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"
53 extern cpp_reader *parse_in;
55 /* This structure contains information about the initializations
56 and/or destructions required for a particular priority level. */
57 typedef struct priority_info_s {
58 /* Nonzero if there have been any initializations at this priority
59 throughout the translation unit. */
60 int initializations_p;
61 /* Nonzero if there have been any destructions at this priority
62 throughout the translation unit. */
66 static void mark_vtable_entries (tree);
67 static void grok_function_init (tree, tree);
68 static bool maybe_emit_vtables (tree);
69 static tree build_anon_union_vars (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 (tree, tree);
77 static void do_static_destruction (tree);
78 static tree start_static_initialization_or_destruction (tree, int);
79 static void finish_static_initialization_or_destruction (tree);
80 static void generate_ctor_or_dtor_function (bool, int, location_t *);
81 static int generate_ctor_and_dtor_functions_for_priority (splay_tree_node,
83 static tree prune_vars_needing_no_initialization (tree *);
84 static void write_out_vars (tree);
85 static void import_export_class (tree);
86 static tree get_guard_bits (tree);
88 /* A list of static class variables. This is needed, because a
89 static class variable can be declared inside the class without
90 an initializer, and then initialized, statically, outside the class. */
91 static GTY(()) varray_type pending_statics;
92 #define pending_statics_used \
93 (pending_statics ? pending_statics->elements_used : 0)
95 /* A list of functions which were declared inline, but which we
96 may need to emit outline anyway. */
97 static GTY(()) varray_type deferred_fns;
98 #define deferred_fns_used \
99 (deferred_fns ? deferred_fns->elements_used : 0)
101 /* Flag used when debugging spew.c */
103 extern int spew_debug;
105 /* Nonzero if we're done parsing and into end-of-file activities. */
109 /* Functions called along with real static constructors and destructors. */
115 /* Incorporate `const' and `volatile' qualifiers for member functions.
116 FUNCTION is a TYPE_DECL or a FUNCTION_DECL.
117 QUALS is a list of qualifiers. Returns any explicit
118 top-level qualifiers of the method's this pointer, anything other than
119 TYPE_UNQUALIFIED will be an extension. */
122 grok_method_quals (tree ctype, tree function, cp_cv_quals quals)
124 tree fntype = TREE_TYPE (function);
125 tree raises = TYPE_RAISES_EXCEPTIONS (fntype);
126 int type_quals = TYPE_UNQUALIFIED;
127 int this_quals = TYPE_UNQUALIFIED;
129 type_quals = quals & ~TYPE_QUAL_RESTRICT;
130 this_quals = quals & TYPE_QUAL_RESTRICT;
132 ctype = cp_build_qualified_type (ctype, type_quals);
133 fntype = build_method_type_directly (ctype, TREE_TYPE (fntype),
134 (TREE_CODE (fntype) == METHOD_TYPE
135 ? TREE_CHAIN (TYPE_ARG_TYPES (fntype))
136 : TYPE_ARG_TYPES (fntype)));
138 fntype = build_exception_variant (fntype, raises);
140 TREE_TYPE (function) = fntype;
144 /* Build a PARM_DECL with NAME and TYPE, and set DECL_ARG_TYPE
148 cp_build_parm_decl (tree name, tree type)
150 tree parm = build_decl (PARM_DECL, name, type);
151 /* DECL_ARG_TYPE is only used by the back end and the back end never
153 if (!processing_template_decl)
154 DECL_ARG_TYPE (parm) = type_passed_as (type);
158 /* Returns a PARM_DECL for a parameter of the indicated TYPE, with the
162 build_artificial_parm (tree name, tree type)
164 tree parm = cp_build_parm_decl (name, type);
165 DECL_ARTIFICIAL (parm) = 1;
166 /* All our artificial parms are implicitly `const'; they cannot be
168 TREE_READONLY (parm) = 1;
172 /* Constructors for types with virtual baseclasses need an "in-charge" flag
173 saying whether this constructor is responsible for initialization of
174 virtual baseclasses or not. All destructors also need this "in-charge"
175 flag, which additionally determines whether or not the destructor should
176 free the memory for the object.
178 This function adds the "in-charge" flag to member function FN if
179 appropriate. It is called from grokclassfn and tsubst.
180 FN must be either a constructor or destructor.
182 The in-charge flag follows the 'this' parameter, and is followed by the
183 VTT parm (if any), then the user-written parms. */
186 maybe_retrofit_in_chrg (tree fn)
188 tree basetype, arg_types, parms, parm, fntype;
190 /* If we've already add the in-charge parameter don't do it again. */
191 if (DECL_HAS_IN_CHARGE_PARM_P (fn))
194 /* When processing templates we can't know, in general, whether or
195 not we're going to have virtual baseclasses. */
196 if (processing_template_decl)
199 /* We don't need an in-charge parameter for constructors that don't
200 have virtual bases. */
201 if (DECL_CONSTRUCTOR_P (fn)
202 && !CLASSTYPE_VBASECLASSES (DECL_CONTEXT (fn)))
205 arg_types = TYPE_ARG_TYPES (TREE_TYPE (fn));
206 basetype = TREE_TYPE (TREE_VALUE (arg_types));
207 arg_types = TREE_CHAIN (arg_types);
209 parms = TREE_CHAIN (DECL_ARGUMENTS (fn));
211 /* If this is a subobject constructor or destructor, our caller will
212 pass us a pointer to our VTT. */
213 if (CLASSTYPE_VBASECLASSES (DECL_CONTEXT (fn)))
215 parm = build_artificial_parm (vtt_parm_identifier, vtt_parm_type);
217 /* First add it to DECL_ARGUMENTS between 'this' and the real args... */
218 TREE_CHAIN (parm) = parms;
221 /* ...and then to TYPE_ARG_TYPES. */
222 arg_types = hash_tree_chain (vtt_parm_type, arg_types);
224 DECL_HAS_VTT_PARM_P (fn) = 1;
227 /* Then add the in-charge parm (before the VTT parm). */
228 parm = build_artificial_parm (in_charge_identifier, integer_type_node);
229 TREE_CHAIN (parm) = parms;
231 arg_types = hash_tree_chain (integer_type_node, arg_types);
233 /* Insert our new parameter(s) into the list. */
234 TREE_CHAIN (DECL_ARGUMENTS (fn)) = parms;
236 /* And rebuild the function type. */
237 fntype = build_method_type_directly (basetype, TREE_TYPE (TREE_TYPE (fn)),
239 if (TYPE_RAISES_EXCEPTIONS (TREE_TYPE (fn)))
240 fntype = build_exception_variant (fntype,
241 TYPE_RAISES_EXCEPTIONS (TREE_TYPE (fn)));
242 TREE_TYPE (fn) = fntype;
244 /* Now we've got the in-charge parameter. */
245 DECL_HAS_IN_CHARGE_PARM_P (fn) = 1;
248 /* Classes overload their constituent function names automatically.
249 When a function name is declared in a record structure,
250 its name is changed to it overloaded name. Since names for
251 constructors and destructors can conflict, we place a leading
254 CNAME is the name of the class we are grokking for.
256 FUNCTION is a FUNCTION_DECL. It was created by `grokdeclarator'.
258 FLAGS contains bits saying what's special about today's
259 arguments. 1 == DESTRUCTOR. 2 == OPERATOR.
261 If FUNCTION is a destructor, then we must add the `auto-delete' field
262 as a second parameter. There is some hair associated with the fact
263 that we must "declare" this variable in the manner consistent with the
264 way the rest of the arguments were declared.
266 QUALS are the qualifiers for the this pointer. */
269 grokclassfn (tree ctype, tree function, enum overload_flags flags,
272 tree fn_name = DECL_NAME (function);
273 cp_cv_quals this_quals = TYPE_UNQUALIFIED;
275 /* Even within an `extern "C"' block, members get C++ linkage. See
276 [dcl.link] for details. */
277 SET_DECL_LANGUAGE (function, lang_cplusplus);
279 if (fn_name == NULL_TREE)
281 error ("name missing for member function");
282 fn_name = get_identifier ("<anonymous>");
283 DECL_NAME (function) = fn_name;
287 this_quals = grok_method_quals (ctype, function, quals);
289 if (TREE_CODE (TREE_TYPE (function)) == METHOD_TYPE)
291 /* Must add the class instance variable up front. */
292 /* Right now we just make this a pointer. But later
293 we may wish to make it special. */
294 tree type = TREE_VALUE (TYPE_ARG_TYPES (TREE_TYPE (function)));
298 /* The `this' parameter is implicitly `const'; it cannot be
300 this_quals |= TYPE_QUAL_CONST;
301 qual_type = cp_build_qualified_type (type, this_quals);
302 parm = build_artificial_parm (this_identifier, qual_type);
303 c_apply_type_quals_to_decl (this_quals, parm);
304 TREE_CHAIN (parm) = DECL_ARGUMENTS (function);
305 DECL_ARGUMENTS (function) = parm;
308 DECL_CONTEXT (function) = ctype;
310 if (flags == DTOR_FLAG)
311 DECL_DESTRUCTOR_P (function) = 1;
313 if (flags == DTOR_FLAG || DECL_CONSTRUCTOR_P (function))
314 maybe_retrofit_in_chrg (function);
317 /* Create an ARRAY_REF, checking for the user doing things backwards
321 grok_array_decl (tree array_expr, tree index_exp)
325 tree orig_array_expr = array_expr;
326 tree orig_index_exp = index_exp;
328 if (error_operand_p (array_expr) || error_operand_p (index_exp))
329 return error_mark_node;
331 if (processing_template_decl)
333 if (type_dependent_expression_p (array_expr)
334 || type_dependent_expression_p (index_exp))
335 return build_min_nt (ARRAY_REF, array_expr, index_exp,
336 NULL_TREE, NULL_TREE);
337 array_expr = build_non_dependent_expr (array_expr);
338 index_exp = build_non_dependent_expr (index_exp);
341 type = TREE_TYPE (array_expr);
343 type = non_reference (type);
345 /* If they have an `operator[]', use that. */
346 if (IS_AGGR_TYPE (type) || IS_AGGR_TYPE (TREE_TYPE (index_exp)))
347 expr = build_new_op (ARRAY_REF, LOOKUP_NORMAL,
348 array_expr, index_exp, NULL_TREE,
349 /*overloaded_p=*/NULL);
354 /* Otherwise, create an ARRAY_REF for a pointer or array type.
355 It is a little-known fact that, if `a' is an array and `i' is
356 an int, you can write `i[a]', which means the same thing as
358 if (TREE_CODE (type) == ARRAY_TYPE)
361 p1 = build_expr_type_conversion (WANT_POINTER, array_expr, false);
363 if (TREE_CODE (TREE_TYPE (index_exp)) == ARRAY_TYPE)
366 p2 = build_expr_type_conversion (WANT_POINTER, index_exp, false);
368 i1 = build_expr_type_conversion (WANT_INT | WANT_ENUM, array_expr,
370 i2 = build_expr_type_conversion (WANT_INT | WANT_ENUM, index_exp,
373 if ((p1 && i2) && (i1 && p2))
374 error ("ambiguous conversion for array subscript");
377 array_expr = p1, index_exp = i2;
379 array_expr = p2, index_exp = i1;
382 error ("invalid types %<%T[%T]%> for array subscript",
383 type, TREE_TYPE (index_exp));
384 return error_mark_node;
387 if (array_expr == error_mark_node || index_exp == error_mark_node)
388 error ("ambiguous conversion for array subscript");
390 expr = build_array_ref (array_expr, index_exp);
392 if (processing_template_decl && expr != error_mark_node)
393 return build_min_non_dep (ARRAY_REF, expr, orig_array_expr, orig_index_exp,
394 NULL_TREE, NULL_TREE);
398 /* Given the cast expression EXP, checking out its validity. Either return
399 an error_mark_node if there was an unavoidable error, return a cast to
400 void for trying to delete a pointer w/ the value 0, or return the
401 call to delete. If DOING_VEC is true, we handle things differently
402 for doing an array delete.
