| blob | b0b1a61cb245d4fc58b0af66ea194beb27c52c09 |
1 /* Functions related to invoking methods and overloaded functions.
2 Copyright (C) 1987-2013 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. */
46 /* The various kinds of conversion. */
49 ck_identity,
50 ck_lvalue,
51 ck_qual,
52 ck_std,
53 ck_ptr,
54 ck_pmem,
55 ck_base,
56 ck_ref_bind,
57 ck_user,
58 ck_ambig,
59 ck_list,
60 ck_aggr,
61 ck_rvalue
64 /* The rank of the conversion. Order of the enumerals matters; better
65 conversions should come earlier in the list. */
68 cr_identity,
69 cr_exact,
70 cr_promotion,
71 cr_std,
72 cr_pbool,
73 cr_user,
74 cr_ellipsis,
75 cr_bad
78 /* An implicit conversion sequence, in the sense of [over.best.ics].
79 The first conversion to be performed is at the end of the chain.
80 That conversion is always a cr_identity conversion. */
84 /* The kind of conversion represented by this step. */
85 conversion_kind kind;
86 /* The rank of this conversion. */
87 conversion_rank rank;
91 /* True if this conversion would be permitted with a bending of
92 language standards, e.g. disregarding pointer qualifiers or
93 converting integers to pointers. */
95 /* If KIND is ck_ref_bind ck_base_conv, true to indicate that a
96 temporary should be created to hold the result of the
97 conversion. */
99 /* If KIND is ck_ptr or ck_pmem, true to indicate that a conversion
100 from a pointer-to-derived to pointer-to-base is being performed. */
102 /* If KIND is ck_ref_bind, true when either an lvalue reference is
103 being bound to an lvalue expression or an rvalue reference is
104 being bound to an rvalue expression. If KIND is ck_rvalue,
105 true when we should treat an lvalue as an rvalue (12.8p33). If
106 KIND is ck_base, always false. */
109 /* The type of the expression resulting from the conversion. */
110 tree type;
112 /* The next conversion in the chain. Since the conversions are
113 arranged from outermost to innermost, the NEXT conversion will
114 actually be performed before this conversion. This variant is
115 used only when KIND is neither ck_identity, ck_ambig nor
116 ck_list. Please use the next_conversion function instead
117 of using this field directly. */
119 /* The expression at the beginning of the conversion chain. This
120 variant is used only if KIND is ck_identity or ck_ambig. */
121 tree expr;
122 /* The array of conversions for an initializer_list, so this
123 variant is used only when KIN D is ck_list. */
126 /* The function candidate corresponding to this conversion
127 sequence. This field is only used if KIND is ck_user. */
129 };
131 #define CONVERSION_RANK(NODE) \
132 ((NODE)->bad_p ? cr_bad \
133 : (NODE)->ellipsis_p ? cr_ellipsis \
134 : (NODE)->user_conv_p ? cr_user \
135 : (NODE)->rank)
137 #define BAD_CONVERSION_RANK(NODE) \
138 ((NODE)->ellipsis_p ? cr_ellipsis \
139 : (NODE)->user_conv_p ? cr_user \
140 : (NODE)->rank)
149 tsubst_flags_t);
153 #define convert_like(CONV, EXPR, COMPLAIN) \
154 convert_like_real ((CONV), (EXPR), NULL_TREE, 0, 0, \
157 #define convert_like_with_context(CONV, EXPR, FN, ARGNO, COMPLAIN ) \
158 convert_like_real ((CONV), (EXPR), (FN), (ARGNO), 0, \
166 tsubst_flags_t);
181 static void add_builtin_candidates
184 static void add_builtin_candidate
188 static void build_builtin_candidate
198 tsubst_flags_t);
201 tsubst_flags_t);
221 tsubst_flags_t);
225 /* Returns nonzero iff the destructor name specified in NAME matches BASETYPE.
226 NAME can take many forms... */
228 bool
230 {
231 /* Just accept something we've already complained about. */
240 {
246 else
248 }
249 else
250 {
251 /* In the case of:
253 template <class T> struct S { ~S(); };
254 int i;
255 i.~S();
257 NAME will be a class template. */
260 }
265 }
267 /* We want the address of a function or method. We avoid creating a
268 pointer-to-member function. */
270 tree
272 {
275 /* We have to do these by hand to avoid real pointer to member
276 functions. */
278 {
280 {
284 complain);
285 }
287 }
288 else
292 }
294 /* Build a CALL_EXPR, we can handle FUNCTION_TYPEs, METHOD_TYPEs, or
295 POINTER_TYPE to those. Note, pointer to member function types
296 (TYPE_PTRMEMFUNC_P) must be handled by our callers. There are
297 two variants. build_call_a is the primitive taking an array of
298 arguments, while build_call_n is a wrapper that handles varargs. */
300 tree
302 {
305 else
306 {
316 }
317 }
319 /* Update various flags in cfun and the call itself based on what is being
320 called. Split out of build_call_a so that bot_manip can use it too. */
322 void
324 {
328 /* We check both the decl and the type; a function may be known not to
329 throw without being declared throw(). */
340 }
342 tree
344 {
345 tree decl;
346 tree result_type;
347 tree fntype;
357 /* An rvalue has no cv-qualifiers. */
368 {
369 /* We invoke build_call directly for several library
370 functions. These may have been declared normally if
371 we're building libgcc, so we can't just check
372 DECL_ARTIFICIAL. */
377 }
385 /* Don't pass empty class objects by value. This is useful
386 for tags in STL, which are used to control overload resolution.
387 We don't need to handle other cases of copying empty classes. */
390 {
394 {
398 }
399 }
402 }
404 /* Build something of the form ptr->method (args)
405 or object.method (args). This can also build
406 calls to constructors, and find friends.
408 Member functions always take their class variable
409 as a pointer.
411 INSTANCE is a class instance.
413 NAME is the name of the method desired, usually an IDENTIFIER_NODE.
415 PARMS help to figure out what that NAME really refers to.
417 BASETYPE_PATH, if non-NULL, contains a chain from the type of INSTANCE
418 down to the real instance type to use for access checking. We need this
419 information to get protected accesses correct.
421 FLAGS is the logical disjunction of zero or more LOOKUP_
422 flags. See cp-tree.h for more info.
424 If this is all OK, calls build_function_call with the resolved
425 member function.
427 This function must also handle being called to perform
428 initialization, promotion/coercion of arguments, and
429 instantiation of default parameters.
431 Note that NAME may refer to an instance variable name. If
432 `operator()()' is defined for the type of that field, then we return
433 that result. */
435 /* New overloading code. */
443 };
445 /* Information for providing diagnostics about why overloading failed. */
448 rr_none,
449 rr_arity,
450 rr_explicit_conversion,
451 rr_template_conversion,
452 rr_arg_conversion,
453 rr_bad_arg_conversion,
454 rr_template_unification,
455 rr_invalid_copy
456 };
459 /* The index of the argument, 0-based. */
461 /* The type of the actual argument. */
462 tree from_type;
463 /* The type of the formal argument. */
464 tree to_type;
465 };
470 /* Information about an arity mismatch. */
472 /* The expected number of arguments. */
474 /* The actual number of arguments in the call. */
476 /* Whether the call was a varargs call. */
479 /* Information about an argument conversion mismatch. */
481 /* Same, but for bad argument conversions. */
483 /* Information about template unification failures. These are the
484 parameters passed to fn_type_unification. */
486 tree tmpl;
487 tree explicit_targs;
491 tree return_type;
492 unification_kind_t strict;
495 /* Information about template instantiation failures. These are the
496 parameters passed to instantiate_template. */
498 tree tmpl;
499 tree targs;
502 };
505 /* The FUNCTION_DECL that will be called if this candidate is
506 selected by overload resolution. */
507 tree fn;
508 /* If not NULL_TREE, the first argument to use when calling this
509 function. */
510 tree first_arg;
511 /* The rest of the arguments to use when calling this function. If
512 there are no further arguments this may be NULL or it may be an
513 empty vector. */
515 /* The implicit conversion sequences for each of the arguments to
516 FN. */
518 /* The number of implicit conversion sequences. */
520 /* If FN is a user-defined conversion, the standard conversion
521 sequence from the type returned by FN to the desired destination
522 type. */
526 /* If FN is a member function, the binfo indicating the path used to
527 qualify the name of FN at the call site. This path is used to
528 determine whether or not FN is accessible if it is selected by
529 overload resolution. The DECL_CONTEXT of FN will always be a
530 (possibly improper) base of this binfo. */
531 tree access_path;
532 /* If FN is a non-static member function, the binfo indicating the
533 subobject to which the `this' pointer should be converted if FN
534 is selected by overload resolution. The type pointed to by
535 the `this' pointer must correspond to the most derived class
536 indicated by the CONVERSION_PATH. */
537 tree conversion_path;
538 tree template_decl;
539 tree explicit_targs;
542 };
544 /* Returns true iff T is a null pointer constant in the sense of
545 [conv.ptr]. */
547 bool
549 {
550 /* [conv.ptr]
552 A null pointer constant is an integral constant expression
553 (_expr.const_) rvalue of integer type that evaluates to zero or
554 an rvalue of type std::nullptr_t. */
558 {
559 /* Core issue 903 says only literal 0 is a null pointer constant. */
565 }
567 }
569 /* Returns true iff T is a null member pointer value (4.11). */
571 bool
573 {
582 else
584 }
586 /* Returns nonzero if PARMLIST consists of only default parms,
587 ellipsis, and/or undeduced parameter packs. */
589 bool
591 {
598 }
600 /* Allocate N bytes of memory from the conversion obstack. The memory
601 is zeroed before being returned. */
605 {
608 {
611 }
615 }
617 /* Allocate rejection reasons. */
621 {
626 }
630 {
636 }
640 {
647 }
651 {
658 }
662 {
668 }
672 {
678 }
685 {
692 /* Copy args to our own storage. */
700 }
704 {
706 }
710 {
713 }
715 /* Dynamically allocate a conversion. */
719 {
724 }
726 #ifdef ENABLE_CHECKING
728 /* Make sure that all memory on the conversion obstack has been
729 freed. */
731 void
733 {
737 }
741 /* Dynamically allocate an array of N conversions. */
745 {
747 }
751 {
755 /* Note that the caller is responsible for filling in t->cand for
756 user-defined conversions. */
762 {
778 }
784 }
786 /* Represent a conversion from CTOR, a braced-init-list, to TYPE, a
787 specialization of std::initializer_list<T>, if such a conversion is
788 possible. */
792 {
798 tree val;
800 /* Within a list-initialization we can have more user-defined
801 conversions. */
803 /* But no narrowing conversions. */
807 {
808 conversion *sub
815 }
823 {
831 }
834 }
836 /* Return the next conversion of the conversion chain (if applicable),
837 or NULL otherwise. Please use this function instead of directly
838 accessing fields of struct conversion. */
842 {
849 }
851 /* Subroutine of build_aggr_conv: check whether CTOR, a braced-init-list,
852 is a valid aggregate initializer for array type ATYPE. */
854 static bool
856 {
860 {
866 else
868 complain);
871 }
873 }
875 /* Represent a conversion from CTOR, a braced-init-list, to TYPE, an
876 aggregate class, if such a conversion is possible. */
880 {
891 {
893 tree val;
898 else
899 {
903 }
909 else
911 complain);
918 }
929 }
931 /* Represent a conversion from CTOR, a braced-init-list, to TYPE, an
932 array type, if such a conversion is possible. */
936 {
941 tree val;
947 {
951 }
954 {
955 conversion *sub
967 }
976 }
978 /* Represent a conversion from CTOR, a braced-init-list, to TYPE, a
979 complex type, if such a conversion is possible. */
983 tsubst_flags_t complain)
984 {
989 tree val;
998 {
999 conversion *sub
1011 }
1020 }
1022 /* Build a representation of the identity conversion from EXPR to
1023 itself. The TYPE should match the type of EXPR, if EXPR is non-NULL. */
1027 {
1035 }
1037 /* Converting from EXPR to TYPE was ambiguous in the sense that there
1038 were multiple user-defined conversions to accomplish the job.
1039 Build a conversion that indicates that ambiguity. */
1043 {
1051 }
1053 tree
1055 {
1059 }
1061 /* Returns the standard conversion path (see [conv]) from type FROM to type
1062 TO, if any. For proper handling of null pointer constants, you must
1063 also pass the expression EXPR to convert from. If C_CAST_P is true,
1064 this conversion is coming from a C-style cast. */
1069 {
1073 tree qualified_to;
1077 {
1080 }
1087 {
1093 }
1100 {
1104 }
1106 {
1108 {
1109 tree bitfield_type;
1112 {
1115 }
1116 }
1120 }
1122 /* Allow conversion between `__complex__' data types. */
1124 {
1125 /* The standard conversion sequence to convert FROM to TO is
1126 the standard conversion sequence to perform componentwise
1127 conversion. */
1132 {
1135 }
1136 else
1140 }
1143 {
1147 }
1149 /* [conv.ptr]
1150 A null pointer constant can be converted to a pointer type; ... A
1151 null pointer constant of integral type can be converted to an
1152 rvalue of type std::nullptr_t. */
1159 {
1160 /* For backwards brain damage compatibility, allow interconversion of
1161 pointers and integers with a pedwarn. */
1164 }
1166 {
1167 /* For backwards brain damage compatibility, allow interconversion of
1168 enums and integers with a pedwarn. */
1171 }
1174 {
1175 tree to_pointee;
1176 tree from_pointee;
1181 ;
1185 {
1187 from = build_pointer_type
1191 }
1193 {
1198 && (same_type_ignoring_top_level_qualifiers_p
1201 {
1205 }
1208 }
1211 /* [conv.ptr]
1213 An rvalue of type "pointer to cv D," where D is a
1214 class type, can be converted to an rvalue of type
1215 "pointer to cv B," where B is a base class (clause
1216 _class.derived_) of D. If B is an inaccessible
1217 (clause _class.access_) or ambiguous
1218 (_class.member.lookup_) base class of D, a program
1219 that necessitates this conversion is ill-formed.
1220 Therefore, we use DERIVED_FROM_P, and do not check
1221 access or uniqueness. */
1223 {
1224 from =
1230 }
1233 {
1236 }
1237 else
1238 {
1241 }
1246 /* In a C-style cast, we ignore CV-qualification because we
1247 are allowed to perform a static_cast followed by a
1248 const_cast. */
1253 /* converting from string constant to char *. */
1255 /* Allow conversions among compatible ObjC pointer types (base
1256 conversions have been already handled above). */
1261 {
1264 }
1265 else
1269 }
1271 {
1283 tbase,
1289 }
1291 {
1292 /* [conv.bool]
1294 An rvalue of arithmetic, unscoped enumeration, pointer, or
1295 pointer to member type can be converted to an rvalue of type
1296 bool. ... An rvalue of type std::nullptr_t can be converted
1297 to an rvalue of type bool; */
1303 {
1312 }
1315 }
1316 /* We don't check for ENUMERAL_TYPE here because there are no standard
1317 conversions to enum type. */
1318 /* As an extension, allow conversion to complex type. */
1320 {
1327 /* Give this a better rank if it's a promotion. */
1331 }
1337 {
1341 /* The derived-to-base conversion indicates the initialization
1342 of a parameter with base type from an object of a derived
1343 type. A temporary object is created to hold the result of
1344 the conversion unless we're binding directly to a reference. */
1346 }
1347 else
1354 }
1356 /* Returns nonzero if T1 is reference-related to T2. */
1358 bool
1360 {
1367 /* [dcl.init.ref]
1369 Given types "cv1 T1" and "cv2 T2," "cv1 T1" is reference-related
1370 to "cv2 T2" if T1 is the same type as T2, or T1 is a base class
1371 of T2. */
1375 }
1377 /* Returns nonzero if T1 is reference-compatible with T2. */
1379 static bool
1381 {
1382 /* [dcl.init.ref]
1384 "cv1 T1" is reference compatible with "cv2 T2" if T1 is
1385 reference-related to T2 and cv1 is the same cv-qualification as,
1386 or greater cv-qualification than, cv2. */
1389 }
1391 /* A reference of the indicated TYPE is being bound directly to the
1392 expression represented by the implicit conversion sequence CONV.
