1 /* RunTime Type Identification
2 Copyright (C) 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004,
3 2005, 2006, 2007, 2008, 2009
4 Free Software Foundation, Inc.
5 Mostly written by Jason Merrill (jason@cygnus.com).
7 This file is part of GCC.
9 GCC is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 3, or (at your option)
14 GCC is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
19 You should have received a copy of the GNU General Public License
20 along with GCC; see the file COPYING3. If not see
21 <http://www.gnu.org/licenses/>. */
26 #include "coretypes.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 DEF_VEC_ALLOC_O(tinfo_s
,gc
);
81 typedef enum tinfo_kind
83 TK_TYPE_INFO_TYPE
, /* abi::__type_info_pseudo */
84 TK_BASE_TYPE
, /* abi::__base_class_type_info */
85 TK_BUILTIN_TYPE
, /* abi::__fundamental_type_info */
86 TK_ARRAY_TYPE
, /* abi::__array_type_info */
87 TK_FUNCTION_TYPE
, /* abi::__function_type_info */
88 TK_ENUMERAL_TYPE
, /* abi::__enum_type_info */
89 TK_POINTER_TYPE
, /* abi::__pointer_type_info */
90 TK_POINTER_MEMBER_TYPE
, /* abi::__pointer_to_member_type_info */
91 TK_CLASS_TYPE
, /* abi::__class_type_info */
92 TK_SI_CLASS_TYPE
, /* abi::__si_class_type_info */
93 TK_FIXED
/* end of fixed descriptors. */
94 /* ... abi::__vmi_type_info<I> */
97 /* A vector of all tinfo decls that haven't yet been emitted. */
98 VEC(tree
,gc
) *unemitted_tinfo_decls
;
100 /* A vector of all type_info derived types we need. The first few are
101 fixed and created early. The remainder are for multiple inheritance
102 and are generated as needed. */
103 static GTY (()) VEC(tinfo_s
,gc
) *tinfo_descs
;
105 static tree
ifnonnull (tree
, tree
);
106 static tree
tinfo_name (tree
, bool);
107 static tree
build_dynamic_cast_1 (tree
, tree
, tsubst_flags_t
);
108 static tree
throw_bad_cast (void);
109 static tree
throw_bad_typeid (void);
110 static tree
get_tinfo_decl_dynamic (tree
);
111 static tree
get_tinfo_ptr (tree
);
112 static bool typeid_ok_p (void);
113 static int qualifier_flags (tree
);
114 static bool target_incomplete_p (tree
);
115 static tree
tinfo_base_init (tinfo_s
*, tree
);
116 static tree
generic_initializer (tinfo_s
*, tree
);
117 static tree
ptr_initializer (tinfo_s
*, tree
);
118 static tree
ptm_initializer (tinfo_s
*, tree
);
119 static tree
class_initializer (tinfo_s
*, tree
, unsigned, ...);
120 static void create_pseudo_type_info (int, const char *, ...);
121 static tree
get_pseudo_ti_init (tree
, unsigned);
122 static unsigned get_pseudo_ti_index (tree
);
123 static void create_tinfo_types (void);
124 static bool typeinfo_in_lib_p (tree
);
126 static int doing_runtime
= 0;
129 push_abi_namespace (void)
131 push_nested_namespace (abi_node
);
132 push_visibility ("default", 2);
136 pop_abi_namespace (void)
139 pop_nested_namespace (abi_node
);
142 /* Declare language defined type_info type and a pointer to const
143 type_info. This is incomplete here, and will be completed when
144 the user #includes <typeinfo>. There are language defined
145 restrictions on what can be done until that is included. Create
146 the internal versions of the ABI types. */
149 init_rtti_processing (void)
153 push_namespace (std_identifier
);
154 type_info_type
= xref_tag (class_type
, get_identifier ("type_info"),
155 /*tag_scope=*/ts_current
, false);
157 const_type_info_type_node
158 = cp_build_qualified_type (type_info_type
, TYPE_QUAL_CONST
);
159 type_info_ptr_type
= build_pointer_type (const_type_info_type_node
);
161 unemitted_tinfo_decls
= VEC_alloc (tree
, gc
, 124);
163 create_tinfo_types ();
166 /* Given the expression EXP of type `class *', return the head of the
167 object pointed to by EXP with type cv void*, if the class has any
168 virtual functions (TYPE_POLYMORPHIC_P), else just return the
172 build_headof (tree exp
)
174 tree type
= TREE_TYPE (exp
);
178 gcc_assert (TREE_CODE (type
) == POINTER_TYPE
);
179 type
= TREE_TYPE (type
);
181 if (!TYPE_POLYMORPHIC_P (type
))
184 /* We use this a couple of times below, protect it. */
185 exp
= save_expr (exp
);
187 /* The offset-to-top field is at index -2 from the vptr. */
188 index
= build_int_cst (NULL_TREE
,
189 -2 * TARGET_VTABLE_DATA_ENTRY_DISTANCE
);
191 offset
= build_vtbl_ref (cp_build_indirect_ref (exp
, RO_NULL
,
192 tf_warning_or_error
),
195 type
= cp_build_qualified_type (ptr_type_node
,
196 cp_type_quals (TREE_TYPE (exp
)));
197 return build2 (POINTER_PLUS_EXPR
, type
, exp
,
198 convert_to_integer (sizetype
, offset
));
201 /* Get a bad_cast node for the program to throw...
