]>
Commit | Line | Data |
---|---|---|
c244687e | 1 | /* RunTime Type Identification |
f7ef2277 | 2 | Copyright (C) 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, |
62206d34 | 3 | 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012 |
902de8ed | 4 | Free Software Foundation, Inc. |
3a8c5440 | 5 | Mostly written by Jason Merrill (jason@cygnus.com). |
c244687e | 6 | |
6f0d25a6 | 7 | This file is part of GCC. |
c244687e | 8 | |
6f0d25a6 | 9 | GCC is free software; you can redistribute it and/or modify |
c244687e | 10 | it under the terms of the GNU General Public License as published by |
aa139c3f | 11 | the Free Software Foundation; either version 3, or (at your option) |
c244687e | 12 | any later version. |
13 | ||
6f0d25a6 | 14 | GCC is distributed in the hope that it will be useful, |
c244687e | 15 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
16 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | GNU General Public License for more details. | |
18 | ||
19 | You should have received a copy of the GNU General Public License | |
aa139c3f | 20 | along with GCC; see the file COPYING3. If not see |
21 | <http://www.gnu.org/licenses/>. */ | |
c244687e | 22 | |
c244687e | 23 | #include "config.h" |
b3ef7553 | 24 | #include "system.h" |
5c892d4a | 25 | #include "intl.h" |
805e22b2 | 26 | #include "coretypes.h" |
27 | #include "tm.h" | |
c244687e | 28 | #include "tree.h" |
29 | #include "cp-tree.h" | |
30 | #include "flags.h" | |
ee1ab431 | 31 | #include "convert.h" |
60d9461b | 32 | #include "target.h" |
7bedc3a0 | 33 | #include "c-family/c-pragma.h" |
3cc0b4b9 | 34 | |
46f41950 | 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 | ||
c208c18e | 64 | /* Auxiliary data we hold for each type_info derived object we need. */ |
fb1e4f4a | 65 | typedef struct GTY (()) tinfo_s { |
c208c18e | 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 | ||
75 | DEF_VEC_O(tinfo_s); | |
76 | DEF_VEC_ALLOC_O(tinfo_s,gc); | |
77 | ||
78 | typedef enum tinfo_kind | |
79 | { | |
c782ab19 | 80 | TK_TYPE_INFO_TYPE, /* abi::__type_info_pseudo */ |
c208c18e | 81 | TK_BASE_TYPE, /* abi::__base_class_type_info */ |
82 | TK_BUILTIN_TYPE, /* abi::__fundamental_type_info */ | |
83 | TK_ARRAY_TYPE, /* abi::__array_type_info */ | |
84 | TK_FUNCTION_TYPE, /* abi::__function_type_info */ | |
85 | TK_ENUMERAL_TYPE, /* abi::__enum_type_info */ | |
86 | TK_POINTER_TYPE, /* abi::__pointer_type_info */ | |
87 | TK_POINTER_MEMBER_TYPE, /* abi::__pointer_to_member_type_info */ | |
88 | TK_CLASS_TYPE, /* abi::__class_type_info */ | |
89 | TK_SI_CLASS_TYPE, /* abi::__si_class_type_info */ | |
074ab442 | 90 | TK_FIXED /* end of fixed descriptors. */ |
91 | /* ... abi::__vmi_type_info<I> */ | |
c208c18e | 92 | } tinfo_kind; |
c244687e | 93 | |
2beb8f09 | 94 | /* A vector of all tinfo decls that haven't yet been emitted. */ |
046bfc77 | 95 | VEC(tree,gc) *unemitted_tinfo_decls; |
981bab5c | 96 | |
c208c18e | 97 | /* A vector of all type_info derived types we need. The first few are |
98 | fixed and created early. The remainder are for multiple inheritance | |
99 | and are generated as needed. */ | |
100 | static GTY (()) VEC(tinfo_s,gc) *tinfo_descs; | |
101 | ||
749beb82 | 102 | static tree ifnonnull (tree, tree); |
ec46af50 | 103 | static tree tinfo_name (tree, bool); |
ebd21de4 | 104 | static tree build_dynamic_cast_1 (tree, tree, tsubst_flags_t); |
749beb82 | 105 | static tree throw_bad_cast (void); |
106 | static tree throw_bad_typeid (void); | |
107 | static tree get_tinfo_decl_dynamic (tree); | |
108 | static tree get_tinfo_ptr (tree); | |
109 | static bool typeid_ok_p (void); | |
110 | static int qualifier_flags (tree); | |
26ac6687 | 111 | static bool target_incomplete_p (tree); |
c208c18e | 112 | static tree tinfo_base_init (tinfo_s *, tree); |
113 | static tree generic_initializer (tinfo_s *, tree); | |
114 | static tree ptr_initializer (tinfo_s *, tree); | |
115 | static tree ptm_initializer (tinfo_s *, tree); | |
fd1164d3 | 116 | static tree class_initializer (tinfo_s *, tree, unsigned, ...); |
70b44d38 | 117 | static void create_pseudo_type_info (int, const char *, ...); |
c208c18e | 118 | static tree get_pseudo_ti_init (tree, unsigned); |
119 | static unsigned get_pseudo_ti_index (tree); | |
749beb82 | 120 | static void create_tinfo_types (void); |
26ac6687 | 121 | static bool typeinfo_in_lib_p (tree); |
6d318c49 | 122 | |
123 | static int doing_runtime = 0; | |
c244687e | 124 | \f |
9af93fe5 | 125 | static void |
126 | push_abi_namespace (void) | |
127 | { | |
128 | push_nested_namespace (abi_node); | |
f1658ae0 | 129 | push_visibility ("default", 2); |
9af93fe5 | 130 | } |
131 | ||
132 | static void | |
133 | pop_abi_namespace (void) | |
134 | { | |
f1658ae0 | 135 | pop_visibility (2); |
9af93fe5 | 136 | pop_nested_namespace (abi_node); |
137 | } | |
46f41950 | 138 | |
139 | /* Declare language defined type_info type and a pointer to const | |
140 | type_info. This is incomplete here, and will be completed when | |
141 | the user #includes <typeinfo>. There are language defined | |
142 | restrictions on what can be done until that is included. Create | |
143 | the internal versions of the ABI types. */ | |
144 | ||
3a8c5440 | 145 | void |
26ac6687 | 146 | init_rtti_processing (void) |
3a8c5440 | 147 | { |
729f89ff | 148 | tree type_info_type; |
9031d10b | 149 | |
eaf45f93 | 150 | push_namespace (std_identifier); |
729f89ff | 151 | type_info_type = xref_tag (class_type, get_identifier ("type_info"), |
3f3fa556 | 152 | /*tag_scope=*/ts_current, false); |
eaf45f93 | 153 | pop_namespace (); |
729f89ff | 154 | const_type_info_type_node |
ce494fcf | 155 | = cp_build_qualified_type (type_info_type, TYPE_QUAL_CONST); |
729f89ff | 156 | type_info_ptr_type = build_pointer_type (const_type_info_type_node); |
46f41950 | 157 | |
046bfc77 | 158 | unemitted_tinfo_decls = VEC_alloc (tree, gc, 124); |
9031d10b | 159 | |
46f41950 | 160 | create_tinfo_types (); |
3a8c5440 | 161 | } |
162 | ||
3a8c5440 | 163 | /* Given the expression EXP of type `class *', return the head of the |
164 | object pointed to by EXP with type cv void*, if the class has any | |
1d6228f0 | 165 | virtual functions (TYPE_POLYMORPHIC_P), else just return the |
3a8c5440 | 166 | expression. */ |
96624a9e | 167 | |
56a58a8c | 168 | tree |
26ac6687 | 169 | build_headof (tree exp) |
c244687e | 170 | { |
171 | tree type = TREE_TYPE (exp); | |
1adc02a5 | 172 | tree offset; |
5d634e85 | 173 | tree index; |
c244687e | 174 | |
b4df430b | 175 | gcc_assert (TREE_CODE (type) == POINTER_TYPE); |
c244687e | 176 | type = TREE_TYPE (type); |
177 | ||
1d6228f0 | 178 | if (!TYPE_POLYMORPHIC_P (type)) |
c244687e | 179 | return exp; |
180 | ||
3a8c5440 | 181 | /* We use this a couple of times below, protect it. */ |
182 | exp = save_expr (exp); | |
183 | ||
5ad590ad | 184 | /* The offset-to-top field is at index -2 from the vptr. */ |
7c446c95 | 185 | index = build_int_cst (NULL_TREE, |
7016c612 | 186 | -2 * TARGET_VTABLE_DATA_ENTRY_DISTANCE); |
5d634e85 | 187 | |
f08923b3 | 188 | offset = build_vtbl_ref (cp_build_indirect_ref (exp, RO_NULL, |
ebd21de4 | 189 | tf_warning_or_error), |
190 | index); | |
c244687e | 191 | |
ce494fcf | 192 | type = cp_build_qualified_type (ptr_type_node, |
193 | cp_type_quals (TREE_TYPE (exp))); | |
2cc66f2a | 194 | return fold_build_pointer_plus (exp, offset); |
c244687e | 195 | } |
3cc0b4b9 | 196 | |
3cc0b4b9 | 197 | /* Get a bad_cast node for the program to throw... |
198 | ||
199 | See libstdc++/exception.cc for __throw_bad_cast */ | |
200 | ||
201 | static tree | |
26ac6687 | 202 | throw_bad_cast (void) |
3cc0b4b9 | 203 | { |
606b494c | 204 | tree fn = get_identifier ("__cxa_bad_cast"); |
df2c7ecb | 205 | if (!get_global_value_if_present (fn, &fn)) |
fb83f216 | 206 | fn = push_throw_library_fn (fn, build_function_type_list (ptr_type_node, |
207 | NULL_TREE)); | |
9031d10b | 208 | |
d01f58f9 | 209 | return build_cxx_call (fn, 0, NULL); |
3cc0b4b9 | 210 | } |
211 | ||
b3c48b5d | 212 | /* Return an expression for "__cxa_bad_typeid()". The expression |
213 | returned is an lvalue of type "const std::type_info". */ | |
214 | ||
3cc0b4b9 | 215 | static tree |
26ac6687 | 216 | throw_bad_typeid (void) |
