1 /* RunTime Type Identification
2 Copyright (C) 1995-2015 Free Software Foundation, Inc.
3 Mostly written by Jason Merrill (jason@cygnus.com).
5 This file is part of GCC.
7 GCC 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 3, or (at your option)
12 GCC 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 GCC; see the file COPYING3. If not see
19 <http://www.gnu.org/licenses/>. */
24 #include "coretypes.h"
30 #include "stringpool.h"
31 #include "stor-layout.h"
36 #include "c-family/c-pragma.h"
38 /* C++ returns type information to the user in struct type_info
39 objects. We also use type information to implement dynamic_cast and
40 exception handlers. Type information for a particular type is
41 indicated with an ABI defined structure derived from type_info.
42 This would all be very straight forward, but for the fact that the
43 runtime library provides the definitions of the type_info structure
44 and the ABI defined derived classes. We cannot build declarations
45 of them directly in the compiler, but we need to layout objects of
46 their type. Somewhere we have to lie.
48 We define layout compatible POD-structs with compiler-defined names
49 and generate the appropriate initializations for them (complete
50 with explicit mention of their vtable). When we have to provide a
51 type_info to the user we reinterpret_cast the internal compiler
52 type to type_info. A well formed program can only explicitly refer
53 to the type_infos of complete types (& cv void). However, we chain
54 pointer type_infos to the pointed-to-type, and that can be
55 incomplete. We only need the addresses of such incomplete
56 type_info objects for static initialization.
58 The type information VAR_DECL of a type is held on the
59 IDENTIFIER_GLOBAL_VALUE of the type's mangled name. That VAR_DECL
60 will be the internal type. It will usually have the correct
61 internal type reflecting the kind of type it represents (pointer,
62 array, function, class, inherited class, etc). When the type it
63 represents is incomplete, it will have the internal type
64 corresponding to type_info. That will only happen at the end of
65 translation, when we are emitting the type info objects. */
67 /* Auxiliary data we hold for each type_info derived object we need. */
68 typedef struct GTY (()) tinfo_s
{
69 tree type
; /* The RECORD_TYPE for this type_info object */
71 tree vtable
; /* The VAR_DECL of the vtable. Only filled at end of
74 tree name
; /* IDENTIFIER_NODE for the ABI specified name of
75 the type_info derived type. */
79 typedef enum tinfo_kind
81 TK_TYPE_INFO_TYPE
, /* abi::__type_info_pseudo */
82 TK_BASE_TYPE
, /* abi::__base_class_type_info */
83 TK_BUILTIN_TYPE
, /* abi::__fundamental_type_info */
84 TK_ARRAY_TYPE
, /* abi::__array_type_info */
85 TK_FUNCTION_TYPE
, /* abi::__function_type_info */
86 TK_ENUMERAL_TYPE
, /* abi::__enum_type_info */
87 TK_POINTER_TYPE
, /* abi::__pointer_type_info */
88 TK_POINTER_MEMBER_TYPE
, /* abi::__pointer_to_member_type_info */
89 TK_CLASS_TYPE
, /* abi::__class_type_info */
90 TK_SI_CLASS_TYPE
, /* abi::__si_class_type_info */
91 TK_FIXED
/* end of fixed descriptors. */
92 /* ... abi::__vmi_type_info<I> */
95 /* Helper macro to get maximum scalar-width of pointer or of the 'long'-type.
96 This of interest for llp64 targets. */
98 integer_types[(POINTER_SIZE <= TYPE_PRECISION (integer_types[itk_long]) \
99 ? itk_long : itk_long_long)]
101 /* A vector of all tinfo decls that haven't yet been emitted. */
102 vec
<tree
, va_gc
> *unemitted_tinfo_decls
;
104 /* A vector of all type_info derived types we need. The first few are
105 fixed and created early. The remainder are for multiple inheritance
106 and are generated as needed. */
107 static GTY (()) vec
<tinfo_s
, va_gc
> *tinfo_descs
;
109 static tree
ifnonnull (tree
, tree
, tsubst_flags_t
);
110 static tree
tinfo_name (tree
, bool);
111 static tree
build_dynamic_cast_1 (tree
, tree
, tsubst_flags_t
);
112 static tree
throw_bad_cast (void);
113 static tree
throw_bad_typeid (void);
114 static tree
get_tinfo_ptr (tree
);
115 static bool typeid_ok_p (void);
116 static int qualifier_flags (tree
);
117 static bool target_incomplete_p (tree
);
118 static tree
tinfo_base_init (tinfo_s
*, tree
);
119 static tree
generic_initializer (tinfo_s
*, tree
);
120 static tree
ptr_initializer (tinfo_s
*, tree
);
121 static tree
ptm_initializer (tinfo_s
*, tree
);
122 static tree
class_initializer (tinfo_s
*, tree
, unsigned, ...);
123 static void create_pseudo_type_info (int, const char *, ...);
124 static tree
get_pseudo_ti_init (tree
, unsigned);
125 static unsigned get_pseudo_ti_index (tree
);
126 static void create_tinfo_types (void);
127 static bool typeinfo_in_lib_p (tree
);
129 static int doing_runtime
= 0;
132 push_abi_namespace (void)
134 push_nested_namespace (abi_node
);
135 push_visibility ("default", 2);
139 pop_abi_namespace (void)
142 pop_nested_namespace (abi_node
);
145 /* Declare language defined type_info type and a pointer to const
146 type_info. This is incomplete here, and will be completed when
147 the user #includes <typeinfo>. There are language defined
148 restrictions on what can be done until that is included. Create
149 the internal versions of the ABI types. */
152 init_rtti_processing (void)
156 push_namespace (std_identifier
);
157 type_info_type
= xref_tag (class_type
, get_identifier ("type_info"),
158 /*tag_scope=*/ts_current
, false);
160 const_type_info_type_node
161 = cp_build_qualified_type (type_info_type
, TYPE_QUAL_CONST
);
162 type_info_ptr_type
= build_pointer_type (const_type_info_type_node
);
164 vec_alloc (unemitted_tinfo_decls
, 124);
166 create_tinfo_types ();
169 /* Given the expression EXP of type `class *', return the head of the
170 object pointed to by EXP with type cv void*, if the class has any
171 virtual functions (TYPE_POLYMORPHIC_P), else just return the
175 build_headof (tree exp
)
177 tree type
= TREE_TYPE (exp
);
181 gcc_assert (TYPE_PTR_P (type
));
182 type
= TREE_TYPE (type
);
184 if (!TYPE_POLYMORPHIC_P (type
))
187 /* We use this a couple of times below, protect it. */
188 exp
= save_expr (exp
);
190 /* The offset-to-top field is at index -2 from the vptr. */
191 index
= build_int_cst (NULL_TREE
,
192 -2 * TARGET_VTABLE_DATA_ENTRY_DISTANCE
);
194 offset
= build_vtbl_ref (cp_build_indirect_ref (exp
, RO_NULL
,
195 tf_warning_or_error
),
198 type
= cp_build_qualified_type (ptr_type_node
,
199 cp_type_quals (TREE_TYPE (exp
)));
200 return fold_build_pointer_plus (exp
, offset
);
203 /* Get a bad_cast node for the program to throw...
