1 /* RunTime Type Identification
2 Copyright (C) 1995-2019 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/>. */
23 #include "coretypes.h"
28 #include "stringpool.h"
30 #include "stor-layout.h"
31 #include "c-family/c-pragma.h"
32 #include "gcc-rich-location.h"
34 /* C++ returns type information to the user in struct type_info
35 objects. We also use type information to implement dynamic_cast and
36 exception handlers. Type information for a particular type is
37 indicated with an ABI defined structure derived from type_info.
38 This would all be very straight forward, but for the fact that the
39 runtime library provides the definitions of the type_info structure
40 and the ABI defined derived classes. We cannot build declarations
41 of them directly in the compiler, but we need to layout objects of
42 their type. Somewhere we have to lie.
44 We define layout compatible POD-structs with compiler-defined names
45 and generate the appropriate initializations for them (complete
46 with explicit mention of their vtable). When we have to provide a
47 type_info to the user we reinterpret_cast the internal compiler
48 type to type_info. A well formed program can only explicitly refer
49 to the type_infos of complete types (& cv void). However, we chain
50 pointer type_infos to the pointed-to-type, and that can be
51 incomplete. We only need the addresses of such incomplete
52 type_info objects for static initialization.
54 The type information VAR_DECL of a type is held on the
55 get_global_binding of the type's mangled name. That VAR_DECL
56 will be the internal type. It will usually have the correct
57 internal type reflecting the kind of type it represents (pointer,
58 array, function, class, inherited class, etc). When the type it
59 represents is incomplete, it will have the internal type
60 corresponding to type_info. That will only happen at the end of
61 translation, when we are emitting the type info objects. */
63 /* Auxiliary data we hold for each type_info derived object we need. */
64 struct GTY (()) tinfo_s
{
65 tree type
; /* The RECORD_TYPE for this type_info object */
67 tree vtable
; /* The VAR_DECL of the vtable. Only filled at end of
70 tree name
; /* IDENTIFIER_NODE for the ABI specified name of
71 the type_info derived type. */
77 TK_TYPE_INFO_TYPE
, /* abi::__type_info_pseudo */
78 TK_BASE_TYPE
, /* abi::__base_class_type_info */
79 TK_DERIVED_TYPES
, /* Start of types derived from abi::__type_info */
80 TK_BUILTIN_TYPE
= TK_DERIVED_TYPES
, /* abi::__fundamental_type_info */
81 TK_ARRAY_TYPE
, /* abi::__array_type_info */
82 TK_FUNCTION_TYPE
, /* abi::__function_type_info */
83 TK_ENUMERAL_TYPE
, /* abi::__enum_type_info */
84 TK_POINTER_TYPE
, /* abi::__pointer_type_info */
85 TK_POINTER_MEMBER_TYPE
, /* abi::__pointer_to_member_type_info */
86 TK_CLASS_TYPE
, /* abi::__class_type_info */
87 TK_SI_CLASS_TYPE
, /* abi::__si_class_type_info */
88 TK_VMI_CLASS_TYPES
, /* abi::__vmi_class_type_info<int> */
92 /* Names of the tinfo types. Must be same order as TK enumeration
95 static const char *const tinfo_names
[TK_MAX
] =
98 "__base_class_type_info",
99 "__fundamental_type_info",
101 "__function_type_info",
103 "__pointer_type_info",
104 "__pointer_to_member_type_info",
106 "__si_class_type_info",
107 "__vmi_class_type_info"
110 /* Helper macro to get maximum scalar-width of pointer or of the 'long'-type.
111 This of interest for llp64 targets. */
113 integer_types[(POINTER_SIZE <= TYPE_PRECISION (integer_types[itk_long]) \
114 ? itk_long : itk_long_long)]
116 /* A vector of all tinfo decls that haven't yet been emitted. */
117 vec
<tree
, va_gc
> *unemitted_tinfo_decls
;
119 /* A vector of all type_info derived types we need. The first few are
120 fixed and created early. The remainder are for multiple inheritance
121 and are generated as needed. */
122 static GTY (()) vec
<tinfo_s
, va_gc
> *tinfo_descs
;
124 static tree
ifnonnull (tree
, tree
, tsubst_flags_t
);
125 static tree
tinfo_name (tree
, bool);
126 static tree
build_dynamic_cast_1 (tree
, tree
, tsubst_flags_t
);
127 static tree
throw_bad_cast (void);
128 static tree
throw_bad_typeid (void);
129 static tree
get_tinfo_ptr (tree
);
130 static bool typeid_ok_p (void);
131 static int qualifier_flags (tree
);
132 static bool target_incomplete_p (tree
);
133 static tree
tinfo_base_init (tinfo_s
*, tree
);
134 static tree
generic_initializer (tinfo_s
*, tree
);
135 static tree
ptr_initializer (tinfo_s
*, tree
);
136 static tree
ptm_initializer (tinfo_s
*, tree
);
137 static tree
class_initializer (tinfo_s
*, tree
, unsigned, ...);
138 static tree
get_pseudo_ti_init (tree
, unsigned);
139 static unsigned get_pseudo_ti_index (tree
);
140 static tinfo_s
*get_tinfo_desc (unsigned);
141 static void create_tinfo_types (void);
142 static bool typeinfo_in_lib_p (tree
);
144 static int doing_runtime
= 0;
147 push_abi_namespace (void)
149 push_nested_namespace (abi_node
);
150 push_visibility ("default", 2);
154 pop_abi_namespace (void)
157 pop_nested_namespace (abi_node
);
160 /* Declare language defined type_info type and a pointer to const
161 type_info. This is incomplete here, and will be completed when
162 the user #includes <typeinfo>. There are language defined
163 restrictions on what can be done until that is included. Create
164 the internal versions of the ABI types. */
167 init_rtti_processing (void)
171 push_nested_namespace (std_node
);
172 type_info_type
= xref_tag (class_type
, get_identifier ("type_info"),
173 /*tag_scope=*/ts_current
, false);
174 pop_nested_namespace (std_node
);
175 const_type_info_type_node
176 = cp_build_qualified_type (type_info_type
, TYPE_QUAL_CONST
);
177 type_info_ptr_type
= build_pointer_type (const_type_info_type_node
);
179 vec_alloc (unemitted_tinfo_decls
, 124);
181 create_tinfo_types ();
184 /* Given the expression EXP of type `class *', return the head of the
185 object pointed to by EXP with type cv void*, if the class has any
186 virtual functions (TYPE_POLYMORPHIC_P), else just return the
190 build_headof (tree exp
)
192 tree type
= TREE_TYPE (exp
);
196 gcc_assert (TYPE_PTR_P (type
));
197 type
= TREE_TYPE (type
);
199 if (!TYPE_POLYMORPHIC_P (type
))
202 /* We use this a couple of times below, protect it. */
203 exp
= save_expr (exp
);
205 /* The offset-to-top field is at index -2 from the vptr. */
206 index
= build_int_cst (NULL_TREE
,
207 -2 * TARGET_VTABLE_DATA_ENTRY_DISTANCE
);
209 offset
= build_vtbl_ref (cp_build_fold_indirect_ref (exp
),
212 cp_build_qualified_type (ptr_type_node
,
213 cp_type_quals (TREE_TYPE (exp
)));
214 return fold_build_pointer_plus (exp
, offset
);
217 /* Get a bad_cast node for the program to throw...