1393 Return a conversion sequence for this binding. */
1397 {
1398 tree t;
1405 /* [over.ics.rank]
1407 When a parameter of reference type binds directly
1408 (_dcl.init.ref_) to an argument expression, the implicit
1409 conversion sequence is the identity conversion, unless the
1410 argument expression has a type that is a derived class of the
1411 parameter type, in which case the implicit conversion sequence is
1412 a derived-to-base Conversion.
1414 If the parameter binds directly to the result of applying a
1415 conversion function to the argument expression, the implicit
1416 conversion sequence is a user-defined conversion sequence
1417 (_over.ics.user_), with the second standard conversion sequence
1418 either an identity conversion or, if the conversion function
1419 returns an entity of a type that is a derived class of the
1420 parameter type, a derived-to-base conversion. */
1422 {
1423 /* Represent the derived-to-base conversion. */
1425 /* We will actually be binding to the base-class subobject in
1426 the derived class, so we mark this conversion appropriately.
1427 That way, convert_like knows not to generate a temporary. */
1429 }
1431 }
1433 /* Returns the conversion path from type FROM to reference type TO for
1434 purposes of reference binding. For lvalue binding, either pass a
1435 reference type to FROM or an lvalue expression to EXPR. If the
1436 reference will be bound to a temporary, NEED_TEMPORARY_P is set for
1437 the conversion returned. If C_CAST_P is true, this
1438 conversion is coming from a C-style cast. */
1442 tsubst_flags_t complain)
1443 {
1447 tree tfrom;
1450 cp_lvalue_kind gl_kind;
1454 {
1459 }
1462 {
1468 {
1473 }
1474 }
1477 {
1482 else
1484 }
1486 {
1489 /* A class prvalue is not a glvalue. */
1491 }
1492 else
1500 /* Figure out whether or not the types are reference-related and
1501 reference compatible. We have do do this after stripping
1502 references from FROM. */
1504 /* If this is a C cast, first convert to an appropriately qualified
1505 type, so that we can later do a const_cast to the desired type. */
1511 /* Directly bind reference when target expression's type is compatible with
1512 the reference and expression is an lvalue. In DR391, the wording in
1513 [8.5.3/5 dcl.init.ref] is changed to also require direct bindings for
1514 const and rvalue references to rvalues of compatible class type.
1515 We should also do direct bindings for non-class xvalues. */
1517 && (is_lvalue
1521 && (gl_kind
1525 {
1526 /* [dcl.init.ref]
1528 If the initializer expression
1530 -- is an lvalue (but not an lvalue for a bit-field), and "cv1 T1"
1531 is reference-compatible with "cv2 T2,"
1533 the reference is bound directly to the initializer expression
1534 lvalue.
1536 [...]
1537 If the initializer expression is an rvalue, with T2 a class type,
1538 and "cv1 T1" is reference-compatible with "cv2 T2", the reference
1539 is bound to the object represented by the rvalue or to a sub-object
1540 within that object. */
1546 /* The top-level caller requested that we pretend that the lvalue
1547 be treated as an rvalue. */
1550 /* Handle rvalue reference to function properly. */
1551 conv->rvaluedness_matches_p
1553 else
1554 conv->rvaluedness_matches_p
1559 /* For the purposes of overload resolution, we ignore the fact
1560 this expression is a bitfield or packed field. (In particular,
1561 [over.ics.ref] says specifically that a function with a
1562 non-const reference parameter is viable even if the
1563 argument is a bitfield.)
1565 However, when we actually call the function we must create
1566 a temporary to which to bind the reference. If the
1567 reference is volatile, or isn't const, then we cannot make
1568 a temporary, so we just issue an error when the conversion
1569 actually occurs. */
1572 /* Don't allow binding of lvalues (other than function lvalues) to
1573 rvalue references. */
1580 }
1581 /* [class.conv.fct] A conversion function is never used to convert a
1582 (possibly cv-qualified) object to the (possibly cv-qualified) same
1583 object type (or a reference to it), to a (possibly cv-qualified) base
1584 class of that type (or a reference to it).... */
1587 {
1588 /* [dcl.init.ref]
1590 If the initializer expression
1592 -- has a class type (i.e., T2 is a class type) can be
1593 implicitly converted to an lvalue of type "cv3 T3," where
1594 "cv1 T1" is reference-compatible with "cv3 T3". (this
1595 conversion is selected by enumerating the applicable
1596 conversion functions (_over.match.ref_) and choosing the
1597 best one through overload resolution. (_over.match_).
1599 the reference is bound to the lvalue result of the conversion
1600 in the second case. */
1602 complain);
1605 }
1607 /* From this point on, we conceptually need temporaries, even if we
1608 elide them. Only the cases above are "direct bindings". */
1612 /* [over.ics.rank]
1614 When a parameter of reference type is not bound directly to an
1615 argument expression, the conversion sequence is the one required
1616 to convert the argument expression to the underlying type of the
1617 reference according to _over.best.ics_. Conceptually, this
1618 conversion sequence corresponds to copy-initializing a temporary
1619 of the underlying type with the argument expression. Any
1620 difference in top-level cv-qualification is subsumed by the
1621 initialization itself and does not constitute a conversion. */
1623 /* [dcl.init.ref]
1625 Otherwise, the reference shall be to a non-volatile const type.
1627 Under C++0x, [8.5.3/5 dcl.init.ref] it may also be an rvalue reference */
1631 /* [dcl.init.ref]
1633 Otherwise, a temporary of type "cv1 T1" is created and
1634 initialized from the initializer expression using the rules for a
1635 non-reference copy initialization. If T1 is reference-related to
1636 T2, cv1 must be the same cv-qualification as, or greater
1637 cv-qualification than, cv2; otherwise, the program is ill-formed. */
1641 /* We're generating a temporary now, but don't bind any more in the
1642 conversion (specifically, don't slice the temporary returned by a
1643 conversion operator). */
1646 /* Core issue 899: When [copy-]initializing a temporary to be bound
1647 to the first parameter of a copy constructor (12.8) called with
1648 a single argument in the context of direct-initialization,
1649 explicit conversion functions are also considered.
1651 So don't set LOOKUP_ONLYCONVERTING in that case. */
1662 /* This reference binding, unlike those above, requires the
1663 creation of a temporary. */
1668 }
1670 /* Returns the implicit conversion sequence (see [over.ics]) from type
1671 FROM to type TO. The optional expression EXPR may affect the
1672 conversion. FLAGS are the usual overloading flags. If C_CAST_P is
1673 true, this conversion is coming from a C-style cast. */
1678 {
1685 /* Other flags only apply to the primary function in overload
1686 resolution, or after we've chosen one. */
1691 /* FIXME: actually we don't want warnings either, but we can't just
1692 have 'complain &= ~(tf_warning|tf_error)' because it would cause
1693 the regression of, eg, g++.old-deja/g++.benjamin/16077.C.
1694 We really ought not to issue that warning until we've committed
1695 to that conversion. */
1700 else
1707 {
1711 /* As an extension, allow list-initialization of _Complex. */
1713 {
1717 }
1719 /* Allow conversion from an initializer-list with one element to a
1720 scalar type. */
1722 {
1724 tree elt;
1730 else
1736 {
1739 /* Too many levels of braces, i.e. '{{1}}'. */
1742 }
1743 }
1746 }
1752 {
1764 /* We used to try to bind a reference to a temporary here, but that
1765 is now handled after the recursive call to this function at the end
1766 of reference_binding. */
1768 }
1771 }
1773 /* Add a new entry to the list of candidates. Used by the add_*_candidate
1774 functions. ARGS will not be changed until a single candidate is
1775 selected. */
1783 {
1800 }
1802 /* Return the number of remaining arguments in the parameter list
1803 beginning with ARG. */
1805 static int
1807 {
1812 n++;
1815 }
1817 /* Create an overload candidate for the function or method FN called
1818 with the argument list FIRST_ARG/ARGS and add it to CANDIDATES.
1819 FLAGS is passed on to implicit_conversion.
1821 This does not change ARGS.
1823 CTYPE, if non-NULL, is the type we want to pretend this function
1824 comes from for purposes of overload resolution. */
1831 tsubst_flags_t complain)
1832 {
1836 tree parmnode;
1842 /* At this point we should not see any functions which haven't been
1843 explicitly declared, except for friend functions which will have
1844 been found using argument dependent lookup. */
1847 /* The `this', `in_chrg' and VTT arguments to constructors are not
1848 considered in overload resolution. */
1850 {
1854 {
1857 }
1858 }
1859 else
1865 /* 13.3.2 - Viable functions [over.match.viable]
1866 First, to be a viable function, a candidate function shall have enough
1867 parameters to agree in number with the arguments in the list.
1869 We need to check this first; otherwise, checking the ICSes might cause
1870 us to produce an ill-formed template instantiation. */
1874 {
1878 }
1882 {
1886 }
1887 /* When looking for a function from a subobject from an implicit
1888 copy/move constructor/operator=, don't consider anything that takes (a
1889 reference to) an unrelated type. See c++/44909 and core 1092. */
1891 {
1897 else
1900 {
1903 ctype))
1905 }
1907 /* This only applies at the top level. */
1909 }
1914 /* Second, for F to be a viable function, there shall exist for each
1915 argument an implicit conversion sequence that converts that argument
1916 to the corresponding parameter of F. */
1921 {
1923 tree arg;
1932 else
1941 {
1947 /* The type of the implicit object parameter ('this') for
1948 overload resolution is not always the same as for the
1949 function itself; conversion functions are considered to
1950 be members of the class being converted, and functions
1951 introduced by a using-declaration are considered to be
1952 members of the class that uses them.
1954 Since build_over_call ignores the ICS for the `this'
1955 parameter, we can just change the parm type. */
1957 {
1958 parmtype = cp_build_qualified_type
1961 {
1962 /* If the function has a ref-qualifier, the implicit
1963 object parameter has reference type. */
1966 }
1967 else
1968 {
1972 }
1973 }
1975 /* Core issue 899: When [copy-]initializing a temporary to be bound
1976 to the first parameter of a copy constructor (12.8) called with
1977 a single argument in the context of direct-initialization,
1978 explicit conversion functions are also considered.
1980 So set LOOKUP_COPY_PARM to let reference_binding know that
1981 it's being called in that context. We generalize the above
1982 to handle move constructors and template constructors as well;
1983 the standardese should soon be updated similarly. */
1987 && (same_type_ignoring_top_level_qualifiers_p
1989 {
1992 /* We allow user-defined conversions within init-lists, but
1993 don't list-initialize the copy parm, as that would mean
1994 using two levels of braces for the same type. */
1998 }
1999 else
2005 }
2006 else
2007 {
2011 }
2018 {
2022 }
2025 {
2028 }
2029 }
2031 out:
2034 }
2036 /* Create an overload candidate for the conversion function FN which will
2037 be invoked for expression OBJ, producing a pointer-to-function which
2038 will in turn be called with the argument list FIRST_ARG/ARGLIST,
2039 and add it to CANDIDATES. This does not change ARGLIST. FLAGS is
2040 passed on to implicit_conversion.
2042 Actually, we don't really care about FN; we care about the type it
2043 converts to. There may be multiple conversion functions that will
2044 convert to that type, and we rely on build_user_type_conversion_1 to
2045 choose the best one; so when we create our candidate, we record the type
2046 instead of the function. */
2052 tsubst_flags_t complain)
2053 {
2071 /* Don't bother looking up the same type twice. */
2076 {
2084 else
2089 {
2093 }
2097 {
2101 }
2102 else
2103 {
2107 }
2114 {
2117 }
2124 }
2128 {
2132 }
2136 }
2138 static void
2142 {
2156 /* TRUTH_*_EXPR do "contextual conversion to bool", which means explicit
2157 conversion ops are allowed. We handle that here by just checking for
2158 boolean_type_node because other operators don't ask for it. COND_EXPR
2159 also does contextual conversion to bool for the first operand, but we
2160 handle that in build_conditional_expr, and type1 here is operand 2. */
2165 {
2172 {
2174 /* We need something for printing the candidate. */
2178 }
2180 {
2184 }
2186 }
2188 /* For COND_EXPR we rearranged the arguments; undo that now. */
2190 {
2195 complain);
2198 else
2199 {
2202 boolean_type_node);
2203 }
2204 }
2211 }
2213 static bool
2215 {
2217 }
2219 /* Returns nonzero if TYPE is a promoted arithmetic type. */
2221 static bool
2223 {
2224 /* [over.built]
2226 In this section, the term promoted integral type is used to refer
2227 to those integral types which are preserved by integral promotion
2228 (including e.g. int and long but excluding e.g. char).
2229 Similarly, the term promoted arithmetic type refers to promoted
2230 integral types plus floating types. */
2234 }
2236 /* Create any builtin operator overload candidates for the operator in
2237 question given the converted operand types TYPE1 and TYPE2. The other
2238 args are passed through from add_builtin_candidates to
2239 build_builtin_candidate.
2241 TYPE1 and TYPE2 may not be permissible, and we must filter them.
2242 If CODE is requires candidates operands of the same type of the kind
2243 of which TYPE1 and TYPE2 are, we add both candidates
2244 CODE (TYPE1, TYPE1) and CODE (TYPE2, TYPE2). */
2246 static void
2250 tsubst_flags_t complain)
2251 {
2253 {
2261 }
2264 {
2266 /* 4 For every pair T, VQ), where T is an arithmetic or enumeration type,
2267 and VQ is either volatile or empty, there exist candidate operator
2268 functions of the form
2269 VQ T& operator++(VQ T&);
2270 T operator++(VQ T&, int);
2271 5 For every pair T, VQ), where T is an enumeration type or an arithmetic
2272 type other than bool, and VQ is either volatile or empty, there exist
2273 candidate operator functions of the form
2274 VQ T& operator--(VQ T&);
2275 T operator--(VQ T&, int);
2276 6 For every pair T, VQ), where T is a cv-qualified or cv-unqualified
2277 complete object type, and VQ is either volatile or empty, there exist
2278 candidate operator functions of the form
2279 T*VQ& operator++(T*VQ&);
2280 T*VQ& operator--(T*VQ&);
2281 T* operator++(T*VQ&, int);
2282 T* operator--(T*VQ&, int); */
2291 {
2294 }
2297 /* 7 For every cv-qualified or cv-unqualified object type T, there
2298 exist candidate operator functions of the form
2300 T& operator*(T*);
2302 8 For every function type T, there exist candidate operator functions of
2303 the form
2304 T& operator*(T*); */
2314 /* 9 For every type T, there exist candidate operator functions of the form
2315 T* operator+(T*);
2317 10For every promoted arithmetic type T, there exist candidate operator
2318 functions of the form
2319 T operator+(T);
2320 T operator-(T); */
2330 /* 11For every promoted integral type T, there exist candidate operator
2331 functions of the form
2332 T operator~(T); */
2339 /* 12For every quintuple C1, C2, T, CV1, CV2), where C2 is a class type, C1
2340 is the same type as C2 or is a derived class of C2, T is a complete
2341 object type or a function type, and CV1 and CV2 are cv-qualifier-seqs,
2342 there exist candidate operator functions of the form
2343 CV12 T& operator->*(CV1 C1*, CV2 T C2::*);
2344 where CV12 is the union of CV1 and CV2. */
2348 {
2356 }
2359 /* 13For every pair of promoted arithmetic types L and R, there exist can-
2360 didate operator functions of the form
2361 LR operator*(L, R);
2362 LR operator/(L, R);
2363 LR operator+(L, R);
2364 LR 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 bool operator!=(L, R);
2371 where LR is the result of the usual arithmetic conversions between
2372 types L and R.
