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 Free Software Foundation, Inc.
4 Hacked by Michael Tiemann (tiemann@cygnus.com)
6 This file is part of GCC.
8 GCC is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2, or (at your option)
13 GCC is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with GCC; see the file COPYING. If not, write to
20 the Free Software Foundation, 51 Franklin Street, Fifth Floor,
21 Boston, MA 02110-1301, USA. */
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"
55 extern cpp_reader
*parse_in
;
57 /* This structure contains information about the initializations
58 and/or destructions required for a particular priority level. */
59 typedef struct priority_info_s
{
60 /* Nonzero if there have been any initializations at this priority
61 throughout the translation unit. */
62 int initializations_p
;
63 /* Nonzero if there have been any destructions at this priority
64 throughout the translation unit. */
68 static void mark_vtable_entries (tree
);
69 static bool maybe_emit_vtables (tree
);
70 static bool acceptable_java_type (tree
);
71 static tree
start_objects (int, int);
72 static void finish_objects (int, int, tree
);
73 static tree
start_static_storage_duration_function (unsigned);
74 static void finish_static_storage_duration_function (tree
);
75 static priority_info
get_priority_info (int);
76 static void do_static_initialization_or_destruction (tree
, bool);
77 static void one_static_initialization_or_destruction (tree
, tree
, bool);
78 static void generate_ctor_or_dtor_function (bool, int, location_t
*);
79 static int generate_ctor_and_dtor_functions_for_priority (splay_tree_node
,
81 static tree
prune_vars_needing_no_initialization (tree
*);
82 static void write_out_vars (tree
);
83 static void import_export_class (tree
);
84 static tree
get_guard_bits (tree
);
85 static void determine_visibility_from_class (tree
, tree
);
87 /* A list of static class variables. This is needed, because a
88 static class variable can be declared inside the class without
89 an initializer, and then initialized, statically, outside the class. */
90 static GTY(()) VEC(tree
,gc
) *pending_statics
;
92 /* A list of functions which were declared inline, but which we
93 may need to emit outline anyway. */
94 static GTY(()) VEC(tree
,gc
) *deferred_fns
;
96 /* Nonzero if we're done parsing and into end-of-file activities. */
100 /* Functions called along with real static constructors and destructors. */
107 /* Return a member function type (a METHOD_TYPE), given FNTYPE (a
108 FUNCTION_TYPE), CTYPE (class type), and QUALS (the cv-qualifiers
109 that apply to the function). */
112 build_memfn_type (tree fntype
, tree ctype
, cp_cv_quals quals
)
117 if (fntype
== error_mark_node
|| ctype
== error_mark_node
)
118 return error_mark_node
;
120 type_quals
= quals
& ~TYPE_QUAL_RESTRICT
;
121 ctype
= cp_build_qualified_type (ctype
, type_quals
);
122 fntype
= build_method_type_directly (ctype
, TREE_TYPE (fntype
),
123 (TREE_CODE (fntype
) == METHOD_TYPE
124 ? TREE_CHAIN (TYPE_ARG_TYPES (fntype
))
125 : TYPE_ARG_TYPES (fntype
)));
126 raises
= TYPE_RAISES_EXCEPTIONS (fntype
);
128 fntype
= build_exception_variant (fntype
, raises
);
133 /* Build a PARM_DECL with NAME and TYPE, and set DECL_ARG_TYPE
137 cp_build_parm_decl (tree name
, tree type
)
139 tree parm
= build_decl (PARM_DECL
, name
, type
);
140 /* DECL_ARG_TYPE is only used by the back end and the back end never
142 if (!processing_template_decl
)
143 DECL_ARG_TYPE (parm
) = type_passed_as (type
);
147 /* Returns a PARM_DECL for a parameter of the indicated TYPE, with the
151 build_artificial_parm (tree name
, tree type
)
153 tree parm
= cp_build_parm_decl (name
, type
);
154 DECL_ARTIFICIAL (parm
) = 1;
155 /* All our artificial parms are implicitly `const'; they cannot be
157 TREE_READONLY (parm
) = 1;
161 /* Constructors for types with virtual baseclasses need an "in-charge" flag
162 saying whether this constructor is responsible for initialization of
163 virtual baseclasses or not. All destructors also need this "in-charge"
164 flag, which additionally determines whether or not the destructor should
165 free the memory for the object.
167 This function adds the "in-charge" flag to member function FN if
168 appropriate. It is called from grokclassfn and tsubst.
169 FN must be either a constructor or destructor.
171 The in-charge flag follows the 'this' parameter, and is followed by the
172 VTT parm (if any), then the user-written parms. */
175 maybe_retrofit_in_chrg (tree fn
)
177 tree basetype
, arg_types
, parms
, parm
, fntype
;
179 /* If we've already add the in-charge parameter don't do it again. */
180 if (DECL_HAS_IN_CHARGE_PARM_P (fn
))
183 /* When processing templates we can't know, in general, whether or
184 not we're going to have virtual baseclasses. */
185 if (processing_template_decl
)
188 /* We don't need an in-charge parameter for constructors that don't
189 have virtual bases. */
190 if (DECL_CONSTRUCTOR_P (fn
)
191 && !CLASSTYPE_VBASECLASSES (DECL_CONTEXT (fn
)))
194 arg_types
= TYPE_ARG_TYPES (TREE_TYPE (fn
));
195 basetype
= TREE_TYPE (TREE_VALUE (arg_types
));
196 arg_types
= TREE_CHAIN (arg_types
);
198 parms
= TREE_CHAIN (DECL_ARGUMENTS (fn
));
200 /* If this is a subobject constructor or destructor, our caller will
201 pass us a pointer to our VTT. */
202 if (CLASSTYPE_VBASECLASSES (DECL_CONTEXT (fn
)))
204 parm
= build_artificial_parm (vtt_parm_identifier
, vtt_parm_type
);
206 /* First add it to DECL_ARGUMENTS between 'this' and the real args... */
207 TREE_CHAIN (parm
) = parms
;
210 /* ...and then to TYPE_ARG_TYPES. */
211 arg_types
= hash_tree_chain (vtt_parm_type
, arg_types
);
213 DECL_HAS_VTT_PARM_P (fn
) = 1;
216 /* Then add the in-charge parm (before the VTT parm). */
217 parm
= build_artificial_parm (in_charge_identifier
, integer_type_node
);
218 TREE_CHAIN (parm
) = parms
;
220 arg_types
= hash_tree_chain (integer_type_node
, arg_types
);
222 /* Insert our new parameter(s) into the list. */
223 TREE_CHAIN (DECL_ARGUMENTS (fn
)) = parms
;
225 /* And rebuild the function type. */
226 fntype
= build_method_type_directly (basetype
, TREE_TYPE (TREE_TYPE (fn
)),
228 if (TYPE_RAISES_EXCEPTIONS (TREE_TYPE (fn
)))
229 fntype
= build_exception_variant (fntype
,
230 TYPE_RAISES_EXCEPTIONS (TREE_TYPE (fn
)));
231 TREE_TYPE (fn
) = fntype
;
233 /* Now we've got the in-charge parameter. */
234 DECL_HAS_IN_CHARGE_PARM_P (fn
) = 1;
237 /* Classes overload their constituent function names automatically.
238 When a function name is declared in a record structure,
239 its name is changed to it overloaded name. Since names for
240 constructors and destructors can conflict, we place a leading
243 CNAME is the name of the class we are grokking for.
245 FUNCTION is a FUNCTION_DECL. It was created by `grokdeclarator'.
247 FLAGS contains bits saying what's special about today's
248 arguments. 1 == DESTRUCTOR. 2 == OPERATOR.
250 If FUNCTION is a destructor, then we must add the `auto-delete' field
251 as a second parameter. There is some hair associated with the fact
252 that we must "declare" this variable in the manner consistent with the
253 way the rest of the arguments were declared.
255 QUALS are the qualifiers for the this pointer. */
258 grokclassfn (tree ctype
, tree function
, enum overload_flags flags
)
260 tree fn_name
= DECL_NAME (function
);
262 /* Even within an `extern "C"' block, members get C++ linkage. See
263 [dcl.link] for details. */
264 SET_DECL_LANGUAGE (function
, lang_cplusplus
);
266 if (fn_name
== NULL_TREE
)
268 error ("name missing for member function");
269 fn_name
= get_identifier ("<anonymous>");
270 DECL_NAME (function
) = fn_name
;
273 DECL_CONTEXT (function
) = ctype
;
275 if (flags
== DTOR_FLAG
)
276 DECL_DESTRUCTOR_P (function
) = 1;
278 if (flags
== DTOR_FLAG
|| DECL_CONSTRUCTOR_P (function
))
279 maybe_retrofit_in_chrg (function
);
282 /* Create an ARRAY_REF, checking for the user doing things backwards
286 grok_array_decl (tree array_expr
, tree index_exp
)
290 tree orig_array_expr
= array_expr
;
291 tree orig_index_exp
= index_exp
;
293 if (error_operand_p (array_expr
) || error_operand_p (index_exp
))
294 return error_mark_node
;
296 if (processing_template_decl
)
298 if (type_dependent_expression_p (array_expr
)
299 || type_dependent_expression_p (index_exp
))
300 return build_min_nt (ARRAY_REF
, array_expr
, index_exp
,
301 NULL_TREE
, NULL_TREE
);
302 array_expr
= build_non_dependent_expr (array_expr
);
303 index_exp
= build_non_dependent_expr (index_exp
);
306 type
= TREE_TYPE (array_expr
);
308 type
= non_reference (type
);
310 /* If they have an `operator[]', use that. */
311 if (IS_AGGR_TYPE (type
) || IS_AGGR_TYPE (TREE_TYPE (index_exp
)))
312 expr
= build_new_op (ARRAY_REF
, LOOKUP_NORMAL
,
313 array_expr
, index_exp
, NULL_TREE
,
314 /*overloaded_p=*/NULL
);
319 /* Otherwise, create an ARRAY_REF for a pointer or array type.
320 It is a little-known fact that, if `a' is an array and `i' is
321 an int, you can write `i[a]', which means the same thing as
323 if (TREE_CODE (type
) == ARRAY_TYPE
)
326 p1
= build_expr_type_conversion (WANT_POINTER
, array_expr
, false);
328 if (TREE_CODE (TREE_TYPE (index_exp
)) == ARRAY_TYPE
)
331 p2
= build_expr_type_conversion (WANT_POINTER
, index_exp
, false);
333 i1
= build_expr_type_conversion (WANT_INT
| WANT_ENUM
, array_expr
,
335 i2
= build_expr_type_conversion (WANT_INT
| WANT_ENUM
, index_exp
,
338 if ((p1
&& i2
) && (i1
&& p2
))
339 error ("ambiguous conversion for array subscript");
342 array_expr
= p1
, index_exp
= i2
;
344 array_expr
= p2
, index_exp
= i1
;
347 error ("invalid types %<%T[%T]%> for array subscript",
348 type
, TREE_TYPE (index_exp
));
349 return error_mark_node
;
352 if (array_expr
== error_mark_node
|| index_exp
== error_mark_node
)
353 error ("ambiguous conversion for array subscript");
355 expr
= build_array_ref (array_expr
, index_exp
);
357 if (processing_template_decl
&& expr
!= error_mark_node
)
358 return build_min_non_dep (ARRAY_REF
, expr
, orig_array_expr
, orig_index_exp
,
359 NULL_TREE
, NULL_TREE
);
363 /* Given the cast expression EXP, checking out its validity. Either return
364 an error_mark_node if there was an unavoidable error, return a cast to
365 void for trying to delete a pointer w/ the value 0, or return the
366 call to delete. If DOING_VEC is true, we handle things differently
367 for doing an array delete.
368 Implements ARM $5.3.4. This is called from the parser. */
371 delete_sanity (tree exp
, tree size
, bool doing_vec
, int use_global_delete
)
375 if (exp
== error_mark_node
)
378 if (processing_template_decl
)
380 t
= build_min (DELETE_EXPR
, void_type_node
, exp
, size
);
381 DELETE_EXPR_USE_GLOBAL (t
) = use_global_delete
;
382 DELETE_EXPR_USE_VEC (t
) = doing_vec
;
383 TREE_SIDE_EFFECTS (t
) = 1;
387 /* An array can't have been allocated by new, so complain. */
388 if (TREE_CODE (exp
) == VAR_DECL
389 && TREE_CODE (TREE_TYPE (exp
)) == ARRAY_TYPE
)
390 warning (0, "deleting array %q#D", exp
);
392 t
= build_expr_type_conversion (WANT_POINTER
, exp
, true);
394 if (t
== NULL_TREE
|| t
== error_mark_node
)
396 error ("type %q#T argument given to %<delete%>, expected pointer",
398 return error_mark_node
;
401 type
= TREE_TYPE (t
);
403 /* As of Valley Forge, you can delete a pointer to const. */
405 /* You can't delete functions. */
406 if (TREE_CODE (TREE_TYPE (type
)) == FUNCTION_TYPE
)
408 error ("cannot delete a function. Only pointer-to-objects are "
409 "valid arguments to %<delete%>");
410 return error_mark_node
;
413 /* Deleting ptr to void is undefined behavior [expr.delete/3]. */
414 if (TREE_CODE (TREE_TYPE (type
)) == VOID_TYPE
)
416 warning (0, "deleting %qT is undefined", type
);
420 /* Deleting a pointer with the value zero is valid and has no effect. */
421 if (integer_zerop (t
))
422 return build1 (NOP_EXPR
, void_type_node
, t
);
425 return build_vec_delete (t
, /*maxindex=*/NULL_TREE
,
426 sfk_deleting_destructor
,
429 return build_delete (type
, t
, sfk_deleting_destructor
,
430 LOOKUP_NORMAL
, use_global_delete
);
433 /* Report an error if the indicated template declaration is not the
434 sort of thing that should be a member template. */
437 check_member_template (tree tmpl
)
441 gcc_assert (TREE_CODE (tmpl
) == TEMPLATE_DECL
);
442 decl
= DECL_TEMPLATE_RESULT (tmpl
);
444 if (TREE_CODE (decl
) == FUNCTION_DECL
445 || (TREE_CODE (decl
) == TYPE_DECL
446 && IS_AGGR_TYPE (TREE_TYPE (decl
))))
448 if (current_function_decl
)
449 /* 14.5.2.2 [temp.mem]
451 A local class shall not have member templates. */
452 error ("invalid declaration of member template %q#D in local class",
455 /* The parser rejects any use of virtual in a function template. */
456 gcc_assert (!(TREE_CODE (decl
) == FUNCTION_DECL
457 && DECL_VIRTUAL_P (decl
)));
459 /* The debug-information generating code doesn't know what to do
460 with member templates. */
461 DECL_IGNORED_P (tmpl
) = 1;
464 error ("template declaration of %q#D", decl
);
467 /* Return true iff TYPE is a valid Java parameter or return type. */
470 acceptable_java_type (tree type
)
472 if (type
== error_mark_node
)
475 if (TREE_CODE (type
) == VOID_TYPE
|| TYPE_FOR_JAVA (type
))
477 if (TREE_CODE (type
) == POINTER_TYPE
|| TREE_CODE (type
) == REFERENCE_TYPE
)
479 type
= TREE_TYPE (type
);
480 if (TREE_CODE (type
) == RECORD_TYPE
)
483 if (! TYPE_FOR_JAVA (type
))
485 if (! CLASSTYPE_TEMPLATE_INFO (type
))
487 args
= CLASSTYPE_TI_ARGS (type
);
488 i
= TREE_VEC_LENGTH (args
);
491 type
= TREE_VEC_ELT (args
, i
);
492 if (TREE_CODE (type
) == POINTER_TYPE
)
493 type
= TREE_TYPE (type
);
494 if (! TYPE_FOR_JAVA (type
))
503 /* For a METHOD in a Java class CTYPE, return true if
504 the parameter and return types are valid Java types.
