1 /* Process declarations and variables for C++ compiler.
2 Copyright (C) 1988-2016 Free Software Foundation, Inc.
3 Hacked by Michael Tiemann (tiemann@cygnus.com)
5 This file is part of GCC.
7 GCC is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3, or (at your option)
12 GCC is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with GCC; see the file COPYING3. If not see
19 <http://www.gnu.org/licenses/>. */
22 /* Process declarations and symbol lookup for C++ front end.
23 Also constructs types; the standard scalar types at initialization,
24 and structure, union, array and enum types when they are declared. */
26 /* ??? not all decl nodes are given the most useful possible
27 line numbers. For example, the CONST_DECLs for enum values. */
31 #include "coretypes.h"
35 #include "c-family/c-common.h"
37 #include "stringpool.h"
41 #include "stor-layout.h"
45 #include "c-family/c-objc.h"
46 #include "c-family/c-pragma.h"
49 #include "c-family/c-ada-spec.h"
52 extern cpp_reader
*parse_in
;
54 /* This structure contains information about the initializations
55 and/or destructions required for a particular priority level. */
56 typedef struct priority_info_s
{
57 /* Nonzero if there have been any initializations at this priority
58 throughout the translation unit. */
59 int initializations_p
;
60 /* Nonzero if there have been any destructions at this priority
61 throughout the translation unit. */
65 static void mark_vtable_entries (tree
);
66 static bool maybe_emit_vtables (tree
);
67 static tree
start_objects (int, int);
68 static void finish_objects (int, int, tree
);
69 static tree
start_static_storage_duration_function (unsigned);
70 static void finish_static_storage_duration_function (tree
);
71 static priority_info
get_priority_info (int);
72 static void do_static_initialization_or_destruction (tree
, bool);
73 static void one_static_initialization_or_destruction (tree
, tree
, bool);
74 static void generate_ctor_or_dtor_function (bool, int, location_t
*);
75 static int generate_ctor_and_dtor_functions_for_priority (splay_tree_node
,
77 static tree
prune_vars_needing_no_initialization (tree
*);
78 static void write_out_vars (tree
);
79 static void import_export_class (tree
);
80 static tree
get_guard_bits (tree
);
81 static void determine_visibility_from_class (tree
, tree
);
82 static bool determine_hidden_inline (tree
);
83 static bool decl_defined_p (tree
);
84 static void maybe_instantiate_decl (tree
);
86 /* A list of static class variables. This is needed, because a
87 static class variable can be declared inside the class without
88 an initializer, and then initialized, statically, outside the class. */
89 static GTY(()) vec
<tree
, va_gc
> *pending_statics
;
91 /* A list of functions which were declared inline, but which we
92 may need to emit outline anyway. */
93 static GTY(()) vec
<tree
, va_gc
> *deferred_fns
;
95 /* A list of decls that use types with no linkage, which we need to make
97 static GTY(()) vec
<tree
, va_gc
> *no_linkage_decls
;
99 /* A vector of alternating decls and identifiers, where the latter
100 is to be an alias for the former if the former is defined. */
101 static GTY(()) vec
<tree
, va_gc
> *mangling_aliases
;
103 /* Nonzero if we're done parsing and into end-of-file activities. */
107 /* True if note_mangling_alias should enqueue mangling aliases for
108 later generation, rather than emitting them right away. */
110 bool defer_mangling_aliases
= true;
113 /* Return a member function type (a METHOD_TYPE), given FNTYPE (a
114 FUNCTION_TYPE), CTYPE (class type), and QUALS (the cv-qualifiers
115 that apply to the function). */
118 build_memfn_type (tree fntype
, tree ctype
, cp_cv_quals quals
,
119 cp_ref_qualifier rqual
)
124 bool late_return_type_p
;
126 if (fntype
== error_mark_node
|| ctype
== error_mark_node
)
127 return error_mark_node
;
129 gcc_assert (TREE_CODE (fntype
) == FUNCTION_TYPE
130 || TREE_CODE (fntype
) == METHOD_TYPE
);
132 type_quals
= quals
& ~TYPE_QUAL_RESTRICT
;
133 ctype
= cp_build_qualified_type (ctype
, type_quals
);
134 raises
= TYPE_RAISES_EXCEPTIONS (fntype
);
135 attrs
= TYPE_ATTRIBUTES (fntype
);
136 late_return_type_p
= TYPE_HAS_LATE_RETURN_TYPE (fntype
);
137 fntype
= build_method_type_directly (ctype
, TREE_TYPE (fntype
),
138 (TREE_CODE (fntype
) == METHOD_TYPE
139 ? TREE_CHAIN (TYPE_ARG_TYPES (fntype
))
140 : TYPE_ARG_TYPES (fntype
)));
142 fntype
= cp_build_type_attribute_variant (fntype
, attrs
);
144 fntype
= build_ref_qualified_type (fntype
, rqual
);
146 fntype
= build_exception_variant (fntype
, raises
);
147 if (late_return_type_p
)
148 TYPE_HAS_LATE_RETURN_TYPE (fntype
) = 1;
153 /* Return a variant of FNTYPE, a FUNCTION_TYPE or METHOD_TYPE, with its
154 return type changed to NEW_RET. */
157 change_return_type (tree new_ret
, tree fntype
)
160 tree args
= TYPE_ARG_TYPES (fntype
);
161 tree raises
= TYPE_RAISES_EXCEPTIONS (fntype
);
162 tree attrs
= TYPE_ATTRIBUTES (fntype
);
163 bool late_return_type_p
= TYPE_HAS_LATE_RETURN_TYPE (fntype
);
165 if (new_ret
== error_mark_node
)
168 if (same_type_p (new_ret
, TREE_TYPE (fntype
)))
171 if (TREE_CODE (fntype
) == FUNCTION_TYPE
)
173 newtype
= build_function_type (new_ret
, args
);
174 newtype
= apply_memfn_quals (newtype
,
175 type_memfn_quals (fntype
),
176 type_memfn_rqual (fntype
));
179 newtype
= build_method_type_directly
180 (class_of_this_parm (fntype
), new_ret
, TREE_CHAIN (args
));
181 if (FUNCTION_REF_QUALIFIED (fntype
))
182 newtype
= build_ref_qualified_type (newtype
, type_memfn_rqual (fntype
));
184 newtype
= build_exception_variant (newtype
, raises
);
186 newtype
= cp_build_type_attribute_variant (newtype
, attrs
);
187 if (late_return_type_p
)
188 TYPE_HAS_LATE_RETURN_TYPE (newtype
) = 1;
193 /* Build a PARM_DECL with NAME and TYPE, and set DECL_ARG_TYPE
197 cp_build_parm_decl (tree name
, tree type
)
199 tree parm
= build_decl (input_location
,
200 PARM_DECL
, name
, type
);
201 /* DECL_ARG_TYPE is only used by the back end and the back end never
203 if (!processing_template_decl
)
204 DECL_ARG_TYPE (parm
) = type_passed_as (type
);
209 /* Returns a PARM_DECL for a parameter of the indicated TYPE, with the
213 build_artificial_parm (tree name
, tree type
)
215 tree parm
= cp_build_parm_decl (name
, type
);
216 DECL_ARTIFICIAL (parm
) = 1;
217 /* All our artificial parms are implicitly `const'; they cannot be
219 TREE_READONLY (parm
) = 1;
223 /* Constructors for types with virtual baseclasses need an "in-charge" flag
224 saying whether this constructor is responsible for initialization of
225 virtual baseclasses or not. All destructors also need this "in-charge"
226 flag, which additionally determines whether or not the destructor should
227 free the memory for the object.
229 This function adds the "in-charge" flag to member function FN if
230 appropriate. It is called from grokclassfn and tsubst.
231 FN must be either a constructor or destructor.
233 The in-charge flag follows the 'this' parameter, and is followed by the
234 VTT parm (if any), then the user-written parms. */
237 maybe_retrofit_in_chrg (tree fn
)
239 tree basetype
, arg_types
, parms
, parm
, fntype
;
241 /* If we've already add the in-charge parameter don't do it again. */
242 if (DECL_HAS_IN_CHARGE_PARM_P (fn
))
245 /* When processing templates we can't know, in general, whether or
246 not we're going to have virtual baseclasses. */
247 if (processing_template_decl
)
250 /* We don't need an in-charge parameter for constructors that don't
251 have virtual bases. */
252 if (DECL_CONSTRUCTOR_P (fn
)
253 && !CLASSTYPE_VBASECLASSES (DECL_CONTEXT (fn
)))
256 arg_types
= TYPE_ARG_TYPES (TREE_TYPE (fn
));
257 basetype
= TREE_TYPE (TREE_VALUE (arg_types
));
258 arg_types
= TREE_CHAIN (arg_types
);
260 parms
= DECL_CHAIN (DECL_ARGUMENTS (fn
));
262 /* If this is a subobject constructor or destructor, our caller will
263 pass us a pointer to our VTT. */
264 if (CLASSTYPE_VBASECLASSES (DECL_CONTEXT (fn
)))
266 parm
= build_artificial_parm (vtt_parm_identifier
, vtt_parm_type
);
268 /* First add it to DECL_ARGUMENTS between 'this' and the real args... */
269 DECL_CHAIN (parm
) = parms
;
272 /* ...and then to TYPE_ARG_TYPES. */
273 arg_types
= hash_tree_chain (vtt_parm_type
, arg_types
);
275 DECL_HAS_VTT_PARM_P (fn
) = 1;
278 /* Then add the in-charge parm (before the VTT parm). */
279 parm
= build_artificial_parm (in_charge_identifier
, integer_type_node
);
280 DECL_CHAIN (parm
) = parms
;
282 arg_types
= hash_tree_chain (integer_type_node
, arg_types
);
284 /* Insert our new parameter(s) into the list. */
285 DECL_CHAIN (DECL_ARGUMENTS (fn
)) = parms
;
287 /* And rebuild the function type. */
288 fntype
= build_method_type_directly (basetype
, TREE_TYPE (TREE_TYPE (fn
)),
290 if (TYPE_RAISES_EXCEPTIONS (TREE_TYPE (fn
)))
291 fntype
= build_exception_variant (fntype
,
292 TYPE_RAISES_EXCEPTIONS (TREE_TYPE (fn
)));
293 if (TYPE_ATTRIBUTES (TREE_TYPE (fn
)))
294 fntype
= (cp_build_type_attribute_variant
295 (fntype
, TYPE_ATTRIBUTES (TREE_TYPE (fn
))));
296 TREE_TYPE (fn
) = fntype
;
298 /* Now we've got the in-charge parameter. */
299 DECL_HAS_IN_CHARGE_PARM_P (fn
) = 1;
302 /* Classes overload their constituent function names automatically.
303 When a function name is declared in a record structure,
304 its name is changed to it overloaded name. Since names for
305 constructors and destructors can conflict, we place a leading
308 CNAME is the name of the class we are grokking for.
310 FUNCTION is a FUNCTION_DECL. It was created by `grokdeclarator'.
312 FLAGS contains bits saying what's special about today's
313 arguments. DTOR_FLAG == DESTRUCTOR.
315 If FUNCTION is a destructor, then we must add the `auto-delete' field
316 as a second parameter. There is some hair associated with the fact
317 that we must "declare" this variable in the manner consistent with the
318 way the rest of the arguments were declared.
320 QUALS are the qualifiers for the this pointer. */
323 grokclassfn (tree ctype
, tree function
, enum overload_flags flags
)
325 tree fn_name
= DECL_NAME (function
);
327 /* Even within an `extern "C"' block, members get C++ linkage. See
328 [dcl.link] for details. */
329 SET_DECL_LANGUAGE (function
, lang_cplusplus
);
331 if (fn_name
== NULL_TREE
)
333 error ("name missing for member function");
334 fn_name
= get_identifier ("<anonymous>");
335 DECL_NAME (function
) = fn_name
;
338 DECL_CONTEXT (function
) = ctype
;
340 if (flags
== DTOR_FLAG
)
341 DECL_DESTRUCTOR_P (function
) = 1;
343 if (flags
== DTOR_FLAG
|| DECL_CONSTRUCTOR_P (function
))
344 maybe_retrofit_in_chrg (function
);
347 /* Create an ARRAY_REF, checking for the user doing things backwards
348 along the way. DECLTYPE_P is for N3276, as in the parser. */
351 grok_array_decl (location_t loc
, tree array_expr
, tree index_exp
,
356 tree orig_array_expr
= array_expr
;
357 tree orig_index_exp
= index_exp
;
358 tree overload
= NULL_TREE
;
360 if (error_operand_p (array_expr
) || error_operand_p (index_exp
))
361 return error_mark_node
;
363 if (processing_template_decl
)
365 if (type_dependent_expression_p (array_expr
)
366 || type_dependent_expression_p (index_exp
))
367 return build_min_nt_loc (loc
, ARRAY_REF
, array_expr
, index_exp
,
368 NULL_TREE
, NULL_TREE
);
369 array_expr
= build_non_dependent_expr (array_expr
);
370 index_exp
= build_non_dependent_expr (index_exp
);
373 type
= TREE_TYPE (array_expr
);
375 type
= non_reference (type
);
377 /* If they have an `operator[]', use that. */
378 if (MAYBE_CLASS_TYPE_P (type
) || MAYBE_CLASS_TYPE_P (TREE_TYPE (index_exp
)))
380 tsubst_flags_t complain
= tf_warning_or_error
;
382 complain
|= tf_decltype
;
383 expr
= build_new_op (loc
, ARRAY_REF
, LOOKUP_NORMAL
, array_expr
,
384 index_exp
, NULL_TREE
, &overload
, complain
);
390 /* Otherwise, create an ARRAY_REF for a pointer or array type.
391 It is a little-known fact that, if `a' is an array and `i' is
392 an int, you can write `i[a]', which means the same thing as
394 if (TREE_CODE (type
) == ARRAY_TYPE
|| VECTOR_TYPE_P (type
))
397 p1
= build_expr_type_conversion (WANT_POINTER
, array_expr
, false);
399 if (TREE_CODE (TREE_TYPE (index_exp
)) == ARRAY_TYPE
)
402 p2
= build_expr_type_conversion (WANT_POINTER
, index_exp
, false);
404 i1
= build_expr_type_conversion (WANT_INT
| WANT_ENUM
, array_expr
,
406 i2
= build_expr_type_conversion (WANT_INT
| WANT_ENUM
, index_exp
,
409 if ((p1
&& i2
) && (i1
&& p2
))
410 error ("ambiguous conversion for array subscript");
413 array_expr
= p1
, index_exp
= i2
;
415 array_expr
= p2
, index_exp
= i1
;
418 error ("invalid types %<%T[%T]%> for array subscript",
419 type
, TREE_TYPE (index_exp
));
420 return error_mark_node
;
423 if (array_expr
== error_mark_node
|| index_exp
== error_mark_node
)
424 error ("ambiguous conversion for array subscript");
426 expr
= build_array_ref (input_location
, array_expr
, index_exp
);
428 if (processing_template_decl
&& expr
!= error_mark_node
)
430 if (overload
!= NULL_TREE
)
431 return (build_min_non_dep_op_overload
432 (ARRAY_REF
, expr
, overload
, orig_array_expr
, orig_index_exp
));
434 return build_min_non_dep (ARRAY_REF
, expr
, orig_array_expr
, orig_index_exp
,
435 NULL_TREE
, NULL_TREE
);
440 /* Given the cast expression EXP, checking out its validity. Either return
441 an error_mark_node if there was an unavoidable error, return a cast to
442 void for trying to delete a pointer w/ the value 0, or return the
443 call to delete. If DOING_VEC is true, we handle things differently
444 for doing an array delete.
445 Implements ARM $5.3.4. This is called from the parser. */
448 delete_sanity (tree exp
, tree size
, bool doing_vec
, int use_global_delete
,
449 tsubst_flags_t complain
)
453 if (exp
== error_mark_node
)
456 if (processing_template_decl
)
458 t
= build_min (DELETE_EXPR
, void_type_node
, exp
, size
);
459 DELETE_EXPR_USE_GLOBAL (t
) = use_global_delete
;
460 DELETE_EXPR_USE_VEC (t
) = doing_vec
;
461 TREE_SIDE_EFFECTS (t
) = 1;
465 /* An array can't have been allocated by new, so complain. */
466 if (TREE_CODE (TREE_TYPE (exp
)) == ARRAY_TYPE
)
467 warning (0, "deleting array %q#E", exp
);
469 t
= build_expr_type_conversion (WANT_POINTER
, exp
, true);
471 if (t
== NULL_TREE
|| t
== error_mark_node
)
473 error ("type %q#T argument given to %<delete%>, expected pointer",
475 return error_mark_node
;
478 type
= TREE_TYPE (t
);
480 /* As of Valley Forge, you can delete a pointer to const. */
482 /* You can't delete functions. */
483 if (TREE_CODE (TREE_TYPE (type
)) == FUNCTION_TYPE
)
485 error ("cannot delete a function. Only pointer-to-objects are "
486 "valid arguments to %<delete%>");
487 return error_mark_node
;
490 /* Deleting ptr to void is undefined behavior [expr.delete/3]. */
491 if (VOID_TYPE_P (TREE_TYPE (type
)))
493 warning (OPT_Wdelete_incomplete
, "deleting %qT is undefined", type
);
497 /* Deleting a pointer with the value zero is valid and has no effect. */
498 if (integer_zerop (t
))
499 return build1 (NOP_EXPR
, void_type_node
, t
);
502 return build_vec_delete (t
, /*maxindex=*/NULL_TREE
,
503 sfk_deleting_destructor
,
504 use_global_delete
, complain
);
506 return build_delete (type
, t
, sfk_deleting_destructor
,
507 LOOKUP_NORMAL
, use_global_delete
,
511 /* Report an error if the indicated template declaration is not the
512 sort of thing that should be a member template. */
515 check_member_template (tree tmpl
)
519 gcc_assert (TREE_CODE (tmpl
) == TEMPLATE_DECL
);
520 decl
= DECL_TEMPLATE_RESULT (tmpl
);
522 if (TREE_CODE (decl
) == FUNCTION_DECL
523 || DECL_ALIAS_TEMPLATE_P (tmpl
)
524 || (TREE_CODE (decl
) == TYPE_DECL
525 && MAYBE_CLASS_TYPE_P (TREE_TYPE (decl
))))
527 /* The parser rejects template declarations in local classes
528 (with the exception of generic lambdas). */
529 gcc_assert (!current_function_decl
|| LAMBDA_FUNCTION_P (decl
));
530 /* The parser rejects any use of virtual in a function template. */
531 gcc_assert (!(TREE_CODE (decl
) == FUNCTION_DECL
532 && DECL_VIRTUAL_P (decl
)));
534 /* The debug-information generating code doesn't know what to do
535 with member templates. */
536 DECL_IGNORED_P (tmpl
) = 1;
538 else if (variable_template_p (tmpl
))
541 error ("template declaration of %q#D", decl
);
544 /* Sanity check: report error if this function FUNCTION is not
545 really a member of the class (CTYPE) it is supposed to belong to.
546 TEMPLATE_PARMS is used to specify the template parameters of a member
547 template passed as FUNCTION_DECL. If the member template is passed as a
548 TEMPLATE_DECL, it can be NULL since the parameters can be extracted
549 from the declaration. If the function is not a function template, it
551 It returns the original declaration for the function, NULL_TREE if
552 no declaration was found, error_mark_node if an error was emitted. */
555 check_classfn (tree ctype
, tree function
, tree template_parms
)
561 if (DECL_USE_TEMPLATE (function
)
562 && !(TREE_CODE (function
) == TEMPLATE_DECL
563 && DECL_TEMPLATE_SPECIALIZATION (function
))
564 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (function
)))
565 /* Since this is a specialization of a member template,
566 we're not going to find the declaration in the class.
569 struct S { template <typename T> void f(T); };
570 template <> void S::f(int);
572 we're not going to find `S::f(int)', but there's no
573 reason we should, either. We let our callers know we didn't
574 find the method, but we don't complain. */
577 /* Basic sanity check: for a template function, the template parameters
578 either were not passed, or they are the same of DECL_TEMPLATE_PARMS. */
579 if (TREE_CODE (function
) == TEMPLATE_DECL
)
582 && !comp_template_parms (template_parms
,
583 DECL_TEMPLATE_PARMS (function
)))
585 error ("template parameter lists provided don%'t match the "
586 "template parameters of %qD", function
);
587 return error_mark_node
;
589 template_parms
= DECL_TEMPLATE_PARMS (function
);
592 /* OK, is this a definition of a member template? */
593 is_template
= (template_parms
!= NULL_TREE
);
597 A destructor shall not be a member template. */
598 if (DECL_DESTRUCTOR_P (function
) && is_template
)
600 error ("destructor %qD declared as member template", function
);
601 return error_mark_node
;
604 /* We must enter the scope here, because conversion operators are
605 named by target type, and type equivalence relies on typenames
606 resolving within the scope of CTYPE. */
607 pushed_scope
= push_scope (ctype
);
608 ix
= class_method_index_for_fn (complete_type (ctype
), function
);
611 vec
<tree
, va_gc
> *methods
= CLASSTYPE_METHOD_VEC (ctype
);
612 tree fndecls
, fndecl
= 0;
614 const char *format
= NULL
;
616 for (fndecls
= (*methods
)[ix
];
617 fndecls
; fndecls
= OVL_NEXT (fndecls
))
621 fndecl
= OVL_CURRENT (fndecls
);
622 p1
= TYPE_ARG_TYPES (TREE_TYPE (function
));
623 p2
= TYPE_ARG_TYPES (TREE_TYPE (fndecl
));
625 /* We cannot simply call decls_match because this doesn't
626 work for static member functions that are pretending to
627 be methods, and because the name may have been changed by
630 /* Get rid of the this parameter on functions that become
632 if (DECL_STATIC_FUNCTION_P (fndecl
)
633 && TREE_CODE (TREE_TYPE (function
)) == METHOD_TYPE
)
634 p1
= TREE_CHAIN (p1
);
636 /* A member template definition only matches a member template
638 if (is_template
!= (TREE_CODE (fndecl
) == TEMPLATE_DECL
))
641 /* ref-qualifier or absence of same must match. */
642 if (type_memfn_rqual (TREE_TYPE (function
))
643 != type_memfn_rqual (TREE_TYPE (fndecl
)))
646 // Include constraints in the match.
