1 /* Process declarations and variables for C++ compiler.
2 Copyright (C) 1988-2017 Free Software Foundation, Inc.
3 Hacked by Michael Tiemann (tiemann@cygnus.com)
5 This file is part of GCC.
7 GCC is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3, or (at your option)
12 GCC is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with GCC; see the file COPYING3. If not see
19 <http://www.gnu.org/licenses/>. */
22 /* Process declarations and symbol lookup for C++ front end.
23 Also constructs types; the standard scalar types at initialization,
24 and structure, union, array and enum types when they are declared. */
26 /* ??? not all decl nodes are given the most useful possible
27 line numbers. For example, the CONST_DECLs for enum values. */
31 #include "coretypes.h"
35 #include "c-family/c-common.h"
37 #include "stringpool.h"
41 #include "stor-layout.h"
45 #include "c-family/c-objc.h"
46 #include "c-family/c-pragma.h"
49 #include "c-family/c-ada-spec.h"
52 /* Id for dumping the raw trees. */
55 extern cpp_reader
*parse_in
;
57 /* This structure contains information about the initializations
58 and/or destructions required for a particular priority level. */
59 typedef struct priority_info_s
{
60 /* Nonzero if there have been any initializations at this priority
61 throughout the translation unit. */
62 int initializations_p
;
63 /* Nonzero if there have been any destructions at this priority
64 throughout the translation unit. */
68 static void mark_vtable_entries (tree
);
69 static bool maybe_emit_vtables (tree
);
70 static tree
start_objects (int, int);
71 static void finish_objects (int, int, tree
);
72 static tree
start_static_storage_duration_function (unsigned);
73 static void finish_static_storage_duration_function (tree
);
74 static priority_info
get_priority_info (int);
75 static void do_static_initialization_or_destruction (tree
, bool);
76 static void one_static_initialization_or_destruction (tree
, tree
, bool);
77 static void generate_ctor_or_dtor_function (bool, int, location_t
*);
78 static int generate_ctor_and_dtor_functions_for_priority (splay_tree_node
,
80 static tree
prune_vars_needing_no_initialization (tree
*);
81 static void write_out_vars (tree
);
82 static void import_export_class (tree
);
83 static tree
get_guard_bits (tree
);
84 static void determine_visibility_from_class (tree
, tree
);
85 static bool determine_hidden_inline (tree
);
86 static void maybe_instantiate_decl (tree
);
88 /* A list of static class variables. This is needed, because a
89 static class variable can be declared inside the class without
90 an initializer, and then initialized, statically, outside the class. */
91 static GTY(()) vec
<tree
, va_gc
> *pending_statics
;
93 /* A list of functions which were declared inline, but which we
94 may need to emit outline anyway. */
95 static GTY(()) vec
<tree
, va_gc
> *deferred_fns
;
97 /* A list of decls that use types with no linkage, which we need to make
99 static GTY(()) vec
<tree
, va_gc
> *no_linkage_decls
;
101 /* A vector of alternating decls and identifiers, where the latter
102 is to be an alias for the former if the former is defined. */
103 static GTY(()) vec
<tree
, va_gc
> *mangling_aliases
;
105 /* Nonzero if we're done parsing and into end-of-file activities. */
109 /* True if note_mangling_alias should enqueue mangling aliases for
110 later generation, rather than emitting them right away. */
112 bool defer_mangling_aliases
= true;
115 /* Return a member function type (a METHOD_TYPE), given FNTYPE (a
116 FUNCTION_TYPE), CTYPE (class type), and QUALS (the cv-qualifiers
117 that apply to the function). */
120 build_memfn_type (tree fntype
, tree ctype
, cp_cv_quals quals
,
121 cp_ref_qualifier rqual
)
126 bool late_return_type_p
;
128 if (fntype
== error_mark_node
|| ctype
== error_mark_node
)
129 return error_mark_node
;
131 gcc_assert (TREE_CODE (fntype
) == FUNCTION_TYPE
132 || TREE_CODE (fntype
) == METHOD_TYPE
);
134 type_quals
= quals
& ~TYPE_QUAL_RESTRICT
;
135 ctype
= cp_build_qualified_type (ctype
, type_quals
);
136 raises
= TYPE_RAISES_EXCEPTIONS (fntype
);
137 attrs
= TYPE_ATTRIBUTES (fntype
);
138 late_return_type_p
= TYPE_HAS_LATE_RETURN_TYPE (fntype
);
139 fntype
= build_method_type_directly (ctype
, TREE_TYPE (fntype
),
140 (TREE_CODE (fntype
) == METHOD_TYPE
141 ? TREE_CHAIN (TYPE_ARG_TYPES (fntype
))
142 : TYPE_ARG_TYPES (fntype
)));
144 fntype
= cp_build_type_attribute_variant (fntype
, attrs
);
146 fntype
= build_ref_qualified_type (fntype
, rqual
);
148 fntype
= build_exception_variant (fntype
, raises
);
149 if (late_return_type_p
)
150 TYPE_HAS_LATE_RETURN_TYPE (fntype
) = 1;
155 /* Return a variant of FNTYPE, a FUNCTION_TYPE or METHOD_TYPE, with its
156 return type changed to NEW_RET. */
159 change_return_type (tree new_ret
, tree fntype
)
162 tree args
= TYPE_ARG_TYPES (fntype
);
163 tree raises
= TYPE_RAISES_EXCEPTIONS (fntype
);
164 tree attrs
= TYPE_ATTRIBUTES (fntype
);
165 bool late_return_type_p
= TYPE_HAS_LATE_RETURN_TYPE (fntype
);
167 if (new_ret
== error_mark_node
)
170 if (same_type_p (new_ret
, TREE_TYPE (fntype
)))
173 if (TREE_CODE (fntype
) == FUNCTION_TYPE
)
175 newtype
= build_function_type (new_ret
, args
);
176 newtype
= apply_memfn_quals (newtype
,
177 type_memfn_quals (fntype
),
178 type_memfn_rqual (fntype
));
181 newtype
= build_method_type_directly
182 (class_of_this_parm (fntype
), new_ret
, TREE_CHAIN (args
));
183 if (FUNCTION_REF_QUALIFIED (fntype
))
184 newtype
= build_ref_qualified_type (newtype
, type_memfn_rqual (fntype
));
186 newtype
= build_exception_variant (newtype
, raises
);
188 newtype
= cp_build_type_attribute_variant (newtype
, attrs
);
189 if (late_return_type_p
)
190 TYPE_HAS_LATE_RETURN_TYPE (newtype
) = 1;
195 /* Build a PARM_DECL with NAME and TYPE, and set DECL_ARG_TYPE
199 cp_build_parm_decl (tree name
, tree type
)
201 tree parm
= build_decl (input_location
,
202 PARM_DECL
, name
, type
);
203 /* DECL_ARG_TYPE is only used by the back end and the back end never
205 if (!processing_template_decl
)
206 DECL_ARG_TYPE (parm
) = type_passed_as (type
);
211 /* Returns a PARM_DECL for a parameter of the indicated TYPE, with the
215 build_artificial_parm (tree name
, tree type
)
217 tree parm
= cp_build_parm_decl (name
, type
);
218 DECL_ARTIFICIAL (parm
) = 1;
219 /* All our artificial parms are implicitly `const'; they cannot be
221 TREE_READONLY (parm
) = 1;
225 /* Constructors for types with virtual baseclasses need an "in-charge" flag
226 saying whether this constructor is responsible for initialization of
227 virtual baseclasses or not. All destructors also need this "in-charge"
228 flag, which additionally determines whether or not the destructor should
229 free the memory for the object.
231 This function adds the "in-charge" flag to member function FN if
232 appropriate. It is called from grokclassfn and tsubst.
233 FN must be either a constructor or destructor.
235 The in-charge flag follows the 'this' parameter, and is followed by the
236 VTT parm (if any), then the user-written parms. */
239 maybe_retrofit_in_chrg (tree fn
)
241 tree basetype
, arg_types
, parms
, parm
, fntype
;
243 /* If we've already add the in-charge parameter don't do it again. */
244 if (DECL_HAS_IN_CHARGE_PARM_P (fn
))
247 /* When processing templates we can't know, in general, whether or
248 not we're going to have virtual baseclasses. */
249 if (processing_template_decl
)
252 /* We don't need an in-charge parameter for constructors that don't
253 have virtual bases. */
254 if (DECL_CONSTRUCTOR_P (fn
)
255 && !CLASSTYPE_VBASECLASSES (DECL_CONTEXT (fn
)))
258 arg_types
= TYPE_ARG_TYPES (TREE_TYPE (fn
));
259 basetype
= TREE_TYPE (TREE_VALUE (arg_types
));
260 arg_types
= TREE_CHAIN (arg_types
);
262 parms
= DECL_CHAIN (DECL_ARGUMENTS (fn
));
264 /* If this is a subobject constructor or destructor, our caller will
265 pass us a pointer to our VTT. */
266 if (CLASSTYPE_VBASECLASSES (DECL_CONTEXT (fn
)))
268 parm
= build_artificial_parm (vtt_parm_identifier
, vtt_parm_type
);
270 /* First add it to DECL_ARGUMENTS between 'this' and the real args... */
271 DECL_CHAIN (parm
) = parms
;
274 /* ...and then to TYPE_ARG_TYPES. */
275 arg_types
= hash_tree_chain (vtt_parm_type
, arg_types
);
277 DECL_HAS_VTT_PARM_P (fn
) = 1;
280 /* Then add the in-charge parm (before the VTT parm). */
281 parm
= build_artificial_parm (in_charge_identifier
, integer_type_node
);
282 DECL_CHAIN (parm
) = parms
;
284 arg_types
= hash_tree_chain (integer_type_node
, arg_types
);
286 /* Insert our new parameter(s) into the list. */
287 DECL_CHAIN (DECL_ARGUMENTS (fn
)) = parms
;
289 /* And rebuild the function type. */
290 fntype
= build_method_type_directly (basetype
, TREE_TYPE (TREE_TYPE (fn
)),
292 if (TYPE_RAISES_EXCEPTIONS (TREE_TYPE (fn
)))
293 fntype
= build_exception_variant (fntype
,
294 TYPE_RAISES_EXCEPTIONS (TREE_TYPE (fn
)));
295 if (TYPE_ATTRIBUTES (TREE_TYPE (fn
)))
296 fntype
= (cp_build_type_attribute_variant
297 (fntype
, TYPE_ATTRIBUTES (TREE_TYPE (fn
))));
298 TREE_TYPE (fn
) = fntype
;
300 /* Now we've got the in-charge parameter. */
301 DECL_HAS_IN_CHARGE_PARM_P (fn
) = 1;
304 /* Classes overload their constituent function names automatically.
305 When a function name is declared in a record structure,
306 its name is changed to it overloaded name. Since names for
307 constructors and destructors can conflict, we place a leading
310 CNAME is the name of the class we are grokking for.
312 FUNCTION is a FUNCTION_DECL. It was created by `grokdeclarator'.
314 FLAGS contains bits saying what's special about today's
315 arguments. DTOR_FLAG == DESTRUCTOR.
317 If FUNCTION is a destructor, then we must add the `auto-delete' field
318 as a second parameter. There is some hair associated with the fact
319 that we must "declare" this variable in the manner consistent with the
320 way the rest of the arguments were declared.
322 QUALS are the qualifiers for the this pointer. */
325 grokclassfn (tree ctype
, tree function
, enum overload_flags flags
)
327 tree fn_name
= DECL_NAME (function
);
329 /* Even within an `extern "C"' block, members get C++ linkage. See
330 [dcl.link] for details. */
331 SET_DECL_LANGUAGE (function
, lang_cplusplus
);
333 if (fn_name
== NULL_TREE
)
335 error ("name missing for member function");
336 fn_name
= get_identifier ("<anonymous>");
337 DECL_NAME (function
) = fn_name
;
340 DECL_CONTEXT (function
) = ctype
;
342 if (flags
== DTOR_FLAG
)
343 DECL_DESTRUCTOR_P (function
) = 1;
345 if (flags
== DTOR_FLAG
|| DECL_CONSTRUCTOR_P (function
))
346 maybe_retrofit_in_chrg (function
);
349 /* Create an ARRAY_REF, checking for the user doing things backwards
350 along the way. DECLTYPE_P is for N3276, as in the parser. */
353 grok_array_decl (location_t loc
, tree array_expr
, tree index_exp
,
358 tree orig_array_expr
= array_expr
;
359 tree orig_index_exp
= index_exp
;
360 tree overload
= NULL_TREE
;
362 if (error_operand_p (array_expr
) || error_operand_p (index_exp
))
363 return error_mark_node
;
365 if (processing_template_decl
)
367 if (type_dependent_expression_p (array_expr
)
368 || type_dependent_expression_p (index_exp
))
369 return build_min_nt_loc (loc
, ARRAY_REF
, array_expr
, index_exp
,
370 NULL_TREE
, NULL_TREE
);
371 array_expr
= build_non_dependent_expr (array_expr
);
372 index_exp
= build_non_dependent_expr (index_exp
);
375 type
= TREE_TYPE (array_expr
);
377 type
= non_reference (type
);
379 /* If they have an `operator[]', use that. */
380 if (MAYBE_CLASS_TYPE_P (type
) || MAYBE_CLASS_TYPE_P (TREE_TYPE (index_exp
)))
382 tsubst_flags_t complain
= tf_warning_or_error
;
384 complain
|= tf_decltype
;
385 expr
= build_new_op (loc
, ARRAY_REF
, LOOKUP_NORMAL
, array_expr
,
386 index_exp
, NULL_TREE
, &overload
, complain
);
392 /* Otherwise, create an ARRAY_REF for a pointer or array type.
393 It is a little-known fact that, if `a' is an array and `i' is
394 an int, you can write `i[a]', which means the same thing as
396 if (TREE_CODE (type
) == ARRAY_TYPE
|| VECTOR_TYPE_P (type
))
399 p1
= build_expr_type_conversion (WANT_POINTER
, array_expr
, false);
401 if (TREE_CODE (TREE_TYPE (index_exp
)) == ARRAY_TYPE
)
404 p2
= build_expr_type_conversion (WANT_POINTER
, index_exp
, false);
406 i1
= build_expr_type_conversion (WANT_INT
| WANT_ENUM
, array_expr
,
408 i2
= build_expr_type_conversion (WANT_INT
| WANT_ENUM
, index_exp
,
411 if ((p1
&& i2
) && (i1
&& p2
))
412 error ("ambiguous conversion for array subscript");
415 array_expr
= p1
, index_exp
= i2
;
417 array_expr
= p2
, index_exp
= i1
;
420 error ("invalid types %<%T[%T]%> for array subscript",
421 type
, TREE_TYPE (index_exp
));
422 return error_mark_node
;
425 if (array_expr
== error_mark_node
|| index_exp
== error_mark_node
)
426 error ("ambiguous conversion for array subscript");
428 expr
= build_array_ref (input_location
, array_expr
, index_exp
);
430 if (processing_template_decl
&& expr
!= error_mark_node
)
432 if (overload
!= NULL_TREE
)
433 return (build_min_non_dep_op_overload
434 (ARRAY_REF
, expr
, overload
, orig_array_expr
, orig_index_exp
));
436 return build_min_non_dep (ARRAY_REF
, expr
, orig_array_expr
, orig_index_exp
,
437 NULL_TREE
, NULL_TREE
);
442 /* Given the cast expression EXP, checking out its validity. Either return
443 an error_mark_node if there was an unavoidable error, return a cast to
444 void for trying to delete a pointer w/ the value 0, or return the
445 call to delete. If DOING_VEC is true, we handle things differently
446 for doing an array delete.
447 Implements ARM $5.3.4. This is called from the parser. */
450 delete_sanity (tree exp
, tree size
, bool doing_vec
, int use_global_delete
,
451 tsubst_flags_t complain
)
455 if (exp
== error_mark_node
)
458 if (processing_template_decl
)
460 t
= build_min (DELETE_EXPR
, void_type_node
, exp
, size
);
461 DELETE_EXPR_USE_GLOBAL (t
) = use_global_delete
;
462 DELETE_EXPR_USE_VEC (t
) = doing_vec
;
463 TREE_SIDE_EFFECTS (t
) = 1;
467 /* An array can't have been allocated by new, so complain. */
468 if (TREE_CODE (TREE_TYPE (exp
)) == ARRAY_TYPE
)
469 warning (0, "deleting array %q#E", exp
);
471 t
= build_expr_type_conversion (WANT_POINTER
, exp
, true);
473 if (t
== NULL_TREE
|| t
== error_mark_node
)
475 error ("type %q#T argument given to %<delete%>, expected pointer",
477 return error_mark_node
;
480 type
= TREE_TYPE (t
);
482 /* As of Valley Forge, you can delete a pointer to const. */
484 /* You can't delete functions. */
485 if (TREE_CODE (TREE_TYPE (type
)) == FUNCTION_TYPE
)
487 error ("cannot delete a function. Only pointer-to-objects are "
488 "valid arguments to %<delete%>");
489 return error_mark_node
;
492 /* Deleting ptr to void is undefined behavior [expr.delete/3]. */
493 if (VOID_TYPE_P (TREE_TYPE (type
)))
495 warning (OPT_Wdelete_incomplete
, "deleting %qT is undefined", type
);
499 /* Deleting a pointer with the value zero is valid and has no effect. */
500 if (integer_zerop (t
))
501 return build1 (NOP_EXPR
, void_type_node
, t
);
504 return build_vec_delete (t
, /*maxindex=*/NULL_TREE
,
505 sfk_deleting_destructor
,
506 use_global_delete
, complain
);
508 return build_delete (type
, t
, sfk_deleting_destructor
,
509 LOOKUP_NORMAL
, use_global_delete
,
513 /* Report an error if the indicated template declaration is not the
514 sort of thing that should be a member template. */
517 check_member_template (tree tmpl
)
521 gcc_assert (TREE_CODE (tmpl
) == TEMPLATE_DECL
);
522 decl
= DECL_TEMPLATE_RESULT (tmpl
);
524 if (TREE_CODE (decl
) == FUNCTION_DECL
525 || DECL_ALIAS_TEMPLATE_P (tmpl
)
526 || (TREE_CODE (decl
) == TYPE_DECL
527 && MAYBE_CLASS_TYPE_P (TREE_TYPE (decl
))))
529 /* The parser rejects template declarations in local classes
530 (with the exception of generic lambdas). */
531 gcc_assert (!current_function_decl
|| LAMBDA_FUNCTION_P (decl
));
532 /* The parser rejects any use of virtual in a function template. */
533 gcc_assert (!(TREE_CODE (decl
) == FUNCTION_DECL
534 && DECL_VIRTUAL_P (decl
)));
536 /* The debug-information generating code doesn't know what to do
537 with member templates. */
538 DECL_IGNORED_P (tmpl
) = 1;
540 else if (variable_template_p (tmpl
))
543 error ("template declaration of %q#D", decl
);
546 /* Sanity check: report error if this function FUNCTION is not
547 really a member of the class (CTYPE) it is supposed to belong to.
548 TEMPLATE_PARMS is used to specify the template parameters of a member
549 template passed as FUNCTION_DECL. If the member template is passed as a
550 TEMPLATE_DECL, it can be NULL since the parameters can be extracted
551 from the declaration. If the function is not a function template, it
553 It returns the original declaration for the function, NULL_TREE if
554 no declaration was found, error_mark_node if an error was emitted. */
557 check_classfn (tree ctype
, tree function
, tree template_parms
)
563 if (DECL_USE_TEMPLATE (function
)
564 && !(TREE_CODE (function
) == TEMPLATE_DECL
565 && DECL_TEMPLATE_SPECIALIZATION (function
))
566 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (function
)))
567 /* Since this is a specialization of a member template,
568 we're not going to find the declaration in the class.
571 struct S { template <typename T> void f(T); };
572 template <> void S::f(int);
574 we're not going to find `S::f(int)', but there's no
575 reason we should, either. We let our callers know we didn't
576 find the method, but we don't complain. */
579 /* Basic sanity check: for a template function, the template parameters
580 either were not passed, or they are the same of DECL_TEMPLATE_PARMS. */
581 if (TREE_CODE (function
) == TEMPLATE_DECL
)
584 && !comp_template_parms (template_parms
,
585 DECL_TEMPLATE_PARMS (function
)))
587 error ("template parameter lists provided don%'t match the "
588 "template parameters of %qD", function
);
589 return error_mark_node
;
591 template_parms
= DECL_TEMPLATE_PARMS (function
);
594 /* OK, is this a definition of a member template? */
595 is_template
= (template_parms
!= NULL_TREE
);
599 A destructor shall not be a member template. */
600 if (DECL_DESTRUCTOR_P (function
) && is_template
)
602 error ("destructor %qD declared as member template", function
);
603 return error_mark_node
;
606 /* We must enter the scope here, because conversion operators are
607 named by target type, and type equivalence relies on typenames
608 resolving within the scope of CTYPE. */
609 pushed_scope
= push_scope (ctype
);
610 ix
= class_method_index_for_fn (complete_type (ctype
), function
);
613 vec
<tree
, va_gc
> *methods
= CLASSTYPE_METHOD_VEC (ctype
);
615 for (ovl_iterator
iter ((*methods
)[ix
]); iter
; ++iter
)
618 tree p1
= TYPE_ARG_TYPES (TREE_TYPE (function
));
619 tree p2
= TYPE_ARG_TYPES (TREE_TYPE (fndecl
));
621 /* We cannot simply call decls_match because this doesn't
622 work for static member functions that are pretending to
623 be methods, and because the name may have been changed by
626 /* Get rid of the this parameter on functions that become
628 if (DECL_STATIC_FUNCTION_P (fndecl
)
629 && TREE_CODE (TREE_TYPE (function
)) == METHOD_TYPE
)
630 p1
= TREE_CHAIN (p1
);
632 /* A member template definition only matches a member template
634 if (is_template
!= (TREE_CODE (fndecl
) == TEMPLATE_DECL
))
637 /* ref-qualifier or absence of same must match. */
638 if (type_memfn_rqual (TREE_TYPE (function
))
639 != type_memfn_rqual (TREE_TYPE (fndecl
)))
642 // Include constraints in the match.
