1 /* Process declarations and variables for C++ compiler.
2 Copyright (C) 1988, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
3 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2007, 2008, 2009
4 Free Software Foundation, Inc.
5 Hacked by Michael Tiemann (tiemann@cygnus.com)
7 This file is part of GCC.
9 GCC is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 3, or (at your option)
14 GCC is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
19 You should have received a copy of the GNU General Public License
20 along with GCC; see the file COPYING3. If not see
21 <http://www.gnu.org/licenses/>. */
24 /* Process declarations and symbol lookup for C++ front end.
25 Also constructs types; the standard scalar types at initialization,
26 and structure, union, array and enum types when they are declared. */
28 /* ??? not all decl nodes are given the most useful possible
29 line numbers. For example, the CONST_DECLs for enum values. */
33 #include "coretypes.h"
48 #include "tree-mudflap.h"
50 #include "tree-inline.h"
52 #include "tree-dump.h"
56 extern cpp_reader *parse_in;
58 /* This structure contains information about the initializations
59 and/or destructions required for a particular priority level. */
60 typedef struct priority_info_s {
61 /* Nonzero if there have been any initializations at this priority
62 throughout the translation unit. */
63 int initializations_p;
64 /* Nonzero if there have been any destructions at this priority
65 throughout the translation unit. */
69 static void mark_vtable_entries (tree);
70 static bool maybe_emit_vtables (tree);
71 static bool acceptable_java_type (tree);
72 static tree start_objects (int, int);
73 static void finish_objects (int, int, tree);
74 static tree start_static_storage_duration_function (unsigned);
75 static void finish_static_storage_duration_function (tree);
76 static priority_info get_priority_info (int);
77 static void do_static_initialization_or_destruction (tree, bool);
78 static void one_static_initialization_or_destruction (tree, tree, bool);
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);
86 static void determine_visibility_from_class (tree, tree);
88 /* A list of static class variables. This is needed, because a
89 static class variable can be declared inside the class without
90 an initializer, and then initialized, statically, outside the class. */
91 static GTY(()) VEC(tree,gc) *pending_statics;
93 /* A list of functions which were declared inline, but which we
94 may need to emit outline anyway. */
95 static GTY(()) VEC(tree,gc) *deferred_fns;
97 /* Nonzero if we're done parsing and into end-of-file activities. */
103 /* Return a member function type (a METHOD_TYPE), given FNTYPE (a
104 FUNCTION_TYPE), CTYPE (class type), and QUALS (the cv-qualifiers
105 that apply to the function). */
108 build_memfn_type (tree fntype, tree ctype, cp_cv_quals quals)
113 if (fntype == error_mark_node || ctype == error_mark_node)
114 return error_mark_node;
116 type_quals = quals & ~TYPE_QUAL_RESTRICT;
117 ctype = cp_build_qualified_type (ctype, type_quals);
118 fntype = build_method_type_directly (ctype, TREE_TYPE (fntype),
119 (TREE_CODE (fntype) == METHOD_TYPE
120 ? TREE_CHAIN (TYPE_ARG_TYPES (fntype))
121 : TYPE_ARG_TYPES (fntype)));
122 raises = TYPE_RAISES_EXCEPTIONS (fntype);
124 fntype = build_exception_variant (fntype, raises);
129 /* Build a PARM_DECL with NAME and TYPE, and set DECL_ARG_TYPE
133 cp_build_parm_decl (tree name, tree type)
135 tree parm = build_decl (input_location,
136 PARM_DECL, name, type);
137 /* DECL_ARG_TYPE is only used by the back end and the back end never
139 if (!processing_template_decl)
140 DECL_ARG_TYPE (parm) = type_passed_as (type);
142 /* If the type is a pack expansion, then we have a function
144 if (type && TREE_CODE (type) == TYPE_PACK_EXPANSION)
145 FUNCTION_PARAMETER_PACK_P (parm) = 1;
150 /* Returns a PARM_DECL for a parameter of the indicated TYPE, with the
154 build_artificial_parm (tree name, tree type)
156 tree parm = cp_build_parm_decl (name, type);
157 DECL_ARTIFICIAL (parm) = 1;
158 /* All our artificial parms are implicitly `const'; they cannot be
160 TREE_READONLY (parm) = 1;
164 /* Constructors for types with virtual baseclasses need an "in-charge" flag
165 saying whether this constructor is responsible for initialization of
166 virtual baseclasses or not. All destructors also need this "in-charge"
167 flag, which additionally determines whether or not the destructor should
168 free the memory for the object.
170 This function adds the "in-charge" flag to member function FN if
171 appropriate. It is called from grokclassfn and tsubst.
172 FN must be either a constructor or destructor.
174 The in-charge flag follows the 'this' parameter, and is followed by the
175 VTT parm (if any), then the user-written parms. */
178 maybe_retrofit_in_chrg (tree fn)
180 tree basetype, arg_types, parms, parm, fntype;
182 /* If we've already add the in-charge parameter don't do it again. */
183 if (DECL_HAS_IN_CHARGE_PARM_P (fn))
186 /* When processing templates we can't know, in general, whether or
187 not we're going to have virtual baseclasses. */
188 if (processing_template_decl)
191 /* We don't need an in-charge parameter for constructors that don't
192 have virtual bases. */
193 if (DECL_CONSTRUCTOR_P (fn)
194 && !CLASSTYPE_VBASECLASSES (DECL_CONTEXT (fn)))
197 arg_types = TYPE_ARG_TYPES (TREE_TYPE (fn));
198 basetype = TREE_TYPE (TREE_VALUE (arg_types));
199 arg_types = TREE_CHAIN (arg_types);
201 parms = TREE_CHAIN (DECL_ARGUMENTS (fn));
203 /* If this is a subobject constructor or destructor, our caller will
204 pass us a pointer to our VTT. */
205 if (CLASSTYPE_VBASECLASSES (DECL_CONTEXT (fn)))
207 parm = build_artificial_parm (vtt_parm_identifier, vtt_parm_type);
209 /* First add it to DECL_ARGUMENTS between 'this' and the real args... */
210 TREE_CHAIN (parm) = parms;
213 /* ...and then to TYPE_ARG_TYPES. */
214 arg_types = hash_tree_chain (vtt_parm_type, arg_types);
216 DECL_HAS_VTT_PARM_P (fn) = 1;
219 /* Then add the in-charge parm (before the VTT parm). */
220 parm = build_artificial_parm (in_charge_identifier, integer_type_node);
221 TREE_CHAIN (parm) = parms;
223 arg_types = hash_tree_chain (integer_type_node, arg_types);
225 /* Insert our new parameter(s) into the list. */
226 TREE_CHAIN (DECL_ARGUMENTS (fn)) = parms;
228 /* And rebuild the function type. */
229 fntype = build_method_type_directly (basetype, TREE_TYPE (TREE_TYPE (fn)),
231 if (TYPE_RAISES_EXCEPTIONS (TREE_TYPE (fn)))
232 fntype = build_exception_variant (fntype,
233 TYPE_RAISES_EXCEPTIONS (TREE_TYPE (fn)));
234 TREE_TYPE (fn) = fntype;
236 /* Now we've got the in-charge parameter. */
237 DECL_HAS_IN_CHARGE_PARM_P (fn) = 1;
240 /* Classes overload their constituent function names automatically.
241 When a function name is declared in a record structure,
242 its name is changed to it overloaded name. Since names for
243 constructors and destructors can conflict, we place a leading
246 CNAME is the name of the class we are grokking for.
248 FUNCTION is a FUNCTION_DECL. It was created by `grokdeclarator'.
250 FLAGS contains bits saying what's special about today's
251 arguments. 1 == DESTRUCTOR. 2 == OPERATOR.
253 If FUNCTION is a destructor, then we must add the `auto-delete' field
254 as a second parameter. There is some hair associated with the fact
255 that we must "declare" this variable in the manner consistent with the
256 way the rest of the arguments were declared.
258 QUALS are the qualifiers for the this pointer. */
261 grokclassfn (tree ctype, tree function, enum overload_flags flags)
263 tree fn_name = DECL_NAME (function);
265 /* Even within an `extern "C"' block, members get C++ linkage. See
266 [dcl.link] for details. */
267 SET_DECL_LANGUAGE (function, lang_cplusplus);
269 if (fn_name == NULL_TREE)
271 error ("name missing for member function");
272 fn_name = get_identifier ("<anonymous>");
273 DECL_NAME (function) = fn_name;
276 DECL_CONTEXT (function) = ctype;
278 if (flags == DTOR_FLAG)
279 DECL_DESTRUCTOR_P (function) = 1;
281 if (flags == DTOR_FLAG || DECL_CONSTRUCTOR_P (function))
282 maybe_retrofit_in_chrg (function);
285 /* Create an ARRAY_REF, checking for the user doing things backwards
289 grok_array_decl (tree array_expr, tree index_exp)
293 tree orig_array_expr = array_expr;
294 tree orig_index_exp = index_exp;
296 if (error_operand_p (array_expr) || error_operand_p (index_exp))
297 return error_mark_node;
299 if (processing_template_decl)
301 if (type_dependent_expression_p (array_expr)
302 || type_dependent_expression_p (index_exp))
303 return build_min_nt (ARRAY_REF, array_expr, index_exp,
304 NULL_TREE, NULL_TREE);
305 array_expr = build_non_dependent_expr (array_expr);
306 index_exp = build_non_dependent_expr (index_exp);
309 type = TREE_TYPE (array_expr);
311 type = non_reference (type);
313 /* If they have an `operator[]', use that. */
314 if (MAYBE_CLASS_TYPE_P (type) || MAYBE_CLASS_TYPE_P (TREE_TYPE (index_exp)))
315 expr = build_new_op (ARRAY_REF, LOOKUP_NORMAL,
316 array_expr, index_exp, NULL_TREE,
317 /*overloaded_p=*/NULL, tf_warning_or_error);
322 /* Otherwise, create an ARRAY_REF for a pointer or array type.
323 It is a little-known fact that, if `a' is an array and `i' is
324 an int, you can write `i[a]', which means the same thing as
326 if (TREE_CODE (type) == ARRAY_TYPE)
329 p1 = build_expr_type_conversion (WANT_POINTER, array_expr, false);
331 if (TREE_CODE (TREE_TYPE (index_exp)) == ARRAY_TYPE)
334 p2 = build_expr_type_conversion (WANT_POINTER, index_exp, false);
336 i1 = build_expr_type_conversion (WANT_INT | WANT_ENUM, array_expr,
338 i2 = build_expr_type_conversion (WANT_INT | WANT_ENUM, index_exp,
341 if ((p1 && i2) && (i1 && p2))
342 error ("ambiguous conversion for array subscript");
345 array_expr = p1, index_exp = i2;
347 array_expr = p2, index_exp = i1;
350 error ("invalid types %<%T[%T]%> for array subscript",
351 type, TREE_TYPE (index_exp));
352 return error_mark_node;
355 if (array_expr == error_mark_node || index_exp == error_mark_node)
356 error ("ambiguous conversion for array subscript");
358 expr = build_array_ref (input_location, array_expr, index_exp);
360 if (processing_template_decl && expr != error_mark_node)
361 return build_min_non_dep (ARRAY_REF, expr, orig_array_expr, orig_index_exp,
362 NULL_TREE, NULL_TREE);
366 /* Given the cast expression EXP, checking out its validity. Either return
367 an error_mark_node if there was an unavoidable error, return a cast to
368 void for trying to delete a pointer w/ the value 0, or return the
369 call to delete. If DOING_VEC is true, we handle things differently
370 for doing an array delete.
371 Implements ARM $5.3.4. This is called from the parser. */
374 delete_sanity (tree exp, tree size, bool doing_vec, int use_global_delete)
378 if (exp == error_mark_node)
381 if (processing_template_decl)
383 t = build_min (DELETE_EXPR, void_type_node, exp, size);
384 DELETE_EXPR_USE_GLOBAL (t) = use_global_delete;
385 DELETE_EXPR_USE_VEC (t) = doing_vec;
386 TREE_SIDE_EFFECTS (t) = 1;
390 /* An array can't have been allocated by new, so complain. */
391 if (TREE_CODE (exp) == VAR_DECL
392 && TREE_CODE (TREE_TYPE (exp)) == ARRAY_TYPE)
393 warning (0, "deleting array %q#D", exp);
395 t = build_expr_type_conversion (WANT_POINTER, exp, true);
397 if (t == NULL_TREE || t == error_mark_node)
399 error ("type %q#T argument given to %<delete%>, expected pointer",
401 return error_mark_node;
404 type = TREE_TYPE (t);
406 /* As of Valley Forge, you can delete a pointer to const. */
408 /* You can't delete functions. */
409 if (TREE_CODE (TREE_TYPE (type)) == FUNCTION_TYPE)
411 error ("cannot delete a function. Only pointer-to-objects are "
412 "valid arguments to %<delete%>");
413 return error_mark_node;
416 /* Deleting ptr to void is undefined behavior [expr.delete/3]. */
417 if (TREE_CODE (TREE_TYPE (type)) == VOID_TYPE)
419 warning (0, "deleting %qT is undefined", type);
423 /* Deleting a pointer with the value zero is valid and has no effect. */
424 if (integer_zerop (t))
425 return build1 (NOP_EXPR, void_type_node, t);
428 return build_vec_delete (t, /*maxindex=*/NULL_TREE,
429 sfk_deleting_destructor,
432 return build_delete (type, t, sfk_deleting_destructor,
433 LOOKUP_NORMAL, use_global_delete);
436 /* Report an error if the indicated template declaration is not the
437 sort of thing that should be a member template. */
440 check_member_template (tree tmpl)
444 gcc_assert (TREE_CODE (tmpl) == TEMPLATE_DECL);
445 decl = DECL_TEMPLATE_RESULT (tmpl);
447 if (TREE_CODE (decl) == FUNCTION_DECL
448 || (TREE_CODE (decl) == TYPE_DECL
449 && MAYBE_CLASS_TYPE_P (TREE_TYPE (decl))))
451 /* The parser rejects template declarations in local classes. */
452 gcc_assert (!current_function_decl);
453 /* The parser rejects any use of virtual in a function template. */
454 gcc_assert (!(TREE_CODE (decl) == FUNCTION_DECL
455 && DECL_VIRTUAL_P (decl)));
457 /* The debug-information generating code doesn't know what to do
458 with member templates. */
459 DECL_IGNORED_P (tmpl) = 1;
462 error ("template declaration of %q#D", decl);
465 /* Return true iff TYPE is a valid Java parameter or return type. */
468 acceptable_java_type (tree type)
470 if (type == error_mark_node)
473 if (TREE_CODE (type) == VOID_TYPE || TYPE_FOR_JAVA (type))
475 if (TREE_CODE (type) == POINTER_TYPE || TREE_CODE (type) == REFERENCE_TYPE)
477 type = TREE_TYPE (type);
478 if (TREE_CODE (type) == RECORD_TYPE)
481 if (! TYPE_FOR_JAVA (type))
483 if (! CLASSTYPE_TEMPLATE_INFO (type))
485 args = CLASSTYPE_TI_ARGS (type);
486 i = TREE_VEC_LENGTH (args);
489 type = TREE_VEC_ELT (args, i);
490 if (TREE_CODE (type) == POINTER_TYPE)
491 type = TREE_TYPE (type);
492 if (! TYPE_FOR_JAVA (type))
501 /* For a METHOD in a Java class CTYPE, return true if
502 the parameter and return types are valid Java types.