647 tree c1
= get_constraints (function
);
648 tree c2
= get_constraints (fndecl
);
650 /* While finding a match, same types and params are not enough
651 if the function is versioned. Also check version ("target")
653 if (same_type_p (TREE_TYPE (TREE_TYPE (function
)),
654 TREE_TYPE (TREE_TYPE (fndecl
)))
655 && compparms (p1
, p2
)
656 && !targetm
.target_option
.function_versions (function
, fndecl
)
658 || comp_template_parms (template_parms
,
659 DECL_TEMPLATE_PARMS (fndecl
)))
660 && equivalent_constraints (c1
, c2
)
661 && (DECL_TEMPLATE_SPECIALIZATION (function
)
662 == DECL_TEMPLATE_SPECIALIZATION (fndecl
))
663 && (!DECL_TEMPLATE_SPECIALIZATION (function
)
664 || (DECL_TI_TEMPLATE (function
)
665 == DECL_TI_TEMPLATE (fndecl
))))
671 pop_scope (pushed_scope
);
672 return OVL_CURRENT (fndecls
);
675 error_at (DECL_SOURCE_LOCATION (function
),
676 "prototype for %q#D does not match any in class %qT",
678 is_conv_op
= DECL_CONV_FN_P (fndecl
);
681 ix
= CLASSTYPE_FIRST_CONVERSION_SLOT
;
682 fndecls
= (*methods
)[ix
];
685 fndecl
= OVL_CURRENT (fndecls
);
686 fndecls
= OVL_NEXT (fndecls
);
688 if (!fndecls
&& is_conv_op
)
690 if (methods
->length () > (size_t) ++ix
)
692 fndecls
= (*methods
)[ix
];
693 if (!DECL_CONV_FN_P (OVL_CURRENT (fndecls
)))
705 format
= N_("candidates are: %+#D");
707 format
= N_("candidate is: %+#D");
708 error (format
, fndecl
);
711 else if (!COMPLETE_TYPE_P (ctype
))
712 cxx_incomplete_type_error (function
, ctype
);
714 error ("no %q#D member function declared in class %qT",
718 pop_scope (pushed_scope
);
719 return error_mark_node
;
722 /* DECL is a function with vague linkage. Remember it so that at the
723 end of the translation unit we can decide whether or not to emit
727 note_vague_linkage_fn (tree decl
)
729 DECL_DEFER_OUTPUT (decl
) = 1;
730 vec_safe_push (deferred_fns
, decl
);
733 /* As above, but for variable template instantiations. */
736 note_variable_template_instantiation (tree decl
)
738 vec_safe_push (pending_statics
, decl
);
741 /* We have just processed the DECL, which is a static data member.
742 The other parameters are as for cp_finish_decl. */
745 finish_static_data_member_decl (tree decl
,
746 tree init
, bool init_const_expr_p
,
750 DECL_CONTEXT (decl
) = current_class_type
;
752 /* We cannot call pushdecl here, because that would fill in the
753 TREE_CHAIN of our decl. Instead, we modify cp_finish_decl to do
754 the right thing, namely, to put this decl out straight away. */
756 if (! processing_template_decl
)
757 vec_safe_push (pending_statics
, decl
);
759 if (LOCAL_CLASS_P (current_class_type
)
760 /* We already complained about the template definition. */
761 && !DECL_TEMPLATE_INSTANTIATION (decl
))
762 permerror (input_location
, "local class %q#T shall not have static data member %q#D",
763 current_class_type
, decl
);
765 for (tree t
= current_class_type
; TYPE_P (t
);
766 t
= CP_TYPE_CONTEXT (t
))
767 if (TYPE_UNNAMED_P (t
))
769 if (permerror (DECL_SOURCE_LOCATION (decl
),
770 "static data member %qD in unnamed class", decl
))
771 inform (DECL_SOURCE_LOCATION (TYPE_NAME (t
)),
772 "unnamed class defined here");
776 DECL_IN_AGGR_P (decl
) = 1;
778 if (TREE_CODE (TREE_TYPE (decl
)) == ARRAY_TYPE
779 && TYPE_DOMAIN (TREE_TYPE (decl
)) == NULL_TREE
)
780 SET_VAR_HAD_UNKNOWN_BOUND (decl
);
782 cp_finish_decl (decl
, init
, init_const_expr_p
, asmspec_tree
, flags
);
785 /* DECLARATOR and DECLSPECS correspond to a class member. The other
786 parameters are as for cp_finish_decl. Return the DECL for the
787 class member declared. */
790 grokfield (const cp_declarator
*declarator
,
791 cp_decl_specifier_seq
*declspecs
,
792 tree init
, bool init_const_expr_p
,
797 const char *asmspec
= 0;
802 && TREE_CODE (init
) == TREE_LIST
803 && TREE_VALUE (init
) == error_mark_node
804 && TREE_CHAIN (init
) == NULL_TREE
)
807 value
= grokdeclarator (declarator
, declspecs
, FIELD
, init
!= 0, &attrlist
);
808 if (! value
|| value
== error_mark_node
)
809 /* friend or constructor went bad. */
810 return error_mark_node
;
811 if (TREE_TYPE (value
) == error_mark_node
)
814 if (TREE_CODE (value
) == TYPE_DECL
&& init
)
816 error ("typedef %qD is initialized (use decltype instead)", value
);
820 /* Pass friendly classes back. */
821 if (value
== void_type_node
)
825 name
= DECL_NAME (value
);
827 if (name
!= NULL_TREE
)
829 if (TREE_CODE (name
) == TEMPLATE_ID_EXPR
)
831 error ("explicit template argument list not allowed");
832 return error_mark_node
;
835 if (IDENTIFIER_POINTER (name
)[0] == '_'
836 && ! strcmp (IDENTIFIER_POINTER (name
), "_vptr"))
837 error ("member %qD conflicts with virtual function table field name",
841 /* Stash away type declarations. */
842 if (TREE_CODE (value
) == TYPE_DECL
)
844 DECL_NONLOCAL (value
) = 1;
845 DECL_CONTEXT (value
) = current_class_type
;
851 /* If this is a typedef that names the class for linkage purposes
852 (7.1.3p8), apply any attributes directly to the type. */
853 if (OVERLOAD_TYPE_P (TREE_TYPE (value
))
854 && value
== TYPE_NAME (TYPE_MAIN_VARIANT (TREE_TYPE (value
))))
855 attrflags
= ATTR_FLAG_TYPE_IN_PLACE
;
857 cplus_decl_attributes (&value
, attrlist
, attrflags
);
860 if (decl_spec_seq_has_spec_p (declspecs
, ds_typedef
)
861 && TREE_TYPE (value
) != error_mark_node
862 && TYPE_NAME (TYPE_MAIN_VARIANT (TREE_TYPE (value
))) != value
)
863 set_underlying_type (value
);
865 /* It's important that push_template_decl below follows
866 set_underlying_type above so that the created template
867 carries the properly set type of VALUE. */
868 if (processing_template_decl
)
869 value
= push_template_decl (value
);
871 record_locally_defined_typedef (value
);
875 int friendp
= decl_spec_seq_has_spec_p (declspecs
, ds_friend
);
877 if (!friendp
&& DECL_IN_AGGR_P (value
))
879 error ("%qD is already defined in %qT", value
, DECL_CONTEXT (value
));
880 return void_type_node
;
883 if (asmspec_tree
&& asmspec_tree
!= error_mark_node
)
884 asmspec
= TREE_STRING_POINTER (asmspec_tree
);
888 if (TREE_CODE (value
) == FUNCTION_DECL
)
890 if (init
== ridpointers
[(int)RID_DELETE
])
892 DECL_DELETED_FN (value
) = 1;
893 DECL_DECLARED_INLINE_P (value
) = 1;
894 DECL_INITIAL (value
) = error_mark_node
;
896 else if (init
== ridpointers
[(int)RID_DEFAULT
])
898 if (defaultable_fn_check (value
))
900 DECL_DEFAULTED_FN (value
) = 1;
901 DECL_INITIALIZED_IN_CLASS_P (value
) = 1;
902 DECL_DECLARED_INLINE_P (value
) = 1;
905 else if (TREE_CODE (init
) == DEFAULT_ARG
)
906 error ("invalid initializer for member function %qD", value
);
907 else if (TREE_CODE (TREE_TYPE (value
)) == METHOD_TYPE
)
909 if (integer_zerop (init
))
910 DECL_PURE_VIRTUAL_P (value
) = 1;
911 else if (error_operand_p (init
))
912 ; /* An error has already been reported. */
914 error ("invalid initializer for member function %qD",
919 gcc_assert (TREE_CODE (TREE_TYPE (value
)) == FUNCTION_TYPE
);
921 error ("initializer specified for friend function %qD",
924 error ("initializer specified for static member function %qD",
928 else if (TREE_CODE (value
) == FIELD_DECL
)
929 /* C++11 NSDMI, keep going. */;
930 else if (!VAR_P (value
))
934 /* Pass friend decls back. */
935 if ((TREE_CODE (value
) == FUNCTION_DECL
936 || TREE_CODE (value
) == TEMPLATE_DECL
)
937 && DECL_CONTEXT (value
) != current_class_type
)
940 /* Need to set this before push_template_decl. */
942 DECL_CONTEXT (value
) = current_class_type
;
944 if (processing_template_decl
&& VAR_OR_FUNCTION_DECL_P (value
))
946 value
= push_template_decl (value
);
947 if (error_operand_p (value
))
948 return error_mark_node
;
952 cplus_decl_attributes (&value
, attrlist
, 0);
954 if (init
&& DIRECT_LIST_INIT_P (init
))
955 flags
= LOOKUP_NORMAL
;
957 flags
= LOOKUP_IMPLICIT
;
959 switch (TREE_CODE (value
))
962 finish_static_data_member_decl (value
, init
, init_const_expr_p
,
963 asmspec_tree
, flags
);
968 error ("%<asm%> specifiers are not permitted on non-static data members");
969 if (DECL_INITIAL (value
) == error_mark_node
)
970 init
= error_mark_node
;
971 cp_finish_decl (value
, init
, /*init_const_expr_p=*/false,
973 DECL_IN_AGGR_P (value
) = 1;
978 set_user_assembler_name (value
, asmspec
);
980 cp_finish_decl (value
,
982 /*init_const_expr_p=*/false,
983 asmspec_tree
, flags
);
985 /* Pass friends back this way. */
986 if (DECL_FRIEND_P (value
))
987 return void_type_node
;
989 DECL_IN_AGGR_P (value
) = 1;
998 /* Like `grokfield', but for bitfields.
999 WIDTH is non-NULL for bit fields only, and is an INTEGER_CST node. */
1002 grokbitfield (const cp_declarator
*declarator
,
1003 cp_decl_specifier_seq
*declspecs
, tree width
,
1006 tree value
= grokdeclarator (declarator
, declspecs
, BITFIELD
, 0, &attrlist
);
1008 if (value
== error_mark_node
)
1009 return NULL_TREE
; /* friends went bad. */
1010 if (TREE_TYPE (value
) == error_mark_node
)
1013 /* Pass friendly classes back. */
1014 if (VOID_TYPE_P (value
))
1015 return void_type_node
;
1017 if (!INTEGRAL_OR_ENUMERATION_TYPE_P (TREE_TYPE (value
))
1018 && (POINTER_TYPE_P (value
)
1019 || !dependent_type_p (TREE_TYPE (value
))))
1021 error ("bit-field %qD with non-integral type", value
);
1022 return error_mark_node
;
1025 if (TREE_CODE (value
) == TYPE_DECL
)
1027 error ("cannot declare %qD to be a bit-field type", value
);
1031 /* Usually, finish_struct_1 catches bitfields with invalid types.
1032 But, in the case of bitfields with function type, we confuse
1033 ourselves into thinking they are member functions, so we must
1035 if (TREE_CODE (value
) == FUNCTION_DECL
)
1037 error ("cannot declare bit-field %qD with function type",
1042 if (DECL_IN_AGGR_P (value
))
1044 error ("%qD is already defined in the class %qT", value
,
1045 DECL_CONTEXT (value
));
1046 return void_type_node
;
1049 if (TREE_STATIC (value
))
1051 error ("static member %qD cannot be a bit-field", value
);
1054 cp_finish_decl (value
, NULL_TREE
, false, NULL_TREE
, 0);
1056 if (width
!= error_mark_node
)
1058 /* The width must be an integer type. */
1059 if (!type_dependent_expression_p (width
)
1060 && !INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (TREE_TYPE (width
)))
1061 error ("width of bit-field %qD has non-integral type %qT", value
,
1063 DECL_INITIAL (value
) = width
;
1064 SET_DECL_C_BIT_FIELD (value
);
1067 DECL_IN_AGGR_P (value
) = 1;
1070 cplus_decl_attributes (&value
, attrlist
, /*flags=*/0);
1076 /* Returns true iff ATTR is an attribute which needs to be applied at
1077 instantiation time rather than template definition time. */
1080 is_late_template_attribute (tree attr
, tree decl
)
1082 tree name
= get_attribute_name (attr
);
1083 tree args
= TREE_VALUE (attr
);
1084 const struct attribute_spec
*spec
= lookup_attribute_spec (name
);
1088 /* Unknown attribute. */
1091 /* Attribute weak handling wants to write out assembly right away. */
1092 if (is_attribute_p ("weak", name
))
1095 /* Attribute unused is applied directly, as it appertains to
1097 if (is_attribute_p ("unused", name
))
1100 /* Attribute tls_model wants to modify the symtab. */
1101 if (is_attribute_p ("tls_model", name
))
1104 /* #pragma omp declare simd attribute needs to be always deferred. */
1106 && is_attribute_p ("omp declare simd", name
))
1109 /* An attribute pack is clearly dependent. */
1110 if (args
&& PACK_EXPANSION_P (args
))
1113 /* If any of the arguments are dependent expressions, we can't evaluate
1114 the attribute until instantiation time. */
1115 for (arg
= args
; arg
; arg
= TREE_CHAIN (arg
))
1117 tree t
= TREE_VALUE (arg
);
1119 /* If the first attribute argument is an identifier, only consider
1120 second and following arguments. Attributes like mode, format,
1121 cleanup and several target specific attributes aren't late
1122 just because they have an IDENTIFIER_NODE as first argument. */
1123 if (arg
== args
&& attribute_takes_identifier_p (name
)
1124 && identifier_p (t
))
1127 if (value_dependent_expression_p (t
)
1128 || type_dependent_expression_p (t
))
1132 if (TREE_CODE (decl
) == TYPE_DECL
1134 || spec
->type_required
)
1136 tree type
= TYPE_P (decl
) ? decl
: TREE_TYPE (decl
);
1138 /* We can't apply any attributes to a completely unknown type until
1139 instantiation time. */
1140 enum tree_code code
= TREE_CODE (type
);
1141 if (code
== TEMPLATE_TYPE_PARM
1142 || code
== BOUND_TEMPLATE_TEMPLATE_PARM
1143 || code
== TYPENAME_TYPE
)
1145 /* Also defer most attributes on dependent types. This is not
1146 necessary in all cases, but is the better default. */
1147 else if (dependent_type_p (type
)
1148 /* But some attributes specifically apply to templates. */
1149 && !is_attribute_p ("abi_tag", name
)
1150 && !is_attribute_p ("deprecated", name
)
1151 && !is_attribute_p ("visibility", name
))
1160 /* ATTR_P is a list of attributes. Remove any attributes which need to be
1161 applied at instantiation time and return them. If IS_DEPENDENT is true,
1162 the declaration itself is dependent, so all attributes should be applied
1163 at instantiation time. */
1166 splice_template_attributes (tree
*attr_p
, tree decl
)
1169 tree late_attrs
= NULL_TREE
;
1170 tree
*q
= &late_attrs
;
1177 if (is_late_template_attribute (*p
, decl
))
1179 ATTR_IS_DEPENDENT (*p
) = 1;
1181 *p
= TREE_CHAIN (*p
);
1182 q
= &TREE_CHAIN (*q
);
1186 p
= &TREE_CHAIN (*p
);
1192 /* Remove any late attributes from the list in ATTR_P and attach them to
1196 save_template_attributes (tree
*attr_p
, tree
*decl_p
)
1200 if (attr_p
&& *attr_p
== error_mark_node
)
1203 tree late_attrs
= splice_template_attributes (attr_p
, *decl_p
);
1207 if (DECL_P (*decl_p
))
1208 q
= &DECL_ATTRIBUTES (*decl_p
);
1210 q
= &TYPE_ATTRIBUTES (*decl_p
);
1212 tree old_attrs
= *q
;
1214 /* Merge the late attributes at the beginning with the attribute
1216 late_attrs
= merge_attributes (late_attrs
, *q
);
1219 if (!DECL_P (*decl_p
) && *decl_p
== TYPE_MAIN_VARIANT (*decl_p
))
1221 /* We've added new attributes directly to the main variant, so
1222 now we need to update all of the other variants to include
1223 these new attributes. */
1225 for (variant
= TYPE_NEXT_VARIANT (*decl_p
); variant
;
1226 variant
= TYPE_NEXT_VARIANT (variant
))
1228 gcc_assert (TYPE_ATTRIBUTES (variant
) == old_attrs
);
1229 TYPE_ATTRIBUTES (variant
) = TYPE_ATTRIBUTES (*decl_p
);
1234 /* True if ATTRS contains any dependent attributes that affect type
1238 any_dependent_type_attributes_p (tree attrs
)
1240 for (tree a
= attrs
; a
; a
= TREE_CHAIN (a
))
1241 if (ATTR_IS_DEPENDENT (a
))
1243 const attribute_spec
*as
= lookup_attribute_spec (TREE_PURPOSE (a
));
1244 if (as
&& as
->affects_type_identity
)
1250 /* Return true iff ATTRS are acceptable attributes to be applied in-place
1251 to a typedef which gives a previously unnamed class or enum a name for
1252 linkage purposes. */
1255 attributes_naming_typedef_ok (tree attrs
)
1257 for (; attrs
; attrs
= TREE_CHAIN (attrs
))
1259 tree name
= get_attribute_name (attrs
);
1260 if (is_attribute_p ("vector_size", name
))
1266 /* Like reconstruct_complex_type, but handle also template trees. */
1269 cp_reconstruct_complex_type (tree type
, tree bottom
)
1272 bool late_return_type_p
= false;
1274 if (TYPE_PTR_P (type
))
1276 inner
= cp_reconstruct_complex_type (TREE_TYPE (type
), bottom
);
1277 outer
= build_pointer_type_for_mode (inner
, TYPE_MODE (type
),
1278 TYPE_REF_CAN_ALIAS_ALL (type
));
1280 else if (TREE_CODE (type
) == REFERENCE_TYPE
)
1282 inner
= cp_reconstruct_complex_type (TREE_TYPE (type
), bottom
);
1283 outer
= build_reference_type_for_mode (inner
, TYPE_MODE (type
),
1284 TYPE_REF_CAN_ALIAS_ALL (type
));
1286 else if (TREE_CODE (type
) == ARRAY_TYPE
)
1288 inner
= cp_reconstruct_complex_type (TREE_TYPE (type
), bottom
);
1289 outer
= build_cplus_array_type (inner
, TYPE_DOMAIN (type
));
1290 /* Don't call cp_build_qualified_type on ARRAY_TYPEs, the
1291 element type qualification will be handled by the recursive
1292 cp_reconstruct_complex_type call and cp_build_qualified_type
1293 for ARRAY_TYPEs changes the element type. */
1296 else if (TREE_CODE (type
) == FUNCTION_TYPE
)
1298 late_return_type_p
= TYPE_HAS_LATE_RETURN_TYPE (type
);
1299 inner
= cp_reconstruct_complex_type (TREE_TYPE (type
), bottom
);
1300 outer
= build_function_type (inner
, TYPE_ARG_TYPES (type
));
1301 outer
= apply_memfn_quals (outer
,
1302 type_memfn_quals (type
),
1303 type_memfn_rqual (type
));
1305 else if (TREE_CODE (type
) == METHOD_TYPE
)
1307 late_return_type_p
= TYPE_HAS_LATE_RETURN_TYPE (type
);
1308 inner
= cp_reconstruct_complex_type (TREE_TYPE (type
), bottom
);
1309 /* The build_method_type_directly() routine prepends 'this' to argument list,
1310 so we must compensate by getting rid of it. */
1312 = build_method_type_directly
1313 (class_of_this_parm (type
), inner
,
1314 TREE_CHAIN (TYPE_ARG_TYPES (type
)));
1316 else if (TREE_CODE (type
) == OFFSET_TYPE
)
1318 inner
= cp_reconstruct_complex_type (TREE_TYPE (type
), bottom
);
1319 outer
= build_offset_type (TYPE_OFFSET_BASETYPE (type
), inner
);
1324 if (TYPE_ATTRIBUTES (type
))
1325 outer
= cp_build_type_attribute_variant (outer
, TYPE_ATTRIBUTES (type
));
1326 outer
= cp_build_qualified_type (outer
, cp_type_quals (type
));
1328 if (late_return_type_p
)
1329 TYPE_HAS_LATE_RETURN_TYPE (outer
) = 1;
1334 /* Replaces any constexpr expression that may be into the attributes
1335 arguments with their reduced value. */
1338 cp_check_const_attributes (tree attributes
)
1340 if (attributes
== error_mark_node
)
1344 for (attr
= attributes
; attr
; attr
= TREE_CHAIN (attr
))
1347 for (arg
= TREE_VALUE (attr
); arg
; arg
= TREE_CHAIN (arg
))
1349 tree expr
= TREE_VALUE (arg
);
1351 TREE_VALUE (arg
) = maybe_constant_value (expr
);
1356 /* Return true if TYPE is an OpenMP mappable type. */
1358 cp_omp_mappable_type (tree type
)
1360 /* Mappable type has to be complete. */
1361 if (type
== error_mark_node
|| !COMPLETE_TYPE_P (type
))
1363 /* Arrays have mappable type if the elements have mappable type. */
1364 while (TREE_CODE (type
) == ARRAY_TYPE
)
1365 type
= TREE_TYPE (type
);
1366 /* A mappable type cannot contain virtual members. */
1367 if (CLASS_TYPE_P (type
) && CLASSTYPE_VTABLES (type
))
1369 /* All data members must be non-static. */
1370 if (CLASS_TYPE_P (type
))
1373 for (field
= TYPE_FIELDS (type
); field
; field
= DECL_CHAIN (field
))
1376 /* All fields must have mappable types. */
1377 else if (TREE_CODE (field
) == FIELD_DECL
1378 && !cp_omp_mappable_type (TREE_TYPE (field
)))
1384 /* Like decl_attributes, but handle C++ complexity. */
1387 cplus_decl_attributes (tree
*decl
, tree attributes
, int flags
)
1389 if (*decl
== NULL_TREE
|| *decl
== void_type_node
1390 || *decl
== error_mark_node
)
1393 /* Add implicit "omp declare target" attribute if requested. */
1394 if (scope_chain
->omp_declare_target_attribute
1396 && (TREE_STATIC (*decl
) || DECL_EXTERNAL (*decl
)))
1397 || TREE_CODE (*decl
) == FUNCTION_DECL
))
1400 && DECL_CLASS_SCOPE_P (*decl
))
1401 error ("%q+D static data member inside of declare target directive",
1403 else if (!processing_template_decl
1405 && !cp_omp_mappable_type (TREE_TYPE (*decl
)))
1406 error ("%q+D in declare target directive does not have mappable type",
1409 attributes
= tree_cons (get_identifier ("omp declare target"),
1410 NULL_TREE
, attributes
);
1413 if (processing_template_decl
)
1415 if (check_for_bare_parameter_packs (attributes
))
1418 save_template_attributes (&attributes
, decl
);
1421 cp_check_const_attributes (attributes
);
1423 if (TREE_CODE (*decl
) == TEMPLATE_DECL
)
1424 decl
= &DECL_TEMPLATE_RESULT (*decl
);
1426 if (TREE_TYPE (*decl
) && TYPE_PTRMEMFUNC_P (TREE_TYPE (*decl
)))
1429 = decl_attributes (decl
, attributes
, flags
| ATTR_FLAG_FUNCTION_NEXT
);
1430 decl_attributes (&TYPE_PTRMEMFUNC_FN_TYPE_RAW (TREE_TYPE (*decl
)),
1434 decl_attributes (decl
, attributes
, flags
);
1436 if (TREE_CODE (*decl
) == TYPE_DECL
)
1437 SET_IDENTIFIER_TYPE_VALUE (DECL_NAME (*decl
), TREE_TYPE (*decl
));
1439 /* Propagate deprecation out to the template. */
1440 if (TREE_DEPRECATED (*decl
))
1441 if (tree ti
= get_template_info (*decl
))
1443 tree tmpl
= TI_TEMPLATE (ti
);
1444 tree pattern
= (TYPE_P (*decl
) ? TREE_TYPE (tmpl
)
1445 : DECL_TEMPLATE_RESULT (tmpl
));
1446 if (*decl
== pattern
)
1447 TREE_DEPRECATED (tmpl
) = true;
