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
)
558 if (DECL_USE_TEMPLATE (function
)
559 && !(TREE_CODE (function
) == TEMPLATE_DECL
560 && DECL_TEMPLATE_SPECIALIZATION (function
))
561 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (function
)))
562 /* Since this is a specialization of a member template,
563 we're not going to find the declaration in the class.
566 struct S { template <typename T> void f(T); };
567 template <> void S::f(int);
569 we're not going to find `S::f(int)', but there's no
570 reason we should, either. We let our callers know we didn't
571 find the method, but we don't complain. */
574 /* Basic sanity check: for a template function, the template parameters
575 either were not passed, or they are the same of DECL_TEMPLATE_PARMS. */
576 if (TREE_CODE (function
) == TEMPLATE_DECL
)
578 gcc_assert (!template_parms
579 || comp_template_parms (template_parms
,
580 DECL_TEMPLATE_PARMS (function
)));
581 template_parms
= DECL_TEMPLATE_PARMS (function
);
584 /* OK, is this a definition of a member template? */
585 is_template
= (template_parms
!= NULL_TREE
);
587 /* We must enter the scope here, because conversion operators are
588 named by target type, and type equivalence relies on typenames
589 resolving within the scope of CTYPE. */
590 pushed_scope
= push_scope (ctype
);
591 ix
= class_method_index_for_fn (complete_type (ctype
), function
);
594 VEC(tree
,gc
) *methods
= CLASSTYPE_METHOD_VEC (ctype
);
595 tree fndecls
, fndecl
= 0;
597 const char *format
= NULL
;
599 for (fndecls
= VEC_index (tree
, methods
, ix
);
600 fndecls
; fndecls
= OVL_NEXT (fndecls
))
604 fndecl
= OVL_CURRENT (fndecls
);
605 p1
= TYPE_ARG_TYPES (TREE_TYPE (function
));
606 p2
= TYPE_ARG_TYPES (TREE_TYPE (fndecl
));
608 /* We cannot simply call decls_match because this doesn't
609 work for static member functions that are pretending to
610 be methods, and because the name may have been changed by
613 /* Get rid of the this parameter on functions that become
615 if (DECL_STATIC_FUNCTION_P (fndecl
)
616 && TREE_CODE (TREE_TYPE (function
)) == METHOD_TYPE
)
617 p1
= TREE_CHAIN (p1
);
619 /* A member template definition only matches a member template
621 if (is_template
!= (TREE_CODE (fndecl
) == TEMPLATE_DECL
))
624 if (same_type_p (TREE_TYPE (TREE_TYPE (function
)),
625 TREE_TYPE (TREE_TYPE (fndecl
)))
626 && compparms (p1
, p2
)
628 || comp_template_parms (template_parms
,
629 DECL_TEMPLATE_PARMS (fndecl
)))
630 && (DECL_TEMPLATE_SPECIALIZATION (function
)
631 == DECL_TEMPLATE_SPECIALIZATION (fndecl
))
632 && (!DECL_TEMPLATE_SPECIALIZATION (function
)
633 || (DECL_TI_TEMPLATE (function
)
634 == DECL_TI_TEMPLATE (fndecl
))))
640 pop_scope (pushed_scope
);
641 return OVL_CURRENT (fndecls
);
644 error ("prototype for %q#D does not match any in class %qT",
646 is_conv_op
= DECL_CONV_FN_P (fndecl
);
649 ix
= CLASSTYPE_FIRST_CONVERSION_SLOT
;
650 fndecls
= VEC_index (tree
, methods
, ix
);
653 fndecl
= OVL_CURRENT (fndecls
);
654 fndecls
= OVL_NEXT (fndecls
);
656 if (!fndecls
&& is_conv_op
)
658 if (VEC_length (tree
, methods
) > (size_t) ++ix
)
660 fndecls
= VEC_index (tree
, methods
, ix
);
661 if (!DECL_CONV_FN_P (OVL_CURRENT (fndecls
)))
673 format
= N_("candidates are: %+#D");
675 format
= N_("candidate is: %+#D");
676 error (format
, fndecl
);
679 else if (!COMPLETE_TYPE_P (ctype
))
680 cxx_incomplete_type_error (function
, ctype
);
682 error ("no %q#D member function declared in class %qT",
685 /* If we did not find the method in the class, add it to avoid
686 spurious errors (unless the CTYPE is not yet defined, in which
687 case we'll only confuse ourselves when the function is declared
688 properly within the class. */
689 if (COMPLETE_TYPE_P (ctype
))
690 add_method (ctype
, function
, NULL_TREE
);
693 pop_scope (pushed_scope
);
697 /* DECL is a function with vague linkage. Remember it so that at the
698 end of the translation unit we can decide whether or not to emit
702 note_vague_linkage_fn (tree decl
)
704 if (!DECL_DEFERRED_FN (decl
))
706 DECL_DEFERRED_FN (decl
) = 1;
707 DECL_DEFER_OUTPUT (decl
) = 1;
708 VEC_safe_push (tree
, gc
, deferred_fns
, decl
);
712 /* We have just processed the DECL, which is a static data member.
713 The other parameters are as for cp_finish_decl. */
716 finish_static_data_member_decl (tree decl
,
717 tree init
, bool init_const_expr_p
,
721 DECL_CONTEXT (decl
) = current_class_type
;
723 /* We cannot call pushdecl here, because that would fill in the
724 TREE_CHAIN of our decl. Instead, we modify cp_finish_decl to do
725 the right thing, namely, to put this decl out straight away. */
727 if (! processing_template_decl
)
728 VEC_safe_push (tree
, gc
, pending_statics
, decl
);
730 if (LOCAL_CLASS_P (current_class_type
))
731 pedwarn ("local class %q#T shall not have static data member %q#D",
732 current_class_type
, decl
);
734 /* Static consts need not be initialized in the class definition. */
735 if (init
!= NULL_TREE
&& TYPE_NEEDS_CONSTRUCTING (TREE_TYPE (decl
)))
737 static int explained
= 0;
739 error ("initializer invalid for static member with constructor");
742 error ("(an out of class initialization is required)");
747 /* Force the compiler to know when an uninitialized static const
748 member is being used. */
749 if (CP_TYPE_CONST_P (TREE_TYPE (decl
)) && init
== 0)
750 TREE_USED (decl
) = 1;
751 DECL_INITIAL (decl
) = init
;
752 DECL_IN_AGGR_P (decl
) = 1;
754 cp_finish_decl (decl
, init
, init_const_expr_p
, asmspec_tree
, flags
);
757 /* DECLARATOR and DECLSPECS correspond to a class member. The other
758 parameters are as for cp_finish_decl. Return the DECL for the
759 class member declared. */
762 grokfield (const cp_declarator
*declarator
,
763 cp_decl_specifier_seq
*declspecs
,
764 tree init
, bool init_const_expr_p
,
769 const char *asmspec
= 0;
770 int flags
= LOOKUP_ONLYCONVERTING
;
773 && TREE_CODE (init
) == TREE_LIST
774 && TREE_VALUE (init
) == error_mark_node
775 && TREE_CHAIN (init
) == NULL_TREE
)
778 value
= grokdeclarator (declarator
, declspecs
, FIELD
, init
!= 0, &attrlist
);
779 if (! value
|| error_operand_p (value
))
780 /* friend or constructor went bad. */
781 return error_mark_node
;
783 if (TREE_CODE (value
) == TYPE_DECL
&& init
)
785 error ("typedef %qD is initialized (use __typeof__ instead)", value
);
789 /* Pass friendly classes back. */
790 if (value
== void_type_node
)
793 /* Pass friend decls back. */
794 if ((TREE_CODE (value
) == FUNCTION_DECL
795 || TREE_CODE (value
) == TEMPLATE_DECL
)
796 && DECL_CONTEXT (value
) != current_class_type
)
799 if (DECL_NAME (value
) != NULL_TREE
800 && IDENTIFIER_POINTER (DECL_NAME (value
))[0] == '_'
801 && ! strcmp (IDENTIFIER_POINTER (DECL_NAME (value
)), "_vptr"))
802 error ("member %qD conflicts with virtual function table field name",
805 /* Stash away type declarations. */
806 if (TREE_CODE (value
) == TYPE_DECL
)
808 DECL_NONLOCAL (value
) = 1;
809 DECL_CONTEXT (value
) = current_class_type
;
811 if (processing_template_decl
)
812 value
= push_template_decl (value
);
816 /* Avoid storing attributes in template parameters:
817 tsubst is not ready to handle them. */
818 tree type
= TREE_TYPE (value
);
819 if (TREE_CODE (type
) == TEMPLATE_TYPE_PARM
820 || TREE_CODE (type
) == BOUND_TEMPLATE_TEMPLATE_PARM
)
821 sorry ("applying attributes to template parameters is not implemented");
823 cplus_decl_attributes (&value
, attrlist
, 0);
829 if (DECL_IN_AGGR_P (value
))
831 error ("%qD is already defined in %qT", value
, DECL_CONTEXT (value
));
832 return void_type_node
;
835 if (asmspec_tree
&& asmspec_tree
!= error_mark_node
)
836 asmspec
= TREE_STRING_POINTER (asmspec_tree
);
840 if (TREE_CODE (value
) == FUNCTION_DECL
)
842 /* Initializers for functions are rejected early in the parser.
843 If we get here, it must be a pure specifier for a method. */
844 if (TREE_CODE (TREE_TYPE (value
)) == METHOD_TYPE
)
846 gcc_assert (error_operand_p (init
) || integer_zerop (init
));
847 DECL_PURE_VIRTUAL_P (value
) = 1;
851 gcc_assert (TREE_CODE (TREE_TYPE (value
)) == FUNCTION_TYPE
);
852 error ("initializer specified for static member function %qD",
856 else if (pedantic
&& TREE_CODE (value
) != VAR_DECL
)
857 /* Already complained in grokdeclarator. */
859 else if (!processing_template_decl
)
861 if (TREE_CODE (init
) == CONSTRUCTOR
)
862 init
= digest_init (TREE_TYPE (value
), init
);
864 init
= integral_constant_value (init
);
866 if (init
!= error_mark_node
&& !TREE_CONSTANT (init
))
868 /* We can allow references to things that are effectively
869 static, since references are initialized with the
871 if (TREE_CODE (TREE_TYPE (value
)) != REFERENCE_TYPE
872 || (TREE_STATIC (init
) == 0
873 && (!DECL_P (init
) || DECL_EXTERNAL (init
) == 0)))
875 error ("field initializer is not constant");
876 init
= error_mark_node
;
882 if (processing_template_decl
883 && (TREE_CODE (value
) == VAR_DECL
|| TREE_CODE (value
) == FUNCTION_DECL
))
885 value
= push_template_decl (value
);
886 if (error_operand_p (value
))
887 return error_mark_node
;
891 cplus_decl_attributes (&value
, attrlist
, 0);
893 switch (TREE_CODE (value
))
896 finish_static_data_member_decl (value
, init
, init_const_expr_p
,
897 asmspec_tree
, flags
);
902 error ("%<asm%> specifiers are not permitted on non-static data members");
903 if (DECL_INITIAL (value
) == error_mark_node
)
904 init
= error_mark_node
;
905 cp_finish_decl (value
, init
, /*init_const_expr_p=*/false,
907 DECL_INITIAL (value
) = init
;
908 DECL_IN_AGGR_P (value
) = 1;
913 set_user_assembler_name (value
, asmspec
);
915 cp_finish_decl (value
,
917 /*init_const_expr_p=*/false,
918 asmspec_tree
, flags
);
920 /* Pass friends back this way. */
921 if (DECL_FRIEND_P (value
))
922 return void_type_node
;
924 DECL_IN_AGGR_P (value
) = 1;
933 /* Like `grokfield', but for bitfields.
934 WIDTH is non-NULL for bit fields only, and is an INTEGER_CST node. */
937 grokbitfield (const cp_declarator
*declarator
,
938 cp_decl_specifier_seq
*declspecs
, tree width
)
940 tree value
= grokdeclarator (declarator
, declspecs
, BITFIELD
, 0, NULL
);
942 if (value
== error_mark_node
)
943 return NULL_TREE
; /* friends went bad. */
945 /* Pass friendly classes back. */
946 if (TREE_CODE (value
) == VOID_TYPE
)
947 return void_type_node
;
949 if (!INTEGRAL_TYPE_P (TREE_TYPE (value
))
950 && (POINTER_TYPE_P (value
)
951 || !dependent_type_p (TREE_TYPE (value
))))
953 error ("bit-field %qD with non-integral type", value
);
954 return error_mark_node
;
957 if (TREE_CODE (value
) == TYPE_DECL
)
959 error ("cannot declare %qD to be a bit-field type", value
);
963 /* Usually, finish_struct_1 catches bitfields with invalid types.
