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84a43794 | 1 | /* RunTime Type Identification |
23a5b65a | 2 | Copyright (C) 1995-2014 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" | |
84a43794 | 26 | #include "tree.h" |
d8a2d370 DN |
27 | #include "stringpool.h" |
28 | #include "stor-layout.h" | |
84a43794 MS |
29 | #include "cp-tree.h" |
30 | #include "flags.h" | |
7b6d72fc | 31 | #include "convert.h" |
157600d0 | 32 | #include "target.h" |
39dabefd | 33 | #include "c-family/c-pragma.h" |
5156628f | 34 | |
d689a8f1 NS |
35 | /* C++ returns type information to the user in struct type_info |
36 | objects. We also use type information to implement dynamic_cast and | |
37 | exception handlers. Type information for a particular type is | |
38 | indicated with an ABI defined structure derived from type_info. | |
39 | This would all be very straight forward, but for the fact that the | |
40 | runtime library provides the definitions of the type_info structure | |
41 | and the ABI defined derived classes. We cannot build declarations | |
42 | of them directly in the compiler, but we need to layout objects of | |
43 | their type. Somewhere we have to lie. | |
44 | ||
45 | We define layout compatible POD-structs with compiler-defined names | |
46 | and generate the appropriate initializations for them (complete | |
47 | with explicit mention of their vtable). When we have to provide a | |
48 | type_info to the user we reinterpret_cast the internal compiler | |
49 | type to type_info. A well formed program can only explicitly refer | |
50 | to the type_infos of complete types (& cv void). However, we chain | |
51 | pointer type_infos to the pointed-to-type, and that can be | |
52 | incomplete. We only need the addresses of such incomplete | |
53 | type_info objects for static initialization. | |
54 | ||
55 | The type information VAR_DECL of a type is held on the | |
56 | IDENTIFIER_GLOBAL_VALUE of the type's mangled name. That VAR_DECL | |
57 | will be the internal type. It will usually have the correct | |
58 | internal type reflecting the kind of type it represents (pointer, | |
59 | array, function, class, inherited class, etc). When the type it | |
60 | represents is incomplete, it will have the internal type | |
61 | corresponding to type_info. That will only happen at the end of | |
62 | translation, when we are emitting the type info objects. */ | |
63 | ||
1bf5fc34 | 64 | /* Auxiliary data we hold for each type_info derived object we need. */ |
d1b38208 | 65 | typedef struct GTY (()) tinfo_s { |
1bf5fc34 NS |
66 | tree type; /* The RECORD_TYPE for this type_info object */ |
67 | ||
68 | tree vtable; /* The VAR_DECL of the vtable. Only filled at end of | |
69 | translation. */ | |
70 | ||
71 | tree name; /* IDENTIFIER_NODE for the ABI specified name of | |
72 | the type_info derived type. */ | |
73 | } tinfo_s; | |
74 | ||
1bf5fc34 NS |
75 | |
76 | typedef enum tinfo_kind | |
77 | { | |
3a44f395 | 78 | TK_TYPE_INFO_TYPE, /* abi::__type_info_pseudo */ |
1bf5fc34 NS |
79 | TK_BASE_TYPE, /* abi::__base_class_type_info */ |
80 | TK_BUILTIN_TYPE, /* 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 */ | |
3db45ab5 MS |
88 | TK_FIXED /* end of fixed descriptors. */ |
89 | /* ... abi::__vmi_type_info<I> */ | |
1bf5fc34 | 90 | } tinfo_kind; |
84a43794 | 91 | |
1c773c7a KT |
92 | /* Helper macro to get maximum scalar-width of pointer or of the 'long'-type. |
93 | This of interest for llp64 targets. */ | |
94 | #define LONGPTR_T \ | |
95 | integer_types[(POINTER_SIZE <= TYPE_PRECISION (integer_types[itk_long]) \ | |
96 | ? itk_long : itk_long_long)] | |
97 | ||
94214953 | 98 | /* A vector of all tinfo decls that haven't yet been emitted. */ |
9771b263 | 99 | vec<tree, va_gc> *unemitted_tinfo_decls; |
a260bce6 | 100 | |
1bf5fc34 NS |
101 | /* A vector of all type_info derived types we need. The first few are |
102 | fixed and created early. The remainder are for multiple inheritance | |
103 | and are generated as needed. */ | |
9771b263 | 104 | static GTY (()) vec<tinfo_s, va_gc> *tinfo_descs; |
1bf5fc34 | 105 | |
4b978f96 | 106 | static tree ifnonnull (tree, tree, tsubst_flags_t); |
52669d59 | 107 | static tree tinfo_name (tree, bool); |
5ade1ed2 | 108 | static tree build_dynamic_cast_1 (tree, tree, tsubst_flags_t); |
cec57f72 NN |
109 | static tree throw_bad_cast (void); |
110 | static tree throw_bad_typeid (void); | |
cec57f72 NN |
111 | static tree get_tinfo_ptr (tree); |
112 | static bool typeid_ok_p (void); | |
113 | static int qualifier_flags (tree); | |
848eed92 | 114 | static bool target_incomplete_p (tree); |
1bf5fc34 NS |
115 | static tree tinfo_base_init (tinfo_s *, tree); |
116 | static tree generic_initializer (tinfo_s *, tree); | |
117 | static tree ptr_initializer (tinfo_s *, tree); | |
118 | static tree ptm_initializer (tinfo_s *, tree); | |
e20463aa | 119 | static tree class_initializer (tinfo_s *, tree, unsigned, ...); |
fe93f42f | 120 | static void create_pseudo_type_info (int, const char *, ...); |
1bf5fc34 NS |
121 | static tree get_pseudo_ti_init (tree, unsigned); |
122 | static unsigned get_pseudo_ti_index (tree); | |
cec57f72 | 123 | static void create_tinfo_types (void); |
848eed92 | 124 | static bool typeinfo_in_lib_p (tree); |
7267d692 NS |
125 | |
126 | static int doing_runtime = 0; | |
84a43794 | 127 | \f |
a15f0fd0 JJ |
128 | static void |
129 | push_abi_namespace (void) | |
130 | { | |
131 | push_nested_namespace (abi_node); | |
9789ba46 | 132 | push_visibility ("default", 2); |
a15f0fd0 JJ |
133 | } |
134 | ||
135 | static void | |
136 | pop_abi_namespace (void) | |
137 | { | |
9789ba46 | 138 | pop_visibility (2); |
a15f0fd0 JJ |
139 | pop_nested_namespace (abi_node); |
140 | } | |
d689a8f1 NS |
141 | |
142 | /* Declare language defined type_info type and a pointer to const | |
143 | type_info. This is incomplete here, and will be completed when | |
144 | the user #includes <typeinfo>. There are language defined | |
145 | restrictions on what can be done until that is included. Create | |
146 | the internal versions of the ABI types. */ | |
147 | ||
6b5fbb55 | 148 | void |
848eed92 | 149 | init_rtti_processing (void) |
6b5fbb55 | 150 | { |
db24eb1f | 151 | tree type_info_type; |
c8094d83 | 152 | |
1dbb6023 | 153 | push_namespace (std_identifier); |
db24eb1f | 154 | type_info_type = xref_tag (class_type, get_identifier ("type_info"), |
bd3d082e | 155 | /*tag_scope=*/ts_current, false); |
1dbb6023 | 156 | pop_namespace (); |
db24eb1f | 157 | const_type_info_type_node |
a3360e77 | 158 | = cp_build_qualified_type (type_info_type, TYPE_QUAL_CONST); |
db24eb1f | 159 | type_info_ptr_type = build_pointer_type (const_type_info_type_node); |
d689a8f1 | 160 | |
9771b263 | 161 | vec_alloc (unemitted_tinfo_decls, 124); |
c8094d83 | 162 | |
d689a8f1 | 163 | create_tinfo_types (); |
6b5fbb55 MS |
164 | } |
165 | ||
6b5fbb55 MS |
166 | /* Given the expression EXP of type `class *', return the head of the |
167 | object pointed to by EXP with type cv void*, if the class has any | |
4c6b7393 | 168 | virtual functions (TYPE_POLYMORPHIC_P), else just return the |
6b5fbb55 | 169 | expression. */ |
e92cc029 | 170 | |
6f06d231 | 171 | tree |
848eed92 | 172 | build_headof (tree exp) |
84a43794 MS |
173 | { |
174 | tree type = TREE_TYPE (exp); | |
de22184b | 175 | tree offset; |
da3d4dfa | 176 | tree index; |
84a43794 | 177 | |
50e10fa8 | 178 | gcc_assert (TYPE_PTR_P (type)); |
84a43794 MS |
179 | type = TREE_TYPE (type); |
180 | ||
4c6b7393 | 181 | if (!TYPE_POLYMORPHIC_P (type)) |
84a43794 MS |
182 | return exp; |
183 | ||
6b5fbb55 MS |
184 | /* We use this a couple of times below, protect it. */ |
185 | exp = save_expr (exp); | |
186 | ||
3461fba7 | 187 | /* The offset-to-top field is at index -2 from the vptr. */ |
4a90aeeb | 188 | index = build_int_cst (NULL_TREE, |
7d60be94 | 189 | -2 * TARGET_VTABLE_DATA_ENTRY_DISTANCE); |
da3d4dfa | 190 | |
dd865ef6 | 191 | offset = build_vtbl_ref (cp_build_indirect_ref (exp, RO_NULL, |
5ade1ed2 DG |
192 | tf_warning_or_error), |
193 | index); | |
84a43794 | 194 | |
a3360e77 JM |
195 | type = cp_build_qualified_type (ptr_type_node, |
196 | cp_type_quals (TREE_TYPE (exp))); | |
5d49b6a7 | 197 | return fold_build_pointer_plus (exp, offset); |
84a43794 | 198 | } |
5156628f | 199 | |
5156628f MS |
200 | /* Get a bad_cast node for the program to throw... |
201 | ||
202 | See libstdc++/exception.cc for __throw_bad_cast */ | |