2374 14For every pair of types T and I, where T is a cv-qualified or cv-
2375 unqualified complete object type and I is a promoted integral type,
2376 there exist candidate operator functions of the form
2377 T* operator+(T*, I);
2378 T& operator[](T*, I);
2379 T* operator-(T*, I);
2380 T* operator+(I, T*);
2381 T& operator[](I, T*);
2383 15For every T, where T is a pointer to complete object type, there exist
2384 candidate operator functions of the form112)
2385 ptrdiff_t operator-(T, T);
2387 16For every pointer or enumeration type T, there exist candidate operator
2388 functions of the form
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);
2394 bool operator!=(T, T);
2396 17For every pointer to member type T, there exist candidate operator
2397 functions of the form
2398 bool operator==(T, T);
2399 bool operator!=(T, T); */
2406 {
2409 }
2422 {
2425 }
2427 {
2430 }
2431 /* Fall through. */
2448 {
2451 }
2455 {
2458 }
2466 {
2469 }
2471 {
2474 }
2477 /* 18For every pair of promoted integral types L and R, there exist candi-
2478 date operator functions of the form
2479 LR operator%(L, R);
2480 LR operator&(L, R);
2481 LR operator^(L, R);
2482 LR operator|(L, R);
2483 L operator<<(L, R);
2484 L operator>>(L, R);
2485 where LR is the result of the usual arithmetic conversions between
2486 types L and R. */
2494 if (INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (type1) && INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (type2))
2498 /* 19For every triple L, VQ, R), where L is an arithmetic or enumeration
2499 type, VQ is either volatile or empty, and R is a promoted arithmetic
2500 type, there exist candidate operator functions of the form
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);
2505 VQ L& operator-=(VQ L&, R);
2507 20For every pair T, VQ), where T is any type and VQ is either volatile
2508 or empty, there exist candidate operator functions of the form
2509 T*VQ& operator=(T*VQ&, T*);
2511 21For every pair T, VQ), where T is a pointer to member type and VQ is
2512 either volatile or empty, there exist candidate operator functions of
2513 the form
2514 VQ T& operator=(VQ T&, T);
2516 22For every triple T, VQ, I), where T is a cv-qualified or cv-
2517 unqualified complete object type, VQ is either volatile or empty, and
2518 I is a promoted integral type, there exist candidate operator func-
2519 tions of the form
2520 T*VQ& operator+=(T*VQ&, I);
2521 T*VQ& operator-=(T*VQ&, I);
2523 23For every triple L, VQ, R), where L is an integral or enumeration
2524 type, VQ is either volatile or empty, and R is a promoted integral
2525 type, there exist candidate operator functions of the form
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);
2532 VQ L& operator|=(VQ L&, R); */
2536 {
2540 {
2543 }
2556 if (INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (type1) && INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (type2))
2569 {
2572 }
2577 }
2582 /* [over.built]
2584 For every pair of promoted arithmetic types L and R, there
2585 exist candidate operator functions of the form
2587 LR operator?(bool, L, R);
2589 where LR is the result of the usual arithmetic conversions
2590 between types L and R.
2592 For every type T, where T is a pointer or pointer-to-member
2593 type, there exist candidate operator functions of the form T
2594 operator?(bool, T, T); */
2598 /* That's OK. */
2601 /* Otherwise, the types should be pointers. */
2605 /* We don't check that the two types are the same; the logic
2606 below will actually create two candidates; one in which both
2607 parameter types are TYPE1, and one in which both parameter
2608 types are TYPE2. */
2619 }
2621 /* If we're dealing with two pointer types or two enumeral types,
2622 we need candidates for both of them. */
2631 {
2633 {
2635 error_mark_node,
2636 error_mark_node,
2637 CPO_CONVERSION,
2638 tf_none);
2640 {
2641 build_builtin_candidate
2645 }
2646 }
2648 build_builtin_candidate
2650 build_builtin_candidate
2653 }
2655 build_builtin_candidate
2657 }
2659 tree
2661 {
2667 }
2669 /* There are three conditions of builtin candidates:
2671 1) bool-taking candidates. These are the same regardless of the input.
2672 2) pointer-pair taking candidates. These are generated for each type
2673 one of the input types converts to.
2674 3) arithmetic candidates. According to the standard, we should generate
2675 all of these, but I'm trying not to...
2677 Here we generate a superset of the possible candidates for this particular
2678 case. That is a subset of the full set the standard defines, plus some
2679 other cases which the standard disallows. add_builtin_candidate will
2680 filter out the invalid set. */
2682 static void
2686 {
2690 /* TYPES[i] is the set of possible builtin-operator parameter types
2691 we will consider for the Ith argument. */
2696 {
2699 else
2701 }
2704 {
2705 /* 4 For every pair T, VQ), where T is an arithmetic or enumeration type,
2706 and VQ is either volatile or empty, there exist candidate operator
2707 functions of the form
2708 VQ T& operator++(VQ T&); */
2718 /* 24There also exist candidate operator functions of the form
2719 bool operator!(bool);
2720 bool operator&&(bool, bool);
2721 bool operator||(bool, bool); */
2724 build_builtin_candidate
2731 build_builtin_candidate
2749 /* Fall through. */
2753 }
2759 {
2761 ;
2763 {
2764 tree convs;
2772 {
2777 }
2783 {
2796 {
2802 }
2806 }
2807 }
2808 else
2809 {
2814 {
2820 }
2822 }
2823 }
2825 /* Run through the possible parameter types of both arguments,
2826 creating candidates with those parameter types. */
2828 {
2830 tree u;
2834 add_builtin_candidate
2837 else
2838 add_builtin_candidate
2841 }
2845 }
2848 /* If TMPL can be successfully instantiated as indicated by
2849 EXPLICIT_TARGS and ARGLIST, adds the instantiation to CANDIDATES.
2851 TMPL is the template. EXPLICIT_TARGS are any explicit template
2852 arguments. ARGLIST is the arguments provided at the call-site.
2853 This does not change ARGLIST. The RETURN_TYPE is the desired type
2854 for conversion operators. If OBJ is NULL_TREE, FLAGS and CTYPE are
2855 as for add_function_candidate. If an OBJ is supplied, FLAGS and
2856 CTYPE are ignored, and OBJ is as for add_conv_candidate. */
2864 tsubst_flags_t complain)
2865 {
2875 tree arg;
2877 tree fn;
2881 /* We don't do deduction on the in-charge parameter, the VTT
2882 parameter or 'this'. */
2884 {
2887 else
2889 }
2894 {
2897 else
2899 }
2909 {
2912 }
2916 {
2919 }
2924 args_without_in_chrg,
2925 nargs_without_in_chrg,
2930 {
2931 /* Don't repeat unification later if it already resulted in errors. */
2935 nargs_without_in_chrg,
2937 else
2940 }
2942 /* In [class.copy]:
2944 A member function template is never instantiated to perform the
2945 copy of a class object to an object of its class type.
2947 It's a little unclear what this means; the standard explicitly
2948 does allow a template to be used to copy a class. For example,
2949 in:
2951 struct A {
2952 A(A&);
2953 template <class T> A(const T&);
2954 };
2955 const A f ();
2956 void g () { A a (f ()); }
2958 the member template will be used to make the copy. The section
2959 quoted above appears in the paragraph that forbids constructors
2960 whose only parameter is (a possibly cv-qualified variant of) the
2961 class type, and a logical interpretation is that the intent was
2962 to forbid the instantiation of member templates which would then
2963 have that form. */
2965 {
2968 ctype))
2969 {
2972 }
2973 }
2976 /* Aha, this is a conversion function. */
2979 else
2984 /* This situation can occur if a member template of a template
2985 class is specialized. Then, instantiate_template might return
2986 an instantiation of the specialization, in which case the
2987 DECL_TI_TEMPLATE field will point at the original
2988 specialization. For example:
2990 template <class T> struct S { template <class U> void f(U);
2991 template <> void f(int) {}; };
2992 S<double> sd;
2993 sd.f(3);
2995 Here, TMPL will be template <class U> S<double>::f(U).
2996 And, instantiate template will give us the specialization
2997 template <> S<double>::f(int). But, the DECL_TI_TEMPLATE field
2998 for this will point at template <class T> template <> S<T>::f(int),
2999 so that we can find the definition. For the purposes of
3000 overload resolution, however, we want the original TMPL. */
3002 else
3007 fail:
3010 }
3019 {
3020 return
3025 }
3034 {
3035 return
3039 complain);
3040 }
3042 /* The CANDS are the set of candidates that were considered for
3043 overload resolution. Return the set of viable candidates, or CANDS
3044 if none are viable. If any of the candidates were viable, set
3045 *ANY_VIABLE_P to true. STRICT_P is true if a candidate should be
3046 considered viable only if it is strictly viable. */
3052 {
3057 /* Be strict inside templates, since build_over_call won't actually
3058 do the conversions to get pedwarns. */
3068 {
3071 {
3077 }
3078 else
3080 }
3083 }
3085 static bool
3087 {
3092 }
3094 /* OBJ is being used in an expression like "OBJ.f (...)". In other
3095 words, it is about to become the "this" pointer for a member
3096 function call. Take the address of the object. */
3098 static tree
3100 {
3101 /* In a template, we are only concerned about the type of the
3102 expression, so we can take a shortcut. */
3107 }
3109 /* Returns true iff functions are equivalent. Equivalent functions are
3110 not '==' only if one is a function-local extern function or if
3111 both are extern "C". */
3115 {
3124 }
3126 /* Print information about a candidate being rejected due to INFO. */
3128 static void
3130 {
3132 /* Conversion of implicit `this' argument failed. */
3136 else
3139 }
3141 /* Print information about a candidate with WANT parameters and we found
3142 HAVE. */
3144 static void
3146 {
3151 }
3153 /* Print information about one overload candidate CANDIDATE. MSGSTR
3154 is the text to print before the candidate itself.
3156 NOTE: Unlike most diagnostic functions in GCC, MSGSTR is expected
3157 to have been run through gettext by the caller. This wart makes
3158 life simpler in print_z_candidates and for the translators. */
3160 static void
3163 {
3170 {
3181 else
3184 }
3191 else
3193 /* Give the user some information about why this candidate failed. */
3195 {
3199 {
3212 "cannot be converted to %qT with a qualification "
3218 "conversion function specialization to %qT is not an "
3223 /* We use template_unification_error_rejection if unification caused
3224 actual non-SFINAE errors, in which case we don't need to repeat
3225 them here. */
3227 {
3231 }
3232 /* Re-run template unification with diagnostics. */
3236 (make_tree_vec
3247 " a constructor taking a single argument of its own "
3252 /* This candidate didn't have any issues or we failed to
3253 handle a particular code. Either way... */
3255 }
3256 }
3257 }
3259 static void
3261 {
3269 /* Remove non-viable deleted candidates. */
3272 {
3277 else
3279 }
3280 /* ...if there are any non-deleted ones. */
3284 /* There may be duplicates in the set of candidates. We put off
3285 checking this condition as long as possible, since we have no way
3286 to eliminate duplicates from a set of functions in less than n^2
3287 time. Now we are about to emit an error message, so it is more
3288 permissible to go slowly. */
3290 {
3292 /* Skip builtin candidates and conversion functions. */
3297 {
3301 else
3303 }
3304 }
3307 n_candidates++;
3312 }
3314 /* USER_SEQ is a user-defined conversion sequence, beginning with a
3315 USER_CONV. STD_SEQ is the standard conversion sequence applied to
3316 the result of the conversion function to convert it to the final
3317 desired type. Merge the two sequences into a single sequence,
3318 and return the merged sequence. */
3322 {
3328 /* Find the end of the second conversion sequence. */
3330 {
3331 /* The entire sequence is a user-conversion sequence. */
3335 }
3337 /* Replace the identity conversion with the user conversion
3338 sequence. */
3342 }
3344 /* Handle overload resolution for initializing an object of class type from
3345 an initializer list. First we look for a suitable constructor that
3346 takes a std::initializer_list; if we don't find one, we then look for a
3347 non-list constructor.
3349 Parameters are as for add_candidates, except that the arguments are in
3350 the form of a CONSTRUCTOR (the initializer list) rather than a vector, and
3351 the RETURN_TYPE parameter is replaced by TOTYPE, the desired type. */
3353 static void
3360 tsubst_flags_t complain)
3361 {
3366 /* We're looking for a ctor for list-initialization. */
3368 /* And we don't allow narrowing conversions. We also use this flag to
3369 avoid the copy constructor call for copy-list-initialization. */
3372 /* Always use the default constructor if the list is empty (DR 990). */
3375 ;
3376 /* If the class has a list ctor, try passing the list as a single
3377 argument first, but only consider list ctors. */
3379 {
3387 }
3391 /* We aren't looking for list-ctors anymore. */
3393 /* We allow more user-defined conversions within an init-list. */
3399 }
3401 /* Returns the best overload candidate to perform the requested
3402 conversion. This function is used for three the overloading situations
3403 described in [over.match.copy], [over.match.conv], and [over.match.ref].
3404 If TOTYPE is a REFERENCE_TYPE, we're trying to find a direct binding as
3405 per [dcl.init.ref], so we ignore temporary bindings. */
3409 tsubst_flags_t complain)
3410 {
3412 tree fromtype;
3426 /* We represent conversion within a hierarchy using RVALUE_CONV and
3427 BASE_CONV, as specified by [over.best.ics]; these become plain
3428 constructor calls, as specified in [dcl.init]. */
3433 /* Use lookup_fnfields_slot instead of lookup_fnfields to avoid
3434 creating a garbage BASELINK; constructors can't be inherited. */
3438 {
3443 {
3444 /* [class.conv.fct] A conversion function is never used to
3445 convert a (possibly cv-qualified) object to the (possibly
3446 cv-qualified) same object type (or a reference to it), to a
3447 (possibly cv-qualified) base class of that type (or a
3448 reference to it)... */
3449 }
3450 else
3452 }
3459 /* It's OK to bind a temporary for converting constructor arguments, but
3460 not in converting the return value of a conversion operator. */
3465 {
3471 /* We should never try to call the abstract or base constructor
3472 from here. */
3477 {
3478 /* List-initialization. */
3482 }
3483 else
3484 {
3489 }
3492 {
3495 /* If totype isn't a reference, and LOOKUP_NO_TEMP_BIND isn't
3496 set, then this is copy-initialization. In that case, "The
3497 result of the call is then used to direct-initialize the
3498 object that is the destination of the copy-initialization."