3cc0b4b9 | 217 | { |
606b494c | 218 | tree fn = get_identifier ("__cxa_bad_typeid"); |
df2c7ecb | 219 | if (!get_global_value_if_present (fn, &fn)) |
93d6541c | 220 | { |
729f89ff | 221 | tree t; |
222 | ||
223 | t = build_reference_type (const_type_info_type_node); | |
fb83f216 | 224 | t = build_function_type_list (t, NULL_TREE); |
93d6541c | 225 | fn = push_throw_library_fn (fn, t); |
226 | } | |
71792355 | 227 | |
d01f58f9 | 228 | return build_cxx_call (fn, 0, NULL); |
3cc0b4b9 | 229 | } |
c244687e | 230 | \f |
b3c48b5d | 231 | /* Return an lvalue expression whose type is "const std::type_info" |
232 | and whose value indicates the type of the expression EXP. If EXP | |
233 | is a reference to a polymorphic class, return the dynamic type; | |
3cc0b4b9 | 234 | otherwise return the static type of the expression. */ |
96624a9e | 235 | |
f469fd15 | 236 | static tree |
26ac6687 | 237 | get_tinfo_decl_dynamic (tree exp) |
c244687e | 238 | { |
239 | tree type; | |
b3c48b5d | 240 | tree t; |
9031d10b | 241 | |
44bad7e7 | 242 | if (error_operand_p (exp)) |
c244687e | 243 | return error_mark_node; |
244 | ||
c5d33fc0 | 245 | exp = resolve_nondeduced_context (exp); |
246 | ||
96624a9e | 247 | /* peel back references, so they match. */ |
ef4534a3 | 248 | type = non_reference (TREE_TYPE (exp)); |
c244687e | 249 | |
96624a9e | 250 | /* Peel off cv qualifiers. */ |
c244687e | 251 | type = TYPE_MAIN_VARIANT (type); |
9031d10b | 252 | |
9898c6b2 | 253 | /* For UNKNOWN_TYPEs call complete_type_or_else to get diagnostics. */ |
4fdaf896 | 254 | if (CLASS_TYPE_P (type) || type == unknown_type_node |
255 | || type == init_list_type_node) | |
f469fd15 | 256 | type = complete_type_or_else (type, exp); |
9031d10b | 257 | |
f469fd15 | 258 | if (!type) |
259 | return error_mark_node; | |
be295d1f | 260 | |
c244687e | 261 | /* If exp is a reference to polymorphic type, get the real type_info. */ |
1d6228f0 | 262 | if (TYPE_POLYMORPHIC_P (type) && ! resolves_to_fixed_type_p (exp, 0)) |
c244687e | 263 | { |
264 | /* build reference to type_info from vtable. */ | |
5d634e85 | 265 | tree index; |
c244687e | 266 | |
1631c87f | 267 | /* The RTTI information is at index -1. */ |
7c446c95 | 268 | index = build_int_cst (NULL_TREE, |
7016c612 | 269 | -1 * TARGET_VTABLE_DATA_ENTRY_DISTANCE); |
815e356d | 270 | t = build_vtbl_ref (exp, index); |
4ee9c684 | 271 | t = convert (type_info_ptr_type, t); |
c244687e | 272 | } |
b3c48b5d | 273 | else |
274 | /* Otherwise return the type_info for the static type of the expr. */ | |
275 | t = get_tinfo_ptr (TYPE_MAIN_VARIANT (type)); | |
c244687e | 276 | |
f08923b3 | 277 | return cp_build_indirect_ref (t, RO_NULL, tf_warning_or_error); |
3cc0b4b9 | 278 | } |
279 | ||
aaf2d6f6 | 280 | static bool |
26ac6687 | 281 | typeid_ok_p (void) |
3cc0b4b9 | 282 | { |
c782ab19 | 283 | tree pseudo_type_info, type_info_type; |
284 | ||
dcff6334 | 285 | if (! flag_rtti) |
286 | { | |
287 | error ("cannot use typeid with -fno-rtti"); | |
aaf2d6f6 | 288 | return false; |
dcff6334 | 289 | } |
9031d10b | 290 | |
729f89ff | 291 | if (!COMPLETE_TYPE_P (const_type_info_type_node)) |
be295d1f | 292 | { |
293 | error ("must #include <typeinfo> before using typeid"); | |
aaf2d6f6 | 294 | return false; |
be295d1f | 295 | } |
9031d10b | 296 | |
c782ab19 | 297 | pseudo_type_info |
298 | = VEC_index (tinfo_s, tinfo_descs, TK_TYPE_INFO_TYPE)->type; | |
299 | type_info_type = TYPE_MAIN_VARIANT (const_type_info_type_node); | |
300 | ||
301 | /* Make sure abi::__type_info_pseudo has the same alias set | |
302 | as std::type_info. */ | |
303 | if (! TYPE_ALIAS_SET_KNOWN_P (pseudo_type_info)) | |
304 | TYPE_ALIAS_SET (pseudo_type_info) = get_alias_set (type_info_type); | |
305 | else | |
306 | gcc_assert (TYPE_ALIAS_SET (pseudo_type_info) | |
307 | == get_alias_set (type_info_type)); | |
308 | ||
aaf2d6f6 | 309 | return true; |
310 | } | |
311 | ||
b3c48b5d | 312 | /* Return an expression for "typeid(EXP)". The expression returned is |
313 | an lvalue of type "const std::type_info". */ | |
314 | ||
aaf2d6f6 | 315 | tree |
26ac6687 | 316 | build_typeid (tree exp) |
aaf2d6f6 | 317 | { |
fbb73d9b | 318 | tree cond = NULL_TREE, initial_expr = exp; |
aaf2d6f6 | 319 | int nonnull = 0; |
320 | ||
321 | if (exp == error_mark_node || !typeid_ok_p ()) | |
322 | return error_mark_node; | |
323 | ||
3cc0b4b9 | 324 | if (processing_template_decl) |
729f89ff | 325 | return build_min (TYPEID_EXPR, const_type_info_type_node, exp); |
3cc0b4b9 | 326 | |
ce984e5e | 327 | /* FIXME when integrating with c_fully_fold, mark |
328 | resolves_to_fixed_type_p case as a non-constant expression. */ | |
3cc0b4b9 | 329 | if (TREE_CODE (exp) == INDIRECT_REF |
330 | && TREE_CODE (TREE_TYPE (TREE_OPERAND (exp, 0))) == POINTER_TYPE | |
1d6228f0 | 331 | && TYPE_POLYMORPHIC_P (TREE_TYPE (exp)) |
3cc0b4b9 | 332 | && ! resolves_to_fixed_type_p (exp, &nonnull) |
333 | && ! nonnull) | |
334 | { | |
fbb73d9b | 335 | /* So we need to look into the vtable of the type of exp. |
336 | This is an lvalue use of expr then. */ | |
337 | exp = mark_lvalue_use (exp); | |
3cc0b4b9 | 338 | exp = stabilize_reference (exp); |
c4a8ac95 | 339 | cond = cp_convert (boolean_type_node, TREE_OPERAND (exp, 0)); |
3cc0b4b9 | 340 | } |
341 | ||
f469fd15 | 342 | exp = get_tinfo_decl_dynamic (exp); |
38281c46 | 343 | |
344 | if (exp == error_mark_node) | |
345 | return error_mark_node; | |
346 | ||
3cc0b4b9 | 347 | if (cond) |
348 | { | |
349 | tree bad = throw_bad_typeid (); | |
350 | ||
831d52a2 | 351 | exp = build3 (COND_EXPR, TREE_TYPE (exp), cond, exp, bad); |
3cc0b4b9 | 352 | } |
fbb73d9b | 353 | else |
354 | mark_type_use (initial_expr); | |
3cc0b4b9 | 355 | |
b3c48b5d | 356 | return exp; |
c244687e | 357 | } |
358 | ||
ec46af50 | 359 | /* Generate the NTBS name of a type. If MARK_PRIVATE, put a '*' in front so that |
360 | comparisons will be done by pointer rather than string comparison. */ | |
73a07fbc | 361 | static tree |
ec46af50 | 362 | tinfo_name (tree type, bool mark_private) |
73a07fbc | 363 | { |
98eaf693 | 364 | const char *name; |
ec46af50 | 365 | int length; |
98eaf693 | 366 | tree name_string; |
367 | ||
ec46af50 | 368 | name = mangle_type_string (type); |
369 | length = strlen (name); | |
370 | ||
371 | if (mark_private) | |
372 | { | |
373 | /* Inject '*' at beginning of name to force pointer comparison. */ | |
a561df93 | 374 | char* buf = (char*) XALLOCAVEC (char, length + 2); |
ec46af50 | 375 | buf[0] = '*'; |
a561df93 | 376 | memcpy (buf + 1, name, length + 1); |
377 | name_string = build_string (length + 2, buf); | |
ec46af50 | 378 | } |
379 | else | |
380 | name_string = build_string (length + 1, name); | |
381 | ||
382 | return fix_string_type (name_string); | |
73a07fbc | 383 | } |
384 | ||
46f41950 | 385 | /* Return a VAR_DECL for the internal ABI defined type_info object for |
386 | TYPE. You must arrange that the decl is mark_used, if actually use | |
9031d10b | 387 | it --- decls in vtables are only used if the vtable is output. */ |
73aad9b9 | 388 | |
3a8c5440 | 389 | tree |
26ac6687 | 390 | get_tinfo_decl (tree type) |
3a8c5440 | 391 | { |
38281c46 | 392 | tree name; |
3a8c5440 | 393 | tree d; |
394 | ||
79c835c9 | 395 | if (variably_modified_type_p (type, /*fn=*/NULL_TREE)) |
c5144efa | 396 | { |
03d6ca9e | 397 | error ("cannot create type information for type %qT because " |
79c835c9 | 398 | "it involves types of variable size", |
46f41950 | 399 | type); |
c5144efa | 400 | return error_mark_node; |
401 | } | |
402 | ||
38281c46 | 403 | if (TREE_CODE (type) == METHOD_TYPE) |
404 | type = build_function_type (TREE_TYPE (type), | |
405 | TREE_CHAIN (TYPE_ARG_TYPES (type))); | |
406 | ||
1f37296e | 407 | type = complete_type (type); |
408 | ||
d085a847 | 409 | /* For a class type, the variable is cached in the type node |
410 | itself. */ | |
411 | if (CLASS_TYPE_P (type)) | |
412 | { | |
413 | d = CLASSTYPE_TYPEINFO_VAR (TYPE_MAIN_VARIANT (type)); | |
414 | if (d) | |
415 | return d; | |
416 | } | |
9031d10b | 417 | |
606b494c | 418 | name = mangle_typeinfo_for_type (type); |
442fd60a | 419 | |
6d318c49 | 420 | d = IDENTIFIER_GLOBAL_VALUE (name); |
46f41950 | 421 | if (!d) |
6d318c49 | 422 | { |
