Line data Source code
1 : /* Handle the hair of processing (but not expanding) inline functions.
2 : Also manage function and variable name overloading.
3 : Copyright (C) 1987-2026 Free Software Foundation, Inc.
4 : Contributed by Michael Tiemann (tiemann@cygnus.com)
5 :
6 : This file is part of GCC.
7 :
8 : GCC is free software; you can redistribute it and/or modify
9 : it under the terms of the GNU General Public License as published by
10 : the Free Software Foundation; either version 3, or (at your option)
11 : any later version.
12 :
13 : GCC is distributed in the hope that it will be useful,
14 : but WITHOUT ANY WARRANTY; without even the implied warranty of
15 : MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 : GNU General Public License for more details.
17 :
18 : You should have received a copy of the GNU General Public License
19 : along with GCC; see the file COPYING3. If not see
20 : <http://www.gnu.org/licenses/>. */
21 :
22 :
23 : /* Handle method declarations. */
24 : #include "config.h"
25 : #include "system.h"
26 : #include "coretypes.h"
27 : #include "target.h"
28 : #include "cp-tree.h"
29 : #include "decl.h"
30 : #include "stringpool.h"
31 : #include "cgraph.h"
32 : #include "varasm.h"
33 : #include "toplev.h"
34 : #include "intl.h"
35 : #include "common/common-target.h"
36 : #include "attribs.h"
37 :
38 : static void do_build_copy_assign (tree);
39 : static void do_build_copy_constructor (tree);
40 : static tree make_alias_for_thunk (tree);
41 :
42 : /* Called once to initialize method.cc. */
43 :
44 : void
45 98901 : init_method (void)
46 : {
47 98901 : init_mangle ();
48 98901 : }
49 :
50 : /* Return a this or result adjusting thunk to FUNCTION. THIS_ADJUSTING
51 : indicates whether it is a this or result adjusting thunk.
52 : FIXED_OFFSET and VIRTUAL_OFFSET indicate how to do the adjustment
53 : (see thunk_adjust). VIRTUAL_OFFSET can be NULL, but FIXED_OFFSET
54 : never is. VIRTUAL_OFFSET is the /index/ into the vtable for this
55 : adjusting thunks, we scale it to a byte offset. For covariant
56 : thunks VIRTUAL_OFFSET is the virtual binfo. You must post process
57 : the returned thunk with finish_thunk. */
58 :
59 : tree
60 1022063 : make_thunk (tree function, bool this_adjusting,
61 : tree fixed_offset, tree virtual_offset)
62 : {
63 1022063 : HOST_WIDE_INT d;
64 1022063 : tree thunk;
65 :
66 1022063 : gcc_assert (TREE_CODE (function) == FUNCTION_DECL);
67 : /* We can have this thunks to covariant thunks, but not vice versa. */
68 1022063 : gcc_assert (!DECL_THIS_THUNK_P (function));
69 1022063 : gcc_assert (!DECL_RESULT_THUNK_P (function) || this_adjusting);
70 :
71 : /* Scale the VIRTUAL_OFFSET to be in terms of bytes. */
72 1022063 : if (this_adjusting && virtual_offset)
73 825754 : virtual_offset
74 825754 : = size_binop (MULT_EXPR,
75 : virtual_offset,
76 : convert (ssizetype,
77 : TYPE_SIZE_UNIT (vtable_entry_type)));
78 :
79 1022063 : d = tree_to_shwi (fixed_offset);
80 :
81 : /* See if we already have the thunk in question. For this_adjusting
82 : thunks VIRTUAL_OFFSET will be an INTEGER_CST, for covariant thunks it
83 : will be a BINFO. */
84 2239484 : for (thunk = DECL_THUNKS (function); thunk; thunk = DECL_CHAIN (thunk))
85 740759 : if (DECL_THIS_THUNK_P (thunk) == this_adjusting
86 740756 : && THUNK_FIXED_OFFSET (thunk) == d
87 545859 : && !virtual_offset == !THUNK_VIRTUAL_OFFSET (thunk)
88 1286618 : && (!virtual_offset
89 469253 : || (this_adjusting
90 469253 : ? tree_int_cst_equal (THUNK_VIRTUAL_OFFSET (thunk),
91 : virtual_offset)
92 184 : : THUNK_VIRTUAL_OFFSET (thunk) == virtual_offset)))
93 545401 : return thunk;
94 :
95 : /* All thunks must be created before FUNCTION is actually emitted;
96 : the ABI requires that all thunks be emitted together with the
97 : function to which they transfer control. */
98 476662 : gcc_assert (!TREE_ASM_WRITTEN (function));
99 : /* Likewise, we can only be adding thunks to a function declared in
100 : the class currently being laid out. */
101 476662 : gcc_assert (TYPE_SIZE (DECL_CONTEXT (function))
102 : && TYPE_BEING_DEFINED (DECL_CONTEXT (function)));
103 :
104 476662 : thunk = build_decl (DECL_SOURCE_LOCATION (function),
105 476662 : FUNCTION_DECL, NULL_TREE, TREE_TYPE (function));
106 476662 : DECL_LANG_SPECIFIC (thunk) = DECL_LANG_SPECIFIC (function);
107 476662 : cxx_dup_lang_specific_decl (thunk);
108 476662 : DECL_VIRTUAL_P (thunk) = true;
109 476662 : SET_DECL_THUNKS (thunk, NULL_TREE);
110 :
111 476662 : DECL_CONTEXT (thunk) = DECL_CONTEXT (function);
112 476662 : TREE_READONLY (thunk) = TREE_READONLY (function);
113 476662 : TREE_THIS_VOLATILE (thunk) = TREE_THIS_VOLATILE (function);
114 476662 : TREE_PUBLIC (thunk) = TREE_PUBLIC (function);
115 476662 : SET_DECL_THUNK_P (thunk, this_adjusting);
116 476662 : THUNK_TARGET (thunk) = function;
117 476662 : THUNK_FIXED_OFFSET (thunk) = d;
118 476662 : THUNK_VIRTUAL_OFFSET (thunk) = virtual_offset;
119 476662 : THUNK_ALIAS (thunk) = NULL_TREE;
120 :
121 476662 : DECL_INTERFACE_KNOWN (thunk) = 1;
122 476662 : DECL_NOT_REALLY_EXTERN (thunk) = 1;
123 476662 : DECL_COMDAT (thunk) = DECL_COMDAT (function);
124 476662 : DECL_SAVED_AUTO_RETURN_TYPE (thunk) = NULL;
125 : /* The thunk itself is not a constructor or destructor, even if
126 : the thing it is thunking to is. */
127 476662 : DECL_CXX_DESTRUCTOR_P (thunk) = 0;
128 476662 : DECL_CXX_CONSTRUCTOR_P (thunk) = 0;
129 476662 : DECL_EXTERNAL (thunk) = 1;
130 476662 : DECL_ARTIFICIAL (thunk) = 1;
131 : /* The THUNK is not a pending inline, even if the FUNCTION is. */
132 476662 : DECL_PENDING_INLINE_P (thunk) = 0;
133 476662 : DECL_DECLARED_INLINE_P (thunk) = 0;
134 : /* Nor is it a template instantiation. */
135 476662 : DECL_USE_TEMPLATE (thunk) = 0;
136 476662 : DECL_TEMPLATE_INFO (thunk) = NULL;
137 :
138 : /* Add it to the list of thunks associated with FUNCTION. */
139 476662 : DECL_CHAIN (thunk) = DECL_THUNKS (function);
140 476662 : SET_DECL_THUNKS (function, thunk);
141 :
142 476662 : return thunk;
143 : }
144 :
145 : /* Finish THUNK, a thunk decl. */
146 :
147 : void
148 476662 : finish_thunk (tree thunk)
149 : {
150 476662 : tree function, name;
151 476662 : tree fixed_offset = ssize_int (THUNK_FIXED_OFFSET (thunk));
152 476662 : tree virtual_offset = THUNK_VIRTUAL_OFFSET (thunk);
153 :
154 476662 : gcc_assert (!DECL_NAME (thunk) && DECL_THUNK_P (thunk));
155 476662 : if (virtual_offset && DECL_RESULT_THUNK_P (thunk))
156 142 : virtual_offset = BINFO_VPTR_FIELD (virtual_offset);
157 476662 : function = THUNK_TARGET (thunk);
158 476876 : name = mangle_thunk (function, DECL_THIS_THUNK_P (thunk),
159 : fixed_offset, virtual_offset, thunk);
160 :
161 : /* We can end up with declarations of (logically) different
162 : covariant thunks, that do identical adjustments. The two thunks
163 : will be adjusting between within different hierarchies, which
164 : happen to have the same layout. We must nullify one of them to
165 : refer to the other. */
166 476662 : if (DECL_RESULT_THUNK_P (thunk))
167 : {
168 214 : tree cov_probe;
169 :
170 214 : for (cov_probe = DECL_THUNKS (function);
171 476 : cov_probe; cov_probe = DECL_CHAIN (cov_probe))
172 262 : if (DECL_NAME (cov_probe) == name)
173 : {
174 0 : gcc_assert (!DECL_THUNKS (thunk));
175 0 : THUNK_ALIAS (thunk) = (THUNK_ALIAS (cov_probe)
176 0 : ? THUNK_ALIAS (cov_probe) : cov_probe);
177 0 : break;
178 : }
179 : }
180 :
181 476662 : DECL_NAME (thunk) = name;
182 476662 : SET_DECL_ASSEMBLER_NAME (thunk, name);
183 476662 : }
184 :
185 : static GTY (()) int thunk_labelno;
186 :
187 : /* Create a static alias to target. */
188 :
189 : tree
190 32581 : make_alias_for (tree target, tree newid)
191 : {
192 32581 : tree alias = build_decl (DECL_SOURCE_LOCATION (target),
193 32581 : TREE_CODE (target), newid, TREE_TYPE (target));
194 32581 : DECL_LANG_SPECIFIC (alias) = DECL_LANG_SPECIFIC (target);
195 32581 : cxx_dup_lang_specific_decl (alias);
196 32581 : DECL_CONTEXT (alias) = DECL_CONTEXT (target);
197 32581 : TREE_READONLY (alias) = TREE_READONLY (target);
198 32581 : TREE_THIS_VOLATILE (alias) = TREE_THIS_VOLATILE (target);
199 32581 : TREE_PUBLIC (alias) = 0;
200 32581 : DECL_INTERFACE_KNOWN (alias) = 1;
201 32581 : if (DECL_LANG_SPECIFIC (alias))
202 : {
203 32581 : DECL_NOT_REALLY_EXTERN (alias) = 1;
204 32581 : DECL_USE_TEMPLATE (alias) = 0;
205 32581 : DECL_TEMPLATE_INFO (alias) = NULL;
206 : }
207 32581 : DECL_EXTERNAL (alias) = 0;
208 32581 : DECL_ARTIFICIAL (alias) = 1;
209 32581 : DECL_TEMPLATE_INSTANTIATED (alias) = 0;
210 32581 : if (TREE_CODE (alias) == FUNCTION_DECL)
211 : {
212 32521 : DECL_SAVED_AUTO_RETURN_TYPE (alias) = NULL;
213 32521 : DECL_CXX_DESTRUCTOR_P (alias) = 0;
214 32521 : DECL_CXX_CONSTRUCTOR_P (alias) = 0;
215 32521 : DECL_PENDING_INLINE_P (alias) = 0;
216 32521 : DECL_DECLARED_INLINE_P (alias) = 0;
217 32521 : DECL_INITIAL (alias) = error_mark_node;
218 32521 : DECL_ARGUMENTS (alias) = copy_list (DECL_ARGUMENTS (target));
219 : }
220 : else
221 60 : TREE_STATIC (alias) = 1;
222 32581 : TREE_ADDRESSABLE (alias) = 1;
223 32581 : TREE_USED (alias) = 1;
224 32581 : SET_DECL_ASSEMBLER_NAME (alias, DECL_NAME (alias));
225 32581 : return alias;
226 : }
227 :
228 : static tree
229 4349 : make_alias_for_thunk (tree function)
230 : {
231 4349 : tree alias;
232 4349 : char buf[256];
233 :
234 4349 : targetm.asm_out.generate_internal_label (buf, "LTHUNK", thunk_labelno);
235 4349 : thunk_labelno++;
236 :
237 4349 : alias = make_alias_for (function, get_identifier (buf));
238 :
239 4349 : if (!flag_syntax_only)
240 : {
241 4349 : struct cgraph_node *funcn, *aliasn;
242 4349 : funcn = cgraph_node::get (function);
243 4349 : gcc_checking_assert (funcn);
244 4349 : aliasn = cgraph_node::create_same_body_alias (alias, function);
245 4349 : DECL_ASSEMBLER_NAME (function);
246 4349 : gcc_assert (aliasn != NULL);
247 : }
248 :
249 4349 : return alias;
250 : }
251 :
252 : /* Emit the definition of a C++ multiple inheritance or covariant
253 : return vtable thunk. If EMIT_P is nonzero, the thunk is emitted
254 : immediately. */
255 :
256 : void
257 8392 : use_thunk (tree thunk_fndecl, bool emit_p)
258 : {
259 8392 : tree a, t, function, alias;
260 8392 : tree virtual_offset;
261 8392 : HOST_WIDE_INT fixed_offset, virtual_value;
262 8392 : bool this_adjusting = DECL_THIS_THUNK_P (thunk_fndecl);
263 8392 : struct cgraph_node *funcn, *thunk_node;
264 :
265 : /* We should have called finish_thunk to give it a name. */
266 8392 : gcc_assert (DECL_NAME (thunk_fndecl));
267 :
268 : /* We should never be using an alias, always refer to the
269 : aliased thunk. */
270 8392 : gcc_assert (!THUNK_ALIAS (thunk_fndecl));
271 :
272 8392 : if (TREE_ASM_WRITTEN (thunk_fndecl))
273 : return;
274 :
275 4454 : function = THUNK_TARGET (thunk_fndecl);
276 4454 : if (DECL_RESULT (thunk_fndecl))
277 : /* We already turned this thunk into an ordinary function.
278 : There's no need to process this thunk again. */
279 : return;
280 :
281 4454 : if (DECL_THUNK_P (function))
282 : /* The target is itself a thunk, process it now. */
283 152 : use_thunk (function, emit_p);
284 :
285 : /* Thunks are always addressable; they only appear in vtables. */
286 4454 : TREE_ADDRESSABLE (thunk_fndecl) = 1;
287 :
288 : /* Don't diagnose deprecated or unavailable functions just because they
289 : have thunks emitted for them. */
290 4454 : auto du = make_temp_override (deprecated_state,
291 4454 : UNAVAILABLE_DEPRECATED_SUPPRESS);
292 :
293 : /* Figure out what function is being thunked to. It's referenced in
294 : this translation unit. */
295 4454 : TREE_ADDRESSABLE (function) = 1;
296 4454 : mark_used (function);
297 4454 : if (!emit_p)
298 : return;
299 :
300 4349 : if (TARGET_USE_LOCAL_THUNK_ALIAS_P (function))
301 4349 : alias = make_alias_for_thunk (function);
302 : else
303 : alias = function;
304 :
305 4349 : fixed_offset = THUNK_FIXED_OFFSET (thunk_fndecl);
306 4349 : virtual_offset = THUNK_VIRTUAL_OFFSET (thunk_fndecl);
307 :
308 4349 : if (virtual_offset)
309 : {
310 2827 : if (!this_adjusting)
311 112 : virtual_offset = BINFO_VPTR_FIELD (virtual_offset);
312 2827 : virtual_value = tree_to_shwi (virtual_offset);
313 2827 : gcc_assert (virtual_value);
314 : }
315 : else
316 : virtual_value = 0;
317 :
318 : /* And, if we need to emit the thunk, it's used. */
319 4349 : mark_used (thunk_fndecl);
320 : /* This thunk is actually defined. */
321 4349 : DECL_EXTERNAL (thunk_fndecl) = 0;
322 : /* The linkage of the function may have changed. FIXME in linkage
323 : rewrite. */
324 4349 : gcc_assert (DECL_INTERFACE_KNOWN (function));
325 4349 : TREE_PUBLIC (thunk_fndecl) = TREE_PUBLIC (function);
326 4349 : DECL_VISIBILITY (thunk_fndecl) = DECL_VISIBILITY (function);
327 8698 : DECL_VISIBILITY_SPECIFIED (thunk_fndecl)
328 4349 : = DECL_VISIBILITY_SPECIFIED (function);
329 4349 : DECL_COMDAT (thunk_fndecl) = DECL_COMDAT (function);
330 4349 : DECL_WEAK (thunk_fndecl) = DECL_WEAK (function);
331 :
332 4349 : if (flag_syntax_only)
333 : {
334 0 : TREE_ASM_WRITTEN (thunk_fndecl) = 1;
335 0 : return;
336 : }
337 :
338 4349 : push_to_top_level ();
339 :
340 4349 : if (TARGET_USE_LOCAL_THUNK_ALIAS_P (function)
341 4349 : && targetm_common.have_named_sections)
342 : {
343 4349 : tree fn = function;
344 4349 : struct symtab_node *symbol;
345 :
346 4349 : if ((symbol = symtab_node::get (function))
347 4349 : && symbol->alias)
348 : {
349 256 : if (symbol->analyzed)
350 65 : fn = symtab_node::get (function)->ultimate_alias_target ()->decl;
351 : else
352 191 : fn = symtab_node::get (function)->alias_target;
353 : }
354 4349 : resolve_unique_section (fn, 0, flag_function_sections);
355 :
356 4349 : if (DECL_SECTION_NAME (fn) != NULL && DECL_ONE_ONLY (fn))
357 : {
358 3623 : resolve_unique_section (thunk_fndecl, 0, flag_function_sections);
359 :
360 : /* Output the thunk into the same section as function. */
361 3623 : set_decl_section_name (thunk_fndecl, fn);
362 7246 : symtab_node::get (thunk_fndecl)->implicit_section
363 3623 : = symtab_node::get (fn)->implicit_section;
364 : }
365 : }
366 :
367 : /* Set up cloned argument trees for the thunk. */
368 4349 : t = NULL_TREE;
369 9306 : for (a = DECL_ARGUMENTS (function); a; a = DECL_CHAIN (a))
370 : {
371 4957 : tree x = copy_node (a);
372 4957 : DECL_CHAIN (x) = t;
373 4957 : DECL_CONTEXT (x) = thunk_fndecl;
374 4957 : SET_DECL_RTL (x, NULL);
375 4957 : DECL_HAS_VALUE_EXPR_P (x) = 0;
376 4957 : TREE_ADDRESSABLE (x) = 0;
377 4957 : t = x;
378 : }
379 4349 : a = nreverse (t);
380 4349 : DECL_ARGUMENTS (thunk_fndecl) = a;
381 4349 : TREE_ASM_WRITTEN (thunk_fndecl) = 1;
382 4349 : funcn = cgraph_node::get (function);
383 4349 : gcc_checking_assert (funcn);
384 4349 : thunk_node = funcn->create_thunk (thunk_fndecl, function,
385 : this_adjusting, fixed_offset, virtual_value,
386 : 0, virtual_offset, alias);
387 4349 : if (DECL_ONE_ONLY (function))
388 3623 : thunk_node->add_to_same_comdat_group (funcn);
389 :
390 4349 : pop_from_top_level ();
391 4454 : }
392 :
393 : /* Code for synthesizing methods which have default semantics defined. */
394 :
395 : /* True iff CTYPE has a trivial SFK. */
396 :
397 : static bool
398 76595625 : type_has_trivial_fn (tree ctype, special_function_kind sfk)
399 : {
400 76595625 : switch (sfk)
401 : {
402 10722607 : case sfk_constructor:
403 10722607 : return !TYPE_HAS_COMPLEX_DFLT (ctype);
404 15090393 : case sfk_copy_constructor:
405 15090393 : return !TYPE_HAS_COMPLEX_COPY_CTOR (ctype);
406 11431077 : case sfk_move_constructor:
407 11431077 : return !TYPE_HAS_COMPLEX_MOVE_CTOR (ctype);
408 6364771 : case sfk_copy_assignment:
409 6364771 : return !TYPE_HAS_COMPLEX_COPY_ASSIGN (ctype);
410 5157210 : case sfk_move_assignment:
411 5157210 : return !TYPE_HAS_COMPLEX_MOVE_ASSIGN (ctype);
412 26950414 : case sfk_destructor:
413 26950414 : case sfk_virtual_destructor:
414 26950414 : return !TYPE_HAS_NONTRIVIAL_DESTRUCTOR (ctype);
415 : case sfk_inheriting_constructor:
416 : case sfk_comparison:
417 : return false;
418 0 : default:
419 0 : gcc_unreachable ();
420 : }
421 : }
422 :
423 : /* Note that CTYPE has a non-trivial SFK even though we previously thought
424 : it was trivial. */
425 :
426 : static void
427 250576 : type_set_nontrivial_flag (tree ctype, special_function_kind sfk)
428 : {
429 250576 : switch (sfk)
430 : {
431 147540 : case sfk_constructor:
432 147540 : TYPE_HAS_COMPLEX_DFLT (ctype) = true;
433 147540 : return;
434 3 : case sfk_copy_constructor:
435 3 : TYPE_HAS_COMPLEX_COPY_CTOR (ctype) = true;
436 3 : return;
437 102528 : case sfk_move_constructor:
438 102528 : TYPE_HAS_COMPLEX_MOVE_CTOR (ctype) = true;
439 102528 : return;
440 159 : case sfk_copy_assignment:
441 159 : TYPE_HAS_COMPLEX_COPY_ASSIGN (ctype) = true;
442 159 : return;
443 301 : case sfk_move_assignment:
444 301 : TYPE_HAS_COMPLEX_MOVE_ASSIGN (ctype) = true;
445 301 : return;
446 45 : case sfk_destructor:
447 45 : TYPE_HAS_NONTRIVIAL_DESTRUCTOR (ctype) = true;
448 45 : return;
449 0 : case sfk_inheriting_constructor:
450 0 : default:
451 0 : gcc_unreachable ();
452 : }
453 : }
454 :
455 : /* True iff FN is a trivial defaulted member function ([cd]tor, op=). */
456 :
457 : bool
458 341672532 : trivial_fn_p (tree fn)
459 : {
460 341672532 : if (TREE_CODE (fn) == TEMPLATE_DECL)
461 : return false;
462 341672532 : if (!DECL_DEFAULTED_FN (fn))
463 : return false;
464 :
465 : /* If fn is a clone, get the primary variant. */
466 36527973 : if (tree prim = DECL_CLONED_FUNCTION (fn))
467 28780455 : fn = prim;
468 36527973 : return type_has_trivial_fn (DECL_CONTEXT (fn), special_function_p (fn));
469 : }
470 :
471 : /* PARM is a PARM_DECL for a function which we want to forward to another
472 : function without changing its value category, a la std::forward. */
473 :
474 : tree
475 114699 : forward_parm (tree parm)
476 : {
477 114699 : tree exp = convert_from_reference (parm);
478 114699 : tree type = TREE_TYPE (parm);
479 114699 : if (DECL_PACK_P (parm))
480 626 : type = PACK_EXPANSION_PATTERN (type);
481 114699 : if (!TYPE_REF_P (type))
482 101277 : type = cp_build_reference_type (type, /*rval=*/true);
483 114699 : warning_sentinel w (warn_useless_cast);
484 114699 : exp = build_static_cast (input_location, type, exp,
485 : tf_warning_or_error);
486 114699 : if (DECL_PACK_P (parm))
487 626 : exp = make_pack_expansion (exp);
488 114699 : return exp;
489 114699 : }
490 :
491 : /* Strip all inheriting constructors, if any, to return the original
492 : constructor from a (possibly indirect) base class. */
493 :
494 : tree
495 1474150790 : strip_inheriting_ctors (tree dfn)
496 : {
497 1474150790 : if (!flag_new_inheriting_ctors)
498 : return dfn;
499 : tree fn = dfn;
500 2758279751 : while (tree inh = DECL_INHERITED_CTOR (fn))
501 1475561435 : fn = OVL_FIRST (inh);
502 :
503 1474063193 : if (TREE_CODE (fn) == TEMPLATE_DECL
504 731841864 : && TREE_CODE (dfn) == FUNCTION_DECL)
505 17562 : fn = DECL_TEMPLATE_RESULT (fn);
506 : return fn;
507 : }
508 :
509 : /* Find the binfo for the base subobject of BINFO being initialized by
510 : inherited constructor FNDECL (a member of a direct base of BINFO). */
511 :
512 : static tree inherited_ctor_binfo (tree, tree);
513 : static tree
514 76292 : inherited_ctor_binfo_1 (tree binfo, tree fndecl)
515 : {
516 76292 : tree base = DECL_CONTEXT (fndecl);
517 76292 : tree base_binfo;
518 76782 : for (int i = 0; BINFO_BASE_ITERATE (binfo, i, base_binfo); i++)
519 76782 : if (BINFO_TYPE (base_binfo) == base)
520 76292 : return inherited_ctor_binfo (base_binfo, fndecl);
521 :
522 0 : gcc_unreachable();
523 : }
524 :
525 : /* Find the binfo for the base subobject of BINFO being initialized by
526 : inheriting constructor FNDECL (a member of BINFO), or BINFO if FNDECL is not
527 : an inheriting constructor. */
528 :
529 : static tree
530 144419 : inherited_ctor_binfo (tree binfo, tree fndecl)
531 : {
532 288838 : tree inh = DECL_INHERITED_CTOR (fndecl);
533 144419 : if (!inh)
534 : return binfo;
535 :
536 76067 : tree results = NULL_TREE;
537 152584 : for (ovl_iterator iter (inh); iter; ++iter)
538 : {
539 76292 : tree one = inherited_ctor_binfo_1 (binfo, *iter);
540 76292 : if (!results)
541 : results = one;
542 225 : else if (one != results)
543 6 : results = tree_cons (NULL_TREE, one, results);
544 : }
545 76067 : return results;
546 : }
547 :
548 : /* Find the binfo for the base subobject being initialized by inheriting
549 : constructor FNDECL, or NULL_TREE if FNDECL is not an inheriting
550 : constructor. */
551 :
552 : tree
553 5438365 : inherited_ctor_binfo (tree fndecl)
554 : {
555 10876730 : if (!DECL_INHERITED_CTOR (fndecl))
556 : return NULL_TREE;
557 68127 : tree binfo = TYPE_BINFO (DECL_CONTEXT (fndecl));
558 68127 : return inherited_ctor_binfo (binfo, fndecl);
559 : }
560 :
561 :
562 : /* True if we should omit all user-declared parameters from a base
563 : constructor built from complete constructor FN.
