Line data Source code
1 : /* RunTime Type Identification
2 : Copyright (C) 1995-2026 Free Software Foundation, Inc.
3 : Mostly written by Jason Merrill (jason@cygnus.com).
4 :
5 : This file is part of GCC.
6 :
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)
10 : any later version.
11 :
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.
16 :
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/>. */
20 :
21 : #include "config.h"
22 : #include "system.h"
23 : #include "coretypes.h"
24 : #include "target.h"
25 : #include "cp-tree.h"
26 : #include "memmodel.h"
27 : #include "tm_p.h"
28 : #include "stringpool.h"
29 : #include "intl.h"
30 : #include "stor-layout.h"
31 : #include "c-family/c-pragma.h"
32 : #include "gcc-rich-location.h"
33 :
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.
43 :
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.
53 :
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. */
62 :
63 : /* Auxiliary data we hold for each type_info derived object we need. */
64 : struct GTY (()) tinfo_s {
65 : tree type; /* The (const-qualified) RECORD_TYPE for this type_info object */
66 :
67 : tree vtable; /* The VAR_DECL of the vtable. Only filled at end of
68 : translation. */
69 :
70 : tree name; /* IDENTIFIER_NODE for the ABI specified name of
71 : the type_info derived type. */
72 : };
73 :
74 :
75 : enum tinfo_kind
76 : {
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> */
89 : TK_MAX
90 : };
91 :
92 : /* Names of the tinfo types. Must be same order as TK enumeration
93 : above. */
94 :
95 : static const char *const tinfo_names[TK_MAX] =
96 : {
97 : "__type_info",
98 : "__base_class_type_info",
99 : "__fundamental_type_info",
100 : "__array_type_info",
101 : "__function_type_info",
102 : "__enum_type_info",
103 : "__pointer_type_info",
104 : "__pointer_to_member_type_info",
105 : "__class_type_info",
106 : "__si_class_type_info",
107 : "__vmi_class_type_info"
108 : };
109 :
110 : /* Helper macro to get maximum scalar-width of pointer or of the 'long'-type.
111 : This of interest for llp64 targets. */
112 : #define LONGPTR_T \
113 : integer_types[(POINTER_SIZE <= TYPE_PRECISION (integer_types[itk_long]) \
114 : ? itk_long : itk_long_long)]
115 :
116 : /* A vector of all tinfo decls that haven't yet been emitted. */
117 : vec<tree, va_gc> *unemitted_tinfo_decls;
118 :
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;
123 :
124 : static tree tinfo_name (tree, bool);
125 : static tree build_dynamic_cast_1 (location_t, tree, tree, tsubst_flags_t);
126 : static tree throw_bad_cast (void);
127 : static tree throw_bad_typeid (void);
128 : static bool typeid_ok_p (void);
129 : static int qualifier_flags (tree);
130 : static bool target_incomplete_p (tree);
131 : static tree tinfo_base_init (tinfo_s *, tree);
132 : static tree generic_initializer (tinfo_s *, tree);
133 : static tree ptr_initializer (tinfo_s *, tree);
134 : static tree ptm_initializer (tinfo_s *, tree);
135 : static tree class_initializer (tinfo_s *, tree, unsigned, ...);
136 : static tree get_pseudo_ti_init (tree, unsigned);
137 : static unsigned get_pseudo_ti_index (tree);
138 : static tinfo_s *get_tinfo_desc (unsigned);
139 : static void create_tinfo_types (void);
140 : static bool typeinfo_in_lib_p (tree);
141 :
142 : static int doing_runtime = 0;
143 :
144 : /* Create the internal versions of the ABI types. */
145 :
146 : void
147 97402 : init_rtti_processing (void)
148 : {
149 97402 : vec_alloc (unemitted_tinfo_decls, 124);
150 :
151 97402 : create_tinfo_types ();
152 97402 : }
153 :
154 : /* Given the expression EXP of type `class *', return the head of the
155 : object pointed to by EXP with type cv void*, if the class has any
156 : virtual functions (TYPE_POLYMORPHIC_P), else just return the
157 : expression. */
158 :
159 : tree
160 526 : build_headof (tree exp)
161 : {
162 526 : tree type = TREE_TYPE (exp);
163 526 : tree offset;
164 526 : tree index;
165 :
166 526 : gcc_assert (TYPE_PTR_P (type));
167 526 : type = TREE_TYPE (type);
168 :
169 526 : if (!CLASS_TYPE_P (type) || !TYPE_POLYMORPHIC_P (type))
170 : return exp;
171 :
172 : /* We use this a couple of times below, protect it. */
173 502 : exp = save_expr (exp);
174 :
175 : /* The offset-to-top field is at index -2 from the vptr. */
176 502 : index = build_int_cst (NULL_TREE,
177 : -2 * TARGET_VTABLE_DATA_ENTRY_DISTANCE);
178 :
179 502 : offset = build_vtbl_ref (cp_build_fold_indirect_ref (exp),
180 : index);
181 :
182 502 : cp_build_qualified_type (ptr_type_node,
183 502 : cp_type_quals (TREE_TYPE (exp)));
184 502 : return fold_build_pointer_plus (exp, offset);
185 : }
186 :
187 : /* Get a bad_cast node for the program to throw...
188 :
189 : See 'libstdc++-v3/libsupc++/eh_aux_runtime.cc' for '__cxa_bad_cast'. */
190 :
191 : static tree
192 227 : throw_bad_cast (void)
193 : {
194 227 : static tree fn;
195 227 : if (!fn)
196 : {
197 92 : tree name = get_identifier ("__cxa_bad_cast");
198 92 : fn = get_global_binding (name);
199 92 : if (!fn)
200 92 : fn = push_throw_library_fn
201 92 : (name, build_function_type_list (void_type_node, NULL_TREE));
202 : }
203 :
204 227 : return build_cxx_call (fn, 0, NULL, tf_warning_or_error);
205 : }
206 :
207 : /* See 'libstdc++-v3/libsupc++/eh_aux_runtime.cc' for '__cxa_bad_typeid'. */
208 :
209 : static tree
210 127 : throw_bad_typeid (void)
211 : {
212 127 : static tree fn;
213 127 : if (!fn)
214 : {
215 47 : tree name = get_identifier ("__cxa_bad_typeid");
216 47 : fn = get_global_binding (name);
217 47 : if (!fn)
218 47 : fn = push_throw_library_fn
219 47 : (name, build_function_type_list (void_type_node, NULL_TREE));
220 : }
221 :
222 127 : return build_cxx_call (fn, 0, NULL, tf_warning_or_error);
223 : }
224 :
225 : /* const type_info*. */
226 :
227 : inline tree
228 82377 : type_info_ptr_type ()
229 : {
230 82377 : return build_pointer_type (const_type_info_type_node);
231 : }
232 :
233 : /* Return a pointer to a type_info object describing TYPE, suitably
234 : cast to the language defined type (for typeid) or void (for building
235 : up the descriptors). */
236 :
237 : static tree
238 510605 : get_tinfo_ptr (tree type, bool voidp = false)
239 : {
240 510605 : tree decl = get_tinfo_decl (type);
241 510605 : mark_used (decl);
242 :
243 510605 : tree ptype = voidp ? const_ptr_type_node : type_info_ptr_type ();
244 510605 : return build_nop (ptype, build_address (decl));
245 : }
246 : static inline tree
247 428637 : get_void_tinfo_ptr (tree type)
248 : {
249 428637 : return get_tinfo_ptr (type, true);
250 : }
251 :
252 : /* Return an lvalue expression whose type is "const std::type_info"
253 : and whose value indicates the type of the expression EXP. If EXP
254 : is a reference to a polymorphic class, return the dynamic type;
255 : otherwise return the static type of the expression. */
256 :
257 : static tree
258 1073 : get_tinfo_ptr_dynamic (tree exp, tsubst_flags_t complain)
259 : {
260 1073 : tree type;
261 1073 : tree t;
262 :
263 1073 : if (error_operand_p (exp))
264 3 : return error_mark_node;
265 :
266 1070 : exp = resolve_nondeduced_context (exp, complain);
267 :
268 : /* Peel back references, so they match. */
269 1070 : type = non_reference (unlowered_expr_type (exp));
270 :
271 : /* Peel off cv qualifiers. */
272 1070 : type = cv_unqualified (type);
273 :
274 : /* For UNKNOWN_TYPEs call complete_type_or_else to get diagnostics. */
275 1070 : if (CLASS_TYPE_P (type) || type == unknown_type_node
276 1449 : || type == init_list_type_node)
277 691 : type = complete_type_or_maybe_complain (type, exp, complain);
278 :
279 1070 : if (!type)
280 12 : return error_mark_node;
281 :
282 : /* If exp is a reference to polymorphic type, get the real type_info. */
283 706 : if (CLASS_TYPE_P (type)
284 679 : && TYPE_POLYMORPHIC_P (type)
285 1521 : && ! resolves_to_fixed_type_p (exp, 0))
286 : {
287 : /* build reference to type_info from vtable. */
288 409 : tree index;
289 :
290 : /* The RTTI information is at index -1. */
291 409 : index = build_int_cst (NULL_TREE,
292 : -1 * TARGET_VTABLE_DATA_ENTRY_DISTANCE);
293 409 : t = build_vtbl_ref (exp, index);
294 409 : t = convert (type_info_ptr_type (), t);
295 : }
296 : else
297 : /* Otherwise return the type_info for the static type of the expr. */
298 649 : t = get_tinfo_ptr (type);
299 :
300 : return t;
301 : }
302 :
303 : static bool
304 219293 : typeid_ok_p (void)
305 : {
306 219293 : if (! flag_rtti)
307 : {
308 3 : error ("cannot use %<typeid%> with %<-fno-rtti%>");
309 3 : return false;
310 : }
311 :
312 219290 : if (!const_type_info_type_node)
313 : {
314 12225 : tree name = get_identifier ("type_info");
315 12225 : tree decl = lookup_qualified_name (std_node, name);
316 12225 : if (TREE_CODE (decl) != TYPE_DECL)
317 : {
318 3 : gcc_rich_location richloc (input_location);
319 3 : maybe_add_include_fixit (&richloc, "<typeinfo>", false);
320 3 : error_at (&richloc,
321 : "must %<#include <typeinfo>%> before using"
322 : " %<typeid%>");
323 :
324 3 : return false;
325 3 : }
326 12222 : const_type_info_type_node
327 12222 : = cp_build_qualified_type (TREE_TYPE (decl), TYPE_QUAL_CONST);
328 : }
329 :
330 219287 : tree pseudo = TYPE_MAIN_VARIANT (get_tinfo_desc (TK_TYPE_INFO_TYPE)->type);
331 219287 : tree real = TYPE_MAIN_VARIANT (const_type_info_type_node);
332 :
333 : /* Make sure abi::__type_info_pseudo has the same alias set
334 : as std::type_info. */
335 219287 : if (! TYPE_ALIAS_SET_KNOWN_P (pseudo))
336 12222 : TYPE_ALIAS_SET (pseudo) = get_alias_set (real);
337 : else
338 207065 : gcc_assert (TYPE_ALIAS_SET (pseudo) == get_alias_set (real));
339 :
340 : return true;
341 : }
342 :
343 : /* Return an expression for "typeid(EXP)". The expression returned is
344 : an lvalue of type "const std::type_info". */
345 :
346 : tree
347 11771 : build_typeid (tree exp, tsubst_flags_t complain)
348 : {
349 11771 : tree cond = NULL_TREE, initial_expr = exp;
350 11771 : int nonnull = 0;
351 :
352 11771 : if (exp == error_mark_node || !typeid_ok_p ())
353 26 : return error_mark_node;
354 :
355 11745 : if (processing_template_decl)
356 10672 : return build_min (TYPEID_EXPR, const_type_info_type_node, exp);
357 :
358 2146 : if (CLASS_TYPE_P (TREE_TYPE (exp))
359 679 : && TYPE_POLYMORPHIC_P (TREE_TYPE (exp))
360 462 : && ! resolves_to_fixed_type_p (exp, &nonnull)
361 1481 : && ! nonnull)
362 : {
363 : /* So we need to look into the vtable of the type of exp.
