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);
87 static bool decl_defined_p (tree);
89 /* A list of static class variables. This is needed, because a
90 static class variable can be declared inside the class without
91 an initializer, and then initialized, statically, outside the class. */
92 static GTY(()) VEC(tree,gc) *pending_statics;
94 /* A list of functions which were declared inline, but which we
95 may need to emit outline anyway. */
96 static GTY(()) VEC(tree,gc) *deferred_fns;
98 /* A list of decls that use types with no linkage, which we need to make
100 static GTY(()) VEC(tree,gc) *no_linkage_decls;
102 /* Nonzero if we're done parsing and into end-of-file activities. */
108 /* Return a member function type (a METHOD_TYPE), given FNTYPE (a
109 FUNCTION_TYPE), CTYPE (class type), and QUALS (the cv-qualifiers
110 that apply to the function). */
113 build_memfn_type (tree fntype, tree ctype, cp_cv_quals quals)
118 if (fntype == error_mark_node || ctype == error_mark_node)
119 return error_mark_node;
121 type_quals = quals & ~TYPE_QUAL_RESTRICT;
122 ctype = cp_build_qualified_type (ctype, type_quals);
123 fntype = build_method_type_directly (ctype, TREE_TYPE (fntype),
124 (TREE_CODE (fntype) == METHOD_TYPE
125 ? TREE_CHAIN (TYPE_ARG_TYPES (fntype))
126 : TYPE_ARG_TYPES (fntype)));
127 raises = TYPE_RAISES_EXCEPTIONS (fntype);
129 fntype = build_exception_variant (fntype, raises);
134 /* Build a PARM_DECL with NAME and TYPE, and set DECL_ARG_TYPE
138 cp_build_parm_decl (tree name, tree type)
140 tree parm = build_decl (input_location,
141 PARM_DECL, name, type);
142 /* DECL_ARG_TYPE is only used by the back end and the back end never
144 if (!processing_template_decl)
145 DECL_ARG_TYPE (parm) = type_passed_as (type);
147 /* If the type is a pack expansion, then we have a function
149 if (type && TREE_CODE (type) == TYPE_PACK_EXPANSION)
150 FUNCTION_PARAMETER_PACK_P (parm) = 1;
155 /* Returns a PARM_DECL for a parameter of the indicated TYPE, with the
159 build_artificial_parm (tree name, tree type)
161 tree parm = cp_build_parm_decl (name, type);
162 DECL_ARTIFICIAL (parm) = 1;
163 /* All our artificial parms are implicitly `const'; they cannot be
165 TREE_READONLY (parm) = 1;
169 /* Constructors for types with virtual baseclasses need an "in-charge" flag
170 saying whether this constructor is responsible for initialization of
171 virtual baseclasses or not. All destructors also need this "in-charge"
172 flag, which additionally determines whether or not the destructor should
173 free the memory for the object.
175 This function adds the "in-charge" flag to member function FN if
176 appropriate. It is called from grokclassfn and tsubst.
