1 /* Handle the hair of processing (but not expanding) inline functions.
2 Also manage function and variable name overloading.
3 Copyright (C) 1987, 1989, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
4 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2007, 2008, 2009, 2010, 2011
5 Free Software Foundation, Inc.
6 Contributed by Michael Tiemann (tiemann@cygnus.com)
8 This file is part of GCC.
10 GCC is free software; you can redistribute it and/or modify
11 it under the terms of the GNU General Public License as published by
12 the Free Software Foundation; either version 3, or (at your option)
15 GCC is distributed in the hope that it will be useful,
16 but WITHOUT ANY WARRANTY; without even the implied warranty of
17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 GNU General Public License for more details.
20 You should have received a copy of the GNU General Public License
21 along with GCC; see the file COPYING3. If not see
22 <http://www.gnu.org/licenses/>. */
25 /* Handle method declarations. */
28 #include "coretypes.h"
37 #include "common/common-target.h"
38 #include "tree-pass.h"
39 #include "diagnostic.h"
43 /* Various flags to control the mangling process. */
49 /* The thing we are presently mangling is part of a template type,
50 rather than a fully instantiated type. Therefore, we may see
51 complex expressions where we would normally expect to see a
52 simple integer constant. */
53 mf_maybe_uninstantiated = 1,
54 /* When mangling a numeric value, use the form `_XX_' (instead of
55 just `XX') if the value has more than one digit. */
56 mf_use_underscores_around_value = 2
59 typedef enum mangling_flags mangling_flags;
61 static void do_build_copy_assign (tree);
62 static void do_build_copy_constructor (tree);
63 static tree make_alias_for_thunk (tree);
65 /* Called once to initialize method.c. */
73 /* Return a this or result adjusting thunk to FUNCTION. THIS_ADJUSTING
74 indicates whether it is a this or result adjusting thunk.
75 FIXED_OFFSET and VIRTUAL_OFFSET indicate how to do the adjustment
76 (see thunk_adjust). VIRTUAL_OFFSET can be NULL, but FIXED_OFFSET
77 never is. VIRTUAL_OFFSET is the /index/ into the vtable for this
78 adjusting thunks, we scale it to a byte offset. For covariant
79 thunks VIRTUAL_OFFSET is the virtual binfo. You must post process
80 the returned thunk with finish_thunk. */
83 make_thunk (tree function, bool this_adjusting,
84 tree fixed_offset, tree virtual_offset)
89 gcc_assert (TREE_CODE (function) == FUNCTION_DECL);
90 /* We can have this thunks to covariant thunks, but not vice versa. */
91 gcc_assert (!DECL_THIS_THUNK_P (function));
92 gcc_assert (!DECL_RESULT_THUNK_P (function) || this_adjusting);
94 /* Scale the VIRTUAL_OFFSET to be in terms of bytes. */
95 if (this_adjusting && virtual_offset)
97 = size_binop (MULT_EXPR,
100 TYPE_SIZE_UNIT (vtable_entry_type)));
102 d = tree_low_cst (fixed_offset, 0);
104 /* See if we already have the thunk in question. For this_adjusting
105 thunks VIRTUAL_OFFSET will be an INTEGER_CST, for covariant thunks it
107 for (thunk = DECL_THUNKS (function); thunk; thunk = DECL_CHAIN (thunk))
108 if (DECL_THIS_THUNK_P (thunk) == this_adjusting
109 && THUNK_FIXED_OFFSET (thunk) == d
110 && !virtual_offset == !THUNK_VIRTUAL_OFFSET (thunk)
113 ? tree_int_cst_equal (THUNK_VIRTUAL_OFFSET (thunk),
115 : THUNK_VIRTUAL_OFFSET (thunk) == virtual_offset)))
118 /* All thunks must be created before FUNCTION is actually emitted;
119 the ABI requires that all thunks be emitted together with the
120 function to which they transfer control. */
121 gcc_assert (!TREE_ASM_WRITTEN (function));
122 /* Likewise, we can only be adding thunks to a function declared in
123 the class currently being laid out. */
124 gcc_assert (TYPE_SIZE (DECL_CONTEXT (function))
125 && TYPE_BEING_DEFINED (DECL_CONTEXT (function)));
127 thunk = build_decl (DECL_SOURCE_LOCATION (function),
128 FUNCTION_DECL, NULL_TREE, TREE_TYPE (function));
129 DECL_LANG_SPECIFIC (thunk) = DECL_LANG_SPECIFIC (function);
130 cxx_dup_lang_specific_decl (thunk);
131 DECL_THUNKS (thunk) = NULL_TREE;
133 DECL_CONTEXT (thunk) = DECL_CONTEXT (function);
134 TREE_READONLY (thunk) = TREE_READONLY (function);
135 TREE_THIS_VOLATILE (thunk) = TREE_THIS_VOLATILE (function);
136 TREE_PUBLIC (thunk) = TREE_PUBLIC (function);
137 SET_DECL_THUNK_P (thunk, this_adjusting);
138 THUNK_TARGET (thunk) = function;
139 THUNK_FIXED_OFFSET (thunk) = d;
140 THUNK_VIRTUAL_OFFSET (thunk) = virtual_offset;
141 THUNK_ALIAS (thunk) = NULL_TREE;
143 DECL_INTERFACE_KNOWN (thunk) = 1;
144 DECL_NOT_REALLY_EXTERN (thunk) = 1;
145 DECL_COMDAT (thunk) = DECL_COMDAT (function);
146 DECL_SAVED_FUNCTION_DATA (thunk) = NULL;
147 /* The thunk itself is not a constructor or destructor, even if
148 the thing it is thunking to is. */
149 DECL_DESTRUCTOR_P (thunk) = 0;
150 DECL_CONSTRUCTOR_P (thunk) = 0;
151 DECL_EXTERNAL (thunk) = 1;
152 DECL_ARTIFICIAL (thunk) = 1;
153 /* The THUNK is not a pending inline, even if the FUNCTION is. */
154 DECL_PENDING_INLINE_P (thunk) = 0;
155 DECL_DECLARED_INLINE_P (thunk) = 0;
156 /* Nor is it a template instantiation. */
157 DECL_USE_TEMPLATE (thunk) = 0;
158 DECL_TEMPLATE_INFO (thunk) = NULL;
160 /* Add it to the list of thunks associated with FUNCTION. */
161 DECL_CHAIN (thunk) = DECL_THUNKS (function);
162 DECL_THUNKS (function) = thunk;
167 /* Finish THUNK, a thunk decl. */
170 finish_thunk (tree thunk)
173 tree fixed_offset = ssize_int (THUNK_FIXED_OFFSET (thunk));
174 tree virtual_offset = THUNK_VIRTUAL_OFFSET (thunk);
176 gcc_assert (!DECL_NAME (thunk) && DECL_THUNK_P (thunk));
177 if (virtual_offset && DECL_RESULT_THUNK_P (thunk))
178 virtual_offset = BINFO_VPTR_FIELD (virtual_offset);
179 function = THUNK_TARGET (thunk);
180 name = mangle_thunk (function, DECL_THIS_THUNK_P (thunk),
181 fixed_offset, virtual_offset);
