1 /* Process declarations and variables for C++ compiler.
2 Copyright (C) 1988-2015 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"
36 #include "double-int.h"
43 #include "stringpool.h"
46 #include "stor-layout.h"
55 #include "c-family/c-common.h"
56 #include "c-family/c-objc.h"
59 #include "plugin-api.h"
60 #include "hard-reg-set.h"
65 #include "tree-inline.h"
66 #include "c-family/c-pragma.h"
69 #include "splay-tree.h"
70 #include "langhooks.h"
71 #include "c-family/c-ada-spec.h"
74 extern cpp_reader *parse_in;
76 /* This structure contains information about the initializations
77 and/or destructions required for a particular priority level. */
78 typedef struct priority_info_s {
79 /* Nonzero if there have been any initializations at this priority
80 throughout the translation unit. */
81 int initializations_p;
82 /* Nonzero if there have been any destructions at this priority
83 throughout the translation unit. */
87 static void mark_vtable_entries (tree);
88 static bool maybe_emit_vtables (tree);
89 static bool acceptable_java_type (tree);
90 static tree start_objects (int, int);
91 static void finish_objects (int, int, tree);
92 static tree start_static_storage_duration_function (unsigned);
93 static void finish_static_storage_duration_function (tree);
94 static priority_info get_priority_info (int);
95 static void do_static_initialization_or_destruction (tree, bool);
96 static void one_static_initialization_or_destruction (tree, tree, bool);
97 static void generate_ctor_or_dtor_function (bool, int, location_t *);
98 static int generate_ctor_and_dtor_functions_for_priority (splay_tree_node,
100 static tree prune_vars_needing_no_initialization (tree *);
101 static void write_out_vars (tree);
102 static void import_export_class (tree);
103 static tree get_guard_bits (tree);
104 static void determine_visibility_from_class (tree, tree);
105 static bool determine_hidden_inline (tree);
106 static bool decl_defined_p (tree);
108 /* A list of static class variables. This is needed, because a
109 static class variable can be declared inside the class without
110 an initializer, and then initialized, statically, outside the class. */
111 static GTY(()) vec<tree, va_gc> *pending_statics;
113 /* A list of functions which were declared inline, but which we
114 may need to emit outline anyway. */
115 static GTY(()) vec<tree, va_gc> *deferred_fns;
117 /* A list of decls that use types with no linkage, which we need to make
119 static GTY(()) vec<tree, va_gc> *no_linkage_decls;
121 /* A vector of alternating decls and identifiers, where the latter
122 is to be an alias for the former if the former is defined. */
123 static GTY(()) vec<tree, va_gc> *mangling_aliases;
125 /* Nonzero if we're done parsing and into end-of-file activities. */
129 /* True if note_mangling_alias should enqueue mangling aliases for
130 later generation, rather than emitting them right away. */
132 bool defer_mangling_aliases = true;
135 /* Return a member function type (a METHOD_TYPE), given FNTYPE (a
136 FUNCTION_TYPE), CTYPE (class type), and QUALS (the cv-qualifiers
137 that apply to the function). */
140 build_memfn_type (tree fntype, tree ctype, cp_cv_quals quals,
141 cp_ref_qualifier rqual)
146 bool late_return_type_p;
148 if (fntype == error_mark_node || ctype == error_mark_node)
149 return error_mark_node;
151 gcc_assert (TREE_CODE (fntype) == FUNCTION_TYPE
152 || TREE_CODE (fntype) == METHOD_TYPE);
154 type_quals = quals & ~TYPE_QUAL_RESTRICT;
155 ctype = cp_build_qualified_type (ctype, type_quals);
156 raises = TYPE_RAISES_EXCEPTIONS (fntype);
157 attrs = TYPE_ATTRIBUTES (fntype);
158 late_return_type_p = TYPE_HAS_LATE_RETURN_TYPE (fntype);
159 fntype = build_method_type_directly (ctype, TREE_TYPE (fntype),
160 (TREE_CODE (fntype) == METHOD_TYPE
161 ? TREE_CHAIN (TYPE_ARG_TYPES (fntype))
162 : TYPE_ARG_TYPES (fntype)));
164 fntype = cp_build_type_attribute_variant (fntype, attrs);
166 fntype = build_ref_qualified_type (fntype, rqual);
168 fntype = build_exception_variant (fntype, raises);
169 if (late_return_type_p)
170 TYPE_HAS_LATE_RETURN_TYPE (fntype) = 1;
175 /* Return a variant of FNTYPE, a FUNCTION_TYPE or METHOD_TYPE, with its
176 return type changed to NEW_RET. */
179 change_return_type (tree new_ret, tree fntype)
182 tree args = TYPE_ARG_TYPES (fntype);
183 tree raises = TYPE_RAISES_EXCEPTIONS (fntype);
184 tree attrs = TYPE_ATTRIBUTES (fntype);
185 bool late_return_type_p = TYPE_HAS_LATE_RETURN_TYPE (fntype);
187 if (new_ret == error_mark_node)
190 if (same_type_p (new_ret, TREE_TYPE (fntype)))
193 if (TREE_CODE (fntype) == FUNCTION_TYPE)
195 newtype = build_function_type (new_ret, args);
196 newtype = apply_memfn_quals (newtype,
197 type_memfn_quals (fntype),
198 type_memfn_rqual (fntype));
201 newtype = build_method_type_directly
202 (class_of_this_parm (fntype), new_ret, TREE_CHAIN (args));
204 newtype = build_exception_variant (newtype, raises);
206 newtype = cp_build_type_attribute_variant (newtype, attrs);
207 if (late_return_type_p)
208 TYPE_HAS_LATE_RETURN_TYPE (newtype) = 1;
213 /* Build a PARM_DECL with NAME and TYPE, and set DECL_ARG_TYPE
217 cp_build_parm_decl (tree name, tree type)
219 tree parm = build_decl (input_location,
220 PARM_DECL, name, type);
221 /* DECL_ARG_TYPE is only used by the back end and the back end never
223 if (!processing_template_decl)
224 DECL_ARG_TYPE (parm) = type_passed_as (type);
229 /* Returns a PARM_DECL for a parameter of the indicated TYPE, with the
233 build_artificial_parm (tree name, tree type)
235 tree parm = cp_build_parm_decl (name, type);
236 DECL_ARTIFICIAL (parm) = 1;
237 /* All our artificial parms are implicitly `const'; they cannot be
239 TREE_READONLY (parm) = 1;
243 /* Constructors for types with virtual baseclasses need an "in-charge" flag
244 saying whether this constructor is responsible for initialization of
245 virtual baseclasses or not. All destructors also need this "in-charge"
246 flag, which additionally determines whether or not the destructor should
247 free the memory for the object.
249 This function adds the "in-charge" flag to member function FN if
250 appropriate. It is called from grokclassfn and tsubst.
251 FN must be either a constructor or destructor.
253 The in-charge flag follows the 'this' parameter, and is followed by the
254 VTT parm (if any), then the user-written parms. */
257 maybe_retrofit_in_chrg (tree fn)
259 tree basetype, arg_types, parms, parm, fntype;
261 /* If we've already add the in-charge parameter don't do it again. */
262 if (DECL_HAS_IN_CHARGE_PARM_P (fn))
265 /* When processing templates we can't know, in general, whether or
266 not we're going to have virtual baseclasses. */
267 if (processing_template_decl)
270 /* We don't need an in-charge parameter for constructors that don't
271 have virtual bases. */
272 if (DECL_CONSTRUCTOR_P (fn)
273 && !CLASSTYPE_VBASECLASSES (DECL_CONTEXT (fn)))
276 arg_types = TYPE_ARG_TYPES (TREE_TYPE (fn));
277 basetype = TREE_TYPE (TREE_VALUE (arg_types));
278 arg_types = TREE_CHAIN (arg_types);
280 parms = DECL_CHAIN (DECL_ARGUMENTS (fn));
282 /* If this is a subobject constructor or destructor, our caller will
283 pass us a pointer to our VTT. */
284 if (CLASSTYPE_VBASECLASSES (DECL_CONTEXT (fn)))
286 parm = build_artificial_parm (vtt_parm_identifier, vtt_parm_type);
288 /* First add it to DECL_ARGUMENTS between 'this' and the real args... */
289 DECL_CHAIN (parm) = parms;
292 /* ...and then to TYPE_ARG_TYPES. */
293 arg_types = hash_tree_chain (vtt_parm_type, arg_types);
295 DECL_HAS_VTT_PARM_P (fn) = 1;
298 /* Then add the in-charge parm (before the VTT parm). */
299 parm = build_artificial_parm (in_charge_identifier, integer_type_node);
300 DECL_CHAIN (parm) = parms;
302 arg_types = hash_tree_chain (integer_type_node, arg_types);
304 /* Insert our new parameter(s) into the list. */
305 DECL_CHAIN (DECL_ARGUMENTS (fn)) = parms;
307 /* And rebuild the function type. */
308 fntype = build_method_type_directly (basetype, TREE_TYPE (TREE_TYPE (fn)),
310 if (TYPE_RAISES_EXCEPTIONS (TREE_TYPE (fn)))
311 fntype = build_exception_variant (fntype,
312 TYPE_RAISES_EXCEPTIONS (TREE_TYPE (fn)));
313 if (TYPE_ATTRIBUTES (TREE_TYPE (fn)))
314 fntype = (cp_build_type_attribute_variant
315 (fntype, TYPE_ATTRIBUTES (TREE_TYPE (fn))));
316 TREE_TYPE (fn) = fntype;
318 /* Now we've got the in-charge parameter. */
319 DECL_HAS_IN_CHARGE_PARM_P (fn) = 1;
322 /* Classes overload their constituent function names automatically.
323 When a function name is declared in a record structure,
324 its name is changed to it overloaded name. Since names for
325 constructors and destructors can conflict, we place a leading
328 CNAME is the name of the class we are grokking for.
330 FUNCTION is a FUNCTION_DECL. It was created by `grokdeclarator'.
332 FLAGS contains bits saying what's special about today's
333 arguments. DTOR_FLAG == DESTRUCTOR.
335 If FUNCTION is a destructor, then we must add the `auto-delete' field
336 as a second parameter. There is some hair associated with the fact
337 that we must "declare" this variable in the manner consistent with the
338 way the rest of the arguments were declared.
340 QUALS are the qualifiers for the this pointer. */
343 grokclassfn (tree ctype, tree function, enum overload_flags flags)
345 tree fn_name = DECL_NAME (function);
347 /* Even within an `extern "C"' block, members get C++ linkage. See
348 [dcl.link] for details. */
349 SET_DECL_LANGUAGE (function, lang_cplusplus);
351 if (fn_name == NULL_TREE)
353 error ("name missing for member function");
354 fn_name = get_identifier ("<anonymous>");
355 DECL_NAME (function) = fn_name;
358 DECL_CONTEXT (function) = ctype;
360 if (flags == DTOR_FLAG)
361 DECL_DESTRUCTOR_P (function) = 1;
363 if (flags == DTOR_FLAG || DECL_CONSTRUCTOR_P (function))
364 maybe_retrofit_in_chrg (function);
367 /* Create an ARRAY_REF, checking for the user doing things backwards
368 along the way. DECLTYPE_P is for N3276, as in the parser. */
371 grok_array_decl (location_t loc, tree array_expr, tree index_exp,
376 tree orig_array_expr = array_expr;
377 tree orig_index_exp = index_exp;
379 if (error_operand_p (array_expr) || error_operand_p (index_exp))
380 return error_mark_node;
382 if (processing_template_decl)
384 if (type_dependent_expression_p (array_expr)
385 || type_dependent_expression_p (index_exp))
386 return build_min_nt_loc (loc, ARRAY_REF, array_expr, index_exp,
387 NULL_TREE, NULL_TREE);
388 array_expr = build_non_dependent_expr (array_expr);
389 index_exp = build_non_dependent_expr (index_exp);
392 type = TREE_TYPE (array_expr);
394 type = non_reference (type);
396 /* If they have an `operator[]', use that. */
397 if (MAYBE_CLASS_TYPE_P (type) || MAYBE_CLASS_TYPE_P (TREE_TYPE (index_exp)))
399 tsubst_flags_t complain = tf_warning_or_error;
401 complain |= tf_decltype;
402 expr = build_new_op (loc, ARRAY_REF, LOOKUP_NORMAL, array_expr,
403 index_exp, NULL_TREE, /*overload=*/NULL, complain);
409 /* Otherwise, create an ARRAY_REF for a pointer or array type.
410 It is a little-known fact that, if `a' is an array and `i' is
411 an int, you can write `i[a]', which means the same thing as
413 if (TREE_CODE (type) == ARRAY_TYPE || TREE_CODE (type) == VECTOR_TYPE)
416 p1 = build_expr_type_conversion (WANT_POINTER, array_expr, false);
418 if (TREE_CODE (TREE_TYPE (index_exp)) == ARRAY_TYPE)
421 p2 = build_expr_type_conversion (WANT_POINTER, index_exp, false);
423 i1 = build_expr_type_conversion (WANT_INT | WANT_ENUM, array_expr,
425 i2 = build_expr_type_conversion (WANT_INT | WANT_ENUM, index_exp,
428 if ((p1 && i2) && (i1 && p2))
429 error ("ambiguous conversion for array subscript");
432 array_expr = p1, index_exp = i2;
434 array_expr = p2, index_exp = i1;
437 error ("invalid types %<%T[%T]%> for array subscript",
438 type, TREE_TYPE (index_exp));
439 return error_mark_node;
442 if (array_expr == error_mark_node || index_exp == error_mark_node)
443 error ("ambiguous conversion for array subscript");
445 expr = build_array_ref (input_location, array_expr, index_exp);
447 if (processing_template_decl && expr != error_mark_node)
448 return build_min_non_dep (ARRAY_REF, expr, orig_array_expr, orig_index_exp,
449 NULL_TREE, NULL_TREE);
453 /* Given the cast expression EXP, checking out its validity. Either return
454 an error_mark_node if there was an unavoidable error, return a cast to
455 void for trying to delete a pointer w/ the value 0, or return the
456 call to delete. If DOING_VEC is true, we handle things differently
457 for doing an array delete.
458 Implements ARM $5.3.4. This is called from the parser. */
461 delete_sanity (tree exp, tree size, bool doing_vec, int use_global_delete,
462 tsubst_flags_t complain)
466 if (exp == error_mark_node)
469 if (processing_template_decl)
471 t = build_min (DELETE_EXPR, void_type_node, exp, size);
472 DELETE_EXPR_USE_GLOBAL (t) = use_global_delete;
473 DELETE_EXPR_USE_VEC (t) = doing_vec;
474 TREE_SIDE_EFFECTS (t) = 1;
478 /* An array can't have been allocated by new, so complain. */
479 if (TREE_CODE (TREE_TYPE (exp)) == ARRAY_TYPE)
480 warning (0, "deleting array %q#E", exp);
482 t = build_expr_type_conversion (WANT_POINTER, exp, true);
484 if (t == NULL_TREE || t == error_mark_node)
486 error ("type %q#T argument given to %<delete%>, expected pointer",
488 return error_mark_node;
491 type = TREE_TYPE (t);
493 /* As of Valley Forge, you can delete a pointer to const. */
495 /* You can't delete functions. */
496 if (TREE_CODE (TREE_TYPE (type)) == FUNCTION_TYPE)
498 error ("cannot delete a function. Only pointer-to-objects are "
499 "valid arguments to %<delete%>");
500 return error_mark_node;
503 /* Deleting ptr to void is undefined behavior [expr.delete/3]. */
504 if (VOID_TYPE_P (TREE_TYPE (type)))
506 warning (OPT_Wdelete_incomplete, "deleting %qT is undefined", type);
510 /* Deleting a pointer with the value zero is valid and has no effect. */
511 if (integer_zerop (t))
512 return build1 (NOP_EXPR, void_type_node, t);
515 return build_vec_delete (t, /*maxindex=*/NULL_TREE,
516 sfk_deleting_destructor,
517 use_global_delete, complain);
519 return build_delete (type, t, sfk_deleting_destructor,
520 LOOKUP_NORMAL, use_global_delete,
524 /* Report an error if the indicated template declaration is not the
525 sort of thing that should be a member template. */
528 check_member_template (tree tmpl)
532 gcc_assert (TREE_CODE (tmpl) == TEMPLATE_DECL);
533 decl = DECL_TEMPLATE_RESULT (tmpl);
535 if (TREE_CODE (decl) == FUNCTION_DECL
536 || DECL_ALIAS_TEMPLATE_P (tmpl)
537 || (TREE_CODE (decl) == TYPE_DECL
538 && MAYBE_CLASS_TYPE_P (TREE_TYPE (decl))))
540 /* The parser rejects template declarations in local classes
541 (with the exception of generic lambdas). */
542 gcc_assert (!current_function_decl || LAMBDA_FUNCTION_P (decl));
543 /* The parser rejects any use of virtual in a function template. */
544 gcc_assert (!(TREE_CODE (decl) == FUNCTION_DECL
545 && DECL_VIRTUAL_P (decl)));
547 /* The debug-information generating code doesn't know what to do
548 with member templates. */
549 DECL_IGNORED_P (tmpl) = 1;
551 else if (variable_template_p (tmpl))
554 error ("template declaration of %q#D", decl);
557 /* Return true iff TYPE is a valid Java parameter or return type. */
560 acceptable_java_type (tree type)
562 if (type == error_mark_node)
565 if (VOID_TYPE_P (type) || TYPE_FOR_JAVA (type))
567 if (TYPE_PTR_P (type) || TREE_CODE (type) == REFERENCE_TYPE)
569 type = TREE_TYPE (type);
570 if (TREE_CODE (type) == RECORD_TYPE)
573 if (! TYPE_FOR_JAVA (type))
575 if (! CLASSTYPE_TEMPLATE_INFO (type))
577 args = CLASSTYPE_TI_ARGS (type);
578 i = TREE_VEC_LENGTH (args);
581 type = TREE_VEC_ELT (args, i);
582 if (TYPE_PTR_P (type))
583 type = TREE_TYPE (type);
584 if (! TYPE_FOR_JAVA (type))
593 /* For a METHOD in a Java class CTYPE, return true if
594 the parameter and return types are valid Java types.
595 Otherwise, print appropriate error messages, and return false. */
598 check_java_method (tree method)
601 tree arg_types = TYPE_ARG_TYPES (TREE_TYPE (method));
602 tree ret_type = TREE_TYPE (TREE_TYPE (method));
604 if (!acceptable_java_type (ret_type))
606 error ("Java method %qD has non-Java return type %qT",
611 arg_types = TREE_CHAIN (arg_types);
612 if (DECL_HAS_IN_CHARGE_PARM_P (method))
613 arg_types = TREE_CHAIN (arg_types);
614 if (DECL_HAS_VTT_PARM_P (method))
615 arg_types = TREE_CHAIN (arg_types);
617 for (; arg_types != NULL_TREE; arg_types = TREE_CHAIN (arg_types))
619 tree type = TREE_VALUE (arg_types);
620 if (!acceptable_java_type (type))
622 if (type != error_mark_node)
623 error ("Java method %qD has non-Java parameter type %qT",
631 /* Sanity check: report error if this function FUNCTION is not
632 really a member of the class (CTYPE) it is supposed to belong to.
633 TEMPLATE_PARMS is used to specify the template parameters of a member
634 template passed as FUNCTION_DECL. If the member template is passed as a
635 TEMPLATE_DECL, it can be NULL since the parameters can be extracted
636 from the declaration. If the function is not a function template, it
638 It returns the original declaration for the function, NULL_TREE if
639 no declaration was found, error_mark_node if an error was emitted. */
642 check_classfn (tree ctype, tree function, tree template_parms)
648 if (DECL_USE_TEMPLATE (function)
649 && !(TREE_CODE (function) == TEMPLATE_DECL
650 && DECL_TEMPLATE_SPECIALIZATION (function))
651 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (function)))
652 /* Since this is a specialization of a member template,
653 we're not going to find the declaration in the class.