503 Otherwise, print appropriate error messages, and return false. */
506 check_java_method (tree method)
509 tree arg_types = TYPE_ARG_TYPES (TREE_TYPE (method));
510 tree ret_type = TREE_TYPE (TREE_TYPE (method));
512 if (!acceptable_java_type (ret_type))
514 error ("Java method %qD has non-Java return type %qT",
519 arg_types = TREE_CHAIN (arg_types);
520 if (DECL_HAS_IN_CHARGE_PARM_P (method))
521 arg_types = TREE_CHAIN (arg_types);
522 if (DECL_HAS_VTT_PARM_P (method))
523 arg_types = TREE_CHAIN (arg_types);
525 for (; arg_types != NULL_TREE; arg_types = TREE_CHAIN (arg_types))
527 tree type = TREE_VALUE (arg_types);
528 if (!acceptable_java_type (type))
530 if (type != error_mark_node)
531 error ("Java method %qD has non-Java parameter type %qT",
539 /* Sanity check: report error if this function FUNCTION is not
540 really a member of the class (CTYPE) it is supposed to belong to.
541 TEMPLATE_PARMS is used to specify the template parameters of a member
542 template passed as FUNCTION_DECL. If the member template is passed as a
543 TEMPLATE_DECL, it can be NULL since the parameters can be extracted
544 from the declaration. If the function is not a function template, it
546 It returns the original declaration for the function, NULL_TREE if
547 no declaration was found, error_mark_node if an error was emitted. */
550 check_classfn (tree ctype, tree function, tree template_parms)
556 if (DECL_USE_TEMPLATE (function)
557 && !(TREE_CODE (function) == TEMPLATE_DECL
558 && DECL_TEMPLATE_SPECIALIZATION (function))
559 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (function)))
560 /* Since this is a specialization of a member template,
561 we're not going to find the declaration in the class.
564 struct S { template <typename T> void f(T); };
565 template <> void S::f(int);
567 we're not going to find `S::f(int)', but there's no
568 reason we should, either. We let our callers know we didn't
569 find the method, but we don't complain. */
572 /* Basic sanity check: for a template function, the template parameters
573 either were not passed, or they are the same of DECL_TEMPLATE_PARMS. */
574 if (TREE_CODE (function) == TEMPLATE_DECL)
577 && !comp_template_parms (template_parms,
578 DECL_TEMPLATE_PARMS (function)))
580 error ("template parameter lists provided don't match the "
581 "template parameters of %qD", function);
582 return error_mark_node;
584 template_parms = DECL_TEMPLATE_PARMS (function);
587 /* OK, is this a definition of a member template? */
588 is_template = (template_parms != NULL_TREE);
590 /* We must enter the scope here, because conversion operators are
591 named by target type, and type equivalence relies on typenames
592 resolving within the scope of CTYPE. */
593 pushed_scope = push_scope (ctype);
594 ix = class_method_index_for_fn (complete_type (ctype), function);
597 VEC(tree,gc) *methods = CLASSTYPE_METHOD_VEC (ctype);
598 tree fndecls, fndecl = 0;
600 const char *format = NULL;
602 for (fndecls = VEC_index (tree, methods, ix);
603 fndecls; fndecls = OVL_NEXT (fndecls))
607 fndecl = OVL_CURRENT (fndecls);
608 p1 = TYPE_ARG_TYPES (TREE_TYPE (function));
609 p2 = TYPE_ARG_TYPES (TREE_TYPE (fndecl));
611 /* We cannot simply call decls_match because this doesn't
612 work for static member functions that are pretending to
613 be methods, and because the name may have been changed by
616 /* Get rid of the this parameter on functions that become
618 if (DECL_STATIC_FUNCTION_P (fndecl)
619 && TREE_CODE (TREE_TYPE (function)) == METHOD_TYPE)
620 p1 = TREE_CHAIN (p1);
622 /* A member template definition only matches a member template
624 if (is_template != (TREE_CODE (fndecl) == TEMPLATE_DECL))
627 if (same_type_p (TREE_TYPE (TREE_TYPE (function)),
628 TREE_TYPE (TREE_TYPE (fndecl)))
629 && compparms (p1, p2)
631 || comp_template_parms (template_parms,
632 DECL_TEMPLATE_PARMS (fndecl)))
633 && (DECL_TEMPLATE_SPECIALIZATION (function)
634 == DECL_TEMPLATE_SPECIALIZATION (fndecl))
635 && (!DECL_TEMPLATE_SPECIALIZATION (function)
636 || (DECL_TI_TEMPLATE (function)
637 == DECL_TI_TEMPLATE (fndecl))))
643 pop_scope (pushed_scope);
644 return OVL_CURRENT (fndecls);
647 error_at (DECL_SOURCE_LOCATION (function),
648 "prototype for %q#D does not match any in class %qT",
650 is_conv_op = DECL_CONV_FN_P (fndecl);
653 ix = CLASSTYPE_FIRST_CONVERSION_SLOT;
654 fndecls = VEC_index (tree, methods, ix);
657 fndecl = OVL_CURRENT (fndecls);
658 fndecls = OVL_NEXT (fndecls);
660 if (!fndecls && is_conv_op)
662 if (VEC_length (tree, methods) > (size_t) ++ix)
664 fndecls = VEC_index (tree, methods, ix);
665 if (!DECL_CONV_FN_P (OVL_CURRENT (fndecls)))
677 format = N_("candidates are: %+#D");
679 format = N_("candidate is: %+#D");
680 error (format, fndecl);
683 else if (!COMPLETE_TYPE_P (ctype))
684 cxx_incomplete_type_error (function, ctype);
686 error ("no %q#D member function declared in class %qT",
690 pop_scope (pushed_scope);
691 return error_mark_node;
694 /* DECL is a function with vague linkage. Remember it so that at the
695 end of the translation unit we can decide whether or not to emit
699 note_vague_linkage_fn (tree decl)
701 if (!DECL_DEFERRED_FN (decl))
703 DECL_DEFERRED_FN (decl) = 1;
704 DECL_DEFER_OUTPUT (decl) = 1;
705 VEC_safe_push (tree, gc, deferred_fns, decl);
709 /* We have just processed the DECL, which is a static data member.
710 The other parameters are as for cp_finish_decl. */
713 finish_static_data_member_decl (tree decl,
714 tree init, bool init_const_expr_p,
718 DECL_CONTEXT (decl) = current_class_type;
720 /* We cannot call pushdecl here, because that would fill in the
721 TREE_CHAIN of our decl. Instead, we modify cp_finish_decl to do
722 the right thing, namely, to put this decl out straight away. */
724 if (! processing_template_decl)
725 VEC_safe_push (tree, gc, pending_statics, decl);
727 if (LOCAL_CLASS_P (current_class_type))
728 permerror (input_location, "local class %q#T shall not have static data member %q#D",
729 current_class_type, decl);
731 /* Static consts need not be initialized in the class definition. */
732 if (init != NULL_TREE && TYPE_NEEDS_CONSTRUCTING (TREE_TYPE (decl)))
734 static int explained = 0;
736 error ("initializer invalid for static member with constructor");
739 error ("(an out of class initialization is required)");
744 /* Force the compiler to know when an uninitialized static const
745 member is being used. */
746 if (CP_TYPE_CONST_P (TREE_TYPE (decl)) && init == 0)
747 TREE_USED (decl) = 1;
748 DECL_INITIAL (decl) = init;
749 DECL_IN_AGGR_P (decl) = 1;
751 cp_finish_decl (decl, init, init_const_expr_p, asmspec_tree, flags);
754 /* DECLARATOR and DECLSPECS correspond to a class member. The other
755 parameters are as for cp_finish_decl. Return the DECL for the
756 class member declared. */
759 grokfield (const cp_declarator *declarator,
760 cp_decl_specifier_seq *declspecs,
761 tree init, bool init_const_expr_p,
766 const char *asmspec = 0;
767 int flags = LOOKUP_ONLYCONVERTING;
770 && TREE_CODE (init) == TREE_LIST
771 && TREE_VALUE (init) == error_mark_node
772 && TREE_CHAIN (init) == NULL_TREE)
775 value = grokdeclarator (declarator, declspecs, FIELD, init != 0, &attrlist);
776 if (! value || error_operand_p (value))
777 /* friend or constructor went bad. */
778 return error_mark_node;
780 if (TREE_CODE (value) == TYPE_DECL && init)
782 error ("typedef %qD is initialized (use __typeof__ instead)", value);
786 /* Pass friendly classes back. */
787 if (value == void_type_node)
790 /* Pass friend decls back. */
791 if ((TREE_CODE (value) == FUNCTION_DECL
792 || TREE_CODE (value) == TEMPLATE_DECL)
793 && DECL_CONTEXT (value) != current_class_type)
796 if (DECL_NAME (value) != NULL_TREE
797 && IDENTIFIER_POINTER (DECL_NAME (value))[0] == '_'
798 && ! strcmp (IDENTIFIER_POINTER (DECL_NAME (value)), "_vptr"))
799 error ("member %qD conflicts with virtual function table field name",
802 /* Stash away type declarations. */
803 if (TREE_CODE (value) == TYPE_DECL)
805 DECL_NONLOCAL (value) = 1;
806 DECL_CONTEXT (value) = current_class_type;
808 if (processing_template_decl)
809 value = push_template_decl (value);
815 /* If this is a typedef that names the class for linkage purposes
816 (7.1.3p8), apply any attributes directly to the type. */
817 if (TAGGED_TYPE_P (TREE_TYPE (value))
818 && value == TYPE_NAME (TYPE_MAIN_VARIANT (TREE_TYPE (value))))
819 attrflags = ATTR_FLAG_TYPE_IN_PLACE;
821 cplus_decl_attributes (&value, attrlist, attrflags);
824 if (declspecs->specs[(int)ds_typedef]
825 && TREE_TYPE (value) != error_mark_node
826 && TYPE_NAME (TYPE_MAIN_VARIANT (TREE_TYPE (value))) != value)
827 set_underlying_type (value);
832 if (DECL_IN_AGGR_P (value))
834 error ("%qD is already defined in %qT", value, DECL_CONTEXT (value));
835 return void_type_node;
838 if (asmspec_tree && asmspec_tree != error_mark_node)
839 asmspec = TREE_STRING_POINTER (asmspec_tree);
843 if (TREE_CODE (value) == FUNCTION_DECL)
845 /* Initializers for functions are rejected early in the parser.
846 If we get here, it must be a pure specifier for a method. */
847 if (init == ridpointers[(int)RID_DELETE])
849 DECL_DELETED_FN (value) = 1;
850 DECL_DECLARED_INLINE_P (value) = 1;
851 DECL_INITIAL (value) = error_mark_node;
853 else if (init == ridpointers[(int)RID_DEFAULT])
855 if (!defaultable_fn_p (value))
856 error ("%qD cannot be defaulted", value);
859 DECL_DEFAULTED_FN (value) = 1;
860 DECL_INITIALIZED_IN_CLASS_P (value) = 1;
861 DECL_DECLARED_INLINE_P (value) = 1;
864 else if (TREE_CODE (TREE_TYPE (value)) == METHOD_TYPE)
866 gcc_assert (error_operand_p (init) || integer_zerop (init));
867 DECL_PURE_VIRTUAL_P (value) = 1;
871 gcc_assert (TREE_CODE (TREE_TYPE (value)) == FUNCTION_TYPE);
872 error ("initializer specified for static member function %qD",
876 else if (pedantic && TREE_CODE (value) != VAR_DECL)
877 /* Already complained in grokdeclarator. */
879 else if (!processing_template_decl)
881 if (TREE_CODE (init) == CONSTRUCTOR)
882 init = digest_init (TREE_TYPE (value), init);
884 init = integral_constant_value (init);
886 if (init != error_mark_node && !TREE_CONSTANT (init))
888 /* We can allow references to things that are effectively
889 static, since references are initialized with the
891 if (TREE_CODE (TREE_TYPE (value)) != REFERENCE_TYPE
892 || (TREE_STATIC (init) == 0
893 && (!DECL_P (init) || DECL_EXTERNAL (init) == 0)))
895 error ("field initializer is not constant");
896 init = error_mark_node;
902 if (processing_template_decl
903 && (TREE_CODE (value) == VAR_DECL || TREE_CODE (value) == FUNCTION_DECL))
905 value = push_template_decl (value);
906 if (error_operand_p (value))
907 return error_mark_node;
911 cplus_decl_attributes (&value, attrlist, 0);
913 switch (TREE_CODE (value))
916 finish_static_data_member_decl (value, init, init_const_expr_p,
917 asmspec_tree, flags);
922 error ("%<asm%> specifiers are not permitted on non-static data members");
923 if (DECL_INITIAL (value) == error_mark_node)
924 init = error_mark_node;
925 cp_finish_decl (value, init, /*init_const_expr_p=*/false,
927 DECL_INITIAL (value) = init;
928 DECL_IN_AGGR_P (value) = 1;
933 set_user_assembler_name (value, asmspec);
935 cp_finish_decl (value,
937 /*init_const_expr_p=*/false,
938 asmspec_tree, flags);
940 /* Pass friends back this way. */
941 if (DECL_FRIEND_P (value))
942 return void_type_node;
944 DECL_IN_AGGR_P (value) = 1;
953 /* Like `grokfield', but for bitfields.
954 WIDTH is non-NULL for bit fields only, and is an INTEGER_CST node. */
957 grokbitfield (const cp_declarator *declarator,
958 cp_decl_specifier_seq *declspecs, tree width,
961 tree value = grokdeclarator (declarator, declspecs, BITFIELD, 0, &attrlist);
963 if (value == error_mark_node)
964 return NULL_TREE; /* friends went bad. */
966 /* Pass friendly classes back. */
967 if (TREE_CODE (value) == VOID_TYPE)
968 return void_type_node;
970 if (!INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (TREE_TYPE (value))
971 && (POINTER_TYPE_P (value)
972 || !dependent_type_p (TREE_TYPE (value))))
974 error ("bit-field %qD with non-integral type", value);
975 return error_mark_node;
978 if (TREE_CODE (value) == TYPE_DECL)
980 error ("cannot declare %qD to be a bit-field type", value);
984 /* Usually, finish_struct_1 catches bitfields with invalid types.
