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 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, 59 Temple Place - Suite 330,
21 Boston, MA 02111-1307, 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 extern cpp_reader *parse_in;
54 /* This structure contains information about the initializations
55 and/or destructions required for a particular priority level. */
56 typedef struct priority_info_s {
57 /* Nonzero if there have been any initializations at this priority
58 throughout the translation unit. */
59 int initializations_p;
60 /* Nonzero if there have been any destructions at this priority
61 throughout the translation unit. */
65 static void mark_vtable_entries (tree);
66 static void grok_function_init (tree, tree);
67 static bool maybe_emit_vtables (tree);
68 static tree build_anon_union_vars (tree);
69 static bool acceptable_java_type (tree);
70 static tree start_objects (int, int);
71 static void finish_objects (int, int, tree);
72 static tree start_static_storage_duration_function (unsigned);
73 static void finish_static_storage_duration_function (tree);
74 static priority_info get_priority_info (int);
75 static void do_static_initialization (tree, tree);
76 static void do_static_destruction (tree);
77 static tree start_static_initialization_or_destruction (tree, int);
78 static void finish_static_initialization_or_destruction (tree);
79 static void generate_ctor_or_dtor_function (bool, int, location_t *);
80 static int generate_ctor_and_dtor_functions_for_priority (splay_tree_node,
82 static tree prune_vars_needing_no_initialization (tree *);
83 static void write_out_vars (tree);
84 static void import_export_class (tree);
85 static tree get_guard_bits (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(()) varray_type pending_statics;
91 #define pending_statics_used \
92 (pending_statics ? pending_statics->elements_used : 0)
94 /* A list of functions which were declared inline, but which we
95 may need to emit outline anyway. */
96 static GTY(()) varray_type deferred_fns;
97 #define deferred_fns_used \
98 (deferred_fns ? deferred_fns->elements_used : 0)
100 /* Flag used when debugging spew.c */
102 extern int spew_debug;
104 /* Nonzero if we're done parsing and into end-of-file activities. */
108 /* Functions called along with real static constructors and destructors. */
114 /* Incorporate `const' and `volatile' qualifiers for member functions.
115 FUNCTION is a TYPE_DECL or a FUNCTION_DECL.
116 QUALS is a list of qualifiers. Returns any explicit
117 top-level qualifiers of the method's this pointer, anything other than
118 TYPE_UNQUALIFIED will be an extension. */
121 grok_method_quals (tree ctype, tree function, cp_cv_quals quals)
123 tree fntype = TREE_TYPE (function);
124 tree raises = TYPE_RAISES_EXCEPTIONS (fntype);
125 int type_quals = TYPE_UNQUALIFIED;
126 int this_quals = TYPE_UNQUALIFIED;
128 type_quals = quals & ~TYPE_QUAL_RESTRICT;
129 this_quals = quals & TYPE_QUAL_RESTRICT;
131 ctype = cp_build_qualified_type (ctype, type_quals);
132 fntype = build_method_type_directly (ctype, TREE_TYPE (fntype),
133 (TREE_CODE (fntype) == METHOD_TYPE
134 ? TREE_CHAIN (TYPE_ARG_TYPES (fntype))
135 : TYPE_ARG_TYPES (fntype)));
137 fntype = build_exception_variant (fntype, raises);
139 TREE_TYPE (function) = fntype;
143 /* Build a PARM_DECL with NAME and TYPE, and set DECL_ARG_TYPE
147 cp_build_parm_decl (tree name, tree type)
149 tree parm = build_decl (PARM_DECL, name, type);
150 /* DECL_ARG_TYPE is only used by the back end and the back end never
152 if (!processing_template_decl)
153 DECL_ARG_TYPE (parm) = type_passed_as (type);
157 /* Returns a PARM_DECL for a parameter of the indicated TYPE, with the
161 build_artificial_parm (tree name, tree type)
163 tree parm = cp_build_parm_decl (name, type);
164 DECL_ARTIFICIAL (parm) = 1;
165 /* All our artificial parms are implicitly `const'; they cannot be
167 TREE_READONLY (parm) = 1;
171 /* Constructors for types with virtual baseclasses need an "in-charge" flag
172 saying whether this constructor is responsible for initialization of
173 virtual baseclasses or not. All destructors also need this "in-charge"
174 flag, which additionally determines whether or not the destructor should
175 free the memory for the object.
177 This function adds the "in-charge" flag to member function FN if
178 appropriate. It is called from grokclassfn and tsubst.
179 FN must be either a constructor or destructor.
181 The in-charge flag follows the 'this' parameter, and is followed by the
182 VTT parm (if any), then the user-written parms. */
185 maybe_retrofit_in_chrg (tree fn)
187 tree basetype, arg_types, parms, parm, fntype;
189 /* If we've already add the in-charge parameter don't do it again. */
190 if (DECL_HAS_IN_CHARGE_PARM_P (fn))
193 /* When processing templates we can't know, in general, whether or
194 not we're going to have virtual baseclasses. */
195 if (processing_template_decl)
198 /* We don't need an in-charge parameter for constructors that don't
199 have virtual bases. */
200 if (DECL_CONSTRUCTOR_P (fn)
201 && !CLASSTYPE_VBASECLASSES (DECL_CONTEXT (fn)))
204 arg_types = TYPE_ARG_TYPES (TREE_TYPE (fn));
205 basetype = TREE_TYPE (TREE_VALUE (arg_types));
206 arg_types = TREE_CHAIN (arg_types);
208 parms = TREE_CHAIN (DECL_ARGUMENTS (fn));
210 /* If this is a subobject constructor or destructor, our caller will
211 pass us a pointer to our VTT. */
212 if (CLASSTYPE_VBASECLASSES (DECL_CONTEXT (fn)))
214 parm = build_artificial_parm (vtt_parm_identifier, vtt_parm_type);
216 /* First add it to DECL_ARGUMENTS between 'this' and the real args... */
217 TREE_CHAIN (parm) = parms;
220 /* ...and then to TYPE_ARG_TYPES. */
221 arg_types = hash_tree_chain (vtt_parm_type, arg_types);
223 DECL_HAS_VTT_PARM_P (fn) = 1;
226 /* Then add the in-charge parm (before the VTT parm). */
227 parm = build_artificial_parm (in_charge_identifier, integer_type_node);
228 TREE_CHAIN (parm) = parms;
230 arg_types = hash_tree_chain (integer_type_node, arg_types);
232 /* Insert our new parameter(s) into the list. */
233 TREE_CHAIN (DECL_ARGUMENTS (fn)) = parms;
235 /* And rebuild the function type. */
236 fntype = build_method_type_directly (basetype, TREE_TYPE (TREE_TYPE (fn)),
238 if (TYPE_RAISES_EXCEPTIONS (TREE_TYPE (fn)))
239 fntype = build_exception_variant (fntype,
240 TYPE_RAISES_EXCEPTIONS (TREE_TYPE (fn)));
241 TREE_TYPE (fn) = fntype;
243 /* Now we've got the in-charge parameter. */
244 DECL_HAS_IN_CHARGE_PARM_P (fn) = 1;
247 /* Classes overload their constituent function names automatically.
248 When a function name is declared in a record structure,
249 its name is changed to it overloaded name. Since names for
250 constructors and destructors can conflict, we place a leading
253 CNAME is the name of the class we are grokking for.
255 FUNCTION is a FUNCTION_DECL. It was created by `grokdeclarator'.
257 FLAGS contains bits saying what's special about today's
258 arguments. 1 == DESTRUCTOR. 2 == OPERATOR.
260 If FUNCTION is a destructor, then we must add the `auto-delete' field
261 as a second parameter. There is some hair associated with the fact
262 that we must "declare" this variable in the manner consistent with the
263 way the rest of the arguments were declared.
265 QUALS are the qualifiers for the this pointer. */
268 grokclassfn (tree ctype, tree function, enum overload_flags flags,
271 tree fn_name = DECL_NAME (function);
272 cp_cv_quals this_quals = TYPE_UNQUALIFIED;
274 /* Even within an `extern "C"' block, members get C++ linkage. See
275 [dcl.link] for details. */
276 SET_DECL_LANGUAGE (function, lang_cplusplus);
278 if (fn_name == NULL_TREE)
280 error ("name missing for member function");
281 fn_name = get_identifier ("<anonymous>");
282 DECL_NAME (function) = fn_name;
286 this_quals = grok_method_quals (ctype, function, quals);
288 if (TREE_CODE (TREE_TYPE (function)) == METHOD_TYPE)
290 /* Must add the class instance variable up front. */
291 /* Right now we just make this a pointer. But later
292 we may wish to make it special. */
293 tree type = TREE_VALUE (TYPE_ARG_TYPES (TREE_TYPE (function)));
297 /* The `this' parameter is implicitly `const'; it cannot be
299 this_quals |= TYPE_QUAL_CONST;
300 qual_type = cp_build_qualified_type (type, this_quals);
301 parm = build_artificial_parm (this_identifier, qual_type);
302 c_apply_type_quals_to_decl (this_quals, parm);
303 TREE_CHAIN (parm) = DECL_ARGUMENTS (function);
304 DECL_ARGUMENTS (function) = parm;
307 DECL_CONTEXT (function) = ctype;
309 if (flags == DTOR_FLAG)
310 DECL_DESTRUCTOR_P (function) = 1;
312 if (flags == DTOR_FLAG || DECL_CONSTRUCTOR_P (function))
313 maybe_retrofit_in_chrg (function);
316 /* Create an ARRAY_REF, checking for the user doing things backwards
320 grok_array_decl (tree array_expr, tree index_exp)
324 tree orig_array_expr = array_expr;
325 tree orig_index_exp = index_exp;
327 if (error_operand_p (array_expr) || error_operand_p (index_exp))
328 return error_mark_node;
330 if (processing_template_decl)
332 if (type_dependent_expression_p (array_expr)
333 || type_dependent_expression_p (index_exp))
334 return build_min_nt (ARRAY_REF, array_expr, index_exp,
335 NULL_TREE, NULL_TREE);
336 array_expr = build_non_dependent_expr (array_expr);
337 index_exp = build_non_dependent_expr (index_exp);
340 type = TREE_TYPE (array_expr);
342 type = non_reference (type);
344 /* If they have an `operator[]', use that. */
345 if (IS_AGGR_TYPE (type) || IS_AGGR_TYPE (TREE_TYPE (index_exp)))
346 expr = build_new_op (ARRAY_REF, LOOKUP_NORMAL,
347 array_expr, index_exp, NULL_TREE,
348 /*overloaded_p=*/NULL);
353 /* Otherwise, create an ARRAY_REF for a pointer or array type.
354 It is a little-known fact that, if `a' is an array and `i' is
355 an int, you can write `i[a]', which means the same thing as
357 if (TREE_CODE (type) == ARRAY_TYPE)
360 p1 = build_expr_type_conversion (WANT_POINTER, array_expr, false);
362 if (TREE_CODE (TREE_TYPE (index_exp)) == ARRAY_TYPE)
365 p2 = build_expr_type_conversion (WANT_POINTER, index_exp, false);
367 i1 = build_expr_type_conversion (WANT_INT | WANT_ENUM, array_expr,
369 i2 = build_expr_type_conversion (WANT_INT | WANT_ENUM, index_exp,
372 if ((p1 && i2) && (i1 && p2))
373 error ("ambiguous conversion for array subscript");
376 array_expr = p1, index_exp = i2;
378 array_expr = p2, index_exp = i1;
381 error ("invalid types %<%T[%T]%> for array subscript",
382 type, TREE_TYPE (index_exp));
383 return error_mark_node;
386 if (array_expr == error_mark_node || index_exp == error_mark_node)
387 error ("ambiguous conversion for array subscript");
389 expr = build_array_ref (array_expr, index_exp);
391 if (processing_template_decl && expr != error_mark_node)
392 return build_min_non_dep (ARRAY_REF, expr, orig_array_expr, orig_index_exp,
393 NULL_TREE, NULL_TREE);
397 /* Given the cast expression EXP, checking out its validity. Either return
398 an error_mark_node if there was an unavoidable error, return a cast to
399 void for trying to delete a pointer w/ the value 0, or return the
400 call to delete. If DOING_VEC is true, we handle things differently
401 for doing an array delete.
