1 /* Functions related to invoking methods and overloaded functions.
2 Copyright (C) 1987, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
3 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008
4 Free Software Foundation, Inc.
5 Contributed by Michael Tiemann (tiemann@cygnus.com) and
6 modified by Brendan Kehoe (brendan@cygnus.com).
8 This file is part of GCC.
10 GCC is free software; you can redistribute it and/or modify
11 it under the terms of the GNU General Public License as published by
12 the Free Software Foundation; either version 3, or (at your option)
15 GCC is distributed in the hope that it will be useful,
16 but WITHOUT ANY WARRANTY; without even the implied warranty of
17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 GNU General Public License for more details.
20 You should have received a copy of the GNU General Public License
21 along with GCC; see the file COPYING3. If not see
22 <http://www.gnu.org/licenses/>. */
25 /* High-level class interface. */
29 #include "coretypes.h"
38 #include "diagnostic.h"
42 #include "langhooks.h"
44 /* The various kinds of conversion. */
46 typedef enum conversion_kind
{
62 /* The rank of the conversion. Order of the enumerals matters; better
63 conversions should come earlier in the list. */
65 typedef enum conversion_rank
{
76 /* An implicit conversion sequence, in the sense of [over.best.ics].
77 The first conversion to be performed is at the end of the chain.
78 That conversion is always a cr_identity conversion. */
80 typedef struct conversion conversion
;
82 /* The kind of conversion represented by this step. */
84 /* The rank of this conversion. */
86 BOOL_BITFIELD user_conv_p
: 1;
87 BOOL_BITFIELD ellipsis_p
: 1;
88 BOOL_BITFIELD this_p
: 1;
89 BOOL_BITFIELD bad_p
: 1;
90 /* If KIND is ck_ref_bind ck_base_conv, true to indicate that a
91 temporary should be created to hold the result of the
93 BOOL_BITFIELD need_temporary_p
: 1;
94 /* If KIND is ck_ptr or ck_pmem, true to indicate that a conversion
95 from a pointer-to-derived to pointer-to-base is being performed. */
96 BOOL_BITFIELD base_p
: 1;
97 /* If KIND is ck_ref_bind, true when either an lvalue reference is
98 being bound to an lvalue expression or an rvalue reference is
99 being bound to an rvalue expression. */
100 BOOL_BITFIELD rvaluedness_matches_p
: 1;
101 BOOL_BITFIELD check_narrowing
: 1;
102 /* The type of the expression resulting from the conversion. */
105 /* The next conversion in the chain. Since the conversions are
106 arranged from outermost to innermost, the NEXT conversion will
107 actually be performed before this conversion. This variant is
108 used only when KIND is neither ck_identity nor ck_ambig. */
110 /* The expression at the beginning of the conversion chain. This
111 variant is used only if KIND is ck_identity or ck_ambig. */
113 /* The array of conversions for an initializer_list. */
116 /* The function candidate corresponding to this conversion
117 sequence. This field is only used if KIND is ck_user. */
118 struct z_candidate
*cand
;
121 #define CONVERSION_RANK(NODE) \
122 ((NODE)->bad_p ? cr_bad \
123 : (NODE)->ellipsis_p ? cr_ellipsis \
124 : (NODE)->user_conv_p ? cr_user \
127 static struct obstack conversion_obstack
;
128 static bool conversion_obstack_initialized
;
130 static struct z_candidate
* tourney (struct z_candidate
*);
131 static int equal_functions (tree
, tree
);
132 static int joust (struct z_candidate
*, struct z_candidate
*, bool);
133 static int compare_ics (conversion
*, conversion
*);
134 static tree
build_over_call (struct z_candidate
*, int, tsubst_flags_t
);
135 static tree
build_java_interface_fn_ref (tree
, tree
);
136 #define convert_like(CONV, EXPR, COMPLAIN) \
137 convert_like_real ((CONV), (EXPR), NULL_TREE, 0, 0, \
138 /*issue_conversion_warnings=*/true, \
139 /*c_cast_p=*/false, (COMPLAIN))
140 #define convert_like_with_context(CONV, EXPR, FN, ARGNO, COMPLAIN ) \
141 convert_like_real ((CONV), (EXPR), (FN), (ARGNO), 0, \
142 /*issue_conversion_warnings=*/true, \
143 /*c_cast_p=*/false, (COMPLAIN))
144 static tree
convert_like_real (conversion
*, tree
, tree
, int, int, bool,
145 bool, tsubst_flags_t
);
146 static void op_error (enum tree_code
, enum tree_code
, tree
, tree
,
148 static tree
build_object_call (tree
, tree
, tsubst_flags_t
);
149 static tree
resolve_args (tree
);
150 static struct z_candidate
*build_user_type_conversion_1 (tree
, tree
, int);
151 static void print_z_candidate (const char *, struct z_candidate
*);
152 static void print_z_candidates (struct z_candidate
*);
153 static tree
build_this (tree
);
154 static struct z_candidate
*splice_viable (struct z_candidate
*, bool, bool *);
155 static bool any_strictly_viable (struct z_candidate
*);
156 static struct z_candidate
*add_template_candidate
157 (struct z_candidate
**, tree
, tree
, tree
, tree
, tree
,
158 tree
, tree
, int, unification_kind_t
);
159 static struct z_candidate
*add_template_candidate_real
160 (struct z_candidate
**, tree
, tree
, tree
, tree
, tree
,
161 tree
, tree
, int, tree
, unification_kind_t
);
162 static struct z_candidate
*add_template_conv_candidate
163 (struct z_candidate
**, tree
, tree
, tree
, tree
, tree
, tree
);
164 static void add_builtin_candidates
165 (struct z_candidate
**, enum tree_code
, enum tree_code
,
167 static void add_builtin_candidate
168 (struct z_candidate
**, enum tree_code
, enum tree_code
,
169 tree
, tree
, tree
, tree
*, tree
*, int);
170 static bool is_complete (tree
);
171 static void build_builtin_candidate
172 (struct z_candidate
**, tree
, tree
, tree
, tree
*, tree
*,
174 static struct z_candidate
*add_conv_candidate
175 (struct z_candidate
**, tree
, tree
, tree
, tree
, tree
);
176 static struct z_candidate
*add_function_candidate
177 (struct z_candidate
**, tree
, tree
, tree
, tree
, tree
, int);
178 static conversion
*implicit_conversion (tree
, tree
, tree
, bool, int);
179 static conversion
*standard_conversion (tree
, tree
, tree
, bool, int);
180 static conversion
*reference_binding (tree
, tree
, tree
, bool, int);
181 static conversion
*build_conv (conversion_kind
, tree
, conversion
*);
182 static conversion
*build_list_conv (tree
, tree
, int);
183 static bool is_subseq (conversion
*, conversion
*);
184 static conversion
*maybe_handle_ref_bind (conversion
**);
185 static void maybe_handle_implicit_object (conversion
**);
186 static struct z_candidate
*add_candidate
187 (struct z_candidate
**, tree
, tree
, size_t,
188 conversion
**, tree
, tree
, int);
189 static tree
source_type (conversion
*);
190 static void add_warning (struct z_candidate
*, struct z_candidate
*);
191 static bool reference_related_p (tree
, tree
);
192 static bool reference_compatible_p (tree
, tree
);
193 static conversion
*convert_class_to_reference (tree
, tree
, tree
);
194 static conversion
*direct_reference_binding (tree
, conversion
*);
195 static bool promoted_arithmetic_type_p (tree
);
196 static conversion
*conditional_conversion (tree
, tree
);
197 static char *name_as_c_string (tree
, tree
, bool *);
198 static tree
call_builtin_trap (void);
199 static tree
prep_operand (tree
);
200 static void add_candidates (tree
, tree
, tree
, bool, tree
, tree
,
201 int, struct z_candidate
**);
202 static conversion
*merge_conversion_sequences (conversion
*, conversion
*);
203 static bool magic_varargs_p (tree
);
204 static tree
build_temp (tree
, tree
, int, diagnostic_t
*);
206 /* Returns nonzero iff the destructor name specified in NAME matches BASETYPE.
207 NAME can take many forms... */
210 check_dtor_name (tree basetype
, tree name
)
212 /* Just accept something we've already complained about. */
213 if (name
== error_mark_node
)
216 if (TREE_CODE (name
) == TYPE_DECL
)
217 name
= TREE_TYPE (name
);
218 else if (TYPE_P (name
))
220 else if (TREE_CODE (name
) == IDENTIFIER_NODE
)
222 if ((MAYBE_CLASS_TYPE_P (basetype
)
223 && name
== constructor_name (basetype
))
224 || (TREE_CODE (basetype
) == ENUMERAL_TYPE
225 && name
== TYPE_IDENTIFIER (basetype
)))
228 name
= get_type_value (name
);
234 template <class T> struct S { ~S(); };
238 NAME will be a class template. */
239 gcc_assert (DECL_CLASS_TEMPLATE_P (name
));
245 return same_type_p (TYPE_MAIN_VARIANT (basetype
), TYPE_MAIN_VARIANT (name
));
248 /* We want the address of a function or method. We avoid creating a
249 pointer-to-member function. */
252 build_addr_func (tree function
)
254 tree type
= TREE_TYPE (function
);
256 /* We have to do these by hand to avoid real pointer to member
258 if (TREE_CODE (type
) == METHOD_TYPE
)
260 if (TREE_CODE (function
) == OFFSET_REF
)
262 tree object
= build_address (TREE_OPERAND (function
, 0));
263 return get_member_function_from_ptrfunc (&object
,
264 TREE_OPERAND (function
, 1));
266 function
= build_address (function
);
269 function
= decay_conversion (function
);
274 /* Build a CALL_EXPR, we can handle FUNCTION_TYPEs, METHOD_TYPEs, or
275 POINTER_TYPE to those. Note, pointer to member function types
276 (TYPE_PTRMEMFUNC_P) must be handled by our callers. There are
277 two variants. build_call_a is the primitive taking an array of
278 arguments, while build_call_n is a wrapper that handles varargs. */
281 build_call_n (tree function
, int n
, ...)
284 return build_call_a (function
, 0, NULL
);
287 tree
*argarray
= (tree
*) alloca (n
* sizeof (tree
));
292 for (i
= 0; i
< n
; i
++)
293 argarray
[i
] = va_arg (ap
, tree
);
295 return build_call_a (function
, n
, argarray
);
300 build_call_a (tree function
, int n
, tree
*argarray
)
302 int is_constructor
= 0;
309 function
= build_addr_func (function
);
311 gcc_assert (TYPE_PTR_P (TREE_TYPE (function
)));
312 fntype
= TREE_TYPE (TREE_TYPE (function
));
313 gcc_assert (TREE_CODE (fntype
) == FUNCTION_TYPE
314 || TREE_CODE (fntype
) == METHOD_TYPE
);
315 result_type
= TREE_TYPE (fntype
);
317 if (TREE_CODE (function
) == ADDR_EXPR
318 && TREE_CODE (TREE_OPERAND (function
, 0)) == FUNCTION_DECL
)
320 decl
= TREE_OPERAND (function
, 0);
321 if (!TREE_USED (decl
))
323 /* We invoke build_call directly for several library
324 functions. These may have been declared normally if
325 we're building libgcc, so we can't just check
327 gcc_assert (DECL_ARTIFICIAL (decl
)
328 || !strncmp (IDENTIFIER_POINTER (DECL_NAME (decl
)),
336 /* We check both the decl and the type; a function may be known not to
337 throw without being declared throw(). */
338 nothrow
= ((decl
&& TREE_NOTHROW (decl
))
339 || TYPE_NOTHROW_P (TREE_TYPE (TREE_TYPE (function
))));
341 if (decl
&& TREE_THIS_VOLATILE (decl
) && cfun
&& cp_function_chain
)
342 current_function_returns_abnormally
= 1;
344 if (decl
&& TREE_DEPRECATED (decl
))
345 warn_deprecated_use (decl
);
346 require_complete_eh_spec_types (fntype
, decl
);
348 if (decl
&& DECL_CONSTRUCTOR_P (decl
))
351 /* Don't pass empty class objects by value. This is useful
352 for tags in STL, which are used to control overload resolution.
353 We don't need to handle other cases of copying empty classes. */
354 if (! decl
|| ! DECL_BUILT_IN (decl
))
355 for (i
= 0; i
< n
; i
++)
356 if (is_empty_class (TREE_TYPE (argarray
[i
]))
357 && ! TREE_ADDRESSABLE (TREE_TYPE (argarray
[i
])))
359 tree t
= build0 (EMPTY_CLASS_EXPR
, TREE_TYPE (argarray
[i
]));
360 argarray
[i
] = build2 (COMPOUND_EXPR
, TREE_TYPE (t
),
364 function
= build_call_array (result_type
, function
, n
, argarray
);
365 TREE_HAS_CONSTRUCTOR (function
) = is_constructor
;
366 TREE_NOTHROW (function
) = nothrow
;
371 /* Build something of the form ptr->method (args)
372 or object.method (args). This can also build
373 calls to constructors, and find friends.
375 Member functions always take their class variable
378 INSTANCE is a class instance.
380 NAME is the name of the method desired, usually an IDENTIFIER_NODE.
382 PARMS help to figure out what that NAME really refers to.
384 BASETYPE_PATH, if non-NULL, contains a chain from the type of INSTANCE
385 down to the real instance type to use for access checking. We need this
386 information to get protected accesses correct.
388 FLAGS is the logical disjunction of zero or more LOOKUP_
389 flags. See cp-tree.h for more info.
391 If this is all OK, calls build_function_call with the resolved
394 This function must also handle being called to perform
395 initialization, promotion/coercion of arguments, and
396 instantiation of default parameters.
398 Note that NAME may refer to an instance variable name. If
399 `operator()()' is defined for the type of that field, then we return
402 /* New overloading code. */
404 typedef struct z_candidate z_candidate
;
406 typedef struct candidate_warning candidate_warning
;
407 struct candidate_warning
{
409 candidate_warning
*next
;
413 /* The FUNCTION_DECL that will be called if this candidate is
414 selected by overload resolution. */
416 /* The arguments to use when calling this function. */
418 /* The implicit conversion sequences for each of the arguments to
421 /* The number of implicit conversion sequences. */
423 /* If FN is a user-defined conversion, the standard conversion
424 sequence from the type returned by FN to the desired destination
426 conversion
*second_conv
;
428 /* If FN is a member function, the binfo indicating the path used to
429 qualify the name of FN at the call site. This path is used to
430 determine whether or not FN is accessible if it is selected by
431 overload resolution. The DECL_CONTEXT of FN will always be a
432 (possibly improper) base of this binfo. */
434 /* If FN is a non-static member function, the binfo indicating the
435 subobject to which the `this' pointer should be converted if FN
436 is selected by overload resolution. The type pointed to the by
437 the `this' pointer must correspond to the most derived class
438 indicated by the CONVERSION_PATH. */
439 tree conversion_path
;
441 candidate_warning
*warnings
;
445 /* Returns true iff T is a null pointer constant in the sense of
449 null_ptr_cst_p (tree t
)
453 A null pointer constant is an integral constant expression
454 (_expr.const_) rvalue of integer type that evaluates to zero. */
455 t
= integral_constant_value (t
);
458 if (CP_INTEGRAL_TYPE_P (TREE_TYPE (t
)) && integer_zerop (t
))
461 if (!TREE_OVERFLOW (t
))
467 /* Returns nonzero if PARMLIST consists of only default parms and/or
471 sufficient_parms_p (const_tree parmlist
)
473 for (; parmlist
&& parmlist
!= void_list_node
;
474 parmlist
= TREE_CHAIN (parmlist
))
475 if (!TREE_PURPOSE (parmlist
))
480 /* Allocate N bytes of memory from the conversion obstack. The memory
481 is zeroed before being returned. */
484 conversion_obstack_alloc (size_t n
)
487 if (!conversion_obstack_initialized
)
489 gcc_obstack_init (&conversion_obstack
);
490 conversion_obstack_initialized
= true;
492 p
= obstack_alloc (&conversion_obstack
, n
);
497 /* Dynamically allocate a conversion. */
500 alloc_conversion (conversion_kind kind
)
503 c
= (conversion
*) conversion_obstack_alloc (sizeof (conversion
));
508 #ifdef ENABLE_CHECKING
510 /* Make sure that all memory on the conversion obstack has been
514 validate_conversion_obstack (void)
516 if (conversion_obstack_initialized
)
517 gcc_assert ((obstack_next_free (&conversion_obstack
)
518 == obstack_base (&conversion_obstack
)));
521 #endif /* ENABLE_CHECKING */
523 /* Dynamically allocate an array of N conversions. */
526 alloc_conversions (size_t n
)
528 return (conversion
**) conversion_obstack_alloc (n
* sizeof (conversion
*));
532 build_conv (conversion_kind code
, tree type
, conversion
*from
)
535 conversion_rank rank
= CONVERSION_RANK (from
);
537 /* Note that the caller is responsible for filling in t->cand for
538 user-defined conversions. */
539 t
= alloc_conversion (code
);
562 t
->user_conv_p
= (code
== ck_user
|| from
->user_conv_p
);
563 t
->bad_p
= from
->bad_p
;
568 /* Represent a conversion from CTOR, a braced-init-list, to TYPE, a
569 specialization of std::initializer_list<T>, if such a conversion is
573 build_list_conv (tree type
, tree ctor
, int flags
)
575 tree elttype
= TREE_VEC_ELT (CLASSTYPE_TI_ARGS (type
), 0);
576 unsigned len
= CONSTRUCTOR_NELTS (ctor
);
577 conversion
**subconvs
= alloc_conversions (len
);
582 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (ctor
), i
, val
)
585 = implicit_conversion (elttype
, TREE_TYPE (val
), val
,
593 t
= alloc_conversion (ck_list
);
595 t
->u
.list
= subconvs
;
598 for (i
= 0; i
< len
; ++i
)
600 conversion
*sub
= subconvs
[i
];
601 if (sub
->rank
> t
->rank
)
603 if (sub
->user_conv_p
)
604 t
->user_conv_p
= true;
612 /* Represent a conversion from CTOR, a braced-init-list, to TYPE, an
613 aggregate class, if such a conversion is possible. */
616 build_aggr_conv (tree type
, tree ctor
, int flags
)
618 unsigned HOST_WIDE_INT i
= 0;
620 tree field
= TYPE_FIELDS (type
);
622 for (; field
; field
= TREE_CHAIN (field
), ++i
)
624 if (TREE_CODE (field
) != FIELD_DECL
)
626 if (i
< CONSTRUCTOR_NELTS (ctor
))
628 constructor_elt
*ce
= CONSTRUCTOR_ELT (ctor
, i
);
629 if (!can_convert_arg (TREE_TYPE (field
), TREE_TYPE (ce
->value
),
633 else if (build_value_init (TREE_TYPE (field
)) == error_mark_node
)
637 c
= alloc_conversion (ck_aggr
);
640 c
->user_conv_p
= true;
645 /* Build a representation of the identity conversion from EXPR to
646 itself. The TYPE should match the type of EXPR, if EXPR is non-NULL. */
649 build_identity_conv (tree type
, tree expr
)
653 c
= alloc_conversion (ck_identity
);
660 /* Converting from EXPR to TYPE was ambiguous in the sense that there
661 were multiple user-defined conversions to accomplish the job.
662 Build a conversion that indicates that ambiguity. */
665 build_ambiguous_conv (tree type
, tree expr
)
669 c
= alloc_conversion (ck_ambig
);
677 strip_top_quals (tree t
)
679 if (TREE_CODE (t
) == ARRAY_TYPE
)
681 return cp_build_qualified_type (t
, 0);
684 /* Returns the standard conversion path (see [conv]) from type FROM to type
685 TO, if any. For proper handling of null pointer constants, you must
686 also pass the expression EXPR to convert from. If C_CAST_P is true,
687 this conversion is coming from a C-style cast. */
690 standard_conversion (tree to
, tree from
, tree expr
, bool c_cast_p
,
693 enum tree_code fcode
, tcode
;
695 bool fromref
= false;
697 to
= non_reference (to
);
698 if (TREE_CODE (from
) == REFERENCE_TYPE
)
701 from
= TREE_TYPE (from
);
703 to
= strip_top_quals (to
);
704 from
= strip_top_quals (from
);
706 if ((TYPE_PTRFN_P (to
) || TYPE_PTRMEMFUNC_P (to
))
707 && expr
&& type_unknown_p (expr
))
709 tsubst_flags_t tflags
= tf_conv
;
710 if (!(flags
& LOOKUP_PROTECT
))
711 tflags
|= tf_no_access_control
;
712 expr
= instantiate_type (to
, expr
, tflags
);
713 if (expr
== error_mark_node
)
715 from
= TREE_TYPE (expr
);
718 fcode
= TREE_CODE (from
);
719 tcode
= TREE_CODE (to
);
721 conv
= build_identity_conv (from
, expr
);
722 if (fcode
== FUNCTION_TYPE
|| fcode
== ARRAY_TYPE
)
724 from
= type_decays_to (from
);
725 fcode
= TREE_CODE (from
);
726 conv
= build_conv (ck_lvalue
, from
, conv
);
728 else if (fromref
|| (expr
&& lvalue_p (expr
)))
733 bitfield_type
= is_bitfield_expr_with_lowered_type (expr
);
736 from
= strip_top_quals (bitfield_type
);
737 fcode
= TREE_CODE (from
);
740 conv
= build_conv (ck_rvalue
, from
, conv
);
743 /* Allow conversion between `__complex__' data types. */
744 if (tcode
== COMPLEX_TYPE
&& fcode
== COMPLEX_TYPE
)
746 /* The standard conversion sequence to convert FROM to TO is
747 the standard conversion sequence to perform componentwise
749 conversion
*part_conv
= standard_conversion
750 (TREE_TYPE (to
), TREE_TYPE (from
), NULL_TREE
, c_cast_p
, flags
);
754 conv
= build_conv (part_conv
->kind
, to
, conv
);
755 conv
->rank
= part_conv
->rank
;
763 if (same_type_p (from
, to
))
766 if ((tcode
== POINTER_TYPE
|| TYPE_PTR_TO_MEMBER_P (to
))
767 && expr
&& null_ptr_cst_p (expr
))
768 conv
= build_conv (ck_std
, to
, conv
);
769 else if ((tcode
== INTEGER_TYPE
&& fcode
== POINTER_TYPE
)
770 || (tcode
== POINTER_TYPE
&& fcode
== INTEGER_TYPE
))
772 /* For backwards brain damage compatibility, allow interconversion of
773 pointers and integers with a pedwarn. */
774 conv
= build_conv (ck_std
, to
, conv
);
777 else if (UNSCOPED_ENUM_P (to
) && fcode
== INTEGER_TYPE
)
779 /* For backwards brain damage compatibility, allow interconversion of
780 enums and integers with a pedwarn. */
781 conv
= build_conv (ck_std
, to
, conv
);
784 else if ((tcode
== POINTER_TYPE
&& fcode
== POINTER_TYPE
)
785 || (TYPE_PTRMEM_P (to
) && TYPE_PTRMEM_P (from
)))
790 if (tcode
== POINTER_TYPE
791 && same_type_ignoring_top_level_qualifiers_p (TREE_TYPE (from
),
794 else if (VOID_TYPE_P (TREE_TYPE (to
))
795 && !TYPE_PTRMEM_P (from
)
796 && TREE_CODE (TREE_TYPE (from
)) != FUNCTION_TYPE
)
798 from
= build_pointer_type
799 (cp_build_qualified_type (void_type_node
,
800 cp_type_quals (TREE_TYPE (from
))));
801 conv
= build_conv (ck_ptr
, from
, conv
);
803 else if (TYPE_PTRMEM_P (from
))
805 tree fbase
= TYPE_PTRMEM_CLASS_TYPE (from
);
806 tree tbase
= TYPE_PTRMEM_CLASS_TYPE (to
);
808 if (DERIVED_FROM_P (fbase
, tbase
)
809 && (same_type_ignoring_top_level_qualifiers_p
810 (TYPE_PTRMEM_POINTED_TO_TYPE (from
),
811 TYPE_PTRMEM_POINTED_TO_TYPE (to
))))
813 from
= build_ptrmem_type (tbase
,
814 TYPE_PTRMEM_POINTED_TO_TYPE (from
));
815 conv
= build_conv (ck_pmem
, from
, conv
);
817 else if (!same_type_p (fbase
, tbase
))
820 else if (CLASS_TYPE_P (TREE_TYPE (from
))
821 && CLASS_TYPE_P (TREE_TYPE (to
))
824 An rvalue of type "pointer to cv D," where D is a
825 class type, can be converted to an rvalue of type
826 "pointer to cv B," where B is a base class (clause
827 _class.derived_) of D. If B is an inaccessible
828 (clause _class.access_) or ambiguous
829 (_class.member.lookup_) base class of D, a program
830 that necessitates this conversion is ill-formed.
831 Therefore, we use DERIVED_FROM_P, and do not check
832 access or uniqueness. */
833 && DERIVED_FROM_P (TREE_TYPE (to
), TREE_TYPE (from
)))
836 cp_build_qualified_type (TREE_TYPE (to
),
837 cp_type_quals (TREE_TYPE (from
)));
838 from
= build_pointer_type (from
);
839 conv
= build_conv (ck_ptr
, from
, conv
);
843 if (tcode
== POINTER_TYPE
)
845 to_pointee
= TREE_TYPE (to
);
846 from_pointee
= TREE_TYPE (from
);
850 to_pointee
= TYPE_PTRMEM_POINTED_TO_TYPE (to
);
851 from_pointee
= TYPE_PTRMEM_POINTED_TO_TYPE (from
);
854 if (same_type_p (from
, to
))
856 else if (c_cast_p
&& comp_ptr_ttypes_const (to
, from
))
857 /* In a C-style cast, we ignore CV-qualification because we
858 are allowed to perform a static_cast followed by a
860 conv
= build_conv (ck_qual
, to
, conv
);
861 else if (!c_cast_p
&& comp_ptr_ttypes (to_pointee
, from_pointee
))
862 conv
= build_conv (ck_qual
, to
, conv
);
863 else if (expr
&& string_conv_p (to
, expr
, 0))
864 /* converting from string constant to char *. */
865 conv
= build_conv (ck_qual
, to
, conv
);
866 else if (ptr_reasonably_similar (to_pointee
, from_pointee
))
868 conv
= build_conv (ck_ptr
, to
, conv
);
876 else if (TYPE_PTRMEMFUNC_P (to
) && TYPE_PTRMEMFUNC_P (from
))
878 tree fromfn
= TREE_TYPE (TYPE_PTRMEMFUNC_FN_TYPE (from
));
879 tree tofn
= TREE_TYPE (TYPE_PTRMEMFUNC_FN_TYPE (to
));
880 tree fbase
= TREE_TYPE (TREE_VALUE (TYPE_ARG_TYPES (fromfn
)));
881 tree tbase
= TREE_TYPE (TREE_VALUE (TYPE_ARG_TYPES (tofn
)));
883 if (!DERIVED_FROM_P (fbase
, tbase
)
884 || !same_type_p (TREE_TYPE (fromfn
), TREE_TYPE (tofn
))
885 || !compparms (TREE_CHAIN (TYPE_ARG_TYPES (fromfn
)),
886 TREE_CHAIN (TYPE_ARG_TYPES (tofn
)))
887 || cp_type_quals (fbase
) != cp_type_quals (tbase
))
890 from
= cp_build_qualified_type (tbase
, cp_type_quals (fbase
));
891 from
= build_method_type_directly (from
,
893 TREE_CHAIN (TYPE_ARG_TYPES (fromfn
)));
894 from
= build_ptrmemfunc_type (build_pointer_type (from
));
895 conv
= build_conv (ck_pmem
, from
, conv
);
898 else if (tcode
== BOOLEAN_TYPE
)
902 An rvalue of arithmetic, unscoped enumeration, pointer, or
903 pointer to member type can be converted to an rvalue of type
905 if (ARITHMETIC_TYPE_P (from
)
906 || UNSCOPED_ENUM_P (from
)
907 || fcode
== POINTER_TYPE
908 || TYPE_PTR_TO_MEMBER_P (from
))
910 conv
= build_conv (ck_std
, to
, conv
);
911 if (fcode
== POINTER_TYPE
912 || TYPE_PTRMEM_P (from
)
913 || (TYPE_PTRMEMFUNC_P (from
)
914 && conv
->rank
< cr_pbool
))
915 conv
->rank
= cr_pbool
;
921 /* We don't check for ENUMERAL_TYPE here because there are no standard
922 conversions to enum type. */
923 /* As an extension, allow conversion to complex type. */
924 else if (ARITHMETIC_TYPE_P (to
))
926 if (! (INTEGRAL_CODE_P (fcode
) || fcode
== REAL_TYPE
)
927 || SCOPED_ENUM_P (from
))
929 conv
= build_conv (ck_std
, to
, conv
);
931 /* Give this a better rank if it's a promotion. */
932 if (same_type_p (to
, type_promotes_to (from
))
933 && conv
->u
.next
->rank
<= cr_promotion
)
934 conv
->rank
= cr_promotion
;
936 else if (fcode
== VECTOR_TYPE
&& tcode
== VECTOR_TYPE
937 && vector_types_convertible_p (from
, to
, false))
938 return build_conv (ck_std
, to
, conv
);
939 else if (MAYBE_CLASS_TYPE_P (to
) && MAYBE_CLASS_TYPE_P (from
)
940 && is_properly_derived_from (from
, to
))
942 if (conv
->kind
== ck_rvalue
)
944 conv
= build_conv (ck_base
, to
, conv
);
945 /* The derived-to-base conversion indicates the initialization
946 of a parameter with base type from an object of a derived
947 type. A temporary object is created to hold the result of
948 the conversion unless we're binding directly to a reference. */
949 conv
->need_temporary_p
= !(flags
& LOOKUP_NO_TEMP_BIND
);
954 if (flags
& LOOKUP_NO_NARROWING
)
955 conv
->check_narrowing
= true;
960 /* Returns nonzero if T1 is reference-related to T2. */
963 reference_related_p (tree t1
, tree t2
)
965 t1
= TYPE_MAIN_VARIANT (t1
);
966 t2
= TYPE_MAIN_VARIANT (t2
);
970 Given types "cv1 T1" and "cv2 T2," "cv1 T1" is reference-related
971 to "cv2 T2" if T1 is the same type as T2, or T1 is a base class
973 return (same_type_p (t1
, t2
)
974 || (CLASS_TYPE_P (t1
) && CLASS_TYPE_P (t2
)
975 && DERIVED_FROM_P (t1
, t2
)));
978 /* Returns nonzero if T1 is reference-compatible with T2. */
981 reference_compatible_p (tree t1
, tree t2
)
985 "cv1 T1" is reference compatible with "cv2 T2" if T1 is
986 reference-related to T2 and cv1 is the same cv-qualification as,
987 or greater cv-qualification than, cv2. */
988 return (reference_related_p (t1
, t2
)
989 && at_least_as_qualified_p (t1
, t2
));
992 /* Determine whether or not the EXPR (of class type S) can be
993 converted to T as in [over.match.ref]. */
996 convert_class_to_reference (tree reference_type
, tree s
, tree expr
)
1002 struct z_candidate
*candidates
;
1003 struct z_candidate
*cand
;
1006 conversions
= lookup_conversions (s
);
1012 Assuming that "cv1 T" is the underlying type of the reference
1013 being initialized, and "cv S" is the type of the initializer
1014 expression, with S a class type, the candidate functions are
1015 selected as follows:
1017 --The conversion functions of S and its base classes are
1018 considered. Those that are not hidden within S and yield type
1019 "reference to cv2 T2", where "cv1 T" is reference-compatible
1020 (_dcl.init.ref_) with "cv2 T2", are candidate functions.
