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)
1189 if (anon_union_decl == error_mark_node)
1192 type = TREE_TYPE (anon_union_decl);
1193 public_p = TREE_PUBLIC (anon_union_decl);
1195 /* The VAR_DECL's context is the same as the TYPE's context. */
1196 DECL_CONTEXT (anon_union_decl) = DECL_CONTEXT (TYPE_NAME (type));
1198 if (TYPE_FIELDS (type) == NULL_TREE)
1203 error ("namespace-scope anonymous aggregates must be static");
1207 main_decl = build_anon_union_vars (anon_union_decl);
1208 if (main_decl == NULL_TREE)
1210 warning ("anonymous union with no members");
1214 if (!processing_template_decl)
1216 /* Use main_decl to set the mangled name. */
1217 DECL_NAME (anon_union_decl) = DECL_NAME (main_decl);
1218 mangle_decl (anon_union_decl);
1219 DECL_NAME (anon_union_decl) = NULL_TREE;
1222 pushdecl (anon_union_decl);
1223 if (building_stmt_tree ()
1224 && at_function_scope_p ())
1225 add_decl_expr (anon_union_decl);
1226 else if (!processing_template_decl)
1227 rest_of_decl_compilation (anon_union_decl,
1228 toplevel_bindings_p (), at_eof);
1231 /* Auxiliary functions to make type signatures for
1232 `operator new' and `operator delete' correspond to
1233 what compiler will be expecting. */
1236 coerce_new_type (tree type)
1239 tree args = TYPE_ARG_TYPES (type);
1241 gcc_assert (TREE_CODE (type) == FUNCTION_TYPE);
1243 if (!same_type_p (TREE_TYPE (type), ptr_type_node))
1246 error ("%<operator new%> must return type %qT", ptr_type_node);
1249 if (!args || args == void_list_node
1250 || !same_type_p (TREE_VALUE (args), size_type_node))
1253 if (args && args != void_list_node)
1254 args = TREE_CHAIN (args);
1255 pedwarn ("%<operator new%> takes type %<size_t%> (%qT) "
1256 "as first parameter", size_type_node);
1261 args = tree_cons (NULL_TREE, size_type_node, args);
1264 type = build_exception_variant
1265 (build_function_type (ptr_type_node, args),
1266 TYPE_RAISES_EXCEPTIONS (type));
1274 coerce_delete_type (tree type)
1277 tree args = TYPE_ARG_TYPES (type);
1279 gcc_assert (TREE_CODE (type) == FUNCTION_TYPE);
1281 if (!same_type_p (TREE_TYPE (type), void_type_node))
1284 error ("%<operator delete%> must return type %qT", void_type_node);
1287 if (!args || args == void_list_node
1288 || !same_type_p (TREE_VALUE (args), ptr_type_node))
1291 if (args && args != void_list_node)
1292 args = TREE_CHAIN (args);
1293 error ("%<operator delete%> takes type %qT as first parameter",
1299 args = tree_cons (NULL_TREE, ptr_type_node, args);
1302 type = build_exception_variant
1303 (build_function_type (void_type_node, args),
1304 TYPE_RAISES_EXCEPTIONS (type));
1313 mark_vtable_entries (tree decl)
1315 tree entries = CONSTRUCTOR_ELTS (DECL_INITIAL (decl));
1317 for (; entries; entries = TREE_CHAIN (entries))
1319 tree fnaddr = TREE_VALUE (entries);
1322 STRIP_NOPS (fnaddr);
1324 if (TREE_CODE (fnaddr) != ADDR_EXPR
1325 && TREE_CODE (fnaddr) != FDESC_EXPR)
1326 /* This entry is an offset: a virtual base class offset, a
1327 virtual call offset, an RTTI offset, etc. */
1330 fn = TREE_OPERAND (fnaddr, 0);
1331 TREE_ADDRESSABLE (fn) = 1;
1332 /* When we don't have vcall offsets, we output thunks whenever
1333 we output the vtables that contain them. With vcall offsets,
1334 we know all the thunks we'll need when we emit a virtual
1335 function, so we emit the thunks there instead. */
1336 if (DECL_THUNK_P (fn))
1337 use_thunk (fn, /*emit_p=*/0);
1342 /* Set DECL up to have the closest approximation of "initialized common"
1343 linkage available. */
1346 comdat_linkage (tree decl)
1349 make_decl_one_only (decl);
1350 else if (TREE_CODE (decl) == FUNCTION_DECL
1351 || (TREE_CODE (decl) == VAR_DECL && DECL_ARTIFICIAL (decl)))
1352 /* We can just emit function and compiler-generated variables
1353 statically; having multiple copies is (for the most part) only
1356 There are two correctness issues, however: the address of a
1357 template instantiation with external linkage should be the
1358 same, independent of what translation unit asks for the
1359 address, and this will not hold when we emit multiple copies of
1360 the function. However, there's little else we can do.
1362 Also, by default, the typeinfo implementation assumes that
1363 there will be only one copy of the string used as the name for
1364 each type. Therefore, if weak symbols are unavailable, the
1365 run-time library should perform a more conservative check; it
1366 should perform a string comparison, rather than an address
1368 TREE_PUBLIC (decl) = 0;
1371 /* Static data member template instantiations, however, cannot
1372 have multiple copies. */
1373 if (DECL_INITIAL (decl) == 0
1374 || DECL_INITIAL (decl) == error_mark_node)
1375 DECL_COMMON (decl) = 1;
1376 else if (EMPTY_CONSTRUCTOR_P (DECL_INITIAL (decl)))
1378 DECL_COMMON (decl) = 1;
1379 DECL_INITIAL (decl) = error_mark_node;
1381 else if (!DECL_EXPLICIT_INSTANTIATION (decl))
1383 /* We can't do anything useful; leave vars for explicit
1385 DECL_EXTERNAL (decl) = 1;
1386 DECL_NOT_REALLY_EXTERN (decl) = 0;
1390 if (DECL_LANG_SPECIFIC (decl))
1391 DECL_COMDAT (decl) = 1;
1394 /* For win32 we also want to put explicit instantiations in
1395 linkonce sections, so that they will be merged with implicit
1396 instantiations; otherwise we get duplicate symbol errors.