205 See libstdc++/exception.cc for __throw_bad_cast */
208 throw_bad_cast (void)
210 tree fn
= get_identifier ("__cxa_bad_cast");
211 if (!get_global_value_if_present (fn
, &fn
))
212 fn
= push_throw_library_fn (fn
, build_function_type_list (ptr_type_node
,
215 return build_cxx_call (fn
, 0, NULL
, tf_warning_or_error
);
218 /* Return an expression for "__cxa_bad_typeid()". The expression
219 returned is an lvalue of type "const std::type_info". */
222 throw_bad_typeid (void)
224 tree fn
= get_identifier ("__cxa_bad_typeid");
225 if (!get_global_value_if_present (fn
, &fn
))
229 t
= build_reference_type (const_type_info_type_node
);
230 t
= build_function_type_list (t
, NULL_TREE
);
231 fn
= push_throw_library_fn (fn
, t
);
234 return build_cxx_call (fn
, 0, NULL
, tf_warning_or_error
);
237 /* Return an lvalue expression whose type is "const std::type_info"
238 and whose value indicates the type of the expression EXP. If EXP
239 is a reference to a polymorphic class, return the dynamic type;
240 otherwise return the static type of the expression. */
243 get_tinfo_decl_dynamic (tree exp
, tsubst_flags_t complain
)
248 if (error_operand_p (exp
))
249 return error_mark_node
;
251 exp
= resolve_nondeduced_context (exp
);
253 /* peel back references, so they match. */
254 type
= non_reference (TREE_TYPE (exp
));
256 /* Peel off cv qualifiers. */
257 type
= TYPE_MAIN_VARIANT (type
);
259 /* For UNKNOWN_TYPEs call complete_type_or_else to get diagnostics. */
260 if (CLASS_TYPE_P (type
) || type
== unknown_type_node
261 || type
== init_list_type_node
)
262 type
= complete_type_or_maybe_complain (type
, exp
, complain
);
265 return error_mark_node
;
267 /* If exp is a reference to polymorphic type, get the real type_info. */
268 if (TYPE_POLYMORPHIC_P (type
) && ! resolves_to_fixed_type_p (exp
, 0))
270 /* build reference to type_info from vtable. */
273 /* The RTTI information is at index -1. */
274 index
= build_int_cst (NULL_TREE
,
275 -1 * TARGET_VTABLE_DATA_ENTRY_DISTANCE
);
276 t
= build_vtbl_ref (exp
, index
);
277 t
= convert (type_info_ptr_type
, t
);
280 /* Otherwise return the type_info for the static type of the expr. */
281 t
= get_tinfo_ptr (TYPE_MAIN_VARIANT (type
));
283 return cp_build_indirect_ref (t
, RO_NULL
, complain
);
289 tree pseudo_type_info
, type_info_type
;
293 error ("cannot use typeid with -fno-rtti");
297 if (!COMPLETE_TYPE_P (const_type_info_type_node
))
299 error ("must #include <typeinfo> before using typeid");
303 pseudo_type_info
= (*tinfo_descs
)[TK_TYPE_INFO_TYPE
].type
;
304 type_info_type
= TYPE_MAIN_VARIANT (const_type_info_type_node
);
306 /* Make sure abi::__type_info_pseudo has the same alias set
307 as std::type_info. */
308 if (! TYPE_ALIAS_SET_KNOWN_P (pseudo_type_info
))
309 TYPE_ALIAS_SET (pseudo_type_info
) = get_alias_set (type_info_type
);
311 gcc_assert (TYPE_ALIAS_SET (pseudo_type_info
)
312 == get_alias_set (type_info_type
));
317 /* Return an expression for "typeid(EXP)". The expression returned is
318 an lvalue of type "const std::type_info". */
321 build_typeid (tree exp
, tsubst_flags_t complain
)
323 tree cond
= NULL_TREE
, initial_expr
= exp
;
326 if (exp
== error_mark_node
|| !typeid_ok_p ())
327 return error_mark_node
;
329 if (processing_template_decl
)
330 return build_min (TYPEID_EXPR
, const_type_info_type_node
, exp
);
332 /* FIXME when integrating with c_fully_fold, mark
333 resolves_to_fixed_type_p case as a non-constant expression. */
334 if (TYPE_POLYMORPHIC_P (TREE_TYPE (exp
))
335 && ! resolves_to_fixed_type_p (exp
, &nonnull
)
338 /* So we need to look into the vtable of the type of exp.
339 Make sure it isn't a null lvalue. */
340 exp
= cp_build_addr_expr (exp
, complain
);
341 exp
= stabilize_reference (exp
);
342 cond
= cp_convert (boolean_type_node
, exp
, complain
);
343 exp
= cp_build_indirect_ref (exp
, RO_NULL
, complain
);
346 exp
= get_tinfo_decl_dynamic (exp
, complain
);
348 if (exp
== error_mark_node
)
349 return error_mark_node
;
353 tree bad
= throw_bad_typeid ();
355 exp
= build3 (COND_EXPR
, TREE_TYPE (exp
), cond
, exp
, bad
);
358 mark_type_use (initial_expr
);
363 /* Generate the NTBS name of a type. If MARK_PRIVATE, put a '*' in front so that
364 comparisons will be done by pointer rather than string comparison. */
366 tinfo_name (tree type
, bool mark_private
)
372 name
= mangle_type_string (type
);
373 length
= strlen (name
);
377 /* Inject '*' at beginning of name to force pointer comparison. */
378 char* buf
= (char*) XALLOCAVEC (char, length
+ 2);
380 memcpy (buf
+ 1, name
, length
+ 1);
381 name_string
= build_string (length
+ 2, buf
);
384 name_string
= build_string (length
+ 1, name
);
386 return fix_string_type (name_string
);
389 /* Return a VAR_DECL for the internal ABI defined type_info object for
390 TYPE. You must arrange that the decl is mark_used, if actually use
391 it --- decls in vtables are only used if the vtable is output. */
394 get_tinfo_decl (tree type
)
399 if (variably_modified_type_p (type
, /*fn=*/NULL_TREE
))
401 error ("cannot create type information for type %qT because "
402 "it involves types of variable size",
404 return error_mark_node
;
407 if (TREE_CODE (type
) == METHOD_TYPE
)
408 type
= build_function_type (TREE_TYPE (type
),
409 TREE_CHAIN (TYPE_ARG_TYPES (type
)));
411 type
= complete_type (type
);