985 But, in the case of bitfields with function type, we confuse
986 ourselves into thinking they are member functions, so we must
988 if (TREE_CODE (value) == FUNCTION_DECL)
990 error ("cannot declare bit-field %qD with function type",
995 if (DECL_IN_AGGR_P (value))
997 error ("%qD is already defined in the class %qT", value,
998 DECL_CONTEXT (value));
999 return void_type_node;
1002 if (TREE_STATIC (value))
1004 error ("static member %qD cannot be a bit-field", value);
1007 cp_finish_decl (value, NULL_TREE, false, NULL_TREE, 0);
1009 if (width != error_mark_node)
1011 constant_expression_warning (width);
1012 DECL_INITIAL (value) = width;
1013 SET_DECL_C_BIT_FIELD (value);
1016 DECL_IN_AGGR_P (value) = 1;
1019 cplus_decl_attributes (&value, attrlist, /*flags=*/0);
1025 /* Returns true iff ATTR is an attribute which needs to be applied at
1026 instantiation time rather than template definition time. */
1029 is_late_template_attribute (tree attr, tree decl)
1031 tree name = TREE_PURPOSE (attr);
1032 tree args = TREE_VALUE (attr);
1033 const struct attribute_spec *spec = lookup_attribute_spec (name);
1037 /* Unknown attribute. */
1040 /* Attribute weak handling wants to write out assembly right away. */
1041 if (is_attribute_p ("weak", name))
1044 /* If any of the arguments are dependent expressions, we can't evaluate
1045 the attribute until instantiation time. */
1046 for (arg = args; arg; arg = TREE_CHAIN (arg))
1048 tree t = TREE_VALUE (arg);
1050 /* If the first attribute argument is an identifier, only consider
1051 second and following arguments. Attributes like mode, format,
1052 cleanup and several target specific attributes aren't late
1053 just because they have an IDENTIFIER_NODE as first argument. */
1054 if (arg == args && TREE_CODE (t) == IDENTIFIER_NODE)
1057 if (value_dependent_expression_p (t)
1058 || type_dependent_expression_p (t))
1062 if (TREE_CODE (decl) == TYPE_DECL
1064 || spec->type_required)
1066 tree type = TYPE_P (decl) ? decl : TREE_TYPE (decl);
1068 /* We can't apply any attributes to a completely unknown type until
1069 instantiation time. */
1070 enum tree_code code = TREE_CODE (type);
1071 if (code == TEMPLATE_TYPE_PARM
1072 || code == BOUND_TEMPLATE_TEMPLATE_PARM
1073 || code == TYPENAME_TYPE)
1075 /* Also defer most attributes on dependent types. This is not
1076 necessary in all cases, but is the better default. */
1077 else if (dependent_type_p (type)
1078 /* But attribute visibility specifically works on
1080 && !is_attribute_p ("visibility", name))
1089 /* ATTR_P is a list of attributes. Remove any attributes which need to be
1090 applied at instantiation time and return them. If IS_DEPENDENT is true,
1091 the declaration itself is dependent, so all attributes should be applied
1092 at instantiation time. */
1095 splice_template_attributes (tree *attr_p, tree decl)
1098 tree late_attrs = NULL_TREE;
1099 tree *q = &late_attrs;
1106 if (is_late_template_attribute (*p, decl))
1108 ATTR_IS_DEPENDENT (*p) = 1;
1110 *p = TREE_CHAIN (*p);
1111 q = &TREE_CHAIN (*q);
1115 p = &TREE_CHAIN (*p);
1121 /* Remove any late attributes from the list in ATTR_P and attach them to
1125 save_template_attributes (tree *attr_p, tree *decl_p)
1127 tree late_attrs = splice_template_attributes (attr_p, *decl_p);
1129 tree old_attrs = NULL_TREE;
1134 if (DECL_P (*decl_p))
1135 q = &DECL_ATTRIBUTES (*decl_p);
1137 q = &TYPE_ATTRIBUTES (*decl_p);
1141 /* Place the late attributes at the beginning of the attribute
1143 TREE_CHAIN (tree_last (late_attrs)) = *q;
1146 if (!DECL_P (*decl_p) && *decl_p == TYPE_MAIN_VARIANT (*decl_p))
1148 /* We've added new attributes directly to the main variant, so
1149 now we need to update all of the other variants to include
1150 these new attributes. */
1152 for (variant = TYPE_NEXT_VARIANT (*decl_p); variant;
1153 variant = TYPE_NEXT_VARIANT (variant))
1155 gcc_assert (TYPE_ATTRIBUTES (variant) == old_attrs);
1156 TYPE_ATTRIBUTES (variant) = TYPE_ATTRIBUTES (*decl_p);
1161 /* Like reconstruct_complex_type, but handle also template trees. */
1164 cp_reconstruct_complex_type (tree type, tree bottom)
1168 if (TREE_CODE (type) == POINTER_TYPE)
1170 inner = cp_reconstruct_complex_type (TREE_TYPE (type), bottom);
1171 outer = build_pointer_type_for_mode (inner, TYPE_MODE (type),
1172 TYPE_REF_CAN_ALIAS_ALL (type));
1174 else if (TREE_CODE (type) == REFERENCE_TYPE)
1176 inner = cp_reconstruct_complex_type (TREE_TYPE (type), bottom);
1177 outer = build_reference_type_for_mode (inner, TYPE_MODE (type),
1178 TYPE_REF_CAN_ALIAS_ALL (type));
1180 else if (TREE_CODE (type) == ARRAY_TYPE)
1182 inner = cp_reconstruct_complex_type (TREE_TYPE (type), bottom);
1183 outer = build_cplus_array_type (inner, TYPE_DOMAIN (type));
1184 /* Don't call cp_build_qualified_type on ARRAY_TYPEs, the
1185 element type qualification will be handled by the recursive
1186 cp_reconstruct_complex_type call and cp_build_qualified_type
1187 for ARRAY_TYPEs changes the element type. */
1190 else if (TREE_CODE (type) == FUNCTION_TYPE)
1192 inner = cp_reconstruct_complex_type (TREE_TYPE (type), bottom);
1193 outer = build_function_type (inner, TYPE_ARG_TYPES (type));
1195 else if (TREE_CODE (type) == METHOD_TYPE)
1197 inner = cp_reconstruct_complex_type (TREE_TYPE (type), bottom);
1198 /* The build_method_type_directly() routine prepends 'this' to argument list,
1199 so we must compensate by getting rid of it. */
1201 = build_method_type_directly
1202 (TREE_TYPE (TREE_VALUE (TYPE_ARG_TYPES (type))),
1204 TREE_CHAIN (TYPE_ARG_TYPES (type)));
1206 else if (TREE_CODE (type) == OFFSET_TYPE)
1208 inner = cp_reconstruct_complex_type (TREE_TYPE (type), bottom);
1209 outer = build_offset_type (TYPE_OFFSET_BASETYPE (type), inner);
1214 return cp_build_qualified_type (outer, TYPE_QUALS (type));
1217 /* Like decl_attributes, but handle C++ complexity. */
1220 cplus_decl_attributes (tree *decl, tree attributes, int flags)
1222 if (*decl == NULL_TREE || *decl == void_type_node
1223 || *decl == error_mark_node
1224 || attributes == NULL_TREE)
1227 if (processing_template_decl)
1229 if (check_for_bare_parameter_packs (attributes))
1232 save_template_attributes (&attributes, decl);
1233 if (attributes == NULL_TREE)
1237 if (TREE_CODE (*decl) == TEMPLATE_DECL)
1238 decl = &DECL_TEMPLATE_RESULT (*decl);
1240 decl_attributes (decl, attributes, flags);
1242 if (TREE_CODE (*decl) == TYPE_DECL)
1243 SET_IDENTIFIER_TYPE_VALUE (DECL_NAME (*decl), TREE_TYPE (*decl));
1246 /* Walks through the namespace- or function-scope anonymous union
1247 OBJECT, with the indicated TYPE, building appropriate VAR_DECLs.
1248 Returns one of the fields for use in the mangled name. */
1251 build_anon_union_vars (tree type, tree object)
1253 tree main_decl = NULL_TREE;
1256 /* Rather than write the code to handle the non-union case,
1257 just give an error. */
1258 if (TREE_CODE (type) != UNION_TYPE)
1259 error ("anonymous struct not inside named type");
1261 for (field = TYPE_FIELDS (type);
1263 field = TREE_CHAIN (field))
1268 if (DECL_ARTIFICIAL (field))
1270 if (TREE_CODE (field) != FIELD_DECL)
1272 permerror (input_location, "%q+#D invalid; an anonymous union can only "
1273 "have non-static data members", field);
1277 if (TREE_PRIVATE (field))
1278 permerror (input_location, "private member %q+#D in anonymous union", field);
1279 else if (TREE_PROTECTED (field))
1280 permerror (input_location, "protected member %q+#D in anonymous union", field);
1282 if (processing_template_decl)
1283 ref = build_min_nt (COMPONENT_REF, object,
1284 DECL_NAME (field), NULL_TREE);
1286 ref = build_class_member_access_expr (object, field, NULL_TREE,
1287 false, tf_warning_or_error);
1289 if (DECL_NAME (field))
1293 decl = build_decl (input_location,
1294 VAR_DECL, DECL_NAME (field), TREE_TYPE (field));
1295 DECL_ANON_UNION_VAR_P (decl) = 1;
1297 base = get_base_address (object);
1298 TREE_PUBLIC (decl) = TREE_PUBLIC (base);
1299 TREE_STATIC (decl) = TREE_STATIC (base);
1300 DECL_EXTERNAL (decl) = DECL_EXTERNAL (base);
1302 SET_DECL_VALUE_EXPR (decl, ref);
1303 DECL_HAS_VALUE_EXPR_P (decl) = 1;
1305 decl = pushdecl (decl);
1307 else if (ANON_AGGR_TYPE_P (TREE_TYPE (field)))
1308 decl = build_anon_union_vars (TREE_TYPE (field), ref);
1312 if (main_decl == NULL_TREE)
1319 /* Finish off the processing of a UNION_TYPE structure. If the union is an
1320 anonymous union, then all members must be laid out together. PUBLIC_P
1321 is nonzero if this union is not declared static. */
1324 finish_anon_union (tree anon_union_decl)
1330 if (anon_union_decl == error_mark_node)
1333 type = TREE_TYPE (anon_union_decl);
1334 public_p = TREE_PUBLIC (anon_union_decl);
1336 /* The VAR_DECL's context is the same as the TYPE's context. */
1337 DECL_CONTEXT (anon_union_decl) = DECL_CONTEXT (TYPE_NAME (type));
1339 if (TYPE_FIELDS (type) == NULL_TREE)
1344 error ("namespace-scope anonymous aggregates must be static");
1348 main_decl = build_anon_union_vars (type, anon_union_decl);
1349 if (main_decl == error_mark_node)
1351 if (main_decl == NULL_TREE)
1353 warning (0, "anonymous union with no members");
1357 if (!processing_template_decl)
1359 /* Use main_decl to set the mangled name. */
1360 DECL_NAME (anon_union_decl) = DECL_NAME (main_decl);
1361 maybe_commonize_var (anon_union_decl);
1362 mangle_decl (anon_union_decl);
1363 DECL_NAME (anon_union_decl) = NULL_TREE;
1366 pushdecl (anon_union_decl);
1367 if (building_stmt_tree ()
1368 && at_function_scope_p ())
1369 add_decl_expr (anon_union_decl);
1370 else if (!processing_template_decl)
1371 rest_of_decl_compilation (anon_union_decl,
1372 toplevel_bindings_p (), at_eof);
1375 /* Auxiliary functions to make type signatures for
1376 `operator new' and `operator delete' correspond to
1377 what compiler will be expecting. */
1380 coerce_new_type (tree type)
1383 tree args = TYPE_ARG_TYPES (type);
1385 gcc_assert (TREE_CODE (type) == FUNCTION_TYPE);
1387 if (!same_type_p (TREE_TYPE (type), ptr_type_node))
1390 error ("%<operator new%> must return type %qT", ptr_type_node);
1393 if (args && args != void_list_node)
1395 if (TREE_PURPOSE (args))
1397 /* [basic.stc.dynamic.allocation]
1399 The first parameter shall not have an associated default
1401 error ("the first parameter of %<operator new%> cannot "
1402 "have a default argument");
1403 /* Throw away the default argument. */
1404 TREE_PURPOSE (args) = NULL_TREE;
1407 if (!same_type_p (TREE_VALUE (args), size_type_node))
1410 args = TREE_CHAIN (args);
1417 permerror (input_location, "%<operator new%> takes type %<size_t%> (%qT) "
1418 "as first parameter", size_type_node);
1423 args = tree_cons (NULL_TREE, size_type_node, args);
1426 type = build_exception_variant
1427 (build_function_type (ptr_type_node, args),
1428 TYPE_RAISES_EXCEPTIONS (type));
1436 coerce_delete_type (tree type)
1439 tree args = TYPE_ARG_TYPES (type);
1441 gcc_assert (TREE_CODE (type) == FUNCTION_TYPE);
1443 if (!same_type_p (TREE_TYPE (type), void_type_node))
1446 error ("%<operator delete%> must return type %qT", void_type_node);
1449 if (!args || args == void_list_node
1450 || !same_type_p (TREE_VALUE (args), ptr_type_node))
1453 if (args && args != void_list_node)
1454 args = TREE_CHAIN (args);
1455 error ("%<operator delete%> takes type %qT as first parameter",
1461 args = tree_cons (NULL_TREE, ptr_type_node, args);
1464 type = build_exception_variant
1465 (build_function_type (void_type_node, args),
1466 TYPE_RAISES_EXCEPTIONS (type));
1474 /* DECL is a VAR_DECL for a vtable: walk through the entries in the vtable
1475 and mark them as needed. */
1478 mark_vtable_entries (tree decl)
1481 unsigned HOST_WIDE_INT idx;
1483 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (DECL_INITIAL (decl)),
1488 STRIP_NOPS (fnaddr);
1490 if (TREE_CODE (fnaddr) != ADDR_EXPR
1491 && TREE_CODE (fnaddr) != FDESC_EXPR)
1492 /* This entry is an offset: a virtual base class offset, a
1493 virtual call offset, an RTTI offset, etc. */
1496 fn = TREE_OPERAND (fnaddr, 0);
1497 TREE_ADDRESSABLE (fn) = 1;
1498 /* When we don't have vcall offsets, we output thunks whenever
1499 we output the vtables that contain them. With vcall offsets,
1500 we know all the thunks we'll need when we emit a virtual
1501 function, so we emit the thunks there instead. */
1502 if (DECL_THUNK_P (fn))
1503 use_thunk (fn, /*emit_p=*/0);
1508 /* Set DECL up to have the closest approximation of "initialized common"
1509 linkage available. */
1512 comdat_linkage (tree decl)
1515 make_decl_one_only (decl, cxx_comdat_group (decl));
1516 else if (TREE_CODE (decl) == FUNCTION_DECL
1517 || (TREE_CODE (decl) == VAR_DECL && DECL_ARTIFICIAL (decl)))
1518 /* We can just emit function and compiler-generated variables
1519 statically; having multiple copies is (for the most part) only
1522 There are two correctness issues, however: the address of a
1523 template instantiation with external linkage should be the
1524 same, independent of what translation unit asks for the
1525 address, and this will not hold when we emit multiple copies of
1526 the function. However, there's little else we can do.
1528 Also, by default, the typeinfo implementation assumes that
1529 there will be only one copy of the string used as the name for
1530 each type. Therefore, if weak symbols are unavailable, the
1531 run-time library should perform a more conservative check; it
1532 should perform a string comparison, rather than an address
1534 TREE_PUBLIC (decl) = 0;
1537 /* Static data member template instantiations, however, cannot
1538 have multiple copies. */
1539 if (DECL_INITIAL (decl) == 0
1540 || DECL_INITIAL (decl) == error_mark_node)
1541 DECL_COMMON (decl) = 1;
1542 else if (EMPTY_CONSTRUCTOR_P (DECL_INITIAL (decl)))
1544 DECL_COMMON (decl) = 1;
1545 DECL_INITIAL (decl) = error_mark_node;
1547 else if (!DECL_EXPLICIT_INSTANTIATION (decl))
1549 /* We can't do anything useful; leave vars for explicit
1551 DECL_EXTERNAL (decl) = 1;
1552 DECL_NOT_REALLY_EXTERN (decl) = 0;
1556 if (DECL_LANG_SPECIFIC (decl))
1557 DECL_COMDAT (decl) = 1;
1560 /* For win32 we also want to put explicit instantiations in
1561 linkonce sections, so that they will be merged with implicit
1562 instantiations; otherwise we get duplicate symbol errors.
