1 /* Process declarations and variables for C++ compiler.
2 Copyright (C) 1988-2015 Free Software Foundation, Inc.
3 Hacked by Michael Tiemann (tiemann@cygnus.com)
5 This file is part of GCC.
7 GCC is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3, or (at your option)
12 GCC is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with GCC; see the file COPYING3. If not see
19 <http://www.gnu.org/licenses/>. */
22 /* Process declarations and symbol lookup for C++ front end.
23 Also constructs types; the standard scalar types at initialization,
24 and structure, union, array and enum types when they are declared. */
26 /* ??? not all decl nodes are given the most useful possible
27 line numbers. For example, the CONST_DECLs for enum values. */
31 #include "coretypes.h"
35 #include "c-family/c-common.h"
37 #include "stringpool.h"
41 #include "stor-layout.h"
46 #include "c-family/c-objc.h"
47 #include "tree-inline.h"
48 #include "c-family/c-pragma.h"
51 #include "langhooks.h"
52 #include "c-family/c-ada-spec.h"
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 bool acceptable_java_type (tree
);
71 static tree
start_objects (int, int);
72 static void finish_objects (int, int, tree
);
73 static tree
start_static_storage_duration_function (unsigned);
74 static void finish_static_storage_duration_function (tree
);
75 static priority_info
get_priority_info (int);
76 static void do_static_initialization_or_destruction (tree
, bool);
77 static void one_static_initialization_or_destruction (tree
, tree
, bool);
78 static void generate_ctor_or_dtor_function (bool, int, location_t
*);
79 static int generate_ctor_and_dtor_functions_for_priority (splay_tree_node
,
81 static tree
prune_vars_needing_no_initialization (tree
*);
82 static void write_out_vars (tree
);
83 static void import_export_class (tree
);
84 static tree
get_guard_bits (tree
);
85 static void determine_visibility_from_class (tree
, tree
);
86 static bool determine_hidden_inline (tree
);
87 static bool decl_defined_p (tree
);
89 /* A list of static class variables. This is needed, because a
90 static class variable can be declared inside the class without
91 an initializer, and then initialized, statically, outside the class. */
92 static GTY(()) vec
<tree
, va_gc
> *pending_statics
;
94 /* A list of functions which were declared inline, but which we
95 may need to emit outline anyway. */
96 static GTY(()) vec
<tree
, va_gc
> *deferred_fns
;
98 /* A list of decls that use types with no linkage, which we need to make
100 static GTY(()) vec
<tree
, va_gc
> *no_linkage_decls
;
102 /* A vector of alternating decls and identifiers, where the latter
103 is to be an alias for the former if the former is defined. */
104 static GTY(()) vec
<tree
, va_gc
> *mangling_aliases
;
106 /* Nonzero if we're done parsing and into end-of-file activities. */
111 /* Return a member function type (a METHOD_TYPE), given FNTYPE (a
112 FUNCTION_TYPE), CTYPE (class type), and QUALS (the cv-qualifiers
113 that apply to the function). */
116 build_memfn_type (tree fntype
, tree ctype
, cp_cv_quals quals
,
117 cp_ref_qualifier rqual
)
122 bool late_return_type_p
;
124 if (fntype
== error_mark_node
|| ctype
== error_mark_node
)
125 return error_mark_node
;
127 gcc_assert (TREE_CODE (fntype
) == FUNCTION_TYPE
128 || TREE_CODE (fntype
) == METHOD_TYPE
);
130 type_quals
= quals
& ~TYPE_QUAL_RESTRICT
;
131 ctype
= cp_build_qualified_type (ctype
, type_quals
);
132 raises
= TYPE_RAISES_EXCEPTIONS (fntype
);
133 attrs
= TYPE_ATTRIBUTES (fntype
);
134 late_return_type_p
= TYPE_HAS_LATE_RETURN_TYPE (fntype
);
135 fntype
= build_method_type_directly (ctype
, TREE_TYPE (fntype
),
136 (TREE_CODE (fntype
) == METHOD_TYPE
137 ? TREE_CHAIN (TYPE_ARG_TYPES (fntype
))
138 : TYPE_ARG_TYPES (fntype
)));
140 fntype
= cp_build_type_attribute_variant (fntype
, attrs
);
142 fntype
= build_ref_qualified_type (fntype
, rqual
);
144 fntype
= build_exception_variant (fntype
, raises
);
145 if (late_return_type_p
)
146 TYPE_HAS_LATE_RETURN_TYPE (fntype
) = 1;
151 /* Return a variant of FNTYPE, a FUNCTION_TYPE or METHOD_TYPE, with its
152 return type changed to NEW_RET. */
155 change_return_type (tree new_ret
, tree fntype
)
158 tree args
= TYPE_ARG_TYPES (fntype
);
159 tree raises
= TYPE_RAISES_EXCEPTIONS (fntype
);
160 tree attrs
= TYPE_ATTRIBUTES (fntype
);
161 bool late_return_type_p
= TYPE_HAS_LATE_RETURN_TYPE (fntype
);
163 if (new_ret
== error_mark_node
)
166 if (same_type_p (new_ret
, TREE_TYPE (fntype
)))
169 if (TREE_CODE (fntype
) == FUNCTION_TYPE
)
171 newtype
= build_function_type (new_ret
, args
);
172 newtype
= apply_memfn_quals (newtype
,
173 type_memfn_quals (fntype
),
174 type_memfn_rqual (fntype
));
177 newtype
= build_method_type_directly
178 (class_of_this_parm (fntype
), new_ret
, TREE_CHAIN (args
));
179 if (FUNCTION_REF_QUALIFIED (fntype
))
180 newtype
= build_ref_qualified_type (newtype
, type_memfn_rqual (fntype
));
182 newtype
= build_exception_variant (newtype
, raises
);
184 newtype
= cp_build_type_attribute_variant (newtype
, attrs
);
185 if (late_return_type_p
)
186 TYPE_HAS_LATE_RETURN_TYPE (newtype
) = 1;
191 /* Build a PARM_DECL with NAME and TYPE, and set DECL_ARG_TYPE
195 cp_build_parm_decl (tree name
, tree type
)
197 tree parm
= build_decl (input_location
,
198 PARM_DECL
, name
, type
);
199 /* DECL_ARG_TYPE is only used by the back end and the back end never
201 if (!processing_template_decl
)
202 DECL_ARG_TYPE (parm
) = type_passed_as (type
);
207 /* Returns a PARM_DECL for a parameter of the indicated TYPE, with the
211 build_artificial_parm (tree name
, tree type
)
213 tree parm
= cp_build_parm_decl (name
, type
);
214 DECL_ARTIFICIAL (parm
) = 1;
215 /* All our artificial parms are implicitly `const'; they cannot be
217 TREE_READONLY (parm
) = 1;
221 /* Constructors for types with virtual baseclasses need an "in-charge" flag
222 saying whether this constructor is responsible for initialization of
223 virtual baseclasses or not. All destructors also need this "in-charge"
224 flag, which additionally determines whether or not the destructor should
225 free the memory for the object.
227 This function adds the "in-charge" flag to member function FN if
228 appropriate. It is called from grokclassfn and tsubst.
229 FN must be either a constructor or destructor.
231 The in-charge flag follows the 'this' parameter, and is followed by the
232 VTT parm (if any), then the user-written parms. */
235 maybe_retrofit_in_chrg (tree fn
)
237 tree basetype
, arg_types
, parms
, parm
, fntype
;
239 /* If we've already add the in-charge parameter don't do it again. */
240 if (DECL_HAS_IN_CHARGE_PARM_P (fn
))
243 /* When processing templates we can't know, in general, whether or
244 not we're going to have virtual baseclasses. */
245 if (processing_template_decl
)
248 /* We don't need an in-charge parameter for constructors that don't
249 have virtual bases. */
250 if (DECL_CONSTRUCTOR_P (fn
)
251 && !CLASSTYPE_VBASECLASSES (DECL_CONTEXT (fn
)))
254 arg_types
= TYPE_ARG_TYPES (TREE_TYPE (fn
));
255 basetype
= TREE_TYPE (TREE_VALUE (arg_types
));
256 arg_types
= TREE_CHAIN (arg_types
);
258 parms
= DECL_CHAIN (DECL_ARGUMENTS (fn
));
260 /* If this is a subobject constructor or destructor, our caller will
261 pass us a pointer to our VTT. */
262 if (CLASSTYPE_VBASECLASSES (DECL_CONTEXT (fn
)))
264 parm
= build_artificial_parm (vtt_parm_identifier
, vtt_parm_type
);
266 /* First add it to DECL_ARGUMENTS between 'this' and the real args... */
267 DECL_CHAIN (parm
) = parms
;
270 /* ...and then to TYPE_ARG_TYPES. */
271 arg_types
= hash_tree_chain (vtt_parm_type
, arg_types
);
273 DECL_HAS_VTT_PARM_P (fn
) = 1;
276 /* Then add the in-charge parm (before the VTT parm). */
277 parm
= build_artificial_parm (in_charge_identifier
, integer_type_node
);
278 DECL_CHAIN (parm
) = parms
;
280 arg_types
= hash_tree_chain (integer_type_node
, arg_types
);
282 /* Insert our new parameter(s) into the list. */
283 DECL_CHAIN (DECL_ARGUMENTS (fn
)) = parms
;
285 /* And rebuild the function type. */
286 fntype
= build_method_type_directly (basetype
, TREE_TYPE (TREE_TYPE (fn
)),
288 if (TYPE_RAISES_EXCEPTIONS (TREE_TYPE (fn
)))
289 fntype
= build_exception_variant (fntype
,
290 TYPE_RAISES_EXCEPTIONS (TREE_TYPE (fn
)));
291 if (TYPE_ATTRIBUTES (TREE_TYPE (fn
)))
292 fntype
= (cp_build_type_attribute_variant
293 (fntype
, TYPE_ATTRIBUTES (TREE_TYPE (fn
))));
294 TREE_TYPE (fn
) = fntype
;
296 /* Now we've got the in-charge parameter. */
297 DECL_HAS_IN_CHARGE_PARM_P (fn
) = 1;
300 /* Classes overload their constituent function names automatically.
301 When a function name is declared in a record structure,
302 its name is changed to it overloaded name. Since names for
303 constructors and destructors can conflict, we place a leading
306 CNAME is the name of the class we are grokking for.
308 FUNCTION is a FUNCTION_DECL. It was created by `grokdeclarator'.
310 FLAGS contains bits saying what's special about today's
311 arguments. DTOR_FLAG == DESTRUCTOR.
313 If FUNCTION is a destructor, then we must add the `auto-delete' field
314 as a second parameter. There is some hair associated with the fact
315 that we must "declare" this variable in the manner consistent with the
316 way the rest of the arguments were declared.
318 QUALS are the qualifiers for the this pointer. */
321 grokclassfn (tree ctype
, tree function
, enum overload_flags flags
)
323 tree fn_name
= DECL_NAME (function
);
325 /* Even within an `extern "C"' block, members get C++ linkage. See
326 [dcl.link] for details. */
327 SET_DECL_LANGUAGE (function
, lang_cplusplus
);
329 if (fn_name
== NULL_TREE
)
331 error ("name missing for member function");
332 fn_name
= get_identifier ("<anonymous>");
333 DECL_NAME (function
) = fn_name
;
336 DECL_CONTEXT (function
) = ctype
;
338 if (flags
== DTOR_FLAG
)
339 DECL_DESTRUCTOR_P (function
) = 1;
341 if (flags
== DTOR_FLAG
|| DECL_CONSTRUCTOR_P (function
))
342 maybe_retrofit_in_chrg (function
);
345 /* Create an ARRAY_REF, checking for the user doing things backwards
346 along the way. DECLTYPE_P is for N3276, as in the parser. */
349 grok_array_decl (location_t loc
, tree array_expr
, tree index_exp
,
354 tree orig_array_expr
= array_expr
;
355 tree orig_index_exp
= index_exp
;
357 if (error_operand_p (array_expr
) || error_operand_p (index_exp
))
358 return error_mark_node
;
360 if (processing_template_decl
)
362 if (type_dependent_expression_p (array_expr
)
363 || type_dependent_expression_p (index_exp
))
364 return build_min_nt_loc (loc
, ARRAY_REF
, array_expr
, index_exp
,
365 NULL_TREE
, NULL_TREE
);
366 array_expr
= build_non_dependent_expr (array_expr
);
367 index_exp
= build_non_dependent_expr (index_exp
);
370 type
= TREE_TYPE (array_expr
);
372 type
= non_reference (type
);
374 /* If they have an `operator[]', use that. */
375 if (MAYBE_CLASS_TYPE_P (type
) || MAYBE_CLASS_TYPE_P (TREE_TYPE (index_exp
)))
377 tsubst_flags_t complain
= tf_warning_or_error
;
379 complain
|= tf_decltype
;
380 expr
= build_new_op (loc
, ARRAY_REF
, LOOKUP_NORMAL
, array_expr
,
381 index_exp
, NULL_TREE
, /*overload=*/NULL
, complain
);
387 /* Otherwise, create an ARRAY_REF for a pointer or array type.
388 It is a little-known fact that, if `a' is an array and `i' is
389 an int, you can write `i[a]', which means the same thing as
391 if (TREE_CODE (type
) == ARRAY_TYPE
|| VECTOR_TYPE_P (type
))
394 p1
= build_expr_type_conversion (WANT_POINTER
, array_expr
, false);
396 if (TREE_CODE (TREE_TYPE (index_exp
)) == ARRAY_TYPE
)
399 p2
= build_expr_type_conversion (WANT_POINTER
, index_exp
, false);
401 i1
= build_expr_type_conversion (WANT_INT
| WANT_ENUM
, array_expr
,
403 i2
= build_expr_type_conversion (WANT_INT
| WANT_ENUM
, index_exp
,
406 if ((p1
&& i2
) && (i1
&& p2
))
407 error ("ambiguous conversion for array subscript");
410 array_expr
= p1
, index_exp
= i2
;
412 array_expr
= p2
, index_exp
= i1
;
415 error ("invalid types %<%T[%T]%> for array subscript",
416 type
, TREE_TYPE (index_exp
));
417 return error_mark_node
;
420 if (array_expr
== error_mark_node
|| index_exp
== error_mark_node
)
421 error ("ambiguous conversion for array subscript");
423 expr
= build_array_ref (input_location
, array_expr
, index_exp
);
425 if (processing_template_decl
&& expr
!= error_mark_node
)
426 return build_min_non_dep (ARRAY_REF
, expr
, orig_array_expr
, orig_index_exp
,
427 NULL_TREE
, NULL_TREE
);
431 /* Given the cast expression EXP, checking out its validity. Either return
432 an error_mark_node if there was an unavoidable error, return a cast to
433 void for trying to delete a pointer w/ the value 0, or return the
434 call to delete. If DOING_VEC is true, we handle things differently
435 for doing an array delete.
436 Implements ARM $5.3.4. This is called from the parser. */
439 delete_sanity (tree exp
, tree size
, bool doing_vec
, int use_global_delete
,
440 tsubst_flags_t complain
)
444 if (exp
== error_mark_node
)
447 if (processing_template_decl
)
449 t
= build_min (DELETE_EXPR
, void_type_node
, exp
, size
);
450 DELETE_EXPR_USE_GLOBAL (t
) = use_global_delete
;
451 DELETE_EXPR_USE_VEC (t
) = doing_vec
;
452 TREE_SIDE_EFFECTS (t
) = 1;
456 /* An array can't have been allocated by new, so complain. */
457 if (TREE_CODE (TREE_TYPE (exp
)) == ARRAY_TYPE
)
458 warning (0, "deleting array %q#E", exp
);
460 t
= build_expr_type_conversion (WANT_POINTER
, exp
, true);
462 if (t
== NULL_TREE
|| t
== error_mark_node
)
464 error ("type %q#T argument given to %<delete%>, expected pointer",
466 return error_mark_node
;
469 type
= TREE_TYPE (t
);
471 /* As of Valley Forge, you can delete a pointer to const. */
473 /* You can't delete functions. */
474 if (TREE_CODE (TREE_TYPE (type
)) == FUNCTION_TYPE
)
476 error ("cannot delete a function. Only pointer-to-objects are "
477 "valid arguments to %<delete%>");
478 return error_mark_node
;
481 /* Deleting ptr to void is undefined behavior [expr.delete/3]. */
482 if (VOID_TYPE_P (TREE_TYPE (type
)))
484 warning (OPT_Wdelete_incomplete
, "deleting %qT is undefined", type
);
488 /* Deleting a pointer with the value zero is valid and has no effect. */
489 if (integer_zerop (t
))
490 return build1 (NOP_EXPR
, void_type_node
, t
);
493 return build_vec_delete (t
, /*maxindex=*/NULL_TREE
,
494 sfk_deleting_destructor
,
495 use_global_delete
, complain
);
497 return build_delete (type
, t
, sfk_deleting_destructor
,
498 LOOKUP_NORMAL
, use_global_delete
,
502 /* Report an error if the indicated template declaration is not the
503 sort of thing that should be a member template. */
506 check_member_template (tree tmpl
)
510 gcc_assert (TREE_CODE (tmpl
) == TEMPLATE_DECL
);
511 decl
= DECL_TEMPLATE_RESULT (tmpl
);
513 if (TREE_CODE (decl
) == FUNCTION_DECL
514 || DECL_ALIAS_TEMPLATE_P (tmpl
)
515 || (TREE_CODE (decl
) == TYPE_DECL
516 && MAYBE_CLASS_TYPE_P (TREE_TYPE (decl
))))
518 /* The parser rejects template declarations in local classes
519 (with the exception of generic lambdas). */
520 gcc_assert (!current_function_decl
|| LAMBDA_FUNCTION_P (decl
));
521 /* The parser rejects any use of virtual in a function template. */
522 gcc_assert (!(TREE_CODE (decl
) == FUNCTION_DECL
523 && DECL_VIRTUAL_P (decl
)));
525 /* The debug-information generating code doesn't know what to do
526 with member templates. */
527 DECL_IGNORED_P (tmpl
) = 1;
529 else if (variable_template_p (tmpl
))
532 error ("template declaration of %q#D", decl
);
535 /* Return true iff TYPE is a valid Java parameter or return type. */
538 acceptable_java_type (tree type
)
540 if (type
== error_mark_node
)
543 if (VOID_TYPE_P (type
) || TYPE_FOR_JAVA (type
))
545 if (TYPE_PTR_P (type
) || TREE_CODE (type
) == REFERENCE_TYPE
)
547 type
= TREE_TYPE (type
);
548 if (TREE_CODE (type
) == RECORD_TYPE
)
551 if (! TYPE_FOR_JAVA (type
))
553 if (! CLASSTYPE_TEMPLATE_INFO (type
))
555 args
= CLASSTYPE_TI_ARGS (type
);
556 i
= TREE_VEC_LENGTH (args
);
559 type
= TREE_VEC_ELT (args
, i
);
560 if (TYPE_PTR_P (type
))
561 type
= TREE_TYPE (type
);
562 if (! TYPE_FOR_JAVA (type
))
571 /* For a METHOD in a Java class CTYPE, return true if
572 the parameter and return types are valid Java types.
573 Otherwise, print appropriate error messages, and return false. */
576 check_java_method (tree method
)
579 tree arg_types
= TYPE_ARG_TYPES (TREE_TYPE (method
));
580 tree ret_type
= TREE_TYPE (TREE_TYPE (method
));
582 if (!acceptable_java_type (ret_type
))
584 error ("Java method %qD has non-Java return type %qT",
589 arg_types
= TREE_CHAIN (arg_types
);
590 if (DECL_HAS_IN_CHARGE_PARM_P (method
))
591 arg_types
= TREE_CHAIN (arg_types
);
592 if (DECL_HAS_VTT_PARM_P (method
))
593 arg_types
= TREE_CHAIN (arg_types
);
595 for (; arg_types
!= NULL_TREE
; arg_types
= TREE_CHAIN (arg_types
))
597 tree type
= TREE_VALUE (arg_types
);
598 if (!acceptable_java_type (type
))
600 if (type
!= error_mark_node
)
601 error ("Java method %qD has non-Java parameter type %qT",
609 /* Sanity check: report error if this function FUNCTION is not
610 really a member of the class (CTYPE) it is supposed to belong to.
611 TEMPLATE_PARMS is used to specify the template parameters of a member
612 template passed as FUNCTION_DECL. If the member template is passed as a
613 TEMPLATE_DECL, it can be NULL since the parameters can be extracted
614 from the declaration. If the function is not a function template, it
616 It returns the original declaration for the function, NULL_TREE if
617 no declaration was found, error_mark_node if an error was emitted. */
620 check_classfn (tree ctype
, tree function
, tree template_parms
)
626 if (DECL_USE_TEMPLATE (function
)
627 && !(TREE_CODE (function
) == TEMPLATE_DECL
628 && DECL_TEMPLATE_SPECIALIZATION (function
))
629 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (function
)))
630 /* Since this is a specialization of a member template,
631 we're not going to find the declaration in the class.
