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. */
102 /* Return a member function type (a METHOD_TYPE), given FNTYPE (a
103 FUNCTION_TYPE), CTYPE (class type), and QUALS (the cv-qualifiers
104 that apply to the function). */
107 build_memfn_type (tree fntype
, tree ctype
, cp_cv_quals quals
)
112 if (fntype
== error_mark_node
|| ctype
== error_mark_node
)
113 return error_mark_node
;
115 type_quals
= quals
& ~TYPE_QUAL_RESTRICT
;
116 ctype
= cp_build_qualified_type (ctype
, type_quals
);
117 fntype
= build_method_type_directly (ctype
, TREE_TYPE (fntype
),
118 (TREE_CODE (fntype
) == METHOD_TYPE
119 ? TREE_CHAIN (TYPE_ARG_TYPES (fntype
))
120 : TYPE_ARG_TYPES (fntype
)));
121 raises
= TYPE_RAISES_EXCEPTIONS (fntype
);
123 fntype
= build_exception_variant (fntype
, raises
);
128 /* Build a PARM_DECL with NAME and TYPE, and set DECL_ARG_TYPE
132 cp_build_parm_decl (tree name
, tree type
)
134 tree parm
= build_decl (PARM_DECL
, name
, type
);
135 /* DECL_ARG_TYPE is only used by the back end and the back end never
137 if (!processing_template_decl
)
138 DECL_ARG_TYPE (parm
) = type_passed_as (type
);
142 /* Returns a PARM_DECL for a parameter of the indicated TYPE, with the
146 build_artificial_parm (tree name
, tree type
)
148 tree parm
= cp_build_parm_decl (name
, type
);
149 DECL_ARTIFICIAL (parm
) = 1;
150 /* All our artificial parms are implicitly `const'; they cannot be
152 TREE_READONLY (parm
) = 1;
156 /* Constructors for types with virtual baseclasses need an "in-charge" flag
157 saying whether this constructor is responsible for initialization of
158 virtual baseclasses or not. All destructors also need this "in-charge"
159 flag, which additionally determines whether or not the destructor should
160 free the memory for the object.
162 This function adds the "in-charge" flag to member function FN if
163 appropriate. It is called from grokclassfn and tsubst.
164 FN must be either a constructor or destructor.
166 The in-charge flag follows the 'this' parameter, and is followed by the
167 VTT parm (if any), then the user-written parms. */
170 maybe_retrofit_in_chrg (tree fn
)
172 tree basetype
, arg_types
, parms
, parm
, fntype
;
174 /* If we've already add the in-charge parameter don't do it again. */
175 if (DECL_HAS_IN_CHARGE_PARM_P (fn
))
178 /* When processing templates we can't know, in general, whether or
179 not we're going to have virtual baseclasses. */
180 if (processing_template_decl
)
183 /* We don't need an in-charge parameter for constructors that don't
184 have virtual bases. */
185 if (DECL_CONSTRUCTOR_P (fn
)
186 && !CLASSTYPE_VBASECLASSES (DECL_CONTEXT (fn
)))
189 arg_types
= TYPE_ARG_TYPES (TREE_TYPE (fn
));
190 basetype
= TREE_TYPE (TREE_VALUE (arg_types
));
191 arg_types
= TREE_CHAIN (arg_types
);
193 parms
= TREE_CHAIN (DECL_ARGUMENTS (fn
));
195 /* If this is a subobject constructor or destructor, our caller will
196 pass us a pointer to our VTT. */
197 if (CLASSTYPE_VBASECLASSES (DECL_CONTEXT (fn
)))
199 parm
= build_artificial_parm (vtt_parm_identifier
, vtt_parm_type
);
201 /* First add it to DECL_ARGUMENTS between 'this' and the real args... */
202 TREE_CHAIN (parm
) = parms
;
205 /* ...and then to TYPE_ARG_TYPES. */
206 arg_types
= hash_tree_chain (vtt_parm_type
, arg_types
);
208 DECL_HAS_VTT_PARM_P (fn
) = 1;
211 /* Then add the in-charge parm (before the VTT parm). */
212 parm
= build_artificial_parm (in_charge_identifier
, integer_type_node
);
213 TREE_CHAIN (parm
) = parms
;
215 arg_types
= hash_tree_chain (integer_type_node
, arg_types
);
217 /* Insert our new parameter(s) into the list. */
218 TREE_CHAIN (DECL_ARGUMENTS (fn
)) = parms
;
220 /* And rebuild the function type. */
221 fntype
= build_method_type_directly (basetype
, TREE_TYPE (TREE_TYPE (fn
)),
223 if (TYPE_RAISES_EXCEPTIONS (TREE_TYPE (fn
)))
224 fntype
= build_exception_variant (fntype
,
225 TYPE_RAISES_EXCEPTIONS (TREE_TYPE (fn
)));
226 TREE_TYPE (fn
) = fntype
;
228 /* Now we've got the in-charge parameter. */
229 DECL_HAS_IN_CHARGE_PARM_P (fn
) = 1;
232 /* Classes overload their constituent function names automatically.
233 When a function name is declared in a record structure,
234 its name is changed to it overloaded name. Since names for
235 constructors and destructors can conflict, we place a leading
238 CNAME is the name of the class we are grokking for.
240 FUNCTION is a FUNCTION_DECL. It was created by `grokdeclarator'.
242 FLAGS contains bits saying what's special about today's
243 arguments. 1 == DESTRUCTOR. 2 == OPERATOR.
245 If FUNCTION is a destructor, then we must add the `auto-delete' field
246 as a second parameter. There is some hair associated with the fact
247 that we must "declare" this variable in the manner consistent with the
248 way the rest of the arguments were declared.
250 QUALS are the qualifiers for the this pointer. */
253 grokclassfn (tree ctype
, tree function
, enum overload_flags flags
)
255 tree fn_name
= DECL_NAME (function
);
257 /* Even within an `extern "C"' block, members get C++ linkage. See
258 [dcl.link] for details. */
259 SET_DECL_LANGUAGE (function
, lang_cplusplus
);
261 if (fn_name
== NULL_TREE
)
263 error ("name missing for member function");
264 fn_name
= get_identifier ("<anonymous>");
265 DECL_NAME (function
) = fn_name
;
268 DECL_CONTEXT (function
) = ctype
;
270 if (flags
== DTOR_FLAG
)
271 DECL_DESTRUCTOR_P (function
) = 1;
273 if (flags
== DTOR_FLAG
|| DECL_CONSTRUCTOR_P (function
))
274 maybe_retrofit_in_chrg (function
);
277 /* Create an ARRAY_REF, checking for the user doing things backwards
281 grok_array_decl (tree array_expr
, tree index_exp
)
285 tree orig_array_expr
= array_expr
;
286 tree orig_index_exp
= index_exp
;
288 if (error_operand_p (array_expr
) || error_operand_p (index_exp
))
289 return error_mark_node
;
291 if (processing_template_decl
)
293 if (type_dependent_expression_p (array_expr
)
294 || type_dependent_expression_p (index_exp
))
295 return build_min_nt (ARRAY_REF
, array_expr
, index_exp
,
296 NULL_TREE
, NULL_TREE
);
297 array_expr
= build_non_dependent_expr (array_expr
);
298 index_exp
= build_non_dependent_expr (index_exp
);
301 type
= TREE_TYPE (array_expr
);
303 type
= non_reference (type
);
305 /* If they have an `operator[]', use that. */
306 if (IS_AGGR_TYPE (type
) || IS_AGGR_TYPE (TREE_TYPE (index_exp
)))
307 expr
= build_new_op (ARRAY_REF
, LOOKUP_NORMAL
,
308 array_expr
, index_exp
, NULL_TREE
,
309 /*overloaded_p=*/NULL
);
314 /* Otherwise, create an ARRAY_REF for a pointer or array type.
315 It is a little-known fact that, if `a' is an array and `i' is
316 an int, you can write `i[a]', which means the same thing as
318 if (TREE_CODE (type
) == ARRAY_TYPE
)
321 p1
= build_expr_type_conversion (WANT_POINTER
, array_expr
, false);
323 if (TREE_CODE (TREE_TYPE (index_exp
)) == ARRAY_TYPE
)
326 p2
= build_expr_type_conversion (WANT_POINTER
, index_exp
, false);
328 i1
= build_expr_type_conversion (WANT_INT
| WANT_ENUM
, array_expr
,
330 i2
= build_expr_type_conversion (WANT_INT
| WANT_ENUM
, index_exp
,
333 if ((p1
&& i2
) && (i1
&& p2
))
334 error ("ambiguous conversion for array subscript");
337 array_expr
= p1
, index_exp
= i2
;
339 array_expr
= p2
, index_exp
= i1
;
342 error ("invalid types %<%T[%T]%> for array subscript",
343 type
, TREE_TYPE (index_exp
));
344 return error_mark_node
;
347 if (array_expr
== error_mark_node
|| index_exp
== error_mark_node
)
348 error ("ambiguous conversion for array subscript");
350 expr
= build_array_ref (array_expr
, index_exp
);
352 if (processing_template_decl
&& expr
!= error_mark_node
)
353 return build_min_non_dep (ARRAY_REF
, expr
, orig_array_expr
, orig_index_exp
,
354 NULL_TREE
, NULL_TREE
);
358 /* Given the cast expression EXP, checking out its validity. Either return
359 an error_mark_node if there was an unavoidable error, return a cast to
360 void for trying to delete a pointer w/ the value 0, or return the
361 call to delete. If DOING_VEC is true, we handle things differently
362 for doing an array delete.
363 Implements ARM $5.3.4. This is called from the parser. */
366 delete_sanity (tree exp
, tree size
, bool doing_vec
, int use_global_delete
)
370 if (exp
== error_mark_node
)
373 if (processing_template_decl
)
375 t
= build_min (DELETE_EXPR
, void_type_node
, exp
, size
);
376 DELETE_EXPR_USE_GLOBAL (t
) = use_global_delete
;
377 DELETE_EXPR_USE_VEC (t
) = doing_vec
;
378 TREE_SIDE_EFFECTS (t
) = 1;
382 /* An array can't have been allocated by new, so complain. */
383 if (TREE_CODE (exp
) == VAR_DECL
384 && TREE_CODE (TREE_TYPE (exp
)) == ARRAY_TYPE
)
385 warning (0, "deleting array %q#D", exp
);
387 t
= build_expr_type_conversion (WANT_POINTER
, exp
, true);
389 if (t
== NULL_TREE
|| t
== error_mark_node
)
391 error ("type %q#T argument given to %<delete%>, expected pointer",
393 return error_mark_node
;
396 type
= TREE_TYPE (t
);
398 /* As of Valley Forge, you can delete a pointer to const. */
400 /* You can't delete functions. */
401 if (TREE_CODE (TREE_TYPE (type
)) == FUNCTION_TYPE
)
403 error ("cannot delete a function. Only pointer-to-objects are "
404 "valid arguments to %<delete%>");
405 return error_mark_node
;
408 /* Deleting ptr to void is undefined behavior [expr.delete/3]. */
409 if (TREE_CODE (TREE_TYPE (type
)) == VOID_TYPE
)
411 warning (0, "deleting %qT is undefined", type
);
415 /* Deleting a pointer with the value zero is valid and has no effect. */
416 if (integer_zerop (t
))
417 return build1 (NOP_EXPR
, void_type_node
, t
);
420 return build_vec_delete (t
, /*maxindex=*/NULL_TREE
,
421 sfk_deleting_destructor
,
424 return build_delete (type
, t
, sfk_deleting_destructor
,
425 LOOKUP_NORMAL
, use_global_delete
);
428 /* Report an error if the indicated template declaration is not the
429 sort of thing that should be a member template. */
432 check_member_template (tree tmpl
)
436 gcc_assert (TREE_CODE (tmpl
) == TEMPLATE_DECL
);
437 decl
= DECL_TEMPLATE_RESULT (tmpl
);
439 if (TREE_CODE (decl
) == FUNCTION_DECL
440 || (TREE_CODE (decl
) == TYPE_DECL
441 && IS_AGGR_TYPE (TREE_TYPE (decl
))))
443 /* The parser rejects template declarations in local classes. */
444 gcc_assert (!current_function_decl
);
445 /* The parser rejects any use of virtual in a function template. */
446 gcc_assert (!(TREE_CODE (decl
) == FUNCTION_DECL
447 && DECL_VIRTUAL_P (decl
)));
449 /* The debug-information generating code doesn't know what to do
450 with member templates. */
451 DECL_IGNORED_P (tmpl
) = 1;
454 error ("template declaration of %q#D", decl
);
457 /* Return true iff TYPE is a valid Java parameter or return type. */
460 acceptable_java_type (tree type
)
462 if (type
== error_mark_node
)
465 if (TREE_CODE (type
) == VOID_TYPE
|| TYPE_FOR_JAVA (type
))
467 if (TREE_CODE (type
) == POINTER_TYPE
|| TREE_CODE (type
) == REFERENCE_TYPE
)
469 type
= TREE_TYPE (type
);
470 if (TREE_CODE (type
) == RECORD_TYPE
)
473 if (! TYPE_FOR_JAVA (type
))
475 if (! CLASSTYPE_TEMPLATE_INFO (type
))
477 args
= CLASSTYPE_TI_ARGS (type
);
478 i
= TREE_VEC_LENGTH (args
);
481 type
= TREE_VEC_ELT (args
, i
);
482 if (TREE_CODE (type
) == POINTER_TYPE
)
483 type
= TREE_TYPE (type
);
484 if (! TYPE_FOR_JAVA (type
))
493 /* For a METHOD in a Java class CTYPE, return true if
494 the parameter and return types are valid Java types.
495 Otherwise, print appropriate error messages, and return false. */
498 check_java_method (tree method
)
501 tree arg_types
= TYPE_ARG_TYPES (TREE_TYPE (method
));
502 tree ret_type
= TREE_TYPE (TREE_TYPE (method
));
504 if (!acceptable_java_type (ret_type
))
506 error ("Java method %qD has non-Java return type %qT",
511 arg_types
= TREE_CHAIN (arg_types
);
512 if (DECL_HAS_IN_CHARGE_PARM_P (method
))
513 arg_types
= TREE_CHAIN (arg_types
);
514 if (DECL_HAS_VTT_PARM_P (method
))
515 arg_types
= TREE_CHAIN (arg_types
);
517 for (; arg_types
!= NULL_TREE
; arg_types
= TREE_CHAIN (arg_types
))
519 tree type
= TREE_VALUE (arg_types
);
520 if (!acceptable_java_type (type
))
522 if (type
!= error_mark_node
)
523 error ("Java method %qD has non-Java parameter type %qT",
531 /* Sanity check: report error if this function FUNCTION is not
532 really a member of the class (CTYPE) it is supposed to belong to.
