1 /* Primary expression subroutines
2 Copyright (C) 2000-2015 Free Software Foundation, Inc.
3 Contributed by Andy Vaught
5 This file is part of GCC.
7 GCC is free software; you can redistribute it and/or modify it under
8 the terms of the GNU General Public License as published by the Free
9 Software Foundation; either version 3, or (at your option) any later
12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
17 You should have received a copy of the GNU General Public License
18 along with GCC; see the file COPYING3. If not see
19 <http://www.gnu.org/licenses/>. */
23 #include "coretypes.h"
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.
36 The argument 'is_iso_c' signals whether the kind is an ISO_C_BINDING
37 symbol like e.g. 'c_int'. */
40 match_kind_param (int *kind
, int *is_iso_c
)
42 char name
[GFC_MAX_SYMBOL_LEN
+ 1];
49 m
= gfc_match_small_literal_int (kind
, NULL
);
53 m
= gfc_match_name (name
);
57 if (gfc_find_symbol (name
, NULL
, 1, &sym
))
63 *is_iso_c
= sym
->attr
.is_iso_c
;
65 if (sym
->attr
.flavor
!= FL_PARAMETER
)
68 if (sym
->value
== NULL
)
71 p
= gfc_extract_int (sym
->value
, kind
);
75 gfc_set_sym_referenced (sym
);
84 /* Get a trailing kind-specification for non-character variables.
86 * the integer kind value or
87 * -1 if an error was generated,
88 * -2 if no kind was found.
89 The argument 'is_iso_c' signals whether the kind is an ISO_C_BINDING
90 symbol like e.g. 'c_int'. */
93 get_kind (int *is_iso_c
)
100 if (gfc_match_char ('_') != MATCH_YES
)
103 m
= match_kind_param (&kind
, is_iso_c
);
105 gfc_error ("Missing kind-parameter at %C");
107 return (m
== MATCH_YES
) ? kind
: -1;
111 /* Given a character and a radix, see if the character is a valid
112 digit in that radix. */
115 gfc_check_digit (char c
, int radix
)
122 r
= ('0' <= c
&& c
<= '1');
126 r
= ('0' <= c
&& c
<= '7');
130 r
= ('0' <= c
&& c
<= '9');
138 gfc_internal_error ("gfc_check_digit(): bad radix");
145 /* Match the digit string part of an integer if signflag is not set,
146 the signed digit string part if signflag is set. If the buffer
147 is NULL, we just count characters for the resolution pass. Returns
148 the number of characters matched, -1 for no match. */
151 match_digits (int signflag
, int radix
, char *buffer
)
158 c
= gfc_next_ascii_char ();
160 if (signflag
&& (c
== '+' || c
== '-'))
164 gfc_gobble_whitespace ();
165 c
= gfc_next_ascii_char ();
169 if (!gfc_check_digit (c
, radix
))
178 old_loc
= gfc_current_locus
;
179 c
= gfc_next_ascii_char ();
181 if (!gfc_check_digit (c
, radix
))
189 gfc_current_locus
= old_loc
;
195 /* Match an integer (digit string and optional kind).
196 A sign will be accepted if signflag is set. */
199 match_integer_constant (gfc_expr
**result
, int signflag
)
201 int length
, kind
, is_iso_c
;
206 old_loc
= gfc_current_locus
;
207 gfc_gobble_whitespace ();
209 length
= match_digits (signflag
, 10, NULL
);
210 gfc_current_locus
= old_loc
;
214 buffer
= (char *) alloca (length
+ 1);
215 memset (buffer
, '\0', length
+ 1);
217 gfc_gobble_whitespace ();
219 match_digits (signflag
, 10, buffer
);
221 kind
= get_kind (&is_iso_c
);
223 kind
= gfc_default_integer_kind
;
227 if (kind
== 4 && flag_integer4_kind
== 8)
230 if (gfc_validate_kind (BT_INTEGER
, kind
, true) < 0)
232 gfc_error ("Integer kind %d at %C not available", kind
);
236 e
= gfc_convert_integer (buffer
, kind
, 10, &gfc_current_locus
);
237 e
->ts
.is_c_interop
= is_iso_c
;
239 if (gfc_range_check (e
) != ARITH_OK
)
241 gfc_error ("Integer too big for its kind at %C. This check can be "
242 "disabled with the option -fno-range-check");
253 /* Match a Hollerith constant. */
256 match_hollerith_constant (gfc_expr
**result
)
264 old_loc
= gfc_current_locus
;
265 gfc_gobble_whitespace ();
267 if (match_integer_constant (&e
, 0) == MATCH_YES
268 && gfc_match_char ('h') == MATCH_YES
)
270 if (!gfc_notify_std (GFC_STD_LEGACY
, "Hollerith constant at %C"))
273 msg
= gfc_extract_int (e
, &num
);
281 gfc_error ("Invalid Hollerith constant: %L must contain at least "
282 "one character", &old_loc
);
285 if (e
->ts
.kind
!= gfc_default_integer_kind
)
287 gfc_error ("Invalid Hollerith constant: Integer kind at %L "
288 "should be default", &old_loc
);
294 e
= gfc_get_constant_expr (BT_HOLLERITH
, gfc_default_character_kind
,
297 /* Calculate padding needed to fit default integer memory. */
298 pad
= gfc_default_integer_kind
- (num
% gfc_default_integer_kind
);
300 e
->representation
.string
= XCNEWVEC (char, num
+ pad
+ 1);
302 for (i
= 0; i
< num
; i
++)
304 gfc_char_t c
= gfc_next_char_literal (INSTRING_WARN
);
305 if (! gfc_wide_fits_in_byte (c
))
307 gfc_error ("Invalid Hollerith constant at %L contains a "
308 "wide character", &old_loc
);
312 e
->representation
.string
[i
] = (unsigned char) c
;
315 /* Now pad with blanks and end with a null char. */
316 for (i
= 0; i
< pad
; i
++)
317 e
->representation
.string
[num
+ i
] = ' ';
319 e
->representation
.string
[num
+ i
] = '\0';
320 e
->representation
.length
= num
+ pad
;
329 gfc_current_locus
= old_loc
;
338 /* Match a binary, octal or hexadecimal constant that can be found in
339 a DATA statement. The standard permits b'010...', o'73...', and
340 z'a1...' where b, o, and z can be capital letters. This function
341 also accepts postfixed forms of the constants: '01...'b, '73...'o,
342 and 'a1...'z. An additional extension is the use of x for z. */
345 match_boz_constant (gfc_expr
**result
)
347 int radix
, length
, x_hex
, kind
;
348 locus old_loc
, start_loc
;
349 char *buffer
, post
, delim
;
352 start_loc
= old_loc
= gfc_current_locus
;
353 gfc_gobble_whitespace ();
356 switch (post
= gfc_next_ascii_char ())
378 radix
= 16; /* Set to accept any valid digit string. */
384 /* No whitespace allowed here. */
387 delim
= gfc_next_ascii_char ();
389 if (delim
!= '\'' && delim
!= '\"')
393 && (!gfc_notify_std(GFC_STD_GNU
, "Hexadecimal "
394 "constant at %C uses non-standard syntax")))
397 old_loc
= gfc_current_locus
;
399 length
= match_digits (0, radix
, NULL
);
402 gfc_error ("Empty set of digits in BOZ constant at %C");
406 if (gfc_next_ascii_char () != delim
)
408 gfc_error ("Illegal character in BOZ constant at %C");
414 switch (gfc_next_ascii_char ())
431 if (!gfc_notify_std (GFC_STD_GNU
, "BOZ constant "
432 "at %C uses non-standard postfix syntax"))
436 gfc_current_locus
= old_loc
;
438 buffer
= (char *) alloca (length
+ 1);
439 memset (buffer
, '\0', length
+ 1);
441 match_digits (0, radix
, buffer
);
442 gfc_next_ascii_char (); /* Eat delimiter. */
444 gfc_next_ascii_char (); /* Eat postfixed b, o, z, or x. */
446 /* In section 5.2.5 and following C567 in the Fortran 2003 standard, we find
447 "If a data-stmt-constant is a boz-literal-constant, the corresponding
448 variable shall be of type integer. The boz-literal-constant is treated
449 as if it were an int-literal-constant with a kind-param that specifies
450 the representation method with the largest decimal exponent range
451 supported by the processor." */
453 kind
= gfc_max_integer_kind
;
454 e
= gfc_convert_integer (buffer
, kind
, radix
, &gfc_current_locus
);
456 /* Mark as boz variable. */
459 if (gfc_range_check (e
) != ARITH_OK
)
461 gfc_error ("Integer too big for integer kind %i at %C", kind
);
466 if (!gfc_in_match_data ()
467 && (!gfc_notify_std(GFC_STD_F2003
, "BOZ used outside a DATA "
475 gfc_current_locus
= start_loc
;
480 /* Match a real constant of some sort. Allow a signed constant if signflag
484 match_real_constant (gfc_expr
**result
, int signflag
)
486 int kind
, count
, seen_dp
, seen_digits
, is_iso_c
;
487 locus old_loc
, temp_loc
;
488 char *p
, *buffer
, c
, exp_char
;
492 old_loc
= gfc_current_locus
;
493 gfc_gobble_whitespace ();
503 c
= gfc_next_ascii_char ();
504 if (signflag
&& (c
== '+' || c
== '-'))
509 gfc_gobble_whitespace ();
510 c
= gfc_next_ascii_char ();
513 /* Scan significand. */
514 for (;; c
= gfc_next_ascii_char (), count
++)
521 /* Check to see if "." goes with a following operator like
523 temp_loc
= gfc_current_locus
;
524 c
= gfc_next_ascii_char ();
526 if (c
== 'e' || c
== 'd' || c
== 'q')
528 c
= gfc_next_ascii_char ();
530 goto done
; /* Operator named .e. or .d. */
534 goto done
; /* Distinguish 1.e9 from 1.eq.2 */
536 gfc_current_locus
= temp_loc
;
550 if (!seen_digits
|| (c
!= 'e' && c
!= 'd' && c
!= 'q'))
557 if (!gfc_notify_std (GFC_STD_GNU
, "exponent-letter 'q' in "
558 "real-literal-constant at %C"))
560 else if (warn_real_q_constant
)
561 gfc_warning (OPT_Wreal_q_constant
,
562 "Extension: exponent-letter %<q%> in real-literal-constant "
567 c
= gfc_next_ascii_char ();
570 if (c
== '+' || c
== '-')
571 { /* optional sign */
572 c
= gfc_next_ascii_char ();
578 gfc_error ("Missing exponent in real number at %C");
584 c
= gfc_next_ascii_char ();
589 /* Check that we have a numeric constant. */
590 if (!seen_digits
|| (!seen_dp
&& exp_char
== ' '))
592 gfc_current_locus
= old_loc
;
596 /* Convert the number. */