634 struct S { template <typename T> void f(T); };
635 template <> void S::f(int);
637 we're not going to find `S::f(int)', but there's no
638 reason we should, either. We let our callers know we didn't
639 find the method, but we don't complain. */
642 /* Basic sanity check: for a template function, the template parameters
643 either were not passed, or they are the same of DECL_TEMPLATE_PARMS. */
644 if (TREE_CODE (function
) == TEMPLATE_DECL
)
647 && !comp_template_parms (template_parms
,
648 DECL_TEMPLATE_PARMS (function
)))
650 error ("template parameter lists provided don%'t match the "
651 "template parameters of %qD", function
);
652 return error_mark_node
;
654 template_parms
= DECL_TEMPLATE_PARMS (function
);
657 /* OK, is this a definition of a member template? */
658 is_template
= (template_parms
!= NULL_TREE
);
662 A destructor shall not be a member template. */
663 if (DECL_DESTRUCTOR_P (function
) && is_template
)
665 error ("destructor %qD declared as member template", function
);
666 return error_mark_node
;
669 /* We must enter the scope here, because conversion operators are
670 named by target type, and type equivalence relies on typenames
671 resolving within the scope of CTYPE. */
672 pushed_scope
= push_scope (ctype
);
673 ix
= class_method_index_for_fn (complete_type (ctype
), function
);
676 vec
<tree
, va_gc
> *methods
= CLASSTYPE_METHOD_VEC (ctype
);
677 tree fndecls
, fndecl
= 0;
679 const char *format
= NULL
;
681 for (fndecls
= (*methods
)[ix
];
682 fndecls
; fndecls
= OVL_NEXT (fndecls
))
686 fndecl
= OVL_CURRENT (fndecls
);
687 p1
= TYPE_ARG_TYPES (TREE_TYPE (function
));
688 p2
= TYPE_ARG_TYPES (TREE_TYPE (fndecl
));
690 /* We cannot simply call decls_match because this doesn't
691 work for static member functions that are pretending to
692 be methods, and because the name may have been changed by
695 /* Get rid of the this parameter on functions that become
697 if (DECL_STATIC_FUNCTION_P (fndecl
)
698 && TREE_CODE (TREE_TYPE (function
)) == METHOD_TYPE
)
699 p1
= TREE_CHAIN (p1
);
701 /* A member template definition only matches a member template
703 if (is_template
!= (TREE_CODE (fndecl
) == TEMPLATE_DECL
))
706 /* ref-qualifier or absence of same must match. */
707 if (type_memfn_rqual (TREE_TYPE (function
))
708 != type_memfn_rqual (TREE_TYPE (fndecl
)))
711 // Include constraints in the match.
712 tree c1
= get_constraints (function
);
713 tree c2
= get_constraints (fndecl
);
715 /* While finding a match, same types and params are not enough
716 if the function is versioned. Also check version ("target")
718 if (same_type_p (TREE_TYPE (TREE_TYPE (function
)),
719 TREE_TYPE (TREE_TYPE (fndecl
)))
720 && compparms (p1
, p2
)
721 && !targetm
.target_option
.function_versions (function
, fndecl
)
723 || comp_template_parms (template_parms
,
724 DECL_TEMPLATE_PARMS (fndecl
)))
725 && equivalent_constraints (c1
, c2
)
726 && (DECL_TEMPLATE_SPECIALIZATION (function
)
727 == DECL_TEMPLATE_SPECIALIZATION (fndecl
))
728 && (!DECL_TEMPLATE_SPECIALIZATION (function
)
729 || (DECL_TI_TEMPLATE (function
)
730 == DECL_TI_TEMPLATE (fndecl
))))
736 pop_scope (pushed_scope
);
737 return OVL_CURRENT (fndecls
);
740 error_at (DECL_SOURCE_LOCATION (function
),
741 "prototype for %q#D does not match any in class %qT",
743 is_conv_op
= DECL_CONV_FN_P (fndecl
);
746 ix
= CLASSTYPE_FIRST_CONVERSION_SLOT
;
747 fndecls
= (*methods
)[ix
];
750 fndecl
= OVL_CURRENT (fndecls
);
751 fndecls
= OVL_NEXT (fndecls
);
753 if (!fndecls
&& is_conv_op
)
755 if (methods
->length () > (size_t) ++ix
)
757 fndecls
= (*methods
)[ix
];
758 if (!DECL_CONV_FN_P (OVL_CURRENT (fndecls
)))
770 format
= N_("candidates are: %+#D");
772 format
= N_("candidate is: %+#D");
773 error (format
, fndecl
);
776 else if (!COMPLETE_TYPE_P (ctype
))
777 cxx_incomplete_type_error (function
, ctype
);
779 error ("no %q#D member function declared in class %qT",
783 pop_scope (pushed_scope
);
784 return error_mark_node
;
787 /* DECL is a function with vague linkage. Remember it so that at the
788 end of the translation unit we can decide whether or not to emit
792 note_vague_linkage_fn (tree decl
)
794 DECL_DEFER_OUTPUT (decl
) = 1;
795 vec_safe_push (deferred_fns
, decl
);
798 /* As above, but for variable template instantiations. */
801 note_variable_template_instantiation (tree decl
)
803 vec_safe_push (pending_statics
, decl
);
806 /* We have just processed the DECL, which is a static data member.
807 The other parameters are as for cp_finish_decl. */
810 finish_static_data_member_decl (tree decl
,
811 tree init
, bool init_const_expr_p
,
815 DECL_CONTEXT (decl
) = current_class_type
;
817 /* We cannot call pushdecl here, because that would fill in the
818 TREE_CHAIN of our decl. Instead, we modify cp_finish_decl to do
819 the right thing, namely, to put this decl out straight away. */
821 if (! processing_template_decl
)
822 vec_safe_push (pending_statics
, decl
);
824 if (LOCAL_CLASS_P (current_class_type
)
825 /* We already complained about the template definition. */
826 && !DECL_TEMPLATE_INSTANTIATION (decl
))
827 permerror (input_location
, "local class %q#T shall not have static data member %q#D",
828 current_class_type
, decl
);
830 for (tree t
= current_class_type
; TYPE_P (t
);
831 t
= CP_TYPE_CONTEXT (t
))
832 if (TYPE_ANONYMOUS_P (t
))
834 if (permerror (DECL_SOURCE_LOCATION (decl
),
835 "static data member %qD in unnamed class", decl
))
836 inform (DECL_SOURCE_LOCATION (TYPE_NAME (t
)),
837 "unnamed class defined here");
841 DECL_IN_AGGR_P (decl
) = 1;
843 if (TREE_CODE (TREE_TYPE (decl
)) == ARRAY_TYPE
844 && TYPE_DOMAIN (TREE_TYPE (decl
)) == NULL_TREE
)
845 SET_VAR_HAD_UNKNOWN_BOUND (decl
);
847 cp_finish_decl (decl
, init
, init_const_expr_p
, asmspec_tree
, flags
);
850 /* DECLARATOR and DECLSPECS correspond to a class member. The other
851 parameters are as for cp_finish_decl. Return the DECL for the
852 class member declared. */
855 grokfield (const cp_declarator
*declarator
,
856 cp_decl_specifier_seq
*declspecs
,
857 tree init
, bool init_const_expr_p
,
862 const char *asmspec
= 0;
867 && TREE_CODE (init
) == TREE_LIST
868 && TREE_VALUE (init
) == error_mark_node
869 && TREE_CHAIN (init
) == NULL_TREE
)
872 value
= grokdeclarator (declarator
, declspecs
, FIELD
, init
!= 0, &attrlist
);
873 if (! value
|| value
== error_mark_node
)
874 /* friend or constructor went bad. */
875 return error_mark_node
;
876 if (TREE_TYPE (value
) == error_mark_node
)
879 if (TREE_CODE (value
) == TYPE_DECL
&& init
)
881 error ("typedef %qD is initialized (use decltype instead)", value
);
885 /* Pass friendly classes back. */
886 if (value
== void_type_node
)
890 name
= DECL_NAME (value
);
892 if (name
!= NULL_TREE
)
894 if (TREE_CODE (name
) == TEMPLATE_ID_EXPR
)
896 error ("explicit template argument list not allowed");
897 return error_mark_node
;
900 if (IDENTIFIER_POINTER (name
)[0] == '_'
901 && ! strcmp (IDENTIFIER_POINTER (name
), "_vptr"))
902 error ("member %qD conflicts with virtual function table field name",
906 /* Stash away type declarations. */
907 if (TREE_CODE (value
) == TYPE_DECL
)
909 DECL_NONLOCAL (value
) = 1;
910 DECL_CONTEXT (value
) = current_class_type
;
916 /* If this is a typedef that names the class for linkage purposes
917 (7.1.3p8), apply any attributes directly to the type. */
918 if (OVERLOAD_TYPE_P (TREE_TYPE (value
))
919 && value
== TYPE_NAME (TYPE_MAIN_VARIANT (TREE_TYPE (value
))))
920 attrflags
= ATTR_FLAG_TYPE_IN_PLACE
;
922 cplus_decl_attributes (&value
, attrlist
, attrflags
);
925 if (decl_spec_seq_has_spec_p (declspecs
, ds_typedef
)
926 && TREE_TYPE (value
) != error_mark_node
927 && TYPE_NAME (TYPE_MAIN_VARIANT (TREE_TYPE (value
))) != value
)
928 set_underlying_type (value
);
930 /* It's important that push_template_decl below follows
931 set_underlying_type above so that the created template
932 carries the properly set type of VALUE. */
933 if (processing_template_decl
)
934 value
= push_template_decl (value
);
936 record_locally_defined_typedef (value
);
940 int friendp
= decl_spec_seq_has_spec_p (declspecs
, ds_friend
);
942 if (!friendp
&& DECL_IN_AGGR_P (value
))
944 error ("%qD is already defined in %qT", value
, DECL_CONTEXT (value
));
945 return void_type_node
;
948 if (asmspec_tree
&& asmspec_tree
!= error_mark_node
)
949 asmspec
= TREE_STRING_POINTER (asmspec_tree
);
953 if (TREE_CODE (value
) == FUNCTION_DECL
)
955 if (init
== ridpointers
[(int)RID_DELETE
])
957 DECL_DELETED_FN (value
) = 1;
958 DECL_DECLARED_INLINE_P (value
) = 1;
959 DECL_INITIAL (value
) = error_mark_node
;
961 else if (init
== ridpointers
[(int)RID_DEFAULT
])
963 if (defaultable_fn_check (value
))
965 DECL_DEFAULTED_FN (value
) = 1;
966 DECL_INITIALIZED_IN_CLASS_P (value
) = 1;
967 DECL_DECLARED_INLINE_P (value
) = 1;
970 else if (TREE_CODE (init
) == DEFAULT_ARG
)
971 error ("invalid initializer for member function %qD", value
);
972 else if (TREE_CODE (TREE_TYPE (value
)) == METHOD_TYPE
)
974 if (integer_zerop (init
))
975 DECL_PURE_VIRTUAL_P (value
) = 1;
976 else if (error_operand_p (init
))
977 ; /* An error has already been reported. */
979 error ("invalid initializer for member function %qD",
984 gcc_assert (TREE_CODE (TREE_TYPE (value
)) == FUNCTION_TYPE
);
986 error ("initializer specified for friend function %qD",
989 error ("initializer specified for static member function %qD",
993 else if (TREE_CODE (value
) == FIELD_DECL
)
994 /* C++11 NSDMI, keep going. */;
995 else if (!VAR_P (value
))
999 /* Pass friend decls back. */
1000 if ((TREE_CODE (value
) == FUNCTION_DECL
1001 || TREE_CODE (value
) == TEMPLATE_DECL
)
1002 && DECL_CONTEXT (value
) != current_class_type
)
1005 /* Need to set this before push_template_decl. */
1007 DECL_CONTEXT (value
) = current_class_type
;
1009 if (processing_template_decl
&& VAR_OR_FUNCTION_DECL_P (value
))
1011 value
= push_template_decl (value
);
1012 if (error_operand_p (value
))
1013 return error_mark_node
;
1017 cplus_decl_attributes (&value
, attrlist
, 0);
1019 if (init
&& DIRECT_LIST_INIT_P (init
))
1020 flags
= LOOKUP_NORMAL
;
1022 flags
= LOOKUP_IMPLICIT
;
1024 switch (TREE_CODE (value
))
1027 finish_static_data_member_decl (value
, init
, init_const_expr_p
,
1028 asmspec_tree
, flags
);
1033 error ("%<asm%> specifiers are not permitted on non-static data members");
1034 if (DECL_INITIAL (value
) == error_mark_node
)
1035 init
= error_mark_node
;
1036 cp_finish_decl (value
, init
, /*init_const_expr_p=*/false,
1038 DECL_IN_AGGR_P (value
) = 1;
1043 set_user_assembler_name (value
, asmspec
);
1045 cp_finish_decl (value
,
1047 /*init_const_expr_p=*/false,
1048 asmspec_tree
, flags
);
1050 /* Pass friends back this way. */
1051 if (DECL_FRIEND_P (value
))
1052 return void_type_node
;
1054 DECL_IN_AGGR_P (value
) = 1;
1063 /* Like `grokfield', but for bitfields.
1064 WIDTH is non-NULL for bit fields only, and is an INTEGER_CST node. */
1067 grokbitfield (const cp_declarator
*declarator
,
1068 cp_decl_specifier_seq
*declspecs
, tree width
,
1071 tree value
= grokdeclarator (declarator
, declspecs
, BITFIELD
, 0, &attrlist
);
1073 if (value
== error_mark_node
)
1074 return NULL_TREE
; /* friends went bad. */
1075 if (TREE_TYPE (value
) == error_mark_node
)
1078 /* Pass friendly classes back. */
1079 if (VOID_TYPE_P (value
))
1080 return void_type_node
;
1082 if (!INTEGRAL_OR_ENUMERATION_TYPE_P (TREE_TYPE (value
))
1083 && (POINTER_TYPE_P (value
)
1084 || !dependent_type_p (TREE_TYPE (value
))))
1086 error ("bit-field %qD with non-integral type", value
);
1087 return error_mark_node
;
1090 if (TREE_CODE (value
) == TYPE_DECL
)
1092 error ("cannot declare %qD to be a bit-field type", value
);
1096 /* Usually, finish_struct_1 catches bitfields with invalid types.
1097 But, in the case of bitfields with function type, we confuse
1098 ourselves into thinking they are member functions, so we must
1100 if (TREE_CODE (value
) == FUNCTION_DECL
)
1102 error ("cannot declare bit-field %qD with function type",
1107 if (DECL_IN_AGGR_P (value
))
1109 error ("%qD is already defined in the class %qT", value
,
1110 DECL_CONTEXT (value
));
1111 return void_type_node
;
1114 if (TREE_STATIC (value
))
1116 error ("static member %qD cannot be a bit-field", value
);
1119 cp_finish_decl (value
, NULL_TREE
, false, NULL_TREE
, 0);
1121 if (width
!= error_mark_node
)
1123 /* The width must be an integer type. */
1124 if (!type_dependent_expression_p (width
)
1125 && !INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (TREE_TYPE (width
)))
1126 error ("width of bit-field %qD has non-integral type %qT", value
,
1128 DECL_INITIAL (value
) = width
;
1129 SET_DECL_C_BIT_FIELD (value
);
1132 DECL_IN_AGGR_P (value
) = 1;
1135 cplus_decl_attributes (&value
, attrlist
, /*flags=*/0);
1141 /* Returns true iff ATTR is an attribute which needs to be applied at
1142 instantiation time rather than template definition time. */
1145 is_late_template_attribute (tree attr
, tree decl
)
1147 tree name
= get_attribute_name (attr
);
1148 tree args
= TREE_VALUE (attr
);
1149 const struct attribute_spec
*spec
= lookup_attribute_spec (name
);
1153 /* Unknown attribute. */
1156 /* Attribute weak handling wants to write out assembly right away. */
1157 if (is_attribute_p ("weak", name
))
1160 /* Attribute unused is applied directly, as it appertains to
1162 if (is_attribute_p ("unused", name
))
1165 /* Attribute tls_model wants to modify the symtab. */
1166 if (is_attribute_p ("tls_model", name
))
1169 /* #pragma omp declare simd attribute needs to be always deferred. */
1171 && is_attribute_p ("omp declare simd", name
))
1174 /* An attribute pack is clearly dependent. */
1175 if (args
&& PACK_EXPANSION_P (args
))
1178 /* If any of the arguments are dependent expressions, we can't evaluate
1179 the attribute until instantiation time. */
1180 for (arg
= args
; arg
; arg
= TREE_CHAIN (arg
))
1182 tree t
= TREE_VALUE (arg
);
1184 /* If the first attribute argument is an identifier, only consider
1185 second and following arguments. Attributes like mode, format,
1186 cleanup and several target specific attributes aren't late
1187 just because they have an IDENTIFIER_NODE as first argument. */
1188 if (arg
== args
&& identifier_p (t
))
1191 if (value_dependent_expression_p (t
)
1192 || type_dependent_expression_p (t
))
1196 if (TREE_CODE (decl
) == TYPE_DECL
1198 || spec
->type_required
)
1200 tree type
= TYPE_P (decl
) ? decl
: TREE_TYPE (decl
);
1202 /* We can't apply any attributes to a completely unknown type until
1203 instantiation time. */
1204 enum tree_code code
= TREE_CODE (type
);
1205 if (code
== TEMPLATE_TYPE_PARM
1206 || code
== BOUND_TEMPLATE_TEMPLATE_PARM
1207 || code
== TYPENAME_TYPE
)
1209 /* Also defer most attributes on dependent types. This is not
1210 necessary in all cases, but is the better default. */
1211 else if (dependent_type_p (type
)
1212 /* But some attributes specifically apply to templates. */
1213 && !is_attribute_p ("abi_tag", name
)
1214 && !is_attribute_p ("deprecated", name
)
1215 && !is_attribute_p ("visibility", name
))
1224 /* ATTR_P is a list of attributes. Remove any attributes which need to be
1225 applied at instantiation time and return them. If IS_DEPENDENT is true,
1226 the declaration itself is dependent, so all attributes should be applied
1227 at instantiation time. */
1230 splice_template_attributes (tree
*attr_p
, tree decl
)
1233 tree late_attrs
= NULL_TREE
;
1234 tree
*q
= &late_attrs
;
1241 if (is_late_template_attribute (*p
, decl
))
1243 ATTR_IS_DEPENDENT (*p
) = 1;
1245 *p
= TREE_CHAIN (*p
);
1246 q
= &TREE_CHAIN (*q
);
1250 p
= &TREE_CHAIN (*p
);
1256 /* Remove any late attributes from the list in ATTR_P and attach them to
1260 save_template_attributes (tree
*attr_p
, tree
*decl_p
)
1264 if (attr_p
&& *attr_p
== error_mark_node
)
1267 tree late_attrs
= splice_template_attributes (attr_p
, *decl_p
);
1271 if (DECL_P (*decl_p
))
1272 q
= &DECL_ATTRIBUTES (*decl_p
);
1274 q
= &TYPE_ATTRIBUTES (*decl_p
);
1276 tree old_attrs
= *q
;
1278 /* Merge the late attributes at the beginning with the attribute
1280 late_attrs
= merge_attributes (late_attrs
, *q
);
1283 if (!DECL_P (*decl_p
) && *decl_p
== TYPE_MAIN_VARIANT (*decl_p
))
1285 /* We've added new attributes directly to the main variant, so
1286 now we need to update all of the other variants to include
1287 these new attributes. */
1289 for (variant
= TYPE_NEXT_VARIANT (*decl_p
); variant
;
1290 variant
= TYPE_NEXT_VARIANT (variant
))
1292 gcc_assert (TYPE_ATTRIBUTES (variant
) == old_attrs
);
1293 TYPE_ATTRIBUTES (variant
) = TYPE_ATTRIBUTES (*decl_p
);
1298 /* Return true iff ATTRS are acceptable attributes to be applied in-place
1299 to a typedef which gives a previously anonymous class or enum a name for
1300 linkage purposes. */
1303 attributes_naming_typedef_ok (tree attrs
)
1305 for (; attrs
; attrs
= TREE_CHAIN (attrs
))
1307 tree name
= get_attribute_name (attrs
);
1308 if (is_attribute_p ("vector_size", name
))
1314 /* Like reconstruct_complex_type, but handle also template trees. */
1317 cp_reconstruct_complex_type (tree type
, tree bottom
)
1320 bool late_return_type_p
= false;
1322 if (TYPE_PTR_P (type
))
1324 inner
= cp_reconstruct_complex_type (TREE_TYPE (type
), bottom
);
1325 outer
= build_pointer_type_for_mode (inner
, TYPE_MODE (type
),
1326 TYPE_REF_CAN_ALIAS_ALL (type
));
1328 else if (TREE_CODE (type
) == REFERENCE_TYPE
)
1330 inner
= cp_reconstruct_complex_type (TREE_TYPE (type
), bottom
);
1331 outer
= build_reference_type_for_mode (inner
, TYPE_MODE (type
),
1332 TYPE_REF_CAN_ALIAS_ALL (type
));
1334 else if (TREE_CODE (type
) == ARRAY_TYPE
)
1336 inner
= cp_reconstruct_complex_type (TREE_TYPE (type
), bottom
);
1337 outer
= build_cplus_array_type (inner
, TYPE_DOMAIN (type
));
1338 /* Don't call cp_build_qualified_type on ARRAY_TYPEs, the
1339 element type qualification will be handled by the recursive
1340 cp_reconstruct_complex_type call and cp_build_qualified_type
1341 for ARRAY_TYPEs changes the element type. */
1344 else if (TREE_CODE (type
) == FUNCTION_TYPE
)
1346 late_return_type_p
= TYPE_HAS_LATE_RETURN_TYPE (type
);
1347 inner
= cp_reconstruct_complex_type (TREE_TYPE (type
), bottom
);
1348 outer
= build_function_type (inner
, TYPE_ARG_TYPES (type
));
1349 outer
= apply_memfn_quals (outer
,
1350 type_memfn_quals (type
),
1351 type_memfn_rqual (type
));
1353 else if (TREE_CODE (type
) == METHOD_TYPE
)
1355 late_return_type_p
= TYPE_HAS_LATE_RETURN_TYPE (type
);
1356 inner
= cp_reconstruct_complex_type (TREE_TYPE (type
), bottom
);
1357 /* The build_method_type_directly() routine prepends 'this' to argument list,
1358 so we must compensate by getting rid of it. */
1360 = build_method_type_directly
1361 (class_of_this_parm (type
), inner
,
1362 TREE_CHAIN (TYPE_ARG_TYPES (type
)));
1364 else if (TREE_CODE (type
) == OFFSET_TYPE
)
1366 inner
= cp_reconstruct_complex_type (TREE_TYPE (type
), bottom
);
1367 outer
= build_offset_type (TYPE_OFFSET_BASETYPE (type
), inner
);
1372 if (TYPE_ATTRIBUTES (type
))
1373 outer
= cp_build_type_attribute_variant (outer
, TYPE_ATTRIBUTES (type
));
1374 outer
= cp_build_qualified_type (outer
, cp_type_quals (type
));
1376 if (late_return_type_p
)
1377 TYPE_HAS_LATE_RETURN_TYPE (outer
) = 1;
1382 /* Replaces any constexpr expression that may be into the attributes
1383 arguments with their reduced value. */
1386 cp_check_const_attributes (tree attributes
)
1388 if (attributes
== error_mark_node
)
1392 for (attr
= attributes
; attr
; attr
= TREE_CHAIN (attr
))
1395 for (arg
= TREE_VALUE (attr
); arg
; arg
= TREE_CHAIN (arg
))
1397 tree expr
= TREE_VALUE (arg
);
1399 TREE_VALUE (arg
) = maybe_constant_value (expr
);
1404 /* Return true if TYPE is an OpenMP mappable type. */
1406 cp_omp_mappable_type (tree type
)
1408 /* Mappable type has to be complete. */
1409 if (type
== error_mark_node
|| !COMPLETE_TYPE_P (type
))
1411 /* Arrays have mappable type if the elements have mappable type. */
1412 while (TREE_CODE (type
) == ARRAY_TYPE
)
1413 type
= TREE_TYPE (type
);
1414 /* A mappable type cannot contain virtual members. */
1415 if (CLASS_TYPE_P (type
) && CLASSTYPE_VTABLES (type
))
1417 /* All data members must be non-static. */
1418 if (CLASS_TYPE_P (type
))
1421 for (field
= TYPE_FIELDS (type
); field
; field
= DECL_CHAIN (field
))
1424 /* All fields must have mappable types. */
1425 else if (TREE_CODE (field
) == FIELD_DECL
1426 && !cp_omp_mappable_type (TREE_TYPE (field
)))
1432 /* Like decl_attributes, but handle C++ complexity. */
1435 cplus_decl_attributes (tree
*decl
, tree attributes
, int flags
)
1437 if (*decl
== NULL_TREE
|| *decl
== void_type_node
1438 || *decl
== error_mark_node
)
1441 /* Add implicit "omp declare target" attribute if requested. */
1442 if (scope_chain
->omp_declare_target_attribute
1444 && (TREE_STATIC (*decl
) || DECL_EXTERNAL (*decl
)))
1445 || TREE_CODE (*decl
) == FUNCTION_DECL
))
1448 && DECL_CLASS_SCOPE_P (*decl
))
1449 error ("%q+D static data member inside of declare target directive",
1451 else if (!processing_template_decl
1453 && !cp_omp_mappable_type (TREE_TYPE (*decl
)))
1454 error ("%q+D in declare target directive does not have mappable type",
1457 attributes
= tree_cons (get_identifier ("omp declare target"),
1458 NULL_TREE
, attributes
);
1461 if (processing_template_decl
)
1463 if (check_for_bare_parameter_packs (attributes
))
1466 save_template_attributes (&attributes
, decl
);
1469 cp_check_const_attributes (attributes
);
1471 if (TREE_CODE (*decl
) == TEMPLATE_DECL
)
1472 decl
= &DECL_TEMPLATE_RESULT (*decl
);
1474 if (TREE_TYPE (*decl
) && TYPE_PTRMEMFUNC_P (TREE_TYPE (*decl
)))
1477 = decl_attributes (decl
, attributes
, flags
| ATTR_FLAG_FUNCTION_NEXT
);
1478 decl_attributes (&TYPE_PTRMEMFUNC_FN_TYPE_RAW (TREE_TYPE (*decl
)),
1482 decl_attributes (decl
, attributes
, flags
);
1484 if (TREE_CODE (*decl
) == TYPE_DECL
)
1485 SET_IDENTIFIER_TYPE_VALUE (DECL_NAME (*decl
), TREE_TYPE (*decl
));
1487 /* Propagate deprecation out to the template. */
1488 if (TREE_DEPRECATED (*decl
))
1489 if (tree ti
= get_template_info (*decl
))
1491 tree tmpl
= TI_TEMPLATE (ti
);
1492 tree pattern
= (TYPE_P (*decl
) ? TREE_TYPE (tmpl
)
1493 : DECL_TEMPLATE_RESULT (tmpl
));
1494 if (*decl
== pattern
)
1495 TREE_DEPRECATED (tmpl
) = true;