1563 For Darwin we do not want explicit instantiations to be
1567 maybe_make_one_only (tree decl)
1569 /* We used to say that this was not necessary on targets that support weak
1570 symbols, because the implicit instantiations will defer to the explicit
1571 one. However, that's not actually the case in SVR4; a strong definition
1572 after a weak one is an error. Also, not making explicit
1573 instantiations one_only means that we can end up with two copies of
1574 some template instantiations. */
1578 /* We can't set DECL_COMDAT on functions, or cp_finish_file will think
1579 we can get away with not emitting them if they aren't used. We need
1580 to for variables so that cp_finish_decl will update their linkage,
1581 because their DECL_INITIAL may not have been set properly yet. */
1583 if (!TARGET_WEAK_NOT_IN_ARCHIVE_TOC
1584 || (! DECL_EXPLICIT_INSTANTIATION (decl)
1585 && ! DECL_TEMPLATE_SPECIALIZATION (decl)))
1587 make_decl_one_only (decl, cxx_comdat_group (decl));
1589 if (TREE_CODE (decl) == VAR_DECL)
1591 DECL_COMDAT (decl) = 1;
1592 /* Mark it needed so we don't forget to emit it. */
1593 mark_decl_referenced (decl);
1598 /* Determine whether or not we want to specifically import or export CTYPE,
1599 using various heuristics. */
1602 import_export_class (tree ctype)
1604 /* -1 for imported, 1 for exported. */
1605 int import_export = 0;
1607 /* It only makes sense to call this function at EOF. The reason is
1608 that this function looks at whether or not the first non-inline
1609 non-abstract virtual member function has been defined in this
1610 translation unit. But, we can't possibly know that until we've
1611 seen the entire translation unit. */
1612 gcc_assert (at_eof);
1614 if (CLASSTYPE_INTERFACE_KNOWN (ctype))
1617 /* If MULTIPLE_SYMBOL_SPACES is set and we saw a #pragma interface,
1618 we will have CLASSTYPE_INTERFACE_ONLY set but not
1619 CLASSTYPE_INTERFACE_KNOWN. In that case, we don't want to use this
1620 heuristic because someone will supply a #pragma implementation
1621 elsewhere, and deducing it here would produce a conflict. */
1622 if (CLASSTYPE_INTERFACE_ONLY (ctype))
1625 if (lookup_attribute ("dllimport", TYPE_ATTRIBUTES (ctype)))
1627 else if (lookup_attribute ("dllexport", TYPE_ATTRIBUTES (ctype)))
1629 else if (CLASSTYPE_IMPLICIT_INSTANTIATION (ctype)
1630 && !flag_implicit_templates)
1631 /* For a template class, without -fimplicit-templates, check the
1632 repository. If the virtual table is assigned to this
1633 translation unit, then export the class; otherwise, import
1635 import_export = repo_export_class_p (ctype) ? 1 : -1;
1636 else if (TYPE_POLYMORPHIC_P (ctype))
1638 /* The ABI specifies that the virtual table and associated
1639 information are emitted with the key method, if any. */
1640 tree method = CLASSTYPE_KEY_METHOD (ctype);
1641 /* If weak symbol support is not available, then we must be
1642 careful not to emit the vtable when the key function is
1643 inline. An inline function can be defined in multiple
1644 translation units. If we were to emit the vtable in each
1645 translation unit containing a definition, we would get
1646 multiple definition errors at link-time. */
1647 if (method && (flag_weak || ! DECL_DECLARED_INLINE_P (method)))
1648 import_export = (DECL_REALLY_EXTERN (method) ? -1 : 1);
1651 /* When MULTIPLE_SYMBOL_SPACES is set, we cannot count on seeing
1652 a definition anywhere else. */
1653 if (MULTIPLE_SYMBOL_SPACES && import_export == -1)
1656 /* Allow back ends the chance to overrule the decision. */
1657 if (targetm.cxx.import_export_class)
1658 import_export = targetm.cxx.import_export_class (ctype, import_export);
1662 SET_CLASSTYPE_INTERFACE_KNOWN (ctype);
1663 CLASSTYPE_INTERFACE_ONLY (ctype) = (import_export < 0);
1667 /* Return true if VAR has already been provided to the back end; in that
1668 case VAR should not be modified further by the front end. */
1670 var_finalized_p (tree var)
1672 return varpool_node (var)->finalized;
1675 /* DECL is a VAR_DECL or FUNCTION_DECL which, for whatever reason,
1676 must be emitted in this translation unit. Mark it as such. */
1679 mark_needed (tree decl)
1681 /* It's possible that we no longer need to set
1682 TREE_SYMBOL_REFERENCED here directly, but doing so is
1684 TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)) = 1;
1685 mark_decl_referenced (decl);
1688 /* DECL is either a FUNCTION_DECL or a VAR_DECL. This function
1689 returns true if a definition of this entity should be provided in
1690 this object file. Callers use this function to determine whether
1691 or not to let the back end know that a definition of DECL is
1692 available in this translation unit. */
1695 decl_needed_p (tree decl)
1697 gcc_assert (TREE_CODE (decl) == VAR_DECL
1698 || TREE_CODE (decl) == FUNCTION_DECL);
1699 /* This function should only be called at the end of the translation
1700 unit. We cannot be sure of whether or not something will be
1701 COMDAT until that point. */
1702 gcc_assert (at_eof);
1704 /* All entities with external linkage that are not COMDAT should be
1705 emitted; they may be referred to from other object files. */
1706 if (TREE_PUBLIC (decl) && !DECL_COMDAT (decl))
1708 /* If this entity was used, let the back end see it; it will decide
1709 whether or not to emit it into the object file. */
1710 if (TREE_USED (decl)
1711 || (DECL_ASSEMBLER_NAME_SET_P (decl)
1712 && TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))))
1714 /* Functions marked "dllexport" must be emitted so that they are
1715 visible to other DLLs. */
1716 if (lookup_attribute ("dllexport", DECL_ATTRIBUTES (decl)))
1718 /* Otherwise, DECL does not need to be emitted -- yet. A subsequent
1719 reference to DECL might cause it to be emitted later. */
1723 /* If necessary, write out the vtables for the dynamic class CTYPE.
1724 Returns true if any vtables were emitted. */
1727 maybe_emit_vtables (tree ctype)
1733 /* If the vtables for this class have already been emitted there is
1734 nothing more to do. */
1735 primary_vtbl = CLASSTYPE_VTABLES (ctype);
1736 if (var_finalized_p (primary_vtbl))
1738 /* Ignore dummy vtables made by get_vtable_decl. */
1739 if (TREE_TYPE (primary_vtbl) == void_type_node)
1742 /* On some targets, we cannot determine the key method until the end
1743 of the translation unit -- which is when this function is
1745 if (!targetm.cxx.key_method_may_be_inline ())
1746 determine_key_method (ctype);
1748 /* See if any of the vtables are needed. */
1749 for (vtbl = CLASSTYPE_VTABLES (ctype); vtbl; vtbl = TREE_CHAIN (vtbl))
1751 import_export_decl (vtbl);
1752 if (DECL_NOT_REALLY_EXTERN (vtbl) && decl_needed_p (vtbl))
1757 /* If the references to this class' vtables are optimized away,
1758 still emit the appropriate debugging information. See
1760 if (DECL_COMDAT (primary_vtbl)
1761 && CLASSTYPE_DEBUG_REQUESTED (ctype))
1762 note_debug_info_needed (ctype);
1766 /* The ABI requires that we emit all of the vtables if we emit any
1768 for (vtbl = CLASSTYPE_VTABLES (ctype); vtbl; vtbl = TREE_CHAIN (vtbl))
1770 /* Mark entities references from the virtual table as used. */
1771 mark_vtable_entries (vtbl);
1773 if (TREE_TYPE (DECL_INITIAL (vtbl)) == 0)
1775 tree expr = store_init_value (vtbl, DECL_INITIAL (vtbl), LOOKUP_NORMAL);
1777 /* It had better be all done at compile-time. */
1782 DECL_EXTERNAL (vtbl) = 0;
1783 rest_of_decl_compilation (vtbl, 1, 1);
1785 /* Because we're only doing syntax-checking, we'll never end up
1786 actually marking the variable as written. */
1787 if (flag_syntax_only)
1788 TREE_ASM_WRITTEN (vtbl) = 1;
1791 /* Since we're writing out the vtable here, also write the debug
1793 note_debug_info_needed (ctype);
1798 /* A special return value from type_visibility meaning internal
1801 enum { VISIBILITY_ANON = VISIBILITY_INTERNAL+1 };
1803 /* walk_tree helper function for type_visibility. */
1806 min_vis_r (tree *tp, int *walk_subtrees, void *data)
1808 int *vis_p = (int *)data;
1813 else if (CLASS_TYPE_P (*tp))
1815 if (!TREE_PUBLIC (TYPE_MAIN_DECL (*tp)))
1817 *vis_p = VISIBILITY_ANON;
1820 else if (CLASSTYPE_VISIBILITY (*tp) > *vis_p)
1821 *vis_p = CLASSTYPE_VISIBILITY (*tp);
1826 /* Returns the visibility of TYPE, which is the minimum visibility of its
1830 type_visibility (tree type)
1832 int vis = VISIBILITY_DEFAULT;
1833 cp_walk_tree_without_duplicates (&type, min_vis_r, &vis);
1837 /* Limit the visibility of DECL to VISIBILITY, if not explicitly
1838 specified (or if VISIBILITY is static). */
1841 constrain_visibility (tree decl, int visibility)
1843 if (visibility == VISIBILITY_ANON)
1845 /* extern "C" declarations aren't affected by the anonymous
1847 if (!DECL_EXTERN_C_P (decl))
1849 TREE_PUBLIC (decl) = 0;
1850 DECL_COMDAT_GROUP (decl) = NULL_TREE;
1851 DECL_INTERFACE_KNOWN (decl) = 1;
1852 if (DECL_LANG_SPECIFIC (decl))
1853 DECL_NOT_REALLY_EXTERN (decl) = 1;
1856 else if (visibility > DECL_VISIBILITY (decl)
1857 && !DECL_VISIBILITY_SPECIFIED (decl))
1859 DECL_VISIBILITY (decl) = (enum symbol_visibility) visibility;
1865 /* Constrain the visibility of DECL based on the visibility of its template
1869 constrain_visibility_for_template (tree decl, tree targs)
1871 /* If this is a template instantiation, check the innermost
1872 template args for visibility constraints. The outer template
1873 args are covered by the class check. */
1874 tree args = INNERMOST_TEMPLATE_ARGS (targs);
1876 for (i = TREE_VEC_LENGTH (args); i > 0; --i)
1880 tree arg = TREE_VEC_ELT (args, i-1);
1882 vis = type_visibility (arg);
1883 else if (TREE_TYPE (arg) && POINTER_TYPE_P (TREE_TYPE (arg)))
1886 if (TREE_CODE (arg) == ADDR_EXPR)
1887 arg = TREE_OPERAND (arg, 0);
1888 if (TREE_CODE (arg) == VAR_DECL
1889 || TREE_CODE (arg) == FUNCTION_DECL)
1891 if (! TREE_PUBLIC (arg))
1892 vis = VISIBILITY_ANON;
1894 vis = DECL_VISIBILITY (arg);
1898 constrain_visibility (decl, vis);
1902 /* Like c_determine_visibility, but with additional C++-specific
1905 Function-scope entities can rely on the function's visibility because
1906 it is set in start_preparsed_function.
1908 Class-scope entities cannot rely on the class's visibility until the end
1909 of the enclosing class definition.
1911 Note that because namespaces have multiple independent definitions,
1912 namespace visibility is handled elsewhere using the #pragma visibility
1913 machinery rather than by decorating the namespace declaration.
1915 The goal is for constraints from the type to give a diagnostic, and
1916 other constraints to be applied silently. */
1919 determine_visibility (tree decl)
1921 tree class_type = NULL_TREE;
1923 bool orig_visibility_specified;
1924 enum symbol_visibility orig_visibility;
1926 /* Remember that all decls get VISIBILITY_DEFAULT when built. */
1928 /* Only relevant for names with external linkage. */
1929 if (!TREE_PUBLIC (decl))
1932 /* Cloned constructors and destructors get the same visibility as
1933 the underlying function. That should be set up in
1934 maybe_clone_body. */
1935 gcc_assert (!DECL_CLONED_FUNCTION_P (decl));
1937 orig_visibility_specified = DECL_VISIBILITY_SPECIFIED (decl);
1938 orig_visibility = DECL_VISIBILITY (decl);
1940 if (TREE_CODE (decl) == TYPE_DECL)
1942 if (CLASS_TYPE_P (TREE_TYPE (decl)))
1943 use_template = CLASSTYPE_USE_TEMPLATE (TREE_TYPE (decl));
1944 else if (TYPE_TEMPLATE_INFO (TREE_TYPE (decl)))
1949 else if (DECL_LANG_SPECIFIC (decl))
1950 use_template = DECL_USE_TEMPLATE (decl);
1954 /* If DECL is a member of a class, visibility specifiers on the
1955 class can influence the visibility of the DECL. */
1956 if (DECL_CLASS_SCOPE_P (decl))
1957 class_type = DECL_CONTEXT (decl);
1960 /* Not a class member. */
1962 /* Virtual tables have DECL_CONTEXT set to their associated class,
1963 so they are automatically handled above. */
1964 gcc_assert (TREE_CODE (decl) != VAR_DECL
1965 || !DECL_VTABLE_OR_VTT_P (decl));
1967 if (DECL_FUNCTION_SCOPE_P (decl) && ! DECL_VISIBILITY_SPECIFIED (decl))
1969 /* Local statics and classes get the visibility of their
1970 containing function by default, except that
1971 -fvisibility-inlines-hidden doesn't affect them. */
1972 tree fn = DECL_CONTEXT (decl);
1973 if (DECL_VISIBILITY_SPECIFIED (fn) || ! DECL_CLASS_SCOPE_P (fn))
1975 DECL_VISIBILITY (decl) = DECL_VISIBILITY (fn);
1976 DECL_VISIBILITY_SPECIFIED (decl) =
1977 DECL_VISIBILITY_SPECIFIED (fn);
1980 determine_visibility_from_class (decl, DECL_CONTEXT (fn));
1982 /* Local classes in templates have CLASSTYPE_USE_TEMPLATE set,
1983 but have no TEMPLATE_INFO, so don't try to check it. */
1986 else if (TREE_CODE (decl) == VAR_DECL && DECL_TINFO_P (decl)
1987 && flag_visibility_ms_compat)
1989 /* Under -fvisibility-ms-compat, types are visible by default,
1990 even though their contents aren't. */
1991 tree underlying_type = TREE_TYPE (DECL_NAME (decl));
1992 int underlying_vis = type_visibility (underlying_type);
1993 if (underlying_vis == VISIBILITY_ANON
1994 || CLASSTYPE_VISIBILITY_SPECIFIED (underlying_type))
1995 constrain_visibility (decl, underlying_vis);
1997 DECL_VISIBILITY (decl) = VISIBILITY_DEFAULT;
1999 else if (TREE_CODE (decl) == VAR_DECL && DECL_TINFO_P (decl))
2001 /* tinfo visibility is based on the type it's for. */
2002 constrain_visibility
2003 (decl, type_visibility (TREE_TYPE (DECL_NAME (decl))));
2005 /* Give the target a chance to override the visibility associated
2007 if (TREE_PUBLIC (decl)
2008 && !DECL_REALLY_EXTERN (decl)
2009 && CLASS_TYPE_P (TREE_TYPE (DECL_NAME (decl)))
2010 && !CLASSTYPE_VISIBILITY_SPECIFIED (TREE_TYPE (DECL_NAME (decl))))
2011 targetm.cxx.determine_class_data_visibility (decl);
2013 else if (use_template)
2014 /* Template instantiations and specializations get visibility based
2015 on their template unless they override it with an attribute. */;
2016 else if (! DECL_VISIBILITY_SPECIFIED (decl))
2018 /* Set default visibility to whatever the user supplied with
2019 #pragma GCC visibility or a namespace visibility attribute. */
2020 DECL_VISIBILITY (decl) = default_visibility;
2021 DECL_VISIBILITY_SPECIFIED (decl) = visibility_options.inpragma;
2027 /* If the specialization doesn't specify visibility, use the
2028 visibility from the template. */
2029 tree tinfo = (TREE_CODE (decl) == TYPE_DECL
2030 ? TYPE_TEMPLATE_INFO (TREE_TYPE (decl))
2031 : DECL_TEMPLATE_INFO (decl));
2032 tree args = TI_ARGS (tinfo);
2034 if (args != error_mark_node)
2036 int depth = TMPL_ARGS_DEPTH (args);
2037 tree pattern = DECL_TEMPLATE_RESULT (TI_TEMPLATE (tinfo));
2039 if (!DECL_VISIBILITY_SPECIFIED (decl))
2041 DECL_VISIBILITY (decl) = DECL_VISIBILITY (pattern);
2042 DECL_VISIBILITY_SPECIFIED (decl)
2043 = DECL_VISIBILITY_SPECIFIED (pattern);
2046 /* FIXME should TMPL_ARGS_DEPTH really return 1 for null input? */
2047 if (args && depth > template_class_depth (class_type))
2048 /* Limit visibility based on its template arguments. */
2049 constrain_visibility_for_template (decl, args);
2054 determine_visibility_from_class (decl, class_type);
2056 if (decl_anon_ns_mem_p (decl))
2057 /* Names in an anonymous namespace get internal linkage.
