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, 2009
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 VEC(tree,gc) *resolve_args (VEC(tree,gc) *);
149 static struct z_candidate *build_user_type_conversion_1 (tree, tree, int);
150 static void print_z_candidate (const char *, struct z_candidate *);
151 static void print_z_candidates (struct z_candidate *);
152 static tree build_this (tree);
153 static struct z_candidate *splice_viable (struct z_candidate *, bool, bool *);
154 static bool any_strictly_viable (struct z_candidate *);
155 static struct z_candidate *add_template_candidate
156 (struct z_candidate **, tree, tree, tree, tree, const VEC(tree,gc) *,
157 tree, tree, tree, int, unification_kind_t);
158 static struct z_candidate *add_template_candidate_real
159 (struct z_candidate **, tree, tree, tree, tree, const VEC(tree,gc) *,
160 tree, tree, tree, int, tree, unification_kind_t);
161 static struct z_candidate *add_template_conv_candidate
162 (struct z_candidate **, tree, tree, tree, const VEC(tree,gc) *, 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, const VEC(tree,gc) *, tree,
177 static struct z_candidate *add_function_candidate
178 (struct z_candidate **, tree, tree, tree, const VEC(tree,gc) *, tree,
180 static conversion *implicit_conversion (tree, tree, tree, bool, int);
181 static conversion *standard_conversion (tree, tree, tree, bool, int);
182 static conversion *reference_binding (tree, tree, tree, bool, int);
183 static conversion *build_conv (conversion_kind, tree, conversion *);
184 static conversion *build_list_conv (tree, tree, int);
185 static bool is_subseq (conversion *, conversion *);
186 static conversion *maybe_handle_ref_bind (conversion **);
187 static void maybe_handle_implicit_object (conversion **);
188 static struct z_candidate *add_candidate
189 (struct z_candidate **, tree, tree, const VEC(tree,gc) *, size_t,
190 conversion **, tree, tree, int);
191 static tree source_type (conversion *);
192 static void add_warning (struct z_candidate *, struct z_candidate *);
193 static bool reference_compatible_p (tree, tree);
194 static conversion *convert_class_to_reference (tree, tree, tree, int);
195 static conversion *direct_reference_binding (tree, conversion *);
196 static bool promoted_arithmetic_type_p (tree);
197 static conversion *conditional_conversion (tree, tree);
198 static char *name_as_c_string (tree, tree, bool *);
199 static tree prep_operand (tree);
200 static void add_candidates (tree, const VEC(tree,gc) *, 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));
243 if (!name || name == error_mark_node)
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);
316 /* An rvalue has no cv-qualifiers. */
317 if (SCALAR_TYPE_P (result_type) || VOID_TYPE_P (result_type))
318 result_type = cv_unqualified (result_type);
320 if (TREE_CODE (function) == ADDR_EXPR
321 && TREE_CODE (TREE_OPERAND (function, 0)) == FUNCTION_DECL)
323 decl = TREE_OPERAND (function, 0);
324 if (!TREE_USED (decl))
326 /* We invoke build_call directly for several library
327 functions. These may have been declared normally if
328 we're building libgcc, so we can't just check
330 gcc_assert (DECL_ARTIFICIAL (decl)
331 || !strncmp (IDENTIFIER_POINTER (DECL_NAME (decl)),
339 /* We check both the decl and the type; a function may be known not to
340 throw without being declared throw(). */
341 nothrow = ((decl && TREE_NOTHROW (decl))
342 || TYPE_NOTHROW_P (TREE_TYPE (TREE_TYPE (function))));
344 if (decl && TREE_THIS_VOLATILE (decl) && cfun && cp_function_chain)
345 current_function_returns_abnormally = 1;
347 if (decl && TREE_DEPRECATED (decl))
348 warn_deprecated_use (decl, NULL_TREE);
349 require_complete_eh_spec_types (fntype, decl);
351 if (decl && DECL_CONSTRUCTOR_P (decl))
354 /* Don't pass empty class objects by value. This is useful
355 for tags in STL, which are used to control overload resolution.
356 We don't need to handle other cases of copying empty classes. */
357 if (! decl || ! DECL_BUILT_IN (decl))
358 for (i = 0; i < n; i++)
359 if (is_empty_class (TREE_TYPE (argarray[i]))
360 && ! TREE_ADDRESSABLE (TREE_TYPE (argarray[i])))
362 tree t = build0 (EMPTY_CLASS_EXPR, TREE_TYPE (argarray[i]));
363 argarray[i] = build2 (COMPOUND_EXPR, TREE_TYPE (t),
367 function = build_call_array_loc (input_location,
368 result_type, function, n, argarray);
369 TREE_HAS_CONSTRUCTOR (function) = is_constructor;
370 TREE_NOTHROW (function) = nothrow;
375 /* Build something of the form ptr->method (args)
376 or object.method (args). This can also build
377 calls to constructors, and find friends.
379 Member functions always take their class variable
382 INSTANCE is a class instance.
384 NAME is the name of the method desired, usually an IDENTIFIER_NODE.
386 PARMS help to figure out what that NAME really refers to.
388 BASETYPE_PATH, if non-NULL, contains a chain from the type of INSTANCE
389 down to the real instance type to use for access checking. We need this
390 information to get protected accesses correct.
392 FLAGS is the logical disjunction of zero or more LOOKUP_
393 flags. See cp-tree.h for more info.
395 If this is all OK, calls build_function_call with the resolved
398 This function must also handle being called to perform
399 initialization, promotion/coercion of arguments, and
400 instantiation of default parameters.
402 Note that NAME may refer to an instance variable name. If
403 `operator()()' is defined for the type of that field, then we return
406 /* New overloading code. */
408 typedef struct z_candidate z_candidate;
410 typedef struct candidate_warning candidate_warning;
411 struct candidate_warning {
413 candidate_warning *next;
417 /* The FUNCTION_DECL that will be called if this candidate is
418 selected by overload resolution. */
420 /* If not NULL_TREE, the first argument to use when calling this
423 /* The rest of the arguments to use when calling this function. If
424 there are no further arguments this may be NULL or it may be an
426 const VEC(tree,gc) *args;
427 /* The implicit conversion sequences for each of the arguments to
430 /* The number of implicit conversion sequences. */
432 /* If FN is a user-defined conversion, the standard conversion
433 sequence from the type returned by FN to the desired destination
435 conversion *second_conv;
437 /* If FN is a member function, the binfo indicating the path used to
438 qualify the name of FN at the call site. This path is used to
439 determine whether or not FN is accessible if it is selected by
440 overload resolution. The DECL_CONTEXT of FN will always be a
441 (possibly improper) base of this binfo. */
443 /* If FN is a non-static member function, the binfo indicating the
444 subobject to which the `this' pointer should be converted if FN
445 is selected by overload resolution. The type pointed to the by
446 the `this' pointer must correspond to the most derived class
447 indicated by the CONVERSION_PATH. */
448 tree conversion_path;
450 candidate_warning *warnings;
454 /* Returns true iff T is a null pointer constant in the sense of
458 null_ptr_cst_p (tree t)
462 A null pointer constant is an integral constant expression
463 (_expr.const_) rvalue of integer type that evaluates to zero. */
464 t = integral_constant_value (t);
467 if (CP_INTEGRAL_TYPE_P (TREE_TYPE (t)) && integer_zerop (t))
470 if (!TREE_OVERFLOW (t))
476 /* Returns nonzero if PARMLIST consists of only default parms and/or
480 sufficient_parms_p (const_tree parmlist)
482 for (; parmlist && parmlist != void_list_node;
483 parmlist = TREE_CHAIN (parmlist))
484 if (!TREE_PURPOSE (parmlist))
489 /* Allocate N bytes of memory from the conversion obstack. The memory
490 is zeroed before being returned. */
493 conversion_obstack_alloc (size_t n)
496 if (!conversion_obstack_initialized)
498 gcc_obstack_init (&conversion_obstack);
499 conversion_obstack_initialized = true;
501 p = obstack_alloc (&conversion_obstack, n);
506 /* Dynamically allocate a conversion. */
509 alloc_conversion (conversion_kind kind)
512 c = (conversion *) conversion_obstack_alloc (sizeof (conversion));
517 #ifdef ENABLE_CHECKING
519 /* Make sure that all memory on the conversion obstack has been
523 validate_conversion_obstack (void)
525 if (conversion_obstack_initialized)
526 gcc_assert ((obstack_next_free (&conversion_obstack)
527 == obstack_base (&conversion_obstack)));
530 #endif /* ENABLE_CHECKING */
532 /* Dynamically allocate an array of N conversions. */
535 alloc_conversions (size_t n)
537 return (conversion **) conversion_obstack_alloc (n * sizeof (conversion *));
541 build_conv (conversion_kind code, tree type, conversion *from)
544 conversion_rank rank = CONVERSION_RANK (from);
546 /* Note that the caller is responsible for filling in t->cand for
547 user-defined conversions. */
548 t = alloc_conversion (code);
571 t->user_conv_p = (code == ck_user || from->user_conv_p);
572 t->bad_p = from->bad_p;
577 /* Represent a conversion from CTOR, a braced-init-list, to TYPE, a
578 specialization of std::initializer_list<T>, if such a conversion is
582 build_list_conv (tree type, tree ctor, int flags)
584 tree elttype = TREE_VEC_ELT (CLASSTYPE_TI_ARGS (type), 0);
585 unsigned len = CONSTRUCTOR_NELTS (ctor);
586 conversion **subconvs = alloc_conversions (len);
591 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (ctor), i, val)
594 = implicit_conversion (elttype, TREE_TYPE (val), val,
602 t = alloc_conversion (ck_list);
604 t->u.list = subconvs;
607 for (i = 0; i < len; ++i)
609 conversion *sub = subconvs[i];
610 if (sub->rank > t->rank)
612 if (sub->user_conv_p)
613 t->user_conv_p = true;
621 /* Represent a conversion from CTOR, a braced-init-list, to TYPE, an
622 aggregate class, if such a conversion is possible. */
625 build_aggr_conv (tree type, tree ctor, int flags)
627 unsigned HOST_WIDE_INT i = 0;
629 tree field = TYPE_FIELDS (type);
631 for (; field; field = TREE_CHAIN (field), ++i)
633 if (TREE_CODE (field) != FIELD_DECL)
635 if (i < CONSTRUCTOR_NELTS (ctor))
637 constructor_elt *ce = CONSTRUCTOR_ELT (ctor, i);
638 if (!can_convert_arg (TREE_TYPE (field), TREE_TYPE (ce->value),
642 else if (build_value_init (TREE_TYPE (field)) == error_mark_node)
646 c = alloc_conversion (ck_aggr);
649 c->user_conv_p = true;
654 /* Build a representation of the identity conversion from EXPR to
655 itself. The TYPE should match the type of EXPR, if EXPR is non-NULL. */
658 build_identity_conv (tree type, tree expr)
662 c = alloc_conversion (ck_identity);
669 /* Converting from EXPR to TYPE was ambiguous in the sense that there
670 were multiple user-defined conversions to accomplish the job.
671 Build a conversion that indicates that ambiguity. */
674 build_ambiguous_conv (tree type, tree expr)
678 c = alloc_conversion (ck_ambig);
686 strip_top_quals (tree t)
688 if (TREE_CODE (t) == ARRAY_TYPE)
690 return cp_build_qualified_type (t, 0);
693 /* Returns the standard conversion path (see [conv]) from type FROM to type
694 TO, if any. For proper handling of null pointer constants, you must
695 also pass the expression EXPR to convert from. If C_CAST_P is true,
696 this conversion is coming from a C-style cast. */
699 standard_conversion (tree to, tree from, tree expr, bool c_cast_p,
702 enum tree_code fcode, tcode;
704 bool fromref = false;
706 to = non_reference (to);
707 if (TREE_CODE (from) == REFERENCE_TYPE)
710 from = TREE_TYPE (from);
712 to = strip_top_quals (to);
713 from = strip_top_quals (from);
715 if ((TYPE_PTRFN_P (to) || TYPE_PTRMEMFUNC_P (to))
716 && expr && type_unknown_p (expr))
718 tsubst_flags_t tflags = tf_conv;
719 if (!(flags & LOOKUP_PROTECT))
720 tflags |= tf_no_access_control;
721 expr = instantiate_type (to, expr, tflags);
722 if (expr == error_mark_node)
724 from = TREE_TYPE (expr);
727 fcode = TREE_CODE (from);
728 tcode = TREE_CODE (to);
730 conv = build_identity_conv (from, expr);
731 if (fcode == FUNCTION_TYPE || fcode == ARRAY_TYPE)
733 from = type_decays_to (from);
734 fcode = TREE_CODE (from);
735 conv = build_conv (ck_lvalue, from, conv);
737 else if (fromref || (expr && lvalue_p (expr)))
742 bitfield_type = is_bitfield_expr_with_lowered_type (expr);
745 from = strip_top_quals (bitfield_type);
746 fcode = TREE_CODE (from);
749 conv = build_conv (ck_rvalue, from, conv);
752 /* Allow conversion between `__complex__' data types. */
753 if (tcode == COMPLEX_TYPE && fcode == COMPLEX_TYPE)
755 /* The standard conversion sequence to convert FROM to TO is
756 the standard conversion sequence to perform componentwise
758 conversion *part_conv = standard_conversion
759 (TREE_TYPE (to), TREE_TYPE (from), NULL_TREE, c_cast_p, flags);
763 conv = build_conv (part_conv->kind, to, conv);
764 conv->rank = part_conv->rank;
772 if (same_type_p (from, to))
775 if ((tcode == POINTER_TYPE || TYPE_PTR_TO_MEMBER_P (to))
776 && expr && null_ptr_cst_p (expr))
777 conv = build_conv (ck_std, to, conv);
778 else if ((tcode == INTEGER_TYPE && fcode == POINTER_TYPE)
779 || (tcode == POINTER_TYPE && fcode == INTEGER_TYPE))
781 /* For backwards brain damage compatibility, allow interconversion of
782 pointers and integers with a pedwarn. */
783 conv = build_conv (ck_std, to, conv);
786 else if (UNSCOPED_ENUM_P (to) && fcode == INTEGER_TYPE)
788 /* For backwards brain damage compatibility, allow interconversion of
789 enums and integers with a pedwarn. */
790 conv = build_conv (ck_std, to, conv);
793 else if ((tcode == POINTER_TYPE && fcode == POINTER_TYPE)
794 || (TYPE_PTRMEM_P (to) && TYPE_PTRMEM_P (from)))
799 if (tcode == POINTER_TYPE
800 && same_type_ignoring_top_level_qualifiers_p (TREE_TYPE (from),
803 else if (VOID_TYPE_P (TREE_TYPE (to))
804 && !TYPE_PTRMEM_P (from)
805 && TREE_CODE (TREE_TYPE (from)) != FUNCTION_TYPE)
807 from = build_pointer_type
808 (cp_build_qualified_type (void_type_node,
809 cp_type_quals (TREE_TYPE (from))));
810 conv = build_conv (ck_ptr, from, conv);
812 else if (TYPE_PTRMEM_P (from))
814 tree fbase = TYPE_PTRMEM_CLASS_TYPE (from);
815 tree tbase = TYPE_PTRMEM_CLASS_TYPE (to);
817 if (DERIVED_FROM_P (fbase, tbase)
818 && (same_type_ignoring_top_level_qualifiers_p
819 (TYPE_PTRMEM_POINTED_TO_TYPE (from),
820 TYPE_PTRMEM_POINTED_TO_TYPE (to))))
822 from = build_ptrmem_type (tbase,
823 TYPE_PTRMEM_POINTED_TO_TYPE (from));
824 conv = build_conv (ck_pmem, from, conv);
826 else if (!same_type_p (fbase, tbase))
829 else if (CLASS_TYPE_P (TREE_TYPE (from))
830 && CLASS_TYPE_P (TREE_TYPE (to))
833 An rvalue of type "pointer to cv D," where D is a
834 class type, can be converted to an rvalue of type
835 "pointer to cv B," where B is a base class (clause
836 _class.derived_) of D. If B is an inaccessible
837 (clause _class.access_) or ambiguous
838 (_class.member.lookup_) base class of D, a program
839 that necessitates this conversion is ill-formed.
840 Therefore, we use DERIVED_FROM_P, and do not check
841 access or uniqueness. */
842 && DERIVED_FROM_P (TREE_TYPE (to), TREE_TYPE (from)))
845 cp_build_qualified_type (TREE_TYPE (to),
846 cp_type_quals (TREE_TYPE (from)));
847 from = build_pointer_type (from);
848 conv = build_conv (ck_ptr, from, conv);
852 if (tcode == POINTER_TYPE)
854 to_pointee = TREE_TYPE (to);
855 from_pointee = TREE_TYPE (from);
859 to_pointee = TYPE_PTRMEM_POINTED_TO_TYPE (to);
860 from_pointee = TYPE_PTRMEM_POINTED_TO_TYPE (from);
863 if (same_type_p (from, to))
865 else if (c_cast_p && comp_ptr_ttypes_const (to, from))
866 /* In a C-style cast, we ignore CV-qualification because we
867 are allowed to perform a static_cast followed by a
869 conv = build_conv (ck_qual, to, conv);
870 else if (!c_cast_p && comp_ptr_ttypes (to_pointee, from_pointee))
871 conv = build_conv (ck_qual, to, conv);
872 else if (expr && string_conv_p (to, expr, 0))
873 /* converting from string constant to char *. */
874 conv = build_conv (ck_qual, to, conv);
875 else if (ptr_reasonably_similar (to_pointee, from_pointee))
877 conv = build_conv (ck_ptr, to, conv);
885 else if (TYPE_PTRMEMFUNC_P (to) && TYPE_PTRMEMFUNC_P (from))
887 tree fromfn = TREE_TYPE (TYPE_PTRMEMFUNC_FN_TYPE (from));
888 tree tofn = TREE_TYPE (TYPE_PTRMEMFUNC_FN_TYPE (to));
889 tree fbase = TREE_TYPE (TREE_VALUE (TYPE_ARG_TYPES (fromfn)));
890 tree tbase = TREE_TYPE (TREE_VALUE (TYPE_ARG_TYPES (tofn)));
892 if (!DERIVED_FROM_P (fbase, tbase)
893 || !same_type_p (TREE_TYPE (fromfn), TREE_TYPE (tofn))
894 || !compparms (TREE_CHAIN (TYPE_ARG_TYPES (fromfn)),
895 TREE_CHAIN (TYPE_ARG_TYPES (tofn)))
896 || cp_type_quals (fbase) != cp_type_quals (tbase))
899 from = build_memfn_type (fromfn, tbase, cp_type_quals (tbase));
900 from = build_ptrmemfunc_type (build_pointer_type (from));
901 conv = build_conv (ck_pmem, from, conv);
904 else if (tcode == BOOLEAN_TYPE)
908 An rvalue of arithmetic, unscoped enumeration, pointer, or
909 pointer to member type can be converted to an rvalue of type
911 if (ARITHMETIC_TYPE_P (from)
912 || UNSCOPED_ENUM_P (from)
913 || fcode == POINTER_TYPE
914 || TYPE_PTR_TO_MEMBER_P (from))
916 conv = build_conv (ck_std, to, conv);
917 if (fcode == POINTER_TYPE
918 || TYPE_PTRMEM_P (from)
919 || (TYPE_PTRMEMFUNC_P (from)
920 && conv->rank < cr_pbool))
921 conv->rank = cr_pbool;
927 /* We don't check for ENUMERAL_TYPE here because there are no standard
928 conversions to enum type. */
929 /* As an extension, allow conversion to complex type. */
930 else if (ARITHMETIC_TYPE_P (to))
932 if (! (INTEGRAL_CODE_P (fcode) || fcode == REAL_TYPE)
933 || SCOPED_ENUM_P (from))
935 conv = build_conv (ck_std, to, conv);
937 /* Give this a better rank if it's a promotion. */
938 if (same_type_p (to, type_promotes_to (from))
939 && conv->u.next->rank <= cr_promotion)
940 conv->rank = cr_promotion;
942 else if (fcode == VECTOR_TYPE && tcode == VECTOR_TYPE
943 && vector_types_convertible_p (from, to, false))
944 return build_conv (ck_std, to, conv);
945 else if (MAYBE_CLASS_TYPE_P (to) && MAYBE_CLASS_TYPE_P (from)
946 && is_properly_derived_from (from, to))
948 if (conv->kind == ck_rvalue)
950 conv = build_conv (ck_base, to, conv);
951 /* The derived-to-base conversion indicates the initialization
952 of a parameter with base type from an object of a derived
953 type. A temporary object is created to hold the result of
954 the conversion unless we're binding directly to a reference. */
955 conv->need_temporary_p = !(flags & LOOKUP_NO_TEMP_BIND);
960 if (flags & LOOKUP_NO_NARROWING)
961 conv->check_narrowing = true;
966 /* Returns nonzero if T1 is reference-related to T2. */
969 reference_related_p (tree t1, tree t2)
971 t1 = TYPE_MAIN_VARIANT (t1);
972 t2 = TYPE_MAIN_VARIANT (t2);
976 Given types "cv1 T1" and "cv2 T2," "cv1 T1" is reference-related
977 to "cv2 T2" if T1 is the same type as T2, or T1 is a base class
979 return (same_type_p (t1, t2)
980 || (CLASS_TYPE_P (t1) && CLASS_TYPE_P (t2)
981 && DERIVED_FROM_P (t1, t2)));
984 /* Returns nonzero if T1 is reference-compatible with T2. */
987 reference_compatible_p (tree t1, tree t2)
991 "cv1 T1" is reference compatible with "cv2 T2" if T1 is
992 reference-related to T2 and cv1 is the same cv-qualification as,
993 or greater cv-qualification than, cv2. */
994 return (reference_related_p (t1, t2)
995 && at_least_as_qualified_p (t1, t2));
998 /* Determine whether or not the EXPR (of class type S) can be
999 converted to T as in [over.match.ref]. */
1002 convert_class_to_reference (tree reference_type, tree s, tree expr, int flags)
1008 struct z_candidate *candidates;
1009 struct z_candidate *cand;
1012 conversions = lookup_conversions (s);
1018 Assuming that "cv1 T" is the underlying type of the reference
1019 being initialized, and "cv S" is the type of the initializer
1020 expression, with S a class type, the candidate functions are
1021 selected as follows:
1023 --The conversion functions of S and its base classes are
1024 considered. Those that are not hidden within S and yield type
1025 "reference to cv2 T2", where "cv1 T" is reference-compatible
1026 (_dcl.init.ref_) with "cv2 T2", are candidate functions.
1028 The argument list has one argument, which is the initializer
1033 /* Conceptually, we should take the address of EXPR and put it in
1034 the argument list. Unfortunately, however, that can result in
1035 error messages, which we should not issue now because we are just
1036 trying to find a conversion operator. Therefore, we use NULL,
1037 cast to the appropriate type. */
1038 first_arg = build_int_cst (build_pointer_type (s), 0);
1040 t = TREE_TYPE (reference_type);
1042 for (; conversions; conversions = TREE_CHAIN (conversions))
1044 tree fns = TREE_VALUE (conversions);
1046 for (; fns; fns = OVL_NEXT (fns))
1048 tree f = OVL_CURRENT (fns);
1049 tree t2 = TREE_TYPE (TREE_TYPE (f));
1051 if (DECL_NONCONVERTING_P (f)
1052 && (flags & LOOKUP_ONLYCONVERTING))
1057 /* If this is a template function, try to get an exact
1059 if (TREE_CODE (f) == TEMPLATE_DECL)
1061 cand = add_template_candidate (&candidates,
1068 TREE_PURPOSE (conversions),
1074 /* Now, see if the conversion function really returns
1075 an lvalue of the appropriate type. From the
1076 point of view of unification, simply returning an
1077 rvalue of the right type is good enough. */
1079 t2 = TREE_TYPE (TREE_TYPE (f));
1080 if (TREE_CODE (t2) != REFERENCE_TYPE
1081 || !reference_compatible_p (t, TREE_TYPE (t2)))
1083 candidates = candidates->next;
1088 else if (TREE_CODE (t2) == REFERENCE_TYPE
1089 && reference_compatible_p (t, TREE_TYPE (t2)))
1090 cand = add_function_candidate (&candidates, f, s, first_arg,
1091 NULL, TYPE_BINFO (s),
1092 TREE_PURPOSE (conversions),
1097 conversion *identity_conv;
1098 /* Build a standard conversion sequence indicating the
1099 binding from the reference type returned by the
1100 function to the desired REFERENCE_TYPE. */
1102 = build_identity_conv (TREE_TYPE (TREE_TYPE
1103 (TREE_TYPE (cand->fn))),
1106 = (direct_reference_binding
1107 (reference_type, identity_conv));
1108 cand->second_conv->rvaluedness_matches_p
1109 = TYPE_REF_IS_RVALUE (TREE_TYPE (TREE_TYPE (cand->fn)))
1110 == TYPE_REF_IS_RVALUE (reference_type);
1111 cand->second_conv->bad_p |= cand->convs[0]->bad_p;
1113 /* Don't allow binding of lvalues to rvalue references. */
1114 if (TYPE_REF_IS_RVALUE (reference_type)
1115 && !TYPE_REF_IS_RVALUE (TREE_TYPE (TREE_TYPE (cand->fn))))
1116 cand->second_conv->bad_p = true;
1121 candidates = splice_viable (candidates, pedantic, &any_viable_p);
1122 /* If none of the conversion functions worked out, let our caller
1127 cand = tourney (candidates);
1131 /* Now that we know that this is the function we're going to use fix
1132 the dummy first argument. */
1133 gcc_assert (cand->first_arg == NULL_TREE
1134 || integer_zerop (cand->first_arg));
1135 cand->first_arg = build_this (expr);
1137 /* Build a user-defined conversion sequence representing the
1139 conv = build_conv (ck_user,
1140 TREE_TYPE (TREE_TYPE (cand->fn)),
1141 build_identity_conv (TREE_TYPE (expr), expr));
1144 if (cand->viable == -1)
1147 /* Merge it with the standard conversion sequence from the
1148 conversion function's return type to the desired type. */
1149 cand->second_conv = merge_conversion_sequences (conv, cand->second_conv);
1151 return cand->second_conv;
1154 /* A reference of the indicated TYPE is being bound directly to the
1155 expression represented by the implicit conversion sequence CONV.
1156 Return a conversion sequence for this binding. */
1159 direct_reference_binding (tree type, conversion *conv)
1163 gcc_assert (TREE_CODE (type) == REFERENCE_TYPE);
1164 gcc_assert (TREE_CODE (conv->type) != REFERENCE_TYPE);
1166 t = TREE_TYPE (type);
1170 When a parameter of reference type binds directly
1171 (_dcl.init.ref_) to an argument expression, the implicit
1172 conversion sequence is the identity conversion, unless the
1173 argument expression has a type that is a derived class of the
1174 parameter type, in which case the implicit conversion sequence is
1175 a derived-to-base Conversion.
1177 If the parameter binds directly to the result of applying a
1178 conversion function to the argument expression, the implicit
1179 conversion sequence is a user-defined conversion sequence
1180 (_over.ics.user_), with the second standard conversion sequence
1181 either an identity conversion or, if the conversion function
1182 returns an entity of a type that is a derived class of the
1183 parameter type, a derived-to-base conversion. */
1184 if (!same_type_ignoring_top_level_qualifiers_p (t, conv->type))
1186 /* Represent the derived-to-base conversion. */
1187 conv = build_conv (ck_base, t, conv);
1188 /* We will actually be binding to the base-class subobject in
1189 the derived class, so we mark this conversion appropriately.
1190 That way, convert_like knows not to generate a temporary. */
1191 conv->need_temporary_p = false;
1193 return build_conv (ck_ref_bind, type, conv);
1196 /* Returns the conversion path from type FROM to reference type TO for
1197 purposes of reference binding. For lvalue binding, either pass a
1198 reference type to FROM or an lvalue expression to EXPR. If the
1199 reference will be bound to a temporary, NEED_TEMPORARY_P is set for
1200 the conversion returned. If C_CAST_P is true, this
1201 conversion is coming from a C-style cast. */
1204 reference_binding (tree rto, tree rfrom, tree expr, bool c_cast_p, int flags)
1206 conversion *conv = NULL;
1207 tree to = TREE_TYPE (rto);
1212 cp_lvalue_kind is_lvalue = clk_none;
1214 if (TREE_CODE (to) == FUNCTION_TYPE && expr && type_unknown_p (expr))
1216 expr = instantiate_type (to, expr, tf_none);
1217 if (expr == error_mark_node)
1219 from = TREE_TYPE (expr);
1222 if (TREE_CODE (from) == REFERENCE_TYPE)
1224 /* Anything with reference type is an lvalue. */
1225 is_lvalue = clk_ordinary;
1226 from = TREE_TYPE (from);
1229 if (expr && BRACE_ENCLOSED_INITIALIZER_P (expr))
1231 maybe_warn_cpp0x ("extended initializer lists");
1232 conv = implicit_conversion (to, from, expr, c_cast_p,
1234 if (!CLASS_TYPE_P (to)
1235 && CONSTRUCTOR_NELTS (expr) == 1)
1237 expr = CONSTRUCTOR_ELT (expr, 0)->value;
1238 from = TREE_TYPE (expr);
1242 if (is_lvalue == clk_none && expr)
1243 is_lvalue = real_lvalue_p (expr);
1246 if ((is_lvalue & clk_bitfield) != 0)
1247 tfrom = unlowered_expr_type (expr);
1249 /* Figure out whether or not the types are reference-related and
1250 reference compatible. We have do do this after stripping
1251 references from FROM. */
1252 related_p = reference_related_p (to, tfrom);
1253 /* If this is a C cast, first convert to an appropriately qualified
1254 type, so that we can later do a const_cast to the desired type. */
1255 if (related_p && c_cast_p
1256 && !at_least_as_qualified_p (to, tfrom))
1257 to = build_qualified_type (to, cp_type_quals (tfrom));
1258 compatible_p = reference_compatible_p (to, tfrom);
1260 /* Directly bind reference when target expression's type is compatible with
1261 the reference and expression is an lvalue. In DR391, the wording in
1262 [8.5.3/5 dcl.init.ref] is changed to also require direct bindings for
1263 const and rvalue references to rvalues of compatible class type.