964 But, in the case of bitfields with function type, we confuse
965 ourselves into thinking they are member functions, so we must
967 if (TREE_CODE (value
) == FUNCTION_DECL
)
969 error ("cannot declare bit-field %qD with function type",
974 if (DECL_IN_AGGR_P (value
))
976 error ("%qD is already defined in the class %qT", value
,
977 DECL_CONTEXT (value
));
978 return void_type_node
;
981 if (TREE_STATIC (value
))
983 error ("static member %qD cannot be a bit-field", value
);
986 finish_decl (value
, NULL_TREE
, NULL_TREE
);
988 if (width
!= error_mark_node
)
990 constant_expression_warning (width
);
991 DECL_INITIAL (value
) = width
;
992 SET_DECL_C_BIT_FIELD (value
);
995 DECL_IN_AGGR_P (value
) = 1;
1001 cplus_decl_attributes (tree
*decl
, tree attributes
, int flags
)
1003 if (*decl
== NULL_TREE
|| *decl
== void_type_node
1004 || *decl
== error_mark_node
)
1007 if (TREE_CODE (*decl
) == TEMPLATE_DECL
)
1008 decl
= &DECL_TEMPLATE_RESULT (*decl
);
1010 decl_attributes (decl
, attributes
, flags
);
1012 if (TREE_CODE (*decl
) == TYPE_DECL
)
1013 SET_IDENTIFIER_TYPE_VALUE (DECL_NAME (*decl
), TREE_TYPE (*decl
));
1016 /* Walks through the namespace- or function-scope anonymous union
1017 OBJECT, with the indicated TYPE, building appropriate VAR_DECLs.
1018 Returns one of the fields for use in the mangled name. */
1021 build_anon_union_vars (tree type
, tree object
)
1023 tree main_decl
= NULL_TREE
;
1026 /* Rather than write the code to handle the non-union case,
1027 just give an error. */
1028 if (TREE_CODE (type
) != UNION_TYPE
)
1029 error ("anonymous struct not inside named type");
1031 for (field
= TYPE_FIELDS (type
);
1033 field
= TREE_CHAIN (field
))
1038 if (DECL_ARTIFICIAL (field
))
1040 if (TREE_CODE (field
) != FIELD_DECL
)
1042 pedwarn ("%q+#D invalid; an anonymous union can only "
1043 "have non-static data members", field
);
1047 if (TREE_PRIVATE (field
))
1048 pedwarn ("private member %q+#D in anonymous union", field
);
1049 else if (TREE_PROTECTED (field
))
1050 pedwarn ("protected member %q+#D in anonymous union", field
);
1052 if (processing_template_decl
)
1053 ref
= build_min_nt (COMPONENT_REF
, object
,
1054 DECL_NAME (field
), NULL_TREE
);
1056 ref
= build_class_member_access_expr (object
, field
, NULL_TREE
,
1059 if (DECL_NAME (field
))
1063 decl
= build_decl (VAR_DECL
, DECL_NAME (field
), TREE_TYPE (field
));
1065 base
= get_base_address (object
);
1066 TREE_PUBLIC (decl
) = TREE_PUBLIC (base
);
1067 TREE_STATIC (decl
) = TREE_STATIC (base
);
1068 DECL_EXTERNAL (decl
) = DECL_EXTERNAL (base
);
1070 SET_DECL_VALUE_EXPR (decl
, ref
);
1071 DECL_HAS_VALUE_EXPR_P (decl
) = 1;
1073 decl
= pushdecl (decl
);
1075 else if (ANON_AGGR_TYPE_P (TREE_TYPE (field
)))
1076 decl
= build_anon_union_vars (TREE_TYPE (field
), ref
);
1080 if (main_decl
== NULL_TREE
)
1087 /* Finish off the processing of a UNION_TYPE structure. If the union is an
1088 anonymous union, then all members must be laid out together. PUBLIC_P
1089 is nonzero if this union is not declared static. */
1092 finish_anon_union (tree anon_union_decl
)
1098 if (anon_union_decl
== error_mark_node
)
1101 type
= TREE_TYPE (anon_union_decl
);
1102 public_p
= TREE_PUBLIC (anon_union_decl
);
1104 /* The VAR_DECL's context is the same as the TYPE's context. */
1105 DECL_CONTEXT (anon_union_decl
) = DECL_CONTEXT (TYPE_NAME (type
));
1107 if (TYPE_FIELDS (type
) == NULL_TREE
)
1112 error ("namespace-scope anonymous aggregates must be static");
1116 main_decl
= build_anon_union_vars (type
, anon_union_decl
);
1117 if (main_decl
== error_mark_node
)
1119 if (main_decl
== NULL_TREE
)
1121 warning (0, "anonymous union with no members");
1125 if (!processing_template_decl
)
1127 /* Use main_decl to set the mangled name. */
1128 DECL_NAME (anon_union_decl
) = DECL_NAME (main_decl
);
1129 mangle_decl (anon_union_decl
);
1130 DECL_NAME (anon_union_decl
) = NULL_TREE
;
1133 pushdecl (anon_union_decl
);
1134 if (building_stmt_tree ()
1135 && at_function_scope_p ())
1136 add_decl_expr (anon_union_decl
);
1137 else if (!processing_template_decl
)
1138 rest_of_decl_compilation (anon_union_decl
,
1139 toplevel_bindings_p (), at_eof
);
1142 /* Auxiliary functions to make type signatures for
1143 `operator new' and `operator delete' correspond to
1144 what compiler will be expecting. */
1147 coerce_new_type (tree type
)
1150 tree args
= TYPE_ARG_TYPES (type
);
1152 gcc_assert (TREE_CODE (type
) == FUNCTION_TYPE
);
1154 if (!same_type_p (TREE_TYPE (type
), ptr_type_node
))
1157 error ("%<operator new%> must return type %qT", ptr_type_node
);
1160 if (!args
|| args
== void_list_node
1161 || !same_type_p (TREE_VALUE (args
), size_type_node
))
1164 if (args
&& args
!= void_list_node
)
1165 args
= TREE_CHAIN (args
);
1166 pedwarn ("%<operator new%> takes type %<size_t%> (%qT) "
1167 "as first parameter", size_type_node
);
1172 args
= tree_cons (NULL_TREE
, size_type_node
, args
);
1175 type
= build_exception_variant
1176 (build_function_type (ptr_type_node
, args
),
1177 TYPE_RAISES_EXCEPTIONS (type
));
1185 coerce_delete_type (tree type
)
1188 tree args
= TYPE_ARG_TYPES (type
);
1190 gcc_assert (TREE_CODE (type
) == FUNCTION_TYPE
);
1192 if (!same_type_p (TREE_TYPE (type
), void_type_node
))
1195 error ("%<operator delete%> must return type %qT", void_type_node
);
1198 if (!args
|| args
== void_list_node
1199 || !same_type_p (TREE_VALUE (args
), ptr_type_node
))
1202 if (args
&& args
!= void_list_node
)
1203 args
= TREE_CHAIN (args
);
1204 error ("%<operator delete%> takes type %qT as first parameter",
1210 args
= tree_cons (NULL_TREE
, ptr_type_node
, args
);
1213 type
= build_exception_variant
1214 (build_function_type (void_type_node
, args
),
1215 TYPE_RAISES_EXCEPTIONS (type
));
1224 mark_vtable_entries (tree decl
)
1227 unsigned HOST_WIDE_INT idx
;
1229 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (DECL_INITIAL (decl
)),
1234 STRIP_NOPS (fnaddr
);
1236 if (TREE_CODE (fnaddr
) != ADDR_EXPR
1237 && TREE_CODE (fnaddr
) != FDESC_EXPR
)
1238 /* This entry is an offset: a virtual base class offset, a
1239 virtual call offset, an RTTI offset, etc. */
1242 fn
= TREE_OPERAND (fnaddr
, 0);
1243 TREE_ADDRESSABLE (fn
) = 1;
1244 /* When we don't have vcall offsets, we output thunks whenever
1245 we output the vtables that contain them. With vcall offsets,
1246 we know all the thunks we'll need when we emit a virtual
1247 function, so we emit the thunks there instead. */
1248 if (DECL_THUNK_P (fn
))
1249 use_thunk (fn
, /*emit_p=*/0);
1254 /* Set DECL up to have the closest approximation of "initialized common"
1255 linkage available. */
1258 comdat_linkage (tree decl
)
1261 make_decl_one_only (decl
);
1262 else if (TREE_CODE (decl
) == FUNCTION_DECL
1263 || (TREE_CODE (decl
) == VAR_DECL
&& DECL_ARTIFICIAL (decl
)))
1264 /* We can just emit function and compiler-generated variables
1265 statically; having multiple copies is (for the most part) only
1268 There are two correctness issues, however: the address of a
1269 template instantiation with external linkage should be the
1270 same, independent of what translation unit asks for the
1271 address, and this will not hold when we emit multiple copies of
1272 the function. However, there's little else we can do.
1274 Also, by default, the typeinfo implementation assumes that
1275 there will be only one copy of the string used as the name for
1276 each type. Therefore, if weak symbols are unavailable, the
1277 run-time library should perform a more conservative check; it
1278 should perform a string comparison, rather than an address
1280 TREE_PUBLIC (decl
) = 0;
1283 /* Static data member template instantiations, however, cannot
1284 have multiple copies. */
1285 if (DECL_INITIAL (decl
) == 0
1286 || DECL_INITIAL (decl
) == error_mark_node
)
1287 DECL_COMMON (decl
) = 1;
1288 else if (EMPTY_CONSTRUCTOR_P (DECL_INITIAL (decl
)))
1290 DECL_COMMON (decl
) = 1;
1291 DECL_INITIAL (decl
) = error_mark_node
;
1293 else if (!DECL_EXPLICIT_INSTANTIATION (decl
))
1295 /* We can't do anything useful; leave vars for explicit
1297 DECL_EXTERNAL (decl
) = 1;
1298 DECL_NOT_REALLY_EXTERN (decl
) = 0;
1302 if (DECL_LANG_SPECIFIC (decl
))
1303 DECL_COMDAT (decl
) = 1;
1306 /* For win32 we also want to put explicit instantiations in
1307 linkonce sections, so that they will be merged with implicit
1308 instantiations; otherwise we get duplicate symbol errors.
