1 /* Process declarations and variables for C++ compiler.
2 Copyright (C) 1988-2018 Free Software Foundation, Inc.
3 Hacked by Michael Tiemann (tiemann@cygnus.com)
5 This file is part of GCC.
7 GCC is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3, or (at your option)
12 GCC is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with GCC; see the file COPYING3. If not see
19 <http://www.gnu.org/licenses/>. */
22 /* Process declarations and symbol lookup for C++ front end.
23 Also constructs types; the standard scalar types at initialization,
24 and structure, union, array and enum types when they are declared. */
26 /* ??? not all decl nodes are given the most useful possible
27 line numbers. For example, the CONST_DECLs for enum values. */
31 #include "coretypes.h"
35 #include "c-family/c-common.h"
37 #include "stringpool.h"
41 #include "stor-layout.h"
45 #include "c-family/c-objc.h"
46 #include "c-family/c-pragma.h"
49 #include "c-family/c-ada-spec.h"
52 /* Id for dumping the raw trees. */
55 extern cpp_reader *parse_in;
57 /* This structure contains information about the initializations
58 and/or destructions required for a particular priority level. */
59 typedef struct priority_info_s {
60 /* Nonzero if there have been any initializations at this priority
61 throughout the translation unit. */
62 int initializations_p;
63 /* Nonzero if there have been any destructions at this priority
64 throughout the translation unit. */
68 static void mark_vtable_entries (tree);
69 static bool maybe_emit_vtables (tree);
70 static tree start_objects (int, int);
71 static void finish_objects (int, int, tree);
72 static tree start_static_storage_duration_function (unsigned);
73 static void finish_static_storage_duration_function (tree);
74 static priority_info get_priority_info (int);
75 static void do_static_initialization_or_destruction (tree, bool);
76 static void one_static_initialization_or_destruction (tree, tree, bool);
77 static void generate_ctor_or_dtor_function (bool, int, location_t *);
78 static int generate_ctor_and_dtor_functions_for_priority (splay_tree_node,
80 static tree prune_vars_needing_no_initialization (tree *);
81 static void write_out_vars (tree);
82 static void import_export_class (tree);
83 static tree get_guard_bits (tree);
84 static void determine_visibility_from_class (tree, tree);
85 static bool determine_hidden_inline (tree);
86 static void maybe_instantiate_decl (tree);
88 /* A list of static class variables. This is needed, because a
89 static class variable can be declared inside the class without
90 an initializer, and then initialized, statically, outside the class. */
91 static GTY(()) vec<tree, va_gc> *pending_statics;
93 /* A list of functions which were declared inline, but which we
94 may need to emit outline anyway. */
95 static GTY(()) vec<tree, va_gc> *deferred_fns;
97 /* A list of decls that use types with no linkage, which we need to make
99 static GTY(()) vec<tree, va_gc> *no_linkage_decls;
101 /* A vector of alternating decls and identifiers, where the latter
102 is to be an alias for the former if the former is defined. */
103 static GTY(()) vec<tree, va_gc> *mangling_aliases;
105 /* hash traits for declarations. Hashes single decls via
106 DECL_ASSEMBLER_NAME_RAW. */
108 struct mangled_decl_hash : ggc_remove <tree>
110 typedef tree value_type; /* A DECL. */
111 typedef tree compare_type; /* An identifier. */
113 static hashval_t hash (const value_type decl)
115 return IDENTIFIER_HASH_VALUE (DECL_ASSEMBLER_NAME_RAW (decl));
117 static bool equal (const value_type existing, compare_type candidate)
119 tree name = DECL_ASSEMBLER_NAME_RAW (existing);
120 return candidate == name;
123 static inline void mark_empty (value_type &p) {p = NULL_TREE;}
124 static inline bool is_empty (value_type p) {return !p;}
126 static bool is_deleted (value_type e)
128 return e == reinterpret_cast <value_type> (1);
130 static void mark_deleted (value_type &e)
132 e = reinterpret_cast <value_type> (1);
136 /* A hash table of decls keyed by mangled name. Used to figure out if
137 we need compatibility aliases. */
138 static GTY(()) hash_table<mangled_decl_hash> *mangled_decls;
140 /* Nonzero if we're done parsing and into end-of-file activities. */
144 /* True if note_mangling_alias should enqueue mangling aliases for
145 later generation, rather than emitting them right away. */
147 bool defer_mangling_aliases = true;
150 /* Return a member function type (a METHOD_TYPE), given FNTYPE (a
151 FUNCTION_TYPE), CTYPE (class type), and QUALS (the cv-qualifiers
152 that apply to the function). */
155 build_memfn_type (tree fntype, tree ctype, cp_cv_quals quals,
156 cp_ref_qualifier rqual)
161 bool late_return_type_p;
163 if (fntype == error_mark_node || ctype == error_mark_node)
164 return error_mark_node;
166 gcc_assert (TREE_CODE (fntype) == FUNCTION_TYPE
167 || TREE_CODE (fntype) == METHOD_TYPE);
169 type_quals = quals & ~TYPE_QUAL_RESTRICT;
170 ctype = cp_build_qualified_type (ctype, type_quals);
171 raises = TYPE_RAISES_EXCEPTIONS (fntype);
172 attrs = TYPE_ATTRIBUTES (fntype);
173 late_return_type_p = TYPE_HAS_LATE_RETURN_TYPE (fntype);
174 fntype = build_method_type_directly (ctype, TREE_TYPE (fntype),
175 (TREE_CODE (fntype) == METHOD_TYPE
176 ? TREE_CHAIN (TYPE_ARG_TYPES (fntype))
177 : TYPE_ARG_TYPES (fntype)));
179 fntype = cp_build_type_attribute_variant (fntype, attrs);
181 fntype = build_ref_qualified_type (fntype, rqual);
183 fntype = build_exception_variant (fntype, raises);
184 if (late_return_type_p)
185 TYPE_HAS_LATE_RETURN_TYPE (fntype) = 1;
190 /* Return a variant of FNTYPE, a FUNCTION_TYPE or METHOD_TYPE, with its
191 return type changed to NEW_RET. */
194 change_return_type (tree new_ret, tree fntype)
197 tree args = TYPE_ARG_TYPES (fntype);
198 tree raises = TYPE_RAISES_EXCEPTIONS (fntype);
199 tree attrs = TYPE_ATTRIBUTES (fntype);
200 bool late_return_type_p = TYPE_HAS_LATE_RETURN_TYPE (fntype);
202 if (new_ret == error_mark_node)
205 if (same_type_p (new_ret, TREE_TYPE (fntype)))
208 if (TREE_CODE (fntype) == FUNCTION_TYPE)
210 newtype = build_function_type (new_ret, args);
211 newtype = apply_memfn_quals (newtype,
212 type_memfn_quals (fntype),
213 type_memfn_rqual (fntype));
216 newtype = build_method_type_directly
217 (class_of_this_parm (fntype), new_ret, TREE_CHAIN (args));
218 if (FUNCTION_REF_QUALIFIED (fntype))
219 newtype = build_ref_qualified_type (newtype, type_memfn_rqual (fntype));
221 newtype = build_exception_variant (newtype, raises);
223 newtype = cp_build_type_attribute_variant (newtype, attrs);
224 if (late_return_type_p)
225 TYPE_HAS_LATE_RETURN_TYPE (newtype) = 1;
230 /* Build a PARM_DECL of FN with NAME and TYPE, and set DECL_ARG_TYPE
234 cp_build_parm_decl (tree fn, tree name, tree type)
236 tree parm = build_decl (input_location,
237 PARM_DECL, name, type);
238 DECL_CONTEXT (parm) = fn;
240 /* DECL_ARG_TYPE is only used by the back end and the back end never
242 if (!processing_template_decl)
243 DECL_ARG_TYPE (parm) = type_passed_as (type);
248 /* Returns a PARM_DECL of FN for a parameter of the indicated TYPE, with the
252 build_artificial_parm (tree fn, tree name, tree type)
254 tree parm = cp_build_parm_decl (fn, name, type);
255 DECL_ARTIFICIAL (parm) = 1;
256 /* All our artificial parms are implicitly `const'; they cannot be
258 TREE_READONLY (parm) = 1;
262 /* Constructors for types with virtual baseclasses need an "in-charge" flag
263 saying whether this constructor is responsible for initialization of
264 virtual baseclasses or not. All destructors also need this "in-charge"
265 flag, which additionally determines whether or not the destructor should
266 free the memory for the object.
268 This function adds the "in-charge" flag to member function FN if
269 appropriate. It is called from grokclassfn and tsubst.
270 FN must be either a constructor or destructor.
272 The in-charge flag follows the 'this' parameter, and is followed by the
273 VTT parm (if any), then the user-written parms. */
276 maybe_retrofit_in_chrg (tree fn)
278 tree basetype, arg_types, parms, parm, fntype;
280 /* If we've already add the in-charge parameter don't do it again. */
281 if (DECL_HAS_IN_CHARGE_PARM_P (fn))
284 /* When processing templates we can't know, in general, whether or
285 not we're going to have virtual baseclasses. */
286 if (processing_template_decl)
289 /* We don't need an in-charge parameter for constructors that don't
290 have virtual bases. */
291 if (DECL_CONSTRUCTOR_P (fn)
292 && !CLASSTYPE_VBASECLASSES (DECL_CONTEXT (fn)))
295 arg_types = TYPE_ARG_TYPES (TREE_TYPE (fn));
296 basetype = TREE_TYPE (TREE_VALUE (arg_types));
297 arg_types = TREE_CHAIN (arg_types);
299 parms = DECL_CHAIN (DECL_ARGUMENTS (fn));
301 /* If this is a subobject constructor or destructor, our caller will
302 pass us a pointer to our VTT. */
303 if (CLASSTYPE_VBASECLASSES (DECL_CONTEXT (fn)))
305 parm = build_artificial_parm (fn, vtt_parm_identifier, vtt_parm_type);
307 /* First add it to DECL_ARGUMENTS between 'this' and the real args... */
308 DECL_CHAIN (parm) = parms;
311 /* ...and then to TYPE_ARG_TYPES. */
312 arg_types = hash_tree_chain (vtt_parm_type, arg_types);
314 DECL_HAS_VTT_PARM_P (fn) = 1;
317 /* Then add the in-charge parm (before the VTT parm). */
318 parm = build_artificial_parm (fn, in_charge_identifier, integer_type_node);
319 DECL_CHAIN (parm) = parms;
321 arg_types = hash_tree_chain (integer_type_node, arg_types);
323 /* Insert our new parameter(s) into the list. */
324 DECL_CHAIN (DECL_ARGUMENTS (fn)) = parms;
326 /* And rebuild the function type. */
327 fntype = build_method_type_directly (basetype, TREE_TYPE (TREE_TYPE (fn)),
329 if (TYPE_RAISES_EXCEPTIONS (TREE_TYPE (fn)))
330 fntype = build_exception_variant (fntype,
331 TYPE_RAISES_EXCEPTIONS (TREE_TYPE (fn)));
332 if (TYPE_ATTRIBUTES (TREE_TYPE (fn)))
333 fntype = (cp_build_type_attribute_variant
334 (fntype, TYPE_ATTRIBUTES (TREE_TYPE (fn))));
335 TREE_TYPE (fn) = fntype;
337 /* Now we've got the in-charge parameter. */
338 DECL_HAS_IN_CHARGE_PARM_P (fn) = 1;
341 /* Classes overload their constituent function names automatically.
342 When a function name is declared in a record structure,
343 its name is changed to it overloaded name. Since names for
344 constructors and destructors can conflict, we place a leading
347 CNAME is the name of the class we are grokking for.
349 FUNCTION is a FUNCTION_DECL. It was created by `grokdeclarator'.
351 FLAGS contains bits saying what's special about today's
352 arguments. DTOR_FLAG == DESTRUCTOR.
354 If FUNCTION is a destructor, then we must add the `auto-delete' field
355 as a second parameter. There is some hair associated with the fact
356 that we must "declare" this variable in the manner consistent with the
357 way the rest of the arguments were declared.
359 QUALS are the qualifiers for the this pointer. */
362 grokclassfn (tree ctype, tree function, enum overload_flags flags)
364 tree fn_name = DECL_NAME (function);
366 /* Even within an `extern "C"' block, members get C++ linkage. See
367 [dcl.link] for details. */
368 SET_DECL_LANGUAGE (function, lang_cplusplus);
370 if (fn_name == NULL_TREE)
372 error ("name missing for member function");
373 fn_name = get_identifier ("<anonymous>");
374 DECL_NAME (function) = fn_name;
377 DECL_CONTEXT (function) = ctype;
379 if (flags == DTOR_FLAG)
380 DECL_CXX_DESTRUCTOR_P (function) = 1;
382 if (flags == DTOR_FLAG || DECL_CONSTRUCTOR_P (function))
383 maybe_retrofit_in_chrg (function);
386 /* Create an ARRAY_REF, checking for the user doing things backwards
387 along the way. DECLTYPE_P is for N3276, as in the parser. */
390 grok_array_decl (location_t loc, tree array_expr, tree index_exp,
395 tree orig_array_expr = array_expr;
396 tree orig_index_exp = index_exp;
397 tree overload = NULL_TREE;
399 if (error_operand_p (array_expr) || error_operand_p (index_exp))
400 return error_mark_node;
402 if (processing_template_decl)
404 if (type_dependent_expression_p (array_expr)
405 || type_dependent_expression_p (index_exp))
406 return build_min_nt_loc (loc, ARRAY_REF, array_expr, index_exp,
407 NULL_TREE, NULL_TREE);
408 array_expr = build_non_dependent_expr (array_expr);
409 index_exp = build_non_dependent_expr (index_exp);
412 type = TREE_TYPE (array_expr);
414 type = non_reference (type);
416 /* If they have an `operator[]', use that. */
417 if (MAYBE_CLASS_TYPE_P (type) || MAYBE_CLASS_TYPE_P (TREE_TYPE (index_exp)))
419 tsubst_flags_t complain = tf_warning_or_error;
421 complain |= tf_decltype;
422 expr = build_new_op (loc, ARRAY_REF, LOOKUP_NORMAL, array_expr,
423 index_exp, NULL_TREE, &overload, complain);
429 /* Otherwise, create an ARRAY_REF for a pointer or array type.
430 It is a little-known fact that, if `a' is an array and `i' is
431 an int, you can write `i[a]', which means the same thing as
433 if (TREE_CODE (type) == ARRAY_TYPE || VECTOR_TYPE_P (type))
436 p1 = build_expr_type_conversion (WANT_POINTER, array_expr, false);
438 if (TREE_CODE (TREE_TYPE (index_exp)) == ARRAY_TYPE)
441 p2 = build_expr_type_conversion (WANT_POINTER, index_exp, false);
443 i1 = build_expr_type_conversion (WANT_INT | WANT_ENUM, array_expr,
445 i2 = build_expr_type_conversion (WANT_INT | WANT_ENUM, index_exp,
448 if ((p1 && i2) && (i1 && p2))
449 error ("ambiguous conversion for array subscript");
452 array_expr = p1, index_exp = i2;
454 array_expr = p2, index_exp = i1;
457 error ("invalid types %<%T[%T]%> for array subscript",
458 type, TREE_TYPE (index_exp));
459 return error_mark_node;
462 if (array_expr == error_mark_node || index_exp == error_mark_node)
463 error ("ambiguous conversion for array subscript");
465 if (TREE_CODE (TREE_TYPE (array_expr)) == POINTER_TYPE)
466 array_expr = mark_rvalue_use (array_expr);
468 array_expr = mark_lvalue_use_nonread (array_expr);
469 index_exp = mark_rvalue_use (index_exp);
470 expr = build_array_ref (input_location, array_expr, index_exp);
472 if (processing_template_decl && expr != error_mark_node)
474 if (overload != NULL_TREE)
475 return (build_min_non_dep_op_overload
476 (ARRAY_REF, expr, overload, orig_array_expr, orig_index_exp));
478 return build_min_non_dep (ARRAY_REF, expr, orig_array_expr, orig_index_exp,
479 NULL_TREE, NULL_TREE);
484 /* Given the cast expression EXP, checking out its validity. Either return
485 an error_mark_node if there was an unavoidable error, return a cast to
486 void for trying to delete a pointer w/ the value 0, or return the
487 call to delete. If DOING_VEC is true, we handle things differently
488 for doing an array delete.
489 Implements ARM $5.3.4. This is called from the parser. */
492 delete_sanity (tree exp, tree size, bool doing_vec, int use_global_delete,
493 tsubst_flags_t complain)
497 if (exp == error_mark_node)
500 if (processing_template_decl)
502 t = build_min (DELETE_EXPR, void_type_node, exp, size);
503 DELETE_EXPR_USE_GLOBAL (t) = use_global_delete;
504 DELETE_EXPR_USE_VEC (t) = doing_vec;
505 TREE_SIDE_EFFECTS (t) = 1;
509 /* An array can't have been allocated by new, so complain. */
510 if (TREE_CODE (TREE_TYPE (exp)) == ARRAY_TYPE)
511 warning (0, "deleting array %q#E", exp);
513 t = build_expr_type_conversion (WANT_POINTER, exp, true);
515 if (t == NULL_TREE || t == error_mark_node)
517 error ("type %q#T argument given to %<delete%>, expected pointer",
519 return error_mark_node;
522 type = TREE_TYPE (t);
524 /* As of Valley Forge, you can delete a pointer to const. */
526 /* You can't delete functions. */
527 if (TREE_CODE (TREE_TYPE (type)) == FUNCTION_TYPE)
529 error ("cannot delete a function. Only pointer-to-objects are "
530 "valid arguments to %<delete%>");
531 return error_mark_node;
534 /* Deleting ptr to void is undefined behavior [expr.delete/3]. */
535 if (VOID_TYPE_P (TREE_TYPE (type)))
537 warning (OPT_Wdelete_incomplete, "deleting %qT is undefined", type);
541 /* Deleting a pointer with the value zero is valid and has no effect. */
542 if (integer_zerop (t))
543 return build1 (NOP_EXPR, void_type_node, t);
546 return build_vec_delete (t, /*maxindex=*/NULL_TREE,
547 sfk_deleting_destructor,
548 use_global_delete, complain);
550 return build_delete (type, t, sfk_deleting_destructor,
551 LOOKUP_NORMAL, use_global_delete,
555 /* Report an error if the indicated template declaration is not the
556 sort of thing that should be a member template. */
559 check_member_template (tree tmpl)
563 gcc_assert (TREE_CODE (tmpl) == TEMPLATE_DECL);
564 decl = DECL_TEMPLATE_RESULT (tmpl);
566 if (TREE_CODE (decl) == FUNCTION_DECL
567 || DECL_ALIAS_TEMPLATE_P (tmpl)
568 || (TREE_CODE (decl) == TYPE_DECL
569 && MAYBE_CLASS_TYPE_P (TREE_TYPE (decl))))
571 /* The parser rejects template declarations in local classes
572 (with the exception of generic lambdas). */
573 gcc_assert (!current_function_decl || LAMBDA_FUNCTION_P (decl));
574 /* The parser rejects any use of virtual in a function template. */
575 gcc_assert (!(TREE_CODE (decl) == FUNCTION_DECL
576 && DECL_VIRTUAL_P (decl)));
578 /* The debug-information generating code doesn't know what to do
579 with member templates. */
580 DECL_IGNORED_P (tmpl) = 1;
582 else if (variable_template_p (tmpl))
585 error ("template declaration of %q#D", decl);
588 /* Sanity check: report error if this function FUNCTION is not
589 really a member of the class (CTYPE) it is supposed to belong to.
590 TEMPLATE_PARMS is used to specify the template parameters of a member
591 template passed as FUNCTION_DECL. If the member template is passed as a
592 TEMPLATE_DECL, it can be NULL since the parameters can be extracted
593 from the declaration. If the function is not a function template, it
595 It returns the original declaration for the function, NULL_TREE if
596 no declaration was found, error_mark_node if an error was emitted. */
599 check_classfn (tree ctype, tree function, tree template_parms)
601 if (DECL_USE_TEMPLATE (function)
602 && !(TREE_CODE (function) == TEMPLATE_DECL
603 && DECL_TEMPLATE_SPECIALIZATION (function))
604 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (function)))
605 /* Since this is a specialization of a member template,
606 we're not going to find the declaration in the class.
609 struct S { template <typename T> void f(T); };
610 template <> void S::f(int);
612 we're not going to find `S::f(int)', but there's no
613 reason we should, either. We let our callers know we didn't
614 find the method, but we don't complain. */
617 /* Basic sanity check: for a template function, the template parameters
618 either were not passed, or they are the same of DECL_TEMPLATE_PARMS. */
619 if (TREE_CODE (function) == TEMPLATE_DECL)
622 && !comp_template_parms (template_parms,
623 DECL_TEMPLATE_PARMS (function)))
625 error ("template parameter lists provided don%'t match the "
626 "template parameters of %qD", function);
627 return error_mark_node;
629 template_parms = DECL_TEMPLATE_PARMS (function);
632 /* OK, is this a definition of a member template? */
633 bool is_template = (template_parms != NULL_TREE);
637 A destructor shall not be a member template. */
638 if (DECL_DESTRUCTOR_P (function) && is_template)
640 error ("destructor %qD declared as member template", function);
641 return error_mark_node;
644 /* We must enter the scope here, because conversion operators are
645 named by target type, and type equivalence relies on typenames
646 resolving within the scope of CTYPE. */
647 tree pushed_scope = push_scope (ctype);
648 tree matched = NULL_TREE;
649 tree fns = get_class_binding (ctype, DECL_NAME (function));
651 for (ovl_iterator iter (fns); !matched && iter; ++iter)
655 /* A member template definition only matches a member template
657 if (is_template != (TREE_CODE (fndecl) == TEMPLATE_DECL))
660 if (!DECL_DECLARES_FUNCTION_P (fndecl))
663 tree p1 = TYPE_ARG_TYPES (TREE_TYPE (function));
664 tree p2 = TYPE_ARG_TYPES (TREE_TYPE (fndecl));
666 /* We cannot simply call decls_match because this doesn't work
667 for static member functions that are pretending to be
668 methods, and because the name may have been changed by
671 /* Get rid of the this parameter on functions that become
673 if (DECL_STATIC_FUNCTION_P (fndecl)
674 && TREE_CODE (TREE_TYPE (function)) == METHOD_TYPE)
675 p1 = TREE_CHAIN (p1);
677 /* ref-qualifier or absence of same must match. */
678 if (type_memfn_rqual (TREE_TYPE (function))
679 != type_memfn_rqual (TREE_TYPE (fndecl)))
682 // Include constraints in the match.
