1 /* Primary expression subroutines
2 Copyright (C) 2000-2016 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
, bool deferred
)
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
&& !deferred
)
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
, false) != 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 bool def
= primary
->ts
.deferred
== 1;
2137 switch (match_substring (primary
->ts
.u
.cl
, equiv_flag
, &substring
, def
))
2141 primary
->ref
= substring
;
2143 tail
->next
= substring
;
2145 if (primary
->expr_type
== EXPR_CONSTANT
)
2146 primary
->expr_type
= EXPR_SUBSTRING
;
2149 primary
->ts
.u
.cl
= NULL
;
2156 gfc_clear_ts (&primary
->ts
);
2157 gfc_clear_ts (&sym
->ts
);
2167 if (primary
->expr_type
== EXPR_PPC
&& gfc_is_coindexed (primary
))
2169 gfc_error ("Coindexed procedure-pointer component at %C");
2177 /* Given an expression that is a variable, figure out what the
2178 ultimate variable's type and attribute is, traversing the reference
2179 structures if necessary.
2181 This subroutine is trickier than it looks. We start at the base
2182 symbol and store the attribute. Component references load a
2183 completely new attribute.
2185 A couple of rules come into play. Subobjects of targets are always
2186 targets themselves. If we see a component that goes through a
2187 pointer, then the expression must also be a target, since the
2188 pointer is associated with something (if it isn't core will soon be
2189 dumped). If we see a full part or section of an array, the
2190 expression is also an array.
2192 We can have at most one full array reference. */
2195 gfc_variable_attr (gfc_expr
*expr
, gfc_typespec
*ts
)
2197 int dimension
, codimension
, pointer
, allocatable
, target
;
2198 symbol_attribute attr
;
2201 gfc_component
*comp
;
2203 if (expr
->expr_type
!= EXPR_VARIABLE
&& expr
->expr_type
!= EXPR_FUNCTION
)
2204 gfc_internal_error ("gfc_variable_attr(): Expression isn't a variable");
2206 sym
= expr
->symtree
->n
.sym
;
2209 if (sym
->ts
.type
== BT_CLASS
&& sym
->attr
.class_ok
)
2211 dimension
= CLASS_DATA (sym
)->attr
.dimension
;
2212 codimension
= CLASS_DATA (sym
)->attr
.codimension
;
2213 pointer
= CLASS_DATA (sym
)->attr
.class_pointer
;
2214 allocatable
= CLASS_DATA (sym
)->attr
.allocatable
;
2218 dimension
= attr
.dimension
;
2219 codimension
= attr
.codimension
;
2220 pointer
= attr
.pointer
;
2221 allocatable
= attr
.allocatable
;
2224 target
= attr
.target
;
2225 if (pointer
|| attr
.proc_pointer
)
2228 if (ts
!= NULL
&& expr
->ts
.type
== BT_UNKNOWN
)
2231 for (ref
= expr
->ref
; ref
; ref
= ref
->next
)
2236 switch (ref
->u
.ar
.type
)
2243 allocatable
= pointer
= 0;
2248 /* Handle coarrays. */
2249 if (ref
->u
.ar
.dimen
> 0)
2250 allocatable
= pointer
= 0;
2254 /* If any of start, end or stride is not integer, there will
2255 already have been an error issued. */
2257 gfc_get_errors (NULL
, &errors
);
2259 gfc_internal_error ("gfc_variable_attr(): Bad array reference");
2265 comp
= ref
->u
.c
.component
;
2270 /* Don't set the string length if a substring reference
2272 if (ts
->type
== BT_CHARACTER
2273 && ref
->next
&& ref
->next
->type
== REF_SUBSTRING
)
2277 if (comp
->ts
.type
== BT_CLASS
)
2279 codimension
= CLASS_DATA (comp
)->attr
.codimension
;
2280 pointer
= CLASS_DATA (comp
)->attr
.class_pointer
;
2281 allocatable
= CLASS_DATA (comp
)->attr
.allocatable
;
2285 codimension
= comp
->attr
.codimension
;
2286 pointer
= comp
->attr
.pointer
;
2287 allocatable
= comp
->attr
.allocatable
;
2289 if (pointer
|| attr
.proc_pointer
)
2295 allocatable
= pointer
= 0;
2299 attr
.dimension
= dimension
;
2300 attr
.codimension
= codimension
;
2301 attr
.pointer
= pointer
;
2302 attr
