1 /* Primary expression subroutines
2 Copyright (C) 2000-2018 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];
48 m
= gfc_match_small_literal_int (kind
, NULL
);
52 m
= gfc_match_name (name
);
56 if (gfc_find_symbol (name
, NULL
, 1, &sym
))
62 *is_iso_c
= sym
->attr
.is_iso_c
;
64 if (sym
->attr
.flavor
!= FL_PARAMETER
)
67 if (sym
->value
== NULL
)
70 if (gfc_extract_int (sym
->value
, kind
))
73 gfc_set_sym_referenced (sym
);
82 /* Get a trailing kind-specification for non-character variables.
84 * the integer kind value or
85 * -1 if an error was generated,
86 * -2 if no kind was found.
87 The argument 'is_iso_c' signals whether the kind is an ISO_C_BINDING
88 symbol like e.g. 'c_int'. */
91 get_kind (int *is_iso_c
)
98 if (gfc_match_char ('_') != MATCH_YES
)
101 m
= match_kind_param (&kind
, is_iso_c
);
103 gfc_error ("Missing kind-parameter at %C");
105 return (m
== MATCH_YES
) ? kind
: -1;
109 /* Given a character and a radix, see if the character is a valid
110 digit in that radix. */
113 gfc_check_digit (char c
, int radix
)
120 r
= ('0' <= c
&& c
<= '1');
124 r
= ('0' <= c
&& c
<= '7');
128 r
= ('0' <= c
&& c
<= '9');
136 gfc_internal_error ("gfc_check_digit(): bad radix");
143 /* Match the digit string part of an integer if signflag is not set,
144 the signed digit string part if signflag is set. If the buffer
145 is NULL, we just count characters for the resolution pass. Returns
146 the number of characters matched, -1 for no match. */
149 match_digits (int signflag
, int radix
, char *buffer
)
156 c
= gfc_next_ascii_char ();
158 if (signflag
&& (c
== '+' || c
== '-'))
162 gfc_gobble_whitespace ();
163 c
= gfc_next_ascii_char ();
167 if (!gfc_check_digit (c
, radix
))
176 old_loc
= gfc_current_locus
;
177 c
= gfc_next_ascii_char ();
179 if (!gfc_check_digit (c
, radix
))
187 gfc_current_locus
= old_loc
;
193 /* Match an integer (digit string and optional kind).
194 A sign will be accepted if signflag is set. */
197 match_integer_constant (gfc_expr
**result
, int signflag
)
199 int length
, kind
, is_iso_c
;
204 old_loc
= gfc_current_locus
;
205 gfc_gobble_whitespace ();
207 length
= match_digits (signflag
, 10, NULL
);
208 gfc_current_locus
= old_loc
;
212 buffer
= (char *) alloca (length
+ 1);
213 memset (buffer
, '\0', length
+ 1);
215 gfc_gobble_whitespace ();
217 match_digits (signflag
, 10, buffer
);
219 kind
= get_kind (&is_iso_c
);
221 kind
= gfc_default_integer_kind
;
225 if (kind
== 4 && flag_integer4_kind
== 8)
228 if (gfc_validate_kind (BT_INTEGER
, kind
, true) < 0)
230 gfc_error ("Integer kind %d at %C not available", kind
);
234 e
= gfc_convert_integer (buffer
, kind
, 10, &gfc_current_locus
);
235 e
->ts
.is_c_interop
= is_iso_c
;
237 if (gfc_range_check (e
) != ARITH_OK
)
239 gfc_error ("Integer too big for its kind at %C. This check can be "
240 "disabled with the option -fno-range-check");
251 /* Match a Hollerith constant. */
254 match_hollerith_constant (gfc_expr
**result
)
261 old_loc
= gfc_current_locus
;
262 gfc_gobble_whitespace ();
264 if (match_integer_constant (&e
, 0) == MATCH_YES
265 && gfc_match_char ('h') == MATCH_YES
)
267 if (!gfc_notify_std (GFC_STD_LEGACY
, "Hollerith constant at %C"))
270 if (gfc_extract_int (e
, &num
, 1))
274 gfc_error ("Invalid Hollerith constant: %L must contain at least "
275 "one character", &old_loc
);
278 if (e
->ts
.kind
!= gfc_default_integer_kind
)
280 gfc_error ("Invalid Hollerith constant: Integer kind at %L "
281 "should be default", &old_loc
);
287 e
= gfc_get_constant_expr (BT_HOLLERITH
, gfc_default_character_kind
,
290 /* Calculate padding needed to fit default integer memory. */
291 pad
= gfc_default_integer_kind
- (num
% gfc_default_integer_kind
);
293 e
->representation
.string
= XCNEWVEC (char, num
+ pad
+ 1);
295 for (i
= 0; i
< num
; i
++)
297 gfc_char_t c
= gfc_next_char_literal (INSTRING_WARN
);
298 if (! gfc_wide_fits_in_byte (c
))
300 gfc_error ("Invalid Hollerith constant at %L contains a "
301 "wide character", &old_loc
);
305 e
->representation
.string
[i
] = (unsigned char) c
;
308 /* Now pad with blanks and end with a null char. */
309 for (i
= 0; i
< pad
; i
++)
310 e
->representation
.string
[num
+ i
] = ' ';
312 e
->representation
.string
[num
+ i
] = '\0';
313 e
->representation
.length
= num
+ pad
;
322 gfc_current_locus
= old_loc
;
331 /* Match a binary, octal or hexadecimal constant that can be found in
332 a DATA statement. The standard permits b'010...', o'73...', and
333 z'a1...' where b, o, and z can be capital letters. This function
334 also accepts postfixed forms of the constants: '01...'b, '73...'o,
335 and 'a1...'z. An additional extension is the use of x for z. */
338 match_boz_constant (gfc_expr
**result
)
340 int radix
, length
, x_hex
, kind
;
341 locus old_loc
, start_loc
;
342 char *buffer
, post
, delim
;
345 start_loc
= old_loc
= gfc_current_locus
;
346 gfc_gobble_whitespace ();
349 switch (post
= gfc_next_ascii_char ())
371 radix
= 16; /* Set to accept any valid digit string. */
377 /* No whitespace allowed here. */
380 delim
= gfc_next_ascii_char ();
382 if (delim
!= '\'' && delim
!= '\"')
386 && (!gfc_notify_std(GFC_STD_GNU
, "Hexadecimal "
387 "constant at %C uses non-standard syntax")))
390 old_loc
= gfc_current_locus
;
392 length
= match_digits (0, radix
, NULL
);
395 gfc_error ("Empty set of digits in BOZ constant at %C");
399 if (gfc_next_ascii_char () != delim
)
401 gfc_error ("Illegal character in BOZ constant at %C");
407 switch (gfc_next_ascii_char ())
424 if (!gfc_notify_std (GFC_STD_GNU
, "BOZ constant "
425 "at %C uses non-standard postfix syntax"))
429 gfc_current_locus
= old_loc
;
431 buffer
= (char *) alloca (length
+ 1);
432 memset (buffer
, '\0', length
+ 1);
434 match_digits (0, radix
, buffer
);
435 gfc_next_ascii_char (); /* Eat delimiter. */
437 gfc_next_ascii_char (); /* Eat postfixed b, o, z, or x. */
439 /* In section 5.2.5 and following C567 in the Fortran 2003 standard, we find
440 "If a data-stmt-constant is a boz-literal-constant, the corresponding
441 variable shall be of type integer. The boz-literal-constant is treated
442 as if it were an int-literal-constant with a kind-param that specifies
443 the representation method with the largest decimal exponent range
444 supported by the processor." */
446 kind
= gfc_max_integer_kind
;
447 e
= gfc_convert_integer (buffer
, kind
, radix
, &gfc_current_locus
);
449 /* Mark as boz variable. */
452 if (gfc_range_check (e
) != ARITH_OK
)
454 gfc_error ("Integer too big for integer kind %i at %C", kind
);
459 if (!gfc_in_match_data ()
460 && (!gfc_notify_std(GFC_STD_F2003
, "BOZ used outside a DATA "
468 gfc_current_locus
= start_loc
;
473 /* Match a real constant of some sort. Allow a signed constant if signflag
477 match_real_constant (gfc_expr
**result
, int signflag
)
479 int kind
, count
, seen_dp
, seen_digits
, is_iso_c
, default_exponent
;
480 locus old_loc
, temp_loc
;
481 char *p
, *buffer
, c
, exp_char
;
485 old_loc
= gfc_current_locus
;
486 gfc_gobble_whitespace ();
490 default_exponent
= 0;
497 c
= gfc_next_ascii_char ();
498 if (signflag
&& (c
== '+' || c
== '-'))
503 gfc_gobble_whitespace ();
504 c
= gfc_next_ascii_char ();
507 /* Scan significand. */
508 for (;; c
= gfc_next_ascii_char (), count
++)
515 /* Check to see if "." goes with a following operator like
517 temp_loc
= gfc_current_locus
;
518 c
= gfc_next_ascii_char ();
520 if (c
== 'e' || c
== 'd' || c
== 'q')
522 c
= gfc_next_ascii_char ();
524 goto done
; /* Operator named .e. or .d. */
528 goto done
; /* Distinguish 1.e9 from 1.eq.2 */
530 gfc_current_locus
= temp_loc
;
544 if (!seen_digits
|| (c
!= 'e' && c
!= 'd' && c
!= 'q'))
551 if (!gfc_notify_std (GFC_STD_GNU
, "exponent-letter 'q' in "
552 "real-literal-constant at %C"))
554 else if (warn_real_q_constant
)
555 gfc_warning (OPT_Wreal_q_constant
,
556 "Extension: exponent-letter %<q%> in real-literal-constant "
561 c
= gfc_next_ascii_char ();
564 if (c
== '+' || c
== '-')
565 { /* optional sign */
566 c
= gfc_next_ascii_char ();
572 /* With -fdec, default exponent to 0 instead of complaining. */
574 default_exponent
= 1;
577 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
+ default_exponent
+ 1);
601 memset (buffer
, '\0', count
+ default_exponent
+ 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 ();
624 if (default_exponent
)
627 kind
= get_kind (&is_iso_c
);
636 gfc_error ("Real number at %C has a %<d%> exponent and an explicit "
640 kind
= gfc_default_double_kind
;
644 if (flag_real4_kind
== 8)
646 if (flag_real4_kind
== 10)
648 if (flag_real4_kind
== 16)
654 if (flag_real8_kind
== 4)
656 if (flag_real8_kind
== 10)
658 if (flag_real8_kind
== 16)
666 gfc_error ("Real number at %C has a %<q%> exponent and an explicit "
671 /* The maximum possible real kind type parameter is 16. First, try
672 that for the kind, then fallback to trying kind=10 (Intel 80 bit)
673 extended precision. If neither value works, just given up. */
675 if (gfc_validate_kind (BT_REAL
, kind
, true) < 0)
678 if (gfc_validate_kind (BT_REAL
, kind
, true) < 0)
680 gfc_error ("Invalid exponent-letter %<q%> in "
681 "real-literal-constant at %C");
689 kind
= gfc_default_real_kind
;
693 if (flag_real4_kind
== 8)
695 if (flag_real4_kind
== 10)
697 if (flag_real4_kind
== 16)
703 if (flag_real8_kind
== 4)
705 if (flag_real8_kind
== 10)
707 if (flag_real8_kind
== 16)
711 if (gfc_validate_kind (BT_REAL
, kind
, true) < 0)
713 gfc_error ("Invalid real kind %d at %C", kind
);
718 e
= gfc_convert_real (buffer
, kind
, &gfc_current_locus
);
720 mpfr_neg (e
->value
.real
, e
->value
.real
, GFC_RND_MODE
);
721 e
->ts
.is_c_interop
= is_iso_c
;
723 switch (gfc_range_check (e
))
728 gfc_error ("Real constant overflows its kind at %C");
731 case ARITH_UNDERFLOW
:
733 gfc_warning (OPT_Wunderflow
, "Real constant underflows its kind at %C");
734 mpfr_set_ui (e
->value
.real
, 0, GFC_RND_MODE
);
738 gfc_internal_error ("gfc_range_check() returned bad value");
741 /* Warn about trailing digits which suggest the user added too many
742 trailing digits, which may cause the appearance of higher pecision
743 than the kind kan support.