402 Implements ARM $5.3.4. This is called from the parser. */
405 delete_sanity (tree exp, tree size, bool doing_vec, int use_global_delete)
409 if (exp == error_mark_node)
412 if (processing_template_decl)
414 t = build_min (DELETE_EXPR, void_type_node, exp, size);
415 DELETE_EXPR_USE_GLOBAL (t) = use_global_delete;
416 DELETE_EXPR_USE_VEC (t) = doing_vec;
417 TREE_SIDE_EFFECTS (t) = 1;
421 exp = convert_from_reference (exp);
423 /* An array can't have been allocated by new, so complain. */
424 if (TREE_CODE (exp) == VAR_DECL
425 && TREE_CODE (TREE_TYPE (exp)) == ARRAY_TYPE)
426 warning ("deleting array %q#D", exp);
428 t = build_expr_type_conversion (WANT_POINTER, exp, true);
430 if (t == NULL_TREE || t == error_mark_node)
432 error ("type %q#T argument given to %<delete%>, expected pointer",
434 return error_mark_node;
437 type = TREE_TYPE (t);
439 /* As of Valley Forge, you can delete a pointer to const. */
441 /* You can't delete functions. */
442 if (TREE_CODE (TREE_TYPE (type)) == FUNCTION_TYPE)
444 error ("cannot delete a function. Only pointer-to-objects are "
445 "valid arguments to %<delete%>");
446 return error_mark_node;
449 /* Deleting ptr to void is undefined behavior [expr.delete/3]. */
450 if (TREE_CODE (TREE_TYPE (type)) == VOID_TYPE)
452 warning ("deleting %qT is undefined", type);
456 /* Deleting a pointer with the value zero is valid and has no effect. */
457 if (integer_zerop (t))
458 return build1 (NOP_EXPR, void_type_node, t);
461 return build_vec_delete (t, /*maxindex=*/NULL_TREE,
462 sfk_deleting_destructor,
465 return build_delete (type, t, sfk_deleting_destructor,
466 LOOKUP_NORMAL, use_global_delete);
469 /* Report an error if the indicated template declaration is not the
470 sort of thing that should be a member template. */
473 check_member_template (tree tmpl)
477 gcc_assert (TREE_CODE (tmpl) == TEMPLATE_DECL);
478 decl = DECL_TEMPLATE_RESULT (tmpl);
480 if (TREE_CODE (decl) == FUNCTION_DECL
481 || (TREE_CODE (decl) == TYPE_DECL
482 && IS_AGGR_TYPE (TREE_TYPE (decl))))
484 if (current_function_decl)
485 /* 14.5.2.2 [temp.mem]
487 A local class shall not have member templates. */
488 error ("invalid declaration of member template %q#D in local class",
491 if (TREE_CODE (decl) == FUNCTION_DECL && DECL_VIRTUAL_P (decl))
493 /* 14.5.2.3 [temp.mem]
495 A member function template shall not be virtual. */
497 ("invalid use of %<virtual%> in template declaration of %q#D",
499 DECL_VIRTUAL_P (decl) = 0;
502 /* The debug-information generating code doesn't know what to do
503 with member templates. */
504 DECL_IGNORED_P (tmpl) = 1;
507 error ("template declaration of %q#D", decl);
510 /* Return true iff TYPE is a valid Java parameter or return type. */
513 acceptable_java_type (tree type)
515 if (TREE_CODE (type) == VOID_TYPE || TYPE_FOR_JAVA (type))
517 if (TREE_CODE (type) == POINTER_TYPE || TREE_CODE (type) == REFERENCE_TYPE)
519 type = TREE_TYPE (type);
520 if (TREE_CODE (type) == RECORD_TYPE)
523 if (! TYPE_FOR_JAVA (type))
525 if (! CLASSTYPE_TEMPLATE_INFO (type))
527 args = CLASSTYPE_TI_ARGS (type);
528 i = TREE_VEC_LENGTH (args);
531 type = TREE_VEC_ELT (args, i);
532 if (TREE_CODE (type) == POINTER_TYPE)
533 type = TREE_TYPE (type);
534 if (! TYPE_FOR_JAVA (type))
543 /* For a METHOD in a Java class CTYPE, return true if
544 the parameter and return types are valid Java types.
545 Otherwise, print appropriate error messages, and return false. */
548 check_java_method (tree method)
551 tree arg_types = TYPE_ARG_TYPES (TREE_TYPE (method));
552 tree ret_type = TREE_TYPE (TREE_TYPE (method));
554 if (!acceptable_java_type (ret_type))
556 error ("Java method %qD has non-Java return type %qT",
561 arg_types = TREE_CHAIN (arg_types);
562 if (DECL_HAS_IN_CHARGE_PARM_P (method))
563 arg_types = TREE_CHAIN (arg_types);
564 if (DECL_HAS_VTT_PARM_P (method))
565 arg_types = TREE_CHAIN (arg_types);
567 for (; arg_types != NULL_TREE; arg_types = TREE_CHAIN (arg_types))
569 tree type = TREE_VALUE (arg_types);
570 if (!acceptable_java_type (type))
572 error ("Java method %qD has non-Java parameter type %qT",
580 /* Sanity check: report error if this function FUNCTION is not
581 really a member of the class (CTYPE) it is supposed to belong to.
582 TEMPLATE_PARMS is used to specify the template parameters of a member
583 template passed as FUNCTION_DECL. If the member template is passed as a
584 TEMPLATE_DECL, it can be NULL since the parameters can be extracted
585 from the declaration. If the function is not a function template, it
587 It returns the original declaration for the function, or NULL_TREE
588 if no declaration was found (and an error was emitted). */
591 check_classfn (tree ctype, tree function, tree template_parms)
596 if (DECL_USE_TEMPLATE (function)
597 && !(TREE_CODE (function) == TEMPLATE_DECL
598 && DECL_TEMPLATE_SPECIALIZATION (function))
599 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (function)))
600 /* Since this is a specialization of a member template,
601 we're not going to find the declaration in the class.
604 struct S { template <typename T> void f(T); };
605 template <> void S::f(int);
607 we're not going to find `S::f(int)', but there's no
608 reason we should, either. We let our callers know we didn't
609 find the method, but we don't complain. */
612 /* Basic sanity check: for a template function, the template parameters
613 either were not passed, or they are the same of DECL_TEMPLATE_PARMS. */
614 if (TREE_CODE (function) == TEMPLATE_DECL)
616 gcc_assert (!template_parms
617 || comp_template_parms (template_parms,
618 DECL_TEMPLATE_PARMS (function)));
619 template_parms = DECL_TEMPLATE_PARMS (function);
622 /* OK, is this a definition of a member template? */
623 is_template = (template_parms != NULL_TREE);
625 ix = class_method_index_for_fn (complete_type (ctype), function);
628 VEC(tree) *methods = CLASSTYPE_METHOD_VEC (ctype);
629 tree fndecls, fndecl = 0;
632 const char *format = NULL;
634 pop_p = push_scope (ctype);
635 for (fndecls = VEC_index (tree, methods, ix);
636 fndecls; fndecls = OVL_NEXT (fndecls))
640 fndecl = OVL_CURRENT (fndecls);
641 p1 = TYPE_ARG_TYPES (TREE_TYPE (function));
642 p2 = TYPE_ARG_TYPES (TREE_TYPE (fndecl));
644 /* We cannot simply call decls_match because this doesn't
645 work for static member functions that are pretending to
646 be methods, and because the name may have been changed by
649 /* Get rid of the this parameter on functions that become
651 if (DECL_STATIC_FUNCTION_P (fndecl)
652 && TREE_CODE (TREE_TYPE (function)) == METHOD_TYPE)
653 p1 = TREE_CHAIN (p1);
655 /* A member template definition only matches a member template
657 if (is_template != (TREE_CODE (fndecl) == TEMPLATE_DECL))
660 if (same_type_p (TREE_TYPE (TREE_TYPE (function)),
661 TREE_TYPE (TREE_TYPE (fndecl)))
662 && compparms (p1, p2)
664 || comp_template_parms (template_parms,
665 DECL_TEMPLATE_PARMS (fndecl)))
666 && (DECL_TEMPLATE_SPECIALIZATION (function)
667 == DECL_TEMPLATE_SPECIALIZATION (fndecl))
668 && (!DECL_TEMPLATE_SPECIALIZATION (function)
669 || (DECL_TI_TEMPLATE (function)
670 == DECL_TI_TEMPLATE (fndecl))))
676 return OVL_CURRENT (fndecls);
677 error ("prototype for `%#D' does not match any in class `%T'",
679 is_conv_op = DECL_CONV_FN_P (fndecl);
682 ix = CLASSTYPE_FIRST_CONVERSION_SLOT;
683 fndecls = VEC_index (tree, methods, ix);
686 fndecl = OVL_CURRENT (fndecls);
687 fndecls = OVL_NEXT (fndecls);
689 if (!fndecls && is_conv_op)
691 if (VEC_length (tree, methods) > (size_t) ++ix)
693 fndecls = VEC_index (tree, methods, ix);
694 if (!DECL_CONV_FN_P (OVL_CURRENT (fndecls)))
706 format = "candidates are: %#D";
708 format = "candidate is: %#D";
709 cp_error_at (format, fndecl);
712 else if (!COMPLETE_TYPE_P (ctype))
713 cxx_incomplete_type_error (function, ctype);
715 error ("no %q#D member function declared in class %qT",
718 /* If we did not find the method in the class, add it to avoid
719 spurious errors (unless the CTYPE is not yet defined, in which
720 case we'll only confuse ourselves when the function is declared
721 properly within the class. */
722 if (COMPLETE_TYPE_P (ctype))
723 add_method (ctype, function);
727 /* DECL is a function with vague linkage. Remember it so that at the
728 end of the translation unit we can decide whether or not to emit
732 note_vague_linkage_fn (tree decl)
734 if (!DECL_DEFERRED_FN (decl))
736 DECL_DEFERRED_FN (decl) = 1;
737 DECL_DEFER_OUTPUT (decl) = 1;
739 VARRAY_TREE_INIT (deferred_fns, 32, "deferred_fns");
740 VARRAY_PUSH_TREE (deferred_fns, decl);
744 /* Like note_vague_linkage_fn but for variables. */
747 note_vague_linkage_var (tree var)
749 if (!pending_statics)
750 VARRAY_TREE_INIT (pending_statics, 32, "pending_statics");
751 VARRAY_PUSH_TREE (pending_statics, var);
754 /* We have just processed the DECL, which is a static data member.
755 Its initializer, if present, is INIT. The ASMSPEC_TREE, if
756 present, is the assembly-language name for the data member.
757 FLAGS is as for cp_finish_decl. */
760 finish_static_data_member_decl (tree decl, tree init, tree asmspec_tree,
763 gcc_assert (TREE_PUBLIC (decl));
765 DECL_CONTEXT (decl) = current_class_type;
767 /* We cannot call pushdecl here, because that would fill in the
768 TREE_CHAIN of our decl. Instead, we modify cp_finish_decl to do
769 the right thing, namely, to put this decl out straight away. */
770 /* current_class_type can be NULL_TREE in case of error. */
771 if (!asmspec_tree && current_class_type)
772 DECL_INITIAL (decl) = error_mark_node;
774 if (! processing_template_decl)
775 note_vague_linkage_var (decl);
777 if (LOCAL_CLASS_P (current_class_type))
778 pedwarn ("local class %q#T shall not have static data member %q#D",
779 current_class_type, decl);
781 /* Static consts need not be initialized in the class definition. */
782 if (init != NULL_TREE && TYPE_NEEDS_CONSTRUCTING (TREE_TYPE (decl)))
784 static int explained = 0;
786 error ("initializer invalid for static member with constructor");
789 error ("(an out of class initialization is required)");
794 /* Force the compiler to know when an uninitialized static const
795 member is being used. */
796 if (CP_TYPE_CONST_P (TREE_TYPE (decl)) && init == 0)
797 TREE_USED (decl) = 1;
798 DECL_INITIAL (decl) = init;
799 DECL_IN_AGGR_P (decl) = 1;
801 cp_finish_decl (decl, init, asmspec_tree, flags);
804 /* Process the specs, declarator (NULL if omitted) and width (NULL if omitted)
805 of a structure component, returning a _DECL node.
806 QUALS is a list of type qualifiers for this decl (such as for declaring
807 const member functions).
809 This is done during the parsing of the struct declaration.
810 The _DECL nodes are chained together and the lot of them
811 are ultimately passed to `build_struct' to make the RECORD_TYPE node.
