Line data Source code
1 : /* Functions related to building -*- C++ -*- classes and their related objects.
2 : Copyright (C) 1987-2026 Free Software Foundation, Inc.
3 : Contributed by Michael Tiemann (tiemann@cygnus.com)
4 :
5 : This file is part of GCC.
6 :
7 : GCC is free software; you can redistribute it and/or modify
8 : it under the terms of the GNU General Public License as published by
9 : the Free Software Foundation; either version 3, or (at your option)
10 : any later version.
11 :
12 : GCC is distributed in the hope that it will be useful,
13 : but WITHOUT ANY WARRANTY; without even the implied warranty of
14 : MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 : GNU General Public License for more details.
16 :
17 : You should have received a copy of the GNU General Public License
18 : along with GCC; see the file COPYING3. If not see
19 : <http://www.gnu.org/licenses/>. */
20 :
21 :
22 : /* High-level class interface. */
23 :
24 : #include "config.h"
25 : #include "system.h"
26 : #include "coretypes.h"
27 : #include "target.h"
28 : #include "cp-tree.h"
29 : #include "stringpool.h"
30 : #include "cgraph.h"
31 : #include "stor-layout.h"
32 : #include "attribs.h"
33 : #include "flags.h"
34 : #include "toplev.h"
35 : #include "convert.h"
36 : #include "dumpfile.h"
37 : #include "gimplify.h"
38 : #include "intl.h"
39 : #include "asan.h"
40 : #include "contracts.h"
41 :
42 : /* Id for dumping the class hierarchy. */
43 : int class_dump_id;
44 :
45 : /* The number of nested classes being processed. If we are not in the
46 : scope of any class, this is zero. */
47 :
48 : int current_class_depth;
49 :
50 : /* In order to deal with nested classes, we keep a stack of classes.
51 : The topmost entry is the innermost class, and is the entry at index
52 : CURRENT_CLASS_DEPTH */
53 :
54 : typedef struct class_stack_node {
55 : /* The name of the class. */
56 : tree name;
57 :
58 : /* The _TYPE node for the class. */
59 : tree type;
60 :
61 : /* The access specifier pending for new declarations in the scope of
62 : this class. */
63 : tree access;
64 :
65 : /* If were defining TYPE, the names used in this class. */
66 : splay_tree names_used;
67 :
68 : /* Nonzero if this class is no longer open, because of a call to
69 : push_to_top_level. */
70 : size_t hidden;
71 : }* class_stack_node_t;
72 :
73 : struct vtbl_init_data
74 : {
75 : /* The base for which we're building initializers. */
76 : tree binfo;
77 : /* The type of the most-derived type. */
78 : tree derived;
79 : /* The binfo for the dynamic type. This will be TYPE_BINFO (derived),
80 : unless ctor_vtbl_p is true. */
81 : tree rtti_binfo;
82 : /* The negative-index vtable initializers built up so far. These
83 : are in order from least negative index to most negative index. */
84 : vec<constructor_elt, va_gc> *inits;
85 : /* The binfo for the virtual base for which we're building
86 : vcall offset initializers. */
87 : tree vbase;
88 : /* The functions in vbase for which we have already provided vcall
89 : offsets. */
90 : vec<tree, va_gc> *fns;
91 : /* The vtable index of the next vcall or vbase offset. */
92 : tree index;
93 : /* Nonzero if we are building the initializer for the primary
94 : vtable. */
95 : int primary_vtbl_p;
96 : /* Nonzero if we are building the initializer for a construction
97 : vtable. */
98 : int ctor_vtbl_p;
99 : /* True when adding vcall offset entries to the vtable. False when
100 : merely computing the indices. */
101 : bool generate_vcall_entries;
102 : };
103 :
104 : /* The type of a function passed to walk_subobject_offsets. */
105 : typedef int (*subobject_offset_fn) (tree, tree, splay_tree);
106 :
107 : /* The stack itself. This is a dynamically resized array. The
108 : number of elements allocated is CURRENT_CLASS_STACK_SIZE. */
109 : static int current_class_stack_size;
110 : static class_stack_node_t current_class_stack;
111 :
112 : /* The size of the largest empty class seen in this translation unit. */
113 : static GTY (()) tree sizeof_biggest_empty_class;
114 :
115 : static tree get_vfield_name (tree);
116 : static void finish_struct_anon (tree);
117 : static tree get_vtable_name (tree);
118 : static void get_basefndecls (tree, tree, vec<tree> *);
119 : static int build_primary_vtable (tree, tree);
120 : static int build_secondary_vtable (tree);
121 : static void finish_vtbls (tree);
122 : static void modify_vtable_entry (tree, tree, tree, tree, tree *);
123 : static void finish_struct_bits (tree);
124 : static int alter_access (tree, tree, tree);
125 : static void handle_using_decl (tree, tree);
126 : static tree dfs_modify_vtables (tree, void *);
127 : static tree modify_all_vtables (tree, tree);
128 : static void determine_primary_bases (tree);
129 : static void maybe_warn_about_overly_private_class (tree);
130 : static void add_implicitly_declared_members (tree, tree*, int, int);
131 : static tree fixed_type_or_null (tree, int *, int *);
132 : static tree build_simple_base_path (tree expr, tree binfo);
133 : static void build_vtbl_initializer (tree, tree, tree, tree, int *,
134 : vec<constructor_elt, va_gc> **);
135 : static bool check_bitfield_decl (tree);
136 : static bool check_field_decl (tree, tree, int *, int *);
137 : static void check_field_decls (tree, tree *, int *, int *);
138 : static void build_base_fields (record_layout_info, splay_tree, tree *);
139 : static void check_methods (tree);
140 : static bool accessible_nvdtor_p (tree);
141 :
142 : /* Used by find_flexarrays and related functions. */
143 : struct flexmems_t;
144 : static void diagnose_flexarrays (tree, const flexmems_t *);
145 : static void find_flexarrays (tree, flexmems_t *, bool, bool = false,
146 : bool = false, tree = NULL_TREE);
147 : static void check_flexarrays (tree, flexmems_t * = NULL, bool = false);
148 : static void check_bases (tree, int *, int *);
149 : static void check_bases_and_members (tree);
150 : static tree create_vtable_ptr (tree, tree *);
151 : static void include_empty_classes (record_layout_info);
152 : static void layout_class_type (tree, tree *);
153 : static void propagate_binfo_offsets (tree, tree);
154 : static void layout_virtual_bases (record_layout_info, splay_tree);
155 : static void build_vbase_offset_vtbl_entries (tree, vtbl_init_data *);
156 : static void add_vcall_offset_vtbl_entries_r (tree, vtbl_init_data *);
157 : static void add_vcall_offset_vtbl_entries_1 (tree, vtbl_init_data *);
158 : static void build_vcall_offset_vtbl_entries (tree, vtbl_init_data *);
159 : static void add_vcall_offset (tree, tree, vtbl_init_data *);
160 : static void layout_vtable_decl (tree, int);
161 : static tree dfs_find_final_overrider_pre (tree, void *);
162 : static tree dfs_find_final_overrider_post (tree, void *);
163 : static tree find_final_overrider (tree, tree, tree);
164 : static int make_new_vtable (tree, tree);
165 : static tree get_primary_binfo (tree);
166 : static int maybe_indent_hierarchy (FILE *, int, int);
167 : static tree dump_class_hierarchy_r (FILE *, dump_flags_t, tree, tree, int);
168 : static void dump_class_hierarchy (tree);
169 : static void dump_class_hierarchy_1 (FILE *, dump_flags_t, tree);
170 : static void dump_array (FILE *, tree);
171 : static void dump_vtable (tree, tree, tree);
172 : static void dump_vtt (tree, tree);
173 : static void dump_thunk (FILE *, int, tree);
174 : static tree build_vtable (tree, tree, tree);
175 : static void initialize_vtable (tree, vec<constructor_elt, va_gc> *);
176 : static void layout_nonempty_base_or_field (record_layout_info,
177 : tree, tree, splay_tree);
178 : static void accumulate_vtbl_inits (tree, tree, tree, tree, tree,
179 : vec<constructor_elt, va_gc> **);
180 : static void dfs_accumulate_vtbl_inits (tree, tree, tree, tree, tree,
181 : vec<constructor_elt, va_gc> **);
182 : static void build_rtti_vtbl_entries (tree, vtbl_init_data *);
183 : static void build_vcall_and_vbase_vtbl_entries (tree, vtbl_init_data *);
184 : static void clone_constructors_and_destructors (tree);
185 : static void update_vtable_entry_for_fn (tree, tree, tree, tree *, unsigned);
186 : static void build_ctor_vtbl_group (tree, tree);
187 : static void build_vtt (tree);
188 : static tree binfo_ctor_vtable (tree);
189 : static void build_vtt_inits (tree, tree, vec<constructor_elt, va_gc> **,
190 : tree *);
191 : static tree dfs_build_secondary_vptr_vtt_inits (tree, void *);
192 : static tree dfs_fixup_binfo_vtbls (tree, void *);
193 : static int record_subobject_offset (tree, tree, splay_tree);
194 : static int check_subobject_offset (tree, tree, splay_tree);
195 : static int walk_subobject_offsets (tree, subobject_offset_fn,
196 : tree, splay_tree, tree, int);
197 : static int layout_conflict_p (tree, tree, splay_tree, int);
198 : static int splay_tree_compare_integer_csts (splay_tree_key k1,
199 : splay_tree_key k2);
200 : static void maybe_warn_about_inaccessible_bases (tree);
201 : static bool type_requires_array_cookie (tree);
202 : static bool base_derived_from (tree, tree);
203 : static int empty_base_at_nonzero_offset_p (tree, tree, splay_tree);
204 : static tree end_of_base (tree);
205 : static tree get_vcall_index (tree, tree);
206 : static bool type_maybe_constexpr_default_constructor (tree);
207 : static bool type_maybe_constexpr_destructor (tree);
208 : static bool field_poverlapping_p (tree);
209 : static void propagate_class_warmth_attribute (tree);
210 :
211 : /* Set CURRENT_ACCESS_SPECIFIER based on the protection of DECL. */
212 :
213 : void
214 203257305 : set_current_access_from_decl (tree decl)
215 : {
216 203257305 : if (TREE_PRIVATE (decl))
217 18933136 : current_access_specifier = access_private_node;
218 184324169 : else if (TREE_PROTECTED (decl))
219 11355874 : current_access_specifier = access_protected_node;
220 : else
221 172968295 : current_access_specifier = access_public_node;
222 203257305 : }
223 :
224 : /* Return a COND_EXPR that executes TRUE_STMT if this execution of the
225 : 'structor is in charge of 'structing virtual bases, or FALSE_STMT
226 : otherwise. */
227 :
228 : tree
229 153039 : build_if_in_charge (tree true_stmt, tree false_stmt)
230 : {
231 153039 : gcc_assert (DECL_HAS_IN_CHARGE_PARM_P (current_function_decl));
232 306078 : tree cmp = build2 (NE_EXPR, boolean_type_node,
233 153039 : current_in_charge_parm, integer_zero_node);
234 153039 : tree type = unlowered_expr_type (true_stmt);
235 153039 : if (VOID_TYPE_P (type))
236 7070 : type = unlowered_expr_type (false_stmt);
237 153039 : tree cond = build3 (COND_EXPR, type,
238 : cmp, true_stmt, false_stmt);
239 153039 : return cond;
240 : }
241 :
242 : /* Convert to or from a base subobject. EXPR is an expression of type
243 : `A' or `A*', an expression of type `B' or `B*' is returned. To
244 : convert A to a base B, CODE is PLUS_EXPR and BINFO is the binfo for
245 : the B base instance within A. To convert base A to derived B, CODE
246 : is MINUS_EXPR and BINFO is the binfo for the A instance within B.
247 : In this latter case, A must not be a morally virtual base of B.
248 : NONNULL is true if EXPR is known to be non-NULL (this is only
249 : needed when EXPR is of pointer type). CV qualifiers are preserved
250 : from EXPR. */
251 :
252 : tree
253 57114987 : build_base_path (enum tree_code code,
254 : tree expr,
255 : tree binfo,
256 : int nonnull,
257 : tsubst_flags_t complain)
258 : {
259 57114987 : tree v_binfo = NULL_TREE;
260 57114987 : tree d_binfo = NULL_TREE;
261 57114987 : tree probe;
262 57114987 : tree offset;
263 57114987 : tree target_type;
264 57114987 : tree null_test = NULL;
265 57114987 : tree ptr_target_type;
266 57114987 : int fixed_type_p;
267 57114987 : int want_pointer = TYPE_PTR_P (TREE_TYPE (expr));
268 57114987 : bool has_empty = false;
269 57114987 : bool virtual_access;
270 57114987 : bool rvalue = false;
271 :
272 57114987 : if (expr == error_mark_node || binfo == error_mark_node || !binfo)
273 : return error_mark_node;
274 :
275 122824234 : for (probe = binfo; probe; probe = BINFO_INHERITANCE_CHAIN (probe))
276 : {
277 65709262 : d_binfo = probe;
278 65709262 : if (is_empty_class (BINFO_TYPE (probe)))
279 9029970 : has_empty = true;
280 131327831 : if (!v_binfo && BINFO_VIRTUAL_P (probe))
281 : v_binfo = probe;
282 : }
283 :
284 57114972 : probe = TYPE_MAIN_VARIANT (TREE_TYPE (expr));
285 57114972 : if (want_pointer)
286 53365737 : probe = TYPE_MAIN_VARIANT (TREE_TYPE (probe));
287 57114972 : if (dependent_type_p (probe))
288 276326 : if (tree open = currently_open_class (probe))
289 57114972 : probe = open;
290 :
291 57114972 : if (code == PLUS_EXPR
292 110995791 : && !SAME_BINFO_TYPE_P (BINFO_TYPE (d_binfo), probe))
293 : {
294 : /* This can happen when adjust_result_of_qualified_name_lookup can't
295 : find a unique base binfo in a call to a member function. We
296 : couldn't give the diagnostic then since we might have been calling
297 : a static member function, so we do it now. In other cases, eg.
298 : during error recovery (c++/71979), we may not have a base at all. */
299 8 : if (complain & tf_error)
300 : {
301 8 : tree base = lookup_base (probe, BINFO_TYPE (d_binfo),
302 : ba_unique, NULL, complain);
303 8 : gcc_assert (base == error_mark_node || !base);
304 : }
305 8 : return error_mark_node;
306 : }
307 :
308 60349117 : gcc_assert ((code == MINUS_EXPR
309 : && SAME_BINFO_TYPE_P (BINFO_TYPE (binfo), probe))
310 : || code == PLUS_EXPR);
311 :
312 57114964 : if (binfo == d_binfo)
313 : /* Nothing to do. */
314 : return expr;
315 :
316 7935769 : if (code == MINUS_EXPR && v_binfo)
317 : {
318 12 : if (complain & tf_error)
319 : {
320 9 : if (SAME_BINFO_TYPE_P (BINFO_TYPE (binfo), BINFO_TYPE (v_binfo)))
321 : {
322 9 : if (want_pointer)
323 18 : error ("cannot convert from pointer to base class %qT to "
324 : "pointer to derived class %qT because the base is "
325 9 : "virtual", BINFO_TYPE (binfo), BINFO_TYPE (d_binfo));
326 : else
327 0 : error ("cannot convert from base class %qT to derived "
328 : "class %qT because the base is virtual",
329 0 : BINFO_TYPE (binfo), BINFO_TYPE (d_binfo));
330 : }
331 : else
332 : {
333 0 : if (want_pointer)
334 0 : error ("cannot convert from pointer to base class %qT to "
335 : "pointer to derived class %qT via virtual base %qT",
336 0 : BINFO_TYPE (binfo), BINFO_TYPE (d_binfo),
337 0 : BINFO_TYPE (v_binfo));
338 : else
339 0 : error ("cannot convert from base class %qT to derived "
340 0 : "class %qT via virtual base %qT", BINFO_TYPE (binfo),
341 0 : BINFO_TYPE (d_binfo), BINFO_TYPE (v_binfo));
342 : }
343 : }
344 12 : return error_mark_node;
345 : }
346 :
347 22752108 : bool uneval = (cp_unevaluated_operand != 0
348 7215416 : || processing_template_decl
349 14816511 : || in_template_context);
350 :
351 6880594 : if (!uneval)
352 6880594 : fixed_type_p = resolves_to_fixed_type_p (expr, &nonnull);
353 : else
354 : fixed_type_p = 0;
355 :
356 : /* Do we need to look in the vtable for the real offset? */
357 7935757 : virtual_access = (v_binfo && fixed_type_p <= 0);
358 :
359 : /* For a non-pointer simple base reference, express it as a COMPONENT_REF
360 : without taking its address (and so causing lambda capture, 91933). */
361 7935757 : if (code == PLUS_EXPR
362 7935757 : && !want_pointer
363 : && !has_empty
364 3748860 : && !uneval
365 2215379 : && !virtual_access)
366 2210182 : return build_simple_base_path (expr, binfo);
367 :
368 5725575 : if (!want_pointer)
369 : {
370 1538678 : rvalue = !lvalue_p (expr);
371 : /* This must happen before the call to save_expr. */
372 1538678 : expr = cp_build_addr_expr (expr, complain);
373 : }
374 : else
375 4186897 : expr = mark_rvalue_use (expr);
376 :
377 5725575 : offset = BINFO_OFFSET (binfo);
378 5772810 : target_type = code == PLUS_EXPR ? BINFO_TYPE (binfo) : BINFO_TYPE (d_binfo);
379 : /* TARGET_TYPE has been extracted from BINFO, and, is therefore always
380 : cv-unqualified. Extract the cv-qualifiers from EXPR so that the
381 : expression returned matches the input. */
382 5725575 : target_type = cp_build_qualified_type
383 5725575 : (target_type, cp_type_quals (TREE_TYPE (TREE_TYPE (expr))));
384 5725575 : ptr_target_type = build_pointer_type (target_type);
385 :
386 : /* Don't bother with the calculations inside sizeof; they'll ICE if the
387 : source type is incomplete and the pointer value doesn't matter. In a
388 : template (even in instantiate_non_dependent_expr), we don't have vtables
389 : set up properly yet, and the value doesn't matter there either; we're
390 : just interested in the result of overload resolution. */
391 5725575 : if (uneval)
392 : {
393 1055163 : expr = build_nop (ptr_target_type, expr);
394 1055163 : goto indout;
395 : }
396 :
397 4670412 : if (!COMPLETE_TYPE_P (probe))
398 : {
399 6 : if (complain & tf_error)
400 18 : error ("cannot convert from %qT to base class %qT because %qT is "
401 6 : "incomplete", BINFO_TYPE (d_binfo), BINFO_TYPE (binfo),
402 6 : BINFO_TYPE (d_binfo));
403 6 : return error_mark_node;
404 : }
405 :
406 : /* If we're in an NSDMI, we don't have the full constructor context yet
407 : that we need for converting to a virtual base, so just build a stub
408 : CONVERT_EXPR and expand it later in bot_replace. */
409 4670406 : if (virtual_access && fixed_type_p < 0
410 4670406 : && current_scope () != current_function_decl)
411 : {
412 33 : expr = build1 (CONVERT_EXPR, ptr_target_type, expr);
413 33 : CONVERT_EXPR_VBASE_PATH (expr) = true;
414 33 : goto indout;
415 : }
416 :
417 : /* Do we need to check for a null pointer? */
418 4670373 : if (want_pointer && !nonnull)
419 : {
420 : /* If we know the conversion will not actually change the value
421 : of EXPR, then we can avoid testing the expression for NULL.
422 : We have to avoid generating a COMPONENT_REF for a base class
423 : field, because other parts of the compiler know that such
424 : expressions are always non-NULL. */
425 65337 : if (!virtual_access && integer_zerop (offset))
426 63430 : return build_nop (ptr_target_type, expr);
427 1907 : null_test = error_mark_node;
428 : }
429 :
430 : /* Protect against multiple evaluation if necessary. */
431 4606943 : if (TREE_SIDE_EFFECTS (expr) && (null_test || virtual_access))
432 844 : expr = save_expr (expr);
433 :
434 : /* Store EXPR and build the real null test just before returning. */
435 4606943 : if (null_test)
436 1907 : null_test = expr;
437 :
438 : /* If this is a simple base reference, express it as a COMPONENT_REF. */
439 4606943 : if (code == PLUS_EXPR && !virtual_access
440 : /* We don't build base fields for empty bases, and they aren't very
441 : interesting to the optimizers anyway. */
442 4500875 : && !has_empty)
443 : {
444 2649202 : expr = cp_build_fold_indirect_ref (expr);
445 2649202 : expr = build_simple_base_path (expr, binfo);
446 2649202 : if (rvalue && lvalue_p (expr))
447 0 : expr = move (expr);
448 2649202 : if (want_pointer)
449 2649202 : expr = build_address (expr);
450 2649202 : target_type = TREE_TYPE (expr);
451 2649202 : goto out;
452 : }
453 :
454 1957741 : if (virtual_access)
455 : {
456 : /* Going via virtual base V_BINFO. We need the static offset
457 : from V_BINFO to BINFO, and the dynamic offset from D_BINFO to
458 : V_BINFO. That offset is an entry in D_BINFO's vtable. */
459 69777 : tree v_offset;
460 :
461 69777 : if (fixed_type_p < 0 && in_base_initializer)
462 : {
463 : /* In a base member initializer, we cannot rely on the
464 : vtable being set up. We have to indirect via the
465 : vtt_parm. */
466 6 : tree t;
467 :
468 6 : t = TREE_TYPE (TYPE_VFIELD (current_class_type));
469 6 : t = build_pointer_type (t);
470 6 : v_offset = fold_convert (t, current_vtt_parm);
471 6 : v_offset = cp_build_fold_indirect_ref (v_offset);
472 6 : }
473 : else
474 : {
475 69771 : tree t = expr;
476 69771 : if (sanitize_flags_p (SANITIZE_VPTR)
477 69771 : && fixed_type_p == 0)
478 : {
479 44 : t = cp_ubsan_maybe_instrument_cast_to_vbase (input_location,
480 : probe, expr);
481 44 : if (t == NULL_TREE)
482 69727 : t = expr;
483 : }
484 69771 : v_offset = build_vfield_ref (cp_build_fold_indirect_ref (t),
485 69771 : TREE_TYPE (TREE_TYPE (expr)));
486 : }
487 :
488 69777 : if (v_offset == error_mark_node)
489 : return error_mark_node;
490 :
491 69777 : v_offset = fold_build_pointer_plus (v_offset, BINFO_VPTR_FIELD (v_binfo));
492 69777 : v_offset = build1 (NOP_EXPR,
493 : build_pointer_type (ptrdiff_type_node),
494 : v_offset);
495 69777 : v_offset = cp_build_fold_indirect_ref (v_offset);
496 69777 : TREE_CONSTANT (v_offset) = 1;
497 :
498 139554 : offset = convert_to_integer (ptrdiff_type_node,
499 : size_diffop_loc (input_location, offset,
500 69777 : BINFO_OFFSET (v_binfo)));
501 :
502 69777 : if (!integer_zerop (offset))
503 502 : v_offset = build2 (code, ptrdiff_type_node, v_offset, offset);
504 :
505 69777 : if (fixed_type_p < 0)
506 : /* Negative fixed_type_p means this is a constructor or destructor;
507 : virtual base layout is fixed in in-charge [cd]tors, but not in
508 : base [cd]tors. */
509 43710 : offset = build_if_in_charge
510 43710 : (convert_to_integer (ptrdiff_type_node, BINFO_OFFSET (binfo)),
511 : v_offset);
512 : else
513 : offset = v_offset;
514 : }
515 :
516 1957741 : if (want_pointer)
517 1957741 : target_type = ptr_target_type;
518 :
519 1957741 : if (!integer_zerop (offset))
520 : {
521 70692 : offset = fold_convert (sizetype, offset);
522 70692 : if (code == MINUS_EXPR)
523 439 : offset = fold_build1_loc (input_location, NEGATE_EXPR, sizetype, offset);
524 70692 : expr = fold_build_pointer_plus (expr, offset);
525 : }
526 : else
527 : null_test = NULL;
528 :
529 1957741 : expr = build1 (NOP_EXPR, ptr_target_type, expr);
530 :
531 3012937 : indout:
532 3012937 : if (!want_pointer)
533 : {
534 1538678 : expr = cp_build_fold_indirect_ref (expr);
535 1538678 : if (rvalue)
536 233578 : expr = move (expr);
537 : }
538 :
539 1474259 : out:
540 5662139 : if (null_test)
541 : /* Wrap EXPR in a null test. */
542 1907 : expr = build_if_nonnull (null_test, expr, complain);
543 :
544 : return expr;
545 : }
546 :
547 : /* Subroutine of build_base_path; EXPR and BINFO are as in that function.
548 : Perform a derived-to-base conversion by recursively building up a
549 : sequence of COMPONENT_REFs to the appropriate base fields. */
550 :
551 : static tree
552 16608594 : build_simple_base_path (tree expr, tree binfo)
553 : {
554 16608594 : tree type = BINFO_TYPE (binfo);
555 16608594 : tree d_binfo = BINFO_INHERITANCE_CHAIN (binfo);
556 16608594 : tree field;
557 :
558 16608594 : if (d_binfo == NULL_TREE)
559 : {
560 8123487 : tree temp;
561 :
562 8123487 : gcc_assert (TYPE_MAIN_VARIANT (TREE_TYPE (expr)) == type);
563 :
564 : /* Transform `(a, b).x' into `(*(a, &b)).x', `(a ? b : c).x'
565 : into `(*(a ? &b : &c)).x', and so on. A COND_EXPR is only
566 : an lvalue in the front end; only _DECLs and _REFs are lvalues
567 : in the back end. */
568 8123487 : temp = unary_complex_lvalue (ADDR_EXPR, expr);
569 8123487 : if (temp)
570 0 : expr = cp_build_fold_indirect_ref (temp);
571 :
572 8123487 : return expr;
573 : }
574 :
575 : /* Recurse. */
576 8485107 : expr = build_simple_base_path (expr, d_binfo);
577 :
578 8485107 : for (field = TYPE_FIELDS (BINFO_TYPE (d_binfo));
579 42975969 : field; field = DECL_CHAIN (field))
580 : /* Is this the base field created by build_base_field? */
581 42975969 : if (TREE_CODE (field) == FIELD_DECL
582 9667070 : && DECL_FIELD_IS_BASE (field)
583 9625354 : && TREE_TYPE (field) == type
584 : /* If we're looking for a field in the most-derived class,
585 : also check the field offset; we can have two base fields
586 : of the same type if one is an indirect virtual base and one
587 : is a direct non-virtual base. */
588 51461199 : && (BINFO_INHERITANCE_CHAIN (d_binfo)
589 8123469 : || tree_int_cst_equal (byte_position (field),
590 8123469 : BINFO_OFFSET (binfo))))
591 : {
592 : /* We don't use build_class_member_access_expr here, as that
593 : has unnecessary checks, and more importantly results in
594 : recursive calls to dfs_walk_once. */
595 8485107 : int type_quals = cp_type_quals (TREE_TYPE (expr));
596 :
597 8485107 : expr = build3 (COMPONENT_REF,
598 : cp_build_qualified_type (type, type_quals),
599 : expr, field, NULL_TREE);
600 : /* Mark the expression const or volatile, as appropriate.
601 : Even though we've dealt with the type above, we still have
602 : to mark the expression itself. */
603 8485107 : if (type_quals & TYPE_QUAL_CONST)
604 750424 : TREE_READONLY (expr) = 1;
605 8485107 : if (type_quals & TYPE_QUAL_VOLATILE)
606 28085 : TREE_THIS_VOLATILE (expr) = 1;
607 :
608 8485107 : return expr;
609 : }
610 :
611 : /* Didn't find the base field?!? */
612 0 : gcc_unreachable ();
613 : }
614 :
615 : /* Convert OBJECT to the base TYPE. OBJECT is an expression whose
616 : type is a class type or a pointer to a class type. In the former
617 : case, TYPE is also a class type; in the latter it is another
618 : pointer type. If CHECK_ACCESS is true, an error message is emitted
619 : if TYPE is inaccessible. If OBJECT has pointer type, the value is
620 : assumed to be non-NULL. */
621 :
622 : tree
623 1885806 : convert_to_base (tree object, tree type, bool check_access, bool nonnull,
624 : tsubst_flags_t complain)
625 : {
626 1885806 : tree binfo;
627 1885806 : tree object_type;
628 :
629 1885806 : if (TYPE_PTR_P (TREE_TYPE (object)))
630 : {
631 204178 : object_type = TREE_TYPE (TREE_TYPE (object));
632 204178 : type = TREE_TYPE (type);
633 : }
634 : else
635 1681628 : object_type = TREE_TYPE (object);
636 :
637 1888458 : binfo = lookup_base (object_type, type, check_access ? ba_check : ba_unique,
638 : NULL, complain);
639 1885806 : if (!binfo || binfo == error_mark_node)
640 87 : return error_mark_node;
641 :
642 1885719 : return build_base_path (PLUS_EXPR, object, binfo, nonnull, complain);
643 : }
644 :
645 : /* EXPR is an expression with unqualified class type. BASE is a base
646 : binfo of that class type. Returns EXPR, converted to the BASE
647 : type. This function assumes that EXPR is the most derived class;
648 : therefore virtual bases can be found at their static offsets. */
649 :
650 : tree
651 1544209 : convert_to_base_statically (tree expr, tree base)
652 : {
653 1544209 : tree expr_type;
654 :
655 1544209 : expr_type = TREE_TYPE (expr);
656 1544209 : if (!SAME_BINFO_TYPE_P (BINFO_TYPE (base), expr_type))
657 : {
658 : /* If this is a non-empty base, use a COMPONENT_REF. */
659 1544209 : if (!is_empty_class (BINFO_TYPE (base)))
660 1325626 : return build_simple_base_path (expr, base);
661 :
662 : /* We use fold_build2 and fold_convert below to simplify the trees
663 : provided to the optimizers. It is not safe to call these functions
664 : when processing a template because they do not handle C++-specific
665 : trees. */
666 218583 : gcc_assert (!processing_template_decl);
667 218583 : expr = cp_build_addr_expr (expr, tf_warning_or_error);
668 218583 : if (!integer_zerop (BINFO_OFFSET (base)))
669 189 : expr = fold_build_pointer_plus_loc (input_location,
670 189 : expr, BINFO_OFFSET (base));
671 218583 : expr = fold_convert (build_pointer_type (BINFO_TYPE (base)), expr);
672 218583 : expr = build_fold_indirect_ref_loc (input_location, expr);
673 : }
674 :
675 : return expr;
676 : }
677 :
678 : /* True IFF EXPR is a reference to an empty base class "subobject", as built in
679 : convert_to_base_statically. We look for the result of the fold_convert
680 : call, a NOP_EXPR from one pointer type to another, where the target is an
681 : empty base of the original type. */
682 :
683 : bool
684 38280422 : is_empty_base_ref (tree expr)
685 : {
686 38280422 : if (INDIRECT_REF_P (expr))
687 30765927 : expr = TREE_OPERAND (expr, 0);
688 38280422 : if (TREE_CODE (expr) != NOP_EXPR)
689 : return false;
690 1091158 : tree type = TREE_TYPE (expr);
691 1091158 : if (!POINTER_TYPE_P (type))
692 : return false;
693 1091158 : type = TREE_TYPE (type);
694 1091158 : if (!is_empty_class (type))
695 : return false;
696 454783 : STRIP_NOPS (expr);
697 454783 : tree fromtype = TREE_TYPE (expr);
698 454783 : if (!POINTER_TYPE_P (fromtype))
699 : return false;
700 454783 : fromtype = TREE_TYPE (fromtype);
701 446507 : return (CLASS_TYPE_P (fromtype)
702 446507 : && !same_type_ignoring_top_level_qualifiers_p (fromtype, type)
703 900656 : && DERIVED_FROM_P (type, fromtype));
704 : }
705 :
706 : tree
707 1636018 : build_vfield_ref (tree datum, tree type)
708 : {
709 1636018 : tree vfield, vcontext;
710 :
711 1636018 : if (datum == error_mark_node
712 : /* Can happen in case of duplicate base types (c++/59082). */
713 1636018 : || !TYPE_VFIELD (type))
714 : return error_mark_node;
715 :
716 : /* First, convert to the requested type. */
717 1636018 : if (!same_type_ignoring_top_level_qualifiers_p (TREE_TYPE (datum), type))
718 0 : datum = convert_to_base (datum, type, /*check_access=*/false,
719 : /*nonnull=*/true, tf_warning_or_error);
720 :
721 : /* Second, the requested type may not be the owner of its own vptr.
722 : If not, convert to the base class that owns it. We cannot use
723 : convert_to_base here, because VCONTEXT may appear more than once
724 : in the inheritance hierarchy of TYPE, and thus direct conversion
725 : between the types may be ambiguous. Following the path back up
726 : one step at a time via primary bases avoids the problem. */
727 1636018 : vfield = TYPE_VFIELD (type);
728 1636018 : vcontext = DECL_CONTEXT (vfield);
729 3574495 : while (!same_type_ignoring_top_level_qualifiers_p (vcontext, type))
730 : {
731 1938477 : datum = build_simple_base_path (datum, CLASSTYPE_PRIMARY_BINFO (type));
732 1938477 : type = TREE_TYPE (datum);
733 : }
734 :
735 1636018 : return build3 (COMPONENT_REF, TREE_TYPE (vfield), datum, vfield, NULL_TREE);
736 : }
737 :
738 : /* Given an object INSTANCE, return an expression which yields the
739 : vtable element corresponding to INDEX. There are many special
740 : cases for INSTANCE which we take care of here, mainly to avoid
741 : creating extra tree nodes when we don't have to. */
742 :
743 : tree
744 467995 : build_vtbl_ref (tree instance, tree idx)
745 : {
746 467995 : tree aref;
747 467995 : tree vtbl = NULL_TREE;
748 :
749 : /* Try to figure out what a reference refers to, and
750 : access its virtual function table directly. */
751 :
752 467995 : int cdtorp = 0;
753 467995 : tree fixed_type = fixed_type_or_null (instance, NULL, &cdtorp);
754 :
755 467995 : tree basetype = non_reference (TREE_TYPE (instance));
756 :
757 467995 : if (fixed_type && !cdtorp)
758 : {
759 116 : tree binfo = lookup_base (fixed_type, basetype,
760 : ba_unique, NULL, tf_none);
761 116 : if (binfo && binfo != error_mark_node)
762 101 : vtbl = unshare_expr (BINFO_VTABLE (binfo));
763 : }
764 :
765 101 : if (!vtbl)
766 467964 : vtbl = build_vfield_ref (instance, basetype);
767 :
768 467995 : aref = build_array_ref (input_location, vtbl, idx);
769 935959 : TREE_CONSTANT (aref) |= TREE_CONSTANT (vtbl) && TREE_CONSTANT (idx);
770 :
771 467995 : return aref;
772 : }
773 :
774 : /* Given a stable object pointer INSTANCE_PTR, return an expression which
775 : yields a function pointer corresponding to vtable element INDEX. */
776 :
777 : tree
778 467084 : build_vfn_ref (tree instance_ptr, tree idx)
779 : {
780 467084 : tree aref;
781 :
782 467084 : aref = build_vtbl_ref (cp_build_fold_indirect_ref (instance_ptr), idx);
783 :
784 : /* When using function descriptors, the address of the
785 : vtable entry is treated as a function pointer. */
786 467084 : if (TARGET_VTABLE_USES_DESCRIPTORS)
787 : aref = build1 (NOP_EXPR, TREE_TYPE (aref),
788 : cp_build_addr_expr (aref, tf_warning_or_error));
789 :
790 : /* Remember this as a method reference, for later devirtualization. */
791 467084 : aref = build3 (OBJ_TYPE_REF, TREE_TYPE (aref), aref, instance_ptr,
792 467084 : fold_convert (TREE_TYPE (instance_ptr), idx));
793 :
794 467084 : return aref;
795 : }
796 :
797 : /* Return the name of the virtual function table (as an IDENTIFIER_NODE)
798 : for the given TYPE. */
799 :
800 : static tree
801 1750710 : get_vtable_name (tree type)
802 : {
803 0 : return mangle_vtbl_for_type (type);
804 : }
805 :
806 : /* DECL is an entity associated with TYPE, like a virtual table or an
807 : implicitly generated constructor. Determine whether or not DECL
808 : should have external or internal linkage at the object file
809 : level. This routine does not deal with COMDAT linkage and other
810 : similar complexities; it simply sets TREE_PUBLIC if it possible for
811 : entities in other translation units to contain copies of DECL, in
812 : the abstract. */
813 :
814 : void
815 35831633 : set_linkage_according_to_type (tree /*type*/, tree decl)
816 : {
817 35831633 : TREE_PUBLIC (decl) = 1;
818 35831633 : determine_visibility (decl);
819 35831633 : }
820 :
821 : /* Create a VAR_DECL for a primary or secondary vtable for CLASS_TYPE.
822 : (For a secondary vtable for B-in-D, CLASS_TYPE should be D, not B.)
823 : Use NAME for the name of the vtable, and VTABLE_TYPE for its type. */
824 :
825 : static tree
826 2174020 : build_vtable (tree class_type, tree name, tree vtable_type)
827 : {
828 2174020 : tree decl;
829 :
830 2174020 : decl = build_lang_decl (VAR_DECL, name, vtable_type);
831 : /* vtable names are already mangled; give them their DECL_ASSEMBLER_NAME
832 : now to avoid confusion in mangle_decl. */
833 2174020 : SET_DECL_ASSEMBLER_NAME (decl, name);
834 2174020 : DECL_CONTEXT (decl) = class_type;
835 2174020 : DECL_ARTIFICIAL (decl) = 1;
836 2174020 : TREE_STATIC (decl) = 1;
837 2174020 : TREE_READONLY (decl) = 1;
838 2174020 : DECL_VIRTUAL_P (decl) = 1;
839 2185502 : SET_DECL_ALIGN (decl, TARGET_VTABLE_ENTRY_ALIGN);
840 2174020 : DECL_USER_ALIGN (decl) = true;
841 2174020 : DECL_VTABLE_OR_VTT_P (decl) = 1;
842 2174020 : set_linkage_according_to_type (class_type, decl);
843 : /* The vtable has not been defined -- yet. */
844 2174020 : DECL_EXTERNAL (decl) = 1;
845 2174020 : DECL_NOT_REALLY_EXTERN (decl) = 1;
846 :
847 : /* Mark the VAR_DECL node representing the vtable itself as a
848 : "gratuitous" one, thereby forcing dwarfout.c to ignore it. It
849 : is rather important that such things be ignored because any
850 : effort to actually generate DWARF for them will run into
851 : trouble when/if we encounter code like:
852 :
853 : #pragma interface
854 : struct S { virtual void member (); };
855 :
856 : because the artificial declaration of the vtable itself (as
857 : manufactured by the g++ front end) will say that the vtable is
858 : a static member of `S' but only *after* the debug output for
859 : the definition of `S' has already been output. This causes
860 : grief because the DWARF entry for the definition of the vtable
861 : will try to refer back to an earlier *declaration* of the
862 : vtable as a static member of `S' and there won't be one. We
863 : might be able to arrange to have the "vtable static member"
864 : attached to the member list for `S' before the debug info for
865 : `S' get written (which would solve the problem) but that would
866 : require more intrusive changes to the g++ front end. */
867 2174020 : DECL_IGNORED_P (decl) = 1;
868 :
869 2174020 : return decl;
870 : }
871 :
872 : /* Get the VAR_DECL of the vtable for TYPE. TYPE need not be polymorphic,
873 : or even complete. If this does not exist, create it. If COMPLETE is
874 : nonzero, then complete the definition of it -- that will render it
875 : impossible to actually build the vtable, but is useful to get at those
876 : which are known to exist in the runtime. */
877 :
878 : tree
879 8268978 : get_vtable_decl (tree type, int complete)
880 : {
881 8268978 : tree decl;
882 :
883 8268978 : if (CLASSTYPE_VTABLES (type))
884 6518268 : return CLASSTYPE_VTABLES (type);
885 :
886 1750710 : decl = build_vtable (type, get_vtable_name (type), vtbl_type_node);
887 1750710 : CLASSTYPE_VTABLES (type) = decl;
888 :
889 1750710 : if (complete)
890 : {
891 39117 : DECL_EXTERNAL (decl) = 1;
892 39117 : cp_finish_decl (decl, NULL_TREE, false, NULL_TREE, 0);
893 : }
894 :
895 : return decl;
896 : }
897 :
898 : /* Build the primary virtual function table for TYPE. If BINFO is
899 : non-NULL, build the vtable starting with the initial approximation
900 : that it is the same as the one which is the head of the association
901 : list. Returns a nonzero value if a new vtable is actually
902 : created. */
903 :
904 : static int
905 6507757 : build_primary_vtable (tree binfo, tree type)
906 : {
907 6507757 : tree decl;
908 6507757 : tree virtuals;
909 :
910 6507757 : decl = get_vtable_decl (type, /*complete=*/0);
911 :
912 6507757 : if (binfo)
913 : {
914 6262915 : if (BINFO_NEW_VTABLE_MARKED (binfo))
915 : /* We have already created a vtable for this base, so there's
916 : no need to do it again. */
917 : return 0;
918 :
919 1466751 : virtuals = copy_list (BINFO_VIRTUALS (binfo));
920 1466751 : TREE_TYPE (decl) = TREE_TYPE (get_vtbl_decl_for_binfo (binfo));
921 1466751 : DECL_SIZE (decl) = TYPE_SIZE (TREE_TYPE (decl));
922 1466751 : DECL_SIZE_UNIT (decl) = TYPE_SIZE_UNIT (TREE_TYPE (decl));
923 : }
924 : else
925 : {
926 244842 : gcc_assert (TREE_TYPE (decl) == vtbl_type_node);
927 : virtuals = NULL_TREE;
928 : }
929 :
930 : /* Initialize the association list for this type, based
931 : on our first approximation. */
932 1711593 : BINFO_VTABLE (TYPE_BINFO (type)) = decl;
933 1711593 : BINFO_VIRTUALS (TYPE_BINFO (type)) = virtuals;
934 1711593 : SET_BINFO_NEW_VTABLE_MARKED (TYPE_BINFO (type));
935 : return 1;
936 : }
937 :
938 : /* Give BINFO a new virtual function table which is initialized
939 : with a skeleton-copy of its original initialization. The only
940 : entry that changes is the `delta' entry, so we can really
941 : share a lot of structure.
942 :
943 : FOR_TYPE is the most derived type which caused this table to
944 : be needed.
945 :
946 : Returns nonzero if we haven't met BINFO before.
947 :
948 : The order in which vtables are built (by calling this function) for
949 : an object must remain the same, otherwise a binary incompatibility
950 : can result. */
951 :
952 : static int
953 716879 : build_secondary_vtable (tree binfo)
954 : {
955 716879 : if (BINFO_NEW_VTABLE_MARKED (binfo))
956 : /* We already created a vtable for this base. There's no need to
957 : do it again. */
958 : return 0;
959 :
960 : /* Remember that we've created a vtable for this BINFO, so that we
961 : don't try to do so again. */
962 249136 : SET_BINFO_NEW_VTABLE_MARKED (binfo);
963 :
964 : /* Make fresh virtual list, so we can smash it later. */
965 249136 : BINFO_VIRTUALS (binfo) = copy_list (BINFO_VIRTUALS (binfo));
966 :
967 : /* Secondary vtables are laid out as part of the same structure as
968 : the primary vtable. */
969 249136 : BINFO_VTABLE (binfo) = NULL_TREE;
970 249136 : return 1;
971 : }
972 :
973 : /* Create a new vtable for BINFO which is the hierarchy dominated by
974 : T. Return nonzero if we actually created a new vtable. */
975 :
976 : static int
977 6979794 : make_new_vtable (tree t, tree binfo)
978 : {
979 6979794 : if (binfo == TYPE_BINFO (t))
980 : /* In this case, it is *type*'s vtable we are modifying. We start
981 : with the approximation that its vtable is that of the
982 : immediate base class. */
983 6262915 : return build_primary_vtable (binfo, t);
984 : else
985 : /* This is our very own copy of `basetype' to play with. Later,
986 : we will fill in all the virtual functions that override the
987 : virtual functions in these base classes which are not defined
988 : by the current type. */
989 716879 : return build_secondary_vtable (binfo);
990 : }
991 :
992 : /* Make *VIRTUALS, an entry on the BINFO_VIRTUALS list for BINFO
993 : (which is in the hierarchy dominated by T) list FNDECL as its
994 : BV_FN. DELTA is the required constant adjustment from the `this'
995 : pointer where the vtable entry appears to the `this' required when
996 : the function is actually called. */
997 :
998 : static void
999 7363264 : modify_vtable_entry (tree t,
1000 : tree binfo,
1001 : tree fndecl,
1002 : tree delta,
1003 : tree *virtuals)
1004 : {
1005 7363264 : tree v;
1006 :
1007 7363264 : v = *virtuals;
1008 :
1009 7363264 : if (fndecl != BV_FN (v)
1010 7363264 : || !tree_int_cst_equal (delta, BV_DELTA (v)))
1011 : {
1012 : /* We need a new vtable for BINFO. */
1013 5263907 : if (make_new_vtable (t, binfo))
1014 : {
1015 : /* If we really did make a new vtable, we also made a copy
1016 : of the BINFO_VIRTUALS list. Now, we have to find the
1017 : corresponding entry in that list. */
1018 0 : *virtuals = BINFO_VIRTUALS (binfo);
1019 0 : while (BV_FN (*virtuals) != BV_FN (v))
1020 0 : *virtuals = TREE_CHAIN (*virtuals);
1021 : v = *virtuals;
1022 : }
1023 :
1024 5263907 : BV_DELTA (v) = delta;
1025 5263907 : BV_VCALL_INDEX (v) = NULL_TREE;
1026 5263907 : BV_FN (v) = fndecl;
1027 : }
1028 7363264 : }
1029 :
1030 :
1031 : /* Check if the object parameter of an iobj member function corresponds to
1032 : another parameter type. CONTEXT is the class that the implicit object
1033 : parameter is considered to refer to. */
1034 :
1035 : bool
1036 282417 : iobj_parm_corresponds_to (tree iobj_fn, tree xobj_param, tree context)
1037 : {
1038 282417 : tree iobj_fn_type = TREE_TYPE (iobj_fn);
1039 :
1040 : /* If the iobj member function was introduced with a using declaration, the
1041 : type of its object parameter is considered to be that of the class it was
1042 : introduced into.
1043 :
1044 : [over.match.funcs.general.4]
1045 : For non-conversion functions that are implicit object member
1046 : functions nominated by a using-declaration in a derived class, the
1047 : function is considered to be a member of the derived class for the purpose
1048 : of defining the type of the implicit object parameter.
1049 :
1050 : Unfortunately, because of this rule, we can't just compare the xobj member
1051 : function's DECL_CONTEXT to its object parameter.
1052 :
1053 : struct S;
1054 :
1055 : struct B {
1056 : int f(this S&) { return 5; }
1057 : };
1058 :
1059 : struct S : B {
1060 : using B::f;
1061 : int f() { return 10; }
1062 : };
1063 :
1064 : The using declaration does not change the object parameter of B::f as it
1065 : is an xobj member function. However, its object parameter still
1066 : corresponds to S::f as it was declared with an object parameter of type
1067 : S const&. The DECL_CONTEXT of B::f is B, so if we compare the type of the
1068 : object parameter to that, it will not match. If we naively assume a
1069 : different type from the DECL_CONTEXT for an xobj parameter means that the
1070 : object parameters do not correspond, then the object parameters in the
1071 : above example will be considered non-corresponding.
1072 :
1073 : As a result of this, B::f would incorrectly not be discarded, causing an
1074 : ambiguity when f is called on an object of type S.
1075 :
1076 : This also impacts member functions with constraints as in the following
1077 : example.
1078 :
1079 : template<typename = void>
1080 : struct S;
1081 :
1082 : template<typename = void>
1083 : struct B {
1084 : int f(this S<>&) requires true { return 5; }
1085 : };
1086 :
1087 : template<typename>
1088 : struct S : B<> {
1089 : using B<>::f;
1090 : int f() { return 10; }
1091 : };
1092 :
1093 : Once again, if we compare the DECL_CONTEXT of B<>::f to it's xobj
1094 : parameter, it would not match. If the object parameters do not
1095 : correspond, constraints are not taken into account, so in this example we
1096 : would (probably) get an ambiguous lookup instead of correctly picking
1097 : B<>::f.
1098 :
1099 : Because of this caveat, we must actually compare the type of the iobj
1100 : parameter to the type of the xobj parameter, shortcuts will have these
1101 : edge cases.
1102 :
1103 : Aside from the more complex reasons above, this logic also implicitly
1104 : handles xobj parameters of pointer type, we don't have to explicitly
1105 : check for that case. */
1106 :
1107 282417 : if (!same_type_ignoring_top_level_qualifiers_p
1108 282417 : (context, non_reference (xobj_param)))
1109 : return false;
1110 :
1111 : /* We don't get to bail yet even if we have a by-value xobj parameter,
1112 : a by-value xobj parameter can correspond to an iobj parameter provided the
1113 : iobj member function is not declared with a reference qualifier.
1114 :
1115 : From this point on, we know we are dealing with an xobj parameter that has
1116 : an object parameter of the same type as the class it was declared in.
1117 : We still don't know if we have a reference or by-value parameter yet
1118 : though. */
1119 :
1120 282408 : cp_ref_qualifier const iobj_ref_qual = type_memfn_rqual (iobj_fn_type);
1121 : /* We only care about cv qualifiers when determining correspondence. */
1122 282408 : static constexpr cp_cv_quals cv_bits = TYPE_QUAL_VOLATILE
1123 : | TYPE_QUAL_CONST;
1124 282408 : cp_cv_quals const iobj_cv_quals = type_memfn_quals (iobj_fn_type) & cv_bits;
1125 : /* We need to ignore the ref qualifier of the xobj parameter if the iobj
1126 : member function lacks a ref qualifier.
1127 :
1128 : [basic.scope.scope.3]
1129 : Two non-static member functions have corresponding object parameters if:
1130 : -- exactly one is an implicit object member function with no ref-qualifier
1131 : and the types of their object parameters ([dcl.fct]), after removing
1132 : top-level references, are the same, or
1133 : -- their object parameters have the same type.
1134 :
1135 : The cv qualifiers of a by-value parameter are supposed to be discarded, so
1136 : we ignore them.
1137 :
1138 : [dcl.fct.5]
1139 : After producing the list of parameter types, any top-level cv-qualifiers
1140 : modifying a parameter type are deleted when forming the function type.
1141 :
1142 : However, they still need to be taken into account when our xobj parameter
1143 : is a reference that is being ignored (according to [basic.scope.scope.3]
1144 : quoted above), but when we are actually dealing with a by-value xobj
1145 : parameter we can proceed following this table.
1146 : | iobj | xobj | equal |
1147 : | none | none | X |
1148 : | none | c | X |
1149 : | none | v | X |
1150 : | none | cv | X |
1151 : | c | none | O |
1152 : | c | c | O |
1153 : | c | v | O |
1154 : | c | cv | O |
1155 : | v | none | O |
1156 : | v | c | O |
1157 : | v | v | O |
1158 : | v | cv | O |
1159 : | cv | none | O |
1160 : | cv | c | O |
1161 : | cv | v | O |
1162 : | cv | cv | O |
1163 :
1164 : Additionally, if the iobj member function is ref qualified, we aren't
1165 : ignoring the ref qualifier of the iobj parameter, so we can't be dealing
1166 : with correspondence in that case either.
1167 :
1168 : So to recap, if we have a by-value xobj parameter, we know for sure that
1169 : we aren't dealing with corresponding object parameters if the iobj member
1170 : function has any cv-ref qualifiers. The only case where we might still be
1171 : dealing with corresponding object parameters is when the iobj member
1172 : function lacks any cv-ref qualification. */
1173 282408 : if (!TYPE_REF_P (xobj_param))
1174 : {
1175 611 : if (iobj_ref_qual || iobj_cv_quals)
1176 : return false;
1177 : }
1178 : else
1179 : {
1180 : /* We are dealing with an xobj parameter that is a reference now, but due
1181 : to [basic.scope.scope.3] we need to ignore its ref qual. */
1182 563594 : cp_ref_qualifier const xobj_ref_qual = [&](){
1183 281797 : if (!TYPE_REF_P (xobj_param) || !iobj_ref_qual)
1184 : return REF_QUAL_NONE;
1185 816 : return TYPE_REF_IS_RVALUE (xobj_param) ? REF_QUAL_RVALUE
1186 : : REF_QUAL_LVALUE;
1187 281797 : }(); /* IILE. */
1188 :
1189 : /* Even if we are ignoring the reference qualifier, the xobj parameter
1190 : was still a reference so we still take the cv qualifiers into
1191 : account. */
1192 281797 : cp_cv_quals const xobj_cv_quals
1193 281797 : = cp_type_quals (TREE_TYPE (xobj_param)) & cv_bits;
1194 :
1195 : /* Finally, if the qualifications don't match exactly, the object
1196 : parameters don't correspond. */
1197 281797 : if (iobj_ref_qual != xobj_ref_qual
1198 281413 : || iobj_cv_quals != xobj_cv_quals)
1199 : return false;
1200 : }
1201 : /* If we got past everything else, the object parameters of fn1 and fn2
1202 : definitely correspond. */
1203 : return true;
1204 : }
1205 :
1206 : /* True if FN and METHOD have corresponding object parms per
1207 : [basic.scope.scope], or if one of them is a static member function (which
1208 : are considered to have an object parm that corresponds to any other).
1209 : CONTEXT is the class that an implicit object member function is considered
1210 : to be a member of for the purpose of this comparison, per
1211 : [over.match.funcs]. */
1212 :
1213 : bool
1214 413764378 : object_parms_correspond (tree fn, tree method, tree context)
1215 : {
1216 413764378 : tree fn_type = TREE_TYPE (fn);
1217 413764378 : tree method_type = TREE_TYPE (method);
1218 :
1219 : /* Compare the quals on the 'this' parm. Don't compare
1220 : the whole types, as used functions are treated as
1221 : coming from the using class in overload resolution. */
1222 413764378 : if (DECL_IOBJ_MEMBER_FUNCTION_P (fn)
1223 413764378 : && DECL_IOBJ_MEMBER_FUNCTION_P (method))
1224 : {
1225 : /* Either both or neither need to be ref-qualified for
1226 : differing quals to allow overloading before C++20 (P1787R6). */
1227 411600731 : if ((cxx_dialect >= cxx20
1228 3485018 : || (FUNCTION_REF_QUALIFIED (fn_type)
1229 3485018 : == FUNCTION_REF_QUALIFIED (method_type)))
1230 415085741 : && (type_memfn_quals (fn_type) != type_memfn_quals (method_type)
1231 393744382 : || type_memfn_rqual (fn_type) != type_memfn_rqual (method_type)))
1232 18225491 : return false;
1233 393375240 : return true;
1234 : }
1235 : /* Treat a static member function as corresponding to any object parm. */
1236 2163647 : else if (DECL_STATIC_FUNCTION_P (fn) || DECL_STATIC_FUNCTION_P (method))
1237 : return true;
1238 : /* Handle special correspondence rules for xobj vs xobj and xobj vs iobj
1239 : member function declarations.
1240 : We don't worry about static member functions here. */
1241 9170 : else if (DECL_XOBJ_MEMBER_FUNCTION_P (fn)
1242 17600 : && DECL_XOBJ_MEMBER_FUNCTION_P (method))
1243 : {
1244 23142 : auto get_object_param = [] (tree fn)
1245 : {
1246 15428 : return TREE_VALUE (TYPE_ARG_TYPES (TREE_TYPE (fn)));
1247 : };
1248 : /* We skip the object parameter below, check it here instead of
1249 : making changes to that code. */
1250 7714 : tree fn_param = get_object_param (fn);
1251 7714 : tree method_param = get_object_param (method);
1252 7714 : if (!same_type_p (fn_param, method_param))
1253 2005 : return false;
1254 : }
1255 : else
1256 : {
1257 1456 : tree xobj_fn = DECL_XOBJ_MEMBER_FUNCTION_P (fn) ? fn : method;
1258 1456 : tree iobj_fn = xobj_fn != fn ? fn : method;
1259 1456 : tree xobj_param = TREE_VALUE (TYPE_ARG_TYPES (TREE_TYPE (xobj_fn)));
1260 :
1261 1456 : return iobj_parm_corresponds_to (iobj_fn, xobj_param, context);
1262 : }
1263 :
1264 5709 : return true;
1265 : }
1266 :
1267 : /* Add method METHOD to class TYPE. If VIA_USING indicates whether
1268 : METHOD is being injected via a using_decl. Returns true if the
1269 : method could be added to the method vec. */
1270 :
1271 : bool
1272 339802896 : add_method (tree type, tree method, bool via_using)
1273 : {
1274 339802896 : if (method == error_mark_node)
1275 : return false;
1276 :
1277 339802896 : gcc_assert (!DECL_EXTERN_C_P (method));
1278 :
1279 339802896 : tree *slot = find_member_slot (type, DECL_NAME (method));
1280 339802896 : tree current_fns = slot ? *slot : NULL_TREE;
1281 :
1282 : /* See below. */
1283 339802896 : int losem = -1;
1284 :
1285 : /* Check to see if we've already got this method. */
1286 1354517086 : for (ovl_iterator iter (current_fns); iter; ++iter)
1287 : {
1288 571122230 : tree fn = *iter;
1289 :
1290 571122230 : if (TREE_CODE (fn) != TREE_CODE (method))
1291 155902852 : continue;
1292 :
1293 : /* Two using-declarations can coexist, we'll complain about ambiguity in
1294 : overload resolution. */
1295 3755569 : if (via_using && iter.using_p ()
1296 : /* Except handle inherited constructors specially. */
1297 419356226 : && ! DECL_CONSTRUCTOR_P (fn))
1298 : {
1299 1519863 : if (fn == method)
1300 : /* Don't add the same one twice. */
1301 12429 : return false;
1302 1519854 : continue;
1303 : }
1304 :
1305 : /* [over.load] Member function declarations with the
1306 : same name and the same parameter types cannot be
1307 : overloaded if any of them is a static member
1308 : function declaration.
1309 :
1310 : [over.load] Member function declarations with the same name and
1311 : the same parameter-type-list as well as member function template
1312 : declarations with the same name, the same parameter-type-list, and
1313 : the same template parameter lists cannot be overloaded if any of
1314 : them, but not all, have a ref-qualifier.