745 This is done by replacing the rightmost non-zero digit with zero
746 and comparing with the original value. If these are equal, we
747 assume the user supplied more digits than intended (or forgot to
748 convert to the correct kind).
751 if (warn_conversion_extra
)
757 c
= strchr (buffer
, 'e');
759 c
= buffer
+ strlen(buffer
);
762 for (p
= c
- 1; p
>= buffer
; p
--)
778 mpfr_set_str (r
, buffer
, 10, GFC_RND_MODE
);
780 mpfr_neg (r
, r
, GFC_RND_MODE
);
782 mpfr_sub (r
, r
, e
->value
.real
, GFC_RND_MODE
);
784 if (mpfr_cmp_ui (r
, 0) == 0)
785 gfc_warning (OPT_Wconversion_extra
, "Non-significant digits "
786 "in %qs number at %C, maybe incorrect KIND",
787 gfc_typename (&e
->ts
));
802 /* Match a substring reference. */
805 match_substring (gfc_charlen
*cl
, int init
, gfc_ref
**result
, bool deferred
)
807 gfc_expr
*start
, *end
;
815 old_loc
= gfc_current_locus
;
817 m
= gfc_match_char ('(');
821 if (gfc_match_char (':') != MATCH_YES
)
824 m
= gfc_match_init_expr (&start
);
826 m
= gfc_match_expr (&start
);
834 m
= gfc_match_char (':');
839 if (gfc_match_char (')') != MATCH_YES
)
842 m
= gfc_match_init_expr (&end
);
844 m
= gfc_match_expr (&end
);
848 if (m
== MATCH_ERROR
)
851 m
= gfc_match_char (')');
856 /* Optimize away the (:) reference. */
857 if (start
== NULL
&& end
== NULL
&& !deferred
)
861 ref
= gfc_get_ref ();
863 ref
->type
= REF_SUBSTRING
;
865 start
= gfc_get_int_expr (gfc_charlen_int_kind
, NULL
, 1);
866 ref
->u
.ss
.start
= start
;
867 if (end
== NULL
&& cl
)
868 end
= gfc_copy_expr (cl
->length
);
870 ref
->u
.ss
.length
= cl
;
877 gfc_error ("Syntax error in SUBSTRING specification at %C");
881 gfc_free_expr (start
);
884 gfc_current_locus
= old_loc
;
889 /* Reads the next character of a string constant, taking care to
890 return doubled delimiters on the input as a single instance of
893 Special return values for "ret" argument are:
894 -1 End of the string, as determined by the delimiter
895 -2 Unterminated string detected
897 Backslash codes are also expanded at this time. */
900 next_string_char (gfc_char_t delimiter
, int *ret
)
905 c
= gfc_next_char_literal (INSTRING_WARN
);
914 if (flag_backslash
&& c
== '\\')
916 old_locus
= gfc_current_locus
;
918 if (gfc_match_special_char (&c
) == MATCH_NO
)
919 gfc_current_locus
= old_locus
;
921 if (!(gfc_option
.allow_std
& GFC_STD_GNU
) && !inhibit_warnings
)
922 gfc_warning (0, "Extension: backslash character at %C");
928 old_locus
= gfc_current_locus
;
929 c
= gfc_next_char_literal (NONSTRING
);
933 gfc_current_locus
= old_locus
;
940 /* Special case of gfc_match_name() that matches a parameter kind name
941 before a string constant. This takes case of the weird but legal
946 where kind____ is a parameter. gfc_match_name() will happily slurp
947 up all the underscores, which leads to problems. If we return
948 MATCH_YES, the parse pointer points to the final underscore, which
949 is not part of the name. We never return MATCH_ERROR-- errors in
950 the name will be detected later. */
953 match_charkind_name (char *name
)
959 gfc_gobble_whitespace ();
960 c
= gfc_next_ascii_char ();
969 old_loc
= gfc_current_locus
;
970 c
= gfc_next_ascii_char ();
974 peek
= gfc_peek_ascii_char ();
976 if (peek
== '\'' || peek
== '\"')
978 gfc_current_locus
= old_loc
;
986 && (c
!= '$' || !flag_dollar_ok
))
990 if (++len
> GFC_MAX_SYMBOL_LEN
)
998 /* See if the current input matches a character constant. Lots of
999 contortions have to be done to match the kind parameter which comes
1000 before the actual string. The main consideration is that we don't
1001 want to error out too quickly. For example, we don't actually do
1002 any validation of the kinds until we have actually seen a legal
1003 delimiter. Using match_kind_param() generates errors too quickly. */
1006 match_string_constant (gfc_expr
**result
)
1008 char name
[GFC_MAX_SYMBOL_LEN
+ 1], peek
;
1010 int kind
,save_warn_ampersand
, ret
;
1011 locus old_locus
, start_locus
;
1015 gfc_char_t c
, delimiter
, *p
;
1017 old_locus
= gfc_current_locus
;
1019 gfc_gobble_whitespace ();
1021 c
= gfc_next_char ();
1022 if (c
== '\'' || c
== '"')
1024 kind
= gfc_default_character_kind
;
1025 start_locus
= gfc_current_locus
;
1029 if (gfc_wide_is_digit (c
))
1033 while (gfc_wide_is_digit (c
))
1035 kind
= kind
* 10 + c
- '0';
1038 c
= gfc_next_char ();
1044 gfc_current_locus
= old_locus
;
1046 m
= match_charkind_name (name
);
1050 if (gfc_find_symbol (name
, NULL
, 1, &sym
)
1052 || sym
->attr
.flavor
!= FL_PARAMETER
)
1056 c
= gfc_next_char ();
1061 gfc_gobble_whitespace ();
1062 c
= gfc_next_char ();
1068 gfc_gobble_whitespace ();
1070 c
= gfc_next_char ();
1071 if (c
!= '\'' && c
!= '"')
1074 start_locus
= gfc_current_locus
;
1078 if (gfc_extract_int (sym
->value
, &kind
, 1))
1080 gfc_set_sym_referenced (sym
);
1083 if (gfc_validate_kind (BT_CHARACTER
, kind
, true) < 0)
1085 gfc_error ("Invalid kind %d for CHARACTER constant at %C", kind
);
1090 /* Scan the string into a block of memory by first figuring out how
1091 long it is, allocating the structure, then re-reading it. This
1092 isn't particularly efficient, but string constants aren't that
1093 common in most code. TODO: Use obstacks? */
1100 c
= next_string_char (delimiter
, &ret
);
1105 gfc_current_locus
= start_locus
;
1106 gfc_error ("Unterminated character constant beginning at %C");
1113 /* Peek at the next character to see if it is a b, o, z, or x for the
1114 postfixed BOZ literal constants. */
1115 peek
= gfc_peek_ascii_char ();
1116 if (peek
== 'b' || peek
== 'o' || peek
=='z' || peek
== 'x')
1119 e
= gfc_get_character_expr (kind
, &start_locus
, NULL
, length
);
1121 gfc_current_locus
= start_locus
;
1123 /* We disable the warning for the following loop as the warning has already
1124 been printed in the loop above. */
1125 save_warn_ampersand
= warn_ampersand
;
1126 warn_ampersand
= false;
1128 p
= e
->value
.character
.string
;
1129 for (size_t i
= 0; i
< length
; i
++)
1131 c
= next_string_char (delimiter
, &ret
);
1133 if (!gfc_check_character_range (c
, kind
))
1136 gfc_error ("Character %qs in string at %C is not representable "
1137 "in character kind %d", gfc_print_wide_char (c
), kind
);
1144 *p
= '\0'; /* TODO: C-style string is for development/debug purposes. */
1145 warn_ampersand
= save_warn_ampersand
;
1147 next_string_char (delimiter
, &ret
);
1149 gfc_internal_error ("match_string_constant(): Delimiter not found");
1151 if (match_substring (NULL
, 0, &e
->ref
, false) != MATCH_NO
)
1152 e
->expr_type
= EXPR_SUBSTRING
;
1159 gfc_current_locus
= old_locus
;
1164 /* Match a .true. or .false. Returns 1 if a .true. was found,
1165 0 if a .false. was found, and -1 otherwise. */
1167 match_logical_constant_string (void)
1169 locus orig_loc
= gfc_current_locus
;
1171 gfc_gobble_whitespace ();
1172 if (gfc_next_ascii_char () == '.')
1174 char ch
= gfc_next_ascii_char ();
1177 if (gfc_next_ascii_char () == 'a'
1178 && gfc_next_ascii_char () == 'l'
1179 && gfc_next_ascii_char () == 's'
1180 && gfc_next_ascii_char () == 'e'
1181 && gfc_next_ascii_char () == '.')
1182 /* Matched ".false.". */
1187 if (gfc_next_ascii_char () == 'r'
1188 && gfc_next_ascii_char () == 'u'
1189 && gfc_next_ascii_char () == 'e'
1190 && gfc_next_ascii_char () == '.')
