1 /* Process declarations and variables for C++ compiler.
2 Copyright (C) 1988, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
3 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2007, 2008, 2009
4 Free Software Foundation, Inc.
5 Hacked by Michael Tiemann (tiemann@cygnus.com)
7 This file is part of GCC.
9 GCC is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 3, or (at your option)
14 GCC is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
19 You should have received a copy of the GNU General Public License
20 along with GCC; see the file COPYING3. If not see
21 <http://www.gnu.org/licenses/>. */
24 /* Process declarations and symbol lookup for C++ front end.
25 Also constructs types; the standard scalar types at initialization,
26 and structure, union, array and enum types when they are declared. */
28 /* ??? not all decl nodes are given the most useful possible
29 line numbers. For example, the CONST_DECLs for enum values. */
33 #include "coretypes.h"
48 #include "tree-mudflap.h"
50 #include "tree-inline.h"
52 #include "tree-dump.h"
56 extern cpp_reader
*parse_in
;
58 /* This structure contains information about the initializations
59 and/or destructions required for a particular priority level. */
60 typedef struct priority_info_s
{
61 /* Nonzero if there have been any initializations at this priority
62 throughout the translation unit. */
63 int initializations_p
;
64 /* Nonzero if there have been any destructions at this priority
65 throughout the translation unit. */
69 static void mark_vtable_entries (tree
);
70 static bool maybe_emit_vtables (tree
);
71 static bool acceptable_java_type (tree
);
72 static tree
start_objects (int, int);
73 static void finish_objects (int, int, tree
);
74 static tree
start_static_storage_duration_function (unsigned);
75 static void finish_static_storage_duration_function (tree
);
76 static priority_info
get_priority_info (int);
77 static void do_static_initialization_or_destruction (tree
, bool);
78 static void one_static_initialization_or_destruction (tree
, tree
, bool);
79 static void generate_ctor_or_dtor_function (bool, int, location_t
*);
80 static int generate_ctor_and_dtor_functions_for_priority (splay_tree_node
,
82 static tree
prune_vars_needing_no_initialization (tree
*);
83 static void write_out_vars (tree
);
84 static void import_export_class (tree
);
85 static tree
get_guard_bits (tree
);
86 static void determine_visibility_from_class (tree
, 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
,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
,gc
) *deferred_fns
;
97 /* Nonzero if we're done parsing and into end-of-file activities. */
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
)
113 if (fntype
== error_mark_node
|| ctype
== error_mark_node
)
114 return error_mark_node
;
116 type_quals
= quals
& ~TYPE_QUAL_RESTRICT
;
117 ctype
= cp_build_qualified_type (ctype
, type_quals
);
118 fntype
= build_method_type_directly (ctype
, TREE_TYPE (fntype
),
119 (TREE_CODE (fntype
) == METHOD_TYPE
120 ? TREE_CHAIN (TYPE_ARG_TYPES (fntype
))
121 : TYPE_ARG_TYPES (fntype
)));
122 raises
= TYPE_RAISES_EXCEPTIONS (fntype
);
124 fntype
= build_exception_variant (fntype
, raises
);
129 /* Build a PARM_DECL with NAME and TYPE, and set DECL_ARG_TYPE
133 cp_build_parm_decl (tree name
, tree type
)
135 tree parm
= build_decl (PARM_DECL
, name
, type
);
136 /* DECL_ARG_TYPE is only used by the back end and the back end never
138 if (!processing_template_decl
)
139 DECL_ARG_TYPE (parm
) = type_passed_as (type
);
141 /* If the type is a pack expansion, then we have a function
143 if (type
&& TREE_CODE (type
) == TYPE_PACK_EXPANSION
)
144 FUNCTION_PARAMETER_PACK_P (parm
) = 1;
149 /* Returns a PARM_DECL for a parameter of the indicated TYPE, with the
153 build_artificial_parm (tree name
, tree type
)
155 tree parm
= cp_build_parm_decl (name
, type
);
156 DECL_ARTIFICIAL (parm
) = 1;
157 /* All our artificial parms are implicitly `const'; they cannot be
159 TREE_READONLY (parm
) = 1;
163 /* Constructors for types with virtual baseclasses need an "in-charge" flag
164 saying whether this constructor is responsible for initialization of
165 virtual baseclasses or not. All destructors also need this "in-charge"
166 flag, which additionally determines whether or not the destructor should
167 free the memory for the object.
169 This function adds the "in-charge" flag to member function FN if
170 appropriate. It is called from grokclassfn and tsubst.
171 FN must be either a constructor or destructor.
173 The in-charge flag follows the 'this' parameter, and is followed by the
174 VTT parm (if any), then the user-written parms. */
177 maybe_retrofit_in_chrg (tree fn
)
179 tree basetype
, arg_types
, parms
, parm
, fntype
;
181 /* If we've already add the in-charge parameter don't do it again. */
182 if (DECL_HAS_IN_CHARGE_PARM_P (fn
))
185 /* When processing templates we can't know, in general, whether or
186 not we're going to have virtual baseclasses. */
187 if (processing_template_decl
)
190 /* We don't need an in-charge parameter for constructors that don't
191 have virtual bases. */
192 if (DECL_CONSTRUCTOR_P (fn
)
193 && !CLASSTYPE_VBASECLASSES (DECL_CONTEXT (fn
)))
196 arg_types
= TYPE_ARG_TYPES (TREE_TYPE (fn
));
197 basetype
= TREE_TYPE (TREE_VALUE (arg_types
));
198 arg_types
= TREE_CHAIN (arg_types
);
200 parms
= TREE_CHAIN (DECL_ARGUMENTS (fn
));
202 /* If this is a subobject constructor or destructor, our caller will
203 pass us a pointer to our VTT. */
204 if (CLASSTYPE_VBASECLASSES (DECL_CONTEXT (fn
)))
206 parm
= build_artificial_parm (vtt_parm_identifier
, vtt_parm_type
);
208 /* First add it to DECL_ARGUMENTS between 'this' and the real args... */
209 TREE_CHAIN (parm
) = parms
;
212 /* ...and then to TYPE_ARG_TYPES. */
213 arg_types
= hash_tree_chain (vtt_parm_type
, arg_types
);
215 DECL_HAS_VTT_PARM_P (fn
) = 1;
218 /* Then add the in-charge parm (before the VTT parm). */
219 parm
= build_artificial_parm (in_charge_identifier
, integer_type_node
);
220 TREE_CHAIN (parm
) = parms
;
222 arg_types
= hash_tree_chain (integer_type_node
, arg_types
);
224 /* Insert our new parameter(s) into the list. */
225 TREE_CHAIN (DECL_ARGUMENTS (fn
)) = parms
;
227 /* And rebuild the function type. */
228 fntype
= build_method_type_directly (basetype
, TREE_TYPE (TREE_TYPE (fn
)),
230 if (TYPE_RAISES_EXCEPTIONS (TREE_TYPE (fn
)))
231 fntype
= build_exception_variant (fntype
,
232 TYPE_RAISES_EXCEPTIONS (TREE_TYPE (fn
)));
233 TREE_TYPE (fn
) = fntype
;
235 /* Now we've got the in-charge parameter. */
236 DECL_HAS_IN_CHARGE_PARM_P (fn
) = 1;
239 /* Classes overload their constituent function names automatically.
240 When a function name is declared in a record structure,
241 its name is changed to it overloaded name. Since names for
242 constructors and destructors can conflict, we place a leading
245 CNAME is the name of the class we are grokking for.
247 FUNCTION is a FUNCTION_DECL. It was created by `grokdeclarator'.
249 FLAGS contains bits saying what's special about today's
250 arguments. 1 == DESTRUCTOR. 2 == OPERATOR.
252 If FUNCTION is a destructor, then we must add the `auto-delete' field
253 as a second parameter. There is some hair associated with the fact
254 that we must "declare" this variable in the manner consistent with the
255 way the rest of the arguments were declared.
257 QUALS are the qualifiers for the this pointer. */
260 grokclassfn (tree ctype
, tree function
, enum overload_flags flags
)
262 tree fn_name
= DECL_NAME (function
);
264 /* Even within an `extern "C"' block, members get C++ linkage. See
265 [dcl.link] for details. */
266 SET_DECL_LANGUAGE (function
, lang_cplusplus
);
268 if (fn_name
== NULL_TREE
)
270 error ("name missing for member function");
271 fn_name
= get_identifier ("<anonymous>");
272 DECL_NAME (function
) = fn_name
;
275 DECL_CONTEXT (function
) = ctype
;
277 if (flags
== DTOR_FLAG
)
278 DECL_DESTRUCTOR_P (function
) = 1;
280 if (flags
== DTOR_FLAG
|| DECL_CONSTRUCTOR_P (function
))
281 maybe_retrofit_in_chrg (function
);
284 /* Create an ARRAY_REF, checking for the user doing things backwards
288 grok_array_decl (tree array_expr
, tree index_exp
)
292 tree orig_array_expr
= array_expr
;
293 tree orig_index_exp
= index_exp
;
295 if (error_operand_p (array_expr
) || error_operand_p (index_exp
))
296 return error_mark_node
;
298 if (processing_template_decl
)
300 if (type_dependent_expression_p (array_expr
)
301 || type_dependent_expression_p (index_exp
))
302 return build_min_nt (ARRAY_REF
, array_expr
, index_exp
,
303 NULL_TREE
, NULL_TREE
);
304 array_expr
= build_non_dependent_expr (array_expr
);
305 index_exp
= build_non_dependent_expr (index_exp
);
308 type
= TREE_TYPE (array_expr
);
310 type
= non_reference (type
);
312 /* If they have an `operator[]', use that. */
313 if (MAYBE_CLASS_TYPE_P (type
) || MAYBE_CLASS_TYPE_P (TREE_TYPE (index_exp
)))
314 expr
= build_new_op (ARRAY_REF
, LOOKUP_NORMAL
,
315 array_expr
, index_exp
, NULL_TREE
,
316 /*overloaded_p=*/NULL
, tf_warning_or_error
);
321 /* Otherwise, create an ARRAY_REF for a pointer or array type.
322 It is a little-known fact that, if `a' is an array and `i' is
323 an int, you can write `i[a]', which means the same thing as
325 if (TREE_CODE (type
) == ARRAY_TYPE
)
328 p1
= build_expr_type_conversion (WANT_POINTER
, array_expr
, false);
330 if (TREE_CODE (TREE_TYPE (index_exp
)) == ARRAY_TYPE
)
333 p2
= build_expr_type_conversion (WANT_POINTER
, index_exp
, false);
335 i1
= build_expr_type_conversion (WANT_INT
| WANT_ENUM
, array_expr
,
337 i2
= build_expr_type_conversion (WANT_INT
| WANT_ENUM
, index_exp
,
340 if ((p1
&& i2
) && (i1
&& p2
))
341 error ("ambiguous conversion for array subscript");
344 array_expr
= p1
, index_exp
= i2
;
346 array_expr
= p2
, index_exp
= i1
;
349 error ("invalid types %<%T[%T]%> for array subscript",
350 type
, TREE_TYPE (index_exp
));
351 return error_mark_node
;
354 if (array_expr
== error_mark_node
|| index_exp
== error_mark_node
)
355 error ("ambiguous conversion for array subscript");
357 expr
= build_array_ref (array_expr
, index_exp
, input_location
);
359 if (processing_template_decl
&& expr
!= error_mark_node
)
360 return build_min_non_dep (ARRAY_REF
, expr
, orig_array_expr
, orig_index_exp
,
361 NULL_TREE
, NULL_TREE
);
365 /* Given the cast expression EXP, checking out its validity. Either return
366 an error_mark_node if there was an unavoidable error, return a cast to
367 void for trying to delete a pointer w/ the value 0, or return the
368 call to delete. If DOING_VEC is true, we handle things differently
369 for doing an array delete.
370 Implements ARM $5.3.4. This is called from the parser. */
373 delete_sanity (tree exp
, tree size
, bool doing_vec
, int use_global_delete
)
377 if (exp
== error_mark_node
)
380 if (processing_template_decl
)
382 t
= build_min (DELETE_EXPR
, void_type_node
, exp
, size
);
383 DELETE_EXPR_USE_GLOBAL (t
) = use_global_delete
;
384 DELETE_EXPR_USE_VEC (t
) = doing_vec
;
385 TREE_SIDE_EFFECTS (t
) = 1;
389 /* An array can't have been allocated by new, so complain. */
390 if (TREE_CODE (exp
) == VAR_DECL
391 && TREE_CODE (TREE_TYPE (exp
)) == ARRAY_TYPE
)
392 warning (0, "deleting array %q#D", exp
);
394 t
= build_expr_type_conversion (WANT_POINTER
, exp
, true);
396 if (t
== NULL_TREE
|| t
== error_mark_node
)
398 error ("type %q#T argument given to %<delete%>, expected pointer",
400 return error_mark_node
;
403 type
= TREE_TYPE (t
);
405 /* As of Valley Forge, you can delete a pointer to const. */
407 /* You can't delete functions. */
408 if (TREE_CODE (TREE_TYPE (type
)) == FUNCTION_TYPE
)
410 error ("cannot delete a function. Only pointer-to-objects are "
411 "valid arguments to %<delete%>");
412 return error_mark_node
;
415 /* Deleting ptr to void is undefined behavior [expr.delete/3]. */
416 if (TREE_CODE (TREE_TYPE (type
)) == VOID_TYPE
)
418 warning (0, "deleting %qT is undefined", type
);
422 /* Deleting a pointer with the value zero is valid and has no effect. */
423 if (integer_zerop (t
))
424 return build1 (NOP_EXPR
, void_type_node
, t
);
427 return build_vec_delete (t
, /*maxindex=*/NULL_TREE
,
428 sfk_deleting_destructor
,
431 return build_delete (type
, t
, sfk_deleting_destructor
,
432 LOOKUP_NORMAL
, use_global_delete
);
435 /* Report an error if the indicated template declaration is not the
436 sort of thing that should be a member template. */
439 check_member_template (tree tmpl
)
443 gcc_assert (TREE_CODE (tmpl
) == TEMPLATE_DECL
);
444 decl
= DECL_TEMPLATE_RESULT (tmpl
);
446 if (TREE_CODE (decl
) == FUNCTION_DECL
447 || (TREE_CODE (decl
) == TYPE_DECL
448 && MAYBE_CLASS_TYPE_P (TREE_TYPE (decl
))))
450 /* The parser rejects template declarations in local classes. */
451 gcc_assert (!current_function_decl
);
452 /* The parser rejects any use of virtual in a function template. */
453 gcc_assert (!(TREE_CODE (decl
) == FUNCTION_DECL
454 && DECL_VIRTUAL_P (decl
)));
456 /* The debug-information generating code doesn't know what to do
457 with member templates. */
458 DECL_IGNORED_P (tmpl
) = 1;
461 error ("template declaration of %q#D", decl
);
464 /* Return true iff TYPE is a valid Java parameter or return type. */
467 acceptable_java_type (tree type
)
469 if (type
== error_mark_node
)
472 if (TREE_CODE (type
) == VOID_TYPE
|| TYPE_FOR_JAVA (type
))
474 if (TREE_CODE (type
) == POINTER_TYPE
|| TREE_CODE (type
) == REFERENCE_TYPE
)
476 type
= TREE_TYPE (type
);
477 if (TREE_CODE (type
) == RECORD_TYPE
)
480 if (! TYPE_FOR_JAVA (type
))
482 if (! CLASSTYPE_TEMPLATE_INFO (type
))
484 args
= CLASSTYPE_TI_ARGS (type
);
485 i
= TREE_VEC_LENGTH (args
);
488 type
= TREE_VEC_ELT (args
, i
);
489 if (TREE_CODE (type
) == POINTER_TYPE
)
490 type
= TREE_TYPE (type
);
491 if (! TYPE_FOR_JAVA (type
))
500 /* For a METHOD in a Java class CTYPE, return true if
501 the parameter and return types are valid Java types.