1397 For Darwin we do not want explicit instantiations to be
1401 maybe_make_one_only (tree decl)
1403 /* We used to say that this was not necessary on targets that support weak
1404 symbols, because the implicit instantiations will defer to the explicit
1405 one. However, that's not actually the case in SVR4; a strong definition
1406 after a weak one is an error. Also, not making explicit
1407 instantiations one_only means that we can end up with two copies of
1408 some template instantiations. */
1412 /* We can't set DECL_COMDAT on functions, or cp_finish_file will think
1413 we can get away with not emitting them if they aren't used. We need
1414 to for variables so that cp_finish_decl will update their linkage,
1415 because their DECL_INITIAL may not have been set properly yet. */
1417 if (!TARGET_WEAK_NOT_IN_ARCHIVE_TOC
1418 || (! DECL_EXPLICIT_INSTANTIATION (decl)
1419 && ! DECL_TEMPLATE_SPECIALIZATION (decl)))
1421 make_decl_one_only (decl);
1423 if (TREE_CODE (decl) == VAR_DECL)
1425 DECL_COMDAT (decl) = 1;
1426 /* Mark it needed so we don't forget to emit it. */
1427 mark_decl_referenced (decl);
1432 /* Determine whether or not we want to specifically import or export CTYPE,
1433 using various heuristics. */
1436 import_export_class (tree ctype)
1438 /* -1 for imported, 1 for exported. */
1439 int import_export = 0;
1441 /* It only makes sense to call this function at EOF. The reason is
1442 that this function looks at whether or not the first non-inline
1443 non-abstract virtual member function has been defined in this
1444 translation unit. But, we can't possibly know that until we've
1445 seen the entire translation unit. */
1446 gcc_assert (at_eof);
1448 if (CLASSTYPE_INTERFACE_KNOWN (ctype))
1451 /* If MULTIPLE_SYMBOL_SPACES is set and we saw a #pragma interface,
1452 we will have CLASSTYPE_INTERFACE_ONLY set but not
1453 CLASSTYPE_INTERFACE_KNOWN. In that case, we don't want to use this
1454 heuristic because someone will supply a #pragma implementation
1455 elsewhere, and deducing it here would produce a conflict. */
1456 if (CLASSTYPE_INTERFACE_ONLY (ctype))
1459 if (lookup_attribute ("dllimport", TYPE_ATTRIBUTES (ctype)))
1461 else if (lookup_attribute ("dllexport", TYPE_ATTRIBUTES (ctype)))
1463 else if (CLASSTYPE_IMPLICIT_INSTANTIATION (ctype)
1464 && !flag_implicit_templates)
1465 /* For a template class, without -fimplicit-templates, check the
1466 repository. If the virtual table is assigned to this
1467 translation unit, then export the class; otherwise, import
1469 import_export = repo_export_class_p (ctype) ? 1 : -1;
1470 else if (TYPE_POLYMORPHIC_P (ctype))
1472 /* The ABI specifies that the virtual table and associated
1473 information are emitted with the key method, if any. */
1474 tree method = CLASSTYPE_KEY_METHOD (ctype);
1475 /* If weak symbol support is not available, then we must be
1476 careful not to emit the vtable when the key function is
1477 inline. An inline function can be defined in multiple
1478 translation units. If we were to emit the vtable in each
1479 translation unit containing a definition, we would get
1480 multiple definition errors at link-time. */
1481 if (method && (flag_weak || ! DECL_DECLARED_INLINE_P (method)))
1482 import_export = (DECL_REALLY_EXTERN (method) ? -1 : 1);
1485 /* When MULTIPLE_SYMBOL_SPACES is set, we cannot count on seeing
1486 a definition anywhere else. */
1487 if (MULTIPLE_SYMBOL_SPACES && import_export == -1)
1490 /* Allow backends the chance to overrule the decision. */
1491 if (targetm.cxx.import_export_class)
1492 import_export = targetm.cxx.import_export_class (ctype, import_export);
1496 SET_CLASSTYPE_INTERFACE_KNOWN (ctype);
1497 CLASSTYPE_INTERFACE_ONLY (ctype) = (import_export < 0);
1501 /* Return true if VAR has already been provided to the back end; in that
1502 case VAR should not be modified further by the front end. */
1504 var_finalized_p (tree var)
1506 return cgraph_varpool_node (var)->finalized;
1509 /* DECL is a VAR_DECL or FUNCTION_DECL which, for whatever reason,
1510 must be emitted in this translation unit. Mark it as such. */
1513 mark_needed (tree decl)
1515 /* It's possible that we no longer need to set
1516 TREE_SYMBOL_REFERENCED here directly, but doing so is
1518 TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)) = 1;
1519 mark_decl_referenced (decl);
1522 /* DECL is either a FUNCTION_DECL or a VAR_DECL. This function
1523 returns true if a definition of this entity should be provided in
1524 this object file. Callers use this function to determine whether
1525 or not to let the back end know that a definition of DECL is
1526 available in this translation unit. */
1529 decl_needed_p (tree decl)
1531 gcc_assert (TREE_CODE (decl) == VAR_DECL
1532 || TREE_CODE (decl) == FUNCTION_DECL);
1533 /* This function should only be called at the end of the translation
1534 unit. We cannot be sure of whether or not something will be
1535 COMDAT until that point. */
1536 gcc_assert (at_eof);
1538 /* All entities with external linkage that are not COMDAT should be
1539 emitted; they may be referred to from other object files. */
1540 if (TREE_PUBLIC (decl) && !DECL_COMDAT (decl))
1542 /* If this entity was used, let the back-end see it; it will decide
1543 whether or not to emit it into the object file. */
1544 if (TREE_USED (decl)
1545 || (DECL_ASSEMBLER_NAME_SET_P (decl)
1546 && TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))))
1548 /* Otherwise, DECL does not need to be emitted -- yet. A subsequent
1549 reference to DECL might cause it to be emitted later. */
1553 /* If necessary, write out the vtables for the dynamic class CTYPE.
1554 Returns true if any vtables were emitted. */
1557 maybe_emit_vtables (tree ctype)
1563 /* If the vtables for this class have already been emitted there is
1564 nothing more to do. */
1565 primary_vtbl = CLASSTYPE_VTABLES (ctype);
1566 if (var_finalized_p (primary_vtbl))
1568 /* Ignore dummy vtables made by get_vtable_decl. */
1569 if (TREE_TYPE (primary_vtbl) == void_type_node)
1572 /* On some targets, we cannot determine the key method until the end
1573 of the translation unit -- which is when this function is
1575 if (!targetm.cxx.key_method_may_be_inline ())
1576 determine_key_method (ctype);
1578 /* See if any of the vtables are needed. */
1579 for (vtbl = CLASSTYPE_VTABLES (ctype); vtbl; vtbl = TREE_CHAIN (vtbl))
1581 import_export_decl (vtbl);
1582 if (DECL_NOT_REALLY_EXTERN (vtbl) && decl_needed_p (vtbl))
1587 /* If the references to this class' vtables are optimized away,