505 Otherwise, print appropriate error messages, and return false. */
508 check_java_method (tree method
)
511 tree arg_types
= TYPE_ARG_TYPES (TREE_TYPE (method
));
512 tree ret_type
= TREE_TYPE (TREE_TYPE (method
));
514 if (!acceptable_java_type (ret_type
))
516 error ("Java method %qD has non-Java return type %qT",
521 arg_types
= TREE_CHAIN (arg_types
);
522 if (DECL_HAS_IN_CHARGE_PARM_P (method
))
523 arg_types
= TREE_CHAIN (arg_types
);
524 if (DECL_HAS_VTT_PARM_P (method
))
525 arg_types
= TREE_CHAIN (arg_types
);
527 for (; arg_types
!= NULL_TREE
; arg_types
= TREE_CHAIN (arg_types
))
529 tree type
= TREE_VALUE (arg_types
);
530 if (!acceptable_java_type (type
))
532 if (type
!= error_mark_node
)
533 error ("Java method %qD has non-Java parameter type %qT",
541 /* Sanity check: report error if this function FUNCTION is not
542 really a member of the class (CTYPE) it is supposed to belong to.
543 TEMPLATE_PARMS is used to specify the template parameters of a member
544 template passed as FUNCTION_DECL. If the member template is passed as a
545 TEMPLATE_DECL, it can be NULL since the parameters can be extracted
546 from the declaration. If the function is not a function template, it
548 It returns the original declaration for the function, or NULL_TREE
549 if no declaration was found (and an error was emitted). */
552 check_classfn (tree ctype
, tree function
, tree template_parms
)
557 if (DECL_USE_TEMPLATE (function
)
558 && !(TREE_CODE (function
) == TEMPLATE_DECL
559 && DECL_TEMPLATE_SPECIALIZATION (function
))
560 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (function
)))
561 /* Since this is a specialization of a member template,
562 we're not going to find the declaration in the class.
565 struct S { template <typename T> void f(T); };
566 template <> void S::f(int);
568 we're not going to find `S::f(int)', but there's no
569 reason we should, either. We let our callers know we didn't
570 find the method, but we don't complain. */
573 /* Basic sanity check: for a template function, the template parameters
574 either were not passed, or they are the same of DECL_TEMPLATE_PARMS. */
575 if (TREE_CODE (function
) == TEMPLATE_DECL
)
577 gcc_assert (!template_parms
578 || comp_template_parms (template_parms
,
579 DECL_TEMPLATE_PARMS (function
)));
580 template_parms
= DECL_TEMPLATE_PARMS (function
);
583 /* OK, is this a definition of a member template? */
584 is_template
= (template_parms
!= NULL_TREE
);
586 ix
= class_method_index_for_fn (complete_type (ctype
), function
);
589 VEC(tree
,gc
) *methods
= CLASSTYPE_METHOD_VEC (ctype
);
590 tree fndecls
, fndecl
= 0;
593 const char *format
= NULL
;
595 pushed_scope
= push_scope (ctype
);
596 for (fndecls
= VEC_index (tree
, methods
, ix
);
597 fndecls
; fndecls
= OVL_NEXT (fndecls
))
601 fndecl
= OVL_CURRENT (fndecls
);
602 p1
= TYPE_ARG_TYPES (TREE_TYPE (function
));
603 p2
= TYPE_ARG_TYPES (TREE_TYPE (fndecl
));
605 /* We cannot simply call decls_match because this doesn't
606 work for static member functions that are pretending to
607 be methods, and because the name may have been changed by
610 /* Get rid of the this parameter on functions that become
612 if (DECL_STATIC_FUNCTION_P (fndecl
)
613 && TREE_CODE (TREE_TYPE (function
)) == METHOD_TYPE
)
614 p1
= TREE_CHAIN (p1
);
616 /* A member template definition only matches a member template
618 if (is_template
!= (TREE_CODE (fndecl
) == TEMPLATE_DECL
))
621 if (same_type_p (TREE_TYPE (TREE_TYPE (function
)),
622 TREE_TYPE (TREE_TYPE (fndecl
)))
623 && compparms (p1
, p2
)
625 || comp_template_parms (template_parms
,
626 DECL_TEMPLATE_PARMS (fndecl
)))
627 && (DECL_TEMPLATE_SPECIALIZATION (function
)
628 == DECL_TEMPLATE_SPECIALIZATION (fndecl
))
629 && (!DECL_TEMPLATE_SPECIALIZATION (function
)
630 || (DECL_TI_TEMPLATE (function
)
631 == DECL_TI_TEMPLATE (fndecl
))))
635 pop_scope (pushed_scope
);
637 return OVL_CURRENT (fndecls
);
638 error ("prototype for %q#D does not match any in class %qT",
640 is_conv_op
= DECL_CONV_FN_P (fndecl
);
643 ix
= CLASSTYPE_FIRST_CONVERSION_SLOT
;
644 fndecls
= VEC_index (tree
, methods
, ix
);
647 fndecl
= OVL_CURRENT (fndecls
);
648 fndecls
= OVL_NEXT (fndecls
);
650 if (!fndecls
&& is_conv_op
)
652 if (VEC_length (tree
, methods
) > (size_t) ++ix
)
654 fndecls
= VEC_index (tree
, methods
, ix
);
655 if (!DECL_CONV_FN_P (OVL_CURRENT (fndecls
)))
667 format
= N_("candidates are: %+#D");
669 format
= N_("candidate is: %+#D");
670 error (format
, fndecl
);
673 else if (!COMPLETE_TYPE_P (ctype
))
674 cxx_incomplete_type_error (function
, ctype
);
677 error ("no %q#D member function declared in class %qT",
682 /* If we did not find the method in the class, add it to avoid
683 spurious errors (unless the CTYPE is not yet defined, in which
684 case we'll only confuse ourselves when the function is declared
685 properly within the class. */
686 if (COMPLETE_TYPE_P (ctype
))
687 add_method (ctype
, function
, NULL_TREE
);
691 /* DECL is a function with vague linkage. Remember it so that at the
692 end of the translation unit we can decide whether or not to emit
696 note_vague_linkage_fn (tree decl
)
698 if (!DECL_DEFERRED_FN (decl
))
700 DECL_DEFERRED_FN (decl
) = 1;
701 DECL_DEFER_OUTPUT (decl
) = 1;
702 VEC_safe_push (tree
, gc
, deferred_fns
, decl
);
706 /* We have just processed the DECL, which is a static data member.
707 The other parameters are as for cp_finish_decl. */
710 finish_static_data_member_decl (tree decl
,
711 tree init
, bool init_const_expr_p
,
715 DECL_CONTEXT (decl
) = current_class_type
;
717 /* We cannot call pushdecl here, because that would fill in the
718 TREE_CHAIN of our decl. Instead, we modify cp_finish_decl to do
719 the right thing, namely, to put this decl out straight away. */
721 if (! processing_template_decl
)
722 VEC_safe_push (tree
, gc
, pending_statics
, decl
);
724 if (LOCAL_CLASS_P (current_class_type
))
725 pedwarn ("local class %q#T shall not have static data member %q#D",
726 current_class_type
, decl
);
728 /* Static consts need not be initialized in the class definition. */
729 if (init
!= NULL_TREE
&& TYPE_NEEDS_CONSTRUCTING (TREE_TYPE (decl
)))
731 static int explained
= 0;
733 error ("initializer invalid for static member with constructor");
736 error ("(an out of class initialization is required)");
741 /* Force the compiler to know when an uninitialized static const
742 member is being used. */
743 if (CP_TYPE_CONST_P (TREE_TYPE (decl
)) && init
== 0)
744 TREE_USED (decl
) = 1;
745 DECL_INITIAL (decl
) = init
;
746 DECL_IN_AGGR_P (decl
) = 1;
748 cp_finish_decl (decl
, init
, init_const_expr_p
, asmspec_tree
, flags
);
751 /* DECLARATOR and DECLSPECS correspond to a class member. The other
752 parameters are as for cp_finish_decl. Return the DECL for the
753 class member declared. */
756 grokfield (const cp_declarator
*declarator
,
757 cp_decl_specifier_seq
*declspecs
,
758 tree init
, bool init_const_expr_p
,
763 const char *asmspec
= 0;
764 int flags
= LOOKUP_ONLYCONVERTING
;
766 if (!declspecs
->any_specifiers_p
767 && declarator
->kind
== cdk_id
768 && declarator
->u
.id
.qualifying_scope
769 && TYPE_P (declarator
->u
.id
.qualifying_scope
)
770 && IS_AGGR_TYPE (declarator
->u
.id
.qualifying_scope
)
771 && TREE_CODE (declarator
->u
.id
.unqualified_name
) == IDENTIFIER_NODE
)
772 /* Access declaration */
773 return do_class_using_decl (declarator
->u
.id
.qualifying_scope
,
774 declarator
->u
.id
.unqualified_name
);
777 && TREE_CODE (init
) == TREE_LIST
778 && TREE_VALUE (init
) == error_mark_node
779 && TREE_CHAIN (init
) == NULL_TREE
)
782 value
= grokdeclarator (declarator
, declspecs
, FIELD
, init
!= 0, &attrlist
);
783 if (! value
|| error_operand_p (value
))
784 /* friend or constructor went bad. */
785 return error_mark_node
;
787 if (TREE_CODE (value
) == TYPE_DECL
&& init
)
789 error ("typedef %qD is initialized (use __typeof__ instead)", value
);
793 /* Pass friendly classes back. */
794 if (value
== void_type_node
)
797 /* Pass friend decls back. */
798 if ((TREE_CODE (value
) == FUNCTION_DECL
799 || TREE_CODE (value
) == TEMPLATE_DECL
)
800 && DECL_CONTEXT (value
) != current_class_type
)
803 if (DECL_NAME (value
) != NULL_TREE
804 && IDENTIFIER_POINTER (DECL_NAME (value
))[0] == '_'
805 && ! strcmp (IDENTIFIER_POINTER (DECL_NAME (value
)), "_vptr"))
806 error ("member %qD conflicts with virtual function table field name",
809 /* Stash away type declarations. */
810 if (TREE_CODE (value
) == TYPE_DECL
)
812 DECL_NONLOCAL (value
) = 1;
813 DECL_CONTEXT (value
) = current_class_type
;
815 if (processing_template_decl
)
816 value
= push_template_decl (value
);
820 /* Avoid storing attributes in template parameters:
821 tsubst is not ready to handle them. */
822 tree type
= TREE_TYPE (value
);
823 if (TREE_CODE (type
) == TEMPLATE_TYPE_PARM
824 || TREE_CODE (type
) == BOUND_TEMPLATE_TEMPLATE_PARM
)
825 sorry ("applying attributes to template parameters is not implemented");
827 cplus_decl_attributes (&value
, attrlist
, 0);
833 if (DECL_IN_AGGR_P (value
))
835 error ("%qD is already defined in %qT", value
, DECL_CONTEXT (value
));
836 return void_type_node
;
839 if (asmspec_tree
&& asmspec_tree
!= error_mark_node
)
840 asmspec
= TREE_STRING_POINTER (asmspec_tree
);
844 if (TREE_CODE (value
) == FUNCTION_DECL
)
846 /* Initializers for functions are rejected early in the parser.
847 If we get here, it must be a pure specifier for a method. */
848 if (TREE_CODE (TREE_TYPE (value
)) == METHOD_TYPE
)
850 gcc_assert (error_operand_p (init
) || integer_zerop (init
));
851 DECL_PURE_VIRTUAL_P (value
) = 1;
855 gcc_assert (TREE_CODE (TREE_TYPE (value
)) == FUNCTION_TYPE
);
856 error ("initializer specified for static member function %qD",
860 else if (pedantic
&& TREE_CODE (value
) != VAR_DECL
)
861 /* Already complained in grokdeclarator. */
863 else if (!processing_template_decl
)
865 if (TREE_CODE (init
) == CONSTRUCTOR
)
866 init
= digest_init (TREE_TYPE (value
), init
);
868 init
= integral_constant_value (init
);
870 if (init
!= error_mark_node
&& !TREE_CONSTANT (init
))
872 /* We can allow references to things that are effectively
873 static, since references are initialized with the
875 if (TREE_CODE (TREE_TYPE (value
)) != REFERENCE_TYPE
876 || (TREE_STATIC (init
) == 0
877 && (!DECL_P (init
) || DECL_EXTERNAL (init
) == 0)))
879 error ("field initializer is not constant");
880 init
= error_mark_node
;
886 if (processing_template_decl
887 && (TREE_CODE (value
) == VAR_DECL
|| TREE_CODE (value
) == FUNCTION_DECL
))
889 value
= push_template_decl (value
);
890 if (error_operand_p (value
))
891 return error_mark_node
;
895 cplus_decl_attributes (&value
, attrlist
, 0);
897 switch (TREE_CODE (value
))
900 finish_static_data_member_decl (value
, init
, init_const_expr_p
,
901 asmspec_tree
, flags
);
906 error ("%<asm%> specifiers are not permitted on non-static data members");
907 if (DECL_INITIAL (value
) == error_mark_node
)
908 init
= error_mark_node
;
909 cp_finish_decl (value
, init
, /*init_const_expr_p=*/false,
911 DECL_INITIAL (value
) = init
;
912 DECL_IN_AGGR_P (value
) = 1;
917 set_user_assembler_name (value
, asmspec
);
919 cp_finish_decl (value
,
921 /*init_const_expr_p=*/false,
922 asmspec_tree
, flags
);
924 /* Pass friends back this way. */
925 if (DECL_FRIEND_P (value
))
926 return void_type_node
;
928 DECL_IN_AGGR_P (value
) = 1;
937 /* Like `grokfield', but for bitfields.