183 /* We can end up with declarations of (logically) different
184 covariant thunks, that do identical adjustments. The two thunks
185 will be adjusting between within different hierarchies, which
186 happen to have the same layout. We must nullify one of them to
187 refer to the other. */
188 if (DECL_RESULT_THUNK_P (thunk))
192 for (cov_probe = DECL_THUNKS (function);
193 cov_probe; cov_probe = DECL_CHAIN (cov_probe))
194 if (DECL_NAME (cov_probe) == name)
196 gcc_assert (!DECL_THUNKS (thunk));
197 THUNK_ALIAS (thunk) = (THUNK_ALIAS (cov_probe)
198 ? THUNK_ALIAS (cov_probe) : cov_probe);
203 DECL_NAME (thunk) = name;
204 SET_DECL_ASSEMBLER_NAME (thunk, name);
207 static GTY (()) int thunk_labelno;
209 /* Create a static alias to target. */
212 make_alias_for (tree target, tree newid)
214 tree alias = build_decl (DECL_SOURCE_LOCATION (target),
215 TREE_CODE (target), newid, TREE_TYPE (target));
216 DECL_LANG_SPECIFIC (alias) = DECL_LANG_SPECIFIC (target);
217 cxx_dup_lang_specific_decl (alias);
218 DECL_CONTEXT (alias) = NULL;
219 TREE_READONLY (alias) = TREE_READONLY (target);
220 TREE_THIS_VOLATILE (alias) = TREE_THIS_VOLATILE (target);
221 TREE_PUBLIC (alias) = 0;
222 DECL_INTERFACE_KNOWN (alias) = 1;
223 if (DECL_LANG_SPECIFIC (alias))
225 DECL_NOT_REALLY_EXTERN (alias) = 1;
226 DECL_USE_TEMPLATE (alias) = 0;
227 DECL_TEMPLATE_INFO (alias) = NULL;
229 DECL_EXTERNAL (alias) = 0;
230 DECL_ARTIFICIAL (alias) = 1;
231 DECL_TEMPLATE_INSTANTIATED (alias) = 0;
232 if (TREE_CODE (alias) == FUNCTION_DECL)
234 DECL_SAVED_FUNCTION_DATA (alias) = NULL;
235 DECL_DESTRUCTOR_P (alias) = 0;
236 DECL_CONSTRUCTOR_P (alias) = 0;
237 DECL_PENDING_INLINE_P (alias) = 0;
238 DECL_DECLARED_INLINE_P (alias) = 0;
239 DECL_INITIAL (alias) = error_mark_node;
240 DECL_ARGUMENTS (alias) = copy_list (DECL_ARGUMENTS (target));
243 TREE_STATIC (alias) = 1;
244 TREE_ADDRESSABLE (alias) = 1;
245 TREE_USED (alias) = 1;
246 SET_DECL_ASSEMBLER_NAME (alias, DECL_NAME (alias));
247 TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (alias)) = 1;
252 make_alias_for_thunk (tree function)
257 targetm.asm_out.generate_internal_label (buf, "LTHUNK", thunk_labelno);
260 alias = make_alias_for (function, get_identifier (buf));
262 if (!flag_syntax_only)
264 struct cgraph_node *funcn, *aliasn;
265 funcn = cgraph_get_node (function);
266 gcc_checking_assert (funcn);
267 aliasn = cgraph_same_body_alias (funcn, alias, function);
268 DECL_ASSEMBLER_NAME (function);
269 gcc_assert (aliasn != NULL);
275 /* Emit the definition of a C++ multiple inheritance or covariant
276 return vtable thunk. If EMIT_P is nonzero, the thunk is emitted
280 use_thunk (tree thunk_fndecl, bool emit_p)
282 tree a, t, function, alias;
284 HOST_WIDE_INT fixed_offset, virtual_value;
285 bool this_adjusting = DECL_THIS_THUNK_P (thunk_fndecl);
286 struct cgraph_node *funcn, *thunk_node;
288 /* We should have called finish_thunk to give it a name. */
289 gcc_assert (DECL_NAME (thunk_fndecl));
291 /* We should never be using an alias, always refer to the
293 gcc_assert (!THUNK_ALIAS (thunk_fndecl));
295 if (TREE_ASM_WRITTEN (thunk_fndecl))
298 function = THUNK_TARGET (thunk_fndecl);
299 if (DECL_RESULT (thunk_fndecl))
300 /* We already turned this thunk into an ordinary function.
301 There's no need to process this thunk again. */
304 if (DECL_THUNK_P (function))
305 /* The target is itself a thunk, process it now. */
306 use_thunk (function, emit_p);
308 /* Thunks are always addressable; they only appear in vtables. */
309 TREE_ADDRESSABLE (thunk_fndecl) = 1;
311 /* Figure out what function is being thunked to. It's referenced in
312 this translation unit. */
313 TREE_ADDRESSABLE (function) = 1;
314 mark_used (function);
318 if (TARGET_USE_LOCAL_THUNK_ALIAS_P (function))
319 alias = make_alias_for_thunk (function);
323 fixed_offset = THUNK_FIXED_OFFSET (thunk_fndecl);
324 virtual_offset = THUNK_VIRTUAL_OFFSET (thunk_fndecl);
329 virtual_offset = BINFO_VPTR_FIELD (virtual_offset);
330 virtual_value = tree_low_cst (virtual_offset, /*pos=*/0);
331 gcc_assert (virtual_value);
336 /* And, if we need to emit the thunk, it's used. */
337 mark_used (thunk_fndecl);
338 /* This thunk is actually defined. */
339 DECL_EXTERNAL (thunk_fndecl) = 0;
340 /* The linkage of the function may have changed. FIXME in linkage
342 gcc_assert (DECL_INTERFACE_KNOWN (function));
343 TREE_PUBLIC (thunk_fndecl) = TREE_PUBLIC (function);
344 DECL_VISIBILITY (thunk_fndecl) = DECL_VISIBILITY (function);
345 DECL_VISIBILITY_SPECIFIED (thunk_fndecl)
346 = DECL_VISIBILITY_SPECIFIED (function);
347 DECL_COMDAT (thunk_fndecl) = DECL_COMDAT (function);
348 DECL_WEAK (thunk_fndecl) = DECL_WEAK (function);
350 if (flag_syntax_only)
352 TREE_ASM_WRITTEN (thunk_fndecl) = 1;
356 push_to_top_level ();
358 if (TARGET_USE_LOCAL_THUNK_ALIAS_P (function)
359 && targetm_common.have_named_sections)
361 resolve_unique_section (function, 0, flag_function_sections);
363 if (DECL_SECTION_NAME (function) != NULL && DECL_ONE_ONLY (function))
365 resolve_unique_section (thunk_fndecl, 0, flag_function_sections);
367 /* Output the thunk into the same section as function. */
368 DECL_SECTION_NAME (thunk_fndecl) = DECL_SECTION_NAME (function);
372 /* Set up cloned argument trees for the thunk. */
374 for (a = DECL_ARGUMENTS (function); a; a = DECL_CHAIN (a))
376 tree x = copy_node (a);
378 DECL_CONTEXT (x) = thunk_fndecl;
379 SET_DECL_RTL (x, NULL);
380 DECL_HAS_VALUE_EXPR_P (x) = 0;
381 TREE_ADDRESSABLE (x) = 0;
385 DECL_ARGUMENTS (thunk_fndecl) = a;
386 TREE_ASM_WRITTEN (thunk_fndecl) = 1;
387 funcn = cgraph_get_node (function);
388 gcc_checking_assert (funcn);
389 thunk_node = cgraph_add_thunk (funcn, thunk_fndecl, function,
390 this_adjusting, fixed_offset, virtual_value,
391 virtual_offset, alias);
392 if (DECL_ONE_ONLY (function))
393 cgraph_add_to_same_comdat_group (thunk_node, funcn);