.allocatable
= allocatable
;
2303 attr
.target
= target
;
2304 attr
.save
= sym
->attr
.save
;
2310 /* Return the attribute from a general expression. */
2313 gfc_expr_attr (gfc_expr
*e
)
2315 symbol_attribute attr
;
2317 switch (e
->expr_type
)
2320 attr
= gfc_variable_attr (e
, NULL
);
2324 gfc_clear_attr (&attr
);
2326 if (e
->value
.function
.esym
&& e
->value
.function
.esym
->result
)
2328 gfc_symbol
*sym
= e
->value
.function
.esym
->result
;
2330 if (sym
->ts
.type
== BT_CLASS
)
2332 attr
.dimension
= CLASS_DATA (sym
)->attr
.dimension
;
2333 attr
.pointer
= CLASS_DATA (sym
)->attr
.class_pointer
;
2334 attr
.allocatable
= CLASS_DATA (sym
)->attr
.allocatable
;
2338 attr
= gfc_variable_attr (e
, NULL
);
2340 /* TODO: NULL() returns pointers. May have to take care of this
2346 gfc_clear_attr (&attr
);
2354 /* Match a structure constructor. The initial symbol has already been
2357 typedef struct gfc_structure_ctor_component
2362 struct gfc_structure_ctor_component
* next
;
2364 gfc_structure_ctor_component
;
2366 #define gfc_get_structure_ctor_component() XCNEW (gfc_structure_ctor_component)
2369 gfc_free_structure_ctor_component (gfc_structure_ctor_component
*comp
)
2372 gfc_free_expr (comp
->val
);
2377 /* Translate the component list into the actual constructor by sorting it in
2378 the order required; this also checks along the way that each and every
2379 component actually has an initializer and handles default initializers
2380 for components without explicit value given. */
2382 build_actual_constructor (gfc_structure_ctor_component
**comp_head
,
2383 gfc_constructor_base
*ctor_head
, gfc_symbol
*sym
)
2385 gfc_structure_ctor_component
*comp_iter
;
2386 gfc_component
*comp
;
2388 for (comp
= sym
->components
; comp
; comp
= comp
->next
)
2390 gfc_structure_ctor_component
**next_ptr
;
2391 gfc_expr
*value
= NULL
;
2393 /* Try to find the initializer for the current component by name. */
2394 next_ptr
= comp_head
;
2395 for (comp_iter
= *comp_head
; comp_iter
; comp_iter
= comp_iter
->next
)
2397 if (!strcmp (comp_iter
->name
, comp
->name
))
2399 next_ptr
= &comp_iter
->next
;
2402 /* If an extension, try building the parent derived type by building
2403 a value expression for the parent derived type and calling self. */
2404 if (!comp_iter
&& comp
== sym
->components
&& sym
->attr
.extension
)
2406 value
= gfc_get_structure_constructor_expr (comp
->ts
.type
,
2408 &gfc_current_locus
);
2409 value
->ts
= comp
->ts
;
2411 if (!build_actual_constructor (comp_head
,
2412 &value
->value
.constructor
,
2413 comp
->ts
.u
.derived
))
2415 gfc_free_expr (value
);
2419 gfc_constructor_append_expr (ctor_head
, value
, NULL
);
2423 /* If it was not found, try the default initializer if there's any;
2424 otherwise, it's an error unless this is a deferred parameter. */
2427 if (comp
->initializer
)
2429 if (!gfc_notify_std (GFC_STD_F2003
, "Structure constructor "
2430 "with missing optional arguments at %C"))
2432 value
= gfc_copy_expr (comp
->initializer
);
2434 else if (comp
->attr
.allocatable
2435 || (comp
->ts
.type
== BT_CLASS
2436 && CLASS_DATA (comp
)->attr
.allocatable
))
2438 if (!gfc_notify_std (GFC_STD_F2008
, "No initializer for "
2439 "allocatable component '%qs' given in the "
2440 "structure constructor at %C", comp
->name
))
2443 else if (!comp
->attr
.artificial
)
2445 gfc_error ("No initializer for component %qs given in the"
2446 " structure constructor at %C!", comp
->name
);
2451 value
= comp_iter
->val
;
2453 /* Add the value to the constructor chain built. */
2454 gfc_constructor_append_expr (ctor_head
, value
, NULL
);
2456 /* Remove the entry from the component list. We don't want the expression