597 gfc_current_locus
= old_loc
;
598 gfc_gobble_whitespace ();
600 buffer
= (char *) alloca (count
+ 1);
601 memset (buffer
, '\0', count
+ 1);
604 c
= gfc_next_ascii_char ();
605 if (c
== '+' || c
== '-')
607 gfc_gobble_whitespace ();
608 c
= gfc_next_ascii_char ();
611 /* Hack for mpfr_set_str(). */
614 if (c
== 'd' || c
== 'q')
622 c
= gfc_next_ascii_char ();
625 kind
= get_kind (&is_iso_c
);
634 gfc_error ("Real number at %C has a %<d%> exponent and an explicit "
638 kind
= gfc_default_double_kind
;
642 if (flag_real4_kind
== 8)
644 if (flag_real4_kind
== 10)
646 if (flag_real4_kind
== 16)
652 if (flag_real8_kind
== 4)
654 if (flag_real8_kind
== 10)
656 if (flag_real8_kind
== 16)
664 gfc_error ("Real number at %C has a %<q%> exponent and an explicit "
669 /* The maximum possible real kind type parameter is 16. First, try
670 that for the kind, then fallback to trying kind=10 (Intel 80 bit)
671 extended precision. If neither value works, just given up. */
673 if (gfc_validate_kind (BT_REAL
, kind
, true) < 0)
676 if (gfc_validate_kind (BT_REAL
, kind
, true) < 0)
678 gfc_error ("Invalid exponent-letter %<q%> in "
679 "real-literal-constant at %C");
687 kind
= gfc_default_real_kind
;
691 if (flag_real4_kind
== 8)
693 if (flag_real4_kind
== 10)
695 if (flag_real4_kind
== 16)
701 if (flag_real8_kind
== 4)
703 if (flag_real8_kind
== 10)
705 if (flag_real8_kind
== 16)
709 if (gfc_validate_kind (BT_REAL
, kind
, true) < 0)
711 gfc_error ("Invalid real kind %d at %C", kind
);
716 e
= gfc_convert_real (buffer
, kind
, &gfc_current_locus
);
718 mpfr_neg (e
->value
.real
, e
->value
.real
, GFC_RND_MODE
);
719 e
->ts
.is_c_interop
= is_iso_c
;
721 switch (gfc_range_check (e
))
726 gfc_error ("Real constant overflows its kind at %C");
729 case ARITH_UNDERFLOW
:
731 gfc_warning (OPT_Wunderflow
, "Real constant underflows its kind at %C");
732 mpfr_set_ui (e
->value
.real
, 0, GFC_RND_MODE
);
736 gfc_internal_error ("gfc_range_check() returned bad value");
739 /* Warn about trailing digits which suggest the user added too many
740 trailing digits, which may cause the appearance of higher pecision
741 than the kind kan support.
743 This is done by replacing the rightmost non-zero digit with zero
744 and comparing with the original value. If these are equal, we
745 assume the user supplied more digits than intended (or forgot to
746 convert to the correct kind).
749 if (warn_conversion_extra
)
755 c
= strchr (buffer
, 'e');
757 c
= buffer
+ strlen(buffer
);
760 for (p
= c
- 1; p
>= buffer
; p
--)
776 mpfr_set_str (r
, buffer
, 10, GFC_RND_MODE
);
778 mpfr_neg (r
, r
, GFC_RND_MODE
);
780 mpfr_sub (r
, r
, e
->value
.real
, GFC_RND_MODE
);
782 if (mpfr_cmp_ui (r
, 0) == 0)
783 gfc_warning (OPT_Wconversion_extra
, "Non-significant digits "
784 "in %qs number at %C, maybe incorrect KIND",
785 gfc_typename (&e
->ts
));
800 /* Match a substring reference. */
803 match_substring (gfc_charlen
*cl
, int init
, gfc_ref
**result
)
805 gfc_expr
*start
, *end
;
813 old_loc
= gfc_current_locus
;
815 m
= gfc_match_char ('(');
819 if (gfc_match_char (':') != MATCH_YES
)
822 m
= gfc_match_init_expr (&start
);
824 m
= gfc_match_expr (&start
);
832 m
= gfc_match_char (':');
837 if (gfc_match_char (')') != MATCH_YES
)
840 m
= gfc_match_init_expr (&end
);
842 m
= gfc_match_expr (&end
);
846 if (m
== MATCH_ERROR
)
849 m
= gfc_match_char (')');
854 /* Optimize away the (:) reference. */
855 if (start
== NULL
&& end
== NULL
)
859 ref
= gfc_get_ref ();
861 ref
->type
= REF_SUBSTRING
;
863 start
= gfc_get_int_expr (gfc_default_integer_kind
, NULL
, 1);
864 ref
->u
.ss
.start
= start
;
865 if (end
== NULL
&& cl
)
866 end
= gfc_copy_expr (cl
->length
);
868 ref
->u
.ss
.length
= cl
;
875 gfc_error ("Syntax error in SUBSTRING specification at %C");
879 gfc_free_expr (start
);
882 gfc_current_locus
= old_loc
;
887 /* Reads the next character of a string constant, taking care to
888 return doubled delimiters on the input as a single instance of
891 Special return values for "ret" argument are:
892 -1 End of the string, as determined by the delimiter
893 -2 Unterminated string detected
895 Backslash codes are also expanded at this time. */
898 next_string_char (gfc_char_t delimiter
, int *ret
)
903 c
= gfc_next_char_literal (INSTRING_WARN
);
912 if (flag_backslash
&& c
== '\\')
914 old_locus
= gfc_current_locus
;
916 if (gfc_match_special_char (&c
) == MATCH_NO
)
917 gfc_current_locus
= old_locus
;
919 if (!(gfc_option
.allow_std
& GFC_STD_GNU
) && !inhibit_warnings
)
920 gfc_warning (0, "Extension: backslash character at %C");
926 old_locus
= gfc_current_locus
;
927 c
= gfc_next_char_literal (NONSTRING
);
931 gfc_current_locus
= old_locus
;
938 /* Special case of gfc_match_name() that matches a parameter kind name
939 before a string constant. This takes case of the weird but legal
944 where kind____ is a parameter. gfc_match_name() will happily slurp
945 up all the underscores, which leads to problems. If we return
946 MATCH_YES, the parse pointer points to the final underscore, which
947 is not part of the name. We never return MATCH_ERROR-- errors in
948 the name will be detected later. */
951 match_charkind_name (char *name
)
957 gfc_gobble_whitespace ();
958 c
= gfc_next_ascii_char ();
967 old_loc
= gfc_current_locus
;
968 c
= gfc_next_ascii_char ();
972 peek
= gfc_peek_ascii_char ();
974 if (peek
== '\'' || peek
== '\"')
976 gfc_current_locus
= old_loc
;
984 && (c
!= '$' || !flag_dollar_ok
))
988 if (++len
> GFC_MAX_SYMBOL_LEN
)
996 /* See if the current input matches a character constant. Lots of
997 contortions have to be done to match the kind parameter which comes
998 before the actual string. The main consideration is that we don't
999 want to error out too quickly. For example, we don't actually do
1000 any validation of the kinds until we have actually seen a legal
1001 delimiter. Using match_kind_param() generates errors too quickly. */
1004 match_string_constant (gfc_expr
**result
)
1006 char name
[GFC_MAX_SYMBOL_LEN
+ 1], peek
;
1007 int i
, kind
, length
, save_warn_ampersand
, ret
;
1008 locus old_locus
, start_locus
;
1013 gfc_char_t c
, delimiter
, *p
;
1015 old_locus
= gfc_current_locus
;
1017 gfc_gobble_whitespace ();
1019 c
= gfc_next_char ();
1020 if (c
== '\'' || c
== '"')
1022 kind
= gfc_default_character_kind
;
1023 start_locus
= gfc_current_locus
;
1027 if (gfc_wide_is_digit (c
))
1031 while (gfc_wide_is_digit (c
))
1033 kind
= kind
* 10 + c
- '0';
1036 c
= gfc_next_char ();
1042 gfc_current_locus
= old_locus
;
1044 m
= match_charkind_name (name
);
1048 if (gfc_find_symbol (name
, NULL
, 1, &sym
)
1050 || sym
->attr
.flavor
!= FL_PARAMETER
)
1054 c
= gfc_next_char ();
1059 gfc_gobble_whitespace ();
1060 c
= gfc_next_char ();
1066 gfc_gobble_whitespace ();
1068 c
= gfc_next_char ();
1069 if (c
!= '\'' && c
!= '"')
1072 start_locus
= gfc_current_locus
;
1076 q
= gfc_extract_int (sym
->value
, &kind
);
1082 gfc_set_sym_referenced (sym
);
1085 if (gfc_validate_kind (BT_CHARACTER
, kind
, true) < 0)
1087 gfc_error ("Invalid kind %d for CHARACTER constant at %C", kind
);
1092 /* Scan the string into a block of memory by first figuring out how
1093 long it is, allocating the structure, then re-reading it. This
1094 isn't particularly efficient, but string constants aren't that
1095 common in most code. TODO: Use obstacks? */
1102 c
= next_string_char (delimiter
, &ret
);
1107 gfc_current_locus
= start_locus
;
1108 gfc_error ("Unterminated character constant beginning at %C");
1115 /* Peek at the next character to see if it is a b, o, z, or x for the
1116 postfixed BOZ literal constants. */
1117 peek
= gfc_peek_ascii_char ();
1118 if (peek
== 'b' || peek
== 'o' || peek
=='z' || peek
== 'x')
1121 e
= gfc_get_character_expr (kind
, &start_locus
, NULL
, length
);
1123 gfc_current_locus
= start_locus
;
1125 /* We disable the warning for the following loop as the warning has already
1126 been printed in the loop above. */
1127 save_warn_ampersand
= warn_ampersand
;
1128 warn_ampersand
= false;
1130 p
= e
->value
.character
.string
;
1131 for (i
= 0; i
< length
; i
++)
1133 c
= next_string_char (delimiter
, &ret
);
1135 if (!gfc_check_character_range (c
, kind
))
1138 gfc_error ("Character %qs in string at %C is not representable "
1139 "in character kind %d", gfc_print_wide_char (c
), kind
);
1146 *p
= '\0'; /* TODO: C-style string is for development/debug purposes. */
1147 warn_ampersand
= save_warn_ampersand
;
1149 next_string_char (delimiter
, &ret
);
1151 gfc_internal_error ("match_string_constant(): Delimiter not found");
1153 if (match_substring (NULL
, 0, &e
->ref
) != MATCH_NO
)
1154 e
->expr_type
= EXPR_SUBSTRING
;
1161 gfc_current_locus
= old_locus
;
1166 /* Match a .true. or .false. Returns 1 if a .true. was found,
1167 0 if a .false. was found, and -1 otherwise. */
1169 match_logical_constant_string (void)
1171 locus orig_loc
= gfc_current_locus
;
1173 gfc_gobble_whitespace ();
1174 if (gfc_next_ascii_char () == '.')