1309 For Darwin we do not want explicit instantiations to be
1313 maybe_make_one_only (tree decl
)
1315 /* We used to say that this was not necessary on targets that support weak
1316 symbols, because the implicit instantiations will defer to the explicit
1317 one. However, that's not actually the case in SVR4; a strong definition
1318 after a weak one is an error. Also, not making explicit
1319 instantiations one_only means that we can end up with two copies of
1320 some template instantiations. */
1324 /* We can't set DECL_COMDAT on functions, or cp_finish_file will think
1325 we can get away with not emitting them if they aren't used. We need
1326 to for variables so that cp_finish_decl will update their linkage,
1327 because their DECL_INITIAL may not have been set properly yet. */
1329 if (!TARGET_WEAK_NOT_IN_ARCHIVE_TOC
1330 || (! DECL_EXPLICIT_INSTANTIATION (decl
)
1331 && ! DECL_TEMPLATE_SPECIALIZATION (decl
)))
1333 make_decl_one_only (decl
);
1335 if (TREE_CODE (decl
) == VAR_DECL
)
1337 DECL_COMDAT (decl
) = 1;
1338 /* Mark it needed so we don't forget to emit it. */
1339 mark_decl_referenced (decl
);
1344 /* Determine whether or not we want to specifically import or export CTYPE,
1345 using various heuristics. */
1348 import_export_class (tree ctype
)
1350 /* -1 for imported, 1 for exported. */
1351 int import_export
= 0;
1353 /* It only makes sense to call this function at EOF. The reason is
1354 that this function looks at whether or not the first non-inline
1355 non-abstract virtual member function has been defined in this
1356 translation unit. But, we can't possibly know that until we've
1357 seen the entire translation unit. */
1358 gcc_assert (at_eof
);
1360 if (CLASSTYPE_INTERFACE_KNOWN (ctype
))
1363 /* If MULTIPLE_SYMBOL_SPACES is set and we saw a #pragma interface,
1364 we will have CLASSTYPE_INTERFACE_ONLY set but not
1365 CLASSTYPE_INTERFACE_KNOWN. In that case, we don't want to use this
1366 heuristic because someone will supply a #pragma implementation
1367 elsewhere, and deducing it here would produce a conflict. */
1368 if (CLASSTYPE_INTERFACE_ONLY (ctype
))
1371 if (lookup_attribute ("dllimport", TYPE_ATTRIBUTES (ctype
)))
1373 else if (lookup_attribute ("dllexport", TYPE_ATTRIBUTES (ctype
)))
1375 else if (CLASSTYPE_IMPLICIT_INSTANTIATION (ctype
)
1376 && !flag_implicit_templates
)
1377 /* For a template class, without -fimplicit-templates, check the
1378 repository. If the virtual table is assigned to this
1379 translation unit, then export the class; otherwise, import
1381 import_export
= repo_export_class_p (ctype
) ? 1 : -1;
1382 else if (TYPE_POLYMORPHIC_P (ctype
))
1384 /* The ABI specifies that the virtual table and associated
1385 information are emitted with the key method, if any. */
1386 tree method
= CLASSTYPE_KEY_METHOD (ctype
);
1387 /* If weak symbol support is not available, then we must be
1388 careful not to emit the vtable when the key function is
1389 inline. An inline function can be defined in multiple
1390 translation units. If we were to emit the vtable in each
1391 translation unit containing a definition, we would get
1392 multiple definition errors at link-time. */
1393 if (method
&& (flag_weak
|| ! DECL_DECLARED_INLINE_P (method
)))
1394 import_export
= (DECL_REALLY_EXTERN (method
) ? -1 : 1);
1397 /* When MULTIPLE_SYMBOL_SPACES is set, we cannot count on seeing
1398 a definition anywhere else. */
1399 if (MULTIPLE_SYMBOL_SPACES
&& import_export
== -1)
1402 /* Allow backends the chance to overrule the decision. */
1403 if (targetm
.cxx
.import_export_class
)
1404 import_export
= targetm
.cxx
.import_export_class (ctype
, import_export
);
1408 SET_CLASSTYPE_INTERFACE_KNOWN (ctype
);
1409 CLASSTYPE_INTERFACE_ONLY (ctype
) = (import_export
< 0);
1413 /* Return true if VAR has already been provided to the back end; in that
1414 case VAR should not be modified further by the front end. */
1416 var_finalized_p (tree var
)
1418 return cgraph_varpool_node (var
)->finalized
;
1421 /* DECL is a VAR_DECL or FUNCTION_DECL which, for whatever reason,
1422 must be emitted in this translation unit. Mark it as such. */
1425 mark_needed (tree decl
)
1427 /* It's possible that we no longer need to set
1428 TREE_SYMBOL_REFERENCED here directly, but doing so is
1430 TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
)) = 1;
1431 mark_decl_referenced (decl
);
1434 /* DECL is either a FUNCTION_DECL or a VAR_DECL. This function
1435 returns true if a definition of this entity should be provided in
1436 this object file. Callers use this function to determine whether
1437 or not to let the back end know that a definition of DECL is
1438 available in this translation unit. */
1441 decl_needed_p (tree decl
)
1443 gcc_assert (TREE_CODE (decl
) == VAR_DECL
1444 || TREE_CODE (decl
) == FUNCTION_DECL
);
1445 /* This function should only be called at the end of the translation
1446 unit. We cannot be sure of whether or not something will be
1447 COMDAT until that point. */
1448 gcc_assert (at_eof
);
1450 /* All entities with external linkage that are not COMDAT should be
1451 emitted; they may be referred to from other object files. */
1452 if (TREE_PUBLIC (decl
) && !DECL_COMDAT (decl
))
1454 /* If this entity was used, let the back-end see it; it will decide
1455 whether or not to emit it into the object file. */
1456 if (TREE_USED (decl
)
1457 || (DECL_ASSEMBLER_NAME_SET_P (decl
)
1458 && TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
))))
1460 /* Otherwise, DECL does not need to be emitted -- yet. A subsequent
1461 reference to DECL might cause it to be emitted later. */
1465 /* If necessary, write out the vtables for the dynamic class CTYPE.
1466 Returns true if any vtables were emitted. */
1469 maybe_emit_vtables (tree ctype
)
1475 /* If the vtables for this class have already been emitted there is
1476 nothing more to do. */
1477 primary_vtbl
= CLASSTYPE_VTABLES (ctype
);
1478 if (var_finalized_p (primary_vtbl
))
1480 /* Ignore dummy vtables made by get_vtable_decl. */
1481 if (TREE_TYPE (primary_vtbl
) == void_type_node
)
1484 /* On some targets, we cannot determine the key method until the end
1485 of the translation unit -- which is when this function is
1487 if (!targetm
.cxx
.key_method_may_be_inline ())
1488 determine_key_method (ctype
);
1490 /* See if any of the vtables are needed. */
1491 for (vtbl
= CLASSTYPE_VTABLES (ctype
); vtbl
; vtbl
= TREE_CHAIN (vtbl
))
1493 import_export_decl (vtbl
);
1494 if (DECL_NOT_REALLY_EXTERN (vtbl
) && decl_needed_p (vtbl
))
1499 /* If the references to this class' vtables are optimized away,
1500 still emit the appropriate debugging information. See
1502 if (DECL_COMDAT (primary_vtbl
)
1503 && CLASSTYPE_DEBUG_REQUESTED (ctype
))
1504 note_debug_info_needed (ctype
);
1508 /* The ABI requires that we emit all of the vtables if we emit any
1510 for (vtbl
= CLASSTYPE_VTABLES (ctype
); vtbl
; vtbl
= TREE_CHAIN (vtbl
))
1512 /* Mark entities references from the virtual table as used. */
1513 mark_vtable_entries (vtbl
);
1515 if (TREE_TYPE (DECL_INITIAL (vtbl
)) == 0)
1517 tree expr
= store_init_value (vtbl
, DECL_INITIAL (vtbl
));
1519 /* It had better be all done at compile-time. */
1524 DECL_EXTERNAL (vtbl
) = 0;
1525 rest_of_decl_compilation (vtbl
, 1, 1);
1527 /* Because we're only doing syntax-checking, we'll never end up
1528 actually marking the variable as written. */
1529 if (flag_syntax_only
)
1530 TREE_ASM_WRITTEN (vtbl
) = 1;
1533 /* Since we're writing out the vtable here, also write the debug
1535 note_debug_info_needed (ctype
);
1540 /* A special return value from type_visibility meaning internal
1543 enum { VISIBILITY_ANON
= VISIBILITY_INTERNAL
+1 };
1545 /* walk_tree helper function for type_visibility. */
1548 min_vis_r (tree
*tp
, int *walk_subtrees
, void *data
)
1550 int *vis_p
= (int *)data
;
1555 else if (CLASS_TYPE_P (*tp
))
1557 if (!TREE_PUBLIC (TYPE_MAIN_DECL (*tp
)))
1559 *vis_p
= VISIBILITY_ANON
;
1562 else if (CLASSTYPE_VISIBILITY (*tp
) > *vis_p
)
1563 *vis_p
= CLASSTYPE_VISIBILITY (*tp
);
1568 /* Returns the visibility of TYPE, which is the minimum visibility of its
1572 type_visibility (tree type
)
1574 int vis
= VISIBILITY_DEFAULT
;
1575 walk_tree_without_duplicates (&type
, min_vis_r
, &vis
);
1579 /* Limit the visibility of DECL to VISIBILITY, if not explicitly
1580 specified (or if VISIBILITY is static). */
1583 constrain_visibility (tree decl
, int visibility
)
1585 if (visibility
== VISIBILITY_ANON
)
1587 /* extern "C" declarations aren't affected by the anonymous
1589 if (!DECL_EXTERN_C_P (decl
))
1591 TREE_PUBLIC (decl
) = 0;
1592 DECL_INTERFACE_KNOWN (decl
) = 1;
1593 if (DECL_LANG_SPECIFIC (decl
))
1594 DECL_NOT_REALLY_EXTERN (decl
) = 1;
1597 else if (visibility
> DECL_VISIBILITY (decl
)
1598 && !DECL_VISIBILITY_SPECIFIED (decl
))
1600 DECL_VISIBILITY (decl
) = visibility
;
1606 /* Constrain the visibility of DECL based on the visibility of its template
1610 constrain_visibility_for_template (tree decl
, tree targs
)
1612 /* If this is a template instantiation, check the innermost
1613 template args for visibility constraints. The outer template
1614 args are covered by the class check. */
1615 tree args
= INNERMOST_TEMPLATE_ARGS (targs
);
1617 for (i
= TREE_VEC_LENGTH (args
); i
> 0; --i
)
1621 tree arg
= TREE_VEC_ELT (args
, i
-1);
1623 vis
= type_visibility (arg
);
1624 else if (TREE_TYPE (arg
) && POINTER_TYPE_P (TREE_TYPE (arg
)))
1627 if (TREE_CODE (arg
) == ADDR_EXPR
)
1628 arg
= TREE_OPERAND (arg
, 0);
1629 if (TREE_CODE (arg
) == VAR_DECL
1630 || TREE_CODE (arg
) == FUNCTION_DECL
)
1632 if (! TREE_PUBLIC (arg
))
1633 vis
= VISIBILITY_ANON
;
1635 vis
= DECL_VISIBILITY (arg
);
1639 constrain_visibility (decl
, vis
);
1643 /* Like c_determine_visibility, but with additional C++-specific
1646 Function-scope entities can rely on the function's visibility because
1647 it is set in start_preparsed_function.
1649 Class-scope entities cannot rely on the class's visibility until the end
1650 of the enclosing class definition.
1652 Note that because namespaces have multiple independent definitions,
1653 namespace visibility is handled elsewhere using the #pragma visibility
1654 machinery rather than by decorating the namespace declaration.
1656 The goal is for constraints from the type to give a diagnostic, and
1657 other constraints to be applied silently. */
1660 determine_visibility (tree decl
)
1662 tree class_type
= NULL_TREE
;
1665 /* Remember that all decls get VISIBILITY_DEFAULT when built. */
1667 /* Only relevant for names with external linkage. */
1668 if (!TREE_PUBLIC (decl
))
1671 /* Cloned constructors and destructors get the same visibility as
1672 the underlying function. That should be set up in
1673 maybe_clone_body. */
1674 gcc_assert (!DECL_CLONED_FUNCTION_P (decl
));
1676 if (TREE_CODE (decl
) == TYPE_DECL
)
1678 if (CLASS_TYPE_P (TREE_TYPE (decl
)))
1679 use_template
= CLASSTYPE_USE_TEMPLATE (TREE_TYPE (decl
));
1680 else if (TYPE_TEMPLATE_INFO (TREE_TYPE (decl
)))
1685 else if (DECL_LANG_SPECIFIC (decl
))
1686 use_template
= DECL_USE_TEMPLATE (decl
);
1690 /* Anything that is exported must have default visibility. */
1691 if (TARGET_DLLIMPORT_DECL_ATTRIBUTES
1692 && lookup_attribute ("dllexport",
1693 TREE_CODE (decl
) == TYPE_DECL
1694 ? TYPE_ATTRIBUTES (TREE_TYPE (decl
))
1695 : DECL_ATTRIBUTES (decl
)))
1697 DECL_VISIBILITY (decl
) = VISIBILITY_DEFAULT
;
1698 DECL_VISIBILITY_SPECIFIED (decl
) = 1;
1701 /* If DECL is a member of a class, visibility specifiers on the
1702 class can influence the visibility of the DECL. */
1703 if (DECL_CLASS_SCOPE_P (decl
))
1704 class_type
= DECL_CONTEXT (decl
);
1705 else if (TREE_CODE (decl
) == VAR_DECL
1706 && DECL_TINFO_P (decl
)
1707 && CLASS_TYPE_P (TREE_TYPE (DECL_NAME (decl
))))
1708 class_type
= TREE_TYPE (DECL_NAME (decl
));
1711 /* Not a class member. */
1713 /* Virtual tables have DECL_CONTEXT set to their associated class,
1714 so they are automatically handled above. */
1715 gcc_assert (TREE_CODE (decl
) != VAR_DECL
1716 || !DECL_VTABLE_OR_VTT_P (decl
));
1718 if (DECL_FUNCTION_SCOPE_P (decl
) && ! DECL_VISIBILITY_SPECIFIED (decl
))
1720 /* Local statics and classes get the visibility of their
1721 containing function by default, except that
1722 -fvisibility-inlines-hidden doesn't affect them. */
1723 tree fn
= DECL_CONTEXT (decl
);
1724 if (DECL_VISIBILITY_SPECIFIED (fn
) || ! DECL_CLASS_SCOPE_P (fn
))
1726 DECL_VISIBILITY (decl
) = DECL_VISIBILITY (fn
);
1727 DECL_VISIBILITY_SPECIFIED (decl
) =
1728 DECL_VISIBILITY_SPECIFIED (fn
);
1731 determine_visibility_from_class (decl
, DECL_CONTEXT (fn
));
1733 /* Local classes in templates have CLASSTYPE_USE_TEMPLATE set,
1734 but have no TEMPLATE_INFO, so don't try to check it. */
1737 else if (TREE_CODE (decl
) == VAR_DECL
&& DECL_TINFO_P (decl
))
1739 /* tinfo visibility is based on the type it's for. */
1740 constrain_visibility
1741 (decl
, type_visibility (TREE_TYPE (DECL_NAME (decl
))));
1743 else if (use_template
)
1744 /* Template instantiations and specializations get visibility based
1745 on their template unless they override it with an attribute. */;
1746 else if (! DECL_VISIBILITY_SPECIFIED (decl
))
1748 /* Set default visibility to whatever the user supplied with
1749 #pragma GCC visibility or a namespace visibility attribute. */
1750 DECL_VISIBILITY (decl
) = default_visibility
;
1751 DECL_VISIBILITY_SPECIFIED (decl
) = visibility_options
.inpragma
;
1757 /* If the specialization doesn't specify visibility, use the
1758 visibility from the template. */
1759 tree tinfo
= (TREE_CODE (decl
) == TYPE_DECL
1760 ? TYPE_TEMPLATE_INFO (TREE_TYPE (decl
))
1761 : DECL_TEMPLATE_INFO (decl
));
1762 tree args
= TI_ARGS (tinfo
);
1764 if (args
!= error_mark_node
)
1766 int depth
= TMPL_ARGS_DEPTH (args
);
1767 tree pattern
= DECL_TEMPLATE_RESULT (TI_TEMPLATE (tinfo
));
1769 if (!DECL_VISIBILITY_SPECIFIED (decl
))
1771 DECL_VISIBILITY (decl
) = DECL_VISIBILITY (pattern
);
1772 DECL_VISIBILITY_SPECIFIED (decl
)
1773 = DECL_VISIBILITY_SPECIFIED (pattern
);
1776 /* FIXME should TMPL_ARGS_DEPTH really return 1 for null input? */
1777 if (args
&& depth
> template_class_depth (class_type
))
1778 /* Limit visibility based on its template arguments. */
1779 constrain_visibility_for_template (decl
, args
);
1784 determine_visibility_from_class (decl
, class_type
);
1786 if (decl_anon_ns_mem_p (decl
))
1787 /* Names in an anonymous namespace get internal linkage.
