1 /* Process declarations and variables for C++ compiler.
2 Copyright (C) 1988-2013 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"
41 #include "c-family/c-common.h"
42 #include "c-family/c-objc.h"
44 #include "tree-inline.h"
45 #include "c-family/c-pragma.h"
49 #include "pointer-set.h"
50 #include "splay-tree.h"
51 #include "langhooks.h"
52 #include "c-family/c-ada-spec.h"
54 extern cpp_reader
*parse_in
;
56 /* This structure contains information about the initializations
57 and/or destructions required for a particular priority level. */
58 typedef struct priority_info_s
{
59 /* Nonzero if there have been any initializations at this priority
60 throughout the translation unit. */
61 int initializations_p
;
62 /* Nonzero if there have been any destructions at this priority
63 throughout the translation unit. */
67 static void mark_vtable_entries (tree
);
68 static bool maybe_emit_vtables (tree
);
69 static bool acceptable_java_type (tree
);
70 static tree
start_objects (int, int);
71 static void finish_objects (int, int, tree
);
72 static tree
start_static_storage_duration_function (unsigned);
73 static void finish_static_storage_duration_function (tree
);
74 static priority_info
get_priority_info (int);
75 static void do_static_initialization_or_destruction (tree
, bool);
76 static void one_static_initialization_or_destruction (tree
, tree
, bool);
77 static void generate_ctor_or_dtor_function (bool, int, location_t
*);
78 static int generate_ctor_and_dtor_functions_for_priority (splay_tree_node
,
80 static tree
prune_vars_needing_no_initialization (tree
*);
81 static void write_out_vars (tree
);
82 static void import_export_class (tree
);
83 static tree
get_guard_bits (tree
);
84 static void determine_visibility_from_class (tree
, tree
);
85 static bool determine_hidden_inline (tree
);
86 static bool decl_defined_p (tree
);
88 /* A list of static class variables. This is needed, because a
89 static class variable can be declared inside the class without
90 an initializer, and then initialized, statically, outside the class. */
91 static GTY(()) vec
<tree
, va_gc
> *pending_statics
;
93 /* A list of functions which were declared inline, but which we
94 may need to emit outline anyway. */
95 static GTY(()) vec
<tree
, va_gc
> *deferred_fns
;
97 /* A list of decls that use types with no linkage, which we need to make
99 static GTY(()) vec
<tree
, va_gc
> *no_linkage_decls
;
103 /* Return a member function type (a METHOD_TYPE), given FNTYPE (a
104 FUNCTION_TYPE), CTYPE (class type), and QUALS (the cv-qualifiers
105 that apply to the function). */
108 build_memfn_type (tree fntype
, tree ctype
, cp_cv_quals quals
)
114 if (fntype
== error_mark_node
|| ctype
== error_mark_node
)
115 return error_mark_node
;
117 gcc_assert (TREE_CODE (fntype
) == FUNCTION_TYPE
118 || TREE_CODE (fntype
) == METHOD_TYPE
);
120 type_quals
= quals
& ~TYPE_QUAL_RESTRICT
;
121 ctype
= cp_build_qualified_type (ctype
, type_quals
);
122 raises
= TYPE_RAISES_EXCEPTIONS (fntype
);
123 attrs
= TYPE_ATTRIBUTES (fntype
);
124 fntype
= build_method_type_directly (ctype
, TREE_TYPE (fntype
),
125 (TREE_CODE (fntype
) == METHOD_TYPE
126 ? TREE_CHAIN (TYPE_ARG_TYPES (fntype
))
127 : TYPE_ARG_TYPES (fntype
)));
129 fntype
= build_exception_variant (fntype
, raises
);
131 fntype
= cp_build_type_attribute_variant (fntype
, attrs
);
136 /* Return a variant of FNTYPE, a FUNCTION_TYPE or METHOD_TYPE, with its
137 return type changed to NEW_RET. */
140 change_return_type (tree new_ret
, tree fntype
)
143 tree args
= TYPE_ARG_TYPES (fntype
);
144 tree raises
= TYPE_RAISES_EXCEPTIONS (fntype
);
145 tree attrs
= TYPE_ATTRIBUTES (fntype
);
147 if (new_ret
== error_mark_node
)
150 if (same_type_p (new_ret
, TREE_TYPE (fntype
)))
153 if (TREE_CODE (fntype
) == FUNCTION_TYPE
)
155 newtype
= build_function_type (new_ret
, args
);
156 newtype
= apply_memfn_quals (newtype
, type_memfn_quals (fntype
));
159 newtype
= build_method_type_directly
160 (class_of_this_parm (fntype
), new_ret
, TREE_CHAIN (args
));
162 newtype
= build_exception_variant (newtype
, raises
);
164 newtype
= cp_build_type_attribute_variant (newtype
, attrs
);
169 /* Build a PARM_DECL with NAME and TYPE, and set DECL_ARG_TYPE
173 cp_build_parm_decl (tree name
, tree type
)
175 tree parm
= build_decl (input_location
,
176 PARM_DECL
, name
, type
);
177 /* DECL_ARG_TYPE is only used by the back end and the back end never
179 if (!processing_template_decl
)
180 DECL_ARG_TYPE (parm
) = type_passed_as (type
);
182 /* If the type is a pack expansion, then we have a function
184 if (type
&& TREE_CODE (type
) == TYPE_PACK_EXPANSION
)
185 FUNCTION_PARAMETER_PACK_P (parm
) = 1;
190 /* Returns a PARM_DECL for a parameter of the indicated TYPE, with the
194 build_artificial_parm (tree name
, tree type
)
196 tree parm
= cp_build_parm_decl (name
, type
);
197 DECL_ARTIFICIAL (parm
) = 1;
198 /* All our artificial parms are implicitly `const'; they cannot be
200 TREE_READONLY (parm
) = 1;
204 /* Constructors for types with virtual baseclasses need an "in-charge" flag
205 saying whether this constructor is responsible for initialization of
206 virtual baseclasses or not. All destructors also need this "in-charge"
207 flag, which additionally determines whether or not the destructor should
208 free the memory for the object.
210 This function adds the "in-charge" flag to member function FN if
211 appropriate. It is called from grokclassfn and tsubst.
212 FN must be either a constructor or destructor.
214 The in-charge flag follows the 'this' parameter, and is followed by the
215 VTT parm (if any), then the user-written parms. */
218 maybe_retrofit_in_chrg (tree fn
)
220 tree basetype
, arg_types
, parms
, parm
, fntype
;
222 /* If we've already add the in-charge parameter don't do it again. */
223 if (DECL_HAS_IN_CHARGE_PARM_P (fn
))
226 /* When processing templates we can't know, in general, whether or
227 not we're going to have virtual baseclasses. */
228 if (processing_template_decl
)
231 /* We don't need an in-charge parameter for constructors that don't
232 have virtual bases. */
233 if (DECL_CONSTRUCTOR_P (fn
)
234 && !CLASSTYPE_VBASECLASSES (DECL_CONTEXT (fn
)))
237 arg_types
= TYPE_ARG_TYPES (TREE_TYPE (fn
));
238 basetype
= TREE_TYPE (TREE_VALUE (arg_types
));
239 arg_types
= TREE_CHAIN (arg_types
);
241 parms
= DECL_CHAIN (DECL_ARGUMENTS (fn
));
243 /* If this is a subobject constructor or destructor, our caller will
244 pass us a pointer to our VTT. */
245 if (CLASSTYPE_VBASECLASSES (DECL_CONTEXT (fn
)))
247 parm
= build_artificial_parm (vtt_parm_identifier
, vtt_parm_type
);
249 /* First add it to DECL_ARGUMENTS between 'this' and the real args... */
250 DECL_CHAIN (parm
) = parms
;
253 /* ...and then to TYPE_ARG_TYPES. */
254 arg_types
= hash_tree_chain (vtt_parm_type
, arg_types
);
256 DECL_HAS_VTT_PARM_P (fn
) = 1;
259 /* Then add the in-charge parm (before the VTT parm). */
260 parm
= build_artificial_parm (in_charge_identifier
, integer_type_node
);
261 DECL_CHAIN (parm
) = parms
;
263 arg_types
= hash_tree_chain (integer_type_node
, arg_types
);
265 /* Insert our new parameter(s) into the list. */
266 DECL_CHAIN (DECL_ARGUMENTS (fn
)) = parms
;
268 /* And rebuild the function type. */
269 fntype
= build_method_type_directly (basetype
, TREE_TYPE (TREE_TYPE (fn
)),
271 if (TYPE_RAISES_EXCEPTIONS (TREE_TYPE (fn
)))
272 fntype
= build_exception_variant (fntype
,
273 TYPE_RAISES_EXCEPTIONS (TREE_TYPE (fn
)));
274 if (TYPE_ATTRIBUTES (TREE_TYPE (fn
)))
275 fntype
= (cp_build_type_attribute_variant
276 (fntype
, TYPE_ATTRIBUTES (TREE_TYPE (fn
))));
277 TREE_TYPE (fn
) = fntype
;
279 /* Now we've got the in-charge parameter. */
280 DECL_HAS_IN_CHARGE_PARM_P (fn
) = 1;
283 /* Classes overload their constituent function names automatically.
284 When a function name is declared in a record structure,
285 its name is changed to it overloaded name. Since names for
286 constructors and destructors can conflict, we place a leading
289 CNAME is the name of the class we are grokking for.
291 FUNCTION is a FUNCTION_DECL. It was created by `grokdeclarator'.
293 FLAGS contains bits saying what's special about today's
294 arguments. DTOR_FLAG == DESTRUCTOR.
296 If FUNCTION is a destructor, then we must add the `auto-delete' field
297 as a second parameter. There is some hair associated with the fact
298 that we must "declare" this variable in the manner consistent with the
299 way the rest of the arguments were declared.
301 QUALS are the qualifiers for the this pointer. */
304 grokclassfn (tree ctype
, tree function
, enum overload_flags flags
)
306 tree fn_name
= DECL_NAME (function
);
308 /* Even within an `extern "C"' block, members get C++ linkage. See
309 [dcl.link] for details. */
310 SET_DECL_LANGUAGE (function
, lang_cplusplus
);
312 if (fn_name
== NULL_TREE
)
314 error ("name missing for member function");
315 fn_name
= get_identifier ("<anonymous>");
316 DECL_NAME (function
) = fn_name
;
319 DECL_CONTEXT (function
) = ctype
;
321 if (flags
== DTOR_FLAG
)
322 DECL_DESTRUCTOR_P (function
) = 1;
324 if (flags
== DTOR_FLAG
|| DECL_CONSTRUCTOR_P (function
))
325 maybe_retrofit_in_chrg (function
);
328 /* Create an ARRAY_REF, checking for the user doing things backwards
332 grok_array_decl (location_t loc
, tree array_expr
, tree index_exp
)
336 tree orig_array_expr
= array_expr
;
337 tree orig_index_exp
= index_exp
;
339 if (error_operand_p (array_expr
) || error_operand_p (index_exp
))
340 return error_mark_node
;
342 if (processing_template_decl
)
344 if (type_dependent_expression_p (array_expr
)
345 || type_dependent_expression_p (index_exp
))
346 return build_min_nt_loc (loc
, ARRAY_REF
, array_expr
, index_exp
,
347 NULL_TREE
, NULL_TREE
);
348 array_expr
= build_non_dependent_expr (array_expr
);
349 index_exp
= build_non_dependent_expr (index_exp
);
352 type
= TREE_TYPE (array_expr
);
354 type
= non_reference (type
);
356 /* If they have an `operator[]', use that. */
357 if (MAYBE_CLASS_TYPE_P (type
) || MAYBE_CLASS_TYPE_P (TREE_TYPE (index_exp
)))
358 expr
= build_new_op (loc
, ARRAY_REF
, LOOKUP_NORMAL
, array_expr
, index_exp
,
359 NULL_TREE
, /*overload=*/NULL
, tf_warning_or_error
);
364 /* Otherwise, create an ARRAY_REF for a pointer or array type.
365 It is a little-known fact that, if `a' is an array and `i' is
366 an int, you can write `i[a]', which means the same thing as
368 if (TREE_CODE (type
) == ARRAY_TYPE
|| TREE_CODE (type
) == VECTOR_TYPE
)
371 p1
= build_expr_type_conversion (WANT_POINTER
, array_expr
, false);
373 if (TREE_CODE (TREE_TYPE (index_exp
)) == ARRAY_TYPE
)
376 p2
= build_expr_type_conversion (WANT_POINTER
, index_exp
, false);
378 i1
= build_expr_type_conversion (WANT_INT
| WANT_ENUM
, array_expr
,
380 i2
= build_expr_type_conversion (WANT_INT
| WANT_ENUM
, index_exp
,
383 if ((p1
&& i2
) && (i1
&& p2
))
384 error ("ambiguous conversion for array subscript");
387 array_expr
= p1
, index_exp
= i2
;
389 array_expr
= p2
, index_exp
= i1
;
392 error ("invalid types %<%T[%T]%> for array subscript",
393 type
, TREE_TYPE (index_exp
));
394 return error_mark_node
;
397 if (array_expr
== error_mark_node
|| index_exp
== error_mark_node
)
398 error ("ambiguous conversion for array subscript");
400 expr
= build_array_ref (input_location
, array_expr
, index_exp
);
402 if (processing_template_decl
&& expr
!= error_mark_node
)
403 return build_min_non_dep (ARRAY_REF
, expr
, orig_array_expr
, orig_index_exp
,
404 NULL_TREE
, NULL_TREE
);
408 /* Given the cast expression EXP, checking out its validity. Either return
409 an error_mark_node if there was an unavoidable error, return a cast to
410 void for trying to delete a pointer w/ the value 0, or return the
411 call to delete. If DOING_VEC is true, we handle things differently
412 for doing an array delete.
413 Implements ARM $5.3.4. This is called from the parser. */
416 delete_sanity (tree exp
, tree size
, bool doing_vec
, int use_global_delete
,
417 tsubst_flags_t complain
)
421 if (exp
== error_mark_node
)
424 if (processing_template_decl
)
426 t
= build_min (DELETE_EXPR
, void_type_node
, exp
, size
);
427 DELETE_EXPR_USE_GLOBAL (t
) = use_global_delete
;
428 DELETE_EXPR_USE_VEC (t
) = doing_vec
;
429 TREE_SIDE_EFFECTS (t
) = 1;
433 /* An array can't have been allocated by new, so complain. */
434 if (TREE_CODE (TREE_TYPE (exp
)) == ARRAY_TYPE
)
435 warning (0, "deleting array %q#E", exp
);
437 t
= build_expr_type_conversion (WANT_POINTER
, exp
, true);
439 if (t
== NULL_TREE
|| t
== error_mark_node
)
441 error ("type %q#T argument given to %<delete%>, expected pointer",
443 return error_mark_node
;
446 type
= TREE_TYPE (t
);
448 /* As of Valley Forge, you can delete a pointer to const. */
450 /* You can't delete functions. */
451 if (TREE_CODE (TREE_TYPE (type
)) == FUNCTION_TYPE
)
453 error ("cannot delete a function. Only pointer-to-objects are "
454 "valid arguments to %<delete%>");
455 return error_mark_node
;
458 /* Deleting ptr to void is undefined behavior [expr.delete/3]. */
459 if (TREE_CODE (TREE_TYPE (type
)) == VOID_TYPE
)
461 warning (0, "deleting %qT is undefined", type
);
465 /* Deleting a pointer with the value zero is valid and has no effect. */
466 if (integer_zerop (t
))
467 return build1 (NOP_EXPR
, void_type_node
, t
);
470 return build_vec_delete (t
, /*maxindex=*/NULL_TREE
,
471 sfk_deleting_destructor
,
472 use_global_delete
, complain
);
474 return build_delete (type
, t
, sfk_deleting_destructor
,
475 LOOKUP_NORMAL
, use_global_delete
,
479 /* Report an error if the indicated template declaration is not the
480 sort of thing that should be a member template. */
483 check_member_template (tree tmpl
)
487 gcc_assert (TREE_CODE (tmpl
) == TEMPLATE_DECL
);
488 decl
= DECL_TEMPLATE_RESULT (tmpl
);
490 if (TREE_CODE (decl
) == FUNCTION_DECL
491 || DECL_ALIAS_TEMPLATE_P (tmpl
)
492 || (TREE_CODE (decl
) == TYPE_DECL
493 && MAYBE_CLASS_TYPE_P (TREE_TYPE (decl
))))
495 /* The parser rejects template declarations in local classes. */
496 gcc_assert (!current_function_decl
);
497 /* The parser rejects any use of virtual in a function template. */
498 gcc_assert (!(TREE_CODE (decl
) == FUNCTION_DECL
499 && DECL_VIRTUAL_P (decl
)));
501 /* The debug-information generating code doesn't know what to do
502 with member templates. */
503 DECL_IGNORED_P (tmpl
) = 1;
506 error ("template declaration of %q#D", decl
);
509 /* Return true iff TYPE is a valid Java parameter or return type. */
512 acceptable_java_type (tree type
)
514 if (type
== error_mark_node
)
517 if (TREE_CODE (type
) == VOID_TYPE
|| TYPE_FOR_JAVA (type
))
519 if (TREE_CODE (type
) == POINTER_TYPE
|| TREE_CODE (type
) == REFERENCE_TYPE
)
521 type
= TREE_TYPE (type
);
522 if (TREE_CODE (type
) == RECORD_TYPE
)
525 if (! TYPE_FOR_JAVA (type
))
527 if (! CLASSTYPE_TEMPLATE_INFO (type
))
529 args
= CLASSTYPE_TI_ARGS (type
);
530 i
= TREE_VEC_LENGTH (args
);
533 type
= TREE_VEC_ELT (args
, i
);
534 if (TREE_CODE (type
) == POINTER_TYPE
)
535 type
= TREE_TYPE (type
);
536 if (! TYPE_FOR_JAVA (type
))
545 /* For a METHOD in a Java class CTYPE, return true if
546 the parameter and return types are valid Java types.
547 Otherwise, print appropriate error messages, and return false. */
550 check_java_method (tree method
)
553 tree arg_types
= TYPE_ARG_TYPES (TREE_TYPE (method
));
554 tree ret_type
= TREE_TYPE (TREE_TYPE (method
));
556 if (!acceptable_java_type (ret_type
))
558 error ("Java method %qD has non-Java return type %qT",
563 arg_types
= TREE_CHAIN (arg_types
);
564 if (DECL_HAS_IN_CHARGE_PARM_P (method
))
565 arg_types
= TREE_CHAIN (arg_types
);
566 if (DECL_HAS_VTT_PARM_P (method
))
567 arg_types
= TREE_CHAIN (arg_types
);
569 for (; arg_types
!= NULL_TREE
; arg_types
= TREE_CHAIN (arg_types
))
571 tree type
= TREE_VALUE (arg_types
);
572 if (!acceptable_java_type (type
))
574 if (type
!= error_mark_node
)
575 error ("Java method %qD has non-Java parameter type %qT",
583 /* Sanity check: report error if this function FUNCTION is not
584 really a member of the class (CTYPE) it is supposed to belong to.
585 TEMPLATE_PARMS is used to specify the template parameters of a member
586 template passed as FUNCTION_DECL. If the member template is passed as a
587 TEMPLATE_DECL, it can be NULL since the parameters can be extracted
588 from the declaration. If the function is not a function template, it
590 It returns the original declaration for the function, NULL_TREE if
591 no declaration was found, error_mark_node if an error was emitted. */
594 check_classfn (tree ctype
, tree function
, tree template_parms
)
600 if (DECL_USE_TEMPLATE (function
)
601 && !(TREE_CODE (function
) == TEMPLATE_DECL
602 && DECL_TEMPLATE_SPECIALIZATION (function
))
603 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (function
)))
604 /* Since this is a specialization of a member template,
605 we're not going to find the declaration in the class.