219 See libstdc++/exception.cc for __throw_bad_cast */
222 throw_bad_cast (void)
227 tree name
= get_identifier ("__cxa_bad_cast");
228 fn
= get_global_binding (name
);
230 fn
= push_throw_library_fn
231 (name
, build_function_type_list (ptr_type_node
, NULL_TREE
));
234 return build_cxx_call (fn
, 0, NULL
, tf_warning_or_error
);
237 /* Return an expression for "__cxa_bad_typeid()". The expression
238 returned is an lvalue of type "const std::type_info". */
241 throw_bad_typeid (void)
246 tree name
= get_identifier ("__cxa_bad_typeid");
247 fn
= get_global_binding (name
);
250 tree t
= build_reference_type (const_type_info_type_node
);
251 t
= build_function_type_list (t
, NULL_TREE
);
252 fn
= push_throw_library_fn (name
, t
);
256 return build_cxx_call (fn
, 0, NULL
, tf_warning_or_error
);
259 /* Return an lvalue expression whose type is "const std::type_info"
260 and whose value indicates the type of the expression EXP. If EXP
261 is a reference to a polymorphic class, return the dynamic type;
262 otherwise return the static type of the expression. */
265 get_tinfo_decl_dynamic (tree exp
, tsubst_flags_t complain
)
270 if (error_operand_p (exp
))
271 return error_mark_node
;
273 exp
= resolve_nondeduced_context (exp
, complain
);
275 /* Peel back references, so they match. */
276 type
= non_reference (unlowered_expr_type (exp
));
278 /* Peel off cv qualifiers. */
279 type
= cv_unqualified (type
);
281 /* For UNKNOWN_TYPEs call complete_type_or_else to get diagnostics. */
282 if (CLASS_TYPE_P (type
) || type
== unknown_type_node
283 || type
== init_list_type_node
)
284 type
= complete_type_or_maybe_complain (type
, exp
, complain
);
287 return error_mark_node
;
289 /* If exp is a reference to polymorphic type, get the real type_info. */
290 if (TYPE_POLYMORPHIC_P (type
) && ! resolves_to_fixed_type_p (exp
, 0))
292 /* build reference to type_info from vtable. */
295 /* The RTTI information is at index -1. */
296 index
= build_int_cst (NULL_TREE
,
297 -1 * TARGET_VTABLE_DATA_ENTRY_DISTANCE
);
298 t
= build_vtbl_ref (exp
, index
);
299 t
= convert (type_info_ptr_type
, t
);
302 /* Otherwise return the type_info for the static type of the expr. */
303 t
= get_tinfo_ptr (type
);
305 return cp_build_fold_indirect_ref (t
);
313 error ("cannot use %<typeid%> with %<-fno-rtti%>");
317 if (!COMPLETE_TYPE_P (const_type_info_type_node
))
319 gcc_rich_location
richloc (input_location
);
320 maybe_add_include_fixit (&richloc
, "<typeinfo>", false);
322 "must %<#include <typeinfo>%> before using"
328 tree pseudo
= TYPE_MAIN_VARIANT (get_tinfo_desc (TK_TYPE_INFO_TYPE
)->type
);
329 tree real
= TYPE_MAIN_VARIANT (const_type_info_type_node
);
331 /* Make sure abi::__type_info_pseudo has the same alias set
332 as std::type_info. */
333 if (! TYPE_ALIAS_SET_KNOWN_P (pseudo
))
334 TYPE_ALIAS_SET (pseudo
) = get_alias_set (real
);
336 gcc_assert (TYPE_ALIAS_SET (pseudo
) == get_alias_set (real
));
341 /* Return an expression for "typeid(EXP)". The expression returned is
342 an lvalue of type "const std::type_info". */
345 build_typeid (tree exp
, tsubst_flags_t complain
)
347 tree cond
= NULL_TREE
, initial_expr
= exp
;
350 if (exp
== error_mark_node
|| !typeid_ok_p ())
351 return error_mark_node
;
353 if (processing_template_decl
)
354 return build_min (TYPEID_EXPR
, const_type_info_type_node
, exp
);
356 /* FIXME when integrating with c_fully_fold, mark
357 resolves_to_fixed_type_p case as a non-constant expression. */
358 if (TYPE_POLYMORPHIC_P (TREE_TYPE (exp
))
359 && ! resolves_to_fixed_type_p (exp
, &nonnull
)
362 /* So we need to look into the vtable of the type of exp.
