| blob | 2c779733f0d9679bd3e15a29d4c988c49d03e6b3 |
1 /* Functions related to invoking methods and overloaded functions.
2 Copyright (C) 1987-2014 Free Software Foundation, Inc.
3 Contributed by Michael Tiemann (tiemann@cygnus.com) and
4 modified by Brendan Kehoe (brendan@cygnus.com).
6 This file is part of GCC.
8 GCC is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 3, or (at your option)
11 any later version.
13 GCC is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with GCC; see the file COPYING3. If not see
20 <http://www.gnu.org/licenses/>. */
23 /* High-level class interface. */
45 /* The various kinds of conversion. */
48 ck_identity,
49 ck_lvalue,
50 ck_qual,
51 ck_std,
52 ck_ptr,
53 ck_pmem,
54 ck_base,
55 ck_ref_bind,
56 ck_user,
57 ck_ambig,
58 ck_list,
59 ck_aggr,
60 ck_rvalue
63 /* The rank of the conversion. Order of the enumerals matters; better
64 conversions should come earlier in the list. */
67 cr_identity,
68 cr_exact,
69 cr_promotion,
70 cr_std,
71 cr_pbool,
72 cr_user,
73 cr_ellipsis,
74 cr_bad
77 /* An implicit conversion sequence, in the sense of [over.best.ics].
78 The first conversion to be performed is at the end of the chain.
79 That conversion is always a cr_identity conversion. */
83 /* The kind of conversion represented by this step. */
84 conversion_kind kind;
85 /* The rank of this conversion. */
86 conversion_rank rank;
90 /* True if this conversion would be permitted with a bending of
91 language standards, e.g. disregarding pointer qualifiers or
92 converting integers to pointers. */
94 /* If KIND is ck_ref_bind ck_base_conv, true to indicate that a
95 temporary should be created to hold the result of the
96 conversion. */
98 /* If KIND is ck_ptr or ck_pmem, true to indicate that a conversion
99 from a pointer-to-derived to pointer-to-base is being performed. */
101 /* If KIND is ck_ref_bind, true when either an lvalue reference is
102 being bound to an lvalue expression or an rvalue reference is
103 being bound to an rvalue expression. If KIND is ck_rvalue,
104 true when we should treat an lvalue as an rvalue (12.8p33). If
105 KIND is ck_base, always false. */
108 /* The type of the expression resulting from the conversion. */
109 tree type;
111 /* The next conversion in the chain. Since the conversions are
112 arranged from outermost to innermost, the NEXT conversion will
113 actually be performed before this conversion. This variant is
114 used only when KIND is neither ck_identity, ck_ambig nor
115 ck_list. Please use the next_conversion function instead
116 of using this field directly. */
118 /* The expression at the beginning of the conversion chain. This
119 variant is used only if KIND is ck_identity or ck_ambig. */
120 tree expr;
121 /* The array of conversions for an initializer_list, so this
122 variant is used only when KIN D is ck_list. */
125 /* The function candidate corresponding to this conversion
126 sequence. This field is only used if KIND is ck_user. */
128 };
130 #define CONVERSION_RANK(NODE) \
131 ((NODE)->bad_p ? cr_bad \
132 : (NODE)->ellipsis_p ? cr_ellipsis \
133 : (NODE)->user_conv_p ? cr_user \
134 : (NODE)->rank)
136 #define BAD_CONVERSION_RANK(NODE) \
137 ((NODE)->ellipsis_p ? cr_ellipsis \
138 : (NODE)->user_conv_p ? cr_user \
139 : (NODE)->rank)
148 tsubst_flags_t);
152 #define convert_like(CONV, EXPR, COMPLAIN) \
153 convert_like_real ((CONV), (EXPR), NULL_TREE, 0, 0, \
156 #define convert_like_with_context(CONV, EXPR, FN, ARGNO, COMPLAIN ) \
157 convert_like_real ((CONV), (EXPR), (FN), (ARGNO), 0, \
165 tsubst_flags_t);
180 static void add_builtin_candidates
183 static void add_builtin_candidate
187 static void build_builtin_candidate
197 tsubst_flags_t);
200 tsubst_flags_t);
220 tsubst_flags_t);
224 /* Returns nonzero iff the destructor name specified in NAME matches BASETYPE.
225 NAME can take many forms... */
227 bool
229 {
230 /* Just accept something we've already complained about. */
239 {
245 else
247 }
248 else
249 {
250 /* In the case of:
252 template <class T> struct S { ~S(); };
253 int i;
254 i.~S();
256 NAME will be a class template. */
259 }
264 }
266 /* We want the address of a function or method. We avoid creating a
267 pointer-to-member function. */
269 tree
271 {
274 /* We have to do these by hand to avoid real pointer to member
275 functions. */
277 {
279 {
283 complain);
284 }
286 }
287 else
291 }
293 /* Build a CALL_EXPR, we can handle FUNCTION_TYPEs, METHOD_TYPEs, or
294 POINTER_TYPE to those. Note, pointer to member function types
295 (TYPE_PTRMEMFUNC_P) must be handled by our callers. There are
296 two variants. build_call_a is the primitive taking an array of
297 arguments, while build_call_n is a wrapper that handles varargs. */
299 tree
301 {
304 else
305 {
315 }
316 }
318 /* Update various flags in cfun and the call itself based on what is being
319 called. Split out of build_call_a so that bot_manip can use it too. */
321 void
323 {
327 /* We check both the decl and the type; a function may be known not to
328 throw without being declared throw(). */
339 }
341 tree
343 {
344 tree decl;
345 tree result_type;
346 tree fntype;
356 /* An rvalue has no cv-qualifiers. */
367 {
368 /* We invoke build_call directly for several library
369 functions. These may have been declared normally if
370 we're building libgcc, so we can't just check
371 DECL_ARTIFICIAL. */
376 }
384 /* Don't pass empty class objects by value. This is useful
385 for tags in STL, which are used to control overload resolution.
386 We don't need to handle other cases of copying empty classes. */
389 {
393 {
397 }
398 }
401 }
403 /* Build something of the form ptr->method (args)
404 or object.method (args). This can also build
405 calls to constructors, and find friends.
407 Member functions always take their class variable
408 as a pointer.
410 INSTANCE is a class instance.
412 NAME is the name of the method desired, usually an IDENTIFIER_NODE.
414 PARMS help to figure out what that NAME really refers to.
416 BASETYPE_PATH, if non-NULL, contains a chain from the type of INSTANCE
417 down to the real instance type to use for access checking. We need this
418 information to get protected accesses correct.
420 FLAGS is the logical disjunction of zero or more LOOKUP_
421 flags. See cp-tree.h for more info.
423 If this is all OK, calls build_function_call with the resolved
424 member function.
426 This function must also handle being called to perform
427 initialization, promotion/coercion of arguments, and
428 instantiation of default parameters.
430 Note that NAME may refer to an instance variable name. If
431 `operator()()' is defined for the type of that field, then we return
432 that result. */
434 /* New overloading code. */
442 };
444 /* Information for providing diagnostics about why overloading failed. */
447 rr_none,
448 rr_arity,
449 rr_explicit_conversion,
450 rr_template_conversion,
451 rr_arg_conversion,
452 rr_bad_arg_conversion,
453 rr_template_unification,
454 rr_invalid_copy
455 };
458 /* The index of the argument, 0-based. */
460 /* The type of the actual argument. */
461 tree from_type;
462 /* The type of the formal argument. */
463 tree to_type;
464 };
469 /* Information about an arity mismatch. */
471 /* The expected number of arguments. */
473 /* The actual number of arguments in the call. */
475 /* Whether the call was a varargs call. */
478 /* Information about an argument conversion mismatch. */
480 /* Same, but for bad argument conversions. */
482 /* Information about template unification failures. These are the
483 parameters passed to fn_type_unification. */
485 tree tmpl;
486 tree explicit_targs;
490 tree return_type;
491 unification_kind_t strict;
494 /* Information about template instantiation failures. These are the
495 parameters passed to instantiate_template. */
497 tree tmpl;
498 tree targs;
501 };
504 /* The FUNCTION_DECL that will be called if this candidate is
505 selected by overload resolution. */
506 tree fn;
507 /* If not NULL_TREE, the first argument to use when calling this
508 function. */
509 tree first_arg;
510 /* The rest of the arguments to use when calling this function. If
511 there are no further arguments this may be NULL or it may be an
512 empty vector. */
514 /* The implicit conversion sequences for each of the arguments to
515 FN. */
517 /* The number of implicit conversion sequences. */
519 /* If FN is a user-defined conversion, the standard conversion
520 sequence from the type returned by FN to the desired destination
521 type. */
525 /* If FN is a member function, the binfo indicating the path used to
526 qualify the name of FN at the call site. This path is used to
527 determine whether or not FN is accessible if it is selected by
528 overload resolution. The DECL_CONTEXT of FN will always be a
529 (possibly improper) base of this binfo. */
530 tree access_path;
531 /* If FN is a non-static member function, the binfo indicating the
532 subobject to which the `this' pointer should be converted if FN
533 is selected by overload resolution. The type pointed to by
534 the `this' pointer must correspond to the most derived class
535 indicated by the CONVERSION_PATH. */
536 tree conversion_path;
537 tree template_decl;
538 tree explicit_targs;
541 };
543 /* Returns true iff T is a null pointer constant in the sense of
544 [conv.ptr]. */
546 bool
548 {
549 /* [conv.ptr]
551 A null pointer constant is an integral constant expression
552 (_expr.const_) rvalue of integer type that evaluates to zero or
553 an rvalue of type std::nullptr_t. */
557 {
558 /* Core issue 903 says only literal 0 is a null pointer constant. */
564 }
566 }
568 /* Returns true iff T is a null member pointer value (4.11). */
570 bool
572 {
581 else
583 }
585 /* Returns nonzero if PARMLIST consists of only default parms,
586 ellipsis, and/or undeduced parameter packs. */
588 bool
590 {
597 }
599 /* Allocate N bytes of memory from the conversion obstack. The memory
600 is zeroed before being returned. */
604 {
607 {
610 }
614 }
616 /* Allocate rejection reasons. */
620 {
625 }
629 {
635 }
639 {
646 }
650 {
657 }
661 {
667 }
671 {
677 }
684 {
691 /* Copy args to our own storage. */
699 }
703 {
705 }
709 {
712 }
714 /* Dynamically allocate a conversion. */
718 {
723 }
725 #ifdef ENABLE_CHECKING
727 /* Make sure that all memory on the conversion obstack has been
728 freed. */
730 void
732 {
736 }
740 /* Dynamically allocate an array of N conversions. */
744 {
746 }
750 {
754 /* Note that the caller is responsible for filling in t->cand for
755 user-defined conversions. */
761 {
777 }
783 }
785 /* Represent a conversion from CTOR, a braced-init-list, to TYPE, a
786 specialization of std::initializer_list<T>, if such a conversion is
787 possible. */
791 {
797 tree val;
799 /* Within a list-initialization we can have more user-defined
800 conversions. */
802 /* But no narrowing conversions. */
806 {
807 conversion *sub
814 }
822 {
830 }
833 }
835 /* Return the next conversion of the conversion chain (if applicable),
836 or NULL otherwise. Please use this function instead of directly
837 accessing fields of struct conversion. */
841 {
848 }
850 /* Subroutine of build_aggr_conv: check whether CTOR, a braced-init-list,
851 is a valid aggregate initializer for array type ATYPE. */
853 static bool
855 {
859 {
865 else
867 complain);
870 }
872 }
874 /* Represent a conversion from CTOR, a braced-init-list, to TYPE, an
875 aggregate class, if such a conversion is possible. */
879 {
890 {
892 tree val;
897 else
898 {
902 }
908 else
910 complain);
917 }
928 }
930 /* Represent a conversion from CTOR, a braced-init-list, to TYPE, an
931 array type, if such a conversion is possible. */
935 {
940 tree val;
946 {
950 }
953 {
954 conversion *sub
966 }
975 }
977 /* Represent a conversion from CTOR, a braced-init-list, to TYPE, a
978 complex type, if such a conversion is possible. */
982 tsubst_flags_t complain)
983 {
988 tree val;
997 {
998 conversion *sub
1010 }
1019 }
1021 /* Build a representation of the identity conversion from EXPR to
1022 itself. The TYPE should match the type of EXPR, if EXPR is non-NULL. */
1026 {
1034 }
1036 /* Converting from EXPR to TYPE was ambiguous in the sense that there
1037 were multiple user-defined conversions to accomplish the job.
1038 Build a conversion that indicates that ambiguity. */
1042 {
1050 }
1052 tree
1054 {
1058 }
1060 /* Returns the standard conversion path (see [conv]) from type FROM to type
1061 TO, if any. For proper handling of null pointer constants, you must
1062 also pass the expression EXPR to convert from. If C_CAST_P is true,
1063 this conversion is coming from a C-style cast. */
1068 {
1072 tree qualified_to;
1076 {
1079 }
1086 {
1092 }
1099 {
1103 }
1105 {
1107 {
1108 tree bitfield_type;
1111 {
1114 }
1115 }
1119 }
1121 /* Allow conversion between `__complex__' data types. */
1123 {
1124 /* The standard conversion sequence to convert FROM to TO is
1125 the standard conversion sequence to perform componentwise
1126 conversion. */
1131 {
1134 }
1135 else
1139 }
1142 {
1146 }
1148 /* [conv.ptr]
1149 A null pointer constant can be converted to a pointer type; ... A
1150 null pointer constant of integral type can be converted to an
1151 rvalue of type std::nullptr_t. */
1158 {
1159 /* For backwards brain damage compatibility, allow interconversion of
1160 pointers and integers with a pedwarn. */
1163 }
1165 {
1166 /* For backwards brain damage compatibility, allow interconversion of
1167 enums and integers with a pedwarn. */
1170 }
1173 {
1174 tree to_pointee;
1175 tree from_pointee;
1180 ;
1184 {
1186 from = build_pointer_type
1190 }
1192 {
1197 && (same_type_ignoring_top_level_qualifiers_p
1200 {
1204 }
1207 }
1210 /* [conv.ptr]
1212 An rvalue of type "pointer to cv D," where D is a
1213 class type, can be converted to an rvalue of type
1214 "pointer to cv B," where B is a base class (clause
1215 _class.derived_) of D. If B is an inaccessible
1216 (clause _class.access_) or ambiguous
1217 (_class.member.lookup_) base class of D, a program
1218 that necessitates this conversion is ill-formed.
1219 Therefore, we use DERIVED_FROM_P, and do not check
1220 access or uniqueness. */
1222 {
1223 from =
1229 }
1232 {
1235 }
1236 else
1237 {
1240 }
1245 /* In a C-style cast, we ignore CV-qualification because we
1246 are allowed to perform a static_cast followed by a
1247 const_cast. */
1252 /* converting from string constant to char *. */
1254 /* Allow conversions among compatible ObjC pointer types (base
1255 conversions have been already handled above). */
1260 {
1263 }
1264 else
1268 }
1270 {
1282 tbase,
1288 }
1290 {
1291 /* [conv.bool]
1293 An rvalue of arithmetic, unscoped enumeration, pointer, or
1294 pointer to member type can be converted to an rvalue of type
1295 bool. ... An rvalue of type std::nullptr_t can be converted
1296 to an rvalue of type bool; */
1302 {
1311 }
1314 }
1315 /* We don't check for ENUMERAL_TYPE here because there are no standard
1316 conversions to enum type. */
1317 /* As an extension, allow conversion to complex type. */
1319 {
1326 /* Give this a better rank if it's a promotion. */
1330 }
1336 {
1340 /* The derived-to-base conversion indicates the initialization
1341 of a parameter with base type from an object of a derived
1342 type. A temporary object is created to hold the result of
1343 the conversion unless we're binding directly to a reference. */
1345 }
1346 else
1353 }
1355 /* Returns nonzero if T1 is reference-related to T2. */
1357 bool
1359 {
1366 /* [dcl.init.ref]
1368 Given types "cv1 T1" and "cv2 T2," "cv1 T1" is reference-related
1369 to "cv2 T2" if T1 is the same type as T2, or T1 is a base class
1370 of T2. */
1374 }
1376 /* Returns nonzero if T1 is reference-compatible with T2. */
1378 static bool
1380 {
1381 /* [dcl.init.ref]
1383 "cv1 T1" is reference compatible with "cv2 T2" if T1 is
1384 reference-related to T2 and cv1 is the same cv-qualification as,
1385 or greater cv-qualification than, cv2. */
1388 }
1390 /* A reference of the indicated TYPE is being bound directly to the
1391 expression represented by the implicit conversion sequence CONV.