656 struct S { template <typename T> void f(T); };
657 template <> void S::f(int);
659 we're not going to find `S::f(int)', but there's no
660 reason we should, either. We let our callers know we didn't
661 find the method, but we don't complain. */
664 /* Basic sanity check: for a template function, the template parameters
665 either were not passed, or they are the same of DECL_TEMPLATE_PARMS. */
666 if (TREE_CODE (function) == TEMPLATE_DECL)
669 && !comp_template_parms (template_parms,
670 DECL_TEMPLATE_PARMS (function)))
672 error ("template parameter lists provided don%'t match the "
673 "template parameters of %qD", function);
674 return error_mark_node;
676 template_parms = DECL_TEMPLATE_PARMS (function);
679 /* OK, is this a definition of a member template? */
680 is_template = (template_parms != NULL_TREE);
684 A destructor shall not be a member template. */
685 if (DECL_DESTRUCTOR_P (function) && is_template)
687 error ("destructor %qD declared as member template", function);
688 return error_mark_node;
691 /* We must enter the scope here, because conversion operators are
692 named by target type, and type equivalence relies on typenames
693 resolving within the scope of CTYPE. */
694 pushed_scope = push_scope (ctype);
695 ix = class_method_index_for_fn (complete_type (ctype), function);
698 vec<tree, va_gc> *methods = CLASSTYPE_METHOD_VEC (ctype);
699 tree fndecls, fndecl = 0;
701 const char *format = NULL;
703 for (fndecls = (*methods)[ix];
704 fndecls; fndecls = OVL_NEXT (fndecls))
708 fndecl = OVL_CURRENT (fndecls);
709 p1 = TYPE_ARG_TYPES (TREE_TYPE (function));
710 p2 = TYPE_ARG_TYPES (TREE_TYPE (fndecl));
712 /* We cannot simply call decls_match because this doesn't
713 work for static member functions that are pretending to
714 be methods, and because the name may have been changed by
717 /* Get rid of the this parameter on functions that become
719 if (DECL_STATIC_FUNCTION_P (fndecl)
720 && TREE_CODE (TREE_TYPE (function)) == METHOD_TYPE)
721 p1 = TREE_CHAIN (p1);
723 /* A member template definition only matches a member template
725 if (is_template != (TREE_CODE (fndecl) == TEMPLATE_DECL))
728 /* ref-qualifier or absence of same must match. */
729 if (type_memfn_rqual (TREE_TYPE (function))
730 != type_memfn_rqual (TREE_TYPE (fndecl)))
733 /* While finding a match, same types and params are not enough
734 if the function is versioned. Also check version ("target")
736 if (same_type_p (TREE_TYPE (TREE_TYPE (function)),
737 TREE_TYPE (TREE_TYPE (fndecl)))
738 && compparms (p1, p2)
739 && !targetm.target_option.function_versions (function, fndecl)
741 || comp_template_parms (template_parms,
742 DECL_TEMPLATE_PARMS (fndecl)))
743 && (DECL_TEMPLATE_SPECIALIZATION (function)
744 == DECL_TEMPLATE_SPECIALIZATION (fndecl))
745 && (!DECL_TEMPLATE_SPECIALIZATION (function)
746 || (DECL_TI_TEMPLATE (function)
747 == DECL_TI_TEMPLATE (fndecl))))
753 pop_scope (pushed_scope);
754 return OVL_CURRENT (fndecls);
757 error_at (DECL_SOURCE_LOCATION (function),
758 "prototype for %q#D does not match any in class %qT",
760 is_conv_op = DECL_CONV_FN_P (fndecl);
763 ix = CLASSTYPE_FIRST_CONVERSION_SLOT;
764 fndecls = (*methods)[ix];
767 fndecl = OVL_CURRENT (fndecls);
768 fndecls = OVL_NEXT (fndecls);
770 if (!fndecls && is_conv_op)
772 if (methods->length () > (size_t) ++ix)
774 fndecls = (*methods)[ix];
775 if (!DECL_CONV_FN_P (OVL_CURRENT (fndecls)))
787 format = N_("candidates are: %+#D");
789 format = N_("candidate is: %+#D");
790 error (format, fndecl);
793 else if (!COMPLETE_TYPE_P (ctype))
794 cxx_incomplete_type_error (function, ctype);
796 error ("no %q#D member function declared in class %qT",
800 pop_scope (pushed_scope);
801 return error_mark_node;
804 /* DECL is a function with vague linkage. Remember it so that at the
805 end of the translation unit we can decide whether or not to emit
809 note_vague_linkage_fn (tree decl)
811 DECL_DEFER_OUTPUT (decl) = 1;
812 vec_safe_push (deferred_fns, decl);
815 /* As above, but for variable template instantiations. */
818 note_variable_template_instantiation (tree decl)
820 vec_safe_push (pending_statics, decl);
823 /* We have just processed the DECL, which is a static data member.
824 The other parameters are as for cp_finish_decl. */
827 finish_static_data_member_decl (tree decl,
828 tree init, bool init_const_expr_p,
832 DECL_CONTEXT (decl) = current_class_type;
834 /* We cannot call pushdecl here, because that would fill in the
835 TREE_CHAIN of our decl. Instead, we modify cp_finish_decl to do
836 the right thing, namely, to put this decl out straight away. */
838 if (! processing_template_decl)
839 vec_safe_push (pending_statics, decl);
841 if (LOCAL_CLASS_P (current_class_type)
842 /* We already complained about the template definition. */
843 && !DECL_TEMPLATE_INSTANTIATION (decl))
844 permerror (input_location, "local class %q#T shall not have static data member %q#D",
845 current_class_type, decl);
847 for (tree t = current_class_type; TYPE_P (t);
848 t = CP_TYPE_CONTEXT (t))
849 if (TYPE_ANONYMOUS_P (t))
851 if (permerror (DECL_SOURCE_LOCATION (decl),
852 "static data member %qD in unnamed class", decl))
853 inform (DECL_SOURCE_LOCATION (TYPE_NAME (t)),
854 "unnamed class defined here");
858 DECL_IN_AGGR_P (decl) = 1;
860 if (TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE
861 && TYPE_DOMAIN (TREE_TYPE (decl)) == NULL_TREE)
862 SET_VAR_HAD_UNKNOWN_BOUND (decl);
864 cp_finish_decl (decl, init, init_const_expr_p, asmspec_tree, flags);
867 /* DECLARATOR and DECLSPECS correspond to a class member. The other
868 parameters are as for cp_finish_decl. Return the DECL for the
869 class member declared. */
872 grokfield (const cp_declarator *declarator,
873 cp_decl_specifier_seq *declspecs,
874 tree init, bool init_const_expr_p,
879 const char *asmspec = 0;
884 && TREE_CODE (init) == TREE_LIST
885 && TREE_VALUE (init) == error_mark_node
886 && TREE_CHAIN (init) == NULL_TREE)
889 value = grokdeclarator (declarator, declspecs, FIELD, init != 0, &attrlist);
890 if (! value || value == error_mark_node)
891 /* friend or constructor went bad. */
892 return error_mark_node;
893 if (TREE_TYPE (value) == error_mark_node)
896 if (TREE_CODE (value) == TYPE_DECL && init)
898 error ("typedef %qD is initialized (use decltype instead)", value);
902 /* Pass friendly classes back. */
903 if (value == void_type_node)
907 name = DECL_NAME (value);
909 if (name != NULL_TREE)
911 if (TREE_CODE (name) == TEMPLATE_ID_EXPR)
913 error ("explicit template argument list not allowed");
914 return error_mark_node;
917 if (IDENTIFIER_POINTER (name)[0] == '_'
918 && ! strcmp (IDENTIFIER_POINTER (name), "_vptr"))
919 error ("member %qD conflicts with virtual function table field name",
923 /* Stash away type declarations. */
924 if (TREE_CODE (value) == TYPE_DECL)
926 DECL_NONLOCAL (value) = 1;
927 DECL_CONTEXT (value) = current_class_type;
933 /* If this is a typedef that names the class for linkage purposes
934 (7.1.3p8), apply any attributes directly to the type. */
935 if (OVERLOAD_TYPE_P (TREE_TYPE (value))
936 && value == TYPE_NAME (TYPE_MAIN_VARIANT (TREE_TYPE (value))))
937 attrflags = ATTR_FLAG_TYPE_IN_PLACE;
939 cplus_decl_attributes (&value, attrlist, attrflags);
942 if (decl_spec_seq_has_spec_p (declspecs, ds_typedef)
943 && TREE_TYPE (value) != error_mark_node
944 && TYPE_NAME (TYPE_MAIN_VARIANT (TREE_TYPE (value))) != value)
945 set_underlying_type (value);
947 /* It's important that push_template_decl below follows
948 set_underlying_type above so that the created template
949 carries the properly set type of VALUE. */
950 if (processing_template_decl)
951 value = push_template_decl (value);
953 record_locally_defined_typedef (value);
957 int friendp = decl_spec_seq_has_spec_p (declspecs, ds_friend);
959 if (!friendp && DECL_IN_AGGR_P (value))
961 error ("%qD is already defined in %qT", value, DECL_CONTEXT (value));
962 return void_type_node;
965 if (asmspec_tree && asmspec_tree != error_mark_node)
966 asmspec = TREE_STRING_POINTER (asmspec_tree);
970 if (TREE_CODE (value) == FUNCTION_DECL)
972 if (init == ridpointers[(int)RID_DELETE])
974 DECL_DELETED_FN (value) = 1;
975 DECL_DECLARED_INLINE_P (value) = 1;
976 DECL_INITIAL (value) = error_mark_node;
978 else if (init == ridpointers[(int)RID_DEFAULT])
980 if (defaultable_fn_check (value))
982 DECL_DEFAULTED_FN (value) = 1;
983 DECL_INITIALIZED_IN_CLASS_P (value) = 1;
984 DECL_DECLARED_INLINE_P (value) = 1;
987 else if (TREE_CODE (init) == DEFAULT_ARG)
988 error ("invalid initializer for member function %qD", value);
989 else if (TREE_CODE (TREE_TYPE (value)) == METHOD_TYPE)
991 if (integer_zerop (init))
992 DECL_PURE_VIRTUAL_P (value) = 1;
993 else if (error_operand_p (init))
994 ; /* An error has already been reported. */
996 error ("invalid initializer for member function %qD",
1001 gcc_assert (TREE_CODE (TREE_TYPE (value)) == FUNCTION_TYPE);
1003 error ("initializer specified for friend function %qD",
1006 error ("initializer specified for static member function %qD",
1010 else if (TREE_CODE (value) == FIELD_DECL)
1011 /* C++11 NSDMI, keep going. */;
1012 else if (!VAR_P (value))
1016 /* Pass friend decls back. */
1017 if ((TREE_CODE (value) == FUNCTION_DECL
1018 || TREE_CODE (value) == TEMPLATE_DECL)
1019 && DECL_CONTEXT (value) != current_class_type)
1022 /* Need to set this before push_template_decl. */
1023 if (TREE_CODE (value) == VAR_DECL)
1024 DECL_CONTEXT (value) = current_class_type;
1026 if (processing_template_decl && VAR_OR_FUNCTION_DECL_P (value))
1028 value = push_template_decl (value);
1029 if (error_operand_p (value))
1030 return error_mark_node;
1034 cplus_decl_attributes (&value, attrlist, 0);
1036 if (init && DIRECT_LIST_INIT_P (init))
1037 flags = LOOKUP_NORMAL;
1039 flags = LOOKUP_IMPLICIT;
1041 switch (TREE_CODE (value))
1044 finish_static_data_member_decl (value, init, init_const_expr_p,
1045 asmspec_tree, flags);
1050 error ("%<asm%> specifiers are not permitted on non-static data members");
1051 if (DECL_INITIAL (value) == error_mark_node)
1052 init = error_mark_node;
1053 cp_finish_decl (value, init, /*init_const_expr_p=*/false,
1055 DECL_IN_AGGR_P (value) = 1;
1060 set_user_assembler_name (value, asmspec);
1062 cp_finish_decl (value,
1064 /*init_const_expr_p=*/false,
1065 asmspec_tree, flags);
1067 /* Pass friends back this way. */
1068 if (DECL_FRIEND_P (value))
1069 return void_type_node;
1071 DECL_IN_AGGR_P (value) = 1;
1080 /* Like `grokfield', but for bitfields.
1081 WIDTH is non-NULL for bit fields only, and is an INTEGER_CST node. */
1084 grokbitfield (const cp_declarator *declarator,
1085 cp_decl_specifier_seq *declspecs, tree width,
1088 tree value = grokdeclarator (declarator, declspecs, BITFIELD, 0, &attrlist);
1090 if (value == error_mark_node)
1091 return NULL_TREE; /* friends went bad. */
1092 if (TREE_TYPE (value) == error_mark_node)
1095 /* Pass friendly classes back. */
1096 if (VOID_TYPE_P (value))
1097 return void_type_node;
1099 if (!INTEGRAL_OR_ENUMERATION_TYPE_P (TREE_TYPE (value))
1100 && (POINTER_TYPE_P (value)
1101 || !dependent_type_p (TREE_TYPE (value))))
1103 error ("bit-field %qD with non-integral type", value);
1104 return error_mark_node;
1107 if (TREE_CODE (value) == TYPE_DECL)
1109 error ("cannot declare %qD to be a bit-field type", value);
1113 /* Usually, finish_struct_1 catches bitfields with invalid types.
1114 But, in the case of bitfields with function type, we confuse
1115 ourselves into thinking they are member functions, so we must
1117 if (TREE_CODE (value) == FUNCTION_DECL)
1119 error ("cannot declare bit-field %qD with function type",
1124 if (DECL_IN_AGGR_P (value))
1126 error ("%qD is already defined in the class %qT", value,
1127 DECL_CONTEXT (value));
1128 return void_type_node;
1131 if (TREE_STATIC (value))
1133 error ("static member %qD cannot be a bit-field", value);
1136 cp_finish_decl (value, NULL_TREE, false, NULL_TREE, 0);
1138 if (width != error_mark_node)
1140 /* The width must be an integer type. */
1141 if (!type_dependent_expression_p (width)
1142 && !INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (TREE_TYPE (width)))
1143 error ("width of bit-field %qD has non-integral type %qT", value,
1145 DECL_INITIAL (value) = width;
1146 SET_DECL_C_BIT_FIELD (value);
1149 DECL_IN_AGGR_P (value) = 1;
1152 cplus_decl_attributes (&value, attrlist, /*flags=*/0);
1158 /* Returns true iff ATTR is an attribute which needs to be applied at
1159 instantiation time rather than template definition time. */
1162 is_late_template_attribute (tree attr, tree decl)
1164 tree name = get_attribute_name (attr);
1165 tree args = TREE_VALUE (attr);
1166 const struct attribute_spec *spec = lookup_attribute_spec (name);
1170 /* Unknown attribute. */
1173 /* Attribute weak handling wants to write out assembly right away. */
1174 if (is_attribute_p ("weak", name))
1177 /* Attribute unused is applied directly, as it appertains to
1179 if (is_attribute_p ("unused", name))
1182 /* #pragma omp declare simd attribute needs to be always deferred. */
1184 && is_attribute_p ("omp declare simd", name))
1187 /* An attribute pack is clearly dependent. */
1188 if (args && PACK_EXPANSION_P (args))
1191 /* If any of the arguments are dependent expressions, we can't evaluate
1192 the attribute until instantiation time. */
1193 for (arg = args; arg; arg = TREE_CHAIN (arg))
1195 tree t = TREE_VALUE (arg);
1197 /* If the first attribute argument is an identifier, only consider
1198 second and following arguments. Attributes like mode, format,
1199 cleanup and several target specific attributes aren't late
1200 just because they have an IDENTIFIER_NODE as first argument. */
1201 if (arg == args && identifier_p (t))
1204 if (value_dependent_expression_p (t)
1205 || type_dependent_expression_p (t))
1209 if (TREE_CODE (decl) == TYPE_DECL
1211 || spec->type_required)
1213 tree type = TYPE_P (decl) ? decl : TREE_TYPE (decl);
1215 /* We can't apply any attributes to a completely unknown type until
1216 instantiation time. */
1217 enum tree_code code = TREE_CODE (type);
1218 if (code == TEMPLATE_TYPE_PARM
1219 || code == BOUND_TEMPLATE_TEMPLATE_PARM
1220 || code == TYPENAME_TYPE)
1222 /* Also defer most attributes on dependent types. This is not
1223 necessary in all cases, but is the better default. */
1224 else if (dependent_type_p (type)
1225 /* But some attributes specifically apply to templates. */
1226 && !is_attribute_p ("abi_tag", name)
1227 && !is_attribute_p ("deprecated", name)
1228 && !is_attribute_p ("visibility", name))
1237 /* ATTR_P is a list of attributes. Remove any attributes which need to be
1238 applied at instantiation time and return them. If IS_DEPENDENT is true,
1239 the declaration itself is dependent, so all attributes should be applied
1240 at instantiation time. */
1243 splice_template_attributes (tree *attr_p, tree decl)
1246 tree late_attrs = NULL_TREE;
1247 tree *q = &late_attrs;
1254 if (is_late_template_attribute (*p, decl))
1256 ATTR_IS_DEPENDENT (*p) = 1;
1258 *p = TREE_CHAIN (*p);
1259 q = &TREE_CHAIN (*q);
1263 p = &TREE_CHAIN (*p);
1269 /* Remove any late attributes from the list in ATTR_P and attach them to
1273 save_template_attributes (tree *attr_p, tree *decl_p)
1277 if (attr_p && *attr_p == error_mark_node)
1280 tree late_attrs = splice_template_attributes (attr_p, *decl_p);
1284 if (DECL_P (*decl_p))
1285 q = &DECL_ATTRIBUTES (*decl_p);
1287 q = &TYPE_ATTRIBUTES (*decl_p);
1289 tree old_attrs = *q;
1291 /* Merge the late attributes at the beginning with the attribute
1293 late_attrs = merge_attributes (late_attrs, *q);
1296 if (!DECL_P (*decl_p) && *decl_p == TYPE_MAIN_VARIANT (*decl_p))
1298 /* We've added new attributes directly to the main variant, so
1299 now we need to update all of the other variants to include
1300 these new attributes. */
1302 for (variant = TYPE_NEXT_VARIANT (*decl_p); variant;
1303 variant = TYPE_NEXT_VARIANT (variant))
1305 gcc_assert (TYPE_ATTRIBUTES (variant) == old_attrs);
1306 TYPE_ATTRIBUTES (variant) = TYPE_ATTRIBUTES (*decl_p);
1311 /* Return true iff ATTRS are acceptable attributes to be applied in-place
1312 to a typedef which gives a previously anonymous class or enum a name for
1313 linkage purposes. */
1316 attributes_naming_typedef_ok (tree attrs)
1318 for (; attrs; attrs = TREE_CHAIN (attrs))
1320 tree name = get_attribute_name (attrs);
1321 if (is_attribute_p ("vector_size", name))
1327 /* Like reconstruct_complex_type, but handle also template trees. */
1330 cp_reconstruct_complex_type (tree type, tree bottom)
1333 bool late_return_type_p = false;
1335 if (TYPE_PTR_P (type))
1337 inner = cp_reconstruct_complex_type (TREE_TYPE (type), bottom);
1338 outer = build_pointer_type_for_mode (inner, TYPE_MODE (type),
1339 TYPE_REF_CAN_ALIAS_ALL (type));
1341 else if (TREE_CODE (type) == REFERENCE_TYPE)
1343 inner = cp_reconstruct_complex_type (TREE_TYPE (type), bottom);
1344 outer = build_reference_type_for_mode (inner, TYPE_MODE (type),
1345 TYPE_REF_CAN_ALIAS_ALL (type));
1347 else if (TREE_CODE (type) == ARRAY_TYPE)
1349 inner = cp_reconstruct_complex_type (TREE_TYPE (type), bottom);
1350 outer = build_cplus_array_type (inner, TYPE_DOMAIN (type));
1351 /* Don't call cp_build_qualified_type on ARRAY_TYPEs, the
1352 element type qualification will be handled by the recursive
1353 cp_reconstruct_complex_type call and cp_build_qualified_type
1354 for ARRAY_TYPEs changes the element type. */
1357 else if (TREE_CODE (type) == FUNCTION_TYPE)
1359 late_return_type_p = TYPE_HAS_LATE_RETURN_TYPE (type);
1360 inner = cp_reconstruct_complex_type (TREE_TYPE (type), bottom);
1361 outer = build_function_type (inner, TYPE_ARG_TYPES (type));
1362 outer = apply_memfn_quals (outer,
1363 type_memfn_quals (type),
1364 type_memfn_rqual (type));
1366 else if (TREE_CODE (type) == METHOD_TYPE)
1368 late_return_type_p = TYPE_HAS_LATE_RETURN_TYPE (type);
1369 inner = cp_reconstruct_complex_type (TREE_TYPE (type), bottom);
1370 /* The build_method_type_directly() routine prepends 'this' to argument list,
1371 so we must compensate by getting rid of it. */
1373 = build_method_type_directly
1374 (class_of_this_parm (type), inner,
1375 TREE_CHAIN (TYPE_ARG_TYPES (type)));
1377 else if (TREE_CODE (type) == OFFSET_TYPE)
1379 inner = cp_reconstruct_complex_type (TREE_TYPE (type), bottom);
1380 outer = build_offset_type (TYPE_OFFSET_BASETYPE (type), inner);
1385 if (TYPE_ATTRIBUTES (type))
1386 outer = cp_build_type_attribute_variant (outer, TYPE_ATTRIBUTES (type));
1387 outer = cp_build_qualified_type (outer, cp_type_quals (type));
1389 if (late_return_type_p)
1390 TYPE_HAS_LATE_RETURN_TYPE (outer) = 1;
1395 /* Replaces any constexpr expression that may be into the attributes
1396 arguments with their reduced value. */
1399 cp_check_const_attributes (tree attributes)
1401 if (attributes == error_mark_node)
1405 for (attr = attributes; attr; attr = TREE_CHAIN (attr))
1408 for (arg = TREE_VALUE (attr); arg; arg = TREE_CHAIN (arg))
1410 tree expr = TREE_VALUE (arg);
1412 TREE_VALUE (arg) = maybe_constant_value (expr);
1417 /* Return true if TYPE is an OpenMP mappable type. */
1419 cp_omp_mappable_type (tree type)
1421 /* Mappable type has to be complete. */
1422 if (type == error_mark_node || !COMPLETE_TYPE_P (type))
1424 /* Arrays have mappable type if the elements have mappable type. */
1425 while (TREE_CODE (type) == ARRAY_TYPE)
1426 type = TREE_TYPE (type);
1427 /* A mappable type cannot contain virtual members. */
1428 if (CLASS_TYPE_P (type) && CLASSTYPE_VTABLES (type))
1430 /* All data members must be non-static. */
1431 if (CLASS_TYPE_P (type))
1434 for (field = TYPE_FIELDS (type); field; field = DECL_CHAIN (field))
1435 if (TREE_CODE (field) == VAR_DECL)
1437 /* All fields must have mappable types. */
1438 else if (TREE_CODE (field) == FIELD_DECL
1439 && !cp_omp_mappable_type (TREE_TYPE (field)))
1445 /* Like decl_attributes, but handle C++ complexity. */
1448 cplus_decl_attributes (tree *decl, tree attributes, int flags)
1450 if (*decl == NULL_TREE || *decl == void_type_node
1451 || *decl == error_mark_node)
1454 /* Add implicit "omp declare target" attribute if requested. */
1455 if (scope_chain->omp_declare_target_attribute
1456 && ((TREE_CODE (*decl) == VAR_DECL
1457 && (TREE_STATIC (*decl) || DECL_EXTERNAL (*decl)))
1458 || TREE_CODE (*decl) == FUNCTION_DECL))
1460 if (TREE_CODE (*decl) == VAR_DECL
1461 && DECL_CLASS_SCOPE_P (*decl))
1462 error ("%q+D static data member inside of declare target directive",
1464 else if (TREE_CODE (*decl) == VAR_DECL
1465 && (DECL_FUNCTION_SCOPE_P (*decl)
1466 || (current_function_decl && !DECL_EXTERNAL (*decl))))
1467 error ("%q+D in block scope inside of declare target directive",
1469 else if (!processing_template_decl
1470 && TREE_CODE (*decl) == VAR_DECL
1471 && !cp_omp_mappable_type (TREE_TYPE (*decl)))
1472 error ("%q+D in declare target directive does not have mappable type",
1475 attributes = tree_cons (get_identifier ("omp declare target"),
1476 NULL_TREE, attributes);
1479 if (processing_template_decl)
1481 if (check_for_bare_parameter_packs (attributes))
1484 save_template_attributes (&attributes, decl);
1487 cp_check_const_attributes (attributes);
1489 if (TREE_CODE (*decl) == TEMPLATE_DECL)
1490 decl = &DECL_TEMPLATE_RESULT (*decl);
1492 if (TREE_TYPE (*decl) && TYPE_PTRMEMFUNC_P (TREE_TYPE (*decl)))
1495 = decl_attributes (decl, attributes, flags | ATTR_FLAG_FUNCTION_NEXT);
1496 decl_attributes (&TYPE_PTRMEMFUNC_FN_TYPE_RAW (TREE_TYPE (*decl)),
1500 decl_attributes (decl, attributes, flags);
1502 if (TREE_CODE (*decl) == TYPE_DECL)
1503 SET_IDENTIFIER_TYPE_VALUE (DECL_NAME (*decl), TREE_TYPE (*decl));
1505 /* Propagate deprecation out to the template. */
1506 if (TREE_DEPRECATED (*decl))
1507 if (tree ti = get_template_info (*decl))
1509 tree tmpl = TI_TEMPLATE (ti);
1510 tree pattern = (TYPE_P (*decl) ? TREE_TYPE (tmpl)
1511 : DECL_TEMPLATE_RESULT (tmpl));
1512 if (*decl == pattern)