564 : That's when the ctor is inherited from a virtual base. */
565 :
566 : bool
567 202197415 : base_ctor_omit_inherited_parms (tree comp_ctor)
568 : {
569 202197415 : gcc_checking_assert (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (comp_ctor));
570 :
571 202197415 : if (!flag_new_inheriting_ctors)
572 : /* We only optimize away the parameters in the new model. */
573 : return false;
574 :
575 202149713 : if (!CLASSTYPE_VBASECLASSES (DECL_CONTEXT (comp_ctor)))
576 : return false;
577 :
578 6356824 : if (FUNCTION_FIRST_USER_PARMTYPE (comp_ctor) == void_list_node)
579 : /* No user-declared parameters to omit. */
580 : return false;
581 :
582 5371960 : for (tree binfo = inherited_ctor_binfo (comp_ctor);
583 5373490 : binfo;
584 1530 : binfo = BINFO_INHERITANCE_CHAIN (binfo))
585 2856 : if (BINFO_VIRTUAL_P (binfo))
586 : return true;
587 :
588 : return false;
589 : }
590 :
591 :
592 : /* True if we should omit all user-declared parameters from constructor FN,
593 : because it is a base clone of a ctor inherited from a virtual base. */
594 :
595 : bool
596 1006102817 : ctor_omit_inherited_parms (tree fn)
597 : {
598 1006102817 : gcc_checking_assert (TREE_CODE (fn) == FUNCTION_DECL);
599 :
600 1006102817 : if (!DECL_BASE_CONSTRUCTOR_P (fn))
601 : return false;
602 :
603 149147866 : return base_ctor_omit_inherited_parms (DECL_CLONED_FUNCTION (fn));
604 : }
605 :
606 : /* True iff constructor(s) INH inherited into BINFO initializes INIT_BINFO.
607 : This can be true for multiple virtual bases as well as one direct
608 : non-virtual base. */
609 :
610 : static bool
611 5346592 : binfo_inherited_from (tree binfo, tree init_binfo, tree inh)
612 : {
613 : /* inh is an OVERLOAD if we inherited the same constructor along
614 : multiple paths, check all of them. */
615 5346958 : for (ovl_iterator iter (inh); iter; ++iter)
616 : {
617 118486 : tree fn = *iter;
618 118486 : tree base = DECL_CONTEXT (fn);
619 118486 : tree base_binfo = NULL_TREE;
620 118920 : for (int i = 0; BINFO_BASE_ITERATE (binfo, i, base_binfo); i++)
621 118920 : if (BINFO_TYPE (base_binfo) == base)
622 : break;
623 118486 : if (base_binfo == init_binfo
624 118486 : || (flag_new_inheriting_ctors
625 390 : && binfo_inherited_from (base_binfo, init_binfo,
626 780 : DECL_INHERITED_CTOR (fn))))
627 118129 : return true;
628 : }
629 5228463 : return false;
630 : }
631 :
632 : /* Subroutine of do_build_copy_constructor: Add a mem-initializer for BINFO
633 : given the parameter or parameters PARM, possibly inherited constructor
634 : base INH, or move flag MOVE_P. */
635 :
636 : static tree
637 159867 : add_one_base_init (tree binfo, tree parm, bool move_p, tree inh,
638 : tree member_init_list)
639 : {
640 159867 : tree init;
641 159867 : if (inh)
642 : {
643 : /* An inheriting constructor only has a mem-initializer for
644 : the base it inherits from. */
645 51725 : if (!binfo_inherited_from (TYPE_BINFO (current_class_type), binfo, inh))
646 : return member_init_list;
647 :
648 51656 : tree *p = &init;
649 51656 : init = NULL_TREE;
650 116778 : for (; parm; parm = DECL_CHAIN (parm))
651 : {
652 65122 : tree exp = forward_parm (parm);
653 65122 : *p = build_tree_list (NULL_TREE, exp);
654 65122 : p = &TREE_CHAIN (*p);
655 : }
656 : }
657 : else
658 : {
659 108142 : init = build_base_path (PLUS_EXPR, parm, binfo, 1,
660 : tf_warning_or_error);
661 108142 : if (move_p)
662 77930 : init = move (init);
663 108142 : init = build_tree_list (NULL_TREE, init);
664 : }
665 159798 : return tree_cons (binfo, init, member_init_list);
666 : }
667 :
668 : /* Generate code for default X(X&) or X(X&&) constructor or an inheriting
669 : constructor. */
670 :
671 : static void
672 245589 : do_build_copy_constructor (tree fndecl)
673 : {
674 245589 : tree parm = FUNCTION_FIRST_USER_PARM (fndecl);
675 491178 : bool move_p = DECL_MOVE_CONSTRUCTOR_P (fndecl);
676 245589 : bool trivial = trivial_fn_p (fndecl);
677 491178 : tree inh = DECL_INHERITED_CTOR (fndecl);
678 :
679 245589 : if (!inh)
680 193948 : parm = convert_from_reference (parm);
681 :
682 245589 : if (trivial)
683 : {
684 82 : if (is_empty_class (current_class_type))
685 : /* Don't copy the padding byte; it might not have been allocated
686 : if *this is a base subobject. */;
687 63 : else if (tree_int_cst_equal (TYPE_SIZE (current_class_type),
688 63 : CLASSTYPE_SIZE (current_class_type)))
689 : {
690 50 : tree t = cp_build_init_expr (current_class_ref, parm);
691 50 : finish_expr_stmt (t);
692 : }
693 : else
694 : {
695 : /* We must only copy the non-tail padding parts. */
696 13 : tree base_size = CLASSTYPE_SIZE_UNIT (current_class_type);
697 13 : base_size = size_binop (MINUS_EXPR, base_size, size_int (1));
698 13 : tree array_type = build_array_type (unsigned_char_type_node,
699 : build_index_type (base_size));
700 13 : tree alias_set = build_int_cst (TREE_TYPE (current_class_ptr), 0);
701 13 : tree lhs = build2 (MEM_REF, array_type,
702 13 : current_class_ptr, alias_set);
703 13 : tree rhs = build2 (MEM_REF, array_type,
704 13 : TREE_OPERAND (parm, 0), alias_set);
705 13 : tree t = cp_build_init_expr (lhs, rhs);
706 13 : finish_expr_stmt (t);
707 : }
708 : }
709 : else
710 : {
711 245507 : tree member_init_list = NULL_TREE;
712 245507 : int i;
713 245507 : tree binfo, base_binfo;
714 245507 : vec<tree, va_gc> *vbases;
715 :
716 : /* Initialize all the base-classes with the parameter converted
717 : to their type so that we get their copy constructor and not
718 : another constructor that takes current_class_type. We must
719 : deal with the binfo's directly as a direct base might be
720 : inaccessible due to ambiguity. */
721 245507 : for (vbases = CLASSTYPE_VBASECLASSES (current_class_type), i = 0;
722 245601 : vec_safe_iterate (vbases, i, &binfo); i++)
723 : {
724 94 : member_init_list = add_one_base_init (binfo, parm, move_p, inh,
725 : member_init_list);
726 : }
727 :
728 405355 : for (binfo = TYPE_BINFO (current_class_type), i = 0;
729 405355 : BINFO_BASE_ITERATE (binfo, i, base_binfo); i++)
730 : {
731 159848 : if (BINFO_VIRTUAL_P (base_binfo))
732 75 : continue;
733 159773 : member_init_list = add_one_base_init (base_binfo, parm, move_p,
734 : inh, member_init_list);
735 : }
736 :
737 245507 : if (!inh)
738 : {
739 193866 : int cvquals = cp_type_quals (TREE_TYPE (parm));
740 :
741 193866 : for (tree fields = TYPE_FIELDS (current_class_type);
742 11164294 : fields; fields = DECL_CHAIN (fields))
743 : {
744 10970428 : tree field = fields;
745 10970428 : tree expr_type;
746 :
747 10970428 : if (TREE_CODE (field) != FIELD_DECL)
748 10679896 : continue;
749 :
750 290532 : expr_type = TREE_TYPE (field);
751 290532 : if (DECL_NAME (field))
752 : {
753 182526 : if (VFIELD_NAME_P (DECL_NAME (field)))
754 904 : continue;
755 : }
756 108006 : else if (ANON_AGGR_TYPE_P (expr_type) && TYPE_FIELDS (expr_type))
757 : /* Just use the field; anonymous types can't have
758 : nontrivial copy ctors or assignment ops or this
759 : function would be deleted. */;
760 : else
761 107994 : continue;
762 :
763 : /* Compute the type of "init->field". If the copy-constructor
764 : parameter is, for example, "const S&", and the type of
765 : the field is "T", then the type will usually be "const
766 : T". (There are no cv-qualified variants of reference
767 : types.) */
768 181634 : if (!TYPE_REF_P (expr_type))
769 : {
770 180557 : int quals = cvquals;
771 :
772 180557 : if (DECL_MUTABLE_P (field))
773 9 : quals &= ~TYPE_QUAL_CONST;
774 180557 : quals |= cp_type_quals (expr_type);
775 180557 : expr_type = cp_build_qualified_type (expr_type, quals);
776 : }
777 :
778 181634 : tree init = build3 (COMPONENT_REF, expr_type, parm, field, NULL_TREE);
779 109405 : if (move_p && !TYPE_REF_P (expr_type)
780 : /* 'move' breaks bit-fields, and has no effect for scalars. */
781 290501 : && !scalarish_type_p (expr_type))
782 98191 : init = move (init);
783 181634 : init = build_tree_list (NULL_TREE, init);
784 :
785 181634 : member_init_list = tree_cons (field, init, member_init_list);
786 : }
787 : }
788 :
789 245507 : finish_mem_initializers (member_init_list);
790 : }
791 245589 : }
792 :
793 : static void
794 47244 : do_build_copy_assign (tree fndecl)
795 : {
796 47244 : tree parm = DECL_CHAIN (DECL_ARGUMENTS (fndecl));
797 47244 : tree compound_stmt;
798 47244 : bool move_p = move_fn_p (fndecl);
799 47244 : bool trivial = trivial_fn_p (fndecl);
800 47244 : int flags = LOOKUP_NORMAL | LOOKUP_NONVIRTUAL | LOOKUP_DEFAULTED;
801 :
802 47244 : compound_stmt = begin_compound_stmt (0);
803 47244 : parm = convert_from_reference (parm);
804 :
805 : /* If we are building a defaulted xobj copy/move assignment operator then
806 : current_class_ref will not have been set up.
807 : Kind of an icky hack, but what can ya do? */
808 94488 : tree const class_ref = DECL_XOBJ_MEMBER_FUNCTION_P (fndecl)
809 94488 : ? cp_build_fold_indirect_ref (DECL_ARGUMENTS (fndecl)) : current_class_ref;
810 :
811 47244 : if (trivial
812 47244 : && is_empty_class (current_class_type))
813 : /* Don't copy the padding byte; it might not have been allocated
814 : if *this is a base subobject. */;
815 47241 : else if (trivial)
816 : {
817 16 : tree t = build2 (MODIFY_EXPR, void_type_node, class_ref, parm);
818 16 : finish_expr_stmt (t);
819 : }
820 : else
821 : {
822 47225 : tree fields;
823 47225 : int cvquals = cp_type_quals (TREE_TYPE (parm));
824 47225 : int i;
825 47225 : tree binfo, base_binfo;
826 :
827 : /* Assign to each of the direct base classes. */
828 47225 : for (binfo = TYPE_BINFO (current_class_type), i = 0;
829 66522 : BINFO_BASE_ITERATE (binfo, i, base_binfo); i++)
830 : {
831 19297 : tree converted_parm;
832 :
833 : /* We must convert PARM directly to the base class
834 : explicitly since the base class may be ambiguous. */
835 19297 : converted_parm = build_base_path (PLUS_EXPR, parm, base_binfo, 1,
836 : tf_warning_or_error);
837 19297 : if (move_p)
838 18669 : converted_parm = move (converted_parm);
839 : /* Call the base class assignment operator. */
840 19297 : releasing_vec parmvec (make_tree_vector_single (converted_parm));
841 19297 : finish_expr_stmt
842 19297 : (build_special_member_call (class_ref,
843 : assign_op_identifier,
844 : &parmvec,
845 : base_binfo,
846 : flags,
847 : tf_warning_or_error));
848 19297 : }
849 :
850 : /* Assign to each of the non-static data members. */
851 47225 : for (fields = TYPE_FIELDS (current_class_type);
852 1621918 : fields;
853 1574693 : fields = DECL_CHAIN (fields))
854 : {
855 1574693 : tree comp = class_ref;
856 1574693 : tree init = parm;
857 1574693 : tree field = fields;
858 1574693 : tree expr_type;
859 1574693 : int quals;
860 :
861 1574693 : if (TREE_CODE (field) != FIELD_DECL || DECL_ARTIFICIAL (field))
862 1544496 : continue;
863 :
864 30197 : expr_type = TREE_TYPE (field);
865 :
866 30197 : if (CP_TYPE_CONST_P (expr_type))
867 : {
868 2 : error ("non-static const member %q#D, cannot use default "
869 : "assignment operator", field);
870 2 : continue;
871 : }
872 30195 : else if (TYPE_REF_P (expr_type))
873 : {
874 1 : error ("non-static reference member %q#D, cannot use "
875 : "default assignment operator", field);
876 1 : continue;
877 : }
878 :
879 30194 : if (DECL_NAME (field))
880 : {
881 30191 : if (VFIELD_NAME_P (DECL_NAME (field)))
882 0 : continue;
883 : }
884 3 : else if (ANON_AGGR_TYPE_P (expr_type)
885 6 : && TYPE_FIELDS (expr_type) != NULL_TREE)
886 : /* Just use the field; anonymous types can't have
887 : nontrivial copy ctors or assignment ops or this
888 : function would be deleted. */;
889 : else
890 0 : continue;
891 :
892 30194 : comp = build3 (COMPONENT_REF, expr_type, comp, field, NULL_TREE);
893 :
894 : /* Compute the type of init->field */
895 30194 : quals = cvquals;
896 30194 : if (DECL_MUTABLE_P (field))
897 3 : quals &= ~TYPE_QUAL_CONST;
898 30194 : expr_type = cp_build_qualified_type (expr_type, quals);
899 :
900 30194 : init = build3 (COMPONENT_REF, expr_type, init, field, NULL_TREE);
901 27876 : if (move_p && !TYPE_REF_P (expr_type)
902 : /* 'move' breaks bit-fields, and has no effect for scalars. */
903 58070 : && !scalarish_type_p (expr_type))
904 27685 : init = move (init);
905 :
906 30194 : if (DECL_NAME (field))
907 30191 : init = cp_build_modify_expr (input_location, comp, NOP_EXPR, init,
908 : tf_warning_or_error);
909 : else
910 3 : init = build2 (MODIFY_EXPR, TREE_TYPE (comp), comp, init);
911 30194 : finish_expr_stmt (init);
912 : }
913 : }
914 47244 : finish_return_stmt (class_ref);
915 47244 : finish_compound_stmt (compound_stmt);
916 47244 : }
917 :
918 : /* C++20 <compare> comparison category types. */
919 :
920 : enum comp_cat_tag
921 : {
922 : cc_partial_ordering,
923 : cc_weak_ordering,
924 : cc_strong_ordering,
925 : cc_last
926 : };
927 :
928 : /* Names of the comparison categories and their value members, to be indexed by
929 : comp_cat_tag enumerators. genericize_spaceship below relies on the ordering
930 : of the members. */
931 :
932 : struct comp_cat_info_t
933 : {
934 : const char *name;
935 : const char *members[4];
936 : };
937 : static const comp_cat_info_t comp_cat_info[cc_last]
938 : = {
939 : { "partial_ordering", { "equivalent", "greater", "less", "unordered" } },
940 : { "weak_ordering", { "equivalent", "greater", "less" } },
941 : { "strong_ordering", { "equal", "greater", "less" } }
942 : };
943 :
944 : /* A cache of the category types to speed repeated lookups. */
945 :
946 : static GTY((deletable)) tree comp_cat_cache[cc_last];
947 :
948 : /* Look up one of the result variables in the comparison category type. */
949 :
950 : static tree
951 989907 : lookup_comparison_result (tree type, const char *name_str,
952 : tsubst_flags_t complain = tf_warning_or_error)
953 : {
954 989907 : tree name = get_identifier (name_str);
955 989907 : tree decl = lookup_qualified_name (type, name);
956 989907 : if (TREE_CODE (decl) != VAR_DECL)
957 : {
958 7 : if (complain & tf_error)
959 : {
960 4 : auto_diagnostic_group d;
961 4 : if (decl == error_mark_node || TREE_CODE (decl) == TREE_LIST)
962 1 : qualified_name_lookup_error (type, name, decl, input_location);
963 : else
964 3 : error ("%qD is not a static data member", decl);
965 4 : inform (input_location, "determining value of %qs", "operator<=>");
966 4 : }
967 7 : return error_mark_node;
968 : }
969 : return decl;
970 : }
971 :
972 : /* Look up a <compare> comparison category type in std. */
973 :
974 : static tree
975 594247 : lookup_comparison_category (comp_cat_tag tag,
976 : tsubst_flags_t complain = tf_warning_or_error)
977 : {
978 594247 : if (tree cached = comp_cat_cache[tag])
979 : return cached;
980 :
981 77995 : tree name = get_identifier (comp_cat_info[tag].name);
982 77995 : tree decl = lookup_qualified_name (std_node, name);
983 77995 : if (TREE_CODE (decl) != TYPE_DECL)
984 : {
985 19 : if (complain & tf_error)
986 : {
987 10 : auto_diagnostic_group d;
988 10 : if (decl == error_mark_node || TREE_CODE (decl) == TREE_LIST)
989 7 : qualified_name_lookup_error (std_node, name, decl, input_location);
990 : else
991 3 : error ("%qD is not a type", decl);
992 10 : inform (input_location, "forming type of %qs", "operator<=>");
993 10 : }
994 19 : return error_mark_node;
995 : }
996 : /* Also make sure we can look up the value members now, since we won't
997 : really use them until genericize time. */
998 77976 : tree type = TREE_TYPE (decl);
999 311988 : for (int i = 0; i < 4; ++i)
1000 : {
1001 311892 : const char *p = comp_cat_info[tag].members[i];
1002 311892 : if (!p) break;
1003 234016 : if (lookup_comparison_result (type, p, complain)
1004 234016 : == error_mark_node)
1005 : return error_mark_node;
1006 : }
1007 77972 : return comp_cat_cache[tag] = type;
1008 : }
1009 :
1010 : /* Wrapper that takes the tag rather than the type. */
1011 :
1012 : static tree
1013 315 : lookup_comparison_result (comp_cat_tag tag, const char *name_str,
1014 : tsubst_flags_t complain = tf_warning_or_error)
1015 : {
1016 315 : tree type = lookup_comparison_category (tag, complain);
1017 315 : return lookup_comparison_result (type, name_str, complain);
1018 : }
1019 :
1020 : /* Wrapper that takes the index into the members array instead of the name. */
1021 :
1022 : static tree
1023 755576 : lookup_comparison_result (comp_cat_tag tag, tree type, int idx)
1024 : {
1025 755576 : const char *name_str = comp_cat_info[tag].members[idx];
1026 755576 : if (!name_str)
1027 : return NULL_TREE;
1028 755576 : return lookup_comparison_result (type, name_str);
1029 : }
1030 :
1031 : /* Does TYPE correspond to TAG? */
1032 :
1033 : static bool
1034 751215 : is_cat (tree type, comp_cat_tag tag)
1035 : {
1036 751215 : tree name = TYPE_LINKAGE_IDENTIFIER (type);
1037 751215 : return id_equal (name, comp_cat_info[tag].name);
1038 : }
1039 :
1040 : /* Return the comp_cat_tag for TYPE. */
1041 :
1042 : static comp_cat_tag
1043 250950 : cat_tag_for (tree type)
1044 : {
1045 250950 : if (!CLASS_TYPE_P (type) || !decl_in_std_namespace_p (TYPE_MAIN_DECL (type)))
1046 48 : return cc_last;
1047 751215 : for (int i = 0; i < cc_last; ++i)
1048 : {
1049 751215 : comp_cat_tag tag = (comp_cat_tag)i;
1050 751215 : if (is_cat (type, tag))
1051 : return tag;
1052 : }
1053 : return cc_last;
1054 : }
1055 :
1056 : /* Return the comparison category tag of a <=> expression with non-class type
1057 : OPTYPE. */
1058 :
1059 : static comp_cat_tag
1060 590562 : spaceship_comp_cat (tree optype)
1061 : {
1062 590562 : if (INTEGRAL_OR_ENUMERATION_TYPE_P (optype) || TYPE_PTROBV_P (optype))
1063 : return cc_strong_ordering;
1064 557 : else if (SCALAR_FLOAT_TYPE_P (optype))
1065 : return cc_partial_ordering;
1066 :
1067 : /* ??? should vector <=> produce a vector of one of the above? */
1068 0 : gcc_unreachable ();
1069 : }
1070 :
1071 : /* Return the comparison category type of a <=> expression with non-class type
1072 : OPTYPE. */
1073 :
1074 : tree
1075 590562 : spaceship_type (tree optype, tsubst_flags_t complain)
1076 : {
1077 590562 : comp_cat_tag tag = spaceship_comp_cat (optype);
1078 590562 : return lookup_comparison_category (tag, complain);
1079 : }
1080 :
1081 : /* Turn <=> with type TYPE and operands OP0 and OP1 into GENERIC.