1191 /* Matched ".true.". */
1195 gfc_current_locus
= orig_loc
;
1199 /* Match a .true. or .false. */
1202 match_logical_constant (gfc_expr
**result
)
1205 int i
, kind
, is_iso_c
;
1207 i
= match_logical_constant_string ();
1211 kind
= get_kind (&is_iso_c
);
1215 kind
= gfc_default_logical_kind
;
1217 if (gfc_validate_kind (BT_LOGICAL
, kind
, true) < 0)
1219 gfc_error ("Bad kind for logical constant at %C");
1223 e
= gfc_get_logical_expr (kind
, &gfc_current_locus
, i
);
1224 e
->ts
.is_c_interop
= is_iso_c
;
1231 /* Match a real or imaginary part of a complex constant that is a
1232 symbolic constant. */
1235 match_sym_complex_part (gfc_expr
**result
)
1237 char name
[GFC_MAX_SYMBOL_LEN
+ 1];
1242 m
= gfc_match_name (name
);
1246 if (gfc_find_symbol (name
, NULL
, 1, &sym
) || sym
== NULL
)
1249 if (sym
->attr
.flavor
!= FL_PARAMETER
)
1251 /* Give the matcher for implied do-loops a chance to run. This yields
1252 a much saner error message for "write(*,*) (i, i=1, 6" where the
1253 right parenthesis is missing. */
1255 gfc_gobble_whitespace ();
1256 c
= gfc_peek_ascii_char ();
1257 if (c
== '=' || c
== ',')
1263 gfc_error ("Expected PARAMETER symbol in complex constant at %C");
1272 if (!gfc_numeric_ts (&sym
->value
->ts
))
1274 gfc_error ("Numeric PARAMETER required in complex constant at %C");
1278 if (sym
->value
->rank
!= 0)
1280 gfc_error ("Scalar PARAMETER required in complex constant at %C");
1284 if (!gfc_notify_std (GFC_STD_F2003
, "PARAMETER symbol in "
1285 "complex constant at %C"))
1288 switch (sym
->value
->ts
.type
)
1291 e
= gfc_copy_expr (sym
->value
);
1295 e
= gfc_complex2real (sym
->value
, sym
->value
->ts
.kind
);
1301 e
= gfc_int2real (sym
->value
, gfc_default_real_kind
);
1307 gfc_internal_error ("gfc_match_sym_complex_part(): Bad type");
1310 *result
= e
; /* e is a scalar, real, constant expression. */
1314 gfc_error ("Error converting PARAMETER constant in complex constant at %C");
1319 /* Match a real or imaginary part of a complex number. */
1322 match_complex_part (gfc_expr
**result
)
1326 m
= match_sym_complex_part (result
);
1330 m
= match_real_constant (result
, 1);
1334 return match_integer_constant (result
, 1);
1338 /* Try to match a complex constant. */
1341 match_complex_constant (gfc_expr
**result
)
1343 gfc_expr
*e
, *real
, *imag
;
1344 gfc_error_buffer old_error
;
1345 gfc_typespec target
;
1350 old_loc
= gfc_current_locus
;
1351 real
= imag
= e
= NULL
;
1353 m
= gfc_match_char ('(');
1357 gfc_push_error (&old_error
);
1359 m
= match_complex_part (&real
);
1362 gfc_free_error (&old_error
);
1366 if (gfc_match_char (',') == MATCH_NO
)
1368 /* It is possible that gfc_int2real issued a warning when
1369 converting an integer to real. Throw this away here. */
1371 gfc_clear_warning ();
1372 gfc_pop_error (&old_error
);
1377 /* If m is error, then something was wrong with the real part and we
1378 assume we have a complex constant because we've seen the ','. An
1379 ambiguous case here is the start of an iterator list of some
1380 sort. These sort of lists are matched prior to coming here. */
1382 if (m
== MATCH_ERROR
)
1384 gfc_free_error (&old_error
);
1387 gfc_pop_error (&old_error
);
1389 m
= match_complex_part (&imag
);
1392 if (m
== MATCH_ERROR
)
1395 m
= gfc_match_char (')');
1398 /* Give the matcher for implied do-loops a chance to run. This
1399 yields a much saner error message for (/ (i, 4=i, 6) /). */
1400 if (gfc_peek_ascii_char () == '=')
1409 if (m
== MATCH_ERROR
)
1412 /* Decide on the kind of this complex number. */
1413 if (real
->ts
.type
== BT_REAL
)
1415 if (imag
->ts
.type
== BT_REAL
)
1416 kind
= gfc_kind_max (real
, imag
);
1418 kind
= real
->ts
.kind
;
1422 if (imag
->ts
.type
== BT_REAL
)
1423 kind
= imag
->ts
.kind
;
1425 kind
= gfc_default_real_kind
;
1427 gfc_clear_ts (&target
);
1428 target
.type
= BT_REAL
;
1431 if (real
->ts
.type
!= BT_REAL
|| kind
!= real
->ts
.kind
)
1432 gfc_convert_type (real
, &target
, 2);
1433 if (imag
->ts
.type
!= BT_REAL
|| kind
!= imag
->ts
.kind
)
1434 gfc_convert_type (imag
, &target
, 2);
1436 e
= gfc_convert_complex (real
, imag
, kind
);
1437 e
->where
= gfc_current_locus
;
1439 gfc_free_expr (real
);
1440 gfc_free_expr (imag
);
1446 gfc_error ("Syntax error in COMPLEX constant at %C");
1451 gfc_free_expr (real
);
1452 gfc_free_expr (imag
);
1453 gfc_current_locus
= old_loc
;
1459 /* Match constants in any of several forms. Returns nonzero for a
1460 match, zero for no match. */
1463 gfc_match_literal_constant (gfc_expr
**result
, int signflag
)
1467 m
= match_complex_constant (result
);
1471 m
= match_string_constant (result
);
1475 m
= match_boz_constant (result
);
1479 m
= match_real_constant (result
, signflag
);
1483 m
= match_hollerith_constant (result
);
1487 m
= match_integer_constant (result
, signflag
);
1491 m
= match_logical_constant (result
);
1499 /* This checks if a symbol is the return value of an encompassing function.
1500 Function nesting can be maximally two levels deep, but we may have
1501 additional local namespaces like BLOCK etc. */
1504 gfc_is_function_return_value (gfc_symbol
*sym
, gfc_namespace
*ns
)
1506 if (!sym
->attr
.function
|| (sym
->result
!= sym
))
1510 if (ns
->proc_name
== sym
)
1518 /* Match a single actual argument value. An actual argument is
1519 usually an expression, but can also be a procedure name. If the
1520 argument is a single name, it is not always possible to tell
1521 whether the name is a dummy procedure or not. We treat these cases
1522 by creating an argument that looks like a dummy procedure and
1523 fixing things later during resolution. */
1526 match_actual_arg (gfc_expr
**result
)
1528 char name
[GFC_MAX_SYMBOL_LEN
+ 1];
1529 gfc_symtree
*symtree
;
1534 gfc_gobble_whitespace ();
1535 where
= gfc_current_locus
;
1537 switch (gfc_match_name (name
))
1546 w
= gfc_current_locus
;
1547 gfc_gobble_whitespace ();
1548 c
= gfc_next_ascii_char ();
1549 gfc_current_locus
= w
;
1551 if (c
!= ',' && c
!= ')')
1554 if (gfc_find_sym_tree (name
, NULL
, 1, &symtree
))
1556 /* Handle error elsewhere. */
1558 /* Eliminate a couple of common cases where we know we don't
1559 have a function argument. */
1560 if (symtree
== NULL
)
1562 gfc_get_sym_tree (name
, NULL
, &symtree
, false);
1563 gfc_set_sym_referenced (symtree
->n
.sym
);
1569 sym
= symtree
->n
.sym
;
1570 gfc_set_sym_referenced (sym
);
1571 if (sym
->attr
.flavor
== FL_NAMELIST
)
1573 gfc_error ("Namelist %qs can not be an argument at %L",
1577 if (sym
->attr
.flavor
!= FL_PROCEDURE
1578 && sym
->attr
.flavor
!= FL_UNKNOWN
)
1581 if (sym
->attr
.in_common
&& !sym
->attr
.proc_pointer
)
1583 if (!gfc_add_flavor (&sym
->attr
, FL_VARIABLE
,
1584 sym
->name
, &sym
->declared_at
))
1589 /* If the symbol is a function with itself as the result and
1590 is being defined, then we have a variable. */
1591 if (sym
->attr
.function
&& sym
->result
== sym
)
1593 if (gfc_is_function_return_value (sym
, gfc_current_ns
))
1597 && (sym
->ns
== gfc_current_ns
1598 || sym
->ns
== gfc_current_ns
->parent
))
1600 gfc_entry_list
*el
= NULL
;
1602 for (el
= sym
->ns
->entries
; el
; el
= el
->next
)
1612 e
= gfc_get_expr (); /* Leave it unknown for now */
1613 e
->symtree
= symtree
;
1614 e
->expr_type
= EXPR_VARIABLE
;
1615 e
->ts
.type
= BT_PROCEDURE
;
1622 gfc_current_locus
= where
;
1623 return gfc_match_expr (result
);
1627 /* Match a keyword argument or type parameter spec list.. */
1630 match_keyword_arg (gfc_actual_arglist
*actual
, gfc_actual_arglist
*base
, bool pdt
)
1632 char name
[GFC_MAX_SYMBOL_LEN
+ 1];
1633 gfc_actual_arglist
*a
;
1637 name_locus
= gfc_current_locus
;
1638 m
= gfc_match_name (name
);
1642 if (gfc_match_char ('=') != MATCH_YES
)
1650 if (gfc_match_char ('*') == MATCH_YES
)
1652 actual
->spec_type
= SPEC_ASSUMED
;
1655 else if (gfc_match_char (':') == MATCH_YES
)
1657 actual
->spec_type
= SPEC_DEFERRED
;
1661 actual
->spec_type
= SPEC_EXPLICIT
;
1664 m
= match_actual_arg (&actual
->expr
);
1668 /* Make sure this name has not appeared yet. */
1670 if (name
[0] != '\0')
1672 for (a
= base
; a
; a
= a
->next
)
1673 if (a
->name
!= NULL
&& strcmp (a
->name
, name
) == 0)
1675 gfc_error ("Keyword %qs at %C has already appeared in the "
1676 "current argument list", name
);
1681 actual
->name
= gfc_get_string ("%s", name
);
1685 gfc_current_locus
= name_locus
;
1690 /* Match an argument list function, such as %VAL. */
1693 match_arg_list_function (gfc_actual_arglist
*result
)
1695 char name
[GFC_MAX_SYMBOL_LEN
+ 1];
1699 old_locus
= gfc_current_locus
;
1701 if (gfc_match_char ('%') != MATCH_YES
)
1707 m
= gfc_match ("%n (", name
);
1711 if (name
[0] != '\0')
1716 if (strncmp (name
, "loc", 3) == 0)
1718 result
->name
= "%LOC";
1723 if (strncmp (name
, "ref", 3) == 0)
1725 result
->name
= "%REF";
1730 if (strncmp (name
, "val", 3) == 0)
1732 result
->name
= "%VAL";
1742 if (!gfc_notify_std (GFC_STD_GNU
, "argument list function at %C"))
1748 m
= match_actual_arg (&result
->expr
);
1752 if (gfc_match_char (')') != MATCH_YES
)
1761 gfc_current_locus
= old_locus
;
1766 /* Matches an actual argument list of a function or subroutine, from
1767 the opening parenthesis to the closing parenthesis. The argument
1768 list is assumed to allow keyword arguments because we don't know if
1769 the symbol associated with the procedure has an implicit interface
1770 or not. We make sure keywords are unique. If sub_flag is set,
1771 we're matching the argument list of a subroutine.