1022 The argument list has one argument, which is the initializer
1027 /* Conceptually, we should take the address of EXPR and put it in
1028 the argument list. Unfortunately, however, that can result in
1029 error messages, which we should not issue now because we are just
1030 trying to find a conversion operator. Therefore, we use NULL,
1031 cast to the appropriate type. */
1032 arglist
= build_int_cst (build_pointer_type (s
), 0);
1033 arglist
= build_tree_list (NULL_TREE
, arglist
);
1035 t
= TREE_TYPE (reference_type
);
1039 tree fns
= TREE_VALUE (conversions
);
1041 for (; fns
; fns
= OVL_NEXT (fns
))
1043 tree f
= OVL_CURRENT (fns
);
1044 tree t2
= TREE_TYPE (TREE_TYPE (f
));
1048 /* If this is a template function, try to get an exact
1050 if (TREE_CODE (f
) == TEMPLATE_DECL
)
1052 cand
= add_template_candidate (&candidates
,
1058 TREE_PURPOSE (conversions
),
1064 /* Now, see if the conversion function really returns
1065 an lvalue of the appropriate type. From the
1066 point of view of unification, simply returning an
1067 rvalue of the right type is good enough. */
1069 t2
= TREE_TYPE (TREE_TYPE (f
));
1070 if (TREE_CODE (t2
) != REFERENCE_TYPE
1071 || !reference_compatible_p (t
, TREE_TYPE (t2
)))
1073 candidates
= candidates
->next
;
1078 else if (TREE_CODE (t2
) == REFERENCE_TYPE
1079 && reference_compatible_p (t
, TREE_TYPE (t2
)))
1080 cand
= add_function_candidate (&candidates
, f
, s
, arglist
,
1082 TREE_PURPOSE (conversions
),
1087 conversion
*identity_conv
;
1088 /* Build a standard conversion sequence indicating the
1089 binding from the reference type returned by the
1090 function to the desired REFERENCE_TYPE. */
1092 = build_identity_conv (TREE_TYPE (TREE_TYPE
1093 (TREE_TYPE (cand
->fn
))),
1096 = (direct_reference_binding
1097 (reference_type
, identity_conv
));
1098 cand
->second_conv
->rvaluedness_matches_p
1099 = TYPE_REF_IS_RVALUE (TREE_TYPE (TREE_TYPE (cand
->fn
)))
1100 == TYPE_REF_IS_RVALUE (reference_type
);
1101 cand
->second_conv
->bad_p
|= cand
->convs
[0]->bad_p
;
1104 conversions
= TREE_CHAIN (conversions
);
1107 candidates
= splice_viable (candidates
, pedantic
, &any_viable_p
);
1108 /* If none of the conversion functions worked out, let our caller
1113 cand
= tourney (candidates
);
1117 /* Now that we know that this is the function we're going to use fix
1118 the dummy first argument. */
1119 cand
->args
= tree_cons (NULL_TREE
,
1121 TREE_CHAIN (cand
->args
));
1123 /* Build a user-defined conversion sequence representing the
1125 conv
= build_conv (ck_user
,
1126 TREE_TYPE (TREE_TYPE (cand
->fn
)),
1127 build_identity_conv (TREE_TYPE (expr
), expr
));
1130 /* Merge it with the standard conversion sequence from the
1131 conversion function's return type to the desired type. */
1132 cand
->second_conv
= merge_conversion_sequences (conv
, cand
->second_conv
);
1134 if (cand
->viable
== -1)
1137 return cand
->second_conv
;
1140 /* A reference of the indicated TYPE is being bound directly to the
1141 expression represented by the implicit conversion sequence CONV.
1142 Return a conversion sequence for this binding. */
1145 direct_reference_binding (tree type
, conversion
*conv
)
1149 gcc_assert (TREE_CODE (type
) == REFERENCE_TYPE
);
1150 gcc_assert (TREE_CODE (conv
->type
) != REFERENCE_TYPE
);
1152 t
= TREE_TYPE (type
);
1156 When a parameter of reference type binds directly
1157 (_dcl.init.ref_) to an argument expression, the implicit
1158 conversion sequence is the identity conversion, unless the
1159 argument expression has a type that is a derived class of the
1160 parameter type, in which case the implicit conversion sequence is
1161 a derived-to-base Conversion.
1163 If the parameter binds directly to the result of applying a
1164 conversion function to the argument expression, the implicit
1165 conversion sequence is a user-defined conversion sequence
1166 (_over.ics.user_), with the second standard conversion sequence
1167 either an identity conversion or, if the conversion function
1168 returns an entity of a type that is a derived class of the
1169 parameter type, a derived-to-base conversion. */
1170 if (!same_type_ignoring_top_level_qualifiers_p (t
, conv
->type
))
1172 /* Represent the derived-to-base conversion. */
1173 conv
= build_conv (ck_base
, t
, conv
);
1174 /* We will actually be binding to the base-class subobject in
1175 the derived class, so we mark this conversion appropriately.
1176 That way, convert_like knows not to generate a temporary. */
1177 conv
->need_temporary_p
= false;
1179 return build_conv (ck_ref_bind
, type
, conv
);
1182 /* Returns the conversion path from type FROM to reference type TO for
1183 purposes of reference binding. For lvalue binding, either pass a
1184 reference type to FROM or an lvalue expression to EXPR. If the
1185 reference will be bound to a temporary, NEED_TEMPORARY_P is set for
1186 the conversion returned. If C_CAST_P is true, this
1187 conversion is coming from a C-style cast. */
1190 reference_binding (tree rto
, tree rfrom
, tree expr
, bool c_cast_p
, int flags
)
1192 conversion
*conv
= NULL
;
1193 tree to
= TREE_TYPE (rto
);
1198 cp_lvalue_kind lvalue_p
= clk_none
;
1200 if (TREE_CODE (to
) == FUNCTION_TYPE
&& expr
&& type_unknown_p (expr
))
1202 expr
= instantiate_type (to
, expr
, tf_none
);
1203 if (expr
== error_mark_node
)
1205 from
= TREE_TYPE (expr
);
1208 if (TREE_CODE (from
) == REFERENCE_TYPE
)
1210 /* Anything with reference type is an lvalue. */
1211 lvalue_p
= clk_ordinary
;
1212 from
= TREE_TYPE (from
);
1215 lvalue_p
= real_lvalue_p (expr
);
1218 if ((lvalue_p
& clk_bitfield
) != 0)
1219 tfrom
= unlowered_expr_type (expr
);
1221 /* Figure out whether or not the types are reference-related and
1222 reference compatible. We have do do this after stripping
1223 references from FROM. */
1224 related_p
= reference_related_p (to
, tfrom
);
1225 /* If this is a C cast, first convert to an appropriately qualified
1226 type, so that we can later do a const_cast to the desired type. */
1227 if (related_p
&& c_cast_p
1228 && !at_least_as_qualified_p (to
, tfrom
))
1229 to
= build_qualified_type (to
, cp_type_quals (tfrom
));
1230 compatible_p
= reference_compatible_p (to
, tfrom
);
1232 /* Directly bind reference when target expression's type is compatible with
1233 the reference and expression is an lvalue. In DR391, the wording in
1234 [8.5.3/5 dcl.init.ref] is changed to also require direct bindings for
1235 const and rvalue references to rvalues of compatible class type. */
1238 || (!(flags
& LOOKUP_NO_TEMP_BIND
)
1239 && (CP_TYPE_CONST_NON_VOLATILE_P(to
) || TYPE_REF_IS_RVALUE (rto
))
1240 && CLASS_TYPE_P (from
))))
1244 If the initializer expression
1246 -- is an lvalue (but not an lvalue for a bit-field), and "cv1 T1"
1247 is reference-compatible with "cv2 T2,"
1249 the reference is bound directly to the initializer expression
1253 If the initializer expression is an rvalue, with T2 a class type,
1254 and "cv1 T1" is reference-compatible with "cv2 T2", the reference
1255 is bound to the object represented by the rvalue or to a sub-object
1256 within that object. */
1258 conv
= build_identity_conv (tfrom
, expr
);
1259 conv
= direct_reference_binding (rto
, conv
);
1261 if (flags
& LOOKUP_PREFER_RVALUE
)
1262 /* The top-level caller requested that we pretend that the lvalue
1263 be treated as an rvalue. */
1264 conv
->rvaluedness_matches_p
= TYPE_REF_IS_RVALUE (rto
);
1266 conv
->rvaluedness_matches_p
1267 = (TYPE_REF_IS_RVALUE (rto
) == !lvalue_p
);
1269 if ((lvalue_p
& clk_bitfield
) != 0
1270 || ((lvalue_p
& clk_packed
) != 0 && !TYPE_PACKED (to
)))
1271 /* For the purposes of overload resolution, we ignore the fact
1272 this expression is a bitfield or packed field. (In particular,
1273 [over.ics.ref] says specifically that a function with a
1274 non-const reference parameter is viable even if the
1275 argument is a bitfield.)
1277 However, when we actually call the function we must create
1278 a temporary to which to bind the reference. If the
1279 reference is volatile, or isn't const, then we cannot make
1280 a temporary, so we just issue an error when the conversion
1282 conv
->need_temporary_p
= true;
1286 /* [class.conv.fct] A conversion function is never used to convert a
1287 (possibly cv-qualified) object to the (possibly cv-qualified) same
1288 object type (or a reference to it), to a (possibly cv-qualified) base
1289 class of that type (or a reference to it).... */
1290 else if (CLASS_TYPE_P (from
) && !related_p
1291 && !(flags
& LOOKUP_NO_CONVERSION
))
1295 If the initializer expression
1297 -- has a class type (i.e., T2 is a class type) can be
1298 implicitly converted to an lvalue of type "cv3 T3," where
1299 "cv1 T1" is reference-compatible with "cv3 T3". (this
1300 conversion is selected by enumerating the applicable
1301 conversion functions (_over.match.ref_) and choosing the
1302 best one through overload resolution. (_over.match_).
1304 the reference is bound to the lvalue result of the conversion
1305 in the second case. */
1306 conv
= convert_class_to_reference (rto
, from
, expr
);
1311 /* From this point on, we conceptually need temporaries, even if we
1312 elide them. Only the cases above are "direct bindings". */
1313 if (flags
& LOOKUP_NO_TEMP_BIND
)
1318 When a parameter of reference type is not bound directly to an
1319 argument expression, the conversion sequence is the one required
1320 to convert the argument expression to the underlying type of the
1321 reference according to _over.best.ics_. Conceptually, this
1322 conversion sequence corresponds to copy-initializing a temporary
1323 of the underlying type with the argument expression. Any
1324 difference in top-level cv-qualification is subsumed by the
1325 initialization itself and does not constitute a conversion. */
1329 Otherwise, the reference shall be to a non-volatile const type.
1331 Under C++0x, [8.5.3/5 dcl.init.ref] it may also be an rvalue reference */
1332 if (!CP_TYPE_CONST_NON_VOLATILE_P (to
) && !TYPE_REF_IS_RVALUE (rto
))
1337 Otherwise, a temporary of type "cv1 T1" is created and
1338 initialized from the initializer expression using the rules for a
1339 non-reference copy initialization. If T1 is reference-related to
1340 T2, cv1 must be the same cv-qualification as, or greater
1341 cv-qualification than, cv2; otherwise, the program is ill-formed. */
1342 if (related_p
&& !at_least_as_qualified_p (to
, from
))
1345 /* We're generating a temporary now, but don't bind any more in the
1346 conversion (specifically, don't slice the temporary returned by a
1347 conversion operator). */
1348 flags
|= LOOKUP_NO_TEMP_BIND
;
1350 conv
= implicit_conversion (to
, from
, expr
, c_cast_p
,
1355 conv
= build_conv (ck_ref_bind
, rto
, conv
);
1356 /* This reference binding, unlike those above, requires the
1357 creation of a temporary. */
1358 conv
->need_temporary_p
= true;
1359 conv
->rvaluedness_matches_p
= TYPE_REF_IS_RVALUE (rto
);
1364 /* Returns the implicit conversion sequence (see [over.ics]) from type
1365 FROM to type TO. The optional expression EXPR may affect the
1366 conversion. FLAGS are the usual overloading flags. If C_CAST_P is
1367 true, this conversion is coming from a C-style cast. */
1370 implicit_conversion (tree to
, tree from
, tree expr
, bool c_cast_p
,
1375 if (from
== error_mark_node
|| to
== error_mark_node
1376 || expr
== error_mark_node
)
1379 if (TREE_CODE (to
) == REFERENCE_TYPE
)
1380 conv
= reference_binding (to
, from
, expr
, c_cast_p
, flags
);
1382 conv
= standard_conversion (to
, from
, expr
, c_cast_p
, flags
);
1387 if (is_std_init_list (to
) && expr
1388 && BRACE_ENCLOSED_INITIALIZER_P (expr
))
1389 return build_list_conv (to
, expr
, flags
);
1391 if (expr
!= NULL_TREE
1392 && (MAYBE_CLASS_TYPE_P (from
)
1393 || MAYBE_CLASS_TYPE_P (to
))
1394 && (flags
& LOOKUP_NO_CONVERSION
) == 0)
1396 struct z_candidate
*cand
;
1397 int convflags
= ((flags
& LOOKUP_NO_TEMP_BIND
)
1398 |LOOKUP_ONLYCONVERTING
);
1400 if (CLASS_TYPE_P (to
)
1401 && !CLASSTYPE_NON_AGGREGATE (complete_type (to
))
1402 && BRACE_ENCLOSED_INITIALIZER_P (expr
))
1403 return build_aggr_conv (to
, expr
, flags
);
1405 cand
= build_user_type_conversion_1 (to
, expr
, convflags
);
1407 conv
= cand
->second_conv
;
1409 /* We used to try to bind a reference to a temporary here, but that
1410 is now handled after the recursive call to this function at the end
1411 of reference_binding. */
1418 /* Add a new entry to the list of candidates. Used by the add_*_candidate
1421 static struct z_candidate
*
1422 add_candidate (struct z_candidate
**candidates
,
1424 size_t num_convs
, conversion
**convs
,
1425 tree access_path
, tree conversion_path
,
1428 struct z_candidate
*cand
= (struct z_candidate
*)
1429 conversion_obstack_alloc (sizeof (struct z_candidate
));
1433 cand
->convs
= convs
;
1434 cand
->num_convs
= num_convs
;
1435 cand
->access_path
= access_path
;
1436 cand
->conversion_path
= conversion_path
;
1437 cand
->viable
= viable
;
1438 cand
->next
= *candidates
;
1444 /* Create an overload candidate for the function or method FN called with
1445 the argument list ARGLIST and add it to CANDIDATES. FLAGS is passed on
1446 to implicit_conversion.
1448 CTYPE, if non-NULL, is the type we want to pretend this function
1449 comes from for purposes of overload resolution. */
1451 static struct z_candidate
*
1452 add_function_candidate (struct z_candidate
**candidates
,
1453 tree fn
, tree ctype
, tree arglist
,
1454 tree access_path
, tree conversion_path
,
1457 tree parmlist
= TYPE_ARG_TYPES (TREE_TYPE (fn
));
1460 tree parmnode
, argnode
;
1464 /* At this point we should not see any functions which haven't been
1465 explicitly declared, except for friend functions which will have
1466 been found using argument dependent lookup. */
1467 gcc_assert (!DECL_ANTICIPATED (fn
) || DECL_HIDDEN_FRIEND_P (fn
));
1469 /* The `this', `in_chrg' and VTT arguments to constructors are not
1470 considered in overload resolution. */
1471 if (DECL_CONSTRUCTOR_P (fn
))
1473 parmlist
= skip_artificial_parms_for (fn
, parmlist
);
1474 orig_arglist
= arglist
;
1475 arglist
= skip_artificial_parms_for (fn
, arglist
);
1478 orig_arglist
= arglist
;
1480 len
= list_length (arglist
);
1481 convs
= alloc_conversions (len
);
1483 /* 13.3.2 - Viable functions [over.match.viable]
1484 First, to be a viable function, a candidate function shall have enough
1485 parameters to agree in number with the arguments in the list.
1487 We need to check this first; otherwise, checking the ICSes might cause
1488 us to produce an ill-formed template instantiation. */
1490 parmnode
= parmlist
;
1491 for (i
= 0; i
< len
; ++i
)
1493 if (parmnode
== NULL_TREE
|| parmnode
== void_list_node
)
1495 parmnode
= TREE_CHAIN (parmnode
);
1498 if (i
< len
&& parmnode
)
1501 /* Make sure there are default args for the rest of the parms. */
1502 else if (!sufficient_parms_p (parmnode
))
1508 /* Second, for F to be a viable function, there shall exist for each
1509 argument an implicit conversion sequence that converts that argument
1510 to the corresponding parameter of F. */
1512 parmnode
= parmlist
;
1515 for (i
= 0; i
< len
; ++i
)
1517 tree arg
= TREE_VALUE (argnode
);
1518 tree argtype
= lvalue_type (arg
);
1522 if (parmnode
== void_list_node
)
1525 is_this
= (i
== 0 && DECL_NONSTATIC_MEMBER_FUNCTION_P (fn
)
1526 && ! DECL_CONSTRUCTOR_P (fn
));
1530 tree parmtype
= TREE_VALUE (parmnode
);
1533 /* The type of the implicit object parameter ('this') for
1534 overload resolution is not always the same as for the
1535 function itself; conversion functions are considered to
1536 be members of the class being converted, and functions
1537 introduced by a using-declaration are considered to be
1538 members of the class that uses them.
1540 Since build_over_call ignores the ICS for the `this'
1541 parameter, we can just change the parm type. */
1542 if (ctype
&& is_this
)
1545 = build_qualified_type (ctype
,
1546 TYPE_QUALS (TREE_TYPE (parmtype
)));
1547 parmtype
= build_pointer_type (parmtype
);
1550 if ((flags
& LOOKUP_NO_COPY_CTOR_CONVERSION
)
1551 && ctype
&& i
== 0 && DECL_COPY_CONSTRUCTOR_P (fn
))
1552 lflags
|= LOOKUP_NO_CONVERSION
;
1554 t
= implicit_conversion (parmtype
, argtype
, arg
,
1555 /*c_cast_p=*/false, lflags
);
1559 t
= build_identity_conv (argtype
, arg
);
1560 t
->ellipsis_p
= true;
1577 parmnode
= TREE_CHAIN (parmnode
);
1578 argnode
= TREE_CHAIN (argnode
);
1582 return add_candidate (candidates
, fn
, orig_arglist
, len
, convs
,
1583 access_path
, conversion_path
, viable
);
1586 /* Create an overload candidate for the conversion function FN which will
1587 be invoked for expression OBJ, producing a pointer-to-function which
1588 will in turn be called with the argument list ARGLIST, and add it to
1589 CANDIDATES. FLAGS is passed on to implicit_conversion.
1591 Actually, we don't really care about FN; we care about the type it
1592 converts to. There may be multiple conversion functions that will
1593 convert to that type, and we rely on build_user_type_conversion_1 to
1594 choose the best one; so when we create our candidate, we record the type
1595 instead of the function. */
1597 static struct z_candidate
*
1598 add_conv_candidate (struct z_candidate
**candidates
, tree fn
, tree obj
,
1599 tree arglist
, tree access_path
, tree conversion_path
)
1601 tree totype
= TREE_TYPE (TREE_TYPE (fn
));
1602 int i
, len
, viable
, flags
;
1603 tree parmlist
, parmnode
, argnode
;
1606 for (parmlist
= totype
; TREE_CODE (parmlist
) != FUNCTION_TYPE
; )
1607 parmlist
= TREE_TYPE (parmlist
);
1608 parmlist
= TYPE_ARG_TYPES (parmlist
);
1610 len
= list_length (arglist
) + 1;
1611 convs
= alloc_conversions (len
);
1612 parmnode
= parmlist
;
1615 flags
= LOOKUP_NORMAL
;
1617 /* Don't bother looking up the same type twice. */
1618 if (*candidates
&& (*candidates
)->fn
== totype
)
1621 for (i
= 0; i
< len
; ++i
)
1623 tree arg
= i
== 0 ? obj
: TREE_VALUE (argnode
);
1624 tree argtype
= lvalue_type (arg
);
1628 t
= implicit_conversion (totype
, argtype
, arg
, /*c_cast_p=*/false,
1630 else if (parmnode
== void_list_node
)
1633 t
= implicit_conversion (TREE_VALUE (parmnode
), argtype
, arg
,
1634 /*c_cast_p=*/false, flags
);
1637 t
= build_identity_conv (argtype
, arg
);
1638 t
->ellipsis_p
= true;
1652 parmnode
= TREE_CHAIN (parmnode
);
1653 argnode
= TREE_CHAIN (argnode
);
1659 if (!sufficient_parms_p (parmnode
))
1662 return add_candidate (candidates
, totype
, arglist
, len
, convs
,
1663 access_path
, conversion_path
, viable
);
1667 build_builtin_candidate (struct z_candidate
**candidates
, tree fnname
,
1668 tree type1
, tree type2
, tree
*args
, tree
*argtypes
,
1680 num_convs
= args
[2] ? 3 : (args
[1] ? 2 : 1);
1681 convs
= alloc_conversions (num_convs
);
1683 for (i
= 0; i
< 2; ++i
)
1688 t
= implicit_conversion (types
[i
], argtypes
[i
], args
[i
],
1689 /*c_cast_p=*/false, flags
);
1693 /* We need something for printing the candidate. */
1694 t
= build_identity_conv (types
[i
], NULL_TREE
);
1701 /* For COND_EXPR we rearranged the arguments; undo that now. */
1704 convs
[2] = convs
[1];
1705 convs
[1] = convs
[0];
1706 t
= implicit_conversion (boolean_type_node
, argtypes
[2], args
[2],
1707 /*c_cast_p=*/false, flags
);
1714 add_candidate (candidates
, fnname
, /*args=*/NULL_TREE
,
1716 /*access_path=*/NULL_TREE
,
1717 /*conversion_path=*/NULL_TREE
,
1722 is_complete (tree t
)
1724 return COMPLETE_TYPE_P (complete_type (t
));
1727 /* Returns nonzero if TYPE is a promoted arithmetic type. */
1730 promoted_arithmetic_type_p (tree type
)
1734 In this section, the term promoted integral type is used to refer
1735 to those integral types which are preserved by integral promotion
1736 (including e.g. int and long but excluding e.g. char).
1737 Similarly, the term promoted arithmetic type refers to promoted
1738 integral types plus floating types. */
1739 return ((INTEGRAL_TYPE_P (type
)
1740 && same_type_p (type_promotes_to (type
), type
))
1741 || TREE_CODE (type
) == REAL_TYPE
);
1744 /* Create any builtin operator overload candidates for the operator in
1745 question given the converted operand types TYPE1 and TYPE2. The other
1746 args are passed through from add_builtin_candidates to
1747 build_builtin_candidate.
