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 && !TYPE_USES_VIRTUAL_BASECLASSES (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 (TYPE_USES_VIRTUAL_BASECLASSES (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 `%#D'", exp);
428 t = build_expr_type_conversion (WANT_POINTER, exp, true);
430 if (t == NULL_TREE || t == error_mark_node)
432 error ("type `%#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 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 `%T' 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 `%#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 `%#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 `%#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 '%D' has non-Java return type `%T'",
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 '%D' has non-Java parameter type `%T'",
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 specifiy 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 && is_member_template (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 = lookup_fnfields_1 (complete_type (ctype),
625 DECL_CONSTRUCTOR_P (function) ? ctor_identifier :
626 DECL_DESTRUCTOR_P (function) ? dtor_identifier :
627 DECL_NAME (function));
631 VEC(tree) *methods = CLASSTYPE_METHOD_VEC (ctype);
632 tree fndecls, fndecl = 0;
635 const char *format = NULL;
637 pop_p = push_scope (ctype);
638 for (fndecls = VEC_index (tree, methods, ix);
639 fndecls; fndecls = OVL_NEXT (fndecls))
643 fndecl = OVL_CURRENT (fndecls);
644 p1 = TYPE_ARG_TYPES (TREE_TYPE (function));
645 p2 = TYPE_ARG_TYPES (TREE_TYPE (fndecl));
647 /* We cannot simply call decls_match because this doesn't
648 work for static member functions that are pretending to
649 be methods, and because the name may have been changed by
652 /* Get rid of the this parameter on functions that become
654 if (DECL_STATIC_FUNCTION_P (fndecl)
655 && TREE_CODE (TREE_TYPE (function)) == METHOD_TYPE)
656 p1 = TREE_CHAIN (p1);
658 /* A member template definition only matches a member template
660 if (is_template != (TREE_CODE (fndecl) == TEMPLATE_DECL))
663 if (same_type_p (TREE_TYPE (TREE_TYPE (function)),
664 TREE_TYPE (TREE_TYPE (fndecl)))
665 && compparms (p1, p2)
667 || comp_template_parms (template_parms,
668 DECL_TEMPLATE_PARMS (fndecl)))
669 && (DECL_TEMPLATE_SPECIALIZATION (function)
670 == DECL_TEMPLATE_SPECIALIZATION (fndecl))
671 && (!DECL_TEMPLATE_SPECIALIZATION (function)
672 || (DECL_TI_TEMPLATE (function)
673 == DECL_TI_TEMPLATE (fndecl))))
679 return OVL_CURRENT (fndecls);
680 error ("prototype for `%#D' does not match any in class `%T'",
682 is_conv_op = DECL_CONV_FN_P (fndecl);
685 ix = CLASSTYPE_FIRST_CONVERSION_SLOT;
686 fndecls = VEC_index (tree, methods, ix);
689 fndecl = OVL_CURRENT (fndecls);
690 fndecls = OVL_NEXT (fndecls);
692 if (!fndecls && is_conv_op)
694 if (VEC_length (tree, methods) > (size_t) ++ix)
696 fndecls = VEC_index (tree, methods, ix);
697 if (!DECL_CONV_FN_P (OVL_CURRENT (fndecls)))
709 format = "candidates are: %#D";
711 format = "candidate is: %#D";
712 cp_error_at (format, fndecl);
715 else if (!COMPLETE_TYPE_P (ctype))
716 cxx_incomplete_type_error (function, ctype);
718 error ("no `%#D' member function declared in class `%T'",
721 /* If we did not find the method in the class, add it to avoid
722 spurious errors (unless the CTYPE is not yet defined, in which
723 case we'll only confuse ourselves when the function is declared
724 properly within the class. */
725 if (COMPLETE_TYPE_P (ctype))
726 add_method (ctype, function);
730 /* DECL is a function with vague linkage. Remember it so that at the
731 end of the translation unit we can decide whether or not to emit
735 note_vague_linkage_fn (tree decl)
737 if (!DECL_DEFERRED_FN (decl))
739 DECL_DEFERRED_FN (decl) = 1;
740 DECL_DEFER_OUTPUT (decl) = 1;
742 VARRAY_TREE_INIT (deferred_fns, 32, "deferred_fns");
743 VARRAY_PUSH_TREE (deferred_fns, decl);
747 /* Like note_vague_linkage_fn but for variables. */
750 note_vague_linkage_var (tree var)
752 if (!pending_statics)
753 VARRAY_TREE_INIT (pending_statics, 32, "pending_statics");
754 VARRAY_PUSH_TREE (pending_statics, var);
757 /* We have just processed the DECL, which is a static data member.
758 Its initializer, if present, is INIT. The ASMSPEC_TREE, if
759 present, is the assembly-language name for the data member.
760 FLAGS is as for cp_finish_decl. */
763 finish_static_data_member_decl (tree decl, tree init, tree asmspec_tree,
766 gcc_assert (TREE_PUBLIC (decl));
768 DECL_CONTEXT (decl) = current_class_type;
770 /* We cannot call pushdecl here, because that would fill in the
771 TREE_CHAIN of our decl. Instead, we modify cp_finish_decl to do
772 the right thing, namely, to put this decl out straight away. */
773 /* current_class_type can be NULL_TREE in case of error. */
774 if (!asmspec_tree && current_class_type)
775 DECL_INITIAL (decl) = error_mark_node;
777 if (! processing_template_decl)
778 note_vague_linkage_var (decl);
780 if (LOCAL_CLASS_P (current_class_type))
781 pedwarn ("local class `%#T' shall not have static data member `%#D'",
782 current_class_type, decl);
784 /* Static consts need not be initialized in the class definition. */
785 if (init != NULL_TREE && TYPE_NEEDS_CONSTRUCTING (TREE_TYPE (decl)))
787 static int explained = 0;
789 error ("initializer invalid for static member with constructor");
792 error ("(an out of class initialization is required)");
797 /* Force the compiler to know when an uninitialized static const
798 member is being used. */
799 if (CP_TYPE_CONST_P (TREE_TYPE (decl)) && init == 0)
800 TREE_USED (decl) = 1;
801 DECL_INITIAL (decl) = init;
802 DECL_IN_AGGR_P (decl) = 1;
804 cp_finish_decl (decl, init, asmspec_tree, flags);
807 /* Process the specs, declarator (NULL if omitted) and width (NULL if omitted)
808 of a structure component, returning a _DECL node.
809 QUALS is a list of type qualifiers for this decl (such as for declaring
810 const member functions).
812 This is done during the parsing of the struct declaration.
813 The _DECL nodes are chained together and the lot of them
814 are ultimately passed to `build_struct' to make the RECORD_TYPE node.
816 If class A defines that certain functions in class B are friends, then
817 the way I have set things up, it is B who is interested in permission
818 granted by A. However, it is in A's context that these declarations
819 are parsed. By returning a void_type_node, class A does not attempt
820 to incorporate the declarations of the friends within its structure.
822 DO NOT MAKE ANY CHANGES TO THIS CODE WITHOUT MAKING CORRESPONDING
823 CHANGES TO CODE IN `start_method'. */
826 grokfield (const cp_declarator *declarator,
827 cp_decl_specifier_seq *declspecs,
828 tree init, tree asmspec_tree,
832 const char *asmspec = 0;
833 int flags = LOOKUP_ONLYCONVERTING;
835 if (!declspecs->any_specifiers_p
836 && declarator->kind == cdk_id
837 && TREE_CODE (declarator->u.id.name) == SCOPE_REF
838 && (TREE_CODE (TREE_OPERAND (declarator->u.id.name, 1))
840 /* Access declaration */
841 return do_class_using_decl (declarator->u.id.name);
844 && TREE_CODE (init) == TREE_LIST
845 && TREE_VALUE (init) == error_mark_node
846 && TREE_CHAIN (init) == NULL_TREE)
849 value = grokdeclarator (declarator, declspecs, FIELD, init != 0, &attrlist);
850 if (! value || error_operand_p (value))
851 /* friend or constructor went bad. */
852 return error_mark_node;
854 if (TREE_CODE (value) == TYPE_DECL && init)
856 error ("typedef `%D' is initialized (use __typeof__ instead)", value);
860 /* Pass friendly classes back. */
861 if (value == void_type_node)
864 /* Pass friend decls back. */
865 if ((TREE_CODE (value) == FUNCTION_DECL
866 || TREE_CODE (value) == TEMPLATE_DECL)
867 && DECL_CONTEXT (value) != current_class_type)
870 if (DECL_NAME (value) != NULL_TREE
871 && IDENTIFIER_POINTER (DECL_NAME (value))[0] == '_'
872 && ! strcmp (IDENTIFIER_POINTER (DECL_NAME (value)), "_vptr"))
873 error ("member `%D' conflicts with virtual function table field name",
876 /* Stash away type declarations. */
877 if (TREE_CODE (value) == TYPE_DECL)
879 DECL_NONLOCAL (value) = 1;
880 DECL_CONTEXT (value) = current_class_type;
882 if (processing_template_decl)
883 value = push_template_decl (value);
888 if (DECL_IN_AGGR_P (value))
890 error ("`%D' is already defined in `%T'", value,
891 DECL_CONTEXT (value));
892 return void_type_node;
896 asmspec = TREE_STRING_POINTER (asmspec_tree);
900 if (TREE_CODE (value) == FUNCTION_DECL)
902 grok_function_init (value, init);
905 else if (pedantic && TREE_CODE (value) != VAR_DECL)
906 /* Already complained in grokdeclarator. */
910 /* We allow initializers to become parameters to base
912 if (TREE_CODE (init) == TREE_LIST)
914 if (TREE_CHAIN (init) == NULL_TREE)
915 init = TREE_VALUE (init);
917 init = digest_init (TREE_TYPE (value), init, (tree *)0);
920 if (!processing_template_decl)
922 if (TREE_CODE (init) == CONST_DECL)
923 init = DECL_INITIAL (init);
924 else if (TREE_READONLY_DECL_P (init))
925 init = decl_constant_value (init);
926 else if (TREE_CODE (init) == CONSTRUCTOR)
927 init = digest_init (TREE_TYPE (value), init, (tree *)0);
928 if (init != error_mark_node && ! TREE_CONSTANT (init))
930 /* We can allow references to things that are effectively
931 static, since references are initialized with the
933 if (TREE_CODE (TREE_TYPE (value)) != REFERENCE_TYPE
934 || (TREE_STATIC (init) == 0
935 && (!DECL_P (init) || DECL_EXTERNAL (init) == 0)))
937 error ("field initializer is not constant");
938 init = error_mark_node;
945 if (processing_template_decl
946 && (TREE_CODE (value) == VAR_DECL || TREE_CODE (value) == FUNCTION_DECL))
948 value = push_template_decl (value);
949 if (error_operand_p (value))
950 return error_mark_node;
954 cplus_decl_attributes (&value, attrlist, 0);
956 if (TREE_CODE (value) == VAR_DECL)
958 finish_static_data_member_decl (value, init, asmspec_tree,
962 if (TREE_CODE (value) == FIELD_DECL)
965 error ("`asm' specifiers are not permitted on non-static data members");
966 if (DECL_INITIAL (value) == error_mark_node)
967 init = error_mark_node;
968 cp_finish_decl (value, init, NULL_TREE, flags);
969 DECL_INITIAL (value) = init;
970 DECL_IN_AGGR_P (value) = 1;
973 if (TREE_CODE (value) == FUNCTION_DECL)
976 set_user_assembler_name (value, asmspec);
977 if (!DECL_FRIEND_P (value))
978 grok_special_member_properties (value);
980 cp_finish_decl (value, init, asmspec_tree, flags);
982 /* Pass friends back this way. */
983 if (DECL_FRIEND_P (value))
984 return void_type_node;
986 DECL_IN_AGGR_P (value) = 1;
994 /* Like `grokfield', but for bitfields.