1315 :
1316 : [namespace.udecl] When a using-declaration brings names
1317 : from a base class into a derived class scope, member
1318 : functions in the derived class override and/or hide member
1319 : functions with the same name and parameter types in a base
1320 : class (rather than conflicting). */
1321 413699515 : if (!object_parms_correspond (fn, method, type))
1322 18228569 : continue;
1323 :
1324 395470946 : tree fn_type = TREE_TYPE (fn);
1325 395470946 : tree method_type = TREE_TYPE (method);
1326 :
1327 395470946 : tree real_fn = fn;
1328 395470946 : tree real_method = method;
1329 :
1330 : /* Templates and conversion ops must match return types. */
1331 790786014 : if ((DECL_CONV_FN_P (fn) || TREE_CODE (fn) == TEMPLATE_DECL)
1332 546773428 : && !same_type_p (TREE_TYPE (fn_type), TREE_TYPE (method_type)))
1333 4245320 : continue;
1334 :
1335 : /* For templates, the template parameters must be identical. */
1336 391225626 : if (TREE_CODE (fn) == TEMPLATE_DECL)
1337 : {
1338 294425924 : if (!comp_template_parms (DECL_TEMPLATE_PARMS (fn),
1339 147212962 : DECL_TEMPLATE_PARMS (method)))
1340 102205832 : continue;
1341 :
1342 45007130 : real_fn = DECL_TEMPLATE_RESULT (fn);
1343 45007130 : real_method = DECL_TEMPLATE_RESULT (method);
1344 : }
1345 :
1346 289019794 : tree parms1 = TYPE_ARG_TYPES (fn_type);
1347 289019794 : tree parms2 = TYPE_ARG_TYPES (method_type);
1348 289019794 : if (! DECL_STATIC_FUNCTION_P (real_fn))
1349 287650397 : parms1 = TREE_CHAIN (parms1);
1350 289019794 : if (! DECL_STATIC_FUNCTION_P (real_method))
1351 287642357 : parms2 = TREE_CHAIN (parms2);
1352 :
1353 : /* Bring back parameters omitted from an inherited ctor. The
1354 : method and the function can have different omittedness. */
1355 289019794 : if (ctor_omit_inherited_parms (real_fn))
1356 729 : parms1 = FUNCTION_FIRST_USER_PARMTYPE (DECL_CLONED_FUNCTION (real_fn));
1357 289019794 : if (ctor_omit_inherited_parms (real_method))
1358 330 : parms2 = (FUNCTION_FIRST_USER_PARMTYPE
1359 : (DECL_CLONED_FUNCTION (real_method)));
1360 :
1361 289019794 : if (!compparms (parms1, parms2))
1362 285515402 : continue;
1363 :
1364 3504392 : tree fn_constraints = get_constraints (fn);
1365 3504392 : tree method_constraints = get_constraints (method);
1366 :
1367 3504392 : if (fn_constraints && method_constraints
1368 2950926 : && DECL_CONTEXT (fn) != type
1369 3504404 : && !processing_template_decl)
1370 : {
1371 12 : if (TREE_CODE (fn) == TEMPLATE_DECL)
1372 12 : ++processing_template_decl;
1373 12 : if (tree outer_args = outer_template_args (fn))
1374 9 : fn_constraints = tsubst_constraint_info (fn_constraints,
1375 : outer_args,
1376 : tf_warning_or_error,
1377 : fn);
1378 12 : if (tree outer_args = outer_template_args (method))
1379 9 : method_constraints = tsubst_constraint_info (method_constraints,
1380 : outer_args,
1381 : tf_warning_or_error,
1382 : method);
1383 12 : if (TREE_CODE (fn) == TEMPLATE_DECL)
1384 12 : --processing_template_decl;
1385 : }
1386 :
1387 3504392 : if (!equivalent_constraints (fn_constraints, method_constraints))
1388 : {
1389 3316236 : if (processing_template_decl)
1390 : /* We can't check satisfaction in dependent context, wait until
1391 : the class is instantiated. */
1392 490781 : continue;
1393 :
1394 2825455 : special_function_kind sfk = special_memfn_p (method);
1395 :
1396 5510881 : if (sfk == sfk_none
1397 626226 : || DECL_INHERITED_CTOR (fn)
1398 3138491 : || TREE_CODE (fn) == TEMPLATE_DECL)
1399 : /* Member function templates and non-special member functions
1400 : coexist if they are not equivalently constrained. A member
1401 : function is not hidden by an inherited constructor. */
1402 2685426 : continue;
1403 :
1404 : /* P0848: For special member functions, deleted, unsatisfied, or
1405 : less constrained overloads are ineligible. We implement this
1406 : by removing them from CLASSTYPE_MEMBER_VEC. Destructors don't
1407 : use the notion of eligibility, and the selected destructor can
1408 : be deleted, but removing unsatisfied or less constrained
1409 : overloads has the same effect as overload resolution. */
1410 140029 : bool dtor = (sfk == sfk_destructor);
1411 140029 : if (losem == -1)
1412 277215 : losem = ((!dtor && DECL_DELETED_FN (method))
1413 276938 : || !constraints_satisfied_p (method));
1414 137742 : bool losef = ((!dtor && DECL_DELETED_FN (fn))
1415 149833 : || !constraints_satisfied_p (fn));
1416 140029 : int win;
1417 140029 : if (losem || losef)
1418 136332 : win = losem - losef;
1419 : else
1420 3697 : win = more_constrained (fn, method);
1421 140029 : if (win > 0)
1422 : /* Leave FN in the method vec, discard METHOD. */
1423 : return false;
1424 131032 : else if (win < 0)
1425 : {
1426 : /* Remove FN, add METHOD. */
1427 117978 : current_fns = iter.remove_node (current_fns);
1428 117978 : continue;
1429 : }
1430 : else
1431 : /* Let them coexist for now. */
1432 13054 : continue;
1433 : }
1434 :
1435 : /* If these are versions of the same function, process and
1436 : move on. */
1437 188183 : if (TREE_CODE (fn) == FUNCTION_DECL
1438 188156 : && maybe_version_functions (method, fn))
1439 27 : continue;
1440 :
1441 376258 : if (DECL_INHERITED_CTOR (method))
1442 : {
1443 6324 : if (!DECL_INHERITED_CTOR (fn))
1444 : /* Defer to the other function. */
1445 3090 : return false;
1446 :
1447 105 : tree basem = DECL_INHERITED_CTOR_BASE (method);
1448 210 : tree basef = DECL_INHERITED_CTOR_BASE (fn);
1449 105 : if (flag_new_inheriting_ctors)
1450 : {
1451 102 : if (basem == basef)
1452 : {
1453 : /* Inheriting the same constructor along different
1454 : paths, combine them. */
1455 90 : SET_DECL_INHERITED_CTOR
1456 : (fn, ovl_make (DECL_INHERITED_CTOR (method),
1457 : DECL_INHERITED_CTOR (fn)));
1458 : /* And discard the new one. */
1459 30 : return false;
1460 : }
1461 : else
1462 : /* Inherited ctors can coexist until overload
1463 : resolution. */
1464 72 : continue;
1465 : }
1466 :
1467 3 : auto_diagnostic_group d;
1468 3 : error_at (DECL_SOURCE_LOCATION (method),
1469 : "%q#D conflicts with version inherited from %qT",
1470 : method, basef);
1471 3 : inform (DECL_SOURCE_LOCATION (fn),
1472 : "version inherited from %qT declared here",
1473 : basef);
1474 3 : return false;
1475 3 : }
1476 :
1477 184967 : if (via_using)
1478 : /* Defer to the local function. */
1479 : return false;
1480 184955 : else if (iter.using_p ()
1481 184955 : || (flag_new_inheriting_ctors
1482 233410 : && DECL_INHERITED_CTOR (fn)))
1483 : {
1484 : /* Remove the inherited function. */
1485 184634 : current_fns = iter.remove_node (current_fns);
1486 184634 : continue;
1487 : }
1488 : else
1489 : {
1490 321 : auto_diagnostic_group d;
1491 321 : error_at (DECL_SOURCE_LOCATION (method),
1492 : "%q#D cannot be overloaded with %q#D", method, fn);
1493 321 : inform (DECL_SOURCE_LOCATION (fn),
1494 : "previous declaration %q#D", fn);
1495 321 : return false;
1496 321 : }
1497 : }
1498 :
1499 339790467 : current_fns = ovl_insert (method, current_fns, via_using);
1500 :
1501 614652939 : if (!COMPLETE_TYPE_P (type) && !DECL_CONV_FN_P (method)
1502 611996669 : && !push_class_level_binding (DECL_NAME (method), current_fns))
1503 : return false;
1504 :
1505 339790449 : if (!slot)
1506 149748707 : slot = add_member_slot (type, DECL_NAME (method));
1507 :
1508 : /* Maintain TYPE_HAS_USER_CONSTRUCTOR, etc. */
1509 339790449 : grok_special_member_properties (method);
1510 :
1511 339790449 : *slot = current_fns;
1512 :
1513 339790449 : return true;
1514 : }
1515 :
1516 : /* Subroutines of finish_struct. */
1517 :
1518 : /* Change the access of FDECL to ACCESS in T. Return 1 if change was
1519 : legit, otherwise return 0. */
1520 :
1521 : static int
1522 2920469 : alter_access (tree t, tree fdecl, tree access)
1523 : {
1524 2920469 : tree elem;
1525 :
1526 2920469 : retrofit_lang_decl (fdecl);
1527 :
1528 2920469 : gcc_assert (!DECL_DISCRIMINATOR_P (fdecl));
1529 :
1530 2920469 : elem = purpose_member (t, DECL_ACCESS (fdecl));
1531 2920469 : if (elem)
1532 : {
1533 0 : if (TREE_VALUE (elem) != access)
1534 : {
1535 0 : if (TREE_CODE (TREE_TYPE (fdecl)) == FUNCTION_DECL)
1536 0 : error ("conflicting access specifications for method"
1537 0 : " %q+D, ignored", TREE_TYPE (fdecl));
1538 : else
1539 0 : error ("conflicting access specifications for field %qE, ignored",
1540 0 : DECL_NAME (fdecl));
1541 : }
1542 : else
1543 : {
1544 : /* They're changing the access to the same thing they changed
1545 : it to before. That's OK. */
1546 : ;
1547 : }
1548 : }
1549 : else
1550 : {
1551 2920469 : perform_or_defer_access_check (TYPE_BINFO (t), fdecl, fdecl,
1552 : tf_warning_or_error);
1553 2920469 : DECL_ACCESS (fdecl) = tree_cons (t, access, DECL_ACCESS (fdecl));
1554 2920469 : return 1;
1555 : }
1556 : return 0;
1557 : }
1558 :
1559 : /* Return the access node for DECL's access in its enclosing class. */
1560 :
1561 : tree
1562 393554 : declared_access (tree decl)
1563 : {
1564 393554 : return (TREE_PRIVATE (decl) ? access_private_node
1565 383707 : : TREE_PROTECTED (decl) ? access_protected_node
1566 393554 : : access_public_node);
1567 : }
1568 :
1569 : /* If DECL is a non-dependent using of non-ctor function members, push them
1570 : and return true, otherwise return false. Called from
1571 : finish_member_declaration. */
1572 :
1573 : bool
1574 187507151 : maybe_push_used_methods (tree decl)
1575 : {
1576 187507151 : if (TREE_CODE (decl) != USING_DECL)
1577 : return false;
1578 3089274 : tree used = strip_using_decl (decl);
1579 3089274 : if (!used || !is_overloaded_fn (used))
1580 : return false;
1581 :
1582 : /* Add the functions to CLASSTYPE_MEMBER_VEC so that overload resolution
1583 : works within the class body. */
1584 6000272 : for (tree f : ovl_range (used))
1585 : {
1586 5657922 : if (DECL_CONSTRUCTOR_P (f))
1587 : /* Inheriting constructors are handled separately. */
1588 101698 : return false;
1589 :
1590 2727263 : bool added = add_method (current_class_type, f, true);
1591 :
1592 2727263 : if (added)
1593 2727242 : alter_access (current_class_type, f, current_access_specifier);
1594 :
1595 : /* If add_method returns false because f was already declared, look
1596 : for a duplicate using-declaration. */
1597 : else
1598 72 : for (tree d = TYPE_FIELDS (current_class_type); d; d = DECL_CHAIN (d))
1599 57 : if (TREE_CODE (d) == USING_DECL
1600 24 : && DECL_NAME (d) == DECL_NAME (decl)
1601 66 : && same_type_p (USING_DECL_SCOPE (d), USING_DECL_SCOPE (decl)))
1602 : {
1603 6 : diagnose_name_conflict (decl, d);
1604 6 : break;
1605 : }
1606 : }
1607 1744403 : return true;
1608 : }
1609 :
1610 : /* Process the USING_DECL, which is a member of T. */
1611 :
1612 : static void
1613 2119439 : handle_using_decl (tree using_decl, tree t)
1614 : {
1615 2119439 : tree decl = USING_DECL_DECLS (using_decl);
1616 :
1617 2119439 : gcc_assert (!processing_template_decl && decl);
1618 :
1619 2119439 : cp_emit_debug_info_for_using (decl, t);
1620 :
1621 2119439 : if (is_overloaded_fn (decl))
1622 : /* Handled in maybe_push_used_methods. */
1623 2119439 : return;
1624 :
1625 375202 : tree name = DECL_NAME (using_decl);
1626 375202 : tree old_value = lookup_member (t, name, /*protect=*/0, /*want_type=*/false,
1627 : tf_warning_or_error);
1628 375202 : if (old_value)
1629 : {
1630 375202 : old_value = OVL_FIRST (old_value);
1631 :
1632 375202 : if (DECL_P (old_value) && DECL_CONTEXT (old_value) == t)
1633 : /* OK */;
1634 : else
1635 : old_value = NULL_TREE;
1636 : }
1637 :
1638 0 : if (! old_value)
1639 : ;
1640 0 : else if (is_overloaded_fn (old_value))
1641 : {
1642 0 : auto_diagnostic_group d;
1643 0 : error_at (DECL_SOURCE_LOCATION (using_decl), "%qD invalid in %q#T "
1644 : "because of local method %q#D with same name",
1645 : using_decl, t, old_value);
1646 0 : inform (DECL_SOURCE_LOCATION (old_value),
1647 : "local method %q#D declared here", old_value);
1648 0 : return;
1649 0 : }
1650 0 : else if (!DECL_ARTIFICIAL (old_value))
1651 : {
1652 0 : auto_diagnostic_group d;
1653 0 : error_at (DECL_SOURCE_LOCATION (using_decl), "%qD invalid in %q#T "
1654 : "because of local member %q#D with same name",
1655 : using_decl, t, old_value);
1656 0 : inform (DECL_SOURCE_LOCATION (old_value),
1657 : "local member %q#D declared here", old_value);
1658 0 : return;
1659 0 : }
1660 :
1661 375202 : iloc_sentinel ils (DECL_SOURCE_LOCATION (using_decl));
1662 375202 : tree access = declared_access (using_decl);
1663 :
1664 : /* Make type T see field decl FDECL with access ACCESS. */
1665 375202 : if (USING_DECL_UNRELATED_P (using_decl))
1666 : {
1667 : /* C++20 using enum can import non-inherited enumerators into class
1668 : scope. We implement that by making a copy of the CONST_DECL for which
1669 : CONST_DECL_USING_P is true. */
1670 181975 : gcc_assert (TREE_CODE (decl) == CONST_DECL);
1671 :
1672 181975 : auto cas = make_temp_override (current_access_specifier, access);
1673 181975 : tree copy = copy_decl (decl);
1674 181975 : DECL_CONTEXT (copy) = t;
1675 181975 : DECL_ARTIFICIAL (copy) = true;
1676 : /* We emitted debug info for the USING_DECL above; make sure we don't
1677 : also emit anything for this clone. */
1678 181975 : DECL_IGNORED_P (copy) = true;
1679 181975 : DECL_SOURCE_LOCATION (copy) = DECL_SOURCE_LOCATION (using_decl);
1680 181975 : finish_member_declaration (copy);
1681 181975 : DECL_ABSTRACT_ORIGIN (copy) = decl;
1682 181975 : }
1683 : else
1684 193227 : alter_access (t, decl, access);
1685 375202 : }
1686 :
1687 : /* Data structure for find_abi_tags_r, below. */
1688 :
1689 : struct abi_tag_data
1690 : {
1691 : tree t; // The type that we're checking for missing tags.
1692 : tree subob; // The subobject of T that we're getting tags from.
1693 : tree tags; // error_mark_node for diagnostics, or a list of missing tags.
1694 : };
1695 :
1696 : /* Subroutine of find_abi_tags_r. Handle a single TAG found on the class TP
1697 : in the context of P. TAG can be either an identifier (the DECL_NAME of
1698 : a tag NAMESPACE_DECL) or a STRING_CST (a tag attribute). */
1699 :
1700 : static void
1701 16758144 : check_tag (tree tag, tree id, tree *tp, abi_tag_data *p)
1702 : {
1703 16758144 : if (!IDENTIFIER_MARKED (id))
1704 : {
1705 5731655 : if (p->tags != error_mark_node)
1706 : {
1707 : /* We're collecting tags from template arguments or from
1708 : the type of a variable or function return type. */
1709 5731637 : p->tags = tree_cons (NULL_TREE, tag, p->tags);
1710 :
1711 : /* Don't inherit this tag multiple times. */
1712 5731637 : IDENTIFIER_MARKED (id) = true;
1713 :
1714 5731637 : ABI_TAG_INHERITED (p->tags) = true;
1715 5731637 : if (TYPE_P (p->t))
1716 : {
1717 : /* Tags inherited from type template arguments are only used
1718 : to avoid warnings. */
1719 5688441 : ABI_TAG_NOT_MANGLED (p->tags) = true;
1720 5688441 : return;
1721 : }
1722 : /* For functions and variables we want to warn, too. */
1723 : }
1724 :
1725 : /* Otherwise we're diagnosing missing tags. */
1726 43214 : if (TREE_CODE (p->t) == FUNCTION_DECL)
1727 : {
1728 42801 : auto_diagnostic_group d;
1729 42801 : if (warning (OPT_Wabi_tag, "%qD inherits the %E ABI tag "
1730 : "that %qT (used in its return type) has",
1731 : p->t, tag, *tp))
1732 3 : inform (location_of (*tp), "%qT declared here", *tp);
1733 42801 : }
1734 413 : else if (VAR_P (p->t))
1735 : {
1736 395 : auto_diagnostic_group d;
1737 395 : if (warning (OPT_Wabi_tag, "%qD inherits the %E ABI tag "
1738 : "that %qT (used in its type) has", p->t, tag, *tp))
1739 3 : inform (location_of (*tp), "%qT declared here", *tp);
1740 395 : }
1741 18 : else if (TYPE_P (p->subob))
1742 : {
1743 6 : auto_diagnostic_group d;
1744 6 : if (warning (OPT_Wabi_tag, "%qT does not have the %E ABI tag "
1745 : "that base %qT has", p->t, tag, p->subob))
1746 6 : inform (location_of (p->subob), "%qT declared here",
1747 : p->subob);
1748 6 : }
1749 : else
1750 : {
1751 12 : auto_diagnostic_group d;
1752 12 : if (warning (OPT_Wabi_tag, "%qT does not have the %E ABI tag "
1753 : "that %qT (used in the type of %qD) has",
1754 : p->t, tag, *tp, p->subob))
1755 : {
1756 12 : inform (location_of (p->subob), "%qD declared here",
1757 : p->subob);
1758 12 : inform (location_of (*tp), "%qT declared here", *tp);
1759 : }
1760 12 : }
1761 : }
1762 : }
1763 :
1764 : /* Find all the ABI tags in the attribute list ATTR and either call
1765 : check_tag (if TP is non-null) or set IDENTIFIER_MARKED to val. */
1766 :
1767 : static void
1768 2476948856 : mark_or_check_attr_tags (tree attr, tree *tp, abi_tag_data *p, bool val)
1769 : {
1770 2476948856 : if (!attr)
1771 : return;
1772 293648280 : for (; (attr = lookup_attribute ("abi_tag", attr));
1773 102694503 : attr = TREE_CHAIN (attr))
1774 205389036 : for (tree list = TREE_VALUE (attr); list;
1775 102694533 : list = TREE_CHAIN (list))
1776 : {
1777 102694533 : tree tag = TREE_VALUE (list);
1778 102694533 : tree id = get_identifier (TREE_STRING_POINTER (tag));
1779 102694533 : if (tp)
1780 16758144 : check_tag (tag, id, tp, p);
1781 : else
1782 85936389 : IDENTIFIER_MARKED (id) = val;
1783 : }
1784 : }
1785 :
1786 : /* Find all the ABI tags on T and its enclosing scopes and either call
1787 : check_tag (if TP is non-null) or set IDENTIFIER_MARKED to val. */
1788 :
1789 : static void
1790 919724537 : mark_or_check_tags (tree t, tree *tp, abi_tag_data *p, bool val)
1791 : {
1792 3396673393 : while (t != global_namespace)
1793 : {
1794 2476948856 : tree attr;
1795 2476948856 : if (TYPE_P (t))
1796 : {
1797 915709191 : attr = TYPE_ATTRIBUTES (t);
1798 915709191 : t = CP_TYPE_CONTEXT (t);
1799 : }
1800 : else
1801 : {
1802 1561239665 : attr = DECL_ATTRIBUTES (t);
1803 1561239665 : t = CP_DECL_CONTEXT (t);
1804 : }
1805 2476948856 : mark_or_check_attr_tags (attr, tp, p, val);
1806 : }
1807 919724537 : }
1808 :
1809 : /* walk_tree callback for check_abi_tags: if the type at *TP involves any
1810 : types with ABI tags, add the corresponding identifiers to the VEC in
1811 : *DATA and set IDENTIFIER_MARKED. */
1812 :
1813 : static tree
1814 764538594 : find_abi_tags_r (tree *tp, int *walk_subtrees, void *data)
1815 : {
1816 764538594 : if (TYPE_P (*tp) && *walk_subtrees == 1 && flag_abi_version != 14)
1817 : /* Tell cp_walk_subtrees to look though typedefs. [PR98481] */
1818 493769842 : *walk_subtrees = 2;
1819 :
1820 764538594 : if (!OVERLOAD_TYPE_P (*tp))
1821 : return NULL_TREE;
1822 :
1823 : /* walk_tree shouldn't be walking into any subtrees of a RECORD_TYPE
1824 : anyway, but let's make sure of it. */
1825 138840683 : *walk_subtrees = false;
1826 :
1827 138840683 : abi_tag_data *p = static_cast<struct abi_tag_data*>(data);
1828 :
1829 138840683 : mark_or_check_tags (*tp, tp, p, false);
1830 :
1831 138840683 : return NULL_TREE;
1832 : }
1833 :
1834 : /* walk_tree callback for mark_abi_tags: if *TP is a class, set
1835 : IDENTIFIER_MARKED on its ABI tags. */
1836 :
1837 : static tree
1838 1296528214 : mark_abi_tags_r (tree *tp, int *walk_subtrees, void *data)
1839 : {
1840 1296528214 : if (TYPE_P (*tp) && *walk_subtrees == 1 && flag_abi_version != 14)
1841 : /* Tell cp_walk_subtrees to look though typedefs. */
1842 920919240 : *walk_subtrees = 2;
1843 :
1844 1296528214 : if (!OVERLOAD_TYPE_P (*tp))
1845 : return NULL_TREE;
1846 :
1847 : /* walk_tree shouldn't be walking into any subtrees of a RECORD_TYPE
1848 : anyway, but let's make sure of it. */
1849 175962504 : *walk_subtrees = false;
1850 :
1851 175962504 : bool *valp = static_cast<bool*>(data);
1852 :
1853 175962504 : mark_or_check_tags (*tp, NULL, NULL, *valp);
1854 :
1855 175962504 : return NULL_TREE;
1856 : }
1857 :
1858 : /* Set IDENTIFIER_MARKED on all the ABI tags on T and its enclosing
1859 : scopes. */
1860 :
1861 : static void
1862 604921350 : mark_abi_tags (tree t, bool val)
1863 : {
1864 604921350 : mark_or_check_tags (t, NULL, NULL, val);
1865 604921350 : if (DECL_P (t))
1866 : {
1867 782335858 : if (DECL_LANG_SPECIFIC (t) && DECL_USE_TEMPLATE (t)
1868 674744270 : && PRIMARY_TEMPLATE_P (DECL_TI_TEMPLATE (t)))
1869 : {
1870 : /* Template arguments are part of the signature. */
1871 30696430 : tree level = INNERMOST_TEMPLATE_ARGS (DECL_TI_ARGS (t));
1872 76564818 : for (int j = 0; j < TREE_VEC_LENGTH (level); ++j)
1873 : {
1874 45868388 : tree arg = TREE_VEC_ELT (level, j);
1875 45868388 : cp_walk_tree_without_duplicates (&arg, mark_abi_tags_r, &val);
1876 : }
1877 : }
1878 392411596 : if (TREE_CODE (t) == FUNCTION_DECL)
1879 : /* A function's parameter types are part of the signature, so
1880 : we don't need to inherit any tags that are also in them. */
1881 1007808412 : for (tree arg = FUNCTION_FIRST_USER_PARMTYPE (t); arg;
1882 677445672 : arg = TREE_CHAIN (arg))
1883 677445672 : cp_walk_tree_without_duplicates (&TREE_VALUE (arg),
1884 : mark_abi_tags_r, &val);
1885 : }
1886 604921350 : }
1887 :
1888 : /* Check that T has all the ABI tags that subobject SUBOB has, or
1889 : warn if not. If T is a (variable or function) declaration, also
1890 : return any missing tags, and add them to T if JUST_CHECKING is false. */
1891 :
1892 : static tree
1893 237089944 : check_abi_tags (tree t, tree subob, bool just_checking = false)
1894 : {
1895 237089944 : bool inherit = DECL_P (t);
1896 :
1897 237089944 : if (!inherit && !warn_abi_tag)
1898 : return NULL_TREE;
1899 :
1900 196383999 : tree decl = TYPE_P (t) ? TYPE_NAME (t) : t;
1901 196383999 : if (!TREE_PUBLIC (decl))
1902 : /* No need to worry about things local to this TU. */
1903 : return NULL_TREE;
1904 :
1905 196205819 : mark_abi_tags (t, true);
1906 :
1907 196205819 : tree subtype = TYPE_P (subob) ? subob : TREE_TYPE (subob);
1908 196205819 : struct abi_tag_data data = { t, subob, error_mark_node };
1909 196205819 : if (inherit)
1910 196205798 : data.tags = NULL_TREE;
1911 :
1912 196205819 : cp_walk_tree_without_duplicates (&subtype, find_abi_tags_r, &data);
1913 :
1914 196205819 : if (!(inherit && data.tags))
1915 : /* We don't need to do anything with data.tags. */;
1916 43181 : else if (just_checking)
1917 75 : for (tree t = data.tags; t; t = TREE_CHAIN (t))
1918 : {
1919 42 : tree id = get_identifier (TREE_STRING_POINTER (TREE_VALUE (t)));
1920 42 : IDENTIFIER_MARKED (id) = false;
1921 : }
1922 : else
1923 : {
1924 43148 : tree attr = lookup_attribute ("abi_tag", DECL_ATTRIBUTES (t));
1925 43148 : if (attr)
1926 0 : TREE_VALUE (attr) = chainon (data.tags, TREE_VALUE (attr));
1927 : else
1928 43148 : DECL_ATTRIBUTES (t)
1929 86296 : = tree_cons (abi_tag_identifier, data.tags, DECL_ATTRIBUTES (t));
1930 : }
1931 :
1932 196205819 : mark_abi_tags (t, false);
1933 :
1934 196205819 : return data.tags;
1935 : }
1936 :
1937 : /* Check that DECL has all the ABI tags that are used in parts of its type
1938 : that are not reflected in its mangled name. */
1939 :
1940 : void
1941 208941439 : check_abi_tags (tree decl)
1942 : {
1943 208941439 : if (VAR_P (decl))
1944 31131588 : check_abi_tags (decl, TREE_TYPE (decl));
1945 177809851 : else if (TREE_CODE (decl) == FUNCTION_DECL
1946 177806531 : && !DECL_CONV_FN_P (decl)
1947 352993127 : && !mangle_return_type_p (decl))
1948 165168826 : check_abi_tags (decl, TREE_TYPE (TREE_TYPE (decl)));
1949 208941439 : }
1950 :
1951 : /* Return any ABI tags that are used in parts of the type of DECL
1952 : that are not reflected in its mangled name. This function is only
1953 : used in backward-compatible mangling for ABI <11. */
1954 :
1955 : tree
1956 84289 : missing_abi_tags (tree decl)
1957 : {
1958 84289 : if (VAR_P (decl))
1959 1114 : return check_abi_tags (decl, TREE_TYPE (decl), true);
1960 83175 : else if (TREE_CODE (decl) == FUNCTION_DECL
1961 : /* Don't check DECL_CONV_FN_P here like we do in check_abi_tags, so
1962 : that we can use this function for setting need_abi_warning
1963 : regardless of the current flag_abi_version. */
1964 83175 : && !mangle_return_type_p (decl))
1965 82447 : return check_abi_tags (decl, TREE_TYPE (TREE_TYPE (decl)), true);
1966 : else
1967 728 : return NULL_TREE;
1968 : }
1969 :
1970 : void
1971 106613129 : inherit_targ_abi_tags (tree t)
1972 : {
1973 106254856 : if (!CLASS_TYPE_P (t)
1974 212867985 : || CLASSTYPE_TEMPLATE_INFO (t) == NULL_TREE)
1975 358273 : return;
1976 :
1977 106254856 : mark_abi_tags (t, true);
1978 :
1979 106254856 : tree args = CLASSTYPE_TI_ARGS (t);
1980 106254856 : struct abi_tag_data data = { t, NULL_TREE, NULL_TREE };
1981 637529318 : for (int i = 0; i < TMPL_ARGS_DEPTH (args); ++i)
1982 : {
1983 217651648 : tree level = TMPL_ARGS_LEVEL (args, i+1);
1984 299390138 : for (int j = 0; j < TREE_VEC_LENGTH (level); ++j)
1985 : {
1986 190564314 : tree arg = TREE_VEC_ELT (level, j);
1987 190564314 : data.subob = arg;
1988 190564314 : cp_walk_tree_without_duplicates (&arg, find_abi_tags_r, &data);
1989 : }
1990 : }
1991 :
1992 : // If we found some tags on our template arguments, add them to our
1993 : // abi_tag attribute.
1994 106254856 : if (data.tags)
1995 : {
1996 5688441 : tree attr = lookup_attribute ("abi_tag", TYPE_ATTRIBUTES (t));
1997 5688441 : if (attr)
1998 3 : TREE_VALUE (attr) = chainon (data.tags, TREE_VALUE (attr));
1999 : else
2000 5688438 : TYPE_ATTRIBUTES (t)
2001 11376876 : = tree_cons (abi_tag_identifier, data.tags, TYPE_ATTRIBUTES (t));
2002 : }
2003 :
2004 106254856 : mark_abi_tags (t, false);
2005 : }
2006 :
2007 : /* Return true, iff class T has a non-virtual destructor that is
2008 : accessible from outside the class heirarchy (i.e. is public, or
2009 : there's a suitable friend. */
2010 :
2011 : static bool
2012 99 : accessible_nvdtor_p (tree t)
2013 : {
2014 99 : tree dtor = CLASSTYPE_DESTRUCTOR (t);
2015 :
2016 : /* An implicitly declared destructor is always public. And,
2017 : if it were virtual, we would have created it by now. */
2018 99 : if (!dtor)
2019 : return true;
2020 :
2021 78 : if (DECL_VINDEX (dtor))
2022 : return false; /* Virtual */
2023 :
2024 42 : if (!TREE_PRIVATE (dtor) && !TREE_PROTECTED (dtor))
2025 : return true; /* Public */
2026 :
2027 30 : if (CLASSTYPE_FRIEND_CLASSES (t)
2028 30 : || DECL_FRIENDLIST (TYPE_MAIN_DECL (t)))
2029 12 : return true; /* Has friends */
2030 :
2031 : return false;
2032 : }
2033 :
2034 : /* Run through the base classes of T, updating CANT_HAVE_CONST_CTOR_P,
2035 : and NO_CONST_ASN_REF_P. Also set flag bits in T based on
2036 : properties of the bases. */
2037 :
2038 : static void
2039 49090220 : check_bases (tree t,
2040 : int* cant_have_const_ctor_p,
2041 : int* no_const_asn_ref_p)
2042 : {
2043 49090220 : int i;
2044 49090220 : bool seen_non_virtual_nearly_empty_base_p = 0;
2045 49090220 : int seen_tm_mask = 0;
2046 49090220 : tree base_binfo;
2047 49090220 : tree binfo;
2048 49090220 : tree field = NULL_TREE;
2049 :
2050 49090220 : if (!CLASSTYPE_NON_STD_LAYOUT (t))
2051 221798525 : for (field = TYPE_FIELDS (t); field; field = DECL_CHAIN (field))
2052 179399261 : if (TREE_CODE (field) == FIELD_DECL)
2053 : break;
2054 :
2055 72438305 : for (binfo = TYPE_BINFO (t), i = 0;
2056 72438305 : BINFO_BASE_ITERATE (binfo, i, base_binfo); i++)
2057 : {
2058 23348085 : tree basetype = TREE_TYPE (base_binfo);
2059 :
2060 23348085 : gcc_assert (COMPLETE_TYPE_P (basetype));
2061 :
2062 23348085 : if (CLASSTYPE_FINAL (basetype))
2063 14 : error ("cannot derive from %<final%> base %qT in derived type %qT",
2064 : basetype, t);
2065 :
2066 : /* If any base class is non-literal, so is the derived class. */
2067 23348085 : if (!CLASSTYPE_LITERAL_P (basetype))
2068 1658602 : CLASSTYPE_LITERAL_P (t) = false;
2069 :
2070 : /* If the base class doesn't have copy constructors or
2071 : assignment operators that take const references, then the
2072 : derived class cannot have such a member automatically
2073 : generated. */
2074 23348085 : if (TYPE_HAS_COPY_CTOR (basetype)
2075 23348085 : && ! TYPE_HAS_CONST_COPY_CTOR (basetype))
2076 60 : *cant_have_const_ctor_p = 1;
2077 23348085 : if (TYPE_HAS_COPY_ASSIGN (basetype)
2078 23348085 : && !TYPE_HAS_CONST_COPY_ASSIGN (basetype))
2079 18 : *no_const_asn_ref_p = 1;
2080 :
2081 23348085 : if (BINFO_VIRTUAL_P (base_binfo))
2082 : /* A virtual base does not effect nearly emptiness. */
2083 : ;
2084 23302080 : else if (CLASSTYPE_NEARLY_EMPTY_P (basetype))
2085 : {
2086 265371 : if (seen_non_virtual_nearly_empty_base_p)
2087 : /* And if there is more than one nearly empty base, then the
2088 : derived class is not nearly empty either. */
2089 1084 : CLASSTYPE_NEARLY_EMPTY_P (t) = 0;
2090 : else
2091 : /* Remember we've seen one. */
2092 : seen_non_virtual_nearly_empty_base_p = 1;
2093 : }
2094 23036709 : else if (!is_empty_class (basetype))
2095 : /* If the base class is not empty or nearly empty, then this
2096 : class cannot be nearly empty. */
2097 2088100 : CLASSTYPE_NEARLY_EMPTY_P (t) = 0;
2098 :
2099 : /* A lot of properties from the bases also apply to the derived
2100 : class. */
2101 23348085 : TYPE_NEEDS_CONSTRUCTING (t) |= TYPE_NEEDS_CONSTRUCTING (basetype);
2102 70044255 : TYPE_HAS_NONTRIVIAL_DESTRUCTOR (t)
2103 23348085 : |= TYPE_HAS_NONTRIVIAL_DESTRUCTOR (basetype);
2104 23348085 : TYPE_HAS_COMPLEX_COPY_ASSIGN (t)
2105 23348085 : |= (TYPE_HAS_COMPLEX_COPY_ASSIGN (basetype)
2106 23348085 : || !TYPE_HAS_COPY_ASSIGN (basetype));
2107 46696170 : TYPE_HAS_COMPLEX_COPY_CTOR (t) |= (TYPE_HAS_COMPLEX_COPY_CTOR (basetype)
2108 23348085 : || !TYPE_HAS_COPY_CTOR (basetype));
2109 70044255 : TYPE_HAS_COMPLEX_MOVE_ASSIGN (t)
2110 23348085 : |= TYPE_HAS_COMPLEX_MOVE_ASSIGN (basetype);
2111 23348085 : TYPE_HAS_COMPLEX_MOVE_CTOR (t) |= TYPE_HAS_COMPLEX_MOVE_CTOR (basetype);
2112 23348085 : TYPE_POLYMORPHIC_P (t) |= TYPE_POLYMORPHIC_P (basetype);
2113 70044255 : CLASSTYPE_CONTAINS_EMPTY_CLASS_P (t)
2114 23348085 : |= CLASSTYPE_CONTAINS_EMPTY_CLASS_P (basetype);
2115 46696170 : TYPE_HAS_COMPLEX_DFLT (t) |= (!TYPE_HAS_DEFAULT_CONSTRUCTOR (basetype)
2116 23348085 : || TYPE_HAS_COMPLEX_DFLT (basetype));
2117 23348085 : SET_CLASSTYPE_READONLY_FIELDS_NEED_INIT
2118 : (t, CLASSTYPE_READONLY_FIELDS_NEED_INIT (t)
2119 : | CLASSTYPE_READONLY_FIELDS_NEED_INIT (basetype));
2120 23348085 : SET_CLASSTYPE_REF_FIELDS_NEED_INIT
2121 : (t, CLASSTYPE_REF_FIELDS_NEED_INIT (t)
2122 : | CLASSTYPE_REF_FIELDS_NEED_INIT (basetype));
2123 23348085 : if (TYPE_HAS_MUTABLE_P (basetype))
2124 955730 : CLASSTYPE_HAS_MUTABLE (t) = 1;
2125 :
2126 : /* A standard-layout class is a class that:
2127 : ...
2128 : * has no non-standard-layout base classes, */
2129 23348085 : CLASSTYPE_NON_STD_LAYOUT (t) |= CLASSTYPE_NON_STD_LAYOUT (basetype);
2130 23348085 : if (!CLASSTYPE_NON_STD_LAYOUT (t))
2131 : {
2132 21443141 : tree basefield;
2133 : /* ...has no base classes of the same type as the first non-static
2134 : data member... */
2135 500984 : if (field && DECL_CONTEXT (field) == t
2136 21890908 : && (same_type_ignoring_top_level_qualifiers_p
2137 447767 : (TREE_TYPE (field), basetype)))
2138 129 : CLASSTYPE_NON_STD_LAYOUT (t) = 1;
2139 : /* DR 1813:
2140 : ...has at most one base class subobject of any given type... */
2141 21443012 : else if (CLASSTYPE_REPEATED_BASE_P (t))
2142 376 : CLASSTYPE_NON_STD_LAYOUT (t) = 1;
2143 : else
2144 : /* ...has all non-static data members and bit-fields in the class
2145 : and its base classes first declared in the same class. */
2146 308961038 : for (basefield = TYPE_FIELDS (basetype); basefield;
2147 287518402 : basefield = DECL_CHAIN (basefield))
2148 288447164 : if (TREE_CODE (basefield) == FIELD_DECL
2149 289743146 : && !(DECL_FIELD_IS_BASE (basefield)
2150 1295982 : && is_empty_field (basefield)))
2151 : {
2152 928762 : if (field)
2153 126410 : CLASSTYPE_NON_STD_LAYOUT (t) = 1;
2154 : else
2155 : field = basefield;
2156 : break;
2157 : }
2158 : }
2159 :
2160 : /* Don't bother collecting tm attributes if transactional memory
2161 : support is not enabled. */
2162 23348085 : if (flag_tm)
2163 : {
2164 1575 : tree tm_attr = find_tm_attribute (TYPE_ATTRIBUTES (basetype));
2165 1575 : if (tm_attr)
2166 15 : seen_tm_mask |= tm_attr_to_mask (tm_attr);
2167 : }
2168 :
2169 23348085 : check_abi_tags (t, basetype);
2170 : }
2171 :
2172 : /* If one of the base classes had TM attributes, and the current class
2173 : doesn't define its own, then the current class inherits one. */
2174 49090220 : if (seen_tm_mask && !find_tm_attribute (TYPE_ATTRIBUTES (t)))
2175 : {
2176 12 : tree tm_attr = tm_mask_to_attr (least_bit_hwi (seen_tm_mask));
2177 12 : TYPE_ATTRIBUTES (t) = tree_cons (tm_attr, NULL, TYPE_ATTRIBUTES (t));
2178 : }
2179 49090220 : }
2180 :
2181 : /* Determine all the primary bases within T. Sets BINFO_PRIMARY_BASE_P for
2182 : those that are primaries. Sets BINFO_LOST_PRIMARY_P for those
2183 : that have had a nearly-empty virtual primary base stolen by some
2184 : other base in the hierarchy. Determines CLASSTYPE_PRIMARY_BASE for
2185 : T. */
2186 :
2187 : static void
2188 49090220 : determine_primary_bases (tree t)
2189 : {
2190 49090220 : unsigned i;
2191 49090220 : tree primary = NULL_TREE;
2192 49090220 : tree type_binfo = TYPE_BINFO (t);
2193 49090220 : tree base_binfo;
2194 :
2195 : /* Determine the primary bases of our bases. */
2196 76138319 : for (base_binfo = TREE_CHAIN (type_binfo); base_binfo;
2197 27048099 : base_binfo = TREE_CHAIN (base_binfo))
2198 : {
2199 27048099 : tree primary = CLASSTYPE_PRIMARY_BINFO (BINFO_TYPE (base_binfo));
2200 :
2201 : /* See if we're the non-virtual primary of our inheritance
2202 : chain. */
2203 27048099 : if (!BINFO_VIRTUAL_P (base_binfo))
2204 : {
2205 26856079 : tree parent = BINFO_INHERITANCE_CHAIN (base_binfo);
2206 26856079 : tree parent_primary = CLASSTYPE_PRIMARY_BINFO (BINFO_TYPE (parent));
2207 :
2208 26856079 : if (parent_primary
2209 26856079 : && SAME_BINFO_TYPE_P (BINFO_TYPE (base_binfo),
2210 : BINFO_TYPE (parent_primary)))
2211 : /* We are the primary binfo. */
2212 1084235 : BINFO_PRIMARY_P (base_binfo) = 1;
2213 : }
2214 : /* Determine if we have a virtual primary base, and mark it so.
2215 : */
2216 28139469 : if (primary && BINFO_VIRTUAL_P (primary))
2217 : {
2218 7135 : tree this_primary = copied_binfo (primary, base_binfo);
2219 :
2220 7135 : if (BINFO_PRIMARY_P (this_primary))
2221 : /* Someone already claimed this base. */
2222 636 : BINFO_LOST_PRIMARY_P (base_binfo) = 1;
2223 : else
2224 : {
2225 6499 : tree delta;
2226 :
2227 6499 : BINFO_PRIMARY_P (this_primary) = 1;
2228 6499 : BINFO_INHERITANCE_CHAIN (this_primary) = base_binfo;
2229 :
2230 : /* A virtual binfo might have been copied from within
2231 : another hierarchy. As we're about to use it as a
2232 : primary base, make sure the offsets match. */
2233 6499 : delta = size_diffop_loc (input_location,
2234 6499 : fold_convert (ssizetype,
2235 : BINFO_OFFSET (base_binfo)),
2236 6499 : fold_convert (ssizetype,
2237 : BINFO_OFFSET (this_primary)));
2238 :
2239 6499 : propagate_binfo_offsets (this_primary, delta);
2240 : }
2241 : }
2242 : }
2243 :
2244 : /* First look for a dynamic direct non-virtual base. */
2245 70789921 : for (i = 0; BINFO_BASE_ITERATE (type_binfo, i, base_binfo); i++)
2246 : {
2247 23164803 : tree basetype = BINFO_TYPE (base_binfo);
2248 :
2249 23164803 : if (TYPE_CONTAINS_VPTR_P (basetype) && !BINFO_VIRTUAL_P (base_binfo))
2250 : {
2251 1465102 : primary = base_binfo;
2252 1465102 : goto found;
2253 : }
2254 : }
2255 :
2256 : /* A "nearly-empty" virtual base class can be the primary base
2257 : class, if no non-virtual polymorphic base can be found. Look for
2258 : a nearly-empty virtual dynamic base that is not already a primary
2259 : base of something in the hierarchy. If there is no such base,
2260 : just pick the first nearly-empty virtual base. */
2261 :
2262 71386765 : for (base_binfo = TREE_CHAIN (type_binfo); base_binfo;
2263 23761647 : base_binfo = TREE_CHAIN (base_binfo))
2264 23763215 : if (BINFO_VIRTUAL_P (base_binfo)
2265 23763215 : && CLASSTYPE_NEARLY_EMPTY_P (BINFO_TYPE (base_binfo)))
2266 : {
2267 1701 : if (!BINFO_PRIMARY_P (base_binfo))
2268 : {
2269 : /* Found one that is not primary. */
2270 1568 : primary = base_binfo;
2271 1568 : goto found;
2272 : }
2273 133 : else if (!primary)
2274 : /* Remember the first candidate. */
2275 23761647 : primary = base_binfo;
2276 : }
2277 :
2278 47623550 : found:
2279 : /* If we've got a primary base, use it. */
2280 49090220 : if (primary)
2281 : {
2282 1466751 : tree basetype = BINFO_TYPE (primary);
2283 :
2284 1466751 : CLASSTYPE_PRIMARY_BINFO (t) = primary;
2285 1466751 : if (BINFO_PRIMARY_P (primary))
2286 : /* We are stealing a primary base. */
2287 81 : BINFO_LOST_PRIMARY_P (BINFO_INHERITANCE_CHAIN (primary)) = 1;
2288 1466751 : BINFO_PRIMARY_P (primary) = 1;
2289 1466751 : if (BINFO_VIRTUAL_P (primary))
2290 : {
2291 1649 : tree delta;
2292 :
2293 1649 : BINFO_INHERITANCE_CHAIN (primary) = type_binfo;
2294 : /* A virtual binfo might have been copied from within
2295 : another hierarchy. As we're about to use it as a primary
2296 : base, make sure the offsets match. */
2297 1649 : delta = size_diffop_loc (input_location, ssize_int (0),
2298 1649 : fold_convert (ssizetype, BINFO_OFFSET (primary)));
2299 :
2300 1649 : propagate_binfo_offsets (primary, delta);
2301 : }
2302 :
2303 1466751 : primary = TYPE_BINFO (basetype);
2304 :
2305 1466751 : TYPE_VFIELD (t) = TYPE_VFIELD (basetype);
2306 1466751 : BINFO_VTABLE (type_binfo) = BINFO_VTABLE (primary);
2307 1466751 : BINFO_VIRTUALS (type_binfo) = BINFO_VIRTUALS (primary);
2308 : }
2309 49090220 : }
2310 :
2311 : /* Update the variant types of T. */
2312 :
2313 : void
2314 159301673 : fixup_type_variants (tree type)
2315 : {
2316 159301673 : if (!type)
2317 : return;
2318 :
2319 159301673 : for (tree variant = TYPE_NEXT_VARIANT (type);
2320 319964409 : variant;
2321 160662736 : variant = TYPE_NEXT_VARIANT (variant))
2322 : {
2323 : /* These fields are in the _TYPE part of the node, not in
2324 : the TYPE_LANG_SPECIFIC component, so they are not shared. */
2325 160662736 : TYPE_HAS_USER_CONSTRUCTOR (variant) = TYPE_HAS_USER_CONSTRUCTOR (type);
2326 160662736 : TYPE_NEEDS_CONSTRUCTING (variant) = TYPE_NEEDS_CONSTRUCTING (type);
2327 321325472 : TYPE_HAS_NONTRIVIAL_DESTRUCTOR (variant)
2328 160662736 : = TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type);
2329 :
2330 160662736 : TYPE_POLYMORPHIC_P (variant) = TYPE_POLYMORPHIC_P (type);
2331 160662736 : CLASSTYPE_FINAL (variant) = CLASSTYPE_FINAL (type);
2332 :
2333 160662736 : TYPE_BINFO (variant) = TYPE_BINFO (type);
2334 :
2335 : /* Copy whatever these are holding today. */
2336 160662736 : TYPE_VFIELD (variant) = TYPE_VFIELD (type);
2337 160662736 : TYPE_FIELDS (variant) = TYPE_FIELDS (type);
2338 :
2339 160662736 : TYPE_SIZE (variant) = TYPE_SIZE (type);
2340 160662736 : TYPE_SIZE_UNIT (variant) = TYPE_SIZE_UNIT (type);
2341 :
2342 160662736 : if (!TYPE_USER_ALIGN (variant)
2343 2708360 : || TYPE_NAME (variant) == TYPE_NAME (type)
2344 162038060 : || TYPE_ALIGN_RAW (variant) < TYPE_ALIGN_RAW (type))
2345 : {
2346 159287412 : TYPE_ALIGN_RAW (variant) = TYPE_ALIGN_RAW (type);
2347 159287412 : TYPE_USER_ALIGN (variant) = TYPE_USER_ALIGN (type);
2348 : }
2349 :
2350 160662736 : TYPE_PRECISION (variant) = TYPE_PRECISION (type);
2351 160662736 : TYPE_MODE_RAW (variant) = TYPE_MODE_RAW (type);
2352 160662736 : TYPE_EMPTY_P (variant) = TYPE_EMPTY_P (type);
2353 160662736 : TREE_ADDRESSABLE (variant) = TREE_ADDRESSABLE (type);
2354 : }
2355 : }
2356 :
2357 : /* KLASS is a class that we're applying may_alias to after the body is
2358 : parsed. Fixup any POINTER_TO and REFERENCE_TO types. The
2359 : canonical type(s) will be implicitly updated. */
2360 :
2361 : static void
2362 37352 : fixup_may_alias (tree klass)
2363 : {
2364 37352 : tree t, v;
2365 :
2366 55665 : for (t = TYPE_POINTER_TO (klass); t; t = TYPE_NEXT_PTR_TO (t))
2367 54924 : for (v = TYPE_MAIN_VARIANT (t); v; v = TYPE_NEXT_VARIANT (v))
2368 36611 : TYPE_REF_CAN_ALIAS_ALL (v) = true;
2369 37373 : for (t = TYPE_REFERENCE_TO (klass); t; t = TYPE_NEXT_REF_TO (t))
2370 42 : for (v = TYPE_MAIN_VARIANT (t); v; v = TYPE_NEXT_VARIANT (v))
2371 21 : TYPE_REF_CAN_ALIAS_ALL (v) = true;
2372 37352 : }
2373 :
2374 : /* Early variant fixups: we apply attributes at the beginning of the class
2375 : definition, and we need to fix up any variants that have already been
2376 : made via elaborated-type-specifier so that check_qualified_type works. */
2377 :
2378 : void
2379 95690145 : fixup_attribute_variants (tree t)
2380 : {
2381 95690145 : tree variants;
2382 :
2383 95690145 : if (!t)
2384 : return;
2385 :
2386 95690145 : tree attrs = TYPE_ATTRIBUTES (t);
2387 95690145 : unsigned align = TYPE_ALIGN (t);
2388 95690145 : bool user_align = TYPE_USER_ALIGN (t);
2389 95690145 : bool may_alias = lookup_attribute ("may_alias", attrs);
2390 95690145 : bool packed = TYPE_PACKED (t);
2391 :
2392 95690145 : if (may_alias)
2393 18787 : fixup_may_alias (t);
2394 :
2395 95690145 : for (variants = TYPE_NEXT_VARIANT (t);
2396 144243319 : variants;
2397 48553174 : variants = TYPE_NEXT_VARIANT (variants))
2398 : {
2399 : /* These are the two fields that check_qualified_type looks at and
2400 : are affected by attributes. */
2401 48553174 : TYPE_ATTRIBUTES (variants) = attrs;
2402 48553174 : unsigned valign = align;
2403 48553174 : if (TYPE_USER_ALIGN (variants))
2404 24523 : valign = MAX (valign, TYPE_ALIGN (variants));
2405 : else
2406 48528651 : TYPE_USER_ALIGN (variants) = user_align;
2407 48553174 : SET_TYPE_ALIGN (variants, valign);
2408 48553174 : TYPE_PACKED (variants) = packed;
2409 48553174 : if (may_alias)
2410 18565 : fixup_may_alias (variants);
2411 : }
2412 : }
2413 :
2414 : /* Set memoizing fields and bits of T (and its variants) for later
2415 : use. */
2416 :
2417 : static void
2418 49090220 : finish_struct_bits (tree t)
2419 : {
2420 : /* If this type has a copy constructor or a destructor, force its
2421 : mode to be BLKmode, and force its TREE_ADDRESSABLE bit to be
2422 : nonzero. This will cause it to be passed by invisible reference
2423 : and prevent it from being returned in a register. */
2424 49090220 : if (!has_trivial_abi_attribute (t)
2425 49090220 : && (type_has_nontrivial_copy_init (t)
2426 44590761 : || TYPE_HAS_NONTRIVIAL_DESTRUCTOR (t)))
2427 : {
2428 4994120 : SET_DECL_MODE (TYPE_MAIN_DECL (t), BLKmode);
2429 4994120 : SET_TYPE_MODE (t, BLKmode);
2430 4994120 : TREE_ADDRESSABLE (t) = 1;
2431 : }
2432 :
2433 49090220 : if (BINFO_N_BASE_BINFOS (TYPE_BINFO (t)) && TYPE_POLYMORPHIC_P (t))
2434 : /* For a class w/o baseclasses, 'finish_struct' has set
2435 : CLASSTYPE_PURE_VIRTUALS correctly (by definition).
2436 : Similarly for a class whose base classes do not have vtables.
2437 : When neither of these is true, we might have removed abstract
2438 : virtuals (by providing a definition), added some (by declaring
2439 : new ones), or redeclared ones from a base class. We need to
2440 : recalculate what's really an abstract virtual at this point (by
2441 : looking in the vtables). */
2442 1535366 : get_pure_virtuals (t);
2443 :
2444 : /* Fix up variants (if any). */
2445 49090220 : fixup_type_variants (t);
2446 49090220 : }
2447 :
2448 : /* Issue warnings about T having private constructors, but no friends,
2449 : and so forth.
2450 :
2451 : HAS_NONPRIVATE_METHOD is nonzero if T has any non-private methods or
2452 : static members. HAS_NONPRIVATE_STATIC_FN is nonzero if T has any
2453 : non-private static member functions. */
2454 :
2455 : static void
2456 29351013 : maybe_warn_about_overly_private_class (tree t)
2457 : {
2458 29351013 : int has_member_fn = 0;
2459 29351013 : int has_nonprivate_method = 0;
2460 29351013 : bool nonprivate_ctor = false;
2461 :
2462 29351013 : if (!warn_ctor_dtor_privacy
2463 : /* If the class has friends, those entities might create and
2464 : access instances, so we should not warn. */
2465 48 : || (CLASSTYPE_FRIEND_CLASSES (t)
2466 48 : || DECL_FRIENDLIST (TYPE_MAIN_DECL (t)))
2467 : /* We will have warned when the template was declared; there's
2468 : no need to warn on every instantiation. */
2469 29351061 : || CLASSTYPE_TEMPLATE_INSTANTIATION (t))
2470 : /* There's no reason to even consider warning about this
2471 : class. */
2472 : return;
2473 :
2474 : /* We only issue one warning, if more than one applies, because
2475 : otherwise, on code like:
2476 :
2477 : class A {
2478 : // Oops - forgot `public:'
2479 : A();
2480 : A(const A&);
2481 : ~A();
2482 : };
2483 :
2484 : we warn several times about essentially the same problem. */
2485 :
2486 : /* Check to see if all (non-constructor, non-destructor) member
2487 : functions are private. (Since there are no friends or
2488 : non-private statics, we can't ever call any of the private member
2489 : functions.) */
2490 216 : for (tree fn = TYPE_FIELDS (t); fn; fn = DECL_CHAIN (fn))
2491 168 : if (TREE_CODE (fn) == USING_DECL
2492 18 : && DECL_NAME (fn) == ctor_identifier
2493 171 : && !TREE_PRIVATE (fn))
2494 : nonprivate_ctor = true;
2495 165 : else if (!DECL_DECLARES_FUNCTION_P (fn))
2496 : /* Not a function. */;
2497 96 : else if (DECL_ARTIFICIAL (fn))
2498 : /* We're not interested in compiler-generated methods; they don't
2499 : provide any way to call private members. */;
2500 96 : else if (!TREE_PRIVATE (fn))
2501 : {
2502 48 : if (DECL_STATIC_FUNCTION_P (fn))
2503 : /* A non-private static member function is just like a
2504 : friend; it can create and invoke private member
2505 : functions, and be accessed without a class
2506 : instance. */
2507 : return;
2508 :
2509 : has_nonprivate_method = 1;
2510 : /* Keep searching for a static member function. */
2511 : }
2512 96 : else if (!DECL_CONSTRUCTOR_P (fn) && !DECL_DESTRUCTOR_P (fn))
2513 : has_member_fn = 1;
2514 :
2515 48 : if (!has_nonprivate_method && has_member_fn)
2516 : {
2517 : /* There are no non-private methods, and there's at least one
2518 : private member function that isn't a constructor or
2519 : destructor. (If all the private members are
2520 : constructors/destructors we want to use the code below that
2521 : issues error messages specifically referring to
2522 : constructors/destructors.) */
2523 12 : unsigned i;
2524 12 : tree binfo = TYPE_BINFO (t);
2525 :
2526 12 : for (i = 0; i != BINFO_N_BASE_BINFOS (binfo); i++)
2527 0 : if (BINFO_BASE_ACCESS (binfo, i) != access_private_node)
2528 : {
2529 : has_nonprivate_method = 1;
2530 : break;
2531 : }
2532 12 : if (!has_nonprivate_method)
2533 : {
2534 12 : warning (OPT_Wctor_dtor_privacy,
2535 : "all member functions in class %qT are private", t);
2536 12 : return;
2537 : }
2538 : }
2539 :
2540 : /* Even if some of the member functions are non-private, the class
2541 : won't be useful for much if all the constructors or destructors
2542 : are private: such an object can never be created or destroyed. */
2543 36 : if (tree dtor = CLASSTYPE_DESTRUCTOR (t))
2544 6 : if (TREE_PRIVATE (dtor))
2545 : {
2546 6 : warning (OPT_Wctor_dtor_privacy,
2547 : "%q#T only defines a private destructor and has no friends",
2548 : t);
2549 6 : return;
2550 : }
2551 :
2552 : /* Warn about classes that have private constructors and no friends. */
2553 30 : if (TYPE_HAS_USER_CONSTRUCTOR (t)
2554 : /* Implicitly generated constructors are always public. */
2555 30 : && !CLASSTYPE_LAZY_DEFAULT_CTOR (t))
2556 : {
2557 21 : tree copy_or_move = NULL_TREE;
2558 :
2559 : /* If a non-template class does not define a copy
2560 : constructor, one is defined for it, enabling it to avoid
2561 : this warning. For a template class, this does not
2562 : happen, and so we would normally get a warning on:
2563 :
2564 : template <class T> class C { private: C(); };
2565 :
2566 : To avoid this asymmetry, we check TYPE_HAS_COPY_CTOR. All
2567 : complete non-template or fully instantiated classes have this
2568 : flag set. */
2569 21 : if (!TYPE_HAS_COPY_CTOR (t))
2570 : nonprivate_ctor = true;
2571 : else
2572 51 : for (tree fn : ovl_range (CLASSTYPE_CONSTRUCTORS (t)))
2573 27 : if (TREE_PRIVATE (fn))
2574 12 : continue;
2575 15 : else if (copy_fn_p (fn) || move_fn_p (fn))
2576 : /* Ideally, we wouldn't count any constructor that takes
2577 : an argument of the class type as a parameter, because
2578 : such things cannot be used to construct an instance of
2579 : the class unless you already have one. */
2580 : copy_or_move = fn;
2581 : else
2582 : {
2583 : nonprivate_ctor = true;
2584 : break;
2585 : }
2586 :
2587 21 : if (!nonprivate_ctor)
2588 : {
2589 15 : auto_diagnostic_group d;
2590 15 : bool w = warning (OPT_Wctor_dtor_privacy,
2591 : "%q#T only defines private constructors and has "
2592 : "no friends", t);
2593 15 : if (w && copy_or_move)
2594 6 : inform (DECL_SOURCE_LOCATION (copy_or_move),
2595 : "%q#D is public, but requires an existing %q#T object",
2596 : copy_or_move, t);
2597 15 : return;
2598 15 : }
2599 : }
2600 : }
2601 :
2602 : /* Make BINFO's vtable have N entries, including RTTI entries,
2603 : vbase and vcall offsets, etc. Set its type and call the back end
2604 : to lay it out. */
2605 :
2606 : static void
2607 1711593 : layout_vtable_decl (tree binfo, int n)
2608 : {
2609 1711593 : tree atype;
2610 1711593 : tree vtable;
2611 :
2612 1711593 : atype = build_array_of_n_type (vtable_entry_type, n);
2613 1711593 : layout_type (atype);
2614 :
2615 : /* We may have to grow the vtable. */
2616 1711593 : vtable = get_vtbl_decl_for_binfo (binfo);
2617 1711593 : if (!same_type_p (TREE_TYPE (vtable), atype))
2618 : {
2619 576126 : TREE_TYPE (vtable) = atype;
2620 576126 : DECL_SIZE (vtable) = DECL_SIZE_UNIT (vtable) = NULL_TREE;
2621 576126 : layout_decl (vtable, 0);
2622 : }
2623 1711593 : }
2624 :
2625 : /* True iff FNDECL and BASE_FNDECL (both non-static member functions)
2626 : have the same signature. */
2627 :
2628 : int
2629 77891491 : same_signature_p (const_tree fndecl, const_tree base_fndecl)
2630 : {
2631 : /* One destructor overrides another if they are the same kind of
2632 : destructor. */
2633 119366229 : if (DECL_DESTRUCTOR_P (base_fndecl) && DECL_DESTRUCTOR_P (fndecl)
2634 98525795 : && special_function_p (base_fndecl) == special_function_p (fndecl))
2635 : return 1;
2636 : /* But a non-destructor never overrides a destructor, nor vice
2637 : versa, nor do different kinds of destructors override
2638 : one-another. For example, a complete object destructor does not
2639 : override a deleting destructor. */
2640 190497792 : if (DECL_DESTRUCTOR_P (base_fndecl) || DECL_DESTRUCTOR_P (fndecl))
2641 : return 0;
2642 :
2643 47354418 : if (DECL_NAME (fndecl) == DECL_NAME (base_fndecl)
2644 47354418 : || (DECL_CONV_FN_P (fndecl)
2645 111 : && DECL_CONV_FN_P (base_fndecl)
2646 90 : && same_type_p (DECL_CONV_FN_TYPE (fndecl),
2647 : DECL_CONV_FN_TYPE (base_fndecl))))
2648 : {
2649 16710623 : tree fntype = TREE_TYPE (fndecl);
2650 16710623 : tree base_fntype = TREE_TYPE (base_fndecl);
2651 16710623 : if (type_memfn_quals (fntype) == type_memfn_quals (base_fntype)
2652 16710250 : && type_memfn_rqual (fntype) == type_memfn_rqual (base_fntype)
2653 33420870 : && compparms (FUNCTION_FIRST_USER_PARMTYPE (fndecl),
2654 16710247 : FUNCTION_FIRST_USER_PARMTYPE (base_fndecl)))
2655 : return 1;
2656 : }
2657 : return 0;
2658 : }
2659 :
2660 : /* Returns TRUE if DERIVED is a binfo containing the binfo BASE as a
2661 : subobject. */
2662 :
2663 : static bool
2664 227903 : base_derived_from (tree derived, tree base)
2665 : {
2666 227903 : tree probe;
2667 :
2668 228179 : for (probe = base; probe; probe = BINFO_INHERITANCE_CHAIN (probe))
2669 : {
2670 228074 : if (probe == derived)
2671 : return true;
2672 1551 : else if (BINFO_VIRTUAL_P (probe))
2673 : /* If we meet a virtual base, we can't follow the inheritance
2674 : any more. See if the complete type of DERIVED contains
2675 : such a virtual base. */
2676 1275 : return (binfo_for_vbase (BINFO_TYPE (probe), BINFO_TYPE (derived))
2677 1275 : != NULL_TREE);
2678 : }
2679 : return false;
2680 : }
2681 :
2682 7780823 : struct find_final_overrider_data {
2683 : /* The function for which we are trying to find a final overrider. */
2684 : tree fn;
2685 : /* The base class in which the function was declared. */
2686 : tree declaring_base;
2687 : /* The candidate overriders. */
2688 : tree candidates;
2689 : /* Path to most derived. */
2690 : auto_vec<tree> path;
2691 : };
2692 :
2693 : /* Add the overrider along the current path to FFOD->CANDIDATES.
2694 : Returns true if an overrider was found; false otherwise. */
2695 :
2696 : static bool
2697 12832233 : dfs_find_final_overrider_1 (tree binfo,
2698 : find_final_overrider_data *ffod,
2699 : unsigned depth)
2700 : {
2701 12832233 : tree method;
2702 :
2703 : /* If BINFO is not the most derived type, try a more derived class.
2704 : A definition there will overrider a definition here. */
2705 12832233 : if (depth)
2706 : {
2707 4824047 : depth--;
2708 4824047 : if (dfs_find_final_overrider_1
2709 4824047 : (ffod->path[depth], ffod, depth))
2710 : return true;
2711 : }
2712 :
2713 10269492 : method = look_for_overrides_here (BINFO_TYPE (binfo), ffod->fn);
2714 10269492 : if (method)
2715 : {
2716 8008186 : tree *candidate = &ffod->candidates;
2717 :
2718 : /* Remove any candidates overridden by this new function. */
2719 8008708 : while (*candidate)
2720 : {
2721 : /* If *CANDIDATE overrides METHOD, then METHOD
2722 : cannot override anything else on the list. */
2723 227381 : if (base_derived_from (TREE_VALUE (*candidate), binfo))
2724 : return true;
2725 : /* If METHOD overrides *CANDIDATE, remove *CANDIDATE. */
2726 522 : if (base_derived_from (binfo, TREE_VALUE (*candidate)))
2727 468 : *candidate = TREE_CHAIN (*candidate);
2728 : else
2729 54 : candidate = &TREE_CHAIN (*candidate);
2730 : }
2731 :
2732 : /* Add the new function. */
2733 7781327 : ffod->candidates = tree_cons (method, binfo, ffod->candidates);
2734 7781327 : return true;
2735 : }
2736 :
2737 : return false;
2738 : }
2739 :
2740 : /* Called from find_final_overrider via dfs_walk. */
2741 :
2742 : static tree
2743 29428772 : dfs_find_final_overrider_pre (tree binfo, void *data)
2744 : {
2745 29428772 : find_final_overrider_data *ffod = (find_final_overrider_data *) data;
2746 :
2747 29428772 : if (binfo == ffod->declaring_base)
2748 16016372 : dfs_find_final_overrider_1 (binfo, ffod, ffod->path.length ());
2749 29428772 : ffod->path.safe_push (binfo);
2750 :
2751 29428772 : return NULL_TREE;
2752 : }
2753 :
2754 : static tree
2755 29428772 : dfs_find_final_overrider_post (tree /*binfo*/, void *data)
2756 : {
2757 29428772 : find_final_overrider_data *ffod = (find_final_overrider_data *) data;
2758 29428772 : ffod->path.pop ();
2759 :
2760 29428772 : return NULL_TREE;
2761 : }
2762 :
2763 : /* Returns a TREE_LIST whose TREE_PURPOSE is the final overrider for
2764 : FN and whose TREE_VALUE is the binfo for the base where the
2765 : overriding occurs. BINFO (in the hierarchy dominated by the binfo
2766 : DERIVED) is the base object in which FN is declared. */
2767 :
2768 : static tree
2769 7780823 : find_final_overrider (tree derived, tree binfo, tree fn)
2770 : {
2771 7780823 : find_final_overrider_data ffod;
2772 :
2773 : /* Getting this right is a little tricky. This is valid:
2774 :
2775 : struct S { virtual void f (); };
2776 : struct T { virtual void f (); };
2777 : struct U : public S, public T { };
2778 :
2779 : even though calling `f' in `U' is ambiguous. But,
2780 :
2781 : struct R { virtual void f(); };
2782 : struct S : virtual public R { virtual void f (); };
2783 : struct T : virtual public R { virtual void f (); };
2784 : struct U : public S, public T { };
2785 :
2786 : is not -- there's no way to decide whether to put `S::f' or
2787 : `T::f' in the vtable for `R'.