938 WIDTH is non-NULL for bit fields only, and is an INTEGER_CST node. */
941 grokbitfield (const cp_declarator
*declarator
,
942 cp_decl_specifier_seq
*declspecs
, tree width
)
944 tree value
= grokdeclarator (declarator
, declspecs
, BITFIELD
, 0, NULL
);
946 if (value
== error_mark_node
)
947 return NULL_TREE
; /* friends went bad. */
949 /* Pass friendly classes back. */
950 if (TREE_CODE (value
) == VOID_TYPE
)
951 return void_type_node
;
953 if (TREE_CODE (value
) == TYPE_DECL
)
955 error ("cannot declare %qD to be a bit-field type", value
);
959 /* Usually, finish_struct_1 catches bitfields with invalid types.
960 But, in the case of bitfields with function type, we confuse
961 ourselves into thinking they are member functions, so we must
963 if (TREE_CODE (value
) == FUNCTION_DECL
)
965 error ("cannot declare bit-field %qD with function type",
970 if (DECL_IN_AGGR_P (value
))
972 error ("%qD is already defined in the class %qT", value
,
973 DECL_CONTEXT (value
));
974 return void_type_node
;
977 if (TREE_STATIC (value
))
979 error ("static member %qD cannot be a bit-field", value
);
982 finish_decl (value
, NULL_TREE
, NULL_TREE
);
984 if (width
!= error_mark_node
)
986 constant_expression_warning (width
);
987 DECL_INITIAL (value
) = width
;
988 SET_DECL_C_BIT_FIELD (value
);
991 DECL_IN_AGGR_P (value
) = 1;
997 cplus_decl_attributes (tree
*decl
, tree attributes
, int flags
)
999 if (*decl
== NULL_TREE
|| *decl
== void_type_node
1000 || *decl
== error_mark_node
)
1003 if (TREE_CODE (*decl
) == TEMPLATE_DECL
)
1004 decl
= &DECL_TEMPLATE_RESULT (*decl
);
1006 decl_attributes (decl
, attributes
, flags
);
1008 if (TREE_CODE (*decl
) == TYPE_DECL
)
1009 SET_IDENTIFIER_TYPE_VALUE (DECL_NAME (*decl
), TREE_TYPE (*decl
));
1012 /* Walks through the namespace- or function-scope anonymous union
1013 OBJECT, with the indicated TYPE, building appropriate VAR_DECLs.
1014 Returns one of the fields for use in the mangled name. */
1017 build_anon_union_vars (tree type
, tree object
)
1019 tree main_decl
= NULL_TREE
;
1022 /* Rather than write the code to handle the non-union case,
1023 just give an error. */
1024 if (TREE_CODE (type
) != UNION_TYPE
)
1025 error ("anonymous struct not inside named type");
1027 for (field
= TYPE_FIELDS (type
);
1029 field
= TREE_CHAIN (field
))
1034 if (DECL_ARTIFICIAL (field
))
1036 if (TREE_CODE (field
) != FIELD_DECL
)
1038 pedwarn ("%q+#D invalid; an anonymous union can only "
1039 "have non-static data members", field
);
1043 if (TREE_PRIVATE (field
))
1044 pedwarn ("private member %q+#D in anonymous union", field
);
1045 else if (TREE_PROTECTED (field
))
1046 pedwarn ("protected member %q+#D in anonymous union", field
);
1048 if (processing_template_decl
)
1049 ref
= build_min_nt (COMPONENT_REF
, object
,
1050 DECL_NAME (field
), NULL_TREE
);
1052 ref
= build_class_member_access_expr (object
, field
, NULL_TREE
,
1055 if (DECL_NAME (field
))
1059 decl
= build_decl (VAR_DECL
, DECL_NAME (field
), TREE_TYPE (field
));
1061 base
= get_base_address (object
);
1062 TREE_PUBLIC (decl
) = TREE_PUBLIC (base
);
1063 TREE_STATIC (decl
) = TREE_STATIC (base
);
1064 DECL_EXTERNAL (decl
) = DECL_EXTERNAL (base
);
1066 SET_DECL_VALUE_EXPR (decl
, ref
);
1067 DECL_HAS_VALUE_EXPR_P (decl
) = 1;
1069 decl
= pushdecl (decl
);
1071 else if (ANON_AGGR_TYPE_P (TREE_TYPE (field
)))
1072 decl
= build_anon_union_vars (TREE_TYPE (field
), ref
);
1076 if (main_decl
== NULL_TREE
)
1083 /* Finish off the processing of a UNION_TYPE structure. If the union is an
1084 anonymous union, then all members must be laid out together. PUBLIC_P
1085 is nonzero if this union is not declared static. */
1088 finish_anon_union (tree anon_union_decl
)
1094 if (anon_union_decl
== error_mark_node
)
1097 type
= TREE_TYPE (anon_union_decl
);
1098 public_p
= TREE_PUBLIC (anon_union_decl
);
1100 /* The VAR_DECL's context is the same as the TYPE's context. */
1101 DECL_CONTEXT (anon_union_decl
) = DECL_CONTEXT (TYPE_NAME (type
));
1103 if (TYPE_FIELDS (type
) == NULL_TREE
)
1108 error ("namespace-scope anonymous aggregates must be static");
1112 main_decl
= build_anon_union_vars (type
, anon_union_decl
);
1113 if (main_decl
== error_mark_node
)
1115 if (main_decl
== NULL_TREE
)
1117 warning (0, "anonymous union with no members");
1121 if (!processing_template_decl
)
1123 /* Use main_decl to set the mangled name. */
1124 DECL_NAME (anon_union_decl
) = DECL_NAME (main_decl
);
1125 mangle_decl (anon_union_decl
);
1126 DECL_NAME (anon_union_decl
) = NULL_TREE
;
1129 pushdecl (anon_union_decl
);
1130 if (building_stmt_tree ()
1131 && at_function_scope_p ())
1132 add_decl_expr (anon_union_decl
);
1133 else if (!processing_template_decl
)
1134 rest_of_decl_compilation (anon_union_decl
,
1135 toplevel_bindings_p (), at_eof
);
1138 /* Auxiliary functions to make type signatures for
1139 `operator new' and `operator delete' correspond to
1140 what compiler will be expecting. */
1143 coerce_new_type (tree type
)
1146 tree args
= TYPE_ARG_TYPES (type
);
1148 gcc_assert (TREE_CODE (type
) == FUNCTION_TYPE
);
1150 if (!same_type_p (TREE_TYPE (type
), ptr_type_node
))
1153 error ("%<operator new%> must return type %qT", ptr_type_node
);
1156 if (!args
|| args
== void_list_node
1157 || !same_type_p (TREE_VALUE (args
), size_type_node
))
1160 if (args
&& args
!= void_list_node
)
1161 args
= TREE_CHAIN (args
);
1162 pedwarn ("%<operator new%> takes type %<size_t%> (%qT) "
1163 "as first parameter", size_type_node
);
1168 args
= tree_cons (NULL_TREE
, size_type_node
, args
);
1171 type
= build_exception_variant
1172 (build_function_type (ptr_type_node
, args
),
1173 TYPE_RAISES_EXCEPTIONS (type
));
1181 coerce_delete_type (tree type
)
1184 tree args
= TYPE_ARG_TYPES (type
);
1186 gcc_assert (TREE_CODE (type
) == FUNCTION_TYPE
);
1188 if (!same_type_p (TREE_TYPE (type
), void_type_node
))
1191 error ("%<operator delete%> must return type %qT", void_type_node
);
1194 if (!args
|| args
== void_list_node
1195 || !same_type_p (TREE_VALUE (args
), ptr_type_node
))
1198 if (args
&& args
!= void_list_node
)
1199 args
= TREE_CHAIN (args
);
1200 error ("%<operator delete%> takes type %qT as first parameter",
1206 args
= tree_cons (NULL_TREE
, ptr_type_node
, args
);
1209 type
= build_exception_variant
1210 (build_function_type (void_type_node
, args
),
1211 TYPE_RAISES_EXCEPTIONS (type
));
1220 mark_vtable_entries (tree decl
)
1223 unsigned HOST_WIDE_INT idx
;
1225 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (DECL_INITIAL (decl
)),
1230 STRIP_NOPS (fnaddr
);
1232 if (TREE_CODE (fnaddr
) != ADDR_EXPR
1233 && TREE_CODE (fnaddr
) != FDESC_EXPR
)
1234 /* This entry is an offset: a virtual base class offset, a
1235 virtual call offset, an RTTI offset, etc. */
1238 fn
= TREE_OPERAND (fnaddr
, 0);
1239 TREE_ADDRESSABLE (fn
) = 1;
1240 /* When we don't have vcall offsets, we output thunks whenever
1241 we output the vtables that contain them. With vcall offsets,
1242 we know all the thunks we'll need when we emit a virtual
1243 function, so we emit the thunks there instead. */
1244 if (DECL_THUNK_P (fn
))
1245 use_thunk (fn
, /*emit_p=*/0);
1250 /* Set DECL up to have the closest approximation of "initialized common"
1251 linkage available. */
1254 comdat_linkage (tree decl
)
1257 make_decl_one_only (decl
);
1258 else if (TREE_CODE (decl
) == FUNCTION_DECL
1259 || (TREE_CODE (decl
) == VAR_DECL
&& DECL_ARTIFICIAL (decl
)))
1260 /* We can just emit function and compiler-generated variables
1261 statically; having multiple copies is (for the most part) only
1264 There are two correctness issues, however: the address of a
1265 template instantiation with external linkage should be the
1266 same, independent of what translation unit asks for the
1267 address, and this will not hold when we emit multiple copies of
1268 the function. However, there's little else we can do.
1270 Also, by default, the typeinfo implementation assumes that
1271 there will be only one copy of the string used as the name for
1272 each type. Therefore, if weak symbols are unavailable, the
1273 run-time library should perform a more conservative check; it
1274 should perform a string comparison, rather than an address
1276 TREE_PUBLIC (decl
) = 0;
1279 /* Static data member template instantiations, however, cannot
1280 have multiple copies. */
1281 if (DECL_INITIAL (decl
) == 0
1282 || DECL_INITIAL (decl
) == error_mark_node
)
1283 DECL_COMMON (decl
) = 1;
1284 else if (EMPTY_CONSTRUCTOR_P (DECL_INITIAL (decl
)))
1286 DECL_COMMON (decl
) = 1;
1287 DECL_INITIAL (decl
) = error_mark_node
;
1289 else if (!DECL_EXPLICIT_INSTANTIATION (decl
))
1291 /* We can't do anything useful; leave vars for explicit
1293 DECL_EXTERNAL (decl
) = 1;
1294 DECL_NOT_REALLY_EXTERN (decl
) = 0;
1298 if (DECL_LANG_SPECIFIC (decl
))
1299 DECL_COMDAT (decl
) = 1;
1302 /* For win32 we also want to put explicit instantiations in
1303 linkonce sections, so that they will be merged with implicit
1304 instantiations; otherwise we get duplicate symbol errors.
1305 For Darwin we do not want explicit instantiations to be
1309 maybe_make_one_only (tree decl
)
1311 /* We used to say that this was not necessary on targets that support weak
1312 symbols, because the implicit instantiations will defer to the explicit
1313 one. However, that's not actually the case in SVR4; a strong definition
1314 after a weak one is an error. Also, not making explicit
1315 instantiations one_only means that we can end up with two copies of
1316 some template instantiations. */
1320 /* We can't set DECL_COMDAT on functions, or cp_finish_file will think
1321 we can get away with not emitting them if they aren't used. We need
1322 to for variables so that cp_finish_decl will update their linkage,
1323 because their DECL_INITIAL may not have been set properly yet. */
1325 if (!TARGET_WEAK_NOT_IN_ARCHIVE_TOC
1326 || (! DECL_EXPLICIT_INSTANTIATION (decl
)
1327 && ! DECL_TEMPLATE_SPECIALIZATION (decl
)))
1329 make_decl_one_only (decl
);
1331 if (TREE_CODE (decl
) == VAR_DECL
)
1333 DECL_COMDAT (decl
) = 1;
1334 /* Mark it needed so we don't forget to emit it. */
1335 mark_decl_referenced (decl
);
1340 /* Determine whether or not we want to specifically import or export CTYPE,
1341 using various heuristics. */
1344 import_export_class (tree ctype
)
1346 /* -1 for imported, 1 for exported. */
1347 int import_export
= 0;
1349 /* It only makes sense to call this function at EOF. The reason is
1350 that this function looks at whether or not the first non-inline
1351 non-abstract virtual member function has been defined in this
1352 translation unit. But, we can't possibly know that until we've
1353 seen the entire translation unit. */
1354 gcc_assert (at_eof
);
1356 if (CLASSTYPE_INTERFACE_KNOWN (ctype
))
1359 /* If MULTIPLE_SYMBOL_SPACES is set and we saw a #pragma interface,
1360 we will have CLASSTYPE_INTERFACE_ONLY set but not
1361 CLASSTYPE_INTERFACE_KNOWN. In that case, we don't want to use this
1362 heuristic because someone will supply a #pragma implementation
1363 elsewhere, and deducing it here would produce a conflict. */
1364 if (CLASSTYPE_INTERFACE_ONLY (ctype
))
1367 if (lookup_attribute ("dllimport", TYPE_ATTRIBUTES (ctype
)))
1369 else if (lookup_attribute ("dllexport", TYPE_ATTRIBUTES (ctype
)))
1371 else if (CLASSTYPE_IMPLICIT_INSTANTIATION (ctype
)
1372 && !flag_implicit_templates
)
1373 /* For a template class, without -fimplicit-templates, check the
1374 repository. If the virtual table is assigned to this
1375 translation unit, then export the class; otherwise, import
1377 import_export
= repo_export_class_p (ctype
) ? 1 : -1;
1378 else if (TYPE_POLYMORPHIC_P (ctype
))
1380 /* The ABI specifies that the virtual table and associated
1381 information are emitted with the key method, if any. */
1382 tree method
= CLASSTYPE_KEY_METHOD (ctype
);
1383 /* If weak symbol support is not available, then we must be
1384 careful not to emit the vtable when the key function is
1385 inline. An inline function can be defined in multiple
1386 translation units. If we were to emit the vtable in each
1387 translation unit containing a definition, we would get
1388 multiple definition errors at link-time. */
1389 if (method
&& (flag_weak
|| ! DECL_DECLARED_INLINE_P (method
)))
1390 import_export
= (DECL_REALLY_EXTERN (method
) ? -1 : 1);
1393 /* When MULTIPLE_SYMBOL_SPACES is set, we cannot count on seeing
1394 a definition anywhere else. */
1395 if (MULTIPLE_SYMBOL_SPACES
&& import_export
== -1)
1398 /* Allow backends the chance to overrule the decision. */
1399 if (targetm
.cxx
.import_export_class
)
1400 import_export
= targetm
.cxx
.import_export_class (ctype
, import_export
);
1404 SET_CLASSTYPE_INTERFACE_KNOWN (ctype
);
1405 CLASSTYPE_INTERFACE_ONLY (ctype
) = (import_export
< 0);
1409 /* Return true if VAR has already been provided to the back end; in that
1410 case VAR should not be modified further by the front end. */
1412 var_finalized_p (tree var
)
1414 return cgraph_varpool_node (var
)->finalized
;
1417 /* DECL is a VAR_DECL or FUNCTION_DECL which, for whatever reason,
1418 must be emitted in this translation unit. Mark it as such. */
1421 mark_needed (tree decl
)
1423 /* It's possible that we no longer need to set
1424 TREE_SYMBOL_REFERENCED here directly, but doing so is
1426 TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
)) = 1;
1427 mark_decl_referenced (decl
);
1430 /* DECL is either a FUNCTION_DECL or a VAR_DECL. This function
1431 returns true if a definition of this entity should be provided in
1432 this object file. Callers use this function to determine whether
1433 or not to let the back end know that a definition of DECL is
1434 available in this translation unit. */
1437 decl_needed_p (tree decl
)
1439 gcc_assert (TREE_CODE (decl
) == VAR_DECL
1440 || TREE_CODE (decl
) == FUNCTION_DECL
);
1441 /* This function should only be called at the end of the translation
1442 unit. We cannot be sure of whether or not something will be
1443 COMDAT until that point. */
1444 gcc_assert (at_eof
);
1446 /* All entities with external linkage that are not COMDAT should be
1447 emitted; they may be referred to from other object files. */
1448 if (TREE_PUBLIC (decl
) && !DECL_COMDAT (decl
))
1450 /* If this entity was used, let the back-end see it; it will decide
1451 whether or not to emit it into the object file. */
1452 if (TREE_USED (decl
)
1453 || (DECL_ASSEMBLER_NAME_SET_P (decl
)
1454 && TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
))))
1456 /* Otherwise, DECL does not need to be emitted -- yet. A subsequent
1457 reference to DECL might cause it to be emitted later. */
1461 /* If necessary, write out the vtables for the dynamic class CTYPE.
