1 /* Build expressions with type checking for C++ compiler.
2 Copyright (C) 1987-2023 Free Software Foundation, Inc.
3 Hacked by Michael Tiemann (tiemann@cygnus.com)
5 This file is part of GCC.
7 GCC is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3, or (at your option)
12 GCC is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
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/>. */
22 /* This file is part of the C++ front end.
23 It contains routines to build C++ expressions given their operands,
24 including computing the types of the result, C and C++ specific error
25 checks, and some optimization. */
29 #include "coretypes.h"
32 #include "stor-layout.h"
36 #include "c-family/c-objc.h"
37 #include "c-family/c-ubsan.h"
38 #include "gcc-rich-location.h"
39 #include "stringpool.h"
44 static tree
cp_build_addr_expr_strict (tree
, tsubst_flags_t
);
45 static tree
cp_build_function_call (tree
, tree
, tsubst_flags_t
);
46 static tree
pfn_from_ptrmemfunc (tree
);
47 static tree
delta_from_ptrmemfunc (tree
);
48 static tree
convert_for_assignment (tree
, tree
, impl_conv_rhs
, tree
, int,
50 static tree
cp_pointer_int_sum (location_t
, enum tree_code
, tree
, tree
,
52 static tree
rationalize_conditional_expr (enum tree_code
, tree
,
54 static bool comp_ptr_ttypes_real (tree
, tree
, int);
55 static bool comp_except_types (tree
, tree
, bool);
56 static bool comp_array_types (const_tree
, const_tree
, compare_bounds_t
, bool);
57 static tree
pointer_diff (location_t
, tree
, tree
, tree
, tsubst_flags_t
, tree
*);
58 static tree
get_delta_difference (tree
, tree
, bool, bool, tsubst_flags_t
);
59 static void casts_away_constness_r (tree
*, tree
*, tsubst_flags_t
);
60 static bool casts_away_constness (tree
, tree
, tsubst_flags_t
);
61 static bool maybe_warn_about_returning_address_of_local (tree
, location_t
= UNKNOWN_LOCATION
);
62 static void error_args_num (location_t
, tree
, bool);
63 static int convert_arguments (tree
, vec
<tree
, va_gc
> **, tree
, int,
65 static bool is_std_move_p (tree
);
66 static bool is_std_forward_p (tree
);
68 /* Do `exp = require_complete_type (exp);' to make sure exp
69 does not have an incomplete type. (That includes void types.)
70 Returns error_mark_node if the VALUE does not have
71 complete type when this function returns. */
74 require_complete_type (tree value
,
75 tsubst_flags_t complain
/* = tf_warning_or_error */)
79 if (processing_template_decl
|| value
== error_mark_node
)
82 if (TREE_CODE (value
) == OVERLOAD
)
83 type
= unknown_type_node
;
85 type
= TREE_TYPE (value
);
87 if (type
== error_mark_node
)
88 return error_mark_node
;
90 /* First, detect a valid value with a complete type. */
91 if (COMPLETE_TYPE_P (type
))
94 if (complete_type_or_maybe_complain (type
, value
, complain
))
97 return error_mark_node
;
100 /* Try to complete TYPE, if it is incomplete. For example, if TYPE is
101 a template instantiation, do the instantiation. Returns TYPE,
102 whether or not it could be completed, unless something goes
103 horribly wrong, in which case the error_mark_node is returned. */
106 complete_type (tree type
)
108 if (type
== NULL_TREE
)
109 /* Rather than crash, we return something sure to cause an error
111 return error_mark_node
;
113 if (type
== error_mark_node
|| COMPLETE_TYPE_P (type
))
115 else if (TREE_CODE (type
) == ARRAY_TYPE
)
117 tree t
= complete_type (TREE_TYPE (type
));
118 unsigned int needs_constructing
, has_nontrivial_dtor
;
119 if (COMPLETE_TYPE_P (t
) && !dependent_type_p (type
))
122 = TYPE_NEEDS_CONSTRUCTING (TYPE_MAIN_VARIANT (t
));
124 = TYPE_HAS_NONTRIVIAL_DESTRUCTOR (TYPE_MAIN_VARIANT (t
));
125 for (t
= TYPE_MAIN_VARIANT (type
); t
; t
= TYPE_NEXT_VARIANT (t
))
127 TYPE_NEEDS_CONSTRUCTING (t
) = needs_constructing
;
128 TYPE_HAS_NONTRIVIAL_DESTRUCTOR (t
) = has_nontrivial_dtor
;
131 else if (CLASS_TYPE_P (type
))
134 /* TYPE could be a class member we've not loaded the definition of. */
135 lazy_load_pendings (TYPE_NAME (TYPE_MAIN_VARIANT (type
)));
137 if (CLASSTYPE_TEMPLATE_INSTANTIATION (type
))
138 instantiate_class_template (TYPE_MAIN_VARIANT (type
));
144 /* Like complete_type, but issue an error if the TYPE cannot be completed.
145 VALUE is used for informative diagnostics.
146 Returns NULL_TREE if the type cannot be made complete. */
149 complete_type_or_maybe_complain (tree type
, tree value
, tsubst_flags_t complain
)
151 type
= complete_type (type
);
152 if (type
== error_mark_node
)
153 /* We already issued an error. */
155 else if (!COMPLETE_TYPE_P (type
))
157 if (complain
& tf_error
)
158 cxx_incomplete_type_diagnostic (value
, type
, DK_ERROR
);
159 note_failed_type_completion_for_satisfaction (type
);
167 complete_type_or_else (tree type
, tree value
)
169 return complete_type_or_maybe_complain (type
, value
, tf_warning_or_error
);
173 /* Return the common type of two parameter lists.
174 We assume that comptypes has already been done and returned 1;
175 if that isn't so, this may crash.
177 As an optimization, free the space we allocate if the parameter
178 lists are already common. */
181 commonparms (tree p1
, tree p2
)
183 tree oldargs
= p1
, newargs
, n
;
187 len
= list_length (p1
);
188 newargs
= tree_last (p1
);
190 if (newargs
== void_list_node
)
199 newargs
= tree_cons (NULL_TREE
, NULL_TREE
, newargs
);
204 p1
= TREE_CHAIN (p1
), p2
= TREE_CHAIN (p2
), n
= TREE_CHAIN (n
), i
++)
206 if (TREE_PURPOSE (p1
) && !TREE_PURPOSE (p2
))
208 TREE_PURPOSE (n
) = TREE_PURPOSE (p1
);
211 else if (! TREE_PURPOSE (p1
))
213 if (TREE_PURPOSE (p2
))
215 TREE_PURPOSE (n
) = TREE_PURPOSE (p2
);
221 if (simple_cst_equal (TREE_PURPOSE (p1
), TREE_PURPOSE (p2
)) != 1)
223 TREE_PURPOSE (n
) = TREE_PURPOSE (p2
);
225 if (TREE_VALUE (p1
) != TREE_VALUE (p2
))
228 TREE_VALUE (n
) = merge_types (TREE_VALUE (p1
), TREE_VALUE (p2
));
231 TREE_VALUE (n
) = TREE_VALUE (p1
);
239 /* Given a type, perhaps copied for a typedef,
240 find the "original" version of it. */
242 original_type (tree t
)
244 int quals
= cp_type_quals (t
);
245 while (t
!= error_mark_node
246 && TYPE_NAME (t
) != NULL_TREE
)
248 tree x
= TYPE_NAME (t
);
249 if (TREE_CODE (x
) != TYPE_DECL
)
251 x
= DECL_ORIGINAL_TYPE (x
);
256 return cp_build_qualified_type (t
, quals
);
259 /* Merge the attributes of type OTHER_TYPE into the attributes of type TYPE
260 and return a variant of TYPE with the merged attributes. */
263 merge_type_attributes_from (tree type
, tree other_type
)
265 tree attrs
= targetm
.merge_type_attributes (type
, other_type
);
266 attrs
= restrict_type_identity_attributes_to (attrs
, TYPE_ATTRIBUTES (type
));
267 return cp_build_type_attribute_variant (type
, attrs
);
270 /* Compare floating point conversion ranks and subranks of T1 and T2
271 types. If T1 and T2 have unordered conversion ranks, return 3.
272 If T1 has greater conversion rank than T2, return 2.
273 If T2 has greater conversion rank than T1, return -2.
274 If T1 has equal conversion rank as T2, return -1, 0 or 1 depending
275 on if T1 has smaller, equal or greater conversion subrank than
279 cp_compare_floating_point_conversion_ranks (tree t1
, tree t2
)
281 tree mv1
= TYPE_MAIN_VARIANT (t1
);
282 tree mv2
= TYPE_MAIN_VARIANT (t2
);
289 for (int i
= 0; i
< NUM_FLOATN_NX_TYPES
; ++i
)
291 if (mv1
== FLOATN_NX_TYPE_NODE (i
))
293 if (mv2
== FLOATN_NX_TYPE_NODE (i
))
296 if (mv1
== bfloat16_type_node
)
298 if (mv2
== bfloat16_type_node
)
300 if (extended2
&& !extended1
)
302 int ret
= cp_compare_floating_point_conversion_ranks (t2
, t1
);
303 return ret
== 3 ? 3 : -ret
;
306 const struct real_format
*fmt1
= REAL_MODE_FORMAT (TYPE_MODE (t1
));
307 const struct real_format
*fmt2
= REAL_MODE_FORMAT (TYPE_MODE (t2
));
308 gcc_assert (fmt1
->b
== 2 && fmt2
->b
== 2);
309 /* For {ibm,mips}_extended_format formats, the type has variable
310 precision up to ~2150 bits when the first double is around maximum
311 representable double and second double is subnormal minimum.
312 So, e.g. for __ibm128 vs. std::float128_t, they have unordered
314 int p1
= (MODE_COMPOSITE_P (TYPE_MODE (t1
))
315 ? fmt1
->emax
- fmt1
->emin
+ fmt1
->p
- 1 : fmt1
->p
);
316 int p2
= (MODE_COMPOSITE_P (TYPE_MODE (t2
))
317 ? fmt2
->emax
- fmt2
->emin
+ fmt2
->p
- 1 : fmt2
->p
);
318 /* The rank of a floating point type T is greater than the rank of
319 any floating-point type whose set of values is a proper subset
320 of the set of values of T. */
321 if ((p1
> p2
&& fmt1
->emax
>= fmt2
->emax
)
322 || (p1
== p2
&& fmt1
->emax
> fmt2
->emax
))
324 if ((p1
< p2
&& fmt1
->emax
<= fmt2
->emax
)
325 || (p1
== p2
&& fmt1
->emax
< fmt2
->emax
))
327 if ((p1
> p2
&& fmt1
->emax
< fmt2
->emax
)
328 || (p1
< p2
&& fmt1
->emax
> fmt2
->emax
))
330 if (!extended1
&& !extended2
)
332 /* The rank of long double is greater than the rank of double, which
333 is greater than the rank of float. */
334 if (t1
== long_double_type_node
)
336 else if (t2
== long_double_type_node
)
338 if (t1
== double_type_node
)
340 else if (t2
== double_type_node
)
342 if (t1
== float_type_node
)
344 else if (t2
== float_type_node
)
348 /* Two extended floating-point types with the same set of values have equal
350 if (extended1
&& extended2
)
352 if ((extended1
<= NUM_FLOATN_TYPES
) == (extended2
<= NUM_FLOATN_TYPES
))
354 /* Prefer higher extendedN value. */
355 if (extended1
> extended2
)
357 else if (extended1
< extended2
)
362 else if (extended1
<= NUM_FLOATN_TYPES
)
363 /* Prefer _FloatN type over _FloatMx type. */
365 else if (extended2
<= NUM_FLOATN_TYPES
)
371 /* gcc_assert (extended1 && !extended2); */
374 for (p
= &float_type_node
; p
<= &long_double_type_node
; ++p
)
376 const struct real_format
*fmt3
= REAL_MODE_FORMAT (TYPE_MODE (*p
));
377 gcc_assert (fmt3
->b
== 2);
378 int p3
= (MODE_COMPOSITE_P (TYPE_MODE (*p
))
379 ? fmt3
->emax
- fmt3
->emin
+ fmt3
->p
- 1 : fmt3
->p
);
380 if (p1
== p3
&& fmt1
->emax
== fmt3
->emax
)
383 /* An extended floating-point type with the same set of values
384 as exactly one cv-unqualified standard floating-point type
385 has a rank equal to the rank of that standard floating-point
388 An extended floating-point type with the same set of values
389 as more than one cv-unqualified standard floating-point type
390 has a rank equal to the rank of double.
392 Thus, if the latter is true and t2 is long double, t2
394 if (cnt
> 1 && mv2
== long_double_type_node
)
396 /* Otherwise, they have equal rank, but extended types
397 (other than std::bfloat16_t) have higher subrank.
398 std::bfloat16_t shouldn't have equal rank to any standard
399 floating point type. */
403 /* Return the common type for two arithmetic types T1 and T2 under the
404 usual arithmetic conversions. The default conversions have already
405 been applied, and enumerated types converted to their compatible
409 cp_common_type (tree t1
, tree t2
)
411 enum tree_code code1
= TREE_CODE (t1
);
412 enum tree_code code2
= TREE_CODE (t2
);
417 /* In what follows, we slightly generalize the rules given in [expr] so
418 as to deal with `long long' and `complex'. First, merge the
420 attributes
= (*targetm
.merge_type_attributes
) (t1
, t2
);
422 if (SCOPED_ENUM_P (t1
) || SCOPED_ENUM_P (t2
))
424 if (TYPE_MAIN_VARIANT (t1
) == TYPE_MAIN_VARIANT (t2
))
425 return build_type_attribute_variant (t1
, attributes
);
430 /* FIXME: Attributes. */
431 gcc_assert (ARITHMETIC_TYPE_P (t1
)
432 || VECTOR_TYPE_P (t1
)
433 || UNSCOPED_ENUM_P (t1
));
434 gcc_assert (ARITHMETIC_TYPE_P (t2
)
435 || VECTOR_TYPE_P (t2
)
436 || UNSCOPED_ENUM_P (t2
));
438 /* If one type is complex, form the common type of the non-complex
439 components, then make that complex. Use T1 or T2 if it is the
441 if (code1
== COMPLEX_TYPE
|| code2
== COMPLEX_TYPE
)
443 tree subtype1
= code1
== COMPLEX_TYPE
? TREE_TYPE (t1
) : t1
;
444 tree subtype2
= code2
== COMPLEX_TYPE
? TREE_TYPE (t2
) : t2
;
446 = type_after_usual_arithmetic_conversions (subtype1
, subtype2
);
448 if (subtype
== error_mark_node
)
450 if (code1
== COMPLEX_TYPE
&& TREE_TYPE (t1
) == subtype
)
451 return build_type_attribute_variant (t1
, attributes
);
452 else if (code2
== COMPLEX_TYPE
&& TREE_TYPE (t2
) == subtype
)
453 return build_type_attribute_variant (t2
, attributes
);
455 return build_type_attribute_variant (build_complex_type (subtype
),
459 if (code1
== VECTOR_TYPE
)
461 /* When we get here we should have two vectors of the same size.
462 Just prefer the unsigned one if present. */
463 if (TYPE_UNSIGNED (t1
))
464 return merge_type_attributes_from (t1
, t2
);
466 return merge_type_attributes_from (t2
, t1
);
469 /* If only one is real, use it as the result. */
470 if (code1
== REAL_TYPE
&& code2
!= REAL_TYPE
)
471 return build_type_attribute_variant (t1
, attributes
);
472 if (code2
== REAL_TYPE
&& code1
!= REAL_TYPE
)
473 return build_type_attribute_variant (t2
, attributes
);
475 if (code1
== REAL_TYPE
476 && (extended_float_type_p (t1
) || extended_float_type_p (t2
)))
478 tree mv1
= TYPE_MAIN_VARIANT (t1
);
479 tree mv2
= TYPE_MAIN_VARIANT (t2
);
481 return build_type_attribute_variant (t1
, attributes
);
483 int cmpret
= cp_compare_floating_point_conversion_ranks (mv1
, mv2
);
485 return error_mark_node
;
486 else if (cmpret
>= 0)
487 return build_type_attribute_variant (t1
, attributes
);
489 return build_type_attribute_variant (t2
, attributes
);
492 /* Both real or both integers; use the one with greater precision. */
493 if (TYPE_PRECISION (t1
) > TYPE_PRECISION (t2
))
494 return build_type_attribute_variant (t1
, attributes
);
495 else if (TYPE_PRECISION (t2
) > TYPE_PRECISION (t1
))
496 return build_type_attribute_variant (t2
, attributes
);
498 /* The types are the same; no need to do anything fancy. */
499 if (TYPE_MAIN_VARIANT (t1
) == TYPE_MAIN_VARIANT (t2
))
500 return build_type_attribute_variant (t1
, attributes
);
502 if (code1
!= REAL_TYPE
)
504 /* If one is unsigned long long, then convert the other to unsigned
506 if (same_type_p (TYPE_MAIN_VARIANT (t1
), long_long_unsigned_type_node
)
507 || same_type_p (TYPE_MAIN_VARIANT (t2
), long_long_unsigned_type_node
))
508 return build_type_attribute_variant (long_long_unsigned_type_node
,
510 /* If one is a long long, and the other is an unsigned long, and
511 long long can represent all the values of an unsigned long, then
512 convert to a long long. Otherwise, convert to an unsigned long
513 long. Otherwise, if either operand is long long, convert the
516 Since we're here, we know the TYPE_PRECISION is the same;
517 therefore converting to long long cannot represent all the values
518 of an unsigned long, so we choose unsigned long long in that
520 if (same_type_p (TYPE_MAIN_VARIANT (t1
), long_long_integer_type_node
)
521 || same_type_p (TYPE_MAIN_VARIANT (t2
), long_long_integer_type_node
))
523 tree t
= ((TYPE_UNSIGNED (t1
) || TYPE_UNSIGNED (t2
))
524 ? long_long_unsigned_type_node
525 : long_long_integer_type_node
);
526 return build_type_attribute_variant (t
, attributes
);
529 /* Go through the same procedure, but for longs. */
530 if (same_type_p (TYPE_MAIN_VARIANT (t1
), long_unsigned_type_node
)
531 || same_type_p (TYPE_MAIN_VARIANT (t2
), long_unsigned_type_node
))
532 return build_type_attribute_variant (long_unsigned_type_node
,
534 if (same_type_p (TYPE_MAIN_VARIANT (t1
), long_integer_type_node
)
535 || same_type_p (TYPE_MAIN_VARIANT (t2
), long_integer_type_node
))
537 tree t
= ((TYPE_UNSIGNED (t1
) || TYPE_UNSIGNED (t2
))
538 ? long_unsigned_type_node
: long_integer_type_node
);
539 return build_type_attribute_variant (t
, attributes
);
542 /* For __intN types, either the type is __int128 (and is lower
543 priority than the types checked above, but higher than other
544 128-bit types) or it's known to not be the same size as other
545 types (enforced in toplev.cc). Prefer the unsigned type. */
546 for (i
= 0; i
< NUM_INT_N_ENTS
; i
++)
548 if (int_n_enabled_p
[i
]
549 && (same_type_p (TYPE_MAIN_VARIANT (t1
), int_n_trees
[i
].signed_type
)
550 || same_type_p (TYPE_MAIN_VARIANT (t2
), int_n_trees
[i
].signed_type
)
551 || same_type_p (TYPE_MAIN_VARIANT (t1
), int_n_trees
[i
].unsigned_type
)
552 || same_type_p (TYPE_MAIN_VARIANT (t2
), int_n_trees
[i
].unsigned_type
)))
554 tree t
= ((TYPE_UNSIGNED (t1
) || TYPE_UNSIGNED (t2
))
555 ? int_n_trees
[i
].unsigned_type
556 : int_n_trees
[i
].signed_type
);
557 return build_type_attribute_variant (t
, attributes
);
561 /* Otherwise prefer the unsigned one. */
562 if (TYPE_UNSIGNED (t1
))
563 return build_type_attribute_variant (t1
, attributes
);
565 return build_type_attribute_variant (t2
, attributes
);
569 if (same_type_p (TYPE_MAIN_VARIANT (t1
), long_double_type_node
)
570 || same_type_p (TYPE_MAIN_VARIANT (t2
), long_double_type_node
))
571 return build_type_attribute_variant (long_double_type_node
,
573 if (same_type_p (TYPE_MAIN_VARIANT (t1
), double_type_node
)
574 || same_type_p (TYPE_MAIN_VARIANT (t2
), double_type_node
))
575 return build_type_attribute_variant (double_type_node
,
577 if (same_type_p (TYPE_MAIN_VARIANT (t1
), float_type_node
)
578 || same_type_p (TYPE_MAIN_VARIANT (t2
), float_type_node
))
579 return build_type_attribute_variant (float_type_node
,
582 /* Two floating-point types whose TYPE_MAIN_VARIANTs are none of
583 the standard C++ floating-point types. Logic earlier in this
584 function has already eliminated the possibility that
585 TYPE_PRECISION (t2) != TYPE_PRECISION (t1), so there's no
586 compelling reason to choose one or the other. */
587 return build_type_attribute_variant (t1
, attributes
);
591 /* T1 and T2 are arithmetic or enumeration types. Return the type
592 that will result from the "usual arithmetic conversions" on T1 and
593 T2 as described in [expr]. */
596 type_after_usual_arithmetic_conversions (tree t1
, tree t2
)
598 gcc_assert (ARITHMETIC_TYPE_P (t1
)
599 || VECTOR_TYPE_P (t1
)
600 || UNSCOPED_ENUM_P (t1
));
601 gcc_assert (ARITHMETIC_TYPE_P (t2
)
602 || VECTOR_TYPE_P (t2
)
603 || UNSCOPED_ENUM_P (t2
));
605 /* Perform the integral promotions. We do not promote real types here. */
606 if (INTEGRAL_OR_ENUMERATION_TYPE_P (t1
)
607 && INTEGRAL_OR_ENUMERATION_TYPE_P (t2
))
609 t1
= type_promotes_to (t1
);
610 t2
= type_promotes_to (t2
);
613 return cp_common_type (t1
, t2
);
617 composite_pointer_error (const op_location_t
&location
,
618 diagnostic_t kind
, tree t1
, tree t2
,
619 composite_pointer_operation operation
)
624 emit_diagnostic (kind
, location
, 0,
625 "comparison between "
626 "distinct pointer types %qT and %qT lacks a cast",
630 emit_diagnostic (kind
, location
, 0,
631 "conversion between "
632 "distinct pointer types %qT and %qT lacks a cast",
635 case CPO_CONDITIONAL_EXPR
:
636 emit_diagnostic (kind
, location
, 0,
637 "conditional expression between "
638 "distinct pointer types %qT and %qT lacks a cast",
646 /* Subroutine of composite_pointer_type to implement the recursive
647 case. See that function for documentation of the parameters. And ADD_CONST
648 is used to track adding "const" where needed. */
651 composite_pointer_type_r (const op_location_t
&location
,
652 tree t1
, tree t2
, bool *add_const
,
653 composite_pointer_operation operation
,
654 tsubst_flags_t complain
)
661 /* Determine the types pointed to by T1 and T2. */
664 pointee1
= TREE_TYPE (t1
);
665 pointee2
= TREE_TYPE (t2
);
669 pointee1
= TYPE_PTRMEM_POINTED_TO_TYPE (t1
);
670 pointee2
= TYPE_PTRMEM_POINTED_TO_TYPE (t2
);
675 If T1 and T2 are similar types, the result is the cv-combined type of
677 if (same_type_ignoring_top_level_qualifiers_p (pointee1
, pointee2
))
678 result_type
= pointee1
;
679 else if ((TYPE_PTR_P (pointee1
) && TYPE_PTR_P (pointee2
))
680 || (TYPE_PTRMEM_P (pointee1
) && TYPE_PTRMEM_P (pointee2
)))
682 result_type
= composite_pointer_type_r (location
, pointee1
, pointee2
,
683 add_const
, operation
, complain
);
684 if (result_type
== error_mark_node
)
685 return error_mark_node
;
689 if (complain
& tf_error
)
690 composite_pointer_error (location
, DK_PERMERROR
,
693 return error_mark_node
;
694 result_type
= void_type_node
;
696 const int q1
= cp_type_quals (pointee1
);
697 const int q2
= cp_type_quals (pointee2
);
698 const int quals
= q1
| q2
;
699 result_type
= cp_build_qualified_type (result_type
,
702 : TYPE_UNQUALIFIED
)));
703 /* The cv-combined type can add "const" as per [conv.qual]/3.3 (except for
704 the TLQ). The reason is that both T1 and T2 can then be converted to the
705 cv-combined type of T1 and T2. */
706 if (quals
!= q1
|| quals
!= q2
)
708 /* If the original types were pointers to members, so is the
710 if (TYPE_PTRMEM_P (t1
))
712 if (!same_type_p (TYPE_PTRMEM_CLASS_TYPE (t1
),
713 TYPE_PTRMEM_CLASS_TYPE (t2
)))
715 if (complain
& tf_error
)
716 composite_pointer_error (location
, DK_PERMERROR
,
719 return error_mark_node
;
721 result_type
= build_ptrmem_type (TYPE_PTRMEM_CLASS_TYPE (t1
),
725 result_type
= build_pointer_type (result_type
);
727 /* Merge the attributes. */
728 attributes
= (*targetm
.merge_type_attributes
) (t1
, t2
);
729 return build_type_attribute_variant (result_type
, attributes
);
732 /* Return the composite pointer type (see [expr.type]) for T1 and T2.
733 ARG1 and ARG2 are the values with those types. The OPERATION is to
734 describe the operation between the pointer types,
735 in case an error occurs.
737 This routine also implements the computation of a common type for
738 pointers-to-members as per [expr.eq]. */
741 composite_pointer_type (const op_location_t
&location
,
742 tree t1
, tree t2
, tree arg1
, tree arg2
,
743 composite_pointer_operation operation
,
744 tsubst_flags_t complain
)
751 If one operand is a null pointer constant, the composite pointer
752 type is the type of the other operand. */
753 if (null_ptr_cst_p (arg1
))
755 if (null_ptr_cst_p (arg2
))
762 If one of the operands has type "pointer to cv1 void", then
763 the other has type "pointer to cv2 T", and the composite pointer
764 type is "pointer to cv12 void", where cv12 is the union of cv1
767 If either type is a pointer to void, make sure it is T1. */
768 if (TYPE_PTR_P (t2
) && VOID_TYPE_P (TREE_TYPE (t2
)))
771 /* Now, if T1 is a pointer to void, merge the qualifiers. */
772 if (TYPE_PTR_P (t1
) && VOID_TYPE_P (TREE_TYPE (t1
)))
777 if (TYPE_PTRFN_P (t2
))
779 if (complain
& tf_error
)
784 pedwarn (location
, OPT_Wpedantic
,
785 "ISO C++ forbids comparison between pointer "
786 "of type %<void *%> and pointer-to-function");
789 pedwarn (location
, OPT_Wpedantic
,
790 "ISO C++ forbids conversion between pointer "
791 "of type %<void *%> and pointer-to-function");
793 case CPO_CONDITIONAL_EXPR
:
794 pedwarn (location
, OPT_Wpedantic
,
795 "ISO C++ forbids conditional expression between "
796 "pointer of type %<void *%> and "
797 "pointer-to-function");
804 return error_mark_node
;
807 = cp_build_qualified_type (void_type_node
,
808 (cp_type_quals (TREE_TYPE (t1
))
809 | cp_type_quals (TREE_TYPE (t2
))));
810 result_type
= build_pointer_type (result_type
);
811 /* Merge the attributes. */
812 attributes
= (*targetm
.merge_type_attributes
) (t1
, t2
);
813 return build_type_attribute_variant (result_type
, attributes
);
816 if (c_dialect_objc () && TYPE_PTR_P (t1
)
819 if (objc_have_common_type (t1
, t2
, -3, NULL_TREE
))
820 return objc_common_type (t1
, t2
);
823 /* if T1 or T2 is "pointer to noexcept function" and the other type is
824 "pointer to function", where the function types are otherwise the same,
825 "pointer to function" */
826 if (fnptr_conv_p (t1
, t2
))
828 if (fnptr_conv_p (t2
, t1
))
831 /* [expr.eq] permits the application of a pointer conversion to
832 bring the pointers to a common type. */
833 if (TYPE_PTR_P (t1
) && TYPE_PTR_P (t2
)
834 && CLASS_TYPE_P (TREE_TYPE (t1
))
835 && CLASS_TYPE_P (TREE_TYPE (t2
))
836 && !same_type_ignoring_top_level_qualifiers_p (TREE_TYPE (t1
),
839 class1
= TREE_TYPE (t1
);
840 class2
= TREE_TYPE (t2
);
842 if (DERIVED_FROM_P (class1
, class2
))
843 t2
= (build_pointer_type
844 (cp_build_qualified_type (class1
, cp_type_quals (class2
))));
845 else if (DERIVED_FROM_P (class2
, class1
))
846 t1
= (build_pointer_type
847 (cp_build_qualified_type (class2
, cp_type_quals (class1
))));
850 if (complain
& tf_error
)
851 composite_pointer_error (location
, DK_ERROR
, t1
, t2
, operation
);
852 return error_mark_node
;
855 /* [expr.eq] permits the application of a pointer-to-member
856 conversion to change the class type of one of the types. */
857 else if (TYPE_PTRMEM_P (t1
)
858 && !same_type_p (TYPE_PTRMEM_CLASS_TYPE (t1
),
859 TYPE_PTRMEM_CLASS_TYPE (t2
)))
861 class1
= TYPE_PTRMEM_CLASS_TYPE (t1
);
862 class2
= TYPE_PTRMEM_CLASS_TYPE (t2
);
864 if (DERIVED_FROM_P (class1
, class2
))
865 t1
= build_ptrmem_type (class2
, TYPE_PTRMEM_POINTED_TO_TYPE (t1
));
866 else if (DERIVED_FROM_P (class2
, class1
))
867 t2
= build_ptrmem_type (class1
, TYPE_PTRMEM_POINTED_TO_TYPE (t2
));
870 if (complain
& tf_error
)
874 error_at (location
, "comparison between distinct "
875 "pointer-to-member types %qT and %qT lacks a cast",
879 error_at (location
, "conversion between distinct "
880 "pointer-to-member types %qT and %qT lacks a cast",
883 case CPO_CONDITIONAL_EXPR
:
884 error_at (location
, "conditional expression between distinct "
885 "pointer-to-member types %qT and %qT lacks a cast",
891 return error_mark_node
;
895 bool add_const
= false;
896 return composite_pointer_type_r (location
, t1
, t2
, &add_const
, operation
,
900 /* Return the merged type of two types.
901 We assume that comptypes has already been done and returned 1;
902 if that isn't so, this may crash.
904 This just combines attributes and default arguments; any other
905 differences would cause the two types to compare unalike. */
908 merge_types (tree t1
, tree t2
)
910 enum tree_code code1
;
911 enum tree_code code2
;
914 /* Save time if the two types are the same. */
917 if (original_type (t1
) == original_type (t2
))
920 /* If one type is nonsense, use the other. */
921 if (t1
== error_mark_node
)
923 if (t2
== error_mark_node
)
926 /* Handle merging an auto redeclaration with a previous deduced
931 /* Merge the attributes. */
932 attributes
= (*targetm
.merge_type_attributes
) (t1
, t2
);
934 if (TYPE_PTRMEMFUNC_P (t1
))
935 t1
= TYPE_PTRMEMFUNC_FN_TYPE (t1
);
936 if (TYPE_PTRMEMFUNC_P (t2
))
937 t2
= TYPE_PTRMEMFUNC_FN_TYPE (t2
);
939 code1
= TREE_CODE (t1
);
940 code2
= TREE_CODE (t2
);
943 gcc_assert (code1
== TYPENAME_TYPE
|| code2
== TYPENAME_TYPE
);
944 if (code1
== TYPENAME_TYPE
)
946 t1
= resolve_typename_type (t1
, /*only_current_p=*/true);
947 code1
= TREE_CODE (t1
);
951 t2
= resolve_typename_type (t2
, /*only_current_p=*/true);
952 code2
= TREE_CODE (t2
);
960 /* For two pointers, do this recursively on the target type. */
962 tree target
= merge_types (TREE_TYPE (t1
), TREE_TYPE (t2
));
963 int quals
= cp_type_quals (t1
);
965 if (code1
== POINTER_TYPE
)
967 t1
= build_pointer_type (target
);
968 if (TREE_CODE (target
) == METHOD_TYPE
)
969 t1
= build_ptrmemfunc_type (t1
);
972 t1
= cp_build_reference_type (target
, TYPE_REF_IS_RVALUE (t1
));
973 t1
= build_type_attribute_variant (t1
, attributes
);
974 t1
= cp_build_qualified_type (t1
, quals
);
983 quals
= cp_type_quals (t1
);
984 pointee
= merge_types (TYPE_PTRMEM_POINTED_TO_TYPE (t1
),
985 TYPE_PTRMEM_POINTED_TO_TYPE (t2
));
986 t1
= build_ptrmem_type (TYPE_PTRMEM_CLASS_TYPE (t1
),
988 t1
= cp_build_qualified_type (t1
, quals
);
994 tree elt
= merge_types (TREE_TYPE (t1
), TREE_TYPE (t2
));
995 /* Save space: see if the result is identical to one of the args. */
996 if (elt
== TREE_TYPE (t1
) && TYPE_DOMAIN (t1
))
997 return build_type_attribute_variant (t1
, attributes
);
998 if (elt
== TREE_TYPE (t2
) && TYPE_DOMAIN (t2
))
999 return build_type_attribute_variant (t2
, attributes
);
1000 /* Merge the element types, and have a size if either arg has one. */
1001 t1
= build_cplus_array_type
1002 (elt
, TYPE_DOMAIN (TYPE_DOMAIN (t1
) ? t1
: t2
));
1007 /* Function types: prefer the one that specified arg types.
1008 If both do, merge the arg types. Also merge the return types. */
1010 tree valtype
= merge_types (TREE_TYPE (t1
), TREE_TYPE (t2
));
1011 tree p1
= TYPE_ARG_TYPES (t1
);
1012 tree p2
= TYPE_ARG_TYPES (t2
);
1015 /* Save space: see if the result is identical to one of the args. */
1016 if (valtype
== TREE_TYPE (t1
) && ! p2
)
1017 return cp_build_type_attribute_variant (t1
, attributes
);
1018 if (valtype
== TREE_TYPE (t2
) && ! p1
)
1019 return cp_build_type_attribute_variant (t2
, attributes
);
1021 /* Simple way if one arg fails to specify argument types. */
1022 if (p1
== NULL_TREE
|| TREE_VALUE (p1
) == void_type_node
)
1024 else if (p2
== NULL_TREE
|| TREE_VALUE (p2
) == void_type_node
)
1027 parms
= commonparms (p1
, p2
);
1029 cp_cv_quals quals
= type_memfn_quals (t1
);
1030 cp_ref_qualifier rqual
= type_memfn_rqual (t1
);
1031 gcc_assert (quals
== type_memfn_quals (t2
));
1032 gcc_assert (rqual
== type_memfn_rqual (t2
));
1034 tree rval
= build_function_type (valtype
, parms
);
1035 rval
= apply_memfn_quals (rval
, quals
);
1036 tree raises
= merge_exception_specifiers (TYPE_RAISES_EXCEPTIONS (t1
),
1037 TYPE_RAISES_EXCEPTIONS (t2
));
1038 bool late_return_type_p
= TYPE_HAS_LATE_RETURN_TYPE (t1
);
1039 t1
= build_cp_fntype_variant (rval
, rqual
, raises
, late_return_type_p
);
1045 /* Get this value the long way, since TYPE_METHOD_BASETYPE
1046 is just the main variant of this. */
1047 tree basetype
= class_of_this_parm (t2
);
1048 tree raises
= merge_exception_specifiers (TYPE_RAISES_EXCEPTIONS (t1
),
1049 TYPE_RAISES_EXCEPTIONS (t2
));
1050 cp_ref_qualifier rqual
= type_memfn_rqual (t1
);
1052 bool late_return_type_1_p
= TYPE_HAS_LATE_RETURN_TYPE (t1
);
1054 /* If this was a member function type, get back to the
1055 original type of type member function (i.e., without
1056 the class instance variable up front. */
1057 t1
= build_function_type (TREE_TYPE (t1
),
1058 TREE_CHAIN (TYPE_ARG_TYPES (t1
)));
1059 t2
= build_function_type (TREE_TYPE (t2
),
1060 TREE_CHAIN (TYPE_ARG_TYPES (t2
)));
1061 t3
= merge_types (t1
, t2
);
1062 t3
= build_method_type_directly (basetype
, TREE_TYPE (t3
),
1063 TYPE_ARG_TYPES (t3
));
1064 t1
= build_cp_fntype_variant (t3
, rqual
, raises
, late_return_type_1_p
);
1069 /* There is no need to merge attributes into a TYPENAME_TYPE.
1070 When the type is instantiated it will have whatever
1071 attributes result from the instantiation. */
1075 if (attribute_list_equal (TYPE_ATTRIBUTES (t1
), attributes
))
1077 else if (attribute_list_equal (TYPE_ATTRIBUTES (t2
), attributes
))
1082 return cp_build_type_attribute_variant (t1
, attributes
);
1085 /* Return the ARRAY_TYPE type without its domain. */
1088 strip_array_domain (tree type
)
1091 gcc_assert (TREE_CODE (type
) == ARRAY_TYPE
);
1092 if (TYPE_DOMAIN (type
) == NULL_TREE
)
1094 t2
= build_cplus_array_type (TREE_TYPE (type
), NULL_TREE
);
1095 return cp_build_type_attribute_variant (t2
, TYPE_ATTRIBUTES (type
));
1098 /* Wrapper around cp_common_type that is used by c-common.cc and other
1099 front end optimizations that remove promotions.
1101 Return the common type for two arithmetic types T1 and T2 under the
1102 usual arithmetic conversions. The default conversions have already
1103 been applied, and enumerated types converted to their compatible
1107 common_type (tree t1
, tree t2
)
1109 /* If one type is nonsense, use the other */
1110 if (t1
== error_mark_node
)
1112 if (t2
== error_mark_node
)
1115 return cp_common_type (t1
, t2
);
1118 /* Return the common type of two pointer types T1 and T2. This is the
1119 type for the result of most arithmetic operations if the operands
1120 have the given two types.
1122 We assume that comp_target_types has already been done and returned
1123 nonzero; if that isn't so, this may crash. */
1126 common_pointer_type (tree t1
, tree t2
)
1128 gcc_assert ((TYPE_PTR_P (t1
) && TYPE_PTR_P (t2
))
1129 || (TYPE_PTRDATAMEM_P (t1
) && TYPE_PTRDATAMEM_P (t2
))
1130 || (TYPE_PTRMEMFUNC_P (t1
) && TYPE_PTRMEMFUNC_P (t2
)));
1132 return composite_pointer_type (input_location
, t1
, t2
,
1133 error_mark_node
, error_mark_node
,
1134 CPO_CONVERSION
, tf_warning_or_error
);
1137 /* Compare two exception specifier types for exactness or subsetness, if
1138 allowed. Returns false for mismatch, true for match (same, or
1139 derived and !exact).
1141 [except.spec] "If a class X ... objects of class X or any class publicly
1142 and unambiguously derived from X. Similarly, if a pointer type Y * ...
1143 exceptions of type Y * or that are pointers to any type publicly and
1144 unambiguously derived from Y. Otherwise a function only allows exceptions
1145 that have the same type ..."
1146 This does not mention cv qualifiers and is different to what throw
1147 [except.throw] and catch [except.catch] will do. They will ignore the
1148 top level cv qualifiers, and allow qualifiers in the pointer to class
1151 We implement the letter of the standard. */
1154 comp_except_types (tree a
, tree b
, bool exact
)
1156 if (same_type_p (a
, b
))
1160 if (cp_type_quals (a
) || cp_type_quals (b
))
1163 if (TYPE_PTR_P (a
) && TYPE_PTR_P (b
))
1167 if (cp_type_quals (a
) || cp_type_quals (b
))
1171 if (TREE_CODE (a
) != RECORD_TYPE
1172 || TREE_CODE (b
) != RECORD_TYPE
)
1175 if (publicly_uniquely_derived_p (a
, b
))
1181 /* Return true if TYPE1 and TYPE2 are equivalent exception specifiers.
1182 If EXACT is ce_derived, T2 can be stricter than T1 (according to 15.4/5).
1183 If EXACT is ce_type, the C++17 type compatibility rules apply.
1184 If EXACT is ce_normal, the compatibility rules in 15.4/3 apply.
1185 If EXACT is ce_exact, the specs must be exactly the same. Exception lists
1186 are unordered, but we've already filtered out duplicates. Most lists will
1187 be in order, we should try to make use of that. */
1190 comp_except_specs (const_tree t1
, const_tree t2
, int exact
)
1199 /* First handle noexcept. */
1200 if (exact
< ce_exact
)
1202 if (exact
== ce_type
1203 && (canonical_eh_spec (CONST_CAST_TREE (t1
))
1204 == canonical_eh_spec (CONST_CAST_TREE (t2
))))
1207 /* noexcept(false) is compatible with no exception-specification,
1208 and less strict than any spec. */
1209 if (t1
== noexcept_false_spec
)
1210 return t2
== NULL_TREE
|| exact
== ce_derived
;
1211 /* Even a derived noexcept(false) is compatible with no
1212 exception-specification. */
1213 if (t2
== noexcept_false_spec
)
1214 return t1
== NULL_TREE
;
1216 /* Otherwise, if we aren't looking for an exact match, noexcept is
1217 equivalent to throw(). */
1218 if (t1
== noexcept_true_spec
)
1219 t1
= empty_except_spec
;
1220 if (t2
== noexcept_true_spec
)
1221 t2
= empty_except_spec
;
1224 /* If any noexcept is left, it is only comparable to itself;
1225 either we're looking for an exact match or we're redeclaring a
1226 template with dependent noexcept. */
1227 if ((t1
&& TREE_PURPOSE (t1
))
1228 || (t2
&& TREE_PURPOSE (t2
)))
1230 && cp_tree_equal (TREE_PURPOSE (t1
), TREE_PURPOSE (t2
)));
1232 if (t1
== NULL_TREE
) /* T1 is ... */
1233 return t2
== NULL_TREE
|| exact
== ce_derived
;
1234 if (!TREE_VALUE (t1
)) /* t1 is EMPTY */
1235 return t2
!= NULL_TREE
&& !TREE_VALUE (t2
);
1236 if (t2
== NULL_TREE
) /* T2 is ... */
1238 if (TREE_VALUE (t1
) && !TREE_VALUE (t2
)) /* T2 is EMPTY, T1 is not */
1239 return exact
== ce_derived
;
1241 /* Neither set is ... or EMPTY, make sure each part of T2 is in T1.
1242 Count how many we find, to determine exactness. For exact matching and
1243 ordered T1, T2, this is an O(n) operation, otherwise its worst case is
1245 for (base
= t1
; t2
!= NULL_TREE
; t2
= TREE_CHAIN (t2
))
1247 for (probe
= base
; probe
!= NULL_TREE
; probe
= TREE_CHAIN (probe
))
1249 tree a
= TREE_VALUE (probe
);
1250 tree b
= TREE_VALUE (t2
);
1252 if (comp_except_types (a
, b
, exact
))
1254 if (probe
== base
&& exact
> ce_derived
)
1255 base
= TREE_CHAIN (probe
);
1260 if (probe
== NULL_TREE
)
1263 return exact
== ce_derived
|| base
== NULL_TREE
|| length
== list_length (t1
);
1266 /* Compare the array types T1 and T2. CB says how we should behave when
1267 comparing array bounds: bounds_none doesn't allow dimensionless arrays,
1268 bounds_either says than any array can be [], bounds_first means that
1269 onlt T1 can be an array with unknown bounds. STRICT is true if
1270 qualifiers must match when comparing the types of the array elements. */
1273 comp_array_types (const_tree t1
, const_tree t2
, compare_bounds_t cb
,
1283 /* The type of the array elements must be the same. */
1285 ? !same_type_p (TREE_TYPE (t1
), TREE_TYPE (t2
))
1286 : !similar_type_p (TREE_TYPE (t1
), TREE_TYPE (t2
)))
1289 d1
= TYPE_DOMAIN (t1
);
1290 d2
= TYPE_DOMAIN (t2
);
1295 /* If one of the arrays is dimensionless, and the other has a
1296 dimension, they are of different types. However, it is valid to
1304 declarations for an array object can specify
1305 array types that differ by the presence or absence of a major
1306 array bound (_dcl.array_). */
1308 return cb
>= bounds_either
;
1310 return cb
== bounds_either
;
1312 /* Check that the dimensions are the same. */
1314 if (!cp_tree_equal (TYPE_MIN_VALUE (d1
), TYPE_MIN_VALUE (d2
)))
1316 max1
= TYPE_MAX_VALUE (d1
);
1317 max2
= TYPE_MAX_VALUE (d2
);
1319 if (!cp_tree_equal (max1
, max2
))
1325 /* Compare the relative position of T1 and T2 into their respective
1326 template parameter list.
1327 T1 and T2 must be template parameter types.
1328 Return TRUE if T1 and T2 have the same position, FALSE otherwise. */
1331 comp_template_parms_position (tree t1
, tree t2
)
1333 tree index1
, index2
;
1334 gcc_assert (t1
&& t2
1335 && TREE_CODE (t1
) == TREE_CODE (t2
)
1336 && (TREE_CODE (t1
) == BOUND_TEMPLATE_TEMPLATE_PARM
1337 || TREE_CODE (t1
) == TEMPLATE_TEMPLATE_PARM
1338 || TREE_CODE (t1
) == TEMPLATE_TYPE_PARM
));
1340 index1
= TEMPLATE_TYPE_PARM_INDEX (TYPE_MAIN_VARIANT (t1
));
1341 index2
= TEMPLATE_TYPE_PARM_INDEX (TYPE_MAIN_VARIANT (t2
));
1343 /* Then compare their relative position. */
1344 if (TEMPLATE_PARM_IDX (index1
) != TEMPLATE_PARM_IDX (index2
)
1345 || TEMPLATE_PARM_LEVEL (index1
) != TEMPLATE_PARM_LEVEL (index2
)
1346 || (TEMPLATE_PARM_PARAMETER_PACK (index1
)
1347 != TEMPLATE_PARM_PARAMETER_PACK (index2
)))
1350 /* In C++14 we can end up comparing 'auto' to a normal template
1351 parameter. Don't confuse them. */
1352 if (cxx_dialect
>= cxx14
&& (is_auto (t1
) || is_auto (t2
)))
1353 return TYPE_IDENTIFIER (t1
) == TYPE_IDENTIFIER (t2
);
1358 /* Heuristic check if two parameter types can be considered ABI-equivalent. */
1361 cxx_safe_arg_type_equiv_p (tree t1
, tree t2
)
1363 t1
= TYPE_MAIN_VARIANT (t1
);
1364 t2
= TYPE_MAIN_VARIANT (t2
);
1370 /* The signedness of the parameter matters only when an integral
1371 type smaller than int is promoted to int, otherwise only the
1372 precision of the parameter matters.
1373 This check should make sure that the callee does not see
1374 undefined values in argument registers. */
1375 if (INTEGRAL_TYPE_P (t1
)
1376 && INTEGRAL_TYPE_P (t2
)
1377 && TYPE_PRECISION (t1
) == TYPE_PRECISION (t2
)
1378 && (TYPE_UNSIGNED (t1
) == TYPE_UNSIGNED (t2
)
1379 || !targetm
.calls
.promote_prototypes (NULL_TREE
)
1380 || TYPE_PRECISION (t1
) >= TYPE_PRECISION (integer_type_node
)))
1383 return same_type_p (t1
, t2
);
1386 /* Check if a type cast between two function types can be considered safe. */
1389 cxx_safe_function_type_cast_p (tree t1
, tree t2
)
1391 if (TREE_TYPE (t1
) == void_type_node
&&
1392 TYPE_ARG_TYPES (t1
) == void_list_node
)
1395 if (TREE_TYPE (t2
) == void_type_node
&&
1396 TYPE_ARG_TYPES (t2
) == void_list_node
)
1399 if (!cxx_safe_arg_type_equiv_p (TREE_TYPE (t1
), TREE_TYPE (t2
)))
1402 for (t1
= TYPE_ARG_TYPES (t1
), t2
= TYPE_ARG_TYPES (t2
);
1404 t1
= TREE_CHAIN (t1
), t2
= TREE_CHAIN (t2
))
1405 if (!cxx_safe_arg_type_equiv_p (TREE_VALUE (t1
), TREE_VALUE (t2
)))
1411 /* Subroutine in comptypes. */
1414 structural_comptypes (tree t1
, tree t2
, int strict
)
1416 /* Both should be types that are not obviously the same. */
1417 gcc_checking_assert (t1
!= t2
&& TYPE_P (t1
) && TYPE_P (t2
));
1419 /* Suppress typename resolution under spec_hasher::equal in place of calling
1420 push_to_top_level there. */
1421 if (!comparing_specializations
)
1423 /* TYPENAME_TYPEs should be resolved if the qualifying scope is the
1424 current instantiation. */
1425 if (TREE_CODE (t1
) == TYPENAME_TYPE
)
1426 t1
= resolve_typename_type (t1
, /*only_current_p=*/true);
1428 if (TREE_CODE (t2
) == TYPENAME_TYPE
)
1429 t2
= resolve_typename_type (t2
, /*only_current_p=*/true);
1432 if (TYPE_PTRMEMFUNC_P (t1
))
1433 t1
= TYPE_PTRMEMFUNC_FN_TYPE (t1
);
1434 if (TYPE_PTRMEMFUNC_P (t2
))
1435 t2
= TYPE_PTRMEMFUNC_FN_TYPE (t2
);
1437 /* Different classes of types can't be compatible. */
1438 if (TREE_CODE (t1
) != TREE_CODE (t2
))
1441 /* Qualifiers must match. For array types, we will check when we
1442 recur on the array element types. */
1443 if (TREE_CODE (t1
) != ARRAY_TYPE
1444 && cp_type_quals (t1
) != cp_type_quals (t2
))
1446 if (TREE_CODE (t1
) == FUNCTION_TYPE
1447 && type_memfn_quals (t1
) != type_memfn_quals (t2
))
1449 /* Need to check this before TYPE_MAIN_VARIANT.