364 : Make sure it isn't a null lvalue. */
365 127 : exp = cp_build_addr_expr (exp, complain);
366 127 : exp = save_expr (exp);
367 127 : cond = cp_convert (boolean_type_node, exp, complain);
368 127 : exp = cp_build_fold_indirect_ref (exp);
369 : }
370 :
371 1073 : exp = get_tinfo_ptr_dynamic (exp, complain);
372 :
373 1073 : if (exp == error_mark_node)
374 : return error_mark_node;
375 :
376 1052 : if (cond)
377 : {
378 127 : tree bad = throw_bad_typeid ();
379 :
380 127 : exp = build3 (COND_EXPR, TREE_TYPE (exp), cond, exp, bad);
381 : }
382 : else
383 925 : mark_type_use (initial_expr);
384 :
385 1052 : return cp_build_fold_indirect_ref (exp);
386 : }
387 :
388 : /* Generate the NTBS name of a type. If MARK_PRIVATE, put a '*' in front so that
389 : comparisons will be done by pointer rather than string comparison. */
390 : static tree
391 507140 : tinfo_name (tree type, bool mark_private)
392 : {
393 507140 : const char *name;
394 507140 : int length;
395 507140 : tree name_string;
396 :
397 507140 : name = mangle_type_string (type);
398 507140 : length = strlen (name);
399 :
400 507140 : if (mark_private)
401 : {
402 : /* Inject '*' at beginning of name to force pointer comparison. */
403 917 : char* buf = (char*) XALLOCAVEC (char, length + 2);
404 917 : buf[0] = '*';
405 917 : memcpy (buf + 1, name, length + 1);
406 917 : name_string = build_string (length + 2, buf);
407 : }
408 : else
409 506223 : name_string = build_string (length + 1, name);
410 :
411 507140 : return fix_string_type (name_string);
412 : }
413 :
414 : /* Return a VAR_DECL for the internal ABI defined type_info object for
415 : TYPE. You must arrange that the decl is mark_used, if actually use
416 : it --- decls in vtables are only used if the vtable is output. */
417 :
418 : tree
419 3351302 : get_tinfo_decl (tree type)
420 : {
421 3351302 : if (variably_modified_type_p (type, /*fn=*/NULL_TREE))
422 : {
423 9 : error ("cannot create type information for type %qT because "
424 : "it involves types of variable size",
425 : type);
426 9 : return error_mark_node;
427 : }
428 :
429 3351293 : if (TREE_CODE (type) == METHOD_TYPE)
430 47 : type = build_function_type (TREE_TYPE (type),
431 47 : TREE_CHAIN (TYPE_ARG_TYPES (type)));
432 :
433 3351293 : return get_tinfo_decl_direct (type, NULL, -1);
434 : }
435 :
436 : /* Get or create a tinfo VAR_DECL directly from the provided information.
437 : The caller must have already checked it is valid to do so. */
438 :
439 : tree
440 3354166 : get_tinfo_decl_direct (tree type, tree name, int pseudo_ix)
441 : {
442 : /* For a class type, the variable is cached in the type node
443 : itself. */
444 3354166 : tree d = NULL_TREE;
445 :
446 3354166 : gcc_checking_assert (TREE_CODE (type) != METHOD_TYPE);
447 :
448 3354166 : if (CLASS_TYPE_P (type))
449 3335937 : d = CLASSTYPE_TYPEINFO_VAR (TYPE_MAIN_VARIANT (type));
450 :
451 3354166 : if (!name)
452 3351293 : name = mangle_typeinfo_for_type (type);
453 :
454 3354166 : if (!CLASS_TYPE_P (type) || TYPE_TRANSPARENT_AGGR (type))
455 18268 : d = get_global_binding (name);
456 :
457 3354166 : if (!d)
458 : {
459 : /* Create it. */
460 1913480 : if (pseudo_ix < 0)
461 1912026 : pseudo_ix = get_pseudo_ti_index (type);
462 :
463 1913480 : const tinfo_s *ti = get_tinfo_desc (pseudo_ix);
464 :
465 1913480 : d = build_lang_decl (VAR_DECL, name, ti->type);
466 1913480 : SET_DECL_ASSEMBLER_NAME (d, name);
467 : /* Remember the type it is for. */
468 1913480 : TREE_TYPE (name) = type;
469 1913480 : DECL_TINFO_P (d) = 1;
470 1913480 : DECL_ARTIFICIAL (d) = 1;
471 1913480 : DECL_IGNORED_P (d) = 1;
472 1913480 : TREE_READONLY (d) = 1;
473 1913480 : TREE_STATIC (d) = 1;
474 1913480 : TREE_ADDRESSABLE (d) = 1;
475 : /* Tell equal_address_to that different tinfo decls never
476 : overlap. */
477 1913480 : if (vec_safe_is_empty (unemitted_tinfo_decls))
478 21490 : DECL_ATTRIBUTES (d)
479 42980 : = build_tree_list (get_identifier ("non overlapping"),
480 : NULL_TREE);
481 : else
482 3783980 : DECL_ATTRIBUTES (d)
483 1891990 : = DECL_ATTRIBUTES ((*unemitted_tinfo_decls)[0]);
484 :
485 : /* Mark the variable as undefined -- but remember that we can
486 : define it later if we need to do so. */
487 1913480 : DECL_EXTERNAL (d) = 1;
488 1913480 : DECL_NOT_REALLY_EXTERN (d) = 1;
489 1913480 : set_linkage_according_to_type (type, d);
490 :
491 1913480 : d = pushdecl_top_level_and_finish (d, NULL_TREE);
492 1913480 : if (CLASS_TYPE_P (type))
493 1900551 : CLASSTYPE_TYPEINFO_VAR (TYPE_MAIN_VARIANT (type)) = d;
494 :
495 : /* Add decl to the global array of tinfo decls. */
496 1913480 : vec_safe_push (unemitted_tinfo_decls, d);
497 : }
498 :
499 3354166 : return d;
500 : }
501 :
502 : /* Return the type_info object for TYPE. */
503 :
504 : tree
505 207551 : get_typeid (tree type, tsubst_flags_t complain)
506 : {
507 207551 : if (type == error_mark_node || !typeid_ok_p ())
508 9 : return error_mark_node;
509 :
510 207542 : if (processing_template_decl)
511 126220 : return build_min (TYPEID_EXPR, const_type_info_type_node, type);
512 :
513 : /* If the type of the type-id is a reference type, the result of the
514 : typeid expression refers to a type_info object representing the
515 : referenced type. */
516 81322 : type = non_reference (type);
517 :
518 : /* This is not one of the uses of a qualified function type in 8.3.5. */
519 81322 : if (TREE_CODE (type) == FUNCTION_TYPE
520 81322 : && (type_memfn_quals (type) != TYPE_UNQUALIFIED
521 8 : || type_memfn_rqual (type) != REF_QUAL_NONE))
522 : {
523 3 : if (complain & tf_error)
524 3 : error ("%<typeid%> of qualified function type %qT", type);
525 3 : return error_mark_node;
526 : }
527 :
528 : /* The top-level cv-qualifiers of the lvalue expression or the type-id
529 : that is the operand of typeid are always ignored. */
530 81319 : type = cv_unqualified (type);
531 :
532 : /* For UNKNOWN_TYPEs call complete_type_or_else to get diagnostics. */
533 81319 : if (CLASS_TYPE_P (type) || type == unknown_type_node
534 91215 : || type == init_list_type_node)
535 71423 : type = complete_type_or_maybe_complain (type, NULL_TREE, complain);
536 :
537 81319 : if (!type)
538 0 : return error_mark_node;
539 :
540 81319 : return cp_build_fold_indirect_ref (get_tinfo_ptr (type));
541 : }
542 :
543 : /* Check whether TEST is null before returning RESULT. If TEST is used in
544 : RESULT, it must have previously had a save_expr applied to it. */
545 :
546 : tree
547 23862 : build_if_nonnull (tree test, tree result, tsubst_flags_t complain)