403 Implements ARM $5.3.4. This is called from the parser. */
406 delete_sanity (tree exp, tree size, bool doing_vec, int use_global_delete)
410 if (exp == error_mark_node)
413 if (processing_template_decl)
415 t = build_min (DELETE_EXPR, void_type_node, exp, size);
416 DELETE_EXPR_USE_GLOBAL (t) = use_global_delete;
417 DELETE_EXPR_USE_VEC (t) = doing_vec;
418 TREE_SIDE_EFFECTS (t) = 1;
422 /* An array can't have been allocated by new, so complain. */
423 if (TREE_CODE (exp) == VAR_DECL
424 && TREE_CODE (TREE_TYPE (exp)) == ARRAY_TYPE)
425 warning ("deleting array %q#D", exp);
427 t = build_expr_type_conversion (WANT_POINTER, exp, true);
429 if (t == NULL_TREE || t == error_mark_node)
431 error ("type %q#T argument given to %<delete%>, expected pointer",
433 return error_mark_node;
436 type = TREE_TYPE (t);
438 /* As of Valley Forge, you can delete a pointer to const. */
440 /* You can't delete functions. */
441 if (TREE_CODE (TREE_TYPE (type)) == FUNCTION_TYPE)
443 error ("cannot delete a function. Only pointer-to-objects are "
444 "valid arguments to %<delete%>");
445 return error_mark_node;
448 /* Deleting ptr to void is undefined behavior [expr.delete/3]. */
449 if (TREE_CODE (TREE_TYPE (type)) == VOID_TYPE)
451 warning ("deleting %qT is undefined", type);
455 /* Deleting a pointer with the value zero is valid and has no effect. */
456 if (integer_zerop (t))
457 return build1 (NOP_EXPR, void_type_node, t);
460 return build_vec_delete (t, /*maxindex=*/NULL_TREE,
461 sfk_deleting_destructor,
464 return build_delete (type, t, sfk_deleting_destructor,
465 LOOKUP_NORMAL, use_global_delete);
468 /* Report an error if the indicated template declaration is not the
469 sort of thing that should be a member template. */
472 check_member_template (tree tmpl)
476 gcc_assert (TREE_CODE (tmpl) == TEMPLATE_DECL);
477 decl = DECL_TEMPLATE_RESULT (tmpl);
479 if (TREE_CODE (decl) == FUNCTION_DECL
480 || (TREE_CODE (decl) == TYPE_DECL
481 && IS_AGGR_TYPE (TREE_TYPE (decl))))
483 if (current_function_decl)
484 /* 14.5.2.2 [temp.mem]
486 A local class shall not have member templates. */
487 error ("invalid declaration of member template %q#D in local class",
490 if (TREE_CODE (decl) == FUNCTION_DECL && DECL_VIRTUAL_P (decl))
492 /* 14.5.2.3 [temp.mem]
494 A member function template shall not be virtual. */
496 ("invalid use of %<virtual%> in template declaration of %q#D",
498 DECL_VIRTUAL_P (decl) = 0;
501 /* The debug-information generating code doesn't know what to do
502 with member templates. */
503 DECL_IGNORED_P (tmpl) = 1;
506 error ("template declaration of %q#D", decl);
509 /* Return true iff TYPE is a valid Java parameter or return type. */
512 acceptable_java_type (tree type)
514 if (TREE_CODE (type) == VOID_TYPE || TYPE_FOR_JAVA (type))
516 if (TREE_CODE (type) == POINTER_TYPE || TREE_CODE (type) == REFERENCE_TYPE)
518 type = TREE_TYPE (type);
519 if (TREE_CODE (type) == RECORD_TYPE)
522 if (! TYPE_FOR_JAVA (type))
524 if (! CLASSTYPE_TEMPLATE_INFO (type))
526 args = CLASSTYPE_TI_ARGS (type);
527 i = TREE_VEC_LENGTH (args);
530 type = TREE_VEC_ELT (args, i);
531 if (TREE_CODE (type) == POINTER_TYPE)
532 type = TREE_TYPE (type);
533 if (! TYPE_FOR_JAVA (type))
542 /* For a METHOD in a Java class CTYPE, return true if
543 the parameter and return types are valid Java types.
544 Otherwise, print appropriate error messages, and return false. */
547 check_java_method (tree method)
550 tree arg_types = TYPE_ARG_TYPES (TREE_TYPE (method));
551 tree ret_type = TREE_TYPE (TREE_TYPE (method));
553 if (!acceptable_java_type (ret_type))
555 error ("Java method %qD has non-Java return type %qT",
560 arg_types = TREE_CHAIN (arg_types);
561 if (DECL_HAS_IN_CHARGE_PARM_P (method))
562 arg_types = TREE_CHAIN (arg_types);
563 if (DECL_HAS_VTT_PARM_P (method))
564 arg_types = TREE_CHAIN (arg_types);
566 for (; arg_types != NULL_TREE; arg_types = TREE_CHAIN (arg_types))
568 tree type = TREE_VALUE (arg_types);
569 if (!acceptable_java_type (type))
571 error ("Java method %qD has non-Java parameter type %qT",
579 /* Sanity check: report error if this function FUNCTION is not
580 really a member of the class (CTYPE) it is supposed to belong to.
581 TEMPLATE_PARMS is used to specify the template parameters of a member
582 template passed as FUNCTION_DECL. If the member template is passed as a
583 TEMPLATE_DECL, it can be NULL since the parameters can be extracted
584 from the declaration. If the function is not a function template, it
586 It returns the original declaration for the function, or NULL_TREE
587 if no declaration was found (and an error was emitted). */
590 check_classfn (tree ctype, tree function, tree template_parms)
595 if (DECL_USE_TEMPLATE (function)
596 && !(TREE_CODE (function) == TEMPLATE_DECL
597 && DECL_TEMPLATE_SPECIALIZATION (function))
598 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (function)))
599 /* Since this is a specialization of a member template,
600 we're not going to find the declaration in the class.
603 struct S { template <typename T> void f(T); };
604 template <> void S::f(int);
606 we're not going to find `S::f(int)', but there's no
607 reason we should, either. We let our callers know we didn't
608 find the method, but we don't complain. */
611 /* Basic sanity check: for a template function, the template parameters
612 either were not passed, or they are the same of DECL_TEMPLATE_PARMS. */
613 if (TREE_CODE (function) == TEMPLATE_DECL)
615 gcc_assert (!template_parms
616 || comp_template_parms (template_parms,
617 DECL_TEMPLATE_PARMS (function)));
618 template_parms = DECL_TEMPLATE_PARMS (function);
621 /* OK, is this a definition of a member template? */
622 is_template = (template_parms != NULL_TREE);
624 ix = class_method_index_for_fn (complete_type (ctype), function);
627 VEC(tree) *methods = CLASSTYPE_METHOD_VEC (ctype);
628 tree fndecls, fndecl = 0;
631 const char *format = NULL;
633 pop_p = push_scope (ctype);
634 for (fndecls = VEC_index (tree, methods, ix);
635 fndecls; fndecls = OVL_NEXT (fndecls))
639 fndecl = OVL_CURRENT (fndecls);
640 p1 = TYPE_ARG_TYPES (TREE_TYPE (function));
641 p2 = TYPE_ARG_TYPES (TREE_TYPE (fndecl));
643 /* We cannot simply call decls_match because this doesn't
644 work for static member functions that are pretending to
645 be methods, and because the name may have been changed by
648 /* Get rid of the this parameter on functions that become
650 if (DECL_STATIC_FUNCTION_P (fndecl)
651 && TREE_CODE (TREE_TYPE (function)) == METHOD_TYPE)
652 p1 = TREE_CHAIN (p1);
654 /* A member template definition only matches a member template
656 if (is_template != (TREE_CODE (fndecl) == TEMPLATE_DECL))
659 if (same_type_p (TREE_TYPE (TREE_TYPE (function)),
660 TREE_TYPE (TREE_TYPE (fndecl)))
661 && compparms (p1, p2)
663 || comp_template_parms (template_parms,
664 DECL_TEMPLATE_PARMS (fndecl)))
665 && (DECL_TEMPLATE_SPECIALIZATION (function)
666 == DECL_TEMPLATE_SPECIALIZATION (fndecl))
667 && (!DECL_TEMPLATE_SPECIALIZATION (function)
668 || (DECL_TI_TEMPLATE (function)
669 == DECL_TI_TEMPLATE (fndecl))))
675 return OVL_CURRENT (fndecls);
676 error ("prototype for %q#D does not match any in class %qT",
678 is_conv_op = DECL_CONV_FN_P (fndecl);
681 ix = CLASSTYPE_FIRST_CONVERSION_SLOT;
682 fndecls = VEC_index (tree, methods, ix);
685 fndecl = OVL_CURRENT (fndecls);
686 fndecls = OVL_NEXT (fndecls);
688 if (!fndecls && is_conv_op)
690 if (VEC_length (tree, methods) > (size_t) ++ix)
692 fndecls = VEC_index (tree, methods, ix);
693 if (!DECL_CONV_FN_P (OVL_CURRENT (fndecls)))
705 format = "candidates are: %#D";
707 format = "candidate is: %#D";
708 cp_error_at (format, fndecl);
711 else if (!COMPLETE_TYPE_P (ctype))
712 cxx_incomplete_type_error (function, ctype);
714 error ("no %q#D member function declared in class %qT",
717 /* If we did not find the method in the class, add it to avoid
718 spurious errors (unless the CTYPE is not yet defined, in which
719 case we'll only confuse ourselves when the function is declared
720 properly within the class. */
721 if (COMPLETE_TYPE_P (ctype))
722 add_method (ctype, function);
726 /* DECL is a function with vague linkage. Remember it so that at the
727 end of the translation unit we can decide whether or not to emit
731 note_vague_linkage_fn (tree decl)
733 if (!DECL_DEFERRED_FN (decl))
735 DECL_DEFERRED_FN (decl) = 1;
736 DECL_DEFER_OUTPUT (decl) = 1;
738 VARRAY_TREE_INIT (deferred_fns, 32, "deferred_fns");
739 VARRAY_PUSH_TREE (deferred_fns, decl);
743 /* Like note_vague_linkage_fn but for variables. */
746 note_vague_linkage_var (tree var)
748 if (!pending_statics)
749 VARRAY_TREE_INIT (pending_statics, 32, "pending_statics");
750 VARRAY_PUSH_TREE (pending_statics, var);
753 /* We have just processed the DECL, which is a static data member.
754 Its initializer, if present, is INIT. The ASMSPEC_TREE, if
755 present, is the assembly-language name for the data member.
756 FLAGS is as for cp_finish_decl. */
759 finish_static_data_member_decl (tree decl, tree init, tree asmspec_tree,
762 gcc_assert (TREE_PUBLIC (decl));
764 DECL_CONTEXT (decl) = current_class_type;
766 /* We cannot call pushdecl here, because that would fill in the
767 TREE_CHAIN of our decl. Instead, we modify cp_finish_decl to do
768 the right thing, namely, to put this decl out straight away. */
769 /* current_class_type can be NULL_TREE in case of error. */
770 if (!asmspec_tree && current_class_type)
771 DECL_INITIAL (decl) = error_mark_node;
773 if (! processing_template_decl)
774 note_vague_linkage_var (decl);
776 if (LOCAL_CLASS_P (current_class_type))
777 pedwarn ("local class %q#T shall not have static data member %q#D",
778 current_class_type, decl);
780 /* Static consts need not be initialized in the class definition. */
781 if (init != NULL_TREE && TYPE_NEEDS_CONSTRUCTING (TREE_TYPE (decl)))
783 static int explained = 0;
785 error ("initializer invalid for static member with constructor");
788 error ("(an out of class initialization is required)");
793 /* Force the compiler to know when an uninitialized static const
794 member is being used. */
795 if (CP_TYPE_CONST_P (TREE_TYPE (decl)) && init == 0)
796 TREE_USED (decl) = 1;
797 DECL_INITIAL (decl) = init;
798 DECL_IN_AGGR_P (decl) = 1;
800 cp_finish_decl (decl, init, asmspec_tree, flags);
803 /* Process the specs, declarator (NULL if omitted) and width (NULL if omitted)
804 of a structure component, returning a _DECL node.
805 QUALS is a list of type qualifiers for this decl (such as for declaring
806 const member functions).
808 This is done during the parsing of the struct declaration.
809 The _DECL nodes are chained together and the lot of them
810 are ultimately passed to `build_struct' to make the RECORD_TYPE node.
812 If class A defines that certain functions in class B are friends, then
813 the way I have set things up, it is B who is interested in permission
814 granted by A. However, it is in A's context that these declarations
815 are parsed. By returning a void_type_node, class A does not attempt
816 to incorporate the declarations of the friends within its structure.