3499 [dcl.init]
3501 We represent this in the conversion sequence with an
3502 rvalue conversion, which means a constructor call. */
3505 cand->second_conv
3507 }
3508 }
3514 {
3518 /* If we are called to convert to a reference type, we are trying to
3519 find a direct binding, so don't even consider temporaries. If
3520 we don't find a direct binding, the caller will try again to
3521 look for a temporary binding. */
3532 {
3534 conversion *ics
3536 rettype,
3539 complain);
3541 /* If LOOKUP_NO_TEMP_BIND isn't set, then this is
3542 copy-initialization. In that case, "The result of the
3543 call is then used to direct-initialize the object that is
3544 the destination of the copy-initialization." [dcl.init]
3546 We represent this in the conversion sequence with an
3547 rvalue conversion, which means a constructor call. But
3548 don't add a second rvalue conversion if there's already
3549 one there. Which there really shouldn't be, but it's
3550 harmless since we'd add it here anyway. */
3558 {
3562 }
3565 {
3566 /* 13.3.1.5: For direct-initialization, those explicit
3567 conversion functions that are not hidden within S and
3568 yield type T or a type that can be converted to type T
3569 with a qualification conversion (4.4) are also candidate
3570 functions. */
3571 /* 13.3.1.6 doesn't have a parallel restriction, but it should;
3572 I've raised this issue with the committee. --jason 9/2011 */
3575 }
3577 {
3579 cand->reason
3582 }
3585 {
3586 /* 13.3.3.1.2: If the user-defined conversion is specified by
3587 a specialization of a conversion function template, the
3588 second standard conversion sequence shall have exact match
3589 rank. */
3592 }
3593 }
3594 }
3598 {
3602 }
3606 {
3608 {
3612 }
3619 /* If there are viable candidates, don't set ICS_BAD_FLAG; an
3620 ambiguous conversion is no worse than another user-defined
3621 conversion. */
3624 }
3626 /* Build the user conversion sequence. */
3627 conv = build_conv
3636 /* Remember that this was a list-initialization. */
3640 /* Combine it with the second conversion sequence. */
3645 }
3647 /* Wrapper for above. */
3649 tree
3651 tsubst_flags_t complain)
3652 {
3654 tree ret;
3660 {
3663 else
3664 {
3667 }
3668 }
3669 else
3674 }
3676 /* Subroutine of convert_nontype_argument.
3678 EXPR is an argument for a template non-type parameter of integral or
3679 enumeration type. Do any necessary conversions (that are permitted for
3680 non-type arguments) to convert it to the parameter type.
3682 If conversion is successful, returns the converted expression;
3683 otherwise, returns error_mark_node. */
3685 tree
3687 {
3690 tree t;
3698 /* Get the high-water mark for the CONVERSION_OBSTACK. */
3705 /* for a non-type template-parameter of integral or
3706 enumeration type, integral promotions (4.5) and integral
3707 conversions (4.7) are applied. */
3708 /* It should be sufficient to check the outermost conversion step, since
3709 there are no qualification conversions to integer type. */
3712 {
3713 /* A conversion function is OK. If it isn't constexpr, we'll
3714 complain later that the argument isn't constant. */
3716 /* The lvalue-to-rvalue conversion is OK. */
3729 /* and fall through. */
3734 }
3738 else
3741 /* Free all the conversions we allocated. */
3745 }
3747 /* Do any initial processing on the arguments to a function call. */
3751 {
3753 tree arg;
3756 {
3760 {
3764 }
3767 }
3769 }
3771 /* Perform overload resolution on FN, which is called with the ARGS.
3773 Return the candidate function selected by overload resolution, or
3774 NULL if the event that overload resolution failed. In the case
3775 that overload resolution fails, *CANDIDATES will be the set of
3776 candidates considered, and ANY_VIABLE_P will be set to true or
3777 false to indicate whether or not any of the candidates were
3778 viable.
3780 The ARGS should already have gone through RESOLVE_ARGS before this
3781 function is called. */
3788 {
3790 tree explicit_targs;
3801 /* Check FN. */
3808 {
3812 }
3814 /* Add the various candidate functions. */
3819 LOOKUP_NORMAL,
3825 else
3830 }
3832 /* Print an error message about being unable to build a call to FN with
3833 ARGS. ANY_VIABLE_P indicates whether any candidate functions could
3834 be located; CANDIDATES is a possibly empty list of such
3835 functions. */
3837 static void
3840 {
3847 else
3852 }
3854 /* Return an expression for a call to FN (a namespace-scope function,
3855 or a static member function) with the ARGS. This may change
3856 ARGS. */
3858 tree
3860 tsubst_flags_t complain)
3861 {
3865 tree result;
3868 {
3872 }
3877 /* If this function was found without using argument dependent
3878 lookup, then we want to ignore any undeclared friend
3879 functions. */
3881 {
3886 {
3890 }
3891 }
3893 /* Get the high-water mark for the CONVERSION_OBSTACK. */
3897 complain);
3900 {
3902 {
3909 }
3911 }
3912 else
3913 {
3915 /* If fn is template_id_expr, the call has explicit template arguments
3916 (e.g. func<int>(5)), communicate this info to build_over_call
3917 through flags so that later we can use it to decide whether to warn
3918 about peculiar null pointer conversion. */
3922 }
3924 /* Free all the conversions we allocated. */
3928 }
3930 /* Build a call to a global operator new. FNNAME is the name of the
3931 operator (either "operator new" or "operator new[]") and ARGS are
3932 the arguments provided. This may change ARGS. *SIZE points to the
3933 total number of bytes required by the allocation, and is updated if
3934 that is changed here. *COOKIE_SIZE is non-NULL if a cookie should
3935 be used. If this function determines that no cookie should be
3936 used, after all, *COOKIE_SIZE is set to NULL_TREE. If SIZE_CHECK
3937 is not NULL_TREE, it is evaluated before calculating the final
3938 array size, and if it fails, the array size is replaced with
3939 (size_t)-1 (usually triggering a std::bad_alloc exception). If FN
3940 is non-NULL, it will be set, upon return, to the allocation
3941 function called. */
3943 tree
3947 {
3949 tree fns;
3956 /* Set to (size_t)-1 if the size check fails. */
3958 {
3964 }
3970 /* Based on:
3972 [expr.new]
3974 If this lookup fails to find the name, or if the allocated type
3975 is not a class type, the allocation function's name is looked
3976 up in the global scope.
3978 we disregard block-scope declarations of "operator new". */
3981 /* Figure out what function is being called. */
3983 complain);
3985 /* If no suitable function could be found, issue an error message
3986 and give up. */
3988 {
3992 }
3994 /* If a cookie is required, add some extra space. Whether
3995 or not a cookie is required cannot be determined until
3996 after we know which function was called. */
3998 {
4001 {
4002 /* In G++ 3.2, the check was implemented incorrectly; it
4003 looked at the placement expression, rather than the
4004 type of the function. */
4008 }
4009 else
4010 {
4011 tree arg_types;
4014 /* Skip the size_t parameter. */
4016 /* Check the remaining parameters (if any). */
4020 ptr_type_node))
4022 }
4023 /* If we need a cookie, adjust the number of bytes allocated. */
4025 {
4026 /* Update the total size. */
4028 /* Set to (size_t)-1 if the size check fails. */
4032 /* Update the argument list to reflect the adjusted size. */
4034 }
4035 else
4037 }
4039 /* Tell our caller which function we decided to call. */
4043 /* Build the CALL_EXPR. */
4045 }
4047 /* Build a new call to operator(). This may change ARGS. */
4049 static tree
4051 {
4065 {
4067 /* It's no good looking for an overloaded operator() on a
4068 pointer-to-member-function. */
4069 error ("pointer-to-member function %E cannot be called without an object; consider using .* or ->*", obj);
4071 }
4074 {
4078 }
4079 else
4083 {
4087 }
4089 /* Get the high-water mark for the CONVERSION_OBSTACK. */
4093 {
4101 }
4106 {
4115 {
4122 add_template_conv_candidate
4126 else
4130 }
4131 }
4135 {
4137 {
4141 }
4143 }
4144 else
4145 {
4148 {
4150 {
4154 }
4156 }
4157 /* Since cand->fn will be a type, not a function, for a conversion
4158 function, we must be careful not to unconditionally look at
4159 DECL_NAME here. */
4163 else
4164 {
4166 complain);
4169 }
4170 }
4172 /* Free all the conversions we allocated. */
4176 }
4178 /* Wrapper for above. */
4180 tree
4182 {
4183 tree ret;
4188 }
4190 /* Called by op_error to prepare format strings suitable for the error
4191 function. It concatenates a prefix (controlled by MATCH), ERRMSG,
4192 and a suffix (controlled by NTYPES). */
4196 {
4206 else
4210 }
4212 static void
4215 {
4220 else
4224 {
4230 else
4242 else
4252 else
4263 else
4273 else
4278 else
4282 else
4287 }
4288 }
4290 /* Return the implicit conversion sequence that could be used to
4291 convert E1 to E2 in [expr.cond]. */
4295 {
4301 /* [expr.cond]
4303 If E2 is an lvalue: E1 can be converted to match E2 if E1 can be
4304 implicitly converted (clause _conv_) to the type "lvalue reference to
4305 T2", subject to the constraint that in the conversion the
4306 reference must bind directly (_dcl.init.ref_) to an lvalue. */
4308 {
4310 t1,
4311 e1,
4313 LOOKUP_NO_TEMP_BIND|LOOKUP_NO_RVAL_BIND
4315 complain);
4318 }
4320 /* [expr.cond]
4322 If E1 and E2 have class type, and the underlying class types are
4323 the same or one is a base class of the other: E1 can be converted
4324 to match E2 if the class of T2 is the same type as, or a base
4325 class of, the class of T1, and the cv-qualification of T2 is the
4326 same cv-qualification as, or a greater cv-qualification than, the
4327 cv-qualification of T1. If the conversion is applied, E1 is
4328 changed to an rvalue of type T2 that still refers to the original
4329 source class object (or the appropriate subobject thereof). */
4332 {
4334 {
4339 else
4342 }
4343 else
4345 }
4346 else
4347 /* [expr.cond]
4349 Otherwise: E1 can be converted to match E2 if E1 can be implicitly
4350 converted to the type that expression E2 would have if E2 were
4351 converted to an rvalue (or the type it has, if E2 is an rvalue). */
4354 }
4356 /* Implement [expr.cond]. ARG1, ARG2, and ARG3 are the three
4357 arguments to the conditional expression. */
4359 static tree
4361 tsubst_flags_t complain)
4362 {
4363 tree arg2_type;
4364 tree arg3_type;
4373 /* As a G++ extension, the second argument to the conditional can be
4374 omitted. (So that `a ? : c' is roughly equivalent to `a ? a :
4375 c'.) If the second operand is omitted, make sure it is
4376 calculated only once. */
4378 {
4383 /* Make sure that lvalues remain lvalues. See g++.oliva/ext1.C. */
4386 else
4388 }
4390 /* If something has already gone wrong, just pass that fact up the
4391 tree. */
4401 {
4412 {
4413 /* Rely on the error messages of the scalar version. */
4422 {
4430 }
4434 /* We could pass complain & tf_warning to unsafe_conversion_p,
4435 but the warnings (like Wsign-conversion) have already been
4436 given by the scalar build_conditional_expr_1. We still check
4437 unsafe_conversion_p to forbid truncating long long -> float. */
4439 {
4444 }
4446 {
4451 }
4461 }
4465 {
4471 {
4475 {
4481 }
4483 {
4489 }
4492 }
4493 }
4499 {
4502 "incompatible vector types in conditional expression: "
4506 }
4512 }
4514 /* [expr.cond]
4516 The first expression is implicitly converted to bool (clause
4517 _conv_). */
4519 LOOKUP_NORMAL);
4523 /* [expr.cond]
4525 If either the second or the third operand has type (possibly
4526 cv-qualified) void, then the lvalue-to-rvalue (_conv.lval_),
4527 array-to-pointer (_conv.array_), and function-to-pointer
4528 (_conv.func_) standard conversions are performed on the second
4529 and third operands. */
4533 {
4534 /* Do the conversions. We don't these for `void' type arguments
4535 since it can't have any effect and since decay_conversion
4536 does not handle that case gracefully. */
4544 /* [expr.cond]
4546 One of the following shall hold:
4548 --The second or the third operand (but not both) is a
4549 throw-expression (_except.throw_); the result is of the
4550 type of the other and is an rvalue.
4552 --Both the second and the third operands have type void; the
4553 result is of type void and is an rvalue.
4555 We must avoid calling force_rvalue for expressions of type
4556 "void" because it will complain that their value is being
4557 used. */
4560 {
4562 {
4566 }
4569 }
4572 {
4574 {
4578 }
4581 }
4584 else
4585 {
4587 {
4590 "second operand to the conditional operator "
4591 "is of type %<void%>, but the third operand is "
4593 else
4595 "third operand to the conditional operator "
4596 "is of type %<void%>, but the second operand is "
4598 }
4600 }
4604 }
4605 /* [expr.cond]
4607 Otherwise, if the second and third operand have different types,
4608 and either has (possibly cv-qualified) class type, an attempt is
4609 made to convert each of those operands to the type of the other. */
4612 {
4616 /* Get the high-water mark for the CONVERSION_OBSTACK. */
4622 /* [expr.cond]
4624 If both can be converted, or one can be converted but the
4625 conversion is ambiguous, the program is ill-formed. If
4626 neither can be converted, the operands are left unchanged and
4627 further checking is performed as described below. If exactly
4628 one conversion is possible, that conversion is applied to the
4629 chosen operand and the converted operand is used in place of
4630 the original operand for the remainder of this section. */
4635 {
4640 }
4642 {
4646 /* Even if CONV2 is a valid conversion, the result of the
4647 conversion may be invalid. For example, if ARG3 has type
4648 "volatile X", and X does not have a copy constructor
4649 accepting a "volatile X&", then even if ARG2 can be
4650 converted to X, the conversion will fail. */
4653 }
4655 {
4661 }
4663 /* Free all the conversions we allocated. */
4669 /* If, after the conversion, both operands have class type,
4670 treat the cv-qualification of both operands as if it were the
4671 union of the cv-qualification of the operands.
4673 The standard is not clear about what to do in this
4674 circumstance. For example, if the first operand has type
4675 "const X" and the second operand has a user-defined
4676 conversion to "volatile X", what is the type of the second
4677 operand after this step? Making it be "const X" (matching
4678 the first operand) seems wrong, as that discards the
4679 qualification without actually performing a copy. Leaving it
4680 as "volatile X" seems wrong as that will result in the
4681 conditional expression failing altogether, even though,
4682 according to this step, the one operand could be converted to
4683 the type of the other. */
4691 }
4693 /* [expr.cond]
4695 If the second and third operands are glvalues of the same value
4696 category and have the same type, the result is of that type and
4697 value category. */
4701 {
4706 }
4708 /* [expr.cond]
4710 Otherwise, the result is an rvalue. If the second and third
4711 operand do not have the same type, and either has (possibly
4712 cv-qualified) class type, overload resolution is used to
4713 determine the conversions (if any) to be applied to the operands
4714 (_over.match.oper_, _over.built_). */
4718 {
4723 /* Rearrange the arguments so that add_builtin_candidate only has
4724 to know about two args. In build_builtin_candidate, the
4725 arguments are unscrambled. */
4730 COND_EXPR,
4731 NOP_EXPR,
4733 args,
4736 /* [expr.cond]
4738 If the overload resolution fails, the program is
4739 ill-formed. */
4742 {
4744 {
4747 }
4749 }
4752 {
4754 {
4757 }
4759 }
4761 /* [expr.cond]
4763 Otherwise, the conversions thus determined are applied, and
4764 the converted operands are used in place of the original
4765 operands for the remainder of this section. */
4774 }
4776 /* [expr.cond]
4778 Lvalue-to-rvalue (_conv.lval_), array-to-pointer (_conv.array_),
4779 and function-to-pointer (_conv.func_) standard conversions are
4780 performed on the second and third operands.