1392 Return a conversion sequence for this binding. */
1396 {
1397 tree t;
1404 /* [over.ics.rank]
1406 When a parameter of reference type binds directly
1407 (_dcl.init.ref_) to an argument expression, the implicit
1408 conversion sequence is the identity conversion, unless the
1409 argument expression has a type that is a derived class of the
1410 parameter type, in which case the implicit conversion sequence is
1411 a derived-to-base Conversion.
1413 If the parameter binds directly to the result of applying a
1414 conversion function to the argument expression, the implicit
1415 conversion sequence is a user-defined conversion sequence
1416 (_over.ics.user_), with the second standard conversion sequence
1417 either an identity conversion or, if the conversion function
1418 returns an entity of a type that is a derived class of the
1419 parameter type, a derived-to-base conversion. */
1421 {
1422 /* Represent the derived-to-base conversion. */
1424 /* We will actually be binding to the base-class subobject in
1425 the derived class, so we mark this conversion appropriately.
1426 That way, convert_like knows not to generate a temporary. */
1428 }
1430 }
1432 /* Returns the conversion path from type FROM to reference type TO for
1433 purposes of reference binding. For lvalue binding, either pass a
1434 reference type to FROM or an lvalue expression to EXPR. If the
1435 reference will be bound to a temporary, NEED_TEMPORARY_P is set for
1436 the conversion returned. If C_CAST_P is true, this
1437 conversion is coming from a C-style cast. */
1441 tsubst_flags_t complain)
1442 {
1446 tree tfrom;
1449 cp_lvalue_kind gl_kind;
1453 {
1458 }
1461 {
1467 {
1472 }
1473 }
1476 {
1481 else
1483 }
1485 {
1488 /* A class prvalue is not a glvalue. */
1490 }
1491 else
1499 /* Figure out whether or not the types are reference-related and
1500 reference compatible. We have do do this after stripping
1501 references from FROM. */
1503 /* If this is a C cast, first convert to an appropriately qualified
1504 type, so that we can later do a const_cast to the desired type. */
1510 /* Directly bind reference when target expression's type is compatible with
1511 the reference and expression is an lvalue. In DR391, the wording in
1512 [8.5.3/5 dcl.init.ref] is changed to also require direct bindings for
1513 const and rvalue references to rvalues of compatible class type.
1514 We should also do direct bindings for non-class xvalues. */
1516 && (is_lvalue
1520 && (gl_kind
1524 {
1525 /* [dcl.init.ref]
1527 If the initializer expression
1529 -- is an lvalue (but not an lvalue for a bit-field), and "cv1 T1"
1530 is reference-compatible with "cv2 T2,"
1532 the reference is bound directly to the initializer expression
1533 lvalue.
1535 [...]
1536 If the initializer expression is an rvalue, with T2 a class type,
1537 and "cv1 T1" is reference-compatible with "cv2 T2", the reference
1538 is bound to the object represented by the rvalue or to a sub-object
1539 within that object. */
1545 /* The top-level caller requested that we pretend that the lvalue
1546 be treated as an rvalue. */
1549 /* Handle rvalue reference to function properly. */
1550 conv->rvaluedness_matches_p
1552 else
1553 conv->rvaluedness_matches_p
1558 /* For the purposes of overload resolution, we ignore the fact
1559 this expression is a bitfield or packed field. (In particular,
1560 [over.ics.ref] says specifically that a function with a
1561 non-const reference parameter is viable even if the
1562 argument is a bitfield.)
1564 However, when we actually call the function we must create
1565 a temporary to which to bind the reference. If the
1566 reference is volatile, or isn't const, then we cannot make
1567 a temporary, so we just issue an error when the conversion
1568 actually occurs. */
1571 /* Don't allow binding of lvalues (other than function lvalues) to
1572 rvalue references. */
1579 }
1580 /* [class.conv.fct] A conversion function is never used to convert a
1581 (possibly cv-qualified) object to the (possibly cv-qualified) same
1582 object type (or a reference to it), to a (possibly cv-qualified) base
1583 class of that type (or a reference to it).... */
1586 {
1587 /* [dcl.init.ref]
1589 If the initializer expression
1591 -- has a class type (i.e., T2 is a class type) can be
1592 implicitly converted to an lvalue of type "cv3 T3," where
1593 "cv1 T1" is reference-compatible with "cv3 T3". (this
1594 conversion is selected by enumerating the applicable
1595 conversion functions (_over.match.ref_) and choosing the
1596 best one through overload resolution. (_over.match_).
1598 the reference is bound to the lvalue result of the conversion
1599 in the second case. */
1601 complain);
1604 }
1606 /* From this point on, we conceptually need temporaries, even if we
1607 elide them. Only the cases above are "direct bindings". */
1611 /* [over.ics.rank]
1613 When a parameter of reference type is not bound directly to an
1614 argument expression, the conversion sequence is the one required
1615 to convert the argument expression to the underlying type of the
1616 reference according to _over.best.ics_. Conceptually, this
1617 conversion sequence corresponds to copy-initializing a temporary
1618 of the underlying type with the argument expression. Any
1619 difference in top-level cv-qualification is subsumed by the
1620 initialization itself and does not constitute a conversion. */
1622 /* [dcl.init.ref]
1624 Otherwise, the reference shall be to a non-volatile const type.
1626 Under C++0x, [8.5.3/5 dcl.init.ref] it may also be an rvalue reference */
1630 /* [dcl.init.ref]
1632 Otherwise, a temporary of type "cv1 T1" is created and
1633 initialized from the initializer expression using the rules for a
1634 non-reference copy initialization. If T1 is reference-related to
1635 T2, cv1 must be the same cv-qualification as, or greater
1636 cv-qualification than, cv2; otherwise, the program is ill-formed. */
1640 /* We're generating a temporary now, but don't bind any more in the
1641 conversion (specifically, don't slice the temporary returned by a
1642 conversion operator). */
1645 /* Core issue 899: When [copy-]initializing a temporary to be bound
1646 to the first parameter of a copy constructor (12.8) called with
1647 a single argument in the context of direct-initialization,
1648 explicit conversion functions are also considered.
1650 So don't set LOOKUP_ONLYCONVERTING in that case. */
1661 /* This reference binding, unlike those above, requires the
1662 creation of a temporary. */
1667 }
1669 /* Returns the implicit conversion sequence (see [over.ics]) from type
1670 FROM to type TO. The optional expression EXPR may affect the
1671 conversion. FLAGS are the usual overloading flags. If C_CAST_P is
1672 true, this conversion is coming from a C-style cast. */
1677 {
1684 /* Other flags only apply to the primary function in overload
1685 resolution, or after we've chosen one. */
1690 /* FIXME: actually we don't want warnings either, but we can't just
1691 have 'complain &= ~(tf_warning|tf_error)' because it would cause
1692 the regression of, eg, g++.old-deja/g++.benjamin/16077.C.
1693 We really ought not to issue that warning until we've committed
1694 to that conversion. */
1699 else
1706 {
1710 /* As an extension, allow list-initialization of _Complex. */
1712 {
1716 }
1718 /* Allow conversion from an initializer-list with one element to a
1719 scalar type. */
1721 {
1723 tree elt;
1729 else
1735 {
1738 /* Too many levels of braces, i.e. '{{1}}'. */
1741 }
1742 }
1745 }
1751 {
1763 /* We used to try to bind a reference to a temporary here, but that
1764 is now handled after the recursive call to this function at the end
1765 of reference_binding. */
1767 }
1770 }
1772 /* Add a new entry to the list of candidates. Used by the add_*_candidate
1773 functions. ARGS will not be changed until a single candidate is
1774 selected. */
1782 {
1799 }
1801 /* Return the number of remaining arguments in the parameter list
1802 beginning with ARG. */
1804 static int
1806 {
1811 n++;
1814 }
1816 /* Create an overload candidate for the function or method FN called
1817 with the argument list FIRST_ARG/ARGS and add it to CANDIDATES.
1818 FLAGS is passed on to implicit_conversion.
1820 This does not change ARGS.
1822 CTYPE, if non-NULL, is the type we want to pretend this function
1823 comes from for purposes of overload resolution. */
1830 tsubst_flags_t complain)
1831 {
1835 tree parmnode;
1841 /* At this point we should not see any functions which haven't been
1842 explicitly declared, except for friend functions which will have
1843 been found using argument dependent lookup. */
1846 /* The `this', `in_chrg' and VTT arguments to constructors are not
1847 considered in overload resolution. */
1849 {
1853 {
1856 }
1857 }
1858 else
1864 /* 13.3.2 - Viable functions [over.match.viable]
1865 First, to be a viable function, a candidate function shall have enough
1866 parameters to agree in number with the arguments in the list.
1868 We need to check this first; otherwise, checking the ICSes might cause
1869 us to produce an ill-formed template instantiation. */
1873 {
1877 }
1881 {
1885 }
1886 /* When looking for a function from a subobject from an implicit
1887 copy/move constructor/operator=, don't consider anything that takes (a
1888 reference to) an unrelated type. See c++/44909 and core 1092. */
1890 {
1896 else
1899 {
1902 ctype))
1904 }
1906 /* This only applies at the top level. */
1908 }
1913 /* Second, for F to be a viable function, there shall exist for each
1914 argument an implicit conversion sequence that converts that argument
1915 to the corresponding parameter of F. */
1920 {
1922 tree arg;
1931 else
1940 {
1946 /* The type of the implicit object parameter ('this') for
1947 overload resolution is not always the same as for the
1948 function itself; conversion functions are considered to
1949 be members of the class being converted, and functions
1950 introduced by a using-declaration are considered to be
1951 members of the class that uses them.
1953 Since build_over_call ignores the ICS for the `this'
1954 parameter, we can just change the parm type. */
1956 {
1957 parmtype = cp_build_qualified_type
1960 {
1961 /* If the function has a ref-qualifier, the implicit
1962 object parameter has reference type. */
1965 }
1966 else
1967 {
1971 }
1972 }
1974 /* Core issue 899: When [copy-]initializing a temporary to be bound
1975 to the first parameter of a copy constructor (12.8) called with
1976 a single argument in the context of direct-initialization,
1977 explicit conversion functions are also considered.
1979 So set LOOKUP_COPY_PARM to let reference_binding know that
1980 it's being called in that context. We generalize the above
1981 to handle move constructors and template constructors as well;
1982 the standardese should soon be updated similarly. */
1986 && (same_type_ignoring_top_level_qualifiers_p
1988 {
1991 /* We allow user-defined conversions within init-lists, but
1992 don't list-initialize the copy parm, as that would mean
1993 using two levels of braces for the same type. */
1997 }
1998 else
2004 }
2005 else
2006 {
2010 }
2017 {
2021 }
2024 {
2027 }
2028 }
2030 out:
2033 }
2035 /* Create an overload candidate for the conversion function FN which will
2036 be invoked for expression OBJ, producing a pointer-to-function which
2037 will in turn be called with the argument list FIRST_ARG/ARGLIST,
2038 and add it to CANDIDATES. This does not change ARGLIST. FLAGS is
2039 passed on to implicit_conversion.
2041 Actually, we don't really care about FN; we care about the type it
2042 converts to. There may be multiple conversion functions that will
2043 convert to that type, and we rely on build_user_type_conversion_1 to
2044 choose the best one; so when we create our candidate, we record the type
2045 instead of the function. */
2051 tsubst_flags_t complain)
2052 {
2070 /* Don't bother looking up the same type twice. */
2075 {
2083 else
2088 {
2092 }
2096 {
2100 }
2101 else
2102 {
2106 }
2113 {
2116 }
2123 }
2127 {
2131 }
2135 }
2137 static void
2141 {
2155 /* TRUTH_*_EXPR do "contextual conversion to bool", which means explicit
2156 conversion ops are allowed. We handle that here by just checking for
2157 boolean_type_node because other operators don't ask for it. COND_EXPR
2158 also does contextual conversion to bool for the first operand, but we
2159 handle that in build_conditional_expr, and type1 here is operand 2. */
2164 {
2171 {
2173 /* We need something for printing the candidate. */
2177 }
2179 {
2183 }
2185 }
2187 /* For COND_EXPR we rearranged the arguments; undo that now. */
2189 {
2194 complain);
2197 else
2198 {
2201 boolean_type_node);
2202 }
2203 }
2210 }
2212 static bool
2214 {
2216 }
2218 /* Returns nonzero if TYPE is a promoted arithmetic type. */
2220 static bool
2222 {
2223 /* [over.built]
2225 In this section, the term promoted integral type is used to refer
2226 to those integral types which are preserved by integral promotion
2227 (including e.g. int and long but excluding e.g. char).
2228 Similarly, the term promoted arithmetic type refers to promoted
2229 integral types plus floating types. */
2233 }
2235 /* Create any builtin operator overload candidates for the operator in
2236 question given the converted operand types TYPE1 and TYPE2. The other
2237 args are passed through from add_builtin_candidates to
2238 build_builtin_candidate.
2240 TYPE1 and TYPE2 may not be permissible, and we must filter them.
2241 If CODE is requires candidates operands of the same type of the kind
2242 of which TYPE1 and TYPE2 are, we add both candidates
2243 CODE (TYPE1, TYPE1) and CODE (TYPE2, TYPE2). */
2245 static void
2249 tsubst_flags_t complain)
2250 {
2252 {
2260 }
2263 {
2265 /* 4 For every pair T, VQ), where T is an arithmetic or enumeration type,
2266 and VQ is either volatile or empty, there exist candidate operator
2267 functions of the form
2268 VQ T& operator++(VQ T&);
2269 T operator++(VQ T&, int);
2270 5 For every pair T, VQ), where T is an enumeration type or an arithmetic
2271 type other than bool, and VQ is either volatile or empty, there exist
2272 candidate operator functions of the form
2273 VQ T& operator--(VQ T&);
2274 T operator--(VQ T&, int);
2275 6 For every pair T, VQ), where T is a cv-qualified or cv-unqualified
2276 complete object type, and VQ is either volatile or empty, there exist
2277 candidate operator functions of the form
2278 T*VQ& operator++(T*VQ&);
2279 T*VQ& operator--(T*VQ&);
2280 T* operator++(T*VQ&, int);
2281 T* operator--(T*VQ&, int); */
2290 {
2293 }
2296 /* 7 For every cv-qualified or cv-unqualified object type T, there
2297 exist candidate operator functions of the form
2299 T& operator*(T*);
2301 8 For every function type T, there exist candidate operator functions of
2302 the form
2303 T& operator*(T*); */
2313 /* 9 For every type T, there exist candidate operator functions of the form
2314 T* operator+(T*);
2316 10For every promoted arithmetic type T, there exist candidate operator
2317 functions of the form
2318 T operator+(T);
2319 T operator-(T); */
2329 /* 11For every promoted integral type T, there exist candidate operator
2330 functions of the form
2331 T operator~(T); */
2338 /* 12For every quintuple C1, C2, T, CV1, CV2), where C2 is a class type, C1
2339 is the same type as C2 or is a derived class of C2, T is a complete
2340 object type or a function type, and CV1 and CV2 are cv-qualifier-seqs,
2341 there exist candidate operator functions of the form
2342 CV12 T& operator->*(CV1 C1*, CV2 T C2::*);
2343 where CV12 is the union of CV1 and CV2. */
2347 {
2355 }
2358 /* 13For every pair of promoted arithmetic types L and R, there exist can-
2359 didate operator functions of the form
2360 LR operator*(L, R);
2361 LR operator/(L, R);
2362 LR operator+(L, R);
2363 LR operator-(L, R);
2364 bool operator<(L, R);
2365 bool operator>(L, R);
2366 bool operator<=(L, R);
2367 bool operator>=(L, R);
2368 bool operator==(L, R);
2369 bool operator!=(L, R);
2370 where LR is the result of the usual arithmetic conversions between
2371 types L and R.