1450 FIXME function qualifiers should really change the main variant. */
1451 if (FUNC_OR_METHOD_TYPE_P (t1
))
1453 if (type_memfn_rqual (t1
) != type_memfn_rqual (t2
))
1455 if (flag_noexcept_type
1456 && !comp_except_specs (TYPE_RAISES_EXCEPTIONS (t1
),
1457 TYPE_RAISES_EXCEPTIONS (t2
),
1462 /* Allow for two different type nodes which have essentially the same
1463 definition. Note that we already checked for equality of the type
1464 qualifiers (just above). */
1465 if (TREE_CODE (t1
) != ARRAY_TYPE
1466 && TYPE_MAIN_VARIANT (t1
) == TYPE_MAIN_VARIANT (t2
))
1469 /* Compare the types. Return false on known not-same. Break on not
1470 known. Never return true from this switch -- you'll break
1471 specialization comparison. */
1472 switch (TREE_CODE (t1
))
1476 /* All void and bool types are the same. */
1481 case FIXED_POINT_TYPE
:
1483 /* With these nodes, we can't determine type equivalence by
1484 looking at what is stored in the nodes themselves, because
1485 two nodes might have different TYPE_MAIN_VARIANTs but still
1486 represent the same type. For example, wchar_t and int could
1487 have the same properties (TYPE_PRECISION, TYPE_MIN_VALUE,
1488 TYPE_MAX_VALUE, etc.), but have different TYPE_MAIN_VARIANTs
1489 and are distinct types. On the other hand, int and the
1492 typedef int INT __attribute((may_alias));
1494 have identical properties, different TYPE_MAIN_VARIANTs, but
1495 represent the same type. The canonical type system keeps
1496 track of equivalence in this case, so we fall back on it. */
1497 if (TYPE_CANONICAL (t1
) != TYPE_CANONICAL (t2
))
1500 /* We don't need or want the attribute comparison. */
1503 case TEMPLATE_TEMPLATE_PARM
:
1504 case BOUND_TEMPLATE_TEMPLATE_PARM
:
1505 if (!comp_template_parms_position (t1
, t2
))
1507 if (!comp_template_parms
1508 (DECL_TEMPLATE_PARMS (TEMPLATE_TEMPLATE_PARM_TEMPLATE_DECL (t1
)),
1509 DECL_TEMPLATE_PARMS (TEMPLATE_TEMPLATE_PARM_TEMPLATE_DECL (t2
))))
1511 if (TREE_CODE (t1
) == TEMPLATE_TEMPLATE_PARM
)
1513 /* Don't check inheritance. */
1514 strict
= COMPARE_STRICT
;
1519 if (TYPE_TEMPLATE_INFO (t1
) && TYPE_TEMPLATE_INFO (t2
)
1520 && (TYPE_TI_TEMPLATE (t1
) == TYPE_TI_TEMPLATE (t2
)
1521 || TREE_CODE (t1
) == BOUND_TEMPLATE_TEMPLATE_PARM
)
1522 && comp_template_args (TYPE_TI_ARGS (t1
), TYPE_TI_ARGS (t2
)))
1525 if ((strict
& COMPARE_BASE
) && DERIVED_FROM_P (t1
, t2
))
1527 else if ((strict
& COMPARE_DERIVED
) && DERIVED_FROM_P (t2
, t1
))
1533 if (!comptypes (TYPE_OFFSET_BASETYPE (t1
), TYPE_OFFSET_BASETYPE (t2
),
1534 strict
& ~COMPARE_REDECLARATION
))
1536 if (!same_type_p (TREE_TYPE (t1
), TREE_TYPE (t2
)))
1540 case REFERENCE_TYPE
:
1541 if (TYPE_REF_IS_RVALUE (t1
) != TYPE_REF_IS_RVALUE (t2
))
1543 /* fall through to checks for pointer types */
1547 if (TYPE_MODE (t1
) != TYPE_MODE (t2
)
1548 || !same_type_p (TREE_TYPE (t1
), TREE_TYPE (t2
)))
1554 /* Exception specs and memfn_rquals were checked above. */
1555 if (!same_type_p (TREE_TYPE (t1
), TREE_TYPE (t2
)))
1557 if (!compparms (TYPE_ARG_TYPES (t1
), TYPE_ARG_TYPES (t2
)))
1562 /* Target types must match incl. qualifiers. */
1563 if (!comp_array_types (t1
, t2
, ((strict
& COMPARE_REDECLARATION
)
1564 ? bounds_either
: bounds_none
),
1569 case TEMPLATE_TYPE_PARM
:
1570 /* If T1 and T2 don't have the same relative position in their
1571 template parameters set, they can't be equal. */
1572 if (!comp_template_parms_position (t1
, t2
))
1574 /* If T1 and T2 don't represent the same class template deduction,
1575 they aren't equal. */
1576 if (CLASS_PLACEHOLDER_TEMPLATE (t1
)
1577 != CLASS_PLACEHOLDER_TEMPLATE (t2
))
1579 /* Constrained 'auto's are distinct from parms that don't have the same
1581 if (!equivalent_placeholder_constraints (t1
, t2
))
1586 if (!cp_tree_equal (TYPENAME_TYPE_FULLNAME (t1
),
1587 TYPENAME_TYPE_FULLNAME (t2
)))
1589 /* Qualifiers don't matter on scopes. */
1590 if (!same_type_ignoring_top_level_qualifiers_p (TYPE_CONTEXT (t1
),
1595 case UNBOUND_CLASS_TEMPLATE
:
1596 if (!cp_tree_equal (TYPE_IDENTIFIER (t1
), TYPE_IDENTIFIER (t2
)))
1598 if (!same_type_p (TYPE_CONTEXT (t1
), TYPE_CONTEXT (t2
)))
1603 if (!same_type_p (TREE_TYPE (t1
), TREE_TYPE (t2
)))
1608 if (gnu_vector_type_p (t1
) != gnu_vector_type_p (t2
)
1609 || maybe_ne (TYPE_VECTOR_SUBPARTS (t1
), TYPE_VECTOR_SUBPARTS (t2
))
1610 || !same_type_p (TREE_TYPE (t1
), TREE_TYPE (t2
)))
1614 case TYPE_PACK_EXPANSION
:
1615 return (same_type_p (PACK_EXPANSION_PATTERN (t1
),
1616 PACK_EXPANSION_PATTERN (t2
))
1617 && comp_template_args (PACK_EXPANSION_EXTRA_ARGS (t1
),
1618 PACK_EXPANSION_EXTRA_ARGS (t2
)));
1621 if (DECLTYPE_TYPE_ID_EXPR_OR_MEMBER_ACCESS_P (t1
)
1622 != DECLTYPE_TYPE_ID_EXPR_OR_MEMBER_ACCESS_P (t2
))
1624 if (DECLTYPE_FOR_LAMBDA_CAPTURE (t1
) != DECLTYPE_FOR_LAMBDA_CAPTURE (t2
))
1626 if (DECLTYPE_FOR_LAMBDA_PROXY (t1
) != DECLTYPE_FOR_LAMBDA_PROXY (t2
))
1628 if (!cp_tree_equal (DECLTYPE_TYPE_EXPR (t1
), DECLTYPE_TYPE_EXPR (t2
)))
1633 if (TRAIT_TYPE_KIND (t1
) != TRAIT_TYPE_KIND (t2
))
1635 if (!cp_tree_equal (TRAIT_TYPE_TYPE1 (t1
), TRAIT_TYPE_TYPE1 (t2
))
1636 || !cp_tree_equal (TRAIT_TYPE_TYPE2 (t1
), TRAIT_TYPE_TYPE2 (t2
)))
1641 if (!cp_tree_equal (TYPEOF_TYPE_EXPR (t1
), TYPEOF_TYPE_EXPR (t2
)))
1649 /* If we get here, we know that from a target independent POV the
1650 types are the same. Make sure the target attributes are also
1652 if (!comp_type_attributes (t1
, t2
))
1656 if (comparing_dependent_aliases
)
1658 /* Don't treat an alias template specialization with dependent
1659 arguments as equivalent to its underlying type when used as a
1660 template argument; we need them to be distinct so that we
1661 substitute into the specialization arguments at instantiation
1662 time. And aliases can't be equivalent without being ==, so
1663 we don't need to look any deeper. */
1664 ++processing_template_decl
;
1665 tree dep1
= dependent_alias_template_spec_p (t1
, nt_transparent
);
1666 tree dep2
= dependent_alias_template_spec_p (t2
, nt_transparent
);
1667 --processing_template_decl
;
1668 if ((dep1
|| dep2
) && dep1
!= dep2
)
1675 /* Return true if T1 and T2 are related as allowed by STRICT. STRICT
1676 is a bitwise-or of the COMPARE_* flags. */
1679 comptypes (tree t1
, tree t2
, int strict
)
1681 gcc_checking_assert (t1
&& t2
);
1683 /* TYPE_ARGUMENT_PACKS are not really types. */
1684 gcc_checking_assert (TREE_CODE (t1
) != TYPE_ARGUMENT_PACK
1685 && TREE_CODE (t2
) != TYPE_ARGUMENT_PACK
);
1690 /* Suppress errors caused by previously reported errors. */
1691 if (t1
== error_mark_node
|| t2
== error_mark_node
)
1694 if (strict
== COMPARE_STRICT
)
1696 if (TYPE_STRUCTURAL_EQUALITY_P (t1
) || TYPE_STRUCTURAL_EQUALITY_P (t2
))
1697 /* At least one of the types requires structural equality, so
1698 perform a deep check. */
1699 return structural_comptypes (t1
, t2
, strict
);
1701 if (flag_checking
&& param_use_canonical_types
)
1703 bool result
= structural_comptypes (t1
, t2
, strict
);
1705 if (result
&& TYPE_CANONICAL (t1
) != TYPE_CANONICAL (t2
))
1706 /* The two types are structurally equivalent, but their
1707 canonical types were different. This is a failure of the
1708 canonical type propagation code.*/
1710 ("canonical types differ for identical types %qT and %qT",
1712 else if (!result
&& TYPE_CANONICAL (t1
) == TYPE_CANONICAL (t2
))
1713 /* Two types are structurally different, but the canonical
1714 types are the same. This means we were over-eager in
1715 assigning canonical types. */
1717 ("same canonical type node for different types %qT and %qT",
1722 if (!flag_checking
&& param_use_canonical_types
)
1723 return TYPE_CANONICAL (t1
) == TYPE_CANONICAL (t2
);
1725 return structural_comptypes (t1
, t2
, strict
);
1727 else if (strict
== COMPARE_STRUCTURAL
)
1728 return structural_comptypes (t1
, t2
, COMPARE_STRICT
);
1730 return structural_comptypes (t1
, t2
, strict
);
1733 /* Returns nonzero iff TYPE1 and TYPE2 are the same type, ignoring
1734 top-level qualifiers. */
1737 same_type_ignoring_top_level_qualifiers_p (tree type1
, tree type2
)
1739 if (type1
== error_mark_node
|| type2
== error_mark_node
)
1744 type1
= cp_build_qualified_type (type1
, TYPE_UNQUALIFIED
);
1745 type2
= cp_build_qualified_type (type2
, TYPE_UNQUALIFIED
);
1746 return same_type_p (type1
, type2
);
1749 /* Returns nonzero iff TYPE1 and TYPE2 are similar, as per [conv.qual]. */
1752 similar_type_p (tree type1
, tree type2
)
1754 if (type1
== error_mark_node
|| type2
== error_mark_node
)
1757 /* Informally, two types are similar if, ignoring top-level cv-qualification:
1758 * they are the same type; or
1759 * they are both pointers, and the pointed-to types are similar; or
1760 * they are both pointers to member of the same class, and the types of
1761 the pointed-to members are similar; or
1762 * they are both arrays of the same size or both arrays of unknown bound,
1763 and the array element types are similar. */
1765 if (same_type_ignoring_top_level_qualifiers_p (type1
, type2
))
1768 if ((TYPE_PTR_P (type1
) && TYPE_PTR_P (type2
))
1769 || (TYPE_PTRDATAMEM_P (type1
) && TYPE_PTRDATAMEM_P (type2
))
1770 || (TREE_CODE (type1
) == ARRAY_TYPE
&& TREE_CODE (type2
) == ARRAY_TYPE
))
1771 return comp_ptr_ttypes_const (type1
, type2
, bounds_either
);
1776 /* Helper function for layout_compatible_type_p and
1777 is_corresponding_member_aggr. Advance to next members (NULL if
1778 no further ones) and return true if those members are still part of
1779 the common initial sequence. */
1782 next_common_initial_sequence (tree
&memb1
, tree
&memb2
)
1786 if (TREE_CODE (memb1
) != FIELD_DECL
1787 || (DECL_FIELD_IS_BASE (memb1
) && is_empty_field (memb1
)))
1789 memb1
= DECL_CHAIN (memb1
);
1792 if (DECL_FIELD_IS_BASE (memb1
))
1794 memb1
= TYPE_FIELDS (TREE_TYPE (memb1
));
1801 if (TREE_CODE (memb2
) != FIELD_DECL
1802 || (DECL_FIELD_IS_BASE (memb2
) && is_empty_field (memb2
)))
1804 memb2
= DECL_CHAIN (memb2
);
1807 if (DECL_FIELD_IS_BASE (memb2
))
1809 memb2
= TYPE_FIELDS (TREE_TYPE (memb2
));
1814 if (memb1
== NULL_TREE
&& memb2
== NULL_TREE
)
1816 if (memb1
== NULL_TREE
|| memb2
== NULL_TREE
)
1818 if (DECL_BIT_FIELD_TYPE (memb1
))
1820 if (!DECL_BIT_FIELD_TYPE (memb2
))
1822 if (!layout_compatible_type_p (DECL_BIT_FIELD_TYPE (memb1
),
1823 DECL_BIT_FIELD_TYPE (memb2
)))
1825 if (TYPE_PRECISION (TREE_TYPE (memb1
))
1826 != TYPE_PRECISION (TREE_TYPE (memb2
)))
1829 else if (DECL_BIT_FIELD_TYPE (memb2
))
1831 else if (!layout_compatible_type_p (TREE_TYPE (memb1
), TREE_TYPE (memb2
)))
1833 if ((!lookup_attribute ("no_unique_address", DECL_ATTRIBUTES (memb1
)))
1834 != !lookup_attribute ("no_unique_address", DECL_ATTRIBUTES (memb2
)))
1836 if (DECL_ALIGN (memb1
) != DECL_ALIGN (memb2
))
1838 if (!tree_int_cst_equal (bit_position (memb1
), bit_position (memb2
)))
1843 /* Return true if TYPE1 and TYPE2 are layout-compatible types. */
1846 layout_compatible_type_p (tree type1
, tree type2
)
1848 if (type1
== error_mark_node
|| type2
== error_mark_node
)
1852 if (TREE_CODE (type1
) != TREE_CODE (type2
))
1855 type1
= cp_build_qualified_type (type1
, TYPE_UNQUALIFIED
);
1856 type2
= cp_build_qualified_type (type2
, TYPE_UNQUALIFIED
);
1858 if (TREE_CODE (type1
) == ENUMERAL_TYPE
)
1859 return (tree_int_cst_equal (TYPE_SIZE (type1
), TYPE_SIZE (type2
))
1860 && same_type_p (finish_underlying_type (type1
),
1861 finish_underlying_type (type2
)));
1863 if (CLASS_TYPE_P (type1
)
1864 && std_layout_type_p (type1
)
1865 && std_layout_type_p (type2
)
1866 && tree_int_cst_equal (TYPE_SIZE (type1
), TYPE_SIZE (type2
)))
1868 tree field1
= TYPE_FIELDS (type1
);
1869 tree field2
= TYPE_FIELDS (type2
);
1870 if (TREE_CODE (type1
) == RECORD_TYPE
)
1874 if (!next_common_initial_sequence (field1
, field2
))
1876 if (field1
== NULL_TREE
)
1878 field1
= DECL_CHAIN (field1
);
1879 field2
= DECL_CHAIN (field2
);
1882 /* Otherwise both types must be union types.
1884 "Two standard-layout unions are layout-compatible if they have
1885 the same number of non-static data members and corresponding
1886 non-static data members (in any order) have layout-compatible
1888 but the code anticipates that bitfield vs. non-bitfield,
1889 different bitfield widths or presence/absence of
1890 [[no_unique_address]] should be checked as well. */
1891 auto_vec
<tree
, 16> vec
;
1892 unsigned int count
= 0;
1893 for (; field1
; field1
= DECL_CHAIN (field1
))
1894 if (TREE_CODE (field1
) == FIELD_DECL
)
1896 for (; field2
; field2
= DECL_CHAIN (field2
))
1897 if (TREE_CODE (field2
) == FIELD_DECL
)
1898 vec
.safe_push (field2
);
1899 /* Discussions on core lean towards treating multiple union fields
1900 of the same type as the same field, so this might need changing
1902 if (count
!= vec
.length ())
1904 for (field1
= TYPE_FIELDS (type1
); field1
; field1
= DECL_CHAIN (field1
))
1906 if (TREE_CODE (field1
) != FIELD_DECL
)
1909 tree t1
= DECL_BIT_FIELD_TYPE (field1
);
1910 if (t1
== NULL_TREE
)
1911 t1
= TREE_TYPE (field1
);
1912 FOR_EACH_VEC_ELT (vec
, j
, field2
)
1914 tree t2
= DECL_BIT_FIELD_TYPE (field2
);
1915 if (t2
== NULL_TREE
)
1916 t2
= TREE_TYPE (field2
);
1917 if (DECL_BIT_FIELD_TYPE (field1
))
1919 if (!DECL_BIT_FIELD_TYPE (field2
))
1921 if (TYPE_PRECISION (TREE_TYPE (field1
))
1922 != TYPE_PRECISION (TREE_TYPE (field2
)))
1925 else if (DECL_BIT_FIELD_TYPE (field2
))
1927 if (!layout_compatible_type_p (t1
, t2
))
1929 if ((!lookup_attribute ("no_unique_address",
1930 DECL_ATTRIBUTES (field1
)))
1931 != !lookup_attribute ("no_unique_address",
1932 DECL_ATTRIBUTES (field2
)))
1936 if (j
== vec
.length ())
1938 vec
.unordered_remove (j
);
1943 return same_type_p (type1
, type2
);
1946 /* Returns 1 if TYPE1 is at least as qualified as TYPE2. */
1949 at_least_as_qualified_p (const_tree type1
, const_tree type2
)
1951 int q1
= cp_type_quals (type1
);
1952 int q2
= cp_type_quals (type2
);
1954 /* All qualifiers for TYPE2 must also appear in TYPE1. */
1955 return (q1
& q2
) == q2
;
1958 /* Returns 1 if TYPE1 is more cv-qualified than TYPE2, -1 if TYPE2 is
1959 more cv-qualified that TYPE1, and 0 otherwise. */
1962 comp_cv_qualification (int q1
, int q2
)
1967 if ((q1
& q2
) == q2
)
1969 else if ((q1
& q2
) == q1
)
1976 comp_cv_qualification (const_tree type1
, const_tree type2
)
1978 int q1
= cp_type_quals (type1
);
1979 int q2
= cp_type_quals (type2
);
1980 return comp_cv_qualification (q1
, q2
);
1983 /* Returns 1 if the cv-qualification signature of TYPE1 is a proper
1984 subset of the cv-qualification signature of TYPE2, and the types
1985 are similar. Returns -1 if the other way 'round, and 0 otherwise. */
1988 comp_cv_qual_signature (tree type1
, tree type2
)
1990 if (comp_ptr_ttypes_real (type2
, type1
, -1))
1992 else if (comp_ptr_ttypes_real (type1
, type2
, -1))
1998 /* Subroutines of `comptypes'. */
2000 /* Return true if two parameter type lists PARMS1 and PARMS2 are
2001 equivalent in the sense that functions with those parameter types
2002 can have equivalent types. The two lists must be equivalent,
2003 element by element. */
2006 compparms (const_tree parms1
, const_tree parms2
)
2010 /* An unspecified parmlist matches any specified parmlist
2011 whose argument types don't need default promotions. */
2013 for (t1
= parms1
, t2
= parms2
;
2015 t1
= TREE_CHAIN (t1
), t2
= TREE_CHAIN (t2
))
2017 /* If one parmlist is shorter than the other,
2018 they fail to match. */
2021 if (!same_type_p (TREE_VALUE (t1
), TREE_VALUE (t2
)))
2028 /* Process a sizeof or alignof expression where the operand is a type.
2029 STD_ALIGNOF indicates whether an alignof has C++11 (minimum alignment)
2030 or GNU (preferred alignment) semantics; it is ignored if OP is
2034 cxx_sizeof_or_alignof_type (location_t loc
, tree type
, enum tree_code op
,
2035 bool std_alignof
, bool complain
)
2037 gcc_assert (op
== SIZEOF_EXPR
|| op
== ALIGNOF_EXPR
);
2038 if (type
== error_mark_node
)
2039 return error_mark_node
;
2041 type
= non_reference (type
);
2042 if (TREE_CODE (type
) == METHOD_TYPE
)
2046 pedwarn (loc
, OPT_Wpointer_arith
,
2047 "invalid application of %qs to a member function",
2048 OVL_OP_INFO (false, op
)->name
);
2049 return size_one_node
;
2052 return error_mark_node
;
2054 else if (VOID_TYPE_P (type
) && std_alignof
)
2057 error_at (loc
, "invalid application of %qs to a void type",
2058 OVL_OP_INFO (false, op
)->name
);
2059 return error_mark_node
;
2062 bool dependent_p
= dependent_type_p (type
);
2064 complete_type (type
);
2066 /* VLA types will have a non-constant size. In the body of an
2067 uninstantiated template, we don't need to try to compute the
2068 value, because the sizeof expression is not an integral
2069 constant expression in that case. And, if we do try to
2070 compute the value, we'll likely end up with SAVE_EXPRs, which
2071 the template substitution machinery does not expect to see. */
2072 || (processing_template_decl
2073 && COMPLETE_TYPE_P (type
)
2074 && TREE_CODE (TYPE_SIZE (type
)) != INTEGER_CST
))
2076 tree value
= build_min (op
, size_type_node
, type
);
2077 TREE_READONLY (value
) = 1;
2078 if (op
== ALIGNOF_EXPR
&& std_alignof
)
2079 ALIGNOF_EXPR_STD_P (value
) = true;
2080 SET_EXPR_LOCATION (value
, loc
);
2084 return c_sizeof_or_alignof_type (loc
, complete_type (type
),
2085 op
== SIZEOF_EXPR
, std_alignof
,
2089 /* Return the size of the type, without producing any warnings for
2090 types whose size cannot be taken. This routine should be used only
2091 in some other routine that has already produced a diagnostic about
2092 using the size of such a type. */
2094 cxx_sizeof_nowarn (tree type
)
2096 if (TREE_CODE (type
) == FUNCTION_TYPE
2097 || VOID_TYPE_P (type
)
2098 || TREE_CODE (type
) == ERROR_MARK
)
2099 return size_one_node
;
2100 else if (!COMPLETE_TYPE_P (type
))
2101 return size_zero_node
;
2103 return cxx_sizeof_or_alignof_type (input_location
, type
,
2104 SIZEOF_EXPR
, false, false);
2107 /* Process a sizeof expression where the operand is an expression. */
2110 cxx_sizeof_expr (location_t loc
, tree e
, tsubst_flags_t complain
)
2112 if (e
== error_mark_node
)
2113 return error_mark_node
;
2115 if (instantiation_dependent_uneval_expression_p (e
))
2117 e
= build_min (SIZEOF_EXPR
, size_type_node
, e
);
2118 TREE_SIDE_EFFECTS (e
) = 0;
2119 TREE_READONLY (e
) = 1;
2120 SET_EXPR_LOCATION (e
, loc
);
2125 location_t e_loc
= cp_expr_loc_or_loc (e
, loc
);
2126 STRIP_ANY_LOCATION_WRAPPER (e
);
2128 /* To get the size of a static data member declared as an array of
2129 unknown bound, we need to instantiate it. */
2131 && VAR_HAD_UNKNOWN_BOUND (e
)
2132 && DECL_TEMPLATE_INSTANTIATION (e
))
2133 instantiate_decl (e
, /*defer_ok*/true, /*expl_inst_mem*/false);
2135 if (TREE_CODE (e
) == PARM_DECL
2136 && DECL_ARRAY_PARAMETER_P (e
)
2137 && (complain
& tf_warning
))
2139 auto_diagnostic_group d
;
2140 if (warning_at (e_loc
, OPT_Wsizeof_array_argument
,
2141 "%<sizeof%> on array function parameter %qE "
2142 "will return size of %qT", e
, TREE_TYPE (e
)))
2143 inform (DECL_SOURCE_LOCATION (e
), "declared here");
2146 e
= mark_type_use (e
);
2150 if (complain
& tf_error
)
2152 "invalid application of %<sizeof%> to a bit-field");
2154 return error_mark_node
;
2157 else if (is_overloaded_fn (e
))
2159 if (complain
& tf_error
)
2160 permerror (e_loc
, "ISO C++ forbids applying %<sizeof%> to "
2161 "an expression of function type");
2163 return error_mark_node
;
2166 else if (type_unknown_p (e
))
2168 if (complain
& tf_error
)
2169 cxx_incomplete_type_error (e_loc
, e
, TREE_TYPE (e
));
2171 return error_mark_node
;
2177 return cxx_sizeof_or_alignof_type (loc
, e
, SIZEOF_EXPR
, false,
2178 complain
& tf_error
);
2181 /* Implement the __alignof keyword: Return the minimum required
2182 alignment of E, measured in bytes. For VAR_DECL's and
2183 FIELD_DECL's return DECL_ALIGN (which can be set from an
2184 "aligned" __attribute__ specification). STD_ALIGNOF acts
2185 like in cxx_sizeof_or_alignof_type. */
2188 cxx_alignof_expr (location_t loc
, tree e
, bool std_alignof
,
2189 tsubst_flags_t complain
)
2193 if (e
== error_mark_node
)
2194 return error_mark_node
;
2196 if (processing_template_decl
)
2198 e
= build_min (ALIGNOF_EXPR
, size_type_node
, e
);
2199 TREE_SIDE_EFFECTS (e
) = 0;
2200 TREE_READONLY (e
) = 1;
2201 SET_EXPR_LOCATION (e
, loc
);
2202 ALIGNOF_EXPR_STD_P (e
) = std_alignof
;
2207 location_t e_loc
= cp_expr_loc_or_loc (e
, loc
);
2208 STRIP_ANY_LOCATION_WRAPPER (e
);
2210 e
= mark_type_use (e
);
2212 if (!verify_type_context (loc
, TCTX_ALIGNOF
, TREE_TYPE (e
),
2213 !(complain
& tf_error
)))
2215 if (!(complain
& tf_error
))
2216 return error_mark_node
;
2220 t
= size_int (DECL_ALIGN_UNIT (e
));
2221 else if (bitfield_p (e
))
2223 if (complain
& tf_error
)
2225 "invalid application of %<__alignof%> to a bit-field");
2227 return error_mark_node
;
2230 else if (TREE_CODE (e
) == COMPONENT_REF
2231 && TREE_CODE (TREE_OPERAND (e
, 1)) == FIELD_DECL
)
2232 t
= size_int (DECL_ALIGN_UNIT (TREE_OPERAND (e
, 1)));
2233 else if (is_overloaded_fn (e
))
2235 if (complain
& tf_error
)
2236 permerror (e_loc
, "ISO C++ forbids applying %<__alignof%> to "
2237 "an expression of function type");
2239 return error_mark_node
;
2240 if (TREE_CODE (e
) == FUNCTION_DECL
)
2241 t
= size_int (DECL_ALIGN_UNIT (e
));
2245 else if (type_unknown_p (e
))
2247 if (complain
& tf_error
)
2248 cxx_incomplete_type_error (e_loc
, e
, TREE_TYPE (e
));
2250 return error_mark_node
;
2254 return cxx_sizeof_or_alignof_type (loc
, TREE_TYPE (e
),
2255 ALIGNOF_EXPR
, std_alignof
,
2256 complain
& tf_error
);
2258 return fold_convert_loc (loc
, size_type_node
, t
);
2261 /* Process a sizeof or alignof expression E with code OP where the operand
2262 is an expression. STD_ALIGNOF acts like in cxx_sizeof_or_alignof_type. */
2265 cxx_sizeof_or_alignof_expr (location_t loc
, tree e
, enum tree_code op
,
2266 bool std_alignof
, bool complain
)
2268 gcc_assert (op
== SIZEOF_EXPR
|| op
== ALIGNOF_EXPR
);
2269 if (op
== SIZEOF_EXPR
)
2270 return cxx_sizeof_expr (loc
, e
, complain
? tf_warning_or_error
: tf_none
);
2272 return cxx_alignof_expr (loc
, e
, std_alignof
,
2273 complain
? tf_warning_or_error
: tf_none
);
2276 /* Build a representation of an expression 'alignas(E).' Return the
2277 folded integer value of E if it is an integral constant expression
2278 that resolves to a valid alignment. If E depends on a template
2279 parameter, return a syntactic representation tree of kind
2280 ALIGNOF_EXPR. Otherwise, return an error_mark_node if the
2281 expression is ill formed, or NULL_TREE if E is NULL_TREE. */
2284 cxx_alignas_expr (tree e
)
2286 if (e
== NULL_TREE
|| e
== error_mark_node
2287 || (!TYPE_P (e
) && !require_potential_rvalue_constant_expression (e
)))
2293 When the alignment-specifier is of the form
2294 alignas(type-id), it shall have the same effect as
2295 alignas(alignof(type-id)). */
2297 return cxx_sizeof_or_alignof_type (input_location
,
2299 /*std_alignof=*/true,
2302 /* If we reach this point, it means the alignas expression if of
2303 the form "alignas(assignment-expression)", so we should follow
2304 what is stated by [dcl.align]/2. */
2306 if (value_dependent_expression_p (e
))
2307 /* Leave value-dependent expression alone for now. */
2310 e
= instantiate_non_dependent_expr (e
);
2311 e
= mark_rvalue_use (e
);
2313 /* [dcl.align]/2 says:
2315 the assignment-expression shall be an integral constant
2318 if (!INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (TREE_TYPE (e
)))
2320 error ("%<alignas%> argument has non-integral type %qT", TREE_TYPE (e
));
2321 return error_mark_node
;
2324 return cxx_constant_value (e
);
2328 /* EXPR is being used in a context that is not a function call.
2333 The expression can be used only as the left-hand operand of a
2334 member function call.
2336 [expr.mptr.operator]
2338 If the result of .* or ->* is a function, then that result can be
2339 used only as the operand for the function call operator ().
2341 by issuing an error message if appropriate. Returns true iff EXPR
2342 violates these rules. */
2345 invalid_nonstatic_memfn_p (location_t loc
, tree expr
, tsubst_flags_t complain
)
2347 if (expr
== NULL_TREE
)
2349 /* Don't enforce this in MS mode. */
2350 if (flag_ms_extensions
)
2352 if (is_overloaded_fn (expr
) && !really_overloaded_fn (expr
))
2353 expr
= get_first_fn (expr
);
2354 if (TREE_TYPE (expr
)
2355 && DECL_NONSTATIC_MEMBER_FUNCTION_P (expr
))
2357 if (complain
& tf_error
)
2361 error_at (loc
, "invalid use of non-static member function %qD",
2363 inform (DECL_SOURCE_LOCATION (expr
), "declared here");
2366 error_at (loc
, "invalid use of non-static member function of "
2367 "type %qT", TREE_TYPE (expr
));
2374 /* If EXP is a reference to a bit-field, and the type of EXP does not
2375 match the declared type of the bit-field, return the declared type
2376 of the bit-field. Otherwise, return NULL_TREE. */
2379 is_bitfield_expr_with_lowered_type (const_tree exp
)
2381 switch (TREE_CODE (exp
))
2384 if (!is_bitfield_expr_with_lowered_type (TREE_OPERAND (exp
, 1)
2385 ? TREE_OPERAND (exp
, 1)
2386 : TREE_OPERAND (exp
, 0)))
2388 return is_bitfield_expr_with_lowered_type (TREE_OPERAND (exp
, 2));
2391 return is_bitfield_expr_with_lowered_type (TREE_OPERAND (exp
, 1));
2395 case UNARY_PLUS_EXPR
:
2396 case PREDECREMENT_EXPR
:
2397 case PREINCREMENT_EXPR
:
2398 case POSTDECREMENT_EXPR
:
2399 case POSTINCREMENT_EXPR
:
2401 case NON_LVALUE_EXPR
:
2403 return is_bitfield_expr_with_lowered_type (TREE_OPERAND (exp
, 0));
2409 field
= TREE_OPERAND (exp
, 1);
2410 if (TREE_CODE (field
) != FIELD_DECL
|| !DECL_BIT_FIELD_TYPE (field
))
2412 if (same_type_ignoring_top_level_qualifiers_p
2413 (TREE_TYPE (exp
), DECL_BIT_FIELD_TYPE (field
)))
2415 return DECL_BIT_FIELD_TYPE (field
);
2419 if (DECL_HAS_VALUE_EXPR_P (exp
))
2420 return is_bitfield_expr_with_lowered_type (DECL_VALUE_EXPR
2421 (CONST_CAST_TREE (exp
)));
2424 case VIEW_CONVERT_EXPR
:
2425 if (location_wrapper_p (exp
))
2426 return is_bitfield_expr_with_lowered_type (TREE_OPERAND (exp
, 0));
2435 /* Like is_bitfield_with_lowered_type, except that if EXP is not a
2436 bitfield with a lowered type, the type of EXP is returned, rather
2440 unlowered_expr_type (const_tree exp
)
2443 tree etype
= TREE_TYPE (exp
);
2445 type
= is_bitfield_expr_with_lowered_type (exp
);
2447 type
= cp_build_qualified_type (type
, cp_type_quals (etype
));
2454 /* Perform the conversions in [expr] that apply when an lvalue appears
2455 in an rvalue context: the lvalue-to-rvalue, array-to-pointer, and
2456 function-to-pointer conversions. In addition, bitfield references are
2457 converted to their declared types. Note that this function does not perform
2458 the lvalue-to-rvalue conversion for class types. If you need that conversion
2459 for class types, then you probably need to use force_rvalue.
2461 Although the returned value is being used as an rvalue, this
2462 function does not wrap the returned expression in a
2463 NON_LVALUE_EXPR; the caller is expected to be mindful of the fact
2464 that the return value is no longer an lvalue. */
2467 decay_conversion (tree exp
,
2468 tsubst_flags_t complain
,
2469 bool reject_builtin
/* = true */)
2472 enum tree_code code
;
2473 location_t loc
= cp_expr_loc_or_input_loc (exp
);
2475 type
= TREE_TYPE (exp
);
2476 if (type
== error_mark_node
)
2477 return error_mark_node
;
2479 exp
= resolve_nondeduced_context_or_error (exp
, complain
);
2481 code
= TREE_CODE (type
);
2483 if (error_operand_p (exp
))
2484 return error_mark_node
;
2486 if (NULLPTR_TYPE_P (type
) && !TREE_SIDE_EFFECTS (exp
))
2488 mark_rvalue_use (exp
, loc
, reject_builtin
);
2489 return nullptr_node
;
2492 /* build_c_cast puts on a NOP_EXPR to make the result not an lvalue.
2493 Leave such NOP_EXPRs, since RHS is being used in non-lvalue context. */
2494 if (code
== VOID_TYPE
)
2496 if (complain
& tf_error
)
2497 error_at (loc
, "void value not ignored as it ought to be");
2498 return error_mark_node
;
2500 if (invalid_nonstatic_memfn_p (loc
, exp
, complain
))
2501 return error_mark_node
;
2502 if (code
== FUNCTION_TYPE
|| is_overloaded_fn (exp
))
2504 exp
= mark_lvalue_use (exp
);
2505 if (reject_builtin
&& reject_gcc_builtin (exp
, loc
))
2506 return error_mark_node
;
2507 return cp_build_addr_expr (exp
, complain
);
2509 if (code
== ARRAY_TYPE
)
2514 exp
= mark_lvalue_use (exp
);
2516 if (INDIRECT_REF_P (exp
))
2517 return build_nop (build_pointer_type (TREE_TYPE (type
)),
2518 TREE_OPERAND (exp
, 0));
2520 if (TREE_CODE (exp
) == COMPOUND_EXPR
)
2522 tree op1
= decay_conversion (TREE_OPERAND (exp
, 1), complain
);
2523 if (op1
== error_mark_node
)
2524 return error_mark_node
;
2525 return build2 (COMPOUND_EXPR
, TREE_TYPE (op1
),
2526 TREE_OPERAND (exp
, 0), op1
);
2529 if (!obvalue_p (exp
)
2530 && ! (TREE_CODE (exp
) == CONSTRUCTOR
&& TREE_STATIC (exp
)))
2532 if (complain
& tf_error
)
2533 error_at (loc
, "invalid use of non-lvalue array");
2534 return error_mark_node
;
2537 /* Don't let an array compound literal decay to a pointer. It can
2538 still be used to initialize an array or bind to a reference. */
2539 if (TREE_CODE (exp
) == TARGET_EXPR
)
2541 if (complain
& tf_error
)
2542 error_at (loc
, "taking address of temporary array");
2543 return error_mark_node
;
2546 ptrtype
= build_pointer_type (TREE_TYPE (type
));
2550 if (!cxx_mark_addressable (exp
))
2551 return error_mark_node
;
2552 adr
= build_nop (ptrtype
, build_address (exp
));
2555 /* This way is better for a COMPONENT_REF since it can
2556 simplify the offset for a component. */
2557 adr
= cp_build_addr_expr (exp
, complain
);
2558 return cp_convert (ptrtype
, adr
, complain
);
2561 /* Otherwise, it's the lvalue-to-rvalue conversion. */
2562 exp
= mark_rvalue_use (exp
, loc
, reject_builtin
);
2564 /* If a bitfield is used in a context where integral promotion
2565 applies, then the caller is expected to have used
2566 default_conversion. That function promotes bitfields correctly
2567 before calling this function. At this point, if we have a
2568 bitfield referenced, we may assume that is not subject to
2569 promotion, and that, therefore, the type of the resulting rvalue
2570 is the declared type of the bitfield. */
2571 exp
= convert_bitfield_to_declared_type (exp
);
2573 /* We do not call rvalue() here because we do not want to wrap EXP
2574 in a NON_LVALUE_EXPR. */
2578 Non-class rvalues always have cv-unqualified types. */
2579 type
= TREE_TYPE (exp
);
2580 if (!CLASS_TYPE_P (type
) && cv_qualified_p (type
))
2581 exp
= build_nop (cv_unqualified (type
), exp
);
2583 if (!complete_type_or_maybe_complain (type
, exp
, complain
))
2584 return error_mark_node
;
2589 /* Perform preparatory conversions, as part of the "usual arithmetic
2590 conversions". In particular, as per [expr]:
2592 Whenever an lvalue expression appears as an operand of an
2593 operator that expects the rvalue for that operand, the
2594 lvalue-to-rvalue, array-to-pointer, or function-to-pointer
2595 standard conversions are applied to convert the expression to an
2598 In addition, we perform integral promotions here, as those are
2599 applied to both operands to a binary operator before determining
2600 what additional conversions should apply. */
2603 cp_default_conversion (tree exp
, tsubst_flags_t complain
)
2605 /* Check for target-specific promotions. */
2606 tree promoted_type
= targetm
.promoted_type (TREE_TYPE (exp
));
2608 exp
= cp_convert (promoted_type
, exp
, complain
);
2609 /* Perform the integral promotions first so that bitfield
2610 expressions (which may promote to "int", even if the bitfield is
2611 declared "unsigned") are promoted correctly. */
2612 else if (INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (TREE_TYPE (exp
)))
2613 exp
= cp_perform_integral_promotions (exp
, complain
);
2614 /* Perform the other conversions. */
2615 exp
= decay_conversion (exp
, complain
);
2623 default_conversion (tree exp
)
2625 return cp_default_conversion (exp
, tf_warning_or_error
);
2628 /* EXPR is an expression with an integral or enumeration type.
2629 Perform the integral promotions in [conv.prom], and return the
2633 cp_perform_integral_promotions (tree expr
, tsubst_flags_t complain
)
2638 expr
= mark_rvalue_use (expr
);
2639 if (error_operand_p (expr
))
2640 return error_mark_node
;
2642 type
= TREE_TYPE (expr
);
2646 A prvalue for an integral bit-field (11.3.9) can be converted to a prvalue
2647 of type int if int can represent all the values of the bit-field;
2648 otherwise, it can be converted to unsigned int if unsigned int can
2649 represent all the values of the bit-field. If the bit-field is larger yet,
2650 no integral promotion applies to it. If the bit-field has an enumerated
2651 type, it is treated as any other value of that type for promotion
2653 tree bitfield_type
= is_bitfield_expr_with_lowered_type (expr
);
2655 && (TREE_CODE (bitfield_type
) == ENUMERAL_TYPE
2656 || TYPE_PRECISION (type
) > TYPE_PRECISION (integer_type_node
)))
2657 type
= bitfield_type
;
2659 gcc_assert (INTEGRAL_OR_ENUMERATION_TYPE_P (type
));
2660 /* Scoped enums don't promote. */
2661 if (SCOPED_ENUM_P (type
))
2663 promoted_type
= type_promotes_to (type
);
2664 if (type
!= promoted_type
)
2665 expr
= cp_convert (promoted_type
, expr
, complain
);
2666 else if (bitfield_type
&& bitfield_type
!= type
)
2667 /* Prevent decay_conversion from converting to bitfield_type. */
2668 expr
= build_nop (type
, expr
);
2675 perform_integral_promotions (tree expr
)
2677 return cp_perform_integral_promotions (expr
, tf_warning_or_error
);
2680 /* Returns nonzero iff exp is a STRING_CST or the result of applying
2681 decay_conversion to one. */
2684 string_conv_p (const_tree totype
, const_tree exp
, int warn
)
2688 if (!TYPE_PTR_P (totype
))
2691 t
= TREE_TYPE (totype
);
2692 if (!same_type_p (t
, char_type_node
)
2693 && !same_type_p (t
, char8_type_node
)
2694 && !same_type_p (t
, char16_type_node
)
2695 && !same_type_p (t
, char32_type_node
)
2696 && !same_type_p (t
, wchar_type_node
))
2699 location_t loc
= EXPR_LOC_OR_LOC (exp
, input_location
);
2701 STRIP_ANY_LOCATION_WRAPPER (exp
);
2703 if (TREE_CODE (exp
) == STRING_CST
)
2705 /* Make sure that we don't try to convert between char and wide chars. */
2706 if (!same_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (exp
))), t
))
2711 /* Is this a string constant which has decayed to 'const char *'? */
2712 t
= build_pointer_type (cp_build_qualified_type (t
, TYPE_QUAL_CONST
));
2713 if (!same_type_p (TREE_TYPE (exp
), t
))
2716 if (TREE_CODE (exp
) != ADDR_EXPR
2717 || TREE_CODE (TREE_OPERAND (exp
, 0)) != STRING_CST
)
2722 if (cxx_dialect
>= cxx11
)
2723 pedwarn (loc
, OPT_Wwrite_strings
,
2724 "ISO C++ forbids converting a string constant to %qT",
2727 warning_at (loc
, OPT_Wwrite_strings
,
2728 "deprecated conversion from string constant to %qT",
2735 /* Given a COND_EXPR, MIN_EXPR, or MAX_EXPR in T, return it in a form that we
2736 can, for example, use as an lvalue. This code used to be in
2737 unary_complex_lvalue, but we needed it to deal with `a = (d == c) ? b : c'
2738 expressions, where we're dealing with aggregates. But now it's again only
2739 called from unary_complex_lvalue. The case (in particular) that led to
2740 this was with CODE == ADDR_EXPR, since it's not an lvalue when we'd
2744 rationalize_conditional_expr (enum tree_code code
, tree t
,
2745 tsubst_flags_t complain
)
2747 location_t loc
= cp_expr_loc_or_input_loc (t
);
2749 /* For MIN_EXPR or MAX_EXPR, fold-const.cc has arranged things so that
2750 the first operand is always the one to be used if both operands
2751 are equal, so we know what conditional expression this used to be. */
2752 if (TREE_CODE (t
) == MIN_EXPR
|| TREE_CODE (t
) == MAX_EXPR
)
2754 tree op0
= TREE_OPERAND (t
, 0);
2755 tree op1
= TREE_OPERAND (t
, 1);
2757 /* The following code is incorrect if either operand side-effects. */
2758 gcc_assert (!TREE_SIDE_EFFECTS (op0
)
2759 && !TREE_SIDE_EFFECTS (op1
));
2761 build_conditional_expr (loc
,
2762 build_x_binary_op (loc
,
2763 (TREE_CODE (t
) == MIN_EXPR
2764 ? LE_EXPR
: GE_EXPR
),
2765 op0
, TREE_CODE (op0
),
2766 op1
, TREE_CODE (op1
),
2770 cp_build_unary_op (code
, op0
, false, complain
),
2771 cp_build_unary_op (code
, op1
, false, complain
),
2775 tree op1
= TREE_OPERAND (t
, 1);
2776 if (TREE_CODE (op1
) != THROW_EXPR
)
2777 op1
= cp_build_unary_op (code
, op1
, false, complain
);
2778 tree op2
= TREE_OPERAND (t
, 2);
2779 if (TREE_CODE (op2
) != THROW_EXPR
)
2780 op2
= cp_build_unary_op (code
, op2
, false, complain
);
2783 build_conditional_expr (loc
, TREE_OPERAND (t
, 0), op1
, op2
, complain
);
2786 /* Given the TYPE of an anonymous union field inside T, return the
2787 FIELD_DECL for the field. If not found return NULL_TREE. Because
2788 anonymous unions can nest, we must also search all anonymous unions
2789 that are directly reachable. */
2792 lookup_anon_field (tree
, tree type
)
2796 type
= TYPE_MAIN_VARIANT (type
);
2797 field
= ANON_AGGR_TYPE_FIELD (type
);
2802 /* Build an expression representing OBJECT.MEMBER. OBJECT is an
2803 expression; MEMBER is a DECL or baselink. If ACCESS_PATH is
2804 non-NULL, it indicates the path to the base used to name MEMBER.
2805 If PRESERVE_REFERENCE is true, the expression returned will have
2806 REFERENCE_TYPE if the MEMBER does. Otherwise, the expression
2807 returned will have the type referred to by the reference.
2809 This function does not perform access control; that is either done
2810 earlier by the parser when the name of MEMBER is resolved to MEMBER
2811 itself, or later when overload resolution selects one of the
2812 functions indicated by MEMBER. */
2815 build_class_member_access_expr (cp_expr object
, tree member
,
2816 tree access_path
, bool preserve_reference
,
2817 tsubst_flags_t complain
)
2821 tree result
= NULL_TREE
;
2822 tree using_decl
= NULL_TREE
;
2824 if (error_operand_p (object
) || error_operand_p (member
))
2825 return error_mark_node
;
2827 gcc_assert (DECL_P (member
) || BASELINK_P (member
));
2831 The type of the first expression shall be "class object" (of a
2833 object_type
= TREE_TYPE (object
);
2834 if (!currently_open_class (object_type
)
2835 && !complete_type_or_maybe_complain (object_type
, object
, complain
))
2836 return error_mark_node
;
2837 if (!CLASS_TYPE_P (object_type
))
2839 if (complain
& tf_error
)
2841 if (INDIRECT_TYPE_P (object_type
)
2842 && CLASS_TYPE_P (TREE_TYPE (object_type
)))
2843 error ("request for member %qD in %qE, which is of pointer "
2844 "type %qT (maybe you meant to use %<->%> ?)",
2845 member
, object
.get_value (), object_type
);
2847 error ("request for member %qD in %qE, which is of non-class "
2848 "type %qT", member
, object
.get_value (), object_type
);
2850 return error_mark_node
;
2853 /* The standard does not seem to actually say that MEMBER must be a
2854 member of OBJECT_TYPE. However, that is clearly what is
2856 if (DECL_P (member
))
2858 member_scope
= DECL_CLASS_CONTEXT (member
);
2859 if (!mark_used (member
, complain
) && !(complain
& tf_error
))
2860 return error_mark_node
;
2862 if (TREE_UNAVAILABLE (member
))
2863 error_unavailable_use (member
, NULL_TREE
);
2864 else if (TREE_DEPRECATED (member
))
2865 warn_deprecated_use (member
, NULL_TREE
);
2868 member_scope
= BINFO_TYPE (BASELINK_ACCESS_BINFO (member
));
2869 /* If MEMBER is from an anonymous aggregate, MEMBER_SCOPE will
2870 presently be the anonymous union. Go outwards until we find a
2871 type related to OBJECT_TYPE. */
2872 while ((ANON_AGGR_TYPE_P (member_scope
) || UNSCOPED_ENUM_P (member_scope
))
2873 && !same_type_ignoring_top_level_qualifiers_p (member_scope
,
2875 member_scope
= TYPE_CONTEXT (member_scope
);
2876 if (!member_scope
|| !DERIVED_FROM_P (member_scope
, object_type
))
2878 if (complain
& tf_error
)
2880 if (TREE_CODE (member
) == FIELD_DECL
)
2881 error ("invalid use of non-static data member %qE", member
);
2883 error ("%qD is not a member of %qT", member
, object_type
);
2885 return error_mark_node
;
2888 /* Transform `(a, b).x' into `(*(a, &b)).x', `(a ? b : c).x' into
2889 `(*(a ? &b : &c)).x', and so on. A COND_EXPR is only an lvalue
2890 in the front end; only _DECLs and _REFs are lvalues in the back end. */
2891 if (tree temp
= unary_complex_lvalue (ADDR_EXPR
, object
))
2893 temp
= cp_build_fold_indirect_ref (temp
);
2894 if (!lvalue_p (object
) && lvalue_p (temp
))
2895 /* Preserve rvalueness. */
2900 /* In [expr.ref], there is an explicit list of the valid choices for
2901 MEMBER. We check for each of those cases here. */
2904 /* A static data member. */
2906 mark_exp_read (object
);
2908 if (tree wrap
= maybe_get_tls_wrapper_call (result
))
2909 /* Replace an evaluated use of the thread_local variable with
2910 a call to its wrapper. */
2913 /* If OBJECT has side-effects, they are supposed to occur. */
2914 if (TREE_SIDE_EFFECTS (object
))
2915 result
= build2 (COMPOUND_EXPR
, TREE_TYPE (result
), object
, result
);
2917 else if (TREE_CODE (member
) == FIELD_DECL
)
2919 /* A non-static data member. */
2924 if (INDIRECT_REF_P (object
))
2926 integer_zerop (tree_strip_nop_conversions (TREE_OPERAND (object
, 0)));
2928 null_object_p
= false;
2930 /* Convert OBJECT to the type of MEMBER. */
2931 if (!same_type_p (TYPE_MAIN_VARIANT (object_type
),
2932 TYPE_MAIN_VARIANT (member_scope
)))
2937 /* We didn't complain above about a currently open class, but now we
2938 must: we don't know how to refer to a base member before layout is
2939 complete. But still don't complain in a template. */
2940 if (!cp_unevaluated_operand
2941 && !dependent_type_p (object_type
)
2942 && !complete_type_or_maybe_complain (object_type
, object
,
2944 return error_mark_node
;
2946 binfo
= lookup_base (access_path
? access_path
: object_type
,
2947 member_scope
, ba_unique
, &kind
, complain
);
2948 if (binfo
== error_mark_node
)
2949 return error_mark_node
;
2951 /* It is invalid to try to get to a virtual base of a
2952 NULL object. The most common cause is invalid use of
2954 if (null_object_p
&& kind
== bk_via_virtual
)
2956 if (complain
& tf_error
)
2958 error ("invalid access to non-static data member %qD in "
2959 "virtual base of NULL object", member
);
2961 return error_mark_node
;
2964 /* Convert to the base. */
2965 object
= build_base_path (PLUS_EXPR
, object
, binfo
,
2966 /*nonnull=*/1, complain
);
2967 /* If we found the base successfully then we should be able
2968 to convert to it successfully. */
2969 gcc_assert (object
!= error_mark_node
);
2972 /* If MEMBER is from an anonymous aggregate, we have converted
2973 OBJECT so that it refers to the class containing the
2974 anonymous union. Generate a reference to the anonymous union
2975 itself, and recur to find MEMBER. */
2976 if (ANON_AGGR_TYPE_P (DECL_CONTEXT (member
))
2977 /* When this code is called from build_field_call, the
2978 object already has the type of the anonymous union.