4782 We need to force the lvalue-to-rvalue conversion here for class types,
4783 so we get TARGET_EXPRs; trying to deal with a COND_EXPR of class rvalues
4784 that isn't wrapped with a TARGET_EXPR plays havoc with exception
4785 regions. */
4798 /* [expr.cond]
4800 After those conversions, one of the following shall hold:
4802 --The second and third operands have the same type; the result is of
4803 that type. */
4806 /* [expr.cond]
4808 --The second and third operands have arithmetic or enumeration
4809 type; the usual arithmetic conversions are performed to bring
4810 them to a common type, and the result is of that type. */
4815 {
4816 /* In this case, there is always a common type. */
4818 arg3_type);
4821 "implicit conversion from %qT to %qT to "
4823 loc);
4827 {
4831 /* Two enumerators from the same enumeration can have different
4837 }
4844 {
4848 }
4852 }
4853 /* [expr.cond]
4855 --The second and third operands have pointer type, or one has
4856 pointer type and the other is a null pointer constant; pointer
4857 conversions (_conv.ptr_) and qualification conversions
4858 (_conv.qual_) are performed to bring them to their composite
4859 pointer type (_expr.rel_). The result is of the composite
4860 pointer type.
4862 --The second and third operands have pointer to member type, or
4863 one has pointer to member type and the other is a null pointer
4864 constant; pointer to member conversions (_conv.mem_) and
4865 qualification conversions (_conv.qual_) are performed to bring
4866 them to a common type, whose cv-qualification shall match the
4867 cv-qualification of either the second or the third operand.
4868 The result is of the common type. */
4876 {
4879 complain);
4884 }
4887 {
4892 }
4897 valid_operands:
4900 /* Avoid folding within decltype (c++/42013) and noexcept. */
4903 /* We can't use result_type below, as fold might have returned a
4904 throw_expr. */
4907 {
4908 /* Expand both sides into the same slot, hopefully the target of
4909 the ?: expression. We used to check for TARGET_EXPRs here,
4910 but now we sometimes wrap them in NOP_EXPRs so the test would
4911 fail. */
4914 /* If this expression is an rvalue, but might be mistaken for an
4915 lvalue, we must add a NON_LVALUE_EXPR. */
4917 }
4918 else
4922 }
4924 /* Wrapper for above. */
4926 tree
4928 tsubst_flags_t complain)
4929 {
4930 tree ret;
4935 }
4937 /* OPERAND is an operand to an expression. Perform necessary steps
4938 required before using it. If OPERAND is NULL_TREE, NULL_TREE is
4939 returned. */
4941 static tree
4943 {
4945 {
4948 /* Make sure the template type is instantiated now. */
4950 }
4953 }
4955 /* Add each of the viable functions in FNS (a FUNCTION_DECL or
4956 OVERLOAD) to the CANDIDATES, returning an updated list of
4957 CANDIDATES. The ARGS are the arguments provided to the call;
4958 if FIRST_ARG is non-null it is the implicit object argument,
4959 otherwise the first element of ARGS is used if needed. The
4960 EXPLICIT_TARGS are explicit template arguments provided.
4961 TEMPLATE_ONLY is true if only template functions should be
4962 considered. CONVERSION_PATH, ACCESS_PATH, and FLAGS are as for
4963 add_function_candidate. */
4965 static void
4967 tree return_type,
4972 tsubst_flags_t complain)
4973 {
4974 tree ctype;
4978 unification_kind_t strict;
4979 tree fn;
4984 /* Precalculate special handling of constructors and conversion ops. */
4987 {
4991 /* We're doing return_type(x). */
4993 else
4994 /* We're doing x.operator return_type(). */
4996 /* [over.match.funcs] For conversion functions, the function
4997 is considered to be a member of the class of the implicit
4998 object argument for the purpose of defining the type of
4999 the implicit object parameter. */
5001 }
5002 else
5003 {
5005 {
5007 /* For list-initialization we consider explicit constructors
5008 and complain if one is chosen. */
5009 check_converting
5012 }
5013 else
5014 {
5017 }
5020 }
5024 else
5025 /* Delay creating the implicit this parameter until it is needed. */
5029 {
5030 tree fn_first_arg;
5040 /* Figure out which set of arguments to use. */
5042 {
5043 /* If this function is a non-static member and we didn't get an
5044 implicit object argument, move it out of args. */
5046 {
5048 tree arg;
5055 }
5059 }
5060 else
5061 {
5062 /* Otherwise, just use the list of arguments provided. */
5065 }
5069 fn,
5070 ctype,
5071 explicit_targs,
5072 fn_first_arg,
5073 fn_args,
5074 return_type,
5075 access_path,
5076 conversion_path,
5077 flags,
5078 strict,
5079 complain);
5082 fn,
5083 ctype,
5084 fn_first_arg,
5085 fn_args,
5086 access_path,
5087 conversion_path,
5088 flags,
5089 complain);
5090 }
5091 }
5093 static tree
5096 {
5099 tree fnname;
5117 {
5121 }
5122 else
5128 {
5133 /* Use build_op_new_call and build_op_delete_call instead. */
5137 /* Use build_op_call instead. */
5144 /* These are saved for the sake of warn_logical_operator. */
5150 }
5156 /* Use build_conditional_expr instead. */
5172 /* Get the high-water mark for the CONVERSION_OBSTACK. */
5175 /* Add namespace-scope operators to the list of functions to
5176 consider. */
5186 /* Add class-member operators to the candidate set. */
5188 {
5189 tree fns;
5193 {
5196 }
5204 }
5205 /* Per 13.3.1.2/3, 2nd bullet, if no operand has a class type, then
5206 only non-member functions that have type T1 or reference to
5207 cv-qualified-opt T1 for the first argument, if the first argument
5208 has an enumeration type, or T2 or reference to cv-qualified-opt
5209 T2 for the second argument, if the the second argument has an
5210 enumeration type. Filter out those that don't match. */
5212 {
5216 {
5226 {
5232 && (same_type_ignoring_top_level_qualifiers_p
5237 }
5239 /* No argument has an appropriate type, so remove this
5240 candidate function from the list. */
5242 {
5245 }
5246 }
5247 }
5253 {
5256 /* For these, the built-in candidates set is empty
5257 [over.match.oper]/3. We don't want non-strict matches
5258 because exact matches are always possible with built-in
5259 operators. The built-in candidate set for COMPONENT_REF
5260 would be empty too, but since there are no such built-in
5261 operators, we accept non-strict matches for them. */
5268 }
5272 {
5274 {
5277 /* Don't try anything fancy if we're not allowed to produce
5278 errors. */
5282 /* Look for an `operator++ (int)'. Pre-1985 C++ didn't
5283 distinguish between prefix and postfix ++ and
5284 operator++() was used for both, so we allow this with
5285 -fpermissive. */
5286 else
5287 {
5293 }
5300 else
5306 /* The caller will deal with these. */
5316 {
5317 /* If one of the arguments of the operator represents
5318 an invalid use of member function pointer, try to report
5319 a meaningful error ... */
5324 else
5325 {
5326 /* ... Otherwise, report the more generic
5327 "no matching operator found" error */
5330 }
5331 }
5334 }
5335 }
5336 else
5337 {
5340 {
5342 {
5345 }
5347 }
5349 {
5355 else
5357 }
5358 else
5359 {
5360 /* Give any warnings we noticed during overload resolution. */
5362 {
5366 }
5368 /* Check for comparison of different enum types. */
5370 {
5382 {
5386 }
5390 }
5392 /* We need to strip any leading REF_BIND so that bitfields
5393 don't cause errors. This should not remove any important
5394 conversions, because builtins don't apply to class
5395 objects directly. */
5402 {
5406 else
5409 /* We need to call warn_logical_operator before
5410 converting arg2 to a boolean_type, but after
5411 decaying an enumerator to its value. */
5418 }
5420 {
5425 }
5427 }
5428 }
5430 user_defined_result_ready:
5432 /* Free all the conversions we allocated. */
5438 builtin:
5440 {
5453 /* Fall through. */
5492 complain),
5495 /* The caller will deal with these. */
5503 }
5505 }
5507 /* Wrapper for above. */
5509 tree
5513 {
5514 tree ret;
5520 }
5522 /* Returns true iff T, an element of an OVERLOAD chain, is a usual
5523 deallocation function (3.7.4.2 [basic.stc.dynamic.deallocation]). */
5525 static bool
5527 {
5528 /* A template instance is never a usual deallocation function,
5529 regardless of its signature. */
5534 /* If a class T has a member deallocation function named operator delete
5535 with exactly one parameter, then that function is a usual
5536 (non-placement) deallocation function. If class T does not declare
5537 such an operator delete but does declare a member deallocation
5538 function named operator delete with exactly two parameters, the second
5539 of which has type std::size_t (18.2), then this function is a usual
5540 deallocation function. */
5547 }
5549 /* Build a call to operator delete. This has to be handled very specially,
5550 because the restrictions on what signatures match are different from all
5551 other call instances. For a normal delete, only a delete taking (void *)
5552 or (void *, size_t) is accepted. For a placement delete, only an exact
5553 match with the placement new is accepted.
5555 CODE is either DELETE_EXPR or VEC_DELETE_EXPR.
5556 ADDR is the pointer to be deleted.
5557 SIZE is the size of the memory block to be deleted.
5558 GLOBAL_P is true if the delete-expression should not consider
5559 class-specific delete operators.
5560 PLACEMENT is the corresponding placement new call, or NULL_TREE.
5562 If this call to "operator delete" is being generated as part to
5563 deallocate memory allocated via a new-expression (as per [expr.new]
5564 which requires that if the initialization throws an exception then
5565 we call a deallocation function), then ALLOC_FN is the allocation
5566 function. */
5568 tree
5572 {
5586 /* In [class.free]
5588 If the result of the lookup is ambiguous or inaccessible, or if
5589 the lookup selects a placement deallocation function, the
5590 program is ill-formed.
5592 Therefore, we ask lookup_fnfields to complain about ambiguity. */
5593 {
5597 }
5598 else
5604 /* Strip const and volatile from addr. */
5608 {
5609 /* "A declaration of a placement deallocation function matches the
5610 declaration of a placement allocation function if it has the same
5611 number of parameters and, after parameter transformations (8.3.5),
5612 all parameter types except the first are identical."
5614 So we build up the function type we want and ask instantiate_type
5615 to get it for us. */
5627 /* "If the lookup finds the two-parameter form of a usual deallocation
5628 function (3.7.4.2) and that function, considered as a placement
5629 deallocation function, would have been selected as a match for the
5630 allocation function, the program is ill-formed." */
5632 {
5633 /* But if the class has an operator delete (void *), then that is
5634 the usual deallocation function, so we shouldn't complain
5635 about using the operator delete (void *, size_t). */
5638 {
5643 }
5645 {
5648 }
5649 else
5651 ok:;
5652 }
5653 }
5654 else
5655 /* "Any non-placement deallocation function matches a non-placement
5656 allocation function. If the lookup finds a single matching
5657 deallocation function, that function will be called; otherwise, no
5658 deallocation function will be called." */
5661 {
5664 {
5666 /* "If a class T has a member deallocation function named
5667 operator delete with exactly one parameter, then that
5668 function is a usual (non-placement) deallocation
5669 function. If class T does not declare such an operator
5670 delete but does declare a member deallocation function named
5671 operator delete with exactly two parameters, the second of
5672 which has type std::size_t (18.2), then this function is a
5673 usual deallocation function."
5675 So (void*) beats (void*, size_t). */
5678 }
5679 }
5681 /* If we have a matching function, call it. */
5683 {
5686 /* If the FN is a member function, make sure that it is
5687 accessible. */
5690 complain);
5692 /* Core issue 901: It's ok to new a type with deleted delete. */
5697 {
5698 /* The placement args might not be suitable for overload
5699 resolution at this point, so build the call directly. */
5708 }
5709 else
5710 {
5711 tree ret;
5720 }
5721 }
5723 /* [expr.new]
5725 If no unambiguous matching deallocation function can be found,
5726 propagating the exception does not cause the object's memory to
5727 be freed. */
5729 {
5733 alloc_fn);
5735 }
5741 }
5743 /* If the current scope isn't allowed to access DECL along
5744 BASETYPE_PATH, give an error. The most derived class in
5745 BASETYPE_PATH is the one used to qualify DECL. DIAG_DECL is
5746 the declaration to use in the error diagnostic. */
5748 bool
5750 tsubst_flags_t complain)
5751 {
5755 {
5757 {
5762 else
5765 }
5767 }
5770 }
5772 /* Initialize a temporary of type TYPE with EXPR. The FLAGS are a
5773 bitwise or of LOOKUP_* values. If any errors are warnings are
5774 generated, set *DIAGNOSTIC_FN to "error" or "warning",
5775 respectively. If no diagnostics are generated, set *DIAGNOSTIC_FN
5776 to NULL. */
5778 static tree
5781 {
5794 else
5797 }
5799 /* Perform warnings about peculiar, but valid, conversions from/to NULL.
5800 EXPR is implicitly converted to type TOTYPE.
5801 FN and ARGNUM are used for diagnostics. */
5803 static void
5805 {
5806 /* Issue warnings about peculiar, but valid, uses of NULL. */
5809 {
5810 source_location loc =
5817 else
5820 }
5822 /* Issue warnings if "false" is converted to a NULL pointer */
5825 {
5828 "converting %<false%> to pointer type for argument %P "
5830 else
5833 }
5834 }
5836 /* Perform the conversions in CONVS on the expression EXPR. FN and
5837 ARGNUM are used for diagnostics. ARGNUM is zero based, -1
5838 indicates the `this' argument of a method. INNER is nonzero when
5839 being called to continue a conversion chain. It is negative when a
5840 reference binding will be applied, positive otherwise. If
5841 ISSUE_CONVERSION_WARNINGS is true, warnings about suspicious
5842 conversions will be emitted if appropriate. If C_CAST_P is true,
5843 this conversion is coming from a C-style cast; in that case,
5844 conversions to inaccessible bases are permitted. */
5846 static tree
5850 {
5852 diagnostic_t diag_kind;
5867 {
5870 /* Give a helpful error if this is bad because of excess braces. */
5878 {
5880 {
5887 complain);
5891 complain);
5892 else
5894 }
5896 {
5900 complain);
5902 }
5907 complain);
5910 }
5918 }
5924 {
5926 {
5931 /* When converting from an init list we consider explicit
5932 constructors, but actually trying to call one is an error. */
5934 /* Unless this is for direct-list-initialization. */
5937 {
5940 }
5942 /* If we're initializing from {}, it's value-initialization. */
5946 {
5951 {
5954 }
5956 }
5960 /* Set user_conv_p on the argument conversions, so rvalue/base
5961 handling knows not to allow any more UDCs. */
5967 /* If this is a constructor or a function returning an aggr type,
5968 we need to build up a TARGET_EXPR. */
5970 {
5973 /* Remember that this was list-initialization. */
5976 }
5979 }
5983 {
5989 else
5991 }
5995 /* Convert a constant to its underlying value, unless we are
5996 about to bind it to a reference, in which case we need to
5997 leave it as an lvalue. */
5999 {
6002 /* If __null has been converted to an integer type, we do not
6003 want to warn about uses of EXPR as an integer, rather than
6004 as a pointer. */
6006 }
6009 /* We leave bad_p off ck_ambig because overload resolution considers
6010 it valid, it just fails when we try to perform it. So we need to
6011 check complain here, too. */
6013 {
6014 /* Call build_user_type_conversion again for the error. */
6016 complain);
6020 }
6024 {
6025 /* Conversion to std::initializer_list<T>. */
6033 /* Convert all the elements. */
6035 {
6045 }
6046 /* Build up the array. */
6047 elttype = cp_build_qualified_type
6051 /* Take the address explicitly rather than via decay_conversion
6052 to avoid the error about taking the address of a temporary. */
6056 /* Build up the initializer_list object. */
6064 }
6068 {
6077 }
6080 complain);
6084 };
6089 c_cast_p,
6090 complain);
6095 {
6103 /* Else fall through. */
6106 {
6107 /* We are going to bind a reference directly to a base-class
6108 subobject of EXPR. */
6109 /* Build an expression for `*((base*) &expr)'. */
6115 }
6117 /* Copy-initialization where the cv-unqualified version of the source
6118 type is the same class as, or a derived class of, the class of the
6119 destination [is treated as direct-initialization]. [dcl.init] */
6122 /* This conversion is being done in the context of a user-defined
6123 conversion (i.e. the second step of copy-initialization), so
6124 don't allow any more. */
6130 /* Copy-list-initialization doesn't actually involve a copy. */
6139 {
6143 {
6153 }
6155 /* If necessary, create a temporary.