1773 NOTE: An alternative use for this function is to match type parameter
1774 spec lists, which are so similar to actual argument lists that the
1775 machinery can be reused. This use is flagged by the optional argument
1779 gfc_match_actual_arglist (int sub_flag
, gfc_actual_arglist
**argp
, bool pdt
)
1781 gfc_actual_arglist
*head
, *tail
;
1783 gfc_st_label
*label
;
1787 *argp
= tail
= NULL
;
1788 old_loc
= gfc_current_locus
;
1792 if (gfc_match_char ('(') == MATCH_NO
)
1793 return (sub_flag
) ? MATCH_YES
: MATCH_NO
;
1795 if (gfc_match_char (')') == MATCH_YES
)
1800 matching_actual_arglist
++;
1805 head
= tail
= gfc_get_actual_arglist ();
1808 tail
->next
= gfc_get_actual_arglist ();
1812 if (sub_flag
&& !pdt
&& gfc_match_char ('*') == MATCH_YES
)
1814 m
= gfc_match_st_label (&label
);
1816 gfc_error ("Expected alternate return label at %C");
1820 if (!gfc_notify_std (GFC_STD_F95_OBS
, "Alternate-return argument "
1824 tail
->label
= label
;
1828 if (pdt
&& !seen_keyword
)
1830 if (gfc_match_char (':') == MATCH_YES
)
1832 tail
->spec_type
= SPEC_DEFERRED
;
1835 else if (gfc_match_char ('*') == MATCH_YES
)
1837 tail
->spec_type
= SPEC_ASSUMED
;
1841 tail
->spec_type
= SPEC_EXPLICIT
;
1843 m
= match_keyword_arg (tail
, head
, pdt
);
1849 if (m
== MATCH_ERROR
)
1853 /* After the first keyword argument is seen, the following
1854 arguments must also have keywords. */
1857 m
= match_keyword_arg (tail
, head
, pdt
);
1859 if (m
== MATCH_ERROR
)
1863 gfc_error ("Missing keyword name in actual argument list at %C");
1870 /* Try an argument list function, like %VAL. */
1871 m
= match_arg_list_function (tail
);
1872 if (m
== MATCH_ERROR
)
1875 /* See if we have the first keyword argument. */
1878 m
= match_keyword_arg (tail
, head
, false);
1881 if (m
== MATCH_ERROR
)
1887 /* Try for a non-keyword argument. */
1888 m
= match_actual_arg (&tail
->expr
);
1889 if (m
== MATCH_ERROR
)
1898 if (gfc_match_char (')') == MATCH_YES
)
1900 if (gfc_match_char (',') != MATCH_YES
)
1905 matching_actual_arglist
--;
1909 gfc_error ("Syntax error in argument list at %C");
1912 gfc_free_actual_arglist (head
);
1913 gfc_current_locus
= old_loc
;
1914 matching_actual_arglist
--;
1919 /* Used by gfc_match_varspec() to extend the reference list by one
1923 extend_ref (gfc_expr
*primary
, gfc_ref
*tail
)
1925 if (primary
->ref
== NULL
)
1926 primary
->ref
= tail
= gfc_get_ref ();
1930 gfc_internal_error ("extend_ref(): Bad tail");
1931 tail
->next
= gfc_get_ref ();
1939 /* Match any additional specifications associated with the current
1940 variable like member references or substrings. If equiv_flag is
1941 set we only match stuff that is allowed inside an EQUIVALENCE
1942 statement. sub_flag tells whether we expect a type-bound procedure found
1943 to be a subroutine as part of CALL or a FUNCTION. For procedure pointer
1944 components, 'ppc_arg' determines whether the PPC may be called (with an
1945 argument list), or whether it may just be referred to as a pointer. */
1948 gfc_match_varspec (gfc_expr
*primary
, int equiv_flag
, bool sub_flag
,
1951 char name
[GFC_MAX_SYMBOL_LEN
+ 1];
1952 gfc_ref
*substring
, *tail
, *tmp
;
1953 gfc_component
*component
;
1954 gfc_symbol
*sym
= primary
->symtree
->n
.sym
;
1955 gfc_expr
*tgt_expr
= NULL
;
1962 gfc_gobble_whitespace ();
1964 if (gfc_peek_ascii_char () == '[')
1966 if ((sym
->ts
.type
!= BT_CLASS
&& sym
->attr
.dimension
)
1967 || (sym
->ts
.type
== BT_CLASS
&& CLASS_DATA (sym
)
1968 && CLASS_DATA (sym
)->attr
.dimension
))
1970 gfc_error ("Array section designator, e.g. '(:)', is required "
1971 "besides the coarray designator '[...]' at %C");
1974 if ((sym
->ts
.type
!= BT_CLASS
&& !sym
->attr
.codimension
)
1975 || (sym
->ts
.type
== BT_CLASS
&& CLASS_DATA (sym
)
1976 && !CLASS_DATA (sym
)->attr
.codimension
))
1978 gfc_error ("Coarray designator at %C but %qs is not a coarray",
1984 if (sym
->assoc
&& sym
->assoc
->target
)
1985 tgt_expr
= sym
->assoc
->target
;
1987 /* For associate names, we may not yet know whether they are arrays or not.
1988 If the selector expression is unambiguously an array; eg. a full array
1989 or an array section, then the associate name must be an array and we can
1990 fix it now. Otherwise, if parentheses follow and it is not a character
1991 type, we have to assume that it actually is one for now. The final
1992 decision will be made at resolution, of course. */
1994 && gfc_peek_ascii_char () == '('
1995 && sym
->ts
.type
!= BT_CLASS
1996 && !sym
->attr
.dimension
)
1998 gfc_ref
*ref
= NULL
;
2000 if (!sym
->assoc
->dangling
&& tgt_expr
)
2002 if (tgt_expr
->expr_type
== EXPR_VARIABLE
)
2003 gfc_resolve_expr (tgt_expr
);
2005 ref
= tgt_expr
->ref
;
2006 for (; ref
; ref
= ref
->next
)
2007 if (ref
->type
== REF_ARRAY
2008 && (ref
->u
.ar
.type
== AR_FULL
2009 || ref
->u
.ar
.type
== AR_SECTION
))
2013 if (ref
|| (!(sym
->assoc
->dangling
|| sym
->ts
.type
== BT_CHARACTER
)
2015 && sym
->assoc
->st
->n
.sym
2016 && sym
->assoc
->st
->n
.sym
->attr
.dimension
== 0))
2018 sym
->attr
.dimension
= 1;
2021 && sym
->assoc
->st
->n
.sym
2022 && sym
->assoc
->st
->n
.sym
->as
)
2023 sym
->as
= gfc_copy_array_spec (sym
->assoc
->st
->n
.sym
->as
);
2026 else if (sym
->ts
.type
== BT_CLASS
2028 && tgt_expr
->expr_type
== EXPR_VARIABLE
2029 && sym
->ts
.u
.derived
!= tgt_expr
->ts
.u
.derived
)
2031 gfc_resolve_expr (tgt_expr
);
2033 sym
->ts
.u
.derived
= tgt_expr
->ts
.u
.derived
;
2036 if ((equiv_flag
&& gfc_peek_ascii_char () == '(')
2037 || gfc_peek_ascii_char () == '[' || sym
->attr
.codimension
2038 || (sym
->attr
.dimension
&& sym
->ts
.type
!= BT_CLASS
2039 && !sym
->attr
.proc_pointer
&& !gfc_is_proc_ptr_comp (primary
)
2040 && !(gfc_matching_procptr_assignment
2041 && sym
->attr
.flavor
== FL_PROCEDURE
))
2042 || (sym
->ts
.type
== BT_CLASS
&& sym
->attr
.class_ok
2043 && (CLASS_DATA (sym
)->attr
.dimension
2044 || CLASS_DATA (sym
)->attr
.codimension
)))
2048 tail
= extend_ref (primary
, tail
);
2049 tail
->type
= REF_ARRAY
;
2051 /* In EQUIVALENCE, we don't know yet whether we are seeing
2052 an array, character variable or array of character
2053 variables. We'll leave the decision till resolve time. */
2057 else if (sym
->ts
.type
== BT_CLASS
&& CLASS_DATA (sym
))
2058 as
= CLASS_DATA (sym
)->as
;
2062 m
= gfc_match_array_ref (&tail
->u
.ar
, as
, equiv_flag
,
2063 as
? as
->corank
: 0);
2067 gfc_gobble_whitespace ();
2068 if (equiv_flag
&& gfc_peek_ascii_char () == '(')
2070 tail
= extend_ref (primary
, tail
);
2071 tail
->type
= REF_ARRAY
;
2073 m
= gfc_match_array_ref (&tail
->u
.ar
, NULL
, equiv_flag
, 0);
2079 primary
->ts
= sym
->ts
;
2084 /* With DEC extensions, member separator may be '.' or '%'. */
2085 sep
= gfc_peek_ascii_char ();
2086 m
= gfc_match_member_sep (sym
);
2087 if (m
== MATCH_ERROR
)
2090 if (sym
->ts
.type
== BT_UNKNOWN
&& m
== MATCH_YES
2091 && gfc_get_default_type (sym
->name
, sym
->ns
)->type
== BT_DERIVED
)
2092 gfc_set_default_type (sym
, 0, sym
->ns
);
2094 /* See if there is a usable typespec in the "no IMPLICIT type" error. */
2095 if (sym
->ts
.type
== BT_UNKNOWN
&& m
== MATCH_YES
)
2099 /* These target expressions can be resolved at any time. */
2100 permissible
= tgt_expr
&& tgt_expr
->symtree
&& tgt_expr
->symtree
->n
.sym
2101 && (tgt_expr
->symtree
->n
.sym
->attr
.use_assoc
2102 || tgt_expr
->symtree
->n
.sym
->attr
.host_assoc
2103 || tgt_expr
->symtree
->n
.sym
->attr
.if_source
2105 permissible
= permissible
2106 || (tgt_expr
&& tgt_expr
->expr_type
== EXPR_OP
);
2110 gfc_resolve_expr (tgt_expr
);
2111 sym
->ts
= tgt_expr
->ts
;
2114 if (sym
->ts
.type
== BT_UNKNOWN
)
2116 gfc_error ("Symbol %qs at %C has no IMPLICIT type", sym
->name
);
2120 else if ((sym
->ts
.type
!= BT_DERIVED
&& sym
->ts
.type
!= BT_CLASS
)
2123 gfc_error ("Unexpected %<%c%> for nonderived-type variable %qs at %C",
2128 if ((sym
->ts
.type
!= BT_DERIVED
&& sym
->ts
.type
!= BT_CLASS
)
2130 goto check_substring
;
2132 sym
= sym
->ts
.u
.derived
;
2139 m
= gfc_match_name (name
);
2141 gfc_error ("Expected structure component name at %C");
2145 if (sym
&& sym
->f2k_derived
)
2146 tbp
= gfc_find_typebound_proc (sym
, &t
, name
, false, &gfc_current_locus
);
2152 gfc_symbol
* tbp_sym
;
2157 gcc_assert (!tail
|| !tail
->next
);
2159 if (!(primary
->expr_type
== EXPR_VARIABLE
2160 || (primary
->expr_type
== EXPR_STRUCTURE
2161 && primary
->symtree
&& primary
->symtree
->n
.sym
2162 && primary
->symtree
->n
.sym
->attr
.flavor
)))
2165 if (tbp
->n
.tb
->is_generic
)
2168 tbp_sym
= tbp
->n
.tb
->u
.specific
->n
.sym
;
2170 primary
->expr_type
= EXPR_COMPCALL
;
2171 primary
->value
.compcall
.tbp
= tbp
->n
.tb
;
2172 primary
->value
.compcall
.name
= tbp
->name
;
2173 primary
->value
.compcall
.ignore_pass
= 0;
2174 primary
->value
.compcall
.assign
= 0;
2175 primary
->value
.compcall
.base_object
= NULL
;
2176 gcc_assert (primary
->symtree
->n
.sym
->attr
.referenced
);
2178 primary
->ts
= tbp_sym
->ts
;
2180 gfc_clear_ts (&primary
->ts
);
2182 m
= gfc_match_actual_arglist (tbp
->n
.tb
->subroutine
,
2183 &primary
->value
.compcall
.actual
);
2184 if (m
== MATCH_ERROR
)
2189 primary
->value
.compcall
.actual
= NULL
;
2192 gfc_error ("Expected argument list at %C");
2200 component
= gfc_find_component (sym
, name
, false, false, &tmp
);
2201 if (component
== NULL
)
2204 /* Extend the reference chain determined by gfc_find_component. */
2205 if (primary
->ref
== NULL
)
2209 /* Set by the for loop below for the last component ref. */
2210 gcc_assert (tail
!= NULL
);
2214 /* The reference chain may be longer than one hop for union
2215 subcomponents; find the new tail. */
2216 for (tail
= tmp
; tail
->next
; tail
= tail
->next
)
2219 primary
->ts
= component
->ts
;
2221 if (component
->attr
.proc_pointer
&& ppc_arg
)
2223 /* Procedure pointer component call: Look for argument list. */
2224 m
= gfc_match_actual_arglist (sub_flag
,
2225 &primary
->value
.compcall
.actual
);
2226 if (m
== MATCH_ERROR
)
2229 if (m
== MATCH_NO
&& !gfc_matching_ptr_assignment
2230 && !gfc_matching_procptr_assignment
&& !matching_actual_arglist
)
2232 gfc_error ("Procedure pointer component %qs requires an "
2233 "argument list at %C", component
->name
);
2238 primary
->expr_type
= EXPR_PPC
;
2243 if (component
->as
!= NULL
&& !component
->attr
.proc_pointer
)
2245 tail
= extend_ref (primary
, tail
);
2246 tail
->type
= REF_ARRAY
;
2248 m
= gfc_match_array_ref (&tail
->u
.ar
, component
->as
, equiv_flag
,
2249 component
->as
->corank
);
2253 else if (component
->ts
.type
== BT_CLASS
&& component
->attr
.class_ok
2254 && CLASS_DATA (component
)->as
&& !component
->attr
.proc_pointer
)
2256 tail
= extend_ref (primary
, tail
);
2257 tail
->type
= REF_ARRAY
;
2259 m
= gfc_match_array_ref (&tail
->u
.ar
, CLASS_DATA (component
)->as
,
2261 CLASS_DATA (component
)->as
->corank
);
2266 if ((component
->ts
.type
!= BT_DERIVED
&& component
->ts
.type
!= BT_CLASS
)
2267 || gfc_match_member_sep (component
->ts
.u
.derived
) != MATCH_YES
)
2270 sym
= component
->ts
.u
.derived
;
2275 if (primary
->ts
.type
== BT_UNKNOWN
&& !gfc_fl_struct (sym
->attr
.flavor
))
2277 if (gfc_get_default_type (sym
->name
, sym
->ns
)->type
== BT_CHARACTER
)
2279 gfc_set_default_type (sym
, 0, sym
->ns
);
2280 primary
->ts
= sym
->ts
;
2285 if (primary
->ts
.type
== BT_CHARACTER
)
2287 bool def
= primary
->ts
.deferred
== 1;
2288 switch (match_substring (primary
->ts
.u
.cl
, equiv_flag
, &substring
, def
))
2292 primary
->ref
= substring
;
2294 tail
->next
= substring
;
2296 if (primary
->expr_type
== EXPR_CONSTANT
)
2297 primary
->expr_type
= EXPR_SUBSTRING
;
2300 primary
->ts
.u
.cl
= NULL
;
2307 gfc_clear_ts (&primary
->ts
);
2308 gfc_clear_ts (&sym
->ts
);
2318 if (primary
->ts
.type
== BT_DERIVED
&& primary
->ref
2319 && primary
->ts
.u
.derived
&& primary
->ts
.u
.derived
->attr
.abstract
)
2321 gfc_error ("Nonpolymorphic reference to abstract type at %C");
2326 if (primary
->expr_type
== EXPR_PPC
&& gfc_is_coindexed (primary
))
2328 gfc_error ("Coindexed procedure-pointer component at %C");
2336 /* Given an expression that is a variable, figure out what the
2337 ultimate variable's type and attribute is, traversing the reference
2338 structures if necessary.