548 : {
549 23862 : tree null_ptr = cp_convert (TREE_TYPE (test), nullptr_node, complain);
550 23862 : tree cond = build2 (NE_EXPR, boolean_type_node, test, null_ptr);
551 :
552 : /* This is a compiler generated comparison, don't emit
553 : e.g. -Wnonnull-compare warning for it. */
554 23862 : suppress_warning (cond, OPT_Wnonnull);
555 :
556 23862 : null_ptr = cp_convert (TREE_TYPE (result), nullptr_node, complain);
557 23862 : cond = build3 (COND_EXPR, TREE_TYPE (result), cond, result, null_ptr);
558 :
559 : /* Likewise, don't emit -Wnonnull for using the result to call
560 : a member function. */
561 23862 : suppress_warning (cond, OPT_Wnonnull);
562 23862 : return cond;
563 : }
564 :
565 : /* Execute a dynamic cast, as described in section 5.2.6 of the 9/93 working
566 : paper. */
567 :
568 : static tree
569 22629 : build_dynamic_cast_1 (location_t loc, tree type, tree expr,
570 : tsubst_flags_t complain)
571 : {
572 22629 : enum tree_code tc = TREE_CODE (type);
573 22629 : tree exprtype;
574 22629 : tree dcast_fn;
575 22629 : tree old_expr = expr;
576 22629 : const char *errstr = NULL;
577 :
578 : /* Save casted types in the function's used types hash table. */
579 22629 : used_types_insert (type);
580 :
581 : /* T shall be a pointer or reference to a complete class type, or
582 : `pointer to cv void''. */
583 22629 : switch (tc)
584 : {
585 22279 : case POINTER_TYPE:
586 22279 : if (VOID_TYPE_P (TREE_TYPE (type)))
587 : break;
588 : /* Fall through. */
589 22118 : case REFERENCE_TYPE:
590 22118 : if (! MAYBE_CLASS_TYPE_P (TREE_TYPE (type)))
591 : {
592 0 : errstr = _("target is not pointer or reference to class");
593 0 : goto fail;
594 : }
595 22118 : if (!COMPLETE_TYPE_P (complete_type (TREE_TYPE (type))))
596 : {
597 0 : errstr = _("target is not pointer or reference to complete type");
598 0 : goto fail;
599 : }
600 : break;
601 :
602 12 : default:
603 12 : errstr = _("target is not pointer or reference");
604 12 : goto fail;
605 : }
606 :
607 22617 : if (tc == POINTER_TYPE)
608 : {
609 22279 : expr = decay_conversion (expr, complain);
610 22279 : exprtype = TREE_TYPE (expr);
611 :
612 : /* If T is a pointer type, v shall be an rvalue of a pointer to
613 : complete class type, and the result is an rvalue of type T. */
614 :
615 22279 : expr = mark_rvalue_use (expr);
616 :
617 22279 : if (!TYPE_PTR_P (exprtype))
618 : {
619 0 : errstr = _("source is not a pointer");
620 0 : goto fail;
621 : }
622 22279 : if (! MAYBE_CLASS_TYPE_P (TREE_TYPE (exprtype)))
623 : {
624 3 : errstr = _("source is not a pointer to class");
625 3 : goto fail;
626 : }
627 22276 : if (!COMPLETE_TYPE_P (complete_type (TREE_TYPE (exprtype))))
628 : {
629 0 : errstr = _("source is a pointer to incomplete type");
630 0 : goto fail;
631 : }
632 : }
633 : else
634 : {
635 338 : expr = mark_lvalue_use (expr);
636 338 : exprtype = TREE_TYPE (expr);
637 :
638 : /* T is a reference type, v shall be an lvalue of a complete class
639 : type, and the result is an lvalue of the type referred to by T. */
640 338 : if (! MAYBE_CLASS_TYPE_P (exprtype))
641 : {
642 3 : errstr = _("source is not of class type");
643 3 : goto fail;
644 : }
645 335 : if (!COMPLETE_TYPE_P (complete_type (exprtype)))
646 : {
647 0 : errstr = _("source is of incomplete class type");
648 0 : goto fail;
649 : }
650 :
651 335 : exprtype = cp_build_reference_type (exprtype, !lvalue_p (expr));
652 : }
653 :
654 : /* The dynamic_cast operator shall not cast away constness. */
655 22611 : if (!at_least_as_qualified_p (TREE_TYPE (type),
656 22611 : TREE_TYPE (exprtype)))
657 : {
658 12 : errstr = _("conversion casts away constness");
659 12 : goto fail;
660 : }
661 :
662 : /* If *type is an unambiguous accessible base class of *exprtype,
663 : convert statically. */
664 22599 : {
665 22599 : tree binfo = lookup_base (TREE_TYPE (exprtype), TREE_TYPE (type),
666 : ba_check, NULL, complain);
667 22599 : if (binfo)
668 399 : return build_static_cast (loc, type, expr, complain);
669 : }
670 :
671 : /* Apply trivial conversion T -> T& for dereferenced ptrs. */
672 22200 : if (tc == REFERENCE_TYPE)
673 227 : expr = convert_to_reference (exprtype, expr, CONV_IMPLICIT,
674 : LOOKUP_NORMAL, NULL_TREE, complain);
675 :
676 : /* Otherwise *exprtype must be a polymorphic class (have a vtbl). */
677 22200 : if (TYPE_POLYMORPHIC_P (TREE_TYPE (exprtype)))
678 : {
679 22197 : tree expr1;
680 : /* if TYPE is `void *', return pointer to complete object. */
681 22197 : if (tc == POINTER_TYPE && VOID_TYPE_P (TREE_TYPE (type)))
682 : {
683 : /* if b is an object, dynamic_cast<void *>(&b) == (void *)&b. */
684 490 : if (TREE_CODE (expr) == ADDR_EXPR
685 0 : && VAR_P (TREE_OPERAND (expr, 0))
686 490 : && TREE_CODE (TREE_TYPE (TREE_OPERAND (expr, 0))) == RECORD_TYPE)
687 0 : return build1 (NOP_EXPR, type, expr);
688 :
689 : /* Since expr is used twice below, save it. */
690 490 : expr = save_expr (expr);
691 :
692 490 : expr1 = build_headof (expr);
693 490 : if (TREE_TYPE (expr1) != type)
694 490 : expr1 = build1 (NOP_EXPR, type, expr1);
695 490 : return build_if_nonnull (expr, expr1, complain);
696 : }
697 : else
698 : {
699 21707 : tree retval;
700 21707 : tree result, td2, td3;
701 21707 : tree elems[4];
702 21707 : tree static_type, target_type, boff;
703 :
704 : /* If we got here, we can't convert statically. Therefore,
705 : dynamic_cast<D&>(b) (b an object) cannot succeed. */
706 21707 : if (tc == REFERENCE_TYPE)
707 : {
708 227 : if (VAR_P (old_expr)
709 227 : && TREE_CODE (TREE_TYPE (old_expr)) == RECORD_TYPE)
710 : {
711 0 : tree expr = throw_bad_cast ();
712 0 : if (complain & tf_warning)
713 0 : warning_at (loc, 0,
714 : "%<dynamic_cast<%#T>(%#D)%> can never succeed",
715 : type, old_expr);
716 : /* Bash it to the expected type. */
717 0 : TREE_TYPE (expr) = type;
718 0 : return expr;
719 : }
720 : }
721 : /* Ditto for dynamic_cast<D*>(&b). */
722 21480 : else if (TREE_CODE (expr) == ADDR_EXPR)
723 : {
724 3 : tree op = TREE_OPERAND (expr, 0);
725 3 : if (VAR_P (op)
726 3 : && TREE_CODE (TREE_TYPE (op)) == RECORD_TYPE)
727 : {
728 3 : if (complain & tf_warning)
729 3 : warning_at (loc, 0,
730 : "%<dynamic_cast<%#T>(%#D)%> can never succeed",
731 : type, op);
732 3 : retval = build_int_cst (type, 0);
733 3 : return retval;
734 : }
735 : }
736 :
737 : /* Use of dynamic_cast when -fno-rtti is prohibited. */
738 21704 : if (!flag_rtti)
739 : {
740 3 : if (complain & tf_error)
741 3 : error_at (loc,
742 : "%<dynamic_cast%> not permitted with %<-fno-rtti%>");
