1 /* Process declarations and variables for C++ compiler.
2 Copyright (C) 1988, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
3 1999, 2000, 2001, 2002, 2003, 2004, 2005 Free Software Foundation, Inc.
4 Hacked by Michael Tiemann (tiemann@cygnus.com)
6 This file is part of GCC.
8 GCC is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2, or (at your option)
13 GCC is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with GCC; see the file COPYING. If not, write to
20 the Free Software Foundation, 51 Franklin Street, Fifth Floor,
21 Boston, MA 02110-1301, USA. */
24 /* Process declarations and symbol lookup for C++ front end.
25 Also constructs types; the standard scalar types at initialization,
26 and structure, union, array and enum types when they are declared. */
28 /* ??? not all decl nodes are given the most useful possible
29 line numbers. For example, the CONST_DECLs for enum values. */
33 #include "coretypes.h"
48 #include "tree-mudflap.h"
50 #include "tree-inline.h"
52 #include "tree-dump.h"
55 extern cpp_reader *parse_in;
57 /* This structure contains information about the initializations
58 and/or destructions required for a particular priority level. */
59 typedef struct priority_info_s {
60 /* Nonzero if there have been any initializations at this priority
61 throughout the translation unit. */
62 int initializations_p;
63 /* Nonzero if there have been any destructions at this priority
64 throughout the translation unit. */
68 static void mark_vtable_entries (tree);
69 static bool maybe_emit_vtables (tree);
70 static bool acceptable_java_type (tree);
71 static tree start_objects (int, int);
72 static void finish_objects (int, int, tree);
73 static tree start_static_storage_duration_function (unsigned);
74 static void finish_static_storage_duration_function (tree);
75 static priority_info get_priority_info (int);
76 static void do_static_initialization_or_destruction (tree, bool);
77 static void one_static_initialization_or_destruction (tree, tree, bool);
78 static void generate_ctor_or_dtor_function (bool, int, location_t *);
79 static int generate_ctor_and_dtor_functions_for_priority (splay_tree_node,
81 static tree prune_vars_needing_no_initialization (tree *);
82 static void write_out_vars (tree);
83 static void import_export_class (tree);
84 static tree get_guard_bits (tree);
85 static void determine_visibility_from_class (tree, tree);
87 /* A list of static class variables. This is needed, because a
88 static class variable can be declared inside the class without
89 an initializer, and then initialized, statically, outside the class. */
90 static GTY(()) VEC(tree,gc) *pending_statics;
92 /* A list of functions which were declared inline, but which we
93 may need to emit outline anyway. */
94 static GTY(()) VEC(tree,gc) *deferred_fns;
96 /* Nonzero if we're done parsing and into end-of-file activities. */
100 /* Functions called along with real static constructors and destructors. */
107 /* Return a member function type (a METHOD_TYPE), given FNTYPE (a
108 FUNCTION_TYPE), CTYPE (class type), and QUALS (the cv-qualifiers
109 that apply to the function). */
112 build_memfn_type (tree fntype, tree ctype, cp_cv_quals quals)
117 if (fntype == error_mark_node || ctype == error_mark_node)
118 return error_mark_node;
120 type_quals = quals & ~TYPE_QUAL_RESTRICT;
121 ctype = cp_build_qualified_type (ctype, type_quals);
122 fntype = build_method_type_directly (ctype, TREE_TYPE (fntype),
123 (TREE_CODE (fntype) == METHOD_TYPE
124 ? TREE_CHAIN (TYPE_ARG_TYPES (fntype))
125 : TYPE_ARG_TYPES (fntype)));
126 raises = TYPE_RAISES_EXCEPTIONS (fntype);
128 fntype = build_exception_variant (fntype, raises);
133 /* Build a PARM_DECL with NAME and TYPE, and set DECL_ARG_TYPE
137 cp_build_parm_decl (tree name, tree type)
139 tree parm = build_decl (PARM_DECL, name, type);
140 /* DECL_ARG_TYPE is only used by the back end and the back end never
142 if (!processing_template_decl)
143 DECL_ARG_TYPE (parm) = type_passed_as (type);
147 /* Returns a PARM_DECL for a parameter of the indicated TYPE, with the
151 build_artificial_parm (tree name, tree type)
153 tree parm = cp_build_parm_decl (name, type);
154 DECL_ARTIFICIAL (parm) = 1;
155 /* All our artificial parms are implicitly `const'; they cannot be
157 TREE_READONLY (parm) = 1;
161 /* Constructors for types with virtual baseclasses need an "in-charge" flag
162 saying whether this constructor is responsible for initialization of
163 virtual baseclasses or not. All destructors also need this "in-charge"
164 flag, which additionally determines whether or not the destructor should
165 free the memory for the object.
167 This function adds the "in-charge" flag to member function FN if
168 appropriate. It is called from grokclassfn and tsubst.
169 FN must be either a constructor or destructor.
171 The in-charge flag follows the 'this' parameter, and is followed by the
172 VTT parm (if any), then the user-written parms. */
175 maybe_retrofit_in_chrg (tree fn)
177 tree basetype, arg_types, parms, parm, fntype;
179 /* If we've already add the in-charge parameter don't do it again. */
180 if (DECL_HAS_IN_CHARGE_PARM_P (fn))
183 /* When processing templates we can't know, in general, whether or
184 not we're going to have virtual baseclasses. */
185 if (processing_template_decl)
188 /* We don't need an in-charge parameter for constructors that don't
189 have virtual bases. */
190 if (DECL_CONSTRUCTOR_P (fn)
191 && !CLASSTYPE_VBASECLASSES (DECL_CONTEXT (fn)))
194 arg_types = TYPE_ARG_TYPES (TREE_TYPE (fn));
195 basetype = TREE_TYPE (TREE_VALUE (arg_types));
196 arg_types = TREE_CHAIN (arg_types);
198 parms = TREE_CHAIN (DECL_ARGUMENTS (fn));
200 /* If this is a subobject constructor or destructor, our caller will
201 pass us a pointer to our VTT. */
202 if (CLASSTYPE_VBASECLASSES (DECL_CONTEXT (fn)))
204 parm = build_artificial_parm (vtt_parm_identifier, vtt_parm_type);
206 /* First add it to DECL_ARGUMENTS between 'this' and the real args... */
207 TREE_CHAIN (parm) = parms;
210 /* ...and then to TYPE_ARG_TYPES. */
211 arg_types = hash_tree_chain (vtt_parm_type, arg_types);
213 DECL_HAS_VTT_PARM_P (fn) = 1;
216 /* Then add the in-charge parm (before the VTT parm). */
217 parm = build_artificial_parm (in_charge_identifier, integer_type_node);
218 TREE_CHAIN (parm) = parms;
220 arg_types = hash_tree_chain (integer_type_node, arg_types);
222 /* Insert our new parameter(s) into the list. */
223 TREE_CHAIN (DECL_ARGUMENTS (fn)) = parms;
225 /* And rebuild the function type. */
226 fntype = build_method_type_directly (basetype, TREE_TYPE (TREE_TYPE (fn)),
228 if (TYPE_RAISES_EXCEPTIONS (TREE_TYPE (fn)))
229 fntype = build_exception_variant (fntype,
230 TYPE_RAISES_EXCEPTIONS (TREE_TYPE (fn)));
231 TREE_TYPE (fn) = fntype;
233 /* Now we've got the in-charge parameter. */
234 DECL_HAS_IN_CHARGE_PARM_P (fn) = 1;
237 /* Classes overload their constituent function names automatically.
238 When a function name is declared in a record structure,
239 its name is changed to it overloaded name. Since names for
240 constructors and destructors can conflict, we place a leading
243 CNAME is the name of the class we are grokking for.
245 FUNCTION is a FUNCTION_DECL. It was created by `grokdeclarator'.
247 FLAGS contains bits saying what's special about today's
248 arguments. 1 == DESTRUCTOR. 2 == OPERATOR.
250 If FUNCTION is a destructor, then we must add the `auto-delete' field
251 as a second parameter. There is some hair associated with the fact
252 that we must "declare" this variable in the manner consistent with the
253 way the rest of the arguments were declared.
255 QUALS are the qualifiers for the this pointer. */
258 grokclassfn (tree ctype, tree function, enum overload_flags flags)
260 tree fn_name = DECL_NAME (function);
262 /* Even within an `extern "C"' block, members get C++ linkage. See
263 [dcl.link] for details. */
264 SET_DECL_LANGUAGE (function, lang_cplusplus);
266 if (fn_name == NULL_TREE)
268 error ("name missing for member function");
269 fn_name = get_identifier ("<anonymous>");
270 DECL_NAME (function) = fn_name;
273 DECL_CONTEXT (function) = ctype;
275 if (flags == DTOR_FLAG)
276 DECL_DESTRUCTOR_P (function) = 1;
278 if (flags == DTOR_FLAG || DECL_CONSTRUCTOR_P (function))
279 maybe_retrofit_in_chrg (function);
282 /* Create an ARRAY_REF, checking for the user doing things backwards
286 grok_array_decl (tree array_expr, tree index_exp)
290 tree orig_array_expr = array_expr;
291 tree orig_index_exp = index_exp;
293 if (error_operand_p (array_expr) || error_operand_p (index_exp))
294 return error_mark_node;
296 if (processing_template_decl)
298 if (type_dependent_expression_p (array_expr)
299 || type_dependent_expression_p (index_exp))
300 return build_min_nt (ARRAY_REF, array_expr, index_exp,
301 NULL_TREE, NULL_TREE);
302 array_expr = build_non_dependent_expr (array_expr);
303 index_exp = build_non_dependent_expr (index_exp);
306 type = TREE_TYPE (array_expr);
308 type = non_reference (type);
310 /* If they have an `operator[]', use that. */
311 if (IS_AGGR_TYPE (type) || IS_AGGR_TYPE (TREE_TYPE (index_exp)))
312 expr = build_new_op (ARRAY_REF, LOOKUP_NORMAL,
313 array_expr, index_exp, NULL_TREE,
314 /*overloaded_p=*/NULL);
319 /* Otherwise, create an ARRAY_REF for a pointer or array type.
320 It is a little-known fact that, if `a' is an array and `i' is
321 an int, you can write `i[a]', which means the same thing as
323 if (TREE_CODE (type) == ARRAY_TYPE)
326 p1 = build_expr_type_conversion (WANT_POINTER, array_expr, false);
328 if (TREE_CODE (TREE_TYPE (index_exp)) == ARRAY_TYPE)
331 p2 = build_expr_type_conversion (WANT_POINTER, index_exp, false);
333 i1 = build_expr_type_conversion (WANT_INT | WANT_ENUM, array_expr,
335 i2 = build_expr_type_conversion (WANT_INT | WANT_ENUM, index_exp,
338 if ((p1 && i2) && (i1 && p2))
339 error ("ambiguous conversion for array subscript");
342 array_expr = p1, index_exp = i2;
344 array_expr = p2, index_exp = i1;
347 error ("invalid types %<%T[%T]%> for array subscript",
348 type, TREE_TYPE (index_exp));
349 return error_mark_node;
352 if (array_expr == error_mark_node || index_exp == error_mark_node)
353 error ("ambiguous conversion for array subscript");
355 expr = build_array_ref (array_expr, index_exp);
357 if (processing_template_decl && expr != error_mark_node)
358 return build_min_non_dep (ARRAY_REF, expr, orig_array_expr, orig_index_exp,
359 NULL_TREE, NULL_TREE);
363 /* Given the cast expression EXP, checking out its validity. Either return
364 an error_mark_node if there was an unavoidable error, return a cast to
365 void for trying to delete a pointer w/ the value 0, or return the
366 call to delete. If DOING_VEC is true, we handle things differently
367 for doing an array delete.
368 Implements ARM $5.3.4. This is called from the parser. */
371 delete_sanity (tree exp, tree size, bool doing_vec, int use_global_delete)
375 if (exp == error_mark_node)
378 if (processing_template_decl)
380 t = build_min (DELETE_EXPR, void_type_node, exp, size);
381 DELETE_EXPR_USE_GLOBAL (t) = use_global_delete;
382 DELETE_EXPR_USE_VEC (t) = doing_vec;
383 TREE_SIDE_EFFECTS (t) = 1;
387 /* An array can't have been allocated by new, so complain. */
388 if (TREE_CODE (exp) == VAR_DECL
389 && TREE_CODE (TREE_TYPE (exp)) == ARRAY_TYPE)
390 warning (0, "deleting array %q#D", exp);
392 t = build_expr_type_conversion (WANT_POINTER, exp, true);
394 if (t == NULL_TREE || t == error_mark_node)
396 error ("type %q#T argument given to %<delete%>, expected pointer",
398 return error_mark_node;
401 type = TREE_TYPE (t);
403 /* As of Valley Forge, you can delete a pointer to const. */
405 /* You can't delete functions. */
406 if (TREE_CODE (TREE_TYPE (type)) == FUNCTION_TYPE)
408 error ("cannot delete a function. Only pointer-to-objects are "
409 "valid arguments to %<delete%>");
410 return error_mark_node;
413 /* Deleting ptr to void is undefined behavior [expr.delete/3]. */
414 if (TREE_CODE (TREE_TYPE (type)) == VOID_TYPE)
416 warning (0, "deleting %qT is undefined", type);
420 /* Deleting a pointer with the value zero is valid and has no effect. */
421 if (integer_zerop (t))
422 return build1 (NOP_EXPR, void_type_node, t);
425 return build_vec_delete (t, /*maxindex=*/NULL_TREE,
426 sfk_deleting_destructor,
429 return build_delete (type, t, sfk_deleting_destructor,
430 LOOKUP_NORMAL, use_global_delete);
433 /* Report an error if the indicated template declaration is not the
434 sort of thing that should be a member template. */
437 check_member_template (tree tmpl)
441 gcc_assert (TREE_CODE (tmpl) == TEMPLATE_DECL);
442 decl = DECL_TEMPLATE_RESULT (tmpl);
444 if (TREE_CODE (decl) == FUNCTION_DECL
445 || (TREE_CODE (decl) == TYPE_DECL
446 && IS_AGGR_TYPE (TREE_TYPE (decl))))
448 if (current_function_decl)
449 /* 14.5.2.2 [temp.mem]
451 A local class shall not have member templates. */
452 error ("invalid declaration of member template %q#D in local class",
455 /* The parser rejects any use of virtual in a function template. */
456 gcc_assert (!(TREE_CODE (decl) == FUNCTION_DECL
457 && DECL_VIRTUAL_P (decl)));
459 /* The debug-information generating code doesn't know what to do
460 with member templates. */
461 DECL_IGNORED_P (tmpl) = 1;
464 error ("template declaration of %q#D", decl);
467 /* Return true iff TYPE is a valid Java parameter or return type. */
470 acceptable_java_type (tree type)
472 if (type == error_mark_node)
475 if (TREE_CODE (type) == VOID_TYPE || TYPE_FOR_JAVA (type))
477 if (TREE_CODE (type) == POINTER_TYPE || TREE_CODE (type) == REFERENCE_TYPE)
479 type = TREE_TYPE (type);
480 if (TREE_CODE (type) == RECORD_TYPE)
483 if (! TYPE_FOR_JAVA (type))
485 if (! CLASSTYPE_TEMPLATE_INFO (type))
487 args = CLASSTYPE_TI_ARGS (type);
488 i = TREE_VEC_LENGTH (args);
491 type = TREE_VEC_ELT (args, i);
492 if (TREE_CODE (type) == POINTER_TYPE)
493 type = TREE_TYPE (type);
494 if (! TYPE_FOR_JAVA (type))
503 /* For a METHOD in a Java class CTYPE, return true if
504 the parameter and return types are valid Java types.