2457 value to be free'd, so set it to NULL. */
2460 *next_ptr
= comp_iter
->next
;
2461 comp_iter
->val
= NULL
;
2462 gfc_free_structure_ctor_component (comp_iter
);
2470 gfc_convert_to_structure_constructor (gfc_expr
*e
, gfc_symbol
*sym
, gfc_expr
**cexpr
,
2471 gfc_actual_arglist
**arglist
,
2474 gfc_actual_arglist
*actual
;
2475 gfc_structure_ctor_component
*comp_tail
, *comp_head
, *comp_iter
;
2476 gfc_constructor_base ctor_head
= NULL
;
2477 gfc_component
*comp
; /* Is set NULL when named component is first seen */
2478 const char* last_name
= NULL
;
2482 expr
= parent
? *cexpr
: e
;
2483 old_locus
= gfc_current_locus
;
2485 ; /* gfc_current_locus = *arglist->expr ? ->where;*/
2487 gfc_current_locus
= expr
->where
;
2489 comp_tail
= comp_head
= NULL
;
2491 if (!parent
&& sym
->attr
.abstract
)
2493 gfc_error ("Can't construct ABSTRACT type %qs at %L",
2494 sym
->name
, &expr
->where
);
2498 comp
= sym
->components
;
2499 actual
= parent
? *arglist
: expr
->value
.function
.actual
;
2502 gfc_component
*this_comp
= NULL
;
2505 comp_tail
= comp_head
= gfc_get_structure_ctor_component ();
2508 comp_tail
->next
= gfc_get_structure_ctor_component ();
2509 comp_tail
= comp_tail
->next
;
2513 if (!gfc_notify_std (GFC_STD_F2003
, "Structure"
2514 " constructor with named arguments at %C"))
2517 comp_tail
->name
= xstrdup (actual
->name
);
2518 last_name
= comp_tail
->name
;
2523 /* Components without name are not allowed after the first named
2524 component initializer! */
2525 if (!comp
|| comp
->attr
.artificial
)
2528 gfc_error ("Component initializer without name after component"
2529 " named %s at %L!", last_name
,
2530 actual
->expr
? &actual
->expr
->where
2531 : &gfc_current_locus
);
2533 gfc_error ("Too many components in structure constructor at "
2534 "%L!", actual
->expr
? &actual
->expr
->where
2535 : &gfc_current_locus
);
2539 comp_tail
->name
= xstrdup (comp
->name
);
2542 /* Find the current component in the structure definition and check
2543 its access is not private. */
2545 this_comp
= gfc_find_component (sym
, comp
->name
, false, false);
2548 this_comp
= gfc_find_component (sym
, (const char *)comp_tail
->name
,
2550 comp
= NULL
; /* Reset needed! */
2553 /* Here we can check if a component name is given which does not
2554 correspond to any component of the defined structure. */
2558 comp_tail
->val
= actual
->expr
;
2559 if (actual
->expr
!= NULL
)
2560 comp_tail
->where
= actual
->expr
->where
;
2561 actual
->expr
= NULL
;
2563 /* Check if this component is already given a value. */
2564 for (comp_iter
= comp_head
; comp_iter
!= comp_tail
;
2565 comp_iter
= comp_iter
->next
)
2567 gcc_assert (comp_iter
);
2568 if (!strcmp (comp_iter
->name
, comp_tail
->name
))
2570 gfc_error ("Component %qs is initialized twice in the structure"
2571 " constructor at %L!", comp_tail
->name
,
2572 comp_tail
->val
? &comp_tail
->where
2573 : &gfc_current_locus
);
2578 /* F2008, R457/C725, for PURE C1283. */
2579 if (this_comp
->attr
.pointer
&& comp_tail
->val
2580 && gfc_is_coindexed (comp_tail
->val
))
2582 gfc_error ("Coindexed expression to pointer component %qs in "
2583 "structure constructor at %L!", comp_tail
->name
,
2588 /* If not explicitly a parent constructor, gather up the components
2590 if (comp
&& comp
== sym
->components
2591 && sym
->attr
.extension
2593 && (comp_tail
->val
->ts
.type
!= BT_DERIVED
2595 comp_tail
->val
->ts
.u
.derived
!= this_comp
->ts
.u
.derived
))
2598 gfc_actual_arglist
*arg_null
= NULL
;
2600 actual
->expr
= comp_tail
->val
;
2601 comp_tail
->val
= NULL
;
2603 m
= gfc_convert_to_structure_constructor (NULL
,
2604 comp
->ts
.u
.derived
, &comp_tail
->val
,
2605 comp
->ts
.u
.derived
->attr
.zero_comp