413 /* For a class type, the variable is cached in the type node
415 if (CLASS_TYPE_P (type
))
417 d
= CLASSTYPE_TYPEINFO_VAR (TYPE_MAIN_VARIANT (type
));
422 name
= mangle_typeinfo_for_type (type
);
424 d
= IDENTIFIER_GLOBAL_VALUE (name
);
427 int ix
= get_pseudo_ti_index (type
);
428 tinfo_s
*ti
= &(*tinfo_descs
)[ix
];
430 d
= build_lang_decl (VAR_DECL
, name
, ti
->type
);
431 SET_DECL_ASSEMBLER_NAME (d
, name
);
432 /* Remember the type it is for. */
433 TREE_TYPE (name
) = type
;
434 DECL_TINFO_P (d
) = 1;
435 DECL_ARTIFICIAL (d
) = 1;
436 DECL_IGNORED_P (d
) = 1;
437 TREE_READONLY (d
) = 1;
439 /* Mark the variable as undefined -- but remember that we can
440 define it later if we need to do so. */
441 DECL_EXTERNAL (d
) = 1;
442 DECL_NOT_REALLY_EXTERN (d
) = 1;
443 set_linkage_according_to_type (type
, d
);
445 d
= pushdecl_top_level_and_finish (d
, NULL_TREE
);
446 if (CLASS_TYPE_P (type
))
447 CLASSTYPE_TYPEINFO_VAR (TYPE_MAIN_VARIANT (type
)) = d
;
449 /* Add decl to the global array of tinfo decls. */
450 vec_safe_push (unemitted_tinfo_decls
, d
);
456 /* Return a pointer to a type_info object describing TYPE, suitably
457 cast to the language defined type. */
460 get_tinfo_ptr (tree type
)
462 tree decl
= get_tinfo_decl (type
);
465 return build_nop (type_info_ptr_type
,
466 build_address (decl
));
469 /* Return the type_info object for TYPE. */
472 get_typeid (tree type
, tsubst_flags_t complain
)
474 if (type
== error_mark_node
|| !typeid_ok_p ())
475 return error_mark_node
;
477 if (processing_template_decl
)
478 return build_min (TYPEID_EXPR
, const_type_info_type_node
, type
);
480 /* If the type of the type-id is a reference type, the result of the
481 typeid expression refers to a type_info object representing the
483 type
= non_reference (type
);
485 /* This is not one of the uses of a qualified function type in 8.3.5. */
486 if (TREE_CODE (type
) == FUNCTION_TYPE
487 && (type_memfn_quals (type
) != TYPE_UNQUALIFIED
488 || type_memfn_rqual (type
) != REF_QUAL_NONE
))
490 if (complain
& tf_error
)
491 error ("typeid of qualified function type %qT", type
);
492 return error_mark_node
;
495 /* The top-level cv-qualifiers of the lvalue expression or the type-id
496 that is the operand of typeid are always ignored. */
497 type
= TYPE_MAIN_VARIANT (type
);
499 /* For UNKNOWN_TYPEs call complete_type_or_else to get diagnostics. */
500 if (CLASS_TYPE_P (type
) || type
== unknown_type_node
501 || type
== init_list_type_node
)
502 type
= complete_type_or_maybe_complain (type
, NULL_TREE
, complain
);
505 return error_mark_node
;
507 return cp_build_indirect_ref (get_tinfo_ptr (type
), RO_NULL
, complain
);
510 /* Check whether TEST is null before returning RESULT. If TEST is used in
511 RESULT, it must have previously had a save_expr applied to it. */
514 ifnonnull (tree test
, tree result
, tsubst_flags_t complain
)
516 return build3 (COND_EXPR
, TREE_TYPE (result
),
517 build2 (EQ_EXPR
, boolean_type_node
, test
,
518 cp_convert (TREE_TYPE (test
), nullptr_node
,
520 cp_convert (TREE_TYPE (result
), nullptr_node
, complain
),
524 /* Execute a dynamic cast, as described in section 5.2.6 of the 9/93 working
528 build_dynamic_cast_1 (tree type
, tree expr
, tsubst_flags_t complain
)
530 enum tree_code tc
= TREE_CODE (type
);
533 tree old_expr
= expr
;
534 const char *errstr
= NULL
;
536 /* Save casted types in the function's used types hash table. */
537 used_types_insert (type
);
539 /* T shall be a pointer or reference to a complete class type, or
540 `pointer to cv void''. */
544 if (VOID_TYPE_P (TREE_TYPE (type
)))
548 if (! MAYBE_CLASS_TYPE_P (TREE_TYPE (type
)))
550 errstr
= _("target is not pointer or reference to class");
553 if (!COMPLETE_TYPE_P (complete_type (TREE_TYPE (type
))))
555 errstr
= _("target is not pointer or reference to complete type");
561 errstr
= _("target is not pointer or reference");
565 if (tc
== POINTER_TYPE
)
567 expr
= decay_conversion (expr
, complain
);
568 exprtype
= TREE_TYPE (expr
);
570 /* If T is a pointer type, v shall be an rvalue of a pointer to
571 complete class type, and the result is an rvalue of type T. */
573 expr
= mark_rvalue_use (expr
);
575 if (!TYPE_PTR_P (exprtype
))
577 errstr
= _("source is not a pointer");
580 if (! MAYBE_CLASS_TYPE_P (TREE_TYPE (exprtype
)))
582 errstr
= _("source is not a pointer to class");
585 if (!COMPLETE_TYPE_P (complete_type (TREE_TYPE (exprtype
))))
587 errstr
= _("source is a pointer to incomplete type");
593 expr
= mark_lvalue_use (expr
);
595 exprtype
= build_reference_type (TREE_TYPE (expr
));
597 /* T is a reference type, v shall be an lvalue of a complete class
598 type, and the result is an lvalue of the type referred to by T. */
600 if (! MAYBE_CLASS_TYPE_P (TREE_TYPE (exprtype
)))
602 errstr
= _("source is not of class type");
605 if (!COMPLETE_TYPE_P (complete_type (TREE_TYPE (exprtype
))))
607 errstr
= _("source is of incomplete class type");
612 /* The dynamic_cast operator shall not cast away constness. */
613 if (!at_least_as_qualified_p (TREE_TYPE (type
),
614 TREE_TYPE (exprtype
)))
616 errstr
= _("conversion casts away constness");
620 /* If *type is an unambiguous accessible base class of *exprtype,
621 convert statically. */
623 tree binfo
= lookup_base (TREE_TYPE (exprtype
), TREE_TYPE (type
),
624 ba_check
, NULL
, complain
);
626 return build_static_cast (type