743 3 : return error_mark_node;
744 : }
745 :
746 21701 : target_type = TYPE_MAIN_VARIANT (TREE_TYPE (type));
747 21701 : static_type = TYPE_MAIN_VARIANT (TREE_TYPE (exprtype));
748 21701 : td2 = get_tinfo_decl (target_type);
749 21701 : if (!mark_used (td2, complain) && !(complain & tf_error))
750 0 : return error_mark_node;
751 21701 : td2 = cp_build_addr_expr (td2, complain);
752 21701 : td3 = get_tinfo_decl (static_type);
753 21701 : if (!mark_used (td3, complain) && !(complain & tf_error))
754 0 : return error_mark_node;
755 21701 : td3 = cp_build_addr_expr (td3, complain);
756 :
757 : /* Determine how T and V are related. */
758 21701 : boff = dcast_base_hint (static_type, target_type);
759 :
760 : /* Since expr is used twice below, save it. */
761 21701 : expr = save_expr (expr);
762 :
763 21701 : expr1 = expr;
764 21701 : if (tc == REFERENCE_TYPE)
765 227 : expr1 = cp_build_addr_expr (expr1, complain);
766 :
767 21701 : elems[0] = expr1;
768 21701 : elems[1] = td3;
769 21701 : elems[2] = td2;
770 21701 : elems[3] = boff;
771 :
772 21701 : dcast_fn = dynamic_cast_node;
773 21701 : if (!dcast_fn)
774 : {
775 9611 : unsigned flags = push_abi_namespace ();
776 9611 : tree tinfo_ptr = xref_tag (class_type,
777 : get_identifier ("__class_type_info"));
778 9611 : tinfo_ptr = cp_build_qualified_type (tinfo_ptr, TYPE_QUAL_CONST);
779 9611 : tinfo_ptr = build_pointer_type (tinfo_ptr);
780 :
781 9611 : const char *fn_name = "__dynamic_cast";
782 : /* void *() (void const *, __class_type_info const *,
783 : __class_type_info const *, ptrdiff_t) */
784 9611 : tree fn_type = (build_function_type_list
785 9611 : (ptr_type_node, const_ptr_type_node,
786 : tinfo_ptr, tinfo_ptr, ptrdiff_type_node,
787 : NULL_TREE));
788 9611 : dcast_fn = (build_library_fn_ptr
789 9611 : (fn_name, fn_type, ECF_LEAF | ECF_PURE | ECF_NOTHROW));
790 : /* As with __cxa_atexit in get_atexit_node. */
791 9611 : DECL_CONTEXT (dcast_fn) = FROB_CONTEXT (current_namespace);
792 9611 : DECL_SOURCE_LOCATION (dcast_fn) = BUILTINS_LOCATION;
793 9611 : dcast_fn = pushdecl (dcast_fn, /*hiding=*/true);
794 9611 : pop_abi_namespace (flags);
795 9611 : dynamic_cast_node = dcast_fn;
796 : }
797 21701 : if (dcast_fn == error_mark_node)
798 : return error_mark_node;
799 21698 : result = build_cxx_call (dcast_fn, 4, elems, complain);
800 21698 : SET_EXPR_LOCATION (result, loc);
801 :
802 21698 : if (tc == REFERENCE_TYPE)
803 : {
804 227 : tree bad = throw_bad_cast ();
805 227 : tree neq;
806 :
807 227 : result = save_expr (result);
808 227 : neq = cp_truthvalue_conversion (result, complain);
809 227 : return cp_convert (type,
810 227 : build3 (COND_EXPR, TREE_TYPE (result),
811 227 : neq, result, bad), complain);
812 : }
813 :
814 : /* Now back to the type we want from a void*. */
815 21471 : result = cp_convert (type, result, complain);
816 21471 : return build_if_nonnull (expr, result, complain);
817 : }
818 : }
819 : else
820 3 : errstr = _("source type is not polymorphic");
821 :
822 33 : fail:
823 33 : if (complain & tf_error)
824 18 : error_at (loc, "cannot %<dynamic_cast%> %qE (of type %q#T) "
825 : "to type %q#T (%s)",
826 18 : old_expr, TREE_TYPE (old_expr), type, errstr);
827 33 : return error_mark_node;
828 : }
829 :
830 : tree
831 84456 : build_dynamic_cast (location_t loc, tree type, tree expr,
832 : tsubst_flags_t complain)
833 : {
834 84456 : tree r;
835 :
836 84456 : if (type == error_mark_node || expr == error_mark_node)
837 : return error_mark_node;
838 :
839 84451 : if (processing_template_decl)
840 : {
841 61822 : expr = build_min (DYNAMIC_CAST_EXPR, type, expr);
842 61822 : TREE_SIDE_EFFECTS (expr) = 1;
843 61822 : r = convert_from_reference (expr);
844 61822 : protected_set_expr_location (r, loc);
845 61822 : return r;
846 : }
847 :
848 22629 : r = convert_from_reference (build_dynamic_cast_1 (loc, type, expr,
849 : complain));
850 22629 : if (r != error_mark_node)
851 22584 : maybe_warn_about_useless_cast (loc, type, expr, complain);
852 22629 : protected_set_expr_location (r, loc);
853 22629 : return r;
854 : }
855 :
856 : /* Return the runtime bit mask encoding the qualifiers of TYPE. */
857 :
858 : static int
859 1046 : qualifier_flags (tree type)
860 : {
861 1046 : int flags = 0;
862 1046 : int quals = cp_type_quals (type);
863 :
864 1046 : if (quals & TYPE_QUAL_CONST)
865 231 : flags |= 1;
866 1046 : if (quals & TYPE_QUAL_VOLATILE)
867 6 : flags |= 2;
868 1046 : if (quals & TYPE_QUAL_RESTRICT)
869 6 : flags |= 4;
870 1046 : return flags;
871 : }
872 :
873 : /* Return true, if the pointer chain TYPE ends at an incomplete type, or
874 : contains a pointer to member of an incomplete class. */
875 :
876 : static bool
877 1756 : target_incomplete_p (tree type)
878 : {
879 1948 : while (true)
880 1948 : if (TYPE_PTRDATAMEM_P (type))
881 : {
882 16 : if (!COMPLETE_TYPE_P (TYPE_PTRMEM_CLASS_TYPE (type)))
883 : return true;
884 10 : type = TYPE_PTRMEM_POINTED_TO_TYPE (type);
885 : }
886 1932 : else if (TYPE_PTR_P (type))
887 182 : type = TREE_TYPE (type);
888 : else
889 1750 : return !COMPLETE_OR_VOID_TYPE_P (type);
890 : }
891 :
892 : /* Returns true if TYPE involves an incomplete class type; in that
893 : case, typeinfo variables for TYPE should be emitted with internal
894 : linkage. */
895 :
896 : static bool
897 5853741 : involves_incomplete_p (tree type)
898 : {
899 5853741 : switch (TREE_CODE (type))
900 : {
901 617 : case POINTER_TYPE:
902 617 : return target_incomplete_p (TREE_TYPE (type));
903 :
904 93 : case OFFSET_TYPE:
905 93 : ptrmem:
906 93 : return
907 93 : (target_incomplete_p (TYPE_PTRMEM_POINTED_TO_TYPE (type))
908 93 : || !COMPLETE_TYPE_P (TYPE_PTRMEM_CLASS_TYPE (type)));
909 :
910 5852916 : case RECORD_TYPE:
911 5852916 : if (TYPE_PTRMEMFUNC_P (type))
912 47 : goto ptrmem;
913 : /* Fall through. */
914 5852869 : case UNION_TYPE:
915 5852869 : if (!COMPLETE_TYPE_P (type))
916 : return true;
917 : /* Fall through. */
918 : default:
919 : /* All other types do not involve incomplete class types. */
920 : return false;
921 : }
922 : }
923 :
924 : /* Return a CONSTRUCTOR for the common part of the type_info objects. This
925 : is the vtable pointer and NTBS name. The NTBS name is emitted as a
926 : comdat const char array, so it becomes a unique key for the type. Generate
927 : and emit that VAR_DECL here. (We can't always emit the type_info itself
928 : as comdat, because of pointers to incomplete.) */
929 :
930 : static tree
931 507140 : tinfo_base_init (tinfo_s *ti, tree target)
932 : {