2788 :
2789 : The solution is to look at all paths to BINFO. If we find
2790 : different overriders along any two, then there is a problem. */
2791 7780823 : if (DECL_THUNK_P (fn))
2792 0 : fn = THUNK_TARGET (fn);
2793 :
2794 : /* Determine the depth of the hierarchy. */
2795 7780823 : ffod.fn = fn;
2796 7780823 : ffod.declaring_base = binfo;
2797 7780823 : ffod.candidates = NULL_TREE;
2798 7780823 : ffod.path.create (30);
2799 :
2800 7780823 : dfs_walk_all (derived, dfs_find_final_overrider_pre,
2801 : dfs_find_final_overrider_post, &ffod);
2802 :
2803 : /* If there was no winner, issue an error message. */
2804 7780823 : if (!ffod.candidates || TREE_CHAIN (ffod.candidates))
2805 36 : return error_mark_node;
2806 :
2807 : return ffod.candidates;
2808 7780823 : }
2809 :
2810 : /* Return the index of the vcall offset for FN when TYPE is used as a
2811 : virtual base. */
2812 :
2813 : static tree
2814 351237 : get_vcall_index (tree fn, tree type)
2815 : {
2816 351237 : vec<tree_pair_s, va_gc> *indices = CLASSTYPE_VCALL_INDICES (type);
2817 351237 : tree_pair_p p;
2818 351237 : unsigned ix;
2819 :
2820 357190 : FOR_EACH_VEC_SAFE_ELT (indices, ix, p)
2821 1068174 : if ((DECL_DESTRUCTOR_P (fn) && DECL_DESTRUCTOR_P (p->purpose))
2822 362838 : || same_signature_p (fn, p->purpose))
2823 351237 : return p->value;
2824 :
2825 : /* There should always be an appropriate index. */
2826 0 : gcc_unreachable ();
2827 : }
2828 :
2829 : /* Given a DECL_VINDEX of a virtual function found in BINFO, return the final
2830 : overrider at that index in the vtable. This should only be used when we
2831 : know that BINFO is correct for the dynamic type of the object. */
2832 :
2833 : tree
2834 1069 : lookup_vfn_in_binfo (tree idx, tree binfo)
2835 : {
2836 1069 : int ix = tree_to_shwi (idx);
2837 1069 : if (TARGET_VTABLE_USES_DESCRIPTORS)
2838 : ix /= MAX (TARGET_VTABLE_USES_DESCRIPTORS, 1);
2839 1358 : while (BINFO_PRIMARY_P (binfo))
2840 : /* BINFO_VIRTUALS in a primary base isn't accurate, find the derived
2841 : class that actually owns the vtable. */
2842 289 : binfo = BINFO_INHERITANCE_CHAIN (binfo);
2843 1069 : tree virtuals = BINFO_VIRTUALS (binfo);
2844 1069 : return TREE_VALUE (chain_index (ix, virtuals));
2845 : }
2846 :
2847 : /* Update an entry in the vtable for BINFO, which is in the hierarchy
2848 : dominated by T. FN is the old function; VIRTUALS points to the
2849 : corresponding position in the new BINFO_VIRTUALS list. IX is the index
2850 : of that entry in the list. */
2851 :
2852 : static void
2853 7363273 : update_vtable_entry_for_fn (tree t, tree binfo, tree fn, tree* virtuals,
2854 : unsigned ix)
2855 : {
2856 7363273 : tree b;
2857 7363273 : tree overrider;
2858 7363273 : tree delta;
2859 7363273 : tree virtual_base;
2860 7363273 : tree first_defn;
2861 7363273 : tree overrider_fn, overrider_target;
2862 7363273 : tree target_fn = DECL_THUNK_P (fn) ? THUNK_TARGET (fn) : fn;
2863 7363273 : tree over_return, base_return;
2864 7363273 : bool lost = false;
2865 :
2866 : /* Find the nearest primary base (possibly binfo itself) which defines
2867 : this function; this is the class the caller will convert to when
2868 : calling FN through BINFO. */
2869 9565277 : for (b = binfo; ; b = get_primary_binfo (b))
2870 : {
2871 9565277 : gcc_assert (b);
2872 9565277 : if (look_for_overrides_here (BINFO_TYPE (b), target_fn))
2873 : break;
2874 :
2875 : /* The nearest definition is from a lost primary. */
2876 2202004 : if (BINFO_LOST_PRIMARY_P (b))
2877 412 : lost = true;
2878 : }
2879 7363273 : first_defn = b;
2880 :
2881 : /* Find the final overrider. */
2882 7363273 : overrider = find_final_overrider (TYPE_BINFO (t), b, target_fn);
2883 7363273 : if (overrider == error_mark_node)
2884 : {
2885 9 : error ("no unique final overrider for %qD in %qT", target_fn, t);
2886 9 : return;
2887 : }
2888 7363264 : overrider_target = overrider_fn = TREE_PURPOSE (overrider);
2889 :
2890 : /* Check for adjusting covariant return types. */
2891 7363264 : over_return = TREE_TYPE (TREE_TYPE (overrider_target));
2892 7363264 : base_return = TREE_TYPE (TREE_TYPE (target_fn));
2893 :
2894 7363264 : if (INDIRECT_TYPE_P (over_return)
2895 638584 : && TREE_CODE (over_return) == TREE_CODE (base_return)
2896 638575 : && CLASS_TYPE_P (TREE_TYPE (over_return))
2897 41027 : && CLASS_TYPE_P (TREE_TYPE (base_return))
2898 : /* If the overrider is invalid, don't even try. */
2899 7404285 : && !DECL_INVALID_OVERRIDER_P (overrider_target))
2900 : {
2901 : /* If FN is a covariant thunk, we must figure out the adjustment
2902 : to the final base FN was converting to. As OVERRIDER_TARGET might
2903 : also be converting to the return type of FN, we have to
2904 : combine the two conversions here. */
2905 40988 : tree fixed_offset, virtual_offset;
2906 :
2907 40988 : over_return = TREE_TYPE (over_return);
2908 40988 : base_return = TREE_TYPE (base_return);
2909 :
2910 40988 : if (DECL_THUNK_P (fn))
2911 : {
2912 60 : gcc_assert (DECL_RESULT_THUNK_P (fn));
2913 60 : fixed_offset = ssize_int (THUNK_FIXED_OFFSET (fn));
2914 60 : virtual_offset = THUNK_VIRTUAL_OFFSET (fn);
2915 : }
2916 : else
2917 : fixed_offset = virtual_offset = NULL_TREE;
2918 :
2919 60 : if (virtual_offset)
2920 : /* Find the equivalent binfo within the return type of the
2921 : overriding function. We will want the vbase offset from
2922 : there. */
2923 54 : virtual_offset = binfo_for_vbase (BINFO_TYPE (virtual_offset),
2924 : over_return);
2925 40934 : else if (!same_type_ignoring_top_level_qualifiers_p
2926 40934 : (over_return, base_return))
2927 : {
2928 : /* There was no existing virtual thunk (which takes
2929 : precedence). So find the binfo of the base function's
2930 : return type within the overriding function's return type.
2931 : Fortunately we know the covariancy is valid (it
2932 : has already been checked), so we can just iterate along
2933 : the binfos, which have been chained in inheritance graph
2934 : order. Of course it is lame that we have to repeat the
2935 : search here anyway -- we should really be caching pieces
2936 : of the vtable and avoiding this repeated work. */
2937 379 : tree thunk_binfo = NULL_TREE;
2938 379 : tree base_binfo = TYPE_BINFO (base_return);
2939 :
2940 : /* Find the base binfo within the overriding function's
2941 : return type. We will always find a thunk_binfo, except
2942 : when the covariancy is invalid (which we will have
2943 : already diagnosed). */
2944 379 : if (base_binfo)
2945 984 : for (thunk_binfo = TYPE_BINFO (over_return); thunk_binfo;
2946 608 : thunk_binfo = TREE_CHAIN (thunk_binfo))
2947 984 : if (SAME_BINFO_TYPE_P (BINFO_TYPE (thunk_binfo),
2948 : BINFO_TYPE (base_binfo)))
2949 : break;
2950 379 : gcc_assert (thunk_binfo || errorcount);
2951 :
2952 : /* See if virtual inheritance is involved. */
2953 379 : for (virtual_offset = thunk_binfo;
2954 671 : virtual_offset;
2955 292 : virtual_offset = BINFO_INHERITANCE_CHAIN (virtual_offset))
2956 537 : if (BINFO_VIRTUAL_P (virtual_offset))
2957 : break;
2958 :
2959 379 : if (virtual_offset
2960 510 : || (thunk_binfo && !BINFO_OFFSET_ZEROP (thunk_binfo)))
2961 : {
2962 320 : tree offset = fold_convert (ssizetype, BINFO_OFFSET (thunk_binfo));
2963 :
2964 320 : if (virtual_offset)
2965 : {
2966 : /* We convert via virtual base. Adjust the fixed
2967 : offset to be from there. */
2968 245 : offset =
2969 245 : size_diffop (offset,
2970 : fold_convert (ssizetype,
2971 : BINFO_OFFSET (virtual_offset)));
2972 : }
2973 320 : if (fixed_offset)
2974 : /* There was an existing fixed offset, this must be
2975 : from the base just converted to, and the base the
2976 : FN was thunking to. */
2977 6 : fixed_offset = size_binop (PLUS_EXPR, fixed_offset, offset);
2978 : else
2979 : fixed_offset = offset;
2980 : }
2981 : }
2982 :
2983 40988 : if (fixed_offset || virtual_offset)
2984 : /* Replace the overriding function with a covariant thunk. We
2985 : will emit the overriding function in its own slot as
2986 : well. */
2987 374 : overrider_fn = make_thunk (overrider_target, /*this_adjusting=*/0,
2988 : fixed_offset, virtual_offset);
2989 : }
2990 : else
2991 7322276 : gcc_assert (DECL_INVALID_OVERRIDER_P (overrider_target) ||
2992 : !DECL_THUNK_P (fn));
2993 :
2994 : /* If we need a covariant thunk, then we may need to adjust first_defn.
2995 : The ABI specifies that the thunks emitted with a function are
2996 : determined by which bases the function overrides, so we need to be
2997 : sure that we're using a thunk for some overridden base; even if we
2998 : know that the necessary this adjustment is zero, there may not be an
2999 : appropriate zero-this-adjustment thunk for us to use since thunks for
3000 : overriding virtual bases always use the vcall offset.
3001 :
3002 : Furthermore, just choosing any base that overrides this function isn't
3003 : quite right, as this slot won't be used for calls through a type that
3004 : puts a covariant thunk here. Calling the function through such a type
3005 : will use a different slot, and that slot is the one that determines
3006 : the thunk emitted for that base.
3007 :
3008 : So, keep looking until we find the base that we're really overriding
3009 : in this slot: the nearest primary base that doesn't use a covariant
3010 : thunk in this slot. */
3011 7363264 : if (overrider_target != overrider_fn)
3012 : {
3013 374 : if (BINFO_TYPE (b) == DECL_CONTEXT (overrider_target))
3014 : /* We already know that the overrider needs a covariant thunk. */
3015 132 : b = get_primary_binfo (b);
3016 30 : for (; ; b = get_primary_binfo (b))
3017 : {
3018 404 : tree main_binfo = TYPE_BINFO (BINFO_TYPE (b));
3019 404 : tree bv = chain_index (ix, BINFO_VIRTUALS (main_binfo));
3020 404 : if (!DECL_THUNK_P (TREE_VALUE (bv)))
3021 : break;
3022 30 : if (BINFO_LOST_PRIMARY_P (b))
3023 6 : lost = true;
3024 30 : }
3025 : first_defn = b;
3026 : }
3027 :
3028 : /* Assume that we will produce a thunk that convert all the way to
3029 : the final overrider, and not to an intermediate virtual base. */
3030 7363264 : virtual_base = NULL_TREE;
3031 :
3032 : /* See if we can convert to an intermediate virtual base first, and then
3033 : use the vcall offset located there to finish the conversion. */
3034 7555962 : for (; b; b = BINFO_INHERITANCE_CHAIN (b))
3035 : {
3036 : /* If we find the final overrider, then we can stop
3037 : walking. */
3038 7555962 : if (SAME_BINFO_TYPE_P (BINFO_TYPE (b),
3039 : BINFO_TYPE (TREE_VALUE (overrider))))
3040 : break;
3041 :
3042 : /* If we find a virtual base, and we haven't yet found the
3043 : overrider, then there is a virtual base between the
3044 : declaring base (first_defn) and the final overrider. */
3045 543935 : if (BINFO_VIRTUAL_P (b))
3046 : {
3047 : virtual_base = b;
3048 : break;
3049 : }
3050 : }
3051 :
3052 : /* Compute the constant adjustment to the `this' pointer. The
3053 : `this' pointer, when this function is called, will point at BINFO
3054 : (or one of its primary bases, which are at the same offset). */
3055 7363264 : if (virtual_base)
3056 : /* The `this' pointer needs to be adjusted from the declaration to
3057 : the nearest virtual base. */
3058 1053711 : delta = size_diffop_loc (input_location,
3059 351237 : fold_convert (ssizetype, BINFO_OFFSET (virtual_base)),
3060 351237 : fold_convert (ssizetype, BINFO_OFFSET (first_defn)));
3061 7012027 : else if (lost)
3062 : /* If the nearest definition is in a lost primary, we don't need an
3063 : entry in our vtable. Except possibly in a constructor vtable,
3064 : if we happen to get our primary back. In that case, the offset
3065 : will be zero, as it will be a primary base. */
3066 367 : delta = size_zero_node;
3067 : else
3068 : /* The `this' pointer needs to be adjusted from pointing to
3069 : BINFO to pointing at the base where the final overrider
3070 : appears. */
3071 21034980 : delta = size_diffop_loc (input_location,
3072 7011660 : fold_convert (ssizetype,
3073 : BINFO_OFFSET (TREE_VALUE (overrider))),
3074 7011660 : fold_convert (ssizetype, BINFO_OFFSET (binfo)));
3075 :
3076 7363264 : modify_vtable_entry (t, binfo, overrider_fn, delta, virtuals);
3077 :
3078 7363264 : if (virtual_base)
3079 702474 : BV_VCALL_INDEX (*virtuals)
3080 702474 : = get_vcall_index (overrider_target, BINFO_TYPE (virtual_base));
3081 : else
3082 7012027 : BV_VCALL_INDEX (*virtuals) = NULL_TREE;
3083 :
3084 7363264 : BV_LOST_PRIMARY (*virtuals) = lost;
3085 : }
3086 :
3087 : /* Called from modify_all_vtables via dfs_walk. */
3088 :
3089 : static tree
3090 52478945 : dfs_modify_vtables (tree binfo, void* data)
3091 : {
3092 52478945 : tree t = (tree) data;
3093 52478945 : tree virtuals;
3094 52478945 : tree old_virtuals;
3095 52478945 : unsigned ix;
3096 :
3097 52478945 : if (!TYPE_CONTAINS_VPTR_P (BINFO_TYPE (binfo)))
3098 : /* A base without a vtable needs no modification, and its bases
3099 : are uninteresting. */
3100 : return dfs_skip_bases;
3101 :
3102 4510066 : if (SAME_BINFO_TYPE_P (BINFO_TYPE (binfo), t)
3103 4510066 : && !CLASSTYPE_HAS_PRIMARY_BASE_P (t))
3104 : /* Don't do the primary vtable, if it's new. */
3105 : return NULL_TREE;
3106 :
3107 4265224 : if (BINFO_PRIMARY_P (binfo) && !BINFO_VIRTUAL_P (binfo))
3108 : /* There's no need to modify the vtable for a non-virtual primary
3109 : base; we're not going to use that vtable anyhow. We do still
3110 : need to do this for virtual primary bases, as they could become
3111 : non-primary in a construction vtable. */
3112 : return NULL_TREE;
3113 :
3114 1715887 : make_new_vtable (t, binfo);
3115 :
3116 : /* Now, go through each of the virtual functions in the virtual
3117 : function table for BINFO. Find the final overrider, and update
3118 : the BINFO_VIRTUALS list appropriately. */
3119 1715887 : for (ix = 0, virtuals = BINFO_VIRTUALS (binfo),
3120 1715887 : old_virtuals = BINFO_VIRTUALS (TYPE_BINFO (BINFO_TYPE (binfo)));
3121 9079160 : virtuals;
3122 7363273 : ix++, virtuals = TREE_CHAIN (virtuals),
3123 7363273 : old_virtuals = TREE_CHAIN (old_virtuals))
3124 7363273 : update_vtable_entry_for_fn (t,
3125 : binfo,
3126 7363273 : BV_FN (old_virtuals),
3127 : &virtuals, ix);
3128 :
3129 : return NULL_TREE;
3130 : }
3131 :
3132 : /* Update all of the primary and secondary vtables for T. Create new
3133 : vtables as required, and initialize their RTTI information. Each
3134 : of the functions in VIRTUALS is declared in T and may override a
3135 : virtual function from a base class; find and modify the appropriate
3136 : entries to point to the overriding functions. Returns a list, in
3137 : declaration order, of the virtual functions that are declared in T,
3138 : but do not appear in the primary base class vtable, and which
3139 : should therefore be appended to the end of the vtable for T. */
3140 :
3141 : static tree
3142 49090220 : modify_all_vtables (tree t, tree virtuals)
3143 : {
3144 49090220 : tree binfo = TYPE_BINFO (t);
3145 49090220 : tree *fnsp;
3146 :
3147 : /* Mangle the vtable name before entering dfs_walk (c++/51884). */
3148 49090220 : if (TYPE_CONTAINS_VPTR_P (t))
3149 1711593 : get_vtable_decl (t, false);
3150 :
3151 : /* Update all of the vtables. */
3152 49090220 : dfs_walk_once (binfo, dfs_modify_vtables, NULL, t);
3153 :
3154 : /* Add virtual functions not already in our primary vtable. These
3155 : will be both those introduced by this class, and those overridden
3156 : from secondary bases. It does not include virtuals merely
3157 : inherited from secondary bases. */
3158 56847565 : for (fnsp = &virtuals; *fnsp; )
3159 : {
3160 7757345 : tree fn = TREE_VALUE (*fnsp);
3161 :
3162 7757345 : if (!value_member (fn, BINFO_VIRTUALS (binfo))
3163 12553334 : || DECL_VINDEX (fn) == error_mark_node)
3164 : {
3165 : /* We don't need to adjust the `this' pointer when
3166 : calling this function. */
3167 2961356 : BV_DELTA (*fnsp) = integer_zero_node;
3168 2961356 : BV_VCALL_INDEX (*fnsp) = NULL_TREE;
3169 :
3170 : /* This is a function not already in our vtable. Keep it. */
3171 2961356 : fnsp = &TREE_CHAIN (*fnsp);
3172 : }
3173 : else
3174 : /* We've already got an entry for this function. Skip it. */
3175 4795989 : *fnsp = TREE_CHAIN (*fnsp);
3176 : }
3177 :
3178 49090220 : return virtuals;
3179 : }
3180 :
3181 : /* Get the base virtual function declarations in T that have the
3182 : indicated NAME. */
3183 :
3184 : static void
3185 238366 : get_basefndecls (tree name, tree t, vec<tree> *base_fndecls)
3186 : {
3187 238366 : bool found_decls = false;
3188 :
3189 : /* Find virtual functions in T with the indicated NAME. */
3190 341506 : for (tree method : ovl_range (get_class_binding (t, name)))
3191 : {
3192 78849 : if (TREE_CODE (method) == FUNCTION_DECL && DECL_VINDEX (method))
3193 : {
3194 20688 : base_fndecls->safe_push (method);
3195 20688 : found_decls = true;
3196 : }
3197 : }
3198 :
3199 238366 : if (found_decls)
3200 : return;
3201 :
3202 218924 : int n_baseclasses = BINFO_N_BASE_BINFOS (TYPE_BINFO (t));
3203 249149 : for (int i = 0; i < n_baseclasses; i++)
3204 : {
3205 30225 : tree basetype = BINFO_TYPE (BINFO_BASE_BINFO (TYPE_BINFO (t), i));
3206 30225 : get_basefndecls (name, basetype, base_fndecls);
3207 : }
3208 : }
3209 :
3210 : /* If this method overrides a virtual method from a base, then mark
3211 : this member function as being virtual as well. Do 'final' and
3212 : 'override' checks too. */
3213 :
3214 : void
3215 143583853 : check_for_override (tree decl, tree ctype)
3216 : {
3217 143583853 : if (TREE_CODE (decl) == TEMPLATE_DECL)
3218 : /* In [temp.mem] we have:
3219 :
3220 : A specialization of a member function template does not
3221 : override a virtual function from a base class. */
3222 : return;
3223 :
3224 : /* IDENTIFIER_VIRTUAL_P indicates whether the name has ever been
3225 : used for a vfunc. That avoids the expensive look_for_overrides
3226 : call that when we know there's nothing to find. As conversion
3227 : operators for the same type can have distinct identifiers, we
3228 : cannot optimize those in that way. */
3229 117178740 : if ((IDENTIFIER_VIRTUAL_P (DECL_NAME (decl))
3230 102999561 : || DECL_CONV_FN_P (decl))
3231 15744668 : && look_for_overrides (ctype, decl)
3232 : /* Check staticness after we've checked if we 'override'. */
3233 120636907 : && !DECL_STATIC_FUNCTION_P (decl))
3234 : {
3235 : /* Set DECL_VINDEX to a value that is neither an INTEGER_CST nor
3236 : the error_mark_node so that we know it is an overriding
3237 : function. */
3238 3458161 : DECL_VINDEX (decl) = decl;
3239 :
3240 3458161 : if (warn_override
3241 6 : && !DECL_OVERRIDE_P (decl)
3242 5 : && !DECL_FINAL_P (decl)
3243 3458165 : && !DECL_DESTRUCTOR_P (decl))
3244 3 : warning_at (DECL_SOURCE_LOCATION (decl), OPT_Wsuggest_override,
3245 : "%qD can be marked override", decl);
3246 : }
3247 113720579 : else if (DECL_OVERRIDE_P (decl))
3248 20 : error ("%q+#D marked %<override%>, but does not override", decl);
3249 :
3250 117178740 : if (DECL_VIRTUAL_P (decl))
3251 : {
3252 : /* Remember this identifier is virtual name. */
3253 6161932 : IDENTIFIER_VIRTUAL_P (DECL_NAME (decl)) = true;
3254 :
3255 6161932 : if (!DECL_VINDEX (decl))
3256 : /* It's a new vfunc. */
3257 2703787 : DECL_VINDEX (decl) = error_mark_node;
3258 :
3259 6161932 : if (DECL_DESTRUCTOR_P (decl))
3260 1595385 : TYPE_HAS_NONTRIVIAL_DESTRUCTOR (ctype) = true;
3261 :
3262 6161932 : if (DECL_HAS_CONTRACTS_P (decl))
3263 12 : error_at (DECL_SOURCE_LOCATION (decl),
3264 : "contracts cannot be added to virtual functions");
3265 : }
3266 111016808 : else if (DECL_FINAL_P (decl))
3267 19 : error ("%q+#D marked %<final%>, but is not virtual", decl);
3268 : }
3269 :
3270 : /* Warn about hidden virtual functions that are not overridden in t.
3271 : We know that constructors and destructors don't apply. */
3272 :
3273 : static void
3274 423911 : warn_hidden (tree t)
3275 : {
3276 423911 : if (vec<tree, va_gc> *member_vec = CLASSTYPE_MEMBER_VEC (t))
3277 2113481 : for (unsigned ix = member_vec->length (); ix--;)
3278 : {
3279 1970413 : tree fns = (*member_vec)[ix];
3280 :
3281 1970413 : if (!OVL_P (fns))
3282 1970255 : continue;
3283 :
3284 1080372 : tree name = OVL_NAME (fns);
3285 1080372 : size_t num_fns = 0; /* The number of fndecls in fns. */
3286 1080372 : auto_vec<tree, 20> base_fndecls;
3287 1080372 : tree base_binfo;
3288 1080372 : tree binfo;
3289 1080372 : unsigned j;
3290 1080372 : size_t num_overriders = 0;
3291 1080372 : hash_set<tree> overriden_base_fndecls;
3292 : /* base_fndecls that are hidden but not overriden. The "value"
3293 : contains the last fndecl we saw that hides the "key". */
3294 1080372 : hash_map<tree, tree> hidden_base_fndecls;
3295 :
3296 1080372 : if (IDENTIFIER_CDTOR_P (name))
3297 358919 : continue;
3298 :
3299 : /* Iterate through all of the base classes looking for possibly
3300 : hidden functions. */
3301 929594 : for (binfo = TYPE_BINFO (t), j = 0;
3302 929594 : BINFO_BASE_ITERATE (binfo, j, base_binfo); j++)
3303 : {
3304 208141 : tree basetype = BINFO_TYPE (base_binfo);
3305 208141 : get_basefndecls (name, basetype, &base_fndecls);
3306 : }
3307 :
3308 : /* If there are no functions to hide, continue. */
3309 721453 : if (base_fndecls.is_empty ())
3310 702017 : continue;
3311 :
3312 : /* Find all the base_fndecls that are overridden, as well as those
3313 : that are hidden, in T. */
3314 41212 : for (tree fndecl : ovl_range (fns))
3315 : {
3316 20599 : bool template_p = TREE_CODE (fndecl) == TEMPLATE_DECL;
3317 20599 : bool fndecl_overrides_p = false;
3318 20599 : fndecl = STRIP_TEMPLATE (fndecl);
3319 20599 : if (TREE_CODE (fndecl) != FUNCTION_DECL
3320 20599 : || fndecl == conv_op_marker)
3321 15 : continue;
3322 20584 : num_fns++;
3323 43491 : for (size_t k = 0; k < base_fndecls.length (); k++)
3324 : {
3325 22907 : if (!base_fndecls[k] || !DECL_VINDEX (base_fndecls[k]))
3326 0 : continue;
3327 22907 : if (IDENTIFIER_CONV_OP_P (name)
3328 22907 : && !same_type_p (DECL_CONV_FN_TYPE (fndecl),
3329 : DECL_CONV_FN_TYPE (base_fndecls[k])))
3330 : /* If base_fndecl[k] and fndecl are conversion operators
3331 : to different types, they're unrelated. */
3332 : ;
3333 22874 : else if (!template_p /* Template methods don't override. */
3334 22874 : && same_signature_p (fndecl, base_fndecls[k]))
3335 : {
3336 20471 : overriden_base_fndecls.add (base_fndecls[k]);
3337 20471 : fndecl_overrides_p = true;
3338 : }
3339 : else
3340 : {
3341 : /* fndecl hides base_fndecls[k]. */
3342 2403 : hidden_base_fndecls.put (base_fndecls[k], fndecl);
3343 : }
3344 : }
3345 20584 : if (fndecl_overrides_p)
3346 20465 : ++num_overriders;
3347 : }
3348 :
3349 19436 : if (warn_overloaded_virtual == 1 && num_overriders == num_fns)
3350 : /* All the fns override a base virtual. */
3351 19278 : continue;
3352 :
3353 : /* Now give a warning for all hidden methods. Note that a method that
3354 : is both in hidden_base_fndecls and overriden_base_fndecls is not
3355 : hidden. */
3356 620 : for (auto hidden_base_fndecl : hidden_base_fndecls)
3357 : {
3358 152 : tree hidden_fndecl = hidden_base_fndecl.first;
3359 265 : if (!hidden_fndecl
3360 152 : || overriden_base_fndecls.contains (hidden_fndecl))
3361 113 : continue;
3362 39 : auto_diagnostic_group d;
3363 39 : if (warning_at (location_of (hidden_fndecl),
3364 39 : OPT_Woverloaded_virtual_,
3365 : "%qD was hidden", hidden_fndecl))
3366 : {
3367 36 : tree hider = hidden_base_fndecl.second;
3368 36 : inform (location_of (hider), " by %qD", hider);
3369 : }
3370 39 : }
3371 1080372 : }
3372 423911 : }
3373 :
3374 : /* Recursive helper for finish_struct_anon. */
3375 :
3376 : static void
3377 216341 : finish_struct_anon_r (tree field)
3378 : {
3379 966634 : for (tree elt = TYPE_FIELDS (TREE_TYPE (field)); elt; elt = DECL_CHAIN (elt))
3380 : {
3381 : /* We're generally only interested in entities the user
3382 : declared, but we also find nested classes by noticing
3383 : the TYPE_DECL that we create implicitly. You're
3384 : allowed to put one anonymous union inside another,
3385 : though, so we explicitly tolerate that. We use
3386 : TYPE_UNNAMED_P rather than ANON_AGGR_TYPE_P so that
3387 : we also allow unnamed types used for defining fields. */
3388 750293 : if (DECL_ARTIFICIAL (elt)
3389 750293 : && (!DECL_IMPLICIT_TYPEDEF_P (elt)
3390 110838 : || TYPE_UNNAMED_P (TREE_TYPE (elt))))
3391 253286 : continue;
3392 :
3393 497007 : TREE_PRIVATE (elt) = TREE_PRIVATE (field);
3394 497007 : TREE_PROTECTED (elt) = TREE_PROTECTED (field);
3395 :
3396 : /* Recurse into the anonymous aggregates to correctly handle
3397 : access control (c++/24926):
3398 :
3399 : class A {
3400 : union {
3401 : union {
3402 : int i;
3403 : };
3404 : };
3405 : };
3406 :
3407 : int j=A().i; */
3408 497007 : if (DECL_NAME (elt) == NULL_TREE
3409 497007 : && ANON_AGGR_TYPE_P (TREE_TYPE (elt)))
3410 36151 : finish_struct_anon_r (elt);
3411 : }
3412 216341 : }
3413 :
3414 : /* Fix up any anonymous union/struct members of T. */
3415 :
3416 : static void
3417 49090220 : finish_struct_anon (tree t)
3418 : {
3419 317487398 : for (tree field = TYPE_FIELDS (t); field; field = DECL_CHAIN (field))
3420 : {
3421 268397178 : if (TREE_STATIC (field))
3422 13815523 : continue;
3423 254581655 : if (TREE_CODE (field) != FIELD_DECL)
3424 237718736 : continue;
3425 :
3426 16862919 : if (DECL_NAME (field) == NULL_TREE
3427 16862919 : && ANON_AGGR_TYPE_P (TREE_TYPE (field)))
3428 180190 : finish_struct_anon_r (field);
3429 : }
3430 49090220 : }
3431 :
3432 : /* Add T to CLASSTYPE_DECL_LIST of current_class_type which
3433 : will be used later during class template instantiation.
3434 : When FRIEND_P is zero, T can be a static member data (VAR_DECL),
3435 : a non-static member data (FIELD_DECL), a member function
3436 : (FUNCTION_DECL), a nested type (RECORD_TYPE, ENUM_TYPE),
3437 : a typedef (TYPE_DECL) or a member class template (TEMPLATE_DECL)
3438 : When FRIEND_P is nonzero, T is either a friend class
3439 : (RECORD_TYPE, TEMPLATE_DECL) or a friend function
3440 : (FUNCTION_DECL, TEMPLATE_DECL). */
3441 :
3442 : void
3443 439009905 : maybe_add_class_template_decl_list (tree type, tree t, int friend_p)
3444 : {
3445 439009905 : if (CLASSTYPE_TEMPLATE_INFO (type)
3446 439009905 : && TREE_CODE (t) != CONST_DECL)
3447 : {
3448 380663801 : tree purpose = friend_p ? NULL_TREE : type;
3449 :
3450 380663801 : CLASSTYPE_DECL_LIST (type)
3451 761327602 : = tree_cons (purpose, t, CLASSTYPE_DECL_LIST (type));
3452 : }
3453 439009905 : }
3454 :
3455 : /* This function is called from declare_virt_assop_and_dtor via
3456 : dfs_walk_all.
3457 :
3458 : DATA is a type that direcly or indirectly inherits the base
3459 : represented by BINFO. If BINFO contains a virtual assignment [copy
3460 : assignment or move assigment] operator or a virtual constructor,
3461 : declare that function in DATA if it hasn't been already declared. */
3462 :
3463 : static tree
3464 3611781 : dfs_declare_virt_assop_and_dtor (tree binfo, void *data)
3465 : {
3466 3611781 : tree bv, fn, t = (tree)data;
3467 3611781 : tree opname = assign_op_identifier;
3468 :
3469 3611781 : gcc_assert (t && CLASS_TYPE_P (t));
3470 3611781 : gcc_assert (binfo && TREE_CODE (binfo) == TREE_BINFO);
3471 :
3472 3611781 : if (!TYPE_CONTAINS_VPTR_P (BINFO_TYPE (binfo)))
3473 : /* A base without a vtable needs no modification, and its bases
3474 : are uninteresting. */
3475 : return dfs_skip_bases;
3476 :
3477 3053704 : if (BINFO_PRIMARY_P (binfo))
3478 : /* If this is a primary base, then we have already looked at the
3479 : virtual functions of its vtable. */
3480 : return NULL_TREE;
3481 :
3482 12085287 : for (bv = BINFO_VIRTUALS (binfo); bv; bv = TREE_CHAIN (bv))
3483 : {
3484 9031583 : fn = BV_FN (bv);
3485 :
3486 9031583 : if (DECL_NAME (fn) == opname)
3487 : {
3488 21 : if (CLASSTYPE_LAZY_COPY_ASSIGN (t))
3489 21 : lazily_declare_fn (sfk_copy_assignment, t);
3490 21 : if (CLASSTYPE_LAZY_MOVE_ASSIGN (t))
3491 14 : lazily_declare_fn (sfk_move_assignment, t);
3492 : }
3493 9031562 : else if (DECL_DESTRUCTOR_P (fn)
3494 9031562 : && CLASSTYPE_LAZY_DESTRUCTOR (t))
3495 181553 : lazily_declare_fn (sfk_destructor, t);
3496 : }
3497 :
3498 : return NULL_TREE;
3499 : }
3500 :
3501 : /* If the class type T has a direct or indirect base that contains a
3502 : virtual assignment operator or a virtual destructor, declare that
3503 : function in T if it hasn't been already declared. */
3504 :
3505 : static void
3506 49090220 : declare_virt_assop_and_dtor (tree t)
3507 : {
3508 49090220 : if (!(TYPE_POLYMORPHIC_P (t)
3509 1709106 : && (CLASSTYPE_LAZY_COPY_ASSIGN (t)
3510 610409 : || CLASSTYPE_LAZY_MOVE_ASSIGN (t)
3511 610409 : || CLASSTYPE_LAZY_DESTRUCTOR (t))))
3512 : return;
3513 :
3514 1164818 : dfs_walk_all (TYPE_BINFO (t),
3515 : dfs_declare_virt_assop_and_dtor,
3516 : NULL, t);
3517 : }
3518 :
3519 : /* Declare the inheriting constructor for class T inherited from base
3520 : constructor CTOR with the parameter array PARMS of size NPARMS. */
3521 :
3522 : static void
3523 90 : one_inheriting_sig (tree t, tree ctor, tree *parms, int nparms)
3524 : {
3525 90 : gcc_assert (TYPE_MAIN_VARIANT (t) == t);
3526 :
3527 : /* We don't declare an inheriting ctor that would be a default,
3528 : copy or move ctor for derived or base. */
3529 90 : if (nparms == 0)
3530 : return;
3531 90 : if (nparms == 1
3532 87 : && TYPE_REF_P (parms[0]))
3533 : {
3534 54 : tree parm = TYPE_MAIN_VARIANT (TREE_TYPE (parms[0]));
3535 54 : if (parm == t || parm == DECL_CONTEXT (ctor))
3536 : return;
3537 : }
3538 :
3539 36 : tree parmlist = void_list_node;
3540 75 : for (int i = nparms - 1; i >= 0; i--)
3541 39 : parmlist = tree_cons (NULL_TREE, parms[i], parmlist);
3542 36 : tree fn = implicitly_declare_fn (sfk_inheriting_constructor,
3543 : t, false, ctor, parmlist);
3544 :
3545 36 : if (add_method (t, fn, false))
3546 : {
3547 27 : DECL_CHAIN (fn) = TYPE_FIELDS (t);
3548 27 : TYPE_FIELDS (t) = fn;
3549 : }
3550 : }
3551 :
3552 : /* Declare all the inheriting constructors for class T inherited from base
3553 : constructor CTOR. */
3554 :
3555 : static void
3556 433116 : one_inherited_ctor (tree ctor, tree t, tree using_decl)
3557 : {
3558 433116 : tree parms = FUNCTION_FIRST_USER_PARMTYPE (ctor);
3559 :
3560 433116 : if (flag_new_inheriting_ctors)
3561 : {
3562 433026 : ctor = implicitly_declare_fn (sfk_inheriting_constructor,
3563 : t, /*const*/false, ctor, parms);
3564 433026 : add_method (t, ctor, using_decl != NULL_TREE);
3565 433026 : return;
3566 : }
3567 :
3568 90 : tree *new_parms = XALLOCAVEC (tree, list_length (parms));
3569 90 : int i = 0;
3570 183 : for (; parms && parms != void_list_node; parms = TREE_CHAIN (parms))
3571 : {
3572 93 : if (TREE_PURPOSE (parms))
3573 0 : one_inheriting_sig (t, ctor, new_parms, i);
3574 93 : new_parms[i++] = TREE_VALUE (parms);
3575 : }
3576 90 : one_inheriting_sig (t, ctor, new_parms, i);
3577 90 : if (parms == NULL_TREE)
3578 : {
3579 3 : auto_diagnostic_group d;
3580 3 : if (warning (OPT_Winherited_variadic_ctor,
3581 : "the ellipsis in %qD is not inherited", ctor))
3582 3 : inform (DECL_SOURCE_LOCATION (ctor), "%qD declared here", ctor);
3583 3 : }
3584 : }
3585 :
3586 : /* Implicitly declare T(). */
3587 :
3588 : static void
3589 42385763 : add_implicit_default_ctor (tree t)
3590 : {
3591 42385763 : TYPE_HAS_DEFAULT_CONSTRUCTOR (t) = 1;
3592 42385763 : CLASSTYPE_LAZY_DEFAULT_CTOR (t) = 1;
3593 42385763 : if (cxx_dialect >= cxx11)
3594 42299478 : TYPE_HAS_CONSTEXPR_CTOR (t)
3595 : /* Don't force the declaration to get a hard answer; if the
3596 : definition would have made the class non-literal, it will still be
3597 : non-literal because of the base or member in question, and that
3598 : gives a better diagnostic. */
3599 84598956 : = type_maybe_constexpr_default_constructor (t);
3600 42385763 : }
3601 :
3602 : /* Create default constructors, assignment operators, and so forth for
3603 : the type indicated by T, if they are needed. CANT_HAVE_CONST_CTOR,
3604 : and CANT_HAVE_CONST_ASSIGNMENT are nonzero if, for whatever reason,
3605 : the class cannot have a default constructor, copy constructor
3606 : taking a const reference argument, or an assignment operator taking
3607 : a const reference, respectively. */
3608 :
3609 : static void
3610 49090220 : add_implicitly_declared_members (tree t, tree* access_decls,
3611 : int cant_have_const_cctor,
3612 : int cant_have_const_assignment)
3613 : {
3614 : /* Destructor. */
3615 49090220 : if (!CLASSTYPE_DESTRUCTOR (t))
3616 : /* In general, we create destructors lazily. */
3617 45500980 : CLASSTYPE_LAZY_DESTRUCTOR (t) = 1;
3618 :
3619 49090220 : bool move_ok = false;
3620 48975448 : if (cxx_dialect >= cxx11 && CLASSTYPE_LAZY_DESTRUCTOR (t)
3621 45407510 : && !TYPE_HAS_COPY_CTOR (t) && !TYPE_HAS_COPY_ASSIGN (t)
3622 93160237 : && !classtype_has_move_assign_or_move_ctor_p (t, false))
3623 : move_ok = true;
3624 :
3625 : /* [class.ctor]
3626 :
3627 : If there is no user-declared constructor for a class, a default
3628 : constructor is implicitly declared. */
3629 49090220 : if (! TYPE_HAS_USER_CONSTRUCTOR (t))
3630 42329450 : add_implicit_default_ctor (t);
3631 :
3632 : /* [class.ctor]
3633 :
3634 : If a class definition does not explicitly declare a copy
3635 : constructor, one is declared implicitly. */
3636 49090220 : if (! TYPE_HAS_COPY_CTOR (t))
3637 : {
3638 45704115 : TYPE_HAS_COPY_CTOR (t) = 1;
3639 45704115 : TYPE_HAS_CONST_COPY_CTOR (t) = !cant_have_const_cctor;
3640 45704115 : CLASSTYPE_LAZY_COPY_CTOR (t) = 1;
3641 45704115 : if (move_ok)
3642 43760880 : CLASSTYPE_LAZY_MOVE_CTOR (t) = 1;
3643 : }
3644 :
3645 : /* If there is no assignment operator, one will be created if and
3646 : when it is needed. For now, just record whether or not the type
3647 : of the parameter to the assignment operator will be a const or
3648 : non-const reference. */
3649 49090220 : if (!TYPE_HAS_COPY_ASSIGN (t))
3650 : {
3651 45830746 : TYPE_HAS_COPY_ASSIGN (t) = 1;
3652 45830746 : TYPE_HAS_CONST_COPY_ASSIGN (t) = !cant_have_const_assignment;
3653 45830746 : CLASSTYPE_LAZY_COPY_ASSIGN (t) = 1;
3654 89195799 : if (move_ok && !LAMBDA_TYPE_P (t))
3655 43422073 : CLASSTYPE_LAZY_MOVE_ASSIGN (t) = 1;
3656 : }
3657 :
3658 : /* We can't be lazy about declaring functions that might override
3659 : a virtual function from a base class. */
3660 49090220 : declare_virt_assop_and_dtor (t);
3661 :
3662 : /* If the class definition does not explicitly declare an == operator
3663 : function, but declares a defaulted three-way comparison operator function,
3664 : an == operator function is declared implicitly. */
3665 49090220 : if (!classtype_has_op (t, EQ_EXPR))
3666 47829719 : if (tree space = classtype_has_defaulted_op (t, SPACESHIP_EXPR))
3667 : {
3668 672 : tree eq = implicitly_declare_fn (sfk_comparison, t, false, space,
3669 : NULL_TREE);
3670 672 : bool is_friend = DECL_CONTEXT (space) != t;
3671 672 : if (is_friend)
3672 73 : do_friend (NULL_TREE, DECL_NAME (eq), eq,
3673 : NO_SPECIAL, true);
3674 : else
3675 : {
3676 599 : add_method (t, eq, false);
3677 599 : DECL_CHAIN (eq) = TYPE_FIELDS (t);
3678 599 : TYPE_FIELDS (t) = eq;
3679 : }
3680 672 : maybe_add_class_template_decl_list (t, eq, is_friend);
3681 : }
3682 :
3683 51310135 : while (*access_decls)
3684 : {
3685 2219915 : tree using_decl = TREE_VALUE (*access_decls);
3686 2219915 : tree decl = USING_DECL_DECLS (using_decl);
3687 2219915 : if (DECL_NAME (using_decl) == ctor_identifier)
3688 : {
3689 : /* declare, then remove the decl */
3690 100476 : tree ctor_list = decl;
3691 100476 : location_t loc = input_location;
3692 100476 : input_location = DECL_SOURCE_LOCATION (using_decl);
3693 867292 : for (tree fn : ovl_range (ctor_list))
3694 : {
3695 433116 : if (!TYPE_HAS_DEFAULT_CONSTRUCTOR (t) && default_ctor_p (fn))
3696 : /* CWG2799: Inheriting a default constructor gives us a default
3697 : constructor, not just an inherited constructor. */
3698 56313 : add_implicit_default_ctor (t);
3699 433116 : one_inherited_ctor (fn, t, using_decl);
3700 : }
3701 100476 : *access_decls = TREE_CHAIN (*access_decls);
3702 100476 : input_location = loc;
3703 : }
3704 : else
3705 2119439 : access_decls = &TREE_CHAIN (*access_decls);
3706 : }
3707 49090220 : }
3708 :
3709 : /* Cache of enum_min_precision values. */
3710 : static GTY((deletable)) hash_map<tree, int> *enum_to_min_precision;
3711 :
3712 : /* Return the minimum precision of a bit-field needed to store all
3713 : enumerators of ENUMERAL_TYPE TYPE. */
3714 :
3715 : static int
3716 101078 : enum_min_precision (tree type)
3717 : {
3718 101078 : type = TYPE_MAIN_VARIANT (type);
3719 : /* For unscoped enums without fixed underlying type and without mode
3720 : attribute we can just use precision of the underlying type. */
3721 101078 : if (UNSCOPED_ENUM_P (type)
3722 45585 : && !ENUM_FIXED_UNDERLYING_TYPE_P (type)
3723 109868 : && !lookup_attribute ("mode", TYPE_ATTRIBUTES (type)))
3724 8778 : return TYPE_PRECISION (ENUM_UNDERLYING_TYPE (type));
3725 :
3726 92300 : if (enum_to_min_precision == NULL)
3727 9277 : enum_to_min_precision = hash_map<tree, int>::create_ggc (37);
3728 :
3729 92300 : bool existed;
3730 92300 : int &prec = enum_to_min_precision->get_or_insert (type, &existed);
3731 92300 : if (existed)
3732 55429 : return prec;
3733 :
3734 36871 : tree minnode, maxnode;
3735 36871 : if (TYPE_VALUES (type))
3736 : {
3737 : minnode = maxnode = NULL_TREE;
3738 285375 : for (tree values = TYPE_VALUES (type);
3739 322243 : values; values = TREE_CHAIN (values))
3740 : {
3741 285375 : tree decl = TREE_VALUE (values);
3742 285375 : tree value = DECL_INITIAL (decl);
3743 285375 : if (value == error_mark_node)
3744 0 : value = integer_zero_node;
3745 285375 : if (!minnode)
3746 : minnode = maxnode = value;
3747 248507 : else if (tree_int_cst_lt (maxnode, value))
3748 : maxnode = value;
3749 91930 : else if (tree_int_cst_lt (value, minnode))
3750 0 : minnode = value;
3751 : }
3752 : }
3753 : else
3754 3 : minnode = maxnode = integer_zero_node;
3755 :
3756 36871 : signop sgn = tree_int_cst_sgn (minnode) >= 0 ? UNSIGNED : SIGNED;
3757 36871 : int lowprec = tree_int_cst_min_precision (minnode, sgn);
3758 36871 : int highprec = tree_int_cst_min_precision (maxnode, sgn);
3759 36871 : prec = MAX (lowprec, highprec);
3760 36871 : return prec;
3761 : }
3762 :
3763 : /* FIELD is a bit-field. We are finishing the processing for its
3764 : enclosing type. Issue any appropriate messages and set appropriate
3765 : flags. Returns false if an error has been diagnosed. */
3766 :
3767 : static bool
3768 634428 : check_bitfield_decl (tree field)
3769 : {
3770 634428 : tree type = TREE_TYPE (field);
3771 634428 : tree w;
3772 :
3773 : /* Extract the declared width of the bitfield, which has been
3774 : temporarily stashed in DECL_BIT_FIELD_REPRESENTATIVE by grokbitfield. */
3775 634428 : w = DECL_BIT_FIELD_REPRESENTATIVE (field);
3776 634428 : gcc_assert (w != NULL_TREE);
3777 : /* Remove the bit-field width indicator so that the rest of the
3778 : compiler does not treat that value as a qualifier. */
3779 634428 : DECL_BIT_FIELD_REPRESENTATIVE (field) = NULL_TREE;
3780 :
3781 : /* Detect invalid bit-field type. */
3782 634428 : if (!INTEGRAL_OR_ENUMERATION_TYPE_P (type))
3783 : {
3784 3 : error_at (DECL_SOURCE_LOCATION (field),
3785 : "bit-field %q#D with non-integral type %qT", field, type);
3786 3 : w = error_mark_node;
3787 : }
3788 : else
3789 : {
3790 634425 : location_t loc = input_location;
3791 : /* Avoid the non_lvalue wrapper added by fold for PLUS_EXPRs. */
3792 634425 : STRIP_NOPS (w);
3793 :
3794 : /* detect invalid field size. */
3795 634425 : input_location = DECL_SOURCE_LOCATION (field);
3796 634425 : w = cxx_constant_value (w);
3797 634425 : input_location = loc;
3798 :
3799 634425 : if (TREE_CODE (w) != INTEGER_CST)
3800 : {
3801 15 : error ("bit-field %q+D width not an integer constant", field);
3802 15 : w = error_mark_node;
3803 : }
3804 634410 : else if (tree_int_cst_sgn (w) < 0)
3805 : {
3806 0 : error ("negative width in bit-field %q+D", field);
3807 0 : w = error_mark_node;
3808 : }
3809 634410 : else if (integer_zerop (w) && DECL_NAME (field) != 0)
3810 : {
3811 15 : error ("zero width for bit-field %q+D", field);
3812 15 : w = error_mark_node;
3813 : }
3814 634395 : else if ((TREE_CODE (type) != ENUMERAL_TYPE
3815 634395 : && TREE_CODE (type) != BOOLEAN_TYPE
3816 531832 : && compare_tree_int (w, TYPE_PRECISION (type)) > 0)
3817 634395 : || ((TREE_CODE (type) == ENUMERAL_TYPE
3818 633961 : || TREE_CODE (type) == BOOLEAN_TYPE)
3819 102563 : && tree_int_cst_lt (TYPE_SIZE (type), w)))
3820 774 : warning_at (DECL_SOURCE_LOCATION (field), 0,
3821 : "width of %qD exceeds its type", field);
3822 633621 : else if (TREE_CODE (type) == ENUMERAL_TYPE)
3823 : {
3824 101078 : int prec = enum_min_precision (type);
3825 101078 : if (compare_tree_int (w, prec) < 0)
3826 48 : warning_at (DECL_SOURCE_LOCATION (field), 0,
3827 : "%qD is too small to hold all values of %q#T",
3828 : field, type);
3829 : }
3830 : }
3831 :
3832 634428 : if (w != error_mark_node)
3833 : {
3834 634395 : DECL_SIZE (field) = fold_convert (bitsizetype, w);
3835 634395 : DECL_BIT_FIELD (field) = 1;
3836 634395 : return true;
3837 : }
3838 : else
3839 : {
3840 : /* Non-bit-fields are aligned for their type. */
3841 33 : DECL_BIT_FIELD (field) = 0;
3842 33 : CLEAR_DECL_C_BIT_FIELD (field);
3843 33 : return false;
3844 : }
3845 : }
3846 :
3847 : /* FIELD is a non bit-field. We are finishing the processing for its
3848 : enclosing type T. Issue any appropriate messages and set appropriate
3849 : flags. */
3850 :
3851 : static bool
3852 17357881 : check_field_decl (tree field,
3853 : tree t,
3854 : int* cant_have_const_ctor,
3855 : int* no_const_asn_ref)
3856 : {
3857 17357881 : tree type = strip_array_types (TREE_TYPE (field));
3858 17357881 : bool any_default_members = false;
3859 :
3860 : /* In C++98 an anonymous union cannot contain any fields which would change
3861 : the settings of CANT_HAVE_CONST_CTOR and friends. */
3862 17357881 : if (ANON_UNION_TYPE_P (type) && cxx_dialect < cxx11)
3863 : ;
3864 : /* And, we don't set TYPE_HAS_CONST_COPY_CTOR, etc., for anonymous
3865 : structs. So, we recurse through their fields here. */
3866 17356958 : else if (ANON_AGGR_TYPE_P (type))
3867 : {
3868 962845 : for (tree fields = TYPE_FIELDS (type); fields;
3869 747444 : fields = DECL_CHAIN (fields))
3870 747444 : if (TREE_CODE (fields) == FIELD_DECL)
3871 495127 : any_default_members |= check_field_decl (fields, t,
3872 : cant_have_const_ctor,
3873 : no_const_asn_ref);
3874 : }
3875 : /* Check members with class type for constructors, destructors,
3876 : etc. */
3877 17141557 : else if (CLASS_TYPE_P (type))
3878 : {
3879 : /* Never let anything with uninheritable virtuals
3880 : make it through without complaint. */
3881 3327478 : abstract_virtuals_error (field, type);
3882 :
3883 3327478 : if (TREE_CODE (t) == UNION_TYPE && cxx_dialect < cxx11)
3884 : {
3885 3069 : static bool warned;
3886 3069 : auto_diagnostic_group d;
3887 3069 : int oldcount = errorcount;
3888 3069 : if (TYPE_NEEDS_CONSTRUCTING (type))
3889 2 : error ("member %q+#D with constructor not allowed in union",
3890 : field);
3891 3069 : if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type))
3892 0 : error ("member %q+#D with destructor not allowed in union", field);
3893 3069 : if (TYPE_HAS_COMPLEX_COPY_ASSIGN (type))
3894 3 : error ("member %q+#D with copy assignment operator not allowed in union",
3895 : field);
3896 3069 : if (!warned && errorcount > oldcount)
3897 : {
3898 4 : inform (DECL_SOURCE_LOCATION (field), "unrestricted unions "
3899 : "only available with %<-std=c++11%> or %<-std=gnu++11%>");
3900 4 : warned = true;
3901 : }
3902 3069 : }
3903 : else
3904 : {
3905 3324409 : TYPE_NEEDS_CONSTRUCTING (t) |= TYPE_NEEDS_CONSTRUCTING (type);
3906 9973227 : TYPE_HAS_NONTRIVIAL_DESTRUCTOR (t)
3907 3324409 : |= TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type);
3908 3324409 : TYPE_HAS_COMPLEX_COPY_ASSIGN (t)
3909 3324409 : |= (TYPE_HAS_COMPLEX_COPY_ASSIGN (type)
3910 3324409 : || !TYPE_HAS_COPY_ASSIGN (type));
3911 6648818 : TYPE_HAS_COMPLEX_COPY_CTOR (t) |= (TYPE_HAS_COMPLEX_COPY_CTOR (type)
3912 3324409 : || !TYPE_HAS_COPY_CTOR (type));
3913 3324409 : TYPE_HAS_COMPLEX_MOVE_ASSIGN (t) |= TYPE_HAS_COMPLEX_MOVE_ASSIGN (type);
3914 3324409 : TYPE_HAS_COMPLEX_MOVE_CTOR (t) |= TYPE_HAS_COMPLEX_MOVE_CTOR (type);
3915 6648818 : TYPE_HAS_COMPLEX_DFLT (t) |= (!TYPE_HAS_DEFAULT_CONSTRUCTOR (type)
3916 3324409 : || TYPE_HAS_COMPLEX_DFLT (type));
3917 : }
3918 :
3919 3327478 : if (TYPE_HAS_COPY_CTOR (type)
3920 3327478 : && !TYPE_HAS_CONST_COPY_CTOR (type))
3921 9170 : *cant_have_const_ctor = 1;
3922 :
3923 3327478 : if (TYPE_HAS_COPY_ASSIGN (type)
3924 3327478 : && !TYPE_HAS_CONST_COPY_ASSIGN (type))
3925 55 : *no_const_asn_ref = 1;
3926 : }
3927 :
3928 17357881 : check_abi_tags (t, field);
3929 :
3930 17357881 : if (DECL_INITIAL (field) != NULL_TREE)
3931 : /* `build_class_init_list' does not recognize
3932 : non-FIELD_DECLs. */
3933 1391657 : any_default_members = true;
3934 :
3935 17357881 : return any_default_members;
3936 : }
3937 :
3938 : /* Check the data members (both static and non-static), class-scoped
3939 : typedefs, etc., appearing in the declaration of T. Issue
3940 : appropriate diagnostics. Sets ACCESS_DECLS to a list (in
3941 : declaration order) of access declarations; each TREE_VALUE in this
3942 : list is a USING_DECL.
3943 :
3944 : In addition, set the following flags:
3945 :
3946 : EMPTY_P
3947 : The class is empty, i.e., contains no non-static data members.
3948 :
3949 : CANT_HAVE_CONST_CTOR_P
3950 : This class cannot have an implicitly generated copy constructor
3951 : taking a const reference.
3952 :
3953 : CANT_HAVE_CONST_ASN_REF
3954 : This class cannot have an implicitly generated assignment
3955 : operator taking a const reference.
3956 :
3957 : All of these flags should be initialized before calling this
3958 : function. */
3959 :
3960 : static void
3961 49090220 : check_field_decls (tree t, tree *access_decls,
3962 : int *cant_have_const_ctor_p,
3963 : int *no_const_asn_ref_p)
3964 : {
3965 49090220 : int cant_pack = 0;
3966 :
3967 : /* Assume there are no access declarations. */
3968 49090220 : *access_decls = NULL_TREE;
3969 : /* Effective C has things to say about classes with pointer members. */
3970 49090220 : tree pointer_member = NULL_TREE;
3971 : /* Default initialized members affect the whole class. */
3972 49090220 : tree default_init_member = NULL_TREE;
3973 : /* Lack of any non-static data member of non-volatile literal
3974 : type affects a union. */
3975 49090220 : bool found_nv_literal_p = false;
3976 : /* Standard layout requires all FIELDS have same access. */
3977 49090220 : int field_access = -1;
3978 :
3979 317487398 : for (tree field = TYPE_FIELDS (t); field; field = DECL_CHAIN (field))
3980 : {
3981 268397178 : tree type = TREE_TYPE (field);
3982 :
3983 268397178 : switch (TREE_CODE (field))
3984 : {
3985 0 : default:
3986 0 : gcc_unreachable ();
3987 :
3988 2219915 : case USING_DECL:
3989 : /* Save the access declarations for our caller. */
3990 2219915 : *access_decls = tree_cons (NULL_TREE, field, *access_decls);
3991 2219915 : break;
3992 :
3993 : case TYPE_DECL:
3994 : case TEMPLATE_DECL:
3995 : break;
3996 :
3997 : case FUNCTION_DECL:
3998 : /* FIXME: We should fold in the checking from check_methods. */
3999 : break;
4000 :
4001 1661548 : case CONST_DECL:
4002 1661548 : DECL_NONLOCAL (field) = 1;
4003 1661548 : break;
4004 :
4005 13472273 : case VAR_DECL:
4006 13472273 : if (TREE_CODE (t) == UNION_TYPE
4007 46 : && cxx_dialect < cxx11)
4008 : {
4009 : /* [class.union]
4010 :
4011 : (C++98) If a union contains a static data member,
4012 : ... the program is ill-formed. */
4013 1 : if (cxx_dialect < cxx11)
4014 1 : error ("in C++98 %q+D may not be static because it is "
4015 : "a member of a union", field);
4016 : }
4017 13472273 : goto data_member;
4018 :
4019 16862919 : case FIELD_DECL:
4020 16862919 : if (TREE_CODE (t) == UNION_TYPE)
4021 : {
4022 : /* [class.union]
4023 :
4024 : If a union contains ... or a [non-static data] member
4025 : of reference type, the program is ill-formed. */
4026 1035392 : if (TYPE_REF_P (type))
4027 52 : error ("non-static data member %q+D in a union may not "
4028 : "have reference type %qT", field, type);
4029 : }
4030 :
4031 15827527 : data_member:
4032 : /* Common VAR_DECL & FIELD_DECL processing. */
4033 30335192 : DECL_CONTEXT (field) = t;
4034 30335192 : DECL_NONLOCAL (field) = 1;
4035 :
4036 : /* Template instantiation can cause this. Perhaps this
4037 : should be a specific instantiation check? */
4038 30335192 : if (TREE_CODE (type) == FUNCTION_TYPE)
4039 : {
4040 11 : error ("data member %q+D invalidly declared function type", field);
4041 11 : type = build_pointer_type (type);
4042 11 : TREE_TYPE (field) = type;
4043 : }
4044 30335181 : else if (TREE_CODE (type) == METHOD_TYPE)
4045 : {
4046 0 : error ("data member %q+D invalidly declared method type", field);
4047 0 : type = build_pointer_type (type);
4048 0 : TREE_TYPE (field) = type;
4049 : }
4050 :
4051 : break;
4052 : }
4053 :
4054 268397178 : if (TREE_CODE (field) != FIELD_DECL)
4055 251534259 : continue;
4056 :
4057 16862919 : if (type == error_mark_node)
4058 165 : continue;
4059 :
4060 : /* If it is not a union and at least one non-static data member is
4061 : non-literal, the whole class becomes non-literal. Per Core/1453,
4062 : volatile non-static data members and base classes are also not allowed.
4063 : If it is a union, we might set CLASSTYPE_LITERAL_P after we've seen all
4064 : members.
4065 : Note: if the type is incomplete we will complain later on. */
4066 16862754 : if (COMPLETE_TYPE_P (type))
4067 : {
4068 16861365 : if (!literal_type_p (type) || CP_TYPE_VOLATILE_P (type))
4069 955410 : CLASSTYPE_LITERAL_P (t) = false;
4070 : else
4071 : found_nv_literal_p = true;
4072 : }
4073 :
4074 16862754 : int this_field_access = (TREE_PROTECTED (field) ? 1
4075 15166370 : : TREE_PRIVATE (field) ? 2 : 0);
4076 16862754 : if (field_access != this_field_access)
4077 : {
4078 : /* A standard-layout class is a class that:
4079 :
4080 : ... has the same access control (Clause 11) for all
4081 : non-static data members, */
4082 6729801 : if (field_access < 0)
4083 : field_access = this_field_access;
4084 : else
4085 38980 : CLASSTYPE_NON_STD_LAYOUT (t) = 1;
4086 :
4087 : /* Aggregates must be public. */
4088 6729801 : if (this_field_access)
4089 3292705 : CLASSTYPE_NON_AGGREGATE (t) = 1;
4090 : }
4091 :
4092 : /* If this is of reference type, check if it needs an init. */
4093 16862754 : if (TYPE_REF_P (type))
4094 : {
4095 344191 : CLASSTYPE_NON_LAYOUT_POD_P (t) = 1;
4096 344191 : CLASSTYPE_NON_STD_LAYOUT (t) = 1;
4097 344191 : if (DECL_INITIAL (field) == NULL_TREE)
4098 344062 : SET_CLASSTYPE_REF_FIELDS_NEED_INIT (t, 1);
4099 344191 : if (cxx_dialect < cxx11)
4100 : {
4101 : /* ARM $12.6.2: [A member initializer list] (or, for an
4102 : aggregate, initialization by a brace-enclosed list) is the
4103 : only way to initialize non-static const and reference
4104 : members. */
4105 1101 : TYPE_HAS_COMPLEX_COPY_ASSIGN (t) = 1;
4106 1101 : TYPE_HAS_COMPLEX_MOVE_ASSIGN (t) = 1;
4107 : }
4108 : }
4109 :
4110 16862754 : type = strip_array_types (type);
4111 :
4112 16862754 : if (TYPE_PACKED (t))
4113 : {
4114 1085 : if (!layout_pod_type_p (type) && !TYPE_PACKED (type))
4115 : {
4116 18 : warning_at (DECL_SOURCE_LOCATION (field), 0,
4117 : "ignoring packed attribute because of"
4118 : " unpacked non-POD field %q#D", field);
4119 18 : cant_pack = 1;
4120 : }
4121 1067 : else if (DECL_C_BIT_FIELD (field)
4122 1067 : || TYPE_ALIGN (TREE_TYPE (field)) > BITS_PER_UNIT)
4123 821 : DECL_PACKED (field) = 1;
4124 : }
4125 :
4126 16862754 : if (DECL_C_BIT_FIELD (field)
4127 16862754 : && integer_zerop (DECL_BIT_FIELD_REPRESENTATIVE (field)))
4128 : /* We don't treat zero-width bitfields as making a class
4129 : non-empty. */
4130 : ;
4131 16861585 : else if (field_poverlapping_p (field)
4132 16861585 : && is_empty_class (TREE_TYPE (field)))
4133 : /* Empty data members also don't make a class non-empty. */
4134 222615 : CLASSTYPE_CONTAINS_EMPTY_CLASS_P (t) = 1;
4135 : else
4136 : {
4137 : /* The class is non-empty. */
4138 16638970 : CLASSTYPE_EMPTY_P (t) = 0;
4139 : /* The class is not even nearly empty. */
4140 16638970 : CLASSTYPE_NEARLY_EMPTY_P (t) = 0;
4141 : /* If one of the data members contains an empty class, so
4142 : does T. */
4143 3258426 : if (CLASS_TYPE_P (type)
4144 19886806 : && CLASSTYPE_CONTAINS_EMPTY_CLASS_P (type))
4145 909705 : CLASSTYPE_CONTAINS_EMPTY_CLASS_P (t) = 1;
4146 : }
4147 :
4148 : /* This is used by -Weffc++ (see below). Warn only for pointers
4149 : to members which might hold dynamic memory. So do not warn
4150 : for pointers to functions or pointers to members. */
4151 16862754 : if (TYPE_PTR_P (type)
4152 16862754 : && !TYPE_PTRFN_P (type))
4153 : pointer_member = field;
4154 :
4155 16862754 : if (CLASS_TYPE_P (type))
4156 : {
4157 3470451 : if (CLASSTYPE_REF_FIELDS_NEED_INIT (type))
4158 3002 : SET_CLASSTYPE_REF_FIELDS_NEED_INIT (t, 1);
4159 3470451 : if (CLASSTYPE_READONLY_FIELDS_NEED_INIT (type))
4160 27986 : SET_CLASSTYPE_READONLY_FIELDS_NEED_INIT (t, 1);
4161 : }
4162 :
4163 16862754 : if (DECL_MUTABLE_P (field) || TYPE_HAS_MUTABLE_P (type))
4164 205109 : CLASSTYPE_HAS_MUTABLE (t) = 1;
4165 :
4166 16862754 : if (DECL_MUTABLE_P (field))
4167 : {
4168 127497 : if (TYPE_REF_P (type))
4169 3 : error ("member %q+D cannot be declared as a %<mutable%> "
4170 : "reference", field);
4171 127494 : else if (CP_TYPE_CONST_P (type))
4172 3 : error ("member %q+D cannot be declared both %<const%> "
4173 : "and %<mutable%>", field);
4174 : }
4175 :
4176 16862754 : if (! layout_pod_type_p (type))
4177 : /* DR 148 now allows pointers to members (which are POD themselves),
4178 : to be allowed in POD structs. */
4179 2835390 : CLASSTYPE_NON_LAYOUT_POD_P (t) = 1;
4180 :
4181 16862754 : if (field_poverlapping_p (field))
4182 : /* A potentially-overlapping non-static data member makes the class
4183 : non-layout-POD. */
4184 275964 : CLASSTYPE_NON_LAYOUT_POD_P (t) = 1;
4185 :
4186 16862754 : if (!std_layout_type_p (type))
4187 565499 : CLASSTYPE_NON_STD_LAYOUT (t) = 1;
4188 :
4189 16862754 : if (! zero_init_p (type))
4190 161 : CLASSTYPE_NON_ZERO_INIT_P (t) = 1;
4191 :
4192 : /* We set DECL_C_BIT_FIELD in grokbitfield.