818 DO NOT MAKE ANY CHANGES TO THIS CODE WITHOUT MAKING CORRESPONDING
819 CHANGES TO CODE IN `start_method'. */
822 grokfield (const cp_declarator *declarator,
823 cp_decl_specifier_seq *declspecs,
824 tree init, tree asmspec_tree,
828 const char *asmspec = 0;
829 int flags = LOOKUP_ONLYCONVERTING;
831 if (!declspecs->any_specifiers_p
832 && declarator->kind == cdk_id
833 && TREE_CODE (declarator->u.id.name) == SCOPE_REF
834 && (TREE_CODE (TREE_OPERAND (declarator->u.id.name, 1))
836 /* Access declaration */
837 return do_class_using_decl (declarator->u.id.name);
840 && TREE_CODE (init) == TREE_LIST
841 && TREE_VALUE (init) == error_mark_node
842 && TREE_CHAIN (init) == NULL_TREE)
845 value = grokdeclarator (declarator, declspecs, FIELD, init != 0, &attrlist);
846 if (! value || error_operand_p (value))
847 /* friend or constructor went bad. */
848 return error_mark_node;
850 if (TREE_CODE (value) == TYPE_DECL && init)
852 error ("typedef %qD is initialized (use __typeof__ instead)", value);
856 /* Pass friendly classes back. */
857 if (value == void_type_node)
860 /* Pass friend decls back. */
861 if ((TREE_CODE (value) == FUNCTION_DECL
862 || TREE_CODE (value) == TEMPLATE_DECL)
863 && DECL_CONTEXT (value) != current_class_type)
866 if (DECL_NAME (value) != NULL_TREE
867 && IDENTIFIER_POINTER (DECL_NAME (value))[0] == '_'
868 && ! strcmp (IDENTIFIER_POINTER (DECL_NAME (value)), "_vptr"))
869 error ("member %qD conflicts with virtual function table field name",
872 /* Stash away type declarations. */
873 if (TREE_CODE (value) == TYPE_DECL)
875 DECL_NONLOCAL (value) = 1;
876 DECL_CONTEXT (value) = current_class_type;
878 if (processing_template_decl)
879 value = push_template_decl (value);
882 cplus_decl_attributes (&value, attrlist, 0);
887 if (DECL_IN_AGGR_P (value))
889 error ("%qD is already defined in %qT", value, DECL_CONTEXT (value));
890 return void_type_node;
894 asmspec = TREE_STRING_POINTER (asmspec_tree);
898 if (TREE_CODE (value) == FUNCTION_DECL)
900 grok_function_init (value, init);
903 else if (pedantic && TREE_CODE (value) != VAR_DECL)
904 /* Already complained in grokdeclarator. */
908 /* We allow initializers to become parameters to base
910 if (TREE_CODE (init) == TREE_LIST)
912 if (TREE_CHAIN (init) == NULL_TREE)
913 init = TREE_VALUE (init);
915 init = digest_init (TREE_TYPE (value), init, (tree *)0);
918 if (!processing_template_decl)
920 if (TREE_CODE (init) == CONST_DECL)
921 init = DECL_INITIAL (init);
922 else if (TREE_READONLY_DECL_P (init))
923 init = decl_constant_value (init);
924 else if (TREE_CODE (init) == CONSTRUCTOR)
925 init = digest_init (TREE_TYPE (value), init, (tree *)0);
926 if (init != error_mark_node && ! TREE_CONSTANT (init))
928 /* We can allow references to things that are effectively
929 static, since references are initialized with the
931 if (TREE_CODE (TREE_TYPE (value)) != REFERENCE_TYPE
932 || (TREE_STATIC (init) == 0
933 && (!DECL_P (init) || DECL_EXTERNAL (init) == 0)))
935 error ("field initializer is not constant");
936 init = error_mark_node;
943 if (processing_template_decl
944 && (TREE_CODE (value) == VAR_DECL || TREE_CODE (value) == FUNCTION_DECL))
946 value = push_template_decl (value);
947 if (error_operand_p (value))
948 return error_mark_node;
952 cplus_decl_attributes (&value, attrlist, 0);
954 switch (TREE_CODE (value))
957 finish_static_data_member_decl (value, init, asmspec_tree,
963 error ("%<asm%> specifiers are not permitted on non-static data members");
964 if (DECL_INITIAL (value) == error_mark_node)
965 init = error_mark_node;
966 cp_finish_decl (value, init, NULL_TREE, flags);
967 DECL_INITIAL (value) = init;
968 DECL_IN_AGGR_P (value) = 1;
973 set_user_assembler_name (value, asmspec);
974 if (!DECL_FRIEND_P (value))
975 grok_special_member_properties (value);
977 cp_finish_decl (value, init, asmspec_tree, flags);
979 /* Pass friends back this way. */
980 if (DECL_FRIEND_P (value))
981 return void_type_node;
983 DECL_IN_AGGR_P (value) = 1;
992 /* Like `grokfield', but for bitfields.
993 WIDTH is non-NULL for bit fields only, and is an INTEGER_CST node. */
996 grokbitfield (const cp_declarator *declarator,
997 cp_decl_specifier_seq *declspecs, tree width)
999 tree value = grokdeclarator (declarator, declspecs, BITFIELD, 0, NULL);
1001 if (! value) return NULL_TREE; /* friends went bad. */
1003 /* Pass friendly classes back. */
1004 if (TREE_CODE (value) == VOID_TYPE)
1005 return void_type_node;
1007 if (TREE_CODE (value) == TYPE_DECL)
1009 error ("cannot declare %qD to be a bit-field type", value);
1013 /* Usually, finish_struct_1 catches bitfields with invalid types.
1014 But, in the case of bitfields with function type, we confuse
1015 ourselves into thinking they are member functions, so we must
1017 if (TREE_CODE (value) == FUNCTION_DECL)
1019 error ("cannot declare bit-field %qD with function type",
1024 if (DECL_IN_AGGR_P (value))
1026 error ("%qD is already defined in the class %qT", value,
1027 DECL_CONTEXT (value));
1028 return void_type_node;
1031 if (TREE_STATIC (value))
1033 error ("static member %qD cannot be a bit-field", value);
1036 cp_finish_decl (value, NULL_TREE, NULL_TREE, 0);
1038 if (width != error_mark_node)
1040 constant_expression_warning (width);
1041 DECL_INITIAL (value) = width;
1042 SET_DECL_C_BIT_FIELD (value);
1045 DECL_IN_AGGR_P (value) = 1;
1049 /* When a function is declared with an initializer,
1050 do the right thing. Currently, there are two possibilities:
1055 // initialization possibility #1.
1056 virtual void f () = 0;
1078 // initialization possibility #2
1085 grok_function_init (tree decl, tree init)
1087 /* An initializer for a function tells how this function should
1089 tree type = TREE_TYPE (decl);
1091 if (TREE_CODE (type) == FUNCTION_TYPE)
1092 error ("initializer specified for non-member function %qD", decl);
1093 else if (integer_zerop (init))
1094 DECL_PURE_VIRTUAL_P (decl) = 1;
1096 error ("invalid initializer for virtual method %qD", decl);
1100 cplus_decl_attributes (tree *decl, tree attributes, int flags)
1102 if (*decl == NULL_TREE || *decl == void_type_node)
1105 if (TREE_CODE (*decl) == TEMPLATE_DECL)
1106 decl = &DECL_TEMPLATE_RESULT (*decl);
1108 decl_attributes (decl, attributes, flags);
1110 if (TREE_CODE (*decl) == TYPE_DECL)
1111 SET_IDENTIFIER_TYPE_VALUE (DECL_NAME (*decl), TREE_TYPE (*decl));
1114 /* Walks through the namespace- or function-scope anonymous union OBJECT,
1115 building appropriate ALIAS_DECLs. Returns one of the fields for use in
1116 the mangled name. */
1119 build_anon_union_vars (tree object)
1121 tree type = TREE_TYPE (object);
1122 tree main_decl = NULL_TREE;
1125 /* Rather than write the code to handle the non-union case,
1126 just give an error. */
1127 if (TREE_CODE (type) != UNION_TYPE)
1128 error ("anonymous struct not inside named type");
1130 for (field = TYPE_FIELDS (type);
1132 field = TREE_CHAIN (field))
1137 if (DECL_ARTIFICIAL (field))
1139 if (TREE_CODE (field) != FIELD_DECL)
1141 cp_pedwarn_at ("%q#D invalid; an anonymous union can only "
1142 "have non-static data members",
1147 if (TREE_PRIVATE (field))
1148 cp_pedwarn_at ("private member %q#D in anonymous union", field);
1149 else if (TREE_PROTECTED (field))
1150 cp_pedwarn_at ("protected member %q#D in anonymous union", field);
1152 if (processing_template_decl)
1153 ref = build_min_nt (COMPONENT_REF, object,
1154 DECL_NAME (field), NULL_TREE);
1156 ref = build_class_member_access_expr (object, field, NULL_TREE,
1159 if (DECL_NAME (field))
1161 decl = build_decl (ALIAS_DECL, DECL_NAME (field), TREE_TYPE (field));
1162 DECL_INITIAL (decl) = ref;
1163 TREE_PUBLIC (decl) = 0;
1164 TREE_STATIC (decl) = 0;
1165 DECL_EXTERNAL (decl) = 1;
1166 decl = pushdecl (decl);
1168 else if (ANON_AGGR_TYPE_P (TREE_TYPE (field)))
1169 decl = build_anon_union_vars (ref);
1173 if (main_decl == NULL_TREE)
1180 /* Finish off the processing of a UNION_TYPE structure. If the union is an
1181 anonymous union, then all members must be laid out together. PUBLIC_P
1182 is nonzero if this union is not declared static. */
1185 finish_anon_union (tree anon_union_decl)
1191 if (anon_union_decl == error_mark_node)
1194 type = TREE_TYPE (anon_union_decl);
1195 public_p = TREE_PUBLIC (anon_union_decl);
1197 /* The VAR_DECL's context is the same as the TYPE's context. */
1198 DECL_CONTEXT (anon_union_decl) = DECL_CONTEXT (TYPE_NAME (type));
1200 if (TYPE_FIELDS (type) == NULL_TREE)
1205 error ("namespace-scope anonymous aggregates must be static");
1209 main_decl = build_anon_union_vars (anon_union_decl);
1210 if (main_decl == NULL_TREE)
1212 warning ("anonymous union with no members");
1216 if (!processing_template_decl)
1218 /* Use main_decl to set the mangled name. */
1219 DECL_NAME (anon_union_decl) = DECL_NAME (main_decl);
1220 mangle_decl (anon_union_decl);
1221 DECL_NAME (anon_union_decl) = NULL_TREE;
1224 pushdecl (anon_union_decl);
1225 if (building_stmt_tree ()
1226 && at_function_scope_p ())
1227 add_decl_expr (anon_union_decl);
1228 else if (!processing_template_decl)
1229 rest_of_decl_compilation (anon_union_decl,
1230 toplevel_bindings_p (), at_eof);
1233 /* Auxiliary functions to make type signatures for
1234 `operator new' and `operator delete' correspond to
1235 what compiler will be expecting. */
1238 coerce_new_type (tree type)
1241 tree args = TYPE_ARG_TYPES (type);
1243 gcc_assert (TREE_CODE (type) == FUNCTION_TYPE);
1245 if (!same_type_p (TREE_TYPE (type), ptr_type_node))
1248 error ("%<operator new%> must return type %qT", ptr_type_node);
1251 if (!args || args == void_list_node
1252 || !same_type_p (TREE_VALUE (args), size_type_node))
1255 if (args && args != void_list_node)
1256 args = TREE_CHAIN (args);
1257 pedwarn ("%<operator new%> takes type %<size_t%> (%qT) "
1258 "as first parameter", size_type_node);
1263 args = tree_cons (NULL_TREE, size_type_node, args);
1266 type = build_exception_variant
1267 (build_function_type (ptr_type_node, args),
1268 TYPE_RAISES_EXCEPTIONS (type));
1276 coerce_delete_type (tree type)
1279 tree args = TYPE_ARG_TYPES (type);
1281 gcc_assert (TREE_CODE (type) == FUNCTION_TYPE);
1283 if (!same_type_p (TREE_TYPE (type), void_type_node))
1286 error ("%<operator delete%> must return type %qT", void_type_node);
1289 if (!args || args == void_list_node
1290 || !same_type_p (TREE_VALUE (args), ptr_type_node))
1293 if (args && args != void_list_node)
1294 args = TREE_CHAIN (args);
1295 error ("%<operator delete%> takes type %qT as first parameter",
1301 args = tree_cons (NULL_TREE, ptr_type_node, args);
1304 type = build_exception_variant
1305 (build_function_type (void_type_node, args),
1306 TYPE_RAISES_EXCEPTIONS (type));
1315 mark_vtable_entries (tree decl)
1317 tree entries = CONSTRUCTOR_ELTS (DECL_INITIAL (decl));
1319 for (; entries; entries = TREE_CHAIN (entries))
1321 tree fnaddr = TREE_VALUE (entries);
1324 STRIP_NOPS (fnaddr);
1326 if (TREE_CODE (fnaddr) != ADDR_EXPR
1327 && TREE_CODE (fnaddr) != FDESC_EXPR)
1328 /* This entry is an offset: a virtual base class offset, a
1329 virtual call offset, an RTTI offset, etc. */
1332 fn = TREE_OPERAND (fnaddr, 0);
1333 TREE_ADDRESSABLE (fn) = 1;
1334 /* When we don't have vcall offsets, we output thunks whenever
1335 we output the vtables that contain them. With vcall offsets,
1336 we know all the thunks we'll need when we emit a virtual
1337 function, so we emit the thunks there instead. */
1338 if (DECL_THUNK_P (fn))
1339 use_thunk (fn, /*emit_p=*/0);
1344 /* Set DECL up to have the closest approximation of "initialized common"
1345 linkage available. */
1348 comdat_linkage (tree decl)
1351 make_decl_one_only (decl);
1352 else if (TREE_CODE (decl) == FUNCTION_DECL
1353 || (TREE_CODE (decl) == VAR_DECL && DECL_ARTIFICIAL (decl)))
1354 /* We can just emit function and compiler-generated variables
1355 statically; having multiple copies is (for the most part) only
1358 There are two correctness issues, however: the address of a
1359 template instantiation with external linkage should be the
1360 same, independent of what translation unit asks for the
1361 address, and this will not hold when we emit multiple copies of
1362 the function. However, there's little else we can do.