203 | ||
204 | static tree | |
848eed92 | 205 | throw_bad_cast (void) |
5156628f | 206 | { |
1f84ec23 | 207 | tree fn = get_identifier ("__cxa_bad_cast"); |
c003e212 | 208 | if (!get_global_value_if_present (fn, &fn)) |
0244e6f7 NF |
209 | fn = push_throw_library_fn (fn, build_function_type_list (ptr_type_node, |
210 | NULL_TREE)); | |
c8094d83 | 211 | |
e2e03032 | 212 | return build_cxx_call (fn, 0, NULL, tf_warning_or_error); |
5156628f MS |
213 | } |
214 | ||
2050a1bb MM |
215 | /* Return an expression for "__cxa_bad_typeid()". The expression |
216 | returned is an lvalue of type "const std::type_info". */ | |
217 | ||
5156628f | 218 | static tree |
848eed92 | 219 | throw_bad_typeid (void) |
5156628f | 220 | { |
1f84ec23 | 221 | tree fn = get_identifier ("__cxa_bad_typeid"); |
c003e212 | 222 | if (!get_global_value_if_present (fn, &fn)) |
cf74fb86 | 223 | { |
db24eb1f NS |
224 | tree t; |
225 | ||
226 | t = build_reference_type (const_type_info_type_node); | |
0244e6f7 | 227 | t = build_function_type_list (t, NULL_TREE); |
cf74fb86 JM |
228 | fn = push_throw_library_fn (fn, t); |
229 | } | |
059fa5e7 | 230 | |
e2e03032 | 231 | return build_cxx_call (fn, 0, NULL, tf_warning_or_error); |
5156628f | 232 | } |
84a43794 | 233 | \f |
2050a1bb MM |
234 | /* Return an lvalue expression whose type is "const std::type_info" |
235 | and whose value indicates the type of the expression EXP. If EXP | |
236 | is a reference to a polymorphic class, return the dynamic type; | |
5156628f | 237 | otherwise return the static type of the expression. */ |
e92cc029 | 238 | |
e5f614d7 | 239 | static tree |
795801d6 | 240 | get_tinfo_decl_dynamic (tree exp, tsubst_flags_t complain) |
84a43794 MS |
241 | { |
242 | tree type; | |
2050a1bb | 243 | tree t; |
c8094d83 | 244 | |
717f8053 | 245 | if (error_operand_p (exp)) |
84a43794 MS |
246 | return error_mark_node; |
247 | ||
6780e186 JM |
248 | exp = resolve_nondeduced_context (exp); |
249 | ||
e92cc029 | 250 | /* peel back references, so they match. */ |
ee76b931 | 251 | type = non_reference (TREE_TYPE (exp)); |
84a43794 | 252 | |
e92cc029 | 253 | /* Peel off cv qualifiers. */ |
84a43794 | 254 | type = TYPE_MAIN_VARIANT (type); |
c8094d83 | 255 | |
41b059f3 | 256 | /* For UNKNOWN_TYPEs call complete_type_or_else to get diagnostics. */ |
fbfc8363 JM |
257 | if (CLASS_TYPE_P (type) || type == unknown_type_node |
258 | || type == init_list_type_node) | |
795801d6 | 259 | type = complete_type_or_maybe_complain (type, exp, complain); |
c8094d83 | 260 | |
e5f614d7 NS |
261 | if (!type) |
262 | return error_mark_node; | |
6a8f78d5 | 263 | |
84a43794 | 264 | /* If exp is a reference to polymorphic type, get the real type_info. */ |
4c6b7393 | 265 | if (TYPE_POLYMORPHIC_P (type) && ! resolves_to_fixed_type_p (exp, 0)) |
84a43794 MS |
266 | { |
267 | /* build reference to type_info from vtable. */ | |
da3d4dfa | 268 | tree index; |
84a43794 | 269 | |
8fa33dfa | 270 | /* The RTTI information is at index -1. */ |
4a90aeeb | 271 | index = build_int_cst (NULL_TREE, |
7d60be94 | 272 | -1 * TARGET_VTABLE_DATA_ENTRY_DISTANCE); |
b5d1cbd2 | 273 | t = build_vtbl_ref (exp, index); |
6de9cd9a | 274 | t = convert (type_info_ptr_type, t); |
84a43794 | 275 | } |
2050a1bb MM |
276 | else |
277 | /* Otherwise return the type_info for the static type of the expr. */ | |
278 | t = get_tinfo_ptr (TYPE_MAIN_VARIANT (type)); | |
84a43794 | 279 | |
795801d6 | 280 | return cp_build_indirect_ref (t, RO_NULL, complain); |
5156628f MS |
281 | } |
282 | ||
7f54a851 | 283 | static bool |
848eed92 | 284 | typeid_ok_p (void) |
5156628f | 285 | { |
3a44f395 JJ |
286 | tree pseudo_type_info, type_info_type; |
287 | ||
f915e937 NS |
288 | if (! flag_rtti) |
289 | { | |
290 | error ("cannot use typeid with -fno-rtti"); | |
7f54a851 | 291 | return false; |
f915e937 | 292 | } |
c8094d83 | 293 | |
db24eb1f | 294 | if (!COMPLETE_TYPE_P (const_type_info_type_node)) |
6a8f78d5 JM |
295 | { |
296 | error ("must #include <typeinfo> before using typeid"); | |
7f54a851 | 297 | return false; |
6a8f78d5 | 298 | } |
c8094d83 | 299 | |
9771b263 | 300 | pseudo_type_info = (*tinfo_descs)[TK_TYPE_INFO_TYPE].type; |
3a44f395 JJ |
301 | type_info_type = TYPE_MAIN_VARIANT (const_type_info_type_node); |
302 | ||
303 | /* Make sure abi::__type_info_pseudo has the same alias set | |
304 | as std::type_info. */ | |
305 | if (! TYPE_ALIAS_SET_KNOWN_P (pseudo_type_info)) | |
306 | TYPE_ALIAS_SET (pseudo_type_info) = get_alias_set (type_info_type); | |
307 | else | |
308 | gcc_assert (TYPE_ALIAS_SET (pseudo_type_info) | |
309 | == get_alias_set (type_info_type)); | |
310 | ||
7f54a851 NS |
311 | return true; |
312 | } | |
313 | ||
2050a1bb MM |
314 | /* Return an expression for "typeid(EXP)". The expression returned is |
315 | an lvalue of type "const std::type_info". */ | |
316 | ||
7f54a851 | 317 | tree |
795801d6 | 318 | build_typeid (tree exp, tsubst_flags_t complain) |
7f54a851 | 319 | { |
03a904b5 | 320 | tree cond = NULL_TREE, initial_expr = exp; |
7f54a851 NS |
321 | int nonnull = 0; |
322 | ||
323 | if (exp == error_mark_node || !typeid_ok_p ()) | |
324 | return error_mark_node; | |
325 | ||
5156628f | 326 | if (processing_template_decl) |
db24eb1f | 327 | return build_min (TYPEID_EXPR, const_type_info_type_node, exp); |
5156628f | 328 | |
fa2200cb JM |
329 | /* FIXME when integrating with c_fully_fold, mark |
330 | resolves_to_fixed_type_p case as a non-constant expression. */ | |
c87e82a6 | 331 | if (TYPE_POLYMORPHIC_P (TREE_TYPE (exp)) |
5156628f MS |
332 | && ! resolves_to_fixed_type_p (exp, &nonnull) |
333 | && ! nonnull) | |
334 | { | |
03a904b5 | 335 | /* So we need to look into the vtable of the type of exp. |
c87e82a6 JM |
336 | Make sure it isn't a null lvalue. */ |
337 | exp = cp_build_addr_expr (exp, complain); | |
5156628f | 338 | exp = stabilize_reference (exp); |
c87e82a6 JM |
339 | cond = cp_convert (boolean_type_node, exp, complain); |
340 | exp = cp_build_indirect_ref (exp, RO_NULL, complain); | |
5156628f MS |
341 | } |
342 | ||
795801d6 | 343 | exp = get_tinfo_decl_dynamic (exp, complain); |
9a3b49ac MS |
344 | |
345 | if (exp == error_mark_node) | |
346 | return error_mark_node; | |
347 | ||
5156628f MS |
348 | if (cond) |
349 | { | |
350 | tree bad = throw_bad_typeid (); | |
351 | ||
f293ce4b | 352 | exp = build3 (COND_EXPR, TREE_TYPE (exp), cond, exp, bad); |
5156628f | 353 | } |
03a904b5 JJ |
354 | else |
355 | mark_type_use (initial_expr); | |
5156628f | 356 | |
2050a1bb | 357 | return exp; |
84a43794 MS |
358 | } |
359 | ||
52669d59 JQ |
360 | /* Generate the NTBS name of a type. If MARK_PRIVATE, put a '*' in front so that |
361 | comparisons will be done by pointer rather than string comparison. */ | |
db1147b2 | 362 | static tree |
52669d59 | 363 | tinfo_name (tree type, bool mark_private) |
db1147b2 | 364 | { |
1f6e1acc | 365 | const char *name; |
52669d59 | 366 | int length; |
1f6e1acc AS |
367 | tree name_string; |
368 | ||
52669d59 JQ |
369 | name = mangle_type_string (type); |
370 | length = strlen (name); | |
371 | ||
372 | if (mark_private) | |
373 | { | |
374 | /* Inject '*' at beginning of name to force pointer comparison. */ | |
c86f25e8 | 375 | char* buf = (char*) XALLOCAVEC (char, length + 2); |
52669d59 | 376 | buf[0] = '*'; |
c86f25e8 JM |
377 | memcpy (buf + 1, name, length + 1); |
378 | name_string = build_string (length + 2, buf); | |
52669d59 JQ |
379 | } |
380 | else | |
381 | name_string = build_string (length + 1, name); | |
382 | ||
383 | return fix_string_type (name_string); | |
db1147b2 NS |
384 | } |
385 | ||
d689a8f1 NS |
386 | /* Return a VAR_DECL for the internal ABI defined type_info object for |
387 | TYPE. You must arrange that the decl is mark_used, if actually use | |
c8094d83 | 388 | it --- decls in vtables are only used if the vtable is output. */ |
794d4a61 | 389 | |
6b5fbb55 | 390 | tree |
848eed92 | 391 | get_tinfo_decl (tree type) |
6b5fbb55 | 392 | { |
9a3b49ac | 393 | tree name; |
6b5fbb55 MS |
394 | tree d; |
395 | ||
f19218e5 | 396 | if (variably_modified_type_p (type, /*fn=*/NULL_TREE)) |
0c918ce5 | 397 | { |
a57dbdaa JM |
398 | if (array_of_runtime_bound_p (type)) |
399 | error ("typeid of array of runtime bound"); | |
400 | else | |
401 | error ("cannot create type information for type %qT because " | |
402 | "it involves types of variable size", | |
403 | type); | |
0c918ce5 MM |
404 | return error_mark_node; |
405 | } | |
