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84a43794 | 1 | /* RunTime Type Identification |
5624e564 | 2 | Copyright (C) 1995-2015 Free Software Foundation, Inc. |
6b5fbb55 | 3 | Mostly written by Jason Merrill (jason@cygnus.com). |
84a43794 | 4 | |
f5adbb8d | 5 | This file is part of GCC. |
84a43794 | 6 | |
f5adbb8d | 7 | GCC is free software; you can redistribute it and/or modify |
84a43794 | 8 | it under the terms of the GNU General Public License as published by |
e77f031d | 9 | the Free Software Foundation; either version 3, or (at your option) |
84a43794 MS |
10 | any later version. |
11 | ||
f5adbb8d | 12 | GCC is distributed in the hope that it will be useful, |
84a43794 MS |
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 | |
e77f031d NC |
18 | along with GCC; see the file COPYING3. If not see |
19 | <http://www.gnu.org/licenses/>. */ | |
84a43794 | 20 | |
84a43794 | 21 | #include "config.h" |
8d052bc7 | 22 | #include "system.h" |
4cd5a50a | 23 | #include "intl.h" |
4977bab6 ZW |
24 | #include "coretypes.h" |
25 | #include "tm.h" | |
40e23961 MC |
26 | #include "hash-set.h" |
27 | #include "machmode.h" | |
28 | #include "vec.h" | |
29 | #include "double-int.h" | |
30 | #include "input.h" | |
31 | #include "alias.h" | |
32 | #include "symtab.h" | |
33 | #include "wide-int.h" | |
34 | #include "inchash.h" | |
84a43794 | 35 | #include "tree.h" |
c517fc92 | 36 | #include "tm_p.h" |
d8a2d370 DN |
37 | #include "stringpool.h" |
38 | #include "stor-layout.h" | |
84a43794 MS |
39 | #include "cp-tree.h" |
40 | #include "flags.h" | |
7b6d72fc | 41 | #include "convert.h" |
157600d0 | 42 | #include "target.h" |
39dabefd | 43 | #include "c-family/c-pragma.h" |
5156628f | 44 | |
d689a8f1 NS |
45 | /* C++ returns type information to the user in struct type_info |
46 | objects. We also use type information to implement dynamic_cast and | |
47 | exception handlers. Type information for a particular type is | |
48 | indicated with an ABI defined structure derived from type_info. | |
49 | This would all be very straight forward, but for the fact that the | |
50 | runtime library provides the definitions of the type_info structure | |
51 | and the ABI defined derived classes. We cannot build declarations | |
52 | of them directly in the compiler, but we need to layout objects of | |
53 | their type. Somewhere we have to lie. | |
54 | ||
55 | We define layout compatible POD-structs with compiler-defined names | |
56 | and generate the appropriate initializations for them (complete | |
57 | with explicit mention of their vtable). When we have to provide a | |
58 | type_info to the user we reinterpret_cast the internal compiler | |
59 | type to type_info. A well formed program can only explicitly refer | |
60 | to the type_infos of complete types (& cv void). However, we chain | |
61 | pointer type_infos to the pointed-to-type, and that can be | |
62 | incomplete. We only need the addresses of such incomplete | |
63 | type_info objects for static initialization. | |
64 | ||
65 | The type information VAR_DECL of a type is held on the | |
66 | IDENTIFIER_GLOBAL_VALUE of the type's mangled name. That VAR_DECL | |
67 | will be the internal type. It will usually have the correct | |
68 | internal type reflecting the kind of type it represents (pointer, | |
69 | array, function, class, inherited class, etc). When the type it | |
70 | represents is incomplete, it will have the internal type | |
71 | corresponding to type_info. That will only happen at the end of | |
72 | translation, when we are emitting the type info objects. */ | |
73 | ||
1bf5fc34 | 74 | /* Auxiliary data we hold for each type_info derived object we need. */ |
d1b38208 | 75 | typedef struct GTY (()) tinfo_s { |
1bf5fc34 NS |
76 | tree type; /* The RECORD_TYPE for this type_info object */ |
77 | ||
78 | tree vtable; /* The VAR_DECL of the vtable. Only filled at end of | |
79 | translation. */ | |
80 | ||
81 | tree name; /* IDENTIFIER_NODE for the ABI specified name of | |
82 | the type_info derived type. */ | |
83 | } tinfo_s; | |
84 | ||
1bf5fc34 NS |
85 | |
86 | typedef enum tinfo_kind | |
87 | { | |
3a44f395 | 88 | TK_TYPE_INFO_TYPE, /* abi::__type_info_pseudo */ |
1bf5fc34 NS |
89 | TK_BASE_TYPE, /* abi::__base_class_type_info */ |
90 | TK_BUILTIN_TYPE, /* abi::__fundamental_type_info */ | |
91 | TK_ARRAY_TYPE, /* abi::__array_type_info */ | |
92 | TK_FUNCTION_TYPE, /* abi::__function_type_info */ | |
93 | TK_ENUMERAL_TYPE, /* abi::__enum_type_info */ | |
94 | TK_POINTER_TYPE, /* abi::__pointer_type_info */ | |
95 | TK_POINTER_MEMBER_TYPE, /* abi::__pointer_to_member_type_info */ | |
96 | TK_CLASS_TYPE, /* abi::__class_type_info */ | |
97 | TK_SI_CLASS_TYPE, /* abi::__si_class_type_info */ | |
3db45ab5 MS |
98 | TK_FIXED /* end of fixed descriptors. */ |
99 | /* ... abi::__vmi_type_info<I> */ | |
1bf5fc34 | 100 | } tinfo_kind; |
84a43794 | 101 | |
1c773c7a KT |
102 | /* Helper macro to get maximum scalar-width of pointer or of the 'long'-type. |
103 | This of interest for llp64 targets. */ | |
104 | #define LONGPTR_T \ | |
105 | integer_types[(POINTER_SIZE <= TYPE_PRECISION (integer_types[itk_long]) \ | |
106 | ? itk_long : itk_long_long)] | |
107 | ||
94214953 | 108 | /* A vector of all tinfo decls that haven't yet been emitted. */ |
9771b263 | 109 | vec<tree, va_gc> *unemitted_tinfo_decls; |
a260bce6 | 110 | |
1bf5fc34 NS |
111 | /* A vector of all type_info derived types we need. The first few are |
112 | fixed and created early. The remainder are for multiple inheritance | |
113 | and are generated as needed. */ | |
9771b263 | 114 | static GTY (()) vec<tinfo_s, va_gc> *tinfo_descs; |
1bf5fc34 | 115 | |
4b978f96 | 116 | static tree ifnonnull (tree, tree, tsubst_flags_t); |
52669d59 | 117 | static tree tinfo_name (tree, bool); |
5ade1ed2 | 118 | static tree build_dynamic_cast_1 (tree, tree, tsubst_flags_t); |
cec57f72 NN |
119 | static tree throw_bad_cast (void); |
120 | static tree throw_bad_typeid (void); | |
cec57f72 NN |
121 | static tree get_tinfo_ptr (tree); |
122 | static bool typeid_ok_p (void); | |
123 | static int qualifier_flags (tree); | |
848eed92 | 124 | static bool target_incomplete_p (tree); |
1bf5fc34 NS |
125 | static tree tinfo_base_init (tinfo_s *, tree); |
126 | static tree generic_initializer (tinfo_s *, tree); | |
127 | static tree ptr_initializer (tinfo_s *, tree); | |
128 | static tree ptm_initializer (tinfo_s *, tree); | |
e20463aa | 129 | static tree class_initializer (tinfo_s *, tree, unsigned, ...); |
fe93f42f | 130 | static void create_pseudo_type_info (int, const char *, ...); |
1bf5fc34 NS |
131 | static tree get_pseudo_ti_init (tree, unsigned); |
132 | static unsigned get_pseudo_ti_index (tree); | |
cec57f72 | 133 | static void create_tinfo_types (void); |
848eed92 | 134 | static bool typeinfo_in_lib_p (tree); |
7267d692 NS |
135 | |
136 | static int doing_runtime = 0; | |
84a43794 | 137 | \f |
a15f0fd0 JJ |
138 | static void |
139 | push_abi_namespace (void) | |
140 | { | |
141 | push_nested_namespace (abi_node); | |
9789ba46 | 142 | push_visibility ("default", 2); |
a15f0fd0 JJ |
143 | } |
144 | ||
145 | static void | |
146 | pop_abi_namespace (void) | |
147 | { | |
9789ba46 | 148 | pop_visibility (2); |
a15f0fd0 JJ |
149 | pop_nested_namespace (abi_node); |
150 | } | |
d689a8f1 NS |
151 | |
152 | /* Declare language defined type_info type and a pointer to const | |
153 | type_info. This is incomplete here, and will be completed when | |
154 | the user #includes <typeinfo>. There are language defined | |
155 | restrictions on what can be done until that is included. Create | |
156 | the internal versions of the ABI types. */ | |
157 | ||
6b5fbb55 | 158 | void |
848eed92 | 159 | init_rtti_processing (void) |
6b5fbb55 | 160 | { |
db24eb1f | 161 | tree type_info_type; |
c8094d83 | 162 | |
1dbb6023 | 163 | push_namespace (std_identifier); |
db24eb1f | 164 | type_info_type = xref_tag (class_type, get_identifier ("type_info"), |
bd3d082e | 165 | /*tag_scope=*/ts_current, false); |
1dbb6023 | 166 | pop_namespace (); |
db24eb1f | 167 | const_type_info_type_node |
a3360e77 | 168 | = cp_build_qualified_type (type_info_type, TYPE_QUAL_CONST); |
db24eb1f | 169 | type_info_ptr_type = build_pointer_type (const_type_info_type_node); |
d689a8f1 | 170 | |
9771b263 | 171 | vec_alloc (unemitted_tinfo_decls, 124); |
c8094d83 | 172 | |
d689a8f1 | 173 | create_tinfo_types (); |
6b5fbb55 MS |
174 | } |
175 | ||
6b5fbb55 MS |
176 | /* Given the expression EXP of type `class *', return the head of the |
177 | object pointed to by EXP with type cv void*, if the class has any | |
4c6b7393 | 178 | virtual functions (TYPE_POLYMORPHIC_P), else just return the |