70b44d38 | 423 | int ix = get_pseudo_ti_index (type); |
424 | tinfo_s *ti = VEC_index (tinfo_s, tinfo_descs, ix); | |
46f41950 | 425 | |
c208c18e | 426 | d = build_lang_decl (VAR_DECL, name, ti->type); |
caa6fdce | 427 | SET_DECL_ASSEMBLER_NAME (d, name); |
91caa6ca | 428 | /* Remember the type it is for. */ |
429 | TREE_TYPE (name) = type; | |
caa6fdce | 430 | DECL_TINFO_P (d) = 1; |
6d318c49 | 431 | DECL_ARTIFICIAL (d) = 1; |
553acd9c | 432 | DECL_IGNORED_P (d) = 1; |
6d318c49 | 433 | TREE_READONLY (d) = 1; |
434 | TREE_STATIC (d) = 1; | |
caa6fdce | 435 | /* Mark the variable as undefined -- but remember that we can |
436 | define it later if we need to do so. */ | |
6d318c49 | 437 | DECL_EXTERNAL (d) = 1; |
caa6fdce | 438 | DECL_NOT_REALLY_EXTERN (d) = 1; |
50eb3e1a | 439 | set_linkage_according_to_type (type, d); |
440 | ||
441 | d = pushdecl_top_level_and_finish (d, NULL_TREE); | |
91caa6ca | 442 | if (CLASS_TYPE_P (type)) |
443 | CLASSTYPE_TYPEINFO_VAR (TYPE_MAIN_VARIANT (type)) = d; | |
46f41950 | 444 | |
6beb3f76 | 445 | /* Add decl to the global array of tinfo decls. */ |
046bfc77 | 446 | VEC_safe_push (tree, gc, unemitted_tinfo_decls, d); |
6d318c49 | 447 | } |
46f41950 | 448 | |
3a8c5440 | 449 | return d; |
450 | } | |
451 | ||
46f41950 | 452 | /* Return a pointer to a type_info object describing TYPE, suitably |
453 | cast to the language defined type. */ | |
454 | ||
455 | static tree | |
26ac6687 | 456 | get_tinfo_ptr (tree type) |
46f41950 | 457 | { |
b04d4dc3 | 458 | tree decl = get_tinfo_decl (type); |
459 | ||
460 | mark_used (decl); | |
9031d10b | 461 | return build_nop (type_info_ptr_type, |
b04d4dc3 | 462 | build_address (decl)); |
46f41950 | 463 | } |
464 | ||
f469fd15 | 465 | /* Return the type_info object for TYPE. */ |
96624a9e | 466 | |
c244687e | 467 | tree |
26ac6687 | 468 | get_typeid (tree type) |
c244687e | 469 | { |
aaf2d6f6 | 470 | if (type == error_mark_node || !typeid_ok_p ()) |
c244687e | 471 | return error_mark_node; |
9031d10b | 472 | |
d6d05907 | 473 | if (processing_template_decl) |
729f89ff | 474 | return build_min (TYPEID_EXPR, const_type_info_type_node, type); |
d6d05907 | 475 | |
3a8c5440 | 476 | /* If the type of the type-id is a reference type, the result of the |
477 | typeid expression refers to a type_info object representing the | |
478 | referenced type. */ | |
ef4534a3 | 479 | type = non_reference (type); |
c244687e | 480 | |
3a8c5440 | 481 | /* The top-level cv-qualifiers of the lvalue expression or the type-id |
96624a9e | 482 | that is the operand of typeid are always ignored. */ |
3a8c5440 | 483 | type = TYPE_MAIN_VARIANT (type); |
c244687e | 484 | |
9898c6b2 | 485 | /* For UNKNOWN_TYPEs call complete_type_or_else to get diagnostics. */ |
4fdaf896 | 486 | if (CLASS_TYPE_P (type) || type == unknown_type_node |
487 | || type == init_list_type_node) | |
f469fd15 | 488 | type = complete_type_or_else (type, NULL_TREE); |
9031d10b | 489 | |
f469fd15 | 490 | if (!type) |
491 | return error_mark_node; | |
be295d1f | 492 | |
f08923b3 | 493 | return cp_build_indirect_ref (get_tinfo_ptr (type), RO_NULL, |
ebd21de4 | 494 | tf_warning_or_error); |
c244687e | 495 | } |
496 | ||
bccffb3a | 497 | /* Check whether TEST is null before returning RESULT. If TEST is used in |
498 | RESULT, it must have previously had a save_expr applied to it. */ | |
499 | ||
02d7f858 | 500 | static tree |
26ac6687 | 501 | ifnonnull (tree test, tree result) |
bccffb3a | 502 | { |
831d52a2 | 503 | return build3 (COND_EXPR, TREE_TYPE (result), |
9031d10b | 504 | build2 (EQ_EXPR, boolean_type_node, test, |
339ad7ca | 505 | cp_convert (TREE_TYPE (test), nullptr_node)), |
506 | cp_convert (TREE_TYPE (result), nullptr_node), | |
831d52a2 | 507 | result); |
bccffb3a | 508 | } |
509 | ||
c244687e | 510 | /* Execute a dynamic cast, as described in section 5.2.6 of the 9/93 working |
511 | paper. */ | |
3a8c5440 | 512 | |
03db3ebd | 513 | static tree |
ebd21de4 | 514 | build_dynamic_cast_1 (tree type, tree expr, tsubst_flags_t complain) |
c244687e | 515 | { |
516 | enum tree_code tc = TREE_CODE (type); | |
9b569e36 | 517 | tree exprtype; |
3a8c5440 | 518 | tree dcast_fn; |
be295d1f | 519 | tree old_expr = expr; |
201fed6e | 520 | const char *errstr = NULL; |
c244687e | 521 | |
35df6eb4 | 522 | /* Save casted types in the function's used types hash table. */ |
523 | used_types_insert (type); | |
524 | ||
fd056a98 | 525 | /* T shall be a pointer or reference to a complete class type, or |
526 | `pointer to cv void''. */ | |
c244687e | 527 | switch (tc) |
528 | { | |
529 | case POINTER_TYPE: | |
fd056a98 | 530 | if (TREE_CODE (TREE_TYPE (type)) == VOID_TYPE) |
c244687e | 531 | break; |
729f89ff | 532 | /* Fall through. */ |
c244687e | 533 | case REFERENCE_TYPE: |
95397ff9 | 534 | if (! MAYBE_CLASS_TYPE_P (TREE_TYPE (type))) |
fd056a98 | 535 | { |
5c892d4a | 536 | errstr = _("target is not pointer or reference to class"); |
fd056a98 | 537 | goto fail; |
538 | } | |
4b72716d | 539 | if (!COMPLETE_TYPE_P (complete_type (TREE_TYPE (type)))) |
fd056a98 | 540 | { |
5c892d4a | 541 | errstr = _("target is not pointer or reference to complete type"); |
fd056a98 | 542 | goto fail; |
543 | } | |
bae9fce7 | 544 | break; |
fd056a98 | 545 | |
c244687e | 546 | default: |
5c892d4a | 547 | errstr = _("target is not pointer or reference"); |
c244687e | 548 | goto fail; |
549 | } | |
550 | ||
fd056a98 | 551 | if (tc == POINTER_TYPE) |
c244687e | 552 | { |
4405c1ad | 553 | expr = decay_conversion (expr, complain); |
9b569e36 | 554 | exprtype = TREE_TYPE (expr); |
555 | ||
fd056a98 | 556 | /* If T is a pointer type, v shall be an rvalue of a pointer to |
557 | complete class type, and the result is an rvalue of type T. */ | |
558 | ||
fbb73d9b | 559 | expr = mark_rvalue_use (expr); |
560 | ||
fd056a98 | 561 | if (TREE_CODE (exprtype) != POINTER_TYPE) |
562 | { | |
5c892d4a | 563 | errstr = _("source is not a pointer"); |
fd056a98 | 564 | goto fail; |
565 | } | |
95397ff9 | 566 | if (! MAYBE_CLASS_TYPE_P (TREE_TYPE (exprtype))) |
fd056a98 | 567 | { |
5c892d4a | 568 | errstr = _("source is not a pointer to class"); |
fd056a98 | 569 | goto fail; |
570 | } | |
4b72716d | 571 | if (!COMPLETE_TYPE_P (complete_type (TREE_TYPE (exprtype)))) |
fd056a98 | 572 | { |
5c892d4a | 573 | errstr = _("source is a pointer to incomplete type"); |
fd056a98 | 574 | goto fail; |
575 | } | |
576 | } | |
577 | else | |
578 | { | |
fbb73d9b | 579 | expr = mark_lvalue_use (expr); |
580 | ||
9b569e36 | 581 | exprtype = build_reference_type (TREE_TYPE (expr)); |
729f89ff | 582 | |
fd056a98 | 583 | /* T is a reference type, v shall be an lvalue of a complete class |
584 | type, and the result is an lvalue of the type referred to by T. */ | |
585 | ||
95397ff9 | 586 | if (! MAYBE_CLASS_TYPE_P (TREE_TYPE (exprtype))) |
fd056a98 | 587 | { |
5c892d4a | 588 | errstr = _("source is not of class type"); |
fd056a98 | 589 | goto fail; |
590 | } | |
4b72716d | 591 | if (!COMPLETE_TYPE_P (complete_type (TREE_TYPE (exprtype)))) |
fd056a98 | 592 | { |
5c892d4a | 593 | errstr = _("source is of incomplete class type"); |
fd056a98 | 594 | goto fail; |
595 | } | |
9031d10b | 596 | |
ab12ed55 | 597 | /* Apply trivial conversion T -> T& for dereferenced ptrs. */ |
598 | expr = convert_to_reference (exprtype, expr, CONV_IMPLICIT, | |
599 | LOOKUP_NORMAL, NULL_TREE); | |
fd056a98 | 600 | } |
601 | ||
602 | /* The dynamic_cast operator shall not cast away constness. */ | |
603 | if (!at_least_as_qualified_p (TREE_TYPE (type), | |
604 | TREE_TYPE (exprtype))) | |
605 | { | |
5c892d4a | 606 | errstr = _("conversion casts away constness"); |
fd056a98 | 607 | goto fail; |
c244687e | 608 | } |
609 | ||
610 | /* If *type is an unambiguous accessible base class of *exprtype, | |
611 | convert statically. */ | |
612 | { | |
4a2680fc | 613 | tree binfo; |
c244687e | 614 | |
4a2680fc | 615 | binfo = lookup_base (TREE_TYPE (exprtype), TREE_TYPE (type), |
ada40935 | 616 | ba_check, NULL); |
be295d1f | 617 | |
4a2680fc | 618 | if (binfo) |
be295d1f | 619 | { |
4a2680fc | 620 | expr = build_base_path (PLUS_EXPR, convert_from_reference (expr), |
1e74225a | 621 | binfo, 0, complain); |
d9f88785 | 622 | if (TREE_CODE (exprtype) == POINTER_TYPE) |