2373 14For every pair of types T and I, where T is a cv-qualified or cv-
2374 unqualified complete object type and I is a promoted integral type,
2375 there exist candidate operator functions of the form
2376 T* operator+(T*, I);
2377 T& operator[](T*, I);
2378 T* operator-(T*, I);
2379 T* operator+(I, T*);
2380 T& operator[](I, T*);
2382 15For every T, where T is a pointer to complete object type, there exist
2383 candidate operator functions of the form112)
2384 ptrdiff_t operator-(T, T);
2386 16For every pointer or enumeration type T, there exist candidate operator
2387 functions of the form
2388 bool operator<(T, T);
2389 bool operator>(T, T);
2390 bool operator<=(T, T);
2391 bool operator>=(T, T);
2392 bool operator==(T, T);
2393 bool operator!=(T, T);
2395 17For every pointer to member type T, there exist candidate operator
2396 functions of the form
2397 bool operator==(T, T);
2398 bool operator!=(T, T); */
2405 {
2408 }
2421 {
2424 }
2426 {
2429 }
2430 /* Fall through. */
2447 {
2450 }
2454 {
2457 }
2465 {
2468 }
2470 {
2473 }
2476 /* 18For every pair of promoted integral types L and R, there exist candi-
2477 date operator functions of the form
2478 LR operator%(L, R);
2479 LR operator&(L, R);
2480 LR operator^(L, R);
2481 LR operator|(L, R);
2482 L operator<<(L, R);
2483 L operator>>(L, R);
2484 where LR is the result of the usual arithmetic conversions between
2485 types L and R. */
2493 if (INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (type1) && INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (type2))
2497 /* 19For every triple L, VQ, R), where L is an arithmetic or enumeration
2498 type, VQ is either volatile or empty, and R is a promoted arithmetic
2499 type, there exist candidate operator functions of the form
2500 VQ L& operator=(VQ L&, R);
2501 VQ L& operator*=(VQ L&, R);
2502 VQ L& operator/=(VQ L&, R);
2503 VQ L& operator+=(VQ L&, R);
2504 VQ L& operator-=(VQ L&, R);
2506 20For every pair T, VQ), where T is any type and VQ is either volatile
2507 or empty, there exist candidate operator functions of the form
2508 T*VQ& operator=(T*VQ&, T*);
2510 21For every pair T, VQ), where T is a pointer to member type and VQ is
2511 either volatile or empty, there exist candidate operator functions of
2512 the form
2513 VQ T& operator=(VQ T&, T);
2515 22For every triple T, VQ, I), where T is a cv-qualified or cv-
2516 unqualified complete object type, VQ is either volatile or empty, and
2517 I is a promoted integral type, there exist candidate operator func-
2518 tions of the form
2519 T*VQ& operator+=(T*VQ&, I);
2520 T*VQ& operator-=(T*VQ&, I);
2522 23For every triple L, VQ, R), where L is an integral or enumeration
2523 type, VQ is either volatile or empty, and R is a promoted integral
2524 type, there exist candidate operator functions of the form
2526 VQ L& operator%=(VQ L&, R);
2527 VQ L& operator<<=(VQ L&, R);
2528 VQ L& operator>>=(VQ L&, R);
2529 VQ L& operator&=(VQ L&, R);
2530 VQ L& operator^=(VQ L&, R);
2531 VQ L& operator|=(VQ L&, R); */
2535 {
2539 {
2542 }
2555 if (INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (type1) && INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (type2))
2568 {
2571 }
2576 }
2581 /* [over.built]
2583 For every pair of promoted arithmetic types L and R, there
2584 exist candidate operator functions of the form
2586 LR operator?(bool, L, R);
2588 where LR is the result of the usual arithmetic conversions
2589 between types L and R.
2591 For every type T, where T is a pointer or pointer-to-member
2592 type, there exist candidate operator functions of the form T
2593 operator?(bool, T, T); */
2597 /* That's OK. */
2600 /* Otherwise, the types should be pointers. */
2604 /* We don't check that the two types are the same; the logic
2605 below will actually create two candidates; one in which both
2606 parameter types are TYPE1, and one in which both parameter
2607 types are TYPE2. */
2618 }
2620 /* If we're dealing with two pointer types or two enumeral types,
2621 we need candidates for both of them. */
2630 {
2632 {
2634 error_mark_node,
2635 error_mark_node,
2636 CPO_CONVERSION,
2637 tf_none);
2639 {
2640 build_builtin_candidate
2644 }
2645 }
2647 build_builtin_candidate
2649 build_builtin_candidate
2652 }
2654 build_builtin_candidate
2656 }
2658 tree
2660 {
2666 }
2668 /* There are three conditions of builtin candidates:
2670 1) bool-taking candidates. These are the same regardless of the input.
2671 2) pointer-pair taking candidates. These are generated for each type
2672 one of the input types converts to.
2673 3) arithmetic candidates. According to the standard, we should generate
2674 all of these, but I'm trying not to...
2676 Here we generate a superset of the possible candidates for this particular
2677 case. That is a subset of the full set the standard defines, plus some
2678 other cases which the standard disallows. add_builtin_candidate will
2679 filter out the invalid set. */
2681 static void
2685 {
2689 /* TYPES[i] is the set of possible builtin-operator parameter types
2690 we will consider for the Ith argument. */
2695 {
2698 else
2700 }
2703 {
2704 /* 4 For every pair T, VQ), where T is an arithmetic or enumeration type,
2705 and VQ is either volatile or empty, there exist candidate operator
2706 functions of the form
2707 VQ T& operator++(VQ T&); */
2717 /* 24There also exist candidate operator functions of the form
2718 bool operator!(bool);
2719 bool operator&&(bool, bool);
2720 bool operator||(bool, bool); */
2723 build_builtin_candidate
2730 build_builtin_candidate
2748 /* Fall through. */
2752 }
2758 {
2760 ;
2762 {
2763 tree convs;
2771 {
2776 }
2782 {
2795 {
2801 }
2805 }
2806 }
2807 else
2808 {
2813 {
2819 }
2821 }
2822 }
2824 /* Run through the possible parameter types of both arguments,
2825 creating candidates with those parameter types. */
2827 {
2829 tree u;
2833 add_builtin_candidate
2836 else
2837 add_builtin_candidate
2840 }
2844 }
2847 /* If TMPL can be successfully instantiated as indicated by
2848 EXPLICIT_TARGS and ARGLIST, adds the instantiation to CANDIDATES.
2850 TMPL is the template. EXPLICIT_TARGS are any explicit template
2851 arguments. ARGLIST is the arguments provided at the call-site.
2852 This does not change ARGLIST. The RETURN_TYPE is the desired type
2853 for conversion operators. If OBJ is NULL_TREE, FLAGS and CTYPE are
2854 as for add_function_candidate. If an OBJ is supplied, FLAGS and
2855 CTYPE are ignored, and OBJ is as for add_conv_candidate. */
2863 tsubst_flags_t complain)
2864 {
2874 tree arg;
2876 tree fn;
2880 /* We don't do deduction on the in-charge parameter, the VTT
2881 parameter or 'this'. */
2883 {
2886 else
2888 }
2893 {
2896 else
2898 }
2908 {
2911 }
2915 {
2918 }
2923 args_without_in_chrg,
2924 nargs_without_in_chrg,
2929 {
2930 /* Don't repeat unification later if it already resulted in errors. */
2934 nargs_without_in_chrg,
2936 else
2939 }
2941 /* In [class.copy]:
2943 A member function template is never instantiated to perform the
2944 copy of a class object to an object of its class type.
2946 It's a little unclear what this means; the standard explicitly
2947 does allow a template to be used to copy a class. For example,
2948 in:
2950 struct A {
2951 A(A&);
2952 template <class T> A(const T&);
2953 };
2954 const A f ();
2955 void g () { A a (f ()); }
2957 the member template will be used to make the copy. The section
2958 quoted above appears in the paragraph that forbids constructors
2959 whose only parameter is (a possibly cv-qualified variant of) the
2960 class type, and a logical interpretation is that the intent was
2961 to forbid the instantiation of member templates which would then
2962 have that form. */
2964 {
2967 ctype))
2968 {
2971 }
2972 }
2975 /* Aha, this is a conversion function. */
2978 else
2983 /* This situation can occur if a member template of a template
2984 class is specialized. Then, instantiate_template might return
2985 an instantiation of the specialization, in which case the
2986 DECL_TI_TEMPLATE field will point at the original
2987 specialization. For example:
2989 template <class T> struct S { template <class U> void f(U);
2990 template <> void f(int) {}; };
2991 S<double> sd;
2992 sd.f(3);
2994 Here, TMPL will be template <class U> S<double>::f(U).
2995 And, instantiate template will give us the specialization
2996 template <> S<double>::f(int). But, the DECL_TI_TEMPLATE field
2997 for this will point at template <class T> template <> S<T>::f(int),
2998 so that we can find the definition. For the purposes of
2999 overload resolution, however, we want the original TMPL. */
3001 else
3006 fail:
3009 }
3018 {
3019 return
3024 }
3033 {
3034 return
3038 complain);
3039 }
3041 /* The CANDS are the set of candidates that were considered for
3042 overload resolution. Return the set of viable candidates, or CANDS
3043 if none are viable. If any of the candidates were viable, set
3044 *ANY_VIABLE_P to true. STRICT_P is true if a candidate should be
3045 considered viable only if it is strictly viable. */
3051 {
3056 /* Be strict inside templates, since build_over_call won't actually
3057 do the conversions to get pedwarns. */
3067 {
3070 {
3076 }
3077 else
3079 }
3082 }
3084 static bool
3086 {
3091 }
3093 /* OBJ is being used in an expression like "OBJ.f (...)". In other
3094 words, it is about to become the "this" pointer for a member
3095 function call. Take the address of the object. */
3097 static tree
3099 {
3100 /* In a template, we are only concerned about the type of the
3101 expression, so we can take a shortcut. */
3106 }
3108 /* Returns true iff functions are equivalent. Equivalent functions are
3109 not '==' only if one is a function-local extern function or if
3110 both are extern "C". */
3114 {
3123 }
3125 /* Print information about a candidate being rejected due to INFO. */
3127 static void
3129 {
3131 /* Conversion of implicit `this' argument failed. */
3135 else
3138 }
3140 /* Print information about a candidate with WANT parameters and we found
3141 HAVE. */
3143 static void
3145 {
3150 }
3152 /* Print information about one overload candidate CANDIDATE. MSGSTR
3153 is the text to print before the candidate itself.
3155 NOTE: Unlike most diagnostic functions in GCC, MSGSTR is expected
3156 to have been run through gettext by the caller. This wart makes
3157 life simpler in print_z_candidates and for the translators. */
3159 static void
3162 {
3169 {
3180 else
3183 }
3190 else
3192 /* Give the user some information about why this candidate failed. */
3194 {
3198 {
3211 "cannot be converted to %qT with a qualification "
3217 "conversion function specialization to %qT is not an "
3222 /* We use template_unification_error_rejection if unification caused
3223 actual non-SFINAE errors, in which case we don't need to repeat
3224 them here. */
3226 {
3230 }
3231 /* Re-run template unification with diagnostics. */
3235 (make_tree_vec
3246 " a constructor taking a single argument of its own "
3251 /* This candidate didn't have any issues or we failed to
3252 handle a particular code. Either way... */
3254 }
3255 }
3256 }
3258 static void
3260 {
3268 /* Remove non-viable deleted candidates. */
3271 {
3276 else
3278 }
3279 /* ...if there are any non-deleted ones. */
3283 /* There may be duplicates in the set of candidates. We put off
3284 checking this condition as long as possible, since we have no way
3285 to eliminate duplicates from a set of functions in less than n^2
3286 time. Now we are about to emit an error message, so it is more
3287 permissible to go slowly. */
3289 {
3291 /* Skip builtin candidates and conversion functions. */
3296 {
3300 else
3302 }
3303 }
3306 n_candidates++;
3311 }
3313 /* USER_SEQ is a user-defined conversion sequence, beginning with a
3314 USER_CONV. STD_SEQ is the standard conversion sequence applied to
3315 the result of the conversion function to convert it to the final
3316 desired type. Merge the two sequences into a single sequence,
3317 and return the merged sequence. */
3321 {
3327 /* Find the end of the second conversion sequence. */
3329 {
3330 /* The entire sequence is a user-conversion sequence. */
3334 }
3336 /* Replace the identity conversion with the user conversion
3337 sequence. */
3341 }
3343 /* Handle overload resolution for initializing an object of class type from
3344 an initializer list. First we look for a suitable constructor that
3345 takes a std::initializer_list; if we don't find one, we then look for a
3346 non-list constructor.
3348 Parameters are as for add_candidates, except that the arguments are in
3349 the form of a CONSTRUCTOR (the initializer list) rather than a vector, and
3350 the RETURN_TYPE parameter is replaced by TOTYPE, the desired type. */
3352 static void
3359 tsubst_flags_t complain)
3360 {
3365 /* We're looking for a ctor for list-initialization. */
3367 /* And we don't allow narrowing conversions. We also use this flag to
3368 avoid the copy constructor call for copy-list-initialization. */
3371 /* Always use the default constructor if the list is empty (DR 990). */
3374 ;
3375 /* If the class has a list ctor, try passing the list as a single
3376 argument first, but only consider list ctors. */
3378 {
3386 }
3390 /* We aren't looking for list-ctors anymore. */
3392 /* We allow more user-defined conversions within an init-list. */
3398 }
3400 /* Returns the best overload candidate to perform the requested
3401 conversion. This function is used for three the overloading situations
3402 described in [over.match.copy], [over.match.conv], and [over.match.ref].
3403 If TOTYPE is a REFERENCE_TYPE, we're trying to find a direct binding as
3404 per [dcl.init.ref], so we ignore temporary bindings. */
3408 tsubst_flags_t complain)
3409 {
3411 tree fromtype;
3425 /* We represent conversion within a hierarchy using RVALUE_CONV and
3426 BASE_CONV, as specified by [over.best.ics]; these become plain
3427 constructor calls, as specified in [dcl.init]. */
3432 /* Use lookup_fnfields_slot instead of lookup_fnfields to avoid
3433 creating a garbage BASELINK; constructors can't be inherited. */
3437 {
3442 {
3443 /* [class.conv.fct] A conversion function is never used to
3444 convert a (possibly cv-qualified) object to the (possibly
3445 cv-qualified) same object type (or a reference to it), to a
3446 (possibly cv-qualified) base class of that type (or a
3447 reference to it)... */
3448 }
3449 else
3451 }
3458 /* It's OK to bind a temporary for converting constructor arguments, but
3459 not in converting the return value of a conversion operator. */
3464 {
3470 /* We should never try to call the abstract or base constructor
3471 from here. */
3476 {
3477 /* List-initialization. */
3481 }
3482 else
3483 {
3488 }
3491 {
3494 /* If totype isn't a reference, and LOOKUP_NO_TEMP_BIND isn't
3495 set, then this is copy-initialization. In that case, "The
3496 result of the call is then used to direct-initialize the
3497 object that is the destination of the copy-initialization."