1788 This might change once we implement export. */
1789 constrain_visibility (decl
, VISIBILITY_ANON
);
1790 else if (TREE_CODE (decl
) != TYPE_DECL
)
1792 /* Propagate anonymity from type to decl. */
1793 int tvis
= type_visibility (TREE_TYPE (decl
));
1794 if (tvis
== VISIBILITY_ANON
)
1795 constrain_visibility (decl
, tvis
);
1799 /* By default, static data members and function members receive
1800 the visibility of their containing class. */
1803 determine_visibility_from_class (tree decl
, tree class_type
)
1805 if (visibility_options
.inlines_hidden
1806 /* Don't do this for inline templates; specializations might not be
1807 inline, and we don't want them to inherit the hidden
1808 visibility. We'll set it here for all inline instantiations. */
1809 && !processing_template_decl
1810 && ! DECL_VISIBILITY_SPECIFIED (decl
)
1811 && TREE_CODE (decl
) == FUNCTION_DECL
1812 && DECL_DECLARED_INLINE_P (decl
)
1813 && (! DECL_LANG_SPECIFIC (decl
)
1814 || ! DECL_EXPLICIT_INSTANTIATION (decl
)))
1815 DECL_VISIBILITY (decl
) = VISIBILITY_HIDDEN
;
1816 else if (!DECL_VISIBILITY_SPECIFIED (decl
))
1818 /* Default to the class visibility. */
1819 DECL_VISIBILITY (decl
) = CLASSTYPE_VISIBILITY (class_type
);
1820 DECL_VISIBILITY_SPECIFIED (decl
)
1821 = CLASSTYPE_VISIBILITY_SPECIFIED (class_type
);
1824 /* Give the target a chance to override the visibility associated
1826 if (TREE_CODE (decl
) == VAR_DECL
1827 && (DECL_TINFO_P (decl
)
1828 || (DECL_VTABLE_OR_VTT_P (decl
)
1829 /* Construction virtual tables are not exported because
1830 they cannot be referred to from other object files;
1831 their name is not standardized by the ABI. */
1832 && !DECL_CONSTRUCTION_VTABLE_P (decl
)))
1833 && TREE_PUBLIC (decl
)
1834 && !DECL_REALLY_EXTERN (decl
)
1835 && !DECL_VISIBILITY_SPECIFIED (decl
)
1836 && !CLASSTYPE_VISIBILITY_SPECIFIED (class_type
))
1837 targetm
.cxx
.determine_class_data_visibility (decl
);
1840 /* Constrain the visibility of a class TYPE based on the visibility of its
1841 field types. Warn if any fields require lesser visibility. */
1844 constrain_class_visibility (tree type
)
1850 int vis
= type_visibility (type
);
1852 if (vis
== VISIBILITY_ANON
1853 || DECL_IN_SYSTEM_HEADER (TYPE_MAIN_DECL (type
)))
1856 /* Don't warn about visibility if the class has explicit visibility. */
1857 if (CLASSTYPE_VISIBILITY_SPECIFIED (type
))
1858 vis
= VISIBILITY_INTERNAL
;
1860 for (t
= TYPE_FIELDS (type
); t
; t
= TREE_CHAIN (t
))
1861 if (TREE_CODE (t
) == FIELD_DECL
&& TREE_TYPE (t
) != error_mark_node
)
1863 tree ftype
= strip_array_types (TREE_TYPE (t
));
1864 int subvis
= type_visibility (ftype
);
1866 if (subvis
== VISIBILITY_ANON
)
1868 %qT has a field %qD whose type uses the anonymous namespace",
1870 else if (IS_AGGR_TYPE (ftype
)
1871 && vis
< VISIBILITY_HIDDEN
1872 && subvis
>= VISIBILITY_HIDDEN
)
1873 warning (OPT_Wattributes
, "\
1874 %qT declared with greater visibility than the type of its field %qD",
1878 binfo
= TYPE_BINFO (type
);
1879 for (i
= 0; BINFO_BASE_ITERATE (binfo
, i
, t
); ++i
)
1881 int subvis
= type_visibility (TREE_TYPE (t
));
1883 if (subvis
== VISIBILITY_ANON
)
1885 %qT has a base %qT whose type uses the anonymous namespace",
1886 type
, TREE_TYPE (t
));
1887 else if (vis
< VISIBILITY_HIDDEN
1888 && subvis
>= VISIBILITY_HIDDEN
)
1889 warning (OPT_Wattributes
, "\
1890 %qT declared with greater visibility than its base %qT",
1891 type
, TREE_TYPE (t
));
1895 /* DECL is a FUNCTION_DECL or VAR_DECL. If the object file linkage
1896 for DECL has not already been determined, do so now by setting
1897 DECL_EXTERNAL, DECL_COMDAT and other related flags. Until this
1898 function is called entities with vague linkage whose definitions
1899 are available must have TREE_PUBLIC set.
1901 If this function decides to place DECL in COMDAT, it will set
1902 appropriate flags -- but will not clear DECL_EXTERNAL. It is up to
1903 the caller to decide whether or not to clear DECL_EXTERNAL. Some
1904 callers defer that decision until it is clear that DECL is actually
1908 import_export_decl (tree decl
)
1913 tree class_type
= NULL_TREE
;
1915 if (DECL_INTERFACE_KNOWN (decl
))
1918 /* We cannot determine what linkage to give to an entity with vague
1919 linkage until the end of the file. For example, a virtual table
1920 for a class will be defined if and only if the key method is
1921 defined in this translation unit. As a further example, consider
1922 that when compiling a translation unit that uses PCH file with
1923 "-frepo" it would be incorrect to make decisions about what
1924 entities to emit when building the PCH; those decisions must be
1925 delayed until the repository information has been processed. */
1926 gcc_assert (at_eof
);
1927 /* Object file linkage for explicit instantiations is handled in
1928 mark_decl_instantiated. For static variables in functions with
1929 vague linkage, maybe_commonize_var is used.
1931 Therefore, the only declarations that should be provided to this
1932 function are those with external linkage that are:
1934 * implicit instantiations of function templates
1938 * implicit instantiations of static data members of class
1945 Furthermore, all entities that reach this point must have a
1946 definition available in this translation unit.
1948 The following assertions check these conditions. */
1949 gcc_assert (TREE_CODE (decl
) == FUNCTION_DECL
1950 || TREE_CODE (decl
) == VAR_DECL
);
1951 /* Any code that creates entities with TREE_PUBLIC cleared should
1952 also set DECL_INTERFACE_KNOWN. */
1953 gcc_assert (TREE_PUBLIC (decl
));
1954 if (TREE_CODE (decl
) == FUNCTION_DECL
)
1955 gcc_assert (DECL_IMPLICIT_INSTANTIATION (decl
)
1956 || DECL_FRIEND_PSEUDO_TEMPLATE_INSTANTIATION (decl
)
1957 || DECL_DECLARED_INLINE_P (decl
));
1959 gcc_assert (DECL_IMPLICIT_INSTANTIATION (decl
)
1960 || DECL_VTABLE_OR_VTT_P (decl
)
1961 || DECL_TINFO_P (decl
));
1962 /* Check that a definition of DECL is available in this translation
1964 gcc_assert (!DECL_REALLY_EXTERN (decl
));
1966 /* Assume that DECL will not have COMDAT linkage. */
1968 /* Assume that DECL will not be imported into this translation
1972 /* See if the repository tells us whether or not to emit DECL in
1973 this translation unit. */
1974 emit_p
= repo_emit_p (decl
);
1977 else if (emit_p
== 1)
1979 /* The repository indicates that this entity should be defined
1980 here. Make sure the back end honors that request. */
1981 if (TREE_CODE (decl
) == VAR_DECL
)
1983 else if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (decl
)
1984 || DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P (decl
))
1987 FOR_EACH_CLONE (clone
, decl
)
1988 mark_needed (clone
);
1992 /* Output the definition as an ordinary strong definition. */
1993 DECL_EXTERNAL (decl
) = 0;
1994 DECL_INTERFACE_KNOWN (decl
) = 1;
1999 /* We have already decided what to do with this DECL; there is no
2000 need to check anything further. */
2002 else if (TREE_CODE (decl
) == VAR_DECL
&& DECL_VTABLE_OR_VTT_P (decl
))
2004 class_type
= DECL_CONTEXT (decl
);
2005 import_export_class (class_type
);
2006 if (TYPE_FOR_JAVA (class_type
))
2008 else if (CLASSTYPE_INTERFACE_KNOWN (class_type
)
2009 && CLASSTYPE_INTERFACE_ONLY (class_type
))
2011 else if ((!flag_weak
|| TARGET_WEAK_NOT_IN_ARCHIVE_TOC
)
2012 && !CLASSTYPE_USE_TEMPLATE (class_type
)
2013 && CLASSTYPE_KEY_METHOD (class_type
)
2014 && !DECL_DECLARED_INLINE_P (CLASSTYPE_KEY_METHOD (class_type
)))
2015 /* The ABI requires that all virtual tables be emitted with
2016 COMDAT linkage. However, on systems where COMDAT symbols
2017 don't show up in the table of contents for a static
2018 archive, or on systems without weak symbols (where we
2019 approximate COMDAT linkage by using internal linkage), the
2020 linker will report errors about undefined symbols because
2021 it will not see the virtual table definition. Therefore,
2022 in the case that we know that the virtual table will be
2023 emitted in only one translation unit, we make the virtual
2024 table an ordinary definition with external linkage. */
2025 DECL_EXTERNAL (decl
) = 0;
2026 else if (CLASSTYPE_INTERFACE_KNOWN (class_type
))
2028 /* CLASS_TYPE is being exported from this translation unit,
2029 so DECL should be defined here. */
2030 if (!flag_weak
&& CLASSTYPE_EXPLICIT_INSTANTIATION (class_type
))
2031 /* If a class is declared in a header with the "extern
2032 template" extension, then it will not be instantiated,
2033 even in translation units that would normally require
2034 it. Often such classes are explicitly instantiated in
2035 one translation unit. Therefore, the explicit
2036 instantiation must be made visible to other translation
2038 DECL_EXTERNAL (decl
) = 0;
2041 /* The generic C++ ABI says that class data is always
2042 COMDAT, even if there is a key function. Some
2043 variants (e.g., the ARM EABI) says that class data
2044 only has COMDAT linkage if the class data might be
2045 emitted in more than one translation unit. When the
2046 key method can be inline and is inline, we still have
2047 to arrange for comdat even though
2048 class_data_always_comdat is false. */
2049 if (!CLASSTYPE_KEY_METHOD (class_type
)
2050 || DECL_DECLARED_INLINE_P (CLASSTYPE_KEY_METHOD (class_type
))
2051 || targetm
.cxx
.class_data_always_comdat ())
2053 /* The ABI requires COMDAT linkage. Normally, we
2054 only emit COMDAT things when they are needed;
2055 make sure that we realize that this entity is
2062 else if (!flag_implicit_templates
2063 && CLASSTYPE_IMPLICIT_INSTANTIATION (class_type
))
2068 else if (TREE_CODE (decl
) == VAR_DECL
&& DECL_TINFO_P (decl
))
2070 tree type
= TREE_TYPE (DECL_NAME (decl
));
2071 if (CLASS_TYPE_P (type
))
2074 import_export_class (type
);
2075 if (CLASSTYPE_INTERFACE_KNOWN (type
)
2076 && TYPE_POLYMORPHIC_P (type
)
2077 && CLASSTYPE_INTERFACE_ONLY (type
)
2078 /* If -fno-rtti was specified, then we cannot be sure
2079 that RTTI information will be emitted with the
2080 virtual table of the class, so we must emit it
2081 wherever it is used. */
2086 if (CLASSTYPE_INTERFACE_KNOWN (type
)
2087 && !CLASSTYPE_INTERFACE_ONLY (type
))
2089 comdat_p
= (targetm
.cxx
.class_data_always_comdat ()
2090 || (CLASSTYPE_KEY_METHOD (type
)
2091 && DECL_DECLARED_INLINE_P (CLASSTYPE_KEY_METHOD (type
))));
2096 DECL_EXTERNAL (decl
) = 0;
2106 else if (DECL_TEMPLATE_INSTANTIATION (decl
)