533 TEMPLATE_PARMS is used to specify the template parameters of a member
534 template passed as FUNCTION_DECL. If the member template is passed as a
535 TEMPLATE_DECL, it can be NULL since the parameters can be extracted
536 from the declaration. If the function is not a function template, it
538 It returns the original declaration for the function, or NULL_TREE
539 if no declaration was found (and an error was emitted). */
542 check_classfn (tree ctype
, tree function
, tree template_parms
)
548 if (DECL_USE_TEMPLATE (function
)
549 && !(TREE_CODE (function
) == TEMPLATE_DECL
550 && DECL_TEMPLATE_SPECIALIZATION (function
))
551 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (function
)))
552 /* Since this is a specialization of a member template,
553 we're not going to find the declaration in the class.
556 struct S { template <typename T> void f(T); };
557 template <> void S::f(int);
559 we're not going to find `S::f(int)', but there's no
560 reason we should, either. We let our callers know we didn't
561 find the method, but we don't complain. */
564 /* Basic sanity check: for a template function, the template parameters
565 either were not passed, or they are the same of DECL_TEMPLATE_PARMS. */
566 if (TREE_CODE (function
) == TEMPLATE_DECL
)
568 gcc_assert (!template_parms
569 || comp_template_parms (template_parms
,
570 DECL_TEMPLATE_PARMS (function
)));
571 template_parms
= DECL_TEMPLATE_PARMS (function
);
574 /* OK, is this a definition of a member template? */
575 is_template
= (template_parms
!= NULL_TREE
);
577 /* We must enter the scope here, because conversion operators are
578 named by target type, and type equivalence relies on typenames
579 resolving within the scope of CTYPE. */
580 pushed_scope
= push_scope (ctype
);
581 ix
= class_method_index_for_fn (complete_type (ctype
), function
);
584 VEC(tree
,gc
) *methods
= CLASSTYPE_METHOD_VEC (ctype
);
585 tree fndecls
, fndecl
= 0;
587 const char *format
= NULL
;
589 for (fndecls
= VEC_index (tree
, methods
, ix
);
590 fndecls
; fndecls
= OVL_NEXT (fndecls
))
594 fndecl
= OVL_CURRENT (fndecls
);
595 p1
= TYPE_ARG_TYPES (TREE_TYPE (function
));
596 p2
= TYPE_ARG_TYPES (TREE_TYPE (fndecl
));
598 /* We cannot simply call decls_match because this doesn't
599 work for static member functions that are pretending to
600 be methods, and because the name may have been changed by
603 /* Get rid of the this parameter on functions that become
605 if (DECL_STATIC_FUNCTION_P (fndecl
)
606 && TREE_CODE (TREE_TYPE (function
)) == METHOD_TYPE
)
607 p1
= TREE_CHAIN (p1
);
609 /* A member template definition only matches a member template
611 if (is_template
!= (TREE_CODE (fndecl
) == TEMPLATE_DECL
))
614 if (same_type_p (TREE_TYPE (TREE_TYPE (function
)),
615 TREE_TYPE (TREE_TYPE (fndecl
)))
616 && compparms (p1
, p2
)
618 || comp_template_parms (template_parms
,
619 DECL_TEMPLATE_PARMS (fndecl
)))
620 && (DECL_TEMPLATE_SPECIALIZATION (function
)
621 == DECL_TEMPLATE_SPECIALIZATION (fndecl
))
622 && (!DECL_TEMPLATE_SPECIALIZATION (function
)
623 || (DECL_TI_TEMPLATE (function
)
624 == DECL_TI_TEMPLATE (fndecl
))))
630 pop_scope (pushed_scope
);
631 return OVL_CURRENT (fndecls
);
634 error ("prototype for %q#D does not match any in class %qT",
636 is_conv_op
= DECL_CONV_FN_P (fndecl
);
639 ix
= CLASSTYPE_FIRST_CONVERSION_SLOT
;
640 fndecls
= VEC_index (tree
, methods
, ix
);
643 fndecl
= OVL_CURRENT (fndecls
);
644 fndecls
= OVL_NEXT (fndecls
);
646 if (!fndecls
&& is_conv_op
)
648 if (VEC_length (tree
, methods
) > (size_t) ++ix
)
650 fndecls
= VEC_index (tree
, methods
, ix
);
651 if (!DECL_CONV_FN_P (OVL_CURRENT (fndecls
)))
663 format
= N_("candidates are: %+#D");
665 format
= N_("candidate is: %+#D");
666 error (format
, fndecl
);
669 else if (!COMPLETE_TYPE_P (ctype
))
670 cxx_incomplete_type_error (function
, ctype
);
672 error ("no %q#D member function declared in class %qT",
675 /* If we did not find the method in the class, add it to avoid
676 spurious errors (unless the CTYPE is not yet defined, in which
677 case we'll only confuse ourselves when the function is declared
678 properly within the class. */
679 if (COMPLETE_TYPE_P (ctype
))
680 add_method (ctype
, function
, NULL_TREE
);
683 pop_scope (pushed_scope
);
687 /* DECL is a function with vague linkage. Remember it so that at the
688 end of the translation unit we can decide whether or not to emit
692 note_vague_linkage_fn (tree decl
)
694 if (!DECL_DEFERRED_FN (decl
))
696 DECL_DEFERRED_FN (decl
) = 1;
697 DECL_DEFER_OUTPUT (decl
) = 1;
698 VEC_safe_push (tree
, gc
, deferred_fns
, decl
);
702 /* We have just processed the DECL, which is a static data member.
703 The other parameters are as for cp_finish_decl. */
706 finish_static_data_member_decl (tree decl
,
707 tree init
, bool init_const_expr_p
,
711 DECL_CONTEXT (decl
) = current_class_type
;
713 /* We cannot call pushdecl here, because that would fill in the
714 TREE_CHAIN of our decl. Instead, we modify cp_finish_decl to do
715 the right thing, namely, to put this decl out straight away. */
717 if (! processing_template_decl
)
718 VEC_safe_push (tree
, gc
, pending_statics
, decl
);
720 if (LOCAL_CLASS_P (current_class_type
))
721 pedwarn ("local class %q#T shall not have static data member %q#D",
722 current_class_type
, decl
);
724 /* Static consts need not be initialized in the class definition. */
725 if (init
!= NULL_TREE
&& TYPE_NEEDS_CONSTRUCTING (TREE_TYPE (decl
)))
727 static int explained
= 0;
729 error ("initializer invalid for static member with constructor");
732 error ("(an out of class initialization is required)");
737 /* Force the compiler to know when an uninitialized static const
738 member is being used. */
739 if (CP_TYPE_CONST_P (TREE_TYPE (decl
)) && init
== 0)
740 TREE_USED (decl
) = 1;
741 DECL_INITIAL (decl
) = init
;
742 DECL_IN_AGGR_P (decl
) = 1;
744 cp_finish_decl (decl
, init
, init_const_expr_p
, asmspec_tree
, flags
);
747 /* DECLARATOR and DECLSPECS correspond to a class member. The other
748 parameters are as for cp_finish_decl. Return the DECL for the
749 class member declared. */
752 grokfield (const cp_declarator
*declarator
,
753 cp_decl_specifier_seq
*declspecs
,
754 tree init
, bool init_const_expr_p
,
759 const char *asmspec
= 0;
760 int flags
= LOOKUP_ONLYCONVERTING
;
763 && TREE_CODE (init
) == TREE_LIST
764 && TREE_VALUE (init
) == error_mark_node
765 && TREE_CHAIN (init
) == NULL_TREE
)
768 value
= grokdeclarator (declarator
, declspecs
, FIELD
, init
!= 0, &attrlist
);
769 if (! value
|| error_operand_p (value
))
770 /* friend or constructor went bad. */
771 return error_mark_node
;
773 if (TREE_CODE (value
) == TYPE_DECL
&& init
)
775 error ("typedef %qD is initialized (use __typeof__ instead)", value
);
779 /* Pass friendly classes back. */
780 if (value
== void_type_node
)
783 /* Pass friend decls back. */
784 if ((TREE_CODE (value
) == FUNCTION_DECL
785 || TREE_CODE (value
) == TEMPLATE_DECL
)
786 && DECL_CONTEXT (value
) != current_class_type
)
789 if (DECL_NAME (value
) != NULL_TREE
790 && IDENTIFIER_POINTER (DECL_NAME (value
))[0] == '_'
791 && ! strcmp (IDENTIFIER_POINTER (DECL_NAME (value
)), "_vptr"))
792 error ("member %qD conflicts with virtual function table field name",
795 /* Stash away type declarations. */
796 if (TREE_CODE (value
) == TYPE_DECL
)
798 DECL_NONLOCAL (value
) = 1;
799 DECL_CONTEXT (value
) = current_class_type
;
801 if (processing_template_decl
)
802 value
= push_template_decl (value
);
806 /* Avoid storing attributes in template parameters:
807 tsubst is not ready to handle them. */
808 tree type
= TREE_TYPE (value
);
809 if (TREE_CODE (type
) == TEMPLATE_TYPE_PARM
810 || TREE_CODE (type
) == BOUND_TEMPLATE_TEMPLATE_PARM
)
811 sorry ("applying attributes to template parameters is not implemented");
813 cplus_decl_attributes (&value
, attrlist
, 0);
819 if (DECL_IN_AGGR_P (value
))
821 error ("%qD is already defined in %qT", value
, DECL_CONTEXT (value
));
822 return void_type_node
;
825 if (asmspec_tree
&& asmspec_tree
!= error_mark_node
)
826 asmspec
= TREE_STRING_POINTER (asmspec_tree
);
830 if (TREE_CODE (value
) == FUNCTION_DECL
)
832 /* Initializers for functions are rejected early in the parser.
833 If we get here, it must be a pure specifier for a method. */
834 if (TREE_CODE (TREE_TYPE (value
)) == METHOD_TYPE
)
836 gcc_assert (error_operand_p (init
) || integer_zerop (init
));
837 DECL_PURE_VIRTUAL_P (value
) = 1;
841 gcc_assert (TREE_CODE (TREE_TYPE (value
)) == FUNCTION_TYPE
);
842 error ("initializer specified for static member function %qD",
846 else if (pedantic
&& TREE_CODE (value
) != VAR_DECL
)
847 /* Already complained in grokdeclarator. */
849 else if (!processing_template_decl
)
851 if (TREE_CODE (init
) == CONSTRUCTOR
)
852 init
= digest_init (TREE_TYPE (value
), init
);
854 init
= integral_constant_value (init
);
856 if (init
!= error_mark_node
&& !TREE_CONSTANT (init
))
858 /* We can allow references to things that are effectively
859 static, since references are initialized with the
861 if (TREE_CODE (TREE_TYPE (value
)) != REFERENCE_TYPE
862 || (TREE_STATIC (init
) == 0
863 && (!DECL_P (init
) || DECL_EXTERNAL (init
) == 0)))
865 error ("field initializer is not constant");
866 init
= error_mark_node
;
872 if (processing_template_decl
873 && (TREE_CODE (value
) == VAR_DECL
|| TREE_CODE (value
) == FUNCTION_DECL
))
875 value
= push_template_decl (value
);
876 if (error_operand_p (value
))
877 return error_mark_node
;
881 cplus_decl_attributes (&value
, attrlist
, 0);
883 switch (TREE_CODE (value
))
886 finish_static_data_member_decl (value
, init
, init_const_expr_p
,
887 asmspec_tree
, flags
);
892 error ("%<asm%> specifiers are not permitted on non-static data members");
893 if (DECL_INITIAL (value
) == error_mark_node
)
894 init
= error_mark_node
;
895 cp_finish_decl (value
, init
, /*init_const_expr_p=*/false,
897 DECL_INITIAL (value
) = init
;
898 DECL_IN_AGGR_P (value
) = 1;
903 set_user_assembler_name (value
, asmspec
);
905 cp_finish_decl (value
,
907 /*init_const_expr_p=*/false,
908 asmspec_tree
, flags
);
910 /* Pass friends back this way. */
911 if (DECL_FRIEND_P (value
))
912 return void_type_node
;
914 DECL_IN_AGGR_P (value
) = 1;
923 /* Like `grokfield', but for bitfields.
924 WIDTH is non-NULL for bit fields only, and is an INTEGER_CST node. */
927 grokbitfield (const cp_declarator
*declarator
,
928 cp_decl_specifier_seq
*declspecs
, tree width
)
930 tree value
= grokdeclarator (declarator
, declspecs
, BITFIELD
, 0, NULL
);
932 if (value
== error_mark_node
)
933 return NULL_TREE
; /* friends went bad. */
935 /* Pass friendly classes back. */
936 if (TREE_CODE (value
) == VOID_TYPE
)
937 return void_type_node
;
939 if (!INTEGRAL_TYPE_P (TREE_TYPE (value
))
940 && (POINTER_TYPE_P (value
)
941 || !dependent_type_p (TREE_TYPE (value
))))
943 error ("bit-field %qD with non-integral type", value
);
944 return error_mark_node
;
947 if (TREE_CODE (value
) == TYPE_DECL
)
949 error ("cannot declare %qD to be a bit-field type", value
);
953 /* Usually, finish_struct_1 catches bitfields with invalid types.