608 struct S { template <typename T> void f(T); };
609 template <> void S::f(int);
611 we're not going to find `S::f(int)', but there's no
612 reason we should, either. We let our callers know we didn't
613 find the method, but we don't complain. */
616 /* Basic sanity check: for a template function, the template parameters
617 either were not passed, or they are the same of DECL_TEMPLATE_PARMS. */
618 if (TREE_CODE (function
) == TEMPLATE_DECL
)
621 && !comp_template_parms (template_parms
,
622 DECL_TEMPLATE_PARMS (function
)))
624 error ("template parameter lists provided don%'t match the "
625 "template parameters of %qD", function
);
626 return error_mark_node
;
628 template_parms
= DECL_TEMPLATE_PARMS (function
);
631 /* OK, is this a definition of a member template? */
632 is_template
= (template_parms
!= NULL_TREE
);
634 /* We must enter the scope here, because conversion operators are
635 named by target type, and type equivalence relies on typenames
636 resolving within the scope of CTYPE. */
637 pushed_scope
= push_scope (ctype
);
638 ix
= class_method_index_for_fn (complete_type (ctype
), function
);
641 vec
<tree
, va_gc
> *methods
= CLASSTYPE_METHOD_VEC (ctype
);
642 tree fndecls
, fndecl
= 0;
644 const char *format
= NULL
;
646 for (fndecls
= (*methods
)[ix
];
647 fndecls
; fndecls
= OVL_NEXT (fndecls
))
651 fndecl
= OVL_CURRENT (fndecls
);
652 p1
= TYPE_ARG_TYPES (TREE_TYPE (function
));
653 p2
= TYPE_ARG_TYPES (TREE_TYPE (fndecl
));
655 /* We cannot simply call decls_match because this doesn't
656 work for static member functions that are pretending to
657 be methods, and because the name may have been changed by
660 /* Get rid of the this parameter on functions that become
662 if (DECL_STATIC_FUNCTION_P (fndecl
)
663 && TREE_CODE (TREE_TYPE (function
)) == METHOD_TYPE
)
664 p1
= TREE_CHAIN (p1
);
666 /* A member template definition only matches a member template
668 if (is_template
!= (TREE_CODE (fndecl
) == TEMPLATE_DECL
))
671 /* While finding a match, same types and params are not enough
672 if the function is versioned. Also check version ("target")
674 if (same_type_p (TREE_TYPE (TREE_TYPE (function
)),
675 TREE_TYPE (TREE_TYPE (fndecl
)))
676 && compparms (p1
, p2
)
677 && !targetm
.target_option
.function_versions (function
, fndecl
)
679 || comp_template_parms (template_parms
,
680 DECL_TEMPLATE_PARMS (fndecl
)))
681 && (DECL_TEMPLATE_SPECIALIZATION (function
)
682 == DECL_TEMPLATE_SPECIALIZATION (fndecl
))
683 && (!DECL_TEMPLATE_SPECIALIZATION (function
)
684 || (DECL_TI_TEMPLATE (function
)
685 == DECL_TI_TEMPLATE (fndecl
))))
691 pop_scope (pushed_scope
);
692 return OVL_CURRENT (fndecls
);
695 error_at (DECL_SOURCE_LOCATION (function
),
696 "prototype for %q#D does not match any in class %qT",
698 is_conv_op
= DECL_CONV_FN_P (fndecl
);
701 ix
= CLASSTYPE_FIRST_CONVERSION_SLOT
;
702 fndecls
= (*methods
)[ix
];
705 fndecl
= OVL_CURRENT (fndecls
);
706 fndecls
= OVL_NEXT (fndecls
);
708 if (!fndecls
&& is_conv_op
)
710 if (methods
->length () > (size_t) ++ix
)
712 fndecls
= (*methods
)[ix
];
713 if (!DECL_CONV_FN_P (OVL_CURRENT (fndecls
)))
725 format
= N_("candidates are: %+#D");
727 format
= N_("candidate is: %+#D");
728 error (format
, fndecl
);
731 else if (!COMPLETE_TYPE_P (ctype
))
732 cxx_incomplete_type_error (function
, ctype
);
734 error ("no %q#D member function declared in class %qT",
738 pop_scope (pushed_scope
);
739 return error_mark_node
;
742 /* DECL is a function with vague linkage. Remember it so that at the
743 end of the translation unit we can decide whether or not to emit
747 note_vague_linkage_fn (tree decl
)
749 DECL_DEFER_OUTPUT (decl
) = 1;
750 vec_safe_push (deferred_fns
, decl
);
753 /* We have just processed the DECL, which is a static data member.
754 The other parameters are as for cp_finish_decl. */
757 finish_static_data_member_decl (tree decl
,
758 tree init
, bool init_const_expr_p
,
762 DECL_CONTEXT (decl
) = current_class_type
;
764 /* We cannot call pushdecl here, because that would fill in the
765 TREE_CHAIN of our decl. Instead, we modify cp_finish_decl to do
766 the right thing, namely, to put this decl out straight away. */
768 if (! processing_template_decl
)
769 vec_safe_push (pending_statics
, decl
);
771 if (LOCAL_CLASS_P (current_class_type
)
772 /* We already complained about the template definition. */
773 && !DECL_TEMPLATE_INSTANTIATION (decl
))
774 permerror (input_location
, "local class %q#T shall not have static data member %q#D",
775 current_class_type
, decl
);
777 DECL_IN_AGGR_P (decl
) = 1;
779 if (TREE_CODE (TREE_TYPE (decl
)) == ARRAY_TYPE
780 && TYPE_DOMAIN (TREE_TYPE (decl
)) == NULL_TREE
)
781 SET_VAR_HAD_UNKNOWN_BOUND (decl
);
783 cp_finish_decl (decl
, init
, init_const_expr_p
, asmspec_tree
, flags
);
786 /* DECLARATOR and DECLSPECS correspond to a class member. The other
787 parameters are as for cp_finish_decl. Return the DECL for the
788 class member declared. */
791 grokfield (const cp_declarator
*declarator
,
792 cp_decl_specifier_seq
*declspecs
,
793 tree init
, bool init_const_expr_p
,
798 const char *asmspec
= 0;
803 && TREE_CODE (init
) == TREE_LIST
804 && TREE_VALUE (init
) == error_mark_node
805 && TREE_CHAIN (init
) == NULL_TREE
)
808 value
= grokdeclarator (declarator
, declspecs
, FIELD
, init
!= 0, &attrlist
);
809 if (! value
|| error_operand_p (value
))
810 /* friend or constructor went bad. */
811 return error_mark_node
;
813 if (TREE_CODE (value
) == TYPE_DECL
&& init
)
815 error ("typedef %qD is initialized (use decltype instead)", value
);
819 /* Pass friendly classes back. */
820 if (value
== void_type_node
)
823 /* Pass friend decls back. */
824 if ((TREE_CODE (value
) == FUNCTION_DECL
825 || TREE_CODE (value
) == TEMPLATE_DECL
)
826 && DECL_CONTEXT (value
) != current_class_type
)
829 name
= DECL_NAME (value
);
831 if (name
!= NULL_TREE
)
833 if (TREE_CODE (name
) == TEMPLATE_ID_EXPR
)
835 error ("explicit template argument list not allowed");
836 return error_mark_node
;
839 if (IDENTIFIER_POINTER (name
)[0] == '_'
840 && ! strcmp (IDENTIFIER_POINTER (name
), "_vptr"))
841 error ("member %qD conflicts with virtual function table field name",
845 /* Stash away type declarations. */
846 if (TREE_CODE (value
) == TYPE_DECL
)
848 DECL_NONLOCAL (value
) = 1;
849 DECL_CONTEXT (value
) = current_class_type
;
855 /* If this is a typedef that names the class for linkage purposes
856 (7.1.3p8), apply any attributes directly to the type. */
857 if (TAGGED_TYPE_P (TREE_TYPE (value
))
858 && value
== TYPE_NAME (TYPE_MAIN_VARIANT (TREE_TYPE (value
))))
859 attrflags
= ATTR_FLAG_TYPE_IN_PLACE
;
861 cplus_decl_attributes (&value
, attrlist
, attrflags
);
864 if (decl_spec_seq_has_spec_p (declspecs
, ds_typedef
)
865 && TREE_TYPE (value
) != error_mark_node
866 && TYPE_NAME (TYPE_MAIN_VARIANT (TREE_TYPE (value
))) != value
)
867 set_underlying_type (value
);
869 /* It's important that push_template_decl below follows
870 set_underlying_type above so that the created template
871 carries the properly set type of VALUE. */
872 if (processing_template_decl
)
873 value
= push_template_decl (value
);
875 record_locally_defined_typedef (value
);
879 if (DECL_IN_AGGR_P (value
))
881 error ("%qD is already defined in %qT", value
, DECL_CONTEXT (value
));
882 return void_type_node
;
885 if (asmspec_tree
&& asmspec_tree
!= error_mark_node
)
886 asmspec
= TREE_STRING_POINTER (asmspec_tree
);
890 if (TREE_CODE (value
) == FUNCTION_DECL
)
892 /* Initializers for functions are rejected early in the parser.
893 If we get here, it must be a pure specifier for a method. */
894 if (init
== ridpointers
[(int)RID_DELETE
])
896 DECL_DELETED_FN (value
) = 1;
897 DECL_DECLARED_INLINE_P (value
) = 1;
898 DECL_INITIAL (value
) = error_mark_node
;
900 else if (init
== ridpointers
[(int)RID_DEFAULT
])
902 if (defaultable_fn_check (value
))
904 DECL_DEFAULTED_FN (value
) = 1;
905 DECL_INITIALIZED_IN_CLASS_P (value
) = 1;
906 DECL_DECLARED_INLINE_P (value
) = 1;
909 else if (TREE_CODE (init
) == DEFAULT_ARG
)
910 error ("invalid initializer for member function %qD", value
);
911 else if (TREE_CODE (TREE_TYPE (value
)) == METHOD_TYPE
)
913 if (integer_zerop (init
))
914 DECL_PURE_VIRTUAL_P (value
) = 1;
915 else if (error_operand_p (init
))
916 ; /* An error has already been reported. */
918 error ("invalid initializer for member function %qD",
923 gcc_assert (TREE_CODE (TREE_TYPE (value
)) == FUNCTION_TYPE
);
924 error ("initializer specified for static member function %qD",
928 else if (TREE_CODE (value
) == FIELD_DECL
)
929 /* C++11 NSDMI, keep going. */;
930 else if (TREE_CODE (value
) != VAR_DECL
)
932 else if (!processing_template_decl
)
934 if (TREE_CODE (init
) == CONSTRUCTOR
)
935 init
= digest_init (TREE_TYPE (value
), init
, tf_warning_or_error
);
936 init
= maybe_constant_init (init
);
938 if (init
!= error_mark_node
&& !TREE_CONSTANT (init
))
940 /* We can allow references to things that are effectively
941 static, since references are initialized with the
943 if (TREE_CODE (TREE_TYPE (value
)) != REFERENCE_TYPE
944 || (TREE_STATIC (init
) == 0
945 && (!DECL_P (init
) || DECL_EXTERNAL (init
) == 0)))
947 error ("field initializer is not constant");
948 init
= error_mark_node
;
954 if (processing_template_decl
955 && (TREE_CODE (value
) == VAR_DECL
|| TREE_CODE (value
) == FUNCTION_DECL
))
957 value
= push_template_decl (value
);
958 if (error_operand_p (value
))
959 return error_mark_node
;
963 cplus_decl_attributes (&value
, attrlist
, 0);
965 if (init
&& BRACE_ENCLOSED_INITIALIZER_P (init
)
966 && CONSTRUCTOR_IS_DIRECT_INIT (init
))
967 flags
= LOOKUP_NORMAL
;
969 flags
= LOOKUP_IMPLICIT
;
971 switch (TREE_CODE (value
))
974 finish_static_data_member_decl (value
, init
, init_const_expr_p
,
975 asmspec_tree
, flags
);
980 error ("%<asm%> specifiers are not permitted on non-static data members");
981 if (DECL_INITIAL (value
) == error_mark_node
)
982 init
= error_mark_node
;
983 cp_finish_decl (value
, init
, /*init_const_expr_p=*/false,
985 DECL_IN_AGGR_P (value
) = 1;
990 set_user_assembler_name (value
, asmspec
);
992 cp_finish_decl (value
,
994 /*init_const_expr_p=*/false,
995 asmspec_tree
, flags
);
997 /* Pass friends back this way. */
998 if (DECL_FRIEND_P (value
))
999 return void_type_node
;
1001 DECL_IN_AGGR_P (value
) = 1;
1010 /* Like `grokfield', but for bitfields.
1011 WIDTH is non-NULL for bit fields only, and is an INTEGER_CST node. */
1014 grokbitfield (const cp_declarator
*declarator
,
1015 cp_decl_specifier_seq
*declspecs
, tree width
,
1018 tree value
= grokdeclarator (declarator
, declspecs
, BITFIELD
, 0, &attrlist
);
1020 if (value
== error_mark_node
)
1021 return NULL_TREE
; /* friends went bad. */
1023 /* Pass friendly classes back. */
1024 if (TREE_CODE (value
) == VOID_TYPE
)
1025 return void_type_node
;
1027 if (!INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (TREE_TYPE (value
))
1028 && (POINTER_TYPE_P (value
)
1029 || !dependent_type_p (TREE_TYPE (value
))))
1031 error ("bit-field %qD with non-integral type", value
);
1032 return error_mark_node
;
1035 if (TREE_CODE (value
) == TYPE_DECL
)
1037 error ("cannot declare %qD to be a bit-field type", value
);
1041 /* Usually, finish_struct_1 catches bitfields with invalid types.
1042 But, in the case of bitfields with function type, we confuse
1043 ourselves into thinking they are member functions, so we must
1045 if (TREE_CODE (value
) == FUNCTION_DECL
)
1047 error ("cannot declare bit-field %qD with function type",
1052 if (DECL_IN_AGGR_P (value
))
1054 error ("%qD is already defined in the class %qT", value
,
1055 DECL_CONTEXT (value
));
1056 return void_type_node
;
1059 if (TREE_STATIC (value
))
1061 error ("static member %qD cannot be a bit-field", value
);
1064 cp_finish_decl (value
, NULL_TREE
, false, NULL_TREE
, 0);
1066 if (width
!= error_mark_node
)
1068 /* The width must be an integer type. */
1069 if (!type_dependent_expression_p (width
)
1070 && !INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (TREE_TYPE (width
)))
1071 error ("width of bit-field %qD has non-integral type %qT", value
,
1073 DECL_INITIAL (value
) = width
;
1074 SET_DECL_C_BIT_FIELD (value
);
1077 DECL_IN_AGGR_P (value
) = 1;
1080 cplus_decl_attributes (&value
, attrlist
, /*flags=*/0);
1086 /* Returns true iff ATTR is an attribute which needs to be applied at
1087 instantiation time rather than template definition time. */
1090 is_late_template_attribute (tree attr
, tree decl
)
1092 tree name
= get_attribute_name (attr
);
1093 tree args
= TREE_VALUE (attr
);
1094 const struct attribute_spec
*spec
= lookup_attribute_spec (name
);
1098 /* Unknown attribute. */
1101 /* Attribute weak handling wants to write out assembly right away. */
1102 if (is_attribute_p ("weak", name
))
1105 /* Attribute unused is applied directly, as it appertains to
1107 if (is_attribute_p ("unused", name
))
1110 /* If any of the arguments are dependent expressions, we can't evaluate
1111 the attribute until instantiation time. */
1112 for (arg
= args
; arg
; arg
= TREE_CHAIN (arg
))
1114 tree t
= TREE_VALUE (arg
);
1116 /* If the first attribute argument is an identifier, only consider
1117 second and following arguments. Attributes like mode, format,
1118 cleanup and several target specific attributes aren't late
1119 just because they have an IDENTIFIER_NODE as first argument. */
1120 if (arg
== args
&& TREE_CODE (t
) == IDENTIFIER_NODE
)
1123 if (value_dependent_expression_p (t
)
1124 || type_dependent_expression_p (t
))
1128 if (TREE_CODE (decl
) == TYPE_DECL
1130 || spec
->type_required
)
1132 tree type
= TYPE_P (decl
) ? decl
: TREE_TYPE (decl
);
1134 /* We can't apply any attributes to a completely unknown type until
1135 instantiation time. */
1136 enum tree_code code
= TREE_CODE (type
);
1137 if (code
== TEMPLATE_TYPE_PARM
1138 || code
== BOUND_TEMPLATE_TEMPLATE_PARM
1139 || code
== TYPENAME_TYPE
)
1141 /* Also defer most attributes on dependent types. This is not
1142 necessary in all cases, but is the better default. */
1143 else if (dependent_type_p (type
)
1144 /* But attribute visibility specifically works on
1146 && !is_attribute_p ("visibility", name
))
1155 /* ATTR_P is a list of attributes. Remove any attributes which need to be
1156 applied at instantiation time and return them. If IS_DEPENDENT is true,
1157 the declaration itself is dependent, so all attributes should be applied
1158 at instantiation time. */
1161 splice_template_attributes (tree
*attr_p
, tree decl
)
1164 tree late_attrs
= NULL_TREE
;
1165 tree
*q
= &late_attrs
;
1172 if (is_late_template_attribute (*p
, decl
))
1174 ATTR_IS_DEPENDENT (*p
) = 1;
1176 *p
= TREE_CHAIN (*p
);
1177 q
= &TREE_CHAIN (*q
);
1181 p
= &TREE_CHAIN (*p
);
1187 /* Remove any late attributes from the list in ATTR_P and attach them to
1191 save_template_attributes (tree
*attr_p
, tree
*decl_p
)
1193 tree late_attrs
= splice_template_attributes (attr_p
, *decl_p
);
1195 tree old_attrs
= NULL_TREE
;
1200 if (DECL_P (*decl_p
))
1201 q
= &DECL_ATTRIBUTES (*decl_p
);
1203 q
= &TYPE_ATTRIBUTES (*decl_p
);
1207 /* Merge the late attributes at the beginning with the attribute
1209 late_attrs
= merge_attributes (late_attrs
, *q
);
1212 if (!DECL_P (*decl_p
) && *decl_p
== TYPE_MAIN_VARIANT (*decl_p
))
1214 /* We've added new attributes directly to the main variant, so
1215 now we need to update all of the other variants to include
1216 these new attributes. */
1218 for (variant
= TYPE_NEXT_VARIANT (*decl_p
); variant
;
1219 variant
= TYPE_NEXT_VARIANT (variant
))
1221 gcc_assert (TYPE_ATTRIBUTES (variant
) == old_attrs
);
1222 TYPE_ATTRIBUTES (variant
) = TYPE_ATTRIBUTES (*decl_p
);
1227 /* Like reconstruct_complex_type, but handle also template trees. */
1230 cp_reconstruct_complex_type (tree type
, tree bottom
)
1234 if (TREE_CODE (type
) == POINTER_TYPE
)
1236 inner
= cp_reconstruct_complex_type (TREE_TYPE (type
), bottom
);
1237 outer
= build_pointer_type_for_mode (inner
, TYPE_MODE (type
),
1238 TYPE_REF_CAN_ALIAS_ALL (type
));
1240 else if (TREE_CODE (type
) == REFERENCE_TYPE
)
1242 inner
= cp_reconstruct_complex_type (TREE_TYPE (type
), bottom
);
1243 outer
= build_reference_type_for_mode (inner
, TYPE_MODE (type
),
1244 TYPE_REF_CAN_ALIAS_ALL (type
));
1246 else if (TREE_CODE (type
) == ARRAY_TYPE
)
1248 inner
= cp_reconstruct_complex_type (TREE_TYPE (type
), bottom
);
1249 outer
= build_cplus_array_type (inner
, TYPE_DOMAIN (type
));
1250 /* Don't call cp_build_qualified_type on ARRAY_TYPEs, the
1251 element type qualification will be handled by the recursive
1252 cp_reconstruct_complex_type call and cp_build_qualified_type
1253 for ARRAY_TYPEs changes the element type. */
1256 else if (TREE_CODE (type
) == FUNCTION_TYPE
)
1258 inner
= cp_reconstruct_complex_type (TREE_TYPE (type
), bottom
);
1259 outer
= build_function_type (inner
, TYPE_ARG_TYPES (type
));
1260 outer
= apply_memfn_quals (outer
, type_memfn_quals (type
));
1262 else if (TREE_CODE (type
) == METHOD_TYPE
)
1264 inner
= cp_reconstruct_complex_type (TREE_TYPE (type
), bottom
);
1265 /* The build_method_type_directly() routine prepends 'this' to argument list,
1266 so we must compensate by getting rid of it. */
1268 = build_method_type_directly
1269 (class_of_this_parm (type
), inner
,
1270 TREE_CHAIN (TYPE_ARG_TYPES (type
)));
1272 else if (TREE_CODE (type
) == OFFSET_TYPE
)
1274 inner
= cp_reconstruct_complex_type (TREE_TYPE (type
), bottom
);
1275 outer
= build_offset_type (TYPE_OFFSET_BASETYPE (type
), inner
);
1280 if (TYPE_ATTRIBUTES (type
))
1281 outer
= cp_build_type_attribute_variant (outer
, TYPE_ATTRIBUTES (type
));
1282 return cp_build_qualified_type (outer
, cp_type_quals (type
));
1285 /* Replaces any constexpr expression that may be into the attributes
1286 arguments with their reduced value. */
1289 cp_check_const_attributes (tree attributes
)
1292 for (attr
= attributes
; attr
; attr
= TREE_CHAIN (attr
))
1295 for (arg
= TREE_VALUE (attr
); arg
; arg
= TREE_CHAIN (arg
))
1297 tree expr
= TREE_VALUE (arg
);
1299 TREE_VALUE (arg
) = maybe_constant_value (expr
);
1304 /* Like decl_attributes, but handle C++ complexity. */
1307 cplus_decl_attributes (tree
*decl
, tree attributes
, int flags
)
1309 if (*decl
== NULL_TREE
|| *decl
== void_type_node
1310 || *decl
== error_mark_node
)
1313 if (processing_template_decl
)
1315 if (check_for_bare_parameter_packs (attributes
))
1318 save_template_attributes (&attributes
, decl
);
1321 cp_check_const_attributes (attributes
);
1323 if (TREE_CODE (*decl
) == TEMPLATE_DECL
)
1324 decl
= &DECL_TEMPLATE_RESULT (*decl
);
1326 decl_attributes (decl
, attributes
, flags
);
1328 if (TREE_CODE (*decl
) == TYPE_DECL
)
1329 SET_IDENTIFIER_TYPE_VALUE (DECL_NAME (*decl
), TREE_TYPE (*decl
));