1176 char ch
= gfc_next_ascii_char ();
1179 if (gfc_next_ascii_char () == 'a'
1180 && gfc_next_ascii_char () == 'l'
1181 && gfc_next_ascii_char () == 's'
1182 && gfc_next_ascii_char () == 'e'
1183 && gfc_next_ascii_char () == '.')
1184 /* Matched ".false.". */
1189 if (gfc_next_ascii_char () == 'r'
1190 && gfc_next_ascii_char () == 'u'
1191 && gfc_next_ascii_char () == 'e'
1192 && gfc_next_ascii_char () == '.')
1193 /* Matched ".true.". */
1197 gfc_current_locus
= orig_loc
;
1201 /* Match a .true. or .false. */
1204 match_logical_constant (gfc_expr
**result
)
1207 int i
, kind
, is_iso_c
;
1209 i
= match_logical_constant_string ();
1213 kind
= get_kind (&is_iso_c
);
1217 kind
= gfc_default_logical_kind
;
1219 if (gfc_validate_kind (BT_LOGICAL
, kind
, true) < 0)
1221 gfc_error ("Bad kind for logical constant at %C");
1225 e
= gfc_get_logical_expr (kind
, &gfc_current_locus
, i
);
1226 e
->ts
.is_c_interop
= is_iso_c
;
1233 /* Match a real or imaginary part of a complex constant that is a
1234 symbolic constant. */
1237 match_sym_complex_part (gfc_expr
**result
)
1239 char name
[GFC_MAX_SYMBOL_LEN
+ 1];
1244 m
= gfc_match_name (name
);
1248 if (gfc_find_symbol (name
, NULL
, 1, &sym
) || sym
== NULL
)
1251 if (sym
->attr
.flavor
!= FL_PARAMETER
)
1253 gfc_error ("Expected PARAMETER symbol in complex constant at %C");
1260 if (!gfc_numeric_ts (&sym
->value
->ts
))
1262 gfc_error ("Numeric PARAMETER required in complex constant at %C");
1266 if (sym
->value
->rank
!= 0)
1268 gfc_error ("Scalar PARAMETER required in complex constant at %C");
1272 if (!gfc_notify_std (GFC_STD_F2003
, "PARAMETER symbol in "
1273 "complex constant at %C"))
1276 switch (sym
->value
->ts
.type
)
1279 e
= gfc_copy_expr (sym
->value
);
1283 e
= gfc_complex2real (sym
->value
, sym
->value
->ts
.kind
);
1289 e
= gfc_int2real (sym
->value
, gfc_default_real_kind
);
1295 gfc_internal_error ("gfc_match_sym_complex_part(): Bad type");
1298 *result
= e
; /* e is a scalar, real, constant expression. */
1302 gfc_error ("Error converting PARAMETER constant in complex constant at %C");
1307 /* Match a real or imaginary part of a complex number. */
1310 match_complex_part (gfc_expr
**result
)
1314 m
= match_sym_complex_part (result
);
1318 m
= match_real_constant (result
, 1);
1322 return match_integer_constant (result
, 1);
1326 /* Try to match a complex constant. */
1329 match_complex_constant (gfc_expr
**result
)
1331 gfc_expr
*e
, *real
, *imag
;
1332 gfc_error_buffer old_error
;
1333 gfc_typespec target
;
1338 old_loc
= gfc_current_locus
;
1339 real
= imag
= e
= NULL
;
1341 m
= gfc_match_char ('(');
1345 gfc_push_error (&old_error
);
1347 m
= match_complex_part (&real
);
1350 gfc_free_error (&old_error
);
1354 if (gfc_match_char (',') == MATCH_NO
)
1356 gfc_pop_error (&old_error
);
1361 /* If m is error, then something was wrong with the real part and we
1362 assume we have a complex constant because we've seen the ','. An
1363 ambiguous case here is the start of an iterator list of some
1364 sort. These sort of lists are matched prior to coming here. */
1366 if (m
== MATCH_ERROR
)
1368 gfc_free_error (&old_error
);
1371 gfc_pop_error (&old_error
);
1373 m
= match_complex_part (&imag
);
1376 if (m
== MATCH_ERROR
)
1379 m
= gfc_match_char (')');
1382 /* Give the matcher for implied do-loops a chance to run. This
1383 yields a much saner error message for (/ (i, 4=i, 6) /). */
1384 if (gfc_peek_ascii_char () == '=')
1393 if (m
== MATCH_ERROR
)
1396 /* Decide on the kind of this complex number. */
1397 if (real
->ts
.type
== BT_REAL
)
1399 if (imag
->ts
.type
== BT_REAL
)
1400 kind
= gfc_kind_max (real
, imag
);
1402 kind
= real
->ts
.kind
;
1406 if (imag
->ts
.type
== BT_REAL
)
1407 kind
= imag
->ts
.kind
;
1409 kind
= gfc_default_real_kind
;
1411 gfc_clear_ts (&target
);
1412 target
.type
= BT_REAL
;
1415 if (real
->ts
.type
!= BT_REAL
|| kind
!= real
->ts
.kind
)
1416 gfc_convert_type (real
, &target
, 2);
1417 if (imag
->ts
.type
!= BT_REAL
|| kind
!= imag
->ts
.kind
)
1418 gfc_convert_type (imag
, &target
, 2);
1420 e
= gfc_convert_complex (real
, imag
, kind
);
1421 e
->where
= gfc_current_locus
;
1423 gfc_free_expr (real
);
1424 gfc_free_expr (imag
);
1430 gfc_error ("Syntax error in COMPLEX constant at %C");
1435 gfc_free_expr (real
);
1436 gfc_free_expr (imag
);
1437 gfc_current_locus
= old_loc
;
1443 /* Match constants in any of several forms. Returns nonzero for a
1444 match, zero for no match. */
1447 gfc_match_literal_constant (gfc_expr
**result
, int signflag
)
1451 m
= match_complex_constant (result
);
1455 m
= match_string_constant (result
);
1459 m
= match_boz_constant (result
);
1463 m
= match_real_constant (result
, signflag
);
1467 m
= match_hollerith_constant (result
);
1471 m
= match_integer_constant (result
, signflag
);
1475 m
= match_logical_constant (result
);
1483 /* This checks if a symbol is the return value of an encompassing function.