1264 We should also do direct bindings for non-class "rvalues" derived from
1265 rvalue references. */
1268 || (((CP_TYPE_CONST_NON_VOLATILE_P (to)
1269 && !(flags & LOOKUP_NO_TEMP_BIND))
1270 || TYPE_REF_IS_RVALUE (rto))
1271 && (CLASS_TYPE_P (from) || (expr && lvalue_p (expr))))))
1275 If the initializer expression
1277 -- is an lvalue (but not an lvalue for a bit-field), and "cv1 T1"
1278 is reference-compatible with "cv2 T2,"
1280 the reference is bound directly to the initializer expression
1284 If the initializer expression is an rvalue, with T2 a class type,
1285 and "cv1 T1" is reference-compatible with "cv2 T2", the reference
1286 is bound to the object represented by the rvalue or to a sub-object
1287 within that object. */
1289 conv = build_identity_conv (tfrom, expr);
1290 conv = direct_reference_binding (rto, conv);
1292 if (flags & LOOKUP_PREFER_RVALUE)
1293 /* The top-level caller requested that we pretend that the lvalue
1294 be treated as an rvalue. */
1295 conv->rvaluedness_matches_p = TYPE_REF_IS_RVALUE (rto);
1297 conv->rvaluedness_matches_p
1298 = (TYPE_REF_IS_RVALUE (rto) == !is_lvalue);
1300 if ((is_lvalue & clk_bitfield) != 0
1301 || ((is_lvalue & clk_packed) != 0 && !TYPE_PACKED (to)))
1302 /* For the purposes of overload resolution, we ignore the fact
1303 this expression is a bitfield or packed field. (In particular,
1304 [over.ics.ref] says specifically that a function with a
1305 non-const reference parameter is viable even if the
1306 argument is a bitfield.)
1308 However, when we actually call the function we must create
1309 a temporary to which to bind the reference. If the
1310 reference is volatile, or isn't const, then we cannot make
1311 a temporary, so we just issue an error when the conversion
1313 conv->need_temporary_p = true;
1315 /* Don't allow binding of lvalues to rvalue references. */
1316 if (is_lvalue && TYPE_REF_IS_RVALUE (rto)
1317 && !(flags & LOOKUP_PREFER_RVALUE))
1322 /* [class.conv.fct] A conversion function is never used to convert a
1323 (possibly cv-qualified) object to the (possibly cv-qualified) same
1324 object type (or a reference to it), to a (possibly cv-qualified) base
1325 class of that type (or a reference to it).... */
1326 else if (CLASS_TYPE_P (from) && !related_p
1327 && !(flags & LOOKUP_NO_CONVERSION))
1331 If the initializer expression
1333 -- has a class type (i.e., T2 is a class type) can be
1334 implicitly converted to an lvalue of type "cv3 T3," where
1335 "cv1 T1" is reference-compatible with "cv3 T3". (this
1336 conversion is selected by enumerating the applicable
1337 conversion functions (_over.match.ref_) and choosing the
1338 best one through overload resolution. (_over.match_).
1340 the reference is bound to the lvalue result of the conversion
1341 in the second case. */
1342 conv = convert_class_to_reference (rto, from, expr, flags);
1347 /* From this point on, we conceptually need temporaries, even if we
1348 elide them. Only the cases above are "direct bindings". */
1349 if (flags & LOOKUP_NO_TEMP_BIND)
1354 When a parameter of reference type is not bound directly to an
1355 argument expression, the conversion sequence is the one required
1356 to convert the argument expression to the underlying type of the
1357 reference according to _over.best.ics_. Conceptually, this
1358 conversion sequence corresponds to copy-initializing a temporary
1359 of the underlying type with the argument expression. Any
1360 difference in top-level cv-qualification is subsumed by the
1361 initialization itself and does not constitute a conversion. */
1365 Otherwise, the reference shall be to a non-volatile const type.
1367 Under C++0x, [8.5.3/5 dcl.init.ref] it may also be an rvalue reference */
1368 if (!CP_TYPE_CONST_NON_VOLATILE_P (to) && !TYPE_REF_IS_RVALUE (rto))
1373 Otherwise, a temporary of type "cv1 T1" is created and
1374 initialized from the initializer expression using the rules for a
1375 non-reference copy initialization. If T1 is reference-related to
1376 T2, cv1 must be the same cv-qualification as, or greater
1377 cv-qualification than, cv2; otherwise, the program is ill-formed. */
1378 if (related_p && !at_least_as_qualified_p (to, from))
1381 /* We're generating a temporary now, but don't bind any more in the
1382 conversion (specifically, don't slice the temporary returned by a
1383 conversion operator). */
1384 flags |= LOOKUP_NO_TEMP_BIND;
1386 /* Temporaries are copy-initialized, except for this hack to allow
1387 explicit conversion ops to the copy ctor. See also
1388 add_function_candidate. */
1389 if (!(flags & LOOKUP_COPY_PARM))
1390 flags |= LOOKUP_ONLYCONVERTING;
1393 conv = implicit_conversion (to, from, expr, c_cast_p,
1398 conv = build_conv (ck_ref_bind, rto, conv);
1399 /* This reference binding, unlike those above, requires the
1400 creation of a temporary. */
1401 conv->need_temporary_p = true;
1402 conv->rvaluedness_matches_p = TYPE_REF_IS_RVALUE (rto);
1407 /* Returns the implicit conversion sequence (see [over.ics]) from type
1408 FROM to type TO. The optional expression EXPR may affect the
1409 conversion. FLAGS are the usual overloading flags. If C_CAST_P is
1410 true, this conversion is coming from a C-style cast. */
1413 implicit_conversion (tree to, tree from, tree expr, bool c_cast_p,
1418 if (from == error_mark_node || to == error_mark_node
1419 || expr == error_mark_node)
1422 if (TREE_CODE (to) == REFERENCE_TYPE)
1423 conv = reference_binding (to, from, expr, c_cast_p, flags);
1425 conv = standard_conversion (to, from, expr, c_cast_p, flags);
1430 if (expr && BRACE_ENCLOSED_INITIALIZER_P (expr))
1432 if (is_std_init_list (to))
1433 return build_list_conv (to, expr, flags);
1435 /* Allow conversion from an initializer-list with one element to a
1437 if (SCALAR_TYPE_P (to))
1439 int nelts = CONSTRUCTOR_NELTS (expr);
1443 elt = integer_zero_node;
1444 else if (nelts == 1)
1445 elt = CONSTRUCTOR_ELT (expr, 0)->value;
1447 elt = error_mark_node;
1449 conv = implicit_conversion (to, TREE_TYPE (elt), elt,
1453 conv->check_narrowing = true;
1454 if (BRACE_ENCLOSED_INITIALIZER_P (elt))
1455 /* Too many levels of braces, i.e. '{{1}}'. */
1462 if (expr != NULL_TREE
1463 && (MAYBE_CLASS_TYPE_P (from)
1464 || MAYBE_CLASS_TYPE_P (to))
1465 && (flags & LOOKUP_NO_CONVERSION) == 0)
1467 struct z_candidate *cand;
1468 int convflags = (flags & (LOOKUP_NO_TEMP_BIND|LOOKUP_ONLYCONVERTING));
1470 if (CLASS_TYPE_P (to)
1471 && !CLASSTYPE_NON_AGGREGATE (complete_type (to))
1472 && BRACE_ENCLOSED_INITIALIZER_P (expr))
1473 return build_aggr_conv (to, expr, flags);
1475 cand = build_user_type_conversion_1 (to, expr, convflags);
1477 conv = cand->second_conv;
1479 /* We used to try to bind a reference to a temporary here, but that
1480 is now handled after the recursive call to this function at the end
1481 of reference_binding. */
1488 /* Add a new entry to the list of candidates. Used by the add_*_candidate
1489 functions. ARGS will not be changed until a single candidate is
1492 static struct z_candidate *
1493 add_candidate (struct z_candidate **candidates,
1494 tree fn, tree first_arg, const VEC(tree,gc) *args,
1495 size_t num_convs, conversion **convs,
1496 tree access_path, tree conversion_path,
1499 struct z_candidate *cand = (struct z_candidate *)
1500 conversion_obstack_alloc (sizeof (struct z_candidate));
1503 cand->first_arg = first_arg;
1505 cand->convs = convs;
1506 cand->num_convs = num_convs;
1507 cand->access_path = access_path;
1508 cand->conversion_path = conversion_path;
1509 cand->viable = viable;
1510 cand->next = *candidates;
1516 /* Create an overload candidate for the function or method FN called
1517 with the argument list FIRST_ARG/ARGS and add it to CANDIDATES.
1518 FLAGS is passed on to implicit_conversion.
1520 This does not change ARGS.
1522 CTYPE, if non-NULL, is the type we want to pretend this function
1523 comes from for purposes of overload resolution. */
1525 static struct z_candidate *
1526 add_function_candidate (struct z_candidate **candidates,
1527 tree fn, tree ctype, tree first_arg,
1528 const VEC(tree,gc) *args, tree access_path,
1529 tree conversion_path, int flags)
1531 tree parmlist = TYPE_ARG_TYPES (TREE_TYPE (fn));
1535 tree orig_first_arg = first_arg;
1539 /* At this point we should not see any functions which haven't been
1540 explicitly declared, except for friend functions which will have
1541 been found using argument dependent lookup. */
1542 gcc_assert (!DECL_ANTICIPATED (fn) || DECL_HIDDEN_FRIEND_P (fn));
1544 /* The `this', `in_chrg' and VTT arguments to constructors are not
1545 considered in overload resolution. */
1546 if (DECL_CONSTRUCTOR_P (fn))
1548 parmlist = skip_artificial_parms_for (fn, parmlist);
1549 skip = num_artificial_parms_for (fn);
1550 if (skip > 0 && first_arg != NULL_TREE)
1553 first_arg = NULL_TREE;
1559 len = VEC_length (tree, args) - skip + (first_arg != NULL_TREE ? 1 : 0);
1560 convs = alloc_conversions (len);
1562 /* 13.3.2 - Viable functions [over.match.viable]
1563 First, to be a viable function, a candidate function shall have enough
1564 parameters to agree in number with the arguments in the list.
1566 We need to check this first; otherwise, checking the ICSes might cause
1567 us to produce an ill-formed template instantiation. */
1569 parmnode = parmlist;
1570 for (i = 0; i < len; ++i)
1572 if (parmnode == NULL_TREE || parmnode == void_list_node)
1574 parmnode = TREE_CHAIN (parmnode);
1577 if (i < len && parmnode)
1580 /* Make sure there are default args for the rest of the parms. */
1581 else if (!sufficient_parms_p (parmnode))
1587 /* Second, for F to be a viable function, there shall exist for each
1588 argument an implicit conversion sequence that converts that argument
1589 to the corresponding parameter of F. */
1591 parmnode = parmlist;
1593 for (i = 0; i < len; ++i)
1599 if (parmnode == void_list_node)
1602 if (i == 0 && first_arg != NULL_TREE)
1605 arg = VEC_index (tree, args,
1606 i + skip - (first_arg != NULL_TREE ? 1 : 0));
1607 argtype = lvalue_type (arg);
1609 is_this = (i == 0 && DECL_NONSTATIC_MEMBER_FUNCTION_P (fn)
1610 && ! DECL_CONSTRUCTOR_P (fn));
1614 tree parmtype = TREE_VALUE (parmnode);
1617 /* The type of the implicit object parameter ('this') for
1618 overload resolution is not always the same as for the
1619 function itself; conversion functions are considered to
1620 be members of the class being converted, and functions
1621 introduced by a using-declaration are considered to be
1622 members of the class that uses them.
1624 Since build_over_call ignores the ICS for the `this'
1625 parameter, we can just change the parm type. */
1626 if (ctype && is_this)
1629 = build_qualified_type (ctype,
1630 TYPE_QUALS (TREE_TYPE (parmtype)));
1631 parmtype = build_pointer_type (parmtype);
1634 if (ctype && i == 0 && DECL_COPY_CONSTRUCTOR_P (fn)
1637 /* Hack: Direct-initialize copy parm (i.e. suppress
1638 LOOKUP_ONLYCONVERTING) to make explicit conversion ops
1639 work. See also reference_binding. */
1640 lflags |= LOOKUP_COPY_PARM;
1641 if (flags & LOOKUP_NO_COPY_CTOR_CONVERSION)
1642 lflags |= LOOKUP_NO_CONVERSION;
1645 lflags |= LOOKUP_ONLYCONVERTING;
1647 t = implicit_conversion (parmtype, argtype, arg,
1648 /*c_cast_p=*/false, lflags);
1652 t = build_identity_conv (argtype, arg);
1653 t->ellipsis_p = true;
1670 parmnode = TREE_CHAIN (parmnode);
1674 return add_candidate (candidates, fn, orig_first_arg, args, len, convs,
1675 access_path, conversion_path, viable);
1678 /* Create an overload candidate for the conversion function FN which will
1679 be invoked for expression OBJ, producing a pointer-to-function which
1680 will in turn be called with the argument list FIRST_ARG/ARGLIST,
1681 and add it to CANDIDATES. This does not change ARGLIST. FLAGS is
1682 passed on to implicit_conversion.
1684 Actually, we don't really care about FN; we care about the type it
1685 converts to. There may be multiple conversion functions that will
1686 convert to that type, and we rely on build_user_type_conversion_1 to
1687 choose the best one; so when we create our candidate, we record the type
1688 instead of the function. */
1690 static struct z_candidate *
1691 add_conv_candidate (struct z_candidate **candidates, tree fn, tree obj,
1692 tree first_arg, const VEC(tree,gc) *arglist,
1693 tree access_path, tree conversion_path)
1695 tree totype = TREE_TYPE (TREE_TYPE (fn));
1696 int i, len, viable, flags;
1697 tree parmlist, parmnode;
1700 for (parmlist = totype; TREE_CODE (parmlist) != FUNCTION_TYPE; )
1701 parmlist = TREE_TYPE (parmlist);
1702 parmlist = TYPE_ARG_TYPES (parmlist);
1704 len = VEC_length (tree, arglist) + (first_arg != NULL_TREE ? 1 : 0) + 1;
1705 convs = alloc_conversions (len);
1706 parmnode = parmlist;
1708 flags = LOOKUP_IMPLICIT;
1710 /* Don't bother looking up the same type twice. */
1711 if (*candidates && (*candidates)->fn == totype)
1714 for (i = 0; i < len; ++i)
1721 else if (i == 1 && first_arg != NULL_TREE)
1724 arg = VEC_index (tree, arglist,
1725 i - (first_arg != NULL_TREE ? 1 : 0) - 1);
1726 argtype = lvalue_type (arg);
1729 t = implicit_conversion (totype, argtype, arg, /*c_cast_p=*/false,
1731 else if (parmnode == void_list_node)
1734 t = implicit_conversion (TREE_VALUE (parmnode), argtype, arg,
1735 /*c_cast_p=*/false, flags);
1738 t = build_identity_conv (argtype, arg);
1739 t->ellipsis_p = true;
1753 parmnode = TREE_CHAIN (parmnode);
1759 if (!sufficient_parms_p (parmnode))
1762 return add_candidate (candidates, totype, first_arg, arglist, len, convs,
1763 access_path, conversion_path, viable);
1767 build_builtin_candidate (struct z_candidate **candidates, tree fnname,
1768 tree type1, tree type2, tree *args, tree *argtypes,
1780 num_convs = args[2] ? 3 : (args[1] ? 2 : 1);
1781 convs = alloc_conversions (num_convs);
1783 /* TRUTH_*_EXPR do "contextual conversion to bool", which means explicit
1784 conversion ops are allowed. We handle that here by just checking for
1785 boolean_type_node because other operators don't ask for it. COND_EXPR
1786 also does contextual conversion to bool for the first operand, but we
1787 handle that in build_conditional_expr, and type1 here is operand 2. */
1788 if (type1 != boolean_type_node)
1789 flags |= LOOKUP_ONLYCONVERTING;
1791 for (i = 0; i < 2; ++i)
1796 t = implicit_conversion (types[i], argtypes[i], args[i],
1797 /*c_cast_p=*/false, flags);
1801 /* We need something for printing the candidate. */
1802 t = build_identity_conv (types[i], NULL_TREE);
1809 /* For COND_EXPR we rearranged the arguments; undo that now. */
1812 convs[2] = convs[1];
1813 convs[1] = convs[0];
1814 t = implicit_conversion (boolean_type_node, argtypes[2], args[2],
1815 /*c_cast_p=*/false, flags);
1822 add_candidate (candidates, fnname, /*first_arg=*/NULL_TREE, /*args=*/NULL,
1824 /*access_path=*/NULL_TREE,
1825 /*conversion_path=*/NULL_TREE,
1830 is_complete (tree t)
1832 return COMPLETE_TYPE_P (complete_type (t));
1835 /* Returns nonzero if TYPE is a promoted arithmetic type. */
1838 promoted_arithmetic_type_p (tree type)
1842 In this section, the term promoted integral type is used to refer
1843 to those integral types which are preserved by integral promotion
1844 (including e.g. int and long but excluding e.g. char).
1845 Similarly, the term promoted arithmetic type refers to promoted
1846 integral types plus floating types. */
1847 return ((CP_INTEGRAL_TYPE_P (type)
1848 && same_type_p (type_promotes_to (type), type))
1849 || TREE_CODE (type) == REAL_TYPE);
1852 /* Create any builtin operator overload candidates for the operator in
1853 question given the converted operand types TYPE1 and TYPE2. The other
1854 args are passed through from add_builtin_candidates to
1855 build_builtin_candidate.
1857 TYPE1 and TYPE2 may not be permissible, and we must filter them.
1858 If CODE is requires candidates operands of the same type of the kind
1859 of which TYPE1 and TYPE2 are, we add both candidates
1860 CODE (TYPE1, TYPE1) and CODE (TYPE2, TYPE2). */
1863 add_builtin_candidate (struct z_candidate **candidates, enum tree_code code,
1864 enum tree_code code2, tree fnname, tree type1,
1865 tree type2, tree *args, tree *argtypes, int flags)
1869 case POSTINCREMENT_EXPR:
1870 case POSTDECREMENT_EXPR:
1871 args[1] = integer_zero_node;
1872 type2 = integer_type_node;
1881 /* 4 For every pair T, VQ), where T is an arithmetic or enumeration type,
1882 and VQ is either volatile or empty, there exist candidate operator
1883 functions of the form
1884 VQ T& operator++(VQ T&);
1885 T operator++(VQ T&, int);
1886 5 For every pair T, VQ), where T is an enumeration type or an arithmetic
1887 type other than bool, and VQ is either volatile or empty, there exist
1888 candidate operator functions of the form
1889 VQ T& operator--(VQ T&);
1890 T operator--(VQ T&, int);
1891 6 For every pair T, VQ), where T is a cv-qualified or cv-unqualified
1892 complete object type, and VQ is either volatile or empty, there exist
1893 candidate operator functions of the form
1894 T*VQ& operator++(T*VQ&);
1895 T*VQ& operator--(T*VQ&);
1896 T* operator++(T*VQ&, int);
1897 T* operator--(T*VQ&, int); */
1899 case POSTDECREMENT_EXPR:
1900 case PREDECREMENT_EXPR:
1901 if (TREE_CODE (type1) == BOOLEAN_TYPE)
1903 case POSTINCREMENT_EXPR:
1904 case PREINCREMENT_EXPR:
1905 if (ARITHMETIC_TYPE_P (type1) || TYPE_PTROB_P (type1))
1907 type1 = build_reference_type (type1);
1912 /* 7 For every cv-qualified or cv-unqualified complete object type T, there
1913 exist candidate operator functions of the form
1917 8 For every function type T, there exist candidate operator functions of
1919 T& operator*(T*); */
1922 if (TREE_CODE (type1) == POINTER_TYPE
1923 && (TYPE_PTROB_P (type1)
1924 || TREE_CODE (TREE_TYPE (type1)) == FUNCTION_TYPE))
1928 /* 9 For every type T, there exist candidate operator functions of the form
1931 10For every promoted arithmetic type T, there exist candidate operator
1932 functions of the form
1936 case UNARY_PLUS_EXPR: /* unary + */
1937 if (TREE_CODE (type1) == POINTER_TYPE)
1940 if (ARITHMETIC_TYPE_P (type1))
1944 /* 11For every promoted integral type T, there exist candidate operator
1945 functions of the form
1949 if (INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (type1))
1953 /* 12For every quintuple C1, C2, T, CV1, CV2), where C2 is a class type, C1
1954 is the same type as C2 or is a derived class of C2, T is a complete
1955 object type or a function type, and CV1 and CV2 are cv-qualifier-seqs,
1956 there exist candidate operator functions of the form
1957 CV12 T& operator->*(CV1 C1*, CV2 T C2::*);
1958 where CV12 is the union of CV1 and CV2. */
1961 if (TREE_CODE (type1) == POINTER_TYPE
1962 && TYPE_PTR_TO_MEMBER_P (type2))
1964 tree c1 = TREE_TYPE (type1);
1965 tree c2 = TYPE_PTRMEM_CLASS_TYPE (type2);
1967 if (MAYBE_CLASS_TYPE_P (c1) && DERIVED_FROM_P (c2, c1)
1968 && (TYPE_PTRMEMFUNC_P (type2)
1969 || is_complete (TYPE_PTRMEM_POINTED_TO_TYPE (type2))))
1974 /* 13For every pair of promoted arithmetic types L and R, there exist can-
1975 didate operator functions of the form
1980 bool operator<(L, R);
1981 bool operator>(L, R);
1982 bool operator<=(L, R);
1983 bool operator>=(L, R);
1984 bool operator==(L, R);
1985 bool operator!=(L, R);
1986 where LR is the result of the usual arithmetic conversions between
1989 14For every pair of types T and I, where T is a cv-qualified or cv-
1990 unqualified complete object type and I is a promoted integral type,
1991 there exist candidate operator functions of the form
1992 T* operator+(T*, I);
1993 T& operator[](T*, I);
1994 T* operator-(T*, I);
1995 T* operator+(I, T*);
1996 T& operator[](I, T*);
1998 15For every T, where T is a pointer to complete object type, there exist
1999 candidate operator functions of the form112)
2000 ptrdiff_t operator-(T, T);
2002 16For every pointer or enumeration type T, there exist candidate operator
2003 functions of the form
2004 bool operator<(T, T);
2005 bool operator>(T, T);
2006 bool operator<=(T, T);
2007 bool operator>=(T, T);
2008 bool operator==(T, T);
2009 bool operator!=(T, T);
2011 17For every pointer to member type T, there exist candidate operator
2012 functions of the form
2013 bool operator==(T, T);
2014 bool operator!=(T, T); */
2017 if (TYPE_PTROB_P (type1) && TYPE_PTROB_P (type2))
2019 if (TYPE_PTROB_P (type1)
2020 && INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (type2))
2022 type2 = ptrdiff_type_node;
2026 case TRUNC_DIV_EXPR:
2027 if (ARITHMETIC_TYPE_P (type1) && ARITHMETIC_TYPE_P (type2))
2033 if ((TYPE_PTRMEMFUNC_P (type1) && TYPE_PTRMEMFUNC_P (type2))
2034 || (TYPE_PTRMEM_P (type1) && TYPE_PTRMEM_P (type2)))
2036 if (TYPE_PTR_TO_MEMBER_P (type1) && null_ptr_cst_p (args[1]))
2041 if (TYPE_PTR_TO_MEMBER_P (type2) && null_ptr_cst_p (args[0]))
2053 if (ARITHMETIC_TYPE_P (type1) && ARITHMETIC_TYPE_P (type2))
2055 if (TYPE_PTR_P (type1) && TYPE_PTR_P (type2))
2057 if (TREE_CODE (type1) == ENUMERAL_TYPE
2058 && TREE_CODE (type2) == ENUMERAL_TYPE)
2060 if (TYPE_PTR_P (type1)
2061 && null_ptr_cst_p (args[1])
2062 && !uses_template_parms (type1))
2067 if (null_ptr_cst_p (args[0])
2068 && TYPE_PTR_P (type2)
2069 && !uses_template_parms (type2))
2077 if (ARITHMETIC_TYPE_P (type1) && ARITHMETIC_TYPE_P (type2))
2080 if (INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (type1) && TYPE_PTROB_P (type2))
2082 type1 = ptrdiff_type_node;
2085 if (TYPE_PTROB_P (type1) && INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (type2))
2087 type2 = ptrdiff_type_node;
2092 /* 18For every pair of promoted integral types L and R, there exist candi-
2093 date operator functions of the form
2100 where LR is the result of the usual arithmetic conversions between
2103 case TRUNC_MOD_EXPR:
2109 if (INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (type1) && INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (type2))
2113 /* 19For every triple L, VQ, R), where L is an arithmetic or enumeration
2114 type, VQ is either volatile or empty, and R is a promoted arithmetic
2115 type, there exist candidate operator functions of the form
2116 VQ L& operator=(VQ L&, R);
2117 VQ L& operator*=(VQ L&, R);
2118 VQ L& operator/=(VQ L&, R);
2119 VQ L& operator+=(VQ L&, R);
2120 VQ L& operator-=(VQ L&, R);
2122 20For every pair T, VQ), where T is any type and VQ is either volatile
2123 or empty, there exist candidate operator functions of the form
2124 T*VQ& operator=(T*VQ&, T*);
2126 21For every pair T, VQ), where T is a pointer to member type and VQ is
2127 either volatile or empty, there exist candidate operator functions of
2129 VQ T& operator=(VQ T&, T);
2131 22For every triple T, VQ, I), where T is a cv-qualified or cv-
2132 unqualified complete object type, VQ is either volatile or empty, and
2133 I is a promoted integral type, there exist candidate operator func-
2135 T*VQ& operator+=(T*VQ&, I);
2136 T*VQ& operator-=(T*VQ&, I);
2138 23For every triple L, VQ, R), where L is an integral or enumeration
2139 type, VQ is either volatile or empty, and R is a promoted integral
2140 type, there exist candidate operator functions of the form
2142 VQ L& operator%=(VQ L&, R);
2143 VQ L& operator<<=(VQ L&, R);
2144 VQ L& operator>>=(VQ L&, R);
2145 VQ L& operator&=(VQ L&, R);
2146 VQ L& operator^=(VQ L&, R);
2147 VQ L& operator|=(VQ L&, R); */
2154 if (TYPE_PTROB_P (type1) && INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (type2))
2156 type2 = ptrdiff_type_node;
2160 case TRUNC_DIV_EXPR:
2161 if (ARITHMETIC_TYPE_P (type1) && ARITHMETIC_TYPE_P (type2))
2165 case TRUNC_MOD_EXPR:
2171 if (INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (type1) && INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (type2))
2176 if (ARITHMETIC_TYPE_P (type1) && ARITHMETIC_TYPE_P (type2))
2178 if ((TYPE_PTRMEMFUNC_P (type1) && TYPE_PTRMEMFUNC_P (type2))
2179 || (TYPE_PTR_P (type1) && TYPE_PTR_P (type2))
2180 || (TYPE_PTRMEM_P (type1) && TYPE_PTRMEM_P (type2))
2181 || ((TYPE_PTRMEMFUNC_P (type1)
2182 || TREE_CODE (type1) == POINTER_TYPE)
2183 && null_ptr_cst_p (args[1])))
2193 type1 = build_reference_type (type1);
2199 For every pair of promoted arithmetic types L and R, there
2200 exist candidate operator functions of the form
2202 LR operator?(bool, L, R);
2204 where LR is the result of the usual arithmetic conversions
2205 between types L and R.