813 If class A defines that certain functions in class B are friends, then
814 the way I have set things up, it is B who is interested in permission
815 granted by A. However, it is in A's context that these declarations
816 are parsed. By returning a void_type_node, class A does not attempt
817 to incorporate the declarations of the friends within its structure.
819 DO NOT MAKE ANY CHANGES TO THIS CODE WITHOUT MAKING CORRESPONDING
820 CHANGES TO CODE IN `start_method'. */
823 grokfield (const cp_declarator *declarator,
824 cp_decl_specifier_seq *declspecs,
825 tree init, tree asmspec_tree,
829 const char *asmspec = 0;
830 int flags = LOOKUP_ONLYCONVERTING;
832 if (!declspecs->any_specifiers_p
833 && declarator->kind == cdk_id
834 && TREE_CODE (declarator->u.id.name) == SCOPE_REF
835 && (TREE_CODE (TREE_OPERAND (declarator->u.id.name, 1))
837 /* Access declaration */
838 return do_class_using_decl (declarator->u.id.name);
841 && TREE_CODE (init) == TREE_LIST
842 && TREE_VALUE (init) == error_mark_node
843 && TREE_CHAIN (init) == NULL_TREE)
846 value = grokdeclarator (declarator, declspecs, FIELD, init != 0, &attrlist);
847 if (! value || error_operand_p (value))
848 /* friend or constructor went bad. */
849 return error_mark_node;
851 if (TREE_CODE (value) == TYPE_DECL && init)
853 error ("typedef %qD is initialized (use __typeof__ instead)", value);
857 /* Pass friendly classes back. */
858 if (value == void_type_node)
861 /* Pass friend decls back. */
862 if ((TREE_CODE (value) == FUNCTION_DECL
863 || TREE_CODE (value) == TEMPLATE_DECL)
864 && DECL_CONTEXT (value) != current_class_type)
867 if (DECL_NAME (value) != NULL_TREE
868 && IDENTIFIER_POINTER (DECL_NAME (value))[0] == '_'
869 && ! strcmp (IDENTIFIER_POINTER (DECL_NAME (value)), "_vptr"))
870 error ("member %qD conflicts with virtual function table field name",
873 /* Stash away type declarations. */
874 if (TREE_CODE (value) == TYPE_DECL)
876 DECL_NONLOCAL (value) = 1;
877 DECL_CONTEXT (value) = current_class_type;
879 if (processing_template_decl)
880 value = push_template_decl (value);
885 if (DECL_IN_AGGR_P (value))
887 error ("%qD is already defined in %qT", value, DECL_CONTEXT (value));
888 return void_type_node;
892 asmspec = TREE_STRING_POINTER (asmspec_tree);
896 if (TREE_CODE (value) == FUNCTION_DECL)
898 grok_function_init (value, init);
901 else if (pedantic && TREE_CODE (value) != VAR_DECL)
902 /* Already complained in grokdeclarator. */
906 /* We allow initializers to become parameters to base
908 if (TREE_CODE (init) == TREE_LIST)
910 if (TREE_CHAIN (init) == NULL_TREE)
911 init = TREE_VALUE (init);
913 init = digest_init (TREE_TYPE (value), init, (tree *)0);
916 if (!processing_template_decl)
918 if (TREE_CODE (init) == CONST_DECL)
919 init = DECL_INITIAL (init);
920 else if (TREE_READONLY_DECL_P (init))
921 init = decl_constant_value (init);
922 else if (TREE_CODE (init) == CONSTRUCTOR)
923 init = digest_init (TREE_TYPE (value), init, (tree *)0);
924 if (init != error_mark_node && ! TREE_CONSTANT (init))
926 /* We can allow references to things that are effectively
927 static, since references are initialized with the
929 if (TREE_CODE (TREE_TYPE (value)) != REFERENCE_TYPE
930 || (TREE_STATIC (init) == 0
931 && (!DECL_P (init) || DECL_EXTERNAL (init) == 0)))
933 error ("field initializer is not constant");
934 init = error_mark_node;
941 if (processing_template_decl
942 && (TREE_CODE (value) == VAR_DECL || TREE_CODE (value) == FUNCTION_DECL))
944 value = push_template_decl (value);
945 if (error_operand_p (value))
946 return error_mark_node;
950 cplus_decl_attributes (&value, attrlist, 0);
952 switch (TREE_CODE (value))
955 finish_static_data_member_decl (value, init, asmspec_tree,
961 error ("`asm' specifiers are not permitted on non-static data members");
962 if (DECL_INITIAL (value) == error_mark_node)
963 init = error_mark_node;
964 cp_finish_decl (value, init, NULL_TREE, flags);
965 DECL_INITIAL (value) = init;
966 DECL_IN_AGGR_P (value) = 1;
971 set_user_assembler_name (value, asmspec);
972 if (!DECL_FRIEND_P (value))
973 grok_special_member_properties (value);
975 cp_finish_decl (value, init, asmspec_tree, flags);
977 /* Pass friends back this way. */
978 if (DECL_FRIEND_P (value))
979 return void_type_node;
981 DECL_IN_AGGR_P (value) = 1;
990 /* Like `grokfield', but for bitfields.
991 WIDTH is non-NULL for bit fields only, and is an INTEGER_CST node. */
994 grokbitfield (const cp_declarator *declarator,
995 cp_decl_specifier_seq *declspecs, tree width)
997 tree value = grokdeclarator (declarator, declspecs, BITFIELD, 0, NULL);
999 if (! value) return NULL_TREE; /* friends went bad. */
1001 /* Pass friendly classes back. */
1002 if (TREE_CODE (value) == VOID_TYPE)
1003 return void_type_node;
1005 if (TREE_CODE (value) == TYPE_DECL)
1007 error ("cannot declare %qD to be a bit-field type", value);
1011 /* Usually, finish_struct_1 catches bitfields with invalid types.
1012 But, in the case of bitfields with function type, we confuse
1013 ourselves into thinking they are member functions, so we must
1015 if (TREE_CODE (value) == FUNCTION_DECL)
1017 error ("cannot declare bit-field %qD with function type",
1022 if (DECL_IN_AGGR_P (value))
1024 error ("%qD is already defined in the class %qT", value,
1025 DECL_CONTEXT (value));
1026 return void_type_node;
1029 if (TREE_STATIC (value))
1031 error ("static member %qD cannot be a bit-field", value);
1034 cp_finish_decl (value, NULL_TREE, NULL_TREE, 0);
1036 if (width != error_mark_node)
1038 constant_expression_warning (width);
1039 DECL_INITIAL (value) = width;
1040 SET_DECL_C_BIT_FIELD (value);
1043 DECL_IN_AGGR_P (value) = 1;
1047 /* When a function is declared with an initializer,
1048 do the right thing. Currently, there are two possibilities:
1053 // initialization possibility #1.
1054 virtual void f () = 0;
1076 // initialization possibility #2
1083 grok_function_init (tree decl, tree init)
1085 /* An initializer for a function tells how this function should
1087 tree type = TREE_TYPE (decl);
1089 if (TREE_CODE (type) == FUNCTION_TYPE)
1090 error ("initializer specified for non-member function %qD", decl);
1091 else if (integer_zerop (init))
1092 DECL_PURE_VIRTUAL_P (decl) = 1;
1094 error ("invalid initializer for virtual method %qD", decl);
1098 cplus_decl_attributes (tree *decl, tree attributes, int flags)
1100 if (*decl == NULL_TREE || *decl == void_type_node)
1103 if (TREE_CODE (*decl) == TEMPLATE_DECL)
1104 decl = &DECL_TEMPLATE_RESULT (*decl);
1106 decl_attributes (decl, attributes, flags);
1108 if (TREE_CODE (*decl) == TYPE_DECL)
1109 SET_IDENTIFIER_TYPE_VALUE (DECL_NAME (*decl), TREE_TYPE (*decl));
1112 /* Walks through the namespace- or function-scope anonymous union OBJECT,
1113 building appropriate ALIAS_DECLs. Returns one of the fields for use in
1114 the mangled name. */
1117 build_anon_union_vars (tree object)
1119 tree type = TREE_TYPE (object);
1120 tree main_decl = NULL_TREE;
1123 /* Rather than write the code to handle the non-union case,
1124 just give an error. */
1125 if (TREE_CODE (type) != UNION_TYPE)
1126 error ("anonymous struct not inside named type");
1128 for (field = TYPE_FIELDS (type);
1130 field = TREE_CHAIN (field))
1135 if (DECL_ARTIFICIAL (field))
1137 if (TREE_CODE (field) != FIELD_DECL)
1139 cp_pedwarn_at ("%q#D invalid; an anonymous union can only "
1140 "have non-static data members",
1145 if (TREE_PRIVATE (field))
1146 cp_pedwarn_at ("private member %q#D in anonymous union", field);
1147 else if (TREE_PROTECTED (field))
1148 cp_pedwarn_at ("protected member %q#D in anonymous union", field);
1150 if (processing_template_decl)
1151 ref = build_min_nt (COMPONENT_REF, object,
1152 DECL_NAME (field), NULL_TREE);
1154 ref = build_class_member_access_expr (object, field, NULL_TREE,
1157 if (DECL_NAME (field))
1159 decl = build_decl (ALIAS_DECL, DECL_NAME (field), TREE_TYPE (field));
1160 DECL_INITIAL (decl) = ref;
1161 TREE_PUBLIC (decl) = 0;
1162 TREE_STATIC (decl) = 0;
1163 DECL_EXTERNAL (decl) = 1;
1164 decl = pushdecl (decl);
1166 else if (ANON_AGGR_TYPE_P (TREE_TYPE (field)))
1167 decl = build_anon_union_vars (ref);
1171 if (main_decl == NULL_TREE)
1178 /* Finish off the processing of a UNION_TYPE structure. If the union is an
1179 anonymous union, then all members must be laid out together. PUBLIC_P
1180 is nonzero if this union is not declared static. */
1183 finish_anon_union (tree anon_union_decl)
1185 tree type = TREE_TYPE (anon_union_decl);
1187 bool public_p = TREE_PUBLIC (anon_union_decl);
1189 /* The VAR_DECL's context is the same as the TYPE's context. */
1190 DECL_CONTEXT (anon_union_decl) = DECL_CONTEXT (TYPE_NAME (type));
1192 if (TYPE_FIELDS (type) == NULL_TREE)
1197 error ("namespace-scope anonymous aggregates must be static");
1201 main_decl = build_anon_union_vars (anon_union_decl);
1202 if (main_decl == NULL_TREE)
1204 warning ("anonymous union with no members");
1208 if (!processing_template_decl)
1210 /* Use main_decl to set the mangled name. */
1211 DECL_NAME (anon_union_decl) = DECL_NAME (main_decl);
1212 mangle_decl (anon_union_decl);
1213 DECL_NAME (anon_union_decl) = NULL_TREE;
1216 pushdecl (anon_union_decl);
1217 if (building_stmt_tree ()
1218 && at_function_scope_p ())
1219 add_decl_expr (anon_union_decl);
1220 else if (!processing_template_decl)
1221 rest_of_decl_compilation (anon_union_decl,
1222 toplevel_bindings_p (), at_eof);
1225 /* Auxiliary functions to make type signatures for
1226 `operator new' and `operator delete' correspond to
1227 what compiler will be expecting. */
1230 coerce_new_type (tree type)
1233 tree args = TYPE_ARG_TYPES (type);
1235 gcc_assert (TREE_CODE (type) == FUNCTION_TYPE);
1237 if (!same_type_p (TREE_TYPE (type), ptr_type_node))
1240 error ("%<operator new%> must return type %qT", ptr_type_node);
1243 if (!args || args == void_list_node
1244 || !same_type_p (TREE_VALUE (args), size_type_node))
1247 if (args && args != void_list_node)
1248 args = TREE_CHAIN (args);
1249 pedwarn ("%<operator new%> takes type %<size_t%> (%qT) "
1250 "as first parameter", size_type_node);
1255 args = tree_cons (NULL_TREE, size_type_node, args);
1258 type = build_exception_variant
1259 (build_function_type (ptr_type_node, args),
1260 TYPE_RAISES_EXCEPTIONS (type));
1268 coerce_delete_type (tree type)
1271 tree args = TYPE_ARG_TYPES (type);
1273 gcc_assert (TREE_CODE (type) == FUNCTION_TYPE);
1275 if (!same_type_p (TREE_TYPE (type), void_type_node))
1278 error ("%<operator delete%> must return type %qT", void_type_node);
1281 if (!args || args == void_list_node
1282 || !same_type_p (TREE_VALUE (args), ptr_type_node))
1285 if (args && args != void_list_node)
1286 args = TREE_CHAIN (args);
1287 error ("%<operator delete%> takes type %qT as first parameter",
1293 args = tree_cons (NULL_TREE, ptr_type_node, args);
1296 type = build_exception_variant
1297 (build_function_type (void_type_node, args),
1298 TYPE_RAISES_EXCEPTIONS (type));
1307 mark_vtable_entries (tree decl)
1309 tree entries = CONSTRUCTOR_ELTS (DECL_INITIAL (decl));
1311 for (; entries; entries = TREE_CHAIN (entries))
1313 tree fnaddr = TREE_VALUE (entries);
1316 STRIP_NOPS (fnaddr);
1318 if (TREE_CODE (fnaddr) != ADDR_EXPR
1319 && TREE_CODE (fnaddr) != FDESC_EXPR)
1320 /* This entry is an offset: a virtual base class offset, a
1321 virtual call offset, an RTTI offset, etc. */
1324 fn = TREE_OPERAND (fnaddr, 0);
1325 TREE_ADDRESSABLE (fn) = 1;
1326 /* When we don't have vcall offsets, we output thunks whenever
1327 we output the vtables that contain them. With vcall offsets,
1328 we know all the thunks we'll need when we emit a virtual
1329 function, so we emit the thunks there instead. */
1330 if (DECL_THUNK_P (fn))
1331 use_thunk (fn, /*emit_p=*/0);
1336 /* Set DECL up to have the closest approximation of "initialized common"
1337 linkage available. */
1340 comdat_linkage (tree decl)
1343 make_decl_one_only (decl);
1344 else if (TREE_CODE (decl) == FUNCTION_DECL
1345 || (TREE_CODE (decl) == VAR_DECL && DECL_ARTIFICIAL (decl)))
1346 /* We can just emit function and compiler-generated variables
1347 statically; having multiple copies is (for the most part) only
1350 There are two correctness issues, however: the address of a
1351 template instantiation with external linkage should be the
1352 same, independent of what translation unit asks for the
1353 address, and this will not hold when we emit multiple copies of
1354 the function. However, there's little else we can do.