2058 This might change once we implement export. */
2059 constrain_visibility (decl, VISIBILITY_ANON);
2060 else if (TREE_CODE (decl) != TYPE_DECL)
2062 /* Propagate anonymity from type to decl. */
2063 int tvis = type_visibility (TREE_TYPE (decl));
2064 if (tvis == VISIBILITY_ANON
2065 || ! DECL_VISIBILITY_SPECIFIED (decl))
2066 constrain_visibility (decl, tvis);
2069 /* If visibility changed and DECL already has DECL_RTL, ensure
2070 symbol flags are updated. */
2071 if ((DECL_VISIBILITY (decl) != orig_visibility
2072 || DECL_VISIBILITY_SPECIFIED (decl) != orig_visibility_specified)
2073 && ((TREE_CODE (decl) == VAR_DECL && TREE_STATIC (decl))
2074 || TREE_CODE (decl) == FUNCTION_DECL)
2075 && DECL_RTL_SET_P (decl))
2076 make_decl_rtl (decl);
2079 /* By default, static data members and function members receive
2080 the visibility of their containing class. */
2083 determine_visibility_from_class (tree decl, tree class_type)
2085 if (DECL_VISIBILITY_SPECIFIED (decl))
2088 if (visibility_options.inlines_hidden
2089 /* Don't do this for inline templates; specializations might not be
2090 inline, and we don't want them to inherit the hidden
2091 visibility. We'll set it here for all inline instantiations. */
2092 && !processing_template_decl
2093 && TREE_CODE (decl) == FUNCTION_DECL
2094 && DECL_DECLARED_INLINE_P (decl)
2095 && (! DECL_LANG_SPECIFIC (decl)
2096 || ! DECL_EXPLICIT_INSTANTIATION (decl)))
2097 DECL_VISIBILITY (decl) = VISIBILITY_HIDDEN;
2100 /* Default to the class visibility. */
2101 DECL_VISIBILITY (decl) = CLASSTYPE_VISIBILITY (class_type);
2102 DECL_VISIBILITY_SPECIFIED (decl)
2103 = CLASSTYPE_VISIBILITY_SPECIFIED (class_type);
2106 /* Give the target a chance to override the visibility associated
2108 if (TREE_CODE (decl) == VAR_DECL
2109 && (DECL_TINFO_P (decl)
2110 || (DECL_VTABLE_OR_VTT_P (decl)
2111 /* Construction virtual tables are not exported because
2112 they cannot be referred to from other object files;
2113 their name is not standardized by the ABI. */
2114 && !DECL_CONSTRUCTION_VTABLE_P (decl)))
2115 && TREE_PUBLIC (decl)
2116 && !DECL_REALLY_EXTERN (decl)
2117 && !CLASSTYPE_VISIBILITY_SPECIFIED (class_type))
2118 targetm.cxx.determine_class_data_visibility (decl);
2121 /* Constrain the visibility of a class TYPE based on the visibility of its
2122 field types. Warn if any fields require lesser visibility. */
2125 constrain_class_visibility (tree type)
2131 int vis = type_visibility (type);
2133 if (vis == VISIBILITY_ANON
2134 || DECL_IN_SYSTEM_HEADER (TYPE_MAIN_DECL (type)))
2137 /* Don't warn about visibility if the class has explicit visibility. */
2138 if (CLASSTYPE_VISIBILITY_SPECIFIED (type))
2139 vis = VISIBILITY_INTERNAL;
2141 for (t = TYPE_FIELDS (type); t; t = TREE_CHAIN (t))
2142 if (TREE_CODE (t) == FIELD_DECL && TREE_TYPE (t) != error_mark_node)
2144 tree ftype = strip_pointer_or_array_types (TREE_TYPE (t));
2145 int subvis = type_visibility (ftype);
2147 if (subvis == VISIBILITY_ANON)
2149 if (!in_main_input_context ())
2151 %qT has a field %qD whose type uses the anonymous namespace",
2154 else if (MAYBE_CLASS_TYPE_P (ftype)
2155 && vis < VISIBILITY_HIDDEN
2156 && subvis >= VISIBILITY_HIDDEN)
2157 warning (OPT_Wattributes, "\
2158 %qT declared with greater visibility than the type of its field %qD",
2162 binfo = TYPE_BINFO (type);
2163 for (i = 0; BINFO_BASE_ITERATE (binfo, i, t); ++i)
2165 int subvis = type_visibility (TREE_TYPE (t));
2167 if (subvis == VISIBILITY_ANON)
2169 if (!in_main_input_context())
2171 %qT has a base %qT whose type uses the anonymous namespace",
2172 type, TREE_TYPE (t));
2174 else if (vis < VISIBILITY_HIDDEN
2175 && subvis >= VISIBILITY_HIDDEN)
2176 warning (OPT_Wattributes, "\
2177 %qT declared with greater visibility than its base %qT",
2178 type, TREE_TYPE (t));
2182 /* DECL is a FUNCTION_DECL or VAR_DECL. If the object file linkage
2183 for DECL has not already been determined, do so now by setting
2184 DECL_EXTERNAL, DECL_COMDAT and other related flags. Until this
2185 function is called entities with vague linkage whose definitions
2186 are available must have TREE_PUBLIC set.
2188 If this function decides to place DECL in COMDAT, it will set
2189 appropriate flags -- but will not clear DECL_EXTERNAL. It is up to
2190 the caller to decide whether or not to clear DECL_EXTERNAL. Some
2191 callers defer that decision until it is clear that DECL is actually
2195 import_export_decl (tree decl)
2200 tree class_type = NULL_TREE;
2202 if (DECL_INTERFACE_KNOWN (decl))
2205 /* We cannot determine what linkage to give to an entity with vague
2206 linkage until the end of the file. For example, a virtual table
2207 for a class will be defined if and only if the key method is
2208 defined in this translation unit. As a further example, consider
2209 that when compiling a translation unit that uses PCH file with
2210 "-frepo" it would be incorrect to make decisions about what
2211 entities to emit when building the PCH; those decisions must be
2212 delayed until the repository information has been processed. */
2213 gcc_assert (at_eof);
2214 /* Object file linkage for explicit instantiations is handled in
2215 mark_decl_instantiated. For static variables in functions with
2216 vague linkage, maybe_commonize_var is used.
2218 Therefore, the only declarations that should be provided to this
2219 function are those with external linkage that are:
2221 * implicit instantiations of function templates
2225 * implicit instantiations of static data members of class
2232 Furthermore, all entities that reach this point must have a
2233 definition available in this translation unit.
2235 The following assertions check these conditions. */
2236 gcc_assert (TREE_CODE (decl) == FUNCTION_DECL
2237 || TREE_CODE (decl) == VAR_DECL);
2238 /* Any code that creates entities with TREE_PUBLIC cleared should
2239 also set DECL_INTERFACE_KNOWN. */
2240 gcc_assert (TREE_PUBLIC (decl));
2241 if (TREE_CODE (decl) == FUNCTION_DECL)
2242 gcc_assert (DECL_IMPLICIT_INSTANTIATION (decl)
2243 || DECL_FRIEND_PSEUDO_TEMPLATE_INSTANTIATION (decl)
2244 || DECL_DECLARED_INLINE_P (decl));
2246 gcc_assert (DECL_IMPLICIT_INSTANTIATION (decl)
2247 || DECL_VTABLE_OR_VTT_P (decl)
2248 || DECL_TINFO_P (decl));
2249 /* Check that a definition of DECL is available in this translation
2251 gcc_assert (!DECL_REALLY_EXTERN (decl));
2253 /* Assume that DECL will not have COMDAT linkage. */
2255 /* Assume that DECL will not be imported into this translation
2259 /* See if the repository tells us whether or not to emit DECL in
2260 this translation unit. */
2261 emit_p = repo_emit_p (decl);
2264 else if (emit_p == 1)
2266 /* The repository indicates that this entity should be defined
2267 here. Make sure the back end honors that request. */
2268 if (TREE_CODE (decl) == VAR_DECL)
2270 else if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (decl)
2271 || DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P (decl))
2274 FOR_EACH_CLONE (clone, decl)
2275 mark_needed (clone);
2279 /* Output the definition as an ordinary strong definition. */
2280 DECL_EXTERNAL (decl) = 0;
2281 DECL_INTERFACE_KNOWN (decl) = 1;
2286 /* We have already decided what to do with this DECL; there is no
2287 need to check anything further. */
2289 else if (TREE_CODE (decl) == VAR_DECL && DECL_VTABLE_OR_VTT_P (decl))
2291 class_type = DECL_CONTEXT (decl);
2292 import_export_class (class_type);
2293 if (TYPE_FOR_JAVA (class_type))
2295 else if (CLASSTYPE_INTERFACE_KNOWN (class_type)
2296 && CLASSTYPE_INTERFACE_ONLY (class_type))
2298 else if ((!flag_weak || TARGET_WEAK_NOT_IN_ARCHIVE_TOC)
2299 && !CLASSTYPE_USE_TEMPLATE (class_type)
2300 && CLASSTYPE_KEY_METHOD (class_type)
2301 && !DECL_DECLARED_INLINE_P (CLASSTYPE_KEY_METHOD (class_type)))
2302 /* The ABI requires that all virtual tables be emitted with
2303 COMDAT linkage. However, on systems where COMDAT symbols
2304 don't show up in the table of contents for a static
2305 archive, or on systems without weak symbols (where we
2306 approximate COMDAT linkage by using internal linkage), the
2307 linker will report errors about undefined symbols because
2308 it will not see the virtual table definition. Therefore,
2309 in the case that we know that the virtual table will be
2310 emitted in only one translation unit, we make the virtual
2311 table an ordinary definition with external linkage. */
2312 DECL_EXTERNAL (decl) = 0;
2313 else if (CLASSTYPE_INTERFACE_KNOWN (class_type))
2315 /* CLASS_TYPE is being exported from this translation unit,
2316 so DECL should be defined here. */
2317 if (!flag_weak && CLASSTYPE_EXPLICIT_INSTANTIATION (class_type))
2318 /* If a class is declared in a header with the "extern
2319 template" extension, then it will not be instantiated,
2320 even in translation units that would normally require
2321 it. Often such classes are explicitly instantiated in
2322 one translation unit. Therefore, the explicit
2323 instantiation must be made visible to other translation
2325 DECL_EXTERNAL (decl) = 0;
2328 /* The generic C++ ABI says that class data is always
2329 COMDAT, even if there is a key function. Some
2330 variants (e.g., the ARM EABI) says that class data
2331 only has COMDAT linkage if the class data might be
2332 emitted in more than one translation unit. When the
2333 key method can be inline and is inline, we still have
2334 to arrange for comdat even though
2335 class_data_always_comdat is false. */
2336 if (!CLASSTYPE_KEY_METHOD (class_type)
2337 || DECL_DECLARED_INLINE_P (CLASSTYPE_KEY_METHOD (class_type))
2338 || targetm.cxx.class_data_always_comdat ())
2340 /* The ABI requires COMDAT linkage. Normally, we
2341 only emit COMDAT things when they are needed;
2342 make sure that we realize that this entity is
2349 else if (!flag_implicit_templates
2350 && CLASSTYPE_IMPLICIT_INSTANTIATION (class_type))
2355 else if (TREE_CODE (decl) == VAR_DECL && DECL_TINFO_P (decl))
2357 tree type = TREE_TYPE (DECL_NAME (decl));
2358 if (CLASS_TYPE_P (type))
2361 import_export_class (type);
2362 if (CLASSTYPE_INTERFACE_KNOWN (type)
2363 && TYPE_POLYMORPHIC_P (type)
2364 && CLASSTYPE_INTERFACE_ONLY (type)
2365 /* If -fno-rtti was specified, then we cannot be sure
2366 that RTTI information will be emitted with the
2367 virtual table of the class, so we must emit it
2368 wherever it is used. */
2373 if (CLASSTYPE_INTERFACE_KNOWN (type)
2374 && !CLASSTYPE_INTERFACE_ONLY (type))
2376 comdat_p = (targetm.cxx.class_data_always_comdat ()
2377 || (CLASSTYPE_KEY_METHOD (type)
2378 && DECL_DECLARED_INLINE_P (CLASSTYPE_KEY_METHOD (type))));
2383 DECL_EXTERNAL (decl) = 0;
2393 else if (DECL_TEMPLATE_INSTANTIATION (decl)
2394 || DECL_FRIEND_PSEUDO_TEMPLATE_INSTANTIATION (decl))
2396 /* DECL is an implicit instantiation of a function or static
2398 if ((flag_implicit_templates
2399 && !flag_use_repository)
2400 || (flag_implicit_inline_templates
2401 && TREE_CODE (decl) == FUNCTION_DECL
2402 && DECL_DECLARED_INLINE_P (decl)))
2405 /* If we are not implicitly generating templates, then mark
2406 this entity as undefined in this translation unit. */
2409 else if (DECL_FUNCTION_MEMBER_P (decl))
2411 if (!DECL_DECLARED_INLINE_P (decl))
2413 tree ctype = DECL_CONTEXT (decl);
2414 import_export_class (ctype);
2415 if (CLASSTYPE_INTERFACE_KNOWN (ctype))
2417 DECL_NOT_REALLY_EXTERN (decl)
2418 = ! (CLASSTYPE_INTERFACE_ONLY (ctype)
2419 || (DECL_DECLARED_INLINE_P (decl)
2420 && ! flag_implement_inlines
2421 && !DECL_VINDEX (decl)));
2423 if (!DECL_NOT_REALLY_EXTERN (decl))
2424 DECL_EXTERNAL (decl) = 1;
2426 /* Always make artificials weak. */
2427 if (DECL_ARTIFICIAL (decl) && flag_weak)
2430 maybe_make_one_only (decl);
2441 /* If we are importing DECL into this translation unit, mark is
2442 an undefined here. */
2443 DECL_EXTERNAL (decl) = 1;
2444 DECL_NOT_REALLY_EXTERN (decl) = 0;
2448 /* If we decided to put DECL in COMDAT, mark it accordingly at
2450 comdat_linkage (decl);
2453 DECL_INTERFACE_KNOWN (decl) = 1;
2456 /* Return an expression that performs the destruction of DECL, which
2457 must be a VAR_DECL whose type has a non-trivial destructor, or is
2458 an array whose (innermost) elements have a non-trivial destructor. */
2461 build_cleanup (tree decl)
2464 tree type = TREE_TYPE (decl);
2466 /* This function should only be called for declarations that really
2467 require cleanups. */
2468 gcc_assert (!TYPE_HAS_TRIVIAL_DESTRUCTOR (type));
2470 /* Treat all objects with destructors as used; the destructor may do
2471 something substantive. */