505 Otherwise, print appropriate error messages, and return false. */
508 check_java_method (tree method)
511 tree arg_types = TYPE_ARG_TYPES (TREE_TYPE (method));
512 tree ret_type = TREE_TYPE (TREE_TYPE (method));
514 if (!acceptable_java_type (ret_type))
516 error ("Java method %qD has non-Java return type %qT",
521 arg_types = TREE_CHAIN (arg_types);
522 if (DECL_HAS_IN_CHARGE_PARM_P (method))
523 arg_types = TREE_CHAIN (arg_types);
524 if (DECL_HAS_VTT_PARM_P (method))
525 arg_types = TREE_CHAIN (arg_types);
527 for (; arg_types != NULL_TREE; arg_types = TREE_CHAIN (arg_types))
529 tree type = TREE_VALUE (arg_types);
530 if (!acceptable_java_type (type))
532 if (type != error_mark_node)
533 error ("Java method %qD has non-Java parameter type %qT",
541 /* Sanity check: report error if this function FUNCTION is not
542 really a member of the class (CTYPE) it is supposed to belong to.
543 TEMPLATE_PARMS is used to specify the template parameters of a member
544 template passed as FUNCTION_DECL. If the member template is passed as a
545 TEMPLATE_DECL, it can be NULL since the parameters can be extracted
546 from the declaration. If the function is not a function template, it
548 It returns the original declaration for the function, or NULL_TREE
549 if no declaration was found (and an error was emitted). */
552 check_classfn (tree ctype, tree function, tree template_parms)
557 if (DECL_USE_TEMPLATE (function)
558 && !(TREE_CODE (function) == TEMPLATE_DECL
559 && DECL_TEMPLATE_SPECIALIZATION (function))
560 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (function)))
561 /* Since this is a specialization of a member template,
562 we're not going to find the declaration in the class.
565 struct S { template <typename T> void f(T); };
566 template <> void S::f(int);
568 we're not going to find `S::f(int)', but there's no
569 reason we should, either. We let our callers know we didn't
570 find the method, but we don't complain. */
573 /* Basic sanity check: for a template function, the template parameters
574 either were not passed, or they are the same of DECL_TEMPLATE_PARMS. */
575 if (TREE_CODE (function) == TEMPLATE_DECL)
577 gcc_assert (!template_parms
578 || comp_template_parms (template_parms,
579 DECL_TEMPLATE_PARMS (function)));
580 template_parms = DECL_TEMPLATE_PARMS (function);
583 /* OK, is this a definition of a member template? */
584 is_template = (template_parms != NULL_TREE);
586 ix = class_method_index_for_fn (complete_type (ctype), function);
589 VEC(tree,gc) *methods = CLASSTYPE_METHOD_VEC (ctype);
590 tree fndecls, fndecl = 0;
593 const char *format = NULL;
595 pushed_scope = push_scope (ctype);
596 for (fndecls = VEC_index (tree, methods, ix);
597 fndecls; fndecls = OVL_NEXT (fndecls))
601 fndecl = OVL_CURRENT (fndecls);
602 p1 = TYPE_ARG_TYPES (TREE_TYPE (function));
603 p2 = TYPE_ARG_TYPES (TREE_TYPE (fndecl));
605 /* We cannot simply call decls_match because this doesn't
606 work for static member functions that are pretending to
607 be methods, and because the name may have been changed by
610 /* Get rid of the this parameter on functions that become
612 if (DECL_STATIC_FUNCTION_P (fndecl)
613 && TREE_CODE (TREE_TYPE (function)) == METHOD_TYPE)
614 p1 = TREE_CHAIN (p1);
616 /* A member template definition only matches a member template
618 if (is_template != (TREE_CODE (fndecl) == TEMPLATE_DECL))
621 if (same_type_p (TREE_TYPE (TREE_TYPE (function)),
622 TREE_TYPE (TREE_TYPE (fndecl)))
623 && compparms (p1, p2)
625 || comp_template_parms (template_parms,
626 DECL_TEMPLATE_PARMS (fndecl)))
627 && (DECL_TEMPLATE_SPECIALIZATION (function)
628 == DECL_TEMPLATE_SPECIALIZATION (fndecl))
629 && (!DECL_TEMPLATE_SPECIALIZATION (function)
630 || (DECL_TI_TEMPLATE (function)
631 == DECL_TI_TEMPLATE (fndecl))))
635 pop_scope (pushed_scope);
637 return OVL_CURRENT (fndecls);
638 error ("prototype for %q#D does not match any in class %qT",
640 is_conv_op = DECL_CONV_FN_P (fndecl);
643 ix = CLASSTYPE_FIRST_CONVERSION_SLOT;
644 fndecls = VEC_index (tree, methods, ix);
647 fndecl = OVL_CURRENT (fndecls);
648 fndecls = OVL_NEXT (fndecls);
650 if (!fndecls && is_conv_op)
652 if (VEC_length (tree, methods) > (size_t) ++ix)
654 fndecls = VEC_index (tree, methods, ix);
655 if (!DECL_CONV_FN_P (OVL_CURRENT (fndecls)))
667 format = N_("candidates are: %+#D");
669 format = N_("candidate is: %+#D");
670 error (format, fndecl);
673 else if (!COMPLETE_TYPE_P (ctype))
674 cxx_incomplete_type_error (function, ctype);
677 error ("no %q#D member function declared in class %qT",
682 /* If we did not find the method in the class, add it to avoid
683 spurious errors (unless the CTYPE is not yet defined, in which
684 case we'll only confuse ourselves when the function is declared
685 properly within the class. */
686 if (COMPLETE_TYPE_P (ctype))
687 add_method (ctype, function, NULL_TREE);
691 /* DECL is a function with vague linkage. Remember it so that at the
692 end of the translation unit we can decide whether or not to emit
696 note_vague_linkage_fn (tree decl)
698 if (!DECL_DEFERRED_FN (decl))
700 DECL_DEFERRED_FN (decl) = 1;
701 DECL_DEFER_OUTPUT (decl) = 1;
702 VEC_safe_push (tree, gc, deferred_fns, decl);
706 /* We have just processed the DECL, which is a static data member.
707 The other parameters are as for cp_finish_decl. */
710 finish_static_data_member_decl (tree decl,
711 tree init, bool init_const_expr_p,
715 DECL_CONTEXT (decl) = current_class_type;
717 /* We cannot call pushdecl here, because that would fill in the
718 TREE_CHAIN of our decl. Instead, we modify cp_finish_decl to do
719 the right thing, namely, to put this decl out straight away. */
721 if (! processing_template_decl)
722 VEC_safe_push (tree, gc, pending_statics, decl);
724 if (LOCAL_CLASS_P (current_class_type))
725 pedwarn ("local class %q#T shall not have static data member %q#D",
726 current_class_type, decl);
728 /* Static consts need not be initialized in the class definition. */
729 if (init != NULL_TREE && TYPE_NEEDS_CONSTRUCTING (TREE_TYPE (decl)))
731 static int explained = 0;
733 error ("initializer invalid for static member with constructor");
736 error ("(an out of class initialization is required)");
741 /* Force the compiler to know when an uninitialized static const
742 member is being used. */
743 if (CP_TYPE_CONST_P (TREE_TYPE (decl)) && init == 0)
744 TREE_USED (decl) = 1;
745 DECL_INITIAL (decl) = init;
746 DECL_IN_AGGR_P (decl) = 1;
748 cp_finish_decl (decl, init, init_const_expr_p, asmspec_tree, flags);
751 /* DECLARATOR and DECLSPECS correspond to a class member. The other
752 parameters are as for cp_finish_decl. Return the DECL for the
753 class member declared. */
756 grokfield (const cp_declarator *declarator,
757 cp_decl_specifier_seq *declspecs,
758 tree init, bool init_const_expr_p,
763 const char *asmspec = 0;
764 int flags = LOOKUP_ONLYCONVERTING;
766 if (!declspecs->any_specifiers_p
767 && declarator->kind == cdk_id
768 && declarator->u.id.qualifying_scope
769 && TYPE_P (declarator->u.id.qualifying_scope)
770 && IS_AGGR_TYPE (declarator->u.id.qualifying_scope)
771 && TREE_CODE (declarator->u.id.unqualified_name) == IDENTIFIER_NODE)
772 /* Access declaration */
773 return do_class_using_decl (declarator->u.id.qualifying_scope,
774 declarator->u.id.unqualified_name);
777 && TREE_CODE (init) == TREE_LIST
778 && TREE_VALUE (init) == error_mark_node
779 && TREE_CHAIN (init) == NULL_TREE)
782 value = grokdeclarator (declarator, declspecs, FIELD, init != 0, &attrlist);
783 if (! value || error_operand_p (value))
784 /* friend or constructor went bad. */
785 return error_mark_node;
787 if (TREE_CODE (value) == TYPE_DECL && init)
789 error ("typedef %qD is initialized (use __typeof__ instead)", value);
793 /* Pass friendly classes back. */
794 if (value == void_type_node)
797 /* Pass friend decls back. */
798 if ((TREE_CODE (value) == FUNCTION_DECL
799 || TREE_CODE (value) == TEMPLATE_DECL)
800 && DECL_CONTEXT (value) != current_class_type)
803 if (DECL_NAME (value) != NULL_TREE
804 && IDENTIFIER_POINTER (DECL_NAME (value))[0] == '_'
805 && ! strcmp (IDENTIFIER_POINTER (DECL_NAME (value)), "_vptr"))
806 error ("member %qD conflicts with virtual function table field name",
809 /* Stash away type declarations. */
810 if (TREE_CODE (value) == TYPE_DECL)
812 DECL_NONLOCAL (value) = 1;
813 DECL_CONTEXT (value) = current_class_type;
815 if (processing_template_decl)
816 value = push_template_decl (value);
820 /* Avoid storing attributes in template parameters:
821 tsubst is not ready to handle them. */
822 tree type = TREE_TYPE (value);
823 if (TREE_CODE (type) == TEMPLATE_TYPE_PARM
824 || TREE_CODE (type) == BOUND_TEMPLATE_TEMPLATE_PARM)
825 sorry ("applying attributes to template parameters is not implemented");
827 cplus_decl_attributes (&value, attrlist, 0);
833 if (DECL_IN_AGGR_P (value))
835 error ("%qD is already defined in %qT", value, DECL_CONTEXT (value));
836 return void_type_node;
839 if (asmspec_tree && asmspec_tree != error_mark_node)
840 asmspec = TREE_STRING_POINTER (asmspec_tree);
844 if (TREE_CODE (value) == FUNCTION_DECL)
846 /* Initializers for functions are rejected early in the parser.
847 If we get here, it must be a pure specifier for a method. */
848 if (TREE_CODE (TREE_TYPE (value)) == METHOD_TYPE)
850 gcc_assert (error_operand_p (init) || integer_zerop (init));
851 DECL_PURE_VIRTUAL_P (value) = 1;
855 gcc_assert (TREE_CODE (TREE_TYPE (value)) == FUNCTION_TYPE);
856 error ("initializer specified for static member function %qD",
860 else if (pedantic && TREE_CODE (value) != VAR_DECL)
861 /* Already complained in grokdeclarator. */
863 else if (!processing_template_decl)
865 if (TREE_CODE (init) == CONSTRUCTOR)
866 init = digest_init (TREE_TYPE (value), init);
868 init = integral_constant_value (init);
870 if (init != error_mark_node && !TREE_CONSTANT (init))
872 /* We can allow references to things that are effectively
873 static, since references are initialized with the
875 if (TREE_CODE (TREE_TYPE (value)) != REFERENCE_TYPE
876 || (TREE_STATIC (init) == 0
877 && (!DECL_P (init) || DECL_EXTERNAL (init) == 0)))
879 error ("field initializer is not constant");
880 init = error_mark_node;
886 if (processing_template_decl
887 && (TREE_CODE (value) == VAR_DECL || TREE_CODE (value) == FUNCTION_DECL))
889 value = push_template_decl (value);
890 if (error_operand_p (value))
891 return error_mark_node;
895 cplus_decl_attributes (&value, attrlist, 0);
897 switch (TREE_CODE (value))
900 finish_static_data_member_decl (value, init, init_const_expr_p,
901 asmspec_tree, flags);
906 error ("%<asm%> specifiers are not permitted on non-static data members");
907 if (DECL_INITIAL (value) == error_mark_node)
908 init = error_mark_node;
909 cp_finish_decl (value, init, /*init_const_expr_p=*/false,
911 DECL_INITIAL (value) = init;
912 DECL_IN_AGGR_P (value) = 1;
917 set_user_assembler_name (value, asmspec);
919 cp_finish_decl (value,
921 /*init_const_expr_p=*/false,
922 asmspec_tree, flags);
924 /* Pass friends back this way. */
925 if (DECL_FRIEND_P (value))
926 return void_type_node;
928 DECL_IN_AGGR_P (value) = 1;
937 /* Like `grokfield', but for bitfields.