2207 For every type T, where T is a pointer or pointer-to-member
2208 type, there exist candidate operator functions of the form T
2209 operator?(bool, T, T); */
2211 if (promoted_arithmetic_type_p (type1)
2212 && promoted_arithmetic_type_p (type2))
2216 /* Otherwise, the types should be pointers. */
2217 if (!(TYPE_PTR_P (type1) || TYPE_PTR_TO_MEMBER_P (type1))
2218 || !(TYPE_PTR_P (type2) || TYPE_PTR_TO_MEMBER_P (type2)))
2221 /* We don't check that the two types are the same; the logic
2222 below will actually create two candidates; one in which both
2223 parameter types are TYPE1, and one in which both parameter
2231 /* If we're dealing with two pointer types or two enumeral types,
2232 we need candidates for both of them. */
2233 if (type2 && !same_type_p (type1, type2)
2234 && TREE_CODE (type1) == TREE_CODE (type2)
2235 && (TREE_CODE (type1) == REFERENCE_TYPE
2236 || (TYPE_PTR_P (type1) && TYPE_PTR_P (type2))
2237 || (TYPE_PTRMEM_P (type1) && TYPE_PTRMEM_P (type2))
2238 || TYPE_PTRMEMFUNC_P (type1)
2239 || MAYBE_CLASS_TYPE_P (type1)
2240 || TREE_CODE (type1) == ENUMERAL_TYPE))
2242 build_builtin_candidate
2243 (candidates, fnname, type1, type1, args, argtypes, flags);
2244 build_builtin_candidate
2245 (candidates, fnname, type2, type2, args, argtypes, flags);
2249 build_builtin_candidate
2250 (candidates, fnname, type1, type2, args, argtypes, flags);
2254 type_decays_to (tree type)
2256 if (TREE_CODE (type) == ARRAY_TYPE)
2257 return build_pointer_type (TREE_TYPE (type));
2258 if (TREE_CODE (type) == FUNCTION_TYPE)
2259 return build_pointer_type (type);
2263 /* There are three conditions of builtin candidates:
2265 1) bool-taking candidates. These are the same regardless of the input.
2266 2) pointer-pair taking candidates. These are generated for each type
2267 one of the input types converts to.
2268 3) arithmetic candidates. According to the standard, we should generate
2269 all of these, but I'm trying not to...
2271 Here we generate a superset of the possible candidates for this particular
2272 case. That is a subset of the full set the standard defines, plus some
2273 other cases which the standard disallows. add_builtin_candidate will
2274 filter out the invalid set. */
2277 add_builtin_candidates (struct z_candidate **candidates, enum tree_code code,
2278 enum tree_code code2, tree fnname, tree *args,
2283 tree type, argtypes[3];
2284 /* TYPES[i] is the set of possible builtin-operator parameter types
2285 we will consider for the Ith argument. These are represented as
2286 a TREE_LIST; the TREE_VALUE of each node is the potential
2290 for (i = 0; i < 3; ++i)
2293 argtypes[i] = unlowered_expr_type (args[i]);
2295 argtypes[i] = NULL_TREE;
2300 /* 4 For every pair T, VQ), where T is an arithmetic or enumeration type,
2301 and VQ is either volatile or empty, there exist candidate operator
2302 functions of the form
2303 VQ T& operator++(VQ T&); */
2305 case POSTINCREMENT_EXPR:
2306 case PREINCREMENT_EXPR:
2307 case POSTDECREMENT_EXPR:
2308 case PREDECREMENT_EXPR:
2313 /* 24There also exist candidate operator functions of the form
2314 bool operator!(bool);
2315 bool operator&&(bool, bool);
2316 bool operator||(bool, bool); */
2318 case TRUTH_NOT_EXPR:
2319 build_builtin_candidate
2320 (candidates, fnname, boolean_type_node,
2321 NULL_TREE, args, argtypes, flags);
2324 case TRUTH_ORIF_EXPR:
2325 case TRUTH_ANDIF_EXPR:
2326 build_builtin_candidate
2327 (candidates, fnname, boolean_type_node,
2328 boolean_type_node, args, argtypes, flags);
2350 types[0] = types[1] = NULL_TREE;
2352 for (i = 0; i < 2; ++i)
2356 else if (MAYBE_CLASS_TYPE_P (argtypes[i]))
2360 if (i == 0 && code == MODIFY_EXPR && code2 == NOP_EXPR)
2363 convs = lookup_conversions (argtypes[i]);
2365 if (code == COND_EXPR)
2367 if (real_lvalue_p (args[i]))
2368 types[i] = tree_cons
2369 (NULL_TREE, build_reference_type (argtypes[i]), types[i]);
2371 types[i] = tree_cons
2372 (NULL_TREE, TYPE_MAIN_VARIANT (argtypes[i]), types[i]);
2378 for (; convs; convs = TREE_CHAIN (convs))
2380 type = TREE_TYPE (convs);
2383 && (TREE_CODE (type) != REFERENCE_TYPE
2384 || CP_TYPE_CONST_P (TREE_TYPE (type))))
2387 if (code == COND_EXPR && TREE_CODE (type) == REFERENCE_TYPE)
2388 types[i] = tree_cons (NULL_TREE, type, types[i]);
2390 type = non_reference (type);
2391 if (i != 0 || ! ref1)
2393 type = TYPE_MAIN_VARIANT (type_decays_to (type));
2394 if (enum_p && TREE_CODE (type) == ENUMERAL_TYPE)
2395 types[i] = tree_cons (NULL_TREE, type, types[i]);
2396 if (INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (type))
2397 type = type_promotes_to (type);
2400 if (! value_member (type, types[i]))
2401 types[i] = tree_cons (NULL_TREE, type, types[i]);
2406 if (code == COND_EXPR && real_lvalue_p (args[i]))
2407 types[i] = tree_cons
2408 (NULL_TREE, build_reference_type (argtypes[i]), types[i]);
2409 type = non_reference (argtypes[i]);
2410 if (i != 0 || ! ref1)
2412 type = TYPE_MAIN_VARIANT (type_decays_to (type));
2413 if (enum_p && UNSCOPED_ENUM_P (type))
2414 types[i] = tree_cons (NULL_TREE, type, types[i]);
2415 if (INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (type))
2416 type = type_promotes_to (type);
2418 types[i] = tree_cons (NULL_TREE, type, types[i]);
2422 /* Run through the possible parameter types of both arguments,
2423 creating candidates with those parameter types. */
2424 for (; types[0]; types[0] = TREE_CHAIN (types[0]))
2427 for (type = types[1]; type; type = TREE_CHAIN (type))
2428 add_builtin_candidate
2429 (candidates, code, code2, fnname, TREE_VALUE (types[0]),
2430 TREE_VALUE (type), args, argtypes, flags);
2432 add_builtin_candidate
2433 (candidates, code, code2, fnname, TREE_VALUE (types[0]),
2434 NULL_TREE, args, argtypes, flags);
2439 /* If TMPL can be successfully instantiated as indicated by
2440 EXPLICIT_TARGS and ARGLIST, adds the instantiation to CANDIDATES.
2442 TMPL is the template. EXPLICIT_TARGS are any explicit template
2443 arguments. ARGLIST is the arguments provided at the call-site.
2444 This does not change ARGLIST. The RETURN_TYPE is the desired type
2445 for conversion operators. If OBJ is NULL_TREE, FLAGS and CTYPE are
2446 as for add_function_candidate. If an OBJ is supplied, FLAGS and
2447 CTYPE are ignored, and OBJ is as for add_conv_candidate. */
2449 static struct z_candidate*
2450 add_template_candidate_real (struct z_candidate **candidates, tree tmpl,
2451 tree ctype, tree explicit_targs, tree first_arg,
2452 const VEC(tree,gc) *arglist, tree return_type,
2453 tree access_path, tree conversion_path,
2454 int flags, tree obj, unification_kind_t strict)
2456 int ntparms = DECL_NTPARMS (tmpl);
2457 tree targs = make_tree_vec (ntparms);
2459 int skip_without_in_chrg;
2460 tree first_arg_without_in_chrg;
2461 tree *args_without_in_chrg;
2462 unsigned int nargs_without_in_chrg;
2463 unsigned int ia, ix;
2465 struct z_candidate *cand;
2469 nargs = (first_arg == NULL_TREE ? 0 : 1) + VEC_length (tree, arglist);
2471 skip_without_in_chrg = 0;
2473 first_arg_without_in_chrg = first_arg;
2475 /* We don't do deduction on the in-charge parameter, the VTT
2476 parameter or 'this'. */
2477 if (DECL_NONSTATIC_MEMBER_FUNCTION_P (tmpl))
2479 if (first_arg_without_in_chrg != NULL_TREE)
2480 first_arg_without_in_chrg = NULL_TREE;
2482 ++skip_without_in_chrg;
2485 if ((DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (tmpl)
2486 || DECL_BASE_CONSTRUCTOR_P (tmpl))
2487 && CLASSTYPE_VBASECLASSES (DECL_CONTEXT (tmpl)))
2489 if (first_arg_without_in_chrg != NULL_TREE)
2490 first_arg_without_in_chrg = NULL_TREE;
2492 ++skip_without_in_chrg;
2495 nargs_without_in_chrg = ((first_arg_without_in_chrg != NULL_TREE ? 1 : 0)
2496 + (VEC_length (tree, arglist)
2497 - skip_without_in_chrg));
2498 args_without_in_chrg = XALLOCAVEC (tree, nargs_without_in_chrg);
2500 if (first_arg_without_in_chrg != NULL_TREE)
2502 args_without_in_chrg[ia] = first_arg_without_in_chrg;
2505 for (ix = skip_without_in_chrg;
2506 VEC_iterate (tree, arglist, ix, arg);
2509 args_without_in_chrg[ia] = arg;
2512 gcc_assert (ia == nargs_without_in_chrg);
2514 i = fn_type_unification (tmpl, explicit_targs, targs,
2515 args_without_in_chrg,
2516 nargs_without_in_chrg,
2517 return_type, strict, flags);
2522 fn = instantiate_template (tmpl, targs, tf_none);
2523 if (fn == error_mark_node)
2528 A member function template is never instantiated to perform the
2529 copy of a class object to an object of its class type.
2531 It's a little unclear what this means; the standard explicitly
2532 does allow a template to be used to copy a class. For example,
2537 template <class T> A(const T&);
2540 void g () { A a (f ()); }
2542 the member template will be used to make the copy. The section
2543 quoted above appears in the paragraph that forbids constructors
2544 whose only parameter is (a possibly cv-qualified variant of) the
2545 class type, and a logical interpretation is that the intent was
2546 to forbid the instantiation of member templates which would then
2548 if (DECL_CONSTRUCTOR_P (fn) && nargs == 2)
2550 tree arg_types = FUNCTION_FIRST_USER_PARMTYPE (fn);
2551 if (arg_types && same_type_p (TYPE_MAIN_VARIANT (TREE_VALUE (arg_types)),
2556 if (obj != NULL_TREE)
2557 /* Aha, this is a conversion function. */
2558 cand = add_conv_candidate (candidates, fn, obj, first_arg, arglist,
2559 access_path, conversion_path);
2561 cand = add_function_candidate (candidates, fn, ctype,
2562 first_arg, arglist, access_path,
2563 conversion_path, flags);
2564 if (DECL_TI_TEMPLATE (fn) != tmpl)
2565 /* This situation can occur if a member template of a template
2566 class is specialized. Then, instantiate_template might return
2567 an instantiation of the specialization, in which case the
2568 DECL_TI_TEMPLATE field will point at the original
2569 specialization. For example:
2571 template <class T> struct S { template <class U> void f(U);
2572 template <> void f(int) {}; };
2576 Here, TMPL will be template <class U> S<double>::f(U).
2577 And, instantiate template will give us the specialization
2578 template <> S<double>::f(int). But, the DECL_TI_TEMPLATE field
2579 for this will point at template <class T> template <> S<T>::f(int),
2580 so that we can find the definition. For the purposes of
2581 overload resolution, however, we want the original TMPL. */
2582 cand->template_decl = tree_cons (tmpl, targs, NULL_TREE);
2584 cand->template_decl = DECL_TEMPLATE_INFO (fn);
2590 static struct z_candidate *
2591 add_template_candidate (struct z_candidate **candidates, tree tmpl, tree ctype,
2592 tree explicit_targs, tree first_arg,
2593 const VEC(tree,gc) *arglist, tree return_type,
2594 tree access_path, tree conversion_path, int flags,
2595 unification_kind_t strict)
2598 add_template_candidate_real (candidates, tmpl, ctype,
2599 explicit_targs, first_arg, arglist,
2600 return_type, access_path, conversion_path,
2601 flags, NULL_TREE, strict);
2605 static struct z_candidate *
2606 add_template_conv_candidate (struct z_candidate **candidates, tree tmpl,
2607 tree obj, tree first_arg,
2608 const VEC(tree,gc) *arglist,
2609 tree return_type, tree access_path,
2610 tree conversion_path)
2613 add_template_candidate_real (candidates, tmpl, NULL_TREE, NULL_TREE,
2614 first_arg, arglist, return_type, access_path,
2615 conversion_path, 0, obj, DEDUCE_CONV);
2618 /* The CANDS are the set of candidates that were considered for
2619 overload resolution. Return the set of viable candidates. If none
2620 of the candidates were viable, set *ANY_VIABLE_P to true. STRICT_P
2621 is true if a candidate should be considered viable only if it is
2624 static struct z_candidate*
2625 splice_viable (struct z_candidate *cands,
2629 struct z_candidate *viable;
2630 struct z_candidate **last_viable;
2631 struct z_candidate **cand;
2634 last_viable = &viable;
2635 *any_viable_p = false;
2640 struct z_candidate *c = *cand;
2641 if (strict_p ? c->viable == 1 : c->viable)
2646 last_viable = &c->next;
2647 *any_viable_p = true;
2653 return viable ? viable : cands;
2657 any_strictly_viable (struct z_candidate *cands)
2659 for (; cands; cands = cands->next)
2660 if (cands->viable == 1)
2665 /* OBJ is being used in an expression like "OBJ.f (...)". In other
2666 words, it is about to become the "this" pointer for a member
2667 function call. Take the address of the object. */
2670 build_this (tree obj)
2672 /* In a template, we are only concerned about the type of the
2673 expression, so we can take a shortcut. */
2674 if (processing_template_decl)
2675 return build_address (obj);
2677 return cp_build_unary_op (ADDR_EXPR, obj, 0, tf_warning_or_error);
2680 /* Returns true iff functions are equivalent. Equivalent functions are
2681 not '==' only if one is a function-local extern function or if
2682 both are extern "C". */
2685 equal_functions (tree fn1, tree fn2)
2687 if (DECL_LOCAL_FUNCTION_P (fn1) || DECL_LOCAL_FUNCTION_P (fn2)
2688 || DECL_EXTERN_C_FUNCTION_P (fn1))
2689 return decls_match (fn1, fn2);
2693 /* Print information about one overload candidate CANDIDATE. MSGSTR
2694 is the text to print before the candidate itself.
2696 NOTE: Unlike most diagnostic functions in GCC, MSGSTR is expected
2697 to have been run through gettext by the caller. This wart makes
2698 life simpler in print_z_candidates and for the translators. */
2701 print_z_candidate (const char *msgstr, struct z_candidate *candidate)
2703 if (TREE_CODE (candidate->fn) == IDENTIFIER_NODE)
2705 if (candidate->num_convs == 3)
2706 inform (input_location, "%s %D(%T, %T, %T) <built-in>", msgstr, candidate->fn,
2707 candidate->convs[0]->type,
2708 candidate->convs[1]->type,
2709 candidate->convs[2]->type);
2710 else if (candidate->num_convs == 2)
2711 inform (input_location, "%s %D(%T, %T) <built-in>", msgstr, candidate->fn,
2712 candidate->convs[0]->type,
2713 candidate->convs[1]->type);
2715 inform (input_location, "%s %D(%T) <built-in>", msgstr, candidate->fn,
2716 candidate->convs[0]->type);
2718 else if (TYPE_P (candidate->fn))
2719 inform (input_location, "%s %T <conversion>", msgstr, candidate->fn);
2720 else if (candidate->viable == -1)
2721 inform (input_location, "%s %+#D <near match>", msgstr, candidate->fn);
2722 else if (DECL_DELETED_FN (candidate->fn))
2723 inform (input_location, "%s %+#D <deleted>", msgstr, candidate->fn);
2725 inform (input_location, "%s %+#D", msgstr, candidate->fn);
2729 print_z_candidates (struct z_candidate *candidates)
2732 struct z_candidate *cand1;
2733 struct z_candidate **cand2;
2738 /* Remove deleted candidates. */
2740 for (cand2 = &cand1; *cand2; )
2742 if (TREE_CODE ((*cand2)->fn) == FUNCTION_DECL
2743 && DECL_DELETED_FN ((*cand2)->fn))
2744 *cand2 = (*cand2)->next;
2746 cand2 = &(*cand2)->next;
2748 /* ...if there are any non-deleted ones. */
2752 /* There may be duplicates in the set of candidates. We put off
2753 checking this condition as long as possible, since we have no way
2754 to eliminate duplicates from a set of functions in less than n^2
2755 time. Now we are about to emit an error message, so it is more
2756 permissible to go slowly. */
2757 for (cand1 = candidates; cand1; cand1 = cand1->next)
2759 tree fn = cand1->fn;
2760 /* Skip builtin candidates and conversion functions. */
2761 if (TREE_CODE (fn) != FUNCTION_DECL)
2763 cand2 = &cand1->next;
2766 if (TREE_CODE ((*cand2)->fn) == FUNCTION_DECL
2767 && equal_functions (fn, (*cand2)->fn))
2768 *cand2 = (*cand2)->next;
2770 cand2 = &(*cand2)->next;
2774 str = _("candidates are:");
2775 print_z_candidate (str, candidates);
2776 if (candidates->next)
2778 /* Indent successive candidates by the width of the translation
2779 of the above string. */
2780 size_t len = gcc_gettext_width (str) + 1;
2781 char *spaces = (char *) alloca (len);
2782 memset (spaces, ' ', len-1);
2783 spaces[len - 1] = '\0';
2785 candidates = candidates->next;
2788 print_z_candidate (spaces, candidates);
2789 candidates = candidates->next;
2795 /* USER_SEQ is a user-defined conversion sequence, beginning with a
2796 USER_CONV. STD_SEQ is the standard conversion sequence applied to
2797 the result of the conversion function to convert it to the final
2798 desired type. Merge the two sequences into a single sequence,
2799 and return the merged sequence. */
2802 merge_conversion_sequences (conversion *user_seq, conversion *std_seq)
2806 gcc_assert (user_seq->kind == ck_user);
2808 /* Find the end of the second conversion sequence. */
2810 while ((*t)->kind != ck_identity)
2811 t = &((*t)->u.next);
2813 /* Replace the identity conversion with the user conversion
2817 /* The entire sequence is a user-conversion sequence. */
2818 std_seq->user_conv_p = true;
2823 /* Returns the best overload candidate to perform the requested
2824 conversion. This function is used for three the overloading situations
2825 described in [over.match.copy], [over.match.conv], and [over.match.ref].
2826 If TOTYPE is a REFERENCE_TYPE, we're trying to find an lvalue binding as
2827 per [dcl.init.ref], so we ignore temporary bindings. */
2829 static struct z_candidate *
2830 build_user_type_conversion_1 (tree totype, tree expr, int flags)
2832 struct z_candidate *candidates, *cand;
2833 tree fromtype = TREE_TYPE (expr);
2834 tree ctors = NULL_TREE;
2835 tree conv_fns = NULL_TREE;
2836 conversion *conv = NULL;
2837 tree first_arg = NULL_TREE;
2838 VEC(tree,gc) *args = NULL;
2842 /* We represent conversion within a hierarchy using RVALUE_CONV and
2843 BASE_CONV, as specified by [over.best.ics]; these become plain
2844 constructor calls, as specified in [dcl.init]. */
2845 gcc_assert (!MAYBE_CLASS_TYPE_P (fromtype) || !MAYBE_CLASS_TYPE_P (totype)
2846 || !DERIVED_FROM_P (totype, fromtype));
2848 if (MAYBE_CLASS_TYPE_P (totype))
2849 ctors = lookup_fnfields (totype, complete_ctor_identifier, 0);
2851 if (MAYBE_CLASS_TYPE_P (fromtype))
2853 tree to_nonref = non_reference (totype);
2854 if (same_type_ignoring_top_level_qualifiers_p (to_nonref, fromtype) ||
2855 (CLASS_TYPE_P (to_nonref) && CLASS_TYPE_P (fromtype)
2856 && DERIVED_FROM_P (to_nonref, fromtype)))
2858 /* [class.conv.fct] A conversion function is never used to
2859 convert a (possibly cv-qualified) object to the (possibly
2860 cv-qualified) same object type (or a reference to it), to a
2861 (possibly cv-qualified) base class of that type (or a
2862 reference to it)... */
2865 conv_fns = lookup_conversions (fromtype);
2869 flags |= LOOKUP_NO_CONVERSION;
2871 /* It's OK to bind a temporary for converting constructor arguments, but
2872 not in converting the return value of a conversion operator. */
2873 convflags = ((flags & LOOKUP_NO_TEMP_BIND) | LOOKUP_NO_CONVERSION);
2874 flags &= ~LOOKUP_NO_TEMP_BIND;
2878 ctors = BASELINK_FUNCTIONS (ctors);
2880 first_arg = build_int_cst (build_pointer_type (totype), 0);
2881 if (BRACE_ENCLOSED_INITIALIZER_P (expr)
2882 && !TYPE_HAS_LIST_CTOR (totype))
2884 args = ctor_to_vec (expr);
2885 /* We still allow more conversions within an init-list. */
2886 flags = ((flags & ~LOOKUP_NO_CONVERSION)
2887 /* But not for the copy ctor. */
2888 |LOOKUP_NO_COPY_CTOR_CONVERSION
2889 |LOOKUP_NO_NARROWING);
2892 args = make_tree_vector_single (expr);
2894 /* We should never try to call the abstract or base constructor
2896 gcc_assert (!DECL_HAS_IN_CHARGE_PARM_P (OVL_CURRENT (ctors))
2897 && !DECL_HAS_VTT_PARM_P (OVL_CURRENT (ctors)));
2899 for (; ctors; ctors = OVL_NEXT (ctors))
2901 tree ctor = OVL_CURRENT (ctors);
2902 if (DECL_NONCONVERTING_P (ctor)
2903 && !BRACE_ENCLOSED_INITIALIZER_P (expr))
2906 if (TREE_CODE (ctor) == TEMPLATE_DECL)
2907 cand = add_template_candidate (&candidates, ctor, totype,
2908 NULL_TREE, first_arg, args, NULL_TREE,
2909 TYPE_BINFO (totype),
2910 TYPE_BINFO (totype),
2914 cand = add_function_candidate (&candidates, ctor, totype,
2915 first_arg, args, TYPE_BINFO (totype),
2916 TYPE_BINFO (totype),
2921 cand->second_conv = build_identity_conv (totype, NULL_TREE);
2923 /* If totype isn't a reference, and LOOKUP_NO_TEMP_BIND isn't
2924 set, then this is copy-initialization. In that case, "The
2925 result of the call is then used to direct-initialize the
2926 object that is the destination of the copy-initialization."
2929 We represent this in the conversion sequence with an
2930 rvalue conversion, which means a constructor call. */
2931 if (TREE_CODE (totype) != REFERENCE_TYPE
2932 && !(convflags & LOOKUP_NO_TEMP_BIND))
2934 = build_conv (ck_rvalue, totype, cand->second_conv);
2939 first_arg = build_this (expr);
2941 for (; conv_fns; conv_fns = TREE_CHAIN (conv_fns))
2944 tree conversion_path = TREE_PURPOSE (conv_fns);
2946 /* If we are called to convert to a reference type, we are trying to
2947 find an lvalue binding, so don't even consider temporaries. If
2948 we don't find an lvalue binding, the caller will try again to
2949 look for a temporary binding. */
2950 if (TREE_CODE (totype) == REFERENCE_TYPE)
2951 convflags |= LOOKUP_NO_TEMP_BIND;
2953 for (fns = TREE_VALUE (conv_fns); fns; fns = OVL_NEXT (fns))
2955 tree fn = OVL_CURRENT (fns);
2956 tree first = first_arg;
2958 if (DECL_NONCONVERTING_P (fn)
2959 && (flags & LOOKUP_ONLYCONVERTING))
2962 /* Lambdas have a static conversion op. */
2963 if (DECL_STATIC_FUNCTION_P (fn))
2966 /* [over.match.funcs] For conversion functions, the function
2967 is considered to be a member of the class of the implicit
2968 object argument for the purpose of defining the type of
2969 the implicit object parameter.
2971 So we pass fromtype as CTYPE to add_*_candidate. */
2973 if (TREE_CODE (fn) == TEMPLATE_DECL)
2974 cand = add_template_candidate (&candidates, fn, fromtype,
2976 first, NULL, totype,
2977 TYPE_BINFO (fromtype),
2982 cand = add_function_candidate (&candidates, fn, fromtype,
2984 TYPE_BINFO (fromtype),
2991 = implicit_conversion (totype,
2992 TREE_TYPE (TREE_TYPE (cand->fn)),
2994 /*c_cast_p=*/false, convflags);
2996 /* If LOOKUP_NO_TEMP_BIND isn't set, then this is
2997 copy-initialization. In that case, "The result of the
2998 call is then used to direct-initialize the object that is
2999 the destination of the copy-initialization." [dcl.init]
3001 We represent this in the conversion sequence with an
3002 rvalue conversion, which means a constructor call. But
3003 don't add a second rvalue conversion if there's already
3004 one there. Which there really shouldn't be, but it's
3005 harmless since we'd add it here anyway. */
3006 if (ics && MAYBE_CLASS_TYPE_P (totype) && ics->kind != ck_rvalue
3007 && !(convflags & LOOKUP_NO_TEMP_BIND))
3008 ics = build_conv (ck_rvalue, totype, ics);
3010 cand->second_conv = ics;
3014 else if (candidates->viable == 1 && ics->bad_p)
3020 candidates = splice_viable (candidates, pedantic, &any_viable_p);
3024 cand = tourney (candidates);
3027 if (flags & LOOKUP_COMPLAIN)
3029 error ("conversion from %qT to %qT is ambiguous",
3031 print_z_candidates (candidates);
3034 cand = candidates; /* any one will do */
3035 cand->second_conv = build_ambiguous_conv (totype, expr);
3036 cand->second_conv->user_conv_p = true;
3037 if (!any_strictly_viable (candidates))
3038 cand->second_conv->bad_p = true;
3039 /* If there are viable candidates, don't set ICS_BAD_FLAG; an
3040 ambiguous conversion is no worse than another user-defined
3046 /* Build the user conversion sequence. */
3049 (DECL_CONSTRUCTOR_P (cand->fn)
3050 ? totype : non_reference (TREE_TYPE (TREE_TYPE (cand->fn)))),
3051 build_identity_conv (TREE_TYPE (expr), expr));
3054 /* Remember that this was a list-initialization. */
3055 if (flags & LOOKUP_NO_NARROWING)
3056 conv->check_narrowing = true;
3058 /* Combine it with the second conversion sequence. */
3059 cand->second_conv = merge_conversion_sequences (conv,
3062 if (cand->viable == -1)
3063 cand->second_conv->bad_p = true;
3069 build_user_type_conversion (tree totype, tree expr, int flags)
3071 struct z_candidate *cand
3072 = build_user_type_conversion_1 (totype, expr, flags);
3076 if (cand->second_conv->kind == ck_ambig)
3077 return error_mark_node;
3078 expr = convert_like (cand->second_conv, expr, tf_warning_or_error);
3079 return convert_from_reference (expr);
3084 /* Do any initial processing on the arguments to a function call. */
3086 static VEC(tree,gc) *
3087 resolve_args (VEC(tree,gc) *args)
3092 for (ix = 0; VEC_iterate (tree, args, ix, arg); ++ix)
3094 if (error_operand_p (arg))
3096 else if (VOID_TYPE_P (TREE_TYPE (arg)))
3098 error ("invalid use of void expression");
3101 else if (invalid_nonstatic_memfn_p (arg, tf_warning_or_error))
3107 /* Perform overload resolution on FN, which is called with the ARGS.