933 507140 : tree init;
934 507140 : tree name_decl;
935 507140 : tree vtable_ptr;
936 507140 : vec<constructor_elt, va_gc> *v;
937 :
938 507140 : {
939 507140 : tree name_name, name_string;
940 :
941 : /* Generate the NTBS array variable. */
942 507140 : tree name_type = build_cplus_array_type
943 507140 : (cp_build_qualified_type (char_type_node, TYPE_QUAL_CONST),
944 : NULL_TREE);
945 :
946 : /* Determine the name of the variable -- and remember with which
947 : type it is associated. */
948 507140 : name_name = mangle_typeinfo_string_for_type (target);
949 507140 : TREE_TYPE (name_name) = target;
950 :
951 507140 : name_decl = build_lang_decl (VAR_DECL, name_name, name_type);
952 507140 : SET_DECL_ASSEMBLER_NAME (name_decl, name_name);
953 507140 : DECL_ARTIFICIAL (name_decl) = 1;
954 507140 : DECL_IGNORED_P (name_decl) = 1;
955 507140 : TREE_READONLY (name_decl) = 1;
956 507140 : TREE_STATIC (name_decl) = 1;
957 507140 : DECL_EXTERNAL (name_decl) = 0;
958 507140 : DECL_TINFO_P (name_decl) = 1;
959 507140 : set_linkage_according_to_type (target, name_decl);
960 507140 : import_export_decl (name_decl);
961 507140 : name_string = tinfo_name (target, !TREE_PUBLIC (name_decl));
962 507140 : DECL_INITIAL (name_decl) = name_string;
963 507140 : mark_used (name_decl);
964 507140 : pushdecl_top_level_and_finish (name_decl, name_string);
965 : }
966 :
967 507140 : vtable_ptr = ti->vtable;
968 507140 : if (!vtable_ptr)
969 : {
970 49721 : int flags = push_abi_namespace ();
971 49721 : tree real_type = xref_tag (class_type, ti->name);
972 49721 : tree real_decl = TYPE_NAME (real_type);
973 49721 : DECL_SOURCE_LOCATION (real_decl) = BUILTINS_LOCATION;
974 49721 : pop_abi_namespace (flags);
975 :
976 49721 : if (!COMPLETE_TYPE_P (real_type))
977 : {
978 : /* We never saw a definition of this type, so we need to
979 : tell the compiler that this is an exported class, as
980 : indeed all of the __*_type_info classes are. */
981 48948 : SET_CLASSTYPE_INTERFACE_KNOWN (real_type);
982 48948 : CLASSTYPE_INTERFACE_ONLY (real_type) = 1;
983 : }
984 :
985 49721 : vtable_ptr = get_vtable_decl (real_type, /*complete=*/1);
986 49721 : vtable_ptr = cp_build_addr_expr (vtable_ptr, tf_warning_or_error);
987 :
988 : /* We need to point into the middle of the vtable. */
989 49721 : vtable_ptr = fold_build_pointer_plus
990 : (vtable_ptr,
991 : size_binop (MULT_EXPR,
992 : size_int (2 * TARGET_VTABLE_DATA_ENTRY_DISTANCE),
993 : TYPE_SIZE_UNIT (vtable_entry_type)));
994 :
995 49721 : ti->vtable = vtable_ptr;
996 : }
997 :
998 507140 : vec_alloc (v, 2);
999 507140 : CONSTRUCTOR_APPEND_ELT (v, NULL_TREE, vtable_ptr);
1000 507140 : CONSTRUCTOR_APPEND_ELT (v, NULL_TREE,
1001 : decay_conversion (name_decl, tf_warning_or_error));
1002 :
1003 507140 : init = build_constructor (init_list_type_node, v);
1004 507140 : TREE_CONSTANT (init) = 1;
1005 507140 : TREE_STATIC (init) = 1;
1006 :
1007 507140 : return init;
1008 : }
1009 :
1010 : /* Return the CONSTRUCTOR expr for a type_info of TYPE. TI provides the
1011 : information about the particular type_info derivation, which adds no
1012 : additional fields to the type_info base. */
1013 :
1014 : static tree
1015 330 : generic_initializer (tinfo_s *ti, tree target)
1016 : {
1017 330 : tree init = tinfo_base_init (ti, target);
1018 :
1019 330 : init = build_constructor_single (init_list_type_node, NULL_TREE, init);
1020 330 : TREE_CONSTANT (init) = 1;
1021 330 : TREE_STATIC (init) = 1;
1022 330 : return init;
1023 : }
1024 :
1025 : /* Return the CONSTRUCTOR expr for a type_info of pointer TYPE.
1026 : TI provides information about the particular type_info derivation,
1027 : which adds target type and qualifier flags members to the type_info base. */
1028 :
1029 : static tree
1030 953 : ptr_initializer (tinfo_s *ti, tree target)
1031 : {
1032 953 : tree init = tinfo_base_init (ti, target);
1033 953 : tree to = TREE_TYPE (target);
1034 953 : int flags = qualifier_flags (to);
1035 953 : bool incomplete = target_incomplete_p (to);
1036 953 : vec<constructor_elt, va_gc> *v;
1037 953 : vec_alloc (v, 3);
1038 :
1039 953 : if (incomplete)
1040 64 : flags |= 8;
1041 953 : if (tx_safe_fn_type_p (to))
1042 : {
1043 2 : flags |= 0x20;
1044 2 : to = tx_unsafe_fn_variant (to);
1045 : }
1046 953 : if (flag_noexcept_type
1047 715 : && FUNC_OR_METHOD_TYPE_P (to)
1048 1027 : && TYPE_NOTHROW_P (to))
1049 : {
1050 9 : flags |= 0x40;
1051 9 : to = build_exception_variant (to, NULL_TREE);
1052 : }
1053 953 : CONSTRUCTOR_APPEND_ELT (v, NULL_TREE, init);
1054 953 : CONSTRUCTOR_APPEND_ELT (v, NULL_TREE, build_int_cst (NULL_TREE, flags));
1055 953 : CONSTRUCTOR_APPEND_ELT (v, NULL_TREE,
1056 : get_void_tinfo_ptr (TYPE_MAIN_VARIANT (to)));
1057 :
1058 953 : init = build_constructor (init_list_type_node, v);
1059 953 : TREE_CONSTANT (init) = 1;
1060 953 : TREE_STATIC (init) = 1;
1061 953 : return init;
1062 : }
1063 :
1064 : /* Return the CONSTRUCTOR expr for a type_info of pointer to member data TYPE.
1065 : TI provides information about the particular type_info derivation,
1066 : which adds class, target type and qualifier flags members to the type_info
1067 : base. */
1068 :
1069 : static tree
1070 93 : ptm_initializer (tinfo_s *ti, tree target)
1071 : {
1072 93 : tree init = tinfo_base_init (ti, target);
1073 93 : tree to = TYPE_PTRMEM_POINTED_TO_TYPE (target);
1074 93 : tree klass = TYPE_PTRMEM_CLASS_TYPE (target);
1075 93 : int flags = qualifier_flags (to);
1076 93 : bool incomplete = target_incomplete_p (to);
1077 93 : vec<constructor_elt, va_gc> *v;
1078 93 : vec_alloc (v, 4);
1079 :
1080 93 : if (incomplete)
1081 6 : flags |= 0x8;
1082 93 : if (!COMPLETE_TYPE_P (klass))
1083 6 : flags |= 0x10;
1084 93 : CONSTRUCTOR_APPEND_ELT (v, NULL_TREE, init);
1085 93 : CONSTRUCTOR_APPEND_ELT (v, NULL_TREE, build_int_cst (NULL_TREE, flags));
1086 93 : CONSTRUCTOR_APPEND_ELT (v, NULL_TREE,
1087 : get_void_tinfo_ptr (TYPE_MAIN_VARIANT (to)));
1088 93 : CONSTRUCTOR_APPEND_ELT (v, NULL_TREE, get_void_tinfo_ptr (klass));
1089 :
1090 93 : init = build_constructor (init_list_type_node, v);
1091 93 : TREE_CONSTANT (init) = 1;
1092 93 : TREE_STATIC (init) = 1;
1093 93 : return init;
1094 : }
1095 :
1096 : /* Return the CONSTRUCTOR expr for a type_info of class TYPE.
1097 : TI provides information about the particular __class_type_info derivation,
1098 : which adds hint flags and N extra initializers to the type_info base. */
1099 :
1100 : static tree
1101 505764 : class_initializer (tinfo_s *ti, tree target, unsigned n, ...)