1332 /* Walks through the namespace- or function-scope anonymous union
1333 OBJECT, with the indicated TYPE, building appropriate VAR_DECLs.
1334 Returns one of the fields for use in the mangled name. */
1337 build_anon_union_vars (tree type
, tree object
)
1339 tree main_decl
= NULL_TREE
;
1342 /* Rather than write the code to handle the non-union case,
1343 just give an error. */
1344 if (TREE_CODE (type
) != UNION_TYPE
)
1346 error ("anonymous struct not inside named type");
1347 return error_mark_node
;
1350 for (field
= TYPE_FIELDS (type
);
1352 field
= DECL_CHAIN (field
))
1357 if (DECL_ARTIFICIAL (field
))
1359 if (TREE_CODE (field
) != FIELD_DECL
)
1361 permerror (input_location
, "%q+#D invalid; an anonymous union can only "
1362 "have non-static data members", field
);
1366 if (TREE_PRIVATE (field
))
1367 permerror (input_location
, "private member %q+#D in anonymous union", field
);
1368 else if (TREE_PROTECTED (field
))
1369 permerror (input_location
, "protected member %q+#D in anonymous union", field
);
1371 if (processing_template_decl
)
1372 ref
= build_min_nt_loc (UNKNOWN_LOCATION
, COMPONENT_REF
, object
,
1373 DECL_NAME (field
), NULL_TREE
);
1375 ref
= build_class_member_access_expr (object
, field
, NULL_TREE
,
1376 false, tf_warning_or_error
);
1378 if (DECL_NAME (field
))
1382 decl
= build_decl (input_location
,
1383 VAR_DECL
, DECL_NAME (field
), TREE_TYPE (field
));
1384 DECL_ANON_UNION_VAR_P (decl
) = 1;
1385 DECL_ARTIFICIAL (decl
) = 1;
1387 base
= get_base_address (object
);
1388 TREE_PUBLIC (decl
) = TREE_PUBLIC (base
);
1389 TREE_STATIC (decl
) = TREE_STATIC (base
);
1390 DECL_EXTERNAL (decl
) = DECL_EXTERNAL (base
);
1392 SET_DECL_VALUE_EXPR (decl
, ref
);
1393 DECL_HAS_VALUE_EXPR_P (decl
) = 1;
1395 decl
= pushdecl (decl
);
1397 else if (ANON_AGGR_TYPE_P (TREE_TYPE (field
)))
1398 decl
= build_anon_union_vars (TREE_TYPE (field
), ref
);
1402 if (main_decl
== NULL_TREE
)
1409 /* Finish off the processing of a UNION_TYPE structure. If the union is an
1410 anonymous union, then all members must be laid out together. PUBLIC_P
1411 is nonzero if this union is not declared static. */
1414 finish_anon_union (tree anon_union_decl
)
1420 if (anon_union_decl
== error_mark_node
)
1423 type
= TREE_TYPE (anon_union_decl
);
1424 public_p
= TREE_PUBLIC (anon_union_decl
);
1426 /* The VAR_DECL's context is the same as the TYPE's context. */
1427 DECL_CONTEXT (anon_union_decl
) = DECL_CONTEXT (TYPE_NAME (type
));
1429 if (TYPE_FIELDS (type
) == NULL_TREE
)
1434 error ("namespace-scope anonymous aggregates must be static");
1438 main_decl
= build_anon_union_vars (type
, anon_union_decl
);
1439 if (main_decl
== error_mark_node
)
1441 if (main_decl
== NULL_TREE
)
1443 warning (0, "anonymous union with no members");
1447 if (!processing_template_decl
)
1449 /* Use main_decl to set the mangled name. */
1450 DECL_NAME (anon_union_decl
) = DECL_NAME (main_decl
);
1451 maybe_commonize_var (anon_union_decl
);
1452 if (TREE_STATIC (anon_union_decl
) || DECL_EXTERNAL (anon_union_decl
))
1453 mangle_decl (anon_union_decl
);
1454 DECL_NAME (anon_union_decl
) = NULL_TREE
;
1457 pushdecl (anon_union_decl
);
1458 cp_finish_decl (anon_union_decl
, NULL_TREE
, false, NULL_TREE
, 0);
1461 /* Auxiliary functions to make type signatures for
1462 `operator new' and `operator delete' correspond to
1463 what compiler will be expecting. */
1466 coerce_new_type (tree type
)
1469 tree args
= TYPE_ARG_TYPES (type
);
1471 gcc_assert (TREE_CODE (type
) == FUNCTION_TYPE
);
1473 if (!same_type_p (TREE_TYPE (type
), ptr_type_node
))
1476 error ("%<operator new%> must return type %qT", ptr_type_node
);
1479 if (args
&& args
!= void_list_node
)
1481 if (TREE_PURPOSE (args
))
1483 /* [basic.stc.dynamic.allocation]
1485 The first parameter shall not have an associated default
1487 error ("the first parameter of %<operator new%> cannot "
1488 "have a default argument");
1489 /* Throw away the default argument. */
1490 TREE_PURPOSE (args
) = NULL_TREE
;
1493 if (!same_type_p (TREE_VALUE (args
), size_type_node
))
1496 args
= TREE_CHAIN (args
);
1503 permerror (input_location
, "%<operator new%> takes type %<size_t%> (%qT) "
1504 "as first parameter", size_type_node
);
1509 args
= tree_cons (NULL_TREE
, size_type_node
, args
);
1512 type
= build_exception_variant
1513 (build_function_type (ptr_type_node
, args
),
1514 TYPE_RAISES_EXCEPTIONS (type
));
1522 coerce_delete_type (tree type
)
1525 tree args
= TYPE_ARG_TYPES (type
);
1527 gcc_assert (TREE_CODE (type
) == FUNCTION_TYPE
);
1529 if (!same_type_p (TREE_TYPE (type
), void_type_node
))
1532 error ("%<operator delete%> must return type %qT", void_type_node
);
1535 if (!args
|| args
== void_list_node
1536 || !same_type_p (TREE_VALUE (args
), ptr_type_node
))
1539 if (args
&& args
!= void_list_node
)
1540 args
= TREE_CHAIN (args
);
1541 error ("%<operator delete%> takes type %qT as first parameter",
1547 args
= tree_cons (NULL_TREE
, ptr_type_node
, args
);
1550 type
= build_exception_variant
1551 (build_function_type (void_type_node
, args
),
1552 TYPE_RAISES_EXCEPTIONS (type
));
1560 /* DECL is a VAR_DECL for a vtable: walk through the entries in the vtable
1561 and mark them as needed. */
1564 mark_vtable_entries (tree decl
)
1567 unsigned HOST_WIDE_INT idx
;
1569 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (DECL_INITIAL (decl
)),
1574 STRIP_NOPS (fnaddr
);
1576 if (TREE_CODE (fnaddr
) != ADDR_EXPR
1577 && TREE_CODE (fnaddr
) != FDESC_EXPR
)
1578 /* This entry is an offset: a virtual base class offset, a
1579 virtual call offset, an RTTI offset, etc. */
1582 fn
= TREE_OPERAND (fnaddr
, 0);
1583 TREE_ADDRESSABLE (fn
) = 1;
1584 /* When we don't have vcall offsets, we output thunks whenever
1585 we output the vtables that contain them. With vcall offsets,
1586 we know all the thunks we'll need when we emit a virtual
1587 function, so we emit the thunks there instead. */
1588 if (DECL_THUNK_P (fn
))
1589 use_thunk (fn
, /*emit_p=*/0);
1594 /* Set DECL up to have the closest approximation of "initialized common"
1595 linkage available. */
1598 comdat_linkage (tree decl
)
1601 make_decl_one_only (decl
, cxx_comdat_group (decl
));
1602 else if (TREE_CODE (decl
) == FUNCTION_DECL
1603 || (TREE_CODE (decl
) == VAR_DECL
&& DECL_ARTIFICIAL (decl
)))
1604 /* We can just emit function and compiler-generated variables
1605 statically; having multiple copies is (for the most part) only
1608 There are two correctness issues, however: the address of a
1609 template instantiation with external linkage should be the
1610 same, independent of what translation unit asks for the
1611 address, and this will not hold when we emit multiple copies of
1612 the function. However, there's little else we can do.
1614 Also, by default, the typeinfo implementation assumes that
1615 there will be only one copy of the string used as the name for
1616 each type. Therefore, if weak symbols are unavailable, the
1617 run-time library should perform a more conservative check; it
1618 should perform a string comparison, rather than an address
1620 TREE_PUBLIC (decl
) = 0;
1623 /* Static data member template instantiations, however, cannot
1624 have multiple copies. */
1625 if (DECL_INITIAL (decl
) == 0
1626 || DECL_INITIAL (decl
) == error_mark_node
)
1627 DECL_COMMON (decl
) = 1;
1628 else if (EMPTY_CONSTRUCTOR_P (DECL_INITIAL (decl
)))
1630 DECL_COMMON (decl
) = 1;
1631 DECL_INITIAL (decl
) = error_mark_node
;
1633 else if (!DECL_EXPLICIT_INSTANTIATION (decl
))
1635 /* We can't do anything useful; leave vars for explicit
1637 DECL_EXTERNAL (decl
) = 1;
1638 DECL_NOT_REALLY_EXTERN (decl
) = 0;
1642 DECL_COMDAT (decl
) = 1;
1645 /* For win32 we also want to put explicit instantiations in
1646 linkonce sections, so that they will be merged with implicit
1647 instantiations; otherwise we get duplicate symbol errors.
1648 For Darwin we do not want explicit instantiations to be
1652 maybe_make_one_only (tree decl
)
1654 /* We used to say that this was not necessary on targets that support weak
1655 symbols, because the implicit instantiations will defer to the explicit
1656 one. However, that's not actually the case in SVR4; a strong definition
1657 after a weak one is an error. Also, not making explicit
1658 instantiations one_only means that we can end up with two copies of
1659 some template instantiations. */
1663 /* We can't set DECL_COMDAT on functions, or cp_finish_file will think
1664 we can get away with not emitting them if they aren't used. We need
1665 to for variables so that cp_finish_decl will update their linkage,
1666 because their DECL_INITIAL may not have been set properly yet. */
1668 if (!TARGET_WEAK_NOT_IN_ARCHIVE_TOC
1669 || (! DECL_EXPLICIT_INSTANTIATION (decl
)
1670 && ! DECL_TEMPLATE_SPECIALIZATION (decl
)))
1672 make_decl_one_only (decl
, cxx_comdat_group (decl
));
1674 if (TREE_CODE (decl
) == VAR_DECL
)
1676 DECL_COMDAT (decl
) = 1;
1677 /* Mark it needed so we don't forget to emit it. */
1678 mark_decl_referenced (decl
);
1679 TREE_USED (decl
) = 1;
1684 /* Returns true iff DECL, a FUNCTION_DECL or VAR_DECL, has vague linkage.
1685 This predicate will give the right answer during parsing of the
1686 function, which other tests may not. */
1689 vague_linkage_p (tree decl
)
1691 /* Unfortunately, import_export_decl has not always been called
1692 before the function is processed, so we cannot simply check
1694 return (DECL_COMDAT (decl
)
1695 || (((TREE_CODE (decl
) == FUNCTION_DECL
1696 && DECL_DECLARED_INLINE_P (decl
))
1697 || (DECL_LANG_SPECIFIC (decl
)
1698 && DECL_TEMPLATE_INSTANTIATION (decl
)))
1699 && TREE_PUBLIC (decl
)));
1702 /* Determine whether or not we want to specifically import or export CTYPE,
1703 using various heuristics. */
1706 import_export_class (tree ctype
)
1708 /* -1 for imported, 1 for exported. */
1709 int import_export
= 0;
1711 /* It only makes sense to call this function at EOF. The reason is
1712 that this function looks at whether or not the first non-inline
1713 non-abstract virtual member function has been defined in this
1714 translation unit. But, we can't possibly know that until we've
1715 seen the entire translation unit. */
1716 gcc_assert (at_eof
);
1718 if (CLASSTYPE_INTERFACE_KNOWN (ctype
))
1721 /* If MULTIPLE_SYMBOL_SPACES is set and we saw a #pragma interface,
1722 we will have CLASSTYPE_INTERFACE_ONLY set but not
1723 CLASSTYPE_INTERFACE_KNOWN. In that case, we don't want to use this
1724 heuristic because someone will supply a #pragma implementation
1725 elsewhere, and deducing it here would produce a conflict. */
1726 if (CLASSTYPE_INTERFACE_ONLY (ctype
))
1729 if (lookup_attribute ("dllimport", TYPE_ATTRIBUTES (ctype
)))
1731 else if (lookup_attribute ("dllexport", TYPE_ATTRIBUTES (ctype
)))
1733 else if (CLASSTYPE_IMPLICIT_INSTANTIATION (ctype
)
1734 && !flag_implicit_templates
)
1735 /* For a template class, without -fimplicit-templates, check the
1736 repository. If the virtual table is assigned to this
1737 translation unit, then export the class; otherwise, import
1739 import_export
= repo_export_class_p (ctype
) ? 1 : -1;
1740 else if (TYPE_POLYMORPHIC_P (ctype
))
1742 /* The ABI specifies that the virtual table and associated
1743 information are emitted with the key method, if any. */
1744 tree method
= CLASSTYPE_KEY_METHOD (ctype
);
1745 /* If weak symbol support is not available, then we must be
1746 careful not to emit the vtable when the key function is
1747 inline. An inline function can be defined in multiple
1748 translation units. If we were to emit the vtable in each
1749 translation unit containing a definition, we would get
1750 multiple definition errors at link-time. */
1751 if (method
&& (flag_weak
|| ! DECL_DECLARED_INLINE_P (method
)))
1752 import_export
= (DECL_REALLY_EXTERN (method
) ? -1 : 1);
1755 /* When MULTIPLE_SYMBOL_SPACES is set, we cannot count on seeing
1756 a definition anywhere else. */
1757 if (MULTIPLE_SYMBOL_SPACES
&& import_export
== -1)
1760 /* Allow back ends the chance to overrule the decision. */
1761 if (targetm
.cxx
.import_export_class
)
1762 import_export
= targetm
.cxx
.import_export_class (ctype
, import_export
);
1766 SET_CLASSTYPE_INTERFACE_KNOWN (ctype
);
1767 CLASSTYPE_INTERFACE_ONLY (ctype
) = (import_export
< 0);
1771 /* Return true if VAR has already been provided to the back end; in that
1772 case VAR should not be modified further by the front end. */
1774 var_finalized_p (tree var
)
1776 return varpool_node_for_decl (var
)->finalized
;
1779 /* DECL is a VAR_DECL or FUNCTION_DECL which, for whatever reason,
1780 must be emitted in this translation unit. Mark it as such. */
1783 mark_needed (tree decl
)
1785 TREE_USED (decl
) = 1;
1786 mark_decl_referenced (decl
);
1789 /* DECL is either a FUNCTION_DECL or a VAR_DECL. This function
1790 returns true if a definition of this entity should be provided in
1791 this object file. Callers use this function to determine whether
1792 or not to let the back end know that a definition of DECL is
1793 available in this translation unit. */
1796 decl_needed_p (tree decl
)
1798 gcc_assert (TREE_CODE (decl
) == VAR_DECL
1799 || TREE_CODE (decl
) == FUNCTION_DECL
);
1800 /* This function should only be called at the end of the translation
1801 unit. We cannot be sure of whether or not something will be
1802 COMDAT until that point. */
1803 gcc_assert (at_eof
);
1805 /* All entities with external linkage that are not COMDAT should be
1806 emitted; they may be referred to from other object files. */
1807 if (TREE_PUBLIC (decl
) && !DECL_COMDAT (decl
))
1809 /* If this entity was used, let the back end see it; it will decide
1810 whether or not to emit it into the object file. */
1811 if (TREE_USED (decl
))
1813 /* Functions marked "dllexport" must be emitted so that they are
1814 visible to other DLLs. */
1815 if (flag_keep_inline_dllexport
1816 && lookup_attribute ("dllexport", DECL_ATTRIBUTES (decl
)))
1818 /* Otherwise, DECL does not need to be emitted -- yet. A subsequent
1819 reference to DECL might cause it to be emitted later. */
1823 /* If necessary, write out the vtables for the dynamic class CTYPE.