1749 TYPE1 and TYPE2 may not be permissible, and we must filter them.
1750 If CODE is requires candidates operands of the same type of the kind
1751 of which TYPE1 and TYPE2 are, we add both candidates
1752 CODE (TYPE1, TYPE1) and CODE (TYPE2, TYPE2). */
1755 add_builtin_candidate (struct z_candidate
**candidates
, enum tree_code code
,
1756 enum tree_code code2
, tree fnname
, tree type1
,
1757 tree type2
, tree
*args
, tree
*argtypes
, int flags
)
1761 case POSTINCREMENT_EXPR
:
1762 case POSTDECREMENT_EXPR
:
1763 args
[1] = integer_zero_node
;
1764 type2
= integer_type_node
;
1773 /* 4 For every pair T, VQ), where T is an arithmetic or enumeration type,
1774 and VQ is either volatile or empty, there exist candidate operator
1775 functions of the form
1776 VQ T& operator++(VQ T&);
1777 T operator++(VQ T&, int);
1778 5 For every pair T, VQ), where T is an enumeration type or an arithmetic
1779 type other than bool, and VQ is either volatile or empty, there exist
1780 candidate operator functions of the form
1781 VQ T& operator--(VQ T&);
1782 T operator--(VQ T&, int);
1783 6 For every pair T, VQ), where T is a cv-qualified or cv-unqualified
1784 complete object type, and VQ is either volatile or empty, there exist
1785 candidate operator functions of the form
1786 T*VQ& operator++(T*VQ&);
1787 T*VQ& operator--(T*VQ&);
1788 T* operator++(T*VQ&, int);
1789 T* operator--(T*VQ&, int); */
1791 case POSTDECREMENT_EXPR
:
1792 case PREDECREMENT_EXPR
:
1793 if (TREE_CODE (type1
) == BOOLEAN_TYPE
)
1795 case POSTINCREMENT_EXPR
:
1796 case PREINCREMENT_EXPR
:
1797 if (ARITHMETIC_TYPE_P (type1
) || TYPE_PTROB_P (type1
))
1799 type1
= build_reference_type (type1
);
1804 /* 7 For every cv-qualified or cv-unqualified complete object type T, there
1805 exist candidate operator functions of the form
1809 8 For every function type T, there exist candidate operator functions of
1811 T& operator*(T*); */
1814 if (TREE_CODE (type1
) == POINTER_TYPE
1815 && (TYPE_PTROB_P (type1
)
1816 || TREE_CODE (TREE_TYPE (type1
)) == FUNCTION_TYPE
))
1820 /* 9 For every type T, there exist candidate operator functions of the form
1823 10For every promoted arithmetic type T, there exist candidate operator
1824 functions of the form
1828 case UNARY_PLUS_EXPR
: /* unary + */
1829 if (TREE_CODE (type1
) == POINTER_TYPE
)
1832 if (ARITHMETIC_TYPE_P (type1
))
1836 /* 11For every promoted integral type T, there exist candidate operator
1837 functions of the form
1841 if (INTEGRAL_TYPE_P (type1
))
1845 /* 12For every quintuple C1, C2, T, CV1, CV2), where C2 is a class type, C1
1846 is the same type as C2 or is a derived class of C2, T is a complete
1847 object type or a function type, and CV1 and CV2 are cv-qualifier-seqs,
1848 there exist candidate operator functions of the form
1849 CV12 T& operator->*(CV1 C1*, CV2 T C2::*);
1850 where CV12 is the union of CV1 and CV2. */
1853 if (TREE_CODE (type1
) == POINTER_TYPE
1854 && TYPE_PTR_TO_MEMBER_P (type2
))
1856 tree c1
= TREE_TYPE (type1
);
1857 tree c2
= TYPE_PTRMEM_CLASS_TYPE (type2
);
1859 if (MAYBE_CLASS_TYPE_P (c1
) && DERIVED_FROM_P (c2
, c1
)
1860 && (TYPE_PTRMEMFUNC_P (type2
)
1861 || is_complete (TYPE_PTRMEM_POINTED_TO_TYPE (type2
))))
1866 /* 13For every pair of promoted arithmetic types L and R, there exist can-
1867 didate operator functions of the form
1872 bool operator<(L, R);
1873 bool operator>(L, R);
1874 bool operator<=(L, R);
1875 bool operator>=(L, R);
1876 bool operator==(L, R);
1877 bool operator!=(L, R);
1878 where LR is the result of the usual arithmetic conversions between
1881 14For every pair of types T and I, where T is a cv-qualified or cv-
1882 unqualified complete object type and I is a promoted integral type,
1883 there exist candidate operator functions of the form
1884 T* operator+(T*, I);
1885 T& operator[](T*, I);
1886 T* operator-(T*, I);
1887 T* operator+(I, T*);
1888 T& operator[](I, T*);
1890 15For every T, where T is a pointer to complete object type, there exist
1891 candidate operator functions of the form112)
1892 ptrdiff_t operator-(T, T);
1894 16For every pointer or enumeration type T, there exist candidate operator
1895 functions of the form
1896 bool operator<(T, T);
1897 bool operator>(T, T);
1898 bool operator<=(T, T);
1899 bool operator>=(T, T);
1900 bool operator==(T, T);
1901 bool operator!=(T, T);
1903 17For every pointer to member type T, there exist candidate operator
1904 functions of the form
1905 bool operator==(T, T);
1906 bool operator!=(T, T); */
1909 if (TYPE_PTROB_P (type1
) && TYPE_PTROB_P (type2
))
1911 if (TYPE_PTROB_P (type1
) && INTEGRAL_TYPE_P (type2
))
1913 type2
= ptrdiff_type_node
;
1917 case TRUNC_DIV_EXPR
:
1918 if (ARITHMETIC_TYPE_P (type1
) && ARITHMETIC_TYPE_P (type2
))
1924 if ((TYPE_PTRMEMFUNC_P (type1
) && TYPE_PTRMEMFUNC_P (type2
))
1925 || (TYPE_PTRMEM_P (type1
) && TYPE_PTRMEM_P (type2
)))
1927 if (TYPE_PTR_TO_MEMBER_P (type1
) && null_ptr_cst_p (args
[1]))
1932 if (TYPE_PTR_TO_MEMBER_P (type2
) && null_ptr_cst_p (args
[0]))
1944 if (ARITHMETIC_TYPE_P (type1
) && ARITHMETIC_TYPE_P (type2
))
1946 if (TYPE_PTR_P (type1
) && TYPE_PTR_P (type2
))
1948 if (TREE_CODE (type1
) == ENUMERAL_TYPE
1949 && TREE_CODE (type2
) == ENUMERAL_TYPE
)
1951 if (TYPE_PTR_P (type1
)
1952 && null_ptr_cst_p (args
[1])
1953 && !uses_template_parms (type1
))
1958 if (null_ptr_cst_p (args
[0])
1959 && TYPE_PTR_P (type2
)
1960 && !uses_template_parms (type2
))
1968 if (ARITHMETIC_TYPE_P (type1
) && ARITHMETIC_TYPE_P (type2
))
1971 if (INTEGRAL_TYPE_P (type1
) && TYPE_PTROB_P (type2
))
1973 type1
= ptrdiff_type_node
;
1976 if (TYPE_PTROB_P (type1
) && INTEGRAL_TYPE_P (type2
))
1978 type2
= ptrdiff_type_node
;
1983 /* 18For every pair of promoted integral types L and R, there exist candi-
1984 date operator functions of the form
1991 where LR is the result of the usual arithmetic conversions between
1994 case TRUNC_MOD_EXPR
:
2000 if (INTEGRAL_TYPE_P (type1
) && INTEGRAL_TYPE_P (type2
))
2004 /* 19For every triple L, VQ, R), where L is an arithmetic or enumeration
2005 type, VQ is either volatile or empty, and R is a promoted arithmetic
2006 type, there exist candidate operator functions of the form
2007 VQ L& operator=(VQ L&, R);
2008 VQ L& operator*=(VQ L&, R);
2009 VQ L& operator/=(VQ L&, R);
2010 VQ L& operator+=(VQ L&, R);
2011 VQ L& operator-=(VQ L&, R);
2013 20For every pair T, VQ), where T is any type and VQ is either volatile
2014 or empty, there exist candidate operator functions of the form
2015 T*VQ& operator=(T*VQ&, T*);
2017 21For every pair T, VQ), where T is a pointer to member type and VQ is
2018 either volatile or empty, there exist candidate operator functions of
2020 VQ T& operator=(VQ T&, T);
2022 22For every triple T, VQ, I), where T is a cv-qualified or cv-
2023 unqualified complete object type, VQ is either volatile or empty, and
2024 I is a promoted integral type, there exist candidate operator func-
2026 T*VQ& operator+=(T*VQ&, I);
2027 T*VQ& operator-=(T*VQ&, I);
2029 23For every triple L, VQ, R), where L is an integral or enumeration
2030 type, VQ is either volatile or empty, and R is a promoted integral
2031 type, there exist candidate operator functions of the form
2033 VQ L& operator%=(VQ L&, R);
2034 VQ L& operator<<=(VQ L&, R);
2035 VQ L& operator>>=(VQ L&, R);
2036 VQ L& operator&=(VQ L&, R);
2037 VQ L& operator^=(VQ L&, R);
2038 VQ L& operator|=(VQ L&, R); */
2045 if (TYPE_PTROB_P (type1
) && INTEGRAL_TYPE_P (type2
))
2047 type2
= ptrdiff_type_node
;
2051 case TRUNC_DIV_EXPR
:
2052 if (ARITHMETIC_TYPE_P (type1
) && ARITHMETIC_TYPE_P (type2
))
2056 case TRUNC_MOD_EXPR
:
2062 if (INTEGRAL_TYPE_P (type1
) && INTEGRAL_TYPE_P (type2
))
2067 if (ARITHMETIC_TYPE_P (type1
) && ARITHMETIC_TYPE_P (type2
))
2069 if ((TYPE_PTRMEMFUNC_P (type1
) && TYPE_PTRMEMFUNC_P (type2
))
2070 || (TYPE_PTR_P (type1
) && TYPE_PTR_P (type2
))
2071 || (TYPE_PTRMEM_P (type1
) && TYPE_PTRMEM_P (type2
))
2072 || ((TYPE_PTRMEMFUNC_P (type1
)
2073 || TREE_CODE (type1
) == POINTER_TYPE
)
2074 && null_ptr_cst_p (args
[1])))
2084 type1
= build_reference_type (type1
);
2090 For every pair of promoted arithmetic types L and R, there
2091 exist candidate operator functions of the form
2093 LR operator?(bool, L, R);
2095 where LR is the result of the usual arithmetic conversions
2096 between types L and R.
2098 For every type T, where T is a pointer or pointer-to-member
2099 type, there exist candidate operator functions of the form T
2100 operator?(bool, T, T); */
2102 if (promoted_arithmetic_type_p (type1
)
2103 && promoted_arithmetic_type_p (type2
))
2107 /* Otherwise, the types should be pointers. */
2108 if (!(TYPE_PTR_P (type1
) || TYPE_PTR_TO_MEMBER_P (type1
))
2109 || !(TYPE_PTR_P (type2
) || TYPE_PTR_TO_MEMBER_P (type2
)))
2112 /* We don't check that the two types are the same; the logic
2113 below will actually create two candidates; one in which both
2114 parameter types are TYPE1, and one in which both parameter
2122 /* If we're dealing with two pointer types or two enumeral types,
2123 we need candidates for both of them. */
2124 if (type2
&& !same_type_p (type1
, type2
)
2125 && TREE_CODE (type1
) == TREE_CODE (type2
)
2126 && (TREE_CODE (type1
) == REFERENCE_TYPE
2127 || (TYPE_PTR_P (type1
) && TYPE_PTR_P (type2
))
2128 || (TYPE_PTRMEM_P (type1
) && TYPE_PTRMEM_P (type2
))
2129 || TYPE_PTRMEMFUNC_P (type1
)
2130 || MAYBE_CLASS_TYPE_P (type1
)
2131 || TREE_CODE (type1
) == ENUMERAL_TYPE
))
2133 build_builtin_candidate
2134 (candidates
, fnname
, type1
, type1
, args
, argtypes
, flags
);
2135 build_builtin_candidate
2136 (candidates
, fnname
, type2
, type2
, args
, argtypes
, flags
);
2140 build_builtin_candidate
2141 (candidates
, fnname
, type1
, type2
, args
, argtypes
, flags
);
2145 type_decays_to (tree type
)
2147 if (TREE_CODE (type
) == ARRAY_TYPE
)
2148 return build_pointer_type (TREE_TYPE (type
));
2149 if (TREE_CODE (type
) == FUNCTION_TYPE
)
2150 return build_pointer_type (type
);
2154 /* There are three conditions of builtin candidates:
2156 1) bool-taking candidates. These are the same regardless of the input.
2157 2) pointer-pair taking candidates. These are generated for each type
2158 one of the input types converts to.
2159 3) arithmetic candidates. According to the standard, we should generate
2160 all of these, but I'm trying not to...
2162 Here we generate a superset of the possible candidates for this particular
2163 case. That is a subset of the full set the standard defines, plus some
2164 other cases which the standard disallows. add_builtin_candidate will
2165 filter out the invalid set. */
2168 add_builtin_candidates (struct z_candidate
**candidates
, enum tree_code code
,
2169 enum tree_code code2
, tree fnname
, tree
*args
,
2174 tree type
, argtypes
[3];
2175 /* TYPES[i] is the set of possible builtin-operator parameter types
2176 we will consider for the Ith argument. These are represented as
2177 a TREE_LIST; the TREE_VALUE of each node is the potential
2181 for (i
= 0; i
< 3; ++i
)
2184 argtypes
[i
] = unlowered_expr_type (args
[i
]);
2186 argtypes
[i
] = NULL_TREE
;
2191 /* 4 For every pair T, VQ), where T is an arithmetic or enumeration type,
2192 and VQ is either volatile or empty, there exist candidate operator
2193 functions of the form
2194 VQ T& operator++(VQ T&); */
2196 case POSTINCREMENT_EXPR
:
2197 case PREINCREMENT_EXPR
:
2198 case POSTDECREMENT_EXPR
:
2199 case PREDECREMENT_EXPR
:
2204 /* 24There also exist candidate operator functions of the form
2205 bool operator!(bool);
2206 bool operator&&(bool, bool);
2207 bool operator||(bool, bool); */
2209 case TRUTH_NOT_EXPR
:
2210 build_builtin_candidate
2211 (candidates
, fnname
, boolean_type_node
,
2212 NULL_TREE
, args
, argtypes
, flags
);
2215 case TRUTH_ORIF_EXPR
:
2216 case TRUTH_ANDIF_EXPR
:
2217 build_builtin_candidate
2218 (candidates
, fnname
, boolean_type_node
,
2219 boolean_type_node
, args
, argtypes
, flags
);
2241 types
[0] = types
[1] = NULL_TREE
;
2243 for (i
= 0; i
< 2; ++i
)
2247 else if (MAYBE_CLASS_TYPE_P (argtypes
[i
]))
2251 if (i
== 0 && code
== MODIFY_EXPR
&& code2
== NOP_EXPR
)
2254 convs
= lookup_conversions (argtypes
[i
]);
2256 if (code
== COND_EXPR
)
2258 if (real_lvalue_p (args
[i
]))
2259 types
[i
] = tree_cons
2260 (NULL_TREE
, build_reference_type (argtypes
[i
]), types
[i
]);
2262 types
[i
] = tree_cons
2263 (NULL_TREE
, TYPE_MAIN_VARIANT (argtypes
[i
]), types
[i
]);
2269 for (; convs
; convs
= TREE_CHAIN (convs
))
2271 type
= TREE_TYPE (TREE_TYPE (OVL_CURRENT (TREE_VALUE (convs
))));
2274 && (TREE_CODE (type
) != REFERENCE_TYPE
2275 || CP_TYPE_CONST_P (TREE_TYPE (type
))))
2278 if (code
== COND_EXPR
&& TREE_CODE (type
) == REFERENCE_TYPE
)
2279 types
[i
] = tree_cons (NULL_TREE
, type
, types
[i
]);
2281 type
= non_reference (type
);
2282 if (i
!= 0 || ! ref1
)
2284 type
= TYPE_MAIN_VARIANT (type_decays_to (type
));
2285 if (enum_p
&& TREE_CODE (type
) == ENUMERAL_TYPE
)
2286 types
[i
] = tree_cons (NULL_TREE
, type
, types
[i
]);
2287 if (INTEGRAL_TYPE_P (type
))
2288 type
= type_promotes_to (type
);
2291 if (! value_member (type
, types
[i
]))
2292 types
[i
] = tree_cons (NULL_TREE
, type
, types
[i
]);
2297 if (code
== COND_EXPR
&& real_lvalue_p (args
[i
]))
2298 types
[i
] = tree_cons
2299 (NULL_TREE
, build_reference_type (argtypes
[i
]), types
[i
]);
2300 type
= non_reference (argtypes
[i
]);
2301 if (i
!= 0 || ! ref1
)
2303 type
= TYPE_MAIN_VARIANT (type_decays_to (type
));
2304 if (enum_p
&& TREE_CODE (type
) == ENUMERAL_TYPE
)
2305 types
[i
] = tree_cons (NULL_TREE
, type
, types
[i
]);
2306 if (INTEGRAL_TYPE_P (type
))
2307 type
= type_promotes_to (type
);
2309 types
[i
] = tree_cons (NULL_TREE
, type
, types
[i
]);
2313 /* Run through the possible parameter types of both arguments,
2314 creating candidates with those parameter types. */
2315 for (; types
[0]; types
[0] = TREE_CHAIN (types
[0]))
2318 for (type
= types
[1]; type
; type
= TREE_CHAIN (type
))
2319 add_builtin_candidate
2320 (candidates
, code
, code2
, fnname
, TREE_VALUE (types
[0]),
2321 TREE_VALUE (type
), args
, argtypes
, flags
);
2323 add_builtin_candidate
2324 (candidates
, code
, code2
, fnname
, TREE_VALUE (types
[0]),
2325 NULL_TREE
, args
, argtypes
, flags
);
2330 /* If TMPL can be successfully instantiated as indicated by
2331 EXPLICIT_TARGS and ARGLIST, adds the instantiation to CANDIDATES.
2333 TMPL is the template. EXPLICIT_TARGS are any explicit template
2334 arguments. ARGLIST is the arguments provided at the call-site.
2335 The RETURN_TYPE is the desired type for conversion operators. If
2336 OBJ is NULL_TREE, FLAGS and CTYPE are as for add_function_candidate.
2337 If an OBJ is supplied, FLAGS and CTYPE are ignored, and OBJ is as for
2338 add_conv_candidate. */
2340 static struct z_candidate
*
2341 add_template_candidate_real (struct z_candidate
**candidates
, tree tmpl
,
2342 tree ctype
, tree explicit_targs
, tree arglist
,
2343 tree return_type
, tree access_path
,
2344 tree conversion_path
, int flags
, tree obj
,
2345 unification_kind_t strict
)
2347 int ntparms
= DECL_NTPARMS (tmpl
);
2348 tree targs
= make_tree_vec (ntparms
);
2349 tree args_without_in_chrg
= arglist
;
2350 struct z_candidate
*cand
;
2354 /* We don't do deduction on the in-charge parameter, the VTT
2355 parameter or 'this'. */
2356 if (DECL_NONSTATIC_MEMBER_FUNCTION_P (tmpl
))
2357 args_without_in_chrg
= TREE_CHAIN (args_without_in_chrg
);
2359 if ((DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (tmpl
)
2360 || DECL_BASE_CONSTRUCTOR_P (tmpl
))
2361 && CLASSTYPE_VBASECLASSES (DECL_CONTEXT (tmpl
)))
2362 args_without_in_chrg
= TREE_CHAIN (args_without_in_chrg
);
2364 i
= fn_type_unification (tmpl
, explicit_targs
, targs
,
2365 args_without_in_chrg
,
2366 return_type
, strict
, flags
);
2371 fn
= instantiate_template (tmpl
, targs
, tf_none
);
2372 if (fn
== error_mark_node
)
2377 A member function template is never instantiated to perform the
2378 copy of a class object to an object of its class type.
2380 It's a little unclear what this means; the standard explicitly
2381 does allow a template to be used to copy a class. For example,
2386 template <class T> A(const T&);
2389 void g () { A a (f ()); }
2391 the member template will be used to make the copy. The section
2392 quoted above appears in the paragraph that forbids constructors
2393 whose only parameter is (a possibly cv-qualified variant of) the
2394 class type, and a logical interpretation is that the intent was
2395 to forbid the instantiation of member templates which would then
2397 if (DECL_CONSTRUCTOR_P (fn
) && list_length (arglist
) == 2)
2399 tree arg_types
= FUNCTION_FIRST_USER_PARMTYPE (fn
);
2400 if (arg_types
&& same_type_p (TYPE_MAIN_VARIANT (TREE_VALUE (arg_types
)),
2405 if (obj
!= NULL_TREE
)
2406 /* Aha, this is a conversion function. */
2407 cand
= add_conv_candidate (candidates
, fn
, obj
, access_path
,
2408 conversion_path
, arglist
);
2410 cand
= add_function_candidate (candidates
, fn
, ctype
,
2411 arglist
, access_path
,
2412 conversion_path
, flags
);
2413 if (DECL_TI_TEMPLATE (fn
) != tmpl
)
2414 /* This situation can occur if a member template of a template
2415 class is specialized. Then, instantiate_template might return
2416 an instantiation of the specialization, in which case the
2417 DECL_TI_TEMPLATE field will point at the original
2418 specialization. For example:
2420 template <class T> struct S { template <class U> void f(U);
2421 template <> void f(int) {}; };
2425 Here, TMPL will be template <class U> S<double>::f(U).
2426 And, instantiate template will give us the specialization
2427 template <> S<double>::f(int). But, the DECL_TI_TEMPLATE field
2428 for this will point at template <class T> template <> S<T>::f(int),
2429 so that we can find the definition. For the purposes of
2430 overload resolution, however, we want the original TMPL. */
2431 cand
->template_decl
= tree_cons (tmpl
, targs
, NULL_TREE
);
2433 cand
->template_decl
= DECL_TEMPLATE_INFO (fn
);
2439 static struct z_candidate
*
2440 add_template_candidate (struct z_candidate
**candidates
, tree tmpl
, tree ctype
,
2441 tree explicit_targs
, tree arglist
, tree return_type
,
2442 tree access_path
, tree conversion_path
, int flags
,
2443 unification_kind_t strict
)
2446 add_template_candidate_real (candidates
, tmpl
, ctype
,
2447 explicit_targs
, arglist
, return_type
,
2448 access_path
, conversion_path
,
2449 flags
, NULL_TREE
, strict
);
2453 static struct z_candidate
*
2454 add_template_conv_candidate (struct z_candidate
**candidates
, tree tmpl
,
2455 tree obj
, tree arglist
, tree return_type
,
2456 tree access_path
, tree conversion_path
)
2459 add_template_candidate_real (candidates
, tmpl
, NULL_TREE
, NULL_TREE
,
2460 arglist
, return_type
, access_path
,
2461 conversion_path
, 0, obj
, DEDUCE_CONV
);
2464 /* The CANDS are the set of candidates that were considered for
2465 overload resolution. Return the set of viable candidates. If none
2466 of the candidates were viable, set *ANY_VIABLE_P to true. STRICT_P
2467 is true if a candidate should be considered viable only if it is
2470 static struct z_candidate
*
2471 splice_viable (struct z_candidate
*cands
,
2475 struct z_candidate
*viable
;
2476 struct z_candidate
**last_viable
;
2477 struct z_candidate
**cand
;
2480 last_viable
= &viable
;
2481 *any_viable_p
= false;
2486 struct z_candidate
*c
= *cand
;
2487 if (strict_p
? c
->viable
== 1 : c
->viable
)
2492 last_viable
= &c
->next
;
2493 *any_viable_p
= true;
2499 return viable
? viable
: cands
;
2503 any_strictly_viable (struct z_candidate
*cands
)
2505 for (; cands
; cands
= cands
->next
)
2506 if (cands
->viable
== 1)
2511 /* OBJ is being used in an expression like "OBJ.f (...)". In other
2512 words, it is about to become the "this" pointer for a member
2513 function call. Take the address of the object. */
2516 build_this (tree obj
)
2518 /* In a template, we are only concerned about the type of the
2519 expression, so we can take a shortcut. */
2520 if (processing_template_decl
)
2521 return build_address (obj
);
2523 return cp_build_unary_op (ADDR_EXPR
, obj
, 0, tf_warning_or_error
);
2526 /* Returns true iff functions are equivalent. Equivalent functions are
2527 not '==' only if one is a function-local extern function or if
2528 both are extern "C". */
2531 equal_functions (tree fn1
, tree fn2
)
2533 if (DECL_LOCAL_FUNCTION_P (fn1
) || DECL_LOCAL_FUNCTION_P (fn2
)
2534 || DECL_EXTERN_C_FUNCTION_P (fn1
))
2535 return decls_match (fn1
, fn2
);
2539 /* Print information about one overload candidate CANDIDATE. MSGSTR
2540 is the text to print before the candidate itself.
2542 NOTE: Unlike most diagnostic functions in GCC, MSGSTR is expected
2543 to have been run through gettext by the caller. This wart makes
2544 life simpler in print_z_candidates and for the translators. */
2547 print_z_candidate (const char *msgstr
, struct z_candidate
*candidate
)
2549 if (TREE_CODE (candidate
->fn
) == IDENTIFIER_NODE
)
2551 if (candidate
->num_convs
== 3)
2552 inform (input_location
, "%s %D(%T, %T, %T) <built-in>", msgstr
, candidate
->fn
,
2553 candidate
->convs
[0]->type
,
2554 candidate
->convs
[1]->type
,
2555 candidate
->convs
[2]->type
);
2556 else if (candidate
->num_convs
== 2)
2557 inform (input_location
, "%s %D(%T, %T) <built-in>", msgstr
, candidate
->fn
,
2558 candidate
->convs
[0]->type
,
2559 candidate
->convs
[1]->type
);
2561 inform (input_location
, "%s %D(%T) <built-in>", msgstr
, candidate
->fn
,
2562 candidate
->convs
[0]->type
);
2564 else if (TYPE_P (candidate
->fn
))
2565 inform (input_location
, "%s %T <conversion>", msgstr
, candidate
->fn
);
2566 else if (candidate
->viable
== -1)
2567 inform (input_location
, "%s %+#D <near match>", msgstr
, candidate
->fn
);
2569 inform (input_location
, "%s %+#D", msgstr
, candidate
->fn
);
2573 print_z_candidates (struct z_candidate
*candidates
)
2576 struct z_candidate
*cand1
;
2577 struct z_candidate
**cand2
;
2579 /* There may be duplicates in the set of candidates. We put off
2580 checking this condition as long as possible, since we have no way
2581 to eliminate duplicates from a set of functions in less than n^2
2582 time. Now we are about to emit an error message, so it is more
2583 permissible to go slowly. */
2584 for (cand1
= candidates
; cand1
; cand1
= cand1
->next
)
2586 tree fn
= cand1
->fn
;
2587 /* Skip builtin candidates and conversion functions. */
2588 if (TREE_CODE (fn
) != FUNCTION_DECL
)
2590 cand2
= &cand1
->next
;
2593 if (TREE_CODE ((*cand2
)->fn
) == FUNCTION_DECL
2594 && equal_functions (fn
, (*cand2
)->fn
))
2595 *cand2
= (*cand2
)->next
;
2597 cand2
= &(*cand2
)->next
;
2604 str
= _("candidates are:");
2605 print_z_candidate (str
, candidates
);
2606 if (candidates
->next
)
2608 /* Indent successive candidates by the width of the translation
2609 of the above string. */
2610 size_t len
= gcc_gettext_width (str
) + 1;
2611 char *spaces
= (char *) alloca (len
);
2612 memset (spaces
, ' ', len
-1);
2613 spaces
[len
- 1] = '\0';
2615 candidates
= candidates
->next
;
2618 print_z_candidate (spaces
, candidates
);
2619 candidates
= candidates
->next
;
2625 /* USER_SEQ is a user-defined conversion sequence, beginning with a
2626 USER_CONV. STD_SEQ is the standard conversion sequence applied to
2627 the result of the conversion function to convert it to the final
2628 desired type. Merge the two sequences into a single sequence,
2629 and return the merged sequence. */
2632 merge_conversion_sequences (conversion
*user_seq
, conversion
*std_seq
)
2636 gcc_assert (user_seq
->kind
== ck_user
);
2638 /* Find the end of the second conversion sequence. */
2640 while ((*t
)->kind
!= ck_identity
)
2641 t
= &((*t
)->u
.next
);
2643 /* Replace the identity conversion with the user conversion
2647 /* The entire sequence is a user-conversion sequence. */
2648 std_seq
->user_conv_p
= true;
2653 /* Returns the best overload candidate to perform the requested
2654 conversion. This function is used for three the overloading situations
2655 described in [over.match.copy], [over.match.conv], and [over.match.ref].
2656 If TOTYPE is a REFERENCE_TYPE, we're trying to find an lvalue binding as
2657 per [dcl.init.ref], so we ignore temporary bindings. */
2659 static struct z_candidate
*
2660 build_user_type_conversion_1 (tree totype
, tree expr
, int flags
)
2662 struct z_candidate
*candidates
, *cand
;
2663 tree fromtype
= TREE_TYPE (expr
);
2664 tree ctors
= NULL_TREE
;
2665 tree conv_fns
= NULL_TREE
;
2666 conversion
*conv
= NULL
;
2667 tree args
= NULL_TREE
;
2671 /* We represent conversion within a hierarchy using RVALUE_CONV and
2672 BASE_CONV, as specified by [over.best.ics]; these become plain
2673 constructor calls, as specified in [dcl.init]. */
2674 gcc_assert (!MAYBE_CLASS_TYPE_P (fromtype
) || !MAYBE_CLASS_TYPE_P (totype
)
2675 || !DERIVED_FROM_P (totype
, fromtype
));
2677 if (MAYBE_CLASS_TYPE_P (totype
))
2678 ctors
= lookup_fnfields (totype
, complete_ctor_identifier
, 0);
2680 if (MAYBE_CLASS_TYPE_P (fromtype
))
2682 tree to_nonref
= non_reference (totype
);
2683 if (same_type_ignoring_top_level_qualifiers_p (to_nonref
, fromtype
) ||
2684 (CLASS_TYPE_P (to_nonref
) && CLASS_TYPE_P (fromtype
)
2685 && DERIVED_FROM_P (to_nonref
, fromtype
)))
2687 /* [class.conv.fct] A conversion function is never used to
2688 convert a (possibly cv-qualified) object to the (possibly
2689 cv-qualified) same object type (or a reference to it), to a
2690 (possibly cv-qualified) base class of that type (or a
2691 reference to it)... */
2694 conv_fns
= lookup_conversions (fromtype
);
2698 flags
|= LOOKUP_NO_CONVERSION
;
2700 /* It's OK to bind a temporary for converting constructor arguments, but
2701 not in converting the return value of a conversion operator. */
2702 convflags
= ((flags
& LOOKUP_NO_TEMP_BIND
) | LOOKUP_NO_CONVERSION
);
2703 flags
&= ~LOOKUP_NO_TEMP_BIND
;
2709 ctors
= BASELINK_FUNCTIONS (ctors
);
2711 t
= build_int_cst (build_pointer_type (totype
), 0);
2712 if (BRACE_ENCLOSED_INITIALIZER_P (expr
)
2713 && !TYPE_HAS_LIST_CTOR (totype
))
2715 args
= ctor_to_list (expr
);
2716 /* We still allow more conversions within an init-list. */
2717 flags
= ((flags
& ~LOOKUP_NO_CONVERSION
)
2718 /* But not for the copy ctor. */
2719 |LOOKUP_NO_COPY_CTOR_CONVERSION
2720 |LOOKUP_NO_NARROWING
);
2723 args
= build_tree_list (NULL_TREE
, expr
);
2724 /* We should never try to call the abstract or base constructor
2726 gcc_assert (!DECL_HAS_IN_CHARGE_PARM_P (OVL_CURRENT (ctors
))
2727 && !DECL_HAS_VTT_PARM_P (OVL_CURRENT (ctors
)));
2728 args
= tree_cons (NULL_TREE
, t
, args
);
2730 for (; ctors
; ctors
= OVL_NEXT (ctors
))
2732 tree ctor
= OVL_CURRENT (ctors
);
2733 if (DECL_NONCONVERTING_P (ctor
)
2734 && !BRACE_ENCLOSED_INITIALIZER_P (expr
))
2737 if (TREE_CODE (ctor
) == TEMPLATE_DECL
)
2738 cand
= add_template_candidate (&candidates
, ctor
, totype
,
2739 NULL_TREE
, args
, NULL_TREE
,
2740 TYPE_BINFO (totype
),
2741 TYPE_BINFO (totype
),
2745 cand
= add_function_candidate (&candidates
, ctor
, totype
,
2746 args
, TYPE_BINFO (totype
),
2747 TYPE_BINFO (totype
),
2752 cand
->second_conv
= build_identity_conv (totype
, NULL_TREE
);
2754 /* If totype isn't a reference, and LOOKUP_NO_TEMP_BIND isn't
2755 set, then this is copy-initialization. In that case, "The
2756 result of the call is then used to direct-initialize the
2757 object that is the destination of the copy-initialization."