6b5fbb55 | 179 | expression. */ |
e92cc029 | 180 | |
6f06d231 | 181 | tree |
848eed92 | 182 | build_headof (tree exp) |
84a43794 MS |
183 | { |
184 | tree type = TREE_TYPE (exp); | |
de22184b | 185 | tree offset; |
da3d4dfa | 186 | tree index; |
84a43794 | 187 | |
50e10fa8 | 188 | gcc_assert (TYPE_PTR_P (type)); |
84a43794 MS |
189 | type = TREE_TYPE (type); |
190 | ||
4c6b7393 | 191 | if (!TYPE_POLYMORPHIC_P (type)) |
84a43794 MS |
192 | return exp; |
193 | ||
6b5fbb55 MS |
194 | /* We use this a couple of times below, protect it. */ |
195 | exp = save_expr (exp); | |
196 | ||
3461fba7 | 197 | /* The offset-to-top field is at index -2 from the vptr. */ |
4a90aeeb | 198 | index = build_int_cst (NULL_TREE, |
7d60be94 | 199 | -2 * TARGET_VTABLE_DATA_ENTRY_DISTANCE); |
da3d4dfa | 200 | |
dd865ef6 | 201 | offset = build_vtbl_ref (cp_build_indirect_ref (exp, RO_NULL, |
5ade1ed2 DG |
202 | tf_warning_or_error), |
203 | index); | |
84a43794 | 204 | |
a3360e77 JM |
205 | type = cp_build_qualified_type (ptr_type_node, |
206 | cp_type_quals (TREE_TYPE (exp))); | |
5d49b6a7 | 207 | return fold_build_pointer_plus (exp, offset); |
84a43794 | 208 | } |
5156628f | 209 | |
5156628f MS |
210 | /* Get a bad_cast node for the program to throw... |
211 | ||
212 | See libstdc++/exception.cc for __throw_bad_cast */ | |
213 | ||
214 | static tree | |
848eed92 | 215 | throw_bad_cast (void) |
5156628f | 216 | { |
1f84ec23 | 217 | tree fn = get_identifier ("__cxa_bad_cast"); |
c003e212 | 218 | if (!get_global_value_if_present (fn, &fn)) |
0244e6f7 NF |
219 | fn = push_throw_library_fn (fn, build_function_type_list (ptr_type_node, |
220 | NULL_TREE)); | |
c8094d83 | 221 | |
e2e03032 | 222 | return build_cxx_call (fn, 0, NULL, tf_warning_or_error); |
5156628f MS |
223 | } |
224 | ||
2050a1bb MM |
225 | /* Return an expression for "__cxa_bad_typeid()". The expression |
226 | returned is an lvalue of type "const std::type_info". */ | |
227 | ||
5156628f | 228 | static tree |
848eed92 | 229 | throw_bad_typeid (void) |
5156628f | 230 | { |
1f84ec23 | 231 | tree fn = get_identifier ("__cxa_bad_typeid"); |
c003e212 | 232 | if (!get_global_value_if_present (fn, &fn)) |
cf74fb86 | 233 | { |
db24eb1f NS |
234 | tree t; |
235 | ||
236 | t = build_reference_type (const_type_info_type_node); | |
0244e6f7 | 237 | t = build_function_type_list (t, NULL_TREE); |
cf74fb86 JM |
238 | fn = push_throw_library_fn (fn, t); |
239 | } | |
059fa5e7 | 240 | |
e2e03032 | 241 | return build_cxx_call (fn, 0, NULL, tf_warning_or_error); |
5156628f | 242 | } |
84a43794 | 243 | \f |
2050a1bb MM |
244 | /* Return an lvalue expression whose type is "const std::type_info" |
245 | and whose value indicates the type of the expression EXP. If EXP | |
246 | is a reference to a polymorphic class, return the dynamic type; | |
5156628f | 247 | otherwise return the static type of the expression. */ |
e92cc029 | 248 | |
e5f614d7 | 249 | static tree |
795801d6 | 250 | get_tinfo_decl_dynamic (tree exp, tsubst_flags_t complain) |
84a43794 MS |
251 | { |
252 | tree type; | |
2050a1bb | 253 | tree t; |
c8094d83 | 254 | |
717f8053 | 255 | if (error_operand_p (exp)) |
84a43794 MS |
256 | return error_mark_node; |
257 | ||
6780e186 JM |
258 | exp = resolve_nondeduced_context (exp); |
259 | ||
e92cc029 | 260 | /* peel back references, so they match. */ |
ee76b931 | 261 | type = non_reference (TREE_TYPE (exp)); |
84a43794 | 262 | |
e92cc029 | 263 | /* Peel off cv qualifiers. */ |
84a43794 | 264 | type = TYPE_MAIN_VARIANT (type); |
c8094d83 | 265 | |
41b059f3 | 266 | /* For UNKNOWN_TYPEs call complete_type_or_else to get diagnostics. */ |
fbfc8363 JM |
267 | if (CLASS_TYPE_P (type) || type == unknown_type_node |
268 | || type == init_list_type_node) | |
795801d6 | 269 | type = complete_type_or_maybe_complain (type, exp, complain); |
c8094d83 | 270 | |
e5f614d7 NS |
271 | if (!type) |
272 | return error_mark_node; | |
6a8f78d5 | 273 | |
84a43794 | 274 | /* If exp is a reference to polymorphic type, get the real type_info. */ |
4c6b7393 | 275 | if (TYPE_POLYMORPHIC_P (type) && ! resolves_to_fixed_type_p (exp, 0)) |
84a43794 MS |
276 | { |
277 | /* build reference to type_info from vtable. */ | |
da3d4dfa | 278 | tree index; |
84a43794 | 279 | |
8fa33dfa | 280 | /* The RTTI information is at index -1. */ |
4a90aeeb | 281 | index = build_int_cst (NULL_TREE, |
7d60be94 | 282 | -1 * TARGET_VTABLE_DATA_ENTRY_DISTANCE); |
b5d1cbd2 | 283 | t = build_vtbl_ref (exp, index); |
6de9cd9a | 284 | t = convert (type_info_ptr_type, t); |
84a43794 | 285 | } |
2050a1bb MM |
286 | else |
287 | /* Otherwise return the type_info for the static type of the expr. */ | |
288 | t = get_tinfo_ptr (TYPE_MAIN_VARIANT (type)); | |
84a43794 | 289 | |
795801d6 | 290 | return cp_build_indirect_ref (t, RO_NULL, complain); |
5156628f MS |
291 | } |
292 | ||
7f54a851 | 293 | static bool |
848eed92 | 294 | typeid_ok_p (void) |
5156628f | 295 | { |
3a44f395 JJ |
296 | tree pseudo_type_info, type_info_type; |
297 | ||
f915e937 NS |
298 | if (! flag_rtti) |
299 | { | |
300 | error ("cannot use typeid with -fno-rtti"); | |
7f54a851 | 301 | return false; |
f915e937 | 302 | } |
c8094d83 | 303 | |
db24eb1f | 304 | if (!COMPLETE_TYPE_P (const_type_info_type_node)) |
6a8f78d5 JM |
305 | { |
306 | error ("must #include <typeinfo> before using typeid"); | |
7f54a851 | 307 | return false; |
6a8f78d5 | 308 | } |
c8094d83 | 309 | |
9771b263 | 310 | pseudo_type_info = (*tinfo_descs)[TK_TYPE_INFO_TYPE].type; |
3a44f395 JJ |
311 | type_info_type = TYPE_MAIN_VARIANT (const_type_info_type_node); |
312 | ||
313 | /* Make sure abi::__type_info_pseudo has the same alias set | |
314 | as std::type_info. */ | |
315 | if (! TYPE_ALIAS_SET_KNOWN_P (pseudo_type_info)) | |
316 | TYPE_ALIAS_SET (pseudo_type_info) = get_alias_set (type_info_type); | |
317 | else | |
318 | gcc_assert (TYPE_ALIAS_SET (pseudo_type_info) | |
319 | == get_alias_set (type_info_type)); | |
320 | ||
7f54a851 NS |
321 | return true; |
322 | } | |
323 | ||
2050a1bb MM |
324 | /* Return an expression for "typeid(EXP)". The expression returned is |
325 | an lvalue of type "const std::type_info". */ | |
326 | ||
7f54a851 | 327 | tree |
795801d6 | 328 | build_typeid (tree exp, tsubst_flags_t complain) |
7f54a851 | 329 | { |
03a904b5 | 330 | tree cond = NULL_TREE, initial_expr = exp; |
7f54a851 NS |
331 | int nonnull = 0; |
332 | ||
333 | if (exp == error_mark_node || !typeid_ok_p ()) | |
334 | return error_mark_node; | |
335 | ||
5156628f | 336 | if (processing_template_decl) |
db24eb1f | 337 | return build_min (TYPEID_EXPR, const_type_info_type_node, exp); |
5156628f | 338 | |
fa2200cb JM |
339 | /* FIXME when integrating with c_fully_fold, mark |
340 | resolves_to_fixed_type_p case as a non-constant expression. */ | |
c87e82a6 | 341 | if (TYPE_POLYMORPHIC_P (TREE_TYPE (exp)) |
5156628f MS |
342 | && ! resolves_to_fixed_type_p (exp, &nonnull) |
343 | && ! nonnull) | |
344 | { | |
03a904b5 | 345 | /* So we need to look into the vtable of the type of exp. |
c87e82a6 JM |
346 | Make sure it isn't a null lvalue. */ |
347 | exp = cp_build_addr_expr (exp, complain); | |
5156628f | 348 | exp = stabilize_reference (exp); |
c87e82a6 JM |
349 | cond = cp_convert (boolean_type_node, exp, complain); |
350 | exp = cp_build_indirect_ref (exp, RO_NULL, complain); | |
5156628f MS |
351 | } |
352 | ||
795801d6 | 353 | exp = get_tinfo_decl_dynamic (exp, complain); |
9a3b49ac MS |
354 | |
355 | if (exp == error_mark_node) | |
356 | return error_mark_node; | |
357 | ||
5156628f MS |
358 | if (cond) |
359 | { | |
360 | tree bad = throw_bad_typeid (); | |
361 | ||
f293ce4b | 362 | exp = build3 (COND_EXPR, TREE_TYPE (exp), cond, exp, bad); |
5156628f | 363 | } |
03a904b5 JJ |
364 | else |
365 | mark_type_use (initial_expr); | |
5156628f | 366 | |
2050a1bb | 367 | return exp; |
84a43794 MS |
368 | } |
369 | ||
52669d59 JQ |
370 | /* Generate the NTBS name of a type. If MARK_PRIVATE, put a '*' in front so that |
371 | comparisons will be done by pointer rather than string comparison. */ | |
db1147b2 | 372 | static tree |
52669d59 | 373 | tinfo_name (tree type, bool mark_private) |
db1147b2 | 374 | { |
1f6e1acc | 375 | const char *name; |
52669d59 | 376 | int length; |
1f6e1acc AS |
377 | tree name_string; |
378 | ||
52669d59 JQ |
379 | name = mangle_type_string (type); |
380 | length = strlen (name); | |
381 | ||
382 | if (mark_private) | |
383 | { | |
384 | /* Inject '*' at beginning of name to force pointer comparison. */ | |
c86f25e8 | 385 | char* buf = (char*) XALLOCAVEC (char, length + 2); |
52669d59 | 386 | buf[0] = '*'; |
c86f25e8 JM |
387 | memcpy (buf + 1, name, length + 1); |