2979 That is because the COMPONENT_REF was already
2980 constructed, and was then disassembled before calling
2981 build_field_call. After the function-call code is
2982 cleaned up, this waste can be eliminated. */
2983 && (!same_type_ignoring_top_level_qualifiers_p
2984 (TREE_TYPE (object
), DECL_CONTEXT (member
))))
2986 tree anonymous_union
;
2988 anonymous_union
= lookup_anon_field (TREE_TYPE (object
),
2989 DECL_CONTEXT (member
));
2990 object
= build_class_member_access_expr (object
,
2992 /*access_path=*/NULL_TREE
,
2997 /* Compute the type of the field, as described in [expr.ref]. */
2998 type_quals
= TYPE_UNQUALIFIED
;
2999 member_type
= TREE_TYPE (member
);
3000 if (!TYPE_REF_P (member_type
))
3002 type_quals
= (cp_type_quals (member_type
)
3003 | cp_type_quals (object_type
));
3005 /* A field is const (volatile) if the enclosing object, or the
3006 field itself, is const (volatile). But, a mutable field is
3007 not const, even within a const object. */
3008 if (DECL_MUTABLE_P (member
))
3009 type_quals
&= ~TYPE_QUAL_CONST
;
3010 member_type
= cp_build_qualified_type (member_type
, type_quals
);
3013 result
= build3_loc (input_location
, COMPONENT_REF
, member_type
,
3014 object
, member
, NULL_TREE
);
3016 /* Mark the expression const or volatile, as appropriate. Even
3017 though we've dealt with the type above, we still have to mark the
3018 expression itself. */
3019 if (type_quals
& TYPE_QUAL_CONST
)
3020 TREE_READONLY (result
) = 1;
3021 if (type_quals
& TYPE_QUAL_VOLATILE
)
3022 TREE_THIS_VOLATILE (result
) = 1;
3024 else if (BASELINK_P (member
))
3026 /* The member is a (possibly overloaded) member function. */
3030 /* If the MEMBER is exactly one static member function, then we
3031 know the type of the expression. Otherwise, we must wait
3032 until overload resolution has been performed. */
3033 functions
= BASELINK_FUNCTIONS (member
);
3034 if (TREE_CODE (functions
) == FUNCTION_DECL
3035 && DECL_STATIC_FUNCTION_P (functions
))
3036 type
= TREE_TYPE (functions
);
3038 type
= unknown_type_node
;
3039 /* Note that we do not convert OBJECT to the BASELINK_BINFO
3040 base. That will happen when the function is called. */
3041 result
= build3_loc (input_location
, COMPONENT_REF
, type
, object
, member
,
3044 else if (TREE_CODE (member
) == CONST_DECL
)
3046 /* The member is an enumerator. */
3048 /* If OBJECT has side-effects, they are supposed to occur. */
3049 if (TREE_SIDE_EFFECTS (object
))
3050 result
= build2 (COMPOUND_EXPR
, TREE_TYPE (result
),
3053 else if ((using_decl
= strip_using_decl (member
)) != member
)
3054 result
= build_class_member_access_expr (object
,
3056 access_path
, preserve_reference
,
3060 if (complain
& tf_error
)
3061 error ("invalid use of %qD", member
);
3062 return error_mark_node
;
3065 if (!preserve_reference
)
3068 If E2 is declared to have type "reference to T", then ... the
3069 type of E1.E2 is T. */
3070 result
= convert_from_reference (result
);
3075 /* Return the destructor denoted by OBJECT.SCOPE::DTOR_NAME, or, if
3076 SCOPE is NULL, by OBJECT.DTOR_NAME, where DTOR_NAME is ~type. */
3079 lookup_destructor (tree object
, tree scope
, tree dtor_name
,
3080 tsubst_flags_t complain
)
3082 tree object_type
= TREE_TYPE (object
);
3083 tree dtor_type
= TREE_OPERAND (dtor_name
, 0);
3086 /* We've already complained about this destructor. */
3087 if (dtor_type
== error_mark_node
)
3088 return error_mark_node
;
3090 if (scope
&& !check_dtor_name (scope
, dtor_type
))
3092 if (complain
& tf_error
)
3093 error ("qualified type %qT does not match destructor name ~%qT",
3095 return error_mark_node
;
3097 if (is_auto (dtor_type
))
3098 dtor_type
= object_type
;
3099 else if (identifier_p (dtor_type
))
3101 /* In a template, names we can't find a match for are still accepted
3102 destructor names, and we check them here. */
3103 if (check_dtor_name (object_type
, dtor_type
))
3104 dtor_type
= object_type
;
3107 if (complain
& tf_error
)
3108 error ("object type %qT does not match destructor name ~%qT",
3109 object_type
, dtor_type
);
3110 return error_mark_node
;
3114 else if (!DERIVED_FROM_P (dtor_type
, TYPE_MAIN_VARIANT (object_type
)))
3116 if (complain
& tf_error
)
3117 error ("the type being destroyed is %qT, but the destructor "
3118 "refers to %qT", TYPE_MAIN_VARIANT (object_type
), dtor_type
);
3119 return error_mark_node
;
3121 expr
= lookup_member (dtor_type
, complete_dtor_identifier
,
3122 /*protect=*/1, /*want_type=*/false,
3123 tf_warning_or_error
);
3126 if (complain
& tf_error
)
3127 cxx_incomplete_type_error (dtor_name
, dtor_type
);
3128 return error_mark_node
;
3130 expr
= (adjust_result_of_qualified_name_lookup
3131 (expr
, dtor_type
, object_type
));
3132 if (scope
== NULL_TREE
)
3133 /* We need to call adjust_result_of_qualified_name_lookup in case the
3134 destructor names a base class, but we unset BASELINK_QUALIFIED_P so
3135 that we still get virtual function binding. */
3136 BASELINK_QUALIFIED_P (expr
) = false;
3140 /* An expression of the form "A::template B" has been resolved to
3141 DECL. Issue a diagnostic if B is not a template or template
3145 check_template_keyword (tree decl
)
3147 /* The standard says:
3151 If a name prefixed by the keyword template is not a member
3152 template, the program is ill-formed.
3154 DR 228 removed the restriction that the template be a member
3157 DR 96, if accepted would add the further restriction that explicit
3158 template arguments must be provided if the template keyword is
3159 used, but, as of 2005-10-16, that DR is still in "drafting". If
3160 this DR is accepted, then the semantic checks here can be
3161 simplified, as the entity named must in fact be a template
3162 specialization, rather than, as at present, a set of overloaded
3163 functions containing at least one template function. */
3164 if (TREE_CODE (decl
) != TEMPLATE_DECL
3165 && TREE_CODE (decl
) != TEMPLATE_ID_EXPR
)
3169 if (DECL_USE_TEMPLATE (decl
)
3170 && PRIMARY_TEMPLATE_P (DECL_TI_TEMPLATE (decl
)))
3173 permerror (input_location
, "%qD is not a template", decl
);
3175 else if (!is_overloaded_fn (decl
))
3176 permerror (input_location
, "%qD is not a template", decl
);
3181 for (lkp_iterator
iter (MAYBE_BASELINK_FUNCTIONS (decl
));
3182 !found
&& iter
; ++iter
)
3185 if (TREE_CODE (fn
) == TEMPLATE_DECL
3186 || TREE_CODE (fn
) == TEMPLATE_ID_EXPR
3187 || (TREE_CODE (fn
) == FUNCTION_DECL
3188 && DECL_USE_TEMPLATE (fn
)
3189 && PRIMARY_TEMPLATE_P (DECL_TI_TEMPLATE (fn
))))
3193 permerror (input_location
, "%qD is not a template", decl
);
3198 /* Record that an access failure occurred on BASETYPE_PATH attempting
3199 to access DECL, where DIAG_DECL should be used for diagnostics. */
3202 access_failure_info::record_access_failure (tree basetype_path
,
3203 tree decl
, tree diag_decl
)
3205 m_was_inaccessible
= true;
3206 m_basetype_path
= basetype_path
;
3208 m_diag_decl
= diag_decl
;
3211 /* If an access failure was recorded, then attempt to locate an
3212 accessor function for the pertinent field.
3213 Otherwise, return NULL_TREE. */
3216 access_failure_info::get_any_accessor (bool const_p
) const
3218 if (!was_inaccessible_p ())
3222 = locate_field_accessor (m_basetype_path
, m_diag_decl
, const_p
);
3226 /* The accessor must itself be accessible for it to be a reasonable
3228 if (!accessible_p (m_basetype_path
, accessor
, true))
3234 /* Add a fix-it hint to RICHLOC suggesting the use of ACCESSOR_DECL, by
3235 replacing the primary location in RICHLOC with "accessor()". */
3238 access_failure_info::add_fixit_hint (rich_location
*richloc
,
3242 pp_string (&pp
, IDENTIFIER_POINTER (DECL_NAME (accessor_decl
)));
3243 pp_string (&pp
, "()");
3244 richloc
->add_fixit_replace (pp_formatted_text (&pp
));
3247 /* If an access failure was recorded, then attempt to locate an
3248 accessor function for the pertinent field, and if one is
3249 available, add a note and fix-it hint suggesting using it. */
3252 access_failure_info::maybe_suggest_accessor (bool const_p
) const
3254 tree accessor
= get_any_accessor (const_p
);
3255 if (accessor
== NULL_TREE
)
3257 rich_location
richloc (line_table
, input_location
);
3258 add_fixit_hint (&richloc
, accessor
);
3259 inform (&richloc
, "field %q#D can be accessed via %q#D",
3260 m_diag_decl
, accessor
);
3263 /* Subroutine of finish_class_member_access_expr.
3264 Issue an error about NAME not being a member of ACCESS_PATH (or
3265 OBJECT_TYPE), potentially providing a fix-it hint for misspelled
3269 complain_about_unrecognized_member (tree access_path
, tree name
,
3272 /* Attempt to provide a hint about misspelled names. */
3273 tree guessed_id
= lookup_member_fuzzy (access_path
, name
,
3274 /*want_type=*/false);
3275 if (guessed_id
== NULL_TREE
)
3278 error ("%q#T has no member named %qE",
3279 TREE_CODE (access_path
) == TREE_BINFO
3280 ? TREE_TYPE (access_path
) : object_type
, name
);
3284 location_t bogus_component_loc
= input_location
;
3285 gcc_rich_location
rich_loc (bogus_component_loc
);
3287 /* Check that the guessed name is accessible along access_path. */
3288 access_failure_info afi
;
3289 lookup_member (access_path
, guessed_id
, /*protect=*/1,
3290 /*want_type=*/false, /*complain=*/false,
3292 if (afi
.was_inaccessible_p ())
3294 tree accessor
= afi
.get_any_accessor (TYPE_READONLY (object_type
));
3297 /* The guessed name isn't directly accessible, but can be accessed
3298 via an accessor member function. */
3299 afi
.add_fixit_hint (&rich_loc
, accessor
);
3300 error_at (&rich_loc
,
3301 "%q#T has no member named %qE;"
3302 " did you mean %q#D? (accessible via %q#D)",
3303 TREE_CODE (access_path
) == TREE_BINFO
3304 ? TREE_TYPE (access_path
) : object_type
,
3305 name
, afi
.get_diag_decl (), accessor
);
3309 /* The guessed name isn't directly accessible, and no accessor
3310 member function could be found. */
3311 error_at (&rich_loc
,
3312 "%q#T has no member named %qE;"
3313 " did you mean %q#D? (not accessible from this context)",
3314 TREE_CODE (access_path
) == TREE_BINFO
3315 ? TREE_TYPE (access_path
) : object_type
,
3316 name
, afi
.get_diag_decl ());
3317 complain_about_access (afi
.get_decl (), afi
.get_diag_decl (),
3318 afi
.get_diag_decl (), false, ak_none
);
3323 /* The guessed name is directly accessible; suggest it. */
3324 rich_loc
.add_fixit_misspelled_id (bogus_component_loc
,
3326 error_at (&rich_loc
,
3327 "%q#T has no member named %qE;"
3328 " did you mean %qE?",
3329 TREE_CODE (access_path
) == TREE_BINFO
3330 ? TREE_TYPE (access_path
) : object_type
,
3335 /* This function is called by the parser to process a class member
3336 access expression of the form OBJECT.NAME. NAME is a node used by
3337 the parser to represent a name; it is not yet a DECL. It may,
3338 however, be a BASELINK where the BASELINK_FUNCTIONS is a
3339 TEMPLATE_ID_EXPR. Templates must be looked up by the parser, and
3340 there is no reason to do the lookup twice, so the parser keeps the
3341 BASELINK. TEMPLATE_P is true iff NAME was explicitly declared to
3342 be a template via the use of the "A::template B" syntax. */
3345 finish_class_member_access_expr (cp_expr object
, tree name
, bool template_p
,
3346 tsubst_flags_t complain
)
3351 tree access_path
= NULL_TREE
;
3352 tree orig_object
= object
;
3353 tree orig_name
= name
;
3355 if (object
== error_mark_node
|| name
== error_mark_node
)
3356 return error_mark_node
;
3358 /* If OBJECT is an ObjC class instance, we must obey ObjC access rules. */
3359 if (!objc_is_public (object
, name
))
3360 return error_mark_node
;
3362 object_type
= TREE_TYPE (object
);
3364 if (processing_template_decl
)
3366 if (/* If OBJECT is dependent, so is OBJECT.NAME. */
3367 type_dependent_object_expression_p (object
)
3368 /* If NAME is "f<args>", where either 'f' or 'args' is
3369 dependent, then the expression is dependent. */
3370 || (TREE_CODE (name
) == TEMPLATE_ID_EXPR
3371 && dependent_template_id_p (TREE_OPERAND (name
, 0),
3372 TREE_OPERAND (name
, 1)))
3373 /* If NAME is "T::X" where "T" is dependent, then the
3374 expression is dependent. */
3375 || (TREE_CODE (name
) == SCOPE_REF
3376 && TYPE_P (TREE_OPERAND (name
, 0))
3377 && dependent_scope_p (TREE_OPERAND (name
, 0)))
3378 /* If NAME is operator T where "T" is dependent, we can't
3379 lookup until we instantiate the T. */
3380 || (TREE_CODE (name
) == IDENTIFIER_NODE
3381 && IDENTIFIER_CONV_OP_P (name
)
3382 && dependent_type_p (TREE_TYPE (name
))))
3385 return build_min_nt_loc (UNKNOWN_LOCATION
, COMPONENT_REF
,
3386 orig_object
, orig_name
, NULL_TREE
);
3388 object
= build_non_dependent_expr (object
);
3390 else if (c_dialect_objc ()
3391 && identifier_p (name
)
3392 && (expr
= objc_maybe_build_component_ref (object
, name
)))
3397 The type of the first expression shall be "class object" (of a
3399 if (!currently_open_class (object_type
)
3400 && !complete_type_or_maybe_complain (object_type
, object
, complain
))
3401 return error_mark_node
;
3402 if (!CLASS_TYPE_P (object_type
))
3404 if (complain
& tf_error
)
3406 if (INDIRECT_TYPE_P (object_type
)
3407 && CLASS_TYPE_P (TREE_TYPE (object_type
)))
3408 error ("request for member %qD in %qE, which is of pointer "
3409 "type %qT (maybe you meant to use %<->%> ?)",
3410 name
, object
.get_value (), object_type
);
3412 error ("request for member %qD in %qE, which is of non-class "
3413 "type %qT", name
, object
.get_value (), object_type
);
3415 return error_mark_node
;
3418 if (BASELINK_P (name
))
3419 /* A member function that has already been looked up. */
3423 bool is_template_id
= false;
3424 tree template_args
= NULL_TREE
;
3425 tree scope
= NULL_TREE
;
3427 access_path
= object_type
;
3429 if (TREE_CODE (name
) == SCOPE_REF
)
3431 /* A qualified name. The qualifying class or namespace `S'
3432 has already been looked up; it is either a TYPE or a
3434 scope
= TREE_OPERAND (name
, 0);
3435 name
= TREE_OPERAND (name
, 1);
3437 /* If SCOPE is a namespace, then the qualified name does not
3438 name a member of OBJECT_TYPE. */
3439 if (TREE_CODE (scope
) == NAMESPACE_DECL
)
3441 if (complain
& tf_error
)
3442 error ("%<%D::%D%> is not a member of %qT",
3443 scope
, name
, object_type
);
3444 return error_mark_node
;
3448 if (TREE_CODE (name
) == TEMPLATE_ID_EXPR
)
3450 is_template_id
= true;
3451 template_args
= TREE_OPERAND (name
, 1);
3452 name
= TREE_OPERAND (name
, 0);
3454 if (!identifier_p (name
))
3455 name
= OVL_NAME (name
);
3460 if (TREE_CODE (scope
) == ENUMERAL_TYPE
)
3462 gcc_assert (!is_template_id
);
3463 /* Looking up a member enumerator (c++/56793). */
3464 if (!TYPE_CLASS_SCOPE_P (scope
)
3465 || !DERIVED_FROM_P (TYPE_CONTEXT (scope
), object_type
))
3467 if (complain
& tf_error
)
3468 error ("%<%D::%D%> is not a member of %qT",
3469 scope
, name
, object_type
);
3470 return error_mark_node
;
3472 tree val
= lookup_enumerator (scope
, name
);
3475 if (complain
& tf_error
)
3476 error ("%qD is not a member of %qD",
3478 return error_mark_node
;
3481 if (TREE_SIDE_EFFECTS (object
))
3482 val
= build2 (COMPOUND_EXPR
, TREE_TYPE (val
), object
, val
);
3486 gcc_assert (CLASS_TYPE_P (scope
));
3487 gcc_assert (identifier_p (name
) || TREE_CODE (name
) == BIT_NOT_EXPR
);
3489 if (constructor_name_p (name
, scope
))
3491 if (complain
& tf_error
)
3492 error ("cannot call constructor %<%T::%D%> directly",
3494 return error_mark_node
;
3497 /* Find the base of OBJECT_TYPE corresponding to SCOPE. */
3498 access_path
= lookup_base (object_type
, scope
, ba_check
,
3500 if (access_path
== error_mark_node
)
3501 return error_mark_node
;
3504 if (any_dependent_bases_p (object_type
))
3506 if (complain
& tf_error
)
3507 error ("%qT is not a base of %qT", scope
, object_type
);
3508 return error_mark_node
;
3512 if (TREE_CODE (name
) == BIT_NOT_EXPR
)
3514 if (dependent_type_p (object_type
))
3515 /* The destructor isn't declared yet. */
3517 member
= lookup_destructor (object
, scope
, name
, complain
);
3521 /* Look up the member. */
3522 access_failure_info afi
;
3523 if (processing_template_decl
)
3524 /* Even though this class member access expression is at this
3525 point not dependent, the member itself may be dependent, and
3526 we must not potentially push a access check for a dependent
3527 member onto TI_DEFERRED_ACCESS_CHECKS. So don't check access
3528 ahead of time here; we're going to redo this member lookup at
3529 instantiation time anyway. */
3530 push_deferring_access_checks (dk_no_check
);
3531 member
= lookup_member (access_path
, name
, /*protect=*/1,
3532 /*want_type=*/false, complain
,
3534 if (processing_template_decl
)
3535 pop_deferring_access_checks ();
3536 afi
.maybe_suggest_accessor (TYPE_READONLY (object_type
));
3537 if (member
== NULL_TREE
)
3539 if (dependent_type_p (object_type
))
3540 /* Try again at instantiation time. */
3542 if (complain
& tf_error
)
3543 complain_about_unrecognized_member (access_path
, name
,
3545 return error_mark_node
;
3547 if (member
== error_mark_node
)
3548 return error_mark_node
;
3550 && any_dependent_type_attributes_p (DECL_ATTRIBUTES (member
)))
3551 /* Dependent type attributes on the decl mean that the TREE_TYPE is
3552 wrong, so don't use it. */
3554 if (TREE_CODE (member
) == USING_DECL
&& DECL_DEPENDENT_P (member
))
3560 tree templ
= member
;
3562 if (BASELINK_P (templ
))
3563 member
= lookup_template_function (templ
, template_args
);
3564 else if (variable_template_p (templ
))
3565 member
= (lookup_and_finish_template_variable
3566 (templ
, template_args
, complain
));
3569 if (complain
& tf_error
)
3570 error ("%qD is not a member template function", name
);
3571 return error_mark_node
;
3576 if (TREE_UNAVAILABLE (member
))
3577 error_unavailable_use (member
, NULL_TREE
);
3578 else if (TREE_DEPRECATED (member
))
3579 warn_deprecated_use (member
, NULL_TREE
);
3582 check_template_keyword (member
);
3584 expr
= build_class_member_access_expr (object
, member
, access_path
,
3585 /*preserve_reference=*/false,
3587 if (processing_template_decl
&& expr
!= error_mark_node
)
3589 if (BASELINK_P (member
))
3591 if (TREE_CODE (orig_name
) == SCOPE_REF
)
3592 BASELINK_QUALIFIED_P (member
) = 1;
3595 return build_min_non_dep (COMPONENT_REF
, expr
,
3596 orig_object
, orig_name
,
3603 /* Build a COMPONENT_REF of OBJECT and MEMBER with the appropriate
3607 build_simple_component_ref (tree object
, tree member
)
3609 tree type
= cp_build_qualified_type (TREE_TYPE (member
),
3610 cp_type_quals (TREE_TYPE (object
)));
3611 return build3_loc (input_location
,
3612 COMPONENT_REF
, type
,
3613 object
, member
, NULL_TREE
);
3616 /* Return an expression for the MEMBER_NAME field in the internal
3617 representation of PTRMEM, a pointer-to-member function. (Each
3618 pointer-to-member function type gets its own RECORD_TYPE so it is
3619 more convenient to access the fields by name than by FIELD_DECL.)
3620 This routine converts the NAME to a FIELD_DECL and then creates the
3621 node for the complete expression. */
3624 build_ptrmemfunc_access_expr (tree ptrmem
, tree member_name
)
3629 if (TREE_CODE (ptrmem
) == CONSTRUCTOR
)
3631 for (auto &e
: CONSTRUCTOR_ELTS (ptrmem
))
3632 if (e
.index
&& DECL_P (e
.index
) && DECL_NAME (e
.index
) == member_name
)
3637 /* This code is a stripped down version of
3638 build_class_member_access_expr. It does not work to use that
3639 routine directly because it expects the object to be of class
3641 ptrmem_type
= TREE_TYPE (ptrmem
);
3642 gcc_assert (TYPE_PTRMEMFUNC_P (ptrmem_type
));
3643 for (member
= TYPE_FIELDS (ptrmem_type
); member
;
3644 member
= DECL_CHAIN (member
))
3645 if (DECL_NAME (member
) == member_name
)
3647 return build_simple_component_ref (ptrmem
, member
);
3650 /* Return a TREE_LIST of namespace-scope overloads for the given operator,
3651 and for any other relevant operator. */
3654 op_unqualified_lookup (tree_code code
, bool is_assign
)
3656 tree lookups
= NULL_TREE
;
3658 if (cxx_dialect
>= cxx20
&& !is_assign
)
3660 if (code
== NE_EXPR
)
3662 /* != can get rewritten in terms of ==. */
3663 tree fnname
= ovl_op_identifier (false, EQ_EXPR
);
3664 if (tree fns
= lookup_name (fnname
, LOOK_where::BLOCK_NAMESPACE
))
3665 lookups
= tree_cons (fnname
, fns
, lookups
);
3667 else if (code
== GT_EXPR
|| code
== LE_EXPR
3668 || code
== LT_EXPR
|| code
== GE_EXPR
)
3670 /* These can get rewritten in terms of <=>. */
3671 tree fnname
= ovl_op_identifier (false, SPACESHIP_EXPR
);
3672 if (tree fns
= lookup_name (fnname
, LOOK_where::BLOCK_NAMESPACE
))
3673 lookups
= tree_cons (fnname
, fns
, lookups
);
3677 tree fnname
= ovl_op_identifier (is_assign
, code
);
3678 if (tree fns
= lookup_name (fnname
, LOOK_where::BLOCK_NAMESPACE
))
3679 lookups
= tree_cons (fnname
, fns
, lookups
);
3684 return build_tree_list (NULL_TREE
, NULL_TREE
);
3687 /* Create a DEPENDENT_OPERATOR_TYPE for a dependent operator expression of
3688 the given operator. LOOKUPS, if non-NULL, is the result of phase 1
3689 name lookup for the given operator. */
3692 build_dependent_operator_type (tree lookups
, tree_code code
, bool is_assign
)
3695 /* We're partially instantiating a dependent operator expression, and
3696 LOOKUPS is the result of phase 1 name lookup that we performed
3697 earlier at template definition time, so just reuse the corresponding
3698 DEPENDENT_OPERATOR_TYPE. */
3699 return TREE_TYPE (lookups
);
3701 /* Otherwise we're processing a dependent operator expression at template
3702 definition time, so perform phase 1 name lookup now. */
3703 lookups
= op_unqualified_lookup (code
, is_assign
);
3705 tree type
= cxx_make_type (DEPENDENT_OPERATOR_TYPE
);
3706 DEPENDENT_OPERATOR_TYPE_SAVED_LOOKUPS (type
) = lookups
;
3707 TREE_TYPE (lookups
) = type
;
3711 /* Given an expression PTR for a pointer, return an expression
3712 for the value pointed to.
3713 ERRORSTRING is the name of the operator to appear in error messages.
3715 This function may need to overload OPERATOR_FNNAME.
3716 Must also handle REFERENCE_TYPEs for C++. */
3719 build_x_indirect_ref (location_t loc
, tree expr
, ref_operator errorstring
,
3720 tree lookups
, tsubst_flags_t complain
)
3722 tree orig_expr
= expr
;
3724 tree overload
= NULL_TREE
;
3726 if (processing_template_decl
)
3728 /* Retain the type if we know the operand is a pointer. */
3729 if (TREE_TYPE (expr
) && INDIRECT_TYPE_P (TREE_TYPE (expr
)))
3731 if (expr
== current_class_ptr
3732 || (TREE_CODE (expr
) == NOP_EXPR
3733 && TREE_OPERAND (expr
, 0) == current_class_ptr
3734 && (same_type_ignoring_top_level_qualifiers_p
3735 (TREE_TYPE (expr
), TREE_TYPE (current_class_ptr
)))))
3736 return current_class_ref
;
3737 return build_min (INDIRECT_REF
, TREE_TYPE (TREE_TYPE (expr
)), expr
);
3739 if (type_dependent_expression_p (expr
))
3741 expr
= build_min_nt_loc (loc
, INDIRECT_REF
, expr
);
3743 = build_dependent_operator_type (lookups
, INDIRECT_REF
, false);
3746 expr
= build_non_dependent_expr (expr
);
3749 rval
= build_new_op (loc
, INDIRECT_REF
, LOOKUP_NORMAL
, expr
,
3750 NULL_TREE
, NULL_TREE
, lookups
,
3751 &overload
, complain
);
3753 rval
= cp_build_indirect_ref (loc
, expr
, errorstring
, complain
);
3755 if (processing_template_decl
&& rval
!= error_mark_node
)
3757 if (overload
!= NULL_TREE
)
3758 return (build_min_non_dep_op_overload
3759 (INDIRECT_REF
, rval
, overload
, orig_expr
));
3761 return build_min_non_dep (INDIRECT_REF
, rval
, orig_expr
);
3767 /* Like c-family strict_aliasing_warning, but don't warn for dependent
3768 types or expressions. */
3771 cp_strict_aliasing_warning (location_t loc
, tree type
, tree expr
)
3773 if (processing_template_decl
)
3777 if (dependent_type_p (type
) || type_dependent_expression_p (e
))
3780 return strict_aliasing_warning (loc
, type
, expr
);
3783 /* The implementation of the above, and of indirection implied by other
3784 constructs. If DO_FOLD is true, fold away INDIRECT_REF of ADDR_EXPR. */
3787 cp_build_indirect_ref_1 (location_t loc
, tree ptr
, ref_operator errorstring
,
3788 tsubst_flags_t complain
, bool do_fold
)
3792 /* RO_NULL should only be used with the folding entry points below, not
3793 cp_build_indirect_ref. */
3794 gcc_checking_assert (errorstring
!= RO_NULL
|| do_fold
);
3796 if (ptr
== current_class_ptr
3797 || (TREE_CODE (ptr
) == NOP_EXPR
3798 && TREE_OPERAND (ptr
, 0) == current_class_ptr
3799 && (same_type_ignoring_top_level_qualifiers_p
3800 (TREE_TYPE (ptr
), TREE_TYPE (current_class_ptr
)))))
3801 return current_class_ref
;
3803 pointer
= (TYPE_REF_P (TREE_TYPE (ptr
))
3804 ? ptr
: decay_conversion (ptr
, complain
));
3805 if (pointer
== error_mark_node
)
3806 return error_mark_node
;
3808 type
= TREE_TYPE (pointer
);
3810 if (INDIRECT_TYPE_P (type
))
3814 If the type of the expression is "pointer to T," the type
3815 of the result is "T." */
3816 tree t
= TREE_TYPE (type
);
3818 if ((CONVERT_EXPR_P (ptr
)
3819 || TREE_CODE (ptr
) == VIEW_CONVERT_EXPR
)
3820 && (!CLASS_TYPE_P (t
) || !CLASSTYPE_EMPTY_P (t
)))
3822 /* If a warning is issued, mark it to avoid duplicates from
3823 the backend. This only needs to be done at
3824 warn_strict_aliasing > 2. */
3825 if (warn_strict_aliasing
> 2
3826 && cp_strict_aliasing_warning (EXPR_LOCATION (ptr
),
3827 type
, TREE_OPERAND (ptr
, 0)))
3828 suppress_warning (ptr
, OPT_Wstrict_aliasing
);
3831 if (VOID_TYPE_P (t
))
3833 /* A pointer to incomplete type (other than cv void) can be
3834 dereferenced [expr.unary.op]/1 */
3835 if (complain
& tf_error
)
3836 error_at (loc
, "%qT is not a pointer-to-object type", type
);
3837 return error_mark_node
;
3839 else if (do_fold
&& TREE_CODE (pointer
) == ADDR_EXPR
3840 && same_type_p (t
, TREE_TYPE (TREE_OPERAND (pointer
, 0))))
3841 /* The POINTER was something like `&x'. We simplify `*&x' to
3843 return TREE_OPERAND (pointer
, 0);
3846 tree ref
= build1 (INDIRECT_REF
, t
, pointer
);
3848 /* We *must* set TREE_READONLY when dereferencing a pointer to const,
3849 so that we get the proper error message if the result is used
3850 to assign to. Also, &* is supposed to be a no-op. */
3851 TREE_READONLY (ref
) = CP_TYPE_CONST_P (t
);
3852 TREE_THIS_VOLATILE (ref
) = CP_TYPE_VOLATILE_P (t
);
3853 TREE_SIDE_EFFECTS (ref
)
3854 = (TREE_THIS_VOLATILE (ref
) || TREE_SIDE_EFFECTS (pointer
));
3858 else if (!(complain
& tf_error
))
3859 /* Don't emit any errors; we'll just return ERROR_MARK_NODE later. */
3861 /* `pointer' won't be an error_mark_node if we were given a
3862 pointer to member, so it's cool to check for this here. */
3863 else if (TYPE_PTRMEM_P (type
))
3864 switch (errorstring
)
3866 case RO_ARRAY_INDEXING
:
3868 "invalid use of array indexing on pointer to member");
3871 error_at (loc
, "invalid use of unary %<*%> on pointer to member");
3873 case RO_IMPLICIT_CONVERSION
:
3874 error_at (loc
, "invalid use of implicit conversion on pointer "
3878 error_at (loc
, "left hand operand of %<->*%> must be a pointer to "
3879 "class, but is a pointer to member of type %qT", type
);
3884 else if (pointer
!= error_mark_node
)
3885 invalid_indirection_error (loc
, type
, errorstring
);
3887 return error_mark_node
;
3890 /* Entry point used by c-common, which expects folding. */
3893 build_indirect_ref (location_t loc
, tree ptr
, ref_operator errorstring
)
3895 return cp_build_indirect_ref_1 (loc
, ptr
, errorstring
,
3896 tf_warning_or_error
, true);
3899 /* Entry point used by internal indirection needs that don't correspond to any
3900 syntactic construct. */
3903 cp_build_fold_indirect_ref (tree pointer
)
3905 return cp_build_indirect_ref_1 (input_location
, pointer
, RO_NULL
,
3906 tf_warning_or_error
, true);
3909 /* Entry point used by indirection needs that correspond to some syntactic
3913 cp_build_indirect_ref (location_t loc
, tree ptr
, ref_operator errorstring
,
3914 tsubst_flags_t complain
)
3916 return cp_build_indirect_ref_1 (loc
, ptr
, errorstring
, complain
, false);
3919 /* This handles expressions of the form "a[i]", which denotes
3922 This is logically equivalent in C to *(a+i), but we may do it differently.
3923 If A is a variable or a member, we generate a primitive ARRAY_REF.
3924 This avoids forcing the array out of registers, and can work on
3925 arrays that are not lvalues (for example, members of structures returned
3928 If INDEX is of some user-defined type, it must be converted to
3929 integer type. Otherwise, to make a compatible PLUS_EXPR, it
3930 will inherit the type of the array, which will be some pointer type.
3932 LOC is the location to use in building the array reference. */
3935 cp_build_array_ref (location_t loc
, tree array
, tree idx
,
3936 tsubst_flags_t complain
)
3942 if (complain
& tf_error
)
3943 error_at (loc
, "subscript missing in array reference");
3944 return error_mark_node
;
3947 if (TREE_TYPE (array
) == error_mark_node
3948 || TREE_TYPE (idx
) == error_mark_node
)
3949 return error_mark_node
;
3951 /* If ARRAY is a COMPOUND_EXPR or COND_EXPR, move our reference
3953 switch (TREE_CODE (array
))
3957 tree value
= cp_build_array_ref (loc
, TREE_OPERAND (array
, 1), idx
,
3959 ret
= build2 (COMPOUND_EXPR
, TREE_TYPE (value
),
3960 TREE_OPERAND (array
, 0), value
);
3961 SET_EXPR_LOCATION (ret
, loc
);
3966 ret
= build_conditional_expr
3967 (loc
, TREE_OPERAND (array
, 0),
3968 cp_build_array_ref (loc
, TREE_OPERAND (array
, 1), idx
,
3970 cp_build_array_ref (loc
, TREE_OPERAND (array
, 2), idx
,
3973 protected_set_expr_location (ret
, loc
);
3980 bool non_lvalue
= convert_vector_to_array_for_subscript (loc
, &array
, idx
);
3982 if (TREE_CODE (TREE_TYPE (array
)) == ARRAY_TYPE
)
3986 warn_array_subscript_with_type_char (loc
, idx
);
3988 if (!INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (TREE_TYPE (idx
)))
3990 if (complain
& tf_error
)
3991 error_at (loc
, "array subscript is not an integer");
3992 return error_mark_node
;
3995 /* Apply integral promotions *after* noticing character types.
3996 (It is unclear why we do these promotions -- the standard
3997 does not say that we should. In fact, the natural thing would
3998 seem to be to convert IDX to ptrdiff_t; we're performing
3999 pointer arithmetic.) */
4000 idx
= cp_perform_integral_promotions (idx
, complain
);
4002 idx
= maybe_fold_non_dependent_expr (idx
, complain
);
4004 /* An array that is indexed by a non-constant
4005 cannot be stored in a register; we must be able to do
4006 address arithmetic on its address.
4007 Likewise an array of elements of variable size. */
4008 if (TREE_CODE (idx
) != INTEGER_CST
4009 || (COMPLETE_TYPE_P (TREE_TYPE (TREE_TYPE (array
)))
4010 && (TREE_CODE (TYPE_SIZE (TREE_TYPE (TREE_TYPE (array
))))
4013 if (!cxx_mark_addressable (array
, true))
4014 return error_mark_node
;
4017 /* An array that is indexed by a constant value which is not within
4018 the array bounds cannot be stored in a register either; because we
4019 would get a crash in store_bit_field/extract_bit_field when trying
4020 to access a non-existent part of the register. */
4021 if (TREE_CODE (idx
) == INTEGER_CST
4022 && TYPE_DOMAIN (TREE_TYPE (array
))
4023 && ! int_fits_type_p (idx
, TYPE_DOMAIN (TREE_TYPE (array
))))
4025 if (!cxx_mark_addressable (array
))
4026 return error_mark_node
;
4029 /* Note in C++ it is valid to subscript a `register' array, since
4030 it is valid to take the address of something with that
4031 storage specification. */
4035 while (TREE_CODE (foo
) == COMPONENT_REF
)
4036 foo
= TREE_OPERAND (foo
, 0);
4037 if (VAR_P (foo
) && DECL_REGISTER (foo
)
4038 && (complain
& tf_warning
))
4039 warning_at (loc
, OPT_Wextra
,
4040 "subscripting array declared %<register%>");
4043 type
= TREE_TYPE (TREE_TYPE (array
));
4044 rval
= build4 (ARRAY_REF
, type
, array
, idx
, NULL_TREE
, NULL_TREE
);
4045 /* Array ref is const/volatile if the array elements are
4046 or if the array is.. */
4047 TREE_READONLY (rval
)
4048 |= (CP_TYPE_CONST_P (type
) | TREE_READONLY (array
));
4049 TREE_SIDE_EFFECTS (rval
)
4050 |= (CP_TYPE_VOLATILE_P (type
) | TREE_SIDE_EFFECTS (array
));
4051 TREE_THIS_VOLATILE (rval
)
4052 |= (CP_TYPE_VOLATILE_P (type
) | TREE_THIS_VOLATILE (array
));
4053 ret
= require_complete_type (rval
, complain
);
4054 protected_set_expr_location (ret
, loc
);
4056 ret
= non_lvalue_loc (loc
, ret
);
4061 tree ar
= cp_default_conversion (array
, complain
);
4062 tree ind
= cp_default_conversion (idx
, complain
);
4063 tree first
= NULL_TREE
;
4065 if (flag_strong_eval_order
== 2 && TREE_SIDE_EFFECTS (ind
))
4066 ar
= first
= save_expr (ar
);
4068 /* Put the integer in IND to simplify error checking. */
4069 if (TREE_CODE (TREE_TYPE (ar
)) == INTEGER_TYPE
)
4070 std::swap (ar
, ind
);
4072 if (ar
== error_mark_node
|| ind
== error_mark_node
)
4073 return error_mark_node
;
4075 if (!TYPE_PTR_P (TREE_TYPE (ar
)))
4077 if (complain
& tf_error
)
4078 error_at (loc
, "subscripted value is neither array nor pointer");
4079 return error_mark_node
;
4081 if (TREE_CODE (TREE_TYPE (ind
)) != INTEGER_TYPE
)
4083 if (complain
& tf_error
)
4084 error_at (loc
, "array subscript is not an integer");
4085 return error_mark_node
;
4088 warn_array_subscript_with_type_char (loc
, idx
);
4090 ret
= cp_build_binary_op (input_location
, PLUS_EXPR
, ar
, ind
, complain
);
4092 ret
= build2_loc (loc
, COMPOUND_EXPR
, TREE_TYPE (ret
), first
, ret
);
4093 ret
= cp_build_indirect_ref (loc
, ret
, RO_ARRAY_INDEXING
, complain
);
4094 protected_set_expr_location (ret
, loc
);
4096 ret
= non_lvalue_loc (loc
, ret
);
4101 /* Entry point for Obj-C++. */
4104 build_array_ref (location_t loc
, tree array
, tree idx
)
4106 return cp_build_array_ref (loc
, array
, idx
, tf_warning_or_error
);
4109 /* Resolve a pointer to member function. INSTANCE is the object
4110 instance to use, if the member points to a virtual member.
4112 This used to avoid checking for virtual functions if basetype
4113 has no virtual functions, according to an earlier ANSI draft.
4114 With the final ISO C++ rules, such an optimization is
4115 incorrect: A pointer to a derived member can be static_cast
4116 to pointer-to-base-member, as long as the dynamic object
4117 later has the right member. So now we only do this optimization
4118 when we know the dynamic type of the object. */
4121 get_member_function_from_ptrfunc (tree
*instance_ptrptr
, tree function
,
4122 tsubst_flags_t complain
)
4124 if (TREE_CODE (function
) == OFFSET_REF
)
4125 function
= TREE_OPERAND (function
, 1);
4127 if (TYPE_PTRMEMFUNC_P (TREE_TYPE (function
)))
4129 tree idx
, delta
, e1
, e2
, e3
, vtbl
;
4131 tree fntype
= TYPE_PTRMEMFUNC_FN_TYPE (TREE_TYPE (function
));
4132 tree basetype
= TYPE_METHOD_BASETYPE (TREE_TYPE (fntype
));
4134 tree instance_ptr
= *instance_ptrptr
;
4135 tree instance_save_expr
= 0;
4136 if (instance_ptr
== error_mark_node
)
4138 if (TREE_CODE (function
) == PTRMEM_CST
)
4140 /* Extracting the function address from a pmf is only
4141 allowed with -Wno-pmf-conversions. It only works for
4143 e1
= build_addr_func (PTRMEM_CST_MEMBER (function
), complain
);
4144 e1
= convert (fntype
, e1
);
4149 if (complain
& tf_error
)
4150 error ("object missing in use of %qE", function
);
4151 return error_mark_node
;
4155 /* True if we know that the dynamic type of the object doesn't have
4156 virtual functions, so we can assume the PFN field is a pointer. */
4157 nonvirtual
= (COMPLETE_TYPE_P (basetype
)
4158 && !TYPE_POLYMORPHIC_P (basetype
)
4159 && resolves_to_fixed_type_p (instance_ptr
, 0));
4161 /* If we don't really have an object (i.e. in an ill-formed
4162 conversion from PMF to pointer), we can't resolve virtual
4163 functions anyway. */
4164 if (!nonvirtual
&& is_dummy_object (instance_ptr
))
4167 if (TREE_SIDE_EFFECTS (instance_ptr
))
4168 instance_ptr
= instance_save_expr
= save_expr (instance_ptr
);
4170 if (TREE_SIDE_EFFECTS (function
))
4171 function
= save_expr (function
);
4173 /* Start by extracting all the information from the PMF itself. */
4174 e3
= pfn_from_ptrmemfunc (function
);
4175 delta
= delta_from_ptrmemfunc (function
);
4176 idx
= build1 (NOP_EXPR
, vtable_index_type
, e3
);
4177 switch (TARGET_PTRMEMFUNC_VBIT_LOCATION
)
4179 int flag_sanitize_save
;
4180 case ptrmemfunc_vbit_in_pfn
:
4181 e1
= cp_build_binary_op (input_location
,
4182 BIT_AND_EXPR
, idx
, integer_one_node
,
4184 idx
= cp_build_binary_op (input_location
,
4185 MINUS_EXPR
, idx
, integer_one_node
,
4187 if (idx
== error_mark_node
)
4188 return error_mark_node
;
4191 case ptrmemfunc_vbit_in_delta
:
4192 e1
= cp_build_binary_op (input_location
,
4193 BIT_AND_EXPR
, delta
, integer_one_node
,
4195 /* Don't instrument the RSHIFT_EXPR we're about to create because
4196 we're going to use DELTA number of times, and that wouldn't play
4197 well with SAVE_EXPRs therein. */
4198 flag_sanitize_save
= flag_sanitize
;
4200 delta
= cp_build_binary_op (input_location
,
4201 RSHIFT_EXPR
, delta
, integer_one_node
,
4203 flag_sanitize
= flag_sanitize_save
;
4204 if (delta
== error_mark_node
)
4205 return error_mark_node
;
4212 if (e1
== error_mark_node
)
4213 return error_mark_node
;
4215 /* Convert down to the right base before using the instance. A
4216 special case is that in a pointer to member of class C, C may
4217 be incomplete. In that case, the function will of course be
4218 a member of C, and no conversion is required. In fact,
4219 lookup_base will fail in that case, because incomplete
4220 classes do not have BINFOs. */
4221 if (!same_type_ignoring_top_level_qualifiers_p
4222 (basetype
, TREE_TYPE (TREE_TYPE (instance_ptr
))))
4224 basetype
= lookup_base (TREE_TYPE (TREE_TYPE (instance_ptr
)),
4225 basetype
, ba_check
, NULL
, complain
);
4226 instance_ptr
= build_base_path (PLUS_EXPR
, instance_ptr
, basetype
,
4228 if (instance_ptr
== error_mark_node
)
4229 return error_mark_node
;
4231 /* ...and then the delta in the PMF. */
4232 instance_ptr
= fold_build_pointer_plus (instance_ptr
, delta
);
4234 /* Hand back the adjusted 'this' argument to our caller. */
4235 *instance_ptrptr
= instance_ptr
;
4238 /* Now just return the pointer. */
4241 /* Next extract the vtable pointer from the object. */
4242 vtbl
= build1 (NOP_EXPR
, build_pointer_type (vtbl_ptr_type_node
),
4244 vtbl
= cp_build_fold_indirect_ref (vtbl
);
4245 if (vtbl
== error_mark_node
)
4246 return error_mark_node
;
4248 /* Finally, extract the function pointer from the vtable. */
4249 e2
= fold_build_pointer_plus_loc (input_location
, vtbl
, idx
);
4250 e2
= cp_build_fold_indirect_ref (e2
);
4251 if (e2
== error_mark_node
)
4252 return error_mark_node
;
4253 TREE_CONSTANT (e2
) = 1;
4255 /* When using function descriptors, the address of the
4256 vtable entry is treated as a function pointer. */
4257 if (TARGET_VTABLE_USES_DESCRIPTORS
)
4258 e2
= build1 (NOP_EXPR
, TREE_TYPE (e2
),
4259 cp_build_addr_expr (e2
, complain
));
4261 e2
= fold_convert (TREE_TYPE (e3
), e2
);
4262 e1
= build_conditional_expr (input_location
, e1
, e2
, e3
, complain
);
4263 if (e1
== error_mark_node
)
4264 return error_mark_node
;
4266 /* Make sure this doesn't get evaluated first inside one of the
4267 branches of the COND_EXPR. */
4268 if (instance_save_expr
)
4269 e1
= build2 (COMPOUND_EXPR
, TREE_TYPE (e1
),
4270 instance_save_expr
, e1
);
4277 /* Used by the C-common bits. */
4279 build_function_call (location_t
/*loc*/,
4280 tree function
, tree params
)
4282 return cp_build_function_call (function
, params
, tf_warning_or_error
);
4285 /* Used by the C-common bits. */
4287 build_function_call_vec (location_t
/*loc*/, vec
<location_t
> /*arg_loc*/,
4288 tree function
, vec
<tree
, va_gc
> *params
,
4289 vec
<tree
, va_gc
> * /*origtypes*/, tree orig_function
)
4291 vec
<tree
, va_gc
> *orig_params
= params
;
4292 tree ret
= cp_build_function_call_vec (function
, ¶ms
,
4293 tf_warning_or_error
, orig_function
);
4295 /* cp_build_function_call_vec can reallocate PARAMS by adding
4296 default arguments. That should never happen here. Verify
4298 gcc_assert (params
== orig_params
);
4303 /* Build a function call using a tree list of arguments. */
4306 cp_build_function_call (tree function
, tree params
, tsubst_flags_t complain
)
4311 for (; params
!= NULL_TREE
; params
= TREE_CHAIN (params
))
4312 vec_safe_push (vec
, TREE_VALUE (params
));
4313 ret
= cp_build_function_call_vec (function
, &vec
, complain
);
4317 /* Build a function call using varargs. */
4320 cp_build_function_call_nary (tree function
, tsubst_flags_t complain
, ...)
4326 va_start (args
, complain
);
4327 for (t
= va_arg (args
, tree
); t
!= NULL_TREE
; t
= va_arg (args
, tree
))
4328 vec_safe_push (vec
, t
);
4330 ret
= cp_build_function_call_vec (function
, &vec
, complain
);
4334 /* Build a function call using a vector of arguments.
4335 If FUNCTION is the result of resolving an overloaded target built-in,
4336 ORIG_FNDECL is the original function decl, otherwise it is null.
4337 PARAMS may be NULL if there are no parameters. This changes the
4338 contents of PARAMS. */
4341 cp_build_function_call_vec (tree function
, vec
<tree
, va_gc
> **params
,
4342 tsubst_flags_t complain
, tree orig_fndecl
)
4344 tree fntype
, fndecl
;
4346 tree original
= function
;
4350 vec
<tree
, va_gc
> *allocated
= NULL
;
4353 /* For Objective-C, convert any calls via a cast to OBJC_TYPE_REF
4354 expressions, like those used for ObjC messenger dispatches. */
4355 if (params
!= NULL
&& !vec_safe_is_empty (*params
))
4356 function
= objc_rewrite_function_call (function
, (**params
)[0]);
4358 /* build_c_cast puts on a NOP_EXPR to make the result not an lvalue.
4359 Strip such NOP_EXPRs, since FUNCTION is used in non-lvalue context. */
4360 if (TREE_CODE (function
) == NOP_EXPR
4361 && TREE_TYPE (function
) == TREE_TYPE (TREE_OPERAND (function
, 0)))
4362 function
= TREE_OPERAND (function
, 0);
4364 if (TREE_CODE (function
) == FUNCTION_DECL
)
4366 if (!mark_used (function
, complain
))
4367 return error_mark_node
;
4370 /* Convert anything with function type to a pointer-to-function. */
4371 if (DECL_MAIN_P (function
))
4373 if (complain
& tf_error
)
4374 pedwarn (input_location
, OPT_Wpedantic
,
4375 "ISO C++ forbids calling %<::main%> from within program");
4377 return error_mark_node
;
4379 function
= build_addr_func (function
, complain
);
4385 function
= build_addr_func (function
, complain
);
4388 if (function
== error_mark_node
)
4389 return error_mark_node
;
4391 fntype
= TREE_TYPE (function
);
4393 if (TYPE_PTRMEMFUNC_P (fntype
))
4395 if (complain
& tf_error
)
4396 error ("must use %<.*%> or %<->*%> to call pointer-to-member "
4397 "function in %<%E (...)%>, e.g. %<(... ->* %E) (...)%>",
4398 original
, original
);
4399 return error_mark_node
;
4402 is_method
= (TYPE_PTR_P (fntype
)
4403 && TREE_CODE (TREE_TYPE (fntype
)) == METHOD_TYPE
);
4405 if (!(TYPE_PTRFN_P (fntype
)
4407 || TREE_CODE (function
) == TEMPLATE_ID_EXPR
))
4409 if (complain
& tf_error
)
4411 if (!flag_diagnostics_show_caret
)
4412 error_at (input_location
,
4413 "%qE cannot be used as a function", original
);
4414 else if (DECL_P (original
))
4415 error_at (input_location
,
4416 "%qD cannot be used as a function", original
);
4418 error_at (input_location
,
4419 "expression cannot be used as a function");
4422 return error_mark_node
;
4425 /* fntype now gets the type of function pointed to. */
4426 fntype
= TREE_TYPE (fntype
);
4427 parm_types
= TYPE_ARG_TYPES (fntype
);
4431 allocated
= make_tree_vector ();
4432 params
= &allocated
;
4435 nargs
= convert_arguments (parm_types
, params
, fndecl
, LOOKUP_NORMAL
,
4438 return error_mark_node
;
4440 argarray
= (*params
)->address ();
4442 /* Check for errors in format strings and inappropriately
4444 bool warned_p
= check_function_arguments (input_location
, fndecl
, fntype
,
4445 nargs
, argarray
, NULL
);
4447 ret
= build_cxx_call (function
, nargs
, argarray
, complain
, orig_fndecl
);
4451 tree c
= extract_call_expr (ret
);
4452 if (TREE_CODE (c
) == CALL_EXPR
)
4453 suppress_warning (c
, OPT_Wnonnull
);
4456 if (allocated
!= NULL
)
4457 release_tree_vector (allocated
);
4462 /* Subroutine of convert_arguments.
4463 Print an error message about a wrong number of arguments. */
4466 error_args_num (location_t loc
, tree fndecl
, bool too_many_p
)
4470 if (TREE_CODE (TREE_TYPE (fndecl
)) == METHOD_TYPE
)
4472 if (DECL_NAME (fndecl
) == NULL_TREE
4473 || (DECL_NAME (fndecl
)
4474 == DECL_NAME (TYPE_NAME (DECL_CONTEXT (fndecl
)))))
4477 ? G_("too many arguments to constructor %q#D")
4478 : G_("too few arguments to constructor %q#D"),
4483 ? G_("too many arguments to member function %q#D")
4484 : G_("too few arguments to member function %q#D"),
4490 ? G_("too many arguments to function %q#D")
4491 : G_("too few arguments to function %q#D"),
4493 if (!DECL_IS_UNDECLARED_BUILTIN (fndecl
))
4494 inform (DECL_SOURCE_LOCATION (fndecl
), "declared here");
4498 if (c_dialect_objc () && objc_message_selector ())
4501 ? G_("too many arguments to method %q#D")
4502 : G_("too few arguments to method %q#D"),
4503 objc_message_selector ());
4505 error_at (loc
, too_many_p
? G_("too many arguments to function")
4506 : G_("too few arguments to function"));
4510 /* Convert the actual parameter expressions in the list VALUES to the
4511 types in the list TYPELIST. The converted expressions are stored
4512 back in the VALUES vector.
4513 If parmdecls is exhausted, or when an element has NULL as its type,
4514 perform the default conversions.
4516 NAME is an IDENTIFIER_NODE or 0. It is used only for error messages.
4518 This is also where warnings about wrong number of args are generated.
4520 Returns the actual number of arguments processed (which might be less
4521 than the length of the vector), or -1 on error.
4523 In C++, unspecified trailing parameters can be filled in with their
4524 default arguments, if such were specified. Do so here. */
4527 convert_arguments (tree typelist
, vec
<tree
, va_gc
> **values
, tree fndecl
,
4528 int flags
, tsubst_flags_t complain
)
4533 /* Argument passing is always copy-initialization. */
4534 flags
|= LOOKUP_ONLYCONVERTING
;
4536 for (i
= 0, typetail
= typelist
;
4537 i
< vec_safe_length (*values
);
4540 tree type
= typetail
? TREE_VALUE (typetail
) : 0;
4541 tree val
= (**values
)[i
];
4543 if (val
== error_mark_node
|| type
== error_mark_node
)
4546 if (type
== void_type_node
)
4548 if (complain
& tf_error
)
4550 error_args_num (input_location
, fndecl
, /*too_many_p=*/true);
4557 /* build_c_cast puts on a NOP_EXPR to make the result not an lvalue.