1451 /* Walks through the namespace- or function-scope anonymous union
1452 OBJECT, with the indicated TYPE, building appropriate VAR_DECLs.
1453 Returns one of the fields for use in the mangled name. */
1456 build_anon_union_vars (tree type
, tree object
)
1458 tree main_decl
= NULL_TREE
;
1461 /* Rather than write the code to handle the non-union case,
1462 just give an error. */
1463 if (TREE_CODE (type
) != UNION_TYPE
)
1465 error ("anonymous struct not inside named type");
1466 return error_mark_node
;
1469 for (field
= TYPE_FIELDS (type
);
1471 field
= DECL_CHAIN (field
))
1476 if (DECL_ARTIFICIAL (field
))
1478 if (TREE_CODE (field
) != FIELD_DECL
)
1480 permerror (DECL_SOURCE_LOCATION (field
),
1481 "%q#D invalid; an anonymous union can only "
1482 "have non-static data members", field
);
1486 if (TREE_PRIVATE (field
))
1487 permerror (DECL_SOURCE_LOCATION (field
),
1488 "private member %q#D in anonymous union", field
);
1489 else if (TREE_PROTECTED (field
))
1490 permerror (DECL_SOURCE_LOCATION (field
),
1491 "protected member %q#D in anonymous union", field
);
1493 if (processing_template_decl
)
1494 ref
= build_min_nt_loc (UNKNOWN_LOCATION
, COMPONENT_REF
, object
,
1495 DECL_NAME (field
), NULL_TREE
);
1497 ref
= build_class_member_access_expr (object
, field
, NULL_TREE
,
1498 false, tf_warning_or_error
);
1500 if (DECL_NAME (field
))
1504 decl
= build_decl (input_location
,
1505 VAR_DECL
, DECL_NAME (field
), TREE_TYPE (field
));
1506 DECL_ANON_UNION_VAR_P (decl
) = 1;
1507 DECL_ARTIFICIAL (decl
) = 1;
1509 base
= get_base_address (object
);
1510 TREE_PUBLIC (decl
) = TREE_PUBLIC (base
);
1511 TREE_STATIC (decl
) = TREE_STATIC (base
);
1512 DECL_EXTERNAL (decl
) = DECL_EXTERNAL (base
);
1514 SET_DECL_VALUE_EXPR (decl
, ref
);
1515 DECL_HAS_VALUE_EXPR_P (decl
) = 1;
1517 decl
= pushdecl (decl
);
1519 else if (ANON_AGGR_TYPE_P (TREE_TYPE (field
)))
1520 decl
= build_anon_union_vars (TREE_TYPE (field
), ref
);
1524 if (main_decl
== NULL_TREE
)
1531 /* Finish off the processing of a UNION_TYPE structure. If the union is an
1532 anonymous union, then all members must be laid out together. PUBLIC_P
1533 is nonzero if this union is not declared static. */
1536 finish_anon_union (tree anon_union_decl
)
1542 if (anon_union_decl
== error_mark_node
)
1545 type
= TREE_TYPE (anon_union_decl
);
1546 public_p
= TREE_PUBLIC (anon_union_decl
);
1548 /* The VAR_DECL's context is the same as the TYPE's context. */
1549 DECL_CONTEXT (anon_union_decl
) = DECL_CONTEXT (TYPE_NAME (type
));
1551 if (TYPE_FIELDS (type
) == NULL_TREE
)
1556 error ("namespace-scope anonymous aggregates must be static");
1560 main_decl
= build_anon_union_vars (type
, anon_union_decl
);
1561 if (main_decl
== error_mark_node
)
1563 if (main_decl
== NULL_TREE
)
1565 warning (0, "anonymous union with no members");
1569 if (!processing_template_decl
)
1571 /* Use main_decl to set the mangled name. */
1572 DECL_NAME (anon_union_decl
) = DECL_NAME (main_decl
);
1573 maybe_commonize_var (anon_union_decl
);
1574 if (TREE_STATIC (anon_union_decl
) || DECL_EXTERNAL (anon_union_decl
))
1575 mangle_decl (anon_union_decl
);
1576 DECL_NAME (anon_union_decl
) = NULL_TREE
;
1579 pushdecl (anon_union_decl
);
1580 cp_finish_decl (anon_union_decl
, NULL_TREE
, false, NULL_TREE
, 0);
1583 /* Auxiliary functions to make type signatures for
1584 `operator new' and `operator delete' correspond to
1585 what compiler will be expecting. */
1588 coerce_new_type (tree type
)
1591 tree args
= TYPE_ARG_TYPES (type
);
1593 gcc_assert (TREE_CODE (type
) == FUNCTION_TYPE
);
1595 if (!same_type_p (TREE_TYPE (type
), ptr_type_node
))
1598 error ("%<operator new%> must return type %qT", ptr_type_node
);
1601 if (args
&& args
!= void_list_node
)
1603 if (TREE_PURPOSE (args
))
1605 /* [basic.stc.dynamic.allocation]
1607 The first parameter shall not have an associated default
1609 error ("the first parameter of %<operator new%> cannot "
1610 "have a default argument");
1611 /* Throw away the default argument. */
1612 TREE_PURPOSE (args
) = NULL_TREE
;
1615 if (!same_type_p (TREE_VALUE (args
), size_type_node
))
1618 args
= TREE_CHAIN (args
);
1625 permerror (input_location
, "%<operator new%> takes type %<size_t%> (%qT) "
1626 "as first parameter", size_type_node
);
1631 args
= tree_cons (NULL_TREE
, size_type_node
, args
);
1634 type
= build_exception_variant
1635 (build_function_type (ptr_type_node
, args
),
1636 TYPE_RAISES_EXCEPTIONS (type
));
1644 coerce_delete_type (tree type
)
1647 tree args
= TYPE_ARG_TYPES (type
);
1649 gcc_assert (TREE_CODE (type
) == FUNCTION_TYPE
);
1651 if (!same_type_p (TREE_TYPE (type
), void_type_node
))
1654 error ("%<operator delete%> must return type %qT", void_type_node
);
1657 if (!args
|| args
== void_list_node
1658 || !same_type_p (TREE_VALUE (args
), ptr_type_node
))
1661 if (args
&& args
!= void_list_node
)
1662 args
= TREE_CHAIN (args
);
1663 error ("%<operator delete%> takes type %qT as first parameter",
1669 args
= tree_cons (NULL_TREE
, ptr_type_node
, args
);
1672 type
= build_exception_variant
1673 (build_function_type (void_type_node
, args
),
1674 TYPE_RAISES_EXCEPTIONS (type
));
1682 /* DECL is a VAR_DECL for a vtable: walk through the entries in the vtable
1683 and mark them as needed. */
1686 mark_vtable_entries (tree decl
)
1689 unsigned HOST_WIDE_INT idx
;
1691 /* It's OK for the vtable to refer to deprecated virtual functions. */
1692 warning_sentinel
w(warn_deprecated_decl
);
1694 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (DECL_INITIAL (decl
)),
1699 STRIP_NOPS (fnaddr
);
1701 if (TREE_CODE (fnaddr
) != ADDR_EXPR
1702 && TREE_CODE (fnaddr
) != FDESC_EXPR
)
1703 /* This entry is an offset: a virtual base class offset, a
1704 virtual call offset, an RTTI offset, etc. */
1707 fn
= TREE_OPERAND (fnaddr
, 0);
1708 TREE_ADDRESSABLE (fn
) = 1;
1709 /* When we don't have vcall offsets, we output thunks whenever
1710 we output the vtables that contain them. With vcall offsets,
1711 we know all the thunks we'll need when we emit a virtual
1712 function, so we emit the thunks there instead. */
1713 if (DECL_THUNK_P (fn
))
1714 use_thunk (fn
, /*emit_p=*/0);
1719 /* Set DECL up to have the closest approximation of "initialized common"
1720 linkage available. */
1723 comdat_linkage (tree decl
)
1726 make_decl_one_only (decl
, cxx_comdat_group (decl
));
1727 else if (TREE_CODE (decl
) == FUNCTION_DECL
1728 || (VAR_P (decl
) && DECL_ARTIFICIAL (decl
)))
1729 /* We can just emit function and compiler-generated variables
1730 statically; having multiple copies is (for the most part) only
1733 There are two correctness issues, however: the address of a
1734 template instantiation with external linkage should be the
1735 same, independent of what translation unit asks for the
1736 address, and this will not hold when we emit multiple copies of
1737 the function. However, there's little else we can do.
1739 Also, by default, the typeinfo implementation assumes that
1740 there will be only one copy of the string used as the name for
1741 each type. Therefore, if weak symbols are unavailable, the
1742 run-time library should perform a more conservative check; it
1743 should perform a string comparison, rather than an address
1745 TREE_PUBLIC (decl
) = 0;
1748 /* Static data member template instantiations, however, cannot
1749 have multiple copies. */
1750 if (DECL_INITIAL (decl
) == 0
1751 || DECL_INITIAL (decl
) == error_mark_node
)
1752 DECL_COMMON (decl
) = 1;
1753 else if (EMPTY_CONSTRUCTOR_P (DECL_INITIAL (decl
)))
1755 DECL_COMMON (decl
) = 1;
1756 DECL_INITIAL (decl
) = error_mark_node
;
1758 else if (!DECL_EXPLICIT_INSTANTIATION (decl
))
1760 /* We can't do anything useful; leave vars for explicit
1762 DECL_EXTERNAL (decl
) = 1;
1763 DECL_NOT_REALLY_EXTERN (decl
) = 0;
1767 if (TREE_PUBLIC (decl
))
1768 DECL_COMDAT (decl
) = 1;
1771 /* For win32 we also want to put explicit instantiations in
1772 linkonce sections, so that they will be merged with implicit
1773 instantiations; otherwise we get duplicate symbol errors.
1774 For Darwin we do not want explicit instantiations to be
1778 maybe_make_one_only (tree decl
)
1780 /* We used to say that this was not necessary on targets that support weak
1781 symbols, because the implicit instantiations will defer to the explicit
1782 one. However, that's not actually the case in SVR4; a strong definition
1783 after a weak one is an error. Also, not making explicit
1784 instantiations one_only means that we can end up with two copies of
1785 some template instantiations. */
1789 /* We can't set DECL_COMDAT on functions, or cp_finish_file will think
1790 we can get away with not emitting them if they aren't used. We need
1791 to for variables so that cp_finish_decl will update their linkage,
1792 because their DECL_INITIAL may not have been set properly yet. */
1794 if (!TARGET_WEAK_NOT_IN_ARCHIVE_TOC
1795 || (! DECL_EXPLICIT_INSTANTIATION (decl
)
1796 && ! DECL_TEMPLATE_SPECIALIZATION (decl
)))
1798 make_decl_one_only (decl
, cxx_comdat_group (decl
));
1802 varpool_node
*node
= varpool_node::get_create (decl
);
1803 DECL_COMDAT (decl
) = 1;
1804 /* Mark it needed so we don't forget to emit it. */
1805 node
->forced_by_abi
= true;
1806 TREE_USED (decl
) = 1;
1811 /* Returns true iff DECL, a FUNCTION_DECL or VAR_DECL, has vague linkage.
1812 This predicate will give the right answer during parsing of the
1813 function, which other tests may not. */
1816 vague_linkage_p (tree decl
)
1818 if (!TREE_PUBLIC (decl
))
1820 gcc_checking_assert (!DECL_COMDAT (decl
));
1823 /* Unfortunately, import_export_decl has not always been called
1824 before the function is processed, so we cannot simply check
1826 if (DECL_COMDAT (decl
)
1827 || (TREE_CODE (decl
) == FUNCTION_DECL
1828 && DECL_DECLARED_INLINE_P (decl
))
1829 || (DECL_LANG_SPECIFIC (decl
)
1830 && DECL_TEMPLATE_INSTANTIATION (decl
)))
1832 else if (DECL_FUNCTION_SCOPE_P (decl
))
1833 /* A local static in an inline effectively has vague linkage. */
1834 return (TREE_STATIC (decl
)
1835 && vague_linkage_p (DECL_CONTEXT (decl
)));
1840 /* Determine whether or not we want to specifically import or export CTYPE,
1841 using various heuristics. */
1844 import_export_class (tree ctype
)
1846 /* -1 for imported, 1 for exported. */
1847 int import_export
= 0;
1849 /* It only makes sense to call this function at EOF. The reason is
1850 that this function looks at whether or not the first non-inline
1851 non-abstract virtual member function has been defined in this
1852 translation unit. But, we can't possibly know that until we've
1853 seen the entire translation unit. */
1854 gcc_assert (at_eof
);
1856 if (CLASSTYPE_INTERFACE_KNOWN (ctype
))
1859 /* If MULTIPLE_SYMBOL_SPACES is set and we saw a #pragma interface,
1860 we will have CLASSTYPE_INTERFACE_ONLY set but not
1861 CLASSTYPE_INTERFACE_KNOWN. In that case, we don't want to use this
1862 heuristic because someone will supply a #pragma implementation
1863 elsewhere, and deducing it here would produce a conflict. */
1864 if (CLASSTYPE_INTERFACE_ONLY (ctype
))
1867 if (lookup_attribute ("dllimport", TYPE_ATTRIBUTES (ctype
)))
1869 else if (lookup_attribute ("dllexport", TYPE_ATTRIBUTES (ctype
)))
1871 else if (CLASSTYPE_IMPLICIT_INSTANTIATION (ctype
)
1872 && !flag_implicit_templates
)
1873 /* For a template class, without -fimplicit-templates, check the
1874 repository. If the virtual table is assigned to this
1875 translation unit, then export the class; otherwise, import
1877 import_export
= repo_export_class_p (ctype
) ? 1 : -1;
1878 else if (TYPE_POLYMORPHIC_P (ctype
))
1880 /* The ABI specifies that the virtual table and associated
1881 information are emitted with the key method, if any. */
1882 tree method
= CLASSTYPE_KEY_METHOD (ctype
);
1883 /* If weak symbol support is not available, then we must be
1884 careful not to emit the vtable when the key function is
1885 inline. An inline function can be defined in multiple
1886 translation units. If we were to emit the vtable in each
1887 translation unit containing a definition, we would get
1888 multiple definition errors at link-time. */
1889 if (method
&& (flag_weak
|| ! DECL_DECLARED_INLINE_P (method
)))
1890 import_export
= (DECL_REALLY_EXTERN (method
) ? -1 : 1);
1893 /* When MULTIPLE_SYMBOL_SPACES is set, we cannot count on seeing
1894 a definition anywhere else. */
1895 if (MULTIPLE_SYMBOL_SPACES
&& import_export
== -1)
1898 /* Allow back ends the chance to overrule the decision. */
1899 if (targetm
.cxx
.import_export_class
)
1900 import_export
= targetm
.cxx
.import_export_class (ctype
, import_export
);
1904 SET_CLASSTYPE_INTERFACE_KNOWN (ctype
);
1905 CLASSTYPE_INTERFACE_ONLY (ctype
) = (import_export
< 0);
1909 /* Return true if VAR has already been provided to the back end; in that
1910 case VAR should not be modified further by the front end. */
1912 var_finalized_p (tree var
)
1914 return varpool_node::get_create (var
)->definition
;
1917 /* DECL is a VAR_DECL or FUNCTION_DECL which, for whatever reason,
1918 must be emitted in this translation unit. Mark it as such. */
1921 mark_needed (tree decl
)
1923 TREE_USED (decl
) = 1;
1924 if (TREE_CODE (decl
) == FUNCTION_DECL
)
1926 /* Extern inline functions don't become needed when referenced.
1927 If we know a method will be emitted in other TU and no new
1928 functions can be marked reachable, just use the external
1930 struct cgraph_node
*node
= cgraph_node::get_create (decl
);
1931 node
->forced_by_abi
= true;
1933 /* #pragma interface and -frepo code can call mark_needed for
1934 maybe-in-charge 'tors; mark the clones as well. */
1936 FOR_EACH_CLONE (clone
, decl
)
1937 mark_needed (clone
);
1939 else if (VAR_P (decl
))
1941 varpool_node
*node
= varpool_node::get_create (decl
);
1942 /* C++ frontend use mark_decl_references to force COMDAT variables
1943 to be output that might appear dead otherwise. */
1944 node
->forced_by_abi
= true;
1948 /* DECL is either a FUNCTION_DECL or a VAR_DECL. This function
1949 returns true if a definition of this entity should be provided in
1950 this object file. Callers use this function to determine whether
1951 or not to let the back end know that a definition of DECL is
1952 available in this translation unit. */
1955 decl_needed_p (tree decl
)
1957 gcc_assert (VAR_OR_FUNCTION_DECL_P (decl
));
1958 /* This function should only be called at the end of the translation
1959 unit. We cannot be sure of whether or not something will be
1960 COMDAT until that point. */
1961 gcc_assert (at_eof
);
1963 /* All entities with external linkage that are not COMDAT/EXTERN should be
1964 emitted; they may be referred to from other object files. */
1965 if (TREE_PUBLIC (decl
) && !DECL_COMDAT (decl
) && !DECL_REALLY_EXTERN (decl
))
1967 /* Functions marked "dllexport" must be emitted so that they are
1968 visible to other DLLs. */
1969 if (flag_keep_inline_dllexport
1970 && lookup_attribute ("dllexport", DECL_ATTRIBUTES (decl
)))
1973 /* When not optimizing, do not bother to produce definitions for extern
1975 if (DECL_REALLY_EXTERN (decl
)
1976 && ((TREE_CODE (decl
) != FUNCTION_DECL
1978 || (TREE_CODE (decl
) == FUNCTION_DECL
1979 && !opt_for_fn (decl
, optimize
)))
1980 && !lookup_attribute ("always_inline", decl
))
1983 /* If this entity was used, let the back end see it; it will decide
1984 whether or not to emit it into the object file. */
1985 if (TREE_USED (decl
))
1987 /* Virtual functions might be needed for devirtualization. */
1988 if (flag_devirtualize
1989 && TREE_CODE (decl
) == FUNCTION_DECL
1990 && DECL_VIRTUAL_P (decl
))
1992 /* Otherwise, DECL does not need to be emitted -- yet. A subsequent
1993 reference to DECL might cause it to be emitted later. */
1997 /* If necessary, write out the vtables for the dynamic class CTYPE.