502 Otherwise, print appropriate error messages, and return false. */
505 check_java_method (tree method
)
508 tree arg_types
= TYPE_ARG_TYPES (TREE_TYPE (method
));
509 tree ret_type
= TREE_TYPE (TREE_TYPE (method
));
511 if (!acceptable_java_type (ret_type
))
513 error ("Java method %qD has non-Java return type %qT",
518 arg_types
= TREE_CHAIN (arg_types
);
519 if (DECL_HAS_IN_CHARGE_PARM_P (method
))
520 arg_types
= TREE_CHAIN (arg_types
);
521 if (DECL_HAS_VTT_PARM_P (method
))
522 arg_types
= TREE_CHAIN (arg_types
);
524 for (; arg_types
!= NULL_TREE
; arg_types
= TREE_CHAIN (arg_types
))
526 tree type
= TREE_VALUE (arg_types
);
527 if (!acceptable_java_type (type
))
529 if (type
!= error_mark_node
)
530 error ("Java method %qD has non-Java parameter type %qT",
538 /* Sanity check: report error if this function FUNCTION is not
539 really a member of the class (CTYPE) it is supposed to belong to.
540 TEMPLATE_PARMS is used to specify the template parameters of a member
541 template passed as FUNCTION_DECL. If the member template is passed as a
542 TEMPLATE_DECL, it can be NULL since the parameters can be extracted
543 from the declaration. If the function is not a function template, it
545 It returns the original declaration for the function, NULL_TREE if
546 no declaration was found, error_mark_node if an error was emitted. */
549 check_classfn (tree ctype
, tree function
, tree template_parms
)
555 if (DECL_USE_TEMPLATE (function
)
556 && !(TREE_CODE (function
) == TEMPLATE_DECL
557 && DECL_TEMPLATE_SPECIALIZATION (function
))
558 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (function
)))
559 /* Since this is a specialization of a member template,
560 we're not going to find the declaration in the class.
563 struct S { template <typename T> void f(T); };
564 template <> void S::f(int);
566 we're not going to find `S::f(int)', but there's no
567 reason we should, either. We let our callers know we didn't
568 find the method, but we don't complain. */
571 /* Basic sanity check: for a template function, the template parameters
572 either were not passed, or they are the same of DECL_TEMPLATE_PARMS. */
573 if (TREE_CODE (function
) == TEMPLATE_DECL
)
576 && !comp_template_parms (template_parms
,
577 DECL_TEMPLATE_PARMS (function
)))
579 error ("template parameter lists provided don't match the "
580 "template parameters of %qD", function
);
581 return error_mark_node
;
583 template_parms
= DECL_TEMPLATE_PARMS (function
);
586 /* OK, is this a definition of a member template? */
587 is_template
= (template_parms
!= NULL_TREE
);
589 /* We must enter the scope here, because conversion operators are
590 named by target type, and type equivalence relies on typenames
591 resolving within the scope of CTYPE. */
592 pushed_scope
= push_scope (ctype
);
593 ix
= class_method_index_for_fn (complete_type (ctype
), function
);
596 VEC(tree
,gc
) *methods
= CLASSTYPE_METHOD_VEC (ctype
);
597 tree fndecls
, fndecl
= 0;
599 const char *format
= NULL
;
601 for (fndecls
= VEC_index (tree
, methods
, ix
);
602 fndecls
; fndecls
= OVL_NEXT (fndecls
))
606 fndecl
= OVL_CURRENT (fndecls
);
607 p1
= TYPE_ARG_TYPES (TREE_TYPE (function
));
608 p2
= TYPE_ARG_TYPES (TREE_TYPE (fndecl
));
610 /* We cannot simply call decls_match because this doesn't
611 work for static member functions that are pretending to
612 be methods, and because the name may have been changed by
615 /* Get rid of the this parameter on functions that become
617 if (DECL_STATIC_FUNCTION_P (fndecl
)
618 && TREE_CODE (TREE_TYPE (function
)) == METHOD_TYPE
)
619 p1
= TREE_CHAIN (p1
);
621 /* A member template definition only matches a member template
623 if (is_template
!= (TREE_CODE (fndecl
) == TEMPLATE_DECL
))
626 if (same_type_p (TREE_TYPE (TREE_TYPE (function
)),
627 TREE_TYPE (TREE_TYPE (fndecl
)))
628 && compparms (p1
, p2
)
630 || comp_template_parms (template_parms
,
631 DECL_TEMPLATE_PARMS (fndecl
)))
632 && (DECL_TEMPLATE_SPECIALIZATION (function
)
633 == DECL_TEMPLATE_SPECIALIZATION (fndecl
))
634 && (!DECL_TEMPLATE_SPECIALIZATION (function
)
635 || (DECL_TI_TEMPLATE (function
)
636 == DECL_TI_TEMPLATE (fndecl
))))
642 pop_scope (pushed_scope
);
643 return OVL_CURRENT (fndecls
);
646 error_at (DECL_SOURCE_LOCATION (function
),
647 "prototype for %q#D does not match any in class %qT",
649 is_conv_op
= DECL_CONV_FN_P (fndecl
);
652 ix
= CLASSTYPE_FIRST_CONVERSION_SLOT
;
653 fndecls
= VEC_index (tree
, methods
, ix
);
656 fndecl
= OVL_CURRENT (fndecls
);
657 fndecls
= OVL_NEXT (fndecls
);
659 if (!fndecls
&& is_conv_op
)
661 if (VEC_length (tree
, methods
) > (size_t) ++ix
)
663 fndecls
= VEC_index (tree
, methods
, ix
);
664 if (!DECL_CONV_FN_P (OVL_CURRENT (fndecls
)))
676 format
= N_("candidates are: %+#D");
678 format
= N_("candidate is: %+#D");
679 error (format
, fndecl
);
682 else if (!COMPLETE_TYPE_P (ctype
))
683 cxx_incomplete_type_error (function
, ctype
);
685 error ("no %q#D member function declared in class %qT",
689 pop_scope (pushed_scope
);
690 return error_mark_node
;
693 /* DECL is a function with vague linkage. Remember it so that at the
694 end of the translation unit we can decide whether or not to emit
698 note_vague_linkage_fn (tree decl
)
700 if (!DECL_DEFERRED_FN (decl
))
702 DECL_DEFERRED_FN (decl
) = 1;
703 DECL_DEFER_OUTPUT (decl
) = 1;
704 VEC_safe_push (tree
, gc
, deferred_fns
, decl
);
708 /* We have just processed the DECL, which is a static data member.
709 The other parameters are as for cp_finish_decl. */
712 finish_static_data_member_decl (tree decl
,
713 tree init
, bool init_const_expr_p
,
717 DECL_CONTEXT (decl
) = current_class_type
;
719 /* We cannot call pushdecl here, because that would fill in the
720 TREE_CHAIN of our decl. Instead, we modify cp_finish_decl to do
721 the right thing, namely, to put this decl out straight away. */
723 if (! processing_template_decl
)
724 VEC_safe_push (tree
, gc
, pending_statics
, decl
);
726 if (LOCAL_CLASS_P (current_class_type
))
727 permerror (input_location
, "local class %q#T shall not have static data member %q#D",
728 current_class_type
, decl
);
730 /* Static consts need not be initialized in the class definition. */
731 if (init
!= NULL_TREE
&& TYPE_NEEDS_CONSTRUCTING (TREE_TYPE (decl
)))
733 static int explained
= 0;
735 error ("initializer invalid for static member with constructor");
738 error ("(an out of class initialization is required)");
743 /* Force the compiler to know when an uninitialized static const
744 member is being used. */
745 if (CP_TYPE_CONST_P (TREE_TYPE (decl
)) && init
== 0)
746 TREE_USED (decl
) = 1;
747 DECL_INITIAL (decl
) = init
;
748 DECL_IN_AGGR_P (decl
) = 1;
750 cp_finish_decl (decl
, init
, init_const_expr_p
, asmspec_tree
, flags
);
753 /* DECLARATOR and DECLSPECS correspond to a class member. The other
754 parameters are as for cp_finish_decl. Return the DECL for the
755 class member declared. */
758 grokfield (const cp_declarator
*declarator
,
759 cp_decl_specifier_seq
*declspecs
,
760 tree init
, bool init_const_expr_p
,
765 const char *asmspec
= 0;
766 int flags
= LOOKUP_ONLYCONVERTING
;
769 && TREE_CODE (init
) == TREE_LIST
770 && TREE_VALUE (init
) == error_mark_node
771 && TREE_CHAIN (init
) == NULL_TREE
)
774 value
= grokdeclarator (declarator
, declspecs
, FIELD
, init
!= 0, &attrlist
);
775 if (! value
|| error_operand_p (value
))
776 /* friend or constructor went bad. */
777 return error_mark_node
;
779 if (TREE_CODE (value
) == TYPE_DECL
&& init
)
781 error ("typedef %qD is initialized (use __typeof__ instead)", value
);
785 /* Pass friendly classes back. */
786 if (value
== void_type_node
)
789 /* Pass friend decls back. */
790 if ((TREE_CODE (value
) == FUNCTION_DECL
791 || TREE_CODE (value
) == TEMPLATE_DECL
)
792 && DECL_CONTEXT (value
) != current_class_type
)
795 if (DECL_NAME (value
) != NULL_TREE
796 && IDENTIFIER_POINTER (DECL_NAME (value
))[0] == '_'
797 && ! strcmp (IDENTIFIER_POINTER (DECL_NAME (value
)), "_vptr"))
798 error ("member %qD conflicts with virtual function table field name",
801 /* Stash away type declarations. */
802 if (TREE_CODE (value
) == TYPE_DECL
)
804 DECL_NONLOCAL (value
) = 1;
805 DECL_CONTEXT (value
) = current_class_type
;
807 if (processing_template_decl
)
808 value
= push_template_decl (value
);
814 /* If this is a typedef that names the class for linkage purposes
815 (7.1.3p8), apply any attributes directly to the type. */
816 if (TAGGED_TYPE_P (TREE_TYPE (value
))
817 && value
== TYPE_NAME (TYPE_MAIN_VARIANT (TREE_TYPE (value
))))
818 attrflags
= ATTR_FLAG_TYPE_IN_PLACE
;
820 cplus_decl_attributes (&value
, attrlist
, attrflags
);
823 if (declspecs
->specs
[(int)ds_typedef
])
824 set_underlying_type (value
);
829 if (DECL_IN_AGGR_P (value
))
831 error ("%qD is already defined in %qT", value
, DECL_CONTEXT (value
));
832 return void_type_node
;
835 if (asmspec_tree
&& asmspec_tree
!= error_mark_node
)
836 asmspec
= TREE_STRING_POINTER (asmspec_tree
);
840 if (TREE_CODE (value
) == FUNCTION_DECL
)
842 /* Initializers for functions are rejected early in the parser.
843 If we get here, it must be a pure specifier for a method. */
844 if (init
== ridpointers
[(int)RID_DELETE
])
846 DECL_DELETED_FN (value
) = 1;
847 DECL_DECLARED_INLINE_P (value
) = 1;
848 DECL_INITIAL (value
) = error_mark_node
;
850 else if (init
== ridpointers
[(int)RID_DEFAULT
])
852 if (!defaultable_fn_p (value
))
853 error ("%qD cannot be defaulted", value
);
856 DECL_DEFAULTED_FN (value
) = 1;
857 DECL_INITIALIZED_IN_CLASS_P (value
) = 1;
858 DECL_DECLARED_INLINE_P (value
) = 1;
861 else if (TREE_CODE (TREE_TYPE (value
)) == METHOD_TYPE
)
863 gcc_assert (error_operand_p (init
) || integer_zerop (init
));
864 DECL_PURE_VIRTUAL_P (value
) = 1;
868 gcc_assert (TREE_CODE (TREE_TYPE (value
)) == FUNCTION_TYPE
);
869 error ("initializer specified for static member function %qD",
873 else if (pedantic
&& TREE_CODE (value
) != VAR_DECL
)
874 /* Already complained in grokdeclarator. */
876 else if (!processing_template_decl
)
878 if (TREE_CODE (init
) == CONSTRUCTOR
)
879 init
= digest_init (TREE_TYPE (value
), init
);
881 init
= integral_constant_value (init
);
883 if (init
!= error_mark_node
&& !TREE_CONSTANT (init
))
885 /* We can allow references to things that are effectively
886 static, since references are initialized with the
888 if (TREE_CODE (TREE_TYPE (value
)) != REFERENCE_TYPE
889 || (TREE_STATIC (init
) == 0
890 && (!DECL_P (init
) || DECL_EXTERNAL (init
) == 0)))
892 error ("field initializer is not constant");
893 init
= error_mark_node
;
899 if (processing_template_decl
900 && (TREE_CODE (value
) == VAR_DECL
|| TREE_CODE (value
) == FUNCTION_DECL
))
902 value
= push_template_decl (value
);
903 if (error_operand_p (value
))
904 return error_mark_node
;
908 cplus_decl_attributes (&value
, attrlist
, 0);
910 switch (TREE_CODE (value
))
913 finish_static_data_member_decl (value
, init
, init_const_expr_p
,
914 asmspec_tree
, flags
);
919 error ("%<asm%> specifiers are not permitted on non-static data members");
920 if (DECL_INITIAL (value
) == error_mark_node
)
921 init
= error_mark_node
;
922 cp_finish_decl (value
, init
, /*init_const_expr_p=*/false,
924 DECL_INITIAL (value
) = init
;
925 DECL_IN_AGGR_P (value
) = 1;
930 set_user_assembler_name (value
, asmspec
);
932 cp_finish_decl (value
,
934 /*init_const_expr_p=*/false,
935 asmspec_tree
, flags
);
937 /* Pass friends back this way. */
938 if (DECL_FRIEND_P (value
))
939 return void_type_node
;
941 DECL_IN_AGGR_P (value
) = 1;
950 /* Like `grokfield', but for bitfields.
951 WIDTH is non-NULL for bit fields only, and is an INTEGER_CST node. */
954 grokbitfield (const cp_declarator
*declarator
,
955 cp_decl_specifier_seq
*declspecs
, tree width
,
958 tree value
= grokdeclarator (declarator
, declspecs
, BITFIELD
, 0, &attrlist
);
960 if (value
== error_mark_node
)
961 return NULL_TREE
; /* friends went bad. */
963 /* Pass friendly classes back. */
964 if (TREE_CODE (value
) == VOID_TYPE
)
965 return void_type_node
;
967 if (!INTEGRAL_TYPE_P (TREE_TYPE (value
))
968 && (POINTER_TYPE_P (value
)
969 || !dependent_type_p (TREE_TYPE (value
))))
971 error ("bit-field %qD with non-integral type", value
);
972 return error_mark_node
;
975 if (TREE_CODE (value
) == TYPE_DECL
)
977 error ("cannot declare %qD to be a bit-field type", value
);
981 /* Usually, finish_struct_1 catches bitfields with invalid types.