1499 /* Walks through the namespace- or function-scope anonymous union
1500 OBJECT, with the indicated TYPE, building appropriate VAR_DECLs.
1501 Returns one of the fields for use in the mangled name. */
1504 build_anon_union_vars (tree type
, tree object
)
1506 tree main_decl
= NULL_TREE
;
1509 /* Rather than write the code to handle the non-union case,
1510 just give an error. */
1511 if (TREE_CODE (type
) != UNION_TYPE
)
1513 error ("anonymous struct not inside named type");
1514 return error_mark_node
;
1517 for (field
= TYPE_FIELDS (type
);
1519 field
= DECL_CHAIN (field
))
1524 if (DECL_ARTIFICIAL (field
))
1526 if (TREE_CODE (field
) != FIELD_DECL
)
1528 permerror (DECL_SOURCE_LOCATION (field
),
1529 "%q#D invalid; an anonymous union can only "
1530 "have non-static data members", field
);
1534 if (TREE_PRIVATE (field
))
1535 permerror (DECL_SOURCE_LOCATION (field
),
1536 "private member %q#D in anonymous union", field
);
1537 else if (TREE_PROTECTED (field
))
1538 permerror (DECL_SOURCE_LOCATION (field
),
1539 "protected member %q#D in anonymous union", field
);
1541 if (processing_template_decl
)
1542 ref
= build_min_nt_loc (UNKNOWN_LOCATION
, COMPONENT_REF
, object
,
1543 DECL_NAME (field
), NULL_TREE
);
1545 ref
= build_class_member_access_expr (object
, field
, NULL_TREE
,
1546 false, tf_warning_or_error
);
1548 if (DECL_NAME (field
))
1552 decl
= build_decl (input_location
,
1553 VAR_DECL
, DECL_NAME (field
), TREE_TYPE (field
));
1554 DECL_ANON_UNION_VAR_P (decl
) = 1;
1555 DECL_ARTIFICIAL (decl
) = 1;
1557 base
= get_base_address (object
);
1558 TREE_PUBLIC (decl
) = TREE_PUBLIC (base
);
1559 TREE_STATIC (decl
) = TREE_STATIC (base
);
1560 DECL_EXTERNAL (decl
) = DECL_EXTERNAL (base
);
1562 SET_DECL_VALUE_EXPR (decl
, ref
);
1563 DECL_HAS_VALUE_EXPR_P (decl
) = 1;
1565 decl
= pushdecl (decl
);
1567 else if (ANON_AGGR_TYPE_P (TREE_TYPE (field
)))
1568 decl
= build_anon_union_vars (TREE_TYPE (field
), ref
);
1572 if (main_decl
== NULL_TREE
)
1579 /* Finish off the processing of a UNION_TYPE structure. If the union is an
1580 anonymous union, then all members must be laid out together. PUBLIC_P
1581 is nonzero if this union is not declared static. */
1584 finish_anon_union (tree anon_union_decl
)
1590 if (anon_union_decl
== error_mark_node
)
1593 type
= TREE_TYPE (anon_union_decl
);
1594 public_p
= TREE_PUBLIC (anon_union_decl
);
1596 /* The VAR_DECL's context is the same as the TYPE's context. */
1597 DECL_CONTEXT (anon_union_decl
) = DECL_CONTEXT (TYPE_NAME (type
));
1599 if (TYPE_FIELDS (type
) == NULL_TREE
)
1604 error ("namespace-scope anonymous aggregates must be static");
1608 main_decl
= build_anon_union_vars (type
, anon_union_decl
);
1609 if (main_decl
== error_mark_node
)
1611 if (main_decl
== NULL_TREE
)
1613 warning (0, "anonymous union with no members");
1617 if (!processing_template_decl
)
1619 /* Use main_decl to set the mangled name. */
1620 DECL_NAME (anon_union_decl
) = DECL_NAME (main_decl
);
1621 maybe_commonize_var (anon_union_decl
);
1622 if (TREE_STATIC (anon_union_decl
) || DECL_EXTERNAL (anon_union_decl
))
1623 mangle_decl (anon_union_decl
);
1624 DECL_NAME (anon_union_decl
) = NULL_TREE
;
1627 pushdecl (anon_union_decl
);
1628 cp_finish_decl (anon_union_decl
, NULL_TREE
, false, NULL_TREE
, 0);
1631 /* Auxiliary functions to make type signatures for
1632 `operator new' and `operator delete' correspond to
1633 what compiler will be expecting. */
1636 coerce_new_type (tree type
)
1639 tree args
= TYPE_ARG_TYPES (type
);
1641 gcc_assert (TREE_CODE (type
) == FUNCTION_TYPE
);
1643 if (!same_type_p (TREE_TYPE (type
), ptr_type_node
))
1646 error ("%<operator new%> must return type %qT", ptr_type_node
);
1649 if (args
&& args
!= void_list_node
)
1651 if (TREE_PURPOSE (args
))
1653 /* [basic.stc.dynamic.allocation]
1655 The first parameter shall not have an associated default
1657 error ("the first parameter of %<operator new%> cannot "
1658 "have a default argument");
1659 /* Throw away the default argument. */
1660 TREE_PURPOSE (args
) = NULL_TREE
;
1663 if (!same_type_p (TREE_VALUE (args
), size_type_node
))
1666 args
= TREE_CHAIN (args
);
1673 permerror (input_location
, "%<operator new%> takes type %<size_t%> (%qT) "
1674 "as first parameter", size_type_node
);
1679 args
= tree_cons (NULL_TREE
, size_type_node
, args
);
1682 type
= build_exception_variant
1683 (build_function_type (ptr_type_node
, args
),
1684 TYPE_RAISES_EXCEPTIONS (type
));
1692 coerce_delete_type (tree type
)
1695 tree args
= TYPE_ARG_TYPES (type
);
1697 gcc_assert (TREE_CODE (type
) == FUNCTION_TYPE
);
1699 if (!same_type_p (TREE_TYPE (type
), void_type_node
))
1702 error ("%<operator delete%> must return type %qT", void_type_node
);
1705 if (!args
|| args
== void_list_node
1706 || !same_type_p (TREE_VALUE (args
), ptr_type_node
))
1709 if (args
&& args
!= void_list_node
)
1710 args
= TREE_CHAIN (args
);
1711 error ("%<operator delete%> takes type %qT as first parameter",
1717 args
= tree_cons (NULL_TREE
, ptr_type_node
, args
);
1720 type
= build_exception_variant
1721 (build_function_type (void_type_node
, args
),
1722 TYPE_RAISES_EXCEPTIONS (type
));
1730 /* DECL is a VAR_DECL for a vtable: walk through the entries in the vtable
1731 and mark them as needed. */
1734 mark_vtable_entries (tree decl
)
1737 unsigned HOST_WIDE_INT idx
;
1739 /* It's OK for the vtable to refer to deprecated virtual functions. */
1740 warning_sentinel
w(warn_deprecated_decl
);
1742 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (DECL_INITIAL (decl
)),
1747 STRIP_NOPS (fnaddr
);
1749 if (TREE_CODE (fnaddr
) != ADDR_EXPR
1750 && TREE_CODE (fnaddr
) != FDESC_EXPR
)
1751 /* This entry is an offset: a virtual base class offset, a
1752 virtual call offset, an RTTI offset, etc. */
1755 fn
= TREE_OPERAND (fnaddr
, 0);
1756 TREE_ADDRESSABLE (fn
) = 1;
1757 /* When we don't have vcall offsets, we output thunks whenever
1758 we output the vtables that contain them. With vcall offsets,
1759 we know all the thunks we'll need when we emit a virtual
1760 function, so we emit the thunks there instead. */
1761 if (DECL_THUNK_P (fn
))
1762 use_thunk (fn
, /*emit_p=*/0);
1767 /* Set DECL up to have the closest approximation of "initialized common"
1768 linkage available. */
1771 comdat_linkage (tree decl
)
1774 make_decl_one_only (decl
, cxx_comdat_group (decl
));
1775 else if (TREE_CODE (decl
) == FUNCTION_DECL
1776 || (VAR_P (decl
) && DECL_ARTIFICIAL (decl
)))
1777 /* We can just emit function and compiler-generated variables
1778 statically; having multiple copies is (for the most part) only
1781 There are two correctness issues, however: the address of a
1782 template instantiation with external linkage should be the
1783 same, independent of what translation unit asks for the
1784 address, and this will not hold when we emit multiple copies of
1785 the function. However, there's little else we can do.
1787 Also, by default, the typeinfo implementation assumes that
1788 there will be only one copy of the string used as the name for
1789 each type. Therefore, if weak symbols are unavailable, the
1790 run-time library should perform a more conservative check; it
1791 should perform a string comparison, rather than an address
1793 TREE_PUBLIC (decl
) = 0;
1796 /* Static data member template instantiations, however, cannot
1797 have multiple copies. */
1798 if (DECL_INITIAL (decl
) == 0
1799 || DECL_INITIAL (decl
) == error_mark_node
)
1800 DECL_COMMON (decl
) = 1;
1801 else if (EMPTY_CONSTRUCTOR_P (DECL_INITIAL (decl
)))
1803 DECL_COMMON (decl
) = 1;
1804 DECL_INITIAL (decl
) = error_mark_node
;
1806 else if (!DECL_EXPLICIT_INSTANTIATION (decl
))
1808 /* We can't do anything useful; leave vars for explicit
1810 DECL_EXTERNAL (decl
) = 1;
1811 DECL_NOT_REALLY_EXTERN (decl
) = 0;
1815 DECL_COMDAT (decl
) = 1;
1818 /* For win32 we also want to put explicit instantiations in
1819 linkonce sections, so that they will be merged with implicit
1820 instantiations; otherwise we get duplicate symbol errors.
1821 For Darwin we do not want explicit instantiations to be
1825 maybe_make_one_only (tree decl
)
1827 /* We used to say that this was not necessary on targets that support weak
1828 symbols, because the implicit instantiations will defer to the explicit
1829 one. However, that's not actually the case in SVR4; a strong definition
1830 after a weak one is an error. Also, not making explicit
1831 instantiations one_only means that we can end up with two copies of
1832 some template instantiations. */
1836 /* We can't set DECL_COMDAT on functions, or cp_finish_file will think
1837 we can get away with not emitting them if they aren't used. We need
1838 to for variables so that cp_finish_decl will update their linkage,
1839 because their DECL_INITIAL may not have been set properly yet. */
1841 if (!TARGET_WEAK_NOT_IN_ARCHIVE_TOC
1842 || (! DECL_EXPLICIT_INSTANTIATION (decl
)
1843 && ! DECL_TEMPLATE_SPECIALIZATION (decl
)))
1845 make_decl_one_only (decl
, cxx_comdat_group (decl
));
1849 varpool_node
*node
= varpool_node::get_create (decl
);
1850 DECL_COMDAT (decl
) = 1;
1851 /* Mark it needed so we don't forget to emit it. */
1852 node
->forced_by_abi
= true;
1853 TREE_USED (decl
) = 1;
1858 /* Returns true iff DECL, a FUNCTION_DECL or VAR_DECL, has vague linkage.
1859 This predicate will give the right answer during parsing of the
1860 function, which other tests may not. */
1863 vague_linkage_p (tree decl
)
1865 if (!TREE_PUBLIC (decl
))
1867 gcc_checking_assert (!DECL_COMDAT (decl
));
1870 /* Unfortunately, import_export_decl has not always been called
1871 before the function is processed, so we cannot simply check
1873 if (DECL_COMDAT (decl
)
1874 || (TREE_CODE (decl
) == FUNCTION_DECL
1875 && DECL_DECLARED_INLINE_P (decl
))
1876 || (DECL_LANG_SPECIFIC (decl
)
1877 && DECL_TEMPLATE_INSTANTIATION (decl
)))
1879 else if (DECL_FUNCTION_SCOPE_P (decl
))
1880 /* A local static in an inline effectively has vague linkage. */
1881 return (TREE_STATIC (decl
)
1882 && vague_linkage_p (DECL_CONTEXT (decl
)));
1887 /* Determine whether or not we want to specifically import or export CTYPE,
1888 using various heuristics. */
1891 import_export_class (tree ctype
)
1893 /* -1 for imported, 1 for exported. */
1894 int import_export
= 0;
1896 /* It only makes sense to call this function at EOF. The reason is
1897 that this function looks at whether or not the first non-inline
1898 non-abstract virtual member function has been defined in this
1899 translation unit. But, we can't possibly know that until we've
1900 seen the entire translation unit. */
1901 gcc_assert (at_eof
);
1903 if (CLASSTYPE_INTERFACE_KNOWN (ctype
))
1906 /* If MULTIPLE_SYMBOL_SPACES is set and we saw a #pragma interface,
1907 we will have CLASSTYPE_INTERFACE_ONLY set but not
1908 CLASSTYPE_INTERFACE_KNOWN. In that case, we don't want to use this
1909 heuristic because someone will supply a #pragma implementation
1910 elsewhere, and deducing it here would produce a conflict. */
1911 if (CLASSTYPE_INTERFACE_ONLY (ctype
))
1914 if (lookup_attribute ("dllimport", TYPE_ATTRIBUTES (ctype
)))
1916 else if (lookup_attribute ("dllexport", TYPE_ATTRIBUTES (ctype
)))
1918 else if (CLASSTYPE_IMPLICIT_INSTANTIATION (ctype
)
1919 && !flag_implicit_templates
)
1920 /* For a template class, without -fimplicit-templates, check the
1921 repository. If the virtual table is assigned to this
1922 translation unit, then export the class; otherwise, import
1924 import_export
= repo_export_class_p (ctype
) ? 1 : -1;
1925 else if (TYPE_POLYMORPHIC_P (ctype
))
1927 /* The ABI specifies that the virtual table and associated
1928 information are emitted with the key method, if any. */
1929 tree method
= CLASSTYPE_KEY_METHOD (ctype
);
1930 /* If weak symbol support is not available, then we must be
1931 careful not to emit the vtable when the key function is
1932 inline. An inline function can be defined in multiple
1933 translation units. If we were to emit the vtable in each
1934 translation unit containing a definition, we would get
1935 multiple definition errors at link-time. */
1936 if (method
&& (flag_weak
|| ! DECL_DECLARED_INLINE_P (method
)))
1937 import_export
= (DECL_REALLY_EXTERN (method
) ? -1 : 1);
1940 /* When MULTIPLE_SYMBOL_SPACES is set, we cannot count on seeing
1941 a definition anywhere else. */
1942 if (MULTIPLE_SYMBOL_SPACES
&& import_export
== -1)
1945 /* Allow back ends the chance to overrule the decision. */
1946 if (targetm
.cxx
.import_export_class
)
1947 import_export
= targetm
.cxx
.import_export_class (ctype
, import_export
);
1951 SET_CLASSTYPE_INTERFACE_KNOWN (ctype
);
1952 CLASSTYPE_INTERFACE_ONLY (ctype
) = (import_export
< 0);
1956 /* Return true if VAR has already been provided to the back end; in that
1957 case VAR should not be modified further by the front end. */
1959 var_finalized_p (tree var
)
1961 return varpool_node::get_create (var
)->definition
;
1964 /* DECL is a VAR_DECL or FUNCTION_DECL which, for whatever reason,
1965 must be emitted in this translation unit. Mark it as such. */
1968 mark_needed (tree decl
)
1970 TREE_USED (decl
) = 1;
1971 if (TREE_CODE (decl
) == FUNCTION_DECL
)
1973 /* Extern inline functions don't become needed when referenced.
1974 If we know a method will be emitted in other TU and no new
1975 functions can be marked reachable, just use the external
1977 struct cgraph_node
*node
= cgraph_node::get_create (decl
);
1978 node
->forced_by_abi
= true;
1980 /* #pragma interface and -frepo code can call mark_needed for
1981 maybe-in-charge 'tors; mark the clones as well. */
1983 FOR_EACH_CLONE (clone
, decl
)
1984 mark_needed (clone
);
1986 else if (VAR_P (decl
))
1988 varpool_node
*node
= varpool_node::get_create (decl
);
1989 /* C++ frontend use mark_decl_references to force COMDAT variables
1990 to be output that might appear dead otherwise. */
1991 node
->forced_by_abi
= true;
1995 /* DECL is either a FUNCTION_DECL or a VAR_DECL. This function
1996 returns true if a definition of this entity should be provided in
1997 this object file. Callers use this function to determine whether
1998 or not to let the back end know that a definition of DECL is
1999 available in this translation unit. */
2002 decl_needed_p (tree decl
)
2004 gcc_assert (VAR_OR_FUNCTION_DECL_P (decl
));
2005 /* This function should only be called at the end of the translation
2006 unit. We cannot be sure of whether or not something will be
2007 COMDAT until that point. */
2008 gcc_assert (at_eof
);
2010 /* All entities with external linkage that are not COMDAT/EXTERN should be
2011 emitted; they may be referred to from other object files. */
2012 if (TREE_PUBLIC (decl
) && !DECL_COMDAT (decl
) && !DECL_REALLY_EXTERN (decl
))
2014 /* Functions marked "dllexport" must be emitted so that they are
2015 visible to other DLLs. */
2016 if (flag_keep_inline_dllexport
2017 && lookup_attribute ("dllexport", DECL_ATTRIBUTES (decl
)))
2020 /* When not optimizing, do not bother to produce definitions for extern
2022 if (DECL_REALLY_EXTERN (decl
)
2023 && ((TREE_CODE (decl
) != FUNCTION_DECL
2025 || (TREE_CODE (decl
) == FUNCTION_DECL
2026 && !opt_for_fn (decl
, optimize
)))
2027 && !lookup_attribute ("always_inline", decl
))
2030 /* If this entity was used, let the back end see it; it will decide
2031 whether or not to emit it into the object file. */
2032 if (TREE_USED (decl
))
2034 /* Virtual functions might be needed for devirtualization. */
2035 if (flag_devirtualize
2036 && TREE_CODE (decl
) == FUNCTION_DECL
2037 && DECL_VIRTUAL_P (decl
))
2039 /* Otherwise, DECL does not need to be emitted -- yet. A subsequent
2040 reference to DECL might cause it to be emitted later. */
2044 /* If necessary, write out the vtables for the dynamic class CTYPE.