2474 if (TREE_CODE (type) == ARRAY_TYPE)
2477 temp = build_address (decl);
2478 temp = build_delete (TREE_TYPE (temp), temp,
2479 sfk_complete_destructor,
2480 LOOKUP_NORMAL|LOOKUP_NONVIRTUAL|LOOKUP_DESTRUCTOR, 0);
2484 /* Returns the initialization guard variable for the variable DECL,
2485 which has static storage duration. */
2488 get_guard (tree decl)
2493 sname = mangle_guard_variable (decl);
2494 guard = IDENTIFIER_GLOBAL_VALUE (sname);
2499 /* We use a type that is big enough to contain a mutex as well
2500 as an integer counter. */
2501 guard_type = targetm.cxx.guard_type ();
2502 guard = build_decl (DECL_SOURCE_LOCATION (decl),
2503 VAR_DECL, sname, guard_type);
2505 /* The guard should have the same linkage as what it guards. */
2506 TREE_PUBLIC (guard) = TREE_PUBLIC (decl);
2507 TREE_STATIC (guard) = TREE_STATIC (decl);
2508 DECL_COMMON (guard) = DECL_COMMON (decl);
2509 DECL_COMDAT_GROUP (guard) = DECL_COMDAT_GROUP (decl);
2510 if (TREE_PUBLIC (decl))
2511 DECL_WEAK (guard) = DECL_WEAK (decl);
2512 DECL_VISIBILITY (guard) = DECL_VISIBILITY (decl);
2513 DECL_VISIBILITY_SPECIFIED (guard) = DECL_VISIBILITY_SPECIFIED (decl);
2515 DECL_ARTIFICIAL (guard) = 1;
2516 DECL_IGNORED_P (guard) = 1;
2517 TREE_USED (guard) = 1;
2518 pushdecl_top_level_and_finish (guard, NULL_TREE);
2523 /* Return those bits of the GUARD variable that should be set when the
2524 guarded entity is actually initialized. */
2527 get_guard_bits (tree guard)
2529 if (!targetm.cxx.guard_mask_bit ())
2531 /* We only set the first byte of the guard, in order to leave room
2532 for a mutex in the high-order bits. */
2533 guard = build1 (ADDR_EXPR,
2534 build_pointer_type (TREE_TYPE (guard)),
2536 guard = build1 (NOP_EXPR,
2537 build_pointer_type (char_type_node),
2539 guard = build1 (INDIRECT_REF, char_type_node, guard);
2545 /* Return an expression which determines whether or not the GUARD
2546 variable has already been initialized. */
2549 get_guard_cond (tree guard)
2553 /* Check to see if the GUARD is zero. */
2554 guard = get_guard_bits (guard);
2556 /* Mask off all but the low bit. */
2557 if (targetm.cxx.guard_mask_bit ())
2559 guard_value = integer_one_node;
2560 if (!same_type_p (TREE_TYPE (guard_value), TREE_TYPE (guard)))
2561 guard_value = convert (TREE_TYPE (guard), guard_value);
2562 guard = cp_build_binary_op (input_location,
2563 BIT_AND_EXPR, guard, guard_value,
2564 tf_warning_or_error);
2567 guard_value = integer_zero_node;
2568 if (!same_type_p (TREE_TYPE (guard_value), TREE_TYPE (guard)))
2569 guard_value = convert (TREE_TYPE (guard), guard_value);
2570 return cp_build_binary_op (input_location,
2571 EQ_EXPR, guard, guard_value,
2572 tf_warning_or_error);
2575 /* Return an expression which sets the GUARD variable, indicating that
2576 the variable being guarded has been initialized. */
2579 set_guard (tree guard)
2583 /* Set the GUARD to one. */
2584 guard = get_guard_bits (guard);
2585 guard_init = integer_one_node;
2586 if (!same_type_p (TREE_TYPE (guard_init), TREE_TYPE (guard)))
2587 guard_init = convert (TREE_TYPE (guard), guard_init);
2588 return cp_build_modify_expr (guard, NOP_EXPR, guard_init,
2589 tf_warning_or_error);
2592 /* Start the process of running a particular set of global constructors
2593 or destructors. Subroutine of do_[cd]tors. */
2596 start_objects (int method_type, int initp)
2602 /* Make ctor or dtor function. METHOD_TYPE may be 'I' or 'D'. */
2604 if (initp != DEFAULT_INIT_PRIORITY)
2614 sprintf (type, "%c%c%.5u", method_type, joiner, initp);
2617 sprintf (type, "%c", method_type);
2619 fndecl = build_lang_decl (FUNCTION_DECL,
2620 get_file_function_name (type),
2621 build_function_type (void_type_node,
2623 start_preparsed_function (fndecl, /*attrs=*/NULL_TREE, SF_PRE_PARSED);
2625 TREE_PUBLIC (current_function_decl) = 0;
2627 /* Mark as artificial because it's not explicitly in the user's
2629 DECL_ARTIFICIAL (current_function_decl) = 1;
2631 /* Mark this declaration as used to avoid spurious warnings. */
2632 TREE_USED (current_function_decl) = 1;
2634 /* Mark this function as a global constructor or destructor. */
2635 if (method_type == 'I')
2636 DECL_GLOBAL_CTOR_P (current_function_decl) = 1;
2638 DECL_GLOBAL_DTOR_P (current_function_decl) = 1;
2640 body = begin_compound_stmt (BCS_FN_BODY);
2645 /* Finish the process of running a particular set of global constructors
2646 or destructors. Subroutine of do_[cd]tors. */
2649 finish_objects (int method_type, int initp, tree body)
2654 finish_compound_stmt (body);
2655 fn = finish_function (0);
2657 if (method_type == 'I')
2659 DECL_STATIC_CONSTRUCTOR (fn) = 1;
2660 decl_init_priority_insert (fn, initp);
2664 DECL_STATIC_DESTRUCTOR (fn) = 1;
2665 decl_fini_priority_insert (fn, initp);
2668 expand_or_defer_fn (fn);
2671 /* The names of the parameters to the function created to handle
2672 initializations and destructions for objects with static storage
2674 #define INITIALIZE_P_IDENTIFIER "__initialize_p"
2675 #define PRIORITY_IDENTIFIER "__priority"
2677 /* The name of the function we create to handle initializations and
2678 destructions for objects with static storage duration. */
2679 #define SSDF_IDENTIFIER "__static_initialization_and_destruction"
2681 /* The declaration for the __INITIALIZE_P argument. */
2682 static GTY(()) tree initialize_p_decl;
2684 /* The declaration for the __PRIORITY argument. */
2685 static GTY(()) tree priority_decl;
2687 /* The declaration for the static storage duration function. */
2688 static GTY(()) tree ssdf_decl;
2690 /* All the static storage duration functions created in this
2691 translation unit. */
2692 static GTY(()) VEC(tree,gc) *ssdf_decls;
2694 /* A map from priority levels to information about that priority
2695 level. There may be many such levels, so efficient lookup is
2697 static splay_tree priority_info_map;
2699 /* Begins the generation of the function that will handle all
2700 initialization and destruction of objects with static storage
2701 duration. The function generated takes two parameters of type
2702 `int': __INITIALIZE_P and __PRIORITY. If __INITIALIZE_P is
2703 nonzero, it performs initializations. Otherwise, it performs
2704 destructions. It only performs those initializations or
2705 destructions with the indicated __PRIORITY. The generated function
2708 It is assumed that this function will only be called once per
2709 translation unit. */
2712 start_static_storage_duration_function (unsigned count)
2717 char id[sizeof (SSDF_IDENTIFIER) + 1 /* '\0' */ + 32];
2719 /* Create the identifier for this function. It will be of the form
2720 SSDF_IDENTIFIER_<number>. */
2721 sprintf (id, "%s_%u", SSDF_IDENTIFIER, count);
2723 /* Create the parameters. */
2724 parm_types = void_list_node;
2725 parm_types = tree_cons (NULL_TREE, integer_type_node, parm_types);
2726 parm_types = tree_cons (NULL_TREE, integer_type_node, parm_types);
2727 type = build_function_type (void_type_node, parm_types);
2729 /* Create the FUNCTION_DECL itself. */
2730 ssdf_decl = build_lang_decl (FUNCTION_DECL,
2731 get_identifier (id),
2733 TREE_PUBLIC (ssdf_decl) = 0;
2734 DECL_ARTIFICIAL (ssdf_decl) = 1;
2736 /* Put this function in the list of functions to be called from the
2737 static constructors and destructors. */
2740 ssdf_decls = VEC_alloc (tree, gc, 32);
2742 /* Take this opportunity to initialize the map from priority
2743 numbers to information about that priority level. */
2744 priority_info_map = splay_tree_new (splay_tree_compare_ints,
2745 /*delete_key_fn=*/0,
2746 /*delete_value_fn=*/
2747 (splay_tree_delete_value_fn) &free);
2749 /* We always need to generate functions for the
2750 DEFAULT_INIT_PRIORITY so enter it now. That way when we walk
2751 priorities later, we'll be sure to find the
2752 DEFAULT_INIT_PRIORITY. */
2753 get_priority_info (DEFAULT_INIT_PRIORITY);
2756 VEC_safe_push (tree, gc, ssdf_decls, ssdf_decl);
2758 /* Create the argument list. */
2759 initialize_p_decl = cp_build_parm_decl
2760 (get_identifier (INITIALIZE_P_IDENTIFIER), integer_type_node);
2761 DECL_CONTEXT (initialize_p_decl) = ssdf_decl;
2762 TREE_USED (initialize_p_decl) = 1;
2763 priority_decl = cp_build_parm_decl
2764 (get_identifier (PRIORITY_IDENTIFIER), integer_type_node);
2765 DECL_CONTEXT (priority_decl) = ssdf_decl;
2766 TREE_USED (priority_decl) = 1;
2768 TREE_CHAIN (initialize_p_decl) = priority_decl;
2769 DECL_ARGUMENTS (ssdf_decl) = initialize_p_decl;
2771 /* Put the function in the global scope. */
2772 pushdecl (ssdf_decl);
2774 /* Start the function itself. This is equivalent to declaring the
2777 static void __ssdf (int __initialize_p, init __priority_p);
2779 It is static because we only need to call this function from the
2780 various constructor and destructor functions for this module. */
2781 start_preparsed_function (ssdf_decl,
2782 /*attrs=*/NULL_TREE,
2785 /* Set up the scope of the outermost block in the function. */
2786 body = begin_compound_stmt (BCS_FN_BODY);
2791 /* Finish the generation of the function which performs initialization
2792 and destruction of objects with static storage duration. After
2793 this point, no more such objects can be created. */
2796 finish_static_storage_duration_function (tree body)
2798 /* Close out the function. */
2799 finish_compound_stmt (body);
2800 expand_or_defer_fn (finish_function (0));
2803 /* Return the information about the indicated PRIORITY level. If no
2804 code to handle this level has yet been generated, generate the
2805 appropriate prologue. */
2807 static priority_info
2808 get_priority_info (int priority)
2813 n = splay_tree_lookup (priority_info_map,
2814 (splay_tree_key) priority);
2817 /* Create a new priority information structure, and insert it
2819 pi = XNEW (struct priority_info_s);
2820 pi->initializations_p = 0;
2821 pi->destructions_p = 0;
2822 splay_tree_insert (priority_info_map,
2823 (splay_tree_key) priority,
2824 (splay_tree_value) pi);
2827 pi = (priority_info) n->value;
2832 /* The effective initialization priority of a DECL. */
2834 #define DECL_EFFECTIVE_INIT_PRIORITY(decl) \
2835 ((!DECL_HAS_INIT_PRIORITY_P (decl) || DECL_INIT_PRIORITY (decl) == 0) \
2836 ? DEFAULT_INIT_PRIORITY : DECL_INIT_PRIORITY (decl))
2838 /* Whether a DECL needs a guard to protect it against multiple
2841 #define NEEDS_GUARD_P(decl) (TREE_PUBLIC (decl) && (DECL_COMMON (decl) \
2842 || DECL_ONE_ONLY (decl) \
2843 || DECL_WEAK (decl)))
2845 /* Called from one_static_initialization_or_destruction(),
2847 Walks the initializer list of a global variable and looks for
2848 temporary variables (DECL_NAME() == NULL and DECL_ARTIFICIAL != 0)
2849 and that have their DECL_CONTEXT() == NULL.
2850 For each such temporary variable, set their DECL_CONTEXT() to
2851 the current function. This is necessary because otherwise
2852 some optimizers (enabled by -O2 -fprofile-arcs) might crash
2853 when trying to refer to a temporary variable that does not have
2854 it's DECL_CONTECT() properly set. */
2856 fix_temporary_vars_context_r (tree *node,
2857 int *unused ATTRIBUTE_UNUSED,
2858 void *unused1 ATTRIBUTE_UNUSED)
2860 gcc_assert (current_function_decl);
2862 if (TREE_CODE (*node) == BIND_EXPR)
2866 for (var = BIND_EXPR_VARS (*node); var; var = TREE_CHAIN (var))
2867 if (TREE_CODE (var) == VAR_DECL
2869 && DECL_ARTIFICIAL (var)
2870 && !DECL_CONTEXT (var))
2871 DECL_CONTEXT (var) = current_function_decl;
2877 /* Set up to handle the initialization or destruction of DECL. If
2878 INITP is nonzero, we are initializing the variable. Otherwise, we
2879 are destroying it. */
2882 one_static_initialization_or_destruction (tree decl, tree init, bool initp)
2884 tree guard_if_stmt = NULL_TREE;
2887 /* If we are supposed to destruct and there's a trivial destructor,
2888 nothing has to be done. */
2890 && TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
2893 /* Trick the compiler into thinking we are at the file and line
2894 where DECL was declared so that error-messages make sense, and so
2895 that the debugger will show somewhat sensible file and line
2897 input_location = DECL_SOURCE_LOCATION (decl);
2899 /* Make sure temporary variables in the initialiser all have
2900 their DECL_CONTEXT() set to a value different from NULL_TREE.
2901 This can happen when global variables initialisers are built.
2902 In that case, the DECL_CONTEXT() of the global variables _AND_ of all
2903 the temporary variables that might have been generated in the
2904 accompagning initialisers is NULL_TREE, meaning the variables have been
2905 declared in the global namespace.