406 | ||
9a3b49ac MS |
407 | if (TREE_CODE (type) == METHOD_TYPE) |
408 | type = build_function_type (TREE_TYPE (type), | |
409 | TREE_CHAIN (TYPE_ARG_TYPES (type))); | |
410 | ||
17d208b5 JM |
411 | type = complete_type (type); |
412 | ||
a82d6da5 MM |
413 | /* For a class type, the variable is cached in the type node |
414 | itself. */ | |
415 | if (CLASS_TYPE_P (type)) | |
416 | { | |
417 | d = CLASSTYPE_TYPEINFO_VAR (TYPE_MAIN_VARIANT (type)); | |
418 | if (d) | |
419 | return d; | |
420 | } | |
c8094d83 | 421 | |
1f84ec23 | 422 | name = mangle_typeinfo_for_type (type); |
669ec2b4 | 423 | |
7267d692 | 424 | d = IDENTIFIER_GLOBAL_VALUE (name); |
d689a8f1 | 425 | if (!d) |
7267d692 | 426 | { |
fe93f42f | 427 | int ix = get_pseudo_ti_index (type); |
9771b263 | 428 | tinfo_s *ti = &(*tinfo_descs)[ix]; |
d689a8f1 | 429 | |
1bf5fc34 | 430 | d = build_lang_decl (VAR_DECL, name, ti->type); |
4684cd27 | 431 | SET_DECL_ASSEMBLER_NAME (d, name); |
73a8adb6 MM |
432 | /* Remember the type it is for. */ |
433 | TREE_TYPE (name) = type; | |
4684cd27 | 434 | DECL_TINFO_P (d) = 1; |
7267d692 | 435 | DECL_ARTIFICIAL (d) = 1; |
78e0d62b | 436 | DECL_IGNORED_P (d) = 1; |
7267d692 NS |
437 | TREE_READONLY (d) = 1; |
438 | TREE_STATIC (d) = 1; | |
4684cd27 MM |
439 | /* Mark the variable as undefined -- but remember that we can |
440 | define it later if we need to do so. */ | |
7267d692 | 441 | DECL_EXTERNAL (d) = 1; |
4684cd27 | 442 | DECL_NOT_REALLY_EXTERN (d) = 1; |
d71176b6 GK |
443 | set_linkage_according_to_type (type, d); |
444 | ||
445 | d = pushdecl_top_level_and_finish (d, NULL_TREE); | |
73a8adb6 MM |
446 | if (CLASS_TYPE_P (type)) |
447 | CLASSTYPE_TYPEINFO_VAR (TYPE_MAIN_VARIANT (type)) = d; | |
d689a8f1 | 448 | |
9bcb9aae | 449 | /* Add decl to the global array of tinfo decls. */ |
9771b263 | 450 | vec_safe_push (unemitted_tinfo_decls, d); |
7267d692 | 451 | } |
d689a8f1 | 452 | |
6b5fbb55 MS |
453 | return d; |
454 | } | |
455 | ||
d689a8f1 NS |
456 | /* Return a pointer to a type_info object describing TYPE, suitably |
457 | cast to the language defined type. */ | |
458 | ||
459 | static tree | |
848eed92 | 460 | get_tinfo_ptr (tree type) |
d689a8f1 | 461 | { |
bb4f6e6b JH |
462 | tree decl = get_tinfo_decl (type); |
463 | ||
464 | mark_used (decl); | |
c8094d83 | 465 | return build_nop (type_info_ptr_type, |
bb4f6e6b | 466 | build_address (decl)); |
d689a8f1 NS |
467 | } |
468 | ||
e5f614d7 | 469 | /* Return the type_info object for TYPE. */ |
e92cc029 | 470 | |
84a43794 | 471 | tree |
795801d6 | 472 | get_typeid (tree type, tsubst_flags_t complain) |
84a43794 | 473 | { |
7f54a851 | 474 | if (type == error_mark_node || !typeid_ok_p ()) |
84a43794 | 475 | return error_mark_node; |
c8094d83 | 476 | |
e9f32eb5 | 477 | if (processing_template_decl) |
db24eb1f | 478 | return build_min (TYPEID_EXPR, const_type_info_type_node, type); |
e9f32eb5 | 479 | |
6b5fbb55 MS |
480 | /* If the type of the type-id is a reference type, the result of the |
481 | typeid expression refers to a type_info object representing the | |
482 | referenced type. */ | |
ee76b931 | 483 | type = non_reference (type); |
84a43794 | 484 | |
80f7a782 JM |
485 | /* This is not one of the uses of a qualified function type in 8.3.5. */ |
486 | if (TREE_CODE (type) == FUNCTION_TYPE | |
487 | && (type_memfn_quals (type) != TYPE_UNQUALIFIED | |
488 | || type_memfn_rqual (type) != REF_QUAL_NONE)) | |
489 | { | |
490 | if (complain & tf_error) | |
491 | error ("typeid of qualified function type %qT", type); | |
492 | return error_mark_node; | |
493 | } | |
494 | ||
6b5fbb55 | 495 | /* The top-level cv-qualifiers of the lvalue expression or the type-id |
e92cc029 | 496 | that is the operand of typeid are always ignored. */ |
6b5fbb55 | 497 | type = TYPE_MAIN_VARIANT (type); |
84a43794 | 498 | |
41b059f3 | 499 | /* For UNKNOWN_TYPEs call complete_type_or_else to get diagnostics. */ |
fbfc8363 JM |
500 | if (CLASS_TYPE_P (type) || type == unknown_type_node |
501 | || type == init_list_type_node) | |
795801d6 | 502 | type = complete_type_or_maybe_complain (type, NULL_TREE, complain); |
c8094d83 | 503 | |
e5f614d7 NS |
504 | if (!type) |
505 | return error_mark_node; | |
6a8f78d5 | 506 | |
795801d6 | 507 | return cp_build_indirect_ref (get_tinfo_ptr (type), RO_NULL, complain); |
84a43794 MS |
508 | } |
509 | ||
a80e4195 MS |
510 | /* Check whether TEST is null before returning RESULT. If TEST is used in |
511 | RESULT, it must have previously had a save_expr applied to it. */ | |
512 | ||
824b9a4c | 513 | static tree |
4b978f96 | 514 | ifnonnull (tree test, tree result, tsubst_flags_t complain) |
a80e4195 | 515 | { |
f293ce4b | 516 | return build3 (COND_EXPR, TREE_TYPE (result), |
c8094d83 | 517 | build2 (EQ_EXPR, boolean_type_node, test, |
4b978f96 PC |
518 | cp_convert (TREE_TYPE (test), nullptr_node, |
519 | complain)), | |
520 | cp_convert (TREE_TYPE (result), nullptr_node, complain), | |
f293ce4b | 521 | result); |
a80e4195 MS |
522 | } |
523 | ||
84a43794 MS |
524 | /* Execute a dynamic cast, as described in section 5.2.6 of the 9/93 working |
525 | paper. */ | |
6b5fbb55 | 526 | |
42976354 | 527 | static tree |
5ade1ed2 | 528 | build_dynamic_cast_1 (tree type, tree expr, tsubst_flags_t complain) |
84a43794 MS |
529 | { |
530 | enum tree_code tc = TREE_CODE (type); | |
63891ba2 | 531 | tree exprtype; |
6b5fbb55 | 532 | tree dcast_fn; |
6a8f78d5 | 533 | tree old_expr = expr; |
c2e407f1 | 534 | const char *errstr = NULL; |
84a43794 | 535 | |
8d8d1a28 AH |
536 | /* Save casted types in the function's used types hash table. */ |
537 | used_types_insert (type); | |
538 | ||
64b83f2a SG |
539 | /* T shall be a pointer or reference to a complete class type, or |
540 | `pointer to cv void''. */ | |
84a43794 MS |
541 | switch (tc) |
542 | { | |
543 | case POINTER_TYPE: | |
50e10fa8 | 544 | if (VOID_TYPE_P (TREE_TYPE (type))) |
84a43794 | 545 | break; |
db24eb1f | 546 | /* Fall through. */ |
84a43794 | 547 | case REFERENCE_TYPE: |
9e1e64ec | 548 | if (! MAYBE_CLASS_TYPE_P (TREE_TYPE (type))) |
64b83f2a | 549 | { |
4cd5a50a | 550 | errstr = _("target is not pointer or reference to class"); |
64b83f2a SG |
551 | goto fail; |
552 | } | |
d0f062fb | 553 | if (!COMPLETE_TYPE_P (complete_type (TREE_TYPE (type)))) |
64b83f2a | 554 | { |
4cd5a50a | 555 | errstr = _("target is not pointer or reference to complete type"); |
64b83f2a SG |
556 | goto fail; |
557 | } | |
cdf5b885 | 558 | break; |
64b83f2a | 559 | |
84a43794 | 560 | default: |
4cd5a50a | 561 | errstr = _("target is not pointer or reference"); |
84a43794 MS |
562 | goto fail; |
563 | } | |
564 | ||
64b83f2a | 565 | if (tc == POINTER_TYPE) |
84a43794 | 566 | { |
89fcabaf | 567 | expr = decay_conversion (expr, complain); |
63891ba2 PC |
568 | exprtype = TREE_TYPE (expr); |
569 | ||
64b83f2a SG |
570 | /* If T is a pointer type, v shall be an rvalue of a pointer to |
571 | complete class type, and the result is an rvalue of type T. */ | |
572 | ||
03a904b5 JJ |
573 | expr = mark_rvalue_use (expr); |
574 | ||
50e10fa8 | 575 | if (!TYPE_PTR_P (exprtype)) |
64b83f2a | 576 | { |
4cd5a50a | 577 | errstr = _("source is not a pointer"); |
64b83f2a SG |
578 | goto fail; |
579 | } | |
9e1e64ec | 580 | if (! MAYBE_CLASS_TYPE_P (TREE_TYPE (exprtype))) |
64b83f2a | 581 | { |
4cd5a50a | 582 | errstr = _("source is not a pointer to class"); |
64b83f2a SG |
583 | goto fail; |
584 | } | |
d0f062fb | 585 | if (!COMPLETE_TYPE_P (complete_type (TREE_TYPE (exprtype)))) |
64b83f2a | 586 | { |
4cd5a50a | 587 | errstr = _("source is a pointer to incomplete type"); |
64b83f2a SG |
588 | goto fail; |
589 | } | |
590 | } | |
591 | else | |
592 | { | |
03a904b5 JJ |
593 | expr = mark_lvalue_use (expr); |
594 | ||
63891ba2 | 595 | exprtype = build_reference_type (TREE_TYPE (expr)); |
db24eb1f | 596 | |
64b83f2a SG |
597 | /* T is a reference type, v shall be an lvalue of a complete class |
598 | type, and the result is an lvalue of the type referred to by T. */ | |
599 | ||
9e1e64ec | 600 | if (! MAYBE_CLASS_TYPE_P (TREE_TYPE (exprtype))) |
64b83f2a | 601 | { |
4cd5a50a | 602 | errstr = _("source is not of class type"); |
64b83f2a SG |
603 | goto fail; |
604 | } | |
d0f062fb | 605 | if (!COMPLETE_TYPE_P (complete_type (TREE_TYPE (exprtype)))) |
64b83f2a | 606 | { |
4cd5a50a | 607 | errstr = _("source is of incomplete class type"); |
64b83f2a SG |
608 | goto fail; |
609 | } | |
c8094d83 | 610 | |
d149fba0 VR |