683 tree c1 = get_constraints (function);
684 tree c2 = get_constraints (fndecl);
686 /* While finding a match, same types and params are not enough
687 if the function is versioned. Also check version ("target")
689 if (same_type_p (TREE_TYPE (TREE_TYPE (function)),
690 TREE_TYPE (TREE_TYPE (fndecl)))
691 && compparms (p1, p2)
692 && !targetm.target_option.function_versions (function, fndecl)
694 || comp_template_parms (template_parms,
695 DECL_TEMPLATE_PARMS (fndecl)))
696 && equivalent_constraints (c1, c2)
697 && (DECL_TEMPLATE_SPECIALIZATION (function)
698 == DECL_TEMPLATE_SPECIALIZATION (fndecl))
699 && (!DECL_TEMPLATE_SPECIALIZATION (function)
700 || (DECL_TI_TEMPLATE (function) == DECL_TI_TEMPLATE (fndecl))))
706 if (!COMPLETE_TYPE_P (ctype))
707 cxx_incomplete_type_error (function, ctype);
710 if (DECL_CONV_FN_P (function))
711 fns = get_class_binding (ctype, conv_op_identifier);
713 error_at (DECL_SOURCE_LOCATION (function),
714 "no declaration matches %q#D", function);
716 print_candidates (fns);
717 else if (DECL_CONV_FN_P (function))
718 inform (DECL_SOURCE_LOCATION (function),
719 "no conversion operators declared");
721 inform (DECL_SOURCE_LOCATION (function),
722 "no functions named %qD", function);
723 inform (DECL_SOURCE_LOCATION (TYPE_NAME (ctype)),
724 "%#qT defined here", ctype);
726 matched = error_mark_node;
730 pop_scope (pushed_scope);
735 /* DECL is a function with vague linkage. Remember it so that at the
736 end of the translation unit we can decide whether or not to emit
740 note_vague_linkage_fn (tree decl)
742 if (processing_template_decl)
745 DECL_DEFER_OUTPUT (decl) = 1;
746 vec_safe_push (deferred_fns, decl);
749 /* As above, but for variable template instantiations. */
752 note_variable_template_instantiation (tree decl)
754 vec_safe_push (pending_statics, decl);
757 /* We have just processed the DECL, which is a static data member.
758 The other parameters are as for cp_finish_decl. */
761 finish_static_data_member_decl (tree decl,
762 tree init, bool init_const_expr_p,
766 DECL_CONTEXT (decl) = current_class_type;
768 /* We cannot call pushdecl here, because that would fill in the
769 TREE_CHAIN of our decl. Instead, we modify cp_finish_decl to do
770 the right thing, namely, to put this decl out straight away. */
772 if (! processing_template_decl)
773 vec_safe_push (pending_statics, decl);
775 if (LOCAL_CLASS_P (current_class_type)
776 /* We already complained about the template definition. */
777 && !DECL_TEMPLATE_INSTANTIATION (decl))
778 permerror (input_location, "local class %q#T shall not have static data member %q#D",
779 current_class_type, decl);
781 for (tree t = current_class_type; TYPE_P (t);
782 t = CP_TYPE_CONTEXT (t))
783 if (TYPE_UNNAMED_P (t))
785 if (permerror (DECL_SOURCE_LOCATION (decl),
786 "static data member %qD in unnamed class", decl))
787 inform (DECL_SOURCE_LOCATION (TYPE_NAME (t)),
788 "unnamed class defined here");
792 DECL_IN_AGGR_P (decl) = 1;
794 if (TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE
795 && TYPE_DOMAIN (TREE_TYPE (decl)) == NULL_TREE)
796 SET_VAR_HAD_UNKNOWN_BOUND (decl);
800 /* Similarly to start_decl_1, we want to complete the type in order
801 to do the right thing in cp_apply_type_quals_to_decl, possibly
802 clear TYPE_QUAL_CONST (c++/65579). */
803 tree type = TREE_TYPE (decl) = complete_type (TREE_TYPE (decl));
804 cp_apply_type_quals_to_decl (cp_type_quals (type), decl);
807 cp_finish_decl (decl, init, init_const_expr_p, asmspec_tree, flags);
810 /* DECLARATOR and DECLSPECS correspond to a class member. The other
811 parameters are as for cp_finish_decl. Return the DECL for the
812 class member declared. */
815 grokfield (const cp_declarator *declarator,
816 cp_decl_specifier_seq *declspecs,
817 tree init, bool init_const_expr_p,
822 const char *asmspec = 0;
827 && TREE_CODE (init) == TREE_LIST
828 && TREE_VALUE (init) == error_mark_node
829 && TREE_CHAIN (init) == NULL_TREE)
832 value = grokdeclarator (declarator, declspecs, FIELD, init != 0, &attrlist);
833 if (! value || value == error_mark_node)
834 /* friend or constructor went bad. */
835 return error_mark_node;
836 if (TREE_TYPE (value) == error_mark_node)
839 if (TREE_CODE (value) == TYPE_DECL && init)
841 error ("typedef %qD is initialized (use decltype instead)", value);
845 /* Pass friendly classes back. */
846 if (value == void_type_node)
850 name = DECL_NAME (value);
852 if (name != NULL_TREE)
854 if (TREE_CODE (name) == TEMPLATE_ID_EXPR)
856 error ("explicit template argument list not allowed");
857 return error_mark_node;
860 if (IDENTIFIER_POINTER (name)[0] == '_'
861 && id_equal (name, "_vptr"))
862 error ("member %qD conflicts with virtual function table field name",
866 /* Stash away type declarations. */
867 if (TREE_CODE (value) == TYPE_DECL)
869 DECL_NONLOCAL (value) = 1;
870 DECL_CONTEXT (value) = current_class_type;
876 /* If this is a typedef that names the class for linkage purposes
877 (7.1.3p8), apply any attributes directly to the type. */
878 if (OVERLOAD_TYPE_P (TREE_TYPE (value))
879 && value == TYPE_NAME (TYPE_MAIN_VARIANT (TREE_TYPE (value))))
880 attrflags = ATTR_FLAG_TYPE_IN_PLACE;
882 cplus_decl_attributes (&value, attrlist, attrflags);
885 if (decl_spec_seq_has_spec_p (declspecs, ds_typedef)
886 && TREE_TYPE (value) != error_mark_node
887 && TYPE_NAME (TYPE_MAIN_VARIANT (TREE_TYPE (value))) != value)
888 set_underlying_type (value);
890 /* It's important that push_template_decl below follows
891 set_underlying_type above so that the created template
892 carries the properly set type of VALUE. */
893 if (processing_template_decl)
894 value = push_template_decl (value);
896 record_locally_defined_typedef (value);
900 int friendp = decl_spec_seq_has_spec_p (declspecs, ds_friend);
902 if (!friendp && DECL_IN_AGGR_P (value))
904 error ("%qD is already defined in %qT", value, DECL_CONTEXT (value));
905 return void_type_node;
908 if (asmspec_tree && asmspec_tree != error_mark_node)
909 asmspec = TREE_STRING_POINTER (asmspec_tree);
913 if (TREE_CODE (value) == FUNCTION_DECL)
915 if (init == ridpointers[(int)RID_DELETE])
917 if (friendp && decl_defined_p (value))
919 error ("redefinition of %q#D", value);
920 inform (DECL_SOURCE_LOCATION (value),
921 "%q#D previously defined here", value);
925 DECL_DELETED_FN (value) = 1;
926 DECL_DECLARED_INLINE_P (value) = 1;
927 DECL_INITIAL (value) = error_mark_node;
930 else if (init == ridpointers[(int)RID_DEFAULT])
932 if (defaultable_fn_check (value))
934 DECL_DEFAULTED_FN (value) = 1;
935 DECL_INITIALIZED_IN_CLASS_P (value) = 1;
936 DECL_DECLARED_INLINE_P (value) = 1;
939 else if (TREE_CODE (init) == DEFAULT_ARG)
940 error ("invalid initializer for member function %qD", value);
941 else if (TREE_CODE (TREE_TYPE (value)) == METHOD_TYPE)
943 if (integer_zerop (init))
944 DECL_PURE_VIRTUAL_P (value) = 1;
945 else if (error_operand_p (init))
946 ; /* An error has already been reported. */
948 error ("invalid initializer for member function %qD",
953 gcc_assert (TREE_CODE (TREE_TYPE (value)) == FUNCTION_TYPE);
955 error ("initializer specified for friend function %qD",
958 error ("initializer specified for static member function %qD",
962 else if (TREE_CODE (value) == FIELD_DECL)
963 /* C++11 NSDMI, keep going. */;
964 else if (!VAR_P (value))
968 /* Pass friend decls back. */
969 if ((TREE_CODE (value) == FUNCTION_DECL
970 || TREE_CODE (value) == TEMPLATE_DECL)
971 && DECL_CONTEXT (value) != current_class_type)
974 /* Need to set this before push_template_decl. */
976 DECL_CONTEXT (value) = current_class_type;
978 if (processing_template_decl && VAR_OR_FUNCTION_DECL_P (value))
980 value = push_template_decl (value);
981 if (error_operand_p (value))
982 return error_mark_node;
986 cplus_decl_attributes (&value, attrlist, 0);
988 if (init && DIRECT_LIST_INIT_P (init))
989 flags = LOOKUP_NORMAL;
991 flags = LOOKUP_IMPLICIT;
993 switch (TREE_CODE (value))
996 finish_static_data_member_decl (value, init, init_const_expr_p,
997 asmspec_tree, flags);
1002 error ("%<asm%> specifiers are not permitted on non-static data members");
1003 if (DECL_INITIAL (value) == error_mark_node)
1004 init = error_mark_node;
1005 cp_finish_decl (value, init, /*init_const_expr_p=*/false,
1007 DECL_IN_AGGR_P (value) = 1;
1012 set_user_assembler_name (value, asmspec);
1014 cp_finish_decl (value,
1016 /*init_const_expr_p=*/false,
1017 asmspec_tree, flags);
1019 /* Pass friends back this way. */
1020 if (DECL_FRIEND_P (value))
1021 return void_type_node;
1023 DECL_IN_AGGR_P (value) = 1;
1032 /* Like `grokfield', but for bitfields.
1033 WIDTH is the width of the bitfield, a constant expression.
1034 The other parameters are as for grokfield. */
1037 grokbitfield (const cp_declarator *declarator,
1038 cp_decl_specifier_seq *declspecs, tree width, tree init,
1041 tree value = grokdeclarator (declarator, declspecs, BITFIELD,
1042 init != NULL_TREE, &attrlist);
1044 if (value == error_mark_node)
1045 return NULL_TREE; /* friends went bad. */
1046 if (TREE_TYPE (value) == error_mark_node)
1049 /* Pass friendly classes back. */
1050 if (VOID_TYPE_P (value))
1051 return void_type_node;
1053 if (!INTEGRAL_OR_ENUMERATION_TYPE_P (TREE_TYPE (value))
1054 && (POINTER_TYPE_P (value)
1055 || !dependent_type_p (TREE_TYPE (value))))
1057 error ("bit-field %qD with non-integral type", value);
1058 return error_mark_node;
1061 if (TREE_CODE (value) == TYPE_DECL)
1063 error ("cannot declare %qD to be a bit-field type", value);
1067 /* Usually, finish_struct_1 catches bitfields with invalid types.
1068 But, in the case of bitfields with function type, we confuse
1069 ourselves into thinking they are member functions, so we must
1071 if (TREE_CODE (value) == FUNCTION_DECL)
1073 error ("cannot declare bit-field %qD with function type",
1078 if (width && TYPE_WARN_IF_NOT_ALIGN (TREE_TYPE (value)))
1080 error ("cannot declare bit-field %qD with %<warn_if_not_aligned%> type",
1085 if (DECL_IN_AGGR_P (value))
1087 error ("%qD is already defined in the class %qT", value,
1088 DECL_CONTEXT (value));
1089 return void_type_node;
1092 if (TREE_STATIC (value))
1094 error ("static member %qD cannot be a bit-field", value);
1098 int flags = LOOKUP_IMPLICIT;
1099 if (init && DIRECT_LIST_INIT_P (init))
1100 flags = LOOKUP_NORMAL;
1101 cp_finish_decl (value, init, false, NULL_TREE, flags);
1103 if (width != error_mark_node)
1105 /* The width must be an integer type. */
1106 if (!type_dependent_expression_p (width)
1107 && !INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (TREE_TYPE (width)))
1108 error ("width of bit-field %qD has non-integral type %qT", value,
1112 /* Temporarily stash the width in DECL_BIT_FIELD_REPRESENTATIVE.
1113 check_bitfield_decl picks it from there later and sets DECL_SIZE
1115 DECL_BIT_FIELD_REPRESENTATIVE (value) = width;
1116 SET_DECL_C_BIT_FIELD (value);
1120 DECL_IN_AGGR_P (value) = 1;
1123 cplus_decl_attributes (&value, attrlist, /*flags=*/0);
1129 /* Returns true iff ATTR is an attribute which needs to be applied at
1130 instantiation time rather than template definition time. */
1133 is_late_template_attribute (tree attr, tree decl)
1135 tree name = get_attribute_name (attr);
1136 tree args = TREE_VALUE (attr);
1137 const struct attribute_spec *spec = lookup_attribute_spec (name);
1141 /* Unknown attribute. */
1144 /* Attribute weak handling wants to write out assembly right away. */
1145 if (is_attribute_p ("weak", name))
1148 /* Attributes used and unused are applied directly to typedefs for the
1149 benefit of maybe_warn_unused_local_typedefs. */
1150 if (TREE_CODE (decl) == TYPE_DECL
1151 && (is_attribute_p ("unused", name)
1152 || is_attribute_p ("used", name)))
1155 /* Attribute tls_model wants to modify the symtab. */
1156 if (is_attribute_p ("tls_model", name))
1159 /* #pragma omp declare simd attribute needs to be always deferred. */
1161 && is_attribute_p ("omp declare simd", name))
1164 /* An attribute pack is clearly dependent. */
1165 if (args && PACK_EXPANSION_P (args))
1168 /* If any of the arguments are dependent expressions, we can't evaluate
1169 the attribute until instantiation time. */
1170 for (arg = args; arg; arg = TREE_CHAIN (arg))
1172 tree t = TREE_VALUE (arg);
1174 /* If the first attribute argument is an identifier, only consider
1175 second and following arguments. Attributes like mode, format,
1176 cleanup and several target specific attributes aren't late
1177 just because they have an IDENTIFIER_NODE as first argument. */
1178 if (arg == args && attribute_takes_identifier_p (name)
1179 && identifier_p (t))
1182 if (value_dependent_expression_p (t)
1183 || type_dependent_expression_p (t))
1187 if (TREE_CODE (decl) == TYPE_DECL
1189 || spec->type_required)
1191 tree type = TYPE_P (decl) ? decl : TREE_TYPE (decl);
1193 /* We can't apply any attributes to a completely unknown type until
1194 instantiation time. */
1195 enum tree_code code = TREE_CODE (type);
1196 if (code == TEMPLATE_TYPE_PARM
1197 || code == BOUND_TEMPLATE_TEMPLATE_PARM
1198 || code == TYPENAME_TYPE)
1200 /* Also defer most attributes on dependent types. This is not
1201 necessary in all cases, but is the better default. */
1202 else if (dependent_type_p (type)
1203 /* But some attributes specifically apply to templates. */
1204 && !is_attribute_p ("abi_tag", name)
1205 && !is_attribute_p ("deprecated", name)
1206 && !is_attribute_p ("visibility", name))
1215 /* ATTR_P is a list of attributes. Remove any attributes which need to be
1216 applied at instantiation time and return them. If IS_DEPENDENT is true,
1217 the declaration itself is dependent, so all attributes should be applied
1218 at instantiation time. */
1221 splice_template_attributes (tree *attr_p, tree decl)
1224 tree late_attrs = NULL_TREE;
1225 tree *q = &late_attrs;
1232 if (is_late_template_attribute (*p, decl))
1234 ATTR_IS_DEPENDENT (*p) = 1;
1236 *p = TREE_CHAIN (*p);
1237 q = &TREE_CHAIN (*q);
1241 p = &TREE_CHAIN (*p);
1247 /* Remove any late attributes from the list in ATTR_P and attach them to
1251 save_template_attributes (tree *attr_p, tree *decl_p, int flags)
1255 if (attr_p && *attr_p == error_mark_node)
1258 tree late_attrs = splice_template_attributes (attr_p, *decl_p);
1262 if (DECL_P (*decl_p))
1263 q = &DECL_ATTRIBUTES (*decl_p);
1265 q = &TYPE_ATTRIBUTES (*decl_p);
1267 tree old_attrs = *q;
1269 /* Merge the late attributes at the beginning with the attribute
1271 late_attrs = merge_attributes (late_attrs, *q);
1272 if (*q != late_attrs
1273 && !DECL_P (*decl_p)
1274 && !(flags & ATTR_FLAG_TYPE_IN_PLACE))
1276 if (!dependent_type_p (*decl_p))
1277 *decl_p = cp_build_type_attribute_variant (*decl_p, late_attrs);
1280 *decl_p = build_variant_type_copy (*decl_p);
1281 TYPE_ATTRIBUTES (*decl_p) = late_attrs;
1287 if (!DECL_P (*decl_p) && *decl_p == TYPE_MAIN_VARIANT (*decl_p))
1289 /* We've added new attributes directly to the main variant, so
1290 now we need to update all of the other variants to include
1291 these new attributes. */
1293 for (variant = TYPE_NEXT_VARIANT (*decl_p); variant;
1294 variant = TYPE_NEXT_VARIANT (variant))
1296 gcc_assert (TYPE_ATTRIBUTES (variant) == old_attrs);
1297 TYPE_ATTRIBUTES (variant) = TYPE_ATTRIBUTES (*decl_p);
1302 /* True if ATTRS contains any dependent attributes that affect type
1306 any_dependent_type_attributes_p (tree attrs)
1308 for (tree a = attrs; a; a = TREE_CHAIN (a))
1309 if (ATTR_IS_DEPENDENT (a))
1311 const attribute_spec *as = lookup_attribute_spec (TREE_PURPOSE (a));
1312 if (as && as->affects_type_identity)
1318 /* Return true iff ATTRS are acceptable attributes to be applied in-place
1319 to a typedef which gives a previously unnamed class or enum a name for
1320 linkage purposes. */
1323 attributes_naming_typedef_ok (tree attrs)
1325 for (; attrs; attrs = TREE_CHAIN (attrs))
1327 tree name = get_attribute_name (attrs);
1328 if (is_attribute_p ("vector_size", name))
1334 /* Like reconstruct_complex_type, but handle also template trees. */
1337 cp_reconstruct_complex_type (tree type, tree bottom)
1340 bool late_return_type_p = false;
1342 if (TYPE_PTR_P (type))
1344 inner = cp_reconstruct_complex_type (TREE_TYPE (type), bottom);
1345 outer = build_pointer_type_for_mode (inner, TYPE_MODE (type),
1346 TYPE_REF_CAN_ALIAS_ALL (type));
1348 else if (TREE_CODE (type) == REFERENCE_TYPE)
1350 inner = cp_reconstruct_complex_type (TREE_TYPE (type), bottom);
1351 outer = build_reference_type_for_mode (inner, TYPE_MODE (type),
1352 TYPE_REF_CAN_ALIAS_ALL (type));
1354 else if (TREE_CODE (type) == ARRAY_TYPE)
1356 inner = cp_reconstruct_complex_type (TREE_TYPE (type), bottom);
1357 outer = build_cplus_array_type (inner, TYPE_DOMAIN (type));
1358 /* Don't call cp_build_qualified_type on ARRAY_TYPEs, the
1359 element type qualification will be handled by the recursive
1360 cp_reconstruct_complex_type call and cp_build_qualified_type
1361 for ARRAY_TYPEs changes the element type. */
1364 else if (TREE_CODE (type) == FUNCTION_TYPE)
1366 late_return_type_p = TYPE_HAS_LATE_RETURN_TYPE (type);
1367 inner = cp_reconstruct_complex_type (TREE_TYPE (type), bottom);
1368 outer = build_function_type (inner, TYPE_ARG_TYPES (type));
1369 outer = apply_memfn_quals (outer,
1370 type_memfn_quals (type),
1371 type_memfn_rqual (type));
1373 else if (TREE_CODE (type) == METHOD_TYPE)
1375 late_return_type_p = TYPE_HAS_LATE_RETURN_TYPE (type);
1376 inner = cp_reconstruct_complex_type (TREE_TYPE (type), bottom);
1377 /* The build_method_type_directly() routine prepends 'this' to argument list,
1378 so we must compensate by getting rid of it. */
1380 = build_method_type_directly
1381 (class_of_this_parm (type), inner,
1382 TREE_CHAIN (TYPE_ARG_TYPES (type)));
1384 else if (TREE_CODE (type) == OFFSET_TYPE)
1386 inner = cp_reconstruct_complex_type (TREE_TYPE (type), bottom);
1387 outer = build_offset_type (TYPE_OFFSET_BASETYPE (type), inner);
1392 if (TYPE_ATTRIBUTES (type))
1393 outer = cp_build_type_attribute_variant (outer, TYPE_ATTRIBUTES (type));
1394 outer = cp_build_qualified_type (outer, cp_type_quals (type));
1396 if (late_return_type_p)
1397 TYPE_HAS_LATE_RETURN_TYPE (outer) = 1;
1402 /* Replaces any constexpr expression that may be into the attributes
1403 arguments with their reduced value. */
1406 cp_check_const_attributes (tree attributes)
1408 if (attributes == error_mark_node)
1412 for (attr = attributes; attr; attr = TREE_CHAIN (attr))
1415 for (arg = TREE_VALUE (attr); arg; arg = TREE_CHAIN (arg))
1417 tree expr = TREE_VALUE (arg);
1419 TREE_VALUE (arg) = fold_non_dependent_expr (expr);
1424 /* Return true if TYPE is an OpenMP mappable type. */
1426 cp_omp_mappable_type (tree type)
1428 /* Mappable type has to be complete. */
1429 if (type == error_mark_node || !COMPLETE_TYPE_P (type))
1431 /* Arrays have mappable type if the elements have mappable type. */
1432 while (TREE_CODE (type) == ARRAY_TYPE)
1433 type = TREE_TYPE (type);
1434 /* A mappable type cannot contain virtual members. */
1435 if (CLASS_TYPE_P (type) && CLASSTYPE_VTABLES (type))
1437 /* All data members must be non-static. */
1438 if (CLASS_TYPE_P (type))
1441 for (field = TYPE_FIELDS (type); field; field = DECL_CHAIN (field))
1444 /* All fields must have mappable types. */
1445 else if (TREE_CODE (field) == FIELD_DECL
1446 && !cp_omp_mappable_type (TREE_TYPE (field)))
1452 /* Return the last pushed declaration for the symbol DECL or NULL
1453 when no such declaration exists. */
1456 find_last_decl (tree decl)
1458 tree last_decl = NULL_TREE;
1460 if (tree name = DECL_P (decl) ? DECL_NAME (decl) : NULL_TREE)
1462 /* Look up the declaration in its scope. */
1463 tree pushed_scope = NULL_TREE;
1464 if (tree ctype = DECL_CONTEXT (decl))
1465 pushed_scope = push_scope (ctype);
1467 last_decl = lookup_name (name);
1470 pop_scope (pushed_scope);
1472 /* The declaration may be a member conversion operator
1473 or a bunch of overfloads (handle the latter below). */
1474 if (last_decl && BASELINK_P (last_decl))
1475 last_decl = BASELINK_FUNCTIONS (last_decl);
1481 if (DECL_P (last_decl) || TREE_CODE (last_decl) == OVERLOAD)
1483 /* A set of overloads of the same function. */
1484 for (lkp_iterator iter (last_decl); iter; ++iter)
1486 if (TREE_CODE (*iter) == OVERLOAD)
1489 if (decls_match (decl, *iter, /*record_decls=*/false))
1498 /* Like decl_attributes, but handle C++ complexity. */
1501 cplus_decl_attributes (tree *decl, tree attributes, int flags)
1503 if (*decl == NULL_TREE || *decl == void_type_node
1504 || *decl == error_mark_node)
1507 /* Add implicit "omp declare target" attribute if requested. */
1508 if (scope_chain->omp_declare_target_attribute
1510 && (TREE_STATIC (*decl) || DECL_EXTERNAL (*decl)))
1511 || TREE_CODE (*decl) == FUNCTION_DECL))
1514 && DECL_CLASS_SCOPE_P (*decl))
1515 error ("%q+D static data member inside of declare target directive",
1517 else if (VAR_P (*decl)
1518 && (processing_template_decl
1519 || !cp_omp_mappable_type (TREE_TYPE (*decl))))
1520 attributes = tree_cons (get_identifier ("omp declare target implicit"),
1521 NULL_TREE, attributes);
1523 attributes = tree_cons (get_identifier ("omp declare target"),
1524 NULL_TREE, attributes);
1527 if (processing_template_decl)
1529 if (check_for_bare_parameter_packs (attributes))
1532 save_template_attributes (&attributes, decl, flags);
1535 cp_check_const_attributes (attributes);
1537 if (TREE_CODE (*decl) == TEMPLATE_DECL)
1538 decl = &DECL_TEMPLATE_RESULT (*decl);
1540 if (TREE_TYPE (*decl) && TYPE_PTRMEMFUNC_P (TREE_TYPE (*decl)))
1543 = decl_attributes (decl, attributes, flags | ATTR_FLAG_FUNCTION_NEXT);
1544 decl_attributes (&TYPE_PTRMEMFUNC_FN_TYPE_RAW (TREE_TYPE (*decl)),
1549 tree last_decl = find_last_decl (*decl);
1550 decl_attributes (decl, attributes, flags, last_decl);
1553 if (TREE_CODE (*decl) == TYPE_DECL)
1554 SET_IDENTIFIER_TYPE_VALUE (DECL_NAME (*decl), TREE_TYPE (*decl));
1556 /* Propagate deprecation out to the template. */
1557 if (TREE_DEPRECATED (*decl))
1558 if (tree ti = get_template_info (*decl))
1560 tree tmpl = TI_TEMPLATE (ti);
1561 tree pattern = (TYPE_P (*decl) ? TREE_TYPE (tmpl)
1562 : DECL_TEMPLATE_RESULT (tmpl));
1563 if (*decl == pattern)