1484 Function nesting can be maximally two levels deep, but we may have
1485 additional local namespaces like BLOCK etc. */
1488 gfc_is_function_return_value (gfc_symbol
*sym
, gfc_namespace
*ns
)
1490 if (!sym
->attr
.function
|| (sym
->result
!= sym
))
1494 if (ns
->proc_name
== sym
)
1502 /* Match a single actual argument value. An actual argument is
1503 usually an expression, but can also be a procedure name. If the
1504 argument is a single name, it is not always possible to tell
1505 whether the name is a dummy procedure or not. We treat these cases
1506 by creating an argument that looks like a dummy procedure and
1507 fixing things later during resolution. */
1510 match_actual_arg (gfc_expr
**result
)
1512 char name
[GFC_MAX_SYMBOL_LEN
+ 1];
1513 gfc_symtree
*symtree
;
1518 gfc_gobble_whitespace ();
1519 where
= gfc_current_locus
;
1521 switch (gfc_match_name (name
))
1530 w
= gfc_current_locus
;
1531 gfc_gobble_whitespace ();
1532 c
= gfc_next_ascii_char ();
1533 gfc_current_locus
= w
;
1535 if (c
!= ',' && c
!= ')')
1538 if (gfc_find_sym_tree (name
, NULL
, 1, &symtree
))
1540 /* Handle error elsewhere. */
1542 /* Eliminate a couple of common cases where we know we don't
1543 have a function argument. */
1544 if (symtree
== NULL
)
1546 gfc_get_sym_tree (name
, NULL
, &symtree
, false);
1547 gfc_set_sym_referenced (symtree
->n
.sym
);
1553 sym
= symtree
->n
.sym
;
1554 gfc_set_sym_referenced (sym
);
1555 if (sym
->attr
.flavor
!= FL_PROCEDURE
1556 && sym
->attr
.flavor
!= FL_UNKNOWN
)
1559 if (sym
->attr
.in_common
&& !sym
->attr
.proc_pointer
)
1561 if (!gfc_add_flavor (&sym
->attr
, FL_VARIABLE
,
1562 sym
->name
, &sym
->declared_at
))
1567 /* If the symbol is a function with itself as the result and
1568 is being defined, then we have a variable. */
1569 if (sym
->attr
.function
&& sym
->result
== sym
)
1571 if (gfc_is_function_return_value (sym
, gfc_current_ns
))
1575 && (sym
->ns
== gfc_current_ns
1576 || sym
->ns
== gfc_current_ns
->parent
))
1578 gfc_entry_list
*el
= NULL
;
1580 for (el
= sym
->ns
->entries
; el
; el
= el
->next
)
1590 e
= gfc_get_expr (); /* Leave it unknown for now */
1591 e
->symtree
= symtree
;
1592 e
->expr_type
= EXPR_VARIABLE
;
1593 e
->ts
.type
= BT_PROCEDURE
;
1600 gfc_current_locus
= where
;
1601 return gfc_match_expr (result
);
1605 /* Match a keyword argument. */
1608 match_keyword_arg (gfc_actual_arglist
*actual
, gfc_actual_arglist
*base
)
1610 char name
[GFC_MAX_SYMBOL_LEN
+ 1];
1611 gfc_actual_arglist
*a
;
1615 name_locus
= gfc_current_locus
;
1616 m
= gfc_match_name (name
);
1620 if (gfc_match_char ('=') != MATCH_YES
)
1626 m
= match_actual_arg (&actual
->expr
);
1630 /* Make sure this name has not appeared yet. */
1632 if (name
[0] != '\0')
1634 for (a
= base
; a
; a
= a
->next
)
1635 if (a
->name
!= NULL
&& strcmp (a
->name
, name
) == 0)
1637 gfc_error ("Keyword %qs at %C has already appeared in the "
1638 "current argument list", name
);
1643 actual
->name
= gfc_get_string (name
);
1647 gfc_current_locus
= name_locus
;
1652 /* Match an argument list function, such as %VAL. */
1655 match_arg_list_function (gfc_actual_arglist
*result
)
1657 char name
[GFC_MAX_SYMBOL_LEN
+ 1];
1661 old_locus
= gfc_current_locus
;
1663 if (gfc_match_char ('%') != MATCH_YES
)
1669 m
= gfc_match ("%n (", name
);
1673 if (name
[0] != '\0')
1678 if (strncmp (name
, "loc", 3) == 0)
1680 result
->name
= "%LOC";
1684 if (strncmp (name
, "ref", 3) == 0)
1686 result
->name
= "%REF";
1690 if (strncmp (name
, "val", 3) == 0)
1692 result
->name
= "%VAL";
1701 if (!gfc_notify_std (GFC_STD_GNU
, "argument list function at %C"))
1707 m
= match_actual_arg (&result
->expr
);
1711 if (gfc_match_char (')') != MATCH_YES
)
1720 gfc_current_locus
= old_locus
;
1725 /* Matches an actual argument list of a function or subroutine, from
1726 the opening parenthesis to the closing parenthesis. The argument
1727 list is assumed to allow keyword arguments because we don't know if
1728 the symbol associated with the procedure has an implicit interface
1729 or not. We make sure keywords are unique. If sub_flag is set,
1730 we're matching the argument list of a subroutine. */
1733 gfc_match_actual_arglist (int sub_flag
, gfc_actual_arglist
**argp
)
1735 gfc_actual_arglist
*head
, *tail
;
1737 gfc_st_label
*label
;
1741 *argp
= tail
= NULL
;
1742 old_loc
= gfc_current_locus
;
1746 if (gfc_match_char ('(') == MATCH_NO
)
1747 return (sub_flag
) ? MATCH_YES
: MATCH_NO
;
1749 if (gfc_match_char (')') == MATCH_YES
)
1753 matching_actual_arglist
++;
1758 head
= tail
= gfc_get_actual_arglist ();
1761 tail
->next
= gfc_get_actual_arglist ();
1765 if (sub_flag
&& gfc_match_char ('*') == MATCH_YES
)
1767 m
= gfc_match_st_label (&label
);
1769 gfc_error ("Expected alternate return label at %C");
1773 if (!gfc_notify_std (GFC_STD_F95_OBS
, "Alternate-return argument "
1777 tail
->label
= label
;
1781 /* After the first keyword argument is seen, the following
1782 arguments must also have keywords. */
1785 m
= match_keyword_arg (tail
, head
);
1787 if (m
== MATCH_ERROR
)
1791 gfc_error ("Missing keyword name in actual argument list at %C");
1798 /* Try an argument list function, like %VAL. */
1799 m
= match_arg_list_function (tail
);
1800 if (m
== MATCH_ERROR
)
1803 /* See if we have the first keyword argument. */
1806 m
= match_keyword_arg (tail
, head
);
1809 if (m
== MATCH_ERROR
)
1815 /* Try for a non-keyword argument. */
1816 m
= match_actual_arg (&tail
->expr
);
1817 if (m
== MATCH_ERROR
)
1826 if (gfc_match_char (')') == MATCH_YES
)
1828 if (gfc_match_char (',') != MATCH_YES
)
1833 matching_actual_arglist
--;
1837 gfc_error ("Syntax error in argument list at %C");
1840 gfc_free_actual_arglist (head
);
1841 gfc_current_locus
= old_loc
;
1842 matching_actual_arglist
--;
1847 /* Used by gfc_match_varspec() to extend the reference list by one
1851 extend_ref (gfc_expr
*primary
, gfc_ref
*tail
)
1853 if (primary
->ref
== NULL
)
1854 primary
->ref
= tail
= gfc_get_ref ();
1858 gfc_internal_error ("extend_ref(): Bad tail");
1859 tail
->next
= gfc_get_ref ();
1867 /* Match any additional specifications associated with the current
1868 variable like member references or substrings. If equiv_flag is
1869 set we only match stuff that is allowed inside an EQUIVALENCE
1870 statement. sub_flag tells whether we expect a type-bound procedure found
1871 to be a subroutine as part of CALL or a FUNCTION. For procedure pointer
1872 components, 'ppc_arg' determines whether the PPC may be called (with an
1873 argument list), or whether it may just be referred to as a pointer. */
1876 gfc_match_varspec (gfc_expr
*primary
, int equiv_flag
, bool sub_flag
,
1879 char name
[GFC_MAX_SYMBOL_LEN
+ 1];
1880 gfc_ref
*substring
, *tail
;
1881 gfc_component
*component
;
1882 gfc_symbol
*sym
= primary
->symtree
->n
.sym
;
1888 gfc_gobble_whitespace ();
1890 if (gfc_peek_ascii_char () == '[')
1892 if ((sym
->ts
.type
!= BT_CLASS
&& sym
->attr
.dimension
)
1893 || (sym
->ts
.type
== BT_CLASS
&& CLASS_DATA (sym
)
1894 && CLASS_DATA (sym
)->attr
.dimension
))
1896 gfc_error ("Array section designator, e.g. '(:)', is required "
1897 "besides the coarray designator '[...]' at %C");
1900 if ((sym
->ts
.type
!= BT_CLASS
&& !sym
->attr
.codimension
)
1901 || (sym
->ts
.type
== BT_CLASS
&& CLASS_DATA (sym
)
1902 && !CLASS_DATA (sym
)->attr
.codimension
))
1904 gfc_error ("Coarray designator at %C but %qs is not a coarray",
1910 /* For associate names, we may not yet know whether they are arrays or not.