2045 Returns true if any vtables were emitted. */
2048 maybe_emit_vtables (tree ctype
)
2053 varpool_node
*current
= NULL
, *last
= NULL
;
2055 /* If the vtables for this class have already been emitted there is
2056 nothing more to do. */
2057 primary_vtbl
= CLASSTYPE_VTABLES (ctype
);
2058 if (var_finalized_p (primary_vtbl
))
2060 /* Ignore dummy vtables made by get_vtable_decl. */
2061 if (TREE_TYPE (primary_vtbl
) == void_type_node
)
2064 /* On some targets, we cannot determine the key method until the end
2065 of the translation unit -- which is when this function is
2067 if (!targetm
.cxx
.key_method_may_be_inline ())
2068 determine_key_method (ctype
);
2070 /* See if any of the vtables are needed. */
2071 for (vtbl
= CLASSTYPE_VTABLES (ctype
); vtbl
; vtbl
= DECL_CHAIN (vtbl
))
2073 import_export_decl (vtbl
);
2074 if (DECL_NOT_REALLY_EXTERN (vtbl
) && decl_needed_p (vtbl
))
2079 /* If the references to this class' vtables are optimized away,
2080 still emit the appropriate debugging information. See
2082 if (DECL_COMDAT (primary_vtbl
)
2083 && CLASSTYPE_DEBUG_REQUESTED (ctype
))
2084 note_debug_info_needed (ctype
);
2088 /* The ABI requires that we emit all of the vtables if we emit any
2090 for (vtbl
= CLASSTYPE_VTABLES (ctype
); vtbl
; vtbl
= DECL_CHAIN (vtbl
))
2092 /* Mark entities references from the virtual table as used. */
2093 mark_vtable_entries (vtbl
);
2095 if (TREE_TYPE (DECL_INITIAL (vtbl
)) == 0)
2097 vec
<tree
, va_gc
> *cleanups
= NULL
;
2098 tree expr
= store_init_value (vtbl
, DECL_INITIAL (vtbl
), &cleanups
,
2101 /* It had better be all done at compile-time. */
2102 gcc_assert (!expr
&& !cleanups
);
2106 DECL_EXTERNAL (vtbl
) = 0;
2107 rest_of_decl_compilation (vtbl
, 1, 1);
2109 /* Because we're only doing syntax-checking, we'll never end up
2110 actually marking the variable as written. */
2111 if (flag_syntax_only
)
2112 TREE_ASM_WRITTEN (vtbl
) = 1;
2113 else if (DECL_ONE_ONLY (vtbl
))
2115 current
= varpool_node::get_create (vtbl
);
2117 current
->add_to_same_comdat_group (last
);
2122 /* Since we're writing out the vtable here, also write the debug
2124 note_debug_info_needed (ctype
);
2129 /* A special return value from type_visibility meaning internal
2132 enum { VISIBILITY_ANON
= VISIBILITY_INTERNAL
+1 };
2134 /* walk_tree helper function for type_visibility. */
2137 min_vis_r (tree
*tp
, int *walk_subtrees
, void *data
)
2139 int *vis_p
= (int *)data
;
2144 else if (OVERLOAD_TYPE_P (*tp
)
2145 && !TREE_PUBLIC (TYPE_MAIN_DECL (*tp
)))
2147 *vis_p
= VISIBILITY_ANON
;
2150 else if (CLASS_TYPE_P (*tp
)
2151 && CLASSTYPE_VISIBILITY (*tp
) > *vis_p
)
2152 *vis_p
= CLASSTYPE_VISIBILITY (*tp
);
2156 /* Returns the visibility of TYPE, which is the minimum visibility of its
2160 type_visibility (tree type
)
2162 int vis
= VISIBILITY_DEFAULT
;
2163 cp_walk_tree_without_duplicates (&type
, min_vis_r
, &vis
);
2167 /* Limit the visibility of DECL to VISIBILITY, if not explicitly
2168 specified (or if VISIBILITY is static). If TMPL is true, this
2169 constraint is for a template argument, and takes precedence
2170 over explicitly-specified visibility on the template. */
2173 constrain_visibility (tree decl
, int visibility
, bool tmpl
)
2175 if (visibility
== VISIBILITY_ANON
)
2177 /* extern "C" declarations aren't affected by the anonymous
2179 if (!DECL_EXTERN_C_P (decl
))
2181 TREE_PUBLIC (decl
) = 0;
2182 DECL_WEAK (decl
) = 0;
2183 DECL_COMMON (decl
) = 0;
2184 DECL_COMDAT (decl
) = false;
2185 if (VAR_OR_FUNCTION_DECL_P (decl
))
2187 struct symtab_node
*snode
= symtab_node::get (decl
);
2190 snode
->set_comdat_group (NULL
);
2192 DECL_INTERFACE_KNOWN (decl
) = 1;
2193 if (DECL_LANG_SPECIFIC (decl
))
2194 DECL_NOT_REALLY_EXTERN (decl
) = 1;
2197 else if (visibility
> DECL_VISIBILITY (decl
)
2198 && (tmpl
|| !DECL_VISIBILITY_SPECIFIED (decl
)))
2200 DECL_VISIBILITY (decl
) = (enum symbol_visibility
) visibility
;
2201 /* This visibility was not specified. */
2202 DECL_VISIBILITY_SPECIFIED (decl
) = false;
2206 /* Constrain the visibility of DECL based on the visibility of its template
2210 constrain_visibility_for_template (tree decl
, tree targs
)
2212 /* If this is a template instantiation, check the innermost
2213 template args for visibility constraints. The outer template
2214 args are covered by the class check. */
2215 tree args
= INNERMOST_TEMPLATE_ARGS (targs
);
2217 for (i
= TREE_VEC_LENGTH (args
); i
> 0; --i
)
2221 tree arg
= TREE_VEC_ELT (args
, i
-1);
2223 vis
= type_visibility (arg
);
2226 if (REFERENCE_REF_P (arg
))
2227 arg
= TREE_OPERAND (arg
, 0);
2228 if (TREE_TYPE (arg
))
2230 if (TREE_CODE (arg
) == ADDR_EXPR
)
2231 arg
= TREE_OPERAND (arg
, 0);
2232 if (VAR_OR_FUNCTION_DECL_P (arg
))
2234 if (! TREE_PUBLIC (arg
))
2235 vis
= VISIBILITY_ANON
;
2237 vis
= DECL_VISIBILITY (arg
);
2241 constrain_visibility (decl
, vis
, true);
2245 /* Like c_determine_visibility, but with additional C++-specific
2248 Function-scope entities can rely on the function's visibility because
2249 it is set in start_preparsed_function.
2251 Class-scope entities cannot rely on the class's visibility until the end
2252 of the enclosing class definition.
2254 Note that because namespaces have multiple independent definitions,
2255 namespace visibility is handled elsewhere using the #pragma visibility
2256 machinery rather than by decorating the namespace declaration.
2258 The goal is for constraints from the type to give a diagnostic, and
2259 other constraints to be applied silently. */
2262 determine_visibility (tree decl
)
2264 tree class_type
= NULL_TREE
;
2266 bool orig_visibility_specified
;
2267 enum symbol_visibility orig_visibility
;
2269 /* Remember that all decls get VISIBILITY_DEFAULT when built. */
2271 /* Only relevant for names with external linkage. */
2272 if (!TREE_PUBLIC (decl
))
2275 /* Cloned constructors and destructors get the same visibility as
2276 the underlying function. That should be set up in
2277 maybe_clone_body. */
2278 gcc_assert (!DECL_CLONED_FUNCTION_P (decl
));
2280 orig_visibility_specified
= DECL_VISIBILITY_SPECIFIED (decl
);
2281 orig_visibility
= DECL_VISIBILITY (decl
);
2283 if (TREE_CODE (decl
) == TYPE_DECL
)
2285 if (CLASS_TYPE_P (TREE_TYPE (decl
)))
2286 use_template
= CLASSTYPE_USE_TEMPLATE (TREE_TYPE (decl
));
2287 else if (TYPE_TEMPLATE_INFO (TREE_TYPE (decl
)))
2292 else if (DECL_LANG_SPECIFIC (decl
))
2293 use_template
= DECL_USE_TEMPLATE (decl
);
2297 /* If DECL is a member of a class, visibility specifiers on the
2298 class can influence the visibility of the DECL. */
2299 if (DECL_CLASS_SCOPE_P (decl
))
2300 class_type
= DECL_CONTEXT (decl
);
2303 /* Not a class member. */
2305 /* Virtual tables have DECL_CONTEXT set to their associated class,
2306 so they are automatically handled above. */
2307 gcc_assert (!VAR_P (decl
)
2308 || !DECL_VTABLE_OR_VTT_P (decl
));
2310 if (DECL_FUNCTION_SCOPE_P (decl
) && ! DECL_VISIBILITY_SPECIFIED (decl
))
2312 /* Local statics and classes get the visibility of their
2313 containing function by default, except that
2314 -fvisibility-inlines-hidden doesn't affect them. */
2315 tree fn
= DECL_CONTEXT (decl
);
2316 if (DECL_VISIBILITY_SPECIFIED (fn
))
2318 DECL_VISIBILITY (decl
) = DECL_VISIBILITY (fn
);
2319 DECL_VISIBILITY_SPECIFIED (decl
) =
2320 DECL_VISIBILITY_SPECIFIED (fn
);
2324 if (DECL_CLASS_SCOPE_P (fn
))
2325 determine_visibility_from_class (decl
, DECL_CONTEXT (fn
));
2326 else if (determine_hidden_inline (fn
))
2328 DECL_VISIBILITY (decl
) = default_visibility
;
2329 DECL_VISIBILITY_SPECIFIED (decl
) =
2330 visibility_options
.inpragma
;
2334 DECL_VISIBILITY (decl
) = DECL_VISIBILITY (fn
);
2335 DECL_VISIBILITY_SPECIFIED (decl
) =
2336 DECL_VISIBILITY_SPECIFIED (fn
);
2340 /* Local classes in templates have CLASSTYPE_USE_TEMPLATE set,
2341 but have no TEMPLATE_INFO, so don't try to check it. */
2344 else if (VAR_P (decl
) && DECL_TINFO_P (decl
)
2345 && flag_visibility_ms_compat
)
2347 /* Under -fvisibility-ms-compat, types are visible by default,
2348 even though their contents aren't. */
2349 tree underlying_type
= TREE_TYPE (DECL_NAME (decl
));
2350 int underlying_vis
= type_visibility (underlying_type
);
2351 if (underlying_vis
== VISIBILITY_ANON
2352 || (CLASS_TYPE_P (underlying_type
)
2353 && CLASSTYPE_VISIBILITY_SPECIFIED (underlying_type
)))
2354 constrain_visibility (decl
, underlying_vis
, false);
2356 DECL_VISIBILITY (decl
) = VISIBILITY_DEFAULT
;
2358 else if (VAR_P (decl
) && DECL_TINFO_P (decl
))
2360 /* tinfo visibility is based on the type it's for. */
2361 constrain_visibility
2362 (decl
, type_visibility (TREE_TYPE (DECL_NAME (decl
))), false);
2364 /* Give the target a chance to override the visibility associated
2366 if (TREE_PUBLIC (decl
)
2367 && !DECL_REALLY_EXTERN (decl
)
2368 && CLASS_TYPE_P (TREE_TYPE (DECL_NAME (decl
)))
2369 && !CLASSTYPE_VISIBILITY_SPECIFIED (TREE_TYPE (DECL_NAME (decl
))))
2370 targetm
.cxx
.determine_class_data_visibility (decl
);
2372 else if (use_template
)
2373 /* Template instantiations and specializations get visibility based
2374 on their template unless they override it with an attribute. */;
2375 else if (! DECL_VISIBILITY_SPECIFIED (decl
))
2377 if (determine_hidden_inline (decl
))
2378 DECL_VISIBILITY (decl
) = VISIBILITY_HIDDEN
;
2381 /* Set default visibility to whatever the user supplied with
2382 #pragma GCC visibility or a namespace visibility attribute. */
2383 DECL_VISIBILITY (decl
) = default_visibility
;
2384 DECL_VISIBILITY_SPECIFIED (decl
) = visibility_options
.inpragma
;
2391 /* If the specialization doesn't specify visibility, use the
2392 visibility from the template. */
2393 tree tinfo
= get_template_info (decl
);
2394 tree args
= TI_ARGS (tinfo
);
2395 tree attribs
= (TREE_CODE (decl
) == TYPE_DECL
2396 ? TYPE_ATTRIBUTES (TREE_TYPE (decl
))
2397 : DECL_ATTRIBUTES (decl
));
2399 if (args
!= error_mark_node
)
2401 tree pattern
= DECL_TEMPLATE_RESULT (TI_TEMPLATE (tinfo
));
2403 if (!DECL_VISIBILITY_SPECIFIED (decl
))
2405 if (!DECL_VISIBILITY_SPECIFIED (pattern
)
2406 && determine_hidden_inline (decl
))
2407 DECL_VISIBILITY (decl
) = VISIBILITY_HIDDEN
;
2410 DECL_VISIBILITY (decl
) = DECL_VISIBILITY (pattern
);
2411 DECL_VISIBILITY_SPECIFIED (decl
)
2412 = DECL_VISIBILITY_SPECIFIED (pattern
);
2417 /* Template argument visibility outweighs #pragma or namespace
2418 visibility, but not an explicit attribute. */
2419 && !lookup_attribute ("visibility", attribs
))
2421 int depth
= TMPL_ARGS_DEPTH (args
);
2422 if (DECL_VISIBILITY_SPECIFIED (decl
))
2424 /* A class template member with explicit visibility
2425 overrides the class visibility, so we need to apply
2426 all the levels of template args directly. */
2428 for (i
= 1; i
<= depth
; ++i
)
2430 tree lev
= TMPL_ARGS_LEVEL (args
, i
);
2431 constrain_visibility_for_template (decl
, lev
);
2434 else if (PRIMARY_TEMPLATE_P (TI_TEMPLATE (tinfo
)))
2435 /* Limit visibility based on its template arguments. */
2436 constrain_visibility_for_template (decl
, args
);
2442 determine_visibility_from_class (decl
, class_type
);
2444 if (decl_anon_ns_mem_p (decl
))
2445 /* Names in an anonymous namespace get internal linkage.
2446 This might change once we implement export. */
2447 constrain_visibility (decl
, VISIBILITY_ANON
, false);
2448 else if (TREE_CODE (decl
) != TYPE_DECL
)
2450 /* Propagate anonymity from type to decl. */
2451 int tvis
= type_visibility (TREE_TYPE (decl
));
2452 if (tvis
== VISIBILITY_ANON
2453 || ! DECL_VISIBILITY_SPECIFIED (decl
))
2454 constrain_visibility (decl
, tvis
, false);
2456 else if (no_linkage_check (TREE_TYPE (decl
), /*relaxed_p=*/true))
2457 /* DR 757: A type without linkage shall not be used as the type of a
2458 variable or function with linkage, unless
2459 o the variable or function has extern "C" linkage (7.5 [dcl.link]), or
2460 o the variable or function is not used (3.2 [basic.def.odr]) or is
2461 defined in the same translation unit.
2463 Since non-extern "C" decls need to be defined in the same
2464 translation unit, we can make the type internal. */
2465 constrain_visibility (decl
, VISIBILITY_ANON
, false);
2467 /* If visibility changed and DECL already has DECL_RTL, ensure
2468 symbol flags are updated. */
2469 if ((DECL_VISIBILITY (decl
) != orig_visibility
2470 || DECL_VISIBILITY_SPECIFIED (decl
) != orig_visibility_specified
)
2471 && ((VAR_P (decl
) && TREE_STATIC (decl
))
2472 || TREE_CODE (decl
) == FUNCTION_DECL
)
2473 && DECL_RTL_SET_P (decl
))
2474 make_decl_rtl (decl
);
2477 /* By default, static data members and function members receive
2478 the visibility of their containing class. */
2481 determine_visibility_from_class (tree decl
, tree class_type
)
2483 if (DECL_VISIBILITY_SPECIFIED (decl
))
2486 if (determine_hidden_inline (decl
))
2487 DECL_VISIBILITY (decl
) = VISIBILITY_HIDDEN
;
2490 /* Default to the class visibility. */
2491 DECL_VISIBILITY (decl
) = CLASSTYPE_VISIBILITY (class_type
);
2492 DECL_VISIBILITY_SPECIFIED (decl
)
2493 = CLASSTYPE_VISIBILITY_SPECIFIED (class_type
);
2496 /* Give the target a chance to override the visibility associated
2499 && (DECL_TINFO_P (decl
)
2500 || (DECL_VTABLE_OR_VTT_P (decl
)
2501 /* Construction virtual tables are not exported because
2502 they cannot be referred to from other object files;
2503 their name is not standardized by the ABI. */
2504 && !DECL_CONSTRUCTION_VTABLE_P (decl
)))
2505 && TREE_PUBLIC (decl
)
2506 && !DECL_REALLY_EXTERN (decl
)
2507 && !CLASSTYPE_VISIBILITY_SPECIFIED (class_type
))
2508 targetm
.cxx
.determine_class_data_visibility (decl
);
2511 /* Returns true iff DECL is an inline that should get hidden visibility
2512 because of -fvisibility-inlines-hidden. */
2515 determine_hidden_inline (tree decl
)
2517 return (visibility_options
.inlines_hidden
2518 /* Don't do this for inline templates; specializations might not be
2519 inline, and we don't want them to inherit the hidden
2520 visibility. We'll set it here for all inline instantiations. */
2521 && !processing_template_decl
2522 && TREE_CODE (decl
) == FUNCTION_DECL
2523 && DECL_DECLARED_INLINE_P (decl
)
2524 && (! DECL_LANG_SPECIFIC (decl
)
2525 || ! DECL_EXPLICIT_INSTANTIATION (decl
)));
2528 /* Constrain the visibility of a class TYPE based on the visibility of its
2529 field types. Warn if any fields require lesser visibility. */
2532 constrain_class_visibility (tree type
)
2538 int vis
= type_visibility (type
);
2540 if (vis
== VISIBILITY_ANON
2541 || DECL_IN_SYSTEM_HEADER (TYPE_MAIN_DECL (type
)))
2544 /* Don't warn about visibility if the class has explicit visibility. */
2545 if (CLASSTYPE_VISIBILITY_SPECIFIED (type
))
2546 vis
= VISIBILITY_INTERNAL
;
2548 for (t
= TYPE_FIELDS (type
); t
; t
= DECL_CHAIN (t
))
2549 if (TREE_CODE (t
) == FIELD_DECL
&& TREE_TYPE (t
) != error_mark_node
)
2551 tree ftype
= strip_pointer_or_array_types (TREE_TYPE (t
));
2552 int subvis
= type_visibility (ftype
);
2554 if (subvis
== VISIBILITY_ANON
)
2556 if (!in_main_input_context())
2558 tree nlt
= no_linkage_check (ftype
, /*relaxed_p=*/false);
2561 if (same_type_p (TREE_TYPE (t
), nlt
))
2562 warning (OPT_Wsubobject_linkage
, "\
2563 %qT has a field %qD whose type has no linkage",
2566 warning (OPT_Wsubobject_linkage
, "\
2567 %qT has a field %qD whose type depends on the type %qT which has no linkage",
2571 warning (OPT_Wsubobject_linkage
, "\
2572 %qT has a field %qD whose type uses the anonymous namespace",
2576 else if (MAYBE_CLASS_TYPE_P (ftype
)
2577 && vis
< VISIBILITY_HIDDEN
2578 && subvis
>= VISIBILITY_HIDDEN
)
2579 warning (OPT_Wattributes
, "\
2580 %qT declared with greater visibility than the type of its field %qD",
2584 binfo
= TYPE_BINFO (type
);
2585 for (i
= 0; BINFO_BASE_ITERATE (binfo
, i
, t
); ++i
)
2587 int subvis
= type_visibility (TREE_TYPE (t
));
2589 if (subvis
== VISIBILITY_ANON
)
2591 if (!in_main_input_context())
2593 tree nlt
= no_linkage_check (TREE_TYPE (t
), /*relaxed_p=*/false);
2596 if (same_type_p (TREE_TYPE (t
), nlt
))
2597 warning (OPT_Wsubobject_linkage
, "\
2598 %qT has a base %qT whose type has no linkage",
2599 type
, TREE_TYPE (t
));
2601 warning (OPT_Wsubobject_linkage
, "\
2602 %qT has a base %qT whose type depends on the type %qT which has no linkage",
2603 type
, TREE_TYPE (t
), nlt
);
2606 warning (OPT_Wsubobject_linkage
, "\
2607 %qT has a base %qT whose type uses the anonymous namespace",
2608 type
, TREE_TYPE (t
));
2611 else if (vis
< VISIBILITY_HIDDEN
2612 && subvis
>= VISIBILITY_HIDDEN
)
2613 warning (OPT_Wattributes
, "\
2614 %qT declared with greater visibility than its base %qT",
2615 type
, TREE_TYPE (t
));
2619 /* Functions for adjusting the visibility of a tagged type and its nested
2620 types and declarations when it gets a name for linkage purposes from a
2623 static void bt_reset_linkage_1 (binding_entry
, void *);
2624 static void bt_reset_linkage_2 (binding_entry
, void *);
2626 /* First reset the visibility of all the types. */
2629 reset_type_linkage_1 (tree type
)
2631 set_linkage_according_to_type (type
, TYPE_MAIN_DECL (type
));
2632 if (CLASS_TYPE_P (type
))
2633 binding_table_foreach (CLASSTYPE_NESTED_UTDS (type
),
2634 bt_reset_linkage_1
, NULL
);
2637 bt_reset_linkage_1 (binding_entry b
, void */
*data*/
)
2639 reset_type_linkage_1 (b
->type
);
2642 /* Then reset the visibility of any static data members or member
2643 functions that use those types. */
2646 reset_decl_linkage (tree decl
)
2648 if (TREE_PUBLIC (decl
))
2650 if (DECL_CLONED_FUNCTION_P (decl
))
2652 TREE_PUBLIC (decl
) = true;
2653 DECL_INTERFACE_KNOWN (decl
) = false;
2654 determine_visibility (decl
);
2655 tentative_decl_linkage (decl
);
2658 reset_type_linkage_2 (tree type
)
2660 if (CLASS_TYPE_P (type
))
2662 if (tree vt
= CLASSTYPE_VTABLES (type
))
2664 tree name
= mangle_vtbl_for_type (type
);
2665 DECL_NAME (vt
) = name
;
2666 SET_DECL_ASSEMBLER_NAME (vt
, name
);
2667 reset_decl_linkage (vt
);
2669 if (tree ti
= CLASSTYPE_TYPEINFO_VAR (type
))
2671 tree name
= mangle_typeinfo_for_type (type
);
2672 DECL_NAME (ti
) = name
;
2673 SET_DECL_ASSEMBLER_NAME (ti
, name
);
2674 TREE_TYPE (name
) = type
;
2675 reset_decl_linkage (ti
);
2677 for (tree m
= TYPE_FIELDS (type
); m
; m
= DECL_CHAIN (m
))
2679 reset_decl_linkage (m
);
2680 for (tree m
= TYPE_METHODS (type
); m
; m
= DECL_CHAIN (m
))
2682 reset_decl_linkage (m
);
2683 if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (m
))
2684 /* Also update its name, for cxx_dwarf_name. */
2685 DECL_NAME (m
) = TYPE_IDENTIFIER (type
);
2687 binding_table_foreach (CLASSTYPE_NESTED_UTDS (type
),
2688 bt_reset_linkage_2
, NULL
);
2692 bt_reset_linkage_2 (binding_entry b
, void */
*data*/
)
2694 reset_type_linkage_2 (b
->type
);
2697 reset_type_linkage (tree type
)
2699 reset_type_linkage_1 (type
);
2700 reset_type_linkage_2 (type
);
2703 /* Set up our initial idea of what the linkage of DECL should be. */
2706 tentative_decl_linkage (tree decl
)
2708 if (DECL_INTERFACE_KNOWN (decl
))
2709 /* We've already made a decision as to how this function will
2711 else if (vague_linkage_p (decl
))
2713 if (TREE_CODE (decl
) == FUNCTION_DECL
2714 && decl_defined_p (decl
))
2716 DECL_EXTERNAL (decl
) = 1;
2717 DECL_NOT_REALLY_EXTERN (decl
) = 1;
2718 note_vague_linkage_fn (decl
);
2719 /* A non-template inline function with external linkage will
2720 always be COMDAT. As we must eventually determine the
2721 linkage of all functions, and as that causes writes to
2722 the data mapped in from the PCH file, it's advantageous
2723 to mark the functions at this point. */
2724 if (DECL_DECLARED_INLINE_P (decl
)
2725 && (!DECL_IMPLICIT_INSTANTIATION (decl
)
2726 || DECL_DEFAULTED_FN (decl
)))
2728 /* This function must have external linkage, as
2729 otherwise DECL_INTERFACE_KNOWN would have been
2731 gcc_assert (TREE_PUBLIC (decl
));
2732 comdat_linkage (decl
);
2733 DECL_INTERFACE_KNOWN (decl
) = 1;
2736 else if (VAR_P (decl
))
2737 maybe_commonize_var (decl
);
2741 /* DECL is a FUNCTION_DECL or VAR_DECL. If the object file linkage
2742 for DECL has not already been determined, do so now by setting
2743 DECL_EXTERNAL, DECL_COMDAT and other related flags. Until this
2744 function is called entities with vague linkage whose definitions
2745 are available must have TREE_PUBLIC set.