177 FN must be either a constructor or destructor.
179 The in-charge flag follows the 'this' parameter, and is followed by the
180 VTT parm (if any), then the user-written parms. */
183 maybe_retrofit_in_chrg (tree fn)
185 tree basetype, arg_types, parms, parm, fntype;
187 /* If we've already add the in-charge parameter don't do it again. */
188 if (DECL_HAS_IN_CHARGE_PARM_P (fn))
191 /* When processing templates we can't know, in general, whether or
192 not we're going to have virtual baseclasses. */
193 if (processing_template_decl)
196 /* We don't need an in-charge parameter for constructors that don't
197 have virtual bases. */
198 if (DECL_CONSTRUCTOR_P (fn)
199 && !CLASSTYPE_VBASECLASSES (DECL_CONTEXT (fn)))
202 arg_types = TYPE_ARG_TYPES (TREE_TYPE (fn));
203 basetype = TREE_TYPE (TREE_VALUE (arg_types));
204 arg_types = TREE_CHAIN (arg_types);
206 parms = TREE_CHAIN (DECL_ARGUMENTS (fn));
208 /* If this is a subobject constructor or destructor, our caller will
209 pass us a pointer to our VTT. */
210 if (CLASSTYPE_VBASECLASSES (DECL_CONTEXT (fn)))
212 parm = build_artificial_parm (vtt_parm_identifier, vtt_parm_type);
214 /* First add it to DECL_ARGUMENTS between 'this' and the real args... */
215 TREE_CHAIN (parm) = parms;
218 /* ...and then to TYPE_ARG_TYPES. */
219 arg_types = hash_tree_chain (vtt_parm_type, arg_types);
221 DECL_HAS_VTT_PARM_P (fn) = 1;
224 /* Then add the in-charge parm (before the VTT parm). */
225 parm = build_artificial_parm (in_charge_identifier, integer_type_node);
226 TREE_CHAIN (parm) = parms;
228 arg_types = hash_tree_chain (integer_type_node, arg_types);
230 /* Insert our new parameter(s) into the list. */
231 TREE_CHAIN (DECL_ARGUMENTS (fn)) = parms;
233 /* And rebuild the function type. */
234 fntype = build_method_type_directly (basetype, TREE_TYPE (TREE_TYPE (fn)),
236 if (TYPE_RAISES_EXCEPTIONS (TREE_TYPE (fn)))
237 fntype = build_exception_variant (fntype,
238 TYPE_RAISES_EXCEPTIONS (TREE_TYPE (fn)));
239 TREE_TYPE (fn) = fntype;
241 /* Now we've got the in-charge parameter. */
242 DECL_HAS_IN_CHARGE_PARM_P (fn) = 1;
245 /* Classes overload their constituent function names automatically.
246 When a function name is declared in a record structure,
247 its name is changed to it overloaded name. Since names for
248 constructors and destructors can conflict, we place a leading
251 CNAME is the name of the class we are grokking for.
253 FUNCTION is a FUNCTION_DECL. It was created by `grokdeclarator'.
255 FLAGS contains bits saying what's special about today's
256 arguments. 1 == DESTRUCTOR. 2 == OPERATOR.
258 If FUNCTION is a destructor, then we must add the `auto-delete' field
259 as a second parameter. There is some hair associated with the fact
260 that we must "declare" this variable in the manner consistent with the
261 way the rest of the arguments were declared.
263 QUALS are the qualifiers for the this pointer. */
266 grokclassfn (tree ctype, tree function, enum overload_flags flags)
268 tree fn_name = DECL_NAME (function);
270 /* Even within an `extern "C"' block, members get C++ linkage. See
271 [dcl.link] for details. */
272 SET_DECL_LANGUAGE (function, lang_cplusplus);
274 if (fn_name == NULL_TREE)
276 error ("name missing for member function");
277 fn_name = get_identifier ("<anonymous>");
278 DECL_NAME (function) = fn_name;
281 DECL_CONTEXT (function) = ctype;
283 if (flags == DTOR_FLAG)
284 DECL_DESTRUCTOR_P (function) = 1;
286 if (flags == DTOR_FLAG || DECL_CONSTRUCTOR_P (function))
287 maybe_retrofit_in_chrg (function);
290 /* Create an ARRAY_REF, checking for the user doing things backwards
294 grok_array_decl (tree array_expr, tree index_exp)
298 tree orig_array_expr = array_expr;
299 tree orig_index_exp = index_exp;
301 if (error_operand_p (array_expr) || error_operand_p (index_exp))
302 return error_mark_node;
304 if (processing_template_decl)
306 if (type_dependent_expression_p (array_expr)
307 || type_dependent_expression_p (index_exp))
308 return build_min_nt (ARRAY_REF, array_expr, index_exp,
309 NULL_TREE, NULL_TREE);
310 array_expr = build_non_dependent_expr (array_expr);
311 index_exp = build_non_dependent_expr (index_exp);
314 type = TREE_TYPE (array_expr);
316 type = non_reference (type);
318 /* If they have an `operator[]', use that. */
319 if (MAYBE_CLASS_TYPE_P (type) || MAYBE_CLASS_TYPE_P (TREE_TYPE (index_exp)))
320 expr = build_new_op (ARRAY_REF, LOOKUP_NORMAL,
321 array_expr, index_exp, NULL_TREE,
322 /*overloaded_p=*/NULL, tf_warning_or_error);
327 /* Otherwise, create an ARRAY_REF for a pointer or array type.