938 WIDTH is non-NULL for bit fields only, and is an INTEGER_CST node. */
941 grokbitfield (const cp_declarator *declarator,
942 cp_decl_specifier_seq *declspecs, tree width)
944 tree value = grokdeclarator (declarator, declspecs, BITFIELD, 0, NULL);
946 if (value == error_mark_node)
947 return NULL_TREE; /* friends went bad. */
949 /* Pass friendly classes back. */
950 if (TREE_CODE (value) == VOID_TYPE)
951 return void_type_node;
953 if (TREE_CODE (value) == TYPE_DECL)
955 error ("cannot declare %qD to be a bit-field type", value);
959 /* Usually, finish_struct_1 catches bitfields with invalid types.
960 But, in the case of bitfields with function type, we confuse
961 ourselves into thinking they are member functions, so we must
963 if (TREE_CODE (value) == FUNCTION_DECL)
965 error ("cannot declare bit-field %qD with function type",
970 if (DECL_IN_AGGR_P (value))
972 error ("%qD is already defined in the class %qT", value,
973 DECL_CONTEXT (value));
974 return void_type_node;
977 if (TREE_STATIC (value))
979 error ("static member %qD cannot be a bit-field", value);
982 finish_decl (value, NULL_TREE, NULL_TREE);
984 if (width != error_mark_node)
986 constant_expression_warning (width);
987 DECL_INITIAL (value) = width;
988 SET_DECL_C_BIT_FIELD (value);
991 DECL_IN_AGGR_P (value) = 1;
997 cplus_decl_attributes (tree *decl, tree attributes, int flags)
999 if (*decl == NULL_TREE || *decl == void_type_node
1000 || *decl == error_mark_node)
1003 if (TREE_CODE (*decl) == TEMPLATE_DECL)
1004 decl = &DECL_TEMPLATE_RESULT (*decl);
1006 decl_attributes (decl, attributes, flags);
1008 if (TREE_CODE (*decl) == TYPE_DECL)
1009 SET_IDENTIFIER_TYPE_VALUE (DECL_NAME (*decl), TREE_TYPE (*decl));
1012 /* Walks through the namespace- or function-scope anonymous union
1013 OBJECT, with the indicated TYPE, building appropriate VAR_DECLs.
1014 Returns one of the fields for use in the mangled name. */
1017 build_anon_union_vars (tree type, tree object)
1019 tree main_decl = NULL_TREE;
1022 /* Rather than write the code to handle the non-union case,
1023 just give an error. */
1024 if (TREE_CODE (type) != UNION_TYPE)
1025 error ("anonymous struct not inside named type");
1027 for (field = TYPE_FIELDS (type);
1029 field = TREE_CHAIN (field))
1034 if (DECL_ARTIFICIAL (field))
1036 if (TREE_CODE (field) != FIELD_DECL)
1038 pedwarn ("%q+#D invalid; an anonymous union can only "
1039 "have non-static data members", field);
1043 if (TREE_PRIVATE (field))
1044 pedwarn ("private member %q+#D in anonymous union", field);
1045 else if (TREE_PROTECTED (field))
1046 pedwarn ("protected member %q+#D in anonymous union", field);
1048 if (processing_template_decl)
1049 ref = build_min_nt (COMPONENT_REF, object,
1050 DECL_NAME (field), NULL_TREE);
1052 ref = build_class_member_access_expr (object, field, NULL_TREE,
1055 if (DECL_NAME (field))
1059 decl = build_decl (VAR_DECL, DECL_NAME (field), TREE_TYPE (field));
1061 base = get_base_address (object);
1062 TREE_PUBLIC (decl) = TREE_PUBLIC (base);
1063 TREE_STATIC (decl) = TREE_STATIC (base);
1064 DECL_EXTERNAL (decl) = DECL_EXTERNAL (base);
1066 SET_DECL_VALUE_EXPR (decl, ref);
1067 DECL_HAS_VALUE_EXPR_P (decl) = 1;
1069 decl = pushdecl (decl);
1071 else if (ANON_AGGR_TYPE_P (TREE_TYPE (field)))
1072 decl = build_anon_union_vars (TREE_TYPE (field), ref);
1076 if (main_decl == NULL_TREE)
1083 /* Finish off the processing of a UNION_TYPE structure. If the union is an
1084 anonymous union, then all members must be laid out together. PUBLIC_P
1085 is nonzero if this union is not declared static. */
1088 finish_anon_union (tree anon_union_decl)
1094 if (anon_union_decl == error_mark_node)
1097 type = TREE_TYPE (anon_union_decl);
1098 public_p = TREE_PUBLIC (anon_union_decl);
1100 /* The VAR_DECL's context is the same as the TYPE's context. */
1101 DECL_CONTEXT (anon_union_decl) = DECL_CONTEXT (TYPE_NAME (type));
1103 if (TYPE_FIELDS (type) == NULL_TREE)
1108 error ("namespace-scope anonymous aggregates must be static");
1112 main_decl = build_anon_union_vars (type, anon_union_decl);
1113 if (main_decl == error_mark_node)
1115 if (main_decl == NULL_TREE)
1117 warning (0, "anonymous union with no members");
1121 if (!processing_template_decl)
1123 /* Use main_decl to set the mangled name. */
1124 DECL_NAME (anon_union_decl) = DECL_NAME (main_decl);
1125 mangle_decl (anon_union_decl);
1126 DECL_NAME (anon_union_decl) = NULL_TREE;
1129 pushdecl (anon_union_decl);
1130 if (building_stmt_tree ()
1131 && at_function_scope_p ())
1132 add_decl_expr (anon_union_decl);
1133 else if (!processing_template_decl)
1134 rest_of_decl_compilation (anon_union_decl,
1135 toplevel_bindings_p (), at_eof);
1138 /* Auxiliary functions to make type signatures for
1139 `operator new' and `operator delete' correspond to
1140 what compiler will be expecting. */
1143 coerce_new_type (tree type)
1146 tree args = TYPE_ARG_TYPES (type);
1148 gcc_assert (TREE_CODE (type) == FUNCTION_TYPE);
1150 if (!same_type_p (TREE_TYPE (type), ptr_type_node))
1153 error ("%<operator new%> must return type %qT", ptr_type_node);
1156 if (!args || args == void_list_node
1157 || !same_type_p (TREE_VALUE (args), size_type_node))
1160 if (args && args != void_list_node)
1161 args = TREE_CHAIN (args);
1162 pedwarn ("%<operator new%> takes type %<size_t%> (%qT) "
1163 "as first parameter", size_type_node);
1168 args = tree_cons (NULL_TREE, size_type_node, args);
1171 type = build_exception_variant
1172 (build_function_type (ptr_type_node, args),
1173 TYPE_RAISES_EXCEPTIONS (type));
1181 coerce_delete_type (tree type)
1184 tree args = TYPE_ARG_TYPES (type);
1186 gcc_assert (TREE_CODE (type) == FUNCTION_TYPE);
1188 if (!same_type_p (TREE_TYPE (type), void_type_node))
1191 error ("%<operator delete%> must return type %qT", void_type_node);
1194 if (!args || args == void_list_node
1195 || !same_type_p (TREE_VALUE (args), ptr_type_node))
1198 if (args && args != void_list_node)
1199 args = TREE_CHAIN (args);
1200 error ("%<operator delete%> takes type %qT as first parameter",
1206 args = tree_cons (NULL_TREE, ptr_type_node, args);
1209 type = build_exception_variant
1210 (build_function_type (void_type_node, args),
1211 TYPE_RAISES_EXCEPTIONS (type));
1220 mark_vtable_entries (tree decl)
1223 unsigned HOST_WIDE_INT idx;
1225 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (DECL_INITIAL (decl)),
1230 STRIP_NOPS (fnaddr);
1232 if (TREE_CODE (fnaddr) != ADDR_EXPR
1233 && TREE_CODE (fnaddr) != FDESC_EXPR)
1234 /* This entry is an offset: a virtual base class offset, a
1235 virtual call offset, an RTTI offset, etc. */
1238 fn = TREE_OPERAND (fnaddr, 0);
1239 TREE_ADDRESSABLE (fn) = 1;
1240 /* When we don't have vcall offsets, we output thunks whenever
1241 we output the vtables that contain them. With vcall offsets,
1242 we know all the thunks we'll need when we emit a virtual
1243 function, so we emit the thunks there instead. */
1244 if (DECL_THUNK_P (fn))
1245 use_thunk (fn, /*emit_p=*/0);
1250 /* Set DECL up to have the closest approximation of "initialized common"
1251 linkage available. */
1254 comdat_linkage (tree decl)
1257 make_decl_one_only (decl);
1258 else if (TREE_CODE (decl) == FUNCTION_DECL
1259 || (TREE_CODE (decl) == VAR_DECL && DECL_ARTIFICIAL (decl)))
1260 /* We can just emit function and compiler-generated variables
1261 statically; having multiple copies is (for the most part) only
1264 There are two correctness issues, however: the address of a
1265 template instantiation with external linkage should be the
1266 same, independent of what translation unit asks for the
1267 address, and this will not hold when we emit multiple copies of
1268 the function. However, there's little else we can do.
1270 Also, by default, the typeinfo implementation assumes that
1271 there will be only one copy of the string used as the name for
1272 each type. Therefore, if weak symbols are unavailable, the
1273 run-time library should perform a more conservative check; it
1274 should perform a string comparison, rather than an address
1276 TREE_PUBLIC (decl) = 0;
1279 /* Static data member template instantiations, however, cannot
1280 have multiple copies. */
1281 if (DECL_INITIAL (decl) == 0
1282 || DECL_INITIAL (decl) == error_mark_node)
1283 DECL_COMMON (decl) = 1;
1284 else if (EMPTY_CONSTRUCTOR_P (DECL_INITIAL (decl)))
1286 DECL_COMMON (decl) = 1;
1287 DECL_INITIAL (decl) = error_mark_node;
1289 else if (!DECL_EXPLICIT_INSTANTIATION (decl))
1291 /* We can't do anything useful; leave vars for explicit
1293 DECL_EXTERNAL (decl) = 1;
1294 DECL_NOT_REALLY_EXTERN (decl) = 0;
1298 if (DECL_LANG_SPECIFIC (decl))
1299 DECL_COMDAT (decl) = 1;
1302 /* For win32 we also want to put explicit instantiations in
1303 linkonce sections, so that they will be merged with implicit
1304 instantiations; otherwise we get duplicate symbol errors.
1305 For Darwin we do not want explicit instantiations to be
1309 maybe_make_one_only (tree decl)
1311 /* We used to say that this was not necessary on targets that support weak
1312 symbols, because the implicit instantiations will defer to the explicit
1313 one. However, that's not actually the case in SVR4; a strong definition
1314 after a weak one is an error. Also, not making explicit
1315 instantiations one_only means that we can end up with two copies of
1316 some template instantiations. */
1320 /* We can't set DECL_COMDAT on functions, or cp_finish_file will think
1321 we can get away with not emitting them if they aren't used. We need
1322 to for variables so that cp_finish_decl will update their linkage,
1323 because their DECL_INITIAL may not have been set properly yet. */
1325 if (!TARGET_WEAK_NOT_IN_ARCHIVE_TOC
1326 || (! DECL_EXPLICIT_INSTANTIATION (decl)
1327 && ! DECL_TEMPLATE_SPECIALIZATION (decl)))
1329 make_decl_one_only (decl);
1331 if (TREE_CODE (decl) == VAR_DECL)
1333 DECL_COMDAT (decl) = 1;
1334 /* Mark it needed so we don't forget to emit it. */
1335 mark_decl_referenced (decl);
1340 /* Determine whether or not we want to specifically import or export CTYPE,
1341 using various heuristics. */
1344 import_export_class (tree ctype)
1346 /* -1 for imported, 1 for exported. */
1347 int import_export = 0;
1349 /* It only makes sense to call this function at EOF. The reason is
1350 that this function looks at whether or not the first non-inline
1351 non-abstract virtual member function has been defined in this
1352 translation unit. But, we can't possibly know that until we've
1353 seen the entire translation unit. */
1354 gcc_assert (at_eof);
1356 if (CLASSTYPE_INTERFACE_KNOWN (ctype))
1359 /* If MULTIPLE_SYMBOL_SPACES is set and we saw a #pragma interface,
1360 we will have CLASSTYPE_INTERFACE_ONLY set but not
1361 CLASSTYPE_INTERFACE_KNOWN. In that case, we don't want to use this
1362 heuristic because someone will supply a #pragma implementation
1363 elsewhere, and deducing it here would produce a conflict. */
1364 if (CLASSTYPE_INTERFACE_ONLY (ctype))
1367 if (lookup_attribute ("dllimport", TYPE_ATTRIBUTES (ctype)))
1369 else if (lookup_attribute ("dllexport", TYPE_ATTRIBUTES (ctype)))
1371 else if (CLASSTYPE_IMPLICIT_INSTANTIATION (ctype)
1372 && !flag_implicit_templates)
1373 /* For a template class, without -fimplicit-templates, check the
1374 repository. If the virtual table is assigned to this
1375 translation unit, then export the class; otherwise, import
1377 import_export = repo_export_class_p (ctype) ? 1 : -1;
1378 else if (TYPE_POLYMORPHIC_P (ctype))
1380 /* The ABI specifies that the virtual table and associated
1381 information are emitted with the key method, if any. */
1382 tree method = CLASSTYPE_KEY_METHOD (ctype);
1383 /* If weak symbol support is not available, then we must be
1384 careful not to emit the vtable when the key function is
1385 inline. An inline function can be defined in multiple
1386 translation units. If we were to emit the vtable in each
1387 translation unit containing a definition, we would get
1388 multiple definition errors at link-time. */
1389 if (method && (flag_weak || ! DECL_DECLARED_INLINE_P (method)))
1390 import_export = (DECL_REALLY_EXTERN (method) ? -1 : 1);
1393 /* When MULTIPLE_SYMBOL_SPACES is set, we cannot count on seeing
1394 a definition anywhere else. */
1395 if (MULTIPLE_SYMBOL_SPACES && import_export == -1)
1398 /* Allow backends the chance to overrule the decision. */
1399 if (targetm.cxx.import_export_class)
1400 import_export = targetm.cxx.import_export_class (ctype, import_export);
1404 SET_CLASSTYPE_INTERFACE_KNOWN (ctype);
1405 CLASSTYPE_INTERFACE_ONLY (ctype) = (import_export < 0);
1409 /* Return true if VAR has already been provided to the back end; in that
1410 case VAR should not be modified further by the front end. */
1412 var_finalized_p (tree var)
1414 return cgraph_varpool_node (var)->finalized;
1417 /* DECL is a VAR_DECL or FUNCTION_DECL which, for whatever reason,
1418 must be emitted in this translation unit. Mark it as such. */
1421 mark_needed (tree decl)
1423 /* It's possible that we no longer need to set
1424 TREE_SYMBOL_REFERENCED here directly, but doing so is
1426 TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)) = 1;
1427 mark_decl_referenced (decl);
1430 /* DECL is either a FUNCTION_DECL or a VAR_DECL. This function
1431 returns true if a definition of this entity should be provided in
1432 this object file. Callers use this function to determine whether
1433 or not to let the back end know that a definition of DECL is
1434 available in this translation unit. */
1437 decl_needed_p (tree decl)
1439 gcc_assert (TREE_CODE (decl) == VAR_DECL
1440 || TREE_CODE (decl) == FUNCTION_DECL);
1441 /* This function should only be called at the end of the translation
1442 unit. We cannot be sure of whether or not something will be
1443 COMDAT until that point. */
1444 gcc_assert (at_eof);
1446 /* All entities with external linkage that are not COMDAT should be
1447 emitted; they may be referred to from other object files. */
1448 if (TREE_PUBLIC (decl) && !DECL_COMDAT (decl))
1450 /* If this entity was used, let the back-end see it; it will decide
1451 whether or not to emit it into the object file. */
1452 if (TREE_USED (decl)
1453 || (DECL_ASSEMBLER_NAME_SET_P (decl)
1454 && TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))))
1456 /* Otherwise, DECL does not need to be emitted -- yet. A subsequent
1457 reference to DECL might cause it to be emitted later. */
1461 /* If necessary, write out the vtables for the dynamic class CTYPE.