1911 Thus if we have one and parentheses follow, we have to assume that it
1912 actually is one for now. The final decision will be made at
1913 resolution time, of course. */
1914 if (sym
->assoc
&& gfc_peek_ascii_char () == '('
1915 && !(sym
->assoc
->dangling
&& sym
->assoc
->st
1916 && sym
->assoc
->st
->n
.sym
1917 && sym
->assoc
->st
->n
.sym
->attr
.dimension
== 0)
1918 && sym
->ts
.type
!= BT_CLASS
)
1919 sym
->attr
.dimension
= 1;
1921 if ((equiv_flag
&& gfc_peek_ascii_char () == '(')
1922 || gfc_peek_ascii_char () == '[' || sym
->attr
.codimension
1923 || (sym
->attr
.dimension
&& sym
->ts
.type
!= BT_CLASS
1924 && !sym
->attr
.proc_pointer
&& !gfc_is_proc_ptr_comp (primary
)
1925 && !(gfc_matching_procptr_assignment
1926 && sym
->attr
.flavor
== FL_PROCEDURE
))
1927 || (sym
->ts
.type
== BT_CLASS
&& sym
->attr
.class_ok
1928 && (CLASS_DATA (sym
)->attr
.dimension
1929 || CLASS_DATA (sym
)->attr
.codimension
)))
1933 tail
= extend_ref (primary
, tail
);
1934 tail
->type
= REF_ARRAY
;
1936 /* In EQUIVALENCE, we don't know yet whether we are seeing
1937 an array, character variable or array of character
1938 variables. We'll leave the decision till resolve time. */
1942 else if (sym
->ts
.type
== BT_CLASS
&& CLASS_DATA (sym
))
1943 as
= CLASS_DATA (sym
)->as
;
1947 m
= gfc_match_array_ref (&tail
->u
.ar
, as
, equiv_flag
,
1948 as
? as
->corank
: 0);
1952 gfc_gobble_whitespace ();
1953 if (equiv_flag
&& gfc_peek_ascii_char () == '(')
1955 tail
= extend_ref (primary
, tail
);
1956 tail
->type
= REF_ARRAY
;
1958 m
= gfc_match_array_ref (&tail
->u
.ar
, NULL
, equiv_flag
, 0);
1964 primary
->ts
= sym
->ts
;
1969 if (sym
->ts
.type
== BT_UNKNOWN
&& gfc_peek_ascii_char () == '%'
1970 && gfc_get_default_type (sym
->name
, sym
->ns
)->type
== BT_DERIVED
)
1971 gfc_set_default_type (sym
, 0, sym
->ns
);
1973 if (sym
->ts
.type
== BT_UNKNOWN
&& gfc_match_char ('%') == MATCH_YES
)
1975 gfc_error ("Symbol %qs at %C has no IMPLICIT type", sym
->name
);
1978 else if ((sym
->ts
.type
!= BT_DERIVED
&& sym
->ts
.type
!= BT_CLASS
)
1979 && gfc_match_char ('%') == MATCH_YES
)
1981 gfc_error ("Unexpected %<%%%> for nonderived-type variable %qs at %C",
1986 if ((sym
->ts
.type
!= BT_DERIVED
&& sym
->ts
.type
!= BT_CLASS
)
1987 || gfc_match_char ('%') != MATCH_YES
)
1988 goto check_substring
;
1990 sym
= sym
->ts
.u
.derived
;
1997 m
= gfc_match_name (name
);
1999 gfc_error ("Expected structure component name at %C");
2003 if (sym
->f2k_derived
)
2004 tbp
= gfc_find_typebound_proc (sym
, &t
, name
, false, &gfc_current_locus
);
2010 gfc_symbol
* tbp_sym
;
2015 gcc_assert (!tail
|| !tail
->next
);
2017 if (!(primary
->expr_type
== EXPR_VARIABLE
2018 || (primary
->expr_type
== EXPR_STRUCTURE
2019 && primary
->symtree
&& primary
->symtree
->n
.sym
2020 && primary
->symtree
->n
.sym
->attr
.flavor
)))
2023 if (tbp
->n
.tb
->is_generic
)
2026 tbp_sym
= tbp
->n
.tb
->u
.specific
->n
.sym
;
2028 primary
->expr_type
= EXPR_COMPCALL
;
2029 primary
->value
.compcall
.tbp
= tbp
->n
.tb
;
2030 primary
->value
.compcall
.name
= tbp
->name
;
2031 primary
->value
.compcall
.ignore_pass
= 0;
2032 primary
->value
.compcall
.assign
= 0;
2033 primary
->value
.compcall
.base_object
= NULL
;
2034 gcc_assert (primary
->symtree
->n
.sym
->attr
.referenced
);
2036 primary
->ts
= tbp_sym
->ts
;
2038 gfc_clear_ts (&primary
->ts
);
2040 m
= gfc_match_actual_arglist (tbp
->n
.tb
->subroutine
,
2041 &primary
->value
.compcall
.actual
);
2042 if (m
== MATCH_ERROR
)
2047 primary
->value
.compcall
.actual
= NULL
;
2050 gfc_error ("Expected argument list at %C");
2058 component
= gfc_find_component (sym
, name
, false, false);
2059 if (component
== NULL
)
2062 tail
= extend_ref (primary
, tail
);
2063 tail
->type
= REF_COMPONENT
;
2065 tail
->u
.c
.component
= component
;
2066 tail
->u
.c
.sym
= sym
;
2068 primary
->ts
= component
->ts
;
2070 if (component
->attr
.proc_pointer
&& ppc_arg
)
2072 /* Procedure pointer component call: Look for argument list. */
2073 m
= gfc_match_actual_arglist (sub_flag
,
2074 &primary
->value
.compcall
.actual
);
2075 if (m
== MATCH_ERROR
)
2078 if (m
== MATCH_NO
&& !gfc_matching_ptr_assignment
2079 && !gfc_matching_procptr_assignment
&& !matching_actual_arglist
)
2081 gfc_error ("Procedure pointer component %qs requires an "
2082 "argument list at %C", component
->name
);
2087 primary
->expr_type
= EXPR_PPC
;
2092 if (component
->as
!= NULL
&& !component
->attr
.proc_pointer
)
2094 tail
= extend_ref (primary
, tail
);
2095 tail
->type
= REF_ARRAY
;
2097 m
= gfc_match_array_ref (&tail
->u
.ar
, component
->as
, equiv_flag
,
2098 component
->as
->corank
);
2102 else if (component
->ts
.type
== BT_CLASS
&& component
->attr
.class_ok
2103 && CLASS_DATA (component
)->as
&& !component
->attr
.proc_pointer
)
2105 tail
= extend_ref (primary
, tail
);
2106 tail
->type
= REF_ARRAY
;
2108 m
= gfc_match_array_ref (&tail
->u
.ar
, CLASS_DATA (component
)->as
,
2110 CLASS_DATA (component
)->as
->corank
);
2115 if ((component
->ts
.type
!= BT_DERIVED
&& component
->ts
.type
!= BT_CLASS
)
2116 || gfc_match_char ('%') != MATCH_YES
)
2119 sym
= component
->ts
.u
.derived
;
2124 if (primary
->ts
.type
== BT_UNKNOWN
&& sym
->attr
.flavor
!= FL_DERIVED
)
2126 if (gfc_get_default_type (sym
->name
, sym
->ns
)->type
== BT_CHARACTER
)
2128 gfc_set_default_type (sym
, 0, sym
->ns
);
2129 primary
->ts
= sym
->ts
;
2134 if (primary
->ts
.type
== BT_CHARACTER
)
2136 switch (match_substring (primary
->ts
.u
.cl
, equiv_flag
, &substring
))
2140 primary
->ref
= substring
;
2142 tail
->next
= substring
;
2144 if (primary
->expr_type
== EXPR_CONSTANT
)
2145 primary
->expr_type
= EXPR_SUBSTRING
;
2148 primary
->ts
.u
.cl
= NULL
;
2155 gfc_clear_ts (&primary
->ts
);
2156 gfc_clear_ts (&sym
->ts
);
2166 if (primary
->expr_type
== EXPR_PPC
&& gfc_is_coindexed (primary
))
2168 gfc_error ("Coindexed procedure-pointer component at %C");
2176 /* Given an expression that is a variable, figure out what the
2177 ultimate variable's type and attribute is, traversing the reference
2178 structures if necessary.
2180 This subroutine is trickier than it looks. We start at the base
2181 symbol and store the attribute. Component references load a
2182 completely new attribute.
2184 A couple of rules come into play. Subobjects of targets are always
2185 targets themselves. If we see a component that goes through a
2186 pointer, then the expression must also be a target, since the
2187 pointer is associated with something (if it isn't core will soon be
2188 dumped). If we see a full part or section of an array, the
2189 expression is also an array.
2191 We can have at most one full array reference. */
2194 gfc_variable_attr (gfc_expr
*expr
, gfc_typespec
*ts
)
2196 int dimension
, codimension
, pointer
, allocatable
, target
, n
;
2197 symbol_attribute attr
;
2200 gfc_component
*comp
;
2202 if (expr
->expr_type
!= EXPR_VARIABLE
&& expr
->expr_type
!= EXPR_FUNCTION
)
2203 gfc_internal_error ("gfc_variable_attr(): Expression isn't a variable");
2205 sym
= expr
->symtree
->n
.sym
;
2208 if (sym
->ts
.type
== BT_CLASS
&& sym
->attr
.class_ok
)
2210 dimension
= CLASS_DATA (sym
)->attr
.dimension
;
2211 codimension
= CLASS_DATA (sym
)->attr
.codimension
;
2212 pointer
= CLASS_DATA (sym
)->attr
.class_pointer
;
2213 allocatable
= CLASS_DATA (sym
)->attr
.allocatable
;
2217 dimension
= attr
.dimension
;
2218 codimension
= attr
.codimension
;
2219 pointer
= attr
.pointer
;
2220 allocatable
= attr
.allocatable
;
2223 target
= attr
.target
;
2224 if (pointer
|| attr
.proc_pointer
)
2227 if (ts
!= NULL
&& expr
->ts
.type
== BT_UNKNOWN
)
2230 for (ref
= expr
->ref
; ref
; ref
= ref
->next
)
2235 switch (ref
->u
.ar
.type
)
2242 allocatable
= pointer
= 0;
2247 /* Handle coarrays. */
2248 if (ref
->u
.ar
.dimen
> 0)
2249 allocatable
= pointer
= 0;
2253 /* If any of start, end or stride is not integer, there will
