1 /* Process declarations and variables for C++ compiler.
2 Copyright (C) 1988, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
3 1999, 2000, 2001, 2002, 2003, 2004, 2005 Free Software Foundation, Inc.
4 Hacked by Michael Tiemann (tiemann@cygnus.com)
6 This file is part of GCC.
8 GCC is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2, or (at your option)
13 GCC is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with GCC; see the file COPYING. If not, write to
20 the Free Software Foundation, 51 Franklin Street, Fifth Floor,
21 Boston, MA 02110-1301, USA. */
24 /* Process declarations and symbol lookup for C++ front end.
25 Also constructs types; the standard scalar types at initialization,
26 and structure, union, array and enum types when they are declared. */
28 /* ??? not all decl nodes are given the most useful possible
29 line numbers. For example, the CONST_DECLs for enum values. */
33 #include "coretypes.h"
48 #include "tree-mudflap.h"
50 #include "tree-inline.h"
52 #include "tree-dump.h"
55 extern cpp_reader *parse_in;
57 /* This structure contains information about the initializations
58 and/or destructions required for a particular priority level. */
59 typedef struct priority_info_s {
60 /* Nonzero if there have been any initializations at this priority
61 throughout the translation unit. */
62 int initializations_p;
63 /* Nonzero if there have been any destructions at this priority
64 throughout the translation unit. */
68 static void mark_vtable_entries (tree);
69 static bool maybe_emit_vtables (tree);
70 static bool acceptable_java_type (tree);
71 static tree start_objects (int, int);
72 static void finish_objects (int, int, tree);
73 static tree start_static_storage_duration_function (unsigned);
74 static void finish_static_storage_duration_function (tree);
75 static priority_info get_priority_info (int);
76 static void do_static_initialization_or_destruction (tree, bool);
77 static void one_static_initialization_or_destruction (tree, tree, bool);
78 static void generate_ctor_or_dtor_function (bool, int, location_t *);
79 static int generate_ctor_and_dtor_functions_for_priority (splay_tree_node,
81 static tree prune_vars_needing_no_initialization (tree *);
82 static void write_out_vars (tree);
83 static void import_export_class (tree);
84 static tree get_guard_bits (tree);
85 static void determine_visibility_from_class (tree, tree);
87 /* A list of static class variables. This is needed, because a
88 static class variable can be declared inside the class without
89 an initializer, and then initialized, statically, outside the class. */
90 static GTY(()) VEC(tree,gc) *pending_statics;
92 /* A list of functions which were declared inline, but which we
93 may need to emit outline anyway. */
94 static GTY(()) VEC(tree,gc) *deferred_fns;
96 /* Nonzero if we're done parsing and into end-of-file activities. */
100 /* Functions called along with real static constructors and destructors. */
107 /* Return a member function type (a METHOD_TYPE), given FNTYPE (a
108 FUNCTION_TYPE), CTYPE (class type), and QUALS (the cv-qualifiers
109 that apply to the function). */
112 build_memfn_type (tree fntype, tree ctype, cp_cv_quals quals)
117 if (fntype == error_mark_node || ctype == error_mark_node)
118 return error_mark_node;
120 type_quals = quals & ~TYPE_QUAL_RESTRICT;
121 ctype = cp_build_qualified_type (ctype, type_quals);
122 fntype = build_method_type_directly (ctype, TREE_TYPE (fntype),
123 (TREE_CODE (fntype) == METHOD_TYPE
124 ? TREE_CHAIN (TYPE_ARG_TYPES (fntype))
125 : TYPE_ARG_TYPES (fntype)));
126 raises = TYPE_RAISES_EXCEPTIONS (fntype);
128 fntype = build_exception_variant (fntype, raises);
133 /* Build a PARM_DECL with NAME and TYPE, and set DECL_ARG_TYPE
137 cp_build_parm_decl (tree name, tree type)
139 tree parm = build_decl (PARM_DECL, name, type);
140 /* DECL_ARG_TYPE is only used by the back end and the back end never
142 if (!processing_template_decl)
143 DECL_ARG_TYPE (parm) = type_passed_as (type);
147 /* Returns a PARM_DECL for a parameter of the indicated TYPE, with the
151 build_artificial_parm (tree name, tree type)
153 tree parm = cp_build_parm_decl (name, type);
154 DECL_ARTIFICIAL (parm) = 1;
155 /* All our artificial parms are implicitly `const'; they cannot be
157 TREE_READONLY (parm) = 1;
161 /* Constructors for types with virtual baseclasses need an "in-charge" flag
162 saying whether this constructor is responsible for initialization of
163 virtual baseclasses or not. All destructors also need this "in-charge"
164 flag, which additionally determines whether or not the destructor should
165 free the memory for the object.
167 This function adds the "in-charge" flag to member function FN if
168 appropriate. It is called from grokclassfn and tsubst.
169 FN must be either a constructor or destructor.
171 The in-charge flag follows the 'this' parameter, and is followed by the
172 VTT parm (if any), then the user-written parms. */
175 maybe_retrofit_in_chrg (tree fn)
177 tree basetype, arg_types, parms, parm, fntype;
179 /* If we've already add the in-charge parameter don't do it again. */
180 if (DECL_HAS_IN_CHARGE_PARM_P (fn))
183 /* When processing templates we can't know, in general, whether or
184 not we're going to have virtual baseclasses. */
185 if (processing_template_decl)
188 /* We don't need an in-charge parameter for constructors that don't
189 have virtual bases. */
190 if (DECL_CONSTRUCTOR_P (fn)
191 && !CLASSTYPE_VBASECLASSES (DECL_CONTEXT (fn)))
194 arg_types = TYPE_ARG_TYPES (TREE_TYPE (fn));
195 basetype = TREE_TYPE (TREE_VALUE (arg_types));
196 arg_types = TREE_CHAIN (arg_types);
198 parms = TREE_CHAIN (DECL_ARGUMENTS (fn));
200 /* If this is a subobject constructor or destructor, our caller will
201 pass us a pointer to our VTT. */
202 if (CLASSTYPE_VBASECLASSES (DECL_CONTEXT (fn)))
204 parm = build_artificial_parm (vtt_parm_identifier, vtt_parm_type);
206 /* First add it to DECL_ARGUMENTS between 'this' and the real args... */
207 TREE_CHAIN (parm) = parms;
210 /* ...and then to TYPE_ARG_TYPES. */
211 arg_types = hash_tree_chain (vtt_parm_type, arg_types);
213 DECL_HAS_VTT_PARM_P (fn) = 1;
216 /* Then add the in-charge parm (before the VTT parm). */
217 parm = build_artificial_parm (in_charge_identifier, integer_type_node);
218 TREE_CHAIN (parm) = parms;
220 arg_types = hash_tree_chain (integer_type_node, arg_types);
222 /* Insert our new parameter(s) into the list. */
223 TREE_CHAIN (DECL_ARGUMENTS (fn)) = parms;
225 /* And rebuild the function type. */
226 fntype = build_method_type_directly (basetype, TREE_TYPE (TREE_TYPE (fn)),
228 if (TYPE_RAISES_EXCEPTIONS (TREE_TYPE (fn)))
229 fntype = build_exception_variant (fntype,
230 TYPE_RAISES_EXCEPTIONS (TREE_TYPE (fn)));
231 TREE_TYPE (fn) = fntype;
233 /* Now we've got the in-charge parameter. */
234 DECL_HAS_IN_CHARGE_PARM_P (fn) = 1;
237 /* Classes overload their constituent function names automatically.
238 When a function name is declared in a record structure,
239 its name is changed to it overloaded name. Since names for
240 constructors and destructors can conflict, we place a leading
243 CNAME is the name of the class we are grokking for.
245 FUNCTION is a FUNCTION_DECL. It was created by `grokdeclarator'.
247 FLAGS contains bits saying what's special about today's
248 arguments. 1 == DESTRUCTOR. 2 == OPERATOR.
250 If FUNCTION is a destructor, then we must add the `auto-delete' field
251 as a second parameter. There is some hair associated with the fact
252 that we must "declare" this variable in the manner consistent with the
253 way the rest of the arguments were declared.
255 QUALS are the qualifiers for the this pointer. */
258 grokclassfn (tree ctype, tree function, enum overload_flags flags)
260 tree fn_name = DECL_NAME (function);
262 /* Even within an `extern "C"' block, members get C++ linkage. See
263 [dcl.link] for details. */
264 SET_DECL_LANGUAGE (function, lang_cplusplus);
266 if (fn_name == NULL_TREE)
268 error ("name missing for member function");
269 fn_name = get_identifier ("<anonymous>");
270 DECL_NAME (function) = fn_name;
273 DECL_CONTEXT (function) = ctype;
275 if (flags == DTOR_FLAG)
276 DECL_DESTRUCTOR_P (function) = 1;
278 if (flags == DTOR_FLAG || DECL_CONSTRUCTOR_P (function))
279 maybe_retrofit_in_chrg (function);
282 /* Create an ARRAY_REF, checking for the user doing things backwards
286 grok_array_decl (tree array_expr, tree index_exp)
290 tree orig_array_expr = array_expr;
291 tree orig_index_exp = index_exp;
293 if (error_operand_p (array_expr) || error_operand_p (index_exp))
294 return error_mark_node;
296 if (processing_template_decl)
298 if (type_dependent_expression_p (array_expr)
299 || type_dependent_expression_p (index_exp))
300 return build_min_nt (ARRAY_REF, array_expr, index_exp,
301 NULL_TREE, NULL_TREE);
302 array_expr = build_non_dependent_expr (array_expr);
303 index_exp = build_non_dependent_expr (index_exp);
306 type = TREE_TYPE (array_expr);
308 type = non_reference (type);
310 /* If they have an `operator[]', use that. */
311 if (IS_AGGR_TYPE (type) || IS_AGGR_TYPE (TREE_TYPE (index_exp)))
312 expr = build_new_op (ARRAY_REF, LOOKUP_NORMAL,
313 array_expr, index_exp, NULL_TREE,
314 /*overloaded_p=*/NULL);
319 /* Otherwise, create an ARRAY_REF for a pointer or array type.
320 It is a little-known fact that, if `a' is an array and `i' is
321 an int, you can write `i[a]', which means the same thing as
323 if (TREE_CODE (type) == ARRAY_TYPE)
326 p1 = build_expr_type_conversion (WANT_POINTER, array_expr, false);
328 if (TREE_CODE (TREE_TYPE (index_exp)) == ARRAY_TYPE)
331 p2 = build_expr_type_conversion (WANT_POINTER, index_exp, false);
333 i1 = build_expr_type_conversion (WANT_INT | WANT_ENUM, array_expr,
335 i2 = build_expr_type_conversion (WANT_INT | WANT_ENUM, index_exp,
338 if ((p1 && i2) && (i1 && p2))
339 error ("ambiguous conversion for array subscript");
342 array_expr = p1, index_exp = i2;
344 array_expr = p2, index_exp = i1;
347 error ("invalid types %<%T[%T]%> for array subscript",
348 type, TREE_TYPE (index_exp));
349 return error_mark_node;
352 if (array_expr == error_mark_node || index_exp == error_mark_node)
353 error ("ambiguous conversion for array subscript");
355 expr = build_array_ref (array_expr, index_exp);
357 if (processing_template_decl && expr != error_mark_node)
358 return build_min_non_dep (ARRAY_REF, expr, orig_array_expr, orig_index_exp,
359 NULL_TREE, NULL_TREE);
363 /* Given the cast expression EXP, checking out its validity. Either return
364 an error_mark_node if there was an unavoidable error, return a cast to
365 void for trying to delete a pointer w/ the value 0, or return the
366 call to delete. If DOING_VEC is true, we handle things differently
367 for doing an array delete.
368 Implements ARM $5.3.4. This is called from the parser. */
371 delete_sanity (tree exp, tree size, bool doing_vec, int use_global_delete)
375 if (exp == error_mark_node)
378 if (processing_template_decl)
380 t = build_min (DELETE_EXPR, void_type_node, exp, size);
381 DELETE_EXPR_USE_GLOBAL (t) = use_global_delete;
382 DELETE_EXPR_USE_VEC (t) = doing_vec;
383 TREE_SIDE_EFFECTS (t) = 1;
387 /* An array can't have been allocated by new, so complain. */
388 if (TREE_CODE (exp) == VAR_DECL
389 && TREE_CODE (TREE_TYPE (exp)) == ARRAY_TYPE)
390 warning (0, "deleting array %q#D", exp);
392 t = build_expr_type_conversion (WANT_POINTER, exp, true);
394 if (t == NULL_TREE || t == error_mark_node)
396 error ("type %q#T argument given to %<delete%>, expected pointer",
398 return error_mark_node;
401 type = TREE_TYPE (t);
403 /* As of Valley Forge, you can delete a pointer to const. */
405 /* You can't delete functions. */
406 if (TREE_CODE (TREE_TYPE (type)) == FUNCTION_TYPE)
408 error ("cannot delete a function. Only pointer-to-objects are "
409 "valid arguments to %<delete%>");
410 return error_mark_node;
413 /* Deleting ptr to void is undefined behavior [expr.delete/3]. */
414 if (TREE_CODE (TREE_TYPE (type)) == VOID_TYPE)
416 warning (0, "deleting %qT is undefined", type);
420 /* Deleting a pointer with the value zero is valid and has no effect. */
421 if (integer_zerop (t))
422 return build1 (NOP_EXPR, void_type_node, t);
425 return build_vec_delete (t, /*maxindex=*/NULL_TREE,
426 sfk_deleting_destructor,
429 return build_delete (type, t, sfk_deleting_destructor,
430 LOOKUP_NORMAL, use_global_delete);
433 /* Report an error if the indicated template declaration is not the
434 sort of thing that should be a member template. */
437 check_member_template (tree tmpl)
441 gcc_assert (TREE_CODE (tmpl) == TEMPLATE_DECL);
442 decl = DECL_TEMPLATE_RESULT (tmpl);
444 if (TREE_CODE (decl) == FUNCTION_DECL
445 || (TREE_CODE (decl) == TYPE_DECL
446 && IS_AGGR_TYPE (TREE_TYPE (decl))))
448 if (current_function_decl)
449 /* 14.5.2.2 [temp.mem]
451 A local class shall not have member templates. */
452 error ("invalid declaration of member template %q#D in local class",
455 /* The parser rejects any use of virtual in a function template. */
456 gcc_assert (!(TREE_CODE (decl) == FUNCTION_DECL
457 && DECL_VIRTUAL_P (decl)));
459 /* The debug-information generating code doesn't know what to do
460 with member templates. */
461 DECL_IGNORED_P (tmpl) = 1;
464 error ("template declaration of %q#D", decl);
467 /* Return true iff TYPE is a valid Java parameter or return type. */
470 acceptable_java_type (tree type)
472 if (type == error_mark_node)
475 if (TREE_CODE (type) == VOID_TYPE || TYPE_FOR_JAVA (type))
477 if (TREE_CODE (type) == POINTER_TYPE || TREE_CODE (type) == REFERENCE_TYPE)
479 type = TREE_TYPE (type);
480 if (TREE_CODE (type) == RECORD_TYPE)
483 if (! TYPE_FOR_JAVA (type))
485 if (! CLASSTYPE_TEMPLATE_INFO (type))
487 args = CLASSTYPE_TI_ARGS (type);
488 i = TREE_VEC_LENGTH (args);
491 type = TREE_VEC_ELT (args, i);
492 if (TREE_CODE (type) == POINTER_TYPE)
493 type = TREE_TYPE (type);
494 if (! TYPE_FOR_JAVA (type))
503 /* For a METHOD in a Java class CTYPE, return true if
504 the parameter and return types are valid Java types.