396 || !targetm.asm_out.can_output_mi_thunk (thunk_fndecl, fixed_offset,
397 virtual_value, alias))
399 /* If this is a covariant thunk, or we don't have the necessary
400 code for efficient thunks, generate a thunk function that
401 just makes a call to the real function. Unfortunately, this
402 doesn't work for varargs. */
404 if (varargs_function_p (function))
405 error ("generic thunk code fails for method %q#D which uses %<...%>",
409 pop_from_top_level ();
412 /* Code for synthesizing methods which have default semantics defined. */
414 /* True iff CTYPE has a trivial SFK. */
417 type_has_trivial_fn (tree ctype, special_function_kind sfk)
421 case sfk_constructor:
422 return !TYPE_HAS_COMPLEX_DFLT (ctype);
423 case sfk_copy_constructor:
424 return !TYPE_HAS_COMPLEX_COPY_CTOR (ctype);
425 case sfk_move_constructor:
426 return !TYPE_HAS_COMPLEX_MOVE_CTOR (ctype);
427 case sfk_copy_assignment:
428 return !TYPE_HAS_COMPLEX_COPY_ASSIGN (ctype);
429 case sfk_move_assignment:
430 return !TYPE_HAS_COMPLEX_MOVE_ASSIGN (ctype);
432 return !TYPE_HAS_NONTRIVIAL_DESTRUCTOR (ctype);
438 /* Note that CTYPE has a non-trivial SFK even though we previously thought
442 type_set_nontrivial_flag (tree ctype, special_function_kind sfk)
446 case sfk_constructor:
447 TYPE_HAS_COMPLEX_DFLT (ctype) = true;
449 case sfk_copy_constructor:
450 TYPE_HAS_COMPLEX_COPY_CTOR (ctype) = true;
452 case sfk_move_constructor:
453 TYPE_HAS_COMPLEX_MOVE_CTOR (ctype) = true;
455 case sfk_copy_assignment:
456 TYPE_HAS_COMPLEX_COPY_ASSIGN (ctype) = true;
458 case sfk_move_assignment:
459 TYPE_HAS_COMPLEX_MOVE_ASSIGN (ctype) = true;
462 TYPE_HAS_NONTRIVIAL_DESTRUCTOR (ctype) = true;
469 /* True iff FN is a trivial defaulted member function ([cd]tor, op=). */
472 trivial_fn_p (tree fn)
474 if (!DECL_DEFAULTED_FN (fn))
477 /* If fn is a clone, get the primary variant. */
478 fn = DECL_ORIGIN (fn);
479 return type_has_trivial_fn (DECL_CONTEXT (fn), special_function_p (fn));
482 /* Generate code for default X(X&) or X(X&&) constructor. */
485 do_build_copy_constructor (tree fndecl)
487 tree parm = FUNCTION_FIRST_USER_PARM (fndecl);
488 bool move_p = DECL_MOVE_CONSTRUCTOR_P (fndecl);
489 bool trivial = trivial_fn_p (fndecl);
491 parm = convert_from_reference (parm);
494 && is_empty_class (current_class_type))
495 /* Don't copy the padding byte; it might not have been allocated
496 if *this is a base subobject. */;
499 tree t = build2 (INIT_EXPR, void_type_node, current_class_ref, parm);
500 finish_expr_stmt (t);
504 tree fields = TYPE_FIELDS (current_class_type);
505 tree member_init_list = NULL_TREE;
506 int cvquals = cp_type_quals (TREE_TYPE (parm));
508 tree binfo, base_binfo;
510 VEC(tree,gc) *vbases;
512 /* Initialize all the base-classes with the parameter converted
513 to their type so that we get their copy constructor and not
514 another constructor that takes current_class_type. We must
515 deal with the binfo's directly as a direct base might be
516 inaccessible due to ambiguity. */
517 for (vbases = CLASSTYPE_VBASECLASSES (current_class_type), i = 0;
518 VEC_iterate (tree, vbases, i, binfo); i++)
520 init = build_base_path (PLUS_EXPR, parm, binfo, 1,
521 tf_warning_or_error);
526 build_tree_list (NULL_TREE, init),
530 for (binfo = TYPE_BINFO (current_class_type), i = 0;
531 BINFO_BASE_ITERATE (binfo, i, base_binfo); i++)
533 if (BINFO_VIRTUAL_P (base_binfo))
536 init = build_base_path (PLUS_EXPR, parm, base_binfo, 1,
537 tf_warning_or_error);
541 = tree_cons (base_binfo,
542 build_tree_list (NULL_TREE, init),
546 for (; fields; fields = DECL_CHAIN (fields))
551 if (TREE_CODE (field) != FIELD_DECL)
554 expr_type = TREE_TYPE (field);
555 if (DECL_NAME (field))
557 if (VFIELD_NAME_P (DECL_NAME (field)))
560 else if (ANON_AGGR_TYPE_P (expr_type) && TYPE_FIELDS (expr_type))
561 /* Just use the field; anonymous types can't have
562 nontrivial copy ctors or assignment ops or this
563 function would be deleted. */;
567 /* Compute the type of "init->field". If the copy-constructor
568 parameter is, for example, "const S&", and the type of
569 the field is "T", then the type will usually be "const
570 T". (There are no cv-qualified variants of reference
572 if (TREE_CODE (expr_type) != REFERENCE_TYPE)
576 if (DECL_MUTABLE_P (field))
577 quals &= ~TYPE_QUAL_CONST;
578 quals |= cp_type_quals (expr_type);
579 expr_type = cp_build_qualified_type (expr_type, quals);
582 init = build3 (COMPONENT_REF, expr_type, parm, field, NULL_TREE);
583 if (move_p && TREE_CODE (expr_type) != REFERENCE_TYPE)
585 init = build_tree_list (NULL_TREE, init);
587 member_init_list = tree_cons (field, init, member_init_list);
589 finish_mem_initializers (member_init_list);
594 do_build_copy_assign (tree fndecl)
596 tree parm = DECL_CHAIN (DECL_ARGUMENTS (fndecl));
598 bool move_p = move_fn_p (fndecl);
599 bool trivial = trivial_fn_p (fndecl);
600 int flags = LOOKUP_NORMAL | LOOKUP_NONVIRTUAL | LOOKUP_DEFAULTED;
602 compound_stmt = begin_compound_stmt (0);
603 parm = convert_from_reference (parm);
606 && is_empty_class (current_class_type))
607 /* Don't copy the padding byte; it might not have been allocated
608 if *this is a base subobject. */;
611 tree t = build2 (MODIFY_EXPR, void_type_node, current_class_ref, parm);
612 finish_expr_stmt (t);
617 int cvquals = cp_type_quals (TREE_TYPE (parm));
619 tree binfo, base_binfo;
621 /* Assign to each of the direct base classes. */
622 for (binfo = TYPE_BINFO (current_class_type), i = 0;
623 BINFO_BASE_ITERATE (binfo, i, base_binfo); i++)
626 VEC(tree,gc) *parmvec;
628 /* We must convert PARM directly to the base class
629 explicitly since the base class may be ambiguous. */
630 converted_parm = build_base_path (PLUS_EXPR, parm, base_binfo, 1,
631 tf_warning_or_error);
633 converted_parm = move (converted_parm);
634 /* Call the base class assignment operator. */
635 parmvec = make_tree_vector_single (converted_parm);
