1 /* Build expressions with type checking for C++ compiler.
2 Copyright (C) 1987, 88, 89, 92-97, 1998 Free Software Foundation, Inc.
3 Hacked by Michael Tiemann (tiemann@cygnus.com)
5 This file is part of GNU CC.
7 GNU CC is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2, or (at your option)
12 GNU CC is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with GNU CC; see the file COPYING. If not, write to
19 the Free Software Foundation, 59 Temple Place - Suite 330,
20 Boston, MA 02111-1307, USA. */
23 /* This file is part of the C++ front end.
24 It contains routines to build C++ expressions given their operands,
25 including computing the types of the result, C and C++ specific error
26 checks, and some optimization.
28 There are also routines to build RETURN_STMT nodes and CASE_STMT nodes,
29 and to process initializations in declarations (since they work
30 like a strange sort of assignment). */
42 extern void compiler_error ();
44 static tree convert_for_assignment
PROTO((tree
, tree
, char*, tree
,
46 static tree pointer_int_sum
PROTO((enum tree_code
, tree
, tree
));
47 static tree rationalize_conditional_expr
PROTO((enum tree_code
, tree
));
48 static int comp_target_parms
PROTO((tree
, tree
, int));
49 static int comp_ptr_ttypes_real
PROTO((tree
, tree
, int));
50 static int comp_ptr_ttypes_const
PROTO((tree
, tree
));
51 static int comp_ptr_ttypes_reinterpret
PROTO((tree
, tree
));
52 static int comp_array_types
PROTO((int (*) (tree
, tree
, int), tree
,
54 static tree build_ptrmemfunc1
PROTO((tree
, tree
, tree
, tree
, tree
));
55 static tree common_base_type
PROTO((tree
, tree
));
57 static tree convert_sequence
PROTO((tree
, tree
));
59 static tree lookup_anon_field
PROTO((tree
, tree
));
60 static tree pointer_diff
PROTO((tree
, tree
, tree
));
61 static tree qualify_type
PROTO((tree
, tree
));
62 static tree get_delta_difference
PROTO((tree
, tree
, int));
64 /* Return the target type of TYPE, which meas return T for:
65 T*, T&, T[], T (...), and otherwise, just T. */
71 if (TREE_CODE (type
) == REFERENCE_TYPE
)
72 type
= TREE_TYPE (type
);
73 while (TREE_CODE (type
) == POINTER_TYPE
74 || TREE_CODE (type
) == ARRAY_TYPE
75 || TREE_CODE (type
) == FUNCTION_TYPE
76 || TREE_CODE (type
) == METHOD_TYPE
77 || TREE_CODE (type
) == OFFSET_TYPE
)
78 type
= TREE_TYPE (type
);
82 /* Do `exp = require_complete_type (exp);' to make sure exp
83 does not have an incomplete type. (That includes void types.) */
86 require_complete_type (value
)
91 if (processing_template_decl
)
94 if (TREE_CODE (value
) == OVERLOAD
)
95 type
= unknown_type_node
;
97 type
= TREE_TYPE (value
);
99 /* First, detect a valid value with a complete type. */
100 if (TYPE_SIZE (type
) != 0
101 && type
!= void_type_node
102 && ! (TYPE_LANG_SPECIFIC (type
)
103 && (IS_SIGNATURE_POINTER (type
) || IS_SIGNATURE_REFERENCE (type
))
104 && TYPE_SIZE (SIGNATURE_TYPE (type
)) == 0))
107 /* If we see X::Y, we build an OFFSET_TYPE which has
108 not been laid out. Try to avoid an error by interpreting
109 it as this->X::Y, if reasonable. */
110 if (TREE_CODE (value
) == OFFSET_REF
111 && current_class_ref
!= 0
112 && TREE_OPERAND (value
, 0) == current_class_ref
)
114 tree base
, member
= TREE_OPERAND (value
, 1);
115 tree basetype
= TYPE_OFFSET_BASETYPE (type
);
116 my_friendly_assert (TREE_CODE (member
) == FIELD_DECL
, 305);
117 base
= convert_pointer_to (basetype
, current_class_ptr
);
118 value
= build (COMPONENT_REF
, TREE_TYPE (member
),
119 build_indirect_ref (base
, NULL_PTR
), member
);
120 return require_complete_type (value
);
123 if (TYPE_SIZE (complete_type (type
)))
127 incomplete_type_error (value
, type
);
128 return error_mark_node
;
132 /* Try to complete TYPE, if it is incomplete. For example, if TYPE is
133 a template instantiation, do the instantiation. Returns TYPE,
134 whether or not it could be completed, unless something goes
135 horribly wrong, in which case the error_mark_node is returned. */
141 if (type
== NULL_TREE
)
142 /* Rather than crash, we return something sure to cause an error
144 return error_mark_node
;
146 if (type
== error_mark_node
|| TYPE_SIZE (type
) != NULL_TREE
)
148 else if (TREE_CODE (type
) == ARRAY_TYPE
&& TYPE_DOMAIN (type
))
150 tree t
= complete_type (TREE_TYPE (type
));
151 if (TYPE_SIZE (t
) != NULL_TREE
&& ! processing_template_decl
)
153 TYPE_NEEDS_CONSTRUCTING (type
)
154 = TYPE_NEEDS_CONSTRUCTING (TYPE_MAIN_VARIANT (t
));
155 TYPE_NEEDS_DESTRUCTOR (type
)
156 = TYPE_NEEDS_DESTRUCTOR (TYPE_MAIN_VARIANT (t
));
158 else if (IS_AGGR_TYPE (type
) && CLASSTYPE_TEMPLATE_INSTANTIATION (type
))
159 instantiate_class_template (TYPE_MAIN_VARIANT (type
));
164 /* Like complete_type, but issue an error if the TYPE cannot be
165 completed. Returns NULL_TREE if the type cannot be made
169 complete_type_or_else (type
)
172 type
= complete_type (type
);
173 if (type
!= error_mark_node
&& !TYPE_SIZE (type
))
175 incomplete_type_error (NULL_TREE
, type
);
182 /* Return truthvalue of whether type of EXP is instantiated. */
188 return (TREE_CODE (exp
) == OVERLOAD
189 || TREE_CODE (exp
) == TREE_LIST
190 || TREE_TYPE (exp
) == unknown_type_node
191 || (TREE_CODE (TREE_TYPE (exp
)) == OFFSET_TYPE
192 && TREE_TYPE (TREE_TYPE (exp
)) == unknown_type_node
));
195 /* Return truthvalue of whether T is function (or pfn) type. */
201 return (TREE_CODE (t
) == FUNCTION_TYPE
|| TREE_CODE (t
) == METHOD_TYPE
202 || (TREE_CODE (t
) == POINTER_TYPE
203 && (TREE_CODE (TREE_TYPE (t
)) == FUNCTION_TYPE
204 || TREE_CODE (TREE_TYPE (t
)) == METHOD_TYPE
)));
207 /* Do `exp = require_instantiated_type (type, exp);' to make sure EXP
208 does not have an uninstantiated type.
209 TYPE is type to instantiate with, if uninstantiated. */
212 require_instantiated_type (type
, exp
, errval
)
213 tree type
, exp
, errval
;
215 if (TREE_TYPE (exp
) == NULL_TREE
)
217 error ("argument list may not have an initializer list");
221 if (TREE_CODE (exp
) == OVERLOAD
222 || TREE_TYPE (exp
) == unknown_type_node
223 || (TREE_CODE (TREE_TYPE (exp
)) == OFFSET_TYPE
224 && TREE_TYPE (TREE_TYPE (exp
)) == unknown_type_node
))
226 exp
= instantiate_type (type
, exp
, 1);
227 if (TREE_TYPE (exp
) == error_mark_node
)
233 /* Return a variant of TYPE which has all the type qualifiers of LIKE
234 as well as those of TYPE. */
237 qualify_type (type
, like
)
240 int constflag
= TYPE_READONLY (type
) || TYPE_READONLY (like
);
241 int volflag
= TYPE_VOLATILE (type
) || TYPE_VOLATILE (like
);
242 /* @@ Must do member pointers here. */
243 return cp_build_type_variant (type
, constflag
, volflag
);
246 /* Return the common type of two parameter lists.
247 We assume that comptypes has already been done and returned 1;
248 if that isn't so, this may crash.
250 As an optimization, free the space we allocate if the parameter
251 lists are already common. */
257 tree oldargs
= p1
, newargs
, n
;
260 char *first_obj
= (char *) oballoc (0);
262 len
= list_length (p1
);
263 newargs
= tree_last (p1
);
265 if (newargs
== void_list_node
)
274 newargs
= tree_cons (NULL_TREE
, NULL_TREE
, newargs
);
279 p1
= TREE_CHAIN (p1
), p2
= TREE_CHAIN (p2
), n
= TREE_CHAIN (n
), i
++)
281 if (TREE_PURPOSE (p1
) && !TREE_PURPOSE (p2
))
283 TREE_PURPOSE (n
) = TREE_PURPOSE (p1
);
286 else if (! TREE_PURPOSE (p1
))
288 if (TREE_PURPOSE (p2
))
290 TREE_PURPOSE (n
) = TREE_PURPOSE (p2
);
296 if (1 != simple_cst_equal (TREE_PURPOSE (p1
), TREE_PURPOSE (p2
)))
298 TREE_PURPOSE (n
) = TREE_PURPOSE (p2
);
300 if (TREE_VALUE (p1
) != TREE_VALUE (p2
))
303 TREE_VALUE (n
) = common_type (TREE_VALUE (p1
), TREE_VALUE (p2
));
306 TREE_VALUE (n
) = TREE_VALUE (p1
);
317 /* Given a type, perhaps copied for a typedef,
318 find the "original" version of it. */
323 while (TYPE_NAME (t
) != NULL_TREE
)
325 tree x
= TYPE_NAME (t
);
326 if (TREE_CODE (x
) != TYPE_DECL
)
328 x
= DECL_ORIGINAL_TYPE (x
);
336 /* Return the common type of two types.
337 We assume that comptypes has already been done and returned 1;
338 if that isn't so, this may crash.
340 This is the type for the result of most arithmetic operations
341 if the operands have the given two types.
343 We do not deal with enumeral types here because they have already been
344 converted to integer types. */
350 register enum tree_code code1
;
351 register enum tree_code code2
;
354 /* Save time if the two types are the same. */
357 t1
= original_type (t1
);
358 t2
= original_type (t2
);
362 /* If one type is nonsense, use the other. */
363 if (t1
== error_mark_node
)
365 if (t2
== error_mark_node
)
368 /* Merge the attributes. */
369 attributes
= merge_machine_type_attributes (t1
, t2
);
371 { register tree a1
, a2
;
372 a1
= TYPE_ATTRIBUTES (t1
);
373 a2
= TYPE_ATTRIBUTES (t2
);
375 /* Either one unset? Take the set one. */
377 if (!(attributes
= a1
))
380 /* One that completely contains the other? Take it. */
382 else if (a2
&& !attribute_list_contained (a1
, a2
))
384 if (attribute_list_contained (a2
, a1
))
388 /* Pick the longest list, and hang on the other list. */
389 /* ??? For the moment we punt on the issue of attrs with args. */
391 if (list_length (a1
) < list_length (a2
))
392 attributes
= a2
, a2
= a1
;
394 for (; a2
; a2
= TREE_CHAIN (a2
))
395 if (lookup_attribute (IDENTIFIER_POINTER (TREE_PURPOSE (a2
)),
396 attributes
) == NULL_TREE
)
399 TREE_CHAIN (a1
) = attributes
;
406 /* Treat an enum type as the unsigned integer type of the same width. */
408 if (TREE_CODE (t1
) == ENUMERAL_TYPE
)
409 t1
= type_for_size (TYPE_PRECISION (t1
), 1);
410 if (TREE_CODE (t2
) == ENUMERAL_TYPE
)
411 t2
= type_for_size (TYPE_PRECISION (t2
), 1);
413 if (TYPE_PTRMEMFUNC_P (t1
))
414 t1
= TYPE_PTRMEMFUNC_FN_TYPE (t1
);
415 if (TYPE_PTRMEMFUNC_P (t2
))
416 t2
= TYPE_PTRMEMFUNC_FN_TYPE (t2
);
418 code1
= TREE_CODE (t1
);
419 code2
= TREE_CODE (t2
);
421 /* If one type is complex, form the common type of the non-complex
422 components, then make that complex. Use T1 or T2 if it is the
424 if (code1
== COMPLEX_TYPE
|| code2
== COMPLEX_TYPE
)
426 tree subtype1
= code1
== COMPLEX_TYPE
? TREE_TYPE (t1
) : t1
;
427 tree subtype2
= code2
== COMPLEX_TYPE
? TREE_TYPE (t2
) : t2
;
428 tree subtype
= common_type (subtype1
, subtype2
);
430 if (code1
== COMPLEX_TYPE
&& TREE_TYPE (t1
) == subtype
)
431 return build_type_attribute_variant (t1
, attributes
);
432 else if (code2
== COMPLEX_TYPE
&& TREE_TYPE (t2
) == subtype
)
433 return build_type_attribute_variant (t2
, attributes
);
435 return build_type_attribute_variant (build_complex_type (subtype
),
443 /* If only one is real, use it as the result. */
445 if (code1
== REAL_TYPE
&& code2
!= REAL_TYPE
)
446 return build_type_attribute_variant (t1
, attributes
);
448 if (code2
== REAL_TYPE
&& code1
!= REAL_TYPE
)
449 return build_type_attribute_variant (t2
, attributes
);
451 /* Both real or both integers; use the one with greater precision. */
453 if (TYPE_PRECISION (t1
) > TYPE_PRECISION (t2
))
454 return build_type_attribute_variant (t1
, attributes
);
455 else if (TYPE_PRECISION (t2
) > TYPE_PRECISION (t1
))
456 return build_type_attribute_variant (t2
, attributes
);
458 /* Same precision. Prefer longs to ints even when same size. */
460 if (TYPE_MAIN_VARIANT (t1
) == long_unsigned_type_node
461 || TYPE_MAIN_VARIANT (t2
) == long_unsigned_type_node
)
462 return build_type_attribute_variant (long_unsigned_type_node
,
465 if (TYPE_MAIN_VARIANT (t1
) == long_integer_type_node
466 || TYPE_MAIN_VARIANT (t2
) == long_integer_type_node
)
468 /* But preserve unsignedness from the other type,
469 since long cannot hold all the values of an unsigned int. */
470 if (TREE_UNSIGNED (t1
) || TREE_UNSIGNED (t2
))
471 t1
= long_unsigned_type_node
;
473 t1
= long_integer_type_node
;
474 return build_type_attribute_variant (t1
, attributes
);
477 if (TYPE_MAIN_VARIANT (t1
) == long_double_type_node
478 || TYPE_MAIN_VARIANT (t2
) == long_double_type_node
)
479 return build_type_attribute_variant (long_double_type_node
,
482 /* Otherwise prefer the unsigned one. */
484 if (TREE_UNSIGNED (t1
))
485 return build_type_attribute_variant (t1
, attributes
);
487 return build_type_attribute_variant (t2
, attributes
);
491 /* For two pointers, do this recursively on the target type,
492 and combine the qualifiers of the two types' targets. */
493 /* This code was turned off; I don't know why.
494 But ANSI C++ specifies doing this with the qualifiers.
495 So I turned it on again. */
497 tree tt1
= TYPE_MAIN_VARIANT (TREE_TYPE (t1
));
498 tree tt2
= TYPE_MAIN_VARIANT (TREE_TYPE (t2
));
500 = TYPE_READONLY (TREE_TYPE (t1
)) || TYPE_READONLY (TREE_TYPE (t2
));
502 = TYPE_VOLATILE (TREE_TYPE (t1
)) || TYPE_VOLATILE (TREE_TYPE (t2
));
507 else if (tt1
== void_type_node
|| tt2
== void_type_node
)
508 target
= void_type_node
;
509 else if (tt1
== unknown_type_node
)
511 else if (tt2
== unknown_type_node
)
514 target
= common_type (tt1
, tt2
);
516 target
= cp_build_type_variant (target
, constp
, volatilep
);
517 if (code1
== POINTER_TYPE
)
518 t1
= build_pointer_type (target
);
520 t1
= build_reference_type (target
);
521 t1
= build_type_attribute_variant (t1
, attributes
);
523 if (TREE_CODE (target
) == METHOD_TYPE
)
524 t1
= build_ptrmemfunc_type (t1
);
531 tree elt
= common_type (TREE_TYPE (t1
), TREE_TYPE (t2
));
532 /* Save space: see if the result is identical to one of the args. */
533 if (elt
== TREE_TYPE (t1
) && TYPE_DOMAIN (t1
))
534 return build_type_attribute_variant (t1
, attributes
);
535 if (elt
== TREE_TYPE (t2
) && TYPE_DOMAIN (t2
))
536 return build_type_attribute_variant (t2
, attributes
);
537 /* Merge the element types, and have a size if either arg has one. */
538 t1
= build_cplus_array_type
539 (elt
, TYPE_DOMAIN (TYPE_DOMAIN (t1
) ? t1
: t2
));
540 return build_type_attribute_variant (t1
, attributes
);
544 /* Function types: prefer the one that specified arg types.
545 If both do, merge the arg types. Also merge the return types. */
547 tree valtype
= common_type (TREE_TYPE (t1
), TREE_TYPE (t2
));
548 tree p1
= TYPE_ARG_TYPES (t1
);
549 tree p2
= TYPE_ARG_TYPES (t2
);
552 /* Save space: see if the result is identical to one of the args. */
553 if (valtype
== TREE_TYPE (t1
) && ! p2
)
554 return build_type_attribute_variant (t1
, attributes
);
555 if (valtype
== TREE_TYPE (t2
) && ! p1
)
556 return build_type_attribute_variant (t2
, attributes
);
558 /* Simple way if one arg fails to specify argument types. */
559 if (p1
== NULL_TREE
|| TREE_VALUE (p1
) == void_type_node
)
561 rval
= build_function_type (valtype
, p2
);
562 if ((raises
= TYPE_RAISES_EXCEPTIONS (t2
)))
563 rval
= build_exception_variant (rval
, raises
);
564 return build_type_attribute_variant (rval
, attributes
);
566 raises
= TYPE_RAISES_EXCEPTIONS (t1
);
567 if (p2
== NULL_TREE
|| TREE_VALUE (p2
) == void_type_node
)
569 rval
= build_function_type (valtype
, p1
);
571 rval
= build_exception_variant (rval
, raises
);
572 return build_type_attribute_variant (rval
, attributes
);
575 rval
= build_function_type (valtype
, commonparms (p1
, p2
));
576 rval
= build_exception_variant (rval
, raises
);
577 return build_type_attribute_variant (rval
, attributes
);
582 t1
= TYPE_MAIN_VARIANT (t1
);
583 t2
= TYPE_MAIN_VARIANT (t2
);
585 if (DERIVED_FROM_P (t1
, t2
) && binfo_or_else (t1
, t2
))
586 return build_type_attribute_variant (t1
, attributes
);
587 else if (binfo_or_else (t2
, t1
))
588 return build_type_attribute_variant (t2
, attributes
);
590 compiler_error ("common_type called with uncommon aggregate types");
593 if (TREE_CODE (TREE_TYPE (t1
)) == TREE_CODE (TREE_TYPE (t2
)))
595 /* Get this value the long way, since TYPE_METHOD_BASETYPE
596 is just the main variant of this. */
600 tree b1
= TYPE_OFFSET_BASETYPE (t1
);
601 tree b2
= TYPE_OFFSET_BASETYPE (t2
);
603 if (comptypes (b1
, b2
, 1)
604 || (DERIVED_FROM_P (b1
, b2
) && binfo_or_else (b1
, b2
)))
605 basetype
= TREE_TYPE (TREE_VALUE (TYPE_ARG_TYPES (t2
)));
608 if (binfo_or_else (b2
, b1
) == NULL_TREE
)
609 compiler_error ("common_type called with uncommon method types");
610 basetype
= TREE_TYPE (TREE_VALUE (TYPE_ARG_TYPES (t1
)));
613 raises
= TYPE_RAISES_EXCEPTIONS (t1
);
615 /* If this was a member function type, get back to the
616 original type of type member function (i.e., without
617 the class instance variable up front. */
618 t1
= build_function_type (TREE_TYPE (t1
),
619 TREE_CHAIN (TYPE_ARG_TYPES (t1
)));
620 t2
= build_function_type (TREE_TYPE (t2
),
621 TREE_CHAIN (TYPE_ARG_TYPES (t2
)));
622 t3
= common_type (t1
, t2
);
623 t3
= build_cplus_method_type (basetype
, TREE_TYPE (t3
),
624 TYPE_ARG_TYPES (t3
));
625 t1
= build_exception_variant (t3
, raises
);
628 compiler_error ("common_type called with uncommon method types");
630 return build_type_attribute_variant (t1
, attributes
);
633 if (TREE_TYPE (t1
) == TREE_TYPE (t2
))
635 tree b1
= TYPE_OFFSET_BASETYPE (t1
);
636 tree b2
= TYPE_OFFSET_BASETYPE (t2
);
638 if (comptypes (b1
, b2
, 1)
639 || (DERIVED_FROM_P (b1
, b2
) && binfo_or_else (b1
, b2
)))
640 return build_type_attribute_variant (t2
, attributes
);
641 else if (binfo_or_else (b2
, b1
))
642 return build_type_attribute_variant (t1
, attributes
);
644 compiler_error ("common_type called with uncommon member types");
647 return build_type_attribute_variant (t1
, attributes
);
651 /* Return 1 if TYPE1 and TYPE2 raise the same exceptions. */
654 compexcepttypes (t1
, t2
)
657 return TYPE_RAISES_EXCEPTIONS (t1
) == TYPE_RAISES_EXCEPTIONS (t2
);
661 comp_array_types (cmp
, t1
, t2
, strict
)
662 register int (*cmp
) PROTO((tree
, tree
, int));
666 tree d1
= TYPE_DOMAIN (t1
);
667 tree d2
= TYPE_DOMAIN (t2
);
669 /* Target types must match incl. qualifiers. */
670 if (!(TREE_TYPE (t1
) == TREE_TYPE (t2
)
671 || (*cmp
) (TREE_TYPE (t1
), TREE_TYPE (t2
), strict
)))
674 /* Sizes must match unless one is missing or variable. */
675 if (d1
== 0 || d2
== 0 || d1
== d2
676 || TREE_CODE (TYPE_MIN_VALUE (d1
)) != INTEGER_CST
677 || TREE_CODE (TYPE_MIN_VALUE (d2
)) != INTEGER_CST
678 || TREE_CODE (TYPE_MAX_VALUE (d1
)) != INTEGER_CST
679 || TREE_CODE (TYPE_MAX_VALUE (d2
)) != INTEGER_CST
)
682 return ((TREE_INT_CST_LOW (TYPE_MIN_VALUE (d1
))
683 == TREE_INT_CST_LOW (TYPE_MIN_VALUE (d2
)))
684 && (TREE_INT_CST_HIGH (TYPE_MIN_VALUE (d1
))
685 == TREE_INT_CST_HIGH (TYPE_MIN_VALUE (d2
)))
686 && (TREE_INT_CST_LOW (TYPE_MAX_VALUE (d1
))
687 == TREE_INT_CST_LOW (TYPE_MAX_VALUE (d2
)))
688 && (TREE_INT_CST_HIGH (TYPE_MAX_VALUE (d1
))
689 == TREE_INT_CST_HIGH (TYPE_MAX_VALUE (d2
))));
692 /* Return 1 if TYPE1 and TYPE2 are compatible types for assignment
693 or various other operations. This is what ANSI C++ speaks of as
696 For C++: argument STRICT says we should be strict about this
699 2 : strict, except that if one type is a reference and
700 the other is not, compare the target type of the
701 reference to the type that's not a reference (ARM, p308).
702 This is used for checking for invalid overloading.
703 1 : strict (compared according to ANSI C)
704 This is used for checking whether two function decls match.
705 0 : <= (compared according to C++)
706 -1: <= or >= (relaxed)
708 Otherwise, pointers involving base classes and derived classes can
709 be mixed as valid: i.e. a pointer to a derived class may be converted
710 to a pointer to one of its base classes, as per C++. A pointer to
711 a derived class may be passed as a parameter to a function expecting a
712 pointer to a base classes. These allowances do not commute. In this
713 case, TYPE1 is assumed to be the base class, and TYPE2 is assumed to
714 be the derived class. */
717 comptypes (type1
, type2
, strict
)
721 register tree t1
= type1
;
722 register tree t2
= type2
;
725 /* Suppress errors caused by previously reported errors */
730 /* This should never happen. */
731 my_friendly_assert (t1
!= error_mark_node
, 307);
733 if (t2
== error_mark_node
)
738 /* Treat an enum type as the unsigned integer type of the same width. */
740 if (TREE_CODE (t1
) == ENUMERAL_TYPE
)
741 t1
= type_for_size (TYPE_PRECISION (t1
), 1);
742 if (TREE_CODE (t2
) == ENUMERAL_TYPE
)
743 t2
= type_for_size (TYPE_PRECISION (t2
), 1);
749 if (TYPE_PTRMEMFUNC_P (t1
))
750 t1
= TYPE_PTRMEMFUNC_FN_TYPE (t1
);
751 if (TYPE_PTRMEMFUNC_P (t2
))
752 t2
= TYPE_PTRMEMFUNC_FN_TYPE (t2
);
754 /* Different classes of types can't be compatible. */
756 if (TREE_CODE (t1
) != TREE_CODE (t2
))
759 && ((TREE_CODE (t1
) == REFERENCE_TYPE
)
760 ^ (TREE_CODE (t2
) == REFERENCE_TYPE
)))
762 if (TREE_CODE (t1
) == REFERENCE_TYPE
)
763 return comptypes (TREE_TYPE (t1
), t2
, 1);
764 return comptypes (t1
, TREE_TYPE (t2
), 1);
772 /* Qualifiers must match. */
774 if (TYPE_READONLY (t1
) != TYPE_READONLY (t2
))
776 if (TYPE_VOLATILE (t1
) != TYPE_VOLATILE (t2
))
778 if (strict
> 0 && TYPE_FOR_JAVA (t1
) != TYPE_FOR_JAVA (t2
))
781 /* Allow for two different type nodes which have essentially the same
782 definition. Note that we already checked for equality of the type
783 qualifiers (just above). */
785 if (TYPE_MAIN_VARIANT (t1
) == TYPE_MAIN_VARIANT (t2
))
788 /* ??? COMP_TYPE_ATTRIBUTES is currently useless for variables as each
789 attribute is its own main variant (`val' will remain 0). */
790 #ifndef COMP_TYPE_ATTRIBUTES
791 #define COMP_TYPE_ATTRIBUTES(t1,t2) 1
794 /* 1 if no need for warning yet, 2 if warning cause has been seen. */
795 if (! (attrval
= COMP_TYPE_ATTRIBUTES (t1
, t2
)))
798 /* 1 if no need for warning yet, 2 if warning cause has been seen. */
801 switch (TREE_CODE (t1
))
803 case TEMPLATE_TEMPLATE_PARM
:
804 if (TEMPLATE_TYPE_IDX (t1
) != TEMPLATE_TYPE_IDX (t2
)
805 || TEMPLATE_TYPE_LEVEL (t1
) != TEMPLATE_TYPE_LEVEL (t2
))
807 if (! CLASSTYPE_TEMPLATE_INFO (t1
) && ! CLASSTYPE_TEMPLATE_INFO (t2
))
809 /* Don't check inheritance. */
815 if (CLASSTYPE_TEMPLATE_INFO (t1
) && CLASSTYPE_TEMPLATE_INFO (t2
)
816 && (CLASSTYPE_TI_TEMPLATE (t1
) == CLASSTYPE_TI_TEMPLATE (t2
)
817 || TREE_CODE (t1
) == TEMPLATE_TEMPLATE_PARM
))
818 return comp_template_args (CLASSTYPE_TI_ARGS (t1
),
819 CLASSTYPE_TI_ARGS (t2
));
825 val
= (comptypes (build_pointer_type (TYPE_OFFSET_BASETYPE (t1
)),
826 build_pointer_type (TYPE_OFFSET_BASETYPE (t2
)), strict
)
827 && comptypes (TREE_TYPE (t1
), TREE_TYPE (t2
), strict
));
831 if (! compexcepttypes (t1
, t2
))
834 /* This case is anti-symmetrical!
835 One can pass a base member (or member function)
836 to something expecting a derived member (or member function),
837 but not vice-versa! */
839 val
= (comptypes (TREE_TYPE (t1
), TREE_TYPE (t2
), strict
)
840 && compparms (TYPE_ARG_TYPES (t1
),
841 TYPE_ARG_TYPES (t2
), strict
));
855 if (TREE_CODE (t1
) == RECORD_TYPE
&& TREE_CODE (t2
) == RECORD_TYPE
)
859 rval
= t1
== t2
|| DERIVED_FROM_P (t1
, t2
);
868 val
= DERIVED_FROM_P (t2
, t1
);
875 val
= comptypes (t1
, t2
, strict
);
879 if (! compexcepttypes (t1
, t2
))
882 val
= ((TREE_TYPE (t1
) == TREE_TYPE (t2
)
883 || comptypes (TREE_TYPE (t1
), TREE_TYPE (t2
), strict
))
884 && compparms (TYPE_ARG_TYPES (t1
), TYPE_ARG_TYPES (t2
), strict
));
888 /* Target types must match incl. qualifiers. */
889 val
= comp_array_types (comptypes
, t1
, t2
, strict
);
892 case TEMPLATE_TYPE_PARM
:
893 return TEMPLATE_TYPE_IDX (t1
) == TEMPLATE_TYPE_IDX (t2
)
894 && TEMPLATE_TYPE_LEVEL (t1
) == TEMPLATE_TYPE_LEVEL (t2
);
897 if (TYPE_IDENTIFIER (t1
) != TYPE_IDENTIFIER (t2
))
899 return comptypes (TYPE_CONTEXT (t1
), TYPE_CONTEXT (t2
), 1);
904 return attrval
== 2 && val
== 1 ? 2 : val
;
907 /* Return 1 or -1 if TTL and TTR are pointers to types that are equivalent,
908 ignoring their qualifiers, 0 if not. Return 1 means that TTR can be
909 converted to TTL. Return -1 means that TTL can be converted to TTR but
912 NPTRS is the number of pointers we can strip off and keep cool.
913 This is used to permit (for aggr A, aggr B) A, B* to convert to A*,
914 but to not permit B** to convert to A**.
916 This should go away. Callers should use can_convert or something
917 similar instead. (jason 17 Apr 1997) */
920 comp_target_types (ttl
, ttr
, nptrs
)
924 ttl
= TYPE_MAIN_VARIANT (ttl
);
925 ttr
= TYPE_MAIN_VARIANT (ttr
);
929 if (TREE_CODE (ttr
) != TREE_CODE (ttl
))
932 if (TREE_CODE (ttr
) == POINTER_TYPE
933 || (TREE_CODE (ttr
) == REFERENCE_TYPE
))
935 int is_ptr
= TREE_CODE (ttr
) == POINTER_TYPE
;
937 ttl
= TREE_TYPE (ttl
);
938 ttr
= TREE_TYPE (ttr
);
940 if (nptrs
> 0 && is_ptr
)
942 if (TREE_CODE (ttl
) == UNKNOWN_TYPE
943 || TREE_CODE (ttr
) == UNKNOWN_TYPE
)
945 else if (TREE_CODE (ttl
) == VOID_TYPE
946 && TREE_CODE (ttr
) != FUNCTION_TYPE
947 && TREE_CODE (ttr
) != METHOD_TYPE
948 && TREE_CODE (ttr
) != OFFSET_TYPE
)
950 else if (TREE_CODE (ttr
) == VOID_TYPE
951 && TREE_CODE (ttl
) != FUNCTION_TYPE
952 && TREE_CODE (ttl
) != METHOD_TYPE
953 && TREE_CODE (ttl
) != OFFSET_TYPE
)
955 else if (TREE_CODE (ttl
) == POINTER_TYPE
956 || TREE_CODE (ttl
) == ARRAY_TYPE
)
958 if (comp_ptr_ttypes (ttl
, ttr
))
960 else if (comp_ptr_ttypes (ttr
, ttl
))
966 /* Const and volatile mean something different for function types,
967 so the usual checks are not appropriate. */
968 if (TREE_CODE (ttl
) == FUNCTION_TYPE
|| TREE_CODE (ttl
) == METHOD_TYPE
)
969 return comp_target_types (ttl
, ttr
, nptrs
- 1);
971 /* Make sure that the cv-quals change only in the same direction as
975 int c
= TYPE_READONLY (ttl
) - TYPE_READONLY (ttr
);
976 int v
= TYPE_VOLATILE (ttl
) - TYPE_VOLATILE (ttr
);
978 if ((c
> 0 && v
< 0) || (c
< 0 && v
> 0))
981 if (TYPE_MAIN_VARIANT (ttl
) == TYPE_MAIN_VARIANT (ttr
))
982 return (c
+ v
< 0) ? -1 : 1;
984 t
= comp_target_types (ttl
, ttr
, nptrs
- 1);
985 if ((t
== 1 && c
+ v
>= 0) || (t
== -1 && c
+ v
<= 0))
992 if (TREE_CODE (ttr
) == ARRAY_TYPE
)
993 return comp_array_types (comp_target_types
, ttl
, ttr
, 0);
994 else if (TREE_CODE (ttr
) == FUNCTION_TYPE
|| TREE_CODE (ttr
) == METHOD_TYPE
)
1001 if (comptypes (TREE_TYPE (ttl
), TREE_TYPE (ttr
), 1) == 0)
1006 switch (comp_target_types (TREE_TYPE (ttl
), TREE_TYPE (ttr
), -1))
1015 argsl
= TYPE_ARG_TYPES (ttl
);
1016 argsr
= TYPE_ARG_TYPES (ttr
);
1018 /* Compare 'this' here, not in comp_target_parms. */
1019 if (TREE_CODE (ttr
) == METHOD_TYPE
)
1021 tree tl
= TYPE_METHOD_BASETYPE (ttl
);
1022 tree tr
= TYPE_METHOD_BASETYPE (ttr
);
1024 if (comptypes (tr
, tl
, 0) == 0)
1026 if (comptypes (tl
, tr
, 0))
1032 argsl
= TREE_CHAIN (argsl
);
1033 argsr
= TREE_CHAIN (argsr
);
1036 switch (comp_target_parms (argsl
, argsr
, 1))
1044 return saw_contra
? -1 : 1;
1047 else if (TREE_CODE (ttr
) == OFFSET_TYPE
)
1049 /* Contravariance: we can assign a pointer to base member to a pointer
1050 to derived member. Note difference from simple pointer case, where
1051 we can pass a pointer to derived to a pointer to base. */
1052 if (comptypes (TYPE_OFFSET_BASETYPE (ttr
),
1053 TYPE_OFFSET_BASETYPE (ttl
), 0))
1054 return comp_target_types (TREE_TYPE (ttl
), TREE_TYPE (ttr
), nptrs
);
1055 else if (comptypes (TYPE_OFFSET_BASETYPE (ttl
),
1056 TYPE_OFFSET_BASETYPE (ttr
), 0)
1057 && comp_target_types (TREE_TYPE (ttl
), TREE_TYPE (ttr
), nptrs
))
1060 else if (IS_AGGR_TYPE (ttl
))
1064 if (comptypes (build_pointer_type (ttl
), build_pointer_type (ttr
), 0))
1066 if (comptypes (build_pointer_type (ttr
), build_pointer_type (ttl
), 0))
1074 /* Returns 1 if TYPE1 is more cv-qualified than TYPE2, -1 if TYPE2 is
1075 more cv-qualified that TYPE1, and 0 otherwise. */
1078 comp_cv_qualification (type1
, type2
)
1082 if (TYPE_READONLY (type1
) == TYPE_READONLY (type2
)
1083 && TYPE_VOLATILE (type1
) == TYPE_VOLATILE (type2
))
1086 if (TYPE_READONLY (type1
) >= TYPE_READONLY (type2
)
1087 && TYPE_VOLATILE (type1
) >= TYPE_VOLATILE (type2
))
1090 if (TYPE_READONLY (type2
) >= TYPE_READONLY (type1
)
1091 && TYPE_VOLATILE (type2
) >= TYPE_VOLATILE (type1
))
1097 /* Returns 1 if the cv-qualification signature of TYPE1 is a proper
1098 subset of the cv-qualification signature of TYPE2, and the types
1099 are similar. Returns -1 if the other way 'round, and 0 otherwise. */
1102 comp_cv_qual_signature (type1
, type2
)
1106 if (comp_ptr_ttypes_real (type2
, type1
, -1))
1108 else if (comp_ptr_ttypes_real (type1
, type2
, -1))
1114 /* If two types share a common base type, return that basetype.