328 It is a little-known fact that, if `a' is an array and `i' is
329 an int, you can write `i[a]', which means the same thing as
331 if (TREE_CODE (type) == ARRAY_TYPE)
334 p1 = build_expr_type_conversion (WANT_POINTER, array_expr, false);
336 if (TREE_CODE (TREE_TYPE (index_exp)) == ARRAY_TYPE)
339 p2 = build_expr_type_conversion (WANT_POINTER, index_exp, false);
341 i1 = build_expr_type_conversion (WANT_INT | WANT_ENUM, array_expr,
343 i2 = build_expr_type_conversion (WANT_INT | WANT_ENUM, index_exp,
346 if ((p1 && i2) && (i1 && p2))
347 error ("ambiguous conversion for array subscript");
350 array_expr = p1, index_exp = i2;
352 array_expr = p2, index_exp = i1;
355 error ("invalid types %<%T[%T]%> for array subscript",
356 type, TREE_TYPE (index_exp));
357 return error_mark_node;
360 if (array_expr == error_mark_node || index_exp == error_mark_node)
361 error ("ambiguous conversion for array subscript");
363 expr = build_array_ref (input_location, array_expr, index_exp);
365 if (processing_template_decl && expr != error_mark_node)
366 return build_min_non_dep (ARRAY_REF, expr, orig_array_expr, orig_index_exp,
367 NULL_TREE, NULL_TREE);
371 /* Given the cast expression EXP, checking out its validity. Either return
372 an error_mark_node if there was an unavoidable error, return a cast to
373 void for trying to delete a pointer w/ the value 0, or return the
374 call to delete. If DOING_VEC is true, we handle things differently
375 for doing an array delete.
376 Implements ARM $5.3.4. This is called from the parser. */
379 delete_sanity (tree exp, tree size, bool doing_vec, int use_global_delete)
383 if (exp == error_mark_node)
386 if (processing_template_decl)
388 t = build_min (DELETE_EXPR, void_type_node, exp, size);
389 DELETE_EXPR_USE_GLOBAL (t) = use_global_delete;
390 DELETE_EXPR_USE_VEC (t) = doing_vec;
391 TREE_SIDE_EFFECTS (t) = 1;
395 /* An array can't have been allocated by new, so complain. */
396 if (TREE_CODE (exp) == VAR_DECL
397 && TREE_CODE (TREE_TYPE (exp)) == ARRAY_TYPE)
398 warning (0, "deleting array %q#D", exp);
400 t = build_expr_type_conversion (WANT_POINTER, exp, true);
402 if (t == NULL_TREE || t == error_mark_node)
404 error ("type %q#T argument given to %<delete%>, expected pointer",
406 return error_mark_node;
409 type = TREE_TYPE (t);
411 /* As of Valley Forge, you can delete a pointer to const. */
413 /* You can't delete functions. */
414 if (TREE_CODE (TREE_TYPE (type)) == FUNCTION_TYPE)
416 error ("cannot delete a function. Only pointer-to-objects are "
417 "valid arguments to %<delete%>");
418 return error_mark_node;
421 /* Deleting ptr to void is undefined behavior [expr.delete/3]. */
422 if (TREE_CODE (TREE_TYPE (type)) == VOID_TYPE)
424 warning (0, "deleting %qT is undefined", type);
428 /* Deleting a pointer with the value zero is valid and has no effect. */
429 if (integer_zerop (t))
430 return build1 (NOP_EXPR, void_type_node, t);
433 return build_vec_delete (t, /*maxindex=*/NULL_TREE,
434 sfk_deleting_destructor,
437 return build_delete (type, t, sfk_deleting_destructor,
438 LOOKUP_NORMAL, use_global_delete);
441 /* Report an error if the indicated template declaration is not the
442 sort of thing that should be a member template. */