1998 Returns true if any vtables were emitted. */
2001 maybe_emit_vtables (tree ctype
)
2006 varpool_node
*current
= NULL
, *last
= NULL
;
2008 /* If the vtables for this class have already been emitted there is
2009 nothing more to do. */
2010 primary_vtbl
= CLASSTYPE_VTABLES (ctype
);
2011 if (var_finalized_p (primary_vtbl
))
2013 /* Ignore dummy vtables made by get_vtable_decl. */
2014 if (TREE_TYPE (primary_vtbl
) == void_type_node
)
2017 /* On some targets, we cannot determine the key method until the end
2018 of the translation unit -- which is when this function is
2020 if (!targetm
.cxx
.key_method_may_be_inline ())
2021 determine_key_method (ctype
);
2023 /* See if any of the vtables are needed. */
2024 for (vtbl
= CLASSTYPE_VTABLES (ctype
); vtbl
; vtbl
= DECL_CHAIN (vtbl
))
2026 import_export_decl (vtbl
);
2027 if (DECL_NOT_REALLY_EXTERN (vtbl
) && decl_needed_p (vtbl
))
2032 /* If the references to this class' vtables are optimized away,
2033 still emit the appropriate debugging information. See
2035 if (DECL_COMDAT (primary_vtbl
)
2036 && CLASSTYPE_DEBUG_REQUESTED (ctype
))
2037 note_debug_info_needed (ctype
);
2041 /* The ABI requires that we emit all of the vtables if we emit any
2043 for (vtbl
= CLASSTYPE_VTABLES (ctype
); vtbl
; vtbl
= DECL_CHAIN (vtbl
))
2045 /* Mark entities references from the virtual table as used. */
2046 mark_vtable_entries (vtbl
);
2048 if (TREE_TYPE (DECL_INITIAL (vtbl
)) == 0)
2050 vec
<tree
, va_gc
> *cleanups
= NULL
;
2051 tree expr
= store_init_value (vtbl
, DECL_INITIAL (vtbl
), &cleanups
,
2054 /* It had better be all done at compile-time. */
2055 gcc_assert (!expr
&& !cleanups
);
2059 DECL_EXTERNAL (vtbl
) = 0;
2060 rest_of_decl_compilation (vtbl
, 1, 1);
2062 /* Because we're only doing syntax-checking, we'll never end up
2063 actually marking the variable as written. */
2064 if (flag_syntax_only
)
2065 TREE_ASM_WRITTEN (vtbl
) = 1;
2066 else if (DECL_ONE_ONLY (vtbl
))
2068 current
= varpool_node::get_create (vtbl
);
2070 current
->add_to_same_comdat_group (last
);
2075 /* Since we're writing out the vtable here, also write the debug
2077 note_debug_info_needed (ctype
);
2082 /* A special return value from type_visibility meaning internal
2085 enum { VISIBILITY_ANON
= VISIBILITY_INTERNAL
+1 };
2087 /* walk_tree helper function for type_visibility. */
2090 min_vis_r (tree
*tp
, int *walk_subtrees
, void *data
)
2092 int *vis_p
= (int *)data
;
2097 else if (OVERLOAD_TYPE_P (*tp
)
2098 && !TREE_PUBLIC (TYPE_MAIN_DECL (*tp
)))
2100 *vis_p
= VISIBILITY_ANON
;
2103 else if (CLASS_TYPE_P (*tp
)
2104 && CLASSTYPE_VISIBILITY (*tp
) > *vis_p
)
2105 *vis_p
= CLASSTYPE_VISIBILITY (*tp
);
2109 /* Returns the visibility of TYPE, which is the minimum visibility of its
2113 type_visibility (tree type
)
2115 int vis
= VISIBILITY_DEFAULT
;
2116 cp_walk_tree_without_duplicates (&type
, min_vis_r
, &vis
);
2120 /* Limit the visibility of DECL to VISIBILITY, if not explicitly
2121 specified (or if VISIBILITY is static). If TMPL is true, this
2122 constraint is for a template argument, and takes precedence
2123 over explicitly-specified visibility on the template. */
2126 constrain_visibility (tree decl
, int visibility
, bool tmpl
)
2128 if (visibility
== VISIBILITY_ANON
)
2130 /* extern "C" declarations aren't affected by the anonymous
2132 if (!DECL_EXTERN_C_P (decl
))
2134 TREE_PUBLIC (decl
) = 0;
2135 DECL_WEAK (decl
) = 0;
2136 DECL_COMMON (decl
) = 0;
2137 DECL_COMDAT (decl
) = false;
2138 if (VAR_OR_FUNCTION_DECL_P (decl
))
2140 struct symtab_node
*snode
= symtab_node::get (decl
);
2143 snode
->set_comdat_group (NULL
);
2145 DECL_INTERFACE_KNOWN (decl
) = 1;
2146 if (DECL_LANG_SPECIFIC (decl
))
2147 DECL_NOT_REALLY_EXTERN (decl
) = 1;
2150 else if (visibility
> DECL_VISIBILITY (decl
)
2151 && (tmpl
|| !DECL_VISIBILITY_SPECIFIED (decl
)))
2153 DECL_VISIBILITY (decl
) = (enum symbol_visibility
) visibility
;
2154 /* This visibility was not specified. */
2155 DECL_VISIBILITY_SPECIFIED (decl
) = false;
2159 /* Constrain the visibility of DECL based on the visibility of its template
2163 constrain_visibility_for_template (tree decl
, tree targs
)
2165 /* If this is a template instantiation, check the innermost
2166 template args for visibility constraints. The outer template
2167 args are covered by the class check. */
2168 tree args
= INNERMOST_TEMPLATE_ARGS (targs
);
2170 for (i
= TREE_VEC_LENGTH (args
); i
> 0; --i
)
2174 tree arg
= TREE_VEC_ELT (args
, i
-1);
2176 vis
= type_visibility (arg
);
2179 if (REFERENCE_REF_P (arg
))
2180 arg
= TREE_OPERAND (arg
, 0);
2181 if (TREE_TYPE (arg
))
2183 if (TREE_CODE (arg
) == ADDR_EXPR
)
2184 arg
= TREE_OPERAND (arg
, 0);
2185 if (VAR_OR_FUNCTION_DECL_P (arg
))
2187 if (! TREE_PUBLIC (arg
))
2188 vis
= VISIBILITY_ANON
;
2190 vis
= DECL_VISIBILITY (arg
);
2194 constrain_visibility (decl
, vis
, true);
2198 /* Like c_determine_visibility, but with additional C++-specific
2201 Function-scope entities can rely on the function's visibility because
2202 it is set in start_preparsed_function.
2204 Class-scope entities cannot rely on the class's visibility until the end
2205 of the enclosing class definition.
2207 Note that because namespaces have multiple independent definitions,
2208 namespace visibility is handled elsewhere using the #pragma visibility
2209 machinery rather than by decorating the namespace declaration.
2211 The goal is for constraints from the type to give a diagnostic, and
2212 other constraints to be applied silently. */
2215 determine_visibility (tree decl
)
2217 tree class_type
= NULL_TREE
;
2219 bool orig_visibility_specified
;
2220 enum symbol_visibility orig_visibility
;
2222 /* Remember that all decls get VISIBILITY_DEFAULT when built. */
2224 /* Only relevant for names with external linkage. */
2225 if (!TREE_PUBLIC (decl
))
2228 /* Cloned constructors and destructors get the same visibility as
2229 the underlying function. That should be set up in
2230 maybe_clone_body. */
2231 gcc_assert (!DECL_CLONED_FUNCTION_P (decl
));
2233 orig_visibility_specified
= DECL_VISIBILITY_SPECIFIED (decl
);
2234 orig_visibility
= DECL_VISIBILITY (decl
);
2236 if (TREE_CODE (decl
) == TYPE_DECL
)
2238 if (CLASS_TYPE_P (TREE_TYPE (decl
)))
2239 use_template
= CLASSTYPE_USE_TEMPLATE (TREE_TYPE (decl
));
2240 else if (TYPE_TEMPLATE_INFO (TREE_TYPE (decl
)))
2245 else if (DECL_LANG_SPECIFIC (decl
))
2246 use_template
= DECL_USE_TEMPLATE (decl
);
2250 /* If DECL is a member of a class, visibility specifiers on the
2251 class can influence the visibility of the DECL. */
2252 if (DECL_CLASS_SCOPE_P (decl
))
2253 class_type
= DECL_CONTEXT (decl
);
2256 /* Not a class member. */
2258 /* Virtual tables have DECL_CONTEXT set to their associated class,
2259 so they are automatically handled above. */
2260 gcc_assert (!VAR_P (decl
)
2261 || !DECL_VTABLE_OR_VTT_P (decl
));
2263 if (DECL_FUNCTION_SCOPE_P (decl
) && ! DECL_VISIBILITY_SPECIFIED (decl
))
2265 /* Local statics and classes get the visibility of their
2266 containing function by default, except that
2267 -fvisibility-inlines-hidden doesn't affect them. */
2268 tree fn
= DECL_CONTEXT (decl
);
2269 if (DECL_VISIBILITY_SPECIFIED (fn
))
2271 DECL_VISIBILITY (decl
) = DECL_VISIBILITY (fn
);
2272 DECL_VISIBILITY_SPECIFIED (decl
) =
2273 DECL_VISIBILITY_SPECIFIED (fn
);
2277 if (DECL_CLASS_SCOPE_P (fn
))
2278 determine_visibility_from_class (decl
, DECL_CONTEXT (fn
));
2279 else if (determine_hidden_inline (fn
))
2281 DECL_VISIBILITY (decl
) = default_visibility
;
2282 DECL_VISIBILITY_SPECIFIED (decl
) =
2283 visibility_options
.inpragma
;
2287 DECL_VISIBILITY (decl
) = DECL_VISIBILITY (fn
);
2288 DECL_VISIBILITY_SPECIFIED (decl
) =
2289 DECL_VISIBILITY_SPECIFIED (fn
);
2293 /* Local classes in templates have CLASSTYPE_USE_TEMPLATE set,
2294 but have no TEMPLATE_INFO, so don't try to check it. */
2297 else if (VAR_P (decl
) && DECL_TINFO_P (decl
)
2298 && flag_visibility_ms_compat
)
2300 /* Under -fvisibility-ms-compat, types are visible by default,
2301 even though their contents aren't. */
2302 tree underlying_type
= TREE_TYPE (DECL_NAME (decl
));
2303 int underlying_vis
= type_visibility (underlying_type
);
2304 if (underlying_vis
== VISIBILITY_ANON
2305 || (CLASS_TYPE_P (underlying_type
)
2306 && CLASSTYPE_VISIBILITY_SPECIFIED (underlying_type
)))
2307 constrain_visibility (decl
, underlying_vis
, false);
2309 DECL_VISIBILITY (decl
) = VISIBILITY_DEFAULT
;
2311 else if (VAR_P (decl
) && DECL_TINFO_P (decl
))
2313 /* tinfo visibility is based on the type it's for. */
2314 constrain_visibility
2315 (decl
, type_visibility (TREE_TYPE (DECL_NAME (decl
))), false);
2317 /* Give the target a chance to override the visibility associated
2319 if (TREE_PUBLIC (decl
)
2320 && !DECL_REALLY_EXTERN (decl
)
2321 && CLASS_TYPE_P (TREE_TYPE (DECL_NAME (decl
)))
2322 && !CLASSTYPE_VISIBILITY_SPECIFIED (TREE_TYPE (DECL_NAME (decl
))))
2323 targetm
.cxx
.determine_class_data_visibility (decl
);
2325 else if (use_template
)
2326 /* Template instantiations and specializations get visibility based
2327 on their template unless they override it with an attribute. */;
2328 else if (! DECL_VISIBILITY_SPECIFIED (decl
))
2330 if (determine_hidden_inline (decl
))
2331 DECL_VISIBILITY (decl
) = VISIBILITY_HIDDEN
;
2334 /* Set default visibility to whatever the user supplied with
2335 #pragma GCC visibility or a namespace visibility attribute. */
2336 DECL_VISIBILITY (decl
) = default_visibility
;
2337 DECL_VISIBILITY_SPECIFIED (decl
) = visibility_options
.inpragma
;
2344 /* If the specialization doesn't specify visibility, use the
2345 visibility from the template. */
2346 tree tinfo
= get_template_info (decl
);
2347 tree args
= TI_ARGS (tinfo
);
2348 tree attribs
= (TREE_CODE (decl
) == TYPE_DECL
2349 ? TYPE_ATTRIBUTES (TREE_TYPE (decl
))
2350 : DECL_ATTRIBUTES (decl
));
2352 if (args
!= error_mark_node
)
2354 tree pattern
= DECL_TEMPLATE_RESULT (TI_TEMPLATE (tinfo
));
2356 if (!DECL_VISIBILITY_SPECIFIED (decl
))
2358 if (!DECL_VISIBILITY_SPECIFIED (pattern
)
2359 && determine_hidden_inline (decl
))
2360 DECL_VISIBILITY (decl
) = VISIBILITY_HIDDEN
;
2363 DECL_VISIBILITY (decl
) = DECL_VISIBILITY (pattern
);
2364 DECL_VISIBILITY_SPECIFIED (decl
)
2365 = DECL_VISIBILITY_SPECIFIED (pattern
);
2370 /* Template argument visibility outweighs #pragma or namespace
2371 visibility, but not an explicit attribute. */
2372 && !lookup_attribute ("visibility", attribs
))
2374 int depth
= TMPL_ARGS_DEPTH (args
);
2375 if (DECL_VISIBILITY_SPECIFIED (decl
))
2377 /* A class template member with explicit visibility
2378 overrides the class visibility, so we need to apply
2379 all the levels of template args directly. */
2381 for (i
= 1; i
<= depth
; ++i
)
2383 tree lev
= TMPL_ARGS_LEVEL (args
, i
);
2384 constrain_visibility_for_template (decl
, lev
);
2387 else if (PRIMARY_TEMPLATE_P (TI_TEMPLATE (tinfo
)))
2388 /* Limit visibility based on its template arguments. */
2389 constrain_visibility_for_template (decl
, args
);
2395 determine_visibility_from_class (decl
, class_type
);
2397 if (decl_anon_ns_mem_p (decl
))
2398 /* Names in an anonymous namespace get internal linkage.
2399 This might change once we implement export. */
2400 constrain_visibility (decl
, VISIBILITY_ANON
, false);
2401 else if (TREE_CODE (decl
) != TYPE_DECL
)
2403 /* Propagate anonymity from type to decl. */
2404 int tvis
= type_visibility (TREE_TYPE (decl
));
2405 if (tvis
== VISIBILITY_ANON
2406 || ! DECL_VISIBILITY_SPECIFIED (decl
))
2407 constrain_visibility (decl
, tvis
, false);
2409 else if (no_linkage_check (TREE_TYPE (decl
), /*relaxed_p=*/true))
2410 /* DR 757: A type without linkage shall not be used as the type of a
2411 variable or function with linkage, unless
2412 o the variable or function has extern "C" linkage (7.5 [dcl.link]), or
2413 o the variable or function is not used (3.2 [basic.def.odr]) or is
2414 defined in the same translation unit.
2416 Since non-extern "C" decls need to be defined in the same
2417 translation unit, we can make the type internal. */
2418 constrain_visibility (decl
, VISIBILITY_ANON
, false);
2420 /* If visibility changed and DECL already has DECL_RTL, ensure
2421 symbol flags are updated. */
2422 if ((DECL_VISIBILITY (decl
) != orig_visibility
2423 || DECL_VISIBILITY_SPECIFIED (decl
) != orig_visibility_specified
)
2424 && ((VAR_P (decl
) && TREE_STATIC (decl
))
2425 || TREE_CODE (decl
) == FUNCTION_DECL
)
2426 && DECL_RTL_SET_P (decl
))
2427 make_decl_rtl (decl
);
2430 /* By default, static data members and function members receive
2431 the visibility of their containing class. */
2434 determine_visibility_from_class (tree decl
, tree class_type
)
2436 if (DECL_VISIBILITY_SPECIFIED (decl
))
2439 if (determine_hidden_inline (decl
))
2440 DECL_VISIBILITY (decl
) = VISIBILITY_HIDDEN
;
2443 /* Default to the class visibility. */
2444 DECL_VISIBILITY (decl
) = CLASSTYPE_VISIBILITY (class_type
);
2445 DECL_VISIBILITY_SPECIFIED (decl
)
2446 = CLASSTYPE_VISIBILITY_SPECIFIED (class_type
);
2449 /* Give the target a chance to override the visibility associated
2452 && (DECL_TINFO_P (decl
)
2453 || (DECL_VTABLE_OR_VTT_P (decl
)
2454 /* Construction virtual tables are not exported because
2455 they cannot be referred to from other object files;
2456 their name is not standardized by the ABI. */
2457 && !DECL_CONSTRUCTION_VTABLE_P (decl
)))
2458 && TREE_PUBLIC (decl
)
2459 && !DECL_REALLY_EXTERN (decl
)
2460 && !CLASSTYPE_VISIBILITY_SPECIFIED (class_type
))
2461 targetm
.cxx
.determine_class_data_visibility (decl
);
2464 /* Returns true iff DECL is an inline that should get hidden visibility
2465 because of -fvisibility-inlines-hidden. */
2468 determine_hidden_inline (tree decl
)
2470 return (visibility_options
.inlines_hidden
2471 /* Don't do this for inline templates; specializations might not be
2472 inline, and we don't want them to inherit the hidden
2473 visibility. We'll set it here for all inline instantiations. */
2474 && !processing_template_decl
2475 && TREE_CODE (decl
) == FUNCTION_DECL
2476 && DECL_DECLARED_INLINE_P (decl
)
2477 && (! DECL_LANG_SPECIFIC (decl
)
2478 || ! DECL_EXPLICIT_INSTANTIATION (decl
)));
2481 /* Constrain the visibility of a class TYPE based on the visibility of its
2482 field types. Warn if any fields require lesser visibility. */
2485 constrain_class_visibility (tree type
)
2491 int vis
= type_visibility (type
);
2493 if (vis
== VISIBILITY_ANON
2494 || DECL_IN_SYSTEM_HEADER (TYPE_MAIN_DECL (type
)))
2497 /* Don't warn about visibility if the class has explicit visibility. */
2498 if (CLASSTYPE_VISIBILITY_SPECIFIED (type
))
2499 vis
= VISIBILITY_INTERNAL
;
2501 for (t
= TYPE_FIELDS (type
); t
; t
= DECL_CHAIN (t
))
2502 if (TREE_CODE (t
) == FIELD_DECL
&& TREE_TYPE (t
) != error_mark_node
)
2504 tree ftype
= strip_pointer_or_array_types (TREE_TYPE (t
));
2505 int subvis
= type_visibility (ftype
);
2507 if (subvis
== VISIBILITY_ANON
)
2509 if (!in_main_input_context())
2511 tree nlt
= no_linkage_check (ftype
, /*relaxed_p=*/false);
2514 if (same_type_p (TREE_TYPE (t
), nlt
))
2515 warning (OPT_Wsubobject_linkage
, "\
2516 %qT has a field %qD whose type has no linkage",
2519 warning (OPT_Wsubobject_linkage
, "\
2520 %qT has a field %qD whose type depends on the type %qT which has no linkage",
2524 warning (OPT_Wsubobject_linkage
, "\
2525 %qT has a field %qD whose type uses the anonymous namespace",
2529 else if (MAYBE_CLASS_TYPE_P (ftype
)
2530 && vis
< VISIBILITY_HIDDEN
2531 && subvis
>= VISIBILITY_HIDDEN
)
2532 warning (OPT_Wattributes
, "\
2533 %qT declared with greater visibility than the type of its field %qD",
2537 binfo
= TYPE_BINFO (type
);
2538 for (i
= 0; BINFO_BASE_ITERATE (binfo
, i
, t
); ++i
)
2540 int subvis
= type_visibility (TREE_TYPE (t
));
2542 if (subvis
== VISIBILITY_ANON
)
2544 if (!in_main_input_context())
2546 tree nlt
= no_linkage_check (TREE_TYPE (t
), /*relaxed_p=*/false);
2549 if (same_type_p (TREE_TYPE (t
), nlt
))
2550 warning (OPT_Wsubobject_linkage
, "\
2551 %qT has a base %qT whose type has no linkage",
2552 type
, TREE_TYPE (t
));
2554 warning (OPT_Wsubobject_linkage
, "\
2555 %qT has a base %qT whose type depends on the type %qT which has no linkage",
2556 type
, TREE_TYPE (t
), nlt
);
2559 warning (OPT_Wsubobject_linkage
, "\
2560 %qT has a base %qT whose type uses the anonymous namespace",
2561 type
, TREE_TYPE (t
));
2564 else if (vis
< VISIBILITY_HIDDEN
2565 && subvis
>= VISIBILITY_HIDDEN
)
2566 warning (OPT_Wattributes
, "\
2567 %qT declared with greater visibility than its base %qT",
2568 type
, TREE_TYPE (t
));
2572 /* Functions for adjusting the visibility of a tagged type and its nested
2573 types and declarations when it gets a name for linkage purposes from a
2576 static void bt_reset_linkage_1 (binding_entry
, void *);
2577 static void bt_reset_linkage_2 (binding_entry
, void *);
2579 /* First reset the visibility of all the types. */
2582 reset_type_linkage_1 (tree type
)
2584 set_linkage_according_to_type (type
, TYPE_MAIN_DECL (type
));
2585 if (CLASS_TYPE_P (type
))
2586 binding_table_foreach (CLASSTYPE_NESTED_UTDS (type
),
2587 bt_reset_linkage_1
, NULL
);
2590 bt_reset_linkage_1 (binding_entry b
, void */
*data*/
)
2592 reset_type_linkage_1 (b
->type
);
2595 /* Then reset the visibility of any static data members or member
2596 functions that use those types. */
2599 reset_decl_linkage (tree decl
)
2601 if (TREE_PUBLIC (decl
))
2603 if (DECL_CLONED_FUNCTION_P (decl
))
2605 TREE_PUBLIC (decl
) = true;
2606 DECL_INTERFACE_KNOWN (decl
) = false;
2607 determine_visibility (decl
);
2608 tentative_decl_linkage (decl
);
2611 reset_type_linkage_2 (tree type
)
2613 if (CLASS_TYPE_P (type
))
2615 if (tree vt
= CLASSTYPE_VTABLES (type
))
2617 tree name
= mangle_vtbl_for_type (type
);
2618 DECL_NAME (vt
) = name
;
2619 SET_DECL_ASSEMBLER_NAME (vt
, name
);
2620 reset_decl_linkage (vt
);
2622 if (tree ti
= CLASSTYPE_TYPEINFO_VAR (type
))
2624 tree name
= mangle_typeinfo_for_type (type
);
2625 DECL_NAME (ti
) = name
;
2626 SET_DECL_ASSEMBLER_NAME (ti
, name
);
2627 TREE_TYPE (name
) = type
;
2628 reset_decl_linkage (ti
);
2630 for (tree m
= TYPE_FIELDS (type
); m
; m
= DECL_CHAIN (m
))
2632 tree mem
= STRIP_TEMPLATE (m
);
2634 reset_decl_linkage (mem
);
2636 for (tree m
= TYPE_METHODS (type
); m
; m
= DECL_CHAIN (m
))
2638 tree mem
= STRIP_TEMPLATE (m
);
2639 reset_decl_linkage (mem
);
2640 if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (mem
))
2642 /* Also update its name, for cxx_dwarf_name. */
2643 DECL_NAME (mem
) = TYPE_IDENTIFIER (type
);
2645 DECL_NAME (m
) = TYPE_IDENTIFIER (type
);
2648 binding_table_foreach (CLASSTYPE_NESTED_UTDS (type
),
2649 bt_reset_linkage_2
, NULL
);
2653 bt_reset_linkage_2 (binding_entry b
, void */
*data*/
)
2655 reset_type_linkage_2 (b
->type
);
2658 reset_type_linkage (tree type
)
2660 reset_type_linkage_1 (type
);
2661 reset_type_linkage_2 (type
);
2664 /* Set up our initial idea of what the linkage of DECL should be. */
2667 tentative_decl_linkage (tree decl
)
2669 if (DECL_INTERFACE_KNOWN (decl
))
2670 /* We've already made a decision as to how this function will
2672 else if (vague_linkage_p (decl
))
2674 if (TREE_CODE (decl
) == FUNCTION_DECL
2675 && decl_defined_p (decl
))
2677 DECL_EXTERNAL (decl
) = 1;
2678 DECL_NOT_REALLY_EXTERN (decl
) = 1;
2679 note_vague_linkage_fn (decl
);
2680 /* A non-template inline function with external linkage will
2681 always be COMDAT. As we must eventually determine the
2682 linkage of all functions, and as that causes writes to
2683 the data mapped in from the PCH file, it's advantageous
2684 to mark the functions at this point. */
2685 if (DECL_DECLARED_INLINE_P (decl
)
2686 && (!DECL_IMPLICIT_INSTANTIATION (decl
)
2687 || DECL_DEFAULTED_FN (decl
)))
2689 /* This function must have external linkage, as
2690 otherwise DECL_INTERFACE_KNOWN would have been
2692 gcc_assert (TREE_PUBLIC (decl
));
2693 comdat_linkage (decl
);
2694 DECL_INTERFACE_KNOWN (decl
) = 1;
2697 else if (VAR_P (decl
))
2698 maybe_commonize_var (decl
);
2702 /* DECL is a FUNCTION_DECL or VAR_DECL. If the object file linkage
2703 for DECL has not already been determined, do so now by setting
2704 DECL_EXTERNAL, DECL_COMDAT and other related flags. Until this
2705 function is called entities with vague linkage whose definitions
2706 are available must have TREE_PUBLIC set.