1564 TREE_DEPRECATED (tmpl) = true;
1568 /* Walks through the namespace- or function-scope anonymous union
1569 OBJECT, with the indicated TYPE, building appropriate VAR_DECLs.
1570 Returns one of the fields for use in the mangled name. */
1573 build_anon_union_vars (tree type, tree object)
1575 tree main_decl = NULL_TREE;
1578 /* Rather than write the code to handle the non-union case,
1579 just give an error. */
1580 if (TREE_CODE (type) != UNION_TYPE)
1582 error ("anonymous struct not inside named type");
1583 return error_mark_node;
1586 for (field = TYPE_FIELDS (type);
1588 field = DECL_CHAIN (field))
1593 if (DECL_ARTIFICIAL (field))
1595 if (TREE_CODE (field) != FIELD_DECL)
1597 permerror (DECL_SOURCE_LOCATION (field),
1598 "%q#D invalid; an anonymous union can only "
1599 "have non-static data members", field);
1603 if (TREE_PRIVATE (field))
1604 permerror (DECL_SOURCE_LOCATION (field),
1605 "private member %q#D in anonymous union", field);
1606 else if (TREE_PROTECTED (field))
1607 permerror (DECL_SOURCE_LOCATION (field),
1608 "protected member %q#D in anonymous union", field);
1610 if (processing_template_decl)
1611 ref = build_min_nt_loc (UNKNOWN_LOCATION, COMPONENT_REF, object,
1612 DECL_NAME (field), NULL_TREE);
1614 ref = build_class_member_access_expr (object, field, NULL_TREE,
1615 false, tf_warning_or_error);
1617 if (DECL_NAME (field))
1621 decl = build_decl (input_location,
1622 VAR_DECL, DECL_NAME (field), TREE_TYPE (field));
1623 DECL_ANON_UNION_VAR_P (decl) = 1;
1624 DECL_ARTIFICIAL (decl) = 1;
1626 base = get_base_address (object);
1627 TREE_PUBLIC (decl) = TREE_PUBLIC (base);
1628 TREE_STATIC (decl) = TREE_STATIC (base);
1629 DECL_EXTERNAL (decl) = DECL_EXTERNAL (base);
1631 SET_DECL_VALUE_EXPR (decl, ref);
1632 DECL_HAS_VALUE_EXPR_P (decl) = 1;
1634 decl = pushdecl (decl);
1636 else if (ANON_AGGR_TYPE_P (TREE_TYPE (field)))
1637 decl = build_anon_union_vars (TREE_TYPE (field), ref);
1641 if (main_decl == NULL_TREE)
1648 /* Finish off the processing of a UNION_TYPE structure. If the union is an
1649 anonymous union, then all members must be laid out together. PUBLIC_P
1650 is nonzero if this union is not declared static. */
1653 finish_anon_union (tree anon_union_decl)
1659 if (anon_union_decl == error_mark_node)
1662 type = TREE_TYPE (anon_union_decl);
1663 public_p = TREE_PUBLIC (anon_union_decl);
1665 /* The VAR_DECL's context is the same as the TYPE's context. */
1666 DECL_CONTEXT (anon_union_decl) = DECL_CONTEXT (TYPE_NAME (type));
1668 if (TYPE_FIELDS (type) == NULL_TREE)
1673 error ("namespace-scope anonymous aggregates must be static");
1677 main_decl = build_anon_union_vars (type, anon_union_decl);
1678 if (main_decl == error_mark_node)
1680 if (main_decl == NULL_TREE)
1682 pedwarn (input_location, 0, "anonymous union with no members");
1686 if (!processing_template_decl)
1688 /* Use main_decl to set the mangled name. */
1689 DECL_NAME (anon_union_decl) = DECL_NAME (main_decl);
1690 maybe_commonize_var (anon_union_decl);
1691 if (TREE_STATIC (anon_union_decl) || DECL_EXTERNAL (anon_union_decl))
1692 mangle_decl (anon_union_decl);
1693 DECL_NAME (anon_union_decl) = NULL_TREE;
1696 pushdecl (anon_union_decl);
1697 cp_finish_decl (anon_union_decl, NULL_TREE, false, NULL_TREE, 0);
1700 /* Auxiliary functions to make type signatures for
1701 `operator new' and `operator delete' correspond to
1702 what compiler will be expecting. */
1705 coerce_new_type (tree type)
1708 tree args = TYPE_ARG_TYPES (type);
1710 gcc_assert (TREE_CODE (type) == FUNCTION_TYPE);
1712 if (!same_type_p (TREE_TYPE (type), ptr_type_node))
1715 error ("%<operator new%> must return type %qT", ptr_type_node);
1718 if (args && args != void_list_node)
1720 if (TREE_PURPOSE (args))
1722 /* [basic.stc.dynamic.allocation]
1724 The first parameter shall not have an associated default
1726 error ("the first parameter of %<operator new%> cannot "
1727 "have a default argument");
1728 /* Throw away the default argument. */
1729 TREE_PURPOSE (args) = NULL_TREE;
1732 if (!same_type_p (TREE_VALUE (args), size_type_node))
1735 args = TREE_CHAIN (args);
1742 permerror (input_location, "%<operator new%> takes type %<size_t%> (%qT) "
1743 "as first parameter", size_type_node);
1748 args = tree_cons (NULL_TREE, size_type_node, args);
1751 type = build_exception_variant
1752 (build_function_type (ptr_type_node, args),
1753 TYPE_RAISES_EXCEPTIONS (type));
1761 coerce_delete_type (tree type)
1764 tree args = TYPE_ARG_TYPES (type);
1766 gcc_assert (TREE_CODE (type) == FUNCTION_TYPE);
1768 if (!same_type_p (TREE_TYPE (type), void_type_node))
1771 error ("%<operator delete%> must return type %qT", void_type_node);
1774 if (!args || args == void_list_node
1775 || !same_type_p (TREE_VALUE (args), ptr_type_node))
1778 if (args && args != void_list_node)
1779 args = TREE_CHAIN (args);
1780 error ("%<operator delete%> takes type %qT as first parameter",
1786 args = tree_cons (NULL_TREE, ptr_type_node, args);
1789 type = build_exception_variant
1790 (build_function_type (void_type_node, args),
1791 TYPE_RAISES_EXCEPTIONS (type));
1799 /* DECL is a VAR_DECL for a vtable: walk through the entries in the vtable
1800 and mark them as needed. */
1803 mark_vtable_entries (tree decl)
1806 unsigned HOST_WIDE_INT idx;
1808 /* It's OK for the vtable to refer to deprecated virtual functions. */
1809 warning_sentinel w(warn_deprecated_decl);
1811 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (DECL_INITIAL (decl)),
1816 STRIP_NOPS (fnaddr);
1818 if (TREE_CODE (fnaddr) != ADDR_EXPR
1819 && TREE_CODE (fnaddr) != FDESC_EXPR)
1820 /* This entry is an offset: a virtual base class offset, a
1821 virtual call offset, an RTTI offset, etc. */
1824 fn = TREE_OPERAND (fnaddr, 0);
1825 TREE_ADDRESSABLE (fn) = 1;
1826 /* When we don't have vcall offsets, we output thunks whenever
1827 we output the vtables that contain them. With vcall offsets,
1828 we know all the thunks we'll need when we emit a virtual
1829 function, so we emit the thunks there instead. */
1830 if (DECL_THUNK_P (fn))
1831 use_thunk (fn, /*emit_p=*/0);
1832 /* Set the location, as marking the function could cause
1833 instantiation. We do not need to preserve the incoming
1834 location, as we're called from c_parse_final_cleanups, which
1835 takes care of that. */
1836 input_location = DECL_SOURCE_LOCATION (fn);
1841 /* Set DECL up to have the closest approximation of "initialized common"
1842 linkage available. */
1845 comdat_linkage (tree decl)
1848 make_decl_one_only (decl, cxx_comdat_group (decl));
1849 else if (TREE_CODE (decl) == FUNCTION_DECL
1850 || (VAR_P (decl) && DECL_ARTIFICIAL (decl)))
1851 /* We can just emit function and compiler-generated variables
1852 statically; having multiple copies is (for the most part) only
1855 There are two correctness issues, however: the address of a
1856 template instantiation with external linkage should be the
1857 same, independent of what translation unit asks for the
1858 address, and this will not hold when we emit multiple copies of
1859 the function. However, there's little else we can do.
1861 Also, by default, the typeinfo implementation assumes that
1862 there will be only one copy of the string used as the name for
1863 each type. Therefore, if weak symbols are unavailable, the
1864 run-time library should perform a more conservative check; it
1865 should perform a string comparison, rather than an address
1867 TREE_PUBLIC (decl) = 0;
1870 /* Static data member template instantiations, however, cannot
1871 have multiple copies. */
1872 if (DECL_INITIAL (decl) == 0
1873 || DECL_INITIAL (decl) == error_mark_node)
1874 DECL_COMMON (decl) = 1;
1875 else if (EMPTY_CONSTRUCTOR_P (DECL_INITIAL (decl)))
1877 DECL_COMMON (decl) = 1;
1878 DECL_INITIAL (decl) = error_mark_node;
1880 else if (!DECL_EXPLICIT_INSTANTIATION (decl))
1882 /* We can't do anything useful; leave vars for explicit
1884 DECL_EXTERNAL (decl) = 1;
1885 DECL_NOT_REALLY_EXTERN (decl) = 0;
1889 if (TREE_PUBLIC (decl))
1890 DECL_COMDAT (decl) = 1;
1893 /* For win32 we also want to put explicit instantiations in
1894 linkonce sections, so that they will be merged with implicit
1895 instantiations; otherwise we get duplicate symbol errors.
1896 For Darwin we do not want explicit instantiations to be
1900 maybe_make_one_only (tree decl)
1902 /* We used to say that this was not necessary on targets that support weak
1903 symbols, because the implicit instantiations will defer to the explicit
1904 one. However, that's not actually the case in SVR4; a strong definition
1905 after a weak one is an error. Also, not making explicit
1906 instantiations one_only means that we can end up with two copies of
1907 some template instantiations. */
1911 /* We can't set DECL_COMDAT on functions, or cp_finish_file will think
1912 we can get away with not emitting them if they aren't used. We need
1913 to for variables so that cp_finish_decl will update their linkage,
1914 because their DECL_INITIAL may not have been set properly yet. */
1916 if (!TARGET_WEAK_NOT_IN_ARCHIVE_TOC
1917 || (! DECL_EXPLICIT_INSTANTIATION (decl)
1918 && ! DECL_TEMPLATE_SPECIALIZATION (decl)))
1920 make_decl_one_only (decl, cxx_comdat_group (decl));
1924 varpool_node *node = varpool_node::get_create (decl);
1925 DECL_COMDAT (decl) = 1;
1926 /* Mark it needed so we don't forget to emit it. */
1927 node->forced_by_abi = true;
1928 TREE_USED (decl) = 1;
1933 /* Returns true iff DECL, a FUNCTION_DECL or VAR_DECL, has vague linkage.
1934 This predicate will give the right answer during parsing of the
1935 function, which other tests may not. */
1938 vague_linkage_p (tree decl)
1940 if (!TREE_PUBLIC (decl))
1942 /* maybe_thunk_body clears TREE_PUBLIC and DECL_ABSTRACT_P on the
1943 maybe-in-charge 'tor variants; in that case we need to check one of
1944 the "clones" for the real linkage. But only in that case; before
1945 maybe_clone_body we haven't yet copied the linkage to the clones. */
1946 if ((DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P (decl)
1947 || DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (decl))
1948 && !DECL_ABSTRACT_P (decl)
1949 && DECL_CHAIN (decl)
1950 && DECL_CLONED_FUNCTION_P (DECL_CHAIN (decl)))
1951 return vague_linkage_p (DECL_CHAIN (decl));
1953 gcc_checking_assert (!DECL_COMDAT (decl));
1956 /* Unfortunately, import_export_decl has not always been called
1957 before the function is processed, so we cannot simply check
1959 if (DECL_COMDAT (decl)
1960 || (TREE_CODE (decl) == FUNCTION_DECL
1961 && DECL_DECLARED_INLINE_P (decl))
1962 || (DECL_LANG_SPECIFIC (decl)
1963 && DECL_TEMPLATE_INSTANTIATION (decl))
1964 || (VAR_P (decl) && DECL_INLINE_VAR_P (decl)))
1966 else if (DECL_FUNCTION_SCOPE_P (decl))
1967 /* A local static in an inline effectively has vague linkage. */
1968 return (TREE_STATIC (decl)
1969 && vague_linkage_p (DECL_CONTEXT (decl)));
1974 /* Determine whether or not we want to specifically import or export CTYPE,
1975 using various heuristics. */
1978 import_export_class (tree ctype)
1980 /* -1 for imported, 1 for exported. */
1981 int import_export = 0;
1983 /* It only makes sense to call this function at EOF. The reason is
1984 that this function looks at whether or not the first non-inline
1985 non-abstract virtual member function has been defined in this
1986 translation unit. But, we can't possibly know that until we've
1987 seen the entire translation unit. */
1988 gcc_assert (at_eof);
1990 if (CLASSTYPE_INTERFACE_KNOWN (ctype))
1993 /* If MULTIPLE_SYMBOL_SPACES is set and we saw a #pragma interface,
1994 we will have CLASSTYPE_INTERFACE_ONLY set but not
1995 CLASSTYPE_INTERFACE_KNOWN. In that case, we don't want to use this
1996 heuristic because someone will supply a #pragma implementation
1997 elsewhere, and deducing it here would produce a conflict. */
1998 if (CLASSTYPE_INTERFACE_ONLY (ctype))
2001 if (lookup_attribute ("dllimport", TYPE_ATTRIBUTES (ctype)))
2003 else if (lookup_attribute ("dllexport", TYPE_ATTRIBUTES (ctype)))
2005 else if (CLASSTYPE_IMPLICIT_INSTANTIATION (ctype)
2006 && !flag_implicit_templates)
2007 /* For a template class, without -fimplicit-templates, check the
2008 repository. If the virtual table is assigned to this
2009 translation unit, then export the class; otherwise, import
2011 import_export = repo_export_class_p (ctype) ? 1 : -1;
2012 else if (TYPE_POLYMORPHIC_P (ctype))
2014 /* The ABI specifies that the virtual table and associated
2015 information are emitted with the key method, if any. */
2016 tree method = CLASSTYPE_KEY_METHOD (ctype);
2017 /* If weak symbol support is not available, then we must be
2018 careful not to emit the vtable when the key function is
2019 inline. An inline function can be defined in multiple
2020 translation units. If we were to emit the vtable in each
2021 translation unit containing a definition, we would get
2022 multiple definition errors at link-time. */
2023 if (method && (flag_weak || ! DECL_DECLARED_INLINE_P (method)))
2024 import_export = (DECL_REALLY_EXTERN (method) ? -1 : 1);
2027 /* When MULTIPLE_SYMBOL_SPACES is set, we cannot count on seeing
2028 a definition anywhere else. */
2029 if (MULTIPLE_SYMBOL_SPACES && import_export == -1)
2032 /* Allow back ends the chance to overrule the decision. */
2033 if (targetm.cxx.import_export_class)
2034 import_export = targetm.cxx.import_export_class (ctype, import_export);
2038 SET_CLASSTYPE_INTERFACE_KNOWN (ctype);
2039 CLASSTYPE_INTERFACE_ONLY (ctype) = (import_export < 0);
2043 /* Return true if VAR has already been provided to the back end; in that
2044 case VAR should not be modified further by the front end. */
2046 var_finalized_p (tree var)
2048 return varpool_node::get_create (var)->definition;
2051 /* DECL is a VAR_DECL or FUNCTION_DECL which, for whatever reason,
2052 must be emitted in this translation unit. Mark it as such. */
2055 mark_needed (tree decl)
2057 TREE_USED (decl) = 1;
2058 if (TREE_CODE (decl) == FUNCTION_DECL)
2060 /* Extern inline functions don't become needed when referenced.
2061 If we know a method will be emitted in other TU and no new
2062 functions can be marked reachable, just use the external
2064 struct cgraph_node *node = cgraph_node::get_create (decl);
2065 node->forced_by_abi = true;
2067 /* #pragma interface and -frepo code can call mark_needed for
2068 maybe-in-charge 'tors; mark the clones as well. */
2070 FOR_EACH_CLONE (clone, decl)
2071 mark_needed (clone);
2073 else if (VAR_P (decl))
2075 varpool_node *node = varpool_node::get_create (decl);
2076 /* C++ frontend use mark_decl_references to force COMDAT variables
2077 to be output that might appear dead otherwise. */
2078 node->forced_by_abi = true;
2082 /* DECL is either a FUNCTION_DECL or a VAR_DECL. This function
2083 returns true if a definition of this entity should be provided in
2084 this object file. Callers use this function to determine whether
2085 or not to let the back end know that a definition of DECL is
2086 available in this translation unit. */
2089 decl_needed_p (tree decl)
2091 gcc_assert (VAR_OR_FUNCTION_DECL_P (decl));
2092 /* This function should only be called at the end of the translation
2093 unit. We cannot be sure of whether or not something will be
2094 COMDAT until that point. */
2095 gcc_assert (at_eof);
2097 /* All entities with external linkage that are not COMDAT/EXTERN should be
2098 emitted; they may be referred to from other object files. */
2099 if (TREE_PUBLIC (decl) && !DECL_COMDAT (decl) && !DECL_REALLY_EXTERN (decl))
2101 /* Functions marked "dllexport" must be emitted so that they are
2102 visible to other DLLs. */
2103 if (flag_keep_inline_dllexport
2104 && lookup_attribute ("dllexport", DECL_ATTRIBUTES (decl)))
2107 /* When not optimizing, do not bother to produce definitions for extern
2109 if (DECL_REALLY_EXTERN (decl)
2110 && ((TREE_CODE (decl) != FUNCTION_DECL
2112 || (TREE_CODE (decl) == FUNCTION_DECL
2113 && !opt_for_fn (decl, optimize)))
2114 && !lookup_attribute ("always_inline", decl))
2117 /* If this entity was used, let the back end see it; it will decide
2118 whether or not to emit it into the object file. */
2119 if (TREE_USED (decl))
2122 /* Virtual functions might be needed for devirtualization. */
2123 if (flag_devirtualize
2124 && TREE_CODE (decl) == FUNCTION_DECL
2125 && DECL_VIRTUAL_P (decl))
2128 /* Otherwise, DECL does not need to be emitted -- yet. A subsequent
2129 reference to DECL might cause it to be emitted later. */
2133 /* If necessary, write out the vtables for the dynamic class CTYPE.