3498 [dcl.init]
3500 We represent this in the conversion sequence with an
3501 rvalue conversion, which means a constructor call. */
3504 cand->second_conv
3506 }
3507 }
3513 {
3517 /* If we are called to convert to a reference type, we are trying to
3518 find a direct binding, so don't even consider temporaries. If
3519 we don't find a direct binding, the caller will try again to
3520 look for a temporary binding. */
3531 {
3533 conversion *ics
3535 rettype,
3538 complain);
3540 /* If LOOKUP_NO_TEMP_BIND isn't set, then this is
3541 copy-initialization. In that case, "The result of the
3542 call is then used to direct-initialize the object that is
3543 the destination of the copy-initialization." [dcl.init]
3545 We represent this in the conversion sequence with an
3546 rvalue conversion, which means a constructor call. But
3547 don't add a second rvalue conversion if there's already
3548 one there. Which there really shouldn't be, but it's
3549 harmless since we'd add it here anyway. */
3557 {
3561 }
3564 {
3565 /* 13.3.1.5: For direct-initialization, those explicit
3566 conversion functions that are not hidden within S and
3567 yield type T or a type that can be converted to type T
3568 with a qualification conversion (4.4) are also candidate
3569 functions. */
3570 /* 13.3.1.6 doesn't have a parallel restriction, but it should;
3571 I've raised this issue with the committee. --jason 9/2011 */
3574 }
3576 {
3578 cand->reason
3581 }
3584 {
3585 /* 13.3.3.1.2: If the user-defined conversion is specified by
3586 a specialization of a conversion function template, the
3587 second standard conversion sequence shall have exact match
3588 rank. */
3591 }
3592 }
3593 }
3597 {
3601 }
3605 {
3607 {
3611 }
3618 /* If there are viable candidates, don't set ICS_BAD_FLAG; an
3619 ambiguous conversion is no worse than another user-defined
3620 conversion. */
3623 }
3625 /* Build the user conversion sequence. */
3626 conv = build_conv
3635 /* Remember that this was a list-initialization. */
3639 /* Combine it with the second conversion sequence. */
3644 }
3646 /* Wrapper for above. */
3648 tree
3650 tsubst_flags_t complain)
3651 {
3653 tree ret;
3659 {
3662 else
3663 {
3666 }
3667 }
3668 else
3673 }
3675 /* Subroutine of convert_nontype_argument.
3677 EXPR is an argument for a template non-type parameter of integral or
3678 enumeration type. Do any necessary conversions (that are permitted for
3679 non-type arguments) to convert it to the parameter type.
3681 If conversion is successful, returns the converted expression;
3682 otherwise, returns error_mark_node. */
3684 tree
3686 {
3689 tree t;
3697 /* Get the high-water mark for the CONVERSION_OBSTACK. */
3704 /* for a non-type template-parameter of integral or
3705 enumeration type, integral promotions (4.5) and integral
3706 conversions (4.7) are applied. */
3707 /* It should be sufficient to check the outermost conversion step, since
3708 there are no qualification conversions to integer type. */
3711 {
3712 /* A conversion function is OK. If it isn't constexpr, we'll
3713 complain later that the argument isn't constant. */
3715 /* The lvalue-to-rvalue conversion is OK. */
3728 /* and fall through. */
3733 }
3737 else
3740 /* Free all the conversions we allocated. */
3744 }
3746 /* Do any initial processing on the arguments to a function call. */
3750 {
3752 tree arg;
3755 {
3759 {
3763 }
3766 }
3768 }
3770 /* Perform overload resolution on FN, which is called with the ARGS.
3772 Return the candidate function selected by overload resolution, or
3773 NULL if the event that overload resolution failed. In the case
3774 that overload resolution fails, *CANDIDATES will be the set of
3775 candidates considered, and ANY_VIABLE_P will be set to true or
3776 false to indicate whether or not any of the candidates were
3777 viable.
3779 The ARGS should already have gone through RESOLVE_ARGS before this
3780 function is called. */
3787 {
3789 tree explicit_targs;
3800 /* Check FN. */
3807 {
3811 }
3813 /* Add the various candidate functions. */
3818 LOOKUP_NORMAL,
3824 else
3829 }
3831 /* Print an error message about being unable to build a call to FN with
3832 ARGS. ANY_VIABLE_P indicates whether any candidate functions could
3833 be located; CANDIDATES is a possibly empty list of such
3834 functions. */
3836 static void
3839 {
3846 else
3851 }
3853 /* Return an expression for a call to FN (a namespace-scope function,
3854 or a static member function) with the ARGS. This may change
3855 ARGS. */
3857 tree
3859 tsubst_flags_t complain)
3860 {
3864 tree result;
3867 {
3871 }
3876 /* If this function was found without using argument dependent
3877 lookup, then we want to ignore any undeclared friend
3878 functions. */
3880 {
3885 {
3889 }
3890 }
3892 /* Get the high-water mark for the CONVERSION_OBSTACK. */
3896 complain);
3899 {
3901 {
3908 }
3910 }
3911 else
3912 {
3914 /* If fn is template_id_expr, the call has explicit template arguments
3915 (e.g. func<int>(5)), communicate this info to build_over_call
3916 through flags so that later we can use it to decide whether to warn
3917 about peculiar null pointer conversion. */
3921 }
3923 /* Free all the conversions we allocated. */
3927 }
3929 /* Build a call to a global operator new. FNNAME is the name of the
3930 operator (either "operator new" or "operator new[]") and ARGS are
3931 the arguments provided. This may change ARGS. *SIZE points to the
3932 total number of bytes required by the allocation, and is updated if
3933 that is changed here. *COOKIE_SIZE is non-NULL if a cookie should
3934 be used. If this function determines that no cookie should be
3935 used, after all, *COOKIE_SIZE is set to NULL_TREE. If SIZE_CHECK
3936 is not NULL_TREE, it is evaluated before calculating the final
3937 array size, and if it fails, the array size is replaced with
3938 (size_t)-1 (usually triggering a std::bad_alloc exception). If FN
3939 is non-NULL, it will be set, upon return, to the allocation
3940 function called. */
3942 tree
3946 {
3948 tree fns;
3955 /* Set to (size_t)-1 if the size check fails. */
3957 {
3963 }
3969 /* Based on:
3971 [expr.new]
3973 If this lookup fails to find the name, or if the allocated type
3974 is not a class type, the allocation function's name is looked
3975 up in the global scope.
3977 we disregard block-scope declarations of "operator new". */
3980 /* Figure out what function is being called. */
3982 complain);
3984 /* If no suitable function could be found, issue an error message
3985 and give up. */
3987 {
3991 }
3993 /* If a cookie is required, add some extra space. Whether
3994 or not a cookie is required cannot be determined until
3995 after we know which function was called. */
3997 {
4000 {
4001 /* In G++ 3.2, the check was implemented incorrectly; it
4002 looked at the placement expression, rather than the
4003 type of the function. */
4007 }
4008 else
4009 {
4010 tree arg_types;
4013 /* Skip the size_t parameter. */
4015 /* Check the remaining parameters (if any). */
4019 ptr_type_node))
4021 }
4022 /* If we need a cookie, adjust the number of bytes allocated. */
4024 {
4025 /* Update the total size. */
4027 /* Set to (size_t)-1 if the size check fails. */
4031 /* Update the argument list to reflect the adjusted size. */
4033 }
4034 else
4036 }
4038 /* Tell our caller which function we decided to call. */
4042 /* Build the CALL_EXPR. */
4044 }
4046 /* Build a new call to operator(). This may change ARGS. */
4048 static tree
4050 {
4064 {
4066 /* It's no good looking for an overloaded operator() on a
4067 pointer-to-member-function. */
4068 error ("pointer-to-member function %E cannot be called without an object; consider using .* or ->*", obj);
4070 }
4073 {
4077 }
4078 else
4082 {
4086 }
4088 /* Get the high-water mark for the CONVERSION_OBSTACK. */
4092 {
4100 }
4105 {
4114 {
4121 add_template_conv_candidate
4125 else
4129 }
4130 }
4134 {
4136 {
4140 }
4142 }
4143 else
4144 {
4147 {
4149 {
4153 }
4155 }
4156 /* Since cand->fn will be a type, not a function, for a conversion
4157 function, we must be careful not to unconditionally look at
4158 DECL_NAME here. */
4162 else
4163 {
4165 complain);
4168 }
4169 }
4171 /* Free all the conversions we allocated. */
4175 }
4177 /* Wrapper for above. */
4179 tree
4181 {
4182 tree ret;
4187 }
4189 /* Called by op_error to prepare format strings suitable for the error
4190 function. It concatenates a prefix (controlled by MATCH), ERRMSG,
4191 and a suffix (controlled by NTYPES). */
4195 {
4205 else
4209 }
4211 static void
4214 {
4219 else
4223 {
4229 else
4241 else
4251 else
4262 else
4272 else
4277 else
4281 else
4286 }
4287 }
4289 /* Return the implicit conversion sequence that could be used to
4290 convert E1 to E2 in [expr.cond]. */
4294 {
4300 /* [expr.cond]
4302 If E2 is an lvalue: E1 can be converted to match E2 if E1 can be
4303 implicitly converted (clause _conv_) to the type "lvalue reference to
4304 T2", subject to the constraint that in the conversion the
4305 reference must bind directly (_dcl.init.ref_) to an lvalue. */
4307 {
4309 t1,
4310 e1,
4312 LOOKUP_NO_TEMP_BIND|LOOKUP_NO_RVAL_BIND
4314 complain);
4317 }
4319 /* [expr.cond]
4321 If E1 and E2 have class type, and the underlying class types are
4322 the same or one is a base class of the other: E1 can be converted
4323 to match E2 if the class of T2 is the same type as, or a base
4324 class of, the class of T1, and the cv-qualification of T2 is the
4325 same cv-qualification as, or a greater cv-qualification than, the
4326 cv-qualification of T1. If the conversion is applied, E1 is
4327 changed to an rvalue of type T2 that still refers to the original
4328 source class object (or the appropriate subobject thereof). */
4331 {
4333 {
4338 else
4341 }
4342 else
4344 }
4345 else
4346 /* [expr.cond]
4348 Otherwise: E1 can be converted to match E2 if E1 can be implicitly
4349 converted to the type that expression E2 would have if E2 were
4350 converted to an rvalue (or the type it has, if E2 is an rvalue). */
4353 }
4355 /* Implement [expr.cond]. ARG1, ARG2, and ARG3 are the three
4356 arguments to the conditional expression. */
4358 static tree
4360 tsubst_flags_t complain)
4361 {
4362 tree arg2_type;
4363 tree arg3_type;
4372 /* As a G++ extension, the second argument to the conditional can be
4373 omitted. (So that `a ? : c' is roughly equivalent to `a ? a :
4374 c'.) If the second operand is omitted, make sure it is
4375 calculated only once. */
4377 {
4382 /* Make sure that lvalues remain lvalues. See g++.oliva/ext1.C. */
4385 else
4387 }
4389 /* If something has already gone wrong, just pass that fact up the
4390 tree. */
4400 {
4405 /* force_rvalue can return error_mark on valid arguments. */
4417 {
4418 /* Rely on the error messages of the scalar version. */
4427 {
4435 }
4439 /* We could pass complain & tf_warning to unsafe_conversion_p,
4440 but the warnings (like Wsign-conversion) have already been
4441 given by the scalar build_conditional_expr_1. We still check
4442 unsafe_conversion_p to forbid truncating long long -> float. */
4444 {
4449 }
4451 {
4456 }
4466 }
4470 {
4476 {
4480 {
4486 }
4488 {
4494 }
4497 }
4498 }
4504 {
4507 "incompatible vector types in conditional expression: "
4511 }
4517 }
4519 /* [expr.cond]
4521 The first expression is implicitly converted to bool (clause
4522 _conv_). */
4524 LOOKUP_NORMAL);
4528 /* [expr.cond]
4530 If either the second or the third operand has type (possibly
4531 cv-qualified) void, then the lvalue-to-rvalue (_conv.lval_),
4532 array-to-pointer (_conv.array_), and function-to-pointer
4533 (_conv.func_) standard conversions are performed on the second
4534 and third operands. */
4538 {
4539 /* Do the conversions. We don't these for `void' type arguments
4540 since it can't have any effect and since decay_conversion
4541 does not handle that case gracefully. */
4549 /* [expr.cond]
4551 One of the following shall hold:
4553 --The second or the third operand (but not both) is a
4554 throw-expression (_except.throw_); the result is of the
4555 type of the other and is an rvalue.
4557 --Both the second and the third operands have type void; the
4558 result is of type void and is an rvalue.
4560 We must avoid calling force_rvalue for expressions of type
4561 "void" because it will complain that their value is being
4562 used. */
4565 {
4567 {
4571 }
4574 }
4577 {
4579 {
4583 }
4586 }
4589 else
4590 {
4592 {
4595 "second operand to the conditional operator "
4596 "is of type %<void%>, but the third operand is "
4598 else
4600 "third operand to the conditional operator "
4601 "is of type %<void%>, but the second operand is "
4603 }
4605 }
4609 }
4610 /* [expr.cond]
4612 Otherwise, if the second and third operand have different types,
4613 and either has (possibly cv-qualified) class type, an attempt is
4614 made to convert each of those operands to the type of the other. */
4617 {
4621 /* Get the high-water mark for the CONVERSION_OBSTACK. */
4627 /* [expr.cond]
4629 If both can be converted, or one can be converted but the
4630 conversion is ambiguous, the program is ill-formed. If
4631 neither can be converted, the operands are left unchanged and
4632 further checking is performed as described below. If exactly
4633 one conversion is possible, that conversion is applied to the
4634 chosen operand and the converted operand is used in place of
4635 the original operand for the remainder of this section. */
4640 {
4645 }
4647 {
4651 /* Even if CONV2 is a valid conversion, the result of the
4652 conversion may be invalid. For example, if ARG3 has type
4653 "volatile X", and X does not have a copy constructor
4654 accepting a "volatile X&", then even if ARG2 can be
4655 converted to X, the conversion will fail. */
4658 }
4660 {
4666 }
4668 /* Free all the conversions we allocated. */
4674 /* If, after the conversion, both operands have class type,
4675 treat the cv-qualification of both operands as if it were the
4676 union of the cv-qualification of the operands.
4678 The standard is not clear about what to do in this
4679 circumstance. For example, if the first operand has type
4680 "const X" and the second operand has a user-defined
4681 conversion to "volatile X", what is the type of the second
4682 operand after this step? Making it be "const X" (matching
4683 the first operand) seems wrong, as that discards the
4684 qualification without actually performing a copy. Leaving it
4685 as "volatile X" seems wrong as that will result in the
4686 conditional expression failing altogether, even though,
4687 according to this step, the one operand could be converted to
4688 the type of the other. */
4696 }
4698 /* [expr.cond]
4700 If the second and third operands are glvalues of the same value
4701 category and have the same type, the result is of that type and
4702 value category. */
4706 {
4711 }
4713 /* [expr.cond]
4715 Otherwise, the result is an rvalue. If the second and third
4716 operand do not have the same type, and either has (possibly
4717 cv-qualified) class type, overload resolution is used to
4718 determine the conversions (if any) to be applied to the operands
4719 (_over.match.oper_, _over.built_). */
4723 {
4728 /* Rearrange the arguments so that add_builtin_candidate only has
4729 to know about two args. In build_builtin_candidate, the
4730 arguments are unscrambled. */
4735 COND_EXPR,
4736 NOP_EXPR,
4738 args,
4741 /* [expr.cond]
4743 If the overload resolution fails, the program is
4744 ill-formed. */
4747 {
4749 {
4752 }
4754 }
4757 {
4759 {
4762 }
4764 }
4766 /* [expr.cond]
4768 Otherwise, the conversions thus determined are applied, and
4769 the converted operands are used in place of the original
4770 operands for the remainder of this section. */
4779 }
4781 /* [expr.cond]
4783 Lvalue-to-rvalue (_conv.lval_), array-to-pointer (_conv.array_),
4784 and function-to-pointer (_conv.func_) standard conversions are
4785 performed on the second and third operands.