2747 If this function decides to place DECL in COMDAT, it will set
2748 appropriate flags -- but will not clear DECL_EXTERNAL. It is up to
2749 the caller to decide whether or not to clear DECL_EXTERNAL. Some
2750 callers defer that decision until it is clear that DECL is actually
2754 import_export_decl (tree decl
)
2759 tree class_type
= NULL_TREE
;
2761 if (DECL_INTERFACE_KNOWN (decl
))
2764 /* We cannot determine what linkage to give to an entity with vague
2765 linkage until the end of the file. For example, a virtual table
2766 for a class will be defined if and only if the key method is
2767 defined in this translation unit. As a further example, consider
2768 that when compiling a translation unit that uses PCH file with
2769 "-frepo" it would be incorrect to make decisions about what
2770 entities to emit when building the PCH; those decisions must be
2771 delayed until the repository information has been processed. */
2772 gcc_assert (at_eof
);
2773 /* Object file linkage for explicit instantiations is handled in
2774 mark_decl_instantiated. For static variables in functions with
2775 vague linkage, maybe_commonize_var is used.
2777 Therefore, the only declarations that should be provided to this
2778 function are those with external linkage that are:
2780 * implicit instantiations of function templates
2784 * implicit instantiations of static data members of class
2791 Furthermore, all entities that reach this point must have a
2792 definition available in this translation unit.
2794 The following assertions check these conditions. */
2795 gcc_assert (VAR_OR_FUNCTION_DECL_P (decl
));
2796 /* Any code that creates entities with TREE_PUBLIC cleared should
2797 also set DECL_INTERFACE_KNOWN. */
2798 gcc_assert (TREE_PUBLIC (decl
));
2799 if (TREE_CODE (decl
) == FUNCTION_DECL
)
2800 gcc_assert (DECL_IMPLICIT_INSTANTIATION (decl
)
2801 || DECL_FRIEND_PSEUDO_TEMPLATE_INSTANTIATION (decl
)
2802 || DECL_DECLARED_INLINE_P (decl
));
2804 gcc_assert (DECL_IMPLICIT_INSTANTIATION (decl
)
2805 || DECL_VTABLE_OR_VTT_P (decl
)
2806 || DECL_TINFO_P (decl
));
2807 /* Check that a definition of DECL is available in this translation
2809 gcc_assert (!DECL_REALLY_EXTERN (decl
));
2811 /* Assume that DECL will not have COMDAT linkage. */
2813 /* Assume that DECL will not be imported into this translation
2817 /* See if the repository tells us whether or not to emit DECL in
2818 this translation unit. */
2819 emit_p
= repo_emit_p (decl
);
2822 else if (emit_p
== 1)
2824 /* The repository indicates that this entity should be defined
2825 here. Make sure the back end honors that request. */
2827 /* Output the definition as an ordinary strong definition. */
2828 DECL_EXTERNAL (decl
) = 0;
2829 DECL_INTERFACE_KNOWN (decl
) = 1;
2834 /* We have already decided what to do with this DECL; there is no
2835 need to check anything further. */
2837 else if (VAR_P (decl
) && DECL_VTABLE_OR_VTT_P (decl
))
2839 class_type
= DECL_CONTEXT (decl
);
2840 import_export_class (class_type
);
2841 if (TYPE_FOR_JAVA (class_type
))
2843 else if (CLASSTYPE_INTERFACE_KNOWN (class_type
)
2844 && CLASSTYPE_INTERFACE_ONLY (class_type
))
2846 else if ((!flag_weak
|| TARGET_WEAK_NOT_IN_ARCHIVE_TOC
)
2847 && !CLASSTYPE_USE_TEMPLATE (class_type
)
2848 && CLASSTYPE_KEY_METHOD (class_type
)
2849 && !DECL_DECLARED_INLINE_P (CLASSTYPE_KEY_METHOD (class_type
)))
2850 /* The ABI requires that all virtual tables be emitted with
2851 COMDAT linkage. However, on systems where COMDAT symbols
2852 don't show up in the table of contents for a static
2853 archive, or on systems without weak symbols (where we
2854 approximate COMDAT linkage by using internal linkage), the
2855 linker will report errors about undefined symbols because
2856 it will not see the virtual table definition. Therefore,
2857 in the case that we know that the virtual table will be
2858 emitted in only one translation unit, we make the virtual
2859 table an ordinary definition with external linkage. */
2860 DECL_EXTERNAL (decl
) = 0;
2861 else if (CLASSTYPE_INTERFACE_KNOWN (class_type
))
2863 /* CLASS_TYPE is being exported from this translation unit,
2864 so DECL should be defined here. */
2865 if (!flag_weak
&& CLASSTYPE_EXPLICIT_INSTANTIATION (class_type
))
2866 /* If a class is declared in a header with the "extern
2867 template" extension, then it will not be instantiated,
2868 even in translation units that would normally require
2869 it. Often such classes are explicitly instantiated in
2870 one translation unit. Therefore, the explicit
2871 instantiation must be made visible to other translation
2873 DECL_EXTERNAL (decl
) = 0;
2876 /* The generic C++ ABI says that class data is always
2877 COMDAT, even if there is a key function. Some
2878 variants (e.g., the ARM EABI) says that class data
2879 only has COMDAT linkage if the class data might be
2880 emitted in more than one translation unit. When the
2881 key method can be inline and is inline, we still have
2882 to arrange for comdat even though
2883 class_data_always_comdat is false. */
2884 if (!CLASSTYPE_KEY_METHOD (class_type
)
2885 || DECL_DECLARED_INLINE_P (CLASSTYPE_KEY_METHOD (class_type
))
2886 || targetm
.cxx
.class_data_always_comdat ())
2888 /* The ABI requires COMDAT linkage. Normally, we
2889 only emit COMDAT things when they are needed;
2890 make sure that we realize that this entity is
2897 else if (!flag_implicit_templates
2898 && CLASSTYPE_IMPLICIT_INSTANTIATION (class_type
))
2903 else if (VAR_P (decl
) && DECL_TINFO_P (decl
))
2905 tree type
= TREE_TYPE (DECL_NAME (decl
));
2906 if (CLASS_TYPE_P (type
))
2909 import_export_class (type
);
2910 if (CLASSTYPE_INTERFACE_KNOWN (type
)
2911 && TYPE_POLYMORPHIC_P (type
)
2912 && CLASSTYPE_INTERFACE_ONLY (type
)
2913 /* If -fno-rtti was specified, then we cannot be sure
2914 that RTTI information will be emitted with the
2915 virtual table of the class, so we must emit it
2916 wherever it is used. */
2921 if (CLASSTYPE_INTERFACE_KNOWN (type
)
2922 && !CLASSTYPE_INTERFACE_ONLY (type
))
2924 comdat_p
= (targetm
.cxx
.class_data_always_comdat ()
2925 || (CLASSTYPE_KEY_METHOD (type
)
2926 && DECL_DECLARED_INLINE_P (CLASSTYPE_KEY_METHOD (type
))));
2931 DECL_EXTERNAL (decl
) = 0;
2941 else if (DECL_TEMPLOID_INSTANTIATION (decl
))
2943 /* DECL is an implicit instantiation of a function or static
2945 if ((flag_implicit_templates
2946 && !flag_use_repository
)
2947 || (flag_implicit_inline_templates
2948 && TREE_CODE (decl
) == FUNCTION_DECL
2949 && DECL_DECLARED_INLINE_P (decl
)))
2952 /* If we are not implicitly generating templates, then mark
2953 this entity as undefined in this translation unit. */
2956 else if (DECL_FUNCTION_MEMBER_P (decl
))
2958 if (!DECL_DECLARED_INLINE_P (decl
))
2960 tree ctype
= DECL_CONTEXT (decl
);
2961 import_export_class (ctype
);
2962 if (CLASSTYPE_INTERFACE_KNOWN (ctype
))
2964 DECL_NOT_REALLY_EXTERN (decl
)
2965 = ! (CLASSTYPE_INTERFACE_ONLY (ctype
)
2966 || (DECL_DECLARED_INLINE_P (decl
)
2967 && ! flag_implement_inlines
2968 && !DECL_VINDEX (decl
)));
2970 if (!DECL_NOT_REALLY_EXTERN (decl
))
2971 DECL_EXTERNAL (decl
) = 1;
2973 /* Always make artificials weak. */
2974 if (DECL_ARTIFICIAL (decl
) && flag_weak
)
2977 maybe_make_one_only (decl
);
2988 /* If we are importing DECL into this translation unit, mark is
2989 an undefined here. */
2990 DECL_EXTERNAL (decl
) = 1;
2991 DECL_NOT_REALLY_EXTERN (decl
) = 0;
2995 /* If we decided to put DECL in COMDAT, mark it accordingly at
2997 comdat_linkage (decl
);
3000 DECL_INTERFACE_KNOWN (decl
) = 1;
3003 /* Return an expression that performs the destruction of DECL, which
3004 must be a VAR_DECL whose type has a non-trivial destructor, or is
3005 an array whose (innermost) elements have a non-trivial destructor. */
3008 build_cleanup (tree decl
)
3010 tree clean
= cxx_maybe_build_cleanup (decl
, tf_warning_or_error
);
3011 gcc_assert (clean
!= NULL_TREE
);
3015 /* Returns the initialization guard variable for the variable DECL,
3016 which has static storage duration. */
3019 get_guard (tree decl
)
3024 sname
= mangle_guard_variable (decl
);
3025 guard
= IDENTIFIER_GLOBAL_VALUE (sname
);
3030 /* We use a type that is big enough to contain a mutex as well
3031 as an integer counter. */
3032 guard_type
= targetm
.cxx
.guard_type ();
3033 guard
= build_decl (DECL_SOURCE_LOCATION (decl
),
3034 VAR_DECL
, sname
, guard_type
);
3036 /* The guard should have the same linkage as what it guards. */
3037 TREE_PUBLIC (guard
) = TREE_PUBLIC (decl
);
3038 TREE_STATIC (guard
) = TREE_STATIC (decl
);
3039 DECL_COMMON (guard
) = DECL_COMMON (decl
);
3040 DECL_COMDAT (guard
) = DECL_COMDAT (decl
);
3041 CP_DECL_THREAD_LOCAL_P (guard
) = CP_DECL_THREAD_LOCAL_P (decl
);
3042 set_decl_tls_model (guard
, DECL_TLS_MODEL (decl
));
3043 if (DECL_ONE_ONLY (decl
))
3044 make_decl_one_only (guard
, cxx_comdat_group (guard
));
3045 if (TREE_PUBLIC (decl
))
3046 DECL_WEAK (guard
) = DECL_WEAK (decl
);
3047 DECL_VISIBILITY (guard
) = DECL_VISIBILITY (decl
);
3048 DECL_VISIBILITY_SPECIFIED (guard
) = DECL_VISIBILITY_SPECIFIED (decl
);
3050 DECL_ARTIFICIAL (guard
) = 1;
3051 DECL_IGNORED_P (guard
) = 1;
3052 TREE_USED (guard
) = 1;
3053 pushdecl_top_level_and_finish (guard
, NULL_TREE
);
3058 /* Return an atomic load of src with the appropriate memory model. */
3061 build_atomic_load_byte (tree src
, HOST_WIDE_INT model
)
3063 tree ptr_type
= build_pointer_type (char_type_node
);
3064 tree mem_model
= build_int_cst (integer_type_node
, model
);
3069 size
= tree_to_uhwi (TYPE_SIZE_UNIT (char_type_node
));
3071 fncode
= BUILT_IN_ATOMIC_LOAD_N
+ exact_log2 (size
) + 1;
3072 t
= builtin_decl_implicit ((enum built_in_function
) fncode
);
3074 addr
= build1 (ADDR_EXPR
, ptr_type
, src
);
3075 val
= build_call_expr (t
, 2, addr
, mem_model
);
3079 /* Return those bits of the GUARD variable that should be set when the
3080 guarded entity is actually initialized. */
3083 get_guard_bits (tree guard
)
3085 if (!targetm
.cxx
.guard_mask_bit ())
3087 /* We only set the first byte of the guard, in order to leave room
3088 for a mutex in the high-order bits. */
3089 guard
= build1 (ADDR_EXPR
,
3090 build_pointer_type (TREE_TYPE (guard
)),
3092 guard
= build1 (NOP_EXPR
,
3093 build_pointer_type (char_type_node
),
3095 guard
= build1 (INDIRECT_REF
, char_type_node
, guard
);
3101 /* Return an expression which determines whether or not the GUARD
3102 variable has already been initialized. */
3105 get_guard_cond (tree guard
, bool thread_safe
)
3110 guard
= get_guard_bits (guard
);
3112 guard
= build_atomic_load_byte (guard
, MEMMODEL_ACQUIRE
);
3114 /* Mask off all but the low bit. */
3115 if (targetm
.cxx
.guard_mask_bit ())
3117 guard_value
= integer_one_node
;
3118 if (!same_type_p (TREE_TYPE (guard_value
), TREE_TYPE (guard
)))
3119 guard_value
= convert (TREE_TYPE (guard
), guard_value
);
3120 guard
= cp_build_binary_op (input_location
,
3121 BIT_AND_EXPR
, guard
, guard_value
,
3122 tf_warning_or_error
);
3125 guard_value
= integer_zero_node
;
3126 if (!same_type_p (TREE_TYPE (guard_value
), TREE_TYPE (guard
)))
3127 guard_value
= convert (TREE_TYPE (guard
), guard_value
);
3128 return cp_build_binary_op (input_location
,
3129 EQ_EXPR
, guard
, guard_value
,
3130 tf_warning_or_error
);
3133 /* Return an expression which sets the GUARD variable, indicating that
3134 the variable being guarded has been initialized. */
3137 set_guard (tree guard
)
3141 /* Set the GUARD to one. */
3142 guard
= get_guard_bits (guard
);
3143 guard_init
= integer_one_node
;
3144 if (!same_type_p (TREE_TYPE (guard_init
), TREE_TYPE (guard
)))
3145 guard_init
= convert (TREE_TYPE (guard
), guard_init
);
3146 return cp_build_modify_expr (guard
, NOP_EXPR
, guard_init
,
3147 tf_warning_or_error
);
3150 /* Returns true iff we can tell that VAR does not have a dynamic
3154 var_defined_without_dynamic_init (tree var
)
3156 /* If it's defined in another TU, we can't tell. */
3157 if (DECL_EXTERNAL (var
))
3159 /* If it has a non-trivial destructor, registering the destructor
3160 counts as dynamic initialization. */
3161 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (TREE_TYPE (var
)))
3163 /* If it's in this TU, its initializer has been processed, unless
3164 it's a case of self-initialization, then DECL_INITIALIZED_P is
3165 false while the initializer is handled by finish_id_expression. */
3166 if (!DECL_INITIALIZED_P (var
))
3168 /* If it has no initializer or a constant one, it's not dynamic. */
3169 return (!DECL_NONTRIVIALLY_INITIALIZED_P (var
)
3170 || DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (var
));
3173 /* Returns true iff VAR is a variable that needs uses to be
3174 wrapped for possible dynamic initialization. */
3177 var_needs_tls_wrapper (tree var
)
3179 return (!error_operand_p (var
)
3180 && CP_DECL_THREAD_LOCAL_P (var
)
3181 && !DECL_GNU_TLS_P (var
)
3182 && !DECL_FUNCTION_SCOPE_P (var
)
3183 && !var_defined_without_dynamic_init (var
));
3186 /* Get the FUNCTION_DECL for the shared TLS init function for this
3187 translation unit. */
3190 get_local_tls_init_fn (void)
3192 tree sname
= get_identifier ("__tls_init");
3193 tree fn
= IDENTIFIER_GLOBAL_VALUE (sname
);
3196 fn
= build_lang_decl (FUNCTION_DECL
, sname
,
3197 build_function_type (void_type_node
,
3199 SET_DECL_LANGUAGE (fn
, lang_c
);
3200 TREE_PUBLIC (fn
) = false;
3201 DECL_ARTIFICIAL (fn
) = true;
3203 SET_IDENTIFIER_GLOBAL_VALUE (sname
, fn
);
3208 /* Get a FUNCTION_DECL for the init function for the thread_local
3209 variable VAR. The init function will be an alias to the function
3210 that initializes all the non-local TLS variables in the translation
3211 unit. The init function is only used by the wrapper function. */
3214 get_tls_init_fn (tree var
)
3216 /* Only C++11 TLS vars need this init fn. */
3217 if (!var_needs_tls_wrapper (var
))
3220 /* If -fno-extern-tls-init, assume that we don't need to call
3221 a tls init function for a variable defined in another TU. */
3222 if (!flag_extern_tls_init
&& DECL_EXTERNAL (var
))
3225 #ifdef ASM_OUTPUT_DEF
3226 /* If the variable is internal, or if we can't generate aliases,
3227 call the local init function directly. */
3228 if (!TREE_PUBLIC (var
))
3230 return get_local_tls_init_fn ();
3232 tree sname
= mangle_tls_init_fn (var
);
3233 tree fn
= IDENTIFIER_GLOBAL_VALUE (sname
);
3236 fn
= build_lang_decl (FUNCTION_DECL
, sname
,
3237 build_function_type (void_type_node
,
3239 SET_DECL_LANGUAGE (fn
, lang_c
);
3240 TREE_PUBLIC (fn
) = TREE_PUBLIC (var
);
3241 DECL_ARTIFICIAL (fn
) = true;
3242 DECL_COMDAT (fn
) = DECL_COMDAT (var
);
3243 DECL_EXTERNAL (fn
) = DECL_EXTERNAL (var
);
3244 if (DECL_ONE_ONLY (var
))
3245 make_decl_one_only (fn
, cxx_comdat_group (fn
));
3246 if (TREE_PUBLIC (var
))
3248 tree obtype
= strip_array_types (non_reference (TREE_TYPE (var
)));
3249 /* If the variable is defined somewhere else and might have static
3250 initialization, make the init function a weak reference. */
3251 if ((!TYPE_NEEDS_CONSTRUCTING (obtype
)
3252 || TYPE_HAS_CONSTEXPR_CTOR (obtype
))
3253 && TYPE_HAS_TRIVIAL_DESTRUCTOR (obtype
)
3254 && DECL_EXTERNAL (var
))
3257 DECL_WEAK (fn
) = DECL_WEAK (var
);
3259 DECL_VISIBILITY (fn
) = DECL_VISIBILITY (var
);
3260 DECL_VISIBILITY_SPECIFIED (fn
) = DECL_VISIBILITY_SPECIFIED (var
);
3261 DECL_DLLIMPORT_P (fn
) = DECL_DLLIMPORT_P (var
);
3262 DECL_IGNORED_P (fn
) = 1;
3265 DECL_BEFRIENDING_CLASSES (fn
) = var
;
3267 SET_IDENTIFIER_GLOBAL_VALUE (sname
, fn
);
3272 /* Get a FUNCTION_DECL for the init wrapper function for the thread_local
3273 variable VAR. The wrapper function calls the init function (if any) for
3274 VAR and then returns a reference to VAR. The wrapper function is used
3275 in place of VAR everywhere VAR is mentioned. */
3278 get_tls_wrapper_fn (tree var
)
3280 /* Only C++11 TLS vars need this wrapper fn. */
3281 if (!var_needs_tls_wrapper (var
))
3284 tree sname
= mangle_tls_wrapper_fn (var
);
3285 tree fn
= IDENTIFIER_GLOBAL_VALUE (sname
);
3288 /* A named rvalue reference is an lvalue, so the wrapper should
3289 always return an lvalue reference. */
3290 tree type
= non_reference (TREE_TYPE (var
));
3291 type
= build_reference_type (type
);
3292 tree fntype
= build_function_type (type
, void_list_node
);
3293 fn
= build_lang_decl (FUNCTION_DECL
, sname
, fntype
);
3294 SET_DECL_LANGUAGE (fn
, lang_c
);
3295 TREE_PUBLIC (fn
) = TREE_PUBLIC (var
);
3296 DECL_ARTIFICIAL (fn
) = true;
3297 DECL_IGNORED_P (fn
) = 1;
3298 /* The wrapper is inline and emitted everywhere var is used. */
3299 DECL_DECLARED_INLINE_P (fn
) = true;
3300 if (TREE_PUBLIC (var
))
3302 comdat_linkage (fn
);
3303 #ifdef HAVE_GAS_HIDDEN
3304 /* Make the wrapper bind locally; there's no reason to share
3305 the wrapper between multiple shared objects. */
3306 DECL_VISIBILITY (fn
) = VISIBILITY_INTERNAL
;
3307 DECL_VISIBILITY_SPECIFIED (fn
) = true;
3310 if (!TREE_PUBLIC (fn
))
3311 DECL_INTERFACE_KNOWN (fn
) = true;
3313 note_vague_linkage_fn (fn
);
3316 /* We want CSE to commonize calls to the wrapper, but marking it as
3317 pure is unsafe since it has side-effects. I guess we need a new
3318 ECF flag even weaker than ECF_PURE. FIXME! */
3319 DECL_PURE_P (fn
) = true;
3322 DECL_BEFRIENDING_CLASSES (fn
) = var
;
3324 SET_IDENTIFIER_GLOBAL_VALUE (sname
, fn
);
3329 /* At EOF, generate the definition for the TLS wrapper function FN:
3332 if (init_fn) init_fn();
3337 generate_tls_wrapper (tree fn
)
3339 tree var
= DECL_BEFRIENDING_CLASSES (fn
);
3341 start_preparsed_function (fn
, NULL_TREE
, SF_DEFAULT
| SF_PRE_PARSED
);
3342 tree body
= begin_function_body ();
3343 /* Only call the init fn if there might be one. */
3344 if (tree init_fn
= get_tls_init_fn (var
))
3346 tree if_stmt
= NULL_TREE
;
3347 /* If init_fn is a weakref, make sure it exists before calling. */
3348 if (lookup_attribute ("weak", DECL_ATTRIBUTES (init_fn
)))
3350 if_stmt
= begin_if_stmt ();
3351 tree addr
= cp_build_addr_expr (init_fn
, tf_warning_or_error
);
3352 tree cond
= cp_build_binary_op (DECL_SOURCE_LOCATION (var
),