954 But, in the case of bitfields with function type, we confuse
955 ourselves into thinking they are member functions, so we must
957 if (TREE_CODE (value
) == FUNCTION_DECL
)
959 error ("cannot declare bit-field %qD with function type",
964 if (DECL_IN_AGGR_P (value
))
966 error ("%qD is already defined in the class %qT", value
,
967 DECL_CONTEXT (value
));
968 return void_type_node
;
971 if (TREE_STATIC (value
))
973 error ("static member %qD cannot be a bit-field", value
);
976 finish_decl (value
, NULL_TREE
, NULL_TREE
);
978 if (width
!= error_mark_node
)
980 constant_expression_warning (width
);
981 DECL_INITIAL (value
) = width
;
982 SET_DECL_C_BIT_FIELD (value
);
985 DECL_IN_AGGR_P (value
) = 1;
991 cplus_decl_attributes (tree
*decl
, tree attributes
, int flags
)
993 if (*decl
== NULL_TREE
|| *decl
== void_type_node
994 || *decl
== error_mark_node
)
997 if (TREE_CODE (*decl
) == TEMPLATE_DECL
)
998 decl
= &DECL_TEMPLATE_RESULT (*decl
);
1000 decl_attributes (decl
, attributes
, flags
);
1002 if (TREE_CODE (*decl
) == TYPE_DECL
)
1003 SET_IDENTIFIER_TYPE_VALUE (DECL_NAME (*decl
), TREE_TYPE (*decl
));
1006 /* Walks through the namespace- or function-scope anonymous union
1007 OBJECT, with the indicated TYPE, building appropriate VAR_DECLs.
1008 Returns one of the fields for use in the mangled name. */
1011 build_anon_union_vars (tree type
, tree object
)
1013 tree main_decl
= NULL_TREE
;
1016 /* Rather than write the code to handle the non-union case,
1017 just give an error. */
1018 if (TREE_CODE (type
) != UNION_TYPE
)
1019 error ("anonymous struct not inside named type");
1021 for (field
= TYPE_FIELDS (type
);
1023 field
= TREE_CHAIN (field
))
1028 if (DECL_ARTIFICIAL (field
))
1030 if (TREE_CODE (field
) != FIELD_DECL
)
1032 pedwarn ("%q+#D invalid; an anonymous union can only "
1033 "have non-static data members", field
);
1037 if (TREE_PRIVATE (field
))
1038 pedwarn ("private member %q+#D in anonymous union", field
);
1039 else if (TREE_PROTECTED (field
))
1040 pedwarn ("protected member %q+#D in anonymous union", field
);
1042 if (processing_template_decl
)
1043 ref
= build_min_nt (COMPONENT_REF
, object
,
1044 DECL_NAME (field
), NULL_TREE
);
1046 ref
= build_class_member_access_expr (object
, field
, NULL_TREE
,
1049 if (DECL_NAME (field
))
1053 decl
= build_decl (VAR_DECL
, DECL_NAME (field
), TREE_TYPE (field
));
1055 base
= get_base_address (object
);
1056 TREE_PUBLIC (decl
) = TREE_PUBLIC (base
);
1057 TREE_STATIC (decl
) = TREE_STATIC (base
);
1058 DECL_EXTERNAL (decl
) = DECL_EXTERNAL (base
);
1060 SET_DECL_VALUE_EXPR (decl
, ref
);
1061 DECL_HAS_VALUE_EXPR_P (decl
) = 1;
1063 decl
= pushdecl (decl
);
1065 else if (ANON_AGGR_TYPE_P (TREE_TYPE (field
)))
1066 decl
= build_anon_union_vars (TREE_TYPE (field
), ref
);
1070 if (main_decl
== NULL_TREE
)
1077 /* Finish off the processing of a UNION_TYPE structure. If the union is an
1078 anonymous union, then all members must be laid out together. PUBLIC_P
1079 is nonzero if this union is not declared static. */
1082 finish_anon_union (tree anon_union_decl
)
1088 if (anon_union_decl
== error_mark_node
)
1091 type
= TREE_TYPE (anon_union_decl
);
1092 public_p
= TREE_PUBLIC (anon_union_decl
);
1094 /* The VAR_DECL's context is the same as the TYPE's context. */
1095 DECL_CONTEXT (anon_union_decl
) = DECL_CONTEXT (TYPE_NAME (type
));
1097 if (TYPE_FIELDS (type
) == NULL_TREE
)
1102 error ("namespace-scope anonymous aggregates must be static");
1106 main_decl
= build_anon_union_vars (type
, anon_union_decl
);
1107 if (main_decl
== error_mark_node
)
1109 if (main_decl
== NULL_TREE
)
1111 warning (0, "anonymous union with no members");
1115 if (!processing_template_decl
)
1117 /* Use main_decl to set the mangled name. */
1118 DECL_NAME (anon_union_decl
) = DECL_NAME (main_decl
);
1119 mangle_decl (anon_union_decl
);
1120 DECL_NAME (anon_union_decl
) = NULL_TREE
;
1123 pushdecl (anon_union_decl
);
1124 if (building_stmt_tree ()
1125 && at_function_scope_p ())
1126 add_decl_expr (anon_union_decl
);
1127 else if (!processing_template_decl
)
1128 rest_of_decl_compilation (anon_union_decl
,
1129 toplevel_bindings_p (), at_eof
);
1132 /* Auxiliary functions to make type signatures for
1133 `operator new' and `operator delete' correspond to
1134 what compiler will be expecting. */
1137 coerce_new_type (tree type
)
1140 tree args
= TYPE_ARG_TYPES (type
);
1142 gcc_assert (TREE_CODE (type
) == FUNCTION_TYPE
);
1144 if (!same_type_p (TREE_TYPE (type
), ptr_type_node
))
1147 error ("%<operator new%> must return type %qT", ptr_type_node
);
1150 if (!args
|| args
== void_list_node
1151 || !same_type_p (TREE_VALUE (args
), size_type_node
))
1154 if (args
&& args
!= void_list_node
)
1155 args
= TREE_CHAIN (args
);
1156 pedwarn ("%<operator new%> takes type %<size_t%> (%qT) "
1157 "as first parameter", size_type_node
);
1162 args
= tree_cons (NULL_TREE
, size_type_node
, args
);
1165 type
= build_exception_variant
1166 (build_function_type (ptr_type_node
, args
),
1167 TYPE_RAISES_EXCEPTIONS (type
));
1175 coerce_delete_type (tree type
)
1178 tree args
= TYPE_ARG_TYPES (type
);
1180 gcc_assert (TREE_CODE (type
) == FUNCTION_TYPE
);
1182 if (!same_type_p (TREE_TYPE (type
), void_type_node
))
1185 error ("%<operator delete%> must return type %qT", void_type_node
);
1188 if (!args
|| args
== void_list_node
1189 || !same_type_p (TREE_VALUE (args
), ptr_type_node
))
1192 if (args
&& args
!= void_list_node
)
1193 args
= TREE_CHAIN (args
);
1194 error ("%<operator delete%> takes type %qT as first parameter",
1200 args
= tree_cons (NULL_TREE
, ptr_type_node
, args
);
1203 type
= build_exception_variant
1204 (build_function_type (void_type_node
, args
),
1205 TYPE_RAISES_EXCEPTIONS (type
));
1214 mark_vtable_entries (tree decl
)
1217 unsigned HOST_WIDE_INT idx
;
1219 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (DECL_INITIAL (decl
)),
1224 STRIP_NOPS (fnaddr
);
1226 if (TREE_CODE (fnaddr
) != ADDR_EXPR
1227 && TREE_CODE (fnaddr
) != FDESC_EXPR
)
1228 /* This entry is an offset: a virtual base class offset, a
1229 virtual call offset, an RTTI offset, etc. */
1232 fn
= TREE_OPERAND (fnaddr
, 0);
1233 TREE_ADDRESSABLE (fn
) = 1;
1234 /* When we don't have vcall offsets, we output thunks whenever
1235 we output the vtables that contain them. With vcall offsets,
1236 we know all the thunks we'll need when we emit a virtual
1237 function, so we emit the thunks there instead. */
1238 if (DECL_THUNK_P (fn
))
1239 use_thunk (fn
, /*emit_p=*/0);
1244 /* Set DECL up to have the closest approximation of "initialized common"
1245 linkage available. */
1248 comdat_linkage (tree decl
)
1251 make_decl_one_only (decl
);
1252 else if (TREE_CODE (decl
) == FUNCTION_DECL
1253 || (TREE_CODE (decl
) == VAR_DECL
&& DECL_ARTIFICIAL (decl
)))
1254 /* We can just emit function and compiler-generated variables
1255 statically; having multiple copies is (for the most part) only
1258 There are two correctness issues, however: the address of a
1259 template instantiation with external linkage should be the
1260 same, independent of what translation unit asks for the
1261 address, and this will not hold when we emit multiple copies of
1262 the function. However, there's little else we can do.
1264 Also, by default, the typeinfo implementation assumes that
1265 there will be only one copy of the string used as the name for
1266 each type. Therefore, if weak symbols are unavailable, the
1267 run-time library should perform a more conservative check; it
1268 should perform a string comparison, rather than an address
1270 TREE_PUBLIC (decl
) = 0;
1273 /* Static data member template instantiations, however, cannot
1274 have multiple copies. */
1275 if (DECL_INITIAL (decl
) == 0
1276 || DECL_INITIAL (decl
) == error_mark_node
)
1277 DECL_COMMON (decl
) = 1;
1278 else if (EMPTY_CONSTRUCTOR_P (DECL_INITIAL (decl
)))
1280 DECL_COMMON (decl
) = 1;
1281 DECL_INITIAL (decl
) = error_mark_node
;
1283 else if (!DECL_EXPLICIT_INSTANTIATION (decl
))
1285 /* We can't do anything useful; leave vars for explicit
1287 DECL_EXTERNAL (decl
) = 1;
1288 DECL_NOT_REALLY_EXTERN (decl
) = 0;
1292 if (DECL_LANG_SPECIFIC (decl
))
1293 DECL_COMDAT (decl
) = 1;
1296 /* For win32 we also want to put explicit instantiations in
1297 linkonce sections, so that they will be merged with implicit
1298 instantiations; otherwise we get duplicate symbol errors.
1299 For Darwin we do not want explicit instantiations to be
1303 maybe_make_one_only (tree decl
)
1305 /* We used to say that this was not necessary on targets that support weak
1306 symbols, because the implicit instantiations will defer to the explicit
1307 one. However, that's not actually the case in SVR4; a strong definition
1308 after a weak one is an error. Also, not making explicit
1309 instantiations one_only means that we can end up with two copies of
1310 some template instantiations. */
1314 /* We can't set DECL_COMDAT on functions, or cp_finish_file will think
1315 we can get away with not emitting them if they aren't used. We need
1316 to for variables so that cp_finish_decl will update their linkage,
1317 because their DECL_INITIAL may not have been set properly yet. */
1319 if (!TARGET_WEAK_NOT_IN_ARCHIVE_TOC
1320 || (! DECL_EXPLICIT_INSTANTIATION (decl
)
1321 && ! DECL_TEMPLATE_SPECIALIZATION (decl
)))
1323 make_decl_one_only (decl
);
1325 if (TREE_CODE (decl
) == VAR_DECL
)
1327 DECL_COMDAT (decl
) = 1;
1328 /* Mark it needed so we don't forget to emit it. */
1329 mark_decl_referenced (decl
);
1334 /* Determine whether or not we want to specifically import or export CTYPE,
1335 using various heuristics. */
1338 import_export_class (tree ctype
)
1340 /* -1 for imported, 1 for exported. */
1341 int import_export
= 0;
1343 /* It only makes sense to call this function at EOF. The reason is
1344 that this function looks at whether or not the first non-inline
1345 non-abstract virtual member function has been defined in this
1346 translation unit. But, we can't possibly know that until we've
1347 seen the entire translation unit. */
1348 gcc_assert (at_eof
);
1350 if (CLASSTYPE_INTERFACE_KNOWN (ctype
))
1353 /* If MULTIPLE_SYMBOL_SPACES is set and we saw a #pragma interface,
1354 we will have CLASSTYPE_INTERFACE_ONLY set but not
1355 CLASSTYPE_INTERFACE_KNOWN. In that case, we don't want to use this
1356 heuristic because someone will supply a #pragma implementation
1357 elsewhere, and deducing it here would produce a conflict. */
1358 if (CLASSTYPE_INTERFACE_ONLY (ctype
))
1361 if (lookup_attribute ("dllimport", TYPE_ATTRIBUTES (ctype
)))
1363 else if (lookup_attribute ("dllexport", TYPE_ATTRIBUTES (ctype
)))
1365 else if (CLASSTYPE_IMPLICIT_INSTANTIATION (ctype
)
1366 && !flag_implicit_templates
)
1367 /* For a template class, without -fimplicit-templates, check the
1368 repository. If the virtual table is assigned to this
1369 translation unit, then export the class; otherwise, import
1371 import_export
= repo_export_class_p (ctype
) ? 1 : -1;
1372 else if (TYPE_POLYMORPHIC_P (ctype
))
1374 /* The ABI specifies that the virtual table and associated
1375 information are emitted with the key method, if any. */
1376 tree method
= CLASSTYPE_KEY_METHOD (ctype
);
1377 /* If weak symbol support is not available, then we must be
1378 careful not to emit the vtable when the key function is
1379 inline. An inline function can be defined in multiple
1380 translation units. If we were to emit the vtable in each
1381 translation unit containing a definition, we would get
1382 multiple definition errors at link-time. */
1383 if (method
&& (flag_weak
|| ! DECL_DECLARED_INLINE_P (method
)))
1384 import_export
= (DECL_REALLY_EXTERN (method
) ? -1 : 1);
1387 /* When MULTIPLE_SYMBOL_SPACES is set, we cannot count on seeing
1388 a definition anywhere else. */
1389 if (MULTIPLE_SYMBOL_SPACES
&& import_export
== -1)
1392 /* Allow back ends the chance to overrule the decision. */
1393 if (targetm
.cxx
.import_export_class
)
1394 import_export
= targetm
.cxx
.import_export_class (ctype
, import_export
);
1398 SET_CLASSTYPE_INTERFACE_KNOWN (ctype
);
1399 CLASSTYPE_INTERFACE_ONLY (ctype
) = (import_export
< 0);
1403 /* Return true if VAR has already been provided to the back end; in that
1404 case VAR should not be modified further by the front end. */
1406 var_finalized_p (tree var
)
1408 return varpool_node (var
)->finalized
;
1411 /* DECL is a VAR_DECL or FUNCTION_DECL which, for whatever reason,
1412 must be emitted in this translation unit. Mark it as such. */
1415 mark_needed (tree decl
)
1417 /* It's possible that we no longer need to set
1418 TREE_SYMBOL_REFERENCED here directly, but doing so is
1420 TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
)) = 1;
1421 mark_decl_referenced (decl
);
1424 /* DECL is either a FUNCTION_DECL or a VAR_DECL. This function
1425 returns true if a definition of this entity should be provided in
1426 this object file. Callers use this function to determine whether
1427 or not to let the back end know that a definition of DECL is
1428 available in this translation unit. */
1431 decl_needed_p (tree decl
)
1433 gcc_assert (TREE_CODE (decl
) == VAR_DECL
1434 || TREE_CODE (decl
) == FUNCTION_DECL
);
1435 /* This function should only be called at the end of the translation
1436 unit. We cannot be sure of whether or not something will be
1437 COMDAT until that point. */
1438 gcc_assert (at_eof
);
1440 /* All entities with external linkage that are not COMDAT should be
1441 emitted; they may be referred to from other object files. */
1442 if (TREE_PUBLIC (decl
) && !DECL_COMDAT (decl
))
1444 /* If this entity was used, let the back end see it; it will decide
1445 whether or not to emit it into the object file. */
1446 if (TREE_USED (decl
)
1447 || (DECL_ASSEMBLER_NAME_SET_P (decl
)
1448 && TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
))))
1450 /* Otherwise, DECL does not need to be emitted -- yet. A subsequent
1451 reference to DECL might cause it to be emitted later. */
1455 /* If necessary, write out the vtables for the dynamic class CTYPE.