1588 still emit the appropriate debugging information. See
1590 if (DECL_COMDAT (primary_vtbl)
1591 && CLASSTYPE_DEBUG_REQUESTED (ctype))
1592 note_debug_info_needed (ctype);
1596 /* The ABI requires that we emit all of the vtables if we emit any
1598 for (vtbl = CLASSTYPE_VTABLES (ctype); vtbl; vtbl = TREE_CHAIN (vtbl))
1600 /* Mark entities references from the virtual table as used. */
1601 mark_vtable_entries (vtbl);
1603 if (TREE_TYPE (DECL_INITIAL (vtbl)) == 0)
1605 tree expr = store_init_value (vtbl, DECL_INITIAL (vtbl));
1607 /* It had better be all done at compile-time. */
1612 DECL_EXTERNAL (vtbl) = 0;
1613 rest_of_decl_compilation (vtbl, 1, 1);
1615 /* Because we're only doing syntax-checking, we'll never end up
1616 actually marking the variable as written. */
1617 if (flag_syntax_only)
1618 TREE_ASM_WRITTEN (vtbl) = 1;
1621 /* Since we're writing out the vtable here, also write the debug
1623 note_debug_info_needed (ctype);
1628 /* Like c_determine_visibility, but with additional C++-specific
1632 determine_visibility (tree decl)
1636 /* Cloned constructors and destructors get the same visibility as
1637 the underlying function. That should be set up in
1638 maybe_clone_body. */
1639 gcc_assert (!DECL_CLONED_FUNCTION_P (decl));
1641 /* Give the common code a chance to make a determination. */
1642 if (c_determine_visibility (decl))
1645 /* If DECL is a member of a class, visibility specifiers on the
1646 class can influence the visibility of the DECL. */
1647 if (DECL_CLASS_SCOPE_P (decl))
1648 class_type = DECL_CONTEXT (decl);
1649 else if (TREE_CODE (decl) == VAR_DECL
1650 && DECL_TINFO_P (decl)
1651 && CLASS_TYPE_P (TREE_TYPE (DECL_NAME (decl))))
1652 class_type = TREE_TYPE (DECL_NAME (decl));
1655 /* Virtual tables have DECL_CONTEXT set to their associated class,
1656 so they are automatically handled above. */
1657 gcc_assert (TREE_CODE (decl) != VAR_DECL
1658 || !DECL_VTABLE_OR_VTT_P (decl));
1659 /* Entities not associated with any class just get the
1660 visibility specified by their attributes. */
1664 /* By default, static data members and function members receive
1665 the visibility of their containing class. */
1668 if (TARGET_DLLIMPORT_DECL_ATTRIBUTES
1669 && lookup_attribute ("dllexport", TYPE_ATTRIBUTES (class_type)))
1671 DECL_VISIBILITY (decl) = VISIBILITY_DEFAULT;
1672 DECL_VISIBILITY_SPECIFIED (decl) = 1;
1674 else if (TREE_CODE (decl) == FUNCTION_DECL
1675 && DECL_DECLARED_INLINE_P (decl)
1676 && visibility_options.inlines_hidden)
1678 DECL_VISIBILITY (decl) = VISIBILITY_HIDDEN;
1679 DECL_VISIBILITY_SPECIFIED (decl) = 1;
1681 else if (CLASSTYPE_VISIBILITY_SPECIFIED (class_type))
1683 DECL_VISIBILITY (decl) = CLASSTYPE_VISIBILITY (class_type);
1684 DECL_VISIBILITY_SPECIFIED (decl) = 1;
1686 /* If no explicit visibility information has been provided for
1687 this class, some targets require that class data be
1689 else if (TREE_CODE (decl) == VAR_DECL
1690 && targetm.cxx.export_class_data ()
1691 && (DECL_TINFO_P (decl)
1692 || (DECL_VTABLE_OR_VTT_P (decl)
1693 /* Construction virtual tables are not emitted
1694 because they cannot be referred to from other
1695 object files; their name is not standardized by
1697 && !DECL_CONSTRUCTION_VTABLE_P (decl))))
1698 DECL_VISIBILITY (decl) = VISIBILITY_DEFAULT;
1701 DECL_VISIBILITY (decl) = CLASSTYPE_VISIBILITY (class_type);
1702 DECL_VISIBILITY_SPECIFIED (decl) = 0;
1707 /* DECL is a FUNCTION_DECL or VAR_DECL. If the object file linkage
1708 for DECL has not already been determined, do so now by setting
1709 DECL_EXTERNAL, DECL_COMDAT and other related flags. Until this
1710 function is called entities with vague linkage whose definitions
1711 are available must have TREE_PUBLIC set.
1713 If this function decides to place DECL in COMDAT, it will set
1714 appropriate flags -- but will not clear DECL_EXTERNAL. It is up to
1715 the caller to decide whether or not to clear DECL_EXTERNAL. Some
1716 callers defer that decision until it is clear that DECL is actually
1720 import_export_decl (tree decl)
1726 if (DECL_INTERFACE_KNOWN (decl))
1729 /* We cannot determine what linkage to give to an entity with vague
1730 linkage until the end of the file. For example, a virtual table
1731 for a class will be defined if and only if the key method is
1732 defined in this translation unit. As a further example, consider
1733 that when compiling a translation unit that uses PCH file with
1734 "-frepo" it would be incorrect to make decisions about what
1735 entities to emit when building the PCH; those decisions must be
1736 delayed until the repository information has been processed. */
1737 gcc_assert (at_eof);
1738 /* Object file linkage for explicit instantiations is handled in
1739 mark_decl_instantiated. For static variables in functions with
1740 vague linkage, maybe_commonize_var is used.
1742 Therefore, the only declarations that should be provided to this
1743 function are those with external linkage that:
1745 * implicit instantiations of function templates
1749 * implicit instantiations of static data members of class
1756 Furthermore, all entities that reach this point must have a
1757 definition available in this translation unit.
1759 The following assertions check these conditions. */
1760 gcc_assert (TREE_CODE (decl) == FUNCTION_DECL
1761 || TREE_CODE (decl) == VAR_DECL);
1762 /* Any code that creates entities with TREE_PUBLIC cleared should
1763 also set DECL_INTERFACE_KNOWN. */
1764 gcc_assert (TREE_PUBLIC (decl));
1765 if (TREE_CODE (decl) == FUNCTION_DECL)
1766 gcc_assert (DECL_IMPLICIT_INSTANTIATION (decl)
1767 || DECL_FRIEND_PSEUDO_TEMPLATE_INSTANTIATION (decl)
1768 || DECL_DECLARED_INLINE_P (decl));
1770 gcc_assert (DECL_IMPLICIT_INSTANTIATION (decl)
1771 || DECL_VTABLE_OR_VTT_P (decl)
1772 || DECL_TINFO_P (decl));
1773 /* Check that a definition of DECL is available in this translation
1775 gcc_assert (!DECL_REALLY_EXTERN (decl));
1777 /* Assume that DECL will not have COMDAT linkage. */
1779 /* Assume that DECL will not be imported into this translation
1783 /* See if the repository tells us whether or not to emit DECL in
1784 this translation unit. */
1785 emit_p = repo_emit_p (decl);
1788 else if (emit_p == 1)
1790 /* The repository indicates that this entity should be defined
1791 here. Make sure the back end honors that request. */
1792 if (TREE_CODE (decl) == VAR_DECL)
1794 else if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (decl)
1795 || DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P (decl))
1798 FOR_EACH_CLONE (clone, decl)
1799 mark_needed (clone);