1356 Also, by default, the typeinfo implementation assumes that
1357 there will be only one copy of the string used as the name for
1358 each type. Therefore, if weak symbols are unavailable, the
1359 run-time library should perform a more conservative check; it
1360 should perform a string comparison, rather than an address
1362 TREE_PUBLIC (decl) = 0;
1365 /* Static data member template instantiations, however, cannot
1366 have multiple copies. */
1367 if (DECL_INITIAL (decl) == 0
1368 || DECL_INITIAL (decl) == error_mark_node)
1369 DECL_COMMON (decl) = 1;
1370 else if (EMPTY_CONSTRUCTOR_P (DECL_INITIAL (decl)))
1372 DECL_COMMON (decl) = 1;
1373 DECL_INITIAL (decl) = error_mark_node;
1375 else if (!DECL_EXPLICIT_INSTANTIATION (decl))
1377 /* We can't do anything useful; leave vars for explicit
1379 DECL_EXTERNAL (decl) = 1;
1380 DECL_NOT_REALLY_EXTERN (decl) = 0;
1384 if (DECL_LANG_SPECIFIC (decl))
1385 DECL_COMDAT (decl) = 1;
1388 /* For win32 we also want to put explicit instantiations in
1389 linkonce sections, so that they will be merged with implicit
1390 instantiations; otherwise we get duplicate symbol errors.
1391 For Darwin we do not want explicit instantiations to be
1395 maybe_make_one_only (tree decl)
1397 /* We used to say that this was not necessary on targets that support weak
1398 symbols, because the implicit instantiations will defer to the explicit
1399 one. However, that's not actually the case in SVR4; a strong definition
1400 after a weak one is an error. Also, not making explicit
1401 instantiations one_only means that we can end up with two copies of
1402 some template instantiations. */
1406 /* We can't set DECL_COMDAT on functions, or cp_finish_file will think
1407 we can get away with not emitting them if they aren't used. We need
1408 to for variables so that cp_finish_decl will update their linkage,
1409 because their DECL_INITIAL may not have been set properly yet. */
1411 if (!TARGET_WEAK_NOT_IN_ARCHIVE_TOC
1412 || (! DECL_EXPLICIT_INSTANTIATION (decl)
1413 && ! DECL_TEMPLATE_SPECIALIZATION (decl)))
1415 make_decl_one_only (decl);
1417 if (TREE_CODE (decl) == VAR_DECL)
1419 DECL_COMDAT (decl) = 1;
1420 /* Mark it needed so we don't forget to emit it. */
1421 mark_decl_referenced (decl);
1426 /* Determine whether or not we want to specifically import or export CTYPE,
1427 using various heuristics. */
1430 import_export_class (tree ctype)
1432 /* -1 for imported, 1 for exported. */
1433 int import_export = 0;
1435 /* It only makes sense to call this function at EOF. The reason is
1436 that this function looks at whether or not the first non-inline
1437 non-abstract virtual member function has been defined in this
1438 translation unit. But, we can't possibly know that until we've
1439 seen the entire translation unit. */
1440 gcc_assert (at_eof);
1442 if (CLASSTYPE_INTERFACE_KNOWN (ctype))
1445 /* If MULTIPLE_SYMBOL_SPACES is set and we saw a #pragma interface,
1446 we will have CLASSTYPE_INTERFACE_ONLY set but not
1447 CLASSTYPE_INTERFACE_KNOWN. In that case, we don't want to use this
1448 heuristic because someone will supply a #pragma implementation
1449 elsewhere, and deducing it here would produce a conflict. */
1450 if (CLASSTYPE_INTERFACE_ONLY (ctype))
1453 if (lookup_attribute ("dllimport", TYPE_ATTRIBUTES (ctype)))
1455 else if (lookup_attribute ("dllexport", TYPE_ATTRIBUTES (ctype)))
1457 else if (CLASSTYPE_IMPLICIT_INSTANTIATION (ctype)
1458 && !flag_implicit_templates)
1459 /* For a template class, without -fimplicit-templates, check the
1460 repository. If the virtual table is assigned to this
1461 translation unit, then export the class; otherwise, import
1463 import_export = repo_export_class_p (ctype) ? 1 : -1;
1464 else if (TYPE_POLYMORPHIC_P (ctype))
1466 /* The ABI specifies that the virtual table and associated
1467 information are emitted with the key method, if any. */
1468 tree method = CLASSTYPE_KEY_METHOD (ctype);
1469 /* If weak symbol support is not available, then we must be
1470 careful not to emit the vtable when the key function is
1471 inline. An inline function can be defined in multiple
1472 translation units. If we were to emit the vtable in each
1473 translation unit containing a definition, we would get
1474 multiple definition errors at link-time. */
1475 if (method && (flag_weak || ! DECL_DECLARED_INLINE_P (method)))
1476 import_export = (DECL_REALLY_EXTERN (method) ? -1 : 1);
1479 /* When MULTIPLE_SYMBOL_SPACES is set, we cannot count on seeing
1480 a definition anywhere else. */
1481 if (MULTIPLE_SYMBOL_SPACES && import_export == -1)
1484 /* Allow backends the chance to overrule the decision. */
1485 if (targetm.cxx.import_export_class)
1486 import_export = targetm.cxx.import_export_class (ctype, import_export);
1490 SET_CLASSTYPE_INTERFACE_KNOWN (ctype);
1491 CLASSTYPE_INTERFACE_ONLY (ctype) = (import_export < 0);
1495 /* Return true if VAR has already been provided to the back end; in that
1496 case VAR should not be modified further by the front end. */
1498 var_finalized_p (tree var)
1500 return cgraph_varpool_node (var)->finalized;
1503 /* DECL is a VAR_DECL or FUNCTION_DECL which, for whatever reason,
1504 must be emitted in this translation unit. Mark it as such. */
1507 mark_needed (tree decl)
1509 /* It's possible that we no longer need to set
1510 TREE_SYMBOL_REFERENCED here directly, but doing so is
1512 TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)) = 1;
1513 mark_decl_referenced (decl);
1516 /* DECL is either a FUNCTION_DECL or a VAR_DECL. This function
1517 returns true if a definition of this entity should be provided in
1518 this object file. Callers use this function to determine whether
1519 or not to let the back end know that a definition of DECL is
1520 available in this translation unit. */
1523 decl_needed_p (tree decl)
1525 gcc_assert (TREE_CODE (decl) == VAR_DECL
1526 || TREE_CODE (decl) == FUNCTION_DECL);
1527 /* This function should only be called at the end of the translation
1528 unit. We cannot be sure of whether or not something will be
1529 COMDAT until that point. */
1530 gcc_assert (at_eof);
1532 /* All entities with external linkage that are not COMDAT should be
1533 emitted; they may be referred to from other object files. */
1534 if (TREE_PUBLIC (decl) && !DECL_COMDAT (decl))
1536 /* If this entity was used, let the back-end see it; it will decide
1537 whether or not to emit it into the object file. */
1538 if (TREE_USED (decl)
1539 || (DECL_ASSEMBLER_NAME_SET_P (decl)
1540 && TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))))
1542 /* Otherwise, DECL does not need to be emitted -- yet. A subsequent
1543 reference to DECL might cause it to be emitted later. */
1547 /* If necessary, write out the vtables for the dynamic class CTYPE.
1548 Returns true if any vtables were emitted. */
1551 maybe_emit_vtables (tree ctype)
1557 /* If the vtables for this class have already been emitted there is
1558 nothing more to do. */
1559 primary_vtbl = CLASSTYPE_VTABLES (ctype);
1560 if (var_finalized_p (primary_vtbl))
1562 /* Ignore dummy vtables made by get_vtable_decl. */
1563 if (TREE_TYPE (primary_vtbl) == void_type_node)
1566 /* On some targets, we cannot determine the key method until the end
1567 of the translation unit -- which is when this function is
1569 if (!targetm.cxx.key_method_may_be_inline ())
1570 determine_key_method (ctype);
1572 /* See if any of the vtables are needed. */
1573 for (vtbl = CLASSTYPE_VTABLES (ctype); vtbl; vtbl = TREE_CHAIN (vtbl))
1575 import_export_decl (vtbl);
1576 if (DECL_NOT_REALLY_EXTERN (vtbl) && decl_needed_p (vtbl))
1581 /* If the references to this class' vtables are optimized away,
1582 still emit the appropriate debugging information. See
1584 if (DECL_COMDAT (primary_vtbl)
1585 && CLASSTYPE_DEBUG_REQUESTED (ctype))
1586 note_debug_info_needed (ctype);
1590 /* The ABI requires that we emit all of the vtables if we emit any
1592 for (vtbl = CLASSTYPE_VTABLES (ctype); vtbl; vtbl = TREE_CHAIN (vtbl))
1594 /* Mark entities references from the virtual table as used. */
1595 mark_vtable_entries (vtbl);
1597 if (TREE_TYPE (DECL_INITIAL (vtbl)) == 0)
1599 tree expr = store_init_value (vtbl, DECL_INITIAL (vtbl));
1601 /* It had better be all done at compile-time. */
1606 DECL_EXTERNAL (vtbl) = 0;
1607 rest_of_decl_compilation (vtbl, 1, 1);
1609 /* Because we're only doing syntax-checking, we'll never end up
1610 actually marking the variable as written. */
1611 if (flag_syntax_only)
1612 TREE_ASM_WRITTEN (vtbl) = 1;
1615 /* Since we're writing out the vtable here, also write the debug
1617 note_debug_info_needed (ctype);
1622 /* Like c_determine_visibility, but with additional C++-specific
1626 determine_visibility (tree decl)
1630 /* Cloned constructors and destructors get the same visibility as
1631 the underlying function. That should be set up in
1632 maybe_clone_body. */
1633 gcc_assert (!DECL_CLONED_FUNCTION_P (decl));
1635 /* Give the common code a chance to make a determination. */
1636 if (c_determine_visibility (decl))
1639 /* If DECL is a member of a class, visibility specifiers on the
1640 class can influence the visibility of the DECL. */
1641 if (DECL_CLASS_SCOPE_P (decl))
1642 class_type = DECL_CONTEXT (decl);
1643 else if (TREE_CODE (decl) == VAR_DECL
1644 && DECL_TINFO_P (decl)
1645 && CLASS_TYPE_P (TREE_TYPE (DECL_NAME (decl))))
1646 class_type = TREE_TYPE (DECL_NAME (decl));
1649 /* Virtual tables have DECL_CONTEXT set to their associated class,
1650 so they are automatically handled above. */
1651 gcc_assert (TREE_CODE (decl) != VAR_DECL
1652 || !DECL_VTABLE_OR_VTT_P (decl));
1653 /* Entities not associated with any class just get the
1654 visibility specified by their attributes. */
1658 /* By default, static data members and function members receive
1659 the visibility of their containing class. */
1662 if (TARGET_DLLIMPORT_DECL_ATTRIBUTES
1663 && lookup_attribute ("dllexport", TYPE_ATTRIBUTES (class_type)))
1665 DECL_VISIBILITY (decl) = VISIBILITY_DEFAULT;
1666 DECL_VISIBILITY_SPECIFIED (decl) = 1;
1668 else if (TREE_CODE (decl) == FUNCTION_DECL
1669 && DECL_DECLARED_INLINE_P (decl)
1670 && visibility_options.inlines_hidden)
1672 DECL_VISIBILITY (decl) = VISIBILITY_HIDDEN;
1673 DECL_VISIBILITY_SPECIFIED (decl) = 1;
1675 else if (CLASSTYPE_VISIBILITY_SPECIFIED (class_type))
1677 DECL_VISIBILITY (decl) = CLASSTYPE_VISIBILITY (class_type);
1678 DECL_VISIBILITY_SPECIFIED (decl) = 1;
1680 /* If no explicit visibility information has been provided for
1681 this class, some targets require that class data be
1683 else if (TREE_CODE (decl) == VAR_DECL
1684 && targetm.cxx.export_class_data ()
1685 && (DECL_TINFO_P (decl)
1686 || (DECL_VTABLE_OR_VTT_P (decl)
1687 /* Construction virtual tables are not emitted
1688 because they cannot be referred to from other
1689 object files; their name is not standardized by
1691 && !DECL_CONSTRUCTION_VTABLE_P (decl))))
1692 DECL_VISIBILITY (decl) = VISIBILITY_DEFAULT;
1695 DECL_VISIBILITY (decl) = CLASSTYPE_VISIBILITY (class_type);
1696 DECL_VISIBILITY_SPECIFIED (decl) = 0;
1701 /* DECL is a FUNCTION_DECL or VAR_DECL. If the object file linkage
1702 for DECL has not already been determined, do so now by setting
1703 DECL_EXTERNAL, DECL_COMDAT and other related flags. Until this
1704 function is called entities with vague linkage whose definitions
1705 are available must have TREE_PUBLIC set.