1462 Returns true if any vtables were emitted. */
1465 maybe_emit_vtables (tree ctype
)
1471 /* If the vtables for this class have already been emitted there is
1472 nothing more to do. */
1473 primary_vtbl
= CLASSTYPE_VTABLES (ctype
);
1474 if (var_finalized_p (primary_vtbl
))
1476 /* Ignore dummy vtables made by get_vtable_decl. */
1477 if (TREE_TYPE (primary_vtbl
) == void_type_node
)
1480 /* On some targets, we cannot determine the key method until the end
1481 of the translation unit -- which is when this function is
1483 if (!targetm
.cxx
.key_method_may_be_inline ())
1484 determine_key_method (ctype
);
1486 /* See if any of the vtables are needed. */
1487 for (vtbl
= CLASSTYPE_VTABLES (ctype
); vtbl
; vtbl
= TREE_CHAIN (vtbl
))
1489 import_export_decl (vtbl
);
1490 if (DECL_NOT_REALLY_EXTERN (vtbl
) && decl_needed_p (vtbl
))
1495 /* If the references to this class' vtables are optimized away,
1496 still emit the appropriate debugging information. See
1498 if (DECL_COMDAT (primary_vtbl
)
1499 && CLASSTYPE_DEBUG_REQUESTED (ctype
))
1500 note_debug_info_needed (ctype
);
1504 /* The ABI requires that we emit all of the vtables if we emit any
1506 for (vtbl
= CLASSTYPE_VTABLES (ctype
); vtbl
; vtbl
= TREE_CHAIN (vtbl
))
1508 /* Mark entities references from the virtual table as used. */
1509 mark_vtable_entries (vtbl
);
1511 if (TREE_TYPE (DECL_INITIAL (vtbl
)) == 0)
1513 tree expr
= store_init_value (vtbl
, DECL_INITIAL (vtbl
));
1515 /* It had better be all done at compile-time. */
1520 DECL_EXTERNAL (vtbl
) = 0;
1521 rest_of_decl_compilation (vtbl
, 1, 1);
1523 /* Because we're only doing syntax-checking, we'll never end up
1524 actually marking the variable as written. */
1525 if (flag_syntax_only
)
1526 TREE_ASM_WRITTEN (vtbl
) = 1;
1529 /* Since we're writing out the vtable here, also write the debug
1531 note_debug_info_needed (ctype
);
1536 /* A special return value from type_visibility meaning internal
1539 enum { VISIBILITY_ANON
= VISIBILITY_INTERNAL
+1 };
1541 /* walk_tree helper function for type_visibility. */
1544 min_vis_r (tree
*tp
, int *walk_subtrees
, void *data
)
1546 int *vis_p
= (int *)data
;
1551 else if (CLASS_TYPE_P (*tp
))
1553 if (!TREE_PUBLIC (TYPE_MAIN_DECL (*tp
)))
1555 *vis_p
= VISIBILITY_ANON
;
1558 else if (CLASSTYPE_VISIBILITY (*tp
) > *vis_p
)
1559 *vis_p
= CLASSTYPE_VISIBILITY (*tp
);
1564 /* Returns the visibility of TYPE, which is the minimum visibility of its
1568 type_visibility (tree type
)
1570 int vis
= VISIBILITY_DEFAULT
;
1571 walk_tree_without_duplicates (&type
, min_vis_r
, &vis
);
1575 /* Limit the visibility of DECL to VISIBILITY, if not explicitly
1576 specified (or if VISIBILITY is static). */
1579 constrain_visibility (tree decl
, int visibility
)
1581 if (visibility
== VISIBILITY_ANON
)
1583 /* extern "C" declarations aren't affected by the anonymous
1585 if (!DECL_EXTERN_C_P (decl
))
1587 TREE_PUBLIC (decl
) = 0;
1588 DECL_INTERFACE_KNOWN (decl
) = 1;
1589 if (DECL_LANG_SPECIFIC (decl
))
1590 DECL_NOT_REALLY_EXTERN (decl
) = 1;
1593 else if (visibility
> DECL_VISIBILITY (decl
)
1594 && !DECL_VISIBILITY_SPECIFIED (decl
))
1596 DECL_VISIBILITY (decl
) = visibility
;
1602 /* Constrain the visibility of DECL based on the visibility of its template
1606 constrain_visibility_for_template (tree decl
, tree targs
)
1608 /* If this is a template instantiation, check the innermost
1609 template args for visibility constraints. The outer template
1610 args are covered by the class check. */
1611 tree args
= INNERMOST_TEMPLATE_ARGS (targs
);
1613 for (i
= TREE_VEC_LENGTH (args
); i
> 0; --i
)
1617 tree arg
= TREE_VEC_ELT (args
, i
-1);
1619 vis
= type_visibility (arg
);
1620 else if (TREE_TYPE (arg
) && POINTER_TYPE_P (TREE_TYPE (arg
)))
1623 if (TREE_CODE (arg
) == ADDR_EXPR
)
1624 arg
= TREE_OPERAND (arg
, 0);
1625 if (TREE_CODE (arg
) == VAR_DECL
1626 || TREE_CODE (arg
) == FUNCTION_DECL
)
1628 if (! TREE_PUBLIC (arg
))
1629 vis
= VISIBILITY_ANON
;
1631 vis
= DECL_VISIBILITY (arg
);
1635 constrain_visibility (decl
, vis
);
1639 /* Like c_determine_visibility, but with additional C++-specific
1642 Function-scope entities can rely on the function's visibility because
1643 it is set in start_preparsed_function.
1645 Class-scope entities cannot rely on the class's visibility until the end
1646 of the enclosing class definition.
1648 Note that because namespaces have multiple independent definitions,
1649 namespace visibility is handled elsewhere using the #pragma visibility
1650 machinery rather than by decorating the namespace declaration.
1652 The goal is for constraints from the type to give a diagnostic, and
1653 other constraints to be applied silently. */
1656 determine_visibility (tree decl
)
1658 tree class_type
= NULL_TREE
;
1661 /* Remember that all decls get VISIBILITY_DEFAULT when built. */
1663 /* Only relevant for names with external linkage. */
1664 if (!TREE_PUBLIC (decl
))
1667 /* Cloned constructors and destructors get the same visibility as
1668 the underlying function. That should be set up in
1669 maybe_clone_body. */
1670 gcc_assert (!DECL_CLONED_FUNCTION_P (decl
));
1672 if (TREE_CODE (decl
) == TYPE_DECL
)
1674 if (CLASS_TYPE_P (TREE_TYPE (decl
)))
1675 use_template
= CLASSTYPE_USE_TEMPLATE (TREE_TYPE (decl
));
1676 else if (TYPE_TEMPLATE_INFO (TREE_TYPE (decl
)))
1681 else if (DECL_LANG_SPECIFIC (decl
))
1682 use_template
= DECL_USE_TEMPLATE (decl
);
1686 /* Anything that is exported must have default visibility. */
1687 if (TARGET_DLLIMPORT_DECL_ATTRIBUTES
1688 && lookup_attribute ("dllexport",
1689 TREE_CODE (decl
) == TYPE_DECL
1690 ? TYPE_ATTRIBUTES (TREE_TYPE (decl
))
1691 : DECL_ATTRIBUTES (decl
)))
1693 DECL_VISIBILITY (decl
) = VISIBILITY_DEFAULT
;
1694 DECL_VISIBILITY_SPECIFIED (decl
) = 1;
1697 /* If DECL is a member of a class, visibility specifiers on the
1698 class can influence the visibility of the DECL. */
1699 if (DECL_CLASS_SCOPE_P (decl
))
1700 class_type
= DECL_CONTEXT (decl
);
1701 else if (TREE_CODE (decl
) == VAR_DECL
1702 && DECL_TINFO_P (decl
)
1703 && CLASS_TYPE_P (TREE_TYPE (DECL_NAME (decl
))))
1704 class_type
= TREE_TYPE (DECL_NAME (decl
));
1707 /* Not a class member. */
1709 /* Virtual tables have DECL_CONTEXT set to their associated class,
1710 so they are automatically handled above. */
1711 gcc_assert (TREE_CODE (decl
) != VAR_DECL
1712 || !DECL_VTABLE_OR_VTT_P (decl
));
1714 if (DECL_FUNCTION_SCOPE_P (decl
) && ! DECL_VISIBILITY_SPECIFIED (decl
))
1716 /* Local statics and classes get the visibility of their
1717 containing function by default, except that
1718 -fvisibility-inlines-hidden doesn't affect them. */
1719 tree fn
= DECL_CONTEXT (decl
);
1720 if (DECL_VISIBILITY_SPECIFIED (fn
) || ! DECL_CLASS_SCOPE_P (fn
))
1722 DECL_VISIBILITY (decl
) = DECL_VISIBILITY (fn
);
1723 DECL_VISIBILITY_SPECIFIED (decl
) =
1724 DECL_VISIBILITY_SPECIFIED (fn
);
1727 determine_visibility_from_class (decl
, DECL_CONTEXT (fn
));
1729 /* Local classes in templates have CLASSTYPE_USE_TEMPLATE set,
1730 but have no TEMPLATE_INFO, so don't try to check it. */
1733 else if (TREE_CODE (decl
) == VAR_DECL
&& DECL_TINFO_P (decl
))
1735 /* tinfo visibility is based on the type it's for. */
1736 constrain_visibility
1737 (decl
, type_visibility (TREE_TYPE (DECL_NAME (decl
))));
1739 else if (use_template
)
1740 /* Template instantiations and specializations get visibility based
1741 on their template unless they override it with an attribute. */;
1742 else if (! DECL_VISIBILITY_SPECIFIED (decl
))
1744 /* Set default visibility to whatever the user supplied with
1745 #pragma GCC visibility or a namespace visibility attribute. */
1746 DECL_VISIBILITY (decl
) = default_visibility
;
1747 DECL_VISIBILITY_SPECIFIED (decl
) = visibility_options
.inpragma
;
1753 /* If the specialization doesn't specify visibility, use the
1754 visibility from the template. */
1755 tree tinfo
= (TREE_CODE (decl
) == TYPE_DECL
1756 ? TYPE_TEMPLATE_INFO (TREE_TYPE (decl
))
1757 : DECL_TEMPLATE_INFO (decl
));
1758 tree args
= TI_ARGS (tinfo
);
1759 int depth
= TMPL_ARGS_DEPTH (args
);
1760 tree pattern
= DECL_TEMPLATE_RESULT (TI_TEMPLATE (tinfo
));
1762 if (!DECL_VISIBILITY_SPECIFIED (decl
))
1764 DECL_VISIBILITY (decl
) = DECL_VISIBILITY (pattern
);
1765 DECL_VISIBILITY_SPECIFIED (decl
)
1766 = DECL_VISIBILITY_SPECIFIED (pattern
);
1769 /* FIXME should TMPL_ARGS_DEPTH really return 1 for null input? */
1770 if (args
&& depth
> template_class_depth (class_type
))
1771 /* Limit visibility based on its template arguments. */
1772 constrain_visibility_for_template (decl
, args
);
1776 determine_visibility_from_class (decl
, class_type
);
1778 /* Don't let it have more visibility than its type. */
1779 if (TREE_CODE (decl
) != TYPE_DECL
)
1780 if (constrain_visibility (decl
, type_visibility (TREE_TYPE (decl
))))
1781 warning (OPT_Wattributes
, "\
1782 lowering visibility of %q+D to match its type",
1785 if (decl_anon_ns_mem_p (decl
))
1786 /* Names in an anonymous namespace get internal linkage.