1824 Returns true if any vtables were emitted. */
1827 maybe_emit_vtables (tree ctype
)
1832 struct varpool_node
*current
= NULL
, *last
= NULL
;
1834 /* If the vtables for this class have already been emitted there is
1835 nothing more to do. */
1836 primary_vtbl
= CLASSTYPE_VTABLES (ctype
);
1837 if (var_finalized_p (primary_vtbl
))
1839 /* Ignore dummy vtables made by get_vtable_decl. */
1840 if (TREE_TYPE (primary_vtbl
) == void_type_node
)
1843 /* On some targets, we cannot determine the key method until the end
1844 of the translation unit -- which is when this function is
1846 if (!targetm
.cxx
.key_method_may_be_inline ())
1847 determine_key_method (ctype
);
1849 /* See if any of the vtables are needed. */
1850 for (vtbl
= CLASSTYPE_VTABLES (ctype
); vtbl
; vtbl
= DECL_CHAIN (vtbl
))
1852 import_export_decl (vtbl
);
1853 if (DECL_NOT_REALLY_EXTERN (vtbl
) && decl_needed_p (vtbl
))
1858 /* If the references to this class' vtables are optimized away,
1859 still emit the appropriate debugging information. See
1861 if (DECL_COMDAT (primary_vtbl
)
1862 && CLASSTYPE_DEBUG_REQUESTED (ctype
))
1863 note_debug_info_needed (ctype
);
1867 /* The ABI requires that we emit all of the vtables if we emit any
1869 for (vtbl
= CLASSTYPE_VTABLES (ctype
); vtbl
; vtbl
= DECL_CHAIN (vtbl
))
1871 /* Mark entities references from the virtual table as used. */
1872 mark_vtable_entries (vtbl
);
1874 if (TREE_TYPE (DECL_INITIAL (vtbl
)) == 0)
1876 vec
<tree
, va_gc
> *cleanups
= NULL
;
1877 tree expr
= store_init_value (vtbl
, DECL_INITIAL (vtbl
), &cleanups
,
1880 /* It had better be all done at compile-time. */
1881 gcc_assert (!expr
&& !cleanups
);
1885 DECL_EXTERNAL (vtbl
) = 0;
1886 rest_of_decl_compilation (vtbl
, 1, 1);
1888 /* Because we're only doing syntax-checking, we'll never end up
1889 actually marking the variable as written. */
1890 if (flag_syntax_only
)
1891 TREE_ASM_WRITTEN (vtbl
) = 1;
1892 else if (DECL_ONE_ONLY (vtbl
))
1894 current
= varpool_node_for_decl (vtbl
);
1896 symtab_add_to_same_comdat_group ((symtab_node
) current
, (symtab_node
) last
);
1901 /* Since we're writing out the vtable here, also write the debug
1903 note_debug_info_needed (ctype
);
1908 /* A special return value from type_visibility meaning internal
1911 enum { VISIBILITY_ANON
= VISIBILITY_INTERNAL
+1 };
1913 /* walk_tree helper function for type_visibility. */
1916 min_vis_r (tree
*tp
, int *walk_subtrees
, void *data
)
1918 int *vis_p
= (int *)data
;
1923 else if (TAGGED_TYPE_P (*tp
)
1924 && !TREE_PUBLIC (TYPE_MAIN_DECL (*tp
)))
1926 *vis_p
= VISIBILITY_ANON
;
1929 else if (CLASS_TYPE_P (*tp
)
1930 && CLASSTYPE_VISIBILITY (*tp
) > *vis_p
)
1931 *vis_p
= CLASSTYPE_VISIBILITY (*tp
);
1935 /* Returns the visibility of TYPE, which is the minimum visibility of its
1939 type_visibility (tree type
)
1941 int vis
= VISIBILITY_DEFAULT
;
1942 cp_walk_tree_without_duplicates (&type
, min_vis_r
, &vis
);
1946 /* Limit the visibility of DECL to VISIBILITY, if not explicitly
1947 specified (or if VISIBILITY is static). If TMPL is true, this
1948 constraint is for a template argument, and takes precedence
1949 over explicitly-specified visibility on the template. */
1952 constrain_visibility (tree decl
, int visibility
, bool tmpl
)
1954 if (visibility
== VISIBILITY_ANON
)
1956 /* extern "C" declarations aren't affected by the anonymous
1958 if (!DECL_EXTERN_C_P (decl
))
1960 TREE_PUBLIC (decl
) = 0;
1961 DECL_WEAK (decl
) = 0;
1962 DECL_COMMON (decl
) = 0;
1963 DECL_COMDAT_GROUP (decl
) = NULL_TREE
;
1964 DECL_INTERFACE_KNOWN (decl
) = 1;
1965 if (DECL_LANG_SPECIFIC (decl
))
1966 DECL_NOT_REALLY_EXTERN (decl
) = 1;
1969 else if (visibility
> DECL_VISIBILITY (decl
)
1970 && (tmpl
|| !DECL_VISIBILITY_SPECIFIED (decl
)))
1972 DECL_VISIBILITY (decl
) = (enum symbol_visibility
) visibility
;
1973 /* This visibility was not specified. */
1974 DECL_VISIBILITY_SPECIFIED (decl
) = false;
1978 /* Constrain the visibility of DECL based on the visibility of its template
1982 constrain_visibility_for_template (tree decl
, tree targs
)
1984 /* If this is a template instantiation, check the innermost
1985 template args for visibility constraints. The outer template
1986 args are covered by the class check. */
1987 tree args
= INNERMOST_TEMPLATE_ARGS (targs
);
1989 for (i
= TREE_VEC_LENGTH (args
); i
> 0; --i
)
1993 tree arg
= TREE_VEC_ELT (args
, i
-1);
1995 vis
= type_visibility (arg
);
1996 else if (TREE_TYPE (arg
) && POINTER_TYPE_P (TREE_TYPE (arg
)))
1999 if (TREE_CODE (arg
) == ADDR_EXPR
)
2000 arg
= TREE_OPERAND (arg
, 0);
2001 if (TREE_CODE (arg
) == VAR_DECL
2002 || TREE_CODE (arg
) == FUNCTION_DECL
)
2004 if (! TREE_PUBLIC (arg
))
2005 vis
= VISIBILITY_ANON
;
2007 vis
= DECL_VISIBILITY (arg
);
2011 constrain_visibility (decl
, vis
, true);
2015 /* Like c_determine_visibility, but with additional C++-specific
2018 Function-scope entities can rely on the function's visibility because
2019 it is set in start_preparsed_function.
2021 Class-scope entities cannot rely on the class's visibility until the end
2022 of the enclosing class definition.
2024 Note that because namespaces have multiple independent definitions,
2025 namespace visibility is handled elsewhere using the #pragma visibility
2026 machinery rather than by decorating the namespace declaration.
2028 The goal is for constraints from the type to give a diagnostic, and
2029 other constraints to be applied silently. */
2032 determine_visibility (tree decl
)
2034 tree class_type
= NULL_TREE
;
2036 bool orig_visibility_specified
;
2037 enum symbol_visibility orig_visibility
;
2039 /* Remember that all decls get VISIBILITY_DEFAULT when built. */
2041 /* Only relevant for names with external linkage. */
2042 if (!TREE_PUBLIC (decl
))
2045 /* Cloned constructors and destructors get the same visibility as
2046 the underlying function. That should be set up in
2047 maybe_clone_body. */
2048 gcc_assert (!DECL_CLONED_FUNCTION_P (decl
));
2050 orig_visibility_specified
= DECL_VISIBILITY_SPECIFIED (decl
);
2051 orig_visibility
= DECL_VISIBILITY (decl
);
2053 if (TREE_CODE (decl
) == TYPE_DECL
)
2055 if (CLASS_TYPE_P (TREE_TYPE (decl
)))
2056 use_template
= CLASSTYPE_USE_TEMPLATE (TREE_TYPE (decl
));
2057 else if (TYPE_TEMPLATE_INFO (TREE_TYPE (decl
)))
2062 else if (DECL_LANG_SPECIFIC (decl
))
2063 use_template
= DECL_USE_TEMPLATE (decl
);
2067 /* If DECL is a member of a class, visibility specifiers on the
2068 class can influence the visibility of the DECL. */
2069 if (DECL_CLASS_SCOPE_P (decl
))
2070 class_type
= DECL_CONTEXT (decl
);
2073 /* Not a class member. */
2075 /* Virtual tables have DECL_CONTEXT set to their associated class,
2076 so they are automatically handled above. */
2077 gcc_assert (TREE_CODE (decl
) != VAR_DECL
2078 || !DECL_VTABLE_OR_VTT_P (decl
));
2080 if (DECL_FUNCTION_SCOPE_P (decl
) && ! DECL_VISIBILITY_SPECIFIED (decl
))
2082 /* Local statics and classes get the visibility of their
2083 containing function by default, except that
2084 -fvisibility-inlines-hidden doesn't affect them. */
2085 tree fn
= DECL_CONTEXT (decl
);
2086 if (DECL_VISIBILITY_SPECIFIED (fn
))
2088 DECL_VISIBILITY (decl
) = DECL_VISIBILITY (fn
);
2089 DECL_VISIBILITY_SPECIFIED (decl
) =
2090 DECL_VISIBILITY_SPECIFIED (fn
);
2094 if (DECL_CLASS_SCOPE_P (fn
))
2095 determine_visibility_from_class (decl
, DECL_CONTEXT (fn
));
2096 else if (determine_hidden_inline (fn
))
2098 DECL_VISIBILITY (decl
) = default_visibility
;
2099 DECL_VISIBILITY_SPECIFIED (decl
) =
2100 visibility_options
.inpragma
;
2104 DECL_VISIBILITY (decl
) = DECL_VISIBILITY (fn
);
2105 DECL_VISIBILITY_SPECIFIED (decl
) =
2106 DECL_VISIBILITY_SPECIFIED (fn
);
2110 /* Local classes in templates have CLASSTYPE_USE_TEMPLATE set,
2111 but have no TEMPLATE_INFO, so don't try to check it. */
2114 else if (TREE_CODE (decl
) == VAR_DECL
&& DECL_TINFO_P (decl
)
2115 && flag_visibility_ms_compat
)
2117 /* Under -fvisibility-ms-compat, types are visible by default,
2118 even though their contents aren't. */
2119 tree underlying_type
= TREE_TYPE (DECL_NAME (decl
));
2120 int underlying_vis
= type_visibility (underlying_type
);
2121 if (underlying_vis
== VISIBILITY_ANON
2122 || (CLASS_TYPE_P (underlying_type
)
2123 && CLASSTYPE_VISIBILITY_SPECIFIED (underlying_type
)))
2124 constrain_visibility (decl
, underlying_vis
, false);
2126 DECL_VISIBILITY (decl
) = VISIBILITY_DEFAULT
;
2128 else if (TREE_CODE (decl
) == VAR_DECL
&& DECL_TINFO_P (decl
))
2130 /* tinfo visibility is based on the type it's for. */
2131 constrain_visibility
2132 (decl
, type_visibility (TREE_TYPE (DECL_NAME (decl
))), false);
2134 /* Give the target a chance to override the visibility associated
2136 if (TREE_PUBLIC (decl
)
2137 && !DECL_REALLY_EXTERN (decl
)
2138 && CLASS_TYPE_P (TREE_TYPE (DECL_NAME (decl
)))
2139 && !CLASSTYPE_VISIBILITY_SPECIFIED (TREE_TYPE (DECL_NAME (decl
))))
2140 targetm
.cxx
.determine_class_data_visibility (decl
);
2142 else if (use_template
)
2143 /* Template instantiations and specializations get visibility based
2144 on their template unless they override it with an attribute. */;
2145 else if (! DECL_VISIBILITY_SPECIFIED (decl
))
2147 if (determine_hidden_inline (decl
))
2148 DECL_VISIBILITY (decl
) = VISIBILITY_HIDDEN
;
2151 /* Set default visibility to whatever the user supplied with
2152 #pragma GCC visibility or a namespace visibility attribute. */
2153 DECL_VISIBILITY (decl
) = default_visibility
;
2154 DECL_VISIBILITY_SPECIFIED (decl
) = visibility_options
.inpragma
;
2161 /* If the specialization doesn't specify visibility, use the
2162 visibility from the template. */
2163 tree tinfo
= (TREE_CODE (decl
) == TYPE_DECL
2164 ? TYPE_TEMPLATE_INFO (TREE_TYPE (decl
))
2165 : DECL_TEMPLATE_INFO (decl
));
2166 tree args
= TI_ARGS (tinfo
);
2167 tree attribs
= (TREE_CODE (decl
) == TYPE_DECL
2168 ? TYPE_ATTRIBUTES (TREE_TYPE (decl
))
2169 : DECL_ATTRIBUTES (decl
));
2171 if (args
!= error_mark_node
)
2173 tree pattern
= DECL_TEMPLATE_RESULT (TI_TEMPLATE (tinfo
));
2175 if (!DECL_VISIBILITY_SPECIFIED (decl
))
2177 if (!DECL_VISIBILITY_SPECIFIED (pattern
)
2178 && determine_hidden_inline (decl
))
2179 DECL_VISIBILITY (decl
) = VISIBILITY_HIDDEN
;
2182 DECL_VISIBILITY (decl
) = DECL_VISIBILITY (pattern
);
2183 DECL_VISIBILITY_SPECIFIED (decl
)
2184 = DECL_VISIBILITY_SPECIFIED (pattern
);
2189 /* Template argument visibility outweighs #pragma or namespace
2190 visibility, but not an explicit attribute. */
2191 && !lookup_attribute ("visibility", attribs
))
2193 int depth
= TMPL_ARGS_DEPTH (args
);
2194 int class_depth
= 0;
2195 if (class_type
&& CLASSTYPE_TEMPLATE_INFO (class_type
))
2196 class_depth
= TMPL_ARGS_DEPTH (CLASSTYPE_TI_ARGS (class_type
));
2197 if (DECL_VISIBILITY_SPECIFIED (decl
))
2199 /* A class template member with explicit visibility
2200 overrides the class visibility, so we need to apply
2201 all the levels of template args directly. */
2203 for (i
= 1; i
<= depth
; ++i
)
2205 tree lev
= TMPL_ARGS_LEVEL (args
, i
);
2206 constrain_visibility_for_template (decl
, lev
);
2209 else if (depth
> class_depth
)
2210 /* Limit visibility based on its template arguments. */
2211 constrain_visibility_for_template (decl
, args
);
2217 determine_visibility_from_class (decl
, class_type
);
2219 if (decl_anon_ns_mem_p (decl
))
2220 /* Names in an anonymous namespace get internal linkage.
2221 This might change once we implement export. */
2222 constrain_visibility (decl
, VISIBILITY_ANON
, false);
2223 else if (TREE_CODE (decl
) != TYPE_DECL
)
2225 /* Propagate anonymity from type to decl. */
2226 int tvis
= type_visibility (TREE_TYPE (decl
));
2227 if (tvis
== VISIBILITY_ANON
2228 || ! DECL_VISIBILITY_SPECIFIED (decl
))
2229 constrain_visibility (decl
, tvis
, false);
2231 else if (no_linkage_check (TREE_TYPE (decl
), /*relaxed_p=*/true))
2232 /* DR 757: A type without linkage shall not be used as the type of a
2233 variable or function with linkage, unless
2234 o the variable or function has extern "C" linkage (7.5 [dcl.link]), or
2235 o the variable or function is not used (3.2 [basic.def.odr]) or is
2236 defined in the same translation unit.
2238 Since non-extern "C" decls need to be defined in the same
2239 translation unit, we can make the type internal. */
2240 constrain_visibility (decl
, VISIBILITY_ANON
, false);
2242 /* If visibility changed and DECL already has DECL_RTL, ensure
2243 symbol flags are updated. */
2244 if ((DECL_VISIBILITY (decl
) != orig_visibility
2245 || DECL_VISIBILITY_SPECIFIED (decl
) != orig_visibility_specified
)
2246 && ((TREE_CODE (decl
) == VAR_DECL
&& TREE_STATIC (decl
))
2247 || TREE_CODE (decl
) == FUNCTION_DECL
)
2248 && DECL_RTL_SET_P (decl
))
2249 make_decl_rtl (decl
);
2252 /* By default, static data members and function members receive
2253 the visibility of their containing class. */
2256 determine_visibility_from_class (tree decl
, tree class_type
)
2258 if (DECL_VISIBILITY_SPECIFIED (decl
))
2261 if (determine_hidden_inline (decl
))
2262 DECL_VISIBILITY (decl
) = VISIBILITY_HIDDEN
;
2265 /* Default to the class visibility. */
2266 DECL_VISIBILITY (decl
) = CLASSTYPE_VISIBILITY (class_type
);
2267 DECL_VISIBILITY_SPECIFIED (decl
)
2268 = CLASSTYPE_VISIBILITY_SPECIFIED (class_type
);
2271 /* Give the target a chance to override the visibility associated
2273 if (TREE_CODE (decl
) == VAR_DECL
2274 && (DECL_TINFO_P (decl
)
2275 || (DECL_VTABLE_OR_VTT_P (decl
)
2276 /* Construction virtual tables are not exported because
2277 they cannot be referred to from other object files;
2278 their name is not standardized by the ABI. */
2279 && !DECL_CONSTRUCTION_VTABLE_P (decl
)))
2280 && TREE_PUBLIC (decl
)
2281 && !DECL_REALLY_EXTERN (decl
)
2282 && !CLASSTYPE_VISIBILITY_SPECIFIED (class_type
))
2283 targetm
.cxx
.determine_class_data_visibility (decl
);
2286 /* Returns true iff DECL is an inline that should get hidden visibility
2287 because of -fvisibility-inlines-hidden. */
2290 determine_hidden_inline (tree decl
)
2292 return (visibility_options
.inlines_hidden
2293 /* Don't do this for inline templates; specializations might not be
2294 inline, and we don't want them to inherit the hidden
2295 visibility. We'll set it here for all inline instantiations. */
2296 && !processing_template_decl
2297 && TREE_CODE (decl
) == FUNCTION_DECL
2298 && DECL_DECLARED_INLINE_P (decl
)
2299 && (! DECL_LANG_SPECIFIC (decl
)
2300 || ! DECL_EXPLICIT_INSTANTIATION (decl
)));
2303 /* Constrain the visibility of a class TYPE based on the visibility of its
2304 field types. Warn if any fields require lesser visibility. */
2307 constrain_class_visibility (tree type
)
2313 int vis
= type_visibility (type
);
2315 if (vis
== VISIBILITY_ANON
2316 || DECL_IN_SYSTEM_HEADER (TYPE_MAIN_DECL (type
)))
2319 /* Don't warn about visibility if the class has explicit visibility. */
2320 if (CLASSTYPE_VISIBILITY_SPECIFIED (type
))
2321 vis
= VISIBILITY_INTERNAL
;
2323 for (t
= TYPE_FIELDS (type
); t
; t
= DECL_CHAIN (t
))
2324 if (TREE_CODE (t
) == FIELD_DECL
&& TREE_TYPE (t
) != error_mark_node
)
2326 tree ftype
= strip_pointer_or_array_types (TREE_TYPE (t
));
2327 int subvis
= type_visibility (ftype
);
2329 if (subvis
== VISIBILITY_ANON
)
2331 if (!in_main_input_context ())
2333 %qT has a field %qD whose type uses the anonymous namespace",
2336 else if (MAYBE_CLASS_TYPE_P (ftype
)
2337 && vis
< VISIBILITY_HIDDEN
2338 && subvis
>= VISIBILITY_HIDDEN
)
2339 warning (OPT_Wattributes
, "\
2340 %qT declared with greater visibility than the type of its field %qD",
2344 binfo
= TYPE_BINFO (type
);
2345 for (i
= 0; BINFO_BASE_ITERATE (binfo
, i
, t
); ++i
)
2347 int subvis
= type_visibility (TREE_TYPE (t
));
2349 if (subvis
== VISIBILITY_ANON
)
2351 if (!in_main_input_context())
2353 %qT has a base %qT whose type uses the anonymous namespace",
2354 type
, TREE_TYPE (t
));
2356 else if (vis
< VISIBILITY_HIDDEN
2357 && subvis
>= VISIBILITY_HIDDEN
)
2358 warning (OPT_Wattributes
, "\
2359 %qT declared with greater visibility than its base %qT",
2360 type
, TREE_TYPE (t
));
2364 /* DECL is a FUNCTION_DECL or VAR_DECL. If the object file linkage
2365 for DECL has not already been determined, do so now by setting
2366 DECL_EXTERNAL, DECL_COMDAT and other related flags. Until this
2367 function is called entities with vague linkage whose definitions
2368 are available must have TREE_PUBLIC set.