4558 Strip such NOP_EXPRs, since VAL is used in non-lvalue context. */
4559 if (TREE_CODE (val
) == NOP_EXPR
4560 && TREE_TYPE (val
) == TREE_TYPE (TREE_OPERAND (val
, 0))
4561 && (type
== 0 || !TYPE_REF_P (type
)))
4562 val
= TREE_OPERAND (val
, 0);
4564 if (type
== 0 || !TYPE_REF_P (type
))
4566 if (TREE_CODE (TREE_TYPE (val
)) == ARRAY_TYPE
4567 || FUNC_OR_METHOD_TYPE_P (TREE_TYPE (val
)))
4568 val
= decay_conversion (val
, complain
);
4571 if (val
== error_mark_node
)
4576 /* Formal parm type is specified by a function prototype. */
4579 if (!COMPLETE_TYPE_P (complete_type (type
)))
4581 if (complain
& tf_error
)
4583 location_t loc
= EXPR_LOC_OR_LOC (val
, input_location
);
4586 auto_diagnostic_group d
;
4588 "parameter %P of %qD has incomplete type %qT",
4590 inform (get_fndecl_argument_location (fndecl
, i
),
4594 error_at (loc
, "parameter %P has incomplete type %qT", i
,
4597 parmval
= error_mark_node
;
4601 parmval
= convert_for_initialization
4602 (NULL_TREE
, type
, val
, flags
,
4603 ICR_ARGPASS
, fndecl
, i
, complain
);
4604 parmval
= convert_for_arg_passing (type
, parmval
, complain
);
4607 if (parmval
== error_mark_node
)
4610 (**values
)[i
] = parmval
;
4614 int magic
= fndecl
? magic_varargs_p (fndecl
) : 0;
4617 /* Don't truncate excess precision to the semantic type. */
4618 if (magic
== 1 && TREE_CODE (val
) == EXCESS_PRECISION_EXPR
)
4619 val
= TREE_OPERAND (val
, 0);
4620 /* Don't do ellipsis conversion for __built_in_constant_p
4621 as this will result in spurious errors for non-trivial
4623 val
= require_complete_type (val
, complain
);
4626 val
= convert_arg_to_ellipsis (val
, complain
);
4628 (**values
)[i
] = val
;
4632 typetail
= TREE_CHAIN (typetail
);
4635 if (typetail
!= 0 && typetail
!= void_list_node
)
4637 /* See if there are default arguments that can be used. Because
4638 we hold default arguments in the FUNCTION_TYPE (which is so
4639 wrong), we can see default parameters here from deduced
4640 contexts (and via typeof) for indirect function calls.
4641 Fortunately we know whether we have a function decl to
4642 provide default arguments in a language conformant
4644 if (fndecl
&& TREE_PURPOSE (typetail
)
4645 && TREE_CODE (TREE_PURPOSE (typetail
)) != DEFERRED_PARSE
)
4647 for (; typetail
!= void_list_node
; ++i
)
4649 /* After DR777, with explicit template args we can end up with a
4650 default argument followed by no default argument. */
4651 if (!TREE_PURPOSE (typetail
))
4654 = convert_default_arg (TREE_VALUE (typetail
),
4655 TREE_PURPOSE (typetail
),
4656 fndecl
, i
, complain
);
4658 if (parmval
== error_mark_node
)
4661 vec_safe_push (*values
, parmval
);
4662 typetail
= TREE_CHAIN (typetail
);
4663 /* ends with `...'. */
4664 if (typetail
== NULL_TREE
)
4669 if (typetail
&& typetail
!= void_list_node
)
4671 if (complain
& tf_error
)
4672 error_args_num (input_location
, fndecl
, /*too_many_p=*/false);
4680 /* Build a binary-operation expression, after performing default
4681 conversions on the operands. CODE is the kind of expression to
4682 build. ARG1 and ARG2 are the arguments. ARG1_CODE and ARG2_CODE
4683 are the tree codes which correspond to ARG1 and ARG2 when issuing
4684 warnings about possibly misplaced parentheses. They may differ
4685 from the TREE_CODE of ARG1 and ARG2 if the parser has done constant
4686 folding (e.g., if the parser sees "a | 1 + 1", it may call this
4687 routine with ARG2 being an INTEGER_CST and ARG2_CODE == PLUS_EXPR).
4688 To avoid issuing any parentheses warnings, pass ARG1_CODE and/or
4689 ARG2_CODE as ERROR_MARK. */
4692 build_x_binary_op (const op_location_t
&loc
, enum tree_code code
, tree arg1
,
4693 enum tree_code arg1_code
, tree arg2
,
4694 enum tree_code arg2_code
, tree lookups
,
4695 tree
*overload_p
, tsubst_flags_t complain
)
4700 tree overload
= NULL_TREE
;
4705 if (processing_template_decl
)
4707 if (type_dependent_expression_p (arg1
)
4708 || type_dependent_expression_p (arg2
))
4710 expr
= build_min_nt_loc (loc
, code
, arg1
, arg2
);
4712 = build_dependent_operator_type (lookups
, code
, false);
4715 arg1
= build_non_dependent_expr (arg1
);
4716 arg2
= build_non_dependent_expr (arg2
);
4719 if (code
== DOTSTAR_EXPR
)
4720 expr
= build_m_component_ref (arg1
, arg2
, complain
);
4722 expr
= build_new_op (loc
, code
, LOOKUP_NORMAL
, arg1
, arg2
, NULL_TREE
,
4723 lookups
, &overload
, complain
);
4725 if (overload_p
!= NULL
)
4726 *overload_p
= overload
;
4728 /* Check for cases such as x+y<<z which users are likely to
4729 misinterpret. But don't warn about obj << x + y, since that is a
4730 common idiom for I/O. */
4731 if (warn_parentheses
4732 && (complain
& tf_warning
)
4733 && !processing_template_decl
4734 && !error_operand_p (arg1
)
4735 && !error_operand_p (arg2
)
4736 && (code
!= LSHIFT_EXPR
4737 || !CLASS_TYPE_P (TREE_TYPE (arg1
))))
4738 warn_about_parentheses (loc
, code
, arg1_code
, orig_arg1
,
4739 arg2_code
, orig_arg2
);
4741 if (processing_template_decl
&& expr
!= error_mark_node
)
4743 if (overload
!= NULL_TREE
)
4744 return (build_min_non_dep_op_overload
4745 (code
, expr
, overload
, orig_arg1
, orig_arg2
));
4747 return build_min_non_dep (code
, expr
, orig_arg1
, orig_arg2
);
4753 /* Build and return an ARRAY_REF expression. */
4756 build_x_array_ref (location_t loc
, tree arg1
, tree arg2
,
4757 tsubst_flags_t complain
)
4759 tree orig_arg1
= arg1
;
4760 tree orig_arg2
= arg2
;
4762 tree overload
= NULL_TREE
;
4764 if (processing_template_decl
)
4766 if (type_dependent_expression_p (arg1
)
4767 || type_dependent_expression_p (arg2
))
4768 return build_min_nt_loc (loc
, ARRAY_REF
, arg1
, arg2
,
4769 NULL_TREE
, NULL_TREE
);
4770 arg1
= build_non_dependent_expr (arg1
);
4771 arg2
= build_non_dependent_expr (arg2
);
4774 expr
= build_new_op (loc
, ARRAY_REF
, LOOKUP_NORMAL
, arg1
, arg2
,
4775 NULL_TREE
, NULL_TREE
, &overload
, complain
);
4777 if (processing_template_decl
&& expr
!= error_mark_node
)
4779 if (overload
!= NULL_TREE
)
4780 return (build_min_non_dep_op_overload
4781 (ARRAY_REF
, expr
, overload
, orig_arg1
, orig_arg2
));
4783 return build_min_non_dep (ARRAY_REF
, expr
, orig_arg1
, orig_arg2
,
4784 NULL_TREE
, NULL_TREE
);
4789 /* Return whether OP is an expression of enum type cast to integer
4790 type. In C++ even unsigned enum types are cast to signed integer
4791 types. We do not want to issue warnings about comparisons between
4792 signed and unsigned types when one of the types is an enum type.
4793 Those warnings are always false positives in practice. */
4796 enum_cast_to_int (tree op
)
4798 if (CONVERT_EXPR_P (op
)
4799 && TREE_TYPE (op
) == integer_type_node
4800 && TREE_CODE (TREE_TYPE (TREE_OPERAND (op
, 0))) == ENUMERAL_TYPE
4801 && TYPE_UNSIGNED (TREE_TYPE (TREE_OPERAND (op
, 0))))
4804 /* The cast may have been pushed into a COND_EXPR. */
4805 if (TREE_CODE (op
) == COND_EXPR
)
4806 return (enum_cast_to_int (TREE_OPERAND (op
, 1))
4807 || enum_cast_to_int (TREE_OPERAND (op
, 2)));
4812 /* For the c-common bits. */
4814 build_binary_op (location_t location
, enum tree_code code
, tree op0
, tree op1
,
4817 return cp_build_binary_op (location
, code
, op0
, op1
, tf_warning_or_error
);
4820 /* Build a vector comparison of ARG0 and ARG1 using CODE opcode
4821 into a value of TYPE type. Comparison is done via VEC_COND_EXPR. */
4824 build_vec_cmp (tree_code code
, tree type
,
4825 tree arg0
, tree arg1
)
4827 tree zero_vec
= build_zero_cst (type
);
4828 tree minus_one_vec
= build_minus_one_cst (type
);
4829 tree cmp_type
= truth_type_for (type
);
4830 tree cmp
= build2 (code
, cmp_type
, arg0
, arg1
);
4831 return build3 (VEC_COND_EXPR
, type
, cmp
, minus_one_vec
, zero_vec
);
4834 /* Possibly warn about an address never being NULL. */
4837 warn_for_null_address (location_t location
, tree op
, tsubst_flags_t complain
)
4839 /* Prevent warnings issued for macro expansion. */
4841 || (complain
& tf_warning
) == 0
4842 || c_inhibit_evaluation_warnings
!= 0
4843 || from_macro_expansion_at (location
)
4844 || warning_suppressed_p (op
, OPT_Waddress
))
4847 if (TREE_CODE (op
) == NON_DEPENDENT_EXPR
)
4848 op
= TREE_OPERAND (op
, 0);
4850 tree cop
= fold_for_warn (op
);
4852 if (TREE_CODE (cop
) == NON_LVALUE_EXPR
)
4853 /* Unwrap the expression for C++ 98. */
4854 cop
= TREE_OPERAND (cop
, 0);
4856 if (TREE_CODE (cop
) == PTRMEM_CST
)
4858 /* The address of a nonstatic data member is never null. */
4859 warning_at (location
, OPT_Waddress
,
4860 "the address %qE will never be NULL",
4865 if (TREE_CODE (cop
) == NOP_EXPR
)
4867 /* Allow casts to intptr_t to suppress the warning. */
4868 tree type
= TREE_TYPE (cop
);
4869 if (TREE_CODE (type
) == INTEGER_TYPE
)
4875 bool warned
= false;
4876 if (TREE_CODE (cop
) == ADDR_EXPR
)
4878 cop
= TREE_OPERAND (cop
, 0);
4880 /* Set to true in the loop below if OP dereferences its operand.
4881 In such a case the ultimate target need not be a decl for
4882 the null [in]equality test to be necessarily constant. */
4885 /* Get the outermost array or object, or member. */
4886 while (handled_component_p (cop
))
4888 if (TREE_CODE (cop
) == COMPONENT_REF
)
4890 /* Get the member (its address is never null). */
4891 cop
= TREE_OPERAND (cop
, 1);
4895 /* Get the outer array/object to refer to in the warning. */
4896 cop
= TREE_OPERAND (cop
, 0);
4900 if ((!deref
&& !decl_with_nonnull_addr_p (cop
))
4901 || from_macro_expansion_at (location
)
4902 || warning_suppressed_p (cop
, OPT_Waddress
))
4905 warned
= warning_at (location
, OPT_Waddress
,
4906 "the address of %qD will never be NULL", cop
);
4909 else if (TREE_CODE (cop
) == POINTER_PLUS_EXPR
)
4911 /* Adding zero to the null pointer is well-defined in C++. When
4912 the offset is unknown (i.e., not a constant) warn anyway since
4913 it's less likely that the pointer operand is null than not. */
4914 tree off
= TREE_OPERAND (cop
, 1);
4915 if (!integer_zerop (off
)
4916 && !warning_suppressed_p (cop
, OPT_Waddress
))
4918 tree base
= TREE_OPERAND (cop
, 0);
4920 if (TYPE_REF_P (TREE_TYPE (base
)))
4921 warning_at (location
, OPT_Waddress
, "the compiler can assume that "
4922 "the address of %qE will never be NULL", base
);
4924 warning_at (location
, OPT_Waddress
, "comparing the result of "
4925 "pointer addition %qE and NULL", cop
);
4929 else if (CONVERT_EXPR_P (op
)
4930 && TYPE_REF_P (TREE_TYPE (TREE_OPERAND (op
, 0))))
4934 if (TREE_CODE (op
) == COMPONENT_REF
)
4935 op
= TREE_OPERAND (op
, 1);
4938 warned
= warning_at (location
, OPT_Waddress
,
4939 "the compiler can assume that the address of "
4940 "%qD will never be NULL", op
);
4943 if (warned
&& DECL_P (op
))
4944 inform (DECL_SOURCE_LOCATION (op
), "%qD declared here", op
);
4947 /* Warn about [expr.arith.conv]/2: If one operand is of enumeration type and
4948 the other operand is of a different enumeration type or a floating-point
4949 type, this behavior is deprecated ([depr.arith.conv.enum]). CODE is the
4950 code of the binary operation, TYPE0 and TYPE1 are the types of the operands,
4951 and LOC is the location for the whole binary expression.
4952 TODO: Consider combining this with -Wenum-compare in build_new_op_1. */
4955 do_warn_enum_conversions (location_t loc
, enum tree_code code
, tree type0
,
4958 if (TREE_CODE (type0
) == ENUMERAL_TYPE
4959 && TREE_CODE (type1
) == ENUMERAL_TYPE
4960 && TYPE_MAIN_VARIANT (type0
) != TYPE_MAIN_VARIANT (type1
))
4962 /* In C++20, -Wdeprecated-enum-enum-conversion is on by default.
4963 Otherwise, warn if -Wenum-conversion is on. */
4965 if (warn_deprecated_enum_enum_conv
)
4966 opt
= OPT_Wdeprecated_enum_enum_conversion
;
4967 else if (warn_enum_conversion
)
4968 opt
= OPT_Wenum_conversion
;
4980 /* Comparisons are handled by -Wenum-compare. */
4982 case SPACESHIP_EXPR
:
4983 /* This is invalid, don't warn. */
4988 warning_at (loc
, opt
, "bitwise operation between different "
4989 "enumeration types %qT and %qT is deprecated",
4993 warning_at (loc
, opt
, "arithmetic between different enumeration "
4994 "types %qT and %qT is deprecated", type0
, type1
);
4998 else if ((TREE_CODE (type0
) == ENUMERAL_TYPE
4999 && SCALAR_FLOAT_TYPE_P (type1
))
5000 || (SCALAR_FLOAT_TYPE_P (type0
)
5001 && TREE_CODE (type1
) == ENUMERAL_TYPE
))
5003 const bool enum_first_p
= TREE_CODE (type0
) == ENUMERAL_TYPE
;
5004 /* In C++20, -Wdeprecated-enum-float-conversion is on by default.
5005 Otherwise, warn if -Wenum-conversion is on. */
5007 if (warn_deprecated_enum_float_conv
)
5008 opt
= OPT_Wdeprecated_enum_float_conversion
;
5009 else if (warn_enum_conversion
)
5010 opt
= OPT_Wenum_conversion
;
5023 warning_at (loc
, opt
, "comparison of enumeration type %qT with "
5024 "floating-point type %qT is deprecated",
5027 warning_at (loc
, opt
, "comparison of floating-point type %qT "
5028 "with enumeration type %qT is deprecated",
5031 case SPACESHIP_EXPR
:
5032 /* This is invalid, don't warn. */
5036 warning_at (loc
, opt
, "arithmetic between enumeration type %qT "
5037 "and floating-point type %qT is deprecated",
5040 warning_at (loc
, opt
, "arithmetic between floating-point type %qT "
5041 "and enumeration type %qT is deprecated",
5048 /* Build a binary-operation expression without default conversions.
5049 CODE is the kind of expression to build.
5050 LOCATION is the location_t of the operator in the source code.
5051 This function differs from `build' in several ways:
5052 the data type of the result is computed and recorded in it,
5053 warnings are generated if arg data types are invalid,
5054 special handling for addition and subtraction of pointers is known,
5055 and some optimization is done (operations on narrow ints
5056 are done in the narrower type when that gives the same result).
5057 Constant folding is also done before the result is returned.
5059 Note that the operands will never have enumeral types
5060 because either they have just had the default conversions performed
5061 or they have both just been converted to some other type in which
5062 the arithmetic is to be done.
5064 C++: must do special pointer arithmetic when implementing
5065 multiple inheritance, and deal with pointer to member functions. */
5068 cp_build_binary_op (const op_location_t
&location
,
5069 enum tree_code code
, tree orig_op0
, tree orig_op1
,
5070 tsubst_flags_t complain
)
5073 enum tree_code code0
, code1
;
5074 tree type0
, type1
, orig_type0
, orig_type1
;
5075 const char *invalid_op_diag
;
5077 /* Expression code to give to the expression when it is built.
5078 Normally this is CODE, which is what the caller asked for,
5079 but in some special cases we change it. */
5080 enum tree_code resultcode
= code
;
5082 /* Data type in which the computation is to be performed.
5083 In the simplest cases this is the common type of the arguments. */
5084 tree result_type
= NULL_TREE
;
5086 /* When the computation is in excess precision, the type of the
5087 final EXCESS_PRECISION_EXPR. */
5088 tree semantic_result_type
= NULL
;
5090 /* Nonzero means operands have already been type-converted
5091 in whatever way is necessary.
5092 Zero means they need to be converted to RESULT_TYPE. */
5095 /* Nonzero means create the expression with this type, rather than
5097 tree build_type
= 0;
5099 /* Nonzero means after finally constructing the expression
5100 convert it to this type. */
5101 tree final_type
= 0;
5105 /* Nonzero if this is an operation like MIN or MAX which can
5106 safely be computed in short if both args are promoted shorts.
5107 Also implies COMMON.
5108 -1 indicates a bitwise operation; this makes a difference
5109 in the exact conditions for when it is safe to do the operation
5110 in a narrower mode. */
5113 /* Nonzero if this is a comparison operation;
5114 if both args are promoted shorts, compare the original shorts.
5115 Also implies COMMON. */
5116 int short_compare
= 0;
5118 /* Nonzero if this is a right-shift operation, which can be computed on the
5119 original short and then promoted if the operand is a promoted short. */
5120 int short_shift
= 0;
5122 /* Nonzero means set RESULT_TYPE to the common type of the args. */
5125 /* True if both operands have arithmetic type. */
5126 bool arithmetic_types_p
;
5128 /* Remember whether we're doing / or %. */
5129 bool doing_div_or_mod
= false;
5131 /* Remember whether we're doing << or >>. */
5132 bool doing_shift
= false;
5134 /* Tree holding instrumentation expression. */
5135 tree instrument_expr
= NULL_TREE
;
5137 /* True means this is an arithmetic operation that may need excess
5139 bool may_need_excess_precision
;
5141 /* Apply default conversions. */
5142 op0
= resolve_nondeduced_context (orig_op0
, complain
);
5143 op1
= resolve_nondeduced_context (orig_op1
, complain
);
5145 if (code
== TRUTH_AND_EXPR
|| code
== TRUTH_ANDIF_EXPR
5146 || code
== TRUTH_OR_EXPR
|| code
== TRUTH_ORIF_EXPR
5147 || code
== TRUTH_XOR_EXPR
)
5149 if (!really_overloaded_fn (op0
) && !VOID_TYPE_P (TREE_TYPE (op0
)))
5150 op0
= decay_conversion (op0
, complain
);
5151 if (!really_overloaded_fn (op1
) && !VOID_TYPE_P (TREE_TYPE (op1
)))
5152 op1
= decay_conversion (op1
, complain
);
5156 if (!really_overloaded_fn (op0
) && !VOID_TYPE_P (TREE_TYPE (op0
)))
5157 op0
= cp_default_conversion (op0
, complain
);
5158 if (!really_overloaded_fn (op1
) && !VOID_TYPE_P (TREE_TYPE (op1
)))
5159 op1
= cp_default_conversion (op1
, complain
);
5162 /* Strip NON_LVALUE_EXPRs, etc., since we aren't using as an lvalue. */
5163 STRIP_TYPE_NOPS (op0
);
5164 STRIP_TYPE_NOPS (op1
);
5166 /* DTRT if one side is an overloaded function, but complain about it. */
5167 if (type_unknown_p (op0
))
5169 tree t
= instantiate_type (TREE_TYPE (op1
), op0
, tf_none
);
5170 if (t
!= error_mark_node
)
5172 if (complain
& tf_error
)
5173 permerror (location
,
5174 "assuming cast to type %qT from overloaded function",
5179 if (type_unknown_p (op1
))
5181 tree t
= instantiate_type (TREE_TYPE (op0
), op1
, tf_none
);
5182 if (t
!= error_mark_node
)
5184 if (complain
& tf_error
)
5185 permerror (location
,
5186 "assuming cast to type %qT from overloaded function",
5192 orig_type0
= type0
= TREE_TYPE (op0
);
5193 orig_type1
= type1
= TREE_TYPE (op1
);
5194 tree non_ep_op0
= op0
;
5195 tree non_ep_op1
= op1
;
5197 /* The expression codes of the data types of the arguments tell us
5198 whether the arguments are integers, floating, pointers, etc. */
5199 code0
= TREE_CODE (type0
);
5200 code1
= TREE_CODE (type1
);
5202 /* If an error was already reported for one of the arguments,
5203 avoid reporting another error. */
5204 if (code0
== ERROR_MARK
|| code1
== ERROR_MARK
)
5205 return error_mark_node
;
5207 if ((invalid_op_diag
5208 = targetm
.invalid_binary_op (code
, type0
, type1
)))
5210 if (complain
& tf_error
)
5212 if (code0
== REAL_TYPE
5213 && code1
== REAL_TYPE
5214 && (extended_float_type_p (type0
)
5215 || extended_float_type_p (type1
))
5216 && cp_compare_floating_point_conversion_ranks (type0
,
5219 rich_location
richloc (line_table
, location
);
5220 binary_op_error (&richloc
, code
, type0
, type1
);
5223 error (invalid_op_diag
);
5225 return error_mark_node
;
5233 case TRUNC_DIV_EXPR
:
5235 case FLOOR_DIV_EXPR
:
5236 case ROUND_DIV_EXPR
:
5237 case EXACT_DIV_EXPR
:
5238 may_need_excess_precision
= true;
5246 case SPACESHIP_EXPR
:
5247 /* Excess precision for implicit conversions of integers to
5249 may_need_excess_precision
= (ANY_INTEGRAL_TYPE_P (type0
)
5250 || ANY_INTEGRAL_TYPE_P (type1
));
5253 may_need_excess_precision
= false;
5256 if (TREE_CODE (op0
) == EXCESS_PRECISION_EXPR
)
5258 op0
= TREE_OPERAND (op0
, 0);
5259 type0
= TREE_TYPE (op0
);
5261 else if (may_need_excess_precision
5262 && (code0
== REAL_TYPE
|| code0
== COMPLEX_TYPE
))
5263 if (tree eptype
= excess_precision_type (type0
))
5266 op0
= convert (eptype
, op0
);
5268 if (TREE_CODE (op1
) == EXCESS_PRECISION_EXPR
)
5270 op1
= TREE_OPERAND (op1
, 0);
5271 type1
= TREE_TYPE (op1
);
5273 else if (may_need_excess_precision
5274 && (code1
== REAL_TYPE
|| code1
== COMPLEX_TYPE
))
5275 if (tree eptype
= excess_precision_type (type1
))
5278 op1
= convert (eptype
, op1
);
5281 /* Issue warnings about peculiar, but valid, uses of NULL. */
5282 if ((null_node_p (orig_op0
) || null_node_p (orig_op1
))
5283 /* It's reasonable to use pointer values as operands of &&
5284 and ||, so NULL is no exception. */
5285 && code
!= TRUTH_ANDIF_EXPR
&& code
!= TRUTH_ORIF_EXPR
5286 && ( /* Both are NULL (or 0) and the operation was not a
5287 comparison or a pointer subtraction. */
5288 (null_ptr_cst_p (orig_op0
) && null_ptr_cst_p (orig_op1
)
5289 && code
!= EQ_EXPR
&& code
!= NE_EXPR
&& code
!= MINUS_EXPR
)
5290 /* Or if one of OP0 or OP1 is neither a pointer nor NULL. */
5291 || (!null_ptr_cst_p (orig_op0
)
5292 && !TYPE_PTR_OR_PTRMEM_P (type0
))
5293 || (!null_ptr_cst_p (orig_op1
)
5294 && !TYPE_PTR_OR_PTRMEM_P (type1
)))
5295 && (complain
& tf_warning
))
5298 expansion_point_location_if_in_system_header (input_location
);
5300 warning_at (loc
, OPT_Wpointer_arith
, "NULL used in arithmetic");
5303 /* In case when one of the operands of the binary operation is
5304 a vector and another is a scalar -- convert scalar to vector. */
5305 if ((gnu_vector_type_p (type0
) && code1
!= VECTOR_TYPE
)
5306 || (gnu_vector_type_p (type1
) && code0
!= VECTOR_TYPE
))
5308 enum stv_conv convert_flag
5309 = scalar_to_vector (location
, code
, non_ep_op0
, non_ep_op1
,
5310 complain
& tf_error
);
5312 switch (convert_flag
)
5315 return error_mark_node
;
5318 op0
= convert (TREE_TYPE (type1
), op0
);
5319 op0
= save_expr (op0
);
5320 op0
= build_vector_from_val (type1
, op0
);
5321 orig_type0
= type0
= TREE_TYPE (op0
);
5322 code0
= TREE_CODE (type0
);
5328 op1
= convert (TREE_TYPE (type0
), op1
);
5329 op1
= save_expr (op1
);
5330 op1
= build_vector_from_val (type0
, op1
);
5331 orig_type1
= type1
= TREE_TYPE (op1
);
5332 code1
= TREE_CODE (type1
);
5344 /* Subtraction of two similar pointers.
5345 We must subtract them as integers, then divide by object size. */
5346 if (code0
== POINTER_TYPE
&& code1
== POINTER_TYPE
5347 && same_type_ignoring_top_level_qualifiers_p (TREE_TYPE (type0
),
5350 result
= pointer_diff (location
, op0
, op1
,
5351 common_pointer_type (type0
, type1
), complain
,
5353 if (instrument_expr
!= NULL
)
5354 result
= build2 (COMPOUND_EXPR
, TREE_TYPE (result
),
5355 instrument_expr
, result
);
5359 /* In all other cases except pointer - int, the usual arithmetic
5361 else if (!(code0
== POINTER_TYPE
&& code1
== INTEGER_TYPE
))
5366 /* The pointer - int case is just like pointer + int; fall
5370 if ((code0
== POINTER_TYPE
|| code1
== POINTER_TYPE
)
5371 && (code0
== INTEGER_TYPE
|| code1
== INTEGER_TYPE
))
5375 ptr_operand
= ((code0
== POINTER_TYPE
) ? op0
: op1
);
5376 int_operand
= ((code0
== INTEGER_TYPE
) ? op0
: op1
);
5377 if (processing_template_decl
)
5379 result_type
= TREE_TYPE (ptr_operand
);
5382 return cp_pointer_int_sum (location
, code
,
5394 case TRUNC_DIV_EXPR
:
5396 case FLOOR_DIV_EXPR
:
5397 case ROUND_DIV_EXPR
:
5398 case EXACT_DIV_EXPR
:
5399 if (TREE_CODE (op0
) == SIZEOF_EXPR
&& TREE_CODE (op1
) == SIZEOF_EXPR
)
5401 tree type0
= TREE_OPERAND (op0
, 0);
5402 tree type1
= TREE_OPERAND (op1
, 0);
5403 tree first_arg
= tree_strip_any_location_wrapper (type0
);
5404 if (!TYPE_P (type0
))
5405 type0
= TREE_TYPE (type0
);
5406 if (!TYPE_P (type1
))
5407 type1
= TREE_TYPE (type1
);
5408 if (INDIRECT_TYPE_P (type0
) && same_type_p (TREE_TYPE (type0
), type1
))
5410 if (!(TREE_CODE (first_arg
) == PARM_DECL
5411 && DECL_ARRAY_PARAMETER_P (first_arg
)
5412 && warn_sizeof_array_argument
)
5413 && (complain
& tf_warning
))
5415 auto_diagnostic_group d
;
5416 if (warning_at (location
, OPT_Wsizeof_pointer_div
,
5417 "division %<sizeof (%T) / sizeof (%T)%> does "
5418 "not compute the number of array elements",
5420 if (DECL_P (first_arg
))
5421 inform (DECL_SOURCE_LOCATION (first_arg
),
5422 "first %<sizeof%> operand was declared here");
5425 else if (TREE_CODE (type0
) == ARRAY_TYPE
5426 && !char_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (type0
)))
5427 /* Set by finish_parenthesized_expr. */
5428 && !warning_suppressed_p (op1
, OPT_Wsizeof_array_div
)
5429 && (complain
& tf_warning
))
5430 maybe_warn_sizeof_array_div (location
, first_arg
, type0
,
5431 op1
, non_reference (type1
));
5434 if ((code0
== INTEGER_TYPE
|| code0
== REAL_TYPE
5435 || code0
== COMPLEX_TYPE
|| code0
== VECTOR_TYPE
)
5436 && (code1
== INTEGER_TYPE
|| code1
== REAL_TYPE
5437 || code1
== COMPLEX_TYPE
|| code1
== VECTOR_TYPE
))
5439 enum tree_code tcode0
= code0
, tcode1
= code1
;
5440 doing_div_or_mod
= true;
5441 warn_for_div_by_zero (location
, fold_for_warn (op1
));
5443 if (tcode0
== COMPLEX_TYPE
|| tcode0
== VECTOR_TYPE
)
5444 tcode0
= TREE_CODE (TREE_TYPE (TREE_TYPE (op0
)));
5445 if (tcode1
== COMPLEX_TYPE
|| tcode1
== VECTOR_TYPE
)
5446 tcode1
= TREE_CODE (TREE_TYPE (TREE_TYPE (op1
)));
5448 if (!(tcode0
== INTEGER_TYPE
&& tcode1
== INTEGER_TYPE
))
5449 resultcode
= RDIV_EXPR
;
5452 /* When dividing two signed integers, we have to promote to int.
5453 unless we divide by a constant != -1. Note that default
5454 conversion will have been performed on the operands at this
5455 point, so we have to dig out the original type to find out if
5457 tree stripped_op1
= tree_strip_any_location_wrapper (op1
);
5458 shorten
= may_shorten_divmod (op0
, stripped_op1
);
5468 if ((code0
== INTEGER_TYPE
&& code1
== INTEGER_TYPE
)
5469 || (code0
== VECTOR_TYPE
&& code1
== VECTOR_TYPE
5470 && !VECTOR_FLOAT_TYPE_P (type0
)
5471 && !VECTOR_FLOAT_TYPE_P (type1
)))
5475 case TRUNC_MOD_EXPR
:
5476 case FLOOR_MOD_EXPR
:
5477 doing_div_or_mod
= true;
5478 warn_for_div_by_zero (location
, fold_for_warn (op1
));
5480 if (code0
== VECTOR_TYPE
&& code1
== VECTOR_TYPE
5481 && TREE_CODE (TREE_TYPE (type0
)) == INTEGER_TYPE
5482 && TREE_CODE (TREE_TYPE (type1
)) == INTEGER_TYPE
)
5484 else if (code0
== INTEGER_TYPE
&& code1
== INTEGER_TYPE
)
5486 /* Although it would be tempting to shorten always here, that loses
5487 on some targets, since the modulo instruction is undefined if the
5488 quotient can't be represented in the computation mode. We shorten
5489 only if unsigned or if dividing by something we know != -1. */
5490 tree stripped_op1
= tree_strip_any_location_wrapper (op1
);
5491 shorten
= may_shorten_divmod (op0
, stripped_op1
);
5496 case TRUTH_ANDIF_EXPR
:
5497 case TRUTH_ORIF_EXPR
:
5498 case TRUTH_AND_EXPR
:
5500 if (!VECTOR_TYPE_P (type0
) && gnu_vector_type_p (type1
))
5502 if (!COMPARISON_CLASS_P (op1
))
5503 op1
= cp_build_binary_op (EXPR_LOCATION (op1
), NE_EXPR
, op1
,
5504 build_zero_cst (type1
), complain
);
5505 if (code
== TRUTH_ANDIF_EXPR
)
5507 tree z
= build_zero_cst (TREE_TYPE (op1
));
5508 return build_conditional_expr (location
, op0
, op1
, z
, complain
);
5510 else if (code
== TRUTH_ORIF_EXPR
)
5512 tree m1
= build_all_ones_cst (TREE_TYPE (op1
));
5513 return build_conditional_expr (location
, op0
, m1
, op1
, complain
);
5518 if (gnu_vector_type_p (type0
)
5519 && (!VECTOR_TYPE_P (type1
) || gnu_vector_type_p (type1
)))
5521 if (!COMPARISON_CLASS_P (op0
))
5522 op0
= cp_build_binary_op (EXPR_LOCATION (op0
), NE_EXPR
, op0
,
5523 build_zero_cst (type0
), complain
);
5524 if (!VECTOR_TYPE_P (type1
))
5526 tree m1
= build_all_ones_cst (TREE_TYPE (op0
));
5527 tree z
= build_zero_cst (TREE_TYPE (op0
));
5528 op1
= build_conditional_expr (location
, op1
, m1
, z
, complain
);
5530 else if (!COMPARISON_CLASS_P (op1
))
5531 op1
= cp_build_binary_op (EXPR_LOCATION (op1
), NE_EXPR
, op1
,
5532 build_zero_cst (type1
), complain
);
5534 if (code
== TRUTH_ANDIF_EXPR
)
5535 code
= BIT_AND_EXPR
;
5536 else if (code
== TRUTH_ORIF_EXPR
)
5537 code
= BIT_IOR_EXPR
;
5541 return cp_build_binary_op (location
, code
, op0
, op1
, complain
);
5544 result_type
= boolean_type_node
;
5547 /* Shift operations: result has same type as first operand;
5548 always convert second operand to int.
5549 Also set SHORT_SHIFT if shifting rightward. */
5552 if (gnu_vector_type_p (type0
)
5553 && code1
== INTEGER_TYPE
5554 && TREE_CODE (TREE_TYPE (type0
)) == INTEGER_TYPE
)
5556 result_type
= type0
;
5559 else if (gnu_vector_type_p (type0
)
5560 && gnu_vector_type_p (type1
)
5561 && TREE_CODE (TREE_TYPE (type0
)) == INTEGER_TYPE
5562 && TREE_CODE (TREE_TYPE (type1
)) == INTEGER_TYPE
5563 && known_eq (TYPE_VECTOR_SUBPARTS (type0
),
5564 TYPE_VECTOR_SUBPARTS (type1
)))
5566 result_type
= type0
;
5569 else if (code0
== INTEGER_TYPE
&& code1
== INTEGER_TYPE
)
5571 tree const_op1
= fold_for_warn (op1
);
5572 if (TREE_CODE (const_op1
) != INTEGER_CST
)
5574 result_type
= type0
;
5576 if (TREE_CODE (const_op1
) == INTEGER_CST
)
5578 if (tree_int_cst_lt (const_op1
, integer_zero_node
))
5580 if ((complain
& tf_warning
)
5581 && c_inhibit_evaluation_warnings
== 0)
5582 warning_at (location
, OPT_Wshift_count_negative
,
5583 "right shift count is negative");
5587 if (!integer_zerop (const_op1
))
5590 if (compare_tree_int (const_op1
, TYPE_PRECISION (type0
)) >= 0
5591 && (complain
& tf_warning
)
5592 && c_inhibit_evaluation_warnings
== 0)
5593 warning_at (location
, OPT_Wshift_count_overflow
,
5594 "right shift count >= width of type");
5597 /* Avoid converting op1 to result_type later. */
5603 if (gnu_vector_type_p (type0
)
5604 && code1
== INTEGER_TYPE
5605 && TREE_CODE (TREE_TYPE (type0
)) == INTEGER_TYPE
)
5607 result_type
= type0
;
5610 else if (gnu_vector_type_p (type0
)
5611 && gnu_vector_type_p (type1
)
5612 && TREE_CODE (TREE_TYPE (type0
)) == INTEGER_TYPE
5613 && TREE_CODE (TREE_TYPE (type1
)) == INTEGER_TYPE
5614 && known_eq (TYPE_VECTOR_SUBPARTS (type0
),
5615 TYPE_VECTOR_SUBPARTS (type1
)))
5617 result_type
= type0
;
5620 else if (code0
== INTEGER_TYPE
&& code1
== INTEGER_TYPE
)
5622 tree const_op0
= fold_for_warn (op0
);
5623 if (TREE_CODE (const_op0
) != INTEGER_CST
)
5625 tree const_op1
= fold_for_warn (op1
);
5626 if (TREE_CODE (const_op1
) != INTEGER_CST
)
5628 result_type
= type0
;
5630 if (TREE_CODE (const_op0
) == INTEGER_CST
5631 && tree_int_cst_sgn (const_op0
) < 0
5632 && !TYPE_OVERFLOW_WRAPS (type0
)
5633 && (complain
& tf_warning
)
5634 && c_inhibit_evaluation_warnings
== 0)
5635 warning_at (location
, OPT_Wshift_negative_value
,
5636 "left shift of negative value");
5637 if (TREE_CODE (const_op1
) == INTEGER_CST
)
5639 if (tree_int_cst_lt (const_op1
, integer_zero_node
))
5641 if ((complain
& tf_warning
)
5642 && c_inhibit_evaluation_warnings
== 0)
5643 warning_at (location
, OPT_Wshift_count_negative
,
5644 "left shift count is negative");
5646 else if (compare_tree_int (const_op1
,
5647 TYPE_PRECISION (type0
)) >= 0)
5649 if ((complain
& tf_warning
)
5650 && c_inhibit_evaluation_warnings
== 0)
5651 warning_at (location
, OPT_Wshift_count_overflow
,
5652 "left shift count >= width of type");
5654 else if (TREE_CODE (const_op0
) == INTEGER_CST
5655 && (complain
& tf_warning
))
5656 maybe_warn_shift_overflow (location
, const_op0
, const_op1
);
5658 /* Avoid converting op1 to result_type later. */
5665 if (gnu_vector_type_p (type0
) && gnu_vector_type_p (type1
))
5666 goto vector_compare
;
5667 if ((complain
& tf_warning
)
5668 && c_inhibit_evaluation_warnings
== 0
5669 && (FLOAT_TYPE_P (type0
) || FLOAT_TYPE_P (type1
)))
5670 warning_at (location
, OPT_Wfloat_equal
,
5671 "comparing floating-point with %<==%> "
5672 "or %<!=%> is unsafe");
5673 if (complain
& tf_warning
)
5675 tree stripped_orig_op0
= tree_strip_any_location_wrapper (orig_op0
);
5676 tree stripped_orig_op1
= tree_strip_any_location_wrapper (orig_op1
);
5677 if ((TREE_CODE (stripped_orig_op0
) == STRING_CST
5678 && !integer_zerop (cp_fully_fold (op1
)))
5679 || (TREE_CODE (stripped_orig_op1
) == STRING_CST
5680 && !integer_zerop (cp_fully_fold (op0
))))
5681 warning_at (location
, OPT_Waddress
,
5682 "comparison with string literal results in "
5683 "unspecified behavior");
5684 else if (warn_array_compare
5685 && TREE_CODE (TREE_TYPE (orig_op0
)) == ARRAY_TYPE
5686 && TREE_CODE (TREE_TYPE (orig_op1
)) == ARRAY_TYPE
)
5687 do_warn_array_compare (location
, code
, stripped_orig_op0
,
5691 build_type
= boolean_type_node
;
5692 if ((code0
== INTEGER_TYPE
|| code0
== REAL_TYPE
5693 || code0
== COMPLEX_TYPE
|| code0
== ENUMERAL_TYPE
)
5694 && (code1
== INTEGER_TYPE
|| code1
== REAL_TYPE
5695 || code1
== COMPLEX_TYPE
|| code1
== ENUMERAL_TYPE
))
5697 else if (((code0
== POINTER_TYPE
|| TYPE_PTRDATAMEM_P (type0
))
5698 && null_ptr_cst_p (orig_op1
))
5699 /* Handle, eg, (void*)0 (c++/43906), and more. */
5700 || (code0
== POINTER_TYPE
5701 && TYPE_PTR_P (type1
) && integer_zerop (op1
)))
5703 if (TYPE_PTR_P (type1
))
5704 result_type
= composite_pointer_type (location
,
5705 type0
, type1
, op0
, op1
,
5706 CPO_COMPARISON
, complain
);
5708 result_type
= type0
;
5710 if (char_type_p (TREE_TYPE (orig_op1
)))
5712 auto_diagnostic_group d
;
5713 if (warning_at (location
, OPT_Wpointer_compare
,
5714 "comparison between pointer and zero character "
5717 "did you mean to dereference the pointer?");
5719 warn_for_null_address (location
, op0
, complain
);
5721 else if (((code1
== POINTER_TYPE
|| TYPE_PTRDATAMEM_P (type1
))
5722 && null_ptr_cst_p (orig_op0
))
5723 /* Handle, eg, (void*)0 (c++/43906), and more. */
5724 || (code1
== POINTER_TYPE
5725 && TYPE_PTR_P (type0
) && integer_zerop (op0
)))
5727 if (TYPE_PTR_P (type0
))
5728 result_type
= composite_pointer_type (location
,
5729 type0
, type1
, op0
, op1
,
5730 CPO_COMPARISON
, complain
);
5732 result_type
= type1
;
5734 if (char_type_p (TREE_TYPE (orig_op0
)))
5736 auto_diagnostic_group d
;
5737 if (warning_at (location
, OPT_Wpointer_compare
,
5738 "comparison between pointer and zero character "
5741 "did you mean to dereference the pointer?");
5743 warn_for_null_address (location
, op1
, complain
);
5745 else if ((code0
== POINTER_TYPE
&& code1
== POINTER_TYPE
)
5746 || (TYPE_PTRDATAMEM_P (type0
) && TYPE_PTRDATAMEM_P (type1
)))
5747 result_type
= composite_pointer_type (location
,
5748 type0
, type1
, op0
, op1
,
5749 CPO_COMPARISON
, complain
);
5750 else if (null_ptr_cst_p (orig_op0
) && null_ptr_cst_p (orig_op1
))
5751 /* One of the operands must be of nullptr_t type. */
5752 result_type
= TREE_TYPE (nullptr_node
);
5753 else if (code0
== POINTER_TYPE
&& code1
== INTEGER_TYPE
)
5755 result_type
= type0
;
5756 if (complain
& tf_error
)
5757 permerror (location
, "ISO C++ forbids comparison between "
5758 "pointer and integer");
5760 return error_mark_node
;
5762 else if (code0
== INTEGER_TYPE
&& code1
== POINTER_TYPE
)
5764 result_type
= type1
;
5765 if (complain
& tf_error
)
5766 permerror (location
, "ISO C++ forbids comparison between "
5767 "pointer and integer");
5769 return error_mark_node
;
5771 else if (TYPE_PTRMEMFUNC_P (type0
) && null_ptr_cst_p (orig_op1
))
5773 if (TARGET_PTRMEMFUNC_VBIT_LOCATION
5774 == ptrmemfunc_vbit_in_delta
)
5776 tree pfn0
, delta0
, e1
, e2
;
5778 if (TREE_SIDE_EFFECTS (op0
))
5779 op0
= cp_save_expr (op0
);
5781 pfn0
= pfn_from_ptrmemfunc (op0
);
5782 delta0
= delta_from_ptrmemfunc (op0
);
5784 /* If we will warn below about a null-address compare
5785 involving the orig_op0 ptrmemfunc, we'd likely also
5786 warn about the pfn0's null-address compare, and
5787 that would be redundant, so suppress it. */
5788 warning_sentinel
ws (warn_address
);
5789 e1
= cp_build_binary_op (location
,
5792 build_zero_cst (TREE_TYPE (pfn0
)),
5795 e2
= cp_build_binary_op (location
,
5801 if (complain
& tf_warning
)
5802 maybe_warn_zero_as_null_pointer_constant (op1
, input_location
);
5804 e2
= cp_build_binary_op (location
,
5805 EQ_EXPR
, e2
, integer_zero_node
,
5807 op0
= cp_build_binary_op (location
,
5808 TRUTH_ANDIF_EXPR
, e1
, e2
,
5810 op1
= cp_convert (TREE_TYPE (op0
), integer_one_node
, complain
);
5814 op0
= build_ptrmemfunc_access_expr (op0
, pfn_identifier
);
5815 op1
= cp_convert (TREE_TYPE (op0
), op1
, complain
);
5817 result_type
= TREE_TYPE (op0
);
5819 warn_for_null_address (location
, orig_op0
, complain
);
5821 else if (TYPE_PTRMEMFUNC_P (type1
) && null_ptr_cst_p (orig_op0
))
5822 return cp_build_binary_op (location
, code
, op1
, op0
, complain
);
5823 else if (TYPE_PTRMEMFUNC_P (type0
) && TYPE_PTRMEMFUNC_P (type1
))
5826 /* E will be the final comparison. */
5828 /* E1 and E2 are for scratch. */
5836 type
= composite_pointer_type (location
, type0
, type1
, op0
, op1
,
5837 CPO_COMPARISON
, complain
);
5839 if (!same_type_p (TREE_TYPE (op0
), type
))
5840 op0
= cp_convert_and_check (type
, op0
, complain
);
5841 if (!same_type_p (TREE_TYPE (op1
), type
))
5842 op1
= cp_convert_and_check (type
, op1
, complain
);
5844 if (op0
== error_mark_node
|| op1
== error_mark_node
)
5845 return error_mark_node
;
5847 if (TREE_SIDE_EFFECTS (op0
))
5848 op0
= save_expr (op0
);
5849 if (TREE_SIDE_EFFECTS (op1
))
5850 op1
= save_expr (op1
);
5852 pfn0
= pfn_from_ptrmemfunc (op0
);
5853 pfn0
= cp_fully_fold (pfn0
);
5854 /* Avoid -Waddress warnings (c++/64877). */
5855 if (TREE_CODE (pfn0
) == ADDR_EXPR
)
5856 suppress_warning (pfn0
, OPT_Waddress
);
5857 pfn1
= pfn_from_ptrmemfunc (op1
);
5858 pfn1
= cp_fully_fold (pfn1
);
5859 delta0
= delta_from_ptrmemfunc (op0
);
5860 delta1
= delta_from_ptrmemfunc (op1
);
5861 if (TARGET_PTRMEMFUNC_VBIT_LOCATION
5862 == ptrmemfunc_vbit_in_delta
)
5867 && ((op0.delta == op1.delta)
5868 || (!op0.pfn && op0.delta & 1 == 0
5869 && op1.delta & 1 == 0))
5871 The reason for the `!op0.pfn' bit is that a NULL
5872 pointer-to-member is any member with a zero PFN and
5873 LSB of the DELTA field is 0. */
5875 e1
= cp_build_binary_op (location
, BIT_AND_EXPR
,
5879 e1
= cp_build_binary_op (location
,
5880 EQ_EXPR
, e1
, integer_zero_node
,
5882 e2
= cp_build_binary_op (location
, BIT_AND_EXPR
,
5886 e2
= cp_build_binary_op (location
,
5887 EQ_EXPR
, e2
, integer_zero_node
,
5889 e1
= cp_build_binary_op (location
,
5890 TRUTH_ANDIF_EXPR
, e2
, e1
,
5892 e2
= cp_build_binary_op (location
, EQ_EXPR
,
5894 build_zero_cst (TREE_TYPE (pfn0
)),
5896 e2
= cp_build_binary_op (location
,
5897 TRUTH_ANDIF_EXPR
, e2
, e1
, complain
);
5898 e1
= cp_build_binary_op (location
,
5899 EQ_EXPR
, delta0
, delta1
, complain
);
5900 e1
= cp_build_binary_op (location
,
5901 TRUTH_ORIF_EXPR
, e1
, e2
, complain
);
5908 && (!op0.pfn || op0.delta == op1.delta))
5910 The reason for the `!op0.pfn' bit is that a NULL
5911 pointer-to-member is any member with a zero PFN; the
5912 DELTA field is unspecified. */
5914 e1
= cp_build_binary_op (location
,
5915 EQ_EXPR
, delta0
, delta1
, complain
);
5916 e2
= cp_build_binary_op (location
,
5919 build_zero_cst (TREE_TYPE (pfn0
)),
5921 e1
= cp_build_binary_op (location
,
5922 TRUTH_ORIF_EXPR
, e1
, e2
, complain
);
5924 e2
= build2 (EQ_EXPR
, boolean_type_node
, pfn0
, pfn1
);
5925 e
= cp_build_binary_op (location
,
5926 TRUTH_ANDIF_EXPR
, e2
, e1
, complain
);
5927 if (code
== EQ_EXPR
)
5929 return cp_build_binary_op (location
,
5930 EQ_EXPR
, e
, integer_zero_node
, complain
);
5934 gcc_assert (!TYPE_PTRMEMFUNC_P (type0
)
5935 || !same_type_p (TYPE_PTRMEMFUNC_FN_TYPE (type0
),
5937 gcc_assert (!TYPE_PTRMEMFUNC_P (type1
)
5938 || !same_type_p (TYPE_PTRMEMFUNC_FN_TYPE (type1
),
5946 if ((code0
== INTEGER_TYPE
|| code0
== REAL_TYPE
)
5947 && (code1
== INTEGER_TYPE
|| code1
== REAL_TYPE
))
5949 else if (code0
== POINTER_TYPE
&& code1
== POINTER_TYPE
)
5950 result_type
= composite_pointer_type (location
,
5951 type0
, type1
, op0
, op1
,
5952 CPO_COMPARISON
, complain
);
5959 case SPACESHIP_EXPR
:
5960 if (TREE_CODE (orig_op0
) == STRING_CST
5961 || TREE_CODE (orig_op1
) == STRING_CST
)
5963 if (complain
& tf_warning
)
5964 warning_at (location
, OPT_Waddress
,
5965 "comparison with string literal results "
5966 "in unspecified behavior");
5968 else if (warn_array_compare
5969 && TREE_CODE (TREE_TYPE (orig_op0
)) == ARRAY_TYPE
5970 && TREE_CODE (TREE_TYPE (orig_op1
)) == ARRAY_TYPE
5971 && code
!= SPACESHIP_EXPR
5972 && (complain
& tf_warning
))
5973 do_warn_array_compare (location
, code
,
5974 tree_strip_any_location_wrapper (orig_op0
),
5975 tree_strip_any_location_wrapper (orig_op1
));
5977 if (gnu_vector_type_p (type0
) && gnu_vector_type_p (type1
))
5981 if (!same_type_ignoring_top_level_qualifiers_p (TREE_TYPE (type0
),
5983 && !vector_types_compatible_elements_p (type0
, type1
))
5985 if (complain
& tf_error
)
5987 error_at (location
, "comparing vectors with different "
5989 inform (location
, "operand types are %qT and %qT",
5992 return error_mark_node
;
5995 if (maybe_ne (TYPE_VECTOR_SUBPARTS (type0
),
5996 TYPE_VECTOR_SUBPARTS (type1
)))
5998 if (complain
& tf_error
)
6000 error_at (location
, "comparing vectors with different "
6001 "number of elements");
6002 inform (location
, "operand types are %qT and %qT",
6005 return error_mark_node
;
6008 /* It's not precisely specified how the usual arithmetic
6009 conversions apply to the vector types. Here, we use
6010 the unsigned type if one of the operands is signed and
6011 the other one is unsigned. */
6012 if (TYPE_UNSIGNED (type0
) != TYPE_UNSIGNED (type1
))
6014 if (!TYPE_UNSIGNED (type0
))
6015 op0
= build1 (VIEW_CONVERT_EXPR
, type1
, op0
);
6017 op1
= build1 (VIEW_CONVERT_EXPR
, type0
, op1
);
6018 warning_at (location
, OPT_Wsign_compare
, "comparison between "
6019 "types %qT and %qT", type0
, type1
);
6022 if (resultcode
== SPACESHIP_EXPR
)
6024 if (complain
& tf_error
)
6025 sorry_at (location
, "three-way comparison of vectors");
6026 return error_mark_node
;
6029 /* Always construct signed integer vector type. */
6030 intt
= c_common_type_for_size
6031 (GET_MODE_BITSIZE (SCALAR_TYPE_MODE (TREE_TYPE (type0
))), 0);
6034 if (complain
& tf_error
)
6035 error_at (location
, "could not find an integer type "
6036 "of the same size as %qT", TREE_TYPE (type0
));
6037 return error_mark_node
;
6039 result_type
= build_opaque_vector_type (intt
,
6040 TYPE_VECTOR_SUBPARTS (type0
));
6041 return build_vec_cmp (resultcode
, result_type
, op0
, op1
);
6043 build_type
= boolean_type_node
;
6044 if ((code0
== INTEGER_TYPE
|| code0
== REAL_TYPE
6045 || code0
== ENUMERAL_TYPE
)
6046 && (code1
== INTEGER_TYPE
|| code1
== REAL_TYPE
6047 || code1
== ENUMERAL_TYPE
))
6049 else if (code0
== POINTER_TYPE
&& code1
== POINTER_TYPE
)
6050 result_type
= composite_pointer_type (location
,
6051 type0
, type1
, op0
, op1
,
6052 CPO_COMPARISON
, complain
);
6053 else if ((code0
== POINTER_TYPE
&& null_ptr_cst_p (orig_op1
))
6054 || (code1
== POINTER_TYPE
&& null_ptr_cst_p (orig_op0
))
6055 || (null_ptr_cst_p (orig_op0
) && null_ptr_cst_p (orig_op1
)))
6057 /* Core Issue 1512 made this ill-formed. */
6058 if (complain
& tf_error
)
6059 error_at (location
, "ordered comparison of pointer with "
6060 "integer zero (%qT and %qT)", type0
, type1
);
6061 return error_mark_node
;
6063 else if (code0
== POINTER_TYPE
&& code1
== INTEGER_TYPE
)
6065 result_type
= type0
;
6066 if (complain
& tf_error
)
6067 permerror (location
, "ISO C++ forbids comparison between "
6068 "pointer and integer");
6070 return error_mark_node
;
6072 else if (code0
== INTEGER_TYPE
&& code1
== POINTER_TYPE
)
6074 result_type
= type1
;
6075 if (complain
& tf_error
)
6076 permerror (location
, "ISO C++ forbids comparison between "
6077 "pointer and integer");
6079 return error_mark_node
;
6082 if ((code0
== POINTER_TYPE
|| code1
== POINTER_TYPE
)
6083 && !processing_template_decl
6084 && sanitize_flags_p (SANITIZE_POINTER_COMPARE
))
6086 op0
= save_expr (op0
);
6087 op1
= save_expr (op1
);
6089 tree tt
= builtin_decl_explicit (BUILT_IN_ASAN_POINTER_COMPARE
);
6090 instrument_expr
= build_call_expr_loc (location
, tt
, 2, op0
, op1
);
6095 case UNORDERED_EXPR
:
6102 build_type
= integer_type_node
;
6103 if (code0
!= REAL_TYPE
|| code1
!= REAL_TYPE
)
6105 if (complain
& tf_error
)
6106 error ("unordered comparison on non-floating-point argument");
6107 return error_mark_node
;
6116 if (((code0
== INTEGER_TYPE
|| code0
== REAL_TYPE
|| code0
== COMPLEX_TYPE
6117 || code0
== ENUMERAL_TYPE
)
6118 && (code1
== INTEGER_TYPE
|| code1
== REAL_TYPE
6119 || code1
== COMPLEX_TYPE
|| code1
== ENUMERAL_TYPE
)))
6120 arithmetic_types_p
= 1;
6123 arithmetic_types_p
= 0;
6124 /* Vector arithmetic is only allowed when both sides are vectors. */
6125 if (gnu_vector_type_p (type0
) && gnu_vector_type_p (type1
))
6127 if (!tree_int_cst_equal (TYPE_SIZE (type0
), TYPE_SIZE (type1
))
6128 || !vector_types_compatible_elements_p (type0
, type1
))
6130 if (complain
& tf_error
)
6132 /* "location" already embeds the locations of the
6133 operands, so we don't need to add them separately
6135 rich_location
richloc (line_table
, location
);
6136 binary_op_error (&richloc
, code
, type0
, type1
);
6138 return error_mark_node
;
6140 arithmetic_types_p
= 1;
6143 /* Determine the RESULT_TYPE, if it is not already known. */
6145 && arithmetic_types_p
6146 && (shorten
|| common
|| short_compare
))
6148 result_type
= cp_common_type (type0
, type1
);
6149 if (result_type
== error_mark_node
)
6153 if (TREE_CODE (t1
) == COMPLEX_TYPE
)
6154 t1
= TREE_TYPE (t1
);
6155 if (TREE_CODE (t2
) == COMPLEX_TYPE
)
6156 t2
= TREE_TYPE (t2
);
6157 gcc_checking_assert (TREE_CODE (t1
) == REAL_TYPE
6158 && TREE_CODE (t2
) == REAL_TYPE
6159 && (extended_float_type_p (t1
)
6160 || extended_float_type_p (t2
))
6161 && cp_compare_floating_point_conversion_ranks
6163 if (complain
& tf_error
)
6165 rich_location
richloc (line_table
, location
);
6166 binary_op_error (&richloc
, code
, type0
, type1
);
6168 return error_mark_node
;
6170 if (complain
& tf_warning
)
6172 do_warn_double_promotion (result_type
, type0
, type1
,
6173 "implicit conversion from %qH to %qI "
6174 "to match other operand of binary "
6177 do_warn_enum_conversions (location
, code
, TREE_TYPE (orig_op0
),
6178 TREE_TYPE (orig_op1
));
6181 if (may_need_excess_precision
6182 && (orig_type0
!= type0
|| orig_type1
!= type1
)
6183 && build_type
== NULL_TREE
6186 gcc_assert (common
);
6187 semantic_result_type
= cp_common_type (orig_type0
, orig_type1
);
6188 if (semantic_result_type
== error_mark_node
)
6190 tree t1
= orig_type0
;
6191 tree t2
= orig_type1
;
6192 if (TREE_CODE (t1
) == COMPLEX_TYPE
)
6193 t1
= TREE_TYPE (t1
);
6194 if (TREE_CODE (t2
) == COMPLEX_TYPE
)
6195 t2
= TREE_TYPE (t2
);
6196 gcc_checking_assert (TREE_CODE (t1
) == REAL_TYPE
6197 && TREE_CODE (t2
) == REAL_TYPE
6198 && (extended_float_type_p (t1
)
6199 || extended_float_type_p (t2
))
6200 && cp_compare_floating_point_conversion_ranks
6202 if (complain
& tf_error
)
6204 rich_location
richloc (line_table
, location
);
6205 binary_op_error (&richloc
, code
, type0
, type1
);
6207 return error_mark_node
;
6211 if (code
== SPACESHIP_EXPR
)
6213 iloc_sentinel
s (location
);
6215 tree orig_type0
= TREE_TYPE (orig_op0
);
6216 tree_code orig_code0
= TREE_CODE (orig_type0
);
6217 tree orig_type1
= TREE_TYPE (orig_op1
);
6218 tree_code orig_code1
= TREE_CODE (orig_type1
);
6219 if (!result_type
|| result_type
== error_mark_node
)
6221 result_type
= NULL_TREE
;
6222 else if ((orig_code0
== BOOLEAN_TYPE
) != (orig_code1
== BOOLEAN_TYPE
))
6223 /* "If one of the operands is of type bool and the other is not, the
6224 program is ill-formed." */
6225 result_type
= NULL_TREE
;
6226 else if (code0
== POINTER_TYPE
&& orig_code0
!= POINTER_TYPE
6227 && code1
== POINTER_TYPE
&& orig_code1
!= POINTER_TYPE
)
6228 /* We only do array/function-to-pointer conversion if "at least one of
6229 the operands is of pointer type". */
6230 result_type
= NULL_TREE
;
6231 else if (TYPE_PTRFN_P (result_type
) || NULLPTR_TYPE_P (result_type
))
6232 /* <=> no longer supports equality relations. */
6233 result_type
= NULL_TREE
;
6234 else if (orig_code0
== ENUMERAL_TYPE
&& orig_code1
== ENUMERAL_TYPE
6235 && !(same_type_ignoring_top_level_qualifiers_p
6236 (orig_type0
, orig_type1
)))
6237 /* "If both operands have arithmetic types, or one operand has integral
6238 type and the other operand has unscoped enumeration type, the usual
6239 arithmetic conversions are applied to the operands." So we don't do
6240 arithmetic conversions if the operands both have enumeral type. */
6241 result_type
= NULL_TREE
;
6242 else if ((orig_code0
== ENUMERAL_TYPE
&& orig_code1
== REAL_TYPE
)
6243 || (orig_code0
== REAL_TYPE
&& orig_code1
== ENUMERAL_TYPE
))
6244 /* [depr.arith.conv.enum]: Three-way comparisons between such operands
6245 [where one is of enumeration type and the other is of a different
6246 enumeration type or a floating-point type] are ill-formed. */
6247 result_type
= NULL_TREE
;
6251 build_type
= spaceship_type (result_type
, complain
);
6252 if (build_type
== error_mark_node
)
6253 return error_mark_node
;
6256 if (result_type
&& arithmetic_types_p
)
6258 /* If a narrowing conversion is required, other than from an integral
6259 type to a floating point type, the program is ill-formed. */
6261 if (TREE_CODE (result_type
) == REAL_TYPE
6262 && CP_INTEGRAL_TYPE_P (orig_type0
))
6264 else if (!check_narrowing (result_type
, orig_op0
, complain
))
6266 if (TREE_CODE (result_type
) == REAL_TYPE
6267 && CP_INTEGRAL_TYPE_P (orig_type1
))
6269 else if (!check_narrowing (result_type
, orig_op1
, complain
))
6271 if (!ok
&& !(complain
& tf_error
))
6272 return error_mark_node
;
6278 if (complain
& tf_error
)
6280 binary_op_rich_location
richloc (location
,
6281 orig_op0
, orig_op1
, true);
6283 "invalid operands of types %qT and %qT to binary %qO",
6284 TREE_TYPE (orig_op0
), TREE_TYPE (orig_op1
), code
);
6286 return error_mark_node
;
6289 /* If we're in a template, the only thing we need to know is the
6291 if (processing_template_decl
)
6293 /* Since the middle-end checks the type when doing a build2, we
6294 need to build the tree in pieces. This built tree will never
6295 get out of the front-end as we replace it when instantiating
6297 tree tmp
= build2 (resultcode
,
6298 build_type
? build_type
: result_type
,
6300 TREE_OPERAND (tmp
, 0) = op0
;
6301 if (semantic_result_type
)
6302 tmp
= build1 (EXCESS_PRECISION_EXPR
, semantic_result_type
, tmp
);
6306 /* Remember the original type; RESULT_TYPE might be changed later on
6307 by shorten_binary_op. */
6308 tree orig_type
= result_type
;
6310 if (arithmetic_types_p
)
6312 bool first_complex
= (code0
== COMPLEX_TYPE
);
6313 bool second_complex
= (code1
== COMPLEX_TYPE
);
6314 int none_complex
= (!first_complex
&& !second_complex
);
6316 /* Adapted from patch for c/24581. */
6317 if (first_complex
!= second_complex
6318 && (code
== PLUS_EXPR
6319 || code
== MINUS_EXPR
6320 || code
== MULT_EXPR
6321 || (code
== TRUNC_DIV_EXPR
&& first_complex
))
6322 && TREE_CODE (TREE_TYPE (result_type
)) == REAL_TYPE
6323 && flag_signed_zeros
)
6325 /* An operation on mixed real/complex operands must be
6326 handled specially, but the language-independent code can
6327 more easily optimize the plain complex arithmetic if
6328 -fno-signed-zeros. */
6329 tree real_type
= TREE_TYPE (result_type
);
6333 if (TREE_TYPE (op0
) != result_type
)
6334 op0
= cp_convert_and_check (result_type
, op0
, complain
);
6335 if (TREE_TYPE (op1
) != real_type
)
6336 op1
= cp_convert_and_check (real_type
, op1
, complain
);
6340 if (TREE_TYPE (op0
) != real_type
)
6341 op0
= cp_convert_and_check (real_type
, op0
, complain
);
6342 if (TREE_TYPE (op1
) != result_type
)
6343 op1
= cp_convert_and_check (result_type
, op1
, complain
);
6345 if (TREE_CODE (op0
) == ERROR_MARK
|| TREE_CODE (op1
) == ERROR_MARK
)
6346 return error_mark_node
;
6349 op0
= save_expr (op0
);
6350 real
= cp_build_unary_op (REALPART_EXPR
, op0
, true, complain
);
6351 imag
= cp_build_unary_op (IMAGPART_EXPR
, op0
, true, complain
);
6355 case TRUNC_DIV_EXPR
:
6356 op1
= save_expr (op1
);
6357 imag
= build2 (resultcode
, real_type
, imag
, op1
);
6361 real
= build2 (resultcode
, real_type
, real
, op1
);
6369 op1
= save_expr (op1
);
6370 real
= cp_build_unary_op (REALPART_EXPR
, op1
, true, complain
);
6371 imag
= cp_build_unary_op (IMAGPART_EXPR
, op1
, true, complain
);
6375 op0
= save_expr (op0
);
6376 imag
= build2 (resultcode
, real_type
, op0
, imag
);
6379 real
= build2 (resultcode
, real_type
, op0
, real
);
6382 real
= build2 (resultcode
, real_type
, op0
, real
);
6383 imag
= build1 (NEGATE_EXPR
, real_type
, imag
);
6389 result
= build2 (COMPLEX_EXPR
, result_type
, real
, imag
);
6390 if (semantic_result_type
)
6391 result
= build1 (EXCESS_PRECISION_EXPR
, semantic_result_type
,
6396 /* For certain operations (which identify themselves by shorten != 0)
6397 if both args were extended from the same smaller type,
6398 do the arithmetic in that type and then extend.