611 | /* Apply trivial conversion T -> T& for dereferenced ptrs. */ |
612 | expr = convert_to_reference (exprtype, expr, CONV_IMPLICIT, | |
4b978f96 | 613 | LOOKUP_NORMAL, NULL_TREE, complain); |
64b83f2a SG |
614 | } |
615 | ||
616 | /* The dynamic_cast operator shall not cast away constness. */ | |
617 | if (!at_least_as_qualified_p (TREE_TYPE (type), | |
618 | TREE_TYPE (exprtype))) | |
619 | { | |
4cd5a50a | 620 | errstr = _("conversion casts away constness"); |
64b83f2a | 621 | goto fail; |
84a43794 MS |
622 | } |
623 | ||
624 | /* If *type is an unambiguous accessible base class of *exprtype, | |
625 | convert statically. */ | |
626 | { | |
ffe7516f PC |
627 | tree binfo = lookup_base (TREE_TYPE (exprtype), TREE_TYPE (type), |
628 | ba_check, NULL, complain); | |
338d90b8 | 629 | if (binfo) |
ffe7516f | 630 | return build_static_cast (type, expr, complain); |
84a43794 MS |
631 | } |
632 | ||
633 | /* Otherwise *exprtype must be a polymorphic class (have a vtbl). */ | |
4c6b7393 | 634 | if (TYPE_POLYMORPHIC_P (TREE_TYPE (exprtype))) |
84a43794 | 635 | { |
a80e4195 | 636 | tree expr1; |
84a43794 | 637 | /* if TYPE is `void *', return pointer to complete object. */ |
b72801e2 | 638 | if (tc == POINTER_TYPE && VOID_TYPE_P (TREE_TYPE (type))) |
84a43794 MS |
639 | { |
640 | /* if b is an object, dynamic_cast<void *>(&b) == (void *)&b. */ | |
641 | if (TREE_CODE (expr) == ADDR_EXPR | |
5a6ccc94 | 642 | && VAR_P (TREE_OPERAND (expr, 0)) |
84a43794 MS |
643 | && TREE_CODE (TREE_TYPE (TREE_OPERAND (expr, 0))) == RECORD_TYPE) |
644 | return build1 (NOP_EXPR, type, expr); | |
645 | ||
a80e4195 MS |
646 | /* Since expr is used twice below, save it. */ |
647 | expr = save_expr (expr); | |
648 | ||
649 | expr1 = build_headof (expr); | |
650 | if (TREE_TYPE (expr1) != type) | |
651 | expr1 = build1 (NOP_EXPR, type, expr1); | |
4b978f96 | 652 | return ifnonnull (expr, expr1, complain); |
84a43794 MS |
653 | } |
654 | else | |
655 | { | |
656 | tree retval; | |
94a0dd7b SL |
657 | tree result, td2, td3; |
658 | tree elems[4]; | |
0cbd7506 | 659 | tree static_type, target_type, boff; |
84a43794 | 660 | |
0cbd7506 | 661 | /* If we got here, we can't convert statically. Therefore, |
84a43794 | 662 | dynamic_cast<D&>(b) (b an object) cannot succeed. */ |
64b83f2a | 663 | if (tc == REFERENCE_TYPE) |
84a43794 | 664 | { |
5a6ccc94 | 665 | if (VAR_P (old_expr) |
6a8f78d5 | 666 | && TREE_CODE (TREE_TYPE (old_expr)) == RECORD_TYPE) |
84a43794 | 667 | { |
0cbd7506 | 668 | tree expr = throw_bad_cast (); |
5ade1ed2 DG |
669 | if (complain & tf_warning) |
670 | warning (0, "dynamic_cast of %q#D to %q#T can never succeed", | |
671 | old_expr, type); | |
0cbd7506 MS |
672 | /* Bash it to the expected type. */ |
673 | TREE_TYPE (expr) = type; | |
059fa5e7 | 674 | return expr; |
84a43794 MS |
675 | } |
676 | } | |
677 | /* Ditto for dynamic_cast<D*>(&b). */ | |
678 | else if (TREE_CODE (expr) == ADDR_EXPR) | |
679 | { | |
680 | tree op = TREE_OPERAND (expr, 0); | |
5a6ccc94 | 681 | if (VAR_P (op) |
84a43794 MS |
682 | && TREE_CODE (TREE_TYPE (op)) == RECORD_TYPE) |
683 | { | |
5ade1ed2 DG |
684 | if (complain & tf_warning) |
685 | warning (0, "dynamic_cast of %q#D to %q#T can never succeed", | |
686 | op, type); | |
c8094d83 | 687 | retval = build_int_cst (type, 0); |
84a43794 MS |
688 | return retval; |
689 | } | |
690 | } | |
691 | ||
6c9384c3 BS |
692 | /* Use of dynamic_cast when -fno-rtti is prohibited. */ |
693 | if (!flag_rtti) | |
694 | { | |
5ade1ed2 DG |
695 | if (complain & tf_error) |
696 | error ("%<dynamic_cast%> not permitted with -fno-rtti"); | |
6c9384c3 BS |
697 | return error_mark_node; |
698 | } | |
699 | ||
7267d692 NS |
700 | target_type = TYPE_MAIN_VARIANT (TREE_TYPE (type)); |
701 | static_type = TYPE_MAIN_VARIANT (TREE_TYPE (exprtype)); | |
bb4f6e6b JH |
702 | td2 = get_tinfo_decl (target_type); |
703 | mark_used (td2); | |
93c0e0bb | 704 | td2 = cp_build_addr_expr (td2, complain); |
bb4f6e6b JH |
705 | td3 = get_tinfo_decl (static_type); |
706 | mark_used (td3); | |
93c0e0bb | 707 | td3 = cp_build_addr_expr (td3, complain); |
7267d692 | 708 | |
0cbd7506 MS |
709 | /* Determine how T and V are related. */ |
710 | boff = dcast_base_hint (static_type, target_type); | |
c8094d83 | 711 | |
6b5fbb55 MS |
712 | /* Since expr is used twice below, save it. */ |
713 | expr = save_expr (expr); | |
714 | ||
84a43794 MS |
715 | expr1 = expr; |
716 | if (tc == REFERENCE_TYPE) | |
93c0e0bb | 717 | expr1 = cp_build_addr_expr (expr1, complain); |
84a43794 | 718 | |
94a0dd7b SL |
719 | elems[0] = expr1; |
720 | elems[1] = td3; | |
721 | elems[2] = td2; | |
722 | elems[3] = boff; | |
6b5fbb55 | 723 | |
059fa5e7 NS |
724 | dcast_fn = dynamic_cast_node; |
725 | if (!dcast_fn) | |
6b5fbb55 MS |
726 | { |
727 | tree tmp; | |
7267d692 | 728 | tree tinfo_ptr; |
7267d692 | 729 | const char *name; |
c8094d83 | 730 | |
a15f0fd0 | 731 | push_abi_namespace (); |
88e5899c | 732 | tinfo_ptr = xref_tag (class_type, |
8fa33dfa | 733 | get_identifier ("__class_type_info"), |
bd3d082e | 734 | /*tag_scope=*/ts_current, false); |
c8094d83 | 735 | |
8fa33dfa | 736 | tinfo_ptr = build_pointer_type |
a3360e77 | 737 | (cp_build_qualified_type |
8fa33dfa MM |
738 | (tinfo_ptr, TYPE_QUAL_CONST)); |
739 | name = "__dynamic_cast"; | |
0244e6f7 NF |
740 | tmp = build_function_type_list (ptr_type_node, |
741 | const_ptr_type_node, | |
742 | tinfo_ptr, tinfo_ptr, | |
743 | ptrdiff_type_node, NULL_TREE); | |
fafa0521 JH |
744 | dcast_fn = build_library_fn_ptr (name, tmp, |
745 | ECF_LEAF | ECF_PURE | ECF_NOTHROW); | |
a15f0fd0 | 746 | pop_abi_namespace (); |
0cbd7506 | 747 | dynamic_cast_node = dcast_fn; |
6b5fbb55 | 748 | } |
e2e03032 | 749 | result = build_cxx_call (dcast_fn, 4, elems, complain); |
84a43794 MS |
750 | |
751 | if (tc == REFERENCE_TYPE) | |
752 | { | |
7267d692 | 753 | tree bad = throw_bad_cast (); |
a0c04f8e | 754 | tree neq; |
c8094d83 | 755 | |
84a43794 | 756 | result = save_expr (result); |
23ffb99e | 757 | neq = cp_truthvalue_conversion (result); |
c74147d2 RG |
758 | return cp_convert (type, |
759 | build3 (COND_EXPR, TREE_TYPE (result), | |
4b978f96 | 760 | neq, result, bad), complain); |
84a43794 MS |
761 | } |
762 | ||
e92cc029 | 763 | /* Now back to the type we want from a void*. */ |
4b978f96 PC |
764 | result = cp_convert (type, result, complain); |
765 | return ifnonnull (expr, result, complain); | |
84a43794 MS |
766 | } |
767 | } | |
64b83f2a | 768 | else |
4cd5a50a | 769 | errstr = _("source type is not polymorphic"); |
0f4d5c1c | 770 | |
84a43794 | 771 | fail: |
5ade1ed2 DG |
772 | if (complain & tf_error) |
773 | error ("cannot dynamic_cast %qE (of type %q#T) to type %q#T (%s)", | |
63891ba2 | 774 | old_expr, TREE_TYPE (old_expr), type, errstr); |
84a43794 MS |
775 | return error_mark_node; |
776 | } | |
42976354 BK |
777 | |
778 | tree | |
5ade1ed2 | 779 | build_dynamic_cast (tree type, tree expr, tsubst_flags_t complain) |
42976354 | 780 | { |
04398fa8 PC |
781 | tree r; |
782 | ||
328d03d7 JM |
783 | if (type == error_mark_node || expr == error_mark_node) |
784 | return error_mark_node; | |
c8094d83 | 785 | |
328d03d7 | 786 | if (processing_template_decl) |
8e1daa34 NS |
787 | { |
788 | expr = build_min (DYNAMIC_CAST_EXPR, type, expr); | |
789 | TREE_SIDE_EFFECTS (expr) = 1; | |
61a861e6 | 790 | return convert_from_reference (expr); |
8e1daa34 | 791 | } |
328d03d7 | 792 | |
04398fa8 PC |
793 | r = convert_from_reference (build_dynamic_cast_1 (type, expr, complain)); |
794 | if (r != error_mark_node) | |
795 | maybe_warn_about_useless_cast (type, expr, complain); | |
796 | return r; | |
42976354 | 797 | } |
04398fa8 | 798 | |
7267d692 NS |
799 | /* Return the runtime bit mask encoding the qualifiers of TYPE. */ |
800 | ||
801 | static int | |
848eed92 | 802 | qualifier_flags (tree type) |
7267d692 NS |
803 | { |
804 | int flags = 0; | |
05abed76 | 805 | int quals = cp_type_quals (type); |
c8094d83 | 806 | |
7267d692 NS |
807 | if (quals & TYPE_QUAL_CONST) |
808 | flags |= 1; | |
809 | if (quals & TYPE_QUAL_VOLATILE) | |
810 | flags |= 2; | |
6d61f400 NS |
811 | if (quals & TYPE_QUAL_RESTRICT) |
812 | flags |= 4; | |
7267d692 NS |
813 | return flags; |
814 | } | |
815 | ||
848eed92 | 816 | /* Return true, if the pointer chain TYPE ends at an incomplete type, or |
0a240972 NS |
817 | contains a pointer to member of an incomplete class. */ |
818 | ||
848eed92 GDR |
819 | static bool |