1082 : This is also used by build_comparison_op for fallback to op< and op==
1083 : in a defaulted op<=>. */
1084 :
1085 : tree
1086 250528 : genericize_spaceship (location_t loc, tree type, tree op0, tree op1)
1087 : {
1088 : /* ??? maybe optimize based on knowledge of representation? */
1089 250528 : comp_cat_tag tag = cat_tag_for (type);
1090 :
1091 250528 : if (tag == cc_last && is_auto (type))
1092 : {
1093 : /* build_comparison_op is checking to see if we want to suggest changing
1094 : the op<=> return type from auto to a specific comparison category; any
1095 : category will do for now. */
1096 0 : tag = cc_strong_ordering;
1097 0 : type = lookup_comparison_category (tag, tf_none);
1098 0 : if (type == error_mark_node)
1099 : return error_mark_node;
1100 : }
1101 250528 : else if (tag == cc_last)
1102 3 : return error_mark_node;
1103 :
1104 250525 : tree r;
1105 250525 : bool scalar = SCALAR_TYPE_P (TREE_TYPE (op0));
1106 250468 : if (scalar)
1107 : {
1108 250468 : op0 = save_expr (op0);
1109 250468 : op1 = save_expr (op1);
1110 : }
1111 :
1112 250525 : tree gt = lookup_comparison_result (tag, type, 1);
1113 :
1114 250525 : int flags = LOOKUP_NORMAL;
1115 250525 : tsubst_flags_t complain = tf_none;
1116 250525 : tree comp;
1117 :
1118 250525 : if (tag == cc_partial_ordering)
1119 : {
1120 : /* op0 == op1 ? equivalent : op0 < op1 ? less :
1121 : op1 < op0 ? greater : unordered */
1122 671 : tree uo = lookup_comparison_result (tag, type, 3);
1123 671 : if (scalar)
1124 : {
1125 : /* For scalars use the low level operations; using build_new_op causes
1126 : trouble with constexpr eval in the middle of genericize (100367). */
1127 659 : comp = fold_build2 (LT_EXPR, boolean_type_node, op1, op0);
1128 659 : r = fold_build3 (COND_EXPR, type, comp, gt, uo);
1129 : }
1130 : else
1131 : {
1132 12 : comp = build_new_op (loc, LT_EXPR, flags, op1, op0, complain);
1133 12 : r = build_conditional_expr (loc, comp, gt, uo, complain);
1134 : }
1135 : }
1136 : else
1137 : /* op0 == op1 ? equal : op0 < op1 ? less : greater */
1138 : r = gt;
1139 :
1140 250525 : tree lt = lookup_comparison_result (tag, type, 2);
1141 250525 : if (scalar)
1142 : {
1143 250468 : comp = fold_build2 (LT_EXPR, boolean_type_node, op0, op1);
1144 250468 : r = fold_build3 (COND_EXPR, type, comp, lt, r);
1145 : }
1146 : else
1147 : {
1148 57 : comp = build_new_op (loc, LT_EXPR, flags, op0, op1, complain);
1149 57 : r = build_conditional_expr (loc, comp, lt, r, complain);
1150 : }
1151 :
1152 250525 : tree eq = lookup_comparison_result (tag, type, 0);
1153 250525 : if (scalar)
1154 : {
1155 250468 : comp = fold_build2 (EQ_EXPR, boolean_type_node, op0, op1);
1156 250468 : r = fold_build3 (COND_EXPR, type, comp, eq, r);
1157 : }
1158 : else
1159 : {
1160 57 : comp = build_new_op (loc, EQ_EXPR, flags, op0, op1, complain);
1161 57 : r = build_conditional_expr (loc, comp, eq, r, complain);
1162 : }
1163 :
1164 : return r;
1165 : }
1166 :
1167 : /* Check that the signature of a defaulted comparison operator is
1168 : well-formed. */
1169 :
1170 : static bool
1171 215185 : early_check_defaulted_comparison (tree fn)
1172 : {
1173 215185 : location_t loc = DECL_SOURCE_LOCATION (fn);
1174 215185 : tree ctx;
1175 215185 : if (DECL_CLASS_SCOPE_P (fn))
1176 23937 : ctx = DECL_CONTEXT (fn);
1177 : else
1178 382496 : ctx = DECL_FRIEND_CONTEXT (fn);
1179 215185 : bool ok = true;
1180 :
1181 215185 : if (cxx_dialect < cxx20)
1182 : {
1183 4 : error_at (loc, "defaulted %qD only available with %<-std=c++20%> or "
1184 : "%<-std=gnu++20%>", fn);
1185 4 : return false;
1186 : }
1187 :
1188 215181 : if (!DECL_OVERLOADED_OPERATOR_IS (fn, SPACESHIP_EXPR)
1189 215181 : && !same_type_p (TREE_TYPE (TREE_TYPE (fn)), boolean_type_node))
1190 : {
1191 6 : enum diagnostics::kind kind = diagnostics::kind::unspecified;
1192 6 : int opt = 0;
1193 6 : if (is_auto (TREE_TYPE (fn)))
1194 : kind = diagnostics::kind::pedwarn;
1195 : else
1196 6 : kind = diagnostics::kind::error;
1197 6 : emit_diagnostic (kind, loc, opt,
1198 : "defaulted %qD must return %<bool%>", fn);
1199 6 : if (kind == diagnostics::kind::error)
1200 215181 : ok = false;
1201 : }
1202 :
1203 215181 : bool mem = DECL_IOBJ_MEMBER_FUNCTION_P (fn);
1204 215181 : if (mem && type_memfn_quals (TREE_TYPE (fn)) != TYPE_QUAL_CONST)
1205 : {
1206 3 : error_at (loc, "defaulted %qD must be %<const%>", fn);
1207 3 : ok = false;
1208 : }
1209 215181 : if (mem && type_memfn_rqual (TREE_TYPE (fn)) == REF_QUAL_RVALUE)
1210 : {
1211 3 : error_at (loc, "defaulted %qD must not have %<&&%> ref-qualifier", fn);
1212 3 : ok = false;
1213 : }
1214 215181 : tree parmnode = FUNCTION_FIRST_USER_PARMTYPE (fn);
1215 215181 : bool saw_byval = false;
1216 215181 : bool saw_byref = mem;
1217 215181 : bool saw_bad = false;
1218 621616 : for (; parmnode != void_list_node; parmnode = TREE_CHAIN (parmnode))
1219 : {
1220 406435 : tree parmtype = TREE_VALUE (parmnode);
1221 406435 : if (CLASS_TYPE_P (parmtype))
1222 : saw_byval = true;
1223 326259 : else if (TREE_CODE (parmtype) == REFERENCE_TYPE
1224 326256 : && !TYPE_REF_IS_RVALUE (parmtype)
1225 652509 : && TYPE_QUALS (TREE_TYPE (parmtype)) == TYPE_QUAL_CONST)
1226 : {
1227 326250 : saw_byref = true;
1228 326250 : parmtype = TREE_TYPE (parmtype);
1229 : }
1230 : else
1231 : saw_bad = true;
1232 :
1233 406435 : if (!saw_bad && !ctx)
1234 : {
1235 : /* Defaulted outside the class body. */
1236 21 : ctx = TYPE_MAIN_VARIANT (parmtype);
1237 21 : if (!is_friend (ctx, fn))
1238 : {
1239 15 : auto_diagnostic_group d;
1240 15 : error_at (loc, "defaulted %qD is not a friend of %qT", fn, ctx);
1241 15 : inform (location_of (ctx), "declared here");
1242 15 : ok = false;
1243 15 : }
1244 : }
1245 406414 : else if (!same_type_ignoring_top_level_qualifiers_p (parmtype, ctx))
1246 9 : saw_bad = true;
1247 : }
1248 :
1249 215181 : if (saw_bad || (saw_byval && saw_byref))
1250 : {
1251 48 : if (DECL_IOBJ_MEMBER_FUNCTION_P (fn))
1252 24 : error_at (loc, "defaulted member %qD must have parameter type "
1253 : "%<const %T&%>", fn, ctx);
1254 24 : else if (saw_bad)
1255 3 : error_at (loc, "defaulted %qD must have parameters of either type "
1256 : "%<const %T&%> or %qT", fn, ctx, ctx);
1257 : else
1258 21 : error_at (loc, "defaulted %qD must have parameters of either type "
1259 : "%<const %T&%> or %qT, not both", fn, ctx, ctx);
1260 : ok = false;
1261 : }
1262 :
1263 : /* We still need to deduce deleted/constexpr/noexcept and maybe return. */
1264 215181 : DECL_MAYBE_DELETED (fn) = ok;
1265 :
1266 215181 : return ok;
1267 : }
1268 :
1269 : /* Subroutine of build_comparison_op. Given the vec of memberwise
1270 : comparisons COMPS, calculate the overall comparison category for
1271 : operator<=>. */
1272 :
1273 : static tree
1274 153 : common_comparison_type (vec<tree> &comps)
1275 : {
1276 153 : tree seen[cc_last] = {};
1277 :
1278 285 : for (unsigned i = 0; i < comps.length(); ++i)
1279 : {
1280 132 : tree comp = comps[i];
1281 132 : if (TREE_CODE (comp) == TREE_LIST)
1282 3 : comp = TREE_VALUE (comp);
1283 132 : tree ctype = TREE_TYPE (comp);
1284 132 : comp_cat_tag tag = cat_tag_for (ctype);
1285 : /* build_comparison_op already checked this. */
1286 132 : gcc_checking_assert (tag < cc_last);
1287 132 : seen[tag] = ctype;
1288 : }
1289 :
1290 : /* Otherwise, if at least one T i is std::partial_ordering, U is
1291 : std::partial_ordering. */
1292 153 : if (tree t = seen[cc_partial_ordering]) return t;
1293 :
1294 : /* Otherwise, if at least one T i is std::weak_ordering, U is
1295 : std::weak_ordering. */
1296 133 : if (tree t = seen[cc_weak_ordering]) return t;
1297 :
1298 : /* Otherwise, U is std::strong_ordering. */
1299 133 : if (tree t = seen[cc_strong_ordering]) return t;
1300 38 : return lookup_comparison_category (cc_strong_ordering);
1301 : }
1302 :
1303 : /* Data structure for build_comparison_op. */
1304 :
1305 : struct comp_info
1306 : {
1307 : tree fndecl;
1308 : location_t loc;
1309 : tsubst_flags_t complain;
1310 : tree_code code;
1311 : comp_cat_tag retcat;
1312 : bool first_time;
1313 : bool constexp;
1314 : bool was_constexp;
1315 : bool noex;
1316 :
1317 61497 : comp_info (tree fndecl, tsubst_flags_t complain)
1318 61497 : : fndecl (fndecl), complain (complain)
1319 : {
1320 61497 : loc = DECL_SOURCE_LOCATION (fndecl);
1321 :
1322 61497 : first_time = DECL_MAYBE_DELETED (fndecl);
1323 61497 : DECL_MAYBE_DELETED (fndecl) = false;
1324 :
1325 : /* Do we want to try to set constexpr? */
1326 61497 : was_constexp = DECL_DECLARED_CONSTEXPR_P (fndecl);
1327 61497 : constexp = first_time;
1328 61497 : if (constexp)
1329 : /* Set this for var_in_constexpr_fn. */
1330 61397 : DECL_DECLARED_CONSTEXPR_P (fndecl) = true;
1331 :
1332 : /* Do we want to try to set noexcept? */
1333 61497 : noex = first_time;
1334 61497 : if (noex)
1335 : {
1336 61397 : tree raises = TYPE_RAISES_EXCEPTIONS (TREE_TYPE (fndecl));
1337 83868 : if (raises && !UNEVALUATED_NOEXCEPT_SPEC_P (raises))
1338 : /* There was an explicit exception-specification. */
1339 22471 : noex = false;
1340 : }
1341 61497 : }
1342 :
1343 : /* EXPR is an expression built as part of the function body.
1344 : Adjust the properties appropriately. */
1345 89619 : void check (tree expr)
1346 : {
1347 89619 : if (expr == error_mark_node)
1348 0 : DECL_DELETED_FN (fndecl) = true;
1349 65 : if ((constexp || was_constexp)
1350 89646 : && !potential_rvalue_constant_expression (expr))
1351 : {
1352 1284 : if (was_constexp)
1353 12 : require_potential_rvalue_constant_expression_fncheck (expr);
1354 : else
1355 1272 : constexp = false;
1356 : }
1357 89619 : if (noex && !expr_noexcept_p (expr, tf_none))
1358 65 : noex = false;
1359 89619 : }
1360 :
1361 61497 : ~comp_info ()
1362 : {
1363 61497 : if (first_time)
1364 : {
1365 61397 : DECL_DECLARED_CONSTEXPR_P (fndecl) = constexp || was_constexp;
1366 61397 : tree raises = TYPE_RAISES_EXCEPTIONS (TREE_TYPE (fndecl));
1367 83868 : if (!raises || UNEVALUATED_NOEXCEPT_SPEC_P (raises))
1368 : {
1369 38926 : raises = noex ? noexcept_true_spec : noexcept_false_spec;
1370 38926 : TREE_TYPE (fndecl) = build_exception_variant (TREE_TYPE (fndecl),
1371 : raises);
1372 : }
1373 : }
1374 61497 : }
1375 : };
1376 :
1377 : /* Subroutine of build_comparison_op, to compare a single subobject. */
1378 :
1379 : static tree
1380 89510 : do_one_comp (location_t loc, const comp_info &info, tree sub, tree lhs, tree rhs)
1381 : {
1382 89510 : const tree_code code = info.code;
1383 89510 : const tree fndecl = info.fndecl;
1384 89510 : const comp_cat_tag retcat = info.retcat;
1385 89510 : const tsubst_flags_t complain = info.complain;
1386 :
1387 89510 : tree overload = NULL_TREE;
1388 89510 : int flags = LOOKUP_NORMAL | LOOKUP_NONVIRTUAL | LOOKUP_DEFAULTED;
1389 : /* If we have an explicit comparison category return type we can fall back
1390 : to </=, so don't give an error yet if <=> lookup fails. */
1391 89510 : bool tentative = retcat != cc_last;
1392 178893 : tree comp = build_new_op (loc, code, flags, lhs, rhs,
1393 : NULL_TREE, NULL_TREE, &overload,
1394 : tentative ? tf_none : complain);
1395 :
1396 89510 : if (code != SPACESHIP_EXPR)
1397 : return comp;
1398 :
1399 343 : tree rettype = TREE_TYPE (TREE_TYPE (fndecl));
1400 :
1401 343 : if (comp == error_mark_node)
1402 : {
1403 96 : if (overload == NULL_TREE && (tentative || complain))
1404 : {
1405 : /* No viable <=>, try using op< and op==. */
1406 60 : tree lteq = genericize_spaceship (loc, rettype, lhs, rhs);
1407 60 : if (lteq != error_mark_node)
1408 : {
1409 : /* We found usable < and ==. */
1410 27 : if (retcat != cc_last)
1411 : /* Return type is a comparison category, use them. */
1412 : comp = lteq;
1413 9 : else if (complain & tf_error)
1414 : /* Return type is auto, suggest changing it. */
1415 9 : inform (info.loc, "changing the return type from %qs "
1416 : "to a comparison category type will allow the "
1417 : "comparison to use %qs and %qs", "auto",
1418 : "operator<", "operator==");
1419 : }
1420 33 : else if (tentative && complain)
1421 : /* No usable < and ==, give an error for op<=>. */
1422 12 : build_new_op (loc, code, flags, lhs, rhs, complain);
1423 : }
1424 96 : if (comp == error_mark_node)
1425 : return error_mark_node;
1426 : }
1427 :
1428 265 : if (FNDECL_USED_AUTO (fndecl)
1429 265 : && cat_tag_for (TREE_TYPE (comp)) == cc_last)
1430 : {
1431 : /* The operator function is defined as deleted if ... Ri is not a
1432 : comparison category type. */
1433 6 : if (complain & tf_error)
1434 3 : inform (loc,
1435 : "three-way comparison of %qD has type %qT, not a "
1436 3 : "comparison category type", sub, TREE_TYPE (comp));
1437 6 : return error_mark_node;
1438 : }
1439 259 : else if (!FNDECL_USED_AUTO (fndecl)
1440 259 : && !can_convert (rettype, TREE_TYPE (comp), complain))
1441 : {
1442 30 : if (complain & tf_error)
1443 15 : error_at (loc,
1444 : "three-way comparison of %qD has type %qT, which "
1445 : "does not convert to %qT",
1446 15 : sub, TREE_TYPE (comp), rettype);
1447 30 : return error_mark_node;
1448 : }
1449 :
1450 : return comp;
1451 : }
1452 :
1453 : /* Build up the definition of a defaulted comparison operator. Unlike other
1454 : defaulted functions that use synthesized_method_walk to determine whether
1455 : the function is e.g. deleted, for comparisons we use the same code. We try
1456 : to use synthesize_method at the earliest opportunity and bail out if the
1457 : function ends up being deleted. */
1458 :
1459 : void
1460 61497 : build_comparison_op (tree fndecl, bool defining, tsubst_flags_t complain)
1461 : {
1462 61497 : comp_info info (fndecl, complain);
1463 :
1464 61497 : if (!defining && !(complain & tf_error) && !DECL_MAYBE_DELETED (fndecl))
1465 : return;
1466 :
1467 61488 : int flags = LOOKUP_NORMAL;
1468 61488 : const ovl_op_info_t *op = IDENTIFIER_OVL_OP_INFO (DECL_NAME (fndecl));
1469 61488 : tree_code code = info.code = op->tree_code;
1470 :
1471 61488 : tree lhs = DECL_ARGUMENTS (fndecl);
1472 61488 : tree rhs = DECL_CHAIN (lhs);
1473 61488 : if (is_this_parameter (lhs))
1474 27858 : lhs = cp_build_fold_indirect_ref (lhs);
1475 : else
1476 33630 : lhs = convert_from_reference (lhs);
1477 61488 : rhs = convert_from_reference (rhs);
1478 61488 : tree ctype = TYPE_MAIN_VARIANT (TREE_TYPE (lhs));
1479 61488 : gcc_assert (!defining || COMPLETE_TYPE_P (ctype));
1480 :
1481 61488 : iloc_sentinel ils (info.loc);
1482 :
1483 : /* A defaulted comparison operator function for class C is defined as
1484 : deleted if ... C has variant members. */
1485 61488 : if (TREE_CODE (ctype) == UNION_TYPE
1486 61488 : && next_aggregate_field (TYPE_FIELDS (ctype)))
1487 : {
1488 6 : if (complain & tf_error)
1489 3 : inform (info.loc, "cannot default compare union %qT", ctype);
1490 6 : DECL_DELETED_FN (fndecl) = true;
1491 6 : return;
1492 : }
1493 :
1494 61482 : tree compound_stmt = NULL_TREE;
1495 61482 : if (defining)
1496 61400 : compound_stmt = begin_compound_stmt (0);
1497 : else
1498 82 : ++cp_unevaluated_operand;
1499 :
1500 61482 : tree rettype = TREE_TYPE (TREE_TYPE (fndecl));
1501 61482 : if (code != SPACESHIP_EXPR && is_auto (rettype))
1502 : {
1503 0 : rettype = boolean_type_node;
1504 0 : apply_deduced_return_type (fndecl, rettype);
1505 : }
1506 :
1507 61482 : if (code == EQ_EXPR || code == SPACESHIP_EXPR)
1508 : {
1509 61407 : comp_cat_tag &retcat = (info.retcat = cc_last);
1510 61722 : if (code == SPACESHIP_EXPR && !FNDECL_USED_AUTO (fndecl))
1511 140 : retcat = cat_tag_for (rettype);
1512 :
1513 61407 : bool bad = false;
1514 61407 : auto_vec<tree> comps;
1515 :
1516 : /* Compare the base subobjects. We handle them this way, rather than in
1517 : the field loop below, because maybe_instantiate_noexcept might bring
1518 : us here before we've built the base fields. */
1519 62672 : for (tree base_binfo : BINFO_BASE_BINFOS (TYPE_BINFO (ctype)))
1520 : {
1521 1265 : tree lhs_base
1522 1265 : = build_base_path (PLUS_EXPR, lhs, base_binfo, 0, complain);
1523 1265 : tree rhs_base
1524 1265 : = build_base_path (PLUS_EXPR, rhs, base_binfo, 0, complain);
1525 :
1526 1265 : location_t loc = DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (ctype));
1527 1265 : tree comp = do_one_comp (loc, info, BINFO_TYPE (base_binfo),
1528 1265 : lhs_base, rhs_base);
1529 1265 : if (comp == error_mark_node)
1530 : {
1531 12 : bad = true;
1532 12 : continue;
1533 : }
1534 :
1535 1253 : comps.safe_push (comp);
1536 : }
1537 :
1538 : /* Now compare the field subobjects. */
1539 61407 : for (tree field = next_aggregate_field (TYPE_FIELDS (ctype));
1540 150945 : field;
1541 89538 : field = next_aggregate_field (DECL_CHAIN (field)))
1542 : {
1543 179076 : if (DECL_VIRTUAL_P (field) || DECL_FIELD_IS_BASE (field))
1544 : /* We ignore the vptr, and we already handled bases. */
1545 1404 : continue;
1546 :
1547 88273 : tree expr_type = TREE_TYPE (field);
1548 :
1549 88273 : location_t field_loc = DECL_SOURCE_LOCATION (field);
1550 :
1551 : /* A defaulted comparison operator function for class C is defined as
1552 : deleted if any non-static data member of C is of reference type or
1553 : C has variant members. */
1554 88273 : if (TREE_CODE (expr_type) == REFERENCE_TYPE)
1555 : {
1556 10 : if (complain & tf_error)
1557 4 : inform (field_loc, "cannot default compare "
1558 : "reference member %qD", field);
1559 10 : bad = true;
1560 10 : continue;
1561 : }
1562 6 : else if (ANON_UNION_TYPE_P (expr_type)
1563 88269 : && next_aggregate_field (TYPE_FIELDS (expr_type)))
1564 : {
1565 6 : if (complain & tf_error)
1566 3 : inform (field_loc, "cannot default compare "
1567 : "anonymous union member");
1568 6 : bad = true;
1569 6 : continue;
1570 : }
1571 :
1572 88257 : tree lhs_mem = build3_loc (field_loc, COMPONENT_REF, expr_type, lhs,
1573 : field, NULL_TREE);
1574 88257 : tree rhs_mem = build3_loc (field_loc, COMPONENT_REF, expr_type, rhs,
1575 : field, NULL_TREE);
1576 88257 : tree loop_indexes = NULL_TREE;
1577 176520 : while (TREE_CODE (expr_type) == ARRAY_TYPE)
1578 : {
1579 : /* Flexible array member. */
1580 18 : if (TYPE_DOMAIN (expr_type) == NULL_TREE
1581 18 : || TYPE_MAX_VALUE (TYPE_DOMAIN (expr_type)) == NULL_TREE)
1582 : {
1583 6 : if (complain & tf_error)
1584 3 : inform (field_loc, "cannot default compare "
1585 : "flexible array member");
1586 : bad = true;
1587 : break;
1588 : }
1589 12 : tree maxval = TYPE_MAX_VALUE (TYPE_DOMAIN (expr_type));
1590 : /* [0] array. No subobjects to compare, just skip it. */
1591 12 : if (integer_all_onesp (maxval))
1592 : break;
1593 6 : tree idx;
1594 : /* [1] array, no loop needed, just add [0] ARRAY_REF.