, expr
, complain
);
629 /* Apply trivial conversion T -> T& for dereferenced ptrs. */
630 if (tc
== REFERENCE_TYPE
)
631 expr
= convert_to_reference (exprtype
, expr
, CONV_IMPLICIT
,
632 LOOKUP_NORMAL
, NULL_TREE
, complain
);
634 /* Otherwise *exprtype must be a polymorphic class (have a vtbl). */
635 if (TYPE_POLYMORPHIC_P (TREE_TYPE (exprtype
)))
638 /* if TYPE is `void *', return pointer to complete object. */
639 if (tc
== POINTER_TYPE
&& VOID_TYPE_P (TREE_TYPE (type
)))
641 /* if b is an object, dynamic_cast<void *>(&b) == (void *)&b. */
642 if (TREE_CODE (expr
) == ADDR_EXPR
643 && VAR_P (TREE_OPERAND (expr
, 0))
644 && TREE_CODE (TREE_TYPE (TREE_OPERAND (expr
, 0))) == RECORD_TYPE
)
645 return build1 (NOP_EXPR
, type
, expr
);
647 /* Since expr is used twice below, save it. */
648 expr
= save_expr (expr
);
650 expr1
= build_headof (expr
);
651 if (TREE_TYPE (expr1
) != type
)
652 expr1
= build1 (NOP_EXPR
, type
, expr1
);
653 return ifnonnull (expr
, expr1
, complain
);
658 tree result
, td2
, td3
;
660 tree static_type
, target_type
, boff
;
662 /* If we got here, we can't convert statically. Therefore,
663 dynamic_cast<D&>(b) (b an object) cannot succeed. */
664 if (tc
== REFERENCE_TYPE
)
667 && TREE_CODE (TREE_TYPE (old_expr
)) == RECORD_TYPE
)
669 tree expr
= throw_bad_cast ();
670 if (complain
& tf_warning
)
671 warning (0, "dynamic_cast of %q#D to %q#T can never succeed",
673 /* Bash it to the expected type. */
674 TREE_TYPE (expr
) = type
;
678 /* Ditto for dynamic_cast<D*>(&b). */
679 else if (TREE_CODE (expr
) == ADDR_EXPR
)
681 tree op
= TREE_OPERAND (expr
, 0);
683 && TREE_CODE (TREE_TYPE (op
)) == RECORD_TYPE
)
685 if (complain
& tf_warning
)
686 warning (0, "dynamic_cast of %q#D to %q#T can never succeed",
688 retval
= build_int_cst (type
, 0);
693 /* Use of dynamic_cast when -fno-rtti is prohibited. */
696 if (complain
& tf_error
)
697 error ("%<dynamic_cast%> not permitted with -fno-rtti");
698 return error_mark_node
;
701 target_type
= TYPE_MAIN_VARIANT (TREE_TYPE (type
));
702 static_type
= TYPE_MAIN_VARIANT (TREE_TYPE (exprtype
));
703 td2
= get_tinfo_decl (target_type
);
704 if (!mark_used (td2
, complain
) && !(complain
& tf_error
))
705 return error_mark_node
;
706 td2
= cp_build_addr_expr (td2
, complain
);
707 td3
= get_tinfo_decl (static_type
);
708 if (!mark_used (td3
, complain
) && !(complain
& tf_error
))
709 return error_mark_node
;
710 td3
= cp_build_addr_expr (td3
, complain
);
712 /* Determine how T and V are related. */
713 boff
= dcast_base_hint (static_type
, target_type
);
715 /* Since expr is used twice below, save it. */
716 expr
= save_expr (expr
);
719 if (tc
== REFERENCE_TYPE
)
720 expr1
= cp_build_addr_expr (expr1
, complain
);
727 dcast_fn
= dynamic_cast_node
;
734 push_abi_namespace ();
735 tinfo_ptr
= xref_tag (class_type
,
736 get_identifier ("__class_type_info"),
737 /*tag_scope=*/ts_current
, false);
739 tinfo_ptr
= build_pointer_type
740 (cp_build_qualified_type
741 (tinfo_ptr
, TYPE_QUAL_CONST
));
742 name
= "__dynamic_cast";
743 tmp
= build_function_type_list (ptr_type_node
,
745 tinfo_ptr
, tinfo_ptr
,
746 ptrdiff_type_node
, NULL_TREE
);
747 dcast_fn
= build_library_fn_ptr (name
, tmp
,
748 ECF_LEAF
| ECF_PURE
| ECF_NOTHROW
);
749 pop_abi_namespace ();
750 dynamic_cast_node
= dcast_fn
;
752 result
= build_cxx_call (dcast_fn
, 4, elems
, complain
);
754 if (tc
== REFERENCE_TYPE
)
756 tree bad
= throw_bad_cast ();
759 result
= save_expr (result
);
760 neq
= cp_truthvalue_conversion (result
);
761 return cp_convert (type
,
762 build3 (COND_EXPR
, TREE_TYPE (result
),
763 neq
, result
, bad
), complain
);
766 /* Now back to the type we want from a void*. */
767 result
= cp_convert (type
, result
, complain
);
768 return ifnonnull (expr
, result
, complain
);
772 errstr
= _("source type is not polymorphic");
775 if (complain
& tf_error
)
776 error ("cannot dynamic_cast %qE (of type %q#T) to type %q#T (%s)",
777 old_expr
, TREE_TYPE (old_expr
), type
, errstr
);
778 return error_mark_node
;
782 build_dynamic_cast (tree type
, tree expr
, tsubst_flags_t complain
)
786 if (type
== error_mark_node
|| expr
== error_mark_node
)
787 return error_mark_node
;
789 if (processing_template_decl
)
791 expr
= build_min (DYNAMIC_CAST_EXPR
, type
, expr
);
792 TREE_SIDE_EFFECTS (expr
) = 1;
793 return convert_from_reference (expr
);
796 r
= convert_from_reference (build_dynamic_cast_1 (type
, expr
, complain
));
797 if (r
!= error_mark_node
)
798 maybe_warn_about_useless_cast (type
, expr
, complain
);
802 /* Return the runtime bit mask encoding the qualifiers of TYPE. */
805 qualifier_flags (tree type
)
808 int quals
= cp_type_quals (type
);
810 if (quals
& TYPE_QUAL_CONST
)
812 if (quals
& TYPE_QUAL_VOLATILE
)
814 if (quals
& TYPE_QUAL_RESTRICT
)
819 /* Return true, if the pointer chain TYPE ends at an incomplete type, or
820 contains a pointer to member of an incomplete class. */
823 target_incomplete_p (tree type
)
826 if (TYPE_PTRDATAMEM_P (type
))
828 if (!COMPLETE_TYPE_P (TYPE_PTRMEM_CLASS_TYPE (type
)))
830 type
= TYPE_PTRMEM_POINTED_TO_TYPE (type
);
832 else if (TYPE_PTR_P (type
))
833 type
= TREE_TYPE (type
);
835 return !COMPLETE_OR_VOID_TYPE_P (type
);
838 /* Returns true if TYPE involves an incomplete class type; in that
839 case, typeinfo variables for TYPE should be emitted with internal