1787 This might change once we implement export. */
1788 constrain_visibility (decl
, VISIBILITY_ANON
);
1791 /* By default, static data members and function members receive
1792 the visibility of their containing class. */
1795 determine_visibility_from_class (tree decl
, tree class_type
)
1797 if (visibility_options
.inlines_hidden
1798 /* Don't do this for inline templates; specializations might not be
1799 inline, and we don't want them to inherit the hidden
1800 visibility. We'll set it here for all inline instantiations. */
1801 && !processing_template_decl
1802 && ! DECL_VISIBILITY_SPECIFIED (decl
)
1803 && TREE_CODE (decl
) == FUNCTION_DECL
1804 && DECL_DECLARED_INLINE_P (decl
))
1805 DECL_VISIBILITY (decl
) = VISIBILITY_HIDDEN
;
1806 else if (!DECL_VISIBILITY_SPECIFIED (decl
))
1808 /* Default to the class visibility. */
1809 DECL_VISIBILITY (decl
) = CLASSTYPE_VISIBILITY (class_type
);
1810 DECL_VISIBILITY_SPECIFIED (decl
)
1811 = CLASSTYPE_VISIBILITY_SPECIFIED (class_type
);
1814 /* Give the target a chance to override the visibility associated
1816 if (TREE_CODE (decl
) == VAR_DECL
1817 && (DECL_TINFO_P (decl
)
1818 || (DECL_VTABLE_OR_VTT_P (decl
)
1819 /* Construction virtual tables are not exported because
1820 they cannot be referred to from other object files;
1821 their name is not standardized by the ABI. */
1822 && !DECL_CONSTRUCTION_VTABLE_P (decl
)))
1823 && TREE_PUBLIC (decl
)
1824 && !DECL_REALLY_EXTERN (decl
)
1825 && !DECL_VISIBILITY_SPECIFIED (decl
)
1826 && !CLASSTYPE_VISIBILITY_SPECIFIED (class_type
))
1827 targetm
.cxx
.determine_class_data_visibility (decl
);
1830 /* Constrain the visibility of a class TYPE based on the visibility of its
1831 field types. Warn if any fields require lesser visibility. */
1834 constrain_class_visibility (tree type
)
1840 int vis
= type_visibility (type
);
1842 if (vis
== VISIBILITY_ANON
)
1845 /* Don't warn about visibility if the class has explicit visibility. */
1846 if (CLASSTYPE_VISIBILITY_SPECIFIED (type
))
1847 vis
= VISIBILITY_INTERNAL
;
1849 for (t
= TYPE_FIELDS (type
); t
; t
= TREE_CHAIN (t
))
1850 if (TREE_CODE (t
) == FIELD_DECL
&& TREE_TYPE (t
) != error_mark_node
)
1852 int subvis
= type_visibility (TREE_TYPE (t
));
1854 if (subvis
== VISIBILITY_ANON
)
1856 %qT has a field %qD whose type uses the anonymous namespace",
1858 else if (vis
< VISIBILITY_HIDDEN
1859 && subvis
>= VISIBILITY_HIDDEN
)
1860 warning (OPT_Wattributes
, "\
1861 %qT declared with greater visibility than the type of its field %qD",
1865 binfo
= TYPE_BINFO (type
);
1866 for (i
= 0; BINFO_BASE_ITERATE (binfo
, i
, t
); ++i
)
1868 int subvis
= type_visibility (TREE_TYPE (t
));
1870 if (subvis
== VISIBILITY_ANON
)
1872 %qT has a base %qT whose type uses the anonymous namespace",
1873 type
, TREE_TYPE (t
));
1874 else if (vis
< VISIBILITY_HIDDEN
1875 && subvis
>= VISIBILITY_HIDDEN
)
1876 warning (OPT_Wattributes
, "\
1877 %qT declared with greater visibility than its base %qT",
1878 type
, TREE_TYPE (t
));
1882 /* DECL is a FUNCTION_DECL or VAR_DECL. If the object file linkage
1883 for DECL has not already been determined, do so now by setting
1884 DECL_EXTERNAL, DECL_COMDAT and other related flags. Until this
1885 function is called entities with vague linkage whose definitions
1886 are available must have TREE_PUBLIC set.
1888 If this function decides to place DECL in COMDAT, it will set
1889 appropriate flags -- but will not clear DECL_EXTERNAL. It is up to
1890 the caller to decide whether or not to clear DECL_EXTERNAL. Some
1891 callers defer that decision until it is clear that DECL is actually
1895 import_export_decl (tree decl
)
1900 tree class_type
= NULL_TREE
;
1902 if (DECL_INTERFACE_KNOWN (decl
))
1905 /* We cannot determine what linkage to give to an entity with vague
1906 linkage until the end of the file. For example, a virtual table
1907 for a class will be defined if and only if the key method is
1908 defined in this translation unit. As a further example, consider
1909 that when compiling a translation unit that uses PCH file with
1910 "-frepo" it would be incorrect to make decisions about what
1911 entities to emit when building the PCH; those decisions must be
1912 delayed until the repository information has been processed. */
1913 gcc_assert (at_eof
);
1914 /* Object file linkage for explicit instantiations is handled in
1915 mark_decl_instantiated. For static variables in functions with
1916 vague linkage, maybe_commonize_var is used.
1918 Therefore, the only declarations that should be provided to this
1919 function are those with external linkage that are:
1921 * implicit instantiations of function templates
1925 * implicit instantiations of static data members of class
1932 Furthermore, all entities that reach this point must have a
1933 definition available in this translation unit.
1935 The following assertions check these conditions. */
1936 gcc_assert (TREE_CODE (decl
) == FUNCTION_DECL
1937 || TREE_CODE (decl
) == VAR_DECL
);
1938 /* Any code that creates entities with TREE_PUBLIC cleared should
1939 also set DECL_INTERFACE_KNOWN. */
1940 gcc_assert (TREE_PUBLIC (decl
));
1941 if (TREE_CODE (decl
) == FUNCTION_DECL
)
1942 gcc_assert (DECL_IMPLICIT_INSTANTIATION (decl
)
1943 || DECL_FRIEND_PSEUDO_TEMPLATE_INSTANTIATION (decl
)
1944 || DECL_DECLARED_INLINE_P (decl
));
1946 gcc_assert (DECL_IMPLICIT_INSTANTIATION (decl
)
1947 || DECL_VTABLE_OR_VTT_P (decl
)
1948 || DECL_TINFO_P (decl
));
1949 /* Check that a definition of DECL is available in this translation
1951 gcc_assert (!DECL_REALLY_EXTERN (decl
));
1953 /* Assume that DECL will not have COMDAT linkage. */
1955 /* Assume that DECL will not be imported into this translation
1959 /* See if the repository tells us whether or not to emit DECL in
1960 this translation unit. */
1961 emit_p
= repo_emit_p (decl
);
1964 else if (emit_p
== 1)
1966 /* The repository indicates that this entity should be defined
1967 here. Make sure the back end honors that request. */
1968 if (TREE_CODE (decl
) == VAR_DECL
)
1970 else if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (decl
)
1971 || DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P (decl
))
1974 FOR_EACH_CLONE (clone
, decl
)
1975 mark_needed (clone
);
1979 /* Output the definition as an ordinary strong definition. */
1980 DECL_EXTERNAL (decl
) = 0;
1981 DECL_INTERFACE_KNOWN (decl
) = 1;
1986 /* We have already decided what to do with this DECL; there is no
1987 need to check anything further. */
1989 else if (TREE_CODE (decl
) == VAR_DECL
&& DECL_VTABLE_OR_VTT_P (decl
))
1991 class_type
= DECL_CONTEXT (decl
);
1992 import_export_class (class_type
);
1993 if (TYPE_FOR_JAVA (class_type
))
1995 else if (CLASSTYPE_INTERFACE_KNOWN (class_type
)
1996 && CLASSTYPE_INTERFACE_ONLY (class_type
))
1998 else if ((!flag_weak
|| TARGET_WEAK_NOT_IN_ARCHIVE_TOC
)
1999 && !CLASSTYPE_USE_TEMPLATE (class_type
)
2000 && CLASSTYPE_KEY_METHOD (class_type
)
2001 && !DECL_DECLARED_INLINE_P (CLASSTYPE_KEY_METHOD (class_type
)))
2002 /* The ABI requires that all virtual tables be emitted with
2003 COMDAT linkage. However, on systems where COMDAT symbols
2004 don't show up in the table of contents for a static
2005 archive, or on systems without weak symbols (where we
2006 approximate COMDAT linkage by using internal linkage), the
2007 linker will report errors about undefined symbols because
2008 it will not see the virtual table definition. Therefore,
2009 in the case that we know that the virtual table will be
2010 emitted in only one translation unit, we make the virtual
2011 table an ordinary definition with external linkage. */
2012 DECL_EXTERNAL (decl
) = 0;
2013 else if (CLASSTYPE_INTERFACE_KNOWN (class_type
))
2015 /* CLASS_TYPE is being exported from this translation unit,
2016 so DECL should be defined here. */
2017 if (!flag_weak
&& CLASSTYPE_EXPLICIT_INSTANTIATION (class_type
))
2018 /* If a class is declared in a header with the "extern
2019 template" extension, then it will not be instantiated,
2020 even in translation units that would normally require
2021 it. Often such classes are explicitly instantiated in
2022 one translation unit. Therefore, the explicit
2023 instantiation must be made visible to other translation
2025 DECL_EXTERNAL (decl
) = 0;
2028 /* The generic C++ ABI says that class data is always
2029 COMDAT, even if there is a key function. Some
2030 variants (e.g., the ARM EABI) says that class data
2031 only has COMDAT linkage if the class data might be
2032 emitted in more than one translation unit. When the
2033 key method can be inline and is inline, we still have
2034 to arrange for comdat even though
2035 class_data_always_comdat is false. */
2036 if (!CLASSTYPE_KEY_METHOD (class_type
)
2037 || DECL_DECLARED_INLINE_P (CLASSTYPE_KEY_METHOD (class_type
))
2038 || targetm
.cxx
.class_data_always_comdat ())
2040 /* The ABI requires COMDAT linkage. Normally, we
2041 only emit COMDAT things when they are needed;
2042 make sure that we realize that this entity is
2049 else if (!flag_implicit_templates
2050 && CLASSTYPE_IMPLICIT_INSTANTIATION (class_type
))
2055 else if (TREE_CODE (decl
) == VAR_DECL
&& DECL_TINFO_P (decl
))
2057 tree type
= TREE_TYPE (DECL_NAME (decl
));
2058 if (CLASS_TYPE_P (type
))
2061 import_export_class (type
);
2062 if (CLASSTYPE_INTERFACE_KNOWN (type
)
2063 && TYPE_POLYMORPHIC_P (type
)
2064 && CLASSTYPE_INTERFACE_ONLY (type
)
2065 /* If -fno-rtti was specified, then we cannot be sure
2066 that RTTI information will be emitted with the
2067 virtual table of the class, so we must emit it
2068 wherever it is used. */
2073 if (CLASSTYPE_INTERFACE_KNOWN (type
)
2074 && !CLASSTYPE_INTERFACE_ONLY (type
))
2076 comdat_p
= (targetm
.cxx
.class_data_always_comdat ()
2077 || (CLASSTYPE_KEY_METHOD (type
)
2078 && DECL_DECLARED_INLINE_P (CLASSTYPE_KEY_METHOD (type
))));
2083 DECL_EXTERNAL (decl
) = 0;
2093 else if (DECL_TEMPLATE_INSTANTIATION (decl
)
2094 || DECL_FRIEND_PSEUDO_TEMPLATE_INSTANTIATION (decl
))
2096 /* DECL is an implicit instantiation of a function or static
2098 if (flag_implicit_templates
2099 || (flag_implicit_inline_templates
2100 && TREE_CODE (decl
) == FUNCTION_DECL
2101 && DECL_DECLARED_INLINE_P (decl
)))
2104 /* If we are not implicitly generating templates, then mark
2105 this entity as undefined in this translation unit. */
2108 else if (DECL_FUNCTION_MEMBER_P (decl
))
2110 if (!DECL_DECLARED_INLINE_P (decl
))
2112 tree ctype
= DECL_CONTEXT (decl
);
2113 import_export_class (ctype
);
2114 if (CLASSTYPE_INTERFACE_KNOWN (ctype
))
2116 DECL_NOT_REALLY_EXTERN (decl
)
2117 = ! (CLASSTYPE_INTERFACE_ONLY (ctype
)
2118 || (DECL_DECLARED_INLINE_P (decl
)
2119 && ! flag_implement_inlines
2120 && !DECL_VINDEX (decl
)));
2122 if (!DECL_NOT_REALLY_EXTERN (decl
))
2123 DECL_EXTERNAL (decl
) = 1;
2125 /* Always make artificials weak. */
2126 if (DECL_ARTIFICIAL (decl
) && flag_weak
)
2129 maybe_make_one_only (decl
);
2140 /* If we are importing DECL into this translation unit, mark is
2141 an undefined here. */
2142 DECL_EXTERNAL (decl
) = 1;
2143 DECL_NOT_REALLY_EXTERN (decl
) = 0;
2147 /* If we decided to put DECL in COMDAT, mark it accordingly at
2149 comdat_linkage (decl
);
2152 DECL_INTERFACE_KNOWN (decl
) = 1;
2155 /* Return an expression that performs the destruction of DECL, which
2156 must be a VAR_DECL whose type has a non-trivial destructor, or is
2157 an array whose (innermost) elements have a non-trivial destructor. */
2160 build_cleanup (tree decl
)
2163 tree type
= TREE_TYPE (decl
);
2165 /* This function should only be called for declarations that really
2166 require cleanups. */
2167 gcc_assert (!TYPE_HAS_TRIVIAL_DESTRUCTOR (type
));
2169 /* Treat all objects with destructors as used; the destructor may do
2170 something substantive. */
2173 if (TREE_CODE (type
) == ARRAY_TYPE
)
2177 cxx_mark_addressable (decl
);
2178 temp
= build1 (ADDR_EXPR
, build_pointer_type (type
), decl
);
2180 temp
= build_delete (TREE_TYPE (temp
), temp
,
2181 sfk_complete_destructor
,
2182 LOOKUP_NORMAL
|LOOKUP_NONVIRTUAL
|LOOKUP_DESTRUCTOR
, 0);
2186 /* Returns the initialization guard variable for the variable DECL,
2187 which has static storage duration. */
2190 get_guard (tree decl
)
2195 sname
= mangle_guard_variable (decl
);
2196 guard
= IDENTIFIER_GLOBAL_VALUE (sname
);
2201 /* We use a type that is big enough to contain a mutex as well
2202 as an integer counter. */
2203 guard_type
= targetm
.cxx
.guard_type ();
2204 guard
= build_decl (VAR_DECL
, sname
, guard_type
);
2206 /* The guard should have the same linkage as what it guards. */
2207 TREE_PUBLIC (guard
) = TREE_PUBLIC (decl
);
2208 TREE_STATIC (guard
) = TREE_STATIC (decl
);
2209 DECL_COMMON (guard
) = DECL_COMMON (decl
);
2210 DECL_ONE_ONLY (guard
) = DECL_ONE_ONLY (decl
);
2211 if (TREE_PUBLIC (decl
))
2212 DECL_WEAK (guard
) = DECL_WEAK (decl
);
2214 DECL_ARTIFICIAL (guard
) = 1;
2215 DECL_IGNORED_P (guard
) = 1;
2216 TREE_USED (guard
) = 1;
2217 pushdecl_top_level_and_finish (guard
, NULL_TREE
);
2222 /* Return those bits of the GUARD variable that should be set when the
2223 guarded entity is actually initialized. */
2226 get_guard_bits (tree guard
)
2228 if (!targetm
.cxx
.guard_mask_bit ())
2230 /* We only set the first byte of the guard, in order to leave room