995 WIDTH is non-NULL for bit fields only, and is an INTEGER_CST node. */
998 grokbitfield (const cp_declarator *declarator,
999 cp_decl_specifier_seq *declspecs, tree width)
1001 tree value = grokdeclarator (declarator, declspecs, BITFIELD, 0, NULL);
1003 if (! value) return NULL_TREE; /* friends went bad. */
1005 /* Pass friendly classes back. */
1006 if (TREE_CODE (value) == VOID_TYPE)
1007 return void_type_node;
1009 if (TREE_CODE (value) == TYPE_DECL)
1011 error ("cannot declare `%D' to be a bit-field type", value);
1015 /* Usually, finish_struct_1 catches bitfields with invalid types.
1016 But, in the case of bitfields with function type, we confuse
1017 ourselves into thinking they are member functions, so we must
1019 if (TREE_CODE (value) == FUNCTION_DECL)
1021 error ("cannot declare bit-field `%D' with function type",
1026 if (DECL_IN_AGGR_P (value))
1028 error ("`%D' is already defined in the class %T", value,
1029 DECL_CONTEXT (value));
1030 return void_type_node;
1033 if (TREE_STATIC (value))
1035 error ("static member `%D' cannot be a bit-field", value);
1038 cp_finish_decl (value, NULL_TREE, NULL_TREE, 0);
1040 if (width != error_mark_node)
1042 constant_expression_warning (width);
1043 DECL_INITIAL (value) = width;
1044 SET_DECL_C_BIT_FIELD (value);
1047 DECL_IN_AGGR_P (value) = 1;
1051 /* When a function is declared with an initializer,
1052 do the right thing. Currently, there are two possibilities:
1057 // initialization possibility #1.
1058 virtual void f () = 0;
1080 // initialization possibility #2
1087 grok_function_init (tree decl, tree init)
1089 /* An initializer for a function tells how this function should
1091 tree type = TREE_TYPE (decl);
1093 if (TREE_CODE (type) == FUNCTION_TYPE)
1094 error ("initializer specified for non-member function `%D'", decl);
1095 else if (integer_zerop (init))
1096 DECL_PURE_VIRTUAL_P (decl) = 1;
1098 error ("invalid initializer for virtual method `%D'", decl);
1102 cplus_decl_attributes (tree *decl, tree attributes, int flags)
1104 if (*decl == NULL_TREE || *decl == void_type_node)
1107 if (TREE_CODE (*decl) == TEMPLATE_DECL)
1108 decl = &DECL_TEMPLATE_RESULT (*decl);
1110 decl_attributes (decl, attributes, flags);
1112 if (TREE_CODE (*decl) == TYPE_DECL)
1113 SET_IDENTIFIER_TYPE_VALUE (DECL_NAME (*decl), TREE_TYPE (*decl));
1116 /* Walks through the namespace- or function-scope anonymous union OBJECT,
1117 building appropriate ALIAS_DECLs. Returns one of the fields for use in
1118 the mangled name. */
1121 build_anon_union_vars (tree object)
1123 tree type = TREE_TYPE (object);
1124 tree main_decl = NULL_TREE;
1127 /* Rather than write the code to handle the non-union case,
1128 just give an error. */
1129 if (TREE_CODE (type) != UNION_TYPE)
1130 error ("anonymous struct not inside named type");
1132 for (field = TYPE_FIELDS (type);
1134 field = TREE_CHAIN (field))
1139 if (DECL_ARTIFICIAL (field))
1141 if (TREE_CODE (field) != FIELD_DECL)
1144 `%#D' invalid; an anonymous union can only have non-static data members",
1149 if (TREE_PRIVATE (field))
1150 cp_pedwarn_at ("private member `%#D' in anonymous union", field);
1151 else if (TREE_PROTECTED (field))
1152 cp_pedwarn_at ("protected member `%#D' in anonymous union", field);
1154 if (processing_template_decl)
1155 ref = build_min_nt (COMPONENT_REF, object,
1156 DECL_NAME (field), NULL_TREE);
1158 ref = build_class_member_access_expr (object, field, NULL_TREE,
1161 if (DECL_NAME (field))
1163 decl = build_decl (ALIAS_DECL, DECL_NAME (field), TREE_TYPE (field));
1164 DECL_INITIAL (decl) = ref;
1165 TREE_PUBLIC (decl) = 0;
1166 TREE_STATIC (decl) = 0;
1167 DECL_EXTERNAL (decl) = 1;
1168 decl = pushdecl (decl);
1170 else if (ANON_AGGR_TYPE_P (TREE_TYPE (field)))
1171 decl = build_anon_union_vars (ref);
1175 if (main_decl == NULL_TREE)
1182 /* Finish off the processing of a UNION_TYPE structure. If the union is an
1183 anonymous union, then all members must be laid out together. PUBLIC_P
1184 is nonzero if this union is not declared static. */
1187 finish_anon_union (tree anon_union_decl)
1189 tree type = TREE_TYPE (anon_union_decl);
1191 bool public_p = TREE_PUBLIC (anon_union_decl);
1193 /* The VAR_DECL's context is the same as the TYPE's context. */
1194 DECL_CONTEXT (anon_union_decl) = DECL_CONTEXT (TYPE_NAME (type));
1196 if (TYPE_FIELDS (type) == NULL_TREE)
1201 error ("namespace-scope anonymous aggregates must be static");
1205 main_decl = build_anon_union_vars (anon_union_decl);
1206 if (main_decl == NULL_TREE)
1208 warning ("anonymous union with no members");
1212 if (!processing_template_decl)
1214 /* Use main_decl to set the mangled name. */
1215 DECL_NAME (anon_union_decl) = DECL_NAME (main_decl);
1216 mangle_decl (anon_union_decl);
1217 DECL_NAME (anon_union_decl) = NULL_TREE;
1220 pushdecl (anon_union_decl);
1221 if (building_stmt_tree ()
1222 && at_function_scope_p ())
1223 add_decl_expr (anon_union_decl);
1224 else if (!processing_template_decl)
1225 rest_of_decl_compilation (anon_union_decl,
1226 toplevel_bindings_p (), at_eof);
1229 /* Auxiliary functions to make type signatures for
1230 `operator new' and `operator delete' correspond to
1231 what compiler will be expecting. */
1234 coerce_new_type (tree type)
1237 tree args = TYPE_ARG_TYPES (type);
1239 gcc_assert (TREE_CODE (type) == FUNCTION_TYPE);
1241 if (!same_type_p (TREE_TYPE (type), ptr_type_node))
1242 e = 1, error ("`operator new' must return type `%T'", ptr_type_node);
1244 if (!args || args == void_list_node
1245 || !same_type_p (TREE_VALUE (args), size_type_node))
1248 if (args && args != void_list_node)
1249 args = TREE_CHAIN (args);
1250 pedwarn ("`operator new' takes type `size_t' (`%T') as first parameter", size_type_node);
1255 args = tree_cons (NULL_TREE, size_type_node, args);
1258 type = build_exception_variant
1259 (build_function_type (ptr_type_node, args),
1260 TYPE_RAISES_EXCEPTIONS (type));
1268 coerce_delete_type (tree type)
1271 tree args = TYPE_ARG_TYPES (type);
1273 gcc_assert (TREE_CODE (type) == FUNCTION_TYPE);
1275 if (!same_type_p (TREE_TYPE (type), void_type_node))
1276 e = 1, error ("`operator delete' must return type `%T'", void_type_node);
1278 if (!args || args == void_list_node
1279 || !same_type_p (TREE_VALUE (args), ptr_type_node))
1282 if (args && args != void_list_node)
1283 args = TREE_CHAIN (args);
1284 error ("`operator delete' takes type `%T' as first parameter", ptr_type_node);
1289 args = tree_cons (NULL_TREE, ptr_type_node, args);
1292 type = build_exception_variant
1293 (build_function_type (void_type_node, args),
1294 TYPE_RAISES_EXCEPTIONS (type));
1303 mark_vtable_entries (tree decl)
1305 tree entries = CONSTRUCTOR_ELTS (DECL_INITIAL (decl));
1307 for (; entries; entries = TREE_CHAIN (entries))
1309 tree fnaddr = TREE_VALUE (entries);
1312 STRIP_NOPS (fnaddr);
1314 if (TREE_CODE (fnaddr) != ADDR_EXPR
1315 && TREE_CODE (fnaddr) != FDESC_EXPR)
1316 /* This entry is an offset: a virtual base class offset, a
1317 virtual call offset, an RTTI offset, etc. */
1320 fn = TREE_OPERAND (fnaddr, 0);
1321 TREE_ADDRESSABLE (fn) = 1;
1322 /* When we don't have vcall offsets, we output thunks whenever
1323 we output the vtables that contain them. With vcall offsets,
1324 we know all the thunks we'll need when we emit a virtual
1325 function, so we emit the thunks there instead. */
1326 if (DECL_THUNK_P (fn))
1327 use_thunk (fn, /*emit_p=*/0);
1332 /* Set DECL up to have the closest approximation of "initialized common"
1333 linkage available. */
1336 comdat_linkage (tree decl)
1339 make_decl_one_only (decl);
1340 else if (TREE_CODE (decl) == FUNCTION_DECL
1341 || (TREE_CODE (decl) == VAR_DECL && DECL_ARTIFICIAL (decl)))
1342 /* We can just emit function and compiler-generated variables
1343 statically; having multiple copies is (for the most part) only
1346 There are two correctness issues, however: the address of a
1347 template instantiation with external linkage should be the
1348 same, independent of what translation unit asks for the
1349 address, and this will not hold when we emit multiple copies of
1350 the function. However, there's little else we can do.