1115 If there is not a unique most-derived base type, this function
1116 returns ERROR_MARK_NODE. */
1119 common_base_type (tt1
, tt2
)
1122 tree best
= NULL_TREE
;
1125 /* If one is a baseclass of another, that's good enough. */
1126 if (UNIQUELY_DERIVED_FROM_P (tt1
, tt2
))
1128 if (UNIQUELY_DERIVED_FROM_P (tt2
, tt1
))
1131 /* Otherwise, try to find a unique baseclass of TT1
1132 that is shared by TT2, and follow that down. */
1133 for (i
= CLASSTYPE_N_BASECLASSES (tt1
)-1; i
>= 0; i
--)
1135 tree basetype
= TYPE_BINFO_BASETYPE (tt1
, i
);
1136 tree trial
= common_base_type (basetype
, tt2
);
1139 if (trial
== error_mark_node
)
1141 if (best
== NULL_TREE
)
1143 else if (best
!= trial
)
1144 return error_mark_node
;
1149 for (i
= CLASSTYPE_N_BASECLASSES (tt2
)-1; i
>= 0; i
--)
1151 tree basetype
= TYPE_BINFO_BASETYPE (tt2
, i
);
1152 tree trial
= common_base_type (tt1
, basetype
);
1155 if (trial
== error_mark_node
)
1157 if (best
== NULL_TREE
)
1159 else if (best
!= trial
)
1160 return error_mark_node
;
1166 /* Subroutines of `comptypes'. */
1168 /* Return 1 if two parameter type lists PARMS1 and PARMS2
1169 are equivalent in the sense that functions with those parameter types
1170 can have equivalent types.
1171 If either list is empty, we win.
1172 Otherwise, the two lists must be equivalent, element by element.
1174 C++: See comment above about TYPE1, TYPE2.
1176 STRICT is no longer used. */
1179 compparms (parms1
, parms2
, strict
)
1180 tree parms1
, parms2
;
1183 register tree t1
= parms1
, t2
= parms2
;
1185 /* An unspecified parmlist matches any specified parmlist
1186 whose argument types don't need default promotions. */
1190 if (t1
== 0 && t2
== 0)
1192 /* If one parmlist is shorter than the other,
1193 they fail to match. */
1194 if (t1
== 0 || t2
== 0)
1196 if (! comptypes (TREE_VALUE (t2
), TREE_VALUE (t1
), 1))
1199 t1
= TREE_CHAIN (t1
);
1200 t2
= TREE_CHAIN (t2
);
1204 /* This really wants return whether or not parameter type lists
1205 would make their owning functions assignment compatible or not.
1207 The return value is like for comp_target_types.
1209 This should go away, possibly with the exception of the empty parmlist
1210 conversion; there are no conversions between function types in C++.
1211 (jason 17 Apr 1997) */
1214 comp_target_parms (parms1
, parms2
, strict
)
1215 tree parms1
, parms2
;
1218 register tree t1
= parms1
, t2
= parms2
;
1219 int warn_contravariance
= 0;
1221 /* In C, an unspecified parmlist matches any specified parmlist
1222 whose argument types don't need default promotions. This is not
1223 true for C++, but let's do it anyway for unfixed headers. */
1225 if (t1
== 0 && t2
!= 0)
1227 cp_pedwarn ("ANSI C++ prohibits conversion from `(%#T)' to `(...)'",
1229 return self_promoting_args_p (t2
);
1232 return self_promoting_args_p (t1
);
1234 for (; t1
|| t2
; t1
= TREE_CHAIN (t1
), t2
= TREE_CHAIN (t2
))
1238 /* If one parmlist is shorter than the other,
1239 they fail to match, unless STRICT is <= 0. */
1240 if (t1
== 0 || t2
== 0)
1245 return 1 + warn_contravariance
;
1246 return ((t1
&& TREE_PURPOSE (t1
)) + warn_contravariance
);
1248 p1
= TREE_VALUE (t1
);
1249 p2
= TREE_VALUE (t2
);
1250 if (comptypes (p1
, p2
, 1))
1256 if ((TREE_CODE (p1
) == POINTER_TYPE
&& TREE_CODE (p2
) == POINTER_TYPE
)
1257 || (TREE_CODE (p1
) == REFERENCE_TYPE
1258 && TREE_CODE (p2
) == REFERENCE_TYPE
))
1261 && (TYPE_MAIN_VARIANT (TREE_TYPE (p1
))
1262 == TYPE_MAIN_VARIANT (TREE_TYPE (p2
))))
1265 /* The following is wrong for contravariance,
1266 but many programs depend on it. */
1267 if (TREE_TYPE (p1
) == void_type_node
)
1269 if (TREE_TYPE (p2
) == void_type_node
)
1271 warn_contravariance
= 1;
1274 if (IS_AGGR_TYPE (TREE_TYPE (p1
)))
1276 if (comptypes (TYPE_MAIN_VARIANT (TREE_TYPE (p1
)),
1277 TYPE_MAIN_VARIANT (TREE_TYPE (p2
)), 1) == 0)
1281 /* Note backwards order due to contravariance. */
1282 if (comp_target_types (p2
, p1
, 1) <= 0)
1284 if (comp_target_types (p1
, p2
, 1) > 0)
1286 warn_contravariance
= 1;
1293 return warn_contravariance
? -1 : 1;
1296 /* Return 1 if PARMS specifies a fixed number of parameters
1297 and none of their types is affected by default promotions. */
1300 self_promoting_args_p (parms
)
1304 for (t
= parms
; t
; t
= TREE_CHAIN (t
))
1306 register tree type
= TREE_VALUE (t
);
1308 if (TREE_CHAIN (t
) == 0 && type
!= void_type_node
)
1314 if (TYPE_MAIN_VARIANT (type
) == float_type_node
)
1317 if (C_PROMOTING_INTEGER_TYPE_P (type
))
1323 /* Return an unsigned type the same as TYPE in other respects.
1325 C++: must make these work for type variants as well. */
1328 unsigned_type (type
)
1331 tree type1
= TYPE_MAIN_VARIANT (type
);
1332 if (type1
== signed_char_type_node
|| type1
== char_type_node
)
1333 return unsigned_char_type_node
;
1334 if (type1
== integer_type_node
)
1335 return unsigned_type_node
;
1336 if (type1
== short_integer_type_node
)
1337 return short_unsigned_type_node
;
1338 if (type1
== long_integer_type_node
)
1339 return long_unsigned_type_node
;
1340 if (type1
== long_long_integer_type_node
)
1341 return long_long_unsigned_type_node
;
1342 if (type1
== intTI_type_node
)
1343 return unsigned_intTI_type_node
;
1344 if (type1
== intDI_type_node
)
1345 return unsigned_intDI_type_node
;
1346 if (type1
== intSI_type_node
)
1347 return unsigned_intSI_type_node
;
1348 if (type1
== intHI_type_node
)
1349 return unsigned_intHI_type_node
;
1350 if (type1
== intQI_type_node
)
1351 return unsigned_intQI_type_node
;
1353 return signed_or_unsigned_type (1, type
);
1356 /* Return a signed type the same as TYPE in other respects. */
1362 tree type1
= TYPE_MAIN_VARIANT (type
);
1363 if (type1
== unsigned_char_type_node
|| type1
== char_type_node
)
1364 return signed_char_type_node
;
1365 if (type1
== unsigned_type_node
)
1366 return integer_type_node
;
1367 if (type1
== short_unsigned_type_node
)
1368 return short_integer_type_node
;
1369 if (type1
== long_unsigned_type_node
)
1370 return long_integer_type_node
;
1371 if (type1
== long_long_unsigned_type_node
)
1372 return long_long_integer_type_node
;
1373 if (type1
== unsigned_intTI_type_node
)
1374 return intTI_type_node
;
1375 if (type1
== unsigned_intDI_type_node
)
1376 return intDI_type_node
;
1377 if (type1
== unsigned_intSI_type_node
)
1378 return intSI_type_node
;
1379 if (type1
== unsigned_intHI_type_node
)
1380 return intHI_type_node
;
1381 if (type1
== unsigned_intQI_type_node
)
1382 return intQI_type_node
;
1384 return signed_or_unsigned_type (0, type
);
1387 /* Return a type the same as TYPE except unsigned or
1388 signed according to UNSIGNEDP. */
1391 signed_or_unsigned_type (unsignedp
, type
)
1395 if (! INTEGRAL_TYPE_P (type
)
1396 || TREE_UNSIGNED (type
) == unsignedp
)
1399 if (TYPE_PRECISION (type
) == TYPE_PRECISION (signed_char_type_node
))
1400 return unsignedp
? unsigned_char_type_node
: signed_char_type_node
;
1401 if (TYPE_PRECISION (type
) == TYPE_PRECISION (integer_type_node
))
1402 return unsignedp
? unsigned_type_node
: integer_type_node
;
1403 if (TYPE_PRECISION (type
) == TYPE_PRECISION (short_integer_type_node
))
1404 return unsignedp
? short_unsigned_type_node
: short_integer_type_node
;
1405 if (TYPE_PRECISION (type
) == TYPE_PRECISION (long_integer_type_node
))
1406 return unsignedp
? long_unsigned_type_node
: long_integer_type_node
;
1407 if (TYPE_PRECISION (type
) == TYPE_PRECISION (long_long_integer_type_node
))
1408 return (unsignedp
? long_long_unsigned_type_node
1409 : long_long_integer_type_node
);
1413 /* Compute the value of the `sizeof' operator. */
1419 enum tree_code code
= TREE_CODE (type
);
1422 if (processing_template_decl
)
1423 return build_min (SIZEOF_EXPR
, sizetype
, type
);
1425 if (code
== FUNCTION_TYPE
)
1427 if (pedantic
|| warn_pointer_arith
)
1428 pedwarn ("ANSI C++ forbids taking the sizeof a function type");
1429 return size_int (1);
1431 if (code
== METHOD_TYPE
)
1433 if (pedantic
|| warn_pointer_arith
)
1434 pedwarn ("ANSI C++ forbids taking the sizeof a method type");
1435 return size_int (1);
1437 if (code
== VOID_TYPE
)
1439 if (pedantic
|| warn_pointer_arith
)
1440 pedwarn ("ANSI C++ forbids taking the sizeof a void type");
1441 return size_int (1);
1443 if (code
== ERROR_MARK
)
1444 return size_int (1);
1446 /* ARM $5.3.2: ``When applied to a reference, the result is the size of the
1447 referenced object.'' */
1448 if (code
== REFERENCE_TYPE
)
1449 type
= TREE_TYPE (type
);
1451 /* We couldn't find anything in the ARM or the draft standard that says,
1452 one way or the other, if doing sizeof on something that doesn't have
1453 an object associated with it is correct or incorrect. For example, if
1454 you declare `struct S { char str[16]; };', and in your program do
1455 a `sizeof (S::str)', should we flag that as an error or should we give
1456 the size of it? Since it seems like a reasonable thing to do, we'll go
1457 with giving the value. */
1458 if (code
== OFFSET_TYPE
)
1459 type
= TREE_TYPE (type
);
1461 /* @@ This also produces an error for a signature ref.
1462 In that case we should be able to do better. */
1463 if (IS_SIGNATURE (type
))
1465 error ("`sizeof' applied to a signature type");
1466 return size_int (0);
1469 if (TYPE_SIZE (complete_type (type
)) == 0)
1471 cp_error ("`sizeof' applied to incomplete type `%T'", type
);
1472 return size_int (0);
1475 /* Convert in case a char is more than one unit. */
1476 t
= size_binop (CEIL_DIV_EXPR
, TYPE_SIZE (type
),
1477 size_int (TYPE_PRECISION (char_type_node
)));
1478 t
= convert (sizetype
, t
);
1479 /* size_binop does not put the constant in range, so do it now. */
1480 if (TREE_CODE (t
) == INTEGER_CST
&& force_fit_type (t
, 0))
1481 TREE_CONSTANT_OVERFLOW (t
) = TREE_OVERFLOW (t
) = 1;
1489 if (processing_template_decl
)
1490 return build_min (SIZEOF_EXPR
, sizetype
, e
);
1492 if (TREE_CODE (e
) == COMPONENT_REF
1493 && DECL_BIT_FIELD (TREE_OPERAND (e
, 1)))
1494 error ("sizeof applied to a bit-field");
1495 /* ANSI says arrays and functions are converted inside comma.
1496 But we can't really convert them in build_compound_expr
1497 because that would break commas in lvalues.
1498 So do the conversion here if operand was a comma. */
1499 if (TREE_CODE (e
) == COMPOUND_EXPR
1500 && (TREE_CODE (TREE_TYPE (e
)) == ARRAY_TYPE
1501 || TREE_CODE (TREE_TYPE (e
)) == FUNCTION_TYPE
))
1502 e
= default_conversion (e
);
1503 else if (TREE_CODE (e
) == TREE_LIST
)
1505 tree t
= TREE_VALUE (e
);
1508 && TREE_CODE (TREE_TYPE (t
)) == FUNCTION_TYPE
)
1509 || is_overloaded_fn (t
)))
1510 pedwarn ("ANSI C++ forbids taking the sizeof a function type");
1512 return c_sizeof (TREE_TYPE (e
));
1516 c_sizeof_nowarn (type
)
1519 enum tree_code code
= TREE_CODE (type
);
1522 if (code
== FUNCTION_TYPE
1523 || code
== METHOD_TYPE
1524 || code
== VOID_TYPE
1525 || code
== ERROR_MARK
)
1526 return size_int (1);
1527 if (code
== REFERENCE_TYPE
)
1528 type
= TREE_TYPE (type
);
1530 if (TYPE_SIZE (type
) == 0)
1531 return size_int (0);
1533 /* Convert in case a char is more than one unit. */
1534 t
= size_binop (CEIL_DIV_EXPR
, TYPE_SIZE (type
),
1535 size_int (TYPE_PRECISION (char_type_node
)));
1536 t
= convert (sizetype
, t
);
1537 force_fit_type (t
, 0);
1541 /* Implement the __alignof keyword: Return the minimum required
1542 alignment of TYPE, measured in bytes. */
1548 enum tree_code code
= TREE_CODE (type
);
1551 if (processing_template_decl
)
1552 return build_min (ALIGNOF_EXPR
, sizetype
, type
);
1554 if (code
== FUNCTION_TYPE
|| code
== METHOD_TYPE
)
1555 return size_int (FUNCTION_BOUNDARY
/ BITS_PER_UNIT
);
1557 if (code
== VOID_TYPE
|| code
== ERROR_MARK
)
1558 return size_int (1);
1560 /* C++: this is really correct! */
1561 if (code
== REFERENCE_TYPE
)
1562 type
= TREE_TYPE (type
);
1564 /* @@ This also produces an error for a signature ref.
1565 In that case we should be able to do better. */
1566 if (IS_SIGNATURE (type
))
1568 error ("`__alignof' applied to a signature type");
1569 return size_int (1);
1572 t
= size_int (TYPE_ALIGN (type
) / BITS_PER_UNIT
);
1573 force_fit_type (t
, 0);
1577 /* Perform default promotions for C data used in expressions.
1578 Arrays and functions are converted to pointers;
1579 enumeral types or short or char, to int.
1580 In addition, manifest constants symbols are replaced by their values.
1582 C++: this will automatically bash references to their target type. */
1585 decay_conversion (exp
)
1588 register tree type
= TREE_TYPE (exp
);
1589 register enum tree_code code
= TREE_CODE (type
);
1591 if (code
== OFFSET_TYPE
)
1593 if (TREE_CODE (exp
) == OFFSET_REF
)
1594 return decay_conversion (resolve_offset_ref (exp
));
1596 type
= TREE_TYPE (type
);
1597 code
= TREE_CODE (type
);
1599 if (type
== unknown_type_node
)
1601 cp_pedwarn ("assuming & on overloaded member function");
1602 return build_unary_op (ADDR_EXPR
, exp
, 0);
1606 if (code
== REFERENCE_TYPE
)
1608 exp
= convert_from_reference (exp
);
1609 type
= TREE_TYPE (exp
);
1610 code
= TREE_CODE (type
);
1613 /* Constants can be used directly unless they're not loadable. */
1614 if (TREE_CODE (exp
) == CONST_DECL
)
1615 exp
= DECL_INITIAL (exp
);
1616 /* Replace a nonvolatile const static variable with its value. */
1617 else if (TREE_READONLY_DECL_P (exp
))
1619 exp
= decl_constant_value (exp
);
1620 type
= TREE_TYPE (exp
);
1623 if (TREE_CODE (exp
) == NAMESPACE_DECL
)
1625 cp_error ("namespace `%D' used as expression", exp
);
1626 return error_mark_node
;
1629 /* build_c_cast puts on a NOP_EXPR to make the result not an lvalue.
1630 Leave such NOP_EXPRs, since RHS is being used in non-lvalue context. */
1632 if (code
== VOID_TYPE
)
1634 error ("void value not ignored as it ought to be");
1635 return error_mark_node
;
1637 if (code
== FUNCTION_TYPE
)
1639 return build_unary_op (ADDR_EXPR
, exp
, 0);
1641 if (code
== METHOD_TYPE
)
1643 cp_pedwarn ("assuming & on `%E'", exp
);
1644 return build_unary_op (ADDR_EXPR
, exp
, 0);
1646 if (code
== ARRAY_TYPE
)
1651 int constp
, volatilep
;
1653 if (TREE_CODE (exp
) == INDIRECT_REF
)
1655 /* Stripping away the INDIRECT_REF is not the right
1656 thing to do for references... */
1657 tree inner
= TREE_OPERAND (exp
, 0);
1658 if (TREE_CODE (TREE_TYPE (inner
)) == REFERENCE_TYPE
)
1660 inner
= build1 (CONVERT_EXPR
,
1661 build_pointer_type (TREE_TYPE
1662 (TREE_TYPE (inner
))),
1664 TREE_CONSTANT (inner
) = TREE_CONSTANT (TREE_OPERAND (inner
, 0));
1666 return cp_convert (build_pointer_type (TREE_TYPE (type
)), inner
);
1669 if (TREE_CODE (exp
) == COMPOUND_EXPR
)
1671 tree op1
= decay_conversion (TREE_OPERAND (exp
, 1));
1672 return build (COMPOUND_EXPR
, TREE_TYPE (op1
),
1673 TREE_OPERAND (exp
, 0), op1
);
1677 && ! (TREE_CODE (exp
) == CONSTRUCTOR
&& TREE_STATIC (exp
)))
1679 error ("invalid use of non-lvalue array");
1680 return error_mark_node
;
1683 constp
= volatilep
= 0;
1684 if (TREE_CODE_CLASS (TREE_CODE (exp
)) == 'r'
1685 || TREE_CODE_CLASS (TREE_CODE (exp
)) == 'd')
1687 constp
= TREE_READONLY (exp
);
1688 volatilep
= TREE_THIS_VOLATILE (exp
);
1691 restype
= TREE_TYPE (type
);
1692 if (TYPE_READONLY (type
) || TYPE_VOLATILE (type
)
1693 || constp
|| volatilep
)
1694 restype
= cp_build_type_variant (restype
,
1695 TYPE_READONLY (type
) || constp
,
1696 TYPE_VOLATILE (type
) || volatilep
);
1697 ptrtype
= build_pointer_type (restype
);
1699 if (TREE_CODE (exp
) == VAR_DECL
)
1701 /* ??? This is not really quite correct
1702 in that the type of the operand of ADDR_EXPR
1703 is not the target type of the type of the ADDR_EXPR itself.
1704 Question is, can this lossage be avoided? */
1705 adr
= build1 (ADDR_EXPR
, ptrtype
, exp
);
1706 if (mark_addressable (exp
) == 0)
1707 return error_mark_node
;
1708 TREE_CONSTANT (adr
) = staticp (exp
);
1709 TREE_SIDE_EFFECTS (adr
) = 0; /* Default would be, same as EXP. */
1712 /* This way is better for a COMPONENT_REF since it can
1713 simplify the offset for a component. */
1714 adr
= build_unary_op (ADDR_EXPR
, exp
, 1);
1715 return cp_convert (ptrtype
, adr
);
1722 default_conversion (exp
)
1726 enum tree_code code
;
1728 exp
= decay_conversion (exp
);
1730 type
= TREE_TYPE (exp
);
1731 code
= TREE_CODE (type
);
1733 if (INTEGRAL_CODE_P (code
))
1735 tree t
= type_promotes_to (type
);
1737 return cp_convert (t
, exp
);
1743 /* Take the address of an inline function without setting TREE_ADDRESSABLE
1747 inline_conversion (exp
)
1750 if (TREE_CODE (exp
) == FUNCTION_DECL
)
1752 tree type
= build_type_variant
1753 (TREE_TYPE (exp
), TREE_READONLY (exp
), TREE_THIS_VOLATILE (exp
));
1754 exp
= build1 (ADDR_EXPR
, build_pointer_type (type
), exp
);
1760 build_object_ref (datum
, basetype
, field
)
1761 tree datum
, basetype
, field
;
1764 if (datum
== error_mark_node
)
1765 return error_mark_node
;
1767 dtype
= TREE_TYPE (datum
);
1768 if (TREE_CODE (dtype
) == REFERENCE_TYPE
)
1769 dtype
= TREE_TYPE (dtype
);
1770 if (! IS_AGGR_TYPE_CODE (TREE_CODE (dtype
)))
1772 cp_error ("request for member `%T::%D' in expression of non-aggregate type `%T'",
1773 basetype
, field
, dtype
);
1774 return error_mark_node
;
1776 else if (IS_SIGNATURE (basetype
))
1778 warning ("signature name in scope resolution ignored");
1779 return build_component_ref (datum
, field
, NULL_TREE
, 1);
1781 else if (is_aggr_type (basetype
, 1))
1783 tree binfo
= binfo_or_else (basetype
, dtype
);
1785 return build_x_component_ref (build_scoped_ref (datum
, basetype
),
1788 return error_mark_node
;
1791 /* Like `build_component_ref, but uses an already found field, and converts
1792 from a reference. Must compute access for current_class_ref.
1796 build_component_ref_1 (datum
, field
, protect
)
1800 return convert_from_reference
1801 (build_component_ref (datum
, field
, NULL_TREE
, protect
));
1804 /* Given a COND_EXPR, MIN_EXPR, or MAX_EXPR in T, return it in a form that we
1805 can, for example, use as an lvalue. This code used to be in
1806 unary_complex_lvalue, but we needed it to deal with `a = (d == c) ? b : c'
1807 expressions, where we're dealing with aggregates. But now it's again only
1808 called from unary_complex_lvalue. The case (in particular) that led to
1809 this was with CODE == ADDR_EXPR, since it's not an lvalue when we'd
1813 rationalize_conditional_expr (code
, t
)
1814 enum tree_code code
;
1817 /* For MIN_EXPR or MAX_EXPR, fold-const.c has arranged things so that
1818 the first operand is always the one to be used if both operands
1819 are equal, so we know what conditional expression this used to be. */
1820 if (TREE_CODE (t
) == MIN_EXPR
|| TREE_CODE (t
) == MAX_EXPR
)
1823 build_conditional_expr (build_x_binary_op ((TREE_CODE (t
) == MIN_EXPR
1824 ? LE_EXPR
: GE_EXPR
),
1825 TREE_OPERAND (t
, 0),
1826 TREE_OPERAND (t
, 1)),
1827 build_unary_op (code
, TREE_OPERAND (t
, 0), 0),
1828 build_unary_op (code
, TREE_OPERAND (t
, 1), 0));
1832 build_conditional_expr (TREE_OPERAND (t
, 0),
1833 build_unary_op (code
, TREE_OPERAND (t
, 1), 0),
1834 build_unary_op (code
, TREE_OPERAND (t
, 2), 0));
1837 /* Given the TYPE of an anonymous union field inside T, return the
1838 FIELD_DECL for the field. If not found return NULL_TREE. Because
1839 anonymous unions can nest, we must also search all anonymous unions
1840 that are directly reachable. */
1843 lookup_anon_field (t
, type
)
1848 for (field
= TYPE_FIELDS (t
); field
; field
= TREE_CHAIN (field
))
1850 if (TREE_STATIC (field
))
1852 if (TREE_CODE (field
) != FIELD_DECL
)
1855 /* If we find it directly, return the field. */
1856 if (DECL_NAME (field
) == NULL_TREE
1857 && type
== TREE_TYPE (field
))
1862 /* Otherwise, it could be nested, search harder. */
1863 if (DECL_NAME (field
) == NULL_TREE
1864 && TREE_CODE (TREE_TYPE (field
)) == UNION_TYPE
)
1866 tree subfield
= lookup_anon_field (TREE_TYPE (field
), type
);
1874 /* Build a COMPONENT_REF for a given DATUM, and it's member COMPONENT.
1875 COMPONENT can be an IDENTIFIER_NODE that is the name of the member
1876 that we are interested in, or it can be a FIELD_DECL. */
1879 build_component_ref (datum
, component
, basetype_path
, protect
)
1880 tree datum
, component
, basetype_path
;
1883 register tree basetype
= TREE_TYPE (datum
);
1884 register enum tree_code code
;
1885 register tree field
= NULL
;
1888 if (processing_template_decl
)
1889 return build_min_nt (COMPONENT_REF
, datum
, component
);
1891 /* If DATUM is a COMPOUND_EXPR or COND_EXPR, move our reference
1893 switch (TREE_CODE (datum
))
1897 tree value
= build_component_ref (TREE_OPERAND (datum
, 1), component
,
1898 basetype_path
, protect
);
1899 return build (COMPOUND_EXPR
, TREE_TYPE (value
),
1900 TREE_OPERAND (datum
, 0), value
);
1903 return build_conditional_expr
1904 (TREE_OPERAND (datum
, 0),
1905 build_component_ref (TREE_OPERAND (datum
, 1), component
,
1906 basetype_path
, protect
),
1907 build_component_ref (TREE_OPERAND (datum
, 2), component
,
1908 basetype_path
, protect
));
1911 cp_error ("invalid use of %D", datum
);
1912 datum
= error_mark_node
;
1919 code
= TREE_CODE (basetype
);
1921 if (code
== REFERENCE_TYPE
)
1923 datum
= convert_from_reference (datum
);
1924 basetype
= TREE_TYPE (datum
);
1925 code
= TREE_CODE (basetype
);
1927 if (TREE_CODE (datum
) == OFFSET_REF
)
1929 datum
= resolve_offset_ref (datum
);
1930 basetype
= TREE_TYPE (datum
);
1931 code
= TREE_CODE (basetype
);
1934 /* First, see if there is a field or component with name COMPONENT. */
1935 if (TREE_CODE (component
) == TREE_LIST
)
1937 /* I could not trigger this code. MvL */
1938 my_friendly_abort (980326);
1940 my_friendly_assert (!(TREE_CHAIN (component
) == NULL_TREE
1941 && DECL_CHAIN (TREE_VALUE (component
)) == NULL_TREE
), 309);
1943 return build (COMPONENT_REF
, TREE_TYPE (component
), datum
, component
);
1946 if (! IS_AGGR_TYPE_CODE (code
))
1948 if (code
!= ERROR_MARK
)
1949 cp_error ("request for member `%D' in `%E', which is of non-aggregate type `%T'",
1950 component
, datum
, basetype
);
1951 return error_mark_node
;
1954 if (!complete_type_or_else (basetype
))
1955 return error_mark_node
;
1957 if (TREE_CODE (component
) == BIT_NOT_EXPR
)
1959 if (TYPE_IDENTIFIER (basetype
) != TREE_OPERAND (component
, 0))
1961 cp_error ("destructor specifier `%T::~%T' must have matching names",
1962 basetype
, TREE_OPERAND (component
, 0));
1963 return error_mark_node
;
1965 if (! TYPE_HAS_DESTRUCTOR (basetype
))
1967 cp_error ("type `%T' has no destructor", basetype
);
1968 return error_mark_node
;
1970 return TREE_VEC_ELT (CLASSTYPE_METHOD_VEC (basetype
), 1);
1973 /* Look up component name in the structure type definition. */
1974 if (CLASSTYPE_VFIELD (basetype
)
1975 && DECL_NAME (CLASSTYPE_VFIELD (basetype
)) == component
)
1976 /* Special-case this because if we use normal lookups in an ambiguous
1977 hierarchy, the compiler will abort (because vptr lookups are
1978 not supposed to be ambiguous. */
1979 field
= CLASSTYPE_VFIELD (basetype
);
1980 else if (TREE_CODE (component
) == FIELD_DECL
)
1982 else if (TREE_CODE (component
) == TYPE_DECL
)
1984 cp_pedwarn ("invalid use of type decl `%#D' as expression", component
);
1989 tree name
= component
;
1990 if (TREE_CODE (component
) == VAR_DECL
)
1991 name
= DECL_NAME (component
);
1992 if (basetype_path
== NULL_TREE
)
1993 basetype_path
= TYPE_BINFO (basetype
);
1994 field
= lookup_field (basetype_path
, name
,
1995 protect
&& !VFIELD_NAME_P (name
), 0);
1996 if (field
== error_mark_node
)
1997 return error_mark_node
;
1999 if (field
== NULL_TREE
)
2001 /* Not found as a data field, look for it as a method. If found,
2002 then if this is the only possible one, return it, else
2003 report ambiguity error. */
2004 tree fndecls
= lookup_fnfields (basetype_path
, name
, 1);
2005 if (fndecls
== error_mark_node
)
2006 return error_mark_node
;
2009 if (TREE_CHAIN (fndecls
) == NULL_TREE
2010 && TREE_CODE (TREE_VALUE (fndecls
)) != OVERLOAD
)
2012 tree access
, fndecl
;
2014 /* Unique, so use this one now. */
2015 basetype
= TREE_PURPOSE (fndecls
);
2016 fndecl
= TREE_VALUE (fndecls
);
2017 access
= compute_access (TREE_PURPOSE (fndecls
), fndecl
);
2018 if (access
== access_public_node
)
2020 if (DECL_VINDEX (fndecl
)
2021 && ! resolves_to_fixed_type_p (datum
, 0))
2023 tree addr
= build_unary_op (ADDR_EXPR
, datum
, 0);
2024 tree fntype
= TREE_TYPE (fndecl
);
2026 addr
= convert_pointer_to (DECL_CONTEXT (fndecl
),
2028 datum
= build_indirect_ref (addr
, NULL_PTR
);
2029 my_friendly_assert (datum
!= error_mark_node
, 310);
2030 fndecl
= build_vfn_ref (&addr
, datum
,
2031 DECL_VINDEX (fndecl
));
2032 /* The type of fndecl is a function type,
2033 not a pointer-to-function type, since
2034 build_vfn_ref returns not the correct
2035 vtable slot, but the indirection of the
2036 correct vtable slot. */
2037 TREE_TYPE (fndecl
) = fntype
;
2041 return build (OFFSET_REF
, TREE_TYPE (fndecl
),
2044 if (access
== access_protected_node
)
2045 cp_error ("member function `%D' is protected", fndecl
);
2047 cp_error ("member function `%D' is private", fndecl
);
2048 return error_mark_node
;
2052 /* Just act like build_offset_ref, since the object does
2053 not matter unless we're actually calling the function. */
2056 t
= build_tree_list (error_mark_node
, fndecls
);
2057 TREE_TYPE (t
) = build_offset_type (basetype
,
2063 cp_error ("`%#T' has no member named `%D'", basetype
, name
);
2064 return error_mark_node
;
2066 else if (TREE_TYPE (field
) == error_mark_node
)
2067 return error_mark_node
;
2069 if (TREE_CODE (field
) != FIELD_DECL
)
2071 if (TREE_CODE (field
) == TYPE_DECL
)
2072 cp_pedwarn ("invalid use of type decl `%#D' as expression", field
);
2073 else if (DECL_RTL (field
) != 0)
2076 TREE_USED (field
) = 1;
2081 /* See if we have to do any conversions so that we pick up the field from the
2083 if (DECL_FIELD_CONTEXT (field
) != basetype
)
2085 tree context
= DECL_FIELD_CONTEXT (field
);
2086 tree base
= context
;
2087 while (!comptypes (base
, basetype
,1) && TYPE_NAME (base
)
2088 && ANON_UNION_TYPE_P (base
))
2090 base
= TYPE_CONTEXT (base
);
2093 /* Handle base classes here... */
2094 if (base
!= basetype
&& TYPE_USES_COMPLEX_INHERITANCE (basetype
))
2096 tree addr
= build_unary_op (ADDR_EXPR
, datum
, 0);
2097 if (integer_zerop (addr
))
2099 error ("invalid reference to NULL ptr, use ptr-to-member instead");
2100 return error_mark_node
;
2102 if (VBASE_NAME_P (DECL_NAME (field
)))
2104 /* It doesn't matter which vbase pointer we grab, just
2105 find one of them. */
2106 tree binfo
= get_binfo (base
,
2107 TREE_TYPE (TREE_TYPE (addr
)), 0);
2108 addr
= convert_pointer_to_real (binfo
, addr
);
2111 addr
= convert_pointer_to (base
, addr
);
2112 datum
= build_indirect_ref (addr
, NULL_PTR
);
2113 my_friendly_assert (datum
!= error_mark_node
, 311);
2117 /* Handle things from anon unions here... */
2118 if (TYPE_NAME (context
) && ANON_UNION_TYPE_P (context
))
2120 tree subfield
= lookup_anon_field (basetype
, context
);
2121 tree subdatum
= build_component_ref (datum
, subfield
,
2122 basetype_path
, protect
);
2123 return build_component_ref (subdatum
, field
, basetype_path
, protect
);
2127 ref
= fold (build (COMPONENT_REF
, TREE_TYPE (field
),
2128 break_out_cleanups (datum
), field
));
2130 if (TREE_READONLY (datum
) || TREE_READONLY (field
))
2131 TREE_READONLY (ref
) = 1;
2132 if (TREE_THIS_VOLATILE (datum
) || TREE_THIS_VOLATILE (field
))
2133 TREE_THIS_VOLATILE (ref
) = 1;
2134 if (DECL_LANG_SPECIFIC (field
) && DECL_MUTABLE_P (field
))
2135 TREE_READONLY (ref
) = 0;
2140 /* Variant of build_component_ref for use in expressions, which should
2141 never have REFERENCE_TYPE. */
2144 build_x_component_ref (datum
, component
, basetype_path
, protect
)
2145 tree datum
, component
, basetype_path
;
2148 tree t
= build_component_ref (datum
, component
, basetype_path
, protect
);
2150 if (! processing_template_decl
)
2151 t
= convert_from_reference (t
);
2156 /* Given an expression PTR for a pointer, return an expression
2157 for the value pointed to.