2906 What we want to do here is to fix that and make sure the DECL_CONTEXT()
2907 of the temporaries are set to the current function decl. */
2908 cp_walk_tree_without_duplicates (&init,
2909 fix_temporary_vars_context_r,
2916 Access control for implicit calls to the constructors,
2917 the conversion functions, or the destructor called to
2918 create and destroy a static data member is performed as
2919 if these calls appeared in the scope of the member's
2922 we pretend we are in a static member function of the class of
2923 which the DECL is a member. */
2924 if (member_p (decl))
2926 DECL_CONTEXT (current_function_decl) = DECL_CONTEXT (decl);
2927 DECL_STATIC_FUNCTION_P (current_function_decl) = 1;
2930 /* Assume we don't need a guard. */
2932 /* We need a guard if this is an object with external linkage that
2933 might be initialized in more than one place. (For example, a
2934 static data member of a template, when the data member requires
2936 if (NEEDS_GUARD_P (decl))
2940 guard = get_guard (decl);
2942 /* When using __cxa_atexit, we just check the GUARD as we would
2943 for a local static. */
2944 if (flag_use_cxa_atexit)
2946 /* When using __cxa_atexit, we never try to destroy
2947 anything from a static destructor. */
2949 guard_cond = get_guard_cond (guard);
2951 /* If we don't have __cxa_atexit, then we will be running
2952 destructors from .fini sections, or their equivalents. So,
2953 we need to know how many times we've tried to initialize this
2954 object. We do initializations only if the GUARD is zero,
2955 i.e., if we are the first to initialize the variable. We do
2956 destructions only if the GUARD is one, i.e., if we are the
2957 last to destroy the variable. */
2960 = cp_build_binary_op (input_location,
2962 cp_build_unary_op (PREINCREMENT_EXPR,
2965 tf_warning_or_error),
2967 tf_warning_or_error);
2970 = cp_build_binary_op (input_location,
2972 cp_build_unary_op (PREDECREMENT_EXPR,
2975 tf_warning_or_error),
2977 tf_warning_or_error);
2979 guard_if_stmt = begin_if_stmt ();
2980 finish_if_stmt_cond (guard_cond, guard_if_stmt);
2984 /* If we're using __cxa_atexit, we have not already set the GUARD,
2985 so we must do so now. */
2986 if (guard && initp && flag_use_cxa_atexit)
2987 finish_expr_stmt (set_guard (guard));
2989 /* Perform the initialization or destruction. */
2993 finish_expr_stmt (init);
2995 /* If we're using __cxa_atexit, register a function that calls the
2996 destructor for the object. */
2997 if (flag_use_cxa_atexit)
2998 finish_expr_stmt (register_dtor_fn (decl));
3001 finish_expr_stmt (build_cleanup (decl));
3003 /* Finish the guard if-stmt, if necessary. */
3006 finish_then_clause (guard_if_stmt);
3007 finish_if_stmt (guard_if_stmt);
3010 /* Now that we're done with DECL we don't need to pretend to be a
3011 member of its class any longer. */
3012 DECL_CONTEXT (current_function_decl) = NULL_TREE;
3013 DECL_STATIC_FUNCTION_P (current_function_decl) = 0;
3016 /* Generate code to do the initialization or destruction of the decls in VARS,
3017 a TREE_LIST of VAR_DECL with static storage duration.
3018 Whether initialization or destruction is performed is specified by INITP. */
3021 do_static_initialization_or_destruction (tree vars, bool initp)
3023 tree node, init_if_stmt, cond;
3025 /* Build the outer if-stmt to check for initialization or destruction. */
3026 init_if_stmt = begin_if_stmt ();
3027 cond = initp ? integer_one_node : integer_zero_node;
3028 cond = cp_build_binary_op (input_location,
3032 tf_warning_or_error);
3033 finish_if_stmt_cond (cond, init_if_stmt);
3037 tree decl = TREE_VALUE (node);
3038 tree priority_if_stmt;
3042 /* If we don't need a destructor, there's nothing to do. Avoid
3043 creating a possibly empty if-stmt. */
3044 if (!initp && TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
3046 node = TREE_CHAIN (node);
3050 /* Remember that we had an initialization or finalization at this
3052 priority = DECL_EFFECTIVE_INIT_PRIORITY (decl);
3053 pi = get_priority_info (priority);
3055 pi->initializations_p = 1;
3057 pi->destructions_p = 1;
3059 /* Conditionalize this initialization on being in the right priority
3060 and being initializing/finalizing appropriately. */
3061 priority_if_stmt = begin_if_stmt ();
3062 cond = cp_build_binary_op (input_location,
3065 build_int_cst (NULL_TREE, priority),
3066 tf_warning_or_error);
3067 finish_if_stmt_cond (cond, priority_if_stmt);
3069 /* Process initializers with same priority. */
3071 && DECL_EFFECTIVE_INIT_PRIORITY (TREE_VALUE (node)) == priority;
3072 node = TREE_CHAIN (node))
3073 /* Do one initialization or destruction. */
3074 one_static_initialization_or_destruction (TREE_VALUE (node),
3075 TREE_PURPOSE (node), initp);
3077 /* Finish up the priority if-stmt body. */
3078 finish_then_clause (priority_if_stmt);
3079 finish_if_stmt (priority_if_stmt);
3083 /* Finish up the init/destruct if-stmt body. */
3084 finish_then_clause (init_if_stmt);
3085 finish_if_stmt (init_if_stmt);
3088 /* VARS is a list of variables with static storage duration which may
3089 need initialization and/or finalization. Remove those variables
3090 that don't really need to be initialized or finalized, and return
3091 the resulting list. The order in which the variables appear in
3092 VARS is in reverse order of the order in which they should actually
3093 be initialized. The list we return is in the unreversed order;
3094 i.e., the first variable should be initialized first. */
3097 prune_vars_needing_no_initialization (tree *vars)
3100 tree result = NULL_TREE;
3105 tree decl = TREE_VALUE (t);
3106 tree init = TREE_PURPOSE (t);
3108 /* Deal gracefully with error. */
3109 if (decl == error_mark_node)
3111 var = &TREE_CHAIN (t);
3115 /* The only things that can be initialized are variables. */
3116 gcc_assert (TREE_CODE (decl) == VAR_DECL);
3118 /* If this object is not defined, we don't need to do anything
3120 if (DECL_EXTERNAL (decl))
3122 var = &TREE_CHAIN (t);
3126 /* Also, if the initializer already contains errors, we can bail
3128 if (init && TREE_CODE (init) == TREE_LIST
3129 && value_member (error_mark_node, init))
3131 var = &TREE_CHAIN (t);
3135 /* This variable is going to need initialization and/or
3136 finalization, so we add it to the list. */
3137 *var = TREE_CHAIN (t);
3138 TREE_CHAIN (t) = result;
3145 /* Make sure we have told the back end about all the variables in
3149 write_out_vars (tree vars)
3153 for (v = vars; v; v = TREE_CHAIN (v))
3155 tree var = TREE_VALUE (v);
3156 if (!var_finalized_p (var))
3158 import_export_decl (var);
3159 rest_of_decl_compilation (var, 1, 1);
3164 /* Generate a static constructor (if CONSTRUCTOR_P) or destructor
3165 (otherwise) that will initialize all global objects with static
3166 storage duration having the indicated PRIORITY. */
3169 generate_ctor_or_dtor_function (bool constructor_p, int priority,
3178 input_location = *locus;
3180 /* Was: locus->line++; */
3182 /* We use `I' to indicate initialization and `D' to indicate
3184 function_key = constructor_p ? 'I' : 'D';
3186 /* We emit the function lazily, to avoid generating empty
3187 global constructors and destructors. */
3190 /* For Objective-C++, we may need to initialize metadata found in this module.
3191 This must be done _before_ any other static initializations. */
3192 if (c_dialect_objc () && (priority == DEFAULT_INIT_PRIORITY)
3193 && constructor_p && objc_static_init_needed_p ())
3195 body = start_objects (function_key, priority);
3196 objc_generate_static_init_call (NULL_TREE);
3199 /* Call the static storage duration function with appropriate
3201 for (i = 0; VEC_iterate (tree, ssdf_decls, i, fndecl); ++i)
3203 /* Calls to pure or const functions will expand to nothing. */
3204 if (! (flags_from_decl_or_type (fndecl) & (ECF_CONST | ECF_PURE)))
3207 body = start_objects (function_key, priority);
3209 arguments = tree_cons (NULL_TREE,
3210 build_int_cst (NULL_TREE, priority),
3212 arguments = tree_cons (NULL_TREE,
3213 build_int_cst (NULL_TREE, constructor_p),
3215 finish_expr_stmt (cp_build_function_call (fndecl, arguments,
3216 tf_warning_or_error));
3220 /* Close out the function. */
3222 finish_objects (function_key, priority, body);
3225 /* Generate constructor and destructor functions for the priority
3229 generate_ctor_and_dtor_functions_for_priority (splay_tree_node n, void * data)
3231 location_t *locus = (location_t *) data;
3232 int priority = (int) n->key;
3233 priority_info pi = (priority_info) n->value;
3235 /* Generate the functions themselves, but only if they are really
3237 if (pi->initializations_p)
3238 generate_ctor_or_dtor_function (/*constructor_p=*/true, priority, locus);
3239 if (pi->destructions_p)
3240 generate_ctor_or_dtor_function (/*constructor_p=*/false, priority, locus);
3242 /* Keep iterating. */
3246 /* Called via LANGHOOK_CALLGRAPH_ANALYZE_EXPR. It is supposed to mark
3247 decls referenced from front-end specific constructs; it will be called
3248 only for language-specific tree nodes.
3250 Here we must deal with member pointers. */
3253 cxx_callgraph_analyze_expr (tree *tp, int *walk_subtrees ATTRIBUTE_UNUSED)
3257 switch (TREE_CODE (t))
3260 if (TYPE_PTRMEMFUNC_P (TREE_TYPE (t)))
3261 cgraph_mark_address_taken_node (cgraph_node (PTRMEM_CST_MEMBER (t)));
3264 if (TREE_CODE (BASELINK_FUNCTIONS (t)) == FUNCTION_DECL)
3265 cgraph_mark_address_taken_node (cgraph_node (BASELINK_FUNCTIONS (t)));
3268 if (DECL_VTABLE_OR_VTT_P (t))
3270 /* The ABI requires that all virtual tables be emitted
3271 whenever one of them is. */
3273 for (vtbl = CLASSTYPE_VTABLES (DECL_CONTEXT (t));
3275 vtbl = TREE_CHAIN (vtbl))
3276 mark_decl_referenced (vtbl);
3278 else if (DECL_CONTEXT (t)
3279 && TREE_CODE (DECL_CONTEXT (t)) == FUNCTION_DECL)
3280 /* If we need a static variable in a function, then we
3281 need the containing function. */
3282 mark_decl_referenced (DECL_CONTEXT (t));
3291 /* Java requires that we be able to reference a local address for a
3292 method, and not be confused by PLT entries. If hidden aliases are
3293 supported, emit one for each java function that we've emitted. */
3296 build_java_method_aliases (void)
3298 struct cgraph_node *node;
3300 #ifndef HAVE_GAS_HIDDEN
3304 for (node = cgraph_nodes; node ; node = node->next)
3306 tree fndecl = node->decl;
3308 if (TREE_ASM_WRITTEN (fndecl)
3309 && DECL_CONTEXT (fndecl)
3310 && TYPE_P (DECL_CONTEXT (fndecl))
3311 && TYPE_FOR_JAVA (DECL_CONTEXT (fndecl))
3312 && TARGET_USE_LOCAL_THUNK_ALIAS_P (fndecl))
3314 /* Mangle the name in a predictable way; we need to reference
3315 this from a java compiled object file. */
3316 tree oid, nid, alias;
3320 oid = DECL_ASSEMBLER_NAME (fndecl);
3321 oname = IDENTIFIER_POINTER (oid);
3322 gcc_assert (oname[0] == '_' && oname[1] == 'Z');
3323 nname = ACONCAT (("_ZGA", oname+2, NULL));
3324 nid = get_identifier (nname);
3326 alias = make_alias_for (fndecl, nid);
3327 TREE_PUBLIC (alias) = 1;
3328 DECL_VISIBILITY (alias) = VISIBILITY_HIDDEN;
3330 assemble_alias (alias, oid);
3335 /* This routine is called at the end of compilation.
3336 Its job is to create all the code needed to initialize and
3337 destroy the global aggregates. We do the destruction
3338 first, since that way we only need to reverse the decls once. */
3341 cp_write_global_declarations (void)
3347 unsigned ssdf_count = 0;
3351 locus = input_location;
3354 /* Bad parse errors. Just forget about it. */
3355 if (! global_bindings_p () || current_class_type || decl_namespace_list)
3359 c_common_write_pch ();
3361 /* FIXME - huh? was input_line -= 1;*/
3363 /* We now have to write out all the stuff we put off writing out.
3366 o Template specializations that we have not yet instantiated,
3367 but which are needed.
3368 o Initialization and destruction for non-local objects with
3369 static storage duration. (Local objects with static storage
3370 duration are initialized when their scope is first entered,
3371 and are cleaned up via atexit.)
3372 o Virtual function tables.
3374 All of these may cause others to be needed. For example,
3375 instantiating one function may cause another to be needed, and
3376 generating the initializer for an object may cause templates to be
3377 instantiated, etc., etc. */
3379 timevar_push (TV_VARCONST);
3381 emit_support_tinfos ();
3390 /* If there are templates that we've put off instantiating, do
3392 instantiate_pending_templates (retries);
3395 /* Write out virtual tables as required. Note that writing out
3396 the virtual table for a template class may cause the
3397 instantiation of members of that class. If we write out
3398 vtables then we remove the class from our list so we don't
3399 have to look at it again. */
3401 while (keyed_classes != NULL_TREE
3402 && maybe_emit_vtables (TREE_VALUE (keyed_classes)))
3405 keyed_classes = TREE_CHAIN (keyed_classes);
3411 tree next = TREE_CHAIN (t);
3415 if (maybe_emit_vtables (TREE_VALUE (next)))
3418 TREE_CHAIN (t) = TREE_CHAIN (next);
3423 next = TREE_CHAIN (t);
3427 /* Write out needed type info variables. We have to be careful
3428 looping through unemitted decls, because emit_tinfo_decl may
3429 cause other variables to be needed. New elements will be
3430 appended, and we remove from the vector those that actually
3432 for (i = VEC_length (tree, unemitted_tinfo_decls);
3433 VEC_iterate (tree, unemitted_tinfo_decls, --i, t);)
3434 if (emit_tinfo_decl (t))
3437 VEC_unordered_remove (tree, unemitted_tinfo_decls, i);
3440 /* The list of objects with static storage duration is built up
3441 in reverse order. We clear STATIC_AGGREGATES so that any new
3442 aggregates added during the initialization of these will be
3443 initialized in the correct order when we next come around the
3445 vars = prune_vars_needing_no_initialization (&static_aggregates);
3449 /* We need to start a new initialization function each time
3450 through the loop. That's because we need to know which
3451 vtables have been referenced, and TREE_SYMBOL_REFERENCED
3452 isn't computed until a function is finished, and written
3453 out. That's a deficiency in the back end. When this is
3454 fixed, these initialization functions could all become
3455 inline, with resulting performance improvements. */
3458 /* Set the line and file, so that it is obviously not from
3460 input_location = locus;
3461 ssdf_body = start_static_storage_duration_function (ssdf_count);
3463 /* Make sure the back end knows about all the variables. */
3464 write_out_vars (vars);
3466 /* First generate code to do all the initializations. */
3468 do_static_initialization_or_destruction (vars, /*initp=*/true);
3470 /* Then, generate code to do all the destructions. Do these
3471 in reverse order so that the most recently constructed
3472 variable is the first destroyed. If we're using
3473 __cxa_atexit, then we don't need to do this; functions
3474 were registered at initialization time to destroy the
3476 if (!flag_use_cxa_atexit && vars)
3478 vars = nreverse (vars);
3479 do_static_initialization_or_destruction (vars, /*initp=*/false);
3484 /* Finish up the static storage duration function for this
3486 input_location = locus;
3487 finish_static_storage_duration_function (ssdf_body);
3489 /* All those initializations and finalizations might cause
3490 us to need more inline functions, more template
3491 instantiations, etc. */
3494 /* ??? was: locus.line++; */
3497 /* Go through the set of inline functions whose bodies have not
3498 been emitted yet. If out-of-line copies of these functions
3499 are required, emit them. */
3500 for (i = 0; VEC_iterate (tree, deferred_fns, i, decl); ++i)
3502 /* Does it need synthesizing? */
3503 if (DECL_DEFAULTED_FN (decl) && ! DECL_INITIAL (decl)
3504 && (! DECL_REALLY_EXTERN (decl) || possibly_inlined_p (decl)))
3506 /* Even though we're already at the top-level, we push
3507 there again. That way, when we pop back a few lines
3508 hence, all of our state is restored. Otherwise,
3509 finish_function doesn't clean things up, and we end
3510 up with CURRENT_FUNCTION_DECL set. */
3511 push_to_top_level ();
3512 /* The decl's location will mark where it was first
3513 needed. Save that so synthesize method can indicate
3514 where it was needed from, in case of error */
3515 input_location = DECL_SOURCE_LOCATION (decl);
3516 synthesize_method (decl);
3517 pop_from_top_level ();
3521 if (!DECL_SAVED_TREE (decl))
3524 /* We lie to the back end, pretending that some functions
3525 are not defined when they really are. This keeps these
3526 functions from being put out unnecessarily. But, we must
3527 stop lying when the functions are referenced, or if they
3528 are not comdat since they need to be put out now. If
3529 DECL_INTERFACE_KNOWN, then we have already set
3530 DECL_EXTERNAL appropriately, so there's no need to check
3531 again, and we do not want to clear DECL_EXTERNAL if a
3532 previous call to import_export_decl set it.