388 | name_string = build_string (length + 2, buf); | |
52669d59 JQ |
389 | } |
390 | else | |
391 | name_string = build_string (length + 1, name); | |
392 | ||
393 | return fix_string_type (name_string); | |
db1147b2 NS |
394 | } |
395 | ||
d689a8f1 NS |
396 | /* Return a VAR_DECL for the internal ABI defined type_info object for |
397 | TYPE. You must arrange that the decl is mark_used, if actually use | |
c8094d83 | 398 | it --- decls in vtables are only used if the vtable is output. */ |
794d4a61 | 399 | |
6b5fbb55 | 400 | tree |
848eed92 | 401 | get_tinfo_decl (tree type) |
6b5fbb55 | 402 | { |
9a3b49ac | 403 | tree name; |
6b5fbb55 MS |
404 | tree d; |
405 | ||
f19218e5 | 406 | if (variably_modified_type_p (type, /*fn=*/NULL_TREE)) |
0c918ce5 | 407 | { |
94a073b2 JM |
408 | error ("cannot create type information for type %qT because " |
409 | "it involves types of variable size", | |
410 | type); | |
0c918ce5 MM |
411 | return error_mark_node; |
412 | } | |
413 | ||
9a3b49ac MS |
414 | if (TREE_CODE (type) == METHOD_TYPE) |
415 | type = build_function_type (TREE_TYPE (type), | |
416 | TREE_CHAIN (TYPE_ARG_TYPES (type))); | |
417 | ||
17d208b5 JM |
418 | type = complete_type (type); |
419 | ||
a82d6da5 MM |
420 | /* For a class type, the variable is cached in the type node |
421 | itself. */ | |
422 | if (CLASS_TYPE_P (type)) | |
423 | { | |
424 | d = CLASSTYPE_TYPEINFO_VAR (TYPE_MAIN_VARIANT (type)); | |
425 | if (d) | |
426 | return d; | |
427 | } | |
c8094d83 | 428 | |
1f84ec23 | 429 | name = mangle_typeinfo_for_type (type); |
669ec2b4 | 430 | |
7267d692 | 431 | d = IDENTIFIER_GLOBAL_VALUE (name); |
d689a8f1 | 432 | if (!d) |
7267d692 | 433 | { |
fe93f42f | 434 | int ix = get_pseudo_ti_index (type); |
9771b263 | 435 | tinfo_s *ti = &(*tinfo_descs)[ix]; |
d689a8f1 | 436 | |
1bf5fc34 | 437 | d = build_lang_decl (VAR_DECL, name, ti->type); |
4684cd27 | 438 | SET_DECL_ASSEMBLER_NAME (d, name); |
73a8adb6 MM |
439 | /* Remember the type it is for. */ |
440 | TREE_TYPE (name) = type; | |
4684cd27 | 441 | DECL_TINFO_P (d) = 1; |
7267d692 | 442 | DECL_ARTIFICIAL (d) = 1; |
78e0d62b | 443 | DECL_IGNORED_P (d) = 1; |
7267d692 NS |
444 | TREE_READONLY (d) = 1; |
445 | TREE_STATIC (d) = 1; | |
4684cd27 MM |
446 | /* Mark the variable as undefined -- but remember that we can |
447 | define it later if we need to do so. */ | |
7267d692 | 448 | DECL_EXTERNAL (d) = 1; |
4684cd27 | 449 | DECL_NOT_REALLY_EXTERN (d) = 1; |
d71176b6 GK |
450 | set_linkage_according_to_type (type, d); |
451 | ||
452 | d = pushdecl_top_level_and_finish (d, NULL_TREE); | |
73a8adb6 MM |
453 | if (CLASS_TYPE_P (type)) |
454 | CLASSTYPE_TYPEINFO_VAR (TYPE_MAIN_VARIANT (type)) = d; | |
d689a8f1 | 455 | |
9bcb9aae | 456 | /* Add decl to the global array of tinfo decls. */ |
9771b263 | 457 | vec_safe_push (unemitted_tinfo_decls, d); |
7267d692 | 458 | } |
d689a8f1 | 459 | |
6b5fbb55 MS |
460 | return d; |
461 | } | |
462 | ||
d689a8f1 NS |
463 | /* Return a pointer to a type_info object describing TYPE, suitably |
464 | cast to the language defined type. */ | |
465 | ||
466 | static tree | |
848eed92 | 467 | get_tinfo_ptr (tree type) |
d689a8f1 | 468 | { |
bb4f6e6b JH |
469 | tree decl = get_tinfo_decl (type); |
470 | ||
471 | mark_used (decl); | |
c8094d83 | 472 | return build_nop (type_info_ptr_type, |
bb4f6e6b | 473 | build_address (decl)); |
d689a8f1 NS |
474 | } |
475 | ||
e5f614d7 | 476 | /* Return the type_info object for TYPE. */ |
e92cc029 | 477 | |
84a43794 | 478 | tree |
795801d6 | 479 | get_typeid (tree type, tsubst_flags_t complain) |
84a43794 | 480 | { |
7f54a851 | 481 | if (type == error_mark_node || !typeid_ok_p ()) |
84a43794 | 482 | return error_mark_node; |
c8094d83 | 483 | |
e9f32eb5 | 484 | if (processing_template_decl) |
db24eb1f | 485 | return build_min (TYPEID_EXPR, const_type_info_type_node, type); |
e9f32eb5 | 486 | |
6b5fbb55 MS |
487 | /* If the type of the type-id is a reference type, the result of the |
488 | typeid expression refers to a type_info object representing the | |
489 | referenced type. */ | |
ee76b931 | 490 | type = non_reference (type); |
84a43794 | 491 | |
80f7a782 JM |
492 | /* This is not one of the uses of a qualified function type in 8.3.5. */ |
493 | if (TREE_CODE (type) == FUNCTION_TYPE | |
494 | && (type_memfn_quals (type) != TYPE_UNQUALIFIED | |
495 | || type_memfn_rqual (type) != REF_QUAL_NONE)) | |
496 | { | |
497 | if (complain & tf_error) | |
498 | error ("typeid of qualified function type %qT", type); | |
499 | return error_mark_node; | |
500 | } | |
501 | ||
6b5fbb55 | 502 | /* The top-level cv-qualifiers of the lvalue expression or the type-id |
e92cc029 | 503 | that is the operand of typeid are always ignored. */ |
6b5fbb55 | 504 | type = TYPE_MAIN_VARIANT (type); |
84a43794 | 505 | |
41b059f3 | 506 | /* For UNKNOWN_TYPEs call complete_type_or_else to get diagnostics. */ |
fbfc8363 JM |
507 | if (CLASS_TYPE_P (type) || type == unknown_type_node |
508 | || type == init_list_type_node) | |
795801d6 | 509 | type = complete_type_or_maybe_complain (type, NULL_TREE, complain); |
c8094d83 | 510 | |
e5f614d7 NS |
511 | if (!type) |
512 | return error_mark_node; | |
6a8f78d5 | 513 | |
795801d6 | 514 | return cp_build_indirect_ref (get_tinfo_ptr (type), RO_NULL, complain); |
84a43794 MS |
515 | } |
516 | ||
a80e4195 MS |
517 | /* Check whether TEST is null before returning RESULT. If TEST is used in |
518 | RESULT, it must have previously had a save_expr applied to it. */ | |
519 | ||
824b9a4c | 520 | static tree |
4b978f96 | 521 | ifnonnull (tree test, tree result, tsubst_flags_t complain) |
a80e4195 | 522 | { |
f293ce4b | 523 | return build3 (COND_EXPR, TREE_TYPE (result), |
c8094d83 | 524 | build2 (EQ_EXPR, boolean_type_node, test, |
4b978f96 PC |
525 | cp_convert (TREE_TYPE (test), nullptr_node, |
526 | complain)), | |
527 | cp_convert (TREE_TYPE (result), nullptr_node, complain), | |
f293ce4b | 528 | result); |
a80e4195 MS |
529 | } |
530 | ||
84a43794 MS |
531 | /* Execute a dynamic cast, as described in section 5.2.6 of the 9/93 working |
532 | paper. */ | |
6b5fbb55 | 533 | |
42976354 | 534 | static tree |
5ade1ed2 | 535 | build_dynamic_cast_1 (tree type, tree expr, tsubst_flags_t complain) |
84a43794 MS |
536 | { |
537 | enum tree_code tc = TREE_CODE (type); | |
63891ba2 | 538 | tree exprtype; |
6b5fbb55 | 539 | tree dcast_fn; |
6a8f78d5 | 540 | tree old_expr = expr; |
c2e407f1 | 541 | const char *errstr = NULL; |
84a43794 | 542 | |
8d8d1a28 AH |
543 | /* Save casted types in the function's used types hash table. */ |
544 | used_types_insert (type); | |
545 | ||
64b83f2a SG |
546 | /* T shall be a pointer or reference to a complete class type, or |
547 | `pointer to cv void''. */ | |
84a43794 MS |
548 | switch (tc) |
549 | { | |
550 | case POINTER_TYPE: | |
50e10fa8 | 551 | if (VOID_TYPE_P (TREE_TYPE (type))) |
84a43794 | 552 | break; |
db24eb1f | 553 | /* Fall through. */ |
84a43794 | 554 | case REFERENCE_TYPE: |
9e1e64ec | 555 | if (! MAYBE_CLASS_TYPE_P (TREE_TYPE (type))) |
64b83f2a | 556 | { |
4cd5a50a | 557 | errstr = _("target is not pointer or reference to class"); |
64b83f2a SG |
558 | goto fail; |
559 | } | |
d0f062fb | 560 | if (!COMPLETE_TYPE_P (complete_type (TREE_TYPE (type)))) |
64b83f2a | 561 | { |
4cd5a50a | 562 | errstr = _("target is not pointer or reference to complete type"); |
64b83f2a SG |
563 | goto fail; |
564 | } | |
cdf5b885 | 565 | break; |
64b83f2a | 566 | |
84a43794 | 567 | default: |
4cd5a50a | 568 | errstr = _("target is not pointer or reference"); |
84a43794 MS |
569 | goto fail; |
570 | } | |
571 | ||
64b83f2a | 572 | if (tc == POINTER_TYPE) |
84a43794 | 573 | { |
89fcabaf | 574 | expr = decay_conversion (expr, complain); |
63891ba2 PC |
575 | exprtype = TREE_TYPE (expr); |
576 | ||
64b83f2a SG |
577 | /* If T is a pointer type, v shall be an rvalue of a pointer to |
578 | complete class type, and the result is an rvalue of type T. */ | |
579 | ||
03a904b5 JJ |
580 | expr = mark_rvalue_use (expr); |
581 | ||
50e10fa8 | 582 | if (!TYPE_PTR_P (exprtype)) |
64b83f2a | 583 | { |
4cd5a50a | 584 | errstr = _("source is not a pointer"); |
64b83f2a SG |
585 | goto fail; |
586 | } | |
9e1e64ec | 587 | if (! MAYBE_CLASS_TYPE_P (TREE_TYPE (exprtype))) |
64b83f2a | 588 | { |
4cd5a50a | 589 | errstr = _("source is not a pointer to class"); |
64b83f2a SG |
590 | goto fail; |
591 | } | |
d0f062fb | 592 | if (!COMPLETE_TYPE_P (complete_type (TREE_TYPE (exprtype)))) |
64b83f2a | 593 | { |
4cd5a50a | 594 | errstr = _("source is a pointer to incomplete type"); |
64b83f2a SG |
595 | goto fail; |
596 | } | |
597 | } | |
598 | else | |
599 | { | |
03a904b5 JJ |