1102 : {
1103 505764 : tree init = tinfo_base_init (ti, target);
1104 505764 : va_list extra_inits;
1105 505764 : unsigned i;
1106 505764 : vec<constructor_elt, va_gc> *v;
1107 505764 : vec_alloc (v, n+1);
1108 :
1109 505764 : CONSTRUCTOR_APPEND_ELT (v, NULL_TREE, init);
1110 505764 : va_start (extra_inits, n);
1111 1000735 : for (i = 0; i < n; i++)
1112 494971 : CONSTRUCTOR_APPEND_ELT (v, NULL_TREE, va_arg (extra_inits, tree));
1113 505764 : va_end (extra_inits);
1114 :
1115 505764 : init = build_constructor (init_list_type_node, v);
1116 505764 : TREE_CONSTANT (init) = 1;
1117 505764 : TREE_STATIC (init) = 1;
1118 505764 : return init;
1119 : }
1120 :
1121 : /* Returns true if the typeinfo for type should be placed in
1122 : the runtime library. */
1123 :
1124 : static bool
1125 5894646 : typeinfo_in_lib_p (tree type)
1126 : {
1127 : /* The typeinfo objects for `T*' and `const T*' are in the runtime
1128 : library for simple types T. */
1129 5894646 : if (TYPE_PTR_P (type)
1130 5894646 : && (cp_type_quals (TREE_TYPE (type)) == TYPE_QUAL_CONST
1131 1115 : || cp_type_quals (TREE_TYPE (type)) == TYPE_UNQUALIFIED))
1132 1744 : type = TREE_TYPE (type);
1133 :
1134 5894646 : switch (TREE_CODE (type))
1135 : {
1136 : case INTEGER_TYPE:
1137 : case BOOLEAN_TYPE:
1138 : case REAL_TYPE:
1139 : case VOID_TYPE:
1140 : case NULLPTR_TYPE:
1141 : return true;
1142 :
1143 5853741 : case LANG_TYPE:
1144 : /* fall through. */
1145 :
1146 5853741 : default:
1147 5853741 : return false;
1148 : }
1149 : }
1150 :
1151 : /* Generate the initializer for the type info describing TYPE. TK_INDEX is
1152 : the index of the descriptor in the tinfo_desc vector. */
1153 :
1154 : static tree
1155 507140 : get_pseudo_ti_init (tree type, unsigned tk_index)
1156 : {
1157 507140 : tinfo_s *ti = get_tinfo_desc (tk_index);
1158 :
1159 507140 : gcc_assert (at_eof);
1160 507140 : switch (tk_index)
1161 : {
1162 93 : case TK_POINTER_MEMBER_TYPE:
1163 93 : return ptm_initializer (ti, type);
1164 :
1165 953 : case TK_POINTER_TYPE:
1166 953 : return ptr_initializer (ti, type);
1167 :
1168 330 : case TK_BUILTIN_TYPE:
1169 330 : case TK_ENUMERAL_TYPE:
1170 330 : case TK_FUNCTION_TYPE:
1171 330 : case TK_ARRAY_TYPE:
1172 330 : return generic_initializer (ti, type);
1173 :
1174 122445 : case TK_CLASS_TYPE:
1175 122445 : return class_initializer (ti, type, 0);
1176 :
1177 327493 : case TK_SI_CLASS_TYPE:
1178 327493 : {
1179 327493 : tree base_binfo = BINFO_BASE_BINFO (TYPE_BINFO (type), 0);
1180 327493 : tree tinfo = get_void_tinfo_ptr (BINFO_TYPE (base_binfo));
1181 :
1182 : /* get_tinfo_ptr might have reallocated the tinfo_descs vector. */
1183 327493 : ti = &(*tinfo_descs)[tk_index];
1184 327493 : return class_initializer (ti, type, 1, tinfo);
1185 : }
1186 :
1187 55826 : default:
1188 55826 : {
1189 55826 : int hint = ((CLASSTYPE_REPEATED_BASE_P (type) << 0)
1190 55826 : | (CLASSTYPE_DIAMOND_SHAPED_P (type) << 1));
1191 55826 : tree binfo = TYPE_BINFO (type);
1192 55826 : unsigned nbases = BINFO_N_BASE_BINFOS (binfo);
1193 55826 : vec<tree, va_gc> *base_accesses = BINFO_BASE_ACCESSES (binfo);
1194 55961 : tree offset_type = LONGPTR_T;
1195 55826 : vec<constructor_elt, va_gc> *init_vec = NULL;
1196 :
1197 55826 : gcc_assert (tk_index - TK_VMI_CLASS_TYPES + 1 == nbases);
1198 :
1199 55826 : vec_safe_grow (init_vec, nbases, true);
1200 : /* Generate the base information initializer. */
1201 155831 : for (unsigned ix = nbases; ix--;)
1202 : {
1203 100005 : tree base_binfo = BINFO_BASE_BINFO (binfo, ix);
1204 100005 : int flags = 0;
1205 100005 : tree tinfo;
1206 100005 : tree offset;
1207 100005 : vec<constructor_elt, va_gc> *v;
1208 :
1209 100005 : if ((*base_accesses)[ix] == access_public_node)
1210 98288 : flags |= 2;
1211 100005 : tinfo = get_void_tinfo_ptr (BINFO_TYPE (base_binfo));
1212 100005 : if (BINFO_VIRTUAL_P (base_binfo))
1213 : {
1214 : /* We store the vtable offset at which the virtual
1215 : base offset can be found. */
1216 4206 : offset = BINFO_VPTR_FIELD (base_binfo);
1217 4206 : flags |= 1;
1218 : }
1219 : else
1220 95799 : offset = BINFO_OFFSET (base_binfo);
1221 :
1222 : /* Combine offset and flags into one field. */
1223 100005 : offset = fold_convert (offset_type, offset);
1224 100005 : offset = fold_build2_loc (input_location,
1225 : LSHIFT_EXPR, offset_type, offset,
1226 : build_int_cst (offset_type, 8));
1227 100005 : offset = fold_build2_loc (input_location,
1228 : BIT_IOR_EXPR, offset_type, offset,
1229 100005 : build_int_cst (offset_type, flags));
1230 100005 : vec_alloc (v, 2);
1231 100005 : CONSTRUCTOR_APPEND_ELT (v, NULL_TREE, tinfo);
1232 100005 : CONSTRUCTOR_APPEND_ELT (v, NULL_TREE, offset);
1233 100005 : tree base_init = build_constructor (init_list_type_node, v);
1234 100005 : constructor_elt *e = &(*init_vec)[ix];
1235 100005 : e->index = NULL_TREE;
1236 100005 : e->value = base_init;
1237 : }
1238 55826 : tree base_inits = build_constructor (init_list_type_node, init_vec);
1239 :
1240 : /* get_tinfo_ptr might have reallocated the tinfo_descs vector. */
1241 55826 : ti = &(*tinfo_descs)[tk_index];
1242 55826 : return class_initializer (ti, type, 3,
1243 55826 : build_int_cst (NULL_TREE, hint),
1244 55826 : build_int_cst (NULL_TREE, nbases),
1245 : base_inits);
1246 : }
1247 : }
1248 : }
1249 :
1250 : /* Return the index of a pseudo type info type node used to describe
1251 : TYPE. TYPE must be a complete type (or cv void), except at the end
1252 : of the translation unit. */
1253 :
1254 : static unsigned
1255 2419166 : get_pseudo_ti_index (tree type)
1256 : {
1257 2419166 : unsigned ix;
1258 :
1259 2419166 : switch (TREE_CODE (type))
1260 : {
1261 : case OFFSET_TYPE:
1262 : ix = TK_POINTER_MEMBER_TYPE;
1263 : break;
1264 :
1265 : case POINTER_TYPE:
1266 2419166 : ix = TK_POINTER_TYPE;
1267 : break;
1268 :
1269 24 : case ENUMERAL_TYPE:
1270 24 : ix = TK_ENUMERAL_TYPE;
1271 24 : break;
1272 :
1273 230 : case FUNCTION_TYPE:
1274 230 : ix = TK_FUNCTION_TYPE;
1275 230 : break;
1276 :
1277 56 : case ARRAY_TYPE:
1278 56 : ix = TK_ARRAY_TYPE;
1279 56 : break;
1280 :
1281 2404965 : case UNION_TYPE:
1282 2404965 : case RECORD_TYPE:
1283 2404965 : if (TYPE_PTRMEMFUNC_P (type))
1284 : ix = TK_POINTER_MEMBER_TYPE;
1285 2404871 : else if (!COMPLETE_TYPE_P (type))
1286 : {
1287 55 : if (!at_eof)
1288 1 : cxx_incomplete_type_error (NULL_TREE, type);
1289 : ix = TK_CLASS_TYPE;
1290 : }
1291 2404816 : else if (!TYPE_BINFO (type)
1292 2404816 : || !BINFO_N_BASE_BINFOS (TYPE_BINFO (type)))
1293 : ix = TK_CLASS_TYPE;
1294 : else
1295 : {
1296 2019810 : tree binfo = TYPE_BINFO (type);
1297 2019810 : vec<tree, va_gc> *base_accesses = BINFO_BASE_ACCESSES (binfo);
1298 2019810 : tree base_binfo = BINFO_BASE_BINFO (binfo, 0);
1299 2019810 : int num_bases = BINFO_N_BASE_BINFOS (binfo);
1300 :
1301 2019810 : if (num_bases == 1
1302 1790939 : && (*base_accesses)[0] == access_public_node
1303 1788138 : && !BINFO_VIRTUAL_P (base_binfo)
1304 3762629 : && integer_zerop (BINFO_OFFSET (base_binfo)))
1305 : /* single non-virtual public. */
1306 : ix = TK_SI_CLASS_TYPE;
1307 : else
1308 295728 : ix = TK_VMI_CLASS_TYPES + num_bases - 1;
1309 : }
1310 : break;
1311 :
1312 11586 : default:
1313 11586 : ix = TK_BUILTIN_TYPE;
1314 11586 : break;
1315 : }
1316 2419166 : return ix;
1317 : }
1318 :
1319 : /* Return pointer to tinfo descriptor. Possibly creating the tinfo
1320 : descriptor in the first place. */
1321 :
1322 : static tinfo_s *
1323 3246231 : get_tinfo_desc (unsigned ix)
1324 : {
1325 3246231 : if (tinfo_descs->length () <= ix)
1326 : /* too short, extend. */
1327 50874 : vec_safe_grow_cleared (tinfo_descs, ix + 1);
1328 :
1329 3246231 : tinfo_s *res = &(*tinfo_descs)[ix];
1330 :
1331 3246231 : if (res->type)
1332 : return res;
1333 :
1334 : /* Ok, we have to create it. This layout must be consistent with
1335 : that defined in the runtime support. We explicitly manage the
1336 : vtable member, and name it for real type as used in the runtime.