643 tree c1
= get_constraints (function
);
644 tree c2
= get_constraints (fndecl
);
646 /* While finding a match, same types and params are not enough
647 if the function is versioned. Also check version ("target")
649 if (same_type_p (TREE_TYPE (TREE_TYPE (function
)),
650 TREE_TYPE (TREE_TYPE (fndecl
)))
651 && compparms (p1
, p2
)
652 && !targetm
.target_option
.function_versions (function
, fndecl
)
654 || comp_template_parms (template_parms
,
655 DECL_TEMPLATE_PARMS (fndecl
)))
656 && equivalent_constraints (c1
, c2
)
657 && (DECL_TEMPLATE_SPECIALIZATION (function
)
658 == DECL_TEMPLATE_SPECIALIZATION (fndecl
))
659 && (!DECL_TEMPLATE_SPECIALIZATION (function
)
660 || (DECL_TI_TEMPLATE (function
)
661 == DECL_TI_TEMPLATE (fndecl
))))
664 pop_scope (pushed_scope
);
669 error_at (DECL_SOURCE_LOCATION (function
),
670 "prototype for %q#D does not match any in class %qT",
673 const char *format
= NULL
;
674 tree first
= OVL_FIRST ((*methods
)[ix
]);
675 bool is_conv_op
= DECL_CONV_FN_P (first
);
676 tree prev
= NULL_TREE
;
679 ix
= CLASSTYPE_FIRST_CONVERSION_SLOT
;
682 ovl_iterator
iter ((*methods
)[ix
++]);
683 if (is_conv_op
&& !DECL_CONV_FN_P (*iter
))
690 format
= N_("candidates are: %+#D");
691 error (format
, prev
);
697 while (is_conv_op
&& size_t (ix
) < methods
->length ());
701 format
= N_("candidate is: %+#D");
702 error (format
, prev
);
705 else if (!COMPLETE_TYPE_P (ctype
))
706 cxx_incomplete_type_error (function
, ctype
);
708 error ("no %q#D member function declared in class %qT",
712 pop_scope (pushed_scope
);
713 return error_mark_node
;
716 /* DECL is a function with vague linkage. Remember it so that at the
717 end of the translation unit we can decide whether or not to emit
721 note_vague_linkage_fn (tree decl
)
723 DECL_DEFER_OUTPUT (decl
) = 1;
724 vec_safe_push (deferred_fns
, decl
);
727 /* As above, but for variable template instantiations. */
730 note_variable_template_instantiation (tree decl
)
732 vec_safe_push (pending_statics
, decl
);
735 /* We have just processed the DECL, which is a static data member.
736 The other parameters are as for cp_finish_decl. */
739 finish_static_data_member_decl (tree decl
,
740 tree init
, bool init_const_expr_p
,
744 DECL_CONTEXT (decl
) = current_class_type
;
746 /* We cannot call pushdecl here, because that would fill in the
747 TREE_CHAIN of our decl. Instead, we modify cp_finish_decl to do
748 the right thing, namely, to put this decl out straight away. */
750 if (! processing_template_decl
)
751 vec_safe_push (pending_statics
, decl
);
753 if (LOCAL_CLASS_P (current_class_type
)
754 /* We already complained about the template definition. */
755 && !DECL_TEMPLATE_INSTANTIATION (decl
))
756 permerror (input_location
, "local class %q#T shall not have static data member %q#D",
757 current_class_type
, decl
);
759 for (tree t
= current_class_type
; TYPE_P (t
);
760 t
= CP_TYPE_CONTEXT (t
))
761 if (TYPE_UNNAMED_P (t
))
763 if (permerror (DECL_SOURCE_LOCATION (decl
),
764 "static data member %qD in unnamed class", decl
))
765 inform (DECL_SOURCE_LOCATION (TYPE_NAME (t
)),
766 "unnamed class defined here");
770 DECL_IN_AGGR_P (decl
) = 1;
772 if (TREE_CODE (TREE_TYPE (decl
)) == ARRAY_TYPE
773 && TYPE_DOMAIN (TREE_TYPE (decl
)) == NULL_TREE
)
774 SET_VAR_HAD_UNKNOWN_BOUND (decl
);
776 cp_finish_decl (decl
, init
, init_const_expr_p
, asmspec_tree
, flags
);
779 /* DECLARATOR and DECLSPECS correspond to a class member. The other
780 parameters are as for cp_finish_decl. Return the DECL for the
781 class member declared. */
784 grokfield (const cp_declarator
*declarator
,
785 cp_decl_specifier_seq
*declspecs
,
786 tree init
, bool init_const_expr_p
,
791 const char *asmspec
= 0;
796 && TREE_CODE (init
) == TREE_LIST
797 && TREE_VALUE (init
) == error_mark_node
798 && TREE_CHAIN (init
) == NULL_TREE
)
801 value
= grokdeclarator (declarator
, declspecs
, FIELD
, init
!= 0, &attrlist
);
802 if (! value
|| value
== error_mark_node
)
803 /* friend or constructor went bad. */
804 return error_mark_node
;
805 if (TREE_TYPE (value
) == error_mark_node
)
808 if (TREE_CODE (value
) == TYPE_DECL
&& init
)
810 error ("typedef %qD is initialized (use decltype instead)", value
);
814 /* Pass friendly classes back. */
815 if (value
== void_type_node
)
819 name
= DECL_NAME (value
);
821 if (name
!= NULL_TREE
)
823 if (TREE_CODE (name
) == TEMPLATE_ID_EXPR
)
825 error ("explicit template argument list not allowed");
826 return error_mark_node
;
829 if (IDENTIFIER_POINTER (name
)[0] == '_'
830 && id_equal (name
, "_vptr"))
831 error ("member %qD conflicts with virtual function table field name",
835 /* Stash away type declarations. */
836 if (TREE_CODE (value
) == TYPE_DECL
)
838 DECL_NONLOCAL (value
) = 1;
839 DECL_CONTEXT (value
) = current_class_type
;
845 /* If this is a typedef that names the class for linkage purposes
846 (7.1.3p8), apply any attributes directly to the type. */
847 if (OVERLOAD_TYPE_P (TREE_TYPE (value
))
848 && value
== TYPE_NAME (TYPE_MAIN_VARIANT (TREE_TYPE (value
))))
849 attrflags
= ATTR_FLAG_TYPE_IN_PLACE
;
851 cplus_decl_attributes (&value
, attrlist
, attrflags
);
854 if (decl_spec_seq_has_spec_p (declspecs
, ds_typedef
)
855 && TREE_TYPE (value
) != error_mark_node
856 && TYPE_NAME (TYPE_MAIN_VARIANT (TREE_TYPE (value
))) != value
)
857 set_underlying_type (value
);
859 /* It's important that push_template_decl below follows
860 set_underlying_type above so that the created template
861 carries the properly set type of VALUE. */
862 if (processing_template_decl
)
863 value
= push_template_decl (value
);
865 record_locally_defined_typedef (value
);
869 int friendp
= decl_spec_seq_has_spec_p (declspecs
, ds_friend
);
871 if (!friendp
&& DECL_IN_AGGR_P (value
))
873 error ("%qD is already defined in %qT", value
, DECL_CONTEXT (value
));
874 return void_type_node
;
877 if (asmspec_tree
&& asmspec_tree
!= error_mark_node
)
878 asmspec
= TREE_STRING_POINTER (asmspec_tree
);
882 if (TREE_CODE (value
) == FUNCTION_DECL
)
884 if (init
== ridpointers
[(int)RID_DELETE
])
886 DECL_DELETED_FN (value
) = 1;
887 DECL_DECLARED_INLINE_P (value
) = 1;
888 DECL_INITIAL (value
) = error_mark_node
;
890 else if (init
== ridpointers
[(int)RID_DEFAULT
])
892 if (defaultable_fn_check (value
))
894 DECL_DEFAULTED_FN (value
) = 1;
895 DECL_INITIALIZED_IN_CLASS_P (value
) = 1;
896 DECL_DECLARED_INLINE_P (value
) = 1;
899 else if (TREE_CODE (init
) == DEFAULT_ARG
)
900 error ("invalid initializer for member function %qD", value
);
901 else if (TREE_CODE (TREE_TYPE (value
)) == METHOD_TYPE
)
903 if (integer_zerop (init
))
904 DECL_PURE_VIRTUAL_P (value
) = 1;
905 else if (error_operand_p (init
))
906 ; /* An error has already been reported. */
908 error ("invalid initializer for member function %qD",
913 gcc_assert (TREE_CODE (TREE_TYPE (value
)) == FUNCTION_TYPE
);
915 error ("initializer specified for friend function %qD",
918 error ("initializer specified for static member function %qD",
922 else if (TREE_CODE (value
) == FIELD_DECL
)
923 /* C++11 NSDMI, keep going. */;
924 else if (!VAR_P (value
))
928 /* Pass friend decls back. */
929 if ((TREE_CODE (value
) == FUNCTION_DECL
930 || TREE_CODE (value
) == TEMPLATE_DECL
)
931 && DECL_CONTEXT (value
) != current_class_type
)
934 /* Need to set this before push_template_decl. */
936 DECL_CONTEXT (value
) = current_class_type
;
938 if (processing_template_decl
&& VAR_OR_FUNCTION_DECL_P (value
))
940 value
= push_template_decl (value
);
941 if (error_operand_p (value
))
942 return error_mark_node
;
946 cplus_decl_attributes (&value
, attrlist
, 0);
948 if (init
&& DIRECT_LIST_INIT_P (init
))
949 flags
= LOOKUP_NORMAL
;
951 flags
= LOOKUP_IMPLICIT
;
953 switch (TREE_CODE (value
))
956 finish_static_data_member_decl (value
, init
, init_const_expr_p
,
957 asmspec_tree
, flags
);
962 error ("%<asm%> specifiers are not permitted on non-static data members");
963 if (DECL_INITIAL (value
) == error_mark_node
)
964 init
= error_mark_node
;
965 cp_finish_decl (value
, init
, /*init_const_expr_p=*/false,
967 DECL_IN_AGGR_P (value
) = 1;
972 set_user_assembler_name (value
, asmspec
);
974 cp_finish_decl (value
,
976 /*init_const_expr_p=*/false,
977 asmspec_tree
, flags
);
979 /* Pass friends back this way. */
980 if (DECL_FRIEND_P (value
))
981 return void_type_node
;
983 DECL_IN_AGGR_P (value
) = 1;
992 /* Like `grokfield', but for bitfields.
993 WIDTH is non-NULL for bit fields only, and is an INTEGER_CST node. */
996 grokbitfield (const cp_declarator
*declarator
,
997 cp_decl_specifier_seq
*declspecs
, tree width
,
1000 tree value
= grokdeclarator (declarator
, declspecs
, BITFIELD
, 0, &attrlist
);
1002 if (value
== error_mark_node
)
1003 return NULL_TREE
; /* friends went bad. */
1004 if (TREE_TYPE (value
) == error_mark_node
)
1007 /* Pass friendly classes back. */
1008 if (VOID_TYPE_P (value
))
1009 return void_type_node
;
1011 if (!INTEGRAL_OR_ENUMERATION_TYPE_P (TREE_TYPE (value
))
1012 && (POINTER_TYPE_P (value
)
1013 || !dependent_type_p (TREE_TYPE (value
))))
1015 error ("bit-field %qD with non-integral type", value
);
1016 return error_mark_node
;
1019 if (TREE_CODE (value
) == TYPE_DECL
)
1021 error ("cannot declare %qD to be a bit-field type", value
);
1025 /* Usually, finish_struct_1 catches bitfields with invalid types.
1026 But, in the case of bitfields with function type, we confuse
1027 ourselves into thinking they are member functions, so we must
1029 if (TREE_CODE (value
) == FUNCTION_DECL
)
1031 error ("cannot declare bit-field %qD with function type",
1036 if (DECL_IN_AGGR_P (value
))
1038 error ("%qD is already defined in the class %qT", value
,
1039 DECL_CONTEXT (value
));
1040 return void_type_node
;
1043 if (TREE_STATIC (value
))
1045 error ("static member %qD cannot be a bit-field", value
);
1048 cp_finish_decl (value
, NULL_TREE
, false, NULL_TREE
, 0);
1050 if (width
!= error_mark_node
)
1052 /* The width must be an integer type. */
1053 if (!type_dependent_expression_p (width
)
1054 && !INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (TREE_TYPE (width
)))
1055 error ("width of bit-field %qD has non-integral type %qT", value
,
1059 DECL_INITIAL (value
) = width
;
1060 SET_DECL_C_BIT_FIELD (value
);
1064 DECL_IN_AGGR_P (value
) = 1;
1067 cplus_decl_attributes (&value
, attrlist
, /*flags=*/0);
1073 /* Returns true iff ATTR is an attribute which needs to be applied at
1074 instantiation time rather than template definition time. */
1077 is_late_template_attribute (tree attr
, tree decl
)
1079 tree name
= get_attribute_name (attr
);
1080 tree args
= TREE_VALUE (attr
);
1081 const struct attribute_spec
*spec
= lookup_attribute_spec (name
);
1085 /* Unknown attribute. */
1088 /* Attribute weak handling wants to write out assembly right away. */
1089 if (is_attribute_p ("weak", name
))
1092 /* Attribute unused is applied directly, as it appertains to
1094 if (is_attribute_p ("unused", name
))
1097 /* Attribute tls_model wants to modify the symtab. */
1098 if (is_attribute_p ("tls_model", name
))
1101 /* #pragma omp declare simd attribute needs to be always deferred. */
1103 && is_attribute_p ("omp declare simd", name
))
1106 /* An attribute pack is clearly dependent. */
1107 if (args
&& PACK_EXPANSION_P (args
))
1110 /* If any of the arguments are dependent expressions, we can't evaluate
1111 the attribute until instantiation time. */
1112 for (arg
= args
; arg
; arg
= TREE_CHAIN (arg
))
1114 tree t
= TREE_VALUE (arg
);
1116 /* If the first attribute argument is an identifier, only consider
1117 second and following arguments. Attributes like mode, format,
1118 cleanup and several target specific attributes aren't late
1119 just because they have an IDENTIFIER_NODE as first argument. */
1120 if (arg
== args
&& attribute_takes_identifier_p (name
)
1121 && identifier_p (t
))
1124 if (value_dependent_expression_p (t
)
1125 || type_dependent_expression_p (t
))
1129 if (TREE_CODE (decl
) == TYPE_DECL
1131 || spec
->type_required
)
1133 tree type
= TYPE_P (decl
) ? decl
: TREE_TYPE (decl
);
1135 /* We can't apply any attributes to a completely unknown type until
1136 instantiation time. */
1137 enum tree_code code
= TREE_CODE (type
);
1138 if (code
== TEMPLATE_TYPE_PARM
1139 || code
== BOUND_TEMPLATE_TEMPLATE_PARM
1140 || code
== TYPENAME_TYPE
)
1142 /* Also defer most attributes on dependent types. This is not
1143 necessary in all cases, but is the better default. */
1144 else if (dependent_type_p (type
)
1145 /* But some attributes specifically apply to templates. */
1146 && !is_attribute_p ("abi_tag", name
)
1147 && !is_attribute_p ("deprecated", name
)
1148 && !is_attribute_p ("visibility", name
))
1157 /* ATTR_P is a list of attributes. Remove any attributes which need to be
1158 applied at instantiation time and return them. If IS_DEPENDENT is true,
1159 the declaration itself is dependent, so all attributes should be applied
1160 at instantiation time. */
1163 splice_template_attributes (tree
*attr_p
, tree decl
)
1166 tree late_attrs
= NULL_TREE
;
1167 tree
*q
= &late_attrs
;
1174 if (is_late_template_attribute (*p
, decl
))
1176 ATTR_IS_DEPENDENT (*p
) = 1;
1178 *p
= TREE_CHAIN (*p
);
1179 q
= &TREE_CHAIN (*q
);
1183 p
= &TREE_CHAIN (*p
);
1189 /* Remove any late attributes from the list in ATTR_P and attach them to
1193 save_template_attributes (tree
*attr_p
, tree
*decl_p
)
1197 if (attr_p
&& *attr_p
== error_mark_node
)
1200 tree late_attrs
= splice_template_attributes (attr_p
, *decl_p
);
1204 if (DECL_P (*decl_p
))
1205 q
= &DECL_ATTRIBUTES (*decl_p
);
1207 q
= &TYPE_ATTRIBUTES (*decl_p
);
1209 tree old_attrs
= *q
;
1211 /* Merge the late attributes at the beginning with the attribute
1213 late_attrs
= merge_attributes (late_attrs
, *q
);
1216 if (!DECL_P (*decl_p
) && *decl_p
== TYPE_MAIN_VARIANT (*decl_p
))
1218 /* We've added new attributes directly to the main variant, so
1219 now we need to update all of the other variants to include
1220 these new attributes. */
1222 for (variant
= TYPE_NEXT_VARIANT (*decl_p
); variant
;
1223 variant
= TYPE_NEXT_VARIANT (variant
))
1225 gcc_assert (TYPE_ATTRIBUTES (variant
) == old_attrs
);
1226 TYPE_ATTRIBUTES (variant
) = TYPE_ATTRIBUTES (*decl_p
);
1231 /* True if ATTRS contains any dependent attributes that affect type
1235 any_dependent_type_attributes_p (tree attrs
)
1237 for (tree a
= attrs
; a
; a
= TREE_CHAIN (a
))
1238 if (ATTR_IS_DEPENDENT (a
))
1240 const attribute_spec
*as
= lookup_attribute_spec (TREE_PURPOSE (a
));
1241 if (as
&& as
->affects_type_identity
)
1247 /* Return true iff ATTRS are acceptable attributes to be applied in-place
1248 to a typedef which gives a previously unnamed class or enum a name for
1249 linkage purposes. */
1252 attributes_naming_typedef_ok (tree attrs
)
1254 for (; attrs
; attrs
= TREE_CHAIN (attrs
))
1256 tree name
= get_attribute_name (attrs
);
1257 if (is_attribute_p ("vector_size", name
))
1263 /* Like reconstruct_complex_type, but handle also template trees. */
1266 cp_reconstruct_complex_type (tree type
, tree bottom
)
1269 bool late_return_type_p
= false;
1271 if (TYPE_PTR_P (type
))
1273 inner
= cp_reconstruct_complex_type (TREE_TYPE (type
), bottom
);
1274 outer
= build_pointer_type_for_mode (inner
, TYPE_MODE (type
),
1275 TYPE_REF_CAN_ALIAS_ALL (type
));
1277 else if (TREE_CODE (type
) == REFERENCE_TYPE
)
1279 inner
= cp_reconstruct_complex_type (TREE_TYPE (type
), bottom
);
1280 outer
= build_reference_type_for_mode (inner
, TYPE_MODE (type
),
1281 TYPE_REF_CAN_ALIAS_ALL (type
));
1283 else if (TREE_CODE (type
) == ARRAY_TYPE
)
1285 inner
= cp_reconstruct_complex_type (TREE_TYPE (type
), bottom
);
1286 outer
= build_cplus_array_type (inner
, TYPE_DOMAIN (type
));
1287 /* Don't call cp_build_qualified_type on ARRAY_TYPEs, the
1288 element type qualification will be handled by the recursive
1289 cp_reconstruct_complex_type call and cp_build_qualified_type
1290 for ARRAY_TYPEs changes the element type. */
1293 else if (TREE_CODE (type
) == FUNCTION_TYPE
)
1295 late_return_type_p
= TYPE_HAS_LATE_RETURN_TYPE (type
);
1296 inner
= cp_reconstruct_complex_type (TREE_TYPE (type
), bottom
);
1297 outer
= build_function_type (inner
, TYPE_ARG_TYPES (type
));
1298 outer
= apply_memfn_quals (outer
,
1299 type_memfn_quals (type
),
1300 type_memfn_rqual (type
));
1302 else if (TREE_CODE (type
) == METHOD_TYPE
)
1304 late_return_type_p
= TYPE_HAS_LATE_RETURN_TYPE (type
);
1305 inner
= cp_reconstruct_complex_type (TREE_TYPE (type
), bottom
);
1306 /* The build_method_type_directly() routine prepends 'this' to argument list,
1307 so we must compensate by getting rid of it. */
1309 = build_method_type_directly
1310 (class_of_this_parm (type
), inner
,
1311 TREE_CHAIN (TYPE_ARG_TYPES (type
)));
1313 else if (TREE_CODE (type
) == OFFSET_TYPE
)
1315 inner
= cp_reconstruct_complex_type (TREE_TYPE (type
), bottom
);
1316 outer
= build_offset_type (TYPE_OFFSET_BASETYPE (type
), inner
);
1321 if (TYPE_ATTRIBUTES (type
))
1322 outer
= cp_build_type_attribute_variant (outer
, TYPE_ATTRIBUTES (type
));
1323 outer
= cp_build_qualified_type (outer
, cp_type_quals (type
));
1325 if (late_return_type_p
)
1326 TYPE_HAS_LATE_RETURN_TYPE (outer
) = 1;
1331 /* Replaces any constexpr expression that may be into the attributes
1332 arguments with their reduced value. */
1335 cp_check_const_attributes (tree attributes
)
1337 if (attributes
== error_mark_node
)
1341 for (attr
= attributes
; attr
; attr
= TREE_CHAIN (attr
))
1344 for (arg
= TREE_VALUE (attr
); arg
; arg
= TREE_CHAIN (arg
))
1346 tree expr
= TREE_VALUE (arg
);
1348 TREE_VALUE (arg
) = maybe_constant_value (expr
);
1353 /* Return true if TYPE is an OpenMP mappable type. */
1355 cp_omp_mappable_type (tree type
)
1357 /* Mappable type has to be complete. */
1358 if (type
== error_mark_node
|| !COMPLETE_TYPE_P (type
))
1360 /* Arrays have mappable type if the elements have mappable type. */
1361 while (TREE_CODE (type
) == ARRAY_TYPE
)
1362 type
= TREE_TYPE (type
);
1363 /* A mappable type cannot contain virtual members. */
1364 if (CLASS_TYPE_P (type
) && CLASSTYPE_VTABLES (type
))
1366 /* All data members must be non-static. */
1367 if (CLASS_TYPE_P (type
))
1370 for (field
= TYPE_FIELDS (type
); field
; field
= DECL_CHAIN (field
))
1373 /* All fields must have mappable types. */
1374 else if (TREE_CODE (field
) == FIELD_DECL
1375 && !cp_omp_mappable_type (TREE_TYPE (field
)))
1381 /* Like decl_attributes, but handle C++ complexity. */
1384 cplus_decl_attributes (tree
*decl
, tree attributes
, int flags
)
1386 if (*decl
== NULL_TREE
|| *decl
== void_type_node
1387 || *decl
== error_mark_node
)
1390 /* Add implicit "omp declare target" attribute if requested. */
1391 if (scope_chain
->omp_declare_target_attribute
1393 && (TREE_STATIC (*decl
) || DECL_EXTERNAL (*decl
)))
1394 || TREE_CODE (*decl
) == FUNCTION_DECL
))
1397 && DECL_CLASS_SCOPE_P (*decl
))
1398 error ("%q+D static data member inside of declare target directive",
1400 else if (!processing_template_decl
1402 && !cp_omp_mappable_type (TREE_TYPE (*decl
)))
1403 error ("%q+D in declare target directive does not have mappable type",
1406 attributes
= tree_cons (get_identifier ("omp declare target"),
1407 NULL_TREE
, attributes
);
1410 if (processing_template_decl
)
1412 if (check_for_bare_parameter_packs (attributes
))
1415 save_template_attributes (&attributes
, decl
);
1418 cp_check_const_attributes (attributes
);
1420 if (TREE_CODE (*decl
) == TEMPLATE_DECL
)
1421 decl
= &DECL_TEMPLATE_RESULT (*decl
);
1423 if (TREE_TYPE (*decl
) && TYPE_PTRMEMFUNC_P (TREE_TYPE (*decl
)))
1426 = decl_attributes (decl
, attributes
, flags
| ATTR_FLAG_FUNCTION_NEXT
);
1427 decl_attributes (&TYPE_PTRMEMFUNC_FN_TYPE_RAW (TREE_TYPE (*decl
)),
1431 decl_attributes (decl
, attributes
, flags
);
1433 if (TREE_CODE (*decl
) == TYPE_DECL
)
1434 SET_IDENTIFIER_TYPE_VALUE (DECL_NAME (*decl
), TREE_TYPE (*decl
));
1436 /* Propagate deprecation out to the template. */
1437 if (TREE_DEPRECATED (*decl
))
1438 if (tree ti
= get_template_info (*decl
))
1440 tree tmpl
= TI_TEMPLATE (ti
);
1441 tree pattern
= (TYPE_P (*decl
) ? TREE_TYPE (tmpl
)
1442 : DECL_TEMPLATE_RESULT (tmpl
));
1443 if (*decl
== pattern
)
1444 TREE_DEPRECATED (tmpl
) = true;