1707 If this function decides to place DECL in COMDAT, it will set
1708 appropriate flags -- but will not clear DECL_EXTERNAL. It is up to
1709 the caller to decide whether or not to clear DECL_EXTERNAL. Some
1710 callers defer that decision until it is clear that DECL is actually
1714 import_export_decl (tree decl)
1720 if (DECL_INTERFACE_KNOWN (decl))
1723 /* We cannot determine what linkage to give to an entity with vague
1724 linkage until the end of the file. For example, a virtual table
1725 for a class will be defined if and only if the key method is
1726 defined in this translation unit. As a further example, consider
1727 that when compiling a translation unit that uses PCH file with
1728 "-frepo" it would be incorrect to make decisions about what
1729 entities to emit when building the PCH; those decisions must be
1730 delayed until the repository information has been processed. */
1731 gcc_assert (at_eof);
1732 /* Object file linkage for explicit instantiations is handled in
1733 mark_decl_instantiated. For static variables in functions with
1734 vague linkage, maybe_commonize_var is used.
1736 Therefore, the only declarations that should be provided to this
1737 function are those with external linkage that:
1739 * implicit instantiations of function templates
1743 * implicit instantiations of static data members of class
1750 Furthermore, all entities that reach this point must have a
1751 definition available in this translation unit.
1753 The following assertions check these conditions. */
1754 gcc_assert (TREE_CODE (decl) == FUNCTION_DECL
1755 || TREE_CODE (decl) == VAR_DECL);
1756 /* Any code that creates entities with TREE_PUBLIC cleared should
1757 also set DECL_INTERFACE_KNOWN. */
1758 gcc_assert (TREE_PUBLIC (decl));
1759 if (TREE_CODE (decl) == FUNCTION_DECL)
1760 gcc_assert (DECL_IMPLICIT_INSTANTIATION (decl)
1761 || DECL_FRIEND_PSEUDO_TEMPLATE_INSTANTIATION (decl)
1762 || DECL_DECLARED_INLINE_P (decl));
1764 gcc_assert (DECL_IMPLICIT_INSTANTIATION (decl)
1765 || DECL_VTABLE_OR_VTT_P (decl)
1766 || DECL_TINFO_P (decl));
1767 /* Check that a definition of DECL is available in this translation
1769 gcc_assert (!DECL_REALLY_EXTERN (decl));
1771 /* Assume that DECL will not have COMDAT linkage. */
1773 /* Assume that DECL will not be imported into this translation
1777 /* See if the repository tells us whether or not to emit DECL in
1778 this translation unit. */
1779 emit_p = repo_emit_p (decl);
1782 else if (emit_p == 1)
1784 /* The repository indicates that this entity should be defined
1785 here. Make sure the back end honors that request. */
1786 if (TREE_CODE (decl) == VAR_DECL)
1788 else if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (decl)
1789 || DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P (decl))
1792 FOR_EACH_CLONE (clone, decl)
1793 mark_needed (clone);
1797 /* Output the definition as an ordinary strong definition. */
1798 DECL_EXTERNAL (decl) = 0;
1799 DECL_INTERFACE_KNOWN (decl) = 1;
1804 /* We have already decided what to do with this DECL; there is no
1805 need to check anything further. */
1807 else if (TREE_CODE (decl) == VAR_DECL && DECL_VTABLE_OR_VTT_P (decl))
1809 tree type = DECL_CONTEXT (decl);
1810 import_export_class (type);
1811 if (TYPE_FOR_JAVA (type))
1813 else if (CLASSTYPE_INTERFACE_KNOWN (type)
1814 && CLASSTYPE_INTERFACE_ONLY (type))
1816 else if (TARGET_WEAK_NOT_IN_ARCHIVE_TOC
1817 && !CLASSTYPE_USE_TEMPLATE (type)
1818 && CLASSTYPE_KEY_METHOD (type)
1819 && !DECL_DECLARED_INLINE_P (CLASSTYPE_KEY_METHOD (type)))
1820 /* The ABI requires that all virtual tables be emitted with
1821 COMDAT linkage. However, on systems where COMDAT symbols
1822 don't show up in the table of contents for a static
1823 archive, the linker will report errors about undefined
1824 symbols because it will not see the virtual table
1825 definition. Therefore, in the case that we know that the
1826 virtual table will be emitted in only one translation
1827 unit, we make the virtual table an ordinary definition
1828 with external linkage. */
1829 DECL_EXTERNAL (decl) = 0;
1830 else if (CLASSTYPE_INTERFACE_KNOWN (type))
1832 /* TYPE is being exported from this translation unit, so DECL
1833 should be defined here. The ABI requires COMDAT
1834 linkage. Normally, we only emit COMDAT things when they
1835 are needed; make sure that we realize that this entity is
1840 else if (!flag_implicit_templates
1841 && CLASSTYPE_IMPLICIT_INSTANTIATION (type))
1846 else if (TREE_CODE (decl) == VAR_DECL && DECL_TINFO_P (decl))
1848 tree type = TREE_TYPE (DECL_NAME (decl));
1849 if (CLASS_TYPE_P (type))
1851 import_export_class (type);
1852 if (CLASSTYPE_INTERFACE_KNOWN (type)
1853 && TYPE_POLYMORPHIC_P (type)
1854 && CLASSTYPE_INTERFACE_ONLY (type)
1855 /* If -fno-rtti was specified, then we cannot be sure
1856 that RTTI information will be emitted with the
1857 virtual table of the class, so we must emit it
1858 wherever it is used. */
1864 if (CLASSTYPE_INTERFACE_KNOWN (type)
1865 && !CLASSTYPE_INTERFACE_ONLY (type))
1872 else if (DECL_TEMPLATE_INSTANTIATION (decl)
1873 || DECL_FRIEND_PSEUDO_TEMPLATE_INSTANTIATION (decl))
1875 /* DECL is an implicit instantiation of a function or static
1877 if (flag_implicit_templates
1878 || (flag_implicit_inline_templates
1879 && TREE_CODE (decl) == FUNCTION_DECL
1880 && DECL_DECLARED_INLINE_P (decl)))
1883 /* If we are not implicitly generating templates, then mark
1884 this entity as undefined in this translation unit. */
1887 else if (DECL_FUNCTION_MEMBER_P (decl))
1889 if (!DECL_DECLARED_INLINE_P (decl))
1891 tree ctype = DECL_CONTEXT (decl);
1892 import_export_class (ctype);
1893 if (CLASSTYPE_INTERFACE_KNOWN (ctype))
1895 DECL_NOT_REALLY_EXTERN (decl)
1896 = ! (CLASSTYPE_INTERFACE_ONLY (ctype)
1897 || (DECL_DECLARED_INLINE_P (decl)
1898 && ! flag_implement_inlines
1899 && !DECL_VINDEX (decl)));
1901 if (!DECL_NOT_REALLY_EXTERN (decl))
1902 DECL_EXTERNAL (decl) = 1;
1904 /* Always make artificials weak. */
1905 if (DECL_ARTIFICIAL (decl) && flag_weak)
1908 maybe_make_one_only (decl);
1919 /* If we are importing DECL into this translation unit, mark is
1920 an undefined here. */
1921 DECL_EXTERNAL (decl) = 1;
1922 DECL_NOT_REALLY_EXTERN (decl) = 0;
1926 /* If we decided to put DECL in COMDAT, mark it accordingly at
1928 comdat_linkage (decl);
1931 DECL_INTERFACE_KNOWN (decl) = 1;
1934 /* Return an expression that performs the destruction of DECL, which
1935 must be a VAR_DECL whose type has a non-trivial destructor, or is
1936 an array whose (innermost) elements have a non-trivial destructor. */
1939 build_cleanup (tree decl)
1942 tree type = TREE_TYPE (decl);
1944 /* This function should only be called for declarations that really
1945 require cleanups. */
1946 gcc_assert (!TYPE_HAS_TRIVIAL_DESTRUCTOR (type));
1948 /* Treat all objects with destructors as used; the destructor may do
1949 something substantive. */
1952 if (TREE_CODE (type) == ARRAY_TYPE)
1956 cxx_mark_addressable (decl);
1957 temp = build1 (ADDR_EXPR, build_pointer_type (type), decl);
1959 temp = build_delete (TREE_TYPE (temp), temp,
1960 sfk_complete_destructor,
1961 LOOKUP_NORMAL|LOOKUP_NONVIRTUAL|LOOKUP_DESTRUCTOR, 0);
1965 /* Returns the initialization guard variable for the variable DECL,
1966 which has static storage duration. */
1969 get_guard (tree decl)
1974 sname = mangle_guard_variable (decl);
1975 guard = IDENTIFIER_GLOBAL_VALUE (sname);
1980 /* We use a type that is big enough to contain a mutex as well
1981 as an integer counter. */
1982 guard_type = targetm.cxx.guard_type ();
1983 guard = build_decl (VAR_DECL, sname, guard_type);
1985 /* The guard should have the same linkage as what it guards. */
1986 TREE_PUBLIC (guard) = TREE_PUBLIC (decl);
1987 TREE_STATIC (guard) = TREE_STATIC (decl);
1988 DECL_COMMON (guard) = DECL_COMMON (decl);
1989 DECL_ONE_ONLY (guard) = DECL_ONE_ONLY (decl);
1990 if (TREE_PUBLIC (decl))
1991 DECL_WEAK (guard) = DECL_WEAK (decl);
1993 DECL_ARTIFICIAL (guard) = 1;
1994 TREE_USED (guard) = 1;
1995 pushdecl_top_level_and_finish (guard, NULL_TREE);
2000 /* Return those bits of the GUARD variable that should be set when the
2001 guarded entity is actually initialized. */
2004 get_guard_bits (tree guard)
2006 if (!targetm.cxx.guard_mask_bit ())
2008 /* We only set the first byte of the guard, in order to leave room
2009 for a mutex in the high-order bits. */
2010 guard = build1 (ADDR_EXPR,
2011 build_pointer_type (TREE_TYPE (guard)),
2013 guard = build1 (NOP_EXPR,
2014 build_pointer_type (char_type_node),
2016 guard = build1 (INDIRECT_REF, char_type_node, guard);
2022 /* Return an expression which determines whether or not the GUARD
2023 variable has already been initialized. */
2026 get_guard_cond (tree guard)
2030 /* Check to see if the GUARD is zero. */
2031 guard = get_guard_bits (guard);
2033 /* Mask off all but the low bit. */
2034 if (targetm.cxx.guard_mask_bit ())
2036 guard_value = integer_one_node;
2037 if (!same_type_p (TREE_TYPE (guard_value), TREE_TYPE (guard)))
2038 guard_value = convert (TREE_TYPE (guard), guard_value);
2039 guard = cp_build_binary_op (BIT_AND_EXPR, guard, guard_value);
2042 guard_value = integer_zero_node;
2043 if (!same_type_p (TREE_TYPE (guard_value), TREE_TYPE (guard)))
2044 guard_value = convert (TREE_TYPE (guard), guard_value);
2045 return cp_build_binary_op (EQ_EXPR, guard, guard_value);
2048 /* Return an expression which sets the GUARD variable, indicating that
2049 the variable being guarded has been initialized. */
2052 set_guard (tree guard)
2056 /* Set the GUARD to one. */
2057 guard = get_guard_bits (guard);
2058 guard_init = integer_one_node;
2059 if (!same_type_p (TREE_TYPE (guard_init), TREE_TYPE (guard)))