2370 If this function decides to place DECL in COMDAT, it will set
2371 appropriate flags -- but will not clear DECL_EXTERNAL. It is up to
2372 the caller to decide whether or not to clear DECL_EXTERNAL. Some
2373 callers defer that decision until it is clear that DECL is actually
2377 import_export_decl (tree decl
)
2382 tree class_type
= NULL_TREE
;
2384 if (DECL_INTERFACE_KNOWN (decl
))
2387 /* We cannot determine what linkage to give to an entity with vague
2388 linkage until the end of the file. For example, a virtual table
2389 for a class will be defined if and only if the key method is
2390 defined in this translation unit. As a further example, consider
2391 that when compiling a translation unit that uses PCH file with
2392 "-frepo" it would be incorrect to make decisions about what
2393 entities to emit when building the PCH; those decisions must be
2394 delayed until the repository information has been processed. */
2395 gcc_assert (at_eof
);
2396 /* Object file linkage for explicit instantiations is handled in
2397 mark_decl_instantiated. For static variables in functions with
2398 vague linkage, maybe_commonize_var is used.
2400 Therefore, the only declarations that should be provided to this
2401 function are those with external linkage that are:
2403 * implicit instantiations of function templates
2407 * implicit instantiations of static data members of class
2414 Furthermore, all entities that reach this point must have a
2415 definition available in this translation unit.
2417 The following assertions check these conditions. */
2418 gcc_assert (TREE_CODE (decl
) == FUNCTION_DECL
2419 || TREE_CODE (decl
) == VAR_DECL
);
2420 /* Any code that creates entities with TREE_PUBLIC cleared should
2421 also set DECL_INTERFACE_KNOWN. */
2422 gcc_assert (TREE_PUBLIC (decl
));
2423 if (TREE_CODE (decl
) == FUNCTION_DECL
)
2424 gcc_assert (DECL_IMPLICIT_INSTANTIATION (decl
)
2425 || DECL_FRIEND_PSEUDO_TEMPLATE_INSTANTIATION (decl
)
2426 || DECL_DECLARED_INLINE_P (decl
));
2428 gcc_assert (DECL_IMPLICIT_INSTANTIATION (decl
)
2429 || DECL_VTABLE_OR_VTT_P (decl
)
2430 || DECL_TINFO_P (decl
));
2431 /* Check that a definition of DECL is available in this translation
2433 gcc_assert (!DECL_REALLY_EXTERN (decl
));
2435 /* Assume that DECL will not have COMDAT linkage. */
2437 /* Assume that DECL will not be imported into this translation
2441 /* See if the repository tells us whether or not to emit DECL in
2442 this translation unit. */
2443 emit_p
= repo_emit_p (decl
);
2446 else if (emit_p
== 1)
2448 /* The repository indicates that this entity should be defined
2449 here. Make sure the back end honors that request. */
2450 if (TREE_CODE (decl
) == VAR_DECL
)
2452 else if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (decl
)
2453 || DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P (decl
))
2456 FOR_EACH_CLONE (clone
, decl
)
2457 mark_needed (clone
);
2461 /* Output the definition as an ordinary strong definition. */
2462 DECL_EXTERNAL (decl
) = 0;
2463 DECL_INTERFACE_KNOWN (decl
) = 1;
2468 /* We have already decided what to do with this DECL; there is no
2469 need to check anything further. */
2471 else if (TREE_CODE (decl
) == VAR_DECL
&& DECL_VTABLE_OR_VTT_P (decl
))
2473 class_type
= DECL_CONTEXT (decl
);
2474 import_export_class (class_type
);
2475 if (TYPE_FOR_JAVA (class_type
))
2477 else if (CLASSTYPE_INTERFACE_KNOWN (class_type
)
2478 && CLASSTYPE_INTERFACE_ONLY (class_type
))
2480 else if ((!flag_weak
|| TARGET_WEAK_NOT_IN_ARCHIVE_TOC
)
2481 && !CLASSTYPE_USE_TEMPLATE (class_type
)
2482 && CLASSTYPE_KEY_METHOD (class_type
)
2483 && !DECL_DECLARED_INLINE_P (CLASSTYPE_KEY_METHOD (class_type
)))
2484 /* The ABI requires that all virtual tables be emitted with
2485 COMDAT linkage. However, on systems where COMDAT symbols
2486 don't show up in the table of contents for a static
2487 archive, or on systems without weak symbols (where we
2488 approximate COMDAT linkage by using internal linkage), the
2489 linker will report errors about undefined symbols because
2490 it will not see the virtual table definition. Therefore,
2491 in the case that we know that the virtual table will be
2492 emitted in only one translation unit, we make the virtual
2493 table an ordinary definition with external linkage. */
2494 DECL_EXTERNAL (decl
) = 0;
2495 else if (CLASSTYPE_INTERFACE_KNOWN (class_type
))
2497 /* CLASS_TYPE is being exported from this translation unit,
2498 so DECL should be defined here. */
2499 if (!flag_weak
&& CLASSTYPE_EXPLICIT_INSTANTIATION (class_type
))
2500 /* If a class is declared in a header with the "extern
2501 template" extension, then it will not be instantiated,
2502 even in translation units that would normally require
2503 it. Often such classes are explicitly instantiated in
2504 one translation unit. Therefore, the explicit
2505 instantiation must be made visible to other translation
2507 DECL_EXTERNAL (decl
) = 0;
2510 /* The generic C++ ABI says that class data is always
2511 COMDAT, even if there is a key function. Some
2512 variants (e.g., the ARM EABI) says that class data
2513 only has COMDAT linkage if the class data might be
2514 emitted in more than one translation unit. When the
2515 key method can be inline and is inline, we still have
2516 to arrange for comdat even though
2517 class_data_always_comdat is false. */
2518 if (!CLASSTYPE_KEY_METHOD (class_type
)
2519 || DECL_DECLARED_INLINE_P (CLASSTYPE_KEY_METHOD (class_type
))
2520 || targetm
.cxx
.class_data_always_comdat ())
2522 /* The ABI requires COMDAT linkage. Normally, we
2523 only emit COMDAT things when they are needed;
2524 make sure that we realize that this entity is
2531 else if (!flag_implicit_templates
2532 && CLASSTYPE_IMPLICIT_INSTANTIATION (class_type
))
2537 else if (TREE_CODE (decl
) == VAR_DECL
&& DECL_TINFO_P (decl
))
2539 tree type
= TREE_TYPE (DECL_NAME (decl
));
2540 if (CLASS_TYPE_P (type
))
2543 import_export_class (type
);
2544 if (CLASSTYPE_INTERFACE_KNOWN (type
)
2545 && TYPE_POLYMORPHIC_P (type
)
2546 && CLASSTYPE_INTERFACE_ONLY (type
)
2547 /* If -fno-rtti was specified, then we cannot be sure
2548 that RTTI information will be emitted with the
2549 virtual table of the class, so we must emit it
2550 wherever it is used. */
2555 if (CLASSTYPE_INTERFACE_KNOWN (type
)
2556 && !CLASSTYPE_INTERFACE_ONLY (type
))
2558 comdat_p
= (targetm
.cxx
.class_data_always_comdat ()
2559 || (CLASSTYPE_KEY_METHOD (type
)
2560 && DECL_DECLARED_INLINE_P (CLASSTYPE_KEY_METHOD (type
))));
2565 DECL_EXTERNAL (decl
) = 0;
2575 else if (DECL_TEMPLATE_INSTANTIATION (decl
)
2576 || DECL_FRIEND_PSEUDO_TEMPLATE_INSTANTIATION (decl
))
2578 /* DECL is an implicit instantiation of a function or static
2580 if ((flag_implicit_templates
2581 && !flag_use_repository
)
2582 || (flag_implicit_inline_templates
2583 && TREE_CODE (decl
) == FUNCTION_DECL
2584 && DECL_DECLARED_INLINE_P (decl
)))
2587 /* If we are not implicitly generating templates, then mark
2588 this entity as undefined in this translation unit. */
2591 else if (DECL_FUNCTION_MEMBER_P (decl
))
2593 if (!DECL_DECLARED_INLINE_P (decl
))
2595 tree ctype
= DECL_CONTEXT (decl
);
2596 import_export_class (ctype
);
2597 if (CLASSTYPE_INTERFACE_KNOWN (ctype
))
2599 DECL_NOT_REALLY_EXTERN (decl
)
2600 = ! (CLASSTYPE_INTERFACE_ONLY (ctype
)
2601 || (DECL_DECLARED_INLINE_P (decl
)
2602 && ! flag_implement_inlines
2603 && !DECL_VINDEX (decl
)));
2605 if (!DECL_NOT_REALLY_EXTERN (decl
))
2606 DECL_EXTERNAL (decl
) = 1;
2608 /* Always make artificials weak. */
2609 if (DECL_ARTIFICIAL (decl
) && flag_weak
)
2612 maybe_make_one_only (decl
);
2623 /* If we are importing DECL into this translation unit, mark is
2624 an undefined here. */
2625 DECL_EXTERNAL (decl
) = 1;
2626 DECL_NOT_REALLY_EXTERN (decl
) = 0;
2630 /* If we decided to put DECL in COMDAT, mark it accordingly at
2632 comdat_linkage (decl
);
2635 DECL_INTERFACE_KNOWN (decl
) = 1;
2638 /* Return an expression that performs the destruction of DECL, which
2639 must be a VAR_DECL whose type has a non-trivial destructor, or is
2640 an array whose (innermost) elements have a non-trivial destructor. */
2643 build_cleanup (tree decl
)
2646 tree type
= TREE_TYPE (decl
);
2648 /* This function should only be called for declarations that really
2649 require cleanups. */
2650 gcc_assert (!TYPE_HAS_TRIVIAL_DESTRUCTOR (type
));
2652 /* Treat all objects with destructors as used; the destructor may do
2653 something substantive. */
2656 if (TREE_CODE (type
) == ARRAY_TYPE
)
2659 temp
= build_address (decl
);
2660 temp
= build_delete (TREE_TYPE (temp
), temp
,
2661 sfk_complete_destructor
,
2662 LOOKUP_NORMAL
|LOOKUP_NONVIRTUAL
|LOOKUP_DESTRUCTOR
, 0,
2663 tf_warning_or_error
);
2667 /* Returns the initialization guard variable for the variable DECL,
2668 which has static storage duration. */
2671 get_guard (tree decl
)
2676 sname
= mangle_guard_variable (decl
);
2677 guard
= IDENTIFIER_GLOBAL_VALUE (sname
);
2682 /* We use a type that is big enough to contain a mutex as well
2683 as an integer counter. */
2684 guard_type
= targetm
.cxx
.guard_type ();
2685 guard
= build_decl (DECL_SOURCE_LOCATION (decl
),
2686 VAR_DECL
, sname
, guard_type
);
2688 /* The guard should have the same linkage as what it guards. */
2689 TREE_PUBLIC (guard
) = TREE_PUBLIC (decl
);
2690 TREE_STATIC (guard
) = TREE_STATIC (decl
);
2691 DECL_COMMON (guard
) = DECL_COMMON (decl
);
2692 DECL_COMDAT (guard
) = DECL_COMDAT (decl
);
2693 DECL_TLS_MODEL (guard
) = DECL_TLS_MODEL (decl
);
2694 if (DECL_ONE_ONLY (decl
))
2695 make_decl_one_only (guard
, cxx_comdat_group (guard
));
2696 if (TREE_PUBLIC (decl
))
2697 DECL_WEAK (guard
) = DECL_WEAK (decl
);
2698 DECL_VISIBILITY (guard
) = DECL_VISIBILITY (decl
);
2699 DECL_VISIBILITY_SPECIFIED (guard
) = DECL_VISIBILITY_SPECIFIED (decl
);
2701 DECL_ARTIFICIAL (guard
) = 1;
2702 DECL_IGNORED_P (guard
) = 1;
2703 TREE_USED (guard
) = 1;
2704 pushdecl_top_level_and_finish (guard
, NULL_TREE
);
2709 /* Return those bits of the GUARD variable that should be set when the
2710 guarded entity is actually initialized. */
2713 get_guard_bits (tree guard
)
2715 if (!targetm
.cxx
.guard_mask_bit ())
2717 /* We only set the first byte of the guard, in order to leave room
2718 for a mutex in the high-order bits. */
2719 guard
= build1 (ADDR_EXPR
,
2720 build_pointer_type (TREE_TYPE (guard
)),
2722 guard
= build1 (NOP_EXPR
,
2723 build_pointer_type (char_type_node
),
2725 guard
= build1 (INDIRECT_REF
, char_type_node
, guard
);
2731 /* Return an expression which determines whether or not the GUARD
2732 variable has already been initialized. */
2735 get_guard_cond (tree guard
)
2739 /* Check to see if the GUARD is zero. */
2740 guard
= get_guard_bits (guard
);
2742 /* Mask off all but the low bit. */
2743 if (targetm
.cxx
.guard_mask_bit ())
2745 guard_value
= integer_one_node
;
2746 if (!same_type_p (TREE_TYPE (guard_value
), TREE_TYPE (guard
)))
2747 guard_value
= convert (TREE_TYPE (guard
), guard_value
);
2748 guard
= cp_build_binary_op (input_location
,
2749 BIT_AND_EXPR
, guard
, guard_value
,
2750 tf_warning_or_error
);
2753 guard_value
= integer_zero_node
;
2754 if (!same_type_p (TREE_TYPE (guard_value
), TREE_TYPE (guard
)))
2755 guard_value
= convert (TREE_TYPE (guard
), guard_value
);
2756 return cp_build_binary_op (input_location
,
2757 EQ_EXPR
, guard
, guard_value
,
2758 tf_warning_or_error
);
2761 /* Return an expression which sets the GUARD variable, indicating that
2762 the variable being guarded has been initialized. */
2765 set_guard (tree guard
)
2769 /* Set the GUARD to one. */
2770 guard
= get_guard_bits (guard
);
2771 guard_init
= integer_one_node
;
2772 if (!same_type_p (TREE_TYPE (guard_init
), TREE_TYPE (guard
)))
2773 guard_init
= convert (TREE_TYPE (guard
), guard_init
);
2774 return cp_build_modify_expr (guard
, NOP_EXPR
, guard_init
,
2775 tf_warning_or_error
);
2778 /* Returns true iff we can tell that VAR does not have a dynamic
2782 var_defined_without_dynamic_init (tree var
)
2784 /* If it's defined in another TU, we can't tell. */
2785 if (DECL_EXTERNAL (var
))
2787 /* If it has a non-trivial destructor, registering the destructor
2788 counts as dynamic initialization. */
2789 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (TREE_TYPE (var
)))
2791 /* If it's in this TU, its initializer has been processed. */
2792 gcc_assert (DECL_INITIALIZED_P (var
));
2793 /* If it has no initializer or a constant one, it's not dynamic. */
2794 return (!DECL_NONTRIVIALLY_INITIALIZED_P (var
)
2795 || DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (var
));
2798 /* Returns true iff VAR is a variable that needs uses to be
2799 wrapped for possible dynamic initialization. */
2802 var_needs_tls_wrapper (tree var
)
2804 return (!error_operand_p (var
)
2805 && DECL_THREAD_LOCAL_P (var
)
2806 && !DECL_GNU_TLS_P (var
)
2807 && !DECL_FUNCTION_SCOPE_P (var
)
2808 && !var_defined_without_dynamic_init (var
));
2811 /* Get the FUNCTION_DECL for the shared TLS init function for this
2812 translation unit. */
2815 get_local_tls_init_fn (void)
2817 tree sname
= get_identifier ("__tls_init");
2818 tree fn
= IDENTIFIER_GLOBAL_VALUE (sname
);
2821 fn
= build_lang_decl (FUNCTION_DECL
, sname
,
2822 build_function_type (void_type_node
,
2824 SET_DECL_LANGUAGE (fn
, lang_c
);
2825 TREE_PUBLIC (fn
) = false;
2826 DECL_ARTIFICIAL (fn
) = true;
2828 SET_IDENTIFIER_GLOBAL_VALUE (sname
, fn
);
2833 /* Get a FUNCTION_DECL for the init function for the thread_local
2834 variable VAR. The init function will be an alias to the function
2835 that initializes all the non-local TLS variables in the translation
2836 unit. The init function is only used by the wrapper function. */
2839 get_tls_init_fn (tree var
)
2841 /* Only C++11 TLS vars need this init fn. */
2842 if (!var_needs_tls_wrapper (var
))
2845 /* If -fno-extern-tls-init, assume that we don't need to call
2846 a tls init function for a variable defined in another TU. */
2847 if (!flag_extern_tls_init
&& DECL_EXTERNAL (var
))
2850 #ifdef ASM_OUTPUT_DEF
2851 /* If the variable is internal, or if we can't generate aliases,
2852 call the local init function directly. */
2853 if (!TREE_PUBLIC (var
))
2855 return get_local_tls_init_fn ();
2857 tree sname
= mangle_tls_init_fn (var
);
2858 tree fn
= IDENTIFIER_GLOBAL_VALUE (sname
);
2861 fn
= build_lang_decl (FUNCTION_DECL
, sname
,
2862 build_function_type (void_type_node
,
2864 SET_DECL_LANGUAGE (fn
, lang_c
);
2865 TREE_PUBLIC (fn
) = TREE_PUBLIC (var
);
2866 DECL_ARTIFICIAL (fn
) = true;
2867 DECL_COMDAT (fn
) = DECL_COMDAT (var
);
2868 DECL_EXTERNAL (fn
) = true;
2869 if (DECL_ONE_ONLY (var
))
2870 make_decl_one_only (fn
, cxx_comdat_group (fn
));
2871 if (TREE_PUBLIC (var
))
2873 tree obtype
= strip_array_types (non_reference (TREE_TYPE (var
)));
2874 /* If the variable is defined somewhere else and might have static
2875 initialization, make the init function a weak reference. */
2876 if ((!TYPE_NEEDS_CONSTRUCTING (obtype
)
2877 || TYPE_HAS_CONSTEXPR_CTOR (obtype
))
2878 && TYPE_HAS_TRIVIAL_DESTRUCTOR (obtype
)
2879 && DECL_EXTERNAL (var
))
2882 DECL_WEAK (fn
) = DECL_WEAK (var
);
2884 DECL_VISIBILITY (fn
) = DECL_VISIBILITY (var
);
2885 DECL_VISIBILITY_SPECIFIED (fn
) = DECL_VISIBILITY_SPECIFIED (var
);
2886 DECL_DLLIMPORT_P (fn
) = DECL_DLLIMPORT_P (var
);
2887 DECL_IGNORED_P (fn
) = 1;
2890 DECL_BEFRIENDING_CLASSES (fn
) = var
;
2892 SET_IDENTIFIER_GLOBAL_VALUE (sname
, fn
);
2897 /* Get a FUNCTION_DECL for the init wrapper function for the thread_local
2898 variable VAR. The wrapper function calls the init function (if any) for
2899 VAR and then returns a reference to VAR. The wrapper function is used
2900 in place of VAR everywhere VAR is mentioned. */
2903 get_tls_wrapper_fn (tree var
)
2905 /* Only C++11 TLS vars need this wrapper fn. */
2906 if (!var_needs_tls_wrapper (var
))
2909 tree sname
= mangle_tls_wrapper_fn (var
);
2910 tree fn
= IDENTIFIER_GLOBAL_VALUE (sname
);
2913 /* A named rvalue reference is an lvalue, so the wrapper should
2914 always return an lvalue reference. */
2915 tree type
= non_reference (TREE_TYPE (var
));
2916 type
= build_reference_type (type
);
2917 tree fntype
= build_function_type (type
, void_list_node
);
2918 fn
= build_lang_decl (FUNCTION_DECL
, sname
, fntype
);
2919 SET_DECL_LANGUAGE (fn
, lang_c
);
2920 TREE_PUBLIC (fn
) = TREE_PUBLIC (var
);
2921 DECL_ARTIFICIAL (fn
) = true;
2922 DECL_IGNORED_P (fn
) = 1;
2923 /* The wrapper is inline and emitted everywhere var is used. */
2924 DECL_DECLARED_INLINE_P (fn
) = true;
2925 if (TREE_PUBLIC (var
))
2927 comdat_linkage (fn
);
2928 #ifdef HAVE_GAS_HIDDEN
2929 /* Make the wrapper bind locally; there's no reason to share
2930 the wrapper between multiple shared objects. */
2931 DECL_VISIBILITY (fn
) = VISIBILITY_INTERNAL
;
2932 DECL_VISIBILITY_SPECIFIED (fn
) = true;
2935 if (!TREE_PUBLIC (fn
))
2936 DECL_INTERFACE_KNOWN (fn
) = true;
2938 note_vague_linkage_fn (fn
);
2941 /* We want CSE to commonize calls to the wrapper, but marking it as
2942 pure is unsafe since it has side-effects. I guess we need a new
2943 ECF flag even weaker than ECF_PURE. FIXME! */
2944 DECL_PURE_P (fn
) = true;
2947 DECL_BEFRIENDING_CLASSES (fn
) = var
;
2949 SET_IDENTIFIER_GLOBAL_VALUE (sname
, fn
);
2954 /* At EOF, generate the definition for the TLS wrapper function FN:
2957 if (init_fn) init_fn();
2962 generate_tls_wrapper (tree fn
)
2964 tree var
= DECL_BEFRIENDING_CLASSES (fn
);
2966 start_preparsed_function (fn
, NULL_TREE
, SF_DEFAULT
| SF_PRE_PARSED
);
2967 tree body
= begin_function_body ();
2968 /* Only call the init fn if there might be one. */