1595 : Similarly if !defining. */
1596 6 : if (integer_zerop (maxval) || !defining)
1597 3 : idx = size_zero_node;
1598 : /* Some other array, will need runtime loop. */
1599 : else
1600 : {
1601 3 : idx = get_internal_target_expr (maxval);
1602 3 : loop_indexes = tree_cons (idx, NULL_TREE, loop_indexes);
1603 : }
1604 6 : expr_type = TREE_TYPE (expr_type);
1605 6 : lhs_mem = build4_loc (field_loc, ARRAY_REF, expr_type, lhs_mem,
1606 : idx, NULL_TREE, NULL_TREE);
1607 6 : rhs_mem = build4_loc (field_loc, ARRAY_REF, expr_type, rhs_mem,
1608 : idx, NULL_TREE, NULL_TREE);
1609 : }
1610 88257 : if (TREE_CODE (expr_type) == ARRAY_TYPE)
1611 12 : continue;
1612 :
1613 88245 : tree comp = do_one_comp (field_loc, info, field, lhs_mem, rhs_mem);
1614 88245 : if (comp == error_mark_node)
1615 : {
1616 111 : bad = true;
1617 111 : continue;
1618 : }
1619 :
1620 : /* Most of the time, comp is the expression that should be evaluated
1621 : to compare the two members. If the expression needs to be
1622 : evaluated more than once in a loop, it will be a TREE_LIST
1623 : instead, whose TREE_VALUE is the expression for one array element,
1624 : TREE_PURPOSE is innermost iterator temporary and if the array
1625 : is multidimensional, TREE_CHAIN will contain another TREE_LIST
1626 : with second innermost iterator in its TREE_PURPOSE and so on. */
1627 88134 : if (loop_indexes)
1628 : {
1629 3 : TREE_VALUE (loop_indexes) = comp;
1630 3 : comp = loop_indexes;
1631 : }
1632 88134 : comps.safe_push (comp);
1633 : }
1634 61407 : if (code == SPACESHIP_EXPR && is_auto (rettype))
1635 : {
1636 153 : rettype = common_comparison_type (comps);
1637 153 : apply_deduced_return_type (fndecl, rettype);
1638 : }
1639 61407 : tree retvaleq;
1640 61407 : if (code == EQ_EXPR)
1641 61092 : retvaleq = boolean_true_node;
1642 : else
1643 : {
1644 315 : tree seql = lookup_comparison_result (cc_strong_ordering,
1645 : "equal", complain);
1646 315 : retvaleq = build_static_cast (input_location, rettype, seql,
1647 : complain);
1648 315 : if (retvaleq == error_mark_node)
1649 : bad = true;
1650 : }
1651 61368 : if (bad)
1652 : {
1653 157 : DECL_DELETED_FN (fndecl) = true;
1654 157 : goto out;
1655 : }
1656 150601 : for (unsigned i = 0; i < comps.length(); ++i)
1657 : {
1658 89351 : tree comp = comps[i];
1659 89351 : tree eq, retval = NULL_TREE, if_ = NULL_TREE;
1660 89351 : tree loop_indexes = NULL_TREE;
1661 89351 : if (defining)
1662 : {
1663 89345 : if (TREE_CODE (comp) == TREE_LIST)
1664 : {
1665 3 : loop_indexes = comp;
1666 3 : comp = TREE_VALUE (comp);
1667 3 : loop_indexes = nreverse (loop_indexes);
1668 6 : for (tree loop_index = loop_indexes; loop_index;
1669 3 : loop_index = TREE_CHAIN (loop_index))
1670 : {
1671 3 : tree for_stmt = begin_for_stmt (NULL_TREE, NULL_TREE);
1672 3 : tree idx = TREE_PURPOSE (loop_index);
1673 3 : tree maxval = TARGET_EXPR_INITIAL (idx);
1674 3 : TARGET_EXPR_INITIAL (idx) = size_zero_node;
1675 3 : add_stmt (idx);
1676 3 : finish_init_stmt (for_stmt);
1677 3 : finish_for_cond (build2 (LE_EXPR, boolean_type_node, idx,
1678 : maxval), for_stmt, false, 0,
1679 : false);
1680 3 : finish_for_expr (cp_build_unary_op (PREINCREMENT_EXPR,
1681 3 : TARGET_EXPR_SLOT (idx),
1682 : false, complain),
1683 : for_stmt);
1684 : /* Store in TREE_VALUE the for_stmt tree, so that we can
1685 : later on call finish_for_stmt on it (in the reverse
1686 : order). */
1687 3 : TREE_VALUE (loop_index) = for_stmt;
1688 : }
1689 3 : loop_indexes = nreverse (loop_indexes);
1690 : }
1691 89345 : if_ = begin_if_stmt ();
1692 : }
1693 : /* Spaceship is specified to use !=, but for the comparison category
1694 : types, != is equivalent to !(==), so let's use == directly. */
1695 89351 : if (code == EQ_EXPR)
1696 : {
1697 : /* if (x==y); else return false; */
1698 89158 : eq = comp;
1699 89158 : retval = boolean_false_node;
1700 : }
1701 : else
1702 : {
1703 : /* if (auto v = x<=>y, v == 0); else return v; */
1704 193 : if (TREE_CODE (comp) == SPACESHIP_EXPR)
1705 0 : TREE_TYPE (comp) = rettype;
1706 : else
1707 193 : comp = build_static_cast (input_location, rettype, comp,
1708 : complain);
1709 193 : info.check (comp);
1710 193 : if (defining)
1711 : {
1712 193 : tree var = create_temporary_var (rettype);
1713 193 : DECL_NAME (var) = get_identifier ("retval");
1714 193 : pushdecl (var);
1715 193 : cp_finish_decl (var, comp, false, NULL_TREE, flags);
1716 193 : comp = retval = var;
1717 : }
1718 193 : eq = build_new_op (info.loc, EQ_EXPR, flags, comp,
1719 : integer_zero_node, NULL_TREE, NULL_TREE,
1720 : NULL, complain);
1721 : }
1722 89351 : tree ceq = contextual_conv_bool (eq, complain);
1723 89351 : info.check (ceq);
1724 89351 : if (defining)
1725 : {
1726 89345 : finish_if_stmt_cond (ceq, if_);
1727 89345 : finish_then_clause (if_);
1728 89345 : begin_else_clause (if_);
1729 89345 : finish_return_stmt (retval);
1730 89345 : finish_else_clause (if_);
1731 89345 : finish_if_stmt (if_);
1732 89348 : for (tree loop_index = loop_indexes; loop_index;
1733 3 : loop_index = TREE_CHAIN (loop_index))
1734 3 : finish_for_stmt (TREE_VALUE (loop_index));
1735 : }
1736 : }
1737 61250 : if (defining)
1738 61244 : finish_return_stmt (retvaleq);
1739 61407 : }
1740 75 : else if (code == NE_EXPR)
1741 : {
1742 27 : tree comp = build_new_op (info.loc, EQ_EXPR, flags, lhs, rhs,
1743 : NULL_TREE, NULL_TREE, NULL, complain);
1744 27 : comp = contextual_conv_bool (comp, complain);
1745 27 : info.check (comp);
1746 27 : if (defining)
1747 : {
1748 24 : tree neg = build1 (TRUTH_NOT_EXPR, boolean_type_node, comp);
1749 24 : finish_return_stmt (neg);
1750 : }
1751 : }
1752 : else
1753 : {
1754 48 : tree comp = build_new_op (info.loc, SPACESHIP_EXPR, flags, lhs, rhs,
1755 : NULL_TREE, NULL_TREE, NULL, complain);
1756 48 : tree comp2 = build_new_op (info.loc, code, flags, comp, integer_zero_node,
1757 : NULL_TREE, NULL_TREE, NULL, complain);
1758 48 : info.check (comp2);
1759 48 : if (defining)
1760 48 : finish_return_stmt (comp2);
1761 : }
1762 :
1763 61479 : out:
1764 61479 : if (defining)
1765 61400 : finish_compound_stmt (compound_stmt);
1766 : else
1767 82 : --cp_unevaluated_operand;
1768 61497 : }
1769 :
1770 : /* True iff DECL is an implicitly-declared special member function with no real
1771 : source location, so we can use its DECL_SOURCE_LOCATION to remember where we
1772 : triggered its synthesis. */
1773 :
1774 : bool
1775 2394827 : decl_remember_implicit_trigger_p (tree decl)
1776 : {
1777 2394827 : if (!DECL_ARTIFICIAL (decl))
1778 : return false;
1779 1145775 : special_function_kind sfk = special_function_p (decl);
1780 : /* Inherited constructors have the location of their using-declaration, and
1781 : operator== has the location of the corresponding operator<=>. */
1782 1145775 : return (sfk != sfk_inheriting_constructor
1783 1145775 : && sfk != sfk_comparison);
1784 : }
1785 :
1786 : /* Synthesize FNDECL, a non-static member function. */
1787 :
1788 : void
1789 1228431 : synthesize_method (tree fndecl)
1790 : {
1791 1228431 : bool need_body = true;
1792 1228431 : tree stmt;
1793 1228431 : location_t save_input_location = input_location;
1794 1228431 : int error_count = errorcount;
1795 1228431 : int warning_count = warningcount + werrorcount;
1796 1228431 : special_function_kind sfk = special_function_p (fndecl);
1797 1228431 : auto_diagnostic_group d;
1798 :
1799 : /* Reset the source location, we might have been previously
1800 : deferred, and thus have saved where we were first needed. */
1801 1228431 : if (decl_remember_implicit_trigger_p (fndecl))
1802 1042446 : DECL_SOURCE_LOCATION (fndecl)
1803 521223 : = DECL_SOURCE_LOCATION (TYPE_NAME (DECL_CONTEXT (fndecl)));
1804 :
1805 : /* If we've been asked to synthesize a clone, just synthesize the
1806 : cloned function instead. Doing so will automatically fill in the
1807 : body for the clone. */
1808 1228431 : if (DECL_CLONED_FUNCTION_P (fndecl))
1809 1119296 : fndecl = DECL_CLONED_FUNCTION (fndecl);
1810 :
1811 : /* We may be in the middle of deferred access check. Disable
1812 : it now. */
1813 1228431 : push_deferring_access_checks (dk_no_deferred);
1814 :
1815 1228431 : bool push_to_top = maybe_push_to_top_level (fndecl);
1816 :
1817 1228431 : input_location = DECL_SOURCE_LOCATION (fndecl);
1818 :
1819 1228431 : start_preparsed_function (fndecl, NULL_TREE, SF_DEFAULT | SF_PRE_PARSED);
1820 1228431 : stmt = begin_function_body ();
1821 :
1822 1228431 : if (DECL_ASSIGNMENT_OPERATOR_P (fndecl)
1823 1228431 : && DECL_OVERLOADED_OPERATOR_IS (fndecl, NOP_EXPR))
1824 : {
1825 47244 : do_build_copy_assign (fndecl);
1826 47244 : need_body = false;
1827 : }
1828 2362374 : else if (DECL_CONSTRUCTOR_P (fndecl))
1829 : {
1830 629300 : tree arg_chain = FUNCTION_FIRST_USER_PARMTYPE (fndecl);
1831 629300 : if (arg_chain != void_list_node)
1832 245589 : do_build_copy_constructor (fndecl);
1833 : else
1834 383711 : finish_mem_initializers (NULL_TREE);
1835 : }
1836 551887 : else if (sfk == sfk_comparison)
1837 : {
1838 : /* Pass tf_none so the function is just deleted if there's a problem. */
1839 61403 : build_comparison_op (fndecl, true, tf_none);
1840 61403 : need_body = false;
1841 : }
1842 :
1843 : /* If we haven't yet generated the body of the function, just
1844 : generate an empty compound statement. */
1845 737947 : if (need_body)
1846 : {
1847 1119784 : tree compound_stmt;
1848 1119784 : compound_stmt = begin_compound_stmt (BCS_FN_BODY);
1849 1119784 : finish_compound_stmt (compound_stmt);
1850 : }
1851 :
1852 1228431 : finish_function_body (stmt);
1853 1228431 : finish_function (/*inline_p=*/false);
1854 :
1855 : /* Remember that we were defined in this module. */
1856 1228431 : set_instantiating_module (fndecl);
1857 :
1858 1228431 : if (!DECL_DELETED_FN (fndecl))
1859 1228341 : expand_or_defer_fn (fndecl);
1860 :
1861 1228431 : input_location = save_input_location;
1862 :
1863 1228431 : maybe_pop_from_top_level (push_to_top);
1864 :
1865 1228431 : pop_deferring_access_checks ();
1866 :
1867 1228431 : if (error_count != errorcount || warning_count != warningcount + werrorcount)
1868 38 : if (DECL_ARTIFICIAL (fndecl))
1869 31 : inform (input_location, "synthesized method %qD first required here",
1870 : fndecl);
1871 1228431 : }
1872 :
1873 : /* Like synthesize_method, but don't actually synthesize defaulted comparison
1874 : methods if their class is still incomplete. Just deduce the return
1875 : type in that case. */
1876 :
1877 : void
1878 33934 : maybe_synthesize_method (tree fndecl)
1879 : {
1880 33934 : if (special_function_p (fndecl) == sfk_comparison)
1881 : {
1882 33934 : tree lhs = DECL_ARGUMENTS (fndecl);
1883 33934 : if (is_this_parameter (lhs))
1884 313 : lhs = cp_build_fold_indirect_ref (lhs);
1885 : else
1886 33621 : lhs = convert_from_reference (lhs);
1887 33934 : tree ctype = TYPE_MAIN_VARIANT (TREE_TYPE (lhs));
1888 33934 : if (!COMPLETE_TYPE_P (ctype))
1889 : {
1890 9 : push_deferring_access_checks (dk_no_deferred);
1891 9 : build_comparison_op (fndecl, false, tf_none);
1892 9 : pop_deferring_access_checks ();
1893 9 : return;
1894 : }
1895 : }
1896 33925 : return synthesize_method (fndecl);
1897 : }
1898 :
1899 : /* Build a reference to type TYPE with cv-quals QUALS, which is an
1900 : rvalue if RVALUE is true. */
1901 :
1902 : tree
1903 8742203 : build_stub_type (tree type, int quals, bool rvalue)
1904 : {
1905 8742203 : tree argtype = cp_build_qualified_type (type, quals);
1906 8742203 : return cp_build_reference_type (argtype, rvalue);
1907 : }
1908 :
1909 : /* Build a dummy glvalue from dereferencing a dummy reference of type
1910 : REFTYPE. */
1911 :
1912 : tree
1913 47263043 : build_stub_object (tree reftype)
1914 : {
1915 47263043 : if (!TYPE_REF_P (reftype))
1916 3767208 : reftype = cp_build_reference_type (reftype, /*rval*/true);
1917 47263043 : tree stub = build1 (CONVERT_EXPR, reftype, integer_one_node);
1918 47263043 : return convert_from_reference (stub);
1919 : }
1920 :
1921 : /* True iff EXPR is the result of build_stub_object. */
1922 :
1923 : bool
1924 1051277840 : is_stub_object (tree expr)
1925 : {
1926 1051277840 : if (!REFERENCE_REF_P (expr))
1927 : return false;
1928 98548699 : expr = TREE_OPERAND (expr, 0);
1929 98548699 : return (TREE_CODE (expr) == CONVERT_EXPR
1930 98548699 : && TREE_OPERAND (expr, 0) == integer_one_node);
1931 : }
1932 :
1933 : /* Build a std::declval<TYPE>() expression and return it. */
1934 :
1935 : static tree
1936 6089035 : build_trait_object (tree type, tsubst_flags_t complain)
1937 : {
1938 : /* TYPE can't be a function with cv-/ref-qualifiers: std::declval is
1939 : defined as
1940 :
1941 : template<class T>
1942 : typename std::add_rvalue_reference<T>::type declval() noexcept;
1943 :
1944 : and std::add_rvalue_reference yields T when T is a function with
1945 : cv- or ref-qualifiers, making the definition ill-formed. */
1946 6089035 : if (FUNC_OR_METHOD_TYPE_P (type)
1947 6089035 : && (type_memfn_quals (type) != TYPE_UNQUALIFIED
1948 210 : || type_memfn_rqual (type) != REF_QUAL_NONE))
1949 : {
1950 16 : if (complain & tf_error)
1951 3 : error ("object cannot have qualified function type %qT", type);
1952 16 : return error_mark_node;
1953 : }
1954 :
1955 6089019 : return build_stub_object (type);
1956 : }
1957 :
1958 : /* [func.require] Build an expression of INVOKE(FN_TYPE, ARG_TYPES...). If the
1959 : given is not invocable, returns error_mark_node, unless COMPLAIN includes
1960 : tf_error. */
1961 :
1962 : tree
1963 88832 : build_invoke (tree fn_type, const_tree arg_types, tsubst_flags_t complain)
1964 : {
1965 88832 : if (error_operand_p (fn_type) || error_operand_p (arg_types))
1966 0 : return error_mark_node;
1967 :
1968 88832 : gcc_assert (TYPE_P (fn_type));
1969 88832 : gcc_assert (TREE_CODE (arg_types) == TREE_VEC);
1970 :
1971 : /* Access check is required to determine if the given is invocable. */
1972 88832 : deferring_access_check_sentinel acs (dk_no_deferred);
1973 :
1974 : /* INVOKE is an unevaluated context. */
1975 88832 : cp_unevaluated cp_uneval_guard;
1976 :
1977 88832 : bool is_ptrdatamem;
1978 88832 : bool is_ptrmemfunc;
1979 88832 : if (TREE_CODE (fn_type) == REFERENCE_TYPE)
1980 : {
1981 64023 : tree non_ref_fn_type = TREE_TYPE (fn_type);
1982 64023 : is_ptrdatamem = TYPE_PTRDATAMEM_P (non_ref_fn_type);
1983 64023 : is_ptrmemfunc = TYPE_PTRMEMFUNC_P (non_ref_fn_type);
1984 :
1985 : /* Dereference fn_type if it is a pointer to member. */
1986 63858 : if (is_ptrdatamem || is_ptrmemfunc)
1987 : fn_type = non_ref_fn_type;
1988 : }
1989 : else
1990 : {
1991 24809 : is_ptrdatamem = TYPE_PTRDATAMEM_P (fn_type);
1992 24809 : is_ptrmemfunc = TYPE_PTRMEMFUNC_P (fn_type);
1993 : }
1994 :
1995 25793 : if (is_ptrdatamem && TREE_VEC_LENGTH (arg_types) != 1)
1996 : {
1997 40 : if (complain & tf_error)
1998 0 : error ("pointer to data member type %qT can only be invoked with "
1999 : "one argument", fn_type);
2000 40 : return error_mark_node;
2001 : }
2002 107601 : if (is_ptrmemfunc && TREE_VEC_LENGTH (arg_types) == 0)
2003 : {
2004 33 : if (complain & tf_error)
2005 0 : error ("pointer to member function type %qT must be invoked with "
2006 : "at least one argument", fn_type);
2007 33 : return error_mark_node;
2008 : }
2009 :
2010 : /* Construct an expression of a pointer to member. */
2011 88759 : tree ptrmem_expr;
2012 88759 : if (is_ptrdatamem || is_ptrmemfunc)
2013 : {
2014 19296 : tree datum_type = TREE_VEC_ELT (arg_types, 0);
2015 19296 : tree non_ref_datum_type = datum_type;
2016 19296 : if (TYPE_REF_P (datum_type))
2017 560 : non_ref_datum_type = TREE_TYPE (datum_type);
2018 :
2019 : /* datum must be a class type or a pointer to a class type. */
2020 694 : if (!CLASS_TYPE_P (non_ref_datum_type)
2021 19296 : && !(POINTER_TYPE_P (non_ref_datum_type)
2022 18489 : && CLASS_TYPE_P (TREE_TYPE (non_ref_datum_type))))
2023 : {
2024 119 : if (complain & tf_error)
2025 0 : error ("first argument type %qT of a pointer to member must be a "
2026 : "class type or a pointer to a class type", datum_type);
2027 119 : return error_mark_node;
2028 : }
2029 :
2030 : /* 1.1 & 1.4. */
2031 19177 : tree ptrmem_class_type = TYPE_PTRMEM_CLASS_TYPE (fn_type);
2032 19177 : const bool ptrmem_is_same_or_base_of_datum =
2033 19177 : (same_type_ignoring_top_level_qualifiers_p (ptrmem_class_type,
2034 : non_ref_datum_type)
2035 19177 : || (NON_UNION_CLASS_TYPE_P (ptrmem_class_type)
2036 18606 : && NON_UNION_CLASS_TYPE_P (non_ref_datum_type)
2037 123 : && DERIVED_FROM_P (ptrmem_class_type, non_ref_datum_type)));
2038 :
2039 18588 : bool datum_is_refwrap = false;
2040 18588 : if (!ptrmem_is_same_or_base_of_datum && CLASS_TYPE_P (non_ref_datum_type))
2041 : {
2042 105 : tree datum_decl = TYPE_NAME (TYPE_MAIN_VARIANT (non_ref_datum_type));
2043 105 : if (decl_in_std_namespace_p (datum_decl))
2044 : {
2045 55 : const_tree name = DECL_NAME (datum_decl);
2046 55 : if (name && (id_equal (name, "reference_wrapper")))
2047 : {
2048 : /* 1.2 & 1.5: Retrieve T& from std::reference_wrapper<T>,
2049 : i.e., decltype(datum.get()). */
2050 108 : datum_type =
2051 108 : TREE_VEC_ELT (TYPE_TI_ARGS (non_ref_datum_type), 0);
2052 54 : datum_type = cp_build_reference_type (datum_type, false);
2053 54 : datum_is_refwrap = true;
2054 : }
2055 : }
2056 : }
2057 :
2058 19177 : tree datum_expr = build_trait_object (datum_type, complain);
2059 19177 : if (!ptrmem_is_same_or_base_of_datum && !datum_is_refwrap)
2060 : /* 1.3 & 1.6: Try to dereference datum_expr. */
2061 18534 : datum_expr = build_x_indirect_ref (UNKNOWN_LOCATION, datum_expr,
2062 : RO_UNARY_STAR, NULL_TREE, complain);
2063 :
2064 19177 : if (error_operand_p (datum_expr))
2065 16 : return error_mark_node;
2066 :
2067 19161 : tree fn_expr = build_trait_object (fn_type, complain);
2068 19161 : ptrmem_expr = build_m_component_ref (datum_expr, fn_expr, complain);
2069 :
2070 19161 : if (error_operand_p (ptrmem_expr))
2071 42 : return error_mark_node;
2072 :
2073 19119 : if (is_ptrdatamem)
2074 : return ptrmem_expr;
2075 : }
2076 :
2077 : /* Construct expressions for arguments to INVOKE. For a pointer to member
2078 : function, the first argument, which is the object, is not arguments to
2079 : the function. */
2080 88133 : releasing_vec args;
2081 276306 : for (int i = is_ptrmemfunc ? 1 : 0; i < TREE_VEC_LENGTH (arg_types); ++i)
2082 : {
2083 100046 : tree arg_type = TREE_VEC_ELT (arg_types, i);
2084 100046 : tree arg = build_trait_object (arg_type, complain);
2085 100046 : if (error_operand_p (arg))
2086 6 : return error_mark_node;
2087 100040 : vec_safe_push (args, arg);
2088 : }
2089 :
2090 88127 : tree invoke_expr;
2091 88127 : if (is_ptrmemfunc)
2092 18670 : invoke_expr = build_offset_ref_call_from_tree (ptrmem_expr, &args,
2093 : complain);
2094 : else /* 1.7. */
2095 69457 : invoke_expr = finish_call_expr (build_trait_object (fn_type, complain),
2096 : &args, false, false, complain);
2097 : return invoke_expr;
2098 88832 : }
2099 :
2100 : /* Determine which function will be called when looking up NAME in TYPE,
2101 : called with a single ARGTYPE argument, or no argument if ARGTYPE is
2102 : null. FLAGS and COMPLAIN are as for build_new_method_call.
2103 :
2104 : Returns a FUNCTION_DECL if all is well.
2105 : Returns NULL_TREE if overload resolution failed.