1456 Returns true if any vtables were emitted. */
1459 maybe_emit_vtables (tree ctype
)
1465 /* If the vtables for this class have already been emitted there is
1466 nothing more to do. */
1467 primary_vtbl
= CLASSTYPE_VTABLES (ctype
);
1468 if (var_finalized_p (primary_vtbl
))
1470 /* Ignore dummy vtables made by get_vtable_decl. */
1471 if (TREE_TYPE (primary_vtbl
) == void_type_node
)
1474 /* On some targets, we cannot determine the key method until the end
1475 of the translation unit -- which is when this function is
1477 if (!targetm
.cxx
.key_method_may_be_inline ())
1478 determine_key_method (ctype
);
1480 /* See if any of the vtables are needed. */
1481 for (vtbl
= CLASSTYPE_VTABLES (ctype
); vtbl
; vtbl
= TREE_CHAIN (vtbl
))
1483 import_export_decl (vtbl
);
1484 if (DECL_NOT_REALLY_EXTERN (vtbl
) && decl_needed_p (vtbl
))
1489 /* If the references to this class' vtables are optimized away,
1490 still emit the appropriate debugging information. See
1492 if (DECL_COMDAT (primary_vtbl
)
1493 && CLASSTYPE_DEBUG_REQUESTED (ctype
))
1494 note_debug_info_needed (ctype
);
1498 /* The ABI requires that we emit all of the vtables if we emit any
1500 for (vtbl
= CLASSTYPE_VTABLES (ctype
); vtbl
; vtbl
= TREE_CHAIN (vtbl
))
1502 /* Mark entities references from the virtual table as used. */
1503 mark_vtable_entries (vtbl
);
1505 if (TREE_TYPE (DECL_INITIAL (vtbl
)) == 0)
1507 tree expr
= store_init_value (vtbl
, DECL_INITIAL (vtbl
));
1509 /* It had better be all done at compile-time. */
1514 DECL_EXTERNAL (vtbl
) = 0;
1515 rest_of_decl_compilation (vtbl
, 1, 1);
1517 /* Because we're only doing syntax-checking, we'll never end up
1518 actually marking the variable as written. */
1519 if (flag_syntax_only
)
1520 TREE_ASM_WRITTEN (vtbl
) = 1;
1523 /* Since we're writing out the vtable here, also write the debug
1525 note_debug_info_needed (ctype
);
1530 /* A special return value from type_visibility meaning internal
1533 enum { VISIBILITY_ANON
= VISIBILITY_INTERNAL
+1 };
1535 /* walk_tree helper function for type_visibility. */
1538 min_vis_r (tree
*tp
, int *walk_subtrees
, void *data
)
1540 int *vis_p
= (int *)data
;
1545 else if (CLASS_TYPE_P (*tp
))
1547 if (!TREE_PUBLIC (TYPE_MAIN_DECL (*tp
)))
1549 *vis_p
= VISIBILITY_ANON
;
1552 else if (CLASSTYPE_VISIBILITY (*tp
) > *vis_p
)
1553 *vis_p
= CLASSTYPE_VISIBILITY (*tp
);
1558 /* Returns the visibility of TYPE, which is the minimum visibility of its
1562 type_visibility (tree type
)
1564 int vis
= VISIBILITY_DEFAULT
;
1565 walk_tree_without_duplicates (&type
, min_vis_r
, &vis
);
1569 /* Limit the visibility of DECL to VISIBILITY, if not explicitly
1570 specified (or if VISIBILITY is static). */
1573 constrain_visibility (tree decl
, int visibility
)
1575 if (visibility
== VISIBILITY_ANON
)
1577 /* extern "C" declarations aren't affected by the anonymous
1579 if (!DECL_EXTERN_C_P (decl
))
1581 TREE_PUBLIC (decl
) = 0;
1582 DECL_INTERFACE_KNOWN (decl
) = 1;
1583 if (DECL_LANG_SPECIFIC (decl
))
1584 DECL_NOT_REALLY_EXTERN (decl
) = 1;
1587 else if (visibility
> DECL_VISIBILITY (decl
)
1588 && !DECL_VISIBILITY_SPECIFIED (decl
))
1590 DECL_VISIBILITY (decl
) = visibility
;
1596 /* Constrain the visibility of DECL based on the visibility of its template
1600 constrain_visibility_for_template (tree decl
, tree targs
)
1602 /* If this is a template instantiation, check the innermost
1603 template args for visibility constraints. The outer template
1604 args are covered by the class check. */
1605 tree args
= INNERMOST_TEMPLATE_ARGS (targs
);
1607 for (i
= TREE_VEC_LENGTH (args
); i
> 0; --i
)
1611 tree arg
= TREE_VEC_ELT (args
, i
-1);
1613 vis
= type_visibility (arg
);
1614 else if (TREE_TYPE (arg
) && POINTER_TYPE_P (TREE_TYPE (arg
)))
1617 if (TREE_CODE (arg
) == ADDR_EXPR
)
1618 arg
= TREE_OPERAND (arg
, 0);
1619 if (TREE_CODE (arg
) == VAR_DECL
1620 || TREE_CODE (arg
) == FUNCTION_DECL
)
1622 if (! TREE_PUBLIC (arg
))
1623 vis
= VISIBILITY_ANON
;
1625 vis
= DECL_VISIBILITY (arg
);
1629 constrain_visibility (decl
, vis
);
1633 /* Like c_determine_visibility, but with additional C++-specific
1636 Function-scope entities can rely on the function's visibility because
1637 it is set in start_preparsed_function.
1639 Class-scope entities cannot rely on the class's visibility until the end
1640 of the enclosing class definition.
1642 Note that because namespaces have multiple independent definitions,
1643 namespace visibility is handled elsewhere using the #pragma visibility
1644 machinery rather than by decorating the namespace declaration.
1646 The goal is for constraints from the type to give a diagnostic, and
1647 other constraints to be applied silently. */
1650 determine_visibility (tree decl
)
1652 tree class_type
= NULL_TREE
;
1655 /* Remember that all decls get VISIBILITY_DEFAULT when built. */
1657 /* Only relevant for names with external linkage. */
1658 if (!TREE_PUBLIC (decl
))
1661 /* Cloned constructors and destructors get the same visibility as
1662 the underlying function. That should be set up in
1663 maybe_clone_body. */
1664 gcc_assert (!DECL_CLONED_FUNCTION_P (decl
));
1666 if (TREE_CODE (decl
) == TYPE_DECL
)
1668 if (CLASS_TYPE_P (TREE_TYPE (decl
)))
1669 use_template
= CLASSTYPE_USE_TEMPLATE (TREE_TYPE (decl
));
1670 else if (TYPE_TEMPLATE_INFO (TREE_TYPE (decl
)))
1675 else if (DECL_LANG_SPECIFIC (decl
))
1676 use_template
= DECL_USE_TEMPLATE (decl
);
1680 /* Anything that is exported must have default visibility. */
1681 if (TARGET_DLLIMPORT_DECL_ATTRIBUTES
1682 && lookup_attribute ("dllexport",
1683 TREE_CODE (decl
) == TYPE_DECL
1684 ? TYPE_ATTRIBUTES (TREE_TYPE (decl
))
1685 : DECL_ATTRIBUTES (decl
)))
1687 DECL_VISIBILITY (decl
) = VISIBILITY_DEFAULT
;
1688 DECL_VISIBILITY_SPECIFIED (decl
) = 1;
1691 /* If DECL is a member of a class, visibility specifiers on the
1692 class can influence the visibility of the DECL. */
1693 if (DECL_CLASS_SCOPE_P (decl
))
1694 class_type
= DECL_CONTEXT (decl
);
1695 else if (TREE_CODE (decl
) == VAR_DECL
1696 && DECL_TINFO_P (decl
)
1697 && CLASS_TYPE_P (TREE_TYPE (DECL_NAME (decl
))))
1698 class_type
= TREE_TYPE (DECL_NAME (decl
));
1701 /* Not a class member. */
1703 /* Virtual tables have DECL_CONTEXT set to their associated class,
1704 so they are automatically handled above. */
1705 gcc_assert (TREE_CODE (decl
) != VAR_DECL
1706 || !DECL_VTABLE_OR_VTT_P (decl
));
1708 if (DECL_FUNCTION_SCOPE_P (decl
) && ! DECL_VISIBILITY_SPECIFIED (decl
))
1710 /* Local statics and classes get the visibility of their
1711 containing function by default, except that
1712 -fvisibility-inlines-hidden doesn't affect them. */
1713 tree fn
= DECL_CONTEXT (decl
);
1714 if (DECL_VISIBILITY_SPECIFIED (fn
) || ! DECL_CLASS_SCOPE_P (fn
))
1716 DECL_VISIBILITY (decl
) = DECL_VISIBILITY (fn
);
1717 DECL_VISIBILITY_SPECIFIED (decl
) =
1718 DECL_VISIBILITY_SPECIFIED (fn
);
1721 determine_visibility_from_class (decl
, DECL_CONTEXT (fn
));
1723 /* Local classes in templates have CLASSTYPE_USE_TEMPLATE set,
1724 but have no TEMPLATE_INFO, so don't try to check it. */
1727 else if (TREE_CODE (decl
) == VAR_DECL
&& DECL_TINFO_P (decl
))
1729 /* tinfo visibility is based on the type it's for. */
1730 constrain_visibility
1731 (decl
, type_visibility (TREE_TYPE (DECL_NAME (decl
))));
1733 else if (use_template
)
1734 /* Template instantiations and specializations get visibility based
1735 on their template unless they override it with an attribute. */;
1736 else if (! DECL_VISIBILITY_SPECIFIED (decl
))
1738 /* Set default visibility to whatever the user supplied with
1739 #pragma GCC visibility or a namespace visibility attribute. */
1740 DECL_VISIBILITY (decl
) = default_visibility
;
1741 DECL_VISIBILITY_SPECIFIED (decl
) = visibility_options
.inpragma
;
1747 /* If the specialization doesn't specify visibility, use the
1748 visibility from the template. */
1749 tree tinfo
= (TREE_CODE (decl
) == TYPE_DECL
1750 ? TYPE_TEMPLATE_INFO (TREE_TYPE (decl
))
1751 : DECL_TEMPLATE_INFO (decl
));
1752 tree args
= TI_ARGS (tinfo
);
1754 if (args
!= error_mark_node
)
1756 int depth
= TMPL_ARGS_DEPTH (args
);
1757 tree pattern
= DECL_TEMPLATE_RESULT (TI_TEMPLATE (tinfo
));
1759 if (!DECL_VISIBILITY_SPECIFIED (decl
))
1761 DECL_VISIBILITY (decl
) = DECL_VISIBILITY (pattern
);
1762 DECL_VISIBILITY_SPECIFIED (decl
)
1763 = DECL_VISIBILITY_SPECIFIED (pattern
);
1766 /* FIXME should TMPL_ARGS_DEPTH really return 1 for null input? */
1767 if (args
&& depth
> template_class_depth (class_type
))
1768 /* Limit visibility based on its template arguments. */
1769 constrain_visibility_for_template (decl
, args
);
1774 determine_visibility_from_class (decl
, class_type
);
1776 if (decl_anon_ns_mem_p (decl
))
1777 /* Names in an anonymous namespace get internal linkage.