637 (build_special_member_call (current_class_ref,
638 ansi_assopname (NOP_EXPR),
642 tf_warning_or_error));
643 release_tree_vector (parmvec);
646 /* Assign to each of the non-static data members. */
647 for (fields = TYPE_FIELDS (current_class_type);
649 fields = DECL_CHAIN (fields))
651 tree comp = current_class_ref;
657 if (TREE_CODE (field) != FIELD_DECL || DECL_ARTIFICIAL (field))
660 expr_type = TREE_TYPE (field);
662 if (CP_TYPE_CONST_P (expr_type))
664 error ("non-static const member %q#D, can%'t use default "
665 "assignment operator", field);
668 else if (TREE_CODE (expr_type) == REFERENCE_TYPE)
670 error ("non-static reference member %q#D, can%'t use "
671 "default assignment operator", field);
675 if (DECL_NAME (field))
677 if (VFIELD_NAME_P (DECL_NAME (field)))
680 else if (ANON_AGGR_TYPE_P (expr_type)
681 && TYPE_FIELDS (expr_type) != NULL_TREE)
682 /* Just use the field; anonymous types can't have
683 nontrivial copy ctors or assignment ops or this
684 function would be deleted. */;
688 comp = build3 (COMPONENT_REF, expr_type, comp, field, NULL_TREE);
690 /* Compute the type of init->field */
692 if (DECL_MUTABLE_P (field))
693 quals &= ~TYPE_QUAL_CONST;
694 expr_type = cp_build_qualified_type (expr_type, quals);
696 init = build3 (COMPONENT_REF, expr_type, init, field, NULL_TREE);
697 if (move_p && TREE_CODE (expr_type) != REFERENCE_TYPE)
700 if (DECL_NAME (field))
701 init = cp_build_modify_expr (comp, NOP_EXPR, init,
702 tf_warning_or_error);
704 init = build2 (MODIFY_EXPR, TREE_TYPE (comp), comp, init);
705 finish_expr_stmt (init);
708 finish_return_stmt (current_class_ref);
709 finish_compound_stmt (compound_stmt);
712 /* Synthesize FNDECL, a non-static member function. */
715 synthesize_method (tree fndecl)
717 bool nested = (current_function_decl != NULL_TREE);
718 tree context = decl_function_context (fndecl);
719 bool need_body = true;
721 location_t save_input_location = input_location;
722 int error_count = errorcount;
723 int warning_count = warningcount;
725 /* Reset the source location, we might have been previously
726 deferred, and thus have saved where we were first needed. */
727 DECL_SOURCE_LOCATION (fndecl)
728 = DECL_SOURCE_LOCATION (TYPE_NAME (DECL_CONTEXT (fndecl)));
730 /* If we've been asked to synthesize a clone, just synthesize the
731 cloned function instead. Doing so will automatically fill in the
732 body for the clone. */
733 if (DECL_CLONED_FUNCTION_P (fndecl))
734 fndecl = DECL_CLONED_FUNCTION (fndecl);
736 /* We may be in the middle of deferred access check. Disable
738 push_deferring_access_checks (dk_no_deferred);
741 push_to_top_level ();
743 push_function_context ();
745 input_location = DECL_SOURCE_LOCATION (fndecl);
747 start_preparsed_function (fndecl, NULL_TREE, SF_DEFAULT | SF_PRE_PARSED);
748 stmt = begin_function_body ();
750 if (DECL_OVERLOADED_OPERATOR_P (fndecl) == NOP_EXPR)
752 do_build_copy_assign (fndecl);
755 else if (DECL_CONSTRUCTOR_P (fndecl))
757 tree arg_chain = FUNCTION_FIRST_USER_PARMTYPE (fndecl);
758 if (arg_chain != void_list_node)
759 do_build_copy_constructor (fndecl);
761 finish_mem_initializers (NULL_TREE);
764 /* If we haven't yet generated the body of the function, just
765 generate an empty compound statement. */
769 compound_stmt = begin_compound_stmt (BCS_FN_BODY);
770 finish_compound_stmt (compound_stmt);
773 finish_function_body (stmt);
774 expand_or_defer_fn (finish_function (0));
776 input_location = save_input_location;
779 pop_from_top_level ();
781 pop_function_context ();
783 pop_deferring_access_checks ();
785 if (error_count != errorcount || warning_count != warningcount)
786 inform (input_location, "synthesized method %qD first required here ",
790 /* Build a reference to type TYPE with cv-quals QUALS, which is an
791 rvalue if RVALUE is true. */
794 build_stub_type (tree type, int quals, bool rvalue)
796 tree argtype = cp_build_qualified_type (type, quals);
797 return cp_build_reference_type (argtype, rvalue);
800 /* Build a dummy glvalue from dereferencing a dummy reference of type
804 build_stub_object (tree reftype)
806 tree stub = build1 (NOP_EXPR, reftype, integer_one_node);
807 return convert_from_reference (stub);
810 /* Determine which function will be called when looking up NAME in TYPE,
811 called with a single ARGTYPE argument, or no argument if ARGTYPE is
812 null. FLAGS and COMPLAIN are as for build_new_method_call.
814 Returns a FUNCTION_DECL if all is well.
815 Returns NULL_TREE if overload resolution failed.
816 Returns error_mark_node if the chosen function cannot be called. */
819 locate_fn_flags (tree type, tree name, tree argtype, int flags,
820 tsubst_flags_t complain)
822 tree ob, fn, fns, binfo, rval;
826 binfo = TYPE_BINFO (type);
830 type = BINFO_TYPE (binfo);
833 ob = build_stub_object (cp_build_reference_type (type, false));
834 args = make_tree_vector ();
837 tree arg = build_stub_object (argtype);
838 VEC_quick_push (tree, args, arg);
841 fns = lookup_fnfields (binfo, name, 0);
842 rval = build_new_method_call (ob, fns, &args, binfo, flags, &fn, complain);
844 release_tree_vector (args);
845 if (fn && rval == error_mark_node)
851 /* Locate the dtor of TYPE. */
854 get_dtor (tree type, tsubst_flags_t complain)
856 tree fn = locate_fn_flags (type, complete_dtor_identifier, NULL_TREE,
857 LOOKUP_NORMAL, complain);
858 if (fn == error_mark_node)
863 /* Locate the default ctor of TYPE. */
866 locate_ctor (tree type)
870 push_deferring_access_checks (dk_no_check);
871 fn = locate_fn_flags (type, complete_ctor_identifier, NULL_TREE,
872 LOOKUP_SPECULATIVE, tf_none);
873 pop_deferring_access_checks ();
874 if (fn == error_mark_node)
879 /* Likewise, but give any appropriate errors. */
882 get_default_ctor (tree type)
884 tree fn = locate_fn_flags (type, complete_ctor_identifier, NULL_TREE,
885 LOOKUP_NORMAL, tf_warning_or_error);