1513 TREE_DEPRECATED (tmpl) = true;
1517 /* Walks through the namespace- or function-scope anonymous union
1518 OBJECT, with the indicated TYPE, building appropriate VAR_DECLs.
1519 Returns one of the fields for use in the mangled name. */
1522 build_anon_union_vars (tree type, tree object)
1524 tree main_decl = NULL_TREE;
1527 /* Rather than write the code to handle the non-union case,
1528 just give an error. */
1529 if (TREE_CODE (type) != UNION_TYPE)
1531 error ("anonymous struct not inside named type");
1532 return error_mark_node;
1535 for (field = TYPE_FIELDS (type);
1537 field = DECL_CHAIN (field))
1542 if (DECL_ARTIFICIAL (field))
1544 if (TREE_CODE (field) != FIELD_DECL)
1546 permerror (input_location, "%q+#D invalid; an anonymous union can only "
1547 "have non-static data members", field);
1551 if (TREE_PRIVATE (field))
1552 permerror (input_location, "private member %q+#D in anonymous union", field);
1553 else if (TREE_PROTECTED (field))
1554 permerror (input_location, "protected member %q+#D in anonymous union", field);
1556 if (processing_template_decl)
1557 ref = build_min_nt_loc (UNKNOWN_LOCATION, COMPONENT_REF, object,
1558 DECL_NAME (field), NULL_TREE);
1560 ref = build_class_member_access_expr (object, field, NULL_TREE,
1561 false, tf_warning_or_error);
1563 if (DECL_NAME (field))
1567 decl = build_decl (input_location,
1568 VAR_DECL, DECL_NAME (field), TREE_TYPE (field));
1569 DECL_ANON_UNION_VAR_P (decl) = 1;
1570 DECL_ARTIFICIAL (decl) = 1;
1572 base = get_base_address (object);
1573 TREE_PUBLIC (decl) = TREE_PUBLIC (base);
1574 TREE_STATIC (decl) = TREE_STATIC (base);
1575 DECL_EXTERNAL (decl) = DECL_EXTERNAL (base);
1577 SET_DECL_VALUE_EXPR (decl, ref);
1578 DECL_HAS_VALUE_EXPR_P (decl) = 1;
1580 decl = pushdecl (decl);
1582 else if (ANON_AGGR_TYPE_P (TREE_TYPE (field)))
1583 decl = build_anon_union_vars (TREE_TYPE (field), ref);
1587 if (main_decl == NULL_TREE)
1594 /* Finish off the processing of a UNION_TYPE structure. If the union is an
1595 anonymous union, then all members must be laid out together. PUBLIC_P
1596 is nonzero if this union is not declared static. */
1599 finish_anon_union (tree anon_union_decl)
1605 if (anon_union_decl == error_mark_node)
1608 type = TREE_TYPE (anon_union_decl);
1609 public_p = TREE_PUBLIC (anon_union_decl);
1611 /* The VAR_DECL's context is the same as the TYPE's context. */
1612 DECL_CONTEXT (anon_union_decl) = DECL_CONTEXT (TYPE_NAME (type));
1614 if (TYPE_FIELDS (type) == NULL_TREE)
1619 error ("namespace-scope anonymous aggregates must be static");
1623 main_decl = build_anon_union_vars (type, anon_union_decl);
1624 if (main_decl == error_mark_node)
1626 if (main_decl == NULL_TREE)
1628 warning (0, "anonymous union with no members");
1632 if (!processing_template_decl)
1634 /* Use main_decl to set the mangled name. */
1635 DECL_NAME (anon_union_decl) = DECL_NAME (main_decl);
1636 maybe_commonize_var (anon_union_decl);
1637 if (TREE_STATIC (anon_union_decl) || DECL_EXTERNAL (anon_union_decl))
1638 mangle_decl (anon_union_decl);
1639 DECL_NAME (anon_union_decl) = NULL_TREE;
1642 pushdecl (anon_union_decl);
1643 cp_finish_decl (anon_union_decl, NULL_TREE, false, NULL_TREE, 0);
1646 /* Auxiliary functions to make type signatures for
1647 `operator new' and `operator delete' correspond to
1648 what compiler will be expecting. */
1651 coerce_new_type (tree type)
1654 tree args = TYPE_ARG_TYPES (type);
1656 gcc_assert (TREE_CODE (type) == FUNCTION_TYPE);
1658 if (!same_type_p (TREE_TYPE (type), ptr_type_node))
1661 error ("%<operator new%> must return type %qT", ptr_type_node);
1664 if (args && args != void_list_node)
1666 if (TREE_PURPOSE (args))
1668 /* [basic.stc.dynamic.allocation]
1670 The first parameter shall not have an associated default
1672 error ("the first parameter of %<operator new%> cannot "
1673 "have a default argument");
1674 /* Throw away the default argument. */
1675 TREE_PURPOSE (args) = NULL_TREE;
1678 if (!same_type_p (TREE_VALUE (args), size_type_node))
1681 args = TREE_CHAIN (args);
1688 permerror (input_location, "%<operator new%> takes type %<size_t%> (%qT) "
1689 "as first parameter", size_type_node);
1694 args = tree_cons (NULL_TREE, size_type_node, args);
1697 type = build_exception_variant
1698 (build_function_type (ptr_type_node, args),
1699 TYPE_RAISES_EXCEPTIONS (type));
1707 coerce_delete_type (tree type)
1710 tree args = TYPE_ARG_TYPES (type);
1712 gcc_assert (TREE_CODE (type) == FUNCTION_TYPE);
1714 if (!same_type_p (TREE_TYPE (type), void_type_node))
1717 error ("%<operator delete%> must return type %qT", void_type_node);
1720 if (!args || args == void_list_node
1721 || !same_type_p (TREE_VALUE (args), ptr_type_node))
1724 if (args && args != void_list_node)
1725 args = TREE_CHAIN (args);
1726 error ("%<operator delete%> takes type %qT as first parameter",
1732 args = tree_cons (NULL_TREE, ptr_type_node, args);
1735 type = build_exception_variant
1736 (build_function_type (void_type_node, args),
1737 TYPE_RAISES_EXCEPTIONS (type));
1745 /* DECL is a VAR_DECL for a vtable: walk through the entries in the vtable
1746 and mark them as needed. */
1749 mark_vtable_entries (tree decl)
1752 unsigned HOST_WIDE_INT idx;
1754 /* It's OK for the vtable to refer to deprecated virtual functions. */
1755 warning_sentinel w(warn_deprecated_decl);
1757 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (DECL_INITIAL (decl)),
1762 STRIP_NOPS (fnaddr);
1764 if (TREE_CODE (fnaddr) != ADDR_EXPR
1765 && TREE_CODE (fnaddr) != FDESC_EXPR)
1766 /* This entry is an offset: a virtual base class offset, a
1767 virtual call offset, an RTTI offset, etc. */
1770 fn = TREE_OPERAND (fnaddr, 0);
1771 TREE_ADDRESSABLE (fn) = 1;
1772 /* When we don't have vcall offsets, we output thunks whenever
1773 we output the vtables that contain them. With vcall offsets,
1774 we know all the thunks we'll need when we emit a virtual
1775 function, so we emit the thunks there instead. */
1776 if (DECL_THUNK_P (fn))
1777 use_thunk (fn, /*emit_p=*/0);
1782 /* Set DECL up to have the closest approximation of "initialized common"
1783 linkage available. */
1786 comdat_linkage (tree decl)
1789 make_decl_one_only (decl, cxx_comdat_group (decl));
1790 else if (TREE_CODE (decl) == FUNCTION_DECL
1791 || (VAR_P (decl) && DECL_ARTIFICIAL (decl)))
1792 /* We can just emit function and compiler-generated variables
1793 statically; having multiple copies is (for the most part) only
1796 There are two correctness issues, however: the address of a
1797 template instantiation with external linkage should be the
1798 same, independent of what translation unit asks for the
1799 address, and this will not hold when we emit multiple copies of
1800 the function. However, there's little else we can do.
1802 Also, by default, the typeinfo implementation assumes that
1803 there will be only one copy of the string used as the name for
1804 each type. Therefore, if weak symbols are unavailable, the
1805 run-time library should perform a more conservative check; it
1806 should perform a string comparison, rather than an address
1808 TREE_PUBLIC (decl) = 0;
1811 /* Static data member template instantiations, however, cannot
1812 have multiple copies. */
1813 if (DECL_INITIAL (decl) == 0
1814 || DECL_INITIAL (decl) == error_mark_node)
1815 DECL_COMMON (decl) = 1;
1816 else if (EMPTY_CONSTRUCTOR_P (DECL_INITIAL (decl)))
1818 DECL_COMMON (decl) = 1;
1819 DECL_INITIAL (decl) = error_mark_node;
1821 else if (!DECL_EXPLICIT_INSTANTIATION (decl))
1823 /* We can't do anything useful; leave vars for explicit
1825 DECL_EXTERNAL (decl) = 1;
1826 DECL_NOT_REALLY_EXTERN (decl) = 0;
1830 DECL_COMDAT (decl) = 1;
1833 /* For win32 we also want to put explicit instantiations in
1834 linkonce sections, so that they will be merged with implicit
1835 instantiations; otherwise we get duplicate symbol errors.
1836 For Darwin we do not want explicit instantiations to be
1840 maybe_make_one_only (tree decl)
1842 /* We used to say that this was not necessary on targets that support weak
1843 symbols, because the implicit instantiations will defer to the explicit
1844 one. However, that's not actually the case in SVR4; a strong definition
1845 after a weak one is an error. Also, not making explicit
1846 instantiations one_only means that we can end up with two copies of
1847 some template instantiations. */
1851 /* We can't set DECL_COMDAT on functions, or cp_finish_file will think
1852 we can get away with not emitting them if they aren't used. We need
1853 to for variables so that cp_finish_decl will update their linkage,
1854 because their DECL_INITIAL may not have been set properly yet. */
1856 if (!TARGET_WEAK_NOT_IN_ARCHIVE_TOC
1857 || (! DECL_EXPLICIT_INSTANTIATION (decl)
1858 && ! DECL_TEMPLATE_SPECIALIZATION (decl)))
1860 make_decl_one_only (decl, cxx_comdat_group (decl));
1864 varpool_node *node = varpool_node::get_create (decl);
1865 DECL_COMDAT (decl) = 1;
1866 /* Mark it needed so we don't forget to emit it. */
1867 node->forced_by_abi = true;
1868 TREE_USED (decl) = 1;
1873 /* Returns true iff DECL, a FUNCTION_DECL or VAR_DECL, has vague linkage.
1874 This predicate will give the right answer during parsing of the
1875 function, which other tests may not. */
1878 vague_linkage_p (tree decl)
1880 /* Unfortunately, import_export_decl has not always been called
1881 before the function is processed, so we cannot simply check
1883 if (DECL_COMDAT (decl)
1884 || (((TREE_CODE (decl) == FUNCTION_DECL
1885 && DECL_DECLARED_INLINE_P (decl))
1886 || (DECL_LANG_SPECIFIC (decl)
1887 && DECL_TEMPLATE_INSTANTIATION (decl)))
1888 && TREE_PUBLIC (decl)))
1890 else if (DECL_FUNCTION_SCOPE_P (decl))
1891 /* A local static in an inline effectively has vague linkage. */
1892 return (TREE_STATIC (decl)
1893 && vague_linkage_p (DECL_CONTEXT (decl)));
1898 /* Determine whether or not we want to specifically import or export CTYPE,
1899 using various heuristics. */
1902 import_export_class (tree ctype)
1904 /* -1 for imported, 1 for exported. */
1905 int import_export = 0;
1907 /* It only makes sense to call this function at EOF. The reason is
1908 that this function looks at whether or not the first non-inline
1909 non-abstract virtual member function has been defined in this
1910 translation unit. But, we can't possibly know that until we've
1911 seen the entire translation unit. */
1912 gcc_assert (at_eof);
1914 if (CLASSTYPE_INTERFACE_KNOWN (ctype))
1917 /* If MULTIPLE_SYMBOL_SPACES is set and we saw a #pragma interface,
1918 we will have CLASSTYPE_INTERFACE_ONLY set but not
1919 CLASSTYPE_INTERFACE_KNOWN. In that case, we don't want to use this
1920 heuristic because someone will supply a #pragma implementation
1921 elsewhere, and deducing it here would produce a conflict. */
1922 if (CLASSTYPE_INTERFACE_ONLY (ctype))
1925 if (lookup_attribute ("dllimport", TYPE_ATTRIBUTES (ctype)))
1927 else if (lookup_attribute ("dllexport", TYPE_ATTRIBUTES (ctype)))
1929 else if (CLASSTYPE_IMPLICIT_INSTANTIATION (ctype)
1930 && !flag_implicit_templates)
1931 /* For a template class, without -fimplicit-templates, check the
1932 repository. If the virtual table is assigned to this
1933 translation unit, then export the class; otherwise, import
1935 import_export = repo_export_class_p (ctype) ? 1 : -1;
1936 else if (TYPE_POLYMORPHIC_P (ctype))
1938 /* The ABI specifies that the virtual table and associated
1939 information are emitted with the key method, if any. */
1940 tree method = CLASSTYPE_KEY_METHOD (ctype);
1941 /* If weak symbol support is not available, then we must be
1942 careful not to emit the vtable when the key function is
1943 inline. An inline function can be defined in multiple
1944 translation units. If we were to emit the vtable in each
1945 translation unit containing a definition, we would get
1946 multiple definition errors at link-time. */
1947 if (method && (flag_weak || ! DECL_DECLARED_INLINE_P (method)))
1948 import_export = (DECL_REALLY_EXTERN (method) ? -1 : 1);
1951 /* When MULTIPLE_SYMBOL_SPACES is set, we cannot count on seeing
1952 a definition anywhere else. */
1953 if (MULTIPLE_SYMBOL_SPACES && import_export == -1)
1956 /* Allow back ends the chance to overrule the decision. */
1957 if (targetm.cxx.import_export_class)
1958 import_export = targetm.cxx.import_export_class (ctype, import_export);
1962 SET_CLASSTYPE_INTERFACE_KNOWN (ctype);
1963 CLASSTYPE_INTERFACE_ONLY (ctype) = (import_export < 0);
1967 /* Return true if VAR has already been provided to the back end; in that
1968 case VAR should not be modified further by the front end. */
1970 var_finalized_p (tree var)
1972 return varpool_node::get_create (var)->definition;
1975 /* DECL is a VAR_DECL or FUNCTION_DECL which, for whatever reason,
1976 must be emitted in this translation unit. Mark it as such. */
1979 mark_needed (tree decl)
1981 TREE_USED (decl) = 1;
1982 if (TREE_CODE (decl) == FUNCTION_DECL)
1984 /* Extern inline functions don't become needed when referenced.
1985 If we know a method will be emitted in other TU and no new
1986 functions can be marked reachable, just use the external
1988 struct cgraph_node *node = cgraph_node::get_create (decl);
1989 node->forced_by_abi = true;
1991 /* #pragma interface and -frepo code can call mark_needed for
1992 maybe-in-charge 'tors; mark the clones as well. */
1994 FOR_EACH_CLONE (clone, decl)
1995 mark_needed (clone);
1997 else if (TREE_CODE (decl) == VAR_DECL)
1999 varpool_node *node = varpool_node::get_create (decl);
2000 /* C++ frontend use mark_decl_references to force COMDAT variables
2001 to be output that might appear dead otherwise. */
2002 node->forced_by_abi = true;
2006 /* DECL is either a FUNCTION_DECL or a VAR_DECL. This function
2007 returns true if a definition of this entity should be provided in
2008 this object file. Callers use this function to determine whether
2009 or not to let the back end know that a definition of DECL is
2010 available in this translation unit. */
2013 decl_needed_p (tree decl)
2015 gcc_assert (VAR_OR_FUNCTION_DECL_P (decl));
2016 /* This function should only be called at the end of the translation
2017 unit. We cannot be sure of whether or not something will be
2018 COMDAT until that point. */
2019 gcc_assert (at_eof);
2021 /* All entities with external linkage that are not COMDAT/EXTERN should be
2022 emitted; they may be referred to from other object files. */
2023 if (TREE_PUBLIC (decl) && !DECL_COMDAT (decl) && !DECL_REALLY_EXTERN (decl))
2025 /* Functions marked "dllexport" must be emitted so that they are
2026 visible to other DLLs. */
2027 if (flag_keep_inline_dllexport
2028 && lookup_attribute ("dllexport", DECL_ATTRIBUTES (decl)))
2031 /* When not optimizing, do not bother to produce definitions for extern
2033 if (DECL_REALLY_EXTERN (decl)
2034 && ((TREE_CODE (decl) != FUNCTION_DECL
2036 || (TREE_CODE (decl) == FUNCTION_DECL
2037 && !opt_for_fn (decl, optimize)))
2038 && !lookup_attribute ("always_inline", decl))
2041 /* If this entity was used, let the back end see it; it will decide
2042 whether or not to emit it into the object file. */
2043 if (TREE_USED (decl))
2045 /* Virtual functions might be needed for devirtualization. */
2046 if (flag_devirtualize
2047 && TREE_CODE (decl) == FUNCTION_DECL
2048 && DECL_VIRTUAL_P (decl))
2050 /* Otherwise, DECL does not need to be emitted -- yet. A subsequent
2051 reference to DECL might cause it to be emitted later. */
2055 /* If necessary, write out the vtables for the dynamic class CTYPE.