2340 This subroutine is trickier than it looks. We start at the base
2341 symbol and store the attribute. Component references load a
2342 completely new attribute.
2344 A couple of rules come into play. Subobjects of targets are always
2345 targets themselves. If we see a component that goes through a
2346 pointer, then the expression must also be a target, since the
2347 pointer is associated with something (if it isn't core will soon be
2348 dumped). If we see a full part or section of an array, the
2349 expression is also an array.
2351 We can have at most one full array reference. */
2354 gfc_variable_attr (gfc_expr
*expr
, gfc_typespec
*ts
)
2356 int dimension
, codimension
, pointer
, allocatable
, target
;
2357 symbol_attribute attr
;
2360 gfc_component
*comp
;
2362 if (expr
->expr_type
!= EXPR_VARIABLE
&& expr
->expr_type
!= EXPR_FUNCTION
)
2363 gfc_internal_error ("gfc_variable_attr(): Expression isn't a variable");
2365 sym
= expr
->symtree
->n
.sym
;
2368 if (sym
->ts
.type
== BT_CLASS
&& sym
->attr
.class_ok
)
2370 dimension
= CLASS_DATA (sym
)->attr
.dimension
;
2371 codimension
= CLASS_DATA (sym
)->attr
.codimension
;
2372 pointer
= CLASS_DATA (sym
)->attr
.class_pointer
;
2373 allocatable
= CLASS_DATA (sym
)->attr
.allocatable
;
2377 dimension
= attr
.dimension
;
2378 codimension
= attr
.codimension
;
2379 pointer
= attr
.pointer
;
2380 allocatable
= attr
.allocatable
;
2383 target
= attr
.target
;
2384 if (pointer
|| attr
.proc_pointer
)
2387 if (ts
!= NULL
&& expr
->ts
.type
== BT_UNKNOWN
)
2390 for (ref
= expr
->ref
; ref
; ref
= ref
->next
)
2395 switch (ref
->u
.ar
.type
)
2402 allocatable
= pointer
= 0;
2407 /* Handle coarrays. */
2408 if (ref
->u
.ar
.dimen
> 0)
2409 allocatable
= pointer
= 0;
2413 /* If any of start, end or stride is not integer, there will
2414 already have been an error issued. */
2416 gfc_get_errors (NULL
, &errors
);
2418 gfc_internal_error ("gfc_variable_attr(): Bad array reference");
2424 comp
= ref
->u
.c
.component
;
2429 /* Don't set the string length if a substring reference
2431 if (ts
->type
== BT_CHARACTER
2432 && ref
->next
&& ref
->next
->type
== REF_SUBSTRING
)
2436 if (comp
->ts
.type
== BT_CLASS
)
2438 codimension
= CLASS_DATA (comp
)->attr
.codimension
;
2439 pointer
= CLASS_DATA (comp
)->attr
.class_pointer
;
2440 allocatable
= CLASS_DATA (comp
)->attr
.allocatable
;
2444 codimension
= comp
->attr
.codimension
;
2445 pointer
= comp
->attr
.pointer
;
2446 allocatable
= comp
->attr
.allocatable
;
2448 if (pointer
|| attr
.proc_pointer
)
2454 allocatable
= pointer
= 0;
2458 attr
.dimension
= dimension
;
2459 attr
.codimension
= codimension
;
2460 attr
.pointer
= pointer
;
2461 attr
.allocatable
= allocatable
;
2462 attr
.target
= target
;
2463 attr
.save
= sym
->attr
.save
;
2469 /* Return the attribute from a general expression. */
2472 gfc_expr_attr (gfc_expr
*e
)
2474 symbol_attribute attr
;
2476 switch (e
->expr_type
)
2479 attr
= gfc_variable_attr (e
, NULL
);
2483 gfc_clear_attr (&attr
);
2485 if (e
->value
.function
.esym
&& e
->value
.function
.esym
->result
)
2487 gfc_symbol
*sym
= e
->value
.function
.esym
->result
;
2489 if (sym
->ts
.type
== BT_CLASS
)
2491 attr
.dimension
= CLASS_DATA (sym
)->attr
.dimension
;
2492 attr
.pointer
= CLASS_DATA (sym
)->attr
.class_pointer
;
2493 attr
.allocatable
= CLASS_DATA (sym
)->attr
.allocatable
;
2496 else if (e
->value
.function
.isym
2497 && e
->value
.function
.isym
->transformational
2498 && e
->ts
.type
== BT_CLASS
)
2499 attr
= CLASS_DATA (e
)->attr
;
2501 attr
= gfc_variable_attr (e
, NULL
);
2503 /* TODO: NULL() returns pointers. May have to take care of this
2509 gfc_clear_attr (&attr
);
2517 /* Given an expression, figure out what the ultimate expression
2518 attribute is. This routine is similar to gfc_variable_attr with
2519 parts of gfc_expr_attr, but focuses more on the needs of
2520 coarrays. For coarrays a codimension attribute is kind of
2521 "infectious" being propagated once set and never cleared.
2522 The coarray_comp is only set, when the expression refs a coarray
2523 component. REFS_COMP is set when present to true only, when this EXPR
2524 refs a (non-_data) component. To check whether EXPR refs an allocatable
2525 component in a derived type coarray *refs_comp needs to be set and
2526 coarray_comp has to false. */
2528 static symbol_attribute
2529 caf_variable_attr (gfc_expr
*expr
, bool in_allocate
, bool *refs_comp
)
2531 int dimension
, codimension
, pointer
, allocatable
, target
, coarray_comp
;
2532 symbol_attribute attr
;
2535 gfc_component
*comp
;
2537 if (expr
->expr_type
!= EXPR_VARIABLE
&& expr
->expr_type
!= EXPR_FUNCTION
)
2538 gfc_internal_error ("gfc_caf_attr(): Expression isn't a variable");
2540 sym
= expr
->symtree
->n
.sym
;
2541 gfc_clear_attr (&attr
);
2546 if (sym
->ts
.type
== BT_CLASS
&& sym
->attr
.class_ok
)
2548 dimension
= CLASS_DATA (sym
)->attr
.dimension
;
2549 codimension
= CLASS_DATA (sym
)->attr
.codimension
;
2550 pointer
= CLASS_DATA (sym
)->attr
.class_pointer
;
2551 allocatable
= CLASS_DATA (sym
)->attr
.allocatable
;
2552 attr
.alloc_comp
= CLASS_DATA (sym
)->ts
.u
.derived
->attr
.alloc_comp
;
2553 attr
.pointer_comp
= CLASS_DATA (sym
)->ts
.u
.derived
->attr
.pointer_comp
;
2557 dimension
= sym
->attr
.dimension
;
2558 codimension
= sym
->attr
.codimension
;
2559 pointer
= sym
->attr
.pointer
;
2560 allocatable
= sym
->attr
.allocatable
;
2561 attr
.alloc_comp
= sym
->ts
.type
== BT_DERIVED
2562 ? sym
->ts
.u
.derived
->attr
.alloc_comp
: 0;
2563 attr
.pointer_comp
= sym
->ts
.type
== BT_DERIVED
2564 ? sym
->ts
.u
.derived
->attr
.pointer_comp
: 0;
2567 target
= coarray_comp
= 0;
2568 if (pointer
|| attr
.proc_pointer
)
2571 for (ref
= expr
->ref
; ref
; ref
= ref
->next
)
2576 switch (ref
->u
.ar
.type
)
2584 /* Handle coarrays. */
2585 if (ref
->u
.ar
.dimen
> 0 && !in_allocate
)
2586 allocatable
= pointer
= 0;
2590 /* If any of start, end or stride is not integer, there will
2591 already have been an error issued. */
2593 gfc_get_errors (NULL
, &errors
);
2595 gfc_internal_error ("gfc_caf_attr(): Bad array reference");
2601 comp
= ref
->u
.c
.component
;
2603 if (comp
->ts
.type
== BT_CLASS
)
2605 /* Set coarray_comp only, when this component introduces the
2607 coarray_comp
= !codimension
&& CLASS_DATA (comp
)->attr
.codimension
;
2608 codimension
|= CLASS_DATA (comp
)->attr
.codimension
;
2609 pointer
= CLASS_DATA (comp
)->attr
.class_pointer
;
2610 allocatable
= CLASS_DATA (comp
)->attr
.allocatable
;
2614 /* Set coarray_comp only, when this component introduces the
2616 coarray_comp
= !codimension
&& comp
->attr
.codimension
;
2617 codimension
|= comp
->attr
.codimension
;
2618 pointer
= comp
->attr
.pointer
;
2619 allocatable
= comp
->attr
.allocatable
;
2622 if (refs_comp
&& strcmp (comp
->name
, "_data") != 0
2623 && (ref
->next
== NULL
2624 || (ref
->next
->type
== REF_ARRAY
&& ref
->next
->next
== NULL
)))
2627 if (pointer
|| attr
.proc_pointer
)
2633 allocatable
= pointer
= 0;
2637 attr
.dimension
= dimension
;
2638 attr
.codimension
= codimension
;
2639 attr
.pointer
= pointer
;
2640 attr
.allocatable
= allocatable
;
2641 attr
.target
= target
;
2642 attr
.save
= sym
->attr
.save
;
2643 attr
.coarray_comp
= coarray_comp
;
2650 gfc_caf_attr (gfc_expr
*e
, bool in_allocate
, bool *refs_comp
)
2652 symbol_attribute attr
;
2654 switch (e
->expr_type
)
2657 attr
= caf_variable_attr (e
, in_allocate
, refs_comp
);
2661 gfc_clear_attr (&attr
);
2663 if (e
->value
.function
.esym
&& e
->value
.function
.esym
->result
)
2665 gfc_symbol
*sym
= e
->value
.function
.esym
->result
;
2667 if (sym
->ts
.type
== BT_CLASS
)
2669 attr
.dimension
= CLASS_DATA (sym
)->attr
.dimension
;
2670 attr
.pointer
= CLASS_DATA (sym
)->attr
.class_pointer
;
2671 attr
.allocatable
= CLASS_DATA (sym
)->attr
.allocatable
;
2672 attr
.alloc_comp
= CLASS_DATA (sym
)->ts
.u
.derived
->attr