2254 already have been an error issued. */
2255 for (n
= 0; n
< ref
->u
.ar
.as
->rank
; n
++)
2258 gfc_get_errors (NULL
, &errors
);
2259 if (((ref
->u
.ar
.start
[n
]
2260 && ref
->u
.ar
.start
[n
]->ts
.type
== BT_UNKNOWN
)
2263 && ref
->u
.ar
.end
[n
]->ts
.type
== BT_UNKNOWN
)
2265 (ref
->u
.ar
.stride
[n
]
2266 && ref
->u
.ar
.stride
[n
]->ts
.type
== BT_UNKNOWN
))
2270 if (n
== ref
->u
.ar
.as
->rank
)
2271 gfc_internal_error ("gfc_variable_attr(): Bad array reference");
2277 comp
= ref
->u
.c
.component
;
2282 /* Don't set the string length if a substring reference
2284 if (ts
->type
== BT_CHARACTER
2285 && ref
->next
&& ref
->next
->type
== REF_SUBSTRING
)
2289 if (comp
->ts
.type
== BT_CLASS
)
2291 codimension
= CLASS_DATA (comp
)->attr
.codimension
;
2292 pointer
= CLASS_DATA (comp
)->attr
.class_pointer
;
2293 allocatable
= CLASS_DATA (comp
)->attr
.allocatable
;
2297 codimension
= comp
->attr
.codimension
;
2298 pointer
= comp
->attr
.pointer
;
2299 allocatable
= comp
->attr
.allocatable
;
2301 if (pointer
|| attr
.proc_pointer
)
2307 allocatable
= pointer
= 0;
2311 attr
.dimension
= dimension
;
2312 attr
.codimension
= codimension
;
2313 attr
.pointer
= pointer
;
2314 attr
.allocatable
= allocatable
;
2315 attr
.target
= target
;
2316 attr
.save
= sym
->attr
.save
;
2322 /* Return the attribute from a general expression. */
2325 gfc_expr_attr (gfc_expr
*e
)
2327 symbol_attribute attr
;
2329 switch (e
->expr_type
)
2332 attr
= gfc_variable_attr (e
, NULL
);
2336 gfc_clear_attr (&attr
);
2338 if (e
->value
.function
.esym
&& e
->value
.function
.esym
->result
)
2340 gfc_symbol
*sym
= e
->value
.function
.esym
->result
;
2342 if (sym
->ts
.type
== BT_CLASS
)
2344 attr
.dimension
= CLASS_DATA (sym
)->attr
.dimension
;
2345 attr
.pointer
= CLASS_DATA (sym
)->attr
.class_pointer
;
2346 attr
.allocatable
= CLASS_DATA (sym
)->attr
.allocatable
;
2350 attr
= gfc_variable_attr (e
, NULL
);
2352 /* TODO: NULL() returns pointers. May have to take care of this
2358 gfc_clear_attr (&attr
);
2366 /* Match a structure constructor. The initial symbol has already been
2369 typedef struct gfc_structure_ctor_component
2374 struct gfc_structure_ctor_component
* next
;
2376 gfc_structure_ctor_component
;
2378 #define gfc_get_structure_ctor_component() XCNEW (gfc_structure_ctor_component)
2381 gfc_free_structure_ctor_component (gfc_structure_ctor_component
*comp
)
2384 gfc_free_expr (comp
->val
);
2389 /* Translate the component list into the actual constructor by sorting it in
2390 the order required; this also checks along the way that each and every
2391 component actually has an initializer and handles default initializers
2392 for components without explicit value given. */
2394 build_actual_constructor (gfc_structure_ctor_component
**comp_head
,
2395 gfc_constructor_base
*ctor_head
, gfc_symbol
*sym
)
2397 gfc_structure_ctor_component
*comp_iter
;
2398 gfc_component
*comp
;
2400 for (comp
= sym
->components
; comp
; comp
= comp
->next
)
2402 gfc_structure_ctor_component
**next_ptr
;
2403 gfc_expr
*value
= NULL
;
2405 /* Try to find the initializer for the current component by name. */
2406 next_ptr
= comp_head
;
2407 for (comp_iter
= *comp_head
; comp_iter
; comp_iter
= comp_iter
->next
)
2409 if (!strcmp (comp_iter
->name
, comp
->name
))
2411 next_ptr
= &comp_iter
->next
;
2414 /* If an extension, try building the parent derived type by building
2415 a value expression for the parent derived type and calling self. */
2416 if (!comp_iter
&& comp
== sym
->components
&& sym
->attr
.extension
)
2418 value
= gfc_get_structure_constructor_expr (comp
->ts
.type
,
2420 &gfc_current_locus
);
2421 value
->ts
= comp
->ts
;
2423 if (!build_actual_constructor (comp_head
,
2424 &value
->value
.constructor
,
2425 comp
->ts
.u
.derived
))
2427 gfc_free_expr (value
);
2431 gfc_constructor_append_expr (ctor_head
, value
, NULL
);
2435 /* If it was not found, try the default initializer if there's any;
2436 otherwise, it's an error unless this is a deferred parameter. */
2439 if (comp
->initializer
)
2441 if (!gfc_notify_std (GFC_STD_F2003
, "Structure constructor "
2442 "with missing optional arguments at %C"))
2444 value
= gfc_copy_expr (comp
->initializer
);
2446 else if (comp
->attr
.allocatable
2447 || (comp
->ts
.type
== BT_CLASS
2448 && CLASS_DATA (comp
)->attr
.allocatable
))
2450 if (!gfc_notify_std (GFC_STD_F2008
, "No initializer for "
2451 "allocatable component '%qs' given in the "
2452 "structure constructor at %C", comp
->name
))
2455 else if (!comp
->attr
.artificial
)
2457 gfc_error ("No initializer for component %qs given in the"
2458 " structure constructor at %C!", comp
->name
);
2463 value
= comp_iter
->val
;
2465 /* Add the value to the constructor chain built. */
2466 gfc_constructor_append_expr (ctor_head
, value
, NULL
);
2468 /* Remove the entry from the component list. We don't want the expression
2469 value to be free'd, so set it to NULL. */
2472 *next_ptr
= comp_iter
->next
;
2473 comp_iter
->val
= NULL
;
2474 gfc_free_structure_ctor_component (comp_iter
);
2482 gfc_convert_to_structure_constructor (gfc_expr
*e
, gfc_symbol
*sym
, gfc_expr
**cexpr
,
2483 gfc_actual_arglist
**arglist
,
2486 gfc_actual_arglist
*actual
;
2487 gfc_structure_ctor_component
*comp_tail
, *comp_head
, *comp_iter
;
2488 gfc_constructor_base ctor_head
= NULL
;
2489 gfc_component
*comp
; /* Is set NULL when named component is first seen */
2490 const char* last_name
= NULL
;
2494 expr
= parent
? *cexpr
: e
;
2495 old_locus
= gfc_current_locus
;
2497 ; /* gfc_current_locus = *arglist->expr ? ->where;*/
2499 gfc_current_locus
= expr
->where
;
2501 comp_tail
= comp_head
= NULL
;
2503 if (!parent
&& sym
->attr
.abstract
)
2505 gfc_error ("Can't construct ABSTRACT type %qs at %L",
2506 sym
->name
, &expr
->where
);
2510 comp
= sym
->components
;
2511 actual
= parent
? *arglist
: expr
->value
.function
.actual
;
2514 gfc_component
*this_comp
= NULL
;
2517 comp_tail
= comp_head
= gfc_get_structure_ctor_component ();
2520 comp_tail
->next
= gfc_get_structure_ctor_component ();
2521 comp_tail
= comp_tail
->next
;
2525 if (!gfc_notify_std (GFC_STD_F2003
, "Structure"
2526 " constructor with named arguments at %C"))
2529 comp_tail
->name
= xstrdup (actual
->name
);
2530 last_name
= comp_tail
->name
;
2535 /* Components without name are not allowed after the first named
2536 component initializer! */
2537 if (!comp
|| comp
->attr
.artificial
)
2540 gfc_error ("Component initializer without name after component"
2541 " named %s at %L!", last_name
,
2542 actual
->expr
? &actual
->expr
->where
2543 : &gfc_current_locus
);
2545 gfc_error ("Too many components in structure constructor at "
2546 "%L!", actual
->expr
? &actual
->expr
->where
2547 : &gfc_current_locus
);
2551 comp_tail
->name
= xstrdup (comp
->name
);
2554 /* Find the current component in the structure definition and check
2555 its access is not private. */
2557 this_comp
= gfc_find_component (sym
, comp
->name
, false, false);
2560 this_comp
= gfc_find_component (sym
, (const char *)comp_tail
->name
,
2562 comp
= NULL
; /* Reset needed! */
2565 /* Here we can check if a component name is given which does not
2566 correspond to any component of the defined structure. */
2570 comp_tail
->val
= actual
->expr
;
2571 if (actual
->expr
!= NULL
)
2572 comp_tail
->where
= actual
->expr
->where
;
2573 actual
->expr
= NULL
;
2575 /* Check if this component is already given a value. */
2576 for (comp_iter
= comp_head
; comp_iter
!= comp_tail
;
2577 comp_iter
= comp_iter
->next
)
2579 gcc_assert (comp_iter
);
2580 if (!strcmp (comp_iter
->name
, comp_tail
->name
))
2582 gfc_error ("Component %qs is initialized twice in the structure"
2583 " constructor at %L!", comp_tail
->name
,
2584 comp_tail
->val
? &comp_tail
->where
2585 : &gfc_current_locus
);
2590 /* F2008, R457/C725, for PURE C1283. */
2591 if (this_comp
->attr
.pointer
&& comp_tail
->val