2056 Returns true if any vtables were emitted. */
2059 maybe_emit_vtables (tree ctype)
2064 varpool_node *current = NULL, *last = NULL;
2066 /* If the vtables for this class have already been emitted there is
2067 nothing more to do. */
2068 primary_vtbl = CLASSTYPE_VTABLES (ctype);
2069 if (var_finalized_p (primary_vtbl))
2071 /* Ignore dummy vtables made by get_vtable_decl. */
2072 if (TREE_TYPE (primary_vtbl) == void_type_node)
2075 /* On some targets, we cannot determine the key method until the end
2076 of the translation unit -- which is when this function is
2078 if (!targetm.cxx.key_method_may_be_inline ())
2079 determine_key_method (ctype);
2081 /* See if any of the vtables are needed. */
2082 for (vtbl = CLASSTYPE_VTABLES (ctype); vtbl; vtbl = DECL_CHAIN (vtbl))
2084 import_export_decl (vtbl);
2085 if (DECL_NOT_REALLY_EXTERN (vtbl) && decl_needed_p (vtbl))
2090 /* If the references to this class' vtables are optimized away,
2091 still emit the appropriate debugging information. See
2093 if (DECL_COMDAT (primary_vtbl)
2094 && CLASSTYPE_DEBUG_REQUESTED (ctype))
2095 note_debug_info_needed (ctype);
2099 /* The ABI requires that we emit all of the vtables if we emit any
2101 for (vtbl = CLASSTYPE_VTABLES (ctype); vtbl; vtbl = DECL_CHAIN (vtbl))
2103 /* Mark entities references from the virtual table as used. */
2104 mark_vtable_entries (vtbl);
2106 if (TREE_TYPE (DECL_INITIAL (vtbl)) == 0)
2108 vec<tree, va_gc> *cleanups = NULL;
2109 tree expr = store_init_value (vtbl, DECL_INITIAL (vtbl), &cleanups,
2112 /* It had better be all done at compile-time. */
2113 gcc_assert (!expr && !cleanups);
2117 DECL_EXTERNAL (vtbl) = 0;
2118 rest_of_decl_compilation (vtbl, 1, 1);
2120 /* Because we're only doing syntax-checking, we'll never end up
2121 actually marking the variable as written. */
2122 if (flag_syntax_only)
2123 TREE_ASM_WRITTEN (vtbl) = 1;
2124 else if (DECL_ONE_ONLY (vtbl))
2126 current = varpool_node::get_create (vtbl);
2128 current->add_to_same_comdat_group (last);
2133 /* Since we're writing out the vtable here, also write the debug
2135 note_debug_info_needed (ctype);
2140 /* A special return value from type_visibility meaning internal
2143 enum { VISIBILITY_ANON = VISIBILITY_INTERNAL+1 };
2145 /* walk_tree helper function for type_visibility. */
2148 min_vis_r (tree *tp, int *walk_subtrees, void *data)
2150 int *vis_p = (int *)data;
2155 else if (OVERLOAD_TYPE_P (*tp)
2156 && !TREE_PUBLIC (TYPE_MAIN_DECL (*tp)))
2158 *vis_p = VISIBILITY_ANON;
2161 else if (CLASS_TYPE_P (*tp)
2162 && CLASSTYPE_VISIBILITY (*tp) > *vis_p)
2163 *vis_p = CLASSTYPE_VISIBILITY (*tp);
2167 /* Returns the visibility of TYPE, which is the minimum visibility of its
2171 type_visibility (tree type)
2173 int vis = VISIBILITY_DEFAULT;
2174 cp_walk_tree_without_duplicates (&type, min_vis_r, &vis);
2178 /* Limit the visibility of DECL to VISIBILITY, if not explicitly
2179 specified (or if VISIBILITY is static). If TMPL is true, this
2180 constraint is for a template argument, and takes precedence
2181 over explicitly-specified visibility on the template. */
2184 constrain_visibility (tree decl, int visibility, bool tmpl)
2186 if (visibility == VISIBILITY_ANON)
2188 /* extern "C" declarations aren't affected by the anonymous
2190 if (!DECL_EXTERN_C_P (decl))
2192 TREE_PUBLIC (decl) = 0;
2193 DECL_WEAK (decl) = 0;
2194 DECL_COMMON (decl) = 0;
2195 DECL_COMDAT (decl) = false;
2196 if (TREE_CODE (decl) == FUNCTION_DECL
2197 || TREE_CODE (decl) == VAR_DECL)
2199 struct symtab_node *snode = symtab_node::get (decl);
2202 snode->set_comdat_group (NULL);
2204 DECL_INTERFACE_KNOWN (decl) = 1;
2205 if (DECL_LANG_SPECIFIC (decl))
2206 DECL_NOT_REALLY_EXTERN (decl) = 1;
2209 else if (visibility > DECL_VISIBILITY (decl)
2210 && (tmpl || !DECL_VISIBILITY_SPECIFIED (decl)))
2212 DECL_VISIBILITY (decl) = (enum symbol_visibility) visibility;
2213 /* This visibility was not specified. */
2214 DECL_VISIBILITY_SPECIFIED (decl) = false;
2218 /* Constrain the visibility of DECL based on the visibility of its template
2222 constrain_visibility_for_template (tree decl, tree targs)
2224 /* If this is a template instantiation, check the innermost
2225 template args for visibility constraints. The outer template
2226 args are covered by the class check. */
2227 tree args = INNERMOST_TEMPLATE_ARGS (targs);
2229 for (i = TREE_VEC_LENGTH (args); i > 0; --i)
2233 tree arg = TREE_VEC_ELT (args, i-1);
2235 vis = type_visibility (arg);
2238 if (REFERENCE_REF_P (arg))
2239 arg = TREE_OPERAND (arg, 0);
2240 if (TREE_TYPE (arg))
2242 if (TREE_CODE (arg) == ADDR_EXPR)
2243 arg = TREE_OPERAND (arg, 0);
2244 if (VAR_OR_FUNCTION_DECL_P (arg))
2246 if (! TREE_PUBLIC (arg))
2247 vis = VISIBILITY_ANON;
2249 vis = DECL_VISIBILITY (arg);
2253 constrain_visibility (decl, vis, true);
2257 /* Like c_determine_visibility, but with additional C++-specific
2260 Function-scope entities can rely on the function's visibility because
2261 it is set in start_preparsed_function.
2263 Class-scope entities cannot rely on the class's visibility until the end
2264 of the enclosing class definition.
2266 Note that because namespaces have multiple independent definitions,
2267 namespace visibility is handled elsewhere using the #pragma visibility
2268 machinery rather than by decorating the namespace declaration.
2270 The goal is for constraints from the type to give a diagnostic, and
2271 other constraints to be applied silently. */
2274 determine_visibility (tree decl)
2276 tree class_type = NULL_TREE;
2278 bool orig_visibility_specified;
2279 enum symbol_visibility orig_visibility;
2281 /* Remember that all decls get VISIBILITY_DEFAULT when built. */
2283 /* Only relevant for names with external linkage. */
2284 if (!TREE_PUBLIC (decl))
2287 /* Cloned constructors and destructors get the same visibility as
2288 the underlying function. That should be set up in
2289 maybe_clone_body. */
2290 gcc_assert (!DECL_CLONED_FUNCTION_P (decl));
2292 orig_visibility_specified = DECL_VISIBILITY_SPECIFIED (decl);
2293 orig_visibility = DECL_VISIBILITY (decl);
2295 if (TREE_CODE (decl) == TYPE_DECL)
2297 if (CLASS_TYPE_P (TREE_TYPE (decl)))
2298 use_template = CLASSTYPE_USE_TEMPLATE (TREE_TYPE (decl));
2299 else if (TYPE_TEMPLATE_INFO (TREE_TYPE (decl)))
2304 else if (DECL_LANG_SPECIFIC (decl))
2305 use_template = DECL_USE_TEMPLATE (decl);
2309 /* If DECL is a member of a class, visibility specifiers on the
2310 class can influence the visibility of the DECL. */
2311 if (DECL_CLASS_SCOPE_P (decl))
2312 class_type = DECL_CONTEXT (decl);
2315 /* Not a class member. */
2317 /* Virtual tables have DECL_CONTEXT set to their associated class,
2318 so they are automatically handled above. */
2319 gcc_assert (!VAR_P (decl)
2320 || !DECL_VTABLE_OR_VTT_P (decl));
2322 if (DECL_FUNCTION_SCOPE_P (decl) && ! DECL_VISIBILITY_SPECIFIED (decl))
2324 /* Local statics and classes get the visibility of their
2325 containing function by default, except that
2326 -fvisibility-inlines-hidden doesn't affect them. */
2327 tree fn = DECL_CONTEXT (decl);
2328 if (DECL_VISIBILITY_SPECIFIED (fn))
2330 DECL_VISIBILITY (decl) = DECL_VISIBILITY (fn);
2331 DECL_VISIBILITY_SPECIFIED (decl) =
2332 DECL_VISIBILITY_SPECIFIED (fn);
2336 if (DECL_CLASS_SCOPE_P (fn))
2337 determine_visibility_from_class (decl, DECL_CONTEXT (fn));
2338 else if (determine_hidden_inline (fn))
2340 DECL_VISIBILITY (decl) = default_visibility;
2341 DECL_VISIBILITY_SPECIFIED (decl) =
2342 visibility_options.inpragma;
2346 DECL_VISIBILITY (decl) = DECL_VISIBILITY (fn);
2347 DECL_VISIBILITY_SPECIFIED (decl) =
2348 DECL_VISIBILITY_SPECIFIED (fn);
2352 /* Local classes in templates have CLASSTYPE_USE_TEMPLATE set,
2353 but have no TEMPLATE_INFO, so don't try to check it. */
2356 else if (VAR_P (decl) && DECL_TINFO_P (decl)
2357 && flag_visibility_ms_compat)
2359 /* Under -fvisibility-ms-compat, types are visible by default,
2360 even though their contents aren't. */
2361 tree underlying_type = TREE_TYPE (DECL_NAME (decl));
2362 int underlying_vis = type_visibility (underlying_type);
2363 if (underlying_vis == VISIBILITY_ANON
2364 || (CLASS_TYPE_P (underlying_type)
2365 && CLASSTYPE_VISIBILITY_SPECIFIED (underlying_type)))
2366 constrain_visibility (decl, underlying_vis, false);
2368 DECL_VISIBILITY (decl) = VISIBILITY_DEFAULT;
2370 else if (VAR_P (decl) && DECL_TINFO_P (decl))
2372 /* tinfo visibility is based on the type it's for. */
2373 constrain_visibility
2374 (decl, type_visibility (TREE_TYPE (DECL_NAME (decl))), false);
2376 /* Give the target a chance to override the visibility associated
2378 if (TREE_PUBLIC (decl)
2379 && !DECL_REALLY_EXTERN (decl)
2380 && CLASS_TYPE_P (TREE_TYPE (DECL_NAME (decl)))
2381 && !CLASSTYPE_VISIBILITY_SPECIFIED (TREE_TYPE (DECL_NAME (decl))))
2382 targetm.cxx.determine_class_data_visibility (decl);
2384 else if (use_template)
2385 /* Template instantiations and specializations get visibility based
2386 on their template unless they override it with an attribute. */;
2387 else if (! DECL_VISIBILITY_SPECIFIED (decl))
2389 if (determine_hidden_inline (decl))
2390 DECL_VISIBILITY (decl) = VISIBILITY_HIDDEN;
2393 /* Set default visibility to whatever the user supplied with
2394 #pragma GCC visibility or a namespace visibility attribute. */
2395 DECL_VISIBILITY (decl) = default_visibility;
2396 DECL_VISIBILITY_SPECIFIED (decl) = visibility_options.inpragma;
2403 /* If the specialization doesn't specify visibility, use the
2404 visibility from the template. */
2405 tree tinfo = (TREE_CODE (decl) == TYPE_DECL
2406 ? TYPE_TEMPLATE_INFO (TREE_TYPE (decl))
2407 : DECL_TEMPLATE_INFO (decl));
2408 tree args = TI_ARGS (tinfo);
2409 tree attribs = (TREE_CODE (decl) == TYPE_DECL
2410 ? TYPE_ATTRIBUTES (TREE_TYPE (decl))
2411 : DECL_ATTRIBUTES (decl));
2413 if (args != error_mark_node)
2415 tree pattern = DECL_TEMPLATE_RESULT (TI_TEMPLATE (tinfo));
2417 if (!DECL_VISIBILITY_SPECIFIED (decl))
2419 if (!DECL_VISIBILITY_SPECIFIED (pattern)
2420 && determine_hidden_inline (decl))
2421 DECL_VISIBILITY (decl) = VISIBILITY_HIDDEN;
2424 DECL_VISIBILITY (decl) = DECL_VISIBILITY (pattern);
2425 DECL_VISIBILITY_SPECIFIED (decl)
2426 = DECL_VISIBILITY_SPECIFIED (pattern);
2431 /* Template argument visibility outweighs #pragma or namespace
2432 visibility, but not an explicit attribute. */
2433 && !lookup_attribute ("visibility", attribs))
2435 int depth = TMPL_ARGS_DEPTH (args);
2436 if (DECL_VISIBILITY_SPECIFIED (decl))
2438 /* A class template member with explicit visibility
2439 overrides the class visibility, so we need to apply
2440 all the levels of template args directly. */
2442 for (i = 1; i <= depth; ++i)
2444 tree lev = TMPL_ARGS_LEVEL (args, i);
2445 constrain_visibility_for_template (decl, lev);
2448 else if (PRIMARY_TEMPLATE_P (TI_TEMPLATE (tinfo)))
2449 /* Limit visibility based on its template arguments. */
2450 constrain_visibility_for_template (decl, args);
2456 determine_visibility_from_class (decl, class_type);
2458 if (decl_anon_ns_mem_p (decl))
2459 /* Names in an anonymous namespace get internal linkage.
2460 This might change once we implement export. */
2461 constrain_visibility (decl, VISIBILITY_ANON, false);
2462 else if (TREE_CODE (decl) != TYPE_DECL)
2464 /* Propagate anonymity from type to decl. */
2465 int tvis = type_visibility (TREE_TYPE (decl));
2466 if (tvis == VISIBILITY_ANON
2467 || ! DECL_VISIBILITY_SPECIFIED (decl))
2468 constrain_visibility (decl, tvis, false);
2470 else if (no_linkage_check (TREE_TYPE (decl), /*relaxed_p=*/true))
2471 /* DR 757: A type without linkage shall not be used as the type of a
2472 variable or function with linkage, unless
2473 o the variable or function has extern "C" linkage (7.5 [dcl.link]), or
2474 o the variable or function is not used (3.2 [basic.def.odr]) or is
2475 defined in the same translation unit.
2477 Since non-extern "C" decls need to be defined in the same
2478 translation unit, we can make the type internal. */
2479 constrain_visibility (decl, VISIBILITY_ANON, false);
2481 /* If visibility changed and DECL already has DECL_RTL, ensure
2482 symbol flags are updated. */
2483 if ((DECL_VISIBILITY (decl) != orig_visibility
2484 || DECL_VISIBILITY_SPECIFIED (decl) != orig_visibility_specified)
2485 && ((VAR_P (decl) && TREE_STATIC (decl))
2486 || TREE_CODE (decl) == FUNCTION_DECL)
2487 && DECL_RTL_SET_P (decl))
2488 make_decl_rtl (decl);
2491 /* By default, static data members and function members receive
2492 the visibility of their containing class. */
2495 determine_visibility_from_class (tree decl, tree class_type)
2497 if (DECL_VISIBILITY_SPECIFIED (decl))
2500 if (determine_hidden_inline (decl))
2501 DECL_VISIBILITY (decl) = VISIBILITY_HIDDEN;
2504 /* Default to the class visibility. */
2505 DECL_VISIBILITY (decl) = CLASSTYPE_VISIBILITY (class_type);
2506 DECL_VISIBILITY_SPECIFIED (decl)
2507 = CLASSTYPE_VISIBILITY_SPECIFIED (class_type);
2510 /* Give the target a chance to override the visibility associated
2513 && (DECL_TINFO_P (decl)
2514 || (DECL_VTABLE_OR_VTT_P (decl)
2515 /* Construction virtual tables are not exported because
2516 they cannot be referred to from other object files;
2517 their name is not standardized by the ABI. */
2518 && !DECL_CONSTRUCTION_VTABLE_P (decl)))
2519 && TREE_PUBLIC (decl)
2520 && !DECL_REALLY_EXTERN (decl)
2521 && !CLASSTYPE_VISIBILITY_SPECIFIED (class_type))
2522 targetm.cxx.determine_class_data_visibility (decl);
2525 /* Returns true iff DECL is an inline that should get hidden visibility
2526 because of -fvisibility-inlines-hidden. */
2529 determine_hidden_inline (tree decl)
2531 return (visibility_options.inlines_hidden
2532 /* Don't do this for inline templates; specializations might not be
2533 inline, and we don't want them to inherit the hidden
2534 visibility. We'll set it here for all inline instantiations. */
2535 && !processing_template_decl
2536 && TREE_CODE (decl) == FUNCTION_DECL
2537 && DECL_DECLARED_INLINE_P (decl)
2538 && (! DECL_LANG_SPECIFIC (decl)
2539 || ! DECL_EXPLICIT_INSTANTIATION (decl)));
2542 /* Constrain the visibility of a class TYPE based on the visibility of its
2543 field types. Warn if any fields require lesser visibility. */
2546 constrain_class_visibility (tree type)
2552 int vis = type_visibility (type);
2554 if (vis == VISIBILITY_ANON
2555 || DECL_IN_SYSTEM_HEADER (TYPE_MAIN_DECL (type)))
2558 /* Don't warn about visibility if the class has explicit visibility. */
2559 if (CLASSTYPE_VISIBILITY_SPECIFIED (type))
2560 vis = VISIBILITY_INTERNAL;
2562 for (t = TYPE_FIELDS (type); t; t = DECL_CHAIN (t))
2563 if (TREE_CODE (t) == FIELD_DECL && TREE_TYPE (t) != error_mark_node)
2565 tree ftype = strip_pointer_or_array_types (TREE_TYPE (t));
2566 int subvis = type_visibility (ftype);
2568 if (subvis == VISIBILITY_ANON)
2570 if (!in_main_input_context ())
2572 %qT has a field %qD whose type uses the anonymous namespace",
2575 else if (MAYBE_CLASS_TYPE_P (ftype)
2576 && vis < VISIBILITY_HIDDEN
2577 && subvis >= VISIBILITY_HIDDEN)
2578 warning (OPT_Wattributes, "\
2579 %qT declared with greater visibility than the type of its field %qD",
2583 binfo = TYPE_BINFO (type);
2584 for (i = 0; BINFO_BASE_ITERATE (binfo, i, t); ++i)
2586 int subvis = type_visibility (TREE_TYPE (t));
2588 if (subvis == VISIBILITY_ANON)
2590 if (!in_main_input_context())
2592 %qT has a base %qT whose type uses the anonymous namespace",
2593 type, TREE_TYPE (t));
2595 else if (vis < VISIBILITY_HIDDEN
2596 && subvis >= VISIBILITY_HIDDEN)
2597 warning (OPT_Wattributes, "\
2598 %qT declared with greater visibility than its base %qT",
2599 type, TREE_TYPE (t));
2603 /* Functions for adjusting the visibility of a tagged type and its nested
2604 types and declarations when it gets a name for linkage purposes from a
2607 static void bt_reset_linkage_1 (binding_entry, void *);
2608 static void bt_reset_linkage_2 (binding_entry, void *);
2610 /* First reset the visibility of all the types. */
2613 reset_type_linkage_1 (tree type)
2615 set_linkage_according_to_type (type, TYPE_MAIN_DECL (type));
2616 if (CLASS_TYPE_P (type))
2617 binding_table_foreach (CLASSTYPE_NESTED_UTDS (type),
2618 bt_reset_linkage_1, NULL);
2621 bt_reset_linkage_1 (binding_entry b, void */*data*/)
2623 reset_type_linkage_1 (b->type);
2626 /* Then reset the visibility of any static data members or member
2627 functions that use those types. */
2630 reset_decl_linkage (tree decl)
2632 if (TREE_PUBLIC (decl))
2634 if (DECL_CLONED_FUNCTION_P (decl))
2636 TREE_PUBLIC (decl) = true;
2637 DECL_INTERFACE_KNOWN (decl) = false;
2638 determine_visibility (decl);
2639 tentative_decl_linkage (decl);
2642 reset_type_linkage_2 (tree type)
2644 if (CLASS_TYPE_P (type))
2646 if (tree vt = CLASSTYPE_VTABLES (type))
2648 tree name = mangle_vtbl_for_type (type);
2649 DECL_NAME (vt) = name;
2650 SET_DECL_ASSEMBLER_NAME (vt, name);
2651 reset_decl_linkage (vt);
2653 if (tree ti = CLASSTYPE_TYPEINFO_VAR (type))
2655 tree name = mangle_typeinfo_for_type (type);
2656 DECL_NAME (ti) = name;
2657 SET_DECL_ASSEMBLER_NAME (ti, name);
2658 TREE_TYPE (name) = type;
2659 reset_decl_linkage (ti);
2661 for (tree m = TYPE_FIELDS (type); m; m = DECL_CHAIN (m))
2663 tree mem = STRIP_TEMPLATE (m);
2665 reset_decl_linkage (mem);
2667 for (tree m = TYPE_METHODS (type); m; m = DECL_CHAIN (m))
2669 tree mem = STRIP_TEMPLATE (m);
2670 reset_decl_linkage (mem);
2672 binding_table_foreach (CLASSTYPE_NESTED_UTDS (type),
2673 bt_reset_linkage_2, NULL);
2677 bt_reset_linkage_2 (binding_entry b, void */*data*/)
2679 reset_type_linkage_2 (b->type);
2682 reset_type_linkage (tree type)
2684 reset_type_linkage_1 (type);
2685 reset_type_linkage_2 (type);
2688 /* Set up our initial idea of what the linkage of DECL should be. */
2691 tentative_decl_linkage (tree decl)
2693 if (DECL_INTERFACE_KNOWN (decl))
2694 /* We've already made a decision as to how this function will
2696 else if (vague_linkage_p (decl))
2698 if (TREE_CODE (decl) == FUNCTION_DECL
2699 && decl_defined_p (decl))
2701 DECL_EXTERNAL (decl) = 1;
2702 DECL_NOT_REALLY_EXTERN (decl) = 1;
2703 note_vague_linkage_fn (decl);
2704 /* A non-template inline function with external linkage will
2705 always be COMDAT. As we must eventually determine the
2706 linkage of all functions, and as that causes writes to
2707 the data mapped in from the PCH file, it's advantageous
2708 to mark the functions at this point. */
2709 if (DECL_DECLARED_INLINE_P (decl)
2710 && (!DECL_IMPLICIT_INSTANTIATION (decl)
2711 || DECL_DEFAULTED_FN (decl)))
2713 /* This function must have external linkage, as
2714 otherwise DECL_INTERFACE_KNOWN would have been
2716 gcc_assert (TREE_PUBLIC (decl));
2717 comdat_linkage (decl);
2718 DECL_INTERFACE_KNOWN (decl) = 1;
2721 else if (TREE_CODE (decl) == VAR_DECL)
2722 maybe_commonize_var (decl);
2726 /* DECL is a FUNCTION_DECL or VAR_DECL. If the object file linkage
2727 for DECL has not already been determined, do so now by setting
2728 DECL_EXTERNAL, DECL_COMDAT and other related flags. Until this
2729 function is called entities with vague linkage whose definitions
2730 are available must have TREE_PUBLIC set.