2969 if (tree init_fn
= get_tls_init_fn (var
))
2971 tree if_stmt
= NULL_TREE
;
2972 /* If init_fn is a weakref, make sure it exists before calling. */
2973 if (lookup_attribute ("weak", DECL_ATTRIBUTES (init_fn
)))
2975 if_stmt
= begin_if_stmt ();
2976 tree addr
= cp_build_addr_expr (init_fn
, tf_warning_or_error
);
2977 tree cond
= cp_build_binary_op (DECL_SOURCE_LOCATION (var
),
2978 NE_EXPR
, addr
, nullptr_node
,
2979 tf_warning_or_error
);
2980 finish_if_stmt_cond (cond
, if_stmt
);
2982 finish_expr_stmt (build_cxx_call
2983 (init_fn
, 0, NULL
, tf_warning_or_error
));
2986 finish_then_clause (if_stmt
);
2987 finish_if_stmt (if_stmt
);
2991 /* If there's no initialization, the wrapper is a constant function. */
2992 TREE_READONLY (fn
) = true;
2993 finish_return_stmt (convert_from_reference (var
));
2994 finish_function_body (body
);
2995 expand_or_defer_fn (finish_function (0));
2998 /* Start the process of running a particular set of global constructors
2999 or destructors. Subroutine of do_[cd]tors. */
3002 start_objects (int method_type
, int initp
)
3008 /* Make ctor or dtor function. METHOD_TYPE may be 'I' or 'D'. */
3010 if (initp
!= DEFAULT_INIT_PRIORITY
)
3020 sprintf (type
, "sub_%c%c%.5u", method_type
, joiner
, initp
);
3023 sprintf (type
, "sub_%c", method_type
);
3025 fndecl
= build_lang_decl (FUNCTION_DECL
,
3026 get_file_function_name (type
),
3027 build_function_type_list (void_type_node
,
3029 start_preparsed_function (fndecl
, /*attrs=*/NULL_TREE
, SF_PRE_PARSED
);
3031 TREE_PUBLIC (current_function_decl
) = 0;
3033 /* Mark as artificial because it's not explicitly in the user's
3035 DECL_ARTIFICIAL (current_function_decl
) = 1;
3037 /* Mark this declaration as used to avoid spurious warnings. */
3038 TREE_USED (current_function_decl
) = 1;
3040 /* Mark this function as a global constructor or destructor. */
3041 if (method_type
== 'I')
3042 DECL_GLOBAL_CTOR_P (current_function_decl
) = 1;
3044 DECL_GLOBAL_DTOR_P (current_function_decl
) = 1;
3046 body
= begin_compound_stmt (BCS_FN_BODY
);
3051 /* Finish the process of running a particular set of global constructors
3052 or destructors. Subroutine of do_[cd]tors. */
3055 finish_objects (int method_type
, int initp
, tree body
)
3060 finish_compound_stmt (body
);
3061 fn
= finish_function (0);
3063 if (method_type
== 'I')
3065 DECL_STATIC_CONSTRUCTOR (fn
) = 1;
3066 decl_init_priority_insert (fn
, initp
);
3070 DECL_STATIC_DESTRUCTOR (fn
) = 1;
3071 decl_fini_priority_insert (fn
, initp
);
3074 expand_or_defer_fn (fn
);
3077 /* The names of the parameters to the function created to handle
3078 initializations and destructions for objects with static storage
3080 #define INITIALIZE_P_IDENTIFIER "__initialize_p"
3081 #define PRIORITY_IDENTIFIER "__priority"
3083 /* The name of the function we create to handle initializations and
3084 destructions for objects with static storage duration. */
3085 #define SSDF_IDENTIFIER "__static_initialization_and_destruction"
3087 /* The declaration for the __INITIALIZE_P argument. */
3088 static GTY(()) tree initialize_p_decl
;
3090 /* The declaration for the __PRIORITY argument. */
3091 static GTY(()) tree priority_decl
;
3093 /* The declaration for the static storage duration function. */
3094 static GTY(()) tree ssdf_decl
;
3096 /* All the static storage duration functions created in this
3097 translation unit. */
3098 static GTY(()) vec
<tree
, va_gc
> *ssdf_decls
;
3100 /* A map from priority levels to information about that priority
3101 level. There may be many such levels, so efficient lookup is
3103 static splay_tree priority_info_map
;
3105 /* Begins the generation of the function that will handle all
3106 initialization and destruction of objects with static storage
3107 duration. The function generated takes two parameters of type
3108 `int': __INITIALIZE_P and __PRIORITY. If __INITIALIZE_P is
3109 nonzero, it performs initializations. Otherwise, it performs
3110 destructions. It only performs those initializations or
3111 destructions with the indicated __PRIORITY. The generated function
3114 It is assumed that this function will only be called once per
3115 translation unit. */
3118 start_static_storage_duration_function (unsigned count
)
3122 char id
[sizeof (SSDF_IDENTIFIER
) + 1 /* '\0' */ + 64];
3124 /* Create the identifier for this function. It will be of the form
3125 SSDF_IDENTIFIER_<number>. */
3126 sprintf (id
, "%s_%u", SSDF_IDENTIFIER
, count
);
3127 if (L_IPO_IS_AUXILIARY_MODULE
)
3128 sprintf (id
, "%s.cmo.%u", id
, current_module_id
);
3130 type
= build_function_type_list (void_type_node
,
3131 integer_type_node
, integer_type_node
,
3134 /* Create the FUNCTION_DECL itself. */
3135 ssdf_decl
= build_lang_decl (FUNCTION_DECL
,
3136 get_identifier (id
),
3138 TREE_PUBLIC (ssdf_decl
) = 0;
3139 DECL_ARTIFICIAL (ssdf_decl
) = 1;
3141 /* Put this function in the list of functions to be called from the
3142 static constructors and destructors. */
3145 vec_alloc (ssdf_decls
, 32);
3147 /* Take this opportunity to initialize the map from priority
3148 numbers to information about that priority level. */
3149 priority_info_map
= splay_tree_new (splay_tree_compare_ints
,
3150 /*delete_key_fn=*/0,
3151 /*delete_value_fn=*/
3152 (splay_tree_delete_value_fn
) &free
);
3154 /* We always need to generate functions for the
3155 DEFAULT_INIT_PRIORITY so enter it now. That way when we walk
3156 priorities later, we'll be sure to find the
3157 DEFAULT_INIT_PRIORITY. */
3158 get_priority_info (DEFAULT_INIT_PRIORITY
);
3161 vec_safe_push (ssdf_decls
, ssdf_decl
);
3163 /* Create the argument list. */
3164 initialize_p_decl
= cp_build_parm_decl
3165 (get_identifier (INITIALIZE_P_IDENTIFIER
), integer_type_node
);
3166 DECL_CONTEXT (initialize_p_decl
) = ssdf_decl
;
3167 TREE_USED (initialize_p_decl
) = 1;
3168 priority_decl
= cp_build_parm_decl
3169 (get_identifier (PRIORITY_IDENTIFIER
), integer_type_node
);
3170 DECL_CONTEXT (priority_decl
) = ssdf_decl
;
3171 TREE_USED (priority_decl
) = 1;
3173 DECL_CHAIN (initialize_p_decl
) = priority_decl
;
3174 DECL_ARGUMENTS (ssdf_decl
) = initialize_p_decl
;
3176 /* Put the function in the global scope. */
3177 pushdecl (ssdf_decl
);
3179 /* Start the function itself. This is equivalent to declaring the
3182 static void __ssdf (int __initialize_p, init __priority_p);
3184 It is static because we only need to call this function from the
3185 various constructor and destructor functions for this module. */
3186 start_preparsed_function (ssdf_decl
,
3187 /*attrs=*/NULL_TREE
,
3190 /* Set up the scope of the outermost block in the function. */
3191 body
= begin_compound_stmt (BCS_FN_BODY
);
3196 /* Finish the generation of the function which performs initialization
3197 and destruction of objects with static storage duration. After
3198 this point, no more such objects can be created. */
3201 finish_static_storage_duration_function (tree body
)
3203 /* Close out the function. */
3204 finish_compound_stmt (body
);
3205 expand_or_defer_fn (finish_function (0));
3208 /* Return the information about the indicated PRIORITY level. If no
3209 code to handle this level has yet been generated, generate the
3210 appropriate prologue. */
3212 static priority_info
3213 get_priority_info (int priority
)
3218 n
= splay_tree_lookup (priority_info_map
,
3219 (splay_tree_key
) priority
);
3222 /* Create a new priority information structure, and insert it
3224 pi
= XNEW (struct priority_info_s
);
3225 pi
->initializations_p
= 0;
3226 pi
->destructions_p
= 0;
3227 splay_tree_insert (priority_info_map
,
3228 (splay_tree_key
) priority
,
3229 (splay_tree_value
) pi
);
3232 pi
= (priority_info
) n
->value
;
3237 /* The effective initialization priority of a DECL. */
3239 #define DECL_EFFECTIVE_INIT_PRIORITY(decl) \
3240 ((!DECL_HAS_INIT_PRIORITY_P (decl) || DECL_INIT_PRIORITY (decl) == 0) \
3241 ? DEFAULT_INIT_PRIORITY : DECL_INIT_PRIORITY (decl))
3243 /* Whether a DECL needs a guard to protect it against multiple
3246 #define NEEDS_GUARD_P(decl) (TREE_PUBLIC (decl) && (DECL_COMMON (decl) \
3247 || DECL_ONE_ONLY (decl) \
3248 || DECL_WEAK (decl)))
3250 /* Called from one_static_initialization_or_destruction(),
3252 Walks the initializer list of a global variable and looks for
3253 temporary variables (DECL_NAME() == NULL and DECL_ARTIFICIAL != 0)
3254 and that have their DECL_CONTEXT() == NULL.
3255 For each such temporary variable, set their DECL_CONTEXT() to
3256 the current function. This is necessary because otherwise
3257 some optimizers (enabled by -O2 -fprofile-arcs) might crash
3258 when trying to refer to a temporary variable that does not have
3259 it's DECL_CONTECT() properly set. */
3261 fix_temporary_vars_context_r (tree
*node
,
3265 gcc_assert (current_function_decl
);
3267 if (TREE_CODE (*node
) == BIND_EXPR
)
3271 for (var
= BIND_EXPR_VARS (*node
); var
; var
= DECL_CHAIN (var
))
3272 if (TREE_CODE (var
) == VAR_DECL
3274 && DECL_ARTIFICIAL (var
)
3275 && !DECL_CONTEXT (var
))
3276 DECL_CONTEXT (var
) = current_function_decl
;
3282 /* Set up to handle the initialization or destruction of DECL. If
3283 INITP is nonzero, we are initializing the variable. Otherwise, we
3284 are destroying it. */
3287 one_static_initialization_or_destruction (tree decl
, tree init
, bool initp
)
3289 tree guard_if_stmt
= NULL_TREE
;
3292 /* If we are supposed to destruct and there's a trivial destructor,
3293 nothing has to be done. */
3295 && TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl
)))
3298 /* Trick the compiler into thinking we are at the file and line
3299 where DECL was declared so that error-messages make sense, and so
3300 that the debugger will show somewhat sensible file and line
3302 input_location
= DECL_SOURCE_LOCATION (decl
);
3304 /* Make sure temporary variables in the initialiser all have
3305 their DECL_CONTEXT() set to a value different from NULL_TREE.
3306 This can happen when global variables initialisers are built.
3307 In that case, the DECL_CONTEXT() of the global variables _AND_ of all
3308 the temporary variables that might have been generated in the
3309 accompagning initialisers is NULL_TREE, meaning the variables have been
3310 declared in the global namespace.
3311 What we want to do here is to fix that and make sure the DECL_CONTEXT()
3312 of the temporaries are set to the current function decl. */
3313 cp_walk_tree_without_duplicates (&init
,
3314 fix_temporary_vars_context_r
,
3321 Access control for implicit calls to the constructors,
3322 the conversion functions, or the destructor called to
3323 create and destroy a static data member is performed as
3324 if these calls appeared in the scope of the member's
3327 we pretend we are in a static member function of the class of
3328 which the DECL is a member. */
3329 if (member_p (decl
))
3331 DECL_CONTEXT (current_function_decl
) = DECL_CONTEXT (decl
);
3332 DECL_STATIC_FUNCTION_P (current_function_decl
) = 1;
3335 /* Assume we don't need a guard. */
3337 /* We need a guard if this is an object with external linkage that
3338 might be initialized in more than one place. (For example, a
3339 static data member of a template, when the data member requires
3341 if (NEEDS_GUARD_P (decl
))
3345 guard
= get_guard (decl
);
3347 /* When using __cxa_atexit, we just check the GUARD as we would
3348 for a local static. */
3349 if (flag_use_cxa_atexit
)
3351 /* When using __cxa_atexit, we never try to destroy
3352 anything from a static destructor. */
3354 guard_cond
= get_guard_cond (guard
);
3356 /* If we don't have __cxa_atexit, then we will be running
3357 destructors from .fini sections, or their equivalents. So,
3358 we need to know how many times we've tried to initialize this
3359 object. We do initializations only if the GUARD is zero,
3360 i.e., if we are the first to initialize the variable. We do
3361 destructions only if the GUARD is one, i.e., if we are the
3362 last to destroy the variable. */
3365 = cp_build_binary_op (input_location
,
3367 cp_build_unary_op (PREINCREMENT_EXPR
,
3370 tf_warning_or_error
),
3372 tf_warning_or_error
);
3375 = cp_build_binary_op (input_location
,
3377 cp_build_unary_op (PREDECREMENT_EXPR
,
3380 tf_warning_or_error
),
3382 tf_warning_or_error
);
3384 guard_if_stmt
= begin_if_stmt ();
3385 finish_if_stmt_cond (guard_cond
, guard_if_stmt
);
3389 /* If we're using __cxa_atexit, we have not already set the GUARD,
3390 so we must do so now. */
3391 if (guard
&& initp
&& flag_use_cxa_atexit
)
3392 finish_expr_stmt (set_guard (guard
));
3394 /* Perform the initialization or destruction. */
3398 finish_expr_stmt (init
);
3400 /* If we're using __cxa_atexit, register a function that calls the
3401 destructor for the object. */
3402 if (flag_use_cxa_atexit
)
3403 finish_expr_stmt (register_dtor_fn (decl
));
3406 finish_expr_stmt (build_cleanup (decl
));
3408 /* Finish the guard if-stmt, if necessary. */
3411 finish_then_clause (guard_if_stmt
);
3412 finish_if_stmt (guard_if_stmt
);
3415 /* Now that we're done with DECL we don't need to pretend to be a
3416 member of its class any longer. */
3417 DECL_CONTEXT (current_function_decl
) = NULL_TREE
;
3418 DECL_STATIC_FUNCTION_P (current_function_decl
) = 0;
3421 /* Generate code to do the initialization or destruction of the decls in VARS,
3422 a TREE_LIST of VAR_DECL with static storage duration.
3423 Whether initialization or destruction is performed is specified by INITP. */
3426 do_static_initialization_or_destruction (tree vars
, bool initp
)
3428 tree node
, init_if_stmt
, cond
;
3430 /* Build the outer if-stmt to check for initialization or destruction. */
3431 init_if_stmt
= begin_if_stmt ();
3432 cond
= initp
? integer_one_node
: integer_zero_node
;
3433 cond
= cp_build_binary_op (input_location
,
3437 tf_warning_or_error
);
3438 finish_if_stmt_cond (cond
, init_if_stmt
);
3442 tree decl
= TREE_VALUE (node
);
3443 tree priority_if_stmt
;
3447 /* If we don't need a destructor, there's nothing to do. Avoid
3448 creating a possibly empty if-stmt. */
3449 if (!initp
&& TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl
)))
3451 node
= TREE_CHAIN (node
);
3455 /* Remember that we had an initialization or finalization at this
3457 priority
= DECL_EFFECTIVE_INIT_PRIORITY (decl
);
3458 pi
= get_priority_info (priority
);
3460 pi
->initializations_p
= 1;
3462 pi
->destructions_p
= 1;
3464 /* Conditionalize this initialization on being in the right priority
3465 and being initializing/finalizing appropriately. */
3466 priority_if_stmt
= begin_if_stmt ();
3467 cond
= cp_build_binary_op (input_location
,
3470 build_int_cst (NULL_TREE
, priority
),
3471 tf_warning_or_error
);
3472 finish_if_stmt_cond (cond
, priority_if_stmt
);
3474 /* Process initializers with same priority. */
3476 && DECL_EFFECTIVE_INIT_PRIORITY (TREE_VALUE (node
)) == priority
;
3477 node
= TREE_CHAIN (node
))
3478 /* Do one initialization or destruction. */
3479 one_static_initialization_or_destruction (TREE_VALUE (node
),
3480 TREE_PURPOSE (node
), initp
);
3482 /* Finish up the priority if-stmt body. */
3483 finish_then_clause (priority_if_stmt
);
3484 finish_if_stmt (priority_if_stmt
);
3488 /* Finish up the init/destruct if-stmt body. */
3489 finish_then_clause (init_if_stmt
);
3490 finish_if_stmt (init_if_stmt
);
3493 /* VARS is a list of variables with static storage duration which may
3494 need initialization and/or finalization. Remove those variables
3495 that don't really need to be initialized or finalized, and return
3496 the resulting list. The order in which the variables appear in
3497 VARS is in reverse order of the order in which they should actually
3498 be initialized. The list we return is in the unreversed order;
3499 i.e., the first variable should be initialized first. */
3502 prune_vars_needing_no_initialization (tree
*vars
)
3505 tree result
= NULL_TREE
;
3510 tree decl
= TREE_VALUE (t
);
3511 tree init
= TREE_PURPOSE (t
);
3513 /* Deal gracefully with error. */
3514 if (decl
== error_mark_node
)
3516 var
= &TREE_CHAIN (t
);
3520 /* The only things that can be initialized are variables. */
3521 gcc_assert (TREE_CODE (decl
) == VAR_DECL
);
3523 /* If this object is not defined, we don't need to do anything
3525 if (DECL_EXTERNAL (decl
))
3527 var
= &TREE_CHAIN (t
);
3531 /* Also, if the initializer already contains errors, we can bail
3533 if (init
&& TREE_CODE (init
) == TREE_LIST
3534 && value_member (error_mark_node
, init
))
3536 var
= &TREE_CHAIN (t
);
3540 gcc_assert (!L_IPO_IS_AUXILIARY_MODULE
3541 || varpool_is_auxiliary (varpool_node_for_decl (decl
)));
3543 /* This variable is going to need initialization and/or
3544 finalization, so we add it to the list. */
3545 *var
= TREE_CHAIN (t
);
3546 TREE_CHAIN (t
) = result
;
3553 /* Make sure we have told the back end about all the variables in
3557 write_out_vars (tree vars
)
3561 for (v
= vars
; v
; v
= TREE_CHAIN (v
))
3563 tree var
= TREE_VALUE (v
);
3564 if (!var_finalized_p (var
))
3566 import_export_decl (var
);
3567 rest_of_decl_compilation (var
, 1, 1);
3572 /* Generate a static constructor (if CONSTRUCTOR_P) or destructor
3573 (otherwise) that will initialize all global objects with static
3574 storage duration having the indicated PRIORITY. */
3577 generate_ctor_or_dtor_function (bool constructor_p
, int priority
,
3585 input_location
= *locus
;
3587 /* Was: locus->line++; */
3589 /* We use `I' to indicate initialization and `D' to indicate
3591 function_key
= constructor_p
? 'I' : 'D';
3593 /* We emit the function lazily, to avoid generating empty
3594 global constructors and destructors. */
3597 /* For Objective-C++, we may need to initialize metadata found in this module.