1448 /* Walks through the namespace- or function-scope anonymous union
1449 OBJECT, with the indicated TYPE, building appropriate VAR_DECLs.
1450 Returns one of the fields for use in the mangled name. */
1453 build_anon_union_vars (tree type
, tree object
)
1455 tree main_decl
= NULL_TREE
;
1458 /* Rather than write the code to handle the non-union case,
1459 just give an error. */
1460 if (TREE_CODE (type
) != UNION_TYPE
)
1462 error ("anonymous struct not inside named type");
1463 return error_mark_node
;
1466 for (field
= TYPE_FIELDS (type
);
1468 field
= DECL_CHAIN (field
))
1473 if (DECL_ARTIFICIAL (field
))
1475 if (TREE_CODE (field
) != FIELD_DECL
)
1477 permerror (DECL_SOURCE_LOCATION (field
),
1478 "%q#D invalid; an anonymous union can only "
1479 "have non-static data members", field
);
1483 if (TREE_PRIVATE (field
))
1484 permerror (DECL_SOURCE_LOCATION (field
),
1485 "private member %q#D in anonymous union", field
);
1486 else if (TREE_PROTECTED (field
))
1487 permerror (DECL_SOURCE_LOCATION (field
),
1488 "protected member %q#D in anonymous union", field
);
1490 if (processing_template_decl
)
1491 ref
= build_min_nt_loc (UNKNOWN_LOCATION
, COMPONENT_REF
, object
,
1492 DECL_NAME (field
), NULL_TREE
);
1494 ref
= build_class_member_access_expr (object
, field
, NULL_TREE
,
1495 false, tf_warning_or_error
);
1497 if (DECL_NAME (field
))
1501 decl
= build_decl (input_location
,
1502 VAR_DECL
, DECL_NAME (field
), TREE_TYPE (field
));
1503 DECL_ANON_UNION_VAR_P (decl
) = 1;
1504 DECL_ARTIFICIAL (decl
) = 1;
1506 base
= get_base_address (object
);
1507 TREE_PUBLIC (decl
) = TREE_PUBLIC (base
);
1508 TREE_STATIC (decl
) = TREE_STATIC (base
);
1509 DECL_EXTERNAL (decl
) = DECL_EXTERNAL (base
);
1511 SET_DECL_VALUE_EXPR (decl
, ref
);
1512 DECL_HAS_VALUE_EXPR_P (decl
) = 1;
1514 decl
= pushdecl (decl
);
1516 else if (ANON_AGGR_TYPE_P (TREE_TYPE (field
)))
1517 decl
= build_anon_union_vars (TREE_TYPE (field
), ref
);
1521 if (main_decl
== NULL_TREE
)
1528 /* Finish off the processing of a UNION_TYPE structure. If the union is an
1529 anonymous union, then all members must be laid out together. PUBLIC_P
1530 is nonzero if this union is not declared static. */
1533 finish_anon_union (tree anon_union_decl
)
1539 if (anon_union_decl
== error_mark_node
)
1542 type
= TREE_TYPE (anon_union_decl
);
1543 public_p
= TREE_PUBLIC (anon_union_decl
);
1545 /* The VAR_DECL's context is the same as the TYPE's context. */
1546 DECL_CONTEXT (anon_union_decl
) = DECL_CONTEXT (TYPE_NAME (type
));
1548 if (TYPE_FIELDS (type
) == NULL_TREE
)
1553 error ("namespace-scope anonymous aggregates must be static");
1557 main_decl
= build_anon_union_vars (type
, anon_union_decl
);
1558 if (main_decl
== error_mark_node
)
1560 if (main_decl
== NULL_TREE
)
1562 warning (0, "anonymous union with no members");
1566 if (!processing_template_decl
)
1568 /* Use main_decl to set the mangled name. */
1569 DECL_NAME (anon_union_decl
) = DECL_NAME (main_decl
);
1570 maybe_commonize_var (anon_union_decl
);
1571 if (TREE_STATIC (anon_union_decl
) || DECL_EXTERNAL (anon_union_decl
))
1572 mangle_decl (anon_union_decl
);
1573 DECL_NAME (anon_union_decl
) = NULL_TREE
;
1576 pushdecl (anon_union_decl
);
1577 cp_finish_decl (anon_union_decl
, NULL_TREE
, false, NULL_TREE
, 0);
1580 /* Auxiliary functions to make type signatures for
1581 `operator new' and `operator delete' correspond to
1582 what compiler will be expecting. */
1585 coerce_new_type (tree type
)
1588 tree args
= TYPE_ARG_TYPES (type
);
1590 gcc_assert (TREE_CODE (type
) == FUNCTION_TYPE
);
1592 if (!same_type_p (TREE_TYPE (type
), ptr_type_node
))
1595 error ("%<operator new%> must return type %qT", ptr_type_node
);
1598 if (args
&& args
!= void_list_node
)
1600 if (TREE_PURPOSE (args
))
1602 /* [basic.stc.dynamic.allocation]
1604 The first parameter shall not have an associated default
1606 error ("the first parameter of %<operator new%> cannot "
1607 "have a default argument");
1608 /* Throw away the default argument. */
1609 TREE_PURPOSE (args
) = NULL_TREE
;
1612 if (!same_type_p (TREE_VALUE (args
), size_type_node
))
1615 args
= TREE_CHAIN (args
);
1622 permerror (input_location
, "%<operator new%> takes type %<size_t%> (%qT) "
1623 "as first parameter", size_type_node
);
1628 args
= tree_cons (NULL_TREE
, size_type_node
, args
);
1631 type
= build_exception_variant
1632 (build_function_type (ptr_type_node
, args
),
1633 TYPE_RAISES_EXCEPTIONS (type
));
1641 coerce_delete_type (tree type
)
1644 tree args
= TYPE_ARG_TYPES (type
);
1646 gcc_assert (TREE_CODE (type
) == FUNCTION_TYPE
);
1648 if (!same_type_p (TREE_TYPE (type
), void_type_node
))
1651 error ("%<operator delete%> must return type %qT", void_type_node
);
1654 if (!args
|| args
== void_list_node
1655 || !same_type_p (TREE_VALUE (args
), ptr_type_node
))
1658 if (args
&& args
!= void_list_node
)
1659 args
= TREE_CHAIN (args
);
1660 error ("%<operator delete%> takes type %qT as first parameter",
1666 args
= tree_cons (NULL_TREE
, ptr_type_node
, args
);
1669 type
= build_exception_variant
1670 (build_function_type (void_type_node
, args
),
1671 TYPE_RAISES_EXCEPTIONS (type
));
1679 /* DECL is a VAR_DECL for a vtable: walk through the entries in the vtable
1680 and mark them as needed. */
1683 mark_vtable_entries (tree decl
)
1686 unsigned HOST_WIDE_INT idx
;
1688 /* It's OK for the vtable to refer to deprecated virtual functions. */
1689 warning_sentinel
w(warn_deprecated_decl
);
1691 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (DECL_INITIAL (decl
)),
1696 STRIP_NOPS (fnaddr
);
1698 if (TREE_CODE (fnaddr
) != ADDR_EXPR
1699 && TREE_CODE (fnaddr
) != FDESC_EXPR
)
1700 /* This entry is an offset: a virtual base class offset, a
1701 virtual call offset, an RTTI offset, etc. */
1704 fn
= TREE_OPERAND (fnaddr
, 0);
1705 TREE_ADDRESSABLE (fn
) = 1;
1706 /* When we don't have vcall offsets, we output thunks whenever
1707 we output the vtables that contain them. With vcall offsets,
1708 we know all the thunks we'll need when we emit a virtual
1709 function, so we emit the thunks there instead. */
1710 if (DECL_THUNK_P (fn
))
1711 use_thunk (fn
, /*emit_p=*/0);
1716 /* Set DECL up to have the closest approximation of "initialized common"
1717 linkage available. */
1720 comdat_linkage (tree decl
)
1723 make_decl_one_only (decl
, cxx_comdat_group (decl
));
1724 else if (TREE_CODE (decl
) == FUNCTION_DECL
1725 || (VAR_P (decl
) && DECL_ARTIFICIAL (decl
)))
1726 /* We can just emit function and compiler-generated variables
1727 statically; having multiple copies is (for the most part) only
1730 There are two correctness issues, however: the address of a
1731 template instantiation with external linkage should be the
1732 same, independent of what translation unit asks for the
1733 address, and this will not hold when we emit multiple copies of
1734 the function. However, there's little else we can do.
1736 Also, by default, the typeinfo implementation assumes that
1737 there will be only one copy of the string used as the name for
1738 each type. Therefore, if weak symbols are unavailable, the
1739 run-time library should perform a more conservative check; it
1740 should perform a string comparison, rather than an address
1742 TREE_PUBLIC (decl
) = 0;
1745 /* Static data member template instantiations, however, cannot
1746 have multiple copies. */
1747 if (DECL_INITIAL (decl
) == 0
1748 || DECL_INITIAL (decl
) == error_mark_node
)
1749 DECL_COMMON (decl
) = 1;
1750 else if (EMPTY_CONSTRUCTOR_P (DECL_INITIAL (decl
)))
1752 DECL_COMMON (decl
) = 1;
1753 DECL_INITIAL (decl
) = error_mark_node
;
1755 else if (!DECL_EXPLICIT_INSTANTIATION (decl
))
1757 /* We can't do anything useful; leave vars for explicit
1759 DECL_EXTERNAL (decl
) = 1;
1760 DECL_NOT_REALLY_EXTERN (decl
) = 0;
1764 if (TREE_PUBLIC (decl
))
1765 DECL_COMDAT (decl
) = 1;
1768 /* For win32 we also want to put explicit instantiations in
1769 linkonce sections, so that they will be merged with implicit
1770 instantiations; otherwise we get duplicate symbol errors.
1771 For Darwin we do not want explicit instantiations to be
1775 maybe_make_one_only (tree decl
)
1777 /* We used to say that this was not necessary on targets that support weak
1778 symbols, because the implicit instantiations will defer to the explicit
1779 one. However, that's not actually the case in SVR4; a strong definition
1780 after a weak one is an error. Also, not making explicit
1781 instantiations one_only means that we can end up with two copies of
1782 some template instantiations. */
1786 /* We can't set DECL_COMDAT on functions, or cp_finish_file will think
1787 we can get away with not emitting them if they aren't used. We need
1788 to for variables so that cp_finish_decl will update their linkage,
1789 because their DECL_INITIAL may not have been set properly yet. */
1791 if (!TARGET_WEAK_NOT_IN_ARCHIVE_TOC
1792 || (! DECL_EXPLICIT_INSTANTIATION (decl
)
1793 && ! DECL_TEMPLATE_SPECIALIZATION (decl
)))
1795 make_decl_one_only (decl
, cxx_comdat_group (decl
));
1799 varpool_node
*node
= varpool_node::get_create (decl
);
1800 DECL_COMDAT (decl
) = 1;
1801 /* Mark it needed so we don't forget to emit it. */
1802 node
->forced_by_abi
= true;
1803 TREE_USED (decl
) = 1;
1808 /* Returns true iff DECL, a FUNCTION_DECL or VAR_DECL, has vague linkage.
1809 This predicate will give the right answer during parsing of the
1810 function, which other tests may not. */
1813 vague_linkage_p (tree decl
)
1815 if (!TREE_PUBLIC (decl
))
1817 /* maybe_thunk_body clears TREE_PUBLIC on the maybe-in-charge 'tor
1818 variants, check one of the "clones" for the real linkage. */
1819 if ((DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P (decl
)
1820 || DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (decl
))
1821 && DECL_CHAIN (decl
)
1822 && DECL_CLONED_FUNCTION (DECL_CHAIN (decl
)))
1823 return vague_linkage_p (DECL_CHAIN (decl
));
1825 gcc_checking_assert (!DECL_COMDAT (decl
));
1828 /* Unfortunately, import_export_decl has not always been called
1829 before the function is processed, so we cannot simply check
1831 if (DECL_COMDAT (decl
)
1832 || (TREE_CODE (decl
) == FUNCTION_DECL
1833 && DECL_DECLARED_INLINE_P (decl
))
1834 || (DECL_LANG_SPECIFIC (decl
)
1835 && DECL_TEMPLATE_INSTANTIATION (decl
))
1836 || (VAR_P (decl
) && DECL_INLINE_VAR_P (decl
)))
1838 else if (DECL_FUNCTION_SCOPE_P (decl
))
1839 /* A local static in an inline effectively has vague linkage. */
1840 return (TREE_STATIC (decl
)
1841 && vague_linkage_p (DECL_CONTEXT (decl
)));
1846 /* Determine whether or not we want to specifically import or export CTYPE,
1847 using various heuristics. */
1850 import_export_class (tree ctype
)
1852 /* -1 for imported, 1 for exported. */
1853 int import_export
= 0;
1855 /* It only makes sense to call this function at EOF. The reason is
1856 that this function looks at whether or not the first non-inline
1857 non-abstract virtual member function has been defined in this
1858 translation unit. But, we can't possibly know that until we've
1859 seen the entire translation unit. */
1860 gcc_assert (at_eof
);
1862 if (CLASSTYPE_INTERFACE_KNOWN (ctype
))
1865 /* If MULTIPLE_SYMBOL_SPACES is set and we saw a #pragma interface,
1866 we will have CLASSTYPE_INTERFACE_ONLY set but not
1867 CLASSTYPE_INTERFACE_KNOWN. In that case, we don't want to use this
1868 heuristic because someone will supply a #pragma implementation
1869 elsewhere, and deducing it here would produce a conflict. */
1870 if (CLASSTYPE_INTERFACE_ONLY (ctype
))
1873 if (lookup_attribute ("dllimport", TYPE_ATTRIBUTES (ctype
)))
1875 else if (lookup_attribute ("dllexport", TYPE_ATTRIBUTES (ctype
)))
1877 else if (CLASSTYPE_IMPLICIT_INSTANTIATION (ctype
)
1878 && !flag_implicit_templates
)
1879 /* For a template class, without -fimplicit-templates, check the
1880 repository. If the virtual table is assigned to this
1881 translation unit, then export the class; otherwise, import
1883 import_export
= repo_export_class_p (ctype
) ? 1 : -1;
1884 else if (TYPE_POLYMORPHIC_P (ctype
))
1886 /* The ABI specifies that the virtual table and associated
1887 information are emitted with the key method, if any. */
1888 tree method
= CLASSTYPE_KEY_METHOD (ctype
);
1889 /* If weak symbol support is not available, then we must be
1890 careful not to emit the vtable when the key function is
1891 inline. An inline function can be defined in multiple
1892 translation units. If we were to emit the vtable in each
1893 translation unit containing a definition, we would get
1894 multiple definition errors at link-time. */
1895 if (method
&& (flag_weak
|| ! DECL_DECLARED_INLINE_P (method
)))
1896 import_export
= (DECL_REALLY_EXTERN (method
) ? -1 : 1);
1899 /* When MULTIPLE_SYMBOL_SPACES is set, we cannot count on seeing
1900 a definition anywhere else. */
1901 if (MULTIPLE_SYMBOL_SPACES
&& import_export
== -1)
1904 /* Allow back ends the chance to overrule the decision. */
1905 if (targetm
.cxx
.import_export_class
)
1906 import_export
= targetm
.cxx
.import_export_class (ctype
, import_export
);
1910 SET_CLASSTYPE_INTERFACE_KNOWN (ctype
);
1911 CLASSTYPE_INTERFACE_ONLY (ctype
) = (import_export
< 0);
1915 /* Return true if VAR has already been provided to the back end; in that
1916 case VAR should not be modified further by the front end. */
1918 var_finalized_p (tree var
)
1920 return varpool_node::get_create (var
)->definition
;
1923 /* DECL is a VAR_DECL or FUNCTION_DECL which, for whatever reason,
1924 must be emitted in this translation unit. Mark it as such. */
1927 mark_needed (tree decl
)
1929 TREE_USED (decl
) = 1;
1930 if (TREE_CODE (decl
) == FUNCTION_DECL
)
1932 /* Extern inline functions don't become needed when referenced.
1933 If we know a method will be emitted in other TU and no new
1934 functions can be marked reachable, just use the external
1936 struct cgraph_node
*node
= cgraph_node::get_create (decl
);
1937 node
->forced_by_abi
= true;
1939 /* #pragma interface and -frepo code can call mark_needed for
1940 maybe-in-charge 'tors; mark the clones as well. */
1942 FOR_EACH_CLONE (clone
, decl
)
1943 mark_needed (clone
);
1945 else if (VAR_P (decl
))
1947 varpool_node
*node
= varpool_node::get_create (decl
);
1948 /* C++ frontend use mark_decl_references to force COMDAT variables
1949 to be output that might appear dead otherwise. */
1950 node
->forced_by_abi
= true;
1954 /* DECL is either a FUNCTION_DECL or a VAR_DECL. This function
1955 returns true if a definition of this entity should be provided in
1956 this object file. Callers use this function to determine whether
1957 or not to let the back end know that a definition of DECL is
1958 available in this translation unit. */
1961 decl_needed_p (tree decl
)
1963 gcc_assert (VAR_OR_FUNCTION_DECL_P (decl
));
1964 /* This function should only be called at the end of the translation
1965 unit. We cannot be sure of whether or not something will be
1966 COMDAT until that point. */
1967 gcc_assert (at_eof
);
1969 /* All entities with external linkage that are not COMDAT/EXTERN should be
1970 emitted; they may be referred to from other object files. */
1971 if (TREE_PUBLIC (decl
) && !DECL_COMDAT (decl
) && !DECL_REALLY_EXTERN (decl
))
1973 /* Functions marked "dllexport" must be emitted so that they are
1974 visible to other DLLs. */
1975 if (flag_keep_inline_dllexport
1976 && lookup_attribute ("dllexport", DECL_ATTRIBUTES (decl
)))
1979 /* When not optimizing, do not bother to produce definitions for extern
1981 if (DECL_REALLY_EXTERN (decl
)
1982 && ((TREE_CODE (decl
) != FUNCTION_DECL
1984 || (TREE_CODE (decl
) == FUNCTION_DECL
1985 && !opt_for_fn (decl
, optimize
)))
1986 && !lookup_attribute ("always_inline", decl
))
1989 /* If this entity was used, let the back end see it; it will decide
1990 whether or not to emit it into the object file. */
1991 if (TREE_USED (decl
))
1993 /* Virtual functions might be needed for devirtualization. */
1994 if (flag_devirtualize
1995 && TREE_CODE (decl
) == FUNCTION_DECL
1996 && DECL_VIRTUAL_P (decl
))
1998 /* Otherwise, DECL does not need to be emitted -- yet. A subsequent
1999 reference to DECL might cause it to be emitted later. */
2003 /* If necessary, write out the vtables for the dynamic class CTYPE.