203 See libstdc++/exception.cc for __throw_bad_cast */
206 throw_bad_cast (void)
208 tree fn
= get_identifier ("__cxa_bad_cast");
209 if (!get_global_value_if_present (fn
, &fn
))
210 fn
= push_throw_library_fn (fn
, build_function_type_list (ptr_type_node
,
213 return build_cxx_call (fn
, 0, NULL
);
216 /* Return an expression for "__cxa_bad_typeid()". The expression
217 returned is an lvalue of type "const std::type_info". */
220 throw_bad_typeid (void)
222 tree fn
= get_identifier ("__cxa_bad_typeid");
223 if (!get_global_value_if_present (fn
, &fn
))
227 t
= build_reference_type (const_type_info_type_node
);
228 t
= build_function_type_list (t
, NULL_TREE
);
229 fn
= push_throw_library_fn (fn
, t
);
232 return build_cxx_call (fn
, 0, NULL
);
235 /* Return an lvalue expression whose type is "const std::type_info"
236 and whose value indicates the type of the expression EXP. If EXP
237 is a reference to a polymorphic class, return the dynamic type;
238 otherwise return the static type of the expression. */
241 get_tinfo_decl_dynamic (tree exp
)
246 if (error_operand_p (exp
))
247 return error_mark_node
;
249 exp
= resolve_nondeduced_context (exp
);
251 /* peel back references, so they match. */
252 type
= non_reference (TREE_TYPE (exp
));
254 /* Peel off cv qualifiers. */
255 type
= TYPE_MAIN_VARIANT (type
);
257 /* For UNKNOWN_TYPEs call complete_type_or_else to get diagnostics. */
258 if (CLASS_TYPE_P (type
) || type
== unknown_type_node
259 || type
== init_list_type_node
)
260 type
= complete_type_or_else (type
, exp
);
263 return error_mark_node
;
265 /* If exp is a reference to polymorphic type, get the real type_info. */
266 if (TYPE_POLYMORPHIC_P (type
) && ! resolves_to_fixed_type_p (exp
, 0))
268 /* build reference to type_info from vtable. */
271 /* The RTTI information is at index -1. */
272 index
= build_int_cst (NULL_TREE
,
273 -1 * TARGET_VTABLE_DATA_ENTRY_DISTANCE
);
274 t
= build_vtbl_ref (exp
, index
);
275 t
= convert (type_info_ptr_type
, t
);
278 /* Otherwise return the type_info for the static type of the expr. */
279 t
= get_tinfo_ptr (TYPE_MAIN_VARIANT (type
));
281 return cp_build_indirect_ref (t
, RO_NULL
, tf_warning_or_error
);
287 tree pseudo_type_info
, type_info_type
;
291 error ("cannot use typeid with -fno-rtti");
295 if (!COMPLETE_TYPE_P (const_type_info_type_node
))
297 error ("must #include <typeinfo> before using typeid");
302 = VEC_index (tinfo_s
, tinfo_descs
, TK_TYPE_INFO_TYPE
)->type
;
303 type_info_type
= TYPE_MAIN_VARIANT (const_type_info_type_node
);
305 /* Make sure abi::__type_info_pseudo has the same alias set
306 as std::type_info. */
307 if (! TYPE_ALIAS_SET_KNOWN_P (pseudo_type_info
))
308 TYPE_ALIAS_SET (pseudo_type_info
) = get_alias_set (type_info_type
);
310 gcc_assert (TYPE_ALIAS_SET (pseudo_type_info
)
311 == get_alias_set (type_info_type
));
316 /* Return an expression for "typeid(EXP)". The expression returned is
317 an lvalue of type "const std::type_info". */
320 build_typeid (tree exp
)
322 tree cond
= NULL_TREE
, initial_expr
= exp
;
325 if (exp
== error_mark_node
|| !typeid_ok_p ())
326 return error_mark_node
;
328 if (processing_template_decl
)
329 return build_min (TYPEID_EXPR
, const_type_info_type_node
, exp
);
331 if (TREE_CODE (exp
) == INDIRECT_REF
332 && TREE_CODE (TREE_TYPE (TREE_OPERAND (exp
, 0))) == POINTER_TYPE
333 && TYPE_POLYMORPHIC_P (TREE_TYPE (exp
))
334 && ! resolves_to_fixed_type_p (exp
, &nonnull
)
337 /* So we need to look into the vtable of the type of exp.
338 This is an lvalue use of expr then. */
339 exp
= mark_lvalue_use (exp
);
340 exp
= stabilize_reference (exp
);
341 cond
= cp_convert (boolean_type_node
, TREE_OPERAND (exp
, 0));
344 exp
= get_tinfo_decl_dynamic (exp
);
346 if (exp
== error_mark_node
)
347 return error_mark_node
;
351 tree bad
= throw_bad_typeid ();
353 exp
= build3 (COND_EXPR
, TREE_TYPE (exp
), cond
, exp
, bad
);
356 mark_type_use (initial_expr
);
361 /* Generate the NTBS name of a type. If MARK_PRIVATE, put a '*' in front so that
362 comparisons will be done by pointer rather than string comparison. */
364 tinfo_name (tree type
, bool mark_private
)
370 name
= mangle_type_string (type
);
371 length
= strlen (name
);
375 /* Inject '*' at beginning of name to force pointer comparison. */
376 char* buf
= (char*) XALLOCAVEC (char, length
+ 2);
378 memcpy (buf
+ 1, name
, length
+ 1);
379 name_string
= build_string (length
+ 2, buf
);
382 name_string
= build_string (length
+ 1, name
);
384 return fix_string_type (name_string
);
387 /* Return a VAR_DECL for the internal ABI defined type_info object for
388 TYPE. You must arrange that the decl is mark_used, if actually use
389 it --- decls in vtables are only used if the vtable is output. */
392 get_tinfo_decl (tree type
)
397 if (variably_modified_type_p (type
, /*fn=*/NULL_TREE
))
399 error ("cannot create type information for type %qT because "
400 "it involves types of variable size",
402 return error_mark_node
;
405 if (TREE_CODE (type
) == METHOD_TYPE
)
406 type
= build_function_type (TREE_TYPE (type
),
407 TREE_CHAIN (TYPE_ARG_TYPES (type
)));
409 /* For a class type, the variable is cached in the type node
411 if (CLASS_TYPE_P (type
))
413 d