4787 We need to force the lvalue-to-rvalue conversion here for class types,
4788 so we get TARGET_EXPRs; trying to deal with a COND_EXPR of class rvalues
4789 that isn't wrapped with a TARGET_EXPR plays havoc with exception
4790 regions. */
4803 /* [expr.cond]
4805 After those conversions, one of the following shall hold:
4807 --The second and third operands have the same type; the result is of
4808 that type. */
4811 /* [expr.cond]
4813 --The second and third operands have arithmetic or enumeration
4814 type; the usual arithmetic conversions are performed to bring
4815 them to a common type, and the result is of that type. */
4820 {
4821 /* In this case, there is always a common type. */
4823 arg3_type);
4826 "implicit conversion from %qT to %qT to "
4828 loc);
4832 {
4836 /* Two enumerators from the same enumeration can have different
4842 }
4849 {
4853 }
4857 }
4858 /* [expr.cond]
4860 --The second and third operands have pointer type, or one has
4861 pointer type and the other is a null pointer constant; pointer
4862 conversions (_conv.ptr_) and qualification conversions
4863 (_conv.qual_) are performed to bring them to their composite
4864 pointer type (_expr.rel_). The result is of the composite
4865 pointer type.
4867 --The second and third operands have pointer to member type, or
4868 one has pointer to member type and the other is a null pointer
4869 constant; pointer to member conversions (_conv.mem_) and
4870 qualification conversions (_conv.qual_) are performed to bring
4871 them to a common type, whose cv-qualification shall match the
4872 cv-qualification of either the second or the third operand.
4873 The result is of the common type. */
4881 {
4884 complain);
4889 }
4892 {
4897 }
4902 valid_operands:
4905 /* Avoid folding within decltype (c++/42013) and noexcept. */
4908 /* We can't use result_type below, as fold might have returned a
4909 throw_expr. */
4912 {
4913 /* Expand both sides into the same slot, hopefully the target of
4914 the ?: expression. We used to check for TARGET_EXPRs here,
4915 but now we sometimes wrap them in NOP_EXPRs so the test would
4916 fail. */
4919 /* If this expression is an rvalue, but might be mistaken for an
4920 lvalue, we must add a NON_LVALUE_EXPR. */
4922 }
4923 else
4927 }
4929 /* Wrapper for above. */
4931 tree
4933 tsubst_flags_t complain)
4934 {
4935 tree ret;
4940 }
4942 /* OPERAND is an operand to an expression. Perform necessary steps
4943 required before using it. If OPERAND is NULL_TREE, NULL_TREE is
4944 returned. */
4946 static tree
4948 {
4950 {
4953 /* Make sure the template type is instantiated now. */
4955 }
4958 }
4960 /* Add each of the viable functions in FNS (a FUNCTION_DECL or
4961 OVERLOAD) to the CANDIDATES, returning an updated list of
4962 CANDIDATES. The ARGS are the arguments provided to the call;
4963 if FIRST_ARG is non-null it is the implicit object argument,
4964 otherwise the first element of ARGS is used if needed. The
4965 EXPLICIT_TARGS are explicit template arguments provided.
4966 TEMPLATE_ONLY is true if only template functions should be
4967 considered. CONVERSION_PATH, ACCESS_PATH, and FLAGS are as for
4968 add_function_candidate. */
4970 static void
4972 tree return_type,
4977 tsubst_flags_t complain)
4978 {
4979 tree ctype;
4983 unification_kind_t strict;
4984 tree fn;
4989 /* Precalculate special handling of constructors and conversion ops. */
4992 {
4996 /* We're doing return_type(x). */
4998 else
4999 /* We're doing x.operator return_type(). */
5001 /* [over.match.funcs] For conversion functions, the function
5002 is considered to be a member of the class of the implicit
5003 object argument for the purpose of defining the type of
5004 the implicit object parameter. */
5006 }
5007 else
5008 {
5010 {
5012 /* For list-initialization we consider explicit constructors
5013 and complain if one is chosen. */
5014 check_converting
5017 }
5018 else
5019 {
5022 }
5025 }
5029 else
5030 /* Delay creating the implicit this parameter until it is needed. */
5034 {
5035 tree fn_first_arg;
5045 /* Figure out which set of arguments to use. */
5047 {
5048 /* If this function is a non-static member and we didn't get an
5049 implicit object argument, move it out of args. */
5051 {
5053 tree arg;
5060 }
5064 }
5065 else
5066 {
5067 /* Otherwise, just use the list of arguments provided. */
5070 }
5074 fn,
5075 ctype,
5076 explicit_targs,
5077 fn_first_arg,
5078 fn_args,
5079 return_type,
5080 access_path,
5081 conversion_path,
5082 flags,
5083 strict,
5084 complain);
5087 fn,
5088 ctype,
5089 fn_first_arg,
5090 fn_args,
5091 access_path,
5092 conversion_path,
5093 flags,
5094 complain);
5095 }
5096 }
5098 static tree
5101 {
5104 tree fnname;
5122 {
5126 }
5127 else
5133 {
5138 /* Use build_op_new_call and build_op_delete_call instead. */
5142 /* Use build_op_call instead. */
5149 /* These are saved for the sake of warn_logical_operator. */
5155 }
5161 /* Use build_conditional_expr instead. */
5177 /* Get the high-water mark for the CONVERSION_OBSTACK. */
5180 /* Add namespace-scope operators to the list of functions to
5181 consider. */
5191 /* Add class-member operators to the candidate set. */
5193 {
5194 tree fns;
5198 {
5201 }
5209 }
5210 /* Per 13.3.1.2/3, 2nd bullet, if no operand has a class type, then
5211 only non-member functions that have type T1 or reference to
5212 cv-qualified-opt T1 for the first argument, if the first argument
5213 has an enumeration type, or T2 or reference to cv-qualified-opt
5214 T2 for the second argument, if the the second argument has an
5215 enumeration type. Filter out those that don't match. */
5217 {
5221 {
5231 {
5237 && (same_type_ignoring_top_level_qualifiers_p
5242 }
5244 /* No argument has an appropriate type, so remove this
5245 candidate function from the list. */
5247 {
5250 }
5251 }
5252 }
5258 {
5261 /* For these, the built-in candidates set is empty
5262 [over.match.oper]/3. We don't want non-strict matches
5263 because exact matches are always possible with built-in
5264 operators. The built-in candidate set for COMPONENT_REF
5265 would be empty too, but since there are no such built-in
5266 operators, we accept non-strict matches for them. */
5273 }
5277 {
5279 {
5282 /* Don't try anything fancy if we're not allowed to produce
5283 errors. */
5287 /* Look for an `operator++ (int)'. Pre-1985 C++ didn't
5288 distinguish between prefix and postfix ++ and
5289 operator++() was used for both, so we allow this with
5290 -fpermissive. */
5291 else
5292 {
5298 }
5305 else
5311 /* The caller will deal with these. */
5321 {
5322 /* If one of the arguments of the operator represents
5323 an invalid use of member function pointer, try to report
5324 a meaningful error ... */
5329 else
5330 {
5331 /* ... Otherwise, report the more generic
5332 "no matching operator found" error */
5335 }
5336 }
5339 }
5340 }
5341 else
5342 {
5345 {
5347 {
5350 }
5352 }
5354 {
5360 else
5362 }
5363 else
5364 {
5365 /* Give any warnings we noticed during overload resolution. */
5367 {
5371 }
5373 /* Check for comparison of different enum types. */
5375 {
5387 {
5391 }
5395 }
5397 /* We need to strip any leading REF_BIND so that bitfields
5398 don't cause errors. This should not remove any important
5399 conversions, because builtins don't apply to class
5400 objects directly. */
5407 {
5411 else
5414 /* We need to call warn_logical_operator before
5415 converting arg2 to a boolean_type, but after
5416 decaying an enumerator to its value. */
5423 }
5425 {
5430 }
5432 }
5433 }
5435 user_defined_result_ready:
5437 /* Free all the conversions we allocated. */
5443 builtin:
5445 {
5458 /* Fall through. */
5497 complain),
5500 /* The caller will deal with these. */
5508 }
5510 }
5512 /* Wrapper for above. */
5514 tree
5518 {
5519 tree ret;
5525 }
5527 /* Returns true iff T, an element of an OVERLOAD chain, is a usual
5528 deallocation function (3.7.4.2 [basic.stc.dynamic.deallocation]). */
5530 static bool
5532 {
5533 /* A template instance is never a usual deallocation function,
5534 regardless of its signature. */
5539 /* If a class T has a member deallocation function named operator delete
5540 with exactly one parameter, then that function is a usual
5541 (non-placement) deallocation function. If class T does not declare
5542 such an operator delete but does declare a member deallocation
5543 function named operator delete with exactly two parameters, the second
5544 of which has type std::size_t (18.2), then this function is a usual
5545 deallocation function. */
5552 }
5554 /* Build a call to operator delete. This has to be handled very specially,
5555 because the restrictions on what signatures match are different from all
5556 other call instances. For a normal delete, only a delete taking (void *)
5557 or (void *, size_t) is accepted. For a placement delete, only an exact
5558 match with the placement new is accepted.
5560 CODE is either DELETE_EXPR or VEC_DELETE_EXPR.
5561 ADDR is the pointer to be deleted.
5562 SIZE is the size of the memory block to be deleted.
5563 GLOBAL_P is true if the delete-expression should not consider
5564 class-specific delete operators.
5565 PLACEMENT is the corresponding placement new call, or NULL_TREE.
5567 If this call to "operator delete" is being generated as part to
5568 deallocate memory allocated via a new-expression (as per [expr.new]
5569 which requires that if the initialization throws an exception then
5570 we call a deallocation function), then ALLOC_FN is the allocation
5571 function. */
5573 tree
5577 {
5591 /* In [class.free]
5593 If the result of the lookup is ambiguous or inaccessible, or if
5594 the lookup selects a placement deallocation function, the
5595 program is ill-formed.
5597 Therefore, we ask lookup_fnfields to complain about ambiguity. */
5598 {
5602 }
5603 else
5609 /* Strip const and volatile from addr. */
5613 {
5614 /* "A declaration of a placement deallocation function matches the
5615 declaration of a placement allocation function if it has the same
5616 number of parameters and, after parameter transformations (8.3.5),
5617 all parameter types except the first are identical."
5619 So we build up the function type we want and ask instantiate_type
5620 to get it for us. */
5632 /* "If the lookup finds the two-parameter form of a usual deallocation
5633 function (3.7.4.2) and that function, considered as a placement
5634 deallocation function, would have been selected as a match for the
5635 allocation function, the program is ill-formed." */
5637 {
5638 /* But if the class has an operator delete (void *), then that is
5639 the usual deallocation function, so we shouldn't complain
5640 about using the operator delete (void *, size_t). */
5643 {
5648 }
5650 {
5653 }
5654 else
5656 ok:;
5657 }
5658 }
5659 else
5660 /* "Any non-placement deallocation function matches a non-placement
5661 allocation function. If the lookup finds a single matching
5662 deallocation function, that function will be called; otherwise, no
5663 deallocation function will be called." */
5666 {
5669 {
5671 /* "If a class T has a member deallocation function named
5672 operator delete with exactly one parameter, then that
5673 function is a usual (non-placement) deallocation
5674 function. If class T does not declare such an operator
5675 delete but does declare a member deallocation function named
5676 operator delete with exactly two parameters, the second of
5677 which has type std::size_t (18.2), then this function is a
5678 usual deallocation function."
5680 So (void*) beats (void*, size_t). */
5683 }
5684 }
5686 /* If we have a matching function, call it. */
5688 {
5691 /* If the FN is a member function, make sure that it is
5692 accessible. */
5695 complain);
5697 /* Core issue 901: It's ok to new a type with deleted delete. */
5702 {
5703 /* The placement args might not be suitable for overload
5704 resolution at this point, so build the call directly. */
5713 }
5714 else
5715 {
5716 tree ret;
5724 }
5725 }
5727 /* [expr.new]
5729 If no unambiguous matching deallocation function can be found,
5730 propagating the exception does not cause the object's memory to
5731 be freed. */
5733 {
5737 alloc_fn);
5739 }
5745 }
5747 /* If the current scope isn't allowed to access DECL along
5748 BASETYPE_PATH, give an error. The most derived class in
5749 BASETYPE_PATH is the one used to qualify DECL. DIAG_DECL is
5750 the declaration to use in the error diagnostic. */
5752 bool
5754 tsubst_flags_t complain)
5755 {
5759 {
5761 {
5766 else
5769 }
5771 }
5774 }
5776 /* Initialize a temporary of type TYPE with EXPR. The FLAGS are a
5777 bitwise or of LOOKUP_* values. If any errors are warnings are
5778 generated, set *DIAGNOSTIC_FN to "error" or "warning",
5779 respectively. If no diagnostics are generated, set *DIAGNOSTIC_FN
5780 to NULL. */
5782 static tree
5785 {
5798 else
5801 }
5803 /* Perform warnings about peculiar, but valid, conversions from/to NULL.
5804 EXPR is implicitly converted to type TOTYPE.
5805 FN and ARGNUM are used for diagnostics. */
5807 static void
5809 {
5810 /* Issue warnings about peculiar, but valid, uses of NULL. */
5813 {
5814 source_location loc =
5821 else
5824 }
5826 /* Issue warnings if "false" is converted to a NULL pointer */
5829 {
5832 "converting %<false%> to pointer type for argument %P "
5834 else
5837 }
5838 }
5840 /* Perform the conversions in CONVS on the expression EXPR. FN and
5841 ARGNUM are used for diagnostics. ARGNUM is zero based, -1
5842 indicates the `this' argument of a method. INNER is nonzero when
5843 being called to continue a conversion chain. It is negative when a
5844 reference binding will be applied, positive otherwise. If
5845 ISSUE_CONVERSION_WARNINGS is true, warnings about suspicious
5846 conversions will be emitted if appropriate. If C_CAST_P is true,
5847 this conversion is coming from a C-style cast; in that case,
5848 conversions to inaccessible bases are permitted. */
5850 static tree
5854 {
5856 diagnostic_t diag_kind;
5871 {
5874 /* Give a helpful error if this is bad because of excess braces. */
5882 {
5884 {
5891 complain);
5895 complain);
5896 else
5898 }
5900 {
5904 complain);
5906 }
5911 complain);
5914 }
5922 }
5928 {
5930 {
5935 /* When converting from an init list we consider explicit
5936 constructors, but actually trying to call one is an error. */
5938 /* Unless this is for direct-list-initialization. */
5941 {
5946 }
5948 /* If we're initializing from {}, it's value-initialization. */
5952 {
5957 {
5960 }
5962 }
5966 /* Set user_conv_p on the argument conversions, so rvalue/base
5967 handling knows not to allow any more UDCs. */
5973 /* If this is a constructor or a function returning an aggr type,
5974 we need to build up a TARGET_EXPR. */
5976 {
5979 /* Remember that this was list-initialization. */
5982 }
5985 }
5989 {
5995 else
5997 }
6001 /* Convert a constant to its underlying value, unless we are
6002 about to bind it to a reference, in which case we need to
6003 leave it as an lvalue. */
6005 {
6008 /* If __null has been converted to an integer type, we do not
6009 want to warn about uses of EXPR as an integer, rather than
6010 as a pointer. */
6012 }
6015 /* We leave bad_p off ck_ambig because overload resolution considers
6016 it valid, it just fails when we try to perform it. So we need to
6017 check complain here, too. */
6019 {
6020 /* Call build_user_type_conversion again for the error. */
6022 complain);
6026 }
6030 {
6031 /* Conversion to std::initializer_list<T>. */
6039 /* Convert all the elements. */
6041 {
6051 }
6052 /* Build up the array. */
6053 elttype = cp_build_qualified_type
6057 /* Take the address explicitly rather than via decay_conversion
6058 to avoid the error about taking the address of a temporary. */
6062 /* Build up the initializer_list object. */
6070 }
6074 {
6083 }
6086 complain);
6090 };
6095 c_cast_p,
6096 complain);
6101 {
6109 /* Else fall through. */
6112 {
6113 /* We are going to bind a reference directly to a base-class
6114 subobject of EXPR. */
6115 /* Build an expression for `*((base*) &expr)'. */
6121 }
6123 /* Copy-initialization where the cv-unqualified version of the source
6124 type is the same class as, or a derived class of, the class of the
6125 destination [is treated as direct-initialization]. [dcl.init] */
6128 /* This conversion is being done in the context of a user-defined
6129 conversion (i.e. the second step of copy-initialization), so
6130 don't allow any more. */
6136 /* Copy-list-initialization doesn't actually involve a copy. */
6145 {
6149 {
6159 }
6161 /* If necessary, create a temporary.