6157 VA_ARG_EXPR and CONSTRUCTOR expressions are special cases
6158 that need temporaries, even when their types are reference
6159 compatible with the type of reference being bound, so the
6160 upcoming call to cp_build_addr_expr doesn't fail. */
6164 {
6165 /* Otherwise, a temporary of type "cv1 T1" is created and
6166 initialized from the initializer expression using the rules
6167 for a non-reference copy-initialization (8.5). */
6176 {
6177 /* If the reference is volatile or non-const, we
6178 cannot create a temporary. */
6185 else
6189 }
6190 /* If the source is a packed field, and we must use a copy
6191 constructor, then building the target expr will require
6192 binding the field to the reference parameter to the
6193 copy constructor, and we'll end up with an infinite
6194 loop. If we can use a bitwise copy, then we'll be
6195 OK. */
6199 {
6203 }
6205 {
6208 }
6210 }
6212 /* Take the address of the thing to which we will bind the
6213 reference. */
6218 /* Convert it to a pointer to the type referred to by the
6219 reference. This will adjust the pointer if a derived to
6220 base conversion is being performed. */
6223 /* Convert the pointer to the desired reference type. */
6225 }
6231 /* Warn about deprecated conversion if appropriate. */
6247 }
6254 else
6258 }
6260 /* ARG is being passed to a varargs function. Perform any conversions
6261 required. Return the converted value. */
6263 tree
6265 {
6266 tree arg_type;
6269 /* [expr.call]
6271 The lvalue-to-rvalue, array-to-pointer, and function-to-pointer
6272 standard conversions are performed. */
6275 /* [expr.call]
6277 If the argument has integral or enumeration type that is subject
6278 to the integral promotions (_conv.prom_), or a floating point
6279 type that is subject to the floating point promotion
6280 (_conv.fpprom_), the value of the argument is converted to the
6281 promoted type before the call. */
6286 {
6290 "implicit conversion from %qT to %qT when passing "
6294 }
6298 {
6300 {
6305 }
6307 }
6313 /* In a template (or ill-formed code), we can have an incomplete type
6314 even after require_complete_type_sfinae, in which case we don't know
6315 whether it has trivial copy or not. */
6317 {
6318 /* Build up a real lvalue-to-rvalue conversion in case the
6319 copy constructor is trivial but not callable. */
6323 /* [expr.call] 5.2.2/7:
6324 Passing a potentially-evaluated argument of class type (Clause 9)
6325 with a non-trivial copy constructor or a non-trivial destructor
6326 with no corresponding parameter is conditionally-supported, with
6327 implementation-defined semantics.
6329 We used to just warn here and do a bitwise copy, but now
6330 cp_expr_size will abort if we try to do that.
6332 If the call appears in the context of a sizeof expression,
6333 it is not potentially-evaluated. */
6337 {
6341 else
6343 }
6344 }
6347 }
6349 /* va_arg (EXPR, TYPE) is a builtin. Make sure it is not abused. */
6351 tree
6353 {
6367 {
6368 /* Remove reference types so we don't ICE later on. */
6370 /* conditionally-supported behavior [expr.call] 5.2.2/7. */
6376 }
6379 }
6381 /* TYPE has been given to va_arg. Apply the default conversions which
6382 would have happened when passed via ellipsis. Return the promoted
6383 type, or the passed type if there is no change. */
6385 tree
6387 {
6388 tree promote;
6390 /* Perform the array-to-pointer and function-to-pointer
6391 conversions. */
6399 }
6401 /* ARG is a default argument expression being passed to a parameter of
6402 the indicated TYPE, which is a parameter to FN. PARMNUM is the
6403 zero-based argument number. Do any required conversions. Return
6404 the converted value. */
6407 void
6411 void
6415 tree
6417 tsubst_flags_t complain)
6418 {
6420 tree t;
6422 /* See through clones. */
6425 /* Detect recursion. */
6428 {
6432 }
6434 /* If the ARG is an unparsed default argument expression, the
6435 conversion cannot be performed. */
6437 {
6442 }
6449 /* Due to:
6451 [dcl.fct.default]
6453 The names in the expression are bound, and the semantic
6454 constraints are checked, at the point where the default
6455 expressions appears.
6457 we must not perform access checks here. */
6459 /* We must make a copy of ARG, in case subsequent processing
6460 alters any part of it. */
6463 {
6467 complain);
6468 }
6469 else
6470 {
6473 complain);
6475 }
6481 }
6483 /* Returns the type which will really be used for passing an argument of
6484 type TYPE. */
6486 tree
6488 {
6489 /* Pass classes with copy ctors by invisible reference. */
6491 {
6493 /* There are no other pointers to this temporary. */
6495 }
6503 }
6505 /* Actually perform the appropriate conversion. */
6507 tree
6509 {
6510 tree bitfield_type;
6512 /* If VAL is a bitfield, then -- since it has already been converted
6513 to TYPE -- it cannot have a precision greater than TYPE.
6515 If it has a smaller precision, we must widen it here. For
6516 example, passing "int f:3;" to a function expecting an "int" will
6517 not result in any conversion before this point.
6519 If the precision is the same we must not risk widening. For
6520 example, the COMPONENT_REF for a 32-bit "long long" bitfield will
6521 often have type "int", even though the C++ type for the field is
6522 "long long". If the value is being passed to a function
6523 expecting an "int", then no conversions will be required. But,
6524 if we call convert_bitfield_to_declared_type, the bitfield will
6525 be converted to "long long". */
6532 ;
6533 /* Pass classes with copy ctors by invisible reference. */
6543 {
6552 }
6554 }
6556 /* Returns true iff FN is a function with magic varargs, i.e. ones for
6557 which no conversions at all should be done. This is true for some
6558 builtins which don't act like normal functions. */
6560 bool
6562 {
6568 {
6578 }
6581 }
6583 /* Returns the decl of the dispatcher function if FN is a function version. */
6585 tree
6587 {
6597 {
6601 }
6606 }
6608 /* fn is a function version dispatcher that is marked used. Mark all the
6609 semantically identical function versions it will dispatch as used. */
6611 void
6613 {
6630 /* All semantically identical versions are chained. Traverse and mark each
6631 one of them as used. */
6634 {
6637 }
6638 }
6640 /* Subroutine of the various build_*_call functions. Overload resolution
6641 has chosen a winning candidate CAND; build up a CALL_EXPR accordingly.
6642 ARGS is a TREE_LIST of the unconverted arguments to the call. FLAGS is a
6643 bitmask of various LOOKUP_* flags which apply to the call itself. */
6645 static tree
6647 {
6655 tree val;
6664 /* In a template, there is no need to perform all of the work that
6665 is normally done. We are only interested in the type of the call
6666 expression, i.e., the return type of the function. Any semantic
6667 errors will be deferred until the template is instantiated. */
6669 {
6671 tree return_type;
6679 else
6680 {
6683 tree arg;
6691 }
6701 }
6703 /* Give any warnings we noticed during overload resolution. */
6705 {
6709 }
6711 /* Make =delete work with SFINAE. */
6716 {
6717 tree access_fn;
6718 /* If FN is a template function, two cases must be considered.
6719 For example:
6721 struct A {
6722 protected:
6723 template <class T> void f();
6724 };
6725 template <class T> struct B {
6726 protected:
6727 void g();
6728 };
6729 struct C : A, B<int> {
6730 using A::f; // #1
6731 using B<int>::g; // #2
6732 };
6734 In case #1 where `A::f' is a member template, DECL_ACCESS is
6735 recorded in the primary template but not in its specialization.
6736 We check access of FN using its primary template.
6738 In case #2, where `B<int>::g' has a DECL_TEMPLATE_INFO simply
6739 because it is a member of class template B, DECL_ACCESS is
6740 recorded in the specialization `B<int>::g'. We cannot use its
6741 primary template because `B<T>::g' and `B<int>::g' may have
6742 different access. */
6746 else
6751 }
6753 /* If we're checking for implicit delete, don't bother with argument
6754 conversions. */
6756 {
6758 {
6762 }
6766 /* Reject bad conversions now. */
6768 /* else continue to get conversion error. */
6769 }
6771 /* N3276 magic doesn't apply to nested calls. */
6775 /* Find maximum size of vector to hold converted arguments. */
6782 /* The implicit parameters to a constructor are not considered by overload
6783 resolution, and must be of the proper type. */
6785 {
6786 tree object_arg;
6788 {
6791 }
6792 else
6793 {
6796 }
6799 /* We should never try to call the abstract constructor. */
6803 {
6807 }
6808 }
6809 /* Bypass access control for 'this' parameter. */
6811 {
6814 ? first_arg
6817 tree converted_arg;
6818 tree base_binfo;
6821 {
6825 else
6827 }
6829 /* See if the function member or the whole class type is declared
6830 final and the call can be devirtualized. */
6835 /* [class.mfct.nonstatic]: If a nonstatic member function of a class
6836 X is called for an object that is not of type X, or of a type
6837 derived from X, the behavior is undefined.
6839 So we can assume that anything passed as 'this' is non-null, and
6840 optimize accordingly. */
6842 /* Convert to the base in which the function was declared. */
6845 arg,
6848 /* Check that the base class is accessible. */
6851 {
6856 else
6858 }
6859 /* If fn was found by a using declaration, the conversion path
6860 will be to the derived class, not the base declaring fn. We
6861 must convert from derived to base. */
6872 else
6876 }
6881 {
6888 /* If the argument is NULL and used to (implicitly) instantiate a
6889 template function (and bind one of the template arguments to
6890 the type of 'long int'), we don't want to warn about passing NULL
6891 to non-pointer argument.
6892 For example, if we have this template function:
6894 template<typename T> void func(T x) {}
6896 we want to warn (when -Wconversion is enabled) in this case:
6898 void foo() {
6899 func<int>(NULL);
6900 }
6902 but not in this case:
6904 void foo() {
6905 func(NULL);
6906 }
6907 */
6914 /* Warn about initializer_list deduction that isn't currently in the
6915 working draft. */
6917 && flag_deduce_init_list
6921 {
6934 {
6941 }
6942 }
6944 conversion_warning
6945 ? complain
6952 else
6954 }
6956 /* Default arguments */
6958 {
6964 complain);
6965 }
6967 /* Ellipsis */
6969 {
6972 /* Do no conversions for magic varargs. */
6974 else
6977 }
6984 /* Avoid actually calling copy constructors and copy assignment operators,
6985 if possible. */
6992 {
6993 tree targ;
6995 tree fa;
6998 /* Pull out the real argument, disregarding const-correctness. */
7004 {
7009 }
7010 else
7015 else
7018 /* [class.copy]: the copy constructor is implicitly defined even if
7019 the implementation elided its use. */
7021 {
7024 }
7026 /* If we're creating a temp and we already have one, don't create a
7027 new one. If we're not creating a temp but we get one, use
7028 INIT_EXPR to collapse the temp into our target. Otherwise, if the
7029 ctor is trivial, do a bitwise copy with a simple TARGET_EXPR for a
7030 temp or an INIT_EXPR otherwise. */
7033 {
7038 }
7040 {
7042 complain));
7046 }
7047 }
7051 {
7052 tree to = stabilize_reference
7059 {
7060 /* Avoid copying empty classes. */
7065 }
7067 {
7070 }
7071 else
7072 {
7073 /* We must only copy the non-tail padding parts. */
7081 build_index_type
7090 }
7093 }
7098 /* FIXME handle trivial default constructor, too. */
7100 /* For calls to a multi-versioned function, overload resolution
7101 returns the function with the highest target priority, that is,
7102 the version that will checked for dispatching first. If this
7103 version is inlinable, a direct call to this version can be made
7104 otherwise the call should go through the dispatcher. */
7109 {
7115 }
7122 /* Don't mess with virtual lookup in fold_non_dependent_expr; virtual
7123 functions can't be constexpr. */
7125 {
7126 tree t;
7132 /* Warn about deprecated virtual functions now, since we're about
7133 to throw away the decl. */
7138 complain);
7144 else
7147 }
7148 else
7149 {
7153 }
7156 }
7158 /* Build and return a call to FN, using NARGS arguments in ARGARRAY.
7159 This function performs no overload resolution, conversion, or other
7160 high-level operations. */
7162 tree
7164 tsubst_flags_t complain)
7165 {
7166 tree fndecl;
7169 /* Remember roughly where this call is. */
7176 /* Check that arguments to builtin functions match the expectations. */
7183 /* If it is a built-in array notation function, then the return type of
7184 the function is the element type of the array passed in as array
7185 notation (i.e. the first parameter of the function). */
7187 {
7196 {
7197 /* for bif == BUILT_IN_CILKPLUS_SEC_REDUCE_ALL_ZERO or
7198 BUILT_IN_CILKPLUS_SEC_REDUCE_ANY_ZERO or
7199 BUILT_IN_CILKPLUS_SEC_REDUCE_ANY_NONZERO or
7200 BUILT_IN_CILKPLUS_SEC_REDUCE_ALL_NONZERO or
7201 BUILT_IN_CILKPLUS_SEC_REDUCE_MIN_IND or
7202 BUILT_IN_CILKPLUS_SEC_REDUCE_MAX_IND
7203 The pre-defined return-type is the correct one. */
7207 }
7208 }
7210 /* Some built-in function calls will be evaluated at compile-time in
7211 fold (). Set optimize to 1 when folding __builtin_constant_p inside
7212 a constexpr function so that fold_builtin_1 doesn't fold it to 0. */
7215 && current_function_decl
7224 /* 5.2.2/11: If a function call is a prvalue of object type: if the
7225 function call is either the operand of a decltype-specifier or the
7226 right operand of a comma operator that is the operand of a
7227 decltype-specifier, a temporary object is not introduced for the
7228 prvalue. The type of the prvalue may be incomplete. */
7230 {
7237 }
7239 }
7243 /* Make an expression which yields the address of the Java interface
7244 method FN. This is achieved by generating a call to libjava's
7245 _Jv_LookupInterfaceMethodIdx(). */
7247 static tree
7249 {
7255 {
7259 java_iface_lookup_fn
7262 }
7264 /* Look up the pointer to the runtime java.lang.Class object for `instance'.
7265 This is the first entry in the vtable. */
7267 tf_warning_or_error),
7268 integer_zero_node);
7270 /* Get the java.lang.Class pointer for the interface being called. */
7275 {
7277 iface);
7279 }
7283 /* Determine the itable index of FN. */
7286 {
7291 i++;
7292 }
7297 java_iface_lookup_fn);
7300 }
7302 /* Returns the value to use for the in-charge parameter when making a
7303 call to a function with the indicated NAME.