2106 : Returns error_mark_node if the chosen function cannot be called. */
2107 :
2108 : static tree
2109 27047478 : locate_fn_flags (tree type, tree name, tree argtype, int flags,
2110 : tsubst_flags_t complain)
2111 : {
2112 27047478 : tree ob, fn, fns, binfo, rval;
2113 :
2114 27047478 : if (TYPE_P (type))
2115 12614661 : binfo = TYPE_BINFO (type);
2116 : else
2117 : {
2118 14432817 : binfo = type;
2119 14432817 : type = BINFO_TYPE (binfo);
2120 : }
2121 :
2122 27047478 : ob = build_stub_object (cp_build_reference_type (type, false));
2123 27047478 : releasing_vec args;
2124 27047478 : if (argtype)
2125 : {
2126 10227334 : if (TREE_CODE (argtype) == TREE_LIST)
2127 : {
2128 155836 : for (tree elt = argtype; elt && elt != void_list_node;
2129 89423 : elt = TREE_CHAIN (elt))
2130 : {
2131 89423 : tree type = TREE_VALUE (elt);
2132 89423 : tree arg = build_stub_object (type);
2133 89423 : vec_safe_push (args, arg);
2134 : }
2135 : }
2136 : else
2137 : {
2138 10160921 : tree arg = build_stub_object (argtype);
2139 10160921 : args->quick_push (arg);
2140 : }
2141 : }
2142 :
2143 27047478 : fns = lookup_fnfields (binfo, name, 0, complain);
2144 27047478 : rval = build_new_method_call (ob, fns, &args, binfo, flags, &fn, complain);
2145 :
2146 27047478 : if (fn && rval == error_mark_node)
2147 : return rval;
2148 : else
2149 26094598 : return fn;
2150 27047478 : }
2151 :
2152 : /* Locate the dtor of TYPE. */
2153 :
2154 : tree
2155 2017 : get_dtor (tree type, tsubst_flags_t complain)
2156 : {
2157 2017 : tree fn = locate_fn_flags (type, complete_dtor_identifier, NULL_TREE,
2158 : LOOKUP_NORMAL, complain);
2159 2017 : if (fn == error_mark_node)
2160 12 : return NULL_TREE;
2161 : return fn;
2162 : }
2163 :
2164 : /* Locate the default ctor of TYPE. */
2165 :
2166 : tree
2167 17612 : locate_ctor (tree type)
2168 : {
2169 17612 : tree fn;
2170 :
2171 17612 : push_deferring_access_checks (dk_no_check);
2172 17612 : fn = locate_fn_flags (type, complete_ctor_identifier, NULL_TREE,
2173 : LOOKUP_SPECULATIVE, tf_none);
2174 17612 : pop_deferring_access_checks ();
2175 17612 : if (fn == error_mark_node)
2176 176 : return NULL_TREE;
2177 : return fn;
2178 : }
2179 :
2180 : /* Likewise, but give any appropriate errors. */
2181 :
2182 : tree
2183 1255 : get_default_ctor (tree type)
2184 : {
2185 1255 : tree fn = locate_fn_flags (type, complete_ctor_identifier, NULL_TREE,
2186 : LOOKUP_NORMAL, tf_warning_or_error);
2187 1255 : if (fn == error_mark_node)
2188 3 : return NULL_TREE;
2189 : return fn;
2190 : }
2191 :
2192 : /* Locate the copy ctor of TYPE. */
2193 :
2194 : tree
2195 538 : get_copy_ctor (tree type, tsubst_flags_t complain)
2196 : {
2197 538 : int quals = (TYPE_HAS_CONST_COPY_CTOR (type)
2198 538 : ? TYPE_QUAL_CONST : TYPE_UNQUALIFIED);
2199 538 : tree argtype = build_stub_type (type, quals, false);
2200 538 : tree fn = locate_fn_flags (type, complete_ctor_identifier, argtype,
2201 : LOOKUP_NORMAL, complain);
2202 538 : if (fn == error_mark_node)
2203 6 : return NULL_TREE;
2204 : return fn;
2205 : }
2206 :
2207 : /* Locate the copy assignment operator of TYPE. */
2208 :
2209 : tree
2210 397 : get_copy_assign (tree type)
2211 : {
2212 397 : int quals = (TYPE_HAS_CONST_COPY_ASSIGN (type)
2213 397 : ? TYPE_QUAL_CONST : TYPE_UNQUALIFIED);
2214 397 : tree argtype = build_stub_type (type, quals, false);
2215 397 : tree fn = locate_fn_flags (type, assign_op_identifier, argtype,
2216 : LOOKUP_NORMAL, tf_warning_or_error);
2217 397 : if (fn == error_mark_node)
2218 3 : return NULL_TREE;
2219 : return fn;
2220 : }
2221 :
2222 : /* walk_tree helper function for is_trivially_xible. If *TP is a call,
2223 : return it if it calls something other than a trivial special member
2224 : function. */
2225 :
2226 : static tree
2227 241654 : check_nontriv (tree *tp, int *, void *)
2228 : {
2229 241654 : tree fn = cp_get_callee (*tp);
2230 241654 : if (fn == NULL_TREE)
2231 : return NULL_TREE;
2232 :
2233 7904 : if (TREE_CODE (fn) == ADDR_EXPR)
2234 7890 : fn = TREE_OPERAND (fn, 0);
2235 :
2236 7904 : if (TREE_CODE (fn) != FUNCTION_DECL
2237 7904 : || !trivial_fn_p (fn))
2238 7904 : return fn;
2239 : return NULL_TREE;
2240 : }
2241 :
2242 : /* Return declval<T>() = declval<U>() treated as an unevaluated operand. */
2243 :
2244 : static tree
2245 1430585 : assignable_expr (tree to, tree from, bool explain)
2246 : {
2247 1430585 : cp_unevaluated cp_uneval_guard;
2248 1430585 : tsubst_flags_t complain = explain ? tf_error : tf_none;
2249 :
2250 1430585 : to = build_trait_object (to, complain);
2251 1430585 : if (to == error_mark_node)
2252 : return error_mark_node;
2253 :
2254 1430585 : from = build_trait_object (from, complain);
2255 1430585 : if (from == error_mark_node)
2256 : return error_mark_node;
2257 :
2258 1430585 : tree r = cp_build_modify_expr (input_location, to, NOP_EXPR, from, complain);
2259 1430585 : return r;
2260 1430585 : }
2261 :
2262 : /* The predicate condition for a template specialization
2263 : is_constructible<T, Args...> shall be satisfied if and only if the
2264 : following variable definition would be well-formed for some invented
2265 : variable t: T t(create<Args>()...);
2266 :
2267 : Return something equivalent in well-formedness and triviality. */
2268 :
2269 : static tree
2270 3207713 : constructible_expr (tree to, tree from, bool explain)
2271 : {
2272 3207713 : tree expr;
2273 3207713 : cp_unevaluated cp_uneval_guard;
2274 3207713 : tsubst_flags_t complain = explain ? tf_error : tf_none;
2275 3207713 : const int len = TREE_VEC_LENGTH (from);
2276 3207713 : if (CLASS_TYPE_P (to))
2277 : {
2278 1429570 : if (abstract_virtuals_error (NULL_TREE, to, complain))
2279 6342 : return error_mark_node;
2280 1429498 : tree ctype = to;
2281 1429498 : vec<tree, va_gc> *args = NULL;
2282 1429498 : if (!TYPE_REF_P (to))
2283 1429498 : to = cp_build_reference_type (to, /*rval*/false);
2284 1429498 : tree ob = build_stub_object (to);
2285 1429498 : if (len == 0)
2286 482475 : expr = build_value_init (ctype, complain);
2287 : else
2288 : {
2289 947023 : vec_alloc (args, len);
2290 1899251 : for (tree arg : tree_vec_range (from))
2291 952228 : args->quick_push (build_stub_object (arg));
2292 947023 : expr = build_special_member_call (ob, complete_ctor_identifier, &args,
2293 : ctype, LOOKUP_NORMAL, complain);
2294 : }
2295 1429498 : if (expr == error_mark_node)
2296 : return error_mark_node;
2297 : /* The current state of the standard vis-a-vis LWG 2116 is that
2298 : is_*constructible involves destruction as well. */
2299 1423290 : if (type_build_dtor_call (ctype))
2300 : {
2301 282529 : tree dtor = build_special_member_call (ob, complete_dtor_identifier,
2302 : NULL, ctype, LOOKUP_NORMAL,
2303 : complain);
2304 282529 : if (dtor == error_mark_node)
2305 : return error_mark_node;
2306 282467 : if (!TYPE_HAS_TRIVIAL_DESTRUCTOR (ctype))
2307 272694 : expr = build2 (COMPOUND_EXPR, void_type_node, expr, dtor);
2308 : }
2309 : }
2310 : else
2311 : {
2312 1778143 : if (len == 0)
2313 284732 : return build_value_init (strip_array_types (to), complain);
2314 1493411 : if (len > 1)
2315 : {
2316 292 : if (cxx_dialect < cxx20)
2317 : {
2318 2 : if (explain)
2319 1 : error ("too many initializers for non-class type %qT", to);
2320 2 : return error_mark_node;
2321 : }
2322 :
2323 : /* In C++20 this is well-formed:
2324 : using T = int[2];
2325 : T t(1, 2);
2326 : which means that std::is_constructible_v<int[2], int, int>
2327 : should be true. */
2328 290 : vec<constructor_elt, va_gc> *v;
2329 290 : vec_alloc (v, len);
2330 870 : for (tree arg : tree_vec_range (from))
2331 : {
2332 580 : tree stub = build_stub_object (arg);
2333 580 : constructor_elt elt = { NULL_TREE, stub };
2334 580 : v->quick_push (elt);
2335 : }
2336 290 : from = build_constructor (init_list_type_node, v);
2337 290 : CONSTRUCTOR_IS_DIRECT_INIT (from) = true;
2338 290 : CONSTRUCTOR_IS_PAREN_INIT (from) = true;
2339 : }
2340 : else
2341 1493119 : from = build_stub_object (TREE_VEC_ELT (from, 0));
2342 :
2343 1493409 : tree orig_from = from;
2344 1493409 : expr = perform_direct_initialization_if_possible (to, from,
2345 : /*cast*/false,
2346 : complain);
2347 : /* If t(e) didn't work, maybe t{e} will. */
2348 1493409 : if (expr == NULL_TREE
2349 1493409 : && len == 1
2350 2950 : && cxx_dialect >= cxx20)
2351 : {
2352 2925 : from = build_constructor_single (init_list_type_node, NULL_TREE,
2353 : from);
2354 2925 : CONSTRUCTOR_IS_DIRECT_INIT (from) = true;
2355 2925 : CONSTRUCTOR_IS_PAREN_INIT (from) = true;
2356 2925 : expr = perform_direct_initialization_if_possible (to, from,
2357 : /*cast*/false,
2358 : complain);
2359 : }
2360 :
2361 1493409 : if (expr == NULL_TREE && explain)
2362 : {
2363 14 : if (len > 1)
2364 2 : error ("too many initializers for non-class type %qT", to);
2365 : else
2366 : {
2367 : /* Redo the implicit conversion for diagnostics. */
2368 12 : int count = errorcount + warningcount;
2369 12 : perform_implicit_conversion_flags (to, orig_from, complain,
2370 : LOOKUP_NORMAL);
2371 12 : if (count == errorcount + warningcount)
2372 : /* The message may have been suppressed due to -w + -fpermissive,
2373 : emit a generic response instead. */
2374 0 : error ("the conversion is invalid");
2375 : }
2376 : }
2377 : }
2378 : return expr;
2379 3207713 : }
2380 :
2381 : /* Valid if "Either T is a reference type, or T is a complete object type for
2382 : which the expression declval<U&>().~U() is well-formed when treated as an
2383 : unevaluated operand ([expr.context]), where U is remove_all_extents_t<T>."
2384 :
2385 : For a class U, return the destructor call; otherwise return void_node if
2386 : valid or error_mark_node if not. */
2387 :
2388 : static tree
2389 50797 : destructible_expr (tree to, bool explain)
2390 : {
2391 50797 : cp_unevaluated cp_uneval_guard;
2392 50797 : tsubst_flags_t complain = explain ? tf_error : tf_none;
2393 50797 : int flags = LOOKUP_NORMAL|LOOKUP_DESTRUCTOR;
2394 50797 : if (TYPE_REF_P (to))
2395 177 : return void_node;
2396 50620 : if (!COMPLETE_TYPE_P (complete_type (to)))
2397 : {
2398 39 : if (explain)
2399 0 : error_at (location_of (to), "%qT is incomplete", to);
2400 39 : return error_mark_node;
2401 : }
2402 50581 : to = strip_array_types (to);
2403 50581 : if (CLASS_TYPE_P (to))
2404 : {
2405 27687 : to = build_trait_object (to, complain);
2406 27687 : return build_delete (input_location, TREE_TYPE (to), to,
2407 27687 : sfk_complete_destructor, flags, 0, complain);
2408 : }
2409 : /* [expr.prim.id.dtor] If the id-expression names a pseudo-destructor, T
2410 : shall be a scalar type.... */
2411 22894 : else if (scalarish_type_p (to))
2412 22860 : return void_node;
2413 : else
2414 : {
2415 34 : if (explain)
2416 3 : error_at (location_of (to), "%qT is not a class or scalar type", to);
2417 34 : return error_mark_node;
2418 : }
2419 50797 : }
2420 :
2421 : /* Returns a tree iff TO is assignable (if CODE is MODIFY_EXPR) or
2422 : constructible (otherwise) from FROM, which is a single type for
2423 : assignment or a list of types for construction. If EXPLAIN is
2424 : set, emit a diagnostic explaining why the operation failed. */
2425 :
2426 : static tree
2427 4689664 : is_xible_helper (enum tree_code code, tree to, tree from, bool explain)
2428 : {
2429 4689664 : to = complete_type (to);
2430 4689664 : deferring_access_check_sentinel acs (dk_no_deferred);
2431 :
2432 4689664 : if (VOID_TYPE_P (to))
2433 : {
2434 274 : if (explain)
2435 42 : error_at (location_of (to), "%qT is incomplete", to);
2436 274 : return error_mark_node;
2437 : }
2438 4689390 : if (from
2439 4638593 : && FUNC_OR_METHOD_TYPE_P (from)
2440 4689436 : && (TYPE_READONLY (from) || FUNCTION_REF_QUALIFIED (from)))
2441 : {
2442 22 : if (explain)
2443 0 : error ("%qT is a qualified function type", from);
2444 22 : return error_mark_node;
2445 : }
2446 :
2447 4689368 : tree expr;
2448 4689368 : if (code == MODIFY_EXPR)
2449 1430585 : expr = assignable_expr (to, from, explain);
2450 3258783 : else if (code == BIT_NOT_EXPR)
2451 50797 : expr = destructible_expr (to, explain);
2452 3207986 : else if (TREE_CODE (to) == ARRAY_TYPE && !TYPE_DOMAIN (to))
2453 : {
2454 273 : if (explain)
2455 0 : error ("cannot construct an array of unknown bound");
2456 273 : return error_mark_node;
2457 : }
2458 : else
2459 3207713 : expr = constructible_expr (to, from, explain);
2460 : return expr;
2461 : }
2462 :
2463 : /* Returns true iff TO is trivially assignable (if CODE is MODIFY_EXPR) or
2464 : constructible (otherwise) from FROM, which is a single type for
2465 : assignment or a list of types for construction. If EXPLAIN, diagnose
2466 : why we returned false. */
2467 :
2468 : bool
2469 109924 : is_trivially_xible (enum tree_code code, tree to, tree from,
2470 : bool explain/*=false*/)
2471 : {
2472 109924 : tree expr = is_xible_helper (code, to, from, explain);
2473 109924 : if (expr == NULL_TREE || expr == error_mark_node)
2474 : return false;
2475 :
2476 108173 : tree nt = cp_walk_tree_without_duplicates (&expr, check_nontriv, NULL);
2477 108173 : if (explain && nt)
2478 12 : inform (location_of (nt), "%qE is non-trivial", nt);
2479 108173 : return !nt;
2480 : }
2481 :
2482 : /* Returns true iff TO is nothrow assignable (if CODE is MODIFY_EXPR) or
2483 : constructible (otherwise) from FROM, which is a single type for
2484 : assignment or a list of types for construction. If EXPLAIN, diagnose
2485 : why we returned false. */
2486 :
2487 : bool
2488 1349320 : is_nothrow_xible (enum tree_code code, tree to, tree from,
2489 : bool explain/*=false*/)
2490 : {
2491 1349320 : ++cp_noexcept_operand;
2492 1349320 : tree expr = is_xible_helper (code, to, from, explain);
2493 1349320 : --cp_noexcept_operand;
2494 1349320 : if (expr == NULL_TREE || expr == error_mark_node)
2495 : return false;
2496 :
2497 1348591 : bool is_noexcept = expr_noexcept_p (expr, tf_none);
2498 1348591 : if (explain && !is_noexcept)
2499 10 : explain_not_noexcept (expr);
2500 : return is_noexcept;
2501 : }
2502 :
2503 : /* Returns true iff TO is assignable (if CODE is MODIFY_EXPR) or
2504 : constructible (otherwise) from FROM, which is a single type for
2505 : assignment or a list of types for construction. If EXPLAIN, diagnose
2506 : why we returned false. */
2507 :
2508 : bool
2509 3230420 : is_xible (enum tree_code code, tree to, tree from, bool explain/*=false*/)
2510 : {
2511 3230420 : tree expr = is_xible_helper (code, to, from, explain);
2512 3230420 : if (expr == error_mark_node)
2513 : return false;
2514 3183512 : return !!expr;
2515 : }
2516 :
2517 : /* Return true iff conjunction_v<is_reference<T>, is_constructible<T, U>> is
2518 : true, and the initialization
2519 : T t(VAL<U>); // DIRECT_INIT_P
2520 : or
2521 : T t = VAL<U>; // !DIRECT_INIT_P
2522 : binds t to a temporary object whose lifetime is extended.
2523 : VAL<T> is defined in [meta.unary.prop]:
2524 : -- If T is a reference or function type, VAL<T> is an expression with the
2525 : same type and value category as declval<T>().
2526 : -- Otherwise, VAL<T> is a prvalue that initially has type T. */
2527 :
2528 : bool
2529 265102 : ref_xes_from_temporary (tree to, tree from, bool direct_init_p)
2530 : {
2531 : /* Check is_reference<T>. */
2532 265102 : if (!TYPE_REF_P (to))
2533 : return false;
2534 : /* We don't check is_constructible<T, U>: if T isn't constructible
2535 : from U, we won't be able to create a conversion. */
2536 12863 : tree val = build_trait_object (from, tf_none);
2537 12863 : if (val == error_mark_node)
2538 : return false;
2539 12863 : if (!TYPE_REF_P (from) && TREE_CODE (from) != FUNCTION_TYPE)
2540 451 : val = CLASS_TYPE_P (from) ? force_rvalue (val, tf_none) : rvalue (val);
2541 12863 : return ref_conv_binds_to_temporary (to, val, direct_init_p).is_true ();
2542 : }
2543 :
2544 : /* Worker for is_{,nothrow_}convertible. Attempt to perform an implicit
2545 : conversion from FROM to TO and return the result. If EXPLAIN, emit a
2546 : diagnostic about why the conversion failed. */
2547 :
2548 : static tree
2549 2979585 : is_convertible_helper (tree from, tree to, bool explain)
2550 : {
2551 2979585 : if (VOID_TYPE_P (from) && VOID_TYPE_P (to))
2552 36 : return integer_one_node;
2553 2979549 : cp_unevaluated u;
2554 2979549 : tsubst_flags_t complain = explain ? tf_error : tf_none;
2555 :
2556 : /* std::is_{,nothrow_}convertible test whether the imaginary function
2557 : definition
2558 :
2559 : To test() { return std::declval<From>(); }
2560 :
2561 : is well-formed. A function can't return a function. */
2562 2979549 : if (FUNC_OR_METHOD_TYPE_P (to))
2563 : {
2564 75 : if (explain)
2565 0 : error ("%qT is a function type", to);
2566 75 : return error_mark_node;
2567 : }
2568 :
2569 2979474 : tree expr = build_trait_object (from, complain);
2570 2979474 : if (expr == error_mark_node)
2571 : return error_mark_node;
2572 :
2573 2979468 : deferring_access_check_sentinel acs (dk_no_deferred);
2574 2979468 : return perform_implicit_conversion (to, expr, complain);
2575 2979549 : }
2576 :
2577 : /* Return true if FROM can be converted to TO using implicit conversions,
2578 : or both FROM and TO are possibly cv-qualified void. NB: This doesn't
2579 : implement the "Access checks are performed as if from a context unrelated
2580 : to either type" restriction. */
2581 :
2582 : bool
2583 2978912 : is_convertible (tree from, tree to, bool explain/*=false*/)
2584 : {
2585 2978912 : tree expr = is_convertible_helper (from, to, explain);
2586 2978912 : if (expr == error_mark_node)
2587 : return false;
2588 2698764 : return !!expr;
2589 : }
2590 :
2591 : /* Like is_convertible, but the conversion is also noexcept. */
2592 :
2593 : bool
2594 673 : is_nothrow_convertible (tree from, tree to, bool explain/*=false*/)
2595 : {
2596 673 : tree expr = is_convertible_helper (from, to, explain);
2597 673 : if (expr == NULL_TREE || expr == error_mark_node)
2598 : return false;
2599 :
2600 346 : bool is_noexcept = expr_noexcept_p (expr, tf_none);
2601 346 : if (explain && !is_noexcept)
2602 3 : explain_not_noexcept (expr);
2603 : return is_noexcept;
2604 : }
2605 :
2606 : /* Categorize various special_function_kinds. */
2607 : #define SFK_CTOR_P(sfk) \
2608 : ((sfk) >= sfk_constructor && (sfk) <= sfk_move_constructor)
2609 : #define SFK_DTOR_P(sfk) \
2610 : ((sfk) == sfk_destructor || (sfk) == sfk_virtual_destructor)
2611 : #define SFK_ASSIGN_P(sfk) \
2612 : ((sfk) == sfk_copy_assignment || (sfk) == sfk_move_assignment)
2613 : #define SFK_COPY_P(sfk) \
2614 : ((sfk) == sfk_copy_constructor || (sfk) == sfk_copy_assignment)
2615 : #define SFK_MOVE_P(sfk) \
2616 : ((sfk) == sfk_move_constructor || (sfk) == sfk_move_assignment)
2617 :
2618 : /* Subroutine of synthesized_method_walk. Update SPEC_P, TRIVIAL_P and
2619 : DELETED_P or give an error message MSG with argument ARG. */
2620 :
2621 : static void
2622 25606423 : process_subob_fn (tree fn, special_function_kind sfk, tree *spec_p,
2623 : bool *trivial_p, bool *deleted_p, bool *constexpr_p,
2624 : bool diag, tree arg, bool dtor_from_ctor = false)
2625 : {
2626 25606423 : if (!fn || fn == error_mark_node)
2627 : {
2628 965496 : if (deleted_p)
2629 965475 : *deleted_p = true;
2630 965496 : return;
2631 : }
2632 :
2633 24640927 : if (spec_p)
2634 : {
2635 3804497 : if (!maybe_instantiate_noexcept (fn))
2636 3 : *spec_p = error_mark_node;
2637 : else
2638 : {
2639 3804494 : tree raises = TYPE_RAISES_EXCEPTIONS (TREE_TYPE (fn));
2640 3804494 : *spec_p = merge_exception_specifiers (*spec_p, raises);
2641 : }
2642 : }
2643 :
2644 24640927 : if (!trivial_fn_p (fn) && !dtor_from_ctor)
2645 : {
2646 7095138 : if (trivial_p)
2647 4441964 : *trivial_p = false;
2648 7095138 : if (TREE_CODE (arg) == FIELD_DECL
2649 7095138 : && TREE_CODE (DECL_CONTEXT (arg)) == UNION_TYPE)
2650 : {
2651 4515 : if (deleted_p)
2652 4511 : *deleted_p = true;
2653 4515 : if (diag)
2654 25 : error ("union member %q+D with non-trivial %qD", arg, fn);
2655 : }
2656 : }
2657 :
2658 24640927 : if (constexpr_p && !DECL_DECLARED_CONSTEXPR_P (fn))
2659 : {
2660 2394339 : *constexpr_p = false;
2661 2394339 : if (diag)
2662 : {
2663 10 : inform (DECL_SOURCE_LOCATION (fn),
2664 10 : SFK_DTOR_P (sfk)
2665 : ? G_("defaulted destructor calls non-%<constexpr%> %qD")
2666 : : G_("defaulted constructor calls non-%<constexpr%> %qD"),
2667 : fn);
2668 10 : explain_invalid_constexpr_fn (fn);
2669 : }
2670 : }
2671 : }
2672 :
2673 : /* Subroutine of synthesized_method_walk to allow recursion into anonymous
2674 : aggregates. If DTOR_FROM_CTOR is true, we're walking subobject destructors
2675 : called from a synthesized constructor, in which case we don't consider
2676 : the triviality of the subobject destructor. */
2677 :
2678 : static void
2679 53785475 : walk_field_subobs (tree fields, special_function_kind sfk, tree fnname,
2680 : int quals, tree *spec_p, bool *trivial_p,
2681 : bool *deleted_p, bool *constexpr_p,
2682 : bool diag, int flags, tsubst_flags_t complain,
2683 : bool dtor_from_ctor)
2684 : {
2685 53785475 : if (!fields)
2686 : return;
2687 :
2688 53785471 : tree ctx = DECL_CONTEXT (fields);
2689 :
2690 : /* CWG2084: A defaulted default ctor for a union with a DMI only initializes
2691 : that member, so don't check other members. */
2692 53785471 : enum { unknown, no, yes }
2693 59465816 : only_dmi_mem = (sfk == sfk_constructor && TREE_CODE (ctx) == UNION_TYPE
2694 53785471 : ? unknown : no);
2695 53785471 : int has_user_provided_ctor = -1;
2696 :
2697 53832074 : again:
2698 972692647 : for (tree field = fields; field; field = DECL_CHAIN (field))
2699 : {
2700 919035571 : tree mem_type, argtype, rval;
2701 :
2702 1798439801 : if (TREE_CODE (field) != FIELD_DECL
2703 48173000 : || DECL_ARTIFICIAL (field)
2704 958677174 : || DECL_UNNAMED_BIT_FIELD (field))
2705 879404230 : continue;
2706 :
2707 : /* Variant members only affect deletedness. In particular, they don't
2708 : affect the exception-specification of a user-provided destructor,
2709 : which we're figuring out via get_defaulted_eh_spec. So if we aren't
2710 : asking if this is deleted, don't even look up the function; we don't
2711 : want an error about a deleted function we aren't actually calling. */
2712 39631341 : if (sfk == sfk_destructor && deleted_p == NULL
2713 2918334 : && TREE_CODE (ctx) == UNION_TYPE)
2714 : break;
2715 :
2716 39456343 : if (only_dmi_mem != no)
2717 : {
2718 123501 : if (DECL_INITIAL (field))
2719 : only_dmi_mem = yes;
2720 : else
2721 : /* Don't check this until we know there's no DMI. */
2722 123283 : continue;
2723 : }
2724 :
2725 39333060 : mem_type = strip_array_types (TREE_TYPE (field));
2726 39333060 : if (SFK_ASSIGN_P (sfk))
2727 : {
2728 4149592 : bool bad = true;
2729 4149592 : if (CP_TYPE_CONST_P (mem_type) && !CLASS_TYPE_P (mem_type))
2730 : {
2731 90 : if (diag)
2732 7 : error ("non-static const member %q#D, cannot use default "
2733 : "assignment operator", field);
2734 : }
2735 4149502 : else if (TYPE_REF_P (mem_type))
2736 : {
2737 1546 : if (diag)
2738 2 : error ("non-static reference member %q#D, cannot use "
2739 : "default assignment operator", field);
2740 : }
2741 : else
2742 : bad = false;
2743 :
2744 4149592 : if (bad && deleted_p)
2745 1636 : *deleted_p = true;
2746 : }
2747 35183468 : else if (sfk == sfk_constructor || sfk == sfk_inheriting_constructor)
2748 : {
2749 3171962 : bool bad;
2750 :
2751 3171962 : if (DECL_INITIAL (field))
2752 : {
2753 1012233 : if (diag && DECL_INITIAL (field) == error_mark_node)
2754 0 : inform (DECL_SOURCE_LOCATION (field),
2755 : "initializer for %q#D is invalid", field);
2756 1012233 : if (trivial_p)
2757 876784 : *trivial_p = false;
2758 : /* Core 1351: If the field has an NSDMI that could throw, the
2759 : default constructor is noexcept(false). */
2760 1012233 : if (spec_p)
2761 : {
2762 137351 : tree nsdmi = get_nsdmi (field, /*ctor*/false, complain);
2763 137351 : if (nsdmi == error_mark_node)
2764 120 : *spec_p = error_mark_node;
2765 137231 : else if (*spec_p != error_mark_node
2766 137231 : && !expr_noexcept_p (nsdmi, tf_none))
2767 1212 : *spec_p = noexcept_false_spec;
2768 : }
2769 : /* Don't do the normal processing. */
2770 1012233 : continue;
2771 1012233 : }
2772 :
2773 2159729 : bad = false;
2774 2159729 : if (CP_TYPE_CONST_P (mem_type)
2775 1401 : && TREE_CODE (ctx) != UNION_TYPE
2776 2161111 : && default_init_uninitialized_part (mem_type))
2777 : {
2778 1358 : if (diag)
2779 : {
2780 49 : error ("uninitialized const member in %q#T",
2781 : current_class_type);
2782 49 : inform (DECL_SOURCE_LOCATION (field),
2783 : "%q#D should be initialized", field);
2784 : }
2785 : bad = true;
2786 : }
2787 2158371 : else if (TYPE_REF_P (mem_type))
2788 : {
2789 9592 : if (diag)
2790 : {
2791 48 : error ("uninitialized reference member in %q#T",
2792 : current_class_type);
2793 48 : inform (DECL_SOURCE_LOCATION (field),
2794 : "%q#D should be initialized", field);
2795 : }
2796 : bad = true;
2797 : }
2798 :
2799 2159729 : if (bad && deleted_p)
2800 10950 : *deleted_p = true;
2801 :
2802 : /* Before C++20, for an implicitly-defined default constructor to
2803 : be constexpr, every member must have a user-provided default
2804 : constructor or an explicit initializer. */
2805 2159729 : if (constexpr_p
2806 1970170 : && cxx_dialect < cxx20
2807 84572 : && !CLASS_TYPE_P (mem_type)
2808 2234337 : && TREE_CODE (ctx) != UNION_TYPE)
2809 : {
2810 68923 : *constexpr_p = false;
2811 68923 : if (diag)
2812 2 : inform (DECL_SOURCE_LOCATION (field),
2813 : "defaulted default constructor does not "
2814 : "initialize %q#D", field);
2815 : }
2816 : }
2817 32011506 : else if (sfk == sfk_copy_constructor)
2818 : {
2819 : /* 12.8p11b5 */
2820 5351056 : if (TYPE_REF_P (mem_type)
2821 5351056 : && TYPE_REF_IS_RVALUE (mem_type))
2822 : {
2823 356 : if (diag)
2824 3 : error ("copying non-static data member %q#D of rvalue "
2825 : "reference type", field);
2826 356 : if (deleted_p)
2827 356 : *deleted_p = true;
2828 : }
2829 : }
2830 :
2831 38320827 : if (!CLASS_TYPE_P (mem_type))
2832 26861222 : continue;
2833 :
2834 11459605 : if (ANON_AGGR_TYPE_P (mem_type))
2835 : {
2836 266114 : walk_field_subobs (TYPE_FIELDS (mem_type), sfk, fnname, quals,
2837 : spec_p, trivial_p, deleted_p, constexpr_p,
2838 : diag, flags, complain, dtor_from_ctor);
2839 266114 : continue;
2840 : }
2841 :
2842 11193491 : if (SFK_COPY_P (sfk) || SFK_MOVE_P (sfk))
2843 : {
2844 4225911 : int mem_quals = cp_type_quals (mem_type) | quals;
2845 4225911 : if (DECL_MUTABLE_P (field))
2846 248 : mem_quals &= ~TYPE_QUAL_CONST;
2847 4225911 : argtype = build_stub_type (mem_type, mem_quals, SFK_MOVE_P (sfk));
2848 4225911 : }
2849 : else
2850 : argtype = NULL_TREE;
2851 :
2852 11193491 : if (cxx_dialect >= cxx26 && TREE_CODE (ctx) == UNION_TYPE)
2853 : {
2854 : /* C++26 [class.default.ctor]/2:
2855 : A defaulted default constructor for class X is defined as deleted
2856 : if
2857 : ...