2606 ? &arg_null
: &actual
, true);
2610 if (comp
->ts
.u
.derived
->attr
.zero_comp
)
2619 if (parent
&& !comp
)
2623 actual
= actual
->next
;
2626 if (!build_actual_constructor (&comp_head
, &ctor_head
, sym
))
2629 /* No component should be left, as this should have caused an error in the
2630 loop constructing the component-list (name that does not correspond to any
2631 component in the structure definition). */
2632 if (comp_head
&& sym
->attr
.extension
)
2634 for (comp_iter
= comp_head
; comp_iter
; comp_iter
= comp_iter
->next
)
2636 gfc_error ("component %qs at %L has already been set by a "
2637 "parent derived type constructor", comp_iter
->name
,
2643 gcc_assert (!comp_head
);
2647 expr
= gfc_get_structure_constructor_expr (BT_DERIVED
, 0, &gfc_current_locus
);
2648 expr
->ts
.u
.derived
= sym
;
2649 expr
->value
.constructor
= ctor_head
;
2654 expr
->ts
.u
.derived
= sym
;
2656 expr
->ts
.type
= BT_DERIVED
;
2657 expr
->value
.constructor
= ctor_head
;
2658 expr
->expr_type
= EXPR_STRUCTURE
;
2661 gfc_current_locus
= old_locus
;
2667 gfc_current_locus
= old_locus
;
2669 for (comp_iter
= comp_head
; comp_iter
; )
2671 gfc_structure_ctor_component
*next
= comp_iter
->next
;
2672 gfc_free_structure_ctor_component (comp_iter
);
2675 gfc_constructor_free (ctor_head
);
2682 gfc_match_structure_constructor (gfc_symbol
*sym
, gfc_expr
**result
)
2686 gfc_symtree
*symtree
;
2688 gfc_get_ha_sym_tree (sym
->name
, &symtree
);
2690 e
= gfc_get_expr ();
2691 e
->symtree
= symtree
;
2692 e
->expr_type
= EXPR_FUNCTION
;
2694 gcc_assert (sym
->attr
.flavor
== FL_DERIVED
2695 && symtree
->n
.sym
->attr
.flavor
== FL_PROCEDURE
);
2696 e
->value
.function
.esym
= sym
;
2697 e
->symtree
->n
.sym
->attr
.generic
= 1;
2699 m
= gfc_match_actual_arglist (0, &e
->value
.function
.actual
);
2706 if (!gfc_convert_to_structure_constructor (e
, sym
, NULL
, NULL
, false))
2712 /* If a structure constructor is in a DATA statement, then each entity
2713 in the structure constructor must be a constant. Try to reduce the
2715 if (gfc_in_match_data ())
2716 gfc_reduce_init_expr (e
);
2723 /* If the symbol is an implicit do loop index and implicitly typed,
2724 it should not be host associated. Provide a symtree from the
2725 current namespace. */
2727 check_for_implicit_index (gfc_symtree
**st
, gfc_symbol
**sym
)
2729 if ((*sym
)->attr
.flavor
== FL_VARIABLE
2730 && (*sym
)->ns
!= gfc_current_ns
2731 && (*sym
)->attr
.implied_index
2732 && (*sym
)->attr
.implicit_type
2733 && !(*sym
)->attr
.use_assoc
)
2736 i
= gfc_get_sym_tree ((*sym
)->name
, NULL
, st
, false);
2739 *sym
= (*st
)->n
.sym
;
2745 /* Procedure pointer as function result: Replace the function symbol by the
2746 auto-generated hidden result variable named "ppr@". */
2749 replace_hidden_procptr_result (gfc_symbol
**sym
, gfc_symtree
**st
)
2751 /* Check for procedure pointer result variable. */
2752 if ((*sym
)->attr
.function
&& !(*sym
)->attr
.external
2753 && (*sym
)->result
&& (*sym
)->result
!= *sym
2754 && (*sym
)->result
->attr
.proc_pointer
2755 && (*sym
) == gfc_current_ns
->proc_name
2756 && (*sym
) == (*sym
)->result
->ns
->proc_name
2757 && strcmp ("ppr@", (*sym
)->result
->name
) == 0)
2759 /* Automatic replacement with "hidden" result variable. */
2760 (*sym
)->result
->attr
.referenced
= (*sym
)->attr
.referenced
;
2761 *sym
= (*sym
)->result
;
2762 *st
= gfc_find_symtree ((*sym
)->ns
->sym_root
, (*sym
)->name
);
2769 /* Matches a variable name followed by anything that might follow it--
2770 array reference, argument list of a function, etc. */
2773 gfc_match_rvalue (gfc_expr
**result
)
2775 gfc_actual_arglist
*actual_arglist
;
2776 char name
[GFC_MAX_SYMBOL_LEN