2732 If this function decides to place DECL in COMDAT, it will set
2733 appropriate flags -- but will not clear DECL_EXTERNAL. It is up to
2734 the caller to decide whether or not to clear DECL_EXTERNAL. Some
2735 callers defer that decision until it is clear that DECL is actually
2739 import_export_decl (tree decl)
2744 tree class_type = NULL_TREE;
2746 if (DECL_INTERFACE_KNOWN (decl))
2749 /* We cannot determine what linkage to give to an entity with vague
2750 linkage until the end of the file. For example, a virtual table
2751 for a class will be defined if and only if the key method is
2752 defined in this translation unit. As a further example, consider
2753 that when compiling a translation unit that uses PCH file with
2754 "-frepo" it would be incorrect to make decisions about what
2755 entities to emit when building the PCH; those decisions must be
2756 delayed until the repository information has been processed. */
2757 gcc_assert (at_eof);
2758 /* Object file linkage for explicit instantiations is handled in
2759 mark_decl_instantiated. For static variables in functions with
2760 vague linkage, maybe_commonize_var is used.
2762 Therefore, the only declarations that should be provided to this
2763 function are those with external linkage that are:
2765 * implicit instantiations of function templates
2769 * implicit instantiations of static data members of class
2776 Furthermore, all entities that reach this point must have a
2777 definition available in this translation unit.
2779 The following assertions check these conditions. */
2780 gcc_assert (VAR_OR_FUNCTION_DECL_P (decl));
2781 /* Any code that creates entities with TREE_PUBLIC cleared should
2782 also set DECL_INTERFACE_KNOWN. */
2783 gcc_assert (TREE_PUBLIC (decl));
2784 if (TREE_CODE (decl) == FUNCTION_DECL)
2785 gcc_assert (DECL_IMPLICIT_INSTANTIATION (decl)
2786 || DECL_FRIEND_PSEUDO_TEMPLATE_INSTANTIATION (decl)
2787 || DECL_DECLARED_INLINE_P (decl));
2789 gcc_assert (DECL_IMPLICIT_INSTANTIATION (decl)
2790 || DECL_VTABLE_OR_VTT_P (decl)
2791 || DECL_TINFO_P (decl));
2792 /* Check that a definition of DECL is available in this translation
2794 gcc_assert (!DECL_REALLY_EXTERN (decl));
2796 /* Assume that DECL will not have COMDAT linkage. */
2798 /* Assume that DECL will not be imported into this translation
2802 /* See if the repository tells us whether or not to emit DECL in
2803 this translation unit. */
2804 emit_p = repo_emit_p (decl);
2807 else if (emit_p == 1)
2809 /* The repository indicates that this entity should be defined
2810 here. Make sure the back end honors that request. */
2812 /* Output the definition as an ordinary strong definition. */
2813 DECL_EXTERNAL (decl) = 0;
2814 DECL_INTERFACE_KNOWN (decl) = 1;
2819 /* We have already decided what to do with this DECL; there is no
2820 need to check anything further. */
2822 else if (VAR_P (decl) && DECL_VTABLE_OR_VTT_P (decl))
2824 class_type = DECL_CONTEXT (decl);
2825 import_export_class (class_type);
2826 if (TYPE_FOR_JAVA (class_type))
2828 else if (CLASSTYPE_INTERFACE_KNOWN (class_type)
2829 && CLASSTYPE_INTERFACE_ONLY (class_type))
2831 else if ((!flag_weak || TARGET_WEAK_NOT_IN_ARCHIVE_TOC)
2832 && !CLASSTYPE_USE_TEMPLATE (class_type)
2833 && CLASSTYPE_KEY_METHOD (class_type)
2834 && !DECL_DECLARED_INLINE_P (CLASSTYPE_KEY_METHOD (class_type)))
2835 /* The ABI requires that all virtual tables be emitted with
2836 COMDAT linkage. However, on systems where COMDAT symbols
2837 don't show up in the table of contents for a static
2838 archive, or on systems without weak symbols (where we
2839 approximate COMDAT linkage by using internal linkage), the
2840 linker will report errors about undefined symbols because
2841 it will not see the virtual table definition. Therefore,
2842 in the case that we know that the virtual table will be
2843 emitted in only one translation unit, we make the virtual
2844 table an ordinary definition with external linkage. */
2845 DECL_EXTERNAL (decl) = 0;
2846 else if (CLASSTYPE_INTERFACE_KNOWN (class_type))
2848 /* CLASS_TYPE is being exported from this translation unit,
2849 so DECL should be defined here. */
2850 if (!flag_weak && CLASSTYPE_EXPLICIT_INSTANTIATION (class_type))
2851 /* If a class is declared in a header with the "extern
2852 template" extension, then it will not be instantiated,
2853 even in translation units that would normally require
2854 it. Often such classes are explicitly instantiated in
2855 one translation unit. Therefore, the explicit
2856 instantiation must be made visible to other translation
2858 DECL_EXTERNAL (decl) = 0;
2861 /* The generic C++ ABI says that class data is always
2862 COMDAT, even if there is a key function. Some
2863 variants (e.g., the ARM EABI) says that class data
2864 only has COMDAT linkage if the class data might be
2865 emitted in more than one translation unit. When the
2866 key method can be inline and is inline, we still have
2867 to arrange for comdat even though
2868 class_data_always_comdat is false. */
2869 if (!CLASSTYPE_KEY_METHOD (class_type)
2870 || DECL_DECLARED_INLINE_P (CLASSTYPE_KEY_METHOD (class_type))
2871 || targetm.cxx.class_data_always_comdat ())
2873 /* The ABI requires COMDAT linkage. Normally, we
2874 only emit COMDAT things when they are needed;
2875 make sure that we realize that this entity is
2882 else if (!flag_implicit_templates
2883 && CLASSTYPE_IMPLICIT_INSTANTIATION (class_type))
2888 else if (VAR_P (decl) && DECL_TINFO_P (decl))
2890 tree type = TREE_TYPE (DECL_NAME (decl));
2891 if (CLASS_TYPE_P (type))
2894 import_export_class (type);
2895 if (CLASSTYPE_INTERFACE_KNOWN (type)
2896 && TYPE_POLYMORPHIC_P (type)
2897 && CLASSTYPE_INTERFACE_ONLY (type)
2898 /* If -fno-rtti was specified, then we cannot be sure
2899 that RTTI information will be emitted with the
2900 virtual table of the class, so we must emit it
2901 wherever it is used. */
2906 if (CLASSTYPE_INTERFACE_KNOWN (type)
2907 && !CLASSTYPE_INTERFACE_ONLY (type))
2909 comdat_p = (targetm.cxx.class_data_always_comdat ()
2910 || (CLASSTYPE_KEY_METHOD (type)
2911 && DECL_DECLARED_INLINE_P (CLASSTYPE_KEY_METHOD (type))));
2916 DECL_EXTERNAL (decl) = 0;
2926 else if (DECL_TEMPLOID_INSTANTIATION (decl))
2928 /* DECL is an implicit instantiation of a function or static
2930 if ((flag_implicit_templates
2931 && !flag_use_repository)
2932 || (flag_implicit_inline_templates
2933 && TREE_CODE (decl) == FUNCTION_DECL
2934 && DECL_DECLARED_INLINE_P (decl)))
2937 /* If we are not implicitly generating templates, then mark
2938 this entity as undefined in this translation unit. */
2941 else if (DECL_FUNCTION_MEMBER_P (decl))
2943 if (!DECL_DECLARED_INLINE_P (decl))
2945 tree ctype = DECL_CONTEXT (decl);
2946 import_export_class (ctype);
2947 if (CLASSTYPE_INTERFACE_KNOWN (ctype))
2949 DECL_NOT_REALLY_EXTERN (decl)
2950 = ! (CLASSTYPE_INTERFACE_ONLY (ctype)
2951 || (DECL_DECLARED_INLINE_P (decl)
2952 && ! flag_implement_inlines
2953 && !DECL_VINDEX (decl)));
2955 if (!DECL_NOT_REALLY_EXTERN (decl))
2956 DECL_EXTERNAL (decl) = 1;
2958 /* Always make artificials weak. */
2959 if (DECL_ARTIFICIAL (decl) && flag_weak)
2962 maybe_make_one_only (decl);
2973 /* If we are importing DECL into this translation unit, mark is
2974 an undefined here. */
2975 DECL_EXTERNAL (decl) = 1;
2976 DECL_NOT_REALLY_EXTERN (decl) = 0;
2980 /* If we decided to put DECL in COMDAT, mark it accordingly at
2982 comdat_linkage (decl);
2985 DECL_INTERFACE_KNOWN (decl) = 1;
2988 /* Return an expression that performs the destruction of DECL, which
2989 must be a VAR_DECL whose type has a non-trivial destructor, or is
2990 an array whose (innermost) elements have a non-trivial destructor. */
2993 build_cleanup (tree decl)
2995 tree clean = cxx_maybe_build_cleanup (decl, tf_warning_or_error);
2996 gcc_assert (clean != NULL_TREE);
3000 /* Returns the initialization guard variable for the variable DECL,
3001 which has static storage duration. */
3004 get_guard (tree decl)
3009 sname = mangle_guard_variable (decl);
3010 guard = IDENTIFIER_GLOBAL_VALUE (sname);
3015 /* We use a type that is big enough to contain a mutex as well
3016 as an integer counter. */
3017 guard_type = targetm.cxx.guard_type ();
3018 guard = build_decl (DECL_SOURCE_LOCATION (decl),
3019 VAR_DECL, sname, guard_type);
3021 /* The guard should have the same linkage as what it guards. */
3022 TREE_PUBLIC (guard) = TREE_PUBLIC (decl);
3023 TREE_STATIC (guard) = TREE_STATIC (decl);
3024 DECL_COMMON (guard) = DECL_COMMON (decl);
3025 DECL_COMDAT (guard) = DECL_COMDAT (decl);
3026 set_decl_tls_model (guard, DECL_TLS_MODEL (decl));
3027 if (DECL_ONE_ONLY (decl))
3028 make_decl_one_only (guard, cxx_comdat_group (guard));
3029 if (TREE_PUBLIC (decl))
3030 DECL_WEAK (guard) = DECL_WEAK (decl);
3031 DECL_VISIBILITY (guard) = DECL_VISIBILITY (decl);
3032 DECL_VISIBILITY_SPECIFIED (guard) = DECL_VISIBILITY_SPECIFIED (decl);
3034 DECL_ARTIFICIAL (guard) = 1;
3035 DECL_IGNORED_P (guard) = 1;
3036 TREE_USED (guard) = 1;
3037 pushdecl_top_level_and_finish (guard, NULL_TREE);
3042 /* Return those bits of the GUARD variable that should be set when the
3043 guarded entity is actually initialized. */
3046 get_guard_bits (tree guard)
3048 if (!targetm.cxx.guard_mask_bit ())
3050 /* We only set the first byte of the guard, in order to leave room
3051 for a mutex in the high-order bits. */
3052 guard = build1 (ADDR_EXPR,
3053 build_pointer_type (TREE_TYPE (guard)),
3055 guard = build1 (NOP_EXPR,
3056 build_pointer_type (char_type_node),
3058 guard = build1 (INDIRECT_REF, char_type_node, guard);
3064 /* Return an expression which determines whether or not the GUARD
3065 variable has already been initialized. */
3068 get_guard_cond (tree guard)
3072 /* Check to see if the GUARD is zero. */
3073 guard = get_guard_bits (guard);
3075 /* Mask off all but the low bit. */
3076 if (targetm.cxx.guard_mask_bit ())
3078 guard_value = integer_one_node;
3079 if (!same_type_p (TREE_TYPE (guard_value), TREE_TYPE (guard)))
3080 guard_value = convert (TREE_TYPE (guard), guard_value);
3081 guard = cp_build_binary_op (input_location,
3082 BIT_AND_EXPR, guard, guard_value,
3083 tf_warning_or_error);
3086 guard_value = integer_zero_node;
3087 if (!same_type_p (TREE_TYPE (guard_value), TREE_TYPE (guard)))
3088 guard_value = convert (TREE_TYPE (guard), guard_value);
3089 return cp_build_binary_op (input_location,
3090 EQ_EXPR, guard, guard_value,
3091 tf_warning_or_error);
3094 /* Return an expression which sets the GUARD variable, indicating that
3095 the variable being guarded has been initialized. */
3098 set_guard (tree guard)
3102 /* Set the GUARD to one. */
3103 guard = get_guard_bits (guard);
3104 guard_init = integer_one_node;
3105 if (!same_type_p (TREE_TYPE (guard_init), TREE_TYPE (guard)))
3106 guard_init = convert (TREE_TYPE (guard), guard_init);
3107 return cp_build_modify_expr (guard, NOP_EXPR, guard_init,
3108 tf_warning_or_error);
3111 /* Returns true iff we can tell that VAR does not have a dynamic
3115 var_defined_without_dynamic_init (tree var)
3117 /* If it's defined in another TU, we can't tell. */
3118 if (DECL_EXTERNAL (var))
3120 /* If it has a non-trivial destructor, registering the destructor
3121 counts as dynamic initialization. */
3122 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (TREE_TYPE (var)))
3124 /* If it's in this TU, its initializer has been processed, unless
3125 it's a case of self-initialization, then DECL_INITIALIZED_P is
3126 false while the initializer is handled by finish_id_expression. */
3127 if (!DECL_INITIALIZED_P (var))
3129 /* If it has no initializer or a constant one, it's not dynamic. */
3130 return (!DECL_NONTRIVIALLY_INITIALIZED_P (var)
3131 || DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (var));
3134 /* Returns true iff VAR is a variable that needs uses to be
3135 wrapped for possible dynamic initialization. */
3138 var_needs_tls_wrapper (tree var)
3140 return (!error_operand_p (var)
3141 && DECL_THREAD_LOCAL_P (var)
3142 && !DECL_GNU_TLS_P (var)
3143 && !DECL_FUNCTION_SCOPE_P (var)
3144 && !var_defined_without_dynamic_init (var));
3147 /* Get the FUNCTION_DECL for the shared TLS init function for this
3148 translation unit. */
3151 get_local_tls_init_fn (void)
3153 tree sname = get_identifier ("__tls_init");
3154 tree fn = IDENTIFIER_GLOBAL_VALUE (sname);
3157 fn = build_lang_decl (FUNCTION_DECL, sname,
3158 build_function_type (void_type_node,
3160 SET_DECL_LANGUAGE (fn, lang_c);
3161 TREE_PUBLIC (fn) = false;
3162 DECL_ARTIFICIAL (fn) = true;
3164 SET_IDENTIFIER_GLOBAL_VALUE (sname, fn);
3169 /* Get a FUNCTION_DECL for the init function for the thread_local
3170 variable VAR. The init function will be an alias to the function
3171 that initializes all the non-local TLS variables in the translation
3172 unit. The init function is only used by the wrapper function. */
3175 get_tls_init_fn (tree var)
3177 /* Only C++11 TLS vars need this init fn. */
3178 if (!var_needs_tls_wrapper (var))
3181 /* If -fno-extern-tls-init, assume that we don't need to call
3182 a tls init function for a variable defined in another TU. */
3183 if (!flag_extern_tls_init && DECL_EXTERNAL (var))
3186 #ifdef ASM_OUTPUT_DEF
3187 /* If the variable is internal, or if we can't generate aliases,
3188 call the local init function directly. */
3189 if (!TREE_PUBLIC (var))
3191 return get_local_tls_init_fn ();
3193 tree sname = mangle_tls_init_fn (var);
3194 tree fn = IDENTIFIER_GLOBAL_VALUE (sname);
3197 fn = build_lang_decl (FUNCTION_DECL, sname,
3198 build_function_type (void_type_node,
3200 SET_DECL_LANGUAGE (fn, lang_c);
3201 TREE_PUBLIC (fn) = TREE_PUBLIC (var);
3202 DECL_ARTIFICIAL (fn) = true;
3203 DECL_COMDAT (fn) = DECL_COMDAT (var);
3204 DECL_EXTERNAL (fn) = DECL_EXTERNAL (var);
3205 if (DECL_ONE_ONLY (var))
3206 make_decl_one_only (fn, cxx_comdat_group (fn));
3207 if (TREE_PUBLIC (var))
3209 tree obtype = strip_array_types (non_reference (TREE_TYPE (var)));
3210 /* If the variable is defined somewhere else and might have static
3211 initialization, make the init function a weak reference. */
3212 if ((!TYPE_NEEDS_CONSTRUCTING (obtype)
3213 || TYPE_HAS_CONSTEXPR_CTOR (obtype))
3214 && TYPE_HAS_TRIVIAL_DESTRUCTOR (obtype)
3215 && DECL_EXTERNAL (var))
3218 DECL_WEAK (fn) = DECL_WEAK (var);
3220 DECL_VISIBILITY (fn) = DECL_VISIBILITY (var);
3221 DECL_VISIBILITY_SPECIFIED (fn) = DECL_VISIBILITY_SPECIFIED (var);
3222 DECL_DLLIMPORT_P (fn) = DECL_DLLIMPORT_P (var);
3223 DECL_IGNORED_P (fn) = 1;
3226 DECL_BEFRIENDING_CLASSES (fn) = var;
3228 SET_IDENTIFIER_GLOBAL_VALUE (sname, fn);
3233 /* Get a FUNCTION_DECL for the init wrapper function for the thread_local
3234 variable VAR. The wrapper function calls the init function (if any) for
3235 VAR and then returns a reference to VAR. The wrapper function is used
3236 in place of VAR everywhere VAR is mentioned. */
3239 get_tls_wrapper_fn (tree var)
3241 /* Only C++11 TLS vars need this wrapper fn. */
3242 if (!var_needs_tls_wrapper (var))
3245 tree sname = mangle_tls_wrapper_fn (var);
3246 tree fn = IDENTIFIER_GLOBAL_VALUE (sname);
3249 /* A named rvalue reference is an lvalue, so the wrapper should
3250 always return an lvalue reference. */
3251 tree type = non_reference (TREE_TYPE (var));
3252 type = build_reference_type (type);
3253 tree fntype = build_function_type (type, void_list_node);
3254 fn = build_lang_decl (FUNCTION_DECL, sname, fntype);
3255 SET_DECL_LANGUAGE (fn, lang_c);
3256 TREE_PUBLIC (fn) = TREE_PUBLIC (var);
3257 DECL_ARTIFICIAL (fn) = true;
3258 DECL_IGNORED_P (fn) = 1;
3259 /* The wrapper is inline and emitted everywhere var is used. */
3260 DECL_DECLARED_INLINE_P (fn) = true;
3261 if (TREE_PUBLIC (var))
3263 comdat_linkage (fn);
3264 #ifdef HAVE_GAS_HIDDEN
3265 /* Make the wrapper bind locally; there's no reason to share
3266 the wrapper between multiple shared objects. */
3267 DECL_VISIBILITY (fn) = VISIBILITY_INTERNAL;
3268 DECL_VISIBILITY_SPECIFIED (fn) = true;
3271 if (!TREE_PUBLIC (fn))
3272 DECL_INTERFACE_KNOWN (fn) = true;
3274 note_vague_linkage_fn (fn);
3277 /* We want CSE to commonize calls to the wrapper, but marking it as
3278 pure is unsafe since it has side-effects. I guess we need a new
3279 ECF flag even weaker than ECF_PURE. FIXME! */
3280 DECL_PURE_P (fn) = true;
3283 DECL_BEFRIENDING_CLASSES (fn) = var;
3285 SET_IDENTIFIER_GLOBAL_VALUE (sname, fn);
3290 /* At EOF, generate the definition for the TLS wrapper function FN:
3293 if (init_fn) init_fn();
3298 generate_tls_wrapper (tree fn)
3300 tree var = DECL_BEFRIENDING_CLASSES (fn);
3302 start_preparsed_function (fn, NULL_TREE, SF_DEFAULT | SF_PRE_PARSED);
3303 tree body = begin_function_body ();
3304 /* Only call the init fn if there might be one. */
3305 if (tree init_fn = get_tls_init_fn (var))
3307 tree if_stmt = NULL_TREE;
3308 /* If init_fn is a weakref, make sure it exists before calling. */
3309 if (lookup_attribute ("weak", DECL_ATTRIBUTES (init_fn)))
3311 if_stmt = begin_if_stmt ();
3312 tree addr = cp_build_addr_expr (init_fn, tf_warning_or_error);
3313 tree cond = cp_build_binary_op (DECL_SOURCE_LOCATION (var),
3314 NE_EXPR, addr, nullptr_node,
3315 tf_warning_or_error);
3316 finish_if_stmt_cond (cond, if_stmt);
3318 finish_expr_stmt (build_cxx_call
3319 (init_fn, 0, NULL, tf_warning_or_error));
3322 finish_then_clause (if_stmt);
3323 finish_if_stmt (if_stmt);
3327 /* If there's no initialization, the wrapper is a constant function. */
3328 TREE_READONLY (fn) = true;