1352 Also, by default, the typeinfo implementation assumes that
1353 there will be only one copy of the string used as the name for
1354 each type. Therefore, if weak symbols are unavailable, the
1355 run-time library should perform a more conservative check; it
1356 should perform a string comparison, rather than an address
1358 TREE_PUBLIC (decl) = 0;
1361 /* Static data member template instantiations, however, cannot
1362 have multiple copies. */
1363 if (DECL_INITIAL (decl) == 0
1364 || DECL_INITIAL (decl) == error_mark_node)
1365 DECL_COMMON (decl) = 1;
1366 else if (EMPTY_CONSTRUCTOR_P (DECL_INITIAL (decl)))
1368 DECL_COMMON (decl) = 1;
1369 DECL_INITIAL (decl) = error_mark_node;
1371 else if (!DECL_EXPLICIT_INSTANTIATION (decl))
1373 /* We can't do anything useful; leave vars for explicit
1375 DECL_EXTERNAL (decl) = 1;
1376 DECL_NOT_REALLY_EXTERN (decl) = 0;
1380 if (DECL_LANG_SPECIFIC (decl))
1381 DECL_COMDAT (decl) = 1;
1384 /* For win32 we also want to put explicit instantiations in
1385 linkonce sections, so that they will be merged with implicit
1386 instantiations; otherwise we get duplicate symbol errors.
1387 For Darwin we do not want explicit instantiations to be
1391 maybe_make_one_only (tree decl)
1393 /* We used to say that this was not necessary on targets that support weak
1394 symbols, because the implicit instantiations will defer to the explicit
1395 one. However, that's not actually the case in SVR4; a strong definition
1396 after a weak one is an error. Also, not making explicit
1397 instantiations one_only means that we can end up with two copies of
1398 some template instantiations. */
1402 /* We can't set DECL_COMDAT on functions, or finish_file will think
1403 we can get away with not emitting them if they aren't used. We need
1404 to for variables so that cp_finish_decl will update their linkage,
1405 because their DECL_INITIAL may not have been set properly yet. */
1407 if (!TARGET_WEAK_NOT_IN_ARCHIVE_TOC
1408 || (! DECL_EXPLICIT_INSTANTIATION (decl)
1409 && ! DECL_TEMPLATE_SPECIALIZATION (decl)))
1411 make_decl_one_only (decl);
1413 if (TREE_CODE (decl) == VAR_DECL)
1415 DECL_COMDAT (decl) = 1;
1416 /* Mark it needed so we don't forget to emit it. */
1417 mark_decl_referenced (decl);
1422 /* Determine whether or not we want to specifically import or export CTYPE,
1423 using various heuristics. */
1426 import_export_class (tree ctype)
1428 /* -1 for imported, 1 for exported. */
1429 int import_export = 0;
1431 /* It only makes sense to call this function at EOF. The reason is
1432 that this function looks at whether or not the first non-inline
1433 non-abstract virtual member function has been defined in this
1434 translation unit. But, we can't possibly know that until we've
1435 seen the entire translation unit. */
1436 gcc_assert (at_eof);
1438 if (CLASSTYPE_INTERFACE_KNOWN (ctype))
1441 /* If MULTIPLE_SYMBOL_SPACES is defined and we saw a #pragma interface,
1442 we will have CLASSTYPE_INTERFACE_ONLY set but not
1443 CLASSTYPE_INTERFACE_KNOWN. In that case, we don't want to use this
1444 heuristic because someone will supply a #pragma implementation
1445 elsewhere, and deducing it here would produce a conflict. */
1446 if (CLASSTYPE_INTERFACE_ONLY (ctype))
1449 if (lookup_attribute ("dllimport", TYPE_ATTRIBUTES (ctype)))
1451 else if (lookup_attribute ("dllexport", TYPE_ATTRIBUTES (ctype)))
1453 else if (CLASSTYPE_IMPLICIT_INSTANTIATION (ctype)
1454 && !flag_implicit_templates)
1455 /* For a template class, without -fimplicit-templates, check the
1456 repository. If the virtual table is assigned to this
1457 translation unit, then export the class; otherwise, import
1459 import_export = repo_export_class_p (ctype) ? 1 : -1;
1460 else if (TYPE_POLYMORPHIC_P (ctype))
1462 /* The ABI specifies that the virtual table and associated
1463 information are emitted with the key method, if any. */
1464 tree method = CLASSTYPE_KEY_METHOD (ctype);
1465 /* If weak symbol support is not available, then we must be
1466 careful not to emit the vtable when the key function is
1467 inline. An inline function can be defined in multiple
1468 translation units. If we were to emit the vtable in each
1469 translation unit containing a definition, we would get
1470 multiple definition errors at link-time. */
1471 if (method && (flag_weak || ! DECL_DECLARED_INLINE_P (method)))
1472 import_export = (DECL_REALLY_EXTERN (method) ? -1 : 1);
1475 #ifdef MULTIPLE_SYMBOL_SPACES
1476 if (import_export == -1)
1480 /* Allow backends the chance to overrule the decision. */
1481 if (targetm.cxx.import_export_class)
1482 import_export = targetm.cxx.import_export_class (ctype, import_export);
1486 SET_CLASSTYPE_INTERFACE_KNOWN (ctype);
1487 CLASSTYPE_INTERFACE_ONLY (ctype) = (import_export < 0);
1491 /* Return true if VAR has already been provided to the back end; in that
1492 case VAR should not be modified further by the front end. */
1494 var_finalized_p (tree var)
1496 return cgraph_varpool_node (var)->finalized;
1499 /* DECL is a VAR_DECL or FUNCTION_DECL which, for whatever reason,
1500 must be emitted in this translation unit. Mark it as such. */
1503 mark_needed (tree decl)
1505 /* It's possible that we no longer need to set
1506 TREE_SYMBOL_REFERENCED here directly, but doing so is
1508 TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)) = 1;
1509 mark_decl_referenced (decl);
1512 /* DECL is either a FUNCTION_DECL or a VAR_DECL. This function
1513 returns true if a definition of this entity should be provided in
1514 this object file. Callers use this function to determine whether
1515 or not to let the back end know that a definition of DECL is
1516 available in this translation unit. */
1519 decl_needed_p (tree decl)
1521 gcc_assert (TREE_CODE (decl) == VAR_DECL
1522 || TREE_CODE (decl) == FUNCTION_DECL);
1523 /* This function should only be called at the end of the translation
1524 unit. We cannot be sure of whether or not something will be
1525 COMDAT until that point. */
1526 gcc_assert (at_eof);
1528 /* All entities with external linkage that are not COMDAT should be
1529 emitted; they may be referred to from other object files. */
1530 if (TREE_PUBLIC (decl) && !DECL_COMDAT (decl))
1532 /* If this entity was used, let the back-end see it; it will decide
1533 whether or not to emit it into the object file. */
1534 if (TREE_USED (decl)
1535 || (DECL_ASSEMBLER_NAME_SET_P (decl)
1536 && TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))))
1538 /* Otherwise, DECL does not need to be emitted -- yet. A subsequent
1539 reference to DECL might cause it to be emitted later. */
1543 /* If necessary, write out the vtables for the dynamic class CTYPE.