1364 Also, by default, the typeinfo implementation assumes that
1365 there will be only one copy of the string used as the name for
1366 each type. Therefore, if weak symbols are unavailable, the
1367 run-time library should perform a more conservative check; it
1368 should perform a string comparison, rather than an address
1370 TREE_PUBLIC (decl) = 0;
1373 /* Static data member template instantiations, however, cannot
1374 have multiple copies. */
1375 if (DECL_INITIAL (decl) == 0
1376 || DECL_INITIAL (decl) == error_mark_node)
1377 DECL_COMMON (decl) = 1;
1378 else if (EMPTY_CONSTRUCTOR_P (DECL_INITIAL (decl)))
1380 DECL_COMMON (decl) = 1;
1381 DECL_INITIAL (decl) = error_mark_node;
1383 else if (!DECL_EXPLICIT_INSTANTIATION (decl))
1385 /* We can't do anything useful; leave vars for explicit
1387 DECL_EXTERNAL (decl) = 1;
1388 DECL_NOT_REALLY_EXTERN (decl) = 0;
1392 if (DECL_LANG_SPECIFIC (decl))
1393 DECL_COMDAT (decl) = 1;
1396 /* For win32 we also want to put explicit instantiations in
1397 linkonce sections, so that they will be merged with implicit
1398 instantiations; otherwise we get duplicate symbol errors.
1399 For Darwin we do not want explicit instantiations to be
1403 maybe_make_one_only (tree decl)
1405 /* We used to say that this was not necessary on targets that support weak
1406 symbols, because the implicit instantiations will defer to the explicit
1407 one. However, that's not actually the case in SVR4; a strong definition
1408 after a weak one is an error. Also, not making explicit
1409 instantiations one_only means that we can end up with two copies of
1410 some template instantiations. */
1414 /* We can't set DECL_COMDAT on functions, or cp_finish_file will think
1415 we can get away with not emitting them if they aren't used. We need
1416 to for variables so that cp_finish_decl will update their linkage,
1417 because their DECL_INITIAL may not have been set properly yet. */
1419 if (!TARGET_WEAK_NOT_IN_ARCHIVE_TOC
1420 || (! DECL_EXPLICIT_INSTANTIATION (decl)
1421 && ! DECL_TEMPLATE_SPECIALIZATION (decl)))
1423 make_decl_one_only (decl);
1425 if (TREE_CODE (decl) == VAR_DECL)
1427 DECL_COMDAT (decl) = 1;
1428 /* Mark it needed so we don't forget to emit it. */
1429 mark_decl_referenced (decl);
1434 /* Determine whether or not we want to specifically import or export CTYPE,
1435 using various heuristics. */
1438 import_export_class (tree ctype)
1440 /* -1 for imported, 1 for exported. */
1441 int import_export = 0;
1443 /* It only makes sense to call this function at EOF. The reason is
1444 that this function looks at whether or not the first non-inline
1445 non-abstract virtual member function has been defined in this
1446 translation unit. But, we can't possibly know that until we've
1447 seen the entire translation unit. */
1448 gcc_assert (at_eof);
1450 if (CLASSTYPE_INTERFACE_KNOWN (ctype))
1453 /* If MULTIPLE_SYMBOL_SPACES is set and we saw a #pragma interface,
1454 we will have CLASSTYPE_INTERFACE_ONLY set but not
1455 CLASSTYPE_INTERFACE_KNOWN. In that case, we don't want to use this
1456 heuristic because someone will supply a #pragma implementation
1457 elsewhere, and deducing it here would produce a conflict. */
1458 if (CLASSTYPE_INTERFACE_ONLY (ctype))
1461 if (lookup_attribute ("dllimport", TYPE_ATTRIBUTES (ctype)))
1463 else if (lookup_attribute ("dllexport", TYPE_ATTRIBUTES (ctype)))
1465 else if (CLASSTYPE_IMPLICIT_INSTANTIATION (ctype)
1466 && !flag_implicit_templates)
1467 /* For a template class, without -fimplicit-templates, check the
1468 repository. If the virtual table is assigned to this
1469 translation unit, then export the class; otherwise, import
1471 import_export = repo_export_class_p (ctype) ? 1 : -1;
1472 else if (TYPE_POLYMORPHIC_P (ctype))
1474 /* The ABI specifies that the virtual table and associated
1475 information are emitted with the key method, if any. */
1476 tree method = CLASSTYPE_KEY_METHOD (ctype);
1477 /* If weak symbol support is not available, then we must be
1478 careful not to emit the vtable when the key function is
1479 inline. An inline function can be defined in multiple
1480 translation units. If we were to emit the vtable in each
1481 translation unit containing a definition, we would get
1482 multiple definition errors at link-time. */
1483 if (method && (flag_weak || ! DECL_DECLARED_INLINE_P (method)))
1484 import_export = (DECL_REALLY_EXTERN (method) ? -1 : 1);
1487 /* When MULTIPLE_SYMBOL_SPACES is set, we cannot count on seeing
1488 a definition anywhere else. */
1489 if (MULTIPLE_SYMBOL_SPACES && import_export == -1)
1492 /* Allow backends the chance to overrule the decision. */
1493 if (targetm.cxx.import_export_class)
1494 import_export = targetm.cxx.import_export_class (ctype, import_export);
1498 SET_CLASSTYPE_INTERFACE_KNOWN (ctype);
1499 CLASSTYPE_INTERFACE_ONLY (ctype) = (import_export < 0);
1503 /* Return true if VAR has already been provided to the back end; in that
1504 case VAR should not be modified further by the front end. */
1506 var_finalized_p (tree var)
1508 return cgraph_varpool_node (var)->finalized;
1511 /* DECL is a VAR_DECL or FUNCTION_DECL which, for whatever reason,
1512 must be emitted in this translation unit. Mark it as such. */
1515 mark_needed (tree decl)
1517 /* It's possible that we no longer need to set
1518 TREE_SYMBOL_REFERENCED here directly, but doing so is
1520 TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)) = 1;
1521 mark_decl_referenced (decl);
1524 /* DECL is either a FUNCTION_DECL or a VAR_DECL. This function
1525 returns true if a definition of this entity should be provided in
1526 this object file. Callers use this function to determine whether
1527 or not to let the back end know that a definition of DECL is
1528 available in this translation unit. */
1531 decl_needed_p (tree decl)
1533 gcc_assert (TREE_CODE (decl) == VAR_DECL
1534 || TREE_CODE (decl) == FUNCTION_DECL);
1535 /* This function should only be called at the end of the translation
1536 unit. We cannot be sure of whether or not something will be
1537 COMDAT until that point. */
1538 gcc_assert (at_eof);
1540 /* All entities with external linkage that are not COMDAT should be
1541 emitted; they may be referred to from other object files. */
1542 if (TREE_PUBLIC (decl) && !DECL_COMDAT (decl))
1544 /* If this entity was used, let the back-end see it; it will decide
1545 whether or not to emit it into the object file. */
1546 if (TREE_USED (decl)
1547 || (DECL_ASSEMBLER_NAME_SET_P (decl)
1548 && TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))))
1550 /* Otherwise, DECL does not need to be emitted -- yet. A subsequent
1551 reference to DECL might cause it to be emitted later. */
1555 /* If necessary, write out the vtables for the dynamic class CTYPE.
1556 Returns true if any vtables were emitted. */
1559 maybe_emit_vtables (tree ctype)
1565 /* If the vtables for this class have already been emitted there is
1566 nothing more to do. */
1567 primary_vtbl = CLASSTYPE_VTABLES (ctype);
1568 if (var_finalized_p (primary_vtbl))
1570 /* Ignore dummy vtables made by get_vtable_decl. */
1571 if (TREE_TYPE (primary_vtbl) == void_type_node)
1574 /* On some targets, we cannot determine the key method until the end
1575 of the translation unit -- which is when this function is
1577 if (!targetm.cxx.key_method_may_be_inline ())
1578 determine_key_method (ctype);
1580 /* See if any of the vtables are needed. */
1581 for (vtbl = CLASSTYPE_VTABLES (ctype); vtbl; vtbl = TREE_CHAIN (vtbl))
1583 import_export_decl (vtbl);
1584 if (DECL_NOT_REALLY_EXTERN (vtbl) && decl_needed_p (vtbl))
1589 /* If the references to this class' vtables are optimized away,
1590 still emit the appropriate debugging information. See
1592 if (DECL_COMDAT (primary_vtbl)
1593 && CLASSTYPE_DEBUG_REQUESTED (ctype))
1594 note_debug_info_needed (ctype);
1598 /* The ABI requires that we emit all of the vtables if we emit any
1600 for (vtbl = CLASSTYPE_VTABLES (ctype); vtbl; vtbl = TREE_CHAIN (vtbl))
1602 /* Mark entities references from the virtual table as used. */
1603 mark_vtable_entries (vtbl);
1605 if (TREE_TYPE (DECL_INITIAL (vtbl)) == 0)
1607 tree expr = store_init_value (vtbl, DECL_INITIAL (vtbl));
1609 /* It had better be all done at compile-time. */
1614 DECL_EXTERNAL (vtbl) = 0;
1615 rest_of_decl_compilation (vtbl, 1, 1);
1617 /* Because we're only doing syntax-checking, we'll never end up
1618 actually marking the variable as written. */
1619 if (flag_syntax_only)
1620 TREE_ASM_WRITTEN (vtbl) = 1;
1623 /* Since we're writing out the vtable here, also write the debug
1625 note_debug_info_needed (ctype);
1630 /* Like c_determine_visibility, but with additional C++-specific
1634 determine_visibility (tree decl)
1638 /* Cloned constructors and destructors get the same visibility as
1639 the underlying function. That should be set up in
1640 maybe_clone_body. */
1641 gcc_assert (!DECL_CLONED_FUNCTION_P (decl));
1643 /* Give the common code a chance to make a determination. */
1644 if (c_determine_visibility (decl))
1647 /* If DECL is a member of a class, visibility specifiers on the
1648 class can influence the visibility of the DECL. */
1649 if (DECL_CLASS_SCOPE_P (decl))
1650 class_type = DECL_CONTEXT (decl);
1651 else if (TREE_CODE (decl) == VAR_DECL
1652 && DECL_TINFO_P (decl)
1653 && CLASS_TYPE_P (TREE_TYPE (DECL_NAME (decl))))
1654 class_type = TREE_TYPE (DECL_NAME (decl));
1657 /* Virtual tables have DECL_CONTEXT set to their associated class,
1658 so they are automatically handled above. */
1659 gcc_assert (TREE_CODE (decl) != VAR_DECL
1660 || !DECL_VTABLE_OR_VTT_P (decl));
1661 /* Entities not associated with any class just get the
1662 visibility specified by their attributes. */
1666 /* By default, static data members and function members receive
1667 the visibility of their containing class. */
1670 if (TARGET_DLLIMPORT_DECL_ATTRIBUTES
1671 && lookup_attribute ("dllexport", TYPE_ATTRIBUTES (class_type)))
1673 DECL_VISIBILITY (decl) = VISIBILITY_DEFAULT;
1674 DECL_VISIBILITY_SPECIFIED (decl) = 1;
1676 else if (TREE_CODE (decl) == FUNCTION_DECL
1677 && DECL_DECLARED_INLINE_P (decl)
1678 && visibility_options.inlines_hidden)
1680 DECL_VISIBILITY (decl) = VISIBILITY_HIDDEN;
1681 DECL_VISIBILITY_SPECIFIED (decl) = 1;
1683 else if (CLASSTYPE_VISIBILITY_SPECIFIED (class_type))
1685 DECL_VISIBILITY (decl) = CLASSTYPE_VISIBILITY (class_type);
1686 DECL_VISIBILITY_SPECIFIED (decl) = 1;
1688 /* If no explicit visibility information has been provided for
1689 this class, some targets require that class data be
1691 else if (TREE_CODE (decl) == VAR_DECL
1692 && targetm.cxx.export_class_data ()
1693 && (DECL_TINFO_P (decl)
1694 || (DECL_VTABLE_OR_VTT_P (decl)
1695 /* Construction virtual tables are not emitted
1696 because they cannot be referred to from other
1697 object files; their name is not standardized by
1699 && !DECL_CONSTRUCTION_VTABLE_P (decl))))
1700 DECL_VISIBILITY (decl) = VISIBILITY_DEFAULT;
1703 DECL_VISIBILITY (decl) = CLASSTYPE_VISIBILITY (class_type);
1704 DECL_VISIBILITY_SPECIFIED (decl) = 0;
1709 /* DECL is a FUNCTION_DECL or VAR_DECL. If the object file linkage
1710 for DECL has not already been determined, do so now by setting
1711 DECL_EXTERNAL, DECL_COMDAT and other related flags. Until this
1712 function is called entities with vague linkage whose definitions
1713 are available must have TREE_PUBLIC set.