= CLASSTYPE_TYPEINFO_VAR (TYPE_MAIN_VARIANT (type
));
418 name
= mangle_typeinfo_for_type (type
);
420 d
= IDENTIFIER_GLOBAL_VALUE (name
);
423 int ix
= get_pseudo_ti_index (type
);
424 tinfo_s
*ti
= VEC_index (tinfo_s
, tinfo_descs
, ix
);
426 d
= build_lang_decl (VAR_DECL
, name
, ti
->type
);
427 SET_DECL_ASSEMBLER_NAME (d
, name
);
428 /* Remember the type it is for. */
429 TREE_TYPE (name
) = type
;
430 DECL_TINFO_P (d
) = 1;
431 DECL_ARTIFICIAL (d
) = 1;
432 DECL_IGNORED_P (d
) = 1;
433 TREE_READONLY (d
) = 1;
435 /* Mark the variable as undefined -- but remember that we can
436 define it later if we need to do so. */
437 DECL_EXTERNAL (d
) = 1;
438 DECL_NOT_REALLY_EXTERN (d
) = 1;
439 set_linkage_according_to_type (type
, d
);
441 d
= pushdecl_top_level_and_finish (d
, NULL_TREE
);
442 if (CLASS_TYPE_P (type
))
443 CLASSTYPE_TYPEINFO_VAR (TYPE_MAIN_VARIANT (type
)) = d
;
445 /* Add decl to the global array of tinfo decls. */
446 VEC_safe_push (tree
, gc
, unemitted_tinfo_decls
, d
);
452 /* Return a pointer to a type_info object describing TYPE, suitably
453 cast to the language defined type. */
456 get_tinfo_ptr (tree type
)
458 tree decl
= get_tinfo_decl (type
);
461 return build_nop (type_info_ptr_type
,
462 build_address (decl
));
465 /* Return the type_info object for TYPE. */
468 get_typeid (tree type
)
470 if (type
== error_mark_node
|| !typeid_ok_p ())
471 return error_mark_node
;
473 if (processing_template_decl
)
474 return build_min (TYPEID_EXPR
, const_type_info_type_node
, type
);
476 /* If the type of the type-id is a reference type, the result of the
477 typeid expression refers to a type_info object representing the
479 type
= non_reference (type
);
481 /* The top-level cv-qualifiers of the lvalue expression or the type-id
482 that is the operand of typeid are always ignored. */
483 type
= TYPE_MAIN_VARIANT (type
);
485 /* For UNKNOWN_TYPEs call complete_type_or_else to get diagnostics. */
486 if (CLASS_TYPE_P (type
) || type
== unknown_type_node
487 || type
== init_list_type_node
)
488 type
= complete_type_or_else (type
, NULL_TREE
);
491 return error_mark_node
;
493 return cp_build_indirect_ref (get_tinfo_ptr (type
), RO_NULL
,
494 tf_warning_or_error
);
497 /* Check whether TEST is null before returning RESULT. If TEST is used in
498 RESULT, it must have previously had a save_expr applied to it. */
501 ifnonnull (tree test
, tree result
)
503 return build3 (COND_EXPR
, TREE_TYPE (result
),
504 build2 (EQ_EXPR
, boolean_type_node
, test
,
505 cp_convert (TREE_TYPE (test
), integer_zero_node
)),
506 cp_convert (TREE_TYPE (result
), integer_zero_node
),
510 /* Execute a dynamic cast, as described in section 5.2.6 of the 9/93 working
514 build_dynamic_cast_1 (tree type
, tree expr
, tsubst_flags_t complain
)
516 enum tree_code tc
= TREE_CODE (type
);
517 tree exprtype
= TREE_TYPE (expr
);
519 tree old_expr
= expr
;
520 const char *errstr
= NULL
;
522 /* Save casted types in the function's used types hash table. */
523 used_types_insert (type
);
525 /* T shall be a pointer or reference to a complete class type, or
526 `pointer to cv void''. */
530 if (TREE_CODE (TREE_TYPE (type
)) == VOID_TYPE
)
534 if (! MAYBE_CLASS_TYPE_P (TREE_TYPE (type
)))
536 errstr
= _("target is not pointer or reference to class");
539 if (!COMPLETE_TYPE_P (complete_type (TREE_TYPE (type
))))
541 errstr
= _("target is not pointer or reference to complete type");
547 errstr
= _("target is not pointer or reference");
551 if (tc
== POINTER_TYPE
)
553 /* If T is a pointer type, v shall be an rvalue of a pointer to
554 complete class type, and the result is an rvalue of type T. */
556 expr
= mark_rvalue_use (expr
);
558 if (TREE_CODE (exprtype
) != POINTER_TYPE
)
560 errstr
= _("source is not a pointer");
563 if (! MAYBE_CLASS_TYPE_P (TREE_TYPE (exprtype
)))
565 errstr
= _("source is not a pointer to class");
568 if (!COMPLETE_TYPE_P (complete_type (TREE_TYPE (exprtype
))))
570 errstr
= _("source is a pointer to incomplete type");
576 expr
= mark_lvalue_use (expr
);
578 exprtype
= build_reference_type (exprtype
);
580 /* T is a reference type, v shall be an lvalue of a complete class
581 type, and the result is an lvalue of the type referred to by T. */
583 if (! MAYBE_CLASS_TYPE_P (TREE_TYPE (exprtype
)))
585 errstr
= _("source is not of class type");
588 if (!COMPLETE_TYPE_P (complete_type (TREE_TYPE (exprtype
))))
590 errstr
= _("source is of incomplete class type");
594 /* Apply trivial conversion T -> T& for dereferenced ptrs. */
595 expr
= convert_to_reference (exprtype
, expr
, CONV_IMPLICIT
,
596 LOOKUP_NORMAL
, NULL_TREE
);
599 /* The dynamic_cast operator shall not cast away constness. */
600 if (!at_least_as_qualified_p (TREE_TYPE (type
),
601 TREE_TYPE (exprtype
)))
603 errstr
= _("conversion casts away constness");
607 /* If *type is an unambiguous accessible base class of *exprtype,
608 convert statically. */
612 binfo
= lookup_base (TREE_TYPE (exprtype
), TREE_TYPE (type
),
617 expr
= build_base_path (PLUS_EXPR
, convert_from_reference (expr
),
619 if (TREE_CODE (exprtype
) == POINTER_TYPE
)
620 expr
= rvalue (expr
);
625 /* Otherwise *exprtype must be a polymorphic class (have a vtbl). */
626 if (TYPE_POLYMORPHIC_P (TREE_TYPE (exprtype
)))