2708 If this function decides to place DECL in COMDAT, it will set
2709 appropriate flags -- but will not clear DECL_EXTERNAL. It is up to
2710 the caller to decide whether or not to clear DECL_EXTERNAL. Some
2711 callers defer that decision until it is clear that DECL is actually
2715 import_export_decl (tree decl
)
2720 tree class_type
= NULL_TREE
;
2722 if (DECL_INTERFACE_KNOWN (decl
))
2725 /* We cannot determine what linkage to give to an entity with vague
2726 linkage until the end of the file. For example, a virtual table
2727 for a class will be defined if and only if the key method is
2728 defined in this translation unit. As a further example, consider
2729 that when compiling a translation unit that uses PCH file with
2730 "-frepo" it would be incorrect to make decisions about what
2731 entities to emit when building the PCH; those decisions must be
2732 delayed until the repository information has been processed. */
2733 gcc_assert (at_eof
);
2734 /* Object file linkage for explicit instantiations is handled in
2735 mark_decl_instantiated. For static variables in functions with
2736 vague linkage, maybe_commonize_var is used.
2738 Therefore, the only declarations that should be provided to this
2739 function are those with external linkage that are:
2741 * implicit instantiations of function templates
2745 * implicit instantiations of static data members of class
2752 Furthermore, all entities that reach this point must have a
2753 definition available in this translation unit.
2755 The following assertions check these conditions. */
2756 gcc_assert (VAR_OR_FUNCTION_DECL_P (decl
));
2757 /* Any code that creates entities with TREE_PUBLIC cleared should
2758 also set DECL_INTERFACE_KNOWN. */
2759 gcc_assert (TREE_PUBLIC (decl
));
2760 if (TREE_CODE (decl
) == FUNCTION_DECL
)
2761 gcc_assert (DECL_IMPLICIT_INSTANTIATION (decl
)
2762 || DECL_FRIEND_PSEUDO_TEMPLATE_INSTANTIATION (decl
)
2763 || DECL_DECLARED_INLINE_P (decl
));
2765 gcc_assert (DECL_IMPLICIT_INSTANTIATION (decl
)
2766 || DECL_VTABLE_OR_VTT_P (decl
)
2767 || DECL_TINFO_P (decl
));
2768 /* Check that a definition of DECL is available in this translation
2770 gcc_assert (!DECL_REALLY_EXTERN (decl
));
2772 /* Assume that DECL will not have COMDAT linkage. */
2774 /* Assume that DECL will not be imported into this translation
2778 /* See if the repository tells us whether or not to emit DECL in
2779 this translation unit. */
2780 emit_p
= repo_emit_p (decl
);
2783 else if (emit_p
== 1)
2785 /* The repository indicates that this entity should be defined
2786 here. Make sure the back end honors that request. */
2788 /* Output the definition as an ordinary strong definition. */
2789 DECL_EXTERNAL (decl
) = 0;
2790 DECL_INTERFACE_KNOWN (decl
) = 1;
2795 /* We have already decided what to do with this DECL; there is no
2796 need to check anything further. */
2798 else if (VAR_P (decl
) && DECL_VTABLE_OR_VTT_P (decl
))
2800 class_type
= DECL_CONTEXT (decl
);
2801 import_export_class (class_type
);
2802 if (CLASSTYPE_INTERFACE_KNOWN (class_type
)
2803 && CLASSTYPE_INTERFACE_ONLY (class_type
))
2805 else if ((!flag_weak
|| TARGET_WEAK_NOT_IN_ARCHIVE_TOC
)
2806 && !CLASSTYPE_USE_TEMPLATE (class_type
)
2807 && CLASSTYPE_KEY_METHOD (class_type
)
2808 && !DECL_DECLARED_INLINE_P (CLASSTYPE_KEY_METHOD (class_type
)))
2809 /* The ABI requires that all virtual tables be emitted with
2810 COMDAT linkage. However, on systems where COMDAT symbols
2811 don't show up in the table of contents for a static
2812 archive, or on systems without weak symbols (where we
2813 approximate COMDAT linkage by using internal linkage), the
2814 linker will report errors about undefined symbols because
2815 it will not see the virtual table definition. Therefore,
2816 in the case that we know that the virtual table will be
2817 emitted in only one translation unit, we make the virtual
2818 table an ordinary definition with external linkage. */
2819 DECL_EXTERNAL (decl
) = 0;
2820 else if (CLASSTYPE_INTERFACE_KNOWN (class_type
))
2822 /* CLASS_TYPE is being exported from this translation unit,
2823 so DECL should be defined here. */
2824 if (!flag_weak
&& CLASSTYPE_EXPLICIT_INSTANTIATION (class_type
))
2825 /* If a class is declared in a header with the "extern
2826 template" extension, then it will not be instantiated,
2827 even in translation units that would normally require
2828 it. Often such classes are explicitly instantiated in
2829 one translation unit. Therefore, the explicit
2830 instantiation must be made visible to other translation
2832 DECL_EXTERNAL (decl
) = 0;
2835 /* The generic C++ ABI says that class data is always
2836 COMDAT, even if there is a key function. Some
2837 variants (e.g., the ARM EABI) says that class data
2838 only has COMDAT linkage if the class data might be
2839 emitted in more than one translation unit. When the
2840 key method can be inline and is inline, we still have
2841 to arrange for comdat even though
2842 class_data_always_comdat is false. */
2843 if (!CLASSTYPE_KEY_METHOD (class_type
)
2844 || DECL_DECLARED_INLINE_P (CLASSTYPE_KEY_METHOD (class_type
))
2845 || targetm
.cxx
.class_data_always_comdat ())
2847 /* The ABI requires COMDAT linkage. Normally, we
2848 only emit COMDAT things when they are needed;
2849 make sure that we realize that this entity is
2856 else if (!flag_implicit_templates
2857 && CLASSTYPE_IMPLICIT_INSTANTIATION (class_type
))
2862 else if (VAR_P (decl
) && DECL_TINFO_P (decl
))
2864 tree type
= TREE_TYPE (DECL_NAME (decl
));
2865 if (CLASS_TYPE_P (type
))
2868 import_export_class (type
);
2869 if (CLASSTYPE_INTERFACE_KNOWN (type
)
2870 && TYPE_POLYMORPHIC_P (type
)
2871 && CLASSTYPE_INTERFACE_ONLY (type
)
2872 /* If -fno-rtti was specified, then we cannot be sure
2873 that RTTI information will be emitted with the
2874 virtual table of the class, so we must emit it
2875 wherever it is used. */
2880 if (CLASSTYPE_INTERFACE_KNOWN (type
)
2881 && !CLASSTYPE_INTERFACE_ONLY (type
))
2883 comdat_p
= (targetm
.cxx
.class_data_always_comdat ()
2884 || (CLASSTYPE_KEY_METHOD (type
)
2885 && DECL_DECLARED_INLINE_P (CLASSTYPE_KEY_METHOD (type
))));
2890 DECL_EXTERNAL (decl
) = 0;
2900 else if (DECL_TEMPLOID_INSTANTIATION (decl
))
2902 /* DECL is an implicit instantiation of a function or static
2904 if ((flag_implicit_templates
2905 && !flag_use_repository
)
2906 || (flag_implicit_inline_templates
2907 && TREE_CODE (decl
) == FUNCTION_DECL
2908 && DECL_DECLARED_INLINE_P (decl
)))
2911 /* If we are not implicitly generating templates, then mark
2912 this entity as undefined in this translation unit. */
2915 else if (DECL_FUNCTION_MEMBER_P (decl
))
2917 if (!DECL_DECLARED_INLINE_P (decl
))
2919 tree ctype
= DECL_CONTEXT (decl
);
2920 import_export_class (ctype
);
2921 if (CLASSTYPE_INTERFACE_KNOWN (ctype
))
2923 DECL_NOT_REALLY_EXTERN (decl
)
2924 = ! (CLASSTYPE_INTERFACE_ONLY (ctype
)
2925 || (DECL_DECLARED_INLINE_P (decl
)
2926 && ! flag_implement_inlines
2927 && !DECL_VINDEX (decl
)));
2929 if (!DECL_NOT_REALLY_EXTERN (decl
))
2930 DECL_EXTERNAL (decl
) = 1;
2932 /* Always make artificials weak. */
2933 if (DECL_ARTIFICIAL (decl
) && flag_weak
)
2936 maybe_make_one_only (decl
);
2947 /* If we are importing DECL into this translation unit, mark is
2948 an undefined here. */
2949 DECL_EXTERNAL (decl
) = 1;
2950 DECL_NOT_REALLY_EXTERN (decl
) = 0;
2954 /* If we decided to put DECL in COMDAT, mark it accordingly at
2956 comdat_linkage (decl
);
2959 DECL_INTERFACE_KNOWN (decl
) = 1;
2962 /* Return an expression that performs the destruction of DECL, which
2963 must be a VAR_DECL whose type has a non-trivial destructor, or is
2964 an array whose (innermost) elements have a non-trivial destructor. */
2967 build_cleanup (tree decl
)
2969 tree clean
= cxx_maybe_build_cleanup (decl
, tf_warning_or_error
);
2970 gcc_assert (clean
!= NULL_TREE
);
2974 /* Returns the initialization guard variable for the variable DECL,
2975 which has static storage duration. */
2978 get_guard (tree decl
)
2983 sname
= mangle_guard_variable (decl
);
2984 guard
= IDENTIFIER_GLOBAL_VALUE (sname
);
2989 /* We use a type that is big enough to contain a mutex as well
2990 as an integer counter. */
2991 guard_type
= targetm
.cxx
.guard_type ();
2992 guard
= build_decl (DECL_SOURCE_LOCATION (decl
),
2993 VAR_DECL
, sname
, guard_type
);
2995 /* The guard should have the same linkage as what it guards. */
2996 TREE_PUBLIC (guard
) = TREE_PUBLIC (decl
);
2997 TREE_STATIC (guard
) = TREE_STATIC (decl
);
2998 DECL_COMMON (guard
) = DECL_COMMON (decl
);
2999 DECL_COMDAT (guard
) = DECL_COMDAT (decl
);
3000 CP_DECL_THREAD_LOCAL_P (guard
) = CP_DECL_THREAD_LOCAL_P (decl
);
3001 set_decl_tls_model (guard
, DECL_TLS_MODEL (decl
));
3002 if (DECL_ONE_ONLY (decl
))
3003 make_decl_one_only (guard
, cxx_comdat_group (guard
));
3004 if (TREE_PUBLIC (decl
))
3005 DECL_WEAK (guard
) = DECL_WEAK (decl
);
3006 DECL_VISIBILITY (guard
) = DECL_VISIBILITY (decl
);
3007 DECL_VISIBILITY_SPECIFIED (guard
) = DECL_VISIBILITY_SPECIFIED (decl
);
3009 DECL_ARTIFICIAL (guard
) = 1;
3010 DECL_IGNORED_P (guard
) = 1;
3011 TREE_USED (guard
) = 1;
3012 pushdecl_top_level_and_finish (guard
, NULL_TREE
);
3017 /* Return an atomic load of src with the appropriate memory model. */
3020 build_atomic_load_byte (tree src
, HOST_WIDE_INT model
)
3022 tree ptr_type
= build_pointer_type (char_type_node
);
3023 tree mem_model
= build_int_cst (integer_type_node
, model
);
3028 size
= tree_to_uhwi (TYPE_SIZE_UNIT (char_type_node
));
3030 fncode
= BUILT_IN_ATOMIC_LOAD_N
+ exact_log2 (size
) + 1;
3031 t
= builtin_decl_implicit ((enum built_in_function
) fncode
);
3033 addr
= build1 (ADDR_EXPR
, ptr_type
, src
);
3034 val
= build_call_expr (t
, 2, addr
, mem_model
);
3038 /* Return those bits of the GUARD variable that should be set when the
3039 guarded entity is actually initialized. */
3042 get_guard_bits (tree guard
)
3044 if (!targetm
.cxx
.guard_mask_bit ())
3046 /* We only set the first byte of the guard, in order to leave room
3047 for a mutex in the high-order bits. */
3048 guard
= build1 (ADDR_EXPR
,
3049 build_pointer_type (TREE_TYPE (guard
)),
3051 guard
= build1 (NOP_EXPR
,
3052 build_pointer_type (char_type_node
),
3054 guard
= build1 (INDIRECT_REF
, char_type_node
, guard
);
3060 /* Return an expression which determines whether or not the GUARD
3061 variable has already been initialized. */
3064 get_guard_cond (tree guard
, bool thread_safe
)
3069 guard
= get_guard_bits (guard
);
3071 guard
= build_atomic_load_byte (guard
, MEMMODEL_ACQUIRE
);
3073 /* Mask off all but the low bit. */
3074 if (targetm
.cxx
.guard_mask_bit ())
3076 guard_value
= integer_one_node
;
3077 if (!same_type_p (TREE_TYPE (guard_value
), TREE_TYPE (guard
)))
3078 guard_value
= fold_convert (TREE_TYPE (guard
), guard_value
);
3079 guard
= cp_build_binary_op (input_location
,
3080 BIT_AND_EXPR
, guard
, guard_value
,
3081 tf_warning_or_error
);
3084 guard_value
= integer_zero_node
;
3085 if (!same_type_p (TREE_TYPE (guard_value
), TREE_TYPE (guard
)))
3086 guard_value
= fold_convert (TREE_TYPE (guard
), guard_value
);
3087 return cp_build_binary_op (input_location
,
3088 EQ_EXPR
, guard
, guard_value
,
3089 tf_warning_or_error
);
3092 /* Return an expression which sets the GUARD variable, indicating that
3093 the variable being guarded has been initialized. */
3096 set_guard (tree guard
)
3100 /* Set the GUARD to one. */
3101 guard
= get_guard_bits (guard
);
3102 guard_init
= integer_one_node
;
3103 if (!same_type_p (TREE_TYPE (guard_init
), TREE_TYPE (guard
)))
3104 guard_init
= fold_convert (TREE_TYPE (guard
), guard_init
);
3105 return cp_build_modify_expr (input_location
, guard
, NOP_EXPR
, guard_init
,
3106 tf_warning_or_error
);
3109 /* Returns true iff we can tell that VAR does not have a dynamic
3113 var_defined_without_dynamic_init (tree var
)
3115 /* If it's defined in another TU, we can't tell. */
3116 if (DECL_EXTERNAL (var
))
3118 /* If it has a non-trivial destructor, registering the destructor
3119 counts as dynamic initialization. */
3120 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (TREE_TYPE (var
)))
3122 /* If it's in this TU, its initializer has been processed, unless
3123 it's a case of self-initialization, then DECL_INITIALIZED_P is
3124 false while the initializer is handled by finish_id_expression. */
3125 if (!DECL_INITIALIZED_P (var
))
3127 /* If it has no initializer or a constant one, it's not dynamic. */
3128 return (!DECL_NONTRIVIALLY_INITIALIZED_P (var
)
3129 || DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (var
));
3132 /* Returns true iff VAR is a variable that needs uses to be
3133 wrapped for possible dynamic initialization. */
3136 var_needs_tls_wrapper (tree var
)
3138 return (!error_operand_p (var
)
3139 && CP_DECL_THREAD_LOCAL_P (var
)
3140 && !DECL_GNU_TLS_P (var
)
3141 && !DECL_FUNCTION_SCOPE_P (var
)
3142 && !var_defined_without_dynamic_init (var
));
3145 /* Get the FUNCTION_DECL for the shared TLS init function for this
3146 translation unit. */
3149 get_local_tls_init_fn (void)
3151 tree sname
= get_identifier ("__tls_init");
3152 tree fn
= IDENTIFIER_GLOBAL_VALUE (sname
);
3155 fn
= build_lang_decl (FUNCTION_DECL
, sname
,
3156 build_function_type (void_type_node
,
3158 SET_DECL_LANGUAGE (fn
, lang_c
);
3159 TREE_PUBLIC (fn
) = false;
3160 DECL_ARTIFICIAL (fn
) = true;
3162 SET_IDENTIFIER_GLOBAL_VALUE (sname
, fn
);
3167 /* Get a FUNCTION_DECL for the init function for the thread_local
3168 variable VAR. The init function will be an alias to the function
3169 that initializes all the non-local TLS variables in the translation
3170 unit. The init function is only used by the wrapper function. */
3173 get_tls_init_fn (tree var
)
3175 /* Only C++11 TLS vars need this init fn. */
3176 if (!var_needs_tls_wrapper (var
))
3179 /* If -fno-extern-tls-init, assume that we don't need to call
3180 a tls init function for a variable defined in another TU. */
3181 if (!flag_extern_tls_init
&& DECL_EXTERNAL (var
))
3184 #ifdef ASM_OUTPUT_DEF
3185 /* If the variable is internal, or if we can't generate aliases,
3186 call the local init function directly. */
3187 if (!TREE_PUBLIC (var
))
3189 return get_local_tls_init_fn ();
3191 tree sname
= mangle_tls_init_fn (var
);
3192 tree fn
= IDENTIFIER_GLOBAL_VALUE (sname
);
3195 fn
= build_lang_decl (FUNCTION_DECL
, sname
,
3196 build_function_type (void_type_node
,
3198 SET_DECL_LANGUAGE (fn
, lang_c
);
3199 TREE_PUBLIC (fn
) = TREE_PUBLIC (var
);
3200 DECL_ARTIFICIAL (fn
) = true;
3201 DECL_COMDAT (fn
) = DECL_COMDAT (var
);
3202 DECL_EXTERNAL (fn
) = DECL_EXTERNAL (var
);
3203 if (DECL_ONE_ONLY (var
))
3204 make_decl_one_only (fn
, cxx_comdat_group (fn
));
3205 if (TREE_PUBLIC (var
))
3207 tree obtype
= strip_array_types (non_reference (TREE_TYPE (var
)));
3208 /* If the variable is defined somewhere else and might have static
3209 initialization, make the init function a weak reference. */
3210 if ((!TYPE_NEEDS_CONSTRUCTING (obtype
)
3211 || TYPE_HAS_CONSTEXPR_CTOR (obtype
))
3212 && TYPE_HAS_TRIVIAL_DESTRUCTOR (obtype
)
3213 && DECL_EXTERNAL (var
))
3216 DECL_WEAK (fn
) = DECL_WEAK (var
);
3218 DECL_VISIBILITY (fn
) = DECL_VISIBILITY (var
);
3219 DECL_VISIBILITY_SPECIFIED (fn
) = DECL_VISIBILITY_SPECIFIED (var
);
3220 DECL_DLLIMPORT_P (fn
) = DECL_DLLIMPORT_P (var
);
3221 DECL_IGNORED_P (fn
) = 1;
3224 DECL_BEFRIENDING_CLASSES (fn
) = var
;
3226 SET_IDENTIFIER_GLOBAL_VALUE (sname
, fn
);
3231 /* Get a FUNCTION_DECL for the init wrapper function for the thread_local
3232 variable VAR. The wrapper function calls the init function (if any) for
3233 VAR and then returns a reference to VAR. The wrapper function is used
3234 in place of VAR everywhere VAR is mentioned. */
3237 get_tls_wrapper_fn (tree var
)
3239 /* Only C++11 TLS vars need this wrapper fn. */
3240 if (!var_needs_tls_wrapper (var
))
3243 tree sname
= mangle_tls_wrapper_fn (var
);
3244 tree fn
= IDENTIFIER_GLOBAL_VALUE (sname
);
3247 /* A named rvalue reference is an lvalue, so the wrapper should
3248 always return an lvalue reference. */
3249 tree type
= non_reference (TREE_TYPE (var
));
3250 type
= build_reference_type (type
);
3251 tree fntype
= build_function_type (type
, void_list_node
);
3252 fn
= build_lang_decl (FUNCTION_DECL
, sname
, fntype
);
3253 SET_DECL_LANGUAGE (fn
, lang_c
);
3254 TREE_PUBLIC (fn
) = TREE_PUBLIC (var
);
3255 DECL_ARTIFICIAL (fn
) = true;
3256 DECL_IGNORED_P (fn
) = 1;
3257 /* The wrapper is inline and emitted everywhere var is used. */
3258 DECL_DECLARED_INLINE_P (fn
) = true;
3259 if (TREE_PUBLIC (var
))
3261 comdat_linkage (fn
);
3262 #ifdef HAVE_GAS_HIDDEN
3263 /* Make the wrapper bind locally; there's no reason to share
3264 the wrapper between multiple shared objects. */
3265 DECL_VISIBILITY (fn
) = VISIBILITY_INTERNAL
;
3266 DECL_VISIBILITY_SPECIFIED (fn
) = true;
3269 if (!TREE_PUBLIC (fn
))
3270 DECL_INTERFACE_KNOWN (fn
) = true;
3272 note_vague_linkage_fn (fn
);
3275 /* We want CSE to commonize calls to the wrapper, but marking it as
3276 pure is unsafe since it has side-effects. I guess we need a new
3277 ECF flag even weaker than ECF_PURE. FIXME! */
3278 DECL_PURE_P (fn
) = true;
3281 DECL_BEFRIENDING_CLASSES (fn
) = var
;
3283 SET_IDENTIFIER_GLOBAL_VALUE (sname
, fn
);
3288 /* At EOF, generate the definition for the TLS wrapper function FN:
3291 if (init_fn) init_fn();
3296 generate_tls_wrapper (tree fn
)
3298 tree var
= DECL_BEFRIENDING_CLASSES (fn
);
3300 start_preparsed_function (fn
, NULL_TREE
, SF_DEFAULT
| SF_PRE_PARSED
);
3301 tree body
= begin_function_body ();
3302 /* Only call the init fn if there might be one. */
3303 if (tree init_fn
= get_tls_init_fn (var
))
3305 tree if_stmt
= NULL_TREE
;
3306 /* If init_fn is a weakref, make sure it exists before calling. */
3307 if (lookup_attribute ("weak", DECL_ATTRIBUTES (init_fn
)))
3309 if_stmt
= begin_if_stmt ();
3310 tree addr
= cp_build_addr_expr (init_fn
, tf_warning_or_error
);
3311 tree cond
= cp_build_binary_op (DECL_SOURCE_LOCATION (var
),
3312 NE_EXPR