1462 Returns true if any vtables were emitted. */
1465 maybe_emit_vtables (tree ctype)
1471 /* If the vtables for this class have already been emitted there is
1472 nothing more to do. */
1473 primary_vtbl = CLASSTYPE_VTABLES (ctype);
1474 if (var_finalized_p (primary_vtbl))
1476 /* Ignore dummy vtables made by get_vtable_decl. */
1477 if (TREE_TYPE (primary_vtbl) == void_type_node)
1480 /* On some targets, we cannot determine the key method until the end
1481 of the translation unit -- which is when this function is
1483 if (!targetm.cxx.key_method_may_be_inline ())
1484 determine_key_method (ctype);
1486 /* See if any of the vtables are needed. */
1487 for (vtbl = CLASSTYPE_VTABLES (ctype); vtbl; vtbl = TREE_CHAIN (vtbl))
1489 import_export_decl (vtbl);
1490 if (DECL_NOT_REALLY_EXTERN (vtbl) && decl_needed_p (vtbl))
1495 /* If the references to this class' vtables are optimized away,
1496 still emit the appropriate debugging information. See
1498 if (DECL_COMDAT (primary_vtbl)
1499 && CLASSTYPE_DEBUG_REQUESTED (ctype))
1500 note_debug_info_needed (ctype);
1504 /* The ABI requires that we emit all of the vtables if we emit any
1506 for (vtbl = CLASSTYPE_VTABLES (ctype); vtbl; vtbl = TREE_CHAIN (vtbl))
1508 /* Mark entities references from the virtual table as used. */
1509 mark_vtable_entries (vtbl);
1511 if (TREE_TYPE (DECL_INITIAL (vtbl)) == 0)
1513 tree expr = store_init_value (vtbl, DECL_INITIAL (vtbl));
1515 /* It had better be all done at compile-time. */
1520 DECL_EXTERNAL (vtbl) = 0;
1521 rest_of_decl_compilation (vtbl, 1, 1);
1523 /* Because we're only doing syntax-checking, we'll never end up
1524 actually marking the variable as written. */
1525 if (flag_syntax_only)
1526 TREE_ASM_WRITTEN (vtbl) = 1;
1529 /* Since we're writing out the vtable here, also write the debug
1531 note_debug_info_needed (ctype);
1536 /* A special return value from type_visibility meaning internal
1539 enum { VISIBILITY_ANON = VISIBILITY_INTERNAL+1 };
1541 /* walk_tree helper function for type_visibility. */
1544 min_vis_r (tree *tp, int *walk_subtrees, void *data)
1546 int *vis_p = (int *)data;
1551 else if (CLASS_TYPE_P (*tp))
1553 if (!TREE_PUBLIC (TYPE_MAIN_DECL (*tp)))
1555 *vis_p = VISIBILITY_ANON;
1558 else if (CLASSTYPE_VISIBILITY (*tp) > *vis_p)
1559 *vis_p = CLASSTYPE_VISIBILITY (*tp);
1564 /* Returns the visibility of TYPE, which is the minimum visibility of its
1568 type_visibility (tree type)
1570 int vis = VISIBILITY_DEFAULT;
1571 walk_tree_without_duplicates (&type, min_vis_r, &vis);
1575 /* Limit the visibility of DECL to VISIBILITY, if not explicitly
1576 specified (or if VISIBILITY is static). */
1579 constrain_visibility (tree decl, int visibility)
1581 if (visibility == VISIBILITY_ANON)
1583 /* extern "C" declarations aren't affected by the anonymous
1585 if (!DECL_EXTERN_C_P (decl))
1587 TREE_PUBLIC (decl) = 0;
1588 DECL_INTERFACE_KNOWN (decl) = 1;
1589 if (DECL_LANG_SPECIFIC (decl))
1590 DECL_NOT_REALLY_EXTERN (decl) = 1;
1593 else if (visibility > DECL_VISIBILITY (decl)
1594 && !DECL_VISIBILITY_SPECIFIED (decl))
1596 DECL_VISIBILITY (decl) = visibility;
1602 /* Constrain the visibility of DECL based on the visibility of its template
1606 constrain_visibility_for_template (tree decl, tree targs)
1608 /* If this is a template instantiation, check the innermost
1609 template args for visibility constraints. The outer template
1610 args are covered by the class check. */
1611 tree args = INNERMOST_TEMPLATE_ARGS (targs);
1613 for (i = TREE_VEC_LENGTH (args); i > 0; --i)
1617 tree arg = TREE_VEC_ELT (args, i-1);
1619 vis = type_visibility (arg);
1620 else if (TREE_TYPE (arg) && POINTER_TYPE_P (TREE_TYPE (arg)))
1623 if (TREE_CODE (arg) == ADDR_EXPR)
1624 arg = TREE_OPERAND (arg, 0);
1625 if (TREE_CODE (arg) == VAR_DECL
1626 || TREE_CODE (arg) == FUNCTION_DECL)
1628 if (! TREE_PUBLIC (arg))
1629 vis = VISIBILITY_ANON;
1631 vis = DECL_VISIBILITY (arg);
1635 constrain_visibility (decl, vis);
1639 /* Like c_determine_visibility, but with additional C++-specific
1642 Function-scope entities can rely on the function's visibility because
1643 it is set in start_preparsed_function.
1645 Class-scope entities cannot rely on the class's visibility until the end
1646 of the enclosing class definition.
1648 Note that because namespaces have multiple independent definitions,
1649 namespace visibility is handled elsewhere using the #pragma visibility
1650 machinery rather than by decorating the namespace declaration.
1652 The goal is for constraints from the type to give a diagnostic, and
1653 other constraints to be applied silently. */
1656 determine_visibility (tree decl)
1658 tree class_type = NULL_TREE;
1661 /* Remember that all decls get VISIBILITY_DEFAULT when built. */
1663 /* Only relevant for names with external linkage. */
1664 if (!TREE_PUBLIC (decl))
1667 /* Cloned constructors and destructors get the same visibility as
1668 the underlying function. That should be set up in
1669 maybe_clone_body. */
1670 gcc_assert (!DECL_CLONED_FUNCTION_P (decl));
1672 if (TREE_CODE (decl) == TYPE_DECL)
1674 if (CLASS_TYPE_P (TREE_TYPE (decl)))
1675 use_template = CLASSTYPE_USE_TEMPLATE (TREE_TYPE (decl));
1676 else if (TYPE_TEMPLATE_INFO (TREE_TYPE (decl)))
1681 else if (DECL_LANG_SPECIFIC (decl))
1682 use_template = DECL_USE_TEMPLATE (decl);
1686 /* Anything that is exported must have default visibility. */
1687 if (TARGET_DLLIMPORT_DECL_ATTRIBUTES
1688 && lookup_attribute ("dllexport",
1689 TREE_CODE (decl) == TYPE_DECL
1690 ? TYPE_ATTRIBUTES (TREE_TYPE (decl))
1691 : DECL_ATTRIBUTES (decl)))
1693 DECL_VISIBILITY (decl) = VISIBILITY_DEFAULT;
1694 DECL_VISIBILITY_SPECIFIED (decl) = 1;
1697 /* If DECL is a member of a class, visibility specifiers on the
1698 class can influence the visibility of the DECL. */
1699 if (DECL_CLASS_SCOPE_P (decl))
1700 class_type = DECL_CONTEXT (decl);
1701 else if (TREE_CODE (decl) == VAR_DECL
1702 && DECL_TINFO_P (decl)
1703 && CLASS_TYPE_P (TREE_TYPE (DECL_NAME (decl))))
1704 class_type = TREE_TYPE (DECL_NAME (decl));
1707 /* Not a class member. */
1709 /* Virtual tables have DECL_CONTEXT set to their associated class,
1710 so they are automatically handled above. */
1711 gcc_assert (TREE_CODE (decl) != VAR_DECL
1712 || !DECL_VTABLE_OR_VTT_P (decl));
1714 if (DECL_FUNCTION_SCOPE_P (decl) && ! DECL_VISIBILITY_SPECIFIED (decl))
1716 /* Local statics and classes get the visibility of their
1717 containing function by default, except that
1718 -fvisibility-inlines-hidden doesn't affect them. */
1719 tree fn = DECL_CONTEXT (decl);
1720 if (DECL_VISIBILITY_SPECIFIED (fn) || ! DECL_CLASS_SCOPE_P (fn))
1722 DECL_VISIBILITY (decl) = DECL_VISIBILITY (fn);
1723 DECL_VISIBILITY_SPECIFIED (decl) =
1724 DECL_VISIBILITY_SPECIFIED (fn);
1727 determine_visibility_from_class (decl, DECL_CONTEXT (fn));
1729 /* Local classes in templates have CLASSTYPE_USE_TEMPLATE set,
1730 but have no TEMPLATE_INFO, so don't try to check it. */
1733 else if (TREE_CODE (decl) == VAR_DECL && DECL_TINFO_P (decl))
1735 /* tinfo visibility is based on the type it's for. */
1736 constrain_visibility
1737 (decl, type_visibility (TREE_TYPE (DECL_NAME (decl))));
1739 else if (use_template)
1740 /* Template instantiations and specializations get visibility based
1741 on their template unless they override it with an attribute. */;
1742 else if (! DECL_VISIBILITY_SPECIFIED (decl))
1744 /* Set default visibility to whatever the user supplied with
1745 #pragma GCC visibility or a namespace visibility attribute. */
1746 DECL_VISIBILITY (decl) = default_visibility;
1747 DECL_VISIBILITY_SPECIFIED (decl) = visibility_options.inpragma;
1753 /* If the specialization doesn't specify visibility, use the
1754 visibility from the template. */
1755 tree tinfo = (TREE_CODE (decl) == TYPE_DECL
1756 ? TYPE_TEMPLATE_INFO (TREE_TYPE (decl))
1757 : DECL_TEMPLATE_INFO (decl));
1758 tree args = TI_ARGS (tinfo);
1759 int depth = TMPL_ARGS_DEPTH (args);
1760 tree pattern = DECL_TEMPLATE_RESULT (TI_TEMPLATE (tinfo));
1762 if (!DECL_VISIBILITY_SPECIFIED (decl))
1764 DECL_VISIBILITY (decl) = DECL_VISIBILITY (pattern);
1765 DECL_VISIBILITY_SPECIFIED (decl)
1766 = DECL_VISIBILITY_SPECIFIED (pattern);
1769 /* FIXME should TMPL_ARGS_DEPTH really return 1 for null input? */
1770 if (args && depth > template_class_depth (class_type))
1771 /* Limit visibility based on its template arguments. */
1772 constrain_visibility_for_template (decl, args);
1776 determine_visibility_from_class (decl, class_type);
1778 if (decl_anon_ns_mem_p (decl))
1779 /* Names in an anonymous namespace get internal linkage.