886 if (fn == error_mark_node)
891 /* Locate the copy ctor of TYPE. */
894 get_copy_ctor (tree type, tsubst_flags_t complain)
896 int quals = (TYPE_HAS_CONST_COPY_CTOR (type)
897 ? TYPE_QUAL_CONST : TYPE_UNQUALIFIED);
898 tree argtype = build_stub_type (type, quals, false);
899 tree fn = locate_fn_flags (type, complete_ctor_identifier, argtype,
900 LOOKUP_NORMAL, complain);
901 if (fn == error_mark_node)
906 /* Locate the copy assignment operator of TYPE. */
909 get_copy_assign (tree type)
911 int quals = (TYPE_HAS_CONST_COPY_ASSIGN (type)
912 ? TYPE_QUAL_CONST : TYPE_UNQUALIFIED);
913 tree argtype = build_stub_type (type, quals, false);
914 tree fn = locate_fn_flags (type, ansi_assopname (NOP_EXPR), argtype,
915 LOOKUP_NORMAL, tf_warning_or_error);
916 if (fn == error_mark_node)
921 /* Subroutine of synthesized_method_walk. Update SPEC_P, TRIVIAL_P and
922 DELETED_P or give an error message MSG with argument ARG. */
925 process_subob_fn (tree fn, bool move_p, tree *spec_p, bool *trivial_p,
926 bool *deleted_p, bool *constexpr_p, bool *no_implicit_p,
927 const char *msg, tree arg)
929 if (!fn || fn == error_mark_node)
934 tree raises = TYPE_RAISES_EXCEPTIONS (TREE_TYPE (fn));
935 *spec_p = merge_exception_specifiers (*spec_p, raises, fn);
938 if (!trivial_fn_p (fn))
942 if (TREE_CODE (arg) == FIELD_DECL
943 && TREE_CODE (DECL_CONTEXT (arg)) == UNION_TYPE)
948 error ("union member %q+D with non-trivial %qD", arg, fn);
952 /* Core 1402: A non-trivial non-move ctor suppresses the implicit
953 declaration of the move ctor/op=. */
954 if (no_implicit_p && move_p && !move_signature_fn_p (fn)
955 && !trivial_fn_p (fn))
956 *no_implicit_p = true;
958 if (constexpr_p && !DECL_DECLARED_CONSTEXPR_P (fn))
960 *constexpr_p = false;
963 inform (0, "defaulted constructor calls non-constexpr "
965 explain_invalid_constexpr_fn (fn);
976 /* Subroutine of synthesized_method_walk to allow recursion into anonymous
980 walk_field_subobs (tree fields, tree fnname, special_function_kind sfk,
981 int quals, bool copy_arg_p, bool move_p,
982 bool assign_p, tree *spec_p, bool *trivial_p,
983 bool *deleted_p, bool *constexpr_p, bool *no_implicit_p,
984 const char *msg, int flags, tsubst_flags_t complain)
987 for (field = fields; field; field = DECL_CHAIN (field))
989 tree mem_type, argtype, rval;
991 if (TREE_CODE (field) != FIELD_DECL
992 || DECL_ARTIFICIAL (field))
995 mem_type = strip_array_types (TREE_TYPE (field));
999 if (CP_TYPE_CONST_P (mem_type) && !CLASS_TYPE_P (mem_type))
1002 error ("non-static const member %q#D, can%'t use default "
1003 "assignment operator", field);
1005 else if (TREE_CODE (mem_type) == REFERENCE_TYPE)
1008 error ("non-static reference member %q#D, can%'t use "
1009 "default assignment operator", field);
1014 if (bad && deleted_p)
1017 else if (sfk == sfk_constructor)
1021 if (DECL_INITIAL (field))
1023 if (msg && DECL_INITIAL (field) == error_mark_node)
1024 inform (0, "initializer for %q+#D is invalid", field);
1028 /* Core 1351: If the field has an NSDMI that could throw, the
1029 default constructor is noexcept(false). FIXME this is
1030 broken by deferred parsing and 1360 saying we can't lazily
1031 declare a non-trivial default constructor. Also this
1032 needs to do deferred instantiation. Disable until the
1033 conflict between 1351 and 1360 is resolved. */
1034 if (spec_p && !expr_noexcept_p (DECL_INITIAL (field), complain))
1035 *spec_p = noexcept_false_spec;
1038 /* Don't do the normal processing. */
1043 if (CP_TYPE_CONST_P (mem_type)
1044 && default_init_uninitialized_part (mem_type))
1047 error ("uninitialized non-static const member %q#D",
1051 else if (TREE_CODE (mem_type) == REFERENCE_TYPE)
1054 error ("uninitialized non-static reference member %q#D",
1059 if (bad && deleted_p)
1062 /* For an implicitly-defined default constructor to be constexpr,
1063 every member must have a user-provided default constructor or
1064 an explicit initializer. */
1065 if (constexpr_p && !CLASS_TYPE_P (mem_type)
1066 && TREE_CODE (DECL_CONTEXT (field)) != UNION_TYPE)
1068 *constexpr_p = false;
1070 inform (0, "defaulted default constructor does not "
1071 "initialize %q+#D", field);
1075 if (!CLASS_TYPE_P (mem_type))
1078 if (ANON_AGGR_TYPE_P (mem_type))
1080 walk_field_subobs (TYPE_FIELDS (mem_type), fnname, sfk, quals,
1081 copy_arg_p, move_p, assign_p, spec_p, trivial_p,
1082 deleted_p, constexpr_p, no_implicit_p,
1083 msg, flags, complain);
1089 int mem_quals = cp_type_quals (mem_type) | quals;
1090 if (DECL_MUTABLE_P (field))
1091 mem_quals &= ~TYPE_QUAL_CONST;
1092 argtype = build_stub_type (mem_type, mem_quals, move_p);
1095 argtype = NULL_TREE;
1097 rval = locate_fn_flags (mem_type, fnname, argtype, flags, complain);
1099 process_subob_fn (rval, move_p, spec_p, trivial_p, deleted_p,
1100 constexpr_p, no_implicit_p, msg, field);
1104 /* The caller wants to generate an implicit declaration of SFK for CTYPE
1105 which is const if relevant and CONST_P is set. If spec_p, trivial_p and
1106 deleted_p are non-null, set their referent appropriately. If diag is
1107 true, we're either being called from maybe_explain_implicit_delete to
1108 give errors, or if constexpr_p is non-null, from
1109 explain_invalid_constexpr_fn. */
1112 synthesized_method_walk (tree ctype, special_function_kind sfk, bool const_p,
1113 tree *spec_p, bool *trivial_p, bool *deleted_p,
1114 bool *constexpr_p, bool *no_implicit_p, bool diag)
1116 tree binfo, base_binfo, scope, fnname, rval, argtype;
1117 bool move_p, copy_arg_p, assign_p, expected_trivial, check_vdtor;
1118 VEC(tree,gc) *vbases;
1119 int i, quals, flags;
1120 tsubst_flags_t complain;
1125 *spec_p = (cxx_dialect >= cxx0x ? noexcept_true_spec : empty_except_spec);
1128 *no_implicit_p = false;
1132 /* "The closure type associated with a lambda-expression has a deleted
1133 default constructor and a deleted copy assignment operator."