820 | target_incomplete_p (tree type) | |
0a240972 | 821 | { |
a5ac359a | 822 | while (true) |
66b1156a | 823 | if (TYPE_PTRDATAMEM_P (type)) |
0a240972 | 824 | { |
a5ac359a MM |
825 | if (!COMPLETE_TYPE_P (TYPE_PTRMEM_CLASS_TYPE (type))) |
826 | return true; | |
827 | type = TYPE_PTRMEM_POINTED_TO_TYPE (type); | |
0a240972 | 828 | } |
50e10fa8 | 829 | else if (TYPE_PTR_P (type)) |
0a240972 | 830 | type = TREE_TYPE (type); |
a5ac359a MM |
831 | else |
832 | return !COMPLETE_OR_VOID_TYPE_P (type); | |
0a240972 NS |
833 | } |
834 | ||
4684cd27 MM |
835 | /* Returns true if TYPE involves an incomplete class type; in that |
836 | case, typeinfo variables for TYPE should be emitted with internal | |
837 | linkage. */ | |
838 | ||
839 | static bool | |
840 | involves_incomplete_p (tree type) | |
841 | { | |
842 | switch (TREE_CODE (type)) | |
843 | { | |
844 | case POINTER_TYPE: | |
845 | return target_incomplete_p (TREE_TYPE (type)); | |
846 | ||
847 | case OFFSET_TYPE: | |
848 | ptrmem: | |
c8094d83 | 849 | return |
4684cd27 MM |
850 | (target_incomplete_p (TYPE_PTRMEM_POINTED_TO_TYPE (type)) |
851 | || !COMPLETE_TYPE_P (TYPE_PTRMEM_CLASS_TYPE (type))); | |
852 | ||
853 | case RECORD_TYPE: | |
854 | if (TYPE_PTRMEMFUNC_P (type)) | |
855 | goto ptrmem; | |
856 | /* Fall through. */ | |
857 | case UNION_TYPE: | |
858 | if (!COMPLETE_TYPE_P (type)) | |
859 | return true; | |
860 | ||
861 | default: | |
862 | /* All other types do not involve incomplete class types. */ | |
863 | return false; | |
864 | } | |
865 | } | |
866 | ||
7267d692 | 867 | /* Return a CONSTRUCTOR for the common part of the type_info objects. This |
0a240972 NS |
868 | is the vtable pointer and NTBS name. The NTBS name is emitted as a |
869 | comdat const char array, so it becomes a unique key for the type. Generate | |
870 | and emit that VAR_DECL here. (We can't always emit the type_info itself | |
871 | as comdat, because of pointers to incomplete.) */ | |
7267d692 NS |
872 | |
873 | static tree | |
1bf5fc34 | 874 | tinfo_base_init (tinfo_s *ti, tree target) |
7267d692 | 875 | { |
e20463aa | 876 | tree init; |
0a240972 | 877 | tree name_decl; |
d689a8f1 | 878 | tree vtable_ptr; |
9771b263 | 879 | vec<constructor_elt, va_gc> *v; |
c8094d83 | 880 | |
0a240972 | 881 | { |
52669d59 | 882 | tree name_name, name_string; |
c8094d83 | 883 | |
0a240972 | 884 | /* Generate the NTBS array variable. */ |
0a240972 | 885 | tree name_type = build_cplus_array_type |
a3360e77 | 886 | (cp_build_qualified_type (char_type_node, TYPE_QUAL_CONST), |
0cbd7506 | 887 | NULL_TREE); |
1f6e1acc | 888 | |
4684cd27 MM |
889 | /* Determine the name of the variable -- and remember with which |
890 | type it is associated. */ | |
1f84ec23 | 891 | name_name = mangle_typeinfo_string_for_type (target); |
4684cd27 MM |
892 | TREE_TYPE (name_name) = target; |
893 | ||
0a240972 | 894 | name_decl = build_lang_decl (VAR_DECL, name_name, name_type); |
73a8adb6 | 895 | SET_DECL_ASSEMBLER_NAME (name_decl, name_name); |
0a240972 | 896 | DECL_ARTIFICIAL (name_decl) = 1; |
78e0d62b | 897 | DECL_IGNORED_P (name_decl) = 1; |
0a240972 NS |
898 | TREE_READONLY (name_decl) = 1; |
899 | TREE_STATIC (name_decl) = 1; | |
900 | DECL_EXTERNAL (name_decl) = 0; | |
4684cd27 | 901 | DECL_TINFO_P (name_decl) = 1; |
6e4be1fa | 902 | set_linkage_according_to_type (target, name_decl); |
4684cd27 | 903 | import_export_decl (name_decl); |
52669d59 | 904 | name_string = tinfo_name (target, !TREE_PUBLIC (name_decl)); |
0a240972 | 905 | DECL_INITIAL (name_decl) = name_string; |
bb4f6e6b | 906 | mark_used (name_decl); |
170b020f | 907 | pushdecl_top_level_and_finish (name_decl, name_string); |
0a240972 | 908 | } |
d689a8f1 | 909 | |
1bf5fc34 | 910 | vtable_ptr = ti->vtable; |
d689a8f1 | 911 | if (!vtable_ptr) |
7267d692 | 912 | { |
d689a8f1 | 913 | tree real_type; |
a15f0fd0 | 914 | push_abi_namespace (); |
1bf5fc34 | 915 | real_type = xref_tag (class_type, ti->name, |
bd3d082e | 916 | /*tag_scope=*/ts_current, false); |
a15f0fd0 | 917 | pop_abi_namespace (); |
c8094d83 | 918 | |
d689a8f1 NS |
919 | if (!COMPLETE_TYPE_P (real_type)) |
920 | { | |
0cbd7506 | 921 | /* We never saw a definition of this type, so we need to |
d689a8f1 NS |
922 | tell the compiler that this is an exported class, as |
923 | indeed all of the __*_type_info classes are. */ | |
924 | SET_CLASSTYPE_INTERFACE_KNOWN (real_type); | |
925 | CLASSTYPE_INTERFACE_ONLY (real_type) = 1; | |
926 | } | |
927 | ||
928 | vtable_ptr = get_vtable_decl (real_type, /*complete=*/1); | |
93c0e0bb | 929 | vtable_ptr = cp_build_addr_expr (vtable_ptr, tf_warning_or_error); |
d689a8f1 NS |
930 | |
931 | /* We need to point into the middle of the vtable. */ | |
5d49b6a7 RG |
932 | vtable_ptr = fold_build_pointer_plus |
933 | (vtable_ptr, | |
d689a8f1 NS |
934 | size_binop (MULT_EXPR, |
935 | size_int (2 * TARGET_VTABLE_DATA_ENTRY_DISTANCE), | |
936 | TYPE_SIZE_UNIT (vtable_entry_type))); | |
3db45ab5 | 937 | |
1bf5fc34 | 938 | ti->vtable = vtable_ptr; |
7267d692 | 939 | } |
d689a8f1 | 940 | |
9771b263 | 941 | vec_alloc (v, 2); |
e20463aa | 942 | CONSTRUCTOR_APPEND_ELT (v, NULL_TREE, vtable_ptr); |
89fcabaf PC |
943 | CONSTRUCTOR_APPEND_ELT (v, NULL_TREE, |
944 | decay_conversion (name_decl, tf_warning_or_error)); | |
c8094d83 | 945 | |
e20463aa | 946 | init = build_constructor (init_list_type_node, v); |
6de9cd9a | 947 | TREE_CONSTANT (init) = 1; |
6de9cd9a | 948 | TREE_STATIC (init) = 1; |
c8094d83 | 949 | |
7267d692 NS |
950 | return init; |
951 | } | |
952 | ||
1bf5fc34 | 953 | /* Return the CONSTRUCTOR expr for a type_info of TYPE. TI provides the |
7267d692 NS |
954 | information about the particular type_info derivation, which adds no |
955 | additional fields to the type_info base. */ | |
956 | ||
957 | static tree | |
1bf5fc34 | 958 | generic_initializer (tinfo_s *ti, tree target) |
7267d692 | 959 | { |
1bf5fc34 | 960 | tree init = tinfo_base_init (ti, target); |
3db45ab5 | 961 | |
e20463aa | 962 | init = build_constructor_single (init_list_type_node, NULL_TREE, init); |
6de9cd9a | 963 | TREE_CONSTANT (init) = 1; |
6de9cd9a | 964 | TREE_STATIC (init) = 1; |
7267d692 NS |
965 | return init; |
966 | } | |
967 | ||
1f4cb92b | 968 | /* Return the CONSTRUCTOR expr for a type_info of pointer TYPE. |
1bf5fc34 | 969 | TI provides information about the particular type_info derivation, |
7267d692 NS |
970 | which adds target type and qualifier flags members to the type_info base. */ |
971 | ||
972 | static tree | |
1bf5fc34 | 973 | ptr_initializer (tinfo_s *ti, tree target) |
7267d692 | 974 | { |
1bf5fc34 | 975 | tree init = tinfo_base_init (ti, target); |
7267d692 NS |
976 | tree to = TREE_TYPE (target); |
977 | int flags = qualifier_flags (to); | |
848eed92 | 978 | bool incomplete = target_incomplete_p (to); |
9771b263 DN |
979 | vec<constructor_elt, va_gc> *v; |
980 | vec_alloc (v, 3); | |
c8094d83 | 981 | |
0a240972 | 982 | if (incomplete) |
4684cd27 | 983 | flags |= 8; |
e20463aa NF |
984 | CONSTRUCTOR_APPEND_ELT (v, NULL_TREE, init); |
985 | CONSTRUCTOR_APPEND_ELT (v, NULL_TREE, build_int_cst (NULL_TREE, flags)); | |
986 | CONSTRUCTOR_APPEND_ELT (v, NULL_TREE, | |
987 | get_tinfo_ptr (TYPE_MAIN_VARIANT (to))); | |
c8094d83 | 988 | |
e20463aa | 989 | init = build_constructor (init_list_type_node, v); |
6de9cd9a | 990 | TREE_CONSTANT (init) = 1; |
6de9cd9a | 991 | TREE_STATIC (init) = 1; |
7267d692 NS |
992 | return init; |
993 | } | |
994 | ||
1f4cb92b | 995 | /* Return the CONSTRUCTOR expr for a type_info of pointer to member data TYPE. |
1bf5fc34 | 996 | TI provides information about the particular type_info derivation, |
0a240972 NS |
997 | which adds class, target type and qualifier flags members to the type_info |
998 | base. */ | |
7267d692 NS |
999 | |
1000 | static tree | |
1bf5fc34 | 1001 | ptm_initializer (tinfo_s *ti, tree target) |
7267d692 | 1002 | { |
1bf5fc34 | 1003 | tree init = tinfo_base_init (ti, target); |
7267d692 NS |
1004 | tree to = TYPE_PTRMEM_POINTED_TO_TYPE (target); |
1005 | tree klass = TYPE_PTRMEM_CLASS_TYPE (target); | |
1006 | int flags = qualifier_flags (to); | |
848eed92 | 1007 | bool incomplete = target_incomplete_p (to); |
9771b263 DN |
1008 | vec<constructor_elt, va_gc> *v; |
1009 | vec_alloc (v, 4); | |
c8094d83 | 1010 | |
0a240972 | 1011 | if (incomplete) |
4684cd27 | 1012 | flags |= 0x8; |
0a240972 | 1013 | if (!COMPLETE_TYPE_P (klass)) |
4684cd27 | 1014 | flags |= 0x10; |
e20463aa NF |