fcb3f76e | 623 | expr = rvalue (expr); |
d9f88785 | 624 | return expr; |
625 | } | |
c244687e | 626 | } |
627 | ||
628 | /* Otherwise *exprtype must be a polymorphic class (have a vtbl). */ | |
1d6228f0 | 629 | if (TYPE_POLYMORPHIC_P (TREE_TYPE (exprtype))) |
c244687e | 630 | { |
bccffb3a | 631 | tree expr1; |
c244687e | 632 | /* if TYPE is `void *', return pointer to complete object. */ |
e3cfe3ce | 633 | if (tc == POINTER_TYPE && VOID_TYPE_P (TREE_TYPE (type))) |
c244687e | 634 | { |
635 | /* if b is an object, dynamic_cast<void *>(&b) == (void *)&b. */ | |
636 | if (TREE_CODE (expr) == ADDR_EXPR | |
637 | && TREE_CODE (TREE_OPERAND (expr, 0)) == VAR_DECL | |
638 | && TREE_CODE (TREE_TYPE (TREE_OPERAND (expr, 0))) == RECORD_TYPE) | |
639 | return build1 (NOP_EXPR, type, expr); | |
640 | ||
bccffb3a | 641 | /* Since expr is used twice below, save it. */ |
642 | expr = save_expr (expr); | |
643 | ||
644 | expr1 = build_headof (expr); | |
645 | if (TREE_TYPE (expr1) != type) | |
646 | expr1 = build1 (NOP_EXPR, type, expr1); | |
647 | return ifnonnull (expr, expr1); | |
c244687e | 648 | } |
649 | else | |
650 | { | |
651 | tree retval; | |
d01f58f9 | 652 | tree result, td2, td3; |
653 | tree elems[4]; | |
653e5405 | 654 | tree static_type, target_type, boff; |
c244687e | 655 | |
653e5405 | 656 | /* If we got here, we can't convert statically. Therefore, |
c244687e | 657 | dynamic_cast<D&>(b) (b an object) cannot succeed. */ |
fd056a98 | 658 | if (tc == REFERENCE_TYPE) |
c244687e | 659 | { |
be295d1f | 660 | if (TREE_CODE (old_expr) == VAR_DECL |
661 | && TREE_CODE (TREE_TYPE (old_expr)) == RECORD_TYPE) | |
c244687e | 662 | { |
653e5405 | 663 | tree expr = throw_bad_cast (); |
ebd21de4 | 664 | if (complain & tf_warning) |
665 | warning (0, "dynamic_cast of %q#D to %q#T can never succeed", | |
666 | old_expr, type); | |
653e5405 | 667 | /* Bash it to the expected type. */ |
668 | TREE_TYPE (expr) = type; | |
71792355 | 669 | return expr; |
c244687e | 670 | } |
671 | } | |
672 | /* Ditto for dynamic_cast<D*>(&b). */ | |
673 | else if (TREE_CODE (expr) == ADDR_EXPR) | |
674 | { | |
675 | tree op = TREE_OPERAND (expr, 0); | |
676 | if (TREE_CODE (op) == VAR_DECL | |
677 | && TREE_CODE (TREE_TYPE (op)) == RECORD_TYPE) | |
678 | { | |
ebd21de4 | 679 | if (complain & tf_warning) |
680 | warning (0, "dynamic_cast of %q#D to %q#T can never succeed", | |
681 | op, type); | |
9031d10b | 682 | retval = build_int_cst (type, 0); |
c244687e | 683 | return retval; |
684 | } | |
685 | } | |
686 | ||
54864ec6 | 687 | /* Use of dynamic_cast when -fno-rtti is prohibited. */ |
688 | if (!flag_rtti) | |
689 | { | |
ebd21de4 | 690 | if (complain & tf_error) |
691 | error ("%<dynamic_cast%> not permitted with -fno-rtti"); | |
54864ec6 | 692 | return error_mark_node; |
693 | } | |
694 | ||
6d318c49 | 695 | target_type = TYPE_MAIN_VARIANT (TREE_TYPE (type)); |
696 | static_type = TYPE_MAIN_VARIANT (TREE_TYPE (exprtype)); | |
b04d4dc3 | 697 | td2 = get_tinfo_decl (target_type); |
698 | mark_used (td2); | |
d6fbd579 | 699 | td2 = cp_build_addr_expr (td2, complain); |
b04d4dc3 | 700 | td3 = get_tinfo_decl (static_type); |
701 | mark_used (td3); | |
d6fbd579 | 702 | td3 = cp_build_addr_expr (td3, complain); |
6d318c49 | 703 | |
653e5405 | 704 | /* Determine how T and V are related. */ |
705 | boff = dcast_base_hint (static_type, target_type); | |
9031d10b | 706 | |
3a8c5440 | 707 | /* Since expr is used twice below, save it. */ |
708 | expr = save_expr (expr); | |
709 | ||
c244687e | 710 | expr1 = expr; |
711 | if (tc == REFERENCE_TYPE) | |
d6fbd579 | 712 | expr1 = cp_build_addr_expr (expr1, complain); |
c244687e | 713 | |
d01f58f9 | 714 | elems[0] = expr1; |
715 | elems[1] = td3; | |
716 | elems[2] = td2; | |
717 | elems[3] = boff; | |
3a8c5440 | 718 | |
71792355 | 719 | dcast_fn = dynamic_cast_node; |
720 | if (!dcast_fn) | |
3a8c5440 | 721 | { |
722 | tree tmp; | |
6d318c49 | 723 | tree tinfo_ptr; |
6d318c49 | 724 | const char *name; |
9031d10b | 725 | |
9af93fe5 | 726 | push_abi_namespace (); |
160175b4 | 727 | tinfo_ptr = xref_tag (class_type, |
1631c87f | 728 | get_identifier ("__class_type_info"), |
3f3fa556 | 729 | /*tag_scope=*/ts_current, false); |
9031d10b | 730 | |
1631c87f | 731 | tinfo_ptr = build_pointer_type |
ce494fcf | 732 | (cp_build_qualified_type |
1631c87f | 733 | (tinfo_ptr, TYPE_QUAL_CONST)); |
734 | name = "__dynamic_cast"; | |
fb83f216 | 735 | tmp = build_function_type_list (ptr_type_node, |
736 | const_ptr_type_node, | |
737 | tinfo_ptr, tinfo_ptr, | |
738 | ptrdiff_type_node, NULL_TREE); | |
35b7a3f5 | 739 | dcast_fn = build_library_fn_ptr (name, tmp); |
9c2a0c05 | 740 | DECL_PURE_P (dcast_fn) = 1; |
9af93fe5 | 741 | pop_abi_namespace (); |
653e5405 | 742 | dynamic_cast_node = dcast_fn; |
3a8c5440 | 743 | } |
d01f58f9 | 744 | result = build_cxx_call (dcast_fn, 4, elems); |
c244687e | 745 | |
746 | if (tc == REFERENCE_TYPE) | |
747 | { | |
6d318c49 | 748 | tree bad = throw_bad_cast (); |
7565d3e7 | 749 | tree neq; |
9031d10b | 750 | |
c244687e | 751 | result = save_expr (result); |
339ad7ca | 752 | neq = cp_truthvalue_conversion (result); |
448e9bee | 753 | return cp_convert (type, |
754 | build3 (COND_EXPR, TREE_TYPE (result), | |
755 | neq, result, bad)); | |
c244687e | 756 | } |
757 | ||
96624a9e | 758 | /* Now back to the type we want from a void*. */ |
c4a8ac95 | 759 | result = cp_convert (type, result); |
653e5405 | 760 | return ifnonnull (expr, result); |
c244687e | 761 | } |
762 | } | |
fd056a98 | 763 | else |
5c892d4a | 764 | errstr = _("source type is not polymorphic"); |
3d121546 | 765 | |
c244687e | 766 | fail: |
ebd21de4 | 767 | if (complain & tf_error) |
768 | error ("cannot dynamic_cast %qE (of type %q#T) to type %q#T (%s)", | |
9b569e36 | 769 | old_expr, TREE_TYPE (old_expr), type, errstr); |
c244687e | 770 | return error_mark_node; |
771 | } | |
03db3ebd | 772 | |
773 | tree | |
ebd21de4 | 774 | build_dynamic_cast (tree type, tree expr, tsubst_flags_t complain) |
03db3ebd | 775 | { |
62206d34 | 776 | tree r; |
777 | ||
d2e8d7dc | 778 | if (type == error_mark_node || expr == error_mark_node) |
779 | return error_mark_node; | |
9031d10b | 780 | |
d2e8d7dc | 781 | if (processing_template_decl) |
b6691ff5 | 782 | { |
783 | expr = build_min (DYNAMIC_CAST_EXPR, type, expr); | |
784 | TREE_SIDE_EFFECTS (expr) = 1; | |
002dd6c6 | 785 | return convert_from_reference (expr); |
b6691ff5 | 786 | } |
d2e8d7dc | 787 | |
62206d34 | 788 | r = convert_from_reference (build_dynamic_cast_1 (type, expr, complain)); |
789 | if (r != error_mark_node) | |
790 | maybe_warn_about_useless_cast (type, expr, complain); | |
791 | return r; | |
03db3ebd | 792 | } |
62206d34 | 793 | |
6d318c49 | 794 | /* Return the runtime bit mask encoding the qualifiers of TYPE. */ |
795 | ||
796 | static int | |
26ac6687 | 797 | qualifier_flags (tree type) |
6d318c49 | 798 | { |
799 | int flags = 0; | |
b112d873 | 800 | int quals = cp_type_quals (type); |
9031d10b | 801 | |
6d318c49 | 802 | if (quals & TYPE_QUAL_CONST) |
803 | flags |= 1; | |
804 | if (quals & TYPE_QUAL_VOLATILE) | |
805 | flags |= 2; | |
30b54f80 | 806 | if (quals & TYPE_QUAL_RESTRICT) |
807 | flags |= 4; | |
6d318c49 | 808 | return flags; |
809 | } | |
810 | ||
26ac6687 | 811 | /* Return true, if the pointer chain TYPE ends at an incomplete type, or |
bafaec53 | 812 | contains a pointer to member of an incomplete class. */ |
813 | ||
26ac6687 | 814 | static bool |
815 | target_incomplete_p (tree type) | |
bafaec53 | 816 | { |
1bc16cab | 817 | while (true) |
05765a91 | 818 | if (TYPE_PTRDATAMEM_P (type)) |
bafaec53 | 819 | { |
1bc16cab | 820 | if (!COMPLETE_TYPE_P (TYPE_PTRMEM_CLASS_TYPE (type))) |
821 | return true; | |
822 | type = TYPE_PTRMEM_POINTED_TO_TYPE (type); | |
bafaec53 | 823 | } |
1bc16cab | 824 | else if (TREE_CODE (type) == POINTER_TYPE) |
bafaec53 | 825 | type = TREE_TYPE (type); |
1bc16cab | 826 | else |
827 | return !COMPLETE_OR_VOID_TYPE_P (type); | |
bafaec53 | 828 | } |
829 | ||
caa6fdce | 830 | /* Returns true if TYPE involves an incomplete class type; in that |
831 | case, typeinfo variables for TYPE should be emitted with internal | |
832 | linkage. */ | |
833 | ||