982 But, in the case of bitfields with function type, we confuse
983 ourselves into thinking they are member functions, so we must
985 if (TREE_CODE (value
) == FUNCTION_DECL
)
987 error ("cannot declare bit-field %qD with function type",
992 if (DECL_IN_AGGR_P (value
))
994 error ("%qD is already defined in the class %qT", value
,
995 DECL_CONTEXT (value
));
996 return void_type_node
;
999 if (TREE_STATIC (value
))
1001 error ("static member %qD cannot be a bit-field", value
);
1004 finish_decl (value
, NULL_TREE
, NULL_TREE
, NULL_TREE
);
1006 if (width
!= error_mark_node
)
1008 constant_expression_warning (width
);
1009 DECL_INITIAL (value
) = width
;
1010 SET_DECL_C_BIT_FIELD (value
);
1013 DECL_IN_AGGR_P (value
) = 1;
1016 cplus_decl_attributes (&value
, attrlist
, /*flags=*/0);
1022 /* Returns true iff ATTR is an attribute which needs to be applied at
1023 instantiation time rather than template definition time. */
1026 is_late_template_attribute (tree attr
, tree decl
)
1028 tree name
= TREE_PURPOSE (attr
);
1029 tree args
= TREE_VALUE (attr
);
1030 const struct attribute_spec
*spec
= lookup_attribute_spec (name
);
1034 /* Unknown attribute. */
1037 /* Attribute weak handling wants to write out assembly right away. */
1038 if (is_attribute_p ("weak", name
))
1041 /* If any of the arguments are dependent expressions, we can't evaluate
1042 the attribute until instantiation time. */
1043 for (arg
= args
; arg
; arg
= TREE_CHAIN (arg
))
1045 tree t
= TREE_VALUE (arg
);
1047 /* If the first attribute argument is an identifier, only consider
1048 second and following arguments. Attributes like mode, format,
1049 cleanup and several target specific attributes aren't late
1050 just because they have an IDENTIFIER_NODE as first argument. */
1051 if (arg
== args
&& TREE_CODE (t
) == IDENTIFIER_NODE
)
1054 if (value_dependent_expression_p (t
)
1055 || type_dependent_expression_p (t
))
1059 if (TREE_CODE (decl
) == TYPE_DECL
1061 || spec
->type_required
)
1063 tree type
= TYPE_P (decl
) ? decl
: TREE_TYPE (decl
);
1065 /* We can't apply any attributes to a completely unknown type until
1066 instantiation time. */
1067 enum tree_code code
= TREE_CODE (type
);
1068 if (code
== TEMPLATE_TYPE_PARM
1069 || code
== BOUND_TEMPLATE_TEMPLATE_PARM
1070 || code
== TYPENAME_TYPE
)
1072 /* Also defer most attributes on dependent types. This is not
1073 necessary in all cases, but is the better default. */
1074 else if (dependent_type_p (type
)
1075 /* But attribute visibility specifically works on
1077 && !is_attribute_p ("visibility", name
))
1086 /* ATTR_P is a list of attributes. Remove any attributes which need to be
1087 applied at instantiation time and return them. If IS_DEPENDENT is true,
1088 the declaration itself is dependent, so all attributes should be applied
1089 at instantiation time. */
1092 splice_template_attributes (tree
*attr_p
, tree decl
)
1095 tree late_attrs
= NULL_TREE
;
1096 tree
*q
= &late_attrs
;
1103 if (is_late_template_attribute (*p
, decl
))
1105 ATTR_IS_DEPENDENT (*p
) = 1;
1107 *p
= TREE_CHAIN (*p
);
1108 q
= &TREE_CHAIN (*q
);
1112 p
= &TREE_CHAIN (*p
);
1118 /* Remove any late attributes from the list in ATTR_P and attach them to
1122 save_template_attributes (tree
*attr_p
, tree
*decl_p
)
1124 tree late_attrs
= splice_template_attributes (attr_p
, *decl_p
);
1126 tree old_attrs
= NULL_TREE
;
1131 if (DECL_P (*decl_p
))
1132 q
= &DECL_ATTRIBUTES (*decl_p
);
1134 q
= &TYPE_ATTRIBUTES (*decl_p
);
1138 /* Place the late attributes at the beginning of the attribute
1140 TREE_CHAIN (tree_last (late_attrs
)) = *q
;
1143 if (!DECL_P (*decl_p
) && *decl_p
== TYPE_MAIN_VARIANT (*decl_p
))
1145 /* We've added new attributes directly to the main variant, so
1146 now we need to update all of the other variants to include
1147 these new attributes. */
1149 for (variant
= TYPE_NEXT_VARIANT (*decl_p
); variant
;
1150 variant
= TYPE_NEXT_VARIANT (variant
))
1152 gcc_assert (TYPE_ATTRIBUTES (variant
) == old_attrs
);
1153 TYPE_ATTRIBUTES (variant
) = TYPE_ATTRIBUTES (*decl_p
);
1158 /* Like reconstruct_complex_type, but handle also template trees. */
1161 cp_reconstruct_complex_type (tree type
, tree bottom
)
1165 if (TREE_CODE (type
) == POINTER_TYPE
)
1167 inner
= cp_reconstruct_complex_type (TREE_TYPE (type
), bottom
);
1168 outer
= build_pointer_type_for_mode (inner
, TYPE_MODE (type
),
1169 TYPE_REF_CAN_ALIAS_ALL (type
));
1171 else if (TREE_CODE (type
) == REFERENCE_TYPE
)
1173 inner
= cp_reconstruct_complex_type (TREE_TYPE (type
), bottom
);
1174 outer
= build_reference_type_for_mode (inner
, TYPE_MODE (type
),
1175 TYPE_REF_CAN_ALIAS_ALL (type
));
1177 else if (TREE_CODE (type
) == ARRAY_TYPE
)
1179 inner
= cp_reconstruct_complex_type (TREE_TYPE (type
), bottom
);
1180 outer
= build_cplus_array_type (inner
, TYPE_DOMAIN (type
));
1181 /* Don't call cp_build_qualified_type on ARRAY_TYPEs, the
1182 element type qualification will be handled by the recursive
1183 cp_reconstruct_complex_type call and cp_build_qualified_type
1184 for ARRAY_TYPEs changes the element type. */
1187 else if (TREE_CODE (type
) == FUNCTION_TYPE
)
1189 inner
= cp_reconstruct_complex_type (TREE_TYPE (type
), bottom
);
1190 outer
= build_function_type (inner
, TYPE_ARG_TYPES (type
));
1192 else if (TREE_CODE (type
) == METHOD_TYPE
)
1194 inner
= cp_reconstruct_complex_type (TREE_TYPE (type
), bottom
);
1195 /* The build_method_type_directly() routine prepends 'this' to argument list,
1196 so we must compensate by getting rid of it. */
1198 = build_method_type_directly
1199 (TREE_TYPE (TREE_VALUE (TYPE_ARG_TYPES (type
))),
1201 TREE_CHAIN (TYPE_ARG_TYPES (type
)));
1203 else if (TREE_CODE (type
) == OFFSET_TYPE
)
1205 inner
= cp_reconstruct_complex_type (TREE_TYPE (type
), bottom
);
1206 outer
= build_offset_type (TYPE_OFFSET_BASETYPE (type
), inner
);
1211 return cp_build_qualified_type (outer
, TYPE_QUALS (type
));
1214 /* Like decl_attributes, but handle C++ complexity. */
1217 cplus_decl_attributes (tree
*decl
, tree attributes
, int flags
)
1219 if (*decl
== NULL_TREE
|| *decl
== void_type_node
1220 || *decl
== error_mark_node
1221 || attributes
== NULL_TREE
)
1224 if (processing_template_decl
)
1226 if (check_for_bare_parameter_packs (attributes
))
1229 save_template_attributes (&attributes
, decl
);
1230 if (attributes
== NULL_TREE
)
1234 if (TREE_CODE (*decl
) == TEMPLATE_DECL
)
1235 decl
= &DECL_TEMPLATE_RESULT (*decl
);
1237 decl_attributes (decl
, attributes
, flags
);
1239 if (TREE_CODE (*decl
) == TYPE_DECL
)
1240 SET_IDENTIFIER_TYPE_VALUE (DECL_NAME (*decl
), TREE_TYPE (*decl
));
1243 /* Walks through the namespace- or function-scope anonymous union
1244 OBJECT, with the indicated TYPE, building appropriate VAR_DECLs.
1245 Returns one of the fields for use in the mangled name. */
1248 build_anon_union_vars (tree type
, tree object
)
1250 tree main_decl
= NULL_TREE
;
1253 /* Rather than write the code to handle the non-union case,
1254 just give an error. */
1255 if (TREE_CODE (type
) != UNION_TYPE
)
1256 error ("anonymous struct not inside named type");
1258 for (field
= TYPE_FIELDS (type
);
1260 field
= TREE_CHAIN (field
))
1265 if (DECL_ARTIFICIAL (field
))
1267 if (TREE_CODE (field
) != FIELD_DECL
)
1269 permerror (input_location
, "%q+#D invalid; an anonymous union can only "
1270 "have non-static data members", field
);
1274 if (TREE_PRIVATE (field
))
1275 permerror (input_location
, "private member %q+#D in anonymous union", field
);
1276 else if (TREE_PROTECTED (field
))
1277 permerror (input_location
, "protected member %q+#D in anonymous union", field
);
1279 if (processing_template_decl
)
1280 ref
= build_min_nt (COMPONENT_REF
, object
,
1281 DECL_NAME (field
), NULL_TREE
);
1283 ref
= build_class_member_access_expr (object
, field
, NULL_TREE
,
1284 false, tf_warning_or_error
);
1286 if (DECL_NAME (field
))
1290 decl
= build_decl (VAR_DECL
, DECL_NAME (field
), TREE_TYPE (field
));
1291 DECL_ANON_UNION_VAR_P (decl
) = 1;
1293 base
= get_base_address (object
);
1294 TREE_PUBLIC (decl
) = TREE_PUBLIC (base
);
1295 TREE_STATIC (decl
) = TREE_STATIC (base
);
1296 DECL_EXTERNAL (decl
) = DECL_EXTERNAL (base
);
1298 SET_DECL_VALUE_EXPR (decl
, ref
);
1299 DECL_HAS_VALUE_EXPR_P (decl
) = 1;
1301 decl
= pushdecl (decl
);
1303 else if (ANON_AGGR_TYPE_P (TREE_TYPE (field
)))
1304 decl
= build_anon_union_vars (TREE_TYPE (field
), ref
);
1308 if (main_decl
== NULL_TREE
)
1315 /* Finish off the processing of a UNION_TYPE structure. If the union is an
1316 anonymous union, then all members must be laid out together. PUBLIC_P
1317 is nonzero if this union is not declared static. */
1320 finish_anon_union (tree anon_union_decl
)
1326 if (anon_union_decl
== error_mark_node
)
1329 type
= TREE_TYPE (anon_union_decl
);
1330 public_p
= TREE_PUBLIC (anon_union_decl
);
1332 /* The VAR_DECL's context is the same as the TYPE's context. */
1333 DECL_CONTEXT (anon_union_decl
) = DECL_CONTEXT (TYPE_NAME (type
));
1335 if (TYPE_FIELDS (type
) == NULL_TREE
)
1340 error ("namespace-scope anonymous aggregates must be static");
1344 main_decl
= build_anon_union_vars (type
, anon_union_decl
);
1345 if (main_decl
== error_mark_node
)
1347 if (main_decl
== NULL_TREE
)
1349 warning (0, "anonymous union with no members");
1353 if (!processing_template_decl
)
1355 /* Use main_decl to set the mangled name. */
1356 DECL_NAME (anon_union_decl
) = DECL_NAME (main_decl
);
1357 maybe_commonize_var (anon_union_decl
);
1358 mangle_decl (anon_union_decl
);
1359 DECL_NAME (anon_union_decl
) = NULL_TREE
;
1362 pushdecl (anon_union_decl
);
1363 if (building_stmt_tree ()
1364 && at_function_scope_p ())
1365 add_decl_expr (anon_union_decl
);
1366 else if (!processing_template_decl
)
1367 rest_of_decl_compilation (anon_union_decl
,
1368 toplevel_bindings_p (), at_eof
);
1371 /* Auxiliary functions to make type signatures for
1372 `operator new' and `operator delete' correspond to
1373 what compiler will be expecting. */
1376 coerce_new_type (tree type
)
1379 tree args
= TYPE_ARG_TYPES (type
);
1381 gcc_assert (TREE_CODE (type
) == FUNCTION_TYPE
);
1383 if (!same_type_p (TREE_TYPE (type
), ptr_type_node
))
1386 error ("%<operator new%> must return type %qT", ptr_type_node
);
1389 if (args
&& args
!= void_list_node
)
1391 if (TREE_PURPOSE (args
))
1393 /* [basic.stc.dynamic.allocation]
1395 The first parameter shall not have an associated default
1397 error ("the first parameter of %<operator new%> cannot "
1398 "have a default argument");
1399 /* Throw away the default argument. */
1400 TREE_PURPOSE (args
) = NULL_TREE
;
1403 if (!same_type_p (TREE_VALUE (args
), size_type_node
))
1406 args
= TREE_CHAIN (args
);
1413 permerror (input_location
, "%<operator new%> takes type %<size_t%> (%qT) "
1414 "as first parameter", size_type_node
);
1419 args
= tree_cons (NULL_TREE
, size_type_node
, args
);
1422 type
= build_exception_variant
1423 (build_function_type (ptr_type_node
, args
),
1424 TYPE_RAISES_EXCEPTIONS (type
));
1432 coerce_delete_type (tree type
)
1435 tree args
= TYPE_ARG_TYPES (type
);
1437 gcc_assert (TREE_CODE (type
) == FUNCTION_TYPE
);
1439 if (!same_type_p (TREE_TYPE (type
), void_type_node
))
1442 error ("%<operator delete%> must return type %qT", void_type_node
);
1445 if (!args
|| args
== void_list_node
1446 || !same_type_p (TREE_VALUE (args
), ptr_type_node
))
1449 if (args
&& args
!= void_list_node
)
1450 args
= TREE_CHAIN (args
);
1451 error ("%<operator delete%> takes type %qT as first parameter",
1457 args
= tree_cons (NULL_TREE
, ptr_type_node
, args
);
1460 type
= build_exception_variant
1461 (build_function_type (void_type_node
, args
),
1462 TYPE_RAISES_EXCEPTIONS (type
));
1470 /* DECL is a VAR_DECL for a vtable: walk through the entries in the vtable
1471 and mark them as needed. */
1474 mark_vtable_entries (tree decl
)
1477 unsigned HOST_WIDE_INT idx
;
1479 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (DECL_INITIAL (decl
)),
1484 STRIP_NOPS (fnaddr
);
1486 if (TREE_CODE (fnaddr
) != ADDR_EXPR
1487 && TREE_CODE (fnaddr
) != FDESC_EXPR
)
1488 /* This entry is an offset: a virtual base class offset, a
1489 virtual call offset, an RTTI offset, etc. */
1492 fn
= TREE_OPERAND (fnaddr
, 0);
1493 TREE_ADDRESSABLE (fn
) = 1;
1494 /* When we don't have vcall offsets, we output thunks whenever
1495 we output the vtables that contain them. With vcall offsets,
1496 we know all the thunks we'll need when we emit a virtual
1497 function, so we emit the thunks there instead. */
1498 if (DECL_THUNK_P (fn
))
1499 use_thunk (fn
, /*emit_p=*/0);
1504 /* Set DECL up to have the closest approximation of "initialized common"
1505 linkage available. */
1508 comdat_linkage (tree decl
)
1511 make_decl_one_only (decl
);
1512 else if (TREE_CODE (decl
) == FUNCTION_DECL
1513 || (TREE_CODE (decl
) == VAR_DECL
&& DECL_ARTIFICIAL (decl
)))
1514 /* We can just emit function and compiler-generated variables
1515 statically; having multiple copies is (for the most part) only
1518 There are two correctness issues, however: the address of a
1519 template instantiation with external linkage should be the
1520 same, independent of what translation unit asks for the
1521 address, and this will not hold when we emit multiple copies of
1522 the function. However, there's little else we can do.
1524 Also, by default, the typeinfo implementation assumes that
1525 there will be only one copy of the string used as the name for
1526 each type. Therefore, if weak symbols are unavailable, the
1527 run-time library should perform a more conservative check; it
1528 should perform a string comparison, rather than an address
1530 TREE_PUBLIC (decl
) = 0;
1533 /* Static data member template instantiations, however, cannot
1534 have multiple copies. */
1535 if (DECL_INITIAL (decl
) == 0
1536 || DECL_INITIAL (decl
) == error_mark_node
)
1537 DECL_COMMON (decl
) = 1;
1538 else if (EMPTY_CONSTRUCTOR_P (DECL_INITIAL (decl
)))
1540 DECL_COMMON (decl
) = 1;
1541 DECL_INITIAL (decl
) = error_mark_node
;
1543 else if (!DECL_EXPLICIT_INSTANTIATION (decl
))
1545 /* We can't do anything useful; leave vars for explicit
1547 DECL_EXTERNAL (decl
) = 1;
1548 DECL_NOT_REALLY_EXTERN (decl
) = 0;
1552 if (DECL_LANG_SPECIFIC (decl
))
1553 DECL_COMDAT (decl
) = 1;
1556 /* For win32 we also want to put explicit instantiations in
1557 linkonce sections, so that they will be merged with implicit
1558 instantiations; otherwise we get duplicate symbol errors.