1134 This is diagnosed in maybe_explain_implicit_delete. */
1135 if (LAMBDA_TYPE_P (ctype)
1136 && (sfk == sfk_constructor
1137 || sfk == sfk_copy_assignment))
1148 check_vdtor = false;
1151 case sfk_move_assignment:
1152 case sfk_copy_assignment:
1154 fnname = ansi_assopname (NOP_EXPR);
1157 case sfk_destructor:
1159 /* The synthesized method will call base dtors, but check complete
1160 here to avoid having to deal with VTT. */
1161 fnname = complete_dtor_identifier;
1164 case sfk_constructor:
1165 case sfk_move_constructor:
1166 case sfk_copy_constructor:
1168 fnname = complete_ctor_identifier;
1175 /* If that user-written default constructor would satisfy the
1176 requirements of a constexpr constructor (7.1.5), the
1177 implicitly-defined default constructor is constexpr. */
1179 *constexpr_p = ctor_p;
1184 case sfk_constructor:
1185 case sfk_destructor:
1189 case sfk_move_constructor:
1190 case sfk_move_assignment:
1192 case sfk_copy_constructor:
1193 case sfk_copy_assignment:
1201 expected_trivial = type_has_trivial_fn (ctype, sfk);
1203 *trivial_p = expected_trivial;
1205 /* The TYPE_HAS_COMPLEX_* flags tell us about constraints from base
1206 class versions and other properties of the type. But a subobject
1207 class can be trivially copyable and yet have overload resolution
1208 choose a template constructor for initialization, depending on
1209 rvalueness and cv-quals. So we can't exit early for copy/move
1210 methods in C++0x. The same considerations apply in C++98/03, but
1211 there the definition of triviality does not consider overload
1212 resolution, so a constructor can be trivial even if it would otherwise
1213 call a non-trivial constructor. */
1214 if (expected_trivial
1215 && (!copy_arg_p || cxx_dialect < cxx0x))
1217 if (constexpr_p && sfk == sfk_constructor)
1219 bool cx = trivial_default_constructor_is_constexpr (ctype);
1221 if (diag && !cx && TREE_CODE (ctype) == UNION_TYPE)
1222 /* A trivial constructor doesn't have any NSDMI. */
1223 inform (input_location, "defaulted default constructor does "
1224 "not initialize any non-static data member");
1230 ++cp_unevaluated_operand;
1231 ++c_inhibit_evaluation_warnings;
1233 scope = push_scope (ctype);
1237 flags = LOOKUP_NORMAL|LOOKUP_SPECULATIVE|LOOKUP_DEFAULTED;
1238 complain = tf_warning_or_error;
1242 flags = LOOKUP_PROTECT|LOOKUP_SPECULATIVE|LOOKUP_DEFAULTED;
1247 quals = TYPE_QUAL_CONST;
1249 quals = TYPE_UNQUALIFIED;
1250 argtype = NULL_TREE;
1255 msg = ("base %qT does not have a move assignment operator or trivial "
1256 "copy assignment operator");
1258 msg = ("base %qT does not have a move constructor or trivial "
1259 "copy constructor");
1261 for (binfo = TYPE_BINFO (ctype), i = 0;
1262 BINFO_BASE_ITERATE (binfo, i, base_binfo); ++i)
1264 tree basetype = BINFO_TYPE (base_binfo);
1266 argtype = build_stub_type (basetype, quals, move_p);
1267 rval = locate_fn_flags (base_binfo, fnname, argtype, flags, complain);
1269 process_subob_fn (rval, move_p, spec_p, trivial_p, deleted_p,
1270 constexpr_p, no_implicit_p, msg, basetype);
1271 if (ctor_p && TYPE_HAS_NONTRIVIAL_DESTRUCTOR (basetype))
1273 /* In a constructor we also need to check the subobject
1274 destructors for cleanup of partially constructed objects. */
1275 rval = locate_fn_flags (base_binfo, complete_dtor_identifier,
1276 NULL_TREE, flags, complain);
1277 /* Note that we don't pass down trivial_p; the subobject
1278 destructors don't affect triviality of the constructor. Nor
1279 do they affect constexpr-ness (a constant expression doesn't
1280 throw) or exception-specification (a throw from one of the
1281 dtors would be a double-fault). */
1282 process_subob_fn (rval, false, NULL, NULL,
1283 deleted_p, NULL, NULL, NULL,
1287 if (check_vdtor && type_has_virtual_destructor (basetype))
1289 rval = locate_fn_flags (ctype, ansi_opname (DELETE_EXPR),
1290 ptr_type_node, flags, complain);
1291 /* Unlike for base ctor/op=/dtor, for operator delete it's fine
1292 to have a null rval (no class-specific op delete). */
1293 if (rval && rval == error_mark_node && deleted_p)
1295 check_vdtor = false;
1299 vbases = CLASSTYPE_VBASECLASSES (ctype);
1300 if (vbases && assign_p && move_p)
1302 /* Should the spec be changed to allow vbases that only occur once? */
1304 error ("%qT has virtual bases, default move assignment operator "
1305 "cannot be generated", ctype);
1312 msg = ("virtual base %qT does not have a move constructor "
1313 "or trivial copy constructor");
1314 if (vbases && constexpr_p)
1315 *constexpr_p = false;
1316 FOR_EACH_VEC_ELT (tree, vbases, i, base_binfo)
1318 tree basetype = BINFO_TYPE (base_binfo);
1320 argtype = build_stub_type (basetype, quals, move_p);
1321 rval = locate_fn_flags (base_binfo, fnname, argtype, flags, complain);
1323 process_subob_fn (rval, move_p, spec_p, trivial_p, deleted_p,
1324 constexpr_p, no_implicit_p, msg, basetype);
1325 if (ctor_p && TYPE_HAS_NONTRIVIAL_DESTRUCTOR (basetype))
1327 rval = locate_fn_flags (base_binfo, complete_dtor_identifier,
1328 NULL_TREE, flags, complain);
1329 process_subob_fn (rval, false, NULL, NULL,
1330 deleted_p, NULL, NULL, NULL,
1336 /* Leave msg null. */;
1338 msg = ("non-static data member %qD does not have a move "
1339 "assignment operator or trivial copy assignment operator");
1341 msg = ("non-static data member %qD does not have a move "
1342 "constructor or trivial copy constructor");
1343 walk_field_subobs (TYPE_FIELDS (ctype), fnname, sfk, quals,
1344 copy_arg_p, move_p, assign_p, spec_p, trivial_p,
1345 deleted_p, constexpr_p, no_implicit_p,
1346 msg, flags, complain);
1348 walk_field_subobs (TYPE_FIELDS (ctype), complete_dtor_identifier,
1349 sfk_destructor, TYPE_UNQUALIFIED, false,
1350 false, false, NULL, NULL,
1352 NULL, NULL, flags, complain);
1356 --cp_unevaluated_operand;
1357 --c_inhibit_evaluation_warnings;
1360 /* DECL is a deleted function. If it's implicitly deleted, explain why and
1361 return true; else return false. */
1364 maybe_explain_implicit_delete (tree decl)
1366 /* If decl is a clone, get the primary variant. */
1367 decl = DECL_ORIGIN (decl);
1368 gcc_assert (DECL_DELETED_FN (decl));
1369 if (DECL_DEFAULTED_FN (decl))
1371 /* Not marked GTY; it doesn't need to be GC'd or written to PCH. */
1372 static struct pointer_set_t *explained;
1374 special_function_kind sfk;
1380 explained = pointer_set_create ();
1381 if (pointer_set_insert (explained, decl))
1384 sfk = special_function_p (decl);
1385 ctype = DECL_CONTEXT (decl);
1386 loc = input_location;
1387 input_location = DECL_SOURCE_LOCATION (decl);
1390 if (LAMBDA_TYPE_P (ctype))
1393 if (sfk == sfk_constructor)
1394 inform (DECL_SOURCE_LOCATION (decl),
1395 "a lambda closure type has a deleted default constructor");
1396 else if (sfk == sfk_copy_assignment)
1397 inform (DECL_SOURCE_LOCATION (decl),
1398 "a lambda closure type has a deleted copy assignment operator");
1402 else if (DECL_ARTIFICIAL (decl)
1403 && (sfk == sfk_copy_assignment
1404 || sfk == sfk_copy_constructor)
1405 && (type_has_user_declared_move_constructor (ctype)
1406 || type_has_user_declared_move_assign (ctype)))
1408 inform (0, "%q+#D is implicitly declared as deleted because %qT "
1409 "declares a move constructor or move assignment operator",
1415 tree parm_type = TREE_VALUE (FUNCTION_FIRST_USER_PARMTYPE (decl));
1416 bool const_p = CP_TYPE_CONST_P (non_reference (parm_type));
1417 tree scope = push_scope (ctype);
1418 inform (0, "%q+#D is implicitly deleted because the default "
1419 "definition would be ill-formed:", decl);
1421 synthesized_method_walk (ctype, sfk, const_p,
1422 NULL, NULL, NULL, NULL, NULL, true);
1425 input_location = loc;
1431 /* DECL is a defaulted function which was declared constexpr. Explain why
1432 it can't be constexpr. */
1435 explain_implicit_non_constexpr (tree decl)
1437 tree parm_type = TREE_VALUE (FUNCTION_FIRST_USER_PARMTYPE (decl));
1438 bool const_p = CP_TYPE_CONST_P (non_reference (parm_type));
1440 synthesized_method_walk (DECL_CLASS_CONTEXT (decl),
1441 special_function_p (decl), const_p,
1442 NULL, NULL, NULL, &dummy, NULL, true);
1445 /* Implicitly declare the special function indicated by KIND, as a
1446 member of TYPE. For copy constructors and assignment operators,
1447 CONST_P indicates whether these functions should take a const
1448 reference argument or a non-const reference. Returns the
1449 FUNCTION_DECL for the implicitly declared function. */
1452 implicitly_declare_fn (special_function_kind kind, tree type, bool const_p)
1455 tree parameter_types = void_list_node;
1458 tree raises = empty_except_spec;
1459 tree rhs_parm_type = NULL_TREE;
1462 HOST_WIDE_INT saved_processing_template_decl;
1468 /* Because we create declarations for implicitly declared functions
1469 lazily, we may be creating the declaration for a member of TYPE
1470 while in some completely different context. However, TYPE will
1471 never be a dependent class (because we never want to do lookups
1472 for implicitly defined functions in a dependent class).