2060 guard_init = convert (TREE_TYPE (guard), guard_init);
2061 return build_modify_expr (guard, NOP_EXPR, guard_init);
2064 /* Start the process of running a particular set of global constructors
2065 or destructors. Subroutine of do_[cd]tors. */
2068 start_objects (int method_type, int initp)
2074 /* Make ctor or dtor function. METHOD_TYPE may be 'I' or 'D'. */
2076 if (initp != DEFAULT_INIT_PRIORITY)
2086 sprintf (type, "%c%c%.5u", method_type, joiner, initp);
2089 sprintf (type, "%c", method_type);
2091 fndecl = build_lang_decl (FUNCTION_DECL,
2092 get_file_function_name_long (type),
2093 build_function_type (void_type_node,
2095 start_preparsed_function (fndecl, /*attrs=*/NULL_TREE, SF_PRE_PARSED);
2097 /* It can be a static function as long as collect2 does not have
2098 to scan the object file to find its ctor/dtor routine. */
2099 TREE_PUBLIC (current_function_decl) = ! targetm.have_ctors_dtors;
2101 /* Mark this declaration as used to avoid spurious warnings. */
2102 TREE_USED (current_function_decl) = 1;
2104 /* Mark this function as a global constructor or destructor. */
2105 if (method_type == 'I')
2106 DECL_GLOBAL_CTOR_P (current_function_decl) = 1;
2108 DECL_GLOBAL_DTOR_P (current_function_decl) = 1;
2109 DECL_LANG_SPECIFIC (current_function_decl)->decl_flags.u2sel = 1;
2111 body = begin_compound_stmt (BCS_FN_BODY);
2113 /* We cannot allow these functions to be elided, even if they do not
2114 have external linkage. And, there's no point in deferring
2115 compilation of thes functions; they're all going to have to be
2117 DECL_INLINE (current_function_decl) = 0;
2118 DECL_UNINLINABLE (current_function_decl) = 1;
2123 /* Finish the process of running a particular set of global constructors
2124 or destructors. Subroutine of do_[cd]tors. */
2127 finish_objects (int method_type, int initp, tree body)
2132 finish_compound_stmt (body);
2133 fn = finish_function (0);
2134 expand_or_defer_fn (fn);
2136 /* When only doing semantic analysis, and no RTL generation, we
2137 can't call functions that directly emit assembly code; there is
2138 no assembly file in which to put the code. */
2139 if (flag_syntax_only)
2142 if (targetm.have_ctors_dtors)
2144 rtx fnsym = XEXP (DECL_RTL (fn), 0);
2145 if (method_type == 'I')
2146 (* targetm.asm_out.constructor) (fnsym, initp);
2148 (* targetm.asm_out.destructor) (fnsym, initp);
2152 /* The names of the parameters to the function created to handle
2153 initializations and destructions for objects with static storage
2155 #define INITIALIZE_P_IDENTIFIER "__initialize_p"
2156 #define PRIORITY_IDENTIFIER "__priority"
2158 /* The name of the function we create to handle initializations and
2159 destructions for objects with static storage duration. */
2160 #define SSDF_IDENTIFIER "__static_initialization_and_destruction"
2162 /* The declaration for the __INITIALIZE_P argument. */
2163 static GTY(()) tree initialize_p_decl;
2165 /* The declaration for the __PRIORITY argument. */
2166 static GTY(()) tree priority_decl;
2168 /* The declaration for the static storage duration function. */
2169 static GTY(()) tree ssdf_decl;
2171 /* All the static storage duration functions created in this
2172 translation unit. */
2173 static GTY(()) varray_type ssdf_decls;
2175 /* A map from priority levels to information about that priority
2176 level. There may be many such levels, so efficient lookup is
2178 static splay_tree priority_info_map;
2180 /* Begins the generation of the function that will handle all
2181 initialization and destruction of objects with static storage
2182 duration. The function generated takes two parameters of type
2183 `int': __INITIALIZE_P and __PRIORITY. If __INITIALIZE_P is
2184 nonzero, it performs initializations. Otherwise, it performs
2185 destructions. It only performs those initializations or
2186 destructions with the indicated __PRIORITY. The generated function
2189 It is assumed that this function will only be called once per
2190 translation unit. */
2193 start_static_storage_duration_function (unsigned count)
2198 char id[sizeof (SSDF_IDENTIFIER) + 1 /* '\0' */ + 32];
2200 /* Create the identifier for this function. It will be of the form
2201 SSDF_IDENTIFIER_<number>. */
2202 sprintf (id, "%s_%u", SSDF_IDENTIFIER, count);
2204 /* Create the parameters. */
2205 parm_types = void_list_node;
2206 parm_types = tree_cons (NULL_TREE, integer_type_node, parm_types);
2207 parm_types = tree_cons (NULL_TREE, integer_type_node, parm_types);
2208 type = build_function_type (void_type_node, parm_types);
2210 /* Create the FUNCTION_DECL itself. */
2211 ssdf_decl = build_lang_decl (FUNCTION_DECL,
2212 get_identifier (id),
2214 TREE_PUBLIC (ssdf_decl) = 0;
2215 DECL_ARTIFICIAL (ssdf_decl) = 1;
2217 /* Put this function in the list of functions to be called from the
2218 static constructors and destructors. */
2221 VARRAY_TREE_INIT (ssdf_decls, 32, "ssdf_decls");
2223 /* Take this opportunity to initialize the map from priority
2224 numbers to information about that priority level. */
2225 priority_info_map = splay_tree_new (splay_tree_compare_ints,
2226 /*delete_key_fn=*/0,
2227 /*delete_value_fn=*/
2228 (splay_tree_delete_value_fn) &free);
2230 /* We always need to generate functions for the
2231 DEFAULT_INIT_PRIORITY so enter it now. That way when we walk
2232 priorities later, we'll be sure to find the
2233 DEFAULT_INIT_PRIORITY. */
2234 get_priority_info (DEFAULT_INIT_PRIORITY);
2237 VARRAY_PUSH_TREE (ssdf_decls, ssdf_decl);
2239 /* Create the argument list. */
2240 initialize_p_decl = cp_build_parm_decl
2241 (get_identifier (INITIALIZE_P_IDENTIFIER), integer_type_node);
2242 DECL_CONTEXT (initialize_p_decl) = ssdf_decl;
2243 TREE_USED (initialize_p_decl) = 1;
2244 priority_decl = cp_build_parm_decl
2245 (get_identifier (PRIORITY_IDENTIFIER), integer_type_node);
2246 DECL_CONTEXT (priority_decl) = ssdf_decl;
2247 TREE_USED (priority_decl) = 1;
2249 TREE_CHAIN (initialize_p_decl) = priority_decl;
2250 DECL_ARGUMENTS (ssdf_decl) = initialize_p_decl;
2252 /* Put the function in the global scope. */
2253 pushdecl (ssdf_decl);
2255 /* Start the function itself. This is equivalent to declaring the
2258 static void __ssdf (int __initialize_p, init __priority_p);
2260 It is static because we only need to call this function from the
2261 various constructor and destructor functions for this module. */
2262 start_preparsed_function (ssdf_decl,
2263 /*attrs=*/NULL_TREE,
2266 /* Set up the scope of the outermost block in the function. */
2267 body = begin_compound_stmt (BCS_FN_BODY);
2269 /* This function must not be deferred because we are depending on
2270 its compilation to tell us what is TREE_SYMBOL_REFERENCED. */
2271 DECL_INLINE (ssdf_decl) = 0;
2272 DECL_UNINLINABLE (ssdf_decl) = 1;
2277 /* Finish the generation of the function which performs initialization
2278 and destruction of objects with static storage duration. After
2279 this point, no more such objects can be created. */
2282 finish_static_storage_duration_function (tree body)
2284 /* Close out the function. */
2285 finish_compound_stmt (body);
2286 expand_or_defer_fn (finish_function (0));
2289 /* Return the information about the indicated PRIORITY level. If no
2290 code to handle this level has yet been generated, generate the
2291 appropriate prologue. */
2293 static priority_info
2294 get_priority_info (int priority)
2299 n = splay_tree_lookup (priority_info_map,
2300 (splay_tree_key) priority);
2303 /* Create a new priority information structure, and insert it
2305 pi = xmalloc (sizeof (struct priority_info_s));
2306 pi->initializations_p = 0;
2307 pi->destructions_p = 0;
2308 splay_tree_insert (priority_info_map,
2309 (splay_tree_key) priority,
2310 (splay_tree_value) pi);
2313 pi = (priority_info) n->value;
2318 /* Set up to handle the initialization or destruction of DECL. If
2319 INITP is nonzero, we are initializing the variable. Otherwise, we
2320 are destroying it. */
2323 start_static_initialization_or_destruction (tree decl, int initp)
2325 tree guard_if_stmt = NULL_TREE;
2332 /* Figure out the priority for this declaration. */
2333 priority = DECL_INIT_PRIORITY (decl);
2335 priority = DEFAULT_INIT_PRIORITY;
2337 /* Remember that we had an initialization or finalization at this
2339 pi = get_priority_info (priority);
2341 pi->initializations_p = 1;
2343 pi->destructions_p = 1;
2345 /* Trick the compiler into thinking we are at the file and line
2346 where DECL was declared so that error-messages make sense, and so
2347 that the debugger will show somewhat sensible file and line
2349 input_location = DECL_SOURCE_LOCATION (decl);
2355 Access control for implicit calls to the constructors,
2356 the conversion functions, or the destructor called to
2357 create and destroy a static data member is performed as
2358 if these calls appeared in the scope of the member's
2361 we pretend we are in a static member function of the class of
2362 which the DECL is a member. */
2363 if (member_p (decl))
2365 DECL_CONTEXT (current_function_decl) = DECL_CONTEXT (decl);
2366 DECL_STATIC_FUNCTION_P (current_function_decl) = 1;
2369 /* Conditionalize this initialization on being in the right priority
2370 and being initializing/finalizing appropriately. */
2371 guard_if_stmt = begin_if_stmt ();
2372 cond = cp_build_binary_op (EQ_EXPR,
2374 build_int_cst (NULL_TREE, priority));
2375 init_cond = initp ? integer_one_node : integer_zero_node;
2376 init_cond = cp_build_binary_op (EQ_EXPR,
2379 cond = cp_build_binary_op (TRUTH_ANDIF_EXPR, cond, init_cond);
2381 /* Assume we don't need a guard. */
2383 /* We need a guard if this is an object with external linkage that