363 Make sure it isn't a null lvalue. */
364 exp
= cp_build_addr_expr (exp
, complain
);
365 exp
= save_expr (exp
);
366 cond
= cp_convert (boolean_type_node
, exp
, complain
);
367 exp
= cp_build_fold_indirect_ref (exp
);
370 exp
= get_tinfo_decl_dynamic (exp
, complain
);
372 if (exp
== error_mark_node
)
373 return error_mark_node
;
377 tree bad
= throw_bad_typeid ();
379 exp
= build3 (COND_EXPR
, TREE_TYPE (exp
), cond
, exp
, bad
);
382 mark_type_use (initial_expr
);
387 /* Generate the NTBS name of a type. If MARK_PRIVATE, put a '*' in front so that
388 comparisons will be done by pointer rather than string comparison. */
390 tinfo_name (tree type
, bool mark_private
)
396 name
= mangle_type_string (type
);
397 length
= strlen (name
);
401 /* Inject '*' at beginning of name to force pointer comparison. */
402 char* buf
= (char*) XALLOCAVEC (char, length
+ 2);
404 memcpy (buf
+ 1, name
, length
+ 1);
405 name_string
= build_string (length
+ 2, buf
);
408 name_string
= build_string (length
+ 1, name
);
410 return fix_string_type (name_string
);
413 /* Return a VAR_DECL for the internal ABI defined type_info object for
414 TYPE. You must arrange that the decl is mark_used, if actually use
415 it --- decls in vtables are only used if the vtable is output. */
418 get_tinfo_decl (tree type
)
423 if (variably_modified_type_p (type
, /*fn=*/NULL_TREE
))
425 error ("cannot create type information for type %qT because "
426 "it involves types of variable size",
428 return error_mark_node
;
431 if (TREE_CODE (type
) == METHOD_TYPE
)
432 type
= build_function_type (TREE_TYPE (type
),
433 TREE_CHAIN (TYPE_ARG_TYPES (type
)));
435 type
= complete_type (type
);
437 /* For a class type, the variable is cached in the type node
439 if (CLASS_TYPE_P (type
))
441 d
= CLASSTYPE_TYPEINFO_VAR (TYPE_MAIN_VARIANT (type
));
446 name
= mangle_typeinfo_for_type (type
);
448 d
= get_global_binding (name
);
451 int ix
= get_pseudo_ti_index (type
);
452 const tinfo_s
*ti
= get_tinfo_desc (ix
);
454 d
= build_lang_decl (VAR_DECL
, name
, ti
->type
);
455 SET_DECL_ASSEMBLER_NAME (d
, name
);
456 /* Remember the type it is for. */
457 TREE_TYPE (name
) = type
;
458 DECL_TINFO_P (d
) = 1;
459 DECL_ARTIFICIAL (d
) = 1;
460 DECL_IGNORED_P (d
) = 1;
461 TREE_READONLY (d
) = 1;
463 /* Mark the variable as undefined -- but remember that we can
464 define it later if we need to do so. */
465 DECL_EXTERNAL (d
) = 1;
466 DECL_NOT_REALLY_EXTERN (d
) = 1;
467 set_linkage_according_to_type (type
, d
);
469 d
= pushdecl_top_level_and_finish (d
, NULL_TREE
);
470 if (CLASS_TYPE_P (type
))
471 CLASSTYPE_TYPEINFO_VAR (TYPE_MAIN_VARIANT (type
)) = d
;
473 /* Add decl to the global array of tinfo decls. */
474 vec_safe_push (unemitted_tinfo_decls
, d
);
480 /* Return a pointer to a type_info object describing TYPE, suitably
481 cast to the language defined type. */
484 get_tinfo_ptr (tree type
)
486 tree decl
= get_tinfo_decl (type
);
489 return build_nop (type_info_ptr_type
,
490 build_address (decl
));
493 /* Return the type_info object for TYPE. */
496 get_typeid (tree type
, tsubst_flags_t complain
)
498 if (type
== error_mark_node
|| !typeid_ok_p ())
499 return error_mark_node
;
501 if (processing_template_decl
)
502 return build_min (TYPEID_EXPR
, const_type_info_type_node
, type
);
504 /* If the type of the type-id is a reference type, the result of the
505 typeid expression refers to a type_info object representing the
507 type
= non_reference (type
);
509 /* This is not one of the uses of a qualified function type in 8.3.5. */
510 if (TREE_CODE (type
) == FUNCTION_TYPE
511 && (type_memfn_quals (type
) != TYPE_UNQUALIFIED
512 || type_memfn_rqual (type
) != REF_QUAL_NONE
))
514 if (complain
& tf_error
)
515 error ("%<typeid%> of qualified function type %qT", type
);
516 return error_mark_node
;
519 /* The top-level cv-qualifiers of the lvalue expression or the type-id
520 that is the operand of typeid are always ignored. */
521 type
= cv_unqualified (type
);
523 /* For UNKNOWN_TYPEs call complete_type_or_else to get diagnostics. */
524 if (CLASS_TYPE_P (type
) || type
== unknown_type_node
525 || type
== init_list_type_node
)
526 type
= complete_type_or_maybe_complain (type
, NULL_TREE
, complain
);
529 return error_mark_node
;
531 return cp_build_fold_indirect_ref (get_tinfo_ptr (type
));
534 /* Check whether TEST is null before returning RESULT. If TEST is used in
535 RESULT, it must have previously had a save_expr applied to it. */
538 ifnonnull (tree test
, tree result
, tsubst_flags_t complain
)
540 tree cond
= build2 (NE_EXPR
, boolean_type_node
, test
,
541 cp_convert (TREE_TYPE (test
), nullptr_node
, complain
));
542 /* This is a compiler generated comparison, don't emit
543 e.g. -Wnonnull-compare warning for it. */
544 TREE_NO_WARNING (cond
) = 1;
545 return build3 (COND_EXPR
, TREE_TYPE (result
), cond
, result
,
546 cp_convert (TREE_TYPE (result
), nullptr_node
, complain
));
549 /* Execute a dynamic cast, as described in section 5.2.6 of the 9/93 working
553 build_dynamic_cast_1 (tree type
, tree expr
, tsubst_flags_t complain
)
555 enum tree_code tc
= TREE_CODE (type
);
558 tree old_expr
= expr
;
559 const char *errstr
= NULL
;
561 /* Save casted types in the function's used types hash table. */
562 used_types_insert (type
);
564 /* T shall be a pointer or reference to a complete class type, or
565 `pointer to cv void''. */
569 if (VOID_TYPE_P (TREE_TYPE (type
)))
573 if (! MAYBE_CLASS_TYPE_P (TREE_TYPE (type
)))
575 errstr
= _("target is not pointer or reference to class");
578 if (!COMPLETE_TYPE_P (complete_type (TREE_TYPE (type
))))
580 errstr
= _("target is not pointer or reference to complete type");
586 errstr
= _("target is not pointer or reference");
590 if (tc
== POINTER_TYPE
)
592 expr
= decay_conversion (expr
, complain
);
593 exprtype
= TREE_TYPE (expr
);
595 /* If T is a pointer type, v shall be an rvalue of a pointer to
596 complete class type, and the result is an rvalue of type T. */
598 expr
= mark_rvalue_use (expr
);
600 if (!TYPE_PTR_P (exprtype
))