505 Otherwise, print appropriate error messages, and return false. */
508 check_java_method (tree method)
511 tree arg_types = TYPE_ARG_TYPES (TREE_TYPE (method));
512 tree ret_type = TREE_TYPE (TREE_TYPE (method));
514 if (!acceptable_java_type (ret_type))
516 error ("Java method %qD has non-Java return type %qT",
521 arg_types = TREE_CHAIN (arg_types);
522 if (DECL_HAS_IN_CHARGE_PARM_P (method))
523 arg_types = TREE_CHAIN (arg_types);
524 if (DECL_HAS_VTT_PARM_P (method))
525 arg_types = TREE_CHAIN (arg_types);
527 for (; arg_types != NULL_TREE; arg_types = TREE_CHAIN (arg_types))
529 tree type = TREE_VALUE (arg_types);
530 if (!acceptable_java_type (type))
532 if (type != error_mark_node)
533 error ("Java method %qD has non-Java parameter type %qT",
541 /* Sanity check: report error if this function FUNCTION is not
542 really a member of the class (CTYPE) it is supposed to belong to.
543 TEMPLATE_PARMS is used to specify the template parameters of a member
544 template passed as FUNCTION_DECL. If the member template is passed as a
545 TEMPLATE_DECL, it can be NULL since the parameters can be extracted
546 from the declaration. If the function is not a function template, it
548 It returns the original declaration for the function, or NULL_TREE
549 if no declaration was found (and an error was emitted). */
552 check_classfn (tree ctype, tree function, tree template_parms)
557 if (DECL_USE_TEMPLATE (function)
558 && !(TREE_CODE (function) == TEMPLATE_DECL
559 && DECL_TEMPLATE_SPECIALIZATION (function))
560 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (function)))
561 /* Since this is a specialization of a member template,
562 we're not going to find the declaration in the class.
565 struct S { template <typename T> void f(T); };
566 template <> void S::f(int);
568 we're not going to find `S::f(int)', but there's no
569 reason we should, either. We let our callers know we didn't
570 find the method, but we don't complain. */
573 /* Basic sanity check: for a template function, the template parameters
574 either were not passed, or they are the same of DECL_TEMPLATE_PARMS. */
575 if (TREE_CODE (function) == TEMPLATE_DECL)
577 gcc_assert (!template_parms
578 || comp_template_parms (template_parms,
579 DECL_TEMPLATE_PARMS (function)));
580 template_parms = DECL_TEMPLATE_PARMS (function);
583 /* OK, is this a definition of a member template? */
584 is_template = (template_parms != NULL_TREE);
586 ix = class_method_index_for_fn (complete_type (ctype), function);
589 VEC(tree,gc) *methods = CLASSTYPE_METHOD_VEC (ctype);
590 tree fndecls, fndecl = 0;
593 const char *format = NULL;
595 pushed_scope = push_scope (ctype);
596 for (fndecls = VEC_index (tree, methods, ix);
597 fndecls; fndecls = OVL_NEXT (fndecls))
601 fndecl = OVL_CURRENT (fndecls);
602 p1 = TYPE_ARG_TYPES (TREE_TYPE (function));
603 p2 = TYPE_ARG_TYPES (TREE_TYPE (fndecl));
605 /* We cannot simply call decls_match because this doesn't
606 work for static member functions that are pretending to
607 be methods, and because the name may have been changed by
610 /* Get rid of the this parameter on functions that become
612 if (DECL_STATIC_FUNCTION_P (fndecl)
613 && TREE_CODE (TREE_TYPE (function)) == METHOD_TYPE)
614 p1 = TREE_CHAIN (p1);
616 /* A member template definition only matches a member template
618 if (is_template != (TREE_CODE (fndecl) == TEMPLATE_DECL))
621 if (same_type_p (TREE_TYPE (TREE_TYPE (function)),
622 TREE_TYPE (TREE_TYPE (fndecl)))
623 && compparms (p1, p2)
625 || comp_template_parms (template_parms,
626 DECL_TEMPLATE_PARMS (fndecl)))
627 && (DECL_TEMPLATE_SPECIALIZATION (function)
628 == DECL_TEMPLATE_SPECIALIZATION (fndecl))
629 && (!DECL_TEMPLATE_SPECIALIZATION (function)
630 || (DECL_TI_TEMPLATE (function)
631 == DECL_TI_TEMPLATE (fndecl))))
635 pop_scope (pushed_scope);
637 return OVL_CURRENT (fndecls);
638 error ("prototype for %q#D does not match any in class %qT",
640 is_conv_op = DECL_CONV_FN_P (fndecl);
643 ix = CLASSTYPE_FIRST_CONVERSION_SLOT;
644 fndecls = VEC_index (tree, methods, ix);
647 fndecl = OVL_CURRENT (fndecls);
648 fndecls = OVL_NEXT (fndecls);
650 if (!fndecls && is_conv_op)
652 if (VEC_length (tree, methods) > (size_t) ++ix)
654 fndecls = VEC_index (tree, methods, ix);
655 if (!DECL_CONV_FN_P (OVL_CURRENT (fndecls)))
667 format = N_("candidates are: %+#D");
669 format = N_("candidate is: %+#D");
670 error (format, fndecl);
673 else if (!COMPLETE_TYPE_P (ctype))
674 cxx_incomplete_type_error (function, ctype);
676 error ("no %q#D member function declared in class %qT",
679 /* If we did not find the method in the class, add it to avoid
680 spurious errors (unless the CTYPE is not yet defined, in which
681 case we'll only confuse ourselves when the function is declared
682 properly within the class. */
683 if (COMPLETE_TYPE_P (ctype))
684 add_method (ctype, function, NULL_TREE);
688 /* DECL is a function with vague linkage. Remember it so that at the
689 end of the translation unit we can decide whether or not to emit
693 note_vague_linkage_fn (tree decl)
695 if (!DECL_DEFERRED_FN (decl))
697 DECL_DEFERRED_FN (decl) = 1;
698 DECL_DEFER_OUTPUT (decl) = 1;
699 VEC_safe_push (tree, gc, deferred_fns, decl);
703 /* We have just processed the DECL, which is a static data member.
704 The other parameters are as for cp_finish_decl. */
707 finish_static_data_member_decl (tree decl,
708 tree init, bool init_const_expr_p,
712 DECL_CONTEXT (decl) = current_class_type;
714 /* We cannot call pushdecl here, because that would fill in the
715 TREE_CHAIN of our decl. Instead, we modify cp_finish_decl to do
716 the right thing, namely, to put this decl out straight away. */
718 if (! processing_template_decl)
719 VEC_safe_push (tree, gc, pending_statics, decl);
721 if (LOCAL_CLASS_P (current_class_type))
722 pedwarn ("local class %q#T shall not have static data member %q#D",
723 current_class_type, decl);
725 /* Static consts need not be initialized in the class definition. */
726 if (init != NULL_TREE && TYPE_NEEDS_CONSTRUCTING (TREE_TYPE (decl)))
728 static int explained = 0;
730 error ("initializer invalid for static member with constructor");
733 error ("(an out of class initialization is required)");
738 /* Force the compiler to know when an uninitialized static const
739 member is being used. */
740 if (CP_TYPE_CONST_P (TREE_TYPE (decl)) && init == 0)
741 TREE_USED (decl) = 1;
742 DECL_INITIAL (decl) = init;
743 DECL_IN_AGGR_P (decl) = 1;
745 cp_finish_decl (decl, init, init_const_expr_p, asmspec_tree, flags);
748 /* DECLARATOR and DECLSPECS correspond to a class member. The other
749 parameters are as for cp_finish_decl. Return the DECL for the
750 class member declared. */
753 grokfield (const cp_declarator *declarator,
754 cp_decl_specifier_seq *declspecs,
755 tree init, bool init_const_expr_p,
760 const char *asmspec = 0;
761 int flags = LOOKUP_ONLYCONVERTING;
763 if (!declspecs->any_specifiers_p
764 && declarator->kind == cdk_id
765 && declarator->u.id.qualifying_scope
766 && TYPE_P (declarator->u.id.qualifying_scope)
767 && IS_AGGR_TYPE (declarator->u.id.qualifying_scope)
768 && TREE_CODE (declarator->u.id.unqualified_name) == IDENTIFIER_NODE)
769 /* Access declaration */
770 return do_class_using_decl (declarator->u.id.qualifying_scope,
771 declarator->u.id.unqualified_name);
774 && TREE_CODE (init) == TREE_LIST
775 && TREE_VALUE (init) == error_mark_node
776 && TREE_CHAIN (init) == NULL_TREE)
779 value = grokdeclarator (declarator, declspecs, FIELD, init != 0, &attrlist);
780 if (! value || error_operand_p (value))
781 /* friend or constructor went bad. */
782 return error_mark_node;
784 if (TREE_CODE (value) == TYPE_DECL && init)
786 error ("typedef %qD is initialized (use __typeof__ instead)", value);
790 /* Pass friendly classes back. */
791 if (value == void_type_node)
794 /* Pass friend decls back. */
795 if ((TREE_CODE (value) == FUNCTION_DECL
796 || TREE_CODE (value) == TEMPLATE_DECL)
797 && DECL_CONTEXT (value) != current_class_type)
800 if (DECL_NAME (value) != NULL_TREE
801 && IDENTIFIER_POINTER (DECL_NAME (value))[0] == '_'
802 && ! strcmp (IDENTIFIER_POINTER (DECL_NAME (value)), "_vptr"))
803 error ("member %qD conflicts with virtual function table field name",
806 /* Stash away type declarations. */
807 if (TREE_CODE (value) == TYPE_DECL)
809 DECL_NONLOCAL (value) = 1;
810 DECL_CONTEXT (value) = current_class_type;
812 if (processing_template_decl)
813 value = push_template_decl (value);
817 /* Avoid storing attributes in template parameters:
818 tsubst is not ready to handle them. */
819 tree type = TREE_TYPE (value);
820 if (TREE_CODE (type) == TEMPLATE_TYPE_PARM
821 || TREE_CODE (type) == BOUND_TEMPLATE_TEMPLATE_PARM)
822 sorry ("applying attributes to template parameters is not implemented");
824 cplus_decl_attributes (&value, attrlist, 0);
830 if (DECL_IN_AGGR_P (value))
832 error ("%qD is already defined in %qT", value, DECL_CONTEXT (value));
833 return void_type_node;
836 if (asmspec_tree && asmspec_tree != error_mark_node)
837 asmspec = TREE_STRING_POINTER (asmspec_tree);
841 if (TREE_CODE (value) == FUNCTION_DECL)
843 /* Initializers for functions are rejected early in the parser.
844 If we get here, it must be a pure specifier for a method. */
845 if (TREE_CODE (TREE_TYPE (value)) == METHOD_TYPE)
847 gcc_assert (error_operand_p (init) || integer_zerop (init));
848 DECL_PURE_VIRTUAL_P (value) = 1;
852 gcc_assert (TREE_CODE (TREE_TYPE (value)) == FUNCTION_TYPE);
853 error ("initializer specified for static member function %qD",
857 else if (pedantic && TREE_CODE (value) != VAR_DECL)
858 /* Already complained in grokdeclarator. */
860 else if (!processing_template_decl)
862 if (TREE_CODE (init) == CONSTRUCTOR)
863 init = digest_init (TREE_TYPE (value), init);
865 init = integral_constant_value (init);
867 if (init != error_mark_node && !TREE_CONSTANT (init))
869 /* We can allow references to things that are effectively
870 static, since references are initialized with the
872 if (TREE_CODE (TREE_TYPE (value)) != REFERENCE_TYPE
873 || (TREE_STATIC (init) == 0
874 && (!DECL_P (init) || DECL_EXTERNAL (init) == 0)))
876 error ("field initializer is not constant");
877 init = error_mark_node;
883 if (processing_template_decl
884 && (TREE_CODE (value) == VAR_DECL || TREE_CODE (value) == FUNCTION_DECL))
886 value = push_template_decl (value);
887 if (error_operand_p (value))
888 return error_mark_node;
892 cplus_decl_attributes (&value, attrlist, 0);
894 switch (TREE_CODE (value))
897 finish_static_data_member_decl (value, init, init_const_expr_p,
898 asmspec_tree, flags);
903 error ("%<asm%> specifiers are not permitted on non-static data members");
904 if (DECL_INITIAL (value) == error_mark_node)
905 init = error_mark_node;
906 cp_finish_decl (value, init, /*init_const_expr_p=*/false,
908 DECL_INITIAL (value) = init;
909 DECL_IN_AGGR_P (value) = 1;
914 set_user_assembler_name (value, asmspec);
916 cp_finish_decl (value,
918 /*init_const_expr_p=*/false,
919 asmspec_tree, flags);
921 /* Pass friends back this way. */
922 if (DECL_FRIEND_P (value))
923 return void_type_node;
925 DECL_IN_AGGR_P (value) = 1;
934 /* Like `grokfield', but for bitfields.