3353 NE_EXPR
, addr
, nullptr_node
,
3354 tf_warning_or_error
);
3355 finish_if_stmt_cond (cond
, if_stmt
);
3357 finish_expr_stmt (build_cxx_call
3358 (init_fn
, 0, NULL
, tf_warning_or_error
));
3361 finish_then_clause (if_stmt
);
3362 finish_if_stmt (if_stmt
);
3366 /* If there's no initialization, the wrapper is a constant function. */
3367 TREE_READONLY (fn
) = true;
3368 finish_return_stmt (convert_from_reference (var
));
3369 finish_function_body (body
);
3370 expand_or_defer_fn (finish_function (0));
3373 /* Start the process of running a particular set of global constructors
3374 or destructors. Subroutine of do_[cd]tors. Also called from
3375 vtv_start_verification_constructor_init_function. */
3378 start_objects (int method_type
, int initp
)
3384 /* Make ctor or dtor function. METHOD_TYPE may be 'I' or 'D'. */
3386 if (initp
!= DEFAULT_INIT_PRIORITY
)
3396 sprintf (type
, "sub_%c%c%.5u", method_type
, joiner
, initp
);
3399 sprintf (type
, "sub_%c", method_type
);
3401 fndecl
= build_lang_decl (FUNCTION_DECL
,
3402 get_file_function_name (type
),
3403 build_function_type_list (void_type_node
,
3405 start_preparsed_function (fndecl
, /*attrs=*/NULL_TREE
, SF_PRE_PARSED
);
3407 TREE_PUBLIC (current_function_decl
) = 0;
3409 /* Mark as artificial because it's not explicitly in the user's
3411 DECL_ARTIFICIAL (current_function_decl
) = 1;
3413 /* Mark this declaration as used to avoid spurious warnings. */
3414 TREE_USED (current_function_decl
) = 1;
3416 /* Mark this function as a global constructor or destructor. */
3417 if (method_type
== 'I')
3418 DECL_GLOBAL_CTOR_P (current_function_decl
) = 1;
3420 DECL_GLOBAL_DTOR_P (current_function_decl
) = 1;
3422 body
= begin_compound_stmt (BCS_FN_BODY
);
3427 /* Finish the process of running a particular set of global constructors
3428 or destructors. Subroutine of do_[cd]tors. */
3431 finish_objects (int method_type
, int initp
, tree body
)
3436 finish_compound_stmt (body
);
3437 fn
= finish_function (0);
3439 if (method_type
== 'I')
3441 DECL_STATIC_CONSTRUCTOR (fn
) = 1;
3442 decl_init_priority_insert (fn
, initp
);
3446 DECL_STATIC_DESTRUCTOR (fn
) = 1;
3447 decl_fini_priority_insert (fn
, initp
);
3450 expand_or_defer_fn (fn
);
3453 /* The names of the parameters to the function created to handle
3454 initializations and destructions for objects with static storage
3456 #define INITIALIZE_P_IDENTIFIER "__initialize_p"
3457 #define PRIORITY_IDENTIFIER "__priority"
3459 /* The name of the function we create to handle initializations and
3460 destructions for objects with static storage duration. */
3461 #define SSDF_IDENTIFIER "__static_initialization_and_destruction"
3463 /* The declaration for the __INITIALIZE_P argument. */
3464 static GTY(()) tree initialize_p_decl
;
3466 /* The declaration for the __PRIORITY argument. */
3467 static GTY(()) tree priority_decl
;
3469 /* The declaration for the static storage duration function. */
3470 static GTY(()) tree ssdf_decl
;
3472 /* All the static storage duration functions created in this
3473 translation unit. */
3474 static GTY(()) vec
<tree
, va_gc
> *ssdf_decls
;
3476 /* A map from priority levels to information about that priority
3477 level. There may be many such levels, so efficient lookup is
3479 static splay_tree priority_info_map
;
3481 /* Begins the generation of the function that will handle all
3482 initialization and destruction of objects with static storage
3483 duration. The function generated takes two parameters of type
3484 `int': __INITIALIZE_P and __PRIORITY. If __INITIALIZE_P is
3485 nonzero, it performs initializations. Otherwise, it performs
3486 destructions. It only performs those initializations or
3487 destructions with the indicated __PRIORITY. The generated function
3490 It is assumed that this function will only be called once per
3491 translation unit. */
3494 start_static_storage_duration_function (unsigned count
)
3498 char id
[sizeof (SSDF_IDENTIFIER
) + 1 /* '\0' */ + 32];
3500 /* Create the identifier for this function. It will be of the form
3501 SSDF_IDENTIFIER_<number>. */
3502 sprintf (id
, "%s_%u", SSDF_IDENTIFIER
, count
);
3504 type
= build_function_type_list (void_type_node
,
3505 integer_type_node
, integer_type_node
,
3508 /* Create the FUNCTION_DECL itself. */
3509 ssdf_decl
= build_lang_decl (FUNCTION_DECL
,
3510 get_identifier (id
),
3512 TREE_PUBLIC (ssdf_decl
) = 0;
3513 DECL_ARTIFICIAL (ssdf_decl
) = 1;
3515 /* Put this function in the list of functions to be called from the
3516 static constructors and destructors. */
3519 vec_alloc (ssdf_decls
, 32);
3521 /* Take this opportunity to initialize the map from priority
3522 numbers to information about that priority level. */
3523 priority_info_map
= splay_tree_new (splay_tree_compare_ints
,
3524 /*delete_key_fn=*/0,
3525 /*delete_value_fn=*/
3526 (splay_tree_delete_value_fn
) &free
);
3528 /* We always need to generate functions for the
3529 DEFAULT_INIT_PRIORITY so enter it now. That way when we walk
3530 priorities later, we'll be sure to find the
3531 DEFAULT_INIT_PRIORITY. */
3532 get_priority_info (DEFAULT_INIT_PRIORITY
);
3535 vec_safe_push (ssdf_decls
, ssdf_decl
);
3537 /* Create the argument list. */
3538 initialize_p_decl
= cp_build_parm_decl
3539 (get_identifier (INITIALIZE_P_IDENTIFIER
), integer_type_node
);
3540 DECL_CONTEXT (initialize_p_decl
) = ssdf_decl
;
3541 TREE_USED (initialize_p_decl
) = 1;
3542 priority_decl
= cp_build_parm_decl
3543 (get_identifier (PRIORITY_IDENTIFIER
), integer_type_node
);
3544 DECL_CONTEXT (priority_decl
) = ssdf_decl
;
3545 TREE_USED (priority_decl
) = 1;
3547 DECL_CHAIN (initialize_p_decl
) = priority_decl
;
3548 DECL_ARGUMENTS (ssdf_decl
) = initialize_p_decl
;
3550 /* Put the function in the global scope. */
3551 pushdecl (ssdf_decl
);
3553 /* Start the function itself. This is equivalent to declaring the
3556 static void __ssdf (int __initialize_p, init __priority_p);
3558 It is static because we only need to call this function from the
3559 various constructor and destructor functions for this module. */
3560 start_preparsed_function (ssdf_decl
,
3561 /*attrs=*/NULL_TREE
,
3564 /* Set up the scope of the outermost block in the function. */
3565 body
= begin_compound_stmt (BCS_FN_BODY
);
3570 /* Finish the generation of the function which performs initialization
3571 and destruction of objects with static storage duration. After
3572 this point, no more such objects can be created. */
3575 finish_static_storage_duration_function (tree body
)
3577 /* Close out the function. */
3578 finish_compound_stmt (body
);
3579 expand_or_defer_fn (finish_function (0));
3582 /* Return the information about the indicated PRIORITY level. If no
3583 code to handle this level has yet been generated, generate the
3584 appropriate prologue. */
3586 static priority_info
3587 get_priority_info (int priority
)
3592 n
= splay_tree_lookup (priority_info_map
,
3593 (splay_tree_key
) priority
);
3596 /* Create a new priority information structure, and insert it
3598 pi
= XNEW (struct priority_info_s
);
3599 pi
->initializations_p
= 0;
3600 pi
->destructions_p
= 0;
3601 splay_tree_insert (priority_info_map
,
3602 (splay_tree_key
) priority
,
3603 (splay_tree_value
) pi
);
3606 pi
= (priority_info
) n
->value
;
3611 /* The effective initialization priority of a DECL. */
3613 #define DECL_EFFECTIVE_INIT_PRIORITY(decl) \
3614 ((!DECL_HAS_INIT_PRIORITY_P (decl) || DECL_INIT_PRIORITY (decl) == 0) \
3615 ? DEFAULT_INIT_PRIORITY : DECL_INIT_PRIORITY (decl))
3617 /* Whether a DECL needs a guard to protect it against multiple
3620 #define NEEDS_GUARD_P(decl) (TREE_PUBLIC (decl) && (DECL_COMMON (decl) \
3621 || DECL_ONE_ONLY (decl) \
3622 || DECL_WEAK (decl)))
3624 /* Called from one_static_initialization_or_destruction(),
3626 Walks the initializer list of a global variable and looks for
3627 temporary variables (DECL_NAME() == NULL and DECL_ARTIFICIAL != 0)
3628 and that have their DECL_CONTEXT() == NULL.
3629 For each such temporary variable, set their DECL_CONTEXT() to
3630 the current function. This is necessary because otherwise
3631 some optimizers (enabled by -O2 -fprofile-arcs) might crash
3632 when trying to refer to a temporary variable that does not have
3633 it's DECL_CONTECT() properly set. */
3635 fix_temporary_vars_context_r (tree
*node
,
3639 gcc_assert (current_function_decl
);
3641 if (TREE_CODE (*node
) == BIND_EXPR
)
3645 for (var
= BIND_EXPR_VARS (*node
); var
; var
= DECL_CHAIN (var
))
3648 && DECL_ARTIFICIAL (var
)
3649 && !DECL_CONTEXT (var
))
3650 DECL_CONTEXT (var
) = current_function_decl
;
3656 /* Set up to handle the initialization or destruction of DECL. If
3657 INITP is nonzero, we are initializing the variable. Otherwise, we
3658 are destroying it. */
3661 one_static_initialization_or_destruction (tree decl
, tree init
, bool initp
)
3663 tree guard_if_stmt
= NULL_TREE
;
3666 /* If we are supposed to destruct and there's a trivial destructor,
3667 nothing has to be done. */
3669 && TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl
)))
3672 /* Trick the compiler into thinking we are at the file and line
3673 where DECL was declared so that error-messages make sense, and so
3674 that the debugger will show somewhat sensible file and line
3676 input_location
= DECL_SOURCE_LOCATION (decl
);
3678 /* Make sure temporary variables in the initialiser all have
3679 their DECL_CONTEXT() set to a value different from NULL_TREE.
3680 This can happen when global variables initialisers are built.
3681 In that case, the DECL_CONTEXT() of the global variables _AND_ of all
3682 the temporary variables that might have been generated in the
3683 accompagning initialisers is NULL_TREE, meaning the variables have been
3684 declared in the global namespace.
3685 What we want to do here is to fix that and make sure the DECL_CONTEXT()
3686 of the temporaries are set to the current function decl. */
3687 cp_walk_tree_without_duplicates (&init
,
3688 fix_temporary_vars_context_r
,
3695 Access control for implicit calls to the constructors,
3696 the conversion functions, or the destructor called to
3697 create and destroy a static data member is performed as
3698 if these calls appeared in the scope of the member's
3701 we pretend we are in a static member function of the class of
3702 which the DECL is a member. */
3703 if (member_p (decl
))
3705 DECL_CONTEXT (current_function_decl
) = DECL_CONTEXT (decl
);
3706 DECL_STATIC_FUNCTION_P (current_function_decl
) = 1;
3709 /* Assume we don't need a guard. */
3711 /* We need a guard if this is an object with external linkage that
3712 might be initialized in more than one place. (For example, a
3713 static data member of a template, when the data member requires
3715 if (NEEDS_GUARD_P (decl
))
3719 guard
= get_guard (decl
);
3721 /* When using __cxa_atexit, we just check the GUARD as we would
3722 for a local static. */
3723 if (flag_use_cxa_atexit
)
3725 /* When using __cxa_atexit, we never try to destroy
3726 anything from a static destructor. */
3728 guard_cond
= get_guard_cond (guard
, false);
3730 /* If we don't have __cxa_atexit, then we will be running
3731 destructors from .fini sections, or their equivalents. So,
3732 we need to know how many times we've tried to initialize this
3733 object. We do initializations only if the GUARD is zero,
3734 i.e., if we are the first to initialize the variable. We do
3735 destructions only if the GUARD is one, i.e., if we are the
3736 last to destroy the variable. */
3739 = cp_build_binary_op (input_location
,
3741 cp_build_unary_op (PREINCREMENT_EXPR
,
3744 tf_warning_or_error
),
3746 tf_warning_or_error
);
3749 = cp_build_binary_op (input_location
,
3751 cp_build_unary_op (PREDECREMENT_EXPR
,
3754 tf_warning_or_error
),
3756 tf_warning_or_error
);
3758 guard_if_stmt
= begin_if_stmt ();
3759 finish_if_stmt_cond (guard_cond
, guard_if_stmt
);
3763 /* If we're using __cxa_atexit, we have not already set the GUARD,
3764 so we must do so now. */
3765 if (guard
&& initp
&& flag_use_cxa_atexit
)
3766 finish_expr_stmt (set_guard (guard
));
3768 /* Perform the initialization or destruction. */
3773 finish_expr_stmt (init
);
3774 if (flag_sanitize
& SANITIZE_ADDRESS
)
3776 varpool_node
*vnode
= varpool_node::get (decl
);
3778 vnode
->dynamically_initialized
= 1;
3782 /* If we're using __cxa_atexit, register a function that calls the
3783 destructor for the object. */
3784 if (flag_use_cxa_atexit
)
3785 finish_expr_stmt (register_dtor_fn (decl
));
3788 finish_expr_stmt (build_cleanup (decl
));
3790 /* Finish the guard if-stmt, if necessary. */
3793 finish_then_clause (guard_if_stmt
);
3794 finish_if_stmt (guard_if_stmt
);
3797 /* Now that we're done with DECL we don't need to pretend to be a
3798 member of its class any longer. */
3799 DECL_CONTEXT (current_function_decl
) = NULL_TREE
;
3800 DECL_STATIC_FUNCTION_P (current_function_decl
) = 0;
3803 /* Generate code to do the initialization or destruction of the decls in VARS,
3804 a TREE_LIST of VAR_DECL with static storage duration.
3805 Whether initialization or destruction is performed is specified by INITP. */
3808 do_static_initialization_or_destruction (tree vars
, bool initp
)
3810 tree node
, init_if_stmt
, cond
;
3812 /* Build the outer if-stmt to check for initialization or destruction. */
3813 init_if_stmt
= begin_if_stmt ();
3814 cond
= initp
? integer_one_node
: integer_zero_node
;
3815 cond
= cp_build_binary_op (input_location
,
3819 tf_warning_or_error
);
3820 finish_if_stmt_cond (cond
, init_if_stmt
);
3822 /* To make sure dynamic construction doesn't access globals from other
3823 compilation units where they might not be yet constructed, for
3824 -fsanitize=address insert __asan_before_dynamic_init call that
3825 prevents access to either all global variables that need construction
3826 in other compilation units, or at least those that haven't been
3827 initialized yet. Variables that need dynamic construction in
3828 the current compilation unit are kept accessible. */
3829 if (flag_sanitize
& SANITIZE_ADDRESS
)
3830 finish_expr_stmt (asan_dynamic_init_call (/*after_p=*/false));
3834 tree decl
= TREE_VALUE (node
);
3835 tree priority_if_stmt
;
3839 /* If we don't need a destructor, there's nothing to do. Avoid
3840 creating a possibly empty if-stmt. */
3841 if (!initp
&& TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl
)))
3843 node
= TREE_CHAIN (node
);
3847 /* Remember that we had an initialization or finalization at this
3849 priority
= DECL_EFFECTIVE_INIT_PRIORITY (decl
);
3850 pi
= get_priority_info (priority
);
3852 pi
->initializations_p
= 1;
3854 pi
->destructions_p
= 1;
3856 /* Conditionalize this initialization on being in the right priority
3857 and being initializing/finalizing appropriately. */
3858 priority_if_stmt
= begin_if_stmt ();
3859 cond
= cp_build_binary_op (input_location
,
3862 build_int_cst (NULL_TREE
, priority
),
3863 tf_warning_or_error
);
3864 finish_if_stmt_cond (cond
, priority_if_stmt
);
3866 /* Process initializers with same priority. */
3868 && DECL_EFFECTIVE_INIT_PRIORITY (TREE_VALUE (node
)) == priority
;
3869 node
= TREE_CHAIN (node
))
3870 /* Do one initialization or destruction. */
3871 one_static_initialization_or_destruction (TREE_VALUE (node
),
3872 TREE_PURPOSE (node
), initp
);
3874 /* Finish up the priority if-stmt body. */
3875 finish_then_clause (priority_if_stmt
);
3876 finish_if_stmt (priority_if_stmt
);
3880 /* Revert what __asan_before_dynamic_init did by calling
3881 __asan_after_dynamic_init. */
3882 if (flag_sanitize
& SANITIZE_ADDRESS
)
3883 finish_expr_stmt (asan_dynamic_init_call (/*after_p=*/true));
3885 /* Finish up the init/destruct if-stmt body. */
3886 finish_then_clause (init_if_stmt
);
3887 finish_if_stmt (init_if_stmt
);
3890 /* VARS is a list of variables with static storage duration which may
3891 need initialization and/or finalization. Remove those variables
3892 that don't really need to be initialized or finalized, and return
3893 the resulting list. The order in which the variables appear in
3894 VARS is in reverse order of the order in which they should actually
3895 be initialized. The list we return is in the unreversed order;
3896 i.e., the first variable should be initialized first. */
3899 prune_vars_needing_no_initialization (tree
*vars
)
3902 tree result
= NULL_TREE
;
3907 tree decl
= TREE_VALUE (t
);
3908 tree init
= TREE_PURPOSE (t
);
3910 /* Deal gracefully with error. */
3911 if (decl
== error_mark_node
)
3913 var
= &TREE_CHAIN (t
);
3917 /* The only things that can be initialized are variables. */
3918 gcc_assert (VAR_P (decl
));
3920 /* If this object is not defined, we don't need to do anything
3922 if (DECL_EXTERNAL (decl
))
3924 var
= &TREE_CHAIN (t
);
3928 /* Also, if the initializer already contains errors, we can bail
3930 if (init
&& TREE_CODE (init
) == TREE_LIST
3931 && value_member (error_mark_node
, init
))
3933 var
= &TREE_CHAIN (t
);
3937 /* This variable is going to need initialization and/or
3938 finalization, so we add it to the list. */
3939 *var
= TREE_CHAIN (t
);
3940 TREE_CHAIN (t
) = result
;
3947 /* Make sure we have told the back end about all the variables in
3951 write_out_vars (tree vars
)
3955 for (v
= vars
; v
; v
= TREE_CHAIN (v
))
3957 tree var
= TREE_VALUE (v
);
3958 if (!var_finalized_p (var
))
3960 import_export_decl (var
);
3961 rest_of_decl_compilation (var
, 1, 1);
3966 /* Generate a static constructor (if CONSTRUCTOR_P) or destructor
3967 (otherwise) that will initialize all global objects with static
3968 storage duration having the indicated PRIORITY. */
3971 generate_ctor_or_dtor_function (bool constructor_p
, int priority
,
3979 input_location
= *locus
;
3981 /* Was: locus->line++; */
3983 /* We use `I' to indicate initialization and `D' to indicate
3985 function_key
= constructor_p
? 'I' : 'D';
3987 /* We emit the function lazily, to avoid generating empty
3988 global constructors and destructors. */
3991 /* For Objective-C++, we may need to initialize metadata found in this module.