602 errstr
= _("source is not a pointer");
605 if (! MAYBE_CLASS_TYPE_P (TREE_TYPE (exprtype
)))
607 errstr
= _("source is not a pointer to class");
610 if (!COMPLETE_TYPE_P (complete_type (TREE_TYPE (exprtype
))))
612 errstr
= _("source is a pointer to incomplete type");
618 expr
= mark_lvalue_use (expr
);
619 exprtype
= TREE_TYPE (expr
);
621 /* T is a reference type, v shall be an lvalue of a complete class
622 type, and the result is an lvalue of the type referred to by T. */
623 if (! MAYBE_CLASS_TYPE_P (exprtype
))
625 errstr
= _("source is not of class type");
628 if (!COMPLETE_TYPE_P (complete_type (exprtype
)))
630 errstr
= _("source is of incomplete class type");
634 exprtype
= cp_build_reference_type (exprtype
, !lvalue_p (expr
));
637 /* The dynamic_cast operator shall not cast away constness. */
638 if (!at_least_as_qualified_p (TREE_TYPE (type
),
639 TREE_TYPE (exprtype
)))
641 errstr
= _("conversion casts away constness");
645 /* If *type is an unambiguous accessible base class of *exprtype,
646 convert statically. */
648 tree binfo
= lookup_base (TREE_TYPE (exprtype
), TREE_TYPE (type
),
649 ba_check
, NULL
, complain
);
651 return build_static_cast (type
, expr
, complain
);
654 /* Apply trivial conversion T -> T& for dereferenced ptrs. */
655 if (tc
== REFERENCE_TYPE
)
656 expr
= convert_to_reference (exprtype
, expr
, CONV_IMPLICIT
,
657 LOOKUP_NORMAL
, NULL_TREE
, complain
);
659 /* Otherwise *exprtype must be a polymorphic class (have a vtbl). */
660 if (TYPE_POLYMORPHIC_P (TREE_TYPE (exprtype
)))
663 /* if TYPE is `void *', return pointer to complete object. */
664 if (tc
== POINTER_TYPE
&& VOID_TYPE_P (TREE_TYPE (type
)))
666 /* if b is an object, dynamic_cast<void *>(&b) == (void *)&b. */
667 if (TREE_CODE (expr
) == ADDR_EXPR
668 && VAR_P (TREE_OPERAND (expr
, 0))
669 && TREE_CODE (TREE_TYPE (TREE_OPERAND (expr
, 0))) == RECORD_TYPE
)
670 return build1 (NOP_EXPR
, type
, expr
);
672 /* Since expr is used twice below, save it. */
673 expr
= save_expr (expr
);
675 expr1
= build_headof (expr
);
676 if (TREE_TYPE (expr1
) != type
)
677 expr1
= build1 (NOP_EXPR
, type
, expr1
);
678 return ifnonnull (expr
, expr1
, complain
);
683 tree result
, td2
, td3
;
685 tree static_type
, target_type
, boff
;
687 /* If we got here, we can't convert statically. Therefore,
688 dynamic_cast<D&>(b) (b an object) cannot succeed. */
689 if (tc
== REFERENCE_TYPE
)
692 && TREE_CODE (TREE_TYPE (old_expr
)) == RECORD_TYPE
)
694 tree expr
= throw_bad_cast ();
695 if (complain
& tf_warning
)
696 warning (0, "%<dynamic_cast<%#T>(%#D)%> can never succeed",
698 /* Bash it to the expected type. */
699 TREE_TYPE (expr
) = type
;
703 /* Ditto for dynamic_cast<D*>(&b). */
704 else if (TREE_CODE (expr
) == ADDR_EXPR
)
706 tree op
= TREE_OPERAND (expr
, 0);
708 && TREE_CODE (TREE_TYPE (op
)) == RECORD_TYPE
)
710 if (complain
& tf_warning
)
711 warning (0, "%<dynamic_cast<%#T>(%#D)%> can never succeed",
713 retval
= build_int_cst (type
, 0);
718 /* Use of dynamic_cast when -fno-rtti is prohibited. */
721 if (complain
& tf_error
)
722 error ("%<dynamic_cast%> not permitted with %<-fno-rtti%>");
723 return error_mark_node
;
726 target_type
= TYPE_MAIN_VARIANT (TREE_TYPE (type
));
727 static_type
= TYPE_MAIN_VARIANT (TREE_TYPE (exprtype
));
728 td2
= get_tinfo_decl (target_type
);
729 if (!mark_used (td2
, complain
) && !(complain
& tf_error
))
730 return error_mark_node
;
731 td2
= cp_build_addr_expr (td2
, complain
);
732 td3
= get_tinfo_decl (static_type
);
733 if (!mark_used (td3
, complain
) && !(complain
& tf_error
))
734 return error_mark_node
;
735 td3
= cp_build_addr_expr (td3
, complain
);
737 /* Determine how T and V are related. */
738 boff
= dcast_base_hint (static_type
, target_type
);
740 /* Since expr is used twice below, save it. */
741 expr
= save_expr (expr
);
744 if (tc
== REFERENCE_TYPE
)
745 expr1
= cp_build_addr_expr (expr1
, complain
);
752 dcast_fn
= dynamic_cast_node
;
759 push_abi_namespace ();
760 tinfo_ptr
= xref_tag (class_type
,
761 get_identifier ("__class_type_info"),
762 /*tag_scope=*/ts_current
, false);
764 tinfo_ptr
= build_pointer_type
765 (cp_build_qualified_type
766 (tinfo_ptr
, TYPE_QUAL_CONST
));
767 name
= "__dynamic_cast";
768 tmp
= build_function_type_list (ptr_type_node
,
770 tinfo_ptr
, tinfo_ptr
,
771 ptrdiff_type_node
, NULL_TREE
);
772 dcast_fn
= build_library_fn_ptr (name
, tmp
,
773 ECF_LEAF
| ECF_PURE
| ECF_NOTHROW
);
774 pop_abi_namespace ();
775 dynamic_cast_node
= dcast_fn
;
777 result
= build_cxx_call (dcast_fn
, 4, elems
, complain
);
779 if (tc
== REFERENCE_TYPE
)
781 tree bad
= throw_bad_cast ();
784 result
= save_expr (result
);
785 neq
= cp_truthvalue_conversion (result
, complain
);
786 return cp_convert (type
,
787 build3 (COND_EXPR
, TREE_TYPE (result
),
788 neq
, result
, bad
), complain
);
791 /* Now back to the type we want from a void*. */
792 result
= cp_convert (type
, result
, complain
);
793 return ifnonnull (expr
, result
, complain
);
797 errstr
= _("source type is not polymorphic");
800 if (complain
& tf_error
)
801 error ("cannot %<dynamic_cast%> %qE (of type %q#T) to type %q#T (%s)",
802 old_expr
, TREE_TYPE (old_expr
), type
, errstr
);
803 return error_mark_node
;
807 build_dynamic_cast (tree type
, tree expr
, tsubst_flags_t complain
)
811 if (type
== error_mark_node
|| expr
== error_mark_node
)
812 return error_mark_node
;
814 if (processing_template_decl
)
816 expr
= build_min (DYNAMIC_CAST_EXPR
, type
, expr
);
817 TREE_SIDE_EFFECTS (expr
) = 1;
818 return convert_from_reference (expr
);
821 r
= convert_from_reference (build_dynamic_cast_1 (type
, expr
, complain
));
822 if (r
!= error_mark_node
)
823 maybe_warn_about_useless_cast (type
, expr
, complain
);
827 /* Return the runtime bit mask encoding the qualifiers of TYPE. */
830 qualifier_flags (tree type
)
833 int quals
= cp_type_quals (type
);
835 if (quals
& TYPE_QUAL_CONST
)
837 if (quals
& TYPE_QUAL_VOLATILE
)
839 if (quals
& TYPE_QUAL_RESTRICT
)
844 /* Return true, if the pointer chain TYPE ends at an incomplete type, or