6163 VA_ARG_EXPR and CONSTRUCTOR expressions are special cases
6164 that need temporaries, even when their types are reference
6165 compatible with the type of reference being bound, so the
6166 upcoming call to cp_build_addr_expr doesn't fail. */
6170 {
6171 /* Otherwise, a temporary of type "cv1 T1" is created and
6172 initialized from the initializer expression using the rules
6173 for a non-reference copy-initialization (8.5). */
6182 {
6183 /* If the reference is volatile or non-const, we
6184 cannot create a temporary. */
6191 else
6195 }
6196 /* If the source is a packed field, and we must use a copy
6197 constructor, then building the target expr will require
6198 binding the field to the reference parameter to the
6199 copy constructor, and we'll end up with an infinite
6200 loop. If we can use a bitwise copy, then we'll be
6201 OK. */
6205 {
6209 }
6211 {
6214 }
6216 }
6218 /* Take the address of the thing to which we will bind the
6219 reference. */
6224 /* Convert it to a pointer to the type referred to by the
6225 reference. This will adjust the pointer if a derived to
6226 base conversion is being performed. */
6229 /* Convert the pointer to the desired reference type. */
6231 }
6237 /* Warn about deprecated conversion if appropriate. */
6253 }
6260 else
6264 }
6266 /* ARG is being passed to a varargs function. Perform any conversions
6267 required. Return the converted value. */
6269 tree
6271 {
6272 tree arg_type;
6275 /* [expr.call]
6277 The lvalue-to-rvalue, array-to-pointer, and function-to-pointer
6278 standard conversions are performed. */
6281 /* [expr.call]
6283 If the argument has integral or enumeration type that is subject
6284 to the integral promotions (_conv.prom_), or a floating point
6285 type that is subject to the floating point promotion
6286 (_conv.fpprom_), the value of the argument is converted to the
6287 promoted type before the call. */
6292 {
6296 "implicit conversion from %qT to %qT when passing "
6300 }
6304 {
6306 {
6311 }
6313 }
6319 /* In a template (or ill-formed code), we can have an incomplete type
6320 even after require_complete_type_sfinae, in which case we don't know
6321 whether it has trivial copy or not. */
6323 {
6324 /* Build up a real lvalue-to-rvalue conversion in case the
6325 copy constructor is trivial but not callable. */
6329 /* [expr.call] 5.2.2/7:
6330 Passing a potentially-evaluated argument of class type (Clause 9)
6331 with a non-trivial copy constructor or a non-trivial destructor
6332 with no corresponding parameter is conditionally-supported, with
6333 implementation-defined semantics.
6335 We used to just warn here and do a bitwise copy, but now
6336 cp_expr_size will abort if we try to do that.
6338 If the call appears in the context of a sizeof expression,
6339 it is not potentially-evaluated. */
6343 {
6347 else
6349 }
6350 }
6353 }
6355 /* va_arg (EXPR, TYPE) is a builtin. Make sure it is not abused. */
6357 tree
6359 {
6373 {
6374 /* Remove reference types so we don't ICE later on. */
6376 /* conditionally-supported behavior [expr.call] 5.2.2/7. */
6382 }
6385 }
6387 /* TYPE has been given to va_arg. Apply the default conversions which
6388 would have happened when passed via ellipsis. Return the promoted
6389 type, or the passed type if there is no change. */
6391 tree
6393 {
6394 tree promote;
6396 /* Perform the array-to-pointer and function-to-pointer
6397 conversions. */
6405 }
6407 /* ARG is a default argument expression being passed to a parameter of
6408 the indicated TYPE, which is a parameter to FN. PARMNUM is the
6409 zero-based argument number. Do any required conversions. Return
6410 the converted value. */
6413 void
6417 void
6421 tree
6423 tsubst_flags_t complain)
6424 {
6426 tree t;
6428 /* See through clones. */
6431 /* Detect recursion. */
6434 {
6438 }
6440 /* If the ARG is an unparsed default argument expression, the
6441 conversion cannot be performed. */
6443 {
6448 }
6455 /* Due to:
6457 [dcl.fct.default]
6459 The names in the expression are bound, and the semantic
6460 constraints are checked, at the point where the default
6461 expressions appears.
6463 we must not perform access checks here. */
6465 /* We must make a copy of ARG, in case subsequent processing
6466 alters any part of it. */
6469 {
6473 complain);
6474 }
6475 else
6476 {
6479 complain);
6481 }
6487 }
6489 /* Returns the type which will really be used for passing an argument of
6490 type TYPE. */
6492 tree
6494 {
6495 /* Pass classes with copy ctors by invisible reference. */
6497 {
6499 /* There are no other pointers to this temporary. */
6501 }
6510 }
6512 /* Actually perform the appropriate conversion. */
6514 tree
6516 {
6517 tree bitfield_type;
6519 /* If VAL is a bitfield, then -- since it has already been converted
6520 to TYPE -- it cannot have a precision greater than TYPE.
6522 If it has a smaller precision, we must widen it here. For
6523 example, passing "int f:3;" to a function expecting an "int" will
6524 not result in any conversion before this point.
6526 If the precision is the same we must not risk widening. For
6527 example, the COMPONENT_REF for a 32-bit "long long" bitfield will
6528 often have type "int", even though the C++ type for the field is
6529 "long long". If the value is being passed to a function
6530 expecting an "int", then no conversions will be required. But,
6531 if we call convert_bitfield_to_declared_type, the bitfield will
6532 be converted to "long long". */
6539 ;
6540 /* Pass classes with copy ctors by invisible reference. */
6551 {
6560 }
6562 }
6564 /* Returns true iff FN is a function with magic varargs, i.e. ones for
6565 which no conversions at all should be done. This is true for some
6566 builtins which don't act like normal functions. */
6568 bool
6570 {
6576 {
6586 }
6589 }
6591 /* Returns the decl of the dispatcher function if FN is a function version. */
6593 tree
6595 {
6605 {
6609 }
6614 }
6616 /* fn is a function version dispatcher that is marked used. Mark all the
6617 semantically identical function versions it will dispatch as used. */
6619 void
6621 {
6638 /* All semantically identical versions are chained. Traverse and mark each
6639 one of them as used. */
6642 {
6645 }
6646 }
6648 /* Subroutine of the various build_*_call functions. Overload resolution
6649 has chosen a winning candidate CAND; build up a CALL_EXPR accordingly.
6650 ARGS is a TREE_LIST of the unconverted arguments to the call. FLAGS is a
6651 bitmask of various LOOKUP_* flags which apply to the call itself. */
6653 static tree
6655 {
6663 tree val;
6672 /* In a template, there is no need to perform all of the work that
6673 is normally done. We are only interested in the type of the call
6674 expression, i.e., the return type of the function. Any semantic
6675 errors will be deferred until the template is instantiated. */
6677 {
6679 tree return_type;
6687 else
6688 {
6691 tree arg;
6699 }
6709 }
6711 /* Give any warnings we noticed during overload resolution. */
6713 {
6717 }
6719 /* Make =delete work with SFINAE. */
6724 {
6725 tree access_fn;
6726 /* If FN is a template function, two cases must be considered.
6727 For example:
6729 struct A {
6730 protected:
6731 template <class T> void f();
6732 };
6733 template <class T> struct B {
6734 protected:
6735 void g();
6736 };
6737 struct C : A, B<int> {
6738 using A::f; // #1
6739 using B<int>::g; // #2
6740 };
6742 In case #1 where `A::f' is a member template, DECL_ACCESS is
6743 recorded in the primary template but not in its specialization.
6744 We check access of FN using its primary template.
6746 In case #2, where `B<int>::g' has a DECL_TEMPLATE_INFO simply
6747 because it is a member of class template B, DECL_ACCESS is
6748 recorded in the specialization `B<int>::g'. We cannot use its
6749 primary template because `B<T>::g' and `B<int>::g' may have
6750 different access. */
6754 else
6759 }
6761 /* If we're checking for implicit delete, don't bother with argument
6762 conversions. */
6764 {
6766 {
6770 }
6774 /* Reject bad conversions now. */
6776 /* else continue to get conversion error. */
6777 }
6779 /* N3276 magic doesn't apply to nested calls. */
6783 /* Find maximum size of vector to hold converted arguments. */
6790 /* The implicit parameters to a constructor are not considered by overload
6791 resolution, and must be of the proper type. */
6793 {
6794 tree object_arg;
6796 {
6799 }
6800 else
6801 {
6804 }
6807 /* We should never try to call the abstract constructor. */
6811 {
6815 }
6816 }
6817 /* Bypass access control for 'this' parameter. */
6819 {
6822 ? first_arg
6825 tree converted_arg;
6826 tree base_binfo;
6829 {
6833 else
6835 }
6837 /* See if the function member or the whole class type is declared
6838 final and the call can be devirtualized. */
6843 /* [class.mfct.nonstatic]: If a nonstatic member function of a class
6844 X is called for an object that is not of type X, or of a type
6845 derived from X, the behavior is undefined.
6847 So we can assume that anything passed as 'this' is non-null, and
6848 optimize accordingly. */
6850 /* Convert to the base in which the function was declared. */
6853 arg,
6856 /* Check that the base class is accessible. */
6859 {
6864 else
6866 }
6867 /* If fn was found by a using declaration, the conversion path
6868 will be to the derived class, not the base declaring fn. We
6869 must convert from derived to base. */
6880 else
6884 }
6889 {
6896 /* If the argument is NULL and used to (implicitly) instantiate a
6897 template function (and bind one of the template arguments to
6898 the type of 'long int'), we don't want to warn about passing NULL
6899 to non-pointer argument.
6900 For example, if we have this template function:
6902 template<typename T> void func(T x) {}
6904 we want to warn (when -Wconversion is enabled) in this case:
6906 void foo() {
6907 func<int>(NULL);
6908 }
6910 but not in this case:
6912 void foo() {
6913 func(NULL);
6914 }
6915 */
6922 /* Warn about initializer_list deduction that isn't currently in the
6923 working draft. */
6925 && flag_deduce_init_list
6929 {
6942 {
6949 }
6950 }
6952 conversion_warning
6953 ? complain
6960 else
6962 }
6964 /* Default arguments */
6966 {
6972 complain);
6973 }
6975 /* Ellipsis */
6977 {
6980 /* Do no conversions for magic varargs. */
6982 else
6985 }
6992 /* Avoid actually calling copy constructors and copy assignment operators,
6993 if possible. */
7000 {
7001 tree targ;
7003 tree fa;
7006 /* Pull out the real argument, disregarding const-correctness. */
7012 {
7017 }
7018 else
7023 else
7026 /* [class.copy]: the copy constructor is implicitly defined even if
7027 the implementation elided its use. */
7029 {
7032 }
7034 /* If we're creating a temp and we already have one, don't create a
7035 new one. If we're not creating a temp but we get one, use
7036 INIT_EXPR to collapse the temp into our target. Otherwise, if the
7037 ctor is trivial, do a bitwise copy with a simple TARGET_EXPR for a
7038 temp or an INIT_EXPR otherwise. */
7041 {
7046 }
7048 {
7050 complain));
7054 }
7055 }
7059 {
7060 tree to = stabilize_reference
7067 {
7068 /* Avoid copying empty classes. */
7073 }
7075 {
7078 }
7079 else
7080 {
7081 /* We must only copy the non-tail padding parts. */
7089 build_index_type
7098 }
7101 }
7106 /* FIXME handle trivial default constructor, too. */
7108 /* For calls to a multi-versioned function, overload resolution
7109 returns the function with the highest target priority, that is,
7110 the version that will checked for dispatching first. If this
7111 version is inlinable, a direct call to this version can be made
7112 otherwise the call should go through the dispatcher. */
7117 {
7123 }
7130 /* Don't mess with virtual lookup in fold_non_dependent_expr; virtual
7131 functions can't be constexpr. */
7133 {
7134 tree t;
7140 /* Warn about deprecated virtual functions now, since we're about
7141 to throw away the decl. */
7146 complain);
7152 else
7155 }
7156 else
7157 {
7161 }
7164 }
7166 /* Build and return a call to FN, using NARGS arguments in ARGARRAY.
7167 This function performs no overload resolution, conversion, or other
7168 high-level operations. */
7170 tree
7172 tsubst_flags_t complain)
7173 {
7174 tree fndecl;
7177 /* Remember roughly where this call is. */
7184 /* Check that arguments to builtin functions match the expectations. */
7191 /* If it is a built-in array notation function, then the return type of
7192 the function is the element type of the array passed in as array
7193 notation (i.e. the first parameter of the function). */
7195 {
7204 {
7205 /* for bif == BUILT_IN_CILKPLUS_SEC_REDUCE_ALL_ZERO or
7206 BUILT_IN_CILKPLUS_SEC_REDUCE_ANY_ZERO or
7207 BUILT_IN_CILKPLUS_SEC_REDUCE_ANY_NONZERO or
7208 BUILT_IN_CILKPLUS_SEC_REDUCE_ALL_NONZERO or
7209 BUILT_IN_CILKPLUS_SEC_REDUCE_MIN_IND or
7210 BUILT_IN_CILKPLUS_SEC_REDUCE_MAX_IND
7211 The pre-defined return-type is the correct one. */
7215 }
7216 }
7218 /* Some built-in function calls will be evaluated at compile-time in
7219 fold (). Set optimize to 1 when folding __builtin_constant_p inside
7220 a constexpr function so that fold_builtin_1 doesn't fold it to 0. */
7223 && current_function_decl
7232 /* 5.2.2/11: If a function call is a prvalue of object type: if the
7233 function call is either the operand of a decltype-specifier or the
7234 right operand of a comma operator that is the operand of a
7235 decltype-specifier, a temporary object is not introduced for the
7236 prvalue. The type of the prvalue may be incomplete. */
7238 {
7245 }
7247 }
7251 /* Make an expression which yields the address of the Java interface
7252 method FN. This is achieved by generating a call to libjava's
7253 _Jv_LookupInterfaceMethodIdx(). */
7255 static tree
7257 {
7263 {
7267 java_iface_lookup_fn
7270 }
7272 /* Look up the pointer to the runtime java.lang.Class object for `instance'.