1337 : The RECORD type has a different name, to avoid collisions. We
1338 : have to delay generating the VAR_DECL of the vtable until the end
1339 : of the translation, when we'll have seen the library definition,
1340 : if there was one. */
1341 :
1342 : /* Fields to add, chained in reverse order. */
1343 107635 : tree fields = NULL_TREE;
1344 :
1345 107635 : if (ix >= TK_DERIVED_TYPES)
1346 : {
1347 : /* First field is the pseudo type_info base class. */
1348 72479 : tree fld_base = build_decl (BUILTINS_LOCATION, FIELD_DECL, NULL_TREE,
1349 72479 : get_tinfo_desc (TK_TYPE_INFO_TYPE)->type);
1350 :
1351 72479 : DECL_CHAIN (fld_base) = fields;
1352 72479 : fields = fld_base;
1353 : }
1354 :
1355 107635 : switch (ix)
1356 : {
1357 21478 : case TK_TYPE_INFO_TYPE:
1358 21478 : {
1359 21478 : tree fld_ptr = build_decl (BUILTINS_LOCATION, FIELD_DECL,
1360 : NULL_TREE, const_ptr_type_node);
1361 21478 : fields = fld_ptr;
1362 :
1363 21478 : tree fld_str = build_decl (BUILTINS_LOCATION, FIELD_DECL,
1364 : NULL_TREE, const_string_type_node);
1365 21478 : DECL_CHAIN (fld_str) = fields;
1366 21478 : fields = fld_str;
1367 21478 : break;
1368 : }
1369 :
1370 13678 : case TK_BASE_TYPE:
1371 13678 : {
1372 : /* Base class internal helper. Pointer to base type, offset to
1373 : base, flags. */
1374 13678 : tree fld_ptr = build_decl (BUILTINS_LOCATION, FIELD_DECL,
1375 : NULL_TREE, const_ptr_type_node);
1376 13678 : DECL_CHAIN (fld_ptr) = fields;
1377 13678 : fields = fld_ptr;
1378 :
1379 13678 : tree fld_flag = build_decl (BUILTINS_LOCATION, FIELD_DECL,
1380 13772 : NULL_TREE, LONGPTR_T);
1381 13678 : DECL_CHAIN (fld_flag) = fields;
1382 13678 : fields = fld_flag;
1383 13678 : break;
1384 : }
1385 :
1386 : case TK_BUILTIN_TYPE:
1387 : /* Fundamental type_info */
1388 : break;
1389 :
1390 : case TK_ARRAY_TYPE:
1391 : break;
1392 :
1393 : case TK_FUNCTION_TYPE:
1394 : break;
1395 :
1396 : case TK_ENUMERAL_TYPE:
1397 : break;
1398 :
1399 460 : case TK_POINTER_TYPE:
1400 460 : case TK_POINTER_MEMBER_TYPE:
1401 460 : {
1402 : /* Pointer type_info. Adds two fields, qualification mask and
1403 : pointer to the pointed to type. This is really a
1404 : descendant of __pbase_type_info. */
1405 460 : tree fld_mask = build_decl (BUILTINS_LOCATION, FIELD_DECL,
1406 : NULL_TREE, integer_type_node);
1407 460 : DECL_CHAIN (fld_mask) = fields;
1408 460 : fields = fld_mask;
1409 :
1410 460 : tree fld_ptr = build_decl (BUILTINS_LOCATION, FIELD_DECL,
1411 : NULL_TREE, const_ptr_type_node);
1412 460 : DECL_CHAIN (fld_ptr) = fields;
1413 460 : fields = fld_ptr;
1414 :
1415 460 : if (ix == TK_POINTER_MEMBER_TYPE)
1416 : {
1417 : /* Add a pointer to the class too. */
1418 43 : tree fld_cls = build_decl (BUILTINS_LOCATION, FIELD_DECL,
1419 : NULL_TREE, const_ptr_type_node);
1420 43 : DECL_CHAIN (fld_cls) = fields;
1421 43 : fields = fld_cls;
1422 : }
1423 : break;
1424 : }
1425 :
1426 : case TK_CLASS_TYPE:
1427 : /* Class type_info. No additional fields. */
1428 : break;
1429 :
1430 16541 : case TK_SI_CLASS_TYPE:
1431 16541 : {
1432 : /* Single public non-virtual base class. Add pointer to base
1433 : class. This is really a descendant of
1434 : __class_type_info. */
1435 16541 : tree fld_ptr = build_decl (BUILTINS_LOCATION, FIELD_DECL,
1436 : NULL_TREE, const_ptr_type_node);
1437 16541 : DECL_CHAIN (fld_ptr) = fields;
1438 16541 : fields = fld_ptr;
1439 16541 : break;
1440 : }
1441 :
1442 24922 : default: /* Multiple inheritance. */
1443 24922 : {
1444 24922 : unsigned num_bases = ix - TK_VMI_CLASS_TYPES + 1;
1445 :
1446 24922 : tree fld_flg = build_decl (BUILTINS_LOCATION, FIELD_DECL,
1447 : NULL_TREE, integer_type_node);
1448 24922 : DECL_CHAIN (fld_flg) = fields;
1449 24922 : fields = fld_flg;
1450 :
1451 24922 : tree fld_cnt = build_decl (BUILTINS_LOCATION, FIELD_DECL,
1452 : NULL_TREE, integer_type_node);
1453 24922 : DECL_CHAIN (fld_cnt) = fields;
1454 24922 : fields = fld_cnt;
1455 :
1456 : /* Create the array of __base_class_type_info entries. */
1457 24922 : tree domain = build_index_type (size_int (num_bases - 1));
1458 24922 : tree array = build_array_type (get_tinfo_desc (TK_BASE_TYPE)->type,
1459 : domain);
1460 24922 : tree fld_ary = build_decl (BUILTINS_LOCATION, FIELD_DECL,
1461 : NULL_TREE, array);
1462 24922 : DECL_CHAIN (fld_ary) = fields;
1463 24922 : fields = fld_ary;
1464 24922 : break;
1465 : }
1466 : }
1467 :
1468 : /* Generate the pseudo type name. */
1469 107635 : const char *real_name = tinfo_names[ix < TK_VMI_CLASS_TYPES
1470 107635 : ? ix : unsigned (TK_VMI_CLASS_TYPES)];
1471 107635 : size_t name_len = strlen (real_name);
1472 107635 : char *pseudo_name = (char *) alloca (name_len + 30);
1473 107635 : memcpy (pseudo_name, real_name, name_len);
1474 : /* Those >= TK_VMI_CLASS_TYPES need a discriminator, may as well
1475 : apply it to all. See get_peudo_tinfo_index where we make use of
1476 : this. */
1477 107635 : sprintf (pseudo_name + name_len, "_pseudo_%d", ix);
1478 :
1479 : /* Create the pseudo type. */
1480 107635 : tree pseudo_type = make_class_type (RECORD_TYPE);
1481 : /* Pass the fields chained in reverse. */
1482 107635 : finish_builtin_struct (pseudo_type, pseudo_name, fields, NULL_TREE);
1483 107635 : CLASSTYPE_AS_BASE (pseudo_type) = pseudo_type;
1484 107635 : DECL_CONTEXT (TYPE_NAME (pseudo_type)) = FROB_CONTEXT (global_namespace);
1485 107635 : DECL_TINFO_P (TYPE_NAME (pseudo_type)) = true;
1486 107635 : xref_basetypes (pseudo_type, /*bases=*/NULL_TREE);
1487 :
1488 107635 : res->type = cp_build_qualified_type (pseudo_type, TYPE_QUAL_CONST);
1489 107635 : res->name = get_identifier (real_name);
1490 :
1491 : /* Pretend this is public so determine_visibility doesn't give vtables
1492 : internal linkage. */
1493 107635 : TREE_PUBLIC (TYPE_MAIN_DECL (res->type)) = 1;
1494 :
1495 107635 : return res;
1496 : }
1497 :
1498 : /* Return an identifying index for the pseudo type_info TYPE.
1499 : We wrote the index at the end of the name, so just scan it from
1500 : there. This isn't critical, as it's only on the first use of this
1501 : type during module stream out. */
1502 :
1503 : unsigned
1504 11183 : get_pseudo_tinfo_index (tree type)
1505 : {
1506 11183 : tree name = DECL_NAME (TYPE_NAME (type));
1507 11183 : unsigned ix = 0, scale = 1;
1508 11183 : size_t len = IDENTIFIER_LENGTH (name);
1509 11183 : const char *ptr = IDENTIFIER_POINTER (name) + len;
1510 :
1511 24325 : for (; *--ptr != '_'; scale *= 10)
1512 : {
1513 13142 : len--;
1514 13142 : gcc_checking_assert (len && ISDIGIT (*ptr));
1515 13142 : ix += (*ptr - '0') * scale;
1516 : }
1517 :
1518 11183 : gcc_assert (len != IDENTIFIER_LENGTH (name));
1519 11183 : return ix;
1520 : }
1521 :
1522 : tree
1523 1783 : get_pseudo_tinfo_type (unsigned ix)
1524 : {
1525 1783 : return get_tinfo_desc (ix)->type;
1526 : }
1527 :
1528 : /* We lazily create the type info types. */
1529 :
1530 : static void
1531 97402 : create_tinfo_types (void)
1532 : {
1533 97402 : gcc_assert (!tinfo_descs);
1534 :
1535 97402 : vec_alloc (tinfo_descs, TK_MAX + 20);
1536 97402 : }
1537 :
1538 : /* Helper for emit_support_tinfos. Emits the type_info descriptor of
1539 : a single type. */
1540 :
1541 : void
1542 183 : emit_support_tinfo_1 (tree bltn)
1543 : {
1544 183 : tree types[3];
1545 :
1546 183 : if (bltn == NULL_TREE)
1547 5 : return;
1548 178 : types[0] = bltn;
1549 178 : types[1] = build_pointer_type (bltn);
1550 178 : types[2] = build_pointer_type (cp_build_qualified_type (bltn,
1551 : TYPE_QUAL_CONST));
1552 :
1553 712 : for (int i = 0; i < 3; ++i)
1554 : {
1555 534 : tree tinfo = get_tinfo_decl (types[i]);
1556 534 : TREE_USED (tinfo) = 1;
1557 534 : mark_needed (tinfo);
1558 : /* The C++ ABI requires that these objects be COMDAT. But,
1559 : On systems without weak symbols, initialized COMDAT
1560 : objects are emitted with internal linkage. (See
1561 : comdat_linkage for details.) Since we want these objects
1562 : to have external linkage so that copies do not have to be
1563 : emitted in code outside the runtime library, we make them
1564 : non-COMDAT here.