1778 This might change once we implement export. */
1779 constrain_visibility (decl
, VISIBILITY_ANON
);
1780 else if (TREE_CODE (decl
) != TYPE_DECL
)
1782 /* Propagate anonymity from type to decl. */
1783 int tvis
= type_visibility (TREE_TYPE (decl
));
1784 if (tvis
== VISIBILITY_ANON
)
1785 constrain_visibility (decl
, tvis
);
1789 /* By default, static data members and function members receive
1790 the visibility of their containing class. */
1793 determine_visibility_from_class (tree decl
, tree class_type
)
1795 if (visibility_options
.inlines_hidden
1796 /* Don't do this for inline templates; specializations might not be
1797 inline, and we don't want them to inherit the hidden
1798 visibility. We'll set it here for all inline instantiations. */
1799 && !processing_template_decl
1800 && ! DECL_VISIBILITY_SPECIFIED (decl
)
1801 && TREE_CODE (decl
) == FUNCTION_DECL
1802 && DECL_DECLARED_INLINE_P (decl
)
1803 && (! DECL_LANG_SPECIFIC (decl
)
1804 || ! DECL_EXPLICIT_INSTANTIATION (decl
)))
1805 DECL_VISIBILITY (decl
) = VISIBILITY_HIDDEN
;
1806 else if (!DECL_VISIBILITY_SPECIFIED (decl
))
1808 /* Default to the class visibility. */
1809 DECL_VISIBILITY (decl
) = CLASSTYPE_VISIBILITY (class_type
);
1810 DECL_VISIBILITY_SPECIFIED (decl
)
1811 = CLASSTYPE_VISIBILITY_SPECIFIED (class_type
);
1814 /* Give the target a chance to override the visibility associated
1816 if (TREE_CODE (decl
) == VAR_DECL
1817 && (DECL_TINFO_P (decl
)
1818 || (DECL_VTABLE_OR_VTT_P (decl
)
1819 /* Construction virtual tables are not exported because
1820 they cannot be referred to from other object files;
1821 their name is not standardized by the ABI. */
1822 && !DECL_CONSTRUCTION_VTABLE_P (decl
)))
1823 && TREE_PUBLIC (decl
)
1824 && !DECL_REALLY_EXTERN (decl
)
1825 && !DECL_VISIBILITY_SPECIFIED (decl
)
1826 && !CLASSTYPE_VISIBILITY_SPECIFIED (class_type
))
1827 targetm
.cxx
.determine_class_data_visibility (decl
);
1830 /* Constrain the visibility of a class TYPE based on the visibility of its
1831 field types. Warn if any fields require lesser visibility. */
1834 constrain_class_visibility (tree type
)
1840 int vis
= type_visibility (type
);
1842 if (vis
== VISIBILITY_ANON
1843 || DECL_IN_SYSTEM_HEADER (TYPE_MAIN_DECL (type
)))
1846 /* Don't warn about visibility if the class has explicit visibility. */
1847 if (CLASSTYPE_VISIBILITY_SPECIFIED (type
))
1848 vis
= VISIBILITY_INTERNAL
;
1850 for (t
= TYPE_FIELDS (type
); t
; t
= TREE_CHAIN (t
))
1851 if (TREE_CODE (t
) == FIELD_DECL
&& TREE_TYPE (t
) != error_mark_node
)
1853 tree ftype
= strip_array_types (TREE_TYPE (t
));
1854 int subvis
= type_visibility (ftype
);
1856 if (subvis
== VISIBILITY_ANON
)
1858 %qT has a field %qD whose type uses the anonymous namespace",
1860 else if (IS_AGGR_TYPE (ftype
)
1861 && vis
< VISIBILITY_HIDDEN
1862 && subvis
>= VISIBILITY_HIDDEN
)
1863 warning (OPT_Wattributes
, "\
1864 %qT declared with greater visibility than the type of its field %qD",
1868 binfo
= TYPE_BINFO (type
);
1869 for (i
= 0; BINFO_BASE_ITERATE (binfo
, i
, t
); ++i
)
1871 int subvis
= type_visibility (TREE_TYPE (t
));
1873 if (subvis
== VISIBILITY_ANON
)
1875 %qT has a base %qT whose type uses the anonymous namespace",
1876 type
, TREE_TYPE (t
));
1877 else if (vis
< VISIBILITY_HIDDEN
1878 && subvis
>= VISIBILITY_HIDDEN
)
1879 warning (OPT_Wattributes
, "\
1880 %qT declared with greater visibility than its base %qT",
1881 type
, TREE_TYPE (t
));
1885 /* DECL is a FUNCTION_DECL or VAR_DECL. If the object file linkage
1886 for DECL has not already been determined, do so now by setting
1887 DECL_EXTERNAL, DECL_COMDAT and other related flags. Until this
1888 function is called entities with vague linkage whose definitions
1889 are available must have TREE_PUBLIC set.
1891 If this function decides to place DECL in COMDAT, it will set
1892 appropriate flags -- but will not clear DECL_EXTERNAL. It is up to
1893 the caller to decide whether or not to clear DECL_EXTERNAL. Some
1894 callers defer that decision until it is clear that DECL is actually
1898 import_export_decl (tree decl
)
1903 tree class_type
= NULL_TREE
;
1905 if (DECL_INTERFACE_KNOWN (decl
))
1908 /* We cannot determine what linkage to give to an entity with vague
1909 linkage until the end of the file. For example, a virtual table
1910 for a class will be defined if and only if the key method is
1911 defined in this translation unit. As a further example, consider
1912 that when compiling a translation unit that uses PCH file with
1913 "-frepo" it would be incorrect to make decisions about what
1914 entities to emit when building the PCH; those decisions must be
1915 delayed until the repository information has been processed. */
1916 gcc_assert (at_eof
);
1917 /* Object file linkage for explicit instantiations is handled in
1918 mark_decl_instantiated. For static variables in functions with
1919 vague linkage, maybe_commonize_var is used.
1921 Therefore, the only declarations that should be provided to this
1922 function are those with external linkage that are:
1924 * implicit instantiations of function templates
1928 * implicit instantiations of static data members of class
1935 Furthermore, all entities that reach this point must have a
1936 definition available in this translation unit.
1938 The following assertions check these conditions. */
1939 gcc_assert (TREE_CODE (decl
) == FUNCTION_DECL
1940 || TREE_CODE (decl
) == VAR_DECL
);
1941 /* Any code that creates entities with TREE_PUBLIC cleared should
1942 also set DECL_INTERFACE_KNOWN. */
1943 gcc_assert (TREE_PUBLIC (decl
));
1944 if (TREE_CODE (decl
) == FUNCTION_DECL
)
1945 gcc_assert (DECL_IMPLICIT_INSTANTIATION (decl
)
1946 || DECL_FRIEND_PSEUDO_TEMPLATE_INSTANTIATION (decl
)
1947 || DECL_DECLARED_INLINE_P (decl
));
1949 gcc_assert (DECL_IMPLICIT_INSTANTIATION (decl
)
1950 || DECL_VTABLE_OR_VTT_P (decl
)
1951 || DECL_TINFO_P (decl
));
1952 /* Check that a definition of DECL is available in this translation
1954 gcc_assert (!DECL_REALLY_EXTERN (decl
));
1956 /* Assume that DECL will not have COMDAT linkage. */
1958 /* Assume that DECL will not be imported into this translation
1962 /* See if the repository tells us whether or not to emit DECL in
1963 this translation unit. */
1964 emit_p
= repo_emit_p (decl
);
1967 else if (emit_p
== 1)
1969 /* The repository indicates that this entity should be defined
1970 here. Make sure the back end honors that request. */
1971 if (TREE_CODE (decl
) == VAR_DECL
)
1973 else if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (decl
)
1974 || DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P (decl
))
1977 FOR_EACH_CLONE (clone
, decl
)
1978 mark_needed (clone
);
1982 /* Output the definition as an ordinary strong definition. */
1983 DECL_EXTERNAL (decl
) = 0;
1984 DECL_INTERFACE_KNOWN (decl
) = 1;
1989 /* We have already decided what to do with this DECL; there is no
1990 need to check anything further. */
1992 else if (TREE_CODE (decl
) == VAR_DECL
&& DECL_VTABLE_OR_VTT_P (decl
))
1994 class_type
= DECL_CONTEXT (decl
);
1995 import_export_class (class_type
);
1996 if (TYPE_FOR_JAVA (class_type
))
1998 else if (CLASSTYPE_INTERFACE_KNOWN (class_type
)
1999 && CLASSTYPE_INTERFACE_ONLY (class_type
))
2001 else if ((!flag_weak
|| TARGET_WEAK_NOT_IN_ARCHIVE_TOC
)
2002 && !CLASSTYPE_USE_TEMPLATE (class_type
)
2003 && CLASSTYPE_KEY_METHOD (class_type
)
2004 && !DECL_DECLARED_INLINE_P (CLASSTYPE_KEY_METHOD (class_type
)))
2005 /* The ABI requires that all virtual tables be emitted with
2006 COMDAT linkage. However, on systems where COMDAT symbols
2007 don't show up in the table of contents for a static
2008 archive, or on systems without weak symbols (where we
2009 approximate COMDAT linkage by using internal linkage), the
2010 linker will report errors about undefined symbols because
2011 it will not see the virtual table definition. Therefore,
2012 in the case that we know that the virtual table will be
2013 emitted in only one translation unit, we make the virtual
2014 table an ordinary definition with external linkage. */
2015 DECL_EXTERNAL (decl
) = 0;
2016 else if (CLASSTYPE_INTERFACE_KNOWN (class_type
))
2018 /* CLASS_TYPE is being exported from this translation unit,
2019 so DECL should be defined here. */
2020 if (!flag_weak
&& CLASSTYPE_EXPLICIT_INSTANTIATION (class_type
))
2021 /* If a class is declared in a header with the "extern
2022 template" extension, then it will not be instantiated,
2023 even in translation units that would normally require
2024 it. Often such classes are explicitly instantiated in
2025 one translation unit. Therefore, the explicit
2026 instantiation must be made visible to other translation
2028 DECL_EXTERNAL (decl
) = 0;
2031 /* The generic C++ ABI says that class data is always
2032 COMDAT, even if there is a key function. Some
2033 variants (e.g., the ARM EABI) says that class data
2034 only has COMDAT linkage if the class data might be
2035 emitted in more than one translation unit. When the
2036 key method can be inline and is inline, we still have
2037 to arrange for comdat even though
2038 class_data_always_comdat is false. */
2039 if (!CLASSTYPE_KEY_METHOD (class_type
)
2040 || DECL_DECLARED_INLINE_P (CLASSTYPE_KEY_METHOD (class_type
))
2041 || targetm
.cxx
.class_data_always_comdat ())
2043 /* The ABI requires COMDAT linkage. Normally, we
2044 only emit COMDAT things when they are needed;
2045 make sure that we realize that this entity is
2052 else if (!flag_implicit_templates
2053 && CLASSTYPE_IMPLICIT_INSTANTIATION (class_type
))
2058 else if (TREE_CODE (decl
) == VAR_DECL
&& DECL_TINFO_P (decl
))
2060 tree type
= TREE_TYPE (DECL_NAME (decl
));
2061 if (CLASS_TYPE_P (type
))
2064 import_export_class (type
);
2065 if (CLASSTYPE_INTERFACE_KNOWN (type
)
2066 && TYPE_POLYMORPHIC_P (type
)
2067 && CLASSTYPE_INTERFACE_ONLY (type
)
2068 /* If -fno-rtti was specified, then we cannot be sure
2069 that RTTI information will be emitted with the
2070 virtual table of the class, so we must emit it
2071 wherever it is used. */
2076 if (CLASSTYPE_INTERFACE_KNOWN (type
)
2077 && !CLASSTYPE_INTERFACE_ONLY (type
))
2079 comdat_p
= (targetm
.cxx
.class_data_always_comdat ()
2080 || (CLASSTYPE_KEY_METHOD (type
)
2081 && DECL_DECLARED_INLINE_P (CLASSTYPE_KEY_METHOD (type
))));
2086 DECL_EXTERNAL (decl
) = 0;
2096 else if (DECL_TEMPLATE_INSTANTIATION (decl
)
2097 || DECL_FRIEND_PSEUDO_TEMPLATE_INSTANTIATION (decl
))
2099 /* DECL is an implicit instantiation of a function or static
2101 if (flag_implicit_templates
2102 || (flag_implicit_inline_templates
2103 && TREE_CODE (decl
) == FUNCTION_DECL
2104 && DECL_DECLARED_INLINE_P (decl
)))
2107 /* If we are not implicitly generating templates, then mark
2108 this entity as undefined in this translation unit. */
2111 else if (DECL_FUNCTION_MEMBER_P (decl
))
2113 if (!DECL_DECLARED_INLINE_P (decl
))
2115 tree ctype
= DECL_CONTEXT (decl
);
2116 import_export_class (ctype
);
2117 if (CLASSTYPE_INTERFACE_KNOWN (ctype
))
2119 DECL_NOT_REALLY_EXTERN (decl
)
2120 = ! (CLASSTYPE_INTERFACE_ONLY (ctype
)
2121 || (DECL_DECLARED_INLINE_P (decl
)
2122 && ! flag_implement_inlines
2123 && !DECL_VINDEX (decl
)));
2125 if (!DECL_NOT_REALLY_EXTERN (decl
))
2126 DECL_EXTERNAL (decl
) = 1;
2128 /* Always make artificials weak. */
2129 if (DECL_ARTIFICIAL (decl
) && flag_weak
)
2132 maybe_make_one_only (decl
);
2143 /* If we are importing DECL into this translation unit, mark is
2144 an undefined here. */
2145 DECL_EXTERNAL (decl
) = 1;
2146 DECL_NOT_REALLY_EXTERN (decl
) = 0;
2150 /* If we decided to put DECL in COMDAT, mark it accordingly at
2152 comdat_linkage (decl
);
2155 DECL_INTERFACE_KNOWN (decl
) = 1;
2158 /* Return an expression that performs the destruction of DECL, which
2159 must be a VAR_DECL whose type has a non-trivial destructor, or is
2160 an array whose (innermost) elements have a non-trivial destructor. */
2163 build_cleanup (tree decl
)
2166 tree type
= TREE_TYPE (decl
);
2168 /* This function should only be called for declarations that really
2169 require cleanups. */
2170 gcc_assert (!TYPE_HAS_TRIVIAL_DESTRUCTOR (type
));
2172 /* Treat all objects with destructors as used; the destructor may do
2173 something substantive. */
2176 if (TREE_CODE (type
) == ARRAY_TYPE
)
2180 cxx_mark_addressable (decl
);
2181 temp
= build1 (ADDR_EXPR
, build_pointer_type (type
), decl
);
2183 temp
= build_delete (TREE_TYPE (temp
), temp
,
2184 sfk_complete_destructor
,
2185 LOOKUP_NORMAL
|LOOKUP_NONVIRTUAL
|LOOKUP_DESTRUCTOR
, 0);
2189 /* Returns the initialization guard variable for the variable DECL,
2190 which has static storage duration. */
2193 get_guard (tree decl
)
2198 sname
= mangle_guard_variable (decl
);
2199 guard
= IDENTIFIER_GLOBAL_VALUE (sname
);
2204 /* We use a type that is big enough to contain a mutex as well
2205 as an integer counter. */
2206 guard_type
= targetm
.cxx
.guard_type ();
2207 guard
= build_decl (VAR_DECL
, sname
, guard_type
);
2209 /* The guard should have the same linkage as what it guards. */
2210 TREE_PUBLIC (guard
) = TREE_PUBLIC (decl
);
2211 TREE_STATIC (guard
) = TREE_STATIC (decl
);
2212 DECL_COMMON (guard
) = DECL_COMMON (decl
);
2213 DECL_ONE_ONLY (guard
) = DECL_ONE_ONLY (decl
);
2214 if (TREE_PUBLIC (decl
))