.alloc_comp
;
2673 attr
.pointer_comp
= CLASS_DATA (sym
)->ts
.u
.derived
2674 ->attr
.pointer_comp
;
2677 else if (e
->symtree
)
2678 attr
= caf_variable_attr (e
, in_allocate
, refs_comp
);
2680 gfc_clear_attr (&attr
);
2684 gfc_clear_attr (&attr
);
2692 /* Match a structure constructor. The initial symbol has already been
2695 typedef struct gfc_structure_ctor_component
2700 struct gfc_structure_ctor_component
* next
;
2702 gfc_structure_ctor_component
;
2704 #define gfc_get_structure_ctor_component() XCNEW (gfc_structure_ctor_component)
2707 gfc_free_structure_ctor_component (gfc_structure_ctor_component
*comp
)
2710 gfc_free_expr (comp
->val
);
2715 /* Translate the component list into the actual constructor by sorting it in
2716 the order required; this also checks along the way that each and every
2717 component actually has an initializer and handles default initializers
2718 for components without explicit value given. */
2720 build_actual_constructor (gfc_structure_ctor_component
**comp_head
,
2721 gfc_constructor_base
*ctor_head
, gfc_symbol
*sym
)
2723 gfc_structure_ctor_component
*comp_iter
;
2724 gfc_component
*comp
;
2726 for (comp
= sym
->components
; comp
; comp
= comp
->next
)
2728 gfc_structure_ctor_component
**next_ptr
;
2729 gfc_expr
*value
= NULL
;
2731 /* Try to find the initializer for the current component by name. */
2732 next_ptr
= comp_head
;
2733 for (comp_iter
= *comp_head
; comp_iter
; comp_iter
= comp_iter
->next
)
2735 if (!strcmp (comp_iter
->name
, comp
->name
))
2737 next_ptr
= &comp_iter
->next
;
2740 /* If an extension, try building the parent derived type by building
2741 a value expression for the parent derived type and calling self. */
2742 if (!comp_iter
&& comp
== sym
->components
&& sym
->attr
.extension
)
2744 value
= gfc_get_structure_constructor_expr (comp
->ts
.type
,
2746 &gfc_current_locus
);
2747 value
->ts
= comp
->ts
;
2749 if (!build_actual_constructor (comp_head
,
2750 &value
->value
.constructor
,
2751 comp
->ts
.u
.derived
))
2753 gfc_free_expr (value
);
2757 gfc_constructor_append_expr (ctor_head
, value
, NULL
);
2761 /* If it was not found, try the default initializer if there's any;
2762 otherwise, it's an error unless this is a deferred parameter. */
2765 if (comp
->initializer
)
2767 if (!gfc_notify_std (GFC_STD_F2003
, "Structure constructor "
2768 "with missing optional arguments at %C"))
2770 value
= gfc_copy_expr (comp
->initializer
);
2772 else if (comp
->attr
.allocatable
2773 || (comp
->ts
.type
== BT_CLASS
2774 && CLASS_DATA (comp
)->attr
.allocatable
))
2776 if (!gfc_notify_std (GFC_STD_F2008
, "No initializer for "
2777 "allocatable component %qs given in the "
2778 "structure constructor at %C", comp
->name
))
2781 else if (!comp
->attr
.artificial
)
2783 gfc_error ("No initializer for component %qs given in the"
2784 " structure constructor at %C", comp
->name
);
2789 value
= comp_iter
->val
;
2791 /* Add the value to the constructor chain built. */
2792 gfc_constructor_append_expr (ctor_head
, value
, NULL
);
2794 /* Remove the entry from the component list. We don't want the expression
2795 value to be free'd, so set it to NULL. */
2798 *next_ptr
= comp_iter
->next
;
2799 comp_iter
->val
= NULL
;
2800 gfc_free_structure_ctor_component (comp_iter
);
2808 gfc_convert_to_structure_constructor (gfc_expr
*e
, gfc_symbol
*sym
, gfc_expr
**cexpr
,
2809 gfc_actual_arglist
**arglist
,
2812 gfc_actual_arglist
*actual
;
2813 gfc_structure_ctor_component
*comp_tail
, *comp_head
, *comp_iter
;
2814 gfc_constructor_base ctor_head
= NULL
;
2815 gfc_component
*comp
; /* Is set NULL when named component is first seen */
2816 const char* last_name
= NULL
;
2820 expr
= parent
? *cexpr
: e
;
2821 old_locus
= gfc_current_locus
;
2823 ; /* gfc_current_locus = *arglist->expr ? ->where;*/
2825 gfc_current_locus
= expr
->where
;
2827 comp_tail
= comp_head
= NULL
;
2829 if (!parent
&& sym
->attr
.abstract
)
2831 gfc_error ("Can't construct ABSTRACT type %qs at %L",
2832 sym
->name
, &expr
->where
);
2836 comp
= sym
->components
;
2837 actual
= parent
? *arglist
: expr
->value
.function
.actual
;
2840 gfc_component
*this_comp
= NULL
;
2843 comp_tail
= comp_head
= gfc_get_structure_ctor_component ();
2846 comp_tail
->next
= gfc_get_structure_ctor_component ();
2847 comp_tail
= comp_tail
->next
;
2851 if (!gfc_notify_std (GFC_STD_F2003
, "Structure"
2852 " constructor with named arguments at %C"))
2855 comp_tail
->name
= xstrdup (actual
->name
);
2856 last_name
= comp_tail
->name
;
2861 /* Components without name are not allowed after the first named
2862 component initializer! */
2863 if (!comp
|| comp
->attr
.artificial
)
2866 gfc_error ("Component initializer without name after component"
2867 " named %s at %L", last_name
,
2868 actual
->expr
? &actual
->expr
->where
2869 : &gfc_current_locus
);
2871 gfc_error ("Too many components in structure constructor at "
2872 "%L", actual
->expr
? &actual
->expr
->where
2873 : &gfc_current_locus
);
2877 comp_tail
->name
= xstrdup (comp
->name
);
2880 /* Find the current component in the structure definition and check
2881 its access is not private. */
2883 this_comp
= gfc_find_component (sym
, comp
->name
, false, false, NULL
);
2886 this_comp
= gfc_find_component (sym
, (const char *)comp_tail
->name
,
2887 false, false, NULL
);
2888 comp
= NULL
; /* Reset needed! */
2891 /* Here we can check if a component name is given which does not
2892 correspond to any component of the defined structure. */
2896 /* For a constant string constructor, make sure the length is
2897 correct; truncate of fill with blanks if needed. */
2898 if (this_comp
->ts
.type
== BT_CHARACTER
&& !this_comp
->attr
.allocatable
2899 && this_comp
->ts
.u
.cl
&& this_comp
->ts
.u
.cl
->length
2900 && this_comp
->ts
.u
.cl
->length
->expr_type
== EXPR_CONSTANT
2901 && actual
->expr
->ts
.type
== BT_CHARACTER
2902 && actual
->expr
->expr_type
== EXPR_CONSTANT
)
2905 c
= gfc_mpz_get_hwi (this_comp
->ts
.u
.cl
->length
->value
.integer
);
2906 e
= actual
->expr
->value
.character
.length
;
2912 dest
= gfc_get_wide_string (c
+ 1);
2915 for (i
= 0; i
< to
; i
++)
2916 dest
[i
] = actual
->expr
->value
.character
.string
[i
];
2918 for (i
= e
; i
< c
; i
++)
2922 free (actual
->expr
->value
.character
.string
);
2924 actual
->expr
->value
.character
.length
= c
;
2925 actual
->expr
->value
.character
.string
= dest
;
2929 comp_tail
->val
= actual
->expr
;
2930 if (actual
->expr
!= NULL
)
2931 comp_tail
->where
= actual
->expr
->where
;
2932 actual
->expr
= NULL
;
2934 /* Check if this component is already given a value. */
2935 for (comp_iter
= comp_head
; comp_iter
!= comp_tail
;
2936 comp_iter
= comp_iter
->next
)
2938 gcc_assert (comp_iter
);
2939 if (!strcmp (comp_iter
->name
, comp_tail
->name
))
2941 gfc_error ("Component %qs is initialized twice in the structure"
2942 " constructor at %L", comp_tail
->name
,
2943 comp_tail
->val
? &comp_tail
->where
2944 : &gfc_current_locus
);
2949 /* F2008, R457/C725, for PURE C1283. */
2950 if (this_comp
->attr
.pointer
&& comp_tail
->val
2951 && gfc_is_coindexed (comp_tail
->val
))
2953 gfc_error ("Coindexed expression to pointer component %qs in "
2954 "structure constructor at %L", comp_tail
->name
,
2959 /* If not explicitly a parent constructor, gather up the components
2961 if (comp
&& comp
== sym
->components
2962 && sym
->attr
.extension
2964 && (!gfc_bt_struct (comp_tail
->val
->ts
.type
)
2966 comp_tail
->val
->ts
.u
.derived
!= this_comp
->ts
.u
.derived
))
2969 gfc_actual_arglist
*arg_null
= NULL
;
2971 actual
->expr
= comp_tail
->val
;
2972 comp_tail
->val
= NULL
;
2974 m
= gfc_convert_to_structure_constructor (NULL
,
2975 comp
->ts
.u
.derived
, &comp_tail
->val
,
2976 comp
->ts
.u
.derived
->attr
.zero_comp
2977 ? &arg_null
: &actual
, true);
2981 if (comp
->ts
.u
.derived
->attr
.zero_comp
)
2990 if (parent
&& !comp
)
2994 actual