1715 If this function decides to place DECL in COMDAT, it will set
1716 appropriate flags -- but will not clear DECL_EXTERNAL. It is up to
1717 the caller to decide whether or not to clear DECL_EXTERNAL. Some
1718 callers defer that decision until it is clear that DECL is actually
1722 import_export_decl (tree decl)
1728 if (DECL_INTERFACE_KNOWN (decl))
1731 /* We cannot determine what linkage to give to an entity with vague
1732 linkage until the end of the file. For example, a virtual table
1733 for a class will be defined if and only if the key method is
1734 defined in this translation unit. As a further example, consider
1735 that when compiling a translation unit that uses PCH file with
1736 "-frepo" it would be incorrect to make decisions about what
1737 entities to emit when building the PCH; those decisions must be
1738 delayed until the repository information has been processed. */
1739 gcc_assert (at_eof);
1740 /* Object file linkage for explicit instantiations is handled in
1741 mark_decl_instantiated. For static variables in functions with
1742 vague linkage, maybe_commonize_var is used.
1744 Therefore, the only declarations that should be provided to this
1745 function are those with external linkage that are:
1747 * implicit instantiations of function templates
1751 * implicit instantiations of static data members of class
1758 Furthermore, all entities that reach this point must have a
1759 definition available in this translation unit.
1761 The following assertions check these conditions. */
1762 gcc_assert (TREE_CODE (decl) == FUNCTION_DECL
1763 || TREE_CODE (decl) == VAR_DECL);
1764 /* Any code that creates entities with TREE_PUBLIC cleared should
1765 also set DECL_INTERFACE_KNOWN. */
1766 gcc_assert (TREE_PUBLIC (decl));
1767 if (TREE_CODE (decl) == FUNCTION_DECL)
1768 gcc_assert (DECL_IMPLICIT_INSTANTIATION (decl)
1769 || DECL_FRIEND_PSEUDO_TEMPLATE_INSTANTIATION (decl)
1770 || DECL_DECLARED_INLINE_P (decl));
1772 gcc_assert (DECL_IMPLICIT_INSTANTIATION (decl)
1773 || DECL_VTABLE_OR_VTT_P (decl)
1774 || DECL_TINFO_P (decl));
1775 /* Check that a definition of DECL is available in this translation
1777 gcc_assert (!DECL_REALLY_EXTERN (decl));
1779 /* Assume that DECL will not have COMDAT linkage. */
1781 /* Assume that DECL will not be imported into this translation
1785 /* See if the repository tells us whether or not to emit DECL in
1786 this translation unit. */
1787 emit_p = repo_emit_p (decl);
1790 else if (emit_p == 1)
1792 /* The repository indicates that this entity should be defined
1793 here. Make sure the back end honors that request. */
1794 if (TREE_CODE (decl) == VAR_DECL)
1796 else if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (decl)
1797 || DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P (decl))
1800 FOR_EACH_CLONE (clone, decl)
1801 mark_needed (clone);
1805 /* Output the definition as an ordinary strong definition. */
1806 DECL_EXTERNAL (decl) = 0;
1807 DECL_INTERFACE_KNOWN (decl) = 1;
1812 /* We have already decided what to do with this DECL; there is no
1813 need to check anything further. */
1815 else if (TREE_CODE (decl) == VAR_DECL && DECL_VTABLE_OR_VTT_P (decl))
1817 tree type = DECL_CONTEXT (decl);
1818 import_export_class (type);
1819 if (TYPE_FOR_JAVA (type))
1821 else if (CLASSTYPE_INTERFACE_KNOWN (type)
1822 && CLASSTYPE_INTERFACE_ONLY (type))
1824 else if (TARGET_WEAK_NOT_IN_ARCHIVE_TOC
1825 && !CLASSTYPE_USE_TEMPLATE (type)
1826 && CLASSTYPE_KEY_METHOD (type)
1827 && !DECL_DECLARED_INLINE_P (CLASSTYPE_KEY_METHOD (type)))
1828 /* The ABI requires that all virtual tables be emitted with
1829 COMDAT linkage. However, on systems where COMDAT symbols
1830 don't show up in the table of contents for a static
1831 archive, the linker will report errors about undefined
1832 symbols because it will not see the virtual table
1833 definition. Therefore, in the case that we know that the
1834 virtual table will be emitted in only one translation
1835 unit, we make the virtual table an ordinary definition
1836 with external linkage. */
1837 DECL_EXTERNAL (decl) = 0;
1838 else if (CLASSTYPE_INTERFACE_KNOWN (type))
1840 /* TYPE is being exported from this translation unit, so DECL
1841 should be defined here. The ABI requires COMDAT
1842 linkage. Normally, we only emit COMDAT things when they
1843 are needed; make sure that we realize that this entity is
1848 else if (!flag_implicit_templates
1849 && CLASSTYPE_IMPLICIT_INSTANTIATION (type))
1854 else if (TREE_CODE (decl) == VAR_DECL && DECL_TINFO_P (decl))
1856 tree type = TREE_TYPE (DECL_NAME (decl));
1857 if (CLASS_TYPE_P (type))
1859 import_export_class (type);
1860 if (CLASSTYPE_INTERFACE_KNOWN (type)
1861 && TYPE_POLYMORPHIC_P (type)
1862 && CLASSTYPE_INTERFACE_ONLY (type)
1863 /* If -fno-rtti was specified, then we cannot be sure
1864 that RTTI information will be emitted with the
1865 virtual table of the class, so we must emit it
1866 wherever it is used. */
1872 if (CLASSTYPE_INTERFACE_KNOWN (type)
1873 && !CLASSTYPE_INTERFACE_ONLY (type))
1880 else if (DECL_TEMPLATE_INSTANTIATION (decl)
1881 || DECL_FRIEND_PSEUDO_TEMPLATE_INSTANTIATION (decl))
1883 /* DECL is an implicit instantiation of a function or static
1885 if (flag_implicit_templates
1886 || (flag_implicit_inline_templates
1887 && TREE_CODE (decl) == FUNCTION_DECL
1888 && DECL_DECLARED_INLINE_P (decl)))
1891 /* If we are not implicitly generating templates, then mark
1892 this entity as undefined in this translation unit. */
1895 else if (DECL_FUNCTION_MEMBER_P (decl))
1897 if (!DECL_DECLARED_INLINE_P (decl))
1899 tree ctype = DECL_CONTEXT (decl);
1900 import_export_class (ctype);
1901 if (CLASSTYPE_INTERFACE_KNOWN (ctype))
1903 DECL_NOT_REALLY_EXTERN (decl)
1904 = ! (CLASSTYPE_INTERFACE_ONLY (ctype)
1905 || (DECL_DECLARED_INLINE_P (decl)
1906 && ! flag_implement_inlines
1907 && !DECL_VINDEX (decl)));
1909 if (!DECL_NOT_REALLY_EXTERN (decl))
1910 DECL_EXTERNAL (decl) = 1;
1912 /* Always make artificials weak. */
1913 if (DECL_ARTIFICIAL (decl) && flag_weak)
1916 maybe_make_one_only (decl);
1927 /* If we are importing DECL into this translation unit, mark is
1928 an undefined here. */
1929 DECL_EXTERNAL (decl) = 1;
1930 DECL_NOT_REALLY_EXTERN (decl) = 0;
1934 /* If we decided to put DECL in COMDAT, mark it accordingly at
1936 comdat_linkage (decl);
1939 DECL_INTERFACE_KNOWN (decl) = 1;
1942 /* Return an expression that performs the destruction of DECL, which
1943 must be a VAR_DECL whose type has a non-trivial destructor, or is
1944 an array whose (innermost) elements have a non-trivial destructor. */
1947 build_cleanup (tree decl)
1950 tree type = TREE_TYPE (decl);
1952 /* This function should only be called for declarations that really
1953 require cleanups. */
1954 gcc_assert (!TYPE_HAS_TRIVIAL_DESTRUCTOR (type));
1956 /* Treat all objects with destructors as used; the destructor may do
1957 something substantive. */
1960 if (TREE_CODE (type) == ARRAY_TYPE)
1964 cxx_mark_addressable (decl);
1965 temp = build1 (ADDR_EXPR, build_pointer_type (type), decl);
1967 temp = build_delete (TREE_TYPE (temp), temp,
1968 sfk_complete_destructor,
1969 LOOKUP_NORMAL|LOOKUP_NONVIRTUAL|LOOKUP_DESTRUCTOR, 0);
1973 /* Returns the initialization guard variable for the variable DECL,
1974 which has static storage duration. */
1977 get_guard (tree decl)
1982 sname = mangle_guard_variable (decl);
1983 guard = IDENTIFIER_GLOBAL_VALUE (sname);
1988 /* We use a type that is big enough to contain a mutex as well
1989 as an integer counter. */
1990 guard_type = targetm.cxx.guard_type ();
1991 guard = build_decl (VAR_DECL, sname, guard_type);
1993 /* The guard should have the same linkage as what it guards. */
1994 TREE_PUBLIC (guard) = TREE_PUBLIC (decl);
1995 TREE_STATIC (guard) = TREE_STATIC (decl);
1996 DECL_COMMON (guard) = DECL_COMMON (decl);
1997 DECL_ONE_ONLY (guard) = DECL_ONE_ONLY (decl);
1998 if (TREE_PUBLIC (decl))
1999 DECL_WEAK (guard) = DECL_WEAK (decl);
2001 DECL_ARTIFICIAL (guard) = 1;
2002 TREE_USED (guard) = 1;
2003 pushdecl_top_level_and_finish (guard, NULL_TREE);
2008 /* Return those bits of the GUARD variable that should be set when the
2009 guarded entity is actually initialized. */
2012 get_guard_bits (tree guard)
2014 if (!targetm.cxx.guard_mask_bit ())
2016 /* We only set the first byte of the guard, in order to leave room
2017 for a mutex in the high-order bits. */
2018 guard = build1 (ADDR_EXPR,
2019 build_pointer_type (TREE_TYPE (guard)),
2021 guard = build1 (NOP_EXPR,
2022 build_pointer_type (char_type_node),
2024 guard = build1 (INDIRECT_REF, char_type_node, guard);
2030 /* Return an expression which determines whether or not the GUARD
2031 variable has already been initialized. */
2034 get_guard_cond (tree guard)
2038 /* Check to see if the GUARD is zero. */
2039 guard = get_guard_bits (guard);
2041 /* Mask off all but the low bit. */
2042 if (targetm.cxx.guard_mask_bit ())
2044 guard_value = integer_one_node;
2045 if (!same_type_p (TREE_TYPE (guard_value), TREE_TYPE (guard)))
2046 guard_value = convert (TREE_TYPE (guard), guard_value);
2047 guard = cp_build_binary_op (BIT_AND_EXPR, guard, guard_value);
2050 guard_value = integer_zero_node;
2051 if (!same_type_p (TREE_TYPE (guard_value), TREE_TYPE (guard)))
2052 guard_value = convert (TREE_TYPE (guard), guard_value);
2053 return cp_build_binary_op (EQ_EXPR, guard, guard_value);
2056 /* Return an expression which sets the GUARD variable, indicating that
2057 the variable being guarded has been initialized. */
2060 set_guard (tree guard)
2064 /* Set the GUARD to one. */
2065 guard = get_guard_bits (guard);
2066 guard_init = integer_one_node;
2067 if (!same_type_p (TREE_TYPE (guard_init), TREE_TYPE (guard)))