629 /* if TYPE is `void *', return pointer to complete object. */
630 if (tc
== POINTER_TYPE
&& VOID_TYPE_P (TREE_TYPE (type
)))
632 /* if b is an object, dynamic_cast<void *>(&b) == (void *)&b. */
633 if (TREE_CODE (expr
) == ADDR_EXPR
634 && TREE_CODE (TREE_OPERAND (expr
, 0)) == VAR_DECL
635 && TREE_CODE (TREE_TYPE (TREE_OPERAND (expr
, 0))) == RECORD_TYPE
)
636 return build1 (NOP_EXPR
, type
, expr
);
638 /* Since expr is used twice below, save it. */
639 expr
= save_expr (expr
);
641 expr1
= build_headof (expr
);
642 if (TREE_TYPE (expr1
) != type
)
643 expr1
= build1 (NOP_EXPR
, type
, expr1
);
644 return ifnonnull (expr
, expr1
);
649 tree result
, td2
, td3
;
651 tree static_type
, target_type
, boff
;
653 /* If we got here, we can't convert statically. Therefore,
654 dynamic_cast<D&>(b) (b an object) cannot succeed. */
655 if (tc
== REFERENCE_TYPE
)
657 if (TREE_CODE (old_expr
) == VAR_DECL
658 && TREE_CODE (TREE_TYPE (old_expr
)) == RECORD_TYPE
)
660 tree expr
= throw_bad_cast ();
661 if (complain
& tf_warning
)
662 warning (0, "dynamic_cast of %q#D to %q#T can never succeed",
664 /* Bash it to the expected type. */
665 TREE_TYPE (expr
) = type
;
669 /* Ditto for dynamic_cast<D*>(&b). */
670 else if (TREE_CODE (expr
) == ADDR_EXPR
)
672 tree op
= TREE_OPERAND (expr
, 0);
673 if (TREE_CODE (op
) == VAR_DECL
674 && TREE_CODE (TREE_TYPE (op
)) == RECORD_TYPE
)
676 if (complain
& tf_warning
)
677 warning (0, "dynamic_cast of %q#D to %q#T can never succeed",
679 retval
= build_int_cst (type
, 0);
684 /* Use of dynamic_cast when -fno-rtti is prohibited. */
687 if (complain
& tf_error
)
688 error ("%<dynamic_cast%> not permitted with -fno-rtti");
689 return error_mark_node
;
692 target_type
= TYPE_MAIN_VARIANT (TREE_TYPE (type
));
693 static_type
= TYPE_MAIN_VARIANT (TREE_TYPE (exprtype
));
694 td2
= get_tinfo_decl (target_type
);
696 td2
= cp_build_unary_op (ADDR_EXPR
, td2
, 0, complain
);
697 td3
= get_tinfo_decl (static_type
);
699 td3
= cp_build_unary_op (ADDR_EXPR
, td3
, 0, complain
);
701 /* Determine how T and V are related. */
702 boff
= dcast_base_hint (static_type
, target_type
);
704 /* Since expr is used twice below, save it. */
705 expr
= save_expr (expr
);
708 if (tc
== REFERENCE_TYPE
)
709 expr1
= cp_build_unary_op (ADDR_EXPR
, expr1
, 0, complain
);
716 dcast_fn
= dynamic_cast_node
;
723 push_abi_namespace ();
724 tinfo_ptr
= xref_tag (class_type
,
725 get_identifier ("__class_type_info"),
726 /*tag_scope=*/ts_current
, false);
728 tinfo_ptr
= build_pointer_type
729 (cp_build_qualified_type
730 (tinfo_ptr
, TYPE_QUAL_CONST
));
731 name
= "__dynamic_cast";
732 tmp
= build_function_type_list (ptr_type_node
,
734 tinfo_ptr
, tinfo_ptr
,
735 ptrdiff_type_node
, NULL_TREE
);
736 dcast_fn
= build_library_fn_ptr (name
, tmp
);
737 DECL_PURE_P (dcast_fn
) = 1;
738 pop_abi_namespace ();
739 dynamic_cast_node
= dcast_fn
;
741 result
= build_cxx_call (dcast_fn
, 4, elems
);
743 if (tc
== REFERENCE_TYPE
)
745 tree bad
= throw_bad_cast ();
748 result
= save_expr (result
);
749 neq
= c_common_truthvalue_conversion (input_location
, result
);
750 return cp_convert (type
,
751 build3 (COND_EXPR
, TREE_TYPE (result
),
755 /* Now back to the type we want from a void*. */
756 result
= cp_convert (type
, result
);
757 return ifnonnull (expr
, result
);
761 errstr
= _("source type is not polymorphic");
764 if (complain
& tf_error
)
765 error ("cannot dynamic_cast %qE (of type %q#T) to type %q#T (%s)",
766 expr
, exprtype
, type
, errstr
);
767 return error_mark_node
;
771 build_dynamic_cast (tree type
, tree expr
, tsubst_flags_t complain
)
773 if (type
== error_mark_node
|| expr
== error_mark_node
)
774 return error_mark_node
;
776 if (processing_template_decl
)
778 expr
= build_min (DYNAMIC_CAST_EXPR
, type
, expr
);
779 TREE_SIDE_EFFECTS (expr
) = 1;
780 return convert_from_reference (expr
);
783 return convert_from_reference (build_dynamic_cast_1 (type
, expr
, complain
));
786 /* Return the runtime bit mask encoding the qualifiers of TYPE. */
789 qualifier_flags (tree type
)
792 int quals
= cp_type_quals (type
);
794 if (quals
& TYPE_QUAL_CONST
)
796 if (quals
& TYPE_QUAL_VOLATILE
)
798 if (quals
& TYPE_QUAL_RESTRICT
)
803 /* Return true, if the pointer chain TYPE ends at an incomplete type, or
804 contains a pointer to member of an incomplete class. */
807 target_incomplete_p (tree type
)
810 if (TYPE_PTRMEM_P (type
))
812 if (!COMPLETE_TYPE_P (TYPE_PTRMEM_CLASS_TYPE (type
)))
814 type
= TYPE_PTRMEM_POINTED_TO_TYPE (type
);
816 else if (TREE_CODE (type
) == POINTER_TYPE
)
817 type
= TREE_TYPE (type
);
819 return !COMPLETE_OR_VOID_TYPE_P (type
);
822 /* Returns true if TYPE involves an incomplete class type; in that
823 case, typeinfo variables for TYPE should be emitted with internal
827 involves_incomplete_p (tree type
)
829 switch (TREE_CODE (type
))
832 return target_incomplete_p (TREE_TYPE (type
));
837 (target_incomplete_p (TYPE_PTRMEM_POINTED_TO_TYPE (type
))
838 || !COMPLETE_TYPE_P (TYPE_PTRMEM_CLASS_TYPE (type
)));
841 if (TYPE_PTRMEMFUNC_P (type
))
845 if (!COMPLETE_TYPE_P (type
))
849 /* All other types do not involve incomplete class types. */
854 /* Return a CONSTRUCTOR for the common part of the type_info objects. This