1780 This might change once we implement export. */
1781 constrain_visibility (decl, VISIBILITY_ANON);
1782 else if (TREE_CODE (decl) != TYPE_DECL)
1784 /* Propagate anonymity from type to decl. */
1785 int tvis = type_visibility (TREE_TYPE (decl));
1786 if (tvis == VISIBILITY_ANON)
1787 constrain_visibility (decl, tvis);
1791 /* By default, static data members and function members receive
1792 the visibility of their containing class. */
1795 determine_visibility_from_class (tree decl, tree class_type)
1797 if (visibility_options.inlines_hidden
1798 /* Don't do this for inline templates; specializations might not be
1799 inline, and we don't want them to inherit the hidden
1800 visibility. We'll set it here for all inline instantiations. */
1801 && !processing_template_decl
1802 && ! DECL_VISIBILITY_SPECIFIED (decl)
1803 && TREE_CODE (decl) == FUNCTION_DECL
1804 && DECL_DECLARED_INLINE_P (decl)
1805 && (! DECL_LANG_SPECIFIC (decl)
1806 || ! DECL_EXPLICIT_INSTANTIATION (decl)))
1807 DECL_VISIBILITY (decl) = VISIBILITY_HIDDEN;
1808 else if (!DECL_VISIBILITY_SPECIFIED (decl))
1810 /* Default to the class visibility. */
1811 DECL_VISIBILITY (decl) = CLASSTYPE_VISIBILITY (class_type);
1812 DECL_VISIBILITY_SPECIFIED (decl)
1813 = CLASSTYPE_VISIBILITY_SPECIFIED (class_type);
1816 /* Give the target a chance to override the visibility associated
1818 if (TREE_CODE (decl) == VAR_DECL
1819 && (DECL_TINFO_P (decl)
1820 || (DECL_VTABLE_OR_VTT_P (decl)
1821 /* Construction virtual tables are not exported because
1822 they cannot be referred to from other object files;
1823 their name is not standardized by the ABI. */
1824 && !DECL_CONSTRUCTION_VTABLE_P (decl)))
1825 && TREE_PUBLIC (decl)
1826 && !DECL_REALLY_EXTERN (decl)
1827 && !DECL_VISIBILITY_SPECIFIED (decl)
1828 && !CLASSTYPE_VISIBILITY_SPECIFIED (class_type))
1829 targetm.cxx.determine_class_data_visibility (decl);
1832 /* Constrain the visibility of a class TYPE based on the visibility of its
1833 field types. Warn if any fields require lesser visibility. */
1836 constrain_class_visibility (tree type)
1842 int vis = type_visibility (type);
1844 if (vis == VISIBILITY_ANON
1845 || DECL_IN_SYSTEM_HEADER (TYPE_MAIN_DECL (type)))
1848 /* Don't warn about visibility if the class has explicit visibility. */
1849 if (CLASSTYPE_VISIBILITY_SPECIFIED (type))
1850 vis = VISIBILITY_INTERNAL;
1852 for (t = TYPE_FIELDS (type); t; t = TREE_CHAIN (t))
1853 if (TREE_CODE (t) == FIELD_DECL && TREE_TYPE (t) != error_mark_node)
1855 tree ftype = strip_array_types (TREE_TYPE (t));
1856 int subvis = type_visibility (ftype);
1858 if (subvis == VISIBILITY_ANON)
1860 %qT has a field %qD whose type uses the anonymous namespace",
1862 else if (IS_AGGR_TYPE (ftype)
1863 && vis < VISIBILITY_HIDDEN
1864 && subvis >= VISIBILITY_HIDDEN)
1865 warning (OPT_Wattributes, "\
1866 %qT declared with greater visibility than the type of its field %qD",
1870 binfo = TYPE_BINFO (type);
1871 for (i = 0; BINFO_BASE_ITERATE (binfo, i, t); ++i)
1873 int subvis = type_visibility (TREE_TYPE (t));
1875 if (subvis == VISIBILITY_ANON)
1877 %qT has a base %qT whose type uses the anonymous namespace",
1878 type, TREE_TYPE (t));
1879 else if (vis < VISIBILITY_HIDDEN
1880 && subvis >= VISIBILITY_HIDDEN)
1881 warning (OPT_Wattributes, "\
1882 %qT declared with greater visibility than its base %qT",
1883 type, TREE_TYPE (t));
1887 /* DECL is a FUNCTION_DECL or VAR_DECL. If the object file linkage
1888 for DECL has not already been determined, do so now by setting
1889 DECL_EXTERNAL, DECL_COMDAT and other related flags. Until this
1890 function is called entities with vague linkage whose definitions
1891 are available must have TREE_PUBLIC set.
1893 If this function decides to place DECL in COMDAT, it will set
1894 appropriate flags -- but will not clear DECL_EXTERNAL. It is up to
1895 the caller to decide whether or not to clear DECL_EXTERNAL. Some
1896 callers defer that decision until it is clear that DECL is actually
1900 import_export_decl (tree decl)
1905 tree class_type = NULL_TREE;
1907 if (DECL_INTERFACE_KNOWN (decl))
1910 /* We cannot determine what linkage to give to an entity with vague
1911 linkage until the end of the file. For example, a virtual table
1912 for a class will be defined if and only if the key method is
1913 defined in this translation unit. As a further example, consider
1914 that when compiling a translation unit that uses PCH file with
1915 "-frepo" it would be incorrect to make decisions about what
1916 entities to emit when building the PCH; those decisions must be
1917 delayed until the repository information has been processed. */
1918 gcc_assert (at_eof);
1919 /* Object file linkage for explicit instantiations is handled in
1920 mark_decl_instantiated. For static variables in functions with
1921 vague linkage, maybe_commonize_var is used.
1923 Therefore, the only declarations that should be provided to this
1924 function are those with external linkage that are:
1926 * implicit instantiations of function templates
1930 * implicit instantiations of static data members of class
1937 Furthermore, all entities that reach this point must have a
1938 definition available in this translation unit.
1940 The following assertions check these conditions. */
1941 gcc_assert (TREE_CODE (decl) == FUNCTION_DECL
1942 || TREE_CODE (decl) == VAR_DECL);
1943 /* Any code that creates entities with TREE_PUBLIC cleared should
1944 also set DECL_INTERFACE_KNOWN. */
1945 gcc_assert (TREE_PUBLIC (decl));
1946 if (TREE_CODE (decl) == FUNCTION_DECL)
1947 gcc_assert (DECL_IMPLICIT_INSTANTIATION (decl)
1948 || DECL_FRIEND_PSEUDO_TEMPLATE_INSTANTIATION (decl)
1949 || DECL_DECLARED_INLINE_P (decl));
1951 gcc_assert (DECL_IMPLICIT_INSTANTIATION (decl)
1952 || DECL_VTABLE_OR_VTT_P (decl)
1953 || DECL_TINFO_P (decl));
1954 /* Check that a definition of DECL is available in this translation
1956 gcc_assert (!DECL_REALLY_EXTERN (decl));
1958 /* Assume that DECL will not have COMDAT linkage. */
1960 /* Assume that DECL will not be imported into this translation
1964 /* See if the repository tells us whether or not to emit DECL in
1965 this translation unit. */
1966 emit_p = repo_emit_p (decl);
1969 else if (emit_p == 1)
1971 /* The repository indicates that this entity should be defined
1972 here. Make sure the back end honors that request. */
1973 if (TREE_CODE (decl) == VAR_DECL)
1975 else if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (decl)
1976 || DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P (decl))
1979 FOR_EACH_CLONE (clone, decl)
1980 mark_needed (clone);
1984 /* Output the definition as an ordinary strong definition. */
1985 DECL_EXTERNAL (decl) = 0;
1986 DECL_INTERFACE_KNOWN (decl) = 1;
1991 /* We have already decided what to do with this DECL; there is no
1992 need to check anything further. */
1994 else if (TREE_CODE (decl) == VAR_DECL && DECL_VTABLE_OR_VTT_P (decl))
1996 class_type = DECL_CONTEXT (decl);
1997 import_export_class (class_type);
1998 if (TYPE_FOR_JAVA (class_type))
2000 else if (CLASSTYPE_INTERFACE_KNOWN (class_type)
2001 && CLASSTYPE_INTERFACE_ONLY (class_type))
2003 else if ((!flag_weak || TARGET_WEAK_NOT_IN_ARCHIVE_TOC)
2004 && !CLASSTYPE_USE_TEMPLATE (class_type)
2005 && CLASSTYPE_KEY_METHOD (class_type)
2006 && !DECL_DECLARED_INLINE_P (CLASSTYPE_KEY_METHOD (class_type)))
2007 /* The ABI requires that all virtual tables be emitted with
2008 COMDAT linkage. However, on systems where COMDAT symbols
2009 don't show up in the table of contents for a static
2010 archive, or on systems without weak symbols (where we
2011 approximate COMDAT linkage by using internal linkage), the
2012 linker will report errors about undefined symbols because
2013 it will not see the virtual table definition. Therefore,
2014 in the case that we know that the virtual table will be
2015 emitted in only one translation unit, we make the virtual
2016 table an ordinary definition with external linkage. */
2017 DECL_EXTERNAL (decl) = 0;
2018 else if (CLASSTYPE_INTERFACE_KNOWN (class_type))
2020 /* CLASS_TYPE is being exported from this translation unit,
2021 so DECL should be defined here. */
2022 if (!flag_weak && CLASSTYPE_EXPLICIT_INSTANTIATION (class_type))
2023 /* If a class is declared in a header with the "extern
2024 template" extension, then it will not be instantiated,
2025 even in translation units that would normally require
2026 it. Often such classes are explicitly instantiated in
2027 one translation unit. Therefore, the explicit
2028 instantiation must be made visible to other translation
2030 DECL_EXTERNAL (decl) = 0;
2033 /* The generic C++ ABI says that class data is always
2034 COMDAT, even if there is a key function. Some
2035 variants (e.g., the ARM EABI) says that class data
2036 only has COMDAT linkage if the class data might be
2037 emitted in more than one translation unit. When the
2038 key method can be inline and is inline, we still have
2039 to arrange for comdat even though
2040 class_data_always_comdat is false. */
2041 if (!CLASSTYPE_KEY_METHOD (class_type)
2042 || DECL_DECLARED_INLINE_P (CLASSTYPE_KEY_METHOD (class_type))
2043 || targetm.cxx.class_data_always_comdat ())
2045 /* The ABI requires COMDAT linkage. Normally, we
2046 only emit COMDAT things when they are needed;
2047 make sure that we realize that this entity is
2054 else if (!flag_implicit_templates
2055 && CLASSTYPE_IMPLICIT_INSTANTIATION (class_type))
2060 else if (TREE_CODE (decl) == VAR_DECL && DECL_TINFO_P (decl))
2062 tree type = TREE_TYPE (DECL_NAME (decl));
2063 if (CLASS_TYPE_P (type))
2066 import_export_class (type);
2067 if (CLASSTYPE_INTERFACE_KNOWN (type)
2068 && TYPE_POLYMORPHIC_P (type)
2069 && CLASSTYPE_INTERFACE_ONLY (type)
2070 /* If -fno-rtti was specified, then we cannot be sure
2071 that RTTI information will be emitted with the
2072 virtual table of the class, so we must emit it
2073 wherever it is used. */
2078 if (CLASSTYPE_INTERFACE_KNOWN (type)
2079 && !CLASSTYPE_INTERFACE_ONLY (type))
2081 comdat_p = (targetm.cxx.class_data_always_comdat ()
2082 || (CLASSTYPE_KEY_METHOD (type)
2083 && DECL_DECLARED_INLINE_P (CLASSTYPE_KEY_METHOD (type))));
2088 DECL_EXTERNAL (decl) = 0;
2098 else if (DECL_TEMPLATE_INSTANTIATION (decl)
2099 || DECL_FRIEND_PSEUDO_TEMPLATE_INSTANTIATION (decl))
2101 /* DECL is an implicit instantiation of a function or static
2103 if (flag_implicit_templates
2104 || (flag_implicit_inline_templates
2105 && TREE_CODE (decl) == FUNCTION_DECL
2106 && DECL_DECLARED_INLINE_P (decl)))
2109 /* If we are not implicitly generating templates, then mark
2110 this entity as undefined in this translation unit. */
2113 else if (DECL_FUNCTION_MEMBER_P (decl))
2115 if (!DECL_DECLARED_INLINE_P (decl))
2117 tree ctype = DECL_CONTEXT (decl);
2118 import_export_class (ctype);
2119 if (CLASSTYPE_INTERFACE_KNOWN (ctype))
2121 DECL_NOT_REALLY_EXTERN (decl)
2122 = ! (CLASSTYPE_INTERFACE_ONLY (ctype)
2123 || (DECL_DECLARED_INLINE_P (decl)
2124 && ! flag_implement_inlines
2125 && !DECL_VINDEX (decl)));
2127 if (!DECL_NOT_REALLY_EXTERN (decl))
2128 DECL_EXTERNAL (decl) = 1;
2130 /* Always make artificials weak. */
2131 if (DECL_ARTIFICIAL (decl) && flag_weak)
2134 maybe_make_one_only (decl);
2145 /* If we are importing DECL into this translation unit, mark is
2146 an undefined here. */
2147 DECL_EXTERNAL (decl) = 1;
2148 DECL_NOT_REALLY_EXTERN (decl) = 0;
2152 /* If we decided to put DECL in COMDAT, mark it accordingly at
2154 comdat_linkage (decl);
2157 DECL_INTERFACE_KNOWN (decl) = 1;
2160 /* Return an expression that performs the destruction of DECL, which
2161 must be a VAR_DECL whose type has a non-trivial destructor, or is
2162 an array whose (innermost) elements have a non-trivial destructor. */
2165 build_cleanup (tree decl)
2168 tree type = TREE_TYPE (decl);
2170 /* This function should only be called for declarations that really
2171 require cleanups. */
2172 gcc_assert (!TYPE_HAS_TRIVIAL_DESTRUCTOR (type));
2174 /* Treat all objects with destructors as used; the destructor may do
2175 something substantive. */
2178 if (TREE_CODE (type) == ARRAY_TYPE)
2182 cxx_mark_addressable (decl);
2183 temp = build1 (ADDR_EXPR, build_pointer_type (type), decl);
2185 temp = build_delete (TREE_TYPE (temp), temp,
2186 sfk_complete_destructor,
2187 LOOKUP_NORMAL|LOOKUP_NONVIRTUAL|LOOKUP_DESTRUCTOR, 0);
2191 /* Returns the initialization guard variable for the variable DECL,
2192 which has static storage duration. */
2195 get_guard (tree decl)
2200 sname = mangle_guard_variable (decl);
2201 guard = IDENTIFIER_GLOBAL_VALUE (sname);
2206 /* We use a type that is big enough to contain a mutex as well
2207 as an integer counter. */
2208 guard_type = targetm.cxx.guard_type ();
2209 guard = build_decl (VAR_DECL, sname, guard_type);
2211 /* The guard should have the same linkage as what it guards. */
2212 TREE_PUBLIC (guard) = TREE_PUBLIC (decl);
2213 TREE_STATIC (guard) = TREE_STATIC (decl);
2214 DECL_COMMON (guard) = DECL_COMMON (decl);
2215 DECL_ONE_ONLY (guard) = DECL_ONE_ONLY (decl);
2216 if (TREE_PUBLIC (decl))
2217 DECL_WEAK (guard) = DECL_WEAK (decl);
2219 DECL_ARTIFICIAL (guard) = 1;
2220 DECL_IGNORED_P (guard) = 1;
2221 TREE_USED (guard) = 1;
2222 pushdecl_top_level_and_finish (guard, NULL_TREE);
2227 /* Return those bits of the GUARD variable that should be set when the