600 | expr = mark_lvalue_use (expr); |
601 | ||
63891ba2 | 602 | exprtype = build_reference_type (TREE_TYPE (expr)); |
db24eb1f | 603 | |
64b83f2a SG |
604 | /* T is a reference type, v shall be an lvalue of a complete class |
605 | type, and the result is an lvalue of the type referred to by T. */ | |
606 | ||
9e1e64ec | 607 | if (! MAYBE_CLASS_TYPE_P (TREE_TYPE (exprtype))) |
64b83f2a | 608 | { |
4cd5a50a | 609 | errstr = _("source is not of class type"); |
64b83f2a SG |
610 | goto fail; |
611 | } | |
d0f062fb | 612 | if (!COMPLETE_TYPE_P (complete_type (TREE_TYPE (exprtype)))) |
64b83f2a | 613 | { |
4cd5a50a | 614 | errstr = _("source is of incomplete class type"); |
64b83f2a SG |
615 | goto fail; |
616 | } | |
64b83f2a SG |
617 | } |
618 | ||
619 | /* The dynamic_cast operator shall not cast away constness. */ | |
620 | if (!at_least_as_qualified_p (TREE_TYPE (type), | |
621 | TREE_TYPE (exprtype))) | |
622 | { | |
4cd5a50a | 623 | errstr = _("conversion casts away constness"); |
64b83f2a | 624 | goto fail; |
84a43794 MS |
625 | } |
626 | ||
627 | /* If *type is an unambiguous accessible base class of *exprtype, | |
628 | convert statically. */ | |
629 | { | |
ffe7516f PC |
630 | tree binfo = lookup_base (TREE_TYPE (exprtype), TREE_TYPE (type), |
631 | ba_check, NULL, complain); | |
338d90b8 | 632 | if (binfo) |
ffe7516f | 633 | return build_static_cast (type, expr, complain); |
84a43794 MS |
634 | } |
635 | ||
d1522e8f JM |
636 | /* Apply trivial conversion T -> T& for dereferenced ptrs. */ |
637 | if (tc == REFERENCE_TYPE) | |
638 | expr = convert_to_reference (exprtype, expr, CONV_IMPLICIT, | |
639 | LOOKUP_NORMAL, NULL_TREE, complain); | |
640 | ||
84a43794 | 641 | /* Otherwise *exprtype must be a polymorphic class (have a vtbl). */ |
4c6b7393 | 642 | if (TYPE_POLYMORPHIC_P (TREE_TYPE (exprtype))) |
84a43794 | 643 | { |
a80e4195 | 644 | tree expr1; |
84a43794 | 645 | /* if TYPE is `void *', return pointer to complete object. */ |
b72801e2 | 646 | if (tc == POINTER_TYPE && VOID_TYPE_P (TREE_TYPE (type))) |
84a43794 MS |
647 | { |
648 | /* if b is an object, dynamic_cast<void *>(&b) == (void *)&b. */ | |
649 | if (TREE_CODE (expr) == ADDR_EXPR | |
5a6ccc94 | 650 | && VAR_P (TREE_OPERAND (expr, 0)) |
84a43794 MS |
651 | && TREE_CODE (TREE_TYPE (TREE_OPERAND (expr, 0))) == RECORD_TYPE) |
652 | return build1 (NOP_EXPR, type, expr); | |
653 | ||
a80e4195 MS |
654 | /* Since expr is used twice below, save it. */ |
655 | expr = save_expr (expr); | |
656 | ||
657 | expr1 = build_headof (expr); | |
658 | if (TREE_TYPE (expr1) != type) | |
659 | expr1 = build1 (NOP_EXPR, type, expr1); | |
4b978f96 | 660 | return ifnonnull (expr, expr1, complain); |
84a43794 MS |
661 | } |
662 | else | |
663 | { | |
664 | tree retval; | |
94a0dd7b SL |
665 | tree result, td2, td3; |
666 | tree elems[4]; | |
0cbd7506 | 667 | tree static_type, target_type, boff; |
84a43794 | 668 | |
0cbd7506 | 669 | /* If we got here, we can't convert statically. Therefore, |
84a43794 | 670 | dynamic_cast<D&>(b) (b an object) cannot succeed. */ |
64b83f2a | 671 | if (tc == REFERENCE_TYPE) |
84a43794 | 672 | { |
5a6ccc94 | 673 | if (VAR_P (old_expr) |
6a8f78d5 | 674 | && TREE_CODE (TREE_TYPE (old_expr)) == RECORD_TYPE) |
84a43794 | 675 | { |
0cbd7506 | 676 | tree expr = throw_bad_cast (); |
5ade1ed2 DG |
677 | if (complain & tf_warning) |
678 | warning (0, "dynamic_cast of %q#D to %q#T can never succeed", | |
679 | old_expr, type); | |
0cbd7506 MS |
680 | /* Bash it to the expected type. */ |
681 | TREE_TYPE (expr) = type; | |
059fa5e7 | 682 | return expr; |
84a43794 MS |
683 | } |
684 | } | |
685 | /* Ditto for dynamic_cast<D*>(&b). */ | |
686 | else if (TREE_CODE (expr) == ADDR_EXPR) | |
687 | { | |
688 | tree op = TREE_OPERAND (expr, 0); | |
5a6ccc94 | 689 | if (VAR_P (op) |
84a43794 MS |
690 | && TREE_CODE (TREE_TYPE (op)) == RECORD_TYPE) |
691 | { | |
5ade1ed2 DG |
692 | if (complain & tf_warning) |
693 | warning (0, "dynamic_cast of %q#D to %q#T can never succeed", | |
694 | op, type); | |
c8094d83 | 695 | retval = build_int_cst (type, 0); |
84a43794 MS |
696 | return retval; |
697 | } | |
698 | } | |
699 | ||
6c9384c3 BS |
700 | /* Use of dynamic_cast when -fno-rtti is prohibited. */ |
701 | if (!flag_rtti) | |
702 | { | |
5ade1ed2 DG |
703 | if (complain & tf_error) |
704 | error ("%<dynamic_cast%> not permitted with -fno-rtti"); | |
6c9384c3 BS |
705 | return error_mark_node; |
706 | } | |
707 | ||
7267d692 NS |
708 | target_type = TYPE_MAIN_VARIANT (TREE_TYPE (type)); |
709 | static_type = TYPE_MAIN_VARIANT (TREE_TYPE (exprtype)); | |
bb4f6e6b JH |
710 | td2 = get_tinfo_decl (target_type); |
711 | mark_used (td2); | |
93c0e0bb | 712 | td2 = cp_build_addr_expr (td2, complain); |
bb4f6e6b JH |
713 | td3 = get_tinfo_decl (static_type); |
714 | mark_used (td3); | |
93c0e0bb | 715 | td3 = cp_build_addr_expr (td3, complain); |
7267d692 | 716 | |
0cbd7506 MS |
717 | /* Determine how T and V are related. */ |
718 | boff = dcast_base_hint (static_type, target_type); | |
c8094d83 | 719 | |
6b5fbb55 MS |
720 | /* Since expr is used twice below, save it. */ |
721 | expr = save_expr (expr); | |
722 | ||
84a43794 MS |
723 | expr1 = expr; |
724 | if (tc == REFERENCE_TYPE) | |
93c0e0bb | 725 | expr1 = cp_build_addr_expr (expr1, complain); |
84a43794 | 726 | |
94a0dd7b SL |
727 | elems[0] = expr1; |
728 | elems[1] = td3; | |
729 | elems[2] = td2; | |
730 | elems[3] = boff; | |
6b5fbb55 | 731 | |
059fa5e7 NS |
732 | dcast_fn = dynamic_cast_node; |
733 | if (!dcast_fn) | |
6b5fbb55 MS |
734 | { |
735 | tree tmp; | |
7267d692 | 736 | tree tinfo_ptr; |
7267d692 | 737 | const char *name; |
c8094d83 | 738 | |
a15f0fd0 | 739 | push_abi_namespace (); |
88e5899c | 740 | tinfo_ptr = xref_tag (class_type, |
8fa33dfa | 741 | get_identifier ("__class_type_info"), |
bd3d082e | 742 | /*tag_scope=*/ts_current, false); |
c8094d83 | 743 | |
8fa33dfa | 744 | tinfo_ptr = build_pointer_type |
a3360e77 | 745 | (cp_build_qualified_type |
8fa33dfa MM |
746 | (tinfo_ptr, TYPE_QUAL_CONST)); |
747 | name = "__dynamic_cast"; | |
0244e6f7 NF |
748 | tmp = build_function_type_list (ptr_type_node, |
749 | const_ptr_type_node, | |
750 | tinfo_ptr, tinfo_ptr, | |
751 | ptrdiff_type_node, NULL_TREE); | |
fafa0521 JH |
752 | dcast_fn = build_library_fn_ptr (name, tmp, |
753 | ECF_LEAF | ECF_PURE | ECF_NOTHROW); | |
a15f0fd0 | 754 | pop_abi_namespace (); |
0cbd7506 | 755 | dynamic_cast_node = dcast_fn; |
6b5fbb55 | 756 | } |
e2e03032 | 757 | result = build_cxx_call (dcast_fn, 4, elems, complain); |
84a43794 MS |
758 | |
759 | if (tc == REFERENCE_TYPE) | |
760 | { | |
7267d692 | 761 | tree bad = throw_bad_cast (); |
a0c04f8e | 762 | tree neq; |
c8094d83 | 763 | |
84a43794 | 764 | result = save_expr (result); |
23ffb99e | 765 | neq = cp_truthvalue_conversion (result); |
c74147d2 RG |
766 | return cp_convert (type, |
767 | build3 (COND_EXPR, TREE_TYPE (result), | |
4b978f96 | 768 | neq, result, bad), complain); |
84a43794 MS |
769 | } |
770 | ||
e92cc029 | 771 | /* Now back to the type we want from a void*. */ |
4b978f96 PC |
772 | result = cp_convert (type, result, complain); |
773 | return ifnonnull (expr, result, complain); | |
84a43794 MS |
774 | } |
775 | } | |
64b83f2a | 776 | else |
4cd5a50a | 777 | errstr = _("source type is not polymorphic"); |
0f4d5c1c | 778 | |
84a43794 | 779 | fail: |
5ade1ed2 DG |
780 | if (complain & tf_error) |
781 | error ("cannot dynamic_cast %qE (of type %q#T) to type %q#T (%s)", | |
63891ba2 | 782 | old_expr, TREE_TYPE (old_expr), type, errstr); |
84a43794 MS |
783 | return error_mark_node; |
784 | } | |
42976354 BK |
785 | |
786 | tree | |
5ade1ed2 | 787 | build_dynamic_cast (tree type, tree expr, tsubst_flags_t complain) |
42976354 | 788 | { |
04398fa8 PC |
789 | tree r; |
790 | ||
328d03d7 JM |
791 | if (type == error_mark_node || expr == error_mark_node) |
792 | return error_mark_node; | |
c8094d83 | 793 | |
328d03d7 | 794 | if (processing_template_decl) |
8e1daa34 NS |
795 | { |
796 | expr = build_min (DYNAMIC_CAST_EXPR, type, expr); | |
797 | TREE_SIDE_EFFECTS (expr) = 1; | |
61a861e6 | 798 | return convert_from_reference (expr); |
8e1daa34 | 799 | } |
328d03d7 | 800 | |
04398fa8 PC |
801 | r = convert_from_reference (build_dynamic_cast_1 (type, expr, complain)); |
802 | if (r != error_mark_node) | |
803 | maybe_warn_about_useless_cast (type, expr, complain); | |
804 | return r; | |
42976354 | 805 | } |
04398fa8 | 806 | |
7267d692 NS |
807 | /* Return the runtime bit mask encoding the qualifiers of TYPE. */ |
808 | ||
809 | static int | |
848eed92 | 810 | qualifier_flags (tree type) |
7267d692 NS |
811 | { |
812 | int flags = 0; | |
05abed76 | 813 | int quals = cp_type_quals (type); |