834 | static bool | |
835 | involves_incomplete_p (tree type) | |
836 | { | |
837 | switch (TREE_CODE (type)) | |
838 | { | |
839 | case POINTER_TYPE: | |
840 | return target_incomplete_p (TREE_TYPE (type)); | |
841 | ||
842 | case OFFSET_TYPE: | |
843 | ptrmem: | |
9031d10b | 844 | return |
caa6fdce | 845 | (target_incomplete_p (TYPE_PTRMEM_POINTED_TO_TYPE (type)) |
846 | || !COMPLETE_TYPE_P (TYPE_PTRMEM_CLASS_TYPE (type))); | |
847 | ||
848 | case RECORD_TYPE: | |
849 | if (TYPE_PTRMEMFUNC_P (type)) | |
850 | goto ptrmem; | |
851 | /* Fall through. */ | |
852 | case UNION_TYPE: | |
853 | if (!COMPLETE_TYPE_P (type)) | |
854 | return true; | |
855 | ||
856 | default: | |
857 | /* All other types do not involve incomplete class types. */ | |
858 | return false; | |
859 | } | |
860 | } | |
861 | ||
6d318c49 | 862 | /* Return a CONSTRUCTOR for the common part of the type_info objects. This |
bafaec53 | 863 | is the vtable pointer and NTBS name. The NTBS name is emitted as a |
864 | comdat const char array, so it becomes a unique key for the type. Generate | |
865 | and emit that VAR_DECL here. (We can't always emit the type_info itself | |
866 | as comdat, because of pointers to incomplete.) */ | |
6d318c49 | 867 | |
868 | static tree | |
c208c18e | 869 | tinfo_base_init (tinfo_s *ti, tree target) |
6d318c49 | 870 | { |
fd1164d3 | 871 | tree init; |
bafaec53 | 872 | tree name_decl; |
46f41950 | 873 | tree vtable_ptr; |
fd1164d3 | 874 | VEC(constructor_elt,gc) *v; |
9031d10b | 875 | |
bafaec53 | 876 | { |
ec46af50 | 877 | tree name_name, name_string; |
9031d10b | 878 | |
bafaec53 | 879 | /* Generate the NTBS array variable. */ |
bafaec53 | 880 | tree name_type = build_cplus_array_type |
ce494fcf | 881 | (cp_build_qualified_type (char_type_node, TYPE_QUAL_CONST), |
653e5405 | 882 | NULL_TREE); |
98eaf693 | 883 | |
caa6fdce | 884 | /* Determine the name of the variable -- and remember with which |
885 | type it is associated. */ | |
606b494c | 886 | name_name = mangle_typeinfo_string_for_type (target); |
caa6fdce | 887 | TREE_TYPE (name_name) = target; |
888 | ||
bafaec53 | 889 | name_decl = build_lang_decl (VAR_DECL, name_name, name_type); |
91caa6ca | 890 | SET_DECL_ASSEMBLER_NAME (name_decl, name_name); |
bafaec53 | 891 | DECL_ARTIFICIAL (name_decl) = 1; |
553acd9c | 892 | DECL_IGNORED_P (name_decl) = 1; |
bafaec53 | 893 | TREE_READONLY (name_decl) = 1; |
894 | TREE_STATIC (name_decl) = 1; | |
895 | DECL_EXTERNAL (name_decl) = 0; | |
caa6fdce | 896 | DECL_TINFO_P (name_decl) = 1; |
8da875f3 | 897 | set_linkage_according_to_type (target, name_decl); |
caa6fdce | 898 | import_export_decl (name_decl); |
ec46af50 | 899 | name_string = tinfo_name (target, !TREE_PUBLIC (name_decl)); |
bafaec53 | 900 | DECL_INITIAL (name_decl) = name_string; |
b04d4dc3 | 901 | mark_used (name_decl); |
ce0c3b07 | 902 | pushdecl_top_level_and_finish (name_decl, name_string); |
bafaec53 | 903 | } |
46f41950 | 904 | |
c208c18e | 905 | vtable_ptr = ti->vtable; |
46f41950 | 906 | if (!vtable_ptr) |
6d318c49 | 907 | { |
46f41950 | 908 | tree real_type; |
9af93fe5 | 909 | push_abi_namespace (); |
c208c18e | 910 | real_type = xref_tag (class_type, ti->name, |
3f3fa556 | 911 | /*tag_scope=*/ts_current, false); |
9af93fe5 | 912 | pop_abi_namespace (); |
9031d10b | 913 | |
46f41950 | 914 | if (!COMPLETE_TYPE_P (real_type)) |
915 | { | |
653e5405 | 916 | /* We never saw a definition of this type, so we need to |
46f41950 | 917 | tell the compiler that this is an exported class, as |
918 | indeed all of the __*_type_info classes are. */ | |
919 | SET_CLASSTYPE_INTERFACE_KNOWN (real_type); | |
920 | CLASSTYPE_INTERFACE_ONLY (real_type) = 1; | |
921 | } | |
922 | ||
923 | vtable_ptr = get_vtable_decl (real_type, /*complete=*/1); | |
d6fbd579 | 924 | vtable_ptr = cp_build_addr_expr (vtable_ptr, tf_warning_or_error); |
46f41950 | 925 | |
926 | /* We need to point into the middle of the vtable. */ | |
2cc66f2a | 927 | vtable_ptr = fold_build_pointer_plus |
928 | (vtable_ptr, | |
46f41950 | 929 | size_binop (MULT_EXPR, |
930 | size_int (2 * TARGET_VTABLE_DATA_ENTRY_DISTANCE), | |
931 | TYPE_SIZE_UNIT (vtable_entry_type))); | |
074ab442 | 932 | |
c208c18e | 933 | ti->vtable = vtable_ptr; |
6d318c49 | 934 | } |
46f41950 | 935 | |
fd1164d3 | 936 | v = VEC_alloc (constructor_elt, gc, 2); |
937 | CONSTRUCTOR_APPEND_ELT (v, NULL_TREE, vtable_ptr); | |
4405c1ad | 938 | CONSTRUCTOR_APPEND_ELT (v, NULL_TREE, |
939 | decay_conversion (name_decl, tf_warning_or_error)); | |
9031d10b | 940 | |
fd1164d3 | 941 | init = build_constructor (init_list_type_node, v); |
4ee9c684 | 942 | TREE_CONSTANT (init) = 1; |
4ee9c684 | 943 | TREE_STATIC (init) = 1; |
9031d10b | 944 | |
6d318c49 | 945 | return init; |
946 | } | |
947 | ||
c208c18e | 948 | /* Return the CONSTRUCTOR expr for a type_info of TYPE. TI provides the |
6d318c49 | 949 | information about the particular type_info derivation, which adds no |
950 | additional fields to the type_info base. */ | |
951 | ||
952 | static tree | |
c208c18e | 953 | generic_initializer (tinfo_s *ti, tree target) |
6d318c49 | 954 | { |
c208c18e | 955 | tree init = tinfo_base_init (ti, target); |
074ab442 | 956 | |
fd1164d3 | 957 | init = build_constructor_single (init_list_type_node, NULL_TREE, init); |
4ee9c684 | 958 | TREE_CONSTANT (init) = 1; |
4ee9c684 | 959 | TREE_STATIC (init) = 1; |
6d318c49 | 960 | return init; |
961 | } | |
962 | ||
378e5add | 963 | /* Return the CONSTRUCTOR expr for a type_info of pointer TYPE. |
c208c18e | 964 | TI provides information about the particular type_info derivation, |
6d318c49 | 965 | which adds target type and qualifier flags members to the type_info base. */ |
966 | ||
967 | static tree | |
c208c18e | 968 | ptr_initializer (tinfo_s *ti, tree target) |
6d318c49 | 969 | { |
c208c18e | 970 | tree init = tinfo_base_init (ti, target); |
6d318c49 | 971 | tree to = TREE_TYPE (target); |
972 | int flags = qualifier_flags (to); | |
26ac6687 | 973 | bool incomplete = target_incomplete_p (to); |
fd1164d3 | 974 | VEC(constructor_elt,gc) *v = VEC_alloc (constructor_elt, gc, 3); |
9031d10b | 975 | |
bafaec53 | 976 | if (incomplete) |
caa6fdce | 977 | flags |= 8; |
fd1164d3 | 978 | CONSTRUCTOR_APPEND_ELT (v, NULL_TREE, init); |
979 | CONSTRUCTOR_APPEND_ELT (v, NULL_TREE, build_int_cst (NULL_TREE, flags)); | |
980 | CONSTRUCTOR_APPEND_ELT (v, NULL_TREE, | |
981 | get_tinfo_ptr (TYPE_MAIN_VARIANT (to))); | |
9031d10b | 982 | |
fd1164d3 | 983 | init = build_constructor (init_list_type_node, v); |
4ee9c684 | 984 | TREE_CONSTANT (init) = 1; |
4ee9c684 | 985 | TREE_STATIC (init) = 1; |
6d318c49 | 986 | return init; |
987 | } | |
988 | ||
378e5add | 989 | /* Return the CONSTRUCTOR expr for a type_info of pointer to member data TYPE. |
c208c18e | 990 | TI provides information about the particular type_info derivation, |
bafaec53 | 991 | which adds class, target type and qualifier flags members to the type_info |
992 | base. */ | |
6d318c49 | 993 | |
994 | static tree | |
c208c18e | 995 | ptm_initializer (tinfo_s *ti, tree target) |
6d318c49 | 996 | { |
c208c18e | 997 | tree init = tinfo_base_init (ti, target); |
6d318c49 | 998 | tree to = TYPE_PTRMEM_POINTED_TO_TYPE (target); |
999 | tree klass = TYPE_PTRMEM_CLASS_TYPE (target); | |
1000 | int flags = qualifier_flags (to); | |
26ac6687 | 1001 | bool incomplete = target_incomplete_p (to); |
fd1164d3 | 1002 | VEC(constructor_elt,gc) *v = VEC_alloc (constructor_elt, gc, 4); |
9031d10b | 1003 | |
bafaec53 | 1004 | if (incomplete) |
caa6fdce | 1005 | flags |= 0x8; |
bafaec53 | 1006 | if (!COMPLETE_TYPE_P (klass)) |
caa6fdce | 1007 | flags |= 0x10; |
fd1164d3 | 1008 | CONSTRUCTOR_APPEND_ELT (v, NULL_TREE, init); |
1009 | CONSTRUCTOR_APPEND_ELT (v, NULL_TREE, build_int_cst (NULL_TREE, flags)); | |
1010 | CONSTRUCTOR_APPEND_ELT (v, NULL_TREE, | |
1011 | get_tinfo_ptr (TYPE_MAIN_VARIANT (to))); | |
1012 | CONSTRUCTOR_APPEND_ELT (v, NULL_TREE, get_tinfo_ptr (klass)); | |
1013 | ||
1014 | init = build_constructor (init_list_type_node, v); | |
4ee9c684 | 1015 | TREE_CONSTANT (init) = 1; |
4ee9c684 | 1016 | TREE_STATIC (init) = 1; |
9031d10b | 1017 | return init; |
6d318c49 | 1018 | } |
1019 | ||