4193 : If the type and width are valid, we'll also set DECL_BIT_FIELD. */
4194 16862754 : if (DECL_C_BIT_FIELD (field))
4195 634428 : check_bitfield_decl (field);
4196 :
4197 16862754 : if (check_field_decl (field, t,
4198 : cant_have_const_ctor_p, no_const_asn_ref_p))
4199 : {
4200 1391636 : if (default_init_member
4201 558572 : && TREE_CODE (t) == UNION_TYPE)
4202 : {
4203 12 : auto_diagnostic_group d;
4204 12 : error ("multiple fields in union %qT initialized", t);
4205 12 : inform (DECL_SOURCE_LOCATION (default_init_member),
4206 : "initialized member %q+D declared here",
4207 : default_init_member);
4208 12 : }
4209 : default_init_member = field;
4210 : }
4211 :
4212 : /* Now that we've removed bit-field widths from DECL_INITIAL,
4213 : anything left in DECL_INITIAL is an NSDMI that makes the class
4214 : non-aggregate in C++11, and non-layout-POD always. */
4215 16862754 : if (DECL_INITIAL (field))
4216 : {
4217 1373401 : if (cxx_dialect < cxx14)
4218 1002 : CLASSTYPE_NON_AGGREGATE (t) = true;
4219 : else
4220 1372399 : CLASSTYPE_NON_POD_AGGREGATE (t) = true;
4221 : }
4222 :
4223 16862754 : if (CP_TYPE_CONST_P (type))
4224 : {
4225 : /* If any field is const, the structure type is pseudo-const. */
4226 268466 : C_TYPE_FIELDS_READONLY (t) = 1;
4227 268466 : if (DECL_INITIAL (field) == NULL_TREE)
4228 223018 : SET_CLASSTYPE_READONLY_FIELDS_NEED_INIT (t, 1);
4229 268466 : if (cxx_dialect < cxx11)
4230 : {
4231 : /* ARM $12.6.2: [A member initializer list] (or, for an
4232 : aggregate, initialization by a brace-enclosed list) is the
4233 : only way to initialize non-static const and reference
4234 : members. */
4235 745 : TYPE_HAS_COMPLEX_COPY_ASSIGN (t) = 1;
4236 745 : TYPE_HAS_COMPLEX_MOVE_ASSIGN (t) = 1;
4237 : }
4238 : }
4239 : /* A field that is pseudo-const makes the structure likewise. */
4240 16594288 : else if (CLASS_TYPE_P (type))
4241 : {
4242 3424280 : C_TYPE_FIELDS_READONLY (t) |= C_TYPE_FIELDS_READONLY (type);
4243 3424280 : SET_CLASSTYPE_READONLY_FIELDS_NEED_INIT (t,
4244 : CLASSTYPE_READONLY_FIELDS_NEED_INIT (t)
4245 : | CLASSTYPE_READONLY_FIELDS_NEED_INIT (type));
4246 : }
4247 :
4248 : /* Core issue 80: A non-static data member is required to have a
4249 : different name from the class iff the class has a
4250 : user-declared constructor. */
4251 16862754 : if (constructor_name_p (DECL_NAME (field), t)
4252 16862754 : && TYPE_HAS_USER_CONSTRUCTOR (t))
4253 12 : permerror (DECL_SOURCE_LOCATION (field),
4254 : "field %q#D with same name as class", field);
4255 : }
4256 :
4257 : /* Per CWG 2096, a type is a literal type if it is a union, and at least
4258 : one of its non-static data members is of non-volatile literal type. */
4259 49090220 : if (TREE_CODE (t) == UNION_TYPE && found_nv_literal_p)
4260 414138 : CLASSTYPE_LITERAL_P (t) = true;
4261 :
4262 : /* Effective C++ rule 11: if a class has dynamic memory held by pointers,
4263 : it should also define a copy constructor and an assignment operator to
4264 : implement the correct copy semantic (deep vs shallow, etc.). As it is
4265 : not feasible to check whether the constructors do allocate dynamic memory
4266 : and store it within members, we approximate the warning like this:
4267 :
4268 : -- Warn only if there are members which are pointers
4269 : -- Warn only if there is a non-trivial constructor (otherwise,
4270 : there cannot be memory allocated).
4271 : -- Warn only if there is a non-trivial destructor. We assume that the
4272 : user at least implemented the cleanup correctly, and a destructor
4273 : is needed to free dynamic memory.
4274 :
4275 : This seems enough for practical purposes. */
4276 49090220 : if (warn_ecpp
4277 138 : && pointer_member
4278 15 : && TYPE_HAS_USER_CONSTRUCTOR (t)
4279 15 : && TYPE_HAS_NONTRIVIAL_DESTRUCTOR (t)
4280 49090232 : && !(TYPE_HAS_COPY_CTOR (t) && TYPE_HAS_COPY_ASSIGN (t)))
4281 : {
4282 9 : auto_diagnostic_group d;
4283 9 : if (warning (OPT_Weffc__, "%q#T has pointer data members", t))
4284 : {
4285 9 : if (! TYPE_HAS_COPY_CTOR (t))
4286 : {
4287 6 : warning (OPT_Weffc__,
4288 : " but does not declare %<%T(const %T&)%>", t, t);
4289 6 : if (!TYPE_HAS_COPY_ASSIGN (t))
4290 3 : warning (OPT_Weffc__, " or %<operator=(const %T&)%>", t);
4291 : }
4292 3 : else if (! TYPE_HAS_COPY_ASSIGN (t))
4293 3 : warning (OPT_Weffc__,
4294 : " but does not declare %<operator=(const %T&)%>", t);
4295 9 : inform (DECL_SOURCE_LOCATION (pointer_member),
4296 : "pointer member %q+D declared here", pointer_member);
4297 : }
4298 9 : }
4299 :
4300 : /* Non-static data member initializers make the default constructor
4301 : non-trivial. */
4302 49090220 : if (default_init_member)
4303 : {
4304 833064 : TYPE_NEEDS_CONSTRUCTING (t) = true;
4305 833064 : TYPE_HAS_COMPLEX_DFLT (t) = true;
4306 : }
4307 :
4308 : /* If any of the fields couldn't be packed, unset TYPE_PACKED. */
4309 49090220 : if (cant_pack)
4310 12 : TYPE_PACKED (t) = 0;
4311 :
4312 : /* Check anonymous struct/anonymous union fields. */
4313 49090220 : finish_struct_anon (t);
4314 :
4315 : /* We've built up the list of access declarations in reverse order.
4316 : Fix that now. */
4317 49090220 : *access_decls = nreverse (*access_decls);
4318 49090220 : }
4319 :
4320 : /* If TYPE is an empty class type, records its OFFSET in the table of
4321 : OFFSETS. */
4322 :
4323 : static int
4324 29156392 : record_subobject_offset (tree type, tree offset, splay_tree offsets)
4325 : {
4326 29156392 : splay_tree_node n;
4327 :
4328 29156392 : if (!is_empty_class (type))
4329 : return 0;
4330 :
4331 : /* Record the location of this empty object in OFFSETS. */
4332 26414995 : n = splay_tree_lookup (offsets, (splay_tree_key) offset);
4333 26414995 : if (!n)
4334 22268373 : n = splay_tree_insert (offsets,
4335 : (splay_tree_key) offset,
4336 : (splay_tree_value) NULL_TREE);
4337 52829990 : n->value = ((splay_tree_value)
4338 26414995 : tree_cons (NULL_TREE,
4339 : type,
4340 26414995 : (tree) n->value));
4341 :
4342 26414995 : return 0;
4343 : }
4344 :
4345 : /* Returns nonzero if TYPE is an empty class type and there is
4346 : already an entry in OFFSETS for the same TYPE as the same OFFSET. */
4347 :
4348 : static int
4349 627606 : check_subobject_offset (tree type, tree offset, splay_tree offsets)
4350 : {
4351 627606 : splay_tree_node n;
4352 627606 : tree t;
4353 :
4354 627606 : if (!is_empty_class (type))
4355 : return 0;
4356 :
4357 : /* Record the location of this empty object in OFFSETS. */
4358 536845 : n = splay_tree_lookup (offsets, (splay_tree_key) offset);
4359 536845 : if (!n)
4360 : return 0;
4361 :
4362 536747 : enum { ignore, fast, slow, warn }
4363 536747 : cv_check = (abi_version_crosses (19) ? slow
4364 536714 : : abi_version_at_least (19) ? fast
4365 0 : : ignore);
4366 3869521 : for (t = (tree) n->value; t; t = TREE_CHAIN (t))
4367 : {
4368 3335960 : tree elt = TREE_VALUE (t);
4369 :
4370 3335960 : if (same_type_p (elt, type))
4371 : return 1;
4372 :
4373 3332774 : if (cv_check != ignore
4374 3332774 : && similar_type_p (elt, type))
4375 : {
4376 12 : if (cv_check == fast)
4377 : return 1;
4378 : cv_check = warn;
4379 : }
4380 : }
4381 :
4382 533561 : if (cv_check == warn)
4383 : {
4384 12 : warning (OPT_Wabi, "layout of %qs member of type %qT changes in %qs",
4385 : "[[no_unique_address]]", type, "-fabi-version=19");
4386 12 : if (abi_version_at_least (19))
4387 : return 1;
4388 : }
4389 :
4390 : return 0;
4391 : }
4392 :
4393 : /* Walk through all the subobjects of TYPE (located at OFFSET). Call
4394 : F for every subobject, passing it the type, offset, and table of
4395 : OFFSETS. If VBASES_P is one, then virtual non-primary bases should
4396 : be traversed.
4397 :
4398 : If MAX_OFFSET is non-NULL, then subobjects with an offset greater
4399 : than MAX_OFFSET will not be walked.
4400 :
4401 : If F returns a nonzero value, the traversal ceases, and that value
4402 : is returned. Otherwise, returns zero. */
4403 :
4404 : static int
4405 53138588 : walk_subobject_offsets (tree type,
4406 : subobject_offset_fn f,
4407 : tree offset,
4408 : splay_tree offsets,
4409 : tree max_offset,
4410 : int vbases_p)
4411 : {
4412 53138588 : int r = 0;
4413 53138588 : tree type_binfo = NULL_TREE;
4414 :
4415 : /* If this OFFSET is bigger than the MAX_OFFSET, then we should
4416 : stop. */
4417 53138588 : if (max_offset && tree_int_cst_lt (max_offset, offset))
4418 : return 0;
4419 :
4420 44779559 : if (type == error_mark_node)
4421 : return 0;
4422 :
4423 44779559 : if (!TYPE_P (type))
4424 : {
4425 5831130 : type_binfo = type;
4426 5831130 : type = BINFO_TYPE (type);
4427 : }
4428 :
4429 44779559 : if (CLASS_TYPE_P (type))
4430 : {
4431 34472759 : tree field;
4432 34472759 : tree binfo;
4433 34472759 : int i;
4434 :
4435 : /* Avoid recursing into objects that are not interesting. */
4436 34472759 : if (!CLASSTYPE_CONTAINS_EMPTY_CLASS_P (type))
4437 : return 0;
4438 :
4439 : /* Record the location of TYPE. */
4440 29784433 : r = (*f) (type, offset, offsets);
4441 29784433 : if (r)
4442 : return r;
4443 :
4444 : /* Iterate through the direct base classes of TYPE. */
4445 29781235 : if (!type_binfo)
4446 24946287 : type_binfo = TYPE_BINFO (type);
4447 35456156 : for (i = 0; BINFO_BASE_ITERATE (type_binfo, i, binfo); i++)
4448 : {
4449 5676074 : tree binfo_offset;
4450 :
4451 5676074 : if (BINFO_VIRTUAL_P (binfo))
4452 1680 : continue;
4453 :
4454 5674394 : tree orig_binfo;
4455 : /* We cannot rely on BINFO_OFFSET being set for the base
4456 : class yet, but the offsets for direct non-virtual
4457 : bases can be calculated by going back to the TYPE. */
4458 5674394 : orig_binfo = BINFO_BASE_BINFO (TYPE_BINFO (type), i);
4459 5674394 : binfo_offset = size_binop (PLUS_EXPR,
4460 : offset,
4461 : BINFO_OFFSET (orig_binfo));
4462 :
4463 5674394 : r = walk_subobject_offsets (binfo,
4464 : f,
4465 : binfo_offset,
4466 : offsets,
4467 : max_offset,
4468 : /*vbases_p=*/0);
4469 5674394 : if (r)
4470 : return r;
4471 : }
4472 :
4473 29780082 : if (CLASSTYPE_VBASECLASSES (type))
4474 : {
4475 1369 : unsigned ix;
4476 1369 : vec<tree, va_gc> *vbases;
4477 :
4478 : /* Iterate through the virtual base classes of TYPE. In G++
4479 : 3.2, we included virtual bases in the direct base class
4480 : loop above, which results in incorrect results; the
4481 : correct offsets for virtual bases are only known when
4482 : working with the most derived type. */
4483 1369 : if (vbases_p)
4484 30 : for (vbases = CLASSTYPE_VBASECLASSES (type), ix = 0;
4485 30 : vec_safe_iterate (vbases, ix, &binfo); ix++)
4486 : {
4487 15 : r = walk_subobject_offsets (binfo,
4488 : f,
4489 15 : size_binop (PLUS_EXPR,
4490 : offset,
4491 : BINFO_OFFSET (binfo)),
4492 : offsets,
4493 : max_offset,
4494 : /*vbases_p=*/0);
4495 15 : if (r)
4496 : return r;
4497 : }
4498 : else
4499 : {
4500 : /* We still have to walk the primary base, if it is
4501 : virtual. (If it is non-virtual, then it was walked
4502 : above.) */
4503 1354 : tree vbase = get_primary_binfo (type_binfo);
4504 :
4505 423 : if (vbase && BINFO_VIRTUAL_P (vbase)
4506 262 : && BINFO_PRIMARY_P (vbase)
4507 1616 : && BINFO_INHERITANCE_CHAIN (vbase) == type_binfo)
4508 : {
4509 228 : r = (walk_subobject_offsets
4510 228 : (vbase, f, offset,
4511 : offsets, max_offset, /*vbases_p=*/0));
4512 228 : if (r)
4513 : return r;
4514 : }
4515 : }
4516 : }
4517 :
4518 : /* Iterate through the fields of TYPE. */
4519 570714495 : for (field = TYPE_FIELDS (type); field; field = DECL_CHAIN (field))
4520 540936829 : if (TREE_CODE (field) == FIELD_DECL
4521 10472998 : && TREE_TYPE (field) != error_mark_node
4522 551409783 : && !DECL_ARTIFICIAL (field))
4523 : {
4524 4773284 : tree field_offset;
4525 :
4526 4773284 : field_offset = byte_position (field);
4527 :
4528 4773284 : r = walk_subobject_offsets (TREE_TYPE (field),
4529 : f,
4530 : size_binop (PLUS_EXPR,
4531 : offset,
4532 : field_offset),
4533 : offsets,
4534 : max_offset,
4535 : /*vbases_p=*/1);
4536 4773284 : if (r)
4537 : return r;
4538 : }
4539 : }
4540 10306800 : else if (TREE_CODE (type) == ARRAY_TYPE)
4541 : {
4542 664492 : tree element_type = strip_array_types (type);
4543 664492 : tree domain = TYPE_DOMAIN (type);
4544 664492 : tree index;
4545 :
4546 : /* Avoid recursing into objects that are not interesting. */
4547 26127 : if (!CLASS_TYPE_P (element_type)
4548 26115 : || !CLASSTYPE_CONTAINS_EMPTY_CLASS_P (element_type)
4549 11934 : || !domain
4550 676407 : || integer_minus_onep (TYPE_MAX_VALUE (domain)))
4551 652794 : return 0;
4552 :
4553 : /* Step through each of the elements in the array. */
4554 11698 : for (index = size_zero_node;
4555 34100 : !tree_int_cst_lt (TYPE_MAX_VALUE (domain), index);
4556 22402 : index = size_binop (PLUS_EXPR, index, size_one_node))
4557 : {
4558 33132 : r = walk_subobject_offsets (TREE_TYPE (type),
4559 : f,
4560 : offset,
4561 : offsets,
4562 : max_offset,
4563 : /*vbases_p=*/1);
4564 33132 : if (r)
4565 : return r;
4566 33132 : offset = size_binop (PLUS_EXPR, offset,
4567 : TYPE_SIZE_UNIT (TREE_TYPE (type)));
4568 : /* If this new OFFSET is bigger than the MAX_OFFSET, then
4569 : there's no point in iterating through the remaining
4570 : elements of the array. */
4571 33132 : if (max_offset && tree_int_cst_lt (max_offset, offset))
4572 : break;
4573 : }
4574 : }
4575 :
4576 : return 0;
4577 : }
4578 :
4579 : /* Return true iff FIELD_DECL DECL is potentially overlapping. */
4580 :
4581 : static bool
4582 83571287 : field_poverlapping_p (tree decl)
4583 : {
4584 : /* Base fields are actually potentially overlapping, but C++ bases go through
4585 : a different code path based on binfos, and ObjC++ base fields are laid out
4586 : in objc-act, so we don't want layout_class_type to mess with them. */
4587 83571287 : if (DECL_FIELD_IS_BASE (decl))
4588 : {
4589 0 : gcc_checking_assert (c_dialect_objc ());
4590 : return false;
4591 : }
4592 :
4593 83571287 : return lookup_attribute ("no_unique_address",
4594 167142574 : DECL_ATTRIBUTES (decl));
4595 : }
4596 :
4597 : /* Return true iff DECL is an empty field, either for an empty base or a
4598 : [[no_unique_address]] data member. */
4599 :
4600 : bool
4601 484429408 : is_empty_field (tree decl)
4602 : {
4603 484429408 : if (!decl || TREE_CODE (decl) != FIELD_DECL)
4604 : return false;
4605 :
4606 97073972 : bool r = (is_empty_class (TREE_TYPE (decl))
4607 99687969 : && (DECL_FIELD_IS_BASE (decl)
4608 768585 : || field_poverlapping_p (decl)));
4609 :
4610 : /* Empty fields should have size zero. */
4611 2455642 : gcc_checking_assert (!r || integer_zerop (DECL_SIZE (decl)));
4612 :
4613 : return r;
4614 : }
4615 :
4616 : /* Record all of the empty subobjects of DECL_OR_BINFO. */
4617 :
4618 : static void
4619 40350436 : record_subobject_offsets (tree decl_or_binfo,
4620 : splay_tree offsets)
4621 : {
4622 40350436 : tree type, offset;
4623 40350436 : bool overlapping, vbases_p;
4624 :
4625 40350436 : if (DECL_P (decl_or_binfo))
4626 : {
4627 16862754 : tree decl = decl_or_binfo;
4628 16862754 : type = TREE_TYPE (decl);
4629 16862754 : offset = byte_position (decl);
4630 16862754 : overlapping = field_poverlapping_p (decl);
4631 16862754 : vbases_p = true;
4632 : }
4633 : else
4634 : {
4635 23487682 : type = BINFO_TYPE (decl_or_binfo);
4636 23487682 : offset = BINFO_OFFSET (decl_or_binfo);
4637 23487682 : overlapping = true;
4638 23487682 : vbases_p = false;
4639 : }
4640 :
4641 40350436 : tree max_offset;
4642 : /* If recording subobjects for a non-static data member or a
4643 : non-empty base class, we do not need to record offsets beyond
4644 : the size of the biggest empty class. Additional data members
4645 : will go at the end of the class. Additional base classes will go
4646 : either at offset zero (if empty, in which case they cannot
4647 : overlap with offsets past the size of the biggest empty class) or
4648 : at the end of the class.
4649 :
4650 : However, if we are placing an empty base class, then we must record
4651 : all offsets, as either the empty class is at offset zero (where
4652 : other empty classes might later be placed) or at the end of the
4653 : class (where other objects might then be placed, so other empty
4654 : subobjects might later overlap). */
4655 23487682 : if (!overlapping
4656 40350436 : || !is_empty_class (type))
4657 19176988 : max_offset = sizeof_biggest_empty_class;
4658 : else
4659 : max_offset = NULL_TREE;
4660 40350436 : walk_subobject_offsets (type, record_subobject_offset, offset,
4661 : offsets, max_offset, vbases_p);
4662 40350436 : }
4663 :
4664 : /* Returns nonzero if any of the empty subobjects of TYPE (located at
4665 : OFFSET) conflict with entries in OFFSETS. If VBASES_P is nonzero,
4666 : virtual bases of TYPE are examined. */
4667 :
4668 : static int
4669 39318952 : layout_conflict_p (tree type,
4670 : tree offset,
4671 : splay_tree offsets,
4672 : int vbases_p)
4673 : {
4674 39318952 : splay_tree_node max_node;
4675 :
4676 : /* Get the node in OFFSETS that indicates the maximum offset where
4677 : an empty subobject is located. */
4678 39318952 : max_node = splay_tree_max (offsets);
4679 : /* If there aren't any empty subobjects, then there's no point in
4680 : performing this check. */
4681 39318952 : if (!max_node)
4682 : return 0;
4683 :
4684 2306767 : return walk_subobject_offsets (type, check_subobject_offset, offset,
4685 2306767 : offsets, (tree) (max_node->key),
4686 2306767 : vbases_p);
4687 : }
4688 :
4689 : /* DECL is a FIELD_DECL corresponding either to a base subobject of a
4690 : non-static data member of the type indicated by RLI. BINFO is the
4691 : binfo corresponding to the base subobject, OFFSETS maps offsets to
4692 : types already located at those offsets. This function determines
4693 : the position of the DECL. */
4694 :
4695 : static void
4696 19177756 : layout_nonempty_base_or_field (record_layout_info rli,
4697 : tree decl,
4698 : tree binfo,
4699 : splay_tree offsets)
4700 : {
4701 19177756 : tree offset = NULL_TREE;
4702 19177756 : bool field_p;
4703 19177756 : tree type;
4704 :
4705 19177756 : if (binfo)
4706 : {
4707 : /* For the purposes of determining layout conflicts, we want to
4708 : use the class type of BINFO; TREE_TYPE (DECL) will be the
4709 : CLASSTYPE_AS_BASE version, which does not contain entries for
4710 : zero-sized bases. */
4711 2536849 : type = TREE_TYPE (binfo);
4712 2536849 : field_p = false;
4713 : }
4714 : else
4715 : {
4716 16640907 : type = TREE_TYPE (decl);
4717 16640907 : field_p = true;
4718 : }
4719 :
4720 : /* Try to place the field. It may take more than one try if we have
4721 : a hard time placing the field without putting two objects of the
4722 : same type at the same address. */
4723 233 : while (1)
4724 : {
4725 19177989 : struct record_layout_info_s old_rli = *rli;
4726 :
4727 : /* Place this field. */
4728 19177989 : place_field (rli, decl);
4729 19177989 : offset = byte_position (decl);
4730 :
4731 : /* We have to check to see whether or not there is already
4732 : something of the same type at the offset we're about to use.
4733 : For example, consider:
4734 :
4735 : struct S {};
4736 : struct T : public S { int i; };
4737 : struct U : public S, public T {};
4738 :
4739 : Here, we put S at offset zero in U. Then, we can't put T at
4740 : offset zero -- its S component would be at the same address
4741 : as the S we already allocated. So, we have to skip ahead.
4742 : Since all data members, including those whose type is an
4743 : empty class, have nonzero size, any overlap can happen only
4744 : with a direct or indirect base-class -- it can't happen with
4745 : a data member. */
4746 : /* In a union, overlap is permitted; all members are placed at
4747 : offset zero. */
4748 19177989 : if (TREE_CODE (rli->t) == UNION_TYPE)
4749 : break;
4750 20680630 : if (layout_conflict_p (field_p ? type : binfo, offset,
4751 : offsets, field_p))
4752 : {
4753 : /* Strip off the size allocated to this field. That puts us
4754 : at the first place we could have put the field with
4755 : proper alignment. */
4756 233 : *rli = old_rli;
4757 :
4758 : /* Bump up by the alignment required for the type. */
4759 233 : rli->bitpos
4760 233 : = size_binop (PLUS_EXPR, rli->bitpos,
4761 : bitsize_int (binfo
4762 : ? CLASSTYPE_ALIGN (type)
4763 : : TYPE_ALIGN (type)));
4764 233 : normalize_rli (rli);
4765 : }
4766 18143489 : else if (TREE_CODE (type) == NULLPTR_TYPE
4767 83059 : && warn_abi && abi_version_crosses (9))
4768 : {
4769 : /* Before ABI v9, we were giving nullptr_t alignment of 1; if
4770 : the offset wasn't aligned like a pointer when we started to
4771 : layout this field, that affects its position. */
4772 12 : tree pos = rli_size_unit_so_far (&old_rli);
4773 12 : if (int_cst_value (pos) % TYPE_ALIGN_UNIT (ptr_type_node) != 0)
4774 : {
4775 3 : if (abi_version_at_least (9))
4776 3 : warning_at (DECL_SOURCE_LOCATION (decl), OPT_Wabi,
4777 : "alignment of %qD increased in %<-fabi-version=9%> "
4778 : "(GCC 5.2)", decl);
4779 : else
4780 0 : warning_at (DECL_SOURCE_LOCATION (decl), OPT_Wabi, "alignment "
4781 : "of %qD will increase in %<-fabi-version=9%>",
4782 : decl);
4783 : }
4784 : break;
4785 : }
4786 : else
4787 : /* There was no conflict. We're done laying out this field. */
4788 : break;
4789 : }
4790 :
4791 : /* Now that we know where it will be placed, update its
4792 : BINFO_OFFSET. */
4793 21714605 : if (binfo && CLASS_TYPE_P (BINFO_TYPE (binfo)))
4794 : /* Indirect virtual bases may have a nonzero BINFO_OFFSET at
4795 : this point because their BINFO_OFFSET is copied from another
4796 : hierarchy. Therefore, we may not need to add the entire
4797 : OFFSET. */
4798 2536849 : propagate_binfo_offsets (binfo,
4799 : size_diffop_loc (input_location,
4800 : fold_convert (ssizetype, offset),
4801 2536849 : fold_convert (ssizetype,
4802 : BINFO_OFFSET (binfo))));
4803 19177756 : }
4804 :
4805 : /* Returns true if TYPE is empty and OFFSET is nonzero. */
4806 :
4807 : static int
4808 435 : empty_base_at_nonzero_offset_p (tree type,
4809 : tree offset,
4810 : splay_tree /*offsets*/)
4811 : {
4812 435 : return is_empty_class (type) && !integer_zerop (offset);
4813 : }
4814 :
4815 : /* Layout the empty base BINFO. EOC indicates the byte currently just
4816 : past the end of the class, and should be correctly aligned for a
4817 : class of the type indicated by BINFO; OFFSETS gives the offsets of
4818 : the empty bases allocated so far. T is the most derived
4819 : type. Return nonzero iff we added it at the end. */
4820 :
4821 : static bool
4822 21173448 : layout_empty_base_or_field (record_layout_info rli, tree binfo_or_decl,
4823 : splay_tree offsets)
4824 : {
4825 21173448 : tree alignment;
4826 21173448 : bool atend = false;
4827 21173448 : tree binfo = NULL_TREE;
4828 21173448 : tree decl = NULL_TREE;
4829 21173448 : tree type;
4830 21173448 : if (TREE_CODE (binfo_or_decl) == TREE_BINFO)
4831 : {
4832 20950833 : binfo = binfo_or_decl;
4833 20950833 : type = BINFO_TYPE (binfo);
4834 : }
4835 : else
4836 : {
4837 222615 : decl = binfo_or_decl;
4838 222615 : type = TREE_TYPE (decl);
4839 : }
4840 :
4841 : /* On some platforms (ARM), even empty classes will not be
4842 : byte-aligned. */
4843 21173448 : tree eoc = round_up_loc (input_location,
4844 : rli_size_unit_so_far (rli),
4845 21173448 : CLASSTYPE_ALIGN_UNIT (type));
4846 :
4847 : /* This routine should only be used for empty classes. */
4848 21173448 : gcc_assert (is_empty_class (type));
4849 :
4850 21173448 : if (decl && DECL_USER_ALIGN (decl))
4851 3 : alignment = size_int (DECL_ALIGN_UNIT (decl));
4852 : else
4853 21173445 : alignment = size_int (CLASSTYPE_ALIGN_UNIT (type));
4854 :
4855 : /* This is an empty base class. We first try to put it at offset
4856 : zero. */
4857 21173448 : tree offset = size_zero_node;
4858 21173448 : if (TREE_CODE (rli->t) != UNION_TYPE
4859 21173448 : && layout_conflict_p (type,
4860 : offset,
4861 : offsets,
4862 : /*vbases_p=*/0))
4863 : {
4864 : /* That didn't work. Now, we move forward from the next
4865 : available spot in the class. */
4866 2959 : atend = true;
4867 : offset = eoc;
4868 4339 : while (1)
4869 : {
4870 2959 : if (!layout_conflict_p (type,
4871 : offset,
4872 : offsets,
4873 : /*vbases_p=*/0))
4874 : /* We finally found a spot where there's no overlap. */
4875 : break;
4876 :
4877 : /* There's overlap here, too. Bump along to the next spot. */
4878 1380 : offset = size_binop (PLUS_EXPR, offset, alignment);
4879 : }
4880 : }
4881 :
4882 21173448 : if (decl && DECL_USER_ALIGN (decl))
4883 : {
4884 3 : rli->record_align = MAX (rli->record_align, DECL_ALIGN (decl));
4885 3 : if (warn_packed)
4886 0 : rli->unpacked_align = MAX (rli->unpacked_align, DECL_ALIGN (decl));
4887 3 : TYPE_USER_ALIGN (rli->t) = 1;
4888 : }
4889 21173445 : else if (CLASSTYPE_USER_ALIGN (type))
4890 : {
4891 21 : rli->record_align = MAX (rli->record_align, CLASSTYPE_ALIGN (type));
4892 21 : if (warn_packed)
4893 0 : rli->unpacked_align = MAX (rli->unpacked_align, CLASSTYPE_ALIGN (type));
4894 21 : TYPE_USER_ALIGN (rli->t) = 1;
4895 : }
4896 :
4897 21173448 : if (binfo)
4898 : /* Adjust BINFO_OFFSET (binfo) to be exactly OFFSET. */
4899 41901666 : propagate_binfo_offsets (binfo,
4900 20950833 : size_diffop (offset, BINFO_OFFSET (binfo)));
4901 : else
4902 : {
4903 222615 : DECL_FIELD_OFFSET (decl) = offset;
4904 222615 : DECL_FIELD_BIT_OFFSET (decl) = bitsize_zero_node;
4905 222615 : SET_DECL_OFFSET_ALIGN (decl, BITS_PER_UNIT);
4906 : }
4907 :
4908 21173448 : return atend;
4909 : }
4910 :
4911 : /* Build the FIELD_DECL for BASETYPE as a base of T, add it to the chain of
4912 : fields at NEXT_FIELD, and return it. */
4913 :
4914 : static tree
4915 23409821 : build_base_field_1 (tree t, tree binfo, tree access, tree *&next_field)
4916 : {
4917 : /* Create the FIELD_DECL. */
4918 23409821 : tree basetype = BINFO_TYPE (binfo);
4919 23409821 : tree as_base = CLASSTYPE_AS_BASE (basetype);
4920 23409821 : gcc_assert (as_base);
4921 23409821 : tree decl = build_decl (input_location, FIELD_DECL, NULL_TREE, as_base);
4922 :
4923 23409821 : DECL_ARTIFICIAL (decl) = 1;
4924 23409821 : DECL_IGNORED_P (decl) = 1;
4925 23409821 : DECL_FIELD_CONTEXT (decl) = t;
4926 23409821 : if (is_empty_class (basetype))
4927 : /* CLASSTYPE_SIZE is one byte, but the field needs to have size zero. */
4928 20872972 : DECL_SIZE (decl) = DECL_SIZE_UNIT (decl) = size_zero_node;
4929 : else
4930 : {
4931 2536849 : DECL_SIZE (decl) = CLASSTYPE_SIZE (basetype);
4932 2536849 : DECL_SIZE_UNIT (decl) = CLASSTYPE_SIZE_UNIT (basetype);
4933 : }
4934 23409821 : SET_DECL_ALIGN (decl, CLASSTYPE_ALIGN (basetype));
4935 23409821 : DECL_USER_ALIGN (decl) = CLASSTYPE_USER_ALIGN (basetype);
4936 23409821 : SET_DECL_MODE (decl, TYPE_MODE (basetype));
4937 23409821 : DECL_FIELD_IS_BASE (decl) = 1;
4938 :
4939 23409821 : if (access == access_private_node)
4940 436417 : TREE_PRIVATE (decl) = true;
4941 22973404 : else if (access == access_protected_node)
4942 86225 : TREE_PROTECTED (decl) = true;
4943 :
4944 : /* Add the new FIELD_DECL to the list of fields for T. */
4945 23409821 : DECL_CHAIN (decl) = *next_field;
4946 23409821 : *next_field = decl;
4947 23409821 : next_field = &DECL_CHAIN (decl);
4948 :
4949 23409821 : return decl;
4950 : }
4951 :
4952 : /* Layout the base given by BINFO in the class indicated by RLI.
4953 : *BASE_ALIGN is a running maximum of the alignments of
4954 : any base class. OFFSETS gives the location of empty base
4955 : subobjects. T is the most derived type. Return nonzero if the new
4956 : object cannot be nearly-empty. A new FIELD_DECL is inserted at
4957 : *NEXT_FIELD, unless BINFO is for an empty base class.
4958 :
4959 : Returns the location at which the next field should be inserted. */
4960 :
4961 : static tree *
4962 23487682 : build_base_field (record_layout_info rli, tree binfo, tree access,
4963 : splay_tree offsets, tree *next_field)
4964 : {
4965 23487682 : tree t = rli->t;
4966 23487682 : tree basetype = BINFO_TYPE (binfo);
4967 :
4968 23487682 : if (!COMPLETE_TYPE_P (basetype))
4969 : /* This error is now reported in xref_tag, thus giving better
4970 : location information. */
4971 0 : return next_field;
4972 :
4973 : /* Place the base class. */
4974 23487682 : if (!is_empty_class (basetype))
4975 : {
4976 2536849 : tree decl;
4977 :
4978 : /* The containing class is non-empty because it has a non-empty
4979 : base class. */
4980 2536849 : CLASSTYPE_EMPTY_P (t) = 0;
4981 :
4982 : /* Create the FIELD_DECL. */
4983 2536849 : decl = build_base_field_1 (t, binfo, access, next_field);
4984 :
4985 : /* Try to place the field. It may take more than one try if we
4986 : have a hard time placing the field without putting two
4987 : objects of the same type at the same address. */
4988 2536849 : layout_nonempty_base_or_field (rli, decl, binfo, offsets);
4989 : }
4990 : else
4991 : {
4992 20950833 : bool atend = layout_empty_base_or_field (rli, binfo, offsets);
4993 : /* A nearly-empty class "has no proper base class that is empty,
4994 : not morally virtual, and at an offset other than zero." */
4995 20950833 : if (!BINFO_VIRTUAL_P (binfo) && CLASSTYPE_NEARLY_EMPTY_P (t))
4996 : {
4997 426 : if (atend)
4998 94 : CLASSTYPE_NEARLY_EMPTY_P (t) = 0;
4999 : /* The check above (used in G++ 3.2) is insufficient because
5000 : an empty class placed at offset zero might itself have an
5001 : empty base at a nonzero offset. */
5002 332 : else if (walk_subobject_offsets (basetype,
5003 : empty_base_at_nonzero_offset_p,
5004 : size_zero_node,
5005 : /*offsets=*/NULL,
5006 : /*max_offset=*/NULL_TREE,
5007 : /*vbases_p=*/true))
5008 6 : CLASSTYPE_NEARLY_EMPTY_P (t) = 0;
5009 : }
5010 :
5011 : /* We used to not create a FIELD_DECL for empty base classes because of
5012 : back end issues with overlapping FIELD_DECLs, but that doesn't seem to
5013 : be a problem anymore. We need them to handle initialization of C++17
5014 : aggregate bases. */
5015 41825506 : if (cxx_dialect >= cxx17 && !BINFO_VIRTUAL_P (binfo))
5016 : {
5017 20872972 : tree decl = build_base_field_1 (t, binfo, access, next_field);
5018 20872972 : DECL_FIELD_OFFSET (decl) = BINFO_OFFSET (binfo);
5019 20872972 : DECL_FIELD_BIT_OFFSET (decl) = bitsize_zero_node;
5020 20872972 : SET_DECL_OFFSET_ALIGN (decl, BITS_PER_UNIT);
5021 20872972 : SET_DECL_FIELD_ABI_IGNORED (decl, 1);
5022 : }
5023 :
5024 : /* An empty virtual base causes a class to be non-empty
5025 : -- but in that case we do not need to clear CLASSTYPE_EMPTY_P
5026 : here because that was already done when the virtual table
5027 : pointer was created. */
5028 : }
5029 :
5030 : /* Record the offsets of BINFO and its base subobjects. */
5031 23487682 : record_subobject_offsets (binfo, offsets);
5032 :
5033 23487682 : return next_field;
5034 : }
5035 :
5036 : /* Layout all of the non-virtual base classes. Record empty
5037 : subobjects in OFFSETS. T is the most derived type. Return nonzero
5038 : if the type cannot be nearly empty. The fields created
5039 : corresponding to the base classes will be inserted at
5040 : *NEXT_FIELD. */
5041 :
5042 : static void
5043 49090220 : build_base_fields (record_layout_info rli,
5044 : splay_tree offsets, tree *next_field)
5045 : {
5046 : /* Chain to hold all the new FIELD_DECLs which stand in for base class
5047 : subobjects. */
5048 49090220 : tree t = rli->t;
5049 49090220 : tree binfo = TYPE_BINFO (t);
5050 49090220 : int n_baseclasses = BINFO_N_BASE_BINFOS (binfo);
5051 :
5052 : /* The primary base class is always allocated first. */
5053 49090220 : const tree primary_binfo = CLASSTYPE_PRIMARY_BINFO (t);
5054 49090220 : if (primary_binfo)
5055 : {
5056 : /* We need to walk BINFO_BASE_BINFO to find the access of the primary
5057 : base, if it is direct. Indirect base fields are private. */
5058 1466751 : tree primary_access = access_private_node;
5059 1467632 : for (int i = 0; i < n_baseclasses; ++i)
5060 : {
5061 1467561 : tree base_binfo = BINFO_BASE_BINFO (binfo, i);
5062 1467561 : if (base_binfo == primary_binfo)
5063 : {
5064 1466680 : primary_access = BINFO_BASE_ACCESS (binfo, i);
5065 1466680 : break;
5066 : }
5067 : }
5068 1466751 : next_field = build_base_field (rli, primary_binfo,
5069 : primary_access,
5070 : offsets, next_field);
5071 : }
5072 :
5073 : /* Now allocate the rest of the bases. */
5074 72438305 : for (int i = 0; i < n_baseclasses; ++i)
5075 : {
5076 23348085 : tree base_binfo = BINFO_BASE_BINFO (binfo, i);
5077 :
5078 : /* The primary base was already allocated above, so we don't
5079 : need to allocate it again here. */
5080 23348085 : if (base_binfo == primary_binfo)
5081 1466680 : continue;
5082 :
5083 : /* Virtual bases are added at the end (a primary virtual base
5084 : will have already been added). */
5085 21881405 : if (BINFO_VIRTUAL_P (base_binfo))
5086 44427 : continue;
5087 :
5088 21836978 : next_field = build_base_field (rli, base_binfo,
5089 21836978 : BINFO_BASE_ACCESS (binfo, i),
5090 : offsets, next_field);
5091 : }
5092 49090220 : }
5093 :
5094 : /* Go through the TYPE_FIELDS of T issuing any appropriate
5095 : diagnostics, figuring out which methods override which other
5096 : methods, and so forth. */
5097 :
5098 : static void
5099 49090220 : check_methods (tree t)
5100 : {
5101 317487398 : for (tree x = TYPE_FIELDS (t); x; x = DECL_CHAIN (x))
5102 268397178 : if (DECL_DECLARES_FUNCTION_P (x))
5103 : {
5104 134054388 : check_for_override (x, t);
5105 :
5106 134054388 : if (DECL_PURE_VIRTUAL_P (x)
5107 134054388 : && (TREE_CODE (x) != FUNCTION_DECL || ! DECL_VINDEX (x)))
5108 3 : error ("initializer specified for non-virtual method %q+D", x);
5109 : /* The name of the field is the original field name
5110 : Save this in auxiliary field for later overloading. */
5111 134054388 : if (TREE_CODE (x) == FUNCTION_DECL && DECL_VINDEX (x))
5112 : {
5113 5980392 : TYPE_POLYMORPHIC_P (t) = 1;
5114 5980392 : if (DECL_PURE_VIRTUAL_P (x))
5115 723767 : vec_safe_push (CLASSTYPE_PURE_VIRTUALS (t), x);
5116 : }
5117 :
5118 134054388 : if (!DECL_VIRTUAL_P (x)
5119 262128400 : && lookup_attribute ("transaction_safe_dynamic",
5120 128074012 : DECL_ATTRIBUTES (x)))
5121 2 : error_at (DECL_SOURCE_LOCATION (x),
5122 : "%<transaction_safe_dynamic%> may only be specified for "
5123 : "a virtual function");
5124 : }
5125 :
5126 : /* Check whether the eligible special member functions (P0848) are
5127 : user-provided. add_method arranged that the CLASSTYPE_MEMBER_VEC only
5128 : has the eligible ones, unless none are eligible; TYPE_FIELDS also contains
5129 : ineligible overloads, which is why this needs to be separate from the loop
5130 : above. */
5131 :
5132 49090220 : if (tree dtor = CLASSTYPE_DESTRUCTOR (t))
5133 : {
5134 3589240 : if (TREE_CODE (dtor) == OVERLOAD)
5135 : {
5136 : /* P0848: At the end of the definition of a class, overload
5137 : resolution is performed among the prospective destructors declared
5138 : in that class with an empty argument list to select the destructor
5139 : for the class, also known as the selected destructor. The program
5140 : is ill-formed if overload resolution fails. */
5141 6 : int viable = 0;
5142 24 : for (tree fn : ovl_range (dtor))
5143 12 : if (constraints_satisfied_p (fn))
5144 6 : ++viable;
5145 6 : gcc_checking_assert (viable != 1);
5146 :
5147 6 : auto_diagnostic_group d;
5148 6 : if (viable == 0)
5149 3 : error_at (location_of (t), "no viable destructor for %qT", t);
5150 : else
5151 3 : error_at (location_of (t), "destructor for %qT is ambiguous", t);
5152 6 : print_candidates (location_of (t), dtor);
5153 :
5154 : /* Arbitrarily prune the overload set to a single function for
5155 : sake of error recovery. */
5156 6 : tree *slot = find_member_slot (t, dtor_identifier);
5157 6 : *slot = get_first_fn (dtor);
5158 6 : }
5159 3589234 : else if (user_provided_p (dtor))
5160 2781578 : TYPE_HAS_NONTRIVIAL_DESTRUCTOR (t) = true;
5161 : }
5162 :
5163 97879455 : for (tree fn : ovl_range (CLASSTYPE_CONSTRUCTORS (t)))
5164 : {
5165 27698369 : if (!user_provided_p (fn))
5166 : /* Might be trivial. */;
5167 21750387 : else if (TREE_CODE (fn) == TEMPLATE_DECL)
5168 : /* Templates are never special members. */;
5169 14059428 : else if (copy_fn_p (fn)
5170 14059428 : && constraints_satisfied_p (fn))
5171 1011552 : TYPE_HAS_COMPLEX_COPY_CTOR (t) = true;
5172 13047876 : else if (move_fn_p (fn)
5173 13047876 : && constraints_satisfied_p (fn))
5174 904311 : TYPE_HAS_COMPLEX_MOVE_CTOR (t) = true;
5175 : }
5176 :
5177 61423740 : for (tree fn : ovl_range (get_class_binding_direct (t, assign_op_identifier)))
5178 : {
5179 7908940 : if (!user_provided_p (fn))
5180 : /* Might be trivial. */;
5181 4122978 : else if (TREE_CODE (fn) == TEMPLATE_DECL)
5182 : /* Templates are never special members. */;
5183 3029489 : else if (copy_fn_p (fn)
5184 3029489 : && constraints_satisfied_p (fn))
5185 644231 : TYPE_HAS_COMPLEX_COPY_ASSIGN (t) = true;
5186 2385258 : else if (move_fn_p (fn)
5187 2385258 : && constraints_satisfied_p (fn))
5188 857126 : TYPE_HAS_COMPLEX_MOVE_ASSIGN (t) = true;
5189 : }
5190 49090220 : }
5191 :
5192 : /* FN is constructor, destructor or operator function. Clone the
5193 : declaration to create a NAME'd variant. NEED_VTT_PARM_P and
5194 : OMIT_INHERITED_PARMS_P are relevant if it's a cdtor. */
5195 :
5196 : static tree
5197 126345536 : copy_fndecl_with_name (tree fn, tree name, tree_code code,
5198 : bool need_vtt_parm_p, bool omit_inherited_parms_p)
5199 : {
5200 : /* Copy the function. */
5201 126345536 : tree clone = copy_decl (fn);
5202 : /* Reset the function name. */
5203 126345536 : DECL_NAME (clone) = name;
5204 :
5205 126345536 : if (flag_concepts)
5206 : /* Clone constraints. */
5207 125051278 : if (tree ci = get_constraints (fn))
5208 11734742 : set_constraints (clone, copy_node (ci));
5209 :
5210 126345536 : SET_DECL_ASSEMBLER_NAME (clone, NULL_TREE);
5211 126345536 : DECL_ABSTRACT_P (clone) = false;
5212 : /* There's no pending inline data for this function. */
5213 126345536 : DECL_PENDING_INLINE_INFO (clone) = NULL;
5214 126345536 : DECL_PENDING_INLINE_P (clone) = 0;
5215 :
5216 126345536 : if (name == base_dtor_identifier)
5217 : {
5218 : /* The base-class destructor is not virtual. */
5219 10511248 : DECL_VIRTUAL_P (clone) = 0;
5220 10511248 : DECL_VINDEX (clone) = NULL_TREE;
5221 : }
5222 115834288 : else if (code != ERROR_MARK)
5223 : {
5224 : /* Set the operator code. */
5225 672 : const ovl_op_info_t *ovl_op = OVL_OP_INFO (false, code);
5226 672 : DECL_OVERLOADED_OPERATOR_CODE_RAW (clone) = ovl_op->ovl_op_code;
5227 :
5228 : /* The operator could be virtual. */
5229 672 : if (DECL_VIRTUAL_P (clone))
5230 12 : IDENTIFIER_VIRTUAL_P (name) = true;
5231 : }
5232 :
5233 126345536 : if (omit_inherited_parms_p)
5234 120 : gcc_assert (DECL_HAS_IN_CHARGE_PARM_P (clone));
5235 :
5236 : /* If there was an in-charge parameter, drop it from the function
5237 : type. */
5238 126345536 : if (DECL_HAS_IN_CHARGE_PARM_P (clone))
5239 : {
5240 2414026 : tree basetype = TYPE_METHOD_BASETYPE (TREE_TYPE (clone));
5241 2414026 : tree parmtypes = TYPE_ARG_TYPES (TREE_TYPE (clone));
5242 : /* Skip the `this' parameter. */
5243 2414026 : parmtypes = TREE_CHAIN (parmtypes);
5244 : /* Skip the in-charge parameter. */
5245 2414026 : parmtypes = TREE_CHAIN (parmtypes);
5246 : /* And the VTT parm, in a complete [cd]tor. */
5247 2414026 : if (DECL_HAS_VTT_PARM_P (fn) && !need_vtt_parm_p)
5248 1294212 : parmtypes = TREE_CHAIN (parmtypes);
5249 2414026 : if (omit_inherited_parms_p)
5250 : {
5251 : /* If we're omitting inherited parms, that just leaves the VTT. */
5252 120 : gcc_assert (need_vtt_parm_p);
5253 120 : parmtypes = tree_cons (NULL_TREE, vtt_parm_type, void_list_node);
5254 : }
5255 2414026 : TREE_TYPE (clone)
5256 2414026 : = build_method_type_directly (basetype,
5257 2414026 : TREE_TYPE (TREE_TYPE (clone)),
5258 : parmtypes);
5259 2414026 : TREE_TYPE (clone)
5260 2414026 : = cp_build_type_attribute_variant (TREE_TYPE (clone),
5261 2414026 : TYPE_ATTRIBUTES (TREE_TYPE (fn)));
5262 2414026 : TREE_TYPE (clone)
5263 4828052 : = cxx_copy_lang_qualifiers (TREE_TYPE (clone), TREE_TYPE (fn));
5264 : }
5265 :
5266 : /* Copy the function parameters. */
5267 126345536 : DECL_ARGUMENTS (clone) = copy_list (DECL_ARGUMENTS (clone));
5268 :
5269 : /* Remove the in-charge parameter. */
5270 126345536 : if (DECL_HAS_IN_CHARGE_PARM_P (clone))
5271 : {
5272 2414026 : DECL_CHAIN (DECL_ARGUMENTS (clone))
5273 2414026 : = DECL_CHAIN (DECL_CHAIN (DECL_ARGUMENTS (clone)));
5274 2414026 : DECL_HAS_IN_CHARGE_PARM_P (clone) = 0;
5275 : }
5276 :
5277 : /* And the VTT parm, in a complete [cd]tor. */
5278 126345536 : if (DECL_HAS_VTT_PARM_P (fn))
5279 : {
5280 2414026 : if (need_vtt_parm_p)
5281 1119814 : DECL_HAS_VTT_PARM_P (clone) = 1;
5282 : else
5283 : {
5284 2588424 : DECL_CHAIN (DECL_ARGUMENTS (clone))
5285 1294212 : = DECL_CHAIN (DECL_CHAIN (DECL_ARGUMENTS (clone)));
5286 1294212 : DECL_HAS_VTT_PARM_P (clone) = 0;
5287 : }
5288 : }
5289 :
5290 : /* A base constructor inheriting from a virtual base doesn't get the
5291 : arguments. */
5292 126345536 : if (omit_inherited_parms_p)
5293 120 : DECL_CHAIN (DECL_CHAIN (DECL_ARGUMENTS (clone))) = NULL_TREE;
5294 :
5295 388801477 : for (tree parms = DECL_ARGUMENTS (clone); parms; parms = DECL_CHAIN (parms))
5296 : {
5297 262455941 : DECL_CONTEXT (parms) = clone;
5298 262455941 : cxx_dup_lang_specific_decl (parms);
5299 : }
5300 :
5301 : /* Create the RTL for this function. */
5302 126345536 : SET_DECL_RTL (clone, NULL);
5303 :
5304 : /* Regardless of the current scope, this is a member function, so
5305 : not at namespace scope. */
5306 126345536 : rest_of_decl_compilation (clone, /*top_level=*/0, at_eof);
5307 :
5308 126345536 : return clone;
5309 : }
5310 :
5311 : /* FN is an operator function, create a variant for CODE. */
5312 :
5313 : tree
5314 672 : copy_operator_fn (tree fn, tree_code code)
5315 : {
5316 672 : return copy_fndecl_with_name (fn, ovl_op_identifier (code),
5317 672 : code, false, false);
5318 : }
5319 :
5320 : /* FN is a constructor or destructor. Clone the declaration to create
5321 : a specialized in-charge or not-in-charge version, as indicated by
5322 : NAME. */
5323 :
5324 : static tree
5325 143701904 : build_clone (tree fn, tree name, bool need_vtt_parm_p,
5326 : bool omit_inherited_parms_p)
5327 : {
5328 143701904 : tree clone;
5329 :
5330 : /* If this is a template, do the rest on the DECL_TEMPLATE_RESULT. */
5331 143701904 : if (TREE_CODE (fn) == TEMPLATE_DECL)
5332 : {
5333 17357040 : clone = copy_decl (fn);
5334 17357040 : DECL_NAME (clone) = name;
5335 :
5336 17357040 : tree result = build_clone (DECL_TEMPLATE_RESULT (clone), name,
5337 : need_vtt_parm_p, omit_inherited_parms_p);
5338 17357040 : DECL_TEMPLATE_RESULT (clone) = result;
5339 :
5340 17357040 : DECL_TEMPLATE_INFO (result) = copy_node (DECL_TEMPLATE_INFO (result));
5341 17357040 : DECL_TI_TEMPLATE (result) = clone;
5342 :
5343 17357040 : TREE_TYPE (clone) = TREE_TYPE (result);
5344 : }
5345 : else
5346 : {
5347 126344864 : clone = copy_fndecl_with_name (fn, name, ERROR_MARK,
5348 : need_vtt_parm_p, omit_inherited_parms_p);
5349 126344864 : DECL_CLONED_FUNCTION (clone) = fn;
5350 :
5351 126344864 : maybe_prepare_return_this (clone);
5352 : }
5353 :
5354 : /* Remember where this function came from. */
5355 143701904 : DECL_ABSTRACT_ORIGIN (clone) = fn;
5356 :
5357 : /* Make it easy to find the CLONE given the FN. Note the
5358 : template_result of a template will be chained this way too. */
5359 143701904 : DECL_CHAIN (clone) = DECL_CHAIN (fn);
5360 143701904 : DECL_CHAIN (fn) = clone;
5361 :
5362 143701904 : return clone;
5363 : }
5364 :
5365 : /* Build the clones of FN, return the number of clones built. These
5366 : will be inserted onto DECL_CHAIN of FN. */
5367 :
5368 : void
5369 62374043 : build_cdtor_clones (tree fn, bool needs_vtt_p, bool base_omits_inherited_p,
5370 : bool update_methods)
5371 : {
5372 62374043 : unsigned count = 0;
5373 :
5374 62374043 : if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (fn))
5375 : {
5376 : /* For each constructor, we need two variants: an in-charge version
5377 : and a not-in-charge version. */
5378 51862795 : build_clone (fn, complete_ctor_identifier, false, false);
5379 51862795 : build_clone (fn, base_ctor_identifier, needs_vtt_p,
5380 : base_omits_inherited_p);
5381 51862795 : count += 2;
5382 : }
5383 : else
5384 : {
5385 10511248 : gcc_assert (DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P (fn));
5386 :
5387 : /* For each destructor, we need three variants: an in-charge
5388 : version, a not-in-charge version, and an in-charge deleting
5389 : version. We clone the deleting version first because that
5390 : means it will go second on the TYPE_FIELDS list -- and that
5391 : corresponds to the correct layout order in the virtual
5392 : function table.
5393 :
5394 : For a non-virtual destructor, we do not build a deleting
5395 : destructor. */
5396 10511248 : if (DECL_VIRTUAL_P (fn))
5397 : {
5398 1596778 : build_clone (fn, deleting_dtor_identifier, false, false);
5399 1596778 : count++;
5400 : }
5401 10511248 : build_clone (fn, complete_dtor_identifier, false, false);
5402 10511248 : build_clone (fn, base_dtor_identifier, needs_vtt_p, false);
5403 10511248 : count += 2;
5404 : }
5405 :
5406 : /* The original is now an abstract function that is never
5407 : emitted. */
5408 62374043 : DECL_ABSTRACT_P (fn) = true;
5409 :
5410 62374043 : if (update_methods)
5411 159604566 : for (tree clone = fn; count--;)
5412 : {
5413 106934839 : clone = DECL_CHAIN (clone);
5414 106934839 : add_method (DECL_CONTEXT (clone), clone, false);
5415 : }
5416 62374043 : }
5417 :
5418 : /* Produce declarations for all appropriate clones of FN. If
5419 : UPDATE_METHODS is true, the clones are added to the
5420 : CLASSTYPE_MEMBER_VEC. */
5421 :
5422 : void
5423 62684881 : clone_cdtor (tree fn, bool update_methods)
5424 : {
5425 : /* Avoid inappropriate cloning. */
5426 62684881 : if (DECL_CHAIN (fn)
5427 62684881 : && DECL_CLONED_FUNCTION_P (DECL_CHAIN (fn)))
5428 : return;
5429 :
5430 : /* Base cdtors need a vtt parm if there are virtual bases. */
5431 62329857 : bool vtt = CLASSTYPE_VBASECLASSES (DECL_CONTEXT (fn));
5432 :
5433 : /* Base ctor omits inherited parms it needs a vttparm and inherited
5434 : from a virtual nase ctor. */
5435 62329857 : bool base_omits_inherited = (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (fn)
5436 62329857 : && base_ctor_omit_inherited_parms (fn));
5437 :
5438 62329857 : build_cdtor_clones (fn, vtt, base_omits_inherited, update_methods);
5439 : }
5440 :
5441 : /* DECL is an in charge constructor, which is being defined. This will
5442 : have had an in class declaration, from whence clones were
5443 : declared. An out-of-class definition can specify additional default
5444 : arguments. As it is the clones that are involved in overload
5445 : resolution, we must propagate the information from the DECL to its
5446 : clones. */
5447 :
5448 : void
5449 19642353 : adjust_clone_args (tree decl)
5450 : {
5451 19642353 : tree clone;
5452 :
5453 32314209 : for (clone = DECL_CHAIN (decl); clone && DECL_CLONED_FUNCTION_P (clone);
5454 12671856 : clone = DECL_CHAIN (clone))
5455 : {
5456 12671856 : tree orig_clone_parms = TYPE_ARG_TYPES (TREE_TYPE (clone));
5457 12671856 : tree orig_decl_parms = TYPE_ARG_TYPES (TREE_TYPE (decl));
5458 12671856 : tree decl_parms, clone_parms;
5459 :
5460 : /* Skip the 'this' parameter. */
5461 12671856 : orig_clone_parms = TREE_CHAIN (orig_clone_parms);
5462 12671856 : orig_decl_parms = TREE_CHAIN (orig_decl_parms);
5463 :
5464 12671856 : if (DECL_HAS_IN_CHARGE_PARM_P (decl))
5465 18684 : orig_decl_parms = TREE_CHAIN (orig_decl_parms);
5466 12671856 : if (DECL_HAS_VTT_PARM_P (decl))
5467 18684 : orig_decl_parms = TREE_CHAIN (orig_decl_parms);
5468 :
5469 12671856 : clone_parms = orig_clone_parms;
5470 12671856 : if (DECL_HAS_VTT_PARM_P (clone))
5471 9342 : clone_parms = TREE_CHAIN (clone_parms);
5472 :
5473 25633414 : for (decl_parms = orig_decl_parms; decl_parms;
5474 12961558 : decl_parms = TREE_CHAIN (decl_parms),
5475 12961558 : clone_parms = TREE_CHAIN (clone_parms))
5476 : {
5477 25631770 : if (clone_parms == void_list_node)
5478 : {
5479 12670188 : gcc_assert (decl_parms == clone_parms
5480 : || ctor_omit_inherited_parms (clone));
5481 : break;
5482 : }
5483 :
5484 12961582 : gcc_checking_assert (same_type_p (TREE_VALUE (decl_parms),
5485 : TREE_VALUE (clone_parms)));
5486 :
5487 14080618 : if (TREE_PURPOSE (decl_parms) && !TREE_PURPOSE (clone_parms))
5488 : {
5489 : /* A default parameter has been added. Adjust the
5490 : clone's parameters. */
5491 24 : clone_parms = orig_decl_parms;
5492 :
5493 24 : if (DECL_HAS_VTT_PARM_P (clone))
5494 : {
5495 3 : clone_parms = tree_cons (TREE_PURPOSE (orig_clone_parms),
5496 3 : TREE_VALUE (orig_clone_parms),
5497 : clone_parms);
5498 3 : TREE_TYPE (clone_parms) = TREE_TYPE (orig_clone_parms);
5499 : }
5500 :
5501 24 : tree basetype = TYPE_METHOD_BASETYPE (TREE_TYPE (clone));
5502 24 : tree type
5503 24 : = build_method_type_directly (basetype,
5504 24 : TREE_TYPE (TREE_TYPE (clone)),
5505 : clone_parms);
5506 24 : if (tree attrs = TYPE_ATTRIBUTES (TREE_TYPE (clone)))
5507 0 : type = cp_build_type_attribute_variant (type, attrs);
5508 24 : type = cxx_copy_lang_qualifiers (type, TREE_TYPE (clone));
5509 24 : TREE_TYPE (clone) = type;
5510 :
5511 24 : clone_parms = NULL_TREE;
5512 24 : break;
5513 : }
5514 : }
5515 12671856 : gcc_assert (!clone_parms || clone_parms == void_list_node);
5516 : }
5517 19642353 : }
5518 :
5519 : /* For each of the constructors and destructors in T, create an
5520 : in-charge and not-in-charge variant. */
5521 :
5522 : static void
5523 49090220 : clone_constructors_and_destructors (tree t)
5524 : {
5525 : /* We do not need to propagate the usingness to the clone, at this
5526 : point that is not needed. */
5527 98739390 : for (tree fn : ovl_range (CLASSTYPE_CONSTRUCTORS (t)))
5528 28128341 : clone_cdtor (fn, /*update_methods=*/true);
5529 :
5530 49090220 : if (tree dtor = CLASSTYPE_DESTRUCTOR (t))
5531 3770793 : clone_cdtor (dtor, /*update_methods=*/true);
5532 49090220 : }
5533 :
5534 : /* Deduce noexcept for a destructor DTOR. */
5535 :
5536 : void
5537 3650302 : deduce_noexcept_on_destructor (tree dtor)
5538 : {
5539 3650302 : if (!TYPE_RAISES_EXCEPTIONS (TREE_TYPE (dtor)))
5540 2455046 : TREE_TYPE (dtor) = build_exception_variant (TREE_TYPE (dtor),
5541 : noexcept_deferred_spec);
5542 3650302 : }
5543 :
5544 : /* Subroutine of set_one_vmethod_tm_attributes. Search base classes
5545 : of TYPE for virtual functions which FNDECL overrides. Return a
5546 : mask of the tm attributes found therein. */
5547 :
5548 : static int
5549 925 : look_for_tm_attr_overrides (tree type, tree fndecl)
5550 : {
5551 925 : tree binfo = TYPE_BINFO (type);
5552 925 : tree base_binfo;
5553 925 : int ix, found = 0;
5554 :
5555 1549 : for (ix = 0; BINFO_BASE_ITERATE (binfo, ix, base_binfo); ++ix)
5556 : {
5557 624 : tree o, basetype = BINFO_TYPE (base_binfo);
5558 :
5559 624 : if (!TYPE_POLYMORPHIC_P (basetype))
5560 48 : continue;
5561 :
5562 576 : o = look_for_overrides_here (basetype, fndecl);
5563 576 : if (o)
5564 : {
5565 411 : if (lookup_attribute ("transaction_safe_dynamic",
5566 411 : DECL_ATTRIBUTES (o)))
5567 : /* transaction_safe_dynamic is not inherited. */;
5568 : else
5569 311 : found |= tm_attr_to_mask (find_tm_attribute
5570 311 : (TYPE_ATTRIBUTES (TREE_TYPE (o))));
5571 : }
5572 : else
5573 165 : found |= look_for_tm_attr_overrides (basetype, fndecl);
5574 : }
5575 :
5576 925 : return found;
5577 : }
5578 :
5579 : /* Subroutine of set_method_tm_attributes. Handle the checks and
5580 : inheritance for one virtual method FNDECL. */
5581 :
5582 : static void
5583 760 : set_one_vmethod_tm_attributes (tree type, tree fndecl)
5584 : {
5585 760 : tree tm_attr;
5586 760 : int found, have;
5587 :
5588 760 : found = look_for_tm_attr_overrides (type, fndecl);
5589 :
5590 : /* If FNDECL doesn't actually override anything (i.e. T is the
5591 : class that first declares FNDECL virtual), then we're done. */
5592 760 : if (found == 0)
5593 : return;
5594 :
5595 45 : tm_attr = find_tm_attribute (TYPE_ATTRIBUTES (TREE_TYPE (fndecl)));
5596 45 : have = tm_attr_to_mask (tm_attr);
5597 :
5598 : /* Intel STM Language Extension 3.0, Section 4.2 table 4:
5599 : tm_pure must match exactly, otherwise no weakening of
5600 : tm_safe > tm_callable > nothing. */
5601 : /* ??? The tm_pure attribute didn't make the transition to the
5602 : multivendor language spec. */
5603 45 : if (have == TM_ATTR_PURE)
5604 : {
5605 0 : if (found != TM_ATTR_PURE)
5606 : {
5607 0 : found &= -found;
5608 0 : goto err_override;
5609 : }
5610 : }
5611 : /* If the overridden function is tm_pure, then FNDECL must be. */
5612 45 : else if (found == TM_ATTR_PURE && tm_attr)
5613 6 : goto err_override;
5614 : /* Look for base class combinations that cannot be satisfied. */
5615 39 : else if (found != TM_ATTR_PURE && (found & TM_ATTR_PURE))
5616 : {
5617 0 : found &= ~TM_ATTR_PURE;
5618 0 : found &= -found;
5619 0 : error_at (DECL_SOURCE_LOCATION (fndecl),
5620 : "method overrides both %<transaction_pure%> and %qE methods",
5621 : tm_mask_to_attr (found));
5622 : }
5623 : /* If FNDECL did not declare an attribute, then inherit the most
5624 : restrictive one. */
5625 39 : else if (tm_attr == NULL)
5626 : {
5627 14 : apply_tm_attr (fndecl, tm_mask_to_attr (least_bit_hwi (found)));
5628 : }
5629 : /* Otherwise validate that we're not weaker than a function
5630 : that is being overridden. */
5631 : else
5632 : {
5633 25 : found &= -found;
5634 25 : if (found <= TM_ATTR_CALLABLE && have > found)
5635 9 : goto err_override;
5636 : }
5637 : return;
5638 :
5639 15 : err_override:
5640 15 : error_at (DECL_SOURCE_LOCATION (fndecl),
5641 : "method declared %qE overriding %qE method",
5642 : tm_attr, tm_mask_to_attr (found));
5643 : }
5644 :
5645 : /* For each of the methods in T, propagate a class-level tm attribute. */
5646 :
5647 : static void
5648 49090220 : set_method_tm_attributes (tree t)
5649 : {
5650 49090220 : tree class_tm_attr, fndecl;
5651 :
5652 : /* Don't bother collecting tm attributes if transactional memory
5653 : support is not enabled. */
5654 49090220 : if (!flag_tm)
5655 : return;
5656 :
5657 : /* Process virtual methods first, as they inherit directly from the
5658 : base virtual function and also require validation of new attributes. */
5659 4788 : if (TYPE_CONTAINS_VPTR_P (t))
5660 : {
5661 200 : tree vchain;
5662 960 : for (vchain = BINFO_VIRTUALS (TYPE_BINFO (t)); vchain;
5663 760 : vchain = TREE_CHAIN (vchain))
5664 : {
5665 760 : fndecl = BV_FN (vchain);
5666 760 : if (DECL_THUNK_P (fndecl))
5667 3 : fndecl = THUNK_TARGET (fndecl);
5668 760 : set_one_vmethod_tm_attributes (t, fndecl);
5669 : }
5670 : }
5671 :
5672 : /* If the class doesn't have an attribute, nothing more to do. */
5673 4788 : class_tm_attr = find_tm_attribute (TYPE_ATTRIBUTES (t));
5674 4788 : if (class_tm_attr == NULL)
5675 : return;
5676 :
5677 : /* Any method that does not yet have a tm attribute inherits
5678 : the one from the class. */
5679 108 : for (fndecl = TYPE_FIELDS (t); fndecl; fndecl = DECL_CHAIN (fndecl))
5680 45 : if (DECL_DECLARES_FUNCTION_P (fndecl)
5681 81 : && !find_tm_attribute (TYPE_ATTRIBUTES (TREE_TYPE (fndecl))))
5682 21 : apply_tm_attr (fndecl, class_tm_attr);
5683 : }
5684 :
5685 : /* Returns true if FN is a default constructor. */
5686 :
5687 : bool
5688 11864396 : default_ctor_p (const_tree fn)
5689 : {
5690 11864396 : return (DECL_CONSTRUCTOR_P (fn)
5691 11864396 : && sufficient_parms_p (FUNCTION_FIRST_USER_PARMTYPE (fn)));
5692 : }
5693 :
5694 : /* Returns true iff class T has a user-provided constructor that can be called
5695 : with more than zero arguments. */
5696 :
5697 : bool
5698 55 : type_has_user_nondefault_constructor (tree t)
5699 : {
5700 55 : if (!TYPE_HAS_USER_CONSTRUCTOR (t))
5701 : return false;
5702 :
5703 65 : for (tree fn : ovl_range (CLASSTYPE_CONSTRUCTORS (t)))
5704 : {
5705 34 : if (user_provided_p (fn)
5706 34 : && (TREE_CODE (fn) == TEMPLATE_DECL
5707 18 : || (skip_artificial_parms_for (fn, DECL_ARGUMENTS (fn))
5708 : != NULL_TREE)))
5709 3 : return true;
5710 : }
5711 :
5712 18 : return false;
5713 : }
5714 :
5715 : /* Returns the defaulted constructor if T has one. Otherwise, returns
5716 : NULL_TREE. */
5717 :
5718 : tree
5719 62 : in_class_defaulted_default_constructor (tree t)
5720 : {
5721 62 : if (!TYPE_HAS_USER_CONSTRUCTOR (t))
5722 : return NULL_TREE;
5723 :
5724 123 : for (ovl_iterator iter (CLASSTYPE_CONSTRUCTORS (t)); iter; ++iter)
5725 : {
5726 78 : tree fn = *iter;
5727 :
5728 156 : if (DECL_DEFAULTED_IN_CLASS_P (fn)
5729 114 : && default_ctor_p (fn))
5730 33 : return fn;
5731 : }
5732 :
5733 0 : return NULL_TREE;
5734 : }
5735 :
5736 : /* Returns true iff FN is a user-provided function, i.e. user-declared
5737 : and not explicitly defaulted or deleted on its first declaration. */
5738 :
5739 : bool
5740 110037458 : user_provided_p (tree fn)
5741 : {
5742 110037458 : fn = STRIP_TEMPLATE (fn);
5743 110037458 : return (!DECL_ARTIFICIAL (fn)
5744 101280401 : && !(DECL_INITIALIZED_IN_CLASS_P (fn)
5745 91554254 : && (DECL_DEFAULTED_FN (fn) || DECL_DELETED_FN (fn)))
5746 : /* At namespace scope,
5747 : void f () = delete;
5748 : is *not* user-provided (and any function deleted after its first
5749 : declaration is ill-formed). */
5750 193774849 : && !(DECL_NAMESPACE_SCOPE_P (fn) && DECL_DELETED_FN (fn)));
5751 : }
5752 :
5753 : /* Returns true iff class T has a user-provided constructor. */
5754 :
5755 : bool
5756 49090358 : type_has_user_provided_constructor (tree t)
5757 : {
5758 49090358 : if (!CLASS_TYPE_P (t))
5759 : return false;
5760 :
5761 49090302 : if (!TYPE_HAS_USER_CONSTRUCTOR (t))
5762 : return false;
5763 :
5764 9465505 : for (ovl_iterator iter (CLASSTYPE_CONSTRUCTORS (t)); iter; ++iter)
5765 7906638 : if (user_provided_p (*iter))
5766 6348253 : return true;
5767 :
5768 412522 : return false;
5769 : }
5770 :
5771 : /* Returns true iff class T has a constructor that accepts a single argument
5772 : and does not have a single parameter of type reference to T.