3329 finish_return_stmt (convert_from_reference (var));
3330 finish_function_body (body);
3331 expand_or_defer_fn (finish_function (0));
3334 /* Start the process of running a particular set of global constructors
3335 or destructors. Subroutine of do_[cd]tors. Also called from
3336 vtv_start_verification_constructor_init_function. */
3339 start_objects (int method_type, int initp)
3345 /* Make ctor or dtor function. METHOD_TYPE may be 'I' or 'D'. */
3347 if (initp != DEFAULT_INIT_PRIORITY)
3357 sprintf (type, "sub_%c%c%.5u", method_type, joiner, initp);
3360 sprintf (type, "sub_%c", method_type);
3362 fndecl = build_lang_decl (FUNCTION_DECL,
3363 get_file_function_name (type),
3364 build_function_type_list (void_type_node,
3366 start_preparsed_function (fndecl, /*attrs=*/NULL_TREE, SF_PRE_PARSED);
3368 TREE_PUBLIC (current_function_decl) = 0;
3370 /* Mark as artificial because it's not explicitly in the user's
3372 DECL_ARTIFICIAL (current_function_decl) = 1;
3374 /* Mark this declaration as used to avoid spurious warnings. */
3375 TREE_USED (current_function_decl) = 1;
3377 /* Mark this function as a global constructor or destructor. */
3378 if (method_type == 'I')
3379 DECL_GLOBAL_CTOR_P (current_function_decl) = 1;
3381 DECL_GLOBAL_DTOR_P (current_function_decl) = 1;
3383 body = begin_compound_stmt (BCS_FN_BODY);
3388 /* Finish the process of running a particular set of global constructors
3389 or destructors. Subroutine of do_[cd]tors. */
3392 finish_objects (int method_type, int initp, tree body)
3397 finish_compound_stmt (body);
3398 fn = finish_function (0);
3400 if (method_type == 'I')
3402 DECL_STATIC_CONSTRUCTOR (fn) = 1;
3403 decl_init_priority_insert (fn, initp);
3407 DECL_STATIC_DESTRUCTOR (fn) = 1;
3408 decl_fini_priority_insert (fn, initp);
3411 expand_or_defer_fn (fn);
3414 /* The names of the parameters to the function created to handle
3415 initializations and destructions for objects with static storage
3417 #define INITIALIZE_P_IDENTIFIER "__initialize_p"
3418 #define PRIORITY_IDENTIFIER "__priority"
3420 /* The name of the function we create to handle initializations and
3421 destructions for objects with static storage duration. */
3422 #define SSDF_IDENTIFIER "__static_initialization_and_destruction"
3424 /* The declaration for the __INITIALIZE_P argument. */
3425 static GTY(()) tree initialize_p_decl;
3427 /* The declaration for the __PRIORITY argument. */
3428 static GTY(()) tree priority_decl;
3430 /* The declaration for the static storage duration function. */
3431 static GTY(()) tree ssdf_decl;
3433 /* All the static storage duration functions created in this
3434 translation unit. */
3435 static GTY(()) vec<tree, va_gc> *ssdf_decls;
3437 /* A map from priority levels to information about that priority
3438 level. There may be many such levels, so efficient lookup is
3440 static splay_tree priority_info_map;
3442 /* Begins the generation of the function that will handle all
3443 initialization and destruction of objects with static storage
3444 duration. The function generated takes two parameters of type
3445 `int': __INITIALIZE_P and __PRIORITY. If __INITIALIZE_P is
3446 nonzero, it performs initializations. Otherwise, it performs
3447 destructions. It only performs those initializations or
3448 destructions with the indicated __PRIORITY. The generated function
3451 It is assumed that this function will only be called once per
3452 translation unit. */
3455 start_static_storage_duration_function (unsigned count)
3459 char id[sizeof (SSDF_IDENTIFIER) + 1 /* '\0' */ + 32];
3461 /* Create the identifier for this function. It will be of the form
3462 SSDF_IDENTIFIER_<number>. */
3463 sprintf (id, "%s_%u", SSDF_IDENTIFIER, count);
3465 type = build_function_type_list (void_type_node,
3466 integer_type_node, integer_type_node,
3469 /* Create the FUNCTION_DECL itself. */
3470 ssdf_decl = build_lang_decl (FUNCTION_DECL,
3471 get_identifier (id),
3473 TREE_PUBLIC (ssdf_decl) = 0;
3474 DECL_ARTIFICIAL (ssdf_decl) = 1;
3476 /* Put this function in the list of functions to be called from the
3477 static constructors and destructors. */
3480 vec_alloc (ssdf_decls, 32);
3482 /* Take this opportunity to initialize the map from priority
3483 numbers to information about that priority level. */
3484 priority_info_map = splay_tree_new (splay_tree_compare_ints,
3485 /*delete_key_fn=*/0,
3486 /*delete_value_fn=*/
3487 (splay_tree_delete_value_fn) &free);
3489 /* We always need to generate functions for the
3490 DEFAULT_INIT_PRIORITY so enter it now. That way when we walk
3491 priorities later, we'll be sure to find the
3492 DEFAULT_INIT_PRIORITY. */
3493 get_priority_info (DEFAULT_INIT_PRIORITY);
3496 vec_safe_push (ssdf_decls, ssdf_decl);
3498 /* Create the argument list. */
3499 initialize_p_decl = cp_build_parm_decl
3500 (get_identifier (INITIALIZE_P_IDENTIFIER), integer_type_node);
3501 DECL_CONTEXT (initialize_p_decl) = ssdf_decl;
3502 TREE_USED (initialize_p_decl) = 1;
3503 priority_decl = cp_build_parm_decl
3504 (get_identifier (PRIORITY_IDENTIFIER), integer_type_node);
3505 DECL_CONTEXT (priority_decl) = ssdf_decl;
3506 TREE_USED (priority_decl) = 1;
3508 DECL_CHAIN (initialize_p_decl) = priority_decl;
3509 DECL_ARGUMENTS (ssdf_decl) = initialize_p_decl;
3511 /* Put the function in the global scope. */
3512 pushdecl (ssdf_decl);
3514 /* Start the function itself. This is equivalent to declaring the
3517 static void __ssdf (int __initialize_p, init __priority_p);
3519 It is static because we only need to call this function from the
3520 various constructor and destructor functions for this module. */
3521 start_preparsed_function (ssdf_decl,
3522 /*attrs=*/NULL_TREE,
3525 /* Set up the scope of the outermost block in the function. */
3526 body = begin_compound_stmt (BCS_FN_BODY);
3531 /* Finish the generation of the function which performs initialization
3532 and destruction of objects with static storage duration. After
3533 this point, no more such objects can be created. */
3536 finish_static_storage_duration_function (tree body)
3538 /* Close out the function. */
3539 finish_compound_stmt (body);
3540 expand_or_defer_fn (finish_function (0));
3543 /* Return the information about the indicated PRIORITY level. If no
3544 code to handle this level has yet been generated, generate the
3545 appropriate prologue. */
3547 static priority_info
3548 get_priority_info (int priority)
3553 n = splay_tree_lookup (priority_info_map,
3554 (splay_tree_key) priority);
3557 /* Create a new priority information structure, and insert it
3559 pi = XNEW (struct priority_info_s);
3560 pi->initializations_p = 0;
3561 pi->destructions_p = 0;
3562 splay_tree_insert (priority_info_map,
3563 (splay_tree_key) priority,
3564 (splay_tree_value) pi);
3567 pi = (priority_info) n->value;
3572 /* The effective initialization priority of a DECL. */
3574 #define DECL_EFFECTIVE_INIT_PRIORITY(decl) \
3575 ((!DECL_HAS_INIT_PRIORITY_P (decl) || DECL_INIT_PRIORITY (decl) == 0) \
3576 ? DEFAULT_INIT_PRIORITY : DECL_INIT_PRIORITY (decl))
3578 /* Whether a DECL needs a guard to protect it against multiple
3581 #define NEEDS_GUARD_P(decl) (TREE_PUBLIC (decl) && (DECL_COMMON (decl) \
3582 || DECL_ONE_ONLY (decl) \
3583 || DECL_WEAK (decl)))
3585 /* Called from one_static_initialization_or_destruction(),
3587 Walks the initializer list of a global variable and looks for
3588 temporary variables (DECL_NAME() == NULL and DECL_ARTIFICIAL != 0)
3589 and that have their DECL_CONTEXT() == NULL.
3590 For each such temporary variable, set their DECL_CONTEXT() to
3591 the current function. This is necessary because otherwise
3592 some optimizers (enabled by -O2 -fprofile-arcs) might crash
3593 when trying to refer to a temporary variable that does not have
3594 it's DECL_CONTECT() properly set. */
3596 fix_temporary_vars_context_r (tree *node,
3600 gcc_assert (current_function_decl);
3602 if (TREE_CODE (*node) == BIND_EXPR)
3606 for (var = BIND_EXPR_VARS (*node); var; var = DECL_CHAIN (var))
3609 && DECL_ARTIFICIAL (var)
3610 && !DECL_CONTEXT (var))
3611 DECL_CONTEXT (var) = current_function_decl;
3617 /* Set up to handle the initialization or destruction of DECL. If
3618 INITP is nonzero, we are initializing the variable. Otherwise, we
3619 are destroying it. */
3622 one_static_initialization_or_destruction (tree decl, tree init, bool initp)
3624 tree guard_if_stmt = NULL_TREE;
3627 /* If we are supposed to destruct and there's a trivial destructor,
3628 nothing has to be done. */
3630 && TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
3633 /* Trick the compiler into thinking we are at the file and line
3634 where DECL was declared so that error-messages make sense, and so
3635 that the debugger will show somewhat sensible file and line
3637 input_location = DECL_SOURCE_LOCATION (decl);
3639 /* Make sure temporary variables in the initialiser all have
3640 their DECL_CONTEXT() set to a value different from NULL_TREE.
3641 This can happen when global variables initialisers are built.
3642 In that case, the DECL_CONTEXT() of the global variables _AND_ of all
3643 the temporary variables that might have been generated in the
3644 accompagning initialisers is NULL_TREE, meaning the variables have been
3645 declared in the global namespace.
3646 What we want to do here is to fix that and make sure the DECL_CONTEXT()
3647 of the temporaries are set to the current function decl. */
3648 cp_walk_tree_without_duplicates (&init,
3649 fix_temporary_vars_context_r,
3656 Access control for implicit calls to the constructors,
3657 the conversion functions, or the destructor called to
3658 create and destroy a static data member is performed as
3659 if these calls appeared in the scope of the member's
3662 we pretend we are in a static member function of the class of
3663 which the DECL is a member. */
3664 if (member_p (decl))
3666 DECL_CONTEXT (current_function_decl) = DECL_CONTEXT (decl);
3667 DECL_STATIC_FUNCTION_P (current_function_decl) = 1;
3670 /* Assume we don't need a guard. */
3672 /* We need a guard if this is an object with external linkage that
3673 might be initialized in more than one place. (For example, a
3674 static data member of a template, when the data member requires
3676 if (NEEDS_GUARD_P (decl))
3680 guard = get_guard (decl);
3682 /* When using __cxa_atexit, we just check the GUARD as we would
3683 for a local static. */
3684 if (flag_use_cxa_atexit)
3686 /* When using __cxa_atexit, we never try to destroy
3687 anything from a static destructor. */
3689 guard_cond = get_guard_cond (guard);
3691 /* If we don't have __cxa_atexit, then we will be running
3692 destructors from .fini sections, or their equivalents. So,
3693 we need to know how many times we've tried to initialize this
3694 object. We do initializations only if the GUARD is zero,
3695 i.e., if we are the first to initialize the variable. We do
3696 destructions only if the GUARD is one, i.e., if we are the
3697 last to destroy the variable. */
3700 = cp_build_binary_op (input_location,
3702 cp_build_unary_op (PREINCREMENT_EXPR,
3705 tf_warning_or_error),
3707 tf_warning_or_error);
3710 = cp_build_binary_op (input_location,
3712 cp_build_unary_op (PREDECREMENT_EXPR,
3715 tf_warning_or_error),
3717 tf_warning_or_error);
3719 guard_if_stmt = begin_if_stmt ();
3720 finish_if_stmt_cond (guard_cond, guard_if_stmt);
3724 /* If we're using __cxa_atexit, we have not already set the GUARD,
3725 so we must do so now. */
3726 if (guard && initp && flag_use_cxa_atexit)
3727 finish_expr_stmt (set_guard (guard));
3729 /* Perform the initialization or destruction. */
3734 finish_expr_stmt (init);
3735 if (flag_sanitize & SANITIZE_ADDRESS)
3737 varpool_node *vnode = varpool_node::get (decl);
3739 vnode->dynamically_initialized = 1;
3743 /* If we're using __cxa_atexit, register a function that calls the
3744 destructor for the object. */
3745 if (flag_use_cxa_atexit)
3746 finish_expr_stmt (register_dtor_fn (decl));
3749 finish_expr_stmt (build_cleanup (decl));
3751 /* Finish the guard if-stmt, if necessary. */
3754 finish_then_clause (guard_if_stmt);
3755 finish_if_stmt (guard_if_stmt);
3758 /* Now that we're done with DECL we don't need to pretend to be a
3759 member of its class any longer. */
3760 DECL_CONTEXT (current_function_decl) = NULL_TREE;
3761 DECL_STATIC_FUNCTION_P (current_function_decl) = 0;
3764 /* Generate code to do the initialization or destruction of the decls in VARS,
3765 a TREE_LIST of VAR_DECL with static storage duration.
3766 Whether initialization or destruction is performed is specified by INITP. */
3769 do_static_initialization_or_destruction (tree vars, bool initp)
3771 tree node, init_if_stmt, cond;
3773 /* Build the outer if-stmt to check for initialization or destruction. */
3774 init_if_stmt = begin_if_stmt ();
3775 cond = initp ? integer_one_node : integer_zero_node;
3776 cond = cp_build_binary_op (input_location,
3780 tf_warning_or_error);
3781 finish_if_stmt_cond (cond, init_if_stmt);
3783 /* To make sure dynamic construction doesn't access globals from other
3784 compilation units where they might not be yet constructed, for
3785 -fsanitize=address insert __asan_before_dynamic_init call that
3786 prevents access to either all global variables that need construction
3787 in other compilation units, or at least those that haven't been
3788 initialized yet. Variables that need dynamic construction in
3789 the current compilation unit are kept accessible. */
3790 if (flag_sanitize & SANITIZE_ADDRESS)
3791 finish_expr_stmt (asan_dynamic_init_call (/*after_p=*/false));
3795 tree decl = TREE_VALUE (node);
3796 tree priority_if_stmt;
3800 /* If we don't need a destructor, there's nothing to do. Avoid
3801 creating a possibly empty if-stmt. */
3802 if (!initp && TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
3804 node = TREE_CHAIN (node);
3808 /* Remember that we had an initialization or finalization at this
3810 priority = DECL_EFFECTIVE_INIT_PRIORITY (decl);
3811 pi = get_priority_info (priority);
3813 pi->initializations_p = 1;
3815 pi->destructions_p = 1;
3817 /* Conditionalize this initialization on being in the right priority
3818 and being initializing/finalizing appropriately. */
3819 priority_if_stmt = begin_if_stmt ();
3820 cond = cp_build_binary_op (input_location,
3823 build_int_cst (NULL_TREE, priority),
3824 tf_warning_or_error);
3825 finish_if_stmt_cond (cond, priority_if_stmt);
3827 /* Process initializers with same priority. */
3829 && DECL_EFFECTIVE_INIT_PRIORITY (TREE_VALUE (node)) == priority;
3830 node = TREE_CHAIN (node))
3831 /* Do one initialization or destruction. */
3832 one_static_initialization_or_destruction (TREE_VALUE (node),
3833 TREE_PURPOSE (node), initp);
3835 /* Finish up the priority if-stmt body. */
3836 finish_then_clause (priority_if_stmt);
3837 finish_if_stmt (priority_if_stmt);
3841 /* Revert what __asan_before_dynamic_init did by calling
3842 __asan_after_dynamic_init. */
3843 if (flag_sanitize & SANITIZE_ADDRESS)
3844 finish_expr_stmt (asan_dynamic_init_call (/*after_p=*/true));
3846 /* Finish up the init/destruct if-stmt body. */
3847 finish_then_clause (init_if_stmt);
3848 finish_if_stmt (init_if_stmt);
3851 /* VARS is a list of variables with static storage duration which may
3852 need initialization and/or finalization. Remove those variables
3853 that don't really need to be initialized or finalized, and return
3854 the resulting list. The order in which the variables appear in
3855 VARS is in reverse order of the order in which they should actually
3856 be initialized. The list we return is in the unreversed order;
3857 i.e., the first variable should be initialized first. */
3860 prune_vars_needing_no_initialization (tree *vars)
3863 tree result = NULL_TREE;
3868 tree decl = TREE_VALUE (t);
3869 tree init = TREE_PURPOSE (t);
3871 /* Deal gracefully with error. */
3872 if (decl == error_mark_node)
3874 var = &TREE_CHAIN (t);
3878 /* The only things that can be initialized are variables. */
3879 gcc_assert (VAR_P (decl));
3881 /* If this object is not defined, we don't need to do anything
3883 if (DECL_EXTERNAL (decl))
3885 var = &TREE_CHAIN (t);
3889 /* Also, if the initializer already contains errors, we can bail
3891 if (init && TREE_CODE (init) == TREE_LIST
3892 && value_member (error_mark_node, init))
3894 var = &TREE_CHAIN (t);
3898 /* This variable is going to need initialization and/or
3899 finalization, so we add it to the list. */
3900 *var = TREE_CHAIN (t);
3901 TREE_CHAIN (t) = result;
3908 /* Make sure we have told the back end about all the variables in
3912 write_out_vars (tree vars)
3916 for (v = vars; v; v = TREE_CHAIN (v))
3918 tree var = TREE_VALUE (v);
3919 if (!var_finalized_p (var))
3921 import_export_decl (var);
3922 rest_of_decl_compilation (var, 1, 1);
3927 /* Generate a static constructor (if CONSTRUCTOR_P) or destructor
3928 (otherwise) that will initialize all global objects with static
3929 storage duration having the indicated PRIORITY. */
3932 generate_ctor_or_dtor_function (bool constructor_p, int priority,
3940 input_location = *locus;
3942 /* Was: locus->line++; */
3944 /* We use `I' to indicate initialization and `D' to indicate
3946 function_key = constructor_p ? 'I' : 'D';
3948 /* We emit the function lazily, to avoid generating empty
3949 global constructors and destructors. */
3952 /* For Objective-C++, we may need to initialize metadata found in this module.