2004 Returns true if any vtables were emitted. */
2007 maybe_emit_vtables (tree ctype
)
2012 varpool_node
*current
= NULL
, *last
= NULL
;
2014 /* If the vtables for this class have already been emitted there is
2015 nothing more to do. */
2016 primary_vtbl
= CLASSTYPE_VTABLES (ctype
);
2017 if (var_finalized_p (primary_vtbl
))
2019 /* Ignore dummy vtables made by get_vtable_decl. */
2020 if (TREE_TYPE (primary_vtbl
) == void_type_node
)
2023 /* On some targets, we cannot determine the key method until the end
2024 of the translation unit -- which is when this function is
2026 if (!targetm
.cxx
.key_method_may_be_inline ())
2027 determine_key_method (ctype
);
2029 /* See if any of the vtables are needed. */
2030 for (vtbl
= CLASSTYPE_VTABLES (ctype
); vtbl
; vtbl
= DECL_CHAIN (vtbl
))
2032 import_export_decl (vtbl
);
2033 if (DECL_NOT_REALLY_EXTERN (vtbl
) && decl_needed_p (vtbl
))
2038 /* If the references to this class' vtables are optimized away,
2039 still emit the appropriate debugging information. See
2041 if (DECL_COMDAT (primary_vtbl
)
2042 && CLASSTYPE_DEBUG_REQUESTED (ctype
))
2043 note_debug_info_needed (ctype
);
2047 /* The ABI requires that we emit all of the vtables if we emit any
2049 for (vtbl
= CLASSTYPE_VTABLES (ctype
); vtbl
; vtbl
= DECL_CHAIN (vtbl
))
2051 /* Mark entities references from the virtual table as used. */
2052 mark_vtable_entries (vtbl
);
2054 if (TREE_TYPE (DECL_INITIAL (vtbl
)) == 0)
2056 vec
<tree
, va_gc
> *cleanups
= NULL
;
2057 tree expr
= store_init_value (vtbl
, DECL_INITIAL (vtbl
), &cleanups
,
2060 /* It had better be all done at compile-time. */
2061 gcc_assert (!expr
&& !cleanups
);
2065 DECL_EXTERNAL (vtbl
) = 0;
2066 rest_of_decl_compilation (vtbl
, 1, 1);
2068 /* Because we're only doing syntax-checking, we'll never end up
2069 actually marking the variable as written. */
2070 if (flag_syntax_only
)
2071 TREE_ASM_WRITTEN (vtbl
) = 1;
2072 else if (DECL_ONE_ONLY (vtbl
))
2074 current
= varpool_node::get_create (vtbl
);
2076 current
->add_to_same_comdat_group (last
);
2081 /* Since we're writing out the vtable here, also write the debug
2083 note_debug_info_needed (ctype
);
2088 /* A special return value from type_visibility meaning internal
2091 enum { VISIBILITY_ANON
= VISIBILITY_INTERNAL
+1 };
2093 /* walk_tree helper function for type_visibility. */
2096 min_vis_r (tree
*tp
, int *walk_subtrees
, void *data
)
2098 int *vis_p
= (int *)data
;
2103 else if (OVERLOAD_TYPE_P (*tp
)
2104 && !TREE_PUBLIC (TYPE_MAIN_DECL (*tp
)))
2106 *vis_p
= VISIBILITY_ANON
;
2109 else if (CLASS_TYPE_P (*tp
)
2110 && CLASSTYPE_VISIBILITY (*tp
) > *vis_p
)
2111 *vis_p
= CLASSTYPE_VISIBILITY (*tp
);
2115 /* Returns the visibility of TYPE, which is the minimum visibility of its
2119 type_visibility (tree type
)
2121 int vis
= VISIBILITY_DEFAULT
;
2122 cp_walk_tree_without_duplicates (&type
, min_vis_r
, &vis
);
2126 /* Limit the visibility of DECL to VISIBILITY, if not explicitly
2127 specified (or if VISIBILITY is static). If TMPL is true, this
2128 constraint is for a template argument, and takes precedence
2129 over explicitly-specified visibility on the template. */
2132 constrain_visibility (tree decl
, int visibility
, bool tmpl
)
2134 if (visibility
== VISIBILITY_ANON
)
2136 /* extern "C" declarations aren't affected by the anonymous
2138 if (!DECL_EXTERN_C_P (decl
))
2140 TREE_PUBLIC (decl
) = 0;
2141 DECL_WEAK (decl
) = 0;
2142 DECL_COMMON (decl
) = 0;
2143 DECL_COMDAT (decl
) = false;
2144 if (VAR_OR_FUNCTION_DECL_P (decl
))
2146 struct symtab_node
*snode
= symtab_node::get (decl
);
2149 snode
->set_comdat_group (NULL
);
2151 DECL_INTERFACE_KNOWN (decl
) = 1;
2152 if (DECL_LANG_SPECIFIC (decl
))
2153 DECL_NOT_REALLY_EXTERN (decl
) = 1;
2156 else if (visibility
> DECL_VISIBILITY (decl
)
2157 && (tmpl
|| !DECL_VISIBILITY_SPECIFIED (decl
)))
2159 DECL_VISIBILITY (decl
) = (enum symbol_visibility
) visibility
;
2160 /* This visibility was not specified. */
2161 DECL_VISIBILITY_SPECIFIED (decl
) = false;
2165 /* Constrain the visibility of DECL based on the visibility of its template
2169 constrain_visibility_for_template (tree decl
, tree targs
)
2171 /* If this is a template instantiation, check the innermost
2172 template args for visibility constraints. The outer template
2173 args are covered by the class check. */
2174 tree args
= INNERMOST_TEMPLATE_ARGS (targs
);
2176 for (i
= TREE_VEC_LENGTH (args
); i
> 0; --i
)
2180 tree arg
= TREE_VEC_ELT (args
, i
-1);
2182 vis
= type_visibility (arg
);
2185 if (REFERENCE_REF_P (arg
))
2186 arg
= TREE_OPERAND (arg
, 0);
2187 if (TREE_TYPE (arg
))
2189 if (TREE_CODE (arg
) == ADDR_EXPR
)
2190 arg
= TREE_OPERAND (arg
, 0);
2191 if (VAR_OR_FUNCTION_DECL_P (arg
))
2193 if (! TREE_PUBLIC (arg
))
2194 vis
= VISIBILITY_ANON
;
2196 vis
= DECL_VISIBILITY (arg
);
2200 constrain_visibility (decl
, vis
, true);
2204 /* Like c_determine_visibility, but with additional C++-specific
2207 Function-scope entities can rely on the function's visibility because
2208 it is set in start_preparsed_function.
2210 Class-scope entities cannot rely on the class's visibility until the end
2211 of the enclosing class definition.
2213 Note that because namespaces have multiple independent definitions,
2214 namespace visibility is handled elsewhere using the #pragma visibility
2215 machinery rather than by decorating the namespace declaration.
2217 The goal is for constraints from the type to give a diagnostic, and
2218 other constraints to be applied silently. */
2221 determine_visibility (tree decl
)
2223 /* Remember that all decls get VISIBILITY_DEFAULT when built. */
2225 /* Only relevant for names with external linkage. */
2226 if (!TREE_PUBLIC (decl
))
2229 /* Cloned constructors and destructors get the same visibility as
2230 the underlying function. That should be set up in
2231 maybe_clone_body. */
2232 gcc_assert (!DECL_CLONED_FUNCTION_P (decl
));
2234 bool orig_visibility_specified
= DECL_VISIBILITY_SPECIFIED (decl
);
2235 enum symbol_visibility orig_visibility
= DECL_VISIBILITY (decl
);
2237 /* The decl may be a template instantiation, which could influence
2239 tree template_decl
= NULL_TREE
;
2240 if (TREE_CODE (decl
) == TYPE_DECL
)
2242 if (CLASS_TYPE_P (TREE_TYPE (decl
)))
2244 if (CLASSTYPE_USE_TEMPLATE (TREE_TYPE (decl
)))
2245 template_decl
= decl
;
2247 else if (TYPE_TEMPLATE_INFO (TREE_TYPE (decl
)))
2248 template_decl
= decl
;
2250 else if (DECL_LANG_SPECIFIC (decl
) && DECL_USE_TEMPLATE (decl
))
2251 template_decl
= decl
;
2253 /* If DECL is a member of a class, visibility specifiers on the
2254 class can influence the visibility of the DECL. */
2255 tree class_type
= NULL_TREE
;
2256 if (DECL_CLASS_SCOPE_P (decl
))
2257 class_type
= DECL_CONTEXT (decl
);
2260 /* Not a class member. */
2262 /* Virtual tables have DECL_CONTEXT set to their associated class,
2263 so they are automatically handled above. */
2264 gcc_assert (!VAR_P (decl
)
2265 || !DECL_VTABLE_OR_VTT_P (decl
));
2267 if (DECL_FUNCTION_SCOPE_P (decl
) && ! DECL_VISIBILITY_SPECIFIED (decl
))
2269 /* Local statics and classes get the visibility of their
2270 containing function by default, except that
2271 -fvisibility-inlines-hidden doesn't affect them. */
2272 tree fn
= DECL_CONTEXT (decl
);
2273 if (DECL_VISIBILITY_SPECIFIED (fn
))
2275 DECL_VISIBILITY (decl
) = DECL_VISIBILITY (fn
);
2276 DECL_VISIBILITY_SPECIFIED (decl
) =
2277 DECL_VISIBILITY_SPECIFIED (fn
);
2281 if (DECL_CLASS_SCOPE_P (fn
))
2282 determine_visibility_from_class (decl
, DECL_CONTEXT (fn
));
2283 else if (determine_hidden_inline (fn
))
2285 DECL_VISIBILITY (decl
) = default_visibility
;
2286 DECL_VISIBILITY_SPECIFIED (decl
) =
2287 visibility_options
.inpragma
;
2291 DECL_VISIBILITY (decl
) = DECL_VISIBILITY (fn
);
2292 DECL_VISIBILITY_SPECIFIED (decl
) =
2293 DECL_VISIBILITY_SPECIFIED (fn
);
2297 /* Local classes in templates have CLASSTYPE_USE_TEMPLATE set,
2298 but have no TEMPLATE_INFO. Their containing template
2299 function does, and the local class could be constrained
2304 else if (VAR_P (decl
) && DECL_TINFO_P (decl
)
2305 && flag_visibility_ms_compat
)
2307 /* Under -fvisibility-ms-compat, types are visible by default,
2308 even though their contents aren't. */
2309 tree underlying_type
= TREE_TYPE (DECL_NAME (decl
));
2310 int underlying_vis
= type_visibility (underlying_type
);
2311 if (underlying_vis
== VISIBILITY_ANON
2312 || (CLASS_TYPE_P (underlying_type
)
2313 && CLASSTYPE_VISIBILITY_SPECIFIED (underlying_type
)))
2314 constrain_visibility (decl
, underlying_vis
, false);
2316 DECL_VISIBILITY (decl
) = VISIBILITY_DEFAULT
;
2318 else if (VAR_P (decl
) && DECL_TINFO_P (decl
))
2320 /* tinfo visibility is based on the type it's for. */
2321 constrain_visibility
2322 (decl
, type_visibility (TREE_TYPE (DECL_NAME (decl
))), false);
2324 /* Give the target a chance to override the visibility associated
2326 if (TREE_PUBLIC (decl
)
2327 && !DECL_REALLY_EXTERN (decl
)
2328 && CLASS_TYPE_P (TREE_TYPE (DECL_NAME (decl
)))
2329 && !CLASSTYPE_VISIBILITY_SPECIFIED (TREE_TYPE (DECL_NAME (decl
))))
2330 targetm
.cxx
.determine_class_data_visibility (decl
);
2332 else if (template_decl
)
2333 /* Template instantiations and specializations get visibility based
2334 on their template unless they override it with an attribute. */;
2335 else if (! DECL_VISIBILITY_SPECIFIED (decl
))
2337 if (determine_hidden_inline (decl
))
2338 DECL_VISIBILITY (decl
) = VISIBILITY_HIDDEN
;
2341 /* Set default visibility to whatever the user supplied with
2342 #pragma GCC visibility or a namespace visibility attribute. */
2343 DECL_VISIBILITY (decl
) = default_visibility
;
2344 DECL_VISIBILITY_SPECIFIED (decl
) = visibility_options
.inpragma
;
2351 /* If the specialization doesn't specify visibility, use the
2352 visibility from the template. */
2353 tree tinfo
= get_template_info (template_decl
);
2354 tree args
= TI_ARGS (tinfo
);
2355 tree attribs
= (TREE_CODE (decl
) == TYPE_DECL
2356 ? TYPE_ATTRIBUTES (TREE_TYPE (decl
))
2357 : DECL_ATTRIBUTES (decl
));
2359 if (args
!= error_mark_node
)
2361 tree pattern
= DECL_TEMPLATE_RESULT (TI_TEMPLATE (tinfo
));
2363 if (!DECL_VISIBILITY_SPECIFIED (decl
))
2365 if (!DECL_VISIBILITY_SPECIFIED (pattern
)
2366 && determine_hidden_inline (decl
))
2367 DECL_VISIBILITY (decl
) = VISIBILITY_HIDDEN
;
2370 DECL_VISIBILITY (decl
) = DECL_VISIBILITY (pattern
);
2371 DECL_VISIBILITY_SPECIFIED (decl
)
2372 = DECL_VISIBILITY_SPECIFIED (pattern
);
2377 /* Template argument visibility outweighs #pragma or namespace
2378 visibility, but not an explicit attribute. */
2379 && !lookup_attribute ("visibility", attribs
))
2381 int depth
= TMPL_ARGS_DEPTH (args
);
2382 if (DECL_VISIBILITY_SPECIFIED (decl
))
2384 /* A class template member with explicit visibility
2385 overrides the class visibility, so we need to apply
2386 all the levels of template args directly. */
2388 for (i
= 1; i
<= depth
; ++i
)
2390 tree lev
= TMPL_ARGS_LEVEL (args
, i
);
2391 constrain_visibility_for_template (decl
, lev
);
2394 else if (PRIMARY_TEMPLATE_P (TI_TEMPLATE (tinfo
)))
2395 /* Limit visibility based on its template arguments. */
2396 constrain_visibility_for_template (decl
, args
);
2402 determine_visibility_from_class (decl
, class_type
);
2404 if (decl_anon_ns_mem_p (decl
))
2405 /* Names in an anonymous namespace get internal linkage.
2406 This might change once we implement export. */
2407 constrain_visibility (decl
, VISIBILITY_ANON
, false);
2408 else if (TREE_CODE (decl
) != TYPE_DECL
)
2410 /* Propagate anonymity from type to decl. */
2411 int tvis
= type_visibility (TREE_TYPE (decl
));
2412 if (tvis
== VISIBILITY_ANON
2413 || ! DECL_VISIBILITY_SPECIFIED (decl
))
2414 constrain_visibility (decl
, tvis
, false);
2416 else if (no_linkage_check (TREE_TYPE (decl
), /*relaxed_p=*/true))
2417 /* DR 757: A type without linkage shall not be used as the type of a
2418 variable or function with linkage, unless
2419 o the variable or function has extern "C" linkage (7.5 [dcl.link]), or
2420 o the variable or function is not used (3.2 [basic.def.odr]) or is
2421 defined in the same translation unit.
2423 Since non-extern "C" decls need to be defined in the same
2424 translation unit, we can make the type internal. */
2425 constrain_visibility (decl
, VISIBILITY_ANON
, false);
2427 /* If visibility changed and DECL already has DECL_RTL, ensure
2428 symbol flags are updated. */
2429 if ((DECL_VISIBILITY (decl
) != orig_visibility
2430 || DECL_VISIBILITY_SPECIFIED (decl
) != orig_visibility_specified
)
2431 && ((VAR_P (decl
) && TREE_STATIC (decl
))
2432 || TREE_CODE (decl
) == FUNCTION_DECL
)
2433 && DECL_RTL_SET_P (decl
))
2434 make_decl_rtl (decl
);
2437 /* By default, static data members and function members receive
2438 the visibility of their containing class. */
2441 determine_visibility_from_class (tree decl
, tree class_type
)
2443 if (DECL_VISIBILITY_SPECIFIED (decl
))
2446 if (determine_hidden_inline (decl
))
2447 DECL_VISIBILITY (decl
) = VISIBILITY_HIDDEN
;
2450 /* Default to the class visibility. */
2451 DECL_VISIBILITY (decl
) = CLASSTYPE_VISIBILITY (class_type
);
2452 DECL_VISIBILITY_SPECIFIED (decl
)
2453 = CLASSTYPE_VISIBILITY_SPECIFIED (class_type
);
2456 /* Give the target a chance to override the visibility associated
2459 && (DECL_TINFO_P (decl
)
2460 || (DECL_VTABLE_OR_VTT_P (decl
)
2461 /* Construction virtual tables are not exported because
2462 they cannot be referred to from other object files;
2463 their name is not standardized by the ABI. */
2464 && !DECL_CONSTRUCTION_VTABLE_P (decl
)))
2465 && TREE_PUBLIC (decl
)
2466 && !DECL_REALLY_EXTERN (decl
)
2467 && !CLASSTYPE_VISIBILITY_SPECIFIED (class_type
))
2468 targetm
.cxx
.determine_class_data_visibility (decl
);
2471 /* Returns true iff DECL is an inline that should get hidden visibility
2472 because of -fvisibility-inlines-hidden. */
2475 determine_hidden_inline (tree decl
)
2477 return (visibility_options
.inlines_hidden
2478 /* Don't do this for inline templates; specializations might not be
2479 inline, and we don't want them to inherit the hidden
2480 visibility. We'll set it here for all inline instantiations. */
2481 && !processing_template_decl
2482 && TREE_CODE (decl
) == FUNCTION_DECL
2483 && DECL_DECLARED_INLINE_P (decl
)
2484 && (! DECL_LANG_SPECIFIC (decl
)
2485 || ! DECL_EXPLICIT_INSTANTIATION (decl
)));
2488 /* Constrain the visibility of a class TYPE based on the visibility of its
2489 field types. Warn if any fields require lesser visibility. */
2492 constrain_class_visibility (tree type
)
2498 int vis
= type_visibility (type
);
2500 if (vis
== VISIBILITY_ANON
2501 || DECL_IN_SYSTEM_HEADER (TYPE_MAIN_DECL (type
)))
2504 /* Don't warn about visibility if the class has explicit visibility. */
2505 if (CLASSTYPE_VISIBILITY_SPECIFIED (type
))
2506 vis
= VISIBILITY_INTERNAL
;
2508 for (t
= TYPE_FIELDS (type
); t
; t
= DECL_CHAIN (t
))
2509 if (TREE_CODE (t
) == FIELD_DECL
&& TREE_TYPE (t
) != error_mark_node
)
2511 tree ftype
= strip_pointer_or_array_types (TREE_TYPE (t
));
2512 int subvis
= type_visibility (ftype
);
2514 if (subvis
== VISIBILITY_ANON
)
2516 if (!in_main_input_context())
2518 tree nlt
= no_linkage_check (ftype
, /*relaxed_p=*/false);
2521 if (same_type_p (TREE_TYPE (t
), nlt
))
2522 warning (OPT_Wsubobject_linkage
, "\
2523 %qT has a field %qD whose type has no linkage",
2526 warning (OPT_Wsubobject_linkage
, "\
2527 %qT has a field %qD whose type depends on the type %qT which has no linkage",
2531 warning (OPT_Wsubobject_linkage
, "\
2532 %qT has a field %qD whose type uses the anonymous namespace",
2536 else if (MAYBE_CLASS_TYPE_P (ftype
)
2537 && vis
< VISIBILITY_HIDDEN
2538 && subvis
>= VISIBILITY_HIDDEN
)
2539 warning (OPT_Wattributes
, "\
2540 %qT declared with greater visibility than the type of its field %qD",
2544 binfo
= TYPE_BINFO (type
);
2545 for (i
= 0; BINFO_BASE_ITERATE (binfo
, i
, t
); ++i
)
2547 int subvis
= type_visibility (TREE_TYPE (t
));
2549 if (subvis
== VISIBILITY_ANON
)
2551 if (!in_main_input_context())
2553 tree nlt
= no_linkage_check (TREE_TYPE (t
), /*relaxed_p=*/false);
2556 if (same_type_p (TREE_TYPE (t
), nlt
))
2557 warning (OPT_Wsubobject_linkage
, "\
2558 %qT has a base %qT whose type has no linkage",
2559 type
, TREE_TYPE (t
));
2561 warning (OPT_Wsubobject_linkage
, "\
2562 %qT has a base %qT whose type depends on the type %qT which has no linkage",
2563 type
, TREE_TYPE (t
), nlt
);
2566 warning (OPT_Wsubobject_linkage
, "\
2567 %qT has a base %qT whose type uses the anonymous namespace",
2568 type
, TREE_TYPE (t
));
2571 else if (vis
< VISIBILITY_HIDDEN
2572 && subvis
>= VISIBILITY_HIDDEN
)
2573 warning (OPT_Wattributes
, "\
2574 %qT declared with greater visibility than its base %qT",
2575 type
, TREE_TYPE (t
));
2579 /* Functions for adjusting the visibility of a tagged type and its nested
2580 types and declarations when it gets a name for linkage purposes from a
2583 static void bt_reset_linkage_1 (binding_entry
, void *);
2584 static void bt_reset_linkage_2 (binding_entry
, void *);
2586 /* First reset the visibility of all the types. */
2589 reset_type_linkage_1 (tree type
)
2591 set_linkage_according_to_type (type
, TYPE_MAIN_DECL (type
));
2592 if (CLASS_TYPE_P (type
))
2593 binding_table_foreach (CLASSTYPE_NESTED_UTDS (type
),
2594 bt_reset_linkage_1
, NULL
);
2597 bt_reset_linkage_1 (binding_entry b
, void */
*data*/
)
2599 reset_type_linkage_1 (b
->type
);
2602 /* Then reset the visibility of any static data members or member
2603 functions that use those types. */
2606 reset_decl_linkage (tree decl
)
2608 if (TREE_PUBLIC (decl
))
2610 if (DECL_CLONED_FUNCTION_P (decl
))
2612 TREE_PUBLIC (decl
) = true;
2613 DECL_INTERFACE_KNOWN (decl
) = false;
2614 determine_visibility (decl
);
2615 tentative_decl_linkage (decl
);
2618 reset_type_linkage_2 (tree type
)
2620 if (CLASS_TYPE_P (type
))
2622 if (tree vt
= CLASSTYPE_VTABLES (type
))
2624 tree name
= mangle_vtbl_for_type (type
);
2625 DECL_NAME (vt
) = name
;
2626 SET_DECL_ASSEMBLER_NAME (vt
, name
);
2627 reset_decl_linkage (vt
);
2629 if (tree ti
= CLASSTYPE_TYPEINFO_VAR (type
))
2631 tree name
= mangle_typeinfo_for_type (type
);
2632 DECL_NAME (ti
) = name
;
2633 SET_DECL_ASSEMBLER_NAME (ti
, name
);
2634 TREE_TYPE (name
) = type
;
2635 reset_decl_linkage (ti
);
2637 for (tree m
= TYPE_FIELDS (type
); m
; m
= DECL_CHAIN (m
))
2639 tree mem
= STRIP_TEMPLATE (m
);
2641 reset_decl_linkage (mem
);
2643 for (tree m
= TYPE_METHODS (type
); m
; m
= DECL_CHAIN (m
))
2645 tree mem
= STRIP_TEMPLATE (m
);
2646 reset_decl_linkage (mem
);
2647 if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (mem
))
2649 /* Also update its name, for cxx_dwarf_name. */
2650 DECL_NAME (mem
) = TYPE_IDENTIFIER (type
);
2652 DECL_NAME (m
) = TYPE_IDENTIFIER (type
);
2655 binding_table_foreach (CLASSTYPE_NESTED_UTDS (type
),
2656 bt_reset_linkage_2
, NULL
);
2660 bt_reset_linkage_2 (binding_entry b
, void */
*data*/
)
2662 reset_type_linkage_2 (b
->type
);
2665 reset_type_linkage (tree type
)
2667 reset_type_linkage_1 (type
);
2668 reset_type_linkage_2 (type
);
2671 /* Set up our initial idea of what the linkage of DECL should be. */
2674 tentative_decl_linkage (tree decl
)
2676 if (DECL_INTERFACE_KNOWN (decl
))
2677 /* We've already made a decision as to how this function will
2679 else if (vague_linkage_p (decl
))
2681 if (TREE_CODE (decl
) == FUNCTION_DECL
2682 && decl_defined_p (decl
))
2684 DECL_EXTERNAL (decl
) = 1;
2685 DECL_NOT_REALLY_EXTERN (decl
) = 1;
2686 note_vague_linkage_fn (decl
);
2687 /* A non-template inline function with external linkage will
2688 always be COMDAT. As we must eventually determine the
2689 linkage of all functions, and as that causes writes to
2690 the data mapped in from the PCH file, it's advantageous
2691 to mark the functions at this point. */
2692 if (DECL_DECLARED_INLINE_P (decl
)
2693 && (!DECL_IMPLICIT_INSTANTIATION (decl
)
2694 || DECL_DEFAULTED_FN (decl
)))
2696 /* This function must have external linkage, as
2697 otherwise DECL_INTERFACE_KNOWN would have been
2699 gcc_assert (TREE_PUBLIC (decl
));
2700 comdat_linkage (decl
);
2701 DECL_INTERFACE_KNOWN (decl
) = 1;
2704 else if (VAR_P (decl
))
2705 maybe_commonize_var (decl
);
2709 /* DECL is a FUNCTION_DECL or VAR_DECL. If the object file linkage
2710 for DECL has not already been determined, do so now by setting
2711 DECL_EXTERNAL, DECL_COMDAT and other related flags. Until this
2712 function is called entities with vague linkage whose definitions
2713 are available must have TREE_PUBLIC set.