855 is the vtable pointer and NTBS name. The NTBS name is emitted as a
856 comdat const char array, so it becomes a unique key for the type. Generate
857 and emit that VAR_DECL here. (We can't always emit the type_info itself
858 as comdat, because of pointers to incomplete.) */
861 tinfo_base_init (tinfo_s
*ti
, tree target
)
866 VEC(constructor_elt
,gc
) *v
;
869 tree name_name
, name_string
;
871 /* Generate the NTBS array variable. */
872 tree name_type
= build_cplus_array_type
873 (cp_build_qualified_type (char_type_node
, TYPE_QUAL_CONST
),
876 /* Determine the name of the variable -- and remember with which
877 type it is associated. */
878 name_name
= mangle_typeinfo_string_for_type (target
);
879 TREE_TYPE (name_name
) = target
;
881 name_decl
= build_lang_decl (VAR_DECL
, name_name
, name_type
);
882 SET_DECL_ASSEMBLER_NAME (name_decl
, name_name
);
883 DECL_ARTIFICIAL (name_decl
) = 1;
884 DECL_IGNORED_P (name_decl
) = 1;
885 TREE_READONLY (name_decl
) = 1;
886 TREE_STATIC (name_decl
) = 1;
887 DECL_EXTERNAL (name_decl
) = 0;
888 DECL_TINFO_P (name_decl
) = 1;
889 set_linkage_according_to_type (target
, name_decl
);
890 import_export_decl (name_decl
);
891 name_string
= tinfo_name (target
, !TREE_PUBLIC (name_decl
));
892 DECL_INITIAL (name_decl
) = name_string
;
893 mark_used (name_decl
);
894 pushdecl_top_level_and_finish (name_decl
, name_string
);
897 vtable_ptr
= ti
->vtable
;
901 push_abi_namespace ();
902 real_type
= xref_tag (class_type
, ti
->name
,
903 /*tag_scope=*/ts_current
, false);
904 pop_abi_namespace ();
906 if (!COMPLETE_TYPE_P (real_type
))
908 /* We never saw a definition of this type, so we need to
909 tell the compiler that this is an exported class, as
910 indeed all of the __*_type_info classes are. */
911 SET_CLASSTYPE_INTERFACE_KNOWN (real_type
);
912 CLASSTYPE_INTERFACE_ONLY (real_type
) = 1;
915 vtable_ptr
= get_vtable_decl (real_type
, /*complete=*/1);
916 vtable_ptr
= cp_build_unary_op (ADDR_EXPR
, vtable_ptr
, 0,
917 tf_warning_or_error
);
919 /* We need to point into the middle of the vtable. */
921 (POINTER_PLUS_EXPR
, TREE_TYPE (vtable_ptr
), vtable_ptr
,
922 size_binop (MULT_EXPR
,
923 size_int (2 * TARGET_VTABLE_DATA_ENTRY_DISTANCE
),
924 TYPE_SIZE_UNIT (vtable_entry_type
)));
926 ti
->vtable
= vtable_ptr
;
929 v
= VEC_alloc (constructor_elt
, gc
, 2);
930 CONSTRUCTOR_APPEND_ELT (v
, NULL_TREE
, vtable_ptr
);
931 CONSTRUCTOR_APPEND_ELT (v
, NULL_TREE
, decay_conversion (name_decl
));
933 init
= build_constructor (init_list_type_node
, v
);
934 TREE_CONSTANT (init
) = 1;
935 TREE_STATIC (init
) = 1;
940 /* Return the CONSTRUCTOR expr for a type_info of TYPE. TI provides the
941 information about the particular type_info derivation, which adds no
942 additional fields to the type_info base. */
945 generic_initializer (tinfo_s
*ti
, tree target
)
947 tree init
= tinfo_base_init (ti
, target
);
949 init
= build_constructor_single (init_list_type_node
, NULL_TREE
, init
);
950 TREE_CONSTANT (init
) = 1;
951 TREE_STATIC (init
) = 1;
955 /* Return the CONSTRUCTOR expr for a type_info of pointer TYPE.
956 TI provides information about the particular type_info derivation,
957 which adds target type and qualifier flags members to the type_info base. */
960 ptr_initializer (tinfo_s
*ti
, tree target
)
962 tree init
= tinfo_base_init (ti
, target
);
963 tree to
= TREE_TYPE (target
);
964 int flags
= qualifier_flags (to
);
965 bool incomplete
= target_incomplete_p (to
);
966 VEC(constructor_elt
,gc
) *v
= VEC_alloc (constructor_elt
, gc
, 3);
970 CONSTRUCTOR_APPEND_ELT (v
, NULL_TREE
, init
);
971 CONSTRUCTOR_APPEND_ELT (v
, NULL_TREE
, build_int_cst (NULL_TREE
, flags
));
972 CONSTRUCTOR_APPEND_ELT (v
, NULL_TREE
,
973 get_tinfo_ptr (TYPE_MAIN_VARIANT (to
)));
975 init
= build_constructor (init_list_type_node
, v
);
976 TREE_CONSTANT (init
) = 1;
977 TREE_STATIC (init
) = 1;
981 /* Return the CONSTRUCTOR expr for a type_info of pointer to member data TYPE.
982 TI provides information about the particular type_info derivation,
983 which adds class, target type and qualifier flags members to the type_info
987 ptm_initializer (tinfo_s
*ti
, tree target
)
989 tree init
= tinfo_base_init (ti
, target
);
990 tree to
= TYPE_PTRMEM_POINTED_TO_TYPE (target
);
991 tree klass
= TYPE_PTRMEM_CLASS_TYPE (target
);
992 int flags
= qualifier_flags (to
);
993 bool incomplete
= target_incomplete_p (to
);
994 VEC(constructor_elt
,gc
) *v
= VEC_alloc (constructor_elt
, gc
, 4);
998 if (!COMPLETE_TYPE_P (klass
))
1000 CONSTRUCTOR_APPEND_ELT (v
, NULL_TREE
, init
);
1001 CONSTRUCTOR_APPEND_ELT (v
, NULL_TREE
, build_int_cst (NULL_TREE
, flags
));
1002 CONSTRUCTOR_APPEND_ELT (v
, NULL_TREE
,
1003 get_tinfo_ptr (TYPE_MAIN_VARIANT (to
)));
1004 CONSTRUCTOR_APPEND_ELT (v
, NULL_TREE
, get_tinfo_ptr (klass
));
1006 init
= build_constructor (init_list_type_node
, v
);
1007 TREE_CONSTANT (init
) = 1;
1008 TREE_STATIC (init
) = 1;
1012 /* Return the CONSTRUCTOR expr for a type_info of class TYPE.
1013 TI provides information about the particular __class_type_info derivation,
1014 which adds hint flags and N extra initializers to the type_info base. */
1017 class_initializer (tinfo_s
*ti
, tree target
, unsigned n
, ...)