c8094d83 | 814 | |
7267d692 NS |
815 | if (quals & TYPE_QUAL_CONST) |
816 | flags |= 1; | |
817 | if (quals & TYPE_QUAL_VOLATILE) | |
818 | flags |= 2; | |
6d61f400 NS |
819 | if (quals & TYPE_QUAL_RESTRICT) |
820 | flags |= 4; | |
7267d692 NS |
821 | return flags; |
822 | } | |
823 | ||
848eed92 | 824 | /* Return true, if the pointer chain TYPE ends at an incomplete type, or |
0a240972 NS |
825 | contains a pointer to member of an incomplete class. */ |
826 | ||
848eed92 GDR |
827 | static bool |
828 | target_incomplete_p (tree type) | |
0a240972 | 829 | { |
a5ac359a | 830 | while (true) |
66b1156a | 831 | if (TYPE_PTRDATAMEM_P (type)) |
0a240972 | 832 | { |
a5ac359a MM |
833 | if (!COMPLETE_TYPE_P (TYPE_PTRMEM_CLASS_TYPE (type))) |
834 | return true; | |
835 | type = TYPE_PTRMEM_POINTED_TO_TYPE (type); | |
0a240972 | 836 | } |
50e10fa8 | 837 | else if (TYPE_PTR_P (type)) |
0a240972 | 838 | type = TREE_TYPE (type); |
a5ac359a MM |
839 | else |
840 | return !COMPLETE_OR_VOID_TYPE_P (type); | |
0a240972 NS |
841 | } |
842 | ||
4684cd27 MM |
843 | /* Returns true if TYPE involves an incomplete class type; in that |
844 | case, typeinfo variables for TYPE should be emitted with internal | |
845 | linkage. */ | |
846 | ||
847 | static bool | |
848 | involves_incomplete_p (tree type) | |
849 | { | |
850 | switch (TREE_CODE (type)) | |
851 | { | |
852 | case POINTER_TYPE: | |
853 | return target_incomplete_p (TREE_TYPE (type)); | |
854 | ||
855 | case OFFSET_TYPE: | |
856 | ptrmem: | |
c8094d83 | 857 | return |
4684cd27 MM |
858 | (target_incomplete_p (TYPE_PTRMEM_POINTED_TO_TYPE (type)) |
859 | || !COMPLETE_TYPE_P (TYPE_PTRMEM_CLASS_TYPE (type))); | |
860 | ||
861 | case RECORD_TYPE: | |
862 | if (TYPE_PTRMEMFUNC_P (type)) | |
863 | goto ptrmem; | |
864 | /* Fall through. */ | |
865 | case UNION_TYPE: | |
866 | if (!COMPLETE_TYPE_P (type)) | |
867 | return true; | |
868 | ||
869 | default: | |
870 | /* All other types do not involve incomplete class types. */ | |
871 | return false; | |
872 | } | |
873 | } | |
874 | ||
7267d692 | 875 | /* Return a CONSTRUCTOR for the common part of the type_info objects. This |
0a240972 NS |
876 | is the vtable pointer and NTBS name. The NTBS name is emitted as a |
877 | comdat const char array, so it becomes a unique key for the type. Generate | |
878 | and emit that VAR_DECL here. (We can't always emit the type_info itself | |
879 | as comdat, because of pointers to incomplete.) */ | |
7267d692 NS |
880 | |
881 | static tree | |
1bf5fc34 | 882 | tinfo_base_init (tinfo_s *ti, tree target) |
7267d692 | 883 | { |
e20463aa | 884 | tree init; |
0a240972 | 885 | tree name_decl; |
d689a8f1 | 886 | tree vtable_ptr; |
9771b263 | 887 | vec<constructor_elt, va_gc> *v; |
c8094d83 | 888 | |
0a240972 | 889 | { |
52669d59 | 890 | tree name_name, name_string; |
c8094d83 | 891 | |
0a240972 | 892 | /* Generate the NTBS array variable. */ |
0a240972 | 893 | tree name_type = build_cplus_array_type |
a3360e77 | 894 | (cp_build_qualified_type (char_type_node, TYPE_QUAL_CONST), |
0cbd7506 | 895 | NULL_TREE); |
1f6e1acc | 896 | |
4684cd27 MM |
897 | /* Determine the name of the variable -- and remember with which |
898 | type it is associated. */ | |
1f84ec23 | 899 | name_name = mangle_typeinfo_string_for_type (target); |
4684cd27 MM |
900 | TREE_TYPE (name_name) = target; |
901 | ||
0a240972 | 902 | name_decl = build_lang_decl (VAR_DECL, name_name, name_type); |
73a8adb6 | 903 | SET_DECL_ASSEMBLER_NAME (name_decl, name_name); |
0a240972 | 904 | DECL_ARTIFICIAL (name_decl) = 1; |
78e0d62b | 905 | DECL_IGNORED_P (name_decl) = 1; |
0a240972 NS |
906 | TREE_READONLY (name_decl) = 1; |
907 | TREE_STATIC (name_decl) = 1; | |
908 | DECL_EXTERNAL (name_decl) = 0; | |
4684cd27 | 909 | DECL_TINFO_P (name_decl) = 1; |
6e4be1fa | 910 | set_linkage_according_to_type (target, name_decl); |
4684cd27 | 911 | import_export_decl (name_decl); |
52669d59 | 912 | name_string = tinfo_name (target, !TREE_PUBLIC (name_decl)); |
0a240972 | 913 | DECL_INITIAL (name_decl) = name_string; |
bb4f6e6b | 914 | mark_used (name_decl); |
170b020f | 915 | pushdecl_top_level_and_finish (name_decl, name_string); |
0a240972 | 916 | } |
d689a8f1 | 917 | |
1bf5fc34 | 918 | vtable_ptr = ti->vtable; |
d689a8f1 | 919 | if (!vtable_ptr) |
7267d692 | 920 | { |
d689a8f1 | 921 | tree real_type; |
a15f0fd0 | 922 | push_abi_namespace (); |
1bf5fc34 | 923 | real_type = xref_tag (class_type, ti->name, |
bd3d082e | 924 | /*tag_scope=*/ts_current, false); |
a15f0fd0 | 925 | pop_abi_namespace (); |
c8094d83 | 926 | |
d689a8f1 NS |
927 | if (!COMPLETE_TYPE_P (real_type)) |
928 | { | |
0cbd7506 | 929 | /* We never saw a definition of this type, so we need to |
d689a8f1 NS |
930 | tell the compiler that this is an exported class, as |
931 | indeed all of the __*_type_info classes are. */ | |
932 | SET_CLASSTYPE_INTERFACE_KNOWN (real_type); | |
933 | CLASSTYPE_INTERFACE_ONLY (real_type) = 1; | |
934 | } | |
935 | ||
936 | vtable_ptr = get_vtable_decl (real_type, /*complete=*/1); | |
93c0e0bb | 937 | vtable_ptr = cp_build_addr_expr (vtable_ptr, tf_warning_or_error); |
d689a8f1 NS |
938 | |
939 | /* We need to point into the middle of the vtable. */ | |
5d49b6a7 RG |
940 | vtable_ptr = fold_build_pointer_plus |
941 | (vtable_ptr, | |
d689a8f1 NS |
942 | size_binop (MULT_EXPR, |
943 | size_int (2 * TARGET_VTABLE_DATA_ENTRY_DISTANCE), | |
944 | TYPE_SIZE_UNIT (vtable_entry_type))); | |
3db45ab5 | 945 | |
1bf5fc34 | 946 | ti->vtable = vtable_ptr; |
7267d692 | 947 | } |
d689a8f1 | 948 | |
9771b263 | 949 | vec_alloc (v, 2); |
e20463aa | 950 | CONSTRUCTOR_APPEND_ELT (v, NULL_TREE, vtable_ptr); |
89fcabaf PC |
951 | CONSTRUCTOR_APPEND_ELT (v, NULL_TREE, |
952 | decay_conversion (name_decl, tf_warning_or_error)); | |
c8094d83 | 953 | |
e20463aa | 954 | init = build_constructor (init_list_type_node, v); |
6de9cd9a | 955 | TREE_CONSTANT (init) = 1; |
6de9cd9a | 956 | TREE_STATIC (init) = 1; |
c8094d83 | 957 | |
7267d692 NS |
958 | return init; |
959 | } | |
960 | ||
1bf5fc34 | 961 | /* Return the CONSTRUCTOR expr for a type_info of TYPE. TI provides the |
7267d692 NS |
962 | information about the particular type_info derivation, which adds no |
963 | additional fields to the type_info base. */ | |
964 | ||
965 | static tree | |
1bf5fc34 | 966 | generic_initializer (tinfo_s *ti, tree target) |
7267d692 | 967 | { |
1bf5fc34 | 968 | tree init = tinfo_base_init (ti, target); |
3db45ab5 | 969 | |
e20463aa | 970 | init = build_constructor_single (init_list_type_node, NULL_TREE, init); |
6de9cd9a | 971 | TREE_CONSTANT (init) = 1; |
6de9cd9a | 972 | TREE_STATIC (init) = 1; |
7267d692 NS |
973 | return init; |
974 | } | |
975 | ||
1f4cb92b | 976 | /* Return the CONSTRUCTOR expr for a type_info of pointer TYPE. |
1bf5fc34 | 977 | TI provides information about the particular type_info derivation, |
7267d692 NS |
978 | which adds target type and qualifier flags members to the type_info base. */ |
979 | ||
980 | static tree | |
1bf5fc34 | 981 | ptr_initializer (tinfo_s *ti, tree target) |
7267d692 | 982 | { |
1bf5fc34 | 983 | tree init = tinfo_base_init (ti, target); |
7267d692 NS |
984 | tree to = TREE_TYPE (target); |
985 | int flags = qualifier_flags (to); | |
848eed92 | 986 | bool incomplete = target_incomplete_p (to); |
9771b263 DN |
987 | vec<constructor_elt, va_gc> *v; |
988 | vec_alloc (v, 3); | |
c8094d83 | 989 | |
0a240972 | 990 | if (incomplete) |
4684cd27 | 991 | flags |= 8; |
e20463aa NF |
992 | CONSTRUCTOR_APPEND_ELT (v, NULL_TREE, init); |
993 | CONSTRUCTOR_APPEND_ELT (v, NULL_TREE, build_int_cst (NULL_TREE, flags)); | |
994 | CONSTRUCTOR_APPEND_ELT (v, NULL_TREE, | |
995 | get_tinfo_ptr (TYPE_MAIN_VARIANT (to))); | |
c8094d83 | 996 | |
e20463aa | 997 | init = build_constructor (init_list_type_node, v); |
6de9cd9a | 998 | TREE_CONSTANT (init) = 1; |
6de9cd9a | 999 | TREE_STATIC (init) = 1; |
7267d692 NS |
1000 | return init; |
1001 | } | |
1002 | ||
1f4cb92b | 1003 | /* Return the CONSTRUCTOR expr for a type_info of pointer to member data TYPE. |
1bf5fc34 | 1004 | TI provides information about the particular type_info derivation, |
0a240972 NS |
1005 | which adds class, target type and qualifier flags members to the type_info |
1006 | base. */ | |
7267d692 NS |
1007 | |
1008 | static tree | |
1bf5fc34 | 1009 | ptm_initializer (tinfo_s *ti, tree target) |
7267d692 | 1010 | { |
1bf5fc34 | 1011 | tree init = tinfo_base_init (ti, target); |
7267d692 NS |
1012 | tree to = TYPE_PTRMEM_POINTED_TO_TYPE (target); |
1013 | tree klass = TYPE_PTRMEM_CLASS_TYPE (target); | |
1014 | int flags = qualifier_flags (to); | |
848eed92 | 1015 | bool incomplete = target_incomplete_p (to); |