2158 ERRORSTRING is the name of the operator to appear in error messages.
2160 This function may need to overload OPERATOR_FNNAME.
2161 Must also handle REFERENCE_TYPEs for C++. */
2164 build_x_indirect_ref (ptr
, errorstring
)
2170 if (processing_template_decl
)
2171 return build_min_nt (INDIRECT_REF
, ptr
);
2173 rval
= build_opfncall (INDIRECT_REF
, LOOKUP_NORMAL
, ptr
, NULL_TREE
,
2177 return build_indirect_ref (ptr
, errorstring
);
2181 build_indirect_ref (ptr
, errorstring
)
2185 register tree pointer
, type
;
2187 if (ptr
== error_mark_node
)
2188 return error_mark_node
;
2190 pointer
= (TREE_CODE (TREE_TYPE (ptr
)) == REFERENCE_TYPE
2191 ? ptr
: default_conversion (ptr
));
2192 type
= TREE_TYPE (pointer
);
2194 if (ptr
== current_class_ptr
)
2195 return current_class_ref
;
2197 if (TREE_CODE (type
) == POINTER_TYPE
|| TREE_CODE (type
) == REFERENCE_TYPE
)
2199 if (TREE_CODE (pointer
) == ADDR_EXPR
2201 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_OPERAND (pointer
, 0)))
2202 == TYPE_MAIN_VARIANT (TREE_TYPE (type
)))
2203 && (TREE_READONLY (TREE_OPERAND (pointer
, 0))
2204 == TYPE_READONLY (TREE_TYPE (type
)))
2205 && (TREE_THIS_VOLATILE (TREE_OPERAND (pointer
, 0))
2206 == TYPE_VOLATILE (TREE_TYPE (type
))))
2207 return TREE_OPERAND (pointer
, 0);
2210 tree t
= TREE_TYPE (type
);
2211 register tree ref
= build1 (INDIRECT_REF
,
2212 TYPE_MAIN_VARIANT (t
), pointer
);
2214 /* We *must* set TREE_READONLY when dereferencing a pointer to const,
2215 so that we get the proper error message if the result is used
2216 to assign to. Also, &* is supposed to be a no-op. */
2217 TREE_READONLY (ref
) = TYPE_READONLY (t
);
2218 TREE_SIDE_EFFECTS (ref
)
2219 = (TYPE_VOLATILE (t
) || TREE_SIDE_EFFECTS (pointer
)
2221 TREE_THIS_VOLATILE (ref
) = TYPE_VOLATILE (t
);
2225 /* `pointer' won't be an error_mark_node if we were given a
2226 pointer to member, so it's cool to check for this here. */
2227 else if (TYPE_PTRMEMFUNC_P (type
))
2228 error ("invalid use of `%s' on pointer to member function", errorstring
);
2229 else if (TREE_CODE (type
) == RECORD_TYPE
2230 && (IS_SIGNATURE_POINTER (type
) || IS_SIGNATURE_REFERENCE (type
)))
2231 error ("cannot dereference signature pointer/reference");
2232 else if (pointer
!= error_mark_node
)
2235 error ("invalid type argument of `%s'", errorstring
);
2237 error ("invalid type argument");
2239 return error_mark_node
;
2242 /* This handles expressions of the form "a[i]", which denotes
2245 This is logically equivalent in C to *(a+i), but we may do it differently.
2246 If A is a variable or a member, we generate a primitive ARRAY_REF.
2247 This avoids forcing the array out of registers, and can work on
2248 arrays that are not lvalues (for example, members of structures returned
2251 If INDEX is of some user-defined type, it must be converted to
2252 integer type. Otherwise, to make a compatible PLUS_EXPR, it
2253 will inherit the type of the array, which will be some pointer type. */
2256 build_array_ref (array
, idx
)
2261 error ("subscript missing in array reference");
2262 return error_mark_node
;
2265 if (TREE_TYPE (array
) == error_mark_node
2266 || TREE_TYPE (idx
) == error_mark_node
)
2267 return error_mark_node
;
2269 if (TREE_CODE (TREE_TYPE (array
)) == ARRAY_TYPE
2270 && TREE_CODE (array
) != INDIRECT_REF
)
2274 /* Subscripting with type char is likely to lose
2275 on a machine where chars are signed.
2276 So warn on any machine, but optionally.
2277 Don't warn for unsigned char since that type is safe.
2278 Don't warn for signed char because anyone who uses that
2279 must have done so deliberately. */
2280 if (warn_char_subscripts
2281 && TYPE_MAIN_VARIANT (TREE_TYPE (idx
)) == char_type_node
)
2282 warning ("array subscript has type `char'");
2284 /* Apply default promotions *after* noticing character types. */
2285 idx
= default_conversion (idx
);
2287 if (TREE_CODE (TREE_TYPE (idx
)) != INTEGER_TYPE
)
2289 error ("array subscript is not an integer");
2290 return error_mark_node
;
2293 /* An array that is indexed by a non-constant
2294 cannot be stored in a register; we must be able to do
2295 address arithmetic on its address.
2296 Likewise an array of elements of variable size. */
2297 if (TREE_CODE (idx
) != INTEGER_CST
2298 || (TYPE_SIZE (TREE_TYPE (TREE_TYPE (array
))) != 0
2299 && (TREE_CODE (TYPE_SIZE (TREE_TYPE (TREE_TYPE (array
))))
2302 if (mark_addressable (array
) == 0)
2303 return error_mark_node
;
2305 /* An array that is indexed by a constant value which is not within
2306 the array bounds cannot be stored in a register either; because we
2307 would get a crash in store_bit_field/extract_bit_field when trying
2308 to access a non-existent part of the register. */
2309 if (TREE_CODE (idx
) == INTEGER_CST
2310 && TYPE_VALUES (TREE_TYPE (array
))
2311 && ! int_fits_type_p (idx
, TYPE_VALUES (TREE_TYPE (array
))))
2313 if (mark_addressable (array
) == 0)
2314 return error_mark_node
;
2317 if (pedantic
&& !lvalue_p (array
))
2318 pedwarn ("ANSI C++ forbids subscripting non-lvalue array");
2320 /* Note in C++ it is valid to subscript a `register' array, since
2321 it is valid to take the address of something with that
2322 storage specification. */
2326 while (TREE_CODE (foo
) == COMPONENT_REF
)
2327 foo
= TREE_OPERAND (foo
, 0);
2328 if (TREE_CODE (foo
) == VAR_DECL
&& DECL_REGISTER (foo
))
2329 warning ("subscripting array declared `register'");
2332 type
= TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (array
)));
2333 rval
= build (ARRAY_REF
, type
, array
, idx
);
2334 /* Array ref is const/volatile if the array elements are
2335 or if the array is.. */
2336 TREE_READONLY (rval
)
2337 |= (TYPE_READONLY (TREE_TYPE (TREE_TYPE (array
)))
2338 | TREE_READONLY (array
));
2339 TREE_SIDE_EFFECTS (rval
)
2340 |= (TYPE_VOLATILE (TREE_TYPE (TREE_TYPE (array
)))
2341 | TREE_SIDE_EFFECTS (array
));
2342 TREE_THIS_VOLATILE (rval
)
2343 |= (TYPE_VOLATILE (TREE_TYPE (TREE_TYPE (array
)))
2344 /* This was added by rms on 16 Nov 91.
2345 It fixes vol struct foo *a; a->elts[1]
2346 in an inline function.
2347 Hope it doesn't break something else. */
2348 | TREE_THIS_VOLATILE (array
));
2349 return require_complete_type (fold (rval
));
2353 tree ar
= default_conversion (array
);
2354 tree ind
= default_conversion (idx
);
2356 /* Put the integer in IND to simplify error checking. */
2357 if (TREE_CODE (TREE_TYPE (ar
)) == INTEGER_TYPE
)
2364 if (ar
== error_mark_node
)
2367 if (TREE_CODE (TREE_TYPE (ar
)) != POINTER_TYPE
)
2369 error ("subscripted value is neither array nor pointer");
2370 return error_mark_node
;
2372 if (TREE_CODE (TREE_TYPE (ind
)) != INTEGER_TYPE
)
2374 error ("array subscript is not an integer");
2375 return error_mark_node
;
2378 return build_indirect_ref (build_binary_op_nodefault (PLUS_EXPR
, ar
,
2384 /* Build a function call to function FUNCTION with parameters PARAMS.
2385 PARAMS is a list--a chain of TREE_LIST nodes--in which the
2386 TREE_VALUE of each node is a parameter-expression. The PARAMS do
2387 not include any object pointer that may be required. FUNCTION's
2388 data type may be a function type or a pointer-to-function.
2390 For C++: If FUNCTION's data type is a TREE_LIST, then the tree list
2391 is the list of possible methods that FUNCTION could conceivably
2392 be. If the list of methods comes from a class, then it will be
2393 a list of lists (where each element is associated with the class
2394 that produced it), otherwise it will be a simple list (for
2395 functions overloaded in global scope).
2397 In the first case, TREE_VALUE (function) is the head of one of those
2398 lists, and TREE_PURPOSE is the name of the function.
2400 In the second case, TREE_PURPOSE (function) is the function's
2403 DECL is the class instance variable, usually CURRENT_CLASS_REF.
2405 When calling a TEMPLATE_DECL, we don't require a complete return
2409 build_x_function_call (function
, params
, decl
)
2410 tree function
, params
, decl
;
2413 tree template_id
= NULL_TREE
;
2416 if (function
== error_mark_node
)
2417 return error_mark_node
;
2419 if (processing_template_decl
)
2420 return build_min_nt (CALL_EXPR
, function
, params
, NULL_TREE
);
2422 /* Save explicit template arguments if found */
2423 if (TREE_CODE (function
) == TEMPLATE_ID_EXPR
)
2425 template_id
= function
;
2426 function
= TREE_OPERAND (function
, 0);
2429 type
= TREE_TYPE (function
);
2431 if (TREE_CODE (type
) == OFFSET_TYPE
2432 && TREE_TYPE (type
) == unknown_type_node
2433 && TREE_CODE (function
) == TREE_LIST
2434 && TREE_CHAIN (function
) == NULL_TREE
)
2436 /* Undo (Foo:bar)()... */
2437 type
= TYPE_OFFSET_BASETYPE (type
);
2438 function
= TREE_VALUE (function
);
2439 my_friendly_assert (TREE_CODE (function
) == TREE_LIST
, 999);
2440 my_friendly_assert (TREE_CHAIN (function
) == NULL_TREE
, 999);
2441 function
= TREE_VALUE (function
);
2442 my_friendly_assert (TREE_CODE (function
) == FUNCTION_DECL
, 999);
2443 function
= DECL_NAME (function
);
2444 return build_method_call (decl
, function
, params
,
2445 TYPE_BINFO (type
), LOOKUP_NORMAL
);
2448 is_method
= ((TREE_CODE (function
) == TREE_LIST
2449 && current_class_type
!= NULL_TREE
2450 && (IDENTIFIER_CLASS_VALUE (TREE_PURPOSE (function
))
2452 || TREE_CODE (function
) == IDENTIFIER_NODE
2453 || TREE_CODE (type
) == METHOD_TYPE
2454 || TYPE_PTRMEMFUNC_P (type
));
2456 if ((TREE_CODE (function
) == FUNCTION_DECL
2457 && DECL_STATIC_FUNCTION_P (function
))
2458 || (TREE_CODE (function
) == TEMPLATE_DECL
2459 && DECL_STATIC_FUNCTION_P (DECL_RESULT (function
))))
2460 return build_member_call
2461 (DECL_CONTEXT (function
), DECL_NAME (function
), params
);
2463 /* A friend template. Make it look like a toplevel declaration. */
2464 if (! is_method
&& TREE_CODE (function
) == TEMPLATE_DECL
)
2465 function
= scratch_ovl_cons (function
, NULL_TREE
);
2467 /* Handle methods, friends, and overloaded functions, respectively. */
2470 tree basetype
= NULL_TREE
;
2472 if (TREE_CODE (function
) == FUNCTION_DECL
2473 || DECL_FUNCTION_TEMPLATE_P (function
))
2475 basetype
= DECL_CLASS_CONTEXT (function
);
2477 if (DECL_NAME (function
))
2478 function
= DECL_NAME (function
);
2480 function
= TYPE_IDENTIFIER (DECL_CLASS_CONTEXT (function
));
2482 else if (TREE_CODE (function
) == TREE_LIST
)
2484 my_friendly_assert (TREE_CODE (TREE_VALUE (function
))
2485 == FUNCTION_DECL
, 312);
2486 basetype
= DECL_CLASS_CONTEXT (TREE_VALUE (function
));
2487 function
= TREE_PURPOSE (function
);
2489 else if (TREE_CODE (function
) != IDENTIFIER_NODE
)
2491 if (TREE_CODE (function
) == OFFSET_REF
)
2493 if (TREE_OPERAND (function
, 0))
2494 decl
= TREE_OPERAND (function
, 0);
2496 /* Call via a pointer to member function. */
2497 if (decl
== NULL_TREE
)
2499 error ("pointer to member function called, but not in class scope");
2500 return error_mark_node
;
2502 /* What other type of POINTER_TYPE could this be? */
2503 if (TREE_CODE (TREE_TYPE (function
)) != POINTER_TYPE
2504 && ! TYPE_PTRMEMFUNC_P (TREE_TYPE (function
))
2505 && TREE_CODE (function
) != OFFSET_REF
)
2506 function
= build (OFFSET_REF
, TREE_TYPE (type
), NULL_TREE
,
2511 /* this is an abbreviated method call.
2512 must go through here in case it is a virtual function.
2513 @@ Perhaps this could be optimized. */
2515 if (basetype
&& (! current_class_type
2516 || ! DERIVED_FROM_P (basetype
, current_class_type
)))
2517 return build_member_call (basetype
, function
, params
);
2519 if (decl
== NULL_TREE
)
2521 if (current_class_type
== NULL_TREE
)
2523 error ("object missing in call to method `%s'",
2524 IDENTIFIER_POINTER (function
));
2525 return error_mark_node
;
2527 /* Yow: call from a static member function. */
2528 decl
= build1 (NOP_EXPR
, build_pointer_type (current_class_type
),
2530 decl
= build_indirect_ref (decl
, NULL_PTR
);
2533 /* Put back explicit template arguments, if any. */
2535 function
= template_id
;
2536 return build_method_call (decl
, function
, params
,
2537 NULL_TREE
, LOOKUP_NORMAL
);
2539 else if (TREE_CODE (function
) == COMPONENT_REF
2540 && type
== unknown_type_node
)
2542 /* Should we undo what was done in build_component_ref? */
2543 if (TREE_CODE (TREE_PURPOSE (TREE_OPERAND (function
, 1))) == TREE_VEC
)
2544 /* Get the name that build_component_ref hid. */
2545 function
= DECL_NAME (TREE_VALUE (TREE_OPERAND (function
, 1)));
2547 function
= TREE_PURPOSE (TREE_OPERAND (function
, 1));
2548 return build_method_call (decl
, function
, params
,
2549 NULL_TREE
, LOOKUP_NORMAL
);
2551 else if (really_overloaded_fn (function
))
2553 if (OVL_FUNCTION (function
) == NULL_TREE
)
2555 cp_error ("function `%D' declared overloaded, but no definitions appear with which to resolve it?!?",
2556 TREE_PURPOSE (function
));
2557 return error_mark_node
;
2561 /* Put back explicit template arguments, if any. */
2563 function
= template_id
;
2564 return build_new_function_call (function
, params
);
2568 /* Remove a potential OVERLOAD around it */
2569 function
= OVL_CURRENT (function
);
2572 if (TREE_CODE (function
) == OFFSET_REF
)
2574 /* If the component is a data element (or a virtual function), we play
2575 games here to make things work. */
2578 if (TREE_OPERAND (function
, 0))
2579 decl
= TREE_OPERAND (function
, 0);
2581 decl
= current_class_ref
;
2583 decl_addr
= build_unary_op (ADDR_EXPR
, decl
, 0);
2585 /* Sigh. OFFSET_REFs are being used for too many things.
2586 They're being used both for -> and ->*, and we want to resolve
2587 the -> cases here, but leave the ->*. We could use
2588 resolve_offset_ref for those, too, but it would call
2589 get_member_function_from_ptrfunc and decl_addr wouldn't get
2590 updated properly. Nasty. */
2591 if (TREE_CODE (TREE_OPERAND (function
, 1)) == FIELD_DECL
)
2592 function
= resolve_offset_ref (function
);
2594 function
= TREE_OPERAND (function
, 1);
2596 function
= get_member_function_from_ptrfunc (&decl_addr
, function
);
2597 params
= expr_tree_cons (NULL_TREE
, decl_addr
, params
);
2598 return build_function_call (function
, params
);
2601 type
= TREE_TYPE (function
);
2602 if (type
!= error_mark_node
)
2604 if (TREE_CODE (type
) == REFERENCE_TYPE
)
2605 type
= TREE_TYPE (type
);
2607 if (IS_AGGR_TYPE (type
))
2608 return build_opfncall (CALL_EXPR
, LOOKUP_NORMAL
, function
, params
, NULL_TREE
);
2613 tree fntype
= TREE_TYPE (function
);
2614 tree ctypeptr
= NULL_TREE
;
2616 /* Explicitly named method? */
2617 if (TREE_CODE (function
) == FUNCTION_DECL
)
2618 ctypeptr
= build_pointer_type (DECL_CLASS_CONTEXT (function
));
2619 /* Expression with ptr-to-method type? It could either be a plain
2620 usage, or it might be a case where the ptr-to-method is being
2621 passed in as an argument. */
2622 else if (TYPE_PTRMEMFUNC_P (fntype
))
2624 tree rec
= TYPE_METHOD_BASETYPE (TREE_TYPE
2625 (TYPE_PTRMEMFUNC_FN_TYPE (fntype
)));
2626 ctypeptr
= build_pointer_type (rec
);
2628 /* Unexpected node type? */
2630 my_friendly_abort (116);
2631 if (decl
== NULL_TREE
)
2633 if (current_function_decl
2634 && DECL_STATIC_FUNCTION_P (current_function_decl
))
2635 error ("invalid call to member function needing `this' in static member function scope");
2637 error ("pointer to member function called, but not in class scope");
2638 return error_mark_node
;
2640 if (TREE_CODE (TREE_TYPE (decl
)) != POINTER_TYPE
2641 && ! TYPE_PTRMEMFUNC_P (TREE_TYPE (decl
)))
2643 decl
= build_unary_op (ADDR_EXPR
, decl
, 0);
2644 decl
= convert_pointer_to (TREE_TYPE (ctypeptr
), decl
);
2647 decl
= build_c_cast (ctypeptr
, decl
);
2648 params
= expr_tree_cons (NULL_TREE
, decl
, params
);
2651 return build_function_call (function
, params
);
2654 /* Resolve a pointer to member function. INSTANCE is the object
2655 instance to use, if the member points to a virtual member. */
2658 get_member_function_from_ptrfunc (instance_ptrptr
, function
)
2659 tree
*instance_ptrptr
;
2662 if (TREE_CODE (function
) == OFFSET_REF
)
2664 function
= TREE_OPERAND (function
, 1);
2667 if (TYPE_PTRMEMFUNC_P (TREE_TYPE (function
)))
2669 tree fntype
, idx
, e1
, delta
, delta2
, e2
, e3
, aref
, vtbl
;
2672 tree instance_ptr
= *instance_ptrptr
;
2674 if (TREE_SIDE_EFFECTS (instance_ptr
))
2675 instance_ptr
= save_expr (instance_ptr
);
2677 if (TREE_SIDE_EFFECTS (function
))
2678 function
= save_expr (function
);
2680 fntype
= TYPE_PTRMEMFUNC_FN_TYPE (TREE_TYPE (function
));
2682 /* Promoting idx before saving it improves performance on RISC
2683 targets. Without promoting, the first compare used
2684 load-with-sign-extend, while the second used normal load then
2685 shift to sign-extend. An optimizer flaw, perhaps, but it's easier
2686 to make this change. */
2687 idx
= save_expr (default_conversion
2688 (build_component_ref (function
,
2691 e1
= build_binary_op (GT_EXPR
, idx
, integer_zero_node
, 1);
2692 delta
= cp_convert (ptrdiff_type_node
,
2693 build_component_ref (function
, delta_identifier
,
2695 delta2
= DELTA2_FROM_PTRMEMFUNC (function
);
2697 /* Convert down to the right base, before using the instance. */
2699 = convert_pointer_to_real (TYPE_METHOD_BASETYPE (TREE_TYPE (fntype
)),
2701 if (instance
== error_mark_node
&& instance_ptr
!= error_mark_node
)
2704 vtbl
= convert_pointer_to (ptr_type_node
, instance
);
2707 build_pointer_type (build_pointer_type (vtable_entry_type
)),
2708 vtbl
, cp_convert (ptrdiff_type_node
, delta2
));
2709 vtbl
= build_indirect_ref (vtbl
, NULL_PTR
);
2710 aref
= build_array_ref (vtbl
, build_binary_op (MINUS_EXPR
,
2712 integer_one_node
, 1));
2713 if (! flag_vtable_thunks
)
2715 aref
= save_expr (aref
);
2717 delta
= build_binary_op
2719 build_conditional_expr (e1
, build_component_ref (aref
,
2726 *instance_ptrptr
= build (PLUS_EXPR
, TREE_TYPE (instance_ptr
),
2727 instance_ptr
, delta
);
2728 if (flag_vtable_thunks
)
2731 e2
= build_component_ref (aref
, pfn_identifier
, NULL_TREE
, 0);
2733 e3
= PFN_FROM_PTRMEMFUNC (function
);
2734 TREE_TYPE (e2
) = TREE_TYPE (e3
);
2735 e1
= build_conditional_expr (e1
, e2
, e3
);
2737 if (instance_ptr
== error_mark_node
2738 && TREE_CODE (e1
) != ADDR_EXPR
2739 && TREE_CODE (TREE_OPERAND (e1
, 0)) != FUNCTION_DECL
)
2740 cp_error ("object missing in `%E'", function
);
2744 /* Make sure this doesn't get evaluated first inside one of the
2745 branches of the COND_EXPR. */
2746 if (TREE_CODE (instance_ptr
) == SAVE_EXPR
)
2747 function
= build (COMPOUND_EXPR
, TREE_TYPE (function
),
2748 instance_ptr
, function
);
2754 build_function_call_real (function
, params
, require_complete
, flags
)
2755 tree function
, params
;
2756 int require_complete
, flags
;
2758 register tree fntype
, fndecl
;
2759 register tree value_type
;
2760 register tree coerced_params
;
2761 tree name
= NULL_TREE
, assembler_name
= NULL_TREE
;
2764 /* build_c_cast puts on a NOP_EXPR to make the result not an lvalue.
2765 Strip such NOP_EXPRs, since FUNCTION is used in non-lvalue context. */
2766 if (TREE_CODE (function
) == NOP_EXPR
2767 && TREE_TYPE (function
) == TREE_TYPE (TREE_OPERAND (function
, 0)))
2768 function
= TREE_OPERAND (function
, 0);
2770 if (TREE_CODE (function
) == FUNCTION_DECL
)
2772 name
= DECL_NAME (function
);
2773 assembler_name
= DECL_ASSEMBLER_NAME (function
);
2775 GNU_xref_call (current_function_decl
,
2776 IDENTIFIER_POINTER (name
? name
2777 : TYPE_IDENTIFIER (DECL_CLASS_CONTEXT
2779 mark_used (function
);
2782 /* Convert anything with function type to a pointer-to-function. */
2783 if (pedantic
&& DECL_MAIN_P (function
))
2784 pedwarn ("ANSI C++ forbids calling `main' from within program");
2786 /* Differs from default_conversion by not setting TREE_ADDRESSABLE
2787 (because calling an inline function does not mean the function
2788 needs to be separately compiled). */
2790 if (DECL_INLINE (function
))
2791 function
= inline_conversion (function
);
2793 function
= build_addr_func (function
);
2799 function
= build_addr_func (function
);
2802 if (function
== error_mark_node
)
2803 return error_mark_node
;
2805 fntype
= TREE_TYPE (function
);
2807 if (TYPE_PTRMEMFUNC_P (fntype
))
2809 cp_error ("must use .* or ->* to call pointer-to-member function in `%E (...)'",
2811 return error_mark_node
;
2814 is_method
= (TREE_CODE (fntype
) == POINTER_TYPE
2815 && TREE_CODE (TREE_TYPE (fntype
)) == METHOD_TYPE
);
2817 if (!((TREE_CODE (fntype
) == POINTER_TYPE
2818 && TREE_CODE (TREE_TYPE (fntype
)) == FUNCTION_TYPE
)
2820 || TREE_CODE (function
) == TEMPLATE_ID_EXPR
))
2822 cp_error ("`%E' cannot be used as a function", function
);
2823 return error_mark_node
;
2826 /* fntype now gets the type of function pointed to. */
2827 fntype
= TREE_TYPE (fntype
);
2829 /* Convert the parameters to the types declared in the
2830 function prototype, or apply default promotions. */
2832 if (flags
& LOOKUP_COMPLAIN
)
2833 coerced_params
= convert_arguments (NULL_TREE
, TYPE_ARG_TYPES (fntype
),
2834 params
, fndecl
, LOOKUP_NORMAL
);
2836 coerced_params
= convert_arguments (NULL_TREE
, TYPE_ARG_TYPES (fntype
),
2839 if (coerced_params
== error_mark_node
)
2841 if (flags
& LOOKUP_SPECULATIVELY
)
2844 return error_mark_node
;
2847 /* Check for errors in format strings. */
2849 if (warn_format
&& (name
|| assembler_name
))
2850 check_function_format (name
, assembler_name
, coerced_params
);
2852 /* Recognize certain built-in functions so we can make tree-codes
2853 other than CALL_EXPR. We do this when it enables fold-const.c
2854 to do something useful. */
2856 if (TREE_CODE (function
) == ADDR_EXPR
2857 && TREE_CODE (TREE_OPERAND (function
, 0)) == FUNCTION_DECL
2858 && DECL_BUILT_IN (TREE_OPERAND (function
, 0)))
2859 switch (DECL_FUNCTION_CODE (TREE_OPERAND (function
, 0)))
2864 if (coerced_params
== 0)
2865 return integer_zero_node
;
2866 return build_unary_op (ABS_EXPR
, TREE_VALUE (coerced_params
), 0);
2873 value_type
= TREE_TYPE (fntype
) ? TREE_TYPE (fntype
) : void_type_node
;
2875 register tree result
2876 = build_call (function
, value_type
, coerced_params
);
2878 if (require_complete
)
2880 if (value_type
== void_type_node
)
2882 result
= require_complete_type (result
);
2884 if (IS_AGGR_TYPE (value_type
))
2885 result
= build_cplus_new (value_type
, result
);
2886 return convert_from_reference (result
);
2891 build_function_call (function
, params
)
2892 tree function
, params
;
2894 return build_function_call_real (function
, params
, 1, LOOKUP_NORMAL
);
2897 /* Convert the actual parameter expressions in the list VALUES
2898 to the types in the list TYPELIST.
2899 If parmdecls is exhausted, or when an element has NULL as its type,
2900 perform the default conversions.
2902 RETURN_LOC is the location of the return value, if known, NULL_TREE
2903 otherwise. This is useful in the case where we can avoid creating
2904 a temporary variable in the case where we can initialize the return
2905 value directly. If we are not eliding constructors, then we set this
2906 to NULL_TREE to avoid this avoidance.
2908 NAME is an IDENTIFIER_NODE or 0. It is used only for error messages.
2910 This is also where warnings about wrong number of args are generated.
2912 Return a list of expressions for the parameters as converted.
2914 Both VALUES and the returned value are chains of TREE_LIST nodes
2915 with the elements of the list in the TREE_VALUE slots of those nodes.
2917 In C++, unspecified trailing parameters can be filled in with their
2918 default arguments, if such were specified. Do so here. */
2921 convert_arguments (return_loc
, typelist
, values
, fndecl
, flags
)
2922 tree return_loc
, typelist
, values
, fndecl
;
2925 register tree typetail
, valtail
;
2926 register tree result
= NULL_TREE
;
2927 char *called_thing
= 0;
2930 if (! flag_elide_constructors
)
2933 /* Argument passing is always copy-initialization. */
2934 flags
|= LOOKUP_ONLYCONVERTING
;
2938 if (TREE_CODE (TREE_TYPE (fndecl
)) == METHOD_TYPE
)
2940 if (DECL_NAME (fndecl
) == NULL_TREE
2941 || IDENTIFIER_HAS_TYPE_VALUE (DECL_NAME (fndecl
)))
2942 called_thing
= "constructor";
2944 called_thing
= "member function";
2947 called_thing
= "function";
2950 for (valtail
= values
, typetail
= typelist
;
2952 valtail
= TREE_CHAIN (valtail
), i
++)
2954 register tree type
= typetail
? TREE_VALUE (typetail
) : 0;
2955 register tree val
= TREE_VALUE (valtail
);
2957 if (val
== error_mark_node
)
2958 return error_mark_node
;
2960 if (type
== void_type_node
)
2964 cp_error_at ("too many arguments to %s `%+D'", called_thing
,
2966 error ("at this point in file");
2969 error ("too many arguments to function");
2970 /* In case anybody wants to know if this argument
2973 TREE_TYPE (tree_last (result
)) = error_mark_node
;
2977 /* The tree type of the parameter being passed may not yet be
2978 known. In this case, its type is TYPE_UNKNOWN, and will
2979 be instantiated by the type given by TYPE. If TYPE
2980 is also NULL, the tree type of VAL is ERROR_MARK_NODE. */
2981 if (type
&& type_unknown_p (val
))
2982 val
= require_instantiated_type (type
, val
, integer_zero_node
);
2983 else if (type_unknown_p (val
))
2985 /* Strip the `&' from an overloaded FUNCTION_DECL. */
2986 if (TREE_CODE (val
) == ADDR_EXPR
)
2987 val
= TREE_OPERAND (val
, 0);
2988 if (really_overloaded_fn (val
))
2989 cp_error ("insufficient type information to resolve address of overloaded function `%D'",
2990 DECL_NAME (get_first_fn (val
)));
2992 error ("insufficient type information in parameter list");
2993 val
= integer_zero_node
;
2995 else if (TREE_CODE (val
) == OFFSET_REF
2996 && TREE_CODE (TREE_TYPE (val
)) == METHOD_TYPE
)
2998 /* This is unclean. Should be handled elsewhere. */
2999 val
= build_unary_op (ADDR_EXPR
, val
, 0);
3001 else if (TREE_CODE (val
) == OFFSET_REF
)
3002 val
= resolve_offset_ref (val
);
3004 /* build_c_cast puts on a NOP_EXPR to make the result not an lvalue.