1544 Returns true if any vtables were emitted. */
1547 maybe_emit_vtables (tree ctype)
1553 /* If the vtables for this class have already been emitted there is
1554 nothing more to do. */
1555 primary_vtbl = CLASSTYPE_VTABLES (ctype);
1556 if (var_finalized_p (primary_vtbl))
1558 /* Ignore dummy vtables made by get_vtable_decl. */
1559 if (TREE_TYPE (primary_vtbl) == void_type_node)
1562 /* See if any of the vtables are needed. */
1563 for (vtbl = CLASSTYPE_VTABLES (ctype); vtbl; vtbl = TREE_CHAIN (vtbl))
1565 import_export_decl (vtbl);
1566 if (DECL_NOT_REALLY_EXTERN (vtbl) && decl_needed_p (vtbl))
1571 /* If the references to this class' vtables are optimized away,
1572 still emit the appropriate debugging information. See
1574 if (DECL_COMDAT (primary_vtbl)
1575 && CLASSTYPE_DEBUG_REQUESTED (ctype))
1576 note_debug_info_needed (ctype);
1580 /* The ABI requires that we emit all of the vtables if we emit any
1582 for (vtbl = CLASSTYPE_VTABLES (ctype); vtbl; vtbl = TREE_CHAIN (vtbl))
1584 /* Mark entities references from the virtual table as used. */
1585 mark_vtable_entries (vtbl);
1587 if (TREE_TYPE (DECL_INITIAL (vtbl)) == 0)
1589 /* It had better be all done at compile-time. */
1590 if (store_init_value (vtbl, DECL_INITIAL (vtbl)))
1595 DECL_EXTERNAL (vtbl) = 0;
1596 rest_of_decl_compilation (vtbl, 1, 1);
1598 /* Because we're only doing syntax-checking, we'll never end up
1599 actually marking the variable as written. */
1600 if (flag_syntax_only)
1601 TREE_ASM_WRITTEN (vtbl) = 1;
1604 /* Since we're writing out the vtable here, also write the debug
1606 note_debug_info_needed (ctype);
1611 /* Like c_determine_visibility, but with additional C++-specific
1615 determine_visibility (tree decl)
1619 /* Cloned constructors and destructors get the same visibility as
1620 the underlying function. That should be set up in
1621 maybe_clone_body. */
1622 gcc_assert (!DECL_CLONED_FUNCTION_P (decl));
1624 /* Give the common code a chance to make a determination. */
1625 if (c_determine_visibility (decl))
1628 /* If DECL is a member of a class, visibility specifiers on the
1629 class can influence the visibility of the DECL. */
1630 if (DECL_CLASS_SCOPE_P (decl))
1631 class_type = DECL_CONTEXT (decl);
1632 else if (TREE_CODE (decl) == VAR_DECL
1633 && DECL_TINFO_P (decl)
1634 && CLASS_TYPE_P (TREE_TYPE (DECL_NAME (decl))))
1635 class_type = TREE_TYPE (DECL_NAME (decl));
1638 /* Virtual tables have DECL_CONTEXT set to their associated class,
1639 so they are automatically handled above. */
1640 gcc_assert (TREE_CODE (decl) != VAR_DECL
1641 || !DECL_VTABLE_OR_VTT_P (decl));
1642 /* Entities not associated with any class just get the
1643 visibility specified by their attributes. */
1647 /* By default, static data members and function members receive
1648 the visibility of their containing class. */
1651 if (TARGET_DLLIMPORT_DECL_ATTRIBUTES
1652 && lookup_attribute ("dllexport", TYPE_ATTRIBUTES (class_type)))
1654 DECL_VISIBILITY (decl) = VISIBILITY_DEFAULT;
1655 DECL_VISIBILITY_SPECIFIED (decl) = 1;
1659 if (TREE_CODE (decl) == FUNCTION_DECL
1660 && DECL_DECLARED_INLINE_P (decl)
1661 && visibility_options.inlines_hidden)
1663 DECL_VISIBILITY (decl) = VISIBILITY_HIDDEN;
1664 DECL_VISIBILITY_SPECIFIED (decl) = 1;
1668 DECL_VISIBILITY (decl) = CLASSTYPE_VISIBILITY (class_type);
1669 DECL_VISIBILITY_SPECIFIED (decl)
1670 = CLASSTYPE_VISIBILITY_SPECIFIED (class_type);
1675 /* DECL is a FUNCTION_DECL or VAR_DECL. If the object file linkage
1676 for DECL has not already been determined, do so now by setting
1677 DECL_EXTERNAL, DECL_COMDAT and other related flags. Until this
1678 function is called entities with vague linkage whose definitions
1679 are available must have TREE_PUBLIC set.
1681 If this function decides to place DECL in COMDAT, it will set
1682 appropriate flags -- but will not clear DECL_EXTERNAL. It is up to
1683 the caller to decide whether or not to clear DECL_EXTERNAL. Some
1684 callers defer that decision until it is clear that DECL is actually
1688 import_export_decl (tree decl)
1694 if (DECL_INTERFACE_KNOWN (decl))
1697 /* We cannot determine what linkage to give to an entity with vague
1698 linkage until the end of the file. For example, a virtual table
1699 for a class will be defined if and only if the key method is
1700 defined in this translation unit. As a further example, consider
1701 that when compiling a translation unit that uses PCH file with
1702 "-frepo" it would be incorrect to make decisions about what
1703 entities to emit when building the PCH; those decisions must be
1704 delayed until the repository information has been processed. */
1705 gcc_assert (at_eof);
1706 /* Object file linkage for explicit instantiations is handled in
1707 mark_decl_instantiated. For static variables in functions with
1708 vague linkage, maybe_commonize_var is used.
1710 Therefore, the only declarations that should be provided to this
1711 function are those with external linkage that:
1713 * implicit instantiations of function templates
1717 * implicit instantiations of static data members of class
1724 Furthermore, all entities that reach this point must have a
1725 definition available in this translation unit.
1727 The following assertions check these conditions. */
1728 gcc_assert (TREE_CODE (decl) == FUNCTION_DECL
1729 || TREE_CODE (decl) == VAR_DECL);
1730 /* Any code that creates entities with TREE_PUBLIC cleared should
1731 also set DECL_INTERFACE_KNOWN. */
1732 gcc_assert (TREE_PUBLIC (decl));
1733 if (TREE_CODE (decl) == FUNCTION_DECL)
1734 gcc_assert (DECL_IMPLICIT_INSTANTIATION (decl)
1735 || DECL_FRIEND_PSEUDO_TEMPLATE_INSTANTIATION (decl)
1736 || DECL_DECLARED_INLINE_P (decl));
1738 gcc_assert (DECL_IMPLICIT_INSTANTIATION (decl)
1739 || DECL_VTABLE_OR_VTT_P (decl)
1740 || DECL_TINFO_P (decl));
1741 /* Check that a definition of DECL is available in this translation
1743 gcc_assert (!DECL_REALLY_EXTERN (decl));
1745 /* Assume that DECL will not have COMDAT linkage. */
1747 /* Assume that DECL will not be imported into this translation
1751 /* See if the repository tells us whether or not to emit DECL in
1752 this translation unit. */
1753 emit_p = repo_emit_p (decl);
1756 else if (emit_p == 1)
1758 /* The repository indicates that this entity should be defined
1759 here. Make sure the back end honors that request. */
1760 if (TREE_CODE (decl) == VAR_DECL)
1762 else if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (decl)
1763 || DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P (decl))
1766 FOR_EACH_CLONE (clone, decl)
1767 mark_needed (clone);
1771 /* Output the definition as an ordinary strong definition. */
1772 DECL_EXTERNAL (decl) = 0;
1773 DECL_INTERFACE_KNOWN (decl) = 1;
1778 /* We have already decided what to do with this DECL; there is no
1779 need to check anything further. */
1781 else if (TREE_CODE (decl) == VAR_DECL && DECL_VTABLE_OR_VTT_P (decl))
1783 tree type = DECL_CONTEXT (decl);
1784 import_export_class (type);
1785 if (TYPE_FOR_JAVA (type))
1787 else if (CLASSTYPE_INTERFACE_KNOWN (type)
1788 && CLASSTYPE_INTERFACE_ONLY (type))
1790 else if (TARGET_WEAK_NOT_IN_ARCHIVE_TOC
1791 && !CLASSTYPE_USE_TEMPLATE (type)
1792 && CLASSTYPE_KEY_METHOD (type)
1793 && !DECL_DECLARED_INLINE_P (CLASSTYPE_KEY_METHOD (type)))
1794 /* The ABI requires that all virtual tables be emitted with
1795 COMDAT linkage. However, on systems where COMDAT symbols
1796 don't show up in the table of contents for a static
1797 archive, the linker will report errors about undefined
1798 symbols because it will not see the virtual table
1799 definition. Therefore, in the case that we know that the
1800 virtual table will be emitted in only one translation
1801 unit, we make the virtual table an ordinary definition
1802 with external linkage. */
1803 DECL_EXTERNAL (decl) = 0;
1804 else if (CLASSTYPE_INTERFACE_KNOWN (type))
1806 /* TYPE is being exported from this translation unit, so DECL
1807 should be defined here. The ABI requires COMDAT
1808 linkage. Normally, we only emit COMDAT things when they
1809 are needed; make sure that we realize that this entity is
1814 else if (!flag_implicit_templates
1815 && CLASSTYPE_IMPLICIT_INSTANTIATION (type))
1820 else if (TREE_CODE (decl) == VAR_DECL && DECL_TINFO_P (decl))
1822 tree type = TREE_TYPE (DECL_NAME (decl));
1823 if (CLASS_TYPE_P (type))
1825 import_export_class (type);
1826 if (CLASSTYPE_INTERFACE_KNOWN (type)
1827 && TYPE_POLYMORPHIC_P (type)
1828 && CLASSTYPE_INTERFACE_ONLY (type)
1829 /* If -fno-rtti was specified, then we cannot be sure
1830 that RTTI information will be emitted with the
1831 virtual table of the class, so we must emit it
1832 wherever it is used. */
1838 if (CLASSTYPE_INTERFACE_KNOWN (type)
1839 && !CLASSTYPE_INTERFACE_ONLY (type))
1846 else if (DECL_TEMPLATE_INSTANTIATION (decl)
1847 || DECL_FRIEND_PSEUDO_TEMPLATE_INSTANTIATION (decl))
1849 /* DECL is an implicit instantiation of a function or static
1851 if (flag_implicit_templates
1852 || (flag_implicit_inline_templates
1853 && TREE_CODE (decl) == FUNCTION_DECL
1854 && DECL_DECLARED_INLINE_P (decl)))
1857 /* If we are not implicitly generating templates, then mark
1858 this entity as undefined in this translation unit. */
1861 else if (DECL_FUNCTION_MEMBER_P (decl))
1863 if (!DECL_DECLARED_INLINE_P (decl))
1865 tree ctype = DECL_CONTEXT (decl);
1866 import_export_class (ctype);
1867 if (CLASSTYPE_INTERFACE_KNOWN (ctype))
1869 DECL_NOT_REALLY_EXTERN (decl)
1870 = ! (CLASSTYPE_INTERFACE_ONLY (ctype)
1871 || (DECL_DECLARED_INLINE_P (decl)
1872 && ! flag_implement_inlines
1873 && !DECL_VINDEX (decl)));
1875 if (!DECL_NOT_REALLY_EXTERN (decl))
1876 DECL_EXTERNAL (decl) = 1;
1878 /* Always make artificials weak. */
1879 if (DECL_ARTIFICIAL (decl) && flag_weak)
1882 maybe_make_one_only (decl);
1893 /* If we are importing DECL into this translation unit, mark is
1894 an undefined here. */
1895 DECL_EXTERNAL (decl) = 1;
1896 DECL_NOT_REALLY_EXTERN (decl) = 0;
1900 /* If we decided to put DECL in COMDAT, mark it accordingly at
1902 comdat_linkage (decl);
1905 DECL_INTERFACE_KNOWN (decl) = 1;
1908 /* Return an expression that performs the destruction of DECL, which
1909 must be a VAR_DECL whose type has a non-trivial destructor, or is