2068 guard_init = convert (TREE_TYPE (guard), guard_init);
2069 return build_modify_expr (guard, NOP_EXPR, guard_init);
2072 /* Start the process of running a particular set of global constructors
2073 or destructors. Subroutine of do_[cd]tors. */
2076 start_objects (int method_type, int initp)
2082 /* Make ctor or dtor function. METHOD_TYPE may be 'I' or 'D'. */
2084 if (initp != DEFAULT_INIT_PRIORITY)
2094 sprintf (type, "%c%c%.5u", method_type, joiner, initp);
2097 sprintf (type, "%c", method_type);
2099 fndecl = build_lang_decl (FUNCTION_DECL,
2100 get_file_function_name_long (type),
2101 build_function_type (void_type_node,
2103 start_preparsed_function (fndecl, /*attrs=*/NULL_TREE, SF_PRE_PARSED);
2105 /* It can be a static function as long as collect2 does not have
2106 to scan the object file to find its ctor/dtor routine. */
2107 TREE_PUBLIC (current_function_decl) = ! targetm.have_ctors_dtors;
2109 /* Mark this declaration as used to avoid spurious warnings. */
2110 TREE_USED (current_function_decl) = 1;
2112 /* Mark this function as a global constructor or destructor. */
2113 if (method_type == 'I')
2114 DECL_GLOBAL_CTOR_P (current_function_decl) = 1;
2116 DECL_GLOBAL_DTOR_P (current_function_decl) = 1;
2117 DECL_LANG_SPECIFIC (current_function_decl)->decl_flags.u2sel = 1;
2119 body = begin_compound_stmt (BCS_FN_BODY);
2121 /* We cannot allow these functions to be elided, even if they do not
2122 have external linkage. And, there's no point in deferring
2123 compilation of thes functions; they're all going to have to be
2125 DECL_INLINE (current_function_decl) = 0;
2126 DECL_UNINLINABLE (current_function_decl) = 1;
2131 /* Finish the process of running a particular set of global constructors
2132 or destructors. Subroutine of do_[cd]tors. */
2135 finish_objects (int method_type, int initp, tree body)
2140 finish_compound_stmt (body);
2141 fn = finish_function (0);
2142 expand_or_defer_fn (fn);
2144 /* When only doing semantic analysis, and no RTL generation, we
2145 can't call functions that directly emit assembly code; there is
2146 no assembly file in which to put the code. */
2147 if (flag_syntax_only)
2150 if (targetm.have_ctors_dtors)
2152 rtx fnsym = XEXP (DECL_RTL (fn), 0);
2153 if (method_type == 'I')
2154 (* targetm.asm_out.constructor) (fnsym, initp);
2156 (* targetm.asm_out.destructor) (fnsym, initp);
2160 /* The names of the parameters to the function created to handle
2161 initializations and destructions for objects with static storage
2163 #define INITIALIZE_P_IDENTIFIER "__initialize_p"
2164 #define PRIORITY_IDENTIFIER "__priority"
2166 /* The name of the function we create to handle initializations and
2167 destructions for objects with static storage duration. */
2168 #define SSDF_IDENTIFIER "__static_initialization_and_destruction"
2170 /* The declaration for the __INITIALIZE_P argument. */
2171 static GTY(()) tree initialize_p_decl;
2173 /* The declaration for the __PRIORITY argument. */
2174 static GTY(()) tree priority_decl;
2176 /* The declaration for the static storage duration function. */
2177 static GTY(()) tree ssdf_decl;
2179 /* All the static storage duration functions created in this
2180 translation unit. */
2181 static GTY(()) varray_type ssdf_decls;
2183 /* A map from priority levels to information about that priority
2184 level. There may be many such levels, so efficient lookup is
2186 static splay_tree priority_info_map;
2188 /* Begins the generation of the function that will handle all
2189 initialization and destruction of objects with static storage
2190 duration. The function generated takes two parameters of type
2191 `int': __INITIALIZE_P and __PRIORITY. If __INITIALIZE_P is
2192 nonzero, it performs initializations. Otherwise, it performs
2193 destructions. It only performs those initializations or
2194 destructions with the indicated __PRIORITY. The generated function
2197 It is assumed that this function will only be called once per
2198 translation unit. */
2201 start_static_storage_duration_function (unsigned count)
2206 char id[sizeof (SSDF_IDENTIFIER) + 1 /* '\0' */ + 32];
2208 /* Create the identifier for this function. It will be of the form
2209 SSDF_IDENTIFIER_<number>. */
2210 sprintf (id, "%s_%u", SSDF_IDENTIFIER, count);
2212 /* Create the parameters. */
2213 parm_types = void_list_node;
2214 parm_types = tree_cons (NULL_TREE, integer_type_node, parm_types);
2215 parm_types = tree_cons (NULL_TREE, integer_type_node, parm_types);
2216 type = build_function_type (void_type_node, parm_types);
2218 /* Create the FUNCTION_DECL itself. */
2219 ssdf_decl = build_lang_decl (FUNCTION_DECL,
2220 get_identifier (id),
2222 TREE_PUBLIC (ssdf_decl) = 0;
2223 DECL_ARTIFICIAL (ssdf_decl) = 1;
2225 /* Put this function in the list of functions to be called from the
2226 static constructors and destructors. */
2229 VARRAY_TREE_INIT (ssdf_decls, 32, "ssdf_decls");
2231 /* Take this opportunity to initialize the map from priority
2232 numbers to information about that priority level. */
2233 priority_info_map = splay_tree_new (splay_tree_compare_ints,
2234 /*delete_key_fn=*/0,
2235 /*delete_value_fn=*/
2236 (splay_tree_delete_value_fn) &free);
2238 /* We always need to generate functions for the
2239 DEFAULT_INIT_PRIORITY so enter it now. That way when we walk
2240 priorities later, we'll be sure to find the
2241 DEFAULT_INIT_PRIORITY. */
2242 get_priority_info (DEFAULT_INIT_PRIORITY);
2245 VARRAY_PUSH_TREE (ssdf_decls, ssdf_decl);
2247 /* Create the argument list. */
2248 initialize_p_decl = cp_build_parm_decl
2249 (get_identifier (INITIALIZE_P_IDENTIFIER), integer_type_node);
2250 DECL_CONTEXT (initialize_p_decl) = ssdf_decl;
2251 TREE_USED (initialize_p_decl) = 1;
2252 priority_decl = cp_build_parm_decl
2253 (get_identifier (PRIORITY_IDENTIFIER), integer_type_node);
2254 DECL_CONTEXT (priority_decl) = ssdf_decl;
2255 TREE_USED (priority_decl) = 1;
2257 TREE_CHAIN (initialize_p_decl) = priority_decl;
2258 DECL_ARGUMENTS (ssdf_decl) = initialize_p_decl;
2260 /* Put the function in the global scope. */
2261 pushdecl (ssdf_decl);
2263 /* Start the function itself. This is equivalent to declaring the
2266 static void __ssdf (int __initialize_p, init __priority_p);
2268 It is static because we only need to call this function from the
2269 various constructor and destructor functions for this module. */
2270 start_preparsed_function (ssdf_decl,
2271 /*attrs=*/NULL_TREE,
2274 /* Set up the scope of the outermost block in the function. */
2275 body = begin_compound_stmt (BCS_FN_BODY);
2277 /* This function must not be deferred because we are depending on
2278 its compilation to tell us what is TREE_SYMBOL_REFERENCED. */
2279 DECL_INLINE (ssdf_decl) = 0;
2280 DECL_UNINLINABLE (ssdf_decl) = 1;
2285 /* Finish the generation of the function which performs initialization
2286 and destruction of objects with static storage duration. After
2287 this point, no more such objects can be created. */
2290 finish_static_storage_duration_function (tree body)
2292 /* Close out the function. */
2293 finish_compound_stmt (body);
2294 expand_or_defer_fn (finish_function (0));
2297 /* Return the information about the indicated PRIORITY level. If no
2298 code to handle this level has yet been generated, generate the
2299 appropriate prologue. */
2301 static priority_info
2302 get_priority_info (int priority)
2307 n = splay_tree_lookup (priority_info_map,
2308 (splay_tree_key) priority);
2311 /* Create a new priority information structure, and insert it
2313 pi = xmalloc (sizeof (struct priority_info_s));
2314 pi->initializations_p = 0;
2315 pi->destructions_p = 0;
2316 splay_tree_insert (priority_info_map,
2317 (splay_tree_key) priority,
2318 (splay_tree_value) pi);
2321 pi = (priority_info) n->value;
2326 /* Set up to handle the initialization or destruction of DECL. If
2327 INITP is nonzero, we are initializing the variable. Otherwise, we
2328 are destroying it. */
2331 start_static_initialization_or_destruction (tree decl, int initp)
2333 tree guard_if_stmt = NULL_TREE;
2340 /* Figure out the priority for this declaration. */
2341 priority = DECL_INIT_PRIORITY (decl);
2343 priority = DEFAULT_INIT_PRIORITY;
2345 /* Remember that we had an initialization or finalization at this
2347 pi = get_priority_info (priority);
2349 pi->initializations_p = 1;
2351 pi->destructions_p = 1;
2353 /* Trick the compiler into thinking we are at the file and line
2354 where DECL was declared so that error-messages make sense, and so
2355 that the debugger will show somewhat sensible file and line
2357 input_location = DECL_SOURCE_LOCATION (decl);
2363 Access control for implicit calls to the constructors,
2364 the conversion functions, or the destructor called to
2365 create and destroy a static data member is performed as
2366 if these calls appeared in the scope of the member's
2369 we pretend we are in a static member function of the class of
2370 which the DECL is a member. */
2371 if (member_p (decl))
2373 DECL_CONTEXT (current_function_decl) = DECL_CONTEXT (decl);
2374 DECL_STATIC_FUNCTION_P (current_function_decl) = 1;
2377 /* Conditionalize this initialization on being in the right priority
2378 and being initializing/finalizing appropriately. */
2379 guard_if_stmt = begin_if_stmt ();
2380 cond = cp_build_binary_op (EQ_EXPR,
2382 build_int_cst (NULL_TREE, priority));
2383 init_cond = initp ? integer_one_node : integer_zero_node;
2384 init_cond = cp_build_binary_op (EQ_EXPR,
2387 cond = cp_build_binary_op (TRUTH_ANDIF_EXPR, cond, init_cond);
2389 /* Assume we don't need a guard. */
2391 /* We need a guard if this is an object with external linkage that