3005 Strip such NOP_EXPRs, since VAL is used in non-lvalue context. */
3006 if (TREE_CODE (val
) == NOP_EXPR
3007 && TREE_TYPE (val
) == TREE_TYPE (TREE_OPERAND (val
, 0))
3008 && (type
== 0 || TREE_CODE (type
) != REFERENCE_TYPE
))
3009 val
= TREE_OPERAND (val
, 0);
3011 if (type
== 0 || TREE_CODE (type
) != REFERENCE_TYPE
)
3013 if (TREE_CODE (TREE_TYPE (val
)) == ARRAY_TYPE
3014 || TREE_CODE (TREE_TYPE (val
)) == FUNCTION_TYPE
3015 || TREE_CODE (TREE_TYPE (val
)) == METHOD_TYPE
)
3016 val
= default_conversion (val
);
3018 val
= require_complete_type (val
);
3021 if (val
== error_mark_node
)
3022 return error_mark_node
;
3026 /* Formal parm type is specified by a function prototype. */
3029 if (TYPE_SIZE (complete_type (type
)) == 0)
3031 error ("parameter type of called function is incomplete");
3036 parmval
= convert_for_initialization
3037 (return_loc
, type
, val
, flags
,
3038 "argument passing", fndecl
, i
);
3039 #ifdef PROMOTE_PROTOTYPES
3040 if ((TREE_CODE (type
) == INTEGER_TYPE
3041 || TREE_CODE (type
) == ENUMERAL_TYPE
)
3042 && (TYPE_PRECISION (type
)
3043 < TYPE_PRECISION (integer_type_node
)))
3044 parmval
= default_conversion (parmval
);
3048 if (parmval
== error_mark_node
)
3049 return error_mark_node
;
3051 result
= expr_tree_cons (NULL_TREE
, parmval
, result
);
3055 if (TREE_CODE (TREE_TYPE (val
)) == REFERENCE_TYPE
)
3056 val
= convert_from_reference (val
);
3058 result
= expr_tree_cons (NULL_TREE
,
3059 convert_arg_to_ellipsis (val
),
3064 typetail
= TREE_CHAIN (typetail
);
3067 if (typetail
!= 0 && typetail
!= void_list_node
)
3069 /* See if there are default arguments that can be used */
3070 if (TREE_PURPOSE (typetail
))
3072 for (; typetail
!= void_list_node
; ++i
)
3074 tree type
= TREE_VALUE (typetail
);
3075 tree val
= TREE_PURPOSE (typetail
);
3076 tree parmval
= convert_default_arg (type
, val
);
3078 if (parmval
== error_mark_node
)
3079 return error_mark_node
;
3081 result
= expr_tree_cons (0, parmval
, result
);
3082 typetail
= TREE_CHAIN (typetail
);
3083 /* ends with `...'. */
3084 if (typetail
== NULL_TREE
)
3092 char *buf
= (char *)alloca (32 + strlen (called_thing
));
3093 sprintf (buf
, "too few arguments to %s `%%#D'", called_thing
);
3094 cp_error_at (buf
, fndecl
);
3095 error ("at this point in file");
3098 error ("too few arguments to function");
3099 return error_mark_list
;
3103 return nreverse (result
);
3106 /* Build a binary-operation expression, after performing default
3107 conversions on the operands. CODE is the kind of expression to build. */
3110 build_x_binary_op (code
, arg1
, arg2
)
3111 enum tree_code code
;
3114 if (processing_template_decl
)
3115 return build_min_nt (code
, arg1
, arg2
);
3117 return build_new_op (code
, LOOKUP_NORMAL
, arg1
, arg2
, NULL_TREE
);
3121 build_binary_op (code
, arg1
, arg2
, convert_p
)
3122 enum tree_code code
;
3134 args
[0] = decay_conversion (args
[0]);
3135 args
[1] = decay_conversion (args
[1]);
3137 if (args
[0] == error_mark_node
|| args
[1] == error_mark_node
)
3138 return error_mark_node
;
3140 type0
= TREE_TYPE (args
[0]);
3141 type1
= TREE_TYPE (args
[1]);
3143 if (type_unknown_p (args
[0]))
3145 args
[0] = instantiate_type (type1
, args
[0], 1);
3146 args
[0] = decay_conversion (args
[0]);
3148 else if (type_unknown_p (args
[1]))
3150 args
[1] = require_instantiated_type (type0
, args
[1],
3152 args
[1] = decay_conversion (args
[1]);
3155 if (IS_AGGR_TYPE (type0
) || IS_AGGR_TYPE (type1
))
3156 my_friendly_abort (754867);
3158 return build_binary_op_nodefault (code
, args
[0], args
[1], code
);
3161 /* Build a binary-operation expression without default conversions.
3162 CODE is the kind of expression to build.
3163 This function differs from `build' in several ways:
3164 the data type of the result is computed and recorded in it,
3165 warnings are generated if arg data types are invalid,
3166 special handling for addition and subtraction of pointers is known,
3167 and some optimization is done (operations on narrow ints
3168 are done in the narrower type when that gives the same result).
3169 Constant folding is also done before the result is returned.
3171 ERROR_CODE is the code that determines what to say in error messages.
3172 It is usually, but not always, the same as CODE.
3174 Note that the operands will never have enumeral types
3175 because either they have just had the default conversions performed
3176 or they have both just been converted to some other type in which
3177 the arithmetic is to be done.
3179 C++: must do special pointer arithmetic when implementing
3180 multiple inheritance, and deal with pointer to member functions. */
3183 build_binary_op_nodefault (code
, orig_op0
, orig_op1
, error_code
)
3184 enum tree_code code
;
3185 tree orig_op0
, orig_op1
;
3186 enum tree_code error_code
;
3189 register enum tree_code code0
, code1
;
3192 /* Expression code to give to the expression when it is built.
3193 Normally this is CODE, which is what the caller asked for,
3194 but in some special cases we change it. */
3195 register enum tree_code resultcode
= code
;
3197 /* Data type in which the computation is to be performed.
3198 In the simplest cases this is the common type of the arguments. */
3199 register tree result_type
= NULL
;
3201 /* Nonzero means operands have already been type-converted
3202 in whatever way is necessary.
3203 Zero means they need to be converted to RESULT_TYPE. */
3206 /* Nonzero means create the expression with this type, rather than
3208 tree build_type
= 0;
3210 /* Nonzero means after finally constructing the expression
3211 convert it to this type. */
3212 tree final_type
= 0;
3214 /* Nonzero if this is an operation like MIN or MAX which can
3215 safely be computed in short if both args are promoted shorts.
3216 Also implies COMMON.
3217 -1 indicates a bitwise operation; this makes a difference
3218 in the exact conditions for when it is safe to do the operation
3219 in a narrower mode. */
3222 /* Nonzero if this is a comparison operation;
3223 if both args are promoted shorts, compare the original shorts.
3224 Also implies COMMON. */
3225 int short_compare
= 0;
3227 /* Nonzero if this is a right-shift operation, which can be computed on the
3228 original short and then promoted if the operand is a promoted short. */
3229 int short_shift
= 0;
3231 /* Nonzero means set RESULT_TYPE to the common type of the args. */
3234 /* Apply default conversions. */
3235 if (code
== TRUTH_AND_EXPR
|| code
== TRUTH_ANDIF_EXPR
3236 || code
== TRUTH_OR_EXPR
|| code
== TRUTH_ORIF_EXPR
3237 || code
== TRUTH_XOR_EXPR
)
3239 op0
= decay_conversion (orig_op0
);
3240 op1
= decay_conversion (orig_op1
);
3244 op0
= default_conversion (orig_op0
);
3245 op1
= default_conversion (orig_op1
);
3248 type0
= TREE_TYPE (op0
);
3249 type1
= TREE_TYPE (op1
);
3251 /* The expression codes of the data types of the arguments tell us
3252 whether the arguments are integers, floating, pointers, etc. */
3253 code0
= TREE_CODE (type0
);
3254 code1
= TREE_CODE (type1
);
3256 /* Strip NON_LVALUE_EXPRs, etc., since we aren't using as an lvalue. */
3257 STRIP_TYPE_NOPS (op0
);
3258 STRIP_TYPE_NOPS (op1
);
3260 /* If an error was already reported for one of the arguments,
3261 avoid reporting another error. */
3263 if (code0
== ERROR_MARK
|| code1
== ERROR_MARK
)
3264 return error_mark_node
;
3269 /* Handle the pointer + int case. */
3270 if (code0
== POINTER_TYPE
&& code1
== INTEGER_TYPE
)
3271 return pointer_int_sum (PLUS_EXPR
, op0
, op1
);
3272 else if (code1
== POINTER_TYPE
&& code0
== INTEGER_TYPE
)
3273 return pointer_int_sum (PLUS_EXPR
, op1
, op0
);
3279 /* Subtraction of two similar pointers.
3280 We must subtract them as integers, then divide by object size. */
3281 if (code0
== POINTER_TYPE
&& code1
== POINTER_TYPE
3282 && comp_target_types (type0
, type1
, 1))
3283 return pointer_diff (op0
, op1
, common_type (type0
, type1
));
3284 /* Handle pointer minus int. Just like pointer plus int. */
3285 else if (code0
== POINTER_TYPE
&& code1
== INTEGER_TYPE
)
3286 return pointer_int_sum (MINUS_EXPR
, op0
, op1
);
3295 case TRUNC_DIV_EXPR
:
3297 case FLOOR_DIV_EXPR
:
3298 case ROUND_DIV_EXPR
:
3299 case EXACT_DIV_EXPR
:
3300 if ((code0
== INTEGER_TYPE
|| code0
== REAL_TYPE
3301 || code0
== COMPLEX_TYPE
)
3302 && (code1
== INTEGER_TYPE
|| code1
== REAL_TYPE
3303 || code1
== COMPLEX_TYPE
))
3305 if (TREE_CODE (op1
) == INTEGER_CST
&& integer_zerop (op1
))
3306 cp_warning ("division by zero in `%E / 0'", op0
);
3307 else if (TREE_CODE (op1
) == REAL_CST
&& real_zerop (op1
))
3308 cp_warning ("division by zero in `%E / 0.'", op0
);
3310 if (!(code0
== INTEGER_TYPE
&& code1
== INTEGER_TYPE
))
3311 resultcode
= RDIV_EXPR
;
3313 /* When dividing two signed integers, we have to promote to int.
3314 unless we divide by a constant != -1. Note that default
3315 conversion will have been performed on the operands at this
3316 point, so we have to dig out the original type to find out if
3318 shorten
= ((TREE_CODE (op0
) == NOP_EXPR
3319 && TREE_UNSIGNED (TREE_TYPE (TREE_OPERAND (op0
, 0))))
3320 || (TREE_CODE (op1
) == INTEGER_CST
3321 && (TREE_INT_CST_LOW (op1
) != -1
3322 || TREE_INT_CST_HIGH (op1
) != -1)));
3328 case BIT_ANDTC_EXPR
:
3331 if (code0
== INTEGER_TYPE
&& code1
== INTEGER_TYPE
)
3333 /* If one operand is a constant, and the other is a short type
3334 that has been converted to an int,
3335 really do the work in the short type and then convert the
3336 result to int. If we are lucky, the constant will be 0 or 1
3337 in the short type, making the entire operation go away. */
3338 if (TREE_CODE (op0
) == INTEGER_CST
3339 && TREE_CODE (op1
) == NOP_EXPR
3340 && (TYPE_PRECISION (type1
)
3341 > TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (op1
, 0))))
3342 && TREE_UNSIGNED (TREE_TYPE (TREE_OPERAND (op1
, 0))))
3344 final_type
= result_type
;
3345 op1
= TREE_OPERAND (op1
, 0);
3346 result_type
= TREE_TYPE (op1
);
3348 if (TREE_CODE (op1
) == INTEGER_CST
3349 && TREE_CODE (op0
) == NOP_EXPR
3350 && (TYPE_PRECISION (type0
)
3351 > TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (op0
, 0))))
3352 && TREE_UNSIGNED (TREE_TYPE (TREE_OPERAND (op0
, 0))))
3354 final_type
= result_type
;
3355 op0
= TREE_OPERAND (op0
, 0);
3356 result_type
= TREE_TYPE (op0
);
3360 case TRUNC_MOD_EXPR
:
3361 case FLOOR_MOD_EXPR
:
3362 if (code1
== INTEGER_TYPE
&& integer_zerop (op1
))
3363 cp_warning ("division by zero in `%E % 0'", op0
);
3364 else if (code1
== REAL_TYPE
&& real_zerop (op1
))
3365 cp_warning ("division by zero in `%E % 0.'", op0
);
3367 if (code0
== INTEGER_TYPE
&& code1
== INTEGER_TYPE
)
3369 /* Although it would be tempting to shorten always here, that loses
3370 on some targets, since the modulo instruction is undefined if the
3371 quotient can't be represented in the computation mode. We shorten
3372 only if unsigned or if dividing by something we know != -1. */
3373 shorten
= ((TREE_CODE (op0
) == NOP_EXPR
3374 && TREE_UNSIGNED (TREE_TYPE (TREE_OPERAND (op0
, 0))))
3375 || (TREE_CODE (op1
) == INTEGER_CST
3376 && (TREE_INT_CST_LOW (op1
) != -1
3377 || TREE_INT_CST_HIGH (op1
) != -1)));
3382 case TRUTH_ANDIF_EXPR
:
3383 case TRUTH_ORIF_EXPR
:
3384 case TRUTH_AND_EXPR
:
3386 result_type
= boolean_type_node
;
3389 /* Shift operations: result has same type as first operand;
3390 always convert second operand to int.
3391 Also set SHORT_SHIFT if shifting rightward. */
3394 if (code0
== INTEGER_TYPE
&& code1
== INTEGER_TYPE
)
3396 result_type
= type0
;
3397 if (TREE_CODE (op1
) == INTEGER_CST
)
3399 if (tree_int_cst_lt (op1
, integer_zero_node
))
3400 warning ("right shift count is negative");
3403 if (TREE_INT_CST_LOW (op1
) | TREE_INT_CST_HIGH (op1
))
3405 if (TREE_INT_CST_HIGH (op1
) != 0
3406 || ((unsigned HOST_WIDE_INT
) TREE_INT_CST_LOW (op1
)
3407 >= TYPE_PRECISION (type0
)))
3408 warning ("right shift count >= width of type");
3411 /* Convert the shift-count to an integer, regardless of
3412 size of value being shifted. */
3413 if (TYPE_MAIN_VARIANT (TREE_TYPE (op1
)) != integer_type_node
)
3414 op1
= cp_convert (integer_type_node
, op1
);
3415 /* Avoid converting op1 to result_type later. */
3421 if (code0
== INTEGER_TYPE
&& code1
== INTEGER_TYPE
)
3423 result_type
= type0
;
3424 if (TREE_CODE (op1
) == INTEGER_CST
)
3426 if (tree_int_cst_lt (op1
, integer_zero_node
))
3427 warning ("left shift count is negative");
3428 else if (TREE_INT_CST_HIGH (op1
) != 0
3429 || ((unsigned HOST_WIDE_INT
) TREE_INT_CST_LOW (op1
)
3430 >= TYPE_PRECISION (type0
)))
3431 warning ("left shift count >= width of type");
3433 /* Convert the shift-count to an integer, regardless of
3434 size of value being shifted. */
3435 if (TYPE_MAIN_VARIANT (TREE_TYPE (op1
)) != integer_type_node
)
3436 op1
= cp_convert (integer_type_node
, op1
);
3437 /* Avoid converting op1 to result_type later. */
3444 if (code0
== INTEGER_TYPE
&& code1
== INTEGER_TYPE
)
3446 result_type
= type0
;
3447 if (TREE_CODE (op1
) == INTEGER_CST
)
3449 if (tree_int_cst_lt (op1
, integer_zero_node
))
3450 warning ("%s rotate count is negative",
3451 (code
== LROTATE_EXPR
) ? "left" : "right");
3452 else if (TREE_INT_CST_HIGH (op1
) != 0
3453 || ((unsigned HOST_WIDE_INT
) TREE_INT_CST_LOW (op1
)
3454 >= TYPE_PRECISION (type0
)))
3455 warning ("%s rotate count >= width of type",
3456 (code
== LROTATE_EXPR
) ? "left" : "right");
3458 /* Convert the shift-count to an integer, regardless of
3459 size of value being shifted. */
3460 if (TYPE_MAIN_VARIANT (TREE_TYPE (op1
)) != integer_type_node
)
3461 op1
= cp_convert (integer_type_node
, op1
);
3467 build_type
= boolean_type_node
;
3468 if ((code0
== INTEGER_TYPE
|| code0
== REAL_TYPE
3469 || code0
== COMPLEX_TYPE
)
3470 && (code1
== INTEGER_TYPE
|| code1
== REAL_TYPE
3471 || code1
== COMPLEX_TYPE
))
3473 else if (code0
== POINTER_TYPE
&& code1
== POINTER_TYPE
)
3475 register tree tt0
= TYPE_MAIN_VARIANT (TREE_TYPE (type0
));
3476 register tree tt1
= TYPE_MAIN_VARIANT (TREE_TYPE (type1
));
3478 if (comp_target_types (type0
, type1
, 1))
3479 result_type
= common_type (type0
, type1
);
3480 else if (tt0
== void_type_node
)
3482 if (pedantic
&& TREE_CODE (tt1
) == FUNCTION_TYPE
3483 && tree_int_cst_lt (TYPE_SIZE (type0
), TYPE_SIZE (type1
)))
3484 pedwarn ("ANSI C++ forbids comparison of `void *' with function pointer");
3485 else if (TREE_CODE (tt1
) == OFFSET_TYPE
)
3486 pedwarn ("ANSI C++ forbids conversion of a pointer to member to `void *'");
3488 else if (tt1
== void_type_node
)
3490 if (pedantic
&& TREE_CODE (tt0
) == FUNCTION_TYPE
3491 && tree_int_cst_lt (TYPE_SIZE (type1
), TYPE_SIZE (type0
)))
3492 pedwarn ("ANSI C++ forbids comparison of `void *' with function pointer");
3495 cp_pedwarn ("comparison of distinct pointer types `%T' and `%T' lacks a cast",
3498 if (result_type
== NULL_TREE
)
3499 result_type
= ptr_type_node
;
3501 else if (code0
== POINTER_TYPE
&& TREE_CODE (op1
) == INTEGER_CST
3502 && integer_zerop (op1
))
3503 result_type
= type0
;
3504 else if (code1
== POINTER_TYPE
&& TREE_CODE (op0
) == INTEGER_CST
3505 && integer_zerop (op0
))
3506 result_type
= type1
;
3507 else if (code0
== POINTER_TYPE
&& code1
== INTEGER_TYPE
)
3509 result_type
= type0
;
3510 error ("ANSI C++ forbids comparison between pointer and integer");
3512 else if (code0
== INTEGER_TYPE
&& code1
== POINTER_TYPE
)
3514 result_type
= type1
;
3515 error ("ANSI C++ forbids comparison between pointer and integer");
3517 else if (TYPE_PTRMEMFUNC_P (type0
) && TREE_CODE (op1
) == INTEGER_CST
3518 && integer_zerop (op1
))
3520 op0
= build_component_ref (op0
, index_identifier
, NULL_TREE
, 0);
3521 op1
= integer_zero_node
;
3522 result_type
= TREE_TYPE (op0
);
3524 else if (TYPE_PTRMEMFUNC_P (type1
) && TREE_CODE (op0
) == INTEGER_CST
3525 && integer_zerop (op0
))
3527 op0
= build_component_ref (op1
, index_identifier
, NULL_TREE
, 0);
3528 op1
= integer_zero_node
;
3529 result_type
= TREE_TYPE (op0
);
3531 else if (TYPE_PTRMEMFUNC_P (type0
) && TYPE_PTRMEMFUNC_P (type1
)
3532 && (TYPE_PTRMEMFUNC_FN_TYPE (type0
)
3533 == TYPE_PTRMEMFUNC_FN_TYPE (type1
)))
3535 /* The code we generate for the test is:
3537 (op0.index == op1.index
3538 && ((op1.index != -1 && op0.delta2 == op1.delta2)
3539 || op0.pfn == op1.pfn)) */
3541 tree index0
= build_component_ref (op0
, index_identifier
,
3543 tree index1
= save_expr (build_component_ref (op1
, index_identifier
,
3545 tree pfn0
= PFN_FROM_PTRMEMFUNC (op0
);
3546 tree pfn1
= PFN_FROM_PTRMEMFUNC (op1
);
3547 tree delta20
= DELTA2_FROM_PTRMEMFUNC (op0
);
3548 tree delta21
= DELTA2_FROM_PTRMEMFUNC (op1
);
3550 tree integer_neg_one_node
3551 = build_binary_op (MINUS_EXPR
, integer_zero_node
,
3552 integer_one_node
, 1);
3553 e1
= build_binary_op (EQ_EXPR
, index0
, index1
, 1);
3554 e2
= build_binary_op (NE_EXPR
, index1
, integer_neg_one_node
, 1);
3555 e2
= build_binary_op (TRUTH_ANDIF_EXPR
, e2
,
3556 build_binary_op (EQ_EXPR
, delta20
, delta21
, 1),
3558 e3
= build_binary_op (EQ_EXPR
, pfn0
, pfn1
, 1);
3559 e2
= build_binary_op (TRUTH_ORIF_EXPR
, e2
, e3
, 1);
3560 e2
= build_binary_op (TRUTH_ANDIF_EXPR
, e1
, e2
, 1);
3561 if (code
== EQ_EXPR
)
3563 return build_binary_op (EQ_EXPR
, e2
, integer_zero_node
, 1);
3565 else if (TYPE_PTRMEMFUNC_P (type0
)
3566 && TYPE_PTRMEMFUNC_FN_TYPE (type0
) == type1
)
3568 tree index0
= build_component_ref (op0
, index_identifier
,
3571 tree pfn0
= PFN_FROM_PTRMEMFUNC (op0
);
3572 tree delta20
= DELTA2_FROM_PTRMEMFUNC (op0
);
3573 tree delta21
= integer_zero_node
;
3575 tree integer_neg_one_node
3576 = build_binary_op (MINUS_EXPR
, integer_zero_node
, integer_one_node
, 1);
3577 if (TREE_CODE (TREE_OPERAND (op1
, 0)) == FUNCTION_DECL
3578 && DECL_VINDEX (TREE_OPERAND (op1
, 0)))
3580 /* Map everything down one to make room for
3581 the null pointer to member. */
3582 index1
= size_binop (PLUS_EXPR
,
3583 DECL_VINDEX (TREE_OPERAND (op1
, 0)),
3585 op1
= integer_zero_node
;
3586 delta21
= CLASSTYPE_VFIELD (TYPE_METHOD_BASETYPE
3587 (TREE_TYPE (type1
)));
3588 delta21
= DECL_FIELD_BITPOS (delta21
);
3589 delta21
= size_binop (FLOOR_DIV_EXPR
, delta21
,
3590 size_int (BITS_PER_UNIT
));
3591 delta21
= convert (sizetype
, delta21
);
3594 index1
= integer_neg_one_node
;
3596 tree nop1
= build1 (NOP_EXPR
, TYPE_PTRMEMFUNC_FN_TYPE (type0
),
3598 TREE_CONSTANT (nop1
) = TREE_CONSTANT (op1
);
3601 e1
= build_binary_op (EQ_EXPR
, index0
, index1
, 1);
3602 e2
= build_binary_op (NE_EXPR
, index1
, integer_neg_one_node
, 1);
3603 e2
= build_binary_op (TRUTH_ANDIF_EXPR
, e2
,
3604 build_binary_op (EQ_EXPR
, delta20
, delta21
, 1),
3606 e3
= build_binary_op (EQ_EXPR
, pfn0
, op1
, 1);
3607 e2
= build_binary_op (TRUTH_ORIF_EXPR
, e2
, e3
, 1);
3608 e2
= build_binary_op (TRUTH_ANDIF_EXPR
, e1
, e2
, 1);
3609 if (code
== EQ_EXPR
)
3611 return build_binary_op (EQ_EXPR
, e2
, integer_zero_node
, 1);
3613 else if (TYPE_PTRMEMFUNC_P (type1
)
3614 && TYPE_PTRMEMFUNC_FN_TYPE (type1
) == type0
)
3616 return build_binary_op (code
, op1
, op0
, 1);
3622 if ((code0
== INTEGER_TYPE
|| code0
== REAL_TYPE
)
3623 && (code1
== INTEGER_TYPE
|| code1
== REAL_TYPE
))
3625 else if (code0
== POINTER_TYPE
&& code1
== POINTER_TYPE
)
3627 if (comp_target_types (type0
, type1
, 1))
3628 result_type
= common_type (type0
, type1
);
3631 cp_pedwarn ("comparison of distinct pointer types `%T' and `%T' lacks a cast",
3633 result_type
= ptr_type_node
;
3642 build_type
= boolean_type_node
;
3643 if ((code0
== INTEGER_TYPE
|| code0
== REAL_TYPE
)
3644 && (code1
== INTEGER_TYPE
|| code1
== REAL_TYPE
))
3646 else if (code0
== POINTER_TYPE
&& code1
== POINTER_TYPE
)
3648 if (comp_target_types (type0
, type1
, 1))
3649 result_type
= common_type (type0
, type1
);
3652 cp_pedwarn ("comparison of distinct pointer types `%T' and `%T' lacks a cast",
3654 result_type
= ptr_type_node
;
3657 else if (code0
== POINTER_TYPE
&& TREE_CODE (op1
) == INTEGER_CST
3658 && integer_zerop (op1
))
3659 result_type
= type0
;
3660 else if (code1
== POINTER_TYPE
&& TREE_CODE (op0
) == INTEGER_CST
3661 && integer_zerop (op0
))
3662 result_type
= type1
;
3663 else if (code0
== POINTER_TYPE
&& code1
== INTEGER_TYPE
)
3665 result_type
= type0
;
3666 pedwarn ("ANSI C++ forbids comparison between pointer and integer");
3668 else if (code0
== INTEGER_TYPE
&& code1
== POINTER_TYPE
)
3670 result_type
= type1
;
3671 pedwarn ("ANSI C++ forbids comparison between pointer and integer");
3679 if ((code0
== INTEGER_TYPE
|| code0
== REAL_TYPE
|| code0
== COMPLEX_TYPE
)
3681 (code1
== INTEGER_TYPE
|| code1
== REAL_TYPE
|| code1
== COMPLEX_TYPE
))
3683 int none_complex
= (code0
!= COMPLEX_TYPE
&& code1
!= COMPLEX_TYPE
);
3685 if (shorten
|| common
|| short_compare
)
3686 result_type
= common_type (type0
, type1
);
3688 /* For certain operations (which identify themselves by shorten != 0)
3689 if both args were extended from the same smaller type,
3690 do the arithmetic in that type and then extend.
3692 shorten !=0 and !=1 indicates a bitwise operation.
3693 For them, this optimization is safe only if
3694 both args are zero-extended or both are sign-extended.
3695 Otherwise, we might change the result.
3696 Eg, (short)-1 | (unsigned short)-1 is (int)-1
3697 but calculated in (unsigned short) it would be (unsigned short)-1. */
3699 if (shorten
&& none_complex
)
3701 int unsigned0
, unsigned1
;
3702 tree arg0
= get_narrower (op0
, &unsigned0
);
3703 tree arg1
= get_narrower (op1
, &unsigned1
);
3704 /* UNS is 1 if the operation to be done is an unsigned one. */
3705 int uns
= TREE_UNSIGNED (result_type
);
3708 final_type
= result_type
;
3710 /* Handle the case that OP0 does not *contain* a conversion
3711 but it *requires* conversion to FINAL_TYPE. */
3713 if (op0
== arg0
&& TREE_TYPE (op0
) != final_type
)
3714 unsigned0
= TREE_UNSIGNED (TREE_TYPE (op0
));
3715 if (op1
== arg1
&& TREE_TYPE (op1
) != final_type
)
3716 unsigned1
= TREE_UNSIGNED (TREE_TYPE (op1
));
3718 /* Now UNSIGNED0 is 1 if ARG0 zero-extends to FINAL_TYPE. */
3720 /* For bitwise operations, signedness of nominal type
3721 does not matter. Consider only how operands were extended. */
3725 /* Note that in all three cases below we refrain from optimizing
3726 an unsigned operation on sign-extended args.
3727 That would not be valid. */
3729 /* Both args variable: if both extended in same way
3730 from same width, do it in that width.
3731 Do it unsigned if args were zero-extended. */
3732 if ((TYPE_PRECISION (TREE_TYPE (arg0
))
3733 < TYPE_PRECISION (result_type
))
3734 && (TYPE_PRECISION (TREE_TYPE (arg1
))
3735 == TYPE_PRECISION (TREE_TYPE (arg0
)))
3736 && unsigned0
== unsigned1
3737 && (unsigned0
|| !uns
))
3739 = signed_or_unsigned_type (unsigned0
,
3740 common_type (TREE_TYPE (arg0
),
3742 else if (TREE_CODE (arg0
) == INTEGER_CST
3743 && (unsigned1
|| !uns
)
3744 && (TYPE_PRECISION (TREE_TYPE (arg1
))
3745 < TYPE_PRECISION (result_type
))
3746 && (type
= signed_or_unsigned_type (unsigned1
,
3748 int_fits_type_p (arg0
, type
)))
3750 else if (TREE_CODE (arg1
) == INTEGER_CST
3751 && (unsigned0
|| !uns
)
3752 && (TYPE_PRECISION (TREE_TYPE (arg0
))
3753 < TYPE_PRECISION (result_type
))
3754 && (type
= signed_or_unsigned_type (unsigned0
,
3756 int_fits_type_p (arg1
, type
)))
3760 /* Shifts can be shortened if shifting right. */
3765 tree arg0
= get_narrower (op0
, &unsigned_arg
);
3767 final_type
= result_type
;
3769 if (arg0
== op0
&& final_type
== TREE_TYPE (op0
))
3770 unsigned_arg
= TREE_UNSIGNED (TREE_TYPE (op0
));
3772 if (TYPE_PRECISION (TREE_TYPE (arg0
)) < TYPE_PRECISION (result_type
)
3773 /* We can shorten only if the shift count is less than the
3774 number of bits in the smaller type size. */
3775 && TREE_INT_CST_HIGH (op1
) == 0
3776 && TYPE_PRECISION (TREE_TYPE (arg0
)) > TREE_INT_CST_LOW (op1
)
3777 /* If arg is sign-extended and then unsigned-shifted,
3778 we can simulate this with a signed shift in arg's type
3779 only if the extended result is at least twice as wide
3780 as the arg. Otherwise, the shift could use up all the
3781 ones made by sign-extension and bring in zeros.
3782 We can't optimize that case at all, but in most machines
3783 it never happens because available widths are 2**N. */
3784 && (!TREE_UNSIGNED (final_type
)
3786 || (((unsigned) 2 * TYPE_PRECISION (TREE_TYPE (arg0
)))
3787 <= TYPE_PRECISION (result_type
))))
3789 /* Do an unsigned shift if the operand was zero-extended. */
3791 = signed_or_unsigned_type (unsigned_arg
,
3793 /* Convert value-to-be-shifted to that type. */
3794 if (TREE_TYPE (op0
) != result_type
)
3795 op0
= cp_convert (result_type
, op0
);
3800 /* Comparison operations are shortened too but differently.
3801 They identify themselves by setting short_compare = 1. */
3805 /* Don't write &op0, etc., because that would prevent op0
3806 from being kept in a register.
3807 Instead, make copies of the our local variables and
3808 pass the copies by reference, then copy them back afterward. */
3809 tree xop0
= op0
, xop1
= op1
, xresult_type
= result_type
;
3810 enum tree_code xresultcode
= resultcode
;
3812 = shorten_compare (&xop0
, &xop1
, &xresult_type
, &xresultcode
);
3814 return cp_convert (boolean_type_node
, val
);
3815 op0
= xop0
, op1
= xop1
;
3817 resultcode
= xresultcode
;
3820 if (short_compare
&& warn_sign_compare
)
3822 int op0_signed
= ! TREE_UNSIGNED (TREE_TYPE (orig_op0
));
3823 int op1_signed
= ! TREE_UNSIGNED (TREE_TYPE (orig_op1
));
3825 int unsignedp0
, unsignedp1
;
3826 tree primop0
= get_narrower (op0
, &unsignedp0
);
3827 tree primop1
= get_narrower (op1
, &unsignedp1
);
3829 /* Check for comparison of different enum types. */
3830 if (flag_int_enum_equivalence
== 0
3831 && TREE_CODE (TREE_TYPE (orig_op0
)) == ENUMERAL_TYPE
3832 && TREE_CODE (TREE_TYPE (orig_op1
)) == ENUMERAL_TYPE
3833 && TYPE_MAIN_VARIANT (TREE_TYPE (orig_op0
))
3834 != TYPE_MAIN_VARIANT (TREE_TYPE (orig_op1
)))
3836 cp_warning ("comparison between `%#T' and `%#T'",
3837 TREE_TYPE (orig_op0
), TREE_TYPE (orig_op1
));
3840 /* Give warnings for comparisons between signed and unsigned
3841 quantities that may fail. */
3842 /* Do the checking based on the original operand trees, so that
3843 casts will be considered, but default promotions won't be. */
3845 /* Do not warn if the comparison is being done in a signed type,
3846 since the signed type will only be chosen if it can represent
3847 all the values of the unsigned type. */
3848 if (! TREE_UNSIGNED (result_type
))
3850 /* Do not warn if both operands are unsigned. */
3851 else if (op0_signed
== op1_signed
)
3853 /* Do not warn if the signed quantity is an unsuffixed
3854 integer literal (or some static constant expression
3855 involving such literals) and it is non-negative. */
3856 else if ((op0_signed
&& TREE_CODE (orig_op0
) == INTEGER_CST
3857 && tree_int_cst_sgn (orig_op0
) >= 0)
3858 || (op1_signed
&& TREE_CODE (orig_op1
) == INTEGER_CST
3859 && tree_int_cst_sgn (orig_op1
) >= 0))
3861 /* Do not warn if the comparison is an equality operation,
3862 the unsigned quantity is an integral constant and it does
3863 not use the most significant bit of result_type. */
3864 else if ((resultcode
== EQ_EXPR
|| resultcode
== NE_EXPR
)
3865 && ((op0_signed
&& TREE_CODE (orig_op1
) == INTEGER_CST
3866 && int_fits_type_p (orig_op1
,
3867 signed_type (result_type
)))
3868 || (op1_signed
&& TREE_CODE (orig_op0
) == INTEGER_CST
3869 && int_fits_type_p (orig_op0
,
3870 signed_type (result_type
)))))
3873 warning ("comparison between signed and unsigned");
3875 /* Warn if two unsigned values are being compared in a size
3876 larger than their original size, and one (and only one) is the
3877 result of a `~' operator. This comparison will always fail.