1015 | CONSTRUCTOR_APPEND_ELT (v, NULL_TREE, init); |
1016 | CONSTRUCTOR_APPEND_ELT (v, NULL_TREE, build_int_cst (NULL_TREE, flags)); | |
1017 | CONSTRUCTOR_APPEND_ELT (v, NULL_TREE, | |
1018 | get_tinfo_ptr (TYPE_MAIN_VARIANT (to))); | |
1019 | CONSTRUCTOR_APPEND_ELT (v, NULL_TREE, get_tinfo_ptr (klass)); | |
1020 | ||
1021 | init = build_constructor (init_list_type_node, v); | |
6de9cd9a | 1022 | TREE_CONSTANT (init) = 1; |
6de9cd9a | 1023 | TREE_STATIC (init) = 1; |
c8094d83 | 1024 | return init; |
7267d692 NS |
1025 | } |
1026 | ||
7267d692 | 1027 | /* Return the CONSTRUCTOR expr for a type_info of class TYPE. |
1bf5fc34 | 1028 | TI provides information about the particular __class_type_info derivation, |
e20463aa | 1029 | which adds hint flags and N extra initializers to the type_info base. */ |
7267d692 NS |
1030 | |
1031 | static tree | |
e20463aa | 1032 | class_initializer (tinfo_s *ti, tree target, unsigned n, ...) |
7267d692 | 1033 | { |
1bf5fc34 | 1034 | tree init = tinfo_base_init (ti, target); |
e20463aa NF |
1035 | va_list extra_inits; |
1036 | unsigned i; | |
9771b263 DN |
1037 | vec<constructor_elt, va_gc> *v; |
1038 | vec_alloc (v, n+1); | |
e20463aa NF |
1039 | |
1040 | CONSTRUCTOR_APPEND_ELT (v, NULL_TREE, init); | |
1041 | va_start (extra_inits, n); | |
1042 | for (i = 0; i < n; i++) | |
1043 | CONSTRUCTOR_APPEND_ELT (v, NULL_TREE, va_arg (extra_inits, tree)); | |
1044 | va_end (extra_inits); | |
c8094d83 | 1045 | |
e20463aa | 1046 | init = build_constructor (init_list_type_node, v); |
6de9cd9a | 1047 | TREE_CONSTANT (init) = 1; |
6de9cd9a | 1048 | TREE_STATIC (init) = 1; |
c8094d83 | 1049 | return init; |
7267d692 NS |
1050 | } |
1051 | ||
848eed92 | 1052 | /* Returns true if the typeinfo for type should be placed in |
97458258 MM |
1053 | the runtime library. */ |
1054 | ||
848eed92 GDR |
1055 | static bool |
1056 | typeinfo_in_lib_p (tree type) | |
97458258 MM |
1057 | { |
1058 | /* The typeinfo objects for `T*' and `const T*' are in the runtime | |
1059 | library for simple types T. */ | |
50e10fa8 | 1060 | if (TYPE_PTR_P (type) |
89d684bb BM |
1061 | && (cp_type_quals (TREE_TYPE (type)) == TYPE_QUAL_CONST |
1062 | || cp_type_quals (TREE_TYPE (type)) == TYPE_UNQUALIFIED)) | |
97458258 MM |
1063 | type = TREE_TYPE (type); |
1064 | ||
1065 | switch (TREE_CODE (type)) | |
1066 | { | |
1067 | case INTEGER_TYPE: | |
1068 | case BOOLEAN_TYPE: | |
97458258 MM |
1069 | case REAL_TYPE: |
1070 | case VOID_TYPE: | |
1e85e720 | 1071 | case NULLPTR_TYPE: |
848eed92 | 1072 | return true; |
c8094d83 | 1073 | |
5116acc6 | 1074 | case LANG_TYPE: |
1e85e720 | 1075 | /* fall through. */ |
5116acc6 | 1076 | |
97458258 | 1077 | default: |
848eed92 | 1078 | return false; |
97458258 MM |
1079 | } |
1080 | } | |
1081 | ||
1bf5fc34 NS |
1082 | /* Generate the initializer for the type info describing TYPE. TK_INDEX is |
1083 | the index of the descriptor in the tinfo_desc vector. */ | |
7267d692 NS |
1084 | |
1085 | static tree | |
1bf5fc34 | 1086 | get_pseudo_ti_init (tree type, unsigned tk_index) |
7267d692 | 1087 | { |
9771b263 | 1088 | tinfo_s *ti = &(*tinfo_descs)[tk_index]; |
3db45ab5 | 1089 | |
50bc768d | 1090 | gcc_assert (at_eof); |
1bf5fc34 | 1091 | switch (tk_index) |
7267d692 | 1092 | { |
1bf5fc34 NS |
1093 | case TK_POINTER_MEMBER_TYPE: |
1094 | return ptm_initializer (ti, type); | |
3db45ab5 | 1095 | |
1bf5fc34 NS |
1096 | case TK_POINTER_TYPE: |
1097 | return ptr_initializer (ti, type); | |
3db45ab5 | 1098 | |
1bf5fc34 NS |
1099 | case TK_BUILTIN_TYPE: |
1100 | case TK_ENUMERAL_TYPE: | |
1101 | case TK_FUNCTION_TYPE: | |
1102 | case TK_ARRAY_TYPE: | |
1103 | return generic_initializer (ti, type); | |
1104 | ||
1105 | case TK_CLASS_TYPE: | |
e20463aa | 1106 | return class_initializer (ti, type, 0); |
1bf5fc34 NS |
1107 | |
1108 | case TK_SI_CLASS_TYPE: | |
1109 | { | |
1110 | tree base_binfo = BINFO_BASE_BINFO (TYPE_BINFO (type), 0); | |
1111 | tree tinfo = get_tinfo_ptr (BINFO_TYPE (base_binfo)); | |
96d84476 JJ |
1112 | |
1113 | /* get_tinfo_ptr might have reallocated the tinfo_descs vector. */ | |
9771b263 | 1114 | ti = &(*tinfo_descs)[tk_index]; |
e20463aa | 1115 | return class_initializer (ti, type, 1, tinfo); |
1bf5fc34 | 1116 | } |
97458258 | 1117 | |
7267d692 | 1118 | default: |
1bf5fc34 NS |
1119 | { |
1120 | int hint = ((CLASSTYPE_REPEATED_BASE_P (type) << 0) | |
1121 | | (CLASSTYPE_DIAMOND_SHAPED_P (type) << 1)); | |
1122 | tree binfo = TYPE_BINFO (type); | |
1123 | int nbases = BINFO_N_BASE_BINFOS (binfo); | |
9771b263 | 1124 | vec<tree, va_gc> *base_accesses = BINFO_BASE_ACCESSES (binfo); |
1c773c7a | 1125 | tree offset_type = LONGPTR_T; |
1bf5fc34 NS |
1126 | tree base_inits = NULL_TREE; |
1127 | int ix; | |
9771b263 | 1128 | vec<constructor_elt, va_gc> *init_vec = NULL; |
e20463aa | 1129 | constructor_elt *e; |
3db45ab5 | 1130 | |
1bf5fc34 | 1131 | gcc_assert (tk_index >= TK_FIXED); |
3db45ab5 | 1132 | |
9771b263 | 1133 | vec_safe_grow (init_vec, nbases); |
1bf5fc34 NS |
1134 | /* Generate the base information initializer. */ |
1135 | for (ix = nbases; ix--;) | |
1136 | { | |
1137 | tree base_binfo = BINFO_BASE_BINFO (binfo, ix); | |
e20463aa | 1138 | tree base_init; |
1bf5fc34 NS |
1139 | int flags = 0; |
1140 | tree tinfo; | |
1141 | tree offset; | |
9771b263 | 1142 | vec<constructor_elt, va_gc> *v; |
3db45ab5 | 1143 | |
9771b263 | 1144 | if ((*base_accesses)[ix] == access_public_node) |
1bf5fc34 NS |
1145 | flags |= 2; |
1146 | tinfo = get_tinfo_ptr (BINFO_TYPE (base_binfo)); | |
1147 | if (BINFO_VIRTUAL_P (base_binfo)) | |
1148 | { | |
1149 | /* We store the vtable offset at which the virtual | |
3db45ab5 | 1150 | base offset can be found. */ |
1bf5fc34 | 1151 | offset = BINFO_VPTR_FIELD (base_binfo); |
1bf5fc34 NS |
1152 | flags |= 1; |
1153 | } | |
1154 | else | |
1155 | offset = BINFO_OFFSET (base_binfo); | |
3db45ab5 | 1156 | |
1bf5fc34 | 1157 | /* Combine offset and flags into one field. */ |
07b183fd | 1158 | offset = fold_convert (offset_type, offset); |
db3927fb AH |
1159 | offset = fold_build2_loc (input_location, |
1160 | LSHIFT_EXPR, offset_type, offset, | |
07b183fd | 1161 | build_int_cst (offset_type, 8)); |
db3927fb AH |
1162 | offset = fold_build2_loc (input_location, |
1163 | BIT_IOR_EXPR, offset_type, offset, | |
07b183fd | 1164 | build_int_cst (offset_type, flags)); |
9771b263 | 1165 | vec_alloc (v, 2); |
e20463aa NF |
1166 | CONSTRUCTOR_APPEND_ELT (v, NULL_TREE, tinfo); |
1167 | CONSTRUCTOR_APPEND_ELT (v, NULL_TREE, offset); | |
1168 | base_init = build_constructor (init_list_type_node, v); | |
9771b263 | 1169 | e = &(*init_vec)[ix]; |
e20463aa NF |
1170 | e->index = NULL_TREE; |
1171 | e->value = base_init; | |
1bf5fc34 | 1172 | } |
e20463aa | 1173 | base_inits = build_constructor (init_list_type_node, init_vec); |
96d84476 JJ |
1174 | |
1175 | /* get_tinfo_ptr might have reallocated the tinfo_descs vector. */ | |
9771b263 | 1176 | ti = &(*tinfo_descs)[tk_index]; |
e20463aa NF |
1177 | return class_initializer (ti, type, 3, |
1178 | build_int_cst (NULL_TREE, hint), | |
1179 | build_int_cst (NULL_TREE, nbases), | |
1180 | base_inits); | |
1bf5fc34 | 1181 | } |
7267d692 | 1182 | } |
7267d692 NS |
1183 | } |
1184 | ||
1185 | /* Generate the RECORD_TYPE containing the data layout of a type_info | |
1186 | derivative as used by the runtime. This layout must be consistent with | |
1187 | that defined in the runtime support. Also generate the VAR_DECL for the | |
1188 | type's vtable. We explicitly manage the vtable member, and name it for | |
1189 | real type as used in the runtime. The RECORD type has a different name, | |
1190 | to avoid collisions. Return a TREE_LIST who's TINFO_PSEUDO_TYPE | |
d689a8f1 NS |
1191 | is the generated type and TINFO_VTABLE_NAME is the name of the |
1192 | vtable. We have to delay generating the VAR_DECL of the vtable | |
1193 | until the end of the translation, when we'll have seen the library | |
1194 | definition, if there was one. | |
c8094d83 | 1195 | |
7267d692 NS |
1196 | REAL_NAME is the runtime's name of the type. Trailing arguments are |
1197 | additional FIELD_DECL's for the structure. The final argument must be | |
1198 | NULL. */ | |
1199 | ||
1bf5fc34 | 1200 | static void |
fe93f42f | 1201 | create_pseudo_type_info (int tk, const char *real_name, ...) |
7267d692 | 1202 | { |
1bf5fc34 | 1203 | tinfo_s *ti; |
d689a8f1 | 1204 | tree pseudo_type; |
7267d692 | 1205 | char *pseudo_name; |