2760 We represent this in the conversion sequence with an
2761 rvalue conversion, which means a constructor call. */
2762 if (TREE_CODE (totype
) != REFERENCE_TYPE
2763 && !(convflags
& LOOKUP_NO_TEMP_BIND
))
2765 = build_conv (ck_rvalue
, totype
, cand
->second_conv
);
2770 args
= build_tree_list (NULL_TREE
, build_this (expr
));
2772 for (; conv_fns
; conv_fns
= TREE_CHAIN (conv_fns
))
2775 tree conversion_path
= TREE_PURPOSE (conv_fns
);
2777 /* If we are called to convert to a reference type, we are trying to
2778 find an lvalue binding, so don't even consider temporaries. If
2779 we don't find an lvalue binding, the caller will try again to
2780 look for a temporary binding. */
2781 if (TREE_CODE (totype
) == REFERENCE_TYPE
)
2782 convflags
|= LOOKUP_NO_TEMP_BIND
;
2784 for (fns
= TREE_VALUE (conv_fns
); fns
; fns
= OVL_NEXT (fns
))
2786 tree fn
= OVL_CURRENT (fns
);
2788 /* [over.match.funcs] For conversion functions, the function
2789 is considered to be a member of the class of the implicit
2790 object argument for the purpose of defining the type of
2791 the implicit object parameter.
2793 So we pass fromtype as CTYPE to add_*_candidate. */
2795 if (TREE_CODE (fn
) == TEMPLATE_DECL
)
2796 cand
= add_template_candidate (&candidates
, fn
, fromtype
,
2799 TYPE_BINFO (fromtype
),
2804 cand
= add_function_candidate (&candidates
, fn
, fromtype
,
2806 TYPE_BINFO (fromtype
),
2813 = implicit_conversion (totype
,
2814 TREE_TYPE (TREE_TYPE (cand
->fn
)),
2816 /*c_cast_p=*/false, convflags
);
2818 /* If LOOKUP_NO_TEMP_BIND isn't set, then this is
2819 copy-initialization. In that case, "The result of the
2820 call is then used to direct-initialize the object that is
2821 the destination of the copy-initialization." [dcl.init]
2823 We represent this in the conversion sequence with an
2824 rvalue conversion, which means a constructor call. But
2825 don't add a second rvalue conversion if there's already
2826 one there. Which there really shouldn't be, but it's
2827 harmless since we'd add it here anyway. */
2828 if (ics
&& MAYBE_CLASS_TYPE_P (totype
) && ics
->kind
!= ck_rvalue
2829 && !(convflags
& LOOKUP_NO_TEMP_BIND
))
2830 ics
= build_conv (ck_rvalue
, totype
, ics
);
2832 cand
->second_conv
= ics
;
2836 else if (candidates
->viable
== 1 && ics
->bad_p
)
2842 candidates
= splice_viable (candidates
, pedantic
, &any_viable_p
);
2846 cand
= tourney (candidates
);
2849 if (flags
& LOOKUP_COMPLAIN
)
2851 error ("conversion from %qT to %qT is ambiguous",
2853 print_z_candidates (candidates
);
2856 cand
= candidates
; /* any one will do */
2857 cand
->second_conv
= build_ambiguous_conv (totype
, expr
);
2858 cand
->second_conv
->user_conv_p
= true;
2859 if (!any_strictly_viable (candidates
))
2860 cand
->second_conv
->bad_p
= true;
2861 /* If there are viable candidates, don't set ICS_BAD_FLAG; an
2862 ambiguous conversion is no worse than another user-defined
2868 /* Build the user conversion sequence. */
2871 (DECL_CONSTRUCTOR_P (cand
->fn
)
2872 ? totype
: non_reference (TREE_TYPE (TREE_TYPE (cand
->fn
)))),
2873 build_identity_conv (TREE_TYPE (expr
), expr
));
2876 /* Remember that this was a list-initialization. */
2877 if (flags
& LOOKUP_NO_NARROWING
)
2878 conv
->check_narrowing
= true;
2880 /* Combine it with the second conversion sequence. */
2881 cand
->second_conv
= merge_conversion_sequences (conv
,
2884 if (cand
->viable
== -1)
2885 cand
->second_conv
->bad_p
= true;
2891 build_user_type_conversion (tree totype
, tree expr
, int flags
)
2893 struct z_candidate
*cand
2894 = build_user_type_conversion_1 (totype
, expr
, flags
);
2898 if (cand
->second_conv
->kind
== ck_ambig
)
2899 return error_mark_node
;
2900 expr
= convert_like (cand
->second_conv
, expr
, tf_warning_or_error
);
2901 return convert_from_reference (expr
);
2906 /* Do any initial processing on the arguments to a function call. */
2909 resolve_args (tree args
)
2912 for (t
= args
; t
; t
= TREE_CHAIN (t
))
2914 tree arg
= TREE_VALUE (t
);
2916 if (error_operand_p (arg
))
2917 return error_mark_node
;
2918 else if (VOID_TYPE_P (TREE_TYPE (arg
)))
2920 error ("invalid use of void expression");
2921 return error_mark_node
;
2923 else if (invalid_nonstatic_memfn_p (arg
, tf_warning_or_error
))
2924 return error_mark_node
;
2929 /* Perform overload resolution on FN, which is called with the ARGS.
2931 Return the candidate function selected by overload resolution, or
2932 NULL if the event that overload resolution failed. In the case
2933 that overload resolution fails, *CANDIDATES will be the set of
2934 candidates considered, and ANY_VIABLE_P will be set to true or
2935 false to indicate whether or not any of the candidates were
2938 The ARGS should already have gone through RESOLVE_ARGS before this
2939 function is called. */
2941 static struct z_candidate
*
2942 perform_overload_resolution (tree fn
,
2944 struct z_candidate
**candidates
,
2947 struct z_candidate
*cand
;
2948 tree explicit_targs
= NULL_TREE
;
2949 int template_only
= 0;
2952 *any_viable_p
= true;
2954 /* Check FN and ARGS. */
2955 gcc_assert (TREE_CODE (fn
) == FUNCTION_DECL
2956 || TREE_CODE (fn
) == TEMPLATE_DECL
2957 || TREE_CODE (fn
) == OVERLOAD
2958 || TREE_CODE (fn
) == TEMPLATE_ID_EXPR
);
2959 gcc_assert (!args
|| TREE_CODE (args
) == TREE_LIST
);
2961 if (TREE_CODE (fn
) == TEMPLATE_ID_EXPR
)
2963 explicit_targs
= TREE_OPERAND (fn
, 1);
2964 fn
= TREE_OPERAND (fn
, 0);
2968 /* Add the various candidate functions. */
2969 add_candidates (fn
, args
, explicit_targs
, template_only
,
2970 /*conversion_path=*/NULL_TREE
,
2971 /*access_path=*/NULL_TREE
,
2975 *candidates
= splice_viable (*candidates
, pedantic
, any_viable_p
);
2979 cand
= tourney (*candidates
);
2983 /* Return an expression for a call to FN (a namespace-scope function,
2984 or a static member function) with the ARGS. */
2987 build_new_function_call (tree fn
, tree args
, bool koenig_p
,
2988 tsubst_flags_t complain
)
2990 struct z_candidate
*candidates
, *cand
;
2995 args
= resolve_args (args
);
2996 if (args
== error_mark_node
)
2997 return error_mark_node
;
2999 /* If this function was found without using argument dependent
3000 lookup, then we want to ignore any undeclared friend
3006 fn
= remove_hidden_names (fn
);
3009 if (complain
& tf_error
)
3010 error ("no matching function for call to %<%D(%A)%>",
3011 DECL_NAME (OVL_CURRENT (orig_fn
)), args
);
3012 return error_mark_node
;
3016 /* Get the high-water mark for the CONVERSION_OBSTACK. */
3017 p
= conversion_obstack_alloc (0);
3019 cand
= perform_overload_resolution (fn
, args
, &candidates
, &any_viable_p
);
3023 if (complain
& tf_error
)
3025 if (!any_viable_p
&& candidates
&& ! candidates
->next
)
3026 return cp_build_function_call (candidates
->fn
, args
, complain
);
3027 if (TREE_CODE (fn
) == TEMPLATE_ID_EXPR
)
3028 fn
= TREE_OPERAND (fn
, 0);
3030 error ("no matching function for call to %<%D(%A)%>",
3031 DECL_NAME (OVL_CURRENT (fn
)), args
);
3033 error ("call of overloaded %<%D(%A)%> is ambiguous",
3034 DECL_NAME (OVL_CURRENT (fn
)), args
);
3036 print_z_candidates (candidates
);
3038 result
= error_mark_node
;
3041 result
= build_over_call (cand
, LOOKUP_NORMAL
, complain
);
3043 /* Free all the conversions we allocated. */
3044 obstack_free (&conversion_obstack
, p
);
3049 /* Build a call to a global operator new. FNNAME is the name of the
3050 operator (either "operator new" or "operator new[]") and ARGS are
3051 the arguments provided. *SIZE points to the total number of bytes
3052 required by the allocation, and is updated if that is changed here.
3053 *COOKIE_SIZE is non-NULL if a cookie should be used. If this
3054 function determines that no cookie should be used, after all,
3055 *COOKIE_SIZE is set to NULL_TREE. If FN is non-NULL, it will be
3056 set, upon return, to the allocation function called. */
3059 build_operator_new_call (tree fnname
, tree args
,
3060 tree
*size
, tree
*cookie_size
,
3064 struct z_candidate
*candidates
;
3065 struct z_candidate
*cand
;
3070 args
= tree_cons (NULL_TREE
, *size
, args
);
3071 args
= resolve_args (args
);
3072 if (args
== error_mark_node
)
3079 If this lookup fails to find the name, or if the allocated type
3080 is not a class type, the allocation function's name is looked
3081 up in the global scope.
3083 we disregard block-scope declarations of "operator new". */
3084 fns
= lookup_function_nonclass (fnname
, args
, /*block_p=*/false);
3086 /* Figure out what function is being called. */
3087 cand
= perform_overload_resolution (fns
, args
, &candidates
, &any_viable_p
);
3089 /* If no suitable function could be found, issue an error message
3094 error ("no matching function for call to %<%D(%A)%>",
3095 DECL_NAME (OVL_CURRENT (fns
)), args
);
3097 error ("call of overloaded %<%D(%A)%> is ambiguous",
3098 DECL_NAME (OVL_CURRENT (fns
)), args
);
3100 print_z_candidates (candidates
);
3101 return error_mark_node
;
3104 /* If a cookie is required, add some extra space. Whether
3105 or not a cookie is required cannot be determined until
3106 after we know which function was called. */
3109 bool use_cookie
= true;
3110 if (!abi_version_at_least (2))
3112 tree placement
= TREE_CHAIN (args
);
3113 /* In G++ 3.2, the check was implemented incorrectly; it
3114 looked at the placement expression, rather than the
3115 type of the function. */
3116 if (placement
&& !TREE_CHAIN (placement
)
3117 && same_type_p (TREE_TYPE (TREE_VALUE (placement
)),
3125 arg_types
= TYPE_ARG_TYPES (TREE_TYPE (cand
->fn
));
3126 /* Skip the size_t parameter. */
3127 arg_types
= TREE_CHAIN (arg_types
);
3128 /* Check the remaining parameters (if any). */
3130 && TREE_CHAIN (arg_types
) == void_list_node
3131 && same_type_p (TREE_VALUE (arg_types
),
3135 /* If we need a cookie, adjust the number of bytes allocated. */
3138 /* Update the total size. */
3139 *size
= size_binop (PLUS_EXPR
, *size
, *cookie_size
);
3140 /* Update the argument list to reflect the adjusted size. */
3141 TREE_VALUE (args
) = *size
;
3144 *cookie_size
= NULL_TREE
;
3147 /* Tell our caller which function we decided to call. */
3151 /* Build the CALL_EXPR. */
3152 return build_over_call (cand
, LOOKUP_NORMAL
, tf_warning_or_error
);
3156 build_object_call (tree obj
, tree args
, tsubst_flags_t complain
)
3158 struct z_candidate
*candidates
= 0, *cand
;
3159 tree fns
, convs
, mem_args
= NULL_TREE
;
3160 tree type
= TREE_TYPE (obj
);
3162 tree result
= NULL_TREE
;
3165 if (TYPE_PTRMEMFUNC_P (type
))
3167 if (complain
& tf_error
)
3168 /* It's no good looking for an overloaded operator() on a
3169 pointer-to-member-function. */
3170 error ("pointer-to-member function %E cannot be called without an object; consider using .* or ->*", obj
);
3171 return error_mark_node
;
3174 if (TYPE_BINFO (type
))
3176 fns
= lookup_fnfields (TYPE_BINFO (type
), ansi_opname (CALL_EXPR
), 1);
3177 if (fns
== error_mark_node
)
3178 return error_mark_node
;
3183 args
= resolve_args (args
);
3185 if (args
== error_mark_node
)
3186 return error_mark_node
;
3188 /* Get the high-water mark for the CONVERSION_OBSTACK. */
3189 p
= conversion_obstack_alloc (0);
3193 tree base
= BINFO_TYPE (BASELINK_BINFO (fns
));
3194 mem_args
= tree_cons (NULL_TREE
, build_this (obj
), args
);
3196 for (fns
= BASELINK_FUNCTIONS (fns
); fns
; fns
= OVL_NEXT (fns
))
3198 tree fn
= OVL_CURRENT (fns
);
3199 if (TREE_CODE (fn
) == TEMPLATE_DECL
)
3200 add_template_candidate (&candidates
, fn
, base
, NULL_TREE
,
3201 mem_args
, NULL_TREE
,
3204 LOOKUP_NORMAL
, DEDUCE_CALL
);
3206 add_function_candidate
3207 (&candidates
, fn
, base
, mem_args
, TYPE_BINFO (type
),
3208 TYPE_BINFO (type
), LOOKUP_NORMAL
);
3212 convs
= lookup_conversions (type
);
3214 for (; convs
; convs
= TREE_CHAIN (convs
))
3216 tree fns
= TREE_VALUE (convs
);
3217 tree totype
= TREE_TYPE (TREE_TYPE (OVL_CURRENT (fns
)));
3219 if ((TREE_CODE (totype
) == POINTER_TYPE
3220 && TREE_CODE (TREE_TYPE (totype
)) == FUNCTION_TYPE
)
3221 || (TREE_CODE (totype
) == REFERENCE_TYPE
3222 && TREE_CODE (TREE_TYPE (totype
)) == FUNCTION_TYPE
)
3223 || (TREE_CODE (totype
) == REFERENCE_TYPE
3224 && TREE_CODE (TREE_TYPE (totype
)) == POINTER_TYPE
3225 && TREE_CODE (TREE_TYPE (TREE_TYPE (totype
))) == FUNCTION_TYPE
))
3226 for (; fns
; fns
= OVL_NEXT (fns
))
3228 tree fn
= OVL_CURRENT (fns
);
3229 if (TREE_CODE (fn
) == TEMPLATE_DECL
)
3230 add_template_conv_candidate
3231 (&candidates
, fn
, obj
, args
, totype
,
3232 /*access_path=*/NULL_TREE
,
3233 /*conversion_path=*/NULL_TREE
);
3235 add_conv_candidate (&candidates
, fn
, obj
, args
,
3236 /*conversion_path=*/NULL_TREE
,
3237 /*access_path=*/NULL_TREE
);
3241 candidates
= splice_viable (candidates
, pedantic
, &any_viable_p
);
3244 if (complain
& tf_error
)
3246 error ("no match for call to %<(%T) (%A)%>", TREE_TYPE (obj
), args
);
3247 print_z_candidates (candidates
);
3249 result
= error_mark_node
;
3253 cand
= tourney (candidates
);
3256 if (complain
& tf_error
)
3258 error ("call of %<(%T) (%A)%> is ambiguous",
3259 TREE_TYPE (obj
), args
);
3260 print_z_candidates (candidates
);
3262 result
= error_mark_node
;
3264 /* Since cand->fn will be a type, not a function, for a conversion
3265 function, we must be careful not to unconditionally look at
3267 else if (TREE_CODE (cand
->fn
) == FUNCTION_DECL
3268 && DECL_OVERLOADED_OPERATOR_P (cand
->fn
) == CALL_EXPR
)
3269 result
= build_over_call (cand
, LOOKUP_NORMAL
, complain
);
3272 obj
= convert_like_with_context (cand
->convs
[0], obj
, cand
->fn
, -1,
3274 obj
= convert_from_reference (obj
);
3275 result
= cp_build_function_call (obj
, args
, complain
);
3279 /* Free all the conversions we allocated. */
3280 obstack_free (&conversion_obstack
, p
);
3286 op_error (enum tree_code code
, enum tree_code code2
,
3287 tree arg1
, tree arg2
, tree arg3
, const char *problem
)
3291 if (code
== MODIFY_EXPR
)
3292 opname
= assignment_operator_name_info
[code2
].name
;
3294 opname
= operator_name_info
[code
].name
;
3299 error ("%s for ternary %<operator?:%> in %<%E ? %E : %E%>",
3300 problem
, arg1
, arg2
, arg3
);
3303 case POSTINCREMENT_EXPR
:
3304 case POSTDECREMENT_EXPR
:
3305 error ("%s for %<operator%s%> in %<%E%s%>", problem
, opname
, arg1
, opname
);
3309 error ("%s for %<operator[]%> in %<%E[%E]%>", problem
, arg1
, arg2
);
3314 error ("%s for %qs in %<%s %E%>", problem
, opname
, opname
, arg1
);
3319 error ("%s for %<operator%s%> in %<%E %s %E%>",
3320 problem
, opname
, arg1
, opname
, arg2
);
3322 error ("%s for %<operator%s%> in %<%s%E%>",
3323 problem
, opname
, opname
, arg1
);
3328 /* Return the implicit conversion sequence that could be used to
3329 convert E1 to E2 in [expr.cond]. */
3332 conditional_conversion (tree e1
, tree e2
)
3334 tree t1
= non_reference (TREE_TYPE (e1
));
3335 tree t2
= non_reference (TREE_TYPE (e2
));
3341 If E2 is an lvalue: E1 can be converted to match E2 if E1 can be
3342 implicitly converted (clause _conv_) to the type "reference to
3343 T2", subject to the constraint that in the conversion the
3344 reference must bind directly (_dcl.init.ref_) to E1. */
3345 if (real_lvalue_p (e2
))
3347 conv
= implicit_conversion (build_reference_type (t2
),
3351 LOOKUP_NO_TEMP_BIND
);
3358 If E1 and E2 have class type, and the underlying class types are
3359 the same or one is a base class of the other: E1 can be converted
3360 to match E2 if the class of T2 is the same type as, or a base
3361 class of, the class of T1, and the cv-qualification of T2 is the
3362 same cv-qualification as, or a greater cv-qualification than, the
3363 cv-qualification of T1. If the conversion is applied, E1 is
3364 changed to an rvalue of type T2 that still refers to the original
3365 source class object (or the appropriate subobject thereof). */
3366 if (CLASS_TYPE_P (t1
) && CLASS_TYPE_P (t2
)
3367 && ((good_base
= DERIVED_FROM_P (t2
, t1
)) || DERIVED_FROM_P (t1
, t2
)))
3369 if (good_base
&& at_least_as_qualified_p (t2
, t1
))
3371 conv
= build_identity_conv (t1
, e1
);
3372 if (!same_type_p (TYPE_MAIN_VARIANT (t1
),
3373 TYPE_MAIN_VARIANT (t2
)))
3374 conv
= build_conv (ck_base
, t2
, conv
);
3376 conv
= build_conv (ck_rvalue
, t2
, conv
);
3385 Otherwise: E1 can be converted to match E2 if E1 can be implicitly
3386 converted to the type that expression E2 would have if E2 were
3387 converted to an rvalue (or the type it has, if E2 is an rvalue). */
3388 return implicit_conversion (t2
, t1
, e1
, /*c_cast_p=*/false,
3392 /* Implement [expr.cond]. ARG1, ARG2, and ARG3 are the three
3393 arguments to the conditional expression. */
3396 build_conditional_expr (tree arg1
, tree arg2
, tree arg3
,
3397 tsubst_flags_t complain
)
3401 tree result
= NULL_TREE
;
3402 tree result_type
= NULL_TREE
;
3403 bool lvalue_p
= true;
3404 struct z_candidate
*candidates
= 0;
3405 struct z_candidate
*cand
;
3408 /* As a G++ extension, the second argument to the conditional can be
3409 omitted. (So that `a ? : c' is roughly equivalent to `a ? a :
3410 c'.) If the second operand is omitted, make sure it is
3411 calculated only once. */
3414 if (complain
& tf_error
)
3415 pedwarn (input_location
, OPT_pedantic
,
3416 "ISO C++ forbids omitting the middle term of a ?: expression");
3418 /* Make sure that lvalues remain lvalues. See g++.oliva/ext1.C. */
3419 if (real_lvalue_p (arg1
))
3420 arg2
= arg1
= stabilize_reference (arg1
);
3422 arg2
= arg1
= save_expr (arg1
);
3427 The first expression is implicitly converted to bool (clause
3429 arg1
= perform_implicit_conversion (boolean_type_node
, arg1
, complain
);
3431 /* If something has already gone wrong, just pass that fact up the
3433 if (error_operand_p (arg1
)
3434 || error_operand_p (arg2
)
3435 || error_operand_p (arg3
))
3436 return error_mark_node
;
3440 If either the second or the third operand has type (possibly
3441 cv-qualified) void, then the lvalue-to-rvalue (_conv.lval_),
3442 array-to-pointer (_conv.array_), and function-to-pointer
3443 (_conv.func_) standard conversions are performed on the second
3444 and third operands. */
3445 arg2_type
= unlowered_expr_type (arg2
);
3446 arg3_type
= unlowered_expr_type (arg3
);
3447 if (VOID_TYPE_P (arg2_type
) || VOID_TYPE_P (arg3_type
))
3449 /* Do the conversions. We don't these for `void' type arguments
3450 since it can't have any effect and since decay_conversion
3451 does not handle that case gracefully. */
3452 if (!VOID_TYPE_P (arg2_type
))
3453 arg2
= decay_conversion (arg2
);
3454 if (!VOID_TYPE_P (arg3_type
))
3455 arg3
= decay_conversion (arg3
);
3456 arg2_type
= TREE_TYPE (arg2
);
3457 arg3_type
= TREE_TYPE (arg3
);
3461 One of the following shall hold:
3463 --The second or the third operand (but not both) is a
3464 throw-expression (_except.throw_); the result is of the
3465 type of the other and is an rvalue.
3467 --Both the second and the third operands have type void; the
3468 result is of type void and is an rvalue.
3470 We must avoid calling force_rvalue for expressions of type
3471 "void" because it will complain that their value is being
3473 if (TREE_CODE (arg2
) == THROW_EXPR
3474 && TREE_CODE (arg3
) != THROW_EXPR
)
3476 if (!VOID_TYPE_P (arg3_type
))
3477 arg3
= force_rvalue (arg3
);
3478 arg3_type
= TREE_TYPE (arg3
);
3479 result_type
= arg3_type
;
3481 else if (TREE_CODE (arg2
) != THROW_EXPR
3482 && TREE_CODE (arg3
) == THROW_EXPR
)
3484 if (!VOID_TYPE_P (arg2_type
))
3485 arg2
= force_rvalue (arg2
);
3486 arg2_type
= TREE_TYPE (arg2
);
3487 result_type
= arg2_type
;
3489 else if (VOID_TYPE_P (arg2_type
) && VOID_TYPE_P (arg3_type
))
3490 result_type
= void_type_node
;
3493 if (complain
& tf_error
)
3495 if (VOID_TYPE_P (arg2_type
))
3496 error ("second operand to the conditional operator "
3497 "is of type %<void%>, "
3498 "but the third operand is neither a throw-expression "
3499 "nor of type %<void%>");
3501 error ("third operand to the conditional operator "
3502 "is of type %<void%>, "
3503 "but the second operand is neither a throw-expression "
3504 "nor of type %<void%>");
3506 return error_mark_node
;
3510 goto valid_operands
;
3514 Otherwise, if the second and third operand have different types,
3515 and either has (possibly cv-qualified) class type, an attempt is
3516 made to convert each of those operands to the type of the other. */
3517 else if (!same_type_p (arg2_type
, arg3_type
)
3518 && (CLASS_TYPE_P (arg2_type
) || CLASS_TYPE_P (arg3_type
)))
3523 /* Get the high-water mark for the CONVERSION_OBSTACK. */
3524 p
= conversion_obstack_alloc (0);
3526 conv2
= conditional_conversion (arg2
, arg3
);
3527 conv3
= conditional_conversion (arg3
, arg2
);
3531 If both can be converted, or one can be converted but the
3532 conversion is ambiguous, the program is ill-formed. If
3533 neither can be converted, the operands are left unchanged and
3534 further checking is performed as described below. If exactly
3535 one conversion is possible, that conversion is applied to the
3536 chosen operand and the converted operand is used in place of
3537 the original operand for the remainder of this section. */
3538 if ((conv2
&& !conv2
->bad_p
3539 && conv3
&& !conv3
->bad_p
)
3540 || (conv2
&& conv2
->kind
== ck_ambig
)
3541 || (conv3
&& conv3
->kind
== ck_ambig
))
3543 error ("operands to ?: have different types %qT and %qT",
3544 arg2_type
, arg3_type
);
3545 result
= error_mark_node
;
3547 else if (conv2
&& (!conv2
->bad_p
|| !conv3
))
3549 arg2
= convert_like (conv2
, arg2
, complain
);
3550 arg2
= convert_from_reference (arg2
);
3551 arg2_type
= TREE_TYPE (arg2
);
3552 /* Even if CONV2 is a valid conversion, the result of the
3553 conversion may be invalid. For example, if ARG3 has type
3554 "volatile X", and X does not have a copy constructor
3555 accepting a "volatile X&", then even if ARG2 can be
3556 converted to X, the conversion will fail. */
3557 if (error_operand_p (arg2
))
3558 result
= error_mark_node
;
3560 else if (conv3
&& (!conv3
->bad_p
|| !conv2
))
3562 arg3
= convert_like (conv3
, arg3
, complain
);
3563 arg3
= convert_from_reference (arg3
);
3564 arg3_type
= TREE_TYPE (arg3
);
3565 if (error_operand_p (arg3
))
3566 result
= error_mark_node
;
3569 /* Free all the conversions we allocated. */
3570 obstack_free (&conversion_obstack
, p
);
3575 /* If, after the conversion, both operands have class type,
3576 treat the cv-qualification of both operands as if it were the
3577 union of the cv-qualification of the operands.
3579 The standard is not clear about what to do in this
3580 circumstance. For example, if the first operand has type
3581 "const X" and the second operand has a user-defined
3582 conversion to "volatile X", what is the type of the second
3583 operand after this step? Making it be "const X" (matching
3584 the first operand) seems wrong, as that discards the
3585 qualification without actually performing a copy. Leaving it
3586 as "volatile X" seems wrong as that will result in the
3587 conditional expression failing altogether, even though,
3588 according to this step, the one operand could be converted to
3589 the type of the other. */
3590 if ((conv2
|| conv3
)
3591 && CLASS_TYPE_P (arg2_type
)
3592 && TYPE_QUALS (arg2_type
) != TYPE_QUALS (arg3_type
))
3593 arg2_type
= arg3_type
=
3594 cp_build_qualified_type (arg2_type
,
3595 TYPE_QUALS (arg2_type
)
3596 | TYPE_QUALS (arg3_type
));
3601 If the second and third operands are lvalues and have the same
3602 type, the result is of that type and is an lvalue. */
3603 if (real_lvalue_p (arg2
)
3604 && real_lvalue_p (arg3
)
3605 && same_type_p (arg2_type
, arg3_type
))
3607 result_type
= arg2_type
;
3608 goto valid_operands
;
3613 Otherwise, the result is an rvalue. If the second and third
3614 operand do not have the same type, and either has (possibly
3615 cv-qualified) class type, overload resolution is used to
3616 determine the conversions (if any) to be applied to the operands
3617 (_over.match.oper_, _over.built_). */
3619 if (!same_type_p (arg2_type
, arg3_type
)
3620 && (CLASS_TYPE_P (arg2_type
) || CLASS_TYPE_P (arg3_type
)))
3626 /* Rearrange the arguments so that add_builtin_candidate only has
3627 to know about two args. In build_builtin_candidates, the
3628 arguments are unscrambled. */
3632 add_builtin_candidates (&candidates
,
3635 ansi_opname (COND_EXPR
),
3641 If the overload resolution fails, the program is
3643 candidates
= splice_viable (candidates
, pedantic
, &any_viable_p
);
3646 if (complain
& tf_error
)
3648 op_error (COND_EXPR
, NOP_EXPR
, arg1
, arg2
, arg3
, "no match");
3649 print_z_candidates (candidates
);
3651 return error_mark_node
;
3653 cand
= tourney (candidates
);
3656 if (complain
& tf_error
)
3658 op_error (COND_EXPR
, NOP_EXPR
, arg1
, arg2
, arg3
, "no match");
3659 print_z_candidates (candidates
);
3661 return error_mark_node
;
3666 Otherwise, the conversions thus determined are applied, and
3667 the converted operands are used in place of the original
3668 operands for the remainder of this section. */
3669 conv
= cand
->convs
[0];
3670 arg1
= convert_like (conv
, arg1
, complain
);
3671 conv
= cand
->convs
[1];
3672 arg2
= convert_like (conv
, arg2
, complain
);
3673 conv
= cand
->convs
[2];
3674 arg3
= convert_like (conv
, arg3
, complain
);
3679 Lvalue-to-rvalue (_conv.lval_), array-to-pointer (_conv.array_),
3680 and function-to-pointer (_conv.func_) standard conversions are
3681 performed on the second and third operands.