1910 an array whose (innermost) elements have a non-trivial destructor. */
1913 build_cleanup (tree decl)
1916 tree type = TREE_TYPE (decl);
1918 /* This function should only be called for declarations that really
1919 require cleanups. */
1920 gcc_assert (!TYPE_HAS_TRIVIAL_DESTRUCTOR (type));
1922 /* Treat all objects with destructors as used; the destructor may do
1923 something substantive. */
1926 if (TREE_CODE (type) == ARRAY_TYPE)
1930 cxx_mark_addressable (decl);
1931 temp = build1 (ADDR_EXPR, build_pointer_type (type), decl);
1933 temp = build_delete (TREE_TYPE (temp), temp,
1934 sfk_complete_destructor,
1935 LOOKUP_NORMAL|LOOKUP_NONVIRTUAL|LOOKUP_DESTRUCTOR, 0);
1939 /* Returns the initialization guard variable for the variable DECL,
1940 which has static storage duration. */
1943 get_guard (tree decl)
1948 sname = mangle_guard_variable (decl);
1949 guard = IDENTIFIER_GLOBAL_VALUE (sname);
1954 /* We use a type that is big enough to contain a mutex as well
1955 as an integer counter. */
1956 guard_type = targetm.cxx.guard_type ();
1957 guard = build_decl (VAR_DECL, sname, guard_type);
1959 /* The guard should have the same linkage as what it guards. */
1960 TREE_PUBLIC (guard) = TREE_PUBLIC (decl);
1961 TREE_STATIC (guard) = TREE_STATIC (decl);
1962 DECL_COMMON (guard) = DECL_COMMON (decl);
1963 DECL_ONE_ONLY (guard) = DECL_ONE_ONLY (decl);
1964 if (TREE_PUBLIC (decl))
1965 DECL_WEAK (guard) = DECL_WEAK (decl);
1967 DECL_ARTIFICIAL (guard) = 1;
1968 TREE_USED (guard) = 1;
1969 pushdecl_top_level_and_finish (guard, NULL_TREE);
1974 /* Return those bits of the GUARD variable that should be set when the
1975 guarded entity is actually initialized. */
1978 get_guard_bits (tree guard)
1980 if (!targetm.cxx.guard_mask_bit ())
1982 /* We only set the first byte of the guard, in order to leave room
1983 for a mutex in the high-order bits. */
1984 guard = build1 (ADDR_EXPR,
1985 build_pointer_type (TREE_TYPE (guard)),
1987 guard = build1 (NOP_EXPR,
1988 build_pointer_type (char_type_node),
1990 guard = build1 (INDIRECT_REF, char_type_node, guard);
1996 /* Return an expression which determines whether or not the GUARD
1997 variable has already been initialized. */
2000 get_guard_cond (tree guard)
2004 /* Check to see if the GUARD is zero. */
2005 guard = get_guard_bits (guard);
2007 /* Mask off all but the low bit. */
2008 if (targetm.cxx.guard_mask_bit ())
2010 guard_value = integer_one_node;
2011 if (!same_type_p (TREE_TYPE (guard_value), TREE_TYPE (guard)))
2012 guard_value = convert (TREE_TYPE (guard), guard_value);
2013 guard = cp_build_binary_op (BIT_AND_EXPR, guard, guard_value);
2016 guard_value = integer_zero_node;
2017 if (!same_type_p (TREE_TYPE (guard_value), TREE_TYPE (guard)))
2018 guard_value = convert (TREE_TYPE (guard), guard_value);
2019 return cp_build_binary_op (EQ_EXPR, guard, guard_value);
2022 /* Return an expression which sets the GUARD variable, indicating that
2023 the variable being guarded has been initialized. */
2026 set_guard (tree guard)
2030 /* Set the GUARD to one. */
2031 guard = get_guard_bits (guard);
2032 guard_init = integer_one_node;
2033 if (!same_type_p (TREE_TYPE (guard_init), TREE_TYPE (guard)))
2034 guard_init = convert (TREE_TYPE (guard), guard_init);
2035 return build_modify_expr (guard, NOP_EXPR, guard_init);
2038 /* Start the process of running a particular set of global constructors
2039 or destructors. Subroutine of do_[cd]tors. */
2042 start_objects (int method_type, int initp)
2048 /* Make ctor or dtor function. METHOD_TYPE may be 'I' or 'D'. */
2050 if (initp != DEFAULT_INIT_PRIORITY)
2060 sprintf (type, "%c%c%.5u", method_type, joiner, initp);
2063 sprintf (type, "%c", method_type);
2065 fndecl = build_lang_decl (FUNCTION_DECL,
2066 get_file_function_name_long (type),
2067 build_function_type (void_type_node,
2069 start_preparsed_function (fndecl, /*attrs=*/NULL_TREE, SF_PRE_PARSED);
2071 /* It can be a static function as long as collect2 does not have
2072 to scan the object file to find its ctor/dtor routine. */
2073 TREE_PUBLIC (current_function_decl) = ! targetm.have_ctors_dtors;
2075 /* Mark this declaration as used to avoid spurious warnings. */
2076 TREE_USED (current_function_decl) = 1;
2078 /* Mark this function as a global constructor or destructor. */
2079 if (method_type == 'I')
2080 DECL_GLOBAL_CTOR_P (current_function_decl) = 1;
2082 DECL_GLOBAL_DTOR_P (current_function_decl) = 1;
2083 DECL_LANG_SPECIFIC (current_function_decl)->decl_flags.u2sel = 1;
2085 body = begin_compound_stmt (BCS_FN_BODY);
2087 /* We cannot allow these functions to be elided, even if they do not
2088 have external linkage. And, there's no point in deferring
2089 compilation of thes functions; they're all going to have to be
2091 DECL_INLINE (current_function_decl) = 0;
2092 DECL_UNINLINABLE (current_function_decl) = 1;
2097 /* Finish the process of running a particular set of global constructors
2098 or destructors. Subroutine of do_[cd]tors. */
2101 finish_objects (int method_type, int initp, tree body)
2106 finish_compound_stmt (body);
2107 fn = finish_function (0);
2108 expand_or_defer_fn (fn);
2110 /* When only doing semantic analysis, and no RTL generation, we
2111 can't call functions that directly emit assembly code; there is
2112 no assembly file in which to put the code. */
2113 if (flag_syntax_only)
2116 if (targetm.have_ctors_dtors)
2118 rtx fnsym = XEXP (DECL_RTL (fn), 0);
2119 if (method_type == 'I')
2120 (* targetm.asm_out.constructor) (fnsym, initp);
2122 (* targetm.asm_out.destructor) (fnsym, initp);
2126 /* The names of the parameters to the function created to handle
2127 initializations and destructions for objects with static storage
2129 #define INITIALIZE_P_IDENTIFIER "__initialize_p"
2130 #define PRIORITY_IDENTIFIER "__priority"
2132 /* The name of the function we create to handle initializations and
2133 destructions for objects with static storage duration. */
2134 #define SSDF_IDENTIFIER "__static_initialization_and_destruction"
2136 /* The declaration for the __INITIALIZE_P argument. */
2137 static GTY(()) tree initialize_p_decl;
2139 /* The declaration for the __PRIORITY argument. */
2140 static GTY(()) tree priority_decl;
2142 /* The declaration for the static storage duration function. */
2143 static GTY(()) tree ssdf_decl;
2145 /* All the static storage duration functions created in this
2146 translation unit. */
2147 static GTY(()) varray_type ssdf_decls;
2149 /* A map from priority levels to information about that priority
2150 level. There may be many such levels, so efficient lookup is
2152 static splay_tree priority_info_map;
2154 /* Begins the generation of the function that will handle all
2155 initialization and destruction of objects with static storage
2156 duration. The function generated takes two parameters of type
2157 `int': __INITIALIZE_P and __PRIORITY. If __INITIALIZE_P is
2158 nonzero, it performs initializations. Otherwise, it performs
2159 destructions. It only performs those initializations or
2160 destructions with the indicated __PRIORITY. The generated function
2163 It is assumed that this function will only be called once per
2164 translation unit. */
2167 start_static_storage_duration_function (unsigned count)
2172 char id[sizeof (SSDF_IDENTIFIER) + 1 /* '\0' */ + 32];
2174 /* Create the identifier for this function. It will be of the form
2175 SSDF_IDENTIFIER_<number>. */
2176 sprintf (id, "%s_%u", SSDF_IDENTIFIER, count);
2178 /* Create the parameters. */
2179 parm_types = void_list_node;
2180 parm_types = tree_cons (NULL_TREE, integer_type_node, parm_types);
2181 parm_types = tree_cons (NULL_TREE, integer_type_node, parm_types);
2182 type = build_function_type (void_type_node, parm_types);
2184 /* Create the FUNCTION_DECL itself. */
2185 ssdf_decl = build_lang_decl (FUNCTION_DECL,
2186 get_identifier (id),
2188 TREE_PUBLIC (ssdf_decl) = 0;
2189 DECL_ARTIFICIAL (ssdf_decl) = 1;
2191 /* Put this function in the list of functions to be called from the
2192 static constructors and destructors. */
2195 VARRAY_TREE_INIT (ssdf_decls, 32, "ssdf_decls");
2197 /* Take this opportunity to initialize the map from priority
2198 numbers to information about that priority level. */
2199 priority_info_map = splay_tree_new (splay_tree_compare_ints,
2200 /*delete_key_fn=*/0,
2201 /*delete_value_fn=*/
2202 (splay_tree_delete_value_fn) &free);
2204 /* We always need to generate functions for the
2205 DEFAULT_INIT_PRIORITY so enter it now. That way when we walk
2206 priorities later, we'll be sure to find the
2207 DEFAULT_INIT_PRIORITY. */
2208 get_priority_info (DEFAULT_INIT_PRIORITY);
2211 VARRAY_PUSH_TREE (ssdf_decls, ssdf_decl);
2213 /* Create the argument list. */
2214 initialize_p_decl = cp_build_parm_decl
2215 (get_identifier (INITIALIZE_P_IDENTIFIER), integer_type_node);
2216 DECL_CONTEXT (initialize_p_decl) = ssdf_decl;
2217 TREE_USED (initialize_p_decl) = 1;
2218 priority_decl = cp_build_parm_decl
2219 (get_identifier (PRIORITY_IDENTIFIER), integer_type_node);
2220 DECL_CONTEXT (priority_decl) = ssdf_decl;
2221 TREE_USED (priority_decl) = 1;
2223 TREE_CHAIN (initialize_p_decl) = priority_decl;
2224 DECL_ARGUMENTS (ssdf_decl) = initialize_p_decl;
2226 /* Put the function in the global scope. */
2227 pushdecl (ssdf_decl);
2229 /* Start the function itself. This is equivalent to declaring the
2232 static void __ssdf (int __initialize_p, init __priority_p);
2234 It is static because we only need to call this function from the
2235 various constructor and destructor functions for this module. */
2236 start_preparsed_function (ssdf_decl,
2237 /*attrs=*/NULL_TREE,
2240 /* Set up the scope of the outermost block in the function. */
2241 body = begin_compound_stmt (BCS_FN_BODY);
2243 /* This function must not be deferred because we are depending on
2244 its compilation to tell us what is TREE_SYMBOL_REFERENCED. */
2245 DECL_INLINE (ssdf_decl) = 0;
2246 DECL_UNINLINABLE (ssdf_decl) = 1;
2251 /* Finish the generation of the function which performs initialization
2252 and destruction of objects with static storage duration. After
2253 this point, no more such objects can be created. */
2256 finish_static_storage_duration_function (tree body)
2258 /* Close out the function. */
2259 finish_compound_stmt (body);