935 WIDTH is non-NULL for bit fields only, and is an INTEGER_CST node. */
938 grokbitfield (const cp_declarator *declarator,
939 cp_decl_specifier_seq *declspecs, tree width)
941 tree value = grokdeclarator (declarator, declspecs, BITFIELD, 0, NULL);
943 if (value == error_mark_node)
944 return NULL_TREE; /* friends went bad. */
946 /* Pass friendly classes back. */
947 if (TREE_CODE (value) == VOID_TYPE)
948 return void_type_node;
950 if (TREE_CODE (value) == TYPE_DECL)
952 error ("cannot declare %qD to be a bit-field type", value);
956 /* Usually, finish_struct_1 catches bitfields with invalid types.
957 But, in the case of bitfields with function type, we confuse
958 ourselves into thinking they are member functions, so we must
960 if (TREE_CODE (value) == FUNCTION_DECL)
962 error ("cannot declare bit-field %qD with function type",
967 if (DECL_IN_AGGR_P (value))
969 error ("%qD is already defined in the class %qT", value,
970 DECL_CONTEXT (value));
971 return void_type_node;
974 if (TREE_STATIC (value))
976 error ("static member %qD cannot be a bit-field", value);
979 finish_decl (value, NULL_TREE, NULL_TREE);
981 if (width != error_mark_node)
983 constant_expression_warning (width);
984 DECL_INITIAL (value) = width;
985 SET_DECL_C_BIT_FIELD (value);
988 DECL_IN_AGGR_P (value) = 1;
994 cplus_decl_attributes (tree *decl, tree attributes, int flags)
996 if (*decl == NULL_TREE || *decl == void_type_node
997 || *decl == error_mark_node)
1000 if (TREE_CODE (*decl) == TEMPLATE_DECL)
1001 decl = &DECL_TEMPLATE_RESULT (*decl);
1003 decl_attributes (decl, attributes, flags);
1005 if (TREE_CODE (*decl) == TYPE_DECL)
1006 SET_IDENTIFIER_TYPE_VALUE (DECL_NAME (*decl), TREE_TYPE (*decl));
1009 /* Walks through the namespace- or function-scope anonymous union
1010 OBJECT, with the indicated TYPE, building appropriate VAR_DECLs.
1011 Returns one of the fields for use in the mangled name. */
1014 build_anon_union_vars (tree type, tree object)
1016 tree main_decl = NULL_TREE;
1019 /* Rather than write the code to handle the non-union case,
1020 just give an error. */
1021 if (TREE_CODE (type) != UNION_TYPE)
1022 error ("anonymous struct not inside named type");
1024 for (field = TYPE_FIELDS (type);
1026 field = TREE_CHAIN (field))
1031 if (DECL_ARTIFICIAL (field))
1033 if (TREE_CODE (field) != FIELD_DECL)
1035 pedwarn ("%q+#D invalid; an anonymous union can only "
1036 "have non-static data members", field);
1040 if (TREE_PRIVATE (field))
1041 pedwarn ("private member %q+#D in anonymous union", field);
1042 else if (TREE_PROTECTED (field))
1043 pedwarn ("protected member %q+#D in anonymous union", field);
1045 if (processing_template_decl)
1046 ref = build_min_nt (COMPONENT_REF, object,
1047 DECL_NAME (field), NULL_TREE);
1049 ref = build_class_member_access_expr (object, field, NULL_TREE,
1052 if (DECL_NAME (field))
1056 decl = build_decl (VAR_DECL, DECL_NAME (field), TREE_TYPE (field));
1058 base = get_base_address (object);
1059 TREE_PUBLIC (decl) = TREE_PUBLIC (base);
1060 TREE_STATIC (decl) = TREE_STATIC (base);
1061 DECL_EXTERNAL (decl) = DECL_EXTERNAL (base);
1063 SET_DECL_VALUE_EXPR (decl, ref);
1064 DECL_HAS_VALUE_EXPR_P (decl) = 1;
1066 decl = pushdecl (decl);
1068 else if (ANON_AGGR_TYPE_P (TREE_TYPE (field)))
1069 decl = build_anon_union_vars (TREE_TYPE (field), ref);
1073 if (main_decl == NULL_TREE)
1080 /* Finish off the processing of a UNION_TYPE structure. If the union is an
1081 anonymous union, then all members must be laid out together. PUBLIC_P
1082 is nonzero if this union is not declared static. */
1085 finish_anon_union (tree anon_union_decl)
1091 if (anon_union_decl == error_mark_node)
1094 type = TREE_TYPE (anon_union_decl);
1095 public_p = TREE_PUBLIC (anon_union_decl);
1097 /* The VAR_DECL's context is the same as the TYPE's context. */
1098 DECL_CONTEXT (anon_union_decl) = DECL_CONTEXT (TYPE_NAME (type));
1100 if (TYPE_FIELDS (type) == NULL_TREE)
1105 error ("namespace-scope anonymous aggregates must be static");
1109 main_decl = build_anon_union_vars (type, anon_union_decl);
1110 if (main_decl == error_mark_node)
1112 if (main_decl == NULL_TREE)
1114 warning (0, "anonymous union with no members");
1118 if (!processing_template_decl)
1120 /* Use main_decl to set the mangled name. */
1121 DECL_NAME (anon_union_decl) = DECL_NAME (main_decl);
1122 mangle_decl (anon_union_decl);
1123 DECL_NAME (anon_union_decl) = NULL_TREE;
1126 pushdecl (anon_union_decl);
1127 if (building_stmt_tree ()
1128 && at_function_scope_p ())
1129 add_decl_expr (anon_union_decl);
1130 else if (!processing_template_decl)
1131 rest_of_decl_compilation (anon_union_decl,
1132 toplevel_bindings_p (), at_eof);
1135 /* Auxiliary functions to make type signatures for
1136 `operator new' and `operator delete' correspond to
1137 what compiler will be expecting. */
1140 coerce_new_type (tree type)
1143 tree args = TYPE_ARG_TYPES (type);
1145 gcc_assert (TREE_CODE (type) == FUNCTION_TYPE);
1147 if (!same_type_p (TREE_TYPE (type), ptr_type_node))
1150 error ("%<operator new%> must return type %qT", ptr_type_node);
1153 if (!args || args == void_list_node
1154 || !same_type_p (TREE_VALUE (args), size_type_node))
1157 if (args && args != void_list_node)
1158 args = TREE_CHAIN (args);
1159 pedwarn ("%<operator new%> takes type %<size_t%> (%qT) "
1160 "as first parameter", size_type_node);
1165 args = tree_cons (NULL_TREE, size_type_node, args);
1168 type = build_exception_variant
1169 (build_function_type (ptr_type_node, args),
1170 TYPE_RAISES_EXCEPTIONS (type));
1178 coerce_delete_type (tree type)
1181 tree args = TYPE_ARG_TYPES (type);
1183 gcc_assert (TREE_CODE (type) == FUNCTION_TYPE);
1185 if (!same_type_p (TREE_TYPE (type), void_type_node))
1188 error ("%<operator delete%> must return type %qT", void_type_node);
1191 if (!args || args == void_list_node
1192 || !same_type_p (TREE_VALUE (args), ptr_type_node))
1195 if (args && args != void_list_node)
1196 args = TREE_CHAIN (args);
1197 error ("%<operator delete%> takes type %qT as first parameter",
1203 args = tree_cons (NULL_TREE, ptr_type_node, args);
1206 type = build_exception_variant
1207 (build_function_type (void_type_node, args),
1208 TYPE_RAISES_EXCEPTIONS (type));
1217 mark_vtable_entries (tree decl)
1220 unsigned HOST_WIDE_INT idx;
1222 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (DECL_INITIAL (decl)),
1227 STRIP_NOPS (fnaddr);
1229 if (TREE_CODE (fnaddr) != ADDR_EXPR
1230 && TREE_CODE (fnaddr) != FDESC_EXPR)
1231 /* This entry is an offset: a virtual base class offset, a
1232 virtual call offset, an RTTI offset, etc. */
1235 fn = TREE_OPERAND (fnaddr, 0);
1236 TREE_ADDRESSABLE (fn) = 1;
1237 /* When we don't have vcall offsets, we output thunks whenever
1238 we output the vtables that contain them. With vcall offsets,
1239 we know all the thunks we'll need when we emit a virtual
1240 function, so we emit the thunks there instead. */
1241 if (DECL_THUNK_P (fn))
1242 use_thunk (fn, /*emit_p=*/0);
1247 /* Set DECL up to have the closest approximation of "initialized common"
1248 linkage available. */
1251 comdat_linkage (tree decl)
1254 make_decl_one_only (decl);
1255 else if (TREE_CODE (decl) == FUNCTION_DECL
1256 || (TREE_CODE (decl) == VAR_DECL && DECL_ARTIFICIAL (decl)))
1257 /* We can just emit function and compiler-generated variables
1258 statically; having multiple copies is (for the most part) only
1261 There are two correctness issues, however: the address of a
1262 template instantiation with external linkage should be the
1263 same, independent of what translation unit asks for the
1264 address, and this will not hold when we emit multiple copies of
1265 the function. However, there's little else we can do.
1267 Also, by default, the typeinfo implementation assumes that
1268 there will be only one copy of the string used as the name for
1269 each type. Therefore, if weak symbols are unavailable, the
1270 run-time library should perform a more conservative check; it
1271 should perform a string comparison, rather than an address
1273 TREE_PUBLIC (decl) = 0;
1276 /* Static data member template instantiations, however, cannot
1277 have multiple copies. */
1278 if (DECL_INITIAL (decl) == 0
1279 || DECL_INITIAL (decl) == error_mark_node)
1280 DECL_COMMON (decl) = 1;
1281 else if (EMPTY_CONSTRUCTOR_P (DECL_INITIAL (decl)))
1283 DECL_COMMON (decl) = 1;
1284 DECL_INITIAL (decl) = error_mark_node;
1286 else if (!DECL_EXPLICIT_INSTANTIATION (decl))
1288 /* We can't do anything useful; leave vars for explicit
1290 DECL_EXTERNAL (decl) = 1;
1291 DECL_NOT_REALLY_EXTERN (decl) = 0;
1295 if (DECL_LANG_SPECIFIC (decl))
1296 DECL_COMDAT (decl) = 1;
1299 /* For win32 we also want to put explicit instantiations in
1300 linkonce sections, so that they will be merged with implicit
1301 instantiations; otherwise we get duplicate symbol errors.
1302 For Darwin we do not want explicit instantiations to be
1306 maybe_make_one_only (tree decl)
1308 /* We used to say that this was not necessary on targets that support weak
1309 symbols, because the implicit instantiations will defer to the explicit
1310 one. However, that's not actually the case in SVR4; a strong definition
1311 after a weak one is an error. Also, not making explicit
1312 instantiations one_only means that we can end up with two copies of
1313 some template instantiations. */
1317 /* We can't set DECL_COMDAT on functions, or cp_finish_file will think
1318 we can get away with not emitting them if they aren't used. We need
1319 to for variables so that cp_finish_decl will update their linkage,
1320 because their DECL_INITIAL may not have been set properly yet. */
1322 if (!TARGET_WEAK_NOT_IN_ARCHIVE_TOC
1323 || (! DECL_EXPLICIT_INSTANTIATION (decl)
1324 && ! DECL_TEMPLATE_SPECIALIZATION (decl)))
1326 make_decl_one_only (decl);
1328 if (TREE_CODE (decl) == VAR_DECL)
1330 DECL_COMDAT (decl) = 1;
1331 /* Mark it needed so we don't forget to emit it. */
1332 mark_decl_referenced (decl);
1337 /* Determine whether or not we want to specifically import or export CTYPE,
1338 using various heuristics. */
1341 import_export_class (tree ctype)
1343 /* -1 for imported, 1 for exported. */
1344 int import_export = 0;
1346 /* It only makes sense to call this function at EOF. The reason is
1347 that this function looks at whether or not the first non-inline
1348 non-abstract virtual member function has been defined in this
1349 translation unit. But, we can't possibly know that until we've
1350 seen the entire translation unit. */
1351 gcc_assert (at_eof);
1353 if (CLASSTYPE_INTERFACE_KNOWN (ctype))
1356 /* If MULTIPLE_SYMBOL_SPACES is set and we saw a #pragma interface,
1357 we will have CLASSTYPE_INTERFACE_ONLY set but not
1358 CLASSTYPE_INTERFACE_KNOWN. In that case, we don't want to use this
1359 heuristic because someone will supply a #pragma implementation
1360 elsewhere, and deducing it here would produce a conflict. */
1361 if (CLASSTYPE_INTERFACE_ONLY (ctype))
1364 if (lookup_attribute ("dllimport", TYPE_ATTRIBUTES (ctype)))
1366 else if (lookup_attribute ("dllexport", TYPE_ATTRIBUTES (ctype)))
1368 else if (CLASSTYPE_IMPLICIT_INSTANTIATION (ctype)
1369 && !flag_implicit_templates)
1370 /* For a template class, without -fimplicit-templates, check the
1371 repository. If the virtual table is assigned to this
1372 translation unit, then export the class; otherwise, import
1374 import_export = repo_export_class_p (ctype) ? 1 : -1;
1375 else if (TYPE_POLYMORPHIC_P (ctype))
1377 /* The ABI specifies that the virtual table and associated
1378 information are emitted with the key method, if any. */
1379 tree method = CLASSTYPE_KEY_METHOD (ctype);
1380 /* If weak symbol support is not available, then we must be
1381 careful not to emit the vtable when the key function is
1382 inline. An inline function can be defined in multiple
1383 translation units. If we were to emit the vtable in each
1384 translation unit containing a definition, we would get
1385 multiple definition errors at link-time. */
1386 if (method && (flag_weak || ! DECL_DECLARED_INLINE_P (method)))
1387 import_export = (DECL_REALLY_EXTERN (method) ? -1 : 1);
1390 /* When MULTIPLE_SYMBOL_SPACES is set, we cannot count on seeing
1391 a definition anywhere else. */
1392 if (MULTIPLE_SYMBOL_SPACES && import_export == -1)
1395 /* Allow backends the chance to overrule the decision. */
1396 if (targetm.cxx.import_export_class)
1397 import_export = targetm.cxx.import_export_class (ctype, import_export);
1401 SET_CLASSTYPE_INTERFACE_KNOWN (ctype);
1402 CLASSTYPE_INTERFACE_ONLY (ctype) = (import_export < 0);
1406 /* Return true if VAR has already been provided to the back end; in that
1407 case VAR should not be modified further by the front end. */
1409 var_finalized_p (tree var)
1411 return cgraph_varpool_node (var)->finalized;
1414 /* DECL is a VAR_DECL or FUNCTION_DECL which, for whatever reason,
1415 must be emitted in this translation unit. Mark it as such. */
1418 mark_needed (tree decl)
1420 /* It's possible that we no longer need to set
1421 TREE_SYMBOL_REFERENCED here directly, but doing so is
1423 TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)) = 1;
1424 mark_decl_referenced (decl);
1427 /* DECL is either a FUNCTION_DECL or a VAR_DECL. This function
1428 returns true if a definition of this entity should be provided in
1429 this object file. Callers use this function to determine whether
1430 or not to let the back end know that a definition of DECL is
1431 available in this translation unit. */
1434 decl_needed_p (tree decl)
1436 gcc_assert (TREE_CODE (decl) == VAR_DECL
1437 || TREE_CODE (decl) == FUNCTION_DECL);
1438 /* This function should only be called at the end of the translation
1439 unit. We cannot be sure of whether or not something will be
1440 COMDAT until that point. */
1441 gcc_assert (at_eof);
1443 /* All entities with external linkage that are not COMDAT should be
1444 emitted; they may be referred to from other object files. */
1445 if (TREE_PUBLIC (decl) && !DECL_COMDAT (decl))
1447 /* If this entity was used, let the back-end see it; it will decide
1448 whether or not to emit it into the object file. */
1449 if (TREE_USED (decl)
1450 || (DECL_ASSEMBLER_NAME_SET_P (decl)
1451 && TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))))
1453 /* Otherwise, DECL does not need to be emitted -- yet. A subsequent
1454 reference to DECL might cause it to be emitted later. */
1458 /* If necessary, write out the vtables for the dynamic class CTYPE.