2134 Returns true if any vtables were emitted. */
2137 maybe_emit_vtables (tree ctype)
2142 varpool_node *current = NULL, *last = NULL;
2144 /* If the vtables for this class have already been emitted there is
2145 nothing more to do. */
2146 primary_vtbl = CLASSTYPE_VTABLES (ctype);
2147 if (var_finalized_p (primary_vtbl))
2149 /* Ignore dummy vtables made by get_vtable_decl. */
2150 if (TREE_TYPE (primary_vtbl) == void_type_node)
2153 /* On some targets, we cannot determine the key method until the end
2154 of the translation unit -- which is when this function is
2156 if (!targetm.cxx.key_method_may_be_inline ())
2157 determine_key_method (ctype);
2159 /* See if any of the vtables are needed. */
2160 for (vtbl = CLASSTYPE_VTABLES (ctype); vtbl; vtbl = DECL_CHAIN (vtbl))
2162 import_export_decl (vtbl);
2163 if (DECL_NOT_REALLY_EXTERN (vtbl) && decl_needed_p (vtbl))
2168 /* If the references to this class' vtables are optimized away,
2169 still emit the appropriate debugging information. See
2171 if (DECL_COMDAT (primary_vtbl)
2172 && CLASSTYPE_DEBUG_REQUESTED (ctype))
2173 note_debug_info_needed (ctype);
2177 /* The ABI requires that we emit all of the vtables if we emit any
2179 for (vtbl = CLASSTYPE_VTABLES (ctype); vtbl; vtbl = DECL_CHAIN (vtbl))
2181 /* Mark entities references from the virtual table as used. */
2182 mark_vtable_entries (vtbl);
2184 if (TREE_TYPE (DECL_INITIAL (vtbl)) == 0)
2186 vec<tree, va_gc> *cleanups = NULL;
2187 tree expr = store_init_value (vtbl, DECL_INITIAL (vtbl), &cleanups,
2190 /* It had better be all done at compile-time. */
2191 gcc_assert (!expr && !cleanups);
2195 DECL_EXTERNAL (vtbl) = 0;
2196 rest_of_decl_compilation (vtbl, 1, 1);
2198 /* Because we're only doing syntax-checking, we'll never end up
2199 actually marking the variable as written. */
2200 if (flag_syntax_only)
2201 TREE_ASM_WRITTEN (vtbl) = 1;
2202 else if (DECL_ONE_ONLY (vtbl))
2204 current = varpool_node::get_create (vtbl);
2206 current->add_to_same_comdat_group (last);
2211 /* Since we're writing out the vtable here, also write the debug
2213 note_debug_info_needed (ctype);
2218 /* A special return value from type_visibility meaning internal
2221 enum { VISIBILITY_ANON = VISIBILITY_INTERNAL+1 };
2223 /* walk_tree helper function for type_visibility. */
2226 min_vis_r (tree *tp, int *walk_subtrees, void *data)
2228 int *vis_p = (int *)data;
2233 else if (OVERLOAD_TYPE_P (*tp)
2234 && !TREE_PUBLIC (TYPE_MAIN_DECL (*tp)))
2236 *vis_p = VISIBILITY_ANON;
2239 else if (CLASS_TYPE_P (*tp)
2240 && CLASSTYPE_VISIBILITY (*tp) > *vis_p)
2241 *vis_p = CLASSTYPE_VISIBILITY (*tp);
2245 /* Returns the visibility of TYPE, which is the minimum visibility of its
2249 type_visibility (tree type)
2251 int vis = VISIBILITY_DEFAULT;
2252 cp_walk_tree_without_duplicates (&type, min_vis_r, &vis);
2256 /* Limit the visibility of DECL to VISIBILITY, if not explicitly
2257 specified (or if VISIBILITY is static). If TMPL is true, this
2258 constraint is for a template argument, and takes precedence
2259 over explicitly-specified visibility on the template. */
2262 constrain_visibility (tree decl, int visibility, bool tmpl)
2264 if (visibility == VISIBILITY_ANON)
2266 /* extern "C" declarations aren't affected by the anonymous
2268 if (!DECL_EXTERN_C_P (decl))
2270 TREE_PUBLIC (decl) = 0;
2271 DECL_WEAK (decl) = 0;
2272 DECL_COMMON (decl) = 0;
2273 DECL_COMDAT (decl) = false;
2274 if (VAR_OR_FUNCTION_DECL_P (decl))
2276 struct symtab_node *snode = symtab_node::get (decl);
2279 snode->set_comdat_group (NULL);
2281 DECL_INTERFACE_KNOWN (decl) = 1;
2282 if (DECL_LANG_SPECIFIC (decl))
2283 DECL_NOT_REALLY_EXTERN (decl) = 1;
2286 else if (visibility > DECL_VISIBILITY (decl)
2287 && (tmpl || !DECL_VISIBILITY_SPECIFIED (decl)))
2289 DECL_VISIBILITY (decl) = (enum symbol_visibility) visibility;
2290 /* This visibility was not specified. */
2291 DECL_VISIBILITY_SPECIFIED (decl) = false;
2295 /* Constrain the visibility of DECL based on the visibility of its template
2299 constrain_visibility_for_template (tree decl, tree targs)
2301 /* If this is a template instantiation, check the innermost
2302 template args for visibility constraints. The outer template
2303 args are covered by the class check. */
2304 tree args = INNERMOST_TEMPLATE_ARGS (targs);
2306 for (i = TREE_VEC_LENGTH (args); i > 0; --i)
2310 tree arg = TREE_VEC_ELT (args, i-1);
2312 vis = type_visibility (arg);
2315 if (REFERENCE_REF_P (arg))
2316 arg = TREE_OPERAND (arg, 0);
2317 if (TREE_TYPE (arg))
2319 if (TREE_CODE (arg) == ADDR_EXPR)
2320 arg = TREE_OPERAND (arg, 0);
2321 if (VAR_OR_FUNCTION_DECL_P (arg))
2323 if (! TREE_PUBLIC (arg))
2324 vis = VISIBILITY_ANON;
2326 vis = DECL_VISIBILITY (arg);
2330 constrain_visibility (decl, vis, true);
2334 /* Like c_determine_visibility, but with additional C++-specific
2337 Function-scope entities can rely on the function's visibility because
2338 it is set in start_preparsed_function.
2340 Class-scope entities cannot rely on the class's visibility until the end
2341 of the enclosing class definition.
2343 Note that because namespaces have multiple independent definitions,
2344 namespace visibility is handled elsewhere using the #pragma visibility
2345 machinery rather than by decorating the namespace declaration.
2347 The goal is for constraints from the type to give a diagnostic, and
2348 other constraints to be applied silently. */
2351 determine_visibility (tree decl)
2353 /* Remember that all decls get VISIBILITY_DEFAULT when built. */
2355 /* Only relevant for names with external linkage. */
2356 if (!TREE_PUBLIC (decl))
2359 /* Cloned constructors and destructors get the same visibility as
2360 the underlying function. That should be set up in
2361 maybe_clone_body. */
2362 gcc_assert (!DECL_CLONED_FUNCTION_P (decl));
2364 bool orig_visibility_specified = DECL_VISIBILITY_SPECIFIED (decl);
2365 enum symbol_visibility orig_visibility = DECL_VISIBILITY (decl);
2367 /* The decl may be a template instantiation, which could influence
2369 tree template_decl = NULL_TREE;
2370 if (TREE_CODE (decl) == TYPE_DECL)
2372 if (CLASS_TYPE_P (TREE_TYPE (decl)))
2374 if (CLASSTYPE_USE_TEMPLATE (TREE_TYPE (decl)))
2375 template_decl = decl;
2377 else if (TYPE_TEMPLATE_INFO (TREE_TYPE (decl)))
2378 template_decl = decl;
2380 else if (DECL_LANG_SPECIFIC (decl) && DECL_USE_TEMPLATE (decl))
2381 template_decl = decl;
2383 /* If DECL is a member of a class, visibility specifiers on the
2384 class can influence the visibility of the DECL. */
2385 tree class_type = NULL_TREE;
2386 if (DECL_CLASS_SCOPE_P (decl))
2387 class_type = DECL_CONTEXT (decl);
2390 /* Not a class member. */
2392 /* Virtual tables have DECL_CONTEXT set to their associated class,
2393 so they are automatically handled above. */
2394 gcc_assert (!VAR_P (decl)
2395 || !DECL_VTABLE_OR_VTT_P (decl));
2397 if (DECL_FUNCTION_SCOPE_P (decl) && ! DECL_VISIBILITY_SPECIFIED (decl))
2399 /* Local statics and classes get the visibility of their
2400 containing function by default, except that
2401 -fvisibility-inlines-hidden doesn't affect them. */
2402 tree fn = DECL_CONTEXT (decl);
2403 if (DECL_VISIBILITY_SPECIFIED (fn))
2405 DECL_VISIBILITY (decl) = DECL_VISIBILITY (fn);
2406 DECL_VISIBILITY_SPECIFIED (decl) =
2407 DECL_VISIBILITY_SPECIFIED (fn);
2411 if (DECL_CLASS_SCOPE_P (fn))
2412 determine_visibility_from_class (decl, DECL_CONTEXT (fn));
2413 else if (determine_hidden_inline (fn))
2415 DECL_VISIBILITY (decl) = default_visibility;
2416 DECL_VISIBILITY_SPECIFIED (decl) =
2417 visibility_options.inpragma;
2421 DECL_VISIBILITY (decl) = DECL_VISIBILITY (fn);
2422 DECL_VISIBILITY_SPECIFIED (decl) =
2423 DECL_VISIBILITY_SPECIFIED (fn);
2427 /* Local classes in templates have CLASSTYPE_USE_TEMPLATE set,
2428 but have no TEMPLATE_INFO, so don't try to check it. */
2429 template_decl = NULL_TREE;
2431 else if (VAR_P (decl) && DECL_TINFO_P (decl)
2432 && flag_visibility_ms_compat)
2434 /* Under -fvisibility-ms-compat, types are visible by default,
2435 even though their contents aren't. */
2436 tree underlying_type = TREE_TYPE (DECL_NAME (decl));
2437 int underlying_vis = type_visibility (underlying_type);
2438 if (underlying_vis == VISIBILITY_ANON
2439 || (CLASS_TYPE_P (underlying_type)
2440 && CLASSTYPE_VISIBILITY_SPECIFIED (underlying_type)))
2441 constrain_visibility (decl, underlying_vis, false);
2443 DECL_VISIBILITY (decl) = VISIBILITY_DEFAULT;
2445 else if (VAR_P (decl) && DECL_TINFO_P (decl))
2447 /* tinfo visibility is based on the type it's for. */
2448 constrain_visibility
2449 (decl, type_visibility (TREE_TYPE (DECL_NAME (decl))), false);
2451 /* Give the target a chance to override the visibility associated
2453 if (TREE_PUBLIC (decl)
2454 && !DECL_REALLY_EXTERN (decl)
2455 && CLASS_TYPE_P (TREE_TYPE (DECL_NAME (decl)))
2456 && !CLASSTYPE_VISIBILITY_SPECIFIED (TREE_TYPE (DECL_NAME (decl))))
2457 targetm.cxx.determine_class_data_visibility (decl);
2459 else if (template_decl)
2460 /* Template instantiations and specializations get visibility based
2461 on their template unless they override it with an attribute. */;
2462 else if (! DECL_VISIBILITY_SPECIFIED (decl))
2464 if (determine_hidden_inline (decl))
2465 DECL_VISIBILITY (decl) = VISIBILITY_HIDDEN;
2468 /* Set default visibility to whatever the user supplied with
2469 #pragma GCC visibility or a namespace visibility attribute. */
2470 DECL_VISIBILITY (decl) = default_visibility;
2471 DECL_VISIBILITY_SPECIFIED (decl) = visibility_options.inpragma;
2478 /* If the specialization doesn't specify visibility, use the
2479 visibility from the template. */
2480 tree tinfo = get_template_info (template_decl);
2481 tree args = TI_ARGS (tinfo);
2482 tree attribs = (TREE_CODE (decl) == TYPE_DECL
2483 ? TYPE_ATTRIBUTES (TREE_TYPE (decl))
2484 : DECL_ATTRIBUTES (decl));
2486 if (args != error_mark_node)
2488 tree pattern = DECL_TEMPLATE_RESULT (TI_TEMPLATE (tinfo));
2490 if (!DECL_VISIBILITY_SPECIFIED (decl))
2492 if (!DECL_VISIBILITY_SPECIFIED (pattern)
2493 && determine_hidden_inline (decl))
2494 DECL_VISIBILITY (decl) = VISIBILITY_HIDDEN;
2497 DECL_VISIBILITY (decl) = DECL_VISIBILITY (pattern);
2498 DECL_VISIBILITY_SPECIFIED (decl)
2499 = DECL_VISIBILITY_SPECIFIED (pattern);
2504 /* Template argument visibility outweighs #pragma or namespace
2505 visibility, but not an explicit attribute. */
2506 && !lookup_attribute ("visibility", attribs))
2508 int depth = TMPL_ARGS_DEPTH (args);
2509 if (DECL_VISIBILITY_SPECIFIED (decl))
2511 /* A class template member with explicit visibility
2512 overrides the class visibility, so we need to apply
2513 all the levels of template args directly. */
2515 for (i = 1; i <= depth; ++i)
2517 tree lev = TMPL_ARGS_LEVEL (args, i);
2518 constrain_visibility_for_template (decl, lev);
2521 else if (PRIMARY_TEMPLATE_P (TI_TEMPLATE (tinfo)))
2522 /* Limit visibility based on its template arguments. */
2523 constrain_visibility_for_template (decl, args);
2529 determine_visibility_from_class (decl, class_type);
2531 if (decl_anon_ns_mem_p (decl))
2532 /* Names in an anonymous namespace get internal linkage.
2533 This might change once we implement export. */
2534 constrain_visibility (decl, VISIBILITY_ANON, false);
2535 else if (TREE_CODE (decl) != TYPE_DECL)
2537 /* Propagate anonymity from type to decl. */
2538 int tvis = type_visibility (TREE_TYPE (decl));
2539 if (tvis == VISIBILITY_ANON
2540 || ! DECL_VISIBILITY_SPECIFIED (decl))
2541 constrain_visibility (decl, tvis, false);
2543 else if (no_linkage_check (TREE_TYPE (decl), /*relaxed_p=*/true))
2544 /* DR 757: A type without linkage shall not be used as the type of a
2545 variable or function with linkage, unless
2546 o the variable or function has extern "C" linkage (7.5 [dcl.link]), or
2547 o the variable or function is not used (3.2 [basic.def.odr]) or is
2548 defined in the same translation unit.
2550 Since non-extern "C" decls need to be defined in the same
2551 translation unit, we can make the type internal. */
2552 constrain_visibility (decl, VISIBILITY_ANON, false);
2554 /* If visibility changed and DECL already has DECL_RTL, ensure
2555 symbol flags are updated. */
2556 if ((DECL_VISIBILITY (decl) != orig_visibility
2557 || DECL_VISIBILITY_SPECIFIED (decl) != orig_visibility_specified)
2558 && ((VAR_P (decl) && TREE_STATIC (decl))
2559 || TREE_CODE (decl) == FUNCTION_DECL)
2560 && DECL_RTL_SET_P (decl))
2561 make_decl_rtl (decl);
2564 /* By default, static data members and function members receive
2565 the visibility of their containing class. */
2568 determine_visibility_from_class (tree decl, tree class_type)
2570 if (DECL_VISIBILITY_SPECIFIED (decl))
2573 if (determine_hidden_inline (decl))
2574 DECL_VISIBILITY (decl) = VISIBILITY_HIDDEN;
2577 /* Default to the class visibility. */
2578 DECL_VISIBILITY (decl) = CLASSTYPE_VISIBILITY (class_type);
2579 DECL_VISIBILITY_SPECIFIED (decl)
2580 = CLASSTYPE_VISIBILITY_SPECIFIED (class_type);
2583 /* Give the target a chance to override the visibility associated
2586 && (DECL_TINFO_P (decl)
2587 || (DECL_VTABLE_OR_VTT_P (decl)
2588 /* Construction virtual tables are not exported because
2589 they cannot be referred to from other object files;
2590 their name is not standardized by the ABI. */
2591 && !DECL_CONSTRUCTION_VTABLE_P (decl)))
2592 && TREE_PUBLIC (decl)
2593 && !DECL_REALLY_EXTERN (decl)
2594 && !CLASSTYPE_VISIBILITY_SPECIFIED (class_type))
2595 targetm.cxx.determine_class_data_visibility (decl);
2598 /* Returns true iff DECL is an inline that should get hidden visibility
2599 because of -fvisibility-inlines-hidden. */
2602 determine_hidden_inline (tree decl)
2604 return (visibility_options.inlines_hidden
2605 /* Don't do this for inline templates; specializations might not be
2606 inline, and we don't want them to inherit the hidden
2607 visibility. We'll set it here for all inline instantiations. */
2608 && !processing_template_decl
2609 && TREE_CODE (decl) == FUNCTION_DECL
2610 && DECL_DECLARED_INLINE_P (decl)
2611 && (! DECL_LANG_SPECIFIC (decl)
2612 || ! DECL_EXPLICIT_INSTANTIATION (decl)));
2615 /* Constrain the visibility of a class TYPE based on the visibility of its
2616 field types. Warn if any fields require lesser visibility. */
2619 constrain_class_visibility (tree type)
2625 int vis = type_visibility (type);
2627 if (vis == VISIBILITY_ANON
2628 || DECL_IN_SYSTEM_HEADER (TYPE_MAIN_DECL (type)))
2631 /* Don't warn about visibility if the class has explicit visibility. */
2632 if (CLASSTYPE_VISIBILITY_SPECIFIED (type))
2633 vis = VISIBILITY_INTERNAL;
2635 for (t = TYPE_FIELDS (type); t; t = DECL_CHAIN (t))
2636 if (TREE_CODE (t) == FIELD_DECL && TREE_TYPE (t) != error_mark_node
2637 && !DECL_ARTIFICIAL (t))
2639 tree ftype = strip_pointer_or_array_types (TREE_TYPE (t));
2640 int subvis = type_visibility (ftype);
2642 if (subvis == VISIBILITY_ANON)
2644 if (!in_main_input_context())
2646 tree nlt = no_linkage_check (ftype, /*relaxed_p=*/false);
2649 if (same_type_p (TREE_TYPE (t), nlt))
2650 warning (OPT_Wsubobject_linkage, "\
2651 %qT has a field %qD whose type has no linkage",
2654 warning (OPT_Wsubobject_linkage, "\
2655 %qT has a field %qD whose type depends on the type %qT which has no linkage",
2659 warning (OPT_Wsubobject_linkage, "\
2660 %qT has a field %qD whose type uses the anonymous namespace",
2664 else if (MAYBE_CLASS_TYPE_P (ftype)
2665 && vis < VISIBILITY_HIDDEN
2666 && subvis >= VISIBILITY_HIDDEN)
2667 warning (OPT_Wattributes, "\
2668 %qT declared with greater visibility than the type of its field %qD",
2672 binfo = TYPE_BINFO (type);
2673 for (i = 0; BINFO_BASE_ITERATE (binfo, i, t); ++i)
2675 int subvis = type_visibility (TREE_TYPE (t));
2677 if (subvis == VISIBILITY_ANON)
2679 if (!in_main_input_context())
2681 tree nlt = no_linkage_check (TREE_TYPE (t), /*relaxed_p=*/false);
2684 if (same_type_p (TREE_TYPE (t), nlt))
2685 warning (OPT_Wsubobject_linkage, "\
2686 %qT has a base %qT whose type has no linkage",
2687 type, TREE_TYPE (t));
2689 warning (OPT_Wsubobject_linkage, "\
2690 %qT has a base %qT whose type depends on the type %qT which has no linkage",
2691 type, TREE_TYPE (t), nlt);
2694 warning (OPT_Wsubobject_linkage, "\
2695 %qT has a base %qT whose type uses the anonymous namespace",
2696 type, TREE_TYPE (t));
2699 else if (vis < VISIBILITY_HIDDEN
2700 && subvis >= VISIBILITY_HIDDEN)
2701 warning (OPT_Wattributes, "\
2702 %qT declared with greater visibility than its base %qT",
2703 type, TREE_TYPE (t));
2707 /* Functions for adjusting the visibility of a tagged type and its nested
2708 types and declarations when it gets a name for linkage purposes from a
2711 static void bt_reset_linkage_1 (binding_entry, void *);
2712 static void bt_reset_linkage_2 (binding_entry, void *);
2714 /* First reset the visibility of all the types. */
2717 reset_type_linkage_1 (tree type)
2719 set_linkage_according_to_type (type, TYPE_MAIN_DECL (type));
2720 if (CLASS_TYPE_P (type))
2721 binding_table_foreach (CLASSTYPE_NESTED_UTDS (type),
2722 bt_reset_linkage_1, NULL);
2725 bt_reset_linkage_1 (binding_entry b, void */*data*/)
2727 reset_type_linkage_1 (b->type);
2730 /* Then reset the visibility of any static data members or member
2731 functions that use those types. */
2734 reset_decl_linkage (tree decl)
2736 if (TREE_PUBLIC (decl))
2738 if (DECL_CLONED_FUNCTION_P (decl))
2740 TREE_PUBLIC (decl) = true;
2741 DECL_INTERFACE_KNOWN (decl) = false;
2742 determine_visibility (decl);
2743 tentative_decl_linkage (decl);
2747 reset_type_linkage_2 (tree type)
2749 if (CLASS_TYPE_P (type))
2751 if (tree vt = CLASSTYPE_VTABLES (type))
2753 tree name = mangle_vtbl_for_type (type);
2754 DECL_NAME (vt) = name;
2755 SET_DECL_ASSEMBLER_NAME (vt, name);
2756 reset_decl_linkage (vt);
2758 if (tree ti = CLASSTYPE_TYPEINFO_VAR (type))
2760 tree name = mangle_typeinfo_for_type (type);
2761 DECL_NAME (ti) = name;
2762 SET_DECL_ASSEMBLER_NAME (ti, name);
2763 TREE_TYPE (name) = type;
2764 reset_decl_linkage (ti);
2766 for (tree m = TYPE_FIELDS (type); m; m = DECL_CHAIN (m))
2768 tree mem = STRIP_TEMPLATE (m);
2769 if (TREE_CODE (mem) == VAR_DECL || TREE_CODE (mem) == FUNCTION_DECL)
2770 reset_decl_linkage (mem);
2772 binding_table_foreach (CLASSTYPE_NESTED_UTDS (type),
2773 bt_reset_linkage_2, NULL);
2778 bt_reset_linkage_2 (binding_entry b, void */*data*/)
2780 reset_type_linkage_2 (b->type);
2783 reset_type_linkage (tree type)
2785 reset_type_linkage_1 (type);
2786 reset_type_linkage_2 (type);
2789 /* Set up our initial idea of what the linkage of DECL should be. */
2792 tentative_decl_linkage (tree decl)
2794 if (DECL_INTERFACE_KNOWN (decl))
2795 /* We've already made a decision as to how this function will
2797 else if (vague_linkage_p (decl))
2799 if (TREE_CODE (decl) == FUNCTION_DECL
2800 && decl_defined_p (decl))
2802 DECL_EXTERNAL (decl) = 1;
2803 DECL_NOT_REALLY_EXTERN (decl) = 1;
2804 note_vague_linkage_fn (decl);
2805 /* A non-template inline function with external linkage will
2806 always be COMDAT. As we must eventually determine the
2807 linkage of all functions, and as that causes writes to
2808 the data mapped in from the PCH file, it's advantageous
2809 to mark the functions at this point. */
2810 if (DECL_DECLARED_INLINE_P (decl)
2811 && (!DECL_IMPLICIT_INSTANTIATION (decl)
2812 || DECL_DEFAULTED_FN (decl)))
2814 /* This function must have external linkage, as
2815 otherwise DECL_INTERFACE_KNOWN would have been
2817 gcc_assert (TREE_PUBLIC (decl));
2818 comdat_linkage (decl);
2819 DECL_INTERFACE_KNOWN (decl) = 1;
2822 else if (VAR_P (decl))
2823 maybe_commonize_var (decl);
2827 /* DECL is a FUNCTION_DECL or VAR_DECL. If the object file linkage
2828 for DECL has not already been determined, do so now by setting
2829 DECL_EXTERNAL, DECL_COMDAT and other related flags. Until this
2830 function is called entities with vague linkage whose definitions
2831 are available must have TREE_PUBLIC set.