2231 for a mutex in the high-order bits. */
2232 guard
= build1 (ADDR_EXPR
,
2233 build_pointer_type (TREE_TYPE (guard
)),
2235 guard
= build1 (NOP_EXPR
,
2236 build_pointer_type (char_type_node
),
2238 guard
= build1 (INDIRECT_REF
, char_type_node
, guard
);
2244 /* Return an expression which determines whether or not the GUARD
2245 variable has already been initialized. */
2248 get_guard_cond (tree guard
)
2252 /* Check to see if the GUARD is zero. */
2253 guard
= get_guard_bits (guard
);
2255 /* Mask off all but the low bit. */
2256 if (targetm
.cxx
.guard_mask_bit ())
2258 guard_value
= integer_one_node
;
2259 if (!same_type_p (TREE_TYPE (guard_value
), TREE_TYPE (guard
)))
2260 guard_value
= convert (TREE_TYPE (guard
), guard_value
);
2261 guard
= cp_build_binary_op (BIT_AND_EXPR
, guard
, guard_value
);
2264 guard_value
= integer_zero_node
;
2265 if (!same_type_p (TREE_TYPE (guard_value
), TREE_TYPE (guard
)))
2266 guard_value
= convert (TREE_TYPE (guard
), guard_value
);
2267 return cp_build_binary_op (EQ_EXPR
, guard
, guard_value
);
2270 /* Return an expression which sets the GUARD variable, indicating that
2271 the variable being guarded has been initialized. */
2274 set_guard (tree guard
)
2278 /* Set the GUARD to one. */
2279 guard
= get_guard_bits (guard
);
2280 guard_init
= integer_one_node
;
2281 if (!same_type_p (TREE_TYPE (guard_init
), TREE_TYPE (guard
)))
2282 guard_init
= convert (TREE_TYPE (guard
), guard_init
);
2283 return build_modify_expr (guard
, NOP_EXPR
, guard_init
);
2286 /* Start the process of running a particular set of global constructors
2287 or destructors. Subroutine of do_[cd]tors. */
2290 start_objects (int method_type
, int initp
)
2296 /* Make ctor or dtor function. METHOD_TYPE may be 'I' or 'D'. */
2298 if (initp
!= DEFAULT_INIT_PRIORITY
)
2308 sprintf (type
, "%c%c%.5u", method_type
, joiner
, initp
);
2311 sprintf (type
, "%c", method_type
);
2313 fndecl
= build_lang_decl (FUNCTION_DECL
,
2314 get_file_function_name_long (type
),
2315 build_function_type (void_type_node
,
2317 start_preparsed_function (fndecl
, /*attrs=*/NULL_TREE
, SF_PRE_PARSED
);
2319 /* It can be a static function as long as collect2 does not have
2320 to scan the object file to find its ctor/dtor routine. */
2321 TREE_PUBLIC (current_function_decl
) = ! targetm
.have_ctors_dtors
;
2323 /* Mark this declaration as used to avoid spurious warnings. */
2324 TREE_USED (current_function_decl
) = 1;
2326 /* Mark this function as a global constructor or destructor. */
2327 if (method_type
== 'I')
2328 DECL_GLOBAL_CTOR_P (current_function_decl
) = 1;
2330 DECL_GLOBAL_DTOR_P (current_function_decl
) = 1;
2331 DECL_LANG_SPECIFIC (current_function_decl
)->decl_flags
.u2sel
= 1;
2333 body
= begin_compound_stmt (BCS_FN_BODY
);
2335 /* We cannot allow these functions to be elided, even if they do not
2336 have external linkage. And, there's no point in deferring
2337 compilation of these functions; they're all going to have to be
2339 DECL_INLINE (current_function_decl
) = 0;
2340 DECL_UNINLINABLE (current_function_decl
) = 1;
2345 /* Finish the process of running a particular set of global constructors
2346 or destructors. Subroutine of do_[cd]tors. */
2349 finish_objects (int method_type
, int initp
, tree body
)
2354 finish_compound_stmt (body
);
2355 fn
= finish_function (0);
2356 expand_or_defer_fn (fn
);
2358 /* When only doing semantic analysis, and no RTL generation, we
2359 can't call functions that directly emit assembly code; there is
2360 no assembly file in which to put the code. */
2361 if (flag_syntax_only
)
2364 if (targetm
.have_ctors_dtors
)
2366 rtx fnsym
= XEXP (DECL_RTL (fn
), 0);
2367 cgraph_mark_needed_node (cgraph_node (fn
));
2368 if (method_type
== 'I')
2369 (* targetm
.asm_out
.constructor
) (fnsym
, initp
);
2371 (* targetm
.asm_out
.destructor
) (fnsym
, initp
);
2375 /* The names of the parameters to the function created to handle
2376 initializations and destructions for objects with static storage
2378 #define INITIALIZE_P_IDENTIFIER "__initialize_p"
2379 #define PRIORITY_IDENTIFIER "__priority"
2381 /* The name of the function we create to handle initializations and
2382 destructions for objects with static storage duration. */
2383 #define SSDF_IDENTIFIER "__static_initialization_and_destruction"
2385 /* The declaration for the __INITIALIZE_P argument. */
2386 static GTY(()) tree initialize_p_decl
;
2388 /* The declaration for the __PRIORITY argument. */
2389 static GTY(()) tree priority_decl
;
2391 /* The declaration for the static storage duration function. */
2392 static GTY(()) tree ssdf_decl
;
2394 /* All the static storage duration functions created in this
2395 translation unit. */
2396 static GTY(()) VEC(tree
,gc
) *ssdf_decls
;
2398 /* A map from priority levels to information about that priority
2399 level. There may be many such levels, so efficient lookup is
2401 static splay_tree priority_info_map
;
2403 /* Begins the generation of the function that will handle all
2404 initialization and destruction of objects with static storage
2405 duration. The function generated takes two parameters of type
2406 `int': __INITIALIZE_P and __PRIORITY. If __INITIALIZE_P is
2407 nonzero, it performs initializations. Otherwise, it performs
2408 destructions. It only performs those initializations or
2409 destructions with the indicated __PRIORITY. The generated function
2412 It is assumed that this function will only be called once per
2413 translation unit. */
2416 start_static_storage_duration_function (unsigned count
)
2421 char id
[sizeof (SSDF_IDENTIFIER
) + 1 /* '\0' */ + 32];
2423 /* Create the identifier for this function. It will be of the form
2424 SSDF_IDENTIFIER_<number>. */
2425 sprintf (id
, "%s_%u", SSDF_IDENTIFIER
, count
);
2427 /* Create the parameters. */
2428 parm_types
= void_list_node
;
2429 parm_types
= tree_cons (NULL_TREE
, integer_type_node
, parm_types
);
2430 parm_types
= tree_cons (NULL_TREE
, integer_type_node
, parm_types
);
2431 type
= build_function_type (void_type_node
, parm_types
);
2433 /* Create the FUNCTION_DECL itself. */
2434 ssdf_decl
= build_lang_decl (FUNCTION_DECL
,
2435 get_identifier (id
),
2437 TREE_PUBLIC (ssdf_decl
) = 0;
2438 DECL_ARTIFICIAL (ssdf_decl
) = 1;
2440 /* Put this function in the list of functions to be called from the
2441 static constructors and destructors. */
2444 ssdf_decls
= VEC_alloc (tree
, gc
, 32);
2446 /* Take this opportunity to initialize the map from priority
2447 numbers to information about that priority level. */
2448 priority_info_map
= splay_tree_new (splay_tree_compare_ints
,
2449 /*delete_key_fn=*/0,
2450 /*delete_value_fn=*/
2451 (splay_tree_delete_value_fn
) &free
);
2453 /* We always need to generate functions for the
2454 DEFAULT_INIT_PRIORITY so enter it now. That way when we walk
2455 priorities later, we'll be sure to find the
2456 DEFAULT_INIT_PRIORITY. */
2457 get_priority_info (DEFAULT_INIT_PRIORITY
);
2460 VEC_safe_push (tree
, gc
, ssdf_decls
, ssdf_decl
);
2462 /* Create the argument list. */
2463 initialize_p_decl
= cp_build_parm_decl
2464 (get_identifier (INITIALIZE_P_IDENTIFIER
), integer_type_node
);
2465 DECL_CONTEXT (initialize_p_decl
) = ssdf_decl
;
2466 TREE_USED (initialize_p_decl
) = 1;
2467 priority_decl
= cp_build_parm_decl
2468 (get_identifier (PRIORITY_IDENTIFIER
), integer_type_node
);
2469 DECL_CONTEXT (priority_decl
) = ssdf_decl
;
2470 TREE_USED (priority_decl
) = 1;
2472 TREE_CHAIN (initialize_p_decl
) = priority_decl
;
2473 DECL_ARGUMENTS (ssdf_decl
) = initialize_p_decl
;
2475 /* Put the function in the global scope. */
2476 pushdecl (ssdf_decl
);
2478 /* Start the function itself. This is equivalent to declaring the
2481 static void __ssdf (int __initialize_p, init __priority_p);
2483 It is static because we only need to call this function from the
2484 various constructor and destructor functions for this module. */
2485 start_preparsed_function (ssdf_decl
,
2486 /*attrs=*/NULL_TREE
,
2489 /* Set up the scope of the outermost block in the function. */
2490 body
= begin_compound_stmt (BCS_FN_BODY
);
2492 /* This function must not be deferred because we are depending on
2493 its compilation to tell us what is TREE_SYMBOL_REFERENCED. */
2494 DECL_INLINE (ssdf_decl
) = 0;
2495 DECL_UNINLINABLE (ssdf_decl
) = 1;
2500 /* Finish the generation of the function which performs initialization
2501 and destruction of objects with static storage duration. After
2502 this point, no more such objects can be created. */
2505 finish_static_storage_duration_function (tree body
)
2507 /* Close out the function. */
2508 finish_compound_stmt (body
);
2509 expand_or_defer_fn (finish_function (0));
2512 /* Return the information about the indicated PRIORITY level. If no
2513 code to handle this level has yet been generated, generate the
2514 appropriate prologue. */
2516 static priority_info
2517 get_priority_info (int priority
)
2522 n
= splay_tree_lookup (priority_info_map
,
2523 (splay_tree_key
) priority
);
2526 /* Create a new priority information structure, and insert it
2528 pi
= XNEW (struct priority_info_s
);
2529 pi
->initializations_p
= 0;
2530 pi
->destructions_p
= 0;
2531 splay_tree_insert (priority_info_map
,
2532 (splay_tree_key
) priority
,
2533 (splay_tree_value
) pi
);
2536 pi
= (priority_info
) n
->value
;
2541 /* The effective initialization priority of a DECL. */
2543 #define DECL_EFFECTIVE_INIT_PRIORITY(decl) \
2544 ((!DECL_HAS_INIT_PRIORITY_P (decl) || DECL_INIT_PRIORITY (decl) == 0) \
2545 ? DEFAULT_INIT_PRIORITY : DECL_INIT_PRIORITY (decl))
2547 /* Whether a DECL needs a guard to protect it against multiple
2550 #define NEEDS_GUARD_P(decl) (TREE_PUBLIC (decl) && (DECL_COMMON (decl) \
2551 || DECL_ONE_ONLY (decl) \
2552 || DECL_WEAK (decl)))
2554 /* Set up to handle the initialization or destruction of DECL. If
2555 INITP is nonzero, we are initializing the variable. Otherwise, we
2556 are destroying it. */
2559 one_static_initialization_or_destruction (tree decl
, tree init
, bool initp
)
2561 tree guard_if_stmt
= NULL_TREE
;
2564 /* If we are supposed to destruct and there's a trivial destructor,
2565 nothing has to be done. */
2567 && TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl
)))
2570 /* Trick the compiler into thinking we are at the file and line
2571 where DECL was declared so that error-messages make sense, and so
2572 that the debugger will show somewhat sensible file and line
2574 input_location
= DECL_SOURCE_LOCATION (decl
);
2580 Access control for implicit calls to the constructors,
2581 the conversion functions, or the destructor called to
2582 create and destroy a static data member is performed as
2583 if these calls appeared in the scope of the member's
2586 we pretend we are in a static member function of the class of
2587 which the DECL is a member. */
2588 if (member_p (decl
))
2590 DECL_CONTEXT (current_function_decl
) = DECL_CONTEXT (decl
);
2591 DECL_STATIC_FUNCTION_P (current_function_decl
) = 1;
2594 /* Assume we don't need a guard. */
2596 /* We need a guard if this is an object with external linkage that
2597 might be initialized in more than one place. (For example, a
2598 static data member of a template, when the data member requires
2600 if (NEEDS_GUARD_P (decl
))
2604 guard
= get_guard (decl
);
2606 /* When using __cxa_atexit, we just check the GUARD as we would
2607 for a local static. */
2608 if (flag_use_cxa_atexit
)
2610 /* When using __cxa_atexit, we never try to destroy
2611 anything from a static destructor. */
2613 guard_cond
= get_guard_cond (guard
);
2615 /* If we don't have __cxa_atexit, then we will be running
2616 destructors from .fini sections, or their equivalents. So,
2617 we need to know how many times we've tried to initialize this
2618 object. We do initializations only if the GUARD is zero,
2619 i.e., if we are the first to initialize the variable. We do
2620 destructions only if the GUARD is one, i.e., if we are the
2621 last to destroy the variable. */
2624 = cp_build_binary_op (EQ_EXPR
,
2625 build_unary_op (PREINCREMENT_EXPR
,
2631 = cp_build_binary_op (EQ_EXPR
,
2632 build_unary_op (PREDECREMENT_EXPR
,
2637 guard_if_stmt
= begin_if_stmt ();
2638 finish_if_stmt_cond (guard_cond
, guard_if_stmt
);
2642 /* If we're using __cxa_atexit, we have not already set the GUARD,
2643 so we must do so now. */
2644 if (guard
&& initp
&& flag_use_cxa_atexit
)
2645 finish_expr_stmt (set_guard (guard
));
2647 /* Perform the initialization or destruction. */
2651 finish_expr_stmt (init
);
2653 /* If we're using __cxa_atexit, register a function that calls the
2654 destructor for the object. */
2655 if (flag_use_cxa_atexit
)
2656 finish_expr_stmt (register_dtor_fn (decl
));
2659 finish_expr_stmt (build_cleanup (decl
));
2661 /* Finish the guard if-stmt, if necessary. */
2664 finish_then_clause (guard_if_stmt
);
2665 finish_if_stmt (guard_if_stmt
);
2668 /* Now that we're done with DECL we don't need to pretend to be a
2669 member of its class any longer. */
2670 DECL_CONTEXT (current_function_decl
) = NULL_TREE
;
2671 DECL_STATIC_FUNCTION_P (current_function_decl
) = 0;
2674 /* Generate code to do the initialization or destruction of the decls in VARS,
2675 a TREE_LIST of VAR_DECL with static storage duration.