1565 :
1566 : It might also not be necessary to follow this detail of the
1567 : ABI. */
1568 534 : if (!flag_weak || ! targetm.cxx.library_rtti_comdat ())
1569 : {
1570 0 : gcc_assert (TREE_PUBLIC (tinfo) && !DECL_COMDAT (tinfo));
1571 0 : DECL_INTERFACE_KNOWN (tinfo) = 1;
1572 : }
1573 :
1574 : /* Emit it right away if not emitted already. */
1575 534 : if (DECL_INITIAL (tinfo) == NULL_TREE)
1576 : {
1577 504 : bool ok = emit_tinfo_decl (tinfo);
1578 504 : gcc_assert (ok);
1579 : /* When compiling libsupc++.a (fundamental_type_info.o),
1580 : unemitted_tinfo_decls->last () will be tinfo, so pop it
1581 : from the vector as it is emitted now. If one uses typeid
1582 : etc. in the same TU as the definition of
1583 : ~fundamental_type_info (), the tinfo might be emitted
1584 : already earlier, in such case keep it in the vector
1585 : (as otherwise we'd need to walk the whole vector) and
1586 : let c_parse_final_cleanups ignore it when it will have
1587 : non-NULL DECL_INITIAL. */
1588 504 : if (unemitted_tinfo_decls->last () == tinfo)
1589 501 : unemitted_tinfo_decls->pop ();
1590 : }
1591 : }
1592 : }
1593 :
1594 : /* Emit the type_info descriptors which are guaranteed to be in the runtime
1595 : support. Generating them here guarantees consistency with the other
1596 : structures. We use the following heuristic to determine when the runtime
1597 : is being generated. If std::__fundamental_type_info is defined, and its
1598 : destructor is defined, then the runtime is being built. */
1599 :
1600 : void
1601 95797 : emit_support_tinfos (void)
1602 : {
1603 : /* Dummy static variable so we can put nullptr in the array; it will be
1604 : set before we actually start to walk the array. */
1605 95797 : static tree *const fundamentals[] =
1606 : {
1607 : &void_type_node,
1608 : &boolean_type_node,
1609 : &wchar_type_node, &char8_type_node, &char16_type_node, &char32_type_node,
1610 : &char_type_node, &signed_char_type_node, &unsigned_char_type_node,
1611 : &short_integer_type_node, &short_unsigned_type_node,
1612 : &integer_type_node, &unsigned_type_node,
1613 : &long_integer_type_node, &long_unsigned_type_node,
1614 : &long_long_integer_type_node, &long_long_unsigned_type_node,
1615 : &float_type_node, &double_type_node, &long_double_type_node,
1616 : &bfloat16_type_node, &float16_type_node, &float32_type_node,
1617 : &float64_type_node, &float128_type_node, &float32x_type_node,
1618 : &float64x_type_node, &float128x_type_node, &nullptr_type_node,
1619 : 0
1620 : };
1621 : /* Similar, but for floating point types only which should get type info
1622 : regardless whether they are non-NULL or NULL. */
1623 95797 : static tree *const fundamentals_with_fallback[] =
1624 : {
1625 : &dfloat32_type_node, &dfloat64_type_node, &dfloat128_type_node,
1626 : 0
1627 : };
1628 95797 : int ix;
1629 :
1630 : /* Look for a defined class. */
1631 95797 : tree bltn_type = lookup_qualified_name
1632 95797 : (abi_node, "__fundamental_type_info", LOOK_want::TYPE, false);
1633 95797 : if (TREE_CODE (bltn_type) != TYPE_DECL)
1634 : return;
1635 :
1636 337 : bltn_type = TREE_TYPE (bltn_type);
1637 337 : if (!COMPLETE_TYPE_P (bltn_type))
1638 : return;
1639 337 : tree dtor = CLASSTYPE_DESTRUCTOR (bltn_type);
1640 337 : if (!dtor || DECL_EXTERNAL (dtor))
1641 : return;
1642 :
1643 : /* All these are really builtins. So set the location. */
1644 5 : location_t saved_loc = input_location;
1645 5 : input_location = BUILTINS_LOCATION;
1646 5 : doing_runtime = 1;
1647 5 : tree fallback = NULL_TREE;
1648 150 : for (ix = 0; fundamentals[ix]; ix++)
1649 145 : emit_support_tinfo_1 (*fundamentals[ix]);
1650 20 : for (ix = 0; fundamentals_with_fallback[ix]; ix++)
1651 15 : if (*fundamentals_with_fallback[ix])
1652 15 : emit_support_tinfo_1 (*fundamentals_with_fallback[ix]);
1653 : else
1654 : {
1655 0 : if (fallback == NULL_TREE)
1656 0 : fallback = make_node (REAL_TYPE);
1657 0 : *fundamentals_with_fallback[ix] = fallback;
1658 0 : emit_support_tinfo_1 (fallback);
1659 0 : *fundamentals_with_fallback[ix] = NULL_TREE;
1660 : }
1661 10 : for (ix = 0; ix < NUM_INT_N_ENTS; ix ++)
1662 5 : if (int_n_enabled_p[ix])
1663 : {
1664 4 : emit_support_tinfo_1 (int_n_trees[ix].signed_type);
1665 4 : emit_support_tinfo_1 (int_n_trees[ix].unsigned_type);
1666 : }
1667 20 : for (tree t = registered_builtin_types; t; t = TREE_CHAIN (t))
1668 15 : emit_support_tinfo_1 (TREE_VALUE (t));
1669 :
1670 : /* Emit additional typeinfos as requested by target. */
1671 5 : targetm.emit_support_tinfos (emit_support_tinfo_1);
1672 :
1673 5 : input_location = saved_loc;
1674 : }
1675 :
1676 : /* Finish a type info decl. DECL_PTR is a pointer to an unemitted
1677 : tinfo decl. Determine whether it needs emitting, and if so
1678 : generate the initializer. */
1679 :
1680 : bool
1681 5894646 : emit_tinfo_decl (tree decl)
1682 : {
1683 5894646 : gcc_assert (DECL_TINFO_P (decl));
1684 :
1685 5894646 : tree type = TREE_TYPE (DECL_NAME (decl));
1686 5894646 : if (typeinfo_in_lib_p (type))
1687 : {
1688 40905 : if (doing_runtime)
1689 504 : DECL_EXTERNAL (decl) = 0;
1690 : else
1691 : {
1692 : /* If we're not in the runtime, then DECL (which is already
1693 : DECL_EXTERNAL) will not be defined here. */
1694 40401 : DECL_INTERFACE_KNOWN (decl) = 1;
1695 40401 : return false;
1696 : }
1697 : }
1698 5853741 : else if (involves_incomplete_p (type))
1699 : {
1700 99 : if (!decl_needed_p (decl))
1701 : return false;
1702 : /* If TYPE involves an incomplete class type, then the typeinfo
1703 : object will be emitted with internal linkage. There is no
1704 : way to know whether or not types are incomplete until the end
1705 : of the compilation, so this determination must be deferred
1706 : until this point. */
1707 99 : TREE_PUBLIC (decl) = 0;
1708 99 : DECL_EXTERNAL (decl) = 0;
1709 99 : DECL_INTERFACE_KNOWN (decl) = 1;
1710 : }
1711 :
1712 5854245 : import_export_decl (decl);
1713 5854245 : if (DECL_NOT_REALLY_EXTERN (decl) && decl_needed_p (decl))
1714 : {
1715 507140 : tree init;
1716 :
1717 507140 : DECL_EXTERNAL (decl) = 0;
1718 507140 : int pseudo_ix = get_pseudo_ti_index (type);
1719 507140 : const tinfo_s *ti = get_tinfo_desc (pseudo_ix);
1720 507140 : if (TREE_TYPE (decl) != ti->type)
1721 : {
1722 : /* If the class became complete since we first called get_tinfo_decl,
1723 : its type_info descriptor may have switched from __class_type_info
1724 : to e.g. __si_class_type_info. */
1725 3 : TREE_TYPE (decl) = ti->type;
1726 3 : relayout_decl (decl);
1727 : }
1728 507140 : init = get_pseudo_ti_init (type, pseudo_ix);
1729 507140 : DECL_INITIAL (decl) = init;
1730 507140 : mark_used (decl);
1731 507140 : cp_finish_decl (decl, init, false, NULL_TREE, 0);
1732 : /* Avoid targets optionally bumping up the alignment to improve
1733 : vector instruction accesses, tinfo are never accessed this way. */
1734 : #ifdef DATA_ABI_ALIGNMENT
1735 507140 : SET_DECL_ALIGN (decl, DATA_ABI_ALIGNMENT (TREE_TYPE (decl),
1736 : TYPE_ALIGN (TREE_TYPE (decl))));
1737 507140 : DECL_USER_ALIGN (decl) = true;
1738 : #endif
1739 507140 : return true;
1740 : }
1741 : else
1742 5347105 : return false;
1743 : }
1744 :
1745 : #include "gt-cp-rtti.h"
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