2228 guarded entity is actually initialized. */
2231 get_guard_bits (tree guard)
2233 if (!targetm.cxx.guard_mask_bit ())
2235 /* We only set the first byte of the guard, in order to leave room
2236 for a mutex in the high-order bits. */
2237 guard = build1 (ADDR_EXPR,
2238 build_pointer_type (TREE_TYPE (guard)),
2240 guard = build1 (NOP_EXPR,
2241 build_pointer_type (char_type_node),
2243 guard = build1 (INDIRECT_REF, char_type_node, guard);
2249 /* Return an expression which determines whether or not the GUARD
2250 variable has already been initialized. */
2253 get_guard_cond (tree guard)
2257 /* Check to see if the GUARD is zero. */
2258 guard = get_guard_bits (guard);
2260 /* Mask off all but the low bit. */
2261 if (targetm.cxx.guard_mask_bit ())
2263 guard_value = integer_one_node;
2264 if (!same_type_p (TREE_TYPE (guard_value), TREE_TYPE (guard)))
2265 guard_value = convert (TREE_TYPE (guard), guard_value);
2266 guard = cp_build_binary_op (BIT_AND_EXPR, guard, guard_value);
2269 guard_value = integer_zero_node;
2270 if (!same_type_p (TREE_TYPE (guard_value), TREE_TYPE (guard)))
2271 guard_value = convert (TREE_TYPE (guard), guard_value);
2272 return cp_build_binary_op (EQ_EXPR, guard, guard_value);
2275 /* Return an expression which sets the GUARD variable, indicating that
2276 the variable being guarded has been initialized. */
2279 set_guard (tree guard)
2283 /* Set the GUARD to one. */
2284 guard = get_guard_bits (guard);
2285 guard_init = integer_one_node;
2286 if (!same_type_p (TREE_TYPE (guard_init), TREE_TYPE (guard)))
2287 guard_init = convert (TREE_TYPE (guard), guard_init);
2288 return build_modify_expr (guard, NOP_EXPR, guard_init);
2291 /* Start the process of running a particular set of global constructors
2292 or destructors. Subroutine of do_[cd]tors. */
2295 start_objects (int method_type, int initp)
2301 /* Make ctor or dtor function. METHOD_TYPE may be 'I' or 'D'. */
2303 if (initp != DEFAULT_INIT_PRIORITY)
2313 sprintf (type, "%c%c%.5u", method_type, joiner, initp);
2316 sprintf (type, "%c", method_type);
2318 fndecl = build_lang_decl (FUNCTION_DECL,
2319 get_file_function_name_long (type),
2320 build_function_type (void_type_node,
2322 start_preparsed_function (fndecl, /*attrs=*/NULL_TREE, SF_PRE_PARSED);
2324 /* It can be a static function as long as collect2 does not have
2325 to scan the object file to find its ctor/dtor routine. */
2326 TREE_PUBLIC (current_function_decl) = ! targetm.have_ctors_dtors;
2328 /* Mark this declaration as used to avoid spurious warnings. */
2329 TREE_USED (current_function_decl) = 1;
2331 /* Mark this function as a global constructor or destructor. */
2332 if (method_type == 'I')
2333 DECL_GLOBAL_CTOR_P (current_function_decl) = 1;
2335 DECL_GLOBAL_DTOR_P (current_function_decl) = 1;
2336 DECL_LANG_SPECIFIC (current_function_decl)->decl_flags.u2sel = 1;
2338 body = begin_compound_stmt (BCS_FN_BODY);
2340 /* We cannot allow these functions to be elided, even if they do not
2341 have external linkage. And, there's no point in deferring
2342 compilation of these functions; they're all going to have to be
2344 DECL_INLINE (current_function_decl) = 0;
2345 DECL_UNINLINABLE (current_function_decl) = 1;
2350 /* Finish the process of running a particular set of global constructors
2351 or destructors. Subroutine of do_[cd]tors. */
2354 finish_objects (int method_type, int initp, tree body)
2359 finish_compound_stmt (body);
2360 fn = finish_function (0);
2361 expand_or_defer_fn (fn);
2363 /* When only doing semantic analysis, and no RTL generation, we
2364 can't call functions that directly emit assembly code; there is
2365 no assembly file in which to put the code. */
2366 if (flag_syntax_only)
2369 if (targetm.have_ctors_dtors)
2371 rtx fnsym = XEXP (DECL_RTL (fn), 0);
2372 cgraph_mark_needed_node (cgraph_node (fn));
2373 if (method_type == 'I')
2374 (* targetm.asm_out.constructor) (fnsym, initp);
2376 (* targetm.asm_out.destructor) (fnsym, initp);
2380 /* The names of the parameters to the function created to handle
2381 initializations and destructions for objects with static storage
2383 #define INITIALIZE_P_IDENTIFIER "__initialize_p"
2384 #define PRIORITY_IDENTIFIER "__priority"
2386 /* The name of the function we create to handle initializations and
2387 destructions for objects with static storage duration. */
2388 #define SSDF_IDENTIFIER "__static_initialization_and_destruction"
2390 /* The declaration for the __INITIALIZE_P argument. */
2391 static GTY(()) tree initialize_p_decl;
2393 /* The declaration for the __PRIORITY argument. */
2394 static GTY(()) tree priority_decl;
2396 /* The declaration for the static storage duration function. */
2397 static GTY(()) tree ssdf_decl;
2399 /* All the static storage duration functions created in this
2400 translation unit. */
2401 static GTY(()) VEC(tree,gc) *ssdf_decls;
2403 /* A map from priority levels to information about that priority
2404 level. There may be many such levels, so efficient lookup is
2406 static splay_tree priority_info_map;
2408 /* Begins the generation of the function that will handle all
2409 initialization and destruction of objects with static storage
2410 duration. The function generated takes two parameters of type
2411 `int': __INITIALIZE_P and __PRIORITY. If __INITIALIZE_P is
2412 nonzero, it performs initializations. Otherwise, it performs
2413 destructions. It only performs those initializations or
2414 destructions with the indicated __PRIORITY. The generated function
2417 It is assumed that this function will only be called once per
2418 translation unit. */
2421 start_static_storage_duration_function (unsigned count)
2426 char id[sizeof (SSDF_IDENTIFIER) + 1 /* '\0' */ + 32];
2428 /* Create the identifier for this function. It will be of the form
2429 SSDF_IDENTIFIER_<number>. */
2430 sprintf (id, "%s_%u", SSDF_IDENTIFIER, count);
2432 /* Create the parameters. */
2433 parm_types = void_list_node;
2434 parm_types = tree_cons (NULL_TREE, integer_type_node, parm_types);
2435 parm_types = tree_cons (NULL_TREE, integer_type_node, parm_types);
2436 type = build_function_type (void_type_node, parm_types);
2438 /* Create the FUNCTION_DECL itself. */
2439 ssdf_decl = build_lang_decl (FUNCTION_DECL,
2440 get_identifier (id),
2442 TREE_PUBLIC (ssdf_decl) = 0;
2443 DECL_ARTIFICIAL (ssdf_decl) = 1;
2445 /* Put this function in the list of functions to be called from the
2446 static constructors and destructors. */
2449 ssdf_decls = VEC_alloc (tree, gc, 32);
2451 /* Take this opportunity to initialize the map from priority
2452 numbers to information about that priority level. */
2453 priority_info_map = splay_tree_new (splay_tree_compare_ints,
2454 /*delete_key_fn=*/0,
2455 /*delete_value_fn=*/
2456 (splay_tree_delete_value_fn) &free);
2458 /* We always need to generate functions for the
2459 DEFAULT_INIT_PRIORITY so enter it now. That way when we walk
2460 priorities later, we'll be sure to find the
2461 DEFAULT_INIT_PRIORITY. */
2462 get_priority_info (DEFAULT_INIT_PRIORITY);
2465 VEC_safe_push (tree, gc, ssdf_decls, ssdf_decl);
2467 /* Create the argument list. */
2468 initialize_p_decl = cp_build_parm_decl
2469 (get_identifier (INITIALIZE_P_IDENTIFIER), integer_type_node);
2470 DECL_CONTEXT (initialize_p_decl) = ssdf_decl;
2471 TREE_USED (initialize_p_decl) = 1;
2472 priority_decl = cp_build_parm_decl
2473 (get_identifier (PRIORITY_IDENTIFIER), integer_type_node);
2474 DECL_CONTEXT (priority_decl) = ssdf_decl;
2475 TREE_USED (priority_decl) = 1;
2477 TREE_CHAIN (initialize_p_decl) = priority_decl;
2478 DECL_ARGUMENTS (ssdf_decl) = initialize_p_decl;
2480 /* Put the function in the global scope. */
2481 pushdecl (ssdf_decl);
2483 /* Start the function itself. This is equivalent to declaring the
2486 static void __ssdf (int __initialize_p, init __priority_p);
2488 It is static because we only need to call this function from the
2489 various constructor and destructor functions for this module. */
2490 start_preparsed_function (ssdf_decl,
2491 /*attrs=*/NULL_TREE,
2494 /* Set up the scope of the outermost block in the function. */
2495 body = begin_compound_stmt (BCS_FN_BODY);
2497 /* This function must not be deferred because we are depending on
2498 its compilation to tell us what is TREE_SYMBOL_REFERENCED. */
2499 DECL_INLINE (ssdf_decl) = 0;
2500 DECL_UNINLINABLE (ssdf_decl) = 1;
2505 /* Finish the generation of the function which performs initialization
2506 and destruction of objects with static storage duration. After
2507 this point, no more such objects can be created. */
2510 finish_static_storage_duration_function (tree body)
2512 /* Close out the function. */
2513 finish_compound_stmt (body);
2514 expand_or_defer_fn (finish_function (0));
2517 /* Return the information about the indicated PRIORITY level. If no
2518 code to handle this level has yet been generated, generate the
2519 appropriate prologue. */
2521 static priority_info
2522 get_priority_info (int priority)
2527 n = splay_tree_lookup (priority_info_map,
2528 (splay_tree_key) priority);
2531 /* Create a new priority information structure, and insert it
2533 pi = XNEW (struct priority_info_s);
2534 pi->initializations_p = 0;
2535 pi->destructions_p = 0;
2536 splay_tree_insert (priority_info_map,
2537 (splay_tree_key) priority,
2538 (splay_tree_value) pi);
2541 pi = (priority_info) n->value;
2546 /* The effective initialization priority of a DECL. */
2548 #define DECL_EFFECTIVE_INIT_PRIORITY(decl) \
2549 ((!DECL_HAS_INIT_PRIORITY_P (decl) || DECL_INIT_PRIORITY (decl) == 0) \
2550 ? DEFAULT_INIT_PRIORITY : DECL_INIT_PRIORITY (decl))
2552 /* Whether a DECL needs a guard to protect it against multiple
2555 #define NEEDS_GUARD_P(decl) (TREE_PUBLIC (decl) && (DECL_COMMON (decl) \
2556 || DECL_ONE_ONLY (decl) \
2557 || DECL_WEAK (decl)))
2559 /* Set up to handle the initialization or destruction of DECL. If
2560 INITP is nonzero, we are initializing the variable. Otherwise, we
2561 are destroying it. */
2564 one_static_initialization_or_destruction (tree decl, tree init, bool initp)
2566 tree guard_if_stmt = NULL_TREE;
2569 /* If we are supposed to destruct and there's a trivial destructor,
2570 nothing has to be done. */
2572 && TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
2575 /* Trick the compiler into thinking we are at the file and line
2576 where DECL was declared so that error-messages make sense, and so
2577 that the debugger will show somewhat sensible file and line
2579 input_location = DECL_SOURCE_LOCATION (decl);
2585 Access control for implicit calls to the constructors,
2586 the conversion functions, or the destructor called to
2587 create and destroy a static data member is performed as
2588 if these calls appeared in the scope of the member's
2591 we pretend we are in a static member function of the class of
2592 which the DECL is a member. */
2593 if (member_p (decl))
2595 DECL_CONTEXT (current_function_decl) = DECL_CONTEXT (decl);
2596 DECL_STATIC_FUNCTION_P (current_function_decl) = 1;
2599 /* Assume we don't need a guard. */
2601 /* We need a guard if this is an object with external linkage that
2602 might be initialized in more than one place. (For example, a
2603 static data member of a template, when the data member requires
2605 if (NEEDS_GUARD_P (decl))
2609 guard = get_guard (decl);
2611 /* When using __cxa_atexit, we just check the GUARD as we would
2612 for a local static. */
2613 if (flag_use_cxa_atexit)
2615 /* When using __cxa_atexit, we never try to destroy
2616 anything from a static destructor. */
2618 guard_cond = get_guard_cond (guard);
2620 /* If we don't have __cxa_atexit, then we will be running
2621 destructors from .fini sections, or their equivalents. So,
2622 we need to know how many times we've tried to initialize this
2623 object. We do initializations only if the GUARD is zero,
2624 i.e., if we are the first to initialize the variable. We do
2625 destructions only if the GUARD is one, i.e., if we are the
2626 last to destroy the variable. */
2629 = cp_build_binary_op (EQ_EXPR,
2630 build_unary_op (PREINCREMENT_EXPR,
2636 = cp_build_binary_op (EQ_EXPR,
2637 build_unary_op (PREDECREMENT_EXPR,
2642 guard_if_stmt = begin_if_stmt ();
2643 finish_if_stmt_cond (guard_cond, guard_if_stmt);
2647 /* If we're using __cxa_atexit, we have not already set the GUARD,
2648 so we must do so now. */
2649 if (guard && initp && flag_use_cxa_atexit)
2650 finish_expr_stmt (set_guard (guard));
2652 /* Perform the initialization or destruction. */
2656 finish_expr_stmt (init);
2658 /* If we're using __cxa_atexit, register a function that calls the
2659 destructor for the object. */
2660 if (flag_use_cxa_atexit)
2661 finish_expr_stmt (register_dtor_fn (decl));
2664 finish_expr_stmt (build_cleanup (decl));
2666 /* Finish the guard if-stmt, if necessary. */
2669 finish_then_clause (guard_if_stmt);
2670 finish_if_stmt (guard_if_stmt);
2673 /* Now that we're done with DECL we don't need to pretend to be a
2674 member of its class any longer. */
2675 DECL_CONTEXT (current_function_decl) = NULL_TREE;
2676 DECL_STATIC_FUNCTION_P (current_function_decl) = 0;
2679 /* Generate code to do the initialization or destruction of the decls in VARS,
2680 a TREE_LIST of VAR_DECL with static storage duration.