7273 This is the first entry in the vtable. */
7275 tf_warning_or_error),
7276 integer_zero_node);
7278 /* Get the java.lang.Class pointer for the interface being called. */
7283 {
7285 iface);
7287 }
7291 /* Determine the itable index of FN. */
7294 {
7299 i++;
7300 }
7305 java_iface_lookup_fn);
7308 }
7310 /* Returns the value to use for the in-charge parameter when making a
7311 call to a function with the indicated NAME.
7313 FIXME:Can't we find a neater way to do this mapping? */
7315 tree
7317 {
7328 /* This function should only be called with one of the names listed
7329 above. */
7332 }
7334 /* Build a call to a constructor, destructor, or an assignment
7335 operator for INSTANCE, an expression with class type. NAME
7336 indicates the special member function to call; *ARGS are the
7337 arguments. ARGS may be NULL. This may change ARGS. BINFO
7338 indicates the base of INSTANCE that is to be passed as the `this'
7339 parameter to the member function called.
7341 FLAGS are the LOOKUP_* flags to use when processing the call.
7343 If NAME indicates a complete object constructor, INSTANCE may be
7344 NULL_TREE. In this case, the caller will call build_cplus_new to
7345 store the newly constructed object into a VAR_DECL. */
7347 tree
7350 {
7351 tree fns;
7352 /* The type of the subobject to be constructed or destroyed. */
7353 tree class_type;
7355 tree ret;
7364 {
7365 /* Resolve the name. */
7370 }
7376 /* Handle the special case where INSTANCE is NULL_TREE. */
7378 {
7381 }
7382 else
7383 {
7389 /* Convert to the base class, if necessary. */
7392 {
7394 /* For constructors and destructors, either the base is
7395 non-virtual, or it is virtual but we are doing the
7396 conversion from a constructor or destructor for the
7397 complete object. In either case, we can convert
7398 statically. */
7400 else
7401 /* However, for assignment operators, we must convert
7402 dynamically if the base is virtual. */
7405 }
7406 }
7412 /* When making a call to a constructor or destructor for a subobject
7413 that uses virtual base classes, pass down a pointer to a VTT for
7414 the subobject. */
7418 {
7419 tree vtt;
7420 tree sub_vtt;
7422 /* If the current function is a complete object constructor
7423 or destructor, then we fetch the VTT directly.
7424 Otherwise, we look it up using the VTT we were given. */
7432 current_vtt_parm,
7433 vtt);
7436 else
7440 {
7443 }
7446 }
7451 complain);
7465 }
7467 /* Return the NAME, as a C string. The NAME indicates a function that
7468 is a member of TYPE. *FREE_P is set to true if the caller must
7469 free the memory returned.
7471 Rather than go through all of this, we should simply set the names
7472 of constructors and destructors appropriately, and dispense with
7473 ctor_identifier, dtor_identifier, etc. */
7477 {
7480 /* Assume that we will not allocate memory. */
7482 /* Constructors and destructors are special. */
7484 {
7485 pretty_name
7487 /* For a destructor, add the '~'. */
7491 {
7493 /* Remember that we need to free the memory allocated. */
7495 }
7496 }
7498 {
7501 TFF_PLAIN_IDENTIFIER),
7502 NULL);
7503 /* Remember that we need to free the memory allocated. */
7505 }
7506 else
7510 }
7512 /* Build a call to "INSTANCE.FN (ARGS)". If FN_P is non-NULL, it will
7513 be set, upon return, to the function called. ARGS may be NULL.
7514 This may change ARGS. */
7516 static tree
7520 {
7525 tree optype;
7527 tree name;
7530 tree call;
7531 tree fn;
7534 tree orig_instance;
7535 tree orig_fns;
7541 /* We don't know what function we're going to call, yet. */
7550 {
7554 }
7559 /* Dismantle the baselink to collect all the information we need. */
7567 {
7571 }
7582 {
7587 }
7590 /* Under DR 147 A::A() is an invalid constructor call,
7591 not a functional cast. */
7593 {
7603 complain);
7605 }
7607 /* Figure out whether to skip the first argument for the error
7608 message we will display to users if an error occurs. We don't
7609 want to display any compiler-generated arguments. The "this"
7610 pointer hasn't been added yet. However, we must remove the VTT
7611 pointer if this is a call to a base-class constructor or
7612 destructor. */
7615 {
7616 /* Callers should explicitly indicate whether they want to construct
7617 the complete object or just the part without virtual bases. */
7619 /* Similarly for destructors. */
7621 /* Remove the VTT pointer, if present. */
7625 }
7627 /* Process the argument list. */
7629 {
7633 }
7635 /* Consider the object argument to be used even if we end up selecting a
7636 static member function. */
7639 /* It's OK to call destructors and constructors on cv-qualified objects.
7640 Therefore, convert the INSTANCE to the unqualified type, if
7641 necessary. */
7644 {
7646 {
7650 }
7651 }
7657 /* Get the high-water mark for the CONVERSION_OBSTACK. */
7660 /* If CONSTRUCTOR_IS_DIRECT_INIT is set, this was a T{ } form
7661 initializer, not T({ }). */
7665 {
7672 /* If the initializer list has no elements and T is a class type with
7673 a default constructor, the object is value-initialized. Handle
7674 this here so we don't need to handle it wherever we use
7675 build_special_member_call. */
7678 /* For a user-provided default constructor, use the normal
7679 mechanisms so that protected access works. */
7684 /* If BASETYPE is an aggregate, we need to do aggregate
7685 initialization. */
7690 {
7697 }
7699 /* Otherwise go ahead with overload resolution. */
7704 }
7705 else
7706 {
7710 }
7715 {
7717 {
7724 else
7725 {
7728 tree arglist;
7739 }
7741 }
7743 }
7744 else
7745 {
7748 {
7751 tree arglist;
7754 {
7760 arglist);
7764 }
7766 }
7767 else
7768 {
7778 /* This is not an error, it is runtime undefined
7779 behavior. */
7781 "pure virtual %q#D called from constructor"
7783 fn);
7787 {
7792 {
7793 /* We captured 'this' in the current lambda now that
7794 we know we really need it. */
7796 }
7797 else
7798 {
7801 fn);
7803 }
7804 }
7807 {
7808 /* Optimize away vtable lookup if we know that this
7809 function can't be overridden. We need to check if
7810 the context and the type where we found fn are the same,
7811 actually FN might be defined in a different class
7812 type because of a using-declaration. In this case, we
7813 do not want to perform a non-virtual call. */
7815 && same_type_ignoring_top_level_qualifiers_p
7821 /* Now we know what function is being called. */
7824 /* Build the actual CALL_EXPR. */
7826 /* In an expression of the form `a->f()' where `f' turns
7827 out to be a static member function, `a' is
7828 none-the-less evaluated. */
7837 /* An explicit call of the form "x->~X()" has type
7838 "void". However, on platforms where destructors
7839 return "this" (i.e., those where
7840 targetm.cxx.cdtor_returns_this is true), such calls
7841 will appear to have a return value of pointer type
7842 to the low-level call machinery. We do not want to
7843 change the low-level machinery, since we want to be
7844 able to optimize "delete f()" on such platforms as
7845 "operator delete(~X(f()))" (rather than generating
7846 "t = f(), ~X(t), operator delete (t)"). */
7848 }
7849 }
7850 }
7853 {
7859 {
7862 }
7865 call = (build_min_non_dep_call_vec
7869 orig_args));
7874 }
7876 /* Free all the conversions we allocated. */
7883 }
7885 /* Wrapper for above. */
7887 tree
7891 {
7892 tree ret;
7898 }
7900 /* Returns true iff standard conversion sequence ICS1 is a proper
7901 subsequence of ICS2. */
7903 static bool
7905 {
7906 /* We can assume that a conversion of the same code
7907 between the same types indicates a subsequence since we only get
7908 here if the types we are converting from are the same. */
7915 {
7925 /* At this point, ICS1 cannot be a proper subsequence of
7926 ICS2. We can get a USER_CONV when we are comparing the
7927 second standard conversion sequence of two user conversion
7928 sequences. */
7938 }
7939 }
7941 /* Returns nonzero iff DERIVED is derived from BASE. The inputs may
7942 be any _TYPE nodes. */
7944 bool
7946 {
7950 /* We only allow proper derivation here. The DERIVED_FROM_P macro
7951 considers every class derived from itself. */
7954 }
7956 /* We build the ICS for an implicit object parameter as a pointer
7957 conversion sequence. However, such a sequence should be compared
7958 as if it were a reference conversion sequence. If ICS is the
7959 implicit conversion sequence for an implicit object parameter,
7960 modify it accordingly. */
7962 static void
7964 {
7966 {
7967 /* [over.match.funcs]
7969 For non-static member functions, the type of the
7970 implicit object parameter is "reference to cv X"
7971 where X is the class of which the function is a
7972 member and cv is the cv-qualification on the member
7973 function declaration. */
7975 tree reference_type;
7977 /* The `this' parameter is a pointer to a class type. Make the
7978 implicit conversion talk about a reference to that same class
7979 type. */
7992 }
7993 }
7995 /* If *ICS is a REF_BIND set *ICS to the remainder of the conversion,
7996 and return the initial reference binding conversion. Otherwise,
7997 leave *ICS unchanged and return NULL. */
8001 {
8003 {
8008 }
8011 }
8013 /* Compare two implicit conversion sequences according to the rules set out in
8014 [over.ics.rank]. Return values:
8016 1: ics1 is better than ics2
8017 -1: ics2 is better than ics1
8018 0: ics1 and ics2 are indistinguishable */
8020 static int
8022 {
8023 tree from_type1;
8024 tree from_type2;
8025 tree to_type1;
8026 tree to_type2;
8033 /* REF_BINDING is nonzero if the result of the conversion sequence
8034 is a reference type. In that case REF_CONV is the reference
8035 binding conversion. */
8039 /* Handle implicit object parameters. */
8043 /* Handle reference parameters. */
8047 /* List-initialization sequence L1 is a better conversion sequence than
8048 list-initialization sequence L2 if L1 converts to
8049 std::initializer_list<X> for some X and L2 does not. */
8055 /* [over.ics.rank]
8057 When comparing the basic forms of implicit conversion sequences (as
8058 defined in _over.best.ics_)
8060 --a standard conversion sequence (_over.ics.scs_) is a better
8061 conversion sequence than a user-defined conversion sequence
8062 or an ellipsis conversion sequence, and
8064 --a user-defined conversion sequence (_over.ics.user_) is a
8065 better conversion sequence than an ellipsis conversion sequence
8066 (_over.ics.ellipsis_). */
8076 {
8077 /* Both ICS are bad. We try to make a decision based on what would
8078 have happened if they'd been good. This is not an extension,
8079 we'll still give an error when we build up the call; this just
8080 helps us give a more helpful error message. */
8089 /* We couldn't make up our minds; try to figure it out below. */
8090 }
8093 /* Both conversions are ellipsis conversions. */
8096 /* User-defined conversion sequence U1 is a better conversion sequence
8097 than another user-defined conversion sequence U2 if they contain the
8098 same user-defined conversion operator or constructor and if the sec-
8099 ond standard conversion sequence of U1 is better than the second
8100 standard conversion sequence of U2. */
8102 /* Handle list-conversion with the same code even though it isn't always
8103 ranked as a user-defined conversion and it doesn't have a second
8104 standard conversion sequence; it will still have the desired effect.
8105 Specifically, we need to do the reference binding comparison at the
8106 end of this function. */
8109 {
8125 {
8128 }
8129 else
8130 {
8131 /* For ambiguous or aggregate conversions, use the target type as
8132 a proxy for the conversion function. */
8135 }
8137 /* We can just fall through here, after setting up
8138 FROM_TYPE1 and FROM_TYPE2. */
8141 }
8142 else
8143 {
8147 /* We're dealing with two standard conversion sequences.
8149 [over.ics.rank]
8151 Standard conversion sequence S1 is a better conversion
8152 sequence than standard conversion sequence S2 if
8154 --S1 is a proper subsequence of S2 (comparing the conversion
8155 sequences in the canonical form defined by _over.ics.scs_,
8156 excluding any Lvalue Transformation; the identity
8157 conversion sequence is considered to be a subsequence of
8158 any non-identity conversion sequence */
8169 }
8171 /* One sequence can only be a subsequence of the other if they start with
8172 the same type. They can start with different types when comparing the
8173 second standard conversion sequence in two user-defined conversion
8174 sequences. */
8176 {
8181 }
8183 /* [over.ics.rank]
8185 Or, if not that,
8187 --the rank of S1 is better than the rank of S2 (by the rules
8188 defined below):
8190 Standard conversion sequences are ordered by their ranks: an Exact
8191 Match is a better conversion than a Promotion, which is a better
8192 conversion than a Conversion.
8194 Two conversion sequences with the same rank are indistinguishable
8195 unless one of the following rules applies:
8197 --A conversion that does not a convert a pointer, pointer to member,
8198 or std::nullptr_t to bool is better than one that does.
8200 The ICS_STD_RANK automatically handles the pointer-to-bool rule,
8201 so that we do not have to check it explicitly. */
8210 /* A conversion from scalar arithmetic type to complex is worse than a
8211 conversion between scalar arithmetic types. */
8218 {
8221 else
8223 }
8229 {
8234 }
8235 /* The rules for pointers to members A::* are just like the rules
8236 for pointers A*, except opposite: if B is derived from A then
8237 A::* converts to B::*, not vice versa. For that reason, we
8238 switch the from_ and to_ variables here. */
8245 {
8250 }
8255 {
8256 /* This was one of the pointer or pointer-like conversions.
8258 [over.ics.rank]
8260 --If class B is derived directly or indirectly from class A,
8261 conversion of B* to A* is better than conversion of B* to
8262 void*, and conversion of A* to void* is better than
8263 conversion of B* to void*. */
8266 {
8268 deref_from_type2))
8271 deref_from_type1))
8273 }
8276 {
8278 {
8280 {
8282 deref_to_type1))
8284 }
8285 /* We know that DEREF_TO_TYPE1 is `void' here. */
8287 deref_to_type2))
8289 }
8290 }
8293 {
8294 /* [over.ics.rank]
8296 --If class B is derived directly or indirectly from class A
8297 and class C is derived directly or indirectly from B,
8299 --conversion of C* to B* is better than conversion of C* to
8300 A*,
8302 --conversion of B* to A* is better than conversion of C* to
8303 A* */
8305 {
8307 deref_to_type2))
8310 deref_to_type1))
8312 }
8314 {
8316 deref_from_type1))
8319 deref_from_type2))
8321 }
8322 }
8323 }
8326 {
8329 /* [over.ics.rank]
8331 --binding of an expression of type C to a reference of type
8332 B& is better than binding an expression of type C to a
8333 reference of type A&
8335 --conversion of C to B is better than conversion of C to A, */
8338 {
8343 }
8344 }
8347 {
8350 /* [over.ics.rank]
8352 --binding of an expression of type B to a reference of type
8353 A& is better than binding an expression of type C to a
8354 reference of type A&,
8356 --conversion of B to A is better than conversion of C to A */
8359 {
8364 }
8365 }
8367 /* [over.ics.rank]
8369 --S1 and S2 differ only in their qualification conversion and yield
8370 similar types T1 and T2 (_conv.qual_), respectively, and the cv-
8371 qualification signature of type T1 is a proper subset of the cv-
8372 qualification signature of type T2 */
8376 {
8380 }
8382 /* [over.ics.rank]
8384 --S1 and S2 are reference bindings (_dcl.init.ref_) and neither refers
8385 to an implicit object parameter, and either S1 binds an lvalue reference
8386 to an lvalue and S2 binds an rvalue reference or S1 binds an rvalue
8387 reference to an rvalue and S2 binds an lvalue reference
8388 (C++0x draft standard, 13.3.3.2)
8390 --S1 and S2 are reference bindings (_dcl.init.ref_), and the
8391 types to which the references refer are the same type except for
8392 top-level cv-qualifiers, and the type to which the reference
8393 initialized by S2 refers is more cv-qualified than the type to
8394 which the reference initialized by S1 refers.