1459 Returns true if any vtables were emitted. */
1462 maybe_emit_vtables (tree ctype)
1468 /* If the vtables for this class have already been emitted there is
1469 nothing more to do. */
1470 primary_vtbl = CLASSTYPE_VTABLES (ctype);
1471 if (var_finalized_p (primary_vtbl))
1473 /* Ignore dummy vtables made by get_vtable_decl. */
1474 if (TREE_TYPE (primary_vtbl) == void_type_node)
1477 /* On some targets, we cannot determine the key method until the end
1478 of the translation unit -- which is when this function is
1480 if (!targetm.cxx.key_method_may_be_inline ())
1481 determine_key_method (ctype);
1483 /* See if any of the vtables are needed. */
1484 for (vtbl = CLASSTYPE_VTABLES (ctype); vtbl; vtbl = TREE_CHAIN (vtbl))
1486 import_export_decl (vtbl);
1487 if (DECL_NOT_REALLY_EXTERN (vtbl) && decl_needed_p (vtbl))
1492 /* If the references to this class' vtables are optimized away,
1493 still emit the appropriate debugging information. See
1495 if (DECL_COMDAT (primary_vtbl)
1496 && CLASSTYPE_DEBUG_REQUESTED (ctype))
1497 note_debug_info_needed (ctype);
1501 /* The ABI requires that we emit all of the vtables if we emit any
1503 for (vtbl = CLASSTYPE_VTABLES (ctype); vtbl; vtbl = TREE_CHAIN (vtbl))
1505 /* Mark entities references from the virtual table as used. */
1506 mark_vtable_entries (vtbl);
1508 if (TREE_TYPE (DECL_INITIAL (vtbl)) == 0)
1510 tree expr = store_init_value (vtbl, DECL_INITIAL (vtbl));
1512 /* It had better be all done at compile-time. */
1517 DECL_EXTERNAL (vtbl) = 0;
1518 rest_of_decl_compilation (vtbl, 1, 1);
1520 /* Because we're only doing syntax-checking, we'll never end up
1521 actually marking the variable as written. */
1522 if (flag_syntax_only)
1523 TREE_ASM_WRITTEN (vtbl) = 1;
1526 /* Since we're writing out the vtable here, also write the debug
1528 note_debug_info_needed (ctype);
1533 /* A special return value from type_visibility meaning internal
1536 enum { VISIBILITY_ANON = VISIBILITY_INTERNAL+1 };
1538 /* walk_tree helper function for type_visibility. */
1541 min_vis_r (tree *tp, int *walk_subtrees, void *data)
1543 int *vis_p = (int *)data;
1548 else if (CLASS_TYPE_P (*tp))
1550 if (!TREE_PUBLIC (TYPE_MAIN_DECL (*tp)))
1552 *vis_p = VISIBILITY_ANON;
1555 else if (CLASSTYPE_VISIBILITY (*tp) > *vis_p)
1556 *vis_p = CLASSTYPE_VISIBILITY (*tp);
1561 /* Returns the visibility of TYPE, which is the minimum visibility of its
1565 type_visibility (tree type)
1567 int vis = VISIBILITY_DEFAULT;
1568 walk_tree_without_duplicates (&type, min_vis_r, &vis);
1572 /* Limit the visibility of DECL to VISIBILITY, if not explicitly
1573 specified (or if VISIBILITY is static). */
1576 constrain_visibility (tree decl, int visibility)
1578 if (visibility == VISIBILITY_ANON)
1580 /* extern "C" declarations aren't affected by the anonymous
1582 if (!DECL_EXTERN_C_P (decl))
1584 TREE_PUBLIC (decl) = 0;
1585 DECL_INTERFACE_KNOWN (decl) = 1;
1586 if (DECL_LANG_SPECIFIC (decl))
1587 DECL_NOT_REALLY_EXTERN (decl) = 1;
1590 else if (visibility > DECL_VISIBILITY (decl)
1591 && !DECL_VISIBILITY_SPECIFIED (decl))
1593 DECL_VISIBILITY (decl) = visibility;
1599 /* Constrain the visibility of DECL based on the visibility of its template
1603 constrain_visibility_for_template (tree decl, tree targs)
1605 /* If this is a template instantiation, check the innermost
1606 template args for visibility constraints. The outer template
1607 args are covered by the class check. */
1608 tree args = INNERMOST_TEMPLATE_ARGS (targs);
1610 for (i = TREE_VEC_LENGTH (args); i > 0; --i)
1614 tree arg = TREE_VEC_ELT (args, i-1);
1616 vis = type_visibility (arg);
1617 else if (TREE_TYPE (arg) && POINTER_TYPE_P (TREE_TYPE (arg)))
1620 if (TREE_CODE (arg) == ADDR_EXPR)
1621 arg = TREE_OPERAND (arg, 0);
1622 if (TREE_CODE (arg) == VAR_DECL
1623 || TREE_CODE (arg) == FUNCTION_DECL)
1625 if (! TREE_PUBLIC (arg))
1626 vis = VISIBILITY_ANON;
1628 vis = DECL_VISIBILITY (arg);
1632 constrain_visibility (decl, vis);
1636 /* Like c_determine_visibility, but with additional C++-specific
1639 Function-scope entities can rely on the function's visibility because
1640 it is set in start_preparsed_function.
1642 Class-scope entities cannot rely on the class's visibility until the end
1643 of the enclosing class definition.
1645 Note that because namespaces have multiple independent definitions,
1646 namespace visibility is handled elsewhere using the #pragma visibility
1647 machinery rather than by decorating the namespace declaration.
1649 The goal is for constraints from the type to give a diagnostic, and
1650 other constraints to be applied silently. */
1653 determine_visibility (tree decl)
1655 tree class_type = NULL_TREE;
1658 /* Remember that all decls get VISIBILITY_DEFAULT when built. */
1660 /* Only relevant for names with external linkage. */
1661 if (!TREE_PUBLIC (decl))
1664 /* Cloned constructors and destructors get the same visibility as
1665 the underlying function. That should be set up in
1666 maybe_clone_body. */
1667 gcc_assert (!DECL_CLONED_FUNCTION_P (decl));
1669 if (TREE_CODE (decl) == TYPE_DECL)
1671 if (CLASS_TYPE_P (TREE_TYPE (decl)))
1672 use_template = CLASSTYPE_USE_TEMPLATE (TREE_TYPE (decl));
1673 else if (TYPE_TEMPLATE_INFO (TREE_TYPE (decl)))
1678 else if (DECL_LANG_SPECIFIC (decl))
1679 use_template = DECL_USE_TEMPLATE (decl);
1683 /* Anything that is exported must have default visibility. */
1684 if (TARGET_DLLIMPORT_DECL_ATTRIBUTES
1685 && lookup_attribute ("dllexport",
1686 TREE_CODE (decl) == TYPE_DECL
1687 ? TYPE_ATTRIBUTES (TREE_TYPE (decl))
1688 : DECL_ATTRIBUTES (decl)))
1690 DECL_VISIBILITY (decl) = VISIBILITY_DEFAULT;
1691 DECL_VISIBILITY_SPECIFIED (decl) = 1;
1694 /* If DECL is a member of a class, visibility specifiers on the
1695 class can influence the visibility of the DECL. */
1696 if (DECL_CLASS_SCOPE_P (decl))
1697 class_type = DECL_CONTEXT (decl);
1698 else if (TREE_CODE (decl) == VAR_DECL
1699 && DECL_TINFO_P (decl)
1700 && CLASS_TYPE_P (TREE_TYPE (DECL_NAME (decl))))
1701 class_type = TREE_TYPE (DECL_NAME (decl));
1704 /* Not a class member. */
1706 /* Virtual tables have DECL_CONTEXT set to their associated class,
1707 so they are automatically handled above. */
1708 gcc_assert (TREE_CODE (decl) != VAR_DECL
1709 || !DECL_VTABLE_OR_VTT_P (decl));
1711 if (DECL_FUNCTION_SCOPE_P (decl) && ! DECL_VISIBILITY_SPECIFIED (decl))
1713 /* Local statics and classes get the visibility of their
1714 containing function by default, except that
1715 -fvisibility-inlines-hidden doesn't affect them. */
1716 tree fn = DECL_CONTEXT (decl);
1717 if (DECL_VISIBILITY_SPECIFIED (fn) || ! DECL_CLASS_SCOPE_P (fn))
1719 DECL_VISIBILITY (decl) = DECL_VISIBILITY (fn);
1720 DECL_VISIBILITY_SPECIFIED (decl) =
1721 DECL_VISIBILITY_SPECIFIED (fn);
1724 determine_visibility_from_class (decl, DECL_CONTEXT (fn));
1726 /* Local classes in templates have CLASSTYPE_USE_TEMPLATE set,
1727 but have no TEMPLATE_INFO, so don't try to check it. */
1730 else if (TREE_CODE (decl) == VAR_DECL && DECL_TINFO_P (decl))
1732 /* tinfo visibility is based on the type it's for. */
1733 constrain_visibility
1734 (decl, type_visibility (TREE_TYPE (DECL_NAME (decl))));
1736 else if (use_template)
1737 /* Template instantiations and specializations get visibility based
1738 on their template unless they override it with an attribute. */;
1739 else if (! DECL_VISIBILITY_SPECIFIED (decl))
1741 /* Set default visibility to whatever the user supplied with
1742 #pragma GCC visibility or a namespace visibility attribute. */
1743 DECL_VISIBILITY (decl) = default_visibility;
1744 DECL_VISIBILITY_SPECIFIED (decl) = visibility_options.inpragma;
1750 /* If the specialization doesn't specify visibility, use the
1751 visibility from the template. */
1752 tree tinfo = (TREE_CODE (decl) == TYPE_DECL
1753 ? TYPE_TEMPLATE_INFO (TREE_TYPE (decl))
1754 : DECL_TEMPLATE_INFO (decl));
1755 tree args = TI_ARGS (tinfo);
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);
1773 determine_visibility_from_class (decl, class_type);
1775 if (decl_anon_ns_mem_p (decl))
1776 /* Names in an anonymous namespace get internal linkage.