3879 Also warn if one operand is a constant, and the constant does not
3880 have all bits set that are set in the ~ operand when it is
3883 if ((TREE_CODE (primop0
) == BIT_NOT_EXPR
)
3884 ^ (TREE_CODE (primop1
) == BIT_NOT_EXPR
))
3886 if (TREE_CODE (primop0
) == BIT_NOT_EXPR
)
3887 primop0
= get_narrower (TREE_OPERAND (op0
, 0), &unsignedp0
);
3888 if (TREE_CODE (primop1
) == BIT_NOT_EXPR
)
3889 primop1
= get_narrower (TREE_OPERAND (op1
, 0), &unsignedp1
);
3891 if (TREE_CODE (primop0
) == INTEGER_CST
3892 || TREE_CODE (primop1
) == INTEGER_CST
)
3895 HOST_WIDE_INT constant
, mask
;
3899 if (TREE_CODE (primop0
) == INTEGER_CST
)
3902 unsignedp
= unsignedp1
;
3903 constant
= TREE_INT_CST_LOW (primop0
);
3908 unsignedp
= unsignedp0
;
3909 constant
= TREE_INT_CST_LOW (primop1
);
3912 bits
= TYPE_PRECISION (TREE_TYPE (primop
));
3913 if (bits
< TYPE_PRECISION (result_type
)
3914 && bits
< HOST_BITS_PER_LONG
&& unsignedp
)
3916 mask
= (~ (HOST_WIDE_INT
) 0) << bits
;
3917 if ((mask
& constant
) != mask
)
3918 warning ("comparison of promoted ~unsigned with constant");
3921 else if (unsignedp0
&& unsignedp1
3922 && (TYPE_PRECISION (TREE_TYPE (primop0
))
3923 < TYPE_PRECISION (result_type
))
3924 && (TYPE_PRECISION (TREE_TYPE (primop1
))
3925 < TYPE_PRECISION (result_type
)))
3926 warning ("comparison of promoted ~unsigned with unsigned");
3931 /* At this point, RESULT_TYPE must be nonzero to avoid an error message.
3932 If CONVERTED is zero, both args will be converted to type RESULT_TYPE.
3933 Then the expression will be built.
3934 It will be given type FINAL_TYPE if that is nonzero;
3935 otherwise, it will be given type RESULT_TYPE. */
3939 cp_error ("invalid operands `%T' and `%T' to binary `%O'",
3940 TREE_TYPE (orig_op0
), TREE_TYPE (orig_op1
), error_code
);
3941 return error_mark_node
;
3946 if (TREE_TYPE (op0
) != result_type
)
3947 op0
= cp_convert (result_type
, op0
);
3948 if (TREE_TYPE (op1
) != result_type
)
3949 op1
= cp_convert (result_type
, op1
);
3952 if (build_type
== NULL_TREE
)
3953 build_type
= result_type
;
3956 register tree result
= build (resultcode
, build_type
, op0
, op1
);
3957 register tree folded
;
3959 folded
= fold (result
);
3960 if (folded
== result
)
3961 TREE_CONSTANT (folded
) = TREE_CONSTANT (op0
) & TREE_CONSTANT (op1
);
3962 if (final_type
!= 0)
3963 return cp_convert (final_type
, folded
);
3968 /* Return a tree for the sum or difference (RESULTCODE says which)
3969 of pointer PTROP and integer INTOP. */
3972 pointer_int_sum (resultcode
, ptrop
, intop
)
3973 enum tree_code resultcode
;
3974 register tree ptrop
, intop
;
3978 register tree result
;
3979 register tree folded
= fold (intop
);
3981 /* The result is a pointer of the same type that is being added. */
3983 register tree result_type
= TREE_TYPE (ptrop
);
3985 if (!complete_type_or_else (result_type
))
3986 return error_mark_node
;
3988 if (TREE_CODE (TREE_TYPE (result_type
)) == VOID_TYPE
)
3990 if (pedantic
|| warn_pointer_arith
)
3991 pedwarn ("ANSI C++ forbids using pointer of type `void *' in arithmetic");
3992 size_exp
= integer_one_node
;
3994 else if (TREE_CODE (TREE_TYPE (result_type
)) == FUNCTION_TYPE
)
3996 if (pedantic
|| warn_pointer_arith
)
3997 pedwarn ("ANSI C++ forbids using pointer to a function in arithmetic");
3998 size_exp
= integer_one_node
;
4000 else if (TREE_CODE (TREE_TYPE (result_type
)) == METHOD_TYPE
)
4002 if (pedantic
|| warn_pointer_arith
)
4003 pedwarn ("ANSI C++ forbids using pointer to a method in arithmetic");
4004 size_exp
= integer_one_node
;
4006 else if (TREE_CODE (TREE_TYPE (result_type
)) == OFFSET_TYPE
)
4008 if (pedantic
|| warn_pointer_arith
)
4009 pedwarn ("ANSI C++ forbids using pointer to a member in arithmetic");
4010 size_exp
= integer_one_node
;
4013 size_exp
= size_in_bytes (complete_type (TREE_TYPE (result_type
)));
4015 /* Needed to make OOPS V2R3 work. */
4017 if (TREE_CODE (intop
) == INTEGER_CST
4018 && TREE_INT_CST_LOW (intop
) == 0
4019 && TREE_INT_CST_HIGH (intop
) == 0)
4022 /* If what we are about to multiply by the size of the elements
4023 contains a constant term, apply distributive law
4024 and multiply that constant term separately.
4025 This helps produce common subexpressions. */
4027 if ((TREE_CODE (intop
) == PLUS_EXPR
|| TREE_CODE (intop
) == MINUS_EXPR
)
4028 && ! TREE_CONSTANT (intop
)
4029 && TREE_CONSTANT (TREE_OPERAND (intop
, 1))
4030 && TREE_CONSTANT (size_exp
))
4032 enum tree_code subcode
= resultcode
;
4033 if (TREE_CODE (intop
) == MINUS_EXPR
)
4034 subcode
= (subcode
== PLUS_EXPR
? MINUS_EXPR
: PLUS_EXPR
);
4035 ptrop
= build_binary_op (subcode
, ptrop
, TREE_OPERAND (intop
, 1), 1);
4036 intop
= TREE_OPERAND (intop
, 0);
4039 /* Convert the integer argument to a type the same size as sizetype
4040 so the multiply won't overflow spuriously. */
4042 if (TYPE_PRECISION (TREE_TYPE (intop
)) != TYPE_PRECISION (sizetype
))
4043 intop
= cp_convert (type_for_size (TYPE_PRECISION (sizetype
), 0), intop
);
4045 /* Replace the integer argument with a suitable product by the object size.
4046 Do this multiplication as signed, then convert to the appropriate
4047 pointer type (actually unsigned integral). */
4049 intop
= cp_convert (result_type
,
4050 build_binary_op (MULT_EXPR
, intop
,
4051 cp_convert (TREE_TYPE (intop
),
4055 /* Create the sum or difference. */
4057 result
= build (resultcode
, result_type
, ptrop
, intop
);
4059 folded
= fold (result
);
4060 if (folded
== result
)
4061 TREE_CONSTANT (folded
) = TREE_CONSTANT (ptrop
) & TREE_CONSTANT (intop
);
4065 /* Return a tree for the difference of pointers OP0 and OP1.
4066 The resulting tree has type int. */
4069 pointer_diff (op0
, op1
, ptrtype
)
4070 register tree op0
, op1
;
4071 register tree ptrtype
;
4073 register tree result
, folded
;
4074 tree restype
= ptrdiff_type_node
;
4075 tree target_type
= TREE_TYPE (ptrtype
);
4077 if (!complete_type_or_else (target_type
))
4078 return error_mark_node
;
4080 if (pedantic
|| warn_pointer_arith
)
4082 if (TREE_CODE (target_type
) == VOID_TYPE
)
4083 pedwarn ("ANSI C++ forbids using pointer of type `void *' in subtraction");
4084 if (TREE_CODE (target_type
) == FUNCTION_TYPE
)
4085 pedwarn ("ANSI C++ forbids using pointer to a function in subtraction");
4086 if (TREE_CODE (target_type
) == METHOD_TYPE
)
4087 pedwarn ("ANSI C++ forbids using pointer to a method in subtraction");
4088 if (TREE_CODE (target_type
) == OFFSET_TYPE
)
4089 pedwarn ("ANSI C++ forbids using pointer to a member in subtraction");
4092 /* First do the subtraction as integers;
4093 then drop through to build the divide operator. */
4095 op0
= build_binary_op (MINUS_EXPR
, cp_convert (restype
, op0
),
4096 cp_convert (restype
, op1
), 1);
4098 /* This generates an error if op1 is a pointer to an incomplete type. */
4099 if (TYPE_SIZE (TREE_TYPE (TREE_TYPE (op1
))) == 0)
4100 error ("arithmetic on pointer to an incomplete type");
4102 op1
= ((TREE_CODE (target_type
) == VOID_TYPE
4103 || TREE_CODE (target_type
) == FUNCTION_TYPE
4104 || TREE_CODE (target_type
) == METHOD_TYPE
4105 || TREE_CODE (target_type
) == OFFSET_TYPE
)
4107 : size_in_bytes (target_type
));
4109 /* Do the division. */
4111 result
= build (EXACT_DIV_EXPR
, restype
, op0
, cp_convert (restype
, op1
));
4113 folded
= fold (result
);
4114 if (folded
== result
)
4115 TREE_CONSTANT (folded
) = TREE_CONSTANT (op0
) & TREE_CONSTANT (op1
);
4119 /* Handle the case of taking the address of a COMPONENT_REF.
4120 Called by `build_unary_op' and `build_up_reference'.
4122 ARG is the COMPONENT_REF whose address we want.
4123 ARGTYPE is the pointer type that this address should have.
4124 MSG is an error message to print if this COMPONENT_REF is not
4125 addressable (such as a bitfield). */
4128 build_component_addr (arg
, argtype
, msg
)
4132 tree field
= TREE_OPERAND (arg
, 1);
4133 tree basetype
= decl_type_context (field
);
4134 tree rval
= build_unary_op (ADDR_EXPR
, TREE_OPERAND (arg
, 0), 0);
4136 if (DECL_BIT_FIELD (field
))
4138 error (msg
, IDENTIFIER_POINTER (DECL_NAME (field
)));
4139 return error_mark_node
;
4142 if (TREE_CODE (field
) == FIELD_DECL
4143 && TYPE_USES_COMPLEX_INHERITANCE (basetype
))
4145 /* Can't convert directly to ARGTYPE, since that
4146 may have the same pointer type as one of our
4148 rval
= build1 (NOP_EXPR
, argtype
,
4149 convert_pointer_to (basetype
, rval
));
4150 TREE_CONSTANT (rval
) = TREE_CONSTANT (TREE_OPERAND (rval
, 0));
4153 /* This conversion is harmless. */
4154 rval
= convert_force (argtype
, rval
, 0);
4156 if (! integer_zerop (DECL_FIELD_BITPOS (field
)))
4158 tree offset
= size_binop (EASY_DIV_EXPR
, DECL_FIELD_BITPOS (field
),
4159 size_int (BITS_PER_UNIT
));
4160 int flag
= TREE_CONSTANT (rval
);
4161 offset
= convert (sizetype
, offset
);
4162 rval
= fold (build (PLUS_EXPR
, argtype
,
4163 rval
, cp_convert (argtype
, offset
)));
4164 TREE_CONSTANT (rval
) = flag
;
4169 /* Construct and perhaps optimize a tree representation
4170 for a unary operation. CODE, a tree_code, specifies the operation
4171 and XARG is the operand. */
4174 build_x_unary_op (code
, xarg
)
4175 enum tree_code code
;
4178 if (processing_template_decl
)
4179 return build_min_nt (code
, xarg
, NULL_TREE
);
4181 /* & rec, on incomplete RECORD_TYPEs is the simple opr &, not an
4183 if (code
== ADDR_EXPR
4184 && TREE_CODE (xarg
) != TEMPLATE_ID_EXPR
4185 && ((IS_AGGR_TYPE_CODE (TREE_CODE (TREE_TYPE (xarg
)))
4186 && TYPE_SIZE (TREE_TYPE (xarg
)) == NULL_TREE
)
4187 || (TREE_CODE (xarg
) == OFFSET_REF
)))
4188 /* don't look for a function */;
4193 rval
= build_new_op (code
, LOOKUP_NORMAL
, xarg
,
4194 NULL_TREE
, NULL_TREE
);
4195 if (rval
|| code
!= ADDR_EXPR
)
4199 if (code
== ADDR_EXPR
)
4201 if (TREE_CODE (xarg
) == TARGET_EXPR
)
4202 warning ("taking address of temporary");
4205 return build_unary_op (code
, xarg
, 0);
4208 /* Just like truthvalue_conversion, but we want a CLEANUP_POINT_EXPR. */
4211 condition_conversion (expr
)
4215 if (processing_template_decl
)
4217 t
= cp_convert (boolean_type_node
, expr
);
4218 t
= fold (build1 (CLEANUP_POINT_EXPR
, boolean_type_node
, t
));
4222 /* C++: Must handle pointers to members.
4224 Perhaps type instantiation should be extended to handle conversion
4225 from aggregates to types we don't yet know we want? (Or are those
4226 cases typically errors which should be reported?)
4228 NOCONVERT nonzero suppresses the default promotions
4229 (such as from short to int). */
4232 build_unary_op (code
, xarg
, noconvert
)
4233 enum tree_code code
;
4237 /* No default_conversion here. It causes trouble for ADDR_EXPR. */
4238 register tree arg
= xarg
;
4239 register tree argtype
= 0;
4240 char *errstring
= NULL
;
4243 if (arg
== error_mark_node
)
4244 return error_mark_node
;
4249 /* This is used for unary plus, because a CONVERT_EXPR
4250 is enough to prevent anybody from looking inside for
4251 associativity, but won't generate any code. */
4252 if (!(arg
= build_expr_type_conversion
4253 (WANT_ARITH
| WANT_ENUM
| WANT_POINTER
, arg
, 1)))
4254 errstring
= "wrong type argument to unary plus";
4258 arg
= default_conversion (arg
);
4259 arg
= build1 (NON_LVALUE_EXPR
, TREE_TYPE (arg
), arg
);
4260 TREE_CONSTANT (arg
) = TREE_CONSTANT (TREE_OPERAND (arg
, 0));
4265 if (!(arg
= build_expr_type_conversion (WANT_ARITH
| WANT_ENUM
, arg
, 1)))
4266 errstring
= "wrong type argument to unary minus";
4267 else if (!noconvert
)
4268 arg
= default_conversion (arg
);
4272 if (TREE_CODE (TREE_TYPE (arg
)) == COMPLEX_TYPE
)
4276 arg
= default_conversion (arg
);
4278 else if (!(arg
= build_expr_type_conversion (WANT_INT
| WANT_ENUM
,
4280 errstring
= "wrong type argument to bit-complement";
4281 else if (!noconvert
)
4282 arg
= default_conversion (arg
);
4286 if (!(arg
= build_expr_type_conversion (WANT_ARITH
| WANT_ENUM
, arg
, 1)))
4287 errstring
= "wrong type argument to abs";
4288 else if (!noconvert
)
4289 arg
= default_conversion (arg
);
4293 /* Conjugating a real value is a no-op, but allow it anyway. */
4294 if (!(arg
= build_expr_type_conversion (WANT_ARITH
| WANT_ENUM
, arg
, 1)))
4295 errstring
= "wrong type argument to conjugation";
4296 else if (!noconvert
)
4297 arg
= default_conversion (arg
);
4300 case TRUTH_NOT_EXPR
:
4301 arg
= cp_convert (boolean_type_node
, arg
);
4302 val
= invert_truthvalue (arg
);
4303 if (arg
!= error_mark_node
)
4305 errstring
= "in argument to unary !";
4312 if (TREE_CODE (arg
) == COMPLEX_CST
)
4313 return TREE_REALPART (arg
);
4314 else if (TREE_CODE (TREE_TYPE (arg
)) == COMPLEX_TYPE
)
4315 return fold (build1 (REALPART_EXPR
, TREE_TYPE (TREE_TYPE (arg
)), arg
));
4320 if (TREE_CODE (arg
) == COMPLEX_CST
)
4321 return TREE_IMAGPART (arg
);
4322 else if (TREE_CODE (TREE_TYPE (arg
)) == COMPLEX_TYPE
)
4323 return fold (build1 (IMAGPART_EXPR
, TREE_TYPE (TREE_TYPE (arg
)), arg
));
4325 return cp_convert (TREE_TYPE (arg
), integer_zero_node
);
4327 case PREINCREMENT_EXPR
:
4328 case POSTINCREMENT_EXPR
:
4329 case PREDECREMENT_EXPR
:
4330 case POSTDECREMENT_EXPR
:
4331 /* Handle complex lvalues (when permitted)
4332 by reduction to simpler cases. */
4334 val
= unary_complex_lvalue (code
, arg
);
4338 /* Increment or decrement the real part of the value,
4339 and don't change the imaginary part. */
4340 if (TREE_CODE (TREE_TYPE (arg
)) == COMPLEX_TYPE
)
4344 arg
= stabilize_reference (arg
);
4345 real
= build_unary_op (REALPART_EXPR
, arg
, 1);
4346 imag
= build_unary_op (IMAGPART_EXPR
, arg
, 1);
4347 return build (COMPLEX_EXPR
, TREE_TYPE (arg
),
4348 build_unary_op (code
, real
, 1), imag
);
4351 /* Report invalid types. */
4353 if (!(arg
= build_expr_type_conversion (WANT_ARITH
| WANT_POINTER
,
4356 if (code
== PREINCREMENT_EXPR
)
4357 errstring
="no pre-increment operator for type";
4358 else if (code
== POSTINCREMENT_EXPR
)
4359 errstring
="no post-increment operator for type";
4360 else if (code
== PREDECREMENT_EXPR
)
4361 errstring
="no pre-decrement operator for type";
4363 errstring
="no post-decrement operator for type";
4367 /* Report something read-only. */
4369 if (TYPE_READONLY (TREE_TYPE (arg
))
4370 || TREE_READONLY (arg
))
4371 readonly_error (arg
, ((code
== PREINCREMENT_EXPR
4372 || code
== POSTINCREMENT_EXPR
)
4373 ? "increment" : "decrement"),
4378 tree result_type
= TREE_TYPE (arg
);
4380 arg
= get_unwidened (arg
, 0);
4381 argtype
= TREE_TYPE (arg
);
4383 /* ARM $5.2.5 last annotation says this should be forbidden. */
4384 if (TREE_CODE (argtype
) == ENUMERAL_TYPE
)
4385 pedwarn ("ANSI C++ forbids %sing an enum",
4386 (code
== PREINCREMENT_EXPR
|| code
== POSTINCREMENT_EXPR
)
4387 ? "increment" : "decrement");
4389 /* Compute the increment. */
4391 if (TREE_CODE (argtype
) == POINTER_TYPE
)
4393 enum tree_code tmp
= TREE_CODE (TREE_TYPE (argtype
));
4394 if (TYPE_SIZE (complete_type (TREE_TYPE (argtype
))) == 0)
4395 cp_error ("cannot %s a pointer to incomplete type `%T'",
4396 ((code
== PREINCREMENT_EXPR
4397 || code
== POSTINCREMENT_EXPR
)
4398 ? "increment" : "decrement"), TREE_TYPE (argtype
));
4399 else if ((pedantic
|| warn_pointer_arith
)
4400 && (tmp
== FUNCTION_TYPE
|| tmp
== METHOD_TYPE
4401 || tmp
== VOID_TYPE
|| tmp
== OFFSET_TYPE
))
4402 cp_pedwarn ("ANSI C++ forbids %sing a pointer of type `%T'",
4403 ((code
== PREINCREMENT_EXPR
4404 || code
== POSTINCREMENT_EXPR
)
4405 ? "increment" : "decrement"), argtype
);
4406 inc
= c_sizeof_nowarn (TREE_TYPE (argtype
));
4409 inc
= integer_one_node
;
4411 inc
= cp_convert (argtype
, inc
);
4413 /* Handle incrementing a cast-expression. */
4415 switch (TREE_CODE (arg
))
4420 case FIX_TRUNC_EXPR
:
4421 case FIX_FLOOR_EXPR
:
4422 case FIX_ROUND_EXPR
:
4425 tree incremented
, modify
, value
, compound
;
4426 if (! lvalue_p (arg
) && pedantic
)
4427 pedwarn ("cast to non-reference type used as lvalue");
4428 arg
= stabilize_reference (arg
);
4429 if (code
== PREINCREMENT_EXPR
|| code
== PREDECREMENT_EXPR
)
4432 value
= save_expr (arg
);
4433 incremented
= build (((code
== PREINCREMENT_EXPR
4434 || code
== POSTINCREMENT_EXPR
)
4435 ? PLUS_EXPR
: MINUS_EXPR
),
4436 argtype
, value
, inc
);
4437 TREE_SIDE_EFFECTS (incremented
) = 1;
4439 modify
= build_modify_expr (arg
, NOP_EXPR
, incremented
);
4440 compound
= build (COMPOUND_EXPR
, TREE_TYPE (arg
), modify
, value
);
4442 /* Eliminate warning about unused result of + or -. */
4443 TREE_NO_UNUSED_WARNING (compound
) = 1;
4451 /* Complain about anything else that is not a true lvalue. */
4452 if (!lvalue_or_else (arg
, ((code
== PREINCREMENT_EXPR
4453 || code
== POSTINCREMENT_EXPR
)
4454 ? "increment" : "decrement")))
4455 return error_mark_node
;
4457 /* Forbid using -- on `bool'. */
4458 if (TREE_TYPE (arg
) == boolean_type_node
)
4460 if (code
== POSTDECREMENT_EXPR
|| code
== PREDECREMENT_EXPR
)
4462 cp_error ("invalid use of `--' on bool variable `%D'", arg
);
4463 return error_mark_node
;
4466 /* This will only work if someone can convince Kenner to accept
4467 my patch to expand_increment. (jason) */
4468 val
= build (code
, TREE_TYPE (arg
), arg
, inc
);
4470 if (code
== POSTINCREMENT_EXPR
)
4472 arg
= stabilize_reference (arg
);
4473 val
= build (MODIFY_EXPR
, TREE_TYPE (arg
), arg
,
4475 TREE_SIDE_EFFECTS (val
) = 1;
4476 arg
= save_expr (arg
);
4477 val
= build (COMPOUND_EXPR
, TREE_TYPE (arg
), val
, arg
);
4478 val
= build (COMPOUND_EXPR
, TREE_TYPE (arg
), arg
, val
);
4481 val
= build (MODIFY_EXPR
, TREE_TYPE (arg
), arg
,
4486 val
= build (code
, TREE_TYPE (arg
), arg
, inc
);
4488 TREE_SIDE_EFFECTS (val
) = 1;
4489 return cp_convert (result_type
, val
);
4493 /* Note that this operation never does default_conversion
4494 regardless of NOCONVERT. */
4496 argtype
= TREE_TYPE (arg
);
4497 if (TREE_CODE (argtype
) == REFERENCE_TYPE
)
4501 build_pointer_type (TREE_TYPE (TREE_TYPE (arg
))), arg
);
4502 TREE_CONSTANT (arg
) = TREE_CONSTANT (TREE_OPERAND (arg
, 0));
4505 else if (pedantic
&& DECL_MAIN_P (arg
))
4507 pedwarn ("taking address of function `main'");
4509 /* Let &* cancel out to simplify resulting code. */
4510 if (TREE_CODE (arg
) == INDIRECT_REF
)
4512 /* We don't need to have `current_class_ptr' wrapped in a
4513 NON_LVALUE_EXPR node. */
4514 if (arg
== current_class_ref
)
4515 return current_class_ptr
;
4517 arg
= TREE_OPERAND (arg
, 0);
4518 if (TREE_CODE (TREE_TYPE (arg
)) == REFERENCE_TYPE
)
4522 build_pointer_type (TREE_TYPE (TREE_TYPE (arg
))), arg
);
4523 TREE_CONSTANT (arg
) = TREE_CONSTANT (TREE_OPERAND (arg
, 0));
4525 else if (lvalue_p (arg
))
4526 /* Don't let this be an lvalue. */
4527 return non_lvalue (arg
);
4531 /* For &x[y], return x+y */
4532 if (TREE_CODE (arg
) == ARRAY_REF
)
4534 if (mark_addressable (TREE_OPERAND (arg
, 0)) == 0)
4535 return error_mark_node
;
4536 return build_binary_op (PLUS_EXPR
, TREE_OPERAND (arg
, 0),
4537 TREE_OPERAND (arg
, 1), 1);
4540 /* Uninstantiated types are all functions. Taking the
4541 address of a function is a no-op, so just return the
4544 if (TREE_CODE (arg
) == IDENTIFIER_NODE
4545 && IDENTIFIER_OPNAME_P (arg
))
4547 my_friendly_abort (117);
4548 /* We don't know the type yet, so just work around the problem.
4549 We know that this will resolve to an lvalue. */
4550 return build1 (ADDR_EXPR
, unknown_type_node
, arg
);
4553 if (TREE_CODE (arg
) == OVERLOAD
4554 || (TREE_CODE (arg
) == OFFSET_REF
4555 && TREE_CODE (TREE_OPERAND (arg
, 1)) == TEMPLATE_ID_EXPR
))
4556 return build1 (ADDR_EXPR
, unknown_type_node
, arg
);
4557 else if (TREE_CODE (arg
) == TREE_LIST
)
4559 if (TREE_CODE (TREE_VALUE (arg
)) == FUNCTION_DECL
)
4560 /* Unique overloaded non-member function. */
4561 return build_unary_op (ADDR_EXPR
, TREE_VALUE (arg
), 0);
4562 if (TREE_CHAIN (arg
) == NULL_TREE
4563 && TREE_CODE (TREE_VALUE (arg
)) == TREE_LIST
4564 && TREE_CODE (TREE_VALUE (TREE_VALUE (arg
))) != OVERLOAD
)
4565 /* Unique overloaded member function. */
4566 return build_unary_op (ADDR_EXPR
, TREE_VALUE (TREE_VALUE (arg
)),
4568 return build1 (ADDR_EXPR
, unknown_type_node
, arg
);
4570 else if (TREE_CODE (arg
) == TEMPLATE_ID_EXPR
)
4575 /* We don't require a match here; it's possible that the
4576 context (like a cast to a particular type) will resolve
4577 the particular choice of template. */
4578 fn
= determine_specialization (arg
,
4586 fn
= instantiate_template (fn
, targs
);
4587 mark_addressable (fn
);
4588 return build_unary_op (ADDR_EXPR
, fn
, 0);
4591 return build1 (ADDR_EXPR
, unknown_type_node
, arg
);
4594 /* Handle complex lvalues (when permitted)
4595 by reduction to simpler cases. */
4596 val
= unary_complex_lvalue (code
, arg
);
4600 switch (TREE_CODE (arg
))
4605 case FIX_TRUNC_EXPR
:
4606 case FIX_FLOOR_EXPR
:
4607 case FIX_ROUND_EXPR
:
4609 if (! lvalue_p (arg
) && pedantic
)
4610 pedwarn ("taking the address of a cast to non-reference type");
4617 /* Allow the address of a constructor if all the elements
4619 if (TREE_CODE (arg
) == CONSTRUCTOR
&& TREE_HAS_CONSTRUCTOR (arg
)
4620 && TREE_CONSTANT (arg
))
4622 /* Anything not already handled and not a true memory reference
4624 else if (TREE_CODE (argtype
) != FUNCTION_TYPE
4625 && TREE_CODE (argtype
) != METHOD_TYPE
4626 && !lvalue_or_else (arg
, "unary `&'"))
4627 return error_mark_node
;
4629 /* Ordinary case; arg is a COMPONENT_REF or a decl. */
4630 /* If the lvalue is const or volatile,
4631 merge that into the type that the address will point to. */
4632 if (TREE_CODE_CLASS (TREE_CODE (arg
)) == 'd'
4633 || TREE_CODE_CLASS (TREE_CODE (arg
)) == 'r')
4635 if (TREE_READONLY (arg
) || TREE_THIS_VOLATILE (arg
))
4636 argtype
= cp_build_type_variant (argtype
,
4637 TREE_READONLY (arg
),
4638 TREE_THIS_VOLATILE (arg
));
4641 argtype
= build_pointer_type (argtype
);
4643 if (mark_addressable (arg
) == 0)
4644 return error_mark_node
;
4649 if (TREE_CODE (arg
) == COMPONENT_REF
)
4650 addr
= build_component_addr
4652 "attempt to take address of bit-field structure member `%s'");
4654 addr
= build1 (code
, argtype
, arg
);
4656 /* Address of a static or external variable or
4657 function counts as a constant */
4659 TREE_CONSTANT (addr
) = 1;
4661 if (TREE_CODE (argtype
) == POINTER_TYPE
4662 && TREE_CODE (TREE_TYPE (argtype
)) == METHOD_TYPE
)
4664 build_ptrmemfunc_type (argtype
);
4665 addr
= build_ptrmemfunc (argtype
, addr
, 0);
4678 argtype
= TREE_TYPE (arg
);
4679 return fold (build1 (code
, argtype
, arg
));
4683 return error_mark_node
;
4687 /* If CONVERSIONS is a conversion expression or a nested sequence of such,
4688 convert ARG with the same conversions in the same order
4689 and return the result. */
4692 convert_sequence (conversions
, arg
)
4696 switch (TREE_CODE (conversions
))
4701 case FIX_TRUNC_EXPR
:
4702 case FIX_FLOOR_EXPR
:
4703 case FIX_ROUND_EXPR
:
4705 return cp_convert (TREE_TYPE (conversions
),
4706 convert_sequence (TREE_OPERAND (conversions
, 0),
4715 /* Apply unary lvalue-demanding operator CODE to the expression ARG
4716 for certain kinds of expressions which are not really lvalues
4717 but which we can accept as lvalues.
4719 If ARG is not a kind of expression we can handle, return zero. */
4722 unary_complex_lvalue (code
, arg
)
4723 enum tree_code code
;
4726 /* Handle (a, b) used as an "lvalue". */
4727 if (TREE_CODE (arg
) == COMPOUND_EXPR
)
4729 tree real_result
= build_unary_op (code
, TREE_OPERAND (arg
, 1), 0);
4730 return build (COMPOUND_EXPR
, TREE_TYPE (real_result
),
4731 TREE_OPERAND (arg
, 0), real_result
);
4734 /* Handle (a ? b : c) used as an "lvalue". */
4735 if (TREE_CODE (arg
) == COND_EXPR
4736 || TREE_CODE (arg
) == MIN_EXPR
|| TREE_CODE (arg
) == MAX_EXPR
)
4737 return rationalize_conditional_expr (code
, arg
);
4739 if (TREE_CODE (arg
) == MODIFY_EXPR
4740 || TREE_CODE (arg
) == PREINCREMENT_EXPR
4741 || TREE_CODE (arg
) == PREDECREMENT_EXPR
)
4742 return unary_complex_lvalue
4743 (code
, build (COMPOUND_EXPR
, TREE_TYPE (TREE_OPERAND (arg
, 0)),
4744 arg
, TREE_OPERAND (arg
, 0)));
4746 if (code
!= ADDR_EXPR
)
4749 /* Handle (a = b) used as an "lvalue" for `&'. */
4750 if (TREE_CODE (arg
) == MODIFY_EXPR
4751 || TREE_CODE (arg
) == INIT_EXPR
)
4753 tree real_result
= build_unary_op (code
, TREE_OPERAND (arg
, 0), 0);
4754 arg
= build (COMPOUND_EXPR
, TREE_TYPE (real_result
), arg
, real_result
);
4755 TREE_NO_UNUSED_WARNING (arg
) = 1;
4759 if (TREE_CODE (TREE_TYPE (arg
)) == FUNCTION_TYPE
4760 || TREE_CODE (TREE_TYPE (arg
)) == METHOD_TYPE
4761 || TREE_CODE (TREE_TYPE (arg
)) == OFFSET_TYPE
)
4763 /* The representation of something of type OFFSET_TYPE
4764 is really the representation of a pointer to it.
4765 Here give the representation its true type. */
4768 my_friendly_assert (TREE_CODE (arg
) != SCOPE_REF
, 313);
4770 if (TREE_CODE (arg
) != OFFSET_REF
)
4773 t
= TREE_OPERAND (arg
, 1);
4775 /* Check all this code for right semantics. */
4776 if (TREE_CODE (t
) == FUNCTION_DECL
)
4777 return build_unary_op (ADDR_EXPR
, t
, 0);
4778 if (TREE_CODE (t
) == VAR_DECL
)
4779 return build_unary_op (ADDR_EXPR
, t
, 0);
4785 if (TREE_OPERAND (arg
, 0)
4786 && (TREE_CODE (TREE_OPERAND (arg
, 0)) != NOP_EXPR
4787 || (TREE_OPERAND (TREE_OPERAND (arg
, 0), 0)
4788 != error_mark_node
)))
4789 if (TREE_CODE (t
) != FIELD_DECL
)
4791 /* Don't know if this should return address to just
4792 _DECL, or actual address resolved in this expression. */
4793 sorry ("address of bound pointer-to-member expression");
4794 return error_mark_node
;
4797 /* Add in the offset to the field. */
4798 offset
= convert (sizetype
,
4799 size_binop (EASY_DIV_EXPR
,
4800 DECL_FIELD_BITPOS (t
),
4801 size_int (BITS_PER_UNIT
)));
4803 /* We offset all pointer to data members by 1 so that we can
4804 distinguish between a null pointer to data member and the first
4805 data member of a structure. */
4806 offset
= size_binop (PLUS_EXPR
, offset
, size_int (1));
4808 type
= build_offset_type (DECL_FIELD_CONTEXT (t
), TREE_TYPE (t
));
4809 type
= build_pointer_type (type
);
4811 return cp_convert (type
, offset
);
4816 /* We permit compiler to make function calls returning
4817 objects of aggregate type look like lvalues. */
4821 if (TREE_CODE (targ
) == SAVE_EXPR
)
4822 targ
= TREE_OPERAND (targ
, 0);
4824 if (TREE_CODE (targ
) == CALL_EXPR
&& IS_AGGR_TYPE (TREE_TYPE (targ
)))
4826 if (TREE_CODE (arg
) == SAVE_EXPR
)
4829 targ
= build_cplus_new (TREE_TYPE (arg
), arg
);
4830 return build1 (ADDR_EXPR
, build_pointer_type (TREE_TYPE (arg
)), targ
);
4833 if (TREE_CODE (arg
) == SAVE_EXPR
&& TREE_CODE (targ
) == INDIRECT_REF
)
4834 return build (SAVE_EXPR
, build_pointer_type (TREE_TYPE (arg
)),
4835 TREE_OPERAND (targ
, 0), current_function_decl
, NULL
);
4838 /* Don't let anything else be handled specially. */
4842 /* Mark EXP saying that we need to be able to take the
4843 address of it; it should not be allocated in a register.