2260 expand_or_defer_fn (finish_function (0));
2263 /* Return the information about the indicated PRIORITY level. If no
2264 code to handle this level has yet been generated, generate the
2265 appropriate prologue. */
2267 static priority_info
2268 get_priority_info (int priority)
2273 n = splay_tree_lookup (priority_info_map,
2274 (splay_tree_key) priority);
2277 /* Create a new priority information structure, and insert it
2279 pi = xmalloc (sizeof (struct priority_info_s));
2280 pi->initializations_p = 0;
2281 pi->destructions_p = 0;
2282 splay_tree_insert (priority_info_map,
2283 (splay_tree_key) priority,
2284 (splay_tree_value) pi);
2287 pi = (priority_info) n->value;
2292 /* Set up to handle the initialization or destruction of DECL. If
2293 INITP is nonzero, we are initializing the variable. Otherwise, we
2294 are destroying it. */
2297 start_static_initialization_or_destruction (tree decl, int initp)
2299 tree guard_if_stmt = NULL_TREE;
2306 /* Figure out the priority for this declaration. */
2307 priority = DECL_INIT_PRIORITY (decl);
2309 priority = DEFAULT_INIT_PRIORITY;
2311 /* Remember that we had an initialization or finalization at this
2313 pi = get_priority_info (priority);
2315 pi->initializations_p = 1;
2317 pi->destructions_p = 1;
2319 /* Trick the compiler into thinking we are at the file and line
2320 where DECL was declared so that error-messages make sense, and so
2321 that the debugger will show somewhat sensible file and line
2323 input_location = DECL_SOURCE_LOCATION (decl);
2329 Access control for implicit calls to the constructors,
2330 the conversion functions, or the destructor called to
2331 create and destroy a static data member is performed as
2332 if these calls appeared in the scope of the member's
2335 we pretend we are in a static member function of the class of
2336 which the DECL is a member. */
2337 if (member_p (decl))
2339 DECL_CONTEXT (current_function_decl) = DECL_CONTEXT (decl);
2340 DECL_STATIC_FUNCTION_P (current_function_decl) = 1;
2343 /* Conditionalize this initialization on being in the right priority
2344 and being initializing/finalizing appropriately. */
2345 guard_if_stmt = begin_if_stmt ();
2346 cond = cp_build_binary_op (EQ_EXPR,
2348 build_int_cst (NULL_TREE, priority));
2349 init_cond = initp ? integer_one_node : integer_zero_node;
2350 init_cond = cp_build_binary_op (EQ_EXPR,
2353 cond = cp_build_binary_op (TRUTH_ANDIF_EXPR, cond, init_cond);
2355 /* Assume we don't need a guard. */
2357 /* We need a guard if this is an object with external linkage that
2358 might be initialized in more than one place. (For example, a
2359 static data member of a template, when the data member requires
2361 if (TREE_PUBLIC (decl) && (DECL_COMMON (decl)
2362 || DECL_ONE_ONLY (decl)
2363 || DECL_WEAK (decl)))
2367 guard = get_guard (decl);
2369 /* When using __cxa_atexit, we just check the GUARD as we would
2370 for a local static. */
2371 if (flag_use_cxa_atexit)
2373 /* When using __cxa_atexit, we never try to destroy
2374 anything from a static destructor. */
2376 guard_cond = get_guard_cond (guard);
2378 /* If we don't have __cxa_atexit, then we will be running
2379 destructors from .fini sections, or their equivalents. So,
2380 we need to know how many times we've tried to initialize this
2381 object. We do initializations only if the GUARD is zero,
2382 i.e., if we are the first to initialize the variable. We do
2383 destructions only if the GUARD is one, i.e., if we are the
2384 last to destroy the variable. */
2387 = cp_build_binary_op (EQ_EXPR,
2388 build_unary_op (PREINCREMENT_EXPR,
2394 = cp_build_binary_op (EQ_EXPR,
2395 build_unary_op (PREDECREMENT_EXPR,
2400 cond = cp_build_binary_op (TRUTH_ANDIF_EXPR, cond, guard_cond);
2403 finish_if_stmt_cond (cond, guard_if_stmt);
2405 /* If we're using __cxa_atexit, we have not already set the GUARD,
2406 so we must do so now. */
2407 if (guard && initp && flag_use_cxa_atexit)
2408 finish_expr_stmt (set_guard (guard));
2410 return guard_if_stmt;
2413 /* We've just finished generating code to do an initialization or
2414 finalization. GUARD_IF_STMT is the if-statement we used to guard
2415 the initialization. */
2418 finish_static_initialization_or_destruction (tree guard_if_stmt)
2420 finish_then_clause (guard_if_stmt);
2421 finish_if_stmt (guard_if_stmt);
2423 /* Now that we're done with DECL we don't need to pretend to be a
2424 member of its class any longer. */
2425 DECL_CONTEXT (current_function_decl) = NULL_TREE;
2426 DECL_STATIC_FUNCTION_P (current_function_decl) = 0;
2429 /* Generate code to do the initialization of DECL, a VAR_DECL with
2430 static storage duration. The initialization is INIT. */
2433 do_static_initialization (tree decl, tree init)
2437 /* Set up for the initialization. */
2439 = start_static_initialization_or_destruction (decl,
2442 /* Perform the initialization. */
2444 finish_expr_stmt (init);
2446 /* If we're using __cxa_atexit, register a a function that calls the
2447 destructor for the object. */
2448 if (flag_use_cxa_atexit)
2449 register_dtor_fn (decl);
2452 finish_static_initialization_or_destruction (guard_if_stmt);
2455 /* Generate code to do the static destruction of DECL. If DECL may be
2456 initialized more than once in different object files, GUARD is the
2457 guard variable to check. PRIORITY is the priority for the
2461 do_static_destruction (tree decl)
2465 /* If we're using __cxa_atexit, then destructors are registered
2466 immediately after objects are initialized. */
2467 gcc_assert (!flag_use_cxa_atexit);
2469 /* If we don't need a destructor, there's nothing to do. */
2470 if (TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
2473 /* Actually do the destruction. */
2474 guard_if_stmt = start_static_initialization_or_destruction (decl,
2476 finish_expr_stmt (build_cleanup (decl));
2477 finish_static_initialization_or_destruction (guard_if_stmt);
2480 /* VARS is a list of variables with static storage duration which may
2481 need initialization and/or finalization. Remove those variables
2482 that don't really need to be initialized or finalized, and return
2483 the resulting list. The order in which the variables appear in
2484 VARS is in reverse order of the order in which they should actually
2485 be initialized. The list we return is in the unreversed order;
2486 i.e., the first variable should be initialized first. */
2489 prune_vars_needing_no_initialization (tree *vars)
2492 tree result = NULL_TREE;
2497 tree decl = TREE_VALUE (t);
2498 tree init = TREE_PURPOSE (t);
2500 /* Deal gracefully with error. */
2501 if (decl == error_mark_node)
2503 var = &TREE_CHAIN (t);
2507 /* The only things that can be initialized are variables. */
2508 gcc_assert (TREE_CODE (decl) == VAR_DECL);
2510 /* If this object is not defined, we don't need to do anything
2512 if (DECL_EXTERNAL (decl))
2514 var = &TREE_CHAIN (t);
2518 /* Also, if the initializer already contains errors, we can bail
2520 if (init && TREE_CODE (init) == TREE_LIST
2521 && value_member (error_mark_node, init))
2523 var = &TREE_CHAIN (t);
2527 /* This variable is going to need initialization and/or
2528 finalization, so we add it to the list. */
2529 *var = TREE_CHAIN (t);
2530 TREE_CHAIN (t) = result;
2537 /* Make sure we have told the back end about all the variables in
2541 write_out_vars (tree vars)
2545 for (v = vars; v; v = TREE_CHAIN (v))
2547 tree var = TREE_VALUE (v);
2548 if (!var_finalized_p (var))
2550 import_export_decl (var);
2551 rest_of_decl_compilation (var, 1, 1);
2556 /* Generate a static constructor (if CONSTRUCTOR_P) or destructor
2557 (otherwise) that will initialize all gobal objects with static
2558 storage duration having the indicated PRIORITY. */
2561 generate_ctor_or_dtor_function (bool constructor_p, int priority,
2570 input_location = *locus;
2571 #ifdef USE_MAPPED_LOCATION
2577 /* We use `I' to indicate initialization and `D' to indicate
2579 function_key = constructor_p ? 'I' : 'D';
2581 /* We emit the function lazily, to avoid generating empty
2582 global constructors and destructors. */
2585 /* Call the static storage duration function with appropriate
2588 for (i = 0; i < ssdf_decls->elements_used; ++i)
2590 fndecl = VARRAY_TREE (ssdf_decls, i);
2592 /* Calls to pure or const functions will expand to nothing. */
2593 if (! (flags_from_decl_or_type (fndecl) & (ECF_CONST | ECF_PURE)))
2596 body = start_objects (function_key, priority);
2598 arguments = tree_cons (NULL_TREE,
2599 build_int_cst (NULL_TREE, priority),
2601 arguments = tree_cons (NULL_TREE,
2602 build_int_cst (NULL_TREE, constructor_p),
2604 finish_expr_stmt (build_function_call (fndecl, arguments));
2608 /* If we're generating code for the DEFAULT_INIT_PRIORITY, throw in
2609 calls to any functions marked with attributes indicating that
2610 they should be called at initialization- or destruction-time. */
2611 if (priority == DEFAULT_INIT_PRIORITY)
2615 for (fns = constructor_p ? static_ctors : static_dtors;
2617 fns = TREE_CHAIN (fns))
2619 fndecl = TREE_VALUE (fns);
2621 /* Calls to pure/const functions will expand to nothing. */
2622 if (! (flags_from_decl_or_type (fndecl) & (ECF_CONST | ECF_PURE)))
2625 body = start_objects (function_key, priority);
2626 finish_expr_stmt (build_function_call (fndecl, NULL_TREE));
2631 /* Close out the function. */
2633 finish_objects (function_key, priority, body);
2636 /* Generate constructor and destructor functions for the priority
2640 generate_ctor_and_dtor_functions_for_priority (splay_tree_node n, void * data)
2642 location_t *locus = data;
2643 int priority = (int) n->key;
2644 priority_info pi = (priority_info) n->value;
2646 /* Generate the functions themselves, but only if they are really
2648 if (pi->initializations_p
2649 || (priority == DEFAULT_INIT_PRIORITY && static_ctors))
2650 generate_ctor_or_dtor_function (/*constructor_p=*/true, priority, locus);
2651 if (pi->destructions_p
2652 || (priority == DEFAULT_INIT_PRIORITY && static_dtors))
2653 generate_ctor_or_dtor_function (/*constructor_p=*/false, priority, locus);
2655 /* Keep iterating. */
2659 /* Called via LANGHOOK_CALLGRAPH_ANALYZE_EXPR. It is supposed to mark
2660 decls referenced from frontend specific constructs; it will be called
2661 only for language-specific tree nodes.