6d318c49 | 1020 | /* Return the CONSTRUCTOR expr for a type_info of class TYPE. |
c208c18e | 1021 | TI provides information about the particular __class_type_info derivation, |
fd1164d3 | 1022 | which adds hint flags and N extra initializers to the type_info base. */ |
6d318c49 | 1023 | |
1024 | static tree | |
fd1164d3 | 1025 | class_initializer (tinfo_s *ti, tree target, unsigned n, ...) |
6d318c49 | 1026 | { |
c208c18e | 1027 | tree init = tinfo_base_init (ti, target); |
fd1164d3 | 1028 | va_list extra_inits; |
1029 | unsigned i; | |
1030 | VEC(constructor_elt,gc) *v = VEC_alloc (constructor_elt, gc, n+1); | |
1031 | ||
1032 | CONSTRUCTOR_APPEND_ELT (v, NULL_TREE, init); | |
1033 | va_start (extra_inits, n); | |
1034 | for (i = 0; i < n; i++) | |
1035 | CONSTRUCTOR_APPEND_ELT (v, NULL_TREE, va_arg (extra_inits, tree)); | |
1036 | va_end (extra_inits); | |
9031d10b | 1037 | |
fd1164d3 | 1038 | init = build_constructor (init_list_type_node, v); |
4ee9c684 | 1039 | TREE_CONSTANT (init) = 1; |
4ee9c684 | 1040 | TREE_STATIC (init) = 1; |
9031d10b | 1041 | return init; |
6d318c49 | 1042 | } |
1043 | ||
26ac6687 | 1044 | /* Returns true if the typeinfo for type should be placed in |
20e29201 | 1045 | the runtime library. */ |
1046 | ||
26ac6687 | 1047 | static bool |
1048 | typeinfo_in_lib_p (tree type) | |
20e29201 | 1049 | { |
1050 | /* The typeinfo objects for `T*' and `const T*' are in the runtime | |
1051 | library for simple types T. */ | |
1052 | if (TREE_CODE (type) == POINTER_TYPE | |
3119c950 | 1053 | && (cp_type_quals (TREE_TYPE (type)) == TYPE_QUAL_CONST |
1054 | || cp_type_quals (TREE_TYPE (type)) == TYPE_UNQUALIFIED)) | |
20e29201 | 1055 | type = TREE_TYPE (type); |
1056 | ||
1057 | switch (TREE_CODE (type)) | |
1058 | { | |
1059 | case INTEGER_TYPE: | |
1060 | case BOOLEAN_TYPE: | |
20e29201 | 1061 | case REAL_TYPE: |
1062 | case VOID_TYPE: | |
fa67d8e8 | 1063 | case NULLPTR_TYPE: |
26ac6687 | 1064 | return true; |
9031d10b | 1065 | |
c7ca48ea | 1066 | case LANG_TYPE: |
fa67d8e8 | 1067 | /* fall through. */ |
c7ca48ea | 1068 | |
20e29201 | 1069 | default: |
26ac6687 | 1070 | return false; |
20e29201 | 1071 | } |
1072 | } | |
1073 | ||
c208c18e | 1074 | /* Generate the initializer for the type info describing TYPE. TK_INDEX is |
1075 | the index of the descriptor in the tinfo_desc vector. */ | |
6d318c49 | 1076 | |
1077 | static tree | |
c208c18e | 1078 | get_pseudo_ti_init (tree type, unsigned tk_index) |
6d318c49 | 1079 | { |
c208c18e | 1080 | tinfo_s *ti = VEC_index (tinfo_s, tinfo_descs, tk_index); |
074ab442 | 1081 | |
b4df430b | 1082 | gcc_assert (at_eof); |
c208c18e | 1083 | switch (tk_index) |
6d318c49 | 1084 | { |
c208c18e | 1085 | case TK_POINTER_MEMBER_TYPE: |
1086 | return ptm_initializer (ti, type); | |
074ab442 | 1087 | |
c208c18e | 1088 | case TK_POINTER_TYPE: |
1089 | return ptr_initializer (ti, type); | |
074ab442 | 1090 | |
c208c18e | 1091 | case TK_BUILTIN_TYPE: |
1092 | case TK_ENUMERAL_TYPE: | |
1093 | case TK_FUNCTION_TYPE: | |
1094 | case TK_ARRAY_TYPE: | |
1095 | return generic_initializer (ti, type); | |
1096 | ||
1097 | case TK_CLASS_TYPE: | |
fd1164d3 | 1098 | return class_initializer (ti, type, 0); |
c208c18e | 1099 | |
1100 | case TK_SI_CLASS_TYPE: | |
1101 | { | |
1102 | tree base_binfo = BINFO_BASE_BINFO (TYPE_BINFO (type), 0); | |
1103 | tree tinfo = get_tinfo_ptr (BINFO_TYPE (base_binfo)); | |
11318ee4 | 1104 | |
1105 | /* get_tinfo_ptr might have reallocated the tinfo_descs vector. */ | |
1106 | ti = VEC_index (tinfo_s, tinfo_descs, tk_index); | |
fd1164d3 | 1107 | return class_initializer (ti, type, 1, tinfo); |
c208c18e | 1108 | } |
20e29201 | 1109 | |
6d318c49 | 1110 | default: |
c208c18e | 1111 | { |
1112 | int hint = ((CLASSTYPE_REPEATED_BASE_P (type) << 0) | |
1113 | | (CLASSTYPE_DIAMOND_SHAPED_P (type) << 1)); | |
1114 | tree binfo = TYPE_BINFO (type); | |
1115 | int nbases = BINFO_N_BASE_BINFOS (binfo); | |
1116 | VEC(tree,gc) *base_accesses = BINFO_BASE_ACCESSES (binfo); | |
00f39591 | 1117 | tree offset_type = integer_types[itk_long]; |
c208c18e | 1118 | tree base_inits = NULL_TREE; |
1119 | int ix; | |
fd1164d3 | 1120 | VEC(constructor_elt,gc) *init_vec = NULL; |
1121 | constructor_elt *e; | |
074ab442 | 1122 | |
c208c18e | 1123 | gcc_assert (tk_index >= TK_FIXED); |
074ab442 | 1124 | |
fd1164d3 | 1125 | VEC_safe_grow (constructor_elt, gc, init_vec, nbases); |
c208c18e | 1126 | /* Generate the base information initializer. */ |
1127 | for (ix = nbases; ix--;) | |
1128 | { | |
1129 | tree base_binfo = BINFO_BASE_BINFO (binfo, ix); | |
fd1164d3 | 1130 | tree base_init; |
c208c18e | 1131 | int flags = 0; |
1132 | tree tinfo; | |
1133 | tree offset; | |
fd1164d3 | 1134 | VEC(constructor_elt,gc) *v; |
074ab442 | 1135 | |
c208c18e | 1136 | if (VEC_index (tree, base_accesses, ix) == access_public_node) |
1137 | flags |= 2; | |
1138 | tinfo = get_tinfo_ptr (BINFO_TYPE (base_binfo)); | |
1139 | if (BINFO_VIRTUAL_P (base_binfo)) | |
1140 | { | |
1141 | /* We store the vtable offset at which the virtual | |
074ab442 | 1142 | base offset can be found. */ |
c208c18e | 1143 | offset = BINFO_VPTR_FIELD (base_binfo); |
c208c18e | 1144 | flags |= 1; |
1145 | } | |
1146 | else | |
1147 | offset = BINFO_OFFSET (base_binfo); | |
074ab442 | 1148 | |
c208c18e | 1149 | /* Combine offset and flags into one field. */ |
00f39591 | 1150 | offset = fold_convert (offset_type, offset); |
389dd41b | 1151 | offset = fold_build2_loc (input_location, |
1152 | LSHIFT_EXPR, offset_type, offset, | |
00f39591 | 1153 | build_int_cst (offset_type, 8)); |
389dd41b | 1154 | offset = fold_build2_loc (input_location, |
1155 | BIT_IOR_EXPR, offset_type, offset, | |
00f39591 | 1156 | build_int_cst (offset_type, flags)); |
fd1164d3 | 1157 | v = VEC_alloc (constructor_elt, gc, 2); |
1158 | CONSTRUCTOR_APPEND_ELT (v, NULL_TREE, tinfo); | |
1159 | CONSTRUCTOR_APPEND_ELT (v, NULL_TREE, offset); | |
1160 | base_init = build_constructor (init_list_type_node, v); | |
1161 | e = VEC_index (constructor_elt, init_vec, ix); | |
1162 | e->index = NULL_TREE; | |
1163 | e->value = base_init; | |
c208c18e | 1164 | } |
fd1164d3 | 1165 | base_inits = build_constructor (init_list_type_node, init_vec); |
11318ee4 | 1166 | |
1167 | /* get_tinfo_ptr might have reallocated the tinfo_descs vector. */ | |
1168 | ti = VEC_index (tinfo_s, tinfo_descs, tk_index); | |
fd1164d3 | 1169 | return class_initializer (ti, type, 3, |
1170 | build_int_cst (NULL_TREE, hint), | |
1171 | build_int_cst (NULL_TREE, nbases), | |
1172 | base_inits); | |
c208c18e | 1173 | } |
6d318c49 | 1174 | } |
6d318c49 | 1175 | } |
1176 | ||
1177 | /* Generate the RECORD_TYPE containing the data layout of a type_info | |
1178 | derivative as used by the runtime. This layout must be consistent with | |
1179 | that defined in the runtime support. Also generate the VAR_DECL for the | |
1180 | type's vtable. We explicitly manage the vtable member, and name it for | |
1181 | real type as used in the runtime. The RECORD type has a different name, | |
1182 | to avoid collisions. Return a TREE_LIST who's TINFO_PSEUDO_TYPE | |
46f41950 | 1183 | is the generated type and TINFO_VTABLE_NAME is the name of the |
1184 | vtable. We have to delay generating the VAR_DECL of the vtable | |
1185 | until the end of the translation, when we'll have seen the library | |
1186 | definition, if there was one. | |
9031d10b | 1187 | |
6d318c49 | 1188 | REAL_NAME is the runtime's name of the type. Trailing arguments are |
1189 | additional FIELD_DECL's for the structure. The final argument must be | |
1190 | NULL. */ | |
1191 | ||
c208c18e | 1192 | static void |
70b44d38 | 1193 | create_pseudo_type_info (int tk, const char *real_name, ...) |
6d318c49 | 1194 | { |
c208c18e | 1195 | tinfo_s *ti; |
46f41950 | 1196 | tree pseudo_type; |
6d318c49 | 1197 | char *pseudo_name; |
805e22b2 | 1198 | tree fields; |
6d318c49 | 1199 | tree field_decl; |
ee582a61 | 1200 | va_list ap; |
0903457a | 1201 | |
c208c18e | 1202 | va_start (ap, real_name); |
6d318c49 | 1203 | |
47cd6605 | 1204 | /* Generate the pseudo type name. */ |
cc52f165 | 1205 | pseudo_name = (char *) alloca (strlen (real_name) + 30); |
6d318c49 | 1206 | strcpy (pseudo_name, real_name); |