2392 might be initialized in more than one place. (For example, a
2393 static data member of a template, when the data member requires
2395 if (TREE_PUBLIC (decl) && (DECL_COMMON (decl)
2396 || DECL_ONE_ONLY (decl)
2397 || DECL_WEAK (decl)))
2401 guard = get_guard (decl);
2403 /* When using __cxa_atexit, we just check the GUARD as we would
2404 for a local static. */
2405 if (flag_use_cxa_atexit)
2407 /* When using __cxa_atexit, we never try to destroy
2408 anything from a static destructor. */
2410 guard_cond = get_guard_cond (guard);
2412 /* If we don't have __cxa_atexit, then we will be running
2413 destructors from .fini sections, or their equivalents. So,
2414 we need to know how many times we've tried to initialize this
2415 object. We do initializations only if the GUARD is zero,
2416 i.e., if we are the first to initialize the variable. We do
2417 destructions only if the GUARD is one, i.e., if we are the
2418 last to destroy the variable. */
2421 = cp_build_binary_op (EQ_EXPR,
2422 build_unary_op (PREINCREMENT_EXPR,
2428 = cp_build_binary_op (EQ_EXPR,
2429 build_unary_op (PREDECREMENT_EXPR,
2434 cond = cp_build_binary_op (TRUTH_ANDIF_EXPR, cond, guard_cond);
2437 finish_if_stmt_cond (cond, guard_if_stmt);
2439 /* If we're using __cxa_atexit, we have not already set the GUARD,
2440 so we must do so now. */
2441 if (guard && initp && flag_use_cxa_atexit)
2442 finish_expr_stmt (set_guard (guard));
2444 return guard_if_stmt;
2447 /* We've just finished generating code to do an initialization or
2448 finalization. GUARD_IF_STMT is the if-statement we used to guard
2449 the initialization. */
2452 finish_static_initialization_or_destruction (tree guard_if_stmt)
2454 finish_then_clause (guard_if_stmt);
2455 finish_if_stmt (guard_if_stmt);
2457 /* Now that we're done with DECL we don't need to pretend to be a
2458 member of its class any longer. */
2459 DECL_CONTEXT (current_function_decl) = NULL_TREE;
2460 DECL_STATIC_FUNCTION_P (current_function_decl) = 0;
2463 /* Generate code to do the initialization of DECL, a VAR_DECL with
2464 static storage duration. The initialization is INIT. */
2467 do_static_initialization (tree decl, tree init)
2471 /* Set up for the initialization. */
2473 = start_static_initialization_or_destruction (decl,
2476 /* Perform the initialization. */
2478 finish_expr_stmt (init);
2480 /* If we're using __cxa_atexit, register a a function that calls the
2481 destructor for the object. */
2482 if (flag_use_cxa_atexit)
2483 finish_expr_stmt (register_dtor_fn (decl));
2486 finish_static_initialization_or_destruction (guard_if_stmt);
2489 /* Generate code to do the static destruction of DECL. If DECL may be
2490 initialized more than once in different object files, GUARD is the
2491 guard variable to check. PRIORITY is the priority for the
2495 do_static_destruction (tree decl)
2499 /* If we're using __cxa_atexit, then destructors are registered
2500 immediately after objects are initialized. */
2501 gcc_assert (!flag_use_cxa_atexit);
2503 /* If we don't need a destructor, there's nothing to do. */
2504 if (TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
2507 /* Actually do the destruction. */
2508 guard_if_stmt = start_static_initialization_or_destruction (decl,
2510 finish_expr_stmt (build_cleanup (decl));
2511 finish_static_initialization_or_destruction (guard_if_stmt);
2514 /* VARS is a list of variables with static storage duration which may
2515 need initialization and/or finalization. Remove those variables
2516 that don't really need to be initialized or finalized, and return
2517 the resulting list. The order in which the variables appear in
2518 VARS is in reverse order of the order in which they should actually
2519 be initialized. The list we return is in the unreversed order;
2520 i.e., the first variable should be initialized first. */
2523 prune_vars_needing_no_initialization (tree *vars)
2526 tree result = NULL_TREE;
2531 tree decl = TREE_VALUE (t);
2532 tree init = TREE_PURPOSE (t);
2534 /* Deal gracefully with error. */
2535 if (decl == error_mark_node)
2537 var = &TREE_CHAIN (t);
2541 /* The only things that can be initialized are variables. */
2542 gcc_assert (TREE_CODE (decl) == VAR_DECL);
2544 /* If this object is not defined, we don't need to do anything
2546 if (DECL_EXTERNAL (decl))
2548 var = &TREE_CHAIN (t);
2552 /* Also, if the initializer already contains errors, we can bail
2554 if (init && TREE_CODE (init) == TREE_LIST
2555 && value_member (error_mark_node, init))
2557 var = &TREE_CHAIN (t);
2561 /* This variable is going to need initialization and/or
2562 finalization, so we add it to the list. */
2563 *var = TREE_CHAIN (t);
2564 TREE_CHAIN (t) = result;
2571 /* Make sure we have told the back end about all the variables in
2575 write_out_vars (tree vars)
2579 for (v = vars; v; v = TREE_CHAIN (v))
2581 tree var = TREE_VALUE (v);
2582 if (!var_finalized_p (var))
2584 import_export_decl (var);
2585 rest_of_decl_compilation (var, 1, 1);
2590 /* Generate a static constructor (if CONSTRUCTOR_P) or destructor
2591 (otherwise) that will initialize all gobal objects with static
2592 storage duration having the indicated PRIORITY. */
2595 generate_ctor_or_dtor_function (bool constructor_p, int priority,
2604 input_location = *locus;
2605 #ifdef USE_MAPPED_LOCATION
2611 /* We use `I' to indicate initialization and `D' to indicate
2613 function_key = constructor_p ? 'I' : 'D';
2615 /* We emit the function lazily, to avoid generating empty
2616 global constructors and destructors. */
2619 /* Call the static storage duration function with appropriate
2622 for (i = 0; i < ssdf_decls->elements_used; ++i)
2624 fndecl = VARRAY_TREE (ssdf_decls, i);
2626 /* Calls to pure or const functions will expand to nothing. */
2627 if (! (flags_from_decl_or_type (fndecl) & (ECF_CONST | ECF_PURE)))
2630 body = start_objects (function_key, priority);
2632 arguments = tree_cons (NULL_TREE,
2633 build_int_cst (NULL_TREE, priority),
2635 arguments = tree_cons (NULL_TREE,
2636 build_int_cst (NULL_TREE, constructor_p),
2638 finish_expr_stmt (build_function_call (fndecl, arguments));
2642 /* If we're generating code for the DEFAULT_INIT_PRIORITY, throw in
2643 calls to any functions marked with attributes indicating that
2644 they should be called at initialization- or destruction-time. */
2645 if (priority == DEFAULT_INIT_PRIORITY)
2649 for (fns = constructor_p ? static_ctors : static_dtors;
2651 fns = TREE_CHAIN (fns))
2653 fndecl = TREE_VALUE (fns);
2655 /* Calls to pure/const functions will expand to nothing. */
2656 if (! (flags_from_decl_or_type (fndecl) & (ECF_CONST | ECF_PURE)))
2659 body = start_objects (function_key, priority);
2660 finish_expr_stmt (build_function_call (fndecl, NULL_TREE));
2665 /* Close out the function. */
2667 finish_objects (function_key, priority, body);
2670 /* Generate constructor and destructor functions for the priority
2674 generate_ctor_and_dtor_functions_for_priority (splay_tree_node n, void * data)
2676 location_t *locus = data;
2677 int priority = (int) n->key;
2678 priority_info pi = (priority_info) n->value;
2680 /* Generate the functions themselves, but only if they are really
2682 if (pi->initializations_p
2683 || (priority == DEFAULT_INIT_PRIORITY && static_ctors))
2684 generate_ctor_or_dtor_function (/*constructor_p=*/true, priority, locus);
2685 if (pi->destructions_p
2686 || (priority == DEFAULT_INIT_PRIORITY && static_dtors))
2687 generate_ctor_or_dtor_function (/*constructor_p=*/false, priority, locus);
2689 /* Keep iterating. */
2693 /* Called via LANGHOOK_CALLGRAPH_ANALYZE_EXPR. It is supposed to mark
2694 decls referenced from frontend specific constructs; it will be called
2695 only for language-specific tree nodes.
2697 Here we must deal with member pointers. */
2700 cxx_callgraph_analyze_expr (tree *tp, int *walk_subtrees ATTRIBUTE_UNUSED,
2701 tree from ATTRIBUTE_UNUSED)
2705 switch (TREE_CODE (t))
2708 if (TYPE_PTRMEMFUNC_P (TREE_TYPE (t)))
2709 cgraph_mark_needed_node (cgraph_node (PTRMEM_CST_MEMBER (t)));
2712 if (TREE_CODE (BASELINK_FUNCTIONS (t)) == FUNCTION_DECL)
2713 cgraph_mark_needed_node (cgraph_node (BASELINK_FUNCTIONS (t)));
2716 if (DECL_VTABLE_OR_VTT_P (t))
2718 /* The ABI requires that all virtual tables be emitted
2719 whenever one of them is. */
2721 for (vtbl = CLASSTYPE_VTABLES (DECL_CONTEXT (t));
2723 vtbl = TREE_CHAIN (vtbl))
2724 mark_decl_referenced (vtbl);
2726 else if (DECL_CONTEXT (t)
2727 && TREE_CODE (DECL_CONTEXT (t)) == FUNCTION_DECL)
2728 /* If we need a static variable in a function, then we
2729 need the containing function. */
2730 mark_decl_referenced (DECL_CONTEXT (t));
2739 /* This routine is called from the last rule in yyparse ().
2740 Its job is to create all the code needed to initialize and
2741 destroy the global aggregates. We do the destruction
2742 first, since that way we only need to reverse the decls once. */
2745 cp_finish_file (void)
2751 unsigned ssdf_count = 0;
2754 locus = input_location;
2757 /* Bad parse errors. Just forget about it. */
2758 if (! global_bindings_p () || current_class_type || decl_namespace_list)
2762 c_common_write_pch ();
2764 #ifdef USE_MAPPED_LOCATION
2767 /* Otherwise, GDB can get confused, because in only knows
2768 about source for LINENO-1 lines. */
2772 /* We now have to write out all the stuff we put off writing out.
2775 o Template specializations that we have not yet instantiated,
2776 but which are needed.
2777 o Initialization and destruction for non-local objects with
2778 static storage duration. (Local objects with static storage
2779 duration are initialized when their scope is first entered,
2780 and are cleaned up via atexit.)
2781 o Virtual function tables.