9771b263 DN |
1016 | vec<constructor_elt, va_gc> *v; |
1017 | vec_alloc (v, 4); | |
c8094d83 | 1018 | |
0a240972 | 1019 | if (incomplete) |
4684cd27 | 1020 | flags |= 0x8; |
0a240972 | 1021 | if (!COMPLETE_TYPE_P (klass)) |
4684cd27 | 1022 | flags |= 0x10; |
e20463aa NF |
1023 | CONSTRUCTOR_APPEND_ELT (v, NULL_TREE, init); |
1024 | CONSTRUCTOR_APPEND_ELT (v, NULL_TREE, build_int_cst (NULL_TREE, flags)); | |
1025 | CONSTRUCTOR_APPEND_ELT (v, NULL_TREE, | |
1026 | get_tinfo_ptr (TYPE_MAIN_VARIANT (to))); | |
1027 | CONSTRUCTOR_APPEND_ELT (v, NULL_TREE, get_tinfo_ptr (klass)); | |
1028 | ||
1029 | init = build_constructor (init_list_type_node, v); | |
6de9cd9a | 1030 | TREE_CONSTANT (init) = 1; |
6de9cd9a | 1031 | TREE_STATIC (init) = 1; |
c8094d83 | 1032 | return init; |
7267d692 NS |
1033 | } |
1034 | ||
7267d692 | 1035 | /* Return the CONSTRUCTOR expr for a type_info of class TYPE. |
1bf5fc34 | 1036 | TI provides information about the particular __class_type_info derivation, |
e20463aa | 1037 | which adds hint flags and N extra initializers to the type_info base. */ |
7267d692 NS |
1038 | |
1039 | static tree | |
e20463aa | 1040 | class_initializer (tinfo_s *ti, tree target, unsigned n, ...) |
7267d692 | 1041 | { |
1bf5fc34 | 1042 | tree init = tinfo_base_init (ti, target); |
e20463aa NF |
1043 | va_list extra_inits; |
1044 | unsigned i; | |
9771b263 DN |
1045 | vec<constructor_elt, va_gc> *v; |
1046 | vec_alloc (v, n+1); | |
e20463aa NF |
1047 | |
1048 | CONSTRUCTOR_APPEND_ELT (v, NULL_TREE, init); | |
1049 | va_start (extra_inits, n); | |
1050 | for (i = 0; i < n; i++) | |
1051 | CONSTRUCTOR_APPEND_ELT (v, NULL_TREE, va_arg (extra_inits, tree)); | |
1052 | va_end (extra_inits); | |
c8094d83 | 1053 | |
e20463aa | 1054 | init = build_constructor (init_list_type_node, v); |
6de9cd9a | 1055 | TREE_CONSTANT (init) = 1; |
6de9cd9a | 1056 | TREE_STATIC (init) = 1; |
c8094d83 | 1057 | return init; |
7267d692 NS |
1058 | } |
1059 | ||
848eed92 | 1060 | /* Returns true if the typeinfo for type should be placed in |
97458258 MM |
1061 | the runtime library. */ |
1062 | ||
848eed92 GDR |
1063 | static bool |
1064 | typeinfo_in_lib_p (tree type) | |
97458258 MM |
1065 | { |
1066 | /* The typeinfo objects for `T*' and `const T*' are in the runtime | |
1067 | library for simple types T. */ | |
50e10fa8 | 1068 | if (TYPE_PTR_P (type) |
89d684bb BM |
1069 | && (cp_type_quals (TREE_TYPE (type)) == TYPE_QUAL_CONST |
1070 | || cp_type_quals (TREE_TYPE (type)) == TYPE_UNQUALIFIED)) | |
97458258 MM |
1071 | type = TREE_TYPE (type); |
1072 | ||
1073 | switch (TREE_CODE (type)) | |
1074 | { | |
1075 | case INTEGER_TYPE: | |
1076 | case BOOLEAN_TYPE: | |
97458258 MM |
1077 | case REAL_TYPE: |
1078 | case VOID_TYPE: | |
1e85e720 | 1079 | case NULLPTR_TYPE: |
848eed92 | 1080 | return true; |
c8094d83 | 1081 | |
5116acc6 | 1082 | case LANG_TYPE: |
1e85e720 | 1083 | /* fall through. */ |
5116acc6 | 1084 | |
97458258 | 1085 | default: |
848eed92 | 1086 | return false; |
97458258 MM |
1087 | } |
1088 | } | |
1089 | ||
1bf5fc34 NS |
1090 | /* Generate the initializer for the type info describing TYPE. TK_INDEX is |
1091 | the index of the descriptor in the tinfo_desc vector. */ | |
7267d692 NS |
1092 | |
1093 | static tree | |
1bf5fc34 | 1094 | get_pseudo_ti_init (tree type, unsigned tk_index) |
7267d692 | 1095 | { |
9771b263 | 1096 | tinfo_s *ti = &(*tinfo_descs)[tk_index]; |
3db45ab5 | 1097 | |
50bc768d | 1098 | gcc_assert (at_eof); |
1bf5fc34 | 1099 | switch (tk_index) |
7267d692 | 1100 | { |
1bf5fc34 NS |
1101 | case TK_POINTER_MEMBER_TYPE: |
1102 | return ptm_initializer (ti, type); | |
3db45ab5 | 1103 | |
1bf5fc34 NS |
1104 | case TK_POINTER_TYPE: |
1105 | return ptr_initializer (ti, type); | |
3db45ab5 | 1106 | |
1bf5fc34 NS |
1107 | case TK_BUILTIN_TYPE: |
1108 | case TK_ENUMERAL_TYPE: | |
1109 | case TK_FUNCTION_TYPE: | |
1110 | case TK_ARRAY_TYPE: | |
1111 | return generic_initializer (ti, type); | |
1112 | ||
1113 | case TK_CLASS_TYPE: | |
e20463aa | 1114 | return class_initializer (ti, type, 0); |
1bf5fc34 NS |
1115 | |
1116 | case TK_SI_CLASS_TYPE: | |
1117 | { | |
1118 | tree base_binfo = BINFO_BASE_BINFO (TYPE_BINFO (type), 0); | |
1119 | tree tinfo = get_tinfo_ptr (BINFO_TYPE (base_binfo)); | |
96d84476 JJ |
1120 | |
1121 | /* get_tinfo_ptr might have reallocated the tinfo_descs vector. */ | |
9771b263 | 1122 | ti = &(*tinfo_descs)[tk_index]; |
e20463aa | 1123 | return class_initializer (ti, type, 1, tinfo); |
1bf5fc34 | 1124 | } |
97458258 | 1125 | |
7267d692 | 1126 | default: |
1bf5fc34 NS |
1127 | { |
1128 | int hint = ((CLASSTYPE_REPEATED_BASE_P (type) << 0) | |
1129 | | (CLASSTYPE_DIAMOND_SHAPED_P (type) << 1)); | |
1130 | tree binfo = TYPE_BINFO (type); | |
1131 | int nbases = BINFO_N_BASE_BINFOS (binfo); | |
9771b263 | 1132 | vec<tree, va_gc> *base_accesses = BINFO_BASE_ACCESSES (binfo); |
1c773c7a | 1133 | tree offset_type = LONGPTR_T; |
1bf5fc34 NS |
1134 | tree base_inits = NULL_TREE; |
1135 | int ix; | |
9771b263 | 1136 | vec<constructor_elt, va_gc> *init_vec = NULL; |
e20463aa | 1137 | constructor_elt *e; |
3db45ab5 | 1138 | |
1bf5fc34 | 1139 | gcc_assert (tk_index >= TK_FIXED); |
3db45ab5 | 1140 | |
9771b263 | 1141 | vec_safe_grow (init_vec, nbases); |
1bf5fc34 NS |
1142 | /* Generate the base information initializer. */ |
1143 | for (ix = nbases; ix--;) | |
1144 | { | |
1145 | tree base_binfo = BINFO_BASE_BINFO (binfo, ix); | |
e20463aa | 1146 | tree base_init; |
1bf5fc34 NS |
1147 | int flags = 0; |
1148 | tree tinfo; | |
1149 | tree offset; | |
9771b263 | 1150 | vec<constructor_elt, va_gc> *v; |
3db45ab5 | 1151 | |
9771b263 | 1152 | if ((*base_accesses)[ix] == access_public_node) |
1bf5fc34 NS |
1153 | flags |= 2; |
1154 | tinfo = get_tinfo_ptr (BINFO_TYPE (base_binfo)); | |
1155 | if (BINFO_VIRTUAL_P (base_binfo)) | |
1156 | { | |
1157 | /* We store the vtable offset at which the virtual | |
3db45ab5 | 1158 | base offset can be found. */ |
1bf5fc34 | 1159 | offset = BINFO_VPTR_FIELD (base_binfo); |
1bf5fc34 NS |
1160 | flags |= 1; |
1161 | } | |
1162 | else | |
1163 | offset = BINFO_OFFSET (base_binfo); | |
3db45ab5 | 1164 | |
1bf5fc34 | 1165 | /* Combine offset and flags into one field. */ |
07b183fd | 1166 | offset = fold_convert (offset_type, offset); |
db3927fb AH |
1167 | offset = fold_build2_loc (input_location, |
1168 | LSHIFT_EXPR, offset_type, offset, | |
07b183fd | 1169 | build_int_cst (offset_type, 8)); |
db3927fb AH |
1170 | offset = fold_build2_loc (input_location, |
1171 | BIT_IOR_EXPR, offset_type, offset, | |
07b183fd | 1172 | build_int_cst (offset_type, flags)); |
9771b263 | 1173 | vec_alloc (v, 2); |
e20463aa NF |
1174 | CONSTRUCTOR_APPEND_ELT (v, NULL_TREE, tinfo); |
1175 | CONSTRUCTOR_APPEND_ELT (v, NULL_TREE, offset); | |
1176 | base_init = build_constructor (init_list_type_node, v); | |
9771b263 | 1177 | e = &(*init_vec)[ix]; |
e20463aa NF |
1178 | e->index = NULL_TREE; |
1179 | e->value = base_init; | |
1bf5fc34 | 1180 | } |
e20463aa | 1181 | base_inits = build_constructor (init_list_type_node, init_vec); |
96d84476 JJ |
1182 | |
1183 | /* get_tinfo_ptr might have reallocated the tinfo_descs vector. */ | |
9771b263 | 1184 | ti = &(*tinfo_descs)[tk_index]; |
e20463aa NF |
1185 | return class_initializer (ti, type, 3, |
1186 | build_int_cst (NULL_TREE, hint), | |
1187 | build_int_cst (NULL_TREE, nbases), | |
1188 | base_inits); | |
1bf5fc34 | 1189 | } |
7267d692 | 1190 | } |
7267d692 NS |
1191 | } |
1192 | ||
1193 | /* Generate the RECORD_TYPE containing the data layout of a type_info | |
1194 | derivative as used by the runtime. This layout must be consistent with | |
1195 | that defined in the runtime support. Also generate the VAR_DECL for the | |
1196 | type's vtable. We explicitly manage the vtable member, and name it for | |
1197 | real type as used in the runtime. The RECORD type has a different name, | |
1198 | to avoid collisions. Return a TREE_LIST who's TINFO_PSEUDO_TYPE | |
d689a8f1 NS |
1199 | is the generated type and TINFO_VTABLE_NAME is the name of the |
1200 | vtable. We have to delay generating the VAR_DECL of the vtable | |
1201 | until the end of the translation, when we'll have seen the library | |
1202 | definition, if there was one. | |
c8094d83 | 1203 | |
7267d692 NS |
1204 | REAL_NAME is the runtime's name of the type. Trailing arguments are |
1205 | additional FIELD_DECL's for the structure. The final argument must be | |
1206 | NULL. */ | |
1207 | ||
1bf5fc34 | 1208 | static void |
fe93f42f | 1209 | create_pseudo_type_info (int tk, const char *real_name, ...) |
7267d692 | 1210 | { |
1bf5fc34 | 1211 | tinfo_s *ti; |
d689a8f1 | 1212 | tree pseudo_type; |