1803 /* Output the definition as an ordinary strong definition. */
1804 DECL_EXTERNAL (decl) = 0;
1805 DECL_INTERFACE_KNOWN (decl) = 1;
1810 /* We have already decided what to do with this DECL; there is no
1811 need to check anything further. */
1813 else if (TREE_CODE (decl) == VAR_DECL && DECL_VTABLE_OR_VTT_P (decl))
1815 tree type = DECL_CONTEXT (decl);
1816 import_export_class (type);
1817 if (TYPE_FOR_JAVA (type))
1819 else if (CLASSTYPE_INTERFACE_KNOWN (type)
1820 && CLASSTYPE_INTERFACE_ONLY (type))
1822 else if (TARGET_WEAK_NOT_IN_ARCHIVE_TOC
1823 && !CLASSTYPE_USE_TEMPLATE (type)
1824 && CLASSTYPE_KEY_METHOD (type)
1825 && !DECL_DECLARED_INLINE_P (CLASSTYPE_KEY_METHOD (type)))
1826 /* The ABI requires that all virtual tables be emitted with
1827 COMDAT linkage. However, on systems where COMDAT symbols
1828 don't show up in the table of contents for a static
1829 archive, the linker will report errors about undefined
1830 symbols because it will not see the virtual table
1831 definition. Therefore, in the case that we know that the
1832 virtual table will be emitted in only one translation
1833 unit, we make the virtual table an ordinary definition
1834 with external linkage. */
1835 DECL_EXTERNAL (decl) = 0;
1836 else if (CLASSTYPE_INTERFACE_KNOWN (type))
1838 /* TYPE is being exported from this translation unit, so DECL
1839 should be defined here. The ABI requires COMDAT
1840 linkage. Normally, we only emit COMDAT things when they
1841 are needed; make sure that we realize that this entity is
1846 else if (!flag_implicit_templates
1847 && CLASSTYPE_IMPLICIT_INSTANTIATION (type))
1852 else if (TREE_CODE (decl) == VAR_DECL && DECL_TINFO_P (decl))
1854 tree type = TREE_TYPE (DECL_NAME (decl));
1855 if (CLASS_TYPE_P (type))
1857 import_export_class (type);
1858 if (CLASSTYPE_INTERFACE_KNOWN (type)
1859 && TYPE_POLYMORPHIC_P (type)
1860 && CLASSTYPE_INTERFACE_ONLY (type)
1861 /* If -fno-rtti was specified, then we cannot be sure
1862 that RTTI information will be emitted with the
1863 virtual table of the class, so we must emit it
1864 wherever it is used. */
1870 if (CLASSTYPE_INTERFACE_KNOWN (type)
1871 && !CLASSTYPE_INTERFACE_ONLY (type))
1878 else if (DECL_TEMPLATE_INSTANTIATION (decl)
1879 || DECL_FRIEND_PSEUDO_TEMPLATE_INSTANTIATION (decl))
1881 /* DECL is an implicit instantiation of a function or static
1883 if (flag_implicit_templates
1884 || (flag_implicit_inline_templates
1885 && TREE_CODE (decl) == FUNCTION_DECL
1886 && DECL_DECLARED_INLINE_P (decl)))
1889 /* If we are not implicitly generating templates, then mark
1890 this entity as undefined in this translation unit. */
1893 else if (DECL_FUNCTION_MEMBER_P (decl))
1895 if (!DECL_DECLARED_INLINE_P (decl))
1897 tree ctype = DECL_CONTEXT (decl);
1898 import_export_class (ctype);
1899 if (CLASSTYPE_INTERFACE_KNOWN (ctype))
1901 DECL_NOT_REALLY_EXTERN (decl)
1902 = ! (CLASSTYPE_INTERFACE_ONLY (ctype)
1903 || (DECL_DECLARED_INLINE_P (decl)
1904 && ! flag_implement_inlines
1905 && !DECL_VINDEX (decl)));
1907 if (!DECL_NOT_REALLY_EXTERN (decl))
1908 DECL_EXTERNAL (decl) = 1;
1910 /* Always make artificials weak. */
1911 if (DECL_ARTIFICIAL (decl) && flag_weak)
1914 maybe_make_one_only (decl);
1925 /* If we are importing DECL into this translation unit, mark is
1926 an undefined here. */
1927 DECL_EXTERNAL (decl) = 1;
1928 DECL_NOT_REALLY_EXTERN (decl) = 0;
1932 /* If we decided to put DECL in COMDAT, mark it accordingly at
1934 comdat_linkage (decl);
1937 DECL_INTERFACE_KNOWN (decl) = 1;
1940 /* Return an expression that performs the destruction of DECL, which
1941 must be a VAR_DECL whose type has a non-trivial destructor, or is
1942 an array whose (innermost) elements have a non-trivial destructor. */
1945 build_cleanup (tree decl)
1948 tree type = TREE_TYPE (decl);
1950 /* This function should only be called for declarations that really
1951 require cleanups. */
1952 gcc_assert (!TYPE_HAS_TRIVIAL_DESTRUCTOR (type));
1954 /* Treat all objects with destructors as used; the destructor may do
1955 something substantive. */
1958 if (TREE_CODE (type) == ARRAY_TYPE)
1962 cxx_mark_addressable (decl);
1963 temp = build1 (ADDR_EXPR, build_pointer_type (type), decl);
1965 temp = build_delete (TREE_TYPE (temp), temp,
1966 sfk_complete_destructor,
1967 LOOKUP_NORMAL|LOOKUP_NONVIRTUAL|LOOKUP_DESTRUCTOR, 0);
1971 /* Returns the initialization guard variable for the variable DECL,
1972 which has static storage duration. */
1975 get_guard (tree decl)
1980 sname = mangle_guard_variable (decl);
1981 guard = IDENTIFIER_GLOBAL_VALUE (sname);
1986 /* We use a type that is big enough to contain a mutex as well
1987 as an integer counter. */
1988 guard_type = targetm.cxx.guard_type ();
1989 guard = build_decl (VAR_DECL, sname, guard_type);
1991 /* The guard should have the same linkage as what it guards. */
1992 TREE_PUBLIC (guard) = TREE_PUBLIC (decl);
1993 TREE_STATIC (guard) = TREE_STATIC (decl);
1994 DECL_COMMON (guard) = DECL_COMMON (decl);
1995 DECL_ONE_ONLY (guard) = DECL_ONE_ONLY (decl);
1996 if (TREE_PUBLIC (decl))
1997 DECL_WEAK (guard) = DECL_WEAK (decl);
1999 DECL_ARTIFICIAL (guard) = 1;
2000 TREE_USED (guard) = 1;
2001 pushdecl_top_level_and_finish (guard, NULL_TREE);
2006 /* Return those bits of the GUARD variable that should be set when the
2007 guarded entity is actually initialized. */
2010 get_guard_bits (tree guard)
2012 if (!targetm.cxx.guard_mask_bit ())
2014 /* We only set the first byte of the guard, in order to leave room
2015 for a mutex in the high-order bits. */
2016 guard = build1 (ADDR_EXPR,
2017 build_pointer_type (TREE_TYPE (guard)),
2019 guard = build1 (NOP_EXPR,
2020 build_pointer_type (char_type_node),
2022 guard = build1 (INDIRECT_REF, char_type_node, guard);
2028 /* Return an expression which determines whether or not the GUARD
2029 variable has already been initialized. */
2032 get_guard_cond (tree guard)
2036 /* Check to see if the GUARD is zero. */
2037 guard = get_guard_bits (guard);
2039 /* Mask off all but the low bit. */
2040 if (targetm.cxx.guard_mask_bit ())
2042 guard_value = integer_one_node;
2043 if (!same_type_p (TREE_TYPE (guard_value), TREE_TYPE (guard)))
2044 guard_value = convert (TREE_TYPE (guard), guard_value);
2045 guard = cp_build_binary_op (BIT_AND_EXPR, guard, guard_value);
2048 guard_value = integer_zero_node;
2049 if (!same_type_p (TREE_TYPE (guard_value), TREE_TYPE (guard)))
2050 guard_value = convert (TREE_TYPE (guard), guard_value);
2051 return cp_build_binary_op (EQ_EXPR, guard, guard_value);