1559 For Darwin we do not want explicit instantiations to be
1563 maybe_make_one_only (tree decl
)
1565 /* We used to say that this was not necessary on targets that support weak
1566 symbols, because the implicit instantiations will defer to the explicit
1567 one. However, that's not actually the case in SVR4; a strong definition
1568 after a weak one is an error. Also, not making explicit
1569 instantiations one_only means that we can end up with two copies of
1570 some template instantiations. */
1574 /* We can't set DECL_COMDAT on functions, or cp_finish_file will think
1575 we can get away with not emitting them if they aren't used. We need
1576 to for variables so that cp_finish_decl will update their linkage,
1577 because their DECL_INITIAL may not have been set properly yet. */
1579 if (!TARGET_WEAK_NOT_IN_ARCHIVE_TOC
1580 || (! DECL_EXPLICIT_INSTANTIATION (decl
)
1581 && ! DECL_TEMPLATE_SPECIALIZATION (decl
)))
1583 make_decl_one_only (decl
);
1585 if (TREE_CODE (decl
) == VAR_DECL
)
1587 DECL_COMDAT (decl
) = 1;
1588 /* Mark it needed so we don't forget to emit it. */
1589 mark_decl_referenced (decl
);
1594 /* Determine whether or not we want to specifically import or export CTYPE,
1595 using various heuristics. */
1598 import_export_class (tree ctype
)
1600 /* -1 for imported, 1 for exported. */
1601 int import_export
= 0;
1603 /* It only makes sense to call this function at EOF. The reason is
1604 that this function looks at whether or not the first non-inline
1605 non-abstract virtual member function has been defined in this
1606 translation unit. But, we can't possibly know that until we've
1607 seen the entire translation unit. */
1608 gcc_assert (at_eof
);
1610 if (CLASSTYPE_INTERFACE_KNOWN (ctype
))
1613 /* If MULTIPLE_SYMBOL_SPACES is set and we saw a #pragma interface,
1614 we will have CLASSTYPE_INTERFACE_ONLY set but not
1615 CLASSTYPE_INTERFACE_KNOWN. In that case, we don't want to use this
1616 heuristic because someone will supply a #pragma implementation
1617 elsewhere, and deducing it here would produce a conflict. */
1618 if (CLASSTYPE_INTERFACE_ONLY (ctype
))
1621 if (lookup_attribute ("dllimport", TYPE_ATTRIBUTES (ctype
)))
1623 else if (lookup_attribute ("dllexport", TYPE_ATTRIBUTES (ctype
)))
1625 else if (CLASSTYPE_IMPLICIT_INSTANTIATION (ctype
)
1626 && !flag_implicit_templates
)
1627 /* For a template class, without -fimplicit-templates, check the
1628 repository. If the virtual table is assigned to this
1629 translation unit, then export the class; otherwise, import
1631 import_export
= repo_export_class_p (ctype
) ? 1 : -1;
1632 else if (TYPE_POLYMORPHIC_P (ctype
))
1634 /* The ABI specifies that the virtual table and associated
1635 information are emitted with the key method, if any. */
1636 tree method
= CLASSTYPE_KEY_METHOD (ctype
);
1637 /* If weak symbol support is not available, then we must be
1638 careful not to emit the vtable when the key function is
1639 inline. An inline function can be defined in multiple
1640 translation units. If we were to emit the vtable in each
1641 translation unit containing a definition, we would get
1642 multiple definition errors at link-time. */
1643 if (method
&& (flag_weak
|| ! DECL_DECLARED_INLINE_P (method
)))
1644 import_export
= (DECL_REALLY_EXTERN (method
) ? -1 : 1);
1647 /* When MULTIPLE_SYMBOL_SPACES is set, we cannot count on seeing
1648 a definition anywhere else. */
1649 if (MULTIPLE_SYMBOL_SPACES
&& import_export
== -1)
1652 /* Allow back ends the chance to overrule the decision. */
1653 if (targetm
.cxx
.import_export_class
)
1654 import_export
= targetm
.cxx
.import_export_class (ctype
, import_export
);
1658 SET_CLASSTYPE_INTERFACE_KNOWN (ctype
);
1659 CLASSTYPE_INTERFACE_ONLY (ctype
) = (import_export
< 0);
1663 /* Return true if VAR has already been provided to the back end; in that
1664 case VAR should not be modified further by the front end. */
1666 var_finalized_p (tree var
)
1668 return varpool_node (var
)->finalized
;
1671 /* DECL is a VAR_DECL or FUNCTION_DECL which, for whatever reason,
1672 must be emitted in this translation unit. Mark it as such. */
1675 mark_needed (tree decl
)
1677 /* It's possible that we no longer need to set
1678 TREE_SYMBOL_REFERENCED here directly, but doing so is
1680 TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
)) = 1;
1681 mark_decl_referenced (decl
);
1684 /* DECL is either a FUNCTION_DECL or a VAR_DECL. This function
1685 returns true if a definition of this entity should be provided in
1686 this object file. Callers use this function to determine whether
1687 or not to let the back end know that a definition of DECL is
1688 available in this translation unit. */
1691 decl_needed_p (tree decl
)
1693 gcc_assert (TREE_CODE (decl
) == VAR_DECL
1694 || TREE_CODE (decl
) == FUNCTION_DECL
);
1695 /* This function should only be called at the end of the translation
1696 unit. We cannot be sure of whether or not something will be
1697 COMDAT until that point. */
1698 gcc_assert (at_eof
);
1700 /* All entities with external linkage that are not COMDAT should be
1701 emitted; they may be referred to from other object files. */
1702 if (TREE_PUBLIC (decl
) && !DECL_COMDAT (decl
))
1704 /* If this entity was used, let the back end see it; it will decide
1705 whether or not to emit it into the object file. */
1706 if (TREE_USED (decl
)
1707 || (DECL_ASSEMBLER_NAME_SET_P (decl
)
1708 && TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
))))
1710 /* Otherwise, DECL does not need to be emitted -- yet. A subsequent
1711 reference to DECL might cause it to be emitted later. */
1715 /* If necessary, write out the vtables for the dynamic class CTYPE.
1716 Returns true if any vtables were emitted. */
1719 maybe_emit_vtables (tree ctype
)
1725 /* If the vtables for this class have already been emitted there is
1726 nothing more to do. */
1727 primary_vtbl
= CLASSTYPE_VTABLES (ctype
);
1728 if (var_finalized_p (primary_vtbl
))
1730 /* Ignore dummy vtables made by get_vtable_decl. */
1731 if (TREE_TYPE (primary_vtbl
) == void_type_node
)
1734 /* On some targets, we cannot determine the key method until the end
1735 of the translation unit -- which is when this function is
1737 if (!targetm
.cxx
.key_method_may_be_inline ())
1738 determine_key_method (ctype
);
1740 /* See if any of the vtables are needed. */
1741 for (vtbl
= CLASSTYPE_VTABLES (ctype
); vtbl
; vtbl
= TREE_CHAIN (vtbl
))
1743 import_export_decl (vtbl
);
1744 if (DECL_NOT_REALLY_EXTERN (vtbl
) && decl_needed_p (vtbl
))
1749 /* If the references to this class' vtables are optimized away,
1750 still emit the appropriate debugging information. See
1752 if (DECL_COMDAT (primary_vtbl
)
1753 && CLASSTYPE_DEBUG_REQUESTED (ctype
))
1754 note_debug_info_needed (ctype
);
1758 /* The ABI requires that we emit all of the vtables if we emit any
1760 for (vtbl
= CLASSTYPE_VTABLES (ctype
); vtbl
; vtbl
= TREE_CHAIN (vtbl
))
1762 /* Mark entities references from the virtual table as used. */
1763 mark_vtable_entries (vtbl
);
1765 if (TREE_TYPE (DECL_INITIAL (vtbl
)) == 0)
1767 tree expr
= store_init_value (vtbl
, DECL_INITIAL (vtbl
), LOOKUP_NORMAL
);
1769 /* It had better be all done at compile-time. */
1774 DECL_EXTERNAL (vtbl
) = 0;
1775 rest_of_decl_compilation (vtbl
, 1, 1);
1777 /* Because we're only doing syntax-checking, we'll never end up
1778 actually marking the variable as written. */
1779 if (flag_syntax_only
)
1780 TREE_ASM_WRITTEN (vtbl
) = 1;
1783 /* Since we're writing out the vtable here, also write the debug
1785 note_debug_info_needed (ctype
);
1790 /* A special return value from type_visibility meaning internal
1793 enum { VISIBILITY_ANON
= VISIBILITY_INTERNAL
+1 };
1795 /* walk_tree helper function for type_visibility. */
1798 min_vis_r (tree
*tp
, int *walk_subtrees
, void *data
)
1800 int *vis_p
= (int *)data
;
1805 else if (CLASS_TYPE_P (*tp
))
1807 if (!TREE_PUBLIC (TYPE_MAIN_DECL (*tp
)))
1809 *vis_p
= VISIBILITY_ANON
;
1812 else if (CLASSTYPE_VISIBILITY (*tp
) > *vis_p
)
1813 *vis_p
= CLASSTYPE_VISIBILITY (*tp
);
1818 /* Returns the visibility of TYPE, which is the minimum visibility of its
1822 type_visibility (tree type
)
1824 int vis
= VISIBILITY_DEFAULT
;
1825 cp_walk_tree_without_duplicates (&type
, min_vis_r
, &vis
);
1829 /* Limit the visibility of DECL to VISIBILITY, if not explicitly
1830 specified (or if VISIBILITY is static). */
1833 constrain_visibility (tree decl
, int visibility
)
1835 if (visibility
== VISIBILITY_ANON
)
1837 /* extern "C" declarations aren't affected by the anonymous
1839 if (!DECL_EXTERN_C_P (decl
))
1841 TREE_PUBLIC (decl
) = 0;
1842 DECL_ONE_ONLY (decl
) = 0;
1843 DECL_INTERFACE_KNOWN (decl
) = 1;
1844 if (DECL_LANG_SPECIFIC (decl
))
1845 DECL_NOT_REALLY_EXTERN (decl
) = 1;
1848 else if (visibility
> DECL_VISIBILITY (decl
)
1849 && !DECL_VISIBILITY_SPECIFIED (decl
))
1851 DECL_VISIBILITY (decl
) = (enum symbol_visibility
) visibility
;
1857 /* Constrain the visibility of DECL based on the visibility of its template
1861 constrain_visibility_for_template (tree decl
, tree targs
)
1863 /* If this is a template instantiation, check the innermost
1864 template args for visibility constraints. The outer template
1865 args are covered by the class check. */
1866 tree args
= INNERMOST_TEMPLATE_ARGS (targs
);
1868 for (i
= TREE_VEC_LENGTH (args
); i
> 0; --i
)
1872 tree arg
= TREE_VEC_ELT (args
, i
-1);
1874 vis
= type_visibility (arg
);
1875 else if (TREE_TYPE (arg
) && POINTER_TYPE_P (TREE_TYPE (arg
)))
1878 if (TREE_CODE (arg
) == ADDR_EXPR
)
1879 arg
= TREE_OPERAND (arg
, 0);
1880 if (TREE_CODE (arg
) == VAR_DECL
1881 || TREE_CODE (arg
) == FUNCTION_DECL
)
1883 if (! TREE_PUBLIC (arg
))
1884 vis
= VISIBILITY_ANON
;
1886 vis
= DECL_VISIBILITY (arg
);
1890 constrain_visibility (decl
, vis
);
1894 /* Like c_determine_visibility, but with additional C++-specific
1897 Function-scope entities can rely on the function's visibility because
1898 it is set in start_preparsed_function.
1900 Class-scope entities cannot rely on the class's visibility until the end
1901 of the enclosing class definition.
1903 Note that because namespaces have multiple independent definitions,
1904 namespace visibility is handled elsewhere using the #pragma visibility
1905 machinery rather than by decorating the namespace declaration.
1907 The goal is for constraints from the type to give a diagnostic, and
1908 other constraints to be applied silently. */
1911 determine_visibility (tree decl
)
1913 tree class_type
= NULL_TREE
;
1915 bool orig_visibility_specified
;
1916 enum symbol_visibility orig_visibility
;
1918 /* Remember that all decls get VISIBILITY_DEFAULT when built. */
1920 /* Only relevant for names with external linkage. */
1921 if (!TREE_PUBLIC (decl
))
1924 /* Cloned constructors and destructors get the same visibility as
1925 the underlying function. That should be set up in
1926 maybe_clone_body. */
1927 gcc_assert (!DECL_CLONED_FUNCTION_P (decl
));
1929 orig_visibility_specified
= DECL_VISIBILITY_SPECIFIED (decl
);
1930 orig_visibility
= DECL_VISIBILITY (decl
);
1932 if (TREE_CODE (decl
) == TYPE_DECL
)
1934 if (CLASS_TYPE_P (TREE_TYPE (decl
)))
1935 use_template
= CLASSTYPE_USE_TEMPLATE (TREE_TYPE (decl
));
1936 else if (TYPE_TEMPLATE_INFO (TREE_TYPE (decl
)))
1941 else if (DECL_LANG_SPECIFIC (decl
))
1942 use_template
= DECL_USE_TEMPLATE (decl
);
1946 /* If DECL is a member of a class, visibility specifiers on the
1947 class can influence the visibility of the DECL. */
1948 if (DECL_CLASS_SCOPE_P (decl
))
1949 class_type
= DECL_CONTEXT (decl
);
1952 /* Not a class member. */
1954 /* Virtual tables have DECL_CONTEXT set to their associated class,
1955 so they are automatically handled above. */
1956 gcc_assert (TREE_CODE (decl
) != VAR_DECL
1957 || !DECL_VTABLE_OR_VTT_P (decl
));
1959 if (DECL_FUNCTION_SCOPE_P (decl
) && ! DECL_VISIBILITY_SPECIFIED (decl
))
1961 /* Local statics and classes get the visibility of their
1962 containing function by default, except that
1963 -fvisibility-inlines-hidden doesn't affect them. */
1964 tree fn
= DECL_CONTEXT (decl
);
1965 if (DECL_VISIBILITY_SPECIFIED (fn
) || ! DECL_CLASS_SCOPE_P (fn
))
1967 DECL_VISIBILITY (decl
) = DECL_VISIBILITY (fn
);
1968 DECL_VISIBILITY_SPECIFIED (decl
) =
1969 DECL_VISIBILITY_SPECIFIED (fn
);
1972 determine_visibility_from_class (decl
, DECL_CONTEXT (fn
));
1974 /* Local classes in templates have CLASSTYPE_USE_TEMPLATE set,
1975 but have no TEMPLATE_INFO, so don't try to check it. */
1978 else if (TREE_CODE (decl
) == VAR_DECL
&& DECL_TINFO_P (decl
)
1979 && flag_visibility_ms_compat
)
1981 /* Under -fvisibility-ms-compat, types are visible by default,
1982 even though their contents aren't. */
1983 tree underlying_type
= TREE_TYPE (DECL_NAME (decl
));
1984 int underlying_vis
= type_visibility (underlying_type
);
1985 if (underlying_vis
== VISIBILITY_ANON
1986 || CLASSTYPE_VISIBILITY_SPECIFIED (underlying_type
))
1987 constrain_visibility (decl
, underlying_vis
);
1989 DECL_VISIBILITY (decl
) = VISIBILITY_DEFAULT
;
1991 else if (TREE_CODE (decl
) == VAR_DECL
&& DECL_TINFO_P (decl
))
1993 /* tinfo visibility is based on the type it's for. */
1994 constrain_visibility
1995 (decl
, type_visibility (TREE_TYPE (DECL_NAME (decl
))));
1997 /* Give the target a chance to override the visibility associated
1999 if (TREE_PUBLIC (decl
)
2000 && !DECL_REALLY_EXTERN (decl
)
2001 && CLASS_TYPE_P (TREE_TYPE (DECL_NAME (decl
)))
2002 && !CLASSTYPE_VISIBILITY_SPECIFIED (TREE_TYPE (DECL_NAME (decl
))))
2003 targetm
.cxx
.determine_class_data_visibility (decl
);
2005 else if (use_template
)
2006 /* Template instantiations and specializations get visibility based
2007 on their template unless they override it with an attribute. */;
2008 else if (! DECL_VISIBILITY_SPECIFIED (decl
))
2010 /* Set default visibility to whatever the user supplied with
2011 #pragma GCC visibility or a namespace visibility attribute. */
2012 DECL_VISIBILITY (decl
) = default_visibility
;
2013 DECL_VISIBILITY_SPECIFIED (decl
) = visibility_options
.inpragma
;
2019 /* If the specialization doesn't specify visibility, use the
2020 visibility from the template. */
2021 tree tinfo
= (TREE_CODE (decl
) == TYPE_DECL
2022 ? TYPE_TEMPLATE_INFO (TREE_TYPE (decl
))
2023 : DECL_TEMPLATE_INFO (decl
));
2024 tree args
= TI_ARGS (tinfo
);
2026 if (args
!= error_mark_node
)
2028 int depth
= TMPL_ARGS_DEPTH (args
);
2029 tree pattern
= DECL_TEMPLATE_RESULT (TI_TEMPLATE (tinfo
));
2031 if (!DECL_VISIBILITY_SPECIFIED (decl
))
2033 DECL_VISIBILITY (decl
) = DECL_VISIBILITY (pattern
);
2034 DECL_VISIBILITY_SPECIFIED (decl
)
2035 = DECL_VISIBILITY_SPECIFIED (pattern
);
2038 /* FIXME should TMPL_ARGS_DEPTH really return 1 for null input? */
2039 if (args
&& depth
> template_class_depth (class_type
))
2040 /* Limit visibility based on its template arguments. */
2041 constrain_visibility_for_template (decl
, args
);
2046 determine_visibility_from_class (decl
, class_type
);
2048 if (decl_anon_ns_mem_p (decl
))
2049 /* Names in an anonymous namespace get internal linkage.