7305 FIXME:Can't we find a neater way to do this mapping? */
7307 tree
7309 {
7320 /* This function should only be called with one of the names listed
7321 above. */
7324 }
7326 /* Build a call to a constructor, destructor, or an assignment
7327 operator for INSTANCE, an expression with class type. NAME
7328 indicates the special member function to call; *ARGS are the
7329 arguments. ARGS may be NULL. This may change ARGS. BINFO
7330 indicates the base of INSTANCE that is to be passed as the `this'
7331 parameter to the member function called.
7333 FLAGS are the LOOKUP_* flags to use when processing the call.
7335 If NAME indicates a complete object constructor, INSTANCE may be
7336 NULL_TREE. In this case, the caller will call build_cplus_new to
7337 store the newly constructed object into a VAR_DECL. */
7339 tree
7342 {
7343 tree fns;
7344 /* The type of the subobject to be constructed or destroyed. */
7345 tree class_type;
7347 tree ret;
7356 {
7357 /* Resolve the name. */
7362 }
7368 /* Handle the special case where INSTANCE is NULL_TREE. */
7370 {
7373 }
7374 else
7375 {
7381 /* Convert to the base class, if necessary. */
7384 {
7386 /* For constructors and destructors, either the base is
7387 non-virtual, or it is virtual but we are doing the
7388 conversion from a constructor or destructor for the
7389 complete object. In either case, we can convert
7390 statically. */
7392 else
7393 /* However, for assignment operators, we must convert
7394 dynamically if the base is virtual. */
7397 }
7398 }
7404 /* When making a call to a constructor or destructor for a subobject
7405 that uses virtual base classes, pass down a pointer to a VTT for
7406 the subobject. */
7410 {
7411 tree vtt;
7412 tree sub_vtt;
7414 /* If the current function is a complete object constructor
7415 or destructor, then we fetch the VTT directly.
7416 Otherwise, we look it up using the VTT we were given. */
7424 current_vtt_parm,
7425 vtt);
7428 else
7432 {
7435 }
7438 }
7443 complain);
7457 }
7459 /* Return the NAME, as a C string. The NAME indicates a function that
7460 is a member of TYPE. *FREE_P is set to true if the caller must
7461 free the memory returned.
7463 Rather than go through all of this, we should simply set the names
7464 of constructors and destructors appropriately, and dispense with
7465 ctor_identifier, dtor_identifier, etc. */
7469 {
7472 /* Assume that we will not allocate memory. */
7474 /* Constructors and destructors are special. */
7476 {
7477 pretty_name
7479 /* For a destructor, add the '~'. */
7483 {
7485 /* Remember that we need to free the memory allocated. */
7487 }
7488 }
7490 {
7493 TFF_PLAIN_IDENTIFIER),
7494 NULL);
7495 /* Remember that we need to free the memory allocated. */
7497 }
7498 else
7502 }
7504 /* Build a call to "INSTANCE.FN (ARGS)". If FN_P is non-NULL, it will
7505 be set, upon return, to the function called. ARGS may be NULL.
7506 This may change ARGS. */
7508 static tree
7512 {
7517 tree optype;
7519 tree name;
7522 tree call;
7523 tree fn;
7526 tree orig_instance;
7527 tree orig_fns;
7533 /* We don't know what function we're going to call, yet. */
7542 {
7546 }
7551 /* Dismantle the baselink to collect all the information we need. */
7559 {
7563 }
7574 {
7579 }
7582 /* Under DR 147 A::A() is an invalid constructor call,
7583 not a functional cast. */
7585 {
7595 complain);
7597 }
7599 /* Figure out whether to skip the first argument for the error
7600 message we will display to users if an error occurs. We don't
7601 want to display any compiler-generated arguments. The "this"
7602 pointer hasn't been added yet. However, we must remove the VTT
7603 pointer if this is a call to a base-class constructor or
7604 destructor. */
7607 {
7608 /* Callers should explicitly indicate whether they want to construct
7609 the complete object or just the part without virtual bases. */
7611 /* Similarly for destructors. */
7613 /* Remove the VTT pointer, if present. */
7617 }
7619 /* Process the argument list. */
7621 {
7625 }
7627 /* Consider the object argument to be used even if we end up selecting a
7628 static member function. */
7631 /* It's OK to call destructors and constructors on cv-qualified objects.
7632 Therefore, convert the INSTANCE to the unqualified type, if
7633 necessary. */
7636 {
7638 {
7642 }
7643 }
7649 /* Get the high-water mark for the CONVERSION_OBSTACK. */
7652 /* If CONSTRUCTOR_IS_DIRECT_INIT is set, this was a T{ } form
7653 initializer, not T({ }). */
7657 {
7664 /* If the initializer list has no elements and T is a class type with
7665 a default constructor, the object is value-initialized. Handle
7666 this here so we don't need to handle it wherever we use
7667 build_special_member_call. */
7670 /* For a user-provided default constructor, use the normal
7671 mechanisms so that protected access works. */
7676 /* If BASETYPE is an aggregate, we need to do aggregate
7677 initialization. */
7682 {
7689 }
7691 /* Otherwise go ahead with overload resolution. */
7696 }
7697 else
7698 {
7702 }
7707 {
7709 {
7716 else
7717 {
7720 tree arglist;
7731 }
7733 }
7735 }
7736 else
7737 {
7740 {
7743 tree arglist;
7746 {
7752 arglist);
7756 }
7758 }
7759 else
7760 {
7770 /* This is not an error, it is runtime undefined
7771 behavior. */
7773 "pure virtual %q#D called from constructor"
7775 fn);
7779 {
7784 {
7785 /* We captured 'this' in the current lambda now that
7786 we know we really need it. */
7788 }
7789 else
7790 {
7793 fn);
7795 }
7796 }
7799 {
7800 /* Optimize away vtable lookup if we know that this
7801 function can't be overridden. We need to check if
7802 the context and the type where we found fn are the same,
7803 actually FN might be defined in a different class
7804 type because of a using-declaration. In this case, we
7805 do not want to perform a non-virtual call. */
7807 && same_type_ignoring_top_level_qualifiers_p
7813 /* Now we know what function is being called. */
7816 /* Build the actual CALL_EXPR. */
7818 /* In an expression of the form `a->f()' where `f' turns
7819 out to be a static member function, `a' is
7820 none-the-less evaluated. */
7829 /* An explicit call of the form "x->~X()" has type
7830 "void". However, on platforms where destructors
7831 return "this" (i.e., those where
7832 targetm.cxx.cdtor_returns_this is true), such calls
7833 will appear to have a return value of pointer type
7834 to the low-level call machinery. We do not want to
7835 change the low-level machinery, since we want to be
7836 able to optimize "delete f()" on such platforms as
7837 "operator delete(~X(f()))" (rather than generating
7838 "t = f(), ~X(t), operator delete (t)"). */
7840 }
7841 }
7842 }
7845 {
7851 {
7854 }
7857 call = (build_min_non_dep_call_vec
7861 orig_args));
7866 }
7868 /* Free all the conversions we allocated. */
7875 }
7877 /* Wrapper for above. */
7879 tree
7883 {
7884 tree ret;
7890 }
7892 /* Returns true iff standard conversion sequence ICS1 is a proper
7893 subsequence of ICS2. */
7895 static bool
7897 {
7898 /* We can assume that a conversion of the same code
7899 between the same types indicates a subsequence since we only get
7900 here if the types we are converting from are the same. */
7907 {
7917 /* At this point, ICS1 cannot be a proper subsequence of
7918 ICS2. We can get a USER_CONV when we are comparing the
7919 second standard conversion sequence of two user conversion
7920 sequences. */
7930 }
7931 }
7933 /* Returns nonzero iff DERIVED is derived from BASE. The inputs may
7934 be any _TYPE nodes. */
7936 bool
7938 {
7942 /* We only allow proper derivation here. The DERIVED_FROM_P macro
7943 considers every class derived from itself. */
7946 }
7948 /* We build the ICS for an implicit object parameter as a pointer
7949 conversion sequence. However, such a sequence should be compared
7950 as if it were a reference conversion sequence. If ICS is the
7951 implicit conversion sequence for an implicit object parameter,
7952 modify it accordingly. */
7954 static void
7956 {
7958 {
7959 /* [over.match.funcs]
7961 For non-static member functions, the type of the
7962 implicit object parameter is "reference to cv X"
7963 where X is the class of which the function is a
7964 member and cv is the cv-qualification on the member
7965 function declaration. */
7967 tree reference_type;
7969 /* The `this' parameter is a pointer to a class type. Make the
7970 implicit conversion talk about a reference to that same class
7971 type. */
7984 }
7985 }
7987 /* If *ICS is a REF_BIND set *ICS to the remainder of the conversion,
7988 and return the initial reference binding conversion. Otherwise,
7989 leave *ICS unchanged and return NULL. */
7993 {
7995 {
8000 }
8003 }
8005 /* Compare two implicit conversion sequences according to the rules set out in
8006 [over.ics.rank]. Return values:
8008 1: ics1 is better than ics2
8009 -1: ics2 is better than ics1
8010 0: ics1 and ics2 are indistinguishable */
8012 static int
8014 {
8015 tree from_type1;
8016 tree from_type2;
8017 tree to_type1;
8018 tree to_type2;
8025 /* REF_BINDING is nonzero if the result of the conversion sequence
8026 is a reference type. In that case REF_CONV is the reference
8027 binding conversion. */
8031 /* Handle implicit object parameters. */
8035 /* Handle reference parameters. */
8039 /* List-initialization sequence L1 is a better conversion sequence than
8040 list-initialization sequence L2 if L1 converts to
8041 std::initializer_list<X> for some X and L2 does not. */
8047 /* [over.ics.rank]
8049 When comparing the basic forms of implicit conversion sequences (as
8050 defined in _over.best.ics_)
8052 --a standard conversion sequence (_over.ics.scs_) is a better
8053 conversion sequence than a user-defined conversion sequence
8054 or an ellipsis conversion sequence, and
8056 --a user-defined conversion sequence (_over.ics.user_) is a
8057 better conversion sequence than an ellipsis conversion sequence
8058 (_over.ics.ellipsis_). */
8068 {
8069 /* Both ICS are bad. We try to make a decision based on what would
8070 have happened if they'd been good. This is not an extension,
8071 we'll still give an error when we build up the call; this just
8072 helps us give a more helpful error message. */
8081 /* We couldn't make up our minds; try to figure it out below. */
8082 }
8085 /* Both conversions are ellipsis conversions. */
8088 /* User-defined conversion sequence U1 is a better conversion sequence
8089 than another user-defined conversion sequence U2 if they contain the
8090 same user-defined conversion operator or constructor and if the sec-
8091 ond standard conversion sequence of U1 is better than the second
8092 standard conversion sequence of U2. */
8094 /* Handle list-conversion with the same code even though it isn't always
8095 ranked as a user-defined conversion and it doesn't have a second
8096 standard conversion sequence; it will still have the desired effect.
8097 Specifically, we need to do the reference binding comparison at the
8098 end of this function. */
8101 {
8117 {
8120 }
8121 else
8122 {
8123 /* For ambiguous or aggregate conversions, use the target type as
8124 a proxy for the conversion function. */
8127 }
8129 /* We can just fall through here, after setting up
8130 FROM_TYPE1 and FROM_TYPE2. */
8133 }
8134 else
8135 {
8139 /* We're dealing with two standard conversion sequences.
8141 [over.ics.rank]
8143 Standard conversion sequence S1 is a better conversion
8144 sequence than standard conversion sequence S2 if
8146 --S1 is a proper subsequence of S2 (comparing the conversion
8147 sequences in the canonical form defined by _over.ics.scs_,
8148 excluding any Lvalue Transformation; the identity
8149 conversion sequence is considered to be a subsequence of
8150 any non-identity conversion sequence */
8161 }
8163 /* One sequence can only be a subsequence of the other if they start with
8164 the same type. They can start with different types when comparing the
8165 second standard conversion sequence in two user-defined conversion
8166 sequences. */
8168 {
8173 }
8175 /* [over.ics.rank]
8177 Or, if not that,
8179 --the rank of S1 is better than the rank of S2 (by the rules
8180 defined below):
8182 Standard conversion sequences are ordered by their ranks: an Exact
8183 Match is a better conversion than a Promotion, which is a better
8184 conversion than a Conversion.
8186 Two conversion sequences with the same rank are indistinguishable
8187 unless one of the following rules applies:
8189 --A conversion that does not a convert a pointer, pointer to member,
8190 or std::nullptr_t to bool is better than one that does.
8192 The ICS_STD_RANK automatically handles the pointer-to-bool rule,
8193 so that we do not have to check it explicitly. */
8202 /* A conversion from scalar arithmetic type to complex is worse than a
8203 conversion between scalar arithmetic types. */
8210 {
8213 else
8215 }
8221 {
8226 }
8227 /* The rules for pointers to members A::* are just like the rules
8228 for pointers A*, except opposite: if B is derived from A then
8229 A::* converts to B::*, not vice versa. For that reason, we
8230 switch the from_ and to_ variables here. */
8237 {
8242 }
8247 {
8248 /* This was one of the pointer or pointer-like conversions.
8250 [over.ics.rank]
8252 --If class B is derived directly or indirectly from class A,
8253 conversion of B* to A* is better than conversion of B* to
8254 void*, and conversion of A* to void* is better than
8255 conversion of B* to void*. */
8258 {
8260 deref_from_type2))
8263 deref_from_type1))
8265 }
8268 {
8270 {
8272 {
8274 deref_to_type1))
8276 }
8277 /* We know that DEREF_TO_TYPE1 is `void' here. */
8279 deref_to_type2))
8281 }
8282 }
8285 {
8286 /* [over.ics.rank]
8288 --If class B is derived directly or indirectly from class A
8289 and class C is derived directly or indirectly from B,
8291 --conversion of C* to B* is better than conversion of C* to
8292 A*,
8294 --conversion of B* to A* is better than conversion of C* to
8295 A* */
8297 {
8299 deref_to_type2))
8302 deref_to_type1))
8304 }
8306 {
8308 deref_from_type1))
8311 deref_from_type2))
8313 }
8314 }
8315 }
8318 {
8321 /* [over.ics.rank]
8323 --binding of an expression of type C to a reference of type
8324 B& is better than binding an expression of type C to a
8325 reference of type A&
8327 --conversion of C to B is better than conversion of C to A, */
8330 {
8335 }
8336 }
8339 {
8342 /* [over.ics.rank]
8344 --binding of an expression of type B to a reference of type
8345 A& is better than binding an expression of type C to a
8346 reference of type A&,
8348 --conversion of B to A is better than conversion of C to A */
8351 {
8356 }
8357 }
8359 /* [over.ics.rank]
8361 --S1 and S2 differ only in their qualification conversion and yield
8362 similar types T1 and T2 (_conv.qual_), respectively, and the cv-
8363 qualification signature of type T1 is a proper subset of the cv-
8364 qualification signature of type T2 */
8368 {
8372 }
8374 /* [over.ics.rank]
8376 --S1 and S2 are reference bindings (_dcl.init.ref_) and neither refers
8377 to an implicit object parameter, and either S1 binds an lvalue reference
8378 to an lvalue and S2 binds an rvalue reference or S1 binds an rvalue
8379 reference to an rvalue and S2 binds an lvalue reference
8380 (C++0x draft standard, 13.3.3.2)
8382 --S1 and S2 are reference bindings (_dcl.init.ref_), and the
8383 types to which the references refer are the same type except for
8384 top-level cv-qualifiers, and the type to which the reference
8385 initialized by S2 refers is more cv-qualified than the type to
8386 which the reference initialized by S1 refers.