2054 /* Return an expression which sets the GUARD variable, indicating that
2055 the variable being guarded has been initialized. */
2058 set_guard (tree guard)
2062 /* Set the GUARD to one. */
2063 guard = get_guard_bits (guard);
2064 guard_init = integer_one_node;
2065 if (!same_type_p (TREE_TYPE (guard_init), TREE_TYPE (guard)))
2066 guard_init = convert (TREE_TYPE (guard), guard_init);
2067 return build_modify_expr (guard, NOP_EXPR, guard_init);
2070 /* Start the process of running a particular set of global constructors
2071 or destructors. Subroutine of do_[cd]tors. */
2074 start_objects (int method_type, int initp)
2080 /* Make ctor or dtor function. METHOD_TYPE may be 'I' or 'D'. */
2082 if (initp != DEFAULT_INIT_PRIORITY)
2092 sprintf (type, "%c%c%.5u", method_type, joiner, initp);
2095 sprintf (type, "%c", method_type);
2097 fndecl = build_lang_decl (FUNCTION_DECL,
2098 get_file_function_name_long (type),
2099 build_function_type (void_type_node,
2101 start_preparsed_function (fndecl, /*attrs=*/NULL_TREE, SF_PRE_PARSED);
2103 /* It can be a static function as long as collect2 does not have
2104 to scan the object file to find its ctor/dtor routine. */
2105 TREE_PUBLIC (current_function_decl) = ! targetm.have_ctors_dtors;
2107 /* Mark this declaration as used to avoid spurious warnings. */
2108 TREE_USED (current_function_decl) = 1;
2110 /* Mark this function as a global constructor or destructor. */
2111 if (method_type == 'I')
2112 DECL_GLOBAL_CTOR_P (current_function_decl) = 1;
2114 DECL_GLOBAL_DTOR_P (current_function_decl) = 1;
2115 DECL_LANG_SPECIFIC (current_function_decl)->decl_flags.u2sel = 1;
2117 body = begin_compound_stmt (BCS_FN_BODY);
2119 /* We cannot allow these functions to be elided, even if they do not
2120 have external linkage. And, there's no point in deferring
2121 compilation of thes functions; they're all going to have to be
2123 DECL_INLINE (current_function_decl) = 0;
2124 DECL_UNINLINABLE (current_function_decl) = 1;
2129 /* Finish the process of running a particular set of global constructors
2130 or destructors. Subroutine of do_[cd]tors. */
2133 finish_objects (int method_type, int initp, tree body)
2138 finish_compound_stmt (body);
2139 fn = finish_function (0);
2140 expand_or_defer_fn (fn);
2142 /* When only doing semantic analysis, and no RTL generation, we
2143 can't call functions that directly emit assembly code; there is
2144 no assembly file in which to put the code. */
2145 if (flag_syntax_only)
2148 if (targetm.have_ctors_dtors)
2150 rtx fnsym = XEXP (DECL_RTL (fn), 0);
2151 if (method_type == 'I')
2152 (* targetm.asm_out.constructor) (fnsym, initp);
2154 (* targetm.asm_out.destructor) (fnsym, initp);
2158 /* The names of the parameters to the function created to handle
2159 initializations and destructions for objects with static storage
2161 #define INITIALIZE_P_IDENTIFIER "__initialize_p"
2162 #define PRIORITY_IDENTIFIER "__priority"
2164 /* The name of the function we create to handle initializations and
2165 destructions for objects with static storage duration. */
2166 #define SSDF_IDENTIFIER "__static_initialization_and_destruction"
2168 /* The declaration for the __INITIALIZE_P argument. */
2169 static GTY(()) tree initialize_p_decl;
2171 /* The declaration for the __PRIORITY argument. */
2172 static GTY(()) tree priority_decl;
2174 /* The declaration for the static storage duration function. */
2175 static GTY(()) tree ssdf_decl;
2177 /* All the static storage duration functions created in this
2178 translation unit. */
2179 static GTY(()) varray_type ssdf_decls;
2181 /* A map from priority levels to information about that priority
2182 level. There may be many such levels, so efficient lookup is
2184 static splay_tree priority_info_map;
2186 /* Begins the generation of the function that will handle all
2187 initialization and destruction of objects with static storage
2188 duration. The function generated takes two parameters of type
2189 `int': __INITIALIZE_P and __PRIORITY. If __INITIALIZE_P is
2190 nonzero, it performs initializations. Otherwise, it performs
2191 destructions. It only performs those initializations or
2192 destructions with the indicated __PRIORITY. The generated function
2195 It is assumed that this function will only be called once per
2196 translation unit. */
2199 start_static_storage_duration_function (unsigned count)
2204 char id[sizeof (SSDF_IDENTIFIER) + 1 /* '\0' */ + 32];
2206 /* Create the identifier for this function. It will be of the form
2207 SSDF_IDENTIFIER_<number>. */
2208 sprintf (id, "%s_%u", SSDF_IDENTIFIER, count);
2210 /* Create the parameters. */
2211 parm_types = void_list_node;
2212 parm_types = tree_cons (NULL_TREE, integer_type_node, parm_types);
2213 parm_types = tree_cons (NULL_TREE, integer_type_node, parm_types);
2214 type = build_function_type (void_type_node, parm_types);
2216 /* Create the FUNCTION_DECL itself. */
2217 ssdf_decl = build_lang_decl (FUNCTION_DECL,
2218 get_identifier (id),
2220 TREE_PUBLIC (ssdf_decl) = 0;
2221 DECL_ARTIFICIAL (ssdf_decl) = 1;
2223 /* Put this function in the list of functions to be called from the
2224 static constructors and destructors. */
2227 VARRAY_TREE_INIT (ssdf_decls, 32, "ssdf_decls");
2229 /* Take this opportunity to initialize the map from priority
2230 numbers to information about that priority level. */
2231 priority_info_map = splay_tree_new (splay_tree_compare_ints,
2232 /*delete_key_fn=*/0,
2233 /*delete_value_fn=*/
2234 (splay_tree_delete_value_fn) &free);
2236 /* We always need to generate functions for the
2237 DEFAULT_INIT_PRIORITY so enter it now. That way when we walk
2238 priorities later, we'll be sure to find the
2239 DEFAULT_INIT_PRIORITY. */
2240 get_priority_info (DEFAULT_INIT_PRIORITY);
2243 VARRAY_PUSH_TREE (ssdf_decls, ssdf_decl);
2245 /* Create the argument list. */
2246 initialize_p_decl = cp_build_parm_decl
2247 (get_identifier (INITIALIZE_P_IDENTIFIER), integer_type_node);
2248 DECL_CONTEXT (initialize_p_decl) = ssdf_decl;
2249 TREE_USED (initialize_p_decl) = 1;
2250 priority_decl = cp_build_parm_decl
2251 (get_identifier (PRIORITY_IDENTIFIER), integer_type_node);
2252 DECL_CONTEXT (priority_decl) = ssdf_decl;
2253 TREE_USED (priority_decl) = 1;
2255 TREE_CHAIN (initialize_p_decl) = priority_decl;
2256 DECL_ARGUMENTS (ssdf_decl) = initialize_p_decl;
2258 /* Put the function in the global scope. */
2259 pushdecl (ssdf_decl);
2261 /* Start the function itself. This is equivalent to declaring the
2264 static void __ssdf (int __initialize_p, init __priority_p);