2858 : - any non-variant potentially constructed subobject, except for
2859 : a non-static data member with a brace-or-equal-initializer, has
2860 : class type M (or possibly multidimensional array thereof) and
2861 : overload resolution as applied to find M's corresponding
2862 : constructor does not result in a usable candidate,
2863 : So, for C++26 this ignores default constructors of variant
2864 : members. */
2865 58004 : if (sfk == sfk_constructor || sfk == sfk_inheriting_constructor)
2866 1150 : continue;
2867 :
2868 : /* C++26 [class.default.ctor]/2:
2869 : ...
2870 : - any potentially constructed subobject S has class type M (or
2871 : possibly multidimensional array thereof), M has a destructor
2872 : that is deleted or inaccessible from the defaulted default
2873 : constructor, and either S is non-variant or S has a default
2874 : member initializer.
2875 : This is the dtor_from_ctor case, so ignore destructors of
2876 : variant members unless they have a DMI.
2877 : C++26 with CWG3189 [class.dtor]/4:
2878 : A defaulted destructor for a class X is defined as deleted if
2879 : ...
2880 : - X is has a non-union class and any non-variant potentially
2881 : constructed subobject has S of class type M (or possibly
2882 : multidimensional array thereof) where either
2883 : - S is not a variant member and M has a destructor that is
2884 : deleted or is inaccessible from the defaulted destructor, or
2885 : - S is a variant member, M has a destructor that is deleted,
2886 : inaccessible from the defaulted destructor, or non-trivial,
2887 : and either
2888 : - V S has a default member initializer or
2889 : - X has a user-provided constructor.
2890 : This is the !dtor_from_ctor case, so ignore destructors of
2891 : variant members unless they have a DMI or X has user-provided
2892 : constructor. */
2893 56854 : if (sfk == sfk_destructor)
2894 : {
2895 25008 : if (!dtor_from_ctor && has_user_provided_ctor == -1)
2896 5329 : has_user_provided_ctor
2897 5329 : = type_has_user_provided_constructor (current_class_type);
2898 25008 : if (DECL_INITIAL (field) == NULL_TREE
2899 25008 : && (dtor_from_ctor || !has_user_provided_ctor))
2900 18735 : continue;
2901 : }
2902 : }
2903 :
2904 11173606 : rval = locate_fn_flags (mem_type, fnname, argtype, flags, complain);
2905 :
2906 11173606 : process_subob_fn (rval, sfk, spec_p, trivial_p, deleted_p,
2907 : constexpr_p, diag, field, dtor_from_ctor);
2908 : }
2909 :
2910 : /* We didn't find a DMI in this union, now check all the members. */
2911 53832074 : if (only_dmi_mem == unknown)
2912 : {
2913 46603 : only_dmi_mem = no;
2914 46603 : goto again;
2915 : }
2916 : }
2917 :
2918 : /* Base walker helper for synthesized_method_walk. Inspect a direct
2919 : or virtual base. BINFO is the parent type's binfo. BASE_BINFO is
2920 : the base binfo of interests. All other parms are as for
2921 : synthesized_method_walk, or its local vars. */
2922 :
2923 : static tree
2924 9809316 : synthesized_method_base_walk (tree binfo, tree base_binfo,
2925 : special_function_kind sfk, tree fnname, int quals,
2926 : tree *inheriting_ctor, tree inherited_parms,
2927 : int flags, bool diag,
2928 : tree *spec_p, bool *trivial_p,
2929 : bool *deleted_p, bool *constexpr_p)
2930 : {
2931 9809316 : bool inherited_binfo = false;
2932 9809316 : tree argtype = NULL_TREE;
2933 9809316 : deferring_kind defer = dk_no_deferred;
2934 :
2935 9809316 : if (SFK_COPY_P (sfk) || SFK_MOVE_P (sfk))
2936 4514839 : argtype = build_stub_type (BINFO_TYPE (base_binfo), quals, SFK_MOVE_P (sfk));
2937 5294477 : else if (inheriting_ctor
2938 5294477 : && (inherited_binfo
2939 5294477 : = binfo_inherited_from (binfo, base_binfo, *inheriting_ctor)))
2940 : {
2941 66440 : argtype = inherited_parms;
2942 : /* Don't check access on the inherited constructor. */
2943 66440 : if (flag_new_inheriting_ctors)
2944 : defer = dk_deferred;
2945 : }
2946 5204557 : else if (cxx_dialect >= cxx14 && sfk == sfk_virtual_destructor
2947 1612670 : && BINFO_VIRTUAL_P (base_binfo)
2948 5403883 : && ABSTRACT_CLASS_TYPE_P (BINFO_TYPE (binfo)))
2949 : /* Don't check access when looking at vbases of abstract class's
2950 : virtual destructor. */
2951 : defer = dk_no_check;
2952 :
2953 4514839 : if (defer != dk_no_deferred)
2954 66569 : push_deferring_access_checks (defer);
2955 19618425 : tree rval = locate_fn_flags (base_binfo, fnname, argtype, flags,
2956 : diag ? tf_warning_or_error : tf_none);
2957 9809316 : if (defer != dk_no_deferred)
2958 66569 : pop_deferring_access_checks ();
2959 :
2960 : /* Replace an inherited template with the appropriate specialization. */
2961 9809316 : if (inherited_binfo && rval
2962 66440 : && DECL_P (*inheriting_ctor) && DECL_P (rval)
2963 9875273 : && DECL_CONTEXT (*inheriting_ctor) == DECL_CONTEXT (rval))
2964 65945 : *inheriting_ctor = DECL_CLONED_FUNCTION (rval);
2965 :
2966 19618632 : process_subob_fn (rval, sfk, spec_p, trivial_p, deleted_p,
2967 9809316 : constexpr_p, diag, BINFO_TYPE (base_binfo));
2968 9809316 : if (SFK_CTOR_P (sfk)
2969 14442291 : && (!BINFO_VIRTUAL_P (base_binfo)
2970 58337 : || TYPE_HAS_NONTRIVIAL_DESTRUCTOR (BINFO_TYPE (base_binfo))))
2971 : {
2972 : /* In a constructor we also need to check the subobject
2973 : destructors for cleanup of partially constructed objects. */
2974 4623501 : tree dtor = locate_fn_flags (base_binfo, complete_dtor_identifier,
2975 : NULL_TREE, flags,
2976 : diag ? tf_warning_or_error : tf_none);
2977 : /* Note that we don't pass down trivial_p; the subobject
2978 : destructors don't affect triviality of the constructor. Nor
2979 : do they affect constexpr-ness (a constant expression doesn't
2980 : throw) or exception-specification (a throw from one of the
2981 : dtors would be a double-fault). */
2982 9247002 : process_subob_fn (dtor, sfk, NULL, NULL, deleted_p, NULL, false,
2983 4623501 : BINFO_TYPE (base_binfo), /*dtor_from_ctor*/true);
2984 : }
2985 :
2986 9809316 : return rval;
2987 : }
2988 :
2989 : /* The caller wants to generate an implicit declaration of SFK for
2990 : CTYPE which is const if relevant and CONST_P is set. If SPEC_P,
2991 : TRIVIAL_P, DELETED_P or CONSTEXPR_P are non-null, set their
2992 : referent appropriately. If DIAG is true, we're either being called
2993 : from maybe_explain_implicit_delete to give errors, or if
2994 : CONSTEXPR_P is non-null, from explain_invalid_constexpr_fn. */
2995 :
2996 : static void
2997 34617416 : synthesized_method_walk (tree ctype, special_function_kind sfk, bool const_p,
2998 : tree *spec_p, bool *trivial_p, bool *deleted_p,
2999 : bool *constexpr_p, bool diag,
3000 : tree *inheriting_ctor, tree inherited_parms)
3001 : {
3002 34617416 : tree binfo, base_binfo;
3003 34617416 : int i;
3004 :
3005 : /* SFK must be exactly one category. */
3006 34617416 : gcc_checking_assert (SFK_DTOR_P(sfk) + SFK_CTOR_P(sfk)
3007 : + SFK_ASSIGN_P(sfk) == 1);
3008 :
3009 34617416 : if (spec_p)
3010 4052958 : *spec_p = (cxx_dialect >= cxx11 ? noexcept_true_spec : empty_except_spec);
3011 :
3012 34617416 : if (deleted_p)
3013 : {
3014 : /* "The closure type associated with a lambda-expression has a deleted
3015 : default constructor and a deleted copy assignment operator."
3016 : This is diagnosed in maybe_explain_implicit_delete.
3017 : In C++20, only lambda-expressions with lambda-captures have those
3018 : deleted. */
3019 60693952 : if (LAMBDA_TYPE_P (ctype)
3020 919738 : && (sfk == sfk_constructor || sfk == sfk_copy_assignment)
3021 30845321 : && (cxx_dialect < cxx20
3022 377408 : || LAMBDA_EXPR_CAPTURE_LIST (CLASSTYPE_LAMBDA_EXPR (ctype))
3023 44304 : || LAMBDA_EXPR_DEFAULT_CAPTURE_MODE
3024 44304 : (CLASSTYPE_LAMBDA_EXPR (ctype)) != CPLD_NONE))
3025 : {
3026 147749 : *deleted_p = true;
3027 147749 : return;
3028 : }
3029 :
3030 30505881 : *deleted_p = false;
3031 : }
3032 :
3033 34469667 : bool check_vdtor = false;
3034 34469667 : tree fnname;
3035 :
3036 34469667 : if (SFK_DTOR_P (sfk))
3037 : {
3038 10847158 : check_vdtor = true;
3039 : /* The synthesized method will call base dtors, but check complete
3040 : here to avoid having to deal with VTT. */
3041 10847158 : fnname = complete_dtor_identifier;
3042 : }
3043 23622509 : else if (SFK_ASSIGN_P (sfk))
3044 4547756 : fnname = assign_op_identifier;
3045 : else
3046 19074753 : fnname = complete_ctor_identifier;
3047 :
3048 68872915 : gcc_assert ((sfk == sfk_inheriting_constructor)
3049 : == (inheriting_ctor && *inheriting_ctor != NULL_TREE));
3050 :
3051 : /* If that user-written default constructor would satisfy the
3052 : requirements of a constexpr constructor (7.1.5), the
3053 : implicitly-defined default constructor is constexpr.
3054 :
3055 : C++20:
3056 : The implicitly-defined copy/move assignment operator is constexpr if
3057 : - X is a literal type, and
3058 : - the assignment operator selected to copy/move each direct base class
3059 : subobject is a constexpr function, and
3060 : - for each non-static data member of X that is of class type (or array
3061 : thereof), the assignment operator selected to copy/move that
3062 : member is a constexpr function.