2592 && gfc_is_coindexed (comp_tail
->val
))
2594 gfc_error ("Coindexed expression to pointer component %qs in "
2595 "structure constructor at %L!", comp_tail
->name
,
2600 /* If not explicitly a parent constructor, gather up the components
2602 if (comp
&& comp
== sym
->components
2603 && sym
->attr
.extension
2605 && (comp_tail
->val
->ts
.type
!= BT_DERIVED
2607 comp_tail
->val
->ts
.u
.derived
!= this_comp
->ts
.u
.derived
))
2610 gfc_actual_arglist
*arg_null
= NULL
;
2612 actual
->expr
= comp_tail
->val
;
2613 comp_tail
->val
= NULL
;
2615 m
= gfc_convert_to_structure_constructor (NULL
,
2616 comp
->ts
.u
.derived
, &comp_tail
->val
,
2617 comp
->ts
.u
.derived
->attr
.zero_comp
2618 ? &arg_null
: &actual
, true);
2622 if (comp
->ts
.u
.derived
->attr
.zero_comp
)
2631 if (parent
&& !comp
)
2635 actual
= actual
->next
;
2638 if (!build_actual_constructor (&comp_head
, &ctor_head
, sym
))
2641 /* No component should be left, as this should have caused an error in the
2642 loop constructing the component-list (name that does not correspond to any
2643 component in the structure definition). */
2644 if (comp_head
&& sym
->attr
.extension
)
2646 for (comp_iter
= comp_head
; comp_iter
; comp_iter
= comp_iter
->next
)
2648 gfc_error ("component %qs at %L has already been set by a "
2649 "parent derived type constructor", comp_iter
->name
,
2655 gcc_assert (!comp_head
);
2659 expr
= gfc_get_structure_constructor_expr (BT_DERIVED
, 0, &gfc_current_locus
);
2660 expr
->ts
.u
.derived
= sym
;
2661 expr
->value
.constructor
= ctor_head
;
2666 expr
->ts
.u
.derived
= sym
;
2668 expr
->ts
.type
= BT_DERIVED
;
2669 expr
->value
.constructor
= ctor_head
;
2670 expr
->expr_type
= EXPR_STRUCTURE
;
2673 gfc_current_locus
= old_locus
;
2679 gfc_current_locus
= old_locus
;
2681 for (comp_iter
= comp_head
; comp_iter
; )
2683 gfc_structure_ctor_component
*next
= comp_iter
->next
;
2684 gfc_free_structure_ctor_component (comp_iter
);
2687 gfc_constructor_free (ctor_head
);
2694 gfc_match_structure_constructor (gfc_symbol
*sym
, gfc_expr
**result
)
2698 gfc_symtree
*symtree
;
2700 gfc_get_sym_tree (sym
->name
, NULL
, &symtree
, false); /* Can't fail */
2702 e
= gfc_get_expr ();
2703 e
->symtree
= symtree
;
2704 e
->expr_type
= EXPR_FUNCTION
;
2706 gcc_assert (sym
->attr
.flavor
== FL_DERIVED
2707 && symtree
->n
.sym
->attr
.flavor
== FL_PROCEDURE
);
2708 e
->value
.function
.esym
= sym
;
2709 e
->symtree
->n
.sym
->attr
.generic
= 1;
2711 m
= gfc_match_actual_arglist (0, &e
->value
.function
.actual
);
2718 if (!gfc_convert_to_structure_constructor (e
, sym
, NULL
, NULL
, false))
2729 /* If the symbol is an implicit do loop index and implicitly typed,
2730 it should not be host associated. Provide a symtree from the
2731 current namespace. */
2733 check_for_implicit_index (gfc_symtree
**st
, gfc_symbol
**sym
)
2735 if ((*sym
)->attr
.flavor
== FL_VARIABLE
2736 && (*sym
)->ns
!= gfc_current_ns
2737 && (*sym
)->attr
.implied_index
2738 && (*sym
)->attr
.implicit_type
2739 && !(*sym
)->attr
.use_assoc
)
2742 i
= gfc_get_sym_tree ((*sym
)->name
, NULL
, st
, false);
2745 *sym
= (*st
)->n
.sym
;
2751 /* Procedure pointer as function result: Replace the function symbol by the
2752 auto-generated hidden result variable named "ppr@". */
2755 replace_hidden_procptr_result (gfc_symbol
**sym
, gfc_symtree
**st
)
2757 /* Check for procedure pointer result variable. */
2758 if ((*sym
)->attr
.function
&& !(*sym
)->attr
.external
2759 && (*sym
)->result
&& (*sym
)->result
!= *sym
2760 && (*sym
)->result
->attr
.proc_pointer
2761 && (*sym
) == gfc_current_ns
->proc_name
2762 && (*sym
) == (*sym
)->result
->ns
->proc_name
2763 && strcmp ("ppr@", (*sym
)->result
->name
) == 0)
2765 /* Automatic replacement with "hidden" result variable. */
2766 (*sym
)->result
->attr
.referenced
= (*sym
)->attr
.referenced
;
2767 *sym
= (*sym
)->result
;
2768 *st
= gfc_find_symtree ((*sym
)->ns
->sym_root
, (*sym
)->name
);
2775 /* Matches a variable name followed by anything that might follow it--
2776 array reference, argument list of a function, etc. */
2779 gfc_match_rvalue (gfc_expr
**result
)
2781 gfc_actual_arglist
*actual_arglist
;
2782 char name
[GFC_MAX_SYMBOL_LEN
+ 1], argname
[GFC_MAX_SYMBOL_LEN
+ 1];
2785 gfc_symtree
*symtree
;
2786 locus where
, old_loc
;
2794 m
= gfc_match_name (name
);
2798 if (gfc_find_state (COMP_INTERFACE
)
2799 && !gfc_current_ns
->has_import_set
)
2800 i
= gfc_get_sym_tree (name
, NULL
, &symtree
, false);
2802 i
= gfc_get_ha_sym_tree (name
, &symtree
);
2807 sym
= symtree
->n
.sym
;
2809 where
= gfc_current_locus
;
2811 replace_hidden_procptr_result (&sym
, &symtree
);
2813 /* If this is an implicit do loop index and implicitly typed,
2814 it should not be host associated. */
2815 m
= check_for_implicit_index (&symtree
, &sym
);
2819 gfc_set_sym_referenced (sym
);
2820 sym
->attr
.implied_index
= 0;
2822 if (sym
->attr
.function
&& sym
->result
== sym
)
2824 /* See if this is a directly recursive function call. */
2825 gfc_gobble_whitespace ();
2826 if (sym
->attr
.recursive
2827 && gfc_peek_ascii_char () == '('
2828 && gfc_current_ns
->proc_name
== sym
2829 && !sym
->attr
.dimension
)
2831 gfc_error ("%qs at %C is the name of a recursive function "
2832 "and so refers to the result variable. Use an "
2833 "explicit RESULT variable for direct recursion "
2834 "(12.5.2.1)", sym
->name
);
2838 if (gfc_is_function_return_value (sym
, gfc_current_ns
))
2842 && (sym
->ns
== gfc_current_ns
2843 || sym
->ns
== gfc_current_ns
->parent
))
2845 gfc_entry_list
*el
= NULL
;
2847 for (el
= sym
->ns
->entries
; el
; el
= el
->next
)
2853 if (gfc_matching_procptr_assignment
)
2856 if (sym
->attr
.function
|| sym
->attr
.external
|| sym
->attr
.intrinsic
)
2859 if (sym
->attr
.generic
)
2860 goto generic_function
;
2862 switch (sym
->attr
.flavor
)
2866 e
= gfc_get_expr ();
2868 e
->expr_type
= EXPR_VARIABLE
;
2869 e
->symtree
= symtree
;
2871 m
= gfc_match_varspec (e
, 0, false, true);
2875 /* A statement of the form "REAL, parameter :: a(0:10) = 1" will
2876 end up here. Unfortunately, sym->value->expr_type is set to
2877 EXPR_CONSTANT, and so the if () branch would be followed without
2878 the !sym->as check. */
2879 if (sym
->value
&& sym
->value
->expr_type
!= EXPR_ARRAY
&& !sym
->as
)
2880 e
= gfc_copy_expr (sym
->value
);
2883 e
= gfc_get_expr ();
2884 e
->expr_type
= EXPR_VARIABLE
;
2887 e
->symtree
= symtree
;
2888 m
= gfc_match_varspec (e
, 0, false, true);
2890 if (sym
->ts
.is_c_interop
|| sym
->ts
.is_iso_c
)
2893 /* Variable array references to derived type parameters cause
2894 all sorts of headaches in simplification. Treating such
2895 expressions as variable works just fine for all array
2897 if (sym
->value
&& sym
->ts
.type
== BT_DERIVED
&& e
->ref
)
2899 for (ref
= e
->ref
; ref
; ref
= ref
->next
)
2900 if (ref
->type
== REF_ARRAY
)
2903 if (ref
== NULL
|| ref
->u
.ar
.type
== AR_FULL
)
2909 e
= gfc_get_expr ();
2910 e
->expr_type
= EXPR_VARIABLE
;
2911 e
->symtree
= symtree
;
2918 sym
= gfc_use_derived (sym
);
2922 goto generic_function
;
2925 /* If we're here, then the name is known to be the name of a
2926 procedure, yet it is not sure to be the name of a function. */
2929 /* Procedure Pointer Assignments. */
2931 if (gfc_matching_procptr_assignment
)
2933 gfc_gobble_whitespace ();
2934 if (!sym
->attr
.dimension
&& gfc_peek_ascii_char () == '(')
2935 /* Parse functions returning a procptr. */
2938 e
= gfc_get_expr ();
2939 e
->expr_type
= EXPR_VARIABLE
;
2940 e
->symtree
= symtree
;
2941 m
= gfc_match_varspec (e
, 0, false, true);
2942 if (!e
->ref
&& sym
->attr
.flavor
== FL_UNKNOWN
2943 && sym
->ts
.type
== BT_UNKNOWN
2944 && !gfc_add_flavor (&sym
->attr
, FL_PROCEDURE
, sym
->name
, NULL
))
2952 if (sym
->attr
.subroutine
)
2954 gfc_error ("Unexpected use of subroutine name %qs at %C",
2960 /* At this point, the name has to be a non-statement function.