843 involves_incomplete_p (tree type
)
845 switch (TREE_CODE (type
))
848 return target_incomplete_p (TREE_TYPE (type
));
853 (target_incomplete_p (TYPE_PTRMEM_POINTED_TO_TYPE (type
))
854 || !COMPLETE_TYPE_P (TYPE_PTRMEM_CLASS_TYPE (type
)));
857 if (TYPE_PTRMEMFUNC_P (type
))
861 if (!COMPLETE_TYPE_P (type
))
865 /* All other types do not involve incomplete class types. */
870 /* Return a CONSTRUCTOR for the common part of the type_info objects. This
871 is the vtable pointer and NTBS name. The NTBS name is emitted as a
872 comdat const char array, so it becomes a unique key for the type. Generate
873 and emit that VAR_DECL here. (We can't always emit the type_info itself
874 as comdat, because of pointers to incomplete.) */
877 tinfo_base_init (tinfo_s
*ti
, tree target
)
882 vec
<constructor_elt
, va_gc
> *v
;
885 tree name_name
, name_string
;
887 /* Generate the NTBS array variable. */
888 tree name_type
= build_cplus_array_type
889 (cp_build_qualified_type (char_type_node
, TYPE_QUAL_CONST
),
892 /* Determine the name of the variable -- and remember with which
893 type it is associated. */
894 name_name
= mangle_typeinfo_string_for_type (target
);
895 TREE_TYPE (name_name
) = target
;
897 name_decl
= build_lang_decl (VAR_DECL
, name_name
, name_type
);
898 SET_DECL_ASSEMBLER_NAME (name_decl
, name_name
);
899 DECL_ARTIFICIAL (name_decl
) = 1;
900 DECL_IGNORED_P (name_decl
) = 1;
901 TREE_READONLY (name_decl
) = 1;
902 TREE_STATIC (name_decl
) = 1;
903 DECL_EXTERNAL (name_decl
) = 0;
904 DECL_TINFO_P (name_decl
) = 1;
905 set_linkage_according_to_type (target
, name_decl
);
906 import_export_decl (name_decl
);
907 name_string
= tinfo_name (target
, !TREE_PUBLIC (name_decl
));
908 DECL_INITIAL (name_decl
) = name_string
;
909 mark_used (name_decl
);
910 pushdecl_top_level_and_finish (name_decl
, name_string
);
913 vtable_ptr
= ti
->vtable
;
917 push_abi_namespace ();
918 real_type
= xref_tag (class_type
, ti
->name
,
919 /*tag_scope=*/ts_current
, false);
920 pop_abi_namespace ();
922 if (!COMPLETE_TYPE_P (real_type
))
924 /* We never saw a definition of this type, so we need to
925 tell the compiler that this is an exported class, as
926 indeed all of the __*_type_info classes are. */
927 SET_CLASSTYPE_INTERFACE_KNOWN (real_type
);
928 CLASSTYPE_INTERFACE_ONLY (real_type
) = 1;
931 vtable_ptr
= get_vtable_decl (real_type
, /*complete=*/1);
932 vtable_ptr
= cp_build_addr_expr (vtable_ptr
, tf_warning_or_error
);
934 /* We need to point into the middle of the vtable. */
935 vtable_ptr
= fold_build_pointer_plus
937 size_binop (MULT_EXPR
,
938 size_int (2 * TARGET_VTABLE_DATA_ENTRY_DISTANCE
),
939 TYPE_SIZE_UNIT (vtable_entry_type
)));
941 ti
->vtable
= vtable_ptr
;
945 CONSTRUCTOR_APPEND_ELT (v
, NULL_TREE
, vtable_ptr
);
946 CONSTRUCTOR_APPEND_ELT (v
, NULL_TREE
,
947 decay_conversion (name_decl
, tf_warning_or_error
));
949 init
= build_constructor (init_list_type_node
, v
);
950 TREE_CONSTANT (init
) = 1;
951 TREE_STATIC (init
) = 1;
956 /* Return the CONSTRUCTOR expr for a type_info of TYPE. TI provides the
957 information about the particular type_info derivation, which adds no
958 additional fields to the type_info base. */
961 generic_initializer (tinfo_s
*ti
, tree target
)
963 tree init
= tinfo_base_init (ti
, target
);
965 init
= build_constructor_single (init_list_type_node
, NULL_TREE
, init
);
966 TREE_CONSTANT (init
) = 1;
967 TREE_STATIC (init
) = 1;
971 /* Return the CONSTRUCTOR expr for a type_info of pointer TYPE.
972 TI provides information about the particular type_info derivation,
973 which adds target type and qualifier flags members to the type_info base. */
976 ptr_initializer (tinfo_s
*ti
, tree target
)
978 tree init
= tinfo_base_init (ti
, target
);
979 tree to
= TREE_TYPE (target
);
980 int flags
= qualifier_flags (to
);
981 bool incomplete
= target_incomplete_p (to
);
982 vec
<constructor_elt
, va_gc
> *v
;
987 CONSTRUCTOR_APPEND_ELT (v
, NULL_TREE
, init
);
988 CONSTRUCTOR_APPEND_ELT (v
, NULL_TREE
, build_int_cst (NULL_TREE
, flags
));
989 CONSTRUCTOR_APPEND_ELT (v
, NULL_TREE
,
990 get_tinfo_ptr (TYPE_MAIN_VARIANT (to
)));
992 init
= build_constructor (init_list_type_node
, v
);
993 TREE_CONSTANT (init
) = 1;
994 TREE_STATIC (init
) = 1;
998 /* Return the CONSTRUCTOR expr for a type_info of pointer to member data TYPE.
999 TI provides information about the particular type_info derivation,
1000 which adds class, target type and qualifier flags members to the type_info
1004 ptm_initializer (tinfo_s
*ti
, tree target
)
1006 tree init
= tinfo_base_init (ti
, target
);
1007 tree to
= TYPE_PTRMEM_POINTED_TO_TYPE (target
);
1008 tree klass
= TYPE_PTRMEM_CLASS_TYPE (target
);
1009 int flags
= qualifier_flags (to
);
1010 bool incomplete
= target_incomplete_p (to
);
1011 vec
<constructor_elt
, va_gc
> *v
;
1016 if (!COMPLETE_TYPE_P (klass
))
1018 CONSTRUCTOR_APPEND_ELT (v
, NULL_TREE
, init
);
1019 CONSTRUCTOR_APPEND_ELT (v
, NULL_TREE
, build_int_cst (NULL_TREE
, flags
));
1020 CONSTRUCTOR_APPEND_ELT (v
, NULL_TREE
,
1021 get_tinfo_ptr (TYPE_MAIN_VARIANT (to
)));
1022 CONSTRUCTOR_APPEND_ELT (v
, NULL_TREE
, get_tinfo_ptr (klass
));
1024 init
= build_constructor (init_list_type_node
, v
);
1025 TREE_CONSTANT (init
) = 1;
1026 TREE_STATIC (init
) = 1;
1030 /* Return the CONSTRUCTOR expr for a type_info of class TYPE.