1019 tree init
= tinfo_base_init (ti
, target
);
1020 va_list extra_inits
;
1022 VEC(constructor_elt
,gc
) *v
= VEC_alloc (constructor_elt
, gc
, n
+1);
1024 CONSTRUCTOR_APPEND_ELT (v
, NULL_TREE
, init
);
1025 va_start (extra_inits
, n
);
1026 for (i
= 0; i
< n
; i
++)
1027 CONSTRUCTOR_APPEND_ELT (v
, NULL_TREE
, va_arg (extra_inits
, tree
));
1028 va_end (extra_inits
);
1030 init
= build_constructor (init_list_type_node
, v
);
1031 TREE_CONSTANT (init
) = 1;
1032 TREE_STATIC (init
) = 1;
1036 /* Returns true if the typeinfo for type should be placed in
1037 the runtime library. */
1040 typeinfo_in_lib_p (tree type
)
1042 /* The typeinfo objects for `T*' and `const T*' are in the runtime
1043 library for simple types T. */
1044 if (TREE_CODE (type
) == POINTER_TYPE
1045 && (cp_type_quals (TREE_TYPE (type
)) == TYPE_QUAL_CONST
1046 || cp_type_quals (TREE_TYPE (type
)) == TYPE_UNQUALIFIED
))
1047 type
= TREE_TYPE (type
);
1049 switch (TREE_CODE (type
))
1058 if (NULLPTR_TYPE_P (type
))
1060 /* else fall through. */
1067 /* Generate the initializer for the type info describing TYPE. TK_INDEX is
1068 the index of the descriptor in the tinfo_desc vector. */
1071 get_pseudo_ti_init (tree type
, unsigned tk_index
)
1073 tinfo_s
*ti
= VEC_index (tinfo_s
, tinfo_descs
, tk_index
);
1075 gcc_assert (at_eof
);
1078 case TK_POINTER_MEMBER_TYPE
:
1079 return ptm_initializer (ti
, type
);
1081 case TK_POINTER_TYPE
:
1082 return ptr_initializer (ti
, type
);
1084 case TK_BUILTIN_TYPE
:
1085 case TK_ENUMERAL_TYPE
:
1086 case TK_FUNCTION_TYPE
:
1088 return generic_initializer (ti
, type
);
1091 return class_initializer (ti
, type
, 0);
1093 case TK_SI_CLASS_TYPE
:
1095 tree base_binfo
= BINFO_BASE_BINFO (TYPE_BINFO (type
), 0);
1096 tree tinfo
= get_tinfo_ptr (BINFO_TYPE (base_binfo
));
1098 /* get_tinfo_ptr might have reallocated the tinfo_descs vector. */
1099 ti
= VEC_index (tinfo_s
, tinfo_descs
, tk_index
);
1100 return class_initializer (ti
, type
, 1, tinfo
);
1105 int hint
= ((CLASSTYPE_REPEATED_BASE_P (type
) << 0)
1106 | (CLASSTYPE_DIAMOND_SHAPED_P (type
) << 1));
1107 tree binfo
= TYPE_BINFO (type
);
1108 int nbases
= BINFO_N_BASE_BINFOS (binfo
);
1109 VEC(tree
,gc
) *base_accesses
= BINFO_BASE_ACCESSES (binfo
);
1110 tree offset_type
= integer_types
[itk_long
];
1111 tree base_inits
= NULL_TREE
;
1113 VEC(constructor_elt
,gc
) *init_vec
= NULL
;
1116 gcc_assert (tk_index
>= TK_FIXED
);
1118 VEC_safe_grow (constructor_elt
, gc
, init_vec
, nbases
);
1119 /* Generate the base information initializer. */
1120 for (ix
= nbases
; ix
--;)
1122 tree base_binfo
= BINFO_BASE_BINFO (binfo
, ix
);
1127 VEC(constructor_elt
,gc
) *v
;
1129 if (VEC_index (tree
, base_accesses
, ix
) == access_public_node
)
1131 tinfo
= get_tinfo_ptr (BINFO_TYPE (base_binfo
));
1132 if (BINFO_VIRTUAL_P (base_binfo
))
1134 /* We store the vtable offset at which the virtual
1135 base offset can be found. */
1136 offset
= BINFO_VPTR_FIELD (base_binfo
);
1140 offset
= BINFO_OFFSET (base_binfo
);
1142 /* Combine offset and flags into one field. */
1143 offset
= fold_convert (offset_type
, offset
);
1144 offset
= fold_build2_loc (input_location
,
1145 LSHIFT_EXPR
, offset_type
, offset
,
1146 build_int_cst (offset_type
, 8));
1147 offset
= fold_build2_loc (input_location
,
1148 BIT_IOR_EXPR
, offset_type
, offset
,
1149 build_int_cst (offset_type
, flags
));
1150 v
= VEC_alloc (constructor_elt
, gc
, 2);
1151 CONSTRUCTOR_APPEND_ELT (v
, NULL_TREE
, tinfo
);
1152 CONSTRUCTOR_APPEND_ELT (v
, NULL_TREE
, offset
);
1153 base_init
= build_constructor (init_list_type_node
, v
);
1154 e
= VEC_index (constructor_elt
, init_vec
, ix
);
1155 e
->index
= NULL_TREE
;
1156 e
->value
= base_init
;
1158 base_inits
= build_constructor (init_list_type_node
, init_vec
);
1160 /* get_tinfo_ptr might have reallocated the tinfo_descs vector. */
1161 ti
= VEC_index (tinfo_s
, tinfo_descs
, tk_index
);
1162 return class_initializer (ti
, type
, 3,
1163 build_int_cst (NULL_TREE
, hint
),
1164 build_int_cst (NULL_TREE
, nbases
),
1170 /* Generate the RECORD_TYPE containing the data layout of a type_info
1171 derivative as used by the runtime. This layout must be consistent with
1172 that defined in the runtime support. Also generate the VAR_DECL for the
1173 type's vtable. We explicitly manage the vtable member, and name it for
1174 real type as used in the runtime. The RECORD type has a different name,
1175 to avoid collisions. Return a TREE_LIST who's TINFO_PSEUDO_TYPE
1176 is the generated type and TINFO_VTABLE_NAME is the name of the
1177 vtable. We have to delay generating the VAR_DECL of the vtable
1178 until the end of the translation, when we'll have seen the library
1179 definition, if there was one.
1181 REAL_NAME is the runtime's name of the type. Trailing arguments are
1182 additional FIELD_DECL's for the structure. The final argument must be
1186 create_pseudo_type_info (int tk
, const char *real_name
, ...)