3683 We need to force the lvalue-to-rvalue conversion here for class types,
3684 so we get TARGET_EXPRs; trying to deal with a COND_EXPR of class rvalues
3685 that isn't wrapped with a TARGET_EXPR plays havoc with exception
3688 arg2
= force_rvalue (arg2
);
3689 if (!CLASS_TYPE_P (arg2_type
))
3690 arg2_type
= TREE_TYPE (arg2
);
3692 arg3
= force_rvalue (arg3
);
3693 if (!CLASS_TYPE_P (arg2_type
))
3694 arg3_type
= TREE_TYPE (arg3
);
3696 if (arg2
== error_mark_node
|| arg3
== error_mark_node
)
3697 return error_mark_node
;
3701 After those conversions, one of the following shall hold:
3703 --The second and third operands have the same type; the result is of
3705 if (same_type_p (arg2_type
, arg3_type
))
3706 result_type
= arg2_type
;
3709 --The second and third operands have arithmetic or enumeration
3710 type; the usual arithmetic conversions are performed to bring
3711 them to a common type, and the result is of that type. */
3712 else if ((ARITHMETIC_TYPE_P (arg2_type
)
3713 || UNSCOPED_ENUM_P (arg2_type
))
3714 && (ARITHMETIC_TYPE_P (arg3_type
)
3715 || UNSCOPED_ENUM_P (arg3_type
)))
3717 /* In this case, there is always a common type. */
3718 result_type
= type_after_usual_arithmetic_conversions (arg2_type
,
3721 if (TREE_CODE (arg2_type
) == ENUMERAL_TYPE
3722 && TREE_CODE (arg3_type
) == ENUMERAL_TYPE
)
3724 if (complain
& tf_warning
)
3726 "enumeral mismatch in conditional expression: %qT vs %qT",
3727 arg2_type
, arg3_type
);
3729 else if (extra_warnings
3730 && ((TREE_CODE (arg2_type
) == ENUMERAL_TYPE
3731 && !same_type_p (arg3_type
, type_promotes_to (arg2_type
)))
3732 || (TREE_CODE (arg3_type
) == ENUMERAL_TYPE
3733 && !same_type_p (arg2_type
, type_promotes_to (arg3_type
)))))
3735 if (complain
& tf_warning
)
3737 "enumeral and non-enumeral type in conditional expression");
3740 arg2
= perform_implicit_conversion (result_type
, arg2
, complain
);
3741 arg3
= perform_implicit_conversion (result_type
, arg3
, complain
);
3745 --The second and third operands have pointer type, or one has
3746 pointer type and the other is a null pointer constant; pointer
3747 conversions (_conv.ptr_) and qualification conversions
3748 (_conv.qual_) are performed to bring them to their composite
3749 pointer type (_expr.rel_). The result is of the composite
3752 --The second and third operands have pointer to member type, or
3753 one has pointer to member type and the other is a null pointer
3754 constant; pointer to member conversions (_conv.mem_) and
3755 qualification conversions (_conv.qual_) are performed to bring
3756 them to a common type, whose cv-qualification shall match the
3757 cv-qualification of either the second or the third operand.
3758 The result is of the common type. */
3759 else if ((null_ptr_cst_p (arg2
)
3760 && (TYPE_PTR_P (arg3_type
) || TYPE_PTR_TO_MEMBER_P (arg3_type
)))
3761 || (null_ptr_cst_p (arg3
)
3762 && (TYPE_PTR_P (arg2_type
) || TYPE_PTR_TO_MEMBER_P (arg2_type
)))
3763 || (TYPE_PTR_P (arg2_type
) && TYPE_PTR_P (arg3_type
))
3764 || (TYPE_PTRMEM_P (arg2_type
) && TYPE_PTRMEM_P (arg3_type
))
3765 || (TYPE_PTRMEMFUNC_P (arg2_type
) && TYPE_PTRMEMFUNC_P (arg3_type
)))
3767 result_type
= composite_pointer_type (arg2_type
, arg3_type
, arg2
,
3768 arg3
, "conditional expression",
3770 if (result_type
== error_mark_node
)
3771 return error_mark_node
;
3772 arg2
= perform_implicit_conversion (result_type
, arg2
, complain
);
3773 arg3
= perform_implicit_conversion (result_type
, arg3
, complain
);
3778 if (complain
& tf_error
)
3779 error ("operands to ?: have different types %qT and %qT",
3780 arg2_type
, arg3_type
);
3781 return error_mark_node
;
3785 result
= fold_if_not_in_template (build3 (COND_EXPR
, result_type
, arg1
,
3787 /* We can't use result_type below, as fold might have returned a
3792 /* Expand both sides into the same slot, hopefully the target of
3793 the ?: expression. We used to check for TARGET_EXPRs here,
3794 but now we sometimes wrap them in NOP_EXPRs so the test would
3796 if (CLASS_TYPE_P (TREE_TYPE (result
)))
3797 result
= get_target_expr (result
);
3798 /* If this expression is an rvalue, but might be mistaken for an
3799 lvalue, we must add a NON_LVALUE_EXPR. */
3800 result
= rvalue (result
);
3806 /* OPERAND is an operand to an expression. Perform necessary steps
3807 required before using it. If OPERAND is NULL_TREE, NULL_TREE is
3811 prep_operand (tree operand
)
3815 if (CLASS_TYPE_P (TREE_TYPE (operand
))
3816 && CLASSTYPE_TEMPLATE_INSTANTIATION (TREE_TYPE (operand
)))
3817 /* Make sure the template type is instantiated now. */
3818 instantiate_class_template (TYPE_MAIN_VARIANT (TREE_TYPE (operand
)));
3824 /* Add each of the viable functions in FNS (a FUNCTION_DECL or
3825 OVERLOAD) to the CANDIDATES, returning an updated list of
3826 CANDIDATES. The ARGS are the arguments provided to the call,
3827 without any implicit object parameter. The EXPLICIT_TARGS are
3828 explicit template arguments provided. TEMPLATE_ONLY is true if
3829 only template functions should be considered. CONVERSION_PATH,
3830 ACCESS_PATH, and FLAGS are as for add_function_candidate. */
3833 add_candidates (tree fns
, tree args
,
3834 tree explicit_targs
, bool template_only
,
3835 tree conversion_path
, tree access_path
,
3837 struct z_candidate
**candidates
)
3840 tree non_static_args
;
3842 ctype
= conversion_path
? BINFO_TYPE (conversion_path
) : NULL_TREE
;
3843 /* Delay creating the implicit this parameter until it is needed. */
3844 non_static_args
= NULL_TREE
;
3851 fn
= OVL_CURRENT (fns
);
3852 /* Figure out which set of arguments to use. */
3853 if (DECL_NONSTATIC_MEMBER_FUNCTION_P (fn
))
3855 /* If this function is a non-static member, prepend the implicit
3856 object parameter. */
3857 if (!non_static_args
)
3858 non_static_args
= tree_cons (NULL_TREE
,
3859 build_this (TREE_VALUE (args
)),
3861 fn_args
= non_static_args
;
3864 /* Otherwise, just use the list of arguments provided. */
3867 if (TREE_CODE (fn
) == TEMPLATE_DECL
)
3868 add_template_candidate (candidates
,
3878 else if (!template_only
)
3879 add_function_candidate (candidates
,
3886 fns
= OVL_NEXT (fns
);
3891 build_new_op (enum tree_code code
, int flags
, tree arg1
, tree arg2
, tree arg3
,
3892 bool *overloaded_p
, tsubst_flags_t complain
)
3894 struct z_candidate
*candidates
= 0, *cand
;
3895 tree arglist
, fnname
;
3897 tree result
= NULL_TREE
;
3898 bool result_valid_p
= false;
3899 enum tree_code code2
= NOP_EXPR
;
3904 bool expl_eq_arg1
= false;
3906 if (error_operand_p (arg1
)
3907 || error_operand_p (arg2
)
3908 || error_operand_p (arg3
))
3909 return error_mark_node
;
3911 if (code
== MODIFY_EXPR
)
3913 code2
= TREE_CODE (arg3
);
3915 fnname
= ansi_assopname (code2
);
3918 fnname
= ansi_opname (code
);
3920 arg1
= prep_operand (arg1
);
3926 case VEC_DELETE_EXPR
:
3928 /* Use build_op_new_call and build_op_delete_call instead. */
3932 return build_object_call (arg1
, arg2
, complain
);
3934 case TRUTH_ORIF_EXPR
:
3935 case TRUTH_ANDIF_EXPR
:
3936 case TRUTH_AND_EXPR
:
3938 if (COMPARISON_CLASS_P (arg1
))
3939 expl_eq_arg1
= true;
3944 arg2
= prep_operand (arg2
);
3945 arg3
= prep_operand (arg3
);
3947 if (code
== COND_EXPR
)
3949 if (arg2
== NULL_TREE
3950 || TREE_CODE (TREE_TYPE (arg2
)) == VOID_TYPE
3951 || TREE_CODE (TREE_TYPE (arg3
)) == VOID_TYPE
3952 || (! IS_OVERLOAD_TYPE (TREE_TYPE (arg2
))
3953 && ! IS_OVERLOAD_TYPE (TREE_TYPE (arg3
))))
3956 else if (! IS_OVERLOAD_TYPE (TREE_TYPE (arg1
))
3957 && (! arg2
|| ! IS_OVERLOAD_TYPE (TREE_TYPE (arg2
))))
3960 if (code
== POSTINCREMENT_EXPR
|| code
== POSTDECREMENT_EXPR
)
3961 arg2
= integer_zero_node
;
3963 arglist
= NULL_TREE
;
3965 arglist
= tree_cons (NULL_TREE
, arg3
, arglist
);
3967 arglist
= tree_cons (NULL_TREE
, arg2
, arglist
);
3968 arglist
= tree_cons (NULL_TREE
, arg1
, arglist
);
3970 /* Get the high-water mark for the CONVERSION_OBSTACK. */
3971 p
= conversion_obstack_alloc (0);
3973 /* Add namespace-scope operators to the list of functions to
3975 add_candidates (lookup_function_nonclass (fnname
, arglist
, /*block_p=*/true),
3976 arglist
, NULL_TREE
, false, NULL_TREE
, NULL_TREE
,
3977 flags
, &candidates
);
3978 /* Add class-member operators to the candidate set. */
3979 if (CLASS_TYPE_P (TREE_TYPE (arg1
)))
3983 fns
= lookup_fnfields (TREE_TYPE (arg1
), fnname
, 1);
3984 if (fns
== error_mark_node
)
3986 result
= error_mark_node
;
3987 goto user_defined_result_ready
;
3990 add_candidates (BASELINK_FUNCTIONS (fns
), arglist
,
3992 BASELINK_BINFO (fns
),
3993 TYPE_BINFO (TREE_TYPE (arg1
)),
3994 flags
, &candidates
);
3997 /* Rearrange the arguments for ?: so that add_builtin_candidate only has
3998 to know about two args; a builtin candidate will always have a first
3999 parameter of type bool. We'll handle that in
4000 build_builtin_candidate. */
4001 if (code
== COND_EXPR
)
4011 args
[2] = NULL_TREE
;
4014 add_builtin_candidates (&candidates
, code
, code2
, fnname
, args
, flags
);
4020 /* For these, the built-in candidates set is empty
4021 [over.match.oper]/3. We don't want non-strict matches
4022 because exact matches are always possible with built-in
4023 operators. The built-in candidate set for COMPONENT_REF
4024 would be empty too, but since there are no such built-in
4025 operators, we accept non-strict matches for them. */
4030 strict_p
= pedantic
;
4034 candidates
= splice_viable (candidates
, strict_p
, &any_viable_p
);
4039 case POSTINCREMENT_EXPR
:
4040 case POSTDECREMENT_EXPR
:
4041 /* Don't try anything fancy if we're not allowed to produce
4043 if (!(complain
& tf_error
))
4044 return error_mark_node
;
4046 /* Look for an `operator++ (int)'. If they didn't have
4047 one, then we fall back to the old way of doing things. */
4048 if (flags
& LOOKUP_COMPLAIN
)
4049 permerror (input_location
, "no %<%D(int)%> declared for postfix %qs, "
4050 "trying prefix operator instead",
4052 operator_name_info
[code
].name
);
4053 if (code
== POSTINCREMENT_EXPR
)
4054 code
= PREINCREMENT_EXPR
;
4056 code
= PREDECREMENT_EXPR
;
4057 result
= build_new_op (code
, flags
, arg1
, NULL_TREE
, NULL_TREE
,
4058 overloaded_p
, complain
);
4061 /* The caller will deal with these. */
4066 result_valid_p
= true;
4070 if ((flags
& LOOKUP_COMPLAIN
) && (complain
& tf_error
))
4072 op_error (code
, code2
, arg1
, arg2
, arg3
, "no match");
4073 print_z_candidates (candidates
);
4075 result
= error_mark_node
;
4081 cand
= tourney (candidates
);
4084 if ((flags
& LOOKUP_COMPLAIN
) && (complain
& tf_error
))
4086 op_error (code
, code2
, arg1
, arg2
, arg3
, "ambiguous overload");
4087 print_z_candidates (candidates
);
4089 result
= error_mark_node
;
4091 else if (TREE_CODE (cand
->fn
) == FUNCTION_DECL
)
4094 *overloaded_p
= true;
4096 if (resolve_args (arglist
) == error_mark_node
)
4097 result
= error_mark_node
;
4099 result
= build_over_call (cand
, LOOKUP_NORMAL
, complain
);
4103 /* Give any warnings we noticed during overload resolution. */
4104 if (cand
->warnings
&& (complain
& tf_warning
))
4106 struct candidate_warning
*w
;
4107 for (w
= cand
->warnings
; w
; w
= w
->next
)
4108 joust (cand
, w
->loser
, 1);
4111 /* Check for comparison of different enum types. */
4120 if (TREE_CODE (TREE_TYPE (arg1
)) == ENUMERAL_TYPE
4121 && TREE_CODE (TREE_TYPE (arg2
)) == ENUMERAL_TYPE
4122 && (TYPE_MAIN_VARIANT (TREE_TYPE (arg1
))
4123 != TYPE_MAIN_VARIANT (TREE_TYPE (arg2
)))
4124 && (complain
& tf_warning
))
4126 warning (OPT_Wenum_compare
,
4127 "comparison between %q#T and %q#T",
4128 TREE_TYPE (arg1
), TREE_TYPE (arg2
));
4135 /* We need to strip any leading REF_BIND so that bitfields
4136 don't cause errors. This should not remove any important
4137 conversions, because builtins don't apply to class
4138 objects directly. */
4139 conv
= cand
->convs
[0];
4140 if (conv
->kind
== ck_ref_bind
)
4141 conv
= conv
->u
.next
;
4142 arg1
= convert_like (conv
, arg1
, complain
);
4145 conv
= cand
->convs
[1];
4146 if (conv
->kind
== ck_ref_bind
)
4147 conv
= conv
->u
.next
;
4148 arg2
= convert_like (conv
, arg2
, complain
);
4152 conv
= cand
->convs
[2];
4153 if (conv
->kind
== ck_ref_bind
)
4154 conv
= conv
->u
.next
;
4155 arg3
= convert_like (conv
, arg3
, complain
);
4160 if (complain
& tf_warning
)
4161 warn_logical_operator (code
, arg1
, arg2
);
4162 expl_eq_arg1
= true;
4167 user_defined_result_ready
:
4169 /* Free all the conversions we allocated. */
4170 obstack_free (&conversion_obstack
, p
);
4172 if (result
|| result_valid_p
)
4179 return cp_build_modify_expr (arg1
, code2
, arg2
, complain
);
4182 return cp_build_indirect_ref (arg1
, "unary *", complain
);
4184 case TRUTH_ANDIF_EXPR
:
4185 case TRUTH_ORIF_EXPR
:
4186 case TRUTH_AND_EXPR
:
4189 warn_logical_operator (code
, arg1
, arg2
);
4193 case TRUNC_DIV_EXPR
:
4204 case TRUNC_MOD_EXPR
:
4208 return cp_build_binary_op (input_location
, code
, arg1
, arg2
, complain
);
4210 case UNARY_PLUS_EXPR
:
4213 case TRUTH_NOT_EXPR
:
4214 case PREINCREMENT_EXPR
:
4215 case POSTINCREMENT_EXPR
:
4216 case PREDECREMENT_EXPR
:
4217 case POSTDECREMENT_EXPR
:
4220 return cp_build_unary_op (code
, arg1
, candidates
!= 0, complain
);
4223 return build_array_ref (arg1
, arg2
, input_location
);
4226 return build_conditional_expr (arg1
, arg2
, arg3
, complain
);
4229 return build_m_component_ref (cp_build_indirect_ref (arg1
, NULL
,
4233 /* The caller will deal with these. */
4245 /* Build a call to operator delete. This has to be handled very specially,
4246 because the restrictions on what signatures match are different from all
4247 other call instances. For a normal delete, only a delete taking (void *)
4248 or (void *, size_t) is accepted. For a placement delete, only an exact
4249 match with the placement new is accepted.
4251 CODE is either DELETE_EXPR or VEC_DELETE_EXPR.
4252 ADDR is the pointer to be deleted.
4253 SIZE is the size of the memory block to be deleted.
4254 GLOBAL_P is true if the delete-expression should not consider
4255 class-specific delete operators.
4256 PLACEMENT is the corresponding placement new call, or NULL_TREE.
4258 If this call to "operator delete" is being generated as part to
4259 deallocate memory allocated via a new-expression (as per [expr.new]
4260 which requires that if the initialization throws an exception then
4261 we call a deallocation function), then ALLOC_FN is the allocation
4265 build_op_delete_call (enum tree_code code
, tree addr
, tree size
,
4266 bool global_p
, tree placement
,
4269 tree fn
= NULL_TREE
;
4270 tree fns
, fnname
, argtypes
, type
;
4273 if (addr
== error_mark_node
)
4274 return error_mark_node
;
4276 type
= strip_array_types (TREE_TYPE (TREE_TYPE (addr
)));
4278 fnname
= ansi_opname (code
);
4280 if (CLASS_TYPE_P (type
)
4281 && COMPLETE_TYPE_P (complete_type (type
))
4285 If the result of the lookup is ambiguous or inaccessible, or if
4286 the lookup selects a placement deallocation function, the
4287 program is ill-formed.
4289 Therefore, we ask lookup_fnfields to complain about ambiguity. */
4291 fns
= lookup_fnfields (TYPE_BINFO (type
), fnname
, 1);
4292 if (fns
== error_mark_node
)
4293 return error_mark_node
;
4298 if (fns
== NULL_TREE
)
4299 fns
= lookup_name_nonclass (fnname
);
4301 /* Strip const and volatile from addr. */
4302 addr
= cp_convert (ptr_type_node
, addr
);
4306 /* Get the parameter types for the allocation function that is
4308 gcc_assert (alloc_fn
!= NULL_TREE
);
4309 argtypes
= TREE_CHAIN (TYPE_ARG_TYPES (TREE_TYPE (alloc_fn
)));
4313 /* First try it without the size argument. */
4314 argtypes
= void_list_node
;
4317 /* We make two tries at finding a matching `operator delete'. On
4318 the first pass, we look for a one-operator (or placement)
4319 operator delete. If we're not doing placement delete, then on
4320 the second pass we look for a two-argument delete. */
4321 for (pass
= 0; pass
< (placement
? 1 : 2); ++pass
)
4323 /* Go through the `operator delete' functions looking for one
4324 with a matching type. */
4325 for (fn
= BASELINK_P (fns
) ? BASELINK_FUNCTIONS (fns
) : fns
;
4331 /* The first argument must be "void *". */
4332 t
= TYPE_ARG_TYPES (TREE_TYPE (OVL_CURRENT (fn
)));
4333 if (!same_type_p (TREE_VALUE (t
), ptr_type_node
))
4336 /* On the first pass, check the rest of the arguments. */
4342 if (!same_type_p (TREE_VALUE (a
), TREE_VALUE (t
)))
4350 /* On the second pass, look for a function with exactly two
4351 arguments: "void *" and "size_t". */
4353 /* For "operator delete(void *, ...)" there will be
4354 no second argument, but we will not get an exact
4357 && same_type_p (TREE_VALUE (t
), size_type_node
)
4358 && TREE_CHAIN (t
) == void_list_node
)
4362 /* If we found a match, we're done. */
4367 /* If we have a matching function, call it. */
4370 /* Make sure we have the actual function, and not an
4372 fn
= OVL_CURRENT (fn
);
4374 /* If the FN is a member function, make sure that it is
4376 if (DECL_CLASS_SCOPE_P (fn
))
4377 perform_or_defer_access_check (TYPE_BINFO (type
), fn
, fn
);
4381 /* The placement args might not be suitable for overload
4382 resolution at this point, so build the call directly. */
4383 int nargs
= call_expr_nargs (placement
);
4384 tree
*argarray
= (tree
*) alloca (nargs
* sizeof (tree
));
4387 for (i
= 1; i
< nargs
; i
++)
4388 argarray
[i
] = CALL_EXPR_ARG (placement
, i
);
4390 return build_cxx_call (fn
, nargs
, argarray
);
4396 args
= tree_cons (NULL_TREE
, addr
, NULL_TREE
);
4398 args
= tree_cons (NULL_TREE
, addr
,
4399 build_tree_list (NULL_TREE
, size
));
4400 return cp_build_function_call (fn
, args
, tf_warning_or_error
);
4406 If no unambiguous matching deallocation function can be found,
4407 propagating the exception does not cause the object's memory to
4412 warning (0, "no corresponding deallocation function for %qD",
4417 error ("no suitable %<operator %s%> for %qT",
4418 operator_name_info
[(int)code
].name
, type
);
4419 return error_mark_node
;
4422 /* If the current scope isn't allowed to access DECL along
4423 BASETYPE_PATH, give an error. The most derived class in
4424 BASETYPE_PATH is the one used to qualify DECL. DIAG_DECL is
4425 the declaration to use in the error diagnostic. */
4428 enforce_access (tree basetype_path
, tree decl
, tree diag_decl
)
4430 gcc_assert (TREE_CODE (basetype_path
) == TREE_BINFO
);
4432 if (!accessible_p (basetype_path
, decl
, true))
4434 if (TREE_PRIVATE (decl
))
4435 error ("%q+#D is private", diag_decl
);
4436 else if (TREE_PROTECTED (decl
))
4437 error ("%q+#D is protected", diag_decl
);
4439 error ("%q+#D is inaccessible", diag_decl
);
4440 error ("within this context");
4447 /* Initialize a temporary of type TYPE with EXPR. The FLAGS are a
4448 bitwise or of LOOKUP_* values. If any errors are warnings are
4449 generated, set *DIAGNOSTIC_FN to "error" or "warning",
4450 respectively. If no diagnostics are generated, set *DIAGNOSTIC_FN
4454 build_temp (tree expr
, tree type
, int flags
,
4455 diagnostic_t
*diagnostic_kind
)
4459 savew
= warningcount
, savee
= errorcount
;
4460 expr
= build_special_member_call (NULL_TREE
,
4461 complete_ctor_identifier
,
4462 build_tree_list (NULL_TREE
, expr
),
4463 type
, flags
, tf_warning_or_error
);
4464 if (warningcount
> savew
)
4465 *diagnostic_kind
= DK_WARNING
;
4466 else if (errorcount
> savee
)
4467 *diagnostic_kind
= DK_ERROR
;
4469 *diagnostic_kind
= 0;
4473 /* Perform warnings about peculiar, but valid, conversions from/to NULL.
4474 EXPR is implicitly converted to type TOTYPE.
4475 FN and ARGNUM are used for diagnostics. */
4478 conversion_null_warnings (tree totype
, tree expr
, tree fn
, int argnum
)
4480 tree t
= non_reference (totype
);
4482 /* Issue warnings about peculiar, but valid, uses of NULL. */
4483 if (expr
== null_node
&& TREE_CODE (t
) != BOOLEAN_TYPE
&& ARITHMETIC_TYPE_P (t
))
4486 warning (OPT_Wconversion
, "passing NULL to non-pointer argument %P of %qD",
4489 warning (OPT_Wconversion
, "converting to non-pointer type %qT from NULL", t
);
4492 /* Issue warnings if "false" is converted to a NULL pointer */
4493 else if (expr
== boolean_false_node
&& fn
&& POINTER_TYPE_P (t
))
4494 warning (OPT_Wconversion
,
4495 "converting %<false%> to pointer type for argument %P of %qD",
4499 /* Perform the conversions in CONVS on the expression EXPR. FN and
4500 ARGNUM are used for diagnostics. ARGNUM is zero based, -1
4501 indicates the `this' argument of a method. INNER is nonzero when
4502 being called to continue a conversion chain. It is negative when a
4503 reference binding will be applied, positive otherwise. If
4504 ISSUE_CONVERSION_WARNINGS is true, warnings about suspicious
4505 conversions will be emitted if appropriate. If C_CAST_P is true,
4506 this conversion is coming from a C-style cast; in that case,
4507 conversions to inaccessible bases are permitted. */
4510 convert_like_real (conversion
*convs
, tree expr
, tree fn
, int argnum
,
4511 int inner
, bool issue_conversion_warnings
,
4512 bool c_cast_p
, tsubst_flags_t complain
)
4514 tree totype
= convs
->type
;
4515 diagnostic_t diag_kind
;
4519 && convs
->kind
!= ck_user
4520 && convs
->kind
!= ck_ambig
4521 && convs
->kind
!= ck_ref_bind
4522 && convs
->kind
!= ck_rvalue
4523 && convs
->kind
!= ck_base
)
4525 conversion
*t
= convs
;
4526 for (; t
; t
= convs
->u
.next
)
4528 if (t
->kind
== ck_user
|| !t
->bad_p
)
4530 expr
= convert_like_real (t
, expr
, fn
, argnum
, 1,
4531 /*issue_conversion_warnings=*/false,
4536 else if (t
->kind
== ck_ambig
)
4537 return convert_like_real (t
, expr
, fn
, argnum
, 1,
4538 /*issue_conversion_warnings=*/false,
4541 else if (t
->kind
== ck_identity
)
4544 if (complain
& tf_error
)
4546 permerror (input_location
, "invalid conversion from %qT to %qT", TREE_TYPE (expr
), totype
);
4548 permerror (input_location
, " initializing argument %P of %qD", argnum
, fn
);
4551 return error_mark_node
;
4553 return cp_convert (totype
, expr
);
4556 if (issue_conversion_warnings
&& (complain
& tf_warning
))
4557 conversion_null_warnings (totype
, expr
, fn
, argnum
);
4559 switch (convs
->kind
)
4563 struct z_candidate
*cand
= convs
->cand
;
4564 tree convfn
= cand
->fn
;
4567 /* When converting from an init list we consider explicit
4568 constructors, but actually trying to call one is an error. */
4569 if (DECL_NONCONVERTING_P (convfn
))
4571 if (complain
& tf_error
)
4572 error ("converting to %qT from initializer list would use "
4573 "explicit constructor %qD", totype
, convfn
);
4575 return error_mark_node
;
4578 /* Set user_conv_p on the argument conversions, so rvalue/base
4579 handling knows not to allow any more UDCs. */
4580 for (i
= 0; i
< cand
->num_convs
; ++i
)
4581 cand
->convs
[i
]->user_conv_p
= true;
4583 expr
= build_over_call (cand
, LOOKUP_NORMAL
, complain
);
4585 /* If this is a constructor or a function returning an aggr type,
4586 we need to build up a TARGET_EXPR. */
4587 if (DECL_CONSTRUCTOR_P (convfn
))
4589 expr
= build_cplus_new (totype
, expr
);
4591 /* Remember that this was list-initialization. */
4592 if (convs
->check_narrowing
)
4593 TARGET_EXPR_LIST_INIT_P (expr
) = true;
4599 if (type_unknown_p (expr
))
4600 expr
= instantiate_type (totype
, expr
, complain
);
4601 /* Convert a constant to its underlying value, unless we are
4602 about to bind it to a reference, in which case we need to
4603 leave it as an lvalue. */
4606 expr
= decl_constant_value (expr
);
4607 if (expr
== null_node
&& INTEGRAL_TYPE_P (totype
))
4608 /* If __null has been converted to an integer type, we do not
4609 want to warn about uses of EXPR as an integer, rather than
4611 expr
= build_int_cst (totype
, 0);
4615 /* Call build_user_type_conversion again for the error. */
4616 return build_user_type_conversion
4617 (totype
, convs
->u
.expr
, LOOKUP_NORMAL
);
4621 /* Conversion to std::initializer_list<T>. */
4622 tree elttype
= TREE_VEC_ELT (CLASSTYPE_TI_ARGS (totype
), 0);
4623 tree new_ctor
= build_constructor (init_list_type_node
, NULL
);
4624 unsigned len
= CONSTRUCTOR_NELTS (expr
);
4625 tree array
, parms
, val
;
4628 /* Convert all the elements. */
4629 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (expr
), ix
, val
)
4631 tree sub
= convert_like_real (convs
->u
.list
[ix
], val
, fn
, argnum
,
4632 1, false, false, complain
);
4633 if (sub
== error_mark_node
)
4635 check_narrowing (TREE_TYPE (sub
), val
);
4636 CONSTRUCTOR_APPEND_ELT (CONSTRUCTOR_ELTS (new_ctor
), NULL_TREE
, sub
);
4638 /* Build up the array. */
4639 elttype
= cp_build_qualified_type
4640 (elttype
, TYPE_QUALS (elttype
) | TYPE_QUAL_CONST
);
4641 array
= build_array_of_n_type (elttype
, len
);
4642 array
= finish_compound_literal (array
, new_ctor
);
4644 parms
= build_tree_list (NULL_TREE
, size_int (len
));
4645 parms
= tree_cons (NULL_TREE
, decay_conversion (array
), parms
);
4646 /* Call the private constructor. */
4647 push_deferring_access_checks (dk_no_check
);
4648 new_ctor
= build_special_member_call
4649 (NULL_TREE
, complete_ctor_identifier
, parms
, totype
, 0, complain
);
4650 pop_deferring_access_checks ();
4651 return build_cplus_new (totype
, new_ctor
);
4655 return get_target_expr (digest_init (totype
, expr
));
4661 expr
= convert_like_real (convs
->u
.next
, expr
, fn
, argnum
,
4662 convs
->kind
== ck_ref_bind
? -1 : 1,
4663 convs
->kind
== ck_ref_bind
? issue_conversion_warnings
: false,
4666 if (expr
== error_mark_node
)
4667 return error_mark_node
;
4669 switch (convs
->kind
)
4672 expr
= convert_bitfield_to_declared_type (expr
);
4673 if (! MAYBE_CLASS_TYPE_P (totype
))
4675 /* Else fall through. */
4677 if (convs
->kind
== ck_base
&& !convs
->need_temporary_p
)
4679 /* We are going to bind a reference directly to a base-class
4680 subobject of EXPR. */
4681 /* Build an expression for `*((base*) &expr)'. */
4682 expr
= cp_build_unary_op (ADDR_EXPR
, expr
, 0, complain
);
4683 expr
= convert_to_base (expr
, build_pointer_type (totype
),
4684 !c_cast_p
, /*nonnull=*/true);
4685 expr
= cp_build_indirect_ref (expr
, "implicit conversion", complain
);
4689 /* Copy-initialization where the cv-unqualified version of the source
4690 type is the same class as, or a derived class of, the class of the
4691 destination [is treated as direct-initialization]. [dcl.init] */
4692 flags
= LOOKUP_NORMAL
|LOOKUP_ONLYCONVERTING
;
4693 if (convs
->user_conv_p
)
4694 /* This conversion is being done in the context of a user-defined
4695 conversion (i.e. the second step of copy-initialization), so
4696 don't allow any more. */
4697 flags
|= LOOKUP_NO_CONVERSION
;
4698 expr
= build_temp (expr
, totype
, flags
, &diag_kind
);
4699 if (diag_kind
&& fn
)
4701 if ((complain
& tf_error
))
4702 emit_diagnostic (diag_kind
, input_location
, 0,
4703 " initializing argument %P of %qD", argnum
, fn
);
4704 else if (diag_kind
== DK_ERROR
)
4705 return error_mark_node
;
4707 return build_cplus_new (totype
, expr
);
4711 tree ref_type
= totype
;
4713 /* If necessary, create a temporary.