3109 Return the candidate function selected by overload resolution, or
3110 NULL if the event that overload resolution failed. In the case
3111 that overload resolution fails, *CANDIDATES will be the set of
3112 candidates considered, and ANY_VIABLE_P will be set to true or
3113 false to indicate whether or not any of the candidates were
3116 The ARGS should already have gone through RESOLVE_ARGS before this
3117 function is called. */
3119 static struct z_candidate *
3120 perform_overload_resolution (tree fn,
3121 const VEC(tree,gc) *args,
3122 struct z_candidate **candidates,
3125 struct z_candidate *cand;
3126 tree explicit_targs = NULL_TREE;
3127 int template_only = 0;
3130 *any_viable_p = true;
3133 gcc_assert (TREE_CODE (fn) == FUNCTION_DECL
3134 || TREE_CODE (fn) == TEMPLATE_DECL
3135 || TREE_CODE (fn) == OVERLOAD
3136 || TREE_CODE (fn) == TEMPLATE_ID_EXPR);
3138 if (TREE_CODE (fn) == TEMPLATE_ID_EXPR)
3140 explicit_targs = TREE_OPERAND (fn, 1);
3141 fn = TREE_OPERAND (fn, 0);
3145 /* Add the various candidate functions. */
3146 add_candidates (fn, args, explicit_targs, template_only,
3147 /*conversion_path=*/NULL_TREE,
3148 /*access_path=*/NULL_TREE,
3152 *candidates = splice_viable (*candidates, pedantic, any_viable_p);
3156 cand = tourney (*candidates);
3160 /* Return an expression for a call to FN (a namespace-scope function,
3161 or a static member function) with the ARGS. This may change
3165 build_new_function_call (tree fn, VEC(tree,gc) **args, bool koenig_p,
3166 tsubst_flags_t complain)
3168 struct z_candidate *candidates, *cand;
3173 if (args != NULL && *args != NULL)
3175 *args = resolve_args (*args);
3177 return error_mark_node;
3180 /* If this function was found without using argument dependent
3181 lookup, then we want to ignore any undeclared friend
3187 fn = remove_hidden_names (fn);
3190 if (complain & tf_error)
3191 error ("no matching function for call to %<%D(%A)%>",
3192 DECL_NAME (OVL_CURRENT (orig_fn)),
3193 build_tree_list_vec (*args));
3194 return error_mark_node;
3198 /* Get the high-water mark for the CONVERSION_OBSTACK. */
3199 p = conversion_obstack_alloc (0);
3201 cand = perform_overload_resolution (fn, *args, &candidates, &any_viable_p);
3205 if (complain & tf_error)
3207 if (!any_viable_p && candidates && ! candidates->next)
3208 return cp_build_function_call_vec (candidates->fn, args, complain);
3209 if (TREE_CODE (fn) == TEMPLATE_ID_EXPR)
3210 fn = TREE_OPERAND (fn, 0);
3212 error ("no matching function for call to %<%D(%A)%>",
3213 DECL_NAME (OVL_CURRENT (fn)), build_tree_list_vec (*args));
3215 error ("call of overloaded %<%D(%A)%> is ambiguous",
3216 DECL_NAME (OVL_CURRENT (fn)), build_tree_list_vec (*args));
3218 print_z_candidates (candidates);
3220 result = error_mark_node;
3223 result = build_over_call (cand, LOOKUP_NORMAL, complain);
3225 /* Free all the conversions we allocated. */
3226 obstack_free (&conversion_obstack, p);
3231 /* Build a call to a global operator new. FNNAME is the name of the
3232 operator (either "operator new" or "operator new[]") and ARGS are
3233 the arguments provided. This may change ARGS. *SIZE points to the
3234 total number of bytes required by the allocation, and is updated if
3235 that is changed here. *COOKIE_SIZE is non-NULL if a cookie should
3236 be used. If this function determines that no cookie should be
3237 used, after all, *COOKIE_SIZE is set to NULL_TREE. If FN is
3238 non-NULL, it will be set, upon return, to the allocation function
3242 build_operator_new_call (tree fnname, VEC(tree,gc) **args,
3243 tree *size, tree *cookie_size,
3247 struct z_candidate *candidates;
3248 struct z_candidate *cand;
3253 VEC_safe_insert (tree, gc, *args, 0, *size);
3254 *args = resolve_args (*args);
3256 return error_mark_node;
3262 If this lookup fails to find the name, or if the allocated type
3263 is not a class type, the allocation function's name is looked
3264 up in the global scope.
3266 we disregard block-scope declarations of "operator new". */
3267 fns = lookup_function_nonclass (fnname, *args, /*block_p=*/false);
3269 /* Figure out what function is being called. */
3270 cand = perform_overload_resolution (fns, *args, &candidates, &any_viable_p);
3272 /* If no suitable function could be found, issue an error message
3277 error ("no matching function for call to %<%D(%A)%>",
3278 DECL_NAME (OVL_CURRENT (fns)), build_tree_list_vec (*args));
3280 error ("call of overloaded %<%D(%A)%> is ambiguous",
3281 DECL_NAME (OVL_CURRENT (fns)), build_tree_list_vec (*args));
3283 print_z_candidates (candidates);
3284 return error_mark_node;
3287 /* If a cookie is required, add some extra space. Whether
3288 or not a cookie is required cannot be determined until
3289 after we know which function was called. */
3292 bool use_cookie = true;
3293 if (!abi_version_at_least (2))
3295 /* In G++ 3.2, the check was implemented incorrectly; it
3296 looked at the placement expression, rather than the
3297 type of the function. */
3298 if (VEC_length (tree, *args) == 2
3299 && same_type_p (TREE_TYPE (VEC_index (tree, *args, 1)),
3307 arg_types = TYPE_ARG_TYPES (TREE_TYPE (cand->fn));
3308 /* Skip the size_t parameter. */
3309 arg_types = TREE_CHAIN (arg_types);
3310 /* Check the remaining parameters (if any). */
3312 && TREE_CHAIN (arg_types) == void_list_node
3313 && same_type_p (TREE_VALUE (arg_types),
3317 /* If we need a cookie, adjust the number of bytes allocated. */
3320 /* Update the total size. */
3321 *size = size_binop (PLUS_EXPR, *size, *cookie_size);
3322 /* Update the argument list to reflect the adjusted size. */
3323 VEC_replace (tree, *args, 0, *size);
3326 *cookie_size = NULL_TREE;
3329 /* Tell our caller which function we decided to call. */
3333 /* Build the CALL_EXPR. */
3334 return build_over_call (cand, LOOKUP_NORMAL, tf_warning_or_error);
3337 /* Build a new call to operator(). This may change ARGS. */
3340 build_op_call (tree obj, VEC(tree,gc) **args, tsubst_flags_t complain)
3342 struct z_candidate *candidates = 0, *cand;
3343 tree fns, convs, first_mem_arg = NULL_TREE;
3344 tree type = TREE_TYPE (obj);
3346 tree result = NULL_TREE;
3349 if (error_operand_p (obj))
3350 return error_mark_node;
3352 obj = prep_operand (obj);
3354 if (TYPE_PTRMEMFUNC_P (type))
3356 if (complain & tf_error)
3357 /* It's no good looking for an overloaded operator() on a
3358 pointer-to-member-function. */
3359 error ("pointer-to-member function %E cannot be called without an object; consider using .* or ->*", obj);
3360 return error_mark_node;
3363 if (TYPE_BINFO (type))
3365 fns = lookup_fnfields (TYPE_BINFO (type), ansi_opname (CALL_EXPR), 1);
3366 if (fns == error_mark_node)
3367 return error_mark_node;
3372 if (args != NULL && *args != NULL)
3374 *args = resolve_args (*args);
3376 return error_mark_node;
3379 /* Get the high-water mark for the CONVERSION_OBSTACK. */
3380 p = conversion_obstack_alloc (0);
3384 tree base = BINFO_TYPE (BASELINK_BINFO (fns));
3385 first_mem_arg = build_this (obj);
3387 for (fns = BASELINK_FUNCTIONS (fns); fns; fns = OVL_NEXT (fns))
3389 tree fn = OVL_CURRENT (fns);
3391 tree lfirst = first_mem_arg;
3392 if (DECL_STATIC_FUNCTION_P (fn))
3395 if (TREE_CODE (fn) == TEMPLATE_DECL)
3396 add_template_candidate (&candidates, fn, base, NULL_TREE,
3397 lfirst, *args, NULL_TREE,
3400 LOOKUP_NORMAL, DEDUCE_CALL);
3402 add_function_candidate
3403 (&candidates, fn, base, lfirst, *args, TYPE_BINFO (type),
3404 TYPE_BINFO (type), LOOKUP_NORMAL);
3408 /* Rather than mess with handling static conversion ops here, just don't
3409 look at conversions in lambdas. */
3410 if (LAMBDA_TYPE_P (type))
3413 convs = lookup_conversions (type);
3415 for (; convs; convs = TREE_CHAIN (convs))
3417 tree fns = TREE_VALUE (convs);
3418 tree totype = TREE_TYPE (convs);
3420 if ((TREE_CODE (totype) == POINTER_TYPE
3421 && TREE_CODE (TREE_TYPE (totype)) == FUNCTION_TYPE)
3422 || (TREE_CODE (totype) == REFERENCE_TYPE
3423 && TREE_CODE (TREE_TYPE (totype)) == FUNCTION_TYPE)
3424 || (TREE_CODE (totype) == REFERENCE_TYPE
3425 && TREE_CODE (TREE_TYPE (totype)) == POINTER_TYPE
3426 && TREE_CODE (TREE_TYPE (TREE_TYPE (totype))) == FUNCTION_TYPE))
3427 for (; fns; fns = OVL_NEXT (fns))
3429 tree fn = OVL_CURRENT (fns);
3431 if (DECL_NONCONVERTING_P (fn))
3434 if (TREE_CODE (fn) == TEMPLATE_DECL)
3435 add_template_conv_candidate
3436 (&candidates, fn, obj, NULL_TREE, *args, totype,
3437 /*access_path=*/NULL_TREE,
3438 /*conversion_path=*/NULL_TREE);
3440 add_conv_candidate (&candidates, fn, obj, NULL_TREE,
3441 *args, /*conversion_path=*/NULL_TREE,
3442 /*access_path=*/NULL_TREE);
3446 candidates = splice_viable (candidates, pedantic, &any_viable_p);
3449 if (complain & tf_error)
3451 error ("no match for call to %<(%T) (%A)%>", TREE_TYPE (obj),
3452 build_tree_list_vec (*args));
3453 print_z_candidates (candidates);
3455 result = error_mark_node;
3459 cand = tourney (candidates);
3462 if (complain & tf_error)
3464 error ("call of %<(%T) (%A)%> is ambiguous",
3465 TREE_TYPE (obj), build_tree_list_vec (*args));
3466 print_z_candidates (candidates);
3468 result = error_mark_node;
3470 /* Since cand->fn will be a type, not a function, for a conversion
3471 function, we must be careful not to unconditionally look at
3473 else if (TREE_CODE (cand->fn) == FUNCTION_DECL
3474 && DECL_OVERLOADED_OPERATOR_P (cand->fn) == CALL_EXPR)
3475 result = build_over_call (cand, LOOKUP_NORMAL, complain);
3478 obj = convert_like_with_context (cand->convs[0], obj, cand->fn, -1,
3480 obj = convert_from_reference (obj);
3481 result = cp_build_function_call_vec (obj, args, complain);
3485 /* Free all the conversions we allocated. */
3486 obstack_free (&conversion_obstack, p);
3492 op_error (enum tree_code code, enum tree_code code2,
3493 tree arg1, tree arg2, tree arg3, const char *problem)
3497 if (code == MODIFY_EXPR)
3498 opname = assignment_operator_name_info[code2].name;
3500 opname = operator_name_info[code].name;
3505 error ("%s for ternary %<operator?:%> in %<%E ? %E : %E%>",
3506 problem, arg1, arg2, arg3);
3509 case POSTINCREMENT_EXPR:
3510 case POSTDECREMENT_EXPR:
3511 error ("%s for %<operator%s%> in %<%E%s%>", problem, opname, arg1, opname);
3515 error ("%s for %<operator[]%> in %<%E[%E]%>", problem, arg1, arg2);
3520 error ("%s for %qs in %<%s %E%>", problem, opname, opname, arg1);
3525 error ("%s for %<operator%s%> in %<%E %s %E%>",
3526 problem, opname, arg1, opname, arg2);
3528 error ("%s for %<operator%s%> in %<%s%E%>",
3529 problem, opname, opname, arg1);
3534 /* Return the implicit conversion sequence that could be used to
3535 convert E1 to E2 in [expr.cond]. */
3538 conditional_conversion (tree e1, tree e2)
3540 tree t1 = non_reference (TREE_TYPE (e1));
3541 tree t2 = non_reference (TREE_TYPE (e2));
3547 If E2 is an lvalue: E1 can be converted to match E2 if E1 can be
3548 implicitly converted (clause _conv_) to the type "reference to
3549 T2", subject to the constraint that in the conversion the
3550 reference must bind directly (_dcl.init.ref_) to E1. */
3551 if (real_lvalue_p (e2))
3553 conv = implicit_conversion (build_reference_type (t2),
3557 LOOKUP_NO_TEMP_BIND|LOOKUP_ONLYCONVERTING);
3564 If E1 and E2 have class type, and the underlying class types are
3565 the same or one is a base class of the other: E1 can be converted
3566 to match E2 if the class of T2 is the same type as, or a base
3567 class of, the class of T1, and the cv-qualification of T2 is the
3568 same cv-qualification as, or a greater cv-qualification than, the
3569 cv-qualification of T1. If the conversion is applied, E1 is
3570 changed to an rvalue of type T2 that still refers to the original
3571 source class object (or the appropriate subobject thereof). */
3572 if (CLASS_TYPE_P (t1) && CLASS_TYPE_P (t2)
3573 && ((good_base = DERIVED_FROM_P (t2, t1)) || DERIVED_FROM_P (t1, t2)))
3575 if (good_base && at_least_as_qualified_p (t2, t1))
3577 conv = build_identity_conv (t1, e1);
3578 if (!same_type_p (TYPE_MAIN_VARIANT (t1),
3579 TYPE_MAIN_VARIANT (t2)))
3580 conv = build_conv (ck_base, t2, conv);
3582 conv = build_conv (ck_rvalue, t2, conv);
3591 Otherwise: E1 can be converted to match E2 if E1 can be implicitly
3592 converted to the type that expression E2 would have if E2 were
3593 converted to an rvalue (or the type it has, if E2 is an rvalue). */
3594 return implicit_conversion (t2, t1, e1, /*c_cast_p=*/false,
3598 /* Implement [expr.cond]. ARG1, ARG2, and ARG3 are the three
3599 arguments to the conditional expression. */
3602 build_conditional_expr (tree arg1, tree arg2, tree arg3,
3603 tsubst_flags_t complain)
3607 tree result = NULL_TREE;
3608 tree result_type = NULL_TREE;
3609 bool lvalue_p = true;
3610 struct z_candidate *candidates = 0;
3611 struct z_candidate *cand;
3614 /* As a G++ extension, the second argument to the conditional can be
3615 omitted. (So that `a ? : c' is roughly equivalent to `a ? a :
3616 c'.) If the second operand is omitted, make sure it is
3617 calculated only once. */
3620 if (complain & tf_error)
3621 pedwarn (input_location, OPT_pedantic,
3622 "ISO C++ forbids omitting the middle term of a ?: expression");
3624 /* Make sure that lvalues remain lvalues. See g++.oliva/ext1.C. */
3625 if (real_lvalue_p (arg1))
3626 arg2 = arg1 = stabilize_reference (arg1);
3628 arg2 = arg1 = save_expr (arg1);
3633 The first expression is implicitly converted to bool (clause
3635 arg1 = perform_implicit_conversion_flags (boolean_type_node, arg1, complain,
3638 /* If something has already gone wrong, just pass that fact up the
3640 if (error_operand_p (arg1)
3641 || error_operand_p (arg2)
3642 || error_operand_p (arg3))
3643 return error_mark_node;
3647 If either the second or the third operand has type (possibly
3648 cv-qualified) void, then the lvalue-to-rvalue (_conv.lval_),
3649 array-to-pointer (_conv.array_), and function-to-pointer
3650 (_conv.func_) standard conversions are performed on the second
3651 and third operands. */
3652 arg2_type = unlowered_expr_type (arg2);
3653 arg3_type = unlowered_expr_type (arg3);
3654 if (VOID_TYPE_P (arg2_type) || VOID_TYPE_P (arg3_type))
3656 /* Do the conversions. We don't these for `void' type arguments
3657 since it can't have any effect and since decay_conversion
3658 does not handle that case gracefully. */
3659 if (!VOID_TYPE_P (arg2_type))
3660 arg2 = decay_conversion (arg2);
3661 if (!VOID_TYPE_P (arg3_type))
3662 arg3 = decay_conversion (arg3);
3663 arg2_type = TREE_TYPE (arg2);
3664 arg3_type = TREE_TYPE (arg3);
3668 One of the following shall hold:
3670 --The second or the third operand (but not both) is a
3671 throw-expression (_except.throw_); the result is of the
3672 type of the other and is an rvalue.
3674 --Both the second and the third operands have type void; the
3675 result is of type void and is an rvalue.
3677 We must avoid calling force_rvalue for expressions of type
3678 "void" because it will complain that their value is being
3680 if (TREE_CODE (arg2) == THROW_EXPR
3681 && TREE_CODE (arg3) != THROW_EXPR)
3683 if (!VOID_TYPE_P (arg3_type))
3684 arg3 = force_rvalue (arg3);
3685 arg3_type = TREE_TYPE (arg3);
3686 result_type = arg3_type;
3688 else if (TREE_CODE (arg2) != THROW_EXPR
3689 && TREE_CODE (arg3) == THROW_EXPR)
3691 if (!VOID_TYPE_P (arg2_type))
3692 arg2 = force_rvalue (arg2);
3693 arg2_type = TREE_TYPE (arg2);
3694 result_type = arg2_type;
3696 else if (VOID_TYPE_P (arg2_type) && VOID_TYPE_P (arg3_type))
3697 result_type = void_type_node;
3700 if (complain & tf_error)
3702 if (VOID_TYPE_P (arg2_type))
3703 error ("second operand to the conditional operator "
3704 "is of type %<void%>, "
3705 "but the third operand is neither a throw-expression "
3706 "nor of type %<void%>");
3708 error ("third operand to the conditional operator "
3709 "is of type %<void%>, "
3710 "but the second operand is neither a throw-expression "
3711 "nor of type %<void%>");
3713 return error_mark_node;
3717 goto valid_operands;
3721 Otherwise, if the second and third operand have different types,
3722 and either has (possibly cv-qualified) class type, an attempt is
3723 made to convert each of those operands to the type of the other. */
3724 else if (!same_type_p (arg2_type, arg3_type)
3725 && (CLASS_TYPE_P (arg2_type) || CLASS_TYPE_P (arg3_type)))
3730 /* Get the high-water mark for the CONVERSION_OBSTACK. */
3731 p = conversion_obstack_alloc (0);
3733 conv2 = conditional_conversion (arg2, arg3);
3734 conv3 = conditional_conversion (arg3, arg2);
3738 If both can be converted, or one can be converted but the
3739 conversion is ambiguous, the program is ill-formed. If
3740 neither can be converted, the operands are left unchanged and
3741 further checking is performed as described below. If exactly
3742 one conversion is possible, that conversion is applied to the
3743 chosen operand and the converted operand is used in place of
3744 the original operand for the remainder of this section. */
3745 if ((conv2 && !conv2->bad_p
3746 && conv3 && !conv3->bad_p)
3747 || (conv2 && conv2->kind == ck_ambig)
3748 || (conv3 && conv3->kind == ck_ambig))
3750 error ("operands to ?: have different types %qT and %qT",
3751 arg2_type, arg3_type);
3752 result = error_mark_node;
3754 else if (conv2 && (!conv2->bad_p || !conv3))
3756 arg2 = convert_like (conv2, arg2, complain);
3757 arg2 = convert_from_reference (arg2);
3758 arg2_type = TREE_TYPE (arg2);
3759 /* Even if CONV2 is a valid conversion, the result of the
3760 conversion may be invalid. For example, if ARG3 has type
3761 "volatile X", and X does not have a copy constructor
3762 accepting a "volatile X&", then even if ARG2 can be
3763 converted to X, the conversion will fail. */
3764 if (error_operand_p (arg2))
3765 result = error_mark_node;
3767 else if (conv3 && (!conv3->bad_p || !conv2))
3769 arg3 = convert_like (conv3, arg3, complain);
3770 arg3 = convert_from_reference (arg3);
3771 arg3_type = TREE_TYPE (arg3);
3772 if (error_operand_p (arg3))
3773 result = error_mark_node;
3776 /* Free all the conversions we allocated. */
3777 obstack_free (&conversion_obstack, p);
3782 /* If, after the conversion, both operands have class type,
3783 treat the cv-qualification of both operands as if it were the
3784 union of the cv-qualification of the operands.
3786 The standard is not clear about what to do in this
3787 circumstance. For example, if the first operand has type
3788 "const X" and the second operand has a user-defined
3789 conversion to "volatile X", what is the type of the second
3790 operand after this step? Making it be "const X" (matching
3791 the first operand) seems wrong, as that discards the
3792 qualification without actually performing a copy. Leaving it
3793 as "volatile X" seems wrong as that will result in the
3794 conditional expression failing altogether, even though,
3795 according to this step, the one operand could be converted to
3796 the type of the other. */
3797 if ((conv2 || conv3)
3798 && CLASS_TYPE_P (arg2_type)
3799 && TYPE_QUALS (arg2_type) != TYPE_QUALS (arg3_type))
3800 arg2_type = arg3_type =
3801 cp_build_qualified_type (arg2_type,
3802 TYPE_QUALS (arg2_type)
3803 | TYPE_QUALS (arg3_type));
3808 If the second and third operands are lvalues and have the same
3809 type, the result is of that type and is an lvalue. */
3810 if (real_lvalue_p (arg2)
3811 && real_lvalue_p (arg3)
3812 && same_type_p (arg2_type, arg3_type))
3814 result_type = arg2_type;
3815 goto valid_operands;
3820 Otherwise, the result is an rvalue. If the second and third
3821 operand do not have the same type, and either has (possibly
3822 cv-qualified) class type, overload resolution is used to
3823 determine the conversions (if any) to be applied to the operands
3824 (_over.match.oper_, _over.built_). */
3826 if (!same_type_p (arg2_type, arg3_type)
3827 && (CLASS_TYPE_P (arg2_type) || CLASS_TYPE_P (arg3_type)))
3833 /* Rearrange the arguments so that add_builtin_candidate only has
3834 to know about two args. In build_builtin_candidate, the
3835 arguments are unscrambled. */
3839 add_builtin_candidates (&candidates,
3842 ansi_opname (COND_EXPR),
3848 If the overload resolution fails, the program is
3850 candidates = splice_viable (candidates, pedantic, &any_viable_p);
3853 if (complain & tf_error)
3855 op_error (COND_EXPR, NOP_EXPR, arg1, arg2, arg3, "no match");
3856 print_z_candidates (candidates);
3858 return error_mark_node;
3860 cand = tourney (candidates);
3863 if (complain & tf_error)
3865 op_error (COND_EXPR, NOP_EXPR, arg1, arg2, arg3, "no match");
3866 print_z_candidates (candidates);
3868 return error_mark_node;
3873 Otherwise, the conversions thus determined are applied, and
3874 the converted operands are used in place of the original
3875 operands for the remainder of this section. */
3876 conv = cand->convs[0];
3877 arg1 = convert_like (conv, arg1, complain);
3878 conv = cand->convs[1];
3879 arg2 = convert_like (conv, arg2, complain);
3880 arg2_type = TREE_TYPE (arg2);
3881 conv = cand->convs[2];
3882 arg3 = convert_like (conv, arg3, complain);
3883 arg3_type = TREE_TYPE (arg3);
3888 Lvalue-to-rvalue (_conv.lval_), array-to-pointer (_conv.array_),
3889 and function-to-pointer (_conv.func_) standard conversions are
3890 performed on the second and third operands.
3892 We need to force the lvalue-to-rvalue conversion here for class types,
3893 so we get TARGET_EXPRs; trying to deal with a COND_EXPR of class rvalues
3894 that isn't wrapped with a TARGET_EXPR plays havoc with exception
3897 arg2 = force_rvalue (arg2);
3898 if (!CLASS_TYPE_P (arg2_type))
3899 arg2_type = TREE_TYPE (arg2);
3901 arg3 = force_rvalue (arg3);
3902 if (!CLASS_TYPE_P (arg3_type))
3903 arg3_type = TREE_TYPE (arg3);
3905 if (arg2 == error_mark_node || arg3 == error_mark_node)
3906 return error_mark_node;
3910 After those conversions, one of the following shall hold:
3912 --The second and third operands have the same type; the result is of
3914 if (same_type_p (arg2_type, arg3_type))
3915 result_type = arg2_type;
3918 --The second and third operands have arithmetic or enumeration
3919 type; the usual arithmetic conversions are performed to bring
3920 them to a common type, and the result is of that type. */
3921 else if ((ARITHMETIC_TYPE_P (arg2_type)
3922 || UNSCOPED_ENUM_P (arg2_type))
3923 && (ARITHMETIC_TYPE_P (arg3_type)
3924 || UNSCOPED_ENUM_P (arg3_type)))
3926 /* In this case, there is always a common type. */
3927 result_type = type_after_usual_arithmetic_conversions (arg2_type,
3930 if (TREE_CODE (arg2_type) == ENUMERAL_TYPE
3931 && TREE_CODE (arg3_type) == ENUMERAL_TYPE)
3933 if (complain & tf_warning)
3935 "enumeral mismatch in conditional expression: %qT vs %qT",
3936 arg2_type, arg3_type);
3938 else if (extra_warnings
3939 && ((TREE_CODE (arg2_type) == ENUMERAL_TYPE
3940 && !same_type_p (arg3_type, type_promotes_to (arg2_type)))
3941 || (TREE_CODE (arg3_type) == ENUMERAL_TYPE
3942 && !same_type_p (arg2_type, type_promotes_to (arg3_type)))))
3944 if (complain & tf_warning)
3946 "enumeral and non-enumeral type in conditional expression");
3949 arg2 = perform_implicit_conversion (result_type, arg2, complain);
3950 arg3 = perform_implicit_conversion (result_type, arg3, complain);
3954 --The second and third operands have pointer type, or one has
3955 pointer type and the other is a null pointer constant; pointer
3956 conversions (_conv.ptr_) and qualification conversions
3957 (_conv.qual_) are performed to bring them to their composite
3958 pointer type (_expr.rel_). The result is of the composite
3961 --The second and third operands have pointer to member type, or
3962 one has pointer to member type and the other is a null pointer
3963 constant; pointer to member conversions (_conv.mem_) and
3964 qualification conversions (_conv.qual_) are performed to bring
3965 them to a common type, whose cv-qualification shall match the
3966 cv-qualification of either the second or the third operand.