8388 DR 1328 [over.match.best]: the context is an initialization by
8389 conversion function for direct reference binding (13.3.1.6) of a
8390 reference to function type, the return type of F1 is the same kind of
8391 reference (i.e. lvalue or rvalue) as the reference being initialized,
8392 and the return type of F2 is not. */
8395 {
8402 {
8405 }
8410 }
8412 /* Neither conversion sequence is better than the other. */
8414 }
8416 /* The source type for this standard conversion sequence. */
8418 static tree
8420 {
8422 {
8427 }
8429 }
8431 /* Note a warning about preferring WINNER to LOSER. We do this by storing
8432 a pointer to LOSER and re-running joust to produce the warning if WINNER
8433 is actually used. */
8435 static void
8437 {
8443 }
8445 /* Compare two candidates for overloading as described in
8446 [over.match.best]. Return values:
8448 1: cand1 is better than cand2
8449 -1: cand2 is better than cand1
8450 0: cand1 and cand2 are indistinguishable */
8452 static int
8454 tsubst_flags_t complain)
8455 {
8461 /* Candidates that involve bad conversions are always worse than those
8462 that don't. */
8468 /* If we have two pseudo-candidates for conversions to the same type,
8469 or two candidates for the same function, arbitrarily pick one. */
8474 /* Prefer a non-deleted function over an implicitly deleted move
8475 constructor or assignment operator. This differs slightly from the
8476 wording for issue 1402 (which says the move op is ignored by overload
8477 resolution), but this way produces better error messages. */
8481 {
8488 }
8490 /* a viable function F1
8491 is defined to be a better function than another viable function F2 if
8492 for all arguments i, ICSi(F1) is not a worse conversion sequence than
8493 ICSi(F2), and then */
8495 /* for some argument j, ICSj(F1) is a better conversion sequence than
8496 ICSj(F2) */
8498 /* For comparing static and non-static member functions, we ignore
8499 the implicit object parameter of the non-static function. The
8500 standard says to pretend that the static function has an object
8501 parm, but that won't work with operator overloading. */
8504 {
8510 /* We're comparing a near-match list constructor and a near-match
8511 non-list constructor. Just treat them as unordered. */
8518 else
8519 {
8522 }
8523 }
8526 {
8532 {
8534 && warn_sign_promo
8546 {
8553 else
8558 {
8562 }
8563 else
8565 }
8568 {
8571 }
8573 }
8574 }
8576 /* warn about confusing overload resolution for user-defined conversions,
8577 either between a constructor and a conversion op, or between two
8578 conversion ops. */
8583 {
8589 else
8592 /* We don't want to complain about `X::operator T1 ()'
8593 beating `X::operator T2 () const', when T2 is a no less
8594 cv-qualified version of T1. */
8597 {
8602 {
8605 }
8608 }
8609 else
8615 {
8622 {
8624 }
8625 }
8626 else
8628 }
8633 /* DR 495 moved this tiebreaker above the template ones. */
8634 /* or, if not that,
8635 the context is an initialization by user-defined conversion (see
8636 _dcl.init_ and _over.match.user_) and the standard conversion
8637 sequence from the return type of F1 to the destination type (i.e.,
8638 the type of the entity being initialized) is a better conversion
8639 sequence than the standard conversion sequence from the return type
8640 of F2 to the destination type. */
8643 {
8647 }
8649 /* or, if not that,
8650 F1 is a non-template function and F2 is a template function
8651 specialization. */
8658 /* or, if not that,
8659 F1 and F2 are template functions and the function template for F1 is
8660 more specialized than the template for F2 according to the partial
8661 ordering rules. */
8664 {
8665 winner = more_specialized_fn
8668 /* [temp.func.order]: The presence of unused ellipsis and default
8669 arguments has no effect on the partial ordering of function
8670 templates. add_function_candidate() will not have
8671 counted the "this" argument for constructors. */
8675 }
8677 /* Check whether we can discard a builtin candidate, either because we
8678 have two identical ones or matching builtin and non-builtin candidates.
8680 (Pedantically in the latter case the builtin which matched the user
8681 function should not be added to the overload set, but we spot it here.
8683 [over.match.oper]
8684 ... the builtin candidates include ...
8685 - do not have the same parameter type list as any non-template
8686 non-member candidate. */
8689 {
8695 {
8697 /* Two built-in candidates; arbitrarily pick one. */
8700 /* cand1 is built-in; prefer cand2. */
8702 else
8703 /* cand2 is built-in; prefer cand1. */
8705 }
8706 }
8708 /* For candidates of a multi-versioned function, make the version with
8709 the highest priority win. This version will be checked for dispatching
8710 first. If this version can be inlined into the caller, the front-end
8711 will simply make a direct call to this function. */
8717 {
8723 /* Check if cand1->fn and cand2->fn are versions of the same function. It
8724 is possible that cand1->fn and cand2->fn are function versions but of
8725 different functions. Check types to see if they are versions of the same
8726 function. */
8729 {
8730 /* Always make the version with the higher priority, more
8731 specialized, win. */
8735 else
8737 }
8738 }
8740 /* If the two function declarations represent the same function (this can
8741 happen with declarations in multiple scopes and arg-dependent lookup),
8742 arbitrarily choose one. But first make sure the default args we're
8743 using match. */
8746 {
8753 {
8754 /* Don't crash if the fn is variadic. */
8759 }
8767 {
8770 {
8772 {
8774 {
8776 "default argument mismatch in "
8778 {
8783 }
8784 }
8785 else
8787 }
8788 else
8791 }
8794 }
8797 }
8799 tweak:
8801 /* Extension: If the worst conversion for one candidate is worse than the
8802 worst conversion for the other, take the first. */
8804 {
8809 {
8814 }
8820 {
8821 /* Don't choose a deleted function over ambiguity. */
8825 {
8827 "ISO C++ says that these are ambiguous, even "
8828 "though the worst conversion for the first is better than "
8832 }
8833 else
8836 }
8837 }
8841 }
8843 /* Given a list of candidates for overloading, find the best one, if any.
8844 This algorithm has a worst case of O(2n) (winner is last), and a best
8845 case of O(n/2) (totally ambiguous); much better than a sorting
8846 algorithm. */
8850 {
8855 /* Walk through the list once, comparing each current champ to the next
8856 candidate, knocking out a candidate or two with each comparison. */
8859 {
8863 else
8864 {
8866 {
8871 }
8872 else
8873 {
8876 }
8879 }
8880 }
8882 /* Make sure the champ is better than all the candidates it hasn't yet
8883 been compared to. */
8886 challenger != champ
8889 {
8893 }
8896 }
8898 /* Returns nonzero if things of type FROM can be converted to TO. */
8900 bool
8902 {
8904 /* implicit_conversion only considers user-defined conversions
8905 if it has an expression for the call argument list. */
8909 }
8911 /* Returns nonzero if things of type FROM can be converted to TO with a
8912 standard conversion. */
8914 bool
8916 {
8918 }
8920 /* Returns nonzero if ARG (of type FROM) can be converted to TO. */
8922 bool
8924 tsubst_flags_t complain)
8925 {
8930 /* Get the high-water mark for the CONVERSION_OBSTACK. */
8932 /* We want to discard any access checks done for this test,
8933 as we might not be in the appropriate access context and
8934 we'll do the check again when we actually perform the
8935 conversion. */
8942 /* Discard the access checks now. */
8944 /* Free all the conversions we allocated. */
8948 }
8950 /* Like can_convert_arg, but allows dubious conversions as well. */
8952 bool
8954 tsubst_flags_t complain)
8955 {
8959 /* Get the high-water mark for the CONVERSION_OBSTACK. */
8961 /* Try to perform the conversion. */
8964 /* Free all the conversions we allocated. */
8968 }
8970 /* Convert EXPR to TYPE. Return the converted expression.
8972 Note that we allow bad conversions here because by the time we get to
8973 this point we are committed to doing the conversion. If we end up
8974 doing a bad conversion, convert_like will complain. */
8976 tree
8979 {
8987 /* Get the high-water mark for the CONVERSION_OBSTACK. */
8995 {
8997 {
8998 /* If expr has unknown type, then it is an overloaded function.
8999 Call instantiate_type to get good error messages. */
9004 else
9007 }
9009 }
9011 {
9012 /* In a template, we are only concerned about determining the
9013 type of non-dependent expressions, so we do not have to
9014 perform the actual conversion. But for initializers, we
9015 need to be able to perform it at instantiation
9016 (or fold_non_dependent_expr) time. */
9020 }
9021 else
9024 /* Free all the conversions we allocated. */
9028 }
9030 tree
9032 {
9034 LOOKUP_IMPLICIT);
9035 }
9037 /* Convert EXPR to TYPE (as a direct-initialization) if that is
9038 permitted. If the conversion is valid, the converted expression is
9039 returned. Otherwise, NULL_TREE is returned, except in the case
9040 that TYPE is a class type; in that case, an error is issued. If
9041 C_CAST_P is true, then this direct-initialization is taking
9042 place as part of a static_cast being attempted as part of a C-style
9043 cast. */
9045 tree
9047 tree expr,
9049 tsubst_flags_t complain)
9050 {
9056 /* [dcl.init]
9058 If the destination type is a (possibly cv-qualified) class type:
9060 -- If the initialization is direct-initialization ...,
9061 constructors are considered. ... If no constructor applies, or
9062 the overload resolution is ambiguous, the initialization is
9063 ill-formed. */
9065 {
9071 }
9073 /* Get the high-water mark for the CONVERSION_OBSTACK. */
9077 c_cast_p,
9081 else
9084 c_cast_p,
9085 complain);
9087 /* Free all the conversions we allocated. */
9091 }
9093 /* When initializing a reference that lasts longer than a full-expression,
9094 this special rule applies:
9096 [class.temporary]
9098 The temporary to which the reference is bound or the temporary
9099 that is the complete object to which the reference is bound
9100 persists for the lifetime of the reference.
9102 The temporaries created during the evaluation of the expression
9103 initializing the reference, except the temporary to which the
9104 reference is bound, are destroyed at the end of the
9105 full-expression in which they are created.
9107 In that case, we store the converted expression into a new
9108 VAR_DECL in a new scope.
9110 However, we want to be careful not to create temporaries when
9111 they are not required. For example, given:
9113 struct B {};
9114 struct D : public B {};
9115 D f();
9116 const B& b = f();
9118 there is no need to copy the return value from "f"; we can just
9119 extend its lifetime. Similarly, given:
9121 struct S {};
9122 struct T { operator S(); };
9123 T t;
9124 const S& s = t;
9126 we can extend the lifetime of the return value of the conversion
9127 operator.
9129 The next several functions are involved in this lifetime extension. */
9131 /* DECL is a VAR_DECL or FIELD_DECL whose type is a REFERENCE_TYPE. The
9132 reference is being bound to a temporary. Create and return a new
9133 VAR_DECL with the indicated TYPE; this variable will store the value to
9134 which the reference is bound. */
9136 tree
9138 {
9139 tree var;
9141 /* Create the variable. */
9144 /* Register the variable. */
9147 {
9148 /* Namespace-scope or local static; give it a mangled name. */
9149 /* FIXME share comdat with decl? */
9150 tree name;
9158 }
9159 else
9160 /* Create a new cleanup level if necessary. */
9164 }
9166 /* EXPR is the initializer for a variable DECL of reference or
9167 std::initializer_list type. Create, push and return a new VAR_DECL
9168 for the initializer so that it will live as long as DECL. Any
9169 cleanup for the new variable is returned through CLEANUP, and the
9170 code to initialize the new variable is returned through INITP. */
9172 static tree
9175 {
9176 tree init;
9177 tree type;
9178 tree var;
9180 /* Create the temporary variable. */
9184 /* If the rvalue is the result of a function call it will be
9185 a TARGET_EXPR. If it is some other construct (such as a
9186 member access expression where the underlying object is
9187 itself the result of a function call), turn it into a
9188 TARGET_EXPR here. It is important that EXPR be a
9189 TARGET_EXPR below since otherwise the INIT_EXPR will
9190 attempt to make a bitwise copy of EXPR to initialize
9191 VAR. */
9197 {
9201 }
9203 /* Recursively extend temps in this initializer. */
9207 /* Any reference temp has a non-trivial initializer. */
9210 /* If the initializer is constant, put it in DECL_INITIAL so we get
9211 static initialization and use in constant expressions. */
9214 {
9216 {
9217 /* 5.19 says that a constant expression can include an
9218 lvalue-rvalue conversion applied to "a glvalue of literal type
9219 that refers to a non-volatile temporary object initialized
9220 with a constant expression". Rather than try to communicate
9221 that this VAR_DECL is a temporary, just mark it constexpr.
9223 Currently this is only useful for initializer_list temporaries,
9224 since reference vars can't appear in constant expressions. */
9228 }
9231 }
9232 else
9233 /* Create the INIT_EXPR that will initialize the temporary
9234 variable. */
9237 {
9242 else
9243 {
9247 }
9249 /* We must be careful to destroy the temporary only
9250 after its initialization has taken place. If the
9251 initialization throws an exception, then the
9252 destructor should not be run. We cannot simply
9253 transform INIT into something like:
9255 (INIT, ({ CLEANUP_STMT; }))
9257 because emit_local_var always treats the
9258 initializer as a full-expression. Thus, the
9259 destructor would run too early; it would run at the
9260 end of initializing the reference variable, rather
9261 than at the end of the block enclosing the
9262 reference variable.
9264 The solution is to pass back a cleanup expression
9265 which the caller is responsible for attaching to
9266 the statement tree. */
9267 }
9268 else
9269 {
9272 {
9275 tls_aggregates);
9276 else
9278 static_aggregates);
9279 }
9280 else
9281 /* Check whether the dtor is callable. */
9283 }
9287 }
9289 /* Convert EXPR to the indicated reference TYPE, in a way suitable for
9290 initializing a variable of that TYPE. */
9292 tree
9295 {
9303 /* Get the high-water mark for the CONVERSION_OBSTACK. */
9309 {
9311 {
9320 else
9324 }
9326 }
9329 /* Perform the conversion. */
9332 /* We gave an error in build_user_type_conversion_1. */
9334 else
9337 /* Free all the conversions we allocated. */
9341 }
9343 /* Subroutine of extend_ref_init_temps. Possibly extend one initializer,
9344 which is bound either to a reference or a std::initializer_list. */
9346 static tree
9348 {
9353 {
9357 }
9360 /* Deal with binding to a subobject. */
9364 {
9370 }
9372 }
9374 /* INIT is part of the initializer for DECL. If there are any
9375 reference or initializer lists being initialized, extend their
9376 lifetime to match that of DECL. */
9378 tree
9380 {
9387 {
9388 /* The temporary array underlying a std::initializer_list
9389 is handled like a reference temporary. */
9394 {
9398 }
9399 }
9401 {
9407 }
9410 }
9412 /* Returns true iff an initializer for TYPE could contain temporaries that
9413 need to be extended because they are bound to references or
9414 std::initializer_list. */
9416 bool
9418 {
9423 {
9430 }
9432 }
9434 /* Returns true iff TYPE is some variant of std::initializer_list. */
9436 bool
9438 {
9439 /* Look through typedefs. */
9448 }
9450 /* Returns true iff DECL is a list constructor: i.e. a constructor which
9451 will accept an argument list of a single std::initializer_list<T>. */
9453 bool
9455 {
9457 tree arg;
9469 /* There are more non-defaulted parms. */
9473 }