2833 If this function decides to place DECL in COMDAT, it will set
2834 appropriate flags -- but will not clear DECL_EXTERNAL. It is up to
2835 the caller to decide whether or not to clear DECL_EXTERNAL. Some
2836 callers defer that decision until it is clear that DECL is actually
2840 import_export_decl (tree decl)
2845 tree class_type = NULL_TREE;
2847 if (DECL_INTERFACE_KNOWN (decl))
2850 /* We cannot determine what linkage to give to an entity with vague
2851 linkage until the end of the file. For example, a virtual table
2852 for a class will be defined if and only if the key method is
2853 defined in this translation unit. As a further example, consider
2854 that when compiling a translation unit that uses PCH file with
2855 "-frepo" it would be incorrect to make decisions about what
2856 entities to emit when building the PCH; those decisions must be
2857 delayed until the repository information has been processed. */
2858 gcc_assert (at_eof);
2859 /* Object file linkage for explicit instantiations is handled in
2860 mark_decl_instantiated. For static variables in functions with
2861 vague linkage, maybe_commonize_var is used.
2863 Therefore, the only declarations that should be provided to this
2864 function are those with external linkage that are:
2866 * implicit instantiations of function templates
2870 * implicit instantiations of static data members of class
2877 Furthermore, all entities that reach this point must have a
2878 definition available in this translation unit.
2880 The following assertions check these conditions. */
2881 gcc_assert (VAR_OR_FUNCTION_DECL_P (decl));
2882 /* Any code that creates entities with TREE_PUBLIC cleared should
2883 also set DECL_INTERFACE_KNOWN. */
2884 gcc_assert (TREE_PUBLIC (decl));
2885 if (TREE_CODE (decl) == FUNCTION_DECL)
2886 gcc_assert (DECL_IMPLICIT_INSTANTIATION (decl)
2887 || DECL_FRIEND_PSEUDO_TEMPLATE_INSTANTIATION (decl)
2888 || DECL_DECLARED_INLINE_P (decl));
2890 gcc_assert (DECL_IMPLICIT_INSTANTIATION (decl)
2891 || DECL_VTABLE_OR_VTT_P (decl)
2892 || DECL_TINFO_P (decl));
2893 /* Check that a definition of DECL is available in this translation
2895 gcc_assert (!DECL_REALLY_EXTERN (decl));
2897 /* Assume that DECL will not have COMDAT linkage. */
2899 /* Assume that DECL will not be imported into this translation
2903 /* See if the repository tells us whether or not to emit DECL in
2904 this translation unit. */
2905 emit_p = repo_emit_p (decl);
2908 else if (emit_p == 1)
2910 /* The repository indicates that this entity should be defined
2911 here. Make sure the back end honors that request. */
2913 /* Output the definition as an ordinary strong definition. */
2914 DECL_EXTERNAL (decl) = 0;
2915 DECL_INTERFACE_KNOWN (decl) = 1;
2920 /* We have already decided what to do with this DECL; there is no
2921 need to check anything further. */
2923 else if (VAR_P (decl) && DECL_VTABLE_OR_VTT_P (decl))
2925 class_type = DECL_CONTEXT (decl);
2926 import_export_class (class_type);
2927 if (CLASSTYPE_INTERFACE_KNOWN (class_type)
2928 && CLASSTYPE_INTERFACE_ONLY (class_type))
2930 else if ((!flag_weak || TARGET_WEAK_NOT_IN_ARCHIVE_TOC)
2931 && !CLASSTYPE_USE_TEMPLATE (class_type)
2932 && CLASSTYPE_KEY_METHOD (class_type)
2933 && !DECL_DECLARED_INLINE_P (CLASSTYPE_KEY_METHOD (class_type)))
2934 /* The ABI requires that all virtual tables be emitted with
2935 COMDAT linkage. However, on systems where COMDAT symbols
2936 don't show up in the table of contents for a static
2937 archive, or on systems without weak symbols (where we
2938 approximate COMDAT linkage by using internal linkage), the
2939 linker will report errors about undefined symbols because
2940 it will not see the virtual table definition. Therefore,
2941 in the case that we know that the virtual table will be
2942 emitted in only one translation unit, we make the virtual
2943 table an ordinary definition with external linkage. */
2944 DECL_EXTERNAL (decl) = 0;
2945 else if (CLASSTYPE_INTERFACE_KNOWN (class_type))
2947 /* CLASS_TYPE is being exported from this translation unit,
2948 so DECL should be defined here. */
2949 if (!flag_weak && CLASSTYPE_EXPLICIT_INSTANTIATION (class_type))
2950 /* If a class is declared in a header with the "extern
2951 template" extension, then it will not be instantiated,
2952 even in translation units that would normally require
2953 it. Often such classes are explicitly instantiated in
2954 one translation unit. Therefore, the explicit
2955 instantiation must be made visible to other translation
2957 DECL_EXTERNAL (decl) = 0;
2960 /* The generic C++ ABI says that class data is always
2961 COMDAT, even if there is a key function. Some
2962 variants (e.g., the ARM EABI) says that class data
2963 only has COMDAT linkage if the class data might be
2964 emitted in more than one translation unit. When the
2965 key method can be inline and is inline, we still have
2966 to arrange for comdat even though
2967 class_data_always_comdat is false. */
2968 if (!CLASSTYPE_KEY_METHOD (class_type)
2969 || DECL_DECLARED_INLINE_P (CLASSTYPE_KEY_METHOD (class_type))
2970 || targetm.cxx.class_data_always_comdat ())
2972 /* The ABI requires COMDAT linkage. Normally, we
2973 only emit COMDAT things when they are needed;
2974 make sure that we realize that this entity is
2981 else if (!flag_implicit_templates
2982 && CLASSTYPE_IMPLICIT_INSTANTIATION (class_type))
2987 else if (VAR_P (decl) && DECL_TINFO_P (decl))
2989 tree type = TREE_TYPE (DECL_NAME (decl));
2990 if (CLASS_TYPE_P (type))
2993 import_export_class (type);
2994 if (CLASSTYPE_INTERFACE_KNOWN (type)
2995 && TYPE_POLYMORPHIC_P (type)
2996 && CLASSTYPE_INTERFACE_ONLY (type)
2997 /* If -fno-rtti was specified, then we cannot be sure
2998 that RTTI information will be emitted with the
2999 virtual table of the class, so we must emit it
3000 wherever it is used. */
3005 if (CLASSTYPE_INTERFACE_KNOWN (type)
3006 && !CLASSTYPE_INTERFACE_ONLY (type))
3008 comdat_p = (targetm.cxx.class_data_always_comdat ()
3009 || (CLASSTYPE_KEY_METHOD (type)
3010 && DECL_DECLARED_INLINE_P (CLASSTYPE_KEY_METHOD (type))));
3015 DECL_EXTERNAL (decl) = 0;
3025 else if (DECL_TEMPLOID_INSTANTIATION (decl))
3027 /* DECL is an implicit instantiation of a function or static
3029 if ((flag_implicit_templates
3030 && !flag_use_repository)
3031 || (flag_implicit_inline_templates
3032 && TREE_CODE (decl) == FUNCTION_DECL
3033 && DECL_DECLARED_INLINE_P (decl)))
3036 /* If we are not implicitly generating templates, then mark
3037 this entity as undefined in this translation unit. */
3040 else if (DECL_FUNCTION_MEMBER_P (decl))
3042 if (!DECL_DECLARED_INLINE_P (decl))
3044 tree ctype = DECL_CONTEXT (decl);
3045 import_export_class (ctype);
3046 if (CLASSTYPE_INTERFACE_KNOWN (ctype))
3048 DECL_NOT_REALLY_EXTERN (decl)
3049 = ! (CLASSTYPE_INTERFACE_ONLY (ctype)
3050 || (DECL_DECLARED_INLINE_P (decl)
3051 && ! flag_implement_inlines
3052 && !DECL_VINDEX (decl)));
3054 if (!DECL_NOT_REALLY_EXTERN (decl))
3055 DECL_EXTERNAL (decl) = 1;
3057 /* Always make artificials weak. */
3058 if (DECL_ARTIFICIAL (decl) && flag_weak)
3061 maybe_make_one_only (decl);
3072 /* If we are importing DECL into this translation unit, mark is
3073 an undefined here. */
3074 DECL_EXTERNAL (decl) = 1;
3075 DECL_NOT_REALLY_EXTERN (decl) = 0;
3079 /* If we decided to put DECL in COMDAT, mark it accordingly at
3081 comdat_linkage (decl);
3084 DECL_INTERFACE_KNOWN (decl) = 1;
3087 /* Return an expression that performs the destruction of DECL, which
3088 must be a VAR_DECL whose type has a non-trivial destructor, or is
3089 an array whose (innermost) elements have a non-trivial destructor. */
3092 build_cleanup (tree decl)
3094 tree clean = cxx_maybe_build_cleanup (decl, tf_warning_or_error);
3095 gcc_assert (clean != NULL_TREE);
3099 /* Returns the initialization guard variable for the variable DECL,
3100 which has static storage duration. */
3103 get_guard (tree decl)
3108 sname = mangle_guard_variable (decl);
3109 guard = get_global_binding (sname);
3114 /* We use a type that is big enough to contain a mutex as well
3115 as an integer counter. */
3116 guard_type = targetm.cxx.guard_type ();
3117 guard = build_decl (DECL_SOURCE_LOCATION (decl),
3118 VAR_DECL, sname, guard_type);
3120 /* The guard should have the same linkage as what it guards. */
3121 TREE_PUBLIC (guard) = TREE_PUBLIC (decl);
3122 TREE_STATIC (guard) = TREE_STATIC (decl);
3123 DECL_COMMON (guard) = DECL_COMMON (decl);
3124 DECL_COMDAT (guard) = DECL_COMDAT (decl);
3125 CP_DECL_THREAD_LOCAL_P (guard) = CP_DECL_THREAD_LOCAL_P (decl);
3126 set_decl_tls_model (guard, DECL_TLS_MODEL (decl));
3127 if (DECL_ONE_ONLY (decl))
3128 make_decl_one_only (guard, cxx_comdat_group (guard));
3129 if (TREE_PUBLIC (decl))
3130 DECL_WEAK (guard) = DECL_WEAK (decl);
3131 DECL_VISIBILITY (guard) = DECL_VISIBILITY (decl);
3132 DECL_VISIBILITY_SPECIFIED (guard) = DECL_VISIBILITY_SPECIFIED (decl);
3134 DECL_ARTIFICIAL (guard) = 1;
3135 DECL_IGNORED_P (guard) = 1;
3136 TREE_USED (guard) = 1;
3137 pushdecl_top_level_and_finish (guard, NULL_TREE);
3142 /* Return an atomic load of src with the appropriate memory model. */
3145 build_atomic_load_byte (tree src, HOST_WIDE_INT model)
3147 tree ptr_type = build_pointer_type (char_type_node);
3148 tree mem_model = build_int_cst (integer_type_node, model);
3153 size = tree_to_uhwi (TYPE_SIZE_UNIT (char_type_node));
3155 fncode = BUILT_IN_ATOMIC_LOAD_N + exact_log2 (size) + 1;
3156 t = builtin_decl_implicit ((enum built_in_function) fncode);
3158 addr = build1 (ADDR_EXPR, ptr_type, src);
3159 val = build_call_expr (t, 2, addr, mem_model);
3163 /* Return those bits of the GUARD variable that should be set when the
3164 guarded entity is actually initialized. */
3167 get_guard_bits (tree guard)
3169 if (!targetm.cxx.guard_mask_bit ())
3171 /* We only set the first byte of the guard, in order to leave room
3172 for a mutex in the high-order bits. */
3173 guard = build1 (ADDR_EXPR,
3174 build_pointer_type (TREE_TYPE (guard)),
3176 guard = build1 (NOP_EXPR,
3177 build_pointer_type (char_type_node),
3179 guard = build1 (INDIRECT_REF, char_type_node, guard);
3185 /* Return an expression which determines whether or not the GUARD
3186 variable has already been initialized. */
3189 get_guard_cond (tree guard, bool thread_safe)
3194 guard = get_guard_bits (guard);
3196 guard = build_atomic_load_byte (guard, MEMMODEL_ACQUIRE);
3198 /* Mask off all but the low bit. */
3199 if (targetm.cxx.guard_mask_bit ())
3201 guard_value = integer_one_node;
3202 if (!same_type_p (TREE_TYPE (guard_value), TREE_TYPE (guard)))
3203 guard_value = fold_convert (TREE_TYPE (guard), guard_value);
3204 guard = cp_build_binary_op (input_location,
3205 BIT_AND_EXPR, guard, guard_value,
3206 tf_warning_or_error);
3209 guard_value = integer_zero_node;
3210 if (!same_type_p (TREE_TYPE (guard_value), TREE_TYPE (guard)))
3211 guard_value = fold_convert (TREE_TYPE (guard), guard_value);
3212 return cp_build_binary_op (input_location,
3213 EQ_EXPR, guard, guard_value,
3214 tf_warning_or_error);
3217 /* Return an expression which sets the GUARD variable, indicating that
3218 the variable being guarded has been initialized. */
3221 set_guard (tree guard)
3225 /* Set the GUARD to one. */
3226 guard = get_guard_bits (guard);
3227 guard_init = integer_one_node;
3228 if (!same_type_p (TREE_TYPE (guard_init), TREE_TYPE (guard)))
3229 guard_init = fold_convert (TREE_TYPE (guard), guard_init);
3230 return cp_build_modify_expr (input_location, guard, NOP_EXPR, guard_init,
3231 tf_warning_or_error);
3234 /* Returns true iff we can tell that VAR does not have a dynamic
3238 var_defined_without_dynamic_init (tree var)
3240 /* If it's defined in another TU, we can't tell. */
3241 if (DECL_EXTERNAL (var))
3243 /* If it has a non-trivial destructor, registering the destructor
3244 counts as dynamic initialization. */
3245 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (TREE_TYPE (var)))
3247 /* If it's in this TU, its initializer has been processed, unless
3248 it's a case of self-initialization, then DECL_INITIALIZED_P is
3249 false while the initializer is handled by finish_id_expression. */
3250 if (!DECL_INITIALIZED_P (var))
3252 /* If it has no initializer or a constant one, it's not dynamic. */
3253 return (!DECL_NONTRIVIALLY_INITIALIZED_P (var)
3254 || DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (var));
3257 /* Returns true iff VAR is a variable that needs uses to be
3258 wrapped for possible dynamic initialization. */
3261 var_needs_tls_wrapper (tree var)
3263 return (!error_operand_p (var)
3264 && CP_DECL_THREAD_LOCAL_P (var)
3265 && !DECL_GNU_TLS_P (var)
3266 && !DECL_FUNCTION_SCOPE_P (var)
3267 && !var_defined_without_dynamic_init (var));
3270 /* Get the FUNCTION_DECL for the shared TLS init function for this
3271 translation unit. */
3274 get_local_tls_init_fn (void)
3276 tree sname = get_identifier ("__tls_init");
3277 tree fn = get_global_binding (sname);
3280 fn = build_lang_decl (FUNCTION_DECL, sname,
3281 build_function_type (void_type_node,
3283 SET_DECL_LANGUAGE (fn, lang_c);
3284 TREE_PUBLIC (fn) = false;
3285 DECL_ARTIFICIAL (fn) = true;
3287 set_global_binding (fn);
3292 /* Get a FUNCTION_DECL for the init function for the thread_local
3293 variable VAR. The init function will be an alias to the function
3294 that initializes all the non-local TLS variables in the translation
3295 unit. The init function is only used by the wrapper function. */
3298 get_tls_init_fn (tree var)
3300 /* Only C++11 TLS vars need this init fn. */
3301 if (!var_needs_tls_wrapper (var))
3304 /* If -fno-extern-tls-init, assume that we don't need to call
3305 a tls init function for a variable defined in another TU. */
3306 if (!flag_extern_tls_init && DECL_EXTERNAL (var))
3309 /* If the variable is internal, or if we can't generate aliases,
3310 call the local init function directly. */
3311 if (!TREE_PUBLIC (var) || !TARGET_SUPPORTS_ALIASES)
3312 return get_local_tls_init_fn ();
3314 tree sname = mangle_tls_init_fn (var);
3315 tree fn = get_global_binding (sname);
3318 fn = build_lang_decl (FUNCTION_DECL, sname,
3319 build_function_type (void_type_node,
3321 SET_DECL_LANGUAGE (fn, lang_c);
3322 TREE_PUBLIC (fn) = TREE_PUBLIC (var);
3323 DECL_ARTIFICIAL (fn) = true;
3324 DECL_COMDAT (fn) = DECL_COMDAT (var);
3325 DECL_EXTERNAL (fn) = DECL_EXTERNAL (var);
3326 if (DECL_ONE_ONLY (var))
3327 make_decl_one_only (fn, cxx_comdat_group (fn));
3328 if (TREE_PUBLIC (var))
3330 tree obtype = strip_array_types (non_reference (TREE_TYPE (var)));
3331 /* If the variable is defined somewhere else and might have static
3332 initialization, make the init function a weak reference. */
3333 if ((!TYPE_NEEDS_CONSTRUCTING (obtype)
3334 || TYPE_HAS_CONSTEXPR_CTOR (obtype)
3335 || TYPE_HAS_TRIVIAL_DFLT (obtype))
3336 && TYPE_HAS_TRIVIAL_DESTRUCTOR (obtype)
3337 && DECL_EXTERNAL (var))
3340 DECL_WEAK (fn) = DECL_WEAK (var);
3342 DECL_VISIBILITY (fn) = DECL_VISIBILITY (var);
3343 DECL_VISIBILITY_SPECIFIED (fn) = DECL_VISIBILITY_SPECIFIED (var);
3344 DECL_DLLIMPORT_P (fn) = DECL_DLLIMPORT_P (var);
3345 DECL_IGNORED_P (fn) = 1;
3348 DECL_BEFRIENDING_CLASSES (fn) = var;
3350 set_global_binding (fn);
3355 /* Get a FUNCTION_DECL for the init wrapper function for the thread_local
3356 variable VAR. The wrapper function calls the init function (if any) for
3357 VAR and then returns a reference to VAR. The wrapper function is used
3358 in place of VAR everywhere VAR is mentioned. */
3361 get_tls_wrapper_fn (tree var)
3363 /* Only C++11 TLS vars need this wrapper fn. */
3364 if (!var_needs_tls_wrapper (var))
3367 tree sname = mangle_tls_wrapper_fn (var);
3368 tree fn = get_global_binding (sname);
3371 /* A named rvalue reference is an lvalue, so the wrapper should
3372 always return an lvalue reference. */
3373 tree type = non_reference (TREE_TYPE (var));
3374 type = build_reference_type (type);
3375 tree fntype = build_function_type (type, void_list_node);
3376 fn = build_lang_decl (FUNCTION_DECL, sname, fntype);
3377 SET_DECL_LANGUAGE (fn, lang_c);
3378 TREE_PUBLIC (fn) = TREE_PUBLIC (var);
3379 DECL_ARTIFICIAL (fn) = true;
3380 DECL_IGNORED_P (fn) = 1;
3381 /* The wrapper is inline and emitted everywhere var is used. */
3382 DECL_DECLARED_INLINE_P (fn) = true;
3383 if (TREE_PUBLIC (var))
3385 comdat_linkage (fn);
3386 #ifdef HAVE_GAS_HIDDEN
3387 /* Make the wrapper bind locally; there's no reason to share
3388 the wrapper between multiple shared objects. */
3389 DECL_VISIBILITY (fn) = VISIBILITY_INTERNAL;
3390 DECL_VISIBILITY_SPECIFIED (fn) = true;
3393 if (!TREE_PUBLIC (fn))
3394 DECL_INTERFACE_KNOWN (fn) = true;
3396 note_vague_linkage_fn (fn);
3399 /* We want CSE to commonize calls to the wrapper, but marking it as
3400 pure is unsafe since it has side-effects. I guess we need a new
3401 ECF flag even weaker than ECF_PURE. FIXME! */
3402 DECL_PURE_P (fn) = true;
3405 DECL_BEFRIENDING_CLASSES (fn) = var;
3407 set_global_binding (fn);
3412 /* At EOF, generate the definition for the TLS wrapper function FN:
3415 if (init_fn) init_fn();
3420 generate_tls_wrapper (tree fn)
3422 tree var = DECL_BEFRIENDING_CLASSES (fn);
3424 start_preparsed_function (fn, NULL_TREE, SF_DEFAULT | SF_PRE_PARSED);
3425 tree body = begin_function_body ();
3426 /* Only call the init fn if there might be one. */
3427 if (tree init_fn = get_tls_init_fn (var))
3429 tree if_stmt = NULL_TREE;
3430 /* If init_fn is a weakref, make sure it exists before calling. */
3431 if (lookup_attribute ("weak", DECL_ATTRIBUTES (init_fn)))
3433 if_stmt = begin_if_stmt ();
3434 tree addr = cp_build_addr_expr (init_fn, tf_warning_or_error);
3435 tree cond = cp_build_binary_op (DECL_SOURCE_LOCATION (var),
3436 NE_EXPR, addr, nullptr_node,
3437 tf_warning_or_error);