1195 va_start (ap
, real_name
);
1197 /* Generate the pseudo type name. */
1198 pseudo_name
= (char *) alloca (strlen (real_name
) + 30);
1199 strcpy (pseudo_name
, real_name
);
1200 strcat (pseudo_name
, "_pseudo");
1202 sprintf (pseudo_name
+ strlen (pseudo_name
), "%d", tk
- TK_FIXED
);
1204 /* First field is the pseudo type_info base class. */
1205 fields
= build_decl (input_location
,
1206 FIELD_DECL
, NULL_TREE
,
1207 VEC_index (tinfo_s
, tinfo_descs
,
1208 TK_TYPE_INFO_TYPE
)->type
);
1210 /* Now add the derived fields. */
1211 while ((field_decl
= va_arg (ap
, tree
)))
1213 DECL_CHAIN (field_decl
) = fields
;
1214 fields
= field_decl
;
1217 /* Create the pseudo type. */
1218 pseudo_type
= make_class_type (RECORD_TYPE
);
1219 finish_builtin_struct (pseudo_type
, pseudo_name
, fields
, NULL_TREE
);
1220 CLASSTYPE_AS_BASE (pseudo_type
) = pseudo_type
;
1222 ti
= VEC_index (tinfo_s
, tinfo_descs
, tk
);
1223 ti
->type
= cp_build_qualified_type (pseudo_type
, TYPE_QUAL_CONST
);
1224 ti
->name
= get_identifier (real_name
);
1225 ti
->vtable
= NULL_TREE
;
1227 /* Pretend this is public so determine_visibility doesn't give vtables
1228 internal linkage. */
1229 TREE_PUBLIC (TYPE_MAIN_DECL (ti
->type
)) = 1;
1234 /* Return the index of a pseudo type info type node used to describe
1235 TYPE. TYPE must be a complete type (or cv void), except at the end
1236 of the translation unit. */
1239 get_pseudo_ti_index (tree type
)
1243 switch (TREE_CODE (type
))
1246 ix
= TK_POINTER_MEMBER_TYPE
;
1250 ix
= TK_POINTER_TYPE
;
1254 ix
= TK_ENUMERAL_TYPE
;
1258 ix
= TK_FUNCTION_TYPE
;
1267 if (TYPE_PTRMEMFUNC_P (type
))
1269 ix
= TK_POINTER_MEMBER_TYPE
;
1272 else if (!COMPLETE_TYPE_P (type
))
1275 cxx_incomplete_type_error (NULL_TREE
, type
);
1279 else if (!BINFO_N_BASE_BINFOS (TYPE_BINFO (type
)))
1286 tree binfo
= TYPE_BINFO (type
);
1287 VEC(tree
,gc
) *base_accesses
= BINFO_BASE_ACCESSES (binfo
);
1288 tree base_binfo
= BINFO_BASE_BINFO (binfo
, 0);
1289 int num_bases
= BINFO_N_BASE_BINFOS (binfo
);
1292 && VEC_index (tree
, base_accesses
, 0) == access_public_node
1293 && !BINFO_VIRTUAL_P (base_binfo
)
1294 && integer_zerop (BINFO_OFFSET (base_binfo
)))
1296 /* single non-virtual public. */
1297 ix
= TK_SI_CLASS_TYPE
;
1303 tree array_domain
, base_array
;
1305 ix
= TK_FIXED
+ num_bases
;
1306 if (VEC_length (tinfo_s
, tinfo_descs
) <= ix
)
1308 /* too short, extend. */
1309 unsigned len
= VEC_length (tinfo_s
, tinfo_descs
);
1311 VEC_safe_grow (tinfo_s
, gc
, tinfo_descs
, ix
+ 1);
1312 while (VEC_iterate (tinfo_s
, tinfo_descs
, len
++, ti
))
1313 ti
->type
= ti
->vtable
= ti
->name
= NULL_TREE
;
1315 else if (VEC_index (tinfo_s
, tinfo_descs
, ix
)->type
)
1316 /* already created. */
1319 /* Create the array of __base_class_type_info entries.
1320 G++ 3.2 allocated an array that had one too many
1321 entries, and then filled that extra entries with
1323 if (abi_version_at_least (2))
1324 array_domain
= build_index_type (size_int (num_bases
- 1));
1326 array_domain
= build_index_type (size_int (num_bases
));
1328 build_array_type (VEC_index (tinfo_s
, tinfo_descs
,
1329 TK_BASE_TYPE
)->type
,
1332 push_abi_namespace ();
1333 create_pseudo_type_info
1334 (ix
, "__vmi_class_type_info",
1335 build_decl (input_location
,
1336 FIELD_DECL
, NULL_TREE
, integer_type_node
),
1337 build_decl (input_location
,
1338 FIELD_DECL
, NULL_TREE
, integer_type_node
),
1339 build_decl (input_location
,
1340 FIELD_DECL
, NULL_TREE
, base_array
),
1342 pop_abi_namespace ();
1347 ix
= TK_BUILTIN_TYPE
;
1353 /* Make sure the required builtin types exist for generating the type_info
1354 variable definitions. */
1357 create_tinfo_types (void)
1361 gcc_assert (!tinfo_descs
);
1363 VEC_safe_grow (tinfo_s
, gc
, tinfo_descs
, TK_FIXED
);
1365 push_abi_namespace ();
1367 /* Create the internal type_info structure. This is used as a base for
1368 the other structures. */
1372 field
= build_decl (BUILTINS_LOCATION
,
1373 FIELD_DECL
, NULL_TREE
, const_ptr_type_node
);
1376 field
= build_decl (BUILTINS_LOCATION
,
1377 FIELD_DECL
, NULL_TREE
, const_string_type_node
);
1378 DECL_CHAIN (field
) = fields
;
1381 ti
= VEC_index (tinfo_s
, tinfo_descs
, TK_TYPE_INFO_TYPE
);
1382 ti
->type
= make_class_type (RECORD_TYPE
);
1383 ti
->vtable
= NULL_TREE
;
1384 ti
->name
= NULL_TREE
;
1385 finish_builtin_struct (ti
->type
, "__type_info_pseudo",
1389 /* Fundamental type_info */
1390 create_pseudo_type_info (TK_BUILTIN_TYPE
, "__fundamental_type_info", NULL
);
1392 /* Array, function and enum type_info. No additional fields. */
1393 create_pseudo_type_info (TK_ARRAY_TYPE
, "__array_type_info", NULL
);
1394 create_pseudo_type_info (TK_FUNCTION_TYPE
, "__function_type_info", NULL
);
1395 create_pseudo_type_info (TK_ENUMERAL_TYPE
, "__enum_type_info", NULL
);
1397 /* Class type_info. No additional fields. */
1398 create_pseudo_type_info (TK_CLASS_TYPE
, "__class_type_info", NULL
);
1400 /* Single public non-virtual base class. Add pointer to base class.