2715 If this function decides to place DECL in COMDAT, it will set
2716 appropriate flags -- but will not clear DECL_EXTERNAL. It is up to
2717 the caller to decide whether or not to clear DECL_EXTERNAL. Some
2718 callers defer that decision until it is clear that DECL is actually
2722 import_export_decl (tree decl
)
2727 tree class_type
= NULL_TREE
;
2729 if (DECL_INTERFACE_KNOWN (decl
))
2732 /* We cannot determine what linkage to give to an entity with vague
2733 linkage until the end of the file. For example, a virtual table
2734 for a class will be defined if and only if the key method is
2735 defined in this translation unit. As a further example, consider
2736 that when compiling a translation unit that uses PCH file with
2737 "-frepo" it would be incorrect to make decisions about what
2738 entities to emit when building the PCH; those decisions must be
2739 delayed until the repository information has been processed. */
2740 gcc_assert (at_eof
);
2741 /* Object file linkage for explicit instantiations is handled in
2742 mark_decl_instantiated. For static variables in functions with
2743 vague linkage, maybe_commonize_var is used.
2745 Therefore, the only declarations that should be provided to this
2746 function are those with external linkage that are:
2748 * implicit instantiations of function templates
2752 * implicit instantiations of static data members of class
2759 Furthermore, all entities that reach this point must have a
2760 definition available in this translation unit.
2762 The following assertions check these conditions. */
2763 gcc_assert (VAR_OR_FUNCTION_DECL_P (decl
));
2764 /* Any code that creates entities with TREE_PUBLIC cleared should
2765 also set DECL_INTERFACE_KNOWN. */
2766 gcc_assert (TREE_PUBLIC (decl
));
2767 if (TREE_CODE (decl
) == FUNCTION_DECL
)
2768 gcc_assert (DECL_IMPLICIT_INSTANTIATION (decl
)
2769 || DECL_FRIEND_PSEUDO_TEMPLATE_INSTANTIATION (decl
)
2770 || DECL_DECLARED_INLINE_P (decl
));
2772 gcc_assert (DECL_IMPLICIT_INSTANTIATION (decl
)
2773 || DECL_VTABLE_OR_VTT_P (decl
)
2774 || DECL_TINFO_P (decl
));
2775 /* Check that a definition of DECL is available in this translation
2777 gcc_assert (!DECL_REALLY_EXTERN (decl
));
2779 /* Assume that DECL will not have COMDAT linkage. */
2781 /* Assume that DECL will not be imported into this translation
2785 /* See if the repository tells us whether or not to emit DECL in
2786 this translation unit. */
2787 emit_p
= repo_emit_p (decl
);
2790 else if (emit_p
== 1)
2792 /* The repository indicates that this entity should be defined
2793 here. Make sure the back end honors that request. */
2795 /* Output the definition as an ordinary strong definition. */
2796 DECL_EXTERNAL (decl
) = 0;
2797 DECL_INTERFACE_KNOWN (decl
) = 1;
2802 /* We have already decided what to do with this DECL; there is no
2803 need to check anything further. */
2805 else if (VAR_P (decl
) && DECL_VTABLE_OR_VTT_P (decl
))
2807 class_type
= DECL_CONTEXT (decl
);
2808 import_export_class (class_type
);
2809 if (CLASSTYPE_INTERFACE_KNOWN (class_type
)
2810 && CLASSTYPE_INTERFACE_ONLY (class_type
))
2812 else if ((!flag_weak
|| TARGET_WEAK_NOT_IN_ARCHIVE_TOC
)
2813 && !CLASSTYPE_USE_TEMPLATE (class_type
)
2814 && CLASSTYPE_KEY_METHOD (class_type
)
2815 && !DECL_DECLARED_INLINE_P (CLASSTYPE_KEY_METHOD (class_type
)))
2816 /* The ABI requires that all virtual tables be emitted with
2817 COMDAT linkage. However, on systems where COMDAT symbols
2818 don't show up in the table of contents for a static
2819 archive, or on systems without weak symbols (where we
2820 approximate COMDAT linkage by using internal linkage), the
2821 linker will report errors about undefined symbols because
2822 it will not see the virtual table definition. Therefore,
2823 in the case that we know that the virtual table will be
2824 emitted in only one translation unit, we make the virtual
2825 table an ordinary definition with external linkage. */
2826 DECL_EXTERNAL (decl
) = 0;
2827 else if (CLASSTYPE_INTERFACE_KNOWN (class_type
))
2829 /* CLASS_TYPE is being exported from this translation unit,
2830 so DECL should be defined here. */
2831 if (!flag_weak
&& CLASSTYPE_EXPLICIT_INSTANTIATION (class_type
))
2832 /* If a class is declared in a header with the "extern
2833 template" extension, then it will not be instantiated,
2834 even in translation units that would normally require
2835 it. Often such classes are explicitly instantiated in
2836 one translation unit. Therefore, the explicit
2837 instantiation must be made visible to other translation
2839 DECL_EXTERNAL (decl
) = 0;
2842 /* The generic C++ ABI says that class data is always
2843 COMDAT, even if there is a key function. Some
2844 variants (e.g., the ARM EABI) says that class data
2845 only has COMDAT linkage if the class data might be
2846 emitted in more than one translation unit. When the
2847 key method can be inline and is inline, we still have
2848 to arrange for comdat even though
2849 class_data_always_comdat is false. */
2850 if (!CLASSTYPE_KEY_METHOD (class_type
)
2851 || DECL_DECLARED_INLINE_P (CLASSTYPE_KEY_METHOD (class_type
))
2852 || targetm
.cxx
.class_data_always_comdat ())
2854 /* The ABI requires COMDAT linkage. Normally, we
2855 only emit COMDAT things when they are needed;
2856 make sure that we realize that this entity is
2863 else if (!flag_implicit_templates
2864 && CLASSTYPE_IMPLICIT_INSTANTIATION (class_type
))
2869 else if (VAR_P (decl
) && DECL_TINFO_P (decl
))
2871 tree type
= TREE_TYPE (DECL_NAME (decl
));
2872 if (CLASS_TYPE_P (type
))
2875 import_export_class (type
);
2876 if (CLASSTYPE_INTERFACE_KNOWN (type
)
2877 && TYPE_POLYMORPHIC_P (type
)
2878 && CLASSTYPE_INTERFACE_ONLY (type
)
2879 /* If -fno-rtti was specified, then we cannot be sure
2880 that RTTI information will be emitted with the
2881 virtual table of the class, so we must emit it
2882 wherever it is used. */
2887 if (CLASSTYPE_INTERFACE_KNOWN (type
)
2888 && !CLASSTYPE_INTERFACE_ONLY (type
))
2890 comdat_p
= (targetm
.cxx
.class_data_always_comdat ()
2891 || (CLASSTYPE_KEY_METHOD (type
)
2892 && DECL_DECLARED_INLINE_P (CLASSTYPE_KEY_METHOD (type
))));
2897 DECL_EXTERNAL (decl
) = 0;
2907 else if (DECL_TEMPLOID_INSTANTIATION (decl
))
2909 /* DECL is an implicit instantiation of a function or static
2911 if ((flag_implicit_templates
2912 && !flag_use_repository
)
2913 || (flag_implicit_inline_templates
2914 && TREE_CODE (decl
) == FUNCTION_DECL
2915 && DECL_DECLARED_INLINE_P (decl
)))
2918 /* If we are not implicitly generating templates, then mark
2919 this entity as undefined in this translation unit. */
2922 else if (DECL_FUNCTION_MEMBER_P (decl
))
2924 if (!DECL_DECLARED_INLINE_P (decl
))
2926 tree ctype
= DECL_CONTEXT (decl
);
2927 import_export_class (ctype
);
2928 if (CLASSTYPE_INTERFACE_KNOWN (ctype
))
2930 DECL_NOT_REALLY_EXTERN (decl
)
2931 = ! (CLASSTYPE_INTERFACE_ONLY (ctype
)
2932 || (DECL_DECLARED_INLINE_P (decl
)
2933 && ! flag_implement_inlines
2934 && !DECL_VINDEX (decl
)));
2936 if (!DECL_NOT_REALLY_EXTERN (decl
))
2937 DECL_EXTERNAL (decl
) = 1;
2939 /* Always make artificials weak. */
2940 if (DECL_ARTIFICIAL (decl
) && flag_weak
)
2943 maybe_make_one_only (decl
);
2954 /* If we are importing DECL into this translation unit, mark is
2955 an undefined here. */
2956 DECL_EXTERNAL (decl
) = 1;
2957 DECL_NOT_REALLY_EXTERN (decl
) = 0;
2961 /* If we decided to put DECL in COMDAT, mark it accordingly at
2963 comdat_linkage (decl
);
2966 DECL_INTERFACE_KNOWN (decl
) = 1;
2969 /* Return an expression that performs the destruction of DECL, which
2970 must be a VAR_DECL whose type has a non-trivial destructor, or is
2971 an array whose (innermost) elements have a non-trivial destructor. */
2974 build_cleanup (tree decl
)
2976 tree clean
= cxx_maybe_build_cleanup (decl
, tf_warning_or_error
);
2977 gcc_assert (clean
!= NULL_TREE
);
2981 /* Returns the initialization guard variable for the variable DECL,
2982 which has static storage duration. */
2985 get_guard (tree decl
)
2990 sname
= mangle_guard_variable (decl
);
2991 guard
= IDENTIFIER_GLOBAL_VALUE (sname
);
2996 /* We use a type that is big enough to contain a mutex as well
2997 as an integer counter. */
2998 guard_type
= targetm
.cxx
.guard_type ();
2999 guard
= build_decl (DECL_SOURCE_LOCATION (decl
),
3000 VAR_DECL
, sname
, guard_type
);
3002 /* The guard should have the same linkage as what it guards. */
3003 TREE_PUBLIC (guard
) = TREE_PUBLIC (decl
);
3004 TREE_STATIC (guard
) = TREE_STATIC (decl
);
3005 DECL_COMMON (guard
) = DECL_COMMON (decl
);
3006 DECL_COMDAT (guard
) = DECL_COMDAT (decl
);
3007 CP_DECL_THREAD_LOCAL_P (guard
) = CP_DECL_THREAD_LOCAL_P (decl
);
3008 set_decl_tls_model (guard
, DECL_TLS_MODEL (decl
));
3009 if (DECL_ONE_ONLY (decl
))
3010 make_decl_one_only (guard
, cxx_comdat_group (guard
));
3011 if (TREE_PUBLIC (decl
))
3012 DECL_WEAK (guard
) = DECL_WEAK (decl
);
3013 DECL_VISIBILITY (guard
) = DECL_VISIBILITY (decl
);
3014 DECL_VISIBILITY_SPECIFIED (guard
) = DECL_VISIBILITY_SPECIFIED (decl
);
3016 DECL_ARTIFICIAL (guard
) = 1;
3017 DECL_IGNORED_P (guard
) = 1;
3018 TREE_USED (guard
) = 1;
3019 pushdecl_top_level_and_finish (guard
, NULL_TREE
);
3024 /* Return an atomic load of src with the appropriate memory model. */
3027 build_atomic_load_byte (tree src
, HOST_WIDE_INT model
)
3029 tree ptr_type
= build_pointer_type (char_type_node
);
3030 tree mem_model
= build_int_cst (integer_type_node
, model
);
3035 size
= tree_to_uhwi (TYPE_SIZE_UNIT (char_type_node
));
3037 fncode
= BUILT_IN_ATOMIC_LOAD_N
+ exact_log2 (size
) + 1;
3038 t
= builtin_decl_implicit ((enum built_in_function
) fncode
);
3040 addr
= build1 (ADDR_EXPR
, ptr_type
, src
);
3041 val
= build_call_expr (t
, 2, addr
, mem_model
);
3045 /* Return those bits of the GUARD variable that should be set when the
3046 guarded entity is actually initialized. */
3049 get_guard_bits (tree guard
)
3051 if (!targetm
.cxx
.guard_mask_bit ())
3053 /* We only set the first byte of the guard, in order to leave room
3054 for a mutex in the high-order bits. */
3055 guard
= build1 (ADDR_EXPR
,
3056 build_pointer_type (TREE_TYPE (guard
)),
3058 guard
= build1 (NOP_EXPR
,
3059 build_pointer_type (char_type_node
),
3061 guard
= build1 (INDIRECT_REF
, char_type_node
, guard
);
3067 /* Return an expression which determines whether or not the GUARD
3068 variable has already been initialized. */
3071 get_guard_cond (tree guard
, bool thread_safe
)
3076 guard
= get_guard_bits (guard
);
3078 guard
= build_atomic_load_byte (guard
, MEMMODEL_ACQUIRE
);
3080 /* Mask off all but the low bit. */
3081 if (targetm
.cxx
.guard_mask_bit ())
3083 guard_value
= integer_one_node
;
3084 if (!same_type_p (TREE_TYPE (guard_value
), TREE_TYPE (guard
)))
3085 guard_value
= fold_convert (TREE_TYPE (guard
), guard_value
);
3086 guard
= cp_build_binary_op (input_location
,
3087 BIT_AND_EXPR
, guard
, guard_value
,
3088 tf_warning_or_error
);
3091 guard_value
= integer_zero_node
;
3092 if (!same_type_p (TREE_TYPE (guard_value
), TREE_TYPE (guard
)))
3093 guard_value
= fold_convert (TREE_TYPE (guard
), guard_value
);
3094 return cp_build_binary_op (input_location
,
3095 EQ_EXPR
, guard
, guard_value
,
3096 tf_warning_or_error
);
3099 /* Return an expression which sets the GUARD variable, indicating that
3100 the variable being guarded has been initialized. */
3103 set_guard (tree guard
)
3107 /* Set the GUARD to one. */
3108 guard
= get_guard_bits (guard
);
3109 guard_init
= integer_one_node
;
3110 if (!same_type_p (TREE_TYPE (guard_init
), TREE_TYPE (guard
)))
3111 guard_init
= fold_convert (TREE_TYPE (guard
), guard_init
);
3112 return cp_build_modify_expr (input_location
, guard
, NOP_EXPR
, guard_init
,
3113 tf_warning_or_error
);
3116 /* Returns true iff we can tell that VAR does not have a dynamic
3120 var_defined_without_dynamic_init (tree var
)
3122 /* If it's defined in another TU, we can't tell. */
3123 if (DECL_EXTERNAL (var
))
3125 /* If it has a non-trivial destructor, registering the destructor
3126 counts as dynamic initialization. */
3127 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (TREE_TYPE (var
)))
3129 /* If it's in this TU, its initializer has been processed, unless
3130 it's a case of self-initialization, then DECL_INITIALIZED_P is
3131 false while the initializer is handled by finish_id_expression. */
3132 if (!DECL_INITIALIZED_P (var
))
3134 /* If it has no initializer or a constant one, it's not dynamic. */
3135 return (!DECL_NONTRIVIALLY_INITIALIZED_P (var
)
3136 || DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (var
));
3139 /* Returns true iff VAR is a variable that needs uses to be
3140 wrapped for possible dynamic initialization. */
3143 var_needs_tls_wrapper (tree var
)
3145 return (!error_operand_p (var
)
3146 && CP_DECL_THREAD_LOCAL_P (var
)
3147 && !DECL_GNU_TLS_P (var
)
3148 && !DECL_FUNCTION_SCOPE_P (var
)
3149 && !var_defined_without_dynamic_init (var
));
3152 /* Get the FUNCTION_DECL for the shared TLS init function for this
3153 translation unit. */
3156 get_local_tls_init_fn (void)
3158 tree sname
= get_identifier ("__tls_init");
3159 tree fn
= IDENTIFIER_GLOBAL_VALUE (sname
);
3162 fn
= build_lang_decl (FUNCTION_DECL
, sname
,
3163 build_function_type (void_type_node
,
3165 SET_DECL_LANGUAGE (fn
, lang_c
);
3166 TREE_PUBLIC (fn
) = false;
3167 DECL_ARTIFICIAL (fn
) = true;
3169 SET_IDENTIFIER_GLOBAL_VALUE (sname
, fn
);
3174 /* Get a FUNCTION_DECL for the init function for the thread_local
3175 variable VAR. The init function will be an alias to the function
3176 that initializes all the non-local TLS variables in the translation
3177 unit. The init function is only used by the wrapper function. */
3180 get_tls_init_fn (tree var
)
3182 /* Only C++11 TLS vars need this init fn. */
3183 if (!var_needs_tls_wrapper (var
))
3186 /* If -fno-extern-tls-init, assume that we don't need to call
3187 a tls init function for a variable defined in another TU. */
3188 if (!flag_extern_tls_init
&& DECL_EXTERNAL (var
))
3191 #ifdef ASM_OUTPUT_DEF
3192 /* If the variable is internal, or if we can't generate aliases,
3193 call the local init function directly. */
3194 if (!TREE_PUBLIC (var
))
3196 return get_local_tls_init_fn ();
3198 tree sname
= mangle_tls_init_fn (var
);
3199 tree fn
= IDENTIFIER_GLOBAL_VALUE (sname
);
3202 fn
= build_lang_decl (FUNCTION_DECL
, sname
,
3203 build_function_type (void_type_node
,
3205 SET_DECL_LANGUAGE (fn
, lang_c
);
3206 TREE_PUBLIC (fn
) = TREE_PUBLIC (var
);
3207 DECL_ARTIFICIAL (fn
) = true;
3208 DECL_COMDAT (fn
) = DECL_COMDAT (var
);
3209 DECL_EXTERNAL (fn
) = DECL_EXTERNAL (var
);
3210 if (DECL_ONE_ONLY (var
))
3211 make_decl_one_only (fn
, cxx_comdat_group (fn
));
3212 if (TREE_PUBLIC (var
))
3214 tree obtype
= strip_array_types (non_reference (TREE_TYPE (var
)));
3215 /* If the variable is defined somewhere else and might have static
3216 initialization, make the init function a weak reference. */
3217 if ((!TYPE_NEEDS_CONSTRUCTING (obtype
)
3218 || TYPE_HAS_CONSTEXPR_CTOR (obtype
))
3219 && TYPE_HAS_TRIVIAL_DESTRUCTOR (obtype
)
3220 && DECL_EXTERNAL (var
))
3223 DECL_WEAK (fn
) = DECL_WEAK (var
);
3225 DECL_VISIBILITY (fn
) = DECL_VISIBILITY (var
);
3226 DECL_VISIBILITY_SPECIFIED (fn
) = DECL_VISIBILITY_SPECIFIED (var
);
3227 DECL_DLLIMPORT_P (fn
) = DECL_DLLIMPORT_P (var
);
3228 DECL_IGNORED_P (fn
) = 1;
3231 DECL_BEFRIENDING_CLASSES (fn
) = var
;
3233 SET_IDENTIFIER_GLOBAL_VALUE (sname
, fn
);
3238 /* Get a FUNCTION_DECL for the init wrapper function for the thread_local
3239 variable VAR. The wrapper function calls the init function (if any) for
3240 VAR and then returns a reference to VAR. The wrapper function is used
3241 in place of VAR everywhere VAR is mentioned. */
3244 get_tls_wrapper_fn (tree var
)
3246 /* Only C++11 TLS vars need this wrapper fn. */
3247 if (!var_needs_tls_wrapper (var
))
3250 tree sname
= mangle_tls_wrapper_fn (var
);
3251 tree fn
= IDENTIFIER_GLOBAL_VALUE (sname
);
3254 /* A named rvalue reference is an lvalue, so the wrapper should
3255 always return an lvalue reference. */
3256 tree type
= non_reference (TREE_TYPE (var
));
3257 type
= build_reference_type (type
);
3258 tree fntype
= build_function_type (type
, void_list_node
);
3259 fn
= build_lang_decl (FUNCTION_DECL
, sname
, fntype
);
3260 SET_DECL_LANGUAGE (fn
, lang_c
);
3261 TREE_PUBLIC (fn
) = TREE_PUBLIC (var
);
3262 DECL_ARTIFICIAL (fn
) = true;
3263 DECL_IGNORED_P (fn
) = 1;
3264 /* The wrapper is inline and emitted everywhere var is used. */
3265 DECL_DECLARED_INLINE_P (fn
) = true;
3266 if (TREE_PUBLIC (var
))
3268 comdat_linkage (fn
);
3269 #ifdef HAVE_GAS_HIDDEN
3270 /* Make the wrapper bind locally; there's no reason to share
3271 the wrapper between multiple shared objects. */
3272 DECL_VISIBILITY (fn
) = VISIBILITY_INTERNAL
;
3273 DECL_VISIBILITY_SPECIFIED (fn
) = true;
3276 if (!TREE_PUBLIC (fn
))
3277 DECL_INTERFACE_KNOWN (fn
) = true;
3279 note_vague_linkage_fn (fn
);
3282 /* We want CSE to commonize calls to the wrapper, but marking it as
3283 pure is unsafe since it has side-effects. I guess we need a new
3284 ECF flag even weaker than ECF_PURE. FIXME! */
3285 DECL_PURE_P (fn
) = true;
3288 DECL_BEFRIENDING_CLASSES (fn
) = var
;
3290 SET_IDENTIFIER_GLOBAL_VALUE (sname
, fn
);
3295 /* At EOF, generate the definition for the TLS wrapper function FN:
3298 if (init_fn) init_fn();
3303 generate_tls_wrapper (tree fn
)
3305 tree var
= DECL_BEFRIENDING_CLASSES (fn
);
3307 start_preparsed_function (fn
, NULL_TREE
, SF_DEFAULT
| SF_PRE_PARSED
);
3308 tree body
= begin_function_body ();
3309 /* Only call the init fn if there might be one. */
3310 if (tree init_fn
= get_tls_init_fn (var
))
3312 tree if_stmt
= NULL_TREE
;
3313 /* If init_fn is a weakref, make sure it exists before calling. */
3314 if (lookup_attribute ("weak", DECL_ATTRIBUTES (init_fn
)))
3316 if_stmt
= begin_if_stmt ();
3317 tree addr
= cp_build_addr_expr (init_fn
, tf_warning_or_error
);
3318 tree cond
= cp_build_binary_op (DECL_SOURCE_LOCATION (var
),
3319 NE_EXPR