2107 || DECL_FRIEND_PSEUDO_TEMPLATE_INSTANTIATION (decl
))
2109 /* DECL is an implicit instantiation of a function or static
2111 if (flag_implicit_templates
2112 || (flag_implicit_inline_templates
2113 && TREE_CODE (decl
) == FUNCTION_DECL
2114 && DECL_DECLARED_INLINE_P (decl
)))
2117 /* If we are not implicitly generating templates, then mark
2118 this entity as undefined in this translation unit. */
2121 else if (DECL_FUNCTION_MEMBER_P (decl
))
2123 if (!DECL_DECLARED_INLINE_P (decl
))
2125 tree ctype
= DECL_CONTEXT (decl
);
2126 import_export_class (ctype
);
2127 if (CLASSTYPE_INTERFACE_KNOWN (ctype
))
2129 DECL_NOT_REALLY_EXTERN (decl
)
2130 = ! (CLASSTYPE_INTERFACE_ONLY (ctype
)
2131 || (DECL_DECLARED_INLINE_P (decl
)
2132 && ! flag_implement_inlines
2133 && !DECL_VINDEX (decl
)));
2135 if (!DECL_NOT_REALLY_EXTERN (decl
))
2136 DECL_EXTERNAL (decl
) = 1;
2138 /* Always make artificials weak. */
2139 if (DECL_ARTIFICIAL (decl
) && flag_weak
)
2142 maybe_make_one_only (decl
);
2153 /* If we are importing DECL into this translation unit, mark is
2154 an undefined here. */
2155 DECL_EXTERNAL (decl
) = 1;
2156 DECL_NOT_REALLY_EXTERN (decl
) = 0;
2160 /* If we decided to put DECL in COMDAT, mark it accordingly at
2162 comdat_linkage (decl
);
2165 DECL_INTERFACE_KNOWN (decl
) = 1;
2168 /* Return an expression that performs the destruction of DECL, which
2169 must be a VAR_DECL whose type has a non-trivial destructor, or is
2170 an array whose (innermost) elements have a non-trivial destructor. */
2173 build_cleanup (tree decl
)
2176 tree type
= TREE_TYPE (decl
);
2178 /* This function should only be called for declarations that really
2179 require cleanups. */
2180 gcc_assert (!TYPE_HAS_TRIVIAL_DESTRUCTOR (type
));
2182 /* Treat all objects with destructors as used; the destructor may do
2183 something substantive. */
2186 if (TREE_CODE (type
) == ARRAY_TYPE
)
2190 cxx_mark_addressable (decl
);
2191 temp
= build1 (ADDR_EXPR
, build_pointer_type (type
), decl
);
2193 temp
= build_delete (TREE_TYPE (temp
), temp
,
2194 sfk_complete_destructor
,
2195 LOOKUP_NORMAL
|LOOKUP_NONVIRTUAL
|LOOKUP_DESTRUCTOR
, 0);
2199 /* Returns the initialization guard variable for the variable DECL,
2200 which has static storage duration. */
2203 get_guard (tree decl
)
2208 sname
= mangle_guard_variable (decl
);
2209 guard
= IDENTIFIER_GLOBAL_VALUE (sname
);
2214 /* We use a type that is big enough to contain a mutex as well
2215 as an integer counter. */
2216 guard_type
= targetm
.cxx
.guard_type ();
2217 guard
= build_decl (VAR_DECL
, sname
, guard_type
);
2219 /* The guard should have the same linkage as what it guards. */
2220 TREE_PUBLIC (guard
) = TREE_PUBLIC (decl
);
2221 TREE_STATIC (guard
) = TREE_STATIC (decl
);
2222 DECL_COMMON (guard
) = DECL_COMMON (decl
);
2223 DECL_ONE_ONLY (guard
) = DECL_ONE_ONLY (decl
);
2224 if (TREE_PUBLIC (decl
))
2225 DECL_WEAK (guard
) = DECL_WEAK (decl
);
2227 DECL_ARTIFICIAL (guard
) = 1;
2228 DECL_IGNORED_P (guard
) = 1;
2229 TREE_USED (guard
) = 1;
2230 pushdecl_top_level_and_finish (guard
, NULL_TREE
);
2235 /* Return those bits of the GUARD variable that should be set when the
2236 guarded entity is actually initialized. */
2239 get_guard_bits (tree guard
)
2241 if (!targetm
.cxx
.guard_mask_bit ())
2243 /* We only set the first byte of the guard, in order to leave room
2244 for a mutex in the high-order bits. */
2245 guard
= build1 (ADDR_EXPR
,
2246 build_pointer_type (TREE_TYPE (guard
)),
2248 guard
= build1 (NOP_EXPR
,
2249 build_pointer_type (char_type_node
),
2251 guard
= build1 (INDIRECT_REF
, char_type_node
, guard
);
2257 /* Return an expression which determines whether or not the GUARD
2258 variable has already been initialized. */
2261 get_guard_cond (tree guard
)
2265 /* Check to see if the GUARD is zero. */
2266 guard
= get_guard_bits (guard
);
2268 /* Mask off all but the low bit. */
2269 if (targetm
.cxx
.guard_mask_bit ())
2271 guard_value
= integer_one_node
;
2272 if (!same_type_p (TREE_TYPE (guard_value
), TREE_TYPE (guard
)))
2273 guard_value
= convert (TREE_TYPE (guard
), guard_value
);
2274 guard
= cp_build_binary_op (BIT_AND_EXPR
, guard
, guard_value
);
2277 guard_value
= integer_zero_node
;
2278 if (!same_type_p (TREE_TYPE (guard_value
), TREE_TYPE (guard
)))
2279 guard_value
= convert (TREE_TYPE (guard
), guard_value
);
2280 return cp_build_binary_op (EQ_EXPR
, guard
, guard_value
);
2283 /* Return an expression which sets the GUARD variable, indicating that
2284 the variable being guarded has been initialized. */
2287 set_guard (tree guard
)
2291 /* Set the GUARD to one. */
2292 guard
= get_guard_bits (guard
);
2293 guard_init
= integer_one_node
;
2294 if (!same_type_p (TREE_TYPE (guard_init
), TREE_TYPE (guard
)))
2295 guard_init
= convert (TREE_TYPE (guard
), guard_init
);
2296 return build_modify_expr (guard
, NOP_EXPR
, guard_init
);
2299 /* Start the process of running a particular set of global constructors
2300 or destructors. Subroutine of do_[cd]tors. */
2303 start_objects (int method_type
, int initp
)
2309 /* Make ctor or dtor function. METHOD_TYPE may be 'I' or 'D'. */
2311 if (initp
!= DEFAULT_INIT_PRIORITY
)
2321 sprintf (type
, "%c%c%.5u", method_type
, joiner
, initp
);
2324 sprintf (type
, "%c", method_type
);
2326 fndecl
= build_lang_decl (FUNCTION_DECL
,
2327 get_file_function_name (type
),
2328 build_function_type (void_type_node
,
2330 start_preparsed_function (fndecl
, /*attrs=*/NULL_TREE
, SF_PRE_PARSED
);
2332 /* It can be a static function as long as collect2 does not have
2333 to scan the object file to find its ctor/dtor routine. */
2334 TREE_PUBLIC (current_function_decl
) = ! targetm
.have_ctors_dtors
;
2336 /* Mark this declaration as used to avoid spurious warnings. */
2337 TREE_USED (current_function_decl
) = 1;
2339 /* Mark this function as a global constructor or destructor. */
2340 if (method_type
== 'I')
2341 DECL_GLOBAL_CTOR_P (current_function_decl
) = 1;
2343 DECL_GLOBAL_DTOR_P (current_function_decl
) = 1;
2344 DECL_LANG_SPECIFIC (current_function_decl
)->decl_flags
.u2sel
= 1;
2346 body
= begin_compound_stmt (BCS_FN_BODY
);
2348 /* We cannot allow these functions to be elided, even if they do not
2349 have external linkage. And, there's no point in deferring
2350 compilation of these functions; they're all going to have to be
2352 DECL_INLINE (current_function_decl
) = 0;
2353 DECL_UNINLINABLE (current_function_decl
) = 1;
2358 /* Finish the process of running a particular set of global constructors
2359 or destructors. Subroutine of do_[cd]tors. */
2362 finish_objects (int method_type
, int initp
, tree body
)
2367 finish_compound_stmt (body
);
2368 fn
= finish_function (0);
2369 expand_or_defer_fn (fn
);
2371 /* When only doing semantic analysis, and no RTL generation, we
2372 can't call functions that directly emit assembly code; there is
2373 no assembly file in which to put the code. */
2374 if (flag_syntax_only
)
2377 if (targetm
.have_ctors_dtors
)
2379 rtx fnsym
= XEXP (DECL_RTL (fn
), 0);
2380 cgraph_mark_needed_node (cgraph_node (fn
));
2381 if (method_type
== 'I')
2382 (* targetm
.asm_out
.constructor
) (fnsym
, initp
);
2384 (* targetm
.asm_out
.destructor
) (fnsym
, initp
);
2388 /* The names of the parameters to the function created to handle
2389 initializations and destructions for objects with static storage
2391 #define INITIALIZE_P_IDENTIFIER "__initialize_p"
2392 #define PRIORITY_IDENTIFIER "__priority"
2394 /* The name of the function we create to handle initializations and
2395 destructions for objects with static storage duration. */
2396 #define SSDF_IDENTIFIER "__static_initialization_and_destruction"
2398 /* The declaration for the __INITIALIZE_P argument. */
2399 static GTY(()) tree initialize_p_decl
;
2401 /* The declaration for the __PRIORITY argument. */
2402 static GTY(()) tree priority_decl
;
2404 /* The declaration for the static storage duration function. */
2405 static GTY(()) tree ssdf_decl
;
2407 /* All the static storage duration functions created in this
2408 translation unit. */
2409 static GTY(()) VEC(tree
,gc
) *ssdf_decls
;
2411 /* A map from priority levels to information about that priority
2412 level. There may be many such levels, so efficient lookup is
2414 static splay_tree priority_info_map
;
2416 /* Begins the generation of the function that will handle all
2417 initialization and destruction of objects with static storage
2418 duration. The function generated takes two parameters of type
2419 `int': __INITIALIZE_P and __PRIORITY. If __INITIALIZE_P is
2420 nonzero, it performs initializations. Otherwise, it performs
2421 destructions. It only performs those initializations or
2422 destructions with the indicated __PRIORITY. The generated function
2425 It is assumed that this function will only be called once per
2426 translation unit. */
2429 start_static_storage_duration_function (unsigned count
)
2434 char id
[sizeof (SSDF_IDENTIFIER
) + 1 /* '\0' */ + 32];
2436 /* Create the identifier for this function. It will be of the form
2437 SSDF_IDENTIFIER_<number>. */
2438 sprintf (id
, "%s_%u", SSDF_IDENTIFIER
, count
);
2440 /* Create the parameters. */
2441 parm_types
= void_list_node
;
2442 parm_types
= tree_cons (NULL_TREE
, integer_type_node
, parm_types
);
2443 parm_types
= tree_cons (NULL_TREE
, integer_type_node
, parm_types
);
2444 type
= build_function_type (void_type_node
, parm_types
);
2446 /* Create the FUNCTION_DECL itself. */
2447 ssdf_decl
= build_lang_decl (FUNCTION_DECL
,
2448 get_identifier (id
),
2450 TREE_PUBLIC (ssdf_decl
) = 0;
2451 DECL_ARTIFICIAL (ssdf_decl
) = 1;
2453 /* Put this function in the list of functions to be called from the
2454 static constructors and destructors. */
2457 ssdf_decls
= VEC_alloc (tree
, gc
, 32);
2459 /* Take this opportunity to initialize the map from priority
2460 numbers to information about that priority level. */
2461 priority_info_map
= splay_tree_new (splay_tree_compare_ints
,
2462 /*delete_key_fn=*/0,
2463 /*delete_value_fn=*/
2464 (splay_tree_delete_value_fn
) &free
);
2466 /* We always need to generate functions for the
2467 DEFAULT_INIT_PRIORITY so enter it now. That way when we walk
2468 priorities later, we'll be sure to find the
2469 DEFAULT_INIT_PRIORITY. */
2470 get_priority_info (DEFAULT_INIT_PRIORITY
);
2473 VEC_safe_push (tree
, gc
, ssdf_decls
, ssdf_decl
);
2475 /* Create the argument list. */