+ 1], argname
[GFC_MAX_SYMBOL_LEN
+ 1];
2779 gfc_symtree
*symtree
;
2780 locus where
, old_loc
;
2788 m
= gfc_match_name (name
);
2792 if (gfc_find_state (COMP_INTERFACE
)
2793 && !gfc_current_ns
->has_import_set
)
2794 i
= gfc_get_sym_tree (name
, NULL
, &symtree
, false);
2796 i
= gfc_get_ha_sym_tree (name
, &symtree
);
2801 sym
= symtree
->n
.sym
;
2803 where
= gfc_current_locus
;
2805 replace_hidden_procptr_result (&sym
, &symtree
);
2807 /* If this is an implicit do loop index and implicitly typed,
2808 it should not be host associated. */
2809 m
= check_for_implicit_index (&symtree
, &sym
);
2813 gfc_set_sym_referenced (sym
);
2814 sym
->attr
.implied_index
= 0;
2816 if (sym
->attr
.function
&& sym
->result
== sym
)
2818 /* See if this is a directly recursive function call. */
2819 gfc_gobble_whitespace ();
2820 if (sym
->attr
.recursive
2821 && gfc_peek_ascii_char () == '('
2822 && gfc_current_ns
->proc_name
== sym
2823 && !sym
->attr
.dimension
)
2825 gfc_error ("%qs at %C is the name of a recursive function "
2826 "and so refers to the result variable. Use an "
2827 "explicit RESULT variable for direct recursion "
2828 "(12.5.2.1)", sym
->name
);
2832 if (gfc_is_function_return_value (sym
, gfc_current_ns
))
2836 && (sym
->ns
== gfc_current_ns
2837 || sym
->ns
== gfc_current_ns
->parent
))
2839 gfc_entry_list
*el
= NULL
;
2841 for (el
= sym
->ns
->entries
; el
; el
= el
->next
)
2847 if (gfc_matching_procptr_assignment
)
2850 if (sym
->attr
.function
|| sym
->attr
.external
|| sym
->attr
.intrinsic
)
2853 if (sym
->attr
.generic
)
2854 goto generic_function
;
2856 switch (sym
->attr
.flavor
)
2860 e
= gfc_get_expr ();
2862 e
->expr_type
= EXPR_VARIABLE
;
2863 e
->symtree
= symtree
;
2865 m
= gfc_match_varspec (e
, 0, false, true);
2869 /* A statement of the form "REAL, parameter :: a(0:10) = 1" will
2870 end up here. Unfortunately, sym->value->expr_type is set to
2871 EXPR_CONSTANT, and so the if () branch would be followed without
2872 the !sym->as check. */
2873 if (sym
->value
&& sym
->value
->expr_type
!= EXPR_ARRAY
&& !sym
->as
)
2874 e
= gfc_copy_expr (sym
->value
);
2877 e
= gfc_get_expr ();
2878 e
->expr_type
= EXPR_VARIABLE
;
2881 e
->symtree
= symtree
;
2882 m
= gfc_match_varspec (e
, 0, false, true);
2884 if (sym
->ts
.is_c_interop
|| sym
->ts
.is_iso_c
)
2887 /* Variable array references to derived type parameters cause
2888 all sorts of headaches in simplification. Treating such
2889 expressions as variable works just fine for all array
2891 if (sym
->value
&& sym
->ts
.type
== BT_DERIVED
&& e
->ref
)
2893 for (ref
= e
->ref
; ref
; ref
= ref
->next
)
2894 if (ref
->type
== REF_ARRAY
)
2897 if (ref
== NULL
|| ref
->u
.ar
.type
== AR_FULL
)
2903 e
= gfc_get_expr ();
2904 e
->expr_type
= EXPR_VARIABLE
;
2905 e
->symtree
= symtree
;
2912 sym
= gfc_use_derived (sym
);
2916 goto generic_function
;
2919 /* If we're here, then the name is known to be the name of a
2920 procedure, yet it is not sure to be the name of a function. */
2923 /* Procedure Pointer Assignments. */
2925 if (gfc_matching_procptr_assignment
)
2927 gfc_gobble_whitespace ();
2928 if (!sym
->attr
.dimension
&& gfc_peek_ascii_char () == '(')
2929 /* Parse functions returning a procptr. */
2932 e
= gfc_get_expr ();
2933 e
->expr_type
= EXPR_VARIABLE
;
2934 e
->symtree
= symtree
;
2935 m
= gfc_match_varspec (e
, 0, false, true);
2936 if (!e
->ref
&& sym
->attr
.flavor
== FL_UNKNOWN
2937 && sym
->ts
.type
== BT_UNKNOWN
2938 && !gfc_add_flavor (&sym
->attr
, FL_PROCEDURE
, sym
->name
, NULL
))
2946 if (sym
->attr
.subroutine
)
2948 gfc_error ("Unexpected use of subroutine name %qs at %C",
2954 /* At this point, the name has to be a non-statement function.