6400 shorten !=0 and !=1 indicates a bitwise operation.
6401 For them, this optimization is safe only if
6402 both args are zero-extended or both are sign-extended.
6403 Otherwise, we might change the result.
6404 E.g., (short)-1 | (unsigned short)-1 is (int)-1
6405 but calculated in (unsigned short) it would be (unsigned short)-1. */
6407 if (shorten
&& none_complex
)
6409 final_type
= result_type
;
6410 result_type
= shorten_binary_op (result_type
, op0
, op1
,
6414 /* Shifts can be shortened if shifting right. */
6419 tree arg0
= get_narrower (op0
, &unsigned_arg
);
6420 /* We're not really warning here but when we set short_shift we
6421 used fold_for_warn to fold the operand. */
6422 tree const_op1
= fold_for_warn (op1
);
6424 final_type
= result_type
;
6426 if (arg0
== op0
&& final_type
== TREE_TYPE (op0
))
6427 unsigned_arg
= TYPE_UNSIGNED (TREE_TYPE (op0
));
6429 if (TYPE_PRECISION (TREE_TYPE (arg0
)) < TYPE_PRECISION (result_type
)
6430 && tree_int_cst_sgn (const_op1
) > 0
6431 /* We can shorten only if the shift count is less than the
6432 number of bits in the smaller type size. */
6433 && compare_tree_int (const_op1
,
6434 TYPE_PRECISION (TREE_TYPE (arg0
))) < 0
6435 /* We cannot drop an unsigned shift after sign-extension. */
6436 && (!TYPE_UNSIGNED (final_type
) || unsigned_arg
))
6438 /* Do an unsigned shift if the operand was zero-extended. */
6440 = c_common_signed_or_unsigned_type (unsigned_arg
,
6442 /* Convert value-to-be-shifted to that type. */
6443 if (TREE_TYPE (op0
) != result_type
)
6444 op0
= convert (result_type
, op0
);
6449 /* Comparison operations are shortened too but differently.
6450 They identify themselves by setting short_compare = 1. */
6454 /* We call shorten_compare only for diagnostics. */
6455 tree xop0
= fold_simple (op0
);
6456 tree xop1
= fold_simple (op1
);
6457 tree xresult_type
= result_type
;
6458 enum tree_code xresultcode
= resultcode
;
6459 shorten_compare (location
, &xop0
, &xop1
, &xresult_type
,
6463 if ((short_compare
|| code
== MIN_EXPR
|| code
== MAX_EXPR
)
6464 && warn_sign_compare
6465 /* Do not warn until the template is instantiated; we cannot
6466 bound the ranges of the arguments until that point. */
6467 && !processing_template_decl
6468 && (complain
& tf_warning
)
6469 && c_inhibit_evaluation_warnings
== 0
6470 /* Even unsigned enum types promote to signed int. We don't
6471 want to issue -Wsign-compare warnings for this case. */
6472 && !enum_cast_to_int (orig_op0
)
6473 && !enum_cast_to_int (orig_op1
))
6475 warn_for_sign_compare (location
, orig_op0
, orig_op1
, op0
, op1
,
6476 result_type
, resultcode
);
6480 /* If CONVERTED is zero, both args will be converted to type RESULT_TYPE.
6481 Then the expression will be built.
6482 It will be given type FINAL_TYPE if that is nonzero;
6483 otherwise, it will be given type RESULT_TYPE. */
6486 warning_sentinel
w (warn_sign_conversion
, short_compare
);
6487 if (!same_type_p (TREE_TYPE (op0
), result_type
))
6488 op0
= cp_convert_and_check (result_type
, op0
, complain
);
6489 if (!same_type_p (TREE_TYPE (op1
), result_type
))
6490 op1
= cp_convert_and_check (result_type
, op1
, complain
);
6492 if (op0
== error_mark_node
|| op1
== error_mark_node
)
6493 return error_mark_node
;
6496 if (build_type
== NULL_TREE
)
6497 build_type
= result_type
;
6500 && flag_strong_eval_order
== 2
6501 && TREE_SIDE_EFFECTS (op1
)
6502 && !processing_template_decl
)
6504 /* In C++17, in both op0 << op1 and op0 >> op1 op0 is sequenced before
6505 op1, so if op1 has side-effects, use SAVE_EXPR around op0. */
6506 op0
= cp_save_expr (op0
);
6507 instrument_expr
= op0
;
6510 if (sanitize_flags_p ((SANITIZE_SHIFT
6512 | SANITIZE_FLOAT_DIVIDE
6513 | SANITIZE_SI_OVERFLOW
))
6514 && current_function_decl
!= NULL_TREE
6515 && !processing_template_decl
6516 && (doing_div_or_mod
|| doing_shift
))
6518 /* OP0 and/or OP1 might have side-effects. */
6519 op0
= cp_save_expr (op0
);
6520 op1
= cp_save_expr (op1
);
6521 op0
= fold_non_dependent_expr (op0
, complain
);
6522 op1
= fold_non_dependent_expr (op1
, complain
);
6523 tree instrument_expr1
= NULL_TREE
;
6524 if (doing_div_or_mod
6525 && sanitize_flags_p (SANITIZE_DIVIDE
6526 | SANITIZE_FLOAT_DIVIDE
6527 | SANITIZE_SI_OVERFLOW
))
6529 /* For diagnostics we want to use the promoted types without
6530 shorten_binary_op. So convert the arguments to the
6531 original result_type. */
6534 if (TREE_TYPE (cop0
) != orig_type
)
6535 cop0
= cp_convert (orig_type
, op0
, complain
);
6536 if (TREE_TYPE (cop1
) != orig_type
)
6537 cop1
= cp_convert (orig_type
, op1
, complain
);
6538 instrument_expr1
= ubsan_instrument_division (location
, cop0
, cop1
);
6540 else if (doing_shift
&& sanitize_flags_p (SANITIZE_SHIFT
))
6541 instrument_expr1
= ubsan_instrument_shift (location
, code
, op0
, op1
);
6542 if (instrument_expr
!= NULL
)
6543 instrument_expr
= add_stmt_to_compound (instrument_expr
,
6546 instrument_expr
= instrument_expr1
;
6549 result
= build2_loc (location
, resultcode
, build_type
, op0
, op1
);
6550 if (final_type
!= 0)
6551 result
= cp_convert (final_type
, result
, complain
);
6553 if (instrument_expr
!= NULL
)
6554 result
= build2 (COMPOUND_EXPR
, TREE_TYPE (result
),
6555 instrument_expr
, result
);
6557 if (resultcode
== SPACESHIP_EXPR
&& !processing_template_decl
)
6558 result
= get_target_expr (result
, complain
);
6560 if (semantic_result_type
)
6561 result
= build1 (EXCESS_PRECISION_EXPR
, semantic_result_type
, result
);
6563 if (!c_inhibit_evaluation_warnings
)
6565 if (!processing_template_decl
)
6567 op0
= cp_fully_fold (op0
);
6568 /* Only consider the second argument if the first isn't overflowed. */
6569 if (!CONSTANT_CLASS_P (op0
) || TREE_OVERFLOW_P (op0
))
6571 op1
= cp_fully_fold (op1
);
6572 if (!CONSTANT_CLASS_P (op1
) || TREE_OVERFLOW_P (op1
))
6575 else if (!CONSTANT_CLASS_P (op0
) || !CONSTANT_CLASS_P (op1
)
6576 || TREE_OVERFLOW_P (op0
) || TREE_OVERFLOW_P (op1
))
6579 tree result_ovl
= fold_build2 (resultcode
, build_type
, op0
, op1
);
6580 if (TREE_OVERFLOW_P (result_ovl
))
6581 overflow_warning (location
, result_ovl
);
6587 /* Build a VEC_PERM_EXPR.
6588 This is a simple wrapper for c_build_vec_perm_expr. */
6590 build_x_vec_perm_expr (location_t loc
,
6591 tree arg0
, tree arg1
, tree arg2
,
6592 tsubst_flags_t complain
)
6594 tree orig_arg0
= arg0
;
6595 tree orig_arg1
= arg1
;
6596 tree orig_arg2
= arg2
;
6597 if (processing_template_decl
)
6599 if (type_dependent_expression_p (arg0
)
6600 || type_dependent_expression_p (arg1
)
6601 || type_dependent_expression_p (arg2
))
6602 return build_min_nt_loc (loc
, VEC_PERM_EXPR
, arg0
, arg1
, arg2
);
6603 arg0
= build_non_dependent_expr (arg0
);
6605 arg1
= build_non_dependent_expr (arg1
);
6606 arg2
= build_non_dependent_expr (arg2
);
6608 tree exp
= c_build_vec_perm_expr (loc
, arg0
, arg1
, arg2
, complain
& tf_error
);
6609 if (processing_template_decl
&& exp
!= error_mark_node
)
6610 return build_min_non_dep (VEC_PERM_EXPR
, exp
, orig_arg0
,
6611 orig_arg1
, orig_arg2
);
6615 /* Build a VEC_PERM_EXPR.
6616 This is a simple wrapper for c_build_shufflevector. */
6618 build_x_shufflevector (location_t loc
, vec
<tree
, va_gc
> *args
,
6619 tsubst_flags_t complain
)
6621 tree arg0
= (*args
)[0];
6622 tree arg1
= (*args
)[1];
6623 if (processing_template_decl
)
6625 for (unsigned i
= 0; i
< args
->length (); ++i
)
6627 ? type_dependent_expression_p ((*args
)[i
])
6628 : instantiation_dependent_expression_p ((*args
)[i
]))
6630 tree exp
= build_min_nt_call_vec (NULL
, args
);
6631 CALL_EXPR_IFN (exp
) = IFN_SHUFFLEVECTOR
;
6634 arg0
= build_non_dependent_expr (arg0
);
6635 arg1
= build_non_dependent_expr (arg1
);
6636 /* ??? Nothing needed for the index arguments? */
6638 auto_vec
<tree
, 16> mask
;
6639 for (unsigned i
= 2; i
< args
->length (); ++i
)
6641 tree idx
= fold_non_dependent_expr ((*args
)[i
], complain
);
6642 mask
.safe_push (idx
);
6644 tree exp
= c_build_shufflevector (loc
, arg0
, arg1
, mask
, complain
& tf_error
);
6645 if (processing_template_decl
&& exp
!= error_mark_node
)
6647 exp
= build_min_non_dep_call_vec (exp
, NULL
, args
);
6648 CALL_EXPR_IFN (exp
) = IFN_SHUFFLEVECTOR
;
6653 /* Return a tree for the sum or difference (RESULTCODE says which)
6654 of pointer PTROP and integer INTOP. */
6657 cp_pointer_int_sum (location_t loc
, enum tree_code resultcode
, tree ptrop
,
6658 tree intop
, tsubst_flags_t complain
)
6660 tree res_type
= TREE_TYPE (ptrop
);
6662 /* pointer_int_sum() uses size_in_bytes() on the TREE_TYPE(res_type)
6663 in certain circumstance (when it's valid to do so). So we need
6664 to make sure it's complete. We don't need to check here, if we
6665 can actually complete it at all, as those checks will be done in
6666 pointer_int_sum() anyway. */
6667 complete_type (TREE_TYPE (res_type
));
6669 return pointer_int_sum (loc
, resultcode
, ptrop
,
6670 intop
, complain
& tf_warning_or_error
);
6673 /* Return a tree for the difference of pointers OP0 and OP1.
6674 The resulting tree has type int. If POINTER_SUBTRACT sanitization is
6675 enabled, assign to INSTRUMENT_EXPR call to libsanitizer. */
6678 pointer_diff (location_t loc
, tree op0
, tree op1
, tree ptrtype
,
6679 tsubst_flags_t complain
, tree
*instrument_expr
)
6681 tree result
, inttype
;
6682 tree restype
= ptrdiff_type_node
;
6683 tree target_type
= TREE_TYPE (ptrtype
);
6685 if (!complete_type_or_maybe_complain (target_type
, NULL_TREE
, complain
))
6686 return error_mark_node
;
6688 if (VOID_TYPE_P (target_type
))
6690 if (complain
& tf_error
)
6691 permerror (loc
, "ISO C++ forbids using pointer of "
6692 "type %<void *%> in subtraction");
6694 return error_mark_node
;
6696 if (TREE_CODE (target_type
) == FUNCTION_TYPE
)
6698 if (complain
& tf_error
)
6699 permerror (loc
, "ISO C++ forbids using pointer to "
6700 "a function in subtraction");
6702 return error_mark_node
;
6704 if (TREE_CODE (target_type
) == METHOD_TYPE
)
6706 if (complain
& tf_error
)
6707 permerror (loc
, "ISO C++ forbids using pointer to "
6708 "a method in subtraction");
6710 return error_mark_node
;
6712 else if (!verify_type_context (loc
, TCTX_POINTER_ARITH
,
6713 TREE_TYPE (TREE_TYPE (op0
)),
6714 !(complain
& tf_error
))
6715 || !verify_type_context (loc
, TCTX_POINTER_ARITH
,
6716 TREE_TYPE (TREE_TYPE (op1
)),
6717 !(complain
& tf_error
)))
6718 return error_mark_node
;
6720 /* Determine integer type result of the subtraction. This will usually
6721 be the same as the result type (ptrdiff_t), but may need to be a wider
6722 type if pointers for the address space are wider than ptrdiff_t. */
6723 if (TYPE_PRECISION (restype
) < TYPE_PRECISION (TREE_TYPE (op0
)))
6724 inttype
= c_common_type_for_size (TYPE_PRECISION (TREE_TYPE (op0
)), 0);
6728 if (!processing_template_decl
6729 && sanitize_flags_p (SANITIZE_POINTER_SUBTRACT
))
6731 op0
= save_expr (op0
);
6732 op1
= save_expr (op1
);
6734 tree tt
= builtin_decl_explicit (BUILT_IN_ASAN_POINTER_SUBTRACT
);
6735 *instrument_expr
= build_call_expr_loc (loc
, tt
, 2, op0
, op1
);
6738 /* First do the subtraction, then build the divide operator
6739 and only convert at the very end.
6740 Do not do default conversions in case restype is a short type. */
6742 /* POINTER_DIFF_EXPR requires a signed integer type of the same size as
6743 pointers. If some platform cannot provide that, or has a larger
6744 ptrdiff_type to support differences larger than half the address
6745 space, cast the pointers to some larger integer type and do the
6746 computations in that type. */
6747 if (TYPE_PRECISION (inttype
) > TYPE_PRECISION (TREE_TYPE (op0
)))
6748 op0
= cp_build_binary_op (loc
,
6750 cp_convert (inttype
, op0
, complain
),
6751 cp_convert (inttype
, op1
, complain
),
6754 op0
= build2_loc (loc
, POINTER_DIFF_EXPR
, inttype
, op0
, op1
);
6756 /* This generates an error if op1 is a pointer to an incomplete type. */
6757 if (!COMPLETE_TYPE_P (TREE_TYPE (TREE_TYPE (op1
))))
6759 if (complain
& tf_error
)
6760 error_at (loc
, "invalid use of a pointer to an incomplete type in "
6761 "pointer arithmetic");
6763 return error_mark_node
;
6766 if (pointer_to_zero_sized_aggr_p (TREE_TYPE (op1
)))
6768 if (complain
& tf_error
)
6769 error_at (loc
, "arithmetic on pointer to an empty aggregate");
6771 return error_mark_node
;
6774 op1
= (TYPE_PTROB_P (ptrtype
)
6775 ? size_in_bytes_loc (loc
, target_type
)
6776 : integer_one_node
);
6778 /* Do the division. */
6780 result
= build2_loc (loc
, EXACT_DIV_EXPR
, inttype
, op0
,
6781 cp_convert (inttype
, op1
, complain
));
6782 return cp_convert (restype
, result
, complain
);
6785 /* Construct and perhaps optimize a tree representation
6786 for a unary operation. CODE, a tree_code, specifies the operation
6787 and XARG is the operand. */
6790 build_x_unary_op (location_t loc
, enum tree_code code
, cp_expr xarg
,
6791 tree lookups
, tsubst_flags_t complain
)
6793 tree orig_expr
= xarg
;
6796 tree overload
= NULL_TREE
;
6798 if (processing_template_decl
)
6800 if (type_dependent_expression_p (xarg
))
6802 tree e
= build_min_nt_loc (loc
, code
, xarg
.get_value (), NULL_TREE
);
6803 TREE_TYPE (e
) = build_dependent_operator_type (lookups
, code
, false);
6807 xarg
= build_non_dependent_expr (xarg
);
6812 /* [expr.unary.op] says:
6814 The address of an object of incomplete type can be taken.
6816 (And is just the ordinary address operator, not an overloaded
6817 "operator &".) However, if the type is a template
6818 specialization, we must complete the type at this point so that
6819 an overloaded "operator &" will be available if required. */
6820 if (code
== ADDR_EXPR
6821 && TREE_CODE (xarg
) != TEMPLATE_ID_EXPR
6822 && ((CLASS_TYPE_P (TREE_TYPE (xarg
))
6823 && !COMPLETE_TYPE_P (complete_type (TREE_TYPE (xarg
))))
6824 || (TREE_CODE (xarg
) == OFFSET_REF
)))
6825 /* Don't look for a function. */;
6827 exp
= build_new_op (loc
, code
, LOOKUP_NORMAL
, xarg
, NULL_TREE
,
6828 NULL_TREE
, lookups
, &overload
, complain
);
6830 if (!exp
&& code
== ADDR_EXPR
)
6832 if (is_overloaded_fn (xarg
))
6834 tree fn
= get_first_fn (xarg
);
6835 if (DECL_CONSTRUCTOR_P (fn
) || DECL_DESTRUCTOR_P (fn
))
6837 if (complain
& tf_error
)
6838 error_at (loc
, DECL_CONSTRUCTOR_P (fn
)
6839 ? G_("taking address of constructor %qD")
6840 : G_("taking address of destructor %qD"),
6842 return error_mark_node
;
6846 /* A pointer to member-function can be formed only by saying
6848 if (!flag_ms_extensions
&& TREE_CODE (TREE_TYPE (xarg
)) == METHOD_TYPE
6849 && (TREE_CODE (xarg
) != OFFSET_REF
|| !PTRMEM_OK_P (xarg
)))
6851 if (TREE_CODE (xarg
) != OFFSET_REF
6852 || !TYPE_P (TREE_OPERAND (xarg
, 0)))
6854 if (complain
& tf_error
)
6856 error_at (loc
, "invalid use of %qE to form a "
6857 "pointer-to-member-function", xarg
.get_value ());
6858 if (TREE_CODE (xarg
) != OFFSET_REF
)
6859 inform (loc
, " a qualified-id is required");
6861 return error_mark_node
;
6865 if (complain
& tf_error
)
6866 error_at (loc
, "parentheses around %qE cannot be used to "
6867 "form a pointer-to-member-function",
6870 return error_mark_node
;
6871 PTRMEM_OK_P (xarg
) = 1;
6875 if (TREE_CODE (xarg
) == OFFSET_REF
)
6877 ptrmem
= PTRMEM_OK_P (xarg
);
6879 if (!ptrmem
&& !flag_ms_extensions
6880 && TREE_CODE (TREE_TYPE (TREE_OPERAND (xarg
, 1))) == METHOD_TYPE
)
6882 /* A single non-static member, make sure we don't allow a
6883 pointer-to-member. */
6884 xarg
= build2 (OFFSET_REF
, TREE_TYPE (xarg
),
6885 TREE_OPERAND (xarg
, 0),
6886 ovl_make (TREE_OPERAND (xarg
, 1)));
6887 PTRMEM_OK_P (xarg
) = ptrmem
;
6891 exp
= cp_build_addr_expr_strict (xarg
, complain
);
6893 if (TREE_CODE (exp
) == PTRMEM_CST
)
6894 PTRMEM_CST_LOCATION (exp
) = loc
;
6896 protected_set_expr_location (exp
, loc
);
6899 if (processing_template_decl
&& exp
!= error_mark_node
)
6901 if (overload
!= NULL_TREE
)
6902 return (build_min_non_dep_op_overload
6903 (code
, exp
, overload
, orig_expr
, integer_zero_node
));
6905 exp
= build_min_non_dep (code
, exp
, orig_expr
,
6906 /*For {PRE,POST}{INC,DEC}REMENT_EXPR*/NULL_TREE
);
6908 if (TREE_CODE (exp
) == ADDR_EXPR
)
6909 PTRMEM_OK_P (exp
) = ptrmem
;
6913 /* Construct and perhaps optimize a tree representation
6914 for __builtin_addressof operation. ARG specifies the operand. */
6917 cp_build_addressof (location_t loc
, tree arg
, tsubst_flags_t complain
)
6919 tree orig_expr
= arg
;
6921 if (processing_template_decl
)
6923 if (type_dependent_expression_p (arg
))
6924 return build_min_nt_loc (loc
, ADDRESSOF_EXPR
, arg
, NULL_TREE
);
6926 arg
= build_non_dependent_expr (arg
);
6929 tree exp
= cp_build_addr_expr_strict (arg
, complain
);
6931 if (processing_template_decl
&& exp
!= error_mark_node
)
6932 exp
= build_min_non_dep (ADDRESSOF_EXPR
, exp
, orig_expr
, NULL_TREE
);
6936 /* Like c_common_truthvalue_conversion, but handle pointer-to-member
6937 constants, where a null value is represented by an INTEGER_CST of
6941 cp_truthvalue_conversion (tree expr
, tsubst_flags_t complain
)
6943 tree type
= TREE_TYPE (expr
);
6944 location_t loc
= cp_expr_loc_or_input_loc (expr
);
6945 if (TYPE_PTR_OR_PTRMEM_P (type
)
6946 /* Avoid ICE on invalid use of non-static member function. */
6947 || TREE_CODE (expr
) == FUNCTION_DECL
)
6948 return cp_build_binary_op (loc
, NE_EXPR
, expr
, nullptr_node
, complain
);
6950 return c_common_truthvalue_conversion (loc
, expr
);
6953 /* Returns EXPR contextually converted to bool. */
6956 contextual_conv_bool (tree expr
, tsubst_flags_t complain
)
6958 return perform_implicit_conversion_flags (boolean_type_node
, expr
,
6959 complain
, LOOKUP_NORMAL
);
6962 /* Just like cp_truthvalue_conversion, but we want a CLEANUP_POINT_EXPR. This
6963 is a low-level function; most callers should use maybe_convert_cond. */
6966 condition_conversion (tree expr
)
6968 tree t
= contextual_conv_bool (expr
, tf_warning_or_error
);
6969 if (!processing_template_decl
)
6970 t
= fold_build_cleanup_point_expr (boolean_type_node
, t
);
6974 /* Returns the address of T. This function will fold away
6975 ADDR_EXPR of INDIRECT_REF. This is only for low-level usage;
6976 most places should use cp_build_addr_expr instead. */
6979 build_address (tree t
)
6981 if (error_operand_p (t
) || !cxx_mark_addressable (t
))
6982 return error_mark_node
;
6983 gcc_checking_assert (TREE_CODE (t
) != CONSTRUCTOR
6984 || processing_template_decl
);
6985 t
= build_fold_addr_expr_loc (EXPR_LOCATION (t
), t
);
6986 if (TREE_CODE (t
) != ADDR_EXPR
)
6991 /* Return a NOP_EXPR converting EXPR to TYPE. */
6994 build_nop (tree type
, tree expr
)
6996 if (type
== error_mark_node
|| error_operand_p (expr
))
6998 return build1_loc (EXPR_LOCATION (expr
), NOP_EXPR
, type
, expr
);
7001 /* Take the address of ARG, whatever that means under C++ semantics.
7002 If STRICT_LVALUE is true, require an lvalue; otherwise, allow xvalues
7003 and class rvalues as well.
7005 Nothing should call this function directly; instead, callers should use
7006 cp_build_addr_expr or cp_build_addr_expr_strict. */
7009 cp_build_addr_expr_1 (tree arg
, bool strict_lvalue
, tsubst_flags_t complain
)
7014 if (!arg
|| error_operand_p (arg
))
7015 return error_mark_node
;
7017 arg
= mark_lvalue_use (arg
);
7018 if (error_operand_p (arg
))
7019 return error_mark_node
;
7021 argtype
= lvalue_type (arg
);
7022 location_t loc
= cp_expr_loc_or_input_loc (arg
);
7024 gcc_assert (!(identifier_p (arg
) && IDENTIFIER_ANY_OP_P (arg
)));
7026 if (TREE_CODE (arg
) == COMPONENT_REF
&& type_unknown_p (arg
)
7027 && !really_overloaded_fn (arg
))
7029 /* They're trying to take the address of a unique non-static
7030 member function. This is ill-formed (except in MS-land),
7031 but let's try to DTRT.
7032 Note: We only handle unique functions here because we don't
7033 want to complain if there's a static overload; non-unique
7034 cases will be handled by instantiate_type. But we need to
7035 handle this case here to allow casts on the resulting PMF.
7036 We could defer this in non-MS mode, but it's easier to give
7037 a useful error here. */
7039 /* Inside constant member functions, the `this' pointer
7040 contains an extra const qualifier. TYPE_MAIN_VARIANT
7041 is used here to remove this const from the diagnostics
7042 and the created OFFSET_REF. */
7043 tree base
= TYPE_MAIN_VARIANT (TREE_TYPE (TREE_OPERAND (arg
, 0)));
7044 tree fn
= get_first_fn (TREE_OPERAND (arg
, 1));
7045 if (!mark_used (fn
, complain
) && !(complain
& tf_error
))
7046 return error_mark_node
;
7048 if (! flag_ms_extensions
)
7050 tree name
= DECL_NAME (fn
);
7051 if (!(complain
& tf_error
))
7052 return error_mark_node
;
7053 else if (current_class_type
7054 && TREE_OPERAND (arg
, 0) == current_class_ref
)
7055 /* An expression like &memfn. */
7057 "ISO C++ forbids taking the address of an unqualified"
7058 " or parenthesized non-static member function to form"
7059 " a pointer to member function. Say %<&%T::%D%>",
7063 "ISO C++ forbids taking the address of a bound member"
7064 " function to form a pointer to member function."
7068 arg
= build_offset_ref (base
, fn
, /*address_p=*/true, complain
);
7071 /* Uninstantiated types are all functions. Taking the
7072 address of a function is a no-op, so just return the
7074 if (type_unknown_p (arg
))
7075 return build1 (ADDR_EXPR
, unknown_type_node
, arg
);
7077 if (TREE_CODE (arg
) == OFFSET_REF
)
7078 /* We want a pointer to member; bypass all the code for actually taking
7079 the address of something. */
7082 /* Anything not already handled and not a true memory reference
7084 if (!FUNC_OR_METHOD_TYPE_P (argtype
))
7086 cp_lvalue_kind kind
= lvalue_kind (arg
);
7087 if (kind
== clk_none
)
7089 if (complain
& tf_error
)
7090 lvalue_error (loc
, lv_addressof
);
7091 return error_mark_node
;
7093 if (strict_lvalue
&& (kind
& (clk_rvalueref
|clk_class
)))
7095 if (!(complain
& tf_error
))
7096 return error_mark_node
;
7097 /* Make this a permerror because we used to accept it. */
7098 permerror (loc
, "taking address of rvalue");
7102 if (TYPE_REF_P (argtype
))
7104 tree type
= build_pointer_type (TREE_TYPE (argtype
));
7105 arg
= build1 (CONVERT_EXPR
, type
, arg
);
7108 else if (pedantic
&& DECL_MAIN_P (tree_strip_any_location_wrapper (arg
)))
7111 /* Apparently a lot of autoconf scripts for C++ packages do this,
7112 so only complain if -Wpedantic. */
7113 if (complain
& (flag_pedantic_errors
? tf_error
: tf_warning
))
7114 pedwarn (loc
, OPT_Wpedantic
,
7115 "ISO C++ forbids taking address of function %<::main%>");
7116 else if (flag_pedantic_errors
)
7117 return error_mark_node
;
7120 /* Let &* cancel out to simplify resulting code. */
7121 if (INDIRECT_REF_P (arg
))
7123 arg
= TREE_OPERAND (arg
, 0);
7124 if (TYPE_REF_P (TREE_TYPE (arg
)))
7126 tree type
= build_pointer_type (TREE_TYPE (TREE_TYPE (arg
)));
7127 arg
= build1 (CONVERT_EXPR
, type
, arg
);
7130 /* Don't let this be an lvalue. */
7135 /* Handle complex lvalues (when permitted)
7136 by reduction to simpler cases. */
7137 val
= unary_complex_lvalue (ADDR_EXPR
, arg
);
7141 switch (TREE_CODE (arg
))
7145 case FIX_TRUNC_EXPR
:
7146 /* We should have handled this above in the lvalue_kind check. */
7151 arg
= BASELINK_FUNCTIONS (arg
);
7155 arg
= OVL_FIRST (arg
);
7160 /* Turn a reference to a non-static data member into a
7161 pointer-to-member. */
7166 gcc_assert (PTRMEM_OK_P (arg
));
7168 t
= TREE_OPERAND (arg
, 1);
7169 if (TYPE_REF_P (TREE_TYPE (t
)))
7171 if (complain
& tf_error
)
7173 "cannot create pointer to reference member %qD", t
);
7174 return error_mark_node
;
7177 /* Forming a pointer-to-member is a use of non-pure-virtual fns. */
7178 if (TREE_CODE (t
) == FUNCTION_DECL
7179 && !DECL_PURE_VIRTUAL_P (t
)
7180 && !mark_used (t
, complain
) && !(complain
& tf_error
))
7181 return error_mark_node
;
7183 type
= build_ptrmem_type (context_for_name_lookup (t
),
7185 t
= make_ptrmem_cst (type
, t
);
7193 if (argtype
!= error_mark_node
)
7194 argtype
= build_pointer_type (argtype
);
7196 if (bitfield_p (arg
))
7198 if (complain
& tf_error
)
7199 error_at (loc
, "attempt to take address of bit-field");
7200 return error_mark_node
;
7203 /* In a template, we are processing a non-dependent expression
7204 so we can just form an ADDR_EXPR with the correct type. */
7205 if (processing_template_decl
|| TREE_CODE (arg
) != COMPONENT_REF
)
7207 if (!mark_single_function (arg
, complain
))
7208 return error_mark_node
;
7209 val
= build_address (arg
);
7210 if (TREE_CODE (arg
) == OFFSET_REF
)
7211 PTRMEM_OK_P (val
) = PTRMEM_OK_P (arg
);
7213 else if (BASELINK_P (TREE_OPERAND (arg
, 1)))
7215 tree fn
= BASELINK_FUNCTIONS (TREE_OPERAND (arg
, 1));
7217 /* We can only get here with a single static member
7219 gcc_assert (TREE_CODE (fn
) == FUNCTION_DECL
7220 && DECL_STATIC_FUNCTION_P (fn
));
7221 if (!mark_used (fn
, complain
) && !(complain
& tf_error
))
7222 return error_mark_node
;
7223 val
= build_address (fn
);
7224 if (TREE_SIDE_EFFECTS (TREE_OPERAND (arg
, 0)))
7225 /* Do not lose object's side effects. */
7226 val
= build2 (COMPOUND_EXPR
, TREE_TYPE (val
),
7227 TREE_OPERAND (arg
, 0), val
);
7231 tree object
= TREE_OPERAND (arg
, 0);
7232 tree field
= TREE_OPERAND (arg
, 1);
7233 gcc_assert (same_type_ignoring_top_level_qualifiers_p
7234 (TREE_TYPE (object
), decl_type_context (field
)));
7235 val
= build_address (arg
);
7238 if (TYPE_PTR_P (argtype
)
7239 && TREE_CODE (TREE_TYPE (argtype
)) == METHOD_TYPE
)
7241 build_ptrmemfunc_type (argtype
);
7242 val
= build_ptrmemfunc (argtype
, val
, 0,
7247 /* For addresses of immediate functions ensure we have EXPR_LOCATION
7248 set for possible later diagnostics. */
7249 if (TREE_CODE (val
) == ADDR_EXPR
7250 && TREE_CODE (TREE_OPERAND (val
, 0)) == FUNCTION_DECL
7251 && DECL_IMMEDIATE_FUNCTION_P (TREE_OPERAND (val
, 0)))
7252 SET_EXPR_LOCATION (val
, input_location
);
7257 /* Take the address of ARG if it has one, even if it's an rvalue. */
7260 cp_build_addr_expr (tree arg
, tsubst_flags_t complain
)
7262 return cp_build_addr_expr_1 (arg
, 0, complain
);
7265 /* Take the address of ARG, but only if it's an lvalue. */
7268 cp_build_addr_expr_strict (tree arg
, tsubst_flags_t complain
)
7270 return cp_build_addr_expr_1 (arg
, 1, complain
);
7273 /* C++: Must handle pointers to members.
7275 Perhaps type instantiation should be extended to handle conversion
7276 from aggregates to types we don't yet know we want? (Or are those
7277 cases typically errors which should be reported?)