3967 The result is of the common type. */
3968 else if ((null_ptr_cst_p (arg2)
3969 && (TYPE_PTR_P (arg3_type) || TYPE_PTR_TO_MEMBER_P (arg3_type)))
3970 || (null_ptr_cst_p (arg3)
3971 && (TYPE_PTR_P (arg2_type) || TYPE_PTR_TO_MEMBER_P (arg2_type)))
3972 || (TYPE_PTR_P (arg2_type) && TYPE_PTR_P (arg3_type))
3973 || (TYPE_PTRMEM_P (arg2_type) && TYPE_PTRMEM_P (arg3_type))
3974 || (TYPE_PTRMEMFUNC_P (arg2_type) && TYPE_PTRMEMFUNC_P (arg3_type)))
3976 result_type = composite_pointer_type (arg2_type, arg3_type, arg2,
3977 arg3, "conditional expression",
3979 if (result_type == error_mark_node)
3980 return error_mark_node;
3981 arg2 = perform_implicit_conversion (result_type, arg2, complain);
3982 arg3 = perform_implicit_conversion (result_type, arg3, complain);
3987 if (complain & tf_error)
3988 error ("operands to ?: have different types %qT and %qT",
3989 arg2_type, arg3_type);
3990 return error_mark_node;
3994 result = fold_if_not_in_template (build3 (COND_EXPR, result_type, arg1,
3996 /* We can't use result_type below, as fold might have returned a
4001 /* Expand both sides into the same slot, hopefully the target of
4002 the ?: expression. We used to check for TARGET_EXPRs here,
4003 but now we sometimes wrap them in NOP_EXPRs so the test would
4005 if (CLASS_TYPE_P (TREE_TYPE (result)))
4006 result = get_target_expr (result);
4007 /* If this expression is an rvalue, but might be mistaken for an
4008 lvalue, we must add a NON_LVALUE_EXPR. */
4009 result = rvalue (result);
4015 /* OPERAND is an operand to an expression. Perform necessary steps
4016 required before using it. If OPERAND is NULL_TREE, NULL_TREE is
4020 prep_operand (tree operand)
4024 if (CLASS_TYPE_P (TREE_TYPE (operand))
4025 && CLASSTYPE_TEMPLATE_INSTANTIATION (TREE_TYPE (operand)))
4026 /* Make sure the template type is instantiated now. */
4027 instantiate_class_template (TYPE_MAIN_VARIANT (TREE_TYPE (operand)));
4033 /* Add each of the viable functions in FNS (a FUNCTION_DECL or
4034 OVERLOAD) to the CANDIDATES, returning an updated list of
4035 CANDIDATES. The ARGS are the arguments provided to the call,
4036 without any implicit object parameter. This may change ARGS. The
4037 EXPLICIT_TARGS are explicit template arguments provided.
4038 TEMPLATE_ONLY is true if only template functions should be
4039 considered. CONVERSION_PATH, ACCESS_PATH, and FLAGS are as for
4040 add_function_candidate. */
4043 add_candidates (tree fns, const VEC(tree,gc) *args,
4044 tree explicit_targs, bool template_only,
4045 tree conversion_path, tree access_path,
4047 struct z_candidate **candidates)
4050 VEC(tree,gc) *non_static_args;
4053 ctype = conversion_path ? BINFO_TYPE (conversion_path) : NULL_TREE;
4054 /* Delay creating the implicit this parameter until it is needed. */
4055 non_static_args = NULL;
4056 first_arg = NULL_TREE;
4062 const VEC(tree,gc) *fn_args;
4064 fn = OVL_CURRENT (fns);
4065 /* Figure out which set of arguments to use. */
4066 if (DECL_NONSTATIC_MEMBER_FUNCTION_P (fn))
4068 /* If this function is a non-static member, prepend the implicit
4069 object parameter. */
4070 if (non_static_args == NULL)
4075 non_static_args = VEC_alloc (tree, gc,
4076 VEC_length (tree, args) - 1);
4077 for (ix = 1; VEC_iterate (tree, args, ix, arg); ++ix)
4078 VEC_quick_push (tree, non_static_args, arg);
4080 if (first_arg == NULL_TREE)
4081 first_arg = build_this (VEC_index (tree, args, 0));
4082 fn_first_arg = first_arg;
4083 fn_args = non_static_args;
4087 /* Otherwise, just use the list of arguments provided. */
4088 fn_first_arg = NULL_TREE;
4092 if (TREE_CODE (fn) == TEMPLATE_DECL)
4093 add_template_candidate (candidates,
4104 else if (!template_only)
4105 add_function_candidate (candidates,
4113 fns = OVL_NEXT (fns);
4117 /* Even unsigned enum types promote to signed int. We don't want to
4118 issue -Wsign-compare warnings for this case. Here ORIG_ARG is the
4119 original argument and ARG is the argument after any conversions
4120 have been applied. We set TREE_NO_WARNING if we have added a cast
4121 from an unsigned enum type to a signed integer type. */
4124 avoid_sign_compare_warnings (tree orig_arg, tree arg)
4126 if (orig_arg != NULL_TREE
4129 && TREE_CODE (TREE_TYPE (orig_arg)) == ENUMERAL_TYPE
4130 && TYPE_UNSIGNED (TREE_TYPE (orig_arg))
4131 && INTEGRAL_TYPE_P (TREE_TYPE (arg))
4132 && !TYPE_UNSIGNED (TREE_TYPE (arg)))
4133 TREE_NO_WARNING (arg) = 1;
4137 build_new_op (enum tree_code code, int flags, tree arg1, tree arg2, tree arg3,
4138 bool *overloaded_p, tsubst_flags_t complain)
4140 tree orig_arg1 = arg1;
4141 tree orig_arg2 = arg2;
4142 tree orig_arg3 = arg3;
4143 struct z_candidate *candidates = 0, *cand;
4144 VEC(tree,gc) *arglist;
4147 tree result = NULL_TREE;
4148 bool result_valid_p = false;
4149 enum tree_code code2 = NOP_EXPR;
4150 enum tree_code code_orig_arg1 = ERROR_MARK;
4151 enum tree_code code_orig_arg2 = ERROR_MARK;
4157 if (error_operand_p (arg1)
4158 || error_operand_p (arg2)
4159 || error_operand_p (arg3))
4160 return error_mark_node;
4162 if (code == MODIFY_EXPR)
4164 code2 = TREE_CODE (arg3);
4166 fnname = ansi_assopname (code2);
4169 fnname = ansi_opname (code);
4171 arg1 = prep_operand (arg1);
4177 case VEC_DELETE_EXPR:
4179 /* Use build_op_new_call and build_op_delete_call instead. */
4183 /* Use build_op_call instead. */
4186 case TRUTH_ORIF_EXPR:
4187 case TRUTH_ANDIF_EXPR:
4188 case TRUTH_AND_EXPR:
4190 /* These are saved for the sake of warn_logical_operator. */
4191 code_orig_arg1 = TREE_CODE (arg1);
4192 code_orig_arg2 = TREE_CODE (arg2);
4198 arg2 = prep_operand (arg2);
4199 arg3 = prep_operand (arg3);
4201 if (code == COND_EXPR)
4202 /* Use build_conditional_expr instead. */
4204 else if (! IS_OVERLOAD_TYPE (TREE_TYPE (arg1))
4205 && (! arg2 || ! IS_OVERLOAD_TYPE (TREE_TYPE (arg2))))
4208 if (code == POSTINCREMENT_EXPR || code == POSTDECREMENT_EXPR)
4209 arg2 = integer_zero_node;
4211 arglist = VEC_alloc (tree, gc, 3);
4212 VEC_quick_push (tree, arglist, arg1);
4213 if (arg2 != NULL_TREE)
4214 VEC_quick_push (tree, arglist, arg2);
4215 if (arg3 != NULL_TREE)
4216 VEC_quick_push (tree, arglist, arg3);
4218 /* Get the high-water mark for the CONVERSION_OBSTACK. */
4219 p = conversion_obstack_alloc (0);
4221 /* Add namespace-scope operators to the list of functions to
4223 add_candidates (lookup_function_nonclass (fnname, arglist, /*block_p=*/true),
4224 arglist, NULL_TREE, false, NULL_TREE, NULL_TREE,
4225 flags, &candidates);
4226 /* Add class-member operators to the candidate set. */
4227 if (CLASS_TYPE_P (TREE_TYPE (arg1)))
4231 fns = lookup_fnfields (TREE_TYPE (arg1), fnname, 1);
4232 if (fns == error_mark_node)
4234 result = error_mark_node;
4235 goto user_defined_result_ready;
4238 add_candidates (BASELINK_FUNCTIONS (fns), arglist,
4240 BASELINK_BINFO (fns),
4241 TYPE_BINFO (TREE_TYPE (arg1)),
4242 flags, &candidates);
4247 args[2] = NULL_TREE;
4249 add_builtin_candidates (&candidates, code, code2, fnname, args, flags);
4255 /* For these, the built-in candidates set is empty
4256 [over.match.oper]/3. We don't want non-strict matches
4257 because exact matches are always possible with built-in
4258 operators. The built-in candidate set for COMPONENT_REF
4259 would be empty too, but since there are no such built-in
4260 operators, we accept non-strict matches for them. */
4265 strict_p = pedantic;
4269 candidates = splice_viable (candidates, strict_p, &any_viable_p);
4274 case POSTINCREMENT_EXPR:
4275 case POSTDECREMENT_EXPR:
4276 /* Don't try anything fancy if we're not allowed to produce
4278 if (!(complain & tf_error))
4279 return error_mark_node;
4281 /* Look for an `operator++ (int)'. Pre-1985 C++ didn't
4282 distinguish between prefix and postfix ++ and
4283 operator++() was used for both, so we allow this with
4285 if (flags & LOOKUP_COMPLAIN)
4287 const char *msg = (flag_permissive)
4288 ? G_("no %<%D(int)%> declared for postfix %qs,"
4289 " trying prefix operator instead")
4290 : G_("no %<%D(int)%> declared for postfix %qs");
4291 permerror (input_location, msg, fnname,
4292 operator_name_info[code].name);
4295 if (!flag_permissive)
4296 return error_mark_node;
4298 if (code == POSTINCREMENT_EXPR)
4299 code = PREINCREMENT_EXPR;
4301 code = PREDECREMENT_EXPR;
4302 result = build_new_op (code, flags, arg1, NULL_TREE, NULL_TREE,
4303 overloaded_p, complain);
4306 /* The caller will deal with these. */
4311 result_valid_p = true;
4315 if ((flags & LOOKUP_COMPLAIN) && (complain & tf_error))
4317 /* If one of the arguments of the operator represents
4318 an invalid use of member function pointer, try to report
4319 a meaningful error ... */
4320 if (invalid_nonstatic_memfn_p (arg1, tf_error)
4321 || invalid_nonstatic_memfn_p (arg2, tf_error)
4322 || invalid_nonstatic_memfn_p (arg3, tf_error))
4323 /* We displayed the error message. */;
4326 /* ... Otherwise, report the more generic
4327 "no matching operator found" error */
4328 op_error (code, code2, arg1, arg2, arg3, "no match");
4329 print_z_candidates (candidates);
4332 result = error_mark_node;
4338 cand = tourney (candidates);
4341 if ((flags & LOOKUP_COMPLAIN) && (complain & tf_error))
4343 op_error (code, code2, arg1, arg2, arg3, "ambiguous overload");
4344 print_z_candidates (candidates);
4346 result = error_mark_node;
4348 else if (TREE_CODE (cand->fn) == FUNCTION_DECL)
4351 *overloaded_p = true;
4353 if (resolve_args (arglist) == NULL)
4354 result = error_mark_node;
4356 result = build_over_call (cand, LOOKUP_NORMAL, complain);
4360 /* Give any warnings we noticed during overload resolution. */
4361 if (cand->warnings && (complain & tf_warning))
4363 struct candidate_warning *w;
4364 for (w = cand->warnings; w; w = w->next)
4365 joust (cand, w->loser, 1);
4368 /* Check for comparison of different enum types. */
4377 if (TREE_CODE (TREE_TYPE (arg1)) == ENUMERAL_TYPE
4378 && TREE_CODE (TREE_TYPE (arg2)) == ENUMERAL_TYPE
4379 && (TYPE_MAIN_VARIANT (TREE_TYPE (arg1))
4380 != TYPE_MAIN_VARIANT (TREE_TYPE (arg2)))
4381 && (complain & tf_warning))
4383 warning (OPT_Wenum_compare,
4384 "comparison between %q#T and %q#T",
4385 TREE_TYPE (arg1), TREE_TYPE (arg2));
4392 /* We need to strip any leading REF_BIND so that bitfields
4393 don't cause errors. This should not remove any important
4394 conversions, because builtins don't apply to class
4395 objects directly. */
4396 conv = cand->convs[0];
4397 if (conv->kind == ck_ref_bind)
4398 conv = conv->u.next;
4399 arg1 = convert_like (conv, arg1, complain);
4403 /* We need to call warn_logical_operator before
4404 converting arg2 to a boolean_type. */
4405 if (complain & tf_warning)
4406 warn_logical_operator (input_location, code, boolean_type_node,
4407 code_orig_arg1, arg1,
4408 code_orig_arg2, arg2);
4410 conv = cand->convs[1];
4411 if (conv->kind == ck_ref_bind)
4412 conv = conv->u.next;
4413 arg2 = convert_like (conv, arg2, complain);
4417 conv = cand->convs[2];
4418 if (conv->kind == ck_ref_bind)
4419 conv = conv->u.next;
4420 arg3 = convert_like (conv, arg3, complain);
4426 user_defined_result_ready:
4428 /* Free all the conversions we allocated. */
4429 obstack_free (&conversion_obstack, p);
4431 if (result || result_valid_p)
4435 avoid_sign_compare_warnings (orig_arg1, arg1);
4436 avoid_sign_compare_warnings (orig_arg2, arg2);
4437 avoid_sign_compare_warnings (orig_arg3, arg3);
4442 return cp_build_modify_expr (arg1, code2, arg2, complain);
4445 return cp_build_indirect_ref (arg1, "unary *", complain);
4447 case TRUTH_ANDIF_EXPR:
4448 case TRUTH_ORIF_EXPR:
4449 case TRUTH_AND_EXPR:
4451 warn_logical_operator (input_location, code, boolean_type_node,
4452 code_orig_arg1, arg1, code_orig_arg2, arg2);
4457 case TRUNC_DIV_EXPR:
4468 case TRUNC_MOD_EXPR:
4472 return cp_build_binary_op (input_location, code, arg1, arg2, complain);
4474 case UNARY_PLUS_EXPR:
4477 case TRUTH_NOT_EXPR:
4478 case PREINCREMENT_EXPR:
4479 case POSTINCREMENT_EXPR:
4480 case PREDECREMENT_EXPR:
4481 case POSTDECREMENT_EXPR:
4484 return cp_build_unary_op (code, arg1, candidates != 0, complain);
4487 return build_array_ref (input_location, arg1, arg2);
4490 return build_m_component_ref (cp_build_indirect_ref (arg1, NULL,
4494 /* The caller will deal with these. */
4506 /* Returns true iff T, an element of an OVERLOAD chain, is a usual
4507 deallocation function (3.7.4.2 [basic.stc.dynamic.deallocation]). */
4510 non_placement_deallocation_fn_p (tree t)
4512 /* A template instance is never a usual deallocation function,
4513 regardless of its signature. */
4514 if (TREE_CODE (t) == TEMPLATE_DECL
4515 || primary_template_instantiation_p (t))
4518 /* If a class T has a member deallocation function named operator delete
4519 with exactly one parameter, then that function is a usual
4520 (non-placement) deallocation function. If class T does not declare
4521 such an operator delete but does declare a member deallocation
4522 function named operator delete with exactly two parameters, the second
4523 of which has type std::size_t (18.2), then this function is a usual
4524 deallocation function. */
4525 t = FUNCTION_ARG_CHAIN (t);
4526 if (t == void_list_node
4527 || (t && same_type_p (TREE_VALUE (t), size_type_node)
4528 && TREE_CHAIN (t) == void_list_node))
4533 /* Build a call to operator delete. This has to be handled very specially,
4534 because the restrictions on what signatures match are different from all
4535 other call instances. For a normal delete, only a delete taking (void *)
4536 or (void *, size_t) is accepted. For a placement delete, only an exact
4537 match with the placement new is accepted.
4539 CODE is either DELETE_EXPR or VEC_DELETE_EXPR.
4540 ADDR is the pointer to be deleted.
4541 SIZE is the size of the memory block to be deleted.
4542 GLOBAL_P is true if the delete-expression should not consider
4543 class-specific delete operators.
4544 PLACEMENT is the corresponding placement new call, or NULL_TREE.
4546 If this call to "operator delete" is being generated as part to
4547 deallocate memory allocated via a new-expression (as per [expr.new]
4548 which requires that if the initialization throws an exception then
4549 we call a deallocation function), then ALLOC_FN is the allocation
4553 build_op_delete_call (enum tree_code code, tree addr, tree size,
4554 bool global_p, tree placement,
4557 tree fn = NULL_TREE;
4558 tree fns, fnname, type, t;
4560 if (addr == error_mark_node)
4561 return error_mark_node;
4563 type = strip_array_types (TREE_TYPE (TREE_TYPE (addr)));
4565 fnname = ansi_opname (code);
4567 if (CLASS_TYPE_P (type)
4568 && COMPLETE_TYPE_P (complete_type (type))
4572 If the result of the lookup is ambiguous or inaccessible, or if
4573 the lookup selects a placement deallocation function, the
4574 program is ill-formed.
4576 Therefore, we ask lookup_fnfields to complain about ambiguity. */
4578 fns = lookup_fnfields (TYPE_BINFO (type), fnname, 1);
4579 if (fns == error_mark_node)
4580 return error_mark_node;
4585 if (fns == NULL_TREE)
4586 fns = lookup_name_nonclass (fnname);
4588 /* Strip const and volatile from addr. */
4589 addr = cp_convert (ptr_type_node, addr);
4593 /* "A declaration of a placement deallocation function matches the
4594 declaration of a placement allocation function if it has the same
4595 number of parameters and, after parameter transformations (8.3.5),
4596 all parameter types except the first are identical."
4598 So we build up the function type we want and ask instantiate_type
4599 to get it for us. */
4600 t = FUNCTION_ARG_CHAIN (alloc_fn);
4601 t = tree_cons (NULL_TREE, ptr_type_node, t);
4602 t = build_function_type (void_type_node, t);
4604 fn = instantiate_type (t, fns, tf_none);
4605 if (fn == error_mark_node)
4608 if (BASELINK_P (fn))
4609 fn = BASELINK_FUNCTIONS (fn);
4611 /* "If the lookup finds the two-parameter form of a usual deallocation
4612 function (3.7.4.2) and that function, considered as a placement
4613 deallocation function, would have been selected as a match for the
4614 allocation function, the program is ill-formed." */
4615 if (non_placement_deallocation_fn_p (fn))
4616 error ("non-placement deallocation function %qD selected for "
4617 "placement delete", fn);
4620 /* "Any non-placement deallocation function matches a non-placement
4621 allocation function. If the lookup finds a single matching
4622 deallocation function, that function will be called; otherwise, no
4623 deallocation function will be called." */
4624 for (t = BASELINK_P (fns) ? BASELINK_FUNCTIONS (fns) : fns;
4625 t; t = OVL_NEXT (t))
4627 tree elt = OVL_CURRENT (t);
4628 if (non_placement_deallocation_fn_p (elt))
4631 /* "If a class T has a member deallocation function named
4632 operator delete with exactly one parameter, then that
4633 function is a usual (non-placement) deallocation
4634 function. If class T does not declare such an operator
4635 delete but does declare a member deallocation function named
4636 operator delete with exactly two parameters, the second of
4637 which has type std::size_t (18.2), then this function is a
4638 usual deallocation function."
4640 So (void*) beats (void*, size_t). */
4641 if (FUNCTION_ARG_CHAIN (fn) == void_list_node)
4646 /* If we have a matching function, call it. */
4649 gcc_assert (TREE_CODE (fn) == FUNCTION_DECL);
4651 /* If the FN is a member function, make sure that it is
4653 if (BASELINK_P (fns))
4654 perform_or_defer_access_check (BASELINK_BINFO (fns), fn, fn);
4656 /* Core issue 901: It's ok to new a type with deleted delete. */
4657 if (DECL_DELETED_FN (fn) && alloc_fn)
4662 /* The placement args might not be suitable for overload
4663 resolution at this point, so build the call directly. */
4664 int nargs = call_expr_nargs (placement);
4665 tree *argarray = (tree *) alloca (nargs * sizeof (tree));
4668 for (i = 1; i < nargs; i++)
4669 argarray[i] = CALL_EXPR_ARG (placement, i);
4671 return build_cxx_call (fn, nargs, argarray);
4676 VEC(tree,gc) *args = VEC_alloc (tree, gc, 2);
4677 VEC_quick_push (tree, args, addr);
4678 if (FUNCTION_ARG_CHAIN (fn) != void_list_node)
4679 VEC_quick_push (tree, args, size);
4680 ret = cp_build_function_call_vec (fn, &args, tf_warning_or_error);
4681 VEC_free (tree, gc, args);
4688 If no unambiguous matching deallocation function can be found,
4689 propagating the exception does not cause the object's memory to
4694 warning (0, "no corresponding deallocation function for %qD",
4699 error ("no suitable %<operator %s%> for %qT",
4700 operator_name_info[(int)code].name, type);
4701 return error_mark_node;
4704 /* If the current scope isn't allowed to access DECL along
4705 BASETYPE_PATH, give an error. The most derived class in
4706 BASETYPE_PATH is the one used to qualify DECL. DIAG_DECL is
4707 the declaration to use in the error diagnostic. */
4710 enforce_access (tree basetype_path, tree decl, tree diag_decl)
4712 gcc_assert (TREE_CODE (basetype_path) == TREE_BINFO);
4714 if (!accessible_p (basetype_path, decl, true))
4716 if (TREE_PRIVATE (decl))
4717 error ("%q+#D is private", diag_decl);
4718 else if (TREE_PROTECTED (decl))
4719 error ("%q+#D is protected", diag_decl);
4721 error ("%q+#D is inaccessible", diag_decl);
4722 error ("within this context");
4729 /* Initialize a temporary of type TYPE with EXPR. The FLAGS are a
4730 bitwise or of LOOKUP_* values. If any errors are warnings are
4731 generated, set *DIAGNOSTIC_FN to "error" or "warning",
4732 respectively. If no diagnostics are generated, set *DIAGNOSTIC_FN
4736 build_temp (tree expr, tree type, int flags,
4737 diagnostic_t *diagnostic_kind)
4742 savew = warningcount, savee = errorcount;
4743 args = make_tree_vector_single (expr);
4744 expr = build_special_member_call (NULL_TREE, complete_ctor_identifier,
4745 &args, type, flags, tf_warning_or_error);
4746 release_tree_vector (args);
4747 if (warningcount > savew)
4748 *diagnostic_kind = DK_WARNING;
4749 else if (errorcount > savee)
4750 *diagnostic_kind = DK_ERROR;
4752 *diagnostic_kind = DK_UNSPECIFIED;
4756 /* Perform warnings about peculiar, but valid, conversions from/to NULL.
4757 EXPR is implicitly converted to type TOTYPE.
4758 FN and ARGNUM are used for diagnostics. */
4761 conversion_null_warnings (tree totype, tree expr, tree fn, int argnum)
4763 tree t = non_reference (totype);
4765 /* Issue warnings about peculiar, but valid, uses of NULL. */
4766 if (expr == null_node && TREE_CODE (t) != BOOLEAN_TYPE && ARITHMETIC_TYPE_P (t))
4769 warning (OPT_Wconversion, "passing NULL to non-pointer argument %P of %qD",
4772 warning (OPT_Wconversion, "converting to non-pointer type %qT from NULL", t);
4775 /* Issue warnings if "false" is converted to a NULL pointer */
4776 else if (expr == boolean_false_node && fn && POINTER_TYPE_P (t))
4777 warning (OPT_Wconversion,
4778 "converting %<false%> to pointer type for argument %P of %qD",
4782 /* Perform the conversions in CONVS on the expression EXPR. FN and
4783 ARGNUM are used for diagnostics. ARGNUM is zero based, -1
4784 indicates the `this' argument of a method. INNER is nonzero when
4785 being called to continue a conversion chain. It is negative when a
4786 reference binding will be applied, positive otherwise. If
4787 ISSUE_CONVERSION_WARNINGS is true, warnings about suspicious
4788 conversions will be emitted if appropriate. If C_CAST_P is true,
4789 this conversion is coming from a C-style cast; in that case,
4790 conversions to inaccessible bases are permitted. */
4793 convert_like_real (conversion *convs, tree expr, tree fn, int argnum,
4794 int inner, bool issue_conversion_warnings,
4795 bool c_cast_p, tsubst_flags_t complain)
4797 tree totype = convs->type;
4798 diagnostic_t diag_kind;
4802 && convs->kind != ck_user
4803 && convs->kind != ck_list
4804 && convs->kind != ck_ambig
4805 && convs->kind != ck_ref_bind
4806 && convs->kind != ck_rvalue
4807 && convs->kind != ck_base)
4809 conversion *t = convs;
4811 /* Give a helpful error if this is bad because of excess braces. */
4812 if (BRACE_ENCLOSED_INITIALIZER_P (expr)
4813 && SCALAR_TYPE_P (totype)
4814 && CONSTRUCTOR_NELTS (expr) > 0
4815 && BRACE_ENCLOSED_INITIALIZER_P (CONSTRUCTOR_ELT (expr, 0)->value))
4816 permerror (input_location, "too many braces around initializer for %qT", totype);
4818 for (; t; t = convs->u.next)
4820 if (t->kind == ck_user || !t->bad_p)
4822 expr = convert_like_real (t, expr, fn, argnum, 1,
4823 /*issue_conversion_warnings=*/false,
4828 else if (t->kind == ck_ambig)
4829 return convert_like_real (t, expr, fn, argnum, 1,
4830 /*issue_conversion_warnings=*/false,
4833 else if (t->kind == ck_identity)
4836 if (complain & tf_error)
4838 permerror (input_location, "invalid conversion from %qT to %qT", TREE_TYPE (expr), totype);
4840 permerror (input_location, " initializing argument %P of %qD", argnum, fn);
4843 return error_mark_node;
4845 return cp_convert (totype, expr);
4848 if (issue_conversion_warnings && (complain & tf_warning))
4849 conversion_null_warnings (totype, expr, fn, argnum);
4851 switch (convs->kind)
4855 struct z_candidate *cand = convs->cand;
4856 tree convfn = cand->fn;
4859 /* When converting from an init list we consider explicit
4860 constructors, but actually trying to call one is an error. */
4861 if (DECL_NONCONVERTING_P (convfn) && DECL_CONSTRUCTOR_P (convfn))
4863 if (complain & tf_error)
4864 error ("converting to %qT from initializer list would use "
4865 "explicit constructor %qD", totype, convfn);
4867 return error_mark_node;
4870 /* Set user_conv_p on the argument conversions, so rvalue/base
4871 handling knows not to allow any more UDCs. */
4872 for (i = 0; i < cand->num_convs; ++i)
4873 cand->convs[i]->user_conv_p = true;
4875 expr = build_over_call (cand, LOOKUP_NORMAL, complain);
4877 /* If this is a constructor or a function returning an aggr type,
4878 we need to build up a TARGET_EXPR. */
4879 if (DECL_CONSTRUCTOR_P (convfn))
4881 expr = build_cplus_new (totype, expr);
4883 /* Remember that this was list-initialization. */
4884 if (convs->check_narrowing)
4885 TARGET_EXPR_LIST_INIT_P (expr) = true;
4891 if (BRACE_ENCLOSED_INITIALIZER_P (expr))
4893 int nelts = CONSTRUCTOR_NELTS (expr);
4895 expr = integer_zero_node;
4896 else if (nelts == 1)
4897 expr = CONSTRUCTOR_ELT (expr, 0)->value;
4902 if (type_unknown_p (expr))
4903 expr = instantiate_type (totype, expr, complain);
4904 /* Convert a constant to its underlying value, unless we are
4905 about to bind it to a reference, in which case we need to
4906 leave it as an lvalue. */
4909 expr = decl_constant_value (expr);
4910 if (expr == null_node && INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (totype))
4911 /* If __null has been converted to an integer type, we do not
4912 want to warn about uses of EXPR as an integer, rather than
4914 expr = build_int_cst (totype, 0);
4918 /* Call build_user_type_conversion again for the error. */
4919 return build_user_type_conversion
4920 (totype, convs->u.expr, LOOKUP_NORMAL);
4924 /* Conversion to std::initializer_list<T>. */
4925 tree elttype = TREE_VEC_ELT (CLASSTYPE_TI_ARGS (totype), 0);
4926 tree new_ctor = build_constructor (init_list_type_node, NULL);
4927 unsigned len = CONSTRUCTOR_NELTS (expr);
4929 VEC(tree,gc) *parms;
4932 /* Convert all the elements. */
4933 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (expr), ix, val)
4935 tree sub = convert_like_real (convs->u.list[ix], val, fn, argnum,
4936 1, false, false, complain);
4937 if (sub == error_mark_node)
4939 check_narrowing (TREE_TYPE (sub), val);
4940 CONSTRUCTOR_APPEND_ELT (CONSTRUCTOR_ELTS (new_ctor), NULL_TREE, sub);
4942 /* Build up the array. */
4943 elttype = cp_build_qualified_type
4944 (elttype, TYPE_QUALS (elttype) | TYPE_QUAL_CONST);
4945 array = build_array_of_n_type (elttype, len);
4946 array = finish_compound_literal (array, new_ctor);
4948 parms = make_tree_vector ();
4949 VEC_safe_push (tree, gc, parms, decay_conversion (array));
4950 VEC_safe_push (tree, gc, parms, size_int (len));
4951 /* Call the private constructor. */
4952 push_deferring_access_checks (dk_no_check);
4953 new_ctor = build_special_member_call
4954 (NULL_TREE, complete_ctor_identifier, &parms, totype, 0, complain);
4955 release_tree_vector (parms);
4956 pop_deferring_access_checks ();
4957 return build_cplus_new (totype, new_ctor);
4961 return get_target_expr (digest_init (totype, expr));
4967 expr = convert_like_real (convs->u.next, expr, fn, argnum,
4968 convs->kind == ck_ref_bind ? -1 : 1,
4969 convs->kind == ck_ref_bind ? issue_conversion_warnings : false,
4972 if (expr == error_mark_node)
4973 return error_mark_node;
4975 switch (convs->kind)
4978 expr = convert_bitfield_to_declared_type (expr);
4979 if (! MAYBE_CLASS_TYPE_P (totype))
4981 /* Else fall through. */
4983 if (convs->kind == ck_base && !convs->need_temporary_p)
4985 /* We are going to bind a reference directly to a base-class
4986 subobject of EXPR. */
4987 /* Build an expression for `*((base*) &expr)'. */
4988 expr = cp_build_unary_op (ADDR_EXPR, expr, 0, complain);
4989 expr = convert_to_base (expr, build_pointer_type (totype),
4990 !c_cast_p, /*nonnull=*/true);
4991 expr = cp_build_indirect_ref (expr, "implicit conversion", complain);
4995 /* Copy-initialization where the cv-unqualified version of the source
4996 type is the same class as, or a derived class of, the class of the
4997 destination [is treated as direct-initialization]. [dcl.init] */
4998 flags = LOOKUP_NORMAL|LOOKUP_ONLYCONVERTING;
4999 if (convs->user_conv_p)
5000 /* This conversion is being done in the context of a user-defined
5001 conversion (i.e. the second step of copy-initialization), so
5002 don't allow any more. */
5003 flags |= LOOKUP_NO_CONVERSION;
5004 expr = build_temp (expr, totype, flags, &diag_kind);
5005 if (diag_kind && fn)
5007 if ((complain & tf_error))
5008 emit_diagnostic (diag_kind, input_location, 0,
5009 " initializing argument %P of %qD", argnum, fn);
5010 else if (diag_kind == DK_ERROR)
5011 return error_mark_node;
5013 return build_cplus_new (totype, expr);
5017 tree ref_type = totype;
5019 if (convs->bad_p && TYPE_REF_IS_RVALUE (ref_type)
5020 && real_lvalue_p (expr))
5022 if (complain & tf_error)
5024 error ("cannot bind %qT lvalue to %qT",
5025 TREE_TYPE (expr), totype);
5027 error (" initializing argument %P of %q+D", argnum, fn);
5029 return error_mark_node;
5032 /* If necessary, create a temporary.