3063 :
3064 : C++23:
3065 : The implicitly-defined copy/move assignment operator is constexpr. */
3066 34469667 : if (constexpr_p)
3067 30505349 : *constexpr_p = (SFK_CTOR_P (sfk)
3068 12215852 : || (SFK_ASSIGN_P (sfk) && cxx_dialect >= cxx14)
3069 38433514 : || (SFK_DTOR_P (sfk) && cxx_dialect >= cxx20));
3070 :
3071 34469667 : bool expected_trivial = type_has_trivial_fn (ctype, sfk);
3072 34469667 : if (trivial_p)
3073 30505332 : *trivial_p = expected_trivial;
3074 :
3075 : /* The TYPE_HAS_COMPLEX_* flags tell us about constraints from base
3076 : class versions and other properties of the type. But a subobject
3077 : class can be trivially copyable and yet have overload resolution
3078 : choose a template constructor for initialization, depending on
3079 : rvalueness and cv-quals. And furthermore, a member in a base might
3080 : be trivial but deleted or otherwise not callable. So we can't exit
3081 : early in C++0x. The same considerations apply in C++98/03, but
3082 : there the definition of triviality does not consider overload
3083 : resolution, so a constructor can be trivial even if it would otherwise
3084 : call a non-trivial constructor. */
3085 34469667 : if (expected_trivial
3086 26591110 : && (!(SFK_COPY_P (sfk) || SFK_MOVE_P (sfk)) || cxx_dialect < cxx11))
3087 : {
3088 11661734 : if (constexpr_p && sfk == sfk_constructor)
3089 : {
3090 3891186 : bool cx = trivial_default_constructor_is_constexpr (ctype);
3091 3891186 : *constexpr_p = cx;
3092 3891186 : if (diag && !cx && TREE_CODE (ctype) == UNION_TYPE)
3093 : /* A trivial constructor doesn't have any NSDMI. */
3094 2 : inform (input_location, "defaulted default constructor does "
3095 : "not initialize any non-static data member");
3096 : }
3097 11661734 : if (!diag && cxx_dialect < cxx11)
3098 : return;
3099 : }
3100 :
3101 34455598 : bool push_to_top = maybe_push_to_top_level (TYPE_NAME (ctype));
3102 34455598 : ++cp_unevaluated_operand;
3103 34455598 : ++c_inhibit_evaluation_warnings;
3104 34455598 : push_deferring_access_checks (dk_no_deferred);
3105 :
3106 34455598 : tree scope = push_scope (ctype);
3107 :
3108 34455598 : int flags = LOOKUP_NORMAL | LOOKUP_SPECULATIVE;
3109 34455598 : if (sfk != sfk_inheriting_constructor)
3110 34389179 : flags |= LOOKUP_DEFAULTED;
3111 :
3112 34455598 : tsubst_flags_t complain = diag ? tf_warning_or_error : tf_none;
3113 34455598 : if (diag && spec_p)
3114 : /* We're in get_defaulted_eh_spec; we don't actually want any walking
3115 : diagnostics, we just want complain set. */
3116 3589880 : diag = false;
3117 34455598 : int quals = const_p ? TYPE_QUAL_CONST : TYPE_UNQUALIFIED;
3118 :
3119 44060036 : for (binfo = TYPE_BINFO (ctype), i = 0;
3120 44060036 : BINFO_BASE_ITERATE (binfo, i, base_binfo); ++i)
3121 : {
3122 9604438 : if (!SFK_ASSIGN_P (sfk) && BINFO_VIRTUAL_P (base_binfo))
3123 : /* We'll handle virtual bases below. */
3124 57042 : continue;
3125 :
3126 9547396 : tree fn = synthesized_method_base_walk (binfo, base_binfo,
3127 : sfk, fnname, quals,
3128 : inheriting_ctor, inherited_parms,
3129 : flags, diag, spec_p, trivial_p,
3130 : deleted_p, constexpr_p);
3131 :
3132 199 : if (diag && SFK_ASSIGN_P (sfk) && SFK_MOVE_P (sfk)
3133 91 : && BINFO_VIRTUAL_P (base_binfo)
3134 34 : && fn && TREE_CODE (fn) == FUNCTION_DECL
3135 34 : && move_fn_p (fn) && !trivial_fn_p (fn)
3136 21 : && vbase_has_user_provided_move_assign (BINFO_TYPE (base_binfo))
3137 9547414 : && warning_enabled_at (DECL_SOURCE_LOCATION (fn),
3138 18 : OPT_Wvirtual_move_assign))
3139 12 : warning (OPT_Wvirtual_move_assign,
3140 : "defaulted move assignment for %qT calls a non-trivial "
3141 : "move assignment operator for virtual base %qT",
3142 12 : ctype, BINFO_TYPE (base_binfo));
3143 :
3144 9547396 : if (check_vdtor && type_has_virtual_destructor (BINFO_TYPE (base_binfo)))
3145 : {
3146 : /* Unlike for base ctor/op=/dtor, for operator delete it's fine
3147 : to have a null fn (no class-specific op delete). */
3148 1419231 : fn = locate_fn_flags (ctype, ovl_op_identifier (false, DELETE_EXPR),
3149 : ptr_type_node, flags, tf_none);
3150 1419231 : if (fn && fn == error_mark_node)
3151 : {
3152 21 : if (complain & tf_error)
3153 5 : locate_fn_flags (ctype, ovl_op_identifier (false, DELETE_EXPR),
3154 : ptr_type_node, flags, complain);
3155 21 : if (deleted_p)
3156 16 : *deleted_p = true;
3157 : }
3158 : check_vdtor = false;
3159 : }
3160 : }
3161 :
3162 34455598 : vec<tree, va_gc> *vbases = CLASSTYPE_VBASECLASSES (ctype);
3163 34455598 : if (SFK_ASSIGN_P (sfk))
3164 : /* Already examined vbases above. */;
3165 29909225 : else if (vec_safe_is_empty (vbases))
3166 : /* No virtual bases to worry about. */;
3167 189629 : else if (ABSTRACT_CLASS_TYPE_P (ctype) && cxx_dialect >= cxx14
3168 : /* DR 1658 specifies that vbases of abstract classes are
3169 : ignored for both ctors and dtors. Except DR 2336
3170 : overrides that skipping when determining the eh-spec of a
3171 : virtual destructor. */
3172 190009 : && sfk != sfk_virtual_destructor)
3173 : /* Vbase cdtors are not relevant. */;
3174 : else
3175 : {
3176 189287 : if (constexpr_p && cxx_dialect < cxx26)
3177 8569 : *constexpr_p = false;
3178 :
3179 451207 : FOR_EACH_VEC_ELT (*vbases, i, base_binfo)
3180 261920 : synthesized_method_base_walk (binfo, base_binfo, sfk, fnname, quals,
3181 : inheriting_ctor, inherited_parms,
3182 : flags, diag,
3183 : spec_p, trivial_p, deleted_p, constexpr_p);
3184 : }
3185 :
3186 : /* Now handle the non-static data members. */
3187 34455598 : walk_field_subobs (TYPE_FIELDS (ctype), sfk, fnname, quals,
3188 : spec_p, trivial_p, deleted_p, constexpr_p,
3189 : diag, flags, complain, /*dtor_from_ctor*/false);
3190 34455598 : if (SFK_CTOR_P (sfk))
3191 19063763 : walk_field_subobs (TYPE_FIELDS (ctype), sfk_destructor,
3192 : complete_dtor_identifier, TYPE_UNQUALIFIED,
3193 : NULL, NULL, deleted_p, NULL,
3194 : false, flags, complain, /*dtor_from_ctor*/true);
3195 :
3196 34455598 : pop_scope (scope);
3197 :
3198 34455598 : pop_deferring_access_checks ();
3199 34455598 : --cp_unevaluated_operand;
3200 34455598 : --c_inhibit_evaluation_warnings;
3201 34455598 : maybe_pop_from_top_level (push_to_top);
3202 : }
3203 :
3204 : /* DECL is a defaulted function whose exception specification is now
3205 : needed. Return what it should be. */
3206 :
3207 : tree
3208 3963684 : get_defaulted_eh_spec (tree decl, tsubst_flags_t complain)
3209 : {
3210 : /* For DECL_MAYBE_DELETED this should already have been handled by
3211 : synthesize_method. */
3212 3963684 : gcc_assert (!DECL_MAYBE_DELETED (decl));
3213 :
3214 3963684 : if (DECL_CLONED_FUNCTION_P (decl))
3215 0 : decl = DECL_CLONED_FUNCTION (decl);
3216 3963684 : special_function_kind sfk = special_function_p (decl);
3217 3963684 : tree ctype = DECL_CONTEXT (decl);
3218 3963684 : tree parms = FUNCTION_FIRST_USER_PARMTYPE (decl);
3219 3963684 : tree parm_type = TREE_VALUE (parms);
3220 3963684 : bool const_p = CP_TYPE_CONST_P (non_reference (parm_type));
3221 3963684 : tree spec = empty_except_spec;
3222 3963684 : bool diag = !DECL_DELETED_FN (decl) && (complain & tf_error);
3223 7927368 : tree inh = DECL_INHERITED_CTOR (decl);
3224 3963684 : if (SFK_DTOR_P (sfk) && DECL_VIRTUAL_P (decl))
3225 : /* We have to examine virtual bases even if abstract. */
3226 : sfk = sfk_virtual_destructor;
3227 3963684 : bool pushed = false;
3228 3963684 : if (CLASSTYPE_TEMPLATE_INSTANTIATION (ctype))
3229 2562936 : pushed = push_tinst_level (decl);
3230 3963684 : synthesized_method_walk (ctype, sfk, const_p, &spec, NULL, NULL,
3231 : NULL, diag, &inh, parms);
3232 3963684 : if (pushed)
3233 2562637 : pop_tinst_level ();
3234 3963684 : return spec;
3235 : }
3236 :
3237 : /* DECL is a deleted function. If it's implicitly deleted, explain why and
3238 : return true; else return false. */
3239 :
3240 : bool
3241 2399 : maybe_explain_implicit_delete (tree decl)
3242 : {
3243 : /* If decl is a clone, get the primary variant. */
3244 2399 : decl = DECL_ORIGIN (decl);
3245 2399 : gcc_assert (DECL_DELETED_FN (decl));
3246 2399 : if (DECL_DEFAULTED_FN (decl))
3247 : {
3248 : /* Not marked GTY; it doesn't need to be GC'd or written to PCH. */
3249 1738 : static hash_set<tree> *explained;
3250 :
3251 1738 : special_function_kind sfk;
3252 1738 : location_t loc;
3253 1738 : bool informed;
3254 1738 : tree ctype;
3255 :
3256 1738 : if (!explained)
3257 240 : explained = new hash_set<tree>;
3258 1738 : if (explained->add (decl))
3259 : return true;
3260 :
3261 465 : sfk = special_function_p (decl);
3262 465 : ctype = DECL_CONTEXT (decl);
3263 465 : loc = input_location;
3264 465 : input_location = DECL_SOURCE_LOCATION (decl);
3265 :
3266 465 : informed = false;
3267 903 : if (LAMBDA_TYPE_P (ctype))
3268 : {
3269 36 : informed = true;
3270 36 : if (sfk == sfk_constructor)
3271 19 : inform (DECL_SOURCE_LOCATION (decl),
3272 : "a lambda closure type has a deleted default constructor");
3273 17 : else if (sfk == sfk_copy_assignment)
3274 17 : inform (DECL_SOURCE_LOCATION (decl),
3275 : "a lambda closure type has a deleted copy assignment operator");
3276 : else
3277 : informed = false;
3278 : }
3279 429 : else if (DECL_ARTIFICIAL (decl)
3280 330 : && (sfk == sfk_copy_assignment || sfk == sfk_copy_constructor)
3281 544 : && classtype_has_move_assign_or_move_ctor_p (ctype, true))
3282 : {
3283 74 : inform (DECL_SOURCE_LOCATION (decl),
3284 : "%q#D is implicitly declared as deleted because %qT "
3285 : "declares a move constructor or move assignment operator",
3286 : decl, ctype);
3287 74 : informed = true;
3288 : }
3289 355 : else if (sfk == sfk_inheriting_constructor)
3290 : {
3291 18 : tree binfo = inherited_ctor_binfo (decl);
3292 18 : if (TREE_CODE (binfo) != TREE_BINFO)
3293 : {
3294 3 : inform (DECL_SOURCE_LOCATION (decl),
3295 : "%q#D inherits from multiple base subobjects",
3296 : decl);
3297 3 : informed = true;
3298 : }
3299 : }
3300 465 : if (!informed && sfk == sfk_comparison)
3301 : {
3302 76 : inform (DECL_SOURCE_LOCATION (decl),
3303 : "%q#D is implicitly deleted because the default "
3304 : "definition would be ill-formed:", decl);
3305 76 : build_comparison_op (decl, false, tf_warning_or_error);
3306 : }
3307 389 : else if (!informed)
3308 : {
3309 276 : tree parms = FUNCTION_FIRST_USER_PARMTYPE (decl);
3310 276 : bool const_p = false;
3311 276 : if (parms)
3312 : {
3313 273 : tree parm_type = TREE_VALUE (parms);
3314 273 : const_p = CP_TYPE_CONST_P (non_reference (parm_type));
3315 : }
3316 276 : tree raises = NULL_TREE;
3317 276 : bool deleted_p = false;
3318 276 : tree scope = push_scope (ctype);
3319 552 : tree inh = DECL_INHERITED_CTOR (decl);
3320 :
3321 276 : synthesized_method_walk (ctype, sfk, const_p,
3322 : &raises, NULL, &deleted_p, NULL, false,
3323 : &inh, parms);
3324 276 : if (deleted_p)
3325 : {
3326 273 : inform (DECL_SOURCE_LOCATION (decl),
3327 : "%q#D is implicitly deleted because the default "
3328 : "definition would be ill-formed:", decl);
3329 273 : synthesized_method_walk (ctype, sfk, const_p,
3330 : NULL, NULL, &deleted_p, NULL, true,
3331 : &inh, parms);
3332 : }
3333 3 : else if (!comp_except_specs
3334 3 : (TYPE_RAISES_EXCEPTIONS (TREE_TYPE (decl)),
3335 : raises, ce_normal))
3336 3 : inform (DECL_SOURCE_LOCATION (decl), "%q#F is implicitly "
3337 : "deleted because its exception-specification does not "
3338 : "match the implicit exception-specification %qX",
3339 : decl, raises);
3340 0 : else if (flag_checking)
3341 0 : gcc_unreachable ();
3342 :
3343 276 : pop_scope (scope);
3344 : }
3345 :
3346 465 : input_location = loc;
3347 465 : return true;
3348 : }
3349 : return false;
3350 : }
3351 :
3352 : /* DECL is a defaulted function which was declared constexpr. Explain why
3353 : it can't be constexpr. */
3354 :
3355 : void
3356 26 : explain_implicit_non_constexpr (tree decl)
3357 : {
3358 26 : tree parms = FUNCTION_FIRST_USER_PARMTYPE (decl);
3359 26 : bool const_p = CP_TYPE_CONST_P (non_reference (TREE_VALUE (parms)));
3360 52 : tree inh = DECL_INHERITED_CTOR (decl);
3361 26 : bool dummy;
3362 26 : special_function_kind sfk = special_function_p (decl);
3363 26 : if (sfk == sfk_comparison)
3364 : {
3365 9 : DECL_DECLARED_CONSTEXPR_P (decl) = true;
3366 9 : build_comparison_op (decl, false, tf_warning_or_error);
3367 9 : DECL_DECLARED_CONSTEXPR_P (decl) = false;
3368 : }
3369 : else
3370 17 : synthesized_method_walk (DECL_CLASS_CONTEXT (decl),
3371 : sfk, const_p,
3372 : NULL, NULL, NULL, &dummy, true,
3373 : &inh, parms);
3374 26 : }
3375 :
3376 : /* DECL is an instantiation of an inheriting constructor template. Deduce
3377 : the correct exception-specification and deletedness for this particular
3378 : specialization. Return true if the deduction succeeds; false otherwise. */
3379 :
3380 : bool
3381 66389 : deduce_inheriting_ctor (tree decl)
3382 : {
3383 66389 : decl = DECL_ORIGIN (decl);
3384 132778 : gcc_assert (DECL_INHERITED_CTOR (decl));
3385 66389 : tree spec;
3386 66389 : bool trivial, constexpr_, deleted;
3387 66389 : tree inh = DECL_INHERITED_CTOR (decl);
3388 66389 : synthesized_method_walk (DECL_CONTEXT (decl), sfk_inheriting_constructor,
3389 : false, &spec, &trivial, &deleted, &constexpr_,
3390 : /*diag*/false,
3391 : &inh,
3392 66389 : FUNCTION_FIRST_USER_PARMTYPE (decl));
3393 66389 : if (spec == error_mark_node)
3394 : return false;
3395 66387 : if (TREE_CODE (inherited_ctor_binfo (decl)) != TREE_BINFO)
3396 : /* Inherited the same constructor from different base subobjects. */
3397 3 : deleted = true;
3398 66387 : DECL_DELETED_FN (decl) = deleted;
3399 66387 : TREE_TYPE (decl) = build_exception_variant (TREE_TYPE (decl), spec);
3400 66387 : SET_DECL_INHERITED_CTOR (decl, inh);
3401 :
3402 66387 : tree clone;
3403 199161 : FOR_EACH_CLONE (clone, decl)
3404 : {
3405 132774 : DECL_DELETED_FN (clone) = deleted;
3406 132774 : TREE_TYPE (clone) = build_exception_variant (TREE_TYPE (clone), spec);
3407 132774 : SET_DECL_INHERITED_CTOR (clone, inh);
3408 : }
3409 :
3410 : return true;
3411 : }
3412 :
3413 : /* Returns whether SFK is currently lazy within TYPE, i.e., it hasn't
3414 : yet been declared. */
3415 :
3416 : static bool
3417 31114959 : is_lazy_special_member (special_function_kind sfk, tree type)
3418 : {
3419 31114959 : switch (sfk)
3420 : {
3421 5487916 : case sfk_constructor:
3422 5487916 : return CLASSTYPE_LAZY_DEFAULT_CTOR (type);
3423 7157574 : case sfk_copy_constructor:
3424 7157574 : return CLASSTYPE_LAZY_COPY_CTOR (type);
3425 5781334 : case sfk_move_constructor:
3426 5781334 : return CLASSTYPE_LAZY_MOVE_CTOR (type);
3427 2861115 : case sfk_copy_assignment:
3428 2861115 : return CLASSTYPE_LAZY_COPY_ASSIGN (type);
3429 1445478 : case sfk_move_assignment:
3430 1445478 : return CLASSTYPE_LAZY_MOVE_ASSIGN (type);
3431 7942609 : case sfk_destructor:
3432 7942609 : return CLASSTYPE_LAZY_DESTRUCTOR (type);
3433 : default:
3434 : return false;
3435 : }
3436 : }
3437 :
3438 : /* Implicitly declare the special function indicated by KIND, as a
3439 : member of TYPE. For copy constructors and assignment operators,
3440 : CONST_P indicates whether these functions should take a const
3441 : reference argument or a non-const reference.
3442 : Returns the FUNCTION_DECL for the new implicitly declared function,
3443 : or NULL_TREE if we just discovered the function already exists.
3444 : Currently this can only happen for lazy implicit members. */
3445 :
3446 : tree
3447 31026301 : implicitly_declare_fn (special_function_kind kind, tree type,
3448 : bool const_p, tree pattern_fn,
3449 : tree inherited_parms)
3450 : {
3451 31026301 : tree fn;
3452 31026301 : tree parameter_types = void_list_node;
3453 31026301 : tree return_type;
3454 31026301 : tree fn_type;
3455 31026301 : tree raises = empty_except_spec;
3456 31026301 : tree rhs_parm_type = NULL_TREE;
3457 31026301 : tree this_parm;
3458 31026301 : tree name;
3459 31026301 : HOST_WIDE_INT saved_processing_template_decl;
3460 31026301 : bool deleted_p = false;
3461 31026301 : bool constexpr_p = false;
3462 62052602 : tree inherited_ctor = (kind == sfk_inheriting_constructor
3463 31026301 : ? pattern_fn : NULL_TREE);
3464 :
3465 : /* Because we create declarations for implicitly declared functions
3466 : lazily, we may be creating the declaration for a member of TYPE
3467 : while in some completely different context. However, TYPE will
3468 : never be a dependent class (because we never want to do lookups
3469 : for implicitly defined functions in a dependent class). */
3470 31026301 : gcc_assert (!dependent_type_p (type));
3471 :
3472 : /* If the member-specification does not explicitly declare any member or
3473 : friend named operator==, an == operator function is declared
3474 : implicitly for each three-way comparison operator function defined as
3475 : defaulted in the member-specification, with the same access and
3476 : function-definition and in the same class scope as the respective
3477 : three-way comparison operator function, except that the return type is
3478 : replaced with bool and the declarator-id is replaced with
3479 : operator==.
3480 :
3481 : [Note: Such an implicitly-declared == operator for a class X is
3482 : defined as defaulted in the definition of X and has the same
3483 : parameter-declaration-clause and trailing requires-clause as the
3484 : respective three-way comparison operator. It is declared with friend,
3485 : virtual, constexpr, or consteval if the three-way comparison operator
3486 : function is so declared. If the three-way comparison operator function
3487 : has no noexcept-specifier, the implicitly-declared == operator
3488 : function has an implicit exception specification (14.5) that may
3489 : differ from the implicit exception specification of the three-way
3490 : comparison operator function. --end note] */
3491 31026301 : if (kind == sfk_comparison)
3492 : {
3493 676 : fn = copy_operator_fn (pattern_fn, EQ_EXPR);
3494 676 : DECL_ARTIFICIAL (fn) = 1;
3495 676 : apply_deduced_return_type (fn, boolean_type_node);
3496 676 : return fn;
3497 : }
3498 :
3499 : /* Furthermore, we must set PROCESSING_TEMPLATE_DECL to zero here
3500 : because we only create clones for constructors and destructors
3501 : when not in a template. */
3502 31025625 : saved_processing_template_decl = processing_template_decl;
3503 31025625 : processing_template_decl = 0;
3504 :
3505 31025625 : type = TYPE_MAIN_VARIANT (type);
3506 :
3507 31025625 : if (targetm.cxx.cdtor_returns_this ())
3508 : {
3509 0 : if (kind == sfk_destructor)
3510 : /* See comment in check_special_function_return_type. */
3511 0 : return_type = build_pointer_type (void_type_node);
3512 : else
3513 0 : return_type = build_pointer_type (type);
3514 : }
3515 : else
3516 31025625 : return_type = void_type_node;
3517 :
3518 31025625 : int this_quals = TYPE_UNQUALIFIED;
3519 31025625 : switch (kind)
3520 : {
3521 7916638 : case sfk_destructor:
3522 : /* Destructor. */
3523 7916638 : name = dtor_identifier;
3524 7916638 : break;
3525 :
3526 5474052 : case sfk_constructor:
3527 : /* Default constructor. */
3528 5474052 : name = ctor_identifier;
3529 5474052 : break;
3530 :
3531 17634935 : case sfk_copy_constructor:
3532 17634935 : case sfk_copy_assignment:
3533 17634935 : case sfk_move_constructor:
3534 17634935 : case sfk_move_assignment:
3535 17634935 : case sfk_inheriting_constructor:
3536 17634935 : {
3537 17634935 : if (kind == sfk_copy_assignment
3538 17634935 : || kind == sfk_move_assignment)
3539 : {
3540 4299367 : return_type = build_reference_type (type);
3541 4299367 : name = assign_op_identifier;
3542 : }
3543 : else
3544 13335568 : name = ctor_identifier;
3545 :
3546 17634935 : if (kind == sfk_inheriting_constructor)
3547 : parameter_types = inherited_parms;
3548 : else
3549 : {
3550 17196002 : if (const_p)
3551 9991204 : rhs_parm_type = cp_build_qualified_type (type, TYPE_QUAL_CONST);
3552 : else
3553 : rhs_parm_type = type;
3554 17196002 : bool move_p = (kind == sfk_move_assignment
3555 17196002 : || kind == sfk_move_constructor);
3556 17196002 : rhs_parm_type = cp_build_reference_type (rhs_parm_type, move_p);
3557 :
3558 17196002 : parameter_types = tree_cons (NULL_TREE, rhs_parm_type, parameter_types);
3559 : }
3560 : break;
3561 : }
3562 :
3563 0 : default:
3564 0 : gcc_unreachable ();
3565 : }
3566 :
3567 31025625 : bool trivial_p = false;
3568 31025625 : bool was_lazy = is_lazy_special_member (kind, type);
3569 :
3570 31025625 : if (inherited_ctor)
3571 : {
3572 : /* For an inheriting constructor, just copy these flags from the
3573 : inherited constructor until deduce_inheriting_ctor. */
3574 438933 : raises = TYPE_RAISES_EXCEPTIONS (TREE_TYPE (inherited_ctor));
3575 438933 : deleted_p = DECL_DELETED_FN (inherited_ctor);
3576 438933 : constexpr_p = DECL_DECLARED_CONSTEXPR_P (inherited_ctor);
3577 : }
3578 30586692 : else if (cxx_dialect >= cxx11)
3579 : {
3580 30564086 : raises = noexcept_deferred_spec;
3581 30564086 : synthesized_method_walk (type, kind, const_p, NULL, &trivial_p,
3582 : &deleted_p, &constexpr_p, false,
3583 : &inherited_ctor, inherited_parms);
3584 : }
3585 : else
3586 22606 : synthesized_method_walk (type, kind, const_p, &raises, &trivial_p,
3587 : &deleted_p, &constexpr_p, false,
3588 : &inherited_ctor, inherited_parms);
3589 :
3590 : /* The above walk may have indirectly loaded a lazy decl we're
3591 : about to build from a module, let's not build it again. */
3592 31025625 : if (modules_p ()
3593 108736 : && was_lazy
3594 31114959 : && !is_lazy_special_member (kind, type))
3595 : return NULL_TREE;
3596 :
3597 : /* Don't bother marking a deleted constructor as constexpr. */
3598 31025622 : if (deleted_p)
3599 1172095 : constexpr_p = false;
3600 : /* A trivial copy/move constructor is also a constexpr constructor,
3601 : unless the class has virtual bases (7.1.5p4). */
3602 29853527 : else if (trivial_p
3603 25066199 : && cxx_dialect >= cxx11
3604 25052130 : && (kind == sfk_copy_constructor
3605 25052130 : || kind == sfk_move_constructor)
3606 40576686 : && !CLASSTYPE_VBASECLASSES (type))
3607 10723159 : gcc_assert (constexpr_p);
3608 :
3609 31025622 : if (!trivial_p && type_has_trivial_fn (type, kind))
3610 250576 : type_set_nontrivial_flag (type, kind);
3611 :
3612 : /* Create the function. */
3613 31025622 : tree this_type = cp_build_qualified_type (type, this_quals);
3614 31025622 : fn_type = build_method_type_directly (this_type, return_type,
3615 : parameter_types);
3616 :
3617 31025622 : if (raises)
3618 : {
3619 30881509 : if (raises != error_mark_node)
3620 30881506 : fn_type = build_exception_variant (fn_type, raises);
3621 : else
3622 : {
3623 : /* Can happen, e.g., in C++98 mode for an ill-formed non-static data
3624 : member initializer (c++/89914). Also, in C++98, we might have
3625 : failed to deduce RAISES, so try again but complain this time. */
3626 3 : if (cxx_dialect < cxx11)
3627 3 : synthesized_method_walk (type, kind, const_p, &raises, nullptr,
3628 : nullptr, nullptr, /*diag=*/true,
3629 : &inherited_ctor, inherited_parms);
3630 : /* We should have seen an error at this point. */
3631 3 : gcc_assert (seen_error ());
3632 : }
3633 : }
3634 31025622 : fn = build_lang_decl (FUNCTION_DECL, name, fn_type);
3635 31025622 : if (kind != sfk_inheriting_constructor)
3636 30586689 : DECL_SOURCE_LOCATION (fn) = DECL_SOURCE_LOCATION (TYPE_NAME (type));
3637 :
3638 31025622 : if (IDENTIFIER_OVL_OP_P (name))
3639 : {
3640 4299367 : const ovl_op_info_t *op = IDENTIFIER_OVL_OP_INFO (name);
3641 4299367 : DECL_OVERLOADED_OPERATOR_CODE_RAW (fn) = op->ovl_op_code;
3642 4299367 : }
3643 26726255 : else if (IDENTIFIER_CTOR_P (name))
3644 18809620 : DECL_CXX_CONSTRUCTOR_P (fn) = true;
3645 7916635 : else if (IDENTIFIER_DTOR_P (name))
3646 7916635 : DECL_CXX_DESTRUCTOR_P (fn) = true;
3647 : else
3648 0 : gcc_unreachable ();
3649 :
3650 31025622 : SET_DECL_ALIGN (fn, MINIMUM_METHOD_BOUNDARY);
3651 :
3652 : /* Create the explicit arguments. */
3653 31025622 : if (rhs_parm_type)
3654 : {
3655 : /* Note that this parameter is *not* marked DECL_ARTIFICIAL; we
3656 : want its type to be included in the mangled function
3657 : name. */
3658 17196002 : tree decl = cp_build_parm_decl (fn, NULL_TREE, rhs_parm_type);
3659 17196002 : TREE_READONLY (decl) = 1;
3660 17196002 : retrofit_lang_decl (decl);
3661 17196002 : DECL_PARM_INDEX (decl) = DECL_PARM_LEVEL (decl) = 1;
3662 17196002 : DECL_ARGUMENTS (fn) = decl;
3663 : }
3664 13829620 : else if (kind == sfk_inheriting_constructor)
3665 : {
3666 438933 : tree *p = &DECL_ARGUMENTS (fn);
3667 438933 : int index = 1;
3668 880271 : for (tree parm = inherited_parms; parm && parm != void_list_node;
3669 441338 : parm = TREE_CHAIN (parm))
3670 : {
3671 441338 : *p = cp_build_parm_decl (fn, NULL_TREE, TREE_VALUE (parm));
3672 441338 : retrofit_lang_decl (*p);
3673 441338 : DECL_PARM_LEVEL (*p) = 1;
3674 441338 : DECL_PARM_INDEX (*p) = index++;
3675 441338 : p = &DECL_CHAIN (*p);
3676 : }
3677 438933 : SET_DECL_INHERITED_CTOR (fn, inherited_ctor);
3678 438933 : DECL_NONCONVERTING_P (fn) = DECL_NONCONVERTING_P (inherited_ctor);
3679 : /* A constructor so declared has the same access as the corresponding
3680 : constructor in X. */
3681 438933 : TREE_PRIVATE (fn) = TREE_PRIVATE (inherited_ctor);
3682 438933 : TREE_PROTECTED (fn) = TREE_PROTECTED (inherited_ctor);
3683 : /* Copy constexpr from the inherited constructor even if the
3684 : inheriting constructor doesn't satisfy the requirements. */
3685 438933 : constexpr_p = DECL_DECLARED_CONSTEXPR_P (inherited_ctor);
3686 438933 : tree inherited_ctor_fn = STRIP_TEMPLATE (inherited_ctor);
3687 : /* Also copy any attributes. */
3688 438933 : DECL_ATTRIBUTES (fn) = clone_attrs (DECL_ATTRIBUTES (inherited_ctor_fn));
3689 : /* But remove gnu::gnu_inline attribute. See PR123526. */
3690 438933 : DECL_ATTRIBUTES (fn)
3691 438933 : = remove_attribute ("gnu", "gnu_inline", DECL_ATTRIBUTES (fn));
3692 438933 : DECL_DISREGARD_INLINE_LIMITS (fn)
3693 438933 : = DECL_DISREGARD_INLINE_LIMITS (inherited_ctor_fn);
3694 : }
3695 :
3696 : /* Add the "this" parameter. */
3697 31025622 : this_parm = build_this_parm (fn, fn_type, this_quals);
3698 31025622 : DECL_CHAIN (this_parm) = DECL_ARGUMENTS (fn);
3699 31025622 : DECL_ARGUMENTS (fn) = this_parm;
3700 :
3701 54134609 : grokclassfn (type, fn, kind == sfk_destructor ? DTOR_FLAG : NO_SPECIAL);
3702 :
3703 31025622 : DECL_IN_AGGR_P (fn) = 1;
3704 31025622 : DECL_ARTIFICIAL (fn) = 1;
3705 31025622 : DECL_DEFAULTED_FN (fn) = 1;
3706 31025622 : if (cxx_dialect >= cxx11)
3707 : {
3708 31003012 : DECL_DELETED_FN (fn) = deleted_p;
3709 31003012 : DECL_DECLARED_CONSTEXPR_P (fn) = constexpr_p;
3710 : }
3711 31025622 : DECL_EXTERNAL (fn) = true;
3712 31025622 : DECL_NOT_REALLY_EXTERN (fn) = 1;
3713 31025622 : DECL_DECLARED_INLINE_P (fn) = 1;
3714 31025622 : set_linkage_according_to_type (type, fn);
3715 31025622 : if (TREE_PUBLIC (fn))
3716 30974571 : DECL_COMDAT (fn) = 1;
3717 31025622 : rest_of_decl_compilation (fn, namespace_bindings_p (), at_eof);
3718 31025622 : gcc_assert (!TREE_USED (fn));
3719 :
3720 : /* Propagate constraints from the inherited constructor. */
3721 31025622 : if (flag_concepts && inherited_ctor)
3722 437021 : if (tree orig_ci = get_constraints (inherited_ctor))
3723 : {
3724 4195 : tree new_ci = copy_node (orig_ci);
3725 4195 : set_constraints (fn, new_ci);
3726 : }
3727 :
3728 : /* Restore PROCESSING_TEMPLATE_DECL. */
3729 31025622 : processing_template_decl = saved_processing_template_decl;
3730 :
3731 31025622 : if (inherited_ctor && TREE_CODE (inherited_ctor) == TEMPLATE_DECL)
3732 65254 : fn = add_inherited_template_parms (fn, inherited_ctor);
3733 :
3734 : /* Warn about calling a non-trivial move assignment in a virtual base. */
3735 1442270 : if (kind == sfk_move_assignment && !deleted_p && !trivial_p
3736 31371750 : && CLASSTYPE_VBASECLASSES (type))
3737 : {
3738 82 : location_t loc = input_location;
3739 82 : input_location = DECL_SOURCE_LOCATION (fn);
3740 82 : synthesized_method_walk (type, kind, const_p,
3741 : NULL, NULL, NULL, NULL, true,
3742 : NULL, NULL_TREE);
3743 82 : input_location = loc;
3744 : }
3745 :
3746 : return fn;
3747 : }
3748 :
3749 : /* Maybe mark an explicitly defaulted function FN as =deleted and warn,
3750 : or emit an error, as per [dcl.fct.def.default].