4715 VA_ARG_EXPR and CONSTRUCTOR expressions are special cases
4716 that need temporaries, even when their types are reference
4717 compatible with the type of reference being bound, so the
4718 upcoming call to cp_build_unary_op (ADDR_EXPR, expr, ...)
4720 if (convs
->need_temporary_p
4721 || TREE_CODE (expr
) == CONSTRUCTOR
4722 || TREE_CODE (expr
) == VA_ARG_EXPR
)
4724 tree type
= convs
->u
.next
->type
;
4725 cp_lvalue_kind lvalue
= real_lvalue_p (expr
);
4727 if (!CP_TYPE_CONST_NON_VOLATILE_P (TREE_TYPE (ref_type
))
4728 && !TYPE_REF_IS_RVALUE (ref_type
))
4730 if (complain
& tf_error
)
4732 /* If the reference is volatile or non-const, we
4733 cannot create a temporary. */
4734 if (lvalue
& clk_bitfield
)
4735 error ("cannot bind bitfield %qE to %qT",
4737 else if (lvalue
& clk_packed
)
4738 error ("cannot bind packed field %qE to %qT",
4741 error ("cannot bind rvalue %qE to %qT", expr
, ref_type
);
4743 return error_mark_node
;
4745 /* If the source is a packed field, and we must use a copy
4746 constructor, then building the target expr will require
4747 binding the field to the reference parameter to the
4748 copy constructor, and we'll end up with an infinite
4749 loop. If we can use a bitwise copy, then we'll be
4751 if ((lvalue
& clk_packed
)
4752 && CLASS_TYPE_P (type
)
4753 && !TYPE_HAS_TRIVIAL_INIT_REF (type
))
4755 if (complain
& tf_error
)
4756 error ("cannot bind packed field %qE to %qT",
4758 return error_mark_node
;
4760 if (lvalue
& clk_bitfield
)
4762 expr
= convert_bitfield_to_declared_type (expr
);
4763 expr
= fold_convert (type
, expr
);
4765 expr
= build_target_expr_with_type (expr
, type
);
4768 /* Take the address of the thing to which we will bind the
4770 expr
= cp_build_unary_op (ADDR_EXPR
, expr
, 1, complain
);
4771 if (expr
== error_mark_node
)
4772 return error_mark_node
;
4774 /* Convert it to a pointer to the type referred to by the
4775 reference. This will adjust the pointer if a derived to
4776 base conversion is being performed. */
4777 expr
= cp_convert (build_pointer_type (TREE_TYPE (ref_type
)),
4779 /* Convert the pointer to the desired reference type. */
4780 return build_nop (ref_type
, expr
);
4784 return decay_conversion (expr
);
4787 /* Warn about deprecated conversion if appropriate. */
4788 string_conv_p (totype
, expr
, 1);
4793 expr
= convert_to_base (expr
, totype
, !c_cast_p
,
4795 return build_nop (totype
, expr
);
4798 return convert_ptrmem (totype
, expr
, /*allow_inverse_p=*/false,
4805 if (convs
->check_narrowing
)
4806 check_narrowing (totype
, expr
);
4808 if (issue_conversion_warnings
&& (complain
& tf_warning
))
4809 expr
= convert_and_check (totype
, expr
);
4811 expr
= convert (totype
, expr
);
4816 /* Build a call to __builtin_trap. */
4819 call_builtin_trap (void)
4821 tree fn
= implicit_built_in_decls
[BUILT_IN_TRAP
];
4823 gcc_assert (fn
!= NULL
);
4824 fn
= build_call_n (fn
, 0);
4828 /* ARG is being passed to a varargs function. Perform any conversions
4829 required. Return the converted value. */
4832 convert_arg_to_ellipsis (tree arg
)
4836 The lvalue-to-rvalue, array-to-pointer, and function-to-pointer
4837 standard conversions are performed. */
4838 arg
= decay_conversion (arg
);
4841 If the argument has integral or enumeration type that is subject
4842 to the integral promotions (_conv.prom_), or a floating point
4843 type that is subject to the floating point promotion
4844 (_conv.fpprom_), the value of the argument is converted to the
4845 promoted type before the call. */
4846 if (TREE_CODE (TREE_TYPE (arg
)) == REAL_TYPE
4847 && (TYPE_PRECISION (TREE_TYPE (arg
))
4848 < TYPE_PRECISION (double_type_node
)))
4849 arg
= convert_to_real (double_type_node
, arg
);
4850 else if (INTEGRAL_OR_ENUMERATION_TYPE_P (TREE_TYPE (arg
)))
4851 arg
= perform_integral_promotions (arg
);
4853 arg
= require_complete_type (arg
);
4855 if (arg
!= error_mark_node
4856 && !pod_type_p (TREE_TYPE (arg
)))
4858 /* Undefined behavior [expr.call] 5.2.2/7. We used to just warn
4859 here and do a bitwise copy, but now cp_expr_size will abort if we
4861 If the call appears in the context of a sizeof expression,
4862 there is no need to emit a warning, since the expression won't be
4863 evaluated. We keep the builtin_trap just as a safety check. */
4864 if (!skip_evaluation
)
4865 warning (0, "cannot pass objects of non-POD type %q#T through %<...%>; "
4866 "call will abort at runtime", TREE_TYPE (arg
));
4867 arg
= call_builtin_trap ();
4868 arg
= build2 (COMPOUND_EXPR
, integer_type_node
, arg
,
4875 /* va_arg (EXPR, TYPE) is a builtin. Make sure it is not abused. */
4878 build_x_va_arg (tree expr
, tree type
)
4880 if (processing_template_decl
)
4881 return build_min (VA_ARG_EXPR
, type
, expr
);
4883 type
= complete_type_or_else (type
, NULL_TREE
);
4885 if (expr
== error_mark_node
|| !type
)
4886 return error_mark_node
;
4888 if (! pod_type_p (type
))
4890 /* Remove reference types so we don't ICE later on. */
4891 tree type1
= non_reference (type
);
4892 /* Undefined behavior [expr.call] 5.2.2/7. */
4893 warning (0, "cannot receive objects of non-POD type %q#T through %<...%>; "
4894 "call will abort at runtime", type
);
4895 expr
= convert (build_pointer_type (type1
), null_node
);
4896 expr
= build2 (COMPOUND_EXPR
, TREE_TYPE (expr
),
4897 call_builtin_trap (), expr
);
4898 expr
= cp_build_indirect_ref (expr
, NULL
, tf_warning_or_error
);
4902 return build_va_arg (expr
, type
);
4905 /* TYPE has been given to va_arg. Apply the default conversions which
4906 would have happened when passed via ellipsis. Return the promoted
4907 type, or the passed type if there is no change. */
4910 cxx_type_promotes_to (tree type
)
4914 /* Perform the array-to-pointer and function-to-pointer
4916 type
= type_decays_to (type
);
4918 promote
= type_promotes_to (type
);
4919 if (same_type_p (type
, promote
))
4925 /* ARG is a default argument expression being passed to a parameter of
4926 the indicated TYPE, which is a parameter to FN. Do any required
4927 conversions. Return the converted value. */
4929 static GTY(()) VEC(tree
,gc
) *default_arg_context
;
4932 convert_default_arg (tree type
, tree arg
, tree fn
, int parmnum
)
4937 /* If the ARG is an unparsed default argument expression, the
4938 conversion cannot be performed. */
4939 if (TREE_CODE (arg
) == DEFAULT_ARG
)
4941 error ("the default argument for parameter %d of %qD has "
4942 "not yet been parsed",
4944 return error_mark_node
;
4947 /* Detect recursion. */
4948 for (i
= 0; VEC_iterate (tree
, default_arg_context
, i
, t
); ++i
)
4951 error ("recursive evaluation of default argument for %q#D", fn
);
4952 return error_mark_node
;
4954 VEC_safe_push (tree
, gc
, default_arg_context
, fn
);
4956 if (fn
&& DECL_TEMPLATE_INFO (fn
))
4957 arg
= tsubst_default_argument (fn
, type
, arg
);
4963 The names in the expression are bound, and the semantic
4964 constraints are checked, at the point where the default
4965 expressions appears.
4967 we must not perform access checks here. */
4968 push_deferring_access_checks (dk_no_check
);
4969 arg
= break_out_target_exprs (arg
);
4970 if (TREE_CODE (arg
) == CONSTRUCTOR
)
4972 arg
= digest_init (type
, arg
);
4973 arg
= convert_for_initialization (0, type
, arg
, LOOKUP_NORMAL
,
4974 "default argument", fn
, parmnum
,
4975 tf_warning_or_error
);
4979 /* We must make a copy of ARG, in case subsequent processing
4980 alters any part of it. For example, during gimplification a
4981 cast of the form (T) &X::f (where "f" is a member function)
4982 will lead to replacing the PTRMEM_CST for &X::f with a
4983 VAR_DECL. We can avoid the copy for constants, since they
4984 are never modified in place. */
4985 if (!CONSTANT_CLASS_P (arg
))
4986 arg
= unshare_expr (arg
);
4987 arg
= convert_for_initialization (0, type
, arg
, LOOKUP_NORMAL
,
4988 "default argument", fn
, parmnum
,
4989 tf_warning_or_error
);
4990 arg
= convert_for_arg_passing (type
, arg
);
4992 pop_deferring_access_checks();
4994 VEC_pop (tree
, default_arg_context
);
4999 /* Returns the type which will really be used for passing an argument of
5003 type_passed_as (tree type
)
5005 /* Pass classes with copy ctors by invisible reference. */
5006 if (TREE_ADDRESSABLE (type
))
5008 type
= build_reference_type (type
);
5009 /* There are no other pointers to this temporary. */
5010 type
= build_qualified_type (type
, TYPE_QUAL_RESTRICT
);
5012 else if (targetm
.calls
.promote_prototypes (type
)
5013 && INTEGRAL_TYPE_P (type
)
5014 && COMPLETE_TYPE_P (type
)
5015 && INT_CST_LT_UNSIGNED (TYPE_SIZE (type
),
5016 TYPE_SIZE (integer_type_node
)))
5017 type
= integer_type_node
;
5022 /* Actually perform the appropriate conversion. */
5025 convert_for_arg_passing (tree type
, tree val
)
5029 /* If VAL is a bitfield, then -- since it has already been converted
5030 to TYPE -- it cannot have a precision greater than TYPE.
5032 If it has a smaller precision, we must widen it here. For
5033 example, passing "int f:3;" to a function expecting an "int" will
5034 not result in any conversion before this point.
5036 If the precision is the same we must not risk widening. For
5037 example, the COMPONENT_REF for a 32-bit "long long" bitfield will
5038 often have type "int", even though the C++ type for the field is
5039 "long long". If the value is being passed to a function
5040 expecting an "int", then no conversions will be required. But,
5041 if we call convert_bitfield_to_declared_type, the bitfield will
5042 be converted to "long long". */
5043 bitfield_type
= is_bitfield_expr_with_lowered_type (val
);
5045 && TYPE_PRECISION (TREE_TYPE (val
)) < TYPE_PRECISION (type
))
5046 val
= convert_to_integer (TYPE_MAIN_VARIANT (bitfield_type
), val
);
5048 if (val
== error_mark_node
)
5050 /* Pass classes with copy ctors by invisible reference. */
5051 else if (TREE_ADDRESSABLE (type
))
5052 val
= build1 (ADDR_EXPR
, build_reference_type (type
), val
);
5053 else if (targetm
.calls
.promote_prototypes (type
)
5054 && INTEGRAL_TYPE_P (type
)
5055 && COMPLETE_TYPE_P (type
)
5056 && INT_CST_LT_UNSIGNED (TYPE_SIZE (type
),
5057 TYPE_SIZE (integer_type_node
)))
5058 val
= perform_integral_promotions (val
);
5059 if (warn_missing_format_attribute
)
5061 tree rhstype
= TREE_TYPE (val
);
5062 const enum tree_code coder
= TREE_CODE (rhstype
);
5063 const enum tree_code codel
= TREE_CODE (type
);
5064 if ((codel
== POINTER_TYPE
|| codel
== REFERENCE_TYPE
)
5066 && check_missing_format_attribute (type
, rhstype
))
5067 warning (OPT_Wmissing_format_attribute
,
5068 "argument of function call might be a candidate for a format attribute");
5073 /* Returns true iff FN is a function with magic varargs, i.e. ones for
5074 which no conversions at all should be done. This is true for some
5075 builtins which don't act like normal functions. */
5078 magic_varargs_p (tree fn
)
5080 if (DECL_BUILT_IN (fn
))
5081 switch (DECL_FUNCTION_CODE (fn
))
5083 case BUILT_IN_CLASSIFY_TYPE
:
5084 case BUILT_IN_CONSTANT_P
:
5085 case BUILT_IN_NEXT_ARG
:
5086 case BUILT_IN_VA_START
:
5090 return lookup_attribute ("type generic",
5091 TYPE_ATTRIBUTES (TREE_TYPE (fn
))) != 0;
5097 /* Subroutine of the various build_*_call functions. Overload resolution
5098 has chosen a winning candidate CAND; build up a CALL_EXPR accordingly.
5099 ARGS is a TREE_LIST of the unconverted arguments to the call. FLAGS is a
5100 bitmask of various LOOKUP_* flags which apply to the call itself. */
5103 build_over_call (struct z_candidate
*cand
, int flags
, tsubst_flags_t complain
)
5106 tree args
= cand
->args
;
5107 conversion
**convs
= cand
->convs
;
5109 tree parm
= TYPE_ARG_TYPES (TREE_TYPE (fn
));
5117 bool already_used
= false;
5119 /* In a template, there is no need to perform all of the work that
5120 is normally done. We are only interested in the type of the call
5121 expression, i.e., the return type of the function. Any semantic
5122 errors will be deferred until the template is instantiated. */
5123 if (processing_template_decl
)
5127 return_type
= TREE_TYPE (TREE_TYPE (fn
));
5128 expr
= build_call_list (return_type
, build_addr_func (fn
), args
);
5129 if (TREE_THIS_VOLATILE (fn
) && cfun
)
5130 current_function_returns_abnormally
= 1;
5131 if (!VOID_TYPE_P (return_type
))
5132 require_complete_type (return_type
);
5133 return convert_from_reference (expr
);
5136 /* Give any warnings we noticed during overload resolution. */
5139 struct candidate_warning
*w
;
5140 for (w
= cand
->warnings
; w
; w
= w
->next
)
5141 joust (cand
, w
->loser
, 1);
5144 /* Make =delete work with SFINAE. */
5145 if (DECL_DELETED_FN (fn
) && !(complain
& tf_error
))
5146 return error_mark_node
;
5148 if (DECL_FUNCTION_MEMBER_P (fn
))
5150 /* If FN is a template function, two cases must be considered.
5155 template <class T> void f();
5157 template <class T> struct B {
5161 struct C : A, B<int> {
5163 using B<int>::g; // #2
5166 In case #1 where `A::f' is a member template, DECL_ACCESS is
5167 recorded in the primary template but not in its specialization.
5168 We check access of FN using its primary template.
5170 In case #2, where `B<int>::g' has a DECL_TEMPLATE_INFO simply
5171 because it is a member of class template B, DECL_ACCESS is
5172 recorded in the specialization `B<int>::g'. We cannot use its
5173 primary template because `B<T>::g' and `B<int>::g' may have
5174 different access. */
5175 if (DECL_TEMPLATE_INFO (fn
)
5176 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (fn
)))
5177 perform_or_defer_access_check (cand
->access_path
,
5178 DECL_TI_TEMPLATE (fn
), fn
);
5180 perform_or_defer_access_check (cand
->access_path
, fn
, fn
);
5183 if (args
&& TREE_CODE (args
) != TREE_LIST
)
5184 args
= build_tree_list (NULL_TREE
, args
);
5187 /* Find maximum size of vector to hold converted arguments. */
5188 parmlen
= list_length (parm
);
5189 nargs
= list_length (args
);
5190 if (parmlen
> nargs
)
5192 argarray
= (tree
*) alloca (nargs
* sizeof (tree
));
5194 /* The implicit parameters to a constructor are not considered by overload
5195 resolution, and must be of the proper type. */
5196 if (DECL_CONSTRUCTOR_P (fn
))
5198 argarray
[j
++] = TREE_VALUE (arg
);
5199 arg
= TREE_CHAIN (arg
);
5200 parm
= TREE_CHAIN (parm
);
5201 /* We should never try to call the abstract constructor. */
5202 gcc_assert (!DECL_HAS_IN_CHARGE_PARM_P (fn
));
5204 if (DECL_HAS_VTT_PARM_P (fn
))
5206 argarray
[j
++] = TREE_VALUE (arg
);
5207 arg
= TREE_CHAIN (arg
);
5208 parm
= TREE_CHAIN (parm
);
5211 /* Bypass access control for 'this' parameter. */
5212 else if (TREE_CODE (TREE_TYPE (fn
)) == METHOD_TYPE
)
5214 tree parmtype
= TREE_VALUE (parm
);
5215 tree argtype
= TREE_TYPE (TREE_VALUE (arg
));
5219 if (convs
[i
]->bad_p
)
5221 if (complain
& tf_error
)
5222 permerror (input_location
, "passing %qT as %<this%> argument of %q#D discards qualifiers",
5223 TREE_TYPE (argtype
), fn
);
5225 return error_mark_node
;
5228 /* [class.mfct.nonstatic]: If a nonstatic member function of a class
5229 X is called for an object that is not of type X, or of a type
5230 derived from X, the behavior is undefined.
5232 So we can assume that anything passed as 'this' is non-null, and
5233 optimize accordingly. */
5234 gcc_assert (TREE_CODE (parmtype
) == POINTER_TYPE
);
5235 /* Convert to the base in which the function was declared. */
5236 gcc_assert (cand
->conversion_path
!= NULL_TREE
);
5237 converted_arg
= build_base_path (PLUS_EXPR
,
5239 cand
->conversion_path
,
5241 /* Check that the base class is accessible. */
5242 if (!accessible_base_p (TREE_TYPE (argtype
),
5243 BINFO_TYPE (cand
->conversion_path
), true))
5244 error ("%qT is not an accessible base of %qT",
5245 BINFO_TYPE (cand
->conversion_path
),
5246 TREE_TYPE (argtype
));
5247 /* If fn was found by a using declaration, the conversion path
5248 will be to the derived class, not the base declaring fn. We
5249 must convert from derived to base. */
5250 base_binfo
= lookup_base (TREE_TYPE (TREE_TYPE (converted_arg
)),
5251 TREE_TYPE (parmtype
), ba_unique
, NULL
);
5252 converted_arg
= build_base_path (PLUS_EXPR
, converted_arg
,
5255 argarray
[j
++] = converted_arg
;
5256 parm
= TREE_CHAIN (parm
);
5257 arg
= TREE_CHAIN (arg
);
5263 parm
= TREE_CHAIN (parm
), arg
= TREE_CHAIN (arg
), ++i
)
5265 tree type
= TREE_VALUE (parm
);
5269 /* Don't make a copy here if build_call is going to. */
5270 if (conv
->kind
== ck_rvalue
5271 && COMPLETE_TYPE_P (complete_type (type
))
5272 && !TREE_ADDRESSABLE (type
))
5273 conv
= conv
->u
.next
;
5275 val
= convert_like_with_context
5276 (conv
, TREE_VALUE (arg
), fn
, i
- is_method
, complain
);
5278 val
= convert_for_arg_passing (type
, val
);
5279 if ((complain
== tf_none
) && val
== error_mark_node
)
5280 return error_mark_node
;
5282 argarray
[j
++] = val
;
5285 /* Default arguments */
5286 for (; parm
&& parm
!= void_list_node
; parm
= TREE_CHAIN (parm
), i
++)
5287 argarray
[j
++] = convert_default_arg (TREE_VALUE (parm
),
5288 TREE_PURPOSE (parm
),
5291 for (; arg
; arg
= TREE_CHAIN (arg
))
5293 tree a
= TREE_VALUE (arg
);
5294 if (magic_varargs_p (fn
))
5295 /* Do no conversions for magic varargs. */;
5297 a
= convert_arg_to_ellipsis (a
);
5301 gcc_assert (j
<= nargs
);
5304 check_function_arguments (TYPE_ATTRIBUTES (TREE_TYPE (fn
)),
5305 nargs
, argarray
, TYPE_ARG_TYPES (TREE_TYPE (fn
)));
5307 /* Avoid actually calling copy constructors and copy assignment operators,
5310 if (! flag_elide_constructors
)
5311 /* Do things the hard way. */;
5312 else if (cand
->num_convs
== 1
5313 && (DECL_COPY_CONSTRUCTOR_P (fn
)
5314 || DECL_MOVE_CONSTRUCTOR_P (fn
)))
5317 arg
= argarray
[num_artificial_parms_for (fn
)];
5319 /* Pull out the real argument, disregarding const-correctness. */
5321 while (CONVERT_EXPR_P (targ
)
5322 || TREE_CODE (targ
) == NON_LVALUE_EXPR
)
5323 targ
= TREE_OPERAND (targ
, 0);
5324 if (TREE_CODE (targ
) == ADDR_EXPR
)
5326 targ
= TREE_OPERAND (targ
, 0);
5327 if (!same_type_ignoring_top_level_qualifiers_p
5328 (TREE_TYPE (TREE_TYPE (arg
)), TREE_TYPE (targ
)))
5337 arg
= cp_build_indirect_ref (arg
, 0, complain
);
5339 if (TREE_CODE (arg
) == TARGET_EXPR
5340 && TARGET_EXPR_LIST_INIT_P (arg
))
5342 /* Copy-list-initialization doesn't require the copy constructor
5345 /* [class.copy]: the copy constructor is implicitly defined even if
5346 the implementation elided its use. */
5347 else if (TYPE_HAS_COMPLEX_INIT_REF (DECL_CONTEXT (fn
)))
5350 already_used
= true;
5353 /* If we're creating a temp and we already have one, don't create a
5354 new one. If we're not creating a temp but we get one, use
5355 INIT_EXPR to collapse the temp into our target. Otherwise, if the
5356 ctor is trivial, do a bitwise copy with a simple TARGET_EXPR for a
5357 temp or an INIT_EXPR otherwise. */
5358 if (integer_zerop (TREE_VALUE (args
)))
5360 if (TREE_CODE (arg
) == TARGET_EXPR
)
5362 else if (TYPE_HAS_TRIVIAL_INIT_REF (DECL_CONTEXT (fn
)))
5363 return build_target_expr_with_type (arg
, DECL_CONTEXT (fn
));
5365 else if (TREE_CODE (arg
) == TARGET_EXPR
5366 || (TYPE_HAS_TRIVIAL_INIT_REF (DECL_CONTEXT (fn
))
5367 && !move_fn_p (fn
)))
5369 tree to
= stabilize_reference
5370 (cp_build_indirect_ref (TREE_VALUE (args
), 0, complain
));
5372 val
= build2 (INIT_EXPR
, DECL_CONTEXT (fn
), to
, arg
);
5376 else if (DECL_OVERLOADED_OPERATOR_P (fn
) == NOP_EXPR
5378 && TYPE_HAS_TRIVIAL_ASSIGN_REF (DECL_CONTEXT (fn
)))
5380 tree to
= stabilize_reference
5381 (cp_build_indirect_ref (argarray
[0], 0, complain
));
5382 tree type
= TREE_TYPE (to
);
5383 tree as_base
= CLASSTYPE_AS_BASE (type
);
5386 if (tree_int_cst_equal (TYPE_SIZE (type
), TYPE_SIZE (as_base
)))
5388 arg
= cp_build_indirect_ref (arg
, 0, complain
);
5389 val
= build2 (MODIFY_EXPR
, TREE_TYPE (to
), to
, arg
);
5393 /* We must only copy the non-tail padding parts.
5394 Use __builtin_memcpy for the bitwise copy. */
5396 tree arg0
, arg1
, arg2
, t
;
5398 arg2
= TYPE_SIZE_UNIT (as_base
);
5400 arg0
= cp_build_unary_op (ADDR_EXPR
, to
, 0, complain
);
5401 t
= implicit_built_in_decls
[BUILT_IN_MEMCPY
];
5402 t
= build_call_n (t
, 3, arg0
, arg1
, arg2
);
5404 t
= convert (TREE_TYPE (arg0
), t
);
5405 val
= cp_build_indirect_ref (t
, 0, complain
);
5414 if (DECL_VINDEX (fn
) && (flags
& LOOKUP_NONVIRTUAL
) == 0)
5417 tree binfo
= lookup_base (TREE_TYPE (TREE_TYPE (argarray
[0])),
5420 gcc_assert (binfo
&& binfo
!= error_mark_node
);
5422 /* Warn about deprecated virtual functions now, since we're about
5423 to throw away the decl. */
5424 if (TREE_DEPRECATED (fn
))
5425 warn_deprecated_use (fn
);
5427 argarray
[0] = build_base_path (PLUS_EXPR
, argarray
[0], binfo
, 1);
5428 if (TREE_SIDE_EFFECTS (argarray
[0]))
5429 argarray
[0] = save_expr (argarray
[0]);
5430 t
= build_pointer_type (TREE_TYPE (fn
));
5431 if (DECL_CONTEXT (fn
) && TYPE_JAVA_INTERFACE (DECL_CONTEXT (fn
)))
5432 fn
= build_java_interface_fn_ref (fn
, argarray
[0]);
5434 fn
= build_vfn_ref (argarray
[0], DECL_VINDEX (fn
));
5438 fn
= build_addr_func (fn
);
5440 return build_cxx_call (fn
, nargs
, argarray
);
5443 /* Build and return a call to FN, using NARGS arguments in ARGARRAY.