3598 This must be done _before_ any other static initializations. */
3599 if (c_dialect_objc () && (priority
== DEFAULT_INIT_PRIORITY
)
3600 && constructor_p
&& objc_static_init_needed_p ())
3602 body
= start_objects (function_key
, priority
);
3603 objc_generate_static_init_call (NULL_TREE
);
3606 /* Call the static storage duration function with appropriate
3608 FOR_EACH_VEC_SAFE_ELT (ssdf_decls
, i
, fndecl
)
3610 /* Calls to pure or const functions will expand to nothing. */
3611 if (! (flags_from_decl_or_type (fndecl
) & (ECF_CONST
| ECF_PURE
)))
3616 body
= start_objects (function_key
, priority
);
3618 call
= cp_build_function_call_nary (fndecl
, tf_warning_or_error
,
3619 build_int_cst (NULL_TREE
,
3621 build_int_cst (NULL_TREE
,
3624 finish_expr_stmt (call
);
3628 /* Close out the function. */
3630 finish_objects (function_key
, priority
, body
);
3633 /* Generate constructor and destructor functions for the priority
3637 generate_ctor_and_dtor_functions_for_priority (splay_tree_node n
, void * data
)
3639 location_t
*locus
= (location_t
*) data
;
3640 int priority
= (int) n
->key
;
3641 priority_info pi
= (priority_info
) n
->value
;
3643 /* Generate the functions themselves, but only if they are really
3645 if (pi
->initializations_p
)
3646 generate_ctor_or_dtor_function (/*constructor_p=*/true, priority
, locus
);
3647 if (pi
->destructions_p
)
3648 generate_ctor_or_dtor_function (/*constructor_p=*/false, priority
, locus
);
3650 /* Keep iterating. */
3654 /* Java requires that we be able to reference a local address for a
3655 method, and not be confused by PLT entries. If hidden aliases are
3656 supported, collect and return all the functions for which we should
3657 emit a hidden alias. */
3659 static struct pointer_set_t
*
3660 collect_candidates_for_java_method_aliases (void)
3662 struct cgraph_node
*node
;
3663 struct pointer_set_t
*candidates
= NULL
;
3665 #ifndef HAVE_GAS_HIDDEN
3669 FOR_EACH_FUNCTION (node
)
3671 tree fndecl
= node
->symbol
.decl
;
3673 if (DECL_CONTEXT (fndecl
)
3674 && TYPE_P (DECL_CONTEXT (fndecl
))
3675 && TYPE_FOR_JAVA (DECL_CONTEXT (fndecl
))
3676 && TARGET_USE_LOCAL_THUNK_ALIAS_P (fndecl
))
3678 if (candidates
== NULL
)
3679 candidates
= pointer_set_create ();
3680 pointer_set_insert (candidates
, fndecl
);
3688 /* Java requires that we be able to reference a local address for a
3689 method, and not be confused by PLT entries. If hidden aliases are
3690 supported, emit one for each java function that we've emitted.
3691 CANDIDATES is the set of FUNCTION_DECLs that were gathered
3692 by collect_candidates_for_java_method_aliases. */
3695 build_java_method_aliases (struct pointer_set_t
*candidates
)
3697 struct cgraph_node
*node
;
3699 #ifndef HAVE_GAS_HIDDEN
3703 FOR_EACH_FUNCTION (node
)
3705 tree fndecl
= node
->symbol
.decl
;
3707 if (TREE_ASM_WRITTEN (fndecl
)
3708 && pointer_set_contains (candidates
, fndecl
))
3710 /* Mangle the name in a predictable way; we need to reference
3711 this from a java compiled object file. */
3712 tree oid
, nid
, alias
;
3716 oid
= DECL_ASSEMBLER_NAME (fndecl
);
3717 oname
= IDENTIFIER_POINTER (oid
);
3718 gcc_assert (oname
[0] == '_' && oname
[1] == 'Z');
3719 nname
= ACONCAT (("_ZGA", oname
+2, NULL
));
3720 nid
= get_identifier (nname
);
3722 alias
= make_alias_for (fndecl
, nid
);
3723 TREE_PUBLIC (alias
) = 1;
3724 DECL_VISIBILITY (alias
) = VISIBILITY_HIDDEN
;
3726 assemble_alias (alias
, oid
);
3731 /* Return C++ property of T, based on given operation OP. */
3734 cpp_check (tree t
, cpp_operation op
)
3739 return DECL_PURE_VIRTUAL_P (t
);
3740 case IS_CONSTRUCTOR
:
3741 return DECL_CONSTRUCTOR_P (t
);
3743 return DECL_DESTRUCTOR_P (t
);
3744 case IS_COPY_CONSTRUCTOR
:
3745 return DECL_COPY_CONSTRUCTOR_P (t
);
3747 return TREE_CODE (t
) == TEMPLATE_DECL
;
3753 /* Collect source file references recursively, starting from NAMESPC. */
3756 collect_source_refs (tree namespc
)
3763 /* Iterate over names in this name space. */
3764 for (t
= NAMESPACE_LEVEL (namespc
)->names
; t
; t
= TREE_CHAIN (t
))
3765 if (!DECL_IS_BUILTIN (t
) )
3766 collect_source_ref (DECL_SOURCE_FILE (t
));
3768 /* Dump siblings, if any */
3769 collect_source_refs (TREE_CHAIN (namespc
));
3771 /* Dump children, if any */
3772 collect_source_refs (NAMESPACE_LEVEL (namespc
)->namespaces
);
3775 /* Collect decls relevant to SOURCE_FILE from all namespaces recursively,
3776 starting from NAMESPC. */
3779 collect_ada_namespace (tree namespc
, const char *source_file
)
3784 /* Collect decls from this namespace */
3785 collect_ada_nodes (NAMESPACE_LEVEL (namespc
)->names
, source_file
);
3787 /* Collect siblings, if any */
3788 collect_ada_namespace (TREE_CHAIN (namespc
), source_file
);
3790 /* Collect children, if any */
3791 collect_ada_namespace (NAMESPACE_LEVEL (namespc
)->namespaces
, source_file
);
3794 /* Returns true iff there is a definition available for variable or
3798 decl_defined_p (tree decl
)
3800 if (TREE_CODE (decl
) == FUNCTION_DECL
)
3801 return (DECL_INITIAL (decl
) != NULL_TREE
);
3804 gcc_assert (TREE_CODE (decl
) == VAR_DECL
);
3805 return !DECL_EXTERNAL (decl
);
3809 /* Nonzero for a VAR_DECL whose value can be used in a constant expression.
3813 An integral constant-expression can only involve ... const
3814 variables of integral or enumeration types initialized with
3815 constant expressions ...
3817 C++0x also allows constexpr variables and temporaries initialized
3818 with constant expressions. We handle the former here, but the latter
3819 are just folded away in cxx_eval_constant_expression.
3821 The standard does not require that the expression be non-volatile.
3822 G++ implements the proposed correction in DR 457. */
3825 decl_constant_var_p (tree decl
)
3827 if (!decl_maybe_constant_var_p (decl
))
3830 /* We don't know if a template static data member is initialized with
3831 a constant expression until we instantiate its initializer. Even
3832 in the case of a constexpr variable, we can't treat it as a
3833 constant until its initializer is complete in case it's used in
3834 its own initializer. */
3836 return DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl
);
3839 /* Returns true if DECL could be a symbolic constant variable, depending on
3843 decl_maybe_constant_var_p (tree decl
)
3845 tree type
= TREE_TYPE (decl
);
3846 if (TREE_CODE (decl
) != VAR_DECL
)
3848 if (DECL_DECLARED_CONSTEXPR_P (decl
))
3850 return (CP_TYPE_CONST_NON_VOLATILE_P (type
)
3851 && INTEGRAL_OR_ENUMERATION_TYPE_P (type
));
3854 /* Complain that DECL uses a type with no linkage but is never defined. */
3857 no_linkage_error (tree decl
)
3859 tree t
= no_linkage_check (TREE_TYPE (decl
), /*relaxed_p=*/false);
3860 if (TYPE_ANONYMOUS_P (t
))
3862 permerror (0, "%q+#D, declared using anonymous type, "
3863 "is used but never defined", decl
);
3864 if (is_typedef_decl (TYPE_NAME (t
)))
3865 permerror (0, "%q+#D does not refer to the unqualified type, "
3866 "so it is not used for linkage", TYPE_NAME (t
));
3869 permerror (0, "%q+#D, declared using local type %qT, "
3870 "is used but never defined", decl
, t
);
3873 /* Clear the list of deferred functions. */
3875 cp_clear_deferred_fns (void)
3877 vec_free (deferred_fns
);
3878 keyed_classes
= NULL
;
3879 vec_free (no_linkage_decls
);
3880 no_linkage_decls
= NULL
;
3881 cp_clear_constexpr_hashtable ();
3884 /* Collect declarations from all namespaces relevant to SOURCE_FILE. */
3887 collect_all_refs (const char *source_file
)
3889 collect_ada_namespace (global_namespace
, source_file
);
3892 /* Clear DECL_EXTERNAL for NODE. */
3895 clear_decl_external (struct cgraph_node
*node
, void * /*data*/)
3897 DECL_EXTERNAL (node
->symbol
.decl
) = 0;
3901 /* Build up the function to run dynamic initializers for thread_local
3902 variables in this translation unit and alias the init functions for the
3903 individual variables to it. */
3906 handle_tls_init (void)
3908 tree vars
= prune_vars_needing_no_initialization (&tls_aggregates
);
3909 if (vars
== NULL_TREE
)
3912 location_t loc
= DECL_SOURCE_LOCATION (TREE_VALUE (vars
));
3914 write_out_vars (vars
);
3916 tree guard
= build_decl (loc
, VAR_DECL
, get_identifier ("__tls_guard"),
3918 TREE_PUBLIC (guard
) = false;
3919 TREE_STATIC (guard
) = true;
3920 DECL_ARTIFICIAL (guard
) = true;
3921 DECL_IGNORED_P (guard
) = true;
3922 TREE_USED (guard
) = true;
3923 DECL_TLS_MODEL (guard
) = decl_default_tls_model (guard
);
3924 pushdecl_top_level_and_finish (guard
, NULL_TREE
);
3926 tree fn
= get_local_tls_init_fn ();
3927 start_preparsed_function (fn
, NULL_TREE
, SF_PRE_PARSED
);
3928 tree body
= begin_function_body ();
3929 tree if_stmt
= begin_if_stmt ();
3930 tree cond
= cp_build_unary_op (TRUTH_NOT_EXPR
, guard
, false,
3931 tf_warning_or_error
);
3932 finish_if_stmt_cond (cond
, if_stmt
);
3933 finish_expr_stmt (cp_build_modify_expr (guard
, NOP_EXPR
, boolean_true_node
,
3934 tf_warning_or_error
));
3935 for (; vars
; vars
= TREE_CHAIN (vars
))
3937 tree var
= TREE_VALUE (vars
);
3938 tree init
= TREE_PURPOSE (vars
);
3939 one_static_initialization_or_destruction (var
, init
, true);
3941 #ifdef ASM_OUTPUT_DEF
3942 /* Output init aliases even with -fno-extern-tls-init. */
3943 if (TREE_PUBLIC (var
))
3945 tree single_init_fn
= get_tls_init_fn (var
);
3947 = cgraph_same_body_alias (cgraph_get_create_node (fn
),
3948 single_init_fn
, fn
);
3949 gcc_assert (alias
!= NULL
);
3954 finish_then_clause (if_stmt
);
3955 finish_if_stmt (if_stmt
);
3956 finish_function_body (body
);
3957 expand_or_defer_fn (finish_function (0));
3960 /* This routine is called at the end of compilation.
3961 Its job is to create all the code needed to initialize and
3962 destroy the global aggregates. We do the destruction
3963 first, since that way we only need to reverse the decls once. */
3966 cp_process_pending_declarations (location_t locus
)
3971 unsigned ssdf_count
= 0;
3974 timevar_start (TV_PHASE_DEFERRED
);
3983 /* If there are templates that we've put off instantiating, do
3985 instantiate_pending_templates (retries
);
3988 /* Write out virtual tables as required. Note that writing out
3989 the virtual table for a template class may cause the
3990 instantiation of members of that class. If we write out
3991 vtables then we remove the class from our list so we don't
3992 have to look at it again. */
3994 while (keyed_classes
!= NULL_TREE
3995 && maybe_emit_vtables (TREE_VALUE (keyed_classes
)))
3998 keyed_classes
= TREE_CHAIN (keyed_classes
);
4004 tree next
= TREE_CHAIN (t
);
4008 if (maybe_emit_vtables (TREE_VALUE (next
)))
4011 TREE_CHAIN (t
) = TREE_CHAIN (next
);
4016 next
= TREE_CHAIN (t
);
4020 /* Write out needed type info variables. We have to be careful
4021 looping through unemitted decls, because emit_tinfo_decl may
4022 cause other variables to be needed. New elements will be
4023 appended, and we remove from the vector those that actually
4025 for (i
= unemitted_tinfo_decls
->length ();
4026 unemitted_tinfo_decls
->iterate (--i
, &t
);)
4027 if (emit_tinfo_decl (t
))
4030 unemitted_tinfo_decls
->unordered_remove (i
);
4033 /* The list of objects with static storage duration is built up
4034 in reverse order. We clear STATIC_AGGREGATES so that any new
4035 aggregates added during the initialization of these will be
4036 initialized in the correct order when we next come around the
4038 vars
= prune_vars_needing_no_initialization (&static_aggregates
);
4042 /* We need to start a new initialization function each time
4043 through the loop. That's because we need to know which
4044 vtables have been referenced, and TREE_SYMBOL_REFERENCED
4045 isn't computed until a function is finished, and written
4046 out. That's a deficiency in the back end. When this is
4047 fixed, these initialization functions could all become
4048 inline, with resulting performance improvements. */
4051 /* Set the line and file, so that it is obviously not from
4053 input_location
= locus
;
4054 ssdf_body
= start_static_storage_duration_function (ssdf_count
);
4056 /* Make sure the back end knows about all the variables. */
4057 write_out_vars (vars
);
4059 /* First generate code to do all the initializations. */
4061 do_static_initialization_or_destruction (vars
, /*initp=*/true);
4063 /* Then, generate code to do all the destructions. Do these
4064 in reverse order so that the most recently constructed
4065 variable is the first destroyed. If we're using
4066 __cxa_atexit, then we don't need to do this; functions
4067 were registered at initialization time to destroy the
4069 if (!flag_use_cxa_atexit
&& vars
)
4071 vars
= nreverse (vars
);
4072 do_static_initialization_or_destruction (vars
, /*initp=*/false);
4077 /* Finish up the static storage duration function for this
4079 input_location
= locus
;
4080 finish_static_storage_duration_function (ssdf_body
);
4082 /* All those initializations and finalizations might cause
4083 us to need more inline functions, more template
4084 instantiations, etc. */
4087 /* ??? was: locus.line++; */
4090 /* Now do the same for thread_local variables. */
4093 /* Go through the set of inline functions whose bodies have not
4094 been emitted yet. If out-of-line copies of these functions
4095 are required, emit them. */
4096 FOR_EACH_VEC_SAFE_ELT (deferred_fns
, i
, decl
)
4098 /* Does it need synthesizing? */
4099 if (DECL_DEFAULTED_FN (decl
) && ! DECL_INITIAL (decl
)
4100 && (! DECL_REALLY_EXTERN (decl
) || possibly_inlined_p (decl
)))
4102 /* Even though we're already at the top-level, we push
4103 there again. That way, when we pop back a few lines
4104 hence, all of our state is restored. Otherwise,
4105 finish_function doesn't clean things up, and we end
4106 up with CURRENT_FUNCTION_DECL set. */
4107 push_to_top_level ();
4108 /* The decl's location will mark where it was first
4109 needed. Save that so synthesize method can indicate
4110 where it was needed from, in case of error */
4111 input_location
= DECL_SOURCE_LOCATION (decl
);
4112 synthesize_method (decl
);
4113 pop_from_top_level ();
4117 if (!DECL_INITIAL (decl
) && decl_tls_wrapper_p (decl
))
4118 generate_tls_wrapper (decl
);
4120 if (!DECL_SAVED_TREE (decl
))
4123 /* We lie to the back end, pretending that some functions
4124 are not defined when they really are. This keeps these
4125 functions from being put out unnecessarily. But, we must
4126 stop lying when the functions are referenced, or if they
4127 are not comdat since they need to be put out now. If
4128 DECL_INTERFACE_KNOWN, then we have already set
4129 DECL_EXTERNAL appropriately, so there's no need to check
4130 again, and we do not want to clear DECL_EXTERNAL if a
4131 previous call to import_export_decl set it.
4133 This is done in a separate for cycle, because if some
4134 deferred function is contained in another deferred
4135 function later in deferred_fns varray,
4136 rest_of_compilation would skip this function and we
4137 really cannot expand the same function twice. */
4138 import_export_decl (decl
);
4139 if (DECL_NOT_REALLY_EXTERN (decl
)
4140 && DECL_INITIAL (decl
)
4141 && decl_needed_p (decl
))
4143 struct cgraph_node
*node
, *next
;
4145 node
= cgraph_get_node (decl
);
4146 if (node
->same_body_alias
)
4147 node
= cgraph_alias_aliased_node (node
);
4149 cgraph_for_node_and_aliases (node
, clear_decl_external
,
4151 /* If we mark !DECL_EXTERNAL one of the symbols in some comdat
4152 group, we need to mark all symbols in the same comdat group
4154 if (node
->symbol
.same_comdat_group
)
4155 for (next
= cgraph (node
->symbol
.same_comdat_group
);
4157 next
= cgraph (next
->symbol
.same_comdat_group
))
4158 cgraph_for_node_and_aliases (next
, clear_decl_external
,
4162 /* If we're going to need to write this function out, and
4163 there's already a body for it, create RTL for it now.