2476 initialize_p_decl
= cp_build_parm_decl
2477 (get_identifier (INITIALIZE_P_IDENTIFIER
), integer_type_node
);
2478 DECL_CONTEXT (initialize_p_decl
) = ssdf_decl
;
2479 TREE_USED (initialize_p_decl
) = 1;
2480 priority_decl
= cp_build_parm_decl
2481 (get_identifier (PRIORITY_IDENTIFIER
), integer_type_node
);
2482 DECL_CONTEXT (priority_decl
) = ssdf_decl
;
2483 TREE_USED (priority_decl
) = 1;
2485 TREE_CHAIN (initialize_p_decl
) = priority_decl
;
2486 DECL_ARGUMENTS (ssdf_decl
) = initialize_p_decl
;
2488 /* Put the function in the global scope. */
2489 pushdecl (ssdf_decl
);
2491 /* Start the function itself. This is equivalent to declaring the
2494 static void __ssdf (int __initialize_p, init __priority_p);
2496 It is static because we only need to call this function from the
2497 various constructor and destructor functions for this module. */
2498 start_preparsed_function (ssdf_decl
,
2499 /*attrs=*/NULL_TREE
,
2502 /* Set up the scope of the outermost block in the function. */
2503 body
= begin_compound_stmt (BCS_FN_BODY
);
2505 /* This function must not be deferred because we are depending on
2506 its compilation to tell us what is TREE_SYMBOL_REFERENCED. */
2507 DECL_INLINE (ssdf_decl
) = 0;
2508 DECL_UNINLINABLE (ssdf_decl
) = 1;
2513 /* Finish the generation of the function which performs initialization
2514 and destruction of objects with static storage duration. After
2515 this point, no more such objects can be created. */
2518 finish_static_storage_duration_function (tree body
)
2520 /* Close out the function. */
2521 finish_compound_stmt (body
);
2522 expand_or_defer_fn (finish_function (0));
2525 /* Return the information about the indicated PRIORITY level. If no
2526 code to handle this level has yet been generated, generate the
2527 appropriate prologue. */
2529 static priority_info
2530 get_priority_info (int priority
)
2535 n
= splay_tree_lookup (priority_info_map
,
2536 (splay_tree_key
) priority
);
2539 /* Create a new priority information structure, and insert it
2541 pi
= XNEW (struct priority_info_s
);
2542 pi
->initializations_p
= 0;
2543 pi
->destructions_p
= 0;
2544 splay_tree_insert (priority_info_map
,
2545 (splay_tree_key
) priority
,
2546 (splay_tree_value
) pi
);
2549 pi
= (priority_info
) n
->value
;
2554 /* The effective initialization priority of a DECL. */
2556 #define DECL_EFFECTIVE_INIT_PRIORITY(decl) \
2557 ((!DECL_HAS_INIT_PRIORITY_P (decl) || DECL_INIT_PRIORITY (decl) == 0) \
2558 ? DEFAULT_INIT_PRIORITY : DECL_INIT_PRIORITY (decl))
2560 /* Whether a DECL needs a guard to protect it against multiple
2563 #define NEEDS_GUARD_P(decl) (TREE_PUBLIC (decl) && (DECL_COMMON (decl) \
2564 || DECL_ONE_ONLY (decl) \
2565 || DECL_WEAK (decl)))
2567 /* Set up to handle the initialization or destruction of DECL. If
2568 INITP is nonzero, we are initializing the variable. Otherwise, we
2569 are destroying it. */
2572 one_static_initialization_or_destruction (tree decl
, tree init
, bool initp
)
2574 tree guard_if_stmt
= NULL_TREE
;
2577 /* If we are supposed to destruct and there's a trivial destructor,
2578 nothing has to be done. */
2580 && TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl
)))
2583 /* Trick the compiler into thinking we are at the file and line
2584 where DECL was declared so that error-messages make sense, and so
2585 that the debugger will show somewhat sensible file and line
2587 input_location
= DECL_SOURCE_LOCATION (decl
);
2593 Access control for implicit calls to the constructors,
2594 the conversion functions, or the destructor called to
2595 create and destroy a static data member is performed as
2596 if these calls appeared in the scope of the member's
2599 we pretend we are in a static member function of the class of
2600 which the DECL is a member. */
2601 if (member_p (decl
))
2603 DECL_CONTEXT (current_function_decl
) = DECL_CONTEXT (decl
);
2604 DECL_STATIC_FUNCTION_P (current_function_decl
) = 1;
2607 /* Assume we don't need a guard. */
2609 /* We need a guard if this is an object with external linkage that
2610 might be initialized in more than one place. (For example, a
2611 static data member of a template, when the data member requires
2613 if (NEEDS_GUARD_P (decl
))
2617 guard
= get_guard (decl
);
2619 /* When using __cxa_atexit, we just check the GUARD as we would
2620 for a local static. */
2621 if (flag_use_cxa_atexit
)
2623 /* When using __cxa_atexit, we never try to destroy
2624 anything from a static destructor. */
2626 guard_cond
= get_guard_cond (guard
);
2628 /* If we don't have __cxa_atexit, then we will be running
2629 destructors from .fini sections, or their equivalents. So,
2630 we need to know how many times we've tried to initialize this
2631 object. We do initializations only if the GUARD is zero,
2632 i.e., if we are the first to initialize the variable. We do
2633 destructions only if the GUARD is one, i.e., if we are the
2634 last to destroy the variable. */
2637 = cp_build_binary_op (EQ_EXPR
,
2638 build_unary_op (PREINCREMENT_EXPR
,
2644 = cp_build_binary_op (EQ_EXPR
,
2645 build_unary_op (PREDECREMENT_EXPR
,
2650 guard_if_stmt
= begin_if_stmt ();
2651 finish_if_stmt_cond (guard_cond
, guard_if_stmt
);
2655 /* If we're using __cxa_atexit, we have not already set the GUARD,
2656 so we must do so now. */
2657 if (guard
&& initp
&& flag_use_cxa_atexit
)
2658 finish_expr_stmt (set_guard (guard
));
2660 /* Perform the initialization or destruction. */
2664 finish_expr_stmt (init
);
2666 /* If we're using __cxa_atexit, register a function that calls the
2667 destructor for the object. */
2668 if (flag_use_cxa_atexit
)
2669 finish_expr_stmt (register_dtor_fn (decl
));
2672 finish_expr_stmt (build_cleanup (decl
));
2674 /* Finish the guard if-stmt, if necessary. */
2677 finish_then_clause (guard_if_stmt
);
2678 finish_if_stmt (guard_if_stmt
);
2681 /* Now that we're done with DECL we don't need to pretend to be a
2682 member of its class any longer. */
2683 DECL_CONTEXT (current_function_decl
) = NULL_TREE
;
2684 DECL_STATIC_FUNCTION_P (current_function_decl
) = 0;
2687 /* Generate code to do the initialization or destruction of the decls in VARS,
2688 a TREE_LIST of VAR_DECL with static storage duration.
2689 Whether initialization or destruction is performed is specified by INITP. */
2692 do_static_initialization_or_destruction (tree vars
, bool initp
)
2694 tree node
, init_if_stmt
, cond
;
2696 /* Build the outer if-stmt to check for initialization or destruction. */
2697 init_if_stmt
= begin_if_stmt ();
2698 cond
= initp
? integer_one_node
: integer_zero_node
;
2699 cond
= cp_build_binary_op (EQ_EXPR
,
2702 finish_if_stmt_cond (cond
, init_if_stmt
);
2706 tree decl
= TREE_VALUE (node
);
2707 tree priority_if_stmt
;
2711 /* If we don't need a destructor, there's nothing to do. Avoid
2712 creating a possibly empty if-stmt. */
2713 if (!initp
&& TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl
)))
2715 node
= TREE_CHAIN (node
);
2719 /* Remember that we had an initialization or finalization at this
2721 priority
= DECL_EFFECTIVE_INIT_PRIORITY (decl
);
2722 pi
= get_priority_info (priority
);
2724 pi
->initializations_p
= 1;
2726 pi
->destructions_p
= 1;
2728 /* Conditionalize this initialization on being in the right priority
2729 and being initializing/finalizing appropriately. */
2730 priority_if_stmt
= begin_if_stmt ();
2731 cond
= cp_build_binary_op (EQ_EXPR
,
2733 build_int_cst (NULL_TREE
, priority
));
2734 finish_if_stmt_cond (cond
, priority_if_stmt
);
2736 /* Process initializers with same priority. */
2738 && DECL_EFFECTIVE_INIT_PRIORITY (TREE_VALUE (node
)) == priority
;
2739 node
= TREE_CHAIN (node
))
2740 /* Do one initialization or destruction. */
2741 one_static_initialization_or_destruction (TREE_VALUE (node
),
2742 TREE_PURPOSE (node
), initp
);
2744 /* Finish up the priority if-stmt body. */
2745 finish_then_clause (priority_if_stmt
);
2746 finish_if_stmt (priority_if_stmt
);
2750 /* Finish up the init/destruct if-stmt body. */
2751 finish_then_clause (init_if_stmt
);
2752 finish_if_stmt (init_if_stmt
);
2755 /* VARS is a list of variables with static storage duration which may
2756 need initialization and/or finalization. Remove those variables
2757 that don't really need to be initialized or finalized, and return
2758 the resulting list. The order in which the variables appear in
2759 VARS is in reverse order of the order in which they should actually
2760 be initialized. The list we return is in the unreversed order;
2761 i.e., the first variable should be initialized first. */
2764 prune_vars_needing_no_initialization (tree
*vars
)
2767 tree result
= NULL_TREE
;
2772 tree decl
= TREE_VALUE (t
);
2773 tree init
= TREE_PURPOSE (t
);
2775 /* Deal gracefully with error. */
2776 if (decl
== error_mark_node
)
2778 var
= &TREE_CHAIN (t
);
2782 /* The only things that can be initialized are variables. */
2783 gcc_assert (TREE_CODE (decl
) == VAR_DECL
);
2785 /* If this object is not defined, we don't need to do anything
2787 if (DECL_EXTERNAL (decl
))
2789 var
= &TREE_CHAIN (t
);
2793 /* Also, if the initializer already contains errors, we can bail
2795 if (init
&& TREE_CODE (init
) == TREE_LIST
2796 && value_member (error_mark_node
, init
))
2798 var
= &TREE_CHAIN (t
);
2802 /* This variable is going to need initialization and/or
2803 finalization, so we add it to the list. */
2804 *var
= TREE_CHAIN (t
);
2805 TREE_CHAIN (t
) = result
;
2812 /* Make sure we have told the back end about all the variables in
2816 write_out_vars (tree vars
)
2820 for (v
= vars
; v
; v
= TREE_CHAIN (v
))
2822 tree var
= TREE_VALUE (v
);
2823 if (!var_finalized_p (var
))
2825 import_export_decl (var
);
2826 rest_of_decl_compilation (var
, 1, 1);
2831 /* Generate a static constructor (if CONSTRUCTOR_P) or destructor
2832 (otherwise) that will initialize all gobal objects with static
2833 storage duration having the indicated PRIORITY. */
2836 generate_ctor_or_dtor_function (bool constructor_p
, int priority
,
2845 input_location
= *locus
;
2846 #ifdef USE_MAPPED_LOCATION
2852 /* We use `I' to indicate initialization and `D' to indicate
2854 function_key
= constructor_p
? 'I' : 'D';
2856 /* We emit the function lazily, to avoid generating empty
2857 global constructors and destructors. */
2860 /* For Objective-C++, we may need to initialize metadata found in this module.