8396 DR 1328 [over.match.best]: the context is an initialization by
8397 conversion function for direct reference binding (13.3.1.6) of a
8398 reference to function type, the return type of F1 is the same kind of
8399 reference (i.e. lvalue or rvalue) as the reference being initialized,
8400 and the return type of F2 is not. */
8403 {
8410 {
8413 }
8418 }
8420 /* Neither conversion sequence is better than the other. */
8422 }
8424 /* The source type for this standard conversion sequence. */
8426 static tree
8428 {
8430 {
8435 }
8437 }
8439 /* Note a warning about preferring WINNER to LOSER. We do this by storing
8440 a pointer to LOSER and re-running joust to produce the warning if WINNER
8441 is actually used. */
8443 static void
8445 {
8451 }
8453 /* Compare two candidates for overloading as described in
8454 [over.match.best]. Return values:
8456 1: cand1 is better than cand2
8457 -1: cand2 is better than cand1
8458 0: cand1 and cand2 are indistinguishable */
8460 static int
8462 tsubst_flags_t complain)
8463 {
8469 /* Candidates that involve bad conversions are always worse than those
8470 that don't. */
8476 /* If we have two pseudo-candidates for conversions to the same type,
8477 or two candidates for the same function, arbitrarily pick one. */
8482 /* Prefer a non-deleted function over an implicitly deleted move
8483 constructor or assignment operator. This differs slightly from the
8484 wording for issue 1402 (which says the move op is ignored by overload
8485 resolution), but this way produces better error messages. */
8489 {
8496 }
8498 /* a viable function F1
8499 is defined to be a better function than another viable function F2 if
8500 for all arguments i, ICSi(F1) is not a worse conversion sequence than
8501 ICSi(F2), and then */
8503 /* for some argument j, ICSj(F1) is a better conversion sequence than
8504 ICSj(F2) */
8506 /* For comparing static and non-static member functions, we ignore
8507 the implicit object parameter of the non-static function. The
8508 standard says to pretend that the static function has an object
8509 parm, but that won't work with operator overloading. */
8512 {
8518 /* We're comparing a near-match list constructor and a near-match
8519 non-list constructor. Just treat them as unordered. */
8526 else
8527 {
8530 }
8531 }
8534 {
8540 {
8542 && warn_sign_promo
8554 {
8561 else
8566 {
8570 }
8571 else
8573 }
8576 {
8579 }
8581 }
8582 }
8584 /* warn about confusing overload resolution for user-defined conversions,
8585 either between a constructor and a conversion op, or between two
8586 conversion ops. */
8591 {
8597 else
8600 /* We don't want to complain about `X::operator T1 ()'
8601 beating `X::operator T2 () const', when T2 is a no less
8602 cv-qualified version of T1. */
8605 {
8610 {
8613 }
8616 }
8617 else
8623 {
8630 {
8632 }
8633 }
8634 else
8636 }
8641 /* DR 495 moved this tiebreaker above the template ones. */
8642 /* or, if not that,
8643 the context is an initialization by user-defined conversion (see
8644 _dcl.init_ and _over.match.user_) and the standard conversion
8645 sequence from the return type of F1 to the destination type (i.e.,
8646 the type of the entity being initialized) is a better conversion
8647 sequence than the standard conversion sequence from the return type
8648 of F2 to the destination type. */
8651 {
8655 }
8657 /* or, if not that,
8658 F1 is a non-template function and F2 is a template function
8659 specialization. */
8666 /* or, if not that,
8667 F1 and F2 are template functions and the function template for F1 is
8668 more specialized than the template for F2 according to the partial
8669 ordering rules. */
8672 {
8673 winner = more_specialized_fn
8676 /* [temp.func.order]: The presence of unused ellipsis and default
8677 arguments has no effect on the partial ordering of function
8678 templates. add_function_candidate() will not have
8679 counted the "this" argument for constructors. */
8683 }
8685 /* Check whether we can discard a builtin candidate, either because we
8686 have two identical ones or matching builtin and non-builtin candidates.
8688 (Pedantically in the latter case the builtin which matched the user
8689 function should not be added to the overload set, but we spot it here.
8691 [over.match.oper]
8692 ... the builtin candidates include ...
8693 - do not have the same parameter type list as any non-template
8694 non-member candidate. */
8697 {
8703 {
8705 /* Two built-in candidates; arbitrarily pick one. */
8708 /* cand1 is built-in; prefer cand2. */
8710 else
8711 /* cand2 is built-in; prefer cand1. */
8713 }
8714 }
8716 /* For candidates of a multi-versioned function, make the version with
8717 the highest priority win. This version will be checked for dispatching
8718 first. If this version can be inlined into the caller, the front-end
8719 will simply make a direct call to this function. */
8725 {
8731 /* Check if cand1->fn and cand2->fn are versions of the same function. It
8732 is possible that cand1->fn and cand2->fn are function versions but of
8733 different functions. Check types to see if they are versions of the same
8734 function. */
8737 {
8738 /* Always make the version with the higher priority, more
8739 specialized, win. */
8743 else
8745 }
8746 }
8748 /* If the two function declarations represent the same function (this can
8749 happen with declarations in multiple scopes and arg-dependent lookup),
8750 arbitrarily choose one. But first make sure the default args we're
8751 using match. */
8754 {
8761 {
8762 /* Don't crash if the fn is variadic. */
8767 }
8775 {
8778 {
8780 {
8782 {
8784 "default argument mismatch in "
8786 {
8791 }
8792 }
8793 else
8795 }
8796 else
8799 }
8802 }
8805 }
8807 tweak:
8809 /* Extension: If the worst conversion for one candidate is worse than the
8810 worst conversion for the other, take the first. */
8812 {
8817 {
8822 }
8828 {
8829 /* Don't choose a deleted function over ambiguity. */
8833 {
8835 "ISO C++ says that these are ambiguous, even "
8836 "though the worst conversion for the first is better than "
8840 }
8841 else
8844 }
8845 }
8849 }
8851 /* Given a list of candidates for overloading, find the best one, if any.
8852 This algorithm has a worst case of O(2n) (winner is last), and a best
8853 case of O(n/2) (totally ambiguous); much better than a sorting
8854 algorithm. */
8858 {
8863 /* Walk through the list once, comparing each current champ to the next
8864 candidate, knocking out a candidate or two with each comparison. */
8867 {
8871 else
8872 {
8874 {
8879 }
8880 else
8881 {
8884 }
8887 }
8888 }
8890 /* Make sure the champ is better than all the candidates it hasn't yet
8891 been compared to. */
8894 challenger != champ
8897 {
8901 }
8904 }
8906 /* Returns nonzero if things of type FROM can be converted to TO. */
8908 bool
8910 {
8912 /* implicit_conversion only considers user-defined conversions
8913 if it has an expression for the call argument list. */
8917 }
8919 /* Returns nonzero if things of type FROM can be converted to TO with a
8920 standard conversion. */
8922 bool
8924 {
8926 }
8928 /* Returns nonzero if ARG (of type FROM) can be converted to TO. */
8930 bool
8932 tsubst_flags_t complain)
8933 {
8938 /* Get the high-water mark for the CONVERSION_OBSTACK. */
8940 /* We want to discard any access checks done for this test,
8941 as we might not be in the appropriate access context and
8942 we'll do the check again when we actually perform the
8943 conversion. */
8950 /* Discard the access checks now. */
8952 /* Free all the conversions we allocated. */
8956 }
8958 /* Like can_convert_arg, but allows dubious conversions as well. */
8960 bool
8962 tsubst_flags_t complain)
8963 {
8967 /* Get the high-water mark for the CONVERSION_OBSTACK. */
8969 /* Try to perform the conversion. */
8972 /* Free all the conversions we allocated. */
8976 }
8978 /* Convert EXPR to TYPE. Return the converted expression.
8980 Note that we allow bad conversions here because by the time we get to
8981 this point we are committed to doing the conversion. If we end up
8982 doing a bad conversion, convert_like will complain. */
8984 tree
8987 {
8995 /* Get the high-water mark for the CONVERSION_OBSTACK. */
9003 {
9005 {
9006 /* If expr has unknown type, then it is an overloaded function.
9007 Call instantiate_type to get good error messages. */
9012 else
9015 }
9017 }
9019 {
9020 /* In a template, we are only concerned about determining the
9021 type of non-dependent expressions, so we do not have to
9022 perform the actual conversion. But for initializers, we
9023 need to be able to perform it at instantiation
9024 (or fold_non_dependent_expr) time. */
9028 }
9029 else
9032 /* Free all the conversions we allocated. */
9036 }
9038 tree
9040 {
9042 LOOKUP_IMPLICIT);
9043 }
9045 /* Convert EXPR to TYPE (as a direct-initialization) if that is
9046 permitted. If the conversion is valid, the converted expression is
9047 returned. Otherwise, NULL_TREE is returned, except in the case
9048 that TYPE is a class type; in that case, an error is issued. If
9049 C_CAST_P is true, then this direct-initialization is taking
9050 place as part of a static_cast being attempted as part of a C-style
9051 cast. */
9053 tree
9055 tree expr,
9057 tsubst_flags_t complain)
9058 {
9064 /* [dcl.init]
9066 If the destination type is a (possibly cv-qualified) class type:
9068 -- If the initialization is direct-initialization ...,
9069 constructors are considered. ... If no constructor applies, or
9070 the overload resolution is ambiguous, the initialization is
9071 ill-formed. */
9073 {
9079 }
9081 /* Get the high-water mark for the CONVERSION_OBSTACK. */
9085 c_cast_p,
9089 else
9092 c_cast_p,
9093 complain);
9095 /* Free all the conversions we allocated. */
9099 }
9101 /* When initializing a reference that lasts longer than a full-expression,
9102 this special rule applies:
9104 [class.temporary]
9106 The temporary to which the reference is bound or the temporary
9107 that is the complete object to which the reference is bound
9108 persists for the lifetime of the reference.
9110 The temporaries created during the evaluation of the expression
9111 initializing the reference, except the temporary to which the
9112 reference is bound, are destroyed at the end of the
9113 full-expression in which they are created.
9115 In that case, we store the converted expression into a new
9116 VAR_DECL in a new scope.
9118 However, we want to be careful not to create temporaries when
9119 they are not required. For example, given:
9121 struct B {};
9122 struct D : public B {};
9123 D f();
9124 const B& b = f();
9126 there is no need to copy the return value from "f"; we can just
9127 extend its lifetime. Similarly, given:
9129 struct S {};
9130 struct T { operator S(); };
9131 T t;
9132 const S& s = t;
9134 we can extend the lifetime of the return value of the conversion
9135 operator.
9137 The next several functions are involved in this lifetime extension. */
9139 /* DECL is a VAR_DECL or FIELD_DECL whose type is a REFERENCE_TYPE. The
9140 reference is being bound to a temporary. Create and return a new
9141 VAR_DECL with the indicated TYPE; this variable will store the value to
9142 which the reference is bound. */
9144 tree
9146 {
9147 tree var;
9149 /* Create the variable. */
9152 /* Register the variable. */
9155 {
9156 /* Namespace-scope or local static; give it a mangled name. */
9157 /* FIXME share comdat with decl? */
9158 tree name;
9166 }
9167 else
9168 /* Create a new cleanup level if necessary. */
9172 }
9174 /* EXPR is the initializer for a variable DECL of reference or
9175 std::initializer_list type. Create, push and return a new VAR_DECL
9176 for the initializer so that it will live as long as DECL. Any
9177 cleanup for the new variable is returned through CLEANUP, and the
9178 code to initialize the new variable is returned through INITP. */
9180 static tree
9183 {
9184 tree init;
9185 tree type;
9186 tree var;
9188 /* Create the temporary variable. */
9192 /* If the rvalue is the result of a function call it will be
9193 a TARGET_EXPR. If it is some other construct (such as a
9194 member access expression where the underlying object is
9195 itself the result of a function call), turn it into a
9196 TARGET_EXPR here. It is important that EXPR be a
9197 TARGET_EXPR below since otherwise the INIT_EXPR will
9198 attempt to make a bitwise copy of EXPR to initialize
9199 VAR. */
9205 {
9209 }
9211 /* Recursively extend temps in this initializer. */
9215 /* Any reference temp has a non-trivial initializer. */
9218 /* If the initializer is constant, put it in DECL_INITIAL so we get
9219 static initialization and use in constant expressions. */
9222 {
9224 {
9225 /* 5.19 says that a constant expression can include an
9226 lvalue-rvalue conversion applied to "a glvalue of literal type
9227 that refers to a non-volatile temporary object initialized
9228 with a constant expression". Rather than try to communicate
9229 that this VAR_DECL is a temporary, just mark it constexpr.
9231 Currently this is only useful for initializer_list temporaries,
9232 since reference vars can't appear in constant expressions. */
9236 }
9239 }
9240 else
9241 /* Create the INIT_EXPR that will initialize the temporary
9242 variable. */
9245 {
9250 else
9251 {
9255 }
9257 /* We must be careful to destroy the temporary only
9258 after its initialization has taken place. If the
9259 initialization throws an exception, then the
9260 destructor should not be run. We cannot simply
9261 transform INIT into something like:
9263 (INIT, ({ CLEANUP_STMT; }))
9265 because emit_local_var always treats the
9266 initializer as a full-expression. Thus, the
9267 destructor would run too early; it would run at the
9268 end of initializing the reference variable, rather
9269 than at the end of the block enclosing the
9270 reference variable.
9272 The solution is to pass back a cleanup expression
9273 which the caller is responsible for attaching to
9274 the statement tree. */
9275 }
9276 else
9277 {
9280 {
9283 tls_aggregates);
9284 else
9286 static_aggregates);
9287 }
9288 else
9289 /* Check whether the dtor is callable. */
9291 }
9295 }
9297 /* Convert EXPR to the indicated reference TYPE, in a way suitable for
9298 initializing a variable of that TYPE. */
9300 tree
9303 {
9311 /* Get the high-water mark for the CONVERSION_OBSTACK. */
9317 {
9319 {
9328 else
9332 }
9334 }
9337 /* Perform the conversion. */
9340 /* We gave an error in build_user_type_conversion_1. */
9342 else
9345 /* Free all the conversions we allocated. */
9349 }
9351 /* Subroutine of extend_ref_init_temps. Possibly extend one initializer,
9352 which is bound either to a reference or a std::initializer_list. */
9354 static tree
9356 {
9361 {
9365 }
9368 /* Deal with binding to a subobject. */
9372 {
9378 }
9380 }
9382 /* INIT is part of the initializer for DECL. If there are any
9383 reference or initializer lists being initialized, extend their
9384 lifetime to match that of DECL. */
9386 tree
9388 {
9395 {
9396 /* The temporary array underlying a std::initializer_list
9397 is handled like a reference temporary. */
9402 {
9406 }
9407 }
9409 {
9415 }
9418 }
9420 /* Returns true iff an initializer for TYPE could contain temporaries that
9421 need to be extended because they are bound to references or
9422 std::initializer_list. */
9424 bool
9426 {
9431 {
9438 }
9440 }
9442 /* Returns true iff TYPE is some variant of std::initializer_list. */
9444 bool
9446 {
9447 /* Look through typedefs. */
9456 }
9458 /* Returns true iff DECL is a list constructor: i.e. a constructor which
9459 will accept an argument list of a single std::initializer_list<T>. */
9461 bool
9463 {
9465 tree arg;
9477 /* There are more non-defaulted parms. */
9481 }