4164 (There might be no body if this is a method we haven't
4165 gotten around to synthesizing yet.) */
4166 if (!DECL_EXTERNAL (decl
)
4167 && decl_needed_p (decl
)
4168 && !TREE_ASM_WRITTEN (decl
)
4169 && !cgraph_get_create_node (decl
)->local
.finalized
)
4171 /* We will output the function; no longer consider it in this
4173 DECL_DEFER_OUTPUT (decl
) = 0;
4174 /* Generate RTL for this function now that we know we
4176 expand_or_defer_fn (decl
);
4177 /* If we're compiling -fsyntax-only pretend that this
4178 function has been written out so that we don't try to
4180 if (flag_syntax_only
)
4181 TREE_ASM_WRITTEN (decl
) = 1;
4186 if (walk_namespaces (wrapup_globals_for_namespace
, /*data=*/0))
4189 /* Static data members are just like namespace-scope globals. */
4190 FOR_EACH_VEC_SAFE_ELT (pending_statics
, i
, decl
)
4192 if (var_finalized_p (decl
) || DECL_REALLY_EXTERN (decl
)
4193 /* Don't write it out if we haven't seen a definition. */
4194 || DECL_IN_AGGR_P (decl
))
4196 import_export_decl (decl
);
4197 /* If this static data member is needed, provide it to the
4199 if (DECL_NOT_REALLY_EXTERN (decl
) && decl_needed_p (decl
))
4200 DECL_EXTERNAL (decl
) = 0;
4202 if (vec_safe_length (pending_statics
) != 0
4203 && wrapup_global_declarations (pending_statics
->address (),
4204 pending_statics
->length ()))
4211 if (L_IPO_IS_AUXILIARY_MODULE
)
4213 gcc_assert (flag_dyn_ipa
&& L_IPO_COMP_MODE
);
4215 /* Do some cleanup -- we do not really need static init function
4216 to be created for auxiliary modules -- they are created to keep
4217 funcdef_no consistent between profile use and profile gen. */
4219 for (i
= 0; ssdf_decls
->iterator (i
, fndecl
); ++i
)
4220 /* Such ssdf_decls are not called from GLOBAL ctor/dtor, mark
4221 them reachable to avoid being eliminated too early before
4223 cgraph_mark_reachable_node (cgraph_get_create_node (fndecl
));
4226 timevar_stop (TV_PHASE_DEFERRED
);
4230 /* All used inline functions must have a definition at this point. */
4231 FOR_EACH_VEC_SAFE_ELT (deferred_fns
, i
, decl
)
4233 if (/* Check online inline functions that were actually used. */
4234 DECL_ODR_USED (decl
) && DECL_DECLARED_INLINE_P (decl
)
4235 /* If the definition actually was available here, then the
4236 fact that the function was not defined merely represents
4237 that for some reason (use of a template repository,
4238 #pragma interface, etc.) we decided not to emit the
4240 && !DECL_INITIAL (decl
)
4241 /* Don't complain if the template was defined. */
4242 && !(DECL_TEMPLATE_INSTANTIATION (decl
)
4243 && DECL_INITIAL (DECL_TEMPLATE_RESULT
4244 (template_for_substitution (decl
)))))
4246 warning (0, "inline function %q+D used but never defined", decl
);
4247 /* Avoid a duplicate warning from check_global_declaration_1. */
4248 TREE_NO_WARNING (decl
) = 1;
4252 /* So must decls that use a type with no linkage. */
4253 FOR_EACH_VEC_SAFE_ELT (no_linkage_decls
, i
, decl
)
4254 if (!decl_defined_p (decl
))
4255 no_linkage_error (decl
);
4257 /* Then, do the Objective-C stuff. This is where all the
4258 Objective-C module stuff gets generated (symtab,
4259 class/protocol/selector lists etc). This must be done after C++
4260 templates, destructors etc. so that selectors used in C++
4261 templates are properly allocated. */
4262 if (c_dialect_objc ())
4263 objc_write_global_declarations ();
4265 /* We give C linkage to static constructors and destructors. */
4266 push_lang_context (lang_name_c
);
4268 /* Generate initialization and destruction functions for all
4269 priorities for which they are required. */
4270 if (priority_info_map
)
4271 splay_tree_foreach (priority_info_map
,
4272 generate_ctor_and_dtor_functions_for_priority
,
4274 else if (c_dialect_objc () && objc_static_init_needed_p ())
4275 /* If this is obj-c++ and we need a static init, call
4276 generate_ctor_or_dtor_function. */
4277 generate_ctor_or_dtor_function (/*constructor_p=*/true,
4278 DEFAULT_INIT_PRIORITY
, &locus
);
4280 /* We're done with the splay-tree now. */
4281 if (priority_info_map
)
4283 splay_tree_delete (priority_info_map
);
4284 priority_info_map
= NULL
;
4287 /* Generate any missing aliases. */
4288 maybe_apply_pending_pragma_weaks ();
4290 /* We're done with static constructors, so we can go back to "C++"
4292 pop_lang_context ();
4295 timevar_stop (TV_PHASE_DEFERRED
);
4298 /* This routine is called at the end of compilation.
4299 Its job is to create all the code needed to initialize and
4300 destroy the global aggregates. We do the destruction
4301 first, since that way we only need to reverse the decls once. */
4304 cp_write_global_declarations (void)
4306 bool reconsider
= false;
4308 struct pointer_set_t
*candidates
;
4310 locus
= input_location
;
4313 /* Bad parse errors. Just forget about it. */
4314 if (! global_bindings_p () || current_class_type
4315 || !vec_safe_is_empty (decl_namespace_list
))
4320 c_common_write_pch ();
4324 cgraph_process_same_body_aliases ();
4326 /* Handle -fdump-ada-spec[-slim] */
4327 if (flag_dump_ada_spec
|| flag_dump_ada_spec_slim
)
4329 if (flag_dump_ada_spec_slim
)
4330 collect_source_ref (main_input_filename
);
4332 collect_source_refs (global_namespace
);
4334 dump_ada_specs (collect_all_refs
, cpp_check
);
4337 /* FIXME - huh? was input_line -= 1;*/
4339 /* We now have to write out all the stuff we put off writing out.
4342 o Template specializations that we have not yet instantiated,
4343 but which are needed.
4344 o Initialization and destruction for non-local objects with
4345 static storage duration. (Local objects with static storage
4346 duration are initialized when their scope is first entered,
4347 and are cleaned up via atexit.)
4348 o Virtual function tables.
4350 All of these may cause others to be needed. For example,
4351 instantiating one function may cause another to be needed, and
4352 generating the initializer for an object may cause templates to be
4353 instantiated, etc., etc. */
4355 timevar_push (TV_VARCONST
);
4357 emit_support_tinfos ();
4359 if (!L_IPO_COMP_MODE
)
4360 cp_process_pending_declarations (locus
);
4362 /* Collect candidates for Java hidden aliases. */
4363 candidates
= collect_candidates_for_java_method_aliases ();
4366 timevar_start (TV_PHASE_OPT_GEN
);
4368 finalize_compilation_unit ();
4370 timevar_stop (TV_PHASE_OPT_GEN
);
4371 timevar_start (TV_PHASE_CHECK_DBGINFO
);
4373 /* Now, issue warnings about static, but not defined, functions,
4374 etc., and emit debugging information. */
4375 walk_namespaces (wrapup_globals_for_namespace
, /*data=*/&reconsider
);
4376 if (vec_safe_length (pending_statics
) != 0)
4378 check_global_declarations (pending_statics
->address (),
4379 pending_statics
->length ());
4380 emit_debug_global_declarations (pending_statics
->address (),
4381 pending_statics
->length ());
4384 perform_deferred_noexcept_checks ();
4386 /* Generate hidden aliases for Java. */
4389 build_java_method_aliases (candidates
);
4390 pointer_set_destroy (candidates
);
4395 /* The entire file is now complete. If requested, dump everything
4399 FILE *stream
= dump_begin (TDI_tu
, &flags
);
4403 dump_node (global_namespace
, flags
& ~TDF_SLIM
, stream
);
4404 dump_end (TDI_tu
, stream
);
4408 if (flag_detailed_statistics
)
4410 dump_tree_statistics ();
4411 dump_time_statistics ();
4413 input_location
= locus
;
4415 #ifdef ENABLE_CHECKING
4416 validate_conversion_obstack ();
4417 #endif /* ENABLE_CHECKING */
4419 timevar_stop (TV_PHASE_CHECK_DBGINFO
);
4422 /* FN is an OFFSET_REF, DOTSTAR_EXPR or MEMBER_REF indicating the
4423 function to call in parse-tree form; it has not yet been
4424 semantically analyzed. ARGS are the arguments to the function.
4425 They have already been semantically analyzed. This may change
4429 build_offset_ref_call_from_tree (tree fn
, vec
<tree
, va_gc
> **args
,
4430 tsubst_flags_t complain
)
4433 vec
<tree
, va_gc
> *orig_args
= NULL
;
4438 object
= TREE_OPERAND (fn
, 0);
4440 if (processing_template_decl
)
4442 gcc_assert (TREE_CODE (fn
) == DOTSTAR_EXPR
4443 || TREE_CODE (fn
) == MEMBER_REF
);
4444 if (type_dependent_expression_p (fn
)
4445 || any_type_dependent_arguments_p (*args
))
4446 return build_nt_call_vec (fn
, *args
);
4448 orig_args
= make_tree_vector_copy (*args
);
4450 /* Transform the arguments and add the implicit "this"
4451 parameter. That must be done before the FN is transformed
4452 because we depend on the form of FN. */
4453 make_args_non_dependent (*args
);
4454 object
= build_non_dependent_expr (object
);
4455 if (TREE_CODE (TREE_TYPE (fn
)) == METHOD_TYPE
)
4457 if (TREE_CODE (fn
) == DOTSTAR_EXPR
)
4458 object
= cp_build_addr_expr (object
, complain
);
4459 vec_safe_insert (*args
, 0, object
);
4461 /* Now that the arguments are done, transform FN. */
4462 fn
= build_non_dependent_expr (fn
);
4465 /* A qualified name corresponding to a bound pointer-to-member is
4466 represented as an OFFSET_REF:
4468 struct B { void g(); };
4470 void B::g() { (this->*p)(); } */
4471 if (TREE_CODE (fn
) == OFFSET_REF
)
4473 tree object_addr
= cp_build_addr_expr (object
, complain
);
4474 fn
= TREE_OPERAND (fn
, 1);
4475 fn
= get_member_function_from_ptrfunc (&object_addr
, fn
,
4477 vec_safe_insert (*args
, 0, object_addr
);
4480 if (CLASS_TYPE_P (TREE_TYPE (fn
)))
4481 expr
= build_op_call (fn
, args
, complain
);
4483 expr
= cp_build_function_call_vec (fn
, args
, complain
);
4484 if (processing_template_decl
&& expr
!= error_mark_node
)
4485 expr
= build_min_non_dep_call_vec (expr
, orig_fn
, orig_args
);
4487 if (orig_args
!= NULL
)
4488 release_tree_vector (orig_args
);
4495 check_default_args (tree x
)
4497 tree arg
= TYPE_ARG_TYPES (TREE_TYPE (x
));
4498 bool saw_def
= false;
4499 int i
= 0 - (TREE_CODE (TREE_TYPE (x
)) == METHOD_TYPE
);
4500 for (; arg
&& arg
!= void_list_node
; arg
= TREE_CHAIN (arg
), ++i
)
4502 if (TREE_PURPOSE (arg
))
4506 error ("default argument missing for parameter %P of %q+#D", i
, x
);
4507 TREE_PURPOSE (arg
) = error_mark_node
;
4512 /* Return true if function DECL can be inlined. This is used to force
4513 instantiation of methods that might be interesting for inlining. */
4515 possibly_inlined_p (tree decl
)
4517 gcc_assert (TREE_CODE (decl
) == FUNCTION_DECL
);
4518 if (DECL_UNINLINABLE (decl
))
4520 if (!optimize
|| pragma_java_exceptions
)
4521 return DECL_DECLARED_INLINE_P (decl
);
4522 /* When optimizing, we might inline everything when flatten
4523 attribute or heuristics inlining for size or autoinlining
4528 /* Mark DECL (either a _DECL or a BASELINK) as "used" in the program.
4529 If DECL is a specialization or implicitly declared class member,
4530 generate the actual definition. Return false if something goes
4531 wrong, true otherwise. */
4534 mark_used (tree decl
)
4536 /* If DECL is a BASELINK for a single function, then treat it just
4537 like the DECL for the function. Otherwise, if the BASELINK is
4538 for an overloaded function, we don't know which function was
4539 actually used until after overload resolution. */
4540 if (BASELINK_P (decl
))
4542 decl
= BASELINK_FUNCTIONS (decl
);
4543 if (really_overloaded_fn (decl
))
4545 decl
= OVL_CURRENT (decl
);
4548 /* Set TREE_USED for the benefit of -Wunused. */
4549 TREE_USED (decl
) = 1;
4550 if (DECL_CLONED_FUNCTION_P (decl
))
4551 TREE_USED (DECL_CLONED_FUNCTION (decl
)) = 1;
4553 /* Mark enumeration types as used. */
4554 if (TREE_CODE (decl
) == CONST_DECL
)
4555 used_types_insert (DECL_CONTEXT (decl
));
4557 if (TREE_CODE (decl
) == FUNCTION_DECL
4558 && DECL_DELETED_FN (decl
))
4560 if (DECL_ARTIFICIAL (decl
))
4562 if (DECL_OVERLOADED_OPERATOR_P (decl
) == TYPE_EXPR
4563 && LAMBDA_TYPE_P (DECL_CONTEXT (decl
)))
4565 /* We mark a lambda conversion op as deleted if we can't
4566 generate it properly; see maybe_add_lambda_conv_op. */
4567 sorry ("converting lambda which uses %<...%> to "
4568 "function pointer");
4572 error ("use of deleted function %qD", decl
);
4573 if (!maybe_explain_implicit_delete (decl
))
4574 error_at (DECL_SOURCE_LOCATION (decl
), "declared here");
4578 /* We can only check DECL_ODR_USED on variables or functions with
4579 DECL_LANG_SPECIFIC set, and these are also the only decls that we
4580 might need special handling for. */
4581 if ((TREE_CODE (decl
) != VAR_DECL
&& TREE_CODE (decl
) != FUNCTION_DECL
)
4582 || DECL_LANG_SPECIFIC (decl
) == NULL
4583 || DECL_THUNK_P (decl
))
4585 if (!processing_template_decl
&& type_uses_auto (TREE_TYPE (decl
)))
4587 error ("use of %qD before deduction of %<auto%>", decl
);
4593 /* We only want to do this processing once. We don't need to keep trying
4594 to instantiate inline templates, because unit-at-a-time will make sure
4595 we get them compiled before functions that want to inline them. */
4596 if (DECL_ODR_USED (decl
))
4599 /* If within finish_function, defer the rest until that function
4600 finishes, otherwise it might recurse. */
4601 if (defer_mark_used_calls
)
4603 vec_safe_push (deferred_mark_used_calls
, decl
);
4607 if (TREE_CODE (decl
) == FUNCTION_DECL
)
4608 maybe_instantiate_noexcept (decl
);
4610 /* Normally, we can wait until instantiation-time to synthesize DECL.
4611 However, if DECL is a static data member initialized with a constant
4612 or a constexpr function, we need it right now because a reference to
4613 such a data member or a call to such function is not value-dependent.
4614 For a function that uses auto in the return type, we need to instantiate
4615 it to find out its type. */
4616 if ((decl_maybe_constant_var_p (decl
)
4617 || (TREE_CODE (decl
) == FUNCTION_DECL
4618 && DECL_DECLARED_CONSTEXPR_P (decl
))
4619 || type_uses_auto (TREE_TYPE (decl
)))
4620 && DECL_LANG_SPECIFIC (decl
)
4621 && DECL_TEMPLATE_INFO (decl
)
4622 && !uses_template_parms (DECL_TI_ARGS (decl
)))
4624 /* Instantiating a function will result in garbage collection. We
4625 must treat this situation as if we were within the body of a
4626 function so as to avoid collecting live data only referenced from
4627 the stack (such as overload resolution candidates). */
4629 instantiate_decl (decl
, /*defer_ok=*/false,
4630 /*expl_inst_class_mem_p=*/false);
4634 if (processing_template_decl
)
4637 /* Check this too in case we're within fold_non_dependent_expr. */
4638 if (DECL_TEMPLATE_INFO (decl
)
4639 && uses_template_parms (DECL_TI_ARGS (decl
)))
4642 if (type_uses_auto (TREE_TYPE (decl
)))
4644 error ("use of %qD before deduction of %<auto%>", decl
);
4648 /* If we don't need a value, then we don't need to synthesize DECL. */
4649 if (cp_unevaluated_operand
!= 0)
4652 DECL_ODR_USED (decl
) = 1;
4653 if (DECL_CLONED_FUNCTION_P (decl
))
4654 DECL_ODR_USED (DECL_CLONED_FUNCTION (decl
)) = 1;
4656 /* DR 757: A type without linkage shall not be used as the type of a
4657 variable or function with linkage, unless
4658 o the variable or function has extern "C" linkage (7.5 [dcl.link]), or
4659 o the variable or function is not used (3.2 [basic.def.odr]) or is
4660 defined in the same translation unit. */
4661 if (cxx_dialect
> cxx98
4662 && decl_linkage (decl
) != lk_none
4663 && !DECL_EXTERN_C_P (decl
)
4664 && !DECL_ARTIFICIAL (decl
)
4665 && !decl_defined_p (decl
)
4666 && no_linkage_check (TREE_TYPE (decl
), /*relaxed_p=*/false))
4668 if (is_local_extern (decl
))
4669 /* There's no way to define a local extern, and adding it to
4670 the vector interferes with GC, so give an error now. */
4671 no_linkage_error (decl
);
4673 vec_safe_push (no_linkage_decls
, decl
);
4676 if (TREE_CODE (decl
) == FUNCTION_DECL
&& DECL_DECLARED_INLINE_P (decl
)
4677 && !DECL_INITIAL (decl
) && !DECL_ARTIFICIAL (decl
))
4678 /* Remember it, so we can check it was defined. */
4679 note_vague_linkage_fn (decl
);
4681 /* Is it a synthesized method that needs to be synthesized? */
4682 if (TREE_CODE (decl
) == FUNCTION_DECL
4683 && DECL_NONSTATIC_MEMBER_FUNCTION_P (decl
)
4684 && DECL_DEFAULTED_FN (decl
)
4685 /* A function defaulted outside the class is synthesized either by
4686 cp_finish_decl or instantiate_decl. */
4687 && !DECL_DEFAULTED_OUTSIDE_CLASS_P (decl
)
4688 && ! DECL_INITIAL (decl
))
4690 /* Defer virtual destructors so that thunks get the right
4692 if (DECL_VIRTUAL_P (decl
) && !at_eof
)
4694 note_vague_linkage_fn (decl
);
4698 /* Remember the current location for a function we will end up
4699 synthesizing. Then we can inform the user where it was
4700 required in the case of error. */
4701 DECL_SOURCE_LOCATION (decl
) = input_location
;
4703 /* Synthesizing an implicitly defined member function will result in
4704 garbage collection. We must treat this situation as if we were
4705 within the body of a function so as to avoid collecting live data
4706 on the stack (such as overload resolution candidates).
4708 We could just let cp_write_global_declarations handle synthesizing
4709 this function by adding it to deferred_fns, but doing
4710 it at the use site produces better error messages. */
4712 synthesize_method (decl
);
4714 /* If this is a synthesized method we don't need to
4715 do the instantiation test below. */
4717 else if ((TREE_CODE (decl
) == FUNCTION_DECL
|| TREE_CODE (decl
) == VAR_DECL
)
4718 && DECL_TEMPLATE_INFO (decl
)
4719 && (!DECL_EXPLICIT_INSTANTIATION (decl
)
4720 || always_instantiate_p (decl
)))
4721 /* If this is a function or variable that is an instance of some
4722 template, we now know that we will need to actually do the
4723 instantiation. We check that DECL is not an explicit
4724 instantiation because that is not checked in instantiate_decl.
4726 We put off instantiating functions in order to improve compile
4727 times. Maintaining a stack of active functions is expensive,
4728 and the inliner knows to instantiate any functions it might
4729 need. Therefore, we always try to defer instantiation. */
4732 instantiate_decl (decl
, /*defer_ok=*/true,
4733 /*expl_inst_class_mem_p=*/false);
4740 #include "gt-cp-decl2.h"