2961 If the name is the same as the current function being
2962 compiled, then we have a variable reference (to the function
2963 result) if the name is non-recursive. */
2965 st
= gfc_enclosing_unit (NULL
);
2967 if (st
!= NULL
&& st
->state
== COMP_FUNCTION
2969 && !sym
->attr
.recursive
)
2971 e
= gfc_get_expr ();
2972 e
->symtree
= symtree
;
2973 e
->expr_type
= EXPR_VARIABLE
;
2975 m
= gfc_match_varspec (e
, 0, false, true);
2979 /* Match a function reference. */
2981 m
= gfc_match_actual_arglist (0, &actual_arglist
);
2984 if (sym
->attr
.proc
== PROC_ST_FUNCTION
)
2985 gfc_error ("Statement function %qs requires argument list at %C",
2988 gfc_error ("Function %qs requires an argument list at %C",
3001 gfc_get_ha_sym_tree (name
, &symtree
); /* Can't fail */
3002 sym
= symtree
->n
.sym
;
3004 replace_hidden_procptr_result (&sym
, &symtree
);
3006 e
= gfc_get_expr ();
3007 e
->symtree
= symtree
;
3008 e
->expr_type
= EXPR_FUNCTION
;
3009 e
->value
.function
.actual
= actual_arglist
;
3010 e
->where
= gfc_current_locus
;
3012 if (sym
->ts
.type
== BT_CLASS
&& sym
->attr
.class_ok
3013 && CLASS_DATA (sym
)->as
)
3014 e
->rank
= CLASS_DATA (sym
)->as
->rank
;
3015 else if (sym
->as
!= NULL
)
3016 e
->rank
= sym
->as
->rank
;
3018 if (!sym
->attr
.function
3019 && !gfc_add_function (&sym
->attr
, sym
->name
, NULL
))
3025 /* Check here for the existence of at least one argument for the
3026 iso_c_binding functions C_LOC, C_FUNLOC, and C_ASSOCIATED. The
3027 argument(s) given will be checked in gfc_iso_c_func_interface,
3028 during resolution of the function call. */
3029 if (sym
->attr
.is_iso_c
== 1
3030 && (sym
->from_intmod
== INTMOD_ISO_C_BINDING
3031 && (sym
->intmod_sym_id
== ISOCBINDING_LOC
3032 || sym
->intmod_sym_id
== ISOCBINDING_FUNLOC
3033 || sym
->intmod_sym_id
== ISOCBINDING_ASSOCIATED
)))
3035 /* make sure we were given a param */
3036 if (actual_arglist
== NULL
)
3038 gfc_error ("Missing argument to %qs at %C", sym
->name
);
3044 if (sym
->result
== NULL
)
3052 /* Special case for derived type variables that get their types
3053 via an IMPLICIT statement. This can't wait for the
3054 resolution phase. */
3056 if (gfc_peek_ascii_char () == '%'
3057 && sym
->ts
.type
== BT_UNKNOWN
3058 && gfc_get_default_type (sym
->name
, sym
->ns
)->type
== BT_DERIVED
)
3059 gfc_set_default_type (sym
, 0, sym
->ns
);
3061 /* If the symbol has a (co)dimension attribute, the expression is a
3064 if (sym
->attr
.dimension
|| sym
->attr
.codimension
)
3066 if (!gfc_add_flavor (&sym
->attr
, FL_VARIABLE
, sym
->name
, NULL
))
3072 e
= gfc_get_expr ();
3073 e
->symtree
= symtree
;
3074 e
->expr_type
= EXPR_VARIABLE
;
3075 m
= gfc_match_varspec (e
, 0, false, true);
3079 if (sym
->ts
.type
== BT_CLASS
&& sym
->attr
.class_ok
3080 && (CLASS_DATA (sym
)->attr
.dimension
3081 || CLASS_DATA (sym
)->attr
.codimension
))
3083 if (!gfc_add_flavor (&sym
->attr
, FL_VARIABLE
, sym
->name
, NULL
))
3089 e
= gfc_get_expr ();
3090 e
->symtree
= symtree
;
3091 e
->expr_type
= EXPR_VARIABLE
;
3092 m
= gfc_match_varspec (e
, 0, false, true);
3096 /* Name is not an array, so we peek to see if a '(' implies a
3097 function call or a substring reference. Otherwise the
3098 variable is just a scalar. */
3100 gfc_gobble_whitespace ();
3101 if (gfc_peek_ascii_char () != '(')
3103 /* Assume a scalar variable */
3104 e
= gfc_get_expr ();
3105 e
->symtree
= symtree
;
3106 e
->expr_type
= EXPR_VARIABLE
;
3108 if (!gfc_add_flavor (&sym
->attr
, FL_VARIABLE
, sym
->name
, NULL
))
3114 /*FIXME:??? gfc_match_varspec does set this for us: */
3116 m
= gfc_match_varspec (e
, 0, false, true);
3120 /* See if this is a function reference with a keyword argument
3121 as first argument. We do this because otherwise a spurious
3122 symbol would end up in the symbol table. */
3124 old_loc
= gfc_current_locus
;
3125 m2
= gfc_match (" ( %n =", argname
);
3126 gfc_current_locus
= old_loc
;
3128 e
= gfc_get_expr ();
3129 e
->symtree
= symtree
;
3131 if (m2
!= MATCH_YES
)
3133 /* Try to figure out whether we're dealing with a character type.
3134 We're peeking ahead here, because we don't want to call
3135 match_substring if we're dealing with an implicitly typed
3136 non-character variable. */
3137 implicit_char
= false;
3138 if (sym
->ts
.type
== BT_UNKNOWN
)
3140 ts
= gfc_get_default_type (sym
->name
, NULL
);
3141 if (ts
->type
== BT_CHARACTER
)
3142 implicit_char
= true;
3145 /* See if this could possibly be a substring reference of a name
3146 that we're not sure is a variable yet. */
3148 if ((implicit_char
|| sym
->ts
.type
== BT_CHARACTER
)
3149 && match_substring (sym
->ts
.u
.cl
, 0, &e
->ref
) == MATCH_YES
)
3152 e
->expr_type
= EXPR_VARIABLE
;
3154 if (sym
->attr
.flavor
!= FL_VARIABLE
3155 && !gfc_add_flavor (&sym
->attr
, FL_VARIABLE
,
3162 if (sym
->ts
.type
== BT_UNKNOWN
3163 && !gfc_set_default_type (sym
, 1, NULL
))
3177 /* Give up, assume we have a function. */
3179 gfc_get_sym_tree (name
, NULL
, &symtree
, false); /* Can't fail */
3180 sym
= symtree
->n
.sym
;
3181 e
->expr_type
= EXPR_FUNCTION
;
3183 if (!sym
->attr
.function
3184 && !gfc_add_function (&sym
->attr
, sym
->name
, NULL
))
3192 m
= gfc_match_actual_arglist (0, &e
->value
.function
.actual
);
3194 gfc_error ("Missing argument list in function %qs at %C", sym
->name
);
3202 /* If our new function returns a character, array or structure
3203 type, it might have subsequent references. */
3205 m
= gfc_match_varspec (e
, 0, false, true);
3212 gfc_get_sym_tree (name
, NULL
, &symtree
, false); /* Can't fail */
3214 e
= gfc_get_expr ();
3215 e
->symtree
= symtree
;
3216 e
->expr_type
= EXPR_FUNCTION
;
3218 if (sym
->attr
.flavor
== FL_DERIVED
)
3220 e
->value
.function
.esym
= sym
;
3221 e
->symtree
->n
.sym
->attr
.generic
= 1;
3224 m
= gfc_match_actual_arglist (0, &e
->value
.function
.actual
);
3228 gfc_error ("Symbol at %C is not appropriate for an expression");
3244 /* Match a variable, i.e. something that can be assigned to. This
3245 starts as a symbol, can be a structure component or an array
3246 reference. It can be a function if the function doesn't have a
3247 separate RESULT variable. If the symbol has not been previously
3248 seen, we assume it is a variable.
3250 This function is called by two interface functions:
3251 gfc_match_variable, which has host_flag = 1, and
3252 gfc_match_equiv_variable, with host_flag = 0, to restrict the
3253 match of the symbol to the local scope. */
3256 match_variable (gfc_expr
**result
, int equiv_flag
, int host_flag
)
3264 /* Since nothing has any business being an lvalue in a module
3265 specification block, an interface block or a contains section,
3266 we force the changed_symbols mechanism to work by setting
3267 host_flag to 0. This prevents valid symbols that have the name
3268 of keywords, such as 'end', being turned into variables by
3269 failed matching to assignments for, e.g., END INTERFACE. */
3270 if (gfc_current_state () == COMP_MODULE
3271 || gfc_current_state () == COMP_INTERFACE
3272 || gfc_current_state () == COMP_CONTAINS
)
3275 where
= gfc_current_locus
;
3276 m
= gfc_match_sym_tree (&st
, host_flag
);
3282 /* If this is an implicit do loop index and implicitly typed,
3283 it should not be host associated. */
3284 m
= check_for_implicit_index (&st
, &sym
);
3288 sym
->attr
.implied_index
= 0;
3290 gfc_set_sym_referenced (sym
);
3291 switch (sym
->attr
.flavor
)
3294 /* Everything is alright. */
3299 sym_flavor flavor
= FL_UNKNOWN
;
3301 gfc_gobble_whitespace ();
3303 if (sym
->attr
.external
|| sym
->attr
.procedure
3304 || sym
->attr
.function
|| sym
->attr
.subroutine
)
3305 flavor
= FL_PROCEDURE
;
3307 /* If it is not a procedure, is not typed and is host associated,
3308 we cannot give it a flavor yet. */
3309 else if (sym
->ns
== gfc_current_ns
->parent
3310 && sym
->ts
.type
== BT_UNKNOWN
)
3313 /* These are definitive indicators that this is a variable. */
3314 else if (gfc_peek_ascii_char () != '(' || sym
->ts
.type
!= BT_UNKNOWN
3315 || sym
->attr
.pointer
|| sym
->as
!= NULL
)
3316 flavor
= FL_VARIABLE
;
3318 if (flavor
!= FL_UNKNOWN
3319 && !gfc_add_flavor (&sym
->attr
, flavor
, sym
->name
, NULL
))
3327 gfc_error ("Named constant at %C in an EQUIVALENCE");
3330 /* Otherwise this is checked for and an error given in the
3331 variable definition context checks. */
3335 /* Check for a nonrecursive function result variable. */
3336 if (sym
->attr
.function
3337 && !sym
->attr
.external
3338 && sym
->result
== sym
3339 && (gfc_is_function_return_value (sym
, gfc_current_ns
)
3341 && sym
->ns
== gfc_current_ns
)
3343 && sym
->ns
== gfc_current_ns
->parent
)))
3345 /* If a function result is a derived type, then the derived
3346 type may still have to be resolved. */
3348 if (sym
->ts
.type
== BT_DERIVED
3349 && gfc_use_derived (sym
->ts
.u
.derived
) == NULL
)
3354 if (sym
->attr
.proc_pointer
3355 || replace_hidden_procptr_result (&sym
, &st
))
3358 /* Fall through to error */
3361 gfc_error ("%qs at %C is not a variable", sym
->name
);
3365 /* Special case for derived type variables that get their types
3366 via an IMPLICIT statement. This can't wait for the
3367 resolution phase. */
3370 gfc_namespace
* implicit_ns
;
3372 if (gfc_current_ns
->proc_name
== sym
)
3373 implicit_ns
= gfc_current_ns
;
3375 implicit_ns
= sym
->ns
;
3377 if (gfc_peek_ascii_char () == '%'
3378 && sym
->ts
.type
== BT_UNKNOWN
3379 && gfc_get_default_type (sym
->name
, implicit_ns
)->type
== BT_DERIVED
)
3380 gfc_set_default_type (sym
, 0, implicit_ns
);
3383 expr
= gfc_get_expr ();
3385 expr
->expr_type
= EXPR_VARIABLE
;
3388 expr
->where
= where
;
3390 /* Now see if we have to do more. */
3391 m
= gfc_match_varspec (expr
, equiv_flag
, false, false);
3394 gfc_free_expr (expr
);
3404 gfc_match_variable (gfc_expr
**result
, int equiv_flag
)
3406 return match_variable (result
, equiv_flag
, 1);
3411 gfc_match_equiv_variable (gfc_expr
**result
)
3413 return match_variable (result
, 1, 0);