, addr
, nullptr_node
,
3313 tf_warning_or_error
);
3314 finish_if_stmt_cond (cond
, if_stmt
);
3316 finish_expr_stmt (build_cxx_call
3317 (init_fn
, 0, NULL
, tf_warning_or_error
));
3320 finish_then_clause (if_stmt
);
3321 finish_if_stmt (if_stmt
);
3325 /* If there's no initialization, the wrapper is a constant function. */
3326 TREE_READONLY (fn
) = true;
3327 finish_return_stmt (convert_from_reference (var
));
3328 finish_function_body (body
);
3329 expand_or_defer_fn (finish_function (0));
3332 /* Start the process of running a particular set of global constructors
3333 or destructors. Subroutine of do_[cd]tors. Also called from
3334 vtv_start_verification_constructor_init_function. */
3337 start_objects (int method_type
, int initp
)
3343 /* Make ctor or dtor function. METHOD_TYPE may be 'I' or 'D'. */
3345 if (initp
!= DEFAULT_INIT_PRIORITY
)
3355 sprintf (type
, "sub_%c%c%.5u", method_type
, joiner
, initp
);
3358 sprintf (type
, "sub_%c", method_type
);
3360 fndecl
= build_lang_decl (FUNCTION_DECL
,
3361 get_file_function_name (type
),
3362 build_function_type_list (void_type_node
,
3364 start_preparsed_function (fndecl
, /*attrs=*/NULL_TREE
, SF_PRE_PARSED
);
3366 TREE_PUBLIC (current_function_decl
) = 0;
3368 /* Mark as artificial because it's not explicitly in the user's
3370 DECL_ARTIFICIAL (current_function_decl
) = 1;
3372 /* Mark this declaration as used to avoid spurious warnings. */
3373 TREE_USED (current_function_decl
) = 1;
3375 /* Mark this function as a global constructor or destructor. */
3376 if (method_type
== 'I')
3377 DECL_GLOBAL_CTOR_P (current_function_decl
) = 1;
3379 DECL_GLOBAL_DTOR_P (current_function_decl
) = 1;
3381 body
= begin_compound_stmt (BCS_FN_BODY
);
3386 /* Finish the process of running a particular set of global constructors
3387 or destructors. Subroutine of do_[cd]tors. */
3390 finish_objects (int method_type
, int initp
, tree body
)
3395 finish_compound_stmt (body
);
3396 fn
= finish_function (0);
3398 if (method_type
== 'I')
3400 DECL_STATIC_CONSTRUCTOR (fn
) = 1;
3401 decl_init_priority_insert (fn
, initp
);
3405 DECL_STATIC_DESTRUCTOR (fn
) = 1;
3406 decl_fini_priority_insert (fn
, initp
);
3409 expand_or_defer_fn (fn
);
3412 /* The names of the parameters to the function created to handle
3413 initializations and destructions for objects with static storage
3415 #define INITIALIZE_P_IDENTIFIER "__initialize_p"
3416 #define PRIORITY_IDENTIFIER "__priority"
3418 /* The name of the function we create to handle initializations and
3419 destructions for objects with static storage duration. */
3420 #define SSDF_IDENTIFIER "__static_initialization_and_destruction"
3422 /* The declaration for the __INITIALIZE_P argument. */
3423 static GTY(()) tree initialize_p_decl
;
3425 /* The declaration for the __PRIORITY argument. */
3426 static GTY(()) tree priority_decl
;
3428 /* The declaration for the static storage duration function. */
3429 static GTY(()) tree ssdf_decl
;
3431 /* All the static storage duration functions created in this
3432 translation unit. */
3433 static GTY(()) vec
<tree
, va_gc
> *ssdf_decls
;
3435 /* A map from priority levels to information about that priority
3436 level. There may be many such levels, so efficient lookup is
3438 static splay_tree priority_info_map
;
3440 /* Begins the generation of the function that will handle all
3441 initialization and destruction of objects with static storage
3442 duration. The function generated takes two parameters of type
3443 `int': __INITIALIZE_P and __PRIORITY. If __INITIALIZE_P is
3444 nonzero, it performs initializations. Otherwise, it performs
3445 destructions. It only performs those initializations or
3446 destructions with the indicated __PRIORITY. The generated function
3449 It is assumed that this function will only be called once per
3450 translation unit. */
3453 start_static_storage_duration_function (unsigned count
)
3457 char id
[sizeof (SSDF_IDENTIFIER
) + 1 /* '\0' */ + 32];
3459 /* Create the identifier for this function. It will be of the form
3460 SSDF_IDENTIFIER_<number>. */
3461 sprintf (id
, "%s_%u", SSDF_IDENTIFIER
, count
);
3463 type
= build_function_type_list (void_type_node
,
3464 integer_type_node
, integer_type_node
,
3467 /* Create the FUNCTION_DECL itself. */
3468 ssdf_decl
= build_lang_decl (FUNCTION_DECL
,
3469 get_identifier (id
),
3471 TREE_PUBLIC (ssdf_decl
) = 0;
3472 DECL_ARTIFICIAL (ssdf_decl
) = 1;
3474 /* Put this function in the list of functions to be called from the
3475 static constructors and destructors. */
3478 vec_alloc (ssdf_decls
, 32);
3480 /* Take this opportunity to initialize the map from priority
3481 numbers to information about that priority level. */
3482 priority_info_map
= splay_tree_new (splay_tree_compare_ints
,
3483 /*delete_key_fn=*/0,
3484 /*delete_value_fn=*/
3485 (splay_tree_delete_value_fn
) &free
);
3487 /* We always need to generate functions for the
3488 DEFAULT_INIT_PRIORITY so enter it now. That way when we walk
3489 priorities later, we'll be sure to find the
3490 DEFAULT_INIT_PRIORITY. */
3491 get_priority_info (DEFAULT_INIT_PRIORITY
);
3494 vec_safe_push (ssdf_decls
, ssdf_decl
);
3496 /* Create the argument list. */
3497 initialize_p_decl
= cp_build_parm_decl
3498 (get_identifier (INITIALIZE_P_IDENTIFIER
), integer_type_node
);
3499 DECL_CONTEXT (initialize_p_decl
) = ssdf_decl
;
3500 TREE_USED (initialize_p_decl
) = 1;
3501 priority_decl
= cp_build_parm_decl
3502 (get_identifier (PRIORITY_IDENTIFIER
), integer_type_node
);
3503 DECL_CONTEXT (priority_decl
) = ssdf_decl
;
3504 TREE_USED (priority_decl
) = 1;
3506 DECL_CHAIN (initialize_p_decl
) = priority_decl
;
3507 DECL_ARGUMENTS (ssdf_decl
) = initialize_p_decl
;
3509 /* Put the function in the global scope. */
3510 pushdecl (ssdf_decl
);
3512 /* Start the function itself. This is equivalent to declaring the
3515 static void __ssdf (int __initialize_p, init __priority_p);
3517 It is static because we only need to call this function from the
3518 various constructor and destructor functions for this module. */
3519 start_preparsed_function (ssdf_decl
,
3520 /*attrs=*/NULL_TREE
,
3523 /* Set up the scope of the outermost block in the function. */
3524 body
= begin_compound_stmt (BCS_FN_BODY
);
3529 /* Finish the generation of the function which performs initialization
3530 and destruction of objects with static storage duration. After
3531 this point, no more such objects can be created. */
3534 finish_static_storage_duration_function (tree body
)
3536 /* Close out the function. */
3537 finish_compound_stmt (body
);
3538 expand_or_defer_fn (finish_function (0));
3541 /* Return the information about the indicated PRIORITY level. If no
3542 code to handle this level has yet been generated, generate the
3543 appropriate prologue. */
3545 static priority_info
3546 get_priority_info (int priority
)
3551 n
= splay_tree_lookup (priority_info_map
,
3552 (splay_tree_key
) priority
);
3555 /* Create a new priority information structure, and insert it
3557 pi
= XNEW (struct priority_info_s
);
3558 pi
->initializations_p
= 0;
3559 pi
->destructions_p
= 0;
3560 splay_tree_insert (priority_info_map
,
3561 (splay_tree_key
) priority
,
3562 (splay_tree_value
) pi
);
3565 pi
= (priority_info
) n
->value
;
3570 /* The effective initialization priority of a DECL. */
3572 #define DECL_EFFECTIVE_INIT_PRIORITY(decl) \
3573 ((!DECL_HAS_INIT_PRIORITY_P (decl) || DECL_INIT_PRIORITY (decl) == 0) \
3574 ? DEFAULT_INIT_PRIORITY : DECL_INIT_PRIORITY (decl))
3576 /* Whether a DECL needs a guard to protect it against multiple
3579 #define NEEDS_GUARD_P(decl) (TREE_PUBLIC (decl) && (DECL_COMMON (decl) \
3580 || DECL_ONE_ONLY (decl) \
3581 || DECL_WEAK (decl)))
3583 /* Called from one_static_initialization_or_destruction(),
3585 Walks the initializer list of a global variable and looks for
3586 temporary variables (DECL_NAME() == NULL and DECL_ARTIFICIAL != 0)
3587 and that have their DECL_CONTEXT() == NULL.
3588 For each such temporary variable, set their DECL_CONTEXT() to
3589 the current function. This is necessary because otherwise
3590 some optimizers (enabled by -O2 -fprofile-arcs) might crash
3591 when trying to refer to a temporary variable that does not have
3592 it's DECL_CONTECT() properly set. */
3594 fix_temporary_vars_context_r (tree
*node
,
3598 gcc_assert (current_function_decl
);
3600 if (TREE_CODE (*node
) == BIND_EXPR
)
3604 for (var
= BIND_EXPR_VARS (*node
); var
; var
= DECL_CHAIN (var
))
3607 && DECL_ARTIFICIAL (var
)
3608 && !DECL_CONTEXT (var
))
3609 DECL_CONTEXT (var
) = current_function_decl
;
3615 /* Set up to handle the initialization or destruction of DECL. If
3616 INITP is nonzero, we are initializing the variable. Otherwise, we
3617 are destroying it. */
3620 one_static_initialization_or_destruction (tree decl
, tree init
, bool initp
)
3622 tree guard_if_stmt
= NULL_TREE
;
3625 /* If we are supposed to destruct and there's a trivial destructor,
3626 nothing has to be done. */
3628 && TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl
)))
3631 /* Trick the compiler into thinking we are at the file and line
3632 where DECL was declared so that error-messages make sense, and so
3633 that the debugger will show somewhat sensible file and line
3635 input_location
= DECL_SOURCE_LOCATION (decl
);
3637 /* Make sure temporary variables in the initialiser all have
3638 their DECL_CONTEXT() set to a value different from NULL_TREE.
3639 This can happen when global variables initialisers are built.
3640 In that case, the DECL_CONTEXT() of the global variables _AND_ of all
3641 the temporary variables that might have been generated in the
3642 accompagning initialisers is NULL_TREE, meaning the variables have been
3643 declared in the global namespace.
3644 What we want to do here is to fix that and make sure the DECL_CONTEXT()
3645 of the temporaries are set to the current function decl. */
3646 cp_walk_tree_without_duplicates (&init
,
3647 fix_temporary_vars_context_r
,
3654 Access control for implicit calls to the constructors,
3655 the conversion functions, or the destructor called to
3656 create and destroy a static data member is performed as
3657 if these calls appeared in the scope of the member's
3660 we pretend we are in a static member function of the class of
3661 which the DECL is a member. */
3662 if (member_p (decl
))
3664 DECL_CONTEXT (current_function_decl
) = DECL_CONTEXT (decl
);
3665 DECL_STATIC_FUNCTION_P (current_function_decl
) = 1;
3668 /* Assume we don't need a guard. */
3670 /* We need a guard if this is an object with external linkage that
3671 might be initialized in more than one place. (For example, a
3672 static data member of a template, when the data member requires
3674 if (NEEDS_GUARD_P (decl
))
3678 guard
= get_guard (decl
);
3680 /* When using __cxa_atexit, we just check the GUARD as we would
3681 for a local static. */
3682 if (flag_use_cxa_atexit
)
3684 /* When using __cxa_atexit, we never try to destroy
3685 anything from a static destructor. */
3687 guard_cond
= get_guard_cond (guard
, false);
3689 /* If we don't have __cxa_atexit, then we will be running
3690 destructors from .fini sections, or their equivalents. So,
3691 we need to know how many times we've tried to initialize this
3692 object. We do initializations only if the GUARD is zero,
3693 i.e., if we are the first to initialize the variable. We do
3694 destructions only if the GUARD is one, i.e., if we are the
3695 last to destroy the variable. */
3698 = cp_build_binary_op (input_location
,
3700 cp_build_unary_op (PREINCREMENT_EXPR
,
3703 tf_warning_or_error
),
3705 tf_warning_or_error
);
3708 = cp_build_binary_op (input_location
,
3710 cp_build_unary_op (PREDECREMENT_EXPR
,
3713 tf_warning_or_error
),
3715 tf_warning_or_error
);
3717 guard_if_stmt
= begin_if_stmt ();
3718 finish_if_stmt_cond (guard_cond
, guard_if_stmt
);
3722 /* If we're using __cxa_atexit, we have not already set the GUARD,
3723 so we must do so now. */
3724 if (guard
&& initp
&& flag_use_cxa_atexit
)
3725 finish_expr_stmt (set_guard (guard
));
3727 /* Perform the initialization or destruction. */
3732 finish_expr_stmt (init
);
3733 if (flag_sanitize
& SANITIZE_ADDRESS
)
3735 varpool_node
*vnode
= varpool_node::get (decl
);
3737 vnode
->dynamically_initialized
= 1;
3741 /* If we're using __cxa_atexit, register a function that calls the
3742 destructor for the object. */
3743 if (flag_use_cxa_atexit
)
3744 finish_expr_stmt (register_dtor_fn (decl
));
3747 finish_expr_stmt (build_cleanup (decl
));
3749 /* Finish the guard if-stmt, if necessary. */
3752 finish_then_clause (guard_if_stmt
);
3753 finish_if_stmt (guard_if_stmt
);
3756 /* Now that we're done with DECL we don't need to pretend to be a
3757 member of its class any longer. */
3758 DECL_CONTEXT (current_function_decl
) = NULL_TREE
;
3759 DECL_STATIC_FUNCTION_P (current_function_decl
) = 0;
3762 /* Generate code to do the initialization or destruction of the decls in VARS,
3763 a TREE_LIST of VAR_DECL with static storage duration.
3764 Whether initialization or destruction is performed is specified by INITP. */
3767 do_static_initialization_or_destruction (tree vars
, bool initp
)
3769 tree node
, init_if_stmt
, cond
;
3771 /* Build the outer if-stmt to check for initialization or destruction. */
3772 init_if_stmt
= begin_if_stmt ();
3773 cond
= initp
? integer_one_node
: integer_zero_node
;
3774 cond
= cp_build_binary_op (input_location
,
3778 tf_warning_or_error
);
3779 finish_if_stmt_cond (cond
, init_if_stmt
);
3781 /* To make sure dynamic construction doesn't access globals from other
3782 compilation units where they might not be yet constructed, for
3783 -fsanitize=address insert __asan_before_dynamic_init call that
3784 prevents access to either all global variables that need construction
3785 in other compilation units, or at least those that haven't been
3786 initialized yet. Variables that need dynamic construction in
3787 the current compilation unit are kept accessible. */
3788 if (initp
&& (flag_sanitize
& SANITIZE_ADDRESS
))
3789 finish_expr_stmt (asan_dynamic_init_call (/*after_p=*/false));
3793 tree decl
= TREE_VALUE (node
);
3794 tree priority_if_stmt
;
3798 /* If we don't need a destructor, there's nothing to do. Avoid
3799 creating a possibly empty if-stmt. */
3800 if (!initp
&& TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl
)))
3802 node
= TREE_CHAIN (node
);
3806 /* Remember that we had an initialization or finalization at this
3808 priority
= DECL_EFFECTIVE_INIT_PRIORITY (decl
);
3809 pi
= get_priority_info (priority
);
3811 pi
->initializations_p
= 1;
3813 pi
->destructions_p
= 1;
3815 /* Conditionalize this initialization on being in the right priority
3816 and being initializing/finalizing appropriately. */
3817 priority_if_stmt
= begin_if_stmt ();
3818 cond
= cp_build_binary_op (input_location
,
3821 build_int_cst (NULL_TREE
, priority
),
3822 tf_warning_or_error
);
3823 finish_if_stmt_cond (cond
, priority_if_stmt
);
3825 /* Process initializers with same priority. */
3827 && DECL_EFFECTIVE_INIT_PRIORITY (TREE_VALUE (node
)) == priority
;
3828 node
= TREE_CHAIN (node
))
3829 /* Do one initialization or destruction. */
3830 one_static_initialization_or_destruction (TREE_VALUE (node
),
3831 TREE_PURPOSE (node
), initp
);
3833 /* Finish up the priority if-stmt body. */
3834 finish_then_clause (priority_if_stmt
);
3835 finish_if_stmt (priority_if_stmt
);
3839 /* Revert what __asan_before_dynamic_init did by calling
3840 __asan_after_dynamic_init. */
3841 if (initp
&& (flag_sanitize
& SANITIZE_ADDRESS
))
3842 finish_expr_stmt (asan_dynamic_init_call (/*after_p=*/true));
3844 /* Finish up the init/destruct if-stmt body. */
3845 finish_then_clause (init_if_stmt
);
3846 finish_if_stmt (init_if_stmt
);
3849 /* VARS is a list of variables with static storage duration which may
3850 need initialization and/or finalization. Remove those variables
3851 that don't really need to be initialized or finalized, and return
3852 the resulting list. The order in which the variables appear in
3853 VARS is in reverse order of the order in which they should actually
3854 be initialized. The list we return is in the unreversed order;
3855 i.e., the first variable should be initialized first. */
3858 prune_vars_needing_no_initialization (tree
*vars
)
3861 tree result
= NULL_TREE
;
3866 tree decl
= TREE_VALUE (t
);
3867 tree init
= TREE_PURPOSE (t
);
3869 /* Deal gracefully with error. */
3870 if (decl
== error_mark_node
)
3872 var
= &TREE_CHAIN (t
);
3876 /* The only things that can be initialized are variables. */
3877 gcc_assert (VAR_P (decl
));
3879 /* If this object is not defined, we don't need to do anything
3881 if (DECL_EXTERNAL (decl
))
3883 var
= &TREE_CHAIN (t
);
3887 /* Also, if the initializer already contains errors, we can bail
3889 if (init
&& TREE_CODE (init
) == TREE_LIST
3890 && value_member (error_mark_node
, init
))
3892 var
= &TREE_CHAIN (t
);
3896 /* This variable is going to need initialization and/or
3897 finalization, so we add it to the list. */
3898 *var
= TREE_CHAIN (t
);
3899 TREE_CHAIN (t
) = result
;
3906 /* Make sure we have told the back end about all the variables in
3910 write_out_vars (tree vars
)
3914 for (v
= vars
; v
; v
= TREE_CHAIN (v
))
3916 tree var
= TREE_VALUE (v
);
3917 if (!var_finalized_p (var
))
3919 import_export_decl (var
);
3920 rest_of_decl_compilation (var
, 1, 1);
3925 /* Generate a static constructor (if CONSTRUCTOR_P) or destructor
3926 (otherwise) that will initialize all global objects with static
3927 storage duration having the indicated PRIORITY. */
3930 generate_ctor_or_dtor_function (bool constructor_p
, int priority
,
3938 input_location
= *locus
;
3940 /* Was: locus->line++; */
3942 /* We use `I' to indicate initialization and `D' to indicate
3944 function_key
= constructor_p
? 'I' : 'D';
3946 /* We emit the function lazily, to avoid generating empty
3947 global constructors and destructors. */
3950 /* For Objective-C++, we may need to initialize metadata found in this module.