, addr
, nullptr_node
,
3320 tf_warning_or_error
);
3321 finish_if_stmt_cond (cond
, if_stmt
);
3323 finish_expr_stmt (build_cxx_call
3324 (init_fn
, 0, NULL
, tf_warning_or_error
));
3327 finish_then_clause (if_stmt
);
3328 finish_if_stmt (if_stmt
);
3332 /* If there's no initialization, the wrapper is a constant function. */
3333 TREE_READONLY (fn
) = true;
3334 finish_return_stmt (convert_from_reference (var
));
3335 finish_function_body (body
);
3336 expand_or_defer_fn (finish_function (0));
3339 /* Start the process of running a particular set of global constructors
3340 or destructors. Subroutine of do_[cd]tors. Also called from
3341 vtv_start_verification_constructor_init_function. */
3344 start_objects (int method_type
, int initp
)
3350 /* Make ctor or dtor function. METHOD_TYPE may be 'I' or 'D'. */
3352 if (initp
!= DEFAULT_INIT_PRIORITY
)
3362 sprintf (type
, "sub_%c%c%.5u", method_type
, joiner
, initp
);
3365 sprintf (type
, "sub_%c", method_type
);
3367 fndecl
= build_lang_decl (FUNCTION_DECL
,
3368 get_file_function_name (type
),
3369 build_function_type_list (void_type_node
,
3371 start_preparsed_function (fndecl
, /*attrs=*/NULL_TREE
, SF_PRE_PARSED
);
3373 TREE_PUBLIC (current_function_decl
) = 0;
3375 /* Mark as artificial because it's not explicitly in the user's
3377 DECL_ARTIFICIAL (current_function_decl
) = 1;
3379 /* Mark this declaration as used to avoid spurious warnings. */
3380 TREE_USED (current_function_decl
) = 1;
3382 /* Mark this function as a global constructor or destructor. */
3383 if (method_type
== 'I')
3384 DECL_GLOBAL_CTOR_P (current_function_decl
) = 1;
3386 DECL_GLOBAL_DTOR_P (current_function_decl
) = 1;
3388 body
= begin_compound_stmt (BCS_FN_BODY
);
3393 /* Finish the process of running a particular set of global constructors
3394 or destructors. Subroutine of do_[cd]tors. */
3397 finish_objects (int method_type
, int initp
, tree body
)
3402 finish_compound_stmt (body
);
3403 fn
= finish_function (0);
3405 if (method_type
== 'I')
3407 DECL_STATIC_CONSTRUCTOR (fn
) = 1;
3408 decl_init_priority_insert (fn
, initp
);
3412 DECL_STATIC_DESTRUCTOR (fn
) = 1;
3413 decl_fini_priority_insert (fn
, initp
);
3416 expand_or_defer_fn (fn
);
3419 /* The names of the parameters to the function created to handle
3420 initializations and destructions for objects with static storage
3422 #define INITIALIZE_P_IDENTIFIER "__initialize_p"
3423 #define PRIORITY_IDENTIFIER "__priority"
3425 /* The name of the function we create to handle initializations and
3426 destructions for objects with static storage duration. */
3427 #define SSDF_IDENTIFIER "__static_initialization_and_destruction"
3429 /* The declaration for the __INITIALIZE_P argument. */
3430 static GTY(()) tree initialize_p_decl
;
3432 /* The declaration for the __PRIORITY argument. */
3433 static GTY(()) tree priority_decl
;
3435 /* The declaration for the static storage duration function. */
3436 static GTY(()) tree ssdf_decl
;
3438 /* All the static storage duration functions created in this
3439 translation unit. */
3440 static GTY(()) vec
<tree
, va_gc
> *ssdf_decls
;
3442 /* A map from priority levels to information about that priority
3443 level. There may be many such levels, so efficient lookup is
3445 static splay_tree priority_info_map
;
3447 /* Begins the generation of the function that will handle all
3448 initialization and destruction of objects with static storage
3449 duration. The function generated takes two parameters of type
3450 `int': __INITIALIZE_P and __PRIORITY. If __INITIALIZE_P is
3451 nonzero, it performs initializations. Otherwise, it performs
3452 destructions. It only performs those initializations or
3453 destructions with the indicated __PRIORITY. The generated function
3456 It is assumed that this function will only be called once per
3457 translation unit. */
3460 start_static_storage_duration_function (unsigned count
)
3464 char id
[sizeof (SSDF_IDENTIFIER
) + 1 /* '\0' */ + 32];
3466 /* Create the identifier for this function. It will be of the form
3467 SSDF_IDENTIFIER_<number>. */
3468 sprintf (id
, "%s_%u", SSDF_IDENTIFIER
, count
);
3470 type
= build_function_type_list (void_type_node
,
3471 integer_type_node
, integer_type_node
,
3474 /* Create the FUNCTION_DECL itself. */
3475 ssdf_decl
= build_lang_decl (FUNCTION_DECL
,
3476 get_identifier (id
),
3478 TREE_PUBLIC (ssdf_decl
) = 0;
3479 DECL_ARTIFICIAL (ssdf_decl
) = 1;
3481 /* Put this function in the list of functions to be called from the
3482 static constructors and destructors. */
3485 vec_alloc (ssdf_decls
, 32);
3487 /* Take this opportunity to initialize the map from priority
3488 numbers to information about that priority level. */
3489 priority_info_map
= splay_tree_new (splay_tree_compare_ints
,
3490 /*delete_key_fn=*/0,
3491 /*delete_value_fn=*/
3492 (splay_tree_delete_value_fn
) &free
);
3494 /* We always need to generate functions for the
3495 DEFAULT_INIT_PRIORITY so enter it now. That way when we walk
3496 priorities later, we'll be sure to find the
3497 DEFAULT_INIT_PRIORITY. */
3498 get_priority_info (DEFAULT_INIT_PRIORITY
);
3501 vec_safe_push (ssdf_decls
, ssdf_decl
);
3503 /* Create the argument list. */
3504 initialize_p_decl
= cp_build_parm_decl
3505 (get_identifier (INITIALIZE_P_IDENTIFIER
), integer_type_node
);
3506 DECL_CONTEXT (initialize_p_decl
) = ssdf_decl
;
3507 TREE_USED (initialize_p_decl
) = 1;
3508 priority_decl
= cp_build_parm_decl
3509 (get_identifier (PRIORITY_IDENTIFIER
), integer_type_node
);
3510 DECL_CONTEXT (priority_decl
) = ssdf_decl
;
3511 TREE_USED (priority_decl
) = 1;
3513 DECL_CHAIN (initialize_p_decl
) = priority_decl
;
3514 DECL_ARGUMENTS (ssdf_decl
) = initialize_p_decl
;
3516 /* Put the function in the global scope. */
3517 pushdecl (ssdf_decl
);
3519 /* Start the function itself. This is equivalent to declaring the
3522 static void __ssdf (int __initialize_p, init __priority_p);
3524 It is static because we only need to call this function from the
3525 various constructor and destructor functions for this module. */
3526 start_preparsed_function (ssdf_decl
,
3527 /*attrs=*/NULL_TREE
,
3530 /* Set up the scope of the outermost block in the function. */
3531 body
= begin_compound_stmt (BCS_FN_BODY
);
3536 /* Finish the generation of the function which performs initialization
3537 and destruction of objects with static storage duration. After
3538 this point, no more such objects can be created. */
3541 finish_static_storage_duration_function (tree body
)
3543 /* Close out the function. */
3544 finish_compound_stmt (body
);
3545 expand_or_defer_fn (finish_function (0));
3548 /* Return the information about the indicated PRIORITY level. If no
3549 code to handle this level has yet been generated, generate the
3550 appropriate prologue. */
3552 static priority_info
3553 get_priority_info (int priority
)
3558 n
= splay_tree_lookup (priority_info_map
,
3559 (splay_tree_key
) priority
);
3562 /* Create a new priority information structure, and insert it
3564 pi
= XNEW (struct priority_info_s
);
3565 pi
->initializations_p
= 0;
3566 pi
->destructions_p
= 0;
3567 splay_tree_insert (priority_info_map
,
3568 (splay_tree_key
) priority
,
3569 (splay_tree_value
) pi
);
3572 pi
= (priority_info
) n
->value
;
3577 /* The effective initialization priority of a DECL. */
3579 #define DECL_EFFECTIVE_INIT_PRIORITY(decl) \
3580 ((!DECL_HAS_INIT_PRIORITY_P (decl) || DECL_INIT_PRIORITY (decl) == 0) \
3581 ? DEFAULT_INIT_PRIORITY : DECL_INIT_PRIORITY (decl))
3583 /* Whether a DECL needs a guard to protect it against multiple
3586 #define NEEDS_GUARD_P(decl) (TREE_PUBLIC (decl) && (DECL_COMMON (decl) \
3587 || DECL_ONE_ONLY (decl) \
3588 || DECL_WEAK (decl)))
3590 /* Called from one_static_initialization_or_destruction(),
3592 Walks the initializer list of a global variable and looks for
3593 temporary variables (DECL_NAME() == NULL and DECL_ARTIFICIAL != 0)
3594 and that have their DECL_CONTEXT() == NULL.
3595 For each such temporary variable, set their DECL_CONTEXT() to
3596 the current function. This is necessary because otherwise
3597 some optimizers (enabled by -O2 -fprofile-arcs) might crash
3598 when trying to refer to a temporary variable that does not have
3599 it's DECL_CONTECT() properly set. */
3601 fix_temporary_vars_context_r (tree
*node
,
3605 gcc_assert (current_function_decl
);
3607 if (TREE_CODE (*node
) == BIND_EXPR
)
3611 for (var
= BIND_EXPR_VARS (*node
); var
; var
= DECL_CHAIN (var
))
3614 && DECL_ARTIFICIAL (var
)
3615 && !DECL_CONTEXT (var
))
3616 DECL_CONTEXT (var
) = current_function_decl
;
3622 /* Set up to handle the initialization or destruction of DECL. If
3623 INITP is nonzero, we are initializing the variable. Otherwise, we
3624 are destroying it. */
3627 one_static_initialization_or_destruction (tree decl
, tree init
, bool initp
)
3629 tree guard_if_stmt
= NULL_TREE
;
3632 /* If we are supposed to destruct and there's a trivial destructor,
3633 nothing has to be done. */
3635 && TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl
)))
3638 /* Trick the compiler into thinking we are at the file and line
3639 where DECL was declared so that error-messages make sense, and so
3640 that the debugger will show somewhat sensible file and line
3642 input_location
= DECL_SOURCE_LOCATION (decl
);
3644 /* Make sure temporary variables in the initialiser all have
3645 their DECL_CONTEXT() set to a value different from NULL_TREE.
3646 This can happen when global variables initializers are built.
3647 In that case, the DECL_CONTEXT() of the global variables _AND_ of all
3648 the temporary variables that might have been generated in the
3649 accompanying initializers is NULL_TREE, meaning the variables have been
3650 declared in the global namespace.
3651 What we want to do here is to fix that and make sure the DECL_CONTEXT()
3652 of the temporaries are set to the current function decl. */
3653 cp_walk_tree_without_duplicates (&init
,
3654 fix_temporary_vars_context_r
,
3661 Access control for implicit calls to the constructors,
3662 the conversion functions, or the destructor called to
3663 create and destroy a static data member is performed as
3664 if these calls appeared in the scope of the member's
3667 we pretend we are in a static member function of the class of
3668 which the DECL is a member. */
3669 if (member_p (decl
))
3671 DECL_CONTEXT (current_function_decl
) = DECL_CONTEXT (decl
);
3672 DECL_STATIC_FUNCTION_P (current_function_decl
) = 1;
3675 /* Assume we don't need a guard. */
3677 /* We need a guard if this is an object with external linkage that
3678 might be initialized in more than one place. (For example, a
3679 static data member of a template, when the data member requires
3681 if (NEEDS_GUARD_P (decl
))
3685 guard
= get_guard (decl
);
3687 /* When using __cxa_atexit, we just check the GUARD as we would
3688 for a local static. */
3689 if (flag_use_cxa_atexit
)
3691 /* When using __cxa_atexit, we never try to destroy
3692 anything from a static destructor. */
3694 guard_cond
= get_guard_cond (guard
, false);
3696 /* If we don't have __cxa_atexit, then we will be running
3697 destructors from .fini sections, or their equivalents. So,
3698 we need to know how many times we've tried to initialize this
3699 object. We do initializations only if the GUARD is zero,
3700 i.e., if we are the first to initialize the variable. We do
3701 destructions only if the GUARD is one, i.e., if we are the
3702 last to destroy the variable. */
3705 = cp_build_binary_op (input_location
,
3707 cp_build_unary_op (PREINCREMENT_EXPR
,
3710 tf_warning_or_error
),
3712 tf_warning_or_error
);
3715 = cp_build_binary_op (input_location
,
3717 cp_build_unary_op (PREDECREMENT_EXPR
,
3720 tf_warning_or_error
),
3722 tf_warning_or_error
);
3724 guard_if_stmt
= begin_if_stmt ();
3725 finish_if_stmt_cond (guard_cond
, guard_if_stmt
);
3729 /* If we're using __cxa_atexit, we have not already set the GUARD,
3730 so we must do so now. */
3731 if (guard
&& initp
&& flag_use_cxa_atexit
)
3732 finish_expr_stmt (set_guard (guard
));
3734 /* Perform the initialization or destruction. */
3739 finish_expr_stmt (init
);
3740 if (flag_sanitize
& SANITIZE_ADDRESS
)
3742 varpool_node
*vnode
= varpool_node::get (decl
);
3744 vnode
->dynamically_initialized
= 1;
3748 /* If we're using __cxa_atexit, register a function that calls the
3749 destructor for the object. */
3750 if (flag_use_cxa_atexit
)
3751 finish_expr_stmt (register_dtor_fn (decl
));
3754 finish_expr_stmt (build_cleanup (decl
));
3756 /* Finish the guard if-stmt, if necessary. */
3759 finish_then_clause (guard_if_stmt
);
3760 finish_if_stmt (guard_if_stmt
);
3763 /* Now that we're done with DECL we don't need to pretend to be a
3764 member of its class any longer. */
3765 DECL_CONTEXT (current_function_decl
) = NULL_TREE
;
3766 DECL_STATIC_FUNCTION_P (current_function_decl
) = 0;
3769 /* Generate code to do the initialization or destruction of the decls in VARS,
3770 a TREE_LIST of VAR_DECL with static storage duration.
3771 Whether initialization or destruction is performed is specified by INITP. */
3774 do_static_initialization_or_destruction (tree vars
, bool initp
)
3776 tree node
, init_if_stmt
, cond
;
3778 /* Build the outer if-stmt to check for initialization or destruction. */
3779 init_if_stmt
= begin_if_stmt ();
3780 cond
= initp
? integer_one_node
: integer_zero_node
;
3781 cond
= cp_build_binary_op (input_location
,
3785 tf_warning_or_error
);
3786 finish_if_stmt_cond (cond
, init_if_stmt
);
3788 /* To make sure dynamic construction doesn't access globals from other
3789 compilation units where they might not be yet constructed, for
3790 -fsanitize=address insert __asan_before_dynamic_init call that
3791 prevents access to either all global variables that need construction
3792 in other compilation units, or at least those that haven't been
3793 initialized yet. Variables that need dynamic construction in
3794 the current compilation unit are kept accessible. */
3795 if (initp
&& (flag_sanitize
& SANITIZE_ADDRESS
))
3796 finish_expr_stmt (asan_dynamic_init_call (/*after_p=*/false));
3800 tree decl
= TREE_VALUE (node
);
3801 tree priority_if_stmt
;
3805 /* If we don't need a destructor, there's nothing to do. Avoid
3806 creating a possibly empty if-stmt. */
3807 if (!initp
&& TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl
)))
3809 node
= TREE_CHAIN (node
);
3813 /* Remember that we had an initialization or finalization at this
3815 priority
= DECL_EFFECTIVE_INIT_PRIORITY (decl
);
3816 pi
= get_priority_info (priority
);
3818 pi
->initializations_p
= 1;
3820 pi
->destructions_p
= 1;
3822 /* Conditionalize this initialization on being in the right priority
3823 and being initializing/finalizing appropriately. */
3824 priority_if_stmt
= begin_if_stmt ();
3825 cond
= cp_build_binary_op (input_location
,
3828 build_int_cst (NULL_TREE
, priority
),
3829 tf_warning_or_error
);
3830 finish_if_stmt_cond (cond
, priority_if_stmt
);
3832 /* Process initializers with same priority. */
3834 && DECL_EFFECTIVE_INIT_PRIORITY (TREE_VALUE (node
)) == priority
;
3835 node
= TREE_CHAIN (node
))
3836 /* Do one initialization or destruction. */
3837 one_static_initialization_or_destruction (TREE_VALUE (node
),
3838 TREE_PURPOSE (node
), initp
);
3840 /* Finish up the priority if-stmt body. */
3841 finish_then_clause (priority_if_stmt
);
3842 finish_if_stmt (priority_if_stmt
);
3846 /* Revert what __asan_before_dynamic_init did by calling
3847 __asan_after_dynamic_init. */
3848 if (initp
&& (flag_sanitize
& SANITIZE_ADDRESS
))
3849 finish_expr_stmt (asan_dynamic_init_call (/*after_p=*/true));
3851 /* Finish up the init/destruct if-stmt body. */
3852 finish_then_clause (init_if_stmt
);
3853 finish_if_stmt (init_if_stmt
);
3856 /* VARS is a list of variables with static storage duration which may
3857 need initialization and/or finalization. Remove those variables
3858 that don't really need to be initialized or finalized, and return
3859 the resulting list. The order in which the variables appear in
3860 VARS is in reverse order of the order in which they should actually
3861 be initialized. The list we return is in the unreversed order;
3862 i.e., the first variable should be initialized first. */
3865 prune_vars_needing_no_initialization (tree
*vars
)
3868 tree result
= NULL_TREE
;
3873 tree decl
= TREE_VALUE (t
);
3874 tree init
= TREE_PURPOSE (t
);
3876 /* Deal gracefully with error. */
3877 if (error_operand_p (decl
))
3879 var
= &TREE_CHAIN (t
);
3883 /* The only things that can be initialized are variables. */
3884 gcc_assert (VAR_P (decl
));
3886 /* If this object is not defined, we don't need to do anything
3888 if (DECL_EXTERNAL (decl
))
3890 var
= &TREE_CHAIN (t
);
3894 /* Also, if the initializer already contains errors, we can bail
3896 if (init
&& TREE_CODE (init
) == TREE_LIST
3897 && value_member (error_mark_node
, init
))
3899 var
= &TREE_CHAIN (t
);
3903 /* This variable is going to need initialization and/or
3904 finalization, so we add it to the list. */
3905 *var
= TREE_CHAIN (t
);
3906 TREE_CHAIN (t
) = result
;
3913 /* Make sure we have told the back end about all the variables in
3917 write_out_vars (tree vars
)
3921 for (v
= vars
; v
; v
= TREE_CHAIN (v
))
3923 tree var
= TREE_VALUE (v
);
3924 if (!var_finalized_p (var
))
3926 import_export_decl (var
);
3927 rest_of_decl_compilation (var
, 1, 1);
3932 /* Generate a static constructor (if CONSTRUCTOR_P) or destructor
3933 (otherwise) that will initialize all global objects with static
3934 storage duration having the indicated PRIORITY. */
3937 generate_ctor_or_dtor_function (bool constructor_p
, int priority
,
3945 input_location
= *locus
;
3947 /* Was: locus->line++; */
3949 /* We use `I' to indicate initialization and `D' to indicate
3951 function_key
= constructor_p
? 'I' : 'D';
3953 /* We emit the function lazily, to avoid generating empty
3954 global constructors and destructors. */
3957 /* For Objective-C++, we may need to initialize metadata found in this module.