1031 TI provides information about the particular __class_type_info derivation,
1032 which adds hint flags and N extra initializers to the type_info base. */
1035 class_initializer (tinfo_s
*ti
, tree target
, unsigned n
, ...)
1037 tree init
= tinfo_base_init (ti
, target
);
1038 va_list extra_inits
;
1040 vec
<constructor_elt
, va_gc
> *v
;
1043 CONSTRUCTOR_APPEND_ELT (v
, NULL_TREE
, init
);
1044 va_start (extra_inits
, n
);
1045 for (i
= 0; i
< n
; i
++)
1046 CONSTRUCTOR_APPEND_ELT (v
, NULL_TREE
, va_arg (extra_inits
, tree
));
1047 va_end (extra_inits
);
1049 init
= build_constructor (init_list_type_node
, v
);
1050 TREE_CONSTANT (init
) = 1;
1051 TREE_STATIC (init
) = 1;
1055 /* Returns true if the typeinfo for type should be placed in
1056 the runtime library. */
1059 typeinfo_in_lib_p (tree type
)
1061 /* The typeinfo objects for `T*' and `const T*' are in the runtime
1062 library for simple types T. */
1063 if (TYPE_PTR_P (type
)
1064 && (cp_type_quals (TREE_TYPE (type
)) == TYPE_QUAL_CONST
1065 || cp_type_quals (TREE_TYPE (type
)) == TYPE_UNQUALIFIED
))
1066 type
= TREE_TYPE (type
);
1068 switch (TREE_CODE (type
))
1085 /* Generate the initializer for the type info describing TYPE. TK_INDEX is
1086 the index of the descriptor in the tinfo_desc vector. */
1089 get_pseudo_ti_init (tree type
, unsigned tk_index
)
1091 tinfo_s
*ti
= &(*tinfo_descs
)[tk_index
];
1093 gcc_assert (at_eof
);
1096 case TK_POINTER_MEMBER_TYPE
:
1097 return ptm_initializer (ti
, type
);
1099 case TK_POINTER_TYPE
:
1100 return ptr_initializer (ti
, type
);
1102 case TK_BUILTIN_TYPE
:
1103 case TK_ENUMERAL_TYPE
:
1104 case TK_FUNCTION_TYPE
:
1106 return generic_initializer (ti
, type
);
1109 return class_initializer (ti
, type
, 0);
1111 case TK_SI_CLASS_TYPE
:
1113 tree base_binfo
= BINFO_BASE_BINFO (TYPE_BINFO (type
), 0);
1114 tree tinfo
= get_tinfo_ptr (BINFO_TYPE (base_binfo
));
1116 /* get_tinfo_ptr might have reallocated the tinfo_descs vector. */
1117 ti
= &(*tinfo_descs
)[tk_index
];
1118 return class_initializer (ti
, type
, 1, tinfo
);
1123 int hint
= ((CLASSTYPE_REPEATED_BASE_P (type
) << 0)
1124 | (CLASSTYPE_DIAMOND_SHAPED_P (type
) << 1));
1125 tree binfo
= TYPE_BINFO (type
);
1126 int nbases
= BINFO_N_BASE_BINFOS (binfo
);
1127 vec
<tree
, va_gc
> *base_accesses
= BINFO_BASE_ACCESSES (binfo
);
1128 tree offset_type
= LONGPTR_T
;
1129 tree base_inits
= NULL_TREE
;
1131 vec
<constructor_elt
, va_gc
> *init_vec
= NULL
;
1134 gcc_assert (tk_index
>= TK_FIXED
);
1136 vec_safe_grow (init_vec
, nbases
);
1137 /* Generate the base information initializer. */
1138 for (ix
= nbases
; ix
--;)
1140 tree base_binfo
= BINFO_BASE_BINFO (binfo
, ix
);
1145 vec
<constructor_elt
, va_gc
> *v
;
1147 if ((*base_accesses
)[ix
] == access_public_node
)
1149 tinfo
= get_tinfo_ptr (BINFO_TYPE (base_binfo
));
1150 if (BINFO_VIRTUAL_P (base_binfo
))
1152 /* We store the vtable offset at which the virtual
1153 base offset can be found. */
1154 offset
= BINFO_VPTR_FIELD (base_binfo
);
1158 offset
= BINFO_OFFSET (base_binfo
);
1160 /* Combine offset and flags into one field. */
1161 offset
= fold_convert (offset_type
, offset
);
1162 offset
= fold_build2_loc (input_location
,
1163 LSHIFT_EXPR
, offset_type
, offset
,
1164 build_int_cst (offset_type
, 8));
1165 offset
= fold_build2_loc (input_location
,
1166 BIT_IOR_EXPR
, offset_type
, offset
,
1167 build_int_cst (offset_type
, flags
));
1169 CONSTRUCTOR_APPEND_ELT (v
, NULL_TREE
, tinfo
);
1170 CONSTRUCTOR_APPEND_ELT (v
, NULL_TREE
, offset
);
1171 base_init
= build_constructor (init_list_type_node
, v
);
1172 e
= &(*init_vec
)[ix
];
1173 e
->index
= NULL_TREE
;
1174 e
->value
= base_init
;
1176 base_inits
= build_constructor (init_list_type_node
, init_vec
);
1178 /* get_tinfo_ptr might have reallocated the tinfo_descs vector. */
1179 ti
= &(*tinfo_descs
)[tk_index
];
1180 return class_initializer (ti
, type
, 3,
1181 build_int_cst (NULL_TREE
, hint
),
1182 build_int_cst (NULL_TREE
, nbases
),
1188 /* Generate the RECORD_TYPE containing the data layout of a type_info
1189 derivative as used by the runtime. This layout must be consistent with
1190 that defined in the runtime support. Also generate the VAR_DECL for the
1191 type's vtable. We explicitly manage the vtable member, and name it for
1192 real type as used in the runtime. The RECORD type has a different name,
1193 to avoid collisions. Return a TREE_LIST who's TINFO_PSEUDO_TYPE
1194 is the generated type and TINFO_VTABLE_NAME is the name of the
1195 vtable. We have to delay generating the VAR_DECL of the vtable
1196 until the end of the translation, when we'll have seen the library
1197 definition, if there was one.
1199 REAL_NAME is the runtime's name of the type. Trailing arguments are
1200 additional FIELD_DECL's for the structure. The final argument must be
1204 create_pseudo_type_info (int tk
, const char *real_name
, ...)