445 check_member_template (tree tmpl)
449 gcc_assert (TREE_CODE (tmpl) == TEMPLATE_DECL);
450 decl = DECL_TEMPLATE_RESULT (tmpl);
452 if (TREE_CODE (decl) == FUNCTION_DECL
453 || (TREE_CODE (decl) == TYPE_DECL
454 && MAYBE_CLASS_TYPE_P (TREE_TYPE (decl))))
456 /* The parser rejects template declarations in local classes. */
457 gcc_assert (!current_function_decl);
458 /* The parser rejects any use of virtual in a function template. */
459 gcc_assert (!(TREE_CODE (decl) == FUNCTION_DECL
460 && DECL_VIRTUAL_P (decl)));
462 /* The debug-information generating code doesn't know what to do
463 with member templates. */
464 DECL_IGNORED_P (tmpl) = 1;
467 error ("template declaration of %q#D", decl);
470 /* Return true iff TYPE is a valid Java parameter or return type. */
473 acceptable_java_type (tree type)
475 if (type == error_mark_node)
478 if (TREE_CODE (type) == VOID_TYPE || TYPE_FOR_JAVA (type))
480 if (TREE_CODE (type) == POINTER_TYPE || TREE_CODE (type) == REFERENCE_TYPE)
482 type = TREE_TYPE (type);
483 if (TREE_CODE (type) == RECORD_TYPE)
486 if (! TYPE_FOR_JAVA (type))
488 if (! CLASSTYPE_TEMPLATE_INFO (type))
490 args = CLASSTYPE_TI_ARGS (type);
491 i = TREE_VEC_LENGTH (args);
494 type = TREE_VEC_ELT (args, i);
495 if (TREE_CODE (type) == POINTER_TYPE)
496 type = TREE_TYPE (type);
497 if (! TYPE_FOR_JAVA (type))
506 /* For a METHOD in a Java class CTYPE, return true if
507 the parameter and return types are valid Java types.
508 Otherwise, print appropriate error messages, and return false. */
511 check_java_method (tree method)
514 tree arg_types = TYPE_ARG_TYPES (TREE_TYPE (method));
515 tree ret_type = TREE_TYPE (TREE_TYPE (method));
517 if (!acceptable_java_type (ret_type))
519 error ("Java method %qD has non-Java return type %qT",
524 arg_types = TREE_CHAIN (arg_types);
525 if (DECL_HAS_IN_CHARGE_PARM_P (method))
526 arg_types = TREE_CHAIN (arg_types);
527 if (DECL_HAS_VTT_PARM_P (method))
528 arg_types = TREE_CHAIN (arg_types);
530 for (; arg_types != NULL_TREE; arg_types = TREE_CHAIN (arg_types))
532 tree type = TREE_VALUE (arg_types);
533 if (!acceptable_java_type (type))
535 if (type != error_mark_node)
536 error ("Java method %qD has non-Java parameter type %qT",
544 /* Sanity check: report error if this function FUNCTION is not
545 really a member of the class (CTYPE) it is supposed to belong to.
546 TEMPLATE_PARMS is used to specify the template parameters of a member
547 template passed as FUNCTION_DECL. If the member template is passed as a
548 TEMPLATE_DECL, it can be NULL since the parameters can be extracted
549 from the declaration. If the function is not a function template, it
551 It returns the original declaration for the function, NULL_TREE if
552 no declaration was found, error_mark_node if an error was emitted. */
555 check_classfn (tree ctype, tree function, tree template_parms)
561 if (DECL_USE_TEMPLATE (function)
562 && !(TREE_CODE (function) == TEMPLATE_DECL
563 && DECL_TEMPLATE_SPECIALIZATION (function))
564 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (function)))
565 /* Since this is a specialization of a member template,
566 we're not going to find the declaration in the class.