2681 Whether initialization or destruction is performed is specified by INITP. */
2684 do_static_initialization_or_destruction (tree vars, bool initp)
2686 tree node, init_if_stmt, cond;
2688 /* Build the outer if-stmt to check for initialization or destruction. */
2689 init_if_stmt = begin_if_stmt ();
2690 cond = initp ? integer_one_node : integer_zero_node;
2691 cond = cp_build_binary_op (EQ_EXPR,
2694 finish_if_stmt_cond (cond, init_if_stmt);
2698 tree decl = TREE_VALUE (node);
2699 tree priority_if_stmt;
2703 /* If we don't need a destructor, there's nothing to do. Avoid
2704 creating a possibly empty if-stmt. */
2705 if (!initp && TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
2707 node = TREE_CHAIN (node);
2711 /* Remember that we had an initialization or finalization at this
2713 priority = DECL_EFFECTIVE_INIT_PRIORITY (decl);
2714 pi = get_priority_info (priority);
2716 pi->initializations_p = 1;
2718 pi->destructions_p = 1;
2720 /* Conditionalize this initialization on being in the right priority
2721 and being initializing/finalizing appropriately. */
2722 priority_if_stmt = begin_if_stmt ();
2723 cond = cp_build_binary_op (EQ_EXPR,
2725 build_int_cst (NULL_TREE, priority));
2726 finish_if_stmt_cond (cond, priority_if_stmt);
2728 /* Process initializers with same priority. */
2730 && DECL_EFFECTIVE_INIT_PRIORITY (TREE_VALUE (node)) == priority;
2731 node = TREE_CHAIN (node))
2732 /* Do one initialization or destruction. */
2733 one_static_initialization_or_destruction (TREE_VALUE (node),
2734 TREE_PURPOSE (node), initp);
2736 /* Finish up the priority if-stmt body. */
2737 finish_then_clause (priority_if_stmt);
2738 finish_if_stmt (priority_if_stmt);
2742 /* Finish up the init/destruct if-stmt body. */
2743 finish_then_clause (init_if_stmt);
2744 finish_if_stmt (init_if_stmt);
2747 /* VARS is a list of variables with static storage duration which may
2748 need initialization and/or finalization. Remove those variables
2749 that don't really need to be initialized or finalized, and return
2750 the resulting list. The order in which the variables appear in
2751 VARS is in reverse order of the order in which they should actually
2752 be initialized. The list we return is in the unreversed order;
2753 i.e., the first variable should be initialized first. */
2756 prune_vars_needing_no_initialization (tree *vars)
2759 tree result = NULL_TREE;
2764 tree decl = TREE_VALUE (t);
2765 tree init = TREE_PURPOSE (t);
2767 /* Deal gracefully with error. */
2768 if (decl == error_mark_node)
2770 var = &TREE_CHAIN (t);
2774 /* The only things that can be initialized are variables. */
2775 gcc_assert (TREE_CODE (decl) == VAR_DECL);
2777 /* If this object is not defined, we don't need to do anything
2779 if (DECL_EXTERNAL (decl))
2781 var = &TREE_CHAIN (t);
2785 /* Also, if the initializer already contains errors, we can bail
2787 if (init && TREE_CODE (init) == TREE_LIST
2788 && value_member (error_mark_node, init))
2790 var = &TREE_CHAIN (t);
2794 /* This variable is going to need initialization and/or
2795 finalization, so we add it to the list. */
2796 *var = TREE_CHAIN (t);
2797 TREE_CHAIN (t) = result;
2804 /* Make sure we have told the back end about all the variables in
2808 write_out_vars (tree vars)
2812 for (v = vars; v; v = TREE_CHAIN (v))
2814 tree var = TREE_VALUE (v);
2815 if (!var_finalized_p (var))
2817 import_export_decl (var);
2818 rest_of_decl_compilation (var, 1, 1);
2823 /* Generate a static constructor (if CONSTRUCTOR_P) or destructor
2824 (otherwise) that will initialize all gobal objects with static
2825 storage duration having the indicated PRIORITY. */
2828 generate_ctor_or_dtor_function (bool constructor_p, int priority,
2837 input_location = *locus;
2838 #ifdef USE_MAPPED_LOCATION
2844 /* We use `I' to indicate initialization and `D' to indicate
2846 function_key = constructor_p ? 'I' : 'D';
2848 /* We emit the function lazily, to avoid generating empty
2849 global constructors and destructors. */
2852 /* For Objective-C++, we may need to initialize metadata found in this module.
2853 This must be done _before_ any other static initializations. */
2854 if (c_dialect_objc () && (priority == DEFAULT_INIT_PRIORITY)
2855 && constructor_p && objc_static_init_needed_p ())
2857 body = start_objects (function_key, priority);
2858 static_ctors = objc_generate_static_init_call (static_ctors);
2861 /* Call the static storage duration function with appropriate
2863 for (i = 0; VEC_iterate (tree, ssdf_decls, i, fndecl); ++i)
2865 /* Calls to pure or const functions will expand to nothing. */
2866 if (! (flags_from_decl_or_type (fndecl) & (ECF_CONST | ECF_PURE)))
2869 body = start_objects (function_key, priority);
2871 arguments = tree_cons (NULL_TREE,
2872 build_int_cst (NULL_TREE, priority),
2874 arguments = tree_cons (NULL_TREE,
2875 build_int_cst (NULL_TREE, constructor_p),
2877 finish_expr_stmt (build_function_call (fndecl, arguments));
2881 /* If we're generating code for the DEFAULT_INIT_PRIORITY, throw in
2882 calls to any functions marked with attributes indicating that
2883 they should be called at initialization- or destruction-time. */
2884 if (priority == DEFAULT_INIT_PRIORITY)
2888 for (fns = constructor_p ? static_ctors : static_dtors;
2890 fns = TREE_CHAIN (fns))
2892 fndecl = TREE_VALUE (fns);
2894 /* Calls to pure/const functions will expand to nothing. */
2895 if (! (flags_from_decl_or_type (fndecl) & (ECF_CONST | ECF_PURE)))
2898 body = start_objects (function_key, priority);
2899 finish_expr_stmt (build_function_call (fndecl, NULL_TREE));
2904 /* Close out the function. */
2906 finish_objects (function_key, priority, body);
2909 /* Generate constructor and destructor functions for the priority
2913 generate_ctor_and_dtor_functions_for_priority (splay_tree_node n, void * data)
2915 location_t *locus = (location_t *) data;
2916 int priority = (int) n->key;
2917 priority_info pi = (priority_info) n->value;
2919 /* Generate the functions themselves, but only if they are really
2921 if (pi->initializations_p
2922 || (priority == DEFAULT_INIT_PRIORITY && static_ctors))
2923 generate_ctor_or_dtor_function (/*constructor_p=*/true, priority, locus);
2924 if (pi->destructions_p
2925 || (priority == DEFAULT_INIT_PRIORITY && static_dtors))
2926 generate_ctor_or_dtor_function (/*constructor_p=*/false, priority, locus);
2928 /* Keep iterating. */
2932 /* Called via LANGHOOK_CALLGRAPH_ANALYZE_EXPR. It is supposed to mark
2933 decls referenced from frontend specific constructs; it will be called
2934 only for language-specific tree nodes.
2936 Here we must deal with member pointers. */
2939 cxx_callgraph_analyze_expr (tree *tp, int *walk_subtrees ATTRIBUTE_UNUSED,
2940 tree from ATTRIBUTE_UNUSED)
2944 switch (TREE_CODE (t))
2947 if (TYPE_PTRMEMFUNC_P (TREE_TYPE (t)))
2948 cgraph_mark_needed_node (cgraph_node (PTRMEM_CST_MEMBER (t)));
2951 if (TREE_CODE (BASELINK_FUNCTIONS (t)) == FUNCTION_DECL)
2952 cgraph_mark_needed_node (cgraph_node (BASELINK_FUNCTIONS (t)));
2955 if (DECL_VTABLE_OR_VTT_P (t))
2957 /* The ABI requires that all virtual tables be emitted
2958 whenever one of them is. */
2960 for (vtbl = CLASSTYPE_VTABLES (DECL_CONTEXT (t));
2962 vtbl = TREE_CHAIN (vtbl))
2963 mark_decl_referenced (vtbl);
2965 else if (DECL_CONTEXT (t)
2966 && TREE_CODE (DECL_CONTEXT (t)) == FUNCTION_DECL)
2967 /* If we need a static variable in a function, then we
2968 need the containing function. */
2969 mark_decl_referenced (DECL_CONTEXT (t));
2978 /* Java requires that we be able to reference a local address for a
2979 method, and not be confused by PLT entries. If hidden aliases are
2980 supported, emit one for each java function that we've emitted. */
2983 build_java_method_aliases (void)
2985 struct cgraph_node *node;
2987 #ifndef HAVE_GAS_HIDDEN
2991 for (node = cgraph_nodes; node ; node = node->next)
2993 tree fndecl = node->decl;
2995 if (TREE_ASM_WRITTEN (fndecl)
2996 && DECL_CONTEXT (fndecl)
2997 && TYPE_P (DECL_CONTEXT (fndecl))
2998 && TYPE_FOR_JAVA (DECL_CONTEXT (fndecl))
2999 && TARGET_USE_LOCAL_THUNK_ALIAS_P (fndecl))
3001 /* Mangle the name in a predictable way; we need to reference
3002 this from a java compiled object file. */
3003 tree oid, nid, alias;
3007 oid = DECL_ASSEMBLER_NAME (fndecl);
3008 oname = IDENTIFIER_POINTER (oid);
3009 gcc_assert (oname[0] == '_' && oname[1] == 'Z');
3010 nname = ACONCAT (("_ZGA", oname+2, NULL));
3011 nid = get_identifier (nname);
3013 alias = make_alias_for (fndecl, nid);
3014 TREE_PUBLIC (alias) = 1;
3015 DECL_VISIBILITY (alias) = VISIBILITY_HIDDEN;
3017 assemble_alias (alias, oid);
3022 /* This routine is called from the last rule in yyparse ().
3023 Its job is to create all the code needed to initialize and
3024 destroy the global aggregates. We do the destruction
3025 first, since that way we only need to reverse the decls once. */
3028 cp_finish_file (void)
3034 unsigned ssdf_count = 0;
3038 locus = input_location;
3041 /* Bad parse errors. Just forget about it. */
3042 if (! global_bindings_p () || current_class_type || decl_namespace_list)
3046 c_common_write_pch ();
3048 #ifdef USE_MAPPED_LOCATION
3051 /* Otherwise, GDB can get confused, because in only knows
3052 about source for LINENO-1 lines. */
3056 /* We now have to write out all the stuff we put off writing out.
3059 o Template specializations that we have not yet instantiated,
3060 but which are needed.
3061 o Initialization and destruction for non-local objects with
3062 static storage duration. (Local objects with static storage
3063 duration are initialized when their scope is first entered,
3064 and are cleaned up via atexit.)
3065 o Virtual function tables.
3067 All of these may cause others to be needed. For example,
3068 instantiating one function may cause another to be needed, and
3069 generating the initializer for an object may cause templates to be
3070 instantiated, etc., etc. */
3072 timevar_push (TV_VARCONST);
3074 emit_support_tinfos ();
3083 /* If there are templates that we've put off instantiating, do
3085 instantiate_pending_templates (retries);
3088 /* Write out virtual tables as required. Note that writing out
3089 the virtual table for a template class may cause the
3090 instantiation of members of that class. If we write out
3091 vtables then we remove the class from our list so we don't
3092 have to look at it again. */
3094 while (keyed_classes != NULL_TREE
3095 && maybe_emit_vtables (TREE_VALUE (keyed_classes)))
3098 keyed_classes = TREE_CHAIN (keyed_classes);
3104 tree next = TREE_CHAIN (t);
3108 if (maybe_emit_vtables (TREE_VALUE (next)))
3111 TREE_CHAIN (t) = TREE_CHAIN (next);
3116 next = TREE_CHAIN (t);
3120 /* Write out needed type info variables. We have to be careful
3121 looping through unemitted decls, because emit_tinfo_decl may
3122 cause other variables to be needed. New elements will be
3123 appended, and we remove from the vector those that actually
3125 for (i = VEC_length (tree, unemitted_tinfo_decls);
3126 VEC_iterate (tree, unemitted_tinfo_decls, --i, t);)
3127 if (emit_tinfo_decl (t))
3130 VEC_unordered_remove (tree, unemitted_tinfo_decls, i);
3133 /* The list of objects with static storage duration is built up
3134 in reverse order. We clear STATIC_AGGREGATES so that any new
3135 aggregates added during the initialization of these will be
3136 initialized in the correct order when we next come around the
3138 vars = prune_vars_needing_no_initialization (&static_aggregates);
3142 /* We need to start a new initialization function each time
3143 through the loop. That's because we need to know which
3144 vtables have been referenced, and TREE_SYMBOL_REFERENCED
3145 isn't computed until a function is finished, and written
3146 out. That's a deficiency in the back-end. When this is
3147 fixed, these initialization functions could all become
3148 inline, with resulting performance improvements. */
3151 /* Set the line and file, so that it is obviously not from
3153 input_location = locus;
3154 ssdf_body = start_static_storage_duration_function (ssdf_count);
3156 /* Make sure the back end knows about all the variables. */
3157 write_out_vars (vars);
3159 /* First generate code to do all the initializations. */
3161 do_static_initialization_or_destruction (vars, /*initp=*/true);
3163 /* Then, generate code to do all the destructions. Do these
3164 in reverse order so that the most recently constructed
3165 variable is the first destroyed. If we're using
3166 __cxa_atexit, then we don't need to do this; functions
3167 were registered at initialization time to destroy the
3169 if (!flag_use_cxa_atexit && vars)
3171 vars = nreverse (vars);
3172 do_static_initialization_or_destruction (vars, /*initp=*/false);
3177 /* Finish up the static storage duration function for this
3179 input_location = locus;
3180 finish_static_storage_duration_function (ssdf_body);
3182 /* All those initializations and finalizations might cause
3183 us to need more inline functions, more template
3184 instantiations, etc. */
3187 #ifdef USE_MAPPED_LOCATION
3194 /* Go through the set of inline functions whose bodies have not
3195 been emitted yet. If out-of-line copies of these functions
3196 are required, emit them. */
3197 for (i = 0; VEC_iterate (tree, deferred_fns, i, decl); ++i)
3199 /* Does it need synthesizing? */
3200 if (DECL_ARTIFICIAL (decl) && ! DECL_INITIAL (decl)
3201 && (! DECL_REALLY_EXTERN (decl) || DECL_INLINE (decl)))
3203 /* Even though we're already at the top-level, we push
3204 there again. That way, when we pop back a few lines
3205 hence, all of our state is restored. Otherwise,
3206 finish_function doesn't clean things up, and we end
3207 up with CURRENT_FUNCTION_DECL set. */
3208 push_to_top_level ();
3209 /* The decl's location will mark where it was first
3210 needed. Save that so synthesize method can indicate
3211 where it was needed from, in case of error */
3212 input_location = DECL_SOURCE_LOCATION (decl);
3213 synthesize_method (decl);
3214 pop_from_top_level ();
3218 if (!DECL_SAVED_TREE (decl))
3221 /* We lie to the back-end, pretending that some functions
3222 are not defined when they really are. This keeps these
3223 functions from being put out unnecessarily. But, we must
3224 stop lying when the functions are referenced, or if they
3225 are not comdat since they need to be put out now. If
3226 DECL_INTERFACE_KNOWN, then we have already set
3227 DECL_EXTERNAL appropriately, so there's no need to check
3228 again, and we do not want to clear DECL_EXTERNAL if a
3229 previous call to import_export_decl set it.