3438 finish_if_stmt_cond (cond, if_stmt);
3440 finish_expr_stmt (build_cxx_call
3441 (init_fn, 0, NULL, tf_warning_or_error));
3444 finish_then_clause (if_stmt);
3445 finish_if_stmt (if_stmt);
3449 /* If there's no initialization, the wrapper is a constant function. */
3450 TREE_READONLY (fn) = true;
3451 finish_return_stmt (convert_from_reference (var));
3452 finish_function_body (body);
3453 expand_or_defer_fn (finish_function (/*inline_p=*/false));
3456 /* Start the process of running a particular set of global constructors
3457 or destructors. Subroutine of do_[cd]tors. Also called from
3458 vtv_start_verification_constructor_init_function. */
3461 start_objects (int method_type, int initp)
3467 /* Make ctor or dtor function. METHOD_TYPE may be 'I' or 'D'. */
3469 if (initp != DEFAULT_INIT_PRIORITY)
3479 sprintf (type, "sub_%c%c%.5u", method_type, joiner, initp);
3482 sprintf (type, "sub_%c", method_type);
3484 fndecl = build_lang_decl (FUNCTION_DECL,
3485 get_file_function_name (type),
3486 build_function_type_list (void_type_node,
3488 start_preparsed_function (fndecl, /*attrs=*/NULL_TREE, SF_PRE_PARSED);
3490 TREE_PUBLIC (current_function_decl) = 0;
3492 /* Mark as artificial because it's not explicitly in the user's
3494 DECL_ARTIFICIAL (current_function_decl) = 1;
3496 /* Mark this declaration as used to avoid spurious warnings. */
3497 TREE_USED (current_function_decl) = 1;
3499 /* Mark this function as a global constructor or destructor. */
3500 if (method_type == 'I')
3501 DECL_GLOBAL_CTOR_P (current_function_decl) = 1;
3503 DECL_GLOBAL_DTOR_P (current_function_decl) = 1;
3505 body = begin_compound_stmt (BCS_FN_BODY);
3510 /* Finish the process of running a particular set of global constructors
3511 or destructors. Subroutine of do_[cd]tors. */
3514 finish_objects (int method_type, int initp, tree body)
3519 finish_compound_stmt (body);
3520 fn = finish_function (/*inline_p=*/false);
3522 if (method_type == 'I')
3524 DECL_STATIC_CONSTRUCTOR (fn) = 1;
3525 decl_init_priority_insert (fn, initp);
3529 DECL_STATIC_DESTRUCTOR (fn) = 1;
3530 decl_fini_priority_insert (fn, initp);
3533 expand_or_defer_fn (fn);
3536 /* The names of the parameters to the function created to handle
3537 initializations and destructions for objects with static storage
3539 #define INITIALIZE_P_IDENTIFIER "__initialize_p"
3540 #define PRIORITY_IDENTIFIER "__priority"
3542 /* The name of the function we create to handle initializations and
3543 destructions for objects with static storage duration. */
3544 #define SSDF_IDENTIFIER "__static_initialization_and_destruction"
3546 /* The declaration for the __INITIALIZE_P argument. */
3547 static GTY(()) tree initialize_p_decl;
3549 /* The declaration for the __PRIORITY argument. */
3550 static GTY(()) tree priority_decl;
3552 /* The declaration for the static storage duration function. */
3553 static GTY(()) tree ssdf_decl;
3555 /* All the static storage duration functions created in this
3556 translation unit. */
3557 static GTY(()) vec<tree, va_gc> *ssdf_decls;
3559 /* A map from priority levels to information about that priority
3560 level. There may be many such levels, so efficient lookup is
3562 static splay_tree priority_info_map;
3564 /* Begins the generation of the function that will handle all
3565 initialization and destruction of objects with static storage
3566 duration. The function generated takes two parameters of type
3567 `int': __INITIALIZE_P and __PRIORITY. If __INITIALIZE_P is
3568 nonzero, it performs initializations. Otherwise, it performs
3569 destructions. It only performs those initializations or
3570 destructions with the indicated __PRIORITY. The generated function
3573 It is assumed that this function will only be called once per
3574 translation unit. */
3577 start_static_storage_duration_function (unsigned count)
3581 char id[sizeof (SSDF_IDENTIFIER) + 1 /* '\0' */ + 32];
3583 /* Create the identifier for this function. It will be of the form
3584 SSDF_IDENTIFIER_<number>. */
3585 sprintf (id, "%s_%u", SSDF_IDENTIFIER, count);
3587 type = build_function_type_list (void_type_node,
3588 integer_type_node, integer_type_node,
3591 /* Create the FUNCTION_DECL itself. */
3592 ssdf_decl = build_lang_decl (FUNCTION_DECL,
3593 get_identifier (id),
3595 TREE_PUBLIC (ssdf_decl) = 0;
3596 DECL_ARTIFICIAL (ssdf_decl) = 1;
3598 /* Put this function in the list of functions to be called from the
3599 static constructors and destructors. */
3602 vec_alloc (ssdf_decls, 32);
3604 /* Take this opportunity to initialize the map from priority
3605 numbers to information about that priority level. */
3606 priority_info_map = splay_tree_new (splay_tree_compare_ints,
3607 /*delete_key_fn=*/0,
3608 /*delete_value_fn=*/
3609 (splay_tree_delete_value_fn)
3610 (void (*) (void)) free);
3612 /* We always need to generate functions for the
3613 DEFAULT_INIT_PRIORITY so enter it now. That way when we walk
3614 priorities later, we'll be sure to find the
3615 DEFAULT_INIT_PRIORITY. */
3616 get_priority_info (DEFAULT_INIT_PRIORITY);
3619 vec_safe_push (ssdf_decls, ssdf_decl);
3621 /* Create the argument list. */
3622 initialize_p_decl = cp_build_parm_decl
3623 (ssdf_decl, get_identifier (INITIALIZE_P_IDENTIFIER), integer_type_node);
3624 TREE_USED (initialize_p_decl) = 1;
3625 priority_decl = cp_build_parm_decl
3626 (ssdf_decl, get_identifier (PRIORITY_IDENTIFIER), integer_type_node);
3627 TREE_USED (priority_decl) = 1;
3629 DECL_CHAIN (initialize_p_decl) = priority_decl;
3630 DECL_ARGUMENTS (ssdf_decl) = initialize_p_decl;
3632 /* Put the function in the global scope. */
3633 pushdecl (ssdf_decl);
3635 /* Start the function itself. This is equivalent to declaring the
3638 static void __ssdf (int __initialize_p, init __priority_p);
3640 It is static because we only need to call this function from the
3641 various constructor and destructor functions for this module. */
3642 start_preparsed_function (ssdf_decl,
3643 /*attrs=*/NULL_TREE,
3646 /* Set up the scope of the outermost block in the function. */
3647 body = begin_compound_stmt (BCS_FN_BODY);
3652 /* Finish the generation of the function which performs initialization
3653 and destruction of objects with static storage duration. After
3654 this point, no more such objects can be created. */
3657 finish_static_storage_duration_function (tree body)
3659 /* Close out the function. */
3660 finish_compound_stmt (body);
3661 expand_or_defer_fn (finish_function (/*inline_p=*/false));
3664 /* Return the information about the indicated PRIORITY level. If no
3665 code to handle this level has yet been generated, generate the
3666 appropriate prologue. */
3668 static priority_info
3669 get_priority_info (int priority)
3674 n = splay_tree_lookup (priority_info_map,
3675 (splay_tree_key) priority);
3678 /* Create a new priority information structure, and insert it
3680 pi = XNEW (struct priority_info_s);
3681 pi->initializations_p = 0;
3682 pi->destructions_p = 0;
3683 splay_tree_insert (priority_info_map,
3684 (splay_tree_key) priority,
3685 (splay_tree_value) pi);
3688 pi = (priority_info) n->value;
3693 /* The effective initialization priority of a DECL. */
3695 #define DECL_EFFECTIVE_INIT_PRIORITY(decl) \
3696 ((!DECL_HAS_INIT_PRIORITY_P (decl) || DECL_INIT_PRIORITY (decl) == 0) \
3697 ? DEFAULT_INIT_PRIORITY : DECL_INIT_PRIORITY (decl))
3699 /* Whether a DECL needs a guard to protect it against multiple
3702 #define NEEDS_GUARD_P(decl) (TREE_PUBLIC (decl) && (DECL_COMMON (decl) \
3703 || DECL_ONE_ONLY (decl) \
3704 || DECL_WEAK (decl)))
3706 /* Called from one_static_initialization_or_destruction(),
3708 Walks the initializer list of a global variable and looks for
3709 temporary variables (DECL_NAME() == NULL and DECL_ARTIFICIAL != 0)
3710 and that have their DECL_CONTEXT() == NULL.
3711 For each such temporary variable, set their DECL_CONTEXT() to
3712 the current function. This is necessary because otherwise
3713 some optimizers (enabled by -O2 -fprofile-arcs) might crash
3714 when trying to refer to a temporary variable that does not have
3715 it's DECL_CONTECT() properly set. */
3717 fix_temporary_vars_context_r (tree *node,
3721 gcc_assert (current_function_decl);
3723 if (TREE_CODE (*node) == BIND_EXPR)
3727 for (var = BIND_EXPR_VARS (*node); var; var = DECL_CHAIN (var))
3730 && DECL_ARTIFICIAL (var)
3731 && !DECL_CONTEXT (var))
3732 DECL_CONTEXT (var) = current_function_decl;
3738 /* Set up to handle the initialization or destruction of DECL. If
3739 INITP is nonzero, we are initializing the variable. Otherwise, we
3740 are destroying it. */
3743 one_static_initialization_or_destruction (tree decl, tree init, bool initp)
3745 tree guard_if_stmt = NULL_TREE;
3748 /* If we are supposed to destruct and there's a trivial destructor,
3749 nothing has to be done. */
3751 && TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
3754 /* Trick the compiler into thinking we are at the file and line
3755 where DECL was declared so that error-messages make sense, and so
3756 that the debugger will show somewhat sensible file and line
3758 input_location = DECL_SOURCE_LOCATION (decl);
3760 /* Make sure temporary variables in the initialiser all have
3761 their DECL_CONTEXT() set to a value different from NULL_TREE.
3762 This can happen when global variables initializers are built.
3763 In that case, the DECL_CONTEXT() of the global variables _AND_ of all
3764 the temporary variables that might have been generated in the
3765 accompanying initializers is NULL_TREE, meaning the variables have been
3766 declared in the global namespace.
3767 What we want to do here is to fix that and make sure the DECL_CONTEXT()
3768 of the temporaries are set to the current function decl. */
3769 cp_walk_tree_without_duplicates (&init,
3770 fix_temporary_vars_context_r,
3777 Access control for implicit calls to the constructors,
3778 the conversion functions, or the destructor called to
3779 create and destroy a static data member is performed as
3780 if these calls appeared in the scope of the member's
3783 we pretend we are in a static member function of the class of
3784 which the DECL is a member. */
3785 if (member_p (decl))
3787 DECL_CONTEXT (current_function_decl) = DECL_CONTEXT (decl);
3788 DECL_STATIC_FUNCTION_P (current_function_decl) = 1;
3791 /* Assume we don't need a guard. */
3793 /* We need a guard if this is an object with external linkage that
3794 might be initialized in more than one place. (For example, a
3795 static data member of a template, when the data member requires
3797 if (NEEDS_GUARD_P (decl))
3801 guard = get_guard (decl);
3803 /* When using __cxa_atexit, we just check the GUARD as we would
3804 for a local static. */
3805 if (flag_use_cxa_atexit)
3807 /* When using __cxa_atexit, we never try to destroy
3808 anything from a static destructor. */
3810 guard_cond = get_guard_cond (guard, false);
3812 /* If we don't have __cxa_atexit, then we will be running
3813 destructors from .fini sections, or their equivalents. So,
3814 we need to know how many times we've tried to initialize this
3815 object. We do initializations only if the GUARD is zero,
3816 i.e., if we are the first to initialize the variable. We do
3817 destructions only if the GUARD is one, i.e., if we are the
3818 last to destroy the variable. */
3821 = cp_build_binary_op (input_location,
3823 cp_build_unary_op (PREINCREMENT_EXPR,
3826 tf_warning_or_error),
3828 tf_warning_or_error);
3831 = cp_build_binary_op (input_location,
3833 cp_build_unary_op (PREDECREMENT_EXPR,
3836 tf_warning_or_error),
3838 tf_warning_or_error);
3840 guard_if_stmt = begin_if_stmt ();
3841 finish_if_stmt_cond (guard_cond, guard_if_stmt);
3845 /* If we're using __cxa_atexit, we have not already set the GUARD,
3846 so we must do so now. */
3847 if (guard && initp && flag_use_cxa_atexit)
3848 finish_expr_stmt (set_guard (guard));
3850 /* Perform the initialization or destruction. */
3855 finish_expr_stmt (init);
3856 if (sanitize_flags_p (SANITIZE_ADDRESS, decl))
3858 varpool_node *vnode = varpool_node::get (decl);
3860 vnode->dynamically_initialized = 1;
3864 /* If we're using __cxa_atexit, register a function that calls the
3865 destructor for the object. */
3866 if (flag_use_cxa_atexit)
3867 finish_expr_stmt (register_dtor_fn (decl));
3870 finish_expr_stmt (build_cleanup (decl));
3872 /* Finish the guard if-stmt, if necessary. */
3875 finish_then_clause (guard_if_stmt);
3876 finish_if_stmt (guard_if_stmt);
3879 /* Now that we're done with DECL we don't need to pretend to be a
3880 member of its class any longer. */
3881 DECL_CONTEXT (current_function_decl) = NULL_TREE;
3882 DECL_STATIC_FUNCTION_P (current_function_decl) = 0;
3885 /* Generate code to do the initialization or destruction of the decls in VARS,
3886 a TREE_LIST of VAR_DECL with static storage duration.
3887 Whether initialization or destruction is performed is specified by INITP. */
3890 do_static_initialization_or_destruction (tree vars, bool initp)
3892 tree node, init_if_stmt, cond;
3894 /* Build the outer if-stmt to check for initialization or destruction. */
3895 init_if_stmt = begin_if_stmt ();
3896 cond = initp ? integer_one_node : integer_zero_node;
3897 cond = cp_build_binary_op (input_location,
3901 tf_warning_or_error);
3902 finish_if_stmt_cond (cond, init_if_stmt);
3904 /* To make sure dynamic construction doesn't access globals from other
3905 compilation units where they might not be yet constructed, for
3906 -fsanitize=address insert __asan_before_dynamic_init call that
3907 prevents access to either all global variables that need construction
3908 in other compilation units, or at least those that haven't been
3909 initialized yet. Variables that need dynamic construction in
3910 the current compilation unit are kept accessible. */
3911 if (initp && (flag_sanitize & SANITIZE_ADDRESS))
3912 finish_expr_stmt (asan_dynamic_init_call (/*after_p=*/false));
3916 tree decl = TREE_VALUE (node);
3917 tree priority_if_stmt;
3921 /* If we don't need a destructor, there's nothing to do. Avoid
3922 creating a possibly empty if-stmt. */
3923 if (!initp && TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
3925 node = TREE_CHAIN (node);
3929 /* Remember that we had an initialization or finalization at this
3931 priority = DECL_EFFECTIVE_INIT_PRIORITY (decl);
3932 pi = get_priority_info (priority);
3934 pi->initializations_p = 1;
3936 pi->destructions_p = 1;
3938 /* Conditionalize this initialization on being in the right priority
3939 and being initializing/finalizing appropriately. */
3940 priority_if_stmt = begin_if_stmt ();
3941 cond = cp_build_binary_op (input_location,
3944 build_int_cst (NULL_TREE, priority),
3945 tf_warning_or_error);
3946 finish_if_stmt_cond (cond, priority_if_stmt);
3948 /* Process initializers with same priority. */
3950 && DECL_EFFECTIVE_INIT_PRIORITY (TREE_VALUE (node)) == priority;
3951 node = TREE_CHAIN (node))
3952 /* Do one initialization or destruction. */
3953 one_static_initialization_or_destruction (TREE_VALUE (node),
3954 TREE_PURPOSE (node), initp);
3956 /* Finish up the priority if-stmt body. */
3957 finish_then_clause (priority_if_stmt);
3958 finish_if_stmt (priority_if_stmt);
3962 /* Revert what __asan_before_dynamic_init did by calling
3963 __asan_after_dynamic_init. */
3964 if (initp && (flag_sanitize & SANITIZE_ADDRESS))
3965 finish_expr_stmt (asan_dynamic_init_call (/*after_p=*/true));
3967 /* Finish up the init/destruct if-stmt body. */
3968 finish_then_clause (init_if_stmt);
3969 finish_if_stmt (init_if_stmt);
3972 /* VARS is a list of variables with static storage duration which may
3973 need initialization and/or finalization. Remove those variables
3974 that don't really need to be initialized or finalized, and return
3975 the resulting list. The order in which the variables appear in
3976 VARS is in reverse order of the order in which they should actually
3977 be initialized. The list we return is in the unreversed order;
3978 i.e., the first variable should be initialized first. */
3981 prune_vars_needing_no_initialization (tree *vars)
3984 tree result = NULL_TREE;
3989 tree decl = TREE_VALUE (t);
3990 tree init = TREE_PURPOSE (t);
3992 /* Deal gracefully with error. */
3993 if (error_operand_p (decl))
3995 var = &TREE_CHAIN (t);
3999 /* The only things that can be initialized are variables. */
4000 gcc_assert (VAR_P (decl));
4002 /* If this object is not defined, we don't need to do anything
4004 if (DECL_EXTERNAL (decl))
4006 var = &TREE_CHAIN (t);
4010 /* Also, if the initializer already contains errors, we can bail
4012 if (init && TREE_CODE (init) == TREE_LIST
4013 && value_member (error_mark_node, init))
4015 var = &TREE_CHAIN (t);
4019 /* This variable is going to need initialization and/or
4020 finalization, so we add it to the list. */
4021 *var = TREE_CHAIN (t);
4022 TREE_CHAIN (t) = result;
4029 /* Make sure we have told the back end about all the variables in
4033 write_out_vars (tree vars)
4037 for (v = vars; v; v = TREE_CHAIN (v))
4039 tree var = TREE_VALUE (v);
4040 if (!var_finalized_p (var))
4042 import_export_decl (var);
4043 rest_of_decl_compilation (var, 1, 1);
4048 /* Generate a static constructor (if CONSTRUCTOR_P) or destructor
4049 (otherwise) that will initialize all global objects with static
4050 storage duration having the indicated PRIORITY. */
4053 generate_ctor_or_dtor_function (bool constructor_p, int priority,
4061 input_location = *locus;
4063 /* Was: locus->line++; */
4065 /* We use `I' to indicate initialization and `D' to indicate
4067 function_key = constructor_p ? 'I' : 'D';
4069 /* We emit the function lazily, to avoid generating empty
4070 global constructors and destructors. */
4073 /* For Objective-C++, we may need to initialize metadata found in this module.