2215 DECL_WEAK (guard
) = DECL_WEAK (decl
);
2217 DECL_ARTIFICIAL (guard
) = 1;
2218 DECL_IGNORED_P (guard
) = 1;
2219 TREE_USED (guard
) = 1;
2220 pushdecl_top_level_and_finish (guard
, NULL_TREE
);
2225 /* Return those bits of the GUARD variable that should be set when the
2226 guarded entity is actually initialized. */
2229 get_guard_bits (tree guard
)
2231 if (!targetm
.cxx
.guard_mask_bit ())
2233 /* We only set the first byte of the guard, in order to leave room
2234 for a mutex in the high-order bits. */
2235 guard
= build1 (ADDR_EXPR
,
2236 build_pointer_type (TREE_TYPE (guard
)),
2238 guard
= build1 (NOP_EXPR
,
2239 build_pointer_type (char_type_node
),
2241 guard
= build1 (INDIRECT_REF
, char_type_node
, guard
);
2247 /* Return an expression which determines whether or not the GUARD
2248 variable has already been initialized. */
2251 get_guard_cond (tree guard
)
2255 /* Check to see if the GUARD is zero. */
2256 guard
= get_guard_bits (guard
);
2258 /* Mask off all but the low bit. */
2259 if (targetm
.cxx
.guard_mask_bit ())
2261 guard_value
= integer_one_node
;
2262 if (!same_type_p (TREE_TYPE (guard_value
), TREE_TYPE (guard
)))
2263 guard_value
= convert (TREE_TYPE (guard
), guard_value
);
2264 guard
= cp_build_binary_op (BIT_AND_EXPR
, guard
, guard_value
);
2267 guard_value
= integer_zero_node
;
2268 if (!same_type_p (TREE_TYPE (guard_value
), TREE_TYPE (guard
)))
2269 guard_value
= convert (TREE_TYPE (guard
), guard_value
);
2270 return cp_build_binary_op (EQ_EXPR
, guard
, guard_value
);
2273 /* Return an expression which sets the GUARD variable, indicating that
2274 the variable being guarded has been initialized. */
2277 set_guard (tree guard
)
2281 /* Set the GUARD to one. */
2282 guard
= get_guard_bits (guard
);
2283 guard_init
= integer_one_node
;
2284 if (!same_type_p (TREE_TYPE (guard_init
), TREE_TYPE (guard
)))
2285 guard_init
= convert (TREE_TYPE (guard
), guard_init
);
2286 return build_modify_expr (guard
, NOP_EXPR
, guard_init
);
2289 /* Start the process of running a particular set of global constructors
2290 or destructors. Subroutine of do_[cd]tors. */
2293 start_objects (int method_type
, int initp
)
2299 /* Make ctor or dtor function. METHOD_TYPE may be 'I' or 'D'. */
2301 if (initp
!= DEFAULT_INIT_PRIORITY
)
2311 sprintf (type
, "%c%c%.5u", method_type
, joiner
, initp
);
2314 sprintf (type
, "%c", method_type
);
2316 fndecl
= build_lang_decl (FUNCTION_DECL
,
2317 get_file_function_name (type
),
2318 build_function_type (void_type_node
,
2320 start_preparsed_function (fndecl
, /*attrs=*/NULL_TREE
, SF_PRE_PARSED
);
2322 /* It can be a static function as long as collect2 does not have
2323 to scan the object file to find its ctor/dtor routine. */
2324 TREE_PUBLIC (current_function_decl
) = ! targetm
.have_ctors_dtors
;
2326 /* Mark this declaration as used to avoid spurious warnings. */
2327 TREE_USED (current_function_decl
) = 1;
2329 /* Mark this function as a global constructor or destructor. */
2330 if (method_type
== 'I')
2331 DECL_GLOBAL_CTOR_P (current_function_decl
) = 1;
2333 DECL_GLOBAL_DTOR_P (current_function_decl
) = 1;
2334 DECL_LANG_SPECIFIC (current_function_decl
)->decl_flags
.u2sel
= 1;
2336 body
= begin_compound_stmt (BCS_FN_BODY
);
2341 /* Finish the process of running a particular set of global constructors
2342 or destructors. Subroutine of do_[cd]tors. */
2345 finish_objects (int method_type
, int initp
, tree body
)
2350 finish_compound_stmt (body
);
2351 fn
= finish_function (0);
2352 expand_or_defer_fn (fn
);
2354 /* When only doing semantic analysis, and no RTL generation, we
2355 can't call functions that directly emit assembly code; there is
2356 no assembly file in which to put the code. */
2357 if (flag_syntax_only
)
2360 if (targetm
.have_ctors_dtors
)
2362 rtx fnsym
= XEXP (DECL_RTL (fn
), 0);
2363 cgraph_mark_needed_node (cgraph_node (fn
));
2364 if (method_type
== 'I')
2365 (* targetm
.asm_out
.constructor
) (fnsym
, initp
);
2367 (* targetm
.asm_out
.destructor
) (fnsym
, initp
);
2371 /* The names of the parameters to the function created to handle
2372 initializations and destructions for objects with static storage
2374 #define INITIALIZE_P_IDENTIFIER "__initialize_p"
2375 #define PRIORITY_IDENTIFIER "__priority"
2377 /* The name of the function we create to handle initializations and
2378 destructions for objects with static storage duration. */
2379 #define SSDF_IDENTIFIER "__static_initialization_and_destruction"
2381 /* The declaration for the __INITIALIZE_P argument. */
2382 static GTY(()) tree initialize_p_decl
;
2384 /* The declaration for the __PRIORITY argument. */
2385 static GTY(()) tree priority_decl
;
2387 /* The declaration for the static storage duration function. */
2388 static GTY(()) tree ssdf_decl
;
2390 /* All the static storage duration functions created in this
2391 translation unit. */
2392 static GTY(()) VEC(tree
,gc
) *ssdf_decls
;
2394 /* A map from priority levels to information about that priority
2395 level. There may be many such levels, so efficient lookup is
2397 static splay_tree priority_info_map
;
2399 /* Begins the generation of the function that will handle all
2400 initialization and destruction of objects with static storage
2401 duration. The function generated takes two parameters of type
2402 `int': __INITIALIZE_P and __PRIORITY. If __INITIALIZE_P is
2403 nonzero, it performs initializations. Otherwise, it performs
2404 destructions. It only performs those initializations or
2405 destructions with the indicated __PRIORITY. The generated function
2408 It is assumed that this function will only be called once per
2409 translation unit. */
2412 start_static_storage_duration_function (unsigned count
)
2417 char id
[sizeof (SSDF_IDENTIFIER
) + 1 /* '\0' */ + 32];
2419 /* Create the identifier for this function. It will be of the form
2420 SSDF_IDENTIFIER_<number>. */
2421 sprintf (id
, "%s_%u", SSDF_IDENTIFIER
, count
);
2423 /* Create the parameters. */
2424 parm_types
= void_list_node
;
2425 parm_types
= tree_cons (NULL_TREE
, integer_type_node
, parm_types
);
2426 parm_types
= tree_cons (NULL_TREE
, integer_type_node
, parm_types
);
2427 type
= build_function_type (void_type_node
, parm_types
);
2429 /* Create the FUNCTION_DECL itself. */
2430 ssdf_decl
= build_lang_decl (FUNCTION_DECL
,
2431 get_identifier (id
),
2433 TREE_PUBLIC (ssdf_decl
) = 0;
2434 DECL_ARTIFICIAL (ssdf_decl
) = 1;
2435 DECL_INLINE (ssdf_decl
) = 1;
2437 /* Put this function in the list of functions to be called from the
2438 static constructors and destructors. */
2441 ssdf_decls
= VEC_alloc (tree
, gc
, 32);
2443 /* Take this opportunity to initialize the map from priority
2444 numbers to information about that priority level. */
2445 priority_info_map
= splay_tree_new (splay_tree_compare_ints
,
2446 /*delete_key_fn=*/0,
2447 /*delete_value_fn=*/
2448 (splay_tree_delete_value_fn
) &free
);
2450 /* We always need to generate functions for the
2451 DEFAULT_INIT_PRIORITY so enter it now. That way when we walk
2452 priorities later, we'll be sure to find the
2453 DEFAULT_INIT_PRIORITY. */
2454 get_priority_info (DEFAULT_INIT_PRIORITY
);
2457 VEC_safe_push (tree
, gc
, ssdf_decls
, ssdf_decl
);
2459 /* Create the argument list. */
2460 initialize_p_decl
= cp_build_parm_decl
2461 (get_identifier (INITIALIZE_P_IDENTIFIER
), integer_type_node
);
2462 DECL_CONTEXT (initialize_p_decl
) = ssdf_decl
;
2463 TREE_USED (initialize_p_decl
) = 1;
2464 priority_decl
= cp_build_parm_decl
2465 (get_identifier (PRIORITY_IDENTIFIER
), integer_type_node
);
2466 DECL_CONTEXT (priority_decl
) = ssdf_decl
;
2467 TREE_USED (priority_decl
) = 1;
2469 TREE_CHAIN (initialize_p_decl
) = priority_decl
;
2470 DECL_ARGUMENTS (ssdf_decl
) = initialize_p_decl
;
2472 /* Put the function in the global scope. */
2473 pushdecl (ssdf_decl
);
2475 /* Start the function itself. This is equivalent to declaring the
2478 static void __ssdf (int __initialize_p, init __priority_p);
2480 It is static because we only need to call this function from the
2481 various constructor and destructor functions for this module. */
2482 start_preparsed_function (ssdf_decl
,
2483 /*attrs=*/NULL_TREE
,
2486 /* Set up the scope of the outermost block in the function. */
2487 body
= begin_compound_stmt (BCS_FN_BODY
);
2492 /* Finish the generation of the function which performs initialization
2493 and destruction of objects with static storage duration. After
2494 this point, no more such objects can be created. */
2497 finish_static_storage_duration_function (tree body
)
2499 /* Close out the function. */
2500 finish_compound_stmt (body
);
2501 expand_or_defer_fn (finish_function (0));
2504 /* Return the information about the indicated PRIORITY level. If no
2505 code to handle this level has yet been generated, generate the
2506 appropriate prologue. */
2508 static priority_info
2509 get_priority_info (int priority
)
2514 n
= splay_tree_lookup (priority_info_map
,
2515 (splay_tree_key
) priority
);
2518 /* Create a new priority information structure, and insert it
2520 pi
= XNEW (struct priority_info_s
);
2521 pi
->initializations_p
= 0;
2522 pi
->destructions_p
= 0;
2523 splay_tree_insert (priority_info_map
,
2524 (splay_tree_key
) priority
,
2525 (splay_tree_value
) pi
);
2528 pi
= (priority_info
) n
->value
;
2533 /* The effective initialization priority of a DECL. */
2535 #define DECL_EFFECTIVE_INIT_PRIORITY(decl) \
2536 ((!DECL_HAS_INIT_PRIORITY_P (decl) || DECL_INIT_PRIORITY (decl) == 0) \
2537 ? DEFAULT_INIT_PRIORITY : DECL_INIT_PRIORITY (decl))
2539 /* Whether a DECL needs a guard to protect it against multiple
2542 #define NEEDS_GUARD_P(decl) (TREE_PUBLIC (decl) && (DECL_COMMON (decl) \
2543 || DECL_ONE_ONLY (decl) \
2544 || DECL_WEAK (decl)))
2546 /* Set up to handle the initialization or destruction of DECL. If
2547 INITP is nonzero, we are initializing the variable. Otherwise, we
2548 are destroying it. */
2551 one_static_initialization_or_destruction (tree decl
, tree init
, bool initp
)
2553 tree guard_if_stmt
= NULL_TREE
;
2556 /* If we are supposed to destruct and there's a trivial destructor,
2557 nothing has to be done. */
2559 && TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl
)))
2562 /* Trick the compiler into thinking we are at the file and line
2563 where DECL was declared so that error-messages make sense, and so
2564 that the debugger will show somewhat sensible file and line
2566 input_location
= DECL_SOURCE_LOCATION (decl
);
2572 Access control for implicit calls to the constructors,
2573 the conversion functions, or the destructor called to
2574 create and destroy a static data member is performed as
2575 if these calls appeared in the scope of the member's
2578 we pretend we are in a static member function of the class of
2579 which the DECL is a member. */
2580 if (member_p (decl
))
2582 DECL_CONTEXT (current_function_decl
) = DECL_CONTEXT (decl
);
2583 DECL_STATIC_FUNCTION_P (current_function_decl
) = 1;
2586 /* Assume we don't need a guard. */
2588 /* We need a guard if this is an object with external linkage that
2589 might be initialized in more than one place. (For example, a
2590 static data member of a template, when the data member requires
2592 if (NEEDS_GUARD_P (decl
))
2596 guard
= get_guard (decl
);
2598 /* When using __cxa_atexit, we just check the GUARD as we would
2599 for a local static. */
2600 if (flag_use_cxa_atexit
)
2602 /* When using __cxa_atexit, we never try to destroy
2603 anything from a static destructor. */
2605 guard_cond
= get_guard_cond (guard
);
2607 /* If we don't have __cxa_atexit, then we will be running
2608 destructors from .fini sections, or their equivalents. So,
2609 we need to know how many times we've tried to initialize this
2610 object. We do initializations only if the GUARD is zero,
2611 i.e., if we are the first to initialize the variable. We do
2612 destructions only if the GUARD is one, i.e., if we are the
2613 last to destroy the variable. */
2616 = cp_build_binary_op (EQ_EXPR
,
2617 build_unary_op (PREINCREMENT_EXPR
,
2623 = cp_build_binary_op (EQ_EXPR
,
2624 build_unary_op (PREDECREMENT_EXPR
,
2629 guard_if_stmt
= begin_if_stmt ();
2630 finish_if_stmt_cond (guard_cond
, guard_if_stmt
);
2634 /* If we're using __cxa_atexit, we have not already set the GUARD,
2635 so we must do so now. */
2636 if (guard
&& initp
&& flag_use_cxa_atexit
)
2637 finish_expr_stmt (set_guard (guard
));
2639 /* Perform the initialization or destruction. */
2643 finish_expr_stmt (init
);
2645 /* If we're using __cxa_atexit, register a function that calls the
2646 destructor for the object. */
2647 if (flag_use_cxa_atexit
)
2648 finish_expr_stmt (register_dtor_fn (decl
));
2651 finish_expr_stmt (build_cleanup (decl
));
2653 /* Finish the guard if-stmt, if necessary. */
2656 finish_then_clause (guard_if_stmt
);
2657 finish_if_stmt (guard_if_stmt
);
2660 /* Now that we're done with DECL we don't need to pretend to be a
2661 member of its class any longer. */
2662 DECL_CONTEXT (current_function_decl
) = NULL_TREE
;
2663 DECL_STATIC_FUNCTION_P (current_function_decl
) = 0;
2666 /* Generate code to do the initialization or destruction of the decls in VARS,
2667 a TREE_LIST of VAR_DECL with static storage duration.