845 contains a pointer to member of an incomplete class. */
848 target_incomplete_p (tree type
)
851 if (TYPE_PTRDATAMEM_P (type
))
853 if (!COMPLETE_TYPE_P (TYPE_PTRMEM_CLASS_TYPE (type
)))
855 type
= TYPE_PTRMEM_POINTED_TO_TYPE (type
);
857 else if (TYPE_PTR_P (type
))
858 type
= TREE_TYPE (type
);
860 return !COMPLETE_OR_VOID_TYPE_P (type
);
863 /* Returns true if TYPE involves an incomplete class type; in that
864 case, typeinfo variables for TYPE should be emitted with internal
868 involves_incomplete_p (tree type
)
870 switch (TREE_CODE (type
))
873 return target_incomplete_p (TREE_TYPE (type
));
878 (target_incomplete_p (TYPE_PTRMEM_POINTED_TO_TYPE (type
))
879 || !COMPLETE_TYPE_P (TYPE_PTRMEM_CLASS_TYPE (type
)));
882 if (TYPE_PTRMEMFUNC_P (type
))
886 if (!COMPLETE_TYPE_P (type
))
890 /* All other types do not involve incomplete class types. */
895 /* Return a CONSTRUCTOR for the common part of the type_info objects. This
896 is the vtable pointer and NTBS name. The NTBS name is emitted as a
897 comdat const char array, so it becomes a unique key for the type. Generate
898 and emit that VAR_DECL here. (We can't always emit the type_info itself
899 as comdat, because of pointers to incomplete.) */
902 tinfo_base_init (tinfo_s
*ti
, tree target
)
907 vec
<constructor_elt
, va_gc
> *v
;
910 tree name_name
, name_string
;
912 /* Generate the NTBS array variable. */
913 tree name_type
= build_cplus_array_type
914 (cp_build_qualified_type (char_type_node
, TYPE_QUAL_CONST
),
917 /* Determine the name of the variable -- and remember with which
918 type it is associated. */
919 name_name
= mangle_typeinfo_string_for_type (target
);
920 TREE_TYPE (name_name
) = target
;
922 name_decl
= build_lang_decl (VAR_DECL
, name_name
, name_type
);
923 SET_DECL_ASSEMBLER_NAME (name_decl
, name_name
);
924 DECL_ARTIFICIAL (name_decl
) = 1;
925 DECL_IGNORED_P (name_decl
) = 1;
926 TREE_READONLY (name_decl
) = 1;
927 TREE_STATIC (name_decl
) = 1;
928 DECL_EXTERNAL (name_decl
) = 0;
929 DECL_TINFO_P (name_decl
) = 1;
930 set_linkage_according_to_type (target
, name_decl
);
931 import_export_decl (name_decl
);
932 name_string
= tinfo_name (target
, !TREE_PUBLIC (name_decl
));
933 DECL_INITIAL (name_decl
) = name_string
;
934 mark_used (name_decl
);
935 pushdecl_top_level_and_finish (name_decl
, name_string
);
938 vtable_ptr
= ti
->vtable
;
942 push_abi_namespace ();
943 real_type
= xref_tag (class_type
, ti
->name
,
944 /*tag_scope=*/ts_current
, false);
945 pop_abi_namespace ();
947 if (!COMPLETE_TYPE_P (real_type
))
949 /* We never saw a definition of this type, so we need to
950 tell the compiler that this is an exported class, as
951 indeed all of the __*_type_info classes are. */
952 SET_CLASSTYPE_INTERFACE_KNOWN (real_type
);
953 CLASSTYPE_INTERFACE_ONLY (real_type
) = 1;
956 vtable_ptr
= get_vtable_decl (real_type
, /*complete=*/1);
957 vtable_ptr
= cp_build_addr_expr (vtable_ptr
, tf_warning_or_error
);
959 /* We need to point into the middle of the vtable. */
960 vtable_ptr
= fold_build_pointer_plus
962 size_binop (MULT_EXPR
,
963 size_int (2 * TARGET_VTABLE_DATA_ENTRY_DISTANCE
),
964 TYPE_SIZE_UNIT (vtable_entry_type
)));
966 ti
->vtable
= vtable_ptr
;
970 CONSTRUCTOR_APPEND_ELT (v
, NULL_TREE
, vtable_ptr
);
971 CONSTRUCTOR_APPEND_ELT (v
, NULL_TREE
,
972 decay_conversion (name_decl
, tf_warning_or_error
));
974 init
= build_constructor (init_list_type_node
, v
);
975 TREE_CONSTANT (init
) = 1;
976 TREE_STATIC (init
) = 1;
981 /* Return the CONSTRUCTOR expr for a type_info of TYPE. TI provides the
982 information about the particular type_info derivation, which adds no
983 additional fields to the type_info base. */
986 generic_initializer (tinfo_s
*ti
, tree target
)
988 tree init
= tinfo_base_init (ti
, target
);
990 init
= build_constructor_single (init_list_type_node
, NULL_TREE
, init
);
991 TREE_CONSTANT (init
) = 1;
992 TREE_STATIC (init
) = 1;
996 /* Return the CONSTRUCTOR expr for a type_info of pointer TYPE.
997 TI provides information about the particular type_info derivation,
998 which adds target type and qualifier flags members to the type_info base. */
1001 ptr_initializer (tinfo_s
*ti
, tree target
)
1003 tree init
= tinfo_base_init (ti
, target
);
1004 tree to
= TREE_TYPE (target
);
1005 int flags
= qualifier_flags (to
);
1006 bool incomplete
= target_incomplete_p (to
);
1007 vec
<constructor_elt
, va_gc
> *v
;
1012 if (tx_safe_fn_type_p (to
))
1015 to
= tx_unsafe_fn_variant (to
);
1017 if (flag_noexcept_type
1018 && FUNC_OR_METHOD_TYPE_P (to
)
1019 && TYPE_NOTHROW_P (to
))
1022 to
= build_exception_variant (to
, NULL_TREE
);
1024 CONSTRUCTOR_APPEND_ELT (v
, NULL_TREE
, init
);
1025 CONSTRUCTOR_APPEND_ELT (v
, NULL_TREE
, build_int_cst (NULL_TREE
, flags
));
1026 CONSTRUCTOR_APPEND_ELT (v
, NULL_TREE
,
1027 get_tinfo_ptr (TYPE_MAIN_VARIANT (to
)));
1029 init
= build_constructor (init_list_type_node
, v
);
1030 TREE_CONSTANT (init
) = 1;
1031 TREE_STATIC (init
) = 1;
1035 /* Return the CONSTRUCTOR expr for a type_info of pointer to member data TYPE.
1036 TI provides information about the particular type_info derivation,
1037 which adds class, target type and qualifier flags members to the type_info
1041 ptm_initializer (tinfo_s
*ti
, tree target
)
1043 tree init
= tinfo_base_init (ti
, target
);
1044 tree to
= TYPE_PTRMEM_POINTED_TO_TYPE (target
);
1045 tree klass
= TYPE_PTRMEM_CLASS_TYPE (target
);
1046 int flags
= qualifier_flags (to
);
1047 bool incomplete
= target_incomplete_p (to
);
1048 vec
<constructor_elt
, va_gc
> *v
;
1053 if (!COMPLETE_TYPE_P (klass
))
1055 CONSTRUCTOR_APPEND_ELT (v
, NULL_TREE
, init
);
1056 CONSTRUCTOR_APPEND_ELT (v
, NULL_TREE
, build_int_cst (NULL_TREE
, flags
));
1057 CONSTRUCTOR_APPEND_ELT (v
, NULL_TREE
,
1058 get_tinfo_ptr (TYPE_MAIN_VARIANT (to
)));
1059 CONSTRUCTOR_APPEND_ELT (v
, NULL_TREE
, get_tinfo_ptr (klass
));
1061 init
= build_constructor (init_list_type_node
, v
);
1062 TREE_CONSTANT (init
) = 1;
1063 TREE_STATIC (init
) = 1;
1067 /* Return the CONSTRUCTOR expr for a type_info of class TYPE.