5034 VA_ARG_EXPR and CONSTRUCTOR expressions are special cases
5035 that need temporaries, even when their types are reference
5036 compatible with the type of reference being bound, so the
5037 upcoming call to cp_build_unary_op (ADDR_EXPR, expr, ...)
5039 if (convs->need_temporary_p
5040 || TREE_CODE (expr) == CONSTRUCTOR
5041 || TREE_CODE (expr) == VA_ARG_EXPR)
5043 tree type = convs->u.next->type;
5044 cp_lvalue_kind lvalue = real_lvalue_p (expr);
5046 if (!CP_TYPE_CONST_NON_VOLATILE_P (TREE_TYPE (ref_type))
5047 && !TYPE_REF_IS_RVALUE (ref_type))
5049 if (complain & tf_error)
5051 /* If the reference is volatile or non-const, we
5052 cannot create a temporary. */
5053 if (lvalue & clk_bitfield)
5054 error ("cannot bind bitfield %qE to %qT",
5056 else if (lvalue & clk_packed)
5057 error ("cannot bind packed field %qE to %qT",
5060 error ("cannot bind rvalue %qE to %qT", expr, ref_type);
5062 return error_mark_node;
5064 /* If the source is a packed field, and we must use a copy
5065 constructor, then building the target expr will require
5066 binding the field to the reference parameter to the
5067 copy constructor, and we'll end up with an infinite
5068 loop. If we can use a bitwise copy, then we'll be
5070 if ((lvalue & clk_packed)
5071 && CLASS_TYPE_P (type)
5072 && !TYPE_HAS_TRIVIAL_INIT_REF (type))
5074 if (complain & tf_error)
5075 error ("cannot bind packed field %qE to %qT",
5077 return error_mark_node;
5079 if (lvalue & clk_bitfield)
5081 expr = convert_bitfield_to_declared_type (expr);
5082 expr = fold_convert (type, expr);
5084 expr = build_target_expr_with_type (expr, type);
5087 /* Take the address of the thing to which we will bind the
5089 expr = cp_build_unary_op (ADDR_EXPR, expr, 1, complain);
5090 if (expr == error_mark_node)
5091 return error_mark_node;
5093 /* Convert it to a pointer to the type referred to by the
5094 reference. This will adjust the pointer if a derived to
5095 base conversion is being performed. */
5096 expr = cp_convert (build_pointer_type (TREE_TYPE (ref_type)),
5098 /* Convert the pointer to the desired reference type. */
5099 return build_nop (ref_type, expr);
5103 return decay_conversion (expr);
5106 /* Warn about deprecated conversion if appropriate. */
5107 string_conv_p (totype, expr, 1);
5112 expr = convert_to_base (expr, totype, !c_cast_p,
5114 return build_nop (totype, expr);
5117 return convert_ptrmem (totype, expr, /*allow_inverse_p=*/false,
5124 if (convs->check_narrowing)
5125 check_narrowing (totype, expr);
5127 if (issue_conversion_warnings && (complain & tf_warning))
5128 expr = convert_and_check (totype, expr);
5130 expr = convert (totype, expr);
5135 /* ARG is being passed to a varargs function. Perform any conversions
5136 required. Return the converted value. */
5139 convert_arg_to_ellipsis (tree arg)
5143 The lvalue-to-rvalue, array-to-pointer, and function-to-pointer
5144 standard conversions are performed. */
5145 arg = decay_conversion (arg);
5148 If the argument has integral or enumeration type that is subject
5149 to the integral promotions (_conv.prom_), or a floating point
5150 type that is subject to the floating point promotion
5151 (_conv.fpprom_), the value of the argument is converted to the
5152 promoted type before the call. */
5153 if (TREE_CODE (TREE_TYPE (arg)) == REAL_TYPE
5154 && (TYPE_PRECISION (TREE_TYPE (arg))
5155 < TYPE_PRECISION (double_type_node))
5156 && !DECIMAL_FLOAT_MODE_P (TYPE_MODE (TREE_TYPE (arg))))
5157 arg = convert_to_real (double_type_node, arg);
5158 else if (INTEGRAL_OR_ENUMERATION_TYPE_P (TREE_TYPE (arg)))
5159 arg = perform_integral_promotions (arg);
5161 arg = require_complete_type (arg);
5163 if (arg != error_mark_node
5164 && (type_has_nontrivial_copy_init (TREE_TYPE (arg))
5165 || TYPE_HAS_NONTRIVIAL_DESTRUCTOR (TREE_TYPE (arg))))
5167 /* [expr.call] 5.2.2/7:
5168 Passing a potentially-evaluated argument of class type (Clause 9)
5169 with a non-trivial copy constructor or a non-trivial destructor
5170 with no corresponding parameter is conditionally-supported, with
5171 implementation-defined semantics.
5173 We used to just warn here and do a bitwise copy, but now
5174 cp_expr_size will abort if we try to do that.
5176 If the call appears in the context of a sizeof expression,
5177 it is not potentially-evaluated. */
5178 if (cp_unevaluated_operand == 0)
5179 error ("cannot pass objects of non-trivially-copyable "
5180 "type %q#T through %<...%>", TREE_TYPE (arg));
5186 /* va_arg (EXPR, TYPE) is a builtin. Make sure it is not abused. */
5189 build_x_va_arg (tree expr, tree type)
5191 if (processing_template_decl)
5192 return build_min (VA_ARG_EXPR, type, expr);
5194 type = complete_type_or_else (type, NULL_TREE);
5196 if (expr == error_mark_node || !type)
5197 return error_mark_node;
5199 if (type_has_nontrivial_copy_init (type)
5200 || TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type)
5201 || TREE_CODE (type) == REFERENCE_TYPE)
5203 /* Remove reference types so we don't ICE later on. */
5204 tree type1 = non_reference (type);
5205 /* conditionally-supported behavior [expr.call] 5.2.2/7. */
5206 error ("cannot receive objects of non-trivially-copyable type %q#T "
5207 "through %<...%>; ", type);
5208 expr = convert (build_pointer_type (type1), null_node);
5209 expr = cp_build_indirect_ref (expr, NULL, tf_warning_or_error);
5213 return build_va_arg (input_location, expr, type);
5216 /* TYPE has been given to va_arg. Apply the default conversions which
5217 would have happened when passed via ellipsis. Return the promoted
5218 type, or the passed type if there is no change. */
5221 cxx_type_promotes_to (tree type)
5225 /* Perform the array-to-pointer and function-to-pointer
5227 type = type_decays_to (type);
5229 promote = type_promotes_to (type);
5230 if (same_type_p (type, promote))
5236 /* ARG is a default argument expression being passed to a parameter of
5237 the indicated TYPE, which is a parameter to FN. Do any required
5238 conversions. Return the converted value. */
5240 static GTY(()) VEC(tree,gc) *default_arg_context;
5243 convert_default_arg (tree type, tree arg, tree fn, int parmnum)
5248 /* If the ARG is an unparsed default argument expression, the
5249 conversion cannot be performed. */
5250 if (TREE_CODE (arg) == DEFAULT_ARG)
5252 error ("the default argument for parameter %d of %qD has "
5253 "not yet been parsed",
5255 return error_mark_node;
5258 /* Detect recursion. */
5259 for (i = 0; VEC_iterate (tree, default_arg_context, i, t); ++i)
5262 error ("recursive evaluation of default argument for %q#D", fn);
5263 return error_mark_node;
5265 VEC_safe_push (tree, gc, default_arg_context, fn);
5267 if (fn && DECL_TEMPLATE_INFO (fn))
5268 arg = tsubst_default_argument (fn, type, arg);
5274 The names in the expression are bound, and the semantic
5275 constraints are checked, at the point where the default
5276 expressions appears.
5278 we must not perform access checks here. */
5279 push_deferring_access_checks (dk_no_check);
5280 arg = break_out_target_exprs (arg);
5281 if (TREE_CODE (arg) == CONSTRUCTOR)
5283 arg = digest_init (type, arg);
5284 arg = convert_for_initialization (0, type, arg, LOOKUP_NORMAL,
5285 "default argument", fn, parmnum,
5286 tf_warning_or_error);
5290 /* We must make a copy of ARG, in case subsequent processing
5291 alters any part of it. For example, during gimplification a
5292 cast of the form (T) &X::f (where "f" is a member function)
5293 will lead to replacing the PTRMEM_CST for &X::f with a
5294 VAR_DECL. We can avoid the copy for constants, since they
5295 are never modified in place. */
5296 if (!CONSTANT_CLASS_P (arg))
5297 arg = unshare_expr (arg);
5298 arg = convert_for_initialization (0, type, arg, LOOKUP_NORMAL,
5299 "default argument", fn, parmnum,
5300 tf_warning_or_error);
5301 arg = convert_for_arg_passing (type, arg);
5303 pop_deferring_access_checks();
5305 VEC_pop (tree, default_arg_context);
5310 /* Returns the type which will really be used for passing an argument of
5314 type_passed_as (tree type)
5316 /* Pass classes with copy ctors by invisible reference. */
5317 if (TREE_ADDRESSABLE (type))
5319 type = build_reference_type (type);
5320 /* There are no other pointers to this temporary. */
5321 type = build_qualified_type (type, TYPE_QUAL_RESTRICT);
5323 else if (targetm.calls.promote_prototypes (type)
5324 && INTEGRAL_TYPE_P (type)
5325 && COMPLETE_TYPE_P (type)
5326 && INT_CST_LT_UNSIGNED (TYPE_SIZE (type),
5327 TYPE_SIZE (integer_type_node)))
5328 type = integer_type_node;
5333 /* Actually perform the appropriate conversion. */
5336 convert_for_arg_passing (tree type, tree val)
5340 /* If VAL is a bitfield, then -- since it has already been converted
5341 to TYPE -- it cannot have a precision greater than TYPE.
5343 If it has a smaller precision, we must widen it here. For
5344 example, passing "int f:3;" to a function expecting an "int" will
5345 not result in any conversion before this point.
5347 If the precision is the same we must not risk widening. For
5348 example, the COMPONENT_REF for a 32-bit "long long" bitfield will
5349 often have type "int", even though the C++ type for the field is
5350 "long long". If the value is being passed to a function
5351 expecting an "int", then no conversions will be required. But,
5352 if we call convert_bitfield_to_declared_type, the bitfield will
5353 be converted to "long long". */
5354 bitfield_type = is_bitfield_expr_with_lowered_type (val);
5356 && TYPE_PRECISION (TREE_TYPE (val)) < TYPE_PRECISION (type))
5357 val = convert_to_integer (TYPE_MAIN_VARIANT (bitfield_type), val);
5359 if (val == error_mark_node)
5361 /* Pass classes with copy ctors by invisible reference. */
5362 else if (TREE_ADDRESSABLE (type))
5363 val = build1 (ADDR_EXPR, build_reference_type (type), val);
5364 else if (targetm.calls.promote_prototypes (type)
5365 && INTEGRAL_TYPE_P (type)
5366 && COMPLETE_TYPE_P (type)
5367 && INT_CST_LT_UNSIGNED (TYPE_SIZE (type),
5368 TYPE_SIZE (integer_type_node)))
5369 val = perform_integral_promotions (val);
5370 if (warn_missing_format_attribute)
5372 tree rhstype = TREE_TYPE (val);
5373 const enum tree_code coder = TREE_CODE (rhstype);
5374 const enum tree_code codel = TREE_CODE (type);
5375 if ((codel == POINTER_TYPE || codel == REFERENCE_TYPE)
5377 && check_missing_format_attribute (type, rhstype))
5378 warning (OPT_Wmissing_format_attribute,
5379 "argument of function call might be a candidate for a format attribute");
5384 /* Returns true iff FN is a function with magic varargs, i.e. ones for
5385 which no conversions at all should be done. This is true for some
5386 builtins which don't act like normal functions. */
5389 magic_varargs_p (tree fn)
5391 if (DECL_BUILT_IN (fn))
5392 switch (DECL_FUNCTION_CODE (fn))
5394 case BUILT_IN_CLASSIFY_TYPE:
5395 case BUILT_IN_CONSTANT_P:
5396 case BUILT_IN_NEXT_ARG:
5397 case BUILT_IN_VA_START:
5401 return lookup_attribute ("type generic",
5402 TYPE_ATTRIBUTES (TREE_TYPE (fn))) != 0;
5408 /* Subroutine of the various build_*_call functions. Overload resolution
5409 has chosen a winning candidate CAND; build up a CALL_EXPR accordingly.
5410 ARGS is a TREE_LIST of the unconverted arguments to the call. FLAGS is a
5411 bitmask of various LOOKUP_* flags which apply to the call itself. */
5414 build_over_call (struct z_candidate *cand, int flags, tsubst_flags_t complain)
5417 const VEC(tree,gc) *args = cand->args;
5418 tree first_arg = cand->first_arg;
5419 conversion **convs = cand->convs;
5421 tree parm = TYPE_ARG_TYPES (TREE_TYPE (fn));
5426 unsigned int arg_index = 0;
5430 bool already_used = false;
5432 /* In a template, there is no need to perform all of the work that
5433 is normally done. We are only interested in the type of the call
5434 expression, i.e., the return type of the function. Any semantic
5435 errors will be deferred until the template is instantiated. */
5436 if (processing_template_decl)
5440 const tree *argarray;
5443 return_type = TREE_TYPE (TREE_TYPE (fn));
5444 nargs = VEC_length (tree, args);
5445 if (first_arg == NULL_TREE)
5446 argarray = VEC_address (tree, CONST_CAST (VEC(tree,gc) *, args));
5454 alcarray = XALLOCAVEC (tree, nargs);
5455 alcarray[0] = first_arg;
5456 for (ix = 0; VEC_iterate (tree, args, ix, arg); ++ix)
5457 alcarray[ix + 1] = arg;
5458 argarray = alcarray;
5460 expr = build_call_array_loc (input_location,
5461 return_type, build_addr_func (fn), nargs,
5463 if (TREE_THIS_VOLATILE (fn) && cfun)
5464 current_function_returns_abnormally = 1;
5465 if (!VOID_TYPE_P (return_type))
5466 require_complete_type (return_type);
5467 return convert_from_reference (expr);
5470 /* Give any warnings we noticed during overload resolution. */
5473 struct candidate_warning *w;
5474 for (w = cand->warnings; w; w = w->next)
5475 joust (cand, w->loser, 1);
5478 /* Make =delete work with SFINAE. */
5479 if (DECL_DELETED_FN (fn) && !(complain & tf_error))
5480 return error_mark_node;
5482 if (DECL_FUNCTION_MEMBER_P (fn))
5484 /* If FN is a template function, two cases must be considered.
5489 template <class T> void f();
5491 template <class T> struct B {
5495 struct C : A, B<int> {
5497 using B<int>::g; // #2
5500 In case #1 where `A::f' is a member template, DECL_ACCESS is
5501 recorded in the primary template but not in its specialization.
5502 We check access of FN using its primary template.
5504 In case #2, where `B<int>::g' has a DECL_TEMPLATE_INFO simply
5505 because it is a member of class template B, DECL_ACCESS is
5506 recorded in the specialization `B<int>::g'. We cannot use its
5507 primary template because `B<T>::g' and `B<int>::g' may have
5508 different access. */
5509 if (DECL_TEMPLATE_INFO (fn)
5510 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (fn)))
5511 perform_or_defer_access_check (cand->access_path,
5512 DECL_TI_TEMPLATE (fn), fn);
5514 perform_or_defer_access_check (cand->access_path, fn, fn);
5517 /* Find maximum size of vector to hold converted arguments. */
5518 parmlen = list_length (parm);
5519 nargs = VEC_length (tree, args) + (first_arg != NULL_TREE ? 1 : 0);
5520 if (parmlen > nargs)
5522 argarray = (tree *) alloca (nargs * sizeof (tree));
5524 /* The implicit parameters to a constructor are not considered by overload
5525 resolution, and must be of the proper type. */
5526 if (DECL_CONSTRUCTOR_P (fn))
5528 if (first_arg != NULL_TREE)
5530 argarray[j++] = first_arg;
5531 first_arg = NULL_TREE;
5535 argarray[j++] = VEC_index (tree, args, arg_index);
5538 parm = TREE_CHAIN (parm);
5539 /* We should never try to call the abstract constructor. */
5540 gcc_assert (!DECL_HAS_IN_CHARGE_PARM_P (fn));
5542 if (DECL_HAS_VTT_PARM_P (fn))
5544 argarray[j++] = VEC_index (tree, args, arg_index);
5546 parm = TREE_CHAIN (parm);
5549 /* Bypass access control for 'this' parameter. */
5550 else if (TREE_CODE (TREE_TYPE (fn)) == METHOD_TYPE)
5552 tree parmtype = TREE_VALUE (parm);
5553 tree arg = (first_arg != NULL_TREE
5555 : VEC_index (tree, args, arg_index));
5556 tree argtype = TREE_TYPE (arg);
5560 if (convs[i]->bad_p)
5562 if (complain & tf_error)
5563 permerror (input_location, "passing %qT as %<this%> argument of %q#D discards qualifiers",
5564 TREE_TYPE (argtype), fn);
5566 return error_mark_node;
5569 /* [class.mfct.nonstatic]: If a nonstatic member function of a class
5570 X is called for an object that is not of type X, or of a type
5571 derived from X, the behavior is undefined.
5573 So we can assume that anything passed as 'this' is non-null, and
5574 optimize accordingly. */
5575 gcc_assert (TREE_CODE (parmtype) == POINTER_TYPE);
5576 /* Convert to the base in which the function was declared. */
5577 gcc_assert (cand->conversion_path != NULL_TREE);
5578 converted_arg = build_base_path (PLUS_EXPR,
5580 cand->conversion_path,
5582 /* Check that the base class is accessible. */
5583 if (!accessible_base_p (TREE_TYPE (argtype),
5584 BINFO_TYPE (cand->conversion_path), true))
5585 error ("%qT is not an accessible base of %qT",
5586 BINFO_TYPE (cand->conversion_path),
5587 TREE_TYPE (argtype));
5588 /* If fn was found by a using declaration, the conversion path
5589 will be to the derived class, not the base declaring fn. We
5590 must convert from derived to base. */
5591 base_binfo = lookup_base (TREE_TYPE (TREE_TYPE (converted_arg)),
5592 TREE_TYPE (parmtype), ba_unique, NULL);
5593 converted_arg = build_base_path (PLUS_EXPR, converted_arg,
5596 argarray[j++] = converted_arg;
5597 parm = TREE_CHAIN (parm);
5598 if (first_arg != NULL_TREE)
5599 first_arg = NULL_TREE;
5606 gcc_assert (first_arg == NULL_TREE);
5607 for (; arg_index < VEC_length (tree, args) && parm;
5608 parm = TREE_CHAIN (parm), ++arg_index, ++i)
5610 tree type = TREE_VALUE (parm);
5614 /* Don't make a copy here if build_call is going to. */
5615 if (conv->kind == ck_rvalue
5616 && COMPLETE_TYPE_P (complete_type (type))
5617 && !TREE_ADDRESSABLE (type))
5618 conv = conv->u.next;
5620 /* Warn about initializer_list deduction that isn't currently in the
5622 if (cxx_dialect > cxx98
5623 && flag_deduce_init_list
5624 && cand->template_decl
5625 && is_std_init_list (non_reference (type)))
5627 tree tmpl = TI_TEMPLATE (cand->template_decl);
5628 tree realparm = chain_index (j, DECL_ARGUMENTS (cand->fn));
5629 tree patparm = get_pattern_parm (realparm, tmpl);
5631 if (!is_std_init_list (non_reference (TREE_TYPE (patparm))))
5633 pedwarn (input_location, 0, "deducing %qT as %qT",
5634 non_reference (TREE_TYPE (patparm)),
5635 non_reference (type));
5636 pedwarn (input_location, 0, " in call to %q+D", cand->fn);
5637 pedwarn (input_location, 0,
5638 " (you can disable this with -fno-deduce-init-list)");
5642 val = convert_like_with_context
5643 (conv, VEC_index (tree, args, arg_index), fn, i - is_method,
5646 val = convert_for_arg_passing (type, val);
5647 if (val == error_mark_node)
5648 return error_mark_node;
5650 argarray[j++] = val;
5653 /* Default arguments */
5654 for (; parm && parm != void_list_node; parm = TREE_CHAIN (parm), i++)
5655 argarray[j++] = convert_default_arg (TREE_VALUE (parm),
5656 TREE_PURPOSE (parm),
5659 for (; arg_index < VEC_length (tree, args); ++arg_index)
5661 tree a = VEC_index (tree, args, arg_index);
5662 if (magic_varargs_p (fn))
5663 /* Do no conversions for magic varargs. */;
5665 a = convert_arg_to_ellipsis (a);
5669 gcc_assert (j <= nargs);
5672 check_function_arguments (TYPE_ATTRIBUTES (TREE_TYPE (fn)),
5673 nargs, argarray, TYPE_ARG_TYPES (TREE_TYPE (fn)));
5675 /* Avoid actually calling copy constructors and copy assignment operators,
5678 if (! flag_elide_constructors)
5679 /* Do things the hard way. */;
5680 else if (cand->num_convs == 1
5681 && (DECL_COPY_CONSTRUCTOR_P (fn)
5682 || DECL_MOVE_CONSTRUCTOR_P (fn)))
5685 tree arg = argarray[num_artificial_parms_for (fn)];
5688 /* Pull out the real argument, disregarding const-correctness. */
5690 while (CONVERT_EXPR_P (targ)
5691 || TREE_CODE (targ) == NON_LVALUE_EXPR)
5692 targ = TREE_OPERAND (targ, 0);
5693 if (TREE_CODE (targ) == ADDR_EXPR)
5695 targ = TREE_OPERAND (targ, 0);
5696 if (!same_type_ignoring_top_level_qualifiers_p
5697 (TREE_TYPE (TREE_TYPE (arg)), TREE_TYPE (targ)))
5706 arg = cp_build_indirect_ref (arg, 0, complain);
5708 if (TREE_CODE (arg) == TARGET_EXPR
5709 && TARGET_EXPR_LIST_INIT_P (arg))
5711 /* Copy-list-initialization doesn't require the copy constructor
5714 /* [class.copy]: the copy constructor is implicitly defined even if
5715 the implementation elided its use. */
5716 else if (TYPE_HAS_COMPLEX_INIT_REF (DECL_CONTEXT (fn)))
5719 already_used = true;
5722 /* If we're creating a temp and we already have one, don't create a
5723 new one. If we're not creating a temp but we get one, use
5724 INIT_EXPR to collapse the temp into our target. Otherwise, if the
5725 ctor is trivial, do a bitwise copy with a simple TARGET_EXPR for a
5726 temp or an INIT_EXPR otherwise. */
5727 fa = (cand->first_arg != NULL_TREE
5729 : VEC_index (tree, args, 0));
5730 if (integer_zerop (fa))
5732 if (TREE_CODE (arg) == TARGET_EXPR)
5734 else if (TYPE_HAS_TRIVIAL_INIT_REF (DECL_CONTEXT (fn)))
5735 return build_target_expr_with_type (arg, DECL_CONTEXT (fn));
5737 else if (TREE_CODE (arg) == TARGET_EXPR
5738 || (TYPE_HAS_TRIVIAL_INIT_REF (DECL_CONTEXT (fn))
5739 && !move_fn_p (fn)))
5741 tree to = stabilize_reference (cp_build_indirect_ref (fa, 0,
5744 val = build2 (INIT_EXPR, DECL_CONTEXT (fn), to, arg);
5748 else if (DECL_OVERLOADED_OPERATOR_P (fn) == NOP_EXPR
5750 && TYPE_HAS_TRIVIAL_ASSIGN_REF (DECL_CONTEXT (fn)))
5752 tree to = stabilize_reference
5753 (cp_build_indirect_ref (argarray[0], 0, complain));
5754 tree type = TREE_TYPE (to);
5755 tree as_base = CLASSTYPE_AS_BASE (type);
5756 tree arg = argarray[1];
5758 if (tree_int_cst_equal (TYPE_SIZE (type), TYPE_SIZE (as_base)))
5760 arg = cp_build_indirect_ref (arg, 0, complain);
5761 val = build2 (MODIFY_EXPR, TREE_TYPE (to), to, arg);
5765 /* We must only copy the non-tail padding parts.
5766 Use __builtin_memcpy for the bitwise copy.
5767 FIXME fix 22488 so we can go back to using MODIFY_EXPR
5768 instead of an explicit call to memcpy. */
5770 tree arg0, arg1, arg2, t;
5771 tree test = NULL_TREE;
5773 arg2 = TYPE_SIZE_UNIT (as_base);
5775 arg0 = cp_build_unary_op (ADDR_EXPR, to, 0, complain);
5777 if (!can_trust_pointer_alignment ())
5779 /* If we can't be sure about pointer alignment, a call
5780 to __builtin_memcpy is expanded as a call to memcpy, which
5781 is invalid with identical args. Otherwise it is
5782 expanded as a block move, which should be safe. */
5783 arg0 = save_expr (arg0);
5784 arg1 = save_expr (arg1);
5785 test = build2 (EQ_EXPR, boolean_type_node, arg0, arg1);
5787 t = implicit_built_in_decls[BUILT_IN_MEMCPY];
5788 t = build_call_n (t, 3, arg0, arg1, arg2);
5790 t = convert (TREE_TYPE (arg0), t);
5792 t = build3 (COND_EXPR, TREE_TYPE (t), test, arg0, t);
5793 val = cp_build_indirect_ref (t, 0, complain);
5794 TREE_NO_WARNING (val) = 1;
5803 if (DECL_VINDEX (fn) && (flags & LOOKUP_NONVIRTUAL) == 0)
5806 tree binfo = lookup_base (TREE_TYPE (TREE_TYPE (argarray[0])),
5809 gcc_assert (binfo && binfo != error_mark_node);
5811 /* Warn about deprecated virtual functions now, since we're about
5812 to throw away the decl. */
5813 if (TREE_DEPRECATED (fn))
5814 warn_deprecated_use (fn, NULL_TREE);
5816 argarray[0] = build_base_path (PLUS_EXPR, argarray[0], binfo, 1);
5817 if (TREE_SIDE_EFFECTS (argarray[0]))
5818 argarray[0] = save_expr (argarray[0]);
5819 t = build_pointer_type (TREE_TYPE (fn));
5820 if (DECL_CONTEXT (fn) && TYPE_JAVA_INTERFACE (DECL_CONTEXT (fn)))
5821 fn = build_java_interface_fn_ref (fn, argarray[0]);
5823 fn = build_vfn_ref (argarray[0], DECL_VINDEX (fn));
5827 fn = build_addr_func (fn);
5829 return build_cxx_call (fn, nargs, argarray);
5832 /* Build and return a call to FN, using NARGS arguments in ARGARRAY.
5833 This function performs no overload resolution, conversion, or other
5834 high-level operations. */
5837 build_cxx_call (tree fn, int nargs, tree *argarray)
5841 fn = build_call_a (fn, nargs, argarray);
5843 /* If this call might throw an exception, note that fact. */
5844 fndecl = get_callee_fndecl (fn);
5845 if ((!fndecl || !TREE_NOTHROW (fndecl))
5846 && at_function_scope_p ()
5848 cp_function_chain->can_throw = 1;
5850 /* Check that arguments to builtin functions match the expectations. */
5852 && DECL_BUILT_IN (fndecl)
5853 && DECL_BUILT_IN_CLASS (fndecl) == BUILT_IN_NORMAL
5854 && !check_builtin_function_arguments (fndecl, nargs, argarray))
5855 return error_mark_node;
5857 /* Some built-in function calls will be evaluated at compile-time in
5859 fn = fold_if_not_in_template (fn);
5861 if (VOID_TYPE_P (TREE_TYPE (fn)))
5864 fn = require_complete_type (fn);
5865 if (fn == error_mark_node)
5866 return error_mark_node;
5868 if (MAYBE_CLASS_TYPE_P (TREE_TYPE (fn)))
5869 fn = build_cplus_new (TREE_TYPE (fn), fn);
5870 return convert_from_reference (fn);
5873 static GTY(()) tree java_iface_lookup_fn;
5875 /* Make an expression which yields the address of the Java interface
5876 method FN. This is achieved by generating a call to libjava's
5877 _Jv_LookupInterfaceMethodIdx(). */
5880 build_java_interface_fn_ref (tree fn, tree instance)
5882 tree lookup_fn, method, idx;
5883 tree klass_ref, iface, iface_ref;
5886 if (!java_iface_lookup_fn)
5888 tree endlink = build_void_list_node ();
5889 tree t = tree_cons (NULL_TREE, ptr_type_node,
5890 tree_cons (NULL_TREE, ptr_type_node,
5891 tree_cons (NULL_TREE, java_int_type_node,
5893 java_iface_lookup_fn
5894 = add_builtin_function ("_Jv_LookupInterfaceMethodIdx",
5895 build_function_type (ptr_type_node, t),
5896 0, NOT_BUILT_IN, NULL, NULL_TREE);
5899 /* Look up the pointer to the runtime java.lang.Class object for `instance'.