569 struct S { template <typename T> void f(T); };
570 template <> void S::f(int);
572 we're not going to find `S::f(int)', but there's no
573 reason we should, either. We let our callers know we didn't
574 find the method, but we don't complain. */
577 /* Basic sanity check: for a template function, the template parameters
578 either were not passed, or they are the same of DECL_TEMPLATE_PARMS. */
579 if (TREE_CODE (function) == TEMPLATE_DECL)
582 && !comp_template_parms (template_parms,
583 DECL_TEMPLATE_PARMS (function)))
585 error ("template parameter lists provided don't match the "
586 "template parameters of %qD", function);
587 return error_mark_node;
589 template_parms = DECL_TEMPLATE_PARMS (function);
592 /* OK, is this a definition of a member template? */
593 is_template = (template_parms != NULL_TREE);
595 /* We must enter the scope here, because conversion operators are
596 named by target type, and type equivalence relies on typenames
597 resolving within the scope of CTYPE. */
598 pushed_scope = push_scope (ctype);
599 ix = class_method_index_for_fn (complete_type (ctype), function);
602 VEC(tree,gc) *methods = CLASSTYPE_METHOD_VEC (ctype);
603 tree fndecls, fndecl = 0;
605 const char *format = NULL;
607 for (fndecls = VEC_index (tree, methods, ix);
608 fndecls; fndecls = OVL_NEXT (fndecls))
612 fndecl = OVL_CURRENT (fndecls);
613 p1 = TYPE_ARG_TYPES (TREE_TYPE (function));
614 p2 = TYPE_ARG_TYPES (TREE_TYPE (fndecl));
616 /* We cannot simply call decls_match because this doesn't
617 work for static member functions that are pretending to
618 be methods, and because the name may have been changed by
621 /* Get rid of the this parameter on functions that become
623 if (DECL_STATIC_FUNCTION_P (fndecl)
624 && TREE_CODE (TREE_TYPE (function)) == METHOD_TYPE)
625 p1 = TREE_CHAIN (p1);
627 /* A member template definition only matches a member template
629 if (is_template != (TREE_CODE (fndecl) == TEMPLATE_DECL))
632 if (same_type_p (TREE_TYPE (TREE_TYPE (function)),
633 TREE_TYPE (TREE_TYPE (fndecl)))
634 && compparms (p1, p2)
636 || comp_template_parms (template_parms,
637 DECL_TEMPLATE_PARMS (fndecl)))
638 && (DECL_TEMPLATE_SPECIALIZATION (function)
639 == DECL_TEMPLATE_SPECIALIZATION (fndecl))
640 && (!DECL_TEMPLATE_SPECIALIZATION (function)
641 || (DECL_TI_TEMPLATE (function)
642 == DECL_TI_TEMPLATE (fndecl))))
648 pop_scope (pushed_scope);
649 return OVL_CURRENT (fndecls);
652 error_at (DECL_SOURCE_LOCATION (function),
653 "prototype for %q#D does not match any in class %qT",
655 is_conv_op = DECL_CONV_FN_P (fndecl);
658 ix = CLASSTYPE_FIRST_CONVERSION_SLOT;
659 fndecls = VEC_index (tree, methods, ix);
662 fndecl = OVL_CURRENT (fndecls);
663 fndecls = OVL_NEXT (fndecls);
665 if (!fndecls && is_conv_op)
667 if (VEC_length (tree, methods) > (size_t) ++ix)
669 fndecls = VEC_index (tree, methods, ix);
670 if (!DECL_CONV_FN_P (OVL_CURRENT (fndecls)))
682 format = N_("candidates are: %+#D");
684 format = N_("candidate is: %+#D");
685 error (format, fndecl);
688 else if (!COMPLETE_TYPE_P (ctype))
689 cxx_incomplete_type_error (function, ctype);
691 error ("no %q#D member function declared in class %qT",
695 pop_scope (pushed_scope);
696 return error_mark_node;
699 /* DECL is a function with vague linkage. Remember it so that at the
700 end of the translation unit we can decide whether or not to emit
704 note_vague_linkage_fn (tree decl)
706 if (!DECL_DEFERRED_FN (decl))
708 DECL_DEFERRED_FN (decl) = 1;
709 DECL_DEFER_OUTPUT (decl) = 1;
710 VEC_safe_push (tree, gc, deferred_fns, decl);
714 /* We have just processed the DECL, which is a static data member.