3951 This must be done _before_ any other static initializations. */
3952 if (c_dialect_objc () && (priority
== DEFAULT_INIT_PRIORITY
)
3953 && constructor_p
&& objc_static_init_needed_p ())
3955 body
= start_objects (function_key
, priority
);
3956 objc_generate_static_init_call (NULL_TREE
);
3959 /* Call the static storage duration function with appropriate
3961 FOR_EACH_VEC_SAFE_ELT (ssdf_decls
, i
, fndecl
)
3963 /* Calls to pure or const functions will expand to nothing. */
3964 if (! (flags_from_decl_or_type (fndecl
) & (ECF_CONST
| ECF_PURE
)))
3969 body
= start_objects (function_key
, priority
);
3971 call
= cp_build_function_call_nary (fndecl
, tf_warning_or_error
,
3972 build_int_cst (NULL_TREE
,
3974 build_int_cst (NULL_TREE
,
3977 finish_expr_stmt (call
);
3981 /* Close out the function. */
3983 finish_objects (function_key
, priority
, body
);
3986 /* Generate constructor and destructor functions for the priority
3990 generate_ctor_and_dtor_functions_for_priority (splay_tree_node n
, void * data
)
3992 location_t
*locus
= (location_t
*) data
;
3993 int priority
= (int) n
->key
;
3994 priority_info pi
= (priority_info
) n
->value
;
3996 /* Generate the functions themselves, but only if they are really
3998 if (pi
->initializations_p
)
3999 generate_ctor_or_dtor_function (/*constructor_p=*/true, priority
, locus
);
4000 if (pi
->destructions_p
)
4001 generate_ctor_or_dtor_function (/*constructor_p=*/false, priority
, locus
);
4003 /* Keep iterating. */
4007 /* Return C++ property of T, based on given operation OP. */
4010 cpp_check (tree t
, cpp_operation op
)
4014 case HAS_DEPENDENT_TEMPLATE_ARGS
:
4016 tree ti
= CLASSTYPE_TEMPLATE_INFO (t
);
4019 ++processing_template_decl
;
4020 const bool dep
= any_dependent_template_arguments_p (TI_ARGS (ti
));
4021 --processing_template_decl
;
4025 return DECL_PURE_VIRTUAL_P (t
);
4026 case IS_CONSTRUCTOR
:
4027 return DECL_CONSTRUCTOR_P (t
);
4029 return DECL_DESTRUCTOR_P (t
);
4030 case IS_COPY_CONSTRUCTOR
:
4031 return DECL_COPY_CONSTRUCTOR_P (t
);
4032 case IS_MOVE_CONSTRUCTOR
:
4033 return DECL_MOVE_CONSTRUCTOR_P (t
);
4035 return TREE_CODE (t
) == TEMPLATE_DECL
;
4037 return trivial_type_p (t
);
4043 /* Collect source file references recursively, starting from NAMESPC. */
4046 collect_source_refs (tree namespc
)
4053 /* Iterate over names in this name space. */
4054 for (t
= NAMESPACE_LEVEL (namespc
)->names
; t
; t
= TREE_CHAIN (t
))
4055 if (!DECL_IS_BUILTIN (t
) )
4056 collect_source_ref (DECL_SOURCE_FILE (t
));
4058 /* Dump siblings, if any */
4059 collect_source_refs (TREE_CHAIN (namespc
));
4061 /* Dump children, if any */
4062 collect_source_refs (NAMESPACE_LEVEL (namespc
)->namespaces
);
4065 /* Collect decls relevant to SOURCE_FILE from all namespaces recursively,
4066 starting from NAMESPC. */
4069 collect_ada_namespace (tree namespc
, const char *source_file
)
4074 /* Collect decls from this namespace */
4075 collect_ada_nodes (NAMESPACE_LEVEL (namespc
)->names
, source_file
);
4077 /* Collect siblings, if any */
4078 collect_ada_namespace (TREE_CHAIN (namespc
), source_file
);
4080 /* Collect children, if any */
4081 collect_ada_namespace (NAMESPACE_LEVEL (namespc
)->namespaces
, source_file
);
4084 /* Returns true iff there is a definition available for variable or
4088 decl_defined_p (tree decl
)
4090 if (TREE_CODE (decl
) == FUNCTION_DECL
)
4091 return (DECL_INITIAL (decl
) != NULL_TREE
);
4094 gcc_assert (VAR_P (decl
));
4095 return !DECL_EXTERNAL (decl
);
4099 /* Nonzero for a VAR_DECL whose value can be used in a constant expression.
4103 An integral constant-expression can only involve ... const
4104 variables of integral or enumeration types initialized with
4105 constant expressions ...
4107 C++0x also allows constexpr variables and temporaries initialized
4108 with constant expressions. We handle the former here, but the latter
4109 are just folded away in cxx_eval_constant_expression.
4111 The standard does not require that the expression be non-volatile.
4112 G++ implements the proposed correction in DR 457. */
4115 decl_constant_var_p (tree decl
)
4117 if (!decl_maybe_constant_var_p (decl
))
4120 /* We don't know if a template static data member is initialized with
4121 a constant expression until we instantiate its initializer. Even
4122 in the case of a constexpr variable, we can't treat it as a
4123 constant until its initializer is complete in case it's used in
4124 its own initializer. */
4125 maybe_instantiate_decl (decl
);
4126 return DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl
);
4129 /* Returns true if DECL could be a symbolic constant variable, depending on
4133 decl_maybe_constant_var_p (tree decl
)
4135 tree type
= TREE_TYPE (decl
);
4138 if (DECL_DECLARED_CONSTEXPR_P (decl
))
4140 if (DECL_HAS_VALUE_EXPR_P (decl
))
4141 /* A proxy isn't constant. */
4143 return (CP_TYPE_CONST_NON_VOLATILE_P (type
)
4144 && INTEGRAL_OR_ENUMERATION_TYPE_P (type
));
4147 /* Complain that DECL uses a type with no linkage. In C++98 mode this is
4148 called from grokfndecl and grokvardecl; in all modes it is called from
4149 cp_write_global_declarations. */
4152 no_linkage_error (tree decl
)
4154 if (cxx_dialect
>= cxx11
&& decl_defined_p (decl
))
4155 /* In C++11 it's ok if the decl is defined. */
4157 tree t
= no_linkage_check (TREE_TYPE (decl
), /*relaxed_p=*/false);
4159 /* The type that got us on no_linkage_decls must have gotten a name for
4160 linkage purposes. */;
4161 else if (CLASS_TYPE_P (t
) && TYPE_BEING_DEFINED (t
))
4162 /* The type might end up having a typedef name for linkage purposes. */
4163 vec_safe_push (no_linkage_decls
, decl
);
4164 else if (TYPE_UNNAMED_P (t
))
4167 if (cxx_dialect
>= cxx11
)
4168 d
= permerror (DECL_SOURCE_LOCATION (decl
), "%q#D, declared using "
4169 "unnamed type, is used but never defined", decl
);
4170 else if (DECL_EXTERN_C_P (decl
))
4171 /* Allow this; it's pretty common in C. */;
4172 else if (VAR_P (decl
))
4173 /* DRs 132, 319 and 389 seem to indicate types with
4174 no linkage can only be used to declare extern "C"
4175 entities. Since it's not always an error in the
4176 ISO C++ 90 Standard, we only issue a warning. */
4177 d
= warning_at (DECL_SOURCE_LOCATION (decl
), 0, "unnamed type "
4178 "with no linkage used to declare variable %q#D with "
4181 d
= permerror (DECL_SOURCE_LOCATION (decl
), "unnamed type with no "
4182 "linkage used to declare function %q#D with linkage",
4184 if (d
&& is_typedef_decl (TYPE_NAME (t
)))
4185 inform (DECL_SOURCE_LOCATION (TYPE_NAME (t
)), "%q#D does not refer "
4186 "to the unqualified type, so it is not used for linkage",
4189 else if (cxx_dialect
>= cxx11
)
4191 if (VAR_P (decl
) || !DECL_PURE_VIRTUAL_P (decl
))
4192 permerror (DECL_SOURCE_LOCATION (decl
),
4193 "%q#D, declared using local type "
4194 "%qT, is used but never defined", decl
, t
);
4196 else if (VAR_P (decl
))
4197 warning_at (DECL_SOURCE_LOCATION (decl
), 0, "type %qT with no linkage "
4198 "used to declare variable %q#D with linkage", t
, decl
);
4200 permerror (DECL_SOURCE_LOCATION (decl
), "type %qT with no linkage used "
4201 "to declare function %q#D with linkage", t
, decl
);
4204 /* Collect declarations from all namespaces relevant to SOURCE_FILE. */
4207 collect_all_refs (const char *source_file
)
4209 collect_ada_namespace (global_namespace
, source_file
);
4212 /* Clear DECL_EXTERNAL for NODE. */
4215 clear_decl_external (struct cgraph_node
*node
, void * /*data*/)
4217 DECL_EXTERNAL (node
->decl
) = 0;
4221 /* Build up the function to run dynamic initializers for thread_local
4222 variables in this translation unit and alias the init functions for the
4223 individual variables to it. */
4226 handle_tls_init (void)
4228 tree vars
= prune_vars_needing_no_initialization (&tls_aggregates
);
4229 if (vars
== NULL_TREE
)
4232 location_t loc
= DECL_SOURCE_LOCATION (TREE_VALUE (vars
));
4234 write_out_vars (vars
);
4236 tree guard
= build_decl (loc
, VAR_DECL
, get_identifier ("__tls_guard"),
4238 TREE_PUBLIC (guard
) = false;
4239 TREE_STATIC (guard
) = true;
4240 DECL_ARTIFICIAL (guard
) = true;
4241 DECL_IGNORED_P (guard
) = true;
4242 TREE_USED (guard
) = true;
4243 CP_DECL_THREAD_LOCAL_P (guard
) = true;
4244 set_decl_tls_model (guard
, decl_default_tls_model (guard
));
4245 pushdecl_top_level_and_finish (guard
, NULL_TREE
);
4247 tree fn
= get_local_tls_init_fn ();
4248 start_preparsed_function (fn
, NULL_TREE
, SF_PRE_PARSED
);
4249 tree body
= begin_function_body ();
4250 tree if_stmt
= begin_if_stmt ();
4251 tree cond
= cp_build_unary_op (TRUTH_NOT_EXPR
, guard
, false,
4252 tf_warning_or_error
);
4253 finish_if_stmt_cond (cond
, if_stmt
);
4254 finish_expr_stmt (cp_build_modify_expr (loc
, guard
, NOP_EXPR
,
4256 tf_warning_or_error
));
4257 for (; vars
; vars
= TREE_CHAIN (vars
))
4259 tree var
= TREE_VALUE (vars
);
4260 tree init
= TREE_PURPOSE (vars
);
4261 one_static_initialization_or_destruction (var
, init
, true);
4263 #ifdef ASM_OUTPUT_DEF
4264 /* Output init aliases even with -fno-extern-tls-init. */
4265 if (TREE_PUBLIC (var
))
4267 tree single_init_fn
= get_tls_init_fn (var
);
4268 if (single_init_fn
== NULL_TREE
)
4271 = cgraph_node::get_create (fn
)->create_same_body_alias
4272 (single_init_fn
, fn
);
4273 gcc_assert (alias
!= NULL
);
4278 finish_then_clause (if_stmt
);
4279 finish_if_stmt (if_stmt
);
4280 finish_function_body (body
);
4281 expand_or_defer_fn (finish_function (0));
4284 /* We're at the end of compilation, so generate any mangling aliases that
4285 we've been saving up, if DECL is going to be output and ID2 isn't
4286 already taken by another declaration. */
4289 generate_mangling_alias (tree decl
, tree id2
)
4291 /* If there's a declaration already using this mangled name,
4292 don't create a compatibility alias that conflicts. */
4293 if (IDENTIFIER_GLOBAL_VALUE (id2
))
4296 struct cgraph_node
*n
= NULL
;
4297 if (TREE_CODE (decl
) == FUNCTION_DECL
4298 && !(n
= cgraph_node::get (decl
)))
4299 /* Don't create an alias to an unreferenced function. */
4302 tree alias
= make_alias_for (decl
, id2
);
4303 SET_IDENTIFIER_GLOBAL_VALUE (id2
, alias
);
4304 DECL_IGNORED_P (alias
) = 1;
4305 TREE_PUBLIC (alias
) = TREE_PUBLIC (decl
);
4306 DECL_VISIBILITY (alias
) = DECL_VISIBILITY (decl
);
4307 if (vague_linkage_p (decl
))
4308 DECL_WEAK (alias
) = 1;
4309 if (TREE_CODE (decl
) == FUNCTION_DECL
)
4310 n
->create_same_body_alias (alias
, decl
);
4312 varpool_node::create_extra_name_alias (alias
, decl
);
4315 /* Note that we might want to emit an alias with the symbol ID2 for DECL at
4316 the end of translation, for compatibility across bugs in the mangling
4320 note_mangling_alias (tree decl ATTRIBUTE_UNUSED
, tree id2 ATTRIBUTE_UNUSED
)
4322 #ifdef ASM_OUTPUT_DEF
4323 if (!defer_mangling_aliases
)
4324 generate_mangling_alias (decl
, id2
);
4327 vec_safe_push (mangling_aliases
, decl
);
4328 vec_safe_push (mangling_aliases
, id2
);
4333 /* Emit all mangling aliases that were deferred up to this point. */
4336 generate_mangling_aliases ()
4338 while (!vec_safe_is_empty (mangling_aliases
))
4340 tree id2
= mangling_aliases
->pop();
4341 tree decl
= mangling_aliases
->pop();
4342 generate_mangling_alias (decl
, id2
);
4344 defer_mangling_aliases
= false;
4347 /* The entire file is now complete. If requested, dump everything
4354 FILE *stream
= dump_begin (TDI_tu
, &flags
);
4358 dump_node (global_namespace
, flags
& ~TDF_SLIM
, stream
);
4359 dump_end (TDI_tu
, stream
);
4363 static location_t locus_at_end_of_parsing
;
4365 /* Check the deallocation functions for CODE to see if we want to warn that
4366 only one was defined. */
4369 maybe_warn_sized_delete (enum tree_code code
)
4371 tree sized
= NULL_TREE
;
4372 tree unsized
= NULL_TREE
;
4374 for (tree ovl
= IDENTIFIER_GLOBAL_VALUE (ansi_opname (code
));
4375 ovl
; ovl
= OVL_NEXT (ovl
))
4377 tree fn
= OVL_CURRENT (ovl
);
4378 /* We're only interested in usual deallocation functions. */
4379 if (!usual_deallocation_fn_p (fn
))
4381 if (FUNCTION_ARG_CHAIN (fn
) == void_list_node
)
4386 if (DECL_INITIAL (unsized
) && !DECL_INITIAL (sized
))
4387 warning_at (DECL_SOURCE_LOCATION (unsized
), OPT_Wsized_deallocation
,
4388 "the program should also define %qD", sized
);
4389 else if (!DECL_INITIAL (unsized
) && DECL_INITIAL (sized
))
4390 warning_at (DECL_SOURCE_LOCATION (sized
), OPT_Wsized_deallocation
,
4391 "the program should also define %qD", unsized
);
4394 /* Check the global deallocation functions to see if we want to warn about
4395 defining unsized without sized (or vice versa). */
4398 maybe_warn_sized_delete ()
4400 if (!flag_sized_deallocation
|| !warn_sized_deallocation
)
4402 maybe_warn_sized_delete (DELETE_EXPR
);
4403 maybe_warn_sized_delete (VEC_DELETE_EXPR
);
4406 /* Earlier we left PTRMEM_CST in variable initializers alone so that we could
4407 look them up when evaluating non-type template parameters. Now we need to
4408 lower them to something the back end can understand. */
4414 FOR_EACH_VARIABLE (node
)
4416 tree d
= node
->decl
;
4417 if (tree init
= DECL_INITIAL (d
))
4418 DECL_INITIAL (d
) = cplus_expand_constant (init
);
4422 /* This routine is called at the end of compilation.
4423 Its job is to create all the code needed to initialize and
4424 destroy the global aggregates. We do the destruction
4425 first, since that way we only need to reverse the decls once. */
4428 c_parse_final_cleanups (void)
4433 unsigned ssdf_count
= 0;
4437 locus_at_end_of_parsing
= input_location
;
4440 /* Bad parse errors. Just forget about it. */
4441 if (! global_bindings_p () || current_class_type
4442 || !vec_safe_is_empty (decl_namespace_list
))
4445 /* This is the point to write out a PCH if we're doing that.
4446 In that case we do not want to do anything else. */
4449 /* Mangle all symbols at PCH creation time. */
4451 FOR_EACH_SYMBOL (node
)
4452 if (! is_a
<varpool_node
*> (node
)
4453 || ! DECL_HARD_REGISTER (node
->decl
))
4454 DECL_ASSEMBLER_NAME (node
->decl
);
4455 c_common_write_pch ();
4460 timevar_stop (TV_PHASE_PARSING
);
4461 timevar_start (TV_PHASE_DEFERRED
);
4463 symtab
->process_same_body_aliases ();
4465 /* Handle -fdump-ada-spec[-slim] */
4466 if (flag_dump_ada_spec
|| flag_dump_ada_spec_slim
)
4468 if (flag_dump_ada_spec_slim
)
4469 collect_source_ref (main_input_filename
);
4471 collect_source_refs (global_namespace
);
4473 dump_ada_specs (collect_all_refs
, cpp_check
);
4476 /* FIXME - huh? was input_line -= 1;*/
4478 /* We now have to write out all the stuff we put off writing out.
4481 o Template specializations that we have not yet instantiated,
4482 but which are needed.
4483 o Initialization and destruction for non-local objects with
4484 static storage duration. (Local objects with static storage
4485 duration are initialized when their scope is first entered,
4486 and are cleaned up via atexit.)
4487 o Virtual function tables.
4489 All of these may cause others to be needed. For example,
4490 instantiating one function may cause another to be needed, and
4491 generating the initializer for an object may cause templates to be
4492 instantiated, etc., etc. */
4494 emit_support_tinfos ();
4503 /* If there are templates that we've put off instantiating, do
4505 instantiate_pending_templates (retries
);
4508 /* Write out virtual tables as required. Note that writing out
4509 the virtual table for a template class may cause the
4510 instantiation of members of that class. If we write out
4511 vtables then we remove the class from our list so we don't
4512 have to look at it again. */
4514 while (keyed_classes
!= NULL_TREE
4515 && maybe_emit_vtables (TREE_VALUE (keyed_classes
)))
4518 keyed_classes
= TREE_CHAIN (keyed_classes
);
4524 tree next
= TREE_CHAIN (t
);
4528 if (maybe_emit_vtables (TREE_VALUE (next
)))
4531 TREE_CHAIN (t
) = TREE_CHAIN (next
);
4536 next
= TREE_CHAIN (t
);
4540 /* Write out needed type info variables. We have to be careful
4541 looping through unemitted decls, because emit_tinfo_decl may
4542 cause other variables to be needed. New elements will be
4543 appended, and we remove from the vector those that actually
4545 for (i
= unemitted_tinfo_decls
->length ();
4546 unemitted_tinfo_decls
->iterate (--i
, &t
);)
4547 if (emit_tinfo_decl (t
))
4550 unemitted_tinfo_decls
->unordered_remove (i
);
4553 /* The list of objects with static storage duration is built up
4554 in reverse order. We clear STATIC_AGGREGATES so that any new
4555 aggregates added during the initialization of these will be
4556 initialized in the correct order when we next come around the
4558 vars
= prune_vars_needing_no_initialization (&static_aggregates
);
4562 /* We need to start a new initialization function each time
4563 through the loop. That's because we need to know which
4564 vtables have been referenced, and TREE_SYMBOL_REFERENCED
4565 isn't computed until a function is finished, and written
4566 out. That's a deficiency in the back end. When this is
4567 fixed, these initialization functions could all become
4568 inline, with resulting performance improvements. */
4571 /* Set the line and file, so that it is obviously not from
4573 input_location
= locus_at_end_of_parsing
;
4574 ssdf_body
= start_static_storage_duration_function (ssdf_count
);
4576 /* Make sure the back end knows about all the variables. */
4577 write_out_vars (vars
);
4579 /* First generate code to do all the initializations. */
4581 do_static_initialization_or_destruction (vars
, /*initp=*/true);
4583 /* Then, generate code to do all the destructions. Do these
4584 in reverse order so that the most recently constructed
4585 variable is the first destroyed. If we're using
4586 __cxa_atexit, then we don't need to do this; functions
4587 were registered at initialization time to destroy the
4589 if (!flag_use_cxa_atexit
&& vars
)
4591 vars
= nreverse (vars
);
4592 do_static_initialization_or_destruction (vars
, /*initp=*/false);
4597 /* Finish up the static storage duration function for this
4599 input_location
= locus_at_end_of_parsing
;
4600 finish_static_storage_duration_function (ssdf_body
);
4602 /* All those initializations and finalizations might cause
4603 us to need more inline functions, more template
4604 instantiations, etc. */
4607 /* ??? was: locus_at_end_of_parsing.line++; */
4610 /* Now do the same for thread_local variables. */
4613 /* Go through the set of inline functions whose bodies have not
4614 been emitted yet. If out-of-line copies of these functions
4615 are required, emit them. */
4616 FOR_EACH_VEC_SAFE_ELT (deferred_fns
, i
, decl
)
4618 /* Does it need synthesizing? */
4619 if (DECL_DEFAULTED_FN (decl
) && ! DECL_INITIAL (decl
)
4620 && (! DECL_REALLY_EXTERN (decl
) || possibly_inlined_p (decl
)))
4622 /* Even though we're already at the top-level, we push
4623 there again. That way, when we pop back a few lines
4624 hence, all of our state is restored. Otherwise,
4625 finish_function doesn't clean things up, and we end
4626 up with CURRENT_FUNCTION_DECL set. */
4627 push_to_top_level ();
4628 /* The decl's location will mark where it was first
4629 needed. Save that so synthesize method can indicate
4630 where it was needed from, in case of error */
4631 input_location
= DECL_SOURCE_LOCATION (decl
);
4632 synthesize_method (decl
);
4633 pop_from_top_level ();
4637 if (!DECL_INITIAL (decl
) && decl_tls_wrapper_p (decl
))
4638 generate_tls_wrapper (decl
);
4640 if (!DECL_SAVED_TREE (decl
))
4643 /* We lie to the back end, pretending that some functions
4644 are not defined when they really are. This keeps these
4645 functions from being put out unnecessarily. But, we must
4646 stop lying when the functions are referenced, or if they
4647 are not comdat since they need to be put out now. If
4648 DECL_INTERFACE_KNOWN, then we have already set
4649 DECL_EXTERNAL appropriately, so there's no need to check
4650 again, and we do not want to clear DECL_EXTERNAL if a
4651 previous call to import_export_decl set it.