2266 It is static because we only need to call this function from the
2267 various constructor and destructor functions for this module. */
2268 start_preparsed_function (ssdf_decl,
2269 /*attrs=*/NULL_TREE,
2272 /* Set up the scope of the outermost block in the function. */
2273 body = begin_compound_stmt (BCS_FN_BODY);
2275 /* This function must not be deferred because we are depending on
2276 its compilation to tell us what is TREE_SYMBOL_REFERENCED. */
2277 DECL_INLINE (ssdf_decl) = 0;
2278 DECL_UNINLINABLE (ssdf_decl) = 1;
2283 /* Finish the generation of the function which performs initialization
2284 and destruction of objects with static storage duration. After
2285 this point, no more such objects can be created. */
2288 finish_static_storage_duration_function (tree body)
2290 /* Close out the function. */
2291 finish_compound_stmt (body);
2292 expand_or_defer_fn (finish_function (0));
2295 /* Return the information about the indicated PRIORITY level. If no
2296 code to handle this level has yet been generated, generate the
2297 appropriate prologue. */
2299 static priority_info
2300 get_priority_info (int priority)
2305 n = splay_tree_lookup (priority_info_map,
2306 (splay_tree_key) priority);
2309 /* Create a new priority information structure, and insert it
2311 pi = xmalloc (sizeof (struct priority_info_s));
2312 pi->initializations_p = 0;
2313 pi->destructions_p = 0;
2314 splay_tree_insert (priority_info_map,
2315 (splay_tree_key) priority,
2316 (splay_tree_value) pi);
2319 pi = (priority_info) n->value;
2324 /* Set up to handle the initialization or destruction of DECL. If
2325 INITP is nonzero, we are initializing the variable. Otherwise, we
2326 are destroying it. */
2329 start_static_initialization_or_destruction (tree decl, int initp)
2331 tree guard_if_stmt = NULL_TREE;
2338 /* Figure out the priority for this declaration. */
2339 priority = DECL_INIT_PRIORITY (decl);
2341 priority = DEFAULT_INIT_PRIORITY;
2343 /* Remember that we had an initialization or finalization at this
2345 pi = get_priority_info (priority);
2347 pi->initializations_p = 1;
2349 pi->destructions_p = 1;
2351 /* Trick the compiler into thinking we are at the file and line
2352 where DECL was declared so that error-messages make sense, and so
2353 that the debugger will show somewhat sensible file and line
2355 input_location = DECL_SOURCE_LOCATION (decl);
2361 Access control for implicit calls to the constructors,
2362 the conversion functions, or the destructor called to
2363 create and destroy a static data member is performed as
2364 if these calls appeared in the scope of the member's
2367 we pretend we are in a static member function of the class of
2368 which the DECL is a member. */
2369 if (member_p (decl))
2371 DECL_CONTEXT (current_function_decl) = DECL_CONTEXT (decl);
2372 DECL_STATIC_FUNCTION_P (current_function_decl) = 1;
2375 /* Conditionalize this initialization on being in the right priority
2376 and being initializing/finalizing appropriately. */
2377 guard_if_stmt = begin_if_stmt ();
2378 cond = cp_build_binary_op (EQ_EXPR,
2380 build_int_cst (NULL_TREE, priority));
2381 init_cond = initp ? integer_one_node : integer_zero_node;
2382 init_cond = cp_build_binary_op (EQ_EXPR,
2385 cond = cp_build_binary_op (TRUTH_ANDIF_EXPR, cond, init_cond);
2387 /* Assume we don't need a guard. */
2389 /* We need a guard if this is an object with external linkage that
2390 might be initialized in more than one place. (For example, a
2391 static data member of a template, when the data member requires
2393 if (TREE_PUBLIC (decl) && (DECL_COMMON (decl)
2394 || DECL_ONE_ONLY (decl)
2395 || DECL_WEAK (decl)))
2399 guard = get_guard (decl);
2401 /* When using __cxa_atexit, we just check the GUARD as we would
2402 for a local static. */
2403 if (flag_use_cxa_atexit)
2405 /* When using __cxa_atexit, we never try to destroy
2406 anything from a static destructor. */
2408 guard_cond = get_guard_cond (guard);
2410 /* If we don't have __cxa_atexit, then we will be running
2411 destructors from .fini sections, or their equivalents. So,
2412 we need to know how many times we've tried to initialize this
2413 object. We do initializations only if the GUARD is zero,
2414 i.e., if we are the first to initialize the variable. We do
2415 destructions only if the GUARD is one, i.e., if we are the
2416 last to destroy the variable. */
2419 = cp_build_binary_op (EQ_EXPR,
2420 build_unary_op (PREINCREMENT_EXPR,
2426 = cp_build_binary_op (EQ_EXPR,
2427 build_unary_op (PREDECREMENT_EXPR,
2432 cond = cp_build_binary_op (TRUTH_ANDIF_EXPR, cond, guard_cond);
2435 finish_if_stmt_cond (cond, guard_if_stmt);
2437 /* If we're using __cxa_atexit, we have not already set the GUARD,
2438 so we must do so now. */
2439 if (guard && initp && flag_use_cxa_atexit)
2440 finish_expr_stmt (set_guard (guard));
2442 return guard_if_stmt;
2445 /* We've just finished generating code to do an initialization or
2446 finalization. GUARD_IF_STMT is the if-statement we used to guard
2447 the initialization. */
2450 finish_static_initialization_or_destruction (tree guard_if_stmt)
2452 finish_then_clause (guard_if_stmt);
2453 finish_if_stmt (guard_if_stmt);
2455 /* Now that we're done with DECL we don't need to pretend to be a
2456 member of its class any longer. */
2457 DECL_CONTEXT (current_function_decl) = NULL_TREE;
2458 DECL_STATIC_FUNCTION_P (current_function_decl) = 0;
2461 /* Generate code to do the initialization of DECL, a VAR_DECL with
2462 static storage duration. The initialization is INIT. */
2465 do_static_initialization (tree decl, tree init)
2469 /* Set up for the initialization. */
2471 = start_static_initialization_or_destruction (decl,
2474 /* Perform the initialization. */
2476 finish_expr_stmt (init);
2478 /* If we're using __cxa_atexit, register a a function that calls the
2479 destructor for the object. */
2480 if (flag_use_cxa_atexit)
2481 finish_expr_stmt (register_dtor_fn (decl));
2484 finish_static_initialization_or_destruction (guard_if_stmt);
2487 /* Generate code to do the static destruction of DECL. If DECL may be
2488 initialized more than once in different object files, GUARD is the
2489 guard variable to check. PRIORITY is the priority for the
2493 do_static_destruction (tree decl)
2497 /* If we're using __cxa_atexit, then destructors are registered
2498 immediately after objects are initialized. */
2499 gcc_assert (!flag_use_cxa_atexit);
2501 /* If we don't need a destructor, there's nothing to do. */
2502 if (TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