1207 | strcat (pseudo_name, "_pseudo"); | |
c208c18e | 1208 | if (tk >= TK_FIXED) |
1209 | sprintf (pseudo_name + strlen (pseudo_name), "%d", tk - TK_FIXED); | |
9031d10b | 1210 | |
47cd6605 | 1211 | /* First field is the pseudo type_info base class. */ |
e60a6f7b | 1212 | fields = build_decl (input_location, |
1213 | FIELD_DECL, NULL_TREE, | |
c208c18e | 1214 | VEC_index (tinfo_s, tinfo_descs, |
1215 | TK_TYPE_INFO_TYPE)->type); | |
9031d10b | 1216 | |
6d318c49 | 1217 | /* Now add the derived fields. */ |
805e22b2 | 1218 | while ((field_decl = va_arg (ap, tree))) |
1219 | { | |
1767a056 | 1220 | DECL_CHAIN (field_decl) = fields; |
805e22b2 | 1221 | fields = field_decl; |
1222 | } | |
9031d10b | 1223 | |
47cd6605 | 1224 | /* Create the pseudo type. */ |
95397ff9 | 1225 | pseudo_type = make_class_type (RECORD_TYPE); |
805e22b2 | 1226 | finish_builtin_struct (pseudo_type, pseudo_name, fields, NULL_TREE); |
2437a99c | 1227 | CLASSTYPE_AS_BASE (pseudo_type) = pseudo_type; |
0903457a | 1228 | |
c208c18e | 1229 | ti = VEC_index (tinfo_s, tinfo_descs, tk); |
1230 | ti->type = cp_build_qualified_type (pseudo_type, TYPE_QUAL_CONST); | |
1231 | ti->name = get_identifier (real_name); | |
1232 | ti->vtable = NULL_TREE; | |
9031d10b | 1233 | |
4a2849cb | 1234 | /* Pretend this is public so determine_visibility doesn't give vtables |
1235 | internal linkage. */ | |
1236 | TREE_PUBLIC (TYPE_MAIN_DECL (ti->type)) = 1; | |
1237 | ||
ee582a61 | 1238 | va_end (ap); |
6d318c49 | 1239 | } |
1240 | ||
c208c18e | 1241 | /* Return the index of a pseudo type info type node used to describe |
1242 | TYPE. TYPE must be a complete type (or cv void), except at the end | |
1243 | of the translation unit. */ | |
6d318c49 | 1244 | |
c208c18e | 1245 | static unsigned |
1246 | get_pseudo_ti_index (tree type) | |
6d318c49 | 1247 | { |
c208c18e | 1248 | unsigned ix; |
074ab442 | 1249 | |
46f41950 | 1250 | switch (TREE_CODE (type)) |
6d318c49 | 1251 | { |
1bc16cab | 1252 | case OFFSET_TYPE: |
c208c18e | 1253 | ix = TK_POINTER_MEMBER_TYPE; |
1254 | break; | |
074ab442 | 1255 | |
46f41950 | 1256 | case POINTER_TYPE: |
c208c18e | 1257 | ix = TK_POINTER_TYPE; |
1258 | break; | |
074ab442 | 1259 | |
46f41950 | 1260 | case ENUMERAL_TYPE: |
c208c18e | 1261 | ix = TK_ENUMERAL_TYPE; |
1262 | break; | |
074ab442 | 1263 | |
46f41950 | 1264 | case FUNCTION_TYPE: |
c208c18e | 1265 | ix = TK_FUNCTION_TYPE; |
1266 | break; | |
074ab442 | 1267 | |
46f41950 | 1268 | case ARRAY_TYPE: |
c208c18e | 1269 | ix = TK_ARRAY_TYPE; |
1270 | break; | |
074ab442 | 1271 | |
46f41950 | 1272 | case UNION_TYPE: |
1273 | case RECORD_TYPE: | |
1274 | if (TYPE_PTRMEMFUNC_P (type)) | |
c208c18e | 1275 | { |
1276 | ix = TK_POINTER_MEMBER_TYPE; | |
1277 | break; | |
1278 | } | |
46f41950 | 1279 | else if (!COMPLETE_TYPE_P (type)) |
1280 | { | |
6fee0737 | 1281 | if (!at_eof) |
1282 | cxx_incomplete_type_error (NULL_TREE, type); | |
c208c18e | 1283 | ix = TK_CLASS_TYPE; |
1284 | break; | |
46f41950 | 1285 | } |
2cfde4f3 | 1286 | else if (!BINFO_N_BASE_BINFOS (TYPE_BINFO (type))) |
c208c18e | 1287 | { |
1288 | ix = TK_CLASS_TYPE; | |
1289 | break; | |
1290 | } | |
46f41950 | 1291 | else |
1292 | { | |
95f3173a | 1293 | tree binfo = TYPE_BINFO (type); |
046bfc77 | 1294 | VEC(tree,gc) *base_accesses = BINFO_BASE_ACCESSES (binfo); |
f6cc6a08 | 1295 | tree base_binfo = BINFO_BASE_BINFO (binfo, 0); |
1296 | int num_bases = BINFO_N_BASE_BINFOS (binfo); | |
9031d10b | 1297 | |
46f41950 | 1298 | if (num_bases == 1 |
db77fe17 | 1299 | && VEC_index (tree, base_accesses, 0) == access_public_node |
57c28194 | 1300 | && !BINFO_VIRTUAL_P (base_binfo) |
46f41950 | 1301 | && integer_zerop (BINFO_OFFSET (base_binfo))) |
c208c18e | 1302 | { |
1303 | /* single non-virtual public. */ | |
1304 | ix = TK_SI_CLASS_TYPE; | |
1305 | break; | |
1306 | } | |
46f41950 | 1307 | else |
1308 | { | |
c208c18e | 1309 | tinfo_s *ti; |
46f41950 | 1310 | tree array_domain, base_array; |
9031d10b | 1311 | |
c208c18e | 1312 | ix = TK_FIXED + num_bases; |
1313 | if (VEC_length (tinfo_s, tinfo_descs) <= ix) | |
46f41950 | 1314 | { |
c208c18e | 1315 | /* too short, extend. */ |
1316 | unsigned len = VEC_length (tinfo_s, tinfo_descs); | |
074ab442 | 1317 | |
c208c18e | 1318 | VEC_safe_grow (tinfo_s, gc, tinfo_descs, ix + 1); |
1319 | while (VEC_iterate (tinfo_s, tinfo_descs, len++, ti)) | |
1320 | ti->type = ti->vtable = ti->name = NULL_TREE; | |
46f41950 | 1321 | } |
c208c18e | 1322 | else if (VEC_index (tinfo_s, tinfo_descs, ix)->type) |
1323 | /* already created. */ | |
1324 | break; | |
9031d10b | 1325 | |
8c1f65e6 | 1326 | /* Create the array of __base_class_type_info entries. |
1327 | G++ 3.2 allocated an array that had one too many | |
1328 | entries, and then filled that extra entries with | |
1329 | zeros. */ | |
1330 | if (abi_version_at_least (2)) | |
1331 | array_domain = build_index_type (size_int (num_bases - 1)); | |
1332 | else | |
1333 | array_domain = build_index_type (size_int (num_bases)); | |
46f41950 | 1334 | base_array = |
c208c18e | 1335 | build_array_type (VEC_index (tinfo_s, tinfo_descs, |
1336 | TK_BASE_TYPE)->type, | |
1337 | array_domain); | |
46f41950 | 1338 | |
9af93fe5 | 1339 | push_abi_namespace (); |
c208c18e | 1340 | create_pseudo_type_info |
1341 | (ix, "__vmi_class_type_info", | |
e60a6f7b | 1342 | build_decl (input_location, |
1343 | FIELD_DECL, NULL_TREE, integer_type_node), | |
1344 | build_decl (input_location, | |
1345 | FIELD_DECL, NULL_TREE, integer_type_node), | |
1346 | build_decl (input_location, | |
1347 | FIELD_DECL, NULL_TREE, base_array), | |
46f41950 | 1348 | NULL); |
9af93fe5 | 1349 | pop_abi_namespace (); |
c208c18e | 1350 | break; |
46f41950 | 1351 | } |
1352 | } | |
1353 | default: | |
c208c18e | 1354 | ix = TK_BUILTIN_TYPE; |
1355 | break; | |
46f41950 | 1356 | } |
c208c18e | 1357 | return ix; |
6d318c49 | 1358 | } |
1359 | ||
1360 | /* Make sure the required builtin types exist for generating the type_info | |
f5f73833 | 1361 | variable definitions. */ |
6d318c49 | 1362 | |
1363 | static void | |
26ac6687 | 1364 | create_tinfo_types (void) |
6d318c49 | 1365 | { |
c208c18e | 1366 | tinfo_s *ti; |
074ab442 | 1367 | |
c208c18e | 1368 | gcc_assert (!tinfo_descs); |
6d318c49 | 1369 | |
c208c18e | 1370 | VEC_safe_grow (tinfo_s, gc, tinfo_descs, TK_FIXED); |
074ab442 | 1371 | |
9af93fe5 | 1372 | push_abi_namespace (); |
9031d10b | 1373 | |
6d318c49 | 1374 | /* Create the internal type_info structure. This is used as a base for |
1375 | the other structures. */ | |
1376 | { | |
805e22b2 | 1377 | tree field, fields; |
6d318c49 | 1378 | |
e60a6f7b | 1379 | field = build_decl (BUILTINS_LOCATION, |
1380 | FIELD_DECL, NULL_TREE, const_ptr_type_node); | |
805e22b2 | 1381 | fields = field; |
9031d10b | 1382 | |
e60a6f7b | 1383 | field = build_decl (BUILTINS_LOCATION, |
1384 | FIELD_DECL, NULL_TREE, const_string_type_node); | |
1767a056 | 1385 | DECL_CHAIN (field) = fields; |
805e22b2 | 1386 | fields = field; |
9031d10b | 1387 | |
c208c18e | 1388 | ti = VEC_index (tinfo_s, tinfo_descs, TK_TYPE_INFO_TYPE); |
95397ff9 | 1389 | ti->type = make_class_type (RECORD_TYPE); |
c208c18e | 1390 | ti->vtable = NULL_TREE; |
1391 | ti->name = NULL_TREE; | |
1392 | finish_builtin_struct (ti->type, "__type_info_pseudo", | |
805e22b2 | 1393 | fields, NULL_TREE); |
6d318c49 | 1394 | } |
9031d10b | 1395 | |
6d318c49 | 1396 | /* Fundamental type_info */ |
c208c18e | 1397 | create_pseudo_type_info (TK_BUILTIN_TYPE, "__fundamental_type_info", NULL); |
6d318c49 | 1398 | |
47cd6605 | 1399 | /* Array, function and enum type_info. No additional fields. */ |
c208c18e | 1400 | create_pseudo_type_info (TK_ARRAY_TYPE, "__array_type_info", NULL); |
1401 | create_pseudo_type_info (TK_FUNCTION_TYPE, "__function_type_info", NULL); | |
1402 | create_pseudo_type_info (TK_ENUMERAL_TYPE, "__enum_type_info", NULL); | |
074ab442 | 1403 | |
c208c18e | 1404 | /* Class type_info. No additional fields. */ |
1405 | create_pseudo_type_info (TK_CLASS_TYPE, "__class_type_info", NULL); | |
074ab442 | 1406 | |
1407 | /* Single public non-virtual base class. Add pointer to base class. | |
30b54f80 | 1408 | This is really a descendant of __class_type_info. */ |