4653 This is done in a separate for cycle, because if some
4654 deferred function is contained in another deferred
4655 function later in deferred_fns varray,
4656 rest_of_compilation would skip this function and we
4657 really cannot expand the same function twice. */
4658 import_export_decl (decl
);
4659 if (DECL_NOT_REALLY_EXTERN (decl
)
4660 && DECL_INITIAL (decl
)
4661 && decl_needed_p (decl
))
4663 struct cgraph_node
*node
, *next
;
4665 node
= cgraph_node::get (decl
);
4666 if (node
->cpp_implicit_alias
)
4667 node
= node
->get_alias_target ();
4669 node
->call_for_symbol_thunks_and_aliases (clear_decl_external
,
4671 /* If we mark !DECL_EXTERNAL one of the symbols in some comdat
4672 group, we need to mark all symbols in the same comdat group
4674 if (node
->same_comdat_group
)
4675 for (next
= dyn_cast
<cgraph_node
*> (node
->same_comdat_group
);
4677 next
= dyn_cast
<cgraph_node
*> (next
->same_comdat_group
))
4678 next
->call_for_symbol_thunks_and_aliases (clear_decl_external
,
4682 /* If we're going to need to write this function out, and
4683 there's already a body for it, create RTL for it now.
4684 (There might be no body if this is a method we haven't
4685 gotten around to synthesizing yet.) */
4686 if (!DECL_EXTERNAL (decl
)
4687 && decl_needed_p (decl
)
4688 && !TREE_ASM_WRITTEN (decl
)
4689 && !cgraph_node::get (decl
)->definition
)
4691 /* We will output the function; no longer consider it in this
4693 DECL_DEFER_OUTPUT (decl
) = 0;
4694 /* Generate RTL for this function now that we know we
4696 expand_or_defer_fn (decl
);
4697 /* If we're compiling -fsyntax-only pretend that this
4698 function has been written out so that we don't try to
4700 if (flag_syntax_only
)
4701 TREE_ASM_WRITTEN (decl
) = 1;
4706 if (walk_namespaces (wrapup_globals_for_namespace
, /*data=*/0))
4709 /* Static data members are just like namespace-scope globals. */
4710 FOR_EACH_VEC_SAFE_ELT (pending_statics
, i
, decl
)
4712 if (var_finalized_p (decl
) || DECL_REALLY_EXTERN (decl
)
4713 /* Don't write it out if we haven't seen a definition. */
4714 || DECL_IN_AGGR_P (decl
))
4716 import_export_decl (decl
);
4717 /* If this static data member is needed, provide it to the
4719 if (DECL_NOT_REALLY_EXTERN (decl
) && decl_needed_p (decl
))
4720 DECL_EXTERNAL (decl
) = 0;
4722 if (vec_safe_length (pending_statics
) != 0
4723 && wrapup_global_declarations (pending_statics
->address (),
4724 pending_statics
->length ()))
4733 generate_mangling_aliases ();
4735 /* All used inline functions must have a definition at this point. */
4736 FOR_EACH_VEC_SAFE_ELT (deferred_fns
, i
, decl
)
4738 if (/* Check online inline functions that were actually used. */
4739 DECL_ODR_USED (decl
) && DECL_DECLARED_INLINE_P (decl
)
4740 /* If the definition actually was available here, then the
4741 fact that the function was not defined merely represents
4742 that for some reason (use of a template repository,
4743 #pragma interface, etc.) we decided not to emit the
4745 && !DECL_INITIAL (decl
)
4746 /* Don't complain if the template was defined. */
4747 && !(DECL_TEMPLATE_INSTANTIATION (decl
)
4748 && DECL_INITIAL (DECL_TEMPLATE_RESULT
4749 (template_for_substitution (decl
)))))
4751 warning_at (DECL_SOURCE_LOCATION (decl
), 0,
4752 "inline function %qD used but never defined", decl
);
4753 /* Avoid a duplicate warning from check_global_declaration. */
4754 TREE_NO_WARNING (decl
) = 1;
4758 /* So must decls that use a type with no linkage. */
4759 FOR_EACH_VEC_SAFE_ELT (no_linkage_decls
, i
, decl
)
4760 no_linkage_error (decl
);
4762 maybe_warn_sized_delete ();
4764 /* Then, do the Objective-C stuff. This is where all the
4765 Objective-C module stuff gets generated (symtab,
4766 class/protocol/selector lists etc). This must be done after C++
4767 templates, destructors etc. so that selectors used in C++
4768 templates are properly allocated. */
4769 if (c_dialect_objc ())
4770 objc_write_global_declarations ();
4772 /* We give C linkage to static constructors and destructors. */
4773 push_lang_context (lang_name_c
);
4775 /* Generate initialization and destruction functions for all
4776 priorities for which they are required. */
4777 if (priority_info_map
)
4778 splay_tree_foreach (priority_info_map
,
4779 generate_ctor_and_dtor_functions_for_priority
,
4780 /*data=*/&locus_at_end_of_parsing
);
4781 else if (c_dialect_objc () && objc_static_init_needed_p ())
4782 /* If this is obj-c++ and we need a static init, call
4783 generate_ctor_or_dtor_function. */
4784 generate_ctor_or_dtor_function (/*constructor_p=*/true,
4785 DEFAULT_INIT_PRIORITY
,
4786 &locus_at_end_of_parsing
);
4788 /* We're done with the splay-tree now. */
4789 if (priority_info_map
)
4790 splay_tree_delete (priority_info_map
);
4792 /* Generate any missing aliases. */
4793 maybe_apply_pending_pragma_weaks ();
4795 /* We're done with static constructors, so we can go back to "C++"
4797 pop_lang_context ();
4799 if (flag_vtable_verify
)
4801 vtv_recover_class_info ();
4802 vtv_compute_class_hierarchy_transitive_closure ();
4803 vtv_build_vtable_verify_fndecl ();
4806 perform_deferred_noexcept_checks ();
4812 /* The entire file is now complete. If requested, dump everything
4816 if (flag_detailed_statistics
)
4818 dump_tree_statistics ();
4819 dump_time_statistics ();
4822 timevar_stop (TV_PHASE_DEFERRED
);
4823 timevar_start (TV_PHASE_PARSING
);
4825 /* Indicate that we're done with front end processing. */
4829 /* Perform any post compilation-proper cleanups for the C++ front-end.
4830 This should really go away. No front-end should need to do
4831 anything past the compilation process. */
4834 cxx_post_compilation_parsing_cleanups (void)
4836 timevar_start (TV_PHASE_LATE_PARSING_CLEANUPS
);
4838 if (flag_vtable_verify
)
4840 /* Generate the special constructor initialization function that
4841 calls __VLTRegisterPairs, and give it a very high
4842 initialization priority. This must be done after
4843 finalize_compilation_unit so that we have accurate
4844 information about which vtable will actually be emitted. */
4845 vtv_generate_init_routine ();
4848 input_location
= locus_at_end_of_parsing
;
4851 validate_conversion_obstack ();
4853 timevar_stop (TV_PHASE_LATE_PARSING_CLEANUPS
);
4856 /* FN is an OFFSET_REF, DOTSTAR_EXPR or MEMBER_REF indicating the
4857 function to call in parse-tree form; it has not yet been
4858 semantically analyzed. ARGS are the arguments to the function.
4859 They have already been semantically analyzed. This may change
4863 build_offset_ref_call_from_tree (tree fn
, vec
<tree
, va_gc
> **args
,
4864 tsubst_flags_t complain
)
4867 vec
<tree
, va_gc
> *orig_args
= NULL
;
4872 object
= TREE_OPERAND (fn
, 0);
4874 if (processing_template_decl
)
4876 gcc_assert (TREE_CODE (fn
) == DOTSTAR_EXPR
4877 || TREE_CODE (fn
) == MEMBER_REF
);
4878 if (type_dependent_expression_p (fn
)
4879 || any_type_dependent_arguments_p (*args
))
4880 return build_nt_call_vec (fn
, *args
);
4882 orig_args
= make_tree_vector_copy (*args
);
4884 /* Transform the arguments and add the implicit "this"
4885 parameter. That must be done before the FN is transformed
4886 because we depend on the form of FN. */
4887 make_args_non_dependent (*args
);
4888 object
= build_non_dependent_expr (object
);
4889 if (TREE_CODE (TREE_TYPE (fn
)) == METHOD_TYPE
)
4891 if (TREE_CODE (fn
) == DOTSTAR_EXPR
)
4892 object
= cp_build_addr_expr (object
, complain
);
4893 vec_safe_insert (*args
, 0, object
);
4895 /* Now that the arguments are done, transform FN. */
4896 fn
= build_non_dependent_expr (fn
);
4899 /* A qualified name corresponding to a bound pointer-to-member is
4900 represented as an OFFSET_REF:
4902 struct B { void g(); };
4904 void B::g() { (this->*p)(); } */
4905 if (TREE_CODE (fn
) == OFFSET_REF
)
4907 tree object_addr
= cp_build_addr_expr (object
, complain
);
4908 fn
= TREE_OPERAND (fn
, 1);
4909 fn
= get_member_function_from_ptrfunc (&object_addr
, fn
,
4911 vec_safe_insert (*args
, 0, object_addr
);
4914 if (CLASS_TYPE_P (TREE_TYPE (fn
)))
4915 expr
= build_op_call (fn
, args
, complain
);
4917 expr
= cp_build_function_call_vec (fn
, args
, complain
);
4918 if (processing_template_decl
&& expr
!= error_mark_node
)
4919 expr
= build_min_non_dep_call_vec (expr
, orig_fn
, orig_args
);
4921 if (orig_args
!= NULL
)
4922 release_tree_vector (orig_args
);
4929 check_default_args (tree x
)
4931 tree arg
= TYPE_ARG_TYPES (TREE_TYPE (x
));
4932 bool saw_def
= false;
4933 int i
= 0 - (TREE_CODE (TREE_TYPE (x
)) == METHOD_TYPE
);
4934 for (; arg
&& arg
!= void_list_node
; arg
= TREE_CHAIN (arg
), ++i
)
4936 if (TREE_PURPOSE (arg
))
4938 else if (saw_def
&& !PACK_EXPANSION_P (TREE_VALUE (arg
)))
4940 error ("default argument missing for parameter %P of %q+#D", i
, x
);
4941 TREE_PURPOSE (arg
) = error_mark_node
;
4946 /* Return true if function DECL can be inlined. This is used to force
4947 instantiation of methods that might be interesting for inlining. */
4949 possibly_inlined_p (tree decl
)
4951 gcc_assert (TREE_CODE (decl
) == FUNCTION_DECL
);
4952 if (DECL_UNINLINABLE (decl
))
4955 return DECL_DECLARED_INLINE_P (decl
);
4956 /* When optimizing, we might inline everything when flatten
4957 attribute or heuristics inlining for size or autoinlining
4962 /* Normally, we can wait until instantiation-time to synthesize DECL.
4963 However, if DECL is a static data member initialized with a constant
4964 or a constexpr function, we need it right now because a reference to
4965 such a data member or a call to such function is not value-dependent.
4966 For a function that uses auto in the return type, we need to instantiate
4967 it to find out its type. For OpenMP user defined reductions, we need
4968 them instantiated for reduction clauses which inline them by hand
4972 maybe_instantiate_decl (tree decl
)
4974 if (DECL_LANG_SPECIFIC (decl
)
4975 && DECL_TEMPLATE_INFO (decl
)
4976 && (decl_maybe_constant_var_p (decl
)
4977 || (TREE_CODE (decl
) == FUNCTION_DECL
4978 && DECL_OMP_DECLARE_REDUCTION_P (decl
))
4979 || undeduced_auto_decl (decl
))
4980 && !DECL_DECLARED_CONCEPT_P (decl
)
4981 && !uses_template_parms (DECL_TI_ARGS (decl
)))
4983 /* Instantiating a function will result in garbage collection. We
4984 must treat this situation as if we were within the body of a
4985 function so as to avoid collecting live data only referenced from
4986 the stack (such as overload resolution candidates). */
4988 instantiate_decl (decl
, /*defer_ok=*/false,
4989 /*expl_inst_class_mem_p=*/false);
4994 /* Mark DECL (either a _DECL or a BASELINK) as "used" in the program.
4995 If DECL is a specialization or implicitly declared class member,
4996 generate the actual definition. Return false if something goes
4997 wrong, true otherwise. */
5000 mark_used (tree decl
, tsubst_flags_t complain
)
5002 /* If DECL is a BASELINK for a single function, then treat it just
5003 like the DECL for the function. Otherwise, if the BASELINK is
5004 for an overloaded function, we don't know which function was
5005 actually used until after overload resolution. */
5006 if (BASELINK_P (decl
))
5008 decl
= BASELINK_FUNCTIONS (decl
);
5009 if (really_overloaded_fn (decl
))
5011 decl
= OVL_CURRENT (decl
);
5014 /* Set TREE_USED for the benefit of -Wunused. */
5015 TREE_USED (decl
) = 1;
5017 if (TREE_CODE (decl
) == TEMPLATE_DECL
)
5020 if (DECL_CLONED_FUNCTION_P (decl
))
5021 TREE_USED (DECL_CLONED_FUNCTION (decl
)) = 1;
5023 /* Mark enumeration types as used. */
5024 if (TREE_CODE (decl
) == CONST_DECL
)
5025 used_types_insert (DECL_CONTEXT (decl
));
5027 if (TREE_CODE (decl
) == FUNCTION_DECL
)
5028 maybe_instantiate_noexcept (decl
);
5030 if (TREE_CODE (decl
) == FUNCTION_DECL
5031 && DECL_DELETED_FN (decl
))
5033 if (DECL_ARTIFICIAL (decl
))
5035 if (DECL_OVERLOADED_OPERATOR_P (decl
) == TYPE_EXPR
5036 && LAMBDA_TYPE_P (DECL_CONTEXT (decl
)))
5038 /* We mark a lambda conversion op as deleted if we can't
5039 generate it properly; see maybe_add_lambda_conv_op. */
5040 sorry ("converting lambda which uses %<...%> to "
5041 "function pointer");
5045 if (complain
& tf_error
)
5047 error ("use of deleted function %qD", decl
);
5048 if (!maybe_explain_implicit_delete (decl
))
5049 inform (DECL_SOURCE_LOCATION (decl
), "declared here");
5054 if (TREE_DEPRECATED (decl
) && (complain
& tf_warning
)
5055 && deprecated_state
!= DEPRECATED_SUPPRESS
)
5056 warn_deprecated_use (decl
, NULL_TREE
);
5058 /* We can only check DECL_ODR_USED on variables or functions with
5059 DECL_LANG_SPECIFIC set, and these are also the only decls that we
5060 might need special handling for. */
5061 if (!VAR_OR_FUNCTION_DECL_P (decl
)
5062 || DECL_LANG_SPECIFIC (decl
) == NULL
5063 || DECL_THUNK_P (decl
))
5065 if (!processing_template_decl
&& type_uses_auto (TREE_TYPE (decl
)))
5067 if (complain
& tf_error
)
5068 error ("use of %qD before deduction of %<auto%>", decl
);
5074 /* We only want to do this processing once. We don't need to keep trying
5075 to instantiate inline templates, because unit-at-a-time will make sure
5076 we get them compiled before functions that want to inline them. */
5077 if (DECL_ODR_USED (decl
))
5080 /* Normally, we can wait until instantiation-time to synthesize DECL.
5081 However, if DECL is a static data member initialized with a constant
5082 or a constexpr function, we need it right now because a reference to
5083 such a data member or a call to such function is not value-dependent.
5084 For a function that uses auto in the return type, we need to instantiate
5085 it to find out its type. For OpenMP user defined reductions, we need
5086 them instantiated for reduction clauses which inline them by hand
5088 maybe_instantiate_decl (decl
);
5090 if (processing_template_decl
|| in_template_function ())
5093 /* Check this too in case we're within instantiate_non_dependent_expr. */
5094 if (DECL_TEMPLATE_INFO (decl
)
5095 && uses_template_parms (DECL_TI_ARGS (decl
)))
5098 if (undeduced_auto_decl (decl
))
5100 if (complain
& tf_error
)
5101 error ("use of %qD before deduction of %<auto%>", decl
);
5105 /* If we don't need a value, then we don't need to synthesize DECL. */
5106 if (cp_unevaluated_operand
!= 0)
5109 DECL_ODR_USED (decl
) = 1;
5110 if (DECL_CLONED_FUNCTION_P (decl
))
5111 DECL_ODR_USED (DECL_CLONED_FUNCTION (decl
)) = 1;
5113 /* DR 757: A type without linkage shall not be used as the type of a
5114 variable or function with linkage, unless
5115 o the variable or function has extern "C" linkage (7.5 [dcl.link]), or
5116 o the variable or function is not used (3.2 [basic.def.odr]) or is
5117 defined in the same translation unit. */
5118 if (cxx_dialect
> cxx98
5119 && decl_linkage (decl
) != lk_none
5120 && !DECL_EXTERN_C_P (decl
)
5121 && !DECL_ARTIFICIAL (decl
)
5122 && !decl_defined_p (decl
)
5123 && no_linkage_check (TREE_TYPE (decl
), /*relaxed_p=*/false))
5125 if (is_local_extern (decl
))
5126 /* There's no way to define a local extern, and adding it to
5127 the vector interferes with GC, so give an error now. */
5128 no_linkage_error (decl
);
5130 vec_safe_push (no_linkage_decls
, decl
);
5133 if (TREE_CODE (decl
) == FUNCTION_DECL
&& DECL_DECLARED_INLINE_P (decl
)
5134 && !DECL_INITIAL (decl
) && !DECL_ARTIFICIAL (decl
))
5135 /* Remember it, so we can check it was defined. */
5136 note_vague_linkage_fn (decl
);
5138 /* Is it a synthesized method that needs to be synthesized? */
5139 if (TREE_CODE (decl
) == FUNCTION_DECL
5140 && DECL_NONSTATIC_MEMBER_FUNCTION_P (decl
)
5141 && DECL_DEFAULTED_FN (decl
)
5142 /* A function defaulted outside the class is synthesized either by
5143 cp_finish_decl or instantiate_decl. */
5144 && !DECL_DEFAULTED_OUTSIDE_CLASS_P (decl
)
5145 && ! DECL_INITIAL (decl
))
5147 /* Defer virtual destructors so that thunks get the right
5149 if (DECL_VIRTUAL_P (decl
) && !at_eof
)
5151 note_vague_linkage_fn (decl
);
5155 /* Remember the current location for a function we will end up
5156 synthesizing. Then we can inform the user where it was
5157 required in the case of error. */
5158 DECL_SOURCE_LOCATION (decl
) = input_location
;
5160 /* Synthesizing an implicitly defined member function will result in
5161 garbage collection. We must treat this situation as if we were
5162 within the body of a function so as to avoid collecting live data
5163 on the stack (such as overload resolution candidates).
5165 We could just let cp_write_global_declarations handle synthesizing
5166 this function by adding it to deferred_fns, but doing
5167 it at the use site produces better error messages. */
5169 synthesize_method (decl
);
5171 /* If this is a synthesized method we don't need to
5172 do the instantiation test below. */
5174 else if (VAR_OR_FUNCTION_DECL_P (decl
)
5175 && DECL_TEMPLATE_INFO (decl
)
5176 && !DECL_DECLARED_CONCEPT_P (decl
)
5177 && (!DECL_EXPLICIT_INSTANTIATION (decl
)
5178 || always_instantiate_p (decl
)))
5179 /* If this is a function or variable that is an instance of some
5180 template, we now know that we will need to actually do the
5181 instantiation. We check that DECL is not an explicit
5182 instantiation because that is not checked in instantiate_decl.
5184 We put off instantiating functions in order to improve compile
5185 times. Maintaining a stack of active functions is expensive,
5186 and the inliner knows to instantiate any functions it might
5187 need. Therefore, we always try to defer instantiation. */
5190 instantiate_decl (decl
, /*defer_ok=*/true,
5191 /*expl_inst_class_mem_p=*/false);
5199 mark_used (tree decl
)
5201 return mark_used (decl
, tf_warning_or_error
);
5205 vtv_start_verification_constructor_init_function (void)
5207 return start_objects ('I', MAX_RESERVED_INIT_PRIORITY
- 1);
5211 vtv_finish_verification_constructor_init_function (tree function_body
)
5215 finish_compound_stmt (function_body
);
5216 fn
= finish_function (0);
5217 DECL_STATIC_CONSTRUCTOR (fn
) = 1;
5218 decl_init_priority_insert (fn
, MAX_RESERVED_INIT_PRIORITY
- 1);
5223 #include "gt-cp-decl2.h"