2050 This might change once we implement export. */
2051 constrain_visibility (decl
, VISIBILITY_ANON
);
2052 else if (TREE_CODE (decl
) != TYPE_DECL
)
2054 /* Propagate anonymity from type to decl. */
2055 int tvis
= type_visibility (TREE_TYPE (decl
));
2056 if (tvis
== VISIBILITY_ANON
2057 || ! DECL_VISIBILITY_SPECIFIED (decl
))
2058 constrain_visibility (decl
, tvis
);
2061 /* If visibility changed and DECL already has DECL_RTL, ensure
2062 symbol flags are updated. */
2063 if ((DECL_VISIBILITY (decl
) != orig_visibility
2064 || DECL_VISIBILITY_SPECIFIED (decl
) != orig_visibility_specified
)
2065 && ((TREE_CODE (decl
) == VAR_DECL
&& TREE_STATIC (decl
))
2066 || TREE_CODE (decl
) == FUNCTION_DECL
)
2067 && DECL_RTL_SET_P (decl
))
2068 make_decl_rtl (decl
);
2071 /* By default, static data members and function members receive
2072 the visibility of their containing class. */
2075 determine_visibility_from_class (tree decl
, tree class_type
)
2077 if (DECL_VISIBILITY_SPECIFIED (decl
))
2080 if (visibility_options
.inlines_hidden
2081 /* Don't do this for inline templates; specializations might not be
2082 inline, and we don't want them to inherit the hidden
2083 visibility. We'll set it here for all inline instantiations. */
2084 && !processing_template_decl
2085 && TREE_CODE (decl
) == FUNCTION_DECL
2086 && DECL_DECLARED_INLINE_P (decl
)
2087 && (! DECL_LANG_SPECIFIC (decl
)
2088 || ! DECL_EXPLICIT_INSTANTIATION (decl
)))
2089 DECL_VISIBILITY (decl
) = VISIBILITY_HIDDEN
;
2092 /* Default to the class visibility. */
2093 DECL_VISIBILITY (decl
) = CLASSTYPE_VISIBILITY (class_type
);
2094 DECL_VISIBILITY_SPECIFIED (decl
)
2095 = CLASSTYPE_VISIBILITY_SPECIFIED (class_type
);
2098 /* Give the target a chance to override the visibility associated
2100 if (TREE_CODE (decl
) == VAR_DECL
2101 && (DECL_TINFO_P (decl
)
2102 || (DECL_VTABLE_OR_VTT_P (decl
)
2103 /* Construction virtual tables are not exported because
2104 they cannot be referred to from other object files;
2105 their name is not standardized by the ABI. */
2106 && !DECL_CONSTRUCTION_VTABLE_P (decl
)))
2107 && TREE_PUBLIC (decl
)
2108 && !DECL_REALLY_EXTERN (decl
)
2109 && !CLASSTYPE_VISIBILITY_SPECIFIED (class_type
))
2110 targetm
.cxx
.determine_class_data_visibility (decl
);
2113 /* Constrain the visibility of a class TYPE based on the visibility of its
2114 field types. Warn if any fields require lesser visibility. */
2117 constrain_class_visibility (tree type
)
2123 int vis
= type_visibility (type
);
2125 if (vis
== VISIBILITY_ANON
2126 || DECL_IN_SYSTEM_HEADER (TYPE_MAIN_DECL (type
)))
2129 /* Don't warn about visibility if the class has explicit visibility. */
2130 if (CLASSTYPE_VISIBILITY_SPECIFIED (type
))
2131 vis
= VISIBILITY_INTERNAL
;
2133 for (t
= TYPE_FIELDS (type
); t
; t
= TREE_CHAIN (t
))
2134 if (TREE_CODE (t
) == FIELD_DECL
&& TREE_TYPE (t
) != error_mark_node
)
2136 tree ftype
= strip_pointer_or_array_types (TREE_TYPE (t
));
2137 int subvis
= type_visibility (ftype
);
2139 if (subvis
== VISIBILITY_ANON
)
2141 if (!in_main_input_context ())
2143 %qT has a field %qD whose type uses the anonymous namespace",
2146 else if (MAYBE_CLASS_TYPE_P (ftype
)
2147 && vis
< VISIBILITY_HIDDEN
2148 && subvis
>= VISIBILITY_HIDDEN
)
2149 warning (OPT_Wattributes
, "\
2150 %qT declared with greater visibility than the type of its field %qD",
2154 binfo
= TYPE_BINFO (type
);
2155 for (i
= 0; BINFO_BASE_ITERATE (binfo
, i
, t
); ++i
)
2157 int subvis
= type_visibility (TREE_TYPE (t
));
2159 if (subvis
== VISIBILITY_ANON
)
2161 if (!in_main_input_context())
2163 %qT has a base %qT whose type uses the anonymous namespace",
2164 type
, TREE_TYPE (t
));
2166 else if (vis
< VISIBILITY_HIDDEN
2167 && subvis
>= VISIBILITY_HIDDEN
)
2168 warning (OPT_Wattributes
, "\
2169 %qT declared with greater visibility than its base %qT",
2170 type
, TREE_TYPE (t
));
2174 /* DECL is a FUNCTION_DECL or VAR_DECL. If the object file linkage
2175 for DECL has not already been determined, do so now by setting
2176 DECL_EXTERNAL, DECL_COMDAT and other related flags. Until this
2177 function is called entities with vague linkage whose definitions
2178 are available must have TREE_PUBLIC set.
2180 If this function decides to place DECL in COMDAT, it will set
2181 appropriate flags -- but will not clear DECL_EXTERNAL. It is up to
2182 the caller to decide whether or not to clear DECL_EXTERNAL. Some
2183 callers defer that decision until it is clear that DECL is actually
2187 import_export_decl (tree decl
)
2192 tree class_type
= NULL_TREE
;
2194 if (DECL_INTERFACE_KNOWN (decl
))
2197 /* We cannot determine what linkage to give to an entity with vague
2198 linkage until the end of the file. For example, a virtual table
2199 for a class will be defined if and only if the key method is
2200 defined in this translation unit. As a further example, consider
2201 that when compiling a translation unit that uses PCH file with
2202 "-frepo" it would be incorrect to make decisions about what
2203 entities to emit when building the PCH; those decisions must be
2204 delayed until the repository information has been processed. */
2205 gcc_assert (at_eof
);
2206 /* Object file linkage for explicit instantiations is handled in
2207 mark_decl_instantiated. For static variables in functions with
2208 vague linkage, maybe_commonize_var is used.
2210 Therefore, the only declarations that should be provided to this
2211 function are those with external linkage that are:
2213 * implicit instantiations of function templates
2217 * implicit instantiations of static data members of class
2224 Furthermore, all entities that reach this point must have a
2225 definition available in this translation unit.
2227 The following assertions check these conditions. */
2228 gcc_assert (TREE_CODE (decl
) == FUNCTION_DECL
2229 || TREE_CODE (decl
) == VAR_DECL
);
2230 /* Any code that creates entities with TREE_PUBLIC cleared should
2231 also set DECL_INTERFACE_KNOWN. */
2232 gcc_assert (TREE_PUBLIC (decl
));
2233 if (TREE_CODE (decl
) == FUNCTION_DECL
)
2234 gcc_assert (DECL_IMPLICIT_INSTANTIATION (decl
)
2235 || DECL_FRIEND_PSEUDO_TEMPLATE_INSTANTIATION (decl
)
2236 || DECL_DECLARED_INLINE_P (decl
));
2238 gcc_assert (DECL_IMPLICIT_INSTANTIATION (decl
)
2239 || DECL_VTABLE_OR_VTT_P (decl
)
2240 || DECL_TINFO_P (decl
));
2241 /* Check that a definition of DECL is available in this translation
2243 gcc_assert (!DECL_REALLY_EXTERN (decl
));
2245 /* Assume that DECL will not have COMDAT linkage. */
2247 /* Assume that DECL will not be imported into this translation
2251 /* See if the repository tells us whether or not to emit DECL in
2252 this translation unit. */
2253 emit_p
= repo_emit_p (decl
);
2256 else if (emit_p
== 1)
2258 /* The repository indicates that this entity should be defined
2259 here. Make sure the back end honors that request. */
2260 if (TREE_CODE (decl
) == VAR_DECL
)
2262 else if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (decl
)
2263 || DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P (decl
))
2266 FOR_EACH_CLONE (clone
, decl
)
2267 mark_needed (clone
);
2271 /* Output the definition as an ordinary strong definition. */
2272 DECL_EXTERNAL (decl
) = 0;
2273 DECL_INTERFACE_KNOWN (decl
) = 1;
2278 /* We have already decided what to do with this DECL; there is no
2279 need to check anything further. */
2281 else if (TREE_CODE (decl
) == VAR_DECL
&& DECL_VTABLE_OR_VTT_P (decl
))
2283 class_type
= DECL_CONTEXT (decl
);
2284 import_export_class (class_type
);
2285 if (TYPE_FOR_JAVA (class_type
))
2287 else if (CLASSTYPE_INTERFACE_KNOWN (class_type
)
2288 && CLASSTYPE_INTERFACE_ONLY (class_type
))
2290 else if ((!flag_weak
|| TARGET_WEAK_NOT_IN_ARCHIVE_TOC
)
2291 && !CLASSTYPE_USE_TEMPLATE (class_type
)
2292 && CLASSTYPE_KEY_METHOD (class_type
)
2293 && !DECL_DECLARED_INLINE_P (CLASSTYPE_KEY_METHOD (class_type
)))
2294 /* The ABI requires that all virtual tables be emitted with
2295 COMDAT linkage. However, on systems where COMDAT symbols
2296 don't show up in the table of contents for a static
2297 archive, or on systems without weak symbols (where we
2298 approximate COMDAT linkage by using internal linkage), the
2299 linker will report errors about undefined symbols because
2300 it will not see the virtual table definition. Therefore,
2301 in the case that we know that the virtual table will be
2302 emitted in only one translation unit, we make the virtual
2303 table an ordinary definition with external linkage. */
2304 DECL_EXTERNAL (decl
) = 0;
2305 else if (CLASSTYPE_INTERFACE_KNOWN (class_type
))
2307 /* CLASS_TYPE is being exported from this translation unit,
2308 so DECL should be defined here. */
2309 if (!flag_weak
&& CLASSTYPE_EXPLICIT_INSTANTIATION (class_type
))
2310 /* If a class is declared in a header with the "extern
2311 template" extension, then it will not be instantiated,
2312 even in translation units that would normally require
2313 it. Often such classes are explicitly instantiated in
2314 one translation unit. Therefore, the explicit
2315 instantiation must be made visible to other translation
2317 DECL_EXTERNAL (decl
) = 0;
2320 /* The generic C++ ABI says that class data is always
2321 COMDAT, even if there is a key function. Some
2322 variants (e.g., the ARM EABI) says that class data
2323 only has COMDAT linkage if the class data might be
2324 emitted in more than one translation unit. When the
2325 key method can be inline and is inline, we still have
2326 to arrange for comdat even though
2327 class_data_always_comdat is false. */
2328 if (!CLASSTYPE_KEY_METHOD (class_type
)
2329 || DECL_DECLARED_INLINE_P (CLASSTYPE_KEY_METHOD (class_type
))
2330 || targetm
.cxx
.class_data_always_comdat ())
2332 /* The ABI requires COMDAT linkage. Normally, we
2333 only emit COMDAT things when they are needed;
2334 make sure that we realize that this entity is
2341 else if (!flag_implicit_templates
2342 && CLASSTYPE_IMPLICIT_INSTANTIATION (class_type
))
2347 else if (TREE_CODE (decl
) == VAR_DECL
&& DECL_TINFO_P (decl
))
2349 tree type
= TREE_TYPE (DECL_NAME (decl
));
2350 if (CLASS_TYPE_P (type
))
2353 import_export_class (type
);
2354 if (CLASSTYPE_INTERFACE_KNOWN (type
)
2355 && TYPE_POLYMORPHIC_P (type
)
2356 && CLASSTYPE_INTERFACE_ONLY (type
)
2357 /* If -fno-rtti was specified, then we cannot be sure
2358 that RTTI information will be emitted with the
2359 virtual table of the class, so we must emit it
2360 wherever it is used. */
2365 if (CLASSTYPE_INTERFACE_KNOWN (type
)
2366 && !CLASSTYPE_INTERFACE_ONLY (type
))
2368 comdat_p
= (targetm
.cxx
.class_data_always_comdat ()
2369 || (CLASSTYPE_KEY_METHOD (type
)
2370 && DECL_DECLARED_INLINE_P (CLASSTYPE_KEY_METHOD (type
))));
2375 DECL_EXTERNAL (decl
) = 0;
2385 else if (DECL_TEMPLATE_INSTANTIATION (decl
)
2386 || DECL_FRIEND_PSEUDO_TEMPLATE_INSTANTIATION (decl
))
2388 /* DECL is an implicit instantiation of a function or static
2390 if ((flag_implicit_templates
2391 && !flag_use_repository
)
2392 || (flag_implicit_inline_templates
2393 && TREE_CODE (decl
) == FUNCTION_DECL
2394 && DECL_DECLARED_INLINE_P (decl
)))
2397 /* If we are not implicitly generating templates, then mark
2398 this entity as undefined in this translation unit. */
2401 else if (DECL_FUNCTION_MEMBER_P (decl
))
2403 if (!DECL_DECLARED_INLINE_P (decl
))
2405 tree ctype
= DECL_CONTEXT (decl
);
2406 import_export_class (ctype
);
2407 if (CLASSTYPE_INTERFACE_KNOWN (ctype
))
2409 DECL_NOT_REALLY_EXTERN (decl
)
2410 = ! (CLASSTYPE_INTERFACE_ONLY (ctype
)
2411 || (DECL_DECLARED_INLINE_P (decl
)
2412 && ! flag_implement_inlines
2413 && !DECL_VINDEX (decl
)));
2415 if (!DECL_NOT_REALLY_EXTERN (decl
))
2416 DECL_EXTERNAL (decl
) = 1;
2418 /* Always make artificials weak. */
2419 if (DECL_ARTIFICIAL (decl
) && flag_weak
)
2422 maybe_make_one_only (decl
);
2433 /* If we are importing DECL into this translation unit, mark is
2434 an undefined here. */
2435 DECL_EXTERNAL (decl
) = 1;
2436 DECL_NOT_REALLY_EXTERN (decl
) = 0;
2440 /* If we decided to put DECL in COMDAT, mark it accordingly at
2442 comdat_linkage (decl
);
2445 DECL_INTERFACE_KNOWN (decl
) = 1;
2448 /* Return an expression that performs the destruction of DECL, which
2449 must be a VAR_DECL whose type has a non-trivial destructor, or is
2450 an array whose (innermost) elements have a non-trivial destructor. */
2453 build_cleanup (tree decl
)
2456 tree type
= TREE_TYPE (decl
);
2458 /* This function should only be called for declarations that really
2459 require cleanups. */
2460 gcc_assert (!TYPE_HAS_TRIVIAL_DESTRUCTOR (type
));
2462 /* Treat all objects with destructors as used; the destructor may do
2463 something substantive. */
2466 if (TREE_CODE (type
) == ARRAY_TYPE
)
2469 temp