3958 This must be done _before_ any other static initializations. */
3959 if (c_dialect_objc () && (priority
== DEFAULT_INIT_PRIORITY
)
3960 && constructor_p
&& objc_static_init_needed_p ())
3962 body
= start_objects (function_key
, priority
);
3963 objc_generate_static_init_call (NULL_TREE
);
3966 /* Call the static storage duration function with appropriate
3968 FOR_EACH_VEC_SAFE_ELT (ssdf_decls
, i
, fndecl
)
3970 /* Calls to pure or const functions will expand to nothing. */
3971 if (! (flags_from_decl_or_type (fndecl
) & (ECF_CONST
| ECF_PURE
)))
3976 body
= start_objects (function_key
, priority
);
3978 call
= cp_build_function_call_nary (fndecl
, tf_warning_or_error
,
3979 build_int_cst (NULL_TREE
,
3981 build_int_cst (NULL_TREE
,
3984 finish_expr_stmt (call
);
3988 /* Close out the function. */
3990 finish_objects (function_key
, priority
, body
);
3993 /* Generate constructor and destructor functions for the priority
3997 generate_ctor_and_dtor_functions_for_priority (splay_tree_node n
, void * data
)
3999 location_t
*locus
= (location_t
*) data
;
4000 int priority
= (int) n
->key
;
4001 priority_info pi
= (priority_info
) n
->value
;
4003 /* Generate the functions themselves, but only if they are really
4005 if (pi
->initializations_p
)
4006 generate_ctor_or_dtor_function (/*constructor_p=*/true, priority
, locus
);
4007 if (pi
->destructions_p
)
4008 generate_ctor_or_dtor_function (/*constructor_p=*/false, priority
, locus
);
4010 /* Keep iterating. */
4014 /* Return C++ property of T, based on given operation OP. */
4017 cpp_check (tree t
, cpp_operation op
)
4021 case HAS_DEPENDENT_TEMPLATE_ARGS
:
4023 tree ti
= CLASSTYPE_TEMPLATE_INFO (t
);
4026 ++processing_template_decl
;
4027 const bool dep
= any_dependent_template_arguments_p (TI_ARGS (ti
));
4028 --processing_template_decl
;
4032 return DECL_PURE_VIRTUAL_P (t
);
4033 case IS_CONSTRUCTOR
:
4034 return DECL_CONSTRUCTOR_P (t
);
4036 return DECL_DESTRUCTOR_P (t
);
4037 case IS_COPY_CONSTRUCTOR
:
4038 return DECL_COPY_CONSTRUCTOR_P (t
);
4039 case IS_MOVE_CONSTRUCTOR
:
4040 return DECL_MOVE_CONSTRUCTOR_P (t
);
4042 return TREE_CODE (t
) == TEMPLATE_DECL
;
4044 return trivial_type_p (t
);
4050 /* Collect source file references recursively, starting from NAMESPC. */
4053 collect_source_refs (tree namespc
)
4055 /* Iterate over names in this name space. */
4056 for (tree t
= NAMESPACE_LEVEL (namespc
)->names
; t
; t
= TREE_CHAIN (t
))
4057 if (DECL_IS_BUILTIN (t
))
4059 else if (TREE_CODE (t
) == NAMESPACE_DECL
&& !DECL_NAMESPACE_ALIAS (t
))
4060 collect_source_refs (t
);
4062 collect_source_ref (DECL_SOURCE_FILE (t
));
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
)
4071 tree decl
= NAMESPACE_LEVEL (namespc
)->names
;
4073 /* Collect decls from this namespace. This will skip
4074 NAMESPACE_DECLs (both aliases and regular, it cannot tell). */
4075 collect_ada_nodes (decl
, source_file
);
4077 /* Now scan for namespace children, and dump them. */
4078 for (; decl
; decl
= TREE_CHAIN (decl
))
4079 if (TREE_CODE (decl
) == NAMESPACE_DECL
&& !DECL_NAMESPACE_ALIAS (decl
))
4080 collect_ada_namespace (decl
, source_file
);
4083 /* Returns true iff there is a definition available for variable or
4087 decl_defined_p (tree decl
)
4089 if (TREE_CODE (decl
) == FUNCTION_DECL
)
4090 return (DECL_INITIAL (decl
) != NULL_TREE
4091 /* A pending instantiation of a friend temploid is defined. */
4092 || (DECL_FRIEND_PSEUDO_TEMPLATE_INSTANTIATION (decl
)
4093 && DECL_INITIAL (DECL_TEMPLATE_RESULT
4094 (DECL_TI_TEMPLATE (decl
)))));
4097 gcc_assert (VAR_P (decl
));
4098 return !DECL_EXTERNAL (decl
);
4102 /* Nonzero for a VAR_DECL whose value can be used in a constant expression.
4106 An integral constant-expression can only involve ... const
4107 variables of integral or enumeration types initialized with
4108 constant expressions ...
4110 C++0x also allows constexpr variables and temporaries initialized
4111 with constant expressions. We handle the former here, but the latter
4112 are just folded away in cxx_eval_constant_expression.
4114 The standard does not require that the expression be non-volatile.
4115 G++ implements the proposed correction in DR 457. */
4118 decl_constant_var_p (tree decl
)
4120 if (!decl_maybe_constant_var_p (decl
))
4123 /* We don't know if a template static data member is initialized with
4124 a constant expression until we instantiate its initializer. Even
4125 in the case of a constexpr variable, we can't treat it as a
4126 constant until its initializer is complete in case it's used in
4127 its own initializer. */
4128 maybe_instantiate_decl (decl
);
4129 return DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl
);
4132 /* Returns true if DECL could be a symbolic constant variable, depending on
4136 decl_maybe_constant_var_p (tree decl
)
4138 tree type
= TREE_TYPE (decl
);
4141 if (DECL_DECLARED_CONSTEXPR_P (decl
))
4143 if (DECL_HAS_VALUE_EXPR_P (decl
))
4144 /* A proxy isn't constant. */
4146 if (TREE_CODE (type
) == REFERENCE_TYPE
)
4147 /* References can be constant. */
4149 return (CP_TYPE_CONST_NON_VOLATILE_P (type
)
4150 && INTEGRAL_OR_ENUMERATION_TYPE_P (type
));
4153 /* Complain that DECL uses a type with no linkage. In C++98 mode this is
4154 called from grokfndecl and grokvardecl; in all modes it is called from
4155 cp_write_global_declarations. */
4158 no_linkage_error (tree decl
)
4160 if (cxx_dialect
>= cxx11
&& decl_defined_p (decl
))
4161 /* In C++11 it's ok if the decl is defined. */
4163 tree t
= no_linkage_check (TREE_TYPE (decl
), /*relaxed_p=*/false);
4165 /* The type that got us on no_linkage_decls must have gotten a name for
4166 linkage purposes. */;
4167 else if (CLASS_TYPE_P (t
) && TYPE_BEING_DEFINED (t
))
4168 /* The type might end up having a typedef name for linkage purposes. */
4169 vec_safe_push (no_linkage_decls
, decl
);
4170 else if (TYPE_UNNAMED_P (t
))
4173 if (cxx_dialect
>= cxx11
)
4174 d
= permerror (DECL_SOURCE_LOCATION (decl
), "%q#D, declared using "
4175 "unnamed type, is used but never defined", decl
);
4176 else if (DECL_EXTERN_C_P (decl
))
4177 /* Allow this; it's pretty common in C. */;
4178 else if (VAR_P (decl
))
4179 /* DRs 132, 319 and 389 seem to indicate types with
4180 no linkage can only be used to declare extern "C"
4181 entities. Since it's not always an error in the
4182 ISO C++ 90 Standard, we only issue a warning. */
4183 d
= warning_at (DECL_SOURCE_LOCATION (decl
), 0, "unnamed type "
4184 "with no linkage used to declare variable %q#D with "
4187 d
= permerror (DECL_SOURCE_LOCATION (decl
), "unnamed type with no "
4188 "linkage used to declare function %q#D with linkage",
4190 if (d
&& is_typedef_decl (TYPE_NAME (t
)))
4191 inform (DECL_SOURCE_LOCATION (TYPE_NAME (t
)), "%q#D does not refer "
4192 "to the unqualified type, so it is not used for linkage",
4195 else if (cxx_dialect
>= cxx11
)
4197 if (VAR_P (decl
) || !DECL_PURE_VIRTUAL_P (decl
))
4198 permerror (DECL_SOURCE_LOCATION (decl
),
4199 "%q#D, declared using local type "
4200 "%qT, is used but never defined", decl
, t
);
4202 else if (VAR_P (decl
))
4203 warning_at (DECL_SOURCE_LOCATION (decl
), 0, "type %qT with no linkage "
4204 "used to declare variable %q#D with linkage", t
, decl
);
4206 permerror (DECL_SOURCE_LOCATION (decl
), "type %qT with no linkage used "
4207 "to declare function %q#D with linkage", t
, decl
);
4210 /* Collect declarations from all namespaces relevant to SOURCE_FILE. */
4213 collect_all_refs (const char *source_file
)
4215 collect_ada_namespace (global_namespace
, source_file
);
4218 /* Clear DECL_EXTERNAL for NODE. */
4221 clear_decl_external (struct cgraph_node
*node
, void * /*data*/)
4223 DECL_EXTERNAL (node
->decl
) = 0;
4227 /* Build up the function to run dynamic initializers for thread_local
4228 variables in this translation unit and alias the init functions for the
4229 individual variables to it. */
4232 handle_tls_init (void)
4234 tree vars
= prune_vars_needing_no_initialization (&tls_aggregates
);
4235 if (vars
== NULL_TREE
)
4238 location_t loc
= DECL_SOURCE_LOCATION (TREE_VALUE (vars
));
4240 write_out_vars (vars
);
4242 tree guard
= build_decl (loc
, VAR_DECL
, get_identifier ("__tls_guard"),
4244 TREE_PUBLIC (guard
) = false;
4245 TREE_STATIC (guard
) = true;
4246 DECL_ARTIFICIAL (guard
) = true;
4247 DECL_IGNORED_P (guard
) = true;
4248 TREE_USED (guard
) = true;
4249 CP_DECL_THREAD_LOCAL_P (guard
) = true;
4250 set_decl_tls_model (guard
, decl_default_tls_model (guard
));
4251 pushdecl_top_level_and_finish (guard
, NULL_TREE
);
4253 tree fn
= get_local_tls_init_fn ();
4254 start_preparsed_function (fn
, NULL_TREE
, SF_PRE_PARSED
);
4255 tree body
= begin_function_body ();
4256 tree if_stmt
= begin_if_stmt ();
4257 tree cond
= cp_build_unary_op (TRUTH_NOT_EXPR
, guard
, false,
4258 tf_warning_or_error
);
4259 finish_if_stmt_cond (cond
, if_stmt
);
4260 finish_expr_stmt (cp_build_modify_expr (loc
, guard
, NOP_EXPR
,
4262 tf_warning_or_error
));
4263 for (; vars
; vars
= TREE_CHAIN (vars
))
4265 tree var
= TREE_VALUE (vars
);
4266 tree init
= TREE_PURPOSE (vars
);
4267 one_static_initialization_or_destruction (var
, init
, true);
4269 #ifdef ASM_OUTPUT_DEF
4270 /* Output init aliases even with -fno-extern-tls-init. */
4271 if (TREE_PUBLIC (var
))
4273 tree single_init_fn
= get_tls_init_fn (var
);
4274 if (single_init_fn
== NULL_TREE
)
4277 = cgraph_node::get_create (fn
)->create_same_body_alias
4278 (single_init_fn
, fn
);
4279 gcc_assert (alias
!= NULL
);
4284 finish_then_clause (if_stmt
);
4285 finish_if_stmt (if_stmt
);
4286 finish_function_body (body
);
4287 expand_or_defer_fn (finish_function (0));
4290 /* We're at the end of compilation, so generate any mangling aliases that
4291 we've been saving up, if DECL is going to be output and ID2 isn't
4292 already taken by another declaration. */
4295 generate_mangling_alias (tree decl
, tree id2
)
4297 /* If there's a declaration already using this mangled name,
4298 don't create a compatibility alias that conflicts. */
4299 if (IDENTIFIER_GLOBAL_VALUE (id2
))
4302 struct cgraph_node
*n
= NULL
;
4303 if (TREE_CODE (decl
) == FUNCTION_DECL
4304 && !(n
= cgraph_node::get (decl
)))
4305 /* Don't create an alias to an unreferenced function. */
4308 tree alias
= make_alias_for (decl
, id2
);
4309 SET_IDENTIFIER_GLOBAL_VALUE (id2
, alias
);
4310 DECL_IGNORED_P (alias
) = 1;
4311 TREE_PUBLIC (alias
) = TREE_PUBLIC (decl
);
4312 DECL_VISIBILITY (alias
) = DECL_VISIBILITY (decl
);
4313 if (vague_linkage_p (decl
))
4314 DECL_WEAK (alias
) = 1;
4315 if (TREE_CODE (decl
) == FUNCTION_DECL
)
4316 n
->create_same_body_alias (alias
, decl
);
4318 varpool_node::create_extra_name_alias (alias
, decl
);
4321 /* Note that we might want to emit an alias with the symbol ID2 for DECL at
4322 the end of translation, for compatibility across bugs in the mangling
4326 note_mangling_alias (tree decl ATTRIBUTE_UNUSED
, tree id2 ATTRIBUTE_UNUSED
)
4328 #ifdef ASM_OUTPUT_DEF
4329 if (!defer_mangling_aliases
)
4330 generate_mangling_alias (decl
, id2
);
4333 vec_safe_push (mangling_aliases
, decl
);
4334 vec_safe_push (mangling_aliases
, id2
);
4339 /* Emit all mangling aliases that were deferred up to this point. */
4342 generate_mangling_aliases ()
4344 while (!vec_safe_is_empty (mangling_aliases
))
4346 tree id2
= mangling_aliases
->pop();
4347 tree decl
= mangling_aliases
->pop();
4348 generate_mangling_alias (decl
, id2
);
4350 defer_mangling_aliases
= false;
4353 /* The entire file is now complete. If requested, dump everything
4360 if (FILE *stream
= dump_begin (raw_dump_id
, &flags
))
4362 dump_node (global_namespace
, flags
& ~TDF_SLIM
, stream
);
4363 dump_end (raw_dump_id
, stream
);
4367 static location_t locus_at_end_of_parsing
;
4369 /* Check the deallocation functions for CODE to see if we want to warn that
4370 only one was defined. */
4373 maybe_warn_sized_delete (enum tree_code code
)
4375 tree sized
= NULL_TREE
;
4376 tree unsized
= NULL_TREE
;
4378 for (ovl_iterator
iter (IDENTIFIER_GLOBAL_VALUE (cp_operator_id (code
)));
4382 /* We're only interested in usual deallocation functions. */
4383 if (!usual_deallocation_fn_p (fn
))
4385 if (FUNCTION_ARG_CHAIN (fn
) == void_list_node
)
4390 if (DECL_INITIAL (unsized
) && !DECL_INITIAL (sized
))
4391 warning_at (DECL_SOURCE_LOCATION (unsized
), OPT_Wsized_deallocation
,
4392 "the program should also define %qD", sized
);
4393 else if (!DECL_INITIAL (unsized
) && DECL_INITIAL (sized
))
4394 warning_at (DECL_SOURCE_LOCATION (sized
), OPT_Wsized_deallocation
,
4395 "the program should also define %qD", unsized
);
4398 /* Check the global deallocation functions to see if we want to warn about
4399 defining unsized without sized (or vice versa). */
4402 maybe_warn_sized_delete ()
4404 if (!flag_sized_deallocation
|| !warn_sized_deallocation
)
4406 maybe_warn_sized_delete (DELETE_EXPR
);
4407 maybe_warn_sized_delete (VEC_DELETE_EXPR
);
4410 /* Earlier we left PTRMEM_CST in variable initializers alone so that we could
4411 look them up when evaluating non-type template parameters. Now we need to
4412 lower them to something the back end can understand. */
4418 FOR_EACH_VARIABLE (node
)
4420 tree d
= node
->decl
;
4421 if (tree init
= DECL_INITIAL (d
))
4422 DECL_INITIAL (d
) = cplus_expand_constant (init
);
4426 /* This routine is called at the end of compilation.
4427 Its job is to create all the code needed to initialize and
4428 destroy the global aggregates. We do the destruction
4429 first, since that way we only need to reverse the decls once. */
4432 c_parse_final_cleanups (void)
4437 unsigned ssdf_count
= 0;
4441 locus_at_end_of_parsing
= input_location
;
4444 /* Bad parse errors. Just forget about it. */
4445 if (! global_bindings_p () || current_class_type
4446 || !vec_safe_is_empty (decl_namespace_list
))
4449 /* This is the point to write out a PCH if we're doing that.
4450 In that case we do not want to do anything else. */
4453 /* Mangle all symbols at PCH creation time. */
4455 FOR_EACH_SYMBOL (node
)
4456 if (! is_a
<varpool_node
*> (node
)
4457 || ! DECL_HARD_REGISTER (node
->decl
))
4458 DECL_ASSEMBLER_NAME (node
->decl
);
4459 c_common_write_pch ();
4461 /* Ensure even the callers don't try to finalize the CU. */
4462 flag_syntax_only
= 1;
4466 timevar_stop (TV_PHASE_PARSING
);
4467 timevar_start (TV_PHASE_DEFERRED
);
4469 symtab
->process_same_body_aliases ();
4471 /* Handle -fdump-ada-spec[-slim] */
4472 if (flag_dump_ada_spec
|| flag_dump_ada_spec_slim
)
4474 if (flag_dump_ada_spec_slim
)
4475 collect_source_ref (main_input_filename
);
4477 collect_source_refs (global_namespace
);
4479 dump_ada_specs (collect_all_refs
, cpp_check
);
4482 /* FIXME - huh? was input_line -= 1;*/
4484 /* We now have to write out all the stuff we put off writing out.
4487 o Template specializations that we have not yet instantiated,
4488 but which are needed.
4489 o Initialization and destruction for non-local objects with
4490 static storage duration. (Local objects with static storage
4491 duration are initialized when their scope is first entered,
4492 and are cleaned up via atexit.)
4493 o Virtual function tables.
4495 All of these may cause others to be needed. For example,
4496 instantiating one function may cause another to be needed, and
4497 generating the initializer for an object may cause templates to be
4498 instantiated, etc., etc. */
4500 emit_support_tinfos ();
4509 /* If there are templates that we've put off instantiating, do
4511 instantiate_pending_templates (retries
);
4514 /* Write out virtual tables as required. Note that writing out
4515 the virtual table for a template class may cause the
4516 instantiation of members of that class. If we write out
4517 vtables then we remove the class from our list so we don't
4518 have to look at it again. */
4520 while (keyed_classes
!= NULL_TREE
4521 && maybe_emit_vtables (TREE_VALUE (keyed_classes
)))
4524 keyed_classes
= TREE_CHAIN (keyed_classes
);
4530 tree next
= TREE_CHAIN (t
);
4534 if (maybe_emit_vtables (TREE_VALUE (next
)))
4537 TREE_CHAIN (t
) = TREE_CHAIN (next
);
4542 next
= TREE_CHAIN (t
);
4546 /* Write out needed type info variables. We have to be careful
4547 looping through unemitted decls, because emit_tinfo_decl may
4548 cause other variables to be needed. New elements will be
4549 appended, and we remove from the vector those that actually
4551 for (i
= unemitted_tinfo_decls
->length ();
4552 unemitted_tinfo_decls
->iterate (--i
, &t
);)
4553 if (emit_tinfo_decl (t
))
4556 unemitted_tinfo_decls
->unordered_remove (i
);
4559 /* The list of objects with static storage duration is built up
4560 in reverse order. We clear STATIC_AGGREGATES so that any new
4561 aggregates added during the initialization of these will be
4562 initialized in the correct order when we next come around the
4564 vars
= prune_vars_needing_no_initialization (&static_aggregates
);
4568 /* We need to start a new initialization function each time
4569 through the loop. That's because we need to know which
4570 vtables have been referenced, and TREE_SYMBOL_REFERENCED
4571 isn't computed until a function is finished, and written
4572 out. That's a deficiency in the back end. When this is
4573 fixed, these initialization functions could all become
4574 inline, with resulting performance improvements. */
4577 /* Set the line and file, so that it is obviously not from
4579 input_location
= locus_at_end_of_parsing
;
4580 ssdf_body
= start_static_storage_duration_function (ssdf_count
);
4582 /* Make sure the back end knows about all the variables. */
4583 write_out_vars (vars
);
4585 /* First generate code to do all the initializations. */
4587 do_static_initialization_or_destruction (vars
, /*initp=*/true);
4589 /* Then, generate code to do all the destructions. Do these
4590 in reverse order so that the most recently constructed
4591 variable is the first destroyed. If we're using
4592 __cxa_atexit, then we don't need to do this; functions
4593 were registered at initialization time to destroy the
4595 if (!flag_use_cxa_atexit
&& vars
)
4597 vars
= nreverse (vars
);
4598 do_static_initialization_or_destruction (vars
, /*initp=*/false);
4603 /* Finish up the static storage duration function for this
4605 input_location
= locus_at_end_of_parsing
;
4606 finish_static_storage_duration_function (ssdf_body
);
4608 /* All those initializations and finalizations might cause
4609 us to need more inline functions, more template
4610 instantiations, etc. */
4613 /* ??? was: locus_at_end_of_parsing.line++; */
4616 /* Now do the same for thread_local variables. */
4619 /* Go through the set of inline functions whose bodies have not
4620 been emitted yet. If out-of-line copies of these functions
4621 are required, emit them. */
4622 FOR_EACH_VEC_SAFE_ELT (deferred_fns
, i
, decl
)
4624 /* Does it need synthesizing? */
4625 if (DECL_DEFAULTED_FN (decl
) && ! DECL_INITIAL (decl
)
4626 && (! DECL_REALLY_EXTERN (decl
) || possibly_inlined_p (decl
)))
4628 /* Even though we're already at the top-level, we push
4629 there again. That way, when we pop back a few lines
4630 hence, all of our state is restored. Otherwise,
4631 finish_function doesn't clean things up, and we end
4632 up with CURRENT_FUNCTION_DECL set. */
4633 push_to_top_level ();
4634 /* The decl's location will mark where it was first
4635 needed. Save that so synthesize method can indicate
4636 where it was needed from, in case of error */
4637 input_location
= DECL_SOURCE_LOCATION (decl
);
4638 synthesize_method (decl
);
4639 pop_from_top_level ();
4643 if (!DECL_INITIAL (decl
) && decl_tls_wrapper_p (decl
))
4644 generate_tls_wrapper (decl
);
4646 if (!DECL_SAVED_TREE (decl
))
4649 /* We lie to the back end, pretending that some functions
4650 are not defined when they really are. This keeps these
4651 functions from being put out unnecessarily. But, we must
4652 stop lying when the functions are referenced, or if they
4653 are not comdat since they need to be put out now. If
4654 DECL_INTERFACE_KNOWN, then we have already set
4655 DECL_EXTERNAL appropriately, so there's no need to check
4656 again, and we do not want to clear DECL_EXTERNAL if a
4657 previous call to import_export_decl set it.