5900 This is the first entry in the vtable. */
5901 klass_ref = build_vtbl_ref (cp_build_indirect_ref (instance, 0,
5902 tf_warning_or_error),
5905 /* Get the java.lang.Class pointer for the interface being called. */
5906 iface = DECL_CONTEXT (fn);
5907 iface_ref = lookup_field (iface, get_identifier ("class$"), 0, false);
5908 if (!iface_ref || TREE_CODE (iface_ref) != VAR_DECL
5909 || DECL_CONTEXT (iface_ref) != iface)
5911 error ("could not find class$ field in java interface type %qT",
5913 return error_mark_node;
5915 iface_ref = build_address (iface_ref);
5916 iface_ref = convert (build_pointer_type (iface), iface_ref);
5918 /* Determine the itable index of FN. */
5920 for (method = TYPE_METHODS (iface); method; method = TREE_CHAIN (method))
5922 if (!DECL_VIRTUAL_P (method))
5928 idx = build_int_cst (NULL_TREE, i);
5930 lookup_fn = build1 (ADDR_EXPR,
5931 build_pointer_type (TREE_TYPE (java_iface_lookup_fn)),
5932 java_iface_lookup_fn);
5933 return build_call_nary (ptr_type_node, lookup_fn,
5934 3, klass_ref, iface_ref, idx);
5937 /* Returns the value to use for the in-charge parameter when making a
5938 call to a function with the indicated NAME.
5940 FIXME:Can't we find a neater way to do this mapping? */
5943 in_charge_arg_for_name (tree name)
5945 if (name == base_ctor_identifier
5946 || name == base_dtor_identifier)
5947 return integer_zero_node;
5948 else if (name == complete_ctor_identifier)
5949 return integer_one_node;
5950 else if (name == complete_dtor_identifier)
5951 return integer_two_node;
5952 else if (name == deleting_dtor_identifier)
5953 return integer_three_node;
5955 /* This function should only be called with one of the names listed
5961 /* Build a call to a constructor, destructor, or an assignment
5962 operator for INSTANCE, an expression with class type. NAME
5963 indicates the special member function to call; *ARGS are the
5964 arguments. ARGS may be NULL. This may change ARGS. BINFO
5965 indicates the base of INSTANCE that is to be passed as the `this'
5966 parameter to the member function called.
5968 FLAGS are the LOOKUP_* flags to use when processing the call.
5970 If NAME indicates a complete object constructor, INSTANCE may be
5971 NULL_TREE. In this case, the caller will call build_cplus_new to
5972 store the newly constructed object into a VAR_DECL. */
5975 build_special_member_call (tree instance, tree name, VEC(tree,gc) **args,
5976 tree binfo, int flags, tsubst_flags_t complain)
5979 /* The type of the subobject to be constructed or destroyed. */
5981 VEC(tree,gc) *allocated = NULL;
5984 gcc_assert (name == complete_ctor_identifier
5985 || name == base_ctor_identifier
5986 || name == complete_dtor_identifier
5987 || name == base_dtor_identifier
5988 || name == deleting_dtor_identifier
5989 || name == ansi_assopname (NOP_EXPR));
5992 /* Resolve the name. */
5993 if (!complete_type_or_else (binfo, NULL_TREE))
5994 return error_mark_node;
5996 binfo = TYPE_BINFO (binfo);
5999 gcc_assert (binfo != NULL_TREE);
6001 class_type = BINFO_TYPE (binfo);
6003 /* Handle the special case where INSTANCE is NULL_TREE. */
6004 if (name == complete_ctor_identifier && !instance)
6006 instance = build_int_cst (build_pointer_type (class_type), 0);
6007 instance = build1 (INDIRECT_REF, class_type, instance);
6011 if (name == complete_dtor_identifier
6012 || name == base_dtor_identifier
6013 || name == deleting_dtor_identifier)
6014 gcc_assert (args == NULL || VEC_empty (tree, *args));
6016 /* Convert to the base class, if necessary. */
6017 if (!same_type_ignoring_top_level_qualifiers_p
6018 (TREE_TYPE (instance), BINFO_TYPE (binfo)))
6020 if (name != ansi_assopname (NOP_EXPR))
6021 /* For constructors and destructors, either the base is
6022 non-virtual, or it is virtual but we are doing the
6023 conversion from a constructor or destructor for the
6024 complete object. In either case, we can convert
6026 instance = convert_to_base_statically (instance, binfo);
6028 /* However, for assignment operators, we must convert
6029 dynamically if the base is virtual. */
6030 instance = build_base_path (PLUS_EXPR, instance,
6031 binfo, /*nonnull=*/1);
6035 gcc_assert (instance != NULL_TREE);
6037 fns = lookup_fnfields (binfo, name, 1);
6039 /* When making a call to a constructor or destructor for a subobject
6040 that uses virtual base classes, pass down a pointer to a VTT for
6042 if ((name == base_ctor_identifier
6043 || name == base_dtor_identifier)
6044 && CLASSTYPE_VBASECLASSES (class_type))
6049 /* If the current function is a complete object constructor
6050 or destructor, then we fetch the VTT directly.
6051 Otherwise, we look it up using the VTT we were given. */
6052 vtt = TREE_CHAIN (CLASSTYPE_VTABLES (current_class_type));
6053 vtt = decay_conversion (vtt);
6054 vtt = build3 (COND_EXPR, TREE_TYPE (vtt),
6055 build2 (EQ_EXPR, boolean_type_node,
6056 current_in_charge_parm, integer_zero_node),
6059 gcc_assert (BINFO_SUBVTT_INDEX (binfo));
6060 sub_vtt = build2 (POINTER_PLUS_EXPR, TREE_TYPE (vtt), vtt,
6061 BINFO_SUBVTT_INDEX (binfo));
6065 allocated = make_tree_vector ();
6069 VEC_safe_insert (tree, gc, *args, 0, sub_vtt);
6072 ret = build_new_method_call (instance, fns, args,
6073 TYPE_BINFO (BINFO_TYPE (binfo)),
6077 if (allocated != NULL)
6078 release_tree_vector (allocated);
6083 /* Return the NAME, as a C string. The NAME indicates a function that
6084 is a member of TYPE. *FREE_P is set to true if the caller must
6085 free the memory returned.
6087 Rather than go through all of this, we should simply set the names
6088 of constructors and destructors appropriately, and dispense with
6089 ctor_identifier, dtor_identifier, etc. */
6092 name_as_c_string (tree name, tree type, bool *free_p)
6096 /* Assume that we will not allocate memory. */
6098 /* Constructors and destructors are special. */
6099 if (IDENTIFIER_CTOR_OR_DTOR_P (name))
6102 = CONST_CAST (char *, identifier_to_locale (IDENTIFIER_POINTER (constructor_name (type))));
6103 /* For a destructor, add the '~'. */
6104 if (name == complete_dtor_identifier
6105 || name == base_dtor_identifier
6106 || name == deleting_dtor_identifier)
6108 pretty_name = concat ("~", pretty_name, NULL);
6109 /* Remember that we need to free the memory allocated. */
6113 else if (IDENTIFIER_TYPENAME_P (name))
6115 pretty_name = concat ("operator ",
6116 type_as_string_translate (TREE_TYPE (name),
6117 TFF_PLAIN_IDENTIFIER),
6119 /* Remember that we need to free the memory allocated. */
6123 pretty_name = CONST_CAST (char *, identifier_to_locale (IDENTIFIER_POINTER (name)));
6128 /* Build a call to "INSTANCE.FN (ARGS)". If FN_P is non-NULL, it will
6129 be set, upon return, to the function called. ARGS may be NULL.
6130 This may change ARGS. */
6133 build_new_method_call (tree instance, tree fns, VEC(tree,gc) **args,
6134 tree conversion_path, int flags,
6135 tree *fn_p, tsubst_flags_t complain)
6137 struct z_candidate *candidates = 0, *cand;
6138 tree explicit_targs = NULL_TREE;
6139 tree basetype = NULL_TREE;
6142 tree first_mem_arg = NULL_TREE;
6145 bool skip_first_for_error;
6146 VEC(tree,gc) *user_args;
6150 int template_only = 0;
6154 VEC(tree,gc) *orig_args = NULL;
6157 gcc_assert (instance != NULL_TREE);
6159 /* We don't know what function we're going to call, yet. */
6163 if (error_operand_p (instance)
6164 || error_operand_p (fns))
6165 return error_mark_node;
6167 if (!BASELINK_P (fns))
6169 if (complain & tf_error)
6170 error ("call to non-function %qD", fns);
6171 return error_mark_node;
6174 orig_instance = instance;
6177 /* Dismantle the baselink to collect all the information we need. */
6178 if (!conversion_path)
6179 conversion_path = BASELINK_BINFO (fns);
6180 access_binfo = BASELINK_ACCESS_BINFO (fns);
6181 optype = BASELINK_OPTYPE (fns);
6182 fns = BASELINK_FUNCTIONS (fns);
6183 if (TREE_CODE (fns) == TEMPLATE_ID_EXPR)
6185 explicit_targs = TREE_OPERAND (fns, 1);
6186 fns = TREE_OPERAND (fns, 0);
6189 gcc_assert (TREE_CODE (fns) == FUNCTION_DECL
6190 || TREE_CODE (fns) == TEMPLATE_DECL
6191 || TREE_CODE (fns) == OVERLOAD);
6192 fn = get_first_fn (fns);
6193 name = DECL_NAME (fn);
6195 basetype = TYPE_MAIN_VARIANT (TREE_TYPE (instance));
6196 gcc_assert (CLASS_TYPE_P (basetype));
6198 if (processing_template_decl)
6200 orig_args = args == NULL ? NULL : make_tree_vector_copy (*args);
6201 instance = build_non_dependent_expr (instance);
6203 make_args_non_dependent (*args);
6206 /* Figure out whether to skip the first argument for the error
6207 message we will display to users if an error occurs. We don't
6208 want to display any compiler-generated arguments. The "this"
6209 pointer hasn't been added yet. However, we must remove the VTT
6210 pointer if this is a call to a base-class constructor or
6212 skip_first_for_error = false;
6213 user_args = args == NULL ? NULL : *args;
6214 if (IDENTIFIER_CTOR_OR_DTOR_P (name))
6216 /* Callers should explicitly indicate whether they want to construct
6217 the complete object or just the part without virtual bases. */
6218 gcc_assert (name != ctor_identifier);
6219 /* Similarly for destructors. */
6220 gcc_assert (name != dtor_identifier);
6221 /* Remove the VTT pointer, if present. */
6222 if ((name == base_ctor_identifier || name == base_dtor_identifier)
6223 && CLASSTYPE_VBASECLASSES (basetype))
6224 skip_first_for_error = true;
6227 /* Process the argument list. */
6228 if (args != NULL && *args != NULL)
6230 *args = resolve_args (*args);
6232 return error_mark_node;
6235 instance_ptr = build_this (instance);
6237 /* It's OK to call destructors and constructors on cv-qualified objects.
6238 Therefore, convert the INSTANCE_PTR to the unqualified type, if
6240 if (DECL_DESTRUCTOR_P (fn)
6241 || DECL_CONSTRUCTOR_P (fn))
6243 tree type = build_pointer_type (basetype);
6244 if (!same_type_p (type, TREE_TYPE (instance_ptr)))
6245 instance_ptr = build_nop (type, instance_ptr);
6247 if (DECL_DESTRUCTOR_P (fn))
6248 name = complete_dtor_identifier;
6250 /* If CONSTRUCTOR_IS_DIRECT_INIT is set, this was a T{ } form
6251 initializer, not T({ }). If the type doesn't have a list ctor,
6252 break apart the list into separate ctor args. */
6253 if (DECL_CONSTRUCTOR_P (fn) && args != NULL && !VEC_empty (tree, *args)
6254 && BRACE_ENCLOSED_INITIALIZER_P (VEC_index (tree, *args, 0))
6255 && CONSTRUCTOR_IS_DIRECT_INIT (VEC_index (tree, *args, 0))
6256 && !TYPE_HAS_LIST_CTOR (basetype))
6258 gcc_assert (VEC_length (tree, *args) == 1);
6259 *args = ctor_to_vec (VEC_index (tree, *args, 0));
6262 class_type = (conversion_path ? BINFO_TYPE (conversion_path) : NULL_TREE);
6263 first_mem_arg = instance_ptr;
6265 /* Get the high-water mark for the CONVERSION_OBSTACK. */
6266 p = conversion_obstack_alloc (0);
6268 for (fn = fns; fn; fn = OVL_NEXT (fn))
6270 tree t = OVL_CURRENT (fn);
6271 tree this_first_arg;
6273 /* We can end up here for copy-init of same or base class. */
6274 if ((flags & LOOKUP_ONLYCONVERTING)
6275 && DECL_NONCONVERTING_P (t))
6278 if (DECL_NONSTATIC_MEMBER_FUNCTION_P (t))
6279 this_first_arg = first_mem_arg;
6281 this_first_arg = NULL_TREE;
6283 if (TREE_CODE (t) == TEMPLATE_DECL)
6284 /* A member template. */
6285 add_template_candidate (&candidates, t,
6289 args == NULL ? NULL : *args,
6295 else if (! template_only)
6296 add_function_candidate (&candidates, t,
6299 args == NULL ? NULL : *args,
6305 candidates = splice_viable (candidates, pedantic, &any_viable_p);
6308 if (complain & tf_error)
6310 if (!COMPLETE_TYPE_P (basetype))
6311 cxx_incomplete_type_error (instance_ptr, basetype);
6318 pretty_name = name_as_c_string (name, basetype, &free_p);
6319 arglist = build_tree_list_vec (user_args);
6320 if (skip_first_for_error)
6321 arglist = TREE_CHAIN (arglist);
6322 error ("no matching function for call to %<%T::%s(%A)%#V%>",
6323 basetype, pretty_name, arglist,
6324 TREE_TYPE (TREE_TYPE (instance_ptr)));
6328 print_z_candidates (candidates);
6330 call = error_mark_node;
6334 cand = tourney (candidates);
6341 if (complain & tf_error)
6343 pretty_name = name_as_c_string (name, basetype, &free_p);
6344 arglist = build_tree_list_vec (user_args);
6345 if (skip_first_for_error)
6346 arglist = TREE_CHAIN (arglist);
6347 error ("call of overloaded %<%s(%A)%> is ambiguous", pretty_name,
6349 print_z_candidates (candidates);
6353 call = error_mark_node;
6359 if (!(flags & LOOKUP_NONVIRTUAL)
6360 && DECL_PURE_VIRTUAL_P (fn)
6361 && instance == current_class_ref
6362 && (DECL_CONSTRUCTOR_P (current_function_decl)
6363 || DECL_DESTRUCTOR_P (current_function_decl))
6364 && (complain & tf_warning))
6365 /* This is not an error, it is runtime undefined
6367 warning (0, (DECL_CONSTRUCTOR_P (current_function_decl) ?
6368 "abstract virtual %q#D called from constructor"
6369 : "abstract virtual %q#D called from destructor"),
6372 if (TREE_CODE (TREE_TYPE (fn)) == METHOD_TYPE
6373 && is_dummy_object (instance_ptr))
6375 if (complain & tf_error)
6376 error ("cannot call member function %qD without object",
6378 call = error_mark_node;
6382 if (DECL_VINDEX (fn) && ! (flags & LOOKUP_NONVIRTUAL)
6383 && resolves_to_fixed_type_p (instance, 0))
6384 flags |= LOOKUP_NONVIRTUAL;
6385 /* Now we know what function is being called. */
6388 /* Build the actual CALL_EXPR. */
6389 call = build_over_call (cand, flags, complain);
6390 /* In an expression of the form `a->f()' where `f' turns
6391 out to be a static member function, `a' is
6392 none-the-less evaluated. */
6393 if (TREE_CODE (TREE_TYPE (fn)) != METHOD_TYPE
6394 && !is_dummy_object (instance_ptr)
6395 && TREE_SIDE_EFFECTS (instance_ptr))
6396 call = build2 (COMPOUND_EXPR, TREE_TYPE (call),
6397 instance_ptr, call);
6398 else if (call != error_mark_node
6399 && DECL_DESTRUCTOR_P (cand->fn)
6400 && !VOID_TYPE_P (TREE_TYPE (call)))
6401 /* An explicit call of the form "x->~X()" has type
6402 "void". However, on platforms where destructors
6403 return "this" (i.e., those where
6404 targetm.cxx.cdtor_returns_this is true), such calls
6405 will appear to have a return value of pointer type
6406 to the low-level call machinery. We do not want to
6407 change the low-level machinery, since we want to be
6408 able to optimize "delete f()" on such platforms as
6409 "operator delete(~X(f()))" (rather than generating
6410 "t = f(), ~X(t), operator delete (t)"). */
6411 call = build_nop (void_type_node, call);
6416 if (processing_template_decl && call != error_mark_node)
6418 bool cast_to_void = false;
6420 if (TREE_CODE (call) == COMPOUND_EXPR)
6421 call = TREE_OPERAND (call, 1);
6422 else if (TREE_CODE (call) == NOP_EXPR)
6424 cast_to_void = true;
6425 call = TREE_OPERAND (call, 0);
6427 if (TREE_CODE (call) == INDIRECT_REF)
6428 call = TREE_OPERAND (call, 0);
6429 call = (build_min_non_dep_call_vec
6431 build_min (COMPONENT_REF, TREE_TYPE (CALL_EXPR_FN (call)),
6432 orig_instance, orig_fns, NULL_TREE),
6434 call = convert_from_reference (call);
6436 call = build_nop (void_type_node, call);
6439 /* Free all the conversions we allocated. */
6440 obstack_free (&conversion_obstack, p);
6442 if (orig_args != NULL)
6443 release_tree_vector (orig_args);
6448 /* Returns true iff standard conversion sequence ICS1 is a proper
6449 subsequence of ICS2. */
6452 is_subseq (conversion *ics1, conversion *ics2)
6454 /* We can assume that a conversion of the same code
6455 between the same types indicates a subsequence since we only get
6456 here if the types we are converting from are the same. */
6458 while (ics1->kind == ck_rvalue
6459 || ics1->kind == ck_lvalue)
6460 ics1 = ics1->u.next;
6464 while (ics2->kind == ck_rvalue
6465 || ics2->kind == ck_lvalue)
6466 ics2 = ics2->u.next;
6468 if (ics2->kind == ck_user
6469 || ics2->kind == ck_ambig
6470 || ics2->kind == ck_identity)
6471 /* At this point, ICS1 cannot be a proper subsequence of
6472 ICS2. We can get a USER_CONV when we are comparing the
6473 second standard conversion sequence of two user conversion
6477 ics2 = ics2->u.next;
6479 if (ics2->kind == ics1->kind
6480 && same_type_p (ics2->type, ics1->type)
6481 && same_type_p (ics2->u.next->type,
6482 ics1->u.next->type))
6487 /* Returns nonzero iff DERIVED is derived from BASE. The inputs may
6488 be any _TYPE nodes. */
6491 is_properly_derived_from (tree derived, tree base)
6493 if (!CLASS_TYPE_P (derived) || !CLASS_TYPE_P (base))
6496 /* We only allow proper derivation here. The DERIVED_FROM_P macro
6497 considers every class derived from itself. */
6498 return (!same_type_ignoring_top_level_qualifiers_p (derived, base)
6499 && DERIVED_FROM_P (base, derived));
6502 /* We build the ICS for an implicit object parameter as a pointer
6503 conversion sequence. However, such a sequence should be compared
6504 as if it were a reference conversion sequence. If ICS is the
6505 implicit conversion sequence for an implicit object parameter,
6506 modify it accordingly. */
6509 maybe_handle_implicit_object (conversion **ics)
6513 /* [over.match.funcs]
6515 For non-static member functions, the type of the
6516 implicit object parameter is "reference to cv X"
6517 where X is the class of which the function is a
6518 member and cv is the cv-qualification on the member
6519 function declaration. */
6520 conversion *t = *ics;
6521 tree reference_type;
6523 /* The `this' parameter is a pointer to a class type. Make the
6524 implicit conversion talk about a reference to that same class
6526 reference_type = TREE_TYPE (t->type);
6527 reference_type = build_reference_type (reference_type);
6529 if (t->kind == ck_qual)
6531 if (t->kind == ck_ptr)
6533 t = build_identity_conv (TREE_TYPE (t->type), NULL_TREE);
6534 t = direct_reference_binding (reference_type, t);
6536 t->rvaluedness_matches_p = 0;
6541 /* If *ICS is a REF_BIND set *ICS to the remainder of the conversion,
6542 and return the initial reference binding conversion. Otherwise,
6543 leave *ICS unchanged and return NULL. */
6546 maybe_handle_ref_bind (conversion **ics)
6548 if ((*ics)->kind == ck_ref_bind)
6550 conversion *old_ics = *ics;
6551 *ics = old_ics->u.next;
6552 (*ics)->user_conv_p = old_ics->user_conv_p;
6559 /* Compare two implicit conversion sequences according to the rules set out in
6560 [over.ics.rank]. Return values:
6562 1: ics1 is better than ics2
6563 -1: ics2 is better than ics1
6564 0: ics1 and ics2 are indistinguishable */
6567 compare_ics (conversion *ics1, conversion *ics2)
6573 tree deref_from_type1 = NULL_TREE;
6574 tree deref_from_type2 = NULL_TREE;
6575 tree deref_to_type1 = NULL_TREE;
6576 tree deref_to_type2 = NULL_TREE;
6577 conversion_rank rank1, rank2;
6579 /* REF_BINDING is nonzero if the result of the conversion sequence
6580 is a reference type. In that case REF_CONV is the reference
6581 binding conversion. */
6582 conversion *ref_conv1;
6583 conversion *ref_conv2;
6585 /* Handle implicit object parameters. */
6586 maybe_handle_implicit_object (&ics1);
6587 maybe_handle_implicit_object (&ics2);
6589 /* Handle reference parameters. */
6590 ref_conv1 = maybe_handle_ref_bind (&ics1);
6591 ref_conv2 = maybe_handle_ref_bind (&ics2);
6593 /* List-initialization sequence L1 is a better conversion sequence than
6594 list-initialization sequence L2 if L1 converts to
6595 std::initializer_list<X> for some X and L2 does not. */
6596 if (ics1->kind == ck_list && ics2->kind != ck_list)
6598 if (ics2->kind == ck_list && ics1->kind != ck_list)
6603 When comparing the basic forms of implicit conversion sequences (as
6604 defined in _over.best.ics_)
6606 --a standard conversion sequence (_over.ics.scs_) is a better
6607 conversion sequence than a user-defined conversion sequence
6608 or an ellipsis conversion sequence, and
6610 --a user-defined conversion sequence (_over.ics.user_) is a
6611 better conversion sequence than an ellipsis conversion sequence
6612 (_over.ics.ellipsis_). */
6613 rank1 = CONVERSION_RANK (ics1);
6614 rank2 = CONVERSION_RANK (ics2);
6618 else if (rank1 < rank2)
6621 if (rank1 == cr_bad)
6623 /* XXX Isn't this an extension? */
6624 /* Both ICS are bad. We try to make a decision based on what
6625 would have happened if they'd been good. */
6626 if (ics1->user_conv_p > ics2->user_conv_p
6627 || ics1->rank > ics2->rank)
6629 else if (ics1->user_conv_p < ics2->user_conv_p
6630 || ics1->rank < ics2->rank)
6633 /* We couldn't make up our minds; try to figure it out below. */
6636 if (ics1->ellipsis_p || ics1->kind == ck_list)
6637 /* Both conversions are ellipsis conversions or both are building a
6638 std::initializer_list. */
6641 /* User-defined conversion sequence U1 is a better conversion sequence
6642 than another user-defined conversion sequence U2 if they contain the
6643 same user-defined conversion operator or constructor and if the sec-
6644 ond standard conversion sequence of U1 is better than the second
6645 standard conversion sequence of U2. */
6647 if (ics1->user_conv_p)
6652 for (t1 = ics1; t1->kind != ck_user; t1 = t1->u.next)
6653 if (t1->kind == ck_ambig || t1->kind == ck_aggr)
6655 for (t2 = ics2; t2->kind != ck_user; t2 = t2->u.next)
6656 if (t2->kind == ck_ambig || t2->kind == ck_aggr)
6659 if (t1->cand->fn != t2->cand->fn)
6662 /* We can just fall through here, after setting up
6663 FROM_TYPE1 and FROM_TYPE2. */
6664 from_type1 = t1->type;
6665 from_type2 = t2->type;
6672 /* We're dealing with two standard conversion sequences.
6676 Standard conversion sequence S1 is a better conversion
6677 sequence than standard conversion sequence S2 if
6679 --S1 is a proper subsequence of S2 (comparing the conversion
6680 sequences in the canonical form defined by _over.ics.scs_,
6681 excluding any Lvalue Transformation; the identity
6682 conversion sequence is considered to be a subsequence of
6683 any non-identity conversion sequence */
6686 while (t1->kind != ck_identity)
6688 from_type1 = t1->type;
6691 while (t2->kind != ck_identity)
6693 from_type2 = t2->type;
6696 /* One sequence can only be a subsequence of the other if they start with
6697 the same type. They can start with different types when comparing the
6698 second standard conversion sequence in two user-defined conversion
6700 if (same_type_p (from_type1, from_type2))
6702 if (is_subseq (ics1, ics2))
6704 if (is_subseq (ics2, ics1))
6712 --the rank of S1 is better than the rank of S2 (by the rules
6715 Standard conversion sequences are ordered by their ranks: an Exact
6716 Match is a better conversion than a Promotion, which is a better
6717 conversion than a Conversion.
6719 Two conversion sequences with the same rank are indistinguishable
6720 unless one of the following rules applies:
6722 --A conversion that is not a conversion of a pointer, or pointer
6723 to member, to bool is better than another conversion that is such
6726 The ICS_STD_RANK automatically handles the pointer-to-bool rule,
6727 so that we do not have to check it explicitly. */
6728 if (ics1->rank < ics2->rank)
6730 else if (ics2->rank < ics1->rank)
6733 to_type1 = ics1->type;
6734 to_type2 = ics2->type;
6736 /* A conversion from scalar arithmetic type to complex is worse than a
6737 conversion between scalar arithmetic types. */
6738 if (same_type_p (from_type1, from_type2)
6739 && ARITHMETIC_TYPE_P (from_type1)
6740 && ARITHMETIC_TYPE_P (to_type1)
6741 && ARITHMETIC_TYPE_P (to_type2)
6742 && ((TREE_CODE (to_type1) == COMPLEX_TYPE)
6743 != (TREE_CODE (to_type2) == COMPLEX_TYPE)))
6745 if (TREE_CODE (to_type1) == COMPLEX_TYPE)
6751 if (TYPE_PTR_P (from_type1)
6752 && TYPE_PTR_P (from_type2)
6753 && TYPE_PTR_P (to_type1)
6754 && TYPE_PTR_P (to_type2))
6756 deref_from_type1 = TREE_TYPE (from_type1);
6757 deref_from_type2 = TREE_TYPE (from_type2);
6758 deref_to_type1 = TREE_TYPE (to_type1);
6759 deref_to_type2 = TREE_TYPE (to_type2);
6761 /* The rules for pointers to members A::* are just like the rules
6762 for pointers A*, except opposite: if B is derived from A then
6763 A::* converts to B::*, not vice versa. For that reason, we
6764 switch the from_ and to_ variables here. */
6765 else if ((TYPE_PTRMEM_P (from_type1) && TYPE_PTRMEM_P (from_type2)
6766 && TYPE_PTRMEM_P (to_type1) && TYPE_PTRMEM_P (to_type2))
6767 || (TYPE_PTRMEMFUNC_P (from_type1)
6768 && TYPE_PTRMEMFUNC_P (from_type2)
6769 && TYPE_PTRMEMFUNC_P (to_type1)
6770 && TYPE_PTRMEMFUNC_P (to_type2)))
6772 deref_to_type1 = TYPE_PTRMEM_CLASS_TYPE (from_type1);
6773 deref_to_type2 = TYPE_PTRMEM_CLASS_TYPE (from_type2);
6774 deref_from_type1 = TYPE_PTRMEM_CLASS_TYPE (to_type1);
6775 deref_from_type2 = TYPE_PTRMEM_CLASS_TYPE (to_type2);
6778 if (deref_from_type1 != NULL_TREE
6779 && RECORD_OR_UNION_CODE_P (TREE_CODE (deref_from_type1))
6780 && RECORD_OR_UNION_CODE_P (TREE_CODE (deref_from_type2)))
6782 /* This was one of the pointer or pointer-like conversions.