2783 All of these may cause others to be needed. For example,
2784 instantiating one function may cause another to be needed, and
2785 generating the initializer for an object may cause templates to be
2786 instantiated, etc., etc. */
2788 timevar_push (TV_VARCONST);
2790 emit_support_tinfos ();
2798 /* If there are templates that we've put off instantiating, do
2800 instantiate_pending_templates (retries);
2803 /* Write out virtual tables as required. Note that writing out
2804 the virtual table for a template class may cause the
2805 instantiation of members of that class. If we write out
2806 vtables then we remove the class from our list so we don't
2807 have to look at it again. */
2809 while (keyed_classes != NULL_TREE
2810 && maybe_emit_vtables (TREE_VALUE (keyed_classes)))
2813 keyed_classes = TREE_CHAIN (keyed_classes);
2819 tree next = TREE_CHAIN (t);
2823 if (maybe_emit_vtables (TREE_VALUE (next)))
2826 TREE_CHAIN (t) = TREE_CHAIN (next);
2831 next = TREE_CHAIN (t);
2835 /* Write out needed type info variables. We have to be careful
2836 looping through unemitted decls, because emit_tinfo_decl may
2837 cause other variables to be needed. New elements will be
2838 appended, and we remove from the vector those that actually
2840 for (i = VEC_length (tree, unemitted_tinfo_decls);
2841 VEC_iterate (tree, unemitted_tinfo_decls, --i, t);)
2842 if (emit_tinfo_decl (t))
2845 VEC_unordered_remove (tree, unemitted_tinfo_decls, i);
2848 /* The list of objects with static storage duration is built up
2849 in reverse order. We clear STATIC_AGGREGATES so that any new
2850 aggregates added during the initialization of these will be
2851 initialized in the correct order when we next come around the
2853 vars = prune_vars_needing_no_initialization (&static_aggregates);
2859 /* We need to start a new initialization function each time
2860 through the loop. That's because we need to know which
2861 vtables have been referenced, and TREE_SYMBOL_REFERENCED
2862 isn't computed until a function is finished, and written
2863 out. That's a deficiency in the back-end. When this is
2864 fixed, these initialization functions could all become
2865 inline, with resulting performance improvements. */
2868 /* Set the line and file, so that it is obviously not from
2870 input_location = locus;
2871 ssdf_body = start_static_storage_duration_function (ssdf_count);
2873 /* Make sure the back end knows about all the variables. */
2874 write_out_vars (vars);
2876 /* First generate code to do all the initializations. */
2877 for (v = vars; v; v = TREE_CHAIN (v))
2878 do_static_initialization (TREE_VALUE (v),
2881 /* Then, generate code to do all the destructions. Do these
2882 in reverse order so that the most recently constructed
2883 variable is the first destroyed. If we're using
2884 __cxa_atexit, then we don't need to do this; functions
2885 were registered at initialization time to destroy the
2887 if (!flag_use_cxa_atexit)
2889 vars = nreverse (vars);
2890 for (v = vars; v; v = TREE_CHAIN (v))
2891 do_static_destruction (TREE_VALUE (v));
2896 /* Finish up the static storage duration function for this
2898 input_location = locus;
2899 finish_static_storage_duration_function (ssdf_body);
2901 /* All those initializations and finalizations might cause
2902 us to need more inline functions, more template
2903 instantiations, etc. */
2906 #ifdef USE_MAPPED_LOCATION
2913 /* Go through the set of inline functions whose bodies have not
2914 been emitted yet. If out-of-line copies of these functions
2915 are required, emit them. */
2916 for (i = 0; i < deferred_fns_used; ++i)
2918 tree decl = VARRAY_TREE (deferred_fns, i);
2920 /* Does it need synthesizing? */
2921 if (DECL_ARTIFICIAL (decl) && ! DECL_INITIAL (decl)
2922 && (! DECL_REALLY_EXTERN (decl) || DECL_INLINE (decl)))
2924 /* Even though we're already at the top-level, we push
2925 there again. That way, when we pop back a few lines
2926 hence, all of our state is restored. Otherwise,
2927 finish_function doesn't clean things up, and we end
2928 up with CURRENT_FUNCTION_DECL set. */
2929 push_to_top_level ();
2930 synthesize_method (decl);
2931 pop_from_top_level ();
2935 if (!DECL_SAVED_TREE (decl))
2938 import_export_decl (decl);
2940 /* We lie to the back-end, pretending that some functions
2941 are not defined when they really are. This keeps these
2942 functions from being put out unnecessarily. But, we must
2943 stop lying when the functions are referenced, or if they
2944 are not comdat since they need to be put out now. This
2945 is done in a separate for cycle, because if some deferred
2946 function is contained in another deferred function later
2947 in deferred_fns varray, rest_of_compilation would skip
2948 this function and we really cannot expand the same
2950 if (DECL_NOT_REALLY_EXTERN (decl)
2951 && DECL_INITIAL (decl)
2952 && decl_needed_p (decl))
2953 DECL_EXTERNAL (decl) = 0;
2955 /* If we're going to need to write this function out, and
2956 there's already a body for it, create RTL for it now.
2957 (There might be no body if this is a method we haven't
2958 gotten around to synthesizing yet.) */
2959 if (!DECL_EXTERNAL (decl)
2960 && decl_needed_p (decl)
2961 && !TREE_ASM_WRITTEN (decl)
2962 && !cgraph_node (decl)->local.finalized)
2964 /* We will output the function; no longer consider it in this
2966 DECL_DEFER_OUTPUT (decl) = 0;
2967 /* Generate RTL for this function now that we know we
2969 expand_or_defer_fn (decl);
2970 /* If we're compiling -fsyntax-only pretend that this
2971 function has been written out so that we don't try to
2973 if (flag_syntax_only)
2974 TREE_ASM_WRITTEN (decl) = 1;
2979 if (walk_namespaces (wrapup_globals_for_namespace, /*data=*/0))
2982 /* Static data members are just like namespace-scope globals. */
2983 for (i = 0; i < pending_statics_used; ++i)
2985 tree decl = VARRAY_TREE (pending_statics, i);
2986 if (var_finalized_p (decl) || DECL_REALLY_EXTERN (decl))
2988 import_export_decl (decl);
2989 /* If this static data member is needed, provide it to the
2991 if (DECL_NOT_REALLY_EXTERN (decl) && decl_needed_p (decl))
2992 DECL_EXTERNAL (decl) = 0;
2995 && wrapup_global_declarations (&VARRAY_TREE (pending_statics, 0),
2996 pending_statics_used))
2999 /* Ask the back end to emit functions and variables that are
3000 enqueued. These emissions may result in marking more entities
3002 if (cgraph_assemble_pending_functions ())
3004 if (cgraph_varpool_assemble_pending_decls ())
3011 /* All used inline functions must have a definition at this point. */
3012 for (i = 0; i < deferred_fns_used; ++i)
3014 tree decl = VARRAY_TREE (deferred_fns, i);
3016 if (/* Check online inline functions that were actually used. */
3017 TREE_USED (decl) && DECL_DECLARED_INLINE_P (decl)
3018 /* But not defined. */
3019 && DECL_REALLY_EXTERN (decl)
3020 /* If we decided to emit this function in another
3021 translation unit, the fact that the definition was
3022 missing here likely indicates only that the repository
3023 decided to place the function elsewhere. With -Winline,
3024 we will still warn if we could not inline the
3026 && !flag_use_repository
3027 /* An explicit instantiation can be used to specify
3028 that the body is in another unit. It will have
3029 already verified there was a definition. */
3030 && !DECL_EXPLICIT_INSTANTIATION (decl))
3032 cp_warning_at ("inline function %qD used but never defined", decl);
3033 /* This symbol is effectively an "extern" declaration now.
3034 This is not strictly necessary, but removes a duplicate
3036 TREE_PUBLIC (decl) = 1;
3040 /* We give C linkage to static constructors and destructors. */
3041 push_lang_context (lang_name_c);
3043 /* Generate initialization and destruction functions for all
3044 priorities for which they are required. */
3045 if (priority_info_map)
3046 splay_tree_foreach (priority_info_map,
3047 generate_ctor_and_dtor_functions_for_priority,
3053 generate_ctor_or_dtor_function (/*constructor_p=*/true,
3054 DEFAULT_INIT_PRIORITY, &locus);
3056 generate_ctor_or_dtor_function (/*constructor_p=*/false,
3057 DEFAULT_INIT_PRIORITY, &locus);
3060 /* We're done with the splay-tree now. */
3061 if (priority_info_map)
3062 splay_tree_delete (priority_info_map);
3064 /* Generate any missing aliases. */
3065 maybe_apply_pending_pragma_weaks ();
3067 /* We're done with static constructors, so we can go back to "C++"
3069 pop_lang_context ();
3071 cgraph_finalize_compilation_unit ();
3074 /* Now, issue warnings about static, but not defined, functions,
3075 etc., and emit debugging information. */
3076 walk_namespaces (wrapup_globals_for_namespace, /*data=*/&reconsider);
3077 if (pending_statics)
3078 check_global_declarations (&VARRAY_TREE (pending_statics, 0),
3079 pending_statics_used);
3083 /* The entire file is now complete. If requested, dump everything
3087 FILE *stream = dump_begin (TDI_tu, &flags);
3091 dump_node (global_namespace, flags & ~TDF_SLIM, stream);
3092 dump_end (TDI_tu, stream);
3096 timevar_pop (TV_VARCONST);
3098 if (flag_detailed_statistics)
3100 dump_tree_statistics ();
3101 dump_time_statistics ();
3103 input_location = locus;
3105 #ifdef ENABLE_CHECKING
3106 validate_conversion_obstack ();
3107 #endif /* ENABLE_CHECKING */
3110 /* FN is an OFFSET_REF, DOTSTAR_EXPR or MEMBER_REF indicating the
3111 function to call in parse-tree form; it has not yet been
3112 semantically analyzed. ARGS are the arguments to the function.
3113 They have already been semantically analyzed. */
3116 build_offset_ref_call_from_tree (tree fn, tree args)
3125 object = TREE_OPERAND (fn, 0);
3127 if (processing_template_decl)
3129 gcc_assert (TREE_CODE (fn) == DOTSTAR_EXPR
3130 || TREE_CODE (fn) == MEMBER_REF);
3131 if (type_dependent_expression_p (fn)
3132 || any_type_dependent_arguments_p (args))
3133 return build_min_nt (CALL_EXPR, fn, args, NULL_TREE);
3135 /* Transform the arguments and add the implicit "this"
3136 parameter. That must be done before the FN is transformed
3137 because we depend on the form of FN. */
3138 args = build_non_dependent_args (args);
3139 if (TREE_CODE (fn) == DOTSTAR_EXPR)
3140 object = build_unary_op (ADDR_EXPR, object, 0);
3141 object = build_non_dependent_expr (object);
3142 args = tree_cons (NULL_TREE, object, args);
3143 /* Now that the arguments are done, transform FN. */
3144 fn = build_non_dependent_expr (fn);
3147 /* A qualified name corresponding to a bound pointer-to-member is
3148 represented as an OFFSET_REF:
3150 struct B { void g(); };
3152 void B::g() { (this->*p)(); } */
3153 if (TREE_CODE (fn) == OFFSET_REF)
3155 tree object_addr = build_unary_op (ADDR_EXPR, object, 0);
3156 fn = TREE_OPERAND (fn, 1);
3157 fn = get_member_function_from_ptrfunc (&object_addr, fn);
3158 args = tree_cons (NULL_TREE, object_addr, args);
3161 expr = build_function_call (fn, args);
3162 if (processing_template_decl && expr != error_mark_node)
3163 return build_min_non_dep (CALL_EXPR, expr, orig_fn, orig_args, NULL_TREE);
3169 check_default_args (tree x)
3171 tree arg = TYPE_ARG_TYPES (TREE_TYPE (x));
3172 bool saw_def = false;
3173 int i = 0 - (TREE_CODE (TREE_TYPE (x)) == METHOD_TYPE);
3174 for (; arg && arg != void_list_node; arg = TREE_CHAIN (arg), ++i)
3176 if (TREE_PURPOSE (arg))
3180 cp_error_at ("default argument missing for parameter %P of %q+#D",
3188 mark_used (tree decl)
3190 TREE_USED (decl) = 1;
3191 if (processing_template_decl || skip_evaluation)
3194 if (TREE_CODE (decl) == FUNCTION_DECL && DECL_DECLARED_INLINE_P (decl)
3195 && !TREE_ASM_WRITTEN (decl))
3196 /* Remember it, so we can check it was defined. */
3198 if (DECL_DEFERRED_FN (decl))
3200 note_vague_linkage_fn (decl);
3203 assemble_external (decl);
3205 /* Is it a synthesized method that needs to be synthesized? */
3206 if (TREE_CODE (decl) == FUNCTION_DECL
3207 && DECL_NONSTATIC_MEMBER_FUNCTION_P (decl)
3208 && DECL_ARTIFICIAL (decl)
3209 && !DECL_THUNK_P (decl)
3210 && ! DECL_INITIAL (decl)
3211 /* Kludge: don't synthesize for default args. */
3212 && current_function_decl)
3214 synthesize_method (decl);
3215 /* If we've already synthesized the method we don't need to
3216 instantiate it, so we can return right away. */
3220 /* If this is a function or variable that is an instance of some
3221 template, we now know that we will need to actually do the
3222 instantiation. We check that DECL is not an explicit
3223 instantiation because that is not checked in instantiate_decl. */
3224 if ((DECL_NON_THUNK_FUNCTION_P (decl) || TREE_CODE (decl) == VAR_DECL)
3225 && DECL_LANG_SPECIFIC (decl) && DECL_TEMPLATE_INFO (decl)
3226 && (!DECL_EXPLICIT_INSTANTIATION (decl)
3227 || (TREE_CODE (decl) == FUNCTION_DECL
3228 && DECL_INLINE (DECL_TEMPLATE_RESULT
3229 (template_for_substitution (decl))))))
3230 /* We put off instantiating functions in order to improve compile
3231 times. Maintaining a stack of active functions is expensive,
3232 and the inliner knows to instantiate any functions it might
3234 instantiate_decl (decl, /*defer_ok=*/true, /*undefined_ok=*/0);
3237 #include "gt-cp-decl2.h"