4977bab6 | 1206 | tree fields; |
7267d692 | 1207 | tree field_decl; |
e34d07f2 | 1208 | va_list ap; |
7a75edb7 | 1209 | |
1bf5fc34 | 1210 | va_start (ap, real_name); |
7267d692 | 1211 | |
c6002625 | 1212 | /* Generate the pseudo type name. */ |
67f5655f | 1213 | pseudo_name = (char *) alloca (strlen (real_name) + 30); |
7267d692 NS |
1214 | strcpy (pseudo_name, real_name); |
1215 | strcat (pseudo_name, "_pseudo"); | |
1bf5fc34 NS |
1216 | if (tk >= TK_FIXED) |
1217 | sprintf (pseudo_name + strlen (pseudo_name), "%d", tk - TK_FIXED); | |
c8094d83 | 1218 | |
c6002625 | 1219 | /* First field is the pseudo type_info base class. */ |
c2255bc4 AH |
1220 | fields = build_decl (input_location, |
1221 | FIELD_DECL, NULL_TREE, | |
9771b263 | 1222 | (*tinfo_descs)[TK_TYPE_INFO_TYPE].type); |
c8094d83 | 1223 | |
7267d692 | 1224 | /* Now add the derived fields. */ |
4977bab6 ZW |
1225 | while ((field_decl = va_arg (ap, tree))) |
1226 | { | |
910ad8de | 1227 | DECL_CHAIN (field_decl) = fields; |
4977bab6 ZW |
1228 | fields = field_decl; |
1229 | } | |
c8094d83 | 1230 | |
c6002625 | 1231 | /* Create the pseudo type. */ |
9e1e64ec | 1232 | pseudo_type = make_class_type (RECORD_TYPE); |
4977bab6 | 1233 | finish_builtin_struct (pseudo_type, pseudo_name, fields, NULL_TREE); |
8e3df2de | 1234 | CLASSTYPE_AS_BASE (pseudo_type) = pseudo_type; |
7a75edb7 | 1235 | |
9771b263 | 1236 | ti = &(*tinfo_descs)[tk]; |
1bf5fc34 NS |
1237 | ti->type = cp_build_qualified_type (pseudo_type, TYPE_QUAL_CONST); |
1238 | ti->name = get_identifier (real_name); | |
1239 | ti->vtable = NULL_TREE; | |
c8094d83 | 1240 | |
b9e75696 JM |
1241 | /* Pretend this is public so determine_visibility doesn't give vtables |
1242 | internal linkage. */ | |
1243 | TREE_PUBLIC (TYPE_MAIN_DECL (ti->type)) = 1; | |
1244 | ||
e34d07f2 | 1245 | va_end (ap); |
7267d692 NS |
1246 | } |
1247 | ||
1bf5fc34 NS |
1248 | /* Return the index of a pseudo type info type node used to describe |
1249 | TYPE. TYPE must be a complete type (or cv void), except at the end | |
1250 | of the translation unit. */ | |
7267d692 | 1251 | |
1bf5fc34 NS |
1252 | static unsigned |
1253 | get_pseudo_ti_index (tree type) | |
7267d692 | 1254 | { |
1bf5fc34 | 1255 | unsigned ix; |
3db45ab5 | 1256 | |
d689a8f1 | 1257 | switch (TREE_CODE (type)) |
7267d692 | 1258 | { |
a5ac359a | 1259 | case OFFSET_TYPE: |
1bf5fc34 NS |
1260 | ix = TK_POINTER_MEMBER_TYPE; |
1261 | break; | |
3db45ab5 | 1262 | |
d689a8f1 | 1263 | case POINTER_TYPE: |
1bf5fc34 NS |
1264 | ix = TK_POINTER_TYPE; |
1265 | break; | |
3db45ab5 | 1266 | |
d689a8f1 | 1267 | case ENUMERAL_TYPE: |
1bf5fc34 NS |
1268 | ix = TK_ENUMERAL_TYPE; |
1269 | break; | |
3db45ab5 | 1270 | |
d689a8f1 | 1271 | case FUNCTION_TYPE: |
1bf5fc34 NS |
1272 | ix = TK_FUNCTION_TYPE; |
1273 | break; | |
3db45ab5 | 1274 | |
d689a8f1 | 1275 | case ARRAY_TYPE: |
1bf5fc34 NS |
1276 | ix = TK_ARRAY_TYPE; |
1277 | break; | |
3db45ab5 | 1278 | |
d689a8f1 NS |
1279 | case UNION_TYPE: |
1280 | case RECORD_TYPE: | |
1281 | if (TYPE_PTRMEMFUNC_P (type)) | |
1bf5fc34 NS |
1282 | { |
1283 | ix = TK_POINTER_MEMBER_TYPE; | |
1284 | break; | |
1285 | } | |
d689a8f1 NS |
1286 | else if (!COMPLETE_TYPE_P (type)) |
1287 | { | |
5aa3396c JM |
1288 | if (!at_eof) |
1289 | cxx_incomplete_type_error (NULL_TREE, type); | |
1bf5fc34 NS |
1290 | ix = TK_CLASS_TYPE; |
1291 | break; | |
d689a8f1 | 1292 | } |
604a3205 | 1293 | else if (!BINFO_N_BASE_BINFOS (TYPE_BINFO (type))) |
1bf5fc34 NS |
1294 | { |
1295 | ix = TK_CLASS_TYPE; | |
1296 | break; | |
1297 | } | |
d689a8f1 NS |
1298 | else |
1299 | { | |
dbbf88d1 | 1300 | tree binfo = TYPE_BINFO (type); |
9771b263 | 1301 | vec<tree, va_gc> *base_accesses = BINFO_BASE_ACCESSES (binfo); |
fa743e8c NS |
1302 | tree base_binfo = BINFO_BASE_BINFO (binfo, 0); |
1303 | int num_bases = BINFO_N_BASE_BINFOS (binfo); | |
c8094d83 | 1304 | |
d689a8f1 | 1305 | if (num_bases == 1 |
9771b263 | 1306 | && (*base_accesses)[0] == access_public_node |
809e3e7f | 1307 | && !BINFO_VIRTUAL_P (base_binfo) |
d689a8f1 | 1308 | && integer_zerop (BINFO_OFFSET (base_binfo))) |
1bf5fc34 NS |
1309 | { |
1310 | /* single non-virtual public. */ | |
1311 | ix = TK_SI_CLASS_TYPE; | |
1312 | break; | |
1313 | } | |
d689a8f1 NS |
1314 | else |
1315 | { | |
1bf5fc34 | 1316 | tinfo_s *ti; |
d689a8f1 | 1317 | tree array_domain, base_array; |
c8094d83 | 1318 | |
1bf5fc34 | 1319 | ix = TK_FIXED + num_bases; |
9771b263 | 1320 | if (vec_safe_length (tinfo_descs) <= ix) |
d689a8f1 | 1321 | { |
1bf5fc34 | 1322 | /* too short, extend. */ |
9771b263 | 1323 | unsigned len = vec_safe_length (tinfo_descs); |
3db45ab5 | 1324 | |
9771b263 DN |
1325 | vec_safe_grow (tinfo_descs, ix + 1); |
1326 | while (tinfo_descs->iterate (len++, &ti)) | |
1bf5fc34 | 1327 | ti->type = ti->vtable = ti->name = NULL_TREE; |
d689a8f1 | 1328 | } |
9771b263 | 1329 | else if ((*tinfo_descs)[ix].type) |
1bf5fc34 NS |
1330 | /* already created. */ |
1331 | break; | |
c8094d83 | 1332 | |
5dae1114 MM |
1333 | /* Create the array of __base_class_type_info entries. |
1334 | G++ 3.2 allocated an array that had one too many | |
1335 | entries, and then filled that extra entries with | |
1336 | zeros. */ | |
1337 | if (abi_version_at_least (2)) | |
1338 | array_domain = build_index_type (size_int (num_bases - 1)); | |
1339 | else | |
1340 | array_domain = build_index_type (size_int (num_bases)); | |
9771b263 DN |
1341 | base_array = build_array_type ((*tinfo_descs)[TK_BASE_TYPE].type, |
1342 | array_domain); | |
d689a8f1 | 1343 | |
a15f0fd0 | 1344 | push_abi_namespace (); |
1bf5fc34 NS |
1345 | create_pseudo_type_info |
1346 | (ix, "__vmi_class_type_info", | |
c2255bc4 AH |
1347 | build_decl (input_location, |
1348 | FIELD_DECL, NULL_TREE, integer_type_node), | |
1349 | build_decl (input_location, | |
1350 | FIELD_DECL, NULL_TREE, integer_type_node), | |
1351 | build_decl (input_location, | |
1352 | FIELD_DECL, NULL_TREE, base_array), | |
d689a8f1 | 1353 | NULL); |
a15f0fd0 | 1354 | pop_abi_namespace (); |
1bf5fc34 | 1355 | break; |
d689a8f1 NS |
1356 | } |
1357 | } | |
1358 | default: | |
1bf5fc34 NS |
1359 | ix = TK_BUILTIN_TYPE; |
1360 | break; | |
d689a8f1 | 1361 | } |
1bf5fc34 | 1362 | return ix; |
7267d692 NS |
1363 | } |
1364 | ||
1365 | /* Make sure the required builtin types exist for generating the type_info | |
a692ad2e | 1366 | variable definitions. */ |
7267d692 NS |
1367 | |
1368 | static void | |
848eed92 | 1369 | create_tinfo_types (void) |
7267d692 | 1370 | { |
1bf5fc34 | 1371 | tinfo_s *ti; |
3db45ab5 | 1372 | |
1bf5fc34 | 1373 | gcc_assert (!tinfo_descs); |
7267d692 | 1374 | |
9771b263 | 1375 | vec_safe_grow (tinfo_descs, TK_FIXED); |
3db45ab5 | 1376 | |
a15f0fd0 | 1377 | push_abi_namespace (); |
c8094d83 | 1378 | |
7267d692 NS |
1379 | /* Create the internal type_info structure. This is used as a base for |
1380 | the other structures. */ | |
1381 | { | |
4977bab6 | 1382 | tree field, fields; |
7267d692 | 1383 | |
c2255bc4 AH |
1384 | field = build_decl (BUILTINS_LOCATION, |
1385 | FIELD_DECL, NULL_TREE, const_ptr_type_node); | |
4977bab6 | 1386 | fields = field; |
c8094d83 | 1387 | |
c2255bc4 AH |
1388 | field = build_decl (BUILTINS_LOCATION, |
1389 | FIELD_DECL, NULL_TREE, const_string_type_node); | |
910ad8de | 1390 | DECL_CHAIN (field) = fields; |
4977bab6 | 1391 | fields = field; |
c8094d83 | 1392 | |
9771b263 | 1393 | ti = &(*tinfo_descs)[TK_TYPE_INFO_TYPE]; |
9e1e64ec | 1394 | ti->type = make_class_type (RECORD_TYPE); |
1bf5fc34 NS |
1395 | ti->vtable = NULL_TREE; |
1396 | ti->name = NULL_TREE; | |
1397 | finish_builtin_struct (ti->type, "__type_info_pseudo", | |
4977bab6 | 1398 | fields, NULL_TREE); |
7267d692 | 1399 | } |
c8094d83 | 1400 | |
7267d692 | 1401 | /* Fundamental type_info */ |
1bf5fc34 | 1402 | create_pseudo_type_info (TK_BUILTIN_TYPE, "__fundamental_type_info", NULL); |
7267d692 | 1403 | |
c6002625 | 1404 | /* Array, function and enum type_info. No additional fields. */ |
1bf5fc34 NS |
1405 | create_pseudo_type_info (TK_ARRAY_TYPE, "__array_type_info", NULL); |
1406 | create_pseudo_type_info (TK_FUNCTION_TYPE, "__function_type_info", NULL); | |
1407 | create_pseudo_type_info (TK_ENUMERAL_TYPE, "__enum_type_info", NULL); | |
3db45ab5 | 1408 | |
1bf5fc34 NS |
1409 | /* Class type_info. No additional fields. */ |
1410 | create_pseudo_type_info (TK_CLASS_TYPE, "__class_type_info", NULL); | |
3db45ab5 MS |
1411 | |