6786 --If class B is derived directly or indirectly from class A,
6787 conversion of B* to A* is better than conversion of B* to
6788 void*, and conversion of A* to void* is better than
6789 conversion of B* to void*. */
6790 if (TREE_CODE (deref_to_type1) == VOID_TYPE
6791 && TREE_CODE (deref_to_type2) == VOID_TYPE)
6793 if (is_properly_derived_from (deref_from_type1,
6796 else if (is_properly_derived_from (deref_from_type2,
6800 else if (TREE_CODE (deref_to_type1) == VOID_TYPE
6801 || TREE_CODE (deref_to_type2) == VOID_TYPE)
6803 if (same_type_p (deref_from_type1, deref_from_type2))
6805 if (TREE_CODE (deref_to_type2) == VOID_TYPE)
6807 if (is_properly_derived_from (deref_from_type1,
6811 /* We know that DEREF_TO_TYPE1 is `void' here. */
6812 else if (is_properly_derived_from (deref_from_type1,
6817 else if (RECORD_OR_UNION_CODE_P (TREE_CODE (deref_to_type1))
6818 && RECORD_OR_UNION_CODE_P (TREE_CODE (deref_to_type2)))
6822 --If class B is derived directly or indirectly from class A
6823 and class C is derived directly or indirectly from B,
6825 --conversion of C* to B* is better than conversion of C* to
6828 --conversion of B* to A* is better than conversion of C* to
6830 if (same_type_p (deref_from_type1, deref_from_type2))
6832 if (is_properly_derived_from (deref_to_type1,
6835 else if (is_properly_derived_from (deref_to_type2,
6839 else if (same_type_p (deref_to_type1, deref_to_type2))
6841 if (is_properly_derived_from (deref_from_type2,
6844 else if (is_properly_derived_from (deref_from_type1,
6850 else if (CLASS_TYPE_P (non_reference (from_type1))
6851 && same_type_p (from_type1, from_type2))
6853 tree from = non_reference (from_type1);
6857 --binding of an expression of type C to a reference of type
6858 B& is better than binding an expression of type C to a
6859 reference of type A&
6861 --conversion of C to B is better than conversion of C to A, */
6862 if (is_properly_derived_from (from, to_type1)
6863 && is_properly_derived_from (from, to_type2))
6865 if (is_properly_derived_from (to_type1, to_type2))
6867 else if (is_properly_derived_from (to_type2, to_type1))
6871 else if (CLASS_TYPE_P (non_reference (to_type1))
6872 && same_type_p (to_type1, to_type2))
6874 tree to = non_reference (to_type1);
6878 --binding of an expression of type B to a reference of type
6879 A& is better than binding an expression of type C to a
6880 reference of type A&,
6882 --conversion of B to A is better than conversion of C to A */
6883 if (is_properly_derived_from (from_type1, to)
6884 && is_properly_derived_from (from_type2, to))
6886 if (is_properly_derived_from (from_type2, from_type1))
6888 else if (is_properly_derived_from (from_type1, from_type2))
6895 --S1 and S2 differ only in their qualification conversion and yield
6896 similar types T1 and T2 (_conv.qual_), respectively, and the cv-
6897 qualification signature of type T1 is a proper subset of the cv-
6898 qualification signature of type T2 */
6899 if (ics1->kind == ck_qual
6900 && ics2->kind == ck_qual
6901 && same_type_p (from_type1, from_type2))
6903 int result = comp_cv_qual_signature (to_type1, to_type2);
6910 --S1 and S2 are reference bindings (_dcl.init.ref_) and neither refers
6911 to an implicit object parameter, and either S1 binds an lvalue reference
6912 to an lvalue and S2 binds an rvalue reference or S1 binds an rvalue
6913 reference to an rvalue and S2 binds an lvalue reference
6914 (C++0x draft standard, 13.3.3.2)
6916 --S1 and S2 are reference bindings (_dcl.init.ref_), and the
6917 types to which the references refer are the same type except for
6918 top-level cv-qualifiers, and the type to which the reference
6919 initialized by S2 refers is more cv-qualified than the type to
6920 which the reference initialized by S1 refers */
6922 if (ref_conv1 && ref_conv2)
6924 if (!ref_conv1->this_p && !ref_conv2->this_p
6925 && (TYPE_REF_IS_RVALUE (ref_conv1->type)
6926 != TYPE_REF_IS_RVALUE (ref_conv2->type)))
6928 if (ref_conv1->rvaluedness_matches_p)
6930 if (ref_conv2->rvaluedness_matches_p)
6934 if (same_type_ignoring_top_level_qualifiers_p (to_type1, to_type2))
6935 return comp_cv_qualification (TREE_TYPE (ref_conv2->type),
6936 TREE_TYPE (ref_conv1->type));
6939 /* Neither conversion sequence is better than the other. */
6943 /* The source type for this standard conversion sequence. */
6946 source_type (conversion *t)
6948 for (;; t = t->u.next)
6950 if (t->kind == ck_user
6951 || t->kind == ck_ambig
6952 || t->kind == ck_identity)
6958 /* Note a warning about preferring WINNER to LOSER. We do this by storing
6959 a pointer to LOSER and re-running joust to produce the warning if WINNER
6960 is actually used. */
6963 add_warning (struct z_candidate *winner, struct z_candidate *loser)
6965 candidate_warning *cw = (candidate_warning *)
6966 conversion_obstack_alloc (sizeof (candidate_warning));
6968 cw->next = winner->warnings;
6969 winner->warnings = cw;
6972 /* Compare two candidates for overloading as described in
6973 [over.match.best]. Return values:
6975 1: cand1 is better than cand2
6976 -1: cand2 is better than cand1
6977 0: cand1 and cand2 are indistinguishable */
6980 joust (struct z_candidate *cand1, struct z_candidate *cand2, bool warn)
6983 int off1 = 0, off2 = 0;
6987 /* Candidates that involve bad conversions are always worse than those
6989 if (cand1->viable > cand2->viable)
6991 if (cand1->viable < cand2->viable)
6994 /* If we have two pseudo-candidates for conversions to the same type,
6995 or two candidates for the same function, arbitrarily pick one. */
6996 if (cand1->fn == cand2->fn
6997 && (IS_TYPE_OR_DECL_P (cand1->fn)))
7000 /* a viable function F1
7001 is defined to be a better function than another viable function F2 if
7002 for all arguments i, ICSi(F1) is not a worse conversion sequence than
7003 ICSi(F2), and then */
7005 /* for some argument j, ICSj(F1) is a better conversion sequence than
7008 /* For comparing static and non-static member functions, we ignore
7009 the implicit object parameter of the non-static function. The
7010 standard says to pretend that the static function has an object
7011 parm, but that won't work with operator overloading. */
7012 len = cand1->num_convs;
7013 if (len != cand2->num_convs)
7015 int static_1 = DECL_STATIC_FUNCTION_P (cand1->fn);
7016 int static_2 = DECL_STATIC_FUNCTION_P (cand2->fn);
7018 gcc_assert (static_1 != static_2);
7029 for (i = 0; i < len; ++i)
7031 conversion *t1 = cand1->convs[i + off1];
7032 conversion *t2 = cand2->convs[i + off2];
7033 int comp = compare_ics (t1, t2);
7038 && (CONVERSION_RANK (t1) + CONVERSION_RANK (t2)
7039 == cr_std + cr_promotion)
7040 && t1->kind == ck_std
7041 && t2->kind == ck_std
7042 && TREE_CODE (t1->type) == INTEGER_TYPE
7043 && TREE_CODE (t2->type) == INTEGER_TYPE
7044 && (TYPE_PRECISION (t1->type)
7045 == TYPE_PRECISION (t2->type))
7046 && (TYPE_UNSIGNED (t1->u.next->type)
7047 || (TREE_CODE (t1->u.next->type)
7050 tree type = t1->u.next->type;
7052 struct z_candidate *w, *l;
7054 type1 = t1->type, type2 = t2->type,
7055 w = cand1, l = cand2;
7057 type1 = t2->type, type2 = t1->type,
7058 w = cand2, l = cand1;
7062 warning (OPT_Wsign_promo, "passing %qT chooses %qT over %qT",
7063 type, type1, type2);
7064 warning (OPT_Wsign_promo, " in call to %qD", w->fn);
7070 if (winner && comp != winner)
7079 /* warn about confusing overload resolution for user-defined conversions,
7080 either between a constructor and a conversion op, or between two
7082 if (winner && warn_conversion && cand1->second_conv
7083 && (!DECL_CONSTRUCTOR_P (cand1->fn) || !DECL_CONSTRUCTOR_P (cand2->fn))
7084 && winner != compare_ics (cand1->second_conv, cand2->second_conv))
7086 struct z_candidate *w, *l;
7087 bool give_warning = false;
7090 w = cand1, l = cand2;
7092 w = cand2, l = cand1;
7094 /* We don't want to complain about `X::operator T1 ()'
7095 beating `X::operator T2 () const', when T2 is a no less
7096 cv-qualified version of T1. */
7097 if (DECL_CONTEXT (w->fn) == DECL_CONTEXT (l->fn)
7098 && !DECL_CONSTRUCTOR_P (w->fn) && !DECL_CONSTRUCTOR_P (l->fn))
7100 tree t = TREE_TYPE (TREE_TYPE (l->fn));
7101 tree f = TREE_TYPE (TREE_TYPE (w->fn));
7103 if (TREE_CODE (t) == TREE_CODE (f) && POINTER_TYPE_P (t))
7108 if (!comp_ptr_ttypes (t, f))
7109 give_warning = true;
7112 give_warning = true;
7118 tree source = source_type (w->convs[0]);
7119 if (! DECL_CONSTRUCTOR_P (w->fn))
7120 source = TREE_TYPE (source);
7121 if (warning (OPT_Wconversion, "choosing %qD over %qD", w->fn, l->fn)
7122 && warning (OPT_Wconversion, " for conversion from %qT to %qT",
7123 source, w->second_conv->type))
7125 inform (input_location, " because conversion sequence for the argument is better");
7136 F1 is a non-template function and F2 is a template function
7139 if (!cand1->template_decl && cand2->template_decl)
7141 else if (cand1->template_decl && !cand2->template_decl)
7145 F1 and F2 are template functions and the function template for F1 is
7146 more specialized than the template for F2 according to the partial
7149 if (cand1->template_decl && cand2->template_decl)
7151 winner = more_specialized_fn
7152 (TI_TEMPLATE (cand1->template_decl),
7153 TI_TEMPLATE (cand2->template_decl),
7154 /* [temp.func.order]: The presence of unused ellipsis and default
7155 arguments has no effect on the partial ordering of function
7156 templates. add_function_candidate() will not have
7157 counted the "this" argument for constructors. */
7158 cand1->num_convs + DECL_CONSTRUCTOR_P (cand1->fn));
7164 the context is an initialization by user-defined conversion (see
7165 _dcl.init_ and _over.match.user_) and the standard conversion
7166 sequence from the return type of F1 to the destination type (i.e.,
7167 the type of the entity being initialized) is a better conversion
7168 sequence than the standard conversion sequence from the return type
7169 of F2 to the destination type. */
7171 if (cand1->second_conv)
7173 winner = compare_ics (cand1->second_conv, cand2->second_conv);
7178 /* Check whether we can discard a builtin candidate, either because we
7179 have two identical ones or matching builtin and non-builtin candidates.
7181 (Pedantically in the latter case the builtin which matched the user
7182 function should not be added to the overload set, but we spot it here.
7185 ... the builtin candidates include ...
7186 - do not have the same parameter type list as any non-template
7187 non-member candidate. */
7189 if (TREE_CODE (cand1->fn) == IDENTIFIER_NODE
7190 || TREE_CODE (cand2->fn) == IDENTIFIER_NODE)
7192 for (i = 0; i < len; ++i)
7193 if (!same_type_p (cand1->convs[i]->type,
7194 cand2->convs[i]->type))
7196 if (i == cand1->num_convs)
7198 if (cand1->fn == cand2->fn)
7199 /* Two built-in candidates; arbitrarily pick one. */
7201 else if (TREE_CODE (cand1->fn) == IDENTIFIER_NODE)
7202 /* cand1 is built-in; prefer cand2. */
7205 /* cand2 is built-in; prefer cand1. */
7210 /* If the two function declarations represent the same function (this can
7211 happen with declarations in multiple scopes and arg-dependent lookup),
7212 arbitrarily choose one. But first make sure the default args we're
7214 if (DECL_P (cand1->fn) && DECL_P (cand2->fn)
7215 && equal_functions (cand1->fn, cand2->fn))
7217 tree parms1 = TYPE_ARG_TYPES (TREE_TYPE (cand1->fn));
7218 tree parms2 = TYPE_ARG_TYPES (TREE_TYPE (cand2->fn));
7220 gcc_assert (!DECL_CONSTRUCTOR_P (cand1->fn));
7222 for (i = 0; i < len; ++i)
7224 /* Don't crash if the fn is variadic. */
7227 parms1 = TREE_CHAIN (parms1);
7228 parms2 = TREE_CHAIN (parms2);
7232 parms1 = TREE_CHAIN (parms1);
7234 parms2 = TREE_CHAIN (parms2);
7238 if (!cp_tree_equal (TREE_PURPOSE (parms1),
7239 TREE_PURPOSE (parms2)))
7243 permerror (input_location, "default argument mismatch in "
7244 "overload resolution");
7245 inform (input_location,
7246 " candidate 1: %q+#F", cand1->fn);
7247 inform (input_location,
7248 " candidate 2: %q+#F", cand2->fn);
7251 add_warning (cand1, cand2);
7254 parms1 = TREE_CHAIN (parms1);
7255 parms2 = TREE_CHAIN (parms2);
7263 /* Extension: If the worst conversion for one candidate is worse than the
7264 worst conversion for the other, take the first. */
7267 conversion_rank rank1 = cr_identity, rank2 = cr_identity;
7268 struct z_candidate *w = 0, *l = 0;
7270 for (i = 0; i < len; ++i)
7272 if (CONVERSION_RANK (cand1->convs[i+off1]) > rank1)
7273 rank1 = CONVERSION_RANK (cand1->convs[i+off1]);
7274 if (CONVERSION_RANK (cand2->convs[i + off2]) > rank2)
7275 rank2 = CONVERSION_RANK (cand2->convs[i + off2]);
7278 winner = 1, w = cand1, l = cand2;
7280 winner = -1, w = cand2, l = cand1;
7285 pedwarn (input_location, 0,
7286 "ISO C++ says that these are ambiguous, even "
7287 "though the worst conversion for the first is better than "
7288 "the worst conversion for the second:");
7289 print_z_candidate (_("candidate 1:"), w);
7290 print_z_candidate (_("candidate 2:"), l);
7298 gcc_assert (!winner);
7302 /* Given a list of candidates for overloading, find the best one, if any.
7303 This algorithm has a worst case of O(2n) (winner is last), and a best
7304 case of O(n/2) (totally ambiguous); much better than a sorting
7307 static struct z_candidate *
7308 tourney (struct z_candidate *candidates)
7310 struct z_candidate *champ = candidates, *challenger;
7312 int champ_compared_to_predecessor = 0;
7314 /* Walk through the list once, comparing each current champ to the next
7315 candidate, knocking out a candidate or two with each comparison. */
7317 for (challenger = champ->next; challenger; )
7319 fate = joust (champ, challenger, 0);
7321 challenger = challenger->next;
7326 champ = challenger->next;
7329 champ_compared_to_predecessor = 0;
7334 champ_compared_to_predecessor = 1;
7337 challenger = champ->next;
7341 /* Make sure the champ is better than all the candidates it hasn't yet
7342 been compared to. */
7344 for (challenger = candidates;
7346 && !(champ_compared_to_predecessor && challenger->next == champ);
7347 challenger = challenger->next)
7349 fate = joust (champ, challenger, 0);
7357 /* Returns nonzero if things of type FROM can be converted to TO. */
7360 can_convert (tree to, tree from)
7362 return can_convert_arg (to, from, NULL_TREE, LOOKUP_IMPLICIT);
7365 /* Returns nonzero if ARG (of type FROM) can be converted to TO. */
7368 can_convert_arg (tree to, tree from, tree arg, int flags)
7374 /* Get the high-water mark for the CONVERSION_OBSTACK. */
7375 p = conversion_obstack_alloc (0);
7377 t = implicit_conversion (to, from, arg, /*c_cast_p=*/false,
7379 ok_p = (t && !t->bad_p);
7381 /* Free all the conversions we allocated. */
7382 obstack_free (&conversion_obstack, p);
7387 /* Like can_convert_arg, but allows dubious conversions as well. */
7390 can_convert_arg_bad (tree to, tree from, tree arg, int flags)
7395 /* Get the high-water mark for the CONVERSION_OBSTACK. */
7396 p = conversion_obstack_alloc (0);
7397 /* Try to perform the conversion. */
7398 t = implicit_conversion (to, from, arg, /*c_cast_p=*/false,
7400 /* Free all the conversions we allocated. */
7401 obstack_free (&conversion_obstack, p);
7406 /* Convert EXPR to TYPE. Return the converted expression.
7408 Note that we allow bad conversions here because by the time we get to
7409 this point we are committed to doing the conversion. If we end up
7410 doing a bad conversion, convert_like will complain. */
7413 perform_implicit_conversion_flags (tree type, tree expr, tsubst_flags_t complain, int flags)
7418 if (error_operand_p (expr))
7419 return error_mark_node;
7421 /* Get the high-water mark for the CONVERSION_OBSTACK. */
7422 p = conversion_obstack_alloc (0);
7424 conv = implicit_conversion (type, TREE_TYPE (expr), expr,
7430 if (complain & tf_error)
7432 /* If expr has unknown type, then it is an overloaded function.
7433 Call instantiate_type to get good error messages. */
7434 if (TREE_TYPE (expr) == unknown_type_node)
7435 instantiate_type (type, expr, complain);
7436 else if (invalid_nonstatic_memfn_p (expr, complain))
7437 /* We gave an error. */;
7439 error ("could not convert %qE to %qT", expr, type);
7441 expr = error_mark_node;
7443 else if (processing_template_decl)
7445 /* In a template, we are only concerned about determining the
7446 type of non-dependent expressions, so we do not have to
7447 perform the actual conversion. */
7448 if (TREE_TYPE (expr) != type)
7449 expr = build_nop (type, expr);
7452 expr = convert_like (conv, expr, complain);
7454 /* Free all the conversions we allocated. */
7455 obstack_free (&conversion_obstack, p);
7461 perform_implicit_conversion (tree type, tree expr, tsubst_flags_t complain)
7463 return perform_implicit_conversion_flags (type, expr, complain, LOOKUP_IMPLICIT);
7466 /* Convert EXPR to TYPE (as a direct-initialization) if that is
7467 permitted. If the conversion is valid, the converted expression is
7468 returned. Otherwise, NULL_TREE is returned, except in the case
7469 that TYPE is a class type; in that case, an error is issued. If
7470 C_CAST_P is true, then this direction initialization is taking
7471 place as part of a static_cast being attempted as part of a C-style
7475 perform_direct_initialization_if_possible (tree type,
7478 tsubst_flags_t complain)
7483 if (type == error_mark_node || error_operand_p (expr))
7484 return error_mark_node;
7487 If the destination type is a (possibly cv-qualified) class type:
7489 -- If the initialization is direct-initialization ...,
7490 constructors are considered. ... If no constructor applies, or
7491 the overload resolution is ambiguous, the initialization is
7493 if (CLASS_TYPE_P (type))
7495 VEC(tree,gc) *args = make_tree_vector_single (expr);
7496 expr = build_special_member_call (NULL_TREE, complete_ctor_identifier,
7497 &args, type, LOOKUP_NORMAL, complain);
7498 release_tree_vector (args);
7499 return build_cplus_new (type, expr);
7502 /* Get the high-water mark for the CONVERSION_OBSTACK. */
7503 p = conversion_obstack_alloc (0);
7505 conv = implicit_conversion (type, TREE_TYPE (expr), expr,
7508 if (!conv || conv->bad_p)
7511 expr = convert_like_real (conv, expr, NULL_TREE, 0, 0,
7512 /*issue_conversion_warnings=*/false,
7514 tf_warning_or_error);
7516 /* Free all the conversions we allocated. */
7517 obstack_free (&conversion_obstack, p);
7522 /* DECL is a VAR_DECL whose type is a REFERENCE_TYPE. The reference
7523 is being bound to a temporary. Create and return a new VAR_DECL
7524 with the indicated TYPE; this variable will store the value to
7525 which the reference is bound. */
7528 make_temporary_var_for_ref_to_temp (tree decl, tree type)
7532 /* Create the variable. */
7533 var = create_temporary_var (type);
7535 /* Register the variable. */
7536 if (TREE_STATIC (decl))
7538 /* Namespace-scope or local static; give it a mangled name. */
7541 TREE_STATIC (var) = 1;
7542 name = mangle_ref_init_variable (decl);
7543 DECL_NAME (var) = name;
7544 SET_DECL_ASSEMBLER_NAME (var, name);
7545 var = pushdecl_top_level (var);
7548 /* Create a new cleanup level if necessary. */
7549 maybe_push_cleanup_level (type);
7554 /* EXPR is the initializer for a variable DECL of reference or
7555 std::initializer_list type. Create, push and return a new VAR_DECL
7556 for the initializer so that it will live as long as DECL. Any
7557 cleanup for the new variable is returned through CLEANUP, and the
7558 code to initialize the new variable is returned through INITP. */
7561 set_up_extended_ref_temp (tree decl, tree expr, tree *cleanup, tree *initp)
7567 /* Create the temporary variable. */
7568 type = TREE_TYPE (expr);
7569 var = make_temporary_var_for_ref_to_temp (decl, type);
7570 layout_decl (var, 0);
7571 /* If the rvalue is the result of a function call it will be
7572 a TARGET_EXPR. If it is some other construct (such as a
7573 member access expression where the underlying object is
7574 itself the result of a function call), turn it into a
7575 TARGET_EXPR here. It is important that EXPR be a
7576 TARGET_EXPR below since otherwise the INIT_EXPR will
7577 attempt to make a bitwise copy of EXPR to initialize
7579 if (TREE_CODE (expr) != TARGET_EXPR)
7580 expr = get_target_expr (expr);
7581 /* Create the INIT_EXPR that will initialize the temporary
7583 init = build2 (INIT_EXPR, type, var, expr);
7584 if (at_function_scope_p ())
7586 add_decl_expr (var);
7588 if (TREE_STATIC (var))
7589 init = add_stmt_to_compound (init, register_dtor_fn (var));
7591 *cleanup = cxx_maybe_build_cleanup (var);
7593 /* We must be careful to destroy the temporary only
7594 after its initialization has taken place. If the
7595 initialization throws an exception, then the
7596 destructor should not be run. We cannot simply
7597 transform INIT into something like:
7599 (INIT, ({ CLEANUP_STMT; }))
7601 because emit_local_var always treats the
7602 initializer as a full-expression. Thus, the
7603 destructor would run too early; it would run at the
7604 end of initializing the reference variable, rather
7605 than at the end of the block enclosing the
7608 The solution is to pass back a cleanup expression
7609 which the caller is responsible for attaching to
7610 the statement tree. */
7614 rest_of_decl_compilation (var, /*toplev=*/1, at_eof);
7615 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type))
7616 static_aggregates = tree_cons (NULL_TREE, var,
7624 /* Convert EXPR to the indicated reference TYPE, in a way suitable for
7625 initializing a variable of that TYPE. If DECL is non-NULL, it is
7626 the VAR_DECL being initialized with the EXPR. (In that case, the
7627 type of DECL will be TYPE.) If DECL is non-NULL, then CLEANUP must
7628 also be non-NULL, and with *CLEANUP initialized to NULL. Upon
7629 return, if *CLEANUP is no longer NULL, it will be an expression
7630 that should be pushed as a cleanup after the returned expression
7631 is used to initialize DECL.
7633 Return the converted expression. */
7636 initialize_reference (tree type, tree expr, tree decl, tree *cleanup,
7637 tsubst_flags_t complain)
7642 if (type == error_mark_node || error_operand_p (expr))
7643 return error_mark_node;
7645 /* Get the high-water mark for the CONVERSION_OBSTACK. */
7646 p = conversion_obstack_alloc (0);
7648 conv = reference_binding (type, TREE_TYPE (expr), expr, /*c_cast_p=*/false,
7650 if (!conv || conv->bad_p)
7652 if (complain & tf_error)
7654 if (!(TYPE_QUALS (TREE_TYPE (type)) & TYPE_QUAL_CONST)
7655 && !TYPE_REF_IS_RVALUE (type)
7656 && !real_lvalue_p (expr))
7657 error ("invalid initialization of non-const reference of "
7658 "type %qT from an rvalue of type %qT",
7659 type, TREE_TYPE (expr));
7661 error ("invalid initialization of reference of type "
7662 "%qT from expression of type %qT", type,
7665 return error_mark_node;
7668 /* If DECL is non-NULL, then this special rule applies:
7672 The temporary to which the reference is bound or the temporary
7673 that is the complete object to which the reference is bound
7674 persists for the lifetime of the reference.
7676 The temporaries created during the evaluation of the expression
7677 initializing the reference, except the temporary to which the
7678 reference is bound, are destroyed at the end of the
7679 full-expression in which they are created.
7681 In that case, we store the converted expression into a new
7682 VAR_DECL in a new scope.
7684 However, we want to be careful not to create temporaries when
7685 they are not required. For example, given:
7688 struct D : public B {};
7692 there is no need to copy the return value from "f"; we can just
7693 extend its lifetime. Similarly, given:
7696 struct T { operator S(); };
7700 we can extend the lifetime of the return value of the conversion
7702 gcc_assert (conv->kind == ck_ref_bind);
7706 tree base_conv_type;
7708 /* Skip over the REF_BIND. */
7709 conv = conv->u.next;
7710 /* If the next conversion is a BASE_CONV, skip that too -- but
7711 remember that the conversion was required. */
7712 if (conv->kind == ck_base)
7714 base_conv_type = conv->type;
7715 conv = conv->u.next;
7718 base_conv_type = NULL_TREE;
7719 /* Perform the remainder of the conversion. */
7720 expr = convert_like_real (conv, expr,
7721 /*fn=*/NULL_TREE, /*argnum=*/0,
7723 /*issue_conversion_warnings=*/true,
7725 tf_warning_or_error);
7726 if (error_operand_p (expr))
7727 expr = error_mark_node;
7730 if (!lvalue_or_rvalue_with_address_p (expr))
7733 var = set_up_extended_ref_temp (decl, expr, cleanup, &init);
7734 /* Use its address to initialize the reference variable. */
7735 expr = build_address (var);
7737 expr = convert_to_base (expr,
7738 build_pointer_type (base_conv_type),
7739 /*check_access=*/true,
7741 expr = build2 (COMPOUND_EXPR, TREE_TYPE (expr), init, expr);
7744 /* Take the address of EXPR. */
7745 expr = cp_build_unary_op (ADDR_EXPR, expr, 0, tf_warning_or_error);
7746 /* If a BASE_CONV was required, perform it now. */
7748 expr = (perform_implicit_conversion
7749 (build_pointer_type (base_conv_type), expr,
7750 tf_warning_or_error));
7751 expr = build_nop (type, expr);
7755 /* Perform the conversion. */
7756 expr = convert_like (conv, expr, tf_warning_or_error);
7758 /* Free all the conversions we allocated. */
7759 obstack_free (&conversion_obstack, p);
7764 /* Returns true iff TYPE is some variant of std::initializer_list. */
7767 is_std_init_list (tree type)
7769 return (CLASS_TYPE_P (type)
7770 && CP_TYPE_CONTEXT (type) == std_node
7771 && strcmp (TYPE_NAME_STRING (type), "initializer_list") == 0);
7774 /* Returns true iff DECL is a list constructor: i.e. a constructor which
7775 will accept an argument list of a single std::initializer_list<T>. */
7778 is_list_ctor (tree decl)
7780 tree args = FUNCTION_FIRST_USER_PARMTYPE (decl);
7783 if (!args || args == void_list_node)
7786 arg = non_reference (TREE_VALUE (args));
7787 if (!is_std_init_list (arg))
7790 args = TREE_CHAIN (args);
7792 if (args && args != void_list_node && !TREE_PURPOSE (args))
7793 /* There are more non-defaulted parms. */
7799 #include "gt-cp-call.h"