= build_address (decl
);
2470 temp
= build_delete (TREE_TYPE (temp
), temp
,
2471 sfk_complete_destructor
,
2472 LOOKUP_NORMAL
|LOOKUP_NONVIRTUAL
|LOOKUP_DESTRUCTOR
, 0);
2476 /* Returns the initialization guard variable for the variable DECL,
2477 which has static storage duration. */
2480 get_guard (tree decl
)
2485 sname
= mangle_guard_variable (decl
);
2486 guard
= IDENTIFIER_GLOBAL_VALUE (sname
);
2491 /* We use a type that is big enough to contain a mutex as well
2492 as an integer counter. */
2493 guard_type
= targetm
.cxx
.guard_type ();
2494 guard
= build_decl (VAR_DECL
, sname
, guard_type
);
2496 /* The guard should have the same linkage as what it guards. */
2497 TREE_PUBLIC (guard
) = TREE_PUBLIC (decl
);
2498 TREE_STATIC (guard
) = TREE_STATIC (decl
);
2499 DECL_COMMON (guard
) = DECL_COMMON (decl
);
2500 DECL_ONE_ONLY (guard
) = DECL_ONE_ONLY (decl
);
2501 if (TREE_PUBLIC (decl
))
2502 DECL_WEAK (guard
) = DECL_WEAK (decl
);
2503 DECL_VISIBILITY (guard
) = DECL_VISIBILITY (decl
);
2504 DECL_VISIBILITY_SPECIFIED (guard
) = DECL_VISIBILITY_SPECIFIED (decl
);
2506 DECL_ARTIFICIAL (guard
) = 1;
2507 DECL_IGNORED_P (guard
) = 1;
2508 TREE_USED (guard
) = 1;
2509 pushdecl_top_level_and_finish (guard
, NULL_TREE
);
2514 /* Return those bits of the GUARD variable that should be set when the
2515 guarded entity is actually initialized. */
2518 get_guard_bits (tree guard
)
2520 if (!targetm
.cxx
.guard_mask_bit ())
2522 /* We only set the first byte of the guard, in order to leave room
2523 for a mutex in the high-order bits. */
2524 guard
= build1 (ADDR_EXPR
,
2525 build_pointer_type (TREE_TYPE (guard
)),
2527 guard
= build1 (NOP_EXPR
,
2528 build_pointer_type (char_type_node
),
2530 guard
= build1 (INDIRECT_REF
, char_type_node
, guard
);
2536 /* Return an expression which determines whether or not the GUARD
2537 variable has already been initialized. */
2540 get_guard_cond (tree guard
)
2544 /* Check to see if the GUARD is zero. */
2545 guard
= get_guard_bits (guard
);
2547 /* Mask off all but the low bit. */
2548 if (targetm
.cxx
.guard_mask_bit ())
2550 guard_value
= integer_one_node
;
2551 if (!same_type_p (TREE_TYPE (guard_value
), TREE_TYPE (guard
)))
2552 guard_value
= convert (TREE_TYPE (guard
), guard_value
);
2553 guard
= cp_build_binary_op (input_location
,
2554 BIT_AND_EXPR
, guard
, guard_value
,
2555 tf_warning_or_error
);
2558 guard_value
= integer_zero_node
;
2559 if (!same_type_p (TREE_TYPE (guard_value
), TREE_TYPE (guard
)))
2560 guard_value
= convert (TREE_TYPE (guard
), guard_value
);
2561 return cp_build_binary_op (input_location
,
2562 EQ_EXPR
, guard
, guard_value
,
2563 tf_warning_or_error
);
2566 /* Return an expression which sets the GUARD variable, indicating that
2567 the variable being guarded has been initialized. */
2570 set_guard (tree guard
)
2574 /* Set the GUARD to one. */
2575 guard
= get_guard_bits (guard
);
2576 guard_init
= integer_one_node
;
2577 if (!same_type_p (TREE_TYPE (guard_init
), TREE_TYPE (guard
)))
2578 guard_init
= convert (TREE_TYPE (guard
), guard_init
);
2579 return cp_build_modify_expr (guard
, NOP_EXPR
, guard_init
,
2580 tf_warning_or_error
);
2583 /* Start the process of running a particular set of global constructors
2584 or destructors. Subroutine of do_[cd]tors. */
2587 start_objects (int method_type
, int initp
)
2593 /* Make ctor or dtor function. METHOD_TYPE may be 'I' or 'D'. */
2595 if (initp
!= DEFAULT_INIT_PRIORITY
)
2605 sprintf (type
, "%c%c%.5u", method_type
, joiner
, initp
);
2608 sprintf (type
, "%c", method_type
);
2610 fndecl
= build_lang_decl (FUNCTION_DECL
,
2611 get_file_function_name (type
),
2612 build_function_type (void_type_node
,
2614 start_preparsed_function (fndecl
, /*attrs=*/NULL_TREE
, SF_PRE_PARSED
);
2616 TREE_PUBLIC (current_function_decl
) = 0;
2618 /* Mark as artificial because it's not explicitly in the user's
2620 DECL_ARTIFICIAL (current_function_decl
) = 1;
2622 /* Mark this declaration as used to avoid spurious warnings. */
2623 TREE_USED (current_function_decl
) = 1;
2625 /* Mark this function as a global constructor or destructor. */
2626 if (method_type
== 'I')
2627 DECL_GLOBAL_CTOR_P (current_function_decl
) = 1;
2629 DECL_GLOBAL_DTOR_P (current_function_decl
) = 1;
2630 DECL_LANG_SPECIFIC (current_function_decl
)->decl_flags
.u2sel
= 1;
2632 body
= begin_compound_stmt (BCS_FN_BODY
);
2637 /* Finish the process of running a particular set of global constructors
2638 or destructors. Subroutine of do_[cd]tors. */
2641 finish_objects (int method_type
, int initp
, tree body
)
2646 finish_compound_stmt (body
);
2647 fn
= finish_function (0);
2649 if (method_type
== 'I')
2651 DECL_STATIC_CONSTRUCTOR (fn
) = 1;
2652 decl_init_priority_insert (fn
, initp
);
2656 DECL_STATIC_DESTRUCTOR (fn
) = 1;
2657 decl_fini_priority_insert (fn
, initp
);
2660 expand_or_defer_fn (fn
);
2663 /* The names of the parameters to the function created to handle
2664 initializations and destructions for objects with static storage
2666 #define INITIALIZE_P_IDENTIFIER "__initialize_p"
2667 #define PRIORITY_IDENTIFIER "__priority"
2669 /* The name of the function we create to handle initializations and
2670 destructions for objects with static storage duration. */
2671 #define SSDF_IDENTIFIER "__static_initialization_and_destruction"
2673 /* The declaration for the __INITIALIZE_P argument. */
2674 static GTY(()) tree initialize_p_decl
;
2676 /* The declaration for the __PRIORITY argument. */
2677 static GTY(()) tree priority_decl
;
2679 /* The declaration for the static storage duration function. */
2680 static GTY(()) tree ssdf_decl
;
2682 /* All the static storage duration functions created in this
2683 translation unit. */
2684 static GTY(()) VEC(tree
,gc
) *ssdf_decls
;
2686 /* A map from priority levels to information about that priority
2687 level. There may be many such levels, so efficient lookup is
2689 static splay_tree priority_info_map
;
2691 /* Begins the generation of the function that will handle all
2692 initialization and destruction of objects with static storage
2693 duration. The function generated takes two parameters of type
2694 `int': __INITIALIZE_P and __PRIORITY. If __INITIALIZE_P is
2695 nonzero, it performs initializations. Otherwise, it performs
2696 destructions. It only performs those initializations or
2697 destructions with the indicated __PRIORITY. The generated function
2700 It is assumed that this function will only be called once per
2701 translation unit. */
2704 start_static_storage_duration_function (unsigned count
)
2709 char id
[sizeof (SSDF_IDENTIFIER
) + 1 /* '\0' */ + 32];
2711 /* Create the identifier for this function. It will be of the form
2712 SSDF_IDENTIFIER_<number>. */
2713 sprintf (id
, "%s_%u", SSDF_IDENTIFIER
, count
);
2715 /* Create the parameters. */
2716 parm_types
= void_list_node
;
2717 parm_types
= tree_cons (NULL_TREE
, integer_type_node
, parm_types
);
2718 parm_types
= tree_cons (NULL_TREE
, integer_type_node
, parm_types
);
2719 type
= build_function_type (void_type_node
, parm_types
);
2721 /* Create the FUNCTION_DECL itself. */
2722 ssdf_decl
= build_lang_decl (FUNCTION_DECL
,
2723 get_identifier (id
),
2725 TREE_PUBLIC (ssdf_decl
) = 0;
2726 DECL_ARTIFICIAL (ssdf_decl
) = 1;
2728 /* Put this function in the list of functions to be called from the
2729 static constructors and destructors. */
2732 ssdf_decls
= VEC_alloc (tree
, gc
, 32);
2734 /* Take this opportunity to initialize the map from priority
2735 numbers to information about that priority level. */
2736 priority_info_map
= splay_tree_new (splay_tree_compare_ints
,
2737 /*delete_key_fn=*/0,
2738 /*delete_value_fn=*/
2739 (splay_tree_delete_value_fn
) &free
);
2741 /* We always need to generate functions for the
2742 DEFAULT_INIT_PRIORITY so enter it now. That way when we walk
2743 priorities later, we'll be sure to find the
2744 DEFAULT_INIT_PRIORITY. */
2745 get_priority_info (DEFAULT_INIT_PRIORITY
);
2748 VEC_safe_push (tree
, gc
, ssdf_decls
, ssdf_decl
);
2750 /* Create the argument list. */
2751 initialize_p_decl
= cp_build_parm_decl
2752 (get_identifier (INITIALIZE_P_IDENTIFIER
), integer_type_node
);
2753 DECL_CONTEXT (initialize_p_decl
) = ssdf_decl
;
2754 TREE_USED (initialize_p_decl
) = 1;
2755 priority_decl
= cp_build_parm_decl
2756 (get_identifier (PRIORITY_IDENTIFIER
), integer_type_node
);
2757 DECL_CONTEXT (priority_decl
) = ssdf_decl
;
2758 TREE_USED (priority_decl
) = 1;
2760 TREE_CHAIN (initialize_p_decl
) = priority_decl
;
2761 DECL_ARGUMENTS (ssdf_decl
) = initialize_p_decl
;
2763 /* Put the function in the global scope. */
2764 pushdecl (ssdf_decl
);
2766 /* Start the function itself. This is equivalent to declaring the
2769 static void __ssdf (int __initialize_p, init __priority_p);
2771 It is static because we only need to call this function from the
2772 various constructor and destructor functions for this module. */
2773 start_preparsed_function (ssdf_decl
,
2774 /*attrs=*/NULL_TREE
,
2777 /* Set up the scope of the outermost block in the function. */
2778 body
= begin_compound_stmt (BCS_FN_BODY
);
2783 /* Finish the generation of the function which performs initialization
2784 and destruction of objects with static storage duration. After
2785 this point, no more such objects can be created. */
2788 finish_static_storage_duration_function (tree body
)
2790 /* Close out the function. */
2791 finish_compound_stmt (body
);
2792 expand_or_defer_fn (finish_function (0));
2795 /* Return the information about the indicated PRIORITY level. If no
2796 code to handle this level has yet been generated, generate the
2797 appropriate prologue. */
2799 static priority_info
2800 get_priority_info (int priority
)
2805 n
= splay_tree_lookup (priority_info_map
,
2806 (splay_tree_key
) priority
);
2809 /* Create a new priority information structure, and insert it
2811 pi
= XNEW (struct priority_info_s
);
2812 pi
->initializations_p
= 0;
2813 pi
->destructions_p
= 0;
2814 splay_tree_insert (priority_info_map
,
2815 (splay_tree_key
) priority
,
2816 (splay_tree_value
) pi
);
2819 pi
= (priority_info
) n
->value
;
2824 /* The effective initialization priority of a DECL. */
2826 #define DECL_EFFECTIVE_INIT_PRIORITY(decl) \
2827 ((!DECL_HAS_INIT_PRIORITY_P (decl) || DECL_INIT_PRIORITY (decl) == 0) \
2828 ? DEFAULT_INIT_PRIORITY : DECL_INIT_PRIORITY (decl))
2830 /* Whether a DECL needs a guard to protect it against multiple
2833 #define NEEDS_GUARD_P(decl) (TREE_PUBLIC (decl) && (DECL_COMMON (decl) \
2834 || DECL_ONE_ONLY (decl) \
2835 || DECL_WEAK (decl)))
2837 /* Called from one_static_initialization_or_destruction(),
2839 Walks the initializer list of a global variable and looks for
2840 temporary variables (DECL_NAME() == NULL and DECL_ARTIFICIAL != 0)
2841 and that have their DECL_CONTEXT() == NULL.
2842 For each such temporary variable, set their DECL_CONTEXT() to
2843 the current function. This is necessary because otherwise
2844 some optimizers (enabled by -O2 -fprofile-arcs) might crash
2845 when trying to refer to a temporary variable that does not have
2846 it's DECL_CONTECT() properly set. */
2848 fix_temporary_vars_context_r (tree
*node
,
2849 int *unused ATTRIBUTE_UNUSED
,
2850 void *unused1 ATTRIBUTE_UNUSED
)
2852 gcc_assert (current_function_decl
);
2854 if (TREE_CODE (*node
) == BIND_EXPR
)
2858 for (var
= BIND_EXPR_VARS (*node
); var
; var
= TREE_CHAIN (var
))
2859 if (TREE_CODE (var
) == VAR_DECL
2861 && DECL_ARTIFICIAL (var
)
2862 && !DECL_CONTEXT (var
))
2863 DECL_CONTEXT (var
) = current_function_decl
;
2869 /* Set up to handle the initialization or destruction of DECL. If
2870 INITP is nonzero, we are initializing the variable. Otherwise, we
2871 are destroying it. */
2874 one_static_initialization_or_destruction (tree decl
, tree init
, bool initp
)
2876 tree guard_if_stmt
= NULL_TREE
;
2879 /* If we are supposed to destruct and there's a trivial destructor,
2880 nothing has to be done. */
2882 && TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl
)))
2885 /* Trick the compiler into thinking we are at the file and line
2886 where DECL was declared so that error-messages make sense, and so
2887 that the debugger will show somewhat sensible file and line
2889 input_location
= DECL_SOURCE_LOCATION (decl
);
2891 /* Make sure temporary variables in the initialiser all have
2892 their DECL_CONTEXT() set to a value different from NULL_TREE.
2893 This can happen when global variables initialisers are built.
2894 In that case, the DECL_CONTEXT() of the global variables _AND_ of all
2895 the temporary variables that might have been generated in the
2896 accompagning initialisers is NULL_TREE, meaning the variables have been
2897 declared in the global namespace.