3953 This must be done _before_ any other static initializations. */
3954 if (c_dialect_objc () && (priority == DEFAULT_INIT_PRIORITY)
3955 && constructor_p && objc_static_init_needed_p ())
3957 body = start_objects (function_key, priority);
3958 objc_generate_static_init_call (NULL_TREE);
3961 /* Call the static storage duration function with appropriate
3963 FOR_EACH_VEC_SAFE_ELT (ssdf_decls, i, fndecl)
3965 /* Calls to pure or const functions will expand to nothing. */
3966 if (! (flags_from_decl_or_type (fndecl) & (ECF_CONST | ECF_PURE)))
3971 body = start_objects (function_key, priority);
3973 call = cp_build_function_call_nary (fndecl, tf_warning_or_error,
3974 build_int_cst (NULL_TREE,
3976 build_int_cst (NULL_TREE,
3979 finish_expr_stmt (call);
3983 /* Close out the function. */
3985 finish_objects (function_key, priority, body);
3988 /* Generate constructor and destructor functions for the priority
3992 generate_ctor_and_dtor_functions_for_priority (splay_tree_node n, void * data)
3994 location_t *locus = (location_t *) data;
3995 int priority = (int) n->key;
3996 priority_info pi = (priority_info) n->value;
3998 /* Generate the functions themselves, but only if they are really
4000 if (pi->initializations_p)
4001 generate_ctor_or_dtor_function (/*constructor_p=*/true, priority, locus);
4002 if (pi->destructions_p)
4003 generate_ctor_or_dtor_function (/*constructor_p=*/false, priority, locus);
4005 /* Keep iterating. */
4009 /* Java requires that we be able to reference a local address for a
4010 method, and not be confused by PLT entries. If hidden aliases are
4011 supported, collect and return all the functions for which we should
4012 emit a hidden alias. */
4014 static hash_set<tree> *
4015 collect_candidates_for_java_method_aliases (void)
4017 struct cgraph_node *node;
4018 hash_set<tree> *candidates = NULL;
4020 #ifndef HAVE_GAS_HIDDEN
4024 FOR_EACH_FUNCTION (node)
4026 tree fndecl = node->decl;
4028 if (DECL_CLASS_SCOPE_P (fndecl)
4029 && TYPE_FOR_JAVA (DECL_CONTEXT (fndecl))
4030 && TARGET_USE_LOCAL_THUNK_ALIAS_P (fndecl))
4032 if (candidates == NULL)
4033 candidates = new hash_set<tree>;
4034 candidates->add (fndecl);
4042 /* Java requires that we be able to reference a local address for a
4043 method, and not be confused by PLT entries. If hidden aliases are
4044 supported, emit one for each java function that we've emitted.
4045 CANDIDATES is the set of FUNCTION_DECLs that were gathered
4046 by collect_candidates_for_java_method_aliases. */
4049 build_java_method_aliases (hash_set<tree> *candidates)
4051 struct cgraph_node *node;
4053 #ifndef HAVE_GAS_HIDDEN
4057 FOR_EACH_FUNCTION (node)
4059 tree fndecl = node->decl;
4061 if (TREE_ASM_WRITTEN (fndecl)
4062 && candidates->contains (fndecl))
4064 /* Mangle the name in a predictable way; we need to reference
4065 this from a java compiled object file. */
4066 tree oid, nid, alias;
4070 oid = DECL_ASSEMBLER_NAME (fndecl);
4071 oname = IDENTIFIER_POINTER (oid);
4072 gcc_assert (oname[0] == '_' && oname[1] == 'Z');
4073 nname = ACONCAT (("_ZGA", oname+2, NULL));
4074 nid = get_identifier (nname);
4076 alias = make_alias_for (fndecl, nid);
4077 TREE_PUBLIC (alias) = 1;
4078 DECL_VISIBILITY (alias) = VISIBILITY_HIDDEN;
4080 assemble_alias (alias, oid);
4085 /* Return C++ property of T, based on given operation OP. */
4088 cpp_check (tree t, cpp_operation op)
4093 return DECL_PURE_VIRTUAL_P (t);
4094 case IS_CONSTRUCTOR:
4095 return DECL_CONSTRUCTOR_P (t);
4097 return DECL_DESTRUCTOR_P (t);
4098 case IS_COPY_CONSTRUCTOR:
4099 return DECL_COPY_CONSTRUCTOR_P (t);
4101 return TREE_CODE (t) == TEMPLATE_DECL;
4103 return trivial_type_p (t);
4109 /* Collect source file references recursively, starting from NAMESPC. */
4112 collect_source_refs (tree namespc)
4119 /* Iterate over names in this name space. */
4120 for (t = NAMESPACE_LEVEL (namespc)->names; t; t = TREE_CHAIN (t))
4121 if (!DECL_IS_BUILTIN (t) )
4122 collect_source_ref (DECL_SOURCE_FILE (t));
4124 /* Dump siblings, if any */
4125 collect_source_refs (TREE_CHAIN (namespc));
4127 /* Dump children, if any */
4128 collect_source_refs (NAMESPACE_LEVEL (namespc)->namespaces);
4131 /* Collect decls relevant to SOURCE_FILE from all namespaces recursively,
4132 starting from NAMESPC. */
4135 collect_ada_namespace (tree namespc, const char *source_file)
4140 /* Collect decls from this namespace */
4141 collect_ada_nodes (NAMESPACE_LEVEL (namespc)->names, source_file);
4143 /* Collect siblings, if any */
4144 collect_ada_namespace (TREE_CHAIN (namespc), source_file);
4146 /* Collect children, if any */
4147 collect_ada_namespace (NAMESPACE_LEVEL (namespc)->namespaces, source_file);
4150 /* Returns true iff there is a definition available for variable or
4154 decl_defined_p (tree decl)
4156 if (TREE_CODE (decl) == FUNCTION_DECL)
4157 return (DECL_INITIAL (decl) != NULL_TREE);
4160 gcc_assert (VAR_P (decl));
4161 return !DECL_EXTERNAL (decl);
4165 /* Nonzero for a VAR_DECL whose value can be used in a constant expression.
4169 An integral constant-expression can only involve ... const
4170 variables of integral or enumeration types initialized with
4171 constant expressions ...
4173 C++0x also allows constexpr variables and temporaries initialized
4174 with constant expressions. We handle the former here, but the latter
4175 are just folded away in cxx_eval_constant_expression.
4177 The standard does not require that the expression be non-volatile.
4178 G++ implements the proposed correction in DR 457. */
4181 decl_constant_var_p (tree decl)
4183 if (!decl_maybe_constant_var_p (decl))
4186 /* We don't know if a template static data member is initialized with
4187 a constant expression until we instantiate its initializer. Even
4188 in the case of a constexpr variable, we can't treat it as a
4189 constant until its initializer is complete in case it's used in
4190 its own initializer. */
4192 return DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl);
4195 /* Returns true if DECL could be a symbolic constant variable, depending on
4199 decl_maybe_constant_var_p (tree decl)
4201 tree type = TREE_TYPE (decl);
4204 if (DECL_DECLARED_CONSTEXPR_P (decl))
4206 if (DECL_HAS_VALUE_EXPR_P (decl))
4207 /* A proxy isn't constant. */
4209 return (CP_TYPE_CONST_NON_VOLATILE_P (type)
4210 && INTEGRAL_OR_ENUMERATION_TYPE_P (type));
4213 /* Complain that DECL uses a type with no linkage. In C++98 mode this is
4214 called from grokfndecl and grokvardecl; in all modes it is called from
4215 cp_write_global_declarations. */
4218 no_linkage_error (tree decl)
4220 if (cxx_dialect >= cxx11 && decl_defined_p (decl))
4221 /* In C++11 it's ok if the decl is defined. */
4223 tree t = no_linkage_check (TREE_TYPE (decl), /*relaxed_p=*/false);
4225 /* The type that got us on no_linkage_decls must have gotten a name for
4226 linkage purposes. */;
4227 else if (CLASS_TYPE_P (t) && TYPE_BEING_DEFINED (t))
4228 /* The type might end up having a typedef name for linkage purposes. */
4229 vec_safe_push (no_linkage_decls, decl);
4230 else if (TYPE_ANONYMOUS_P (t))
4233 if (cxx_dialect >= cxx11)
4234 d = permerror (DECL_SOURCE_LOCATION (decl), "%q#D, declared using "
4235 "anonymous type, is used but never defined", decl);
4236 else if (DECL_EXTERN_C_P (decl))
4237 /* Allow this; it's pretty common in C. */;
4238 else if (TREE_CODE (decl) == VAR_DECL)
4239 /* DRs 132, 319 and 389 seem to indicate types with
4240 no linkage can only be used to declare extern "C"
4241 entities. Since it's not always an error in the
4242 ISO C++ 90 Standard, we only issue a warning. */
4243 d = warning_at (DECL_SOURCE_LOCATION (decl), 0, "anonymous type "
4244 "with no linkage used to declare variable %q#D with "
4247 d = permerror (DECL_SOURCE_LOCATION (decl), "anonymous type with no "
4248 "linkage used to declare function %q#D with linkage",
4250 if (d && is_typedef_decl (TYPE_NAME (t)))
4251 inform (DECL_SOURCE_LOCATION (TYPE_NAME (t)), "%q#D does not refer "
4252 "to the unqualified type, so it is not used for linkage",
4255 else if (cxx_dialect >= cxx11)
4257 if (TREE_CODE (decl) == VAR_DECL || !DECL_PURE_VIRTUAL_P (decl))
4258 permerror (DECL_SOURCE_LOCATION (decl),
4259 "%q#D, declared using local type "
4260 "%qT, is used but never defined", decl, t);
4262 else if (TREE_CODE (decl) == VAR_DECL)
4263 warning_at (DECL_SOURCE_LOCATION (decl), 0, "type %qT with no linkage "
4264 "used to declare variable %q#D with linkage", t, decl);
4266 permerror (DECL_SOURCE_LOCATION (decl), "type %qT with no linkage used "
4267 "to declare function %q#D with linkage", t, decl);
4270 /* Collect declarations from all namespaces relevant to SOURCE_FILE. */
4273 collect_all_refs (const char *source_file)
4275 collect_ada_namespace (global_namespace, source_file);
4278 /* Clear DECL_EXTERNAL for NODE. */
4281 clear_decl_external (struct cgraph_node *node, void * /*data*/)
4283 DECL_EXTERNAL (node->decl) = 0;
4287 /* Build up the function to run dynamic initializers for thread_local
4288 variables in this translation unit and alias the init functions for the
4289 individual variables to it. */
4292 handle_tls_init (void)
4294 tree vars = prune_vars_needing_no_initialization (&tls_aggregates);
4295 if (vars == NULL_TREE)
4298 location_t loc = DECL_SOURCE_LOCATION (TREE_VALUE (vars));
4300 write_out_vars (vars);
4302 tree guard = build_decl (loc, VAR_DECL, get_identifier ("__tls_guard"),
4304 TREE_PUBLIC (guard) = false;
4305 TREE_STATIC (guard) = true;
4306 DECL_ARTIFICIAL (guard) = true;
4307 DECL_IGNORED_P (guard) = true;
4308 TREE_USED (guard) = true;
4309 set_decl_tls_model (guard, decl_default_tls_model (guard));
4310 pushdecl_top_level_and_finish (guard, NULL_TREE);
4312 tree fn = get_local_tls_init_fn ();
4313 start_preparsed_function (fn, NULL_TREE, SF_PRE_PARSED);
4314 tree body = begin_function_body ();
4315 tree if_stmt = begin_if_stmt ();
4316 tree cond = cp_build_unary_op (TRUTH_NOT_EXPR, guard, false,
4317 tf_warning_or_error);
4318 finish_if_stmt_cond (cond, if_stmt);
4319 finish_expr_stmt (cp_build_modify_expr (guard, NOP_EXPR, boolean_true_node,
4320 tf_warning_or_error));
4321 for (; vars; vars = TREE_CHAIN (vars))
4323 tree var = TREE_VALUE (vars);
4324 tree init = TREE_PURPOSE (vars);
4325 one_static_initialization_or_destruction (var, init, true);
4327 #ifdef ASM_OUTPUT_DEF
4328 /* Output init aliases even with -fno-extern-tls-init. */
4329 if (TREE_PUBLIC (var))
4331 tree single_init_fn = get_tls_init_fn (var);
4332 if (single_init_fn == NULL_TREE)
4335 = cgraph_node::get_create (fn)->create_same_body_alias
4336 (single_init_fn, fn);
4337 gcc_assert (alias != NULL);
4342 finish_then_clause (if_stmt);
4343 finish_if_stmt (if_stmt);
4344 finish_function_body (body);
4345 expand_or_defer_fn (finish_function (0));
4348 /* We're at the end of compilation, so generate any mangling aliases that
4349 we've been saving up, if DECL is going to be output and ID2 isn't
4350 already taken by another declaration. */
4353 generate_mangling_alias (tree decl, tree id2)
4355 /* If there's a declaration already using this mangled name,
4356 don't create a compatibility alias that conflicts. */
4357 if (IDENTIFIER_GLOBAL_VALUE (id2))
4360 struct cgraph_node *n = NULL;
4361 if (TREE_CODE (decl) == FUNCTION_DECL
4362 && !(n = cgraph_node::get (decl)))
4363 /* Don't create an alias to an unreferenced function. */
4366 tree alias = make_alias_for (decl, id2);
4367 SET_IDENTIFIER_GLOBAL_VALUE (id2, alias);
4368 DECL_IGNORED_P (alias) = 1;
4369 TREE_PUBLIC (alias) = TREE_PUBLIC (decl);
4370 DECL_VISIBILITY (alias) = DECL_VISIBILITY (decl);
4371 if (vague_linkage_p (decl))
4372 DECL_WEAK (alias) = 1;
4373 if (TREE_CODE (decl) == FUNCTION_DECL)
4374 n->create_same_body_alias (alias, decl);
4376 varpool_node::create_extra_name_alias (alias, decl);
4379 /* Note that we might want to emit an alias with the symbol ID2 for DECL at
4380 the end of translation, for compatibility across bugs in the mangling
4384 note_mangling_alias (tree decl ATTRIBUTE_UNUSED, tree id2 ATTRIBUTE_UNUSED)
4386 #ifdef ASM_OUTPUT_DEF
4387 if (!defer_mangling_aliases)
4388 generate_mangling_alias (decl, id2);
4391 vec_safe_push (mangling_aliases, decl);
4392 vec_safe_push (mangling_aliases, id2);
4397 /* Emit all mangling aliases that were deferred up to this point. */
4400 generate_mangling_aliases ()
4402 while (!vec_safe_is_empty (mangling_aliases))
4404 tree id2 = mangling_aliases->pop();
4405 tree decl = mangling_aliases->pop();
4406 generate_mangling_alias (decl, id2);
4408 defer_mangling_aliases = false;
4411 /* The entire file is now complete. If requested, dump everything
4418 FILE *stream = dump_begin (TDI_tu, &flags);
4422 dump_node (global_namespace, flags & ~TDF_SLIM, stream);
4423 dump_end (TDI_tu, stream);
4427 /* Check the deallocation functions for CODE to see if we want to warn that
4428 only one was defined. */
4431 maybe_warn_sized_delete (enum tree_code code)
4433 tree sized = NULL_TREE;
4434 tree unsized = NULL_TREE;
4436 for (tree ovl = IDENTIFIER_GLOBAL_VALUE (ansi_opname (code));
4437 ovl; ovl = OVL_NEXT (ovl))
4439 tree fn = OVL_CURRENT (ovl);
4440 /* We're only interested in usual deallocation functions. */
4441 if (!non_placement_deallocation_fn_p (fn))
4443 if (FUNCTION_ARG_CHAIN (fn) == void_list_node)
4448 if (DECL_INITIAL (unsized) && !DECL_INITIAL (sized))
4449 warning_at (DECL_SOURCE_LOCATION (unsized), OPT_Wsized_deallocation,
4450 "the program should also define %qD", sized);
4451 else if (!DECL_INITIAL (unsized) && DECL_INITIAL (sized))
4452 warning_at (DECL_SOURCE_LOCATION (sized), OPT_Wsized_deallocation,
4453 "the program should also define %qD", unsized);
4456 /* Check the global deallocation functions to see if we want to warn about
4457 defining unsized without sized (or vice versa). */
4460 maybe_warn_sized_delete ()
4462 if (!flag_sized_deallocation || !warn_sized_deallocation)
4464 maybe_warn_sized_delete (DELETE_EXPR);
4465 maybe_warn_sized_delete (VEC_DELETE_EXPR);
4468 /* This routine is called at the end of compilation.
4469 Its job is to create all the code needed to initialize and
4470 destroy the global aggregates. We do the destruction
4471 first, since that way we only need to reverse the decls once. */
4474 cp_write_global_declarations (void)
4480 unsigned ssdf_count = 0;
4483 hash_set<tree> *candidates;
4485 locus = input_location;
4488 /* Bad parse errors. Just forget about it. */
4489 if (! global_bindings_p () || current_class_type
4490 || !vec_safe_is_empty (decl_namespace_list))
4493 /* This is the point to write out a PCH if we're doing that.
4494 In that case we do not want to do anything else. */
4497 c_common_write_pch ();
4502 symtab->process_same_body_aliases ();
4504 /* Handle -fdump-ada-spec[-slim] */
4505 if (flag_dump_ada_spec || flag_dump_ada_spec_slim)
4507 if (flag_dump_ada_spec_slim)
4508 collect_source_ref (main_input_filename);
4510 collect_source_refs (global_namespace);
4512 dump_ada_specs (collect_all_refs, cpp_check);
4515 /* FIXME - huh? was input_line -= 1;*/
4517 timevar_start (TV_PHASE_DEFERRED);
4519 /* We now have to write out all the stuff we put off writing out.
4522 o Template specializations that we have not yet instantiated,
4523 but which are needed.
4524 o Initialization and destruction for non-local objects with
4525 static storage duration. (Local objects with static storage
4526 duration are initialized when their scope is first entered,
4527 and are cleaned up via atexit.)
4528 o Virtual function tables.
4530 All of these may cause others to be needed. For example,
4531 instantiating one function may cause another to be needed, and
4532 generating the initializer for an object may cause templates to be
4533 instantiated, etc., etc. */
4535 emit_support_tinfos ();
4544 /* If there are templates that we've put off instantiating, do
4546 instantiate_pending_templates (retries);
4549 /* Write out virtual tables as required. Note that writing out
4550 the virtual table for a template class may cause the
4551 instantiation of members of that class. If we write out
4552 vtables then we remove the class from our list so we don't
4553 have to look at it again. */
4555 while (keyed_classes != NULL_TREE
4556 && maybe_emit_vtables (TREE_VALUE (keyed_classes)))
4559 keyed_classes = TREE_CHAIN (keyed_classes);
4565 tree next = TREE_CHAIN (t);
4569 if (maybe_emit_vtables (TREE_VALUE (next)))
4572 TREE_CHAIN (t) = TREE_CHAIN (next);
4577 next = TREE_CHAIN (t);
4581 /* Write out needed type info variables. We have to be careful
4582 looping through unemitted decls, because emit_tinfo_decl may
4583 cause other variables to be needed. New elements will be
4584 appended, and we remove from the vector those that actually
4586 for (i = unemitted_tinfo_decls->length ();
4587 unemitted_tinfo_decls->iterate (--i, &t);)
4588 if (emit_tinfo_decl (t))
4591 unemitted_tinfo_decls->unordered_remove (i);
4594 /* The list of objects with static storage duration is built up
4595 in reverse order. We clear STATIC_AGGREGATES so that any new
4596 aggregates added during the initialization of these will be
4597 initialized in the correct order when we next come around the
4599 vars = prune_vars_needing_no_initialization (&static_aggregates);
4603 /* We need to start a new initialization function each time
4604 through the loop. That's because we need to know which
4605 vtables have been referenced, and TREE_SYMBOL_REFERENCED
4606 isn't computed until a function is finished, and written
4607 out. That's a deficiency in the back end. When this is
4608 fixed, these initialization functions could all become
4609 inline, with resulting performance improvements. */
4612 /* Set the line and file, so that it is obviously not from
4614 input_location = locus;
4615 ssdf_body = start_static_storage_duration_function (ssdf_count);
4617 /* Make sure the back end knows about all the variables. */
4618 write_out_vars (vars);
4620 /* First generate code to do all the initializations. */
4622 do_static_initialization_or_destruction (vars, /*initp=*/true);
4624 /* Then, generate code to do all the destructions. Do these
4625 in reverse order so that the most recently constructed
4626 variable is the first destroyed. If we're using
4627 __cxa_atexit, then we don't need to do this; functions
4628 were registered at initialization time to destroy the
4630 if (!flag_use_cxa_atexit && vars)
4632 vars = nreverse (vars);
4633 do_static_initialization_or_destruction (vars, /*initp=*/false);
4638 /* Finish up the static storage duration function for this
4640 input_location = locus;
4641 finish_static_storage_duration_function (ssdf_body);
4643 /* All those initializations and finalizations might cause
4644 us to need more inline functions, more template
4645 instantiations, etc. */
4648 /* ??? was: locus.line++; */
4651 /* Now do the same for thread_local variables. */
4654 /* Go through the set of inline functions whose bodies have not
4655 been emitted yet. If out-of-line copies of these functions
4656 are required, emit them. */
4657 FOR_EACH_VEC_SAFE_ELT (deferred_fns, i, decl)
4659 /* Does it need synthesizing? */
4660 if (DECL_DEFAULTED_FN (decl) && ! DECL_INITIAL (decl)
4661 && (! DECL_REALLY_EXTERN (decl) || possibly_inlined_p (decl)))
4663 /* Even though we're already at the top-level, we push
4664 there again. That way, when we pop back a few lines
4665 hence, all of our state is restored. Otherwise,
4666 finish_function doesn't clean things up, and we end
4667 up with CURRENT_FUNCTION_DECL set. */
4668 push_to_top_level ();
4669 /* The decl's location will mark where it was first
4670 needed. Save that so synthesize method can indicate
4671 where it was needed from, in case of error */
4672 input_location = DECL_SOURCE_LOCATION (decl);
4673 synthesize_method (decl);
4674 pop_from_top_level ();
4678 if (!DECL_INITIAL (decl) && decl_tls_wrapper_p (decl))
4679 generate_tls_wrapper (decl);
4681 if (!DECL_SAVED_TREE (decl))
4684 /* We lie to the back end, pretending that some functions
4685 are not defined when they really are. This keeps these
4686 functions from being put out unnecessarily. But, we must
4687 stop lying when the functions are referenced, or if they
4688 are not comdat since they need to be put out now. If
4689 DECL_INTERFACE_KNOWN, then we have already set
4690 DECL_EXTERNAL appropriately, so there's no need to check
4691 again, and we do not want to clear DECL_EXTERNAL if a
4692 previous call to import_export_decl set it.