2676 Whether initialization or destruction is performed is specified by INITP. */
2679 do_static_initialization_or_destruction (tree vars
, bool initp
)
2681 tree node
, init_if_stmt
, cond
;
2683 /* Build the outer if-stmt to check for initialization or destruction. */
2684 init_if_stmt
= begin_if_stmt ();
2685 cond
= initp
? integer_one_node
: integer_zero_node
;
2686 cond
= cp_build_binary_op (EQ_EXPR
,
2689 finish_if_stmt_cond (cond
, init_if_stmt
);
2693 tree decl
= TREE_VALUE (node
);
2694 tree priority_if_stmt
;
2698 /* If we don't need a destructor, there's nothing to do. Avoid
2699 creating a possibly empty if-stmt. */
2700 if (!initp
&& TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl
)))
2702 node
= TREE_CHAIN (node
);
2706 /* Remember that we had an initialization or finalization at this
2708 priority
= DECL_EFFECTIVE_INIT_PRIORITY (decl
);
2709 pi
= get_priority_info (priority
);
2711 pi
->initializations_p
= 1;
2713 pi
->destructions_p
= 1;
2715 /* Conditionalize this initialization on being in the right priority
2716 and being initializing/finalizing appropriately. */
2717 priority_if_stmt
= begin_if_stmt ();
2718 cond
= cp_build_binary_op (EQ_EXPR
,
2720 build_int_cst (NULL_TREE
, priority
));
2721 finish_if_stmt_cond (cond
, priority_if_stmt
);
2723 /* Process initializers with same priority. */
2725 && DECL_EFFECTIVE_INIT_PRIORITY (TREE_VALUE (node
)) == priority
;
2726 node
= TREE_CHAIN (node
))
2727 /* Do one initialization or destruction. */
2728 one_static_initialization_or_destruction (TREE_VALUE (node
),
2729 TREE_PURPOSE (node
), initp
);
2731 /* Finish up the priority if-stmt body. */
2732 finish_then_clause (priority_if_stmt
);
2733 finish_if_stmt (priority_if_stmt
);
2737 /* Finish up the init/destruct if-stmt body. */
2738 finish_then_clause (init_if_stmt
);
2739 finish_if_stmt (init_if_stmt
);
2742 /* VARS is a list of variables with static storage duration which may
2743 need initialization and/or finalization. Remove those variables
2744 that don't really need to be initialized or finalized, and return
2745 the resulting list. The order in which the variables appear in
2746 VARS is in reverse order of the order in which they should actually
2747 be initialized. The list we return is in the unreversed order;
2748 i.e., the first variable should be initialized first. */
2751 prune_vars_needing_no_initialization (tree
*vars
)
2754 tree result
= NULL_TREE
;
2759 tree decl
= TREE_VALUE (t
);
2760 tree init
= TREE_PURPOSE (t
);
2762 /* Deal gracefully with error. */
2763 if (decl
== error_mark_node
)
2765 var
= &TREE_CHAIN (t
);
2769 /* The only things that can be initialized are variables. */
2770 gcc_assert (TREE_CODE (decl
) == VAR_DECL
);
2772 /* If this object is not defined, we don't need to do anything
2774 if (DECL_EXTERNAL (decl
))
2776 var
= &TREE_CHAIN (t
);
2780 /* Also, if the initializer already contains errors, we can bail
2782 if (init
&& TREE_CODE (init
) == TREE_LIST
2783 && value_member (error_mark_node
, init
))
2785 var
= &TREE_CHAIN (t
);
2789 /* This variable is going to need initialization and/or
2790 finalization, so we add it to the list. */
2791 *var
= TREE_CHAIN (t
);
2792 TREE_CHAIN (t
) = result
;
2799 /* Make sure we have told the back end about all the variables in
2803 write_out_vars (tree vars
)
2807 for (v
= vars
; v
; v
= TREE_CHAIN (v
))
2809 tree var
= TREE_VALUE (v
);
2810 if (!var_finalized_p (var
))
2812 import_export_decl (var
);
2813 rest_of_decl_compilation (var
, 1, 1);
2818 /* Generate a static constructor (if CONSTRUCTOR_P) or destructor
2819 (otherwise) that will initialize all gobal objects with static
2820 storage duration having the indicated PRIORITY. */
2823 generate_ctor_or_dtor_function (bool constructor_p
, int priority
,
2832 input_location
= *locus
;
2833 #ifdef USE_MAPPED_LOCATION
2839 /* We use `I' to indicate initialization and `D' to indicate
2841 function_key
= constructor_p
? 'I' : 'D';
2843 /* We emit the function lazily, to avoid generating empty
2844 global constructors and destructors. */
2847 /* For Objective-C++, we may need to initialize metadata found in this module.
2848 This must be done _before_ any other static initializations. */
2849 if (c_dialect_objc () && (priority
== DEFAULT_INIT_PRIORITY
)
2850 && constructor_p
&& objc_static_init_needed_p ())
2852 body
= start_objects (function_key
, priority
);
2853 static_ctors
= objc_generate_static_init_call (static_ctors
);
2856 /* Call the static storage duration function with appropriate
2858 for (i
= 0; VEC_iterate (tree
, ssdf_decls
, i
, fndecl
); ++i
)
2860 /* Calls to pure or const functions will expand to nothing. */
2861 if (! (flags_from_decl_or_type (fndecl
) & (ECF_CONST
| ECF_PURE
)))
2864 body
= start_objects (function_key
, priority
);
2866 arguments
= tree_cons (NULL_TREE
,
2867 build_int_cst (NULL_TREE
, priority
),
2869 arguments
= tree_cons (NULL_TREE
,
2870 build_int_cst (NULL_TREE
, constructor_p
),
2872 finish_expr_stmt (build_function_call (fndecl
, arguments
));
2876 /* If we're generating code for the DEFAULT_INIT_PRIORITY, throw in
2877 calls to any functions marked with attributes indicating that
2878 they should be called at initialization- or destruction-time. */
2879 if (priority
== DEFAULT_INIT_PRIORITY
)
2883 for (fns
= constructor_p
? static_ctors
: static_dtors
;
2885 fns
= TREE_CHAIN (fns
))
2887 fndecl
= TREE_VALUE (fns
);
2889 /* Calls to pure/const functions will expand to nothing. */
2890 if (! (flags_from_decl_or_type (fndecl
) & (ECF_CONST
| ECF_PURE
)))
2893 body
= start_objects (function_key
, priority
);
2894 finish_expr_stmt (build_function_call (fndecl
, NULL_TREE
));
2899 /* Close out the function. */
2901 finish_objects (function_key
, priority
, body
);
2904 /* Generate constructor and destructor functions for the priority
2908 generate_ctor_and_dtor_functions_for_priority (splay_tree_node n
, void * data
)
2910 location_t
*locus
= (location_t
*) data
;
2911 int priority
= (int) n
->key
;
2912 priority_info pi
= (priority_info
) n
->value
;
2914 /* Generate the functions themselves, but only if they are really
2916 if (pi
->initializations_p
2917 || (priority
== DEFAULT_INIT_PRIORITY
&& static_ctors
))
2918 generate_ctor_or_dtor_function (/*constructor_p=*/true, priority
, locus
);
2919 if (pi
->destructions_p
2920 || (priority
== DEFAULT_INIT_PRIORITY
&& static_dtors
))
2921 generate_ctor_or_dtor_function (/*constructor_p=*/false, priority
, locus
);
2923 /* Keep iterating. */
2927 /* Called via LANGHOOK_CALLGRAPH_ANALYZE_EXPR. It is supposed to mark
2928 decls referenced from frontend specific constructs; it will be called
2929 only for language-specific tree nodes.
2931 Here we must deal with member pointers. */
2934 cxx_callgraph_analyze_expr (tree
*tp
, int *walk_subtrees ATTRIBUTE_UNUSED
,
2935 tree from ATTRIBUTE_UNUSED
)
2939 switch (TREE_CODE (t
))
2942 if (TYPE_PTRMEMFUNC_P (TREE_TYPE (t
)))
2943 cgraph_mark_needed_node (cgraph_node (PTRMEM_CST_MEMBER (t
)));
2946 if (TREE_CODE (BASELINK_FUNCTIONS (t
)) == FUNCTION_DECL
)
2947 cgraph_mark_needed_node (cgraph_node (BASELINK_FUNCTIONS (t
)));
2950 if (DECL_VTABLE_OR_VTT_P (t
))
2952 /* The ABI requires that all virtual tables be emitted
2953 whenever one of them is. */
2955 for (vtbl
= CLASSTYPE_VTABLES (DECL_CONTEXT (t
));
2957 vtbl
= TREE_CHAIN (vtbl
))
2958 mark_decl_referenced (vtbl
);
2960 else if (DECL_CONTEXT (t
)
2961 && TREE_CODE (DECL_CONTEXT (t
)) == FUNCTION_DECL
)
2962 /* If we need a static variable in a function, then we
2963 need the containing function. */
2964 mark_decl_referenced (DECL_CONTEXT (t
));
2973 /* Java requires that we be able to reference a local address for a
2974 method, and not be confused by PLT entries. If hidden aliases are
2975 supported, emit one for each java function that we've emitted. */
2978 build_java_method_aliases (void)
2980 struct cgraph_node
*node
;
2982 #ifndef HAVE_GAS_HIDDEN
2986 for (node
= cgraph_nodes
; node
; node
= node
->next
)
2988 tree fndecl
= node
->decl
;
2990 if (TREE_ASM_WRITTEN (fndecl
)
2991 && DECL_CONTEXT (fndecl
)
2992 && TYPE_P (DECL_CONTEXT (fndecl
))
2993 && TYPE_FOR_JAVA (DECL_CONTEXT (fndecl
))
2994 && TARGET_USE_LOCAL_THUNK_ALIAS_P (fndecl
))
2996 /* Mangle the name in a predictable way; we need to reference
2997 this from a java compiled object file. */
2998 tree oid
, nid
, alias
;
3002 oid
= DECL_ASSEMBLER_NAME (fndecl
);
3003 oname
= IDENTIFIER_POINTER (oid
);
3004 gcc_assert (oname
[0] == '_' && oname
[1] == 'Z');
3005 nname
= ACONCAT (("_ZGA", oname
+2, NULL
));
3006 nid
= get_identifier (nname
);
3008 alias
= make_alias_for (fndecl
, nid
);
3009 TREE_PUBLIC (alias
) = 1;
3010 DECL_VISIBILITY (alias
) = VISIBILITY_HIDDEN
;
3012 assemble_alias (alias
, oid
);
3017 /* This routine is called from the last rule in yyparse ().
3018 Its job is to create all the code needed to initialize and
3019 destroy the global aggregates. We do the destruction
3020 first, since that way we only need to reverse the decls once. */
3023 cp_finish_file (void)
3029 unsigned ssdf_count
= 0;
3033 locus
= input_location
;
3036 /* Bad parse errors. Just forget about it. */
3037 if (! global_bindings_p () || current_class_type
|| decl_namespace_list
)
3041 c_common_write_pch ();
3043 #ifdef USE_MAPPED_LOCATION
3046 /* Otherwise, GDB can get confused, because in only knows
3047 about source for LINENO-1 lines. */
3051 /* We now have to write out all the stuff we put off writing out.
3054 o Template specializations that we have not yet instantiated,
3055 but which are needed.
3056 o Initialization and destruction for non-local objects with
3057 static storage duration. (Local objects with static storage
3058 duration are initialized when their scope is first entered,
3059 and are cleaned up via atexit.)
3060 o Virtual function tables.
3062 All of these may cause others to be needed. For example,
3063 instantiating one function may cause another to be needed, and
3064 generating the initializer for an object may cause templates to be
3065 instantiated, etc., etc. */
3067 timevar_push (TV_VARCONST
);
3069 emit_support_tinfos ();
3078 /* If there are templates that we've put off instantiating, do
3080 instantiate_pending_templates (retries
);
3083 /* Write out virtual tables as required. Note that writing out
3084 the virtual table for a template class may cause the
3085 instantiation of members of that class. If we write out
3086 vtables then we remove the class from our list so we don't
3087 have to look at it again. */
3089 while (keyed_classes
!= NULL_TREE
3090 && maybe_emit_vtables (TREE_VALUE (keyed_classes
)))
3093 keyed_classes
= TREE_CHAIN (keyed_classes
);
3099 tree next
= TREE_CHAIN (t
);
3103 if (maybe_emit_vtables (TREE_VALUE (next
)))
3106 TREE_CHAIN (t
) = TREE_CHAIN (next
);
3111 next
= TREE_CHAIN (t
);
3115 /* Write out needed type info variables. We have to be careful
3116 looping through unemitted decls, because emit_tinfo_decl may
3117 cause other variables to be needed. New elements will be
3118 appended, and we remove from the vector those that actually
3120 for (i
= VEC_length (tree
, unemitted_tinfo_decls
);
3121 VEC_iterate (tree
, unemitted_tinfo_decls
, --i
, t
);)
3122 if (emit_tinfo_decl (t
))
3125 VEC_unordered_remove (tree
, unemitted_tinfo_decls
, i
);
3128 /* The list of objects with static storage duration is built up
3129 in reverse order. We clear STATIC_AGGREGATES so that any new
3130 aggregates added during the initialization of these will be
3131 initialized in the correct order when we next come around the
3133 vars
= prune_vars_needing_no_initialization (&static_aggregates
);
3137 /* We need to start a new initialization function each time
3138 through the loop. That's because we need to know which
3139 vtables have been referenced, and TREE_SYMBOL_REFERENCED
3140 isn't computed until a function is finished, and written
3141 out. That's a deficiency in the back-end. When this is
3142 fixed, these initialization functions could all become
3143 inline, with resulting performance improvements. */
3146 /* Set the line and file, so that it is obviously not from
3148 input_location
= locus
;
3149 ssdf_body
= start_static_storage_duration_function (ssdf_count
);
3151 /* Make sure the back end knows about all the variables. */
3152 write_out_vars (vars
);
3154 /* First generate code to do all the initializations. */
3156 do_static_initialization_or_destruction (vars
, /*initp=*/true);
3158 /* Then, generate code to do all the destructions. Do these
3159 in reverse order so that the most recently constructed
3160 variable is the first destroyed. If we're using
3161 __cxa_atexit, then we don't need to do this; functions
3162 were registered at initialization time to destroy the
3164 if (!flag_use_cxa_atexit
&& vars
)
3166 vars
= nreverse (vars
);
3167 do_static_initialization_or_destruction (vars
, /*initp=*/false);
3172 /* Finish up the static storage duration function for this
3174 input_location
= locus
;
3175 finish_static_storage_duration_function (ssdf_body
);
3177 /* All those initializations and finalizations might cause
3178 us to need more inline functions, more template
3179 instantiations, etc. */
3182 #ifdef USE_MAPPED_LOCATION
3189 /* Go through the set of inline functions whose bodies have not
3190 been emitted yet. If out-of-line copies of these functions
3191 are required, emit them. */
3192 for (i
= 0; VEC_iterate (tree
, deferred_fns
, i
, decl
); ++i
)
3194 /* Does it need synthesizing? */
3195 if (DECL_ARTIFICIAL (decl
) && ! DECL_INITIAL (decl
)
3196 && (! DECL_REALLY_EXTERN (decl
) || DECL_INLINE (decl
)))
3198 /* Even though we're already at the top-level, we push
3199 there again. That way, when we pop back a few lines
3200 hence, all of our state is restored. Otherwise,
3201 finish_function doesn't clean things up, and we end
3202 up with CURRENT_FUNCTION_DECL set. */
3203 push_to_top_level ();
3204 /* The decl's location will mark where it was first
3205 needed. Save that so synthesize method can indicate
3206 where it was needed from, in case of error */
3207 input_location
= DECL_SOURCE_LOCATION (decl
);
3208 synthesize_method (decl
);
3209 pop_from_top_level ();
3213 if (!DECL_SAVED_TREE (decl
))
3216 /* We lie to the back-end, pretending that some functions
3217 are not defined when they really are. This keeps these
3218 functions from being put out unnecessarily. But, we must
3219 stop lying when the functions are referenced, or if they
3220 are not comdat since they need to be put out now. If
3221 DECL_INTERFACE_KNOWN, then we have already set
3222 DECL_EXTERNAL appropriately, so there's no need to check
3223 again, and we do not want to clear DECL_EXTERNAL if a
3224 previous call to import_export_decl set it.