1777 This might change once we implement export. */
1778 constrain_visibility (decl, VISIBILITY_ANON);
1779 else if (TREE_CODE (decl) != TYPE_DECL)
1781 /* Propagate anonymity from type to decl. */
1782 int tvis = type_visibility (TREE_TYPE (decl));
1783 if (tvis == VISIBILITY_ANON)
1784 constrain_visibility (decl, tvis);
1788 /* By default, static data members and function members receive
1789 the visibility of their containing class. */
1792 determine_visibility_from_class (tree decl, tree class_type)
1794 if (visibility_options.inlines_hidden
1795 /* Don't do this for inline templates; specializations might not be
1796 inline, and we don't want them to inherit the hidden
1797 visibility. We'll set it here for all inline instantiations. */
1798 && !processing_template_decl
1799 && ! DECL_VISIBILITY_SPECIFIED (decl)
1800 && TREE_CODE (decl) == FUNCTION_DECL
1801 && DECL_DECLARED_INLINE_P (decl)
1802 && (! DECL_LANG_SPECIFIC (decl)
1803 || ! DECL_EXPLICIT_INSTANTIATION (decl)))
1804 DECL_VISIBILITY (decl) = VISIBILITY_HIDDEN;
1805 else if (!DECL_VISIBILITY_SPECIFIED (decl))
1807 /* Default to the class visibility. */
1808 DECL_VISIBILITY (decl) = CLASSTYPE_VISIBILITY (class_type);
1809 DECL_VISIBILITY_SPECIFIED (decl)
1810 = CLASSTYPE_VISIBILITY_SPECIFIED (class_type);
1813 /* Give the target a chance to override the visibility associated
1815 if (TREE_CODE (decl) == VAR_DECL
1816 && (DECL_TINFO_P (decl)
1817 || (DECL_VTABLE_OR_VTT_P (decl)
1818 /* Construction virtual tables are not exported because
1819 they cannot be referred to from other object files;
1820 their name is not standardized by the ABI. */
1821 && !DECL_CONSTRUCTION_VTABLE_P (decl)))
1822 && TREE_PUBLIC (decl)
1823 && !DECL_REALLY_EXTERN (decl)
1824 && !DECL_VISIBILITY_SPECIFIED (decl)
1825 && !CLASSTYPE_VISIBILITY_SPECIFIED (class_type))
1826 targetm.cxx.determine_class_data_visibility (decl);
1829 /* Constrain the visibility of a class TYPE based on the visibility of its
1830 field types. Warn if any fields require lesser visibility. */
1833 constrain_class_visibility (tree type)
1839 int vis = type_visibility (type);
1841 if (vis == VISIBILITY_ANON
1842 || DECL_IN_SYSTEM_HEADER (TYPE_MAIN_DECL (type)))
1845 /* Don't warn about visibility if the class has explicit visibility. */
1846 if (CLASSTYPE_VISIBILITY_SPECIFIED (type))
1847 vis = VISIBILITY_INTERNAL;
1849 for (t = TYPE_FIELDS (type); t; t = TREE_CHAIN (t))
1850 if (TREE_CODE (t) == FIELD_DECL && TREE_TYPE (t) != error_mark_node)
1852 tree ftype = strip_array_types (TREE_TYPE (t));
1853 int subvis = type_visibility (ftype);
1855 if (subvis == VISIBILITY_ANON)
1857 %qT has a field %qD whose type uses the anonymous namespace",
1859 else if (IS_AGGR_TYPE (ftype)
1860 && vis < VISIBILITY_HIDDEN
1861 && subvis >= VISIBILITY_HIDDEN)
1862 warning (OPT_Wattributes, "\
1863 %qT declared with greater visibility than the type of its field %qD",
1867 binfo = TYPE_BINFO (type);
1868 for (i = 0; BINFO_BASE_ITERATE (binfo, i, t); ++i)
1870 int subvis = type_visibility (TREE_TYPE (t));
1872 if (subvis == VISIBILITY_ANON)
1874 %qT has a base %qT whose type uses the anonymous namespace",
1875 type, TREE_TYPE (t));
1876 else if (vis < VISIBILITY_HIDDEN
1877 && subvis >= VISIBILITY_HIDDEN)
1878 warning (OPT_Wattributes, "\
1879 %qT declared with greater visibility than its base %qT",
1880 type, TREE_TYPE (t));
1884 /* DECL is a FUNCTION_DECL or VAR_DECL. If the object file linkage
1885 for DECL has not already been determined, do so now by setting
1886 DECL_EXTERNAL, DECL_COMDAT and other related flags. Until this
1887 function is called entities with vague linkage whose definitions
1888 are available must have TREE_PUBLIC set.
1890 If this function decides to place DECL in COMDAT, it will set
1891 appropriate flags -- but will not clear DECL_EXTERNAL. It is up to
1892 the caller to decide whether or not to clear DECL_EXTERNAL. Some
1893 callers defer that decision until it is clear that DECL is actually
1897 import_export_decl (tree decl)
1902 tree class_type = NULL_TREE;
1904 if (DECL_INTERFACE_KNOWN (decl))
1907 /* We cannot determine what linkage to give to an entity with vague
1908 linkage until the end of the file. For example, a virtual table
1909 for a class will be defined if and only if the key method is
1910 defined in this translation unit. As a further example, consider
1911 that when compiling a translation unit that uses PCH file with
1912 "-frepo" it would be incorrect to make decisions about what
1913 entities to emit when building the PCH; those decisions must be
1914 delayed until the repository information has been processed. */
1915 gcc_assert (at_eof);
1916 /* Object file linkage for explicit instantiations is handled in
1917 mark_decl_instantiated. For static variables in functions with
1918 vague linkage, maybe_commonize_var is used.
1920 Therefore, the only declarations that should be provided to this
1921 function are those with external linkage that are:
1923 * implicit instantiations of function templates
1927 * implicit instantiations of static data members of class
1934 Furthermore, all entities that reach this point must have a
1935 definition available in this translation unit.
1937 The following assertions check these conditions. */
1938 gcc_assert (TREE_CODE (decl) == FUNCTION_DECL
1939 || TREE_CODE (decl) == VAR_DECL);
1940 /* Any code that creates entities with TREE_PUBLIC cleared should
1941 also set DECL_INTERFACE_KNOWN. */
1942 gcc_assert (TREE_PUBLIC (decl));
1943 if (TREE_CODE (decl) == FUNCTION_DECL)
1944 gcc_assert (DECL_IMPLICIT_INSTANTIATION (decl)
1945 || DECL_FRIEND_PSEUDO_TEMPLATE_INSTANTIATION (decl)
1946 || DECL_DECLARED_INLINE_P (decl));
1948 gcc_assert (DECL_IMPLICIT_INSTANTIATION (decl)
1949 || DECL_VTABLE_OR_VTT_P (decl)
1950 || DECL_TINFO_P (decl));
1951 /* Check that a definition of DECL is available in this translation
1953 gcc_assert (!DECL_REALLY_EXTERN (decl));
1955 /* Assume that DECL will not have COMDAT linkage. */
1957 /* Assume that DECL will not be imported into this translation
1961 /* See if the repository tells us whether or not to emit DECL in
1962 this translation unit. */
1963 emit_p = repo_emit_p (decl);
1966 else if (emit_p == 1)
1968 /* The repository indicates that this entity should be defined
1969 here. Make sure the back end honors that request. */
1970 if (TREE_CODE (decl) == VAR_DECL)
1972 else if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (decl)
1973 || DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P (decl))
1976 FOR_EACH_CLONE (clone, decl)
1977 mark_needed (clone);
1981 /* Output the definition as an ordinary strong definition. */
1982 DECL_EXTERNAL (decl) = 0;
1983 DECL_INTERFACE_KNOWN (decl) = 1;
1988 /* We have already decided what to do with this DECL; there is no
1989 need to check anything further. */
1991 else if (TREE_CODE (decl) == VAR_DECL && DECL_VTABLE_OR_VTT_P (decl))
1993 class_type = DECL_CONTEXT (decl);
1994 import_export_class (class_type);
1995 if (TYPE_FOR_JAVA (class_type))
1997 else if (CLASSTYPE_INTERFACE_KNOWN (class_type)
1998 && CLASSTYPE_INTERFACE_ONLY (class_type))
2000 else if ((!flag_weak || TARGET_WEAK_NOT_IN_ARCHIVE_TOC)
2001 && !CLASSTYPE_USE_TEMPLATE (class_type)
2002 && CLASSTYPE_KEY_METHOD (class_type)
2003 && !DECL_DECLARED_INLINE_P (CLASSTYPE_KEY_METHOD (class_type)))
2004 /* The ABI requires that all virtual tables be emitted with
2005 COMDAT linkage. However, on systems where COMDAT symbols
2006 don't show up in the table of contents for a static
2007 archive, or on systems without weak symbols (where we
2008 approximate COMDAT linkage by using internal linkage), the
2009 linker will report errors about undefined symbols because
2010 it will not see the virtual table definition. Therefore,
2011 in the case that we know that the virtual table will be
2012 emitted in only one translation unit, we make the virtual
2013 table an ordinary definition with external linkage. */
2014 DECL_EXTERNAL (decl) = 0;
2015 else if (CLASSTYPE_INTERFACE_KNOWN (class_type))
2017 /* CLASS_TYPE is being exported from this translation unit,
2018 so DECL should be defined here. */
2019 if (!flag_weak && CLASSTYPE_EXPLICIT_INSTANTIATION (class_type))
2020 /* If a class is declared in a header with the "extern
2021 template" extension, then it will not be instantiated,
2022 even in translation units that would normally require
2023 it. Often such classes are explicitly instantiated in
2024 one translation unit. Therefore, the explicit
2025 instantiation must be made visible to other translation
2027 DECL_EXTERNAL (decl) = 0;
2030 /* The generic C++ ABI says that class data is always
2031 COMDAT, even if there is a key function. Some
2032 variants (e.g., the ARM EABI) says that class data
2033 only has COMDAT linkage if the class data might be
2034 emitted in more than one translation unit. When the
2035 key method can be inline and is inline, we still have
2036 to arrange for comdat even though
2037 class_data_always_comdat is false. */
2038 if (!CLASSTYPE_KEY_METHOD (class_type)
2039 || DECL_DECLARED_INLINE_P (CLASSTYPE_KEY_METHOD (class_type))
2040 || targetm.cxx.class_data_always_comdat ())
2042 /* The ABI requires COMDAT linkage. Normally, we
2043 only emit COMDAT things when they are needed;
2044 make sure that we realize that this entity is
2051 else if (!flag_implicit_templates
2052 && CLASSTYPE_IMPLICIT_INSTANTIATION (class_type))
2057 else if (TREE_CODE (decl) == VAR_DECL && DECL_TINFO_P (decl))
2059 tree type = TREE_TYPE (DECL_NAME (decl));
2060 if (CLASS_TYPE_P (type))
2063 import_export_class (type);
2064 if (CLASSTYPE_INTERFACE_KNOWN (type)
2065 && TYPE_POLYMORPHIC_P (type)
2066 && CLASSTYPE_INTERFACE_ONLY (type)
2067 /* If -fno-rtti was specified, then we cannot be sure
2068 that RTTI information will be emitted with the
2069 virtual table of the class, so we must emit it
2070 wherever it is used. */
2075 if (CLASSTYPE_INTERFACE_KNOWN (type)
2076 && !CLASSTYPE_INTERFACE_ONLY (type))
2078 comdat_p = (targetm.cxx.class_data_always_comdat ()
2079 || (CLASSTYPE_KEY_METHOD (type)
2080 && DECL_DECLARED_INLINE_P (CLASSTYPE_KEY_METHOD (type))));
2085 DECL_EXTERNAL (decl) = 0;
2095 else if (DECL_TEMPLATE_INSTANTIATION (decl)
2096 || DECL_FRIEND_PSEUDO_TEMPLATE_INSTANTIATION (decl))
2098 /* DECL is an implicit instantiation of a function or static
2100 if (flag_implicit_templates
2101 || (flag_implicit_inline_templates
2102 && TREE_CODE (decl) == FUNCTION_DECL
2103 && DECL_DECLARED_INLINE_P (decl)))
2106 /* If we are not implicitly generating templates, then mark
2107 this entity as undefined in this translation unit. */
2110 else if (DECL_FUNCTION_MEMBER_P (decl))
2112 if (!DECL_DECLARED_INLINE_P (decl))
2114 tree ctype = DECL_CONTEXT (decl);
2115 import_export_class (ctype);
2116 if (CLASSTYPE_INTERFACE_KNOWN (ctype))
2118 DECL_NOT_REALLY_EXTERN (decl)
2119 = ! (CLASSTYPE_INTERFACE_ONLY (ctype)
2120 || (DECL_DECLARED_INLINE_P (decl)
2121 && ! flag_implement_inlines
2122 && !DECL_VINDEX (decl)));
2124 if (!DECL_NOT_REALLY_EXTERN (decl))
2125 DECL_EXTERNAL (decl) = 1;
2127 /* Always make artificials weak. */
2128 if (DECL_ARTIFICIAL (decl) && flag_weak)
2131 maybe_make_one_only (decl);
2142 /* If we are importing DECL into this translation unit, mark is
2143 an undefined here. */
2144 DECL_EXTERNAL (decl) = 1;
2145 DECL_NOT_REALLY_EXTERN (decl) = 0;
2149 /* If we decided to put DECL in COMDAT, mark it accordingly at
2151 comdat_linkage (decl);
2154 DECL_INTERFACE_KNOWN (decl) = 1;
2157 /* Return an expression that performs the destruction of DECL, which
2158 must be a VAR_DECL whose type has a non-trivial destructor, or is
2159 an array whose (innermost) elements have a non-trivial destructor. */
2162 build_cleanup (tree decl)
2165 tree type = TREE_TYPE (decl);
2167 /* This function should only be called for declarations that really
2168 require cleanups. */
2169 gcc_assert (!TYPE_HAS_TRIVIAL_DESTRUCTOR (type));
2171 /* Treat all objects with destructors as used; the destructor may do
2172 something substantive. */
2175 if (TREE_CODE (type) == ARRAY_TYPE)
2179 cxx_mark_addressable (decl);
2180 temp = build1 (ADDR_EXPR, build_pointer_type (type), decl);
2182 temp = build_delete (TREE_TYPE (temp), temp,
2183 sfk_complete_destructor,
2184 LOOKUP_NORMAL|LOOKUP_NONVIRTUAL|LOOKUP_DESTRUCTOR, 0);
2188 /* Returns the initialization guard variable for the variable DECL,
2189 which has static storage duration. */
2192 get_guard (tree decl)
2197 sname = mangle_guard_variable (decl);
2198 guard = IDENTIFIER_GLOBAL_VALUE (sname);
2203 /* We use a type that is big enough to contain a mutex as well
2204 as an integer counter. */
2205 guard_type = targetm.cxx.guard_type ();
2206 guard = build_decl (VAR_DECL, sname, guard_type);
2208 /* The guard should have the same linkage as what it guards. */
2209 TREE_PUBLIC (guard) = TREE_PUBLIC (decl);
2210 TREE_STATIC (guard) = TREE_STATIC (decl);
2211 DECL_COMMON (guard) = DECL_COMMON (decl);
2212 DECL_ONE_ONLY (guard) = DECL_ONE_ONLY (decl);
2213 if (TREE_PUBLIC (decl))
2214 DECL_WEAK (guard) = DECL_WEAK (decl);
2216 DECL_ARTIFICIAL (guard) = 1;
2217 DECL_IGNORED_P (guard) = 1;
2218 TREE_USED (guard) = 1;
2219 pushdecl_top_level_and_finish (guard, NULL_TREE);
2224 /* Return those bits of the GUARD variable that should be set when the