4074 This must be done _before_ any other static initializations. */
4075 if (c_dialect_objc () && (priority == DEFAULT_INIT_PRIORITY)
4076 && constructor_p && objc_static_init_needed_p ())
4078 body = start_objects (function_key, priority);
4079 objc_generate_static_init_call (NULL_TREE);
4082 /* Call the static storage duration function with appropriate
4084 FOR_EACH_VEC_SAFE_ELT (ssdf_decls, i, fndecl)
4086 /* Calls to pure or const functions will expand to nothing. */
4087 if (! (flags_from_decl_or_type (fndecl) & (ECF_CONST | ECF_PURE)))
4092 body = start_objects (function_key, priority);
4094 call = cp_build_function_call_nary (fndecl, tf_warning_or_error,
4095 build_int_cst (NULL_TREE,
4097 build_int_cst (NULL_TREE,
4100 finish_expr_stmt (call);
4104 /* Close out the function. */
4106 finish_objects (function_key, priority, body);
4109 /* Generate constructor and destructor functions for the priority
4113 generate_ctor_and_dtor_functions_for_priority (splay_tree_node n, void * data)
4115 location_t *locus = (location_t *) data;
4116 int priority = (int) n->key;
4117 priority_info pi = (priority_info) n->value;
4119 /* Generate the functions themselves, but only if they are really
4121 if (pi->initializations_p)
4122 generate_ctor_or_dtor_function (/*constructor_p=*/true, priority, locus);
4123 if (pi->destructions_p)
4124 generate_ctor_or_dtor_function (/*constructor_p=*/false, priority, locus);
4126 /* Keep iterating. */
4130 /* Return C++ property of T, based on given operation OP. */
4133 cpp_check (tree t, cpp_operation op)
4137 case HAS_DEPENDENT_TEMPLATE_ARGS:
4139 tree ti = CLASSTYPE_TEMPLATE_INFO (t);
4142 ++processing_template_decl;
4143 const bool dep = any_dependent_template_arguments_p (TI_ARGS (ti));
4144 --processing_template_decl;
4148 return DECL_PURE_VIRTUAL_P (t);
4149 case IS_CONSTRUCTOR:
4150 return DECL_CONSTRUCTOR_P (t);
4152 return DECL_DESTRUCTOR_P (t);
4153 case IS_COPY_CONSTRUCTOR:
4154 return DECL_COPY_CONSTRUCTOR_P (t);
4155 case IS_MOVE_CONSTRUCTOR:
4156 return DECL_MOVE_CONSTRUCTOR_P (t);
4158 return TREE_CODE (t) == TEMPLATE_DECL;
4160 return trivial_type_p (t);
4166 /* Collect source file references recursively, starting from NAMESPC. */
4169 collect_source_refs (tree namespc)
4171 /* Iterate over names in this name space. */
4172 for (tree t = NAMESPACE_LEVEL (namespc)->names; t; t = TREE_CHAIN (t))
4173 if (DECL_IS_BUILTIN (t))
4175 else if (TREE_CODE (t) == NAMESPACE_DECL && !DECL_NAMESPACE_ALIAS (t))
4176 collect_source_refs (t);
4178 collect_source_ref (DECL_SOURCE_FILE (t));
4181 /* Collect decls relevant to SOURCE_FILE from all namespaces recursively,
4182 starting from NAMESPC. */
4185 collect_ada_namespace (tree namespc, const char *source_file)
4187 tree decl = NAMESPACE_LEVEL (namespc)->names;
4189 /* Collect decls from this namespace. This will skip
4190 NAMESPACE_DECLs (both aliases and regular, it cannot tell). */
4191 collect_ada_nodes (decl, source_file);
4193 /* Now scan for namespace children, and dump them. */
4194 for (; decl; decl = TREE_CHAIN (decl))
4195 if (TREE_CODE (decl) == NAMESPACE_DECL && !DECL_NAMESPACE_ALIAS (decl))
4196 collect_ada_namespace (decl, source_file);
4199 /* Returns true iff there is a definition available for variable or
4203 decl_defined_p (tree decl)
4205 if (TREE_CODE (decl) == FUNCTION_DECL)
4206 return (DECL_INITIAL (decl) != NULL_TREE
4207 /* A pending instantiation of a friend temploid is defined. */
4208 || (DECL_FRIEND_PSEUDO_TEMPLATE_INSTANTIATION (decl)
4209 && DECL_INITIAL (DECL_TEMPLATE_RESULT
4210 (DECL_TI_TEMPLATE (decl)))));
4213 gcc_assert (VAR_P (decl));
4214 return !DECL_EXTERNAL (decl);
4218 /* Nonzero for a VAR_DECL whose value can be used in a constant expression.
4222 An integral constant-expression can only involve ... const
4223 variables of integral or enumeration types initialized with
4224 constant expressions ...
4226 C++0x also allows constexpr variables and temporaries initialized
4227 with constant expressions. We handle the former here, but the latter
4228 are just folded away in cxx_eval_constant_expression.
4230 The standard does not require that the expression be non-volatile.
4231 G++ implements the proposed correction in DR 457. */
4234 decl_constant_var_p (tree decl)
4236 if (!decl_maybe_constant_var_p (decl))
4239 /* We don't know if a template static data member is initialized with
4240 a constant expression until we instantiate its initializer. Even
4241 in the case of a constexpr variable, we can't treat it as a
4242 constant until its initializer is complete in case it's used in
4243 its own initializer. */
4244 maybe_instantiate_decl (decl);
4245 return DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl);
4248 /* Returns true if DECL could be a symbolic constant variable, depending on
4252 decl_maybe_constant_var_p (tree decl)
4254 tree type = TREE_TYPE (decl);
4257 if (DECL_DECLARED_CONSTEXPR_P (decl))
4259 if (DECL_HAS_VALUE_EXPR_P (decl))
4260 /* A proxy isn't constant. */
4262 if (TREE_CODE (type) == REFERENCE_TYPE)
4263 /* References can be constant. */;
4264 else if (CP_TYPE_CONST_NON_VOLATILE_P (type)
4265 && INTEGRAL_OR_ENUMERATION_TYPE_P (type))
4266 /* And const integers. */;
4270 if (DECL_INITIAL (decl)
4271 && !DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl))
4272 /* We know the initializer, and it isn't constant. */
4278 /* Complain that DECL uses a type with no linkage. In C++98 mode this is
4279 called from grokfndecl and grokvardecl; in all modes it is called from
4280 cp_write_global_declarations. */
4283 no_linkage_error (tree decl)
4285 if (cxx_dialect >= cxx11 && decl_defined_p (decl))
4286 /* In C++11 it's ok if the decl is defined. */
4288 tree t = no_linkage_check (TREE_TYPE (decl), /*relaxed_p=*/false);
4290 /* The type that got us on no_linkage_decls must have gotten a name for
4291 linkage purposes. */;
4292 else if (CLASS_TYPE_P (t) && TYPE_BEING_DEFINED (t))
4293 /* The type might end up having a typedef name for linkage purposes. */
4294 vec_safe_push (no_linkage_decls, decl);
4295 else if (TYPE_UNNAMED_P (t))
4298 if (cxx_dialect >= cxx11)
4299 d = permerror (DECL_SOURCE_LOCATION (decl), "%q#D, declared using "
4300 "unnamed type, is used but never defined", decl);
4301 else if (DECL_EXTERN_C_P (decl))
4302 /* Allow this; it's pretty common in C. */;
4303 else if (VAR_P (decl))
4304 /* DRs 132, 319 and 389 seem to indicate types with
4305 no linkage can only be used to declare extern "C"
4306 entities. Since it's not always an error in the
4307 ISO C++ 90 Standard, we only issue a warning. */
4308 d = warning_at (DECL_SOURCE_LOCATION (decl), 0, "unnamed type "
4309 "with no linkage used to declare variable %q#D with "
4312 d = permerror (DECL_SOURCE_LOCATION (decl), "unnamed type with no "
4313 "linkage used to declare function %q#D with linkage",
4315 if (d && is_typedef_decl (TYPE_NAME (t)))
4316 inform (DECL_SOURCE_LOCATION (TYPE_NAME (t)), "%q#D does not refer "
4317 "to the unqualified type, so it is not used for linkage",
4320 else if (cxx_dialect >= cxx11)
4322 if (VAR_P (decl) || !DECL_PURE_VIRTUAL_P (decl))
4323 permerror (DECL_SOURCE_LOCATION (decl),
4324 "%q#D, declared using local type "
4325 "%qT, is used but never defined", decl, t);
4327 else if (VAR_P (decl))
4328 warning_at (DECL_SOURCE_LOCATION (decl), 0, "type %qT with no linkage "
4329 "used to declare variable %q#D with linkage", t, decl);
4331 permerror (DECL_SOURCE_LOCATION (decl), "type %qT with no linkage used "
4332 "to declare function %q#D with linkage", t, decl);
4335 /* Collect declarations from all namespaces relevant to SOURCE_FILE. */
4338 collect_all_refs (const char *source_file)
4340 collect_ada_namespace (global_namespace, source_file);
4343 /* Clear DECL_EXTERNAL for NODE. */
4346 clear_decl_external (struct cgraph_node *node, void * /*data*/)
4348 DECL_EXTERNAL (node->decl) = 0;
4352 /* Build up the function to run dynamic initializers for thread_local
4353 variables in this translation unit and alias the init functions for the
4354 individual variables to it. */
4357 handle_tls_init (void)
4359 tree vars = prune_vars_needing_no_initialization (&tls_aggregates);
4360 if (vars == NULL_TREE)
4363 location_t loc = DECL_SOURCE_LOCATION (TREE_VALUE (vars));
4365 write_out_vars (vars);
4367 tree guard = build_decl (loc, VAR_DECL, get_identifier ("__tls_guard"),
4369 TREE_PUBLIC (guard) = false;
4370 TREE_STATIC (guard) = true;
4371 DECL_ARTIFICIAL (guard) = true;
4372 DECL_IGNORED_P (guard) = true;
4373 TREE_USED (guard) = true;
4374 CP_DECL_THREAD_LOCAL_P (guard) = true;
4375 set_decl_tls_model (guard, decl_default_tls_model (guard));
4376 pushdecl_top_level_and_finish (guard, NULL_TREE);
4378 tree fn = get_local_tls_init_fn ();
4379 start_preparsed_function (fn, NULL_TREE, SF_PRE_PARSED);
4380 tree body = begin_function_body ();
4381 tree if_stmt = begin_if_stmt ();
4382 tree cond = cp_build_unary_op (TRUTH_NOT_EXPR, guard, false,
4383 tf_warning_or_error);
4384 finish_if_stmt_cond (cond, if_stmt);
4385 finish_expr_stmt (cp_build_modify_expr (loc, guard, NOP_EXPR,
4387 tf_warning_or_error));
4388 for (; vars; vars = TREE_CHAIN (vars))
4390 tree var = TREE_VALUE (vars);
4391 tree init = TREE_PURPOSE (vars);
4392 one_static_initialization_or_destruction (var, init, true);
4394 /* Output init aliases even with -fno-extern-tls-init. */
4395 if (TARGET_SUPPORTS_ALIASES && TREE_PUBLIC (var))
4397 tree single_init_fn = get_tls_init_fn (var);
4398 if (single_init_fn == NULL_TREE)
4401 = cgraph_node::get_create (fn)->create_same_body_alias
4402 (single_init_fn, fn);
4403 gcc_assert (alias != NULL);
4407 finish_then_clause (if_stmt);
4408 finish_if_stmt (if_stmt);
4409 finish_function_body (body);
4410 expand_or_defer_fn (finish_function (/*inline_p=*/false));
4413 /* We're at the end of compilation, so generate any mangling aliases that
4414 we've been saving up, if DECL is going to be output and ID2 isn't
4415 already taken by another declaration. */
4418 generate_mangling_alias (tree decl, tree id2)
4420 struct cgraph_node *n = NULL;
4422 if (TREE_CODE (decl) == FUNCTION_DECL)
4424 n = cgraph_node::get (decl);
4426 /* Don't create an alias to an unreferenced function. */
4431 = mangled_decls->find_slot_with_hash (id2, IDENTIFIER_HASH_VALUE (id2),
4434 /* If there's a declaration already using this mangled name,
4435 don't create a compatibility alias that conflicts. */
4439 tree alias = make_alias_for (decl, id2);
4442 DECL_IGNORED_P (alias) = 1;
4443 TREE_PUBLIC (alias) = TREE_PUBLIC (decl);
4444 DECL_VISIBILITY (alias) = DECL_VISIBILITY (decl);
4445 if (vague_linkage_p (decl))
4446 DECL_WEAK (alias) = 1;
4449 n->create_same_body_alias (alias, decl);
4451 varpool_node::create_extra_name_alias (alias, decl);
4454 /* Note that we might want to emit an alias with the symbol ID2 for DECL at
4455 the end of translation, for compatibility across bugs in the mangling
4459 note_mangling_alias (tree decl, tree id2)
4461 if (TARGET_SUPPORTS_ALIASES)
4463 if (!defer_mangling_aliases)
4464 generate_mangling_alias (decl, id2);
4467 vec_safe_push (mangling_aliases, decl);
4468 vec_safe_push (mangling_aliases, id2);
4473 /* Emit all mangling aliases that were deferred up to this point. */
4476 generate_mangling_aliases ()
4478 while (!vec_safe_is_empty (mangling_aliases))
4480 tree id2 = mangling_aliases->pop();
4481 tree decl = mangling_aliases->pop();
4482 generate_mangling_alias (decl, id2);
4484 defer_mangling_aliases = false;
4487 /* Record a mangling of DECL, whose DECL_ASSEMBLER_NAME has just been
4488 set. NEED_WARNING is true if we must warn about collisions. We do
4489 this to spot changes in mangling that may require compatibility
4493 record_mangling (tree decl, bool need_warning)
4496 mangled_decls = hash_table<mangled_decl_hash>::create_ggc (499);
4498 gcc_checking_assert (DECL_ASSEMBLER_NAME_SET_P (decl));
4499 tree id = DECL_ASSEMBLER_NAME_RAW (decl);
4501 = mangled_decls->find_slot_with_hash (id, IDENTIFIER_HASH_VALUE (id),
4504 /* If this is already an alias, remove the alias, because the real
4505 decl takes precedence. */
4506 if (*slot && DECL_ARTIFICIAL (*slot) && DECL_IGNORED_P (*slot))
4507 if (symtab_node *n = symtab_node::get (*slot))
4508 if (n->cpp_implicit_alias)
4516 else if (need_warning)
4518 error_at (DECL_SOURCE_LOCATION (decl),
4519 "mangling of %q#D as %qE conflicts with a previous mangle",
4521 inform (DECL_SOURCE_LOCATION (*slot),
4522 "previous mangling %q#D", *slot);
4523 inform (DECL_SOURCE_LOCATION (decl),
4524 "a later -fabi-version= (or =0)"
4525 " avoids this error with a change in mangling");
4530 /* The mangled name of DECL is being forcibly changed to NAME. Remove
4531 any existing knowledge of DECL's mangled name meaning DECL. */
4534 overwrite_mangling (tree decl, tree name)
4536 if (tree id = DECL_ASSEMBLER_NAME_RAW (decl))
4537 if ((TREE_CODE (decl) == VAR_DECL
4538 || TREE_CODE (decl) == FUNCTION_DECL)
4541 = mangled_decls->find_slot_with_hash (id, IDENTIFIER_HASH_VALUE (id),
4545 mangled_decls->clear_slot (slot);
4547 /* If this is an alias, remove it from the symbol table. */
4548 if (DECL_ARTIFICIAL (decl) && DECL_IGNORED_P (decl))
4549 if (symtab_node *n = symtab_node::get (decl))
4550 if (n->cpp_implicit_alias)
4554 DECL_ASSEMBLER_NAME_RAW (decl) = name;
4557 /* The entire file is now complete. If requested, dump everything
4564 if (FILE *stream = dump_begin (raw_dump_id, &flags))
4566 dump_node (global_namespace, flags & ~TDF_SLIM, stream);
4567 dump_end (raw_dump_id, stream);
4571 static location_t locus_at_end_of_parsing;
4573 /* Check the deallocation functions for CODE to see if we want to warn that
4574 only one was defined. */
4577 maybe_warn_sized_delete (enum tree_code code)
4579 tree sized = NULL_TREE;
4580 tree unsized = NULL_TREE;
4582 for (ovl_iterator iter (get_global_binding (ovl_op_identifier (false, code)));
4586 /* We're only interested in usual deallocation functions. */
4587 if (!usual_deallocation_fn_p (fn))
4589 if (FUNCTION_ARG_CHAIN (fn) == void_list_node)
4594 if (DECL_INITIAL (unsized) && !DECL_INITIAL (sized))
4595 warning_at (DECL_SOURCE_LOCATION (unsized), OPT_Wsized_deallocation,
4596 "the program should also define %qD", sized);
4597 else if (!DECL_INITIAL (unsized) && DECL_INITIAL (sized))
4598 warning_at (DECL_SOURCE_LOCATION (sized), OPT_Wsized_deallocation,
4599 "the program should also define %qD", unsized);
4602 /* Check the global deallocation functions to see if we want to warn about
4603 defining unsized without sized (or vice versa). */
4606 maybe_warn_sized_delete ()
4608 if (!flag_sized_deallocation || !warn_sized_deallocation)
4610 maybe_warn_sized_delete (DELETE_EXPR);
4611 maybe_warn_sized_delete (VEC_DELETE_EXPR);
4614 /* Earlier we left PTRMEM_CST in variable initializers alone so that we could
4615 look them up when evaluating non-type template parameters. Now we need to
4616 lower them to something the back end can understand. */
4622 FOR_EACH_VARIABLE (node)
4624 tree d = node->decl;
4625 if (tree init = DECL_INITIAL (d))
4626 DECL_INITIAL (d) = cplus_expand_constant (init);
4630 /* This routine is called at the end of compilation.
4631 Its job is to create all the code needed to initialize and
4632 destroy the global aggregates. We do the destruction
4633 first, since that way we only need to reverse the decls once. */
4636 c_parse_final_cleanups (void)
4641 unsigned ssdf_count = 0;
4645 locus_at_end_of_parsing = input_location;
4648 /* Bad parse errors. Just forget about it. */
4649 if (! global_bindings_p () || current_class_type
4650 || !vec_safe_is_empty (decl_namespace_list))
4653 /* This is the point to write out a PCH if we're doing that.
4654 In that case we do not want to do anything else. */
4657 /* Mangle all symbols at PCH creation time. */
4659 FOR_EACH_SYMBOL (node)
4660 if (! is_a <varpool_node *> (node)
4661 || ! DECL_HARD_REGISTER (node->decl))
4662 DECL_ASSEMBLER_NAME (node->decl);
4663 c_common_write_pch ();
4665 /* Ensure even the callers don't try to finalize the CU. */
4666 flag_syntax_only = 1;
4670 timevar_stop (TV_PHASE_PARSING);
4671 timevar_start (TV_PHASE_DEFERRED);
4673 symtab->process_same_body_aliases ();
4675 /* Handle -fdump-ada-spec[-slim] */
4676 if (flag_dump_ada_spec || flag_dump_ada_spec_slim)
4678 if (flag_dump_ada_spec_slim)
4679 collect_source_ref (main_input_filename);
4681 collect_source_refs (global_namespace);
4683 dump_ada_specs (collect_all_refs, cpp_check);
4686 /* FIXME - huh? was input_line -= 1;*/
4688 /* We now have to write out all the stuff we put off writing out.
4691 o Template specializations that we have not yet instantiated,
4692 but which are needed.
4693 o Initialization and destruction for non-local objects with
4694 static storage duration. (Local objects with static storage
4695 duration are initialized when their scope is first entered,
4696 and are cleaned up via atexit.)
4697 o Virtual function tables.
4699 All of these may cause others to be needed. For example,
4700 instantiating one function may cause another to be needed, and
4701 generating the initializer for an object may cause templates to be
4702 instantiated, etc., etc. */
4704 emit_support_tinfos ();
4713 /* If there are templates that we've put off instantiating, do
4715 instantiate_pending_templates (retries);
4718 /* Write out virtual tables as required. Writing out the
4719 virtual table for a template class may cause the
4720 instantiation of members of that class. If we write out
4721 vtables then we remove the class from our list so we don't
4722 have to look at it again. */
4723 for (i = keyed_classes->length ();
4724 keyed_classes->iterate (--i, &t);)
4725 if (maybe_emit_vtables (t))
4728 keyed_classes->unordered_remove (i);
4730 /* The input_location may have been changed during marking of
4732 input_location = locus_at_end_of_parsing;
4734 /* Write out needed type info variables. We have to be careful
4735 looping through unemitted decls, because emit_tinfo_decl may
4736 cause other variables to be needed. New elements will be
4737 appended, and we remove from the vector those that actually
4739 for (i = unemitted_tinfo_decls->length ();
4740 unemitted_tinfo_decls->iterate (--i, &t);)
4741 if (emit_tinfo_decl (t))
4744 unemitted_tinfo_decls->unordered_remove (i);
4747 /* The list of objects with static storage duration is built up
4748 in reverse order. We clear STATIC_AGGREGATES so that any new
4749 aggregates added during the initialization of these will be
4750 initialized in the correct order when we next come around the
4752 vars = prune_vars_needing_no_initialization (&static_aggregates);
4756 /* We need to start a new initialization function each time
4757 through the loop. That's because we need to know which
4758 vtables have been referenced, and TREE_SYMBOL_REFERENCED
4759 isn't computed until a function is finished, and written
4760 out. That's a deficiency in the back end. When this is
4761 fixed, these initialization functions could all become
4762 inline, with resulting performance improvements. */
4765 /* Set the line and file, so that it is obviously not from
4767 input_location = locus_at_end_of_parsing;
4768 ssdf_body = start_static_storage_duration_function (ssdf_count);
4770 /* Make sure the back end knows about all the variables. */
4771 write_out_vars (vars);
4773 /* First generate code to do all the initializations. */
4775 do_static_initialization_or_destruction (vars, /*initp=*/true);
4777 /* Then, generate code to do all the destructions. Do these
4778 in reverse order so that the most recently constructed
4779 variable is the first destroyed. If we're using
4780 __cxa_atexit, then we don't need to do this; functions
4781 were registered at initialization time to destroy the
4783 if (!flag_use_cxa_atexit && vars)
4785 vars = nreverse (vars);
4786 do_static_initialization_or_destruction (vars, /*initp=*/false);
4791 /* Finish up the static storage duration function for this
4793 input_location = locus_at_end_of_parsing;
4794 finish_static_storage_duration_function (ssdf_body);
4796 /* All those initializations and finalizations might cause
4797 us to need more inline functions, more template
4798 instantiations, etc. */
4801 /* ??? was: locus_at_end_of_parsing.line++; */
4804 /* Now do the same for thread_local variables. */
4807 /* Go through the set of inline functions whose bodies have not
4808 been emitted yet. If out-of-line copies of these functions
4809 are required, emit them. */
4810 FOR_EACH_VEC_SAFE_ELT (deferred_fns, i, decl)
4812 /* Does it need synthesizing? */
4813 if (DECL_DEFAULTED_FN (decl) && ! DECL_INITIAL (decl)
4814 && (! DECL_REALLY_EXTERN (decl) || possibly_inlined_p (decl)))
4816 /* Even though we're already at the top-level, we push
4817 there again. That way, when we pop back a few lines
4818 hence, all of our state is restored. Otherwise,
4819 finish_function doesn't clean things up, and we end
4820 up with CURRENT_FUNCTION_DECL set. */
4821 push_to_top_level ();
4822 /* The decl's location will mark where it was first
4823 needed. Save that so synthesize method can indicate
4824 where it was needed from, in case of error */
4825 input_location = DECL_SOURCE_LOCATION (decl);
4826 synthesize_method (decl);
4827 pop_from_top_level ();
4831 if (!DECL_INITIAL (decl) && decl_tls_wrapper_p (decl))
4832 generate_tls_wrapper (decl);
4834 if (!DECL_SAVED_TREE (decl))
4837 cgraph_node *node = cgraph_node::get_create (decl);
4839 /* We lie to the back end, pretending that some functions
4840 are not defined when they really are. This keeps these
4841 functions from being put out unnecessarily. But, we must
4842 stop lying when the functions are referenced, or if they
4843 are not comdat since they need to be put out now. If
4844 DECL_INTERFACE_KNOWN, then we have already set
4845 DECL_EXTERNAL appropriately, so there's no need to check
4846 again, and we do not want to clear DECL_EXTERNAL if a
4847 previous call to import_export_decl set it.