3226 This is done in a separate for cycle, because if some
3227 deferred function is contained in another deferred
3228 function later in deferred_fns varray,
3229 rest_of_compilation would skip this function and we
3230 really cannot expand the same function twice. */
3231 import_export_decl (decl
);
3232 if (DECL_NOT_REALLY_EXTERN (decl
)
3233 && DECL_INITIAL (decl
)
3234 && decl_needed_p (decl
))
3235 DECL_EXTERNAL (decl
) = 0;
3237 /* If we're going to need to write this function out, and
3238 there's already a body for it, create RTL for it now.
3239 (There might be no body if this is a method we haven't
3240 gotten around to synthesizing yet.) */
3241 if (!DECL_EXTERNAL (decl
)
3242 && decl_needed_p (decl
)
3243 && !TREE_ASM_WRITTEN (decl
)
3244 && !cgraph_node (decl
)->local
.finalized
)
3246 /* We will output the function; no longer consider it in this
3248 DECL_DEFER_OUTPUT (decl
) = 0;
3249 /* Generate RTL for this function now that we know we
3251 expand_or_defer_fn (decl
);
3252 /* If we're compiling -fsyntax-only pretend that this
3253 function has been written out so that we don't try to
3255 if (flag_syntax_only
)
3256 TREE_ASM_WRITTEN (decl
) = 1;
3261 if (walk_namespaces (wrapup_globals_for_namespace
, /*data=*/0))
3264 /* Static data members are just like namespace-scope globals. */
3265 for (i
= 0; VEC_iterate (tree
, pending_statics
, i
, decl
); ++i
)
3267 if (var_finalized_p (decl
) || DECL_REALLY_EXTERN (decl
))
3269 import_export_decl (decl
);
3270 /* If this static data member is needed, provide it to the
3272 if (DECL_NOT_REALLY_EXTERN (decl
) && decl_needed_p (decl
))
3273 DECL_EXTERNAL (decl
) = 0;
3275 if (VEC_length (tree
, pending_statics
) != 0
3276 && wrapup_global_declarations (VEC_address (tree
, pending_statics
),
3277 VEC_length (tree
, pending_statics
)))
3284 /* All used inline functions must have a definition at this point. */
3285 for (i
= 0; VEC_iterate (tree
, deferred_fns
, i
, decl
); ++i
)
3287 if (/* Check online inline functions that were actually used. */
3288 TREE_USED (decl
) && DECL_DECLARED_INLINE_P (decl
)
3289 /* If the definition actually was available here, then the
3290 fact that the function was not defined merely represents
3291 that for some reason (use of a template repository,
3292 #pragma interface, etc.) we decided not to emit the
3294 && !DECL_INITIAL (decl
)
3295 /* An explicit instantiation can be used to specify
3296 that the body is in another unit. It will have
3297 already verified there was a definition. */
3298 && !DECL_EXPLICIT_INSTANTIATION (decl
))
3300 warning (0, "inline function %q+D used but never defined", decl
);
3301 /* Avoid a duplicate warning from check_global_declaration_1. */
3302 TREE_NO_WARNING (decl
) = 1;
3306 /* We give C linkage to static constructors and destructors. */
3307 push_lang_context (lang_name_c
);
3309 /* Generate initialization and destruction functions for all
3310 priorities for which they are required. */
3311 if (priority_info_map
)
3312 splay_tree_foreach (priority_info_map
,
3313 generate_ctor_and_dtor_functions_for_priority
,
3317 /* If we have a ctor or this is obj-c++ and we need a static init,
3318 call generate_ctor_or_dtor_function. */
3319 if (static_ctors
|| (c_dialect_objc () && objc_static_init_needed_p ()))
3320 generate_ctor_or_dtor_function (/*constructor_p=*/true,
3321 DEFAULT_INIT_PRIORITY
, &locus
);
3323 generate_ctor_or_dtor_function (/*constructor_p=*/false,
3324 DEFAULT_INIT_PRIORITY
, &locus
);
3327 /* We're done with the splay-tree now. */
3328 if (priority_info_map
)
3329 splay_tree_delete (priority_info_map
);
3331 /* Generate any missing aliases. */
3332 maybe_apply_pending_pragma_weaks ();
3334 /* We're done with static constructors, so we can go back to "C++"
3336 pop_lang_context ();
3338 cgraph_finalize_compilation_unit ();
3341 /* Now, issue warnings about static, but not defined, functions,
3342 etc., and emit debugging information. */
3343 walk_namespaces (wrapup_globals_for_namespace
, /*data=*/&reconsider
);
3344 if (VEC_length (tree
, pending_statics
) != 0)
3346 check_global_declarations (VEC_address (tree
, pending_statics
),
3347 VEC_length (tree
, pending_statics
));
3348 emit_debug_global_declarations (VEC_address (tree
, pending_statics
),
3349 VEC_length (tree
, pending_statics
));
3352 /* Generate hidden aliases for Java. */
3353 build_java_method_aliases ();
3357 /* The entire file is now complete. If requested, dump everything
3361 FILE *stream
= dump_begin (TDI_tu
, &flags
);
3365 dump_node (global_namespace
, flags
& ~TDF_SLIM
, stream
);
3366 dump_end (TDI_tu
, stream
);
3370 timevar_pop (TV_VARCONST
);
3372 if (flag_detailed_statistics
)
3374 dump_tree_statistics ();
3375 dump_time_statistics ();
3377 input_location
= locus
;
3379 #ifdef ENABLE_CHECKING
3380 validate_conversion_obstack ();
3381 #endif /* ENABLE_CHECKING */
3384 /* FN is an OFFSET_REF, DOTSTAR_EXPR or MEMBER_REF indicating the
3385 function to call in parse-tree form; it has not yet been
3386 semantically analyzed. ARGS are the arguments to the function.
3387 They have already been semantically analyzed. */
3390 build_offset_ref_call_from_tree (tree fn
, tree args
)
3399 object
= TREE_OPERAND (fn
, 0);
3401 if (processing_template_decl
)
3403 gcc_assert (TREE_CODE (fn
) == DOTSTAR_EXPR
3404 || TREE_CODE (fn
) == MEMBER_REF
);
3405 if (type_dependent_expression_p (fn
)
3406 || any_type_dependent_arguments_p (args
))
3407 return build_min_nt (CALL_EXPR
, fn
, args
, NULL_TREE
);
3409 /* Transform the arguments and add the implicit "this"
3410 parameter. That must be done before the FN is transformed
3411 because we depend on the form of FN. */
3412 args
= build_non_dependent_args (args
);
3413 if (TREE_CODE (fn
) == DOTSTAR_EXPR
)
3414 object
= build_unary_op (ADDR_EXPR
, object
, 0);
3415 object
= build_non_dependent_expr (object
);
3416 args
= tree_cons (NULL_TREE
, object
, args
);
3417 /* Now that the arguments are done, transform FN. */
3418 fn
= build_non_dependent_expr (fn
);
3421 /* A qualified name corresponding to a bound pointer-to-member is
3422 represented as an OFFSET_REF:
3424 struct B { void g(); };
3426 void B::g() { (this->*p)(); } */
3427 if (TREE_CODE (fn
) == OFFSET_REF
)
3429 tree object_addr
= build_unary_op (ADDR_EXPR
, object
, 0);
3430 fn
= TREE_OPERAND (fn
, 1);
3431 fn
= get_member_function_from_ptrfunc (&object_addr
, fn
);
3432 args
= tree_cons (NULL_TREE
, object_addr
, args
);
3435 expr
= build_function_call (fn
, args
);
3436 if (processing_template_decl
&& expr
!= error_mark_node
)
3437 return build_min_non_dep (CALL_EXPR
, expr
, orig_fn
, orig_args
, NULL_TREE
);
3443 check_default_args (tree x
)
3445 tree arg
= TYPE_ARG_TYPES (TREE_TYPE (x
));
3446 bool saw_def
= false;
3447 int i
= 0 - (TREE_CODE (TREE_TYPE (x
)) == METHOD_TYPE
);
3448 for (; arg
&& arg
!= void_list_node
; arg
= TREE_CHAIN (arg
), ++i
)
3450 if (TREE_PURPOSE (arg
))
3454 error ("default argument missing for parameter %P of %q+#D", i
, x
);
3455 TREE_PURPOSE (arg
) = error_mark_node
;
3460 /* Mark DECL (either a _DECL or a BASELINK) as "used" in the program.
3461 If DECL is a specialization or implicitly declared class member,
3462 generate the actual definition. */
3465 mark_used (tree decl
)
3467 HOST_WIDE_INT saved_processing_template_decl
= 0;
3469 /* If DECL is a BASELINK for a single function, then treat it just
3470 like the DECL for the function. Otherwise, if the BASELINK is
3471 for an overloaded function, we don't know which function was
3472 actually used until after overload resolution. */
3473 if (TREE_CODE (decl
) == BASELINK
)
3475 decl
= BASELINK_FUNCTIONS (decl
);
3476 if (really_overloaded_fn (decl
))
3478 decl
= OVL_CURRENT (decl
);
3481 TREE_USED (decl
) = 1;
3482 /* If we don't need a value, then we don't need to synthesize DECL. */
3483 if (skip_evaluation
)
3485 /* Normally, we can wait until instantiation-time to synthesize
3486 DECL. However, if DECL is a static data member initialized with
3487 a constant, we need the value right now because a reference to
3488 such a data member is not value-dependent. */
3489 if (TREE_CODE (decl
) == VAR_DECL
3490 && DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl
)
3491 && DECL_CLASS_SCOPE_P (decl
))
3493 /* Don't try to instantiate members of dependent types. We
3494 cannot just use dependent_type_p here because this function
3495 may be called from fold_non_dependent_expr, and then we may
3496 see dependent types, even though processing_template_decl
3498 if (CLASSTYPE_TEMPLATE_INFO ((DECL_CONTEXT (decl
)))
3499 && uses_template_parms (CLASSTYPE_TI_ARGS (DECL_CONTEXT (decl
))))
3501 /* Pretend that we are not in a template, even if we are, so
3502 that the static data member initializer will be processed. */
3503 saved_processing_template_decl
= processing_template_decl
;
3504 processing_template_decl
= 0;
3507 if (processing_template_decl
)
3510 if (TREE_CODE (decl
) == FUNCTION_DECL
&& DECL_DECLARED_INLINE_P (decl
)
3511 && !TREE_ASM_WRITTEN (decl
))
3512 /* Remember it, so we can check it was defined. */
3514 if (DECL_DEFERRED_FN (decl
))
3517 /* Remember the current location for a function we will end up
3518 synthesizing. Then we can inform the user where it was
3519 required in the case of error. */
3520 if (DECL_ARTIFICIAL (decl
) && DECL_NONSTATIC_MEMBER_FUNCTION_P (decl
)
3521 && !DECL_THUNK_P (decl
))
3522 DECL_SOURCE_LOCATION (decl
) = input_location
;
3524 note_vague_linkage_fn (decl
);
3527 assemble_external (decl
);
3529 /* Is it a synthesized method that needs to be synthesized? */
3530 if (TREE_CODE (decl
) == FUNCTION_DECL
3531 && DECL_NONSTATIC_MEMBER_FUNCTION_P (decl
)
3532 && DECL_ARTIFICIAL (decl
)
3533 && !DECL_THUNK_P (decl
)
3534 && ! DECL_INITIAL (decl
)
3535 /* Kludge: don't synthesize for default args. Unfortunately this
3536 rules out initializers of namespace-scoped objects too, but
3537 it's sort-of ok if the implicit ctor or dtor decl keeps
3538 pointing to the class location. */
3539 && current_function_decl
)
3541 synthesize_method (decl
);
3542 /* If we've already synthesized the method we don't need to
3543 do the instantiation test below. */
3545 else if ((DECL_NON_THUNK_FUNCTION_P (decl
) || TREE_CODE (decl
) == VAR_DECL
)
3546 && DECL_LANG_SPECIFIC (decl
) && DECL_TEMPLATE_INFO (decl
)
3547 && (!DECL_EXPLICIT_INSTANTIATION (decl
)
3548 || (TREE_CODE (decl
) == FUNCTION_DECL
3549 && DECL_INLINE (DECL_TEMPLATE_RESULT
3550 (template_for_substitution (decl
))))
3551 /* We need to instantiate static data members so that there
3552 initializers are available in integral constant
3554 || (TREE_CODE (decl
) == VAR_DECL
3555 && DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl
))))
3556 /* If this is a function or variable that is an instance of some
3557 template, we now know that we will need to actually do the
3558 instantiation. We check that DECL is not an explicit
3559 instantiation because that is not checked in instantiate_decl.
3561 We put off instantiating functions in order to improve compile
3562 times. Maintaining a stack of active functions is expensive,
3563 and the inliner knows to instantiate any functions it might
3564 need. Therefore, we always try to defer instantiation. */
3565 instantiate_decl (decl
, /*defer_ok=*/true,
3566 /*expl_inst_class_mem_p=*/false);
3568 processing_template_decl
= saved_processing_template_decl
;
3571 #include "gt-cp-decl2.h"