2663 Here we must deal with member pointers. */
2666 cxx_callgraph_analyze_expr (tree *tp, int *walk_subtrees ATTRIBUTE_UNUSED,
2667 tree from ATTRIBUTE_UNUSED)
2671 switch (TREE_CODE (t))
2674 if (TYPE_PTRMEMFUNC_P (TREE_TYPE (t)))
2675 cgraph_mark_needed_node (cgraph_node (PTRMEM_CST_MEMBER (t)));
2678 if (TREE_CODE (BASELINK_FUNCTIONS (t)) == FUNCTION_DECL)
2679 cgraph_mark_needed_node (cgraph_node (BASELINK_FUNCTIONS (t)));
2682 if (DECL_VTABLE_OR_VTT_P (t))
2684 /* The ABI requires that all virtual tables be emitted
2685 whenever one of them is. */
2687 for (vtbl = CLASSTYPE_VTABLES (DECL_CONTEXT (t));
2689 vtbl = TREE_CHAIN (vtbl))
2690 mark_decl_referenced (vtbl);
2692 else if (DECL_CONTEXT (t)
2693 && TREE_CODE (DECL_CONTEXT (t)) == FUNCTION_DECL)
2694 /* If we need a static variable in a function, then we
2695 need the containing function. */
2696 mark_decl_referenced (DECL_CONTEXT (t));
2705 /* This routine is called from the last rule in yyparse ().
2706 Its job is to create all the code needed to initialize and
2707 destroy the global aggregates. We do the destruction
2708 first, since that way we only need to reverse the decls once. */
2717 unsigned ssdf_count = 0;
2720 locus = input_location;
2723 /* Bad parse errors. Just forget about it. */
2724 if (! global_bindings_p () || current_class_type || decl_namespace_list)
2728 c_common_write_pch ();
2730 #ifdef USE_MAPPED_LOCATION
2733 /* Otherwise, GDB can get confused, because in only knows
2734 about source for LINENO-1 lines. */
2738 interface_unknown = 1;
2741 /* We now have to write out all the stuff we put off writing out.
2744 o Template specializations that we have not yet instantiated,
2745 but which are needed.
2746 o Initialization and destruction for non-local objects with
2747 static storage duration. (Local objects with static storage
2748 duration are initialized when their scope is first entered,
2749 and are cleaned up via atexit.)
2750 o Virtual function tables.
2752 All of these may cause others to be needed. For example,
2753 instantiating one function may cause another to be needed, and
2754 generating the initializer for an object may cause templates to be
2755 instantiated, etc., etc. */
2757 timevar_push (TV_VARCONST);
2759 emit_support_tinfos ();
2764 size_t n_old, n_new;
2768 /* If there are templates that we've put off instantiating, do
2770 instantiate_pending_templates (retries);
2773 /* Write out virtual tables as required. Note that writing out
2774 the virtual table for a template class may cause the
2775 instantiation of members of that class. If we write out
2776 vtables then we remove the class from our list so we don't
2777 have to look at it again. */
2779 while (keyed_classes != NULL_TREE
2780 && maybe_emit_vtables (TREE_VALUE (keyed_classes)))
2783 keyed_classes = TREE_CHAIN (keyed_classes);
2789 tree next = TREE_CHAIN (t);
2793 if (maybe_emit_vtables (TREE_VALUE (next)))
2796 TREE_CHAIN (t) = TREE_CHAIN (next);
2801 next = TREE_CHAIN (t);
2805 /* Write out needed type info variables. We have to be careful
2806 looping through unemitted decls, because emit_tinfo_decl may
2807 cause other variables to be needed. We stick new elements
2808 (and old elements that we may need to reconsider) at the end
2809 of the array, then shift them back to the beginning once we're
2812 n_old = VARRAY_ACTIVE_SIZE (unemitted_tinfo_decls);
2813 for (i = 0; i < n_old; ++i)
2815 tree tinfo_decl = VARRAY_TREE (unemitted_tinfo_decls, i);
2816 if (emit_tinfo_decl (tinfo_decl))
2819 VARRAY_PUSH_TREE (unemitted_tinfo_decls, tinfo_decl);
2822 /* The only elements we want to keep are the new ones. Copy
2823 them to the beginning of the array, then get rid of the
2825 n_new = VARRAY_ACTIVE_SIZE (unemitted_tinfo_decls) - n_old;
2827 memmove (&VARRAY_TREE (unemitted_tinfo_decls, 0),
2828 &VARRAY_TREE (unemitted_tinfo_decls, n_old),
2829 n_new * sizeof (tree));
2830 memset (&VARRAY_TREE (unemitted_tinfo_decls, n_new),
2831 0, n_old * sizeof (tree));
2832 VARRAY_ACTIVE_SIZE (unemitted_tinfo_decls) = n_new;
2834 /* The list of objects with static storage duration is built up
2835 in reverse order. We clear STATIC_AGGREGATES so that any new
2836 aggregates added during the initialization of these will be
2837 initialized in the correct order when we next come around the
2839 vars = prune_vars_needing_no_initialization (&static_aggregates);
2845 /* We need to start a new initialization function each time
2846 through the loop. That's because we need to know which
2847 vtables have been referenced, and TREE_SYMBOL_REFERENCED
2848 isn't computed until a function is finished, and written
2849 out. That's a deficiency in the back-end. When this is
2850 fixed, these initialization functions could all become
2851 inline, with resulting performance improvements. */
2854 /* Set the line and file, so that it is obviously not from
2856 input_location = locus;
2857 ssdf_body = start_static_storage_duration_function (ssdf_count);
2859 /* Make sure the back end knows about all the variables. */
2860 write_out_vars (vars);
2862 /* First generate code to do all the initializations. */
2863 for (v = vars; v; v = TREE_CHAIN (v))
2864 do_static_initialization (TREE_VALUE (v),
2867 /* Then, generate code to do all the destructions. Do these
2868 in reverse order so that the most recently constructed
2869 variable is the first destroyed. If we're using
2870 __cxa_atexit, then we don't need to do this; functions
2871 were registered at initialization time to destroy the
2873 if (!flag_use_cxa_atexit)
2875 vars = nreverse (vars);
2876 for (v = vars; v; v = TREE_CHAIN (v))
2877 do_static_destruction (TREE_VALUE (v));
2882 /* Finish up the static storage duration function for this
2884 input_location = locus;
2885 finish_static_storage_duration_function (ssdf_body);
2887 /* All those initializations and finalizations might cause
2888 us to need more inline functions, more template
2889 instantiations, etc. */
2892 #ifdef USE_MAPPED_LOCATION
2899 /* Go through the set of inline functions whose bodies have not
2900 been emitted yet. If out-of-line copies of these functions
2901 are required, emit them. */
2902 for (i = 0; i < deferred_fns_used; ++i)
2904 tree decl = VARRAY_TREE (deferred_fns, i);
2906 /* Does it need synthesizing? */
2907 if (DECL_ARTIFICIAL (decl) && ! DECL_INITIAL (decl)
2908 && (! DECL_REALLY_EXTERN (decl) || DECL_INLINE (decl)))
2910 /* Even though we're already at the top-level, we push
2911 there again. That way, when we pop back a few lines
2912 hence, all of our state is restored. Otherwise,
2913 finish_function doesn't clean things up, and we end
2914 up with CURRENT_FUNCTION_DECL set. */
2915 push_to_top_level ();
2916 synthesize_method (decl);
2917 pop_from_top_level ();
2921 if (!DECL_SAVED_TREE (decl))
2924 import_export_decl (decl);
2926 /* We lie to the back-end, pretending that some functions
2927 are not defined when they really are. This keeps these
2928 functions from being put out unnecessarily. But, we must
2929 stop lying when the functions are referenced, or if they
2930 are not comdat since they need to be put out now. This
2931 is done in a separate for cycle, because if some deferred
2932 function is contained in another deferred function later
2933 in deferred_fns varray, rest_of_compilation would skip
2934 this function and we really cannot expand the same
2936 if (DECL_NOT_REALLY_EXTERN (decl)
2937 && DECL_INITIAL (decl)
2938 && decl_needed_p (decl))
2939 DECL_EXTERNAL (decl) = 0;
2941 /* If we're going to need to write this function out, and
2942 there's already a body for it, create RTL for it now.