2225 guarded entity is actually initialized. */
2228 get_guard_bits (tree guard)
2230 if (!targetm.cxx.guard_mask_bit ())
2232 /* We only set the first byte of the guard, in order to leave room
2233 for a mutex in the high-order bits. */
2234 guard = build1 (ADDR_EXPR,
2235 build_pointer_type (TREE_TYPE (guard)),
2237 guard = build1 (NOP_EXPR,
2238 build_pointer_type (char_type_node),
2240 guard = build1 (INDIRECT_REF, char_type_node, guard);
2246 /* Return an expression which determines whether or not the GUARD
2247 variable has already been initialized. */
2250 get_guard_cond (tree guard)
2254 /* Check to see if the GUARD is zero. */
2255 guard = get_guard_bits (guard);
2257 /* Mask off all but the low bit. */
2258 if (targetm.cxx.guard_mask_bit ())
2260 guard_value = integer_one_node;
2261 if (!same_type_p (TREE_TYPE (guard_value), TREE_TYPE (guard)))
2262 guard_value = convert (TREE_TYPE (guard), guard_value);
2263 guard = cp_build_binary_op (BIT_AND_EXPR, guard, guard_value);
2266 guard_value = integer_zero_node;
2267 if (!same_type_p (TREE_TYPE (guard_value), TREE_TYPE (guard)))
2268 guard_value = convert (TREE_TYPE (guard), guard_value);
2269 return cp_build_binary_op (EQ_EXPR, guard, guard_value);
2272 /* Return an expression which sets the GUARD variable, indicating that
2273 the variable being guarded has been initialized. */
2276 set_guard (tree guard)
2280 /* Set the GUARD to one. */
2281 guard = get_guard_bits (guard);
2282 guard_init = integer_one_node;
2283 if (!same_type_p (TREE_TYPE (guard_init), TREE_TYPE (guard)))
2284 guard_init = convert (TREE_TYPE (guard), guard_init);
2285 return build_modify_expr (guard, NOP_EXPR, guard_init);
2288 /* Start the process of running a particular set of global constructors
2289 or destructors. Subroutine of do_[cd]tors. */
2292 start_objects (int method_type, int initp)
2298 /* Make ctor or dtor function. METHOD_TYPE may be 'I' or 'D'. */
2300 if (initp != DEFAULT_INIT_PRIORITY)
2310 sprintf (type, "%c%c%.5u", method_type, joiner, initp);
2313 sprintf (type, "%c", method_type);
2315 fndecl = build_lang_decl (FUNCTION_DECL,
2316 get_file_function_name_long (type),
2317 build_function_type (void_type_node,
2319 start_preparsed_function (fndecl, /*attrs=*/NULL_TREE, SF_PRE_PARSED);
2321 /* It can be a static function as long as collect2 does not have
2322 to scan the object file to find its ctor/dtor routine. */
2323 TREE_PUBLIC (current_function_decl) = ! targetm.have_ctors_dtors;
2325 /* Mark this declaration as used to avoid spurious warnings. */
2326 TREE_USED (current_function_decl) = 1;
2328 /* Mark this function as a global constructor or destructor. */
2329 if (method_type == 'I')
2330 DECL_GLOBAL_CTOR_P (current_function_decl) = 1;
2332 DECL_GLOBAL_DTOR_P (current_function_decl) = 1;
2333 DECL_LANG_SPECIFIC (current_function_decl)->decl_flags.u2sel = 1;
2335 body = begin_compound_stmt (BCS_FN_BODY);
2337 /* We cannot allow these functions to be elided, even if they do not
2338 have external linkage. And, there's no point in deferring
2339 compilation of these functions; they're all going to have to be
2341 DECL_INLINE (current_function_decl) = 0;
2342 DECL_UNINLINABLE (current_function_decl) = 1;
2347 /* Finish the process of running a particular set of global constructors
2348 or destructors. Subroutine of do_[cd]tors. */
2351 finish_objects (int method_type, int initp, tree body)
2356 finish_compound_stmt (body);
2357 fn = finish_function (0);
2358 expand_or_defer_fn (fn);
2360 /* When only doing semantic analysis, and no RTL generation, we
2361 can't call functions that directly emit assembly code; there is
2362 no assembly file in which to put the code. */
2363 if (flag_syntax_only)
2366 if (targetm.have_ctors_dtors)
2368 rtx fnsym = XEXP (DECL_RTL (fn), 0);
2369 cgraph_mark_needed_node (cgraph_node (fn));
2370 if (method_type == 'I')
2371 (* targetm.asm_out.constructor) (fnsym, initp);
2373 (* targetm.asm_out.destructor) (fnsym, initp);
2377 /* The names of the parameters to the function created to handle
2378 initializations and destructions for objects with static storage
2380 #define INITIALIZE_P_IDENTIFIER "__initialize_p"
2381 #define PRIORITY_IDENTIFIER "__priority"
2383 /* The name of the function we create to handle initializations and
2384 destructions for objects with static storage duration. */
2385 #define SSDF_IDENTIFIER "__static_initialization_and_destruction"
2387 /* The declaration for the __INITIALIZE_P argument. */
2388 static GTY(()) tree initialize_p_decl;
2390 /* The declaration for the __PRIORITY argument. */
2391 static GTY(()) tree priority_decl;
2393 /* The declaration for the static storage duration function. */
2394 static GTY(()) tree ssdf_decl;
2396 /* All the static storage duration functions created in this
2397 translation unit. */
2398 static GTY(()) VEC(tree,gc) *ssdf_decls;
2400 /* A map from priority levels to information about that priority
2401 level. There may be many such levels, so efficient lookup is
2403 static splay_tree priority_info_map;
2405 /* Begins the generation of the function that will handle all
2406 initialization and destruction of objects with static storage
2407 duration. The function generated takes two parameters of type
2408 `int': __INITIALIZE_P and __PRIORITY. If __INITIALIZE_P is
2409 nonzero, it performs initializations. Otherwise, it performs
2410 destructions. It only performs those initializations or
2411 destructions with the indicated __PRIORITY. The generated function
2414 It is assumed that this function will only be called once per
2415 translation unit. */
2418 start_static_storage_duration_function (unsigned count)
2423 char id[sizeof (SSDF_IDENTIFIER) + 1 /* '\0' */ + 32];
2425 /* Create the identifier for this function. It will be of the form
2426 SSDF_IDENTIFIER_<number>. */
2427 sprintf (id, "%s_%u", SSDF_IDENTIFIER, count);
2429 /* Create the parameters. */
2430 parm_types = void_list_node;
2431 parm_types = tree_cons (NULL_TREE, integer_type_node, parm_types);
2432 parm_types = tree_cons (NULL_TREE, integer_type_node, parm_types);
2433 type = build_function_type (void_type_node, parm_types);
2435 /* Create the FUNCTION_DECL itself. */
2436 ssdf_decl = build_lang_decl (FUNCTION_DECL,
2437 get_identifier (id),
2439 TREE_PUBLIC (ssdf_decl) = 0;
2440 DECL_ARTIFICIAL (ssdf_decl) = 1;
2442 /* Put this function in the list of functions to be called from the
2443 static constructors and destructors. */
2446 ssdf_decls = VEC_alloc (tree, gc, 32);
2448 /* Take this opportunity to initialize the map from priority
2449 numbers to information about that priority level. */
2450 priority_info_map = splay_tree_new (splay_tree_compare_ints,
2451 /*delete_key_fn=*/0,
2452 /*delete_value_fn=*/
2453 (splay_tree_delete_value_fn) &free);
2455 /* We always need to generate functions for the
2456 DEFAULT_INIT_PRIORITY so enter it now. That way when we walk
2457 priorities later, we'll be sure to find the
2458 DEFAULT_INIT_PRIORITY. */
2459 get_priority_info (DEFAULT_INIT_PRIORITY);
2462 VEC_safe_push (tree, gc, ssdf_decls, ssdf_decl);
2464 /* Create the argument list. */
2465 initialize_p_decl = cp_build_parm_decl
2466 (get_identifier (INITIALIZE_P_IDENTIFIER), integer_type_node);
2467 DECL_CONTEXT (initialize_p_decl) = ssdf_decl;
2468 TREE_USED (initialize_p_decl) = 1;
2469 priority_decl = cp_build_parm_decl
2470 (get_identifier (PRIORITY_IDENTIFIER), integer_type_node);
2471 DECL_CONTEXT (priority_decl) = ssdf_decl;
2472 TREE_USED (priority_decl) = 1;
2474 TREE_CHAIN (initialize_p_decl) = priority_decl;
2475 DECL_ARGUMENTS (ssdf_decl) = initialize_p_decl;
2477 /* Put the function in the global scope. */
2478 pushdecl (ssdf_decl);
2480 /* Start the function itself. This is equivalent to declaring the
2483 static void __ssdf (int __initialize_p, init __priority_p);
2485 It is static because we only need to call this function from the
2486 various constructor and destructor functions for this module. */
2487 start_preparsed_function (ssdf_decl,
2488 /*attrs=*/NULL_TREE,
2491 /* Set up the scope of the outermost block in the function. */
2492 body = begin_compound_stmt (BCS_FN_BODY);
2494 /* This function must not be deferred because we are depending on
2495 its compilation to tell us what is TREE_SYMBOL_REFERENCED. */
2496 DECL_INLINE (ssdf_decl) = 0;
2497 DECL_UNINLINABLE (ssdf_decl) = 1;
2502 /* Finish the generation of the function which performs initialization
2503 and destruction of objects with static storage duration. After
2504 this point, no more such objects can be created. */
2507 finish_static_storage_duration_function (tree body)
2509 /* Close out the function. */
2510 finish_compound_stmt (body);
2511 expand_or_defer_fn (finish_function (0));
2514 /* Return the information about the indicated PRIORITY level. If no
2515 code to handle this level has yet been generated, generate the
2516 appropriate prologue. */
2518 static priority_info
2519 get_priority_info (int priority)
2524 n = splay_tree_lookup (priority_info_map,
2525 (splay_tree_key) priority);
2528 /* Create a new priority information structure, and insert it
2530 pi = XNEW (struct priority_info_s);
2531 pi->initializations_p = 0;
2532 pi->destructions_p = 0;
2533 splay_tree_insert (priority_info_map,
2534 (splay_tree_key) priority,
2535 (splay_tree_value) pi);
2538 pi = (priority_info) n->value;
2543 /* The effective initialization priority of a DECL. */
2545 #define DECL_EFFECTIVE_INIT_PRIORITY(decl) \
2546 ((!DECL_HAS_INIT_PRIORITY_P (decl) || DECL_INIT_PRIORITY (decl) == 0) \
2547 ? DEFAULT_INIT_PRIORITY : DECL_INIT_PRIORITY (decl))
2549 /* Whether a DECL needs a guard to protect it against multiple
2552 #define NEEDS_GUARD_P(decl) (TREE_PUBLIC (decl) && (DECL_COMMON (decl) \
2553 || DECL_ONE_ONLY (decl) \
2554 || DECL_WEAK (decl)))
2556 /* Set up to handle the initialization or destruction of DECL. If
2557 INITP is nonzero, we are initializing the variable. Otherwise, we
2558 are destroying it. */
2561 one_static_initialization_or_destruction (tree decl, tree init, bool initp)
2563 tree guard_if_stmt = NULL_TREE;
2566 /* If we are supposed to destruct and there's a trivial destructor,
2567 nothing has to be done. */
2569 && TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
2572 /* Trick the compiler into thinking we are at the file and line
2573 where DECL was declared so that error-messages make sense, and so
2574 that the debugger will show somewhat sensible file and line
2576 input_location = DECL_SOURCE_LOCATION (decl);
2582 Access control for implicit calls to the constructors,
2583 the conversion functions, or the destructor called to
2584 create and destroy a static data member is performed as
2585 if these calls appeared in the scope of the member's
2588 we pretend we are in a static member function of the class of
2589 which the DECL is a member. */
2590 if (member_p (decl))
2592 DECL_CONTEXT (current_function_decl) = DECL_CONTEXT (decl);
2593 DECL_STATIC_FUNCTION_P (current_function_decl) = 1;
2596 /* Assume we don't need a guard. */
2598 /* We need a guard if this is an object with external linkage that
2599 might be initialized in more than one place. (For example, a
2600 static data member of a template, when the data member requires
2602 if (NEEDS_GUARD_P (decl))
2606 guard = get_guard (decl);
2608 /* When using __cxa_atexit, we just check the GUARD as we would
2609 for a local static. */
2610 if (flag_use_cxa_atexit)
2612 /* When using __cxa_atexit, we never try to destroy
2613 anything from a static destructor. */
2615 guard_cond = get_guard_cond (guard);
2617 /* If we don't have __cxa_atexit, then we will be running
2618 destructors from .fini sections, or their equivalents. So,
2619 we need to know how many times we've tried to initialize this
2620 object. We do initializations only if the GUARD is zero,
2621 i.e., if we are the first to initialize the variable. We do
2622 destructions only if the GUARD is one, i.e., if we are the
2623 last to destroy the variable. */
2626 = cp_build_binary_op (EQ_EXPR,
2627 build_unary_op (PREINCREMENT_EXPR,
2633 = cp_build_binary_op (EQ_EXPR,
2634 build_unary_op (PREDECREMENT_EXPR,
2639 guard_if_stmt = begin_if_stmt ();
2640 finish_if_stmt_cond (guard_cond, guard_if_stmt);
2644 /* If we're using __cxa_atexit, we have not already set the GUARD,
2645 so we must do so now. */
2646 if (guard && initp && flag_use_cxa_atexit)
2647 finish_expr_stmt (set_guard (guard));
2649 /* Perform the initialization or destruction. */
2653 finish_expr_stmt (init);
2655 /* If we're using __cxa_atexit, register a function that calls the
2656 destructor for the object. */
2657 if (flag_use_cxa_atexit)
2658 finish_expr_stmt (register_dtor_fn (decl));
2661 finish_expr_stmt (build_cleanup (decl));
2663 /* Finish the guard if-stmt, if necessary. */
2666 finish_then_clause (guard_if_stmt);
2667 finish_if_stmt (guard_if_stmt);
2670 /* Now that we're done with DECL we don't need to pretend to be a
2671 member of its class any longer. */
2672 DECL_CONTEXT (current_function_decl) = NULL_TREE;
2673 DECL_STATIC_FUNCTION_P (current_function_decl) = 0;
2676 /* Generate code to do the initialization or destruction of the decls in VARS,
2677 a TREE_LIST of VAR_DECL with static storage duration.