4844 Value is 1 if successful.
4846 C++: we do not allow `current_class_ptr' to be addressable. */
4849 mark_addressable (exp
)
4852 register tree x
= exp
;
4854 if (TREE_ADDRESSABLE (x
) == 1)
4858 switch (TREE_CODE (x
))
4865 x
= TREE_OPERAND (x
, 0);
4869 if (x
== current_class_ptr
)
4871 if (! flag_this_is_variable
)
4872 error ("address of `this' not available");
4873 TREE_ADDRESSABLE (x
) = 1; /* so compiler doesn't die later */
4874 put_var_into_stack (x
);
4878 if (TREE_STATIC (x
) && TREE_READONLY (x
)
4879 && DECL_RTL (x
) != 0
4880 && ! DECL_IN_MEMORY_P (x
))
4882 /* We thought this would make a good constant variable,
4883 but we were wrong. */
4884 push_obstacks_nochange ();
4885 end_temporary_allocation ();
4887 TREE_ASM_WRITTEN (x
) = 0;
4889 rest_of_decl_compilation (x
, 0, IDENTIFIER_LOCAL_VALUE (x
) == 0,
4891 TREE_ADDRESSABLE (x
) = 1;
4897 /* Caller should not be trying to mark initialized
4898 constant fields addressable. */
4899 my_friendly_assert (DECL_LANG_SPECIFIC (x
) == 0
4900 || DECL_IN_AGGR_P (x
) == 0
4902 || DECL_EXTERNAL (x
), 314);
4906 if (DECL_REGISTER (x
) && !TREE_ADDRESSABLE (x
)
4907 && !DECL_ARTIFICIAL (x
) && extra_warnings
)
4908 cp_warning ("address requested for `%D', which is declared `register'",
4910 put_var_into_stack (x
);
4911 TREE_ADDRESSABLE (x
) = 1;
4915 if (DECL_LANG_SPECIFIC (x
) != 0)
4917 x
= DECL_MAIN_VARIANT (x
);
4918 /* We have to test both conditions here. The first may be
4919 non-zero in the case of processing a default function. The
4920 second may be non-zero in the case of a template function. */
4921 if (DECL_TEMPLATE_INFO (x
) && !DECL_TEMPLATE_SPECIALIZATION (x
))
4924 TREE_ADDRESSABLE (x
) = 1;
4926 TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (x
)) = 1;
4930 TREE_ADDRESSABLE (x
) = 1;
4934 TREE_ADDRESSABLE (x
) = 1;
4935 mark_addressable (TREE_OPERAND (x
, 0));
4943 /* Build and return a conditional expression IFEXP ? OP1 : OP2. */
4946 build_x_conditional_expr (ifexp
, op1
, op2
)
4947 tree ifexp
, op1
, op2
;
4949 if (processing_template_decl
)
4950 return build_min_nt (COND_EXPR
, ifexp
, op1
, op2
);
4952 return build_new_op (COND_EXPR
, LOOKUP_NORMAL
, ifexp
, op1
, op2
);
4956 build_conditional_expr (ifexp
, op1
, op2
)
4957 tree ifexp
, op1
, op2
;
4959 register tree type1
;
4960 register tree type2
;
4961 register enum tree_code code1
;
4962 register enum tree_code code2
;
4963 register tree result_type
= NULL_TREE
;
4965 /* If second operand is omitted, it is the same as the first one;
4966 make sure it is calculated only once. */
4970 pedwarn ("ANSI C++ forbids omitting the middle term of a ?: expression");
4971 ifexp
= op1
= save_expr (ifexp
);
4974 ifexp
= cp_convert (boolean_type_node
, ifexp
);
4976 if (TREE_CODE (ifexp
) == ERROR_MARK
)
4977 return error_mark_node
;
4979 op1
= require_instantiated_type (TREE_TYPE (op2
), op1
, error_mark_node
);
4980 if (op1
== error_mark_node
)
4981 return error_mark_node
;
4982 op2
= require_instantiated_type (TREE_TYPE (op1
), op2
, error_mark_node
);
4983 if (op2
== error_mark_node
)
4984 return error_mark_node
;
4986 /* C++: REFERENCE_TYPES must be dereferenced. */
4987 type1
= TREE_TYPE (op1
);
4988 code1
= TREE_CODE (type1
);
4989 type2
= TREE_TYPE (op2
);
4990 code2
= TREE_CODE (type2
);
4992 if (code1
== REFERENCE_TYPE
)
4994 op1
= convert_from_reference (op1
);
4995 type1
= TREE_TYPE (op1
);
4996 code1
= TREE_CODE (type1
);
4998 if (code2
== REFERENCE_TYPE
)
5000 op2
= convert_from_reference (op2
);
5001 type2
= TREE_TYPE (op2
);
5002 code2
= TREE_CODE (type2
);
5005 /* Don't promote the operands separately if they promote
5006 the same way. Return the unpromoted type and let the combined
5007 value get promoted if necessary. */
5009 if (TYPE_MAIN_VARIANT (type1
) == TYPE_MAIN_VARIANT (type2
)
5010 && code2
!= ARRAY_TYPE
5011 && code2
!= FUNCTION_TYPE
5012 && code2
!= METHOD_TYPE
)
5016 if (TREE_CONSTANT (ifexp
)
5017 && (TREE_CODE (ifexp
) == INTEGER_CST
5018 || TREE_CODE (ifexp
) == ADDR_EXPR
))
5019 return (integer_zerop (ifexp
) ? op2
: op1
);
5021 if (TREE_CODE (op1
) == CONST_DECL
)
5022 op1
= DECL_INITIAL (op1
);
5023 else if (TREE_READONLY_DECL_P (op1
))
5024 op1
= decl_constant_value (op1
);
5025 if (TREE_CODE (op2
) == CONST_DECL
)
5026 op2
= DECL_INITIAL (op2
);
5027 else if (TREE_READONLY_DECL_P (op2
))
5028 op2
= decl_constant_value (op2
);
5030 type1
= cp_build_type_variant
5032 TREE_READONLY (op1
) || TREE_READONLY (op2
),
5033 TREE_THIS_VOLATILE (op1
) || TREE_THIS_VOLATILE (op2
));
5034 /* ??? This is a kludge to deal with the fact that
5035 we don't sort out integers and enums properly, yet. */
5036 result
= fold (build (COND_EXPR
, type1
, ifexp
, op1
, op2
));
5037 if (TREE_TYPE (result
) != type1
)
5038 result
= build1 (NOP_EXPR
, type1
, result
);
5039 /* Expand both sides into the same slot,
5040 hopefully the target of the ?: expression. */
5041 if (TREE_CODE (op1
) == TARGET_EXPR
&& TREE_CODE (op2
) == TARGET_EXPR
)
5043 tree slot
= build (VAR_DECL
, TREE_TYPE (result
));
5044 layout_decl (slot
, 0);
5045 result
= build (TARGET_EXPR
, TREE_TYPE (result
),
5046 slot
, result
, NULL_TREE
, NULL_TREE
);
5051 /* They don't match; promote them both and then try to reconcile them.
5052 But don't permit mismatching enum types. */
5053 if (code1
== ENUMERAL_TYPE
)
5055 if (code2
== ENUMERAL_TYPE
)
5057 cp_error ("enumeral mismatch in conditional expression: `%T' vs `%T'",
5059 return error_mark_node
;
5061 else if (extra_warnings
&& ! IS_AGGR_TYPE_CODE (code2
)
5062 && type2
!= type_promotes_to (type1
))
5063 warning ("enumeral and non-enumeral type in conditional expression");
5065 else if (extra_warnings
5066 && code2
== ENUMERAL_TYPE
&& ! IS_AGGR_TYPE_CODE (code1
)
5067 && type1
!= type_promotes_to (type2
))
5068 warning ("enumeral and non-enumeral type in conditional expression");
5070 if (code1
!= VOID_TYPE
)
5072 op1
= default_conversion (op1
);
5073 type1
= TREE_TYPE (op1
);
5074 if (TYPE_PTRMEMFUNC_P (type1
))
5075 type1
= TYPE_PTRMEMFUNC_FN_TYPE (type1
);
5076 code1
= TREE_CODE (type1
);
5078 if (code2
!= VOID_TYPE
)
5080 op2
= default_conversion (op2
);
5081 type2
= TREE_TYPE (op2
);
5082 if (TYPE_PTRMEMFUNC_P (type2
))
5083 type2
= TYPE_PTRMEMFUNC_FN_TYPE (type2
);
5084 code2
= TREE_CODE (type2
);
5087 if (code1
== RECORD_TYPE
&& code2
== RECORD_TYPE
5088 && real_lvalue_p (op1
) && real_lvalue_p (op2
)
5089 && comptypes (type1
, type2
, -1))
5091 type1
= build_reference_type (type1
);
5092 type2
= build_reference_type (type2
);
5093 result_type
= common_type (type1
, type2
);
5094 op1
= convert_to_reference (result_type
, op1
, CONV_IMPLICIT
,
5095 LOOKUP_NORMAL
, NULL_TREE
);
5096 op2
= convert_to_reference (result_type
, op2
, CONV_IMPLICIT
,
5097 LOOKUP_NORMAL
, NULL_TREE
);
5099 /* Quickly detect the usual case where op1 and op2 have the same type
5101 else if (TYPE_MAIN_VARIANT (type1
) == TYPE_MAIN_VARIANT (type2
))
5104 result_type
= type1
;
5106 result_type
= cp_build_type_variant
5108 TREE_READONLY (op1
) || TREE_READONLY (op2
),
5109 TREE_THIS_VOLATILE (op1
) || TREE_THIS_VOLATILE (op2
));
5111 else if ((code1
== INTEGER_TYPE
|| code1
== REAL_TYPE
)
5112 && (code2
== INTEGER_TYPE
|| code2
== REAL_TYPE
))
5114 result_type
= common_type (type1
, type2
);
5116 else if (code1
== VOID_TYPE
|| code2
== VOID_TYPE
)
5118 if (pedantic
&& (code1
!= VOID_TYPE
|| code2
!= VOID_TYPE
))
5119 pedwarn ("ANSI C++ forbids conditional expr with only one void side");
5120 result_type
= void_type_node
;
5122 else if (code1
== POINTER_TYPE
&& null_ptr_cst_p (op2
))
5123 result_type
= qualify_type (type1
, type2
);
5124 else if (code2
== POINTER_TYPE
&& null_ptr_cst_p (op1
))
5125 result_type
= qualify_type (type2
, type1
);
5126 else if (code1
== POINTER_TYPE
&& code2
== POINTER_TYPE
)
5128 if (comp_target_types (type1
, type2
, 1))
5129 result_type
= common_type (type1
, type2
);
5130 else if (TYPE_MAIN_VARIANT (TREE_TYPE (type1
)) == void_type_node
)
5132 if (pedantic
&& TREE_CODE (type2
) == FUNCTION_TYPE
)
5133 pedwarn ("ANSI C++ forbids conditional expr between `void *' and function pointer");
5134 result_type
= qualify_type (type1
, type2
);
5136 else if (TYPE_MAIN_VARIANT (TREE_TYPE (type2
)) == void_type_node
)
5138 if (pedantic
&& TREE_CODE (type1
) == FUNCTION_TYPE
)
5139 pedwarn ("ANSI C++ forbids conditional expr between `void *' and function pointer");
5140 result_type
= qualify_type (type2
, type1
);
5143 else if (comptypes (type2
, type1
, 0))
5144 result_type
= type2
;
5145 else if (IS_AGGR_TYPE (TREE_TYPE (type1
))
5146 && IS_AGGR_TYPE (TREE_TYPE (type2
))
5147 && (result_type
= common_base_type (TREE_TYPE (type1
),
5148 TREE_TYPE (type2
))))
5150 if (result_type
== error_mark_node
)
5152 cp_error ("common base type of types `%T' and `%T' is ambiguous",
5153 TREE_TYPE (type1
), TREE_TYPE (type2
));
5154 result_type
= ptr_type_node
;
5159 && result_type
!= TREE_TYPE (type1
)
5160 && result_type
!= TREE_TYPE (type2
))
5161 cp_pedwarn ("`%T' and `%T' converted to `%T *' in conditional expression",
5162 type1
, type2
, result_type
);
5164 result_type
= build_pointer_type (result_type
);
5169 pedwarn ("pointer type mismatch in conditional expression");
5170 result_type
= ptr_type_node
;
5173 else if (code1
== POINTER_TYPE
&& code2
== INTEGER_TYPE
)
5175 pedwarn ("pointer/integer type mismatch in conditional expression");
5176 result_type
= type1
;
5178 else if (code2
== POINTER_TYPE
&& code1
== INTEGER_TYPE
)
5180 pedwarn ("pointer/integer type mismatch in conditional expression");
5181 result_type
= type2
;
5186 /* The match does not look good. If either is
5187 an aggregate value, try converting to a scalar type. */
5188 if (code1
== RECORD_TYPE
&& code2
== RECORD_TYPE
)
5190 cp_error ("aggregate mismatch in conditional expression: `%T' vs `%T'",
5192 return error_mark_node
;
5194 /* Warning: this code assumes that conversion between cv-variants of
5195 a type is done using NOP_EXPRs. */
5196 if (code1
== RECORD_TYPE
&& TYPE_HAS_CONVERSION (type1
))
5198 /* There are other types besides pointers and records. */
5200 if (code2
== POINTER_TYPE
)
5201 tmp
= build_pointer_type
5202 (build_type_variant (TREE_TYPE (type2
), 1, 1));
5205 tmp
= build_type_conversion (CONVERT_EXPR
, tmp
, op1
, 0);
5206 if (tmp
== NULL_TREE
)
5208 cp_error ("incompatible types `%T' and `%T' in `?:'",
5210 return error_mark_node
;
5212 if (tmp
== error_mark_node
)
5213 error ("ambiguous pointer conversion");
5216 result_type
= common_type (type2
, TREE_TYPE (tmp
));
5219 else if (code2
== RECORD_TYPE
&& TYPE_HAS_CONVERSION (type2
))
5222 if (code1
== POINTER_TYPE
)
5223 tmp
= build_pointer_type
5224 (build_type_variant (TREE_TYPE (type1
), 1, 1));
5228 tmp
= build_type_conversion (CONVERT_EXPR
, tmp
, op2
, 0);
5229 if (tmp
== NULL_TREE
)
5231 cp_error ("incompatible types `%T' and `%T' in `?:'",
5233 return error_mark_node
;
5235 if (tmp
== error_mark_node
)
5236 error ("ambiguous pointer conversion");
5239 result_type
= common_type (type1
, TREE_TYPE (tmp
));
5242 else if (flag_cond_mismatch
)
5243 result_type
= void_type_node
;
5246 error ("type mismatch in conditional expression");
5247 return error_mark_node
;
5251 if (TREE_CODE (result_type
) == POINTER_TYPE
5252 && TREE_CODE (TREE_TYPE (result_type
)) == METHOD_TYPE
)
5253 result_type
= build_ptrmemfunc_type (result_type
);
5255 if (result_type
!= TREE_TYPE (op1
))
5256 op1
= convert_for_initialization
5257 (NULL_TREE
, result_type
, op1
, LOOKUP_NORMAL
, "converting", NULL_TREE
, 0);
5258 if (result_type
!= TREE_TYPE (op2
))
5259 op2
= convert_for_initialization
5260 (NULL_TREE
, result_type
, op2
, LOOKUP_NORMAL
, "converting", NULL_TREE
, 0);
5262 if (TREE_CONSTANT (ifexp
))
5263 return integer_zerop (ifexp
) ? op2
: op1
;
5265 return convert_from_reference
5266 (fold (build (COND_EXPR
, result_type
, ifexp
, op1
, op2
)));
5269 /* Handle overloading of the ',' operator when needed. Otherwise,
5270 this function just builds an expression list. */
5273 build_x_compound_expr (list
)
5276 tree rest
= TREE_CHAIN (list
);
5279 if (processing_template_decl
)
5280 return build_min_nt (COMPOUND_EXPR
, list
, NULL_TREE
);
5282 if (rest
== NULL_TREE
)
5283 return build_compound_expr (list
);
5285 result
= build_opfncall (COMPOUND_EXPR
, LOOKUP_NORMAL
,
5286 TREE_VALUE (list
), TREE_VALUE (rest
), NULL_TREE
);
5288 return build_x_compound_expr (expr_tree_cons (NULL_TREE
, result
,
5289 TREE_CHAIN (rest
)));
5291 if (! TREE_SIDE_EFFECTS (TREE_VALUE (list
)))
5293 /* the left-hand operand of a comma expression is like an expression
5294 statement: we should warn if it doesn't have any side-effects,
5295 unless it was explicitly cast to (void). */
5296 if ((extra_warnings
|| warn_unused
)
5297 && !(TREE_CODE (TREE_VALUE(list
)) == CONVERT_EXPR
5298 && TREE_TYPE (TREE_VALUE(list
)) == void_type_node
))
5299 warning("left-hand operand of comma expression has no effect");
5301 #if 0 /* this requires a gcc backend patch to export warn_if_unused_value */
5302 else if (warn_unused
)
5303 warn_if_unused_value (TREE_VALUE(list
));
5306 return build_compound_expr
5307 (expr_tree_cons (NULL_TREE
, TREE_VALUE (list
),
5308 build_expr_list (NULL_TREE
,
5309 build_x_compound_expr (rest
))));
5312 /* Given a list of expressions, return a compound expression
5313 that performs them all and returns the value of the last of them. */
5316 build_compound_expr (list
)
5321 if (TREE_READONLY_DECL_P (TREE_VALUE (list
)))
5322 TREE_VALUE (list
) = decl_constant_value (TREE_VALUE (list
));
5324 if (TREE_CHAIN (list
) == 0)
5326 /* build_c_cast puts on a NOP_EXPR to make the result not an lvalue.
5327 Strip such NOP_EXPRs, since LIST is used in non-lvalue context. */
5328 if (TREE_CODE (list
) == NOP_EXPR
5329 && TREE_TYPE (list
) == TREE_TYPE (TREE_OPERAND (list
, 0)))
5330 list
= TREE_OPERAND (list
, 0);
5332 /* Convert arrays to pointers. */
5333 if (TREE_CODE (TREE_TYPE (TREE_VALUE (list
))) == ARRAY_TYPE
)
5334 return default_conversion (TREE_VALUE (list
));
5336 return TREE_VALUE (list
);
5339 rest
= build_compound_expr (TREE_CHAIN (list
));
5341 /* When pedantic, a compound expression cannot be a constant expression. */
5342 if (! TREE_SIDE_EFFECTS (TREE_VALUE (list
)) && ! pedantic
)
5345 return build (COMPOUND_EXPR
, TREE_TYPE (rest
),
5346 break_out_cleanups (TREE_VALUE (list
)), rest
);
5350 build_static_cast (type
, expr
)
5356 if (type
== error_mark_node
|| expr
== error_mark_node
)
5357 return error_mark_node
;
5359 if (TREE_CODE (expr
) == OFFSET_REF
)
5360 expr
= resolve_offset_ref (expr
);
5362 if (processing_template_decl
)
5364 tree t
= build_min (STATIC_CAST_EXPR
, copy_to_permanent (type
),
5369 /* build_c_cast puts on a NOP_EXPR to make the result not an lvalue.
5370 Strip such NOP_EXPRs if VALUE is being used in non-lvalue context. */
5371 if (TREE_CODE (type
) != REFERENCE_TYPE
5372 && TREE_CODE (expr
) == NOP_EXPR
5373 && TREE_TYPE (expr
) == TREE_TYPE (TREE_OPERAND (expr
, 0)))
5374 expr
= TREE_OPERAND (expr
, 0);
5376 if (TREE_CODE (type
) == VOID_TYPE
)
5377 return build1 (CONVERT_EXPR
, type
, expr
);
5379 if (type_unknown_p (expr
))
5381 expr
= instantiate_type (type
, expr
, 1);
5382 if (expr
== error_mark_node
)
5383 return error_mark_node
;
5386 if (TREE_CODE (type
) == REFERENCE_TYPE
)
5387 return (convert_from_reference
5388 (convert_to_reference (type
, expr
, CONV_STATIC
|CONV_IMPLICIT
,
5389 LOOKUP_COMPLAIN
, NULL_TREE
)));
5391 if (IS_AGGR_TYPE (type
))
5392 return build_cplus_new
5393 (type
, (build_method_call
5394 (NULL_TREE
, ctor_identifier
, build_expr_list (NULL_TREE
, expr
),
5395 TYPE_BINFO (type
), LOOKUP_NORMAL
)));
5397 expr
= decay_conversion (expr
);
5398 intype
= TREE_TYPE (expr
);
5400 /* FIXME handle casting to array type. */
5403 if (can_convert_arg (type
, intype
, expr
))
5405 else if (TYPE_PTROB_P (type
) && TYPE_PTROB_P (intype
))
5408 if (IS_AGGR_TYPE (TREE_TYPE (type
)) && IS_AGGR_TYPE (TREE_TYPE (intype
))
5409 && (TYPE_READONLY (TREE_TYPE (type
))
5410 >= TYPE_READONLY (TREE_TYPE (intype
)))
5411 && (TYPE_VOLATILE (TREE_TYPE (type
))
5412 >= TYPE_VOLATILE (TREE_TYPE (intype
)))
5413 && (binfo
= get_binfo (TREE_TYPE (intype
), TREE_TYPE (type
), 0))
5414 && ! TREE_VIA_VIRTUAL (binfo
))
5417 else if (TYPE_PTRMEM_P (type
) && TYPE_PTRMEM_P (intype
))
5419 if (comptypes (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type
))),
5420 TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (intype
))), 1)
5421 && (TYPE_READONLY (TREE_TYPE (TREE_TYPE (type
)))
5422 >= TYPE_READONLY (TREE_TYPE (TREE_TYPE (intype
))))
5423 && (TYPE_VOLATILE (TREE_TYPE (TREE_TYPE (type
)))
5424 >= TYPE_VOLATILE (TREE_TYPE (TREE_TYPE (intype
))))
5425 && (binfo
= get_binfo (TYPE_OFFSET_BASETYPE (intype
),
5426 TYPE_OFFSET_BASETYPE (type
), 0))
5427 && ! TREE_VIA_VIRTUAL (binfo
))
5430 else if (TREE_CODE (intype
) != BOOLEAN_TYPE
5431 && TREE_CODE (type
) != ARRAY_TYPE
5432 && TREE_CODE (type
) != FUNCTION_TYPE
5433 && can_convert (intype
, type
))
5437 return build_c_cast (type
, expr
);
5439 cp_error ("static_cast from `%T' to `%T'", intype
, type
);
5440 return error_mark_node
;
5444 build_reinterpret_cast (type
, expr
)
5449 if (type
== error_mark_node
|| expr
== error_mark_node
)
5450 return error_mark_node
;
5452 if (TREE_CODE (expr
) == OFFSET_REF
)
5453 expr
= resolve_offset_ref (expr
);
5455 if (processing_template_decl
)
5457 tree t
= build_min (REINTERPRET_CAST_EXPR
,
5458 copy_to_permanent (type
), expr
);
5462 if (TREE_CODE (type
) != REFERENCE_TYPE
)
5464 expr
= decay_conversion (expr
);
5466 /* build_c_cast puts on a NOP_EXPR to make the result not an lvalue.
5467 Strip such NOP_EXPRs if VALUE is being used in non-lvalue context. */
5468 if (TREE_CODE (expr
) == NOP_EXPR
5469 && TREE_TYPE (expr
) == TREE_TYPE (TREE_OPERAND (expr
, 0)))
5470 expr
= TREE_OPERAND (expr
, 0);
5473 if (type_unknown_p (expr
))
5475 expr
= instantiate_type (type
, expr
, 1);
5476 if (expr
== error_mark_node
)
5477 return error_mark_node
;
5480 intype
= TREE_TYPE (expr
);
5482 if (TREE_CODE (type
) == REFERENCE_TYPE
)
5484 if (! real_lvalue_p (expr
))
5486 cp_error ("reinterpret_cast from `%T' rvalue to `%T'", intype
, type
);
5487 return error_mark_node
;
5489 expr
= build_unary_op (ADDR_EXPR
, expr
, 0);
5490 if (expr
!= error_mark_node
)
5491 expr
= build_reinterpret_cast
5492 (build_pointer_type (TREE_TYPE (type
)), expr
);
5493 if (expr
!= error_mark_node
)
5494 expr
= build_indirect_ref (expr
, 0);
5497 else if (comptypes (TYPE_MAIN_VARIANT (intype
), TYPE_MAIN_VARIANT (type
), 1))
5498 return build_static_cast (type
, expr
);
5500 if (TYPE_PTR_P (type
) && (TREE_CODE (intype
) == INTEGER_TYPE
5501 || TREE_CODE (intype
) == ENUMERAL_TYPE
))
5503 else if (TREE_CODE (type
) == INTEGER_TYPE
&& TYPE_PTR_P (intype
))
5505 if (TYPE_PRECISION (type
) < TYPE_PRECISION (intype
))
5506 cp_pedwarn ("reinterpret_cast from `%T' to `%T' loses precision",
5509 else if ((TYPE_PTRFN_P (type
) && TYPE_PTRFN_P (intype
))
5510 || (TYPE_PTRMEMFUNC_P (type
) && TYPE_PTRMEMFUNC_P (intype
)))
5512 if (TREE_READONLY_DECL_P (expr
))
5513 expr
= decl_constant_value (expr
);
5514 return fold (build1 (NOP_EXPR
, type
, expr
));
5516 else if ((TYPE_PTRMEM_P (type
) && TYPE_PTRMEM_P (intype
))
5517 || (TYPE_PTROBV_P (type
) && TYPE_PTROBV_P (intype
)))
5519 if (! comp_ptr_ttypes_reinterpret (TREE_TYPE (type
), TREE_TYPE (intype
)))
5520 cp_pedwarn ("reinterpret_cast from `%T' to `%T' casts away const (or volatile)",
5523 if (TREE_READONLY_DECL_P (expr
))
5524 expr
= decl_constant_value (expr
);
5525 return fold (build1 (NOP_EXPR
, type
, expr
));
5527 else if ((TYPE_PTRFN_P (type
) && TYPE_PTROBV_P (intype
))
5528 || (TYPE_PTRFN_P (type
) && TYPE_PTROBV_P (intype
)))
5530 pedwarn ("ANSI C++ forbids casting between pointers to functions and objects");
5531 if (TREE_READONLY_DECL_P (expr
))
5532 expr
= decl_constant_value (expr
);
5533 return fold (build1 (NOP_EXPR
, type
, expr
));
5537 cp_error ("reinterpret_cast from `%T' to `%T'", intype
, type
);
5538 return error_mark_node
;
5541 return cp_convert (type
, expr
);
5545 build_const_cast (type
, expr
)
5550 if (type
== error_mark_node
|| expr
== error_mark_node
)
5551 return error_mark_node
;
5553 if (TREE_CODE (expr
) == OFFSET_REF
)
5554 expr
= resolve_offset_ref (expr
);
5556 if (processing_template_decl
)
5558 tree t
= build_min (CONST_CAST_EXPR
, copy_to_permanent (type
),
5563 if (TREE_CODE (type
) != REFERENCE_TYPE
)
5565 expr
= decay_conversion (expr
);
5567 /* build_c_cast puts on a NOP_EXPR to make the result not an lvalue.
5568 Strip such NOP_EXPRs if VALUE is being used in non-lvalue context. */
5569 if (TREE_CODE (expr
) == NOP_EXPR
5570 && TREE_TYPE (expr
) == TREE_TYPE (TREE_OPERAND (expr
, 0)))
5571 expr
= TREE_OPERAND (expr
, 0);
5574 if (type_unknown_p (expr
))
5576 expr
= instantiate_type (type
, expr
, 1);
5577 if (expr
== error_mark_node
)
5578 return error_mark_node
;
5581 intype
= TREE_TYPE (expr
);
5583 if (comptypes (TYPE_MAIN_VARIANT (intype
), TYPE_MAIN_VARIANT (type
), 1))
5584 return build_static_cast (type
, expr
);
5585 else if (TREE_CODE (type
) == REFERENCE_TYPE
)
5587 if (! real_lvalue_p (expr
))
5589 cp_error ("const_cast from `%T' rvalue to `%T'", intype
, type
);
5590 return error_mark_node
;
5593 if (comp_ptr_ttypes_const (TREE_TYPE (type
), intype
))
5595 expr
= build_unary_op (ADDR_EXPR
, expr
, 0);
5596 expr
= build1 (NOP_EXPR
, type
, expr
);
5597 return convert_from_reference (expr
);
5600 else if (TREE_CODE (type
) == POINTER_TYPE
5601 && TREE_CODE (intype
) == POINTER_TYPE
5602 && comp_ptr_ttypes_const (TREE_TYPE (type
), TREE_TYPE (intype
)))
5603 return cp_convert (type
, expr
);
5605 cp_error ("const_cast from `%T' to `%T'", intype
, type
);
5606 return error_mark_node
;
5609 /* Build an expression representing a cast to type TYPE of expression EXPR.
5611 ALLOW_NONCONVERTING is true if we should allow non-converting constructors
5612 when doing the cast. */
5615 build_c_cast (type
, expr
)
5618 register tree value
= expr
;
5620 if (type
== error_mark_node
|| expr
== error_mark_node
)
5621 return error_mark_node
;
5623 /* build_c_cast puts on a NOP_EXPR to make the result not an lvalue.
5624 Strip such NOP_EXPRs if VALUE is being used in non-lvalue context. */
5625 if (TREE_CODE (type
) != REFERENCE_TYPE
5626 && TREE_CODE (value
) == NOP_EXPR
5627 && TREE_TYPE (value
) == TREE_TYPE (TREE_OPERAND (value
, 0)))
5628 value
= TREE_OPERAND (value
, 0);
5630 if (TREE_TYPE (expr
)
5631 && TREE_CODE (TREE_TYPE (expr
)) == OFFSET_TYPE
5632 && TREE_CODE (type
) != OFFSET_TYPE
)
5633 value
= resolve_offset_ref (value
);
5635 if (TREE_CODE (type
) == ARRAY_TYPE
)
5637 /* Allow casting from T1* to T2[] because Cfront allows it.
5638 NIHCL uses it. It is not valid ANSI C however, and hence, not
5640 if (TREE_CODE (TREE_TYPE (expr
)) == POINTER_TYPE
)
5643 pedwarn ("ANSI C++ forbids casting to an array type");
5644 type
= build_pointer_type (TREE_TYPE (type
));
5648 error ("ANSI C++ forbids casting to an array type");
5649 return error_mark_node
;
5653 if (TREE_CODE (type
) == FUNCTION_TYPE
5654 || TREE_CODE (type
) == METHOD_TYPE
)
5656 cp_error ("casting to function type `%T'", type
);
5657 return error_mark_node
;
5660 if (IS_SIGNATURE (type
))
5662 error ("cast specifies signature type");
5663 return error_mark_node
;
5666 if (processing_template_decl
)
5668 tree t
= build_min (CAST_EXPR
, type
,
5669 min_tree_cons (NULL_TREE
, value
, NULL_TREE
));
5673 if (TREE_CODE (type
) == VOID_TYPE
)
5674 value
= build1 (CONVERT_EXPR
, type
, value
);
5675 else if (TREE_TYPE (value
) == NULL_TREE
5676 || type_unknown_p (value
))
5678 value
= instantiate_type (type
, value
, 1);
5680 if (value
== error_mark_node
)
5681 return error_mark_node
;
5687 /* Convert functions and arrays to pointers and
5688 convert references to their expanded types,
5689 but don't convert any other types. If, however, we are
5690 casting to a class type, there's no reason to do this: the
5691 cast will only succeed if there is a converting constructor,
5692 and the default conversions will be done at that point. In
5693 fact, doing the default conversion here is actually harmful
5697 struct S { S(const A&); };
5699 since we don't want the array-to-pointer conversion done. */
5700 if (!IS_AGGR_TYPE (type
))
5702 if (TREE_CODE (TREE_TYPE (value
)) == FUNCTION_TYPE
5703 || (TREE_CODE (TREE_TYPE (value
)) == METHOD_TYPE
5704 /* Don't do the default conversion if we want a
5705 pointer to a function. */
5706 && ! (TREE_CODE (type
) == POINTER_TYPE
5707 && TREE_CODE (TREE_TYPE (type
)) == FUNCTION_TYPE
))
5708 || TREE_CODE (TREE_TYPE (value
)) == ARRAY_TYPE
5709 || TREE_CODE (TREE_TYPE (value
)) == REFERENCE_TYPE
)
5710 value
= default_conversion (value
);
5712 else if (TREE_CODE (TREE_TYPE (value
)) == REFERENCE_TYPE
)
5713 /* However, even for class types, we still need to strip away
5714 the reference type, since the call to convert_force below
5715 does not expect the input expression to be of reference
5717 value
= convert_from_reference (value
);
5719 otype
= TREE_TYPE (value
);
5721 /* Optionally warn about potentially worrisome casts. */
5724 && TREE_CODE (type
) == POINTER_TYPE
5725 && TREE_CODE (otype
) == POINTER_TYPE
)
5727 /* For C++ we make these regular warnings, rather than
5728 softening them into pedwarns. */
5729 if (TYPE_VOLATILE (TREE_TYPE (otype
))
5730 && ! TYPE_VOLATILE (TREE_TYPE (type
)))
5731 warning ("cast discards `volatile' from pointer target type");
5732 if (TYPE_READONLY (TREE_TYPE (otype
))
5733 && ! TYPE_READONLY (TREE_TYPE (type
)))
5734 warning ("cast discards `const' from pointer target type");
5737 /* Warn about possible alignment problems. */
5738 if (STRICT_ALIGNMENT
&& warn_cast_align
5739 && TREE_CODE (type
) == POINTER_TYPE
5740 && TREE_CODE (otype
) == POINTER_TYPE
5741 && TREE_CODE (TREE_TYPE (otype
)) != VOID_TYPE
5742 && TREE_CODE (TREE_TYPE (otype
)) != FUNCTION_TYPE
5743 && TYPE_ALIGN (TREE_TYPE (type
)) > TYPE_ALIGN (TREE_TYPE (otype
)))
5744 warning ("cast increases required alignment of target type");
5747 /* We should see about re-enabling these, they seem useful to
5749 if (TREE_CODE (type
) == INTEGER_TYPE
5750 && TREE_CODE (otype
) == POINTER_TYPE
5751 && TYPE_PRECISION (type
) != TYPE_PRECISION (otype
))
5752 warning ("cast from pointer to integer of different size");
5754 if (TREE_CODE (type
) == POINTER_TYPE
5755 && TREE_CODE (otype
) == INTEGER_TYPE
5756 && TYPE_PRECISION (type
) != TYPE_PRECISION (otype
)
5757 /* Don't warn about converting 0 to pointer,
5758 provided the 0 was explicit--not cast or made by folding. */
5759 && !(TREE_CODE (value
) == INTEGER_CST
&& integer_zerop (value
)))
5760 warning ("cast to pointer from integer of different size");
5763 if (TREE_CODE (type
) == REFERENCE_TYPE
)
5764 value
= (convert_from_reference
5765 (convert_to_reference (type
, value
, CONV_C_CAST
,
5766 LOOKUP_COMPLAIN
, NULL_TREE
)));
5771 if (TREE_READONLY_DECL_P (value
))
5772 value
= decl_constant_value (value
);
5775 value
= convert_force (type
, value
, CONV_C_CAST
);
5777 /* Ignore any integer overflow caused by the cast. */
5778 if (TREE_CODE (value
) == INTEGER_CST
)
5780 TREE_OVERFLOW (value
) = TREE_OVERFLOW (ovalue
);
5781 TREE_CONSTANT_OVERFLOW (value
) = TREE_CONSTANT_OVERFLOW (ovalue
);
5786 /* Always produce some operator for an explicit cast,
5787 so we can tell (for -pedantic) that the cast is no lvalue. */
5788 if (TREE_CODE (type
) != REFERENCE_TYPE
&& value
== expr
5789 && real_lvalue_p (value
))
5790 value
= non_lvalue (value
);
5795 /* Build an assignment expression of lvalue LHS from value RHS.