1412 | /* Single public non-virtual base class. Add pointer to base class. | |
6d61f400 | 1413 | This is really a descendant of __class_type_info. */ |
1bf5fc34 | 1414 | create_pseudo_type_info (TK_SI_CLASS_TYPE, "__si_class_type_info", |
c2255bc4 AH |
1415 | build_decl (BUILTINS_LOCATION, |
1416 | FIELD_DECL, NULL_TREE, type_info_ptr_type), | |
3db45ab5 | 1417 | NULL); |
c8094d83 | 1418 | |
7267d692 | 1419 | /* Base class internal helper. Pointer to base type, offset to base, |
c6002625 | 1420 | flags. */ |
7267d692 | 1421 | { |
4977bab6 | 1422 | tree field, fields; |
c8094d83 | 1423 | |
c2255bc4 AH |
1424 | field = build_decl (BUILTINS_LOCATION, |
1425 | FIELD_DECL, NULL_TREE, type_info_ptr_type); | |
4977bab6 | 1426 | fields = field; |
c8094d83 | 1427 | |
c2255bc4 | 1428 | field = build_decl (BUILTINS_LOCATION, |
1c773c7a | 1429 | FIELD_DECL, NULL_TREE, LONGPTR_T); |
910ad8de | 1430 | DECL_CHAIN (field) = fields; |
4977bab6 | 1431 | fields = field; |
3db45ab5 | 1432 | |
9771b263 | 1433 | ti = &(*tinfo_descs)[TK_BASE_TYPE]; |
3db45ab5 | 1434 | |
9e1e64ec | 1435 | ti->type = make_class_type (RECORD_TYPE); |
1bf5fc34 NS |
1436 | ti->vtable = NULL_TREE; |
1437 | ti->name = NULL_TREE; | |
1438 | finish_builtin_struct (ti->type, "__base_class_type_info_pseudo", | |
4977bab6 | 1439 | fields, NULL_TREE); |
7267d692 | 1440 | } |
c8094d83 | 1441 | |
387769ed NS |
1442 | /* Pointer type_info. Adds two fields, qualification mask |
1443 | and pointer to the pointed to type. This is really a descendant of | |
c6002625 | 1444 | __pbase_type_info. */ |
1bf5fc34 | 1445 | create_pseudo_type_info (TK_POINTER_TYPE, "__pointer_type_info", |
c2255bc4 AH |
1446 | build_decl (BUILTINS_LOCATION, |
1447 | FIELD_DECL, NULL_TREE, integer_type_node), | |
1448 | build_decl (BUILTINS_LOCATION, | |
1449 | FIELD_DECL, NULL_TREE, type_info_ptr_type), | |
387769ed NS |
1450 | NULL); |
1451 | ||
6d61f400 NS |
1452 | /* Pointer to member data type_info. Add qualifications flags, |
1453 | pointer to the member's type info and pointer to the class. | |
387769ed | 1454 | This is really a descendant of __pbase_type_info. */ |
1bf5fc34 NS |
1455 | create_pseudo_type_info (TK_POINTER_MEMBER_TYPE, |
1456 | "__pointer_to_member_type_info", | |
c2255bc4 AH |
1457 | build_decl (BUILTINS_LOCATION, |
1458 | FIELD_DECL, NULL_TREE, integer_type_node), | |
1459 | build_decl (BUILTINS_LOCATION, | |
1460 | FIELD_DECL, NULL_TREE, type_info_ptr_type), | |
1461 | build_decl (BUILTINS_LOCATION, | |
1462 | FIELD_DECL, NULL_TREE, type_info_ptr_type), | |
3db45ab5 | 1463 | NULL); |
7267d692 | 1464 | |
a15f0fd0 | 1465 | pop_abi_namespace (); |
7267d692 NS |
1466 | } |
1467 | ||
1468 | /* Emit the type_info descriptors which are guaranteed to be in the runtime | |
1469 | support. Generating them here guarantees consistency with the other | |
1470 | structures. We use the following heuristic to determine when the runtime | |
7f54a851 | 1471 | is being generated. If std::__fundamental_type_info is defined, and its |
7267d692 NS |
1472 | destructor is defined, then the runtime is being built. */ |
1473 | ||
1474 | void | |
848eed92 | 1475 | emit_support_tinfos (void) |
7267d692 | 1476 | { |
14c2101d JM |
1477 | /* Dummy static variable so we can put nullptr in the array; it will be |
1478 | set before we actually start to walk the array. */ | |
7267d692 NS |
1479 | static tree *const fundamentals[] = |
1480 | { | |
1481 | &void_type_node, | |
1482 | &boolean_type_node, | |
c466b2cd | 1483 | &wchar_type_node, &char16_type_node, &char32_type_node, |
7267d692 NS |
1484 | &char_type_node, &signed_char_type_node, &unsigned_char_type_node, |
1485 | &short_integer_type_node, &short_unsigned_type_node, | |
1486 | &integer_type_node, &unsigned_type_node, | |
1487 | &long_integer_type_node, &long_unsigned_type_node, | |
1488 | &long_long_integer_type_node, &long_long_unsigned_type_node, | |
a6766312 | 1489 | &int128_integer_type_node, &int128_unsigned_type_node, |
7267d692 | 1490 | &float_type_node, &double_type_node, &long_double_type_node, |
fae927d3 | 1491 | &dfloat32_type_node, &dfloat64_type_node, &dfloat128_type_node, |
14c2101d | 1492 | &nullptr_type_node, |
7267d692 NS |
1493 | 0 |
1494 | }; | |
1495 | int ix; | |
1496 | tree bltn_type, dtor; | |
c8094d83 | 1497 | |
a15f0fd0 | 1498 | push_abi_namespace (); |
88e5899c | 1499 | bltn_type = xref_tag (class_type, |
c8094d83 | 1500 | get_identifier ("__fundamental_type_info"), |
bd3d082e | 1501 | /*tag_scope=*/ts_current, false); |
a15f0fd0 | 1502 | pop_abi_namespace (); |
d0f062fb | 1503 | if (!COMPLETE_TYPE_P (bltn_type)) |
7267d692 | 1504 | return; |
aaaa46d2 | 1505 | dtor = CLASSTYPE_DESTRUCTORS (bltn_type); |
9f4faeae | 1506 | if (!dtor || DECL_EXTERNAL (dtor)) |
7267d692 NS |
1507 | return; |
1508 | doing_runtime = 1; | |
1509 | for (ix = 0; fundamentals[ix]; ix++) | |
1510 | { | |
1511 | tree bltn = *fundamentals[ix]; | |
5e001b48 | 1512 | tree types[3]; |
dfb5c523 MM |
1513 | int i; |
1514 | ||
64c31785 KT |
1515 | if (bltn == NULL_TREE) |
1516 | continue; | |
5e001b48 MM |
1517 | types[0] = bltn; |
1518 | types[1] = build_pointer_type (bltn); | |
a3360e77 JM |
1519 | types[2] = build_pointer_type (cp_build_qualified_type (bltn, |
1520 | TYPE_QUAL_CONST)); | |
c8094d83 | 1521 | |
dfb5c523 MM |
1522 | for (i = 0; i < 3; ++i) |
1523 | { | |
1524 | tree tinfo; | |
5e001b48 | 1525 | |
dfb5c523 MM |
1526 | tinfo = get_tinfo_decl (types[i]); |
1527 | TREE_USED (tinfo) = 1; | |
1528 | mark_needed (tinfo); | |
1529 | /* The C++ ABI requires that these objects be COMDAT. But, | |
c8094d83 | 1530 | On systems without weak symbols, initialized COMDAT |
dfb5c523 MM |
1531 | objects are emitted with internal linkage. (See |
1532 | comdat_linkage for details.) Since we want these objects | |
1533 | to have external linkage so that copies do not have to be | |
1534 | emitted in code outside the runtime library, we make them | |
157600d0 GK |
1535 | non-COMDAT here. |
1536 | ||
1537 | It might also not be necessary to follow this detail of the | |
1538 | ABI. */ | |
1539 | if (!flag_weak || ! targetm.cxx.library_rtti_comdat ()) | |
dfb5c523 MM |
1540 | { |
1541 | gcc_assert (TREE_PUBLIC (tinfo) && !DECL_COMDAT (tinfo)); | |
1542 | DECL_INTERFACE_KNOWN (tinfo) = 1; | |
1543 | } | |
1544 | } | |
7267d692 NS |
1545 | } |
1546 | } | |
1547 | ||
d689a8f1 NS |
1548 | /* Finish a type info decl. DECL_PTR is a pointer to an unemitted |
1549 | tinfo decl. Determine whether it needs emitting, and if so | |
1550 | generate the initializer. */ | |
7267d692 | 1551 | |
848eed92 | 1552 | bool |
a260bce6 | 1553 | emit_tinfo_decl (tree decl) |
7267d692 | 1554 | { |
d689a8f1 | 1555 | tree type = TREE_TYPE (DECL_NAME (decl)); |
c6f553d1 | 1556 | int in_library = typeinfo_in_lib_p (type); |
a260bce6 | 1557 | |
c8094d83 MS |
1558 | gcc_assert (DECL_TINFO_P (decl)); |
1559 | ||
4684cd27 MM |
1560 | if (in_library) |
1561 | { | |
1562 | if (doing_runtime) | |
1563 | DECL_EXTERNAL (decl) = 0; | |
1564 | else | |
1565 | { | |
1566 | /* If we're not in the runtime, then DECL (which is already | |
1567 | DECL_EXTERNAL) will not be defined here. */ | |
1568 | DECL_INTERFACE_KNOWN (decl) = 1; | |
1569 | return false; | |
1570 | } | |
1571 | } | |
1572 | else if (involves_incomplete_p (type)) | |
1573 | { | |
1574 | if (!decl_needed_p (decl)) | |
1575 | return false; | |
1576 | /* If TYPE involves an incomplete class type, then the typeinfo | |
1577 | object will be emitted with internal linkage. There is no | |
1578 | way to know whether or not types are incomplete until the end | |
1579 | of the compilation, so this determination must be deferred | |
1580 | until this point. */ | |
1581 | TREE_PUBLIC (decl) = 0; | |
1582 | DECL_EXTERNAL (decl) = 0; | |
1583 | DECL_INTERFACE_KNOWN (decl) = 1; | |
1584 | } | |
ff48be5c | 1585 | |
4684cd27 MM |
1586 | import_export_decl (decl); |
1587 | if (DECL_NOT_REALLY_EXTERN (decl) && decl_needed_p (decl)) | |
1588 | { | |
1bf5fc34 | 1589 | tree init; |
3db45ab5 | 1590 | |
4684cd27 | 1591 | DECL_EXTERNAL (decl) = 0; |
1bf5fc34 NS |
1592 | init = get_pseudo_ti_init (type, get_pseudo_ti_index (type)); |
1593 | DECL_INITIAL (decl) = init; | |
4684cd27 | 1594 | mark_used (decl); |
3600f678 | 1595 | cp_finish_decl (decl, init, false, NULL_TREE, 0); |
4684cd27 MM |
1596 | return true; |
1597 | } | |
1598 | else | |
848eed92 | 1599 | return false; |
7267d692 | 1600 | } |
1bf5fc34 NS |
1601 | |
1602 | #include "gt-cp-rtti.h" |