5444 This function performs no overload resolution, conversion, or other
5445 high-level operations. */
5448 build_cxx_call (tree fn
, int nargs
, tree
*argarray
)
5452 fn
= build_call_a (fn
, nargs
, argarray
);
5454 /* If this call might throw an exception, note that fact. */
5455 fndecl
= get_callee_fndecl (fn
);
5456 if ((!fndecl
|| !TREE_NOTHROW (fndecl
))
5457 && at_function_scope_p ()
5459 cp_function_chain
->can_throw
= 1;
5461 /* Check that arguments to builtin functions match the expectations. */
5463 && DECL_BUILT_IN (fndecl
)
5464 && DECL_BUILT_IN_CLASS (fndecl
) == BUILT_IN_NORMAL
5465 && !check_builtin_function_arguments (fndecl
, nargs
, argarray
))
5466 return error_mark_node
;
5468 /* Some built-in function calls will be evaluated at compile-time in
5470 fn
= fold_if_not_in_template (fn
);
5472 if (VOID_TYPE_P (TREE_TYPE (fn
)))
5475 fn
= require_complete_type (fn
);
5476 if (fn
== error_mark_node
)
5477 return error_mark_node
;
5479 if (MAYBE_CLASS_TYPE_P (TREE_TYPE (fn
)))
5480 fn
= build_cplus_new (TREE_TYPE (fn
), fn
);
5481 return convert_from_reference (fn
);
5484 static GTY(()) tree java_iface_lookup_fn
;
5486 /* Make an expression which yields the address of the Java interface
5487 method FN. This is achieved by generating a call to libjava's
5488 _Jv_LookupInterfaceMethodIdx(). */
5491 build_java_interface_fn_ref (tree fn
, tree instance
)
5493 tree lookup_fn
, method
, idx
;
5494 tree klass_ref
, iface
, iface_ref
;
5497 if (!java_iface_lookup_fn
)
5499 tree endlink
= build_void_list_node ();
5500 tree t
= tree_cons (NULL_TREE
, ptr_type_node
,
5501 tree_cons (NULL_TREE
, ptr_type_node
,
5502 tree_cons (NULL_TREE
, java_int_type_node
,
5504 java_iface_lookup_fn
5505 = add_builtin_function ("_Jv_LookupInterfaceMethodIdx",
5506 build_function_type (ptr_type_node
, t
),
5507 0, NOT_BUILT_IN
, NULL
, NULL_TREE
);
5510 /* Look up the pointer to the runtime java.lang.Class object for `instance'.
5511 This is the first entry in the vtable. */
5512 klass_ref
= build_vtbl_ref (cp_build_indirect_ref (instance
, 0,
5513 tf_warning_or_error
),
5516 /* Get the java.lang.Class pointer for the interface being called. */
5517 iface
= DECL_CONTEXT (fn
);
5518 iface_ref
= lookup_field (iface
, get_identifier ("class$"), 0, false);
5519 if (!iface_ref
|| TREE_CODE (iface_ref
) != VAR_DECL
5520 || DECL_CONTEXT (iface_ref
) != iface
)
5522 error ("could not find class$ field in java interface type %qT",
5524 return error_mark_node
;
5526 iface_ref
= build_address (iface_ref
);
5527 iface_ref
= convert (build_pointer_type (iface
), iface_ref
);
5529 /* Determine the itable index of FN. */
5531 for (method
= TYPE_METHODS (iface
); method
; method
= TREE_CHAIN (method
))
5533 if (!DECL_VIRTUAL_P (method
))
5539 idx
= build_int_cst (NULL_TREE
, i
);
5541 lookup_fn
= build1 (ADDR_EXPR
,
5542 build_pointer_type (TREE_TYPE (java_iface_lookup_fn
)),
5543 java_iface_lookup_fn
);
5544 return build_call_nary (ptr_type_node
, lookup_fn
,
5545 3, klass_ref
, iface_ref
, idx
);
5548 /* Returns the value to use for the in-charge parameter when making a
5549 call to a function with the indicated NAME.
5551 FIXME:Can't we find a neater way to do this mapping? */
5554 in_charge_arg_for_name (tree name
)
5556 if (name
== base_ctor_identifier
5557 || name
== base_dtor_identifier
)
5558 return integer_zero_node
;
5559 else if (name
== complete_ctor_identifier
)
5560 return integer_one_node
;
5561 else if (name
== complete_dtor_identifier
)
5562 return integer_two_node
;
5563 else if (name
== deleting_dtor_identifier
)
5564 return integer_three_node
;
5566 /* This function should only be called with one of the names listed
5572 /* Build a call to a constructor, destructor, or an assignment
5573 operator for INSTANCE, an expression with class type. NAME
5574 indicates the special member function to call; ARGS are the
5575 arguments. BINFO indicates the base of INSTANCE that is to be
5576 passed as the `this' parameter to the member function called.
5578 FLAGS are the LOOKUP_* flags to use when processing the call.
5580 If NAME indicates a complete object constructor, INSTANCE may be
5581 NULL_TREE. In this case, the caller will call build_cplus_new to
5582 store the newly constructed object into a VAR_DECL. */
5585 build_special_member_call (tree instance
, tree name
, tree args
,
5586 tree binfo
, int flags
, tsubst_flags_t complain
)
5589 /* The type of the subobject to be constructed or destroyed. */
5592 gcc_assert (name
== complete_ctor_identifier
5593 || name
== base_ctor_identifier
5594 || name
== complete_dtor_identifier
5595 || name
== base_dtor_identifier
5596 || name
== deleting_dtor_identifier
5597 || name
== ansi_assopname (NOP_EXPR
));
5600 /* Resolve the name. */
5601 if (!complete_type_or_else (binfo
, NULL_TREE
))
5602 return error_mark_node
;
5604 binfo
= TYPE_BINFO (binfo
);
5607 gcc_assert (binfo
!= NULL_TREE
);
5609 class_type
= BINFO_TYPE (binfo
);
5611 /* Handle the special case where INSTANCE is NULL_TREE. */
5612 if (name
== complete_ctor_identifier
&& !instance
)
5614 instance
= build_int_cst (build_pointer_type (class_type
), 0);
5615 instance
= build1 (INDIRECT_REF
, class_type
, instance
);
5619 if (name
== complete_dtor_identifier
5620 || name
== base_dtor_identifier
5621 || name
== deleting_dtor_identifier
)
5622 gcc_assert (args
== NULL_TREE
);
5624 /* Convert to the base class, if necessary. */
5625 if (!same_type_ignoring_top_level_qualifiers_p
5626 (TREE_TYPE (instance
), BINFO_TYPE (binfo
)))
5628 if (name
!= ansi_assopname (NOP_EXPR
))
5629 /* For constructors and destructors, either the base is
5630 non-virtual, or it is virtual but we are doing the
5631 conversion from a constructor or destructor for the
5632 complete object. In either case, we can convert
5634 instance
= convert_to_base_statically (instance
, binfo
);
5636 /* However, for assignment operators, we must convert
5637 dynamically if the base is virtual. */
5638 instance
= build_base_path (PLUS_EXPR
, instance
,
5639 binfo
, /*nonnull=*/1);
5643 gcc_assert (instance
!= NULL_TREE
);
5645 fns
= lookup_fnfields (binfo
, name
, 1);
5647 /* When making a call to a constructor or destructor for a subobject
5648 that uses virtual base classes, pass down a pointer to a VTT for
5650 if ((name
== base_ctor_identifier
5651 || name
== base_dtor_identifier
)
5652 && CLASSTYPE_VBASECLASSES (class_type
))
5657 /* If the current function is a complete object constructor
5658 or destructor, then we fetch the VTT directly.
5659 Otherwise, we look it up using the VTT we were given. */
5660 vtt
= TREE_CHAIN (CLASSTYPE_VTABLES (current_class_type
));
5661 vtt
= decay_conversion (vtt
);
5662 vtt
= build3 (COND_EXPR
, TREE_TYPE (vtt
),
5663 build2 (EQ_EXPR
, boolean_type_node
,
5664 current_in_charge_parm
, integer_zero_node
),
5667 gcc_assert (BINFO_SUBVTT_INDEX (binfo
));
5668 sub_vtt
= build2 (POINTER_PLUS_EXPR
, TREE_TYPE (vtt
), vtt
,
5669 BINFO_SUBVTT_INDEX (binfo
));
5671 args
= tree_cons (NULL_TREE
, sub_vtt
, args
);
5674 return build_new_method_call (instance
, fns
, args
,
5675 TYPE_BINFO (BINFO_TYPE (binfo
)),
5680 /* Return the NAME, as a C string. The NAME indicates a function that
5681 is a member of TYPE. *FREE_P is set to true if the caller must
5682 free the memory returned.
5684 Rather than go through all of this, we should simply set the names
5685 of constructors and destructors appropriately, and dispense with
5686 ctor_identifier, dtor_identifier, etc. */
5689 name_as_c_string (tree name
, tree type
, bool *free_p
)
5693 /* Assume that we will not allocate memory. */
5695 /* Constructors and destructors are special. */
5696 if (IDENTIFIER_CTOR_OR_DTOR_P (name
))
5699 = CONST_CAST (char *, IDENTIFIER_POINTER (constructor_name (type
)));
5700 /* For a destructor, add the '~'. */
5701 if (name
== complete_dtor_identifier
5702 || name
== base_dtor_identifier
5703 || name
== deleting_dtor_identifier
)
5705 pretty_name
= concat ("~", pretty_name
, NULL
);
5706 /* Remember that we need to free the memory allocated. */
5710 else if (IDENTIFIER_TYPENAME_P (name
))
5712 pretty_name
= concat ("operator ",
5713 type_as_string (TREE_TYPE (name
),
5714 TFF_PLAIN_IDENTIFIER
),
5716 /* Remember that we need to free the memory allocated. */
5720 pretty_name
= CONST_CAST (char *, IDENTIFIER_POINTER (name
));
5725 /* Build a call to "INSTANCE.FN (ARGS)". If FN_P is non-NULL, it will
5726 be set, upon return, to the function called. */
5729 build_new_method_call (tree instance
, tree fns
, tree args
,
5730 tree conversion_path
, int flags
,
5731 tree
*fn_p
, tsubst_flags_t complain
)
5733 struct z_candidate
*candidates
= 0, *cand
;
5734 tree explicit_targs
= NULL_TREE
;
5735 tree basetype
= NULL_TREE
;
5738 tree mem_args
= NULL_TREE
, instance_ptr
;
5744 int template_only
= 0;
5751 gcc_assert (instance
!= NULL_TREE
);
5753 /* We don't know what function we're going to call, yet. */
5757 if (error_operand_p (instance
)
5758 || error_operand_p (fns
)
5759 || args
== error_mark_node
)
5760 return error_mark_node
;
5762 if (!BASELINK_P (fns
))
5764 if (complain
& tf_error
)
5765 error ("call to non-function %qD", fns
);
5766 return error_mark_node
;
5769 orig_instance
= instance
;
5773 /* Dismantle the baselink to collect all the information we need. */
5774 if (!conversion_path
)
5775 conversion_path
= BASELINK_BINFO (fns
);
5776 access_binfo
= BASELINK_ACCESS_BINFO (fns
);
5777 optype
= BASELINK_OPTYPE (fns
);
5778 fns
= BASELINK_FUNCTIONS (fns
);
5779 if (TREE_CODE (fns
) == TEMPLATE_ID_EXPR
)
5781 explicit_targs
= TREE_OPERAND (fns
, 1);
5782 fns
= TREE_OPERAND (fns
, 0);
5785 gcc_assert (TREE_CODE (fns
) == FUNCTION_DECL
5786 || TREE_CODE (fns
) == TEMPLATE_DECL
5787 || TREE_CODE (fns
) == OVERLOAD
);
5788 fn
= get_first_fn (fns
);
5789 name
= DECL_NAME (fn
);
5791 basetype
= TYPE_MAIN_VARIANT (TREE_TYPE (instance
));
5792 gcc_assert (CLASS_TYPE_P (basetype
));
5794 if (processing_template_decl
)
5796 instance
= build_non_dependent_expr (instance
);
5797 args
= build_non_dependent_args (orig_args
);
5800 /* The USER_ARGS are the arguments we will display to users if an
5801 error occurs. The USER_ARGS should not include any
5802 compiler-generated arguments. The "this" pointer hasn't been
5803 added yet. However, we must remove the VTT pointer if this is a
5804 call to a base-class constructor or destructor. */
5806 if (IDENTIFIER_CTOR_OR_DTOR_P (name
))
5808 /* Callers should explicitly indicate whether they want to construct
5809 the complete object or just the part without virtual bases. */
5810 gcc_assert (name
!= ctor_identifier
);
5811 /* Similarly for destructors. */
5812 gcc_assert (name
!= dtor_identifier
);
5813 /* Remove the VTT pointer, if present. */
5814 if ((name
== base_ctor_identifier
|| name
== base_dtor_identifier
)
5815 && CLASSTYPE_VBASECLASSES (basetype
))
5816 user_args
= TREE_CHAIN (user_args
);
5819 /* Process the argument list. */
5820 args
= resolve_args (args
);
5821 if (args
== error_mark_node
)
5822 return error_mark_node
;
5824 instance_ptr
= build_this (instance
);
5826 /* It's OK to call destructors and constructors on cv-qualified objects.
5827 Therefore, convert the INSTANCE_PTR to the unqualified type, if
5829 if (DECL_DESTRUCTOR_P (fn
)
5830 || DECL_CONSTRUCTOR_P (fn
))
5832 tree type
= build_pointer_type (basetype
);
5833 if (!same_type_p (type
, TREE_TYPE (instance_ptr
)))
5834 instance_ptr
= build_nop (type
, instance_ptr
);
5836 if (DECL_DESTRUCTOR_P (fn
))
5837 name
= complete_dtor_identifier
;
5839 /* If CONSTRUCTOR_IS_DIRECT_INIT is set, this was a T{ } form
5840 initializer, not T({ }). If the type doesn't have a list ctor,
5841 break apart the list into separate ctor args. */
5842 if (DECL_CONSTRUCTOR_P (fn
) && args
5843 && BRACE_ENCLOSED_INITIALIZER_P (TREE_VALUE (args
))
5844 && CONSTRUCTOR_IS_DIRECT_INIT (TREE_VALUE (args
))
5845 && !TYPE_HAS_LIST_CTOR (basetype
))
5847 gcc_assert (TREE_CHAIN (args
) == NULL_TREE
);
5848 args
= ctor_to_list (TREE_VALUE (args
));
5851 class_type
= (conversion_path
? BINFO_TYPE (conversion_path
) : NULL_TREE
);
5852 mem_args
= tree_cons (NULL_TREE
, instance_ptr
, args
);
5854 /* Get the high-water mark for the CONVERSION_OBSTACK. */
5855 p
= conversion_obstack_alloc (0);
5857 for (fn
= fns
; fn
; fn
= OVL_NEXT (fn
))
5859 tree t
= OVL_CURRENT (fn
);
5862 /* We can end up here for copy-init of same or base class. */
5863 if ((flags
& LOOKUP_ONLYCONVERTING
)
5864 && DECL_NONCONVERTING_P (t
))
5867 if (DECL_NONSTATIC_MEMBER_FUNCTION_P (t
))
5868 this_arglist
= mem_args
;
5870 this_arglist
= args
;
5872 if (TREE_CODE (t
) == TEMPLATE_DECL
)
5873 /* A member template. */
5874 add_template_candidate (&candidates
, t
,
5877 this_arglist
, optype
,
5882 else if (! template_only
)
5883 add_function_candidate (&candidates
, t
,
5891 candidates
= splice_viable (candidates
, pedantic
, &any_viable_p
);
5894 if (complain
& tf_error
)
5896 if (!COMPLETE_TYPE_P (basetype
))
5897 cxx_incomplete_type_error (instance_ptr
, basetype
);
5903 pretty_name
= name_as_c_string (name
, basetype
, &free_p
);
5904 error ("no matching function for call to %<%T::%s(%A)%#V%>",
5905 basetype
, pretty_name
, user_args
,
5906 TREE_TYPE (TREE_TYPE (instance_ptr
)));
5910 print_z_candidates (candidates
);
5912 call
= error_mark_node
;
5916 cand
= tourney (candidates
);
5922 if (complain
& tf_error
)
5924 pretty_name
= name_as_c_string (name
, basetype
, &free_p
);
5925 error ("call of overloaded %<%s(%A)%> is ambiguous", pretty_name
,
5927 print_z_candidates (candidates
);
5931 call
= error_mark_node
;
5937 if (!(flags
& LOOKUP_NONVIRTUAL
)
5938 && DECL_PURE_VIRTUAL_P (fn
)
5939 && instance
== current_class_ref
5940 && (DECL_CONSTRUCTOR_P (current_function_decl
)
5941 || DECL_DESTRUCTOR_P (current_function_decl
))
5942 && (complain
& tf_warning
))
5943 /* This is not an error, it is runtime undefined
5945 warning (0, (DECL_CONSTRUCTOR_P (current_function_decl
) ?
5946 "abstract virtual %q#D called from constructor"
5947 : "abstract virtual %q#D called from destructor"),
5950 if (TREE_CODE (TREE_TYPE (fn
)) == METHOD_TYPE
5951 && is_dummy_object (instance_ptr
))
5953 if (complain
& tf_error
)
5954 error ("cannot call member function %qD without object",
5956 call
= error_mark_node
;
5960 if (DECL_VINDEX (fn
) && ! (flags
& LOOKUP_NONVIRTUAL
)
5961 && resolves_to_fixed_type_p (instance
, 0))
5962 flags
|= LOOKUP_NONVIRTUAL
;
5963 /* Now we know what function is being called. */
5966 /* Build the actual CALL_EXPR. */
5967 call
= build_over_call (cand
, flags
, complain
);
5968 /* In an expression of the form `a->f()' where `f' turns
5969 out to be a static member function, `a' is
5970 none-the-less evaluated. */
5971 if (TREE_CODE (TREE_TYPE (fn
)) != METHOD_TYPE
5972 && !is_dummy_object (instance_ptr
)
5973 && TREE_SIDE_EFFECTS (instance_ptr
))
5974 call
= build2 (COMPOUND_EXPR
, TREE_TYPE (call
),
5975 instance_ptr
, call
);
5976 else if (call
!= error_mark_node
5977 && DECL_DESTRUCTOR_P (cand
->fn
)
5978 && !VOID_TYPE_P (TREE_TYPE (call
)))
5979 /* An explicit call of the form "x->~X()" has type
5980 "void". However, on platforms where destructors
5981 return "this" (i.e., those where
5982 targetm.cxx.cdtor_returns_this is true), such calls
5983 will appear to have a return value of pointer type
5984 to the low-level call machinery. We do not want to
5985 change the low-level machinery, since we want to be
5986 able to optimize "delete f()" on such platforms as
5987 "operator delete(~X(f()))" (rather than generating
5988 "t = f(), ~X(t), operator delete (t)"). */
5989 call
= build_nop (void_type_node
, call
);
5994 if (processing_template_decl
&& call
!= error_mark_node
)
5996 bool cast_to_void
= false;
5998 if (TREE_CODE (call
) == COMPOUND_EXPR
)
5999 call
= TREE_OPERAND (call
, 1);
6000 else if (TREE_CODE (call
) == NOP_EXPR
)
6002 cast_to_void
= true;
6003 call
= TREE_OPERAND (call
, 0);
6005 if (TREE_CODE (call
) == INDIRECT_REF
)
6006 call
= TREE_OPERAND (call
, 0);
6007 call
= (build_min_non_dep_call_list
6009 build_min (COMPONENT_REF
, TREE_TYPE (CALL_EXPR_FN (call
)),
6010 orig_instance
, orig_fns
, NULL_TREE
),
6012 call
= convert_from_reference (call
);
6014 call
= build_nop (void_type_node
, call
);
6017 /* Free all the conversions we allocated. */
6018 obstack_free (&conversion_obstack
, p
);
6023 /* Returns true iff standard conversion sequence ICS1 is a proper
6024 subsequence of ICS2. */
6027 is_subseq (conversion
*ics1
, conversion
*ics2
)
6029 /* We can assume that a conversion of the same code
6030 between the same types indicates a subsequence since we only get
6031 here if the types we are converting from are the same. */
6033 while (ics1
->kind
== ck_rvalue
6034 || ics1
->kind
== ck_lvalue
)
6035 ics1
= ics1
->u
.next
;
6039 while (ics2
->kind
== ck_rvalue
6040 || ics2
->kind
== ck_lvalue
)
6041 ics2
= ics2
->u
.next
;
6043 if (ics2
->kind
== ck_user
6044 || ics2
->kind
== ck_ambig
6045 || ics2
->kind
== ck_identity
)
6046 /* At this point, ICS1 cannot be a proper subsequence of
6047 ICS2. We can get a USER_CONV when we are comparing the
6048 second standard conversion sequence of two user conversion
6052 ics2
= ics2
->u
.next
;
6054 if (ics2
->kind
== ics1
->kind
6055 && same_type_p (ics2
->type
, ics1
->type
)
6056 && same_type_p (ics2
->u
.next
->type
,
6057 ics1
->u
.next
->type
))
6062 /* Returns nonzero iff DERIVED is derived from BASE. The inputs may
6063 be any _TYPE nodes. */
6066 is_properly_derived_from (tree derived
, tree base
)
6068 if (!CLASS_TYPE_P (derived
) || !CLASS_TYPE_P (base
))
6071 /* We only allow proper derivation here. The DERIVED_FROM_P macro
6072 considers every class derived from itself. */
6073 return (!same_type_ignoring_top_level_qualifiers_p (derived
, base
)
6074 && DERIVED_FROM_P (base
, derived
));
6077 /* We build the ICS for an implicit object parameter as a pointer
6078 conversion sequence. However, such a sequence should be compared
6079 as if it were a reference conversion sequence. If ICS is the
6080 implicit conversion sequence for an implicit object parameter,
6081 modify it accordingly. */
6084 maybe_handle_implicit_object (conversion
**ics
)
6088 /* [over.match.funcs]
6090 For non-static member functions, the type of the
6091 implicit object parameter is "reference to cv X"
6092 where X is the class of which the function is a
6093 member and cv is the cv-qualification on the member
6094 function declaration. */
6095 conversion
*t
= *ics
;
6096 tree reference_type
;
6098 /* The `this' parameter is a pointer to a class type. Make the
6099 implicit conversion talk about a reference to that same class
6101 reference_type
= TREE_TYPE (t
->type
);
6102 reference_type
= build_reference_type (reference_type
);
6104 if (t
->kind
== ck_qual
)
6106 if (t
->kind
== ck_ptr
)
6108 t
= build_identity_conv (TREE_TYPE (t
->type
), NULL_TREE
);
6109 t
= direct_reference_binding (reference_type
, t
);
6111 t
->rvaluedness_matches_p
= 0;
6116 /* If *ICS is a REF_BIND set *ICS to the remainder of the conversion,
6117 and return the initial reference binding conversion. Otherwise,
6118 leave *ICS unchanged and return NULL. */
6121 maybe_handle_ref_bind (conversion
**ics
)
6123 if ((*ics
)->kind
== ck_ref_bind
)
6125 conversion
*old_ics
= *ics
;
6126 *ics
= old_ics
->u
.next
;
6127 (*ics
)->user_conv_p
= old_ics
->user_conv_p
;
6128 (*ics
)->bad_p
= old_ics
->bad_p
;
6135 /* Compare two implicit conversion sequences according to the rules set out in
6136 [over.ics.rank]. Return values:
6138 1: ics1 is better than ics2
6139 -1: ics2 is better than ics1
6140 0: ics1 and ics2 are indistinguishable */
6143 compare_ics (conversion
*ics1
, conversion
*ics2
)
6149 tree deref_from_type1
= NULL_TREE
;
6150 tree deref_from_type2
= NULL_TREE
;
6151 tree deref_to_type1
= NULL_TREE
;
6152 tree deref_to_type2
= NULL_TREE
;
6153 conversion_rank rank1
, rank2
;
6155 /* REF_BINDING is nonzero if the result of the conversion sequence
6156 is a reference type. In that case REF_CONV is the reference
6157 binding conversion. */
6158 conversion
*ref_conv1
;
6159 conversion
*ref_conv2
;
6161 /* Handle implicit object parameters. */
6162 maybe_handle_implicit_object (&ics1
);
6163 maybe_handle_implicit_object (&ics2
);
6165 /* Handle reference parameters. */
6166 ref_conv1
= maybe_handle_ref_bind (&ics1
);
6167 ref_conv2
= maybe_handle_ref_bind (&ics2
);
6171 When comparing the basic forms of implicit conversion sequences (as
6172 defined in _over.best.ics_)
6174 --a standard conversion sequence (_over.ics.scs_) is a better
6175 conversion sequence than a user-defined conversion sequence
6176 or an ellipsis conversion sequence, and
6178 --a user-defined conversion sequence (_over.ics.user_) is a
6179 better conversion sequence than an ellipsis conversion sequence
6180 (_over.ics.ellipsis_). */
6181 rank1
= CONVERSION_RANK (ics1
);
6182 rank2
= CONVERSION_RANK (ics2
);
6186 else if (rank1
< rank2
)
6189 if (rank1
== cr_bad
)
6191 /* XXX Isn't this an extension? */
6192 /* Both ICS are bad. We try to make a decision based on what
6193 would have happened if they'd been good. */
6194 if (ics1
->user_conv_p
> ics2
->user_conv_p
6195 || ics1
->rank
> ics2
->rank
)
6197 else if (ics1
->user_conv_p
< ics2
->user_conv_p
6198 || ics1
->rank
< ics2
->rank
)
6201 /* We couldn't make up our minds; try to figure it out below. */
6204 if (ics1
->ellipsis_p
)
6205 /* Both conversions are ellipsis conversions. */
6208 /* User-defined conversion sequence U1 is a better conversion sequence
6209 than another user-defined conversion sequence U2 if they contain the
6210 same user-defined conversion operator or constructor and if the sec-
6211 ond standard conversion sequence of U1 is better than the second
6212 standard conversion sequence of U2. */
6214 if (ics1
->user_conv_p
)
6219 for (t1
= ics1
; t1
->kind
!= ck_user
&& t1
->kind
!= ck_list
; t1
= t1
->u
.next
)
6220 if (t1
->kind
== ck_ambig
|| t1
->kind
== ck_aggr
)
6222 for (t2
= ics2
; t2
->kind
!= ck_user
&& t2
->kind
!= ck_list
; t2
= t2
->u
.next
)
6223 if (t2
->kind
== ck_ambig
|| t2
->kind
== ck_aggr
)
6226 /* Conversion to std::initializer_list is better than other
6227 user-defined conversions. */
6228 if (t1
->kind
== ck_list
6229 || t2
->kind
== ck_list
)
6231 if (t2
->kind
!= ck_list
)
6233 else if (t1
->kind
!= ck_list
)
6239 if (t1
->cand
->fn
!= t2
->cand
->fn
)
6242 /* We can just fall through here, after setting up
6243 FROM_TYPE1 and FROM_TYPE2. */
6244 from_type1
= t1
->type
;
6245 from_type2
= t2
->type
;
6252 /* We're dealing with two standard conversion sequences.
6256 Standard conversion sequence S1 is a better conversion
6257 sequence than standard conversion sequence S2 if
6259 --S1 is a proper subsequence of S2 (comparing the conversion
6260 sequences in the canonical form defined by _over.ics.scs_,
6261 excluding any Lvalue Transformation; the identity
6262 conversion sequence is considered to be a subsequence of
6263 any non-identity conversion sequence */
6266 while (t1
->kind
!= ck_identity
)
6268 from_type1
= t1
->type
;
6271 while (t2
->kind
!= ck_identity
)
6273 from_type2
= t2
->type
;
6276 /* One sequence can only be a subsequence of the other if they start with
6277 the same type. They can start with different types when comparing the
6278 second standard conversion sequence in two user-defined conversion
6280 if (same_type_p (from_type1
, from_type2
))
6282 if (is_subseq (ics1
, ics2
))
6284 if (is_subseq (ics2
, ics1
))
6292 --the rank of S1 is better than the rank of S2 (by the rules
6295 Standard conversion sequences are ordered by their ranks: an Exact
6296 Match is a better conversion than a Promotion, which is a better
6297 conversion than a Conversion.
6299 Two conversion sequences with the same rank are indistinguishable
6300 unless one of the following rules applies:
6302 --A conversion that is not a conversion of a pointer, or pointer
6303 to member, to bool is better than another conversion that is such
6306 The ICS_STD_RANK automatically handles the pointer-to-bool rule,
6307 so that we do not have to check it explicitly. */
6308 if (ics1
->rank
< ics2
->rank
)
6310 else if (ics2
->rank
< ics1
->rank
)
6313 to_type1
= ics1
->type
;
6314 to_type2
= ics2
->type
;
6316 /* A conversion from scalar arithmetic type to complex is worse than a
6317 conversion between scalar arithmetic types. */
6318 if (same_type_p (from_type1
, from_type2
)
6319 && ARITHMETIC_TYPE_P (from_type1
)
6320 && ARITHMETIC_TYPE_P (to_type1
)
6321 && ARITHMETIC_TYPE_P (to_type2
)
6322 && ((TREE_CODE (to_type1
) == COMPLEX_TYPE
)
6323 != (TREE_CODE (to_type2
) == COMPLEX_TYPE
)))
6325 if (TREE_CODE (to_type1
) == COMPLEX_TYPE
)
6331 if (TYPE_PTR_P (from_type1
)
6332 && TYPE_PTR_P (from_type2
)
6333 && TYPE_PTR_P (to_type1
)
6334 && TYPE_PTR_P (to_type2
))
6336 deref_from_type1
= TREE_TYPE (from_type1
);
6337 deref_from_type2
= TREE_TYPE (from_type2
);
6338 deref_to_type1
= TREE_TYPE (to_type1
);
6339 deref_to_type2
= TREE_TYPE (to_type2
);
6341 /* The rules for pointers to members A::* are just like the rules
6342 for pointers A*, except opposite: if B is derived from A then
6343 A::* converts to B::*, not vice versa. For that reason, we
6344 switch the from_ and to_ variables here. */
6345 else if ((TYPE_PTRMEM_P (from_type1
) && TYPE_PTRMEM_P (from_type2
)
6346 && TYPE_PTRMEM_P (to_type1
) && TYPE_PTRMEM_P (to_type2
))
6347 || (TYPE_PTRMEMFUNC_P (from_type1
)
6348 && TYPE_PTRMEMFUNC_P (from_type2
)
6349 && TYPE_PTRMEMFUNC_P (to_type1
)
6350 && TYPE_PTRMEMFUNC_P (to_type2
)))
6352 deref_to_type1
= TYPE_PTRMEM_CLASS_TYPE (from_type1
);
6353 deref_to_type2
= TYPE_PTRMEM_CLASS_TYPE (from_type2
);
6354 deref_from_type1
= TYPE_PTRMEM_CLASS_TYPE (to_type1
);
6355 deref_from_type2
= TYPE_PTRMEM_CLASS_TYPE (to_type2
);
6358 if (deref_from_type1
!= NULL_TREE
6359 && RECORD_OR_UNION_CODE_P (TREE_CODE (deref_from_type1
))
6360 && RECORD_OR_UNION_CODE_P (TREE_CODE (deref_from_type2
)))
6362 /* This was one of the pointer or pointer-like conversions.