= actual
->next
;
2997 if (!build_actual_constructor (&comp_head
, &ctor_head
, sym
))
3000 /* No component should be left, as this should have caused an error in the
3001 loop constructing the component-list (name that does not correspond to any
3002 component in the structure definition). */
3003 if (comp_head
&& sym
->attr
.extension
)
3005 for (comp_iter
= comp_head
; comp_iter
; comp_iter
= comp_iter
->next
)
3007 gfc_error ("component %qs at %L has already been set by a "
3008 "parent derived type constructor", comp_iter
->name
,
3014 gcc_assert (!comp_head
);
3018 expr
= gfc_get_structure_constructor_expr (BT_DERIVED
, 0, &gfc_current_locus
);
3019 expr
->ts
.u
.derived
= sym
;
3020 expr
->value
.constructor
= ctor_head
;
3025 expr
->ts
.u
.derived
= sym
;
3027 expr
->ts
.type
= BT_DERIVED
;
3028 expr
->value
.constructor
= ctor_head
;
3029 expr
->expr_type
= EXPR_STRUCTURE
;
3032 gfc_current_locus
= old_locus
;
3038 gfc_current_locus
= old_locus
;
3040 for (comp_iter
= comp_head
; comp_iter
; )
3042 gfc_structure_ctor_component
*next
= comp_iter
->next
;
3043 gfc_free_structure_ctor_component (comp_iter
);
3046 gfc_constructor_free (ctor_head
);
3053 gfc_match_structure_constructor (gfc_symbol
*sym
, gfc_expr
**result
)
3057 gfc_symtree
*symtree
;
3059 gfc_get_ha_sym_tree (sym
->name
, &symtree
);
3061 e
= gfc_get_expr ();
3062 e
->symtree
= symtree
;
3063 e
->expr_type
= EXPR_FUNCTION
;
3065 gcc_assert (gfc_fl_struct (sym
->attr
.flavor
)
3066 && symtree
->n
.sym
->attr
.flavor
== FL_PROCEDURE
);
3067 e
->value
.function
.esym
= sym
;
3068 e
->symtree
->n
.sym
->attr
.generic
= 1;
3070 m
= gfc_match_actual_arglist (0, &e
->value
.function
.actual
);
3077 if (!gfc_convert_to_structure_constructor (e
, sym
, NULL
, NULL
, false))
3083 /* If a structure constructor is in a DATA statement, then each entity
3084 in the structure constructor must be a constant. Try to reduce the
3086 if (gfc_in_match_data ())
3087 gfc_reduce_init_expr (e
);
3094 /* If the symbol is an implicit do loop index and implicitly typed,
3095 it should not be host associated. Provide a symtree from the
3096 current namespace. */
3098 check_for_implicit_index (gfc_symtree
**st
, gfc_symbol
**sym
)
3100 if ((*sym
)->attr
.flavor
== FL_VARIABLE
3101 && (*sym
)->ns
!= gfc_current_ns
3102 && (*sym
)->attr
.implied_index
3103 && (*sym
)->attr
.implicit_type
3104 && !(*sym
)->attr
.use_assoc
)
3107 i
= gfc_get_sym_tree ((*sym
)->name
, NULL
, st
, false);
3110 *sym
= (*st
)->n
.sym
;
3116 /* Procedure pointer as function result: Replace the function symbol by the
3117 auto-generated hidden result variable named "ppr@". */
3120 replace_hidden_procptr_result (gfc_symbol
**sym
, gfc_symtree
**st
)
3122 /* Check for procedure pointer result variable. */
3123 if ((*sym
)->attr
.function
&& !(*sym
)->attr
.external
3124 && (*sym
)->result
&& (*sym
)->result
!= *sym
3125 && (*sym
)->result
->attr
.proc_pointer
3126 && (*sym
) == gfc_current_ns
->proc_name
3127 && (*sym
) == (*sym
)->result
->ns
->proc_name
3128 && strcmp ("ppr@", (*sym
)->result
->name
) == 0)
3130 /* Automatic replacement with "hidden" result variable. */
3131 (*sym
)->result
->attr
.referenced
= (*sym
)->attr
.referenced
;
3132 *sym
= (*sym
)->result
;
3133 *st
= gfc_find_symtree ((*sym
)->ns
->sym_root
, (*sym
)->name
);
3140 /* Matches a variable name followed by anything that might follow it--
3141 array reference, argument list of a function, etc. */
3144 gfc_match_rvalue (gfc_expr
**result
)
3146 gfc_actual_arglist
*actual_arglist
;
3147 char name
[GFC_MAX_SYMBOL_LEN
+ 1], argname
[GFC_MAX_SYMBOL_LEN
+ 1];
3150 gfc_symtree
*symtree
;
3151 locus where
, old_loc
;
3159 m
= gfc_match ("%%loc");
3162 if (!gfc_notify_std (GFC_STD_LEGACY
, "%%LOC() as an rvalue at %C"))
3164 strncpy (name
, "loc", 4);
3169 m
= gfc_match_name (name
);
3174 /* Check if the symbol exists. */
3175 if (gfc_find_sym_tree (name
, NULL
, 1, &symtree
))
3178 /* If the symbol doesn't exist, create it unless the name matches a FL_STRUCT
3179 type. For derived types we create a generic symbol which links to the
3180 derived type symbol; STRUCTUREs are simpler and must not conflict with
3183 if (gfc_find_sym_tree (gfc_dt_upper_string (name
), NULL
, 1, &symtree
))
3185 if (!symtree
|| symtree
->n
.sym
->attr
.flavor
!= FL_STRUCT
)
3187 if (gfc_find_state (COMP_INTERFACE
)
3188 && !gfc_current_ns
->has_import_set
)
3189 i
= gfc_get_sym_tree (name
, NULL
, &symtree
, false);
3191 i
= gfc_get_ha_sym_tree (name
, &symtree
);
3197 sym
= symtree
->n
.sym
;
3199 where
= gfc_current_locus
;
3201 replace_hidden_procptr_result (&sym
, &symtree
);
3203 /* If this is an implicit do loop index and implicitly typed,
3204 it should not be host associated. */
3205 m
= check_for_implicit_index (&symtree
, &sym
);
3209 gfc_set_sym_referenced (sym
);
3210 sym
->attr
.implied_index
= 0;
3212 if (sym
->attr
.function
&& sym
->result
== sym
)
3214 /* See if this is a directly recursive function call. */
3215 gfc_gobble_whitespace ();
3216 if (sym
->attr
.recursive
3217 && gfc_peek_ascii_char () == '('
3218 && gfc_current_ns
->proc_name
== sym
3219 && !sym
->attr
.dimension
)
3221 gfc_error ("%qs at %C is the name of a recursive function "
3222 "and so refers to the result variable. Use an "
3223 "explicit RESULT variable for direct recursion "
3224 "(12.5.2.1)", sym
->name
);
3228 if (gfc_is_function_return_value (sym
, gfc_current_ns
))
3232 && (sym
->ns
== gfc_current_ns
3233 || sym
->ns
== gfc_current_ns
->parent
))
3235 gfc_entry_list
*el
= NULL
;
3237 for (el
= sym
->ns
->entries
; el
; el
= el
->next
)
3243 if (gfc_matching_procptr_assignment
)
3246 if (sym
->attr
.function
|| sym
->attr
.external
|| sym
->attr
.intrinsic
)
3249 if (sym
->attr
.generic
)
3250 goto generic_function
;
3252 switch (sym
->attr
.flavor
)
3256 e
= gfc_get_expr ();
3258 e
->expr_type
= EXPR_VARIABLE
;
3259 e
->symtree
= symtree
;
3261 m
= gfc_match_varspec (e
, 0, false, true);
3265 /* A statement of the form "REAL, parameter :: a(0:10) = 1" will
3266 end up here. Unfortunately, sym->value->expr_type is set to
3267 EXPR_CONSTANT, and so the if () branch would be followed without
3268 the !sym->as check. */
3269 if (sym
->value
&& sym
->value
->expr_type
!= EXPR_ARRAY
&& !sym
->as
)
3270 e
= gfc_copy_expr (sym
->value
);
3273 e
= gfc_get_expr ();
3274 e
->expr_type
= EXPR_VARIABLE
;
3277 e
->symtree
= symtree
;
3278 m
= gfc_match_varspec (e
, 0, false, true);
3280 if (sym
->ts
.is_c_interop
|| sym
->ts
.is_iso_c
)
3283 /* Variable array references to derived type parameters cause
3284 all sorts of headaches in simplification. Treating such
3285 expressions as variable works just fine for all array
3287 if (sym
->value
&& sym
->ts
.type
== BT_DERIVED
&& e
->ref
)
3289 for (ref
= e
->ref
; ref
; ref
= ref
->next
)
3290 if (ref
->type
== REF_ARRAY
)
3293 if (ref
== NULL
|| ref
->u
.ar
.type
== AR_FULL
)
3299 e
= gfc_get_expr ();
3300 e
->expr_type
= EXPR_VARIABLE
;
3301 e
->symtree
= symtree
;
3309 sym
= gfc_use_derived (sym
);
3313 goto generic_function
;
3316 /* If we're here, then the name is known to be the name of a
3317 procedure, yet it is not sure to be the name of a function. */
3320 /* Procedure Pointer Assignments. */
3322 if (gfc_matching_procptr_assignment
)
3324 gfc_gobble_whitespace ();
3325 if (!sym
->attr
.dimension
&& gfc_peek_ascii_char () == '(')
3326 /* Parse functions returning a procptr. */
3329 e
= gfc_get_expr ();
3330 e
->expr_type
= EXPR_VARIABLE
;
3331 e
->symtree
= symtree
;
3332 m
= gfc_match_varspec (e
, 0, false, true);
3333 if (!e
->ref
&& sym
->attr
.flavor
== FL_UNKNOWN
3334 && sym
->ts
.type
== BT_UNKNOWN
3335 && !gfc_add_flavor (&sym
->attr
, FL_PROCEDURE
, sym
->name
, NULL
))
3343 if (sym
->attr
.subroutine
)
3345 gfc_error ("Unexpected use of subroutine name %qs at %C",
3351 /* At this point, the name has to be a non-statement function.