2668 Whether initialization or destruction is performed is specified by INITP. */
2671 do_static_initialization_or_destruction (tree vars
, bool initp
)
2673 tree node
, init_if_stmt
, cond
;
2675 /* Build the outer if-stmt to check for initialization or destruction. */
2676 init_if_stmt
= begin_if_stmt ();
2677 cond
= initp
? integer_one_node
: integer_zero_node
;
2678 cond
= cp_build_binary_op (EQ_EXPR
,
2681 finish_if_stmt_cond (cond
, init_if_stmt
);
2685 tree decl
= TREE_VALUE (node
);
2686 tree priority_if_stmt
;
2690 /* If we don't need a destructor, there's nothing to do. Avoid
2691 creating a possibly empty if-stmt. */
2692 if (!initp
&& TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl
)))
2694 node
= TREE_CHAIN (node
);
2698 /* Remember that we had an initialization or finalization at this
2700 priority
= DECL_EFFECTIVE_INIT_PRIORITY (decl
);
2701 pi
= get_priority_info (priority
);
2703 pi
->initializations_p
= 1;
2705 pi
->destructions_p
= 1;
2707 /* Conditionalize this initialization on being in the right priority
2708 and being initializing/finalizing appropriately. */
2709 priority_if_stmt
= begin_if_stmt ();
2710 cond
= cp_build_binary_op (EQ_EXPR
,
2712 build_int_cst (NULL_TREE
, priority
));
2713 finish_if_stmt_cond (cond
, priority_if_stmt
);
2715 /* Process initializers with same priority. */
2717 && DECL_EFFECTIVE_INIT_PRIORITY (TREE_VALUE (node
)) == priority
;
2718 node
= TREE_CHAIN (node
))
2719 /* Do one initialization or destruction. */
2720 one_static_initialization_or_destruction (TREE_VALUE (node
),
2721 TREE_PURPOSE (node
), initp
);
2723 /* Finish up the priority if-stmt body. */
2724 finish_then_clause (priority_if_stmt
);
2725 finish_if_stmt (priority_if_stmt
);
2729 /* Finish up the init/destruct if-stmt body. */
2730 finish_then_clause (init_if_stmt
);
2731 finish_if_stmt (init_if_stmt
);
2734 /* VARS is a list of variables with static storage duration which may
2735 need initialization and/or finalization. Remove those variables
2736 that don't really need to be initialized or finalized, and return
2737 the resulting list. The order in which the variables appear in
2738 VARS is in reverse order of the order in which they should actually
2739 be initialized. The list we return is in the unreversed order;
2740 i.e., the first variable should be initialized first. */
2743 prune_vars_needing_no_initialization (tree
*vars
)
2746 tree result
= NULL_TREE
;
2751 tree decl
= TREE_VALUE (t
);
2752 tree init
= TREE_PURPOSE (t
);
2754 /* Deal gracefully with error. */
2755 if (decl
== error_mark_node
)
2757 var
= &TREE_CHAIN (t
);
2761 /* The only things that can be initialized are variables. */
2762 gcc_assert (TREE_CODE (decl
) == VAR_DECL
);
2764 /* If this object is not defined, we don't need to do anything
2766 if (DECL_EXTERNAL (decl
))
2768 var
= &TREE_CHAIN (t
);
2772 /* Also, if the initializer already contains errors, we can bail
2774 if (init
&& TREE_CODE (init
) == TREE_LIST
2775 && value_member (error_mark_node
, init
))
2777 var
= &TREE_CHAIN (t
);
2781 /* This variable is going to need initialization and/or
2782 finalization, so we add it to the list. */
2783 *var
= TREE_CHAIN (t
);
2784 TREE_CHAIN (t
) = result
;
2791 /* Make sure we have told the back end about all the variables in
2795 write_out_vars (tree vars
)
2799 for (v
= vars
; v
; v
= TREE_CHAIN (v
))
2801 tree var
= TREE_VALUE (v
);
2802 if (!var_finalized_p (var
))
2804 import_export_decl (var
);
2805 rest_of_decl_compilation (var
, 1, 1);
2810 /* Generate a static constructor (if CONSTRUCTOR_P) or destructor
2811 (otherwise) that will initialize all global objects with static
2812 storage duration having the indicated PRIORITY. */
2815 generate_ctor_or_dtor_function (bool constructor_p
, int priority
,
2824 input_location
= *locus
;
2825 #ifdef USE_MAPPED_LOCATION
2831 /* We use `I' to indicate initialization and `D' to indicate
2833 function_key
= constructor_p
? 'I' : 'D';
2835 /* We emit the function lazily, to avoid generating empty
2836 global constructors and destructors. */
2839 /* For Objective-C++, we may need to initialize metadata found in this module.
2840 This must be done _before_ any other static initializations. */
2841 if (c_dialect_objc () && (priority
== DEFAULT_INIT_PRIORITY
)
2842 && constructor_p
&& objc_static_init_needed_p ())
2844 body
= start_objects (function_key
, priority
);
2845 objc_generate_static_init_call (NULL_TREE
);
2848 /* Call the static storage duration function with appropriate
2850 for (i
= 0; VEC_iterate (tree
, ssdf_decls
, i
, fndecl
); ++i
)
2852 /* Calls to pure or const functions will expand to nothing. */
2853 if (! (flags_from_decl_or_type (fndecl
) & (ECF_CONST
| ECF_PURE
)))
2856 body
= start_objects (function_key
, priority
);
2858 arguments
= tree_cons (NULL_TREE
,
2859 build_int_cst (NULL_TREE
, priority
),
2861 arguments
= tree_cons (NULL_TREE
,
2862 build_int_cst (NULL_TREE
, constructor_p
),
2864 finish_expr_stmt (build_function_call (fndecl
, arguments
));
2868 /* Close out the function. */
2870 finish_objects (function_key
, priority
, body
);
2873 /* Generate constructor and destructor functions for the priority
2877 generate_ctor_and_dtor_functions_for_priority (splay_tree_node n
, void * data
)
2879 location_t
*locus
= (location_t
*) data
;
2880 int priority
= (int) n
->key
;
2881 priority_info pi
= (priority_info
) n
->value
;
2883 /* Generate the functions themselves, but only if they are really
2885 if (pi
->initializations_p
)
2886 generate_ctor_or_dtor_function (/*constructor_p=*/true, priority
, locus
);
2887 if (pi
->destructions_p
)
2888 generate_ctor_or_dtor_function (/*constructor_p=*/false, priority
, locus
);
2890 /* Keep iterating. */
2894 /* Called via LANGHOOK_CALLGRAPH_ANALYZE_EXPR. It is supposed to mark
2895 decls referenced from front-end specific constructs; it will be called
2896 only for language-specific tree nodes.
2898 Here we must deal with member pointers. */
2901 cxx_callgraph_analyze_expr (tree
*tp
, int *walk_subtrees ATTRIBUTE_UNUSED
,
2902 tree from ATTRIBUTE_UNUSED
)
2906 switch (TREE_CODE (t
))
2909 if (TYPE_PTRMEMFUNC_P (TREE_TYPE (t
)))
2910 cgraph_mark_needed_node (cgraph_node (PTRMEM_CST_MEMBER (t
)));
2913 if (TREE_CODE (BASELINK_FUNCTIONS (t
)) == FUNCTION_DECL
)
2914 cgraph_mark_needed_node (cgraph_node (BASELINK_FUNCTIONS (t
)));
2917 if (DECL_VTABLE_OR_VTT_P (t
))
2919 /* The ABI requires that all virtual tables be emitted
2920 whenever one of them is. */
2922 for (vtbl
= CLASSTYPE_VTABLES (DECL_CONTEXT (t
));
2924 vtbl
= TREE_CHAIN (vtbl
))
2925 mark_decl_referenced (vtbl
);
2927 else if (DECL_CONTEXT (t
)
2928 && TREE_CODE (DECL_CONTEXT (t
)) == FUNCTION_DECL
)
2929 /* If we need a static variable in a function, then we
2930 need the containing function. */
2931 mark_decl_referenced (DECL_CONTEXT (t
));
2940 /* Java requires that we be able to reference a local address for a
2941 method, and not be confused by PLT entries. If hidden aliases are
2942 supported, emit one for each java function that we've emitted. */
2945 build_java_method_aliases (void)
2947 struct cgraph_node
*node
;
2949 #ifndef HAVE_GAS_HIDDEN
2953 for (node
= cgraph_nodes
; node
; node
= node
->next
)
2955 tree fndecl
= node
->decl
;
2957 if (TREE_ASM_WRITTEN (fndecl
)
2958 && DECL_CONTEXT (fndecl
)
2959 && TYPE_P (DECL_CONTEXT (fndecl
))
2960 && TYPE_FOR_JAVA (DECL_CONTEXT (fndecl
))
2961 && TARGET_USE_LOCAL_THUNK_ALIAS_P (fndecl
))
2963 /* Mangle the name in a predictable way; we need to reference
2964 this from a java compiled object file. */
2965 tree oid
, nid
, alias
;
2969 oid
= DECL_ASSEMBLER_NAME (fndecl
);
2970 oname
= IDENTIFIER_POINTER (oid
);
2971 gcc_assert (oname
[0] == '_' && oname
[1] == 'Z');
2972 nname
= ACONCAT (("_ZGA", oname
+2, NULL
));
2973 nid
= get_identifier (nname
);
2975 alias
= make_alias_for (fndecl
, nid
);
2976 TREE_PUBLIC (alias
) = 1;
2977 DECL_VISIBILITY (alias
) = VISIBILITY_HIDDEN
;
2979 assemble_alias (alias
, oid
);
2984 /* This routine is called at the end of compilation.
2985 Its job is to create all the code needed to initialize and
2986 destroy the global aggregates. We do the destruction
2987 first, since that way we only need to reverse the decls once. */
2990 cp_write_global_declarations (void)
2996 unsigned ssdf_count
= 0;
3000 locus
= input_location
;
3003 /* Bad parse errors. Just forget about it. */
3004 if (! global_bindings_p () || current_class_type
|| decl_namespace_list
)
3008 c_common_write_pch ();
3010 #ifdef USE_MAPPED_LOCATION
3013 /* Otherwise, GDB can get confused, because in only knows
3014 about source for LINENO-1 lines. */
3018 /* We now have to write out all the stuff we put off writing out.
3021 o Template specializations that we have not yet instantiated,
3022 but which are needed.
3023 o Initialization and destruction for non-local objects with
3024 static storage duration. (Local objects with static storage
3025 duration are initialized when their scope is first entered,
3026 and are cleaned up via atexit.)
3027 o Virtual function tables.
3029 All of these may cause others to be needed. For example,
3030 instantiating one function may cause another to be needed, and
3031 generating the initializer for an object may cause templates to be
3032 instantiated, etc., etc. */
3034 timevar_push (TV_VARCONST
);
3036 emit_support_tinfos ();
3045 /* If there are templates that we've put off instantiating, do
3047 instantiate_pending_templates (retries
);
3050 /* Write out virtual tables as required. Note that writing out
3051 the virtual table for a template class may cause the
3052 instantiation of members of that class. If we write out
3053 vtables then we remove the class from our list so we don't
3054 have to look at it again. */
3056 while (keyed_classes
!= NULL_TREE
3057 && maybe_emit_vtables (TREE_VALUE (keyed_classes
)))
3060 keyed_classes
= TREE_CHAIN (keyed_classes
);
3066 tree next
= TREE_CHAIN (t
);
3070 if (maybe_emit_vtables (TREE_VALUE (next
)))
3073 TREE_CHAIN (t
) = TREE_CHAIN (next
);
3078 next
= TREE_CHAIN (t
);
3082 /* Write out needed type info variables. We have to be careful
3083 looping through unemitted decls, because emit_tinfo_decl may
3084 cause other variables to be needed. New elements will be
3085 appended, and we remove from the vector those that actually
3087 for (i
= VEC_length (tree
, unemitted_tinfo_decls
);
3088 VEC_iterate (tree
, unemitted_tinfo_decls
, --i
, t
);)
3089 if (emit_tinfo_decl (t
))
3092 VEC_unordered_remove (tree
, unemitted_tinfo_decls
, i
);
3095 /* The list of objects with static storage duration is built up
3096 in reverse order. We clear STATIC_AGGREGATES so that any new
3097 aggregates added during the initialization of these will be
3098 initialized in the correct order when we next come around the
3100 vars
= prune_vars_needing_no_initialization (&static_aggregates
);
3104 /* We need to start a new initialization function each time
3105 through the loop. That's because we need to know which
3106 vtables have been referenced, and TREE_SYMBOL_REFERENCED
3107 isn't computed until a function is finished, and written
3108 out. That's a deficiency in the back end. When this is
3109 fixed, these initialization functions could all become
3110 inline, with resulting performance improvements. */
3113 /* Set the line and file, so that it is obviously not from
3115 input_location
= locus
;
3116 ssdf_body
= start_static_storage_duration_function (ssdf_count
);
3118 /* Make sure the back end knows about all the variables. */
3119 write_out_vars (vars
);
3121 /* First generate code to do all the initializations. */
3123 do_static_initialization_or_destruction (vars
, /*initp=*/true);
3125 /* Then, generate code to do all the destructions. Do these
3126 in reverse order so that the most recently constructed
3127 variable is the first destroyed. If we're using
3128 __cxa_atexit, then we don't need to do this; functions
3129 were registered at initialization time to destroy the
3131 if (!flag_use_cxa_atexit
&& vars
)
3133 vars
= nreverse (vars
);
3134 do_static_initialization_or_destruction (vars
, /*initp=*/false);
3139 /* Finish up the static storage duration function for this
3141 input_location
= locus
;
3142 finish_static_storage_duration_function (ssdf_body
);
3144 /* All those initializations and finalizations might cause
3145 us to need more inline functions, more template
3146 instantiations, etc. */
3149 #ifdef USE_MAPPED_LOCATION
3156 /* Go through the set of inline functions whose bodies have not
3157 been emitted yet. If out-of-line copies of these functions
3158 are required, emit them. */
3159 for (i
= 0; VEC_iterate (tree
, deferred_fns
, i
, decl
); ++i
)
3161 /* Does it need synthesizing? */
3162 if (DECL_ARTIFICIAL (decl
) && ! DECL_INITIAL (decl
)
3163 && (! DECL_REALLY_EXTERN (decl
) || DECL_INLINE (decl
)))
3165 /* Even though we're already at the top-level, we push
3166 there again. That way, when we pop back a few lines
3167 hence, all of our state is restored. Otherwise,
3168 finish_function doesn't clean things up, and we end
3169 up with CURRENT_FUNCTION_DECL set. */
3170 push_to_top_level ();
3171 /* The decl's location will mark where it was first
3172 needed. Save that so synthesize method can indicate
3173 where it was needed from, in case of error */
3174 input_location
= DECL_SOURCE_LOCATION (decl
);
3175 synthesize_method (decl
);
3176 pop_from_top_level ();
3180 if (!DECL_SAVED_TREE (decl
))
3183 /* We lie to the back end, pretending that some functions
3184 are not defined when they really are. This keeps these
3185 functions from being put out unnecessarily. But, we must
3186 stop lying when the functions are referenced, or if they
3187 are not comdat since they need to be put out now. If
3188 DECL_INTERFACE_KNOWN, then we have already set
3189 DECL_EXTERNAL appropriately, so there's no need to check
3190 again, and we do not want to clear DECL_EXTERNAL if a
3191 previous call to import_export_decl set it.