2678 Whether initialization or destruction is performed is specified by INITP. */
2681 do_static_initialization_or_destruction (tree vars, bool initp)
2683 tree node, init_if_stmt, cond;
2685 /* Build the outer if-stmt to check for initialization or destruction. */
2686 init_if_stmt = begin_if_stmt ();
2687 cond = initp ? integer_one_node : integer_zero_node;
2688 cond = cp_build_binary_op (EQ_EXPR,
2691 finish_if_stmt_cond (cond, init_if_stmt);
2695 tree decl = TREE_VALUE (node);
2696 tree priority_if_stmt;
2700 /* If we don't need a destructor, there's nothing to do. Avoid
2701 creating a possibly empty if-stmt. */
2702 if (!initp && TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
2704 node = TREE_CHAIN (node);
2708 /* Remember that we had an initialization or finalization at this
2710 priority = DECL_EFFECTIVE_INIT_PRIORITY (decl);
2711 pi = get_priority_info (priority);
2713 pi->initializations_p = 1;
2715 pi->destructions_p = 1;
2717 /* Conditionalize this initialization on being in the right priority
2718 and being initializing/finalizing appropriately. */
2719 priority_if_stmt = begin_if_stmt ();
2720 cond = cp_build_binary_op (EQ_EXPR,
2722 build_int_cst (NULL_TREE, priority));
2723 finish_if_stmt_cond (cond, priority_if_stmt);
2725 /* Process initializers with same priority. */
2727 && DECL_EFFECTIVE_INIT_PRIORITY (TREE_VALUE (node)) == priority;
2728 node = TREE_CHAIN (node))
2729 /* Do one initialization or destruction. */
2730 one_static_initialization_or_destruction (TREE_VALUE (node),
2731 TREE_PURPOSE (node), initp);
2733 /* Finish up the priority if-stmt body. */
2734 finish_then_clause (priority_if_stmt);
2735 finish_if_stmt (priority_if_stmt);
2739 /* Finish up the init/destruct if-stmt body. */
2740 finish_then_clause (init_if_stmt);
2741 finish_if_stmt (init_if_stmt);
2744 /* VARS is a list of variables with static storage duration which may
2745 need initialization and/or finalization. Remove those variables
2746 that don't really need to be initialized or finalized, and return
2747 the resulting list. The order in which the variables appear in
2748 VARS is in reverse order of the order in which they should actually
2749 be initialized. The list we return is in the unreversed order;
2750 i.e., the first variable should be initialized first. */
2753 prune_vars_needing_no_initialization (tree *vars)
2756 tree result = NULL_TREE;
2761 tree decl = TREE_VALUE (t);
2762 tree init = TREE_PURPOSE (t);
2764 /* Deal gracefully with error. */
2765 if (decl == error_mark_node)
2767 var = &TREE_CHAIN (t);
2771 /* The only things that can be initialized are variables. */
2772 gcc_assert (TREE_CODE (decl) == VAR_DECL);
2774 /* If this object is not defined, we don't need to do anything
2776 if (DECL_EXTERNAL (decl))
2778 var = &TREE_CHAIN (t);
2782 /* Also, if the initializer already contains errors, we can bail
2784 if (init && TREE_CODE (init) == TREE_LIST
2785 && value_member (error_mark_node, init))
2787 var = &TREE_CHAIN (t);
2791 /* This variable is going to need initialization and/or
2792 finalization, so we add it to the list. */
2793 *var = TREE_CHAIN (t);
2794 TREE_CHAIN (t) = result;
2801 /* Make sure we have told the back end about all the variables in
2805 write_out_vars (tree vars)
2809 for (v = vars; v; v = TREE_CHAIN (v))
2811 tree var = TREE_VALUE (v);
2812 if (!var_finalized_p (var))
2814 import_export_decl (var);
2815 rest_of_decl_compilation (var, 1, 1);
2820 /* Generate a static constructor (if CONSTRUCTOR_P) or destructor
2821 (otherwise) that will initialize all gobal objects with static
2822 storage duration having the indicated PRIORITY. */
2825 generate_ctor_or_dtor_function (bool constructor_p, int priority,
2834 input_location = *locus;
2835 #ifdef USE_MAPPED_LOCATION
2841 /* We use `I' to indicate initialization and `D' to indicate
2843 function_key = constructor_p ? 'I' : 'D';
2845 /* We emit the function lazily, to avoid generating empty
2846 global constructors and destructors. */
2849 /* For Objective-C++, we may need to initialize metadata found in this module.
2850 This must be done _before_ any other static initializations. */
2851 if (c_dialect_objc () && (priority == DEFAULT_INIT_PRIORITY)
2852 && constructor_p && objc_static_init_needed_p ())
2854 body = start_objects (function_key, priority);
2855 static_ctors = objc_generate_static_init_call (static_ctors);
2858 /* Call the static storage duration function with appropriate
2860 for (i = 0; VEC_iterate (tree, ssdf_decls, i, fndecl); ++i)
2862 /* Calls to pure or const functions will expand to nothing. */
2863 if (! (flags_from_decl_or_type (fndecl) & (ECF_CONST | ECF_PURE)))
2866 body = start_objects (function_key, priority);
2868 arguments = tree_cons (NULL_TREE,
2869 build_int_cst (NULL_TREE, priority),
2871 arguments = tree_cons (NULL_TREE,
2872 build_int_cst (NULL_TREE, constructor_p),
2874 finish_expr_stmt (build_function_call (fndecl, arguments));
2878 /* If we're generating code for the DEFAULT_INIT_PRIORITY, throw in
2879 calls to any functions marked with attributes indicating that
2880 they should be called at initialization- or destruction-time. */
2881 if (priority == DEFAULT_INIT_PRIORITY)
2885 for (fns = constructor_p ? static_ctors : static_dtors;
2887 fns = TREE_CHAIN (fns))
2889 fndecl = TREE_VALUE (fns);
2891 /* Calls to pure/const functions will expand to nothing. */
2892 if (! (flags_from_decl_or_type (fndecl) & (ECF_CONST | ECF_PURE)))
2895 body = start_objects (function_key, priority);
2896 finish_expr_stmt (build_function_call (fndecl, NULL_TREE));
2901 /* Close out the function. */
2903 finish_objects (function_key, priority, body);
2906 /* Generate constructor and destructor functions for the priority
2910 generate_ctor_and_dtor_functions_for_priority (splay_tree_node n, void * data)
2912 location_t *locus = (location_t *) data;
2913 int priority = (int) n->key;
2914 priority_info pi = (priority_info) n->value;
2916 /* Generate the functions themselves, but only if they are really
2918 if (pi->initializations_p
2919 || (priority == DEFAULT_INIT_PRIORITY && static_ctors))
2920 generate_ctor_or_dtor_function (/*constructor_p=*/true, priority, locus);
2921 if (pi->destructions_p
2922 || (priority == DEFAULT_INIT_PRIORITY && static_dtors))
2923 generate_ctor_or_dtor_function (/*constructor_p=*/false, priority, locus);
2925 /* Keep iterating. */
2929 /* Called via LANGHOOK_CALLGRAPH_ANALYZE_EXPR. It is supposed to mark
2930 decls referenced from frontend specific constructs; it will be called
2931 only for language-specific tree nodes.
2933 Here we must deal with member pointers. */
2936 cxx_callgraph_analyze_expr (tree *tp, int *walk_subtrees ATTRIBUTE_UNUSED,
2937 tree from ATTRIBUTE_UNUSED)
2941 switch (TREE_CODE (t))
2944 if (TYPE_PTRMEMFUNC_P (TREE_TYPE (t)))
2945 cgraph_mark_needed_node (cgraph_node (PTRMEM_CST_MEMBER (t)));
2948 if (TREE_CODE (BASELINK_FUNCTIONS (t)) == FUNCTION_DECL)
2949 cgraph_mark_needed_node (cgraph_node (BASELINK_FUNCTIONS (t)));
2952 if (DECL_VTABLE_OR_VTT_P (t))
2954 /* The ABI requires that all virtual tables be emitted
2955 whenever one of them is. */
2957 for (vtbl = CLASSTYPE_VTABLES (DECL_CONTEXT (t));
2959 vtbl = TREE_CHAIN (vtbl))
2960 mark_decl_referenced (vtbl);
2962 else if (DECL_CONTEXT (t)
2963 && TREE_CODE (DECL_CONTEXT (t)) == FUNCTION_DECL)
2964 /* If we need a static variable in a function, then we
2965 need the containing function. */
2966 mark_decl_referenced (DECL_CONTEXT (t));
2975 /* Java requires that we be able to reference a local address for a
2976 method, and not be confused by PLT entries. If hidden aliases are
2977 supported, emit one for each java function that we've emitted. */
2980 build_java_method_aliases (void)
2982 struct cgraph_node *node;
2984 #ifndef HAVE_GAS_HIDDEN
2988 for (node = cgraph_nodes; node ; node = node->next)
2990 tree fndecl = node->decl;
2992 if (TREE_ASM_WRITTEN (fndecl)
2993 && DECL_CONTEXT (fndecl)
2994 && TYPE_P (DECL_CONTEXT (fndecl))
2995 && TYPE_FOR_JAVA (DECL_CONTEXT (fndecl))
2996 && TARGET_USE_LOCAL_THUNK_ALIAS_P (fndecl))
2998 /* Mangle the name in a predictable way; we need to reference
2999 this from a java compiled object file. */
3000 tree oid, nid, alias;
3004 oid = DECL_ASSEMBLER_NAME (fndecl);
3005 oname = IDENTIFIER_POINTER (oid);
3006 gcc_assert (oname[0] == '_' && oname[1] == 'Z');
3007 nname = ACONCAT (("_ZGA", oname+2, NULL));
3008 nid = get_identifier (nname);
3010 alias = make_alias_for (fndecl, nid);
3011 TREE_PUBLIC (alias) = 1;
3012 DECL_VISIBILITY (alias) = VISIBILITY_HIDDEN;
3014 assemble_alias (alias, oid);
3019 /* This routine is called from the last rule in yyparse ().
3020 Its job is to create all the code needed to initialize and
3021 destroy the global aggregates. We do the destruction
3022 first, since that way we only need to reverse the decls once. */
3025 cp_finish_file (void)
3031 unsigned ssdf_count = 0;
3035 locus = input_location;
3038 /* Bad parse errors. Just forget about it. */
3039 if (! global_bindings_p () || current_class_type || decl_namespace_list)
3043 c_common_write_pch ();
3045 #ifdef USE_MAPPED_LOCATION
3048 /* Otherwise, GDB can get confused, because in only knows
3049 about source for LINENO-1 lines. */
3053 /* We now have to write out all the stuff we put off writing out.
3056 o Template specializations that we have not yet instantiated,
3057 but which are needed.
3058 o Initialization and destruction for non-local objects with
3059 static storage duration. (Local objects with static storage
3060 duration are initialized when their scope is first entered,
3061 and are cleaned up via atexit.)
3062 o Virtual function tables.
3064 All of these may cause others to be needed. For example,
3065 instantiating one function may cause another to be needed, and
3066 generating the initializer for an object may cause templates to be
3067 instantiated, etc., etc. */
3069 timevar_push (TV_VARCONST);
3071 emit_support_tinfos ();
3080 /* If there are templates that we've put off instantiating, do
3082 instantiate_pending_templates (retries);
3085 /* Write out virtual tables as required. Note that writing out
3086 the virtual table for a template class may cause the
3087 instantiation of members of that class. If we write out
3088 vtables then we remove the class from our list so we don't
3089 have to look at it again. */
3091 while (keyed_classes != NULL_TREE
3092 && maybe_emit_vtables (TREE_VALUE (keyed_classes)))
3095 keyed_classes = TREE_CHAIN (keyed_classes);
3101 tree next = TREE_CHAIN (t);
3105 if (maybe_emit_vtables (TREE_VALUE (next)))
3108 TREE_CHAIN (t) = TREE_CHAIN (next);
3113 next = TREE_CHAIN (t);
3117 /* Write out needed type info variables. We have to be careful
3118 looping through unemitted decls, because emit_tinfo_decl may
3119 cause other variables to be needed. New elements will be
3120 appended, and we remove from the vector those that actually
3122 for (i = VEC_length (tree, unemitted_tinfo_decls);
3123 VEC_iterate (tree, unemitted_tinfo_decls, --i, t);)
3124 if (emit_tinfo_decl (t))
3127 VEC_unordered_remove (tree, unemitted_tinfo_decls, i);
3130 /* The list of objects with static storage duration is built up
3131 in reverse order. We clear STATIC_AGGREGATES so that any new
3132 aggregates added during the initialization of these will be
3133 initialized in the correct order when we next come around the
3135 vars = prune_vars_needing_no_initialization (&static_aggregates);
3139 /* We need to start a new initialization function each time
3140 through the loop. That's because we need to know which
3141 vtables have been referenced, and TREE_SYMBOL_REFERENCED
3142 isn't computed until a function is finished, and written
3143 out. That's a deficiency in the back-end. When this is
3144 fixed, these initialization functions could all become
3145 inline, with resulting performance improvements. */
3148 /* Set the line and file, so that it is obviously not from
3150 input_location = locus;
3151 ssdf_body = start_static_storage_duration_function (ssdf_count);
3153 /* Make sure the back end knows about all the variables. */
3154 write_out_vars (vars);
3156 /* First generate code to do all the initializations. */
3158 do_static_initialization_or_destruction (vars, /*initp=*/true);
3160 /* Then, generate code to do all the destructions. Do these
3161 in reverse order so that the most recently constructed
3162 variable is the first destroyed. If we're using
3163 __cxa_atexit, then we don't need to do this; functions
3164 were registered at initialization time to destroy the
3166 if (!flag_use_cxa_atexit && vars)
3168 vars = nreverse (vars);
3169 do_static_initialization_or_destruction (vars, /*initp=*/false);
3174 /* Finish up the static storage duration function for this
3176 input_location = locus;
3177 finish_static_storage_duration_function (ssdf_body);
3179 /* All those initializations and finalizations might cause
3180 us to need more inline functions, more template
3181 instantiations, etc. */
3184 #ifdef USE_MAPPED_LOCATION
3191 /* Go through the set of inline functions whose bodies have not
3192 been emitted yet. If out-of-line copies of these functions
3193 are required, emit them. */
3194 for (i = 0; VEC_iterate (tree, deferred_fns, i, decl); ++i)
3196 /* Does it need synthesizing? */
3197 if (DECL_ARTIFICIAL (decl) && ! DECL_INITIAL (decl)
3198 && (! DECL_REALLY_EXTERN (decl) || DECL_INLINE (decl)))
3200 /* Even though we're already at the top-level, we push
3201 there again. That way, when we pop back a few lines
3202 hence, all of our state is restored. Otherwise,
3203 finish_function doesn't clean things up, and we end
3204 up with CURRENT_FUNCTION_DECL set. */
3205 push_to_top_level ();
3206 /* The decl's location will mark where it was first
3207 needed. Save that so synthesize method can indicate
3208 where it was needed from, in case of error */
3209 input_location = DECL_SOURCE_LOCATION (decl);
3210 synthesize_method (decl);
3211 pop_from_top_level ();
3215 if (!DECL_SAVED_TREE (decl))
3218 /* We lie to the back-end, pretending that some functions
3219 are not defined when they really are. This keeps these
3220 functions from being put out unnecessarily. But, we must
3221 stop lying when the functions are referenced, or if they
3222 are not comdat since they need to be put out now. If
3223 DECL_INTERFACE_KNOWN, then we have already set
3224 DECL_EXTERNAL appropriately, so there's no need to check
3225 again, and we do not want to clear DECL_EXTERNAL if a
3226 previous call to import_export_decl set it.