7279 NOCONVERT suppresses the default promotions (such as from short to int). */
7282 cp_build_unary_op (enum tree_code code
, tree xarg
, bool noconvert
,
7283 tsubst_flags_t complain
)
7285 /* No default_conversion here. It causes trouble for ADDR_EXPR. */
7287 location_t location
= cp_expr_loc_or_input_loc (arg
);
7289 tree eptype
= NULL_TREE
;
7290 const char *errstring
= NULL
;
7292 const char *invalid_op_diag
;
7294 if (!arg
|| error_operand_p (arg
))
7295 return error_mark_node
;
7297 arg
= resolve_nondeduced_context (arg
, complain
);
7299 if ((invalid_op_diag
7300 = targetm
.invalid_unary_op ((code
== UNARY_PLUS_EXPR
7305 if (complain
& tf_error
)
7306 error (invalid_op_diag
);
7307 return error_mark_node
;
7310 if (TREE_CODE (arg
) == EXCESS_PRECISION_EXPR
)
7312 eptype
= TREE_TYPE (arg
);
7313 arg
= TREE_OPERAND (arg
, 0);
7318 case UNARY_PLUS_EXPR
:
7321 int flags
= WANT_ARITH
| WANT_ENUM
;
7322 /* Unary plus (but not unary minus) is allowed on pointers. */
7323 if (code
== UNARY_PLUS_EXPR
)
7324 flags
|= WANT_POINTER
;
7325 arg
= build_expr_type_conversion (flags
, arg
, true);
7327 errstring
= (code
== NEGATE_EXPR
7328 ? _("wrong type argument to unary minus")
7329 : _("wrong type argument to unary plus"));
7332 if (!noconvert
&& INTEGRAL_OR_ENUMERATION_TYPE_P (TREE_TYPE (arg
)))
7333 arg
= cp_perform_integral_promotions (arg
, complain
);
7335 /* Make sure the result is not an lvalue: a unary plus or minus
7336 expression is always a rvalue. */
7343 if (TREE_CODE (TREE_TYPE (arg
)) == COMPLEX_TYPE
)
7348 arg
= cp_default_conversion (arg
, complain
);
7349 if (arg
== error_mark_node
)
7350 return error_mark_node
;
7353 else if (!(arg
= build_expr_type_conversion (WANT_INT
| WANT_ENUM
7354 | WANT_VECTOR_OR_COMPLEX
,
7356 errstring
= _("wrong type argument to bit-complement");
7357 else if (!noconvert
&& INTEGRAL_OR_ENUMERATION_TYPE_P (TREE_TYPE (arg
)))
7359 /* Warn if the expression has boolean value. */
7360 if (TREE_CODE (TREE_TYPE (arg
)) == BOOLEAN_TYPE
7361 && (complain
& tf_warning
)
7362 && warning_at (location
, OPT_Wbool_operation
,
7363 "%<~%> on an expression of type %<bool%>"))
7364 inform (location
, "did you mean to use logical not (%<!%>)?");
7365 arg
= cp_perform_integral_promotions (arg
, complain
);
7367 else if (!noconvert
&& VECTOR_TYPE_P (TREE_TYPE (arg
)))
7368 arg
= mark_rvalue_use (arg
);
7372 if (!(arg
= build_expr_type_conversion (WANT_ARITH
| WANT_ENUM
, arg
, true)))
7373 errstring
= _("wrong type argument to abs");
7374 else if (!noconvert
)
7376 arg
= cp_default_conversion (arg
, complain
);
7377 if (arg
== error_mark_node
)
7378 return error_mark_node
;
7383 /* Conjugating a real value is a no-op, but allow it anyway. */
7384 if (!(arg
= build_expr_type_conversion (WANT_ARITH
| WANT_ENUM
, arg
, true)))
7385 errstring
= _("wrong type argument to conjugation");
7386 else if (!noconvert
)
7388 arg
= cp_default_conversion (arg
, complain
);
7389 if (arg
== error_mark_node
)
7390 return error_mark_node
;
7394 case TRUTH_NOT_EXPR
:
7395 if (gnu_vector_type_p (TREE_TYPE (arg
)))
7396 return cp_build_binary_op (input_location
, EQ_EXPR
, arg
,
7397 build_zero_cst (TREE_TYPE (arg
)), complain
);
7398 arg
= perform_implicit_conversion (boolean_type_node
, arg
,
7400 if (arg
!= error_mark_node
)
7402 val
= invert_truthvalue_loc (location
, arg
);
7403 if (obvalue_p (val
))
7404 val
= non_lvalue_loc (location
, val
);
7407 errstring
= _("in argument to unary !");
7415 val
= build_real_imag_expr (input_location
, code
, arg
);
7416 if (eptype
&& TREE_CODE (eptype
) == COMPLEX_EXPR
)
7417 val
= build1_loc (input_location
, EXCESS_PRECISION_EXPR
,
7418 TREE_TYPE (eptype
), val
);
7421 case PREINCREMENT_EXPR
:
7422 case POSTINCREMENT_EXPR
:
7423 case PREDECREMENT_EXPR
:
7424 case POSTDECREMENT_EXPR
:
7425 /* Handle complex lvalues (when permitted)
7426 by reduction to simpler cases. */
7428 val
= unary_complex_lvalue (code
, arg
);
7430 goto return_build_unary_op
;
7432 arg
= mark_lvalue_use (arg
);
7434 /* Increment or decrement the real part of the value,
7435 and don't change the imaginary part. */
7436 if (TREE_CODE (TREE_TYPE (arg
)) == COMPLEX_TYPE
)
7440 arg
= cp_stabilize_reference (arg
);
7441 real
= cp_build_unary_op (REALPART_EXPR
, arg
, true, complain
);
7442 imag
= cp_build_unary_op (IMAGPART_EXPR
, arg
, true, complain
);
7443 real
= cp_build_unary_op (code
, real
, true, complain
);
7444 if (real
== error_mark_node
|| imag
== error_mark_node
)
7445 return error_mark_node
;
7446 val
= build2 (COMPLEX_EXPR
, TREE_TYPE (arg
), real
, imag
);
7447 goto return_build_unary_op
;
7450 /* Report invalid types. */
7452 if (!(arg
= build_expr_type_conversion (WANT_ARITH
| WANT_POINTER
,
7455 if (code
== PREINCREMENT_EXPR
)
7456 errstring
= _("no pre-increment operator for type");
7457 else if (code
== POSTINCREMENT_EXPR
)
7458 errstring
= _("no post-increment operator for type");
7459 else if (code
== PREDECREMENT_EXPR
)
7460 errstring
= _("no pre-decrement operator for type");
7462 errstring
= _("no post-decrement operator for type");
7465 else if (arg
== error_mark_node
)
7466 return error_mark_node
;
7468 /* Report something read-only. */
7470 if (CP_TYPE_CONST_P (TREE_TYPE (arg
))
7471 || TREE_READONLY (arg
))
7473 if (complain
& tf_error
)
7474 cxx_readonly_error (location
, arg
,
7475 ((code
== PREINCREMENT_EXPR
7476 || code
== POSTINCREMENT_EXPR
)
7477 ? lv_increment
: lv_decrement
));
7479 return error_mark_node
;
7484 tree declared_type
= unlowered_expr_type (arg
);
7486 argtype
= TREE_TYPE (arg
);
7488 /* ARM $5.2.5 last annotation says this should be forbidden. */
7489 if (TREE_CODE (argtype
) == ENUMERAL_TYPE
)
7491 if (complain
& tf_error
)
7492 permerror (location
, (code
== PREINCREMENT_EXPR
7493 || code
== POSTINCREMENT_EXPR
)
7494 ? G_("ISO C++ forbids incrementing an enum")
7495 : G_("ISO C++ forbids decrementing an enum"));
7497 return error_mark_node
;
7500 /* Compute the increment. */
7502 if (TYPE_PTR_P (argtype
))
7504 tree type
= complete_type (TREE_TYPE (argtype
));
7506 if (!COMPLETE_OR_VOID_TYPE_P (type
))
7508 if (complain
& tf_error
)
7509 error_at (location
, ((code
== PREINCREMENT_EXPR
7510 || code
== POSTINCREMENT_EXPR
))
7511 ? G_("cannot increment a pointer to incomplete "
7513 : G_("cannot decrement a pointer to incomplete "
7515 TREE_TYPE (argtype
));
7517 return error_mark_node
;
7519 else if (!TYPE_PTROB_P (argtype
))
7521 if (complain
& tf_error
)
7522 pedwarn (location
, OPT_Wpointer_arith
,
7523 (code
== PREINCREMENT_EXPR
7524 || code
== POSTINCREMENT_EXPR
)
7525 ? G_("ISO C++ forbids incrementing a pointer "
7527 : G_("ISO C++ forbids decrementing a pointer "
7531 return error_mark_node
;
7533 else if (!verify_type_context (location
, TCTX_POINTER_ARITH
,
7534 TREE_TYPE (argtype
),
7535 !(complain
& tf_error
)))
7536 return error_mark_node
;
7538 inc
= cxx_sizeof_nowarn (TREE_TYPE (argtype
));
7541 inc
= VECTOR_TYPE_P (argtype
)
7542 ? build_one_cst (argtype
)
7545 inc
= cp_convert (argtype
, inc
, complain
);
7547 /* If 'arg' is an Objective-C PROPERTY_REF expression, then we
7548 need to ask Objective-C to build the increment or decrement
7549 expression for it. */
7550 if (objc_is_property_ref (arg
))
7551 return objc_build_incr_expr_for_property_ref (input_location
, code
,
7554 /* Complain about anything else that is not a true lvalue. */
7555 if (!lvalue_or_else (arg
, ((code
== PREINCREMENT_EXPR
7556 || code
== POSTINCREMENT_EXPR
)
7557 ? lv_increment
: lv_decrement
),
7559 return error_mark_node
;
7561 /* [depr.volatile.type] "Postfix ++ and -- expressions and
7562 prefix ++ and -- expressions of volatile-qualified arithmetic
7563 and pointer types are deprecated." */
7564 if ((TREE_THIS_VOLATILE (arg
) || CP_TYPE_VOLATILE_P (TREE_TYPE (arg
)))
7565 && (complain
& tf_warning
))
7566 warning_at (location
, OPT_Wvolatile
,
7567 "%qs expression of %<volatile%>-qualified type is "
7569 ((code
== PREINCREMENT_EXPR
7570 || code
== POSTINCREMENT_EXPR
)
7573 /* Forbid using -- or ++ in C++17 on `bool'. */
7574 if (TREE_CODE (declared_type
) == BOOLEAN_TYPE
)
7576 if (code
== POSTDECREMENT_EXPR
|| code
== PREDECREMENT_EXPR
)
7578 if (complain
& tf_error
)
7580 "use of an operand of type %qT in %<operator--%> "
7581 "is forbidden", boolean_type_node
);
7582 return error_mark_node
;
7586 if (cxx_dialect
>= cxx17
)
7588 if (complain
& tf_error
)
7590 "use of an operand of type %qT in "
7591 "%<operator++%> is forbidden in C++17",
7593 return error_mark_node
;
7595 /* Otherwise, [depr.incr.bool] says this is deprecated. */
7596 else if (complain
& tf_warning
)
7597 warning_at (location
, OPT_Wdeprecated
,
7598 "use of an operand of type %qT "
7599 "in %<operator++%> is deprecated",
7602 val
= boolean_increment (code
, arg
);
7604 else if (code
== POSTINCREMENT_EXPR
|| code
== POSTDECREMENT_EXPR
)
7605 /* An rvalue has no cv-qualifiers. */
7606 val
= build2 (code
, cv_unqualified (TREE_TYPE (arg
)), arg
, inc
);
7608 val
= build2 (code
, TREE_TYPE (arg
), arg
, inc
);
7610 TREE_SIDE_EFFECTS (val
) = 1;
7611 goto return_build_unary_op
;
7615 /* Note that this operation never does default_conversion
7616 regardless of NOCONVERT. */
7617 return cp_build_addr_expr (arg
, complain
);
7626 argtype
= TREE_TYPE (arg
);
7627 val
= build1 (code
, argtype
, arg
);
7628 return_build_unary_op
:
7630 val
= build1 (EXCESS_PRECISION_EXPR
, eptype
, val
);
7634 if (complain
& tf_error
)
7635 error_at (location
, "%s", errstring
);
7636 return error_mark_node
;
7639 /* Hook for the c-common bits that build a unary op. */
7641 build_unary_op (location_t
/*location*/,
7642 enum tree_code code
, tree xarg
, bool noconvert
)
7644 return cp_build_unary_op (code
, xarg
, noconvert
, tf_warning_or_error
);
7647 /* Adjust LVALUE, an MODIFY_EXPR, PREINCREMENT_EXPR or PREDECREMENT_EXPR,
7648 so that it is a valid lvalue even for GENERIC by replacing
7649 (lhs = rhs) with ((lhs = rhs), lhs)
7650 (--lhs) with ((--lhs), lhs)
7651 (++lhs) with ((++lhs), lhs)
7652 and if lhs has side-effects, calling cp_stabilize_reference on it, so
7653 that it can be evaluated multiple times. */
7656 genericize_compound_lvalue (tree lvalue
)
7658 if (TREE_SIDE_EFFECTS (TREE_OPERAND (lvalue
, 0)))
7659 lvalue
= build2 (TREE_CODE (lvalue
), TREE_TYPE (lvalue
),
7660 cp_stabilize_reference (TREE_OPERAND (lvalue
, 0)),
7661 TREE_OPERAND (lvalue
, 1));
7662 return build2 (COMPOUND_EXPR
, TREE_TYPE (TREE_OPERAND (lvalue
, 0)),
7663 lvalue
, TREE_OPERAND (lvalue
, 0));
7666 /* Apply unary lvalue-demanding operator CODE to the expression ARG
7667 for certain kinds of expressions which are not really lvalues
7668 but which we can accept as lvalues.
7670 If ARG is not a kind of expression we can handle, return
7674 unary_complex_lvalue (enum tree_code code
, tree arg
)
7676 /* Inside a template, making these kinds of adjustments is
7677 pointless; we are only concerned with the type of the
7679 if (processing_template_decl
)
7682 /* Handle (a, b) used as an "lvalue". */
7683 if (TREE_CODE (arg
) == COMPOUND_EXPR
)
7685 tree real_result
= cp_build_unary_op (code
, TREE_OPERAND (arg
, 1), false,
7686 tf_warning_or_error
);
7687 return build2 (COMPOUND_EXPR
, TREE_TYPE (real_result
),
7688 TREE_OPERAND (arg
, 0), real_result
);
7691 /* Handle (a ? b : c) used as an "lvalue". */
7692 if (TREE_CODE (arg
) == COND_EXPR
7693 || TREE_CODE (arg
) == MIN_EXPR
|| TREE_CODE (arg
) == MAX_EXPR
)
7694 return rationalize_conditional_expr (code
, arg
, tf_warning_or_error
);
7696 /* Handle (a = b), (++a), and (--a) used as an "lvalue". */
7697 if (TREE_CODE (arg
) == MODIFY_EXPR
7698 || TREE_CODE (arg
) == PREINCREMENT_EXPR
7699 || TREE_CODE (arg
) == PREDECREMENT_EXPR
)
7700 return unary_complex_lvalue (code
, genericize_compound_lvalue (arg
));
7702 if (code
!= ADDR_EXPR
)
7705 /* Handle (a = b) used as an "lvalue" for `&'. */
7706 if (TREE_CODE (arg
) == MODIFY_EXPR
7707 || TREE_CODE (arg
) == INIT_EXPR
)
7709 tree real_result
= cp_build_unary_op (code
, TREE_OPERAND (arg
, 0), false,
7710 tf_warning_or_error
);
7711 arg
= build2 (COMPOUND_EXPR
, TREE_TYPE (real_result
),
7713 suppress_warning (arg
/* What warning? */);
7717 if (FUNC_OR_METHOD_TYPE_P (TREE_TYPE (arg
))
7718 || TREE_CODE (arg
) == OFFSET_REF
)
7721 /* We permit compiler to make function calls returning
7722 objects of aggregate type look like lvalues. */
7726 if (TREE_CODE (targ
) == SAVE_EXPR
)
7727 targ
= TREE_OPERAND (targ
, 0);
7729 if (TREE_CODE (targ
) == CALL_EXPR
&& MAYBE_CLASS_TYPE_P (TREE_TYPE (targ
)))
7731 if (TREE_CODE (arg
) == SAVE_EXPR
)
7734 targ
= build_cplus_new (TREE_TYPE (arg
), arg
, tf_warning_or_error
);
7735 return build1 (ADDR_EXPR
, build_pointer_type (TREE_TYPE (arg
)), targ
);
7738 if (TREE_CODE (arg
) == SAVE_EXPR
&& INDIRECT_REF_P (targ
))
7739 return build3 (SAVE_EXPR
, build_pointer_type (TREE_TYPE (arg
)),
7740 TREE_OPERAND (targ
, 0), current_function_decl
, NULL
);
7743 /* Don't let anything else be handled specially. */
7747 /* Mark EXP saying that we need to be able to take the
7748 address of it; it should not be allocated in a register.
7749 Value is true if successful. ARRAY_REF_P is true if this
7750 is for ARRAY_REF construction - in that case we don't want
7751 to look through VIEW_CONVERT_EXPR from VECTOR_TYPE to ARRAY_TYPE,
7752 it is fine to use ARRAY_REFs for vector subscripts on vector
7755 C++: we do not allow `current_class_ptr' to be addressable. */
7758 cxx_mark_addressable (tree exp
, bool array_ref_p
)
7763 switch (TREE_CODE (x
))
7765 case VIEW_CONVERT_EXPR
:
7767 && TREE_CODE (TREE_TYPE (x
)) == ARRAY_TYPE
7768 && VECTOR_TYPE_P (TREE_TYPE (TREE_OPERAND (x
, 0))))
7770 x
= TREE_OPERAND (x
, 0);
7775 error ("attempt to take address of bit-field");
7781 x
= TREE_OPERAND (x
, 0);
7785 if (x
== current_class_ptr
)
7787 error ("cannot take the address of %<this%>, which is an rvalue expression");
7788 TREE_ADDRESSABLE (x
) = 1; /* so compiler doesn't die later. */
7794 /* Caller should not be trying to mark initialized
7795 constant fields addressable. */
7796 gcc_assert (DECL_LANG_SPECIFIC (x
) == 0
7797 || DECL_IN_AGGR_P (x
) == 0
7799 || DECL_EXTERNAL (x
));
7803 if (DECL_REGISTER (x
) && !TREE_ADDRESSABLE (x
)
7804 && !DECL_ARTIFICIAL (x
))
7806 if (VAR_P (x
) && DECL_HARD_REGISTER (x
))
7809 ("address of explicit register variable %qD requested", x
);
7812 else if (extra_warnings
)
7814 (OPT_Wextra
, "address requested for %qD, which is declared %<register%>", x
);
7816 TREE_ADDRESSABLE (x
) = 1;
7821 TREE_ADDRESSABLE (x
) = 1;
7825 TREE_ADDRESSABLE (x
) = 1;
7829 TREE_ADDRESSABLE (x
) = 1;
7830 cxx_mark_addressable (TREE_OPERAND (x
, 0));
7838 /* Build and return a conditional expression IFEXP ? OP1 : OP2. */
7841 build_x_conditional_expr (location_t loc
, tree ifexp
, tree op1
, tree op2
,
7842 tsubst_flags_t complain
)
7844 tree orig_ifexp
= ifexp
;
7845 tree orig_op1
= op1
;
7846 tree orig_op2
= op2
;
7849 if (processing_template_decl
)
7851 /* The standard says that the expression is type-dependent if
7852 IFEXP is type-dependent, even though the eventual type of the
7853 expression doesn't dependent on IFEXP. */
7854 if (type_dependent_expression_p (ifexp
)
7855 /* As a GNU extension, the middle operand may be omitted. */
7856 || (op1
&& type_dependent_expression_p (op1
))
7857 || type_dependent_expression_p (op2
))
7858 return build_min_nt_loc (loc
, COND_EXPR
, ifexp
, op1
, op2
);
7859 ifexp
= build_non_dependent_expr (ifexp
);
7861 op1
= build_non_dependent_expr (op1
);
7862 op2
= build_non_dependent_expr (op2
);
7865 expr
= build_conditional_expr (loc
, ifexp
, op1
, op2
, complain
);
7866 if (processing_template_decl
&& expr
!= error_mark_node
)
7868 tree min
= build_min_non_dep (COND_EXPR
, expr
,
7869 orig_ifexp
, orig_op1
, orig_op2
);
7870 expr
= convert_from_reference (min
);
7875 /* Given a list of expressions, return a compound expression
7876 that performs them all and returns the value of the last of them. */
7879 build_x_compound_expr_from_list (tree list
, expr_list_kind exp
,
7880 tsubst_flags_t complain
)
7882 tree expr
= TREE_VALUE (list
);
7884 if (BRACE_ENCLOSED_INITIALIZER_P (expr
)
7885 && !CONSTRUCTOR_IS_DIRECT_INIT (expr
))
7887 if (complain
& tf_error
)
7888 pedwarn (cp_expr_loc_or_input_loc (expr
), 0,
7889 "list-initializer for non-class type must not "
7890 "be parenthesized");
7892 return error_mark_node
;
7895 if (TREE_CHAIN (list
))
7897 if (complain
& tf_error
)
7901 permerror (input_location
, "expression list treated as compound "
7902 "expression in initializer");
7905 permerror (input_location
, "expression list treated as compound "
7906 "expression in mem-initializer");
7909 permerror (input_location
, "expression list treated as compound "
7910 "expression in functional cast");
7916 return error_mark_node
;
7918 for (list
= TREE_CHAIN (list
); list
; list
= TREE_CHAIN (list
))
7919 expr
= build_x_compound_expr (EXPR_LOCATION (TREE_VALUE (list
)),
7920 expr
, TREE_VALUE (list
), NULL_TREE
,
7927 /* Like build_x_compound_expr_from_list, but using a VEC. */
7930 build_x_compound_expr_from_vec (vec
<tree
, va_gc
> *vec
, const char *msg
,
7931 tsubst_flags_t complain
)
7933 if (vec_safe_is_empty (vec
))
7935 else if (vec
->length () == 1)
7945 if (complain
& tf_error
)
7946 permerror (input_location
,
7947 "%s expression list treated as compound expression",
7950 return error_mark_node
;
7954 for (ix
= 1; vec
->iterate (ix
, &t
); ++ix
)
7955 expr
= build_x_compound_expr (EXPR_LOCATION (t
), expr
,
7956 t
, NULL_TREE
, complain
);
7962 /* Handle overloading of the ',' operator when needed. */
7965 build_x_compound_expr (location_t loc
, tree op1
, tree op2
,
7966 tree lookups
, tsubst_flags_t complain
)
7969 tree orig_op1
= op1
;
7970 tree orig_op2
= op2
;
7971 tree overload
= NULL_TREE
;
7973 if (processing_template_decl
)
7975 if (type_dependent_expression_p (op1
)
7976 || type_dependent_expression_p (op2
))
7978 result
= build_min_nt_loc (loc
, COMPOUND_EXPR
, op1
, op2
);
7980 = build_dependent_operator_type (lookups
, COMPOUND_EXPR
, false);
7983 op1
= build_non_dependent_expr (op1
);
7984 op2
= build_non_dependent_expr (op2
);
7987 result
= build_new_op (loc
, COMPOUND_EXPR
, LOOKUP_NORMAL
, op1
, op2
,
7988 NULL_TREE
, lookups
, &overload
, complain
);
7990 result
= cp_build_compound_expr (op1
, op2
, complain
);
7992 if (processing_template_decl
&& result
!= error_mark_node
)
7994 if (overload
!= NULL_TREE
)
7995 return (build_min_non_dep_op_overload
7996 (COMPOUND_EXPR
, result
, overload
, orig_op1
, orig_op2
));
7998 return build_min_non_dep (COMPOUND_EXPR
, result
, orig_op1
, orig_op2
);
8004 /* Like cp_build_compound_expr, but for the c-common bits. */
8007 build_compound_expr (location_t
/*loc*/, tree lhs
, tree rhs
)
8009 return cp_build_compound_expr (lhs
, rhs
, tf_warning_or_error
);
8012 /* Build a compound expression. */
8015 cp_build_compound_expr (tree lhs
, tree rhs
, tsubst_flags_t complain
)
8017 lhs
= convert_to_void (lhs
, ICV_LEFT_OF_COMMA
, complain
);
8019 if (lhs
== error_mark_node
|| rhs
== error_mark_node
)
8020 return error_mark_node
;
8022 if (TREE_CODE (lhs
) == EXCESS_PRECISION_EXPR
)
8023 lhs
= TREE_OPERAND (lhs
, 0);
8024 tree eptype
= NULL_TREE
;
8025 if (TREE_CODE (rhs
) == EXCESS_PRECISION_EXPR
)
8027 eptype
= TREE_TYPE (rhs
);
8028 rhs
= TREE_OPERAND (rhs
, 0);
8031 if (TREE_CODE (rhs
) == TARGET_EXPR
)
8033 /* If the rhs is a TARGET_EXPR, then build the compound
8034 expression inside the target_expr's initializer. This
8035 helps the compiler to eliminate unnecessary temporaries. */
8036 tree init
= TREE_OPERAND (rhs
, 1);
8038 init
= build2 (COMPOUND_EXPR
, TREE_TYPE (init
), lhs
, init
);
8039 TREE_OPERAND (rhs
, 1) = init
;
8042 rhs
= build1 (EXCESS_PRECISION_EXPR
, eptype
, rhs
);
8046 if (type_unknown_p (rhs
))
8048 if (complain
& tf_error
)
8049 error_at (cp_expr_loc_or_input_loc (rhs
),
8050 "no context to resolve type of %qE", rhs
);
8051 return error_mark_node
;
8054 tree ret
= build2 (COMPOUND_EXPR
, TREE_TYPE (rhs
), lhs
, rhs
);
8056 ret
= build1 (EXCESS_PRECISION_EXPR
, eptype
, ret
);
8060 /* Issue a diagnostic message if casting from SRC_TYPE to DEST_TYPE
8061 casts away constness. CAST gives the type of cast. Returns true
8062 if the cast is ill-formed, false if it is well-formed.
8064 ??? This function warns for casting away any qualifier not just
8065 const. We would like to specify exactly what qualifiers are casted
8070 check_for_casting_away_constness (location_t loc
, tree src_type
,
8071 tree dest_type
, enum tree_code cast
,
8072 tsubst_flags_t complain
)
8074 /* C-style casts are allowed to cast away constness. With
8075 WARN_CAST_QUAL, we still want to issue a warning. */
8076 if (cast
== CAST_EXPR
&& !warn_cast_qual
)
8079 if (!casts_away_constness (src_type
, dest_type
, complain
))
8085 if (complain
& tf_warning
)
8086 warning_at (loc
, OPT_Wcast_qual
,
8087 "cast from type %qT to type %qT casts away qualifiers",
8088 src_type
, dest_type
);
8091 case STATIC_CAST_EXPR
:
8092 if (complain
& tf_error
)
8093 error_at (loc
, "%<static_cast%> from type %qT to type %qT casts "
8095 src_type
, dest_type
);
8098 case REINTERPRET_CAST_EXPR
:
8099 if (complain
& tf_error
)
8100 error_at (loc
, "%<reinterpret_cast%> from type %qT to type %qT "
8101 "casts away qualifiers",
8102 src_type
, dest_type
);
8110 /* Warns if the cast from expression EXPR to type TYPE is useless. */
8112 maybe_warn_about_useless_cast (location_t loc
, tree type
, tree expr
,
8113 tsubst_flags_t complain
)
8115 if (warn_useless_cast
8116 && complain
& tf_warning
)
8118 if (TYPE_REF_P (type
)
8119 ? ((TYPE_REF_IS_RVALUE (type
)
8120 ? xvalue_p (expr
) : lvalue_p (expr
))
8121 && same_type_p (TREE_TYPE (expr
), TREE_TYPE (type
)))
8122 /* Don't warn when converting a class object to a non-reference type,
8123 because that's a common way to create a temporary. */
8124 : (!glvalue_p (expr
) && same_type_p (TREE_TYPE (expr
), type
)))
8125 warning_at (loc
, OPT_Wuseless_cast
,
8126 "useless cast to type %q#T", type
);
8130 /* Warns if the cast ignores cv-qualifiers on TYPE. */
8132 maybe_warn_about_cast_ignoring_quals (location_t loc
, tree type
,
8133 tsubst_flags_t complain
)
8135 if (warn_ignored_qualifiers
8136 && complain
& tf_warning
8137 && !CLASS_TYPE_P (type
)
8138 && (cp_type_quals (type
) & (TYPE_QUAL_CONST
|TYPE_QUAL_VOLATILE
)))
8139 warning_at (loc
, OPT_Wignored_qualifiers
,
8140 "type qualifiers ignored on cast result type");
8143 /* Convert EXPR (an expression with pointer-to-member type) to TYPE
8144 (another pointer-to-member type in the same hierarchy) and return
8145 the converted expression. If ALLOW_INVERSE_P is permitted, a
8146 pointer-to-derived may be converted to pointer-to-base; otherwise,
8147 only the other direction is permitted. If C_CAST_P is true, this
8148 conversion is taking place as part of a C-style cast. */
8151 convert_ptrmem (tree type
, tree expr
, bool allow_inverse_p
,
8152 bool c_cast_p
, tsubst_flags_t complain
)
8154 if (same_type_p (type
, TREE_TYPE (expr
)))
8157 if (TYPE_PTRDATAMEM_P (type
))
8159 tree obase
= TYPE_PTRMEM_CLASS_TYPE (TREE_TYPE (expr
));
8160 tree nbase
= TYPE_PTRMEM_CLASS_TYPE (type
);
8161 tree delta
= (get_delta_difference
8163 allow_inverse_p
, c_cast_p
, complain
));
8165 if (delta
== error_mark_node
)
8166 return error_mark_node
;
8168 if (!same_type_p (obase
, nbase
))
8170 if (TREE_CODE (expr
) == PTRMEM_CST
)
8171 expr
= cplus_expand_constant (expr
);
8173 tree cond
= cp_build_binary_op (input_location
, EQ_EXPR
, expr
,
8174 build_int_cst (TREE_TYPE (expr
), -1),
8176 tree op1
= build_nop (ptrdiff_type_node
, expr
);
8177 tree op2
= cp_build_binary_op (input_location
, PLUS_EXPR
, op1
, delta
,
8180 expr
= fold_build3_loc (input_location
,
8181 COND_EXPR
, ptrdiff_type_node
, cond
, op1
, op2
);
8184 return build_nop (type
, expr
);
8187 return build_ptrmemfunc (TYPE_PTRMEMFUNC_FN_TYPE (type
), expr
,
8188 allow_inverse_p
, c_cast_p
, complain
);
8191 /* Perform a static_cast from EXPR to TYPE. When C_CAST_P is true,
8192 this static_cast is being attempted as one of the possible casts
8193 allowed by a C-style cast. (In that case, accessibility of base
8194 classes is not considered, and it is OK to cast away
8195 constness.) Return the result of the cast. *VALID_P is set to
8196 indicate whether or not the cast was valid. */
8199 build_static_cast_1 (location_t loc
, tree type
, tree expr
, bool c_cast_p
,
8200 bool *valid_p
, tsubst_flags_t complain
)
8206 /* Assume the cast is valid. */
8209 intype
= unlowered_expr_type (expr
);
8211 /* Save casted types in the function's used types hash table. */
8212 used_types_insert (type
);
8214 /* A prvalue of non-class type is cv-unqualified. */
8215 if (!CLASS_TYPE_P (type
))
8216 type
= cv_unqualified (type
);
8218 /* [expr.static.cast]
8220 An lvalue of type "cv1 B", where B is a class type, can be cast
8221 to type "reference to cv2 D", where D is a class derived (clause
8222 _class.derived_) from B, if a valid standard conversion from
8223 "pointer to D" to "pointer to B" exists (_conv.ptr_), cv2 is the
8224 same cv-qualification as, or greater cv-qualification than, cv1,
8225 and B is not a virtual base class of D. */
8226 /* We check this case before checking the validity of "TYPE t =
8227 EXPR;" below because for this case:
8230 struct D : public B { D(const B&); };
8232 void f() { static_cast<const D&>(b); }
8234 we want to avoid constructing a new D. The standard is not
8235 completely clear about this issue, but our interpretation is
8236 consistent with other compilers. */
8237 if (TYPE_REF_P (type
)
8238 && CLASS_TYPE_P (TREE_TYPE (type
))
8239 && CLASS_TYPE_P (intype
)
8240 && (TYPE_REF_IS_RVALUE (type
) || lvalue_p (expr
))
8241 && DERIVED_FROM_P (intype
, TREE_TYPE (type
))
8242 && can_convert (build_pointer_type (TYPE_MAIN_VARIANT (intype
)),
8243 build_pointer_type (TYPE_MAIN_VARIANT
8244 (TREE_TYPE (type
))),
8247 || at_least_as_qualified_p (TREE_TYPE (type
), intype
)))
8251 if (processing_template_decl
)
8254 /* There is a standard conversion from "D*" to "B*" even if "B"
8255 is ambiguous or inaccessible. If this is really a
8256 static_cast, then we check both for inaccessibility and
8257 ambiguity. However, if this is a static_cast being performed
8258 because the user wrote a C-style cast, then accessibility is
8260 base
= lookup_base (TREE_TYPE (type
), intype
,
8261 c_cast_p
? ba_unique
: ba_check
,
8263 expr
= cp_build_addr_expr (expr
, complain
);
8265 if (sanitize_flags_p (SANITIZE_VPTR
))
8268 = cp_ubsan_maybe_instrument_downcast (loc
, type
,
8274 /* Convert from "B*" to "D*". This function will check that "B"
8275 is not a virtual base of "D". Even if we don't have a guarantee
8276 that expr is NULL, if the static_cast is to a reference type,
8277 it is UB if it would be NULL, so omit the non-NULL check. */
8278 expr
= build_base_path (MINUS_EXPR
, expr
, base
,
8279 /*nonnull=*/flag_delete_null_pointer_checks
,
8282 /* Convert the pointer to a reference -- but then remember that
8283 there are no expressions with reference type in C++.
8285 We call rvalue so that there's an actual tree code
8286 (NON_LVALUE_EXPR) for the static_cast; otherwise, if the operand
8287 is a variable with the same type, the conversion would get folded
8288 away, leaving just the variable and causing lvalue_kind to give
8289 the wrong answer. */
8290 expr
= cp_fold_convert (type
, expr
);
8292 /* When -fsanitize=null, make sure to diagnose reference binding to
8293 NULL even when the reference is converted to pointer later on. */
8294 if (sanitize_flags_p (SANITIZE_NULL
)
8295 && TREE_CODE (expr
) == COND_EXPR
8296 && TREE_OPERAND (expr
, 2)
8297 && TREE_CODE (TREE_OPERAND (expr
, 2)) == INTEGER_CST
8298 && TREE_TYPE (TREE_OPERAND (expr
, 2)) == type
)
8299 ubsan_maybe_instrument_reference (&TREE_OPERAND (expr
, 2));
8301 return convert_from_reference (rvalue (expr
));
8304 /* "A glvalue of type cv1 T1 can be cast to type rvalue reference to
8305 cv2 T2 if cv2 T2 is reference-compatible with cv1 T1 (8.5.3)." */
8306 if (TYPE_REF_P (type
)
8307 && TYPE_REF_IS_RVALUE (type
)
8308 && (clk
= real_lvalue_p (expr
))
8309 && reference_compatible_p (TREE_TYPE (type
), intype
)
8310 && (c_cast_p
|| at_least_as_qualified_p (TREE_TYPE (type
), intype
)))
8312 if (processing_template_decl
)
8314 if (clk
== clk_ordinary
)
8316 /* Handle the (non-bit-field) lvalue case here by casting to
8317 lvalue reference and then changing it to an rvalue reference.
8318 Casting an xvalue to rvalue reference will be handled by the
8320 tree lref
= cp_build_reference_type (TREE_TYPE (type
), false);
8321 result
= (perform_direct_initialization_if_possible
8322 (lref
, expr
, c_cast_p
, complain
));
8323 result
= build1 (NON_LVALUE_EXPR
, type
, result
);
8324 return convert_from_reference (result
);
8327 /* For a bit-field or packed field, bind to a temporary. */
8328 expr
= rvalue (expr
);
8331 /* Resolve overloaded address here rather than once in
8332 implicit_conversion and again in the inverse code below. */
8333 if (TYPE_PTRMEMFUNC_P (type
) && type_unknown_p (expr
))
8335 expr
= instantiate_type (type
, expr
, complain
);
8336 intype
= TREE_TYPE (expr
);
8339 /* [expr.static.cast]
8341 Any expression can be explicitly converted to type cv void. */
8342 if (VOID_TYPE_P (type
))
8344 if (TREE_CODE (expr
) == EXCESS_PRECISION_EXPR
)
8345 expr
= TREE_OPERAND (expr
, 0);
8346 return convert_to_void (expr
, ICV_CAST
, complain
);
8350 An abstract class shall not be used ... as the type of an explicit
8352 if (abstract_virtuals_error (ACU_CAST
, type
, complain
))
8353 return error_mark_node
;
8355 /* [expr.static.cast]
8357 An expression e can be explicitly converted to a type T using a
8358 static_cast of the form static_cast<T>(e) if the declaration T
8359 t(e);" is well-formed, for some invented temporary variable
8361 result
= perform_direct_initialization_if_possible (type
, expr
,
8362 c_cast_p
, complain
);
8363 /* P1975 allows static_cast<Aggr>(42), as well as static_cast<T[5]>(42),
8364 which initialize the first element of the aggregate. We need to handle
8365 the array case specifically. */
8366 if (result
== NULL_TREE
8367 && cxx_dialect
>= cxx20
8368 && TREE_CODE (type
) == ARRAY_TYPE
)
8370 /* Create { EXPR } and perform direct-initialization from it. */
8371 tree e
= build_constructor_single (init_list_type_node
, NULL_TREE
, expr
);
8372 CONSTRUCTOR_IS_DIRECT_INIT (e
) = true;
8373 CONSTRUCTOR_IS_PAREN_INIT (e
) = true;
8374 result
= perform_direct_initialization_if_possible (type
, e
, c_cast_p
,
8379 if (processing_template_decl
)
8382 result
= convert_from_reference (result
);
8384 /* [expr.static.cast]
8386 If T is a reference type, the result is an lvalue; otherwise,
8387 the result is an rvalue. */
8388 if (!TYPE_REF_P (type
))
8390 result
= rvalue (result
);
8392 if (result
== expr
&& SCALAR_TYPE_P (type
))
8393 /* Leave some record of the cast. */
8394 result
= build_nop (type
, expr
);
8399 /* [expr.static.cast]
8401 The inverse of any standard conversion sequence (clause _conv_),
8402 other than the lvalue-to-rvalue (_conv.lval_), array-to-pointer
8403 (_conv.array_), function-to-pointer (_conv.func_), and boolean
8404 (_conv.bool_) conversions, can be performed explicitly using
8405 static_cast subject to the restriction that the explicit
8406 conversion does not cast away constness (_expr.const.cast_), and
8407 the following additional rules for specific cases: */
8408 /* For reference, the conversions not excluded are: integral
8409 promotions, floating-point promotion, integral conversions,
8410 floating-point conversions, floating-integral conversions,
8411 pointer conversions, and pointer to member conversions. */
8414 A value of integral _or enumeration_ type can be explicitly
8415 converted to an enumeration type. */
8416 /* The effect of all that is that any conversion between any two
8417 types which are integral, floating, or enumeration types can be
8419 if ((INTEGRAL_OR_ENUMERATION_TYPE_P (type
)
8420 || SCALAR_FLOAT_TYPE_P (type
))
8421 && (INTEGRAL_OR_ENUMERATION_TYPE_P (intype
)
8422 || SCALAR_FLOAT_TYPE_P (intype
)))
8424 if (processing_template_decl
)
8426 if (TREE_CODE (expr
) == EXCESS_PRECISION_EXPR
)
8427 expr
= TREE_OPERAND (expr
, 0);
8428 return ocp_convert (type
, expr
, CONV_C_CAST
, LOOKUP_NORMAL
, complain
);
8431 if (TYPE_PTR_P (type
) && TYPE_PTR_P (intype
)
8432 && CLASS_TYPE_P (TREE_TYPE (type
))
8433 && CLASS_TYPE_P (TREE_TYPE (intype
))
8434 && can_convert (build_pointer_type (TYPE_MAIN_VARIANT
8435 (TREE_TYPE (intype
))),
8436 build_pointer_type (TYPE_MAIN_VARIANT
8437 (TREE_TYPE (type
))),
8442 if (processing_template_decl
)
8446 && check_for_casting_away_constness (loc
, intype
, type
,
8449 return error_mark_node
;
8450 base
= lookup_base (TREE_TYPE (type
), TREE_TYPE (intype
),
8451 c_cast_p
? ba_unique
: ba_check
,
8453 expr
= build_base_path (MINUS_EXPR
, expr
, base
, /*nonnull=*/false,
8456 if (sanitize_flags_p (SANITIZE_VPTR
))
8459 = cp_ubsan_maybe_instrument_downcast (loc
, type
,
8465 return cp_fold_convert (type
, expr
);
8468 if ((TYPE_PTRDATAMEM_P (type
) && TYPE_PTRDATAMEM_P (intype
))
8469 || (TYPE_PTRMEMFUNC_P (type
) && TYPE_PTRMEMFUNC_P (intype
)))
8476 c1
= TYPE_PTRMEM_CLASS_TYPE (intype
);
8477 c2
= TYPE_PTRMEM_CLASS_TYPE (type
);
8479 if (TYPE_PTRDATAMEM_P (type
))
8481 t1
= (build_ptrmem_type
8483 TYPE_MAIN_VARIANT (TYPE_PTRMEM_POINTED_TO_TYPE (intype
))));
8484 t2
= (build_ptrmem_type
8486 TYPE_MAIN_VARIANT (TYPE_PTRMEM_POINTED_TO_TYPE (type
))));
8493 if (can_convert (t1
, t2
, complain
) || can_convert (t2
, t1
, complain
))
8496 && check_for_casting_away_constness (loc
, intype
, type
,
8499 return error_mark_node
;
8500 if (processing_template_decl
)
8502 return convert_ptrmem (type
, expr
, /*allow_inverse_p=*/1,
8503 c_cast_p
, complain
);
8507 /* [expr.static.cast]
8509 An rvalue of type "pointer to cv void" can be explicitly
8510 converted to a pointer to object type. A value of type pointer
8511 to object converted to "pointer to cv void" and back to the
8512 original pointer type will have its original value. */
8513 if (TYPE_PTR_P (intype
)
8514 && VOID_TYPE_P (TREE_TYPE (intype
))
8515 && TYPE_PTROB_P (type
))
8518 && check_for_casting_away_constness (loc
, intype
, type
,
8521 return error_mark_node
;
8522 if (processing_template_decl
)
8524 return build_nop (type
, expr
);
8528 return error_mark_node
;
8531 /* Return an expression representing static_cast<TYPE>(EXPR). */
8534 build_static_cast (location_t loc
, tree type
, tree oexpr
,
8535 tsubst_flags_t complain
)
8541 if (type
== error_mark_node
|| expr
== error_mark_node
)
8542 return error_mark_node
;
8544 bool dependent
= (dependent_type_p (type
)
8545 || type_dependent_expression_p (expr
));
8549 expr
= build_min (STATIC_CAST_EXPR
, type
, oexpr
);
8550 /* We don't know if it will or will not have side effects. */
8551 TREE_SIDE_EFFECTS (expr
) = 1;
8552 result
= convert_from_reference (expr
);
8553 protected_set_expr_location (result
, loc
);
8556 else if (processing_template_decl
)
8557 expr
= build_non_dependent_expr (expr
);
8559 /* build_c_cast puts on a NOP_EXPR to make the result not an lvalue.
8560 Strip such NOP_EXPRs if VALUE is being used in non-lvalue context. */
8561 if (!TYPE_REF_P (type
)
8562 && TREE_CODE (expr
) == NOP_EXPR
8563 && TREE_TYPE (expr
) == TREE_TYPE (TREE_OPERAND (expr
, 0)))
8564 expr
= TREE_OPERAND (expr
, 0);
8566 result
= build_static_cast_1 (loc
, type
, expr
, /*c_cast_p=*/false,
8567 &valid_p
, complain
);
8570 if (result
!= error_mark_node
)
8572 maybe_warn_about_useless_cast (loc
, type
, expr
, complain
);
8573 maybe_warn_about_cast_ignoring_quals (loc
, type
, complain
);
8575 if (processing_template_decl
)
8577 protected_set_expr_location (result
, loc
);
8581 if (complain
& tf_error
)
8583 error_at (loc
, "invalid %<static_cast%> from type %qT to type %qT",
8584 TREE_TYPE (expr
), type
);
8585 if ((TYPE_PTR_P (type
) || TYPE_REF_P (type
))
8586 && CLASS_TYPE_P (TREE_TYPE (type
))
8587 && !COMPLETE_TYPE_P (TREE_TYPE (type
)))
8588 inform (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (TREE_TYPE (type
))),
8589 "class type %qT is incomplete", TREE_TYPE (type
));
8590 tree expr_type
= TREE_TYPE (expr
);
8591 if (TYPE_PTR_P (expr_type
))
8592 expr_type
= TREE_TYPE (expr_type
);
8593 if (CLASS_TYPE_P (expr_type
) && !COMPLETE_TYPE_P (expr_type
))
8594 inform (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (expr_type
)),
8595 "class type %qT is incomplete", expr_type
);
8597 return error_mark_node
;
8600 /* EXPR is an expression with member function or pointer-to-member
8601 function type. TYPE is a pointer type. Converting EXPR to TYPE is
8602 not permitted by ISO C++, but we accept it in some modes. If we
8603 are not in one of those modes, issue a diagnostic. Return the
8604 converted expression. */
8607 convert_member_func_to_ptr (tree type
, tree expr
, tsubst_flags_t complain
)
8612 intype
= TREE_TYPE (expr
);
8613 gcc_assert (TYPE_PTRMEMFUNC_P (intype
)
8614 || TREE_CODE (intype
) == METHOD_TYPE
);
8616 if (!(complain
& tf_warning_or_error
))
8617 return error_mark_node
;
8619 location_t loc
= cp_expr_loc_or_input_loc (expr
);
8621 if (pedantic
|| warn_pmf2ptr
)
8622 pedwarn (loc
, pedantic
? OPT_Wpedantic
: OPT_Wpmf_conversions
,
8623 "converting from %qH to %qI", intype
, type
);
8625 STRIP_ANY_LOCATION_WRAPPER (expr
);
8627 if (TREE_CODE (intype
) == METHOD_TYPE
)
8628 expr
= build_addr_func (expr
, complain
);
8629 else if (TREE_CODE (expr
) == PTRMEM_CST
)
8630 expr
= build_address (PTRMEM_CST_MEMBER (expr
));
8633 decl
= maybe_dummy_object (TYPE_PTRMEM_CLASS_TYPE (intype
), 0);
8634 decl
= build_address (decl
);
8635 expr
= get_member_function_from_ptrfunc (&decl
, expr
, complain
);
8638 if (expr
== error_mark_node
)
8639 return error_mark_node
;
8641 expr
= build_nop (type
, expr
);
8642 SET_EXPR_LOCATION (expr
, loc
);
8646 /* Build a NOP_EXPR to TYPE, but mark it as a reinterpret_cast so that
8647 constexpr evaluation knows to reject it. */
8650 build_nop_reinterpret (tree type
, tree expr
)
8652 tree ret
= build_nop (type
, expr
);
8654 REINTERPRET_CAST_P (ret
) = true;
8658 /* Return a representation for a reinterpret_cast from EXPR to TYPE.
8659 If C_CAST_P is true, this reinterpret cast is being done as part of
8660 a C-style cast. If VALID_P is non-NULL, *VALID_P is set to
8661 indicate whether or not reinterpret_cast was valid. */
8664 build_reinterpret_cast_1 (location_t loc
, tree type
, tree expr
,
8665 bool c_cast_p
, bool *valid_p
,
8666 tsubst_flags_t complain
)
8670 /* Assume the cast is invalid. */
8674 if (type
== error_mark_node
|| error_operand_p (expr
))
8675 return error_mark_node
;
8677 intype
= TREE_TYPE (expr
);
8679 /* Save casted types in the function's used types hash table. */
8680 used_types_insert (type
);
8682 /* A prvalue of non-class type is cv-unqualified. */
8683 if (!CLASS_TYPE_P (type
))
8684 type
= cv_unqualified (type
);
8686 /* [expr.reinterpret.cast]
8687 A glvalue of type T1, designating an object x, can be cast to the type
8688 "reference to T2" if an expression of type "pointer to T1" can be
8689 explicitly converted to the type "pointer to T2" using a reinterpret_cast.
8690 The result is that of *reinterpret_cast<T2 *>(p) where p is a pointer to x
8691 of type "pointer to T1". No temporary is created, no copy is made, and no
8692 constructors (11.4.4) or conversion functions (11.4.7) are called. */
8693 if (TYPE_REF_P (type
))
8695 if (!glvalue_p (expr
))
8697 if (complain
& tf_error
)
8698 error_at (loc
, "invalid cast of a prvalue expression of type "
8701 return error_mark_node
;
8704 /* Warn about a reinterpret_cast from "A*" to "B&" if "A" and
8705 "B" are related class types; the reinterpret_cast does not
8706 adjust the pointer. */
8707 if (TYPE_PTR_P (intype
)
8708 && (complain
& tf_warning
)
8709 && (comptypes (TREE_TYPE (intype
), TREE_TYPE (type
),
8710 COMPARE_BASE
| COMPARE_DERIVED
)))
8711 warning_at (loc
, 0, "casting %qT to %qT does not dereference pointer",
8714 expr
= cp_build_addr_expr (expr
, complain
);
8716 if (warn_strict_aliasing
> 2)
8717 cp_strict_aliasing_warning (EXPR_LOCATION (expr
), type
, expr
);
8719 if (expr
!= error_mark_node
)
8720 expr
= build_reinterpret_cast_1
8721 (loc
, build_pointer_type (TREE_TYPE (type
)), expr
, c_cast_p
,
8723 if (expr
!= error_mark_node
)
8724 /* cp_build_indirect_ref isn't right for rvalue refs. */
8725 expr
= convert_from_reference (fold_convert (type
, expr
));
8729 /* As a G++ extension, we consider conversions from member
8730 functions, and pointers to member functions to
8731 pointer-to-function and pointer-to-void types. If
8732 -Wno-pmf-conversions has not been specified,
8733 convert_member_func_to_ptr will issue an error message. */
8734 if ((TYPE_PTRMEMFUNC_P (intype
)
8735 || TREE_CODE (intype
) == METHOD_TYPE
)
8736 && TYPE_PTR_P (type
)
8737 && (TREE_CODE (TREE_TYPE (type
)) == FUNCTION_TYPE
8738 || VOID_TYPE_P (TREE_TYPE (type
))))
8739 return convert_member_func_to_ptr (type
, expr
, complain
);
8741 /* If the cast is not to a reference type, the lvalue-to-rvalue,
8742 array-to-pointer, and function-to-pointer conversions are
8744 expr
= decay_conversion (expr
, complain
);
8746 /* build_c_cast puts on a NOP_EXPR to make the result not an lvalue.
8747 Strip such NOP_EXPRs if VALUE is being used in non-lvalue context. */
8748 if (TREE_CODE (expr
) == NOP_EXPR
8749 && TREE_TYPE (expr
) == TREE_TYPE (TREE_OPERAND (expr
, 0)))
8750 expr
= TREE_OPERAND (expr
, 0);
8752 if (error_operand_p (expr
))
8753 return error_mark_node
;
8755 intype
= TREE_TYPE (expr
);
8757 /* [expr.reinterpret.cast]
8758 A pointer can be converted to any integral type large enough to
8759 hold it. ... A value of type std::nullptr_t can be converted to
8760 an integral type; the conversion has the same meaning and
8761 validity as a conversion of (void*)0 to the integral type. */
8762 if (CP_INTEGRAL_TYPE_P (type
)
8763 && (TYPE_PTR_P (intype
) || NULLPTR_TYPE_P (intype
)))
8765 if (TYPE_PRECISION (type
) < TYPE_PRECISION (intype
))
8767 if (complain
& tf_error
)
8768 permerror (loc
, "cast from %qH to %qI loses precision",
8771 return error_mark_node
;
8773 if (NULLPTR_TYPE_P (intype
))
8774 return build_int_cst (type
, 0);
8776 /* [expr.reinterpret.cast]
8777 A value of integral or enumeration type can be explicitly
8778 converted to a pointer. */
8779 else if (TYPE_PTR_P (type
) && INTEGRAL_OR_ENUMERATION_TYPE_P (intype
))
8782 else if ((INTEGRAL_OR_ENUMERATION_TYPE_P (type
)
8783 || TYPE_PTR_OR_PTRMEM_P (type
))
8784 && same_type_p (type
, intype
))
8786 return rvalue (expr
);
8787 else if (TYPE_PTRFN_P (type
) && TYPE_PTRFN_P (intype
))
8789 if ((complain
& tf_warning
)
8790 && !cxx_safe_function_type_cast_p (TREE_TYPE (type
),
8791 TREE_TYPE (intype
)))
8792 warning_at (loc
, OPT_Wcast_function_type
,
8793 "cast between incompatible function types"
8794 " from %qH to %qI", intype
, type
);
8795 return build_nop_reinterpret (type
, expr
);
8797 else if (TYPE_PTRMEMFUNC_P (type
) && TYPE_PTRMEMFUNC_P (intype
))
8799 if ((complain
& tf_warning
)
8800 && !cxx_safe_function_type_cast_p
8801 (TREE_TYPE (TYPE_PTRMEMFUNC_FN_TYPE_RAW (type
)),
8802 TREE_TYPE (TYPE_PTRMEMFUNC_FN_TYPE_RAW (intype
))))
8803 warning_at (loc
, OPT_Wcast_function_type
,
8804 "cast between incompatible pointer to member types"
8805 " from %qH to %qI", intype
, type
);
8806 return build_nop_reinterpret (type
, expr
);
8808 else if ((TYPE_PTRDATAMEM_P (type
) && TYPE_PTRDATAMEM_P (intype
))
8809 || (TYPE_PTROBV_P (type
) && TYPE_PTROBV_P (intype
)))
8812 && check_for_casting_away_constness (loc
, intype
, type
,
8813 REINTERPRET_CAST_EXPR
,
8815 return error_mark_node
;
8816 /* Warn about possible alignment problems. */
8817 if ((STRICT_ALIGNMENT
|| warn_cast_align
== 2)
8818 && (complain
& tf_warning
)
8819 && !VOID_TYPE_P (type
)
8820 && TREE_CODE (TREE_TYPE (intype
)) != FUNCTION_TYPE
8821 && COMPLETE_TYPE_P (TREE_TYPE (type
))
8822 && COMPLETE_TYPE_P (TREE_TYPE (intype
))
8823 && min_align_of_type (TREE_TYPE (type
))
8824 > min_align_of_type (TREE_TYPE (intype
)))
8825 warning_at (loc
, OPT_Wcast_align
, "cast from %qH to %qI "
8826 "increases required alignment of target type",
8829 if (warn_strict_aliasing
<= 2)
8830 /* strict_aliasing_warning STRIP_NOPs its expr. */
8831 cp_strict_aliasing_warning (EXPR_LOCATION (expr
), type
, expr
);
8833 return build_nop_reinterpret (type
, expr
);
8835 else if ((TYPE_PTRFN_P (type
) && TYPE_PTROBV_P (intype
))
8836 || (TYPE_PTRFN_P (intype
) && TYPE_PTROBV_P (type
)))
8838 if (complain
& tf_warning
)
8839 /* C++11 5.2.10 p8 says that "Converting a function pointer to an
8840 object pointer type or vice versa is conditionally-supported." */
8841 warning_at (loc
, OPT_Wconditionally_supported
,
8842 "casting between pointer-to-function and "
8843 "pointer-to-object is conditionally-supported");
8844 return build_nop_reinterpret (type
, expr
);
8846 else if (gnu_vector_type_p (type
) && scalarish_type_p (intype
))
8847 return convert_to_vector (type
, rvalue (expr
));
8848 else if (gnu_vector_type_p (intype
)
8849 && INTEGRAL_OR_ENUMERATION_TYPE_P (type
))
8850 return convert_to_integer_nofold (type
, expr
);
8855 if (complain
& tf_error
)
8856 error_at (loc
, "invalid cast from type %qT to type %qT",
8858 return error_mark_node
;
8861 expr
= cp_convert (type
, expr
, complain
);
8862 if (TREE_CODE (expr
) == NOP_EXPR
)
8863 /* Mark any nop_expr that created as a reintepret_cast. */
8864 REINTERPRET_CAST_P (expr
) = true;
8869 build_reinterpret_cast (location_t loc
, tree type
, tree expr
,
8870 tsubst_flags_t complain
)
8874 if (type
== error_mark_node
|| expr
== error_mark_node
)
8875 return error_mark_node
;
8877 if (processing_template_decl
)
8879 tree t
= build_min (REINTERPRET_CAST_EXPR
, type
, expr
);
8881 if (!TREE_SIDE_EFFECTS (t
)
8882 && type_dependent_expression_p (expr
))
8883 /* There might turn out to be side effects inside expr. */
8884 TREE_SIDE_EFFECTS (t
) = 1;
8885 r
= convert_from_reference (t
);
8886 protected_set_expr_location (r
, loc
);
8890 r
= build_reinterpret_cast_1 (loc
, type
, expr
, /*c_cast_p=*/false,
8891 /*valid_p=*/NULL
, complain
);
8892 if (r
!= error_mark_node
)
8894 maybe_warn_about_useless_cast (loc
, type
, expr
, complain
);
8895 maybe_warn_about_cast_ignoring_quals (loc
, type
, complain
);
8897 protected_set_expr_location (r
, loc
);
8901 /* Perform a const_cast from EXPR to TYPE. If the cast is valid,
8902 return an appropriate expression. Otherwise, return
8903 error_mark_node. If the cast is not valid, and COMPLAIN is true,
8904 then a diagnostic will be issued. If VALID_P is non-NULL, we are
8905 performing a C-style cast, its value upon return will indicate
8906 whether or not the conversion succeeded. */
8909 build_const_cast_1 (location_t loc
, tree dst_type
, tree expr
,
8910 tsubst_flags_t complain
, bool *valid_p
)
8913 tree reference_type
;
8915 /* Callers are responsible for handling error_mark_node as a
8916 destination type. */
8917 gcc_assert (dst_type
!= error_mark_node
);
8918 /* In a template, callers should be building syntactic
8919 representations of casts, not using this machinery. */
8920 gcc_assert (!processing_template_decl
);
8922 /* Assume the conversion is invalid. */
8926 if (!INDIRECT_TYPE_P (dst_type
) && !TYPE_PTRDATAMEM_P (dst_type
))
8928 if (complain
& tf_error
)
8929 error_at (loc
, "invalid use of %<const_cast%> with type %qT, "
8930 "which is not a pointer, reference, "
8931 "nor a pointer-to-data-member type", dst_type
);
8932 return error_mark_node
;
8935 if (TREE_CODE (TREE_TYPE (dst_type
)) == FUNCTION_TYPE
)
8937 if (complain
& tf_error
)
8938 error_at (loc
, "invalid use of %<const_cast%> with type %qT, "
8939 "which is a pointer or reference to a function type",
8941 return error_mark_node
;
8944 /* A prvalue of non-class type is cv-unqualified. */
8945 dst_type
= cv_unqualified (dst_type
);
8947 /* Save casted types in the function's used types hash table. */
8948 used_types_insert (dst_type
);
8950 src_type
= TREE_TYPE (expr
);
8951 /* Expressions do not really have reference types. */
8952 if (TYPE_REF_P (src_type
))
8953 src_type
= TREE_TYPE (src_type
);
8955 /* [expr.const.cast]
8957 For two object types T1 and T2, if a pointer to T1 can be explicitly
8958 converted to the type "pointer to T2" using a const_cast, then the
8959 following conversions can also be made:
8961 -- an lvalue of type T1 can be explicitly converted to an lvalue of
8962 type T2 using the cast const_cast<T2&>;
8964 -- a glvalue of type T1 can be explicitly converted to an xvalue of
8965 type T2 using the cast const_cast<T2&&>; and
8967 -- if T1 is a class type, a prvalue of type T1 can be explicitly
8968 converted to an xvalue of type T2 using the cast const_cast<T2&&>. */
8970 if (TYPE_REF_P (dst_type
))
8972 reference_type
= dst_type
;
8973 if (!TYPE_REF_IS_RVALUE (dst_type
)
8979 if (complain
& tf_error
)
8980 error_at (loc
, "invalid %<const_cast%> of an rvalue of type %qT "
8982 src_type
, dst_type
);
8983 return error_mark_node
;
8985 dst_type
= build_pointer_type (TREE_TYPE (dst_type
));
8986 src_type
= build_pointer_type (src_type
);
8990 reference_type
= NULL_TREE
;
8991 /* If the destination type is not a reference type, the
8992 lvalue-to-rvalue, array-to-pointer, and function-to-pointer
8993 conversions are performed. */
8994 src_type
= type_decays_to (src_type
);
8995 if (src_type
== error_mark_node
)
8996 return error_mark_node
;
8999 if (TYPE_PTR_P (src_type
) || TYPE_PTRDATAMEM_P (src_type
))
9001 if (comp_ptr_ttypes_const (dst_type
, src_type
, bounds_none
))
9006 /* This cast is actually a C-style cast. Issue a warning if
9007 the user is making a potentially unsafe cast. */
9008 check_for_casting_away_constness (loc
, src_type
, dst_type
,
9009 CAST_EXPR
, complain
);
9010 /* ??? comp_ptr_ttypes_const ignores TYPE_ALIGN. */
9011 if ((STRICT_ALIGNMENT
|| warn_cast_align
== 2)
9012 && (complain
& tf_warning
)
9013 && min_align_of_type (TREE_TYPE (dst_type
))
9014 > min_align_of_type (TREE_TYPE (src_type
)))
9015 warning_at (loc
, OPT_Wcast_align
, "cast from %qH to %qI "
9016 "increases required alignment of target type",
9017 src_type
, dst_type
);
9021 expr
= cp_build_addr_expr (expr
, complain
);
9022 if (expr
== error_mark_node
)
9023 return error_mark_node
;
9024 expr
= build_nop (reference_type
, expr
);
9025 return convert_from_reference (expr
);
9029 expr
= decay_conversion (expr
, complain
);
9030 if (expr
== error_mark_node
)
9031 return error_mark_node
;
9033 /* build_c_cast puts on a NOP_EXPR to make the result not an
9034 lvalue. Strip such NOP_EXPRs if VALUE is being used in
9035 non-lvalue context. */
9036 if (TREE_CODE (expr
) == NOP_EXPR
9037 && TREE_TYPE (expr
) == TREE_TYPE (TREE_OPERAND (expr
, 0)))
9038 expr
= TREE_OPERAND (expr
, 0);
9039 return build_nop (dst_type
, expr
);
9043 && !at_least_as_qualified_p (TREE_TYPE (dst_type
),
9044 TREE_TYPE (src_type
)))
9045 check_for_casting_away_constness (loc
, src_type
, dst_type
,
9046 CAST_EXPR
, complain
);
9049 if (complain
& tf_error
)
9050 error_at (loc
, "invalid %<const_cast%> from type %qT to type %qT",
9051 src_type
, dst_type
);
9052 return error_mark_node
;
9056 build_const_cast (location_t loc
, tree type
, tree expr
,
9057 tsubst_flags_t complain
)
9061 if (type
== error_mark_node
|| error_operand_p (expr
))
9062 return error_mark_node
;
9064 if (processing_template_decl
)
9066 tree t
= build_min (CONST_CAST_EXPR
, type
, expr
);
9068 if (!TREE_SIDE_EFFECTS (t
)
9069 && type_dependent_expression_p (expr
))
9070 /* There might turn out to be side effects inside expr. */
9071 TREE_SIDE_EFFECTS (t
) = 1;
9072 r
= convert_from_reference (t
);
9073 protected_set_expr_location (r
, loc
);
9077 r
= build_const_cast_1 (loc
, type
, expr
, complain
, /*valid_p=*/NULL
);
9078 if (r
!= error_mark_node
)
9080 maybe_warn_about_useless_cast (loc
, type
, expr
, complain
);
9081 maybe_warn_about_cast_ignoring_quals (loc
, type
, complain
);
9083 protected_set_expr_location (r
, loc
);
9087 /* Like cp_build_c_cast, but for the c-common bits. */
9090 build_c_cast (location_t loc
, tree type
, tree expr
)
9092 return cp_build_c_cast (loc
, type
, expr
, tf_warning_or_error
);
9095 /* Like the "build_c_cast" used for c-common, but using cp_expr to
9096 preserve location information even for tree nodes that don't
9100 build_c_cast (location_t loc
, tree type
, cp_expr expr
)
9102 cp_expr result
= cp_build_c_cast (loc
, type
, expr
, tf_warning_or_error
);
9103 result
.set_location (loc
);
9107 /* Build an expression representing an explicit C-style cast to type
9108 TYPE of expression EXPR. */
9111 cp_build_c_cast (location_t loc
, tree type
, tree expr
,
9112 tsubst_flags_t complain
)
9118 if (type
== error_mark_node
|| error_operand_p (expr
))
9119 return error_mark_node
;
9121 if (processing_template_decl
)
9123 tree t
= build_min (CAST_EXPR
, type
,
9124 tree_cons (NULL_TREE
, value
, NULL_TREE
));
9125 /* We don't know if it will or will not have side effects. */
9126 TREE_SIDE_EFFECTS (t
) = 1;
9127 return convert_from_reference (t
);
9130 /* Casts to a (pointer to a) specific ObjC class (or 'id' or
9131 'Class') should always be retained, because this information aids
9132 in method lookup. */
9133 if (objc_is_object_ptr (type
)
9134 && objc_is_object_ptr (TREE_TYPE (expr
)))
9135 return build_nop (type
, expr
);
9137 /* build_c_cast puts on a NOP_EXPR to make the result not an lvalue.