3193 This is done in a separate for cycle, because if some
3194 deferred function is contained in another deferred
3195 function later in deferred_fns varray,
3196 rest_of_compilation would skip this function and we
3197 really cannot expand the same function twice. */
3198 import_export_decl (decl
);
3199 if (DECL_NOT_REALLY_EXTERN (decl
)
3200 && DECL_INITIAL (decl
)
3201 && decl_needed_p (decl
))
3202 DECL_EXTERNAL (decl
) = 0;
3204 /* If we're going to need to write this function out, and
3205 there's already a body for it, create RTL for it now.
3206 (There might be no body if this is a method we haven't
3207 gotten around to synthesizing yet.) */
3208 if (!DECL_EXTERNAL (decl
)
3209 && decl_needed_p (decl
)
3210 && !TREE_ASM_WRITTEN (decl
)
3211 && !cgraph_node (decl
)->local
.finalized
)
3213 /* We will output the function; no longer consider it in this
3215 DECL_DEFER_OUTPUT (decl
) = 0;
3216 /* Generate RTL for this function now that we know we
3218 expand_or_defer_fn (decl
);
3219 /* If we're compiling -fsyntax-only pretend that this
3220 function has been written out so that we don't try to
3222 if (flag_syntax_only
)
3223 TREE_ASM_WRITTEN (decl
) = 1;
3228 if (walk_namespaces (wrapup_globals_for_namespace
, /*data=*/0))
3231 /* Static data members are just like namespace-scope globals. */
3232 for (i
= 0; VEC_iterate (tree
, pending_statics
, i
, decl
); ++i
)
3234 if (var_finalized_p (decl
) || DECL_REALLY_EXTERN (decl
))
3236 import_export_decl (decl
);
3237 /* If this static data member is needed, provide it to the
3239 if (DECL_NOT_REALLY_EXTERN (decl
) && decl_needed_p (decl
))
3240 DECL_EXTERNAL (decl
) = 0;
3242 if (VEC_length (tree
, pending_statics
) != 0
3243 && wrapup_global_declarations (VEC_address (tree
, pending_statics
),
3244 VEC_length (tree
, pending_statics
)))
3251 /* All used inline functions must have a definition at this point. */
3252 for (i
= 0; VEC_iterate (tree
, deferred_fns
, i
, decl
); ++i
)
3254 if (/* Check online inline functions that were actually used. */
3255 TREE_USED (decl
) && DECL_DECLARED_INLINE_P (decl
)
3256 /* If the definition actually was available here, then the
3257 fact that the function was not defined merely represents
3258 that for some reason (use of a template repository,
3259 #pragma interface, etc.) we decided not to emit the
3261 && !DECL_INITIAL (decl
)
3262 /* An explicit instantiation can be used to specify
3263 that the body is in another unit. It will have
3264 already verified there was a definition. */
3265 && !DECL_EXPLICIT_INSTANTIATION (decl
))
3267 warning (0, "inline function %q+D used but never defined", decl
);
3268 /* Avoid a duplicate warning from check_global_declaration_1. */
3269 TREE_NO_WARNING (decl
) = 1;
3273 /* We give C linkage to static constructors and destructors. */
3274 push_lang_context (lang_name_c
);
3276 /* Generate initialization and destruction functions for all
3277 priorities for which they are required. */
3278 if (priority_info_map
)
3279 splay_tree_foreach (priority_info_map
,
3280 generate_ctor_and_dtor_functions_for_priority
,
3282 else if (c_dialect_objc () && objc_static_init_needed_p ())
3283 /* If this is obj-c++ and we need a static init, call
3284 generate_ctor_or_dtor_function. */
3285 generate_ctor_or_dtor_function (/*constructor_p=*/true,
3286 DEFAULT_INIT_PRIORITY
, &locus
);
3288 /* We're done with the splay-tree now. */
3289 if (priority_info_map
)
3290 splay_tree_delete (priority_info_map
);
3292 c_build_cdtor_fns ();
3294 /* Generate any missing aliases. */
3295 maybe_apply_pending_pragma_weaks ();
3297 /* We're done with static constructors, so we can go back to "C++"
3299 pop_lang_context ();
3301 cgraph_finalize_compilation_unit ();
3304 /* Now, issue warnings about static, but not defined, functions,
3305 etc., and emit debugging information. */
3306 walk_namespaces (wrapup_globals_for_namespace
, /*data=*/&reconsider
);
3307 if (VEC_length (tree
, pending_statics
) != 0)
3309 check_global_declarations (VEC_address (tree
, pending_statics
),
3310 VEC_length (tree
, pending_statics
));
3311 emit_debug_global_declarations (VEC_address (tree
, pending_statics
),
3312 VEC_length (tree
, pending_statics
));
3315 /* Generate hidden aliases for Java. */
3316 build_java_method_aliases ();
3320 /* The entire file is now complete. If requested, dump everything
3324 FILE *stream
= dump_begin (TDI_tu
, &flags
);
3328 dump_node (global_namespace
, flags
& ~TDF_SLIM
, stream
);
3329 dump_end (TDI_tu
, stream
);
3333 timevar_pop (TV_VARCONST
);
3335 if (flag_detailed_statistics
)
3337 dump_tree_statistics ();
3338 dump_time_statistics ();
3340 input_location
= locus
;
3342 #ifdef ENABLE_CHECKING
3343 validate_conversion_obstack ();
3344 #endif /* ENABLE_CHECKING */
3347 /* FN is an OFFSET_REF, DOTSTAR_EXPR or MEMBER_REF indicating the
3348 function to call in parse-tree form; it has not yet been
3349 semantically analyzed. ARGS are the arguments to the function.
3350 They have already been semantically analyzed. */
3353 build_offset_ref_call_from_tree (tree fn
, tree args
)
3362 object
= TREE_OPERAND (fn
, 0);
3364 if (processing_template_decl
)
3366 gcc_assert (TREE_CODE (fn
) == DOTSTAR_EXPR
3367 || TREE_CODE (fn
) == MEMBER_REF
);
3368 if (type_dependent_expression_p (fn
)
3369 || any_type_dependent_arguments_p (args
))
3370 return build_nt_call_list (fn
, args
);
3372 /* Transform the arguments and add the implicit "this"
3373 parameter. That must be done before the FN is transformed
3374 because we depend on the form of FN. */
3375 args
= build_non_dependent_args (args
);
3376 if (TREE_CODE (fn
) == DOTSTAR_EXPR
)
3377 object
= build_unary_op (ADDR_EXPR
, object
, 0);
3378 object
= build_non_dependent_expr (object
);
3379 args
= tree_cons (NULL_TREE
, object
, args
);
3380 /* Now that the arguments are done, transform FN. */
3381 fn
= build_non_dependent_expr (fn
);
3384 /* A qualified name corresponding to a bound pointer-to-member is
3385 represented as an OFFSET_REF:
3387 struct B { void g(); };
3389 void B::g() { (this->*p)(); } */
3390 if (TREE_CODE (fn
) == OFFSET_REF
)
3392 tree object_addr
= build_unary_op (ADDR_EXPR
, object
, 0);
3393 fn
= TREE_OPERAND (fn
, 1);
3394 fn
= get_member_function_from_ptrfunc (&object_addr
, fn
);
3395 args
= tree_cons (NULL_TREE
, object_addr
, args
);
3398 expr
= build_function_call (fn
, args
);
3399 if (processing_template_decl
&& expr
!= error_mark_node
)
3400 return build_min_non_dep_call_list (expr
, orig_fn
, orig_args
);
3406 check_default_args (tree x
)
3408 tree arg
= TYPE_ARG_TYPES (TREE_TYPE (x
));
3409 bool saw_def
= false;
3410 int i
= 0 - (TREE_CODE (TREE_TYPE (x
)) == METHOD_TYPE
);
3411 for (; arg
&& arg
!= void_list_node
; arg
= TREE_CHAIN (arg
), ++i
)
3413 if (TREE_PURPOSE (arg
))
3417 error ("default argument missing for parameter %P of %q+#D", i
, x
);
3418 TREE_PURPOSE (arg
) = error_mark_node
;
3423 /* Mark DECL (either a _DECL or a BASELINK) as "used" in the program.
3424 If DECL is a specialization or implicitly declared class member,
3425 generate the actual definition. */
3428 mark_used (tree decl
)
3430 HOST_WIDE_INT saved_processing_template_decl
= 0;
3432 /* If DECL is a BASELINK for a single function, then treat it just
3433 like the DECL for the function. Otherwise, if the BASELINK is
3434 for an overloaded function, we don't know which function was
3435 actually used until after overload resolution. */
3436 if (TREE_CODE (decl
) == BASELINK
)
3438 decl
= BASELINK_FUNCTIONS (decl
);
3439 if (really_overloaded_fn (decl
))
3441 decl
= OVL_CURRENT (decl
);
3444 TREE_USED (decl
) = 1;
3445 if (DECL_CLONED_FUNCTION_P (decl
))
3446 TREE_USED (DECL_CLONED_FUNCTION (decl
)) = 1;
3447 /* If we don't need a value, then we don't need to synthesize DECL. */
3448 if (skip_evaluation
)
3450 /* Normally, we can wait until instantiation-time to synthesize
3451 DECL. However, if DECL is a static data member initialized with
3452 a constant, we need the value right now because a reference to
3453 such a data member is not value-dependent. */
3454 if (TREE_CODE (decl
) == VAR_DECL
3455 && DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl
)
3456 && DECL_CLASS_SCOPE_P (decl
))
3458 /* Don't try to instantiate members of dependent types. We
3459 cannot just use dependent_type_p here because this function
3460 may be called from fold_non_dependent_expr, and then we may
3461 see dependent types, even though processing_template_decl
3463 if (CLASSTYPE_TEMPLATE_INFO ((DECL_CONTEXT (decl
)))
3464 && uses_template_parms (CLASSTYPE_TI_ARGS (DECL_CONTEXT (decl
))))
3466 /* Pretend that we are not in a template, even if we are, so
3467 that the static data member initializer will be processed. */
3468 saved_processing_template_decl
= processing_template_decl
;
3469 processing_template_decl
= 0;
3472 if (processing_template_decl
)
3475 if (TREE_CODE (decl
) == FUNCTION_DECL
&& DECL_DECLARED_INLINE_P (decl
)
3476 && !TREE_ASM_WRITTEN (decl
))
3477 /* Remember it, so we can check it was defined. */
3479 if (DECL_DEFERRED_FN (decl
))
3482 /* Remember the current location for a function we will end up
3483 synthesizing. Then we can inform the user where it was
3484 required in the case of error. */
3485 if (DECL_ARTIFICIAL (decl
) && DECL_NONSTATIC_MEMBER_FUNCTION_P (decl
)
3486 && !DECL_THUNK_P (decl
))
3487 DECL_SOURCE_LOCATION (decl
) = input_location
;
3489 note_vague_linkage_fn (decl
);
3492 assemble_external (decl
);
3494 /* Is it a synthesized method that needs to be synthesized? */
3495 if (TREE_CODE (decl
) == FUNCTION_DECL
3496 && DECL_NONSTATIC_MEMBER_FUNCTION_P (decl
)
3497 && DECL_ARTIFICIAL (decl
)
3498 && !DECL_THUNK_P (decl
)
3499 && ! DECL_INITIAL (decl
)
3500 /* Kludge: don't synthesize for default args. Unfortunately this
3501 rules out initializers of namespace-scoped objects too, but
3502 it's sort-of ok if the implicit ctor or dtor decl keeps
3503 pointing to the class location. */
3504 && current_function_decl
)
3506 synthesize_method (decl
);
3507 /* If we've already synthesized the method we don't need to
3508 do the instantiation test below. */
3510 else if ((DECL_NON_THUNK_FUNCTION_P (decl
) || TREE_CODE (decl
) == VAR_DECL
)
3511 && DECL_LANG_SPECIFIC (decl
) && DECL_TEMPLATE_INFO (decl
)
3512 && (!DECL_EXPLICIT_INSTANTIATION (decl
)
3513 || (TREE_CODE (decl
) == FUNCTION_DECL
3514 && DECL_INLINE (DECL_TEMPLATE_RESULT
3515 (template_for_substitution (decl
))))
3516 /* We need to instantiate static data members so that there
3517 initializers are available in integral constant
3519 || (TREE_CODE (decl
) == VAR_DECL
3520 && DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl
))))
3521 /* If this is a function or variable that is an instance of some
3522 template, we now know that we will need to actually do the
3523 instantiation. We check that DECL is not an explicit
3524 instantiation because that is not checked in instantiate_decl.
3526 We put off instantiating functions in order to improve compile
3527 times. Maintaining a stack of active functions is expensive,
3528 and the inliner knows to instantiate any functions it might
3529 need. Therefore, we always try to defer instantiation. */
3530 instantiate_decl (decl
, /*defer_ok=*/true,
3531 /*expl_inst_class_mem_p=*/false);
3533 processing_template_decl
= saved_processing_template_decl
;
3536 #include "gt-cp-decl2.h"