2898 What we want to do here is to fix that and make sure the DECL_CONTEXT()
2899 of the temporaries are set to the current function decl. */
2900 cp_walk_tree_without_duplicates (&init
,
2901 fix_temporary_vars_context_r
,
2908 Access control for implicit calls to the constructors,
2909 the conversion functions, or the destructor called to
2910 create and destroy a static data member is performed as
2911 if these calls appeared in the scope of the member's
2914 we pretend we are in a static member function of the class of
2915 which the DECL is a member. */
2916 if (member_p (decl
))
2918 DECL_CONTEXT (current_function_decl
) = DECL_CONTEXT (decl
);
2919 DECL_STATIC_FUNCTION_P (current_function_decl
) = 1;
2922 /* Assume we don't need a guard. */
2924 /* We need a guard if this is an object with external linkage that
2925 might be initialized in more than one place. (For example, a
2926 static data member of a template, when the data member requires
2928 if (NEEDS_GUARD_P (decl
))
2932 guard
= get_guard (decl
);
2934 /* When using __cxa_atexit, we just check the GUARD as we would
2935 for a local static. */
2936 if (flag_use_cxa_atexit
)
2938 /* When using __cxa_atexit, we never try to destroy
2939 anything from a static destructor. */
2941 guard_cond
= get_guard_cond (guard
);
2943 /* If we don't have __cxa_atexit, then we will be running
2944 destructors from .fini sections, or their equivalents. So,
2945 we need to know how many times we've tried to initialize this
2946 object. We do initializations only if the GUARD is zero,
2947 i.e., if we are the first to initialize the variable. We do
2948 destructions only if the GUARD is one, i.e., if we are the
2949 last to destroy the variable. */
2952 = cp_build_binary_op (input_location
,
2954 cp_build_unary_op (PREINCREMENT_EXPR
,
2957 tf_warning_or_error
),
2959 tf_warning_or_error
);
2962 = cp_build_binary_op (input_location
,
2964 cp_build_unary_op (PREDECREMENT_EXPR
,
2967 tf_warning_or_error
),
2969 tf_warning_or_error
);
2971 guard_if_stmt
= begin_if_stmt ();
2972 finish_if_stmt_cond (guard_cond
, guard_if_stmt
);
2976 /* If we're using __cxa_atexit, we have not already set the GUARD,
2977 so we must do so now. */
2978 if (guard
&& initp
&& flag_use_cxa_atexit
)
2979 finish_expr_stmt (set_guard (guard
));
2981 /* Perform the initialization or destruction. */
2985 finish_expr_stmt (init
);
2987 /* If we're using __cxa_atexit, register a function that calls the
2988 destructor for the object. */
2989 if (flag_use_cxa_atexit
)
2990 finish_expr_stmt (register_dtor_fn (decl
));
2993 finish_expr_stmt (build_cleanup (decl
));
2995 /* Finish the guard if-stmt, if necessary. */
2998 finish_then_clause (guard_if_stmt
);
2999 finish_if_stmt (guard_if_stmt
);
3002 /* Now that we're done with DECL we don't need to pretend to be a
3003 member of its class any longer. */
3004 DECL_CONTEXT (current_function_decl
) = NULL_TREE
;
3005 DECL_STATIC_FUNCTION_P (current_function_decl
) = 0;
3008 /* Generate code to do the initialization or destruction of the decls in VARS,
3009 a TREE_LIST of VAR_DECL with static storage duration.
3010 Whether initialization or destruction is performed is specified by INITP. */
3013 do_static_initialization_or_destruction (tree vars
, bool initp
)
3015 tree node
, init_if_stmt
, cond
;
3017 /* Build the outer if-stmt to check for initialization or destruction. */
3018 init_if_stmt
= begin_if_stmt ();
3019 cond
= initp
? integer_one_node
: integer_zero_node
;
3020 cond
= cp_build_binary_op (input_location
,
3024 tf_warning_or_error
);
3025 finish_if_stmt_cond (cond
, init_if_stmt
);
3029 tree decl
= TREE_VALUE (node
);
3030 tree priority_if_stmt
;
3034 /* If we don't need a destructor, there's nothing to do. Avoid
3035 creating a possibly empty if-stmt. */
3036 if (!initp
&& TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl
)))
3038 node
= TREE_CHAIN (node
);
3042 /* Remember that we had an initialization or finalization at this
3044 priority
= DECL_EFFECTIVE_INIT_PRIORITY (decl
);
3045 pi
= get_priority_info (priority
);
3047 pi
->initializations_p
= 1;
3049 pi
->destructions_p
= 1;
3051 /* Conditionalize this initialization on being in the right priority
3052 and being initializing/finalizing appropriately. */
3053 priority_if_stmt
= begin_if_stmt ();
3054 cond
= cp_build_binary_op (input_location
,
3057 build_int_cst (NULL_TREE
, priority
),
3058 tf_warning_or_error
);
3059 finish_if_stmt_cond (cond
, priority_if_stmt
);
3061 /* Process initializers with same priority. */
3063 && DECL_EFFECTIVE_INIT_PRIORITY (TREE_VALUE (node
)) == priority
;
3064 node
= TREE_CHAIN (node
))
3065 /* Do one initialization or destruction. */
3066 one_static_initialization_or_destruction (TREE_VALUE (node
),
3067 TREE_PURPOSE (node
), initp
);
3069 /* Finish up the priority if-stmt body. */
3070 finish_then_clause (priority_if_stmt
);
3071 finish_if_stmt (priority_if_stmt
);
3075 /* Finish up the init/destruct if-stmt body. */
3076 finish_then_clause (init_if_stmt
);
3077 finish_if_stmt (init_if_stmt
);
3080 /* VARS is a list of variables with static storage duration which may
3081 need initialization and/or finalization. Remove those variables
3082 that don't really need to be initialized or finalized, and return
3083 the resulting list. The order in which the variables appear in
3084 VARS is in reverse order of the order in which they should actually
3085 be initialized. The list we return is in the unreversed order;
3086 i.e., the first variable should be initialized first. */
3089 prune_vars_needing_no_initialization (tree
*vars
)
3092 tree result
= NULL_TREE
;
3097 tree decl
= TREE_VALUE (t
);
3098 tree init
= TREE_PURPOSE (t
);
3100 /* Deal gracefully with error. */
3101 if (decl
== error_mark_node
)
3103 var
= &TREE_CHAIN (t
);
3107 /* The only things that can be initialized are variables. */
3108 gcc_assert (TREE_CODE (decl
) == VAR_DECL
);
3110 /* If this object is not defined, we don't need to do anything
3112 if (DECL_EXTERNAL (decl
))
3114 var
= &TREE_CHAIN (t
);
3118 /* Also, if the initializer already contains errors, we can bail
3120 if (init
&& TREE_CODE (init
) == TREE_LIST
3121 && value_member (error_mark_node
, init
))
3123 var
= &TREE_CHAIN (t
);
3127 /* This variable is going to need initialization and/or
3128 finalization, so we add it to the list. */
3129 *var
= TREE_CHAIN (t
);
3130 TREE_CHAIN (t
) = result
;
3137 /* Make sure we have told the back end about all the variables in
3141 write_out_vars (tree vars
)
3145 for (v
= vars
; v
; v
= TREE_CHAIN (v
))
3147 tree var
= TREE_VALUE (v
);
3148 if (!var_finalized_p (var
))
3150 import_export_decl (var
);
3151 rest_of_decl_compilation (var
, 1, 1);
3156 /* Generate a static constructor (if CONSTRUCTOR_P) or destructor
3157 (otherwise) that will initialize all global objects with static
3158 storage duration having the indicated PRIORITY. */
3161 generate_ctor_or_dtor_function (bool constructor_p
, int priority
,
3170 input_location
= *locus
;
3172 /* Was: locus->line++; */
3174 /* We use `I' to indicate initialization and `D' to indicate
3176 function_key
= constructor_p
? 'I' : 'D';
3178 /* We emit the function lazily, to avoid generating empty
3179 global constructors and destructors. */
3182 /* For Objective-C++, we may need to initialize metadata found in this module.
3183 This must be done _before_ any other static initializations. */
3184 if (c_dialect_objc () && (priority
== DEFAULT_INIT_PRIORITY
)
3185 && constructor_p
&& objc_static_init_needed_p ())
3187 body
= start_objects (function_key
, priority
);
3188 objc_generate_static_init_call (NULL_TREE
);
3191 /* Call the static storage duration function with appropriate
3193 for (i
= 0; VEC_iterate (tree
, ssdf_decls
, i
, fndecl
); ++i
)
3195 /* Calls to pure or const functions will expand to nothing. */
3196 if (! (flags_from_decl_or_type (fndecl
) & (ECF_CONST
| ECF_PURE
)))
3199 body
= start_objects (function_key
, priority
);
3201 arguments
= tree_cons (NULL_TREE
,
3202 build_int_cst (NULL_TREE
, priority
),
3204 arguments
= tree_cons (NULL_TREE
,
3205 build_int_cst (NULL_TREE
, constructor_p
),
3207 finish_expr_stmt (cp_build_function_call (fndecl
, arguments
,
3208 tf_warning_or_error
));
3212 /* Close out the function. */
3214 finish_objects (function_key
, priority
, body
);
3217 /* Generate constructor and destructor functions for the priority
3221 generate_ctor_and_dtor_functions_for_priority (splay_tree_node n
, void * data
)
3223 location_t
*locus
= (location_t
*) data
;
3224 int priority
= (int) n
->key
;
3225 priority_info pi
= (priority_info
) n
->value
;
3227 /* Generate the functions themselves, but only if they are really
3229 if (pi
->initializations_p
)
3230 generate_ctor_or_dtor_function (/*constructor_p=*/true, priority
, locus
);
3231 if (pi
->destructions_p
)
3232 generate_ctor_or_dtor_function (/*constructor_p=*/false, priority
, locus
);
3234 /* Keep iterating. */
3238 /* Called via LANGHOOK_CALLGRAPH_ANALYZE_EXPR. It is supposed to mark
3239 decls referenced from front-end specific constructs; it will be called
3240 only for language-specific tree nodes.
3242 Here we must deal with member pointers. */
3245 cxx_callgraph_analyze_expr (tree
*tp
, int *walk_subtrees ATTRIBUTE_UNUSED
)
3249 switch (TREE_CODE (t
))
3252 if (TYPE_PTRMEMFUNC_P (TREE_TYPE (t
)))
3253 cgraph_mark_address_taken_node (cgraph_node (PTRMEM_CST_MEMBER (t
)));
3256 if (TREE_CODE (BASELINK_FUNCTIONS (t
)) == FUNCTION_DECL
)
3257 cgraph_mark_address_taken_node (cgraph_node (BASELINK_FUNCTIONS (t
)));
3260 if (DECL_VTABLE_OR_VTT_P (t
))
3262 /* The ABI requires that all virtual tables be emitted
3263 whenever one of them is. */
3265 for (vtbl
= CLASSTYPE_VTABLES (DECL_CONTEXT (t
));
3267 vtbl
= TREE_CHAIN (vtbl
))
3268 mark_decl_referenced (vtbl
);
3270 else if (DECL_CONTEXT (t
)
3271 && TREE_CODE (DECL_CONTEXT (t
)) == FUNCTION_DECL
)
3272 /* If we need a static variable in a function, then we
3273 need the containing function. */
3274 mark_decl_referenced (DECL_CONTEXT (t
));
3283 /* Java requires that we be able to reference a local address for a
3284 method, and not be confused by PLT entries. If hidden aliases are
3285 supported, emit one for each java function that we've emitted. */
3288 build_java_method_aliases (void)
3290 struct cgraph_node
*node
;
3292 #ifndef HAVE_GAS_HIDDEN
3296 for (node
= cgraph_nodes
; node
; node
= node
->next
)
3298 tree fndecl
= node
->decl
;
3300 if (TREE_ASM_WRITTEN (fndecl
)
3301 && DECL_CONTEXT (fndecl
)
3302 && TYPE_P (DECL_CONTEXT (fndecl
))
3303 && TYPE_FOR_JAVA (DECL_CONTEXT (fndecl
))
3304 && TARGET_USE_LOCAL_THUNK_ALIAS_P (fndecl
))
3306 /* Mangle the name in a predictable way; we need to reference
3307 this from a java compiled object file. */
3308 tree oid
, nid
, alias
;
3312 oid
= DECL_ASSEMBLER_NAME (fndecl
);
3313 oname
= IDENTIFIER_POINTER (oid
);
3314 gcc_assert (oname
[0] == '_' && oname
[1] == 'Z');
3315 nname
= ACONCAT (("_ZGA", oname
+2, NULL
));
3316 nid
= get_identifier (nname
);
3318 alias
= make_alias_for (fndecl
, nid
);
3319 TREE_PUBLIC (alias
) = 1;
3320 DECL_VISIBILITY (alias
) = VISIBILITY_HIDDEN
;
3322 assemble_alias (alias
, oid
);
3327 /* This routine is called at the end of compilation.
3328 Its job is to create all the code needed to initialize and
3329 destroy the global aggregates. We do the destruction
3330 first, since that way we only need to reverse the decls once. */
3333 cp_write_global_declarations (void)
3339 unsigned ssdf_count
= 0;
3343 locus
= input_location
;
3346 /* Bad parse errors. Just forget about it. */
3347 if (! global_bindings_p () || current_class_type
|| decl_namespace_list
)
3351 c_common_write_pch ();
3353 /* FIXME - huh? was input_line -= 1;*/
3355 /* We now have to write out all the stuff we put off writing out.
3358 o Template specializations that we have not yet instantiated,
3359 but which are needed.
3360 o Initialization and destruction for non-local objects with
3361 static storage duration. (Local objects with static storage
3362 duration are initialized when their scope is first entered,
3363 and are cleaned up via atexit.)
3364 o Virtual function tables.
3366 All of these may cause others to be needed. For example,
3367 instantiating one function may cause another to be needed, and
3368 generating the initializer for an object may cause templates to be
3369 instantiated, etc., etc. */
3371 timevar_push (TV_VARCONST
);
3373 emit_support_tinfos ();
3382 /* If there are templates that we've put off instantiating, do
3384 instantiate_pending_templates (retries
);
3387 /* Write out virtual tables as required. Note that writing out
3388 the virtual table for a template class may cause the
3389 instantiation of members of that class. If we write out
3390 vtables then we remove the class from our list so we don't
3391 have to look at it again. */
3393 while (keyed_classes
!= NULL_TREE
3394 && maybe_emit_vtables (TREE_VALUE (keyed_classes
)))
3397 keyed_classes
= TREE_CHAIN (keyed_classes
);
3403 tree next
= TREE_CHAIN (t
);
3407 if (maybe_emit_vtables (TREE_VALUE (next
)))
3410 TREE_CHAIN (t
) = TREE_CHAIN (next
);
3415 next
= TREE_CHAIN (t
);
3419 /* Write out needed type info variables. We have to be careful
3420 looping through unemitted decls, because emit_tinfo_decl may
3421 cause other variables to be needed. New elements will be
3422 appended, and we remove from the vector those that actually
3424 for (i
= VEC_length (tree
, unemitted_tinfo_decls
);
3425 VEC_iterate (tree
, unemitted_tinfo_decls
, --i
, t
);)
3426 if (emit_tinfo_decl (t
))
3429 VEC_unordered_remove (tree
, unemitted_tinfo_decls
, i
);
3432 /* The list of objects with static storage duration is built up
3433 in reverse order. We clear STATIC_AGGREGATES so that any new
3434 aggregates added during the initialization of these will be
3435 initialized in the correct order when we next come around the
3437 vars
= prune_vars_needing_no_initialization (&static_aggregates
);
3441 /* We need to start a new initialization function each time
3442 through the loop. That's because we need to know which
3443 vtables have been referenced, and TREE_SYMBOL_REFERENCED
3444 isn't computed until a function is finished, and written
3445 out. That's a deficiency in the back end. When this is
3446 fixed, these initialization functions could all become
3447 inline, with resulting performance improvements. */
3450 /* Set the line and file, so that it is obviously not from
3452 input_location
= locus
;
3453 ssdf_body
= start_static_storage_duration_function (ssdf_count
);
3455 /* Make sure the back end knows about all the variables. */
3456 write_out_vars (vars
);
3458 /* First generate code to do all the initializations. */
3460 do_static_initialization_or_destruction (vars
, /*initp=*/true);
3462 /* Then, generate code to do all the destructions. Do these
3463 in reverse order so that the most recently constructed
3464 variable is the first destroyed. If we're using
3465 __cxa_atexit, then we don't need to do this; functions
3466 were registered at initialization time to destroy the
3468 if (!flag_use_cxa_atexit
&& vars
)
3470 vars
= nreverse (vars
);
3471 do_static_initialization_or_destruction (vars
, /*initp=*/false);
3476 /* Finish up the static storage duration function for this
3478 input_location
= locus
;
3479 finish_static_storage_duration_function (ssdf_body
);
3481 /* All those initializations and finalizations might cause
3482 us to need more inline functions, more template
3483 instantiations, etc. */
3486 /* ??? was: locus.line++; */
3489 /* Go through the set of inline functions whose bodies have not
3490 been emitted yet. If out-of-line copies of these functions
3491 are required, emit them. */
3492 for (i
= 0; VEC_iterate (tree
, deferred_fns
, i
, decl
); ++i
)
3494 /* Does it need synthesizing? */
3495 if (DECL_DEFAULTED_FN (decl
) && ! DECL_INITIAL (decl
)
3496 && (! DECL_REALLY_EXTERN (decl
) || possibly_inlined_p (decl
)))
3498 /* Even though we're already at the top-level, we push
3499 there again. That way, when we pop back a few lines
3500 hence, all of our state is restored. Otherwise,
3501 finish_function doesn't clean things up, and we end
3502 up with CURRENT_FUNCTION_DECL set. */
3503 push_to_top_level ();
3504 /* The decl's location will mark where it was first
3505 needed. Save that so synthesize method can indicate
3506 where it was needed from, in case of error */
3507 input_location
= DECL_SOURCE_LOCATION (decl
);
3508 synthesize_method (decl
);
3509 pop_from_top_level ();
3513 if (!gimple_body (decl
))
3516 /* We lie to the back end, pretending that some functions
3517 are not defined when they really are. This keeps these
3518 functions from being put out unnecessarily. But, we must
3519 stop lying when the functions are referenced, or if they
3520 are not comdat since they need to be put out now. If
3521 DECL_INTERFACE_KNOWN, then we have already set
3522 DECL_EXTERNAL appropriately, so there's no need to check
3523 again, and we do not want to clear DECL_EXTERNAL if a
3524 previous call to import_export_decl set it.