715 The other parameters are as for cp_finish_decl. */
718 finish_static_data_member_decl (tree decl,
719 tree init, bool init_const_expr_p,
723 DECL_CONTEXT (decl) = current_class_type;
725 /* We cannot call pushdecl here, because that would fill in the
726 TREE_CHAIN of our decl. Instead, we modify cp_finish_decl to do
727 the right thing, namely, to put this decl out straight away. */
729 if (! processing_template_decl)
730 VEC_safe_push (tree, gc, pending_statics, decl);
732 if (LOCAL_CLASS_P (current_class_type))
733 permerror (input_location, "local class %q#T shall not have static data member %q#D",
734 current_class_type, decl);
736 /* Static consts need not be initialized in the class definition. */
737 if (init != NULL_TREE && TYPE_NEEDS_CONSTRUCTING (TREE_TYPE (decl)))
739 static int explained = 0;
741 error ("initializer invalid for static member with constructor");
744 error ("(an out of class initialization is required)");
749 /* Force the compiler to know when an uninitialized static const
750 member is being used. */
751 if (CP_TYPE_CONST_P (TREE_TYPE (decl)) && init == 0)
752 TREE_USED (decl) = 1;
753 DECL_INITIAL (decl) = init;
754 DECL_IN_AGGR_P (decl) = 1;
756 cp_finish_decl (decl, init, init_const_expr_p, asmspec_tree, flags);
759 /* DECLARATOR and DECLSPECS correspond to a class member. The other
760 parameters are as for cp_finish_decl. Return the DECL for the
761 class member declared. */
764 grokfield (const cp_declarator *declarator,
765 cp_decl_specifier_seq *declspecs,
766 tree init, bool init_const_expr_p,
771 const char *asmspec = 0;
772 int flags = LOOKUP_ONLYCONVERTING;
775 && TREE_CODE (init) == TREE_LIST
776 && TREE_VALUE (init) == error_mark_node
777 && TREE_CHAIN (init) == NULL_TREE)
780 value = grokdeclarator (declarator, declspecs, FIELD, init != 0, &attrlist);
781 if (! value || error_operand_p (value))
782 /* friend or constructor went bad. */
783 return error_mark_node;
785 if (TREE_CODE (value) == TYPE_DECL && init)
787 error ("typedef %qD is initialized (use __typeof__ instead)", value);
791 /* Pass friendly classes back. */
792 if (value == void_type_node)
795 /* Pass friend decls back. */
796 if ((TREE_CODE (value) == FUNCTION_DECL
797 || TREE_CODE (value) == TEMPLATE_DECL)
798 && DECL_CONTEXT (value) != current_class_type)
801 if (DECL_NAME (value) != NULL_TREE
802 && IDENTIFIER_POINTER (DECL_NAME (value))[0] == '_'
803 && ! strcmp (IDENTIFIER_POINTER (DECL_NAME (value)), "_vptr"))
804 error ("member %qD conflicts with virtual function table field name",
807 /* Stash away type declarations. */
808 if (TREE_CODE (value) == TYPE_DECL)
810 DECL_NONLOCAL (value) = 1;
811 DECL_CONTEXT (value) = current_class_type;
813 if (processing_template_decl)
814 value = push_template_decl (value);
820 /* If this is a typedef that names the class for linkage purposes
821 (7.1.3p8), apply any attributes directly to the type. */
822 if (TAGGED_TYPE_P (TREE_TYPE (value))
823 && value == TYPE_NAME (TYPE_MAIN_VARIANT (TREE_TYPE (value))))
824 attrflags = ATTR_FLAG_TYPE_IN_PLACE;
826 cplus_decl_attributes (&value, attrlist, attrflags);
829 if (declspecs->specs[(int)ds_typedef]
830 && TREE_TYPE (value) != error_mark_node
831 && TYPE_NAME (TYPE_MAIN_VARIANT (TREE_TYPE (value))) != value)
832 set_underlying_type (value);
837 if (DECL_IN_AGGR_P (value))
839 error ("%qD is already defined in %qT", value, DECL_CONTEXT (value));
840 return void_type_node;
843 if (asmspec_tree && asmspec_tree != error_mark_node)
844 asmspec = TREE_STRING_POINTER (asmspec_tree);
848 if (TREE_CODE (value) == FUNCTION_DECL)
850 /* Initializers for functions are rejected early in the parser.