1068 TI provides information about the particular __class_type_info derivation,
1069 which adds hint flags and N extra initializers to the type_info base. */
1072 class_initializer (tinfo_s
*ti
, tree target
, unsigned n
, ...)
1074 tree init
= tinfo_base_init (ti
, target
);
1075 va_list extra_inits
;
1077 vec
<constructor_elt
, va_gc
> *v
;
1080 CONSTRUCTOR_APPEND_ELT (v
, NULL_TREE
, init
);
1081 va_start (extra_inits
, n
);
1082 for (i
= 0; i
< n
; i
++)
1083 CONSTRUCTOR_APPEND_ELT (v
, NULL_TREE
, va_arg (extra_inits
, tree
));
1084 va_end (extra_inits
);
1086 init
= build_constructor (init_list_type_node
, v
);
1087 TREE_CONSTANT (init
) = 1;
1088 TREE_STATIC (init
) = 1;
1092 /* Returns true if the typeinfo for type should be placed in
1093 the runtime library. */
1096 typeinfo_in_lib_p (tree type
)
1098 /* The typeinfo objects for `T*' and `const T*' are in the runtime
1099 library for simple types T. */
1100 if (TYPE_PTR_P (type
)
1101 && (cp_type_quals (TREE_TYPE (type
)) == TYPE_QUAL_CONST
1102 || cp_type_quals (TREE_TYPE (type
)) == TYPE_UNQUALIFIED
))
1103 type
= TREE_TYPE (type
);
1105 switch (TREE_CODE (type
))
1122 /* Generate the initializer for the type info describing TYPE. TK_INDEX is
1123 the index of the descriptor in the tinfo_desc vector. */
1126 get_pseudo_ti_init (tree type
, unsigned tk_index
)
1128 tinfo_s
*ti
= get_tinfo_desc (tk_index
);
1130 gcc_assert (at_eof
);
1133 case TK_POINTER_MEMBER_TYPE
:
1134 return ptm_initializer (ti
, type
);
1136 case TK_POINTER_TYPE
:
1137 return ptr_initializer (ti
, type
);
1139 case TK_BUILTIN_TYPE
:
1140 case TK_ENUMERAL_TYPE
:
1141 case TK_FUNCTION_TYPE
:
1143 return generic_initializer (ti
, type
);
1146 return class_initializer (ti
, type
, 0);
1148 case TK_SI_CLASS_TYPE
:
1150 tree base_binfo
= BINFO_BASE_BINFO (TYPE_BINFO (type
), 0);
1151 tree tinfo
= get_tinfo_ptr (BINFO_TYPE (base_binfo
));
1153 /* get_tinfo_ptr might have reallocated the tinfo_descs vector. */
1154 ti
= &(*tinfo_descs
)[tk_index
];
1155 return class_initializer (ti
, type
, 1, tinfo
);
1160 int hint
= ((CLASSTYPE_REPEATED_BASE_P (type
) << 0)
1161 | (CLASSTYPE_DIAMOND_SHAPED_P (type
) << 1));
1162 tree binfo
= TYPE_BINFO (type
);
1163 unsigned nbases
= BINFO_N_BASE_BINFOS (binfo
);
1164 vec
<tree
, va_gc
> *base_accesses
= BINFO_BASE_ACCESSES (binfo
);
1165 tree offset_type
= LONGPTR_T
;
1166 vec
<constructor_elt
, va_gc
> *init_vec
= NULL
;
1168 gcc_assert (tk_index
- TK_VMI_CLASS_TYPES
+ 1 == nbases
);
1170 vec_safe_grow (init_vec
, nbases
);
1171 /* Generate the base information initializer. */
1172 for (unsigned ix
= nbases
; ix
--;)
1174 tree base_binfo
= BINFO_BASE_BINFO (binfo
, ix
);
1178 vec
<constructor_elt
, va_gc
> *v
;
1180 if ((*base_accesses
)[ix
] == access_public_node
)
1182 tinfo
= get_tinfo_ptr (BINFO_TYPE (base_binfo
));
1183 if (BINFO_VIRTUAL_P (base_binfo
))
1185 /* We store the vtable offset at which the virtual
1186 base offset can be found. */
1187 offset
= BINFO_VPTR_FIELD (base_binfo
);
1191 offset
= BINFO_OFFSET (base_binfo
);
1193 /* Combine offset and flags into one field. */
1194 offset
= fold_convert (offset_type
, offset
);
1195 offset
= fold_build2_loc (input_location
,
1196 LSHIFT_EXPR
, offset_type
, offset
,
1197 build_int_cst (offset_type
, 8));
1198 offset
= fold_build2_loc (input_location
,
1199 BIT_IOR_EXPR
, offset_type
, offset
,
1200 build_int_cst (offset_type
, flags
));
1202 CONSTRUCTOR_APPEND_ELT (v
, NULL_TREE
, tinfo
);
1203 CONSTRUCTOR_APPEND_ELT (v
, NULL_TREE
, offset
);
1204 tree base_init
= build_constructor (init_list_type_node
, v
);
1205 constructor_elt
*e
= &(*init_vec
)[ix
];
1206 e
->index
= NULL_TREE
;
1207 e
->value
= base_init
;
1209 tree base_inits
= build_constructor (init_list_type_node
, init_vec
);
1211 /* get_tinfo_ptr might have reallocated the tinfo_descs vector. */
1212 ti
= &(*tinfo_descs
)[tk_index
];
1213 return class_initializer (ti
, type
, 3,
1214 build_int_cst (NULL_TREE
, hint
),
1215 build_int_cst (NULL_TREE
, nbases
),
1221 /* Return the index of a pseudo type info type node used to describe
1222 TYPE. TYPE must be a complete type (or cv void), except at the end
1223 of the translation unit. */
1226 get_pseudo_ti_index (tree type
)
1230 switch (TREE_CODE (type
))
1233 ix
= TK_POINTER_MEMBER_TYPE
;
1237 ix
= TK_POINTER_TYPE
;
1241 ix
= TK_ENUMERAL_TYPE
;
1245 ix
= TK_FUNCTION_TYPE
;
1254 if (TYPE_PTRMEMFUNC_P (type
))
1255 ix
= TK_POINTER_MEMBER_TYPE
;
1256 else if (!COMPLETE_TYPE_P (type
))
1259 cxx_incomplete_type_error (NULL_TREE
, type
);
1262 else if (!TYPE_BINFO (type
)
1263 || !BINFO_N_BASE_BINFOS (TYPE_BINFO (type
)))
1267 tree binfo
= TYPE_BINFO (type
);
1268 vec
<tree
, va_gc
> *base_accesses
= BINFO_BASE_ACCESSES (binfo
);
1269 tree base_binfo
= BINFO_BASE_BINFO (binfo
, 0);
1270 int num_bases
= BINFO_N_BASE_BINFOS (binfo
);
1273 && (*base_accesses
)[0] == access_public_node
1274 && !BINFO_VIRTUAL_P (base_binfo
)
1275 && integer_zerop (BINFO_OFFSET (base_binfo
)))
1276 /* single non-virtual public. */
1277 ix
= TK_SI_CLASS_TYPE
;
1279 ix
= TK_VMI_CLASS_TYPES
+ num_bases
- 1;
1284 ix
= TK_BUILTIN_TYPE
;
1290 /* Return pointer to tinfo descriptor. Possibly creating the tinfo
1291 descriptor in the first place. */
1294 get_tinfo_desc (unsigned ix
)
1296 unsigned len
= tinfo_descs
->length ();
1300 /* too short, extend. */
1302 vec_safe_reserve (tinfo_descs
, len
);
1304 elt
.type
= elt
.vtable
= elt
.name
= NULL_TREE
;
1306 tinfo_descs
->quick_push (elt
);
1309 tinfo_s
*res
= &(*tinfo_descs
)[ix
];
1314 /* Ok, we have to create it. This layout must be consistent with
1315 that defined in the runtime support. We explicitly manage the
1316 vtable member, and name it for real type as used in the runtime.