2955 If the name is the same as the current function being
2956 compiled, then we have a variable reference (to the function
2957 result) if the name is non-recursive. */
2959 st
= gfc_enclosing_unit (NULL
);
2962 && st
->state
== COMP_FUNCTION
2964 && !sym
->attr
.recursive
)
2966 e
= gfc_get_expr ();
2967 e
->symtree
= symtree
;
2968 e
->expr_type
= EXPR_VARIABLE
;
2970 m
= gfc_match_varspec (e
, 0, false, true);
2974 /* Match a function reference. */
2976 m
= gfc_match_actual_arglist (0, &actual_arglist
);
2979 if (sym
->attr
.proc
== PROC_ST_FUNCTION
)
2980 gfc_error ("Statement function %qs requires argument list at %C",
2983 gfc_error ("Function %qs requires an argument list at %C",
2996 gfc_get_ha_sym_tree (name
, &symtree
); /* Can't fail */
2997 sym
= symtree
->n
.sym
;
2999 replace_hidden_procptr_result (&sym
, &symtree
);
3001 e
= gfc_get_expr ();
3002 e
->symtree
= symtree
;
3003 e
->expr_type
= EXPR_FUNCTION
;
3004 e
->value
.function
.actual
= actual_arglist
;
3005 e
->where
= gfc_current_locus
;
3007 if (sym
->ts
.type
== BT_CLASS
&& sym
->attr
.class_ok
3008 && CLASS_DATA (sym
)->as
)
3009 e
->rank
= CLASS_DATA (sym
)->as
->rank
;
3010 else if (sym
->as
!= NULL
)
3011 e
->rank
= sym
->as
->rank
;
3013 if (!sym
->attr
.function
3014 && !gfc_add_function (&sym
->attr
, sym
->name
, NULL
))
3020 /* Check here for the existence of at least one argument for the
3021 iso_c_binding functions C_LOC, C_FUNLOC, and C_ASSOCIATED. The
3022 argument(s) given will be checked in gfc_iso_c_func_interface,
3023 during resolution of the function call. */
3024 if (sym
->attr
.is_iso_c
== 1
3025 && (sym
->from_intmod
== INTMOD_ISO_C_BINDING
3026 && (sym
->intmod_sym_id
== ISOCBINDING_LOC
3027 || sym
->intmod_sym_id
== ISOCBINDING_FUNLOC
3028 || sym
->intmod_sym_id
== ISOCBINDING_ASSOCIATED
)))
3030 /* make sure we were given a param */
3031 if (actual_arglist
== NULL
)
3033 gfc_error ("Missing argument to %qs at %C", sym
->name
);
3039 if (sym
->result
== NULL
)
3047 /* Special case for derived type variables that get their types
3048 via an IMPLICIT statement. This can't wait for the
3049 resolution phase. */
3051 if (gfc_peek_ascii_char () == '%'
3052 && sym
->ts
.type
== BT_UNKNOWN
3053 && gfc_get_default_type (sym
->name
, sym
->ns
)->type
== BT_DERIVED
)
3054 gfc_set_default_type (sym
, 0, sym
->ns
);
3056 /* If the symbol has a (co)dimension attribute, the expression is a
3059 if (sym
->attr
.dimension
|| sym
->attr
.codimension
)
3061 if (!gfc_add_flavor (&sym
->attr
, FL_VARIABLE
, sym
->name
, NULL
))
3067 e
= gfc_get_expr ();
3068 e
->symtree
= symtree
;
3069 e
->expr_type
= EXPR_VARIABLE
;
3070 m
= gfc_match_varspec (e
, 0, false, true);
3074 if (sym
->ts
.type
== BT_CLASS
&& sym
->attr
.class_ok
3075 && (CLASS_DATA (sym
)->attr
.dimension
3076 || CLASS_DATA (sym
)->attr
.codimension
))
3078 if (!gfc_add_flavor (&sym
->attr
, FL_VARIABLE
, sym
->name
, NULL
))
3084 e
= gfc_get_expr ();
3085 e
->symtree
= symtree
;
3086 e
->expr_type
= EXPR_VARIABLE
;
3087 m
= gfc_match_varspec (e
, 0, false, true);
3091 /* Name is not an array, so we peek to see if a '(' implies a