7267d692 | 1213 | char *pseudo_name; |
4977bab6 | 1214 | tree fields; |
7267d692 | 1215 | tree field_decl; |
e34d07f2 | 1216 | va_list ap; |
7a75edb7 | 1217 | |
1bf5fc34 | 1218 | va_start (ap, real_name); |
7267d692 | 1219 | |
c6002625 | 1220 | /* Generate the pseudo type name. */ |
67f5655f | 1221 | pseudo_name = (char *) alloca (strlen (real_name) + 30); |
7267d692 NS |
1222 | strcpy (pseudo_name, real_name); |
1223 | strcat (pseudo_name, "_pseudo"); | |
1bf5fc34 NS |
1224 | if (tk >= TK_FIXED) |
1225 | sprintf (pseudo_name + strlen (pseudo_name), "%d", tk - TK_FIXED); | |
c8094d83 | 1226 | |
c6002625 | 1227 | /* First field is the pseudo type_info base class. */ |
c2255bc4 AH |
1228 | fields = build_decl (input_location, |
1229 | FIELD_DECL, NULL_TREE, | |
9771b263 | 1230 | (*tinfo_descs)[TK_TYPE_INFO_TYPE].type); |
c8094d83 | 1231 | |
7267d692 | 1232 | /* Now add the derived fields. */ |
4977bab6 ZW |
1233 | while ((field_decl = va_arg (ap, tree))) |
1234 | { | |
910ad8de | 1235 | DECL_CHAIN (field_decl) = fields; |
4977bab6 ZW |
1236 | fields = field_decl; |
1237 | } | |
c8094d83 | 1238 | |
c6002625 | 1239 | /* Create the pseudo type. */ |
9e1e64ec | 1240 | pseudo_type = make_class_type (RECORD_TYPE); |
4977bab6 | 1241 | finish_builtin_struct (pseudo_type, pseudo_name, fields, NULL_TREE); |
8e3df2de | 1242 | CLASSTYPE_AS_BASE (pseudo_type) = pseudo_type; |
7a75edb7 | 1243 | |
9771b263 | 1244 | ti = &(*tinfo_descs)[tk]; |
1bf5fc34 NS |
1245 | ti->type = cp_build_qualified_type (pseudo_type, TYPE_QUAL_CONST); |
1246 | ti->name = get_identifier (real_name); | |
1247 | ti->vtable = NULL_TREE; | |
c8094d83 | 1248 | |
b9e75696 JM |
1249 | /* Pretend this is public so determine_visibility doesn't give vtables |
1250 | internal linkage. */ | |
1251 | TREE_PUBLIC (TYPE_MAIN_DECL (ti->type)) = 1; | |
1252 | ||
e34d07f2 | 1253 | va_end (ap); |
7267d692 NS |
1254 | } |
1255 | ||
1bf5fc34 NS |
1256 | /* Return the index of a pseudo type info type node used to describe |
1257 | TYPE. TYPE must be a complete type (or cv void), except at the end | |
1258 | of the translation unit. */ | |
7267d692 | 1259 | |
1bf5fc34 NS |
1260 | static unsigned |
1261 | get_pseudo_ti_index (tree type) | |
7267d692 | 1262 | { |
1bf5fc34 | 1263 | unsigned ix; |
3db45ab5 | 1264 | |
d689a8f1 | 1265 | switch (TREE_CODE (type)) |
7267d692 | 1266 | { |
a5ac359a | 1267 | case OFFSET_TYPE: |
1bf5fc34 NS |
1268 | ix = TK_POINTER_MEMBER_TYPE; |
1269 | break; | |
3db45ab5 | 1270 | |
d689a8f1 | 1271 | case POINTER_TYPE: |
1bf5fc34 NS |
1272 | ix = TK_POINTER_TYPE; |
1273 | break; | |
3db45ab5 | 1274 | |
d689a8f1 | 1275 | case ENUMERAL_TYPE: |
1bf5fc34 NS |
1276 | ix = TK_ENUMERAL_TYPE; |
1277 | break; | |
3db45ab5 | 1278 | |
d689a8f1 | 1279 | case FUNCTION_TYPE: |
1bf5fc34 NS |
1280 | ix = TK_FUNCTION_TYPE; |
1281 | break; | |
3db45ab5 | 1282 | |
d689a8f1 | 1283 | case ARRAY_TYPE: |
1bf5fc34 NS |
1284 | ix = TK_ARRAY_TYPE; |
1285 | break; | |
3db45ab5 | 1286 | |
d689a8f1 NS |
1287 | case UNION_TYPE: |
1288 | case RECORD_TYPE: | |
1289 | if (TYPE_PTRMEMFUNC_P (type)) | |
1bf5fc34 NS |
1290 | { |
1291 | ix = TK_POINTER_MEMBER_TYPE; | |
1292 | break; | |
1293 | } | |
d689a8f1 NS |
1294 | else if (!COMPLETE_TYPE_P (type)) |
1295 | { | |
5aa3396c JM |
1296 | if (!at_eof) |
1297 | cxx_incomplete_type_error (NULL_TREE, type); | |
1bf5fc34 NS |
1298 | ix = TK_CLASS_TYPE; |
1299 | break; | |
d689a8f1 | 1300 | } |
604a3205 | 1301 | else if (!BINFO_N_BASE_BINFOS (TYPE_BINFO (type))) |
1bf5fc34 NS |
1302 | { |
1303 | ix = TK_CLASS_TYPE; | |
1304 | break; | |
1305 | } | |
d689a8f1 NS |
1306 | else |
1307 | { | |
dbbf88d1 | 1308 | tree binfo = TYPE_BINFO (type); |
9771b263 | 1309 | vec<tree, va_gc> *base_accesses = BINFO_BASE_ACCESSES (binfo); |
fa743e8c NS |
1310 | tree base_binfo = BINFO_BASE_BINFO (binfo, 0); |
1311 | int num_bases = BINFO_N_BASE_BINFOS (binfo); | |
c8094d83 | 1312 | |
d689a8f1 | 1313 | if (num_bases == 1 |
9771b263 | 1314 | && (*base_accesses)[0] == access_public_node |
809e3e7f | 1315 | && !BINFO_VIRTUAL_P (base_binfo) |
d689a8f1 | 1316 | && integer_zerop (BINFO_OFFSET (base_binfo))) |
1bf5fc34 NS |
1317 | { |
1318 | /* single non-virtual public. */ | |
1319 | ix = TK_SI_CLASS_TYPE; | |
1320 | break; | |
1321 | } | |
d689a8f1 NS |
1322 | else |
1323 | { | |
1bf5fc34 | 1324 | tinfo_s *ti; |
d689a8f1 | 1325 | tree array_domain, base_array; |
c8094d83 | 1326 | |
1bf5fc34 | 1327 | ix = TK_FIXED + num_bases; |
9771b263 | 1328 | if (vec_safe_length (tinfo_descs) <= ix) |
d689a8f1 | 1329 | { |
1bf5fc34 | 1330 | /* too short, extend. */ |
9771b263 | 1331 | unsigned len = vec_safe_length (tinfo_descs); |
3db45ab5 | 1332 | |
9771b263 DN |
1333 | vec_safe_grow (tinfo_descs, ix + 1); |
1334 | while (tinfo_descs->iterate (len++, &ti)) | |
1bf5fc34 | 1335 | ti->type = ti->vtable = ti->name = NULL_TREE; |
d689a8f1 | 1336 | } |
9771b263 | 1337 | else if ((*tinfo_descs)[ix].type) |
1bf5fc34 NS |
1338 | /* already created. */ |
1339 | break; | |
c8094d83 | 1340 | |
90d84934 JM |
1341 | /* Create the array of __base_class_type_info entries. */ |
1342 | array_domain = build_index_type (size_int (num_bases - 1)); | |
9771b263 DN |
1343 | base_array = build_array_type ((*tinfo_descs)[TK_BASE_TYPE].type, |
1344 | array_domain); | |
d689a8f1 | 1345 | |
a15f0fd0 | 1346 | push_abi_namespace (); |
1bf5fc34 NS |
1347 | create_pseudo_type_info |
1348 | (ix, "__vmi_class_type_info", | |
c2255bc4 AH |
1349 | build_decl (input_location, |
1350 | FIELD_DECL, NULL_TREE, integer_type_node), | |
1351 | build_decl (input_location, | |
1352 | FIELD_DECL, NULL_TREE, integer_type_node), | |
1353 | build_decl (input_location, | |
1354 | FIELD_DECL, NULL_TREE, base_array), | |
d689a8f1 | 1355 | NULL); |
a15f0fd0 | 1356 | pop_abi_namespace (); |
1bf5fc34 | 1357 | break; |
d689a8f1 NS |
1358 | } |
1359 | } | |
1360 | default: | |
1bf5fc34 NS |
1361 | ix = TK_BUILTIN_TYPE; |
1362 | break; | |
d689a8f1 | 1363 | } |
1bf5fc34 | 1364 | return ix; |
7267d692 NS |
1365 | } |
1366 | ||
1367 | /* Make sure the required builtin types exist for generating the type_info | |
a692ad2e | 1368 | variable definitions. */ |
7267d692 NS |
1369 | |
1370 | static void | |
848eed92 | 1371 | create_tinfo_types (void) |
7267d692 | 1372 | { |
1bf5fc34 | 1373 | tinfo_s *ti; |
3db45ab5 | 1374 | |
1bf5fc34 | 1375 | gcc_assert (!tinfo_descs); |
7267d692 | 1376 | |
9771b263 | 1377 | vec_safe_grow (tinfo_descs, TK_FIXED); |
3db45ab5 | 1378 | |
a15f0fd0 | 1379 | push_abi_namespace (); |
c8094d83 | 1380 | |
7267d692 NS |
1381 | /* Create the internal type_info structure. This is used as a base for |
1382 | the other structures. */ | |
1383 | { | |
4977bab6 | 1384 | tree field, fields; |
7267d692 | 1385 | |
c2255bc4 AH |
1386 | field = build_decl (BUILTINS_LOCATION, |
1387 | FIELD_DECL, NULL_TREE, const_ptr_type_node); | |
4977bab6 | 1388 | fields = field; |
c8094d83 | 1389 | |
c2255bc4 AH |
1390 | field = build_decl (BUILTINS_LOCATION, |
1391 | FIELD_DECL, NULL_TREE, const_string_type_node); | |
910ad8de | 1392 | DECL_CHAIN (field) = fields; |
4977bab6 | 1393 | fields = field; |
c8094d83 | 1394 | |
9771b263 | 1395 | ti = &(*tinfo_descs)[TK_TYPE_INFO_TYPE]; |
9e1e64ec | 1396 | ti->type = make_class_type (RECORD_TYPE); |
1bf5fc34 NS |
1397 | ti->vtable = NULL_TREE; |
1398 | ti->name = NULL_TREE; | |
1399 | finish_builtin_struct (ti->type, "__type_info_pseudo", | |
4977bab6 | 1400 | fields, NULL_TREE); |
7267d692 | 1401 | } |
c8094d83 | 1402 | |
7267d692 | 1403 | /* Fundamental type_info */ |
1bf5fc34 | 1404 | create_pseudo_type_info (TK_BUILTIN_TYPE, "__fundamental_type_info", NULL); |
7267d692 | 1405 | |
c6002625 | 1406 | /* Array, function and enum type_info. No additional fields. */ |
1bf5fc34 NS |
1407 | create_pseudo_type_info (TK_ARRAY_TYPE, "__array_type_info", NULL); |
1408 | create_pseudo_type_info (TK_FUNCTION_TYPE, "__function_type_info", NULL); | |
1409 | create_pseudo_type_info (TK_ENUMERAL_TYPE, "__enum_type_info", NULL); | |
3db45ab5 | 1410 | |
1bf5fc34 NS |
1411 | /* Class type_info. No additional fields. */ |
1412 | create_pseudo_type_info (TK_CLASS_TYPE, "__class_type_info", NULL); | |
3db45ab5 MS |
1413 | |
1414 | /* Single public non-virtual base class. Add pointer to base class. | |
6d61f400 | 1415 | This is really a descendant of __class_type_info. */ |
1bf5fc34 | 1416 | create_pseudo_type_info (TK_SI_CLASS_TYPE, "__si_class_type_info", |
c2255bc4 AH |
1417 | build_decl (BUILTINS_LOCATION, |
1418 | FIELD_DECL, NULL_TREE, type_info_ptr_type), | |
3db45ab5 | 1419 | NULL); |
c8094d83 | 1420 | |
7267d692 | 1421 | /* Base class internal helper. Pointer to base type, offset to base, |