3992 This must be done _before_ any other static initializations. */
3993 if (c_dialect_objc () && (priority
== DEFAULT_INIT_PRIORITY
)
3994 && constructor_p
&& objc_static_init_needed_p ())
3996 body
= start_objects (function_key
, priority
);
3997 objc_generate_static_init_call (NULL_TREE
);
4000 /* Call the static storage duration function with appropriate
4002 FOR_EACH_VEC_SAFE_ELT (ssdf_decls
, i
, fndecl
)
4004 /* Calls to pure or const functions will expand to nothing. */
4005 if (! (flags_from_decl_or_type (fndecl
) & (ECF_CONST
| ECF_PURE
)))
4010 body
= start_objects (function_key
, priority
);
4012 call
= cp_build_function_call_nary (fndecl
, tf_warning_or_error
,
4013 build_int_cst (NULL_TREE
,
4015 build_int_cst (NULL_TREE
,
4018 finish_expr_stmt (call
);
4022 /* Close out the function. */
4024 finish_objects (function_key
, priority
, body
);
4027 /* Generate constructor and destructor functions for the priority
4031 generate_ctor_and_dtor_functions_for_priority (splay_tree_node n
, void * data
)
4033 location_t
*locus
= (location_t
*) data
;
4034 int priority
= (int) n
->key
;
4035 priority_info pi
= (priority_info
) n
->value
;
4037 /* Generate the functions themselves, but only if they are really
4039 if (pi
->initializations_p
)
4040 generate_ctor_or_dtor_function (/*constructor_p=*/true, priority
, locus
);
4041 if (pi
->destructions_p
)
4042 generate_ctor_or_dtor_function (/*constructor_p=*/false, priority
, locus
);
4044 /* Keep iterating. */
4048 /* Java requires that we be able to reference a local address for a
4049 method, and not be confused by PLT entries. If supported, create a
4050 hidden alias for all such methods. */
4053 build_java_method_aliases (void)
4055 #ifndef HAVE_GAS_HIDDEN
4059 struct cgraph_node
*node
;
4060 FOR_EACH_FUNCTION (node
)
4062 tree fndecl
= node
->decl
;
4064 if (DECL_CLASS_SCOPE_P (fndecl
)
4065 && TYPE_FOR_JAVA (DECL_CONTEXT (fndecl
))
4066 && TARGET_USE_LOCAL_THUNK_ALIAS_P (fndecl
))
4068 /* Mangle the name in a predictable way; we need to reference
4069 this from a java compiled object file. */
4070 tree oid
= DECL_ASSEMBLER_NAME (fndecl
);
4071 const char *oname
= IDENTIFIER_POINTER (oid
);
4072 gcc_assert (oname
[0] == '_' && oname
[1] == 'Z');
4073 char *nname
= ACONCAT (("_ZGA", oname
+ 2, NULL
));
4075 tree alias
= make_alias_for (fndecl
, get_identifier (nname
));
4076 TREE_PUBLIC (alias
) = 1;
4077 DECL_VISIBILITY (alias
) = VISIBILITY_HIDDEN
;
4079 cgraph_node::create_same_body_alias (alias
, fndecl
);
4084 /* Return C++ property of T, based on given operation OP. */
4087 cpp_check (tree t
, cpp_operation op
)
4091 case HAS_DEPENDENT_TEMPLATE_ARGS
:
4093 tree ti
= CLASSTYPE_TEMPLATE_INFO (t
);
4096 ++processing_template_decl
;
4097 const bool dep
= any_dependent_template_arguments_p (TI_ARGS (ti
));
4098 --processing_template_decl
;
4102 return DECL_PURE_VIRTUAL_P (t
);
4103 case IS_CONSTRUCTOR
:
4104 return DECL_CONSTRUCTOR_P (t
);
4106 return DECL_DESTRUCTOR_P (t
);
4107 case IS_COPY_CONSTRUCTOR
:
4108 return DECL_COPY_CONSTRUCTOR_P (t
);
4109 case IS_MOVE_CONSTRUCTOR
:
4110 return DECL_MOVE_CONSTRUCTOR_P (t
);
4112 return TREE_CODE (t
) == TEMPLATE_DECL
;
4114 return trivial_type_p (t
);
4120 /* Collect source file references recursively, starting from NAMESPC. */
4123 collect_source_refs (tree namespc
)
4130 /* Iterate over names in this name space. */
4131 for (t
= NAMESPACE_LEVEL (namespc
)->names
; t
; t
= TREE_CHAIN (t
))
4132 if (!DECL_IS_BUILTIN (t
) )
4133 collect_source_ref (DECL_SOURCE_FILE (t
));
4135 /* Dump siblings, if any */
4136 collect_source_refs (TREE_CHAIN (namespc
));
4138 /* Dump children, if any */
4139 collect_source_refs (NAMESPACE_LEVEL (namespc
)->namespaces
);
4142 /* Collect decls relevant to SOURCE_FILE from all namespaces recursively,
4143 starting from NAMESPC. */
4146 collect_ada_namespace (tree namespc
, const char *source_file
)
4151 /* Collect decls from this namespace */
4152 collect_ada_nodes (NAMESPACE_LEVEL (namespc
)->names
, source_file
);
4154 /* Collect siblings, if any */
4155 collect_ada_namespace (TREE_CHAIN (namespc
), source_file
);
4157 /* Collect children, if any */
4158 collect_ada_namespace (NAMESPACE_LEVEL (namespc
)->namespaces
, source_file
);
4161 /* Returns true iff there is a definition available for variable or
4165 decl_defined_p (tree decl
)
4167 if (TREE_CODE (decl
) == FUNCTION_DECL
)
4168 return (DECL_INITIAL (decl
) != NULL_TREE
);
4171 gcc_assert (VAR_P (decl
));
4172 return !DECL_EXTERNAL (decl
);
4176 /* Nonzero for a VAR_DECL whose value can be used in a constant expression.
4180 An integral constant-expression can only involve ... const
4181 variables of integral or enumeration types initialized with
4182 constant expressions ...
4184 C++0x also allows constexpr variables and temporaries initialized
4185 with constant expressions. We handle the former here, but the latter
4186 are just folded away in cxx_eval_constant_expression.
4188 The standard does not require that the expression be non-volatile.
4189 G++ implements the proposed correction in DR 457. */
4192 decl_constant_var_p (tree decl
)
4194 if (!decl_maybe_constant_var_p (decl
))
4197 /* We don't know if a template static data member is initialized with
4198 a constant expression until we instantiate its initializer. Even
4199 in the case of a constexpr variable, we can't treat it as a
4200 constant until its initializer is complete in case it's used in
4201 its own initializer. */
4203 return DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl
);
4206 /* Returns true if DECL could be a symbolic constant variable, depending on
4210 decl_maybe_constant_var_p (tree decl
)
4212 tree type
= TREE_TYPE (decl
);
4215 if (DECL_DECLARED_CONSTEXPR_P (decl
))
4217 return (CP_TYPE_CONST_NON_VOLATILE_P (type
)
4218 && INTEGRAL_OR_ENUMERATION_TYPE_P (type
));
4221 /* Complain that DECL uses a type with no linkage. In C++98 mode this is
4222 called from grokfndecl and grokvardecl; in all modes it is called from
4223 cp_write_global_declarations. */
4226 no_linkage_error (tree decl
)
4228 if (cxx_dialect
>= cxx11
&& decl_defined_p (decl
))
4229 /* In C++11 it's ok if the decl is defined. */
4231 tree t
= no_linkage_check (TREE_TYPE (decl
), /*relaxed_p=*/false);
4233 /* The type that got us on no_linkage_decls must have gotten a name for
4234 linkage purposes. */;
4235 else if (CLASS_TYPE_P (t
) && TYPE_BEING_DEFINED (t
))
4236 /* The type might end up having a typedef name for linkage purposes. */
4237 vec_safe_push (no_linkage_decls
, decl
);
4238 else if (TYPE_ANONYMOUS_P (t
))
4241 if (cxx_dialect
>= cxx11
)
4242 d
= permerror (DECL_SOURCE_LOCATION (decl
), "%q#D, declared using "
4243 "anonymous type, is used but never defined", decl
);
4244 else if (DECL_EXTERN_C_P (decl
))
4245 /* Allow this; it's pretty common in C. */;
4246 else if (VAR_P (decl
))
4247 /* DRs 132, 319 and 389 seem to indicate types with
4248 no linkage can only be used to declare extern "C"
4249 entities. Since it's not always an error in the
4250 ISO C++ 90 Standard, we only issue a warning. */
4251 d
= warning_at (DECL_SOURCE_LOCATION (decl
), 0, "anonymous type "
4252 "with no linkage used to declare variable %q#D with "
4255 d
= permerror (DECL_SOURCE_LOCATION (decl
), "anonymous type with no "
4256 "linkage used to declare function %q#D with linkage",
4258 if (d
&& is_typedef_decl (TYPE_NAME (t
)))
4259 inform (DECL_SOURCE_LOCATION (TYPE_NAME (t
)), "%q#D does not refer "
4260 "to the unqualified type, so it is not used for linkage",
4263 else if (cxx_dialect
>= cxx11
)
4265 if (VAR_P (decl
) || !DECL_PURE_VIRTUAL_P (decl
))
4266 permerror (DECL_SOURCE_LOCATION (decl
),
4267 "%q#D, declared using local type "
4268 "%qT, is used but never defined", decl
, t
);
4270 else if (VAR_P (decl
))
4271 warning_at (DECL_SOURCE_LOCATION (decl
), 0, "type %qT with no linkage "
4272 "used to declare variable %q#D with linkage", t
, decl
);
4274 permerror (DECL_SOURCE_LOCATION (decl
), "type %qT with no linkage used "
4275 "to declare function %q#D with linkage", t
, decl
);
4278 /* Collect declarations from all namespaces relevant to SOURCE_FILE. */
4281 collect_all_refs (const char *source_file
)
4283 collect_ada_namespace (global_namespace
, source_file
);
4286 /* Clear DECL_EXTERNAL for NODE. */
4289 clear_decl_external (struct cgraph_node
*node
, void * /*data*/)
4291 DECL_EXTERNAL (node
->decl
) = 0;
4295 /* Build up the function to run dynamic initializers for thread_local
4296 variables in this translation unit and alias the init functions for the
4297 individual variables to it. */
4300 handle_tls_init (void)
4302 tree vars
= prune_vars_needing_no_initialization (&tls_aggregates
);
4303 if (vars
== NULL_TREE
)
4306 location_t loc
= DECL_SOURCE_LOCATION (TREE_VALUE (vars
));
4308 write_out_vars (vars
);
4310 tree guard
= build_decl (loc
, VAR_DECL
, get_identifier ("__tls_guard"),
4312 TREE_PUBLIC (guard
) = false;
4313 TREE_STATIC (guard
) = true;
4314 DECL_ARTIFICIAL (guard
) = true;
4315 DECL_IGNORED_P (guard
) = true;
4316 TREE_USED (guard
) = true;
4317 CP_DECL_THREAD_LOCAL_P (guard
) = true;
4318 set_decl_tls_model (guard
, decl_default_tls_model (guard
));
4319 pushdecl_top_level_and_finish (guard
, NULL_TREE
);
4321 tree fn
= get_local_tls_init_fn ();
4322 start_preparsed_function (fn
, NULL_TREE
, SF_PRE_PARSED
);
4323 tree body
= begin_function_body ();
4324 tree if_stmt
= begin_if_stmt ();
4325 tree cond
= cp_build_unary_op (TRUTH_NOT_EXPR
, guard
, false,
4326 tf_warning_or_error
);
4327 finish_if_stmt_cond (cond
, if_stmt
);
4328 finish_expr_stmt (cp_build_modify_expr (guard
, NOP_EXPR
, boolean_true_node
,
4329 tf_warning_or_error
));
4330 for (; vars
; vars
= TREE_CHAIN (vars
))
4332 tree var
= TREE_VALUE (vars
);
4333 tree init
= TREE_PURPOSE (vars
);
4334 one_static_initialization_or_destruction (var
, init
, true);
4336 #ifdef ASM_OUTPUT_DEF
4337 /* Output init aliases even with -fno-extern-tls-init. */
4338 if (TREE_PUBLIC (var
))
4340 tree single_init_fn
= get_tls_init_fn (var
);
4341 if (single_init_fn
== NULL_TREE
)
4344 = cgraph_node::get_create (fn
)->create_same_body_alias
4345 (single_init_fn
, fn
);
4346 gcc_assert (alias
!= NULL
);
4351 finish_then_clause (if_stmt
);
4352 finish_if_stmt (if_stmt
);
4353 finish_function_body (body
);
4354 expand_or_defer_fn (finish_function (0));
4357 /* We're at the end of compilation, so generate any mangling aliases that
4358 we've been saving up, if DECL is going to be output and ID2 isn't
4359 already taken by another declaration. */
4362 generate_mangling_alias (tree decl
, tree id2
)
4364 /* If there's a declaration already using this mangled name,
4365 don't create a compatibility alias that conflicts. */
4366 if (IDENTIFIER_GLOBAL_VALUE (id2
))
4369 struct cgraph_node
*n
= NULL
;
4370 if (TREE_CODE (decl
) == FUNCTION_DECL
4371 && !(n
= cgraph_node::get (decl
)))
4372 /* Don't create an alias to an unreferenced function. */
4375 tree alias
= make_alias_for (decl
, id2
);
4376 SET_IDENTIFIER_GLOBAL_VALUE (id2
, alias
);
4377 DECL_IGNORED_P (alias
) = 1;
4378 TREE_PUBLIC (alias
) = TREE_PUBLIC (decl
);
4379 DECL_VISIBILITY (alias
) = DECL_VISIBILITY (decl
);
4380 if (vague_linkage_p (decl
))
4381 DECL_WEAK (alias
) = 1;
4382 if (TREE_CODE (decl
) == FUNCTION_DECL
)
4383 n
->create_same_body_alias (alias
, decl
);
4385 varpool_node::create_extra_name_alias (alias
, decl
);
4388 /* Note that we might want to emit an alias with the symbol ID2 for DECL at
4389 the end of translation, for compatibility across bugs in the mangling
4393 note_mangling_alias (tree decl ATTRIBUTE_UNUSED
, tree id2 ATTRIBUTE_UNUSED
)
4395 #ifdef ASM_OUTPUT_DEF
4397 generate_mangling_alias (decl
, id2
);
4400 vec_safe_push (mangling_aliases
, decl
);
4401 vec_safe_push (mangling_aliases
, id2
);
4407 generate_mangling_aliases ()
4409 while (!vec_safe_is_empty (mangling_aliases
))
4411 tree id2
= mangling_aliases
->pop();
4412 tree decl
= mangling_aliases
->pop();
4413 generate_mangling_alias (decl
, id2
);
4417 /* The entire file is now complete. If requested, dump everything
4424 FILE *stream
= dump_begin (TDI_tu
, &flags
);
4428 dump_node (global_namespace
, flags
& ~TDF_SLIM
, stream
);
4429 dump_end (TDI_tu
, stream
);
4433 static location_t locus_at_end_of_parsing
;
4435 /* Check the deallocation functions for CODE to see if we want to warn that
4436 only one was defined. */
4439 maybe_warn_sized_delete (enum tree_code code
)
4441 tree sized
= NULL_TREE
;
4442 tree unsized
= NULL_TREE
;
4444 for (tree ovl
= IDENTIFIER_GLOBAL_VALUE (ansi_opname (code
));
4445 ovl
; ovl
= OVL_NEXT (ovl
))
4447 tree fn
= OVL_CURRENT (ovl
);
4448 /* We're only interested in usual deallocation functions. */
4449 if (!non_placement_deallocation_fn_p (fn
))
4451 if (FUNCTION_ARG_CHAIN (fn
) == void_list_node
)
4456 if (DECL_INITIAL (unsized
) && !DECL_INITIAL (sized
))
4457 warning_at (DECL_SOURCE_LOCATION (unsized
), OPT_Wsized_deallocation
,
4458 "the program should also define %qD", sized
);
4459 else if (!DECL_INITIAL (unsized
) && DECL_INITIAL (sized
))
4460 warning_at (DECL_SOURCE_LOCATION (sized
), OPT_Wsized_deallocation
,
4461 "the program should also define %qD", unsized
);
4464 /* Check the global deallocation functions to see if we want to warn about
4465 defining unsized without sized (or vice versa). */
4468 maybe_warn_sized_delete ()
4470 if (!flag_sized_deallocation
|| !warn_sized_deallocation
)
4472 maybe_warn_sized_delete (DELETE_EXPR
);
4473 maybe_warn_sized_delete (VEC_DELETE_EXPR
);
4476 /* Earlier we left PTRMEM_CST in variable initializers alone so that we could
4477 look them up when evaluating non-type template parameters. Now we need to
4478 lower them to something the back end can understand. */
4484 FOR_EACH_VARIABLE (node
)
4486 tree d
= node
->decl
;
4487 if (tree init
= DECL_INITIAL (d
))
4488 DECL_INITIAL (d
) = cplus_expand_constant (init
);
4492 /* This routine is called at the end of compilation.
4493 Its job is to create all the code needed to initialize and
4494 destroy the global aggregates. We do the destruction
4495 first, since that way we only need to reverse the decls once. */
4498 c_parse_final_cleanups (void)
4503 unsigned ssdf_count
= 0;
4507 locus_at_end_of_parsing
= input_location
;
4510 /* Bad parse errors. Just forget about it. */
4511 if (! global_bindings_p () || current_class_type
4512 || !vec_safe_is_empty (decl_namespace_list
))
4515 /* This is the point to write out a PCH if we're doing that.
4516 In that case we do not want to do anything else. */
4519 /* Mangle all symbols at PCH creation time. */
4521 FOR_EACH_SYMBOL (node
)
4522 if (! is_a
<varpool_node
*> (node
)
4523 || ! DECL_HARD_REGISTER (node
->decl
))
4524 DECL_ASSEMBLER_NAME (node
->decl
);
4525 c_common_write_pch ();
4530 timevar_stop (TV_PHASE_PARSING
);
4531 timevar_start (TV_PHASE_DEFERRED
);
4533 symtab
->process_same_body_aliases ();
4535 /* Handle -fdump-ada-spec[-slim] */
4536 if (flag_dump_ada_spec
|| flag_dump_ada_spec_slim
)
4538 if (flag_dump_ada_spec_slim
)
4539 collect_source_ref (main_input_filename
);
4541 collect_source_refs (global_namespace
);
4543 dump_ada_specs (collect_all_refs
, cpp_check
);
4546 /* FIXME - huh? was input_line -= 1;*/
4548 /* We now have to write out all the stuff we put off writing out.
4551 o Template specializations that we have not yet instantiated,
4552 but which are needed.
4553 o Initialization and destruction for non-local objects with
4554 static storage duration. (Local objects with static storage
4555 duration are initialized when their scope is first entered,
4556 and are cleaned up via atexit.)
4557 o Virtual function tables.
4559 All of these may cause others to be needed. For example,
4560 instantiating one function may cause another to be needed, and
4561 generating the initializer for an object may cause templates to be
4562 instantiated, etc., etc. */
4564 emit_support_tinfos ();
4573 /* If there are templates that we've put off instantiating, do
4575 instantiate_pending_templates (retries
);
4578 /* Write out virtual tables as required. Note that writing out
4579 the virtual table for a template class may cause the
4580 instantiation of members of that class. If we write out
4581 vtables then we remove the class from our list so we don't
4582 have to look at it again. */
4584 while (keyed_classes
!= NULL_TREE
4585 && maybe_emit_vtables (TREE_VALUE (keyed_classes
)))
4588 keyed_classes
= TREE_CHAIN (keyed_classes
);
4594 tree next
= TREE_CHAIN (t
);
4598 if (maybe_emit_vtables (TREE_VALUE (next
)))
4601 TREE_CHAIN (t
) = TREE_CHAIN (next
);
4606 next
= TREE_CHAIN (t
);
4610 /* Write out needed type info variables. We have to be careful
4611 looping through unemitted decls, because emit_tinfo_decl may
4612 cause other variables to be needed. New elements will be
4613 appended, and we remove from the vector those that actually
4615 for (i
= unemitted_tinfo_decls
->length ();
4616 unemitted_tinfo_decls
->iterate (--i
, &t
);)
4617 if (emit_tinfo_decl (t
))
4620 unemitted_tinfo_decls
->unordered_remove (i
);
4623 /* The list of objects with static storage duration is built up
4624 in reverse order. We clear STATIC_AGGREGATES so that any new
4625 aggregates added during the initialization of these will be
4626 initialized in the correct order when we next come around the
4628 vars
= prune_vars_needing_no_initialization (&static_aggregates
);
4632 /* We need to start a new initialization function each time
4633 through the loop. That's because we need to know which
4634 vtables have been referenced, and TREE_SYMBOL_REFERENCED
4635 isn't computed until a function is finished, and written
4636 out. That's a deficiency in the back end. When this is
4637 fixed, these initialization functions could all become
4638 inline, with resulting performance improvements. */
4641 /* Set the line and file, so that it is obviously not from
4643 input_location
= locus_at_end_of_parsing
;
4644 ssdf_body
= start_static_storage_duration_function (ssdf_count
);
4646 /* Make sure the back end knows about all the variables. */
4647 write_out_vars (vars
);
4649 /* First generate code to do all the initializations. */
4651 do_static_initialization_or_destruction (vars
, /*initp=*/true);
4653 /* Then, generate code to do all the destructions. Do these
4654 in reverse order so that the most recently constructed
4655 variable is the first destroyed. If we're using
4656 __cxa_atexit, then we don't need to do this; functions
4657 were registered at initialization time to destroy the
4659 if (!flag_use_cxa_atexit
&& vars
)
4661 vars
= nreverse (vars
);
4662 do_static_initialization_or_destruction (vars
, /*initp=*/false);
4667 /* Finish up the static storage duration function for this
4669 input_location
= locus_at_end_of_parsing
;
4670 finish_static_storage_duration_function (ssdf_body
);
4672 /* All those initializations and finalizations might cause
4673 us to need more inline functions, more template
4674 instantiations, etc. */
4677 /* ??? was: locus_at_end_of_parsing.line++; */
4680 /* Now do the same for thread_local variables. */
4683 /* Go through the set of inline functions whose bodies have not
4684 been emitted yet. If out-of-line copies of these functions
4685 are required, emit them. */
4686 FOR_EACH_VEC_SAFE_ELT (deferred_fns
, i
, decl
)
4688 /* Does it need synthesizing? */
4689 if (DECL_DEFAULTED_FN (decl
) && ! DECL_INITIAL (decl
)
4690 && (! DECL_REALLY_EXTERN (decl
) || possibly_inlined_p (decl
)))
4692 /* Even though we're already at the top-level, we push
4693 there again. That way, when we pop back a few lines
4694 hence, all of our state is restored. Otherwise,
4695 finish_function doesn't clean things up, and we end
4696 up with CURRENT_FUNCTION_DECL set. */
4697 push_to_top_level ();
4698 /* The decl's location will mark where it was first
4699 needed. Save that so synthesize method can indicate
4700 where it was needed from, in case of error */
4701 input_location
= DECL_SOURCE_LOCATION (decl
);
4702 synthesize_method (decl
);
4703 pop_from_top_level ();
4707 if (!DECL_INITIAL (decl
) && decl_tls_wrapper_p (decl
))
4708 generate_tls_wrapper (decl
);
4710 if (!DECL_SAVED_TREE (decl
))
4713 /* We lie to the back end, pretending that some functions
4714 are not defined when they really are. This keeps these
4715 functions from being put out unnecessarily. But, we must
4716 stop lying when the functions are referenced, or if they
4717 are not comdat since they need to be put out now. If
4718 DECL_INTERFACE_KNOWN, then we have already set
4719 DECL_EXTERNAL appropriately, so there's no need to check
4720 again, and we do not want to clear DECL_EXTERNAL if a
4721 previous call to import_export_decl set it.