3092 function call or a substring reference. Otherwise the
3093 variable is just a scalar. */
3095 gfc_gobble_whitespace ();
3096 if (gfc_peek_ascii_char () != '(')
3098 /* Assume a scalar variable */
3099 e
= gfc_get_expr ();
3100 e
->symtree
= symtree
;
3101 e
->expr_type
= EXPR_VARIABLE
;
3103 if (!gfc_add_flavor (&sym
->attr
, FL_VARIABLE
, sym
->name
, NULL
))
3109 /*FIXME:??? gfc_match_varspec does set this for us: */
3111 m
= gfc_match_varspec (e
, 0, false, true);
3115 /* See if this is a function reference with a keyword argument
3116 as first argument. We do this because otherwise a spurious
3117 symbol would end up in the symbol table. */
3119 old_loc
= gfc_current_locus
;
3120 m2
= gfc_match (" ( %n =", argname
);
3121 gfc_current_locus
= old_loc
;
3123 e
= gfc_get_expr ();
3124 e
->symtree
= symtree
;
3126 if (m2
!= MATCH_YES
)
3128 /* Try to figure out whether we're dealing with a character type.
3129 We're peeking ahead here, because we don't want to call
3130 match_substring if we're dealing with an implicitly typed
3131 non-character variable. */
3132 implicit_char
= false;
3133 if (sym
->ts
.type
== BT_UNKNOWN
)
3135 ts
= gfc_get_default_type (sym
->name
, NULL
);
3136 if (ts
->type
== BT_CHARACTER
)
3137 implicit_char
= true;
3140 /* See if this could possibly be a substring reference of a name
3141 that we're not sure is a variable yet. */
3143 if ((implicit_char
|| sym
->ts
.type
== BT_CHARACTER
)
3144 && match_substring (sym
->ts
.u
.cl
, 0, &e
->ref
, false) == MATCH_YES
)
3147 e
->expr_type
= EXPR_VARIABLE
;
3149 if (sym
->attr
.flavor
!= FL_VARIABLE
3150 && !gfc_add_flavor (&sym
->attr
, FL_VARIABLE
,
3157 if (sym
->ts
.type
== BT_UNKNOWN
3158 && !gfc_set_default_type (sym
, 1, NULL
))
3172 /* Give up, assume we have a function. */
3174 gfc_get_sym_tree (name
, NULL
, &symtree
, false); /* Can't fail */
3175 sym
= symtree
->n
.sym
;
3176 e
->expr_type
= EXPR_FUNCTION
;
3178 if (!sym
->attr
.function
3179 && !gfc_add_function (&sym
->attr
, sym
->name
, NULL
))
3187 m
= gfc_match_actual_arglist (0, &e
->value
.function
.actual
);
3189 gfc_error ("Missing argument list in function %qs at %C", sym
->name
);
3197 /* If our new function returns a character, array or structure
3198 type, it might have subsequent references. */
3200 m
= gfc_match_varspec (e
, 0, false, true);
3207 gfc_get_sym_tree (name
, NULL
, &symtree
, false); /* Can't fail */
3209 e
= gfc_get_expr ();
3210 e
->symtree
= symtree
;
3211 e
->expr_type
= EXPR_FUNCTION
;
3213 if (sym
->attr
.flavor
== FL_DERIVED
)
3215 e
->value
.function
.esym
= sym
;
3216 e
->symtree
->n
.sym
->attr
.generic
= 1;
3219 m
= gfc_match_actual_arglist (0, &e
->value
.function
.actual
);
3223 gfc_error ("Symbol at %C is not appropriate for an expression");
3239 /* Match a variable, i.e. something that can be assigned to. This
3240 starts as a symbol, can be a structure component or an array
3241 reference. It can be a function if the function doesn't have a
3242 separate RESULT variable. If the symbol has not been previously
3243 seen, we assume it is a variable.