2505 /* Actually do the destruction. */
2506 guard_if_stmt = start_static_initialization_or_destruction (decl,
2508 finish_expr_stmt (build_cleanup (decl));
2509 finish_static_initialization_or_destruction (guard_if_stmt);
2512 /* VARS is a list of variables with static storage duration which may
2513 need initialization and/or finalization. Remove those variables
2514 that don't really need to be initialized or finalized, and return
2515 the resulting list. The order in which the variables appear in
2516 VARS is in reverse order of the order in which they should actually
2517 be initialized. The list we return is in the unreversed order;
2518 i.e., the first variable should be initialized first. */
2521 prune_vars_needing_no_initialization (tree *vars)
2524 tree result = NULL_TREE;
2529 tree decl = TREE_VALUE (t);
2530 tree init = TREE_PURPOSE (t);
2532 /* Deal gracefully with error. */
2533 if (decl == error_mark_node)
2535 var = &TREE_CHAIN (t);
2539 /* The only things that can be initialized are variables. */
2540 gcc_assert (TREE_CODE (decl) == VAR_DECL);
2542 /* If this object is not defined, we don't need to do anything
2544 if (DECL_EXTERNAL (decl))
2546 var = &TREE_CHAIN (t);
2550 /* Also, if the initializer already contains errors, we can bail
2552 if (init && TREE_CODE (init) == TREE_LIST
2553 && value_member (error_mark_node, init))
2555 var = &TREE_CHAIN (t);
2559 /* This variable is going to need initialization and/or
2560 finalization, so we add it to the list. */
2561 *var = TREE_CHAIN (t);
2562 TREE_CHAIN (t) = result;
2569 /* Make sure we have told the back end about all the variables in
2573 write_out_vars (tree vars)
2577 for (v = vars; v; v = TREE_CHAIN (v))
2579 tree var = TREE_VALUE (v);
2580 if (!var_finalized_p (var))
2582 import_export_decl (var);
2583 rest_of_decl_compilation (var, 1, 1);
2588 /* Generate a static constructor (if CONSTRUCTOR_P) or destructor
2589 (otherwise) that will initialize all gobal objects with static
2590 storage duration having the indicated PRIORITY. */
2593 generate_ctor_or_dtor_function (bool constructor_p, int priority,
2602 input_location = *locus;
2603 #ifdef USE_MAPPED_LOCATION
2609 /* We use `I' to indicate initialization and `D' to indicate
2611 function_key = constructor_p ? 'I' : 'D';
2613 /* We emit the function lazily, to avoid generating empty
2614 global constructors and destructors. */
2617 /* Call the static storage duration function with appropriate
2620 for (i = 0; i < ssdf_decls->elements_used; ++i)
2622 fndecl = VARRAY_TREE (ssdf_decls, i);
2624 /* Calls to pure or const functions will expand to nothing. */
2625 if (! (flags_from_decl_or_type (fndecl) & (ECF_CONST | ECF_PURE)))
2628 body = start_objects (function_key, priority);
2630 arguments = tree_cons (NULL_TREE,
2631 build_int_cst (NULL_TREE, priority),
2633 arguments = tree_cons (NULL_TREE,
2634 build_int_cst (NULL_TREE, constructor_p),
2636 finish_expr_stmt (build_function_call (fndecl, arguments));
2640 /* If we're generating code for the DEFAULT_INIT_PRIORITY, throw in
2641 calls to any functions marked with attributes indicating that
2642 they should be called at initialization- or destruction-time. */
2643 if (priority == DEFAULT_INIT_PRIORITY)
2647 for (fns = constructor_p ? static_ctors : static_dtors;
2649 fns = TREE_CHAIN (fns))
2651 fndecl = TREE_VALUE (fns);
2653 /* Calls to pure/const functions will expand to nothing. */
2654 if (! (flags_from_decl_or_type (fndecl) & (ECF_CONST | ECF_PURE)))
2657 body = start_objects (function_key, priority);
2658 finish_expr_stmt (build_function_call (fndecl, NULL_TREE));
2663 /* Close out the function. */
2665 finish_objects (function_key, priority, body);
2668 /* Generate constructor and destructor functions for the priority
2672 generate_ctor_and_dtor_functions_for_priority (splay_tree_node n, void * data)
2674 location_t *locus = data;
2675 int priority = (int) n->key;
2676 priority_info pi = (priority_info) n->value;
2678 /* Generate the functions themselves, but only if they are really
2680 if (pi->initializations_p
2681 || (priority == DEFAULT_INIT_PRIORITY && static_ctors))
2682 generate_ctor_or_dtor_function (/*constructor_p=*/true, priority, locus);
2683 if (pi->destructions_p
2684 || (priority == DEFAULT_INIT_PRIORITY && static_dtors))
2685 generate_ctor_or_dtor_function (/*constructor_p=*/false, priority, locus);
2687 /* Keep iterating. */
2691 /* Called via LANGHOOK_CALLGRAPH_ANALYZE_EXPR. It is supposed to mark
2692 decls referenced from frontend specific constructs; it will be called
2693 only for language-specific tree nodes.
2695 Here we must deal with member pointers. */
2698 cxx_callgraph_analyze_expr (tree *tp, int *walk_subtrees ATTRIBUTE_UNUSED,
2699 tree from ATTRIBUTE_UNUSED)
2703 switch (TREE_CODE (t))
2706 if (TYPE_PTRMEMFUNC_P (TREE_TYPE (t)))
2707 cgraph_mark_needed_node (cgraph_node (PTRMEM_CST_MEMBER (t)));
2710 if (TREE_CODE (BASELINK_FUNCTIONS (t)) == FUNCTION_DECL)
2711 cgraph_mark_needed_node (cgraph_node (BASELINK_FUNCTIONS (t)));
2714 if (DECL_VTABLE_OR_VTT_P (t))
2716 /* The ABI requires that all virtual tables be emitted
2717 whenever one of them is. */
2719 for (vtbl = CLASSTYPE_VTABLES (DECL_CONTEXT (t));
2721 vtbl = TREE_CHAIN (vtbl))
2722 mark_decl_referenced (vtbl);
2724 else if (DECL_CONTEXT (t)
2725 && TREE_CODE (DECL_CONTEXT (t)) == FUNCTION_DECL)
2726 /* If we need a static variable in a function, then we
2727 need the containing function. */
2728 mark_decl_referenced (DECL_CONTEXT (t));
2737 /* This routine is called from the last rule in yyparse ().
2738 Its job is to create all the code needed to initialize and
2739 destroy the global aggregates. We do the destruction
2740 first, since that way we only need to reverse the decls once. */
2743 cp_finish_file (void)
2749 unsigned ssdf_count = 0;
2752 locus = input_location;
2755 /* Bad parse errors. Just forget about it. */
2756 if (! global_bindings_p () || current_class_type || decl_namespace_list)
2760 c_common_write_pch ();
2762 #ifdef USE_MAPPED_LOCATION
2765 /* Otherwise, GDB can get confused, because in only knows
2766 about source for LINENO-1 lines. */
2770 /* We now have to write out all the stuff we put off writing out.
2773 o Template specializations that we have not yet instantiated,
2774 but which are needed.
2775 o Initialization and destruction for non-local objects with
2776 static storage duration. (Local objects with static storage
2777 duration are initialized when their scope is first entered,
2778 and are cleaned up via atexit.)
2779 o Virtual function tables.