1317 The RECORD type has a different name, to avoid collisions. We
1318 have to delay generating the VAR_DECL of the vtable until the end
1319 of the translation, when we'll have seen the library definition,
1320 if there was one. */
1322 /* Fields to add, chained in reverse order. */
1323 tree fields
= NULL_TREE
;
1325 if (ix
>= TK_DERIVED_TYPES
)
1327 /* First field is the pseudo type_info base class. */
1328 tree fld_base
= build_decl (BUILTINS_LOCATION
, FIELD_DECL
, NULL_TREE
,
1329 get_tinfo_desc (TK_TYPE_INFO_TYPE
)->type
);
1331 DECL_CHAIN (fld_base
) = fields
;
1337 case TK_TYPE_INFO_TYPE
:
1339 tree fld_ptr
= build_decl (BUILTINS_LOCATION
, FIELD_DECL
,
1340 NULL_TREE
, const_ptr_type_node
);
1343 tree fld_str
= build_decl (BUILTINS_LOCATION
, FIELD_DECL
,
1344 NULL_TREE
, const_string_type_node
);
1345 DECL_CHAIN (fld_str
) = fields
;
1352 /* Base class internal helper. Pointer to base type, offset to
1354 tree fld_ptr
= build_decl (BUILTINS_LOCATION
, FIELD_DECL
,
1355 NULL_TREE
, type_info_ptr_type
);
1356 DECL_CHAIN (fld_ptr
) = fields
;
1359 tree fld_flag
= build_decl (BUILTINS_LOCATION
, FIELD_DECL
,
1360 NULL_TREE
, LONGPTR_T
);
1361 DECL_CHAIN (fld_flag
) = fields
;
1366 case TK_BUILTIN_TYPE
:
1367 /* Fundamental type_info */
1373 case TK_FUNCTION_TYPE
:
1376 case TK_ENUMERAL_TYPE
:
1379 case TK_POINTER_TYPE
:
1380 case TK_POINTER_MEMBER_TYPE
:
1382 /* Pointer type_info. Adds two fields, qualification mask and
1383 pointer to the pointed to type. This is really a
1384 descendant of __pbase_type_info. */
1385 tree fld_mask
= build_decl (BUILTINS_LOCATION
, FIELD_DECL
,
1386 NULL_TREE
, integer_type_node
);
1387 DECL_CHAIN (fld_mask
) = fields
;
1390 tree fld_ptr
= build_decl (BUILTINS_LOCATION
, FIELD_DECL
,
1391 NULL_TREE
, type_info_ptr_type
);
1392 DECL_CHAIN (fld_ptr
) = fields
;
1395 if (ix
== TK_POINTER_MEMBER_TYPE
)
1397 /* Add a pointer to the class too. */
1398 tree fld_cls
= build_decl (BUILTINS_LOCATION
, FIELD_DECL
,
1399 NULL_TREE
, type_info_ptr_type
);
1400 DECL_CHAIN (fld_cls
) = fields
;
1407 /* Class type_info. No additional fields. */
1410 case TK_SI_CLASS_TYPE
:
1412 /* Single public non-virtual base class. Add pointer to base
1413 class. This is really a descendant of
1414 __class_type_info. */
1415 tree fld_ptr
= build_decl (BUILTINS_LOCATION
, FIELD_DECL
,
1416 NULL_TREE
, type_info_ptr_type
);
1417 DECL_CHAIN (fld_ptr
) = fields
;
1422 default: /* Multiple inheritance. */
1424 unsigned num_bases
= ix
- TK_VMI_CLASS_TYPES
+ 1;
1426 tree fld_flg
= build_decl (BUILTINS_LOCATION
, FIELD_DECL
,
1427 NULL_TREE
, integer_type_node
);
1428 DECL_CHAIN (fld_flg
) = fields
;
1431 tree fld_cnt
= build_decl (BUILTINS_LOCATION
, FIELD_DECL
,
1432 NULL_TREE
, integer_type_node
);
1433 DECL_CHAIN (fld_cnt
) = fields
;
1436 /* Create the array of __base_class_type_info entries. */
1437 tree domain
= build_index_type (size_int (num_bases
- 1));
1438 tree array
= build_array_type (get_tinfo_desc (TK_BASE_TYPE
)->type
,
1440 tree fld_ary
= build_decl (BUILTINS_LOCATION
, FIELD_DECL
,
1442 DECL_CHAIN (fld_ary
) = fields
;
1448 push_abi_namespace ();
1450 /* Generate the pseudo type name. */
1451 const char *real_name
= tinfo_names
[ix
< TK_VMI_CLASS_TYPES
1452 ? ix
: unsigned (TK_VMI_CLASS_TYPES
)];
1453 size_t name_len
= strlen (real_name
);
1454 char *pseudo_name
= (char *) alloca (name_len
+ 30);
1455 memcpy (pseudo_name
, real_name
, name_len
);
1456 /* Those >= TK_VMI_CLASS_TYPES need a discriminator, may as well
1457 apply it to all. See get_peudo_tinfo_index where we make use of
1459 sprintf (pseudo_name
+ name_len
, "_pseudo_%d", ix
);
1461 /* Create the pseudo type. */
1462 tree pseudo_type
= make_class_type (RECORD_TYPE
);
1463 /* Pass the fields chained in reverse. */
1464 finish_builtin_struct (pseudo_type
, pseudo_name
, fields
, NULL_TREE
);
1465 CLASSTYPE_AS_BASE (pseudo_type
) = pseudo_type
;
1467 res
->type
= cp_build_qualified_type (pseudo_type
, TYPE_QUAL_CONST
);
1468 res
->name
= get_identifier (real_name
);
1470 /* Pretend this is public so determine_visibility doesn't give vtables
1471 internal linkage. */
1472 TREE_PUBLIC (TYPE_MAIN_DECL (res
->type
)) = 1;
1474 pop_abi_namespace ();
1478 /* We lazily create the type info types. */
1481 create_tinfo_types (void)
1483 gcc_assert (!tinfo_descs
);
1485 vec_alloc (tinfo_descs
, TK_MAX
+ 20);
1488 /* Helper for emit_support_tinfos. Emits the type_info descriptor of
1492 emit_support_tinfo_1 (tree bltn
)
1496 if (bltn
== NULL_TREE
)
1499 types