2861 This must be done _before_ any other static initializations. */
2862 if (c_dialect_objc () && (priority
== DEFAULT_INIT_PRIORITY
)
2863 && constructor_p
&& objc_static_init_needed_p ())
2865 body
= start_objects (function_key
, priority
);
2866 static_ctors
= objc_generate_static_init_call (static_ctors
);
2869 /* Call the static storage duration function with appropriate
2871 for (i
= 0; VEC_iterate (tree
, ssdf_decls
, i
, fndecl
); ++i
)
2873 /* Calls to pure or const functions will expand to nothing. */
2874 if (! (flags_from_decl_or_type (fndecl
) & (ECF_CONST
| ECF_PURE
)))
2877 body
= start_objects (function_key
, priority
);
2879 arguments
= tree_cons (NULL_TREE
,
2880 build_int_cst (NULL_TREE
, priority
),
2882 arguments
= tree_cons (NULL_TREE
,
2883 build_int_cst (NULL_TREE
, constructor_p
),
2885 finish_expr_stmt (build_function_call (fndecl
, arguments
));
2889 /* If we're generating code for the DEFAULT_INIT_PRIORITY, throw in
2890 calls to any functions marked with attributes indicating that
2891 they should be called at initialization- or destruction-time. */
2892 if (priority
== DEFAULT_INIT_PRIORITY
)
2896 for (fns
= constructor_p
? static_ctors
: static_dtors
;
2898 fns
= TREE_CHAIN (fns
))
2900 fndecl
= TREE_VALUE (fns
);
2902 /* Calls to pure/const functions will expand to nothing. */
2903 if (! (flags_from_decl_or_type (fndecl
) & (ECF_CONST
| ECF_PURE
)))
2906 body
= start_objects (function_key
, priority
);
2907 finish_expr_stmt (build_function_call (fndecl
, NULL_TREE
));
2912 /* Close out the function. */
2914 finish_objects (function_key
, priority
, body
);
2917 /* Generate constructor and destructor functions for the priority
2921 generate_ctor_and_dtor_functions_for_priority (splay_tree_node n
, void * data
)
2923 location_t
*locus
= (location_t
*) data
;
2924 int priority
= (int) n
->key
;
2925 priority_info pi
= (priority_info
) n
->value
;
2927 /* Generate the functions themselves, but only if they are really
2929 if (pi
->initializations_p
2930 || (priority
== DEFAULT_INIT_PRIORITY
&& static_ctors
))
2931 generate_ctor_or_dtor_function (/*constructor_p=*/true, priority
, locus
);
2932 if (pi
->destructions_p
2933 || (priority
== DEFAULT_INIT_PRIORITY
&& static_dtors
))
2934 generate_ctor_or_dtor_function (/*constructor_p=*/false, priority
, locus
);
2936 /* Keep iterating. */
2940 /* Called via LANGHOOK_CALLGRAPH_ANALYZE_EXPR. It is supposed to mark
2941 decls referenced from frontend specific constructs; it will be called
2942 only for language-specific tree nodes.
2944 Here we must deal with member pointers. */
2947 cxx_callgraph_analyze_expr (tree
*tp
, int *walk_subtrees ATTRIBUTE_UNUSED
,
2948 tree from ATTRIBUTE_UNUSED
)
2952 switch (TREE_CODE (t
))
2955 if (TYPE_PTRMEMFUNC_P (TREE_TYPE (t
)))
2956 cgraph_mark_needed_node (cgraph_node (PTRMEM_CST_MEMBER (t
)));
2959 if (TREE_CODE (BASELINK_FUNCTIONS (t
)) == FUNCTION_DECL
)
2960 cgraph_mark_needed_node (cgraph_node (BASELINK_FUNCTIONS (t
)));
2963 if (DECL_VTABLE_OR_VTT_P (t
))
2965 /* The ABI requires that all virtual tables be emitted
2966 whenever one of them is. */
2968 for (vtbl
= CLASSTYPE_VTABLES (DECL_CONTEXT (t
));
2970 vtbl
= TREE_CHAIN (vtbl
))
2971 mark_decl_referenced (vtbl
);
2973 else if (DECL_CONTEXT (t
)
2974 && TREE_CODE (DECL_CONTEXT (t
)) == FUNCTION_DECL
)
2975 /* If we need a static variable in a function, then we
2976 need the containing function. */
2977 mark_decl_referenced (DECL_CONTEXT (t
));
2986 /* Java requires that we be able to reference a local address for a
2987 method, and not be confused by PLT entries. If hidden aliases are
2988 supported, emit one for each java function that we've emitted. */
2991 build_java_method_aliases (void)
2993 struct cgraph_node
*node
;
2995 #ifndef HAVE_GAS_HIDDEN
2999 for (node
= cgraph_nodes
; node
; node
= node
->next
)
3001 tree fndecl
= node
->decl
;
3003 if (TREE_ASM_WRITTEN (fndecl
)
3004 && DECL_CONTEXT (fndecl
)
3005 && TYPE_P (DECL_CONTEXT (fndecl
))
3006 && TYPE_FOR_JAVA (DECL_CONTEXT (fndecl
))
3007 && TARGET_USE_LOCAL_THUNK_ALIAS_P (fndecl
))
3009 /* Mangle the name in a predictable way; we need to reference
3010 this from a java compiled object file. */
3011 tree oid
, nid
, alias
;
3015 oid
= DECL_ASSEMBLER_NAME (fndecl
);
3016 oname
= IDENTIFIER_POINTER (oid
);
3017 gcc_assert (oname
[0] == '_' && oname
[1] == 'Z');
3018 nname
= ACONCAT (("_ZGA", oname
+2, NULL
));
3019 nid
= get_identifier (nname
);
3021 alias
= make_alias_for (fndecl
, nid
);
3022 TREE_PUBLIC (alias
) = 1;
3023 DECL_VISIBILITY (alias
) = VISIBILITY_HIDDEN
;
3025 assemble_alias (alias
, oid
);
3030 /* This routine is called at the end of compilation.
3031 Its job is to create all the code needed to initialize and
3032 destroy the global aggregates. We do the destruction
3033 first, since that way we only need to reverse the decls once. */
3036 cp_write_global_declarations (void)
3042 unsigned ssdf_count
= 0;
3046 locus
= input_location
;
3049 /* Bad parse errors. Just forget about it. */
3050 if (! global_bindings_p () || current_class_type
|| decl_namespace_list
)
3054 c_common_write_pch ();
3056 #ifdef USE_MAPPED_LOCATION
3059 /* Otherwise, GDB can get confused, because in only knows
3060 about source for LINENO-1 lines. */
3064 /* We now have to write out all the stuff we put off writing out.
3067 o Template specializations that we have not yet instantiated,
3068 but which are needed.
3069 o Initialization and destruction for non-local objects with
3070 static storage duration. (Local objects with static storage
3071 duration are initialized when their scope is first entered,
3072 and are cleaned up via atexit.)
3073 o Virtual function tables.
3075 All of these may cause others to be needed. For example,
3076 instantiating one function may cause another to be needed, and
3077 generating the initializer for an object may cause templates to be
3078 instantiated, etc., etc. */
3080 timevar_push (TV_VARCONST
);
3082 emit_support_tinfos ();
3091 /* If there are templates that we've put off instantiating, do
3093 instantiate_pending_templates (retries
);
3096 /* Write out virtual tables as required. Note that writing out
3097 the virtual table for a template class may cause the
3098 instantiation of members of that class. If we write out
3099 vtables then we remove the class from our list so we don't
3100 have to look at it again. */
3102 while (keyed_classes
!= NULL_TREE
3103 && maybe_emit_vtables (TREE_VALUE (keyed_classes
)))
3106 keyed_classes
= TREE_CHAIN (keyed_classes
);
3112 tree next
= TREE_CHAIN (t
);
3116 if (maybe_emit_vtables (TREE_VALUE (next
)))
3119 TREE_CHAIN (t
) = TREE_CHAIN (next
);
3124 next
= TREE_CHAIN (t
);
3128 /* Write out needed type info variables. We have to be careful
3129 looping through unemitted decls, because emit_tinfo_decl may
3130 cause other variables to be needed. New elements will be
3131 appended, and we remove from the vector those that actually
3133 for (i
= VEC_length (tree
, unemitted_tinfo_decls
);
3134 VEC_iterate (tree
, unemitted_tinfo_decls
, --i
, t
);)
3135 if (emit_tinfo_decl (t
))
3138 VEC_unordered_remove (tree
, unemitted_tinfo_decls
, i
);
3141 /* The list of objects with static storage duration is built up
3142 in reverse order. We clear STATIC_AGGREGATES so that any new
3143 aggregates added during the initialization of these will be
3144 initialized in the correct order when we next come around the
3146 vars
= prune_vars_needing_no_initialization (&static_aggregates
);
3150 /* We need to start a new initialization function each time
3151 through the loop. That's because we need to know which
3152 vtables have been referenced, and TREE_SYMBOL_REFERENCED
3153 isn't computed until a function is finished, and written
3154 out. That's a deficiency in the back-end. When this is
3155 fixed, these initialization functions could all become
3156 inline, with resulting performance improvements. */
3159 /* Set the line and file, so that it is obviously not from
3161 input_location
= locus
;
3162 ssdf_body
= start_static_storage_duration_function (ssdf_count
);
3164 /* Make sure the back end knows about all the variables. */
3165 write_out_vars (vars
);
3167 /* First generate code to do all the initializations. */
3169 do_static_initialization_or_destruction (vars
, /*initp=*/true);
3171 /* Then, generate code to do all the destructions. Do these
3172 in reverse order so that the most recently constructed
3173 variable is the first destroyed. If we're using
3174 __cxa_atexit, then we don't need to do this; functions
3175 were registered at initialization time to destroy the
3177 if (!flag_use_cxa_atexit
&& vars
)
3179 vars
= nreverse (vars
);
3180 do_static_initialization_or_destruction (vars
, /*initp=*/false);
3185 /* Finish up the static storage duration function for this
3187 input_location
= locus
;
3188 finish_static_storage_duration_function (ssdf_body
);
3190 /* All those initializations and finalizations might cause
3191 us to need more inline functions, more template
3192 instantiations, etc. */
3195 #ifdef USE_MAPPED_LOCATION
3202 /* Go through the set of inline functions whose bodies have not
3203 been emitted yet. If out-of-line copies of these functions
3204 are required, emit them. */
3205 for (i
= 0; VEC_iterate (tree
, deferred_fns
, i
, decl
); ++i
)
3207 /* Does it need synthesizing? */
3208 if (DECL_ARTIFICIAL (decl
) && ! DECL_INITIAL (decl
)
3209 && (! DECL_REALLY_EXTERN (decl
) || DECL_INLINE (decl
)))
3211 /* Even though we're already at the top-level, we push
3212 there again. That way, when we pop back a few lines
3213 hence, all of our state is restored. Otherwise,
3214 finish_function doesn't clean things up, and we end
3215 up with CURRENT_FUNCTION_DECL set. */
3216 push_to_top_level ();
3217 /* The decl's location will mark where it was first
3218 needed. Save that so synthesize method can indicate
3219 where it was needed from, in case of error */
3220 input_location
= DECL_SOURCE_LOCATION (decl
);
3221 synthesize_method (decl
);
3222 pop_from_top_level ();
3226 if (!DECL_SAVED_TREE (decl
))
3229 /* We lie to the back-end, pretending that some functions
3230 are not defined when they really are. This keeps these
3231 functions from being put out unnecessarily. But, we must
3232 stop lying when the functions are referenced, or if they
3233 are not comdat since they need to be put out now. If
3234 DECL_INTERFACE_KNOWN, then we have already set
3235 DECL_EXTERNAL appropriately, so there's no need to check
3236 again, and we do not want to clear DECL_EXTERNAL if a
3237 previous call to import_export_decl set it.
3239 This is done in a separate for cycle, because if some
3240 deferred function is contained in another deferred
3241 function later in deferred_fns varray,
3242 rest_of_compilation would skip this function and we
3243 really cannot expand the same function twice. */
3244 import_export_decl (decl
);
3245 if (DECL_NOT_REALLY_EXTERN (decl
)
3246 && DECL_INITIAL (decl
)
3247 && decl_needed_p (decl
))
3248 DECL_EXTERNAL (decl
) = 0;
3250 /* If we're going to need to write this function out, and
3251 there's already a body for it, create RTL for it now.