6366 --If class B is derived directly or indirectly from class A,
6367 conversion of B* to A* is better than conversion of B* to
6368 void*, and conversion of A* to void* is better than
6369 conversion of B* to void*. */
6370 if (TREE_CODE (deref_to_type1
) == VOID_TYPE
6371 && TREE_CODE (deref_to_type2
) == VOID_TYPE
)
6373 if (is_properly_derived_from (deref_from_type1
,
6376 else if (is_properly_derived_from (deref_from_type2
,
6380 else if (TREE_CODE (deref_to_type1
) == VOID_TYPE
6381 || TREE_CODE (deref_to_type2
) == VOID_TYPE
)
6383 if (same_type_p (deref_from_type1
, deref_from_type2
))
6385 if (TREE_CODE (deref_to_type2
) == VOID_TYPE
)
6387 if (is_properly_derived_from (deref_from_type1
,
6391 /* We know that DEREF_TO_TYPE1 is `void' here. */
6392 else if (is_properly_derived_from (deref_from_type1
,
6397 else if (RECORD_OR_UNION_CODE_P (TREE_CODE (deref_to_type1
))
6398 && RECORD_OR_UNION_CODE_P (TREE_CODE (deref_to_type2
)))
6402 --If class B is derived directly or indirectly from class A
6403 and class C is derived directly or indirectly from B,
6405 --conversion of C* to B* is better than conversion of C* to
6408 --conversion of B* to A* is better than conversion of C* to
6410 if (same_type_p (deref_from_type1
, deref_from_type2
))
6412 if (is_properly_derived_from (deref_to_type1
,
6415 else if (is_properly_derived_from (deref_to_type2
,
6419 else if (same_type_p (deref_to_type1
, deref_to_type2
))
6421 if (is_properly_derived_from (deref_from_type2
,
6424 else if (is_properly_derived_from (deref_from_type1
,
6430 else if (CLASS_TYPE_P (non_reference (from_type1
))
6431 && same_type_p (from_type1
, from_type2
))
6433 tree from
= non_reference (from_type1
);
6437 --binding of an expression of type C to a reference of type
6438 B& is better than binding an expression of type C to a
6439 reference of type A&
6441 --conversion of C to B is better than conversion of C to A, */
6442 if (is_properly_derived_from (from
, to_type1
)
6443 && is_properly_derived_from (from
, to_type2
))
6445 if (is_properly_derived_from (to_type1
, to_type2
))
6447 else if (is_properly_derived_from (to_type2
, to_type1
))
6451 else if (CLASS_TYPE_P (non_reference (to_type1
))
6452 && same_type_p (to_type1
, to_type2
))
6454 tree to
= non_reference (to_type1
);
6458 --binding of an expression of type B to a reference of type
6459 A& is better than binding an expression of type C to a
6460 reference of type A&,
6462 --conversion of B to A is better than conversion of C to A */
6463 if (is_properly_derived_from (from_type1
, to
)
6464 && is_properly_derived_from (from_type2
, to
))
6466 if (is_properly_derived_from (from_type2
, from_type1
))
6468 else if (is_properly_derived_from (from_type1
, from_type2
))
6475 --S1 and S2 differ only in their qualification conversion and yield
6476 similar types T1 and T2 (_conv.qual_), respectively, and the cv-
6477 qualification signature of type T1 is a proper subset of the cv-
6478 qualification signature of type T2 */
6479 if (ics1
->kind
== ck_qual
6480 && ics2
->kind
== ck_qual
6481 && same_type_p (from_type1
, from_type2
))
6483 int result
= comp_cv_qual_signature (to_type1
, to_type2
);
6490 --S1 and S2 are reference bindings (_dcl.init.ref_) and neither refers
6491 to an implicit object parameter, and either S1 binds an lvalue reference
6492 to an lvalue and S2 binds an rvalue reference or S1 binds an rvalue
6493 reference to an rvalue and S2 binds an lvalue reference
6494 (C++0x draft standard, 13.3.3.2)
6496 --S1 and S2 are reference bindings (_dcl.init.ref_), and the
6497 types to which the references refer are the same type except for
6498 top-level cv-qualifiers, and the type to which the reference
6499 initialized by S2 refers is more cv-qualified than the type to
6500 which the reference initialized by S1 refers */
6502 if (ref_conv1
&& ref_conv2
)
6504 if (!ref_conv1
->this_p
&& !ref_conv2
->this_p
6505 && (TYPE_REF_IS_RVALUE (ref_conv1
->type
)
6506 != TYPE_REF_IS_RVALUE (ref_conv2
->type
)))
6508 if (ref_conv1
->rvaluedness_matches_p
)
6510 if (ref_conv2
->rvaluedness_matches_p
)
6514 if (same_type_ignoring_top_level_qualifiers_p (to_type1
, to_type2
))
6515 return comp_cv_qualification (TREE_TYPE (ref_conv2
->type
),
6516 TREE_TYPE (ref_conv1
->type
));
6519 /* Neither conversion sequence is better than the other. */
6523 /* The source type for this standard conversion sequence. */
6526 source_type (conversion
*t
)
6528 for (;; t
= t
->u
.next
)
6530 if (t
->kind
== ck_user
6531 || t
->kind
== ck_ambig
6532 || t
->kind
== ck_identity
)
6538 /* Note a warning about preferring WINNER to LOSER. We do this by storing
6539 a pointer to LOSER and re-running joust to produce the warning if WINNER
6540 is actually used. */
6543 add_warning (struct z_candidate
*winner
, struct z_candidate
*loser
)
6545 candidate_warning
*cw
= (candidate_warning
*)
6546 conversion_obstack_alloc (sizeof (candidate_warning
));
6548 cw
->next
= winner
->warnings
;
6549 winner
->warnings
= cw
;
6552 /* Compare two candidates for overloading as described in
6553 [over.match.best]. Return values:
6555 1: cand1 is better than cand2
6556 -1: cand2 is better than cand1
6557 0: cand1 and cand2 are indistinguishable */
6560 joust (struct z_candidate
*cand1
, struct z_candidate
*cand2
, bool warn
)
6563 int off1
= 0, off2
= 0;
6567 /* Candidates that involve bad conversions are always worse than those
6569 if (cand1
->viable
> cand2
->viable
)
6571 if (cand1
->viable
< cand2
->viable
)
6574 /* If we have two pseudo-candidates for conversions to the same type,
6575 or two candidates for the same function, arbitrarily pick one. */
6576 if (cand1
->fn
== cand2
->fn
6577 && (IS_TYPE_OR_DECL_P (cand1
->fn
)))
6580 /* a viable function F1
6581 is defined to be a better function than another viable function F2 if
6582 for all arguments i, ICSi(F1) is not a worse conversion sequence than
6583 ICSi(F2), and then */
6585 /* for some argument j, ICSj(F1) is a better conversion sequence than
6588 /* For comparing static and non-static member functions, we ignore
6589 the implicit object parameter of the non-static function. The
6590 standard says to pretend that the static function has an object
6591 parm, but that won't work with operator overloading. */
6592 len
= cand1
->num_convs
;
6593 if (len
!= cand2
->num_convs
)
6595 int static_1
= DECL_STATIC_FUNCTION_P (cand1
->fn
);
6596 int static_2
= DECL_STATIC_FUNCTION_P (cand2
->fn
);
6598 gcc_assert (static_1
!= static_2
);
6609 for (i
= 0; i
< len
; ++i
)
6611 conversion
*t1
= cand1
->convs
[i
+ off1
];
6612 conversion
*t2
= cand2
->convs
[i
+ off2
];
6613 int comp
= compare_ics (t1
, t2
);
6618 && (CONVERSION_RANK (t1
) + CONVERSION_RANK (t2
)
6619 == cr_std
+ cr_promotion
)
6620 && t1
->kind
== ck_std
6621 && t2
->kind
== ck_std
6622 && TREE_CODE (t1
->type
) == INTEGER_TYPE
6623 && TREE_CODE (t2
->type
) == INTEGER_TYPE
6624 && (TYPE_PRECISION (t1
->type
)
6625 == TYPE_PRECISION (t2
->type
))
6626 && (TYPE_UNSIGNED (t1
->u
.next
->type
)
6627 || (TREE_CODE (t1
->u
.next
->type
)
6630 tree type
= t1
->u
.next
->type
;
6632 struct z_candidate
*w
, *l
;
6634 type1
= t1
->type
, type2
= t2
->type
,
6635 w
= cand1
, l
= cand2
;
6637 type1
= t2
->type
, type2
= t1
->type
,
6638 w
= cand2
, l
= cand1
;
6642 warning (OPT_Wsign_promo
, "passing %qT chooses %qT over %qT",
6643 type
, type1
, type2
);
6644 warning (OPT_Wsign_promo
, " in call to %qD", w
->fn
);
6650 if (winner
&& comp
!= winner
)
6659 /* warn about confusing overload resolution for user-defined conversions,
6660 either between a constructor and a conversion op, or between two
6662 if (winner
&& warn_conversion
&& cand1
->second_conv
6663 && (!DECL_CONSTRUCTOR_P (cand1
->fn
) || !DECL_CONSTRUCTOR_P (cand2
->fn
))
6664 && winner
!= compare_ics (cand1
->second_conv
, cand2
->second_conv
))
6666 struct z_candidate
*w
, *l
;
6667 bool give_warning
= false;
6670 w
= cand1
, l
= cand2
;
6672 w
= cand2
, l
= cand1
;
6674 /* We don't want to complain about `X::operator T1 ()'
6675 beating `X::operator T2 () const', when T2 is a no less
6676 cv-qualified version of T1. */
6677 if (DECL_CONTEXT (w
->fn
) == DECL_CONTEXT (l
->fn
)
6678 && !DECL_CONSTRUCTOR_P (w
->fn
) && !DECL_CONSTRUCTOR_P (l
->fn
))
6680 tree t
= TREE_TYPE (TREE_TYPE (l
->fn
));
6681 tree f
= TREE_TYPE (TREE_TYPE (w
->fn
));
6683 if (TREE_CODE (t
) == TREE_CODE (f
) && POINTER_TYPE_P (t
))
6688 if (!comp_ptr_ttypes (t
, f
))
6689 give_warning
= true;
6692 give_warning
= true;
6698 tree source
= source_type (w
->convs
[0]);
6699 if (! DECL_CONSTRUCTOR_P (w
->fn
))
6700 source
= TREE_TYPE (source
);
6701 if (warning (OPT_Wconversion
, "choosing %qD over %qD", w
->fn
, l
->fn
)
6702 && warning (OPT_Wconversion
, " for conversion from %qT to %qT",
6703 source
, w
->second_conv
->type
))
6705 inform (input_location
, " because conversion sequence for the argument is better");
6716 F1 is a non-template function and F2 is a template function
6719 if (!cand1
->template_decl
&& cand2
->template_decl
)
6721 else if (cand1
->template_decl
&& !cand2
->template_decl
)
6725 F1 and F2 are template functions and the function template for F1 is
6726 more specialized than the template for F2 according to the partial
6729 if (cand1
->template_decl
&& cand2
->template_decl
)
6731 winner
= more_specialized_fn
6732 (TI_TEMPLATE (cand1
->template_decl
),
6733 TI_TEMPLATE (cand2
->template_decl
),
6734 /* [temp.func.order]: The presence of unused ellipsis and default
6735 arguments has no effect on the partial ordering of function
6736 templates. add_function_candidate() will not have
6737 counted the "this" argument for constructors. */
6738 cand1
->num_convs
+ DECL_CONSTRUCTOR_P (cand1
->fn
));
6744 the context is an initialization by user-defined conversion (see
6745 _dcl.init_ and _over.match.user_) and the standard conversion
6746 sequence from the return type of F1 to the destination type (i.e.,
6747 the type of the entity being initialized) is a better conversion
6748 sequence than the standard conversion sequence from the return type
6749 of F2 to the destination type. */
6751 if (cand1
->second_conv
)
6753 winner
= compare_ics (cand1
->second_conv
, cand2
->second_conv
);
6758 /* Check whether we can discard a builtin candidate, either because we
6759 have two identical ones or matching builtin and non-builtin candidates.
6761 (Pedantically in the latter case the builtin which matched the user
6762 function should not be added to the overload set, but we spot it here.
6765 ... the builtin candidates include ...
6766 - do not have the same parameter type list as any non-template
6767 non-member candidate. */
6769 if (TREE_CODE (cand1
->fn
) == IDENTIFIER_NODE
6770 || TREE_CODE (cand2
->fn
) == IDENTIFIER_NODE
)
6772 for (i
= 0; i
< len
; ++i
)
6773 if (!same_type_p (cand1
->convs
[i
]->type
,
6774 cand2
->convs
[i
]->type
))
6776 if (i
== cand1
->num_convs
)
6778 if (cand1
->fn
== cand2
->fn
)
6779 /* Two built-in candidates; arbitrarily pick one. */
6781 else if (TREE_CODE (cand1
->fn
) == IDENTIFIER_NODE
)
6782 /* cand1 is built-in; prefer cand2. */
6785 /* cand2 is built-in; prefer cand1. */
6790 /* If the two functions are the same (this can happen with declarations
6791 in multiple scopes and arg-dependent lookup), arbitrarily choose one. */
6792 if (DECL_P (cand1
->fn
) && DECL_P (cand2
->fn
)
6793 && equal_functions (cand1
->fn
, cand2
->fn
))
6798 /* Extension: If the worst conversion for one candidate is worse than the
6799 worst conversion for the other, take the first. */
6802 conversion_rank rank1
= cr_identity
, rank2
= cr_identity
;
6803 struct z_candidate
*w
= 0, *l
= 0;
6805 for (i
= 0; i
< len
; ++i
)
6807 if (CONVERSION_RANK (cand1
->convs
[i
+off1
]) > rank1
)
6808 rank1
= CONVERSION_RANK (cand1
->convs
[i
+off1
]);
6809 if (CONVERSION_RANK (cand2
->convs
[i
+ off2
]) > rank2
)
6810 rank2
= CONVERSION_RANK (cand2
->convs
[i
+ off2
]);
6813 winner
= 1, w
= cand1
, l
= cand2
;
6815 winner
= -1, w
= cand2
, l
= cand1
;
6820 pedwarn (input_location
, 0,
6821 "ISO C++ says that these are ambiguous, even "
6822 "though the worst conversion for the first is better than "
6823 "the worst conversion for the second:");
6824 print_z_candidate (_("candidate 1:"), w
);
6825 print_z_candidate (_("candidate 2:"), l
);
6833 gcc_assert (!winner
);
6837 /* Given a list of candidates for overloading, find the best one, if any.
6838 This algorithm has a worst case of O(2n) (winner is last), and a best
6839 case of O(n/2) (totally ambiguous); much better than a sorting
6842 static struct z_candidate
*
6843 tourney (struct z_candidate
*candidates
)
6845 struct z_candidate
*champ
= candidates
, *challenger
;
6847 int champ_compared_to_predecessor
= 0;
6849 /* Walk through the list once, comparing each current champ to the next
6850 candidate, knocking out a candidate or two with each comparison. */
6852 for (challenger
= champ
->next
; challenger
; )
6854 fate
= joust (champ
, challenger
, 0);
6856 challenger
= challenger
->next
;
6861 champ
= challenger
->next
;
6864 champ_compared_to_predecessor
= 0;
6869 champ_compared_to_predecessor
= 1;
6872 challenger
= champ
->next
;
6876 /* Make sure the champ is better than all the candidates it hasn't yet
6877 been compared to. */
6879 for (challenger
= candidates
;
6881 && !(champ_compared_to_predecessor
&& challenger
->next
== champ
);
6882 challenger
= challenger
->next
)
6884 fate
= joust (champ
, challenger
, 0);
6892 /* Returns nonzero if things of type FROM can be converted to TO. */
6895 can_convert (tree to
, tree from
)
6897 return can_convert_arg (to
, from
, NULL_TREE
, LOOKUP_NORMAL
);
6900 /* Returns nonzero if ARG (of type FROM) can be converted to TO. */
6903 can_convert_arg (tree to
, tree from
, tree arg
, int flags
)
6909 /* Get the high-water mark for the CONVERSION_OBSTACK. */
6910 p
= conversion_obstack_alloc (0);
6912 t
= implicit_conversion (to
, from
, arg
, /*c_cast_p=*/false,
6914 ok_p
= (t
&& !t
->bad_p
);
6916 /* Free all the conversions we allocated. */
6917 obstack_free (&conversion_obstack
, p
);
6922 /* Like can_convert_arg, but allows dubious conversions as well. */
6925 can_convert_arg_bad (tree to
, tree from
, tree arg
)
6930 /* Get the high-water mark for the CONVERSION_OBSTACK. */
6931 p
= conversion_obstack_alloc (0);
6932 /* Try to perform the conversion. */
6933 t
= implicit_conversion (to
, from
, arg
, /*c_cast_p=*/false,
6935 /* Free all the conversions we allocated. */
6936 obstack_free (&conversion_obstack
, p
);
6941 /* Convert EXPR to TYPE. Return the converted expression.
6943 Note that we allow bad conversions here because by the time we get to
6944 this point we are committed to doing the conversion. If we end up
6945 doing a bad conversion, convert_like will complain. */
6948 perform_implicit_conversion (tree type
, tree expr
, tsubst_flags_t complain
)
6953 if (error_operand_p (expr
))
6954 return error_mark_node
;
6956 /* Get the high-water mark for the CONVERSION_OBSTACK. */
6957 p
= conversion_obstack_alloc (0);
6959 conv
= implicit_conversion (type
, TREE_TYPE (expr
), expr
,
6964 if (complain
& tf_error
)
6965 error ("could not convert %qE to %qT", expr
, type
);
6966 expr
= error_mark_node
;
6968 else if (processing_template_decl
)
6970 /* In a template, we are only concerned about determining the
6971 type of non-dependent expressions, so we do not have to
6972 perform the actual conversion. */
6973 if (TREE_TYPE (expr
) != type
)
6974 expr
= build_nop (type
, expr
);
6977 expr
= convert_like (conv
, expr
, complain
);
6979 /* Free all the conversions we allocated. */
6980 obstack_free (&conversion_obstack
, p
);
6985 /* Convert EXPR to TYPE (as a direct-initialization) if that is
6986 permitted. If the conversion is valid, the converted expression is
6987 returned. Otherwise, NULL_TREE is returned, except in the case
6988 that TYPE is a class type; in that case, an error is issued. If
6989 C_CAST_P is true, then this direction initialization is taking
6990 place as part of a static_cast being attempted as part of a C-style
6994 perform_direct_initialization_if_possible (tree type
,
6997 tsubst_flags_t complain
)
7002 if (type
== error_mark_node
|| error_operand_p (expr
))
7003 return error_mark_node
;
7006 If the destination type is a (possibly cv-qualified) class type:
7008 -- If the initialization is direct-initialization ...,
7009 constructors are considered. ... If no constructor applies, or
7010 the overload resolution is ambiguous, the initialization is
7012 if (CLASS_TYPE_P (type
))
7014 expr
= build_special_member_call (NULL_TREE
, complete_ctor_identifier
,
7015 build_tree_list (NULL_TREE
, expr
),
7016 type
, LOOKUP_NORMAL
, complain
);
7017 return build_cplus_new (type
, expr
);
7020 /* Get the high-water mark for the CONVERSION_OBSTACK. */
7021 p
= conversion_obstack_alloc (0);
7023 conv
= implicit_conversion (type
, TREE_TYPE (expr
), expr
,
7026 if (!conv
|| conv
->bad_p
)
7029 expr
= convert_like_real (conv
, expr
, NULL_TREE
, 0, 0,
7030 /*issue_conversion_warnings=*/false,
7032 tf_warning_or_error
);
7034 /* Free all the conversions we allocated. */
7035 obstack_free (&conversion_obstack
, p
);
7040 /* DECL is a VAR_DECL whose type is a REFERENCE_TYPE. The reference
7041 is being bound to a temporary. Create and return a new VAR_DECL
7042 with the indicated TYPE; this variable will store the value to
7043 which the reference is bound. */
7046 make_temporary_var_for_ref_to_temp (tree decl
, tree type
)
7050 /* Create the variable. */
7051 var
= create_temporary_var (type
);
7053 /* Register the variable. */
7054 if (TREE_STATIC (decl
))
7056 /* Namespace-scope or local static; give it a mangled name. */
7059 TREE_STATIC (var
) = 1;
7060 name
= mangle_ref_init_variable (decl
);
7061 DECL_NAME (var
) = name
;
7062 SET_DECL_ASSEMBLER_NAME (var
, name
);
7063 var
= pushdecl_top_level (var
);
7066 /* Create a new cleanup level if necessary. */
7067 maybe_push_cleanup_level (type
);
7072 /* EXPR is the initializer for a variable DECL of reference or
7073 std::initializer_list type. Create, push and return a new VAR_DECL
7074 for the initializer so that it will live as long as DECL. Any
7075 cleanup for the new variable is returned through CLEANUP, and the
7076 code to initialize the new variable is returned through INITP. */
7079 set_up_extended_ref_temp (tree decl
, tree expr
, tree
*cleanup
, tree
*initp
)
7085 /* Create the temporary variable. */
7086 type
= TREE_TYPE (expr
);
7087 var
= make_temporary_var_for_ref_to_temp (decl
, type
);
7088 layout_decl (var
, 0);
7089 /* If the rvalue is the result of a function call it will be
7090 a TARGET_EXPR. If it is some other construct (such as a
7091 member access expression where the underlying object is
7092 itself the result of a function call), turn it into a
7093 TARGET_EXPR here. It is important that EXPR be a
7094 TARGET_EXPR below since otherwise the INIT_EXPR will
7095 attempt to make a bitwise copy of EXPR to initialize
7097 if (TREE_CODE (expr
) != TARGET_EXPR
)
7098 expr
= get_target_expr (expr
);
7099 /* Create the INIT_EXPR that will initialize the temporary
7101 init
= build2 (INIT_EXPR
, type
, var
, expr
);
7102 if (at_function_scope_p ())
7104 add_decl_expr (var
);
7106 if (TREE_STATIC (var
))
7107 init
= add_stmt_to_compound (init
, register_dtor_fn (var
));
7109 *cleanup
= cxx_maybe_build_cleanup (var
);
7111 /* We must be careful to destroy the temporary only
7112 after its initialization has taken place. If the
7113 initialization throws an exception, then the
7114 destructor should not be run. We cannot simply
7115 transform INIT into something like:
7117 (INIT, ({ CLEANUP_STMT; }))
7119 because emit_local_var always treats the
7120 initializer as a full-expression. Thus, the
7121 destructor would run too early; it would run at the
7122 end of initializing the reference variable, rather
7123 than at the end of the block enclosing the
7126 The solution is to pass back a cleanup expression
7127 which the caller is responsible for attaching to
7128 the statement tree. */
7132 rest_of_decl_compilation (var
, /*toplev=*/1, at_eof
);
7133 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type
))
7134 static_aggregates
= tree_cons (NULL_TREE
, var
,
7142 /* Convert EXPR to the indicated reference TYPE, in a way suitable for
7143 initializing a variable of that TYPE. If DECL is non-NULL, it is
7144 the VAR_DECL being initialized with the EXPR. (In that case, the
7145 type of DECL will be TYPE.) If DECL is non-NULL, then CLEANUP must
7146 also be non-NULL, and with *CLEANUP initialized to NULL. Upon
7147 return, if *CLEANUP is no longer NULL, it will be an expression
7148 that should be pushed as a cleanup after the returned expression
7149 is used to initialize DECL.
7151 Return the converted expression. */
7154 initialize_reference (tree type
, tree expr
, tree decl
, tree
*cleanup
)
7159 if (type
== error_mark_node
|| error_operand_p (expr
))
7160 return error_mark_node
;
7162 /* Get the high-water mark for the CONVERSION_OBSTACK. */
7163 p
= conversion_obstack_alloc (0);
7165 conv
= reference_binding (type
, TREE_TYPE (expr
), expr
, /*c_cast_p=*/false,
7167 if (!conv
|| conv
->bad_p
)
7169 if (!(TYPE_QUALS (TREE_TYPE (type
)) & TYPE_QUAL_CONST
)
7170 && !real_lvalue_p (expr
))
7171 error ("invalid initialization of non-const reference of "
7172 "type %qT from a temporary of type %qT",
7173 type
, TREE_TYPE (expr
));
7175 error ("invalid initialization of reference of type "
7176 "%qT from expression of type %qT", type
,
7178 return error_mark_node
;
7181 /* If DECL is non-NULL, then this special rule applies:
7185 The temporary to which the reference is bound or the temporary
7186 that is the complete object to which the reference is bound
7187 persists for the lifetime of the reference.
7189 The temporaries created during the evaluation of the expression
7190 initializing the reference, except the temporary to which the
7191 reference is bound, are destroyed at the end of the
7192 full-expression in which they are created.
7194 In that case, we store the converted expression into a new
7195 VAR_DECL in a new scope.
7197 However, we want to be careful not to create temporaries when
7198 they are not required. For example, given:
7201 struct D : public B {};
7205 there is no need to copy the return value from "f"; we can just
7206 extend its lifetime. Similarly, given:
7209 struct T { operator S(); };
7213 we can extend the lifetime of the return value of the conversion
7215 gcc_assert (conv
->kind
== ck_ref_bind
);
7219 tree base_conv_type
;
7221 /* Skip over the REF_BIND. */
7222 conv
= conv
->u
.next
;
7223 /* If the next conversion is a BASE_CONV, skip that too -- but
7224 remember that the conversion was required. */
7225 if (conv
->kind
== ck_base
)
7227 base_conv_type
= conv
->type
;
7228 conv
= conv
->u
.next
;
7231 base_conv_type
= NULL_TREE
;
7232 /* Perform the remainder of the conversion. */
7233 expr
= convert_like_real (conv
, expr
,
7234 /*fn=*/NULL_TREE
, /*argnum=*/0,
7236 /*issue_conversion_warnings=*/true,
7238 tf_warning_or_error
);
7239 if (error_operand_p (expr
))
7240 expr
= error_mark_node
;
7243 if (!real_lvalue_p (expr
))
7246 var
= set_up_extended_ref_temp (decl
, expr
, cleanup
, &init
);
7247 /* Use its address to initialize the reference variable. */
7248 expr
= build_address (var
);
7250 expr
= convert_to_base (expr
,
7251 build_pointer_type (base_conv_type
),
7252 /*check_access=*/true,
7254 expr
= build2 (COMPOUND_EXPR
, TREE_TYPE (expr
), init
, expr
);
7257 /* Take the address of EXPR. */
7258 expr
= cp_build_unary_op (ADDR_EXPR
, expr
, 0, tf_warning_or_error
);
7259 /* If a BASE_CONV was required, perform it now. */
7261 expr
= (perform_implicit_conversion
7262 (build_pointer_type (base_conv_type
), expr
,
7263 tf_warning_or_error
));
7264 expr
= build_nop (type
, expr
);
7268 /* Perform the conversion. */
7269 expr
= convert_like (conv
, expr
, tf_warning_or_error
);
7271 /* Free all the conversions we allocated. */
7272 obstack_free (&conversion_obstack
, p
);
7277 /* Returns true iff TYPE is some variant of std::initializer_list. */
7280 is_std_init_list (tree type
)
7282 return (CLASS_TYPE_P (type
)
7283 && CP_TYPE_CONTEXT (type
) == std_node
7284 && strcmp (TYPE_NAME_STRING (type
), "initializer_list") == 0);
7287 /* Returns true iff DECL is a list constructor: i.e. a constructor which
7288 will accept an argument list of a single std::initializer_list<T>. */
7291 is_list_ctor (tree decl
)
7293 tree args
= FUNCTION_FIRST_USER_PARMTYPE (decl
);
7296 if (!args
|| args
== void_list_node
)
7299 arg
= non_reference (TREE_VALUE (args
));
7300 if (!is_std_init_list (arg
))
7303 args
= TREE_CHAIN (args
);
7305 if (args
&& args
!= void_list_node
&& !TREE_PURPOSE (args
))
7306 /* There are more non-defaulted parms. */
7312 #include "gt-cp-call.h"