c6002625 | 1422 | flags. */ |
7267d692 | 1423 | { |
4977bab6 | 1424 | tree field, fields; |
c8094d83 | 1425 | |
c2255bc4 AH |
1426 | field = build_decl (BUILTINS_LOCATION, |
1427 | FIELD_DECL, NULL_TREE, type_info_ptr_type); | |
4977bab6 | 1428 | fields = field; |
c8094d83 | 1429 | |
c2255bc4 | 1430 | field = build_decl (BUILTINS_LOCATION, |
1c773c7a | 1431 | FIELD_DECL, NULL_TREE, LONGPTR_T); |
910ad8de | 1432 | DECL_CHAIN (field) = fields; |
4977bab6 | 1433 | fields = field; |
3db45ab5 | 1434 | |
9771b263 | 1435 | ti = &(*tinfo_descs)[TK_BASE_TYPE]; |
3db45ab5 | 1436 | |
9e1e64ec | 1437 | ti->type = make_class_type (RECORD_TYPE); |
1bf5fc34 NS |
1438 | ti->vtable = NULL_TREE; |
1439 | ti->name = NULL_TREE; | |
1440 | finish_builtin_struct (ti->type, "__base_class_type_info_pseudo", | |
4977bab6 | 1441 | fields, NULL_TREE); |
7267d692 | 1442 | } |
c8094d83 | 1443 | |
387769ed NS |
1444 | /* Pointer type_info. Adds two fields, qualification mask |
1445 | and pointer to the pointed to type. This is really a descendant of | |
c6002625 | 1446 | __pbase_type_info. */ |
1bf5fc34 | 1447 | create_pseudo_type_info (TK_POINTER_TYPE, "__pointer_type_info", |
c2255bc4 AH |
1448 | build_decl (BUILTINS_LOCATION, |
1449 | FIELD_DECL, NULL_TREE, integer_type_node), | |
1450 | build_decl (BUILTINS_LOCATION, | |
1451 | FIELD_DECL, NULL_TREE, type_info_ptr_type), | |
387769ed NS |
1452 | NULL); |
1453 | ||
6d61f400 NS |
1454 | /* Pointer to member data type_info. Add qualifications flags, |
1455 | pointer to the member's type info and pointer to the class. | |
387769ed | 1456 | This is really a descendant of __pbase_type_info. */ |
1bf5fc34 NS |
1457 | create_pseudo_type_info (TK_POINTER_MEMBER_TYPE, |
1458 | "__pointer_to_member_type_info", | |
c2255bc4 AH |
1459 | build_decl (BUILTINS_LOCATION, |
1460 | FIELD_DECL, NULL_TREE, integer_type_node), | |
1461 | build_decl (BUILTINS_LOCATION, | |
1462 | FIELD_DECL, NULL_TREE, type_info_ptr_type), | |
1463 | build_decl (BUILTINS_LOCATION, | |
1464 | FIELD_DECL, NULL_TREE, type_info_ptr_type), | |
3db45ab5 | 1465 | NULL); |
7267d692 | 1466 | |
a15f0fd0 | 1467 | pop_abi_namespace (); |
7267d692 NS |
1468 | } |
1469 | ||
793c625f MG |
1470 | /* Helper for emit_support_tinfos. Emits the type_info descriptor of |
1471 | a single type. */ | |
1472 | ||
1473 | void | |
1474 | emit_support_tinfo_1 (tree bltn) | |
1475 | { | |
1476 | tree types[3]; | |
1477 | ||
1478 | if (bltn == NULL_TREE) | |
1479 | return; | |
1480 | types[0] = bltn; | |
1481 | types[1] = build_pointer_type (bltn); | |
1482 | types[2] = build_pointer_type (cp_build_qualified_type (bltn, | |
1483 | TYPE_QUAL_CONST)); | |
1484 | ||
1485 | for (int i = 0; i < 3; ++i) | |
1486 | { | |
1487 | tree tinfo = get_tinfo_decl (types[i]); | |
1488 | TREE_USED (tinfo) = 1; | |
1489 | mark_needed (tinfo); | |
1490 | /* The C++ ABI requires that these objects be COMDAT. But, | |
1491 | On systems without weak symbols, initialized COMDAT | |
1492 | objects are emitted with internal linkage. (See | |
1493 | comdat_linkage for details.) Since we want these objects | |
1494 | to have external linkage so that copies do not have to be | |
1495 | emitted in code outside the runtime library, we make them | |
1496 | non-COMDAT here. | |
1497 | ||
1498 | It might also not be necessary to follow this detail of the | |
1499 | ABI. */ | |
1500 | if (!flag_weak || ! targetm.cxx.library_rtti_comdat ()) | |
1501 | { | |
1502 | gcc_assert (TREE_PUBLIC (tinfo) && !DECL_COMDAT (tinfo)); | |
1503 | DECL_INTERFACE_KNOWN (tinfo) = 1; | |
1504 | } | |
1505 | } | |
1506 | } | |
1507 | ||
7267d692 NS |
1508 | /* Emit the type_info descriptors which are guaranteed to be in the runtime |
1509 | support. Generating them here guarantees consistency with the other | |
1510 | structures. We use the following heuristic to determine when the runtime | |
7f54a851 | 1511 | is being generated. If std::__fundamental_type_info is defined, and its |
7267d692 NS |
1512 | destructor is defined, then the runtime is being built. */ |
1513 | ||
1514 | void | |
848eed92 | 1515 | emit_support_tinfos (void) |
7267d692 | 1516 | { |
14c2101d JM |
1517 | /* Dummy static variable so we can put nullptr in the array; it will be |
1518 | set before we actually start to walk the array. */ | |
7267d692 NS |
1519 | static tree *const fundamentals[] = |
1520 | { | |
1521 | &void_type_node, | |
1522 | &boolean_type_node, | |
c466b2cd | 1523 | &wchar_type_node, &char16_type_node, &char32_type_node, |
7267d692 NS |
1524 | &char_type_node, &signed_char_type_node, &unsigned_char_type_node, |
1525 | &short_integer_type_node, &short_unsigned_type_node, | |
1526 | &integer_type_node, &unsigned_type_node, | |
1527 | &long_integer_type_node, &long_unsigned_type_node, | |
1528 | &long_long_integer_type_node, &long_long_unsigned_type_node, | |
1529 | &float_type_node, &double_type_node, &long_double_type_node, | |
fae927d3 | 1530 | &dfloat32_type_node, &dfloat64_type_node, &dfloat128_type_node, |
14c2101d | 1531 | &nullptr_type_node, |
7267d692 NS |
1532 | 0 |
1533 | }; | |
1534 | int ix; | |
1535 | tree bltn_type, dtor; | |
c8094d83 | 1536 | |
a15f0fd0 | 1537 | push_abi_namespace (); |
88e5899c | 1538 | bltn_type = xref_tag (class_type, |
c8094d83 | 1539 | get_identifier ("__fundamental_type_info"), |
bd3d082e | 1540 | /*tag_scope=*/ts_current, false); |
a15f0fd0 | 1541 | pop_abi_namespace (); |
d0f062fb | 1542 | if (!COMPLETE_TYPE_P (bltn_type)) |
7267d692 | 1543 | return; |
aaaa46d2 | 1544 | dtor = CLASSTYPE_DESTRUCTORS (bltn_type); |
9f4faeae | 1545 | if (!dtor || DECL_EXTERNAL (dtor)) |
7267d692 NS |
1546 | return; |
1547 | doing_runtime = 1; | |
1548 | for (ix = 0; fundamentals[ix]; ix++) | |
793c625f | 1549 | emit_support_tinfo_1 (*fundamentals[ix]); |
78a7c317 DD |
1550 | for (ix = 0; ix < NUM_INT_N_ENTS; ix ++) |
1551 | if (int_n_enabled_p[ix]) | |
1552 | { | |
1553 | emit_support_tinfo_1 (int_n_trees[ix].signed_type); | |
1554 | emit_support_tinfo_1 (int_n_trees[ix].unsigned_type); | |
1555 | } | |
bb59f396 MG |
1556 | for (tree t = registered_builtin_types; t; t = TREE_CHAIN (t)) |
1557 | emit_support_tinfo_1 (TREE_VALUE (t)); | |
7267d692 NS |
1558 | } |
1559 | ||
d689a8f1 NS |
1560 | /* Finish a type info decl. DECL_PTR is a pointer to an unemitted |
1561 | tinfo decl. Determine whether it needs emitting, and if so | |
1562 | generate the initializer. */ | |
7267d692 | 1563 | |
848eed92 | 1564 | bool |
a260bce6 | 1565 | emit_tinfo_decl (tree decl) |
7267d692 | 1566 | { |
d689a8f1 | 1567 | tree type = TREE_TYPE (DECL_NAME (decl)); |
c6f553d1 | 1568 | int in_library = typeinfo_in_lib_p (type); |
a260bce6 | 1569 | |
c8094d83 MS |
1570 | gcc_assert (DECL_TINFO_P (decl)); |
1571 | ||
4684cd27 MM |
1572 | if (in_library) |
1573 | { | |
1574 | if (doing_runtime) | |
1575 | DECL_EXTERNAL (decl) = 0; | |
1576 | else | |
1577 | { | |
1578 | /* If we're not in the runtime, then DECL (which is already | |
1579 | DECL_EXTERNAL) will not be defined here. */ | |
1580 | DECL_INTERFACE_KNOWN (decl) = 1; | |
1581 | return false; | |
1582 | } | |
1583 | } | |
1584 | else if (involves_incomplete_p (type)) | |
1585 | { | |
1586 | if (!decl_needed_p (decl)) | |
1587 | return false; | |
1588 | /* If TYPE involves an incomplete class type, then the typeinfo | |
1589 | object will be emitted with internal linkage. There is no | |
1590 | way to know whether or not types are incomplete until the end | |
1591 | of the compilation, so this determination must be deferred | |
1592 | until this point. */ | |
1593 | TREE_PUBLIC (decl) = 0; | |
1594 | DECL_EXTERNAL (decl) = 0; | |
1595 | DECL_INTERFACE_KNOWN (decl) = 1; | |
1596 | } | |
ff48be5c | 1597 | |
4684cd27 MM |
1598 | import_export_decl (decl); |
1599 | if (DECL_NOT_REALLY_EXTERN (decl) && decl_needed_p (decl)) | |
1600 | { | |
1bf5fc34 | 1601 | tree init; |
3db45ab5 | 1602 | |
4684cd27 | 1603 | DECL_EXTERNAL (decl) = 0; |
1bf5fc34 NS |
1604 | init = get_pseudo_ti_init (type, get_pseudo_ti_index (type)); |
1605 | DECL_INITIAL (decl) = init; | |
4684cd27 | 1606 | mark_used (decl); |
3600f678 | 1607 | cp_finish_decl (decl, init, false, NULL_TREE, 0); |
c517fc92 JH |
1608 | /* Avoid targets optionally bumping up the alignment to improve |
1609 | vector instruction accesses, tinfo are never accessed this way. */ | |
1610 | #ifdef DATA_ABI_ALIGNMENT | |
1611 | DECL_ALIGN (decl) = DATA_ABI_ALIGNMENT (decl, TYPE_ALIGN (TREE_TYPE (decl))); | |
1612 | DECL_USER_ALIGN (decl) = true; | |
1613 | #endif | |
4684cd27 MM |
1614 | return true; |
1615 | } | |
1616 | else | |
848eed92 | 1617 | return false; |
7267d692 | 1618 | } |
1bf5fc34 NS |
1619 | |
1620 | #include "gt-cp-rtti.h" |