3252 (There might be no body if this is a method we haven't
3253 gotten around to synthesizing yet.) */
3254 if (!DECL_EXTERNAL (decl
)
3255 && decl_needed_p (decl
)
3256 && !TREE_ASM_WRITTEN (decl
)
3257 && !cgraph_node (decl
)->local
.finalized
)
3259 /* We will output the function; no longer consider it in this
3261 DECL_DEFER_OUTPUT (decl
) = 0;
3262 /* Generate RTL for this function now that we know we
3264 expand_or_defer_fn (decl
);
3265 /* If we're compiling -fsyntax-only pretend that this
3266 function has been written out so that we don't try to
3268 if (flag_syntax_only
)
3269 TREE_ASM_WRITTEN (decl
) = 1;
3274 if (walk_namespaces (wrapup_globals_for_namespace
, /*data=*/0))
3277 /* Static data members are just like namespace-scope globals. */
3278 for (i
= 0; VEC_iterate (tree
, pending_statics
, i
, decl
); ++i
)
3280 if (var_finalized_p (decl
) || DECL_REALLY_EXTERN (decl
))
3282 import_export_decl (decl
);
3283 /* If this static data member is needed, provide it to the
3285 if (DECL_NOT_REALLY_EXTERN (decl
) && decl_needed_p (decl
))
3286 DECL_EXTERNAL (decl
) = 0;
3288 if (VEC_length (tree
, pending_statics
) != 0
3289 && wrapup_global_declarations (VEC_address (tree
, pending_statics
),
3290 VEC_length (tree
, pending_statics
)))
3297 /* All used inline functions must have a definition at this point. */
3298 for (i
= 0; VEC_iterate (tree
, deferred_fns
, i
, decl
); ++i
)
3300 if (/* Check online inline functions that were actually used. */
3301 TREE_USED (decl
) && DECL_DECLARED_INLINE_P (decl
)
3302 /* If the definition actually was available here, then the
3303 fact that the function was not defined merely represents
3304 that for some reason (use of a template repository,
3305 #pragma interface, etc.) we decided not to emit the
3307 && !DECL_INITIAL (decl
)
3308 /* An explicit instantiation can be used to specify
3309 that the body is in another unit. It will have
3310 already verified there was a definition. */
3311 && !DECL_EXPLICIT_INSTANTIATION (decl
))
3313 warning (0, "inline function %q+D used but never defined", decl
);
3314 /* Avoid a duplicate warning from check_global_declaration_1. */
3315 TREE_NO_WARNING (decl
) = 1;
3319 /* We give C linkage to static constructors and destructors. */
3320 push_lang_context (lang_name_c
);
3322 /* Generate initialization and destruction functions for all
3323 priorities for which they are required. */
3324 if (priority_info_map
)
3325 splay_tree_foreach (priority_info_map
,
3326 generate_ctor_and_dtor_functions_for_priority
,
3330 /* If we have a ctor or this is obj-c++ and we need a static init,
3331 call generate_ctor_or_dtor_function. */
3332 if (static_ctors
|| (c_dialect_objc () && objc_static_init_needed_p ()))
3333 generate_ctor_or_dtor_function (/*constructor_p=*/true,
3334 DEFAULT_INIT_PRIORITY
, &locus
);
3336 generate_ctor_or_dtor_function (/*constructor_p=*/false,
3337 DEFAULT_INIT_PRIORITY
, &locus
);
3340 /* We're done with the splay-tree now. */
3341 if (priority_info_map
)
3342 splay_tree_delete (priority_info_map
);
3344 /* Generate any missing aliases. */
3345 maybe_apply_pending_pragma_weaks ();
3347 /* We're done with static constructors, so we can go back to "C++"
3349 pop_lang_context ();
3351 cgraph_finalize_compilation_unit ();
3354 /* Now, issue warnings about static, but not defined, functions,
3355 etc., and emit debugging information. */
3356 walk_namespaces (wrapup_globals_for_namespace
, /*data=*/&reconsider
);
3357 if (VEC_length (tree
, pending_statics
) != 0)
3359 check_global_declarations (VEC_address (tree
, pending_statics
),
3360 VEC_length (tree
, pending_statics
));
3361 emit_debug_global_declarations (VEC_address (tree
, pending_statics
),
3362 VEC_length (tree
, pending_statics
));
3365 /* Generate hidden aliases for Java. */
3366 build_java_method_aliases ();
3370 /* The entire file is now complete. If requested, dump everything
3374 FILE *stream
= dump_begin (TDI_tu
, &flags
);
3378 dump_node (global_namespace
, flags
& ~TDF_SLIM
, stream
);
3379 dump_end (TDI_tu
, stream
);
3383 timevar_pop (TV_VARCONST
);
3385 if (flag_detailed_statistics
)
3387 dump_tree_statistics ();
3388 dump_time_statistics ();
3390 input_location
= locus
;
3392 #ifdef ENABLE_CHECKING
3393 validate_conversion_obstack ();
3394 #endif /* ENABLE_CHECKING */
3397 /* FN is an OFFSET_REF, DOTSTAR_EXPR or MEMBER_REF indicating the
3398 function to call in parse-tree form; it has not yet been
3399 semantically analyzed. ARGS are the arguments to the function.
3400 They have already been semantically analyzed. */
3403 build_offset_ref_call_from_tree (tree fn
, tree args
)
3412 object
= TREE_OPERAND (fn
, 0);
3414 if (processing_template_decl
)
3416 gcc_assert (TREE_CODE (fn
) == DOTSTAR_EXPR
3417 || TREE_CODE (fn
) == MEMBER_REF
);
3418 if (type_dependent_expression_p (fn
)
3419 || any_type_dependent_arguments_p (args
))
3420 return build_min_nt (CALL_EXPR
, fn
, args
, NULL_TREE
);
3422 /* Transform the arguments and add the implicit "this"
3423 parameter. That must be done before the FN is transformed
3424 because we depend on the form of FN. */
3425 args
= build_non_dependent_args (args
);
3426 if (TREE_CODE (fn
) == DOTSTAR_EXPR
)
3427 object
= build_unary_op (ADDR_EXPR
, object
, 0);
3428 object
= build_non_dependent_expr (object
);
3429 args
= tree_cons (NULL_TREE
, object
, args
);
3430 /* Now that the arguments are done, transform FN. */
3431 fn
= build_non_dependent_expr (fn
);
3434 /* A qualified name corresponding to a bound pointer-to-member is
3435 represented as an OFFSET_REF:
3437 struct B { void g(); };
3439 void B::g() { (this->*p)(); } */
3440 if (TREE_CODE (fn
) == OFFSET_REF
)
3442 tree object_addr
= build_unary_op (ADDR_EXPR
, object
, 0);
3443 fn
= TREE_OPERAND (fn
, 1);
3444 fn
= get_member_function_from_ptrfunc (&object_addr
, fn
);
3445 args
= tree_cons (NULL_TREE
, object_addr
, args
);
3448 expr
= build_function_call (fn
, args
);
3449 if (processing_template_decl
&& expr
!= error_mark_node
)
3450 return build_min_non_dep (CALL_EXPR
, expr
, orig_fn
, orig_args
, NULL_TREE
);
3456 check_default_args (tree x
)
3458 tree arg
= TYPE_ARG_TYPES (TREE_TYPE (x
));
3459 bool saw_def
= false;
3460 int i
= 0 - (TREE_CODE (TREE_TYPE (x
)) == METHOD_TYPE
);
3461 for (; arg
&& arg
!= void_list_node
; arg
= TREE_CHAIN (arg
), ++i
)
3463 if (TREE_PURPOSE (arg
))
3467 error ("default argument missing for parameter %P of %q+#D", i
, x
);
3468 TREE_PURPOSE (arg
) = error_mark_node
;
3473 /* Mark DECL (either a _DECL or a BASELINK) as "used" in the program.
3474 If DECL is a specialization or implicitly declared class member,
3475 generate the actual definition. */
3478 mark_used (tree decl
)
3480 HOST_WIDE_INT saved_processing_template_decl
= 0;
3482 /* If DECL is a BASELINK for a single function, then treat it just
3483 like the DECL for the function. Otherwise, if the BASELINK is
3484 for an overloaded function, we don't know which function was
3485 actually used until after overload resolution. */
3486 if (TREE_CODE (decl
) == BASELINK
)
3488 decl
= BASELINK_FUNCTIONS (decl
);
3489 if (really_overloaded_fn (decl
))
3491 decl
= OVL_CURRENT (decl
);
3494 TREE_USED (decl
) = 1;
3495 if (DECL_CLONED_FUNCTION_P (decl
))
3496 TREE_USED (DECL_CLONED_FUNCTION (decl
)) = 1;
3497 /* If we don't need a value, then we don't need to synthesize DECL. */
3498 if (skip_evaluation
)
3500 /* Normally, we can wait until instantiation-time to synthesize
3501 DECL. However, if DECL is a static data member initialized with
3502 a constant, we need the value right now because a reference to
3503 such a data member is not value-dependent. */
3504 if (TREE_CODE (decl
) == VAR_DECL
3505 && DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl
)
3506 && DECL_CLASS_SCOPE_P (decl
))
3508 /* Don't try to instantiate members of dependent types. We
3509 cannot just use dependent_type_p here because this function
3510 may be called from fold_non_dependent_expr, and then we may
3511 see dependent types, even though processing_template_decl
3513 if (CLASSTYPE_TEMPLATE_INFO ((DECL_CONTEXT (decl
)))
3514 && uses_template_parms (CLASSTYPE_TI_ARGS (DECL_CONTEXT (decl
))))
3516 /* Pretend that we are not in a template, even if we are, so
3517 that the static data member initializer will be processed. */
3518 saved_processing_template_decl
= processing_template_decl
;
3519 processing_template_decl
= 0;
3522 if (processing_template_decl
)
3525 if (TREE_CODE (decl
) == FUNCTION_DECL
&& DECL_DECLARED_INLINE_P (decl
)
3526 && !TREE_ASM_WRITTEN (decl
))
3527 /* Remember it, so we can check it was defined. */
3529 if (DECL_DEFERRED_FN (decl
))
3532 /* Remember the current location for a function we will end up
3533 synthesizing. Then we can inform the user where it was
3534 required in the case of error. */
3535 if (DECL_ARTIFICIAL (decl
) && DECL_NONSTATIC_MEMBER_FUNCTION_P (decl
)
3536 && !DECL_THUNK_P (decl
))
3537 DECL_SOURCE_LOCATION (decl
) = input_location
;
3539 note_vague_linkage_fn (decl
);
3542 assemble_external (decl
);
3544 /* Is it a synthesized method that needs to be synthesized? */
3545 if (TREE_CODE (decl
) == FUNCTION_DECL
3546 && DECL_NONSTATIC_MEMBER_FUNCTION_P (decl
)
3547 && DECL_ARTIFICIAL (decl
)
3548 && !DECL_THUNK_P (decl
)
3549 && ! DECL_INITIAL (decl
)
3550 /* Kludge: don't synthesize for default args. Unfortunately this
3551 rules out initializers of namespace-scoped objects too, but
3552 it's sort-of ok if the implicit ctor or dtor decl keeps
3553 pointing to the class location. */
3554 && current_function_decl
)
3556 synthesize_method (decl
);
3557 /* If we've already synthesized the method we don't need to
3558 do the instantiation test below. */
3560 else if ((DECL_NON_THUNK_FUNCTION_P (decl
) || TREE_CODE (decl
) == VAR_DECL
)
3561 && DECL_LANG_SPECIFIC (decl
) && DECL_TEMPLATE_INFO (decl
)
3562 && (!DECL_EXPLICIT_INSTANTIATION (decl
)
3563 || (TREE_CODE (decl
) == FUNCTION_DECL
3564 && DECL_INLINE (DECL_TEMPLATE_RESULT
3565 (template_for_substitution (decl
))))
3566 /* We need to instantiate static data members so that there
3567 initializers are available in integral constant
3569 || (TREE_CODE (decl
) == VAR_DECL
3570 && DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl
))))
3571 /* If this is a function or variable that is an instance of some
3572 template, we now know that we will need to actually do the
3573 instantiation. We check that DECL is not an explicit
3574 instantiation because that is not checked in instantiate_decl.
3576 We put off instantiating functions in order to improve compile
3577 times. Maintaining a stack of active functions is expensive,
3578 and the inliner knows to instantiate any functions it might
3579 need. Therefore, we always try to defer instantiation. */
3580 instantiate_decl (decl
, /*defer_ok=*/true,
3581 /*expl_inst_class_mem_p=*/false);
3583 processing_template_decl
= saved_processing_template_decl
;
3586 #include "gt-cp-decl2.h"