5796 MODIFYCODE is the code for a binary operator that we use
5797 to combine the old value of LHS with RHS to get the new value.
5798 Or else MODIFYCODE is NOP_EXPR meaning do a simple assignment.
5800 C++: If MODIFYCODE is INIT_EXPR, then leave references unbashed. */
5803 build_modify_expr (lhs
, modifycode
, rhs
)
5805 enum tree_code modifycode
;
5808 register tree result
;
5810 tree lhstype
= TREE_TYPE (lhs
);
5811 tree olhstype
= lhstype
;
5814 /* Avoid duplicate error messages from operands that had errors. */
5815 if (lhs
== error_mark_node
|| rhs
== error_mark_node
)
5816 return error_mark_node
;
5818 /* Types that aren't fully specified cannot be used in assignments. */
5819 lhs
= require_complete_type (lhs
);
5823 /* Handle assignment to signature pointers/refs. */
5825 if (TYPE_LANG_SPECIFIC (lhstype
)
5826 && (IS_SIGNATURE_POINTER (lhstype
) || IS_SIGNATURE_REFERENCE (lhstype
)))
5828 return build_signature_pointer_constructor (lhs
, rhs
);
5831 /* Handle control structure constructs used as "lvalues". */
5833 switch (TREE_CODE (lhs
))
5835 /* Handle --foo = 5; as these are valid constructs in C++ */
5836 case PREDECREMENT_EXPR
:
5837 case PREINCREMENT_EXPR
:
5838 if (TREE_SIDE_EFFECTS (TREE_OPERAND (lhs
, 0)))
5839 lhs
= build (TREE_CODE (lhs
), TREE_TYPE (lhs
),
5840 stabilize_reference (TREE_OPERAND (lhs
, 0)),
5841 TREE_OPERAND (lhs
, 1));
5842 return build (COMPOUND_EXPR
, lhstype
,
5844 build_modify_expr (TREE_OPERAND (lhs
, 0),
5847 /* Handle (a, b) used as an "lvalue". */
5849 newrhs
= build_modify_expr (TREE_OPERAND (lhs
, 1),
5851 if (newrhs
== error_mark_node
)
5852 return error_mark_node
;
5853 return build (COMPOUND_EXPR
, lhstype
,
5854 TREE_OPERAND (lhs
, 0), newrhs
);
5857 newrhs
= build_modify_expr (TREE_OPERAND (lhs
, 0), modifycode
, rhs
);
5858 if (newrhs
== error_mark_node
)
5859 return error_mark_node
;
5860 return build (COMPOUND_EXPR
, lhstype
, lhs
, newrhs
);
5862 /* Handle (a ? b : c) used as an "lvalue". */
5864 rhs
= save_expr (rhs
);
5866 /* Produce (a ? (b = rhs) : (c = rhs))
5867 except that the RHS goes through a save-expr
5868 so the code to compute it is only emitted once. */
5870 = build_conditional_expr (TREE_OPERAND (lhs
, 0),
5871 build_modify_expr (cp_convert (TREE_TYPE (lhs
), TREE_OPERAND (lhs
, 1)),
5873 build_modify_expr (cp_convert (TREE_TYPE (lhs
), TREE_OPERAND (lhs
, 2)),
5875 if (cond
== error_mark_node
)
5877 /* Make sure the code to compute the rhs comes out
5878 before the split. */
5879 return build (COMPOUND_EXPR
, TREE_TYPE (lhs
),
5880 /* Case to void to suppress warning
5881 from warn_if_unused_value. */
5882 cp_convert (void_type_node
, rhs
), cond
);
5889 if (TREE_CODE (lhs
) == OFFSET_REF
)
5891 if (TREE_OPERAND (lhs
, 0) == NULL_TREE
)
5893 /* Static class member? */
5894 tree member
= TREE_OPERAND (lhs
, 1);
5895 if (TREE_CODE (member
) == VAR_DECL
)
5899 compiler_error ("invalid static class member");
5900 return error_mark_node
;
5904 lhs
= resolve_offset_ref (lhs
);
5906 olhstype
= lhstype
= TREE_TYPE (lhs
);
5909 if (TREE_CODE (lhstype
) == REFERENCE_TYPE
5910 && modifycode
!= INIT_EXPR
)
5912 lhs
= convert_from_reference (lhs
);
5913 olhstype
= lhstype
= TREE_TYPE (lhs
);
5916 /* If a binary op has been requested, combine the old LHS value with the RHS
5917 producing the value we should actually store into the LHS. */
5919 if (modifycode
== INIT_EXPR
)
5921 if (! IS_AGGR_TYPE (lhstype
))
5922 /* Do the default thing */;
5925 result
= build_method_call (lhs
, ctor_identifier
,
5926 build_expr_list (NULL_TREE
, rhs
),
5927 TYPE_BINFO (lhstype
), LOOKUP_NORMAL
);
5928 if (result
== NULL_TREE
)
5929 return error_mark_node
;
5933 else if (modifycode
== NOP_EXPR
)
5935 /* `operator=' is not an inheritable operator. */
5936 if (! IS_AGGR_TYPE (lhstype
))
5937 /* Do the default thing */;
5940 result
= build_opfncall (MODIFY_EXPR
, LOOKUP_NORMAL
,
5941 lhs
, rhs
, make_node (NOP_EXPR
));
5942 if (result
== NULL_TREE
)
5943 return error_mark_node
;
5948 else if (PROMOTES_TO_AGGR_TYPE (lhstype
, REFERENCE_TYPE
))
5950 my_friendly_abort (978652);
5954 lhs
= stabilize_reference (lhs
);
5955 newrhs
= build_binary_op (modifycode
, lhs
, rhs
, 1);
5956 if (newrhs
== error_mark_node
)
5958 cp_error (" in evaluation of `%Q(%#T, %#T)'", modifycode
,
5959 TREE_TYPE (lhs
), TREE_TYPE (rhs
));
5960 return error_mark_node
;
5964 /* Handle a cast used as an "lvalue".
5965 We have already performed any binary operator using the value as cast.
5966 Now convert the result to the cast type of the lhs,
5967 and then true type of the lhs and store it there;
5968 then convert result back to the cast type to be the value
5969 of the assignment. */
5971 switch (TREE_CODE (lhs
))
5976 case FIX_TRUNC_EXPR
:
5977 case FIX_FLOOR_EXPR
:
5978 case FIX_ROUND_EXPR
:
5980 if (TREE_CODE (TREE_TYPE (newrhs
)) == ARRAY_TYPE
5981 || TREE_CODE (TREE_TYPE (newrhs
)) == FUNCTION_TYPE
5982 || TREE_CODE (TREE_TYPE (newrhs
)) == METHOD_TYPE
5983 || TREE_CODE (TREE_TYPE (newrhs
)) == OFFSET_TYPE
)
5984 newrhs
= default_conversion (newrhs
);
5986 tree inner_lhs
= TREE_OPERAND (lhs
, 0);
5989 /* WP 5.4.1: The result is an lvalue if T is a reference type,
5990 otherwise the result is an rvalue. */
5991 if (! lvalue_p (lhs
))
5992 pedwarn ("ANSI C++ forbids cast to non-reference type used as lvalue");
5994 result
= build_modify_expr (inner_lhs
, NOP_EXPR
,
5995 cp_convert (TREE_TYPE (inner_lhs
),
5996 cp_convert (lhstype
, newrhs
)));
5997 if (result
== error_mark_node
)
5999 return cp_convert (TREE_TYPE (lhs
), result
);
6006 /* Now we have handled acceptable kinds of LHS that are not truly lvalues.
6007 Reject anything strange now. */
6009 if (!lvalue_or_else (lhs
, "assignment"))
6010 return error_mark_node
;
6012 GNU_xref_assign (lhs
);
6014 /* Warn about storing in something that is `const'. */
6015 /* For C++, don't warn if this is initialization. */
6016 if (modifycode
!= INIT_EXPR
6017 /* For assignment to `const' signature pointer/reference fields,
6018 don't warn either, we already printed a better message before. */
6019 && ! (TREE_CODE (lhs
) == COMPONENT_REF
6020 && (IS_SIGNATURE_POINTER (TREE_TYPE (TREE_OPERAND (lhs
, 0)))
6021 || IS_SIGNATURE_REFERENCE (TREE_TYPE (TREE_OPERAND (lhs
, 0)))))
6022 && (TREE_READONLY (lhs
) || TYPE_READONLY (lhstype
)
6023 || ((TREE_CODE (lhstype
) == RECORD_TYPE
6024 || TREE_CODE (lhstype
) == UNION_TYPE
)
6025 && C_TYPE_FIELDS_READONLY (lhstype
))
6026 || (TREE_CODE (lhstype
) == REFERENCE_TYPE
6027 && TYPE_READONLY (TREE_TYPE (lhstype
)))))
6028 readonly_error (lhs
, "assignment", 0);
6030 /* If storing into a structure or union member,
6031 it has probably been given type `int'.
6032 Compute the type that would go with
6033 the actual amount of storage the member occupies. */
6035 if (TREE_CODE (lhs
) == COMPONENT_REF
6036 && (TREE_CODE (lhstype
) == INTEGER_TYPE
6037 || TREE_CODE (lhstype
) == REAL_TYPE
6038 || TREE_CODE (lhstype
) == ENUMERAL_TYPE
))
6040 lhstype
= TREE_TYPE (get_unwidened (lhs
, 0));
6042 /* If storing in a field that is in actuality a short or narrower
6043 than one, we must store in the field in its actual type. */
6045 if (lhstype
!= TREE_TYPE (lhs
))
6047 lhs
= copy_node (lhs
);
6048 TREE_TYPE (lhs
) = lhstype
;
6052 /* check to see if there is an assignment to `this' */
6053 if (lhs
== current_class_ptr
)
6055 if (flag_this_is_variable
> 0
6056 && DECL_NAME (current_function_decl
) != NULL_TREE
6057 && (DECL_NAME (current_function_decl
)
6058 != constructor_name (current_class_type
)))
6059 warning ("assignment to `this' not in constructor or destructor");
6060 current_function_just_assigned_this
= 1;
6063 /* The TREE_TYPE of RHS may be TYPE_UNKNOWN. This can happen
6064 when the type of RHS is not yet known, i.e. its type
6065 is inherited from LHS. */
6066 rhs
= require_instantiated_type (lhstype
, newrhs
, error_mark_node
);
6067 if (rhs
== error_mark_node
)
6068 return error_mark_node
;
6071 if (modifycode
!= INIT_EXPR
)
6073 /* Make modifycode now either a NOP_EXPR or an INIT_EXPR. */
6074 modifycode
= NOP_EXPR
;
6075 /* Reference-bashing */
6076 if (TREE_CODE (lhstype
) == REFERENCE_TYPE
)
6078 tree tmp
= convert_from_reference (lhs
);
6079 lhstype
= TREE_TYPE (tmp
);
6080 if (TYPE_SIZE (lhstype
) == 0)
6082 incomplete_type_error (lhs
, lhstype
);
6083 return error_mark_node
;
6088 if (TREE_CODE (TREE_TYPE (newrhs
)) == REFERENCE_TYPE
)
6090 tree tmp
= convert_from_reference (newrhs
);
6091 if (TYPE_SIZE (TREE_TYPE (tmp
)) == 0)
6093 incomplete_type_error (newrhs
, TREE_TYPE (tmp
));
6094 return error_mark_node
;
6100 if (TREE_SIDE_EFFECTS (lhs
))
6101 lhs
= stabilize_reference (lhs
);
6102 if (TREE_SIDE_EFFECTS (newrhs
))
6103 newrhs
= stabilize_reference (newrhs
);
6105 /* Convert new value to destination type. */
6107 if (TREE_CODE (lhstype
) == ARRAY_TYPE
)
6111 if (! comptypes (lhstype
, TREE_TYPE (rhs
), 0))
6113 cp_error ("incompatible types in assignment of `%T' to `%T'",
6114 TREE_TYPE (rhs
), lhstype
);
6115 return error_mark_node
;
6118 /* Allow array assignment in compiler-generated code. */
6119 if (pedantic
&& ! DECL_ARTIFICIAL (current_function_decl
))
6120 pedwarn ("ANSI C++ forbids assignment of arrays");
6122 /* Have to wrap this in RTL_EXPR for two cases:
6123 in base or member initialization and if we
6124 are a branch of a ?: operator. Since we
6125 can't easily know the latter, just do it always. */
6127 result
= make_node (RTL_EXPR
);
6129 TREE_TYPE (result
) = void_type_node
;
6130 do_pending_stack_adjust ();
6131 start_sequence_for_rtl_expr (result
);
6133 /* As a matter of principle, `start_sequence' should do this. */
6136 from_array
= TREE_CODE (TREE_TYPE (newrhs
)) == ARRAY_TYPE
6137 ? 1 + (modifycode
!= INIT_EXPR
): 0;
6138 expand_vec_init (lhs
, lhs
, array_type_nelts (lhstype
), newrhs
,
6141 do_pending_stack_adjust ();
6143 TREE_SIDE_EFFECTS (result
) = 1;
6144 RTL_EXPR_SEQUENCE (result
) = get_insns ();
6145 RTL_EXPR_RTL (result
) = const0_rtx
;
6150 if (modifycode
== INIT_EXPR
)
6152 newrhs
= convert_for_initialization (lhs
, lhstype
, newrhs
, LOOKUP_NORMAL
,
6153 "assignment", NULL_TREE
, 0);
6154 if (lhs
== DECL_RESULT (current_function_decl
))
6156 if (DECL_INITIAL (lhs
))
6157 warning ("return value from function receives multiple initializations");
6158 DECL_INITIAL (lhs
) = newrhs
;
6163 /* Avoid warnings on enum bit fields. */
6164 if (TREE_CODE (olhstype
) == ENUMERAL_TYPE
6165 && TREE_CODE (lhstype
) == INTEGER_TYPE
)
6167 newrhs
= convert_for_assignment (olhstype
, newrhs
, "assignment",
6169 newrhs
= convert_force (lhstype
, newrhs
, 0);
6172 newrhs
= convert_for_assignment (lhstype
, newrhs
, "assignment",
6174 if (TREE_CODE (newrhs
) == CALL_EXPR
6175 && TYPE_NEEDS_CONSTRUCTING (lhstype
))
6176 newrhs
= build_cplus_new (lhstype
, newrhs
);
6178 /* Can't initialize directly from a TARGET_EXPR, since that would
6179 cause the lhs to be constructed twice, and possibly result in
6180 accidental self-initialization. So we force the TARGET_EXPR to be
6181 expanded without a target. */
6182 if (TREE_CODE (newrhs
) == TARGET_EXPR
)
6183 newrhs
= build (COMPOUND_EXPR
, TREE_TYPE (newrhs
), newrhs
,
6184 TREE_OPERAND (newrhs
, 0));
6187 if (newrhs
== error_mark_node
)
6188 return error_mark_node
;
6190 if (TREE_CODE (newrhs
) == COND_EXPR
)
6193 tree cond
= TREE_OPERAND (newrhs
, 0);
6195 if (TREE_SIDE_EFFECTS (lhs
))
6196 cond
= build_compound_expr (tree_cons
6198 build_expr_list (NULL_TREE
, cond
)));
6200 /* Cannot have two identical lhs on this one tree (result) as preexpand
6201 calls will rip them out and fill in RTL for them, but when the
6202 rtl is generated, the calls will only be in the first side of the
6203 condition, not on both, or before the conditional jump! (mrs) */
6204 lhs1
= break_out_calls (lhs
);
6207 /* If there's no change, the COND_EXPR behaves like any other rhs. */
6208 result
= build (modifycode
== NOP_EXPR
? MODIFY_EXPR
: INIT_EXPR
,
6209 lhstype
, lhs
, newrhs
);
6212 tree result_type
= TREE_TYPE (newrhs
);
6213 /* We have to convert each arm to the proper type because the
6214 types may have been munged by constant folding. */
6216 = build (COND_EXPR
, result_type
, cond
,
6217 build_modify_expr (lhs
, modifycode
,
6218 cp_convert (result_type
,
6219 TREE_OPERAND (newrhs
, 1))),
6220 build_modify_expr (lhs1
, modifycode
,
6221 cp_convert (result_type
,
6222 TREE_OPERAND (newrhs
, 2))));
6226 result
= build (modifycode
== NOP_EXPR
? MODIFY_EXPR
: INIT_EXPR
,
6227 lhstype
, lhs
, newrhs
);
6229 TREE_SIDE_EFFECTS (result
) = 1;
6231 /* If we got the LHS in a different type for storing in,
6232 convert the result back to the nominal type of LHS
6233 so that the value we return always has the same type
6234 as the LHS argument. */
6236 if (olhstype
== TREE_TYPE (result
))
6238 /* Avoid warnings converting integral types back into enums
6239 for enum bit fields. */
6240 if (TREE_CODE (TREE_TYPE (result
)) == INTEGER_TYPE
6241 && TREE_CODE (olhstype
) == ENUMERAL_TYPE
)
6243 result
= build (COMPOUND_EXPR
, olhstype
, result
, olhs
);
6244 TREE_NO_UNUSED_WARNING (result
) = 1;
6247 return convert_for_assignment (olhstype
, result
, "assignment",
6252 build_x_modify_expr (lhs
, modifycode
, rhs
)
6254 enum tree_code modifycode
;
6257 if (processing_template_decl
)
6258 return build_min_nt (MODOP_EXPR
, lhs
,
6259 build_min_nt (modifycode
, NULL_TREE
, NULL_TREE
), rhs
);
6261 if (modifycode
!= NOP_EXPR
)
6263 tree rval
= build_opfncall (MODIFY_EXPR
, LOOKUP_NORMAL
, lhs
, rhs
,
6264 make_node (modifycode
));
6268 return build_modify_expr (lhs
, modifycode
, rhs
);
6271 /* Return 0 if EXP is not a valid lvalue in this language
6272 even though `lvalue_or_else' would accept it. */
6275 language_lvalue_valid (exp
)
6276 tree exp ATTRIBUTE_UNUSED
;
6281 /* Get difference in deltas for different pointer to member function
6282 types. Return integer_zero_node, if FROM cannot be converted to a
6283 TO type. If FORCE is true, then allow reverse conversions as well. */
6286 get_delta_difference (from
, to
, force
)
6290 tree delta
= integer_zero_node
;
6296 /* Should get_base_distance here, so we can check if any thing along the
6297 path is virtual, and we need to make sure we stay
6298 inside the real binfos when going through virtual bases.
6299 Maybe we should replace virtual bases with
6300 binfo_member (...CLASSTYPE_VBASECLASSES...)... (mrs) */
6301 binfo
= get_binfo (from
, to
, 1);
6302 if (binfo
== error_mark_node
)
6304 error (" in pointer to member function conversion");
6311 error_not_base_type (from
, to
);
6312 error (" in pointer to member conversion");
6315 binfo
= get_binfo (to
, from
, 1);
6316 if (binfo
== 0 || binfo
== error_mark_node
)
6318 if (TREE_VIA_VIRTUAL (binfo
))
6320 binfo
= binfo_member (BINFO_TYPE (binfo
),
6321 CLASSTYPE_VBASECLASSES (from
));
6322 cp_warning ("pointer to member cast to virtual base `%T'",
6323 BINFO_TYPE (binfo
));
6324 warning (" will only work if you are very careful");
6326 delta
= BINFO_OFFSET (binfo
);
6327 delta
= cp_convert (ptrdiff_type_node
, delta
);
6329 return build_binary_op (MINUS_EXPR
,
6334 if (TREE_VIA_VIRTUAL (binfo
))
6338 cp_warning ("pointer to member cast from virtual base `%T'",
6339 BINFO_TYPE (binfo
));
6340 warning (" will only work if you are very careful");
6343 cp_error ("pointer to member conversion from virtual base `%T'",
6344 BINFO_TYPE (binfo
));
6347 return BINFO_OFFSET (binfo
);
6351 build_ptrmemfunc1 (type
, delta
, idx
, pfn
, delta2
)
6352 tree type
, delta
, idx
, pfn
, delta2
;
6357 /* This is the old way we did it. We want to avoid calling
6358 digest_init, so that it can give an error if we use { } when
6359 initializing a pointer to member function. */
6363 u
= build_nt (CONSTRUCTOR
, NULL_TREE
,
6364 expr_tree_cons (pfn_identifier
, pfn
, NULL_TREE
));
6368 u
= build_nt (CONSTRUCTOR
, NULL_TREE
,
6369 expr_tree_cons (delta2_identifier
, delta2
, NULL_TREE
));
6372 u
= build_nt (CONSTRUCTOR
, NULL_TREE
,
6373 expr_tree_cons (NULL_TREE
, delta
,
6374 expr_tree_cons (NULL_TREE
, idx
,
6375 expr_tree_cons (NULL_TREE
, u
, NULL_TREE
))));
6377 return digest_init (type
, u
, (tree
*)0);
6379 tree delta_field
, idx_field
, pfn_or_delta2_field
, pfn_field
, delta2_field
;
6381 int allconstant
, allsimple
;
6383 delta_field
= TYPE_FIELDS (type
);
6384 idx_field
= TREE_CHAIN (delta_field
);
6385 pfn_or_delta2_field
= TREE_CHAIN (idx_field
);
6386 subtype
= TREE_TYPE (pfn_or_delta2_field
);
6387 pfn_field
= TYPE_FIELDS (subtype
);
6388 delta2_field
= TREE_CHAIN (pfn_field
);
6392 allconstant
= TREE_CONSTANT (pfn
);
6393 allsimple
= !! initializer_constant_valid_p (pfn
, TREE_TYPE (pfn
));
6394 u
= expr_tree_cons (pfn_field
, pfn
, NULL_TREE
);
6398 delta2
= convert_and_check (delta_type_node
, delta2
);
6399 allconstant
= TREE_CONSTANT (delta2
);
6400 allsimple
= !! initializer_constant_valid_p (delta2
, TREE_TYPE (delta2
));
6401 u
= expr_tree_cons (delta2_field
, delta2
, NULL_TREE
);
6404 delta
= convert_and_check (delta_type_node
, delta
);
6405 idx
= convert_and_check (delta_type_node
, idx
);
6407 allconstant
= allconstant
&& TREE_CONSTANT (delta
) && TREE_CONSTANT (idx
);
6408 allsimple
= allsimple
6409 && initializer_constant_valid_p (delta
, TREE_TYPE (delta
))
6410 && initializer_constant_valid_p (idx
, TREE_TYPE (idx
));
6412 u
= build (CONSTRUCTOR
, subtype
, NULL_TREE
, u
);
6413 u
= expr_tree_cons (delta_field
, delta
,
6414 expr_tree_cons (idx_field
, idx
,
6415 expr_tree_cons (pfn_or_delta2_field
, u
, NULL_TREE
)));
6416 u
= build (CONSTRUCTOR
, type
, NULL_TREE
, u
);
6417 TREE_CONSTANT (u
) = allconstant
;
6418 TREE_STATIC (u
) = allconstant
&& allsimple
;
6423 /* Build a constructor for a pointer to member function. It can be
6424 used to initialize global variables, local variable, or used
6425 as a value in expressions. TYPE is the POINTER to METHOD_TYPE we
6428 If FORCE is non-zero, then force this conversion, even if
6429 we would rather not do it. Usually set when using an explicit
6432 Return error_mark_node, if something goes wrong. */
6435 build_ptrmemfunc (type
, pfn
, force
)
6439 tree idx
= integer_zero_node
;
6440 tree delta
= integer_zero_node
;
6441 tree delta2
= integer_zero_node
;
6443 tree npfn
= NULL_TREE
;
6445 /* Handle multiple conversions of pointer to member functions. */
6446 if (TYPE_PTRMEMFUNC_P (TREE_TYPE (pfn
)))
6448 tree ndelta
, ndelta2
;
6452 /* Is is already the right type? */
6453 if (type
== TYPE_PTRMEMFUNC_FN_TYPE (TREE_TYPE (pfn
)))
6456 pfn_type
= TYPE_PTRMEMFUNC_FN_TYPE (TREE_TYPE (pfn
));
6458 && comp_target_types (type
, pfn_type
, 0) != 1)
6459 cp_error ("conversion to `%T' from `%T'", type
, pfn_type
);
6461 ndelta
= cp_convert (ptrdiff_type_node
, build_component_ref (pfn
, delta_identifier
, NULL_TREE
, 0));
6462 ndelta2
= cp_convert (ptrdiff_type_node
, DELTA2_FROM_PTRMEMFUNC (pfn
));
6463 idx
= build_component_ref (pfn
, index_identifier
, NULL_TREE
, 0);
6465 n
= get_delta_difference (TYPE_METHOD_BASETYPE (TREE_TYPE (pfn_type
)),
6466 TYPE_METHOD_BASETYPE (TREE_TYPE (type
)),
6469 delta
= build_binary_op (PLUS_EXPR
, ndelta
, n
, 1);
6470 delta2
= build_binary_op (PLUS_EXPR
, ndelta2
, n
, 1);
6471 e1
= fold (build (GT_EXPR
, boolean_type_node
, idx
, integer_zero_node
));
6473 e2
= build_ptrmemfunc1 (TYPE_GET_PTRMEMFUNC_TYPE (type
), delta
, idx
,
6476 pfn
= PFN_FROM_PTRMEMFUNC (pfn
);
6477 npfn
= build1 (NOP_EXPR
, type
, pfn
);
6478 TREE_CONSTANT (npfn
) = TREE_CONSTANT (pfn
);
6480 e3
= build_ptrmemfunc1 (TYPE_GET_PTRMEMFUNC_TYPE (type
), delta
, idx
, npfn
,
6482 return build_conditional_expr (e1
, e2
, e3
);
6485 /* Handle null pointer to member function conversions. */
6486 if (integer_zerop (pfn
))
6488 pfn
= build_c_cast (type
, integer_zero_node
);
6489 return build_ptrmemfunc1 (TYPE_GET_PTRMEMFUNC_TYPE (type
),
6490 integer_zero_node
, integer_zero_node
,
6494 if (TREE_CODE (pfn
) == TREE_LIST
6495 || (TREE_CODE (pfn
) == ADDR_EXPR
6496 && TREE_CODE (TREE_OPERAND (pfn
, 0)) == TREE_LIST
))
6497 return instantiate_type (type
, pfn
, 1);
6500 && comp_target_types (type
, TREE_TYPE (pfn
), 0) != 1)
6501 cp_error ("conversion to `%T' from `%T'", type
, TREE_TYPE (pfn
));
6503 /* Allow pointer to member conversions here. */
6504 delta
= get_delta_difference (TYPE_METHOD_BASETYPE (TREE_TYPE (TREE_TYPE (pfn
))),
6505 TYPE_METHOD_BASETYPE (TREE_TYPE (type
)),
6507 delta2
= build_binary_op (PLUS_EXPR
, delta2
, delta
, 1);
6509 if (TREE_CODE (TREE_OPERAND (pfn
, 0)) != FUNCTION_DECL
)
6510 warning ("assuming pointer to member function is non-virtual");
6512 if (TREE_CODE (TREE_OPERAND (pfn
, 0)) == FUNCTION_DECL
6513 && DECL_VINDEX (TREE_OPERAND (pfn
, 0)))
6515 /* Find the offset to the vfield pointer in the object. */
6516 vfield_offset
= get_binfo (DECL_CONTEXT (TREE_OPERAND (pfn
, 0)),
6517 DECL_CLASS_CONTEXT (TREE_OPERAND (pfn
, 0)),
6519 vfield_offset
= get_vfield_offset (vfield_offset
);
6520 delta2
= size_binop (PLUS_EXPR
, vfield_offset
, delta2
);
6522 /* Map everything down one to make room for the null pointer to member. */
6523 idx
= size_binop (PLUS_EXPR
,
6524 DECL_VINDEX (TREE_OPERAND (pfn
, 0)),
6529 idx
= size_binop (MINUS_EXPR
, integer_zero_node
, integer_one_node
);
6531 if (type
== TREE_TYPE (pfn
))
6537 npfn
= build1 (NOP_EXPR
, type
, pfn
);
6538 TREE_CONSTANT (npfn
) = TREE_CONSTANT (pfn
);
6542 return build_ptrmemfunc1 (TYPE_GET_PTRMEMFUNC_TYPE (type
), delta
, idx
, npfn
, delta2
);
6545 /* Convert value RHS to type TYPE as preparation for an assignment
6546 to an lvalue of type TYPE.
6547 The real work of conversion is done by `convert'.
6548 The purpose of this function is to generate error messages
6549 for assignments that are not allowed in C.
6550 ERRTYPE is a string to use in error messages:
6551 "assignment", "return", etc.
6553 C++: attempts to allow `convert' to find conversions involving
6554 implicit type conversion between aggregate and scalar types
6555 as per 8.5.6 of C++ manual. Does not randomly dereference
6556 pointers to aggregates! */
6559 convert_for_assignment (type
, rhs
, errtype
, fndecl
, parmnum
)
6565 register enum tree_code codel
= TREE_CODE (type
);
6566 register tree rhstype
;
6567 register enum tree_code coder
= TREE_CODE (TREE_TYPE (rhs
));
6569 if (coder
== UNKNOWN_TYPE
)
6570 rhs
= instantiate_type (type
, rhs
, 1);
6572 if (coder
== ERROR_MARK
)
6573 return error_mark_node
;
6575 if (codel
== OFFSET_TYPE
)
6577 type
= TREE_TYPE (type
);
6578 codel
= TREE_CODE (type
);
6581 /* Strip NON_LVALUE_EXPRs since we aren't using as an lvalue. */
6582 if (TREE_CODE (rhs
) == NON_LVALUE_EXPR
)
6583 rhs
= TREE_OPERAND (rhs
, 0);
6585 if (rhs
== error_mark_node
)
6586 return error_mark_node
;
6588 if (TREE_CODE (rhs
) == TREE_LIST
&& TREE_VALUE (rhs
) == error_mark_node
)
6589 return error_mark_node
;
6591 if (TREE_CODE (TREE_TYPE (rhs
)) == OFFSET_TYPE
)
6593 rhs
= resolve_offset_ref (rhs
);
6594 if (rhs
== error_mark_node
)
6595 return error_mark_node
;
6596 rhstype
= TREE_TYPE (rhs
);
6597 coder
= TREE_CODE (rhstype
);
6600 if (TREE_CODE (TREE_TYPE (rhs
)) == ARRAY_TYPE
6601 || TREE_CODE (TREE_TYPE (rhs
)) == FUNCTION_TYPE
6602 || TREE_CODE (TREE_TYPE (rhs
)) == METHOD_TYPE
)
6603 rhs
= default_conversion (rhs
);
6604 else if (TREE_CODE (TREE_TYPE (rhs
)) == REFERENCE_TYPE
)
6605 rhs
= convert_from_reference (rhs
);
6607 rhstype
= TREE_TYPE (rhs
);
6608 coder
= TREE_CODE (rhstype
);
6610 /* This should no longer change types on us. */
6611 if (TREE_CODE (rhs
) == CONST_DECL
)
6612 rhs
= DECL_INITIAL (rhs
);
6613 else if (TREE_READONLY_DECL_P (rhs
))
6614 rhs
= decl_constant_value (rhs
);
6616 if (type
== rhstype
)
6618 overflow_warning (rhs
);
6622 if (coder
== VOID_TYPE
)
6624 error ("void value not ignored as it ought to be");
6625 return error_mark_node
;
6627 /* Arithmetic types all interconvert. */
6628 if ((codel
== INTEGER_TYPE
|| codel
== REAL_TYPE
|| codel
== BOOLEAN_TYPE
6629 || codel
== COMPLEX_TYPE
)
6630 && (coder
== INTEGER_TYPE
|| coder
== REAL_TYPE
|| coder
== BOOLEAN_TYPE
6631 || coder
== COMPLEX_TYPE
))
6633 /* But we should warn if assigning REAL_TYPE to INTEGER_TYPE. */
6634 if (coder
== REAL_TYPE
&& codel
== INTEGER_TYPE
)
6637 cp_warning ("`%T' used for argument %P of `%D'",
6638 rhstype
, parmnum
, fndecl
);
6640 cp_warning ("%s to `%T' from `%T'", errtype
, type
, rhstype
);
6642 /* And we should warn if assigning a negative value to
6643 an unsigned variable. */
6644 else if (TREE_UNSIGNED (type
) && codel
!= BOOLEAN_TYPE
)
6646 if (TREE_CODE (rhs
) == INTEGER_CST
6647 && TREE_NEGATED_INT (rhs
))
6650 cp_warning ("negative value `%E' passed as argument %P of `%D'",
6651 rhs
, parmnum
, fndecl
);
6653 cp_warning ("%s of negative value `%E' to `%T'",
6654 errtype
, rhs
, type
);
6656 overflow_warning (rhs
);
6657 if (TREE_CONSTANT (rhs
))
6661 return convert_and_check (type
, rhs
);
6663 /* Conversions involving enums. */
6664 else if ((codel
== ENUMERAL_TYPE
6665 && (INTEGRAL_CODE_P (coder
) || coder
== REAL_TYPE
))
6666 || (coder
== ENUMERAL_TYPE
6667 && (INTEGRAL_CODE_P (codel
) || codel
== REAL_TYPE
)))
6669 return ocp_convert (type
, rhs
, CONV_IMPLICIT
, LOOKUP_NORMAL
);
6671 /* Conversions among pointers */
6672 else if (codel
== POINTER_TYPE
6673 && (coder
== POINTER_TYPE
6674 || (coder
== RECORD_TYPE
6675 && (IS_SIGNATURE_POINTER (rhstype
)
6676 || IS_SIGNATURE_REFERENCE (rhstype
)))))
6678 register tree ttl
= TREE_TYPE (type
);
6682 if (coder
== RECORD_TYPE
)
6684 rhs
= build_optr_ref (rhs
);
6685 rhstype
= TREE_TYPE (rhs
);
6687 ttr
= TREE_TYPE (rhstype
);
6689 /* If both pointers are of aggregate type, then we
6690 can give better error messages, and save some work
6692 if (TREE_CODE (ttl
) == RECORD_TYPE
&& TREE_CODE (ttr
) == RECORD_TYPE
)
6696 if (TYPE_MAIN_VARIANT (ttl
) == TYPE_MAIN_VARIANT (ttr
)
6697 || type
== class_star_type_node
6698 || rhstype
== class_star_type_node
)
6699 binfo
= TYPE_BINFO (ttl
);
6701 binfo
= get_binfo (ttl
, ttr
, 1);
6703 if (binfo
== error_mark_node
)
6704 return error_mark_node
;
6706 return error_not_base_type (ttl
, ttr
);
6708 if (! TYPE_READONLY (ttl
) && TYPE_READONLY (ttr
))
6711 cp_pedwarn ("passing `%T' as argument %P of `%D' discards const",
6712 rhstype
, parmnum
, fndecl
);
6714 cp_pedwarn ("%s to `%T' from `%T' discards const",
6715 errtype
, type
, rhstype
);
6717 if (! TYPE_VOLATILE (ttl
) && TYPE_VOLATILE (ttr
))
6720 cp_pedwarn ("passing `%T' as argument %P of `%D' discards volatile",
6721 rhstype
, parmnum
, fndecl
);
6723 cp_pedwarn ("%s to `%T' from `%T' discards volatile",
6724 errtype
, type
, rhstype
);
6728 /* Any non-function converts to a [const][volatile] void *
6729 and vice versa; otherwise, targets must be the same.