1213 va_start (ap
, real_name
);
1215 /* Generate the pseudo type name. */
1216 pseudo_name
= (char *) alloca (strlen (real_name
) + 30);
1217 strcpy (pseudo_name
, real_name
);
1218 strcat (pseudo_name
, "_pseudo");
1220 sprintf (pseudo_name
+ strlen (pseudo_name
), "%d", tk
- TK_FIXED
);
1222 /* First field is the pseudo type_info base class. */
1223 fields
= build_decl (input_location
,
1224 FIELD_DECL
, NULL_TREE
,
1225 (*tinfo_descs
)[TK_TYPE_INFO_TYPE
].type
);
1227 /* Now add the derived fields. */
1228 while ((field_decl
= va_arg (ap
, tree
)))
1230 DECL_CHAIN (field_decl
) = fields
;
1231 fields
= field_decl
;
1234 /* Create the pseudo type. */
1235 pseudo_type
= make_class_type (RECORD_TYPE
);
1236 finish_builtin_struct (pseudo_type
, pseudo_name
, fields
, NULL_TREE
);
1237 CLASSTYPE_AS_BASE (pseudo_type
) = pseudo_type
;
1239 ti
= &(*tinfo_descs
)[tk
];
1240 ti
->type
= cp_build_qualified_type (pseudo_type
, TYPE_QUAL_CONST
);
1241 ti
->name
= get_identifier (real_name
);
1242 ti
->vtable
= NULL_TREE
;
1244 /* Pretend this is public so determine_visibility doesn't give vtables
1245 internal linkage. */
1246 TREE_PUBLIC (TYPE_MAIN_DECL (ti
->type
)) = 1;
1251 /* Return the index of a pseudo type info type node used to describe
1252 TYPE. TYPE must be a complete type (or cv void), except at the end
1253 of the translation unit. */
1256 get_pseudo_ti_index (tree type
)
1260 switch (TREE_CODE (type
))
1263 ix
= TK_POINTER_MEMBER_TYPE
;
1267 ix
= TK_POINTER_TYPE
;
1271 ix
= TK_ENUMERAL_TYPE
;
1275 ix
= TK_FUNCTION_TYPE
;
1284 if (TYPE_PTRMEMFUNC_P (type
))
1286 ix
= TK_POINTER_MEMBER_TYPE
;
1289 else if (!COMPLETE_TYPE_P (type
))
1292 cxx_incomplete_type_error (NULL_TREE
, type
);
1296 else if (!BINFO_N_BASE_BINFOS (TYPE_BINFO (type
)))
1303 tree binfo
= TYPE_BINFO (type
);
1304 vec
<tree
, va_gc
> *base_accesses
= BINFO_BASE_ACCESSES (binfo
);
1305 tree base_binfo
= BINFO_BASE_BINFO (binfo
, 0);
1306 int num_bases
= BINFO_N_BASE_BINFOS (binfo
);
1309 && (*base_accesses
)[0] == access_public_node
1310 && !BINFO_VIRTUAL_P (base_binfo
)
1311 && integer_zerop (BINFO_OFFSET (base_binfo
)))
1313 /* single non-virtual public. */
1314 ix
= TK_SI_CLASS_TYPE
;
1320 tree array_domain
, base_array
;
1322 ix
= TK_FIXED
+ num_bases
;
1323 if (vec_safe_length (tinfo_descs
) <= ix
)
1325 /* too short, extend. */
1326 unsigned len
= vec_safe_length (tinfo_descs
);
1328 vec_safe_grow (tinfo_descs
, ix
+ 1);
1329 while (tinfo_descs
->iterate (len
++, &ti
))
1330 ti
->type
= ti
->vtable
= ti
->name
= NULL_TREE
;
1332 else if ((*tinfo_descs
)[ix
].type
)
1333 /* already created. */
1336 /* Create the array of __base_class_type_info entries. */
1337 array_domain
= build_index_type (size_int (num_bases
- 1));
1338 base_array
= build_array_type ((*tinfo_descs
)[TK_BASE_TYPE
].type
,
1341 push_abi_namespace ();
1342 create_pseudo_type_info
1343 (ix
, "__vmi_class_type_info",
1344 build_decl (input_location
,
1345 FIELD_DECL
, NULL_TREE
, integer_type_node
),
1346 build_decl (input_location
,
1347 FIELD_DECL
, NULL_TREE
, integer_type_node
),
1348 build_decl (input_location
,
1349 FIELD_DECL
, NULL_TREE
, base_array
),
1351 pop_abi_namespace ();
1356 ix
= TK_BUILTIN_TYPE
;
1362 /* Make sure the required builtin types exist for generating the type_info
1363 variable definitions. */
1366 create_tinfo_types (void)
1370 gcc_assert (!tinfo_descs
);
1372 vec_safe_grow (tinfo_descs
, TK_FIXED
);
1374 push_abi_namespace ();
1376 /* Create the internal type_info structure. This is used as a base for
1377 the other structures. */
1381 field
= build_decl (BUILTINS_LOCATION
,
1382 FIELD_DECL
, NULL_TREE
, const_ptr_type_node
);
1385 field
= build_decl (BUILTINS_LOCATION
,
1386 FIELD_DECL
, NULL_TREE
, const_string_type_node
);
1387 DECL_CHAIN (field
) = fields
;
1390 ti
= &(*tinfo_descs
)[TK_TYPE_INFO_TYPE
];
1391 ti
->type
= make_class_type (RECORD_TYPE
);
1392 ti
->vtable
= NULL_TREE
;
1393 ti
->name
= NULL_TREE
;
1394 finish_builtin_struct (ti
->type
, "__type_info_pseudo",
1398 /* Fundamental type_info */
1399 create_pseudo_type_info (TK_BUILTIN_TYPE
, "__fundamental_type_info", NULL
);
1401 /* Array, function and enum type_info. No additional fields. */
1402 create_pseudo_type_info (TK_ARRAY_TYPE
, "__array_type_info", NULL
);
1403 create_pseudo_type_info (TK_FUNCTION_TYPE
, "__function_type_info", NULL
);
1404 create_pseudo_type_info (TK_ENUMERAL_TYPE
, "__enum_type_info", NULL
);
1406 /* Class type_info. No additional fields. */
1407 create_pseudo_type_info (TK_CLASS_TYPE
, "__class_type_info", NULL
);
1409 /* Single public non-virtual base class. Add pointer to base class.
1410 This is really a descendant of __class_type_info. */
1411 create_pseudo_type_info (TK_SI_CLASS_TYPE
, "__si_class_type_info",
1412 build_decl (BUILTINS_LOCATION
,
1413 FIELD_DECL
, NULL_TREE
, type_info_ptr_type
),
1416 /* Base class internal helper. Pointer to base type, offset to base,
1421 field
= build_decl (BUILTINS_LOCATION
,
1422 FIELD_DECL
, NULL_TREE
, type_info_ptr_type
);
1425 field
= build_decl (BUILTINS_LOCATION
,
1426 FIELD_DECL
, NULL_TREE
, LONGPTR_T
);
1427 DECL_CHAIN (field
) = fields
;
1430 ti
= &(*tinfo_descs
)[TK_BASE_TYPE
];
1432 ti
->type
= make_class_type (RECORD_TYPE
);
1433 ti
->vtable
= NULL_TREE
;
1434 ti
->name
= NULL_TREE
;
1435 finish_builtin_struct (ti
->type
, "__base_class_type_info_pseudo",
1439 /* Pointer type_info. Adds two fields, qualification mask
1440 and pointer to the pointed to type. This is really a descendant of
1441 __pbase_type_info. */
1442 create_pseudo_type_info (TK_POINTER_TYPE
, "__pointer_type_info",
1443 build_decl (BUILTINS_LOCATION
,
1444 FIELD_DECL
, NULL_TREE
, integer_type_node
),
1445 build_decl (BUILTINS_LOCATION
,
1446 FIELD_DECL
, NULL_TREE
, type_info_ptr_type
),
1449 /* Pointer to member data type_info. Add qualifications flags,
1450 pointer to the member's type info and pointer to the class.