3228 This is done in a separate for cycle, because if some
3229 deferred function is contained in another deferred
3230 function later in deferred_fns varray,
3231 rest_of_compilation would skip this function and we
3232 really cannot expand the same function twice. */
3233 import_export_decl (decl);
3234 if (DECL_NOT_REALLY_EXTERN (decl)
3235 && DECL_INITIAL (decl)
3236 && decl_needed_p (decl))
3237 DECL_EXTERNAL (decl) = 0;
3239 /* If we're going to need to write this function out, and
3240 there's already a body for it, create RTL for it now.
3241 (There might be no body if this is a method we haven't
3242 gotten around to synthesizing yet.) */
3243 if (!DECL_EXTERNAL (decl)
3244 && decl_needed_p (decl)
3245 && !TREE_ASM_WRITTEN (decl)
3246 && !cgraph_node (decl)->local.finalized)
3248 /* We will output the function; no longer consider it in this
3250 DECL_DEFER_OUTPUT (decl) = 0;
3251 /* Generate RTL for this function now that we know we
3253 expand_or_defer_fn (decl);
3254 /* If we're compiling -fsyntax-only pretend that this
3255 function has been written out so that we don't try to
3257 if (flag_syntax_only)
3258 TREE_ASM_WRITTEN (decl) = 1;
3263 if (walk_namespaces (wrapup_globals_for_namespace, /*data=*/0))
3266 /* Static data members are just like namespace-scope globals. */
3267 for (i = 0; VEC_iterate (tree, pending_statics, i, decl); ++i)
3269 if (var_finalized_p (decl) || DECL_REALLY_EXTERN (decl))
3271 import_export_decl (decl);
3272 /* If this static data member is needed, provide it to the
3274 if (DECL_NOT_REALLY_EXTERN (decl) && decl_needed_p (decl))
3275 DECL_EXTERNAL (decl) = 0;
3277 if (VEC_length (tree, pending_statics) != 0
3278 && wrapup_global_declarations (VEC_address (tree, pending_statics),
3279 VEC_length (tree, pending_statics)))
3286 /* All used inline functions must have a definition at this point. */
3287 for (i = 0; VEC_iterate (tree, deferred_fns, i, decl); ++i)
3289 if (/* Check online inline functions that were actually used. */
3290 TREE_USED (decl) && DECL_DECLARED_INLINE_P (decl)
3291 /* If the definition actually was available here, then the
3292 fact that the function was not defined merely represents
3293 that for some reason (use of a template repository,
3294 #pragma interface, etc.) we decided not to emit the
3296 && !DECL_INITIAL (decl)
3297 /* An explicit instantiation can be used to specify
3298 that the body is in another unit. It will have
3299 already verified there was a definition. */
3300 && !DECL_EXPLICIT_INSTANTIATION (decl))
3302 warning (0, "inline function %q+D used but never defined", decl);
3303 /* Avoid a duplicate warning from check_global_declaration_1. */
3304 TREE_NO_WARNING (decl) = 1;
3308 /* We give C linkage to static constructors and destructors. */
3309 push_lang_context (lang_name_c);
3311 /* Generate initialization and destruction functions for all
3312 priorities for which they are required. */
3313 if (priority_info_map)
3314 splay_tree_foreach (priority_info_map,
3315 generate_ctor_and_dtor_functions_for_priority,
3319 /* If we have a ctor or this is obj-c++ and we need a static init,
3320 call generate_ctor_or_dtor_function. */
3321 if (static_ctors || (c_dialect_objc () && objc_static_init_needed_p ()))
3322 generate_ctor_or_dtor_function (/*constructor_p=*/true,
3323 DEFAULT_INIT_PRIORITY, &locus);
3325 generate_ctor_or_dtor_function (/*constructor_p=*/false,
3326 DEFAULT_INIT_PRIORITY, &locus);
3329 /* We're done with the splay-tree now. */
3330 if (priority_info_map)
3331 splay_tree_delete (priority_info_map);
3333 /* Generate any missing aliases. */
3334 maybe_apply_pending_pragma_weaks ();
3336 /* We're done with static constructors, so we can go back to "C++"
3338 pop_lang_context ();
3340 cgraph_finalize_compilation_unit ();
3343 /* Now, issue warnings about static, but not defined, functions,
3344 etc., and emit debugging information. */
3345 walk_namespaces (wrapup_globals_for_namespace, /*data=*/&reconsider);
3346 if (VEC_length (tree, pending_statics) != 0)
3348 check_global_declarations (VEC_address (tree, pending_statics),
3349 VEC_length (tree, pending_statics));
3350 emit_debug_global_declarations (VEC_address (tree, pending_statics),
3351 VEC_length (tree, pending_statics));
3354 /* Generate hidden aliases for Java. */
3355 build_java_method_aliases ();
3359 /* The entire file is now complete. If requested, dump everything
3363 FILE *stream = dump_begin (TDI_tu, &flags);
3367 dump_node (global_namespace, flags & ~TDF_SLIM, stream);
3368 dump_end (TDI_tu, stream);
3372 timevar_pop (TV_VARCONST);
3374 if (flag_detailed_statistics)
3376 dump_tree_statistics ();
3377 dump_time_statistics ();
3379 input_location = locus;
3381 #ifdef ENABLE_CHECKING
3382 validate_conversion_obstack ();
3383 #endif /* ENABLE_CHECKING */
3386 /* FN is an OFFSET_REF, DOTSTAR_EXPR or MEMBER_REF indicating the
3387 function to call in parse-tree form; it has not yet been
3388 semantically analyzed. ARGS are the arguments to the function.
3389 They have already been semantically analyzed. */
3392 build_offset_ref_call_from_tree (tree fn, tree args)
3401 object = TREE_OPERAND (fn, 0);
3403 if (processing_template_decl)
3405 gcc_assert (TREE_CODE (fn) == DOTSTAR_EXPR
3406 || TREE_CODE (fn) == MEMBER_REF);
3407 if (type_dependent_expression_p (fn)
3408 || any_type_dependent_arguments_p (args))
3409 return build_min_nt (CALL_EXPR, fn, args, NULL_TREE);
3411 /* Transform the arguments and add the implicit "this"
3412 parameter. That must be done before the FN is transformed
3413 because we depend on the form of FN. */
3414 args = build_non_dependent_args (args);
3415 if (TREE_CODE (fn) == DOTSTAR_EXPR)
3416 object = build_unary_op (ADDR_EXPR, object, 0);
3417 object = build_non_dependent_expr (object);
3418 args = tree_cons (NULL_TREE, object, args);
3419 /* Now that the arguments are done, transform FN. */
3420 fn = build_non_dependent_expr (fn);
3423 /* A qualified name corresponding to a bound pointer-to-member is
3424 represented as an OFFSET_REF:
3426 struct B { void g(); };
3428 void B::g() { (this->*p)(); } */
3429 if (TREE_CODE (fn) == OFFSET_REF)
3431 tree object_addr = build_unary_op (ADDR_EXPR, object, 0);
3432 fn = TREE_OPERAND (fn, 1);
3433 fn = get_member_function_from_ptrfunc (&object_addr, fn);
3434 args = tree_cons (NULL_TREE, object_addr, args);
3437 expr = build_function_call (fn, args);
3438 if (processing_template_decl && expr != error_mark_node)
3439 return build_min_non_dep (CALL_EXPR, expr, orig_fn, orig_args, NULL_TREE);
3445 check_default_args (tree x)
3447 tree arg = TYPE_ARG_TYPES (TREE_TYPE (x));
3448 bool saw_def = false;
3449 int i = 0 - (TREE_CODE (TREE_TYPE (x)) == METHOD_TYPE);
3450 for (; arg && arg != void_list_node; arg = TREE_CHAIN (arg), ++i)
3452 if (TREE_PURPOSE (arg))
3456 error ("default argument missing for parameter %P of %q+#D", i, x);
3457 TREE_PURPOSE (arg) = error_mark_node;
3462 /* Mark DECL (either a _DECL or a BASELINK) as "used" in the program.
3463 If DECL is a specialization or implicitly declared class member,
3464 generate the actual definition. */
3467 mark_used (tree decl)
3469 HOST_WIDE_INT saved_processing_template_decl = 0;
3471 /* If DECL is a BASELINK for a single function, then treat it just
3472 like the DECL for the function. Otherwise, if the BASELINK is
3473 for an overloaded function, we don't know which function was
3474 actually used until after overload resolution. */
3475 if (TREE_CODE (decl) == BASELINK)
3477 decl = BASELINK_FUNCTIONS (decl);
3478 if (really_overloaded_fn (decl))
3480 decl = OVL_CURRENT (decl);
3483 TREE_USED (decl) = 1;
3484 /* If we don't need a value, then we don't need to synthesize DECL. */
3485 if (skip_evaluation)
3487 /* Normally, we can wait until instantiation-time to synthesize
3488 DECL. However, if DECL is a static data member initialized with
3489 a constant, we need the value right now because a reference to
3490 such a data member is not value-dependent. */
3491 if (TREE_CODE (decl) == VAR_DECL
3492 && DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl)
3493 && DECL_CLASS_SCOPE_P (decl))
3495 /* Don't try to instantiate members of dependent types. We
3496 cannot just use dependent_type_p here because this function
3497 may be called from fold_non_dependent_expr, and then we may
3498 see dependent types, even though processing_template_decl
3500 if (CLASSTYPE_TEMPLATE_INFO ((DECL_CONTEXT (decl)))
3501 && uses_template_parms (CLASSTYPE_TI_ARGS (DECL_CONTEXT (decl))))
3503 /* Pretend that we are not in a template, even if we are, so
3504 that the static data member initializer will be processed. */
3505 saved_processing_template_decl = processing_template_decl;
3506 processing_template_decl = 0;
3509 if (processing_template_decl)
3512 if (TREE_CODE (decl) == FUNCTION_DECL && DECL_DECLARED_INLINE_P (decl)
3513 && !TREE_ASM_WRITTEN (decl))
3514 /* Remember it, so we can check it was defined. */
3516 if (DECL_DEFERRED_FN (decl))
3519 /* Remember the current location for a function we will end up
3520 synthesizing. Then we can inform the user where it was
3521 required in the case of error. */
3522 if (DECL_ARTIFICIAL (decl) && DECL_NONSTATIC_MEMBER_FUNCTION_P (decl)
3523 && !DECL_THUNK_P (decl))
3524 DECL_SOURCE_LOCATION (decl) = input_location;
3526 note_vague_linkage_fn (decl);
3529 assemble_external (decl);
3531 /* Is it a synthesized method that needs to be synthesized? */
3532 if (TREE_CODE (decl) == FUNCTION_DECL
3533 && DECL_NONSTATIC_MEMBER_FUNCTION_P (decl)
3534 && DECL_ARTIFICIAL (decl)
3535 && !DECL_THUNK_P (decl)
3536 && ! DECL_INITIAL (decl)
3537 /* Kludge: don't synthesize for default args. Unfortunately this
3538 rules out initializers of namespace-scoped objects too, but
3539 it's sort-of ok if the implicit ctor or dtor decl keeps
3540 pointing to the class location. */
3541 && current_function_decl)
3543 synthesize_method (decl);
3544 /* If we've already synthesized the method we don't need to
3545 do the instantiation test below. */
3547 else if ((DECL_NON_THUNK_FUNCTION_P (decl) || TREE_CODE (decl) == VAR_DECL)
3548 && DECL_LANG_SPECIFIC (decl) && DECL_TEMPLATE_INFO (decl)
3549 && (!DECL_EXPLICIT_INSTANTIATION (decl)
3550 || (TREE_CODE (decl) == FUNCTION_DECL
3551 && DECL_INLINE (DECL_TEMPLATE_RESULT
3552 (template_for_substitution (decl))))
3553 /* We need to instantiate static data members so that there
3554 initializers are available in integral constant
3556 || (TREE_CODE (decl) == VAR_DECL
3557 && DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl))))
3558 /* If this is a function or variable that is an instance of some
3559 template, we now know that we will need to actually do the
3560 instantiation. We check that DECL is not an explicit
3561 instantiation because that is not checked in instantiate_decl.
3563 We put off instantiating functions in order to improve compile
3564 times. Maintaining a stack of active functions is expensive,
3565 and the inliner knows to instantiate any functions it might
3566 need. Therefore, we always try to defer instantiation. */
3567 instantiate_decl (decl, /*defer_ok=*/true,
3568 /*expl_inst_class_mem_p=*/false);
3570 processing_template_decl = saved_processing_template_decl;
3573 #include "gt-cp-decl2.h"