2781 All of these may cause others to be needed. For example,
2782 instantiating one function may cause another to be needed, and
2783 generating the initializer for an object may cause templates to be
2784 instantiated, etc., etc. */
2786 timevar_push (TV_VARCONST);
2788 emit_support_tinfos ();
2796 /* If there are templates that we've put off instantiating, do
2798 instantiate_pending_templates (retries);
2801 /* Write out virtual tables as required. Note that writing out
2802 the virtual table for a template class may cause the
2803 instantiation of members of that class. If we write out
2804 vtables then we remove the class from our list so we don't
2805 have to look at it again. */
2807 while (keyed_classes != NULL_TREE
2808 && maybe_emit_vtables (TREE_VALUE (keyed_classes)))
2811 keyed_classes = TREE_CHAIN (keyed_classes);
2817 tree next = TREE_CHAIN (t);
2821 if (maybe_emit_vtables (TREE_VALUE (next)))
2824 TREE_CHAIN (t) = TREE_CHAIN (next);
2829 next = TREE_CHAIN (t);
2833 /* Write out needed type info variables. We have to be careful
2834 looping through unemitted decls, because emit_tinfo_decl may
2835 cause other variables to be needed. New elements will be
2836 appended, and we remove from the vector those that actually
2838 for (i = VEC_length (tree, unemitted_tinfo_decls);
2839 VEC_iterate (tree, unemitted_tinfo_decls, --i, t);)
2840 if (emit_tinfo_decl (t))
2843 VEC_unordered_remove (tree, unemitted_tinfo_decls, i);
2846 /* The list of objects with static storage duration is built up
2847 in reverse order. We clear STATIC_AGGREGATES so that any new
2848 aggregates added during the initialization of these will be
2849 initialized in the correct order when we next come around the
2851 vars = prune_vars_needing_no_initialization (&static_aggregates);
2857 /* We need to start a new initialization function each time
2858 through the loop. That's because we need to know which
2859 vtables have been referenced, and TREE_SYMBOL_REFERENCED
2860 isn't computed until a function is finished, and written
2861 out. That's a deficiency in the back-end. When this is
2862 fixed, these initialization functions could all become
2863 inline, with resulting performance improvements. */
2866 /* Set the line and file, so that it is obviously not from
2868 input_location = locus;
2869 ssdf_body = start_static_storage_duration_function (ssdf_count);
2871 /* Make sure the back end knows about all the variables. */
2872 write_out_vars (vars);
2874 /* First generate code to do all the initializations. */
2875 for (v = vars; v; v = TREE_CHAIN (v))
2876 do_static_initialization (TREE_VALUE (v),
2879 /* Then, generate code to do all the destructions. Do these
2880 in reverse order so that the most recently constructed
2881 variable is the first destroyed. If we're using
2882 __cxa_atexit, then we don't need to do this; functions
2883 were registered at initialization time to destroy the
2885 if (!flag_use_cxa_atexit)
2887 vars = nreverse (vars);
2888 for (v = vars; v; v = TREE_CHAIN (v))
2889 do_static_destruction (TREE_VALUE (v));
2894 /* Finish up the static storage duration function for this
2896 input_location = locus;
2897 finish_static_storage_duration_function (ssdf_body);
2899 /* All those initializations and finalizations might cause
2900 us to need more inline functions, more template
2901 instantiations, etc. */
2904 #ifdef USE_MAPPED_LOCATION
2911 /* Go through the set of inline functions whose bodies have not
2912 been emitted yet. If out-of-line copies of these functions
2913 are required, emit them. */
2914 for (i = 0; i < deferred_fns_used; ++i)
2916 tree decl = VARRAY_TREE (deferred_fns, i);
2918 /* Does it need synthesizing? */
2919 if (DECL_ARTIFICIAL (decl) && ! DECL_INITIAL (decl)
2920 && (! DECL_REALLY_EXTERN (decl) || DECL_INLINE (decl)))
2922 /* Even though we're already at the top-level, we push
2923 there again. That way, when we pop back a few lines
2924 hence, all of our state is restored. Otherwise,
2925 finish_function doesn't clean things up, and we end
2926 up with CURRENT_FUNCTION_DECL set. */
2927 push_to_top_level ();
2928 synthesize_method (decl);
2929 pop_from_top_level ();
2933 if (!DECL_SAVED_TREE (decl))
2936 import_export_decl (decl);
2938 /* We lie to the back-end, pretending that some functions
2939 are not defined when they really are. This keeps these
2940 functions from being put out unnecessarily. But, we must
2941 stop lying when the functions are referenced, or if they
2942 are not comdat since they need to be put out now. This
2943 is done in a separate for cycle, because if some deferred
2944 function is contained in another deferred function later
2945 in deferred_fns varray, rest_of_compilation would skip
2946 this function and we really cannot expand the same
2948 if (DECL_NOT_REALLY_EXTERN (decl)
2949 && DECL_INITIAL (decl)
2950 && decl_needed_p (decl))
2951 DECL_EXTERNAL (decl) = 0;
2953 /* If we're going to need to write this function out, and
2954 there's already a body for it, create RTL for it now.
2955 (There might be no body if this is a method we haven't
2956 gotten around to synthesizing yet.) */
2957 if (!DECL_EXTERNAL (decl)
2958 && decl_needed_p (decl)
2959 && !TREE_ASM_WRITTEN (decl)
2960 && !cgraph_node (decl)->local.finalized)
2962 /* We will output the function; no longer consider it in this
2964 DECL_DEFER_OUTPUT (decl) = 0;
2965 /* Generate RTL for this function now that we know we
2967 expand_or_defer_fn (decl);
2968 /* If we're compiling -fsyntax-only pretend that this
2969 function has been written out so that we don't try to
2971 if (flag_syntax_only)
2972 TREE_ASM_WRITTEN (decl) = 1;
2977 if (walk_namespaces (wrapup_globals_for_namespace, /*data=*/0))
2980 /* Static data members are just like namespace-scope globals. */
2981 for (i = 0; i < pending_statics_used; ++i)
2983 tree decl = VARRAY_TREE (pending_statics, i);
2984 if (var_finalized_p (decl) || DECL_REALLY_EXTERN (decl))
2986 import_export_decl (decl);
2987 /* If this static data member is needed, provide it to the
2989 if (DECL_NOT_REALLY_EXTERN (decl) && decl_needed_p (decl))
2990 DECL_EXTERNAL (decl) = 0;
2993 && wrapup_global_declarations (&VARRAY_TREE (pending_statics, 0),
2994 pending_statics_used))
2997 /* Ask the back end to emit functions and variables that are
2998 enqueued. These emissions may result in marking more entities
3000 if (cgraph_assemble_pending_functions ())
3002 if (cgraph_varpool_assemble_pending_decls ())
3009 /* All used inline functions must have a definition at this point. */
3010 for (i = 0; i < deferred_fns_used; ++i)
3012 tree decl = VARRAY_TREE (deferred_fns, i);
3014 if (/* Check online inline functions that were actually used. */
3015 TREE_USED (decl) && DECL_DECLARED_INLINE_P (decl)
3016 /* But not defined. */
3017 && DECL_REALLY_EXTERN (decl)
3018 /* If we decided to emit this function in another
3019 translation unit, the fact that the definition was
3020 missing here likely indicates only that the repository
3021 decided to place the function elsewhere. With -Winline,
3022 we will still warn if we could not inline the
3024 && !flag_use_repository
3025 /* An explicit instantiation can be used to specify
3026 that the body is in another unit. It will have
3027 already verified there was a definition. */
3028 && !DECL_EXPLICIT_INSTANTIATION (decl))
3030 cp_warning_at ("inline function `%D' used but never defined", decl);
3031 /* This symbol is effectively an "extern" declaration now.
3032 This is not strictly necessary, but removes a duplicate
3034 TREE_PUBLIC (decl) = 1;
3038 /* We give C linkage to static constructors and destructors. */
3039 push_lang_context (lang_name_c);
3041 /* Generate initialization and destruction functions for all
3042 priorities for which they are required. */
3043 if (priority_info_map)
3044 splay_tree_foreach (priority_info_map,
3045 generate_ctor_and_dtor_functions_for_priority,
3051 generate_ctor_or_dtor_function (/*constructor_p=*/true,
3052 DEFAULT_INIT_PRIORITY, &locus);
3054 generate_ctor_or_dtor_function (/*constructor_p=*/false,
3055 DEFAULT_INIT_PRIORITY, &locus);
3058 /* We're done with the splay-tree now. */
3059 if (priority_info_map)
3060 splay_tree_delete (priority_info_map);
3062 /* We're done with static constructors, so we can go back to "C++"
3064 pop_lang_context ();
3066 cgraph_finalize_compilation_unit ();
3069 /* Emit mudflap static registration function. This must be done
3070 after all the user functions have been expanded. */
3072 mudflap_finish_file ();
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"