4694 This is done in a separate for cycle, because if some
4695 deferred function is contained in another deferred
4696 function later in deferred_fns varray,
4697 rest_of_compilation would skip this function and we
4698 really cannot expand the same function twice. */
4699 import_export_decl (decl);
4700 if (DECL_NOT_REALLY_EXTERN (decl)
4701 && DECL_INITIAL (decl)
4702 && decl_needed_p (decl))
4704 struct cgraph_node *node, *next;
4706 node = cgraph_node::get (decl);
4707 if (node->cpp_implicit_alias)
4708 node = node->get_alias_target ();
4710 node->call_for_symbol_thunks_and_aliases (clear_decl_external,
4712 /* If we mark !DECL_EXTERNAL one of the symbols in some comdat
4713 group, we need to mark all symbols in the same comdat group
4715 if (node->same_comdat_group)
4716 for (next = dyn_cast<cgraph_node *> (node->same_comdat_group);
4718 next = dyn_cast<cgraph_node *> (next->same_comdat_group))
4719 next->call_for_symbol_thunks_and_aliases (clear_decl_external,
4723 /* If we're going to need to write this function out, and
4724 there's already a body for it, create RTL for it now.
4725 (There might be no body if this is a method we haven't
4726 gotten around to synthesizing yet.) */
4727 if (!DECL_EXTERNAL (decl)
4728 && decl_needed_p (decl)
4729 && !TREE_ASM_WRITTEN (decl)
4730 && !cgraph_node::get (decl)->definition)
4732 /* We will output the function; no longer consider it in this
4734 DECL_DEFER_OUTPUT (decl) = 0;
4735 /* Generate RTL for this function now that we know we
4737 expand_or_defer_fn (decl);
4738 /* If we're compiling -fsyntax-only pretend that this
4739 function has been written out so that we don't try to
4741 if (flag_syntax_only)
4742 TREE_ASM_WRITTEN (decl) = 1;
4747 if (walk_namespaces (wrapup_globals_for_namespace, /*data=*/0))
4750 /* Static data members are just like namespace-scope globals. */
4751 FOR_EACH_VEC_SAFE_ELT (pending_statics, i, decl)
4753 if (var_finalized_p (decl) || DECL_REALLY_EXTERN (decl)
4754 /* Don't write it out if we haven't seen a definition. */
4755 || DECL_IN_AGGR_P (decl))
4757 import_export_decl (decl);
4758 /* If this static data member is needed, provide it to the
4760 if (DECL_NOT_REALLY_EXTERN (decl) && decl_needed_p (decl))
4761 DECL_EXTERNAL (decl) = 0;
4763 if (vec_safe_length (pending_statics) != 0
4764 && wrapup_global_declarations (pending_statics->address (),
4765 pending_statics->length ()))
4772 generate_mangling_aliases ();
4774 /* All used inline functions must have a definition at this point. */
4775 FOR_EACH_VEC_SAFE_ELT (deferred_fns, i, decl)
4777 if (/* Check online inline functions that were actually used. */
4778 DECL_ODR_USED (decl) && DECL_DECLARED_INLINE_P (decl)
4779 /* If the definition actually was available here, then the
4780 fact that the function was not defined merely represents
4781 that for some reason (use of a template repository,
4782 #pragma interface, etc.) we decided not to emit the
4784 && !DECL_INITIAL (decl)
4785 /* Don't complain if the template was defined. */
4786 && !(DECL_TEMPLATE_INSTANTIATION (decl)
4787 && DECL_INITIAL (DECL_TEMPLATE_RESULT
4788 (template_for_substitution (decl)))))
4790 warning (0, "inline function %q+D used but never defined", decl);
4791 /* Avoid a duplicate warning from check_global_declaration_1. */
4792 TREE_NO_WARNING (decl) = 1;
4796 /* So must decls that use a type with no linkage. */
4797 FOR_EACH_VEC_SAFE_ELT (no_linkage_decls, i, decl)
4798 no_linkage_error (decl);
4800 maybe_warn_sized_delete ();
4802 /* Then, do the Objective-C stuff. This is where all the
4803 Objective-C module stuff gets generated (symtab,
4804 class/protocol/selector lists etc). This must be done after C++
4805 templates, destructors etc. so that selectors used in C++
4806 templates are properly allocated. */
4807 if (c_dialect_objc ())
4808 objc_write_global_declarations ();
4810 /* We give C linkage to static constructors and destructors. */
4811 push_lang_context (lang_name_c);
4813 /* Generate initialization and destruction functions for all
4814 priorities for which they are required. */
4815 if (priority_info_map)
4816 splay_tree_foreach (priority_info_map,
4817 generate_ctor_and_dtor_functions_for_priority,
4819 else if (c_dialect_objc () && objc_static_init_needed_p ())
4820 /* If this is obj-c++ and we need a static init, call
4821 generate_ctor_or_dtor_function. */
4822 generate_ctor_or_dtor_function (/*constructor_p=*/true,
4823 DEFAULT_INIT_PRIORITY, &locus);
4825 /* We're done with the splay-tree now. */
4826 if (priority_info_map)
4827 splay_tree_delete (priority_info_map);
4829 /* Generate any missing aliases. */
4830 maybe_apply_pending_pragma_weaks ();
4832 /* We're done with static constructors, so we can go back to "C++"
4834 pop_lang_context ();
4836 /* Collect candidates for Java hidden aliases. */
4837 candidates = collect_candidates_for_java_method_aliases ();
4839 timevar_stop (TV_PHASE_DEFERRED);
4840 timevar_start (TV_PHASE_OPT_GEN);
4842 if (flag_vtable_verify)
4844 vtv_recover_class_info ();
4845 vtv_compute_class_hierarchy_transitive_closure ();
4846 vtv_build_vtable_verify_fndecl ();
4849 symtab->finalize_compilation_unit ();
4851 if (flag_vtable_verify)
4853 /* Generate the special constructor initialization function that
4854 calls __VLTRegisterPairs, and give it a very high
4855 initialization priority. This must be done after
4856 finalize_compilation_unit so that we have accurate
4857 information about which vtable will actually be emitted. */
4858 vtv_generate_init_routine ();
4861 timevar_stop (TV_PHASE_OPT_GEN);
4862 timevar_start (TV_PHASE_CHECK_DBGINFO);
4864 /* Now, issue warnings about static, but not defined, functions,
4865 etc., and emit debugging information. */
4866 walk_namespaces (wrapup_globals_for_namespace, /*data=*/&reconsider);
4867 if (vec_safe_length (pending_statics) != 0)
4869 check_global_declarations (pending_statics->address (),
4870 pending_statics->length ());
4871 emit_debug_global_declarations (pending_statics->address (),
4872 pending_statics->length ());
4875 perform_deferred_noexcept_checks ();
4877 /* Generate hidden aliases for Java. */
4880 build_java_method_aliases (candidates);
4886 /* The entire file is now complete. If requested, dump everything
4890 if (flag_detailed_statistics)
4892 dump_tree_statistics ();
4893 dump_time_statistics ();
4895 input_location = locus;
4897 #ifdef ENABLE_CHECKING
4898 validate_conversion_obstack ();
4899 #endif /* ENABLE_CHECKING */
4901 timevar_stop (TV_PHASE_CHECK_DBGINFO);
4904 /* FN is an OFFSET_REF, DOTSTAR_EXPR or MEMBER_REF indicating the
4905 function to call in parse-tree form; it has not yet been
4906 semantically analyzed. ARGS are the arguments to the function.
4907 They have already been semantically analyzed. This may change
4911 build_offset_ref_call_from_tree (tree fn, vec<tree, va_gc> **args,
4912 tsubst_flags_t complain)
4915 vec<tree, va_gc> *orig_args = NULL;
4920 object = TREE_OPERAND (fn, 0);
4922 if (processing_template_decl)
4924 gcc_assert (TREE_CODE (fn) == DOTSTAR_EXPR
4925 || TREE_CODE (fn) == MEMBER_REF);
4926 if (type_dependent_expression_p (fn)
4927 || any_type_dependent_arguments_p (*args))
4928 return build_nt_call_vec (fn, *args);
4930 orig_args = make_tree_vector_copy (*args);
4932 /* Transform the arguments and add the implicit "this"
4933 parameter. That must be done before the FN is transformed
4934 because we depend on the form of FN. */
4935 make_args_non_dependent (*args);
4936 object = build_non_dependent_expr (object);
4937 if (TREE_CODE (TREE_TYPE (fn)) == METHOD_TYPE)
4939 if (TREE_CODE (fn) == DOTSTAR_EXPR)
4940 object = cp_build_addr_expr (object, complain);
4941 vec_safe_insert (*args, 0, object);
4943 /* Now that the arguments are done, transform FN. */
4944 fn = build_non_dependent_expr (fn);
4947 /* A qualified name corresponding to a bound pointer-to-member is
4948 represented as an OFFSET_REF:
4950 struct B { void g(); };
4952 void B::g() { (this->*p)(); } */
4953 if (TREE_CODE (fn) == OFFSET_REF)
4955 tree object_addr = cp_build_addr_expr (object, complain);
4956 fn = TREE_OPERAND (fn, 1);
4957 fn = get_member_function_from_ptrfunc (&object_addr, fn,
4959 vec_safe_insert (*args, 0, object_addr);
4962 if (CLASS_TYPE_P (TREE_TYPE (fn)))
4963 expr = build_op_call (fn, args, complain);
4965 expr = cp_build_function_call_vec (fn, args, complain);
4966 if (processing_template_decl && expr != error_mark_node)
4967 expr = build_min_non_dep_call_vec (expr, orig_fn, orig_args);
4969 if (orig_args != NULL)
4970 release_tree_vector (orig_args);
4977 check_default_args (tree x)
4979 tree arg = TYPE_ARG_TYPES (TREE_TYPE (x));
4980 bool saw_def = false;
4981 int i = 0 - (TREE_CODE (TREE_TYPE (x)) == METHOD_TYPE);
4982 for (; arg && arg != void_list_node; arg = TREE_CHAIN (arg), ++i)
4984 if (TREE_PURPOSE (arg))
4986 else if (saw_def && !PACK_EXPANSION_P (TREE_VALUE (arg)))
4988 error ("default argument missing for parameter %P of %q+#D", i, x);
4989 TREE_PURPOSE (arg) = error_mark_node;
4994 /* Return true if function DECL can be inlined. This is used to force
4995 instantiation of methods that might be interesting for inlining. */
4997 possibly_inlined_p (tree decl)
4999 gcc_assert (TREE_CODE (decl) == FUNCTION_DECL);
5000 if (DECL_UNINLINABLE (decl))
5002 if (!optimize || pragma_java_exceptions)
5003 return DECL_DECLARED_INLINE_P (decl);
5004 /* When optimizing, we might inline everything when flatten
5005 attribute or heuristics inlining for size or autoinlining
5010 /* Mark DECL (either a _DECL or a BASELINK) as "used" in the program.
5011 If DECL is a specialization or implicitly declared class member,
5012 generate the actual definition. Return false if something goes
5013 wrong, true otherwise. */
5016 mark_used (tree decl, tsubst_flags_t complain)
5018 /* If DECL is a BASELINK for a single function, then treat it just
5019 like the DECL for the function. Otherwise, if the BASELINK is
5020 for an overloaded function, we don't know which function was
5021 actually used until after overload resolution. */
5022 if (BASELINK_P (decl))
5024 decl = BASELINK_FUNCTIONS (decl);
5025 if (really_overloaded_fn (decl))
5027 decl = OVL_CURRENT (decl);
5030 /* Set TREE_USED for the benefit of -Wunused. */
5031 TREE_USED (decl) = 1;
5032 if (DECL_CLONED_FUNCTION_P (decl))
5033 TREE_USED (DECL_CLONED_FUNCTION (decl)) = 1;
5035 /* Mark enumeration types as used. */
5036 if (TREE_CODE (decl) == CONST_DECL)
5037 used_types_insert (DECL_CONTEXT (decl));
5039 if (TREE_CODE (decl) == FUNCTION_DECL)
5040 maybe_instantiate_noexcept (decl);
5042 if (TREE_CODE (decl) == FUNCTION_DECL
5043 && DECL_DELETED_FN (decl))
5045 if (DECL_ARTIFICIAL (decl))
5047 if (DECL_OVERLOADED_OPERATOR_P (decl) == TYPE_EXPR
5048 && LAMBDA_TYPE_P (DECL_CONTEXT (decl)))
5050 /* We mark a lambda conversion op as deleted if we can't
5051 generate it properly; see maybe_add_lambda_conv_op. */
5052 sorry ("converting lambda which uses %<...%> to "
5053 "function pointer");
5057 if (complain & tf_error)
5059 error ("use of deleted function %qD", decl);
5060 if (!maybe_explain_implicit_delete (decl))
5061 inform (DECL_SOURCE_LOCATION (decl), "declared here");
5066 if (TREE_DEPRECATED (decl) && (complain & tf_warning)
5067 && deprecated_state != DEPRECATED_SUPPRESS)
5068 warn_deprecated_use (decl, NULL_TREE);
5070 /* We can only check DECL_ODR_USED on variables or functions with
5071 DECL_LANG_SPECIFIC set, and these are also the only decls that we
5072 might need special handling for. */
5073 if (!VAR_OR_FUNCTION_DECL_P (decl)
5074 || DECL_LANG_SPECIFIC (decl) == NULL
5075 || DECL_THUNK_P (decl))
5077 if (!processing_template_decl && type_uses_auto (TREE_TYPE (decl)))
5079 if (complain & tf_error)
5080 error ("use of %qD before deduction of %<auto%>", decl);
5086 /* We only want to do this processing once. We don't need to keep trying
5087 to instantiate inline templates, because unit-at-a-time will make sure
5088 we get them compiled before functions that want to inline them. */
5089 if (DECL_ODR_USED (decl))
5092 /* If within finish_function, defer the rest until that function
5093 finishes, otherwise it might recurse. */
5094 if (defer_mark_used_calls)
5096 vec_safe_push (deferred_mark_used_calls, decl);
5100 /* Normally, we can wait until instantiation-time to synthesize DECL.
5101 However, if DECL is a static data member initialized with a constant
5102 or a constexpr function, we need it right now because a reference to
5103 such a data member or a call to such function is not value-dependent.
5104 For a function that uses auto in the return type, we need to instantiate
5105 it to find out its type. For OpenMP user defined reductions, we need
5106 them instantiated for reduction clauses which inline them by hand
5108 if (DECL_LANG_SPECIFIC (decl)
5109 && DECL_TEMPLATE_INFO (decl)
5110 && (decl_maybe_constant_var_p (decl)
5111 || (TREE_CODE (decl) == FUNCTION_DECL
5112 && DECL_OMP_DECLARE_REDUCTION_P (decl))
5113 || undeduced_auto_decl (decl))
5114 && !uses_template_parms (DECL_TI_ARGS (decl)))
5116 /* Instantiating a function will result in garbage collection. We
5117 must treat this situation as if we were within the body of a
5118 function so as to avoid collecting live data only referenced from
5119 the stack (such as overload resolution candidates). */
5121 instantiate_decl (decl, /*defer_ok=*/false,
5122 /*expl_inst_class_mem_p=*/false);
5126 if (processing_template_decl || in_template_function ())
5129 /* Check this too in case we're within instantiate_non_dependent_expr. */
5130 if (DECL_TEMPLATE_INFO (decl)
5131 && uses_template_parms (DECL_TI_ARGS (decl)))
5134 if (undeduced_auto_decl (decl))
5136 if (complain & tf_error)
5137 error ("use of %qD before deduction of %<auto%>", decl);
5141 /* If we don't need a value, then we don't need to synthesize DECL. */
5142 if (cp_unevaluated_operand != 0)
5145 DECL_ODR_USED (decl) = 1;
5146 if (DECL_CLONED_FUNCTION_P (decl))
5147 DECL_ODR_USED (DECL_CLONED_FUNCTION (decl)) = 1;
5149 /* DR 757: A type without linkage shall not be used as the type of a
5150 variable or function with linkage, unless
5151 o the variable or function has extern "C" linkage (7.5 [dcl.link]), or
5152 o the variable or function is not used (3.2 [basic.def.odr]) or is
5153 defined in the same translation unit. */
5154 if (cxx_dialect > cxx98
5155 && decl_linkage (decl) != lk_none
5156 && !DECL_EXTERN_C_P (decl)
5157 && !DECL_ARTIFICIAL (decl)
5158 && !decl_defined_p (decl)
5159 && no_linkage_check (TREE_TYPE (decl), /*relaxed_p=*/false))
5161 if (is_local_extern (decl))
5162 /* There's no way to define a local extern, and adding it to
5163 the vector interferes with GC, so give an error now. */
5164 no_linkage_error (decl);
5166 vec_safe_push (no_linkage_decls, decl);
5169 if (TREE_CODE (decl) == FUNCTION_DECL && DECL_DECLARED_INLINE_P (decl)
5170 && !DECL_INITIAL (decl) && !DECL_ARTIFICIAL (decl))
5171 /* Remember it, so we can check it was defined. */
5172 note_vague_linkage_fn (decl);
5174 /* Is it a synthesized method that needs to be synthesized? */
5175 if (TREE_CODE (decl) == FUNCTION_DECL
5176 && DECL_NONSTATIC_MEMBER_FUNCTION_P (decl)
5177 && DECL_DEFAULTED_FN (decl)
5178 /* A function defaulted outside the class is synthesized either by
5179 cp_finish_decl or instantiate_decl. */
5180 && !DECL_DEFAULTED_OUTSIDE_CLASS_P (decl)
5181 && ! DECL_INITIAL (decl))
5183 /* Defer virtual destructors so that thunks get the right
5185 if (DECL_VIRTUAL_P (decl) && !at_eof)
5187 note_vague_linkage_fn (decl);
5191 /* Remember the current location for a function we will end up
5192 synthesizing. Then we can inform the user where it was
5193 required in the case of error. */
5194 DECL_SOURCE_LOCATION (decl) = input_location;
5196 /* Synthesizing an implicitly defined member function will result in
5197 garbage collection. We must treat this situation as if we were
5198 within the body of a function so as to avoid collecting live data
5199 on the stack (such as overload resolution candidates).
5201 We could just let cp_write_global_declarations handle synthesizing
5202 this function by adding it to deferred_fns, but doing
5203 it at the use site produces better error messages. */
5205 synthesize_method (decl);
5207 /* If this is a synthesized method we don't need to
5208 do the instantiation test below. */
5210 else if (VAR_OR_FUNCTION_DECL_P (decl)
5211 && DECL_TEMPLATE_INFO (decl)
5212 && (!DECL_EXPLICIT_INSTANTIATION (decl)
5213 || always_instantiate_p (decl)))
5214 /* If this is a function or variable that is an instance of some
5215 template, we now know that we will need to actually do the
5216 instantiation. We check that DECL is not an explicit
5217 instantiation because that is not checked in instantiate_decl.
5219 We put off instantiating functions in order to improve compile
5220 times. Maintaining a stack of active functions is expensive,
5221 and the inliner knows to instantiate any functions it might
5222 need. Therefore, we always try to defer instantiation. */
5225 instantiate_decl (decl, /*defer_ok=*/true,
5226 /*expl_inst_class_mem_p=*/false);
5234 mark_used (tree decl)
5236 return mark_used (decl, tf_warning_or_error);
5240 vtv_start_verification_constructor_init_function (void)
5242 return start_objects ('I', MAX_RESERVED_INIT_PRIORITY - 1);
5246 vtv_finish_verification_constructor_init_function (tree function_body)
5250 finish_compound_stmt (function_body);
5251 fn = finish_function (0);
5252 DECL_STATIC_CONSTRUCTOR (fn) = 1;
5253 decl_init_priority_insert (fn, MAX_RESERVED_INIT_PRIORITY - 1);
5258 #include "gt-cp-decl2.h"