9138 Strip such NOP_EXPRs if VALUE is being used in non-lvalue context. */
9139 if (!TYPE_REF_P (type
)
9140 && TREE_CODE (value
) == NOP_EXPR
9141 && TREE_TYPE (value
) == TREE_TYPE (TREE_OPERAND (value
, 0)))
9142 value
= TREE_OPERAND (value
, 0);
9144 if (TREE_CODE (type
) == ARRAY_TYPE
)
9146 /* Allow casting from T1* to T2[] because Cfront allows it.
9147 NIHCL uses it. It is not valid ISO C++ however. */
9148 if (TYPE_PTR_P (TREE_TYPE (expr
)))
9150 if (complain
& tf_error
)
9151 permerror (loc
, "ISO C++ forbids casting to an array type %qT",
9154 return error_mark_node
;
9155 type
= build_pointer_type (TREE_TYPE (type
));
9159 if (complain
& tf_error
)
9160 error_at (loc
, "ISO C++ forbids casting to an array type %qT",
9162 return error_mark_node
;
9166 if (FUNC_OR_METHOD_TYPE_P (type
))
9168 if (complain
& tf_error
)
9169 error_at (loc
, "invalid cast to function type %qT", type
);
9170 return error_mark_node
;
9173 if (TYPE_PTR_P (type
)
9174 && TREE_CODE (TREE_TYPE (value
)) == INTEGER_TYPE
9175 /* Casting to an integer of smaller size is an error detected elsewhere. */
9176 && TYPE_PRECISION (type
) > TYPE_PRECISION (TREE_TYPE (value
))
9177 /* Don't warn about converting any constant. */
9178 && !TREE_CONSTANT (value
))
9179 warning_at (loc
, OPT_Wint_to_pointer_cast
,
9180 "cast to pointer from integer of different size");
9182 /* A C-style cast can be a const_cast. */
9183 result
= build_const_cast_1 (loc
, type
, value
, complain
& tf_warning
,
9187 if (result
!= error_mark_node
)
9189 maybe_warn_about_useless_cast (loc
, type
, value
, complain
);
9190 maybe_warn_about_cast_ignoring_quals (loc
, type
, complain
);
9195 /* Or a static cast. */
9196 result
= build_static_cast_1 (loc
, type
, value
, /*c_cast_p=*/true,
9197 &valid_p
, complain
);
9198 /* Or a reinterpret_cast. */
9200 result
= build_reinterpret_cast_1 (loc
, type
, value
, /*c_cast_p=*/true,
9201 &valid_p
, complain
);
9202 /* The static_cast or reinterpret_cast may be followed by a
9205 /* A valid cast may result in errors if, for example, a
9206 conversion to an ambiguous base class is required. */
9207 && !error_operand_p (result
))
9211 maybe_warn_about_useless_cast (loc
, type
, value
, complain
);
9212 maybe_warn_about_cast_ignoring_quals (loc
, type
, complain
);
9214 /* Non-class rvalues always have cv-unqualified type. */
9215 if (!CLASS_TYPE_P (type
))
9216 type
= TYPE_MAIN_VARIANT (type
);
9217 result_type
= TREE_TYPE (result
);
9218 if (!CLASS_TYPE_P (result_type
) && !TYPE_REF_P (type
))
9219 result_type
= TYPE_MAIN_VARIANT (result_type
);
9220 /* If the type of RESULT does not match TYPE, perform a
9221 const_cast to make it match. If the static_cast or
9222 reinterpret_cast succeeded, we will differ by at most
9223 cv-qualification, so the follow-on const_cast is guaranteed
9225 if (!same_type_p (non_reference (type
), non_reference (result_type
)))
9227 result
= build_const_cast_1 (loc
, type
, result
, false, &valid_p
);
9228 gcc_assert (valid_p
);
9233 return error_mark_node
;
9236 /* Warn when a value is moved to itself with std::move. LHS is the target,
9237 RHS may be the std::move call, and LOC is the location of the whole
9241 maybe_warn_self_move (location_t loc
, tree lhs
, tree rhs
)
9243 if (!warn_self_move
)
9246 /* C++98 doesn't know move. */
9247 if (cxx_dialect
< cxx11
)
9250 if (processing_template_decl
)
9253 if (!REFERENCE_REF_P (rhs
)
9254 || TREE_CODE (TREE_OPERAND (rhs
, 0)) != CALL_EXPR
)
9256 tree fn
= TREE_OPERAND (rhs
, 0);
9257 if (!is_std_move_p (fn
))
9260 /* Just a little helper to strip * and various NOPs. */
9261 auto extract_op
= [] (tree
&op
) {
9263 while (INDIRECT_REF_P (op
))
9264 op
= TREE_OPERAND (op
, 0);
9265 op
= maybe_undo_parenthesized_ref (op
);
9266 STRIP_ANY_LOCATION_WRAPPER (op
);
9269 tree arg
= CALL_EXPR_ARG (fn
, 0);
9271 if (TREE_CODE (arg
) == ADDR_EXPR
)
9272 arg
= TREE_OPERAND (arg
, 0);
9273 tree type
= TREE_TYPE (lhs
);
9274 tree orig_lhs
= lhs
;
9276 if (cp_tree_equal (lhs
, arg
))
9278 auto_diagnostic_group d
;
9279 if (warning_at (loc
, OPT_Wself_move
,
9280 "moving %qE of type %qT to itself", orig_lhs
, type
))
9281 inform (loc
, "remove %<std::move%> call");
9285 /* For use from the C common bits. */
9287 build_modify_expr (location_t location
,
9288 tree lhs
, tree
/*lhs_origtype*/,
9289 enum tree_code modifycode
,
9290 location_t
/*rhs_location*/, tree rhs
,
9291 tree
/*rhs_origtype*/)
9293 return cp_build_modify_expr (location
, lhs
, modifycode
, rhs
,
9294 tf_warning_or_error
);
9297 /* Build an assignment expression of lvalue LHS from value RHS.
9298 MODIFYCODE is the code for a binary operator that we use
9299 to combine the old value of LHS with RHS to get the new value.
9300 Or else MODIFYCODE is NOP_EXPR meaning do a simple assignment.
9302 C++: If MODIFYCODE is INIT_EXPR, then leave references unbashed. */
9305 cp_build_modify_expr (location_t loc
, tree lhs
, enum tree_code modifycode
,
9306 tree rhs
, tsubst_flags_t complain
)
9308 lhs
= mark_lvalue_use_nonread (lhs
);
9310 tree result
= NULL_TREE
;
9312 tree lhstype
= TREE_TYPE (lhs
);
9314 tree olhstype
= lhstype
;
9315 bool plain_assign
= (modifycode
== NOP_EXPR
);
9316 bool compound_side_effects_p
= false;
9317 tree preeval
= NULL_TREE
;
9319 /* Avoid duplicate error messages from operands that had errors. */
9320 if (error_operand_p (lhs
) || error_operand_p (rhs
))
9321 return error_mark_node
;
9323 while (TREE_CODE (lhs
) == COMPOUND_EXPR
)
9325 if (TREE_SIDE_EFFECTS (TREE_OPERAND (lhs
, 0)))
9326 compound_side_effects_p
= true;
9327 lhs
= TREE_OPERAND (lhs
, 1);
9330 /* Handle control structure constructs used as "lvalues". Note that we
9331 leave COMPOUND_EXPR on the LHS because it is sequenced after the RHS. */
9332 switch (TREE_CODE (lhs
))
9334 /* Handle --foo = 5; as these are valid constructs in C++. */
9335 case PREDECREMENT_EXPR
:
9336 case PREINCREMENT_EXPR
:
9337 if (compound_side_effects_p
)
9338 newrhs
= rhs
= stabilize_expr (rhs
, &preeval
);
9339 lhs
= genericize_compound_lvalue (lhs
);
9341 /* If we had (bar, --foo) = 5; or (bar, (baz, --foo)) = 5;
9342 and looked through the COMPOUND_EXPRs, readd them now around
9343 the resulting lhs. */
9344 if (TREE_CODE (olhs
) == COMPOUND_EXPR
)
9346 lhs
= build2 (COMPOUND_EXPR
, lhstype
, TREE_OPERAND (olhs
, 0), lhs
);
9347 tree
*ptr
= &TREE_OPERAND (lhs
, 1);
9348 for (olhs
= TREE_OPERAND (olhs
, 1);
9349 TREE_CODE (olhs
) == COMPOUND_EXPR
;
9350 olhs
= TREE_OPERAND (olhs
, 1))
9352 *ptr
= build2 (COMPOUND_EXPR
, lhstype
,
9353 TREE_OPERAND (olhs
, 0), *ptr
);
9354 ptr
= &TREE_OPERAND (*ptr
, 1);
9360 if (compound_side_effects_p
)
9361 newrhs
= rhs
= stabilize_expr (rhs
, &preeval
);
9362 lhs
= genericize_compound_lvalue (lhs
);
9363 goto maybe_add_compound
;
9367 /* MIN_EXPR and MAX_EXPR are currently only permitted as lvalues,
9368 when neither operand has side-effects. */
9369 if (!lvalue_or_else (lhs
, lv_assign
, complain
))
9370 return error_mark_node
;
9372 gcc_assert (!TREE_SIDE_EFFECTS (TREE_OPERAND (lhs
, 0))
9373 && !TREE_SIDE_EFFECTS (TREE_OPERAND (lhs
, 1)));
9375 lhs
= build3 (COND_EXPR
, TREE_TYPE (lhs
),
9376 build2 (TREE_CODE (lhs
) == MIN_EXPR
? LE_EXPR
: GE_EXPR
,
9378 TREE_OPERAND (lhs
, 0),
9379 TREE_OPERAND (lhs
, 1)),
9380 TREE_OPERAND (lhs
, 0),
9381 TREE_OPERAND (lhs
, 1));
9384 /* Handle (a ? b : c) used as an "lvalue". */
9387 /* Produce (a ? (b = rhs) : (c = rhs))
9388 except that the RHS goes through a save-expr
9389 so the code to compute it is only emitted once. */
9390 if (VOID_TYPE_P (TREE_TYPE (rhs
)))
9392 if (complain
& tf_error
)
9393 error_at (cp_expr_loc_or_loc (rhs
, loc
),
9394 "void value not ignored as it ought to be");
9395 return error_mark_node
;
9398 rhs
= stabilize_expr (rhs
, &preeval
);
9400 /* Check this here to avoid odd errors when trying to convert
9401 a throw to the type of the COND_EXPR. */
9402 if (!lvalue_or_else (lhs
, lv_assign
, complain
))
9403 return error_mark_node
;
9405 tree op1
= TREE_OPERAND (lhs
, 1);
9406 if (TREE_CODE (op1
) != THROW_EXPR
)
9407 op1
= cp_build_modify_expr (loc
, op1
, modifycode
, rhs
, complain
);
9408 /* When sanitizing undefined behavior, even when rhs doesn't need
9409 stabilization at this point, the sanitization might add extra
9410 SAVE_EXPRs in there and so make sure there is no tree sharing
9411 in the rhs, otherwise those SAVE_EXPRs will have initialization
9412 only in one of the two branches. */
9413 if (sanitize_flags_p (SANITIZE_UNDEFINED
9414 | SANITIZE_UNDEFINED_NONDEFAULT
))
9415 rhs
= unshare_expr (rhs
);
9416 tree op2
= TREE_OPERAND (lhs
, 2);
9417 if (TREE_CODE (op2
) != THROW_EXPR
)
9418 op2
= cp_build_modify_expr (loc
, op2
, modifycode
, rhs
, complain
);
9419 tree cond
= build_conditional_expr (input_location
,
9420 TREE_OPERAND (lhs
, 0), op1
, op2
,
9423 if (cond
== error_mark_node
)
9425 /* If we had (e, (a ? b : c)) = d; or (e, (f, (a ? b : c))) = d;
9426 and looked through the COMPOUND_EXPRs, readd them now around
9427 the resulting cond before adding the preevaluated rhs. */
9428 if (TREE_CODE (olhs
) == COMPOUND_EXPR
)
9430 cond
= build2 (COMPOUND_EXPR
, TREE_TYPE (cond
),
9431 TREE_OPERAND (olhs
, 0), cond
);
9432 tree
*ptr
= &TREE_OPERAND (cond
, 1);
9433 for (olhs
= TREE_OPERAND (olhs
, 1);
9434 TREE_CODE (olhs
) == COMPOUND_EXPR
;
9435 olhs
= TREE_OPERAND (olhs
, 1))
9437 *ptr
= build2 (COMPOUND_EXPR
, TREE_TYPE (cond
),
9438 TREE_OPERAND (olhs
, 0), *ptr
);
9439 ptr
= &TREE_OPERAND (*ptr
, 1);
9442 /* Make sure the code to compute the rhs comes out
9443 before the split. */
9453 if (modifycode
== INIT_EXPR
)
9455 if (BRACE_ENCLOSED_INITIALIZER_P (rhs
))
9456 /* Do the default thing. */;
9457 else if (TREE_CODE (rhs
) == CONSTRUCTOR
)
9459 /* Compound literal. */
9460 if (! same_type_p (TREE_TYPE (rhs
), lhstype
))
9461 /* Call convert to generate an error; see PR 11063. */
9462 rhs
= convert (lhstype
, rhs
);
9463 result
= cp_build_init_expr (lhs
, rhs
);
9464 TREE_SIDE_EFFECTS (result
) = 1;
9467 else if (! MAYBE_CLASS_TYPE_P (lhstype
))
9468 /* Do the default thing. */;
9471 releasing_vec rhs_vec
= make_tree_vector_single (rhs
);
9472 result
= build_special_member_call (lhs
, complete_ctor_identifier
,
9473 &rhs_vec
, lhstype
, LOOKUP_NORMAL
,
9475 if (result
== NULL_TREE
)
9476 return error_mark_node
;
9482 lhs
= require_complete_type (lhs
, complain
);
9483 if (lhs
== error_mark_node
)
9484 return error_mark_node
;
9486 if (modifycode
== NOP_EXPR
)
9488 maybe_warn_self_move (loc
, lhs
, rhs
);
9490 if (c_dialect_objc ())
9492 result
= objc_maybe_build_modify_expr (lhs
, rhs
);
9497 /* `operator=' is not an inheritable operator. */
9498 if (! MAYBE_CLASS_TYPE_P (lhstype
))
9499 /* Do the default thing. */;
9502 result
= build_new_op (input_location
, MODIFY_EXPR
,
9503 LOOKUP_NORMAL
, lhs
, rhs
,
9504 make_node (NOP_EXPR
), NULL_TREE
,
9505 /*overload=*/NULL
, complain
);
9506 if (result
== NULL_TREE
)
9507 return error_mark_node
;
9514 tree init
= NULL_TREE
;
9516 /* A binary op has been requested. Combine the old LHS
9517 value with the RHS producing the value we should actually
9518 store into the LHS. */
9519 gcc_assert (!((TYPE_REF_P (lhstype
)
9520 && MAYBE_CLASS_TYPE_P (TREE_TYPE (lhstype
)))
9521 || MAYBE_CLASS_TYPE_P (lhstype
)));
9523 /* Preevaluate the RHS to make sure its evaluation is complete
9524 before the lvalue-to-rvalue conversion of the LHS:
9526 [expr.ass] With respect to an indeterminately-sequenced
9527 function call, the operation of a compound assignment is a
9528 single evaluation. [ Note: Therefore, a function call shall
9529 not intervene between the lvalue-to-rvalue conversion and the
9530 side effect associated with any single compound assignment
9531 operator. -- end note ] */
9532 lhs
= cp_stabilize_reference (lhs
);
9533 rhs
= decay_conversion (rhs
, complain
);
9534 if (rhs
== error_mark_node
)
9535 return error_mark_node
;
9536 rhs
= stabilize_expr (rhs
, &init
);
9537 newrhs
= cp_build_binary_op (loc
, modifycode
, lhs
, rhs
, complain
);
9538 if (newrhs
== error_mark_node
)
9540 if (complain
& tf_error
)
9541 inform (loc
, " in evaluation of %<%Q(%#T, %#T)%>",
9542 modifycode
, TREE_TYPE (lhs
), TREE_TYPE (rhs
));
9543 return error_mark_node
;
9547 newrhs
= build2 (COMPOUND_EXPR
, TREE_TYPE (newrhs
), init
, newrhs
);
9549 /* Now it looks like a plain assignment. */
9550 modifycode
= NOP_EXPR
;
9551 if (c_dialect_objc ())
9553 result
= objc_maybe_build_modify_expr (lhs
, newrhs
);
9558 gcc_assert (!TYPE_REF_P (lhstype
));
9559 gcc_assert (!TYPE_REF_P (TREE_TYPE (newrhs
)));
9562 /* The left-hand side must be an lvalue. */
9563 if (!lvalue_or_else (lhs
, lv_assign
, complain
))
9564 return error_mark_node
;
9566 /* Warn about modifying something that is `const'. Don't warn if
9567 this is initialization. */
9568 if (modifycode
!= INIT_EXPR
9569 && (TREE_READONLY (lhs
) || CP_TYPE_CONST_P (lhstype
)
9570 /* Functions are not modifiable, even though they are
9572 || FUNC_OR_METHOD_TYPE_P (TREE_TYPE (lhs
))
9573 /* If it's an aggregate and any field is const, then it is
9574 effectively const. */
9575 || (CLASS_TYPE_P (lhstype
)
9576 && C_TYPE_FIELDS_READONLY (lhstype
))))
9578 if (complain
& tf_error
)
9579 cxx_readonly_error (loc
, lhs
, lv_assign
);
9580 return error_mark_node
;
9583 /* If storing into a structure or union member, it may have been given a
9584 lowered bitfield type. We need to convert to the declared type first,
9585 so retrieve it now. */
9587 olhstype
= unlowered_expr_type (lhs
);
9589 /* Convert new value to destination type. */
9591 if (TREE_CODE (lhstype
) == ARRAY_TYPE
)
9595 if (BRACE_ENCLOSED_INITIALIZER_P (newrhs
))
9597 if (modifycode
!= INIT_EXPR
)
9599 if (complain
& tf_error
)
9601 "assigning to an array from an initializer list");
9602 return error_mark_node
;
9604 if (check_array_initializer (lhs
, lhstype
, newrhs
))
9605 return error_mark_node
;
9606 newrhs
= digest_init (lhstype
, newrhs
, complain
);
9607 if (newrhs
== error_mark_node
)
9608 return error_mark_node
;
9611 /* C++11 8.5/17: "If the destination type is an array of characters,
9612 an array of char16_t, an array of char32_t, or an array of wchar_t,
9613 and the initializer is a string literal...". */
9614 else if ((TREE_CODE (tree_strip_any_location_wrapper (newrhs
))
9616 && char_type_p (TREE_TYPE (TYPE_MAIN_VARIANT (lhstype
)))
9617 && modifycode
== INIT_EXPR
)
9619 newrhs
= digest_init (lhstype
, newrhs
, complain
);
9620 if (newrhs
== error_mark_node
)
9621 return error_mark_node
;
9624 else if (!same_or_base_type_p (TYPE_MAIN_VARIANT (lhstype
),
9625 TYPE_MAIN_VARIANT (TREE_TYPE (newrhs
))))
9627 if (complain
& tf_error
)
9628 error_at (loc
, "incompatible types in assignment of %qT to %qT",
9629 TREE_TYPE (rhs
), lhstype
);
9630 return error_mark_node
;
9633 /* Allow array assignment in compiler-generated code. */
9634 else if (DECL_P (lhs
) && DECL_ARTIFICIAL (lhs
))
9635 /* OK, used by coroutines (co-await-initlist1.C). */;
9636 else if (!current_function_decl
9637 || !DECL_DEFAULTED_FN (current_function_decl
))
9639 /* This routine is used for both initialization and assignment.
9640 Make sure the diagnostic message differentiates the context. */
9641 if (complain
& tf_error
)
9643 if (modifycode
== INIT_EXPR
)
9644 error_at (loc
, "array used as initializer");
9646 error_at (loc
, "invalid array assignment");
9648 return error_mark_node
;
9651 from_array
= TREE_CODE (TREE_TYPE (newrhs
)) == ARRAY_TYPE
9652 ? 1 + (modifycode
!= INIT_EXPR
): 0;
9653 result
= build_vec_init (lhs
, NULL_TREE
, newrhs
,
9654 /*explicit_value_init_p=*/false,
9655 from_array
, complain
);
9659 if (modifycode
== INIT_EXPR
)
9660 /* Calls with INIT_EXPR are all direct-initialization, so don't set
9661 LOOKUP_ONLYCONVERTING. */
9662 newrhs
= convert_for_initialization (lhs
, olhstype
, newrhs
, LOOKUP_NORMAL
,
9663 ICR_INIT
, NULL_TREE
, 0,
9664 complain
| tf_no_cleanup
);
9666 newrhs
= convert_for_assignment (olhstype
, newrhs
, ICR_ASSIGN
,
9667 NULL_TREE
, 0, complain
, LOOKUP_IMPLICIT
);
9669 if (!same_type_p (lhstype
, olhstype
))
9670 newrhs
= cp_convert_and_check (lhstype
, newrhs
, complain
);
9672 if (modifycode
!= INIT_EXPR
)
9674 if (TREE_CODE (newrhs
) == CALL_EXPR
9675 && TYPE_NEEDS_CONSTRUCTING (lhstype
))
9676 newrhs
= build_cplus_new (lhstype
, newrhs
, complain
);
9678 /* Can't initialize directly from a TARGET_EXPR, since that would
9679 cause the lhs to be constructed twice, and possibly result in
9680 accidental self-initialization. So we force the TARGET_EXPR to be
9681 expanded without a target. */
9682 if (TREE_CODE (newrhs
) == TARGET_EXPR
)
9683 newrhs
= build2 (COMPOUND_EXPR
, TREE_TYPE (newrhs
), newrhs
,
9684 TREE_OPERAND (newrhs
, 0));
9687 if (newrhs
== error_mark_node
)
9688 return error_mark_node
;
9690 if (c_dialect_objc () && flag_objc_gc
)
9692 result
= objc_generate_write_barrier (lhs
, modifycode
, newrhs
);
9698 result
= build2_loc (loc
, modifycode
== NOP_EXPR
? MODIFY_EXPR
: INIT_EXPR
,
9699 lhstype
, lhs
, newrhs
);
9700 if (modifycode
== INIT_EXPR
)
9701 set_target_expr_eliding (newrhs
);
9703 TREE_SIDE_EFFECTS (result
) = 1;
9705 suppress_warning (result
, OPT_Wparentheses
);
9709 result
= build2 (COMPOUND_EXPR
, TREE_TYPE (result
), preeval
, result
);
9714 build_x_modify_expr (location_t loc
, tree lhs
, enum tree_code modifycode
,
9715 tree rhs
, tree lookups
, tsubst_flags_t complain
)
9717 tree orig_lhs
= lhs
;
9718 tree orig_rhs
= rhs
;
9719 tree overload
= NULL_TREE
;
9721 if (lhs
== error_mark_node
|| rhs
== error_mark_node
)
9722 return cp_expr (error_mark_node
, loc
);
9724 if (processing_template_decl
)
9726 if (modifycode
== NOP_EXPR
9727 || type_dependent_expression_p (lhs
)
9728 || type_dependent_expression_p (rhs
))
9730 tree op
= build_min_nt_loc (loc
, modifycode
, NULL_TREE
, NULL_TREE
);
9731 tree rval
= build_min_nt_loc (loc
, MODOP_EXPR
, lhs
, op
, rhs
);
9732 if (modifycode
!= NOP_EXPR
)
9734 = build_dependent_operator_type (lookups
, modifycode
, true);
9738 lhs
= build_non_dependent_expr (lhs
);
9739 rhs
= build_non_dependent_expr (rhs
);
9742 if (modifycode
!= NOP_EXPR
)
9744 tree op
= build_nt (modifycode
, NULL_TREE
, NULL_TREE
);
9745 tree rval
= build_new_op (loc
, MODIFY_EXPR
, LOOKUP_NORMAL
,
9746 lhs
, rhs
, op
, lookups
, &overload
, complain
);
9749 if (rval
== error_mark_node
)
9751 suppress_warning (rval
/* What warning? */);
9752 if (processing_template_decl
)
9754 if (overload
!= NULL_TREE
)
9755 return (build_min_non_dep_op_overload
9756 (MODIFY_EXPR
, rval
, overload
, orig_lhs
, orig_rhs
));
9758 return (build_min_non_dep
9759 (MODOP_EXPR
, rval
, orig_lhs
, op
, orig_rhs
));
9764 return cp_build_modify_expr (loc
, lhs
, modifycode
, rhs
, complain
);
9767 /* Helper function for get_delta_difference which assumes FROM is a base
9768 class of TO. Returns a delta for the conversion of pointer-to-member
9769 of FROM to pointer-to-member of TO. If the conversion is invalid and
9770 tf_error is not set in COMPLAIN returns error_mark_node, otherwise
9771 returns zero. If FROM is not a base class of TO, returns NULL_TREE.
9772 If C_CAST_P is true, this conversion is taking place as part of a
9776 get_delta_difference_1 (tree from
, tree to
, bool c_cast_p
,
9777 tsubst_flags_t complain
)
9782 binfo
= lookup_base (to
, from
, c_cast_p
? ba_unique
: ba_check
,
9785 if (binfo
== error_mark_node
)
9787 if (!(complain
& tf_error
))
9788 return error_mark_node
;
9790 inform (input_location
, " in pointer to member function conversion");
9791 return size_zero_node
;
9795 if (kind
!= bk_via_virtual
)
9796 return BINFO_OFFSET (binfo
);
9798 /* FROM is a virtual base class of TO. Issue an error or warning
9799 depending on whether or not this is a reinterpret cast. */
9801 if (!(complain
& tf_error
))
9802 return error_mark_node
;
9804 error ("pointer to member conversion via virtual base %qT",
9805 BINFO_TYPE (binfo_from_vbase (binfo
)));
9807 return size_zero_node
;
9814 /* Get difference in deltas for different pointer to member function
9815 types. If the conversion is invalid and tf_error is not set in
9816 COMPLAIN, returns error_mark_node, otherwise returns an integer
9817 constant of type PTRDIFF_TYPE_NODE and its value is zero if the
9818 conversion is invalid. If ALLOW_INVERSE_P is true, then allow reverse
9819 conversions as well. If C_CAST_P is true this conversion is taking
9820 place as part of a C-style cast.
9822 Note that the naming of FROM and TO is kind of backwards; the return
9823 value is what we add to a TO in order to get a FROM. They are named
9824 this way because we call this function to find out how to convert from
9825 a pointer to member of FROM to a pointer to member of TO. */
9828 get_delta_difference (tree from
, tree to
,
9829 bool allow_inverse_p
,
9830 bool c_cast_p
, tsubst_flags_t complain
)
9834 if (same_type_ignoring_top_level_qualifiers_p (from
, to
))
9835 /* Pointer to member of incomplete class is permitted*/
9836 result
= size_zero_node
;
9838 result
= get_delta_difference_1 (from
, to
, c_cast_p
, complain
);
9840 if (result
== error_mark_node
)
9841 return error_mark_node
;
9845 if (!allow_inverse_p
)
9847 if (!(complain
& tf_error
))
9848 return error_mark_node
;
9850 error_not_base_type (from
, to
);
9851 inform (input_location
, " in pointer to member conversion");
9852 result
= size_zero_node
;
9856 result
= get_delta_difference_1 (to
, from
, c_cast_p
, complain
);
9858 if (result
== error_mark_node
)
9859 return error_mark_node
;
9862 result
= size_diffop_loc (input_location
,
9863 size_zero_node
, result
);
9866 if (!(complain
& tf_error
))
9867 return error_mark_node
;
9869 error_not_base_type (from
, to
);
9870 inform (input_location
, " in pointer to member conversion");
9871 result
= size_zero_node
;
9876 return convert_to_integer (ptrdiff_type_node
, result
);
9879 /* Return a constructor for the pointer-to-member-function TYPE using
9880 the other components as specified. */
9883 build_ptrmemfunc1 (tree type
, tree delta
, tree pfn
)
9888 vec
<constructor_elt
, va_gc
> *v
;
9890 /* Pull the FIELD_DECLs out of the type. */
9891 pfn_field
= TYPE_FIELDS (type
);
9892 delta_field
= DECL_CHAIN (pfn_field
);
9894 /* Make sure DELTA has the type we want. */
9895 delta
= convert_and_check (input_location
, delta_type_node
, delta
);
9897 /* Convert to the correct target type if necessary. */
9898 pfn
= fold_convert (TREE_TYPE (pfn_field
), pfn
);
9900 /* Finish creating the initializer. */
9902 CONSTRUCTOR_APPEND_ELT(v
, pfn_field
, pfn
);
9903 CONSTRUCTOR_APPEND_ELT(v
, delta_field
, delta
);
9904 u
= build_constructor (type
, v
);
9905 TREE_CONSTANT (u
) = TREE_CONSTANT (pfn
) & TREE_CONSTANT (delta
);
9906 TREE_STATIC (u
) = (TREE_CONSTANT (u
)
9907 && (initializer_constant_valid_p (pfn
, TREE_TYPE (pfn
))
9909 && (initializer_constant_valid_p (delta
, TREE_TYPE (delta
))
9914 /* Build a constructor for a pointer to member function. It can be
9915 used to initialize global variables, local variable, or used
9916 as a value in expressions. TYPE is the POINTER to METHOD_TYPE we
9919 If FORCE is nonzero, then force this conversion, even if
9920 we would rather not do it. Usually set when using an explicit
9921 cast. A C-style cast is being processed iff C_CAST_P is true.
9923 Return error_mark_node, if something goes wrong. */
9926 build_ptrmemfunc (tree type
, tree pfn
, int force
, bool c_cast_p
,
9927 tsubst_flags_t complain
)
9933 if (error_operand_p (pfn
))
9934 return error_mark_node
;
9936 pfn_type
= TREE_TYPE (pfn
);
9937 to_type
= build_ptrmemfunc_type (type
);
9939 /* Handle multiple conversions of pointer to member functions. */
9940 if (TYPE_PTRMEMFUNC_P (pfn_type
))
9942 tree delta
= NULL_TREE
;
9943 tree npfn
= NULL_TREE
;
9947 && !can_convert_arg (to_type
, TREE_TYPE (pfn
), pfn
,
9948 LOOKUP_NORMAL
, complain
))
9950 if (complain
& tf_error
)
9951 error ("invalid conversion to type %qT from type %qT",
9954 return error_mark_node
;
9957 n
= get_delta_difference (TYPE_PTRMEMFUNC_OBJECT_TYPE (pfn_type
),
9958 TYPE_PTRMEMFUNC_OBJECT_TYPE (to_type
),
9960 c_cast_p
, complain
);
9961 if (n
== error_mark_node
)
9962 return error_mark_node
;
9964 STRIP_ANY_LOCATION_WRAPPER (pfn
);
9966 /* We don't have to do any conversion to convert a
9967 pointer-to-member to its own type. But, we don't want to
9968 just return a PTRMEM_CST if there's an explicit cast; that
9969 cast should make the expression an invalid template argument. */
9970 if (TREE_CODE (pfn
) != PTRMEM_CST
9971 && same_type_p (to_type
, pfn_type
))
9974 if (TREE_SIDE_EFFECTS (pfn
))
9975 pfn
= save_expr (pfn
);
9977 /* Obtain the function pointer and the current DELTA. */
9978 if (TREE_CODE (pfn
) == PTRMEM_CST
)
9979 expand_ptrmemfunc_cst (pfn
, &delta
, &npfn
);
9982 npfn
= build_ptrmemfunc_access_expr (pfn
, pfn_identifier
);
9983 delta
= build_ptrmemfunc_access_expr (pfn
, delta_identifier
);
9986 /* Just adjust the DELTA field. */
9987 gcc_assert (same_type_ignoring_top_level_qualifiers_p
9988 (TREE_TYPE (delta
), ptrdiff_type_node
));
9989 if (!integer_zerop (n
))
9991 if (TARGET_PTRMEMFUNC_VBIT_LOCATION
== ptrmemfunc_vbit_in_delta
)
9992 n
= cp_build_binary_op (input_location
,
9993 LSHIFT_EXPR
, n
, integer_one_node
,
9995 delta
= cp_build_binary_op (input_location
,
9996 PLUS_EXPR
, delta
, n
, complain
);
9998 return build_ptrmemfunc1 (to_type
, delta
, npfn
);
10001 /* Handle null pointer to member function conversions. */
10002 if (null_ptr_cst_p (pfn
))
10004 pfn
= cp_build_c_cast (input_location
,
10005 TYPE_PTRMEMFUNC_FN_TYPE_RAW (to_type
),
10007 return build_ptrmemfunc1 (to_type
,
10012 if (type_unknown_p (pfn
))
10013 return instantiate_type (type
, pfn
, complain
);
10015 fn
= TREE_OPERAND (pfn
, 0);
10016 gcc_assert (TREE_CODE (fn
) == FUNCTION_DECL
10017 /* In a template, we will have preserved the
10019 || (processing_template_decl
&& TREE_CODE (fn
) == OFFSET_REF
));
10020 return make_ptrmem_cst (to_type
, fn
);
10023 /* Return the DELTA, IDX, PFN, and DELTA2 values for the PTRMEM_CST
10026 ??? There is no consistency as to the types returned for the above
10027 values. Some code acts as if it were a sizetype and some as if it were
10028 integer_type_node. */
10031 expand_ptrmemfunc_cst (tree cst
, tree
*delta
, tree
*pfn
)
10033 tree type
= TREE_TYPE (cst
);
10034 tree fn
= PTRMEM_CST_MEMBER (cst
);
10035 tree ptr_class
, fn_class
;
10037 gcc_assert (TREE_CODE (fn
) == FUNCTION_DECL
);
10039 /* The class that the function belongs to. */
10040 fn_class
= DECL_CONTEXT (fn
);
10042 /* The class that we're creating a pointer to member of. */
10043 ptr_class
= TYPE_PTRMEMFUNC_OBJECT_TYPE (type
);
10045 /* First, calculate the adjustment to the function's class. */
10046 *delta
= get_delta_difference (fn_class
, ptr_class
, /*force=*/0,
10047 /*c_cast_p=*/0, tf_warning_or_error
);
10049 if (!DECL_VIRTUAL_P (fn
))
10051 tree t
= build_addr_func (fn
, tf_warning_or_error
);
10052 if (TREE_CODE (t
) == ADDR_EXPR
)
10053 SET_EXPR_LOCATION (t
, PTRMEM_CST_LOCATION (cst
));
10054 *pfn
= convert (TYPE_PTRMEMFUNC_FN_TYPE (type
), t
);
10058 /* If we're dealing with a virtual function, we have to adjust 'this'
10059 again, to point to the base which provides the vtable entry for
10060 fn; the call will do the opposite adjustment. */
10061 tree orig_class
= DECL_CONTEXT (fn
);
10062 tree binfo
= binfo_or_else (orig_class
, fn_class
);
10063 *delta
= fold_build2 (PLUS_EXPR
, TREE_TYPE (*delta
),
10064 *delta
, BINFO_OFFSET (binfo
));
10066 /* We set PFN to the vtable offset at which the function can be
10067 found, plus one (unless ptrmemfunc_vbit_in_delta, in which
10068 case delta is shifted left, and then incremented). */
10069 *pfn
= DECL_VINDEX (fn
);
10070 *pfn
= fold_build2 (MULT_EXPR
, integer_type_node
, *pfn
,
10071 TYPE_SIZE_UNIT (vtable_entry_type
));
10073 switch (TARGET_PTRMEMFUNC_VBIT_LOCATION
)
10075 case ptrmemfunc_vbit_in_pfn
:
10076 *pfn
= fold_build2 (PLUS_EXPR
, integer_type_node
, *pfn
,
10080 case ptrmemfunc_vbit_in_delta
:
10081 *delta
= fold_build2 (LSHIFT_EXPR
, TREE_TYPE (*delta
),
10082 *delta
, integer_one_node
);
10083 *delta
= fold_build2 (PLUS_EXPR
, TREE_TYPE (*delta
),
10084 *delta
, integer_one_node
);
10088 gcc_unreachable ();
10091 *pfn
= fold_convert (TYPE_PTRMEMFUNC_FN_TYPE (type
), *pfn
);
10095 /* Return an expression for PFN from the pointer-to-member function
10099 pfn_from_ptrmemfunc (tree t
)
10101 if (TREE_CODE (t
) == PTRMEM_CST
)
10106 expand_ptrmemfunc_cst (t
, &delta
, &pfn
);
10111 return build_ptrmemfunc_access_expr (t
, pfn_identifier
);
10114 /* Return an expression for DELTA from the pointer-to-member function
10118 delta_from_ptrmemfunc (tree t
)
10120 if (TREE_CODE (t
) == PTRMEM_CST
)
10125 expand_ptrmemfunc_cst (t
, &delta
, &pfn
);
10130 return build_ptrmemfunc_access_expr (t
, delta_identifier
);
10133 /* Convert value RHS to type TYPE as preparation for an assignment to
10134 an lvalue of type TYPE. ERRTYPE indicates what kind of error the
10135 implicit conversion is. If FNDECL is non-NULL, we are doing the
10136 conversion in order to pass the PARMNUMth argument of FNDECL.
10137 If FNDECL is NULL, we are doing the conversion in function pointer
10138 argument passing, conversion in initialization, etc. */
10141 convert_for_assignment (tree type
, tree rhs
,
10142 impl_conv_rhs errtype
, tree fndecl
, int parmnum
,
10143 tsubst_flags_t complain
, int flags
)
10146 enum tree_code coder
;
10148 location_t rhs_loc
= cp_expr_loc_or_input_loc (rhs
);
10149 bool has_loc
= EXPR_LOCATION (rhs
) != UNKNOWN_LOCATION
;
10150 /* Strip NON_LVALUE_EXPRs since we aren't using as an lvalue,
10151 but preserve location wrappers. */
10152 if (TREE_CODE (rhs
) == NON_LVALUE_EXPR
10153 && !location_wrapper_p (rhs
))
10154 rhs
= TREE_OPERAND (rhs
, 0);
10156 /* Handle [dcl.init.list] direct-list-initialization from
10157 single element of enumeration with a fixed underlying type. */
10158 if (is_direct_enum_init (type
, rhs
))
10160 tree elt
= CONSTRUCTOR_ELT (rhs
, 0)->value
;
10161 if (check_narrowing (ENUM_UNDERLYING_TYPE (type
), elt
, complain
))
10163 warning_sentinel
w (warn_useless_cast
);
10164 warning_sentinel
w2 (warn_ignored_qualifiers
);
10165 rhs
= cp_build_c_cast (rhs_loc
, type
, elt
, complain
);
10168 rhs
= error_mark_node
;
10171 rhstype
= TREE_TYPE (rhs
);
10172 coder
= TREE_CODE (rhstype
);
10174 if (VECTOR_TYPE_P (type
) && coder
== VECTOR_TYPE
10175 && vector_types_convertible_p (type
, rhstype
, true))
10177 rhs
= mark_rvalue_use (rhs
);
10178 return convert (type
, rhs
);
10181 if (rhs
== error_mark_node
|| rhstype
== error_mark_node
)
10182 return error_mark_node
;
10183 if (TREE_CODE (rhs
) == TREE_LIST
&& TREE_VALUE (rhs
) == error_mark_node
)
10184 return error_mark_node
;
10186 /* The RHS of an assignment cannot have void type. */
10187 if (coder
== VOID_TYPE
)
10189 if (complain
& tf_error
)
10190 error_at (rhs_loc
, "void value not ignored as it ought to be");
10191 return error_mark_node
;
10194 if (c_dialect_objc ())
10198 tree rname
= fndecl
;
10209 selector
= objc_message_selector ();
10211 if (selector
&& parmno
> 1)
10218 if (objc_compare_types (type
, rhstype
, parmno
, rname
))
10220 rhs
= mark_rvalue_use (rhs
);
10221 return convert (type
, rhs
);
10227 The expression is implicitly converted (clause _conv_) to the
10228 cv-unqualified type of the left operand.
10230 We allow bad conversions here because by the time we get to this point
10231 we are committed to doing the conversion. If we end up doing a bad
10232 conversion, convert_like will complain. */
10233 if (!can_convert_arg_bad (type
, rhstype
, rhs
, flags
, complain
))
10235 /* When -Wno-pmf-conversions is use, we just silently allow
10236 conversions from pointers-to-members to plain pointers. If
10237 the conversion doesn't work, cp_convert will complain. */
10239 && TYPE_PTR_P (type
)
10240 && TYPE_PTRMEMFUNC_P (rhstype
))
10241 rhs
= cp_convert (strip_top_quals (type
), rhs
, complain
);
10244 if (complain
& tf_error
)
10246 /* If the right-hand side has unknown type, then it is an
10247 overloaded function. Call instantiate_type to get error
10249 if (rhstype
== unknown_type_node
)
10251 tree r
= instantiate_type (type
, rhs
, tf_warning_or_error
);
10252 /* -fpermissive might allow this; recurse. */
10253 if (!seen_error ())
10254 return convert_for_assignment (type
, r
, errtype
, fndecl
,
10255 parmnum
, complain
, flags
);
10258 complain_about_bad_argument (rhs_loc
,
10263 range_label_for_type_mismatch
label (rhstype
, type
);
10264 gcc_rich_location
richloc (rhs_loc
, has_loc
? &label
: NULL
);
10267 case ICR_DEFAULT_ARGUMENT
:
10268 error_at (&richloc
,
10269 "cannot convert %qH to %qI in default argument",
10273 error_at (&richloc
,
10274 "cannot convert %qH to %qI in argument passing",
10277 case ICR_CONVERTING
:
10278 error_at (&richloc
, "cannot convert %qH to %qI",
10282 error_at (&richloc
,
10283 "cannot convert %qH to %qI in initialization",
10287 error_at (&richloc
, "cannot convert %qH to %qI in return",
10291 error_at (&richloc
,
10292 "cannot convert %qH to %qI in assignment",
10299 if (TYPE_PTR_P (rhstype
)
10300 && TYPE_PTR_P (type
)
10301 && CLASS_TYPE_P (TREE_TYPE (rhstype
))
10302 && CLASS_TYPE_P (TREE_TYPE (type
))
10303 && !COMPLETE_TYPE_P (TREE_TYPE (rhstype
)))
10304 inform (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL
10305 (TREE_TYPE (rhstype
))),
10306 "class type %qT is incomplete", TREE_TYPE (rhstype
));
10308 return error_mark_node
;
10311 if (warn_suggest_attribute_format
)
10313 const enum tree_code codel
= TREE_CODE (type
);
10314 if ((codel
== POINTER_TYPE
|| codel
== REFERENCE_TYPE
)
10316 && check_missing_format_attribute (type
, rhstype
)
10317 && (complain
& tf_warning
))
10321 case ICR_DEFAULT_ARGUMENT
:
10323 warning (OPT_Wsuggest_attribute_format
,
10324 "parameter %qP of %qD might be a candidate "
10325 "for a format attribute", parmnum
, fndecl
);
10327 warning (OPT_Wsuggest_attribute_format
,
10328 "parameter might be a candidate "
10329 "for a format attribute");
10331 case ICR_CONVERTING
:
10332 warning (OPT_Wsuggest_attribute_format
,
10333 "target of conversion might be a candidate "
10334 "for a format attribute");
10337 warning (OPT_Wsuggest_attribute_format
,
10338 "target of initialization might be a candidate "
10339 "for a format attribute");
10342 warning (OPT_Wsuggest_attribute_format
,
10343 "return type might be a candidate "
10344 "for a format attribute");
10347 warning (OPT_Wsuggest_attribute_format
,
10348 "left-hand side of assignment might be a candidate "
10349 "for a format attribute");
10356 /* If -Wparentheses, warn about a = b = c when a has type bool and b
10358 if (warn_parentheses
10359 && TREE_CODE (type
) == BOOLEAN_TYPE
10360 && TREE_CODE (rhs
) == MODIFY_EXPR
10361 && !warning_suppressed_p (rhs
, OPT_Wparentheses
)
10362 && TREE_CODE (TREE_TYPE (rhs
)) != BOOLEAN_TYPE
10363 && (complain
& tf_warning
)
10364 && warning_at (rhs_loc
, OPT_Wparentheses
,
10365 "suggest parentheses around assignment used as "
10367 suppress_warning (rhs
, OPT_Wparentheses
);
10369 if (complain
& tf_warning
)
10370 warn_for_address_or_pointer_of_packed_member (type
, rhs
);
10372 return perform_implicit_conversion_flags (strip_top_quals (type
), rhs
,
10376 /* Convert RHS to be of type TYPE.
10377 If EXP is nonzero, it is the target of the initialization.
10378 ERRTYPE indicates what kind of error the implicit conversion is.
10380 Two major differences between the behavior of
10381 `convert_for_assignment' and `convert_for_initialization'
10382 are that references are bashed in the former, while
10383 copied in the latter, and aggregates are assigned in
10384 the former (operator=) while initialized in the
10387 If using constructor make sure no conversion operator exists, if one does
10388 exist, an ambiguity exists. */
10391 convert_for_initialization (tree exp
, tree type
, tree rhs
, int flags
,
10392 impl_conv_rhs errtype
, tree fndecl
, int parmnum
,
10393 tsubst_flags_t complain
)
10395 enum tree_code codel
= TREE_CODE (type
);
10397 enum tree_code coder
;
10399 /* build_c_cast puts on a NOP_EXPR to make the result not an lvalue.