3751 : IMPLICIT_FN is the corresponding special member function that
3752 : would have been implicitly declared. We've already compared FN and
3753 : IMPLICIT_FN and they are not the same. */
3754 :
3755 : static void
3756 125 : maybe_delete_defaulted_fn (tree fn, tree implicit_fn)
3757 : {
3758 125 : if (DECL_ARTIFICIAL (fn))
3759 32 : return;
3760 :
3761 125 : auto_diagnostic_group d;
3762 125 : const special_function_kind kind = special_function_p (fn);
3763 125 : tree parmtype
3764 125 : = TREE_VALUE (DECL_XOBJ_MEMBER_FUNCTION_P (fn)
3765 : ? TREE_CHAIN (TYPE_ARG_TYPES (TREE_TYPE (fn)))
3766 : : FUNCTION_FIRST_USER_PARMTYPE (fn));
3767 125 : if (/* [dcl.fct.def.default] "if F1 is an assignment operator"... */
3768 125 : (SFK_ASSIGN_P (kind)
3769 : /* "and the return type of F1 differs from the return type of F2" */
3770 59 : && (!same_type_p (TREE_TYPE (TREE_TYPE (fn)),
3771 : TREE_TYPE (TREE_TYPE (implicit_fn)))
3772 : /* "or F1's non-object parameter type is not a reference,
3773 : the program is ill-formed" */
3774 45 : || !TYPE_REF_P (parmtype)))
3775 : /* If F1 is *not* explicitly defaulted on its first declaration, the
3776 : program is ill-formed. */
3777 162 : || !DECL_DEFAULTED_IN_CLASS_P (fn))
3778 : {
3779 25 : error ("defaulted declaration %q+D does not match the expected "
3780 : "signature", fn);
3781 25 : inform (DECL_SOURCE_LOCATION (fn), "expected signature: %qD",
3782 : implicit_fn);
3783 25 : return;
3784 : }
3785 :
3786 100 : DECL_DELETED_FN (fn) = true;
3787 :
3788 58 : const enum diagnostics::kind diag_kind = (cxx_dialect >= cxx20
3789 100 : ? diagnostics::kind::warning
3790 : : diagnostics::kind::pedwarn);
3791 :
3792 : /* Don't warn for template instantiations. */
3793 100 : if (DECL_TEMPLATE_INSTANTIATION (fn)
3794 100 : && diag_kind == diagnostics::kind::warning)
3795 : return;
3796 :
3797 93 : const char *wmsg;
3798 93 : switch (kind)
3799 : {
3800 : case sfk_copy_constructor:
3801 : wmsg = G_("explicitly defaulted copy constructor is implicitly deleted "
3802 : "because its declared type does not match the type of an "
3803 : "implicit copy constructor");
3804 : break;
3805 26 : case sfk_move_constructor:
3806 26 : wmsg = G_("explicitly defaulted move constructor is implicitly deleted "
3807 : "because its declared type does not match the type of an "
3808 : "implicit move constructor");
3809 26 : break;
3810 13 : case sfk_copy_assignment:
3811 13 : wmsg = G_("explicitly defaulted copy assignment operator is implicitly "
3812 : "deleted because its declared type does not match the type "
3813 : "of an implicit copy assignment operator");
3814 13 : break;
3815 21 : case sfk_move_assignment:
3816 21 : wmsg = G_("explicitly defaulted move assignment operator is implicitly "
3817 : "deleted because its declared type does not match the type "
3818 : "of an implicit move assignment operator");
3819 21 : break;
3820 0 : default:
3821 0 : gcc_unreachable ();
3822 : }
3823 93 : if (emit_diagnostic (diag_kind, DECL_SOURCE_LOCATION (fn),
3824 93 : OPT_Wdefaulted_function_deleted, wmsg))
3825 69 : inform (DECL_SOURCE_LOCATION (fn),
3826 : "expected signature: %qD", implicit_fn);
3827 125 : }
3828 :
3829 : /* Gives any errors about defaulted functions which need to be deferred
3830 : until the containing class is complete. IMP_CONST is false or true
3831 : if we are called from check_bases_and_members and signals whether
3832 : the implicit function has a non-object parameter of type const C&. */
3833 :
3834 : void
3835 6314545 : defaulted_late_check (tree fn, tristate imp_const/*=tristate::unknown()*/)
3836 : {
3837 : /* Complain about invalid signature for defaulted fn. */
3838 6314545 : tree ctx = DECL_CONTEXT (fn);
3839 6314545 : special_function_kind kind = special_function_p (fn);
3840 :
3841 6314545 : if (kind == sfk_comparison)
3842 : {
3843 : /* If the function was declared constexpr, check that the definition
3844 : qualifies. Otherwise we can define the function lazily. */
3845 37286 : if (DECL_DECLARED_CONSTEXPR_P (fn) && !DECL_INITIAL (fn))
3846 : {
3847 : /* Prevent GC. */
3848 27466 : function_depth++;
3849 27466 : synthesize_method (fn);
3850 27466 : function_depth--;
3851 : }
3852 48171 : return;
3853 : }
3854 :
3855 6277259 : bool fn_const_p = (copy_fn_p (fn) == 2);
3856 : /* "if F2 has a non-object parameter of type const C&, the corresponding
3857 : non-object parameter of F1 may be of type C&." But not the other way
3858 : around. */
3859 6277259 : if (fn_const_p && imp_const.is_false ())
3860 : fn_const_p = false;
3861 6277259 : tree implicit_fn = implicitly_declare_fn (kind, ctx, fn_const_p,
3862 : /*pattern_fn=*/NULL_TREE,
3863 : /*inherited_parms=*/NULL_TREE);
3864 6277259 : tree eh_spec = TYPE_RAISES_EXCEPTIONS (TREE_TYPE (implicit_fn));
3865 :
3866 : /* Includes special handling for a default xobj operator. */
3867 12554504 : auto compare_fn_params = [](tree fn, tree implicit_fn){
3868 6277245 : tree fn_parms = TYPE_ARG_TYPES (TREE_TYPE (fn));
3869 6277245 : tree implicit_fn_parms = TYPE_ARG_TYPES (TREE_TYPE (implicit_fn));
3870 :
3871 6277245 : if (DECL_XOBJ_MEMBER_FUNCTION_P (fn))
3872 : {
3873 6 : tree fn_obj_ref_type = TREE_VALUE (fn_parms);
3874 : /* We can't default xobj operators with an xobj parameter that is not
3875 : an lvalue reference, even if it would correspond. */
3876 6 : if (!TYPE_REF_P (fn_obj_ref_type)
3877 6 : || TYPE_REF_IS_RVALUE (fn_obj_ref_type)
3878 12 : || !object_parms_correspond (fn, implicit_fn,
3879 6 : DECL_CONTEXT (implicit_fn)))
3880 0 : return false;
3881 : /* We just compared the object parameters, skip over them before
3882 : passing to compparms. */
3883 6 : fn_parms = TREE_CHAIN (fn_parms);
3884 6 : implicit_fn_parms = TREE_CHAIN (implicit_fn_parms);
3885 : }
3886 6277245 : return compparms (fn_parms, implicit_fn_parms);
3887 : };
3888 :
3889 6277259 : if (!same_type_p (TREE_TYPE (TREE_TYPE (fn)),
3890 : TREE_TYPE (TREE_TYPE (implicit_fn)))
3891 6277259 : || !compare_fn_params (fn, implicit_fn))
3892 125 : maybe_delete_defaulted_fn (fn, implicit_fn);
3893 :
3894 6277259 : if (DECL_DELETED_FN (implicit_fn))
3895 : {
3896 10885 : DECL_DELETED_FN (fn) = 1;
3897 10885 : return;
3898 : }
3899 :
3900 : /* If a function is explicitly defaulted on its first declaration without an
3901 : exception-specification, it is implicitly considered to have the same
3902 : exception-specification as if it had been implicitly declared. */
3903 6266374 : if (!TYPE_RAISES_EXCEPTIONS (TREE_TYPE (fn))
3904 6266374 : && DECL_DEFAULTED_IN_CLASS_P (fn))
3905 4218561 : TREE_TYPE (fn) = build_exception_variant (TREE_TYPE (fn), eh_spec);
3906 :
3907 12532212 : if (DECL_DEFAULTED_IN_CLASS_P (fn)
3908 12532212 : && DECL_DECLARED_CONSTEXPR_P (implicit_fn))
3909 : {
3910 : /* Hmm...should we do this for out-of-class too? Should it be OK to
3911 : add constexpr later like inline, rather than requiring
3912 : declarations to match? */
3913 4664584 : DECL_DECLARED_CONSTEXPR_P (fn) = true;
3914 4664584 : if (kind == sfk_constructor)
3915 1557768 : TYPE_HAS_CONSTEXPR_CTOR (ctx) = true;
3916 : }
3917 :
3918 6266374 : if (!DECL_DECLARED_CONSTEXPR_P (implicit_fn)
3919 6266374 : && DECL_DECLARED_CONSTEXPR_P (fn))
3920 : {
3921 3232 : if (!CLASSTYPE_TEMPLATE_INSTANTIATION (ctx))
3922 : {
3923 16 : auto_diagnostic_group d;
3924 16 : error ("explicitly defaulted function %q+D cannot be declared "
3925 : "%qs because the implicit declaration is not %qs:", fn,
3926 32 : DECL_IMMEDIATE_FUNCTION_P (fn) ? "consteval" : "constexpr",
3927 : "constexpr");
3928 16 : explain_implicit_non_constexpr (fn);
3929 16 : }
3930 3232 : DECL_DECLARED_CONSTEXPR_P (fn) = false;
3931 : }
3932 : }
3933 :
3934 : /* Returns true iff FN can be explicitly defaulted, and gives any
3935 : errors if defaulting FN is ill-formed. */
3936 :
3937 : bool
3938 6743483 : defaultable_fn_check (tree fn)
3939 : {
3940 6743483 : special_function_kind kind = sfk_none;
3941 :
3942 6743483 : if (template_parm_scope_p ())
3943 : {
3944 3 : error ("a template cannot be defaulted");
3945 3 : return false;
3946 : }
3947 :
3948 13486960 : if (DECL_CONSTRUCTOR_P (fn))
3949 : {
3950 4196282 : if (FUNCTION_FIRST_USER_PARMTYPE (fn) == void_list_node)
3951 : kind = sfk_constructor;
3952 2064421 : else if (copy_fn_p (fn) > 0
3953 2064421 : && (TREE_CHAIN (FUNCTION_FIRST_USER_PARMTYPE (fn))
3954 1130679 : == void_list_node))
3955 : kind = sfk_copy_constructor;
3956 933745 : else if (move_fn_p (fn))
3957 : kind = sfk_move_constructor;
3958 : }
3959 2547198 : else if (DECL_DESTRUCTOR_P (fn))
3960 : kind = sfk_destructor;
3961 1841479 : else if (DECL_ASSIGNMENT_OPERATOR_P (fn)
3962 1841479 : && DECL_OVERLOADED_OPERATOR_IS (fn, NOP_EXPR))
3963 : {
3964 1626279 : if (copy_fn_p (fn))
3965 : kind = sfk_copy_assignment;
3966 643446 : else if (move_fn_p (fn))
3967 : kind = sfk_move_assignment;
3968 : }
3969 215200 : else if (DECL_OVERLOADED_OPERATOR_CODE_RAW (fn) >= OVL_OP_EQ_EXPR
3970 215200 : && DECL_OVERLOADED_OPERATOR_CODE_RAW (fn) <= OVL_OP_SPACESHIP_EXPR)
3971 : {
3972 215185 : kind = sfk_comparison;
3973 215185 : if (!early_check_defaulted_comparison (fn))
3974 : return false;
3975 : }
3976 :
3977 : /* FIXME: We need to check for xobj member functions here to give better
3978 : diagnostics for weird cases where unrelated xobj parameters are given.
3979 : We just want to do better than 'cannot be defaulted'. */
3980 :
3981 : if (kind == sfk_none)
3982 : {
3983 21 : error ("%qD cannot be defaulted", fn);
3984 21 : return false;
3985 : }
3986 : else
3987 : {
3988 6743380 : for (tree t = FUNCTION_FIRST_USER_PARMTYPE (fn);
3989 10840400 : t && t != void_list_node; t = TREE_CHAIN (t))
3990 4097023 : if (TREE_PURPOSE (t))
3991 : {
3992 3 : error ("defaulted function %q+D with default argument", fn);
3993 3 : break;
3994 : }
3995 :
3996 : /* Avoid do_warn_unused_parameter warnings. */
3997 10840403 : for (tree p = FUNCTION_FIRST_USER_PARM (fn); p; p = DECL_CHAIN (p))
3998 4097023 : if (DECL_NAME (p))
3999 233382 : suppress_warning (p, OPT_Wunused_parameter);
4000 :
4001 6743380 : if (current_class_type && TYPE_BEING_DEFINED (current_class_type))
4002 : /* Defer checking. */;
4003 22504 : else if (!processing_template_decl)
4004 548 : defaulted_late_check (fn);
4005 :
4006 6743380 : return true;
4007 : }
4008 : }
4009 :
4010 : /* Add an implicit declaration to TYPE for the kind of function
4011 : indicated by SFK. */
4012 :
4013 : void
4014 24309433 : lazily_declare_fn (special_function_kind sfk, tree type)
4015 : {
4016 24309433 : type = TYPE_MAIN_VARIANT (type);
4017 :
4018 : /* Whether or not the argument has a const reference type. */
4019 24309433 : bool const_p = ((sfk == sfk_copy_constructor
4020 5919711 : && TYPE_HAS_CONST_COPY_CTOR (type))
4021 24309658 : || (sfk == sfk_copy_assignment
4022 1590898 : && TYPE_HAS_CONST_COPY_ASSIGN (type)));
4023 :
4024 : /* Declare the function. */
4025 24309433 : tree fn = implicitly_declare_fn (sfk, type, const_p, NULL, NULL);
4026 :
4027 : /* We may have indirectly acquired the function from a module,
4028 : if so there's nothing else to do. */
4029 24309433 : if (!fn)
4030 : return;
4031 :
4032 24309430 : switch (sfk)
4033 : {
4034 3760947 : case sfk_constructor:
4035 3760947 : CLASSTYPE_LAZY_DEFAULT_CTOR (type) = 0;
4036 3760947 : break;
4037 5919711 : case sfk_copy_constructor:
4038 5919711 : CLASSTYPE_LAZY_COPY_CTOR (type) = 0;
4039 5919711 : break;
4040 4854582 : case sfk_move_constructor:
4041 4854582 : CLASSTYPE_LAZY_MOVE_CTOR (type) = 0;
4042 4854582 : break;
4043 1590898 : case sfk_copy_assignment:
4044 1590898 : CLASSTYPE_LAZY_COPY_ASSIGN (type) = 0;
4045 1590898 : break;
4046 1069014 : case sfk_move_assignment:
4047 1069014 : CLASSTYPE_LAZY_MOVE_ASSIGN (type) = 0;
4048 1069014 : break;
4049 7114278 : case sfk_destructor:
4050 7114278 : CLASSTYPE_LAZY_DESTRUCTOR (type) = 0;
4051 7114278 : break;
4052 0 : default:
4053 0 : gcc_unreachable ();
4054 : }
4055 :
4056 : /* [class.copy]/8 If the class definition declares a move constructor or
4057 : move assignment operator, the implicitly declared copy constructor is
4058 : defined as deleted.... */
4059 24309430 : if ((sfk == sfk_copy_assignment || sfk == sfk_copy_constructor)
4060 7510609 : && cxx_dialect >= cxx11)
4061 : {
4062 7496889 : if (classtype_has_move_assign_or_move_ctor_p (type, true))
4063 903029 : DECL_DELETED_FN (fn) = true;
4064 6593860 : else if (classtype_has_depr_implicit_copy (type))
4065 : /* The implicit definition of a copy constructor as defaulted is
4066 : deprecated if the class has a user-declared copy assignment operator
4067 : or a user-declared destructor. The implicit definition of a copy
4068 : assignment operator as defaulted is deprecated if the class has a
4069 : user-declared copy constructor or a user-declared destructor (15.4,
4070 : 15.8). */
4071 647524 : TREE_DEPRECATED (fn) = true;
4072 : }
4073 :
4074 : /* Destructors and assignment operators may be virtual. */
4075 24309430 : if (sfk == sfk_destructor
4076 24309430 : || sfk == sfk_move_assignment
4077 16126138 : || sfk == sfk_copy_assignment)
4078 9774190 : check_for_override (fn, type);
4079 :
4080 : /* Add it to the class */
4081 24309430 : bool added = add_method (type, fn, false);
4082 24309430 : gcc_assert (added || errorcount);
4083 :
4084 : /* Add it to TYPE_FIELDS. */
4085 24309430 : if (sfk == sfk_destructor
4086 24309430 : && DECL_VIRTUAL_P (fn))
4087 : /* The ABI requires that a virtual destructor go at the end of the
4088 : vtable. */
4089 183981 : TYPE_FIELDS (type) = chainon (TYPE_FIELDS (type), fn);
4090 : else
4091 : {
4092 24125449 : DECL_CHAIN (fn) = TYPE_FIELDS (type);
4093 24125449 : TYPE_FIELDS (type) = fn;
4094 : }
4095 : /* Propagate TYPE_FIELDS. */
4096 24309430 : fixup_type_variants (type);
4097 :
4098 24309430 : maybe_add_class_template_decl_list (type, fn, /*friend_p=*/0);
4099 24309430 : if (DECL_MAYBE_IN_CHARGE_CDTOR_P (fn))
4100 : /* Create appropriate clones. */
4101 21649518 : clone_cdtor (fn, /*update_methods=*/true);
4102 :
4103 : /* Classes, structs or unions TYPE marked with hotness attributes propagate
4104 : the attribute to all methods. This is typically done in
4105 : check_bases_and_members, but we must also inject them here for deferred
4106 : lazily-declared functions. */
4107 24309430 : maybe_propagate_warmth_attributes (fn, type);
4108 : }
4109 :
4110 : /* Given a FUNCTION_DECL FN and a chain LIST, skip as many elements of LIST
4111 : as there are artificial parms in FN. */
4112 :
4113 : tree
4114 3474382161 : skip_artificial_parms_for (const_tree fn, tree list)
4115 : {
4116 3474382161 : if (DECL_IOBJ_MEMBER_FUNCTION_P (fn))
4117 1809345557 : list = TREE_CHAIN (list);
4118 : else
4119 : return list;
4120 :
4121 1809345557 : if (DECL_HAS_IN_CHARGE_PARM_P (fn))
4122 11189146 : list = TREE_CHAIN (list);
4123 1809345557 : if (DECL_HAS_VTT_PARM_P (fn))
4124 14165636 : list = TREE_CHAIN (list);
4125 : return list;
4126 : }
4127 :
4128 : /* Given a FUNCTION_DECL FN and a chain LIST, return the number of
4129 : artificial parms in FN. */
4130 :
4131 : int
4132 402589731 : num_artificial_parms_for (const_tree fn)
4133 : {
4134 402589731 : int count = 0;
4135 :
4136 402589731 : if (DECL_IOBJ_MEMBER_FUNCTION_P (fn))
4137 371868771 : count++;
4138 : else
4139 : return 0;
4140 :
4141 371868771 : if (DECL_HAS_IN_CHARGE_PARM_P (fn))
4142 1661 : count++;
4143 371868771 : if (DECL_HAS_VTT_PARM_P (fn))
4144 105191 : count++;
4145 : return count;
4146 : }
4147 :
4148 : /* Return value of the __builtin_type_order trait. */
4149 :
4150 : tree
4151 3332 : type_order_value (tree type1, tree type2)
4152 : {
4153 3332 : tree rettype = lookup_comparison_category (cc_strong_ordering);
4154 3332 : if (rettype == error_mark_node)
4155 : return rettype;
4156 3330 : int ret;
4157 3330 : if (type1 == type2)
4158 : ret = 0;
4159 : else
4160 : {
4161 184 : const char *name1 = ASTRDUP (mangle_type_string (type1));
4162 184 : const char *name2 = mangle_type_string (type2);
4163 184 : ret = strcmp (name1, name2);
4164 : }
4165 3514 : return lookup_comparison_result (cc_strong_ordering, rettype,
4166 3514 : ret == 0 ? 0 : ret > 0 ? 1 : 2);
4167 : }
4168 :
4169 :
4170 : #include "gt-cp-method.h"
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