3534 This is done in a separate for cycle, because if some
3535 deferred function is contained in another deferred
3536 function later in deferred_fns varray,
3537 rest_of_compilation would skip this function and we
3538 really cannot expand the same function twice. */
3539 import_export_decl (decl);
3540 if (DECL_NOT_REALLY_EXTERN (decl)
3541 && DECL_INITIAL (decl)
3542 && decl_needed_p (decl))
3543 DECL_EXTERNAL (decl) = 0;
3545 /* If we're going to need to write this function out, and
3546 there's already a body for it, create RTL for it now.
3547 (There might be no body if this is a method we haven't
3548 gotten around to synthesizing yet.) */
3549 if (!DECL_EXTERNAL (decl)
3550 && decl_needed_p (decl)
3551 && !TREE_ASM_WRITTEN (decl)
3552 && !cgraph_node (decl)->local.finalized)
3554 /* We will output the function; no longer consider it in this
3556 DECL_DEFER_OUTPUT (decl) = 0;
3557 /* Generate RTL for this function now that we know we
3559 expand_or_defer_fn (decl);
3560 /* If we're compiling -fsyntax-only pretend that this
3561 function has been written out so that we don't try to
3563 if (flag_syntax_only)
3564 TREE_ASM_WRITTEN (decl) = 1;
3569 if (walk_namespaces (wrapup_globals_for_namespace, /*data=*/0))
3572 /* Static data members are just like namespace-scope globals. */
3573 for (i = 0; VEC_iterate (tree, pending_statics, i, decl); ++i)
3575 if (var_finalized_p (decl) || DECL_REALLY_EXTERN (decl)
3576 /* Don't write it out if we haven't seen a definition. */
3577 || DECL_IN_AGGR_P (decl))
3579 import_export_decl (decl);
3580 /* If this static data member is needed, provide it to the
3582 if (DECL_NOT_REALLY_EXTERN (decl) && decl_needed_p (decl))
3583 DECL_EXTERNAL (decl) = 0;
3585 if (VEC_length (tree, pending_statics) != 0
3586 && wrapup_global_declarations (VEC_address (tree, pending_statics),
3587 VEC_length (tree, pending_statics)))
3594 /* All used inline functions must have a definition at this point. */
3595 for (i = 0; VEC_iterate (tree, deferred_fns, i, decl); ++i)
3597 if (/* Check online inline functions that were actually used. */
3598 TREE_USED (decl) && DECL_DECLARED_INLINE_P (decl)
3599 /* If the definition actually was available here, then the
3600 fact that the function was not defined merely represents
3601 that for some reason (use of a template repository,
3602 #pragma interface, etc.) we decided not to emit the
3604 && !DECL_INITIAL (decl)
3605 /* An explicit instantiation can be used to specify
3606 that the body is in another unit. It will have
3607 already verified there was a definition. */
3608 && !DECL_EXPLICIT_INSTANTIATION (decl))
3610 warning (0, "inline function %q+D used but never defined", decl);
3611 /* Avoid a duplicate warning from check_global_declaration_1. */
3612 TREE_NO_WARNING (decl) = 1;
3616 /* We give C linkage to static constructors and destructors. */
3617 push_lang_context (lang_name_c);
3619 /* Generate initialization and destruction functions for all
3620 priorities for which they are required. */
3621 if (priority_info_map)
3622 splay_tree_foreach (priority_info_map,
3623 generate_ctor_and_dtor_functions_for_priority,
3625 else if (c_dialect_objc () && objc_static_init_needed_p ())
3626 /* If this is obj-c++ and we need a static init, call
3627 generate_ctor_or_dtor_function. */
3628 generate_ctor_or_dtor_function (/*constructor_p=*/true,
3629 DEFAULT_INIT_PRIORITY, &locus);
3631 /* We're done with the splay-tree now. */
3632 if (priority_info_map)
3633 splay_tree_delete (priority_info_map);
3635 /* Generate any missing aliases. */
3636 maybe_apply_pending_pragma_weaks ();
3638 /* We're done with static constructors, so we can go back to "C++"
3640 pop_lang_context ();
3642 cgraph_finalize_compilation_unit ();
3644 /* Now, issue warnings about static, but not defined, functions,
3645 etc., and emit debugging information. */
3646 walk_namespaces (wrapup_globals_for_namespace, /*data=*/&reconsider);
3647 if (VEC_length (tree, pending_statics) != 0)
3649 check_global_declarations (VEC_address (tree, pending_statics),
3650 VEC_length (tree, pending_statics));
3651 emit_debug_global_declarations (VEC_address (tree, pending_statics),
3652 VEC_length (tree, pending_statics));
3655 /* Generate hidden aliases for Java. */
3656 build_java_method_aliases ();
3660 /* The entire file is now complete. If requested, dump everything
3664 FILE *stream = dump_begin (TDI_tu, &flags);
3668 dump_node (global_namespace, flags & ~TDF_SLIM, stream);
3669 dump_end (TDI_tu, stream);
3673 timevar_pop (TV_VARCONST);
3675 if (flag_detailed_statistics)
3677 dump_tree_statistics ();
3678 dump_time_statistics ();
3680 input_location = locus;
3682 #ifdef ENABLE_CHECKING
3683 validate_conversion_obstack ();
3684 #endif /* ENABLE_CHECKING */
3687 /* FN is an OFFSET_REF, DOTSTAR_EXPR or MEMBER_REF indicating the
3688 function to call in parse-tree form; it has not yet been
3689 semantically analyzed. ARGS are the arguments to the function.
3690 They have already been semantically analyzed. This may change
3694 build_offset_ref_call_from_tree (tree fn, VEC(tree,gc) **args)
3697 VEC(tree,gc) *orig_args = NULL;
3702 object = TREE_OPERAND (fn, 0);
3704 if (processing_template_decl)
3706 gcc_assert (TREE_CODE (fn) == DOTSTAR_EXPR
3707 || TREE_CODE (fn) == MEMBER_REF);
3708 if (type_dependent_expression_p (fn)
3709 || any_type_dependent_arguments_p (*args))
3710 return build_nt_call_vec (fn, *args);
3712 orig_args = make_tree_vector_copy (*args);
3714 /* Transform the arguments and add the implicit "this"
3715 parameter. That must be done before the FN is transformed
3716 because we depend on the form of FN. */
3717 make_args_non_dependent (*args);
3718 object = build_non_dependent_expr (object);
3719 if (TREE_CODE (fn) == DOTSTAR_EXPR)
3720 object = cp_build_unary_op (ADDR_EXPR, object, 0, tf_warning_or_error);
3721 VEC_safe_insert (tree, gc, *args, 0, object);
3722 /* Now that the arguments are done, transform FN. */
3723 fn = build_non_dependent_expr (fn);
3726 /* A qualified name corresponding to a bound pointer-to-member is
3727 represented as an OFFSET_REF:
3729 struct B { void g(); };
3731 void B::g() { (this->*p)(); } */
3732 if (TREE_CODE (fn) == OFFSET_REF)
3734 tree object_addr = cp_build_unary_op (ADDR_EXPR, object, 0,
3735 tf_warning_or_error);
3736 fn = TREE_OPERAND (fn, 1);
3737 fn = get_member_function_from_ptrfunc (&object_addr, fn);
3738 VEC_safe_insert (tree, gc, *args, 0, object_addr);
3741 expr = cp_build_function_call_vec (fn, args, tf_warning_or_error);
3742 if (processing_template_decl && expr != error_mark_node)
3743 expr = build_min_non_dep_call_vec (expr, orig_fn, orig_args);
3745 if (orig_args != NULL)
3746 release_tree_vector (orig_args);
3753 check_default_args (tree x)
3755 tree arg = TYPE_ARG_TYPES (TREE_TYPE (x));
3756 bool saw_def = false;
3757 int i = 0 - (TREE_CODE (TREE_TYPE (x)) == METHOD_TYPE);
3758 for (; arg && arg != void_list_node; arg = TREE_CHAIN (arg), ++i)
3760 if (TREE_PURPOSE (arg))
3764 error ("default argument missing for parameter %P of %q+#D", i, x);
3765 TREE_PURPOSE (arg) = error_mark_node;
3770 /* Return true if function DECL can be inlined. This is used to force
3771 instantiation of methods that might be interesting for inlining. */
3773 possibly_inlined_p (tree decl)
3775 gcc_assert (TREE_CODE (decl) == FUNCTION_DECL);
3776 if (DECL_UNINLINABLE (decl))
3778 if (!optimize || pragma_java_exceptions)
3779 return DECL_DECLARED_INLINE_P (decl);
3780 /* When optimizing, we might inline everything when flatten
3781 attribute or heuristics inlining for size or autoinlining
3786 /* Mark DECL (either a _DECL or a BASELINK) as "used" in the program.
3787 If DECL is a specialization or implicitly declared class member,
3788 generate the actual definition. */
3791 mark_used (tree decl)
3793 HOST_WIDE_INT saved_processing_template_decl = 0;
3795 /* If DECL is a BASELINK for a single function, then treat it just
3796 like the DECL for the function. Otherwise, if the BASELINK is
3797 for an overloaded function, we don't know which function was
3798 actually used until after overload resolution. */
3799 if (TREE_CODE (decl) == BASELINK)
3801 decl = BASELINK_FUNCTIONS (decl);
3802 if (really_overloaded_fn (decl))
3804 decl = OVL_CURRENT (decl);
3807 TREE_USED (decl) = 1;
3808 if (DECL_CLONED_FUNCTION_P (decl))
3809 TREE_USED (DECL_CLONED_FUNCTION (decl)) = 1;
3810 if (TREE_CODE (decl) == FUNCTION_DECL
3811 && DECL_DELETED_FN (decl))
3813 error ("deleted function %q+D", decl);
3814 error ("used here");
3817 /* If we don't need a value, then we don't need to synthesize DECL. */
3818 if (cp_unevaluated_operand != 0)
3821 /* If within finish_function, defer the rest until that function
3822 finishes, otherwise it might recurse. */
3823 if (defer_mark_used_calls)
3825 VEC_safe_push (tree, gc, deferred_mark_used_calls, decl);
3829 /* Normally, we can wait until instantiation-time to synthesize
3830 DECL. However, if DECL is a static data member initialized with
3831 a constant, we need the value right now because a reference to
3832 such a data member is not value-dependent. */
3833 if (TREE_CODE (decl) == VAR_DECL
3834 && DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl)
3835 && DECL_CLASS_SCOPE_P (decl))
3837 /* Don't try to instantiate members of dependent types. We
3838 cannot just use dependent_type_p here because this function
3839 may be called from fold_non_dependent_expr, and then we may
3840 see dependent types, even though processing_template_decl
3842 if (CLASSTYPE_TEMPLATE_INFO ((DECL_CONTEXT (decl)))
3843 && uses_template_parms (CLASSTYPE_TI_ARGS (DECL_CONTEXT (decl))))
3845 /* Pretend that we are not in a template, even if we are, so
3846 that the static data member initializer will be processed. */
3847 saved_processing_template_decl = processing_template_decl;
3848 processing_template_decl = 0;
3851 if (processing_template_decl)
3854 if (TREE_CODE (decl) == FUNCTION_DECL && DECL_DECLARED_INLINE_P (decl)
3855 && !TREE_ASM_WRITTEN (decl))
3856 /* Remember it, so we can check it was defined. */
3858 if (DECL_DEFERRED_FN (decl))
3861 /* Remember the current location for a function we will end up
3862 synthesizing. Then we can inform the user where it was
3863 required in the case of error. */
3864 if (DECL_ARTIFICIAL (decl) && DECL_NONSTATIC_MEMBER_FUNCTION_P (decl)
3865 && !DECL_THUNK_P (decl))
3866 DECL_SOURCE_LOCATION (decl) = input_location;
3868 note_vague_linkage_fn (decl);
3871 /* Is it a synthesized method that needs to be synthesized? */
3872 if (TREE_CODE (decl) == FUNCTION_DECL
3873 && DECL_NONSTATIC_MEMBER_FUNCTION_P (decl)
3874 && DECL_DEFAULTED_FN (decl)
3875 && !DECL_THUNK_P (decl)
3876 && ! DECL_INITIAL (decl)
3877 /* Kludge: don't synthesize for default args. Unfortunately this
3878 rules out initializers of namespace-scoped objects too, but
3879 it's sort-of ok if the implicit ctor or dtor decl keeps
3880 pointing to the class location. */
3881 && current_function_decl)
3883 synthesize_method (decl);
3884 /* If we've already synthesized the method we don't need to
3885 do the instantiation test below. */
3887 else if ((DECL_NON_THUNK_FUNCTION_P (decl) || TREE_CODE (decl) == VAR_DECL)
3888 && DECL_LANG_SPECIFIC (decl) && DECL_TEMPLATE_INFO (decl)
3889 && (!DECL_EXPLICIT_INSTANTIATION (decl)
3890 || (TREE_CODE (decl) == FUNCTION_DECL
3891 && possibly_inlined_p
3892 (DECL_TEMPLATE_RESULT (
3893 template_for_substitution (decl))))
3894 /* We need to instantiate static data members so that there
3895 initializers are available in integral constant
3897 || (TREE_CODE (decl) == VAR_DECL
3898 && DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl))))
3899 /* If this is a function or variable that is an instance of some
3900 template, we now know that we will need to actually do the
3901 instantiation. We check that DECL is not an explicit
3902 instantiation because that is not checked in instantiate_decl.
3904 We put off instantiating functions in order to improve compile
3905 times. Maintaining a stack of active functions is expensive,
3906 and the inliner knows to instantiate any functions it might
3907 need. Therefore, we always try to defer instantiation. */
3908 instantiate_decl (decl, /*defer_ok=*/true,
3909 /*expl_inst_class_mem_p=*/false);
3911 processing_template_decl = saved_processing_template_decl;
3914 #include "gt-cp-decl2.h"