
->ts
.derived
) == NULL
)
2908 if (sym
->attr
.proc_pointer
)
2911 /* Fall through to error */
2914 gfc_error ("'%s' at %C is not a variable", sym
->name
);
2918 /* Special case for derived type variables that get their types
2919 via an IMPLICIT statement. This can't wait for the
2920 resolution phase. */
2923 gfc_namespace
* implicit_ns
;
2925 if (gfc_current_ns
->proc_name
== sym
)
2926 implicit_ns
= gfc_current_ns
;
2928 implicit_ns
= sym
->ns
;
2930 if (gfc_peek_ascii_char () == '%'
2931 && sym
->ts
.type
== BT_UNKNOWN
2932 && gfc_get_default_type (sym
, implicit_ns
)->type
== BT_DERIVED
)
2933 gfc_set_default_type (sym
, 0, implicit_ns
);
2936 expr
= gfc_get_expr ();
2938 expr
->expr_type
= EXPR_VARIABLE
;
2941 expr
->where
= where
;
2943 /* Now see if we have to do more. */
2944 m
= gfc_match_varspec (expr
, equiv_flag
, false);
2947 gfc_free_expr (expr
);
2957 gfc_match_variable (gfc_expr
**result
, int equiv_flag
)
2959 return match_variable (result
, equiv_flag
, 1);
2964 gfc_match_equiv_variable (gfc_expr
**result
)
2966 return match_variable (result
, 1, 0);