3352 If the name is the same as the current function being
3353 compiled, then we have a variable reference (to the function
3354 result) if the name is non-recursive. */
3356 st
= gfc_enclosing_unit (NULL
);
3359 && st
->state
== COMP_FUNCTION
3361 && !sym
->attr
.recursive
)
3363 e
= gfc_get_expr ();
3364 e
->symtree
= symtree
;
3365 e
->expr_type
= EXPR_VARIABLE
;
3367 m
= gfc_match_varspec (e
, 0, false, true);
3371 /* Match a function reference. */
3373 m
= gfc_match_actual_arglist (0, &actual_arglist
);
3376 if (sym
->attr
.proc
== PROC_ST_FUNCTION
)
3377 gfc_error ("Statement function %qs requires argument list at %C",
3380 gfc_error ("Function %qs requires an argument list at %C",
3393 gfc_get_ha_sym_tree (name
, &symtree
); /* Can't fail */
3394 sym
= symtree
->n
.sym
;
3396 replace_hidden_procptr_result (&sym
, &symtree
);
3398 e
= gfc_get_expr ();
3399 e
->symtree
= symtree
;
3400 e
->expr_type
= EXPR_FUNCTION
;
3401 e
->value
.function
.actual
= actual_arglist
;
3402 e
->where
= gfc_current_locus
;
3404 if (sym
->ts
.type
== BT_CLASS
&& sym
->attr
.class_ok
3405 && CLASS_DATA (sym
)->as
)
3406 e
->rank
= CLASS_DATA (sym
)->as
->rank
;
3407 else if (sym
->as
!= NULL
)
3408 e
->rank
= sym
->as
->rank
;
3410 if (!sym
->attr
.function
3411 && !gfc_add_function (&sym
->attr
, sym
->name
, NULL
))
3417 /* Check here for the existence of at least one argument for the
3418 iso_c_binding functions C_LOC, C_FUNLOC, and C_ASSOCIATED. The
3419 argument(s) given will be checked in gfc_iso_c_func_interface,
3420 during resolution of the function call. */
3421 if (sym
->attr
.is_iso_c
== 1
3422 && (sym
->from_intmod
== INTMOD_ISO_C_BINDING
3423 && (sym
->intmod_sym_id
== ISOCBINDING_LOC
3424 || sym
->intmod_sym_id
== ISOCBINDING_FUNLOC
3425 || sym
->intmod_sym_id
== ISOCBINDING_ASSOCIATED
)))
3427 /* make sure we were given a param */
3428 if (actual_arglist
== NULL
)
3430 gfc_error ("Missing argument to %qs at %C", sym
->name
);
3436 if (sym
->result
== NULL
)
3439 gfc_gobble_whitespace ();
3441 if (gfc_peek_ascii_char() == '%')
3443 gfc_error ("The leftmost part-ref in a data-ref can not be a "
3444 "function reference at %C");
3453 /* Special case for derived type variables that get their types
3454 via an IMPLICIT statement. This can't wait for the
3455 resolution phase. */
3457 old_loc
= gfc_current_locus
;
3458 if (gfc_match_member_sep (sym
) == MATCH_YES
3459 && sym
->ts
.type
== BT_UNKNOWN
3460 && gfc_get_default_type (sym
->name
, sym
->ns
)->type
== BT_DERIVED
)
3461 gfc_set_default_type (sym
, 0, sym
->ns
);
3462 gfc_current_locus
= old_loc
;
3464 /* If the symbol has a (co)dimension attribute, the expression is a
3467 if (sym
->attr
.dimension
|| sym
->attr
.codimension
)
3469 if (!gfc_add_flavor (&sym
->attr
, FL_VARIABLE
, sym
->name
, NULL
))
3475 e
= gfc_get_expr ();
3476 e
->symtree
= symtree
;
3477 e
->expr_type
= EXPR_VARIABLE
;
3478 m
= gfc_match_varspec (e
, 0, false, true);
3482 if (sym
->ts
.type
== BT_CLASS
&& sym
->attr
.class_ok
3483 && (CLASS_DATA (sym
)->attr
.dimension
3484 || CLASS_DATA (sym
)->attr
.codimension
))
3486 if (!gfc_add_flavor (&sym
->attr
, FL_VARIABLE
, sym
->name
, NULL
))
3492 e
= gfc_get_expr ();
3493 e
->symtree
= symtree
;
3494 e
->expr_type
= EXPR_VARIABLE
;
3495 m
= gfc_match_varspec (e
, 0, false, true);
3499 /* Name is not an array, so we peek to see if a '(' implies a
3500 function call or a substring reference. Otherwise the
3501 variable is just a scalar. */
3503 gfc_gobble_whitespace ();
3504 if (gfc_peek_ascii_char () != '(')
3506 /* Assume a scalar variable */
3507 e
= gfc_get_expr ();
3508 e
->symtree
= symtree
;
3509 e
->expr_type
= EXPR_VARIABLE
;
3511 if (!gfc_add_flavor (&sym
->attr
, FL_VARIABLE
, sym
->name
, NULL
))
3517 /*FIXME:??? gfc_match_varspec does set this for us: */
3519 m
= gfc_match_varspec (e
, 0, false, true);
3523 /* See if this is a function reference with a keyword argument
3524 as first argument. We do this because otherwise a spurious
3525 symbol would end up in the symbol table. */
3527 old_loc
= gfc_current_locus
;
3528 m2
= gfc_match (" ( %n =", argname
);
3529 gfc_current_locus
= old_loc
;
3531 e
= gfc_get_expr ();
3532 e
->symtree
= symtree
;
3534 if (m2
!= MATCH_YES
)
3536 /* Try to figure out whether we're dealing with a character type.
3537 We're peeking ahead here, because we don't want to call
3538 match_substring if we're dealing with an implicitly typed
3539 non-character variable. */
3540 implicit_char
= false;
3541 if (sym
->ts
.type
== BT_UNKNOWN
)
3543 ts
= gfc_get_default_type (sym
->name
, NULL
);
3544 if (ts
->type
== BT_CHARACTER
)
3545 implicit_char
= true;
3548 /* See if this could possibly be a substring reference of a name
3549 that we're not sure is a variable yet. */
3551 if ((implicit_char
|| sym
->ts
.type
== BT_CHARACTER
)
3552 && match_substring (sym
->ts
.u
.cl
, 0, &e
->ref
, false) == MATCH_YES
)
3555 e
->expr_type
= EXPR_VARIABLE
;
3557 if (sym
->attr
.flavor
!= FL_VARIABLE
3558 && !gfc_add_flavor (&sym
->attr
, FL_VARIABLE
,
3565 if (sym
->ts
.type
== BT_UNKNOWN
3566 && !gfc_set_default_type (sym
, 1, NULL
))
3580 /* Give up, assume we have a function. */
3582 gfc_get_sym_tree (name
, NULL
, &symtree
, false); /* Can't fail */
3583 sym
= symtree
->n
.sym
;
3584 e
->expr_type
= EXPR_FUNCTION
;
3586 if (!sym
->attr
.function
3587 && !gfc_add_function (&sym
->attr
, sym
->name
, NULL
))
3595 m
= gfc_match_actual_arglist (0, &e
->value
.function
.actual
);
3597 gfc_error ("Missing argument list in function %qs at %C", sym
->name
);
3605 /* If our new function returns a character, array or structure
3606 type, it might have subsequent references. */
3608 m
= gfc_match_varspec (e
, 0, false, true);
3615 /* Look for symbol first; if not found, look for STRUCTURE type symbol
3616 specially. Creates a generic symbol for derived types. */
3617 gfc_find_sym_tree (name
, NULL
, 1, &symtree
);
3619 gfc_find_sym_tree (gfc_dt_upper_string (name
), NULL
, 1, &symtree
);
3620 if (!symtree
|| symtree
->n
.sym
->attr
.flavor
!= FL_STRUCT
)
3621 gfc_get_sym_tree (name
, NULL
, &symtree
, false); /* Can't fail */
3623 e
= gfc_get_expr ();
3624 e
->symtree
= symtree
;
3625 e
->expr_type
= EXPR_FUNCTION
;
3627 if (gfc_fl_struct (sym
->attr
.flavor
))
3629 e
->value
.function
.esym
= sym
;
3630 e
->symtree
->n
.sym
->attr
.generic
= 1;
3633 m
= gfc_match_actual_arglist (0, &e
->value
.function
.actual
);
3641 gfc_error ("Symbol at %C is not appropriate for an expression");
3657 /* Match a variable, i.e. something that can be assigned to. This
3658 starts as a symbol, can be a structure component or an array
3659 reference. It can be a function if the function doesn't have a
3660 separate RESULT variable. If the symbol has not been previously
3661 seen, we assume it is a variable.
3663 This function is called by two interface functions:
3664 gfc_match_variable, which has host_flag = 1, and
3665 gfc_match_equiv_variable, with host_flag = 0, to restrict the
3666 match of the symbol to the local scope. */
3669 match_variable (gfc_expr
**result
, int equiv_flag
, int host_flag
)
3671 gfc_symbol
*sym
, *dt_sym
;
3674 locus where
, old_loc
;
3677 /* Since nothing has any business being an lvalue in a module
3678 specification block, an interface block or a contains section,
3679 we force the changed_symbols mechanism to work by setting
3680 host_flag to 0. This prevents valid symbols that have the name
3681 of keywords, such as 'end', being turned into variables by
3682 failed matching to assignments for, e.g., END INTERFACE. */
3683 if (gfc_current_state () == COMP_MODULE
3684 || gfc_current_state () == COMP_SUBMODULE
3685 || gfc_current_state () == COMP_INTERFACE
3686 || gfc_current_state () == COMP_CONTAINS
)
3689 where
= gfc_current_locus
;
3690 m
= gfc_match_sym_tree (&st
, host_flag
);
3696 /* If this is an implicit do loop index and implicitly typed,
3697 it should not be host associated. */
3698 m
= check_for_implicit_index (&st
, &sym
);
3702 sym
->attr
.implied_index
= 0;
3704 gfc_set_sym_referenced (sym
);
3706 /* STRUCTUREs may share names with variables, but derived types may not. */
3707 if (sym
->attr
.flavor
== FL_PROCEDURE
&& sym
->generic
3708 && (dt_sym
= gfc_find_dt_in_generic (sym
)))
3710 if (dt_sym
->attr
.flavor
== FL_DERIVED
)
3711 gfc_error ("Derived type %qs cannot be used as a variable at %C",
3716 switch (sym
->attr
.flavor
)
3719 /* Everything is alright. */
3724 sym_flavor flavor
= FL_UNKNOWN
;
3726 gfc_gobble_whitespace ();
3728 if (sym
->attr
.external
|| sym
->attr
.procedure
3729 || sym
->attr
.function
|| sym
->attr
.subroutine
)
3730 flavor
= FL_PROCEDURE
;
3732 /* If it is not a procedure, is not typed and is host associated,
3733 we cannot give it a flavor yet. */
3734 else if (sym
->ns
== gfc_current_ns
->parent
3735 && sym
->ts
.type
== BT_UNKNOWN
)
3738 /* These are definitive indicators that this is a variable. */
3739 else if (gfc_peek_ascii_char () != '(' || sym
->ts
.type
!= BT_UNKNOWN
3740 || sym
->attr
.pointer
|| sym
->as
!= NULL
)
3741 flavor
= FL_VARIABLE
;
3743 if (flavor
!= FL_UNKNOWN
3744 && !gfc_add_flavor (&sym
->attr
, flavor
, sym
->name
, NULL
))
3752 gfc_error ("Named constant at %C in an EQUIVALENCE");
3755 /* Otherwise this is checked for and an error given in the
3756 variable definition context checks. */
3760 /* Check for a nonrecursive function result variable. */
3761 if (sym
->attr
.function
3762 && !sym
->attr
.external
3763 && sym
->result
== sym
3764 && (gfc_is_function_return_value (sym
, gfc_current_ns
)
3766 && sym
->ns
== gfc_current_ns
)
3768 && sym
->ns
== gfc_current_ns
->parent
)))
3770 /* If a function result is a derived type, then the derived
3771 type may still have to be resolved. */
3773 if (sym
->ts
.type
== BT_DERIVED
3774 && gfc_use_derived (sym
->ts
.u
.derived
) == NULL
)
3779 if (sym
->attr
.proc_pointer
3780 || replace_hidden_procptr_result (&sym
, &st
))
3783 /* Fall through to error */
3787 gfc_error ("%qs at %C is not a variable", sym
->name
);
3791 /* Special case for derived type variables that get their types
3792 via an IMPLICIT statement. This can't wait for the
3793 resolution phase. */
3796 gfc_namespace
* implicit_ns
;
3798 if (gfc_current_ns
->proc_name
== sym
)
3799 implicit_ns
= gfc_current_ns
;
3801 implicit_ns
= sym
->ns
;
3803 old_loc
= gfc_current_locus
;
3804 if (gfc_match_member_sep (sym
) == MATCH_YES
3805 && sym
->ts
.type
== BT_UNKNOWN
3806 && gfc_get_default_type (sym
->name
, implicit_ns
)->type
== BT_DERIVED
)
3807 gfc_set_default_type (sym
, 0, implicit_ns
);
3808 gfc_current_locus
= old_loc
;
3811 expr
= gfc_get_expr ();
3813 expr
->expr_type
= EXPR_VARIABLE
;
3816 expr
->where
= where
;
3818 /* Now see if we have to do more. */
3819 m
= gfc_match_varspec (expr
, equiv_flag
, false, false);
3822 gfc_free_expr (expr
);
3832 gfc_match_variable (gfc_expr
**result
, int equiv_flag
)
3834 return match_variable (result
, equiv_flag
, 1);
3839 gfc_match_equiv_variable (gfc_expr
**result
)
3841 return match_variable (result
, 1, 0);