2384 might be initialized in more than one place. (For example, a
2385 static data member of a template, when the data member requires
2387 if (TREE_PUBLIC (decl) && (DECL_COMMON (decl)
2388 || DECL_ONE_ONLY (decl)
2389 || DECL_WEAK (decl)))
2393 guard = get_guard (decl);
2395 /* When using __cxa_atexit, we just check the GUARD as we would
2396 for a local static. */
2397 if (flag_use_cxa_atexit)
2399 /* When using __cxa_atexit, we never try to destroy
2400 anything from a static destructor. */
2402 guard_cond = get_guard_cond (guard);
2404 /* If we don't have __cxa_atexit, then we will be running
2405 destructors from .fini sections, or their equivalents. So,
2406 we need to know how many times we've tried to initialize this
2407 object. We do initializations only if the GUARD is zero,
2408 i.e., if we are the first to initialize the variable. We do
2409 destructions only if the GUARD is one, i.e., if we are the
2410 last to destroy the variable. */
2413 = cp_build_binary_op (EQ_EXPR,
2414 build_unary_op (PREINCREMENT_EXPR,
2420 = cp_build_binary_op (EQ_EXPR,
2421 build_unary_op (PREDECREMENT_EXPR,
2426 cond = cp_build_binary_op (TRUTH_ANDIF_EXPR, cond, guard_cond);
2429 finish_if_stmt_cond (cond, guard_if_stmt);
2431 /* If we're using __cxa_atexit, we have not already set the GUARD,
2432 so we must do so now. */
2433 if (guard && initp && flag_use_cxa_atexit)
2434 finish_expr_stmt (set_guard (guard));
2436 return guard_if_stmt;
2439 /* We've just finished generating code to do an initialization or
2440 finalization. GUARD_IF_STMT is the if-statement we used to guard
2441 the initialization. */
2444 finish_static_initialization_or_destruction (tree guard_if_stmt)
2446 finish_then_clause (guard_if_stmt);
2447 finish_if_stmt (guard_if_stmt);
2449 /* Now that we're done with DECL we don't need to pretend to be a
2450 member of its class any longer. */
2451 DECL_CONTEXT (current_function_decl) = NULL_TREE;
2452 DECL_STATIC_FUNCTION_P (current_function_decl) = 0;
2455 /* Generate code to do the initialization of DECL, a VAR_DECL with
2456 static storage duration. The initialization is INIT. */
2459 do_static_initialization (tree decl, tree init)
2463 /* Set up for the initialization. */
2465 = start_static_initialization_or_destruction (decl,
2468 /* Perform the initialization. */
2470 finish_expr_stmt (init);
2472 /* If we're using __cxa_atexit, register a a function that calls the
2473 destructor for the object. */
2474 if (flag_use_cxa_atexit)
2475 finish_expr_stmt (register_dtor_fn (decl));
2478 finish_static_initialization_or_destruction (guard_if_stmt);
2481 /* Generate code to do the static destruction of DECL. If DECL may be
2482 initialized more than once in different object files, GUARD is the
2483 guard variable to check. PRIORITY is the priority for the
2487 do_static_destruction (tree decl)
2491 /* If we're using __cxa_atexit, then destructors are registered
2492 immediately after objects are initialized. */
2493 gcc_assert (!flag_use_cxa_atexit);
2495 /* If we don't need a destructor, there's nothing to do. */
2496 if (TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
2499 /* Actually do the destruction. */
2500 guard_if_stmt = start_static_initialization_or_destruction (decl,
2502 finish_expr_stmt (build_cleanup (decl));
2503 finish_static_initialization_or_destruction (guard_if_stmt);
2506 /* VARS is a list of variables with static storage duration which may
2507 need initialization and/or finalization. Remove those variables
2508 that don't really need to be initialized or finalized, and return
2509 the resulting list. The order in which the variables appear in
2510 VARS is in reverse order of the order in which they should actually
2511 be initialized. The list we return is in the unreversed order;
2512 i.e., the first variable should be initialized first. */
2515 prune_vars_needing_no_initialization (tree *vars)
2518 tree result = NULL_TREE;
2523 tree decl = TREE_VALUE (t);
2524 tree init = TREE_PURPOSE (t);
2526 /* Deal gracefully with error. */
2527 if (decl == error_mark_node)
2529 var = &TREE_CHAIN (t);
2533 /* The only things that can be initialized are variables. */
2534 gcc_assert (TREE_CODE (decl) == VAR_DECL);
2536 /* If this object is not defined, we don't need to do anything
2538 if (DECL_EXTERNAL (decl))
2540 var = &TREE_CHAIN (t);
2544 /* Also, if the initializer already contains errors, we can bail
2546 if (init && TREE_CODE (init) == TREE_LIST
2547 && value_member (error_mark_node, init))
2549 var = &TREE_CHAIN (t);
2553 /* This variable is going to need initialization and/or
2554 finalization, so we add it to the list. */
2555 *var = TREE_CHAIN (t);
2556 TREE_CHAIN (t) = result;
2563 /* Make sure we have told the back end about all the variables in
2567 write_out_vars (tree vars)
2571 for (v = vars; v; v = TREE_CHAIN (v))
2573 tree var = TREE_VALUE (v);
2574 if (!var_finalized_p (var))
2576 import_export_decl (var);
2577 rest_of_decl_compilation (var, 1, 1);
2582 /* Generate a static constructor (if CONSTRUCTOR_P) or destructor
2583 (otherwise) that will initialize all gobal objects with static
2584 storage duration having the indicated PRIORITY. */
2587 generate_ctor_or_dtor_function (bool constructor_p, int priority,
2596 input_location = *locus;
2597 #ifdef USE_MAPPED_LOCATION
2603 /* We use `I' to indicate initialization and `D' to indicate
2605 function_key = constructor_p ? 'I' : 'D';
2607 /* We emit the function lazily, to avoid generating empty
2608 global constructors and destructors. */
2611 /* Call the static storage duration function with appropriate
2614 for (i = 0; i < ssdf_decls->elements_used; ++i)
2616 fndecl = VARRAY_TREE (ssdf_decls, i);
2618 /* Calls to pure or const functions will expand to nothing. */
2619 if (! (flags_from_decl_or_type (fndecl) & (ECF_CONST | ECF_PURE)))
2622 body = start_objects (function_key, priority);
2624 arguments = tree_cons (NULL_TREE,
2625 build_int_cst (NULL_TREE, priority),
2627 arguments = tree_cons (NULL_TREE,
2628 build_int_cst (NULL_TREE, constructor_p),
2630 finish_expr_stmt (build_function_call (fndecl, arguments));
2634 /* If we're generating code for the DEFAULT_INIT_PRIORITY, throw in
2635 calls to any functions marked with attributes indicating that
2636 they should be called at initialization- or destruction-time. */
2637 if (priority == DEFAULT_INIT_PRIORITY)
2641 for (fns = constructor_p ? static_ctors : static_dtors;
2643 fns = TREE_CHAIN (fns))
2645 fndecl = TREE_VALUE (fns);
2647 /* Calls to pure/const functions will expand to nothing. */
2648 if (! (flags_from_decl_or_type (fndecl) & (ECF_CONST | ECF_PURE)))
2651 body = start_objects (function_key, priority);
2652 finish_expr_stmt (build_function_call (fndecl, NULL_TREE));
2657 /* Close out the function. */
2659 finish_objects (function_key, priority, body);
2662 /* Generate constructor and destructor functions for the priority
2666 generate_ctor_and_dtor_functions_for_priority (splay_tree_node n, void * data)
2668 location_t *locus = data;
2669 int priority = (int) n->key;
2670 priority_info pi = (priority_info) n->value;
2672 /* Generate the functions themselves, but only if they are really
2674 if (pi->initializations_p
2675 || (priority == DEFAULT_INIT_PRIORITY && static_ctors))
2676 generate_ctor_or_dtor_function (/*constructor_p=*/true, priority, locus);
2677 if (pi->destructions_p
2678 || (priority == DEFAULT_INIT_PRIORITY && static_dtors))
2679 generate_ctor_or_dtor_function (/*constructor_p=*/false, priority, locus);
2681 /* Keep iterating. */
2685 /* Called via LANGHOOK_CALLGRAPH_ANALYZE_EXPR. It is supposed to mark
2686 decls referenced from frontend specific constructs; it will be called
2687 only for language-specific tree nodes.
2689 Here we must deal with member pointers. */
2692 cxx_callgraph_analyze_expr (tree *tp, int *walk_subtrees ATTRIBUTE_UNUSED,
2693 tree from ATTRIBUTE_UNUSED)
2697 switch (TREE_CODE (t))
2700 if (TYPE_PTRMEMFUNC_P (TREE_TYPE (t)))
2701 cgraph_mark_needed_node (cgraph_node (PTRMEM_CST_MEMBER (t)));
2704 if (TREE_CODE (BASELINK_FUNCTIONS (t)) == FUNCTION_DECL)
2705 cgraph_mark_needed_node (cgraph_node (BASELINK_FUNCTIONS (t)));
2708 if (DECL_VTABLE_OR_VTT_P (t))
2710 /* The ABI requires that all virtual tables be emitted
2711 whenever one of them is. */
2713 for (vtbl = CLASSTYPE_VTABLES (DECL_CONTEXT (t));
2715 vtbl = TREE_CHAIN (vtbl))
2716 mark_decl_referenced (vtbl);
2718 else if (DECL_CONTEXT (t)
2719 && TREE_CODE (DECL_CONTEXT (t)) == FUNCTION_DECL)
2720 /* If we need a static variable in a function, then we
2721 need the containing function. */
2722 mark_decl_referenced (DECL_CONTEXT (t));
2731 /* This routine is called from the last rule in yyparse ().
2732 Its job is to create all the code needed to initialize and
2733 destroy the global aggregates. We do the destruction
2734 first, since that way we only need to reverse the decls once. */
2737 cp_finish_file (void)
2743 unsigned ssdf_count = 0;
2746 locus = input_location;
2749 /* Bad parse errors. Just forget about it. */
2750 if (! global_bindings_p () || current_class_type || decl_namespace_list)
2754 c_common_write_pch ();
2756 #ifdef USE_MAPPED_LOCATION
2759 /* Otherwise, GDB can get confused, because in only knows
2760 about source for LINENO-1 lines. */
2764 /* We now have to write out all the stuff we put off writing out.
2767 o Template specializations that we have not yet instantiated,
2768 but which are needed.
2769 o Initialization and destruction for non-local objects with
2770 static storage duration. (Local objects with static storage
2771 duration are initialized when their scope is first entered,
2772 and are cleaned up via atexit.)
2773 o Virtual function tables.