5773 :
5774 : This does not exclude explicit constructors because they are still
5775 : considered for conversions within { } even though choosing one is
5776 : ill-formed. */
5777 :
5778 : bool
5779 1527644 : type_has_converting_constructor (tree t)
5780 : {
5781 1527644 : if (!CLASS_TYPE_P (t))
5782 : return false;
5783 :
5784 1527644 : if (!TYPE_HAS_USER_CONSTRUCTOR (t))
5785 : return false;
5786 :
5787 4967209 : for (ovl_iterator iter (CLASSTYPE_CONSTRUCTORS (t)); iter; ++iter)
5788 : {
5789 2925526 : tree fn = *iter;
5790 2925526 : tree parm = FUNCTION_FIRST_USER_PARMTYPE (fn);
5791 2925526 : if (parm == NULL_TREE)
5792 : /* Varargs. */
5793 883843 : return true;
5794 3773437 : if (parm == void_list_node
5795 2925524 : || !sufficient_parms_p (TREE_CHAIN (parm)))
5796 : /* Can't accept a single argument, so won't be considered for
5797 : conversion. */
5798 847913 : continue;
5799 2077611 : if (TREE_CODE (fn) == TEMPLATE_DECL
5800 2077611 : || TREE_CHAIN (parm) != void_list_node)
5801 : /* Not a simple single parameter. */
5802 : return true;
5803 1583479 : if (TYPE_MAIN_VARIANT (non_reference (TREE_VALUE (parm)))
5804 1583479 : != DECL_CONTEXT (fn))
5805 : /* The single parameter has the wrong type. */
5806 : return true;
5807 1193770 : if (get_constraints (fn))
5808 : /* Constrained. */
5809 : return true;
5810 : }
5811 :
5812 316087 : return false;
5813 : }
5814 :
5815 : /* Returns true iff class T has a user-provided or explicit constructor. */
5816 :
5817 : bool
5818 49522438 : type_has_user_provided_or_explicit_constructor (tree t)
5819 : {
5820 49522438 : if (!CLASS_TYPE_P (t))
5821 : return false;
5822 :
5823 49522438 : if (!TYPE_HAS_USER_CONSTRUCTOR (t))
5824 : return false;
5825 :
5826 9348945 : for (ovl_iterator iter (CLASSTYPE_CONSTRUCTORS (t)); iter; ++iter)
5827 : {
5828 7931934 : tree fn = *iter;
5829 7931934 : if (user_provided_p (fn) || DECL_NONCONVERTING_P (fn))
5830 6515406 : return true;
5831 : }
5832 :
5833 267016 : return false;
5834 : }
5835 :
5836 : /* Returns true iff class T has a non-user-provided (i.e. implicitly
5837 : declared or explicitly defaulted in the class body) default
5838 : constructor. */
5839 :
5840 : bool
5841 3158382 : type_has_non_user_provided_default_constructor (tree t)
5842 : {
5843 3158382 : if (!TYPE_HAS_DEFAULT_CONSTRUCTOR (t))
5844 : return false;
5845 3158356 : if (CLASSTYPE_LAZY_DEFAULT_CTOR (t))
5846 : return true;
5847 :
5848 22841724 : for (ovl_iterator iter (CLASSTYPE_CONSTRUCTORS (t)); iter; ++iter)
5849 : {
5850 12048120 : tree fn = *iter;
5851 12048120 : if (TREE_CODE (fn) == FUNCTION_DECL
5852 8244187 : && default_ctor_p (fn)
5853 15204287 : && !user_provided_p (fn))
5854 1255702 : return true;
5855 : }
5856 :
5857 1901727 : return false;
5858 : }
5859 :
5860 : /* TYPE is being used as a virtual base, and has a non-trivial move
5861 : assignment. Return true if this is due to there being a user-provided
5862 : move assignment in TYPE or one of its subobjects; if there isn't, then
5863 : multiple move assignment can't cause any harm. */
5864 :
5865 : bool
5866 27 : vbase_has_user_provided_move_assign (tree type)
5867 : {
5868 : /* Does the type itself have a user-provided move assignment operator? */
5869 27 : if (!CLASSTYPE_LAZY_MOVE_ASSIGN (type))
5870 30 : for (ovl_iterator iter (get_class_binding_direct
5871 27 : (type, assign_op_identifier));
5872 57 : iter; ++iter)
5873 48 : if (user_provided_p (*iter) && move_fn_p (*iter))
5874 18 : return true;
5875 :
5876 : /* Do any of its bases? */
5877 9 : tree binfo = TYPE_BINFO (type);
5878 9 : tree base_binfo;
5879 12 : for (int i = 0; BINFO_BASE_ITERATE (binfo, i, base_binfo); ++i)
5880 6 : if (vbase_has_user_provided_move_assign (BINFO_TYPE (base_binfo)))
5881 : return true;
5882 :
5883 : /* Or non-static data members? */
5884 27 : for (tree field = TYPE_FIELDS (type); field; field = DECL_CHAIN (field))
5885 : {
5886 21 : if (TREE_CODE (field) == FIELD_DECL
5887 3 : && CLASS_TYPE_P (TREE_TYPE (field))
5888 21 : && vbase_has_user_provided_move_assign (TREE_TYPE (field)))
5889 : return true;
5890 : }
5891 :
5892 : /* Seems not. */
5893 : return false;
5894 : }
5895 :
5896 : /* If default-initialization leaves part of TYPE uninitialized, returns
5897 : a DECL for the field or TYPE itself (DR 253). */
5898 :
5899 : tree
5900 762775 : default_init_uninitialized_part (tree type)
5901 : {
5902 762775 : tree t, r, binfo;
5903 762775 : int i;
5904 :
5905 762775 : type = strip_array_types (type);
5906 762775 : if (!CLASS_TYPE_P (type))
5907 : return type;
5908 757226 : if (!type_has_non_user_provided_default_constructor (type))
5909 : return NULL_TREE;
5910 703558 : for (binfo = TYPE_BINFO (type), i = 0;
5911 703558 : BINFO_BASE_ITERATE (binfo, i, t); ++i)
5912 : {
5913 136159 : r = default_init_uninitialized_part (BINFO_TYPE (t));
5914 136159 : if (r)
5915 : return r;
5916 : }
5917 704075 : for (t = next_aggregate_field (TYPE_FIELDS (type)); t;
5918 136676 : t = next_aggregate_field (DECL_CHAIN (t)))
5919 136907 : if (!DECL_INITIAL (t) && !DECL_ARTIFICIAL (t))
5920 : {
5921 304 : r = default_init_uninitialized_part (TREE_TYPE (t));
5922 304 : if (r)
5923 449 : return DECL_P (r) ? r : t;
5924 : }
5925 :
5926 : return NULL_TREE;
5927 : }
5928 :
5929 : /* Returns true iff for class T, a trivial synthesized default constructor
5930 : would be constexpr. */
5931 :
5932 : bool
5933 45618197 : trivial_default_constructor_is_constexpr (tree t)
5934 : {
5935 : /* A defaulted trivial default constructor is constexpr
5936 : if there is nothing to initialize. */
5937 45618197 : gcc_assert (!TYPE_HAS_COMPLEX_DFLT (t));
5938 : /* A class with a vptr doesn't have a trivial default ctor.
5939 : In C++20, a class can have transient uninitialized members, e.g.:
5940 :
5941 : struct S { int i; constexpr S() = default; };
5942 :
5943 : should work. */
5944 45618197 : return (cxx_dialect >= cxx20
5945 45618197 : || is_really_empty_class (t, /*ignore_vptr*/true));
5946 : }
5947 :
5948 : /* Returns true iff class T has a constexpr default constructor. */
5949 :
5950 : bool
5951 41876106 : type_has_constexpr_default_constructor (tree t)
5952 : {
5953 41876106 : tree fns;
5954 :
5955 41876106 : if (!CLASS_TYPE_P (t))
5956 : {
5957 : /* The caller should have stripped an enclosing array. */
5958 232 : gcc_assert (TREE_CODE (t) != ARRAY_TYPE);
5959 : return false;
5960 : }
5961 41875874 : if (CLASSTYPE_LAZY_DEFAULT_CTOR (t))
5962 : {
5963 41874388 : if (!TYPE_HAS_COMPLEX_DFLT (t))
5964 41874325 : return trivial_default_constructor_is_constexpr (t);
5965 : /* Non-trivial, we need to check subobject constructors. */
5966 63 : lazily_declare_fn (sfk_constructor, t);
5967 : }
5968 1549 : fns = locate_ctor (t);
5969 1549 : return (fns && DECL_DECLARED_CONSTEXPR_P (fns));
5970 : }
5971 :
5972 : /* Returns true iff class T has a constexpr default constructor or has an
5973 : implicitly declared default constructor that we can't tell if it's constexpr
5974 : without forcing a lazy declaration (which might cause undesired
5975 : instantiations). */
5976 :
5977 : static bool
5978 42299478 : type_maybe_constexpr_default_constructor (tree t)
5979 : {
5980 42299478 : if (CLASS_TYPE_P (t) && CLASSTYPE_LAZY_DEFAULT_CTOR (t)
5981 84598956 : && TYPE_HAS_COMPLEX_DFLT (t))
5982 : /* Assume it's constexpr. */
5983 : return true;
5984 41874325 : return type_has_constexpr_default_constructor (t);
5985 : }
5986 :
5987 : /* Returns true iff class T has a constexpr destructor. */
5988 :
5989 : bool
5990 370 : type_has_constexpr_destructor (tree t)
5991 : {
5992 370 : tree fns;
5993 :
5994 370 : if (CLASSTYPE_LAZY_DESTRUCTOR (t))
5995 : /* Non-trivial, we need to check subobject destructors. */
5996 13 : lazily_declare_fn (sfk_destructor, t);
5997 370 : fns = CLASSTYPE_DESTRUCTOR (t);
5998 370 : return (fns && DECL_DECLARED_CONSTEXPR_P (fns));
5999 : }
6000 :
6001 : /* Returns true iff class T has a constexpr destructor or has an
6002 : implicitly declared destructor that we can't tell if it's constexpr
6003 : without forcing a lazy declaration (which might cause undesired
6004 : instantiations). */
6005 :
6006 : static bool
6007 46841108 : type_maybe_constexpr_destructor (tree t)
6008 : {
6009 : /* Until C++20, only trivial destruction is constexpr. */
6010 46841108 : if (TYPE_HAS_TRIVIAL_DESTRUCTOR (t))
6011 : return true;
6012 1604804 : if (cxx_dialect < cxx20)
6013 : return false;
6014 1581331 : if (CLASS_TYPE_P (t) && CLASSTYPE_LAZY_DESTRUCTOR (t))
6015 : /* Assume it's constexpr. */
6016 : return true;
6017 1339440 : tree fn = CLASSTYPE_DESTRUCTOR (t);
6018 1339440 : return (fn && maybe_constexpr_fn (fn));
6019 : }
6020 :
6021 : /* Returns true iff class TYPE has a virtual destructor. */
6022 :
6023 : bool
6024 3404140 : type_has_virtual_destructor (tree type)
6025 : {
6026 3404140 : tree dtor;
6027 :
6028 3404140 : if (!NON_UNION_CLASS_TYPE_P (type))
6029 : return false;
6030 :
6031 3404008 : gcc_assert (COMPLETE_TYPE_P (type));
6032 3404008 : dtor = CLASSTYPE_DESTRUCTOR (type);
6033 3404008 : return (dtor && DECL_VIRTUAL_P (dtor));
6034 : }
6035 :
6036 : /* True iff class TYPE has a non-deleted trivial default
6037 : constructor. */
6038 :
6039 : bool
6040 19325 : type_has_non_deleted_trivial_default_ctor (tree type)
6041 : {
6042 19325 : return TYPE_HAS_TRIVIAL_DFLT (type) && locate_ctor (type);
6043 : }
6044 :
6045 : /* Returns true iff T, a class, has a move-assignment or
6046 : move-constructor. Does not lazily declare either.
6047 : If USER_P is false, any move function will do. If it is true, the
6048 : move function must be user-declared.
6049 :
6050 : Note that user-declared here is different from "user-provided",
6051 : which doesn't include functions that are defaulted in the
6052 : class. */
6053 :
6054 : bool
6055 51896755 : classtype_has_move_assign_or_move_ctor_p (tree t, bool user_p)
6056 : {
6057 51896755 : gcc_assert (user_p
6058 : || (!CLASSTYPE_LAZY_MOVE_CTOR (t)
6059 : && !CLASSTYPE_LAZY_MOVE_ASSIGN (t)));
6060 :
6061 51896755 : if (!CLASSTYPE_LAZY_MOVE_CTOR (t))
6062 61833324 : for (ovl_iterator iter (CLASSTYPE_CONSTRUCTORS (t)); iter; ++iter)
6063 10389780 : if ((!user_p || !DECL_ARTIFICIAL (*iter)) && move_fn_p (*iter))
6064 1219017 : return true;
6065 :
6066 50677738 : if (!CLASSTYPE_LAZY_MOVE_ASSIGN (t))
6067 1058547 : for (ovl_iterator iter (get_class_binding_direct
6068 45478787 : (t, assign_op_identifier));
6069 46537334 : iter; ++iter)
6070 903918 : if ((!user_p || !DECL_ARTIFICIAL (*iter))
6071 343756 : && DECL_CONTEXT (*iter) == t
6072 1199239 : && move_fn_p (*iter))
6073 1666 : return true;
6074 :
6075 : return false;
6076 : }
6077 :
6078 : /* True iff T has a move constructor that is not deleted. */
6079 :
6080 : bool
6081 6 : classtype_has_non_deleted_move_ctor (tree t)
6082 : {
6083 6 : if (CLASSTYPE_LAZY_MOVE_CTOR (t))
6084 0 : lazily_declare_fn (sfk_move_constructor, t);
6085 6 : for (ovl_iterator iter (CLASSTYPE_CONSTRUCTORS (t)); iter; ++iter)
6086 6 : if (move_fn_p (*iter) && !DECL_DELETED_FN (*iter))
6087 6 : return true;
6088 0 : return false;
6089 : }
6090 :
6091 : /* True iff T has a copy or move constructor that is not deleted. */
6092 :
6093 : bool
6094 99 : classtype_has_non_deleted_copy_or_move_ctor (tree t)
6095 : {
6096 99 : if (CLASSTYPE_LAZY_COPY_CTOR (t))
6097 81 : lazily_declare_fn (sfk_copy_constructor, t);
6098 99 : if (CLASSTYPE_LAZY_MOVE_CTOR (t))
6099 27 : lazily_declare_fn (sfk_move_constructor, t);
6100 132 : for (ovl_iterator iter (CLASSTYPE_CONSTRUCTORS (t)); iter; ++iter)
6101 : {
6102 111 : tree fn = *iter;
6103 111 : if ((copy_fn_p (fn) || move_fn_p (fn)) && !DECL_DELETED_FN (fn))
6104 90 : return true;
6105 : }
6106 9 : return false;
6107 : }
6108 :
6109 : /* If T, a class, has a user-provided copy constructor, copy assignment
6110 : operator, or destructor, returns that function. Otherwise, null. */
6111 :
6112 : tree
6113 6392756 : classtype_has_depr_implicit_copy (tree t)
6114 : {
6115 6392756 : if (!CLASSTYPE_LAZY_COPY_CTOR (t))
6116 17625311 : for (ovl_iterator iter (CLASSTYPE_CONSTRUCTORS (t)); iter; ++iter)
6117 : {
6118 8781189 : tree fn = *iter;
6119 8781189 : if (user_provided_p (fn) && copy_fn_p (fn))
6120 740 : return fn;
6121 : }
6122 :
6123 6392016 : if (!CLASSTYPE_LAZY_COPY_ASSIGN (t))
6124 748224 : for (ovl_iterator iter (get_class_binding_direct
6125 1425090 : (t, assign_op_identifier));
6126 2173314 : iter; ++iter)
6127 : {
6128 748623 : tree fn = *iter;
6129 748623 : if (DECL_CONTEXT (fn) == t
6130 748623 : && user_provided_p (fn) && copy_fn_p (fn))
6131 399 : return fn;
6132 : }
6133 :
6134 6391617 : if (!CLASSTYPE_LAZY_DESTRUCTOR (t))
6135 : {
6136 1946968 : tree fn = CLASSTYPE_DESTRUCTOR (t);
6137 1946968 : if (user_provided_p (fn))
6138 : return fn;
6139 : }
6140 :
6141 : return NULL_TREE;
6142 : }
6143 :
6144 : /* True iff T has a member or friend declaration of operator OP. */
6145 :
6146 : bool
6147 49090220 : classtype_has_op (tree t, tree_code op)
6148 : {
6149 49090220 : tree name = ovl_op_identifier (op);
6150 49090220 : if (get_class_binding (t, name))
6151 : return true;
6152 51010763 : for (tree f = DECL_FRIENDLIST (TYPE_MAIN_DECL (t)); f; f = TREE_CHAIN (f))
6153 3181044 : if (FRIEND_NAME (f) == name)
6154 : return true;
6155 : return false;
6156 : }
6157 :
6158 :
6159 : /* If T has a defaulted member or friend declaration of OP, return it. */
6160 :
6161 : tree
6162 47829719 : classtype_has_defaulted_op (tree t, tree_code op)
6163 : {
6164 47829719 : tree name = ovl_op_identifier (op);
6165 47829773 : for (ovl_iterator oi (get_class_binding (t, name)); oi; ++oi)
6166 : {
6167 642 : tree fn = *oi;
6168 642 : if (DECL_DEFAULTED_FN (fn))
6169 599 : return fn;
6170 : }
6171 48620283 : for (tree f = DECL_FRIENDLIST (TYPE_MAIN_DECL (t)); f; f = TREE_CHAIN (f))
6172 791236 : if (FRIEND_NAME (f) == name)
6173 1838 : for (tree l = FRIEND_DECLS (f); l; l = TREE_CHAIN (l))
6174 : {
6175 1024 : tree fn = TREE_VALUE (l);
6176 1024 : if (DECL_DEFAULTED_FN (fn))
6177 : return fn;
6178 : }
6179 : return NULL_TREE;
6180 : }
6181 :
6182 : /* Nonzero if we need to build up a constructor call when initializing an
6183 : object of this class, either because it has a user-declared constructor
6184 : or because it doesn't have a default constructor (so we need to give an
6185 : error if no initializer is provided). Use TYPE_NEEDS_CONSTRUCTING when
6186 : what you care about is whether or not an object can be produced by a
6187 : constructor (e.g. so we don't set TREE_READONLY on const variables of
6188 : such type); use this function when what you care about is whether or not
6189 : to try to call a constructor to create an object. The latter case is
6190 : the former plus some cases of constructors that cannot be called. */
6191 :
6192 : bool
6193 66283806 : type_build_ctor_call (tree t)
6194 : {
6195 66283806 : tree inner;
6196 66283806 : if (TYPE_NEEDS_CONSTRUCTING (t))
6197 : return true;
6198 59159200 : inner = strip_array_types (t);
6199 59159200 : if (!CLASS_TYPE_P (inner) || ANON_AGGR_TYPE_P (inner))
6200 : return false;
6201 5111299 : if (!TYPE_HAS_DEFAULT_CONSTRUCTOR (inner))
6202 : return true;
6203 4688332 : if (cxx_dialect < cxx11)
6204 : return false;
6205 : /* A user-declared constructor might be private, and a constructor might
6206 : be trivial but deleted. */
6207 18034434 : for (ovl_iterator iter (get_class_binding (inner, complete_ctor_identifier));
6208 18034434 : iter; ++iter)
6209 : {
6210 13810949 : tree fn = *iter;
6211 13810949 : if (!DECL_ARTIFICIAL (fn)
6212 13594896 : || TREE_DEPRECATED (fn)
6213 13481939 : || TREE_UNAVAILABLE (fn)
6214 27292888 : || DECL_DELETED_FN (fn))
6215 456139 : return true;
6216 : }
6217 4223485 : return false;
6218 : }
6219 :
6220 : /* Like type_build_ctor_call, but for destructors. */
6221 :
6222 : bool
6223 124310927 : type_build_dtor_call (tree t)
6224 : {
6225 124310927 : tree inner;
6226 124310927 : if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (t))
6227 : return true;
6228 98425624 : inner = strip_array_types (t);
6229 42534626 : if (!CLASS_TYPE_P (inner) || ANON_AGGR_TYPE_P (inner)
6230 140790651 : || !COMPLETE_TYPE_P (inner))
6231 : return false;
6232 42365004 : if (cxx_dialect < cxx11)
6233 : return false;
6234 : /* A user-declared destructor might be private, and a destructor might
6235 : be trivial but deleted. */
6236 72782069 : for (ovl_iterator iter (get_class_binding (inner, complete_dtor_identifier));
6237 72782069 : iter; ++iter)
6238 : {
6239 41908650 : tree fn = *iter;
6240 41908650 : if (!DECL_ARTIFICIAL (fn)
6241 30453800 : || TREE_DEPRECATED (fn)
6242 30453800 : || TREE_UNAVAILABLE (fn)
6243 72362450 : || DECL_DELETED_FN (fn))
6244 11454853 : return true;
6245 : }
6246 30873419 : return false;
6247 : }
6248 :
6249 : /* Returns TRUE iff we need a cookie when dynamically allocating an
6250 : array whose elements have the indicated class TYPE. */
6251 :
6252 : static bool
6253 49090220 : type_requires_array_cookie (tree type)
6254 : {
6255 49090220 : tree fns;
6256 49090220 : bool has_two_argument_delete_p = false;
6257 :
6258 49090220 : gcc_assert (CLASS_TYPE_P (type));
6259 :
6260 : /* If there's a non-trivial destructor, we need a cookie. In order
6261 : to iterate through the array calling the destructor for each
6262 : element, we'll have to know how many elements there are. */
6263 49090220 : if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type))
6264 : return true;
6265 :
6266 : /* If the usual deallocation function is a two-argument whose second
6267 : argument is of type `size_t', then we have to pass the size of
6268 : the array to the deallocation function, so we will need to store
6269 : a cookie. */
6270 45476370 : fns = lookup_fnfields (TYPE_BINFO (type),
6271 : ovl_op_identifier (false, VEC_DELETE_EXPR),
6272 : /*protect=*/0, tf_warning_or_error);
6273 : /* If there are no `operator []' members, or the lookup is
6274 : ambiguous, then we don't need a cookie. */
6275 45476370 : if (!fns || fns == error_mark_node)
6276 : return false;
6277 : /* Loop through all of the functions. */
6278 239 : for (lkp_iterator iter (BASELINK_FUNCTIONS (fns)); iter; ++iter)
6279 : {
6280 226 : tree fn = *iter;
6281 :
6282 : /* See if this function is a one-argument delete function. If
6283 : it is, then it will be the usual deallocation function. */
6284 226 : tree second_parm = TREE_CHAIN (TYPE_ARG_TYPES (TREE_TYPE (fn)));
6285 226 : if (second_parm == void_list_node)
6286 102 : return false;
6287 : /* Do not consider this function if its second argument is an
6288 : ellipsis. */
6289 124 : if (!second_parm)
6290 3 : continue;
6291 : /* Otherwise, if we have a two-argument function and the second
6292 : argument is `size_t', it will be the usual deallocation
6293 : function -- unless there is one-argument function, too. */
6294 121 : if (TREE_CHAIN (second_parm) == void_list_node
6295 121 : && same_type_p (TREE_VALUE (second_parm), size_type_node))
6296 : has_two_argument_delete_p = true;
6297 : }
6298 :
6299 13 : return has_two_argument_delete_p;
6300 : }
6301 :
6302 : /* Finish computing the `literal type' property of class type T.
6303 :
6304 : At this point, we have already processed base classes and
6305 : non-static data members. We need to check whether the copy
6306 : constructor is trivial, the destructor is trivial, and there
6307 : is a trivial default constructor or at least one constexpr
6308 : constructor other than the copy constructor. */
6309 :
6310 : static void
6311 49090220 : finalize_literal_type_property (tree t)
6312 : {
6313 49090220 : tree fn;
6314 :
6315 49090220 : if (cxx_dialect < cxx11)
6316 114772 : CLASSTYPE_LITERAL_P (t) = false;
6317 48975448 : else if (CLASSTYPE_LITERAL_P (t)
6318 48975448 : && !type_maybe_constexpr_destructor (t))
6319 703073 : CLASSTYPE_LITERAL_P (t) = false;
6320 94003952 : else if (CLASSTYPE_LITERAL_P (t) && LAMBDA_TYPE_P (t))
6321 338626 : CLASSTYPE_LITERAL_P (t) = (cxx_dialect >= cxx17);
6322 93733141 : else if (CLASSTYPE_LITERAL_P (t) && !TYPE_HAS_TRIVIAL_DFLT (t)
6323 3718469 : && CLASSTYPE_NON_AGGREGATE (t)
6324 51489123 : && !TYPE_HAS_CONSTEXPR_CTOR (t))
6325 536797 : CLASSTYPE_LITERAL_P (t) = false;
6326 :
6327 : /* C++14 DR 1684 removed this restriction. */
6328 49090220 : if (cxx_dialect < cxx14
6329 49219354 : && !CLASSTYPE_LITERAL_P (t) && !LAMBDA_TYPE_P (t))
6330 1382700 : for (fn = TYPE_FIELDS (t); fn; fn = DECL_CHAIN (fn))
6331 1246918 : if (TREE_CODE (fn) == FUNCTION_DECL
6332 596859 : && DECL_DECLARED_CONSTEXPR_P (fn)
6333 2707 : && DECL_IOBJ_MEMBER_FUNCTION_P (fn)
6334 1249273 : && !DECL_CONSTRUCTOR_P (fn))
6335 : {
6336 598 : DECL_DECLARED_CONSTEXPR_P (fn) = false;
6337 598 : if (!DECL_GENERATED_P (fn))
6338 : {
6339 7 : auto_diagnostic_group d;
6340 7 : if (pedwarn (DECL_SOURCE_LOCATION (fn), OPT_Wpedantic,
6341 : "enclosing class of %<constexpr%> non-static "
6342 : "member function %q+#D is not a literal type", fn))
6343 5 : explain_non_literal_class (t);
6344 7 : }
6345 : }
6346 49090220 : }
6347 :
6348 : /* T is a non-literal type used in a context which requires a constant
6349 : expression. Explain why it isn't literal. */
6350 :
6351 : void
6352 140 : explain_non_literal_class (tree t)
6353 : {
6354 140 : static hash_set<tree> *diagnosed;
6355 :
6356 140 : if (!CLASS_TYPE_P (t))
6357 52 : return;
6358 137 : t = TYPE_MAIN_VARIANT (t);
6359 :
6360 137 : if (diagnosed == NULL)
6361 74 : diagnosed = new hash_set<tree>;
6362 137 : if (diagnosed->add (t))
6363 : /* Already explained. */
6364 : return;
6365 :
6366 101 : auto_diagnostic_group d;
6367 101 : inform (UNKNOWN_LOCATION, "%q+T is not literal because:", t);
6368 134 : if (cxx_dialect < cxx17 && LAMBDA_TYPE_P (t))
6369 2 : inform (UNKNOWN_LOCATION,
6370 : " %qT is a closure type, which is only literal in "
6371 : "C++17 and later", t);
6372 99 : else if (cxx_dialect < cxx20 && TYPE_HAS_NONTRIVIAL_DESTRUCTOR (t))
6373 5 : inform (UNKNOWN_LOCATION, " %q+T has a non-trivial destructor", t);
6374 94 : else if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (t)
6375 94 : && !type_maybe_constexpr_destructor (t))
6376 17 : inform (UNKNOWN_LOCATION, " %q+T does not have %<constexpr%> destructor",
6377 : t);
6378 77 : else if (CLASSTYPE_NON_AGGREGATE (t)
6379 69 : && !TYPE_HAS_TRIVIAL_DFLT (t)
6380 135 : && !LAMBDA_TYPE_P (t)
6381 146 : && !TYPE_HAS_CONSTEXPR_CTOR (t))
6382 : {
6383 45 : inform (UNKNOWN_LOCATION,
6384 : " %q+T is not an aggregate, does not have a trivial "
6385 : "default constructor, and has no %<constexpr%> constructor that "
6386 : "is not a copy or move constructor", t);
6387 45 : if (type_has_non_user_provided_default_constructor (t))
6388 : /* Note that we can't simply call locate_ctor because when the
6389 : constructor is deleted it just returns NULL_TREE. */
6390 0 : for (ovl_iterator iter (CLASSTYPE_CONSTRUCTORS (t)); iter; ++iter)
6391 : {
6392 0 : tree fn = *iter;
6393 0 : tree parms = TYPE_ARG_TYPES (TREE_TYPE (fn));
6394 :
6395 0 : parms = skip_artificial_parms_for (fn, parms);
6396 :
6397 0 : if (sufficient_parms_p (parms))
6398 : {
6399 0 : if (DECL_DELETED_FN (fn))
6400 0 : maybe_explain_implicit_delete (fn);
6401 : else
6402 0 : explain_invalid_constexpr_fn (fn);
6403 : break;
6404 : }
6405 : }
6406 : }
6407 : else
6408 : {
6409 32 : tree binfo, base_binfo, field; int i;
6410 32 : for (binfo = TYPE_BINFO (t), i = 0;
6411 32 : BINFO_BASE_ITERATE (binfo, i, base_binfo); i++)
6412 : {
6413 13 : tree basetype = TREE_TYPE (base_binfo);
6414 13 : if (!CLASSTYPE_LITERAL_P (basetype))
6415 : {
6416 13 : inform (UNKNOWN_LOCATION,
6417 : " base class %qT of %q+T is non-literal",
6418 : basetype, t);
6419 13 : explain_non_literal_class (basetype);
6420 13 : return;
6421 : }
6422 : }
6423 153 : for (field = TYPE_FIELDS (t); field; field = TREE_CHAIN (field))
6424 : {
6425 134 : tree ftype;
6426 134 : if (TREE_CODE (field) != FIELD_DECL)
6427 115 : continue;
6428 19 : ftype = TREE_TYPE (field);
6429 19 : if (!literal_type_p (ftype))
6430 : {
6431 6 : inform (DECL_SOURCE_LOCATION (field),
6432 : " non-static data member %qD has non-literal type",
6433 : field);
6434 6 : if (CLASS_TYPE_P (ftype))
6435 6 : explain_non_literal_class (ftype);
6436 : }
6437 19 : if (CP_TYPE_VOLATILE_P (ftype))
6438 13 : inform (DECL_SOURCE_LOCATION (field),
6439 : " non-static data member %qD has volatile type", field);
6440 : }
6441 : }
6442 101 : }
6443 :
6444 : /* Check the validity of the bases and members declared in T. Add any
6445 : implicitly-generated functions (like copy-constructors and
6446 : assignment operators). Compute various flag bits (like
6447 : CLASSTYPE_NON_LAYOUT_POD_T) for T. This routine works purely at the C++
6448 : level: i.e., independently of the ABI in use. */
6449 :
6450 : static void
6451 49090220 : check_bases_and_members (tree t)
6452 : {
6453 : /* Nonzero if the implicitly generated copy constructor should take
6454 : a non-const reference argument. */
6455 49090220 : int cant_have_const_ctor;
6456 : /* Nonzero if the implicitly generated assignment operator
6457 : should take a non-const reference argument. */
6458 49090220 : int no_const_asn_ref;
6459 49090220 : tree access_decls;
6460 49090220 : bool saved_complex_asn_ref;
6461 49090220 : bool saved_nontrivial_dtor;
6462 49090220 : tree fn;
6463 :
6464 : /* By default, we use const reference arguments and generate default
6465 : constructors. */
6466 49090220 : cant_have_const_ctor = 0;
6467 49090220 : no_const_asn_ref = 0;
6468 :
6469 : /* Check all the base-classes and set FMEM members to point to arrays
6470 : of potential interest. */
6471 49090220 : check_bases (t, &cant_have_const_ctor, &no_const_asn_ref);
6472 :
6473 : /* Deduce noexcept on destructor. This needs to happen after we've set
6474 : triviality flags appropriately for our bases, and before checking
6475 : overriden virtual functions via check_methods. */
6476 49090220 : if (cxx_dialect >= cxx11)
6477 48975448 : if (tree dtor = CLASSTYPE_DESTRUCTOR (t))
6478 7135888 : for (tree fn : ovl_range (dtor))
6479 3567944 : deduce_noexcept_on_destructor (fn);
6480 :
6481 : /* Check all the method declarations. */
6482 49090220 : check_methods (t);
6483 :
6484 : /* Save the initial values of these flags which only indicate whether
6485 : or not the class has user-provided functions. As we analyze the
6486 : bases and members we can set these flags for other reasons. */
6487 49090220 : saved_complex_asn_ref = TYPE_HAS_COMPLEX_COPY_ASSIGN (t);
6488 49090220 : saved_nontrivial_dtor = TYPE_HAS_NONTRIVIAL_DESTRUCTOR (t);
6489 :
6490 : /* Check all the data member declarations. We cannot call
6491 : check_field_decls until we have called check_bases check_methods,
6492 : as check_field_decls depends on TYPE_HAS_NONTRIVIAL_DESTRUCTOR
6493 : being set appropriately. */
6494 49090220 : check_field_decls (t, &access_decls,
6495 : &cant_have_const_ctor,
6496 : &no_const_asn_ref);
6497 :
6498 : /* A nearly-empty class has to be vptr-containing; a nearly empty
6499 : class contains just a vptr. */
6500 49090220 : if (!TYPE_CONTAINS_VPTR_P (t))
6501 47378627 : CLASSTYPE_NEARLY_EMPTY_P (t) = 0;
6502 :
6503 : /* Do some bookkeeping that will guide the generation of implicitly
6504 : declared member functions. */
6505 50801813 : TYPE_HAS_COMPLEX_COPY_CTOR (t) |= TYPE_CONTAINS_VPTR_P (t);
6506 50801813 : TYPE_HAS_COMPLEX_MOVE_CTOR (t) |= TYPE_CONTAINS_VPTR_P (t);
6507 : /* We need to call a constructor for this class if it has a
6508 : user-provided constructor, or if the default constructor is going
6509 : to initialize the vptr. (This is not an if-and-only-if;
6510 : TYPE_NEEDS_CONSTRUCTING is set elsewhere if bases or members
6511 : themselves need constructing.) */
6512 49090220 : TYPE_NEEDS_CONSTRUCTING (t)
6513 49090220 : |= (type_has_user_provided_constructor (t) || TYPE_CONTAINS_VPTR_P (t));
6514 : /* [dcl.init.aggr]
6515 :
6516 : An aggregate is an array or a class with no user-provided
6517 : constructors ... and no virtual functions.
6518 :
6519 : Again, other conditions for being an aggregate are checked
6520 : elsewhere. */
6521 49090220 : CLASSTYPE_NON_AGGREGATE (t)
6522 49090220 : |= (type_has_user_provided_or_explicit_constructor (t)
6523 49090220 : || TYPE_POLYMORPHIC_P (t));
6524 : /* This is the C++98/03 definition of POD; it changed in C++0x, but we
6525 : retain the old definition internally for ABI reasons. */
6526 49090220 : CLASSTYPE_NON_LAYOUT_POD_P (t)
6527 49090220 : |= (CLASSTYPE_NON_AGGREGATE (t)
6528 49090220 : || saved_nontrivial_dtor || saved_complex_asn_ref);
6529 50801813 : CLASSTYPE_NON_STD_LAYOUT (t) |= TYPE_CONTAINS_VPTR_P (t);
6530 50801813 : TYPE_HAS_COMPLEX_COPY_ASSIGN (t) |= TYPE_CONTAINS_VPTR_P (t);
6531 50801813 : TYPE_HAS_COMPLEX_MOVE_ASSIGN (t) |= TYPE_CONTAINS_VPTR_P (t);
6532 50801813 : TYPE_HAS_COMPLEX_DFLT (t) |= TYPE_CONTAINS_VPTR_P (t);
6533 :
6534 : /* Is this class non-layout-POD because it wasn't an aggregate in C++98? */
6535 49090220 : if (CLASSTYPE_NON_POD_AGGREGATE (t))
6536 : {
6537 823224 : if (CLASSTYPE_NON_LAYOUT_POD_P (t))
6538 : /* It's non-POD for another reason. */
6539 755232 : CLASSTYPE_NON_POD_AGGREGATE (t) = false;
6540 67992 : else if (abi_version_at_least (17))
6541 67990 : CLASSTYPE_NON_LAYOUT_POD_P (t) = true;
6542 : }
6543 :
6544 : /* P1008: Prohibit aggregates with user-declared constructors. */
6545 49090220 : if (cxx_dialect >= cxx20 && TYPE_HAS_USER_CONSTRUCTOR (t))
6546 : {
6547 6657567 : CLASSTYPE_NON_AGGREGATE (t) = true;
6548 6657567 : if (!CLASSTYPE_NON_LAYOUT_POD_P (t))
6549 : {
6550 : /* c++/120012: The C++20 aggregate change affected layout. */
6551 4462 : if (!abi_version_at_least (21))
6552 6 : CLASSTYPE_NON_LAYOUT_POD_P (t) = true;
6553 9412 : if (abi_version_crosses (21))
6554 3974 : CLASSTYPE_NON_AGGREGATE_POD (t) = true;
6555 : }
6556 : }
6557 :
6558 : /* If the only explicitly declared default constructor is user-provided,
6559 : set TYPE_HAS_COMPLEX_DFLT. */
6560 49090220 : if (!TYPE_HAS_COMPLEX_DFLT (t)
6561 44558922 : && TYPE_HAS_DEFAULT_CONSTRUCTOR (t)
6562 51089743 : && !type_has_non_user_provided_default_constructor (t))
6563 1442112 : TYPE_HAS_COMPLEX_DFLT (t) = true;
6564 :
6565 : /* Warn if a public base of a polymorphic type has an accessible
6566 : non-virtual destructor. It is only now that we know the class is
6567 : polymorphic. Although a polymorphic base will have a already
6568 : been diagnosed during its definition, we warn on use too. */
6569 49090220 : if (TYPE_POLYMORPHIC_P (t) && warn_nonvdtor)
6570 : {
6571 84 : tree binfo = TYPE_BINFO (t);
6572 84 : vec<tree, va_gc> *accesses = BINFO_BASE_ACCESSES (binfo);
6573 84 : tree base_binfo;
6574 84 : unsigned i;
6575 :
6576 114 : for (i = 0; BINFO_BASE_ITERATE (binfo, i, base_binfo); i++)
6577 : {
6578 30 : tree basetype = TREE_TYPE (base_binfo);
6579 :
6580 30 : if ((*accesses)[i] == access_public_node
6581 18 : && (TYPE_POLYMORPHIC_P (basetype) || warn_ecpp)
6582 45 : && accessible_nvdtor_p (basetype))
6583 9 : warning (OPT_Wnon_virtual_dtor,
6584 : "base class %q#T has accessible non-virtual destructor",
6585 : basetype);
6586 : }
6587 : }
6588 :
6589 : /* If the class has no user-declared constructor, but does have
6590 : non-static const or reference data members that can never be
6591 : initialized, issue a warning. */
6592 49090220 : if (warn_uninitialized
6593 : /* Classes with user-declared constructors are presumed to
6594 : initialize these members. */
6595 433405 : && !TYPE_HAS_USER_CONSTRUCTOR (t)
6596 : /* Aggregates can be initialized with brace-enclosed
6597 : initializers. */
6598 49455509 : && CLASSTYPE_NON_AGGREGATE (t))
6599 : {
6600 38955 : tree field;
6601 :
6602 243771 : for (field = TYPE_FIELDS (t); field; field = DECL_CHAIN (field))
6603 : {
6604 204816 : tree type;
6605 :
6606 388368 : if (TREE_CODE (field) != FIELD_DECL
6607 204816 : || DECL_INITIAL (field) != NULL_TREE)
6608 183552 : continue;
6609 :
6610 21264 : type = TREE_TYPE (field);
6611 21264 : if (TYPE_REF_P (type))
6612 6 : warning_at (DECL_SOURCE_LOCATION (field),
6613 6 : OPT_Wuninitialized, "non-static reference %q#D "
6614 : "in class without a constructor", field);
6615 21258 : else if (CP_TYPE_CONST_P (type)
6616 21258 : && (!CLASS_TYPE_P (type)
6617 3 : || !TYPE_HAS_DEFAULT_CONSTRUCTOR (type)))
6618 9 : warning_at (DECL_SOURCE_LOCATION (field),
6619 9 : OPT_Wuninitialized, "non-static const member %q#D "
6620 : "in class without a constructor", field);
6621 : }
6622 : }
6623 :
6624 : /* Synthesize any needed methods. */
6625 49090220 : add_implicitly_declared_members (t, &access_decls,
6626 : cant_have_const_ctor,
6627 : no_const_asn_ref);
6628 :
6629 : /* Check defaulted declarations here so we have cant_have_const_ctor
6630 : and don't need to worry about clones. */
6631 318214271 : for (fn = TYPE_FIELDS (t); fn; fn = DECL_CHAIN (fn))
6632 160747912 : if (DECL_DECLARES_FUNCTION_P (fn)
6633 134781261 : && !DECL_ARTIFICIAL (fn)
6634 133754313 : && DECL_DEFAULTED_IN_CLASS_P (fn)
6635 : /* ...except handle comparisons later, in finish_struct_1. */
6636 275331711 : && special_function_p (fn) != sfk_comparison)
6637 : {
6638 6171607 : bool imp_const_p
6639 12343214 : = (DECL_CONSTRUCTOR_P (fn) ? !cant_have_const_ctor
6640 6171607 : : !no_const_asn_ref);
6641 6171685 : defaulted_late_check (fn, imp_const_p);
6642 : }
6643 :
6644 97763454 : if (LAMBDA_TYPE_P (t))
6645 : /* "This class type is not an aggregate." */
6646 338811 : CLASSTYPE_NON_AGGREGATE (t) = 1;
6647 :
6648 : /* Compute the 'literal type' property before we
6649 : do anything with non-static member functions. */
6650 49090220 : finalize_literal_type_property (t);
6651 :
6652 : /* Create the in-charge and not-in-charge variants of constructors
6653 : and destructors. */
6654 49090220 : clone_constructors_and_destructors (t);
6655 :
6656 : /* Process the using-declarations. */
6657 100299879 : for (; access_decls; access_decls = TREE_CHAIN (access_decls))
6658 2119439 : handle_using_decl (TREE_VALUE (access_decls), t);
6659 :
6660 : /* Figure out whether or not we will need a cookie when dynamically
6661 : allocating an array of this type. */
6662 49090220 : LANG_TYPE_CLASS_CHECK (t)->vec_new_uses_cookie
6663 49090220 : = type_requires_array_cookie (t);
6664 :
6665 : /* Classes marked hot or cold propagate the attribute to all members. We
6666 : may do this now that methods are declared. This does miss some lazily
6667 : declared special member functions (CLASSTYPE_LAZY_*), which are handled
6668 : in lazily_declare_fn later on. */
6669 49090220 : propagate_class_warmth_attribute (t);
6670 49090220 : }
6671 :
6672 : /* If T needs a pointer to its virtual function table, set TYPE_VFIELD
6673 : accordingly. If a new vfield was created (because T doesn't have a
6674 : primary base class), then the newly created field is returned. It
6675 : is not added to the TYPE_FIELDS list; it is the caller's
6676 : responsibility to do that. Accumulate declared virtual functions
6677 : on VIRTUALS_P. */
6678 :
6679 : static tree
6680 49090220 : create_vtable_ptr (tree t, tree* virtuals_p)
6681 : {
6682 49090220 : tree fn;
6683 :
6684 : /* Collect the virtual functions declared in T. */
6685 382385350 : for (fn = TYPE_FIELDS (t); fn; fn = DECL_CHAIN (fn))
6686 333295130 : if (TREE_CODE (fn) == FUNCTION_DECL
6687 155151089 : && DECL_VINDEX (fn) && !DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P (fn)
6688 341052475 : && TREE_CODE (DECL_VINDEX (fn)) != INTEGER_CST)
6689 : {
6690 7757345 : tree new_virtual = make_node (TREE_LIST);
6691 :
6692 7757345 : BV_FN (new_virtual) = fn;
6693 7757345 : BV_DELTA (new_virtual) = integer_zero_node;
6694 7757345 : BV_VCALL_INDEX (new_virtual) = NULL_TREE;
6695 :
6696 7757345 : TREE_CHAIN (new_virtual) = *virtuals_p;
6697 7757345 : *virtuals_p = new_virtual;
6698 : }
6699 :
6700 : /* If we couldn't find an appropriate base class, create a new field
6701 : here. Even if there weren't any new virtual functions, we might need a
6702 : new virtual function table if we're supposed to include vptrs in
6703 : all classes that need them. */
6704 49090220 : if (!TYPE_VFIELD (t) && (*virtuals_p || TYPE_CONTAINS_VPTR_P (t)))
6705 : {
6706 : /* We build this decl with vtbl_ptr_type_node, which is a
6707 : `vtable_entry_type*'. It might seem more precise to use
6708 : `vtable_entry_type (*)[N]' where N is the number of virtual
6709 : functions. However, that would require the vtable pointer in
6710 : base classes to have a different type than the vtable pointer
6711 : in derived classes. We could make that happen, but that
6712 : still wouldn't solve all the problems. In particular, the
6713 : type-based alias analysis code would decide that assignments
6714 : to the base class vtable pointer can't alias assignments to
6715 : the derived class vtable pointer, since they have different
6716 : types. Thus, in a derived class destructor, where the base
6717 : class constructor was inlined, we could generate bad code for
6718 : setting up the vtable pointer.
6719 :
6720 : Therefore, we use one type for all vtable pointers. We still
6721 : use a type-correct type; it's just doesn't indicate the array
6722 : bounds. That's better than using `void*' or some such; it's
6723 : cleaner, and it let's the alias analysis code know that these
6724 : stores cannot alias stores to void*! */
6725 244842 : tree field;
6726 :
6727 244842 : field = build_decl (input_location,
6728 : FIELD_DECL, get_vfield_name (t), vtbl_ptr_type_node);
6729 244842 : DECL_VIRTUAL_P (field) = 1;
6730 244842 : DECL_ARTIFICIAL (field) = 1;
6731 244842 : DECL_FIELD_CONTEXT (field) = t;
6732 244842 : DECL_FCONTEXT (field) = t;
6733 244842 : if (TYPE_PACKED (t))
6734 3 : DECL_PACKED (field) = 1;
6735 :
6736 244842 : TYPE_VFIELD (t) = field;
6737 :
6738 : /* This class is non-empty. */
6739 244842 : CLASSTYPE_EMPTY_P (t) = 0;
6740 :
6741 244842 : return field;
6742 : }
6743 :
6744 : return NULL_TREE;
6745 : }
6746 :
6747 : /* Add OFFSET to all base types of BINFO which is a base in the
6748 : hierarchy dominated by T.