1473 Furthermore, we must set PROCESSING_TEMPLATE_DECL to zero here
1474 because we only create clones for constructors and destructors
1475 when not in a template. */
1476 gcc_assert (!dependent_type_p (type));
1477 saved_processing_template_decl = processing_template_decl;
1478 processing_template_decl = 0;
1480 type = TYPE_MAIN_VARIANT (type);
1482 if (targetm.cxx.cdtor_returns_this () && !TYPE_FOR_JAVA (type))
1484 if (kind == sfk_destructor)
1485 /* See comment in check_special_function_return_type. */
1486 return_type = build_pointer_type (void_type_node);
1488 return_type = build_pointer_type (type);
1491 return_type = void_type_node;
1495 case sfk_destructor:
1497 name = constructor_name (type);
1500 case sfk_constructor:
1501 /* Default constructor. */
1502 name = constructor_name (type);
1505 case sfk_copy_constructor:
1506 case sfk_copy_assignment:
1507 case sfk_move_constructor:
1508 case sfk_move_assignment:
1511 if (kind == sfk_copy_assignment
1512 || kind == sfk_move_assignment)
1514 return_type = build_reference_type (type);
1515 name = ansi_assopname (NOP_EXPR);
1518 name = constructor_name (type);
1521 rhs_parm_type = cp_build_qualified_type (type, TYPE_QUAL_CONST);
1523 rhs_parm_type = type;
1524 move_p = (kind == sfk_move_assignment
1525 || kind == sfk_move_constructor);
1526 rhs_parm_type = cp_build_reference_type (rhs_parm_type, move_p);
1528 parameter_types = tree_cons (NULL_TREE, rhs_parm_type, parameter_types);
1535 synthesized_method_walk (type, kind, const_p, &raises, &trivial_p,
1536 &deleted_p, &constexpr_p, &no_implicit_p, false);
1537 /* Don't bother marking a deleted constructor as constexpr. */
1539 constexpr_p = false;
1540 /* A trivial copy/move constructor is also a constexpr constructor. */
1541 else if (trivial_p && cxx_dialect >= cxx0x
1542 && (kind == sfk_copy_constructor
1543 || kind == sfk_move_constructor))
1544 gcc_assert (constexpr_p);
1546 if (!trivial_p && type_has_trivial_fn (type, kind))
1547 type_set_nontrivial_flag (type, kind);
1549 /* Create the function. */
1550 fn_type = build_method_type_directly (type, return_type, parameter_types);
1552 fn_type = build_exception_variant (fn_type, raises);
1553 fn = build_lang_decl (FUNCTION_DECL, name, fn_type);
1554 DECL_SOURCE_LOCATION (fn) = DECL_SOURCE_LOCATION (TYPE_NAME (type));
1555 if (kind == sfk_constructor || kind == sfk_copy_constructor
1556 || kind == sfk_move_constructor)
1557 DECL_CONSTRUCTOR_P (fn) = 1;
1558 else if (kind == sfk_destructor)
1559 DECL_DESTRUCTOR_P (fn) = 1;
1562 DECL_ASSIGNMENT_OPERATOR_P (fn) = 1;
1563 SET_OVERLOADED_OPERATOR_CODE (fn, NOP_EXPR);
1566 /* If pointers to member functions use the least significant bit to
1567 indicate whether a function is virtual, ensure a pointer
1568 to this function will have that bit clear. */
1569 if (TARGET_PTRMEMFUNC_VBIT_LOCATION == ptrmemfunc_vbit_in_pfn
1570 && DECL_ALIGN (fn) < 2 * BITS_PER_UNIT)
1571 DECL_ALIGN (fn) = 2 * BITS_PER_UNIT;
1573 /* Create the explicit arguments. */
1576 /* Note that this parameter is *not* marked DECL_ARTIFICIAL; we
1577 want its type to be included in the mangled function
1579 tree decl = cp_build_parm_decl (NULL_TREE, rhs_parm_type);
1580 TREE_READONLY (decl) = 1;
1581 retrofit_lang_decl (decl);
1582 DECL_PARM_INDEX (decl) = DECL_PARM_LEVEL (decl) = 1;
1583 DECL_ARGUMENTS (fn) = decl;
1585 /* Add the "this" parameter. */
1586 this_parm = build_this_parm (fn_type, TYPE_UNQUALIFIED);
1587 DECL_CHAIN (this_parm) = DECL_ARGUMENTS (fn);
1588 DECL_ARGUMENTS (fn) = this_parm;
1590 grokclassfn (type, fn, kind == sfk_destructor ? DTOR_FLAG : NO_SPECIAL);
1591 set_linkage_according_to_type (type, fn);
1592 rest_of_decl_compilation (fn, toplevel_bindings_p (), at_eof);
1593 DECL_IN_AGGR_P (fn) = 1;
1594 DECL_ARTIFICIAL (fn) = 1;
1595 DECL_DEFAULTED_FN (fn) = 1;
1596 if (cxx_dialect >= cxx0x)
1598 DECL_DELETED_FN (fn) = deleted_p;
1599 DECL_DECLARED_CONSTEXPR_P (fn) = constexpr_p;
1601 FNDECL_SUPPRESS_IMPLICIT_DECL (fn) = no_implicit_p;
1602 DECL_EXTERNAL (fn) = true;
1603 DECL_NOT_REALLY_EXTERN (fn) = 1;
1604 DECL_DECLARED_INLINE_P (fn) = 1;
1605 gcc_assert (!TREE_USED (fn));
1607 /* Restore PROCESSING_TEMPLATE_DECL. */
1608 processing_template_decl = saved_processing_template_decl;
1613 /* Gives any errors about defaulted functions which need to be deferred
1614 until the containing class is complete. */
1617 defaulted_late_check (tree fn)
1619 /* Complain about invalid signature for defaulted fn. */
1620 tree ctx = DECL_CONTEXT (fn);
1621 special_function_kind kind = special_function_p (fn);
1622 bool fn_const_p = (copy_fn_p (fn) == 2);
1623 tree implicit_fn = implicitly_declare_fn (kind, ctx, fn_const_p);
1625 if (!same_type_p (TREE_TYPE (TREE_TYPE (fn)),
1626 TREE_TYPE (TREE_TYPE (implicit_fn)))
1627 || !compparms (TYPE_ARG_TYPES (TREE_TYPE (fn)),
1628 TYPE_ARG_TYPES (TREE_TYPE (implicit_fn))))
1630 error ("defaulted declaration %q+D", fn);
1631 error_at (DECL_SOURCE_LOCATION (fn),
1632 "does not match expected signature %qD", implicit_fn);
1635 /* 8.4.2/2: If it is explicitly defaulted on its first declaration, it is
1636 implicitly considered to have the same exception-specification as if
1637 it had been implicitly declared. */
1638 if (DECL_DEFAULTED_IN_CLASS_P (fn))
1640 tree eh_spec = TYPE_RAISES_EXCEPTIONS (TREE_TYPE (implicit_fn));
1641 if (TYPE_RAISES_EXCEPTIONS (TREE_TYPE (fn)))
1643 maybe_instantiate_noexcept (fn);
1644 if (!comp_except_specs (TYPE_RAISES_EXCEPTIONS (TREE_TYPE (fn)),
1645 eh_spec, ce_normal))
1646 error ("function %q+D defaulted on its first declaration "
1647 "with an exception-specification that differs from "
1648 "the implicit declaration %q#D", fn, implicit_fn);
1650 TREE_TYPE (fn) = build_exception_variant (TREE_TYPE (fn), eh_spec);