2775 All of these may cause others to be needed. For example,
2776 instantiating one function may cause another to be needed, and
2777 generating the initializer for an object may cause templates to be
2778 instantiated, etc., etc. */
2780 timevar_push (TV_VARCONST);
2782 emit_support_tinfos ();
2790 /* If there are templates that we've put off instantiating, do
2792 instantiate_pending_templates (retries);
2795 /* Write out virtual tables as required. Note that writing out
2796 the virtual table for a template class may cause the
2797 instantiation of members of that class. If we write out
2798 vtables then we remove the class from our list so we don't
2799 have to look at it again. */
2801 while (keyed_classes != NULL_TREE
2802 && maybe_emit_vtables (TREE_VALUE (keyed_classes)))
2805 keyed_classes = TREE_CHAIN (keyed_classes);
2811 tree next = TREE_CHAIN (t);
2815 if (maybe_emit_vtables (TREE_VALUE (next)))
2818 TREE_CHAIN (t) = TREE_CHAIN (next);
2823 next = TREE_CHAIN (t);
2827 /* Write out needed type info variables. We have to be careful
2828 looping through unemitted decls, because emit_tinfo_decl may
2829 cause other variables to be needed. New elements will be
2830 appended, and we remove from the vector those that actually
2832 for (i = VEC_length (tree, unemitted_tinfo_decls);
2833 VEC_iterate (tree, unemitted_tinfo_decls, --i, t);)
2834 if (emit_tinfo_decl (t))
2837 VEC_unordered_remove (tree, unemitted_tinfo_decls, i);
2840 /* The list of objects with static storage duration is built up
2841 in reverse order. We clear STATIC_AGGREGATES so that any new
2842 aggregates added during the initialization of these will be
2843 initialized in the correct order when we next come around the
2845 vars = prune_vars_needing_no_initialization (&static_aggregates);
2851 /* We need to start a new initialization function each time
2852 through the loop. That's because we need to know which
2853 vtables have been referenced, and TREE_SYMBOL_REFERENCED
2854 isn't computed until a function is finished, and written
2855 out. That's a deficiency in the back-end. When this is
2856 fixed, these initialization functions could all become
2857 inline, with resulting performance improvements. */
2860 /* Set the line and file, so that it is obviously not from
2862 input_location = locus;
2863 ssdf_body = start_static_storage_duration_function (ssdf_count);
2865 /* Make sure the back end knows about all the variables. */
2866 write_out_vars (vars);
2868 /* First generate code to do all the initializations. */
2869 for (v = vars; v; v = TREE_CHAIN (v))
2870 do_static_initialization (TREE_VALUE (v),
2873 /* Then, generate code to do all the destructions. Do these
2874 in reverse order so that the most recently constructed
2875 variable is the first destroyed. If we're using
2876 __cxa_atexit, then we don't need to do this; functions
2877 were registered at initialization time to destroy the
2879 if (!flag_use_cxa_atexit)
2881 vars = nreverse (vars);
2882 for (v = vars; v; v = TREE_CHAIN (v))
2883 do_static_destruction (TREE_VALUE (v));
2888 /* Finish up the static storage duration function for this
2890 input_location = locus;
2891 finish_static_storage_duration_function (ssdf_body);
2893 /* All those initializations and finalizations might cause
2894 us to need more inline functions, more template
2895 instantiations, etc. */
2898 #ifdef USE_MAPPED_LOCATION
2905 /* Go through the set of inline functions whose bodies have not
2906 been emitted yet. If out-of-line copies of these functions
2907 are required, emit them. */
2908 for (i = 0; i < deferred_fns_used; ++i)
2910 tree decl = VARRAY_TREE (deferred_fns, i);
2912 /* Does it need synthesizing? */
2913 if (DECL_ARTIFICIAL (decl) && ! DECL_INITIAL (decl)
2914 && (! DECL_REALLY_EXTERN (decl) || DECL_INLINE (decl)))
2916 /* Even though we're already at the top-level, we push
2917 there again. That way, when we pop back a few lines
2918 hence, all of our state is restored. Otherwise,
2919 finish_function doesn't clean things up, and we end
2920 up with CURRENT_FUNCTION_DECL set. */
2921 push_to_top_level ();
2922 synthesize_method (decl);
2923 pop_from_top_level ();
2927 if (!DECL_SAVED_TREE (decl))
2930 import_export_decl (decl);
2932 /* We lie to the back-end, pretending that some functions
2933 are not defined when they really are. This keeps these
2934 functions from being put out unnecessarily. But, we must
2935 stop lying when the functions are referenced, or if they
2936 are not comdat since they need to be put out now. This
2937 is done in a separate for cycle, because if some deferred
2938 function is contained in another deferred function later
2939 in deferred_fns varray, rest_of_compilation would skip
2940 this function and we really cannot expand the same
2942 if (DECL_NOT_REALLY_EXTERN (decl)
2943 && DECL_INITIAL (decl)
2944 && decl_needed_p (decl))
2945 DECL_EXTERNAL (decl) = 0;
2947 /* If we're going to need to write this function out, and
2948 there's already a body for it, create RTL for it now.
2949 (There might be no body if this is a method we haven't
2950 gotten around to synthesizing yet.) */
2951 if (!DECL_EXTERNAL (decl)
2952 && decl_needed_p (decl)
2953 && !TREE_ASM_WRITTEN (decl)
2954 && !cgraph_node (decl)->local.finalized)
2956 /* We will output the function; no longer consider it in this
2958 DECL_DEFER_OUTPUT (decl) = 0;
2959 /* Generate RTL for this function now that we know we
2961 expand_or_defer_fn (decl);
2962 /* If we're compiling -fsyntax-only pretend that this
2963 function has been written out so that we don't try to
2965 if (flag_syntax_only)
2966 TREE_ASM_WRITTEN (decl) = 1;
2971 if (walk_namespaces (wrapup_globals_for_namespace, /*data=*/0))
2974 /* Static data members are just like namespace-scope globals. */
2975 for (i = 0; i < pending_statics_used; ++i)
2977 tree decl = VARRAY_TREE (pending_statics, i);
2978 if (var_finalized_p (decl) || DECL_REALLY_EXTERN (decl))
2980 import_export_decl (decl);
2981 /* If this static data member is needed, provide it to the
2983 if (DECL_NOT_REALLY_EXTERN (decl) && decl_needed_p (decl))
2984 DECL_EXTERNAL (decl) = 0;
2987 && wrapup_global_declarations (&VARRAY_TREE (pending_statics, 0),
2988 pending_statics_used))
2991 /* Ask the back end to emit functions and variables that are
2992 enqueued. These emissions may result in marking more entities
2994 if (cgraph_assemble_pending_functions ())
2996 if (cgraph_varpool_assemble_pending_decls ())
3003 /* All used inline functions must have a definition at this point. */
3004 for (i = 0; i < deferred_fns_used; ++i)
3006 tree decl = VARRAY_TREE (deferred_fns, i);
3008 if (/* Check online inline functions that were actually used. */
3009 TREE_USED (decl) && DECL_DECLARED_INLINE_P (decl)
3010 /* But not defined. */
3011 && DECL_REALLY_EXTERN (decl)
3012 /* If we decided to emit this function in another
3013 translation unit, the fact that the definition was
3014 missing here likely indicates only that the repository
3015 decided to place the function elsewhere. With -Winline,
3016 we will still warn if we could not inline the
3018 && !flag_use_repository
3019 /* An explicit instantiation can be used to specify
3020 that the body is in another unit. It will have
3021 already verified there was a definition. */
3022 && !DECL_EXPLICIT_INSTANTIATION (decl))
3024 cp_warning_at ("inline function `%D' used but never defined", decl);
3025 /* This symbol is effectively an "extern" declaration now.
3026 This is not strictly necessary, but removes a duplicate
3028 TREE_PUBLIC (decl) = 1;
3032 /* We give C linkage to static constructors and destructors. */
3033 push_lang_context (lang_name_c);
3035 /* Generate initialization and destruction functions for all
3036 priorities for which they are required. */
3037 if (priority_info_map)
3038 splay_tree_foreach (priority_info_map,
3039 generate_ctor_and_dtor_functions_for_priority,
3045 generate_ctor_or_dtor_function (/*constructor_p=*/true,
3046 DEFAULT_INIT_PRIORITY, &locus);
3048 generate_ctor_or_dtor_function (/*constructor_p=*/false,
3049 DEFAULT_INIT_PRIORITY, &locus);
3052 /* We're done with the splay-tree now. */
3053 if (priority_info_map)
3054 splay_tree_delete (priority_info_map);
3056 /* We're done with static constructors, so we can go back to "C++"
3058 pop_lang_context ();
3060 cgraph_finalize_compilation_unit ();
3063 /* Emit mudflap static registration function. This must be done
3064 after all the user functions have been expanded. */
3066 mudflap_finish_file ();
3068 /* Now, issue warnings about static, but not defined, functions,
3069 etc., and emit debugging information. */
3070 walk_namespaces (wrapup_globals_for_namespace, /*data=*/&reconsider);
3071 if (pending_statics)
3072 check_global_declarations (&VARRAY_TREE (pending_statics, 0),
3073 pending_statics_used);
3077 /* The entire file is now complete. If requested, dump everything
3081 FILE *stream = dump_begin (TDI_tu, &flags);
3085 dump_node (global_namespace, flags & ~TDF_SLIM, stream);
3086 dump_end (TDI_tu, stream);
3090 timevar_pop (TV_VARCONST);
3092 if (flag_detailed_statistics)
3094 dump_tree_statistics ();
3095 dump_time_statistics ();
3097 input_location = locus;
3099 #ifdef ENABLE_CHECKING
3100 validate_conversion_obstack ();
3101 #endif /* ENABLE_CHECKING */
3104 /* FN is an OFFSET_REF, DOTSTAR_EXPR or MEMBER_REF indicating the
3105 function to call in parse-tree form; it has not yet been
3106 semantically analyzed. ARGS are the arguments to the function.
3107 They have already been semantically analyzed. */
3110 build_offset_ref_call_from_tree (tree fn, tree args)
3119 object = TREE_OPERAND (fn, 0);
3121 if (processing_template_decl)
3123 gcc_assert (TREE_CODE (fn) == DOTSTAR_EXPR
3124 || TREE_CODE (fn) == MEMBER_REF);
3125 if (type_dependent_expression_p (fn)
3126 || any_type_dependent_arguments_p (args))
3127 return build_min_nt (CALL_EXPR, fn, args, NULL_TREE);
3129 /* Transform the arguments and add the implicit "this"
3130 parameter. That must be done before the FN is transformed
3131 because we depend on the form of FN. */
3132 args = build_non_dependent_args (args);
3133 if (TREE_CODE (fn) == DOTSTAR_EXPR)
3134 object = build_unary_op (ADDR_EXPR, object, 0);
3135 object = build_non_dependent_expr (object);
3136 args = tree_cons (NULL_TREE, object, args);
3137 /* Now that the arguments are done, transform FN. */
3138 fn = build_non_dependent_expr (fn);
3141 /* A qualified name corresponding to a bound pointer-to-member is
3142 represented as an OFFSET_REF:
3144 struct B { void g(); };
3146 void B::g() { (this->*p)(); } */
3147 if (TREE_CODE (fn) == OFFSET_REF)
3149 tree object_addr = build_unary_op (ADDR_EXPR, object, 0);
3150 fn = TREE_OPERAND (fn, 1);
3151 fn = get_member_function_from_ptrfunc (&object_addr, fn);
3152 args = tree_cons (NULL_TREE, object_addr, args);
3155 expr = build_function_call (fn, args);
3156 if (processing_template_decl && expr != error_mark_node)
3157 return build_min_non_dep (CALL_EXPR, expr, orig_fn, orig_args, NULL_TREE);
3163 check_default_args (tree x)
3165 tree arg = TYPE_ARG_TYPES (TREE_TYPE (x));
3166 bool saw_def = false;
3167 int i = 0 - (TREE_CODE (TREE_TYPE (x)) == METHOD_TYPE);
3168 for (; arg && arg != void_list_node; arg = TREE_CHAIN (arg), ++i)
3170 if (TREE_PURPOSE (arg))
3174 cp_error_at ("default argument missing for parameter %P of %q+#D",
3182 mark_used (tree decl)
3184 TREE_USED (decl) = 1;
3185 if (processing_template_decl || skip_evaluation)
3188 if (TREE_CODE (decl) == FUNCTION_DECL && DECL_DECLARED_INLINE_P (decl)
3189 && !TREE_ASM_WRITTEN (decl))
3190 /* Remember it, so we can check it was defined. */
3192 if (DECL_DEFERRED_FN (decl))
3194 note_vague_linkage_fn (decl);
3197 assemble_external (decl);
3199 /* Is it a synthesized method that needs to be synthesized? */
3200 if (TREE_CODE (decl) == FUNCTION_DECL
3201 && DECL_NONSTATIC_MEMBER_FUNCTION_P (decl)
3202 && DECL_ARTIFICIAL (decl)
3203 && !DECL_THUNK_P (decl)
3204 && ! DECL_INITIAL (decl)
3205 /* Kludge: don't synthesize for default args. */
3206 && current_function_decl)
3208 synthesize_method (decl);
3209 /* If we've already synthesized the method we don't need to
3210 instantiate it, so we can return right away. */
3214 /* If this is a function or variable that is an instance of some
3215 template, we now know that we will need to actually do the
3216 instantiation. We check that DECL is not an explicit
3217 instantiation because that is not checked in instantiate_decl. */
3218 if ((DECL_NON_THUNK_FUNCTION_P (decl) || TREE_CODE (decl) == VAR_DECL)
3219 && DECL_LANG_SPECIFIC (decl) && DECL_TEMPLATE_INFO (decl)
3220 && (!DECL_EXPLICIT_INSTANTIATION (decl)
3221 || (TREE_CODE (decl) == FUNCTION_DECL
3222 && DECL_INLINE (DECL_TEMPLATE_RESULT
3223 (template_for_substitution (decl))))))
3224 /* We put off instantiating functions in order to improve compile
3225 times. Maintaining a stack of active functions is expensive,
3226 and the inliner knows to instantiate any functions it might
3228 instantiate_decl (decl, /*defer_ok=*/true, /*undefined_ok=*/0);
3231 #include "gt-cp-decl2.h"