6730 Meanwhile, the lhs target must have all the qualifiers of the rhs. */
6731 else if (TYPE_MAIN_VARIANT (ttl
) == void_type_node
6732 || TYPE_MAIN_VARIANT (ttr
) == void_type_node
6733 || (ctt
= comp_target_types (type
, rhstype
, 1))
6734 || (unsigned_type (TYPE_MAIN_VARIANT (ttl
))
6735 == unsigned_type (TYPE_MAIN_VARIANT (ttr
))))
6737 /* ARM $4.8, commentary on p39. */
6738 if (TYPE_MAIN_VARIANT (ttl
) == void_type_node
6739 && TREE_CODE (ttr
) == OFFSET_TYPE
)
6741 cp_error ("no standard conversion from `%T' to `void *'", ttr
);
6742 return error_mark_node
;
6745 if (ctt
< 0 && TYPE_MAIN_VARIANT (ttl
) != TYPE_MAIN_VARIANT (ttr
))
6746 cp_pedwarn ("converting `%T' to `%T' is a contravariance violation",
6749 if (TYPE_MAIN_VARIANT (ttl
) != void_type_node
6750 && TYPE_MAIN_VARIANT (ttr
) == void_type_node
6751 && ! null_ptr_cst_p (rhs
))
6753 if (coder
== RECORD_TYPE
)
6754 cp_pedwarn ("implicit conversion of signature pointer to type `%T'",
6757 pedwarn ("ANSI C++ forbids implicit conversion from `void *' in %s",
6760 /* Const and volatile mean something different for function types,
6761 so the usual warnings are not appropriate. */
6762 else if ((TREE_CODE (ttr
) != FUNCTION_TYPE
&& TREE_CODE (ttr
) != METHOD_TYPE
)
6763 || (TREE_CODE (ttl
) != FUNCTION_TYPE
&& TREE_CODE (ttl
) != METHOD_TYPE
))
6765 if (TREE_CODE (ttl
) == OFFSET_TYPE
6766 && binfo_member (TYPE_OFFSET_BASETYPE (ttr
),
6767 CLASSTYPE_VBASECLASSES (TYPE_OFFSET_BASETYPE (ttl
))))
6769 sorry ("%s between pointer to members converting across virtual baseclasses", errtype
);
6770 return error_mark_node
;
6772 else if (! TYPE_READONLY (ttl
) && TYPE_READONLY (ttr
))
6775 cp_pedwarn ("passing `%T' as argument %P of `%D' discards const",
6776 rhstype
, parmnum
, fndecl
);
6778 cp_pedwarn ("%s to `%T' from `%T' discards const",
6779 errtype
, type
, rhstype
);
6781 else if (! TYPE_VOLATILE (ttl
) && TYPE_VOLATILE (ttr
))
6784 cp_pedwarn ("passing `%T' as argument %P of `%D' discards volatile",
6785 rhstype
, parmnum
, fndecl
);
6787 cp_pedwarn ("%s to `%T' from `%T' discards volatile",
6788 errtype
, type
, rhstype
);
6790 else if (TREE_CODE (ttl
) == TREE_CODE (ttr
)
6791 && ! comp_target_types (type
, rhstype
, 1))
6794 cp_pedwarn ("passing `%T' as argument %P of `%D' changes signedness",
6795 rhstype
, parmnum
, fndecl
);
6797 cp_pedwarn ("%s to `%T' from `%T' changes signedness",
6798 errtype
, type
, rhstype
);
6804 int add_quals
= 0, const_parity
= 0, volatile_parity
= 0;
6806 int unsigned_parity
;
6809 /* This code is basically a duplicate of comp_ptr_ttypes_real. */
6810 for (; ; ttl
= TREE_TYPE (ttl
), ttr
= TREE_TYPE (ttr
))
6813 const_parity
|= (TYPE_READONLY (ttl
) < TYPE_READONLY (ttr
));
6814 volatile_parity
|= (TYPE_VOLATILE (ttl
) < TYPE_VOLATILE (ttr
));
6817 && (TYPE_READONLY (ttl
) > TYPE_READONLY (ttr
)
6818 || TYPE_VOLATILE (ttl
) > TYPE_VOLATILE (ttr
)))
6820 left_const
&= TYPE_READONLY (ttl
);
6822 if (TREE_CODE (ttl
) != POINTER_TYPE
6823 || TREE_CODE (ttr
) != POINTER_TYPE
)
6826 unsigned_parity
= TREE_UNSIGNED (ttl
) - TREE_UNSIGNED (ttr
);
6827 if (unsigned_parity
)
6829 if (TREE_UNSIGNED (ttl
))
6830 ttr
= unsigned_type (ttr
);
6832 ttl
= unsigned_type (ttl
);
6835 if (comp_target_types (ttl
, ttr
, nptrs
) > 0)
6840 cp_pedwarn ("passing `%T' as argument %P of `%D' adds cv-quals without intervening `const'",
6841 rhstype
, parmnum
, fndecl
);
6843 cp_pedwarn ("%s to `%T' from `%T' adds cv-quals without intervening `const'",
6844 errtype
, type
, rhstype
);
6849 cp_pedwarn ("passing `%T' as argument %P of `%D' discards const",
6850 rhstype
, parmnum
, fndecl
);
6852 cp_pedwarn ("%s to `%T' from `%T' discards const",
6853 errtype
, type
, rhstype
);
6855 if (volatile_parity
)
6858 cp_pedwarn ("passing `%T' as argument %P of `%D' discards volatile",
6859 rhstype
, parmnum
, fndecl
);
6861 cp_pedwarn ("%s to `%T' from `%T' discards volatile",
6862 errtype
, type
, rhstype
);
6864 if (unsigned_parity
> 0)
6867 cp_pedwarn ("passing `%T' as argument %P of `%D' changes signed to unsigned",
6868 rhstype
, parmnum
, fndecl
);
6870 cp_pedwarn ("%s to `%T' from `%T' changes signed to unsigned",
6871 errtype
, type
, rhstype
);
6873 else if (unsigned_parity
< 0)
6876 cp_pedwarn ("passing `%T' as argument %P of `%D' changes unsigned to signed",
6877 rhstype
, parmnum
, fndecl
);
6879 cp_pedwarn ("%s to `%T' from `%T' changes unsigned to signed",
6880 errtype
, type
, rhstype
);
6883 /* C++ is not so friendly about converting function and
6884 member function pointers as C. Emit warnings here. */
6885 if (TREE_CODE (ttl
) == FUNCTION_TYPE
6886 || TREE_CODE (ttl
) == METHOD_TYPE
)
6887 if (! comptypes (ttl
, ttr
, 0))
6889 warning ("conflicting function types in %s:", errtype
);
6890 cp_warning ("\t`%T' != `%T'", type
, rhstype
);
6896 cp_error ("passing `%T' as argument %P of `%D'",
6897 rhstype
, parmnum
, fndecl
);
6899 cp_error ("%s to `%T' from `%T'", errtype
, type
, rhstype
);
6900 return error_mark_node
;
6903 return cp_convert (type
, rhs
);
6905 else if (codel
== POINTER_TYPE
&& coder
== INTEGER_TYPE
)
6907 /* An explicit constant 0 can convert to a pointer,
6908 but not a 0 that results from casting or folding. */
6909 if (! (TREE_CODE (rhs
) == INTEGER_CST
&& integer_zerop (rhs
)))
6912 cp_pedwarn ("passing `%T' to argument %P of `%D' lacks a cast",
6913 rhstype
, parmnum
, fndecl
);
6915 cp_pedwarn ("%s to `%T' from `%T' lacks a cast",
6916 errtype
, type
, rhstype
);
6918 return cp_convert (type
, rhs
);
6920 else if (codel
== INTEGER_TYPE
6921 && (coder
== POINTER_TYPE
6922 || (coder
== RECORD_TYPE
6923 && (IS_SIGNATURE_POINTER (rhstype
)
6924 || TYPE_PTRMEMFUNC_FLAG (rhstype
)
6925 || IS_SIGNATURE_REFERENCE (rhstype
)))))
6928 cp_pedwarn ("passing `%T' to argument %P of `%D' lacks a cast",
6929 rhstype
, parmnum
, fndecl
);
6931 cp_pedwarn ("%s to `%T' from `%T' lacks a cast",
6932 errtype
, type
, rhstype
);
6933 return cp_convert (type
, rhs
);
6935 else if (codel
== BOOLEAN_TYPE
6936 && (coder
== POINTER_TYPE
6937 || (coder
== RECORD_TYPE
6938 && (IS_SIGNATURE_POINTER (rhstype
)
6939 || TYPE_PTRMEMFUNC_FLAG (rhstype
)
6940 || IS_SIGNATURE_REFERENCE (rhstype
)))))
6941 return cp_convert (type
, rhs
);
6944 else if (((coder
== POINTER_TYPE
6945 && TREE_CODE (TREE_TYPE (rhstype
)) == METHOD_TYPE
)
6946 || integer_zerop (rhs
)
6947 || TYPE_PTRMEMFUNC_P (rhstype
))
6948 && TYPE_PTRMEMFUNC_P (type
))
6950 tree ttl
= TYPE_PTRMEMFUNC_FN_TYPE (type
);
6951 tree ttr
= (TYPE_PTRMEMFUNC_P (rhstype
)
6952 ? TYPE_PTRMEMFUNC_FN_TYPE (rhstype
)
6954 int ctt
= (TREE_CODE (rhstype
) == INTEGER_TYPE
? 1
6955 : comp_target_types (ttl
, ttr
, 1));
6958 cp_pedwarn ("converting `%T' to `%T' is a contravariance violation",
6961 cp_error ("%s to `%T' from `%T'", errtype
, ttl
, ttr
);
6963 /* compatible pointer to member functions. */
6964 return build_ptrmemfunc (ttl
, rhs
, 0);
6966 else if (codel
== ERROR_MARK
|| coder
== ERROR_MARK
)
6967 return error_mark_node
;
6969 /* This should no longer happen. References are initialized via
6970 `convert_for_initialization'. They should otherwise be
6971 bashed before coming here. */
6972 else if (codel
== REFERENCE_TYPE
)
6973 my_friendly_abort (317);
6974 else if (TYPE_MAIN_VARIANT (type
) == TYPE_MAIN_VARIANT (TREE_TYPE (rhs
)))
6976 tree nrhs
= build1 (NOP_EXPR
, type
, rhs
);
6977 TREE_CONSTANT (nrhs
) = TREE_CONSTANT (rhs
);
6980 else if (TYPE_HAS_CONSTRUCTOR (type
) || IS_AGGR_TYPE (TREE_TYPE (rhs
)))
6981 return cp_convert (type
, rhs
);
6982 /* Handle anachronistic conversions from (::*)() to cv void* or (*)(). */
6983 else if (TREE_CODE (type
) == POINTER_TYPE
6984 && (TREE_CODE (TREE_TYPE (type
)) == FUNCTION_TYPE
6985 || TYPE_MAIN_VARIANT (TREE_TYPE (type
)) == void_type_node
)
6987 && TYPE_PTRMEMFUNC_P (TREE_TYPE (rhs
)))
6988 return cp_convert (type
, rhs
);
6990 cp_error ("%s to `%T' from `%T'", errtype
, type
, rhstype
);
6991 return error_mark_node
;
6994 /* Convert RHS to be of type TYPE. If EXP is non-zero,
6995 it is the target of the initialization.
6996 ERRTYPE is a string to use in error messages.
6998 Two major differences between the behavior of
6999 `convert_for_assignment' and `convert_for_initialization'
7000 are that references are bashed in the former, while
7001 copied in the latter, and aggregates are assigned in
7002 the former (operator=) while initialized in the
7005 If using constructor make sure no conversion operator exists, if one does
7006 exist, an ambiguity exists.
7008 If flags doesn't include LOOKUP_COMPLAIN, don't complain about anything. */
7011 convert_for_initialization (exp
, type
, rhs
, flags
, errtype
, fndecl
, parmnum
)
7012 tree exp
, type
, rhs
;
7018 register enum tree_code codel
= TREE_CODE (type
);
7019 register tree rhstype
;
7020 register enum tree_code coder
;
7022 /* build_c_cast puts on a NOP_EXPR to make the result not an lvalue.
7023 Strip such NOP_EXPRs, since RHS is used in non-lvalue context. */
7024 if (TREE_CODE (rhs
) == NOP_EXPR
7025 && TREE_TYPE (rhs
) == TREE_TYPE (TREE_OPERAND (rhs
, 0))
7026 && codel
!= REFERENCE_TYPE
)
7027 rhs
= TREE_OPERAND (rhs
, 0);
7029 if (rhs
== error_mark_node
7030 || (TREE_CODE (rhs
) == TREE_LIST
&& TREE_VALUE (rhs
) == error_mark_node
))
7031 return error_mark_node
;
7033 if (TREE_CODE (TREE_TYPE (rhs
)) == OFFSET_TYPE
)
7035 rhs
= resolve_offset_ref (rhs
);
7036 if (rhs
== error_mark_node
)
7037 return error_mark_node
;
7040 if (TREE_CODE (TREE_TYPE (rhs
)) == REFERENCE_TYPE
)
7041 rhs
= convert_from_reference (rhs
);
7043 if ((TREE_CODE (TREE_TYPE (rhs
)) == ARRAY_TYPE
7044 && TREE_CODE (type
) != ARRAY_TYPE
7045 && (TREE_CODE (type
) != REFERENCE_TYPE
7046 || TREE_CODE (TREE_TYPE (type
)) != ARRAY_TYPE
))
7047 || TREE_CODE (TREE_TYPE (rhs
)) == FUNCTION_TYPE
7048 || TREE_CODE (TREE_TYPE (rhs
)) == METHOD_TYPE
)
7049 rhs
= default_conversion (rhs
);
7051 rhstype
= TREE_TYPE (rhs
);
7052 coder
= TREE_CODE (rhstype
);
7054 if (coder
== UNKNOWN_TYPE
)
7056 rhs
= instantiate_type (type
, rhs
, 1);
7057 rhstype
= TREE_TYPE (rhs
);
7058 coder
= TREE_CODE (rhstype
);
7061 if (coder
== ERROR_MARK
)
7062 return error_mark_node
;
7064 /* We accept references to incomplete types, so we can
7065 return here before checking if RHS is of complete type. */
7067 if (codel
== REFERENCE_TYPE
)
7069 /* This should eventually happen in convert_arguments. */
7070 extern int warningcount
, errorcount
;
7071 int savew
= 0, savee
= 0;
7074 savew
= warningcount
, savee
= errorcount
;
7075 rhs
= convert_to_reference (type
, rhs
, CONV_IMPLICIT
, flags
,
7076 exp
? exp
: error_mark_node
);
7079 if (warningcount
> savew
)
7080 cp_warning_at ("in passing argument %P of `%+D'", parmnum
, fndecl
);
7081 else if (errorcount
> savee
)
7082 cp_error_at ("in passing argument %P of `%+D'", parmnum
, fndecl
);
7087 rhs
= require_complete_type (rhs
);
7088 if (rhs
== error_mark_node
)
7089 return error_mark_node
;
7091 if (exp
!= 0) exp
= require_complete_type (exp
);
7092 if (exp
== error_mark_node
)
7093 return error_mark_node
;
7095 if (TREE_CODE (rhstype
) == REFERENCE_TYPE
)
7096 rhstype
= TREE_TYPE (rhstype
);
7098 type
= complete_type (type
);
7100 if (TYPE_LANG_SPECIFIC (type
)
7101 && (IS_SIGNATURE_POINTER (type
) || IS_SIGNATURE_REFERENCE (type
)))
7102 return build_signature_pointer_constructor (type
, rhs
);
7104 if (IS_AGGR_TYPE (type
))
7105 return ocp_convert (type
, rhs
, CONV_IMPLICIT
|CONV_FORCE_TEMP
, flags
);
7107 if (type
== TREE_TYPE (rhs
))
7109 if (TREE_READONLY_DECL_P (rhs
))
7110 rhs
= decl_constant_value (rhs
);
7114 return convert_for_assignment (type
, rhs
, errtype
, fndecl
, parmnum
);
7117 /* Expand an ASM statement with operands, handling output operands
7118 that are not variables or INDIRECT_REFS by transforming such
7119 cases into cases that expand_asm_operands can handle.
7121 Arguments are same as for expand_asm_operands.
7123 We don't do default conversions on all inputs, because it can screw
7124 up operands that are expected to be in memory. */
7127 c_expand_asm_operands (string
, outputs
, inputs
, clobbers
, vol
, filename
, line
)
7128 tree string
, outputs
, inputs
, clobbers
;
7133 int noutputs
= list_length (outputs
);
7135 /* o[I] is the place that output number I should be written. */
7136 register tree
*o
= (tree
*) alloca (noutputs
* sizeof (tree
));
7139 /* Record the contents of OUTPUTS before it is modified. */
7140 for (i
= 0, tail
= outputs
; tail
; tail
= TREE_CHAIN (tail
), i
++)
7141 o
[i
] = TREE_VALUE (tail
);
7143 /* Generate the ASM_OPERANDS insn;
7144 store into the TREE_VALUEs of OUTPUTS some trees for
7145 where the values were actually stored. */
7146 expand_asm_operands (string
, outputs
, inputs
, clobbers
, vol
, filename
, line
);
7148 /* Copy all the intermediate outputs into the specified outputs. */
7149 for (i
= 0, tail
= outputs
; tail
; tail
= TREE_CHAIN (tail
), i
++)
7151 if (o
[i
] != TREE_VALUE (tail
))
7153 expand_expr (build_modify_expr (o
[i
], NOP_EXPR
, TREE_VALUE (tail
)),
7154 const0_rtx
, VOIDmode
, EXPAND_NORMAL
);
7157 /* Detect modification of read-only values.
7158 (Otherwise done by build_modify_expr.) */
7161 tree type
= TREE_TYPE (o
[i
]);
7162 if (TYPE_READONLY (type
)
7163 || ((TREE_CODE (type
) == RECORD_TYPE
7164 || TREE_CODE (type
) == UNION_TYPE
)
7165 && C_TYPE_FIELDS_READONLY (type
)))
7166 readonly_error (o
[i
], "modification by `asm'", 1);
7170 /* Those MODIFY_EXPRs could do autoincrements. */
7174 /* Expand a C `return' statement.
7175 RETVAL is the expression for what to return,
7176 or a null pointer for `return;' with no value.
7178 C++: upon seeing a `return', we must call destructors on all
7179 variables in scope which had constructors called on them.
7180 This means that if in a destructor, the base class destructors
7181 must be called before returning.
7183 The RETURN statement in C++ has initialization semantics. */
7186 c_expand_return (retval
)
7189 extern struct nesting
*cond_stack
, *loop_stack
, *case_stack
;
7190 extern tree dtor_label
, ctor_label
;
7191 tree result
= DECL_RESULT (current_function_decl
);
7192 tree valtype
= TREE_TYPE (result
);
7194 if (TREE_THIS_VOLATILE (current_function_decl
))
7195 warning ("function declared `noreturn' has a `return' statement");
7197 if (retval
== error_mark_node
)
7199 current_function_returns_null
= 1;
7203 if (processing_template_decl
)
7205 add_tree (build_min_nt (RETURN_STMT
, retval
));
7209 if (retval
== NULL_TREE
)
7211 /* A non-named return value does not count. */
7213 /* Can't just return from a destructor. */
7216 expand_goto (dtor_label
);
7220 if (DECL_CONSTRUCTOR_P (current_function_decl
))
7221 retval
= current_class_ptr
;
7222 else if (DECL_NAME (result
) != NULL_TREE
7223 && TREE_CODE (valtype
) != VOID_TYPE
)
7227 current_function_returns_null
= 1;
7229 if (valtype
!= NULL_TREE
&& TREE_CODE (valtype
) != VOID_TYPE
)
7231 if (DECL_NAME (DECL_RESULT (current_function_decl
)) == NULL_TREE
)
7233 pedwarn ("`return' with no value, in function returning non-void");
7234 /* Clear this, so finish_function won't say that we
7235 reach the end of a non-void function (which we don't,
7236 we gave a return!). */
7237 current_function_returns_null
= 0;
7241 expand_null_return ();
7245 else if (DECL_CONSTRUCTOR_P (current_function_decl
)
7246 && retval
!= current_class_ptr
)
7248 if (flag_this_is_variable
)
7249 error ("return from a constructor: use `this = ...' instead");
7251 error ("return from a constructor");
7252 retval
= current_class_ptr
;
7255 /* Effective C++ rule 15. See also start_function. */
7257 && DECL_NAME (current_function_decl
) == ansi_opname
[(int) MODIFY_EXPR
]
7258 && retval
!= current_class_ref
)
7259 cp_warning ("`operator=' should return a reference to `*this'");
7261 if (valtype
== NULL_TREE
|| TREE_CODE (valtype
) == VOID_TYPE
)
7263 current_function_returns_null
= 1;
7264 if (TREE_CODE (TREE_TYPE (retval
)) != VOID_TYPE
)
7265 pedwarn ("`return' with a value, in function returning void");
7266 expand_return (retval
);
7270 /* Now deal with possible C++ hair:
7271 (1) Compute the return value.
7272 (2) If there are aggregate values with destructors which
7273 must be cleaned up, clean them (taking care
7274 not to clobber the return value).
7275 (3) If an X(X&) constructor is defined, the return
7276 value must be returned via that. */
7278 if (retval
== result
7279 || DECL_CONSTRUCTOR_P (current_function_decl
))
7280 /* It's already done for us. */;
7281 else if (TREE_TYPE (retval
) == void_type_node
)
7283 pedwarn ("return of void value in function returning non-void");
7284 expand_expr_stmt (retval
);
7289 retval
= convert_for_initialization
7290 (NULL_TREE
, valtype
, retval
, LOOKUP_NORMAL
|LOOKUP_ONLYCONVERTING
,
7291 "return", NULL_TREE
, 0);
7293 if (retval
== error_mark_node
)
7295 /* Avoid warning about control reaching end of function. */
7296 expand_null_return ();
7300 /* We can't initialize a register from a AGGR_INIT_EXPR. */
7301 else if (! current_function_returns_struct
7302 && TREE_CODE (retval
) == TARGET_EXPR
7303 && TREE_CODE (TREE_OPERAND (retval
, 1)) == AGGR_INIT_EXPR
)
7304 retval
= build (COMPOUND_EXPR
, TREE_TYPE (retval
), retval
,
7305 TREE_OPERAND (retval
, 0));
7307 /* Add some useful error checking for C++. */
7308 else if (TREE_CODE (valtype
) == REFERENCE_TYPE
)
7310 tree whats_returned
;
7312 /* Sort through common things to see what it is
7313 we are returning. */
7314 whats_returned
= retval
;
7315 if (TREE_CODE (whats_returned
) == COMPOUND_EXPR
)
7317 whats_returned
= TREE_OPERAND (whats_returned
, 1);
7318 if (TREE_CODE (whats_returned
) == ADDR_EXPR
)
7319 whats_returned
= TREE_OPERAND (whats_returned
, 0);
7321 while (TREE_CODE (whats_returned
) == CONVERT_EXPR
7322 || TREE_CODE (whats_returned
) == NOP_EXPR
)
7323 whats_returned
= TREE_OPERAND (whats_returned
, 0);
7324 if (TREE_CODE (whats_returned
) == ADDR_EXPR
)
7326 whats_returned
= TREE_OPERAND (whats_returned
, 0);
7327 while (TREE_CODE (whats_returned
) == AGGR_INIT_EXPR
7328 || TREE_CODE (whats_returned
) == TARGET_EXPR
)
7330 /* Get the target. */
7331 whats_returned
= TREE_OPERAND (whats_returned
, 0);
7332 warning ("returning reference to temporary");
7336 if (TREE_CODE (whats_returned
) == VAR_DECL
&& DECL_NAME (whats_returned
))
7338 if (TEMP_NAME_P (DECL_NAME (whats_returned
)))
7339 warning ("reference to non-lvalue returned");
7340 else if (TREE_CODE (TREE_TYPE (whats_returned
)) != REFERENCE_TYPE
7341 && ! TREE_STATIC (whats_returned
)
7342 && IDENTIFIER_LOCAL_VALUE (DECL_NAME (whats_returned
))
7343 && !TREE_PUBLIC (whats_returned
))
7344 cp_warning_at ("reference to local variable `%D' returned", whats_returned
);
7347 else if (TREE_CODE (retval
) == ADDR_EXPR
)
7349 tree whats_returned
= TREE_OPERAND (retval
, 0);
7351 if (TREE_CODE (whats_returned
) == VAR_DECL
7352 && DECL_NAME (whats_returned
)
7353 && IDENTIFIER_LOCAL_VALUE (DECL_NAME (whats_returned
))
7354 && !TREE_STATIC (whats_returned
)
7355 && !TREE_PUBLIC (whats_returned
))
7356 cp_warning_at ("address of local variable `%D' returned", whats_returned
);
7360 if (retval
!= NULL_TREE
7361 && TREE_CODE_CLASS (TREE_CODE (retval
)) == 'd'
7362 && cond_stack
== 0 && loop_stack
== 0 && case_stack
== 0)
7363 current_function_return_value
= retval
;
7365 if (ctor_label
&& TREE_CODE (ctor_label
) != ERROR_MARK
)
7367 /* Here RETVAL is CURRENT_CLASS_PTR, so there's nothing to do. */
7368 expand_goto (ctor_label
);
7371 if (retval
&& retval
!= result
)
7373 result
= build (INIT_EXPR
, TREE_TYPE (result
), result
, retval
);
7374 TREE_SIDE_EFFECTS (result
) = 1;
7377 expand_start_target_temps ();
7379 expand_return (result
);
7381 expand_end_target_temps ();
7383 current_function_returns_value
= 1;
7386 /* Start a C switch statement, testing expression EXP.
7387 Return EXP if it is valid, an error node otherwise. */
7390 c_expand_start_case (exp
)
7394 register enum tree_code code
;
7396 /* Convert from references, etc. */
7397 exp
= default_conversion (exp
);
7398 type
= TREE_TYPE (exp
);
7399 code
= TREE_CODE (type
);
7401 if (IS_AGGR_TYPE_CODE (code
))
7402 exp
= build_type_conversion (CONVERT_EXPR
, integer_type_node
, exp
, 1);
7404 if (exp
== NULL_TREE
)
7406 error ("switch quantity not an integer");
7407 exp
= error_mark_node
;
7409 type
= TREE_TYPE (exp
);
7410 code
= TREE_CODE (type
);
7412 if (code
!= INTEGER_TYPE
&& code
!= ENUMERAL_TYPE
&& code
!= ERROR_MARK
)
7414 error ("switch quantity not an integer");
7415 exp
= error_mark_node
;
7421 exp
= default_conversion (exp
);
7422 type
= TREE_TYPE (exp
);
7423 idx
= get_unwidened (exp
, 0);
7424 /* We can't strip a conversion from a signed type to an unsigned,
7425 because if we did, int_fits_type_p would do the wrong thing
7426 when checking case values for being in range,
7427 and it's too hard to do the right thing. */
7428 if (TREE_UNSIGNED (TREE_TYPE (exp
))
7429 == TREE_UNSIGNED (TREE_TYPE (idx
)))
7434 (1, fold (build1 (CLEANUP_POINT_EXPR
, TREE_TYPE (exp
), exp
)),
7435 type
, "switch statement");
7440 /* Returns non-zero if the pointer-type FROM can be converted to the
7441 pointer-type TO via a qualification conversion. If CONSTP is -1,
7442 then we return non-zero if the pointers are similar, and the
7443 cv-qualification signature of FROM is a proper subset of that of TO.
7445 If CONSTP is positive, then all outer pointers have been
7449 comp_ptr_ttypes_real (to
, from
, constp
)
7453 int to_more_cv_qualified
= 0;
7455 for (; ; to
= TREE_TYPE (to
), from
= TREE_TYPE (from
))
7457 if (TREE_CODE (to
) != TREE_CODE (from
))
7460 if (TREE_CODE (from
) == OFFSET_TYPE
7461 && comptypes (TYPE_OFFSET_BASETYPE (from
),
7462 TYPE_OFFSET_BASETYPE (to
), 1))
7465 /* Const and volatile mean something different for function types,
7466 so the usual checks are not appropriate. */
7467 if (TREE_CODE (to
) != FUNCTION_TYPE
&& TREE_CODE (to
) != METHOD_TYPE
)
7469 if (TYPE_READONLY (from
) > TYPE_READONLY (to
)
7470 || TYPE_VOLATILE (from
) > TYPE_VOLATILE (to
))
7473 if (TYPE_READONLY (to
) > TYPE_READONLY (from
)
7474 || TYPE_VOLATILE (to
) > TYPE_VOLATILE (from
))
7479 ++to_more_cv_qualified
;
7483 constp
&= TYPE_READONLY (to
);
7486 if (TREE_CODE (to
) != POINTER_TYPE
)
7488 comptypes (TYPE_MAIN_VARIANT (to
), TYPE_MAIN_VARIANT (from
), 1)
7489 && (constp
>= 0 || to_more_cv_qualified
);
7493 /* When comparing, say, char ** to char const **, this function takes the
7494 'char *' and 'char const *'. Do not pass non-pointer types to this
7498 comp_ptr_ttypes (to
, from
)
7501 return comp_ptr_ttypes_real (to
, from
, 1);
7504 /* Returns 1 if to and from are (possibly multi-level) pointers to the same
7505 type or inheritance-related types, regardless of cv-quals. */
7508 ptr_reasonably_similar (to
, from
)
7511 for (; ; to
= TREE_TYPE (to
), from
= TREE_TYPE (from
))
7513 if (TREE_CODE (to
) != TREE_CODE (from
))
7516 if (TREE_CODE (from
) == OFFSET_TYPE
7517 && comptypes (TYPE_OFFSET_BASETYPE (to
),
7518 TYPE_OFFSET_BASETYPE (from
), -1))
7521 if (TREE_CODE (to
) != POINTER_TYPE
)
7523 (TYPE_MAIN_VARIANT (to
), TYPE_MAIN_VARIANT (from
), -1);
7527 /* Like comp_ptr_ttypes, for const_cast. */
7530 comp_ptr_ttypes_const (to
, from
)
7533 for (; ; to
= TREE_TYPE (to
), from
= TREE_TYPE (from
))
7535 if (TREE_CODE (to
) != TREE_CODE (from
))
7538 if (TREE_CODE (from
) == OFFSET_TYPE
7539 && comptypes (TYPE_OFFSET_BASETYPE (from
),
7540 TYPE_OFFSET_BASETYPE (to
), 1))
7543 if (TREE_CODE (to
) != POINTER_TYPE
)
7544 return comptypes (TYPE_MAIN_VARIANT (to
), TYPE_MAIN_VARIANT (from
), 1);
7548 /* Like comp_ptr_ttypes, for reinterpret_cast. */
7551 comp_ptr_ttypes_reinterpret (to
, from
)
7556 for (; ; to
= TREE_TYPE (to
), from
= TREE_TYPE (from
))
7558 if (TREE_CODE (from
) == OFFSET_TYPE
)
7559 from
= TREE_TYPE (from
);
7560 if (TREE_CODE (to
) == OFFSET_TYPE
)
7561 to
= TREE_TYPE (to
);
7563 if (TREE_CODE (to
) != TREE_CODE (from
))
7566 /* Const and volatile mean something different for function types,
7567 so the usual checks are not appropriate. */
7568 if (TREE_CODE (to
) != FUNCTION_TYPE
&& TREE_CODE (to
) != METHOD_TYPE
)
7570 if (TYPE_READONLY (from
) > TYPE_READONLY (to
)
7571 || TYPE_VOLATILE (from
) > TYPE_VOLATILE (to
))
7575 && (TYPE_READONLY (to
) > TYPE_READONLY (from
)
7576 || TYPE_VOLATILE (to
) > TYPE_READONLY (from
)))
7578 constp
&= TYPE_READONLY (to
);
7581 if (TREE_CODE (to
) != POINTER_TYPE
)