1651 if (DECL_DECLARED_CONSTEXPR_P (implicit_fn))
1653 /* Hmm...should we do this for out-of-class too? Should it be OK to
1654 add constexpr later like inline, rather than requiring
1655 declarations to match? */
1656 DECL_DECLARED_CONSTEXPR_P (fn) = true;
1657 if (kind == sfk_constructor)
1658 TYPE_HAS_CONSTEXPR_CTOR (ctx) = true;
1662 if (!DECL_DECLARED_CONSTEXPR_P (implicit_fn)
1663 && DECL_DECLARED_CONSTEXPR_P (fn))
1665 if (!CLASSTYPE_TEMPLATE_INSTANTIATION (ctx))
1667 error ("explicitly defaulted function %q+D cannot be declared "
1668 "as constexpr because the implicit declaration is not "
1670 explain_implicit_non_constexpr (fn);
1672 DECL_DECLARED_CONSTEXPR_P (fn) = false;
1675 if (DECL_DELETED_FN (implicit_fn))
1676 DECL_DELETED_FN (fn) = 1;
1679 /* Returns true iff FN can be explicitly defaulted, and gives any
1680 errors if defaulting FN is ill-formed. */
1683 defaultable_fn_check (tree fn)
1685 special_function_kind kind = sfk_none;
1687 if (template_parm_scope_p ())
1689 error ("a template cannot be defaulted");
1693 if (DECL_CONSTRUCTOR_P (fn))
1695 if (FUNCTION_FIRST_USER_PARMTYPE (fn) == void_list_node)
1696 kind = sfk_constructor;
1697 else if (copy_fn_p (fn) > 0
1698 && (TREE_CHAIN (FUNCTION_FIRST_USER_PARMTYPE (fn))
1700 kind = sfk_copy_constructor;
1701 else if (move_fn_p (fn))
1702 kind = sfk_move_constructor;
1704 else if (DECL_DESTRUCTOR_P (fn))
1705 kind = sfk_destructor;
1706 else if (DECL_ASSIGNMENT_OPERATOR_P (fn)
1707 && DECL_OVERLOADED_OPERATOR_P (fn) == NOP_EXPR)
1710 kind = sfk_copy_assignment;
1711 else if (move_fn_p (fn))
1712 kind = sfk_move_assignment;
1715 if (kind == sfk_none)
1717 error ("%qD cannot be defaulted", fn);
1722 tree t = FUNCTION_FIRST_USER_PARMTYPE (fn);
1723 for (; t && t != void_list_node; t = TREE_CHAIN (t))
1724 if (TREE_PURPOSE (t))
1726 error ("defaulted function %q+D with default argument", fn);
1729 if (TYPE_BEING_DEFINED (DECL_CONTEXT (fn)))
1730 /* Defer checking. */;
1731 else if (!processing_template_decl)
1732 defaulted_late_check (fn);
1738 /* Add an implicit declaration to TYPE for the kind of function
1739 indicated by SFK. Return the FUNCTION_DECL for the new implicit
1743 lazily_declare_fn (special_function_kind sfk, tree type)
1746 /* Whether or not the argument has a const reference type. */
1747 bool const_p = false;
1751 case sfk_constructor:
1752 CLASSTYPE_LAZY_DEFAULT_CTOR (type) = 0;
1754 case sfk_copy_constructor:
1755 const_p = TYPE_HAS_CONST_COPY_CTOR (type);
1756 CLASSTYPE_LAZY_COPY_CTOR (type) = 0;
1758 case sfk_move_constructor:
1759 CLASSTYPE_LAZY_MOVE_CTOR (type) = 0;
1761 case sfk_copy_assignment:
1762 const_p = TYPE_HAS_CONST_COPY_ASSIGN (type);
1763 CLASSTYPE_LAZY_COPY_ASSIGN (type) = 0;
1765 case sfk_move_assignment:
1766 CLASSTYPE_LAZY_MOVE_ASSIGN (type) = 0;
1768 case sfk_destructor:
1769 CLASSTYPE_LAZY_DESTRUCTOR (type) = 0;
1775 /* Declare the function. */
1776 fn = implicitly_declare_fn (sfk, type, const_p);
1778 /* [class.copy]/8 If the class definition declares a move constructor or
1779 move assignment operator, the implicitly declared copy constructor is
1780 defined as deleted.... */
1781 if ((sfk == sfk_copy_assignment
1782 || sfk == sfk_copy_constructor)
1783 && (type_has_user_declared_move_constructor (type)
1784 || type_has_user_declared_move_assign (type)))
1785 DECL_DELETED_FN (fn) = true;
1787 /* For move variants, rather than declare them as deleted we just
1788 don't declare them at all. */
1789 if (DECL_DELETED_FN (fn)
1790 && (sfk == sfk_move_constructor
1791 || sfk == sfk_move_assignment))
1794 /* We also suppress implicit move if it would call a non-trivial copy. */
1795 if (FNDECL_SUPPRESS_IMPLICIT_DECL (fn))
1798 /* A destructor may be virtual. */
1799 if (sfk == sfk_destructor
1800 || sfk == sfk_move_assignment
1801 || sfk == sfk_copy_assignment)
1802 check_for_override (fn, type);
1803 /* Add it to CLASSTYPE_METHOD_VEC. */
1804 add_method (type, fn, NULL_TREE);
1805 /* Add it to TYPE_METHODS. */
1806 if (sfk == sfk_destructor
1807 && DECL_VIRTUAL_P (fn)
1808 && abi_version_at_least (2))
1809 /* The ABI requires that a virtual destructor go at the end of the
1811 TYPE_METHODS (type) = chainon (TYPE_METHODS (type), fn);
1814 /* G++ 3.2 put the implicit destructor at the *beginning* of the
1815 TYPE_METHODS list, which cause the destructor to be emitted
1816 in an incorrect location in the vtable. */
1817 if (warn_abi && sfk == sfk_destructor && DECL_VIRTUAL_P (fn))
1818 warning (OPT_Wabi, "vtable layout for class %qT may not be ABI-compliant"
1819 "and may change in a future version of GCC due to "
1820 "implicit virtual destructor",
1822 DECL_CHAIN (fn) = TYPE_METHODS (type);
1823 TYPE_METHODS (type) = fn;
1825 maybe_add_class_template_decl_list (type, fn, /*friend_p=*/0);
1826 if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (fn)
1827 || DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P (fn))
1828 /* Create appropriate clones. */
1829 clone_function_decl (fn, /*update_method_vec=*/true);
1834 /* Given a FUNCTION_DECL FN and a chain LIST, skip as many elements of LIST
1835 as there are artificial parms in FN. */
1838 skip_artificial_parms_for (const_tree fn, tree list)
1840 if (DECL_NONSTATIC_MEMBER_FUNCTION_P (fn))
1841 list = TREE_CHAIN (list);
1845 if (DECL_HAS_IN_CHARGE_PARM_P (fn))
1846 list = TREE_CHAIN (list);
1847 if (DECL_HAS_VTT_PARM_P (fn))
1848 list = TREE_CHAIN (list);
1852 /* Given a FUNCTION_DECL FN and a chain LIST, return the number of
1853 artificial parms in FN. */
1856 num_artificial_parms_for (const_tree fn)
1860 if (DECL_NONSTATIC_MEMBER_FUNCTION_P (fn))
1865 if (DECL_HAS_IN_CHARGE_PARM_P (fn))
1867 if (DECL_HAS_VTT_PARM_P (fn))
1873 #include "gt-cp-method.h"