c208c18e | 1409 | create_pseudo_type_info (TK_SI_CLASS_TYPE, "__si_class_type_info", |
e60a6f7b | 1410 | build_decl (BUILTINS_LOCATION, |
1411 | FIELD_DECL, NULL_TREE, type_info_ptr_type), | |
074ab442 | 1412 | NULL); |
9031d10b | 1413 | |
6d318c49 | 1414 | /* Base class internal helper. Pointer to base type, offset to base, |
47cd6605 | 1415 | flags. */ |
6d318c49 | 1416 | { |
805e22b2 | 1417 | tree field, fields; |
9031d10b | 1418 | |
e60a6f7b | 1419 | field = build_decl (BUILTINS_LOCATION, |
1420 | FIELD_DECL, NULL_TREE, type_info_ptr_type); | |
805e22b2 | 1421 | fields = field; |
9031d10b | 1422 | |
e60a6f7b | 1423 | field = build_decl (BUILTINS_LOCATION, |
1424 | FIELD_DECL, NULL_TREE, integer_types[itk_long]); | |
1767a056 | 1425 | DECL_CHAIN (field) = fields; |
805e22b2 | 1426 | fields = field; |
074ab442 | 1427 | |
c208c18e | 1428 | ti = VEC_index (tinfo_s, tinfo_descs, TK_BASE_TYPE); |
074ab442 | 1429 | |
95397ff9 | 1430 | ti->type = make_class_type (RECORD_TYPE); |
c208c18e | 1431 | ti->vtable = NULL_TREE; |
1432 | ti->name = NULL_TREE; | |
1433 | finish_builtin_struct (ti->type, "__base_class_type_info_pseudo", | |
805e22b2 | 1434 | fields, NULL_TREE); |
6d318c49 | 1435 | } |
9031d10b | 1436 | |
15acd583 | 1437 | /* Pointer type_info. Adds two fields, qualification mask |
1438 | and pointer to the pointed to type. This is really a descendant of | |
47cd6605 | 1439 | __pbase_type_info. */ |
c208c18e | 1440 | create_pseudo_type_info (TK_POINTER_TYPE, "__pointer_type_info", |
e60a6f7b | 1441 | build_decl (BUILTINS_LOCATION, |
1442 | FIELD_DECL, NULL_TREE, integer_type_node), | |
1443 | build_decl (BUILTINS_LOCATION, | |
1444 | FIELD_DECL, NULL_TREE, type_info_ptr_type), | |
15acd583 | 1445 | NULL); |
1446 | ||
30b54f80 | 1447 | /* Pointer to member data type_info. Add qualifications flags, |
1448 | pointer to the member's type info and pointer to the class. | |
15acd583 | 1449 | This is really a descendant of __pbase_type_info. */ |
c208c18e | 1450 | create_pseudo_type_info (TK_POINTER_MEMBER_TYPE, |
1451 | "__pointer_to_member_type_info", | |
e60a6f7b | 1452 | build_decl (BUILTINS_LOCATION, |
1453 | FIELD_DECL, NULL_TREE, integer_type_node), | |
1454 | build_decl (BUILTINS_LOCATION, | |
1455 | FIELD_DECL, NULL_TREE, type_info_ptr_type), | |
1456 | build_decl (BUILTINS_LOCATION, | |
1457 | FIELD_DECL, NULL_TREE, type_info_ptr_type), | |
074ab442 | 1458 | NULL); |
6d318c49 | 1459 | |
9af93fe5 | 1460 | pop_abi_namespace (); |
6d318c49 | 1461 | } |
1462 | ||
1463 | /* Emit the type_info descriptors which are guaranteed to be in the runtime | |
1464 | support. Generating them here guarantees consistency with the other | |
1465 | structures. We use the following heuristic to determine when the runtime | |
aaf2d6f6 | 1466 | is being generated. If std::__fundamental_type_info is defined, and its |
6d318c49 | 1467 | destructor is defined, then the runtime is being built. */ |
1468 | ||
1469 | void | |
26ac6687 | 1470 | emit_support_tinfos (void) |
6d318c49 | 1471 | { |
6fe11077 | 1472 | /* Dummy static variable so we can put nullptr in the array; it will be |
1473 | set before we actually start to walk the array. */ | |
6d318c49 | 1474 | static tree *const fundamentals[] = |
1475 | { | |
1476 | &void_type_node, | |
1477 | &boolean_type_node, | |
b0726616 | 1478 | &wchar_type_node, &char16_type_node, &char32_type_node, |
6d318c49 | 1479 | &char_type_node, &signed_char_type_node, &unsigned_char_type_node, |
1480 | &short_integer_type_node, &short_unsigned_type_node, | |
1481 | &integer_type_node, &unsigned_type_node, | |
1482 | &long_integer_type_node, &long_unsigned_type_node, | |
1483 | &long_long_integer_type_node, &long_long_unsigned_type_node, | |
6388cfe2 | 1484 | &int128_integer_type_node, &int128_unsigned_type_node, |
6d318c49 | 1485 | &float_type_node, &double_type_node, &long_double_type_node, |
b7f26334 | 1486 | &dfloat32_type_node, &dfloat64_type_node, &dfloat128_type_node, |
6fe11077 | 1487 | &nullptr_type_node, |
6d318c49 | 1488 | 0 |
1489 | }; | |
1490 | int ix; | |
1491 | tree bltn_type, dtor; | |
9031d10b | 1492 | |
9af93fe5 | 1493 | push_abi_namespace (); |
160175b4 | 1494 | bltn_type = xref_tag (class_type, |
9031d10b | 1495 | get_identifier ("__fundamental_type_info"), |
3f3fa556 | 1496 | /*tag_scope=*/ts_current, false); |
9af93fe5 | 1497 | pop_abi_namespace (); |
4b72716d | 1498 | if (!COMPLETE_TYPE_P (bltn_type)) |
6d318c49 | 1499 | return; |
de5ab3f1 | 1500 | dtor = CLASSTYPE_DESTRUCTORS (bltn_type); |
ed36f1cf | 1501 | if (!dtor || DECL_EXTERNAL (dtor)) |
6d318c49 | 1502 | return; |
1503 | doing_runtime = 1; | |
1504 | for (ix = 0; fundamentals[ix]; ix++) | |
1505 | { | |
1506 | tree bltn = *fundamentals[ix]; | |
f1b37438 | 1507 | tree types[3]; |
1fe46df1 | 1508 | int i; |
1509 | ||
890d0caa | 1510 | if (bltn == NULL_TREE) |
1511 | continue; | |
f1b37438 | 1512 | types[0] = bltn; |
1513 | types[1] = build_pointer_type (bltn); | |
ce494fcf | 1514 | types[2] = build_pointer_type (cp_build_qualified_type (bltn, |
1515 | TYPE_QUAL_CONST)); | |
9031d10b | 1516 | |
1fe46df1 | 1517 | for (i = 0; i < 3; ++i) |
1518 | { | |
1519 | tree tinfo; | |
f1b37438 | 1520 | |
1fe46df1 | 1521 | tinfo = get_tinfo_decl (types[i]); |
1522 | TREE_USED (tinfo) = 1; | |
1523 | mark_needed (tinfo); | |
1524 | /* The C++ ABI requires that these objects be COMDAT. But, | |
9031d10b | 1525 | On systems without weak symbols, initialized COMDAT |
1fe46df1 | 1526 | objects are emitted with internal linkage. (See |
1527 | comdat_linkage for details.) Since we want these objects | |
1528 | to have external linkage so that copies do not have to be | |
1529 | emitted in code outside the runtime library, we make them | |
60d9461b | 1530 | non-COMDAT here. |
1531 | ||
1532 | It might also not be necessary to follow this detail of the | |
1533 | ABI. */ | |
1534 | if (!flag_weak || ! targetm.cxx.library_rtti_comdat ()) | |
1fe46df1 | 1535 | { |
1536 | gcc_assert (TREE_PUBLIC (tinfo) && !DECL_COMDAT (tinfo)); | |
1537 | DECL_INTERFACE_KNOWN (tinfo) = 1; | |
1538 | } | |
1539 | } | |
6d318c49 | 1540 | } |
1541 | } | |
1542 | ||
46f41950 | 1543 | /* Finish a type info decl. DECL_PTR is a pointer to an unemitted |
1544 | tinfo decl. Determine whether it needs emitting, and if so | |
1545 | generate the initializer. */ | |
6d318c49 | 1546 | |
26ac6687 | 1547 | bool |
981bab5c | 1548 | emit_tinfo_decl (tree decl) |
6d318c49 | 1549 | { |
46f41950 | 1550 | tree type = TREE_TYPE (DECL_NAME (decl)); |
6a7638c9 | 1551 | int in_library = typeinfo_in_lib_p (type); |
981bab5c | 1552 | |
9031d10b | 1553 | gcc_assert (DECL_TINFO_P (decl)); |
1554 | ||
caa6fdce | 1555 | if (in_library) |
1556 | { | |
1557 | if (doing_runtime) | |
1558 | DECL_EXTERNAL (decl) = 0; | |
1559 | else | |
1560 | { | |
1561 | /* If we're not in the runtime, then DECL (which is already | |
1562 | DECL_EXTERNAL) will not be defined here. */ | |
1563 | DECL_INTERFACE_KNOWN (decl) = 1; | |
1564 | return false; | |
1565 | } | |
1566 | } | |
1567 | else if (involves_incomplete_p (type)) | |
1568 | { | |
1569 | if (!decl_needed_p (decl)) | |
1570 | return false; | |
1571 | /* If TYPE involves an incomplete class type, then the typeinfo | |
1572 | object will be emitted with internal linkage. There is no | |
1573 | way to know whether or not types are incomplete until the end | |
1574 | of the compilation, so this determination must be deferred | |
1575 | until this point. */ | |
1576 | TREE_PUBLIC (decl) = 0; | |
1577 | DECL_EXTERNAL (decl) = 0; | |
1578 | DECL_INTERFACE_KNOWN (decl) = 1; | |
1579 | } | |
277f8387 | 1580 | |
caa6fdce | 1581 | import_export_decl (decl); |
1582 | if (DECL_NOT_REALLY_EXTERN (decl) && decl_needed_p (decl)) | |
1583 | { | |
c208c18e | 1584 | tree init; |
074ab442 | 1585 | |
caa6fdce | 1586 | DECL_EXTERNAL (decl) = 0; |
c208c18e | 1587 | init = get_pseudo_ti_init (type, get_pseudo_ti_index (type)); |
1588 | DECL_INITIAL (decl) = init; | |
caa6fdce | 1589 | mark_used (decl); |
7f78414b | 1590 | cp_finish_decl (decl, init, false, NULL_TREE, 0); |
caa6fdce | 1591 | return true; |
1592 | } | |
1593 | else | |
26ac6687 | 1594 | return false; |
6d318c49 | 1595 | } |
c208c18e | 1596 | |
1597 | #include "gt-cp-rtti.h" |