3231 This is done in a separate for cycle, because if some
3232 deferred function is contained in another deferred
3233 function later in deferred_fns varray,
3234 rest_of_compilation would skip this function and we
3235 really cannot expand the same function twice. */
3236 import_export_decl (decl);
3237 if (DECL_NOT_REALLY_EXTERN (decl)
3238 && DECL_INITIAL (decl)
3239 && decl_needed_p (decl))
3240 DECL_EXTERNAL (decl) = 0;
3242 /* If we're going to need to write this function out, and
3243 there's already a body for it, create RTL for it now.
3244 (There might be no body if this is a method we haven't
3245 gotten around to synthesizing yet.) */
3246 if (!DECL_EXTERNAL (decl)
3247 && decl_needed_p (decl)
3248 && !TREE_ASM_WRITTEN (decl)
3249 && !cgraph_node (decl)->local.finalized)
3251 /* We will output the function; no longer consider it in this
3253 DECL_DEFER_OUTPUT (decl) = 0;
3254 /* Generate RTL for this function now that we know we
3256 expand_or_defer_fn (decl);
3257 /* If we're compiling -fsyntax-only pretend that this
3258 function has been written out so that we don't try to
3260 if (flag_syntax_only)
3261 TREE_ASM_WRITTEN (decl) = 1;
3266 if (walk_namespaces (wrapup_globals_for_namespace, /*data=*/0))
3269 /* Static data members are just like namespace-scope globals. */
3270 for (i = 0; VEC_iterate (tree, pending_statics, i, decl); ++i)
3272 if (var_finalized_p (decl) || DECL_REALLY_EXTERN (decl))
3274 import_export_decl (decl);
3275 /* If this static data member is needed, provide it to the
3277 if (DECL_NOT_REALLY_EXTERN (decl) && decl_needed_p (decl))
3278 DECL_EXTERNAL (decl) = 0;
3280 if (VEC_length (tree, pending_statics) != 0
3281 && wrapup_global_declarations (VEC_address (tree, pending_statics),
3282 VEC_length (tree, pending_statics)))
3289 /* All used inline functions must have a definition at this point. */
3290 for (i = 0; VEC_iterate (tree, deferred_fns, i, decl); ++i)
3292 if (/* Check online inline functions that were actually used. */
3293 TREE_USED (decl) && DECL_DECLARED_INLINE_P (decl)
3294 /* If the definition actually was available here, then the
3295 fact that the function was not defined merely represents
3296 that for some reason (use of a template repository,
3297 #pragma interface, etc.) we decided not to emit the
3299 && !DECL_INITIAL (decl)
3300 /* An explicit instantiation can be used to specify
3301 that the body is in another unit. It will have
3302 already verified there was a definition. */
3303 && !DECL_EXPLICIT_INSTANTIATION (decl))
3305 warning (0, "inline function %q+D used but never defined", decl);
3306 /* Avoid a duplicate warning from check_global_declaration_1. */
3307 TREE_NO_WARNING (decl) = 1;
3311 /* We give C linkage to static constructors and destructors. */
3312 push_lang_context (lang_name_c);
3314 /* Generate initialization and destruction functions for all
3315 priorities for which they are required. */
3316 if (priority_info_map)
3317 splay_tree_foreach (priority_info_map,
3318 generate_ctor_and_dtor_functions_for_priority,
3322 /* If we have a ctor or this is obj-c++ and we need a static init,
3323 call generate_ctor_or_dtor_function. */
3324 if (static_ctors || (c_dialect_objc () && objc_static_init_needed_p ()))
3325 generate_ctor_or_dtor_function (/*constructor_p=*/true,
3326 DEFAULT_INIT_PRIORITY, &locus);
3328 generate_ctor_or_dtor_function (/*constructor_p=*/false,
3329 DEFAULT_INIT_PRIORITY, &locus);
3332 /* We're done with the splay-tree now. */
3333 if (priority_info_map)
3334 splay_tree_delete (priority_info_map);
3336 /* Generate any missing aliases. */
3337 maybe_apply_pending_pragma_weaks ();
3339 /* We're done with static constructors, so we can go back to "C++"
3341 pop_lang_context ();
3343 cgraph_finalize_compilation_unit ();
3346 /* Now, issue warnings about static, but not defined, functions,
3347 etc., and emit debugging information. */
3348 walk_namespaces (wrapup_globals_for_namespace, /*data=*/&reconsider);
3349 if (VEC_length (tree, pending_statics) != 0)
3351 check_global_declarations (VEC_address (tree, pending_statics),
3352 VEC_length (tree, pending_statics));
3353 emit_debug_global_declarations (VEC_address (tree, pending_statics),
3354 VEC_length (tree, pending_statics));
3357 /* Generate hidden aliases for Java. */
3358 build_java_method_aliases ();
3362 /* The entire file is now complete. If requested, dump everything
3366 FILE *stream = dump_begin (TDI_tu, &flags);
3370 dump_node (global_namespace, flags & ~TDF_SLIM, stream);
3371 dump_end (TDI_tu, stream);
3375 timevar_pop (TV_VARCONST);
3377 if (flag_detailed_statistics)
3379 dump_tree_statistics ();
3380 dump_time_statistics ();
3382 input_location = locus;
3384 #ifdef ENABLE_CHECKING
3385 validate_conversion_obstack ();
3386 #endif /* ENABLE_CHECKING */
3389 /* FN is an OFFSET_REF, DOTSTAR_EXPR or MEMBER_REF indicating the
3390 function to call in parse-tree form; it has not yet been
3391 semantically analyzed. ARGS are the arguments to the function.
3392 They have already been semantically analyzed. */
3395 build_offset_ref_call_from_tree (tree fn, tree args)
3404 object = TREE_OPERAND (fn, 0);
3406 if (processing_template_decl)
3408 gcc_assert (TREE_CODE (fn) == DOTSTAR_EXPR
3409 || TREE_CODE (fn) == MEMBER_REF);
3410 if (type_dependent_expression_p (fn)
3411 || any_type_dependent_arguments_p (args))
3412 return build_min_nt (CALL_EXPR, fn, args, NULL_TREE);
3414 /* Transform the arguments and add the implicit "this"
3415 parameter. That must be done before the FN is transformed
3416 because we depend on the form of FN. */
3417 args = build_non_dependent_args (args);
3418 if (TREE_CODE (fn) == DOTSTAR_EXPR)
3419 object = build_unary_op (ADDR_EXPR, object, 0);
3420 object = build_non_dependent_expr (object);
3421 args = tree_cons (NULL_TREE, object, args);
3422 /* Now that the arguments are done, transform FN. */
3423 fn = build_non_dependent_expr (fn);
3426 /* A qualified name corresponding to a bound pointer-to-member is
3427 represented as an OFFSET_REF:
3429 struct B { void g(); };
3431 void B::g() { (this->*p)(); } */
3432 if (TREE_CODE (fn) == OFFSET_REF)
3434 tree object_addr = build_unary_op (ADDR_EXPR, object, 0);
3435 fn = TREE_OPERAND (fn, 1);
3436 fn = get_member_function_from_ptrfunc (&object_addr, fn);
3437 args = tree_cons (NULL_TREE, object_addr, args);
3440 expr = build_function_call (fn, args);
3441 if (processing_template_decl && expr != error_mark_node)
3442 return build_min_non_dep (CALL_EXPR, expr, orig_fn, orig_args, NULL_TREE);
3448 check_default_args (tree x)
3450 tree arg = TYPE_ARG_TYPES (TREE_TYPE (x));
3451 bool saw_def = false;
3452 int i = 0 - (TREE_CODE (TREE_TYPE (x)) == METHOD_TYPE);
3453 for (; arg && arg != void_list_node; arg = TREE_CHAIN (arg), ++i)
3455 if (TREE_PURPOSE (arg))
3459 error ("default argument missing for parameter %P of %q+#D", i, x);
3460 TREE_PURPOSE (arg) = error_mark_node;
3465 /* Mark DECL (either a _DECL or a BASELINK) as "used" in the program.
3466 If DECL is a specialization or implicitly declared class member,
3467 generate the actual definition. */
3470 mark_used (tree decl)
3472 HOST_WIDE_INT saved_processing_template_decl = 0;
3474 /* If DECL is a BASELINK for a single function, then treat it just
3475 like the DECL for the function. Otherwise, if the BASELINK is
3476 for an overloaded function, we don't know which function was
3477 actually used until after overload resolution. */
3478 if (TREE_CODE (decl) == BASELINK)
3480 decl = BASELINK_FUNCTIONS (decl);
3481 if (really_overloaded_fn (decl))
3483 decl = OVL_CURRENT (decl);
3486 TREE_USED (decl) = 1;
3487 /* If we don't need a value, then we don't need to synthesize DECL. */
3488 if (skip_evaluation)
3490 /* Normally, we can wait until instantiation-time to synthesize
3491 DECL. However, if DECL is a static data member initialized with
3492 a constant, we need the value right now because a reference to
3493 such a data member is not value-dependent. */
3494 if (TREE_CODE (decl) == VAR_DECL
3495 && DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl)
3496 && DECL_CLASS_SCOPE_P (decl))
3498 /* Don't try to instantiate members of dependent types. We
3499 cannot just use dependent_type_p here because this function
3500 may be called from fold_non_dependent_expr, and then we may
3501 see dependent types, even though processing_template_decl
3503 if (CLASSTYPE_TEMPLATE_INFO ((DECL_CONTEXT (decl)))
3504 && uses_template_parms (CLASSTYPE_TI_ARGS (DECL_CONTEXT (decl))))
3506 /* Pretend that we are not in a template, even if we are, so
3507 that the static data member initializer will be processed. */
3508 saved_processing_template_decl = processing_template_decl;
3509 processing_template_decl = 0;
3512 if (processing_template_decl)
3515 if (TREE_CODE (decl) == FUNCTION_DECL && DECL_DECLARED_INLINE_P (decl)
3516 && !TREE_ASM_WRITTEN (decl))
3517 /* Remember it, so we can check it was defined. */
3519 if (DECL_DEFERRED_FN (decl))
3522 /* Remember the current location for a function we will end up
3523 synthesizing. Then we can inform the user where it was
3524 required in the case of error. */
3525 if (DECL_ARTIFICIAL (decl) && DECL_NONSTATIC_MEMBER_FUNCTION_P (decl)
3526 && !DECL_THUNK_P (decl))
3527 DECL_SOURCE_LOCATION (decl) = input_location;
3529 note_vague_linkage_fn (decl);
3532 assemble_external (decl);
3534 /* Is it a synthesized method that needs to be synthesized? */
3535 if (TREE_CODE (decl) == FUNCTION_DECL
3536 && DECL_NONSTATIC_MEMBER_FUNCTION_P (decl)
3537 && DECL_ARTIFICIAL (decl)
3538 && !DECL_THUNK_P (decl)
3539 && ! DECL_INITIAL (decl)
3540 /* Kludge: don't synthesize for default args. Unfortunately this
3541 rules out initializers of namespace-scoped objects too, but
3542 it's sort-of ok if the implicit ctor or dtor decl keeps
3543 pointing to the class location. */
3544 && current_function_decl)
3546 synthesize_method (decl);
3547 /* If we've already synthesized the method we don't need to
3548 do the instantiation test below. */
3550 else if ((DECL_NON_THUNK_FUNCTION_P (decl) || TREE_CODE (decl) == VAR_DECL)
3551 && DECL_LANG_SPECIFIC (decl) && DECL_TEMPLATE_INFO (decl)
3552 && (!DECL_EXPLICIT_INSTANTIATION (decl)
3553 || (TREE_CODE (decl) == FUNCTION_DECL
3554 && DECL_INLINE (DECL_TEMPLATE_RESULT
3555 (template_for_substitution (decl))))
3556 /* We need to instantiate static data members so that there
3557 initializers are available in integral constant
3559 || (TREE_CODE (decl) == VAR_DECL
3560 && DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl))))
3561 /* If this is a function or variable that is an instance of some
3562 template, we now know that we will need to actually do the
3563 instantiation. We check that DECL is not an explicit
3564 instantiation because that is not checked in instantiate_decl.
3566 We put off instantiating functions in order to improve compile
3567 times. Maintaining a stack of active functions is expensive,
3568 and the inliner knows to instantiate any functions it might
3569 need. Therefore, we always try to defer instantiation. */
3570 instantiate_decl (decl, /*defer_ok=*/true,
3571 /*expl_inst_class_mem_p=*/false);
3573 processing_template_decl = saved_processing_template_decl;
3576 #include "gt-cp-decl2.h"