6749 :
6750 : OFFSET, which is a type offset, is number of bytes. */
6751 :
6752 : static void
6753 27057139 : propagate_binfo_offsets (tree binfo, tree offset)
6754 : {
6755 27057139 : int i;
6756 27057139 : tree primary_binfo;
6757 27057139 : tree base_binfo;
6758 :
6759 : /* Update BINFO's offset. */
6760 27057139 : BINFO_OFFSET (binfo)
6761 27057139 : = fold_convert (sizetype,
6762 : size_binop (PLUS_EXPR,
6763 : fold_convert (ssizetype, BINFO_OFFSET (binfo)),
6764 : offset));
6765 :
6766 : /* Find the primary base class. */
6767 27057139 : primary_binfo = get_primary_binfo (binfo);
6768 :
6769 28149497 : if (primary_binfo && BINFO_INHERITANCE_CHAIN (primary_binfo) == binfo)
6770 1091358 : propagate_binfo_offsets (primary_binfo, offset);
6771 :
6772 : /* Scan all of the bases, pushing the BINFO_OFFSET adjust
6773 : downwards. */
6774 30832196 : for (i = 0; BINFO_BASE_ITERATE (binfo, i, base_binfo); ++i)
6775 : {
6776 : /* Don't do the primary base twice. */
6777 4867331 : if (base_binfo == primary_binfo)
6778 1092274 : continue;
6779 :
6780 2682783 : if (BINFO_VIRTUAL_P (base_binfo))
6781 212832 : continue;
6782 :
6783 2469951 : propagate_binfo_offsets (base_binfo, offset);
6784 : }
6785 27057139 : }
6786 :
6787 : /* Set BINFO_OFFSET for all of the virtual bases for RLI->T. Update
6788 : TYPE_ALIGN and TYPE_SIZE for T. OFFSETS gives the location of
6789 : empty subobjects of T. */
6790 :
6791 : static void
6792 49090220 : layout_virtual_bases (record_layout_info rli, splay_tree offsets)
6793 : {
6794 49090220 : tree vbase;
6795 49090220 : tree t = rli->t;
6796 49090220 : tree *next_field;
6797 :
6798 49090220 : if (BINFO_N_BASE_BINFOS (TYPE_BINFO (t)) == 0)
6799 : return;
6800 :
6801 : /* Find the last field. The artificial fields created for virtual
6802 : bases will go after the last extant field to date. */
6803 22794176 : next_field = &TYPE_FIELDS (t);
6804 174080980 : while (*next_field)
6805 151286804 : next_field = &DECL_CHAIN (*next_field);
6806 :
6807 : /* Go through the virtual bases, allocating space for each virtual
6808 : base that is not already a primary base class. These are
6809 : allocated in inheritance graph order. */
6810 72636451 : for (vbase = TYPE_BINFO (t); vbase; vbase = TREE_CHAIN (vbase))
6811 : {
6812 49842275 : if (!BINFO_VIRTUAL_P (vbase))
6813 49650255 : continue;
6814 :
6815 192020 : if (!BINFO_PRIMARY_P (vbase))
6816 : {
6817 : /* This virtual base is not a primary base of any class in the
6818 : hierarchy, so we have to add space for it. */
6819 183953 : tree access = access_private_node;
6820 183953 : if (publicly_virtually_derived_p (BINFO_TYPE (vbase), t))
6821 183070 : access = access_public_node;
6822 183953 : next_field = build_base_field (rli, vbase, access, offsets,
6823 : next_field);
6824 : }
6825 : }
6826 : }
6827 :
6828 : /* Returns the offset of the byte just past the end of the base class
6829 : BINFO. */
6830 :
6831 : static tree
6832 46801025 : end_of_base (tree binfo)
6833 : {
6834 46801025 : tree size;
6835 :
6836 46801025 : if (!CLASSTYPE_AS_BASE (BINFO_TYPE (binfo)))
6837 0 : size = TYPE_SIZE_UNIT (char_type_node);
6838 46801025 : else if (is_empty_class (BINFO_TYPE (binfo)))
6839 : /* An empty class has zero CLASSTYPE_SIZE_UNIT, but we need to
6840 : allocate some space for it. It cannot have virtual bases, so
6841 : TYPE_SIZE_UNIT is fine. */
6842 41900348 : size = TYPE_SIZE_UNIT (BINFO_TYPE (binfo));
6843 : else
6844 4900677 : size = CLASSTYPE_SIZE_UNIT (BINFO_TYPE (binfo));
6845 :
6846 46801025 : return size_binop (PLUS_EXPR, BINFO_OFFSET (binfo), size);
6847 : }
6848 :
6849 : /* Returns one of three variations of the ending offset of T. If MODE is
6850 : eoc_nvsize, the result is the ABI "nvsize" (i.e. sizeof before allocating
6851 : vbases). If MODE is eoc_vsize, the result is the sizeof after allocating
6852 : vbases but before rounding, which is not named in the ABI. If MODE is
6853 : eoc_nv_or_dsize, the result is the greater of "nvsize" and "dsize" (the size
6854 : of the actual data in the class, kinda), as used for allocation of
6855 : potentially-overlapping fields. */
6856 :
6857 : enum eoc_mode { eoc_nvsize, eoc_vsize, eoc_nv_or_dsize };
6858 : static tree
6859 96483485 : end_of_class (tree t, eoc_mode mode)
6860 : {
6861 96483485 : tree result = size_zero_node;
6862 96483485 : vec<tree, va_gc> *vbases;
6863 96483485 : tree binfo;
6864 96483485 : tree base_binfo;
6865 96483485 : tree offset;
6866 96483485 : int i;
6867 :
6868 96483485 : for (binfo = TYPE_BINFO (t), i = 0;
6869 143181353 : BINFO_BASE_ITERATE (binfo, i, base_binfo); ++i)
6870 : {
6871 46697868 : if (BINFO_VIRTUAL_P (base_binfo)
6872 46697868 : && (!BINFO_PRIMARY_P (base_binfo)
6873 3390 : || BINFO_INHERITANCE_CHAIN (base_binfo) != TYPE_BINFO (t)))
6874 88863 : continue;
6875 :
6876 46609005 : offset = end_of_base (base_binfo);
6877 46609005 : if (tree_int_cst_lt (result, offset))
6878 46697868 : result = offset;
6879 : }
6880 :
6881 801294069 : for (tree field = TYPE_FIELDS (t); field; field = DECL_CHAIN (field))
6882 704810584 : if (TREE_CODE (field) == FIELD_DECL
6883 704810584 : && !DECL_FIELD_IS_BASE (field))
6884 : {
6885 27788985 : tree size = DECL_SIZE_UNIT (field);
6886 27788985 : if (!size)
6887 : /* DECL_SIZE_UNIT can be null for a flexible array. */
6888 1994 : continue;
6889 :
6890 27786991 : if (is_empty_field (field))
6891 : /* For empty fields DECL_SIZE_UNIT is 0, but we want the
6892 : size of the type (usually 1) for computing nvsize. */
6893 445777 : size = TYPE_SIZE_UNIT (TREE_TYPE (field));
6894 :
6895 27786991 : if (DECL_BIT_FIELD_TYPE (field))
6896 : {
6897 897757 : offset = size_binop (PLUS_EXPR, bit_position (field),
6898 : DECL_SIZE (field));
6899 897757 : offset = size_binop (CEIL_DIV_EXPR, offset, bitsize_unit_node);
6900 897757 : offset = fold_convert (sizetype, offset);
6901 : }
6902 : else
6903 26889234 : offset = size_binop (PLUS_EXPR, byte_position (field), size);
6904 27786991 : if (tree_int_cst_lt (result, offset))
6905 704810584 : result = offset;
6906 : }
6907 :
6908 96483485 : if (mode != eoc_nvsize)
6909 49312439 : for (vbases = CLASSTYPE_VBASECLASSES (t), i = 0;
6910 49312439 : vec_safe_iterate (vbases, i, &base_binfo); i++)
6911 : {
6912 192029 : if (mode == eoc_nv_or_dsize)
6913 : /* For dsize, don't count trailing empty bases. */
6914 9 : offset = size_binop (PLUS_EXPR, BINFO_OFFSET (base_binfo),
6915 : CLASSTYPE_SIZE_UNIT (BINFO_TYPE (base_binfo)));
6916 : else
6917 192020 : offset = end_of_base (base_binfo);
6918 192029 : if (tree_int_cst_lt (result, offset))
6919 181608 : result = offset;
6920 : }
6921 :
6922 96483485 : return result;
6923 : }
6924 :
6925 : /* Warn as appropriate about the change in whether we pack into the tail
6926 : padding of FIELD, a base field which has a C++14 aggregate type with default
6927 : member initializers. */
6928 :
6929 : static void
6930 356768064 : check_non_pod_aggregate (tree field)
6931 : {
6932 1070135655 : if ((!abi_version_crosses (17) || cxx_dialect < cxx14)
6933 731727912 : && (!abi_version_crosses (21) || cxx_dialect < cxx20))
6934 : return;
6935 336499332 : if (TREE_CODE (field) != FIELD_DECL
6936 336499332 : || (!DECL_FIELD_IS_BASE (field)
6937 15352855 : && !field_poverlapping_p (field)))
6938 314163383 : return;
6939 22335949 : tree next = DECL_CHAIN (field);
6940 111713160 : while (next && TREE_CODE (next) != FIELD_DECL) next = DECL_CHAIN (next);
6941 22335949 : if (!next)
6942 : return;
6943 1660330 : tree type = TREE_TYPE (field);
6944 1660330 : if (TYPE_IDENTIFIER (type) == as_base_identifier)
6945 904224 : type = TYPE_CONTEXT (type);
6946 1639895 : if (!CLASS_TYPE_P (type)
6947 1639894 : || is_empty_class (type)
6948 2511368 : || (!CLASSTYPE_NON_POD_AGGREGATE (type)
6949 849504 : && !CLASSTYPE_NON_AGGREGATE_POD (type)))
6950 1658788 : return;
6951 1558 : tree size = end_of_class (type, (DECL_FIELD_IS_BASE (field)
6952 : ? eoc_nvsize : eoc_nv_or_dsize));
6953 1542 : tree rounded = round_up_loc (input_location, size, DECL_ALIGN_UNIT (next));
6954 1542 : if (tree_int_cst_lt (rounded, TYPE_SIZE_UNIT (type)))
6955 : {
6956 30 : location_t loc = DECL_SOURCE_LOCATION (next);
6957 30 : if (DECL_FIELD_IS_BASE (next))
6958 : {
6959 9 : if (abi_version_crosses (17)
6960 6 : && CLASSTYPE_NON_POD_AGGREGATE (type))
6961 6 : warning_at (loc, OPT_Wabi,"offset of %qT base class for "
6962 : "%<-std=c++14%> and up changes in "
6963 6 : "%<-fabi-version=17%> (GCC 12)", TREE_TYPE (next));
6964 0 : else if (abi_version_crosses (21)
6965 0 : && CLASSTYPE_NON_AGGREGATE_POD (type))
6966 0 : warning_at (loc, OPT_Wabi,"offset of %qT base class for "
6967 : "%<-std=c++20%> and up changes in "
6968 0 : "%<-fabi-version=21%> (GCC 16)", TREE_TYPE (next));
6969 : }
6970 : else
6971 : {
6972 45 : if (abi_version_crosses (17)
6973 24 : && CLASSTYPE_NON_POD_AGGREGATE (type))
6974 12 : warning_at (loc, OPT_Wabi, "offset of %qD for "
6975 : "%<-std=c++14%> and up changes in "
6976 : "%<-fabi-version=17%> (GCC 12)", next);
6977 22 : else if (abi_version_crosses (21)
6978 12 : && CLASSTYPE_NON_AGGREGATE_POD (type))
6979 8 : warning_at (loc, OPT_Wabi, "offset of %qD for "
6980 : "%<-std=c++20%> and up changes in "
6981 : "%<-fabi-version=21%> (GCC 16)", next);
6982 : }
6983 : }
6984 : }
6985 :
6986 : /* Warn about bases of T that are inaccessible because they are
6987 : ambiguous. For example:
6988 :
6989 : struct S {};
6990 : struct T : public S {};
6991 : struct U : public S, public T {};
6992 :
6993 : Here, `(S*) new U' is not allowed because there are two `S'
6994 : subobjects of U. */
6995 :
6996 : static void
6997 49090220 : maybe_warn_about_inaccessible_bases (tree t)
6998 : {
6999 49090220 : int i;
7000 49090220 : vec<tree, va_gc> *vbases;
7001 49090220 : tree basetype;
7002 49090220 : tree binfo;
7003 49090220 : tree base_binfo;
7004 :
7005 : /* If not checking for warning then return early. */
7006 49090220 : if (!warn_inaccessible_base)
7007 49090220 : return;
7008 :
7009 : /* If there are no repeated bases, nothing can be ambiguous. */
7010 49090064 : if (!CLASSTYPE_REPEATED_BASE_P (t))
7011 : return;
7012 :
7013 : /* Check direct bases. */
7014 3821 : for (binfo = TYPE_BINFO (t), i = 0;
7015 3821 : BINFO_BASE_ITERATE (binfo, i, base_binfo); ++i)
7016 : {
7017 2764 : basetype = BINFO_TYPE (base_binfo);
7018 :
7019 2764 : if (!uniquely_derived_from_p (basetype, t))
7020 787 : warning (OPT_Winaccessible_base, "direct base %qT inaccessible "
7021 : "in %qT due to ambiguity", basetype, t);
7022 : }
7023 :
7024 : /* Check for ambiguous virtual bases. */
7025 1057 : if (extra_warnings)
7026 6 : for (vbases = CLASSTYPE_VBASECLASSES (t), i = 0;
7027 6 : vec_safe_iterate (vbases, i, &binfo); i++)
7028 : {
7029 3 : basetype = BINFO_TYPE (binfo);
7030 :
7031 3 : if (!uniquely_derived_from_p (basetype, t))
7032 3 : warning (OPT_Winaccessible_base, "virtual base %qT inaccessible in "
7033 : "%qT due to ambiguity", basetype, t);
7034 : }
7035 : }
7036 :
7037 : /* Compare two INTEGER_CSTs K1 and K2. */
7038 :
7039 : static int
7040 9625490 : splay_tree_compare_integer_csts (splay_tree_key k1, splay_tree_key k2)
7041 : {
7042 9625490 : return tree_int_cst_compare ((tree) k1, (tree) k2);
7043 : }
7044 :
7045 : /* Increase the size indicated in RLI to account for empty classes
7046 : that are "off the end" of the class. */
7047 :
7048 : static void
7049 49090220 : include_empty_classes (record_layout_info rli)
7050 : {
7051 49090220 : tree eoc;
7052 49090220 : tree rli_size;
7053 :
7054 : /* It might be the case that we grew the class to allocate a
7055 : zero-sized base class. That won't be reflected in RLI, yet,
7056 : because we are willing to overlay multiple bases at the same
7057 : offset. However, now we need to make sure that RLI is big enough
7058 : to reflect the entire class. */
7059 49090220 : eoc = end_of_class (rli->t, eoc_vsize);
7060 49090220 : rli_size = rli_size_unit_so_far (rli);
7061 49090220 : if (TREE_CODE (rli_size) == INTEGER_CST
7062 49090220 : && tree_int_cst_lt (rli_size, eoc))
7063 : {
7064 : /* The size should have been rounded to a whole byte. */
7065 20221937 : gcc_assert (tree_int_cst_equal
7066 : (rli->bitpos, round_down (rli->bitpos, BITS_PER_UNIT)));
7067 20221937 : rli->bitpos
7068 20221937 : = size_binop (PLUS_EXPR,
7069 : rli->bitpos,
7070 : size_binop (MULT_EXPR,
7071 : fold_convert (bitsizetype,
7072 : size_binop (MINUS_EXPR,
7073 : eoc, rli_size)),
7074 : bitsize_int (BITS_PER_UNIT)));
7075 20221937 : normalize_rli (rli);
7076 : }
7077 49090220 : }
7078 :
7079 : /* Calculate the TYPE_SIZE, TYPE_ALIGN, etc for T. Calculate
7080 : BINFO_OFFSETs for all of the base-classes. Position the vtable
7081 : pointer. Accumulate declared virtual functions on VIRTUALS_P. */
7082 :
7083 : static void
7084 49090220 : layout_class_type (tree t, tree *virtuals_p)
7085 : {
7086 49090220 : tree non_static_data_members;
7087 49090220 : tree field;
7088 49090220 : tree vptr;
7089 49090220 : record_layout_info rli;
7090 : /* Maps offsets (represented as INTEGER_CSTs) to a TREE_LIST of
7091 : types that appear at that offset. */
7092 49090220 : splay_tree empty_base_offsets;
7093 : /* True if the last field laid out was a bit-field. */
7094 49090220 : bool last_field_was_bitfield = false;
7095 : /* The location at which the next field should be inserted. */
7096 49090220 : tree *next_field;
7097 :
7098 : /* Keep track of the first non-static data member. */
7099 49090220 : non_static_data_members = TYPE_FIELDS (t);
7100 :
7101 : /* Start laying out the record. */
7102 49090220 : rli = start_record_layout (t);
7103 :
7104 : /* Mark all the primary bases in the hierarchy. */
7105 49090220 : determine_primary_bases (t);
7106 :
7107 : /* Create a pointer to our virtual function table. */
7108 49090220 : vptr = create_vtable_ptr (t, virtuals_p);
7109 :
7110 : /* The vptr is always the first thing in the class. */
7111 49090220 : if (vptr)
7112 : {
7113 244842 : DECL_CHAIN (vptr) = TYPE_FIELDS (t);
7114 244842 : TYPE_FIELDS (t) = vptr;
7115 244842 : next_field = &DECL_CHAIN (vptr);
7116 244842 : place_field (rli, vptr);
7117 : }
7118 : else
7119 48845378 : next_field = &TYPE_FIELDS (t);
7120 :
7121 : /* Build FIELD_DECLs for all of the non-virtual base-types. */
7122 49090220 : empty_base_offsets = splay_tree_new (splay_tree_compare_integer_csts,
7123 : NULL, NULL);
7124 49090220 : build_base_fields (rli, empty_base_offsets, next_field);
7125 :
7126 : /* Layout the non-static data members. */
7127 382385350 : for (field = non_static_data_members; field; field = DECL_CHAIN (field))
7128 : {
7129 333295130 : tree type;
7130 333295130 : tree padding;
7131 :
7132 : /* We still pass things that aren't non-static data members to
7133 : the back end, in case it wants to do something with them. */
7134 333295130 : if (TREE_CODE (field) != FIELD_DECL)
7135 : {
7136 316432211 : place_field (rli, field);
7137 : /* If the static data member has incomplete type, keep track
7138 : of it so that it can be completed later. (The handling
7139 : of pending statics in finish_record_layout is
7140 : insufficient; consider:
7141 :
7142 : struct S1;
7143 : struct S2 { static S1 s1; };
7144 :
7145 : At this point, finish_record_layout will be called, but
7146 : S1 is still incomplete.) */
7147 316432211 : if (VAR_P (field))
7148 : {
7149 13472273 : maybe_register_incomplete_var (field);
7150 : /* The visibility of static data members is determined
7151 : at their point of declaration, not their point of
7152 : definition. */
7153 13472273 : determine_visibility (field);
7154 : }
7155 316432211 : continue;
7156 : }
7157 :
7158 16862919 : type = TREE_TYPE (field);
7159 16862919 : if (type == error_mark_node)
7160 165 : continue;
7161 :
7162 16862754 : padding = NULL_TREE;
7163 :
7164 16862754 : bool might_overlap = field_poverlapping_p (field);
7165 :
7166 275964 : if (might_overlap && CLASS_TYPE_P (type)
7167 17115673 : && (CLASSTYPE_NON_LAYOUT_POD_P (type) || CLASSTYPE_EMPTY_P (type)))
7168 : {
7169 : /* if D is a potentially-overlapping data member, update sizeof(C) to
7170 : max (sizeof(C), offset(D)+max (nvsize(D), dsize(D))). */
7171 252789 : if (CLASSTYPE_EMPTY_P (type))
7172 222615 : DECL_SIZE (field) = DECL_SIZE_UNIT (field) = size_zero_node;
7173 : else
7174 : {
7175 30174 : tree size = end_of_class (type, eoc_nv_or_dsize);
7176 30174 : DECL_SIZE_UNIT (field) = size;
7177 30174 : DECL_SIZE (field) = bit_from_pos (size, bitsize_zero_node);
7178 : }
7179 : }
7180 :
7181 : /* If this field is a bit-field whose width is greater than its
7182 : type, then there are some special rules for allocating
7183 : it. */
7184 16862754 : if (DECL_C_BIT_FIELD (field)
7185 16862754 : && tree_int_cst_lt (TYPE_SIZE (type), DECL_SIZE (field)))
7186 : {
7187 774 : bool was_unnamed_p = false;
7188 : /* We must allocate the bits as if suitably aligned for the
7189 : longest integer type that fits in this many bits. Then,
7190 : we are supposed to use the left over bits as additional
7191 : padding. */
7192 :
7193 : /* Do not pick a type bigger than MAX_FIXED_MODE_SIZE. */
7194 1548 : tree limit = size_int (MAX_FIXED_MODE_SIZE);
7195 774 : if (tree_int_cst_lt (DECL_SIZE (field), limit))
7196 753 : limit = DECL_SIZE (field);
7197 :
7198 774 : tree integer_type = integer_types[itk_char];
7199 6620 : for (unsigned itk = itk_char; itk != itk_none; itk++)
7200 6599 : if (tree next = integer_types[itk])
7201 : {
7202 6473 : if (tree_int_cst_lt (limit, TYPE_SIZE (next)))
7203 : /* Too big, so our current guess is what we want. */
7204 : break;
7205 : /* Not bigger than limit, ok */
7206 : integer_type = next;
7207 : }
7208 :
7209 : /* Figure out how much additional padding is required. */
7210 774 : if (TREE_CODE (t) == UNION_TYPE)
7211 : /* In a union, the padding field must have the full width
7212 : of the bit-field; all fields start at offset zero. */
7213 77 : padding = DECL_SIZE (field);
7214 : else
7215 697 : padding = size_binop (MINUS_EXPR, DECL_SIZE (field),
7216 : TYPE_SIZE (integer_type));
7217 :
7218 774 : if (integer_zerop (padding))
7219 6 : padding = NULL_TREE;
7220 :
7221 : /* An unnamed bitfield does not normally affect the
7222 : alignment of the containing class on a target where
7223 : PCC_BITFIELD_TYPE_MATTERS. But, the C++ ABI does not
7224 : make any exceptions for unnamed bitfields when the
7225 : bitfields are longer than their types. Therefore, we
7226 : temporarily give the field a name. */
7227 774 : if (PCC_BITFIELD_TYPE_MATTERS && !DECL_NAME (field))
7228 : {
7229 0 : was_unnamed_p = true;
7230 0 : DECL_NAME (field) = make_anon_name ();
7231 : }
7232 :
7233 774 : DECL_SIZE (field) = TYPE_SIZE (integer_type);
7234 774 : SET_DECL_ALIGN (field, TYPE_ALIGN (integer_type));
7235 774 : DECL_USER_ALIGN (field) = TYPE_USER_ALIGN (integer_type);
7236 774 : layout_nonempty_base_or_field (rli, field, NULL_TREE,
7237 : empty_base_offsets);
7238 774 : if (was_unnamed_p)
7239 0 : DECL_NAME (field) = NULL_TREE;
7240 : /* Now that layout has been performed, set the size of the
7241 : field to the size of its declared type; the rest of the
7242 : field is effectively invisible. */
7243 774 : DECL_SIZE (field) = TYPE_SIZE (type);
7244 : /* We must also reset the DECL_MODE of the field. */
7245 774 : SET_DECL_MODE (field, TYPE_MODE (type));
7246 : }
7247 16861980 : else if (might_overlap && is_empty_class (type))
7248 : {
7249 222615 : SET_DECL_FIELD_ABI_IGNORED (field, 1);
7250 222615 : layout_empty_base_or_field (rli, field, empty_base_offsets);
7251 : }
7252 : else
7253 16639365 : layout_nonempty_base_or_field (rli, field, NULL_TREE,
7254 : empty_base_offsets);
7255 :
7256 : /* Remember the location of any empty classes in FIELD. */
7257 16862754 : record_subobject_offsets (field, empty_base_offsets);
7258 :
7259 : /* If a bit-field does not immediately follow another bit-field,
7260 : and yet it starts in the middle of a byte, we have failed to
7261 : comply with the ABI. */
7262 16862754 : if (warn_abi
7263 15281153 : && DECL_C_BIT_FIELD (field)
7264 : /* The TREE_NO_WARNING flag gets set by Objective-C when
7265 : laying out an Objective-C class. The ObjC ABI differs
7266 : from the C++ ABI, and so we do not want a warning
7267 : here. */
7268 583904 : && !warning_suppressed_p (field, OPT_Wabi)
7269 583904 : && !last_field_was_bitfield
7270 16986502 : && !integer_zerop (size_binop (TRUNC_MOD_EXPR,
7271 : DECL_FIELD_BIT_OFFSET (field),
7272 : bitsize_unit_node)))
7273 0 : warning_at (DECL_SOURCE_LOCATION (field), OPT_Wabi,
7274 : "offset of %qD is not ABI-compliant and may "
7275 : "change in a future version of GCC", field);
7276 :
7277 : /* The middle end uses the type of expressions to determine the
7278 : possible range of expression values. In order to optimize
7279 : "x.i > 7" to "false" for a 2-bit bitfield "i", the middle end
7280 : must be made aware of the width of "i", via its type.
7281 :
7282 : Because C++ does not have integer types of arbitrary width,
7283 : we must (for the purposes of the front end) convert from the
7284 : type assigned here to the declared type of the bitfield
7285 : whenever a bitfield expression is used as an rvalue.
7286 : Similarly, when assigning a value to a bitfield, the value
7287 : must be converted to the type given the bitfield here. */
7288 16862754 : if (DECL_C_BIT_FIELD (field))
7289 : {
7290 634395 : unsigned HOST_WIDE_INT width;
7291 634395 : tree ftype = TREE_TYPE (field);
7292 634395 : width = tree_to_uhwi (DECL_SIZE (field));
7293 634395 : if (width != TYPE_PRECISION (ftype))
7294 : {
7295 500016 : TREE_TYPE (field)
7296 1000032 : = c_build_bitfield_integer_type (width,
7297 500016 : TYPE_UNSIGNED (ftype));
7298 500016 : TREE_TYPE (field)
7299 1000032 : = cp_build_qualified_type (TREE_TYPE (field),
7300 : cp_type_quals (ftype));
7301 : }
7302 : }
7303 :
7304 : /* If we needed additional padding after this field, add it
7305 : now. */
7306 16862754 : if (padding)
7307 : {
7308 768 : tree padding_field;
7309 :
7310 768 : padding_field = build_decl (input_location,
7311 : FIELD_DECL,
7312 : NULL_TREE,
7313 : char_type_node);
7314 768 : DECL_BIT_FIELD (padding_field) = 1;
7315 768 : DECL_SIZE (padding_field) = padding;
7316 768 : DECL_CONTEXT (padding_field) = t;
7317 768 : DECL_ARTIFICIAL (padding_field) = 1;
7318 768 : DECL_IGNORED_P (padding_field) = 1;
7319 768 : DECL_PADDING_P (padding_field) = 1;
7320 768 : layout_nonempty_base_or_field (rli, padding_field,
7321 : NULL_TREE,
7322 : empty_base_offsets);
7323 : }
7324 :
7325 16862754 : last_field_was_bitfield = DECL_C_BIT_FIELD (field);
7326 : }
7327 :
7328 49090220 : if (!integer_zerop (rli->bitpos))
7329 : {
7330 : /* Make sure that we are on a byte boundary so that the size of
7331 : the class without virtual bases will always be a round number
7332 : of bytes. */
7333 5246250 : rli->bitpos = round_up_loc (input_location, rli->bitpos, BITS_PER_UNIT);
7334 5246250 : normalize_rli (rli);
7335 : }
7336 :
7337 : /* We used to remove zero width bitfields at this point since PR42217,
7338 : while the C FE never did that. That caused ABI differences on various
7339 : targets. Set the DECL_FIELD_CXX_ZERO_WIDTH_BIT_FIELD flag on them
7340 : instead, so that the backends can emit -Wpsabi warnings in the cases
7341 : where the ABI changed. */
7342 405858284 : for (field = TYPE_FIELDS (t); field; field = DECL_CHAIN (field))
7343 : {
7344 356768064 : if (TREE_CODE (field) == FIELD_DECL
7345 40335853 : && DECL_C_BIT_FIELD (field)
7346 : /* We should not be confused by the fact that grokbitfield
7347 : temporarily sets the width of the bit field into
7348 : DECL_BIT_FIELD_REPRESENTATIVE (field).
7349 : check_bitfield_decl eventually sets DECL_SIZE (field)
7350 : to that width. */
7351 634395 : && (DECL_SIZE (field) == NULL_TREE
7352 634395 : || integer_zerop (DECL_SIZE (field)))
7353 356769233 : && TREE_TYPE (field) != error_mark_node)
7354 1169 : SET_DECL_FIELD_CXX_ZERO_WIDTH_BIT_FIELD (field, 1);
7355 356768064 : check_non_pod_aggregate (field);
7356 : }
7357 :
7358 49090220 : if (CLASSTYPE_NON_LAYOUT_POD_P (t) || CLASSTYPE_EMPTY_P (t))
7359 : {
7360 : /* T needs a different layout as a base (eliding virtual bases
7361 : or whatever). Create that version. */
7362 47361549 : tree base_t = make_node (TREE_CODE (t));
7363 47361549 : tree base_d = create_implicit_typedef (as_base_identifier, base_t);
7364 :
7365 47361549 : TYPE_CONTEXT (base_t) = t;
7366 47361549 : DECL_CONTEXT (base_d) = t;
7367 :
7368 47361549 : set_instantiating_module (base_d);
7369 :
7370 : /* If the ABI version is not at least two, and the last
7371 : field was a bit-field, RLI may not be on a byte
7372 : boundary. In particular, rli_size_unit_so_far might
7373 : indicate the last complete byte, while rli_size_so_far
7374 : indicates the total number of bits used. Therefore,
7375 : rli_size_so_far, rather than rli_size_unit_so_far, is
7376 : used to compute TYPE_SIZE_UNIT. */
7377 :
7378 : /* Set the size and alignment for the new type. */
7379 47361549 : tree eoc = end_of_class (t, eoc_nvsize);
7380 47361549 : TYPE_SIZE_UNIT (base_t)
7381 47361549 : = size_binop (MAX_EXPR,
7382 : fold_convert (sizetype,
7383 : size_binop (CEIL_DIV_EXPR,
7384 : rli_size_so_far (rli),
7385 : bitsize_int (BITS_PER_UNIT))),
7386 : eoc);
7387 47361549 : TYPE_SIZE (base_t)
7388 47361549 : = size_binop (MAX_EXPR,
7389 : rli_size_so_far (rli),
7390 : size_binop (MULT_EXPR,
7391 : fold_convert (bitsizetype, eoc),
7392 : bitsize_int (BITS_PER_UNIT)));
7393 47361549 : SET_TYPE_ALIGN (base_t, rli->record_align);
7394 47361549 : TYPE_USER_ALIGN (base_t) = TYPE_USER_ALIGN (t);
7395 47361549 : TYPE_TYPELESS_STORAGE (base_t) = TYPE_TYPELESS_STORAGE (t);
7396 47361549 : TYPE_CXX_ODR_P (base_t) = TYPE_CXX_ODR_P (t);
7397 :
7398 : /* Copy the non-static data members of T. This will include its
7399 : direct non-virtual bases & vtable. */
7400 47361549 : next_field = &TYPE_FIELDS (base_t);
7401 394514002 : for (field = TYPE_FIELDS (t); field; field = DECL_CHAIN (field))
7402 347152453 : if (TREE_CODE (field) == FIELD_DECL)
7403 : {
7404 33870843 : *next_field = copy_node (field);
7405 : /* Zap any NSDMI, it's not needed and might be a deferred
7406 : parse. */
7407 33870843 : DECL_INITIAL (*next_field) = NULL_TREE;
7408 33870843 : DECL_CONTEXT (*next_field) = base_t;
7409 33870843 : next_field = &DECL_CHAIN (*next_field);
7410 : }
7411 47361549 : *next_field = NULL_TREE;
7412 :
7413 : /* We use the base type for trivial assignments, and hence it
7414 : needs a mode. */
7415 47361549 : compute_record_mode (base_t);
7416 :
7417 : /* Record the base version of the type. */
7418 47361549 : CLASSTYPE_AS_BASE (t) = base_t;
7419 : }
7420 : else
7421 1728671 : CLASSTYPE_AS_BASE (t) = t;
7422 :
7423 : /* Every empty class contains an empty class. */
7424 49090220 : if (CLASSTYPE_EMPTY_P (t))
7425 40905752 : CLASSTYPE_CONTAINS_EMPTY_CLASS_P (t) = 1;
7426 :
7427 : /* Set the TYPE_DECL for this type to contain the right
7428 : value for DECL_OFFSET, so that we can use it as part
7429 : of a COMPONENT_REF for multiple inheritance. */
7430 49090220 : layout_decl (TYPE_MAIN_DECL (t), 0);
7431 :
7432 : /* Now fix up any virtual base class types that we left lying
7433 : around. We must get these done before we try to lay out the
7434 : virtual function table. As a side-effect, this will remove the
7435 : base subobject fields. */
7436 49090220 : layout_virtual_bases (rli, empty_base_offsets);
7437 :
7438 : /* Make sure that empty classes are reflected in RLI at this
7439 : point. */
7440 49090220 : include_empty_classes (rli);
7441 :
7442 : /* Make sure not to create any structures with zero size. */
7443 49090220 : if (integer_zerop (rli_size_unit_so_far (rli)) && CLASSTYPE_EMPTY_P (t))
7444 20684112 : place_field (rli,
7445 : build_decl (input_location,
7446 : FIELD_DECL, NULL_TREE, char_type_node));
7447 :
7448 : /* If this is a non-POD, declaring it packed makes a difference to how it
7449 : can be used as a field; don't let finalize_record_size undo it. */
7450 49090220 : if (TYPE_PACKED (t) && !layout_pod_type_p (t))
7451 81 : rli->packed_maybe_necessary = true;
7452 :
7453 : /* Let the back end lay out the type. */
7454 49090220 : finish_record_layout (rli, /*free_p=*/true);
7455 :
7456 : /* If we didn't end up needing an as-base type, don't use it. */
7457 49090220 : if (CLASSTYPE_AS_BASE (t) != t
7458 : /* If T's CLASSTYPE_AS_BASE is TYPE_USER_ALIGN, but T is not,
7459 : replacing the as-base type would change CLASSTYPE_USER_ALIGN,
7460 : causing us to lose the user-specified alignment as in PR94050. */
7461 47361549 : && TYPE_USER_ALIGN (t) == TYPE_USER_ALIGN (CLASSTYPE_AS_BASE (t))
7462 96451755 : && tree_int_cst_equal (TYPE_SIZE (t),
7463 47361535 : TYPE_SIZE (CLASSTYPE_AS_BASE (t))))
7464 25680596 : CLASSTYPE_AS_BASE (t) = t;
7465 :
7466 49090220 : if (TYPE_SIZE_UNIT (t)
7467 49090220 : && TREE_CODE (TYPE_SIZE_UNIT (t)) == INTEGER_CST
7468 49090220 : && !TREE_OVERFLOW (TYPE_SIZE_UNIT (t))
7469 98180431 : && !valid_constant_size_p (TYPE_SIZE_UNIT (t)))
7470 0 : error ("size of type %qT is too large (%qE bytes)", t, TYPE_SIZE_UNIT (t));
7471 :
7472 : /* Warn about bases that can't be talked about due to ambiguity. */
7473 49090220 : maybe_warn_about_inaccessible_bases (t);
7474 :
7475 : /* Now that we're done with layout, give the base fields the real types. */
7476 406040013 : for (field = TYPE_FIELDS (t); field; field = DECL_CHAIN (field))
7477 356949793 : if (DECL_ARTIFICIAL (field) && IS_FAKE_BASE_TYPE (TREE_TYPE (field)))
7478 20444310 : TREE_TYPE (field) = TYPE_CONTEXT (TREE_TYPE (field));
7479 :
7480 : /* Clean up. */
7481 49090220 : splay_tree_delete (empty_base_offsets);
7482 :
7483 49090220 : if (CLASSTYPE_EMPTY_P (t)
7484 89995972 : && tree_int_cst_lt (sizeof_biggest_empty_class,
7485 40905752 : TYPE_SIZE_UNIT (t)))
7486 60673 : sizeof_biggest_empty_class = TYPE_SIZE_UNIT (t);
7487 49090220 : }
7488 :
7489 : /* Determine the "key method" for the class type indicated by TYPE,
7490 : and set CLASSTYPE_KEY_METHOD accordingly. */
7491 :
7492 : void
7493 1711593 : determine_key_method (tree type)
7494 : {
7495 1711593 : tree method;
7496 :
7497 1711593 : if (processing_template_decl
7498 1711593 : || CLASSTYPE_TEMPLATE_INSTANTIATION (type)
7499 2464578 : || CLASSTYPE_INTERFACE_KNOWN (type))
7500 : return;
7501 :
7502 : /* The key method is the first non-pure virtual function that is not
7503 : inline at the point of class definition. On some targets the
7504 : key function may not be inline; those targets should not call
7505 : this function until the end of the translation unit. */
7506 7643552 : for (method = TYPE_FIELDS (type); method; method = DECL_CHAIN (method))
7507 7454971 : if (TREE_CODE (method) == FUNCTION_DECL
7508 6076417 : && DECL_VINDEX (method) != NULL_TREE
7509 : /* [[gnu::gnu_inline]] virtual inline/constexpr methods will
7510 : have out of line bodies emitted in some other TU and so
7511 : those can be key methods and vtable emitted in the TU with
7512 : the actual out of line definition. */
7513 1240761 : && ! DECL_NONGNU_INLINE_P (method)
7514 8040751 : && ! DECL_PURE_VIRTUAL_P (method))
7515 : {
7516 564375 : SET_CLASSTYPE_KEY_METHOD (type, method);
7517 564375 : break;
7518 : }
7519 :
7520 : return;
7521 : }
7522 :
7523 : /* Helper of find_flexarrays. Return true when FLD refers to a non-static
7524 : class data member of non-zero size, otherwise false. */
7525 :
7526 : static inline bool
7527 40689065 : field_nonempty_p (const_tree fld)
7528 : {
7529 40689065 : if (TREE_CODE (fld) == ERROR_MARK)
7530 : return false;
7531 :
7532 40689065 : tree type = TREE_TYPE (fld);
7533 40689065 : if (TREE_CODE (fld) == FIELD_DECL
7534 40689065 : && TREE_CODE (type) != ERROR_MARK
7535 81378130 : && (DECL_NAME (fld) || RECORD_OR_UNION_TYPE_P (type)))
7536 40559125 : return TYPE_SIZE (type) && !integer_zerop (TYPE_SIZE (type));
7537 :
7538 : return false;
7539 : }
7540 :
7541 : /* Used by find_flexarrays and related functions. */
7542 :
7543 : struct flexmems_t
7544 : {
7545 : /* The first flexible array member or non-zero array member found
7546 : in the order of layout. */
7547 : tree array;
7548 : /* True if there is a non-static non-empty data member in the class or
7549 : its bases. */
7550 : bool first;
7551 : /* The first non-static non-empty data member following either
7552 : the flexible array member, if found, or the zero-length array member
7553 : otherwise. AFTER[1] refers to the first such data member of a union
7554 : of which the struct containing the flexible array member or zero-length
7555 : array is a member, or NULL when no such union exists. This element is
7556 : only used during searching, not for diagnosing problems. AFTER[0]
7557 : refers to the first such data member that is not a member of such
7558 : a union. */
7559 : tree after[2];
7560 :
7561 : /* Refers to a struct (not union) in which the struct of which the flexible
7562 : array is member is defined. Used to diagnose strictly (according to C)
7563 : invalid uses of the latter structs. */
7564 : tree enclosing;
7565 : };
7566 :
7567 : /* Find either the first flexible array member or the first zero-length
7568 : array, in that order of preference, among members of class T (but not
7569 : its base classes), and set members of FMEM accordingly.
7570 : BASE_P is true if T is a base class of another class.
7571 : PUN is true when inside of a union (perhaps recursively).
7572 : PSTR is set to a data member of the outermost struct of
7573 : which the flexible array is a member if one such struct exists,
7574 : otherwise to NULL. NESTED_P is true for recursive calls except ones
7575 : handling anonymous aggregates. Those types are expected to be diagnosed
7576 : on its own already and so only the last member is checked vs. what
7577 : follows it in the outer type. */
7578 :
7579 : static void
7580 82245982 : find_flexarrays (tree t, flexmems_t *fmem, bool base_p,
7581 : bool nested_p /* = false */, bool pun /* = false */,
7582 : tree pstr /* = NULL_TREE */)
7583 : {
7584 82245982 : if (TREE_CODE (t) == UNION_TYPE)
7585 1270879 : pun = true;
7586 :
7587 82245982 : tree fld = TYPE_FIELDS (t);
7588 82245982 : if ((base_p || nested_p) && TREE_CODE (t) == RECORD_TYPE)
7589 : {
7590 : /* In bases or in nested structures, only process the last
7591 : non-static data member. If we have say
7592 : struct A { int a; int b[]; int c; };
7593 : struct B { int d; int e[]; int f; };
7594 : struct C : A { int g; B h, i; int j; };
7595 : then the A::b followed by A::c should have been diagnosed
7596 : already when completing struct A, and B::e followed by B::f
7597 : when completing struct B, so no need to repeat that when completing
7598 : struct C. So, only look at the last member so we cover e.g.
7599 : struct D { int k; int l[]; };
7600 : struct E : D { int m; };
7601 : struct F { D n; int o; };
7602 : where flexible array member at the end of D is fine, but it isn't
7603 : correct that E::m in E or F::o in F follows it. */
7604 : tree last_fld = NULL_TREE;
7605 56193226 : for (; (fld = next_subobject_field (fld)); fld = DECL_CHAIN (fld))
7606 23930247 : if (DECL_ARTIFICIAL (fld))
7607 7220123 : continue;
7608 16710124 : else if (TREE_TYPE (fld) == error_mark_node)
7609 : return;
7610 16710097 : else if (TREE_CODE (TREE_TYPE (fld)) == ARRAY_TYPE
7611 16710097 : || field_nonempty_p (fld))
7612 : last_fld = fld;
7613 : fld = last_fld;
7614 : }
7615 625262899 : for (; fld; fld = DECL_CHAIN (fld))
7616 : {
7617 543017517 : if (fld == error_mark_node)
7618 : return;
7619 :
7620 : /* Is FLD a typedef for an anonymous struct? */
7621 :
7622 : /* FIXME: Note that typedefs (as well as arrays) need to be fully
7623 : handled elsewhere so that errors like the following are detected
7624 : as well:
7625 : typedef struct { int i, a[], j; } S; // bug c++/72753
7626 : S s [2]; // bug c++/68489
7627 : */
7628 543874102 : if (TREE_CODE (fld) == TYPE_DECL
7629 126018871 : && DECL_IMPLICIT_TYPEDEF_P (fld)
7630 7602995 : && CLASS_TYPE_P (TREE_TYPE (fld))
7631 548713041 : && (IDENTIFIER_ANON_P (DECL_NAME (fld))
7632 4838950 : || TYPE_DECL_WAS_UNNAMED (fld)))
7633 : {
7634 : /* Check the nested unnamed type referenced via a typedef
7635 : independently of FMEM (since it's not a data member of
7636 : the enclosing class). */
7637 856585 : check_flexarrays (TREE_TYPE (fld));
7638 856585 : continue;
7639 : }
7640 :
7641 : /* Skip anything that's GCC-generated or not a (non-static) data
7642 : member. */
7643 542160932 : if (DECL_ARTIFICIAL (fld) || TREE_CODE (fld) != FIELD_DECL)
7644 516384563 : continue;
7645 :
7646 : /* Type of the member. */
7647 25776369 : tree fldtype = TREE_TYPE (fld);
7648 25776369 : if (fldtype == error_mark_node)
7649 : return;
7650 :
7651 : /* Determine the type of the array element or object referenced
7652 : by the member so that it can be checked for flexible array
7653 : members if it hasn't been yet. */
7654 : tree eltype = fldtype;
7655 35206317 : while (TREE_CODE (eltype) == ARRAY_TYPE
7656 35206317 : || INDIRECT_TYPE_P (eltype))
7657 9430093 : eltype = TREE_TYPE (eltype);
7658 :
7659 25776224 : if (RECORD_OR_UNION_TYPE_P (eltype))
7660 : {
7661 9767917 : if (fmem->array && !fmem->after[pun])
7662 : {
7663 : /* Once the member after the flexible array has been found
7664 : we're done. */
7665 428 : fmem->after[pun] = fld;
7666 428 : break;
7667 : }
7668 :
7669 13122734 : if (eltype == fldtype || TYPE_UNNAMED_P (eltype))
7670 : {
7671 : /* Descend into the non-static member struct or union and try
7672 : to find a flexible array member or zero-length array among
7673 : its members. This is only necessary for anonymous types
7674 : and types in whose context the current type T has not been
7675 : defined (the latter must not be checked again because they
7676 : are already in the process of being checked by one of the
7677 : recursive calls). */
7678 :
7679 6428851 : bool first = fmem->first;
7680 6428851 : tree array = fmem->array;
7681 13659224 : bool maybe_anon_p = TYPE_UNNAMED_P (eltype);
7682 829050 : if (tree ctx = maybe_anon_p ? TYPE_CONTEXT (eltype) : NULL_TREE)
7683 829050 : maybe_anon_p = RECORD_OR_UNION_TYPE_P (ctx);
7684 :
7685 : /* If this member isn't anonymous and a prior non-flexible array
7686 : member has been seen in one of the enclosing structs, clear
7687 : the FIRST member since it doesn't contribute to the flexible
7688 : array struct's members. */
7689 6428851 : if (first && !array && !ANON_AGGR_TYPE_P (eltype))
7690 1990350 : fmem->first = false;
7691 :
7692 11089464 : find_flexarrays (eltype, fmem, false, !maybe_anon_p, pun,
7693 4660613 : !pstr && TREE_CODE (t) == RECORD_TYPE
7694 : ? fld : pstr);
7695 :
7696 6428851 : if (fmem->array != array)
7697 : {
7698 : /* If the recursive call passed true to nested_p,
7699 : it only looked at the last field and we do not
7700 : want to diagnose in that case the "in otherwise empty"
7701 : case, just if it is followed by some other non-empty
7702 : member. So set fmem->first. */
7703 1039 : if (!maybe_anon_p)
7704 258 : fmem->first = true;
7705 1039 : continue;
7706 : }
7707 :
7708 6427812 : if (first && !array && !ANON_AGGR_TYPE_P (eltype))
7709 : /* Restore the FIRST member reset above if no flexible
7710 : array member has been found in this member's struct. */
7711 1989968 : fmem->first = first;
7712 :
7713 : /* If the member struct contains the first flexible array
7714 : member, or if this member is a base class, continue to
7715 : the next member and avoid setting the FMEM->AFTER pointer
7716 : to point to it. */
7717 6427812 : if (base_p)
7718 1135199 : continue;
7719 : }
7720 : }
7721 :
7722 24639558 : if (field_nonempty_p (fld))
7723 : {
7724 : /* Remember the first non-static data member. */
7725 24505243 : if (!fmem->first)
7726 9513917 : fmem->first = true;
7727 :
7728 : /* Remember the first non-static data member after the flexible
7729 : array member, if one has been found, or the zero-length array
7730 : if it has been found. */
7731 24505243 : if (fmem->array && !fmem->after[pun])
7732 1508 : fmem->after[pun] = fld;
7733 : }
7734 :
7735 : /* Skip non-arrays. */
7736 24639558 : if (TREE_CODE (fldtype) != ARRAY_TYPE)
7737 22724509 : continue;
7738 :
7739 : /* Determine the upper bound of the array if it has one. */
7740 1915049 : if (TYPE_DOMAIN (fldtype))
7741 : {
7742 1913427 : if (fmem->array)
7743 : {
7744 : /* Make a record of the zero-length array if either one
7745 : such field or a flexible array member has been seen to
7746 : handle the pathological and unlikely case of multiple
7747 : such members. */
7748 1040 : if (!fmem->after[pun])
7749 83 : fmem->after[pun] = fld;
7750 : }
7751 1912387 : else if (integer_all_onesp (TYPE_MAX_VALUE (TYPE_DOMAIN (fldtype))))
7752 : {
7753 : /* Remember the first zero-length array unless a flexible array
7754 : member has already been seen. */
7755 2446 : fmem->array = fld;
7756 2446 : fmem->enclosing = pstr;
7757 : }
7758 : }
7759 : else
7760 : {
7761 : /* Flexible array members have no upper bound. */
7762 1622 : if (fmem->array)
7763 : {
7764 79 : if (TYPE_DOMAIN (TREE_TYPE (fmem->array)))
7765 : {
7766 : /* Replace the zero-length array if it's been stored and
7767 : reset the after pointer. */
7768 31 : fmem->after[pun] = NULL_TREE;
7769 31 : fmem->array = fld;
7770 31 : fmem->enclosing = pstr;
7771 : }
7772 48 : else if (!fmem->after[pun])
7773 : /* Make a record of another flexible array member. */
7774 39 : fmem->after[pun] = fld;
7775 : }
7776 : else
7777 : {
7778 1543 : fmem->array = fld;
7779 1543 : fmem->enclosing = pstr;
7780 : }
7781 : }
7782 : }
7783 : }
7784 :
7785 : /* Diagnose a strictly (by the C standard) invalid use of a struct with
7786 : a flexible array member (or the zero-length array extension). */
7787 :
7788 : static void
7789 2140 : diagnose_invalid_flexarray (const flexmems_t *fmem)
7790 : {
7791 2140 : if (fmem->array && fmem->enclosing)
7792 : {
7793 655 : auto_diagnostic_group d;
7794 655 : if (pedwarn (location_of (fmem->enclosing), OPT_Wpedantic,
7795 655 : TYPE_DOMAIN (TREE_TYPE (fmem->array))
7796 : ? G_("invalid use of %q#T with a zero-size array in %q#D")
7797 : : G_("invalid use of %q#T with a flexible array member "
7798 : "in %q#T"),
7799 655 : DECL_CONTEXT (fmem->array),
7800 655 : DECL_CONTEXT (fmem->enclosing)))
7801 78 : inform (DECL_SOURCE_LOCATION (fmem->array),
7802 78 : "array member %q#D declared here", fmem->array);
7803 655 : }
7804 2140 : }
7805 :
7806 : /* Issue diagnostics for invalid flexible array members or zero-length
7807 : arrays that are not the last elements of the containing class or its
7808 : base classes or that are its sole members. */
7809 :
7810 : static void
7811 48757063 : diagnose_flexarrays (tree t, const flexmems_t *fmem)
7812 : {
7813 48757063 : if (!fmem->array)
7814 : return;
7815 :
7816 3989 : if (fmem->first && !fmem->after[0])
7817 : {
7818 1858 : diagnose_invalid_flexarray (fmem);
7819 1858 : return;
7820 : }
7821 :
7822 : /* Has a diagnostic been issued? */
7823 2131 : bool diagd = false;
7824 :
7825 2131 : const char *msg = 0;
7826 2131 : const char *msg_fam = 0;
7827 :
7828 2131 : if (TYPE_DOMAIN (TREE_TYPE (fmem->array)))
7829 : {
7830 1615 : if (fmem->after[0])
7831 : msg = G_("zero-size array member %qD not at end of %q#T");
7832 256 : else if (!fmem->first)
7833 : msg = G_("zero-size array member %qD in an otherwise empty %q#T");
7834 :
7835 : if (msg)
7836 : {
7837 1615 : location_t loc = DECL_SOURCE_LOCATION (fmem->array);
7838 :
7839 1615 : auto_diagnostic_group d;
7840 1615 : if (pedwarn (loc, OPT_Wpedantic, msg, fmem->array, t))
7841 : {
7842 138 : inform (location_of (t), "in the definition of %q#T", t);
7843 138 : diagd = true;
7844 : }
7845 1615 : }
7846 : }
7847 : else
7848 : {
7849 516 : if (fmem->after[0])
7850 : msg = G_("flexible array member %qD not at end of %q#T");
7851 318 : else if (!fmem->first)
7852 318 : msg_fam = G_("flexible array member %qD in an otherwise"
7853 : " empty %q#T is a GCC extension");
7854 :
7855 516 : if (msg || msg_fam)
7856 : {
7857 516 : location_t loc = DECL_SOURCE_LOCATION (fmem->array);
7858 516 : diagd = true;
7859 :
7860 516 : auto_diagnostic_group d;
7861 516 : if (msg)
7862 198 : error_at (loc, msg, fmem->array, t);
7863 : else
7864 318 : pedwarn (loc, OPT_Wpedantic, msg_fam, fmem->array, t);
7865 :
7866 : /* In the unlikely event that the member following the flexible
7867 : array member is declared in a different class, or the member
7868 : overlaps another member of a common union, point to it.
7869 : Otherwise it should be obvious. */
7870 516 : if (fmem->after[0]
7871 516 : && (DECL_CONTEXT (fmem->after[0])
7872 198 : != DECL_CONTEXT (fmem->array)))
7873 : {
7874 78 : inform (DECL_SOURCE_LOCATION (fmem->after[0]),
7875 : "next member %q#D declared here",
7876 : fmem->after[0]);
7877 78 : inform (location_of (t), "in the definition of %q#T", t);
7878 : }
7879 516 : }
7880 : }
7881 :
7882 2131 : if (!diagd && fmem->array && fmem->enclosing)
7883 282 : diagnose_invalid_flexarray (fmem);
7884 : }
7885 :
7886 :
7887 : /* Recursively check to make sure that any flexible array or zero-length
7888 : array members of class T or its bases are valid (i.e., not the sole
7889 : non-static data member of T and, if one exists, that it is the last
7890 : non-static data member of T and its base classes. FMEM is expected
7891 : to be initially null and is used internally by recursive calls to
7892 : the function. Issue the appropriate diagnostics for the array member
7893 : that fails the checks. */
7894 :
7895 : static void
7896 77006873 : check_flexarrays (tree t, flexmems_t *fmem /* = NULL */,
7897 : bool base_p /* = false */)
7898 : {
7899 : /* Initialize the result of a search for flexible array and zero-length
7900 : array members. Avoid doing any work if the most interesting FMEM data
7901 : have already been populated. */
7902 77006873 : flexmems_t flexmems = flexmems_t ();
7903 77006873 : if (!fmem)
7904 : fmem = &flexmems;
7905 27060068 : else if (fmem->array && fmem->first && fmem->after[0])
7906 0 : return;
7907 :
7908 77006873 : tree fam = fmem->array;
7909 :
7910 : /* Recursively check the primary base class first. */
7911 77006873 : if (CLASSTYPE_HAS_PRIMARY_BASE_P (t))
7912 : {
7913 2559489 : tree basetype = BINFO_TYPE (CLASSTYPE_PRIMARY_BINFO (t));
7914 2559489 : check_flexarrays (basetype, fmem, true);
7915 : }
7916 :
7917 : /* Recursively check the base classes. */
7918 77006873 : int nbases = TYPE_BINFO (t) ? BINFO_N_BASE_BINFOS (TYPE_BINFO (t)) : 0;
7919 104132307 : for (int i = 0; i < nbases; ++i)
7920 : {
7921 27125434 : tree base_binfo = BINFO_BASE_BINFO (TYPE_BINFO (t), i);
7922 :
7923 : /* The primary base class was already checked above. */
7924 27125434 : if (base_binfo == CLASSTYPE_PRIMARY_BINFO (t))
7925 2559334 : continue;
7926 :
7927 : /* Virtual base classes are at the end. */
7928 24566100 : if (BINFO_VIRTUAL_P (base_binfo))
7929 257544 : continue;
7930 :
7931 : /* Check the base class. */
7932 24308556 : check_flexarrays (BINFO_TYPE (base_binfo), fmem, /*base_p=*/true);
7933 : }
7934 :
7935 77006873 : if (fmem == &flexmems)
7936 : {
7937 : /* Check virtual base classes only once per derived class.
7938 : I.e., this check is not performed recursively for base
7939 : classes. */
7940 49946805 : int i;
7941 49946805 : tree base_binfo;
7942 49946805 : vec<tree, va_gc> *vbases;
7943 50138828 : for (vbases = CLASSTYPE_VBASECLASSES (t), i = 0;
7944 50138828 : vec_safe_iterate (vbases, i, &base_binfo); i++)
7945 : {
7946 : /* Check the virtual base class. */
7947 192023 : tree basetype = TREE_TYPE (base_binfo);
7948 :
7949 192023 : check_flexarrays (basetype, fmem, /*base_p=*/true);
7950 : }
7951 : }
7952 :
7953 : /* Is the type unnamed (and therefore a member of it potentially
7954 : an anonymous struct or union)? */
7955 155932612 : bool maybe_anon_p = TYPE_UNNAMED_P (t);
7956 1573113 : if (tree ctx = maybe_anon_p ? TYPE_CONTEXT (t) : NULL_TREE)
7957 1573113 : maybe_anon_p = RECORD_OR_UNION_TYPE_P (ctx);
7958 :
7959 : /* Search the members of the current (possibly derived) class, skipping
7960 : unnamed structs and unions since those could be anonymous. */
7961 77006873 : if (fmem != &flexmems || !maybe_anon_p)
7962 102877377 : find_flexarrays (t, fmem, base_p || fam != fmem->array);
7963 :
7964 77006873 : if (fmem == &flexmems && !maybe_anon_p)
7965 : /* Issue diagnostics for invalid flexible and zero-length array
7966 : members found in base classes or among the members of the current
7967 : class. Ignore anonymous structs and unions whose members are
7968 : considered to be members of the enclosing class and thus will
7969 : be diagnosed when checking it. */
7970 48757063 : diagnose_flexarrays (t, fmem);
7971 : }
7972 :
7973 : /* Perform processing required when the definition of T (a class type)
7974 : is complete. Diagnose invalid definitions of flexible array members
7975 : and zero-size arrays. */
7976 :
7977 : void
7978 49090220 : finish_struct_1 (tree t)
7979 : {
7980 49090220 : tree x;
7981 : /* A TREE_LIST. The TREE_VALUE of each node is a FUNCTION_DECL. */
7982 49090220 : tree virtuals = NULL_TREE;
7983 :
7984 49090220 : if (COMPLETE_TYPE_P (t))
7985 : {
7986 0 : gcc_assert (MAYBE_CLASS_TYPE_P (t));
7987 0 : error ("redefinition of %q#T", t);
7988 0 : popclass ();
7989 0 : return;
7990 : }
7991 :
7992 49090220 : if (location_t fcloc = failed_completion_location (t))
7993 : {
7994 11 : auto_diagnostic_group adg;
7995 11 : if (warning (OPT_Wsfinae_incomplete_,
7996 : "defining %qT, which previously failed to be complete "
7997 : "in a SFINAE context", t)
7998 11 : && warn_sfinae_incomplete == 1)
7999 11 : inform (fcloc, "here. Use %qs for a diagnostic at that point",
8000 : "-Wsfinae-incomplete=2");
8001 11 : }
8002 :
8003 : /* If this type was previously laid out as a forward reference,
8004 : make sure we lay it out again. */
8005 49090220 : TYPE_SIZE (t) = NULL_TREE;
8006 49090220 : CLASSTYPE_PRIMARY_BINFO (t) = NULL_TREE;
8007 :
8008 : /* Make assumptions about the class; we'll reset the flags if
8009 : necessary. */
8010 49090220 : CLASSTYPE_EMPTY_P (t) = 1;
8011 49090220 : CLASSTYPE_NEARLY_EMPTY_P (t) = 1;
8012 49090220 : CLASSTYPE_CONTAINS_EMPTY_CLASS_P (t) = 0;
8013 49090220 : CLASSTYPE_LITERAL_P (t) = true;
8014 :
8015 : /* Do end-of-class semantic processing: checking the validity of the
8016 : bases and members and add implicitly generated methods. */
8017 49090220 : check_bases_and_members (t);
8018 :
8019 : /* Find the key method. */
8020 49090220 : if (TYPE_CONTAINS_VPTR_P (t))
8021 : {
8022 : /* The Itanium C++ ABI permits the key method to be chosen when
8023 : the class is defined -- even though the key method so
8024 : selected may later turn out to be an inline function. On
8025 : some systems (such as ARM Symbian OS) the key method cannot
8026 : be determined until the end of the translation unit. On such
8027 : systems, we leave CLASSTYPE_KEY_METHOD set to NULL, which
8028 : will cause the class to be added to KEYED_CLASSES. Then, in
8029 : finish_file we will determine the key method. */
8030 1711593 : if (targetm.cxx.key_method_may_be_inline ())
8031 1711593 : determine_key_method (t);
8032 :
8033 : /* If a polymorphic class has no key method, we may emit the vtable
8034 : in every translation unit where the class definition appears. If
8035 : we're devirtualizing, we can look into the vtable even if we
8036 : aren't emitting it.
8037 :
8038 : Additionally, if the class is attached to a named module, make sure
8039 : to always emit the vtable in this TU. */
8040 1711593 : if (!CLASSTYPE_KEY_METHOD (t) || module_attach_p ())
8041 1147263 : vec_safe_push (keyed_classes, t);
8042 : }
8043 :
8044 : /* Layout the class itself. */
8045 49090220 : layout_class_type (t, &virtuals);
8046 : /* COMPLETE_TYPE_P is now true. */
8047 :
8048 49090220 : set_class_bindings (t);
8049 :
8050 : /* With the layout complete, check for flexible array members and
8051 : zero-length arrays that might overlap other members in the final
8052 : layout. */
8053 49090220 : check_flexarrays (t);
8054 :
8055 49090220 : virtuals = modify_all_vtables (t, nreverse (virtuals));
8056 :
8057 : /* If necessary, create the primary vtable for this class. */
8058 49090220 : if (virtuals || TYPE_CONTAINS_VPTR_P (t))
8059 : {
8060 : /* We must enter these virtuals into the table. */
8061 1711593 : if (!CLASSTYPE_HAS_PRIMARY_BASE_P (t))
8062 244842 : build_primary_vtable (NULL_TREE, t);
8063 1466751 : else if (! BINFO_NEW_VTABLE_MARKED (TYPE_BINFO (t)))
8064 : /* Here we know enough to change the type of our virtual
8065 : function table, but we will wait until later this function. */
8066 0 : build_primary_vtable (CLASSTYPE_PRIMARY_BINFO (t), t);
8067 :
8068 : /* If we're warning about ABI tags, check the types of the new
8069 : virtual functions. */
8070 1711593 : if (warn_abi_tag)
8071 6 : for (tree v = virtuals; v; v = TREE_CHAIN (v))
8072 3 : check_abi_tags (t, TREE_VALUE (v));
8073 : }
8074 :
8075 49090220 : if (TYPE_CONTAINS_VPTR_P (t))
8076 : {
8077 1711593 : int vindex;
8078 1711593 : tree fn;
8079 :
8080 1711593 : if (BINFO_VTABLE (TYPE_BINFO (t)))
8081 1711593 : gcc_assert (DECL_VIRTUAL_P (BINFO_VTABLE (TYPE_BINFO (t))));
8082 1711593 : if (!CLASSTYPE_HAS_PRIMARY_BASE_P (t))
8083 244842 : gcc_assert (BINFO_VIRTUALS (TYPE_BINFO (t)) == NULL_TREE);
8084 :
8085 : /* Add entries for virtual functions introduced by this class. */
8086 1711593 : BINFO_VIRTUALS (TYPE_BINFO (t))
8087 1711593 : = chainon (BINFO_VIRTUALS (TYPE_BINFO (t)), virtuals);
8088 :
8089 : /* Set DECL_VINDEX for all functions declared in this class. */
8090 1711593 : for (vindex = 0, fn = BINFO_VIRTUALS (TYPE_BINFO (t));
8091 11562654 : fn;
8092 9851061 : fn = TREE_CHAIN (fn),
8093 9851061 : vindex += (TARGET_VTABLE_USES_DESCRIPTORS
8094 : ? TARGET_VTABLE_USES_DESCRIPTORS : 1))
8095 : {
8096 9851061 : tree fndecl = BV_FN (fn);
8097 :
8098 9851061 : if (DECL_THUNK_P (fndecl))
8099 : /* A thunk. We should never be calling this entry directly
8100 : from this vtable -- we'd use the entry for the non
8101 : thunk base function. */
8102 126 : DECL_VINDEX (fndecl) = NULL_TREE;
8103 9850935 : else if (TREE_CODE (DECL_VINDEX (fndecl)) != INTEGER_CST)
8104 7757345 : DECL_VINDEX (fndecl) = build_int_cst (NULL_TREE, vindex);
8105 : }
8106 : }
8107 :
8108 49090220 : validate_trivial_abi_attribute (t);
8109 :
8110 49090220 : finish_struct_bits (t);
8111 :
8112 49090220 : set_method_tm_attributes (t);
8113 49090220 : if (flag_openmp || flag_openmp_simd)
8114 117787 : finish_omp_declare_simd_methods (t);
8115 :
8116 : /* Clear DECL_IN_AGGR_P for all member functions. Complete the rtl
8117 : for any static member objects of the type we're working on. */
8118 406040337 : for (x = TYPE_FIELDS (t); x; x = DECL_CHAIN (x))
8119 356950117 : if (DECL_DECLARES_FUNCTION_P (x))
8120 : {
8121 : /* Synthesize constexpr defaulted comparisons. */
8122 198770689 : if (!DECL_ARTIFICIAL (x)
8123 197743363 : && DECL_DEFAULTED_IN_CLASS_P (x)
8124 214134031 : && special_function_p (x) == sfk_comparison)
8125 36053 : defaulted_late_check (x);
8126 198770689 : DECL_IN_AGGR_P (x) = false;
8127 : }
8128 13472273 : else if (VAR_P (x) && TREE_STATIC (x)
8129 13472273 : && TREE_TYPE (x) != error_mark_node
8130 171651636 : && same_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (x)), t))
8131 140904 : SET_DECL_MODE (x, TYPE_MODE (t));
8132 :
8133 : /* Complain if one of the field types requires lower visibility. */
8134 49090220 : constrain_class_visibility (t);
8135 :
8136 : /* Make the rtl for any new vtables we have created, and unmark
8137 : the base types we marked. */
8138 49090220 : finish_vtbls (t);
8139 :
8140 : /* Build the VTT for T. */
8141 49090220 : build_vtt (t);
8142 :
8143 49090220 : if (warn_nonvdtor
8144 147 : && TYPE_POLYMORPHIC_P (t) && accessible_nvdtor_p (t)
8145 49090256 : && !CLASSTYPE_FINAL (t))
8146 33 : warning (OPT_Wnon_virtual_dtor,
8147 : "%q#T has virtual functions and accessible"
8148 : " non-virtual destructor", t);
8149 :
8150 49090220 : complete_vars (t);
8151 :
8152 49090220 : if (warn_overloaded_virtual)
8153 423911 : warn_hidden (t);
8154 :
8155 : /* Class layout, assignment of virtual table slots, etc., is now
8156 : complete. Give the back end a chance to tweak the visibility of
8157 : the class or perform any other required target modifications. */
8158 49090220 : targetm.cxx.adjust_class_at_definition (t);
8159 :
8160 49090220 : maybe_suppress_debug_info (t);
8161 :
8162 49090220 : if (flag_vtable_verify)
8163 12 : vtv_save_class_info (t);
8164 :
8165 49090220 : dump_class_hierarchy (t);
8166 :
8167 : /* Finish debugging output for this type. */
8168 49090220 : rest_of_type_compilation (t, ! LOCAL_CLASS_P (t));
8169 :
8170 49090220 : if (TYPE_TRANSPARENT_AGGR (t))
8171 : {
8172 163 : tree field = first_field (t);
8173 163 : if (field == NULL_TREE || error_operand_p (field))
8174 : {
8175 9 : error ("type transparent %q#T does not have any fields", t);
8176 9 : TYPE_TRANSPARENT_AGGR (t) = 0;
8177 : }
8178 154 : else if (DECL_ARTIFICIAL (field))
8179 : {
8180 3 : if (DECL_FIELD_IS_BASE (field))
8181 3 : error ("type transparent class %qT has base classes", t);
8182 : else
8183 : {
8184 0 : gcc_checking_assert (DECL_VIRTUAL_P (field));
8185 0 : error ("type transparent class %qT has virtual functions", t);
8186 : }
8187 3 : TYPE_TRANSPARENT_AGGR (t) = 0;
8188 : }
8189 151 : else if (TYPE_MODE (t) != DECL_MODE (field))
8190 : {
8191 3 : error ("type transparent %q#T cannot be made transparent because "
8192 : "the type of the first field has a different ABI from the "
8193 : "class overall", t);
8194 3 : TYPE_TRANSPARENT_AGGR (t) = 0;
8195 : }
8196 : }
8197 : }
8198 :
8199 : /* When T was built up, the member declarations were added in reverse
8200 : order. Rearrange them to declaration order. */
8201 :
8202 : void
8203 67782000 : unreverse_member_declarations (tree t)
8204 : {
8205 67782000 : tree next;
8206 67782000 : tree prev;
8207 67782000 : tree x;
8208 :
8209 : /* The following lists are all in reverse order. Put them in
8210 : declaration order now. */
8211 67782000 : CLASSTYPE_DECL_LIST (t) = nreverse (CLASSTYPE_DECL_LIST (t));
8212 :
8213 : /* For the TYPE_FIELDS, only the non TYPE_DECLs are in reverse
8214 : order, so we can't just use nreverse. Due to stat_hack
8215 : chicanery in finish_member_declaration. */
8216 67782000 : prev = NULL_TREE;
8217 67782000 : for (x = TYPE_FIELDS (t);
8218 328028422 : x && TREE_CODE (x) != TYPE_DECL;
8219 260246422 : x = next)
8220 : {
8221 260246422 : next = DECL_CHAIN (x);
8222 260246422 : DECL_CHAIN (x) = prev;
8223 260246422 : prev = x;
8224 : }
8225 :
8226 67782000 : if (prev)
8227 : {
8228 27132333 : DECL_CHAIN (TYPE_FIELDS (t)) = x;
8229 27132333 : TYPE_FIELDS (t) = prev;
8230 : }
8231 67782000 : }
8232 :
8233 : /* Classes, structs or unions T marked with hotness attributes propagate
8234 : the attribute to all methods. */
8235 :
8236 : void
8237 49090220 : propagate_class_warmth_attribute (tree t)
8238 : {
8239 49090220 : if (t == NULL_TREE
8240 49090220 : || !(TREE_CODE (t) == RECORD_TYPE
8241 : || TREE_CODE (t) == UNION_TYPE))
8242 : return;
8243 :
8244 49090220 : tree class_has_cold_attr
8245 49090220 : = lookup_attribute ("cold", TYPE_ATTRIBUTES (t));
8246 49090220 : tree class_has_hot_attr
8247 49090220 : = lookup_attribute ("hot", TYPE_ATTRIBUTES (t));
8248 :
8249 49090220 : if (class_has_cold_attr || class_has_hot_attr)
8250 42 : for (tree f = TYPE_FIELDS (t); f; f = DECL_CHAIN (f))
8251 30 : if (DECL_DECLARES_FUNCTION_P (f))
8252 18 : maybe_propagate_warmth_attributes (STRIP_TEMPLATE (f), t);
8253 : }
8254 :
8255 : tree
8256 29351013 : finish_struct (tree t, tree attributes)
8257 : {
8258 29351013 : location_t saved_loc = input_location;
8259 :
8260 : /* Now that we've got all the field declarations, reverse everything
8261 : as necessary. */
8262 29351013 : unreverse_member_declarations (t);
8263 :
8264 29351013 : cplus_decl_attributes (&t, attributes, (int) ATTR_FLAG_TYPE_IN_PLACE);
8265 29351013 : fixup_attribute_variants (t);
8266 :
8267 : /* Nadger the current location so that diagnostics point to the start of
8268 : the struct, not the end. */
8269 29351013 : input_location = DECL_SOURCE_LOCATION (TYPE_NAME (t));
8270 :
8271 29351013 : if (processing_template_decl)
8272 : {
8273 18691780 : tree x;
8274 :
8275 146309454 : for (x = TYPE_FIELDS (t); x; x = DECL_CHAIN (x))
8276 127617674 : if (DECL_DECLARES_FUNCTION_P (x))
8277 : {
8278 71294775 : DECL_IN_AGGR_P (x) = false;
8279 71294775 : if (DECL_VIRTUAL_P (x))
8280 1810867 : CLASSTYPE_NON_AGGREGATE (t) = true;
8281 : }
8282 56322899 : else if (TREE_CODE (x) == FIELD_DECL)
8283 : {
8284 11887759 : if (TREE_PROTECTED (x) || TREE_PRIVATE (x))
8285 6162669 : CLASSTYPE_NON_AGGREGATE (t) = true;
8286 : }
8287 :
8288 : /* Also add a USING_DECL for operator=. We know there'll be (at
8289 : least) one, but we don't know the signature(s). We want name
8290 : lookup not to fail or recurse into bases. This isn't added
8291 : to the template decl list so we drop this at instantiation
8292 : time. */
8293 18691780 : tree ass_op = build_lang_decl (USING_DECL, assign_op_identifier,
8294 : NULL_TREE);
8295 18691780 : DECL_CONTEXT (ass_op) = t;
8296 18691780 : USING_DECL_SCOPE (ass_op) = t;
8297 18691780 : DECL_DEPENDENT_P (ass_op) = true;
8298 18691780 : DECL_ARTIFICIAL (ass_op) = true;
8299 18691780 : DECL_CHAIN (ass_op) = TYPE_FIELDS (t);
8300 18691780 : TYPE_FIELDS (t) = ass_op;
8301 :
8302 18691780 : TYPE_SIZE (t) = bitsize_zero_node;
8303 18691780 : TYPE_SIZE_UNIT (t) = size_zero_node;
8304 : /* COMPLETE_TYPE_P is now true. */
8305 :
8306 18691780 : set_class_bindings (t);
8307 :
8308 : /* We need to emit an error message if this type was used as a parameter
8309 : and it is an abstract type, even if it is a template. We construct
8310 : a simple CLASSTYPE_PURE_VIRTUALS list without taking bases into
8311 : account and we call complete_vars with this type, which will check
8312 : the PARM_DECLS. Note that while the type is being defined,
8313 : CLASSTYPE_PURE_VIRTUALS contains the list of the inline friends
8314 : (see CLASSTYPE_INLINE_FRIENDS) so we need to clear it. */
8315 18691780 : CLASSTYPE_PURE_VIRTUALS (t) = NULL;
8316 165001234 : for (x = TYPE_FIELDS (t); x; x = DECL_CHAIN (x))
8317 146309454 : if (TREE_CODE (x) == FUNCTION_DECL && DECL_PURE_VIRTUAL_P (x))
8318 264260 : vec_safe_push (CLASSTYPE_PURE_VIRTUALS (t), x);
8319 18691780 : complete_vars (t);
8320 :
8321 : /* Remember current #pragma pack value. */
8322 18691780 : TYPE_PRECISION (t) = maximum_field_alignment;
8323 :
8324 18691780 : if (cxx_dialect < cxx20)
8325 : {
8326 583781 : if (!CLASSTYPE_NON_AGGREGATE (t)
8327 583781 : && type_has_user_provided_or_explicit_constructor (t))
8328 19115 : CLASSTYPE_NON_AGGREGATE (t) = 1;
8329 : }
8330 18107999 : else if (TYPE_HAS_USER_CONSTRUCTOR (t))
8331 5560653 : CLASSTYPE_NON_AGGREGATE (t) = 1;
8332 :
8333 : /* Fix up any variants we've already built. */
8334 18691780 : fixup_type_variants (t);
8335 : }
8336 : else
8337 10659233 : finish_struct_1 (t);
8338 : /* COMPLETE_TYPE_P is now true. */
8339 :
8340 29351013 : maybe_warn_about_overly_private_class (t);
8341 :
8342 29351013 : if (is_std_init_list (t))
8343 : {
8344 : /* People keep complaining that the compiler crashes on an invalid
8345 : definition of initializer_list, so I guess we should explicitly
8346 : reject it. What the compiler internals care about is that it's a
8347 : template and has a pointer field followed by size_type field. */
8348 13805 : bool ok = false;
8349 13805 : if (processing_template_decl)
8350 : {
8351 13805 : tree f = next_aggregate_field (TYPE_FIELDS (t));
8352 13805 : if (f && TYPE_PTR_P (TREE_TYPE (f)))
8353 : {
8354 13802 : f = next_aggregate_field (DECL_CHAIN (f));
8355 13802 : if (f && same_type_p (TREE_TYPE (f), size_type_node))
8356 : ok = true;
8357 : }
8358 : }
8359 : /* It also cannot be a union. */
8360 13805 : ok &= NON_UNION_CLASS_TYPE_P (t);
8361 13802 : if (!ok)
8362 9 : fatal_error (input_location, "definition of %qD does not match "
8363 9 : "%<#include <initializer_list>%>", TYPE_NAME (t));
8364 : }
8365 :
8366 29351004 : input_location = saved_loc;
8367 :
8368 29351004 : TYPE_BEING_DEFINED (t) = 0;
8369 :
8370 29351004 : if (current_class_type)
8371 29351004 : popclass ();
8372 : else
8373 0 : error ("trying to finish struct, but kicked out due to previous parse errors");
8374 :
8375 29351004 : if (flag_openmp)
8376 716850 : for (tree decl = TYPE_FIELDS (t); decl; decl = DECL_CHAIN (decl))
8377 603794 : if (TREE_CODE (decl) == FUNCTION_DECL
8378 603794 : && DECL_OBJECT_MEMBER_FUNCTION_P (decl))
8379 126496 : if (tree attr = lookup_attribute ("omp declare variant base",
8380 126496 : DECL_ATTRIBUTES (decl)))
8381 120 : omp_declare_variant_finalize (decl, attr);
8382 :
8383 18691771 : if (processing_template_decl && at_function_scope_p ()
8384 : /* Lambdas are defined by the LAMBDA_EXPR. */
8385 31717781 : && !LAMBDA_TYPE_P (t))
8386 238093 : add_stmt (build_min (TAG_DEFN, t));
8387 :
8388 : /* Lambdas will be keyed by their LAMBDA_TYPE_EXTRA_SCOPE when that
8389 : gets set; other local types might need keying anyway though. */
8390 30870749 : if (at_function_scope_p () && !LAMBDA_TYPE_P (t))
8391 245268 : maybe_key_decl (current_scope (), TYPE_NAME (t));
8392 :
8393 29351004 : return t;
8394 : }
8395 :
8396 : /* Hash table to avoid endless recursion when handling references. */
8397 : static hash_table<nofree_ptr_hash<tree_node> > *fixed_type_or_null_ref_ht;
8398 :
8399 : /* Return the dynamic type of INSTANCE, if known.