[1] = build_pointer_type (bltn
);
1500 types
[2] = build_pointer_type (cp_build_qualified_type (bltn
,
1503 for (int i
= 0; i
< 3; ++i
)
1505 tree tinfo
= get_tinfo_decl (types
[i
]);
1506 TREE_USED (tinfo
) = 1;
1507 mark_needed (tinfo
);
1508 /* The C++ ABI requires that these objects be COMDAT. But,
1509 On systems without weak symbols, initialized COMDAT
1510 objects are emitted with internal linkage. (See
1511 comdat_linkage for details.) Since we want these objects
1512 to have external linkage so that copies do not have to be
1513 emitted in code outside the runtime library, we make them
1516 It might also not be necessary to follow this detail of the
1518 if (!flag_weak
|| ! targetm
.cxx
.library_rtti_comdat ())
1520 gcc_assert (TREE_PUBLIC (tinfo
) && !DECL_COMDAT (tinfo
));
1521 DECL_INTERFACE_KNOWN (tinfo
) = 1;
1526 /* Emit the type_info descriptors which are guaranteed to be in the runtime
1527 support. Generating them here guarantees consistency with the other
1528 structures. We use the following heuristic to determine when the runtime
1529 is being generated. If std::__fundamental_type_info is defined, and its
1530 destructor is defined, then the runtime is being built. */
1533 emit_support_tinfos (void)
1535 /* Dummy static variable so we can put nullptr in the array; it will be
1536 set before we actually start to walk the array. */
1537 static tree
*const fundamentals
[] =
1541 &wchar_type_node
, &char8_type_node
, &char16_type_node
, &char32_type_node
,
1542 &char_type_node
, &signed_char_type_node
, &unsigned_char_type_node
,
1543 &short_integer_type_node
, &short_unsigned_type_node
,
1544 &integer_type_node
, &unsigned_type_node
,
1545 &long_integer_type_node
, &long_unsigned_type_node
,
1546 &long_long_integer_type_node
, &long_long_unsigned_type_node
,
1547 &float_type_node
, &double_type_node
, &long_double_type_node
,
1548 &dfloat32_type_node
, &dfloat64_type_node
, &dfloat128_type_node
,
1554 /* Look for a defined class. */
1555 tree bltn_type
= lookup_qualified_name
1556 (abi_node
, "__fundamental_type_info", true, false);
1557 if (TREE_CODE (bltn_type
) != TYPE_DECL
)
1560 bltn_type
= TREE_TYPE (bltn_type
);
1561 if (!COMPLETE_TYPE_P (bltn_type
))
1563 tree dtor
= CLASSTYPE_DESTRUCTOR (bltn_type
);
1564 if (!dtor
|| DECL_EXTERNAL (dtor
))
1567 /* All these are really builtins. So set the location. */
1568 location_t saved_loc
= input_location
;
1569 input_location
= BUILTINS_LOCATION
;
1571 for (ix
= 0; fundamentals
[ix
]; ix
++)
1572 emit_support_tinfo_1 (*fundamentals
[ix
]);
1573 for (ix
= 0; ix
< NUM_INT_N_ENTS
; ix
++)
1574 if (int_n_enabled_p
[ix
])
1576 emit_support_tinfo_1 (int_n_trees
[ix
].signed_type
);
1577 emit_support_tinfo_1 (int_n_trees
[ix
].unsigned_type
);
1579 for (tree t
= registered_builtin_types
; t
; t
= TREE_CHAIN (t
))
1580 emit_support_tinfo_1 (TREE_VALUE (t
));
1581 input_location
= saved_loc
;
1584 /* Finish a type info decl. DECL_PTR is a pointer to an unemitted
1585 tinfo decl. Determine whether it needs emitting, and if so
1586 generate the initializer. */
1589 emit_tinfo_decl (tree decl
)
1591 tree type
= TREE_TYPE (DECL_NAME (decl
));
1592 int in_library
= typeinfo_in_lib_p (type
);
1594 gcc_assert (DECL_TINFO_P (decl
));
1599 DECL_EXTERNAL (decl
) = 0;
1602 /* If we're not in the runtime, then DECL (which is already
1603 DECL_EXTERNAL) will not be defined here. */
1604 DECL_INTERFACE_KNOWN (decl
) = 1;
1608 else if (involves_incomplete_p (type
))
1610 if (!decl_needed_p (decl
))
1612 /* If TYPE involves an incomplete class type, then the typeinfo
1613 object will be emitted with internal linkage. There is no
1614 way to know whether or not types are incomplete until the end
1615 of the compilation, so this determination must be deferred
1616 until this point. */
1617 TREE_PUBLIC (decl
) = 0;
1618 DECL_EXTERNAL (decl
) = 0;
1619 DECL_INTERFACE_KNOWN (decl
) = 1;
1622 import_export_decl (decl
);
1623 if (DECL_NOT_REALLY_EXTERN (decl
) && decl_needed_p (decl
))
1627 DECL_EXTERNAL (decl
) = 0;
1628 init
= get_pseudo_ti_init (type
, get_pseudo_ti_index (type
));
1629 DECL_INITIAL (decl
) = init
;
1631 cp_finish_decl (decl
, init
, false, NULL_TREE
, 0);
1632 /* Avoid targets optionally bumping up the alignment to improve
1633 vector instruction accesses, tinfo are never accessed this way. */
1634 #ifdef DATA_ABI_ALIGNMENT
1635 SET_DECL_ALIGN (decl
, DATA_ABI_ALIGNMENT (decl
, TYPE_ALIGN (TREE_TYPE (decl
))));
1636 DECL_USER_ALIGN (decl
) = true;
1644 #include "gt-cp-rtti.h"