1401 This is really a descendant of __class_type_info. */
1402 create_pseudo_type_info (TK_SI_CLASS_TYPE
, "__si_class_type_info",
1403 build_decl (BUILTINS_LOCATION
,
1404 FIELD_DECL
, NULL_TREE
, type_info_ptr_type
),
1407 /* Base class internal helper. Pointer to base type, offset to base,
1412 field
= build_decl (BUILTINS_LOCATION
,
1413 FIELD_DECL
, NULL_TREE
, type_info_ptr_type
);
1416 field
= build_decl (BUILTINS_LOCATION
,
1417 FIELD_DECL
, NULL_TREE
, integer_types
[itk_long
]);
1418 DECL_CHAIN (field
) = fields
;
1421 ti
= VEC_index (tinfo_s
, tinfo_descs
, TK_BASE_TYPE
);
1423 ti
->type
= make_class_type (RECORD_TYPE
);
1424 ti
->vtable
= NULL_TREE
;
1425 ti
->name
= NULL_TREE
;
1426 finish_builtin_struct (ti
->type
, "__base_class_type_info_pseudo",
1430 /* Pointer type_info. Adds two fields, qualification mask
1431 and pointer to the pointed to type. This is really a descendant of
1432 __pbase_type_info. */
1433 create_pseudo_type_info (TK_POINTER_TYPE
, "__pointer_type_info",
1434 build_decl (BUILTINS_LOCATION
,
1435 FIELD_DECL
, NULL_TREE
, integer_type_node
),
1436 build_decl (BUILTINS_LOCATION
,
1437 FIELD_DECL
, NULL_TREE
, type_info_ptr_type
),
1440 /* Pointer to member data type_info. Add qualifications flags,
1441 pointer to the member's type info and pointer to the class.
1442 This is really a descendant of __pbase_type_info. */
1443 create_pseudo_type_info (TK_POINTER_MEMBER_TYPE
,
1444 "__pointer_to_member_type_info",
1445 build_decl (BUILTINS_LOCATION
,
1446 FIELD_DECL
, NULL_TREE
, integer_type_node
),
1447 build_decl (BUILTINS_LOCATION
,
1448 FIELD_DECL
, NULL_TREE
, type_info_ptr_type
),
1449 build_decl (BUILTINS_LOCATION
,
1450 FIELD_DECL
, NULL_TREE
, type_info_ptr_type
),
1453 pop_abi_namespace ();
1456 /* Emit the type_info descriptors which are guaranteed to be in the runtime
1457 support. Generating them here guarantees consistency with the other
1458 structures. We use the following heuristic to determine when the runtime
1459 is being generated. If std::__fundamental_type_info is defined, and its
1460 destructor is defined, then the runtime is being built. */
1463 emit_support_tinfos (void)
1465 /* Dummy static variable so we can put nullptr in the array; it will be
1466 set before we actually start to walk the array. */
1467 static tree
*const fundamentals
[] =
1471 &wchar_type_node
, &char16_type_node
, &char32_type_node
,
1472 &char_type_node
, &signed_char_type_node
, &unsigned_char_type_node
,
1473 &short_integer_type_node
, &short_unsigned_type_node
,
1474 &integer_type_node
, &unsigned_type_node
,
1475 &long_integer_type_node
, &long_unsigned_type_node
,
1476 &long_long_integer_type_node
, &long_long_unsigned_type_node
,
1477 &int128_integer_type_node
, &int128_unsigned_type_node
,
1478 &float_type_node
, &double_type_node
, &long_double_type_node
,
1479 &dfloat32_type_node
, &dfloat64_type_node
, &dfloat128_type_node
,
1484 tree bltn_type
, dtor
;
1486 push_abi_namespace ();
1487 bltn_type
= xref_tag (class_type
,
1488 get_identifier ("__fundamental_type_info"),
1489 /*tag_scope=*/ts_current
, false);
1490 pop_abi_namespace ();
1491 if (!COMPLETE_TYPE_P (bltn_type
))
1493 dtor
= CLASSTYPE_DESTRUCTORS (bltn_type
);
1494 if (!dtor
|| DECL_EXTERNAL (dtor
))
1497 for (ix
= 0; fundamentals
[ix
]; ix
++)
1499 tree bltn
= *fundamentals
[ix
];
1503 if (bltn
== NULL_TREE
)
1506 types
[1] = build_pointer_type (bltn
);
1507 types
[2] = build_pointer_type (cp_build_qualified_type (bltn
,
1510 for (i
= 0; i
< 3; ++i
)
1514 tinfo
= get_tinfo_decl (types
[i
]);
1515 TREE_USED (tinfo
) = 1;
1516 mark_needed (tinfo
);
1517 /* The C++ ABI requires that these objects be COMDAT. But,
1518 On systems without weak symbols, initialized COMDAT
1519 objects are emitted with internal linkage. (See
1520 comdat_linkage for details.) Since we want these objects
1521 to have external linkage so that copies do not have to be
1522 emitted in code outside the runtime library, we make them
1525 It might also not be necessary to follow this detail of the
1527 if (!flag_weak
|| ! targetm
.cxx
.library_rtti_comdat ())
1529 gcc_assert (TREE_PUBLIC (tinfo
) && !DECL_COMDAT (tinfo
));
1530 DECL_INTERFACE_KNOWN (tinfo
) = 1;
1536 /* Finish a type info decl. DECL_PTR is a pointer to an unemitted
1537 tinfo decl. Determine whether it needs emitting, and if so
1538 generate the initializer. */
1541 emit_tinfo_decl (tree decl
)
1543 tree type
= TREE_TYPE (DECL_NAME (decl
));
1544 int in_library
= typeinfo_in_lib_p (type
);
1546 gcc_assert (DECL_TINFO_P (decl
));
1551 DECL_EXTERNAL (decl
) = 0;
1554 /* If we're not in the runtime, then DECL (which is already
1555 DECL_EXTERNAL) will not be defined here. */
1556 DECL_INTERFACE_KNOWN (decl
) = 1;
1560 else if (involves_incomplete_p (type
))
1562 if (!decl_needed_p (decl
))
1564 /* If TYPE involves an incomplete class type, then the typeinfo
1565 object will be emitted with internal linkage. There is no
1566 way to know whether or not types are incomplete until the end
1567 of the compilation, so this determination must be deferred
1568 until this point. */
1569 TREE_PUBLIC (decl
) = 0;
1570 DECL_EXTERNAL (decl
) = 0;
1571 DECL_INTERFACE_KNOWN (decl
) = 1;
1574 import_export_decl (decl
);
1575 if (DECL_NOT_REALLY_EXTERN (decl
) && decl_needed_p (decl
))
1579 DECL_EXTERNAL (decl
) = 0;
1580 init
= get_pseudo_ti_init (type
, get_pseudo_ti_index (type
));
1581 DECL_INITIAL (decl
) = init
;
1583 cp_finish_decl (decl
, init
, false, NULL_TREE
, 0);
1590 #include "gt-cp-rtti.h"