10400 Strip such NOP_EXPRs, since RHS is used in non-lvalue context. */
10401 if (TREE_CODE (rhs
) == NOP_EXPR
10402 && TREE_TYPE (rhs
) == TREE_TYPE (TREE_OPERAND (rhs
, 0))
10403 && codel
!= REFERENCE_TYPE
)
10404 rhs
= TREE_OPERAND (rhs
, 0);
10406 if (type
== error_mark_node
10407 || rhs
== error_mark_node
10408 || (TREE_CODE (rhs
) == TREE_LIST
&& TREE_VALUE (rhs
) == error_mark_node
))
10409 return error_mark_node
;
10411 if (MAYBE_CLASS_TYPE_P (non_reference (type
)))
10413 else if ((TREE_CODE (TREE_TYPE (rhs
)) == ARRAY_TYPE
10414 && TREE_CODE (type
) != ARRAY_TYPE
10415 && (!TYPE_REF_P (type
)
10416 || TREE_CODE (TREE_TYPE (type
)) != ARRAY_TYPE
))
10417 || (TREE_CODE (TREE_TYPE (rhs
)) == FUNCTION_TYPE
10418 && !TYPE_REFFN_P (type
))
10419 || TREE_CODE (TREE_TYPE (rhs
)) == METHOD_TYPE
)
10420 rhs
= decay_conversion (rhs
, complain
);
10422 rhstype
= TREE_TYPE (rhs
);
10423 coder
= TREE_CODE (rhstype
);
10425 if (coder
== ERROR_MARK
)
10426 return error_mark_node
;
10428 /* We accept references to incomplete types, so we can
10429 return here before checking if RHS is of complete type. */
10431 if (codel
== REFERENCE_TYPE
)
10433 auto_diagnostic_group d
;
10434 /* This should eventually happen in convert_arguments. */
10435 int savew
= 0, savee
= 0;
10438 savew
= warningcount
+ werrorcount
, savee
= errorcount
;
10439 rhs
= initialize_reference (type
, rhs
, flags
, complain
);
10442 && (warningcount
+ werrorcount
> savew
|| errorcount
> savee
))
10443 inform (get_fndecl_argument_location (fndecl
, parmnum
),
10444 "in passing argument %P of %qD", parmnum
, fndecl
);
10449 exp
= require_complete_type (exp
, complain
);
10450 if (exp
== error_mark_node
)
10451 return error_mark_node
;
10453 type
= complete_type (type
);
10455 if (DIRECT_INIT_EXPR_P (type
, rhs
))
10456 /* Don't try to do copy-initialization if we already have
10457 direct-initialization. */
10460 if (MAYBE_CLASS_TYPE_P (type
))
10461 return perform_implicit_conversion_flags (type
, rhs
, complain
, flags
);
10463 return convert_for_assignment (type
, rhs
, errtype
, fndecl
, parmnum
,
10467 /* If RETVAL is the address of, or a reference to, a local variable or
10468 temporary give an appropriate warning and return true. */
10471 maybe_warn_about_returning_address_of_local (tree retval
, location_t loc
)
10473 tree valtype
= TREE_TYPE (DECL_RESULT (current_function_decl
));
10474 tree whats_returned
= fold_for_warn (retval
);
10476 loc
= cp_expr_loc_or_input_loc (retval
);
10480 if (TREE_CODE (whats_returned
) == COMPOUND_EXPR
)
10481 whats_returned
= TREE_OPERAND (whats_returned
, 1);
10482 else if (CONVERT_EXPR_P (whats_returned
)
10483 || TREE_CODE (whats_returned
) == NON_LVALUE_EXPR
)
10484 whats_returned
= TREE_OPERAND (whats_returned
, 0);
10489 if (TREE_CODE (whats_returned
) == TARGET_EXPR
10490 && is_std_init_list (TREE_TYPE (whats_returned
)))
10492 tree init
= TARGET_EXPR_INITIAL (whats_returned
);
10493 if (TREE_CODE (init
) == CONSTRUCTOR
)
10494 /* Pull out the array address. */
10495 whats_returned
= CONSTRUCTOR_ELT (init
, 0)->value
;
10496 else if (TREE_CODE (init
) == INDIRECT_REF
)
10497 /* The source of a trivial copy looks like *(T*)&var. */
10498 whats_returned
= TREE_OPERAND (init
, 0);
10501 STRIP_NOPS (whats_returned
);
10504 /* As a special case, we handle a call to std::move or std::forward. */
10505 if (TREE_CODE (whats_returned
) == CALL_EXPR
10506 && (is_std_move_p (whats_returned
)
10507 || is_std_forward_p (whats_returned
)))
10509 tree arg
= CALL_EXPR_ARG (whats_returned
, 0);
10510 return maybe_warn_about_returning_address_of_local (arg
, loc
);
10513 if (TREE_CODE (whats_returned
) != ADDR_EXPR
)
10515 whats_returned
= TREE_OPERAND (whats_returned
, 0);
10517 while (TREE_CODE (whats_returned
) == COMPONENT_REF
10518 || TREE_CODE (whats_returned
) == ARRAY_REF
)
10519 whats_returned
= TREE_OPERAND (whats_returned
, 0);
10521 if (TREE_CODE (whats_returned
) == AGGR_INIT_EXPR
10522 || TREE_CODE (whats_returned
) == TARGET_EXPR
)
10524 if (TYPE_REF_P (valtype
))
10525 warning_at (loc
, OPT_Wreturn_local_addr
,
10526 "returning reference to temporary");
10527 else if (is_std_init_list (valtype
))
10528 warning_at (loc
, OPT_Winit_list_lifetime
,
10529 "returning temporary %<initializer_list%> does not extend "
10530 "the lifetime of the underlying array");
10534 STRIP_ANY_LOCATION_WRAPPER (whats_returned
);
10536 if (DECL_P (whats_returned
)
10537 && DECL_NAME (whats_returned
)
10538 && DECL_FUNCTION_SCOPE_P (whats_returned
)
10539 && !is_capture_proxy (whats_returned
)
10540 && !(TREE_STATIC (whats_returned
)
10541 || TREE_PUBLIC (whats_returned
)))
10543 if (VAR_P (whats_returned
)
10544 && DECL_DECOMPOSITION_P (whats_returned
)
10545 && DECL_DECOMP_BASE (whats_returned
)
10546 && DECL_HAS_VALUE_EXPR_P (whats_returned
))
10548 /* When returning address of a structured binding, if the structured
10549 binding is not a reference, continue normally, if it is a
10550 reference, recurse on the initializer of the structured
10552 tree base
= DECL_DECOMP_BASE (whats_returned
);
10553 if (TYPE_REF_P (TREE_TYPE (base
)))
10555 if (tree init
= DECL_INITIAL (base
))
10556 return maybe_warn_about_returning_address_of_local (init
, loc
);
10562 auto_diagnostic_group d
;
10563 if (TYPE_REF_P (valtype
))
10564 w
= warning_at (loc
, OPT_Wreturn_local_addr
,
10565 "reference to local variable %qD returned",
10567 else if (is_std_init_list (valtype
))
10568 w
= warning_at (loc
, OPT_Winit_list_lifetime
,
10569 "returning local %<initializer_list%> variable %qD "
10570 "does not extend the lifetime of the underlying array",
10572 else if (POINTER_TYPE_P (valtype
)
10573 && TREE_CODE (whats_returned
) == LABEL_DECL
)
10574 w
= warning_at (loc
, OPT_Wreturn_local_addr
,
10575 "address of label %qD returned",
10577 else if (POINTER_TYPE_P (valtype
))
10578 w
= warning_at (loc
, OPT_Wreturn_local_addr
,
10579 "address of local variable %qD returned",
10582 inform (DECL_SOURCE_LOCATION (whats_returned
),
10590 /* Returns true if DECL is in the std namespace. */
10593 decl_in_std_namespace_p (tree decl
)
10597 decl
= decl_namespace_context (decl
);
10598 if (DECL_NAMESPACE_STD_P (decl
))
10600 /* Allow inline namespaces inside of std namespace, e.g. with
10601 --enable-symvers=gnu-versioned-namespace std::forward would be
10602 actually std::_8::forward. */
10603 if (!DECL_NAMESPACE_INLINE_P (decl
))
10605 decl
= CP_DECL_CONTEXT (decl
);
10610 /* Returns true if FN, a CALL_EXPR, is a call to std::forward. */
10613 is_std_forward_p (tree fn
)
10615 /* std::forward only takes one argument. */
10616 if (call_expr_nargs (fn
) != 1)
10619 tree fndecl
= cp_get_callee_fndecl_nofold (fn
);
10620 if (!decl_in_std_namespace_p (fndecl
))
10623 tree name
= DECL_NAME (fndecl
);
10624 return name
&& id_equal (name
, "forward");
10627 /* Returns true if FN, a CALL_EXPR, is a call to std::move. */
10630 is_std_move_p (tree fn
)
10632 /* std::move only takes one argument. */
10633 if (call_expr_nargs (fn
) != 1)
10636 tree fndecl
= cp_get_callee_fndecl_nofold (fn
);
10637 if (!decl_in_std_namespace_p (fndecl
))
10640 tree name
= DECL_NAME (fndecl
);
10641 return name
&& id_equal (name
, "move");
10644 /* Returns true if RETVAL is a good candidate for the NRVO as per
10645 [class.copy.elision]. FUNCTYPE is the type the function is declared
10649 can_do_nrvo_p (tree retval
, tree functype
)
10651 if (functype
== error_mark_node
)
10654 STRIP_ANY_LOCATION_WRAPPER (retval
);
10655 tree result
= DECL_RESULT (current_function_decl
);
10656 return (retval
!= NULL_TREE
10657 && !processing_template_decl
10658 /* Must be a local, automatic variable. */
10660 && DECL_CONTEXT (retval
) == current_function_decl
10661 && !TREE_STATIC (retval
)
10662 /* And not a lambda or anonymous union proxy. */
10663 && !DECL_HAS_VALUE_EXPR_P (retval
)
10664 && (DECL_ALIGN (retval
) <= DECL_ALIGN (result
))
10665 /* The cv-unqualified type of the returned value must be the
10666 same as the cv-unqualified return type of the
10668 && same_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (retval
)),
10669 TYPE_MAIN_VARIANT (functype
))
10670 /* And the returned value must be non-volatile. */
10671 && !TYPE_VOLATILE (TREE_TYPE (retval
)));
10674 /* True if we would like to perform NRVO, i.e. can_do_nrvo_p is true and we
10675 would otherwise return in memory. */
10678 want_nrvo_p (tree retval
, tree functype
)
10680 return (can_do_nrvo_p (retval
, functype
)
10681 && aggregate_value_p (functype
, current_function_decl
));
10684 /* Like can_do_nrvo_p, but we check if we're trying to move a class
10688 can_elide_copy_prvalue_p (tree retval
, tree functype
)
10690 if (functype
== error_mark_node
)
10693 STRIP_ANY_LOCATION_WRAPPER (retval
);
10694 return (retval
!= NULL_TREE
10695 && !glvalue_p (retval
)
10696 && same_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (retval
)),
10697 TYPE_MAIN_VARIANT (functype
))
10698 && !TYPE_VOLATILE (TREE_TYPE (retval
)));
10701 /* If we should treat RETVAL, an expression being returned, as if it were
10702 designated by an rvalue, returns it adjusted accordingly; otherwise, returns
10703 NULL_TREE. See [class.copy.elision]. RETURN_P is true if this is a return
10704 context (rather than throw). */
10707 treat_lvalue_as_rvalue_p (tree expr
, bool return_p
)
10709 if (cxx_dialect
== cxx98
)
10712 tree retval
= expr
;
10713 STRIP_ANY_LOCATION_WRAPPER (retval
);
10714 if (REFERENCE_REF_P (retval
))
10715 retval
= TREE_OPERAND (retval
, 0);
10717 /* An implicitly movable entity is a variable of automatic storage duration
10718 that is either a non-volatile object or (C++20) an rvalue reference to a
10719 non-volatile object type. */
10720 if (!(((VAR_P (retval
) && !DECL_HAS_VALUE_EXPR_P (retval
))
10721 || TREE_CODE (retval
) == PARM_DECL
)
10722 && !TREE_STATIC (retval
)
10723 && !CP_TYPE_VOLATILE_P (non_reference (TREE_TYPE (retval
)))
10724 && (TREE_CODE (TREE_TYPE (retval
)) != REFERENCE_TYPE
10725 || (cxx_dialect
>= cxx20
10726 && TYPE_REF_IS_RVALUE (TREE_TYPE (retval
))))))
10729 /* If the expression in a return or co_return statement is a (possibly
10730 parenthesized) id-expression that names an implicitly movable entity
10731 declared in the body or parameter-declaration-clause of the innermost
10732 enclosing function or lambda-expression, */
10733 if (DECL_CONTEXT (retval
) != current_function_decl
)
10737 expr
= move (expr
);
10738 if (expr
== error_mark_node
)
10740 return set_implicit_rvalue_p (expr
);
10743 /* if the operand of a throw-expression is a (possibly parenthesized)
10744 id-expression that names an implicitly movable entity whose scope does not
10745 extend beyond the compound-statement of the innermost try-block or
10746 function-try-block (if any) whose compound-statement or ctor-initializer
10747 encloses the throw-expression, */
10749 /* C++20 added move on throw of parms. */
10750 if (TREE_CODE (retval
) == PARM_DECL
&& cxx_dialect
< cxx20
)
10753 for (cp_binding_level
*b
= current_binding_level
;
10754 ; b
= b
->level_chain
)
10756 for (tree decl
= b
->names
; decl
; decl
= TREE_CHAIN (decl
))
10757 if (decl
== retval
)
10758 return set_implicit_rvalue_p (move (expr
));
10759 if (b
->kind
== sk_function_parms
|| b
->kind
== sk_try
)
10764 /* Warn about dubious usage of std::move (in a return statement, if RETURN_P
10765 is true). EXPR is the std::move expression; TYPE is the type of the object
10766 being initialized. */
10769 maybe_warn_pessimizing_move (tree expr
, tree type
, bool return_p
)
10771 if (!(warn_pessimizing_move
|| warn_redundant_move
))
10774 const location_t loc
= cp_expr_loc_or_input_loc (expr
);
10776 /* C++98 doesn't know move. */
10777 if (cxx_dialect
< cxx11
)
10780 /* Wait until instantiation time, since we can't gauge if we should do
10781 the NRVO until then. */
10782 if (processing_template_decl
)
10785 /* This is only interesting for class types. */
10786 if (!CLASS_TYPE_P (type
))
10789 bool wrapped_p
= false;
10790 /* A a = std::move (A()); */
10791 if (TREE_CODE (expr
) == TREE_LIST
)
10793 if (list_length (expr
) == 1)
10795 expr
= TREE_VALUE (expr
);
10801 /* A a = {std::move (A())};
10802 A a{std::move (A())}; */
10803 else if (TREE_CODE (expr
) == CONSTRUCTOR
)
10805 if (CONSTRUCTOR_NELTS (expr
) == 1)
10807 expr
= CONSTRUCTOR_ELT (expr
, 0)->value
;
10814 /* First, check if this is a call to std::move. */
10815 if (!REFERENCE_REF_P (expr
)
10816 || TREE_CODE (TREE_OPERAND (expr
, 0)) != CALL_EXPR
)
10818 tree fn
= TREE_OPERAND (expr
, 0);
10819 if (!is_std_move_p (fn
))
10821 tree arg
= CALL_EXPR_ARG (fn
, 0);
10822 if (TREE_CODE (arg
) != NOP_EXPR
)
10824 /* If we're looking at *std::move<T&> ((T &) &arg), do the pessimizing N/RVO
10825 and implicitly-movable warnings. */
10826 if (TREE_CODE (TREE_OPERAND (arg
, 0)) == ADDR_EXPR
)
10828 arg
= TREE_OPERAND (arg
, 0);
10829 arg
= TREE_OPERAND (arg
, 0);
10830 arg
= convert_from_reference (arg
);
10831 if (can_elide_copy_prvalue_p (arg
, type
))
10833 auto_diagnostic_group d
;
10834 if (warning_at (loc
, OPT_Wpessimizing_move
,
10835 "moving a temporary object prevents copy elision"))
10836 inform (loc
, "remove %<std::move%> call");
10838 /* The rest of the warnings is only relevant for when we are returning
10839 from a function. */
10844 /* Warn if we could do copy elision were it not for the move. */
10845 if (can_do_nrvo_p (arg
, type
))
10847 auto_diagnostic_group d
;
10848 if (!warning_suppressed_p (expr
, OPT_Wpessimizing_move
)
10849 && warning_at (loc
, OPT_Wpessimizing_move
,
10850 "moving a local object in a return statement "
10851 "prevents copy elision"))
10852 inform (loc
, "remove %<std::move%> call");
10854 /* Warn if the move is redundant. It is redundant when we would
10855 do maybe-rvalue overload resolution even without std::move. */
10856 else if (warn_redundant_move
10857 /* This doesn't apply for return {std::move (t)};. */
10859 && !warning_suppressed_p (expr
, OPT_Wredundant_move
)
10860 && (moved
= treat_lvalue_as_rvalue_p (arg
, /*return*/true)))
10862 /* Make sure that overload resolution would actually succeed
10863 if we removed the std::move call. */
10864 tree t
= convert_for_initialization (NULL_TREE
, type
,
10867 | LOOKUP_ONLYCONVERTING
),
10868 ICR_RETURN
, NULL_TREE
, 0,
10870 /* If this worked, implicit rvalue would work, so the call to
10871 std::move is redundant. */
10872 if (t
!= error_mark_node
)
10874 auto_diagnostic_group d
;
10875 if (warning_at (loc
, OPT_Wredundant_move
,
10876 "redundant move in return statement"))
10877 inform (loc
, "remove %<std::move%> call");
10881 /* Also try to warn about redundant std::move in code such as
10884 return std::move(t);
10886 for which EXPR will be something like
10887 *std::move<const T&> ((const struct T &) (const struct T *) t)
10888 and where the std::move does nothing if T does not have a T(const T&&)
10889 constructor, because the argument is const. It will not use T(T&&)
10890 because that would mean losing the const. */
10891 else if (warn_redundant_move
10892 && !warning_suppressed_p (expr
, OPT_Wredundant_move
)
10893 && TYPE_REF_P (TREE_TYPE (arg
))
10894 && CP_TYPE_CONST_P (TREE_TYPE (TREE_TYPE (arg
))))
10896 tree rtype
= TREE_TYPE (TREE_TYPE (arg
));
10897 if (!same_type_ignoring_top_level_qualifiers_p (rtype
, type
))
10899 /* Check for the unlikely case there's T(const T&&) (we don't care if
10901 for (tree fn
: ovl_range (CLASSTYPE_CONSTRUCTORS (rtype
)))
10902 if (move_fn_p (fn
))
10904 tree t
= TREE_VALUE (FUNCTION_FIRST_USER_PARMTYPE (fn
));
10905 if (UNLIKELY (CP_TYPE_CONST_P (TREE_TYPE (t
))))
10908 auto_diagnostic_group d
;
10910 ? warning_at (loc
, OPT_Wredundant_move
,
10911 "redundant move in return statement")
10912 : warning_at (loc
, OPT_Wredundant_move
,
10913 "redundant move in initialization"))
10914 inform (loc
, "remove %<std::move%> call");
10918 /* Check that returning RETVAL from the current function is valid.
10919 Return an expression explicitly showing all conversions required to
10920 change RETVAL into the function return type, and to assign it to
10921 the DECL_RESULT for the function. Set *NO_WARNING to true if
10922 code reaches end of non-void function warning shouldn't be issued
10923 on this RETURN_EXPR. Set *DANGLING to true if code returns the
10924 address of a local variable. */
10927 check_return_expr (tree retval
, bool *no_warning
, bool *dangling
)
10930 /* The type actually returned by the function. */
10932 /* The type the function is declared to return, or void if
10933 the declared type is incomplete. */
10935 int fn_returns_value_p
;
10936 location_t loc
= cp_expr_loc_or_input_loc (retval
);
10938 *no_warning
= false;
10941 /* A `volatile' function is one that isn't supposed to return, ever.
10942 (This is a G++ extension, used to get better code for functions
10943 that call the `volatile' function.) */
10944 if (TREE_THIS_VOLATILE (current_function_decl
))
10945 warning (0, "function declared %<noreturn%> has a %<return%> statement");
10947 /* Check for various simple errors. */
10948 if (DECL_DESTRUCTOR_P (current_function_decl
))
10951 error_at (loc
, "returning a value from a destructor");
10953 if (targetm
.cxx
.cdtor_returns_this () && !processing_template_decl
)
10954 retval
= current_class_ptr
;
10958 else if (DECL_CONSTRUCTOR_P (current_function_decl
))
10960 if (in_function_try_handler
)
10961 /* If a return statement appears in a handler of the
10962 function-try-block of a constructor, the program is ill-formed. */
10963 error ("cannot return from a handler of a function-try-block of a constructor");
10965 /* You can't return a value from a constructor. */
10966 error_at (loc
, "returning a value from a constructor");
10968 if (targetm
.cxx
.cdtor_returns_this () && !processing_template_decl
)
10969 retval
= current_class_ptr
;
10974 const tree saved_retval
= retval
;
10976 if (processing_template_decl
)
10978 current_function_returns_value
= 1;
10980 if (check_for_bare_parameter_packs (retval
))
10981 return error_mark_node
;
10983 /* If one of the types might be void, we can't tell whether we're
10984 returning a value. */
10985 if ((WILDCARD_TYPE_P (TREE_TYPE (DECL_RESULT (current_function_decl
)))
10986 && !FNDECL_USED_AUTO (current_function_decl
))
10987 || (retval
!= NULL_TREE
10988 && (TREE_TYPE (retval
) == NULL_TREE
10989 || WILDCARD_TYPE_P (TREE_TYPE (retval
)))))
10993 functype
= TREE_TYPE (TREE_TYPE (current_function_decl
));
10995 /* Deduce auto return type from a return statement. */
10996 if (FNDECL_USED_AUTO (current_function_decl
))
10998 tree pattern
= DECL_SAVED_AUTO_RETURN_TYPE (current_function_decl
);
11002 if (!retval
&& !is_auto (pattern
))
11004 /* Give a helpful error message. */
11005 error ("return-statement with no value, in function returning %qT",
11007 inform (input_location
, "only plain %<auto%> return type can be "
11008 "deduced to %<void%>");
11009 type
= error_mark_node
;
11011 else if (retval
&& BRACE_ENCLOSED_INITIALIZER_P (retval
))
11013 error ("returning initializer list");
11014 type
= error_mark_node
;
11019 retval
= void_node
;
11020 auto_node
= type_uses_auto (pattern
);
11021 type
= do_auto_deduction (pattern
, retval
, auto_node
,
11022 tf_warning_or_error
, adc_return_type
);
11025 if (type
== error_mark_node
)
11027 else if (functype
== pattern
)
11028 apply_deduced_return_type (current_function_decl
, type
);
11029 else if (!same_type_p (type
, functype
))
11031 if (LAMBDA_FUNCTION_P (current_function_decl
))
11032 error_at (loc
, "inconsistent types %qT and %qT deduced for "
11033 "lambda return type", functype
, type
);
11035 error_at (loc
, "inconsistent deduction for auto return type: "
11036 "%qT and then %qT", functype
, type
);
11041 result
= DECL_RESULT (current_function_decl
);
11042 valtype
= TREE_TYPE (result
);
11043 gcc_assert (valtype
!= NULL_TREE
);
11044 fn_returns_value_p
= !VOID_TYPE_P (valtype
);
11046 /* Check for a return statement with no return value in a function
11047 that's supposed to return a value. */
11048 if (!retval
&& fn_returns_value_p
)
11050 if (functype
!= error_mark_node
)
11051 permerror (input_location
, "return-statement with no value, in "
11052 "function returning %qT", valtype
);
11053 /* Remember that this function did return. */
11054 current_function_returns_value
= 1;
11055 /* And signal caller that TREE_NO_WARNING should be set on the
11056 RETURN_EXPR to avoid control reaches end of non-void function
11057 warnings in tree-cfg.cc. */
11058 *no_warning
= true;
11060 /* Check for a return statement with a value in a function that
11061 isn't supposed to return a value. */
11062 else if (retval
&& !fn_returns_value_p
)
11064 if (VOID_TYPE_P (TREE_TYPE (retval
)))
11065 /* You can return a `void' value from a function of `void'
11066 type. In that case, we have to evaluate the expression for
11067 its side-effects. */
11068 finish_expr_stmt (retval
);
11069 else if (retval
!= error_mark_node
)
11070 permerror (loc
, "return-statement with a value, in function "
11071 "returning %qT", valtype
);
11072 current_function_returns_null
= 1;
11074 /* There's really no value to return, after all. */
11078 /* Remember that this function can sometimes return without a
11080 current_function_returns_null
= 1;
11082 /* Remember that this function did return a value. */
11083 current_function_returns_value
= 1;
11085 /* Check for erroneous operands -- but after giving ourselves a
11086 chance to provide an error about returning a value from a void
11088 if (error_operand_p (retval
))
11090 current_function_return_value
= error_mark_node
;
11091 return error_mark_node
;
11094 /* Only operator new(...) throw(), can return NULL [expr.new/13]. */
11095 if (IDENTIFIER_NEW_OP_P (DECL_NAME (current_function_decl
))
11096 && !TYPE_NOTHROW_P (TREE_TYPE (current_function_decl
))
11097 && ! flag_check_new
11098 && retval
&& null_ptr_cst_p (retval
))
11099 warning (0, "%<operator new%> must not return NULL unless it is "
11100 "declared %<throw()%> (or %<-fcheck-new%> is in effect)");
11102 /* Effective C++ rule 15. See also start_function. */
11104 && DECL_NAME (current_function_decl
) == assign_op_identifier
11105 && !type_dependent_expression_p (retval
))
11109 /* The function return type must be a reference to the current
11111 if (TYPE_REF_P (valtype
)
11112 && same_type_ignoring_top_level_qualifiers_p
11113 (TREE_TYPE (valtype
), TREE_TYPE (current_class_ref
)))
11115 /* Returning '*this' is obviously OK. */
11116 if (retval
== current_class_ref
)
11118 /* If we are calling a function whose return type is the same of
11119 the current class reference, it is ok. */
11120 else if (INDIRECT_REF_P (retval
)
11121 && TREE_CODE (TREE_OPERAND (retval
, 0)) == CALL_EXPR
)
11126 warning_at (loc
, OPT_Weffc__
,
11127 "%<operator=%> should return a reference to %<*this%>");
11130 if (dependent_type_p (functype
)
11131 || type_dependent_expression_p (retval
))
11134 /* We should not have changed the return value. */
11135 gcc_assert (retval
== saved_retval
);
11136 /* We don't know if this is an lvalue or rvalue use, but
11137 either way we can mark it as read. */
11138 mark_exp_read (retval
);
11142 /* The fabled Named Return Value optimization, as per [class.copy]/15:
11144 [...] For a function with a class return type, if the expression
11145 in the return statement is the name of a local object, and the cv-
11146 unqualified type of the local object is the same as the function
11147 return type, an implementation is permitted to omit creating the tem-
11148 porary object to hold the function return value [...]
11150 So, if this is a value-returning function that always returns the same
11151 local variable, remember it.
11153 We choose the first suitable variable even if the function sometimes
11154 returns something else, but only if the variable is out of scope at the
11155 other return sites, or else we run the risk of clobbering the variable we
11156 chose if the other returned expression uses the chosen variable somehow.
11158 We don't currently do this if the first return is a non-variable, as it
11159 would be complicated to determine whether an NRV selected later was in
11160 scope at the point of the earlier return. We also don't currently support
11161 multiple variables with non-overlapping scopes (53637).
11163 See finish_function and finalize_nrv for the rest of this optimization. */
11164 tree bare_retval
= NULL_TREE
;
11167 retval
= maybe_undo_parenthesized_ref (retval
);
11168 bare_retval
= tree_strip_any_location_wrapper (retval
);
11171 bool named_return_value_okay_p
= want_nrvo_p (bare_retval
, functype
);
11172 if (fn_returns_value_p
&& flag_elide_constructors
11173 && current_function_return_value
!= bare_retval
)
11175 if (named_return_value_okay_p
11176 && current_function_return_value
== NULL_TREE
)
11177 current_function_return_value
= bare_retval
;
11178 else if (current_function_return_value
11179 && VAR_P (current_function_return_value
)
11180 && DECL_NAME (current_function_return_value
)
11181 && !decl_in_scope_p (current_function_return_value
))
11183 /* The earlier NRV is out of scope at this point, so it's safe to
11184 leave it alone; the current return can't refer to it. */;
11185 if (named_return_value_okay_p
11186 && !warning_suppressed_p (current_function_decl
, OPT_Wnrvo
))
11188 warning (OPT_Wnrvo
, "not eliding copy on return from %qD",
11190 suppress_warning (current_function_decl
, OPT_Wnrvo
);
11195 if ((named_return_value_okay_p
11196 || (current_function_return_value
11197 && current_function_return_value
!= error_mark_node
))
11198 && !warning_suppressed_p (current_function_decl
, OPT_Wnrvo
))
11200 warning (OPT_Wnrvo
, "not eliding copy on return in %qD",
11201 current_function_decl
);
11202 suppress_warning (current_function_decl
, OPT_Wnrvo
);
11204 current_function_return_value
= error_mark_node
;
11208 /* We don't need to do any conversions when there's nothing being
11213 if (!named_return_value_okay_p
)
11214 maybe_warn_pessimizing_move (retval
, functype
, /*return_p*/true);
11216 /* Do any required conversions. */
11217 if (bare_retval
== result
|| DECL_CONSTRUCTOR_P (current_function_decl
))
11218 /* No conversions are required. */
11222 int flags
= LOOKUP_NORMAL
| LOOKUP_ONLYCONVERTING
;
11224 /* The functype's return type will have been set to void, if it
11225 was an incomplete type. Just treat this as 'return;' */
11226 if (VOID_TYPE_P (functype
))
11227 return error_mark_node
;
11229 if (processing_template_decl
)
11230 retval
= build_non_dependent_expr (retval
);
11232 /* Under C++11 [12.8/32 class.copy], a returned lvalue is sometimes
11233 treated as an rvalue for the purposes of overload resolution to
11234 favor move constructors over copy constructors.
11236 Note that these conditions are similar to, but not as strict as,
11237 the conditions for the named return value optimization. */
11238 bool converted
= false;
11240 /* Until C++23, this was only interesting for class type, but in C++23,
11241 we should do the below when we're converting rom/to a class/reference
11242 (a non-scalar type). */
11243 if ((cxx_dialect
< cxx23
11244 ? CLASS_TYPE_P (functype
)
11245 : !SCALAR_TYPE_P (functype
) || !SCALAR_TYPE_P (TREE_TYPE (retval
)))
11246 && (moved
= treat_lvalue_as_rvalue_p (retval
, /*return*/true)))
11247 /* In C++20 and earlier we treat the return value as an rvalue
11248 that can bind to lvalue refs. In C++23, such an expression is just
11249 an xvalue (see reference_binding). */
11252 /* The call in a (lambda) thunk needs no conversions. */
11253 if (TREE_CODE (retval
) == CALL_EXPR
11254 && call_from_lambda_thunk_p (retval
))
11257 /* First convert the value to the function's return type, then
11258 to the type of return value's location to handle the
11259 case that functype is smaller than the valtype. */
11261 retval
= convert_for_initialization
11262 (NULL_TREE
, functype
, retval
, flags
, ICR_RETURN
, NULL_TREE
, 0,
11263 tf_warning_or_error
);
11264 retval
= convert (valtype
, retval
);
11266 /* If the conversion failed, treat this just like `return;'. */
11267 if (retval
== error_mark_node
)
11269 /* We can't initialize a register from a AGGR_INIT_EXPR. */
11270 else if (! cfun
->returns_struct
11271 && TREE_CODE (retval
) == TARGET_EXPR
11272 && TREE_CODE (TREE_OPERAND (retval
, 1)) == AGGR_INIT_EXPR
)
11273 retval
= build2 (COMPOUND_EXPR
, TREE_TYPE (retval
), retval
,
11274 TREE_OPERAND (retval
, 0));
11275 else if (!processing_template_decl
11276 && maybe_warn_about_returning_address_of_local (retval
, loc
)
11277 && INDIRECT_TYPE_P (valtype
))
11281 /* A naive attempt to reduce the number of -Wdangling-reference false
11282 positives: if we know that this function can return a variable with
11283 static storage duration rather than one of its parameters, suppress
11285 if (warn_dangling_reference
11286 && TYPE_REF_P (functype
)
11288 && VAR_P (bare_retval
)
11289 && TREE_STATIC (bare_retval
))
11290 suppress_warning (current_function_decl
, OPT_Wdangling_reference
);
11292 if (processing_template_decl
)
11293 return saved_retval
;
11295 /* Actually copy the value returned into the appropriate location. */
11296 if (retval
&& retval
!= result
)
11298 /* If there's a postcondition for a scalar return value, wrap
11299 retval in a call to the postcondition function. */
11300 if (tree post
= apply_postcondition_to_return (retval
))
11302 retval
= cp_build_init_expr (result
, retval
);
11305 if (current_function_return_value
== bare_retval
)
11306 INIT_EXPR_NRV_P (retval
) = true;
11308 if (tree set
= maybe_set_retval_sentinel ())
11309 retval
= build2 (COMPOUND_EXPR
, void_type_node
, retval
, set
);
11311 /* If there's a postcondition for an aggregate return value, call the
11312 postcondition function after the return object is initialized. */
11313 if (tree post
= apply_postcondition_to_return (result
))
11314 retval
= build2 (COMPOUND_EXPR
, void_type_node
, retval
, post
);
11320 /* Returns nonzero if the pointer-type FROM can be converted to the
11321 pointer-type TO via a qualification conversion. If CONSTP is -1,
11322 then we return nonzero if the pointers are similar, and the
11323 cv-qualification signature of FROM is a proper subset of that of TO.
11325 If CONSTP is positive, then all outer pointers have been
11326 const-qualified. */
11329 comp_ptr_ttypes_real (tree to
, tree from
, int constp
)
11331 bool to_more_cv_qualified
= false;
11332 bool is_opaque_pointer
= false;
11334 for (; ; to
= TREE_TYPE (to
), from
= TREE_TYPE (from
))
11336 if (TREE_CODE (to
) != TREE_CODE (from
))
11339 if (TREE_CODE (from
) == OFFSET_TYPE
11340 && !same_type_p (TYPE_OFFSET_BASETYPE (from
),
11341 TYPE_OFFSET_BASETYPE (to
)))
11344 /* Const and volatile mean something different for function and
11345 array types, so the usual checks are not appropriate. We'll
11346 check the array type elements in further iterations. */
11347 if (!FUNC_OR_METHOD_TYPE_P (to
) && TREE_CODE (to
) != ARRAY_TYPE
)
11349 if (!at_least_as_qualified_p (to
, from
))
11352 if (!at_least_as_qualified_p (from
, to
))
11356 to_more_cv_qualified
= true;
11360 constp
&= TYPE_READONLY (to
);
11363 if (VECTOR_TYPE_P (to
))
11364 is_opaque_pointer
= vector_targets_convertible_p (to
, from
);
11366 /* P0388R4 allows a conversion from int[N] to int[] but not the
11367 other way round. When both arrays have bounds but they do
11368 not match, then no conversion is possible. */
11369 if (TREE_CODE (to
) == ARRAY_TYPE
11370 && !comp_array_types (to
, from
, bounds_first
, /*strict=*/false))
11373 if (!TYPE_PTR_P (to
)
11374 && !TYPE_PTRDATAMEM_P (to
)
11375 /* CWG 330 says we need to look through arrays. */
11376 && TREE_CODE (to
) != ARRAY_TYPE
)
11377 return ((constp
>= 0 || to_more_cv_qualified
)
11378 && (is_opaque_pointer
11379 || same_type_ignoring_top_level_qualifiers_p (to
, from
)));
11383 /* When comparing, say, char ** to char const **, this function takes
11384 the 'char *' and 'char const *'. Do not pass non-pointer/reference
11385 types to this function. */
11388 comp_ptr_ttypes (tree to
, tree from
)
11390 return comp_ptr_ttypes_real (to
, from
, 1);
11393 /* Returns true iff FNTYPE is a non-class type that involves
11394 error_mark_node. We can get FUNCTION_TYPE with buried error_mark_node
11395 if a parameter type is ill-formed. */
11398 error_type_p (const_tree type
)
11402 switch (TREE_CODE (type
))
11408 case REFERENCE_TYPE
:
11410 return error_type_p (TREE_TYPE (type
));
11412 case FUNCTION_TYPE
:
11414 if (error_type_p (TREE_TYPE (type
)))
11416 for (t
= TYPE_ARG_TYPES (type
); t
; t
= TREE_CHAIN (t
))
11417 if (error_type_p (TREE_VALUE (t
)))
11422 if (TYPE_PTRMEMFUNC_P (type
))
11423 return error_type_p (TYPE_PTRMEMFUNC_FN_TYPE (type
));
11431 /* Returns true if to and from are (possibly multi-level) pointers to the same
11432 type or inheritance-related types, regardless of cv-quals. */
11435 ptr_reasonably_similar (const_tree to
, const_tree from
)
11437 for (; ; to
= TREE_TYPE (to
), from
= TREE_TYPE (from
))
11439 /* Any target type is similar enough to void. */
11440 if (VOID_TYPE_P (to
))
11441 return !error_type_p (from
);
11442 if (VOID_TYPE_P (from
))
11443 return !error_type_p (to
);
11445 if (TREE_CODE (to
) != TREE_CODE (from
))
11448 if (TREE_CODE (from
) == OFFSET_TYPE
11449 && comptypes (TYPE_OFFSET_BASETYPE (to
),
11450 TYPE_OFFSET_BASETYPE (from
),
11451 COMPARE_BASE
| COMPARE_DERIVED
))
11454 if (VECTOR_TYPE_P (to
)
11455 && vector_types_convertible_p (to
, from
, false))
11458 if (TREE_CODE (to
) == INTEGER_TYPE
11459 && TYPE_PRECISION (to
) == TYPE_PRECISION (from
))
11462 if (TREE_CODE (to
) == FUNCTION_TYPE
)
11463 return !error_type_p (to
) && !error_type_p (from
);
11465 if (!TYPE_PTR_P (to
))
11467 /* When either type is incomplete avoid DERIVED_FROM_P,
11468 which may call complete_type (c++/57942). */
11469 bool b
= !COMPLETE_TYPE_P (to
) || !COMPLETE_TYPE_P (from
);
11471 (TYPE_MAIN_VARIANT (to
), TYPE_MAIN_VARIANT (from
),
11472 b
? COMPARE_STRICT
: COMPARE_BASE
| COMPARE_DERIVED
);
11477 /* Return true if TO and FROM (both of which are POINTER_TYPEs or
11478 pointer-to-member types) are the same, ignoring cv-qualification at
11479 all levels. CB says how we should behave when comparing array bounds. */
11482 comp_ptr_ttypes_const (tree to
, tree from
, compare_bounds_t cb
)
11484 bool is_opaque_pointer
= false;
11486 for (; ; to
= TREE_TYPE (to
), from
= TREE_TYPE (from
))
11488 if (TREE_CODE (to
) != TREE_CODE (from
))
11491 if (TREE_CODE (from
) == OFFSET_TYPE
11492 && same_type_p (TYPE_OFFSET_BASETYPE (from
),
11493 TYPE_OFFSET_BASETYPE (to
)))
11496 if (VECTOR_TYPE_P (to
))
11497 is_opaque_pointer
= vector_targets_convertible_p (to
, from
);
11499 if (TREE_CODE (to
) == ARRAY_TYPE
11500 /* Ignore cv-qualification, but if we see e.g. int[3] and int[4],
11502 && !comp_array_types (to
, from
, cb
, /*strict=*/false))
11505 /* CWG 330 says we need to look through arrays. */
11506 if (!TYPE_PTR_P (to
) && TREE_CODE (to
) != ARRAY_TYPE
)
11507 return (is_opaque_pointer
11508 || same_type_ignoring_top_level_qualifiers_p (to
, from
));
11512 /* Returns the type qualifiers for this type, including the qualifiers on the
11513 elements for an array type. */
11516 cp_type_quals (const_tree type
)
11519 /* This CONST_CAST is okay because strip_array_types returns its
11520 argument unmodified and we assign it to a const_tree. */
11521 type
= strip_array_types (CONST_CAST_TREE (type
));
11522 if (type
== error_mark_node
11523 /* Quals on a FUNCTION_TYPE are memfn quals. */
11524 || TREE_CODE (type
) == FUNCTION_TYPE
)
11525 return TYPE_UNQUALIFIED
;
11526 quals
= TYPE_QUALS (type
);
11527 /* METHOD and REFERENCE_TYPEs should never have quals. */
11528 gcc_assert ((TREE_CODE (type
) != METHOD_TYPE
11529 && !TYPE_REF_P (type
))
11530 || ((quals
& (TYPE_QUAL_CONST
|TYPE_QUAL_VOLATILE
))
11531 == TYPE_UNQUALIFIED
));
11535 /* Returns the function-ref-qualifier for TYPE */
11538 type_memfn_rqual (const_tree type
)
11540 gcc_assert (FUNC_OR_METHOD_TYPE_P (type
));
11542 if (!FUNCTION_REF_QUALIFIED (type
))
11543 return REF_QUAL_NONE
;
11544 else if (FUNCTION_RVALUE_QUALIFIED (type
))
11545 return REF_QUAL_RVALUE
;
11547 return REF_QUAL_LVALUE
;
11550 /* Returns the function-cv-quals for TYPE, which must be a FUNCTION_TYPE or
11554 type_memfn_quals (const_tree type
)
11556 if (TREE_CODE (type
) == FUNCTION_TYPE
)
11557 return TYPE_QUALS (type
);
11558 else if (TREE_CODE (type
) == METHOD_TYPE
)
11559 return cp_type_quals (class_of_this_parm (type
));
11561 gcc_unreachable ();
11564 /* Returns the FUNCTION_TYPE TYPE with its function-cv-quals changed to
11565 MEMFN_QUALS and its ref-qualifier to RQUAL. */
11568 apply_memfn_quals (tree type
, cp_cv_quals memfn_quals
, cp_ref_qualifier rqual
)
11570 /* Could handle METHOD_TYPE here if necessary. */
11571 gcc_assert (TREE_CODE (type
) == FUNCTION_TYPE
);
11572 if (TYPE_QUALS (type
) == memfn_quals
11573 && type_memfn_rqual (type
) == rqual
)
11576 /* This should really have a different TYPE_MAIN_VARIANT, but that gets
11578 tree result
= build_qualified_type (type
, memfn_quals
);
11579 return build_ref_qualified_type (result
, rqual
);
11582 /* Returns nonzero if TYPE is const or volatile. */
11585 cv_qualified_p (const_tree type
)
11587 int quals
= cp_type_quals (type
);
11588 return (quals
& (TYPE_QUAL_CONST
|TYPE_QUAL_VOLATILE
)) != 0;
11591 /* Returns nonzero if the TYPE contains a mutable member. */
11594 cp_has_mutable_p (const_tree type
)
11596 /* This CONST_CAST is okay because strip_array_types returns its
11597 argument unmodified and we assign it to a const_tree. */
11598 type
= strip_array_types (CONST_CAST_TREE(type
));
11600 return CLASS_TYPE_P (type
) && CLASSTYPE_HAS_MUTABLE (type
);
11603 /* Set TREE_READONLY and TREE_VOLATILE on DECL as indicated by the
11604 TYPE_QUALS. For a VAR_DECL, this may be an optimistic
11605 approximation. In particular, consider:
11608 struct S { int i; };
11609 const S s = { f(); }
11611 Here, we will make "s" as TREE_READONLY (because it is declared
11612 "const") -- only to reverse ourselves upon seeing that the
11613 initializer is non-constant. */
11616 cp_apply_type_quals_to_decl (int type_quals
, tree decl
)
11618 tree type
= TREE_TYPE (decl
);
11620 if (type
== error_mark_node
)
11623 if (TREE_CODE (decl
) == TYPE_DECL
)
11626 gcc_assert (!(TREE_CODE (type
) == FUNCTION_TYPE
11627 && type_quals
!= TYPE_UNQUALIFIED
));
11629 /* Avoid setting TREE_READONLY incorrectly. */
11630 /* We used to check TYPE_NEEDS_CONSTRUCTING here, but now a constexpr
11631 constructor can produce constant init, so rely on cp_finish_decl to
11632 clear TREE_READONLY if the variable has non-constant init. */
11634 /* If the type has (or might have) a mutable component, that component
11635 might be modified. */
11636 if (TYPE_HAS_MUTABLE_P (type
) || !COMPLETE_TYPE_P (type
))
11637 type_quals
&= ~TYPE_QUAL_CONST
;
11639 c_apply_type_quals_to_decl (type_quals
, decl
);
11642 /* Subroutine of casts_away_constness. Make T1 and T2 point at
11643 exemplar types such that casting T1 to T2 is casting away constness
11644 if and only if there is no implicit conversion from T1 to T2. */
11647 casts_away_constness_r (tree
*t1
, tree
*t2
, tsubst_flags_t complain
)
11652 /* [expr.const.cast]
11654 For multi-level pointer to members and multi-level mixed pointers
11655 and pointers to members (conv.qual), the "member" aspect of a
11656 pointer to member level is ignored when determining if a const
11657 cv-qualifier has been cast away. */
11658 /* [expr.const.cast]
11660 For two pointer types:
11662 X1 is T1cv1,1 * ... cv1,N * where T1 is not a pointer type
11663 X2 is T2cv2,1 * ... cv2,M * where T2 is not a pointer type
11666 casting from X1 to X2 casts away constness if, for a non-pointer
11667 type T there does not exist an implicit conversion (clause
11670 Tcv1,(N-K+1) * cv1,(N-K+2) * ... cv1,N *
11674 Tcv2,(M-K+1) * cv2,(M-K+2) * ... cv2,M *. */
11675 if ((!TYPE_PTR_P (*t1
) && !TYPE_PTRDATAMEM_P (*t1
))
11676 || (!TYPE_PTR_P (*t2
) && !TYPE_PTRDATAMEM_P (*t2
)))
11678 *t1
= cp_build_qualified_type (void_type_node
,
11679 cp_type_quals (*t1
));
11680 *t2
= cp_build_qualified_type (void_type_node
,
11681 cp_type_quals (*t2
));
11685 quals1
= cp_type_quals (*t1
);
11686 quals2
= cp_type_quals (*t2
);
11688 if (TYPE_PTRDATAMEM_P (*t1
))
11689 *t1
= TYPE_PTRMEM_POINTED_TO_TYPE (*t1
);
11691 *t1
= TREE_TYPE (*t1
);
11692 if (TYPE_PTRDATAMEM_P (*t2
))
11693 *t2
= TYPE_PTRMEM_POINTED_TO_TYPE (*t2
);
11695 *t2
= TREE_TYPE (*t2
);
11697 casts_away_constness_r (t1
, t2
, complain
);
11698 *t1
= build_pointer_type (*t1
);
11699 *t2
= build_pointer_type (*t2
);
11700 *t1
= cp_build_qualified_type (*t1
, quals1
);
11701 *t2
= cp_build_qualified_type (*t2
, quals2
);
11704 /* Returns nonzero if casting from TYPE1 to TYPE2 casts away
11707 ??? This function returns non-zero if casting away qualifiers not
11708 just const. We would like to return to the caller exactly which
11709 qualifiers are casted away to give more accurate diagnostics.
11713 casts_away_constness (tree t1
, tree t2
, tsubst_flags_t complain
)
11715 if (TYPE_REF_P (t2
))
11717 /* [expr.const.cast]
11719 Casting from an lvalue of type T1 to an lvalue of type T2
11720 using a reference cast casts away constness if a cast from an
11721 rvalue of type "pointer to T1" to the type "pointer to T2"
11722 casts away constness. */
11723 t1
= (TYPE_REF_P (t1
) ? TREE_TYPE (t1
) : t1
);
11724 return casts_away_constness (build_pointer_type (t1
),
11725 build_pointer_type (TREE_TYPE (t2
)),
11729 if (TYPE_PTRDATAMEM_P (t1
) && TYPE_PTRDATAMEM_P (t2
))
11730 /* [expr.const.cast]
11732 Casting from an rvalue of type "pointer to data member of X
11733 of type T1" to the type "pointer to data member of Y of type
11734 T2" casts away constness if a cast from an rvalue of type
11735 "pointer to T1" to the type "pointer to T2" casts away
11737 return casts_away_constness
11738 (build_pointer_type (TYPE_PTRMEM_POINTED_TO_TYPE (t1
)),
11739 build_pointer_type (TYPE_PTRMEM_POINTED_TO_TYPE (t2
)),
11742 /* Casting away constness is only something that makes sense for
11743 pointer or reference types. */
11744 if (!TYPE_PTR_P (t1
) || !TYPE_PTR_P (t2
))
11747 /* Top-level qualifiers don't matter. */
11748 t1
= TYPE_MAIN_VARIANT (t1
);
11749 t2
= TYPE_MAIN_VARIANT (t2
);
11750 casts_away_constness_r (&t1
, &t2
, complain
);
11751 if (!can_convert (t2
, t1
, complain
))
11757 /* If T is a REFERENCE_TYPE return the type to which T refers.
11758 Otherwise, return T itself. */
11761 non_reference (tree t
)
11763 if (t
&& TYPE_REF_P (t
))
11769 /* Return nonzero if REF is an lvalue valid for this language;
11770 otherwise, print an error message and return zero. USE says
11771 how the lvalue is being used and so selects the error message. */
11774 lvalue_or_else (tree ref
, enum lvalue_use use
, tsubst_flags_t complain
)
11776 cp_lvalue_kind kind
= lvalue_kind (ref
);
11778 if (kind
== clk_none
)
11780 if (complain
& tf_error
)
11781 lvalue_error (cp_expr_loc_or_input_loc (ref
), use
);
11784 else if (kind
& (clk_rvalueref
|clk_class
))
11786 if (!(complain
& tf_error
))
11788 /* Make this a permerror because we used to accept it. */
11789 permerror (cp_expr_loc_or_input_loc (ref
),
11790 "using rvalue as lvalue");
11795 /* Return true if a user-defined literal operator is a raw operator. */
11798 check_raw_literal_operator (const_tree decl
)
11800 tree argtypes
= TYPE_ARG_TYPES (TREE_TYPE (decl
));
11803 bool maybe_raw_p
= false;
11805 /* Count the number and type of arguments and check for ellipsis. */
11806 for (argtype
= argtypes
, arity
= 0;
11807 argtype
&& argtype
!= void_list_node
;
11808 ++arity
, argtype
= TREE_CHAIN (argtype
))
11810 tree t
= TREE_VALUE (argtype
);
11812 if (same_type_p (t
, const_string_type_node
))
11813 maybe_raw_p
= true;
11816 return false; /* Found ellipsis. */
11818 if (!maybe_raw_p
|| arity
!= 1)
11825 /* Return true if a user-defined literal operator has one of the allowed
11829 check_literal_operator_args (const_tree decl
,
11830 bool *long_long_unsigned_p
, bool *long_double_p
)
11832 tree argtypes
= TYPE_ARG_TYPES (TREE_TYPE (decl
));
11834 *long_long_unsigned_p
= false;
11835 *long_double_p
= false;
11836 if (processing_template_decl
|| processing_specialization
)
11837 return argtypes
== void_list_node
;
11844 /* Count the number and type of arguments and check for ellipsis. */
11845 for (argtype
= argtypes
, arity
= 0;
11846 argtype
&& argtype
!= void_list_node
;
11847 argtype
= TREE_CHAIN (argtype
))
11849 tree t
= TREE_VALUE (argtype
);
11852 if (TYPE_PTR_P (t
))
11854 bool maybe_raw_p
= false;
11856 if (cp_type_quals (t
) != TYPE_QUAL_CONST
)
11858 t
= TYPE_MAIN_VARIANT (t
);
11859 if ((maybe_raw_p
= same_type_p (t
, char_type_node
))
11860 || same_type_p (t
, wchar_type_node
)
11861 || same_type_p (t
, char8_type_node
)
11862 || same_type_p (t
, char16_type_node
)
11863 || same_type_p (t
, char32_type_node
))
11865 argtype
= TREE_CHAIN (argtype
);
11868 t
= TREE_VALUE (argtype
);
11869 if (maybe_raw_p
&& argtype
== void_list_node
)
11871 else if (same_type_p (t
, size_type_node
))
11880 else if (same_type_p (t
, long_long_unsigned_type_node
))
11883 *long_long_unsigned_p
= true;
11885 else if (same_type_p (t
, long_double_type_node
))
11888 *long_double_p
= true;
11890 else if (same_type_p (t
, char_type_node
))
11892 else if (same_type_p (t
, wchar_type_node
))
11894 else if (same_type_p (t
, char8_type_node
))
11896 else if (same_type_p (t
, char16_type_node
))
11898 else if (same_type_p (t
, char32_type_node
))
11904 return false; /* Found ellipsis. */
11906 if (arity
!= max_arity
)
11913 /* Always returns false since unlike C90, C++ has no concept of implicit
11914 function declarations. */
11917 c_decl_implicit (const_tree
)