4659 This is done in a separate for cycle, because if some
4660 deferred function is contained in another deferred
4661 function later in deferred_fns varray,
4662 rest_of_compilation would skip this function and we
4663 really cannot expand the same function twice. */
4664 import_export_decl (decl
);
4665 if (DECL_NOT_REALLY_EXTERN (decl
)
4666 && DECL_INITIAL (decl
)
4667 && decl_needed_p (decl
))
4669 struct cgraph_node
*node
, *next
;
4671 node
= cgraph_node::get (decl
);
4672 if (node
->cpp_implicit_alias
)
4673 node
= node
->get_alias_target ();
4675 node
->call_for_symbol_thunks_and_aliases (clear_decl_external
,
4677 /* If we mark !DECL_EXTERNAL one of the symbols in some comdat
4678 group, we need to mark all symbols in the same comdat group
4680 if (node
->same_comdat_group
)
4681 for (next
= dyn_cast
<cgraph_node
*> (node
->same_comdat_group
);
4683 next
= dyn_cast
<cgraph_node
*> (next
->same_comdat_group
))
4684 next
->call_for_symbol_thunks_and_aliases (clear_decl_external
,
4688 /* If we're going to need to write this function out, and
4689 there's already a body for it, create RTL for it now.
4690 (There might be no body if this is a method we haven't
4691 gotten around to synthesizing yet.) */
4692 if (!DECL_EXTERNAL (decl
)
4693 && decl_needed_p (decl
)
4694 && !TREE_ASM_WRITTEN (decl
)
4695 && !cgraph_node::get (decl
)->definition
)
4697 /* We will output the function; no longer consider it in this
4699 DECL_DEFER_OUTPUT (decl
) = 0;
4700 /* Generate RTL for this function now that we know we
4702 expand_or_defer_fn (decl
);
4703 /* If we're compiling -fsyntax-only pretend that this
4704 function has been written out so that we don't try to
4706 if (flag_syntax_only
)
4707 TREE_ASM_WRITTEN (decl
) = 1;
4712 if (wrapup_namespace_globals ())
4715 /* Static data members are just like namespace-scope globals. */
4716 FOR_EACH_VEC_SAFE_ELT (pending_statics
, i
, decl
)
4718 if (var_finalized_p (decl
) || DECL_REALLY_EXTERN (decl
)
4719 /* Don't write it out if we haven't seen a definition. */
4720 || (DECL_IN_AGGR_P (decl
) && !DECL_INLINE_VAR_P (decl
)))
4722 import_export_decl (decl
);
4723 /* If this static data member is needed, provide it to the
4725 if (DECL_NOT_REALLY_EXTERN (decl
) && decl_needed_p (decl
))
4726 DECL_EXTERNAL (decl
) = 0;
4728 if (vec_safe_length (pending_statics
) != 0
4729 && wrapup_global_declarations (pending_statics
->address (),
4730 pending_statics
->length ()))
4739 generate_mangling_aliases ();
4741 /* All used inline functions must have a definition at this point. */
4742 FOR_EACH_VEC_SAFE_ELT (deferred_fns
, i
, decl
)
4744 if (/* Check online inline functions that were actually used. */
4745 DECL_ODR_USED (decl
) && DECL_DECLARED_INLINE_P (decl
)
4746 /* If the definition actually was available here, then the
4747 fact that the function was not defined merely represents
4748 that for some reason (use of a template repository,
4749 #pragma interface, etc.) we decided not to emit the
4751 && !DECL_INITIAL (decl
)
4752 /* Don't complain if the template was defined. */
4753 && !(DECL_TEMPLATE_INSTANTIATION (decl
)
4754 && DECL_INITIAL (DECL_TEMPLATE_RESULT
4755 (template_for_substitution (decl
)))))
4757 warning_at (DECL_SOURCE_LOCATION (decl
), 0,
4758 "inline function %qD used but never defined", decl
);
4759 /* Avoid a duplicate warning from check_global_declaration. */
4760 TREE_NO_WARNING (decl
) = 1;
4764 /* So must decls that use a type with no linkage. */
4765 FOR_EACH_VEC_SAFE_ELT (no_linkage_decls
, i
, decl
)
4766 no_linkage_error (decl
);
4768 maybe_warn_sized_delete ();
4770 /* Then, do the Objective-C stuff. This is where all the
4771 Objective-C module stuff gets generated (symtab,
4772 class/protocol/selector lists etc). This must be done after C++
4773 templates, destructors etc. so that selectors used in C++
4774 templates are properly allocated. */
4775 if (c_dialect_objc ())
4776 objc_write_global_declarations ();
4778 /* We give C linkage to static constructors and destructors. */
4779 push_lang_context (lang_name_c
);
4781 /* Generate initialization and destruction functions for all
4782 priorities for which they are required. */
4783 if (priority_info_map
)
4784 splay_tree_foreach (priority_info_map
,
4785 generate_ctor_and_dtor_functions_for_priority
,
4786 /*data=*/&locus_at_end_of_parsing
);
4787 else if (c_dialect_objc () && objc_static_init_needed_p ())
4788 /* If this is obj-c++ and we need a static init, call
4789 generate_ctor_or_dtor_function. */
4790 generate_ctor_or_dtor_function (/*constructor_p=*/true,
4791 DEFAULT_INIT_PRIORITY
,
4792 &locus_at_end_of_parsing
);
4794 /* We're done with the splay-tree now. */
4795 if (priority_info_map
)
4796 splay_tree_delete (priority_info_map
);
4798 /* Generate any missing aliases. */
4799 maybe_apply_pending_pragma_weaks ();
4801 /* We're done with static constructors, so we can go back to "C++"
4803 pop_lang_context ();
4805 if (flag_vtable_verify
)
4807 vtv_recover_class_info ();
4808 vtv_compute_class_hierarchy_transitive_closure ();
4809 vtv_build_vtable_verify_fndecl ();
4812 perform_deferred_noexcept_checks ();
4818 /* The entire file is now complete. If requested, dump everything
4822 if (flag_detailed_statistics
)
4824 dump_tree_statistics ();
4825 dump_time_statistics ();
4828 timevar_stop (TV_PHASE_DEFERRED
);
4829 timevar_start (TV_PHASE_PARSING
);
4831 /* Indicate that we're done with front end processing. */
4835 /* Perform any post compilation-proper cleanups for the C++ front-end.
4836 This should really go away. No front-end should need to do
4837 anything past the compilation process. */
4840 cxx_post_compilation_parsing_cleanups (void)
4842 timevar_start (TV_PHASE_LATE_PARSING_CLEANUPS
);
4844 if (flag_vtable_verify
)
4846 /* Generate the special constructor initialization function that
4847 calls __VLTRegisterPairs, and give it a very high
4848 initialization priority. This must be done after
4849 finalize_compilation_unit so that we have accurate
4850 information about which vtable will actually be emitted. */
4851 vtv_generate_init_routine ();
4854 input_location
= locus_at_end_of_parsing
;
4857 validate_conversion_obstack ();
4859 timevar_stop (TV_PHASE_LATE_PARSING_CLEANUPS
);
4862 /* FN is an OFFSET_REF, DOTSTAR_EXPR or MEMBER_REF indicating the
4863 function to call in parse-tree form; it has not yet been
4864 semantically analyzed. ARGS are the arguments to the function.
4865 They have already been semantically analyzed. This may change
4869 build_offset_ref_call_from_tree (tree fn
, vec
<tree
, va_gc
> **args
,
4870 tsubst_flags_t complain
)
4873 vec
<tree
, va_gc
> *orig_args
= NULL
;
4878 object
= TREE_OPERAND (fn
, 0);
4880 if (processing_template_decl
)
4882 gcc_assert (TREE_CODE (fn
) == DOTSTAR_EXPR
4883 || TREE_CODE (fn
) == MEMBER_REF
);
4884 if (type_dependent_expression_p (fn
)
4885 || any_type_dependent_arguments_p (*args
))
4886 return build_min_nt_call_vec (fn
, *args
);
4888 orig_args
= make_tree_vector_copy (*args
);
4890 /* Transform the arguments and add the implicit "this"
4891 parameter. That must be done before the FN is transformed
4892 because we depend on the form of FN. */
4893 make_args_non_dependent (*args
);
4894 object
= build_non_dependent_expr (object
);
4895 if (TREE_CODE (TREE_TYPE (fn
)) == METHOD_TYPE
)
4897 if (TREE_CODE (fn
) == DOTSTAR_EXPR
)
4898 object
= cp_build_addr_expr (object
, complain
);
4899 vec_safe_insert (*args
, 0, object
);
4901 /* Now that the arguments are done, transform FN. */
4902 fn
= build_non_dependent_expr (fn
);
4905 /* A qualified name corresponding to a bound pointer-to-member is
4906 represented as an OFFSET_REF:
4908 struct B { void g(); };
4910 void B::g() { (this->*p)(); } */
4911 if (TREE_CODE (fn
) == OFFSET_REF
)
4913 tree object_addr
= cp_build_addr_expr (object
, complain
);
4914 fn
= TREE_OPERAND (fn
, 1);
4915 fn
= get_member_function_from_ptrfunc (&object_addr
, fn
,
4917 vec_safe_insert (*args
, 0, object_addr
);
4920 if (CLASS_TYPE_P (TREE_TYPE (fn
)))
4921 expr
= build_op_call (fn
, args
, complain
);
4923 expr
= cp_build_function_call_vec (fn
, args
, complain
);
4924 if (processing_template_decl
&& expr
!= error_mark_node
)
4925 expr
= build_min_non_dep_call_vec (expr
, orig_fn
, orig_args
);
4927 if (orig_args
!= NULL
)
4928 release_tree_vector (orig_args
);
4935 check_default_args (tree x
)
4937 tree arg
= TYPE_ARG_TYPES (TREE_TYPE (x
));
4938 bool saw_def
= false;
4939 int i
= 0 - (TREE_CODE (TREE_TYPE (x
)) == METHOD_TYPE
);
4940 for (; arg
&& arg
!= void_list_node
; arg
= TREE_CHAIN (arg
), ++i
)
4942 if (TREE_PURPOSE (arg
))
4944 else if (saw_def
&& !PACK_EXPANSION_P (TREE_VALUE (arg
)))
4946 error ("default argument missing for parameter %P of %q+#D", i
, x
);
4947 TREE_PURPOSE (arg
) = error_mark_node
;
4952 /* Return true if function DECL can be inlined. This is used to force
4953 instantiation of methods that might be interesting for inlining. */
4955 possibly_inlined_p (tree decl
)
4957 gcc_assert (TREE_CODE (decl
) == FUNCTION_DECL
);
4958 if (DECL_UNINLINABLE (decl
))
4961 return DECL_DECLARED_INLINE_P (decl
);
4962 /* When optimizing, we might inline everything when flatten
4963 attribute or heuristics inlining for size or autoinlining
4968 /* Normally, we can wait until instantiation-time to synthesize DECL.
4969 However, if DECL is a static data member initialized with a constant
4970 or a constexpr function, we need it right now because a reference to
4971 such a data member or a call to such function is not value-dependent.
4972 For a function that uses auto in the return type, we need to instantiate
4973 it to find out its type. For OpenMP user defined reductions, we need
4974 them instantiated for reduction clauses which inline them by hand
4978 maybe_instantiate_decl (tree decl
)
4980 if (DECL_LANG_SPECIFIC (decl
)
4981 && DECL_TEMPLATE_INFO (decl
)
4982 && (decl_maybe_constant_var_p (decl
)
4983 || (TREE_CODE (decl
) == FUNCTION_DECL
4984 && DECL_OMP_DECLARE_REDUCTION_P (decl
))
4985 || undeduced_auto_decl (decl
))
4986 && !DECL_DECLARED_CONCEPT_P (decl
)
4987 && !uses_template_parms (DECL_TI_ARGS (decl
)))
4989 /* Instantiating a function will result in garbage collection. We
4990 must treat this situation as if we were within the body of a
4991 function so as to avoid collecting live data only referenced from
4992 the stack (such as overload resolution candidates). */
4994 instantiate_decl (decl
, /*defer_ok=*/false,
4995 /*expl_inst_class_mem_p=*/false);
5000 /* Mark DECL (either a _DECL or a BASELINK) as "used" in the program.
5001 If DECL is a specialization or implicitly declared class member,
5002 generate the actual definition. Return false if something goes
5003 wrong, true otherwise. */
5006 mark_used (tree decl
, tsubst_flags_t complain
)
5008 /* If DECL is a BASELINK for a single function, then treat it just
5009 like the DECL for the function. Otherwise, if the BASELINK is
5010 for an overloaded function, we don't know which function was
5011 actually used until after overload resolution. */
5012 if (BASELINK_P (decl
))
5014 decl
= BASELINK_FUNCTIONS (decl
);
5015 if (really_overloaded_fn (decl
))
5017 decl
= OVL_FIRST (decl
);
5020 /* Set TREE_USED for the benefit of -Wunused. */
5021 TREE_USED (decl
) = 1;
5022 /* And for structured bindings also the underlying decl. */
5023 if (DECL_DECOMPOSITION_P (decl
) && DECL_DECOMP_BASE (decl
))
5024 TREE_USED (DECL_DECOMP_BASE (decl
)) = 1;
5026 if (TREE_CODE (decl
) == TEMPLATE_DECL
)
5029 if (DECL_CLONED_FUNCTION_P (decl
))
5030 TREE_USED (DECL_CLONED_FUNCTION (decl
)) = 1;
5032 /* Mark enumeration types as used. */
5033 if (TREE_CODE (decl
) == CONST_DECL
)
5034 used_types_insert (DECL_CONTEXT (decl
));
5036 if (TREE_CODE (decl
) == FUNCTION_DECL
)
5037 maybe_instantiate_noexcept (decl
);
5039 if (TREE_CODE (decl
) == FUNCTION_DECL
5040 && DECL_DELETED_FN (decl
))
5042 if (DECL_ARTIFICIAL (decl
))
5044 if (DECL_OVERLOADED_OPERATOR_P (decl
) == TYPE_EXPR
5045 && LAMBDA_TYPE_P (DECL_CONTEXT (decl
)))
5047 /* We mark a lambda conversion op as deleted if we can't
5048 generate it properly; see maybe_add_lambda_conv_op. */
5049 sorry ("converting lambda which uses %<...%> to "
5050 "function pointer");
5054 if (complain
& tf_error
)
5056 error ("use of deleted function %qD", decl
);
5057 if (!maybe_explain_implicit_delete (decl
))
5058 inform (DECL_SOURCE_LOCATION (decl
), "declared here");
5063 if (TREE_DEPRECATED (decl
) && (complain
& tf_warning
)
5064 && deprecated_state
!= DEPRECATED_SUPPRESS
)
5065 warn_deprecated_use (decl
, NULL_TREE
);
5067 /* We can only check DECL_ODR_USED on variables or functions with
5068 DECL_LANG_SPECIFIC set, and these are also the only decls that we
5069 might need special handling for. */
5070 if (!VAR_OR_FUNCTION_DECL_P (decl
)
5071 || DECL_LANG_SPECIFIC (decl
) == NULL
5072 || DECL_THUNK_P (decl
))
5074 if (!processing_template_decl
5075 && !require_deduced_type (decl
, complain
))
5080 /* We only want to do this processing once. We don't need to keep trying
5081 to instantiate inline templates, because unit-at-a-time will make sure
5082 we get them compiled before functions that want to inline them. */
5083 if (DECL_ODR_USED (decl
))
5086 /* Normally, we can wait until instantiation-time to synthesize DECL.
5087 However, if DECL is a static data member initialized with a constant
5088 or a constexpr function, we need it right now because a reference to
5089 such a data member or a call to such function is not value-dependent.
5090 For a function that uses auto in the return type, we need to instantiate
5091 it to find out its type. For OpenMP user defined reductions, we need
5092 them instantiated for reduction clauses which inline them by hand
5094 maybe_instantiate_decl (decl
);
5096 if (processing_template_decl
|| in_template_function ())
5099 /* Check this too in case we're within instantiate_non_dependent_expr. */
5100 if (DECL_TEMPLATE_INFO (decl
)
5101 && uses_template_parms (DECL_TI_ARGS (decl
)))
5104 if (!require_deduced_type (decl
, complain
))
5107 if (builtin_pack_fn_p (decl
))
5109 error ("use of built-in parameter pack %qD outside of a template",
5114 /* If we don't need a value, then we don't need to synthesize DECL. */
5115 if (cp_unevaluated_operand
|| in_discarded_stmt
)
5118 DECL_ODR_USED (decl
) = 1;
5119 if (DECL_CLONED_FUNCTION_P (decl
))
5120 DECL_ODR_USED (DECL_CLONED_FUNCTION (decl
)) = 1;
5122 /* DR 757: A type without linkage shall not be used as the type of a
5123 variable or function with linkage, unless
5124 o the variable or function has extern "C" linkage (7.5 [dcl.link]), or
5125 o the variable or function is not used (3.2 [basic.def.odr]) or is
5126 defined in the same translation unit. */
5127 if (cxx_dialect
> cxx98
5128 && decl_linkage (decl
) != lk_none
5129 && !DECL_EXTERN_C_P (decl
)
5130 && !DECL_ARTIFICIAL (decl
)
5131 && !decl_defined_p (decl
)
5132 && no_linkage_check (TREE_TYPE (decl
), /*relaxed_p=*/false))
5134 if (is_local_extern (decl
))
5135 /* There's no way to define a local extern, and adding it to
5136 the vector interferes with GC, so give an error now. */
5137 no_linkage_error (decl
);
5139 vec_safe_push (no_linkage_decls
, decl
);
5142 if (TREE_CODE (decl
) == FUNCTION_DECL
&& DECL_DECLARED_INLINE_P (decl
)
5143 && !DECL_INITIAL (decl
) && !DECL_ARTIFICIAL (decl
))
5144 /* Remember it, so we can check it was defined. */
5145 note_vague_linkage_fn (decl
);
5147 /* Is it a synthesized method that needs to be synthesized? */
5148 if (TREE_CODE (decl
) == FUNCTION_DECL
5149 && DECL_NONSTATIC_MEMBER_FUNCTION_P (decl
)
5150 && DECL_DEFAULTED_FN (decl
)
5151 /* A function defaulted outside the class is synthesized either by
5152 cp_finish_decl or instantiate_decl. */
5153 && !DECL_DEFAULTED_OUTSIDE_CLASS_P (decl
)
5154 && ! DECL_INITIAL (decl
))
5156 /* Defer virtual destructors so that thunks get the right
5158 if (DECL_VIRTUAL_P (decl
) && !at_eof
)
5160 note_vague_linkage_fn (decl
);
5164 /* Remember the current location for a function we will end up
5165 synthesizing. Then we can inform the user where it was
5166 required in the case of error. */
5167 DECL_SOURCE_LOCATION (decl
) = input_location
;
5169 /* Synthesizing an implicitly defined member function will result in
5170 garbage collection. We must treat this situation as if we were
5171 within the body of a function so as to avoid collecting live data
5172 on the stack (such as overload resolution candidates).
5174 We could just let cp_write_global_declarations handle synthesizing
5175 this function by adding it to deferred_fns, but doing
5176 it at the use site produces better error messages. */
5178 synthesize_method (decl
);
5180 /* If this is a synthesized method we don't need to
5181 do the instantiation test below. */
5183 else if (VAR_OR_FUNCTION_DECL_P (decl
)
5184 && DECL_TEMPLATE_INFO (decl
)
5185 && !DECL_DECLARED_CONCEPT_P (decl
)
5186 && (!DECL_EXPLICIT_INSTANTIATION (decl
)
5187 || always_instantiate_p (decl
)))
5188 /* If this is a function or variable that is an instance of some
5189 template, we now know that we will need to actually do the
5190 instantiation. We check that DECL is not an explicit
5191 instantiation because that is not checked in instantiate_decl.
5193 We put off instantiating functions in order to improve compile
5194 times. Maintaining a stack of active functions is expensive,
5195 and the inliner knows to instantiate any functions it might
5196 need. Therefore, we always try to defer instantiation. */
5199 instantiate_decl (decl
, /*defer_ok=*/true,
5200 /*expl_inst_class_mem_p=*/false);
5208 mark_used (tree decl
)
5210 return mark_used (decl
, tf_warning_or_error
);
5214 vtv_start_verification_constructor_init_function (void)
5216 return start_objects ('I', MAX_RESERVED_INIT_PRIORITY
- 1);
5220 vtv_finish_verification_constructor_init_function (tree function_body
)
5224 finish_compound_stmt (function_body
);
5225 fn
= finish_function (0);
5226 DECL_STATIC_CONSTRUCTOR (fn
) = 1;
5227 decl_init_priority_insert (fn
, MAX_RESERVED_INIT_PRIORITY
- 1);
5232 #include "gt-cp-decl2.h"