2943 (There might be no body if this is a method we haven't
2944 gotten around to synthesizing yet.) */
2945 if (!DECL_EXTERNAL (decl)
2946 && decl_needed_p (decl)
2947 && !TREE_ASM_WRITTEN (decl)
2948 && !cgraph_node (decl)->local.finalized)
2950 /* We will output the function; no longer consider it in this
2952 DECL_DEFER_OUTPUT (decl) = 0;
2953 /* Generate RTL for this function now that we know we
2955 expand_or_defer_fn (decl);
2956 /* If we're compiling -fsyntax-only pretend that this
2957 function has been written out so that we don't try to
2959 if (flag_syntax_only)
2960 TREE_ASM_WRITTEN (decl) = 1;
2965 if (walk_namespaces (wrapup_globals_for_namespace, /*data=*/0))
2968 /* Static data members are just like namespace-scope globals. */
2969 for (i = 0; i < pending_statics_used; ++i)
2971 tree decl = VARRAY_TREE (pending_statics, i);
2972 if (var_finalized_p (decl) || DECL_REALLY_EXTERN (decl))
2974 import_export_decl (decl);
2975 /* If this static data member is needed, provide it to the
2977 if (DECL_NOT_REALLY_EXTERN (decl) && decl_needed_p (decl))
2978 DECL_EXTERNAL (decl) = 0;
2981 && wrapup_global_declarations (&VARRAY_TREE (pending_statics, 0),
2982 pending_statics_used))
2985 /* Ask the back end to emit functions and variables that are
2986 enqued. These emissions may result in marking more entities
2988 if (cgraph_assemble_pending_functions ())
2990 if (cgraph_varpool_assemble_pending_decls ())
2997 /* All used inline functions must have a definition at this point. */
2998 for (i = 0; i < deferred_fns_used; ++i)
3000 tree decl = VARRAY_TREE (deferred_fns, i);
3002 if (/* Check online inline functions that were actually used. */
3003 TREE_USED (decl) && DECL_DECLARED_INLINE_P (decl)
3004 /* But not defined. */
3005 && DECL_REALLY_EXTERN (decl)
3006 /* If we decided to emit this function in another
3007 translation unit, the fact that the definition was
3008 missing here likely indicates only that the repository
3009 decided to place the function elsewhere. With -Winline,
3010 we will still warn if we could not inline the
3012 && !flag_use_repository
3013 /* An explicit instantiation can be used to specify
3014 that the body is in another unit. It will have
3015 already verified there was a definition. */
3016 && !DECL_EXPLICIT_INSTANTIATION (decl))
3018 cp_warning_at ("inline function `%D' used but never defined", decl);
3019 /* This symbol is effectively an "extern" declaration now.
3020 This is not strictly necessary, but removes a duplicate
3022 TREE_PUBLIC (decl) = 1;
3026 /* We give C linkage to static constructors and destructors. */
3027 push_lang_context (lang_name_c);
3029 /* Generate initialization and destruction functions for all
3030 priorities for which they are required. */
3031 if (priority_info_map)
3032 splay_tree_foreach (priority_info_map,
3033 generate_ctor_and_dtor_functions_for_priority,
3039 generate_ctor_or_dtor_function (/*constructor_p=*/true,
3040 DEFAULT_INIT_PRIORITY, &locus);
3042 generate_ctor_or_dtor_function (/*constructor_p=*/false,
3043 DEFAULT_INIT_PRIORITY, &locus);
3046 /* We're done with the splay-tree now. */
3047 if (priority_info_map)
3048 splay_tree_delete (priority_info_map);
3050 /* We're done with static constructors, so we can go back to "C++"
3052 pop_lang_context ();
3054 cgraph_finalize_compilation_unit ();
3057 /* Emit mudflap static registration function. This must be done
3058 after all the user functions have been expanded. */
3060 mudflap_finish_file ();
3062 /* Now, issue warnings about static, but not defined, functions,
3063 etc., and emit debugging information. */
3064 walk_namespaces (wrapup_globals_for_namespace, /*data=*/&reconsider);
3065 if (pending_statics)
3066 check_global_declarations (&VARRAY_TREE (pending_statics, 0),
3067 pending_statics_used);
3071 /* The entire file is now complete. If requested, dump everything
3075 FILE *stream = dump_begin (TDI_tu, &flags);
3079 dump_node (global_namespace, flags & ~TDF_SLIM, stream);
3080 dump_end (TDI_tu, stream);
3084 timevar_pop (TV_VARCONST);
3086 if (flag_detailed_statistics)
3088 dump_tree_statistics ();
3089 dump_time_statistics ();
3091 input_location = locus;
3093 #ifdef ENABLE_CHECKING
3094 validate_conversion_obstack ();
3095 #endif /* ENABLE_CHECKING */
3098 /* FN is an OFFSET_REF, DOTSTAR_EXPR or MEMBER_REF indicating the
3099 function to call in parse-tree form; it has not yet been
3100 semantically analyzed. ARGS are the arguments to the function.
3101 They have already been semantically analyzed. */
3104 build_offset_ref_call_from_tree (tree fn, tree args)
3113 object = TREE_OPERAND (fn, 0);
3115 if (processing_template_decl)
3117 gcc_assert (TREE_CODE (fn) == DOTSTAR_EXPR
3118 || TREE_CODE (fn) == MEMBER_REF);
3119 if (type_dependent_expression_p (fn)
3120 || any_type_dependent_arguments_p (args))
3121 return build_min_nt (CALL_EXPR, fn, args, NULL_TREE);
3123 /* Transform the arguments and add the implicit "this"
3124 parameter. That must be done before the FN is transformed
3125 because we depend on the form of FN. */
3126 args = build_non_dependent_args (args);
3127 if (TREE_CODE (fn) == DOTSTAR_EXPR)
3128 object = build_unary_op (ADDR_EXPR, object, 0);
3129 object = build_non_dependent_expr (object);
3130 args = tree_cons (NULL_TREE, object, args);
3131 /* Now that the arguments are done, transform FN. */
3132 fn = build_non_dependent_expr (fn);
3135 /* A qualified name corresponding to a bound pointer-to-member is
3136 represented as an OFFSET_REF:
3138 struct B { void g(); };
3140 void B::g() { (this->*p)(); } */
3141 if (TREE_CODE (fn) == OFFSET_REF)
3143 tree object_addr = build_unary_op (ADDR_EXPR, object, 0);
3144 fn = TREE_OPERAND (fn, 1);
3145 fn = get_member_function_from_ptrfunc (&object_addr, fn);
3146 args = tree_cons (NULL_TREE, object_addr, args);
3149 expr = build_function_call (fn, args);
3150 if (processing_template_decl && expr != error_mark_node)
3151 return build_min_non_dep (CALL_EXPR, expr, orig_fn, orig_args, NULL_TREE);
3157 check_default_args (tree x)
3159 tree arg = TYPE_ARG_TYPES (TREE_TYPE (x));
3160 bool saw_def = false;
3161 int i = 0 - (TREE_CODE (TREE_TYPE (x)) == METHOD_TYPE);
3162 for (; arg && arg != void_list_node; arg = TREE_CHAIN (arg), ++i)
3164 if (TREE_PURPOSE (arg))
3168 cp_error_at ("default argument missing for parameter %P of `%+#D'",
3176 mark_used (tree decl)
3178 TREE_USED (decl) = 1;
3179 if (processing_template_decl || skip_evaluation)
3182 if (TREE_CODE (decl) == FUNCTION_DECL && DECL_DECLARED_INLINE_P (decl)
3183 && !TREE_ASM_WRITTEN (decl))
3184 /* Remember it, so we can check it was defined. */
3186 if (DECL_DEFERRED_FN (decl))
3188 note_vague_linkage_fn (decl);
3191 assemble_external (decl);
3193 /* Is it a synthesized method that needs to be synthesized? */
3194 if (TREE_CODE (decl) == FUNCTION_DECL
3195 && DECL_NONSTATIC_MEMBER_FUNCTION_P (decl)
3196 && DECL_ARTIFICIAL (decl)
3197 && !DECL_THUNK_P (decl)
3198 && ! DECL_INITIAL (decl)
3199 /* Kludge: don't synthesize for default args. */
3200 && current_function_decl)
3202 synthesize_method (decl);
3203 /* If we've already synthesized the method we don't need to
3204 instantiate it, so we can return right away. */
3208 /* If this is a function or variable that is an instance of some
3209 template, we now know that we will need to actually do the
3210 instantiation. We check that DECL is not an explicit
3211 instantiation because that is not checked in instantiate_decl. */
3212 if ((DECL_NON_THUNK_FUNCTION_P (decl) || TREE_CODE (decl) == VAR_DECL)
3213 && DECL_LANG_SPECIFIC (decl) && DECL_TEMPLATE_INFO (decl)
3214 && (!DECL_EXPLICIT_INSTANTIATION (decl)
3215 || (TREE_CODE (decl) == FUNCTION_DECL
3216 && DECL_INLINE (DECL_TEMPLATE_RESULT
3217 (template_for_substitution (decl))))))
3218 /* We put off instantiating functions in order to improve compile
3219 times. Maintaining a stack of active functions is expensive,
3220 and the inliner knows to instantiate any functions it might
3222 instantiate_decl (decl, /*defer_ok=*/true, /*undefined_ok=*/0);
3225 #include "gt-cp-decl2.h"