3245 This function is called by two interface functions:
3246 gfc_match_variable, which has host_flag = 1, and
3247 gfc_match_equiv_variable, with host_flag = 0, to restrict the
3248 match of the symbol to the local scope. */
3251 match_variable (gfc_expr
**result
, int equiv_flag
, int host_flag
)
3259 /* Since nothing has any business being an lvalue in a module
3260 specification block, an interface block or a contains section,
3261 we force the changed_symbols mechanism to work by setting
3262 host_flag to 0. This prevents valid symbols that have the name
3263 of keywords, such as 'end', being turned into variables by
3264 failed matching to assignments for, e.g., END INTERFACE. */
3265 if (gfc_current_state () == COMP_MODULE
3266 || gfc_current_state () == COMP_SUBMODULE
3267 || gfc_current_state () == COMP_INTERFACE
3268 || gfc_current_state () == COMP_CONTAINS
)
3271 where
= gfc_current_locus
;
3272 m
= gfc_match_sym_tree (&st
, host_flag
);
3278 /* If this is an implicit do loop index and implicitly typed,
3279 it should not be host associated. */
3280 m
= check_for_implicit_index (&st
, &sym
);
3284 sym
->attr
.implied_index
= 0;
3286 gfc_set_sym_referenced (sym
);
3287 switch (sym
->attr
.flavor
)
3290 /* Everything is alright. */
3295 sym_flavor flavor
= FL_UNKNOWN
;
3297 gfc_gobble_whitespace ();
3299 if (sym
->attr
.external
|| sym
->attr
.procedure
3300 || sym
->attr
.function
|| sym
->attr
.subroutine
)
3301 flavor
= FL_PROCEDURE
;
3303 /* If it is not a procedure, is not typed and is host associated,
3304 we cannot give it a flavor yet. */
3305 else if (sym
->ns
== gfc_current_ns
->parent
3306 && sym
->ts
.type
== BT_UNKNOWN
)
3309 /* These are definitive indicators that this is a variable. */
3310 else if (gfc_peek_ascii_char () != '(' || sym
->ts
.type
!= BT_UNKNOWN
3311 || sym
->attr
.pointer
|| sym
->as
!= NULL
)
3312 flavor
= FL_VARIABLE
;
3314 if (flavor
!= FL_UNKNOWN
3315 && !gfc_add_flavor (&sym
->attr
, flavor
, sym
->name
, NULL
))
3323 gfc_error ("Named constant at %C in an EQUIVALENCE");
3326 /* Otherwise this is checked for and an error given in the
3327 variable definition context checks. */
3331 /* Check for a nonrecursive function result variable. */
3332 if (sym
->attr
.function
3333 && !sym
->attr
.external
3334 && sym
->result
== sym
3335 && (gfc_is_function_return_value (sym
, gfc_current_ns
)
3337 && sym
->ns
== gfc_current_ns
)
3339 && sym
->ns
== gfc_current_ns
->parent
)))
3341 /* If a function result is a derived type, then the derived
3342 type may still have to be resolved. */
3344 if (sym
->ts
.type
== BT_DERIVED
3345 && gfc_use_derived (sym
->ts
.u
.derived
) == NULL
)
3350 if (sym
->attr
.proc_pointer
3351 || replace_hidden_procptr_result (&sym
, &st
))
3354 /* Fall through to error */
3357 gfc_error ("%qs at %C is not a variable", sym
->name
);
3361 /* Special case for derived type variables that get their types
3362 via an IMPLICIT statement. This can't wait for the
3363 resolution phase. */
3366 gfc_namespace
* implicit_ns
;
3368 if (gfc_current_ns
->proc_name
== sym
)
3369 implicit_ns
= gfc_current_ns
;
3371 implicit_ns
= sym
->ns
;
3373 if (gfc_peek_ascii_char () == '%'
3374 && sym
->ts
.type
== BT_UNKNOWN
3375 && gfc_get_default_type (sym
->name
, implicit_ns
)->type
== BT_DERIVED
)
3376 gfc_set_default_type (sym
, 0, implicit_ns
);
3379 expr
= gfc_get_expr ();
3381 expr
->expr_type
= EXPR_VARIABLE
;
3384 expr
->where
= where
;
3386 /* Now see if we have to do more. */
3387 m
= gfc_match_varspec (expr
, equiv_flag
, false, false);
3390 gfc_free_expr (expr
);
3400 gfc_match_variable (gfc_expr
**result
, int equiv_flag
)
3402 return match_variable (result
, equiv_flag
, 1);
3407 gfc_match_equiv_variable (gfc_expr
**result
)
3409 return match_variable (result
, 1, 0);