3526 This is done in a separate for cycle, because if some
3527 deferred function is contained in another deferred
3528 function later in deferred_fns varray,
3529 rest_of_compilation would skip this function and we
3530 really cannot expand the same function twice. */
3531 import_export_decl (decl
);
3532 if (DECL_NOT_REALLY_EXTERN (decl
)
3533 && DECL_INITIAL (decl
)
3534 && decl_needed_p (decl
))
3535 DECL_EXTERNAL (decl
) = 0;
3537 /* If we're going to need to write this function out, and
3538 there's already a body for it, create RTL for it now.
3539 (There might be no body if this is a method we haven't
3540 gotten around to synthesizing yet.) */
3541 if (!DECL_EXTERNAL (decl
)
3542 && decl_needed_p (decl
)
3543 && !TREE_ASM_WRITTEN (decl
)
3544 && !cgraph_node (decl
)->local
.finalized
)
3546 /* We will output the function; no longer consider it in this
3548 DECL_DEFER_OUTPUT (decl
) = 0;
3549 /* Generate RTL for this function now that we know we
3551 expand_or_defer_fn (decl
);
3552 /* If we're compiling -fsyntax-only pretend that this
3553 function has been written out so that we don't try to
3555 if (flag_syntax_only
)
3556 TREE_ASM_WRITTEN (decl
) = 1;
3561 if (walk_namespaces (wrapup_globals_for_namespace
, /*data=*/0))
3564 /* Static data members are just like namespace-scope globals. */
3565 for (i
= 0; VEC_iterate (tree
, pending_statics
, i
, decl
); ++i
)
3567 if (var_finalized_p (decl
) || DECL_REALLY_EXTERN (decl
)
3568 /* Don't write it out if we haven't seen a definition. */
3569 || DECL_IN_AGGR_P (decl
))
3571 import_export_decl (decl
);
3572 /* If this static data member is needed, provide it to the
3574 if (DECL_NOT_REALLY_EXTERN (decl
) && decl_needed_p (decl
))
3575 DECL_EXTERNAL (decl
) = 0;
3577 if (VEC_length (tree
, pending_statics
) != 0
3578 && wrapup_global_declarations (VEC_address (tree
, pending_statics
),
3579 VEC_length (tree
, pending_statics
)))
3586 /* All used inline functions must have a definition at this point. */
3587 for (i
= 0; VEC_iterate (tree
, deferred_fns
, i
, decl
); ++i
)
3589 if (/* Check online inline functions that were actually used. */
3590 TREE_USED (decl
) && DECL_DECLARED_INLINE_P (decl
)
3591 /* If the definition actually was available here, then the
3592 fact that the function was not defined merely represents
3593 that for some reason (use of a template repository,
3594 #pragma interface, etc.) we decided not to emit the
3596 && !DECL_INITIAL (decl
)
3597 /* An explicit instantiation can be used to specify
3598 that the body is in another unit. It will have
3599 already verified there was a definition. */
3600 && !DECL_EXPLICIT_INSTANTIATION (decl
))
3602 warning (0, "inline function %q+D used but never defined", decl
);
3603 /* Avoid a duplicate warning from check_global_declaration_1. */
3604 TREE_NO_WARNING (decl
) = 1;
3608 /* We give C linkage to static constructors and destructors. */
3609 push_lang_context (lang_name_c
);
3611 /* Generate initialization and destruction functions for all
3612 priorities for which they are required. */
3613 if (priority_info_map
)
3614 splay_tree_foreach (priority_info_map
,
3615 generate_ctor_and_dtor_functions_for_priority
,
3617 else if (c_dialect_objc () && objc_static_init_needed_p ())
3618 /* If this is obj-c++ and we need a static init, call
3619 generate_ctor_or_dtor_function. */
3620 generate_ctor_or_dtor_function (/*constructor_p=*/true,
3621 DEFAULT_INIT_PRIORITY
, &locus
);
3623 /* We're done with the splay-tree now. */
3624 if (priority_info_map
)
3625 splay_tree_delete (priority_info_map
);
3627 /* Generate any missing aliases. */
3628 maybe_apply_pending_pragma_weaks ();
3630 /* We're done with static constructors, so we can go back to "C++"
3632 pop_lang_context ();
3634 cgraph_finalize_compilation_unit ();
3637 /* Now, issue warnings about static, but not defined, functions,
3638 etc., and emit debugging information. */
3639 walk_namespaces (wrapup_globals_for_namespace
, /*data=*/&reconsider
);
3640 if (VEC_length (tree
, pending_statics
) != 0)
3642 check_global_declarations (VEC_address (tree
, pending_statics
),
3643 VEC_length (tree
, pending_statics
));
3644 emit_debug_global_declarations (VEC_address (tree
, pending_statics
),
3645 VEC_length (tree
, pending_statics
));
3648 /* Generate hidden aliases for Java. */
3649 build_java_method_aliases ();
3653 /* The entire file is now complete. If requested, dump everything
3657 FILE *stream
= dump_begin (TDI_tu
, &flags
);
3661 dump_node (global_namespace
, flags
& ~TDF_SLIM
, stream
);
3662 dump_end (TDI_tu
, stream
);
3666 timevar_pop (TV_VARCONST
);
3668 if (flag_detailed_statistics
)
3670 dump_tree_statistics ();
3671 dump_time_statistics ();
3673 input_location
= locus
;
3675 #ifdef ENABLE_CHECKING
3676 validate_conversion_obstack ();
3677 #endif /* ENABLE_CHECKING */
3680 /* FN is an OFFSET_REF, DOTSTAR_EXPR or MEMBER_REF indicating the
3681 function to call in parse-tree form; it has not yet been
3682 semantically analyzed. ARGS are the arguments to the function.
3683 They have already been semantically analyzed. */
3686 build_offset_ref_call_from_tree (tree fn
, tree args
)
3695 object
= TREE_OPERAND (fn
, 0);
3697 if (processing_template_decl
)
3699 gcc_assert (TREE_CODE (fn
) == DOTSTAR_EXPR
3700 || TREE_CODE (fn
) == MEMBER_REF
);
3701 if (type_dependent_expression_p (fn
)
3702 || any_type_dependent_arguments_p (args
))
3703 return build_nt_call_list (fn
, args
);
3705 /* Transform the arguments and add the implicit "this"
3706 parameter. That must be done before the FN is transformed
3707 because we depend on the form of FN. */
3708 args
= build_non_dependent_args (args
);
3709 object
= build_non_dependent_expr (object
);
3710 if (TREE_CODE (fn
) == DOTSTAR_EXPR
)
3711 object
= cp_build_unary_op (ADDR_EXPR
, object
, 0, tf_warning_or_error
);
3712 args
= tree_cons (NULL_TREE
, object
, args
);
3713 /* Now that the arguments are done, transform FN. */
3714 fn
= build_non_dependent_expr (fn
);
3717 /* A qualified name corresponding to a bound pointer-to-member is
3718 represented as an OFFSET_REF:
3720 struct B { void g(); };
3722 void B::g() { (this->*p)(); } */
3723 if (TREE_CODE (fn
) == OFFSET_REF
)
3725 tree object_addr
= cp_build_unary_op (ADDR_EXPR
, object
, 0,
3726 tf_warning_or_error
);
3727 fn
= TREE_OPERAND (fn
, 1);
3728 fn
= get_member_function_from_ptrfunc (&object_addr
, fn
);
3729 args
= tree_cons (NULL_TREE
, object_addr
, args
);
3732 expr
= cp_build_function_call (fn
, args
, tf_warning_or_error
);
3733 if (processing_template_decl
&& expr
!= error_mark_node
)
3734 return build_min_non_dep_call_list (expr
, orig_fn
, orig_args
);
3740 check_default_args (tree x
)
3742 tree arg
= TYPE_ARG_TYPES (TREE_TYPE (x
));
3743 bool saw_def
= false;
3744 int i
= 0 - (TREE_CODE (TREE_TYPE (x
)) == METHOD_TYPE
);
3745 for (; arg
&& arg
!= void_list_node
; arg
= TREE_CHAIN (arg
), ++i
)
3747 if (TREE_PURPOSE (arg
))
3751 error ("default argument missing for parameter %P of %q+#D", i
, x
);
3752 TREE_PURPOSE (arg
) = error_mark_node
;
3757 /* Return true if function DECL can be inlined. This is used to force
3758 instantiation of methods that might be interesting for inlining. */
3760 possibly_inlined_p (tree decl
)
3762 gcc_assert (TREE_CODE (decl
) == FUNCTION_DECL
);
3763 if (DECL_UNINLINABLE (decl
))
3765 if (!optimize
|| pragma_java_exceptions
)
3766 return DECL_DECLARED_INLINE_P (decl
);
3767 /* When optimizing, we might inline everything when flatten
3768 attribute or heuristics inlining for size or autoinlining
3773 /* Mark DECL (either a _DECL or a BASELINK) as "used" in the program.
3774 If DECL is a specialization or implicitly declared class member,
3775 generate the actual definition. */
3778 mark_used (tree decl
)
3780 HOST_WIDE_INT saved_processing_template_decl
= 0;
3782 /* If DECL is a BASELINK for a single function, then treat it just
3783 like the DECL for the function. Otherwise, if the BASELINK is
3784 for an overloaded function, we don't know which function was
3785 actually used until after overload resolution. */
3786 if (TREE_CODE (decl
) == BASELINK
)
3788 decl
= BASELINK_FUNCTIONS (decl
);
3789 if (really_overloaded_fn (decl
))
3791 decl
= OVL_CURRENT (decl
);
3794 TREE_USED (decl
) = 1;
3795 if (DECL_CLONED_FUNCTION_P (decl
))
3796 TREE_USED (DECL_CLONED_FUNCTION (decl
)) = 1;
3797 if (TREE_CODE (decl
) == FUNCTION_DECL
3798 && DECL_DELETED_FN (decl
))
3800 error ("deleted function %q+D", decl
);
3801 error ("used here");
3803 /* If we don't need a value, then we don't need to synthesize DECL. */
3804 if (skip_evaluation
)
3807 /* If within finish_function, defer the rest until that function
3808 finishes, otherwise it might recurse. */
3809 if (defer_mark_used_calls
)
3811 VEC_safe_push (tree
, gc
, deferred_mark_used_calls
, decl
);
3815 /* Normally, we can wait until instantiation-time to synthesize
3816 DECL. However, if DECL is a static data member initialized with
3817 a constant, we need the value right now because a reference to
3818 such a data member is not value-dependent. */
3819 if (TREE_CODE (decl
) == VAR_DECL
3820 && DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl
)
3821 && DECL_CLASS_SCOPE_P (decl
))
3823 /* Don't try to instantiate members of dependent types. We
3824 cannot just use dependent_type_p here because this function
3825 may be called from fold_non_dependent_expr, and then we may
3826 see dependent types, even though processing_template_decl
3828 if (CLASSTYPE_TEMPLATE_INFO ((DECL_CONTEXT (decl
)))
3829 && uses_template_parms (CLASSTYPE_TI_ARGS (DECL_CONTEXT (decl
))))
3831 /* Pretend that we are not in a template, even if we are, so
3832 that the static data member initializer will be processed. */
3833 saved_processing_template_decl
= processing_template_decl
;
3834 processing_template_decl
= 0;
3837 if (processing_template_decl
)
3840 if (TREE_CODE (decl
) == FUNCTION_DECL
&& DECL_DECLARED_INLINE_P (decl
)
3841 && !TREE_ASM_WRITTEN (decl
))
3842 /* Remember it, so we can check it was defined. */
3844 if (DECL_DEFERRED_FN (decl
))
3847 /* Remember the current location for a function we will end up
3848 synthesizing. Then we can inform the user where it was
3849 required in the case of error. */
3850 if (DECL_ARTIFICIAL (decl
) && DECL_NONSTATIC_MEMBER_FUNCTION_P (decl
)
3851 && !DECL_THUNK_P (decl
))
3852 DECL_SOURCE_LOCATION (decl
) = input_location
;
3854 note_vague_linkage_fn (decl
);
3857 /* Is it a synthesized method that needs to be synthesized? */
3858 if (TREE_CODE (decl
) == FUNCTION_DECL
3859 && DECL_NONSTATIC_MEMBER_FUNCTION_P (decl
)
3860 && DECL_DEFAULTED_FN (decl
)
3861 && !DECL_THUNK_P (decl
)
3862 && ! DECL_INITIAL (decl
)
3863 /* Kludge: don't synthesize for default args. Unfortunately this
3864 rules out initializers of namespace-scoped objects too, but
3865 it's sort-of ok if the implicit ctor or dtor decl keeps
3866 pointing to the class location. */
3867 && current_function_decl
)
3869 synthesize_method (decl
);
3870 /* If we've already synthesized the method we don't need to
3871 do the instantiation test below. */
3873 else if ((DECL_NON_THUNK_FUNCTION_P (decl
) || TREE_CODE (decl
) == VAR_DECL
)
3874 && DECL_LANG_SPECIFIC (decl
) && DECL_TEMPLATE_INFO (decl
)
3875 && (!DECL_EXPLICIT_INSTANTIATION (decl
)
3876 || (TREE_CODE (decl
) == FUNCTION_DECL
3877 && possibly_inlined_p
3878 (DECL_TEMPLATE_RESULT (
3879 template_for_substitution (decl
))))
3880 /* We need to instantiate static data members so that there
3881 initializers are available in integral constant
3883 || (TREE_CODE (decl
) == VAR_DECL
3884 && DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl
))))
3885 /* If this is a function or variable that is an instance of some
3886 template, we now know that we will need to actually do the
3887 instantiation. We check that DECL is not an explicit
3888 instantiation because that is not checked in instantiate_decl.
3890 We put off instantiating functions in order to improve compile
3891 times. Maintaining a stack of active functions is expensive,
3892 and the inliner knows to instantiate any functions it might
3893 need. Therefore, we always try to defer instantiation. */
3894 instantiate_decl (decl
, /*defer_ok=*/true,
3895 /*expl_inst_class_mem_p=*/false);
3897 processing_template_decl
= saved_processing_template_decl
;
3900 /* Given function PARM_DECL PARM, return its index in the function's list
3901 of parameters, beginning with 1. */
3904 parm_index (tree parm
)
3909 for (index
= 1, arg
= DECL_ARGUMENTS (DECL_CONTEXT (parm
));
3911 ++index
, arg
= TREE_CHAIN (arg
))
3913 if (DECL_NAME (parm
) == DECL_NAME (arg
))
3915 if (DECL_ARTIFICIAL (arg
))
3923 #include "gt-cp-decl2.h"