8400 : Used to determine whether the virtual function table is needed
8401 : or not.
8402 :
8403 : *NONNULL is set iff INSTANCE can be known to be nonnull, regardless
8404 : of our knowledge of its type. *NONNULL should be initialized
8405 : before this function is called. */
8406 :
8407 : static tree
8408 15180675 : fixed_type_or_null (tree instance, int *nonnull, int *cdtorp)
8409 : {
8410 : #define RECUR(T) fixed_type_or_null((T), nonnull, cdtorp)
8411 :
8412 15180675 : switch (TREE_CODE (instance))
8413 : {
8414 2247264 : case INDIRECT_REF:
8415 2247264 : if (INDIRECT_TYPE_P (TREE_TYPE (instance)))
8416 : return NULL_TREE;
8417 : else
8418 2234444 : return RECUR (TREE_OPERAND (instance, 0));
8419 :
8420 136042 : case CALL_EXPR:
8421 : /* This is a call to a constructor, hence it's never zero. */
8422 136042 : if (CALL_EXPR_FN (instance)
8423 136042 : && TREE_HAS_CONSTRUCTOR (instance))
8424 : {
8425 0 : if (nonnull)
8426 0 : *nonnull = 1;
8427 0 : return TREE_TYPE (instance);
8428 : }
8429 136042 : if (CLASS_TYPE_P (TREE_TYPE (instance)))
8430 : {
8431 : /* We missed a build_cplus_new somewhere, likely due to tf_decltype
8432 : mishandling. */
8433 0 : gcc_checking_assert (false);
8434 : if (nonnull)
8435 : *nonnull = 1;
8436 : return TREE_TYPE (instance);
8437 : }
8438 : return NULL_TREE;
8439 :
8440 45333 : case SAVE_EXPR:
8441 : /* This is a call to a constructor, hence it's never zero. */
8442 45333 : if (TREE_HAS_CONSTRUCTOR (instance))
8443 : {
8444 0 : if (nonnull)
8445 0 : *nonnull = 1;
8446 0 : return TREE_TYPE (instance);
8447 : }
8448 45333 : return RECUR (TREE_OPERAND (instance, 0));
8449 :
8450 261 : case POINTER_PLUS_EXPR:
8451 261 : case PLUS_EXPR:
8452 261 : case MINUS_EXPR:
8453 261 : if (TREE_CODE (TREE_OPERAND (instance, 0)) == ADDR_EXPR)
8454 24 : return RECUR (TREE_OPERAND (instance, 0));
8455 237 : if (TREE_CODE (TREE_OPERAND (instance, 1)) == INTEGER_CST)
8456 : /* Propagate nonnull. */
8457 33 : return RECUR (TREE_OPERAND (instance, 0));
8458 :
8459 : return NULL_TREE;
8460 :
8461 2810584 : CASE_CONVERT:
8462 2810584 : return RECUR (TREE_OPERAND (instance, 0));
8463 :
8464 795453 : case ADDR_EXPR:
8465 795453 : instance = TREE_OPERAND (instance, 0);
8466 795453 : if (nonnull)
8467 : {
8468 : /* Just because we see an ADDR_EXPR doesn't mean we're dealing
8469 : with a real object -- given &p->f, p can still be null. */
8470 793774 : tree t = get_base_address (instance);
8471 : /* ??? Probably should check DECL_WEAK here. */
8472 793774 : if (t && DECL_P (t))
8473 116639 : *nonnull = 1;
8474 : }
8475 795453 : return RECUR (instance);
8476 :
8477 1092582 : case COMPONENT_REF:
8478 : /* If this component is really a base class reference, then the field
8479 : itself isn't definitive. */
8480 1092582 : if (DECL_FIELD_IS_BASE (TREE_OPERAND (instance, 1)))
8481 1264 : return RECUR (TREE_OPERAND (instance, 0));
8482 1091318 : return RECUR (TREE_OPERAND (instance, 1));
8483 :
8484 1463886 : case VAR_DECL:
8485 1463886 : case FIELD_DECL:
8486 1463886 : if (TREE_CODE (TREE_TYPE (instance)) == ARRAY_TYPE
8487 1463886 : && MAYBE_CLASS_TYPE_P (TREE_TYPE (TREE_TYPE (instance))))
8488 : {
8489 45 : if (nonnull)
8490 45 : *nonnull = 1;
8491 45 : return TREE_TYPE (TREE_TYPE (instance));
8492 : }
8493 : /* fall through. */
8494 7470930 : case TARGET_EXPR:
8495 7470930 : case PARM_DECL:
8496 7470930 : case RESULT_DECL:
8497 7470930 : if (MAYBE_CLASS_TYPE_P (TREE_TYPE (instance)))
8498 : {
8499 1838554 : if (nonnull)
8500 1837100 : *nonnull = 1;
8501 1838554 : return TREE_TYPE (instance);
8502 : }
8503 5632376 : else if (instance == current_class_ptr)
8504 : {
8505 4791731 : if (nonnull)
8506 4150609 : *nonnull = 1;
8507 :
8508 : /* if we're in a ctor or dtor, we know our type. If
8509 : current_class_ptr is set but we aren't in a function, we're in
8510 : an NSDMI (and therefore a constructor). */
8511 4791731 : if (current_scope () != current_function_decl
8512 4791731 : || (DECL_LANG_SPECIFIC (current_function_decl)
8513 9583214 : && (DECL_CONSTRUCTOR_P (current_function_decl)
8514 2332136 : || DECL_DESTRUCTOR_P (current_function_decl))))
8515 : {
8516 2547955 : if (cdtorp)
8517 2547955 : *cdtorp = 1;
8518 2547955 : return TREE_TYPE (TREE_TYPE (instance));
8519 : }
8520 : }
8521 840645 : else if (TYPE_REF_P (TREE_TYPE (instance)))
8522 : {
8523 : /* We only need one hash table because it is always left empty. */
8524 672169 : if (!fixed_type_or_null_ref_ht)
8525 13369 : fixed_type_or_null_ref_ht
8526 13369 : = new hash_table<nofree_ptr_hash<tree_node> > (37);
8527 :
8528 : /* Reference variables should be references to objects. */
8529 672169 : if (nonnull)
8530 669709 : *nonnull = 1;
8531 :
8532 : /* Enter the INSTANCE in a table to prevent recursion; a
8533 : variable's initializer may refer to the variable
8534 : itself. */
8535 672169 : if (VAR_P (instance)
8536 22026 : && DECL_INITIAL (instance)
8537 2452 : && !type_dependent_expression_p_push (DECL_INITIAL (instance))
8538 674621 : && !fixed_type_or_null_ref_ht->find (instance))
8539 : {
8540 2396 : tree type;
8541 2396 : tree_node **slot;
8542 :
8543 2396 : slot = fixed_type_or_null_ref_ht->find_slot (instance, INSERT);
8544 2396 : *slot = instance;
8545 2396 : type = RECUR (DECL_INITIAL (instance));
8546 2396 : fixed_type_or_null_ref_ht->remove_elt (instance);
8547 :
8548 2396 : return type;
8549 : }
8550 : }
8551 : return NULL_TREE;
8552 :
8553 353472 : case VIEW_CONVERT_EXPR:
8554 353472 : if (location_wrapper_p (instance))
8555 353472 : return RECUR (TREE_OPERAND (instance, 0));
8556 : else
8557 : /* TODO: Recursion may be correct for some non-location-wrapper
8558 : uses of VIEW_CONVERT_EXPR. */
8559 : return NULL_TREE;
8560 :
8561 : default:
8562 : return NULL_TREE;
8563 : }
8564 : #undef RECUR
8565 : }
8566 :
8567 : /* Return nonzero if the dynamic type of INSTANCE is known, and
8568 : equivalent to the static type. We also handle the case where
8569 : INSTANCE is really a pointer. Return negative if this is a
8570 : ctor/dtor. There the dynamic type is known, but this might not be
8571 : the most derived base of the original object, and hence virtual
8572 : bases may not be laid out according to this type.
8573 :
8574 : Used to determine whether the virtual function table is needed
8575 : or not.
8576 :
8577 : *NONNULL is set iff INSTANCE can be known to be nonnull, regardless
8578 : of our knowledge of its type. *NONNULL should be initialized
8579 : before this function is called. */
8580 :
8581 : int
8582 7378372 : resolves_to_fixed_type_p (tree instance, int* nonnull)
8583 : {
8584 7378372 : tree t = TREE_TYPE (instance);
8585 7378372 : int cdtorp = 0;
8586 7378372 : tree fixed;
8587 :
8588 : /* processing_template_decl can be false in a template if we're in
8589 : instantiate_non_dependent_expr, but we still want to suppress
8590 : this check. */
8591 7378372 : if (in_template_context)
8592 : {
8593 : /* In a template we only care about the type of the result. */
8594 13 : if (nonnull)
8595 2 : *nonnull = true;
8596 13 : return true;
8597 : }
8598 :
8599 7378359 : fixed = fixed_type_or_null (instance, nonnull, &cdtorp);
8600 7378359 : if (INDIRECT_TYPE_P (t))
8601 4568257 : t = TREE_TYPE (t);
8602 7378359 : if (CLASS_TYPE_P (t) && CLASSTYPE_FINAL (t))
8603 : return 1;
8604 7316328 : if (fixed == NULL_TREE)
8605 : return 0;
8606 4351153 : if (!same_type_ignoring_top_level_qualifiers_p (t, fixed))
8607 : return 0;
8608 4350687 : return cdtorp ? -1 : 1;
8609 : }
8610 :
8611 :
8612 : void
8613 97879 : init_class_processing (void)
8614 : {
8615 97879 : current_class_depth = 0;
8616 97879 : current_class_stack_size = 10;
8617 97879 : current_class_stack
8618 97879 : = XNEWVEC (struct class_stack_node, current_class_stack_size);
8619 97879 : sizeof_biggest_empty_class = size_zero_node;
8620 :
8621 97879 : ridpointers[(int) RID_PUBLIC] = access_public_node;
8622 97879 : ridpointers[(int) RID_PRIVATE] = access_private_node;
8623 97879 : ridpointers[(int) RID_PROTECTED] = access_protected_node;
8624 97879 : }
8625 :
8626 : /* Restore the cached PREVIOUS_CLASS_LEVEL. */
8627 :
8628 : static void
8629 199942909 : restore_class_cache (void)
8630 : {
8631 199942909 : tree type;
8632 :
8633 : /* We are re-entering the same class we just left, so we don't
8634 : have to search the whole inheritance matrix to find all the
8635 : decls to bind again. Instead, we install the cached
8636 : class_shadowed list and walk through it binding names. */
8637 199942909 : push_binding_level (previous_class_level);
8638 199942909 : class_binding_level = previous_class_level;
8639 : /* Restore IDENTIFIER_TYPE_VALUE. */
8640 199942909 : for (type = class_binding_level->type_shadowed;
8641 1029748388 : type;
8642 829805479 : type = TREE_CHAIN (type))
8643 829805479 : SET_IDENTIFIER_TYPE_VALUE (TREE_PURPOSE (type), TREE_TYPE (type));
8644 199942909 : }
8645 :
8646 : /* Set global variables CURRENT_CLASS_NAME and CURRENT_CLASS_TYPE as
8647 : appropriate for TYPE.
8648 :
8649 : So that we may avoid calls to lookup_name, we cache the _TYPE
8650 : nodes of local TYPE_DECLs in the TREE_TYPE field of the name.
8651 :
8652 : For multiple inheritance, we perform a two-pass depth-first search
8653 : of the type lattice. */
8654 :
8655 : void
8656 432542555 : pushclass (tree type)
8657 : {
8658 432542555 : class_stack_node_t csn;
8659 :
8660 432542555 : type = TYPE_MAIN_VARIANT (type);
8661 :
8662 : /* Make sure there is enough room for the new entry on the stack. */
8663 432542555 : if (current_class_depth + 1 >= current_class_stack_size)
8664 : {
8665 11151 : current_class_stack_size *= 2;
8666 11151 : current_class_stack
8667 11151 : = XRESIZEVEC (struct class_stack_node, current_class_stack,
8668 : current_class_stack_size);
8669 : }
8670 :
8671 : /* Insert a new entry on the class stack. */
8672 432542555 : csn = current_class_stack + current_class_depth;
8673 432542555 : csn->name = current_class_name;
8674 432542555 : csn->type = current_class_type;
8675 432542555 : csn->access = current_access_specifier;
8676 432542555 : csn->names_used = 0;
8677 432542555 : csn->hidden = 0;
8678 432542555 : current_class_depth++;
8679 :
8680 : /* Now set up the new type. */
8681 432542555 : current_class_name = TYPE_NAME (type);
8682 432542555 : if (TREE_CODE (current_class_name) == TYPE_DECL)
8683 432542555 : current_class_name = DECL_NAME (current_class_name);
8684 432542555 : current_class_type = type;
8685 :
8686 : /* By default, things in classes are private, while things in
8687 : structures or unions are public. */
8688 432542555 : current_access_specifier = (CLASSTYPE_DECLARED_CLASS (type)
8689 432542555 : ? access_private_node
8690 : : access_public_node);
8691 :
8692 432542555 : if (previous_class_level
8693 258980353 : && type != previous_class_level->this_entity
8694 54440783 : && current_class_depth == 1)
8695 : {
8696 : /* Forcibly remove any old class remnants. */
8697 29114047 : invalidate_class_lookup_cache ();
8698 : }
8699 :
8700 432542555 : if (!previous_class_level
8701 229866306 : || type != previous_class_level->this_entity
8702 204539570 : || current_class_depth > 1)
8703 232599646 : pushlevel_class ();
8704 : else
8705 199942909 : restore_class_cache ();
8706 432542555 : }
8707 :
8708 : /* Get out of the current class scope. If we were in a class scope
8709 : previously, that is the one popped to. */
8710 :
8711 : void
8712 432526292 : popclass (void)
8713 : {
8714 432526292 : poplevel_class ();
8715 :
8716 432526289 : current_class_depth--;
8717 432526289 : current_class_name = current_class_stack[current_class_depth].name;
8718 432526289 : current_class_type = current_class_stack[current_class_depth].type;
8719 432526289 : current_access_specifier = current_class_stack[current_class_depth].access;
8720 432526289 : if (current_class_stack[current_class_depth].names_used)
8721 16393010 : splay_tree_delete (current_class_stack[current_class_depth].names_used);
8722 432526289 : }
8723 :
8724 : /* Mark the top of the class stack as hidden. */
8725 :
8726 : void
8727 488212063 : push_class_stack (void)
8728 : {
8729 488212063 : if (current_class_depth)
8730 331177746 : ++current_class_stack[current_class_depth - 1].hidden;
8731 488212063 : }
8732 :
8733 : /* Mark the top of the class stack as un-hidden. */
8734 :
8735 : void
8736 488087094 : pop_class_stack (void)
8737 : {
8738 488087094 : if (current_class_depth)
8739 331164210 : --current_class_stack[current_class_depth - 1].hidden;
8740 488087094 : }
8741 :
8742 : /* If the class type currently being defined is either T or
8743 : a nested type of T, returns the type from the current_class_stack,
8744 : which might be equivalent to but not equal to T in case of
8745 : constrained partial specializations. */
8746 :
8747 : tree
8748 4936142574 : currently_open_class (tree t)
8749 : {
8750 4936142574 : int i;
8751 :
8752 4936142574 : if (!CLASS_TYPE_P (t))
8753 : return NULL_TREE;
8754 :
8755 4757428419 : t = TYPE_MAIN_VARIANT (t);
8756 :
8757 : /* We start looking from 1 because entry 0 is from global scope,
8758 : and has no type. */
8759 5907171048 : for (i = current_class_depth; i > 0; --i)
8760 : {
8761 4948909658 : tree c;
8762 4948909658 : if (i == current_class_depth)
8763 4363051906 : c = current_class_type;
8764 : else
8765 : {
8766 585857752 : if (current_class_stack[i].hidden)
8767 : break;
8768 438226449 : c = current_class_stack[i].type;
8769 : }
8770 4801278355 : if (!c)
8771 285845546 : continue;
8772 4515432809 : if (same_type_p (c, t))
8773 : return c;
8774 : }
8775 : return NULL_TREE;
8776 : }
8777 :
8778 : /* If either current_class_type or one of its enclosing classes are derived
8779 : from T, return the appropriate type. Used to determine how we found
8780 : something via unqualified lookup. */
8781 :
8782 : tree
8783 159313299 : currently_open_derived_class (tree t)
8784 : {
8785 159313299 : int i;
8786 :
8787 : /* The bases of a dependent type are unknown. */
8788 159313299 : if (dependent_type_p (t))
8789 : return NULL_TREE;
8790 :
8791 153287719 : if (!current_class_type)
8792 : return NULL_TREE;
8793 :
8794 151906178 : if (DERIVED_FROM_P (t, current_class_type))
8795 138614281 : return current_class_type;
8796 :
8797 17757705 : for (i = current_class_depth - 1; i > 0; --i)
8798 : {
8799 7590880 : if (current_class_stack[i].hidden)
8800 : break;
8801 7590880 : if (DERIVED_FROM_P (t, current_class_stack[i].type))
8802 3125072 : return current_class_stack[i].type;
8803 : }
8804 :
8805 : return NULL_TREE;
8806 : }
8807 :
8808 : /* Return the outermost enclosing class type that is still open, or
8809 : NULL_TREE. */
8810 :
8811 : tree
8812 21 : outermost_open_class (void)
8813 : {
8814 21 : if (!current_class_type)
8815 : return NULL_TREE;
8816 21 : tree r = NULL_TREE;
8817 21 : if (TYPE_BEING_DEFINED (current_class_type))
8818 21 : r = current_class_type;
8819 21 : for (int i = current_class_depth - 1; i > 0; --i)
8820 : {
8821 0 : if (current_class_stack[i].hidden)
8822 : break;
8823 0 : tree t = current_class_stack[i].type;
8824 0 : if (!TYPE_BEING_DEFINED (t))
8825 : break;
8826 0 : r = t;
8827 : }
8828 : return r;
8829 : }
8830 :
8831 : /* Returns the innermost class type which is not a lambda closure type. */
8832 :
8833 : tree
8834 1300355457 : current_nonlambda_class_type (void)
8835 : {
8836 1300355457 : tree type = current_class_type;
8837 2319845454 : while (type && LAMBDA_TYPE_P (type))
8838 2715744 : type = decl_type_context (TYPE_NAME (type));
8839 1300355457 : return type;
8840 : }
8841 :
8842 : /* When entering a class scope, all enclosing class scopes' names with
8843 : static meaning (static variables, static functions, types and
8844 : enumerators) have to be visible. This recursive function calls
8845 : pushclass for all enclosing class contexts until global or a local
8846 : scope is reached. TYPE is the enclosed class. */
8847 :
8848 : void
8849 709448017 : push_nested_class (tree type)
8850 : {
8851 : /* A namespace might be passed in error cases, like A::B:C. */
8852 709448017 : if (type == NULL_TREE
8853 709448017 : || !CLASS_TYPE_P (type))
8854 : return;
8855 :
8856 364576792 : push_nested_class (DECL_CONTEXT (TYPE_MAIN_DECL (type)));
8857 :
8858 364576792 : pushclass (type);
8859 : }
8860 :
8861 : /* Undoes a push_nested_class call. */
8862 :
8863 : void
8864 344857677 : pop_nested_class (void)
8865 : {
8866 364560544 : tree context = DECL_CONTEXT (TYPE_MAIN_DECL (current_class_type));
8867 :
8868 364560544 : popclass ();
8869 364560544 : if (context && CLASS_TYPE_P (context))
8870 : pop_nested_class ();
8871 344857677 : }
8872 :
8873 : /* Returns the number of extern "LANG" blocks we are nested within. */
8874 :
8875 : int
8876 3427 : current_lang_depth (void)
8877 : {
8878 3427 : return vec_safe_length (current_lang_base);
8879 : }
8880 :
8881 : /* Set global variables CURRENT_LANG_NAME to appropriate value
8882 : so that behavior of name-mangling machinery is correct. */
8883 :
8884 : void
8885 1152146 : push_lang_context (tree name)
8886 : {
8887 1152146 : vec_safe_push (current_lang_base, current_lang_name);
8888 :
8889 1152146 : if (name == lang_name_cplusplus)
8890 608196 : current_lang_name = name;
8891 543950 : else if (name == lang_name_c)
8892 543950 : current_lang_name = name;
8893 : else
8894 0 : error ("language string %<\"%E\"%> not recognized", name);
8895 1152146 : }
8896 :
8897 : /* Get out of the current language scope. */
8898 :
8899 : void
8900 1152146 : pop_lang_context (void)
8901 : {
8902 1152146 : current_lang_name = current_lang_base->pop ();
8903 1152146 : }
8904 :
8905 : /* Type instantiation routines. */
8906 :
8907 : /* Given an OVERLOAD and a TARGET_TYPE, return the function that
8908 : matches the TARGET_TYPE. If there is no satisfactory match, return
8909 : error_mark_node, and issue an error & warning messages under
8910 : control of FLAGS. Permit pointers to member function if FLAGS
8911 : permits. If TEMPLATE_ONLY, the name of the overloaded function was
8912 : a template-id, and EXPLICIT_TARGS are the explicitly provided
8913 : template arguments.
8914 :
8915 : If OVERLOAD is for one or more member functions, then ACCESS_PATH
8916 : is the base path used to reference those member functions. If
8917 : the address is resolved to a member function, access checks will be
8918 : performed and errors issued if appropriate. */
8919 :
8920 : static tree
8921 673393 : resolve_address_of_overloaded_function (tree target_type,
8922 : tree overload,
8923 : tsubst_flags_t complain,
8924 : bool template_only,
8925 : tree explicit_targs,
8926 : tree access_path)
8927 : {
8928 : /* Here's what the standard says:
8929 :
8930 : [over.over]
8931 :
8932 : If the name is a function template, template argument deduction
8933 : is done, and if the argument deduction succeeds, the deduced
8934 : arguments are used to generate a single template function, which
8935 : is added to the set of overloaded functions considered.
8936 :
8937 : Non-member functions and static member functions match targets of
8938 : type "pointer-to-function" or "reference-to-function." Nonstatic
8939 : member functions match targets of type "pointer-to-member
8940 : function;" the function type of the pointer to member is used to
8941 : select the member function from the set of overloaded member
8942 : functions. If a non-static member function is selected, the
8943 : reference to the overloaded function name is required to have the
8944 : form of a pointer to member as described in 5.3.1.
8945 :
8946 : If more than one function is selected, any template functions in
8947 : the set are eliminated if the set also contains a non-template
8948 : function, and any given template function is eliminated if the
8949 : set contains a second template function that is more specialized
8950 : than the first according to the partial ordering rules 14.5.5.2.
8951 : After such eliminations, if any, there shall remain exactly one
8952 : selected function. */
8953 :
8954 673393 : int is_ptrmem = 0;
8955 : /* We store the matches in a TREE_LIST rooted here. The functions
8956 : are the TREE_PURPOSE, not the TREE_VALUE, in this list, for easy
8957 : interoperability with most_specialized_instantiation. */
8958 673393 : tree matches = NULL_TREE;
8959 673393 : tree fn;
8960 673393 : tree target_fn_type;
8961 :
8962 : /* By the time we get here, we should be seeing only real
8963 : pointer-to-member types, not the internal POINTER_TYPE to
8964 : METHOD_TYPE representation. */
8965 673393 : gcc_assert (!TYPE_PTR_P (target_type)
8966 : || TREE_CODE (TREE_TYPE (target_type)) != METHOD_TYPE);
8967 :
8968 673393 : gcc_assert (is_overloaded_fn (overload));
8969 :
8970 : /* Check that the TARGET_TYPE is reasonable. */
8971 47687 : if (TYPE_PTRFN_P (target_type)
8972 673397 : || TYPE_REFFN_P (target_type))
8973 : /* This is OK. */;
8974 625708 : else if (TYPE_PTRMEMFUNC_P (target_type))
8975 : /* This is OK, too. */
8976 : is_ptrmem = 1;
8977 624448 : else if (TREE_CODE (target_type) == FUNCTION_TYPE)
8978 : /* This is OK, too. This comes from a conversion to reference
8979 : type. */
8980 624405 : target_type = build_reference_type (target_type);
8981 : else
8982 : {
8983 43 : if (complain & tf_error)
8984 34 : error ("cannot resolve overloaded function %qD based on"
8985 : " conversion to type %qT",
8986 34 : OVL_NAME (overload), target_type);
8987 43 : return error_mark_node;
8988 : }
8989 :
8990 : /* Non-member functions and static member functions match targets of type
8991 : "pointer-to-function" or "reference-to-function." Nonstatic member
8992 : functions match targets of type "pointer-to-member-function;" the
8993 : function type of the pointer to member is used to select the member
8994 : function from the set of overloaded member functions.
8995 :
8996 : So figure out the FUNCTION_TYPE that we want to match against. */
8997 673350 : target_fn_type = static_fn_type (target_type);
8998 :
8999 : /* If we can find a non-template function that matches, we can just
9000 : use it. There's no point in generating template instantiations
9001 : if we're just going to throw them out anyhow. But, of course, we
9002 : can only do this when we don't *need* a template function. */
9003 673350 : if (!template_only)
9004 5045468 : for (lkp_iterator iter (overload); iter; ++iter)
9005 : {
9006 4396038 : tree fn = *iter;
9007 :
9008 4396038 : if (TREE_CODE (fn) == TEMPLATE_DECL)
9009 : /* We're not looking for templates just yet. */
9010 23872 : continue;
9011 :
9012 4372166 : if ((TREE_CODE (TREE_TYPE (fn)) == METHOD_TYPE) != is_ptrmem)
9013 : /* We're looking for a non-static member, and this isn't
9014 : one, or vice versa. */
9015 580 : continue;
9016 :
9017 : /* Constraints must be satisfied. This is done before
9018 : return type deduction since that instantiates the
9019 : function. */
9020 4371586 : if (!constraints_satisfied_p (fn))
9021 27 : continue;
9022 :
9023 : /* For target_version semantics, never resolve a non-default
9024 : version. */
9025 4371559 : if (!TARGET_HAS_FMV_TARGET_ATTRIBUTE
9026 : && TREE_CODE (fn) == FUNCTION_DECL
9027 : && !is_function_default_version (fn))
9028 : continue;
9029 :
9030 4371559 : if (undeduced_auto_decl (fn))
9031 : {
9032 : /* Force instantiation to do return type deduction. */
9033 18 : maybe_instantiate_decl (fn);
9034 18 : require_deduced_type (fn);
9035 : }
9036 :
9037 : /* In C++17 we need the noexcept-qualifier to compare types. */
9038 4371559 : if (flag_noexcept_type
9039 4371559 : && !maybe_instantiate_noexcept (fn, complain))
9040 0 : continue;
9041 :
9042 : /* See if there's a match. */
9043 4371559 : tree fntype = static_fn_type (fn);
9044 4371559 : if (same_type_p (target_fn_type, fntype)
9045 4371559 : || fnptr_conv_p (target_fn_type, fntype))
9046 626165 : matches = tree_cons (fn, NULL_TREE, matches);
9047 : }
9048 :
9049 : /* Now, if we've already got a match (or matches), there's no need
9050 : to proceed to the template functions. But, if we don't have a
9051 : match we need to look at them, too. */
9052 649430 : if (!matches)
9053 : {
9054 47758 : tree target_arg_types;
9055 47758 : tree target_ret_type;
9056 47758 : tree *args;
9057 47758 : unsigned int nargs, ia;
9058 47758 : tree arg;
9059 :
9060 47758 : target_arg_types = TYPE_ARG_TYPES (target_fn_type);
9061 47758 : target_ret_type = TREE_TYPE (target_fn_type);
9062 :
9063 47758 : nargs = list_length (target_arg_types);
9064 47758 : args = XALLOCAVEC (tree, nargs);
9065 47758 : for (arg = target_arg_types, ia = 0;
9066 150235 : arg != NULL_TREE;
9067 102477 : arg = TREE_CHAIN (arg), ++ia)
9068 102477 : args[ia] = TREE_VALUE (arg);
9069 47758 : nargs = ia;
9070 :
9071 98822 : for (lkp_iterator iter (overload); iter; ++iter)
9072 : {
9073 51064 : tree fn = *iter;
9074 51064 : tree instantiation;
9075 51064 : tree targs;
9076 :
9077 51064 : if (TREE_CODE (fn) != TEMPLATE_DECL)
9078 : /* We're only looking for templates. */
9079 3519 : continue;
9080 :
9081 47545 : if ((TREE_CODE (TREE_TYPE (fn)) == METHOD_TYPE)
9082 : != is_ptrmem)
9083 : /* We're not looking for a non-static member, and this is
9084 : one, or vice versa. */
9085 12 : continue;
9086 :
9087 47533 : tree ret = target_ret_type;
9088 :
9089 : /* If the template has a deduced return type, don't expose it to
9090 : template argument deduction. */
9091 47533 : if (undeduced_auto_decl (fn))
9092 230 : ret = NULL_TREE;
9093 :
9094 : /* Try to do argument deduction. */
9095 47533 : targs = make_tree_vec (DECL_NTPARMS (fn));
9096 47533 : instantiation = fn_type_unification (fn, explicit_targs, targs, args,
9097 : nargs, ret,
9098 : DEDUCE_EXACT, LOOKUP_NORMAL,
9099 : NULL, false, false);
9100 47533 : if (instantiation == error_mark_node)
9101 : /* Instantiation failed. */
9102 11285 : continue;
9103 :
9104 : /* Constraints must be satisfied. This is done before
9105 : return type deduction since that instantiates the
9106 : function. */
9107 36248 : if (flag_concepts && !constraints_satisfied_p (instantiation))
9108 0 : continue;
9109 :
9110 : /* And now force instantiation to do return type deduction. */
9111 36248 : if (undeduced_auto_decl (instantiation))
9112 : {
9113 68 : ++function_depth;
9114 68 : instantiate_decl (instantiation, /*defer*/false, /*class*/false);
9115 68 : --function_depth;
9116 :
9117 68 : require_deduced_type (instantiation);
9118 : }
9119 :
9120 : /* In C++17 we need the noexcept-qualifier to compare types. */
9121 36248 : if (flag_noexcept_type)
9122 35376 : maybe_instantiate_noexcept (instantiation, complain);
9123 :
9124 : /* See if there's a match. */
9125 36248 : tree fntype = static_fn_type (instantiation);
9126 36248 : if (same_type_p (target_fn_type, fntype)
9127 36248 : || fnptr_conv_p (target_fn_type, fntype))
9128 36230 : matches = tree_cons (instantiation, fn, matches);
9129 : }
9130 :
9131 : /* Now, remove all but the most specialized of the matches. */
9132 47758 : if (matches)
9133 : {
9134 36119 : tree match = most_specialized_instantiation (matches);
9135 :
9136 36119 : if (match != error_mark_node)
9137 : {
9138 36092 : matches = match;
9139 36092 : TREE_CHAIN (match) = NULL_TREE;
9140 : }
9141 : }
9142 : }
9143 625592 : else if (flag_concepts && TREE_CHAIN (matches))
9144 97 : if (tree match = most_constrained_function (matches))
9145 : {
9146 9 : matches = match;
9147 9 : TREE_CHAIN (match) = NULL_TREE;
9148 : }
9149 :
9150 : /* Now we should have exactly one function in MATCHES. */
9151 661711 : if (matches == NULL_TREE)
9152 : {
9153 : /* There were *no* matches. */
9154 11639 : if (complain & tf_error)
9155 : {
9156 87 : auto_diagnostic_group d;
9157 174 : error ("no matches converting function %qD to type %q#T",
9158 87 : OVL_NAME (overload), target_type);
9159 :
9160 87 : print_candidates (input_location, overload);
9161 87 : }
9162 11639 : return error_mark_node;
9163 : }
9164 661711 : else if (TREE_CHAIN (matches))
9165 : {
9166 : /* There were too many matches. First check if they're all
9167 : the same function. */
9168 159 : tree match = NULL_TREE;
9169 :
9170 159 : fn = TREE_PURPOSE (matches);
9171 :
9172 : /* For multi-versioned functions, more than one match is just fine and
9173 : decls_match will return false as they are different. */
9174 723 : for (match = TREE_CHAIN (matches); match; match = TREE_CHAIN (match))
9175 591 : if (!decls_match (fn, TREE_PURPOSE (match))
9176 1167 : && !disjoint_version_decls (fn, TREE_PURPOSE (match)))
9177 : break;
9178 :
9179 159 : if (match)
9180 : {
9181 27 : if (complain & tf_error)
9182 : {
9183 9 : auto_diagnostic_group d;
9184 9 : error ("converting overloaded function %qD to type %q#T is ambiguous",
9185 9 : OVL_NAME (overload), target_type);
9186 :
9187 : /* Since print_candidates expects the functions in the
9188 : TREE_VALUE slot, we flip them here. */
9189 36 : for (match = matches; match; match = TREE_CHAIN (match))
9190 18 : TREE_VALUE (match) = TREE_PURPOSE (match);
9191 :
9192 9 : print_candidates (input_location, matches);
9193 9 : }
9194 :
9195 27 : return error_mark_node;
9196 : }
9197 : }
9198 :
9199 : /* Good, exactly one match. Now, convert it to the correct type. */
9200 661684 : fn = TREE_PURPOSE (matches);
9201 :
9202 1322179 : if (DECL_OBJECT_MEMBER_FUNCTION_P (fn)
9203 661948 : && !(complain & tf_ptrmem_ok))
9204 : {
9205 : /* Previously we allowed this behavior for iobj member functions when the
9206 : -fms-extensions flag is passed as MSVC allows this as a language
9207 : extension. MSVC also allows this for xobj member functions, but the
9208 : documentation for -fms-extensions states it's purpose is to support
9209 : the use of microsoft headers. Until otherwise demonstrated, we should
9210 : assume xobj member functions are not used in this manner in microsoft
9211 : headers and forbid the incorrect syntax instead of supporting it for
9212 : non-legacy uses. This should hopefully encourage conformance going
9213 : forward.
9214 : This comment is referred to in typeck.cc:cp_build_addr_expr_1. */
9215 270 : if (DECL_IOBJ_MEMBER_FUNCTION_P (fn) && flag_ms_extensions)
9216 : /* Early escape. */;
9217 249 : else if (!(complain & tf_error))
9218 179 : return error_mark_node;
9219 70 : else if (DECL_XOBJ_MEMBER_FUNCTION_P (fn))
9220 : {
9221 34 : auto_diagnostic_group d;
9222 : /* Should match the error in typeck.cc:cp_build_addr_expr_1.
9223 : We seem to lack the details here to match that diagnostic exactly,
9224 : perhaps this could be fixed in the future? See PR113075 bug 2. */
9225 34 : error_at (input_location,
9226 : "ISO C++ forbids taking the address of an unqualified"
9227 : " or parenthesized non-static member function to form"
9228 : " a pointer to explicit object member function.");
9229 : /* This is incorrect, see PR113075 bug 3. */
9230 34 : inform (input_location,
9231 : "a pointer to explicit object member function can only be "
9232 : "formed with %<&%E%>", fn);
9233 34 : }
9234 : else
9235 : {
9236 36 : static int explained;
9237 36 : gcc_assert (DECL_IOBJ_MEMBER_FUNCTION_P (fn) && !flag_ms_extensions);
9238 : /* Is there a reason this error message doesn't match the one in
9239 : typeck.cc:cp_build_addr_expr_1? */
9240 36 : auto_diagnostic_group d;
9241 36 : if (permerror (input_location, "assuming pointer to member %qD", fn)
9242 36 : && !explained)
9243 : {
9244 18 : inform (input_location, "(a pointer to member can only be "
9245 : "formed with %<&%E%>)", fn);
9246 18 : explained = 1;
9247 : }
9248 36 : }
9249 : }
9250 :
9251 : /* If a pointer to a function that is multi-versioned is requested, the
9252 : pointer to the dispatcher function is returned instead. This works
9253 : well because indirectly calling the function will dispatch the right
9254 : function version at run-time.
9255 : This is done at multiple_target.cc for target_version semantics. */
9256 :
9257 661505 : if (DECL_FUNCTION_VERSIONED (fn) && TARGET_HAS_FMV_TARGET_ATTRIBUTE)
9258 : {
9259 117 : fn = get_function_version_dispatcher (fn);
9260 117 : if (fn == NULL)
9261 9 : return error_mark_node;
9262 : /* Mark all the versions corresponding to the dispatcher as used. */
9263 108 : if (!(complain & tf_conv))
9264 36 : mark_versions_used (fn);
9265 : }
9266 :
9267 : /* If we're doing overload resolution purely for the purpose of
9268 : determining conversion sequences, we should not consider the
9269 : function used. If this conversion sequence is selected, the
9270 : function will be marked as used at this point. */
9271 661424 : if (!(complain & tf_conv))
9272 : {
9273 : /* Make =delete work with SFINAE. */
9274 641530 : if (DECL_DELETED_FN (fn) && !(complain & tf_error))
9275 0 : return error_mark_node;
9276 641530 : if (!mark_used (fn, complain) && !(complain & tf_error))
9277 0 : return error_mark_node;
9278 : }
9279 :
9280 : /* We could not check access to member functions when this
9281 : expression was originally created since we did not know at that
9282 : time to which function the expression referred. */
9283 661496 : if (DECL_FUNCTION_MEMBER_P (fn))
9284 : {
9285 6176 : gcc_assert (access_path);
9286 6176 : perform_or_defer_access_check (access_path, fn, fn, complain);
9287 : }
9288 :
9289 661496 : if (TYPE_PTRFN_P (target_type) || TYPE_PTRMEMFUNC_P (target_type))
9290 37760 : return cp_build_addr_expr (fn, complain);
9291 : else
9292 : {
9293 : /* The target must be a REFERENCE_TYPE. Above, cp_build_unary_op
9294 : will mark the function as addressed, but here we must do it
9295 : explicitly. */
9296 623736 : cxx_mark_addressable (fn);
9297 :
9298 623736 : return fn;
9299 : }
9300 : }
9301 :
9302 : /* This function will instantiate the type of the expression given in
9303 : RHS to match the type of LHSTYPE. If errors exist, then return
9304 : error_mark_node. COMPLAIN is a bit mask. If TF_ERROR is set, then
9305 : we complain on errors. If we are not complaining, never modify rhs,
9306 : as overload resolution wants to try many possible instantiations, in
9307 : the hope that at least one will work.
9308 :
9309 : For non-recursive calls, LHSTYPE should be a function, pointer to
9310 : function, or a pointer to member function. */
9311 :
9312 : tree
9313 675707 : instantiate_type (tree lhstype, tree rhs, tsubst_flags_t complain)
9314 : {
9315 684789 : tsubst_flags_t complain_in = complain;
9316 684789 : tree access_path = NULL_TREE;
9317 :
9318 684789 : complain &= ~tf_ptrmem_ok;
9319 :
9320 684789 : STRIP_ANY_LOCATION_WRAPPER (rhs);
9321 :
9322 684789 : if (lhstype == unknown_type_node)
9323 : {
9324 0 : if (complain & tf_error)
9325 0 : error ("not enough type information");
9326 0 : return error_mark_node;
9327 : }
9328 :
9329 684789 : if (TREE_TYPE (rhs) != NULL_TREE && ! (type_unknown_p (rhs)))
9330 : {
9331 1723 : tree fntype = non_reference (lhstype);
9332 1723 : if (same_type_p (fntype, TREE_TYPE (rhs)))
9333 : return rhs;
9334 324 : if (fnptr_conv_p (fntype, TREE_TYPE (rhs)))
9335 : return rhs;
9336 321 : if (flag_ms_extensions
9337 18 : && TYPE_PTRMEMFUNC_P (fntype)
9338 339 : && !TYPE_PTRMEMFUNC_P (TREE_TYPE (rhs)))
9339 : /* Microsoft allows `A::f' to be resolved to a
9340 : pointer-to-member. */
9341 : ;
9342 : else
9343 : {
9344 303 : if (complain & tf_error)
9345 43 : error ("cannot convert %qE from type %qT to type %qT",
9346 43 : rhs, TREE_TYPE (rhs), fntype);
9347 303 : return error_mark_node;
9348 : }
9349 : }
9350 :
9351 : /* If we instantiate a template, and it is a A ?: C expression
9352 : with omitted B, look through the SAVE_EXPR. */
9353 683084 : if (TREE_CODE (rhs) == SAVE_EXPR)
9354 9 : rhs = TREE_OPERAND (rhs, 0);
9355 :
9356 683084 : if (BASELINK_P (rhs))
9357 : {
9358 6511 : access_path = BASELINK_ACCESS_BINFO (rhs);
9359 6511 : rhs = BASELINK_FUNCTIONS (rhs);
9360 : }
9361 :
9362 : /* There are only a few kinds of expressions that may have a type
9363 : dependent on overload resolution. */
9364 683084 : gcc_assert (TREE_CODE (rhs) == ADDR_EXPR
9365 : || TREE_CODE (rhs) == COMPONENT_REF
9366 : || is_overloaded_fn (rhs)
9367 : || (flag_ms_extensions && TREE_CODE (rhs) == FUNCTION_DECL));
9368 :
9369 : /* This should really only be used when attempting to distinguish
9370 : what sort of a pointer to function we have. For now, any
9371 : arithmetic operation which is not supported on pointers
9372 : is rejected as an error. */
9373 :
9374 683084 : switch (TREE_CODE (rhs))
9375 : {
9376 609 : case COMPONENT_REF:
9377 609 : {
9378 609 : tree member = TREE_OPERAND (rhs, 1);
9379 :
9380 609 : member = instantiate_type (lhstype, member, complain);
9381 609 : if (member != error_mark_node
9382 609 : && TREE_SIDE_EFFECTS (TREE_OPERAND (rhs, 0)))
9383 : /* Do not lose object's side effects. */
9384 27 : return build2 (COMPOUND_EXPR, TREE_TYPE (member),
9385 54 : TREE_OPERAND (rhs, 0), member);
9386 : return member;
9387 : }
9388 :
9389 2032 : case OFFSET_REF:
9390 2032 : rhs = TREE_OPERAND (rhs, 1);
9391 2032 : if (BASELINK_P (rhs))
9392 : return instantiate_type (lhstype, rhs, complain_in);
9393 :
9394 : /* This can happen if we are forming a pointer-to-member for a
9395 : member template. */
9396 0 : gcc_assert (TREE_CODE (rhs) == TEMPLATE_ID_EXPR);
9397 :
9398 : /* Fall through. */
9399 :
9400 23932 : case TEMPLATE_ID_EXPR:
9401 23932 : {
9402 23932 : tree fns = TREE_OPERAND (rhs, 0);
9403 23932 : tree args = TREE_OPERAND (rhs, 1);
9404 :
9405 23932 : return
9406 23932 : resolve_address_of_overloaded_function (lhstype, fns, complain_in,
9407 : /*template_only=*/true,
9408 23932 : args, access_path);
9409 : }
9410 :
9411 649461 : case OVERLOAD:
9412 649461 : case FUNCTION_DECL:
9413 649461 : return
9414 649461 : resolve_address_of_overloaded_function (lhstype, rhs, complain_in,
9415 : /*template_only=*/false,
9416 : /*explicit_targs=*/NULL_TREE,
9417 649461 : access_path);
9418 :
9419 7050 : case ADDR_EXPR:
9420 7050 : {
9421 7050 : if (PTRMEM_OK_P (rhs))
9422 2032 : complain |= tf_ptrmem_ok;
9423 :
9424 7050 : return instantiate_type (lhstype, TREE_OPERAND (rhs, 0), complain);
9425 : }
9426 :
9427 0 : case ERROR_MARK:
9428 0 : return error_mark_node;
9429 :
9430 0 : default:
9431 0 : gcc_unreachable ();
9432 : }
9433 : return error_mark_node;
9434 : }
9435 :
9436 : /* Return the name of the virtual function pointer field
9437 : (as an IDENTIFIER_NODE) for the given TYPE. Note that
9438 : this may have to look back through base types to find the
9439 : ultimate field name. (For single inheritance, these could
9440 : all be the same name. Who knows for multiple inheritance). */
9441 :
9442 : static tree
9443 244842 : get_vfield_name (tree type)
9444 : {
9445 244842 : tree binfo, base_binfo;
9446 :
9447 244842 : for (binfo = TYPE_BINFO (type);
9448 244842 : BINFO_N_BASE_BINFOS (binfo);
9449 : binfo = base_binfo)
9450 : {
9451 71102 : base_binfo = BINFO_BASE_BINFO (binfo, 0);
9452 :
9453 142204 : if (BINFO_VIRTUAL_P (base_binfo)
9454 71102 : || !TYPE_CONTAINS_VPTR_P (BINFO_TYPE (base_binfo)))
9455 : break;
9456 : }
9457 :
9458 244842 : type = BINFO_TYPE (binfo);
9459 244842 : tree ctor_name = constructor_name (type);
9460 244842 : char *buf = (char *) alloca (sizeof (VFIELD_NAME_FORMAT)
9461 : + IDENTIFIER_LENGTH (ctor_name) + 2);
9462 244842 : sprintf (buf, VFIELD_NAME_FORMAT, IDENTIFIER_POINTER (ctor_name));
9463 244842 : return get_identifier (buf);
9464 : }
9465 :
9466 : /* Build a dummy reference to ourselves so Derived::Base (and A::A) works,
9467 : according to [class]:
9468 : The class-name is also inserted
9469 : into the scope of the class itself. For purposes of access checking,
9470 : the inserted class name is treated as if it were a public member name. */
9471 :
9472 : void
9473 29351022 : build_self_reference (void)
9474 : {
9475 29351022 : tree name = DECL_NAME (TYPE_NAME (current_class_type));
9476 29351022 : tree decl = build_lang_decl (TYPE_DECL, name, current_class_type);
9477 :
9478 29351022 : DECL_NONLOCAL (decl) = 1;
9479 29351022 : DECL_CONTEXT (decl) = current_class_type;
9480 29351022 : DECL_ARTIFICIAL (decl) = 1;
9481 29351022 : SET_DECL_SELF_REFERENCE_P (decl);
9482 29351022 : set_underlying_type (decl);
9483 29351022 : set_instantiating_module (decl);
9484 :
9485 29351022 : if (processing_template_decl)
9486 18691780 : decl = push_template_decl (decl);
9487 :
9488 29351022 : tree saved_cas = current_access_specifier;
9489 29351022 : current_access_specifier = access_public_node;
9490 29351022 : finish_member_declaration (decl);
9491 29351022 : current_access_specifier = saved_cas;
9492 29351022 : }
9493 :
9494 : /* Returns 1 if TYPE contains only padding bytes. */
9495 :
9496 : int
9497 587023819 : is_empty_class (tree type)
9498 : {
9499 587023819 : if (type == error_mark_node)
9500 : return 0;
9501 :
9502 587023816 : if (! CLASS_TYPE_P (type))
9503 : return 0;
9504 :
9505 355537413 : return CLASSTYPE_EMPTY_P (type);
9506 : }
9507 :
9508 : /* Returns true if TYPE contains no actual data, just various
9509 : possible combinations of empty classes. If IGNORE_VPTR is true,
9510 : a vptr doesn't prevent the class from being considered empty. Typically
9511 : we want to ignore the vptr on assignment, and not on initialization. */
9512 :
9513 : bool
9514 372938701 : is_really_empty_class (tree type, bool ignore_vptr)
9515 : {
9516 372938701 : if (CLASS_TYPE_P (type))
9517 : {
9518 30453883 : tree field;
9519 30453883 : tree binfo;
9520 30453883 : tree base_binfo;
9521 30453883 : int i;
9522 :
9523 : /* CLASSTYPE_EMPTY_P isn't set properly until the class is actually laid
9524 : out, but we'd like to be able to check this before then. */
9525 30453883 : if (COMPLETE_TYPE_P (type) && is_empty_class (type))
9526 : return true;
9527 :
9528 23406568 : if (!ignore_vptr && TYPE_CONTAINS_VPTR_P (type))
9529 : return false;
9530 :
9531 25710884 : for (binfo = TYPE_BINFO (type), i = 0;
9532 25710884 : BINFO_BASE_ITERATE (binfo, i, base_binfo); ++i)
9533 3721650 : if (!is_really_empty_class (BINFO_TYPE (base_binfo), ignore_vptr))
9534 : return false;
9535 408455526 : for (field = TYPE_FIELDS (type); field; field = DECL_CHAIN (field))
9536 407988559 : if (TREE_CODE (field) == FIELD_DECL
9537 23764702 : && !DECL_ARTIFICIAL (field)
9538 : /* An unnamed bit-field is not a data member. */
9539 21645854 : && !DECL_UNNAMED_BIT_FIELD (field)
9540 429632075 : && !is_really_empty_class (TREE_TYPE (field), ignore_vptr))
9541 : return false;
9542 : return true;
9543 : }
9544 342484818 : else if (TREE_CODE (type) == ARRAY_TYPE)
9545 1345707 : return (integer_zerop (array_type_nelts_top (type))
9546 1345707 : || is_really_empty_class (TREE_TYPE (type), ignore_vptr));
9547 : return false;
9548 : }
9549 :
9550 : /* Note that NAME was looked up while the current class was being
9551 : defined and that the result of that lookup was DECL. */
9552 :
9553 : void
9554 2111396328 : maybe_note_name_used_in_class (tree name, tree decl)
9555 : {
9556 : /* If we're not defining a class, there's nothing to do. */
9557 2111396328 : if (!(innermost_scope_kind() == sk_class
9558 288072989 : && TYPE_BEING_DEFINED (current_class_type)
9559 512298141 : && !LAMBDA_TYPE_P (current_class_type)))
9560 : return;
9561 :
9562 257031845 : const cp_binding_level *blev = nullptr;
9563 257031845 : if (const cxx_binding *binding = IDENTIFIER_BINDING (name))
9564 212916414 : blev = binding->scope;
9565 257031845 : const cp_binding_level *lev = current_binding_level;
9566 :
9567 : /* Record the binding in the names_used tables for classes inside blev. */
9568 383026980 : for (int i = current_class_depth; i > 0; --i)
9569 : {
9570 546149836 : tree type = (i == current_class_depth
9571 273074918 : ? current_class_type
9572 16043073 : : current_class_stack[i].type);
9573 :
9574 295362156 : for (; lev; lev = lev->level_chain)
9575 : {
9576 295362156 : if (lev == blev)
9577 : /* We found the declaration. */
9578 : return;
9579 148282373 : if (lev->kind == sk_class && lev->this_entity == type)
9580 : /* This class is inside the declaration scope. */
9581 : break;
9582 : }
9583 :
9584 125995135 : auto &names_used = current_class_stack[i-1].names_used;
9585 125995135 : if (!names_used)
9586 16393019 : names_used = splay_tree_new (splay_tree_compare_pointers, 0, 0);
9587 :
9588 125995135 : tree use = build1_loc (input_location, VIEW_CONVERT_EXPR,
9589 125995135 : TREE_TYPE (decl), decl);
9590 125995135 : EXPR_LOCATION_WRAPPER_P (use) = 1;
9591 125995135 : splay_tree_insert (names_used,
9592 : (splay_tree_key) name,
9593 : (splay_tree_value) use);
9594 : }
9595 : }
9596 :
9597 : /* Note that NAME was declared (as DECL) in the current class. Check
9598 : to see that the declaration is valid under [class.member.lookup]:
9599 :
9600 : If [the result of a search in T for N at point P] differs from the result of
9601 : a search in T for N from immediately after the class-specifier of T, the
9602 : program is ill-formed, no diagnostic required. */
9603 :
9604 : void
9605 319412499 : note_name_declared_in_class (tree name, tree decl)
9606 : {
9607 319412499 : splay_tree names_used;
9608 319412499 : splay_tree_node n;
9609 :
9610 : /* Look to see if we ever used this name. */
9611 319412499 : names_used
9612 319412499 : = current_class_stack[current_class_depth - 1].names_used;
9613 319412499 : if (!names_used)
9614 : return;
9615 : /* The C language allows members to be declared with a type of the same
9616 : name, and the C++ standard says this diagnostic is not required. So
9617 : allow it in extern "C" blocks unless pedantic is specified.
9618 : Allow it in all cases if -ms-extensions is specified. */
9619 98725820 : if ((!pedantic && current_lang_name == lang_name_c)
9620 96667430 : || flag_ms_extensions)
9621 : return;
9622 96667424 : n = splay_tree_lookup (names_used, (splay_tree_key) name);
9623 96667424 : if (n)
9624 : {
9625 60 : tree use = (tree) n->value;
9626 60 : location_t loc = EXPR_LOCATION (use);
9627 60 : tree olddecl = OVL_FIRST (TREE_OPERAND (use, 0));
9628 : /* [basic.scope.class]
9629 :
9630 : A name N used in a class S shall refer to the same declaration
9631 : in its context and when re-evaluated in the completed scope of
9632 : S. */
9633 60 : auto ov = make_temp_override (global_dc->m_pedantic_errors);
9634 60 : if (TREE_CODE (decl) == TYPE_DECL
9635 21 : && TREE_CODE (olddecl) == TYPE_DECL
9636 81 : && same_type_p (TREE_TYPE (decl), TREE_TYPE (olddecl)))
9637 : /* Different declaration, but same meaning; just warn. */;
9638 54 : else if (flag_permissive)
9639 : /* Let -fpermissive make it a warning like past versions. */;
9640 : else
9641 : /* Make it an error. */
9642 33 : global_dc->m_pedantic_errors = 1;
9643 :
9644 60 : auto_diagnostic_group d;
9645 120 : if (pedwarn (location_of (decl), OPT_Wchanges_meaning,
9646 : "declaration of %q#D changes meaning of %qD",
9647 60 : decl, OVL_NAME (decl)))
9648 : {
9649 51 : inform (loc, "used here to mean %q#D", olddecl);
9650 51 : inform (location_of (olddecl), "declared here" );
9651 : }
9652 60 : }
9653 : }
9654 :
9655 : /* Returns the VAR_DECL for the complete vtable associated with BINFO.
9656 : Secondary vtables are merged with primary vtables; this function
9657 : will return the VAR_DECL for the primary vtable. */
9658 :
9659 : tree
9660 5985636 : get_vtbl_decl_for_binfo (tree binfo)
9661 : {
9662 5985636 : tree decl;
9663 :
9664 5985636 : decl = BINFO_VTABLE (binfo);
9665 5985636 : if (decl && TREE_CODE (decl) == POINTER_PLUS_EXPR)
9666 : {
9667 5985633 : gcc_assert (TREE_CODE (TREE_OPERAND (decl, 0)) == ADDR_EXPR);
9668 5985633 : decl = TREE_OPERAND (TREE_OPERAND (decl, 0), 0);
9669 : }
9670 5985633 : if (decl)
9671 5985633 : gcc_assert (VAR_P (decl));
9672 5985636 : return decl;
9673 : }
9674 :
9675 :
9676 : /* Returns the binfo for the primary base of BINFO. If the resulting
9677 : BINFO is a virtual base, and it is inherited elsewhere in the
9678 : hierarchy, then the returned binfo might not be the primary base of
9679 : BINFO in the complete object. Check BINFO_PRIMARY_P or
9680 : BINFO_LOST_PRIMARY_P to be sure. */
9681 :
9682 : static tree
9683 44022123 : get_primary_binfo (tree binfo)
9684 : {
9685 44022123 : tree primary_base;
9686 :
9687 44022123 : primary_base = CLASSTYPE_PRIMARY_BINFO (BINFO_TYPE (binfo));
9688 44022123 : if (!primary_base)
9689 : return NULL_TREE;
9690 :
9691 12631207 : return copied_binfo (primary_base, binfo);
9692 : }
9693 :
9694 : /* As above, but iterate until we reach the binfo that actually provides the
9695 : vptr for BINFO. */
9696 :
9697 : static tree
9698 2545035 : most_primary_binfo (tree binfo)
9699 : {
9700 2545035 : tree b = binfo;
9701 7994514 : while (CLASSTYPE_HAS_PRIMARY_BASE_P (BINFO_TYPE (b))
9702 10898958 : && !BINFO_LOST_PRIMARY_P (b))
9703 : {
9704 2904444 : tree primary_base = get_primary_binfo (b);
9705 2904444 : gcc_assert (BINFO_PRIMARY_P (primary_base)
9706 : && BINFO_INHERITANCE_CHAIN (primary_base) == b);
9707 : b = primary_base;
9708 : }
9709 2545035 : return b;
9710 : }
9711 :
9712 : /* Returns true if BINFO gets its vptr from a virtual base of the most derived
9713 : type. Note that the virtual inheritance might be above or below BINFO in
9714 : the hierarchy. */
9715 :
9716 : bool
9717 165 : vptr_via_virtual_p (tree binfo)
9718 : {
9719 165 : if (TYPE_P (binfo))
9720 0 : binfo = TYPE_BINFO (binfo);
9721 165 : tree primary = most_primary_binfo (binfo);
9722 : /* Don't limit binfo_via_virtual, we want to return true when BINFO itself is
9723 : a morally virtual base. */
9724 165 : tree virt = binfo_via_virtual (primary, NULL_TREE);
9725 165 : return virt != NULL_TREE;
9726 : }
9727 :
9728 : /* If INDENTED_P is zero, indent to INDENT. Return nonzero. */
9729 :
9730 : static int
9731 129 : maybe_indent_hierarchy (FILE * stream, int indent, int indented_p)
9732 : {
9733 0 : if (!indented_p)
9734 39 : fprintf (stream, "%*s", indent, "");
9735 129 : return 1;
9736 : }
9737 :
9738 : /* Dump the offsets of all the bases rooted at BINFO to STREAM.