4849 This is done in a separate for cycle, because if some
4850 deferred function is contained in another deferred
4851 function later in deferred_fns varray,
4852 rest_of_compilation would skip this function and we
4853 really cannot expand the same function twice. */
4854 import_export_decl (decl);
4855 if (DECL_NOT_REALLY_EXTERN (decl)
4856 && DECL_INITIAL (decl)
4857 && decl_needed_p (decl))
4859 if (node->cpp_implicit_alias)
4860 node = node->get_alias_target ();
4862 node->call_for_symbol_thunks_and_aliases (clear_decl_external,
4864 /* If we mark !DECL_EXTERNAL one of the symbols in some comdat
4865 group, we need to mark all symbols in the same comdat group
4867 if (node->same_comdat_group)
4868 for (cgraph_node *next
4869 = dyn_cast<cgraph_node *> (node->same_comdat_group);
4871 next = dyn_cast<cgraph_node *> (next->same_comdat_group))
4872 next->call_for_symbol_thunks_and_aliases (clear_decl_external,
4876 /* If we're going to need to write this function out, and
4877 there's already a body for it, create RTL for it now.
4878 (There might be no body if this is a method we haven't
4879 gotten around to synthesizing yet.) */
4880 if (!DECL_EXTERNAL (decl)
4881 && decl_needed_p (decl)
4882 && !TREE_ASM_WRITTEN (decl)
4883 && !node->definition)
4885 /* We will output the function; no longer consider it in this
4887 DECL_DEFER_OUTPUT (decl) = 0;
4888 /* Generate RTL for this function now that we know we
4890 expand_or_defer_fn (decl);
4891 /* If we're compiling -fsyntax-only pretend that this
4892 function has been written out so that we don't try to
4894 if (flag_syntax_only)
4895 TREE_ASM_WRITTEN (decl) = 1;
4900 if (wrapup_namespace_globals ())
4903 /* Static data members are just like namespace-scope globals. */
4904 FOR_EACH_VEC_SAFE_ELT (pending_statics, i, decl)
4906 if (var_finalized_p (decl) || DECL_REALLY_EXTERN (decl)
4907 /* Don't write it out if we haven't seen a definition. */
4908 || (DECL_IN_AGGR_P (decl) && !DECL_INLINE_VAR_P (decl))
4909 /* Or haven't instantiated it. */
4910 || (DECL_TEMPLATE_INSTANTIATION (decl)
4911 && !DECL_TEMPLATE_INSTANTIATED (decl)))
4913 import_export_decl (decl);
4914 /* If this static data member is needed, provide it to the
4916 if (DECL_NOT_REALLY_EXTERN (decl) && decl_needed_p (decl))
4917 DECL_EXTERNAL (decl) = 0;
4919 if (vec_safe_length (pending_statics) != 0
4920 && wrapup_global_declarations (pending_statics->address (),
4921 pending_statics->length ()))
4930 generate_mangling_aliases ();
4932 /* All used inline functions must have a definition at this point. */
4933 FOR_EACH_VEC_SAFE_ELT (deferred_fns, i, decl)
4935 if (/* Check online inline functions that were actually used. */
4936 DECL_ODR_USED (decl) && DECL_DECLARED_INLINE_P (decl)
4937 /* If the definition actually was available here, then the
4938 fact that the function was not defined merely represents
4939 that for some reason (use of a template repository,
4940 #pragma interface, etc.) we decided not to emit the
4942 && !DECL_INITIAL (decl)
4943 /* Don't complain if the template was defined. */
4944 && !(DECL_TEMPLATE_INSTANTIATION (decl)
4945 && DECL_INITIAL (DECL_TEMPLATE_RESULT
4946 (template_for_substitution (decl)))))
4948 warning_at (DECL_SOURCE_LOCATION (decl), 0,
4949 "inline function %qD used but never defined", decl);
4950 /* Avoid a duplicate warning from check_global_declaration. */
4951 TREE_NO_WARNING (decl) = 1;
4955 /* So must decls that use a type with no linkage. */
4956 FOR_EACH_VEC_SAFE_ELT (no_linkage_decls, i, decl)
4957 no_linkage_error (decl);
4959 maybe_warn_sized_delete ();
4961 /* Then, do the Objective-C stuff. This is where all the
4962 Objective-C module stuff gets generated (symtab,
4963 class/protocol/selector lists etc). This must be done after C++
4964 templates, destructors etc. so that selectors used in C++
4965 templates are properly allocated. */
4966 if (c_dialect_objc ())
4967 objc_write_global_declarations ();
4969 /* We give C linkage to static constructors and destructors. */
4970 push_lang_context (lang_name_c);
4972 /* Generate initialization and destruction functions for all
4973 priorities for which they are required. */
4974 if (priority_info_map)
4975 splay_tree_foreach (priority_info_map,
4976 generate_ctor_and_dtor_functions_for_priority,
4977 /*data=*/&locus_at_end_of_parsing);
4978 else if (c_dialect_objc () && objc_static_init_needed_p ())
4979 /* If this is obj-c++ and we need a static init, call
4980 generate_ctor_or_dtor_function. */
4981 generate_ctor_or_dtor_function (/*constructor_p=*/true,
4982 DEFAULT_INIT_PRIORITY,
4983 &locus_at_end_of_parsing);
4985 /* We're done with the splay-tree now. */
4986 if (priority_info_map)
4987 splay_tree_delete (priority_info_map);
4989 /* Generate any missing aliases. */
4990 maybe_apply_pending_pragma_weaks ();
4992 /* We're done with static constructors, so we can go back to "C++"
4994 pop_lang_context ();
4996 if (flag_vtable_verify)
4998 vtv_recover_class_info ();
4999 vtv_compute_class_hierarchy_transitive_closure ();
5000 vtv_build_vtable_verify_fndecl ();
5003 perform_deferred_noexcept_checks ();
5008 /* The entire file is now complete. If requested, dump everything
5012 if (flag_detailed_statistics)
5014 dump_tree_statistics ();
5015 dump_time_statistics ();
5018 timevar_stop (TV_PHASE_DEFERRED);
5019 timevar_start (TV_PHASE_PARSING);
5021 /* Indicate that we're done with front end processing. */
5025 /* Perform any post compilation-proper cleanups for the C++ front-end.
5026 This should really go away. No front-end should need to do
5027 anything past the compilation process. */
5030 cxx_post_compilation_parsing_cleanups (void)
5032 timevar_start (TV_PHASE_LATE_PARSING_CLEANUPS);
5034 if (flag_vtable_verify)
5036 /* Generate the special constructor initialization function that
5037 calls __VLTRegisterPairs, and give it a very high
5038 initialization priority. This must be done after
5039 finalize_compilation_unit so that we have accurate
5040 information about which vtable will actually be emitted. */
5041 vtv_generate_init_routine ();
5044 input_location = locus_at_end_of_parsing;
5047 validate_conversion_obstack ();
5049 timevar_stop (TV_PHASE_LATE_PARSING_CLEANUPS);
5052 /* FN is an OFFSET_REF, DOTSTAR_EXPR or MEMBER_REF indicating the
5053 function to call in parse-tree form; it has not yet been
5054 semantically analyzed. ARGS are the arguments to the function.
5055 They have already been semantically analyzed. This may change
5059 build_offset_ref_call_from_tree (tree fn, vec<tree, va_gc> **args,
5060 tsubst_flags_t complain)
5063 vec<tree, va_gc> *orig_args = NULL;
5068 object = TREE_OPERAND (fn, 0);
5070 if (processing_template_decl)
5072 gcc_assert (TREE_CODE (fn) == DOTSTAR_EXPR
5073 || TREE_CODE (fn) == MEMBER_REF);
5074 if (type_dependent_expression_p (fn)
5075 || any_type_dependent_arguments_p (*args))
5076 return build_min_nt_call_vec (fn, *args);
5078 orig_args = make_tree_vector_copy (*args);
5080 /* Transform the arguments and add the implicit "this"
5081 parameter. That must be done before the FN is transformed
5082 because we depend on the form of FN. */
5083 make_args_non_dependent (*args);
5084 object = build_non_dependent_expr (object);
5085 if (TREE_CODE (TREE_TYPE (fn)) == METHOD_TYPE)
5087 if (TREE_CODE (fn) == DOTSTAR_EXPR)
5088 object = cp_build_addr_expr (object, complain);
5089 vec_safe_insert (*args, 0, object);
5091 /* Now that the arguments are done, transform FN. */
5092 fn = build_non_dependent_expr (fn);
5095 /* A qualified name corresponding to a bound pointer-to-member is
5096 represented as an OFFSET_REF:
5098 struct B { void g(); };
5100 void B::g() { (this->*p)(); } */
5101 if (TREE_CODE (fn) == OFFSET_REF)
5103 tree object_addr = cp_build_addr_expr (object, complain);
5104 fn = TREE_OPERAND (fn, 1);
5105 fn = get_member_function_from_ptrfunc (&object_addr, fn,
5107 vec_safe_insert (*args, 0, object_addr);
5110 if (CLASS_TYPE_P (TREE_TYPE (fn)))
5111 expr = build_op_call (fn, args, complain);
5113 expr = cp_build_function_call_vec (fn, args, complain);
5114 if (processing_template_decl && expr != error_mark_node)
5115 expr = build_min_non_dep_call_vec (expr, orig_fn, orig_args);
5117 if (orig_args != NULL)
5118 release_tree_vector (orig_args);
5125 check_default_args (tree x)
5127 tree arg = TYPE_ARG_TYPES (TREE_TYPE (x));
5128 bool saw_def = false;
5129 int i = 0 - (TREE_CODE (TREE_TYPE (x)) == METHOD_TYPE);
5130 for (; arg && arg != void_list_node; arg = TREE_CHAIN (arg), ++i)
5132 if (TREE_PURPOSE (arg))
5134 else if (saw_def && !PACK_EXPANSION_P (TREE_VALUE (arg)))
5136 error ("default argument missing for parameter %P of %q+#D", i, x);
5137 TREE_PURPOSE (arg) = error_mark_node;
5142 /* Return true if function DECL can be inlined. This is used to force
5143 instantiation of methods that might be interesting for inlining. */
5145 possibly_inlined_p (tree decl)
5147 gcc_assert (TREE_CODE (decl) == FUNCTION_DECL);
5148 if (DECL_UNINLINABLE (decl))
5151 return DECL_DECLARED_INLINE_P (decl);
5152 /* When optimizing, we might inline everything when flatten
5153 attribute or heuristics inlining for size or autoinlining
5158 /* Normally, we can wait until instantiation-time to synthesize DECL.
5159 However, if DECL is a static data member initialized with a constant
5160 or a constexpr function, we need it right now because a reference to
5161 such a data member or a call to such function is not value-dependent.
5162 For a function that uses auto in the return type, we need to instantiate
5163 it to find out its type. For OpenMP user defined reductions, we need
5164 them instantiated for reduction clauses which inline them by hand
5168 maybe_instantiate_decl (tree decl)
5170 if (DECL_LANG_SPECIFIC (decl)
5171 && DECL_TEMPLATE_INFO (decl)
5172 && (decl_maybe_constant_var_p (decl)
5173 || (TREE_CODE (decl) == FUNCTION_DECL
5174 && DECL_OMP_DECLARE_REDUCTION_P (decl))
5175 || undeduced_auto_decl (decl))
5176 && !DECL_DECLARED_CONCEPT_P (decl)
5177 && !uses_template_parms (DECL_TI_ARGS (decl)))
5179 /* Instantiating a function will result in garbage collection. We
5180 must treat this situation as if we were within the body of a
5181 function so as to avoid collecting live data only referenced from
5182 the stack (such as overload resolution candidates). */
5184 instantiate_decl (decl, /*defer_ok=*/false,
5185 /*expl_inst_class_mem_p=*/false);
5190 /* Mark DECL (either a _DECL or a BASELINK) as "used" in the program.
5191 If DECL is a specialization or implicitly declared class member,
5192 generate the actual definition. Return false if something goes
5193 wrong, true otherwise. */
5196 mark_used (tree decl, tsubst_flags_t complain)
5198 /* If we're just testing conversions or resolving overloads, we
5199 don't want any permanent effects like forcing functions to be
5200 output or instantiating templates. */
5201 if ((complain & tf_conv))
5204 /* If DECL is a BASELINK for a single function, then treat it just
5205 like the DECL for the function. Otherwise, if the BASELINK is
5206 for an overloaded function, we don't know which function was
5207 actually used until after overload resolution. */
5208 if (BASELINK_P (decl))
5210 decl = BASELINK_FUNCTIONS (decl);
5211 if (really_overloaded_fn (decl))
5213 decl = OVL_FIRST (decl);
5216 /* Set TREE_USED for the benefit of -Wunused. */
5217 TREE_USED (decl) = 1;
5218 /* And for structured bindings also the underlying decl. */
5219 if (DECL_DECOMPOSITION_P (decl) && DECL_DECOMP_BASE (decl))
5220 TREE_USED (DECL_DECOMP_BASE (decl)) = 1;
5222 if (TREE_CODE (decl) == TEMPLATE_DECL)
5225 if (DECL_CLONED_FUNCTION_P (decl))
5226 TREE_USED (DECL_CLONED_FUNCTION (decl)) = 1;
5228 /* Mark enumeration types as used. */
5229 if (TREE_CODE (decl) == CONST_DECL)
5230 used_types_insert (DECL_CONTEXT (decl));
5232 if (TREE_CODE (decl) == FUNCTION_DECL
5233 && !maybe_instantiate_noexcept (decl, complain))
5236 if (TREE_CODE (decl) == FUNCTION_DECL
5237 && DECL_DELETED_FN (decl))
5239 if (DECL_ARTIFICIAL (decl)
5240 && DECL_CONV_FN_P (decl)
5241 && LAMBDA_TYPE_P (DECL_CONTEXT (decl)))
5242 /* We mark a lambda conversion op as deleted if we can't
5243 generate it properly; see maybe_add_lambda_conv_op. */
5244 sorry ("converting lambda that uses %<...%> to function pointer");
5245 else if (complain & tf_error)
5247 error ("use of deleted function %qD", decl);
5248 if (!maybe_explain_implicit_delete (decl))
5249 inform (DECL_SOURCE_LOCATION (decl), "declared here");
5254 if (TREE_DEPRECATED (decl) && (complain & tf_warning)
5255 && deprecated_state != DEPRECATED_SUPPRESS)
5256 warn_deprecated_use (decl, NULL_TREE);
5258 /* We can only check DECL_ODR_USED on variables or functions with
5259 DECL_LANG_SPECIFIC set, and these are also the only decls that we
5260 might need special handling for. */
5261 if (!VAR_OR_FUNCTION_DECL_P (decl)
5262 || DECL_LANG_SPECIFIC (decl) == NULL
5263 || DECL_THUNK_P (decl))
5265 if (!processing_template_decl
5266 && !require_deduced_type (decl, complain))
5271 /* We only want to do this processing once. We don't need to keep trying
5272 to instantiate inline templates, because unit-at-a-time will make sure
5273 we get them compiled before functions that want to inline them. */
5274 if (DECL_ODR_USED (decl))
5277 /* Normally, we can wait until instantiation-time to synthesize DECL.
5278 However, if DECL is a static data member initialized with a constant
5279 or a constexpr function, we need it right now because a reference to
5280 such a data member or a call to such function is not value-dependent.
5281 For a function that uses auto in the return type, we need to instantiate
5282 it to find out its type. For OpenMP user defined reductions, we need
5283 them instantiated for reduction clauses which inline them by hand
5285 maybe_instantiate_decl (decl);
5287 if (processing_template_decl || in_template_function ())
5290 /* Check this too in case we're within instantiate_non_dependent_expr. */
5291 if (DECL_TEMPLATE_INFO (decl)
5292 && uses_template_parms (DECL_TI_ARGS (decl)))
5295 if (!require_deduced_type (decl, complain))
5298 if (builtin_pack_fn_p (decl))
5300 error ("use of built-in parameter pack %qD outside of a template",
5305 /* If we don't need a value, then we don't need to synthesize DECL. */
5306 if (cp_unevaluated_operand || in_discarded_stmt)
5309 DECL_ODR_USED (decl) = 1;
5310 if (DECL_CLONED_FUNCTION_P (decl))
5311 DECL_ODR_USED (DECL_CLONED_FUNCTION (decl)) = 1;
5313 /* DR 757: A type without linkage shall not be used as the type of a
5314 variable or function with linkage, unless
5315 o the variable or function has extern "C" linkage (7.5 [dcl.link]), or
5316 o the variable or function is not used (3.2 [basic.def.odr]) or is
5317 defined in the same translation unit. */
5318 if (cxx_dialect > cxx98
5319 && decl_linkage (decl) != lk_none
5320 && !DECL_EXTERN_C_P (decl)
5321 && !DECL_ARTIFICIAL (decl)
5322 && !decl_defined_p (decl)
5323 && no_linkage_check (TREE_TYPE (decl), /*relaxed_p=*/false))
5325 if (is_local_extern (decl))
5326 /* There's no way to define a local extern, and adding it to
5327 the vector interferes with GC, so give an error now. */
5328 no_linkage_error (decl);
5330 vec_safe_push (no_linkage_decls, decl);
5333 if (TREE_CODE (decl) == FUNCTION_DECL && DECL_DECLARED_INLINE_P (decl)
5334 && !DECL_INITIAL (decl) && !DECL_ARTIFICIAL (decl))
5335 /* Remember it, so we can check it was defined. */
5336 note_vague_linkage_fn (decl);
5338 /* Is it a synthesized method that needs to be synthesized? */
5339 if (TREE_CODE (decl) == FUNCTION_DECL
5340 && DECL_NONSTATIC_MEMBER_FUNCTION_P (decl)
5341 && DECL_DEFAULTED_FN (decl)
5342 /* A function defaulted outside the class is synthesized either by
5343 cp_finish_decl or instantiate_decl. */
5344 && !DECL_DEFAULTED_OUTSIDE_CLASS_P (decl)
5345 && ! DECL_INITIAL (decl))
5347 /* Defer virtual destructors so that thunks get the right
5349 if (DECL_VIRTUAL_P (decl) && !at_eof)
5351 note_vague_linkage_fn (decl);
5355 /* Remember the current location for a function we will end up
5356 synthesizing. Then we can inform the user where it was
5357 required in the case of error. */
5358 DECL_SOURCE_LOCATION (decl) = input_location;
5360 /* Synthesizing an implicitly defined member function will result in
5361 garbage collection. We must treat this situation as if we were
5362 within the body of a function so as to avoid collecting live data
5363 on the stack (such as overload resolution candidates).
5365 We could just let cp_write_global_declarations handle synthesizing
5366 this function by adding it to deferred_fns, but doing
5367 it at the use site produces better error messages. */
5369 synthesize_method (decl);
5371 /* If this is a synthesized method we don't need to
5372 do the instantiation test below. */
5374 else if (VAR_OR_FUNCTION_DECL_P (decl)
5375 && DECL_TEMPLATE_INFO (decl)
5376 && !DECL_DECLARED_CONCEPT_P (decl)
5377 && (!DECL_EXPLICIT_INSTANTIATION (decl)
5378 || always_instantiate_p (decl)))
5379 /* If this is a function or variable that is an instance of some
5380 template, we now know that we will need to actually do the
5381 instantiation. We check that DECL is not an explicit
5382 instantiation because that is not checked in instantiate_decl.
5384 We put off instantiating functions in order to improve compile
5385 times. Maintaining a stack of active functions is expensive,
5386 and the inliner knows to instantiate any functions it might
5387 need. Therefore, we always try to defer instantiation. */
5390 instantiate_decl (decl, /*defer_ok=*/true,
5391 /*expl_inst_class_mem_p=*/false);
5399 mark_used (tree decl)
5401 return mark_used (decl, tf_warning_or_error);
5405 vtv_start_verification_constructor_init_function (void)
5407 return start_objects ('I', MAX_RESERVED_INIT_PRIORITY - 1);
5411 vtv_finish_verification_constructor_init_function (tree function_body)
5415 finish_compound_stmt (function_body);
5416 fn = finish_function (/*inline_p=*/false);
5417 DECL_STATIC_CONSTRUCTOR (fn) = 1;
5418 decl_init_priority_insert (fn, MAX_RESERVED_INIT_PRIORITY - 1);
5423 #include "gt-cp-decl2.h"