1451 This is really a descendant of __pbase_type_info. */
1452 create_pseudo_type_info (TK_POINTER_MEMBER_TYPE
,
1453 "__pointer_to_member_type_info",
1454 build_decl (BUILTINS_LOCATION
,
1455 FIELD_DECL
, NULL_TREE
, integer_type_node
),
1456 build_decl (BUILTINS_LOCATION
,
1457 FIELD_DECL
, NULL_TREE
, type_info_ptr_type
),
1458 build_decl (BUILTINS_LOCATION
,
1459 FIELD_DECL
, NULL_TREE
, type_info_ptr_type
),
1462 pop_abi_namespace ();
1465 /* Helper for emit_support_tinfos. Emits the type_info descriptor of
1469 emit_support_tinfo_1 (tree bltn
)
1473 if (bltn
== NULL_TREE
)
1476 types
[1] = build_pointer_type (bltn
);
1477 types
[2] = build_pointer_type (cp_build_qualified_type (bltn
,
1480 for (int i
= 0; i
< 3; ++i
)
1482 tree tinfo
= get_tinfo_decl (types
[i
]);
1483 TREE_USED (tinfo
) = 1;
1484 mark_needed (tinfo
);
1485 /* The C++ ABI requires that these objects be COMDAT. But,
1486 On systems without weak symbols, initialized COMDAT
1487 objects are emitted with internal linkage. (See
1488 comdat_linkage for details.) Since we want these objects
1489 to have external linkage so that copies do not have to be
1490 emitted in code outside the runtime library, we make them
1493 It might also not be necessary to follow this detail of the
1495 if (!flag_weak
|| ! targetm
.cxx
.library_rtti_comdat ())
1497 gcc_assert (TREE_PUBLIC (tinfo
) && !DECL_COMDAT (tinfo
));
1498 DECL_INTERFACE_KNOWN (tinfo
) = 1;
1503 /* Emit the type_info descriptors which are guaranteed to be in the runtime
1504 support. Generating them here guarantees consistency with the other
1505 structures. We use the following heuristic to determine when the runtime
1506 is being generated. If std::__fundamental_type_info is defined, and its
1507 destructor is defined, then the runtime is being built. */
1510 emit_support_tinfos (void)
1512 /* Dummy static variable so we can put nullptr in the array; it will be
1513 set before we actually start to walk the array. */
1514 static tree
*const fundamentals
[] =
1518 &wchar_type_node
, &char16_type_node
, &char32_type_node
,
1519 &char_type_node
, &signed_char_type_node
, &unsigned_char_type_node
,
1520 &short_integer_type_node
, &short_unsigned_type_node
,
1521 &integer_type_node
, &unsigned_type_node
,
1522 &long_integer_type_node
, &long_unsigned_type_node
,
1523 &long_long_integer_type_node
, &long_long_unsigned_type_node
,
1524 &float_type_node
, &double_type_node
, &long_double_type_node
,
1525 &dfloat32_type_node
, &dfloat64_type_node
, &dfloat128_type_node
,
1530 tree bltn_type
, dtor
;
1532 push_abi_namespace ();
1533 bltn_type
= xref_tag (class_type
,
1534 get_identifier ("__fundamental_type_info"),
1535 /*tag_scope=*/ts_current
, false);
1536 pop_abi_namespace ();
1537 if (!COMPLETE_TYPE_P (bltn_type
))
1539 dtor
= CLASSTYPE_DESTRUCTORS (bltn_type
);
1540 if (!dtor
|| DECL_EXTERNAL (dtor
))
1543 for (ix
= 0; fundamentals
[ix
]; ix
++)
1544 emit_support_tinfo_1 (*fundamentals
[ix
]);
1545 for (ix
= 0; ix
< NUM_INT_N_ENTS
; ix
++)
1546 if (int_n_enabled_p
[ix
])
1548 emit_support_tinfo_1 (int_n_trees
[ix
].signed_type
);
1549 emit_support_tinfo_1 (int_n_trees
[ix
].unsigned_type
);
1551 for (tree t
= registered_builtin_types
; t
; t
= TREE_CHAIN (t
))
1552 emit_support_tinfo_1 (TREE_VALUE (t
));
1555 /* Finish a type info decl. DECL_PTR is a pointer to an unemitted
1556 tinfo decl. Determine whether it needs emitting, and if so
1557 generate the initializer. */
1560 emit_tinfo_decl (tree decl
)
1562 tree type
= TREE_TYPE (DECL_NAME (decl
));
1563 int in_library
= typeinfo_in_lib_p (type
);
1565 gcc_assert (DECL_TINFO_P (decl
));
1570 DECL_EXTERNAL (decl
) = 0;
1573 /* If we're not in the runtime, then DECL (which is already
1574 DECL_EXTERNAL) will not be defined here. */
1575 DECL_INTERFACE_KNOWN (decl
) = 1;
1579 else if (involves_incomplete_p (type
))
1581 if (!decl_needed_p (decl
))
1583 /* If TYPE involves an incomplete class type, then the typeinfo
1584 object will be emitted with internal linkage. There is no
1585 way to know whether or not types are incomplete until the end
1586 of the compilation, so this determination must be deferred
1587 until this point. */
1588 TREE_PUBLIC (decl
) = 0;
1589 DECL_EXTERNAL (decl
) = 0;
1590 DECL_INTERFACE_KNOWN (decl
) = 1;
1593 import_export_decl (decl
);
1594 if (DECL_NOT_REALLY_EXTERN (decl
) && decl_needed_p (decl
))
1598 DECL_EXTERNAL (decl
) = 0;
1599 init
= get_pseudo_ti_init (type
, get_pseudo_ti_index (type
));
1600 DECL_INITIAL (decl
) = init
;
1602 cp_finish_decl (decl
, init
, false, NULL_TREE
, 0);
1603 /* Avoid targets optionally bumping up the alignment to improve
1604 vector instruction accesses, tinfo are never accessed this way. */
1605 #ifdef DATA_ABI_ALIGNMENT
1606 DECL_ALIGN (decl
) = DATA_ABI_ALIGNMENT (decl
, TYPE_ALIGN (TREE_TYPE (decl
)));
1607 DECL_USER_ALIGN (decl
) = true;
1615 #include "gt-cp-rtti.h"