9739 : INDENT should be zero when called from the top level; it is
9740 : incremented recursively. IGO indicates the next expected BINFO in
9741 : inheritance graph ordering. */
9742 :
9743 : static tree
9744 102 : dump_class_hierarchy_r (FILE *stream,
9745 : dump_flags_t flags,
9746 : tree binfo,
9747 : tree igo,
9748 : int indent)
9749 : {
9750 102 : int indented = 0;
9751 102 : tree base_binfo;
9752 102 : int i;
9753 :
9754 204 : fprintf (stream, "%s (0x" HOST_WIDE_INT_PRINT_HEX ") ",
9755 102 : type_as_string (BINFO_TYPE (binfo), TFF_PLAIN_IDENTIFIER),
9756 : (HOST_WIDE_INT) (uintptr_t) binfo);
9757 102 : if (binfo != igo)
9758 : {
9759 27 : fprintf (stream, "alternative-path\n");
9760 27 : return igo;
9761 : }
9762 75 : igo = TREE_CHAIN (binfo);
9763 :
9764 75 : fprintf (stream, HOST_WIDE_INT_PRINT_DEC,
9765 75 : tree_to_shwi (BINFO_OFFSET (binfo)));
9766 75 : if (is_empty_class (BINFO_TYPE (binfo)))
9767 18 : fprintf (stream, " empty");
9768 57 : else if (CLASSTYPE_NEARLY_EMPTY_P (BINFO_TYPE (binfo)))
9769 12 : fprintf (stream, " nearly-empty");
9770 75 : if (BINFO_VIRTUAL_P (binfo))
9771 27 : fprintf (stream, " virtual");
9772 75 : fprintf (stream, "\n");
9773 :
9774 75 : if (BINFO_PRIMARY_P (binfo))
9775 : {
9776 15 : indented = maybe_indent_hierarchy (stream, indent + 3, indented);
9777 30 : fprintf (stream, " primary-for %s (0x" HOST_WIDE_INT_PRINT_HEX ")",
9778 15 : type_as_string (BINFO_TYPE (BINFO_INHERITANCE_CHAIN (binfo)),
9779 : TFF_PLAIN_IDENTIFIER),
9780 15 : (HOST_WIDE_INT) (uintptr_t) BINFO_INHERITANCE_CHAIN (binfo));
9781 : }
9782 75 : if (BINFO_LOST_PRIMARY_P (binfo))
9783 : {
9784 9 : indented = maybe_indent_hierarchy (stream, indent + 3, indented);
9785 9 : fprintf (stream, " lost-primary");
9786 : }
9787 75 : if (indented)
9788 24 : fprintf (stream, "\n");
9789 :
9790 75 : if (!(flags & TDF_SLIM))
9791 : {
9792 75 : int indented = 0;
9793 :
9794 75 : if (BINFO_SUBVTT_INDEX (binfo))
9795 : {
9796 21 : indented = maybe_indent_hierarchy (stream, indent + 3, indented);
9797 42 : fprintf (stream, " subvttidx=%s",
9798 21 : expr_as_string (BINFO_SUBVTT_INDEX (binfo),
9799 : TFF_PLAIN_IDENTIFIER));
9800 : }
9801 75 : if (BINFO_VPTR_INDEX (binfo))
9802 : {
9803 30 : indented = maybe_indent_hierarchy (stream, indent + 3, indented);
9804 60 : fprintf (stream, " vptridx=%s",
9805 30 : expr_as_string (BINFO_VPTR_INDEX (binfo),
9806 : TFF_PLAIN_IDENTIFIER));
9807 : }
9808 75 : if (BINFO_VPTR_FIELD (binfo))
9809 : {
9810 27 : indented = maybe_indent_hierarchy (stream, indent + 3, indented);
9811 54 : fprintf (stream, " vbaseoffset=%s",
9812 27 : expr_as_string (BINFO_VPTR_FIELD (binfo),
9813 : TFF_PLAIN_IDENTIFIER));
9814 : }
9815 75 : if (BINFO_VTABLE (binfo))
9816 : {
9817 27 : indented = maybe_indent_hierarchy (stream, indent + 3, indented);
9818 27 : fprintf (stream, " vptr=%s",
9819 27 : expr_as_string (BINFO_VTABLE (binfo),
9820 : TFF_PLAIN_IDENTIFIER));
9821 : }
9822 :
9823 75 : if (indented)
9824 51 : fprintf (stream, "\n");
9825 : }
9826 :
9827 153 : for (i = 0; BINFO_BASE_ITERATE (binfo, i, base_binfo); i++)
9828 78 : igo = dump_class_hierarchy_r (stream, flags, base_binfo, igo, indent + 2);
9829 :
9830 : return igo;
9831 : }
9832 :
9833 : /* Dump the BINFO hierarchy for T. */
9834 :
9835 : static void
9836 24 : dump_class_hierarchy_1 (FILE *stream, dump_flags_t flags, tree t)
9837 : {
9838 24 : fprintf (stream, "Class %s\n", type_as_string (t, TFF_PLAIN_IDENTIFIER));
9839 96 : fprintf (stream, " size=" HOST_WIDE_INT_PRINT_UNSIGNED " align=%u\n",
9840 24 : tree_to_shwi (TYPE_SIZE (t)) / BITS_PER_UNIT,
9841 24 : TYPE_ALIGN (t) / BITS_PER_UNIT);
9842 24 : if (tree as_base = CLASSTYPE_AS_BASE (t))
9843 96 : fprintf (stream, " base size=" HOST_WIDE_INT_PRINT_UNSIGNED
9844 : " base align=%u\n",
9845 24 : tree_to_shwi (TYPE_SIZE (as_base)) / BITS_PER_UNIT,
9846 24 : TYPE_ALIGN (as_base) / BITS_PER_UNIT);
9847 24 : dump_class_hierarchy_r (stream, flags, TYPE_BINFO (t), TYPE_BINFO (t), 0);
9848 24 : fprintf (stream, "\n");
9849 24 : }
9850 :
9851 : /* Debug interface to hierarchy dumping. */
9852 :
9853 : void
9854 0 : debug_class (tree t)
9855 : {
9856 0 : dump_class_hierarchy_1 (stderr, TDF_SLIM, t);
9857 0 : }
9858 :
9859 : static void
9860 49090220 : dump_class_hierarchy (tree t)
9861 : {
9862 49090220 : dump_flags_t flags;
9863 49090220 : if (FILE *stream = dump_begin (class_dump_id, &flags))
9864 : {
9865 24 : dump_class_hierarchy_1 (stream, flags, t);
9866 24 : dump_end (class_dump_id, stream);
9867 : }
9868 49090220 : }
9869 :
9870 : static void
9871 51 : dump_array (FILE * stream, tree decl)
9872 : {
9873 51 : tree value;
9874 51 : unsigned HOST_WIDE_INT ix;
9875 51 : HOST_WIDE_INT elt;
9876 51 : tree size = TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (decl)));
9877 :
9878 51 : elt = (tree_to_shwi (TYPE_SIZE (TREE_TYPE (TREE_TYPE (decl))))
9879 : / BITS_PER_UNIT);
9880 51 : fprintf (stream, "%s:", decl_as_string (decl, TFF_PLAIN_IDENTIFIER));
9881 51 : fprintf (stream, " %s entries",
9882 : expr_as_string (size_binop (PLUS_EXPR, size, size_one_node),
9883 : TFF_PLAIN_IDENTIFIER));
9884 51 : fprintf (stream, "\n");
9885 :
9886 519 : FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (DECL_INITIAL (decl)),
9887 : ix, value)
9888 417 : fprintf (stream, "%-4ld %s\n", (long)(ix * elt),
9889 : expr_as_string (value, TFF_PLAIN_IDENTIFIER));
9890 51 : }
9891 :
9892 : static void
9893 1956637 : dump_vtable (tree t, tree binfo, tree vtable)
9894 : {
9895 1956637 : dump_flags_t flags;
9896 1956637 : FILE *stream = dump_begin (class_dump_id, &flags);
9897 :
9898 1956637 : if (!stream)
9899 1956598 : return;
9900 :
9901 39 : if (!(flags & TDF_SLIM))
9902 : {
9903 39 : int ctor_vtbl_p = TYPE_BINFO (t) != binfo;
9904 :
9905 96 : fprintf (stream, "%s for %s",
9906 : ctor_vtbl_p ? "Construction vtable" : "Vtable",
9907 39 : type_as_string (BINFO_TYPE (binfo), TFF_PLAIN_IDENTIFIER));
9908 39 : if (ctor_vtbl_p)
9909 : {
9910 21 : if (!BINFO_VIRTUAL_P (binfo))
9911 6 : fprintf (stream, " (0x" HOST_WIDE_INT_PRINT_HEX " instance)",
9912 : (HOST_WIDE_INT) (uintptr_t) binfo);
9913 21 : fprintf (stream, " in %s", type_as_string (t, TFF_PLAIN_IDENTIFIER));
9914 : }
9915 39 : fprintf (stream, "\n");
9916 39 : dump_array (stream, vtable);
9917 39 : fprintf (stream, "\n");
9918 : }
9919 :
9920 39 : dump_end (class_dump_id, stream);
9921 : }
9922 :
9923 : static void
9924 178266 : dump_vtt (tree t, tree vtt)
9925 : {
9926 178266 : dump_flags_t flags;
9927 178266 : FILE *stream = dump_begin (class_dump_id, &flags);
9928 :
9929 178266 : if (!stream)
9930 178254 : return;
9931 :
9932 12 : if (!(flags & TDF_SLIM))
9933 : {
9934 12 : fprintf (stream, "VTT for %s\n",
9935 : type_as_string (t, TFF_PLAIN_IDENTIFIER));
9936 12 : dump_array (stream, vtt);
9937 12 : fprintf (stream, "\n");
9938 : }
9939 :
9940 12 : dump_end (class_dump_id, stream);
9941 : }
9942 :
9943 : /* Dump a function or thunk and its thunkees. */
9944 :
9945 : static void
9946 0 : dump_thunk (FILE *stream, int indent, tree thunk)
9947 : {
9948 0 : static const char spaces[] = " ";
9949 0 : tree name = DECL_NAME (thunk);
9950 0 : tree thunks;
9951 :
9952 0 : fprintf (stream, "%.*s%p %s %s", indent, spaces,
9953 : (void *)thunk,
9954 0 : !DECL_THUNK_P (thunk) ? "function"
9955 0 : : DECL_THIS_THUNK_P (thunk) ? "this-thunk" : "covariant-thunk",
9956 0 : name ? IDENTIFIER_POINTER (name) : "<unset>");
9957 0 : if (DECL_THUNK_P (thunk))
9958 : {
9959 0 : HOST_WIDE_INT fixed_adjust = THUNK_FIXED_OFFSET (thunk);
9960 0 : tree virtual_adjust = THUNK_VIRTUAL_OFFSET (thunk);
9961 :
9962 0 : fprintf (stream, " fixed=" HOST_WIDE_INT_PRINT_DEC, fixed_adjust);
9963 0 : if (!virtual_adjust)
9964 : /*NOP*/;
9965 0 : else if (DECL_THIS_THUNK_P (thunk))
9966 0 : fprintf (stream, " vcall=" HOST_WIDE_INT_PRINT_DEC,
9967 : tree_to_shwi (virtual_adjust));
9968 : else
9969 0 : fprintf (stream, " vbase=" HOST_WIDE_INT_PRINT_DEC "(%s)",
9970 0 : tree_to_shwi (BINFO_VPTR_FIELD (virtual_adjust)),
9971 0 : type_as_string (BINFO_TYPE (virtual_adjust), TFF_SCOPE));
9972 0 : if (THUNK_ALIAS (thunk))
9973 0 : fprintf (stream, " alias to %p", (void *)THUNK_ALIAS (thunk));
9974 : }
9975 0 : fprintf (stream, "\n");
9976 0 : for (thunks = DECL_THUNKS (thunk); thunks; thunks = TREE_CHAIN (thunks))
9977 0 : dump_thunk (stream, indent + 2, thunks);
9978 0 : }
9979 :
9980 : /* Dump the thunks for FN. */
9981 :
9982 : void
9983 0 : debug_thunks (tree fn)
9984 : {
9985 0 : dump_thunk (stderr, 0, fn);
9986 0 : }
9987 :
9988 : /* Virtual function table initialization. */
9989 :
9990 : /* Create all the necessary vtables for T and its base classes. */
9991 :
9992 : static void
9993 49090220 : finish_vtbls (tree t)
9994 : {
9995 49090220 : tree vbase;
9996 49090220 : vec<constructor_elt, va_gc> *v = NULL;
9997 49090220 : tree vtable = BINFO_VTABLE (TYPE_BINFO (t));
9998 :
9999 : /* We lay out the primary and secondary vtables in one contiguous
10000 : vtable. The primary vtable is first, followed by the non-virtual
10001 : secondary vtables in inheritance graph order. */
10002 49090220 : accumulate_vtbl_inits (TYPE_BINFO (t), TYPE_BINFO (t), TYPE_BINFO (t),
10003 : vtable, t, &v);
10004 :
10005 : /* Then come the virtual bases, also in inheritance graph order. */
10006 125228539 : for (vbase = TYPE_BINFO (t); vbase; vbase = TREE_CHAIN (vbase))
10007 : {
10008 76138319 : if (!BINFO_VIRTUAL_P (vbase))
10009 75946299 : continue;
10010 192020 : accumulate_vtbl_inits (vbase, vbase, TYPE_BINFO (t), vtable, t, &v);
10011 : }
10012 :
10013 49090220 : if (BINFO_VTABLE (TYPE_BINFO (t)))
10014 1711593 : initialize_vtable (TYPE_BINFO (t), v);
10015 49090220 : }
10016 :
10017 : /* Initialize the vtable for BINFO with the INITS. */
10018 :
10019 : static void
10020 1711593 : initialize_vtable (tree binfo, vec<constructor_elt, va_gc> *inits)
10021 : {
10022 1711593 : tree decl;
10023 :
10024 3423186 : layout_vtable_decl (binfo, vec_safe_length (inits));
10025 1711593 : decl = get_vtbl_decl_for_binfo (binfo);
10026 1711593 : initialize_artificial_var (decl, inits);
10027 1711593 : dump_vtable (BINFO_TYPE (binfo), binfo, decl);
10028 1711593 : }
10029 :
10030 : /* Build the VTT (virtual table table) for T.
10031 : A class requires a VTT if it has virtual bases.
10032 :
10033 : This holds
10034 : 1 - primary virtual pointer for complete object T
10035 : 2 - secondary VTTs for each direct non-virtual base of T which requires a
10036 : VTT
10037 : 3 - secondary virtual pointers for each direct or indirect base of T which
10038 : has virtual bases or is reachable via a virtual path from T.
10039 : 4 - secondary VTTs for each direct or indirect virtual base of T.
10040 :
10041 : Secondary VTTs look like complete object VTTs without part 4. */
10042 :
10043 : static void
10044 49090220 : build_vtt (tree t)
10045 : {
10046 49090220 : tree type;
10047 49090220 : tree vtt;
10048 49090220 : tree index;
10049 49090220 : vec<constructor_elt, va_gc> *inits;
10050 :
10051 : /* Build up the initializers for the VTT. */
10052 49090220 : inits = NULL;
10053 49090220 : index = size_zero_node;
10054 49090220 : build_vtt_inits (TYPE_BINFO (t), t, &inits, &index);
10055 :
10056 : /* If we didn't need a VTT, we're done. */
10057 49090220 : if (!inits)
10058 48911954 : return;
10059 :
10060 : /* Figure out the type of the VTT. */
10061 356532 : type = build_array_of_n_type (const_ptr_type_node,
10062 178266 : inits->length ());
10063 :
10064 : /* Now, build the VTT object itself. */
10065 178266 : vtt = build_vtable (t, mangle_vtt_for_type (t), type);
10066 178266 : initialize_artificial_var (vtt, inits);
10067 : /* Add the VTT to the vtables list. */
10068 178266 : DECL_CHAIN (vtt) = DECL_CHAIN (CLASSTYPE_VTABLES (t));
10069 178266 : DECL_CHAIN (CLASSTYPE_VTABLES (t)) = vtt;
10070 :
10071 178266 : dump_vtt (t, vtt);
10072 : }
10073 :
10074 : /* When building a secondary VTT, BINFO_VTABLE is set to a TREE_LIST with
10075 : PURPOSE the RTTI_BINFO, VALUE the real vtable pointer for this binfo,
10076 : and CHAIN the vtable pointer for this binfo after construction is
10077 : complete. VALUE can also be another BINFO, in which case we recurse. */
10078 :
10079 : static tree
10080 1081799 : binfo_ctor_vtable (tree binfo)
10081 : {
10082 1153786 : tree vt;
10083 :
10084 1153786 : while (1)
10085 : {
10086 1153786 : vt = BINFO_VTABLE (binfo);
10087 1153786 : if (TREE_CODE (vt) == TREE_LIST)
10088 727581 : vt = TREE_VALUE (vt);
10089 1153786 : if (TREE_CODE (vt) == TREE_BINFO)
10090 : binfo = vt;
10091 : else
10092 : break;
10093 : }
10094 :
10095 1081799 : return vt;
10096 : }
10097 :
10098 : /* Data for secondary VTT initialization. */
10099 : struct secondary_vptr_vtt_init_data
10100 : {
10101 : /* Is this the primary VTT? */
10102 : bool top_level_p;
10103 :
10104 : /* Current index into the VTT. */
10105 : tree index;
10106 :
10107 : /* Vector of initializers built up. */
10108 : vec<constructor_elt, va_gc> *inits;
10109 :
10110 : /* The type being constructed by this secondary VTT. */
10111 : tree type_being_constructed;
10112 : };
10113 :
10114 : /* Recursively build the VTT-initializer for BINFO (which is in the
10115 : hierarchy dominated by T). INITS points to the end of the initializer
10116 : list to date. INDEX is the VTT index where the next element will be
10117 : replaced. Iff BINFO is the binfo for T, this is the top level VTT (i.e.
10118 : not a subvtt for some base of T). When that is so, we emit the sub-VTTs
10119 : for virtual bases of T. When it is not so, we build the constructor
10120 : vtables for the BINFO-in-T variant. */
10121 :
10122 : static void
10123 49515806 : build_vtt_inits (tree binfo, tree t, vec<constructor_elt, va_gc> **inits,
10124 : tree *index)
10125 : {
10126 49515806 : int i;
10127 49515806 : tree b;
10128 49515806 : tree init;
10129 49515806 : secondary_vptr_vtt_init_data data;
10130 49515806 : int top_level_p = SAME_BINFO_TYPE_P (BINFO_TYPE (binfo), t);
10131 :
10132 : /* We only need VTTs for subobjects with virtual bases. */
10133 49515806 : if (!CLASSTYPE_VBASECLASSES (BINFO_TYPE (binfo)))
10134 49092496 : return;
10135 :
10136 : /* We need to use a construction vtable if this is not the primary
10137 : VTT. */
10138 423310 : if (!top_level_p)
10139 : {
10140 245044 : build_ctor_vtbl_group (binfo, t);
10141 :
10142 : /* Record the offset in the VTT where this sub-VTT can be found. */
10143 245044 : BINFO_SUBVTT_INDEX (binfo) = *index;
10144 : }
10145 :
10146 : /* Add the address of the primary vtable for the complete object. */
10147 423310 : init = binfo_ctor_vtable (binfo);
10148 423310 : CONSTRUCTOR_APPEND_ELT (*inits, NULL_TREE, init);
10149 423310 : if (top_level_p)
10150 : {
10151 178266 : gcc_assert (!BINFO_VPTR_INDEX (binfo));
10152 178266 : BINFO_VPTR_INDEX (binfo) = *index;
10153 : }
10154 423310 : *index = size_binop (PLUS_EXPR, *index, TYPE_SIZE_UNIT (ptr_type_node));
10155 :
10156 : /* Recursively add the secondary VTTs for non-virtual bases. */
10157 916555 : for (i = 0; BINFO_BASE_ITERATE (binfo, i, b); ++i)
10158 493245 : if (!BINFO_VIRTUAL_P (b))
10159 233566 : build_vtt_inits (b, t, inits, index);
10160 :
10161 : /* Add secondary virtual pointers for all subobjects of BINFO with
10162 : either virtual bases or reachable along a virtual path, except
10163 : subobjects that are non-virtual primary bases. */
10164 423310 : data.top_level_p = top_level_p;
10165 423310 : data.index = *index;
10166 423310 : data.inits = *inits;
10167 423310 : data.type_being_constructed = BINFO_TYPE (binfo);
10168 :
10169 423310 : dfs_walk_once (binfo, dfs_build_secondary_vptr_vtt_inits, NULL, &data);
10170 :
10171 423310 : *index = data.index;
10172 :
10173 : /* data.inits might have grown as we added secondary virtual pointers.
10174 : Make sure our caller knows about the new vector. */
10175 423310 : *inits = data.inits;
10176 :
10177 423310 : if (top_level_p)
10178 : /* Add the secondary VTTs for virtual bases in inheritance graph
10179 : order. */
10180 957135 : for (b = TYPE_BINFO (BINFO_TYPE (binfo)); b; b = TREE_CHAIN (b))
10181 : {
10182 778869 : if (!BINFO_VIRTUAL_P (b))
10183 586849 : continue;
10184 :
10185 192020 : build_vtt_inits (b, t, inits, index);
10186 : }
10187 : else
10188 : /* Remove the ctor vtables we created. */
10189 245044 : dfs_walk_all (binfo, dfs_fixup_binfo_vtbls, NULL, binfo);
10190 : }
10191 :
10192 : /* Called from build_vtt_inits via dfs_walk. BINFO is the binfo for the base
10193 : in most derived. DATA is a SECONDARY_VPTR_VTT_INIT_DATA structure. */
10194 :
10195 : static tree
10196 1726479 : dfs_build_secondary_vptr_vtt_inits (tree binfo, void *data_)
10197 : {
10198 1726479 : secondary_vptr_vtt_init_data *data = (secondary_vptr_vtt_init_data *)data_;
10199 :
10200 : /* We don't care about bases that don't have vtables. */
10201 1726479 : if (!TYPE_VFIELD (BINFO_TYPE (binfo)))
10202 : return dfs_skip_bases;
10203 :
10204 : /* We're only interested in proper subobjects of the type being
10205 : constructed. */
10206 1702802 : if (SAME_BINFO_TYPE_P (BINFO_TYPE (binfo), data->type_being_constructed))
10207 : return NULL_TREE;
10208 :
10209 : /* We're only interested in bases with virtual bases or reachable
10210 : via a virtual path from the type being constructed. */
10211 2087832 : if (!(CLASSTYPE_VBASECLASSES (BINFO_TYPE (binfo))
10212 808340 : || binfo_via_virtual (binfo, data->type_being_constructed)))
10213 : return dfs_skip_bases;
10214 :
10215 : /* We're not interested in non-virtual primary bases. */
10216 1278966 : if (!BINFO_VIRTUAL_P (binfo) && BINFO_PRIMARY_P (binfo))
10217 : return NULL_TREE;
10218 :
10219 : /* Record the index where this secondary vptr can be found. */
10220 658489 : if (data->top_level_p)
10221 : {
10222 247939 : gcc_assert (!BINFO_VPTR_INDEX (binfo));
10223 247939 : BINFO_VPTR_INDEX (binfo) = data->index;
10224 :
10225 247939 : if (BINFO_VIRTUAL_P (binfo))
10226 : {
10227 : /* It's a primary virtual base, and this is not a
10228 : construction vtable. Find the base this is primary of in
10229 : the inheritance graph, and use that base's vtable
10230 : now. */
10231 198518 : while (BINFO_PRIMARY_P (binfo))
10232 9494 : binfo = BINFO_INHERITANCE_CHAIN (binfo);
10233 : }
10234 : }
10235 :
10236 : /* Add the initializer for the secondary vptr itself. */
10237 658489 : CONSTRUCTOR_APPEND_ELT (data->inits, NULL_TREE, binfo_ctor_vtable (binfo));
10238 :
10239 : /* Advance the vtt index. */
10240 658489 : data->index = size_binop (PLUS_EXPR, data->index,
10241 : TYPE_SIZE_UNIT (ptr_type_node));
10242 :
10243 658489 : return NULL_TREE;
10244 : }
10245 :
10246 : /* Called from build_vtt_inits via dfs_walk. After building
10247 : constructor vtables and generating the sub-vtt from them, we need
10248 : to restore the BINFO_VTABLES that were scribbled on. DATA is the
10249 : binfo of the base whose sub vtt was generated. */
10250 :
10251 : static tree
10252 1104042 : dfs_fixup_binfo_vtbls (tree binfo, void* data)
10253 : {
10254 1104042 : tree vtable = BINFO_VTABLE (binfo);
10255 :
10256 1104042 : if (!TYPE_CONTAINS_VPTR_P (BINFO_TYPE (binfo)))
10257 : /* If this class has no vtable, none of its bases do. */
10258 : return dfs_skip_bases;
10259 :
10260 1008722 : if (!vtable)
10261 : /* This might be a primary base, so have no vtable in this
10262 : hierarchy. */
10263 : return NULL_TREE;
10264 :
10265 : /* If we scribbled the construction vtable vptr into BINFO, clear it
10266 : out now. */
10267 694565 : if (TREE_CODE (vtable) == TREE_LIST
10268 694565 : && (TREE_PURPOSE (vtable) == (tree) data))
10269 655594 : BINFO_VTABLE (binfo) = TREE_CHAIN (vtable);
10270 :
10271 : return NULL_TREE;
10272 : }
10273 :
10274 : /* Build the construction vtable group for BINFO which is in the
10275 : hierarchy dominated by T. */
10276 :
10277 : static void
10278 245044 : build_ctor_vtbl_group (tree binfo, tree t)
10279 : {
10280 245044 : tree type;
10281 245044 : tree vtbl;
10282 245044 : tree id;
10283 245044 : tree vbase;
10284 245044 : vec<constructor_elt, va_gc> *v;
10285 :
10286 : /* See if we've already created this construction vtable group. */
10287 245044 : id = mangle_ctor_vtbl_for_type (t, binfo);
10288 245044 : if (get_global_binding (id))
10289 0 : return;
10290 :
10291 245044 : gcc_assert (!SAME_BINFO_TYPE_P (BINFO_TYPE (binfo), t));
10292 : /* Build a version of VTBL (with the wrong type) for use in
10293 : constructing the addresses of secondary vtables in the
10294 : construction vtable group. */
10295 245044 : vtbl = build_vtable (t, id, ptr_type_node);
10296 :
10297 : /* Don't export construction vtables from shared libraries. Even on
10298 : targets that don't support hidden visibility, this tells
10299 : can_refer_decl_in_current_unit_p not to assume that it's safe to
10300 : access from a different compilation unit (bz 54314). */
10301 245044 : DECL_VISIBILITY (vtbl) = VISIBILITY_HIDDEN;
10302 245044 : DECL_VISIBILITY_SPECIFIED (vtbl) = true;
10303 :
10304 245044 : v = NULL;
10305 245044 : accumulate_vtbl_inits (binfo, TYPE_BINFO (TREE_TYPE (binfo)),
10306 : binfo, vtbl, t, &v);
10307 :
10308 : /* Add the vtables for each of our virtual bases using the vbase in T
10309 : binfo. */
10310 245044 : for (vbase = TYPE_BINFO (BINFO_TYPE (binfo));
10311 1196675 : vbase;
10312 951631 : vbase = TREE_CHAIN (vbase))
10313 : {
10314 951631 : tree b;
10315 :
10316 951631 : if (!BINFO_VIRTUAL_P (vbase))
10317 564181 : continue;
10318 387450 : b = copied_binfo (vbase, binfo);
10319 :
10320 387450 : accumulate_vtbl_inits (b, vbase, binfo, vtbl, t, &v);
10321 : }
10322 :
10323 : /* Figure out the type of the construction vtable. */
10324 245044 : type = build_array_of_n_type (vtable_entry_type, v->length ());
10325 245044 : layout_type (type);
10326 245044 : TREE_TYPE (vtbl) = type;
10327 245044 : DECL_SIZE (vtbl) = DECL_SIZE_UNIT (vtbl) = NULL_TREE;
10328 245044 : layout_decl (vtbl, 0);
10329 :
10330 : /* Initialize the construction vtable. */
10331 245044 : CLASSTYPE_VTABLES (t) = chainon (CLASSTYPE_VTABLES (t), vtbl);
10332 245044 : initialize_artificial_var (vtbl, v);
10333 245044 : dump_vtable (t, binfo, vtbl);
10334 : }
10335 :
10336 : /* Add the vtbl initializers for BINFO (and its bases other than
10337 : non-virtual primaries) to the list of INITS. BINFO is in the
10338 : hierarchy dominated by T. RTTI_BINFO is the binfo within T of
10339 : the constructor the vtbl inits should be accumulated for. (If this
10340 : is the complete object vtbl then RTTI_BINFO will be TYPE_BINFO (T).)
10341 : ORIG_BINFO is the binfo for this object within BINFO_TYPE (RTTI_BINFO).
10342 : BINFO is the active base equivalent of ORIG_BINFO in the inheritance
10343 : graph of T. Both BINFO and ORIG_BINFO will have the same BINFO_TYPE,
10344 : but are not necessarily the same in terms of layout. */
10345 :
10346 : static void
10347 53427927 : accumulate_vtbl_inits (tree binfo,
10348 : tree orig_binfo,
10349 : tree rtti_binfo,
10350 : tree vtbl,
10351 : tree t,
10352 : vec<constructor_elt, va_gc> **inits)
10353 : {
10354 53427927 : int i;
10355 53427927 : tree base_binfo;
10356 53427927 : int ctor_vtbl_p = !SAME_BINFO_TYPE_P (BINFO_TYPE (rtti_binfo), t);
10357 :
10358 53427927 : gcc_assert (SAME_BINFO_TYPE_P (BINFO_TYPE (binfo), BINFO_TYPE (orig_binfo)));
10359 :
10360 : /* If it doesn't have a vptr, we don't do anything. */
10361 53427927 : if (!TYPE_CONTAINS_VPTR_P (BINFO_TYPE (binfo)))
10362 : return;
10363 :
10364 : /* If we're building a construction vtable, we're not interested in
10365 : subobjects that don't require construction vtables. */
10366 5440089 : if (ctor_vtbl_p
10367 930023 : && !CLASSTYPE_VBASECLASSES (BINFO_TYPE (binfo))
10368 5898960 : && !binfo_via_virtual (orig_binfo, BINFO_TYPE (rtti_binfo)))
10369 : return;
10370 :
10371 : /* Build the initializers for the BINFO-in-T vtable. */
10372 5439888 : dfs_accumulate_vtbl_inits (binfo, orig_binfo, rtti_binfo, vtbl, t, inits);
10373 :
10374 : /* Walk the BINFO and its bases. We walk in preorder so that as we
10375 : initialize each vtable we can figure out at what offset the
10376 : secondary vtable lies from the primary vtable. We can't use
10377 : dfs_walk here because we need to iterate through bases of BINFO
10378 : and RTTI_BINFO simultaneously. */
10379 15152437 : for (i = 0; BINFO_BASE_ITERATE (binfo, i, base_binfo); ++i)
10380 : {
10381 : /* Skip virtual bases. */
10382 4272661 : if (BINFO_VIRTUAL_P (base_binfo))
10383 759468 : continue;
10384 7026386 : accumulate_vtbl_inits (base_binfo,
10385 3513193 : BINFO_BASE_BINFO (orig_binfo, i),
10386 : rtti_binfo, vtbl, t,
10387 : inits);
10388 : }
10389 : }
10390 :
10391 : /* Called from accumulate_vtbl_inits. Adds the initializers for the
10392 : BINFO vtable to L. */
10393 :
10394 : static void
10395 5439888 : dfs_accumulate_vtbl_inits (tree binfo,
10396 : tree orig_binfo,
10397 : tree rtti_binfo,
10398 : tree orig_vtbl,
10399 : tree t,
10400 : vec<constructor_elt, va_gc> **l)
10401 : {
10402 5439888 : tree vtbl = NULL_TREE;
10403 5439888 : int ctor_vtbl_p = !SAME_BINFO_TYPE_P (BINFO_TYPE (rtti_binfo), t);
10404 5439888 : int n_inits;
10405 :
10406 5439888 : if (ctor_vtbl_p
10407 6369710 : && BINFO_VIRTUAL_P (orig_binfo) && BINFO_PRIMARY_P (orig_binfo))
10408 : {
10409 : /* In the hierarchy of BINFO_TYPE (RTTI_BINFO), this is a
10410 : primary virtual base. If it is not the same primary in
10411 : the hierarchy of T, we'll need to generate a ctor vtable
10412 : for it, to place at its location in T. If it is the same
10413 : primary, we still need a VTT entry for the vtable, but it
10414 : should point to the ctor vtable for the base it is a
10415 : primary for within the sub-hierarchy of RTTI_BINFO.
10416 :
10417 : There are three possible cases:
10418 :
10419 : 1) We are in the same place.
10420 : 2) We are a primary base within a lost primary virtual base of
10421 : RTTI_BINFO.
10422 : 3) We are primary to something not a base of RTTI_BINFO. */
10423 :
10424 : tree b;
10425 : tree last = NULL_TREE;
10426 :
10427 : /* First, look through the bases we are primary to for RTTI_BINFO
10428 : or a virtual base. */
10429 : b = binfo;
10430 73444 : while (BINFO_PRIMARY_P (b))
10431 : {
10432 73028 : b = BINFO_INHERITANCE_CHAIN (b);
10433 73028 : last = b;
10434 144989 : if (BINFO_VIRTUAL_P (b) || b == rtti_binfo)
10435 71961 : goto found;
10436 : }
10437 : /* If we run out of primary links, keep looking down our
10438 : inheritance chain; we might be an indirect primary. */
10439 865 : for (b = last; b; b = BINFO_INHERITANCE_CHAIN (b))
10440 461 : if (BINFO_VIRTUAL_P (b) || b == rtti_binfo)
10441 : break;
10442 404 : found:
10443 :
10444 : /* If we found RTTI_BINFO, this is case 1. If we found a virtual
10445 : base B and it is a base of RTTI_BINFO, this is case 2. In
10446 : either case, we share our vtable with LAST, i.e. the
10447 : derived-most base within B of which we are a primary. */
10448 72377 : if (b == rtti_binfo
10449 72377 : || (b && binfo_for_vbase (BINFO_TYPE (b), BINFO_TYPE (rtti_binfo))))
10450 : /* Just set our BINFO_VTABLE to point to LAST, as we may not have
10451 : set LAST's BINFO_VTABLE yet. We'll extract the actual vptr in
10452 : binfo_ctor_vtable after everything's been set up. */
10453 : vtbl = last;
10454 :
10455 : /* Otherwise, this is case 3 and we get our own. */
10456 : }
10457 5367511 : else if (!BINFO_NEW_VTABLE_MARKED (orig_binfo))
10458 : return;
10459 :
10460 2616323 : n_inits = vec_safe_length (*l);
10461 :
10462 2616323 : if (!vtbl)
10463 : {
10464 2544870 : tree index;
10465 2544870 : int non_fn_entries;
10466 :
10467 : /* Add the initializer for this vtable. */
10468 2544870 : build_vtbl_initializer (binfo, orig_binfo, t, rtti_binfo,
10469 : &non_fn_entries, l);
10470 :
10471 : /* Figure out the position to which the VPTR should point. */
10472 2544870 : vtbl = build1 (ADDR_EXPR, vtbl_ptr_type_node, orig_vtbl);
10473 2544870 : index = size_binop (MULT_EXPR,
10474 : TYPE_SIZE_UNIT (vtable_entry_type),
10475 : size_int (non_fn_entries + n_inits));
10476 2544870 : vtbl = fold_build_pointer_plus (vtbl, index);
10477 : }
10478 :
10479 2616323 : if (ctor_vtbl_p)
10480 : /* For a construction vtable, we can't overwrite BINFO_VTABLE.
10481 : So, we make a TREE_LIST. Later, dfs_fixup_binfo_vtbls will
10482 : straighten this out. */
10483 655594 : BINFO_VTABLE (binfo) = tree_cons (rtti_binfo, vtbl, BINFO_VTABLE (binfo));
10484 1960729 : else if (BINFO_PRIMARY_P (binfo) && BINFO_VIRTUAL_P (binfo))
10485 : /* Throw away any unneeded intializers. */
10486 8067 : (*l)->truncate (n_inits);
10487 : else
10488 : /* For an ordinary vtable, set BINFO_VTABLE. */
10489 1952662 : BINFO_VTABLE (binfo) = vtbl;
10490 : }
10491 :
10492 : static GTY(()) tree abort_fndecl_addr;
10493 : static GTY(()) tree dvirt_fn;
10494 :
10495 : /* Construct the initializer for BINFO's virtual function table. BINFO
10496 : is part of the hierarchy dominated by T. If we're building a
10497 : construction vtable, the ORIG_BINFO is the binfo we should use to
10498 : find the actual function pointers to put in the vtable - but they
10499 : can be overridden on the path to most-derived in the graph that
10500 : ORIG_BINFO belongs. Otherwise,
10501 : ORIG_BINFO should be the same as BINFO. The RTTI_BINFO is the
10502 : BINFO that should be indicated by the RTTI information in the
10503 : vtable; it will be a base class of T, rather than T itself, if we
10504 : are building a construction vtable.
10505 :
10506 : The value returned is a TREE_LIST suitable for wrapping in a
10507 : CONSTRUCTOR to use as the DECL_INITIAL for a vtable. If
10508 : NON_FN_ENTRIES_P is not NULL, *NON_FN_ENTRIES_P is set to the
10509 : number of non-function entries in the vtable.
10510 :
10511 : It might seem that this function should never be called with a
10512 : BINFO for which BINFO_PRIMARY_P holds, the vtable for such a
10513 : base is always subsumed by a derived class vtable. However, when
10514 : we are building construction vtables, we do build vtables for
10515 : primary bases; we need these while the primary base is being
10516 : constructed. */
10517 :
10518 : static void
10519 2544870 : build_vtbl_initializer (tree binfo,
10520 : tree orig_binfo,
10521 : tree t,
10522 : tree rtti_binfo,
10523 : int* non_fn_entries_p,
10524 : vec<constructor_elt, va_gc> **inits)
10525 : {
10526 2544870 : tree v;
10527 2544870 : vtbl_init_data vid;
10528 2544870 : unsigned ix, jx;
10529 2544870 : tree vbinfo;
10530 2544870 : vec<tree, va_gc> *vbases;
10531 2544870 : constructor_elt *e;
10532 :
10533 : /* Initialize VID. */
10534 2544870 : memset (&vid, 0, sizeof (vid));
10535 2544870 : vid.binfo = binfo;
10536 2544870 : vid.derived = t;
10537 2544870 : vid.rtti_binfo = rtti_binfo;
10538 2544870 : vid.primary_vtbl_p = SAME_BINFO_TYPE_P (BINFO_TYPE (binfo), t);
10539 2544870 : vid.ctor_vtbl_p = !SAME_BINFO_TYPE_P (BINFO_TYPE (rtti_binfo), t);
10540 2544870 : vid.generate_vcall_entries = true;
10541 : /* The first vbase or vcall offset is at index -3 in the vtable. */
10542 2544870 : vid.index = ssize_int(-3 * TARGET_VTABLE_DATA_ENTRY_DISTANCE);
10543 :
10544 : /* Add entries to the vtable for RTTI. */
10545 2544870 : build_rtti_vtbl_entries (binfo, &vid);
10546 :
10547 : /* Create an array for keeping track of the functions we've
10548 : processed. When we see multiple functions with the same
10549 : signature, we share the vcall offsets. */
10550 2544870 : vec_alloc (vid.fns, 32);
10551 : /* Add the vcall and vbase offset entries. */
10552 2544870 : build_vcall_and_vbase_vtbl_entries (binfo, &vid);
10553 :
10554 : /* Clear BINFO_VTABLE_PATH_MARKED; it's set by
10555 : build_vbase_offset_vtbl_entries. */
10556 2544870 : for (vbases = CLASSTYPE_VBASECLASSES (t), ix = 0;
10557 8903020 : vec_safe_iterate (vbases, ix, &vbinfo); ix++)
10558 6358150 : BINFO_VTABLE_PATH_MARKED (vbinfo) = 0;
10559 :
10560 : /* If the target requires padding between data entries, add that now. */
10561 2544870 : if (TARGET_VTABLE_DATA_ENTRY_DISTANCE > 1)
10562 : {
10563 : int n_entries = vec_safe_length (vid.inits);
10564 :
10565 : vec_safe_grow (vid.inits, TARGET_VTABLE_DATA_ENTRY_DISTANCE * n_entries,
10566 : true);
10567 :
10568 : /* Move data entries into their new positions and add padding
10569 : after the new positions. Iterate backwards so we don't
10570 : overwrite entries that we would need to process later. */
10571 : for (ix = n_entries - 1;
10572 : vid.inits->iterate (ix, &e);
10573 : ix--)
10574 : {
10575 : int j;
10576 : int new_position = (TARGET_VTABLE_DATA_ENTRY_DISTANCE * ix
10577 : + (TARGET_VTABLE_DATA_ENTRY_DISTANCE - 1));
10578 :
10579 : (*vid.inits)[new_position] = *e;
10580 :
10581 : for (j = 1; j < TARGET_VTABLE_DATA_ENTRY_DISTANCE; ++j)
10582 : {
10583 : constructor_elt *f = &(*vid.inits)[new_position - j];
10584 : f->index = NULL_TREE;
10585 : f->value = build1 (NOP_EXPR, vtable_entry_type,
10586 : null_pointer_node);
10587 : }
10588 : }
10589 : }
10590 :
10591 2544870 : if (non_fn_entries_p)
10592 5089740 : *non_fn_entries_p = vec_safe_length (vid.inits);
10593 :
10594 : /* The initializers for virtual functions were built up in reverse
10595 : order. Straighten them out and add them to the running list in one
10596 : step. */
10597 2544870 : jx = vec_safe_length (*inits);
10598 2544870 : vec_safe_grow (*inits, jx + vid.inits->length (), true);
10599 :
10600 2544870 : for (ix = vid.inits->length () - 1;
10601 10237074 : vid.inits->iterate (ix, &e);
10602 7692204 : ix--, jx++)
10603 7692204 : (**inits)[jx] = *e;
10604 :
10605 : /* Go through all the ordinary virtual functions, building up
10606 : initializers. */
10607 13864549 : for (v = BINFO_VIRTUALS (orig_binfo); v; v = TREE_CHAIN (v))
10608 : {
10609 11319679 : tree delta;
10610 11319679 : tree vcall_index;
10611 11319679 : tree fn, fn_original;
10612 11319679 : tree init = NULL_TREE;
10613 :
10614 11319679 : fn = BV_FN (v);
10615 11319679 : fn_original = fn;
10616 11319679 : if (DECL_THUNK_P (fn))
10617 : {
10618 476 : if (!DECL_NAME (fn))
10619 214 : finish_thunk (fn);
10620 476 : if (THUNK_ALIAS (fn))
10621 : {
10622 0 : fn = THUNK_ALIAS (fn);
10623 0 : BV_FN (v) = fn;
10624 : }
10625 476 : fn_original = THUNK_TARGET (fn);
10626 : }
10627 :
10628 : /* If the only definition of this function signature along our
10629 : primary base chain is from a lost primary, this vtable slot will
10630 : never be used, so just zero it out. This is important to avoid
10631 : requiring extra thunks which cannot be generated with the function.
10632 :
10633 : We first check this in update_vtable_entry_for_fn, so we handle
10634 : restored primary bases properly; we also need to do it here so we
10635 : zero out unused slots in ctor vtables, rather than filling them
10636 : with erroneous values (though harmless, apart from relocation
10637 : costs). */
10638 11319679 : if (BV_LOST_PRIMARY (v))
10639 745 : init = size_zero_node;
10640 :
10641 745 : if (! init)
10642 : {
10643 : /* Pull the offset for `this', and the function to call, out of
10644 : the list. */
10645 11318934 : delta = BV_DELTA (v);
10646 11318934 : vcall_index = BV_VCALL_INDEX (v);
10647 :
10648 11318934 : gcc_assert (TREE_CODE (delta) == INTEGER_CST);
10649 11318934 : gcc_assert (TREE_CODE (fn) == FUNCTION_DECL);
10650 :
10651 : /* You can't call an abstract virtual function; it's abstract.
10652 : So, we replace these functions with __pure_virtual. */
10653 11318934 : if (DECL_PURE_VIRTUAL_P (fn_original))
10654 : {
10655 744156 : fn = abort_fndecl;
10656 744156 : if (!TARGET_VTABLE_USES_DESCRIPTORS)
10657 : {
10658 744156 : if (abort_fndecl_addr == NULL)
10659 13460 : abort_fndecl_addr
10660 13460 : = fold_convert (vfunc_ptr_type_node,
10661 : build_fold_addr_expr (fn));
10662 744156 : init = abort_fndecl_addr;
10663 : }
10664 : }
10665 : /* Likewise for deleted virtuals. */
10666 10574778 : else if (DECL_DELETED_FN (fn_original))
10667 : {
10668 47 : if (!dvirt_fn)
10669 : {
10670 23 : tree name = get_identifier ("__cxa_deleted_virtual");
10671 23 : dvirt_fn = get_global_binding (name);
10672 23 : if (!dvirt_fn)
10673 23 : dvirt_fn = push_library_fn
10674 23 : (name,
10675 : build_function_type_list (void_type_node, NULL_TREE),
10676 : NULL_TREE, ECF_NORETURN | ECF_COLD);
10677 : }
10678 47 : fn = dvirt_fn;
10679 47 : if (!TARGET_VTABLE_USES_DESCRIPTORS)
10680 47 : init = fold_convert (vfunc_ptr_type_node,
10681 : build_fold_addr_expr (fn));
10682 : }
10683 : else
10684 : {
10685 10574731 : if (!integer_zerop (delta) || vcall_index)
10686 : {
10687 1000521 : fn = make_thunk (fn, /*this_adjusting=*/1,
10688 : delta, vcall_index);
10689 1000521 : if (!DECL_NAME (fn))
10690 466112 : finish_thunk (fn);
10691 : }
10692 : /* Take the address of the function, considering it to be of an
10693 : appropriate generic type. */
10694 10574731 : if (!TARGET_VTABLE_USES_DESCRIPTORS)
10695 10574731 : init = fold_convert (vfunc_ptr_type_node,
10696 : build_fold_addr_expr (fn));
10697 : /* Don't refer to a virtual destructor from a constructor
10698 : vtable or a vtable for an abstract class, since destroying
10699 : an object under construction is undefined behavior and we
10700 : don't want it to be considered a candidate for speculative
10701 : devirtualization. But do create the thunk for ABI
10702 : compliance. */
10703 10574731 : if (DECL_DESTRUCTOR_P (fn_original)
10704 10574731 : && (CLASSTYPE_PURE_VIRTUALS (DECL_CONTEXT (fn_original))
10705 4338990 : || orig_binfo != binfo))
10706 1293516 : init = size_zero_node;
10707 : }
10708 : }
10709 :
10710 : /* And add it to the chain of initializers. */
10711 11319679 : if (TARGET_VTABLE_USES_DESCRIPTORS)
10712 : {
10713 : int i;
10714 : if (init == size_zero_node)
10715 : for (i = 0; i < TARGET_VTABLE_USES_DESCRIPTORS; ++i)
10716 : CONSTRUCTOR_APPEND_ELT (*inits, NULL_TREE, init);
10717 : else
10718 : for (i = 0; i < TARGET_VTABLE_USES_DESCRIPTORS; ++i)
10719 : {
10720 : tree fdesc = build2 (FDESC_EXPR, vfunc_ptr_type_node,
10721 : fn, build_int_cst (NULL_TREE, i));
10722 : TREE_CONSTANT (fdesc) = 1;
10723 :
10724 : CONSTRUCTOR_APPEND_ELT (*inits, NULL_TREE, fdesc);
10725 : }
10726 : }
10727 : else
10728 11319679 : CONSTRUCTOR_APPEND_ELT (*inits, NULL_TREE, init);
10729 : }
10730 2544870 : }
10731 :
10732 : /* Adds to vid->inits the initializers for the vbase and vcall
10733 : offsets in BINFO, which is in the hierarchy dominated by T. */
10734 :
10735 : static void
10736 5452323 : build_vcall_and_vbase_vtbl_entries (tree binfo, vtbl_init_data* vid)
10737 : {
10738 5452323 : tree b;
10739 :
10740 : /* If this is a derived class, we must first create entries
10741 : corresponding to the primary base class. */
10742 5452323 : b = get_primary_binfo (binfo);
10743 5452323 : if (b)
10744 2907453 : build_vcall_and_vbase_vtbl_entries (b, vid);
10745 :
10746 : /* Add the vbase entries for this base. */
10747 5452323 : build_vbase_offset_vtbl_entries (binfo, vid);
10748 : /* Add the vcall entries for this base. */
10749 5452323 : build_vcall_offset_vtbl_entries (binfo, vid);
10750 5452323 : }
10751 :
10752 : /* Returns the initializers for the vbase offset entries in the vtable
10753 : for BINFO (which is part of the class hierarchy dominated by T), in
10754 : reverse order. VBASE_OFFSET_INDEX gives the vtable index
10755 : where the next vbase offset will go. */
10756 :
10757 : static void
10758 5452323 : build_vbase_offset_vtbl_entries (tree binfo, vtbl_init_data* vid)
10759 : {
10760 5452323 : tree vbase;
10761 5452323 : tree t;
10762 5452323 : tree non_primary_binfo;
10763 :
10764 : /* If there are no virtual baseclasses, then there is nothing to
10765 : do. */
10766 5452323 : if (!CLASSTYPE_VBASECLASSES (BINFO_TYPE (binfo)))
10767 : return;
10768 :
10769 903023 : t = vid->derived;
10770 :
10771 : /* We might be a primary base class. Go up the inheritance hierarchy
10772 : until we find the most derived class of which we are a primary base:
10773 : it is the offset of that which we need to use. */
10774 903023 : non_primary_binfo = binfo;
10775 1408933 : while (BINFO_INHERITANCE_CHAIN (non_primary_binfo))
10776 : {
10777 849847 : tree b;
10778 :
10779 : /* If we have reached a virtual base, then it must be a primary
10780 : base (possibly multi-level) of vid->binfo, or we wouldn't
10781 : have called build_vcall_and_vbase_vtbl_entries for it. But it
10782 : might be a lost primary, so just skip down to vid->binfo. */
10783 849847 : if (BINFO_VIRTUAL_P (non_primary_binfo))
10784 : {
10785 185278 : non_primary_binfo = vid->binfo;
10786 185278 : break;
10787 : }
10788 :
10789 664569 : b = BINFO_INHERITANCE_CHAIN (non_primary_binfo);
10790 664569 : if (get_primary_binfo (b) != non_primary_binfo)
10791 : break;
10792 : non_primary_binfo = b;
10793 : }
10794 :
10795 : /* Go through the virtual bases, adding the offsets. */
10796 903023 : for (vbase = TYPE_BINFO (BINFO_TYPE (binfo));
10797 5496876 : vbase;
10798 4593853 : vbase = TREE_CHAIN (vbase))
10799 : {
10800 4593853 : tree b;
10801 4593853 : tree delta;
10802 :
10803 4593853 : if (!BINFO_VIRTUAL_P (vbase))
10804 2107663 : continue;
10805 :
10806 : /* Find the instance of this virtual base in the complete
10807 : object. */
10808 2486190 : b = copied_binfo (vbase, binfo);
10809 :
10810 : /* If we've already got an offset for this virtual base, we
10811 : don't need another one. */
10812 2486190 : if (BINFO_VTABLE_PATH_MARKED (b))
10813 301276 : continue;
10814 2184914 : BINFO_VTABLE_PATH_MARKED (b) = 1;
10815 :
10816 : /* Figure out where we can find this vbase offset. */
10817 2184914 : delta = size_binop (MULT_EXPR,
10818 : vid->index,
10819 : fold_convert (ssizetype,
10820 : TYPE_SIZE_UNIT (vtable_entry_type)));
10821 2184914 : if (vid->primary_vtbl_p)
10822 192020 : BINFO_VPTR_FIELD (b) = delta;
10823 :
10824 2184914 : if (binfo != TYPE_BINFO (t))
10825 : /* The vbase offset had better be the same. */
10826 2128358 : gcc_assert (tree_int_cst_equal (delta, BINFO_VPTR_FIELD (vbase)));
10827 :
10828 : /* The next vbase will come at a more negative offset. */
10829 2184914 : vid->index = size_binop (MINUS_EXPR, vid->index,
10830 : ssize_int (TARGET_VTABLE_DATA_ENTRY_DISTANCE));
10831 :
10832 : /* The initializer is the delta from BINFO to this virtual base.
10833 : The vbase offsets go in reverse inheritance-graph order, and
10834 : we are walking in inheritance graph order so these end up in
10835 : the right order. */
10836 2184914 : delta = size_diffop_loc (input_location,
10837 2184914 : BINFO_OFFSET (b), BINFO_OFFSET (non_primary_binfo));
10838 :
10839 6778767 : CONSTRUCTOR_APPEND_ELT (vid->inits, NULL_TREE,
10840 : fold_build1_loc (input_location, NOP_EXPR,
10841 : vtable_entry_type, delta));
10842 : }
10843 : }
10844 :
10845 : /* Adds the initializers for the vcall offset entries in the vtable
10846 : for BINFO (which is part of the class hierarchy dominated by VID->DERIVED)
10847 : to VID->INITS. */
10848 :
10849 : static void
10850 5452323 : build_vcall_offset_vtbl_entries (tree binfo, vtbl_init_data* vid)
10851 : {
10852 : /* We only need these entries if this base is a virtual base. We
10853 : compute the indices -- but do not add to the vtable -- when
10854 : building the main vtable for a class. */
10855 5452323 : if (binfo == TYPE_BINFO (vid->derived)
10856 9193053 : || (BINFO_VIRTUAL_P (binfo)
10857 : /* If BINFO is RTTI_BINFO, then (since BINFO does not
10858 : correspond to VID->DERIVED), we are building a primary
10859 : construction virtual table. Since this is a primary
10860 : virtual table, we do not need the vcall offsets for
10861 : BINFO. */
10862 586475 : && binfo != vid->rtti_binfo))
10863 : {
10864 : /* We need a vcall offset for each of the virtual functions in this
10865 : vtable. For example:
10866 :
10867 : class A { virtual void f (); };
10868 : class B1 : virtual public A { virtual void f (); };
10869 : class B2 : virtual public A { virtual void f (); };
10870 : class C: public B1, public B2 { virtual void f (); };
10871 :
10872 : A C object has a primary base of B1, which has a primary base of A. A
10873 : C also has a secondary base of B2, which no longer has a primary base
10874 : of A. So the B2-in-C construction vtable needs a secondary vtable for
10875 : A, which will adjust the A* to a B2* to call f. We have no way of
10876 : knowing what (or even whether) this offset will be when we define B2,
10877 : so we store this "vcall offset" in the A sub-vtable and look it up in
10878 : a "virtual thunk" for B2::f.
10879 :
10880 : We need entries for all the functions in our primary vtable and
10881 : in our non-virtual bases' secondary vtables. */
10882 2284657 : vid->vbase = binfo;
10883 : /* If we are just computing the vcall indices -- but do not need
10884 : the actual entries -- not that. */
10885 2284657 : if (!BINFO_VIRTUAL_P (binfo))
10886 1711593 : vid->generate_vcall_entries = false;
10887 : /* Now, walk through the non-virtual bases, adding vcall offsets. */
10888 2284657 : add_vcall_offset_vtbl_entries_r (binfo, vid);
10889 : }
10890 5452323 : }
10891 :
10892 : /* Build vcall offsets, starting with those for BINFO. */
10893 :
10894 : static void
10895 6216678 : add_vcall_offset_vtbl_entries_r (tree binfo, vtbl_init_data* vid)
10896 : {
10897 6216678 : int i;
10898 6216678 : tree primary_binfo;
10899 6216678 : tree base_binfo;
10900 :
10901 : /* Don't walk into virtual bases -- except, of course, for the
10902 : virtual base for which we are building vcall offsets. Any
10903 : primary virtual base will have already had its offsets generated
10904 : through the recursion in build_vcall_and_vbase_vtbl_entries. */
10905 6216678 : if (BINFO_VIRTUAL_P (binfo) && vid->vbase != binfo)
10906 6216678 : return;
10907 :
10908 : /* If BINFO has a primary base, process it first. */
10909 5740128 : primary_binfo = get_primary_binfo (binfo);
10910 5740128 : if (primary_binfo)
10911 2859794 : add_vcall_offset_vtbl_entries_r (primary_binfo, vid);
10912 :
10913 : /* Add BINFO itself to the list. */
10914 5740128 : add_vcall_offset_vtbl_entries_1 (binfo, vid);
10915 :
10916 : /* Scan the non-primary bases of BINFO. */
10917 15412097 : for (i = 0; BINFO_BASE_ITERATE (binfo, i, base_binfo); ++i)
10918 3931841 : if (base_binfo != primary_binfo)
10919 1072227 : add_vcall_offset_vtbl_entries_r (base_binfo, vid);
10920 : }
10921 :
10922 : /* Called from build_vcall_offset_vtbl_entries_r. */
10923 :
10924 : static void
10925 5740128 : add_vcall_offset_vtbl_entries_1 (tree binfo, vtbl_init_data* vid)
10926 : {
10927 : /* Make entries for the rest of the virtuals. */
10928 5740128 : tree orig_fn;
10929 :
10930 : /* The ABI requires that the methods be processed in declaration
10931 : order. */
10932 5740128 : for (orig_fn = TYPE_FIELDS (BINFO_TYPE (binfo));
10933 196069528 : orig_fn;
10934 190329400 : orig_fn = DECL_CHAIN (orig_fn))
10935 190329400 : if (TREE_CODE (orig_fn) == FUNCTION_DECL && DECL_VINDEX (orig_fn))
10936 24573986 : add_vcall_offset (orig_fn, binfo, vid);
10937 5740128 : }
10938 :
10939 : /* Add a vcall offset entry for ORIG_FN to the vtable. */
10940 :
10941 : static void
10942 24573986 : add_vcall_offset (tree orig_fn, tree binfo, vtbl_init_data *vid)
10943 : {
10944 24573986 : size_t i;
10945 24573986 : tree vcall_offset;
10946 24573986 : tree derived_entry;
10947 :
10948 : /* If there is already an entry for a function with the same
10949 : signature as FN, then we do not need a second vcall offset.
10950 : Check the list of functions already present in the derived
10951 : class vtable. */
10952 67315552 : FOR_EACH_VEC_SAFE_ELT (vid->fns, i, derived_entry)
10953 : {
10954 58644244 : if (same_signature_p (derived_entry, orig_fn)
10955 : /* We only use one vcall offset for virtual destructors,
10956 : even though there are two virtual table entries. */
10957 110800458 : || (DECL_DESTRUCTOR_P (derived_entry)
10958 38417408 : && DECL_DESTRUCTOR_P (orig_fn)))
10959 24573986 : return;
10960 : }
10961 :
10962 : /* If we are building these vcall offsets as part of building
10963 : the vtable for the most derived class, remember the vcall
10964 : offset. */
10965 8671308 : if (vid->binfo == TYPE_BINFO (vid->derived))
10966 : {
10967 8255856 : tree_pair_s elt = {orig_fn, vid->index};
10968 8255856 : vec_safe_push (CLASSTYPE_VCALL_INDICES (vid->derived), elt);
10969 : }
10970 :
10971 : /* The next vcall offset will be found at a more negative
10972 : offset. */
10973 8671308 : vid->index = size_binop (MINUS_EXPR, vid->index,
10974 : ssize_int (TARGET_VTABLE_DATA_ENTRY_DISTANCE));
10975 :
10976 : /* Keep track of this function. */
10977 8671308 : vec_safe_push (vid->fns, orig_fn);
10978 :
10979 8671308 : if (vid->generate_vcall_entries)
10980 : {
10981 417550 : tree base;
10982 417550 : tree fn;
10983 :
10984 : /* Find the overriding function. */
10985 417550 : fn = find_final_overrider (vid->rtti_binfo, binfo, orig_fn);
10986 417550 : if (fn == error_mark_node)
10987 27 : vcall_offset = build_zero_cst (vtable_entry_type);
10988 : else
10989 : {
10990 417523 : base = TREE_VALUE (fn);
10991 :
10992 : /* The vbase we're working on is a primary base of
10993 : vid->binfo. But it might be a lost primary, so its
10994 : BINFO_OFFSET might be wrong, so we just use the
10995 : BINFO_OFFSET from vid->binfo. */
10996 1670092 : vcall_offset = size_diffop_loc (input_location,
10997 417523 : BINFO_OFFSET (base),
10998 417523 : BINFO_OFFSET (vid->binfo));
10999 417523 : vcall_offset = fold_build1_loc (input_location,
11000 : NOP_EXPR, vtable_entry_type,
11001 : vcall_offset);
11002 : }
11003 : /* Add the initializer to the vtable. */
11004 417550 : CONSTRUCTOR_APPEND_ELT (vid->inits, NULL_TREE, vcall_offset);
11005 : }
11006 : }
11007 :
11008 : /* Return vtbl initializers for the RTTI entries corresponding to the
11009 : BINFO's vtable. The RTTI entries should indicate the object given
11010 : by VID->rtti_binfo. */
11011 :
11012 : static void
11013 2544870 : build_rtti_vtbl_entries (tree binfo, vtbl_init_data* vid)
11014 : {
11015 2544870 : tree b;
11016 2544870 : tree t;
11017 2544870 : tree offset;
11018 2544870 : tree decl;
11019 2544870 : tree init;
11020 :
11021 2544870 : t = BINFO_TYPE (vid->rtti_binfo);
11022 :
11023 : /* To find the complete object, we will first convert to our most
11024 : primary base, and then add the offset in the vtbl to that value. */
11025 2544870 : b = most_primary_binfo (binfo);
11026 2544870 : offset = size_diffop_loc (input_location,
11027 2544870 : BINFO_OFFSET (vid->rtti_binfo), BINFO_OFFSET (b));
11028 :
11029 : /* The second entry is the address of the typeinfo object. */
11030 2544870 : if (flag_rtti)
11031 2541761 : decl = build_address (get_tinfo_decl (t));
11032 : else
11033 3109 : decl = integer_zero_node;
11034 :
11035 : /* Convert the declaration to a type that can be stored in the
11036 : vtable. */
11037 2544870 : init = build_nop (vfunc_ptr_type_node, decl);
11038 2544870 : CONSTRUCTOR_APPEND_ELT (vid->inits, NULL_TREE, init);
11039 :
11040 : /* Add the offset-to-top entry. It comes earlier in the vtable than
11041 : the typeinfo entry. Convert the offset to look like a
11042 : function pointer, so that we can put it in the vtable. */
11043 2544870 : init = build_nop (vfunc_ptr_type_node, offset);
11044 2544870 : CONSTRUCTOR_APPEND_ELT (vid->inits, NULL_TREE, init);
11045 2544870 : }
11046 :
11047 : /* TRUE iff TYPE is uniquely derived from PARENT. Ignores
11048 : accessibility. */
11049 :
11050 : bool
11051 2871 : uniquely_derived_from_p (tree parent, tree type)
11052 : {
11053 2871 : tree base = lookup_base (type, parent, ba_unique, NULL, tf_none);
11054 2871 : return base && base != error_mark_node;
11055 : }
11056 :
11057 : /* TRUE iff TYPE is publicly & uniquely derived from PARENT. */
11058 :
11059 : bool
11060 3742 : publicly_uniquely_derived_p (tree parent, tree type)
11061 : {
11062 3742 : tree base = lookup_base (type, parent, ba_ignore_scope | ba_check,
11063 : NULL, tf_none);
11064 3742 : return base && base != error_mark_node;
11065 : }
11066 :
11067 : /* TRUE iff TYPE is publicly & virtually derived from PARENT. */
11068 :
11069 : bool
11070 183953 : publicly_virtually_derived_p (tree parent, tree type)
11071 : {
11072 183953 : tree base = lookup_base (type, parent,
11073 : ba_ignore_scope | ba_check | ba_require_virtual,
11074 : NULL, tf_none);
11075 183953 : return base && base != error_mark_node;
11076 : }
11077 :
11078 : /* CTX1 and CTX2 are declaration contexts. Return the innermost common
11079 : class between them, if any. */
11080 :
11081 : tree
11082 9328 : common_enclosing_class (tree ctx1, tree ctx2)
11083 : {
11084 9328 : if (!TYPE_P (ctx1) || !TYPE_P (ctx2))
11085 : return NULL_TREE;
11086 9328 : gcc_assert (ctx1 == TYPE_MAIN_VARIANT (ctx1)
11087 : && ctx2 == TYPE_MAIN_VARIANT (ctx2));
11088 9328 : if (ctx1 == ctx2)
11089 : return ctx1;
11090 267 : for (tree t = ctx1; TYPE_P (t); t = TYPE_CONTEXT (t))
11091 195 : TYPE_MARKED_P (t) = true;
11092 129 : tree found = NULL_TREE;
11093 129 : for (tree t = ctx2; TYPE_P (t); t = TYPE_CONTEXT (t))
11094 129 : if (TYPE_MARKED_P (t))
11095 : {
11096 : found = t;
11097 : break;
11098 : }
11099 267 : for (tree t = ctx1; TYPE_P (t); t = TYPE_CONTEXT (t))
11100 195 : TYPE_MARKED_P (t) = false;
11101 : return found;
11102 : }
11103 :
11104 : #include "gt-cp-class.h"
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