4723 This is done in a separate for cycle, because if some
4724 deferred function is contained in another deferred
4725 function later in deferred_fns varray,
4726 rest_of_compilation would skip this function and we
4727 really cannot expand the same function twice. */
4728 import_export_decl (decl
);
4729 if (DECL_NOT_REALLY_EXTERN (decl
)
4730 && DECL_INITIAL (decl
)
4731 && decl_needed_p (decl
))
4733 struct cgraph_node
*node
, *next
;
4735 node
= cgraph_node::get (decl
);
4736 if (node
->cpp_implicit_alias
)
4737 node
= node
->get_alias_target ();
4739 node
->call_for_symbol_thunks_and_aliases (clear_decl_external
,
4741 /* If we mark !DECL_EXTERNAL one of the symbols in some comdat
4742 group, we need to mark all symbols in the same comdat group
4744 if (node
->same_comdat_group
)
4745 for (next
= dyn_cast
<cgraph_node
*> (node
->same_comdat_group
);
4747 next
= dyn_cast
<cgraph_node
*> (next
->same_comdat_group
))
4748 next
->call_for_symbol_thunks_and_aliases (clear_decl_external
,
4752 /* If we're going to need to write this function out, and
4753 there's already a body for it, create RTL for it now.
4754 (There might be no body if this is a method we haven't
4755 gotten around to synthesizing yet.) */
4756 if (!DECL_EXTERNAL (decl
)
4757 && decl_needed_p (decl
)
4758 && !TREE_ASM_WRITTEN (decl
)
4759 && !cgraph_node::get (decl
)->definition
)
4761 /* We will output the function; no longer consider it in this
4763 DECL_DEFER_OUTPUT (decl
) = 0;
4764 /* Generate RTL for this function now that we know we
4766 expand_or_defer_fn (decl
);
4767 /* If we're compiling -fsyntax-only pretend that this
4768 function has been written out so that we don't try to
4770 if (flag_syntax_only
)
4771 TREE_ASM_WRITTEN (decl
) = 1;
4776 if (walk_namespaces (wrapup_globals_for_namespace
, /*data=*/0))
4779 /* Static data members are just like namespace-scope globals. */
4780 FOR_EACH_VEC_SAFE_ELT (pending_statics
, i
, decl
)
4782 if (var_finalized_p (decl
) || DECL_REALLY_EXTERN (decl
)
4783 /* Don't write it out if we haven't seen a definition. */
4784 || DECL_IN_AGGR_P (decl
))
4786 import_export_decl (decl
);
4787 /* If this static data member is needed, provide it to the
4789 if (DECL_NOT_REALLY_EXTERN (decl
) && decl_needed_p (decl
))
4790 DECL_EXTERNAL (decl
) = 0;
4792 if (vec_safe_length (pending_statics
) != 0
4793 && wrapup_global_declarations (pending_statics
->address (),
4794 pending_statics
->length ()))
4803 generate_mangling_aliases ();
4805 /* All used inline functions must have a definition at this point. */
4806 FOR_EACH_VEC_SAFE_ELT (deferred_fns
, i
, decl
)
4808 if (/* Check online inline functions that were actually used. */
4809 DECL_ODR_USED (decl
) && DECL_DECLARED_INLINE_P (decl
)
4810 /* If the definition actually was available here, then the
4811 fact that the function was not defined merely represents
4812 that for some reason (use of a template repository,
4813 #pragma interface, etc.) we decided not to emit the
4815 && !DECL_INITIAL (decl
)
4816 /* Don't complain if the template was defined. */
4817 && !(DECL_TEMPLATE_INSTANTIATION (decl
)
4818 && DECL_INITIAL (DECL_TEMPLATE_RESULT
4819 (template_for_substitution (decl
)))))
4821 warning_at (DECL_SOURCE_LOCATION (decl
), 0,
4822 "inline function %qD used but never defined", decl
);
4823 /* Avoid a duplicate warning from check_global_declaration. */
4824 TREE_NO_WARNING (decl
) = 1;
4828 /* So must decls that use a type with no linkage. */
4829 FOR_EACH_VEC_SAFE_ELT (no_linkage_decls
, i
, decl
)
4830 no_linkage_error (decl
);
4832 maybe_warn_sized_delete ();
4834 /* Then, do the Objective-C stuff. This is where all the
4835 Objective-C module stuff gets generated (symtab,
4836 class/protocol/selector lists etc). This must be done after C++
4837 templates, destructors etc. so that selectors used in C++
4838 templates are properly allocated. */
4839 if (c_dialect_objc ())
4840 objc_write_global_declarations ();
4842 /* We give C linkage to static constructors and destructors. */
4843 push_lang_context (lang_name_c
);
4845 /* Generate initialization and destruction functions for all
4846 priorities for which they are required. */
4847 if (priority_info_map
)
4848 splay_tree_foreach (priority_info_map
,
4849 generate_ctor_and_dtor_functions_for_priority
,
4850 /*data=*/&locus_at_end_of_parsing
);
4851 else if (c_dialect_objc () && objc_static_init_needed_p ())
4852 /* If this is obj-c++ and we need a static init, call
4853 generate_ctor_or_dtor_function. */
4854 generate_ctor_or_dtor_function (/*constructor_p=*/true,
4855 DEFAULT_INIT_PRIORITY
,
4856 &locus_at_end_of_parsing
);
4858 /* We're done with the splay-tree now. */
4859 if (priority_info_map
)
4860 splay_tree_delete (priority_info_map
);
4862 /* Generate any missing aliases. */
4863 maybe_apply_pending_pragma_weaks ();
4865 /* We're done with static constructors, so we can go back to "C++"
4867 pop_lang_context ();
4869 /* Generate Java hidden aliases. */
4870 build_java_method_aliases ();
4872 if (flag_vtable_verify
)
4874 vtv_recover_class_info ();
4875 vtv_compute_class_hierarchy_transitive_closure ();
4876 vtv_build_vtable_verify_fndecl ();
4879 perform_deferred_noexcept_checks ();
4883 /* The entire file is now complete. If requested, dump everything
4887 if (flag_detailed_statistics
)
4889 dump_tree_statistics ();
4890 dump_time_statistics ();
4893 timevar_stop (TV_PHASE_DEFERRED
);
4894 timevar_start (TV_PHASE_PARSING
);
4896 /* Indicate that we're done with front end processing. */
4900 /* Perform any post compilation-proper cleanups for the C++ front-end.
4901 This should really go away. No front-end should need to do
4902 anything past the compilation process. */
4905 cxx_post_compilation_parsing_cleanups (void)
4907 timevar_start (TV_PHASE_LATE_PARSING_CLEANUPS
);
4909 if (flag_vtable_verify
)
4911 /* Generate the special constructor initialization function that
4912 calls __VLTRegisterPairs, and give it a very high
4913 initialization priority. This must be done after
4914 finalize_compilation_unit so that we have accurate
4915 information about which vtable will actually be emitted. */
4916 vtv_generate_init_routine ();
4919 input_location
= locus_at_end_of_parsing
;
4922 validate_conversion_obstack ();
4924 timevar_stop (TV_PHASE_LATE_PARSING_CLEANUPS
);
4927 /* FN is an OFFSET_REF, DOTSTAR_EXPR or MEMBER_REF indicating the
4928 function to call in parse-tree form; it has not yet been
4929 semantically analyzed. ARGS are the arguments to the function.
4930 They have already been semantically analyzed. This may change
4934 build_offset_ref_call_from_tree (tree fn
, vec
<tree
, va_gc
> **args
,
4935 tsubst_flags_t complain
)
4938 vec
<tree
, va_gc
> *orig_args
= NULL
;
4943 object
= TREE_OPERAND (fn
, 0);
4945 if (processing_template_decl
)
4947 gcc_assert (TREE_CODE (fn
) == DOTSTAR_EXPR
4948 || TREE_CODE (fn
) == MEMBER_REF
);
4949 if (type_dependent_expression_p (fn
)
4950 || any_type_dependent_arguments_p (*args
))
4951 return build_nt_call_vec (fn
, *args
);
4953 orig_args
= make_tree_vector_copy (*args
);
4955 /* Transform the arguments and add the implicit "this"
4956 parameter. That must be done before the FN is transformed
4957 because we depend on the form of FN. */
4958 make_args_non_dependent (*args
);
4959 object
= build_non_dependent_expr (object
);
4960 if (TREE_CODE (TREE_TYPE (fn
)) == METHOD_TYPE
)
4962 if (TREE_CODE (fn
) == DOTSTAR_EXPR
)
4963 object
= cp_build_addr_expr (object
, complain
);
4964 vec_safe_insert (*args
, 0, object
);
4966 /* Now that the arguments are done, transform FN. */
4967 fn
= build_non_dependent_expr (fn
);
4970 /* A qualified name corresponding to a bound pointer-to-member is
4971 represented as an OFFSET_REF:
4973 struct B { void g(); };
4975 void B::g() { (this->*p)(); } */
4976 if (TREE_CODE (fn
) == OFFSET_REF
)
4978 tree object_addr
= cp_build_addr_expr (object
, complain
);
4979 fn
= TREE_OPERAND (fn
, 1);
4980 fn
= get_member_function_from_ptrfunc (&object_addr
, fn
,
4982 vec_safe_insert (*args
, 0, object_addr
);
4985 if (CLASS_TYPE_P (TREE_TYPE (fn
)))
4986 expr
= build_op_call (fn
, args
, complain
);
4988 expr
= cp_build_function_call_vec (fn
, args
, complain
);
4989 if (processing_template_decl
&& expr
!= error_mark_node
)
4990 expr
= build_min_non_dep_call_vec (expr
, orig_fn
, orig_args
);
4992 if (orig_args
!= NULL
)
4993 release_tree_vector (orig_args
);
5000 check_default_args (tree x
)
5002 tree arg
= TYPE_ARG_TYPES (TREE_TYPE (x
));
5003 bool saw_def
= false;
5004 int i
= 0 - (TREE_CODE (TREE_TYPE (x
)) == METHOD_TYPE
);
5005 for (; arg
&& arg
!= void_list_node
; arg
= TREE_CHAIN (arg
), ++i
)
5007 if (TREE_PURPOSE (arg
))
5009 else if (saw_def
&& !PACK_EXPANSION_P (TREE_VALUE (arg
)))
5011 error ("default argument missing for parameter %P of %q+#D", i
, x
);
5012 TREE_PURPOSE (arg
) = error_mark_node
;
5017 /* Return true if function DECL can be inlined. This is used to force
5018 instantiation of methods that might be interesting for inlining. */
5020 possibly_inlined_p (tree decl
)
5022 gcc_assert (TREE_CODE (decl
) == FUNCTION_DECL
);
5023 if (DECL_UNINLINABLE (decl
))
5025 if (!optimize
|| pragma_java_exceptions
)
5026 return DECL_DECLARED_INLINE_P (decl
);
5027 /* When optimizing, we might inline everything when flatten
5028 attribute or heuristics inlining for size or autoinlining
5033 /* Mark DECL (either a _DECL or a BASELINK) as "used" in the program.
5034 If DECL is a specialization or implicitly declared class member,
5035 generate the actual definition. Return false if something goes
5036 wrong, true otherwise. */
5039 mark_used (tree decl
, tsubst_flags_t complain
)
5041 /* If DECL is a BASELINK for a single function, then treat it just
5042 like the DECL for the function. Otherwise, if the BASELINK is
5043 for an overloaded function, we don't know which function was
5044 actually used until after overload resolution. */
5045 if (BASELINK_P (decl
))
5047 decl
= BASELINK_FUNCTIONS (decl
);
5048 if (really_overloaded_fn (decl
))
5050 decl
= OVL_CURRENT (decl
);
5053 /* Set TREE_USED for the benefit of -Wunused. */
5054 TREE_USED (decl
) = 1;
5055 if (DECL_CLONED_FUNCTION_P (decl
))
5056 TREE_USED (DECL_CLONED_FUNCTION (decl
)) = 1;
5058 /* Mark enumeration types as used. */
5059 if (TREE_CODE (decl
) == CONST_DECL
)
5060 used_types_insert (DECL_CONTEXT (decl
));
5062 if (TREE_CODE (decl
) == FUNCTION_DECL
)
5063 maybe_instantiate_noexcept (decl
);
5065 if (TREE_CODE (decl
) == FUNCTION_DECL
5066 && DECL_DELETED_FN (decl
))
5068 if (DECL_ARTIFICIAL (decl
))
5070 if (DECL_OVERLOADED_OPERATOR_P (decl
) == TYPE_EXPR
5071 && LAMBDA_TYPE_P (DECL_CONTEXT (decl
)))
5073 /* We mark a lambda conversion op as deleted if we can't
5074 generate it properly; see maybe_add_lambda_conv_op. */
5075 sorry ("converting lambda which uses %<...%> to "
5076 "function pointer");
5080 if (complain
& tf_error
)
5082 error ("use of deleted function %qD", decl
);
5083 if (!maybe_explain_implicit_delete (decl
))
5084 inform (DECL_SOURCE_LOCATION (decl
), "declared here");
5089 if (TREE_DEPRECATED (decl
) && (complain
& tf_warning
)
5090 && deprecated_state
!= DEPRECATED_SUPPRESS
)
5091 warn_deprecated_use (decl
, NULL_TREE
);
5093 /* We can only check DECL_ODR_USED on variables or functions with
5094 DECL_LANG_SPECIFIC set, and these are also the only decls that we
5095 might need special handling for. */
5096 if (!VAR_OR_FUNCTION_DECL_P (decl
)
5097 || DECL_LANG_SPECIFIC (decl
) == NULL
5098 || DECL_THUNK_P (decl
))
5100 if (!processing_template_decl
&& type_uses_auto (TREE_TYPE (decl
)))
5102 if (complain
& tf_error
)
5103 error ("use of %qD before deduction of %<auto%>", decl
);
5109 /* We only want to do this processing once. We don't need to keep trying
5110 to instantiate inline templates, because unit-at-a-time will make sure
5111 we get them compiled before functions that want to inline them. */
5112 if (DECL_ODR_USED (decl
))
5115 /* If within finish_function, defer the rest until that function
5116 finishes, otherwise it might recurse. */
5117 if (defer_mark_used_calls
)
5119 vec_safe_push (deferred_mark_used_calls
, decl
);
5123 /* Normally, we can wait until instantiation-time to synthesize DECL.
5124 However, if DECL is a static data member initialized with a constant
5125 or a constexpr function, we need it right now because a reference to
5126 such a data member or a call to such function is not value-dependent.
5127 For a function that uses auto in the return type, we need to instantiate
5128 it to find out its type. For OpenMP user defined reductions, we need
5129 them instantiated for reduction clauses which inline them by hand
5131 if (DECL_LANG_SPECIFIC (decl
)
5132 && DECL_TEMPLATE_INFO (decl
)
5133 && (decl_maybe_constant_var_p (decl
)
5134 || (TREE_CODE (decl
) == FUNCTION_DECL
5135 && DECL_OMP_DECLARE_REDUCTION_P (decl
))
5136 || undeduced_auto_decl (decl
))
5137 && !DECL_DECLARED_CONCEPT_P (decl
)
5138 && !uses_template_parms (DECL_TI_ARGS (decl
)))
5140 /* Instantiating a function will result in garbage collection. We
5141 must treat this situation as if we were within the body of a
5142 function so as to avoid collecting live data only referenced from
5143 the stack (such as overload resolution candidates). */
5145 instantiate_decl (decl
, /*defer_ok=*/false,
5146 /*expl_inst_class_mem_p=*/false);
5150 if (processing_template_decl
|| in_template_function ())
5153 /* Check this too in case we're within instantiate_non_dependent_expr. */
5154 if (DECL_TEMPLATE_INFO (decl
)
5155 && uses_template_parms (DECL_TI_ARGS (decl
)))
5158 if (undeduced_auto_decl (decl
))
5160 if (complain
& tf_error
)
5161 error ("use of %qD before deduction of %<auto%>", decl
);
5165 /* If we don't need a value, then we don't need to synthesize DECL. */
5166 if (cp_unevaluated_operand
!= 0)
5169 DECL_ODR_USED (decl
) = 1;
5170 if (DECL_CLONED_FUNCTION_P (decl
))
5171 DECL_ODR_USED (DECL_CLONED_FUNCTION (decl
)) = 1;
5173 /* DR 757: A type without linkage shall not be used as the type of a
5174 variable or function with linkage, unless
5175 o the variable or function has extern "C" linkage (7.5 [dcl.link]), or
5176 o the variable or function is not used (3.2 [basic.def.odr]) or is
5177 defined in the same translation unit. */
5178 if (cxx_dialect
> cxx98
5179 && decl_linkage (decl
) != lk_none
5180 && !DECL_EXTERN_C_P (decl
)
5181 && !DECL_ARTIFICIAL (decl
)
5182 && !decl_defined_p (decl
)
5183 && no_linkage_check (TREE_TYPE (decl
), /*relaxed_p=*/false))
5185 if (is_local_extern (decl
))
5186 /* There's no way to define a local extern, and adding it to
5187 the vector interferes with GC, so give an error now. */
5188 no_linkage_error (decl
);
5190 vec_safe_push (no_linkage_decls
, decl
);
5193 if (TREE_CODE (decl
) == FUNCTION_DECL
&& DECL_DECLARED_INLINE_P (decl
)
5194 && !DECL_INITIAL (decl
) && !DECL_ARTIFICIAL (decl
))
5195 /* Remember it, so we can check it was defined. */
5196 note_vague_linkage_fn (decl
);
5198 /* Is it a synthesized method that needs to be synthesized? */
5199 if (TREE_CODE (decl
) == FUNCTION_DECL
5200 && DECL_NONSTATIC_MEMBER_FUNCTION_P (decl
)
5201 && DECL_DEFAULTED_FN (decl
)
5202 /* A function defaulted outside the class is synthesized either by
5203 cp_finish_decl or instantiate_decl. */
5204 && !DECL_DEFAULTED_OUTSIDE_CLASS_P (decl
)
5205 && ! DECL_INITIAL (decl
))
5207 /* Defer virtual destructors so that thunks get the right
5209 if (DECL_VIRTUAL_P (decl
) && !at_eof
)
5211 note_vague_linkage_fn (decl
);
5215 /* Remember the current location for a function we will end up
5216 synthesizing. Then we can inform the user where it was
5217 required in the case of error. */
5218 DECL_SOURCE_LOCATION (decl
) = input_location
;
5220 /* Synthesizing an implicitly defined member function will result in
5221 garbage collection. We must treat this situation as if we were
5222 within the body of a function so as to avoid collecting live data
5223 on the stack (such as overload resolution candidates).
5225 We could just let cp_write_global_declarations handle synthesizing
5226 this function by adding it to deferred_fns, but doing
5227 it at the use site produces better error messages. */
5229 synthesize_method (decl
);
5231 /* If this is a synthesized method we don't need to
5232 do the instantiation test below. */
5234 else if (VAR_OR_FUNCTION_DECL_P (decl
)
5235 && DECL_TEMPLATE_INFO (decl
)
5236 && !DECL_DECLARED_CONCEPT_P (decl
)
5237 && (!DECL_EXPLICIT_INSTANTIATION (decl
)
5238 || always_instantiate_p (decl
)))
5239 /* If this is a function or variable that is an instance of some
5240 template, we now know that we will need to actually do the
5241 instantiation. We check that DECL is not an explicit
5242 instantiation because that is not checked in instantiate_decl.
5244 We put off instantiating functions in order to improve compile
5245 times. Maintaining a stack of active functions is expensive,
5246 and the inliner knows to instantiate any functions it might
5247 need. Therefore, we always try to defer instantiation. */
5250 instantiate_decl (decl
, /*defer_ok=*/true,
5251 /*expl_inst_class_mem_p=*/false);
5259 mark_used (tree decl
)
5261 return mark_used (decl
, tf_warning_or_error
);
5265 vtv_start_verification_constructor_init_function (void)
5267 return start_objects ('I', MAX_RESERVED_INIT_PRIORITY
- 1);
5271 vtv_finish_verification_constructor_init_function (tree function_body
)
5275 finish_compound_stmt (function_body
);
5276 fn
= finish_function (0);
5277 DECL_STATIC_CONSTRUCTOR (fn
) = 1;
5278 decl_init_priority_insert (fn
, MAX_RESERVED_INIT_PRIORITY
- 1);
5283 #include "gt-cp-decl2.h"