851 If we get here, it must be a pure specifier for a method. */
852 if (init == ridpointers[(int)RID_DELETE])
854 DECL_DELETED_FN (value) = 1;
855 DECL_DECLARED_INLINE_P (value) = 1;
856 DECL_INITIAL (value) = error_mark_node;
858 else if (init == ridpointers[(int)RID_DEFAULT])
860 if (!defaultable_fn_p (value))
861 error ("%qD cannot be defaulted", value);
864 DECL_DEFAULTED_FN (value) = 1;
865 DECL_INITIALIZED_IN_CLASS_P (value) = 1;
866 DECL_DECLARED_INLINE_P (value) = 1;
869 else if (TREE_CODE (TREE_TYPE (value)) == METHOD_TYPE)
871 gcc_assert (error_operand_p (init) || integer_zerop (init));
872 DECL_PURE_VIRTUAL_P (value) = 1;
876 gcc_assert (TREE_CODE (TREE_TYPE (value)) == FUNCTION_TYPE);
877 error ("initializer specified for static member function %qD",
881 else if (pedantic && TREE_CODE (value) != VAR_DECL)
882 /* Already complained in grokdeclarator. */
884 else if (!processing_template_decl)
886 if (TREE_CODE (init) == CONSTRUCTOR)
887 init = digest_init (TREE_TYPE (value), init);
889 init = integral_constant_value (init);
891 if (init != error_mark_node && !TREE_CONSTANT (init))
893 /* We can allow references to things that are effectively
894 static, since references are initialized with the
896 if (TREE_CODE (TREE_TYPE (value)) != REFERENCE_TYPE
897 || (TREE_STATIC (init) == 0
898 && (!DECL_P (init) || DECL_EXTERNAL (init) == 0)))
900 error ("field initializer is not constant");
901 init = error_mark_node;
907 if (processing_template_decl
908 && (TREE_CODE (value) == VAR_DECL || TREE_CODE (value) == FUNCTION_DECL))
910 value = push_template_decl (value);
911 if (error_operand_p (value))
912 return error_mark_node;
916 cplus_decl_attributes (&value, attrlist, 0);
918 switch (TREE_CODE (value))
921 finish_static_data_member_decl (value, init, init_const_expr_p,
922 asmspec_tree, flags);
927 error ("%<asm%> specifiers are not permitted on non-static data members");
928 if (DECL_INITIAL (value) == error_mark_node)
929 init = error_mark_node;
930 cp_finish_decl (value, init, /*init_const_expr_p=*/false,
932 DECL_INITIAL (value) = init;
933 DECL_IN_AGGR_P (value) = 1;
938 set_user_assembler_name (value, asmspec);
940 cp_finish_decl (value,
942 /*init_const_expr_p=*/false,
943 asmspec_tree, flags);
945 /* Pass friends back this way. */
946 if (DECL_FRIEND_P (value))
947 return void_type_node;
949 DECL_IN_AGGR_P (value) = 1;
958 /* Like `grokfield', but for bitfields.
959 WIDTH is non-NULL for bit fields only, and is an INTEGER_CST node. */
962 grokbitfield (const cp_declarator *declarator,
963 cp_decl_specifier_seq *declspecs, tree width,
966 tree value = grokdeclarator (declarator, declspecs, BITFIELD, 0, &attrlist);
968 if (value == error_mark_node)
969 return NULL_TREE; /* friends went bad. */
971 /* Pass friendly classes back. */
972 if (TREE_CODE (value) == VOID_TYPE)
973 return void_type_node;
975 if (!INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (TREE_TYPE (value))
976 && (POINTER_TYPE_P (value)
977 || !dependent_type_p (TREE_TYPE (value))))
979 error ("bit-field %qD with non-integral type", value);
980 return error_mark_node;
983 if (TREE_CODE (value) == TYPE_DECL)
985 error ("cannot declare %qD to be a bit-field type", value);
989 /* Usually, finish_struct_1 catches bitfields with invalid types.
990 But, in the case of bitfields with function type, we confuse
991 ourselves into thinking they are member functions, so we must
993 if (TREE_CODE (value) == FUNCTION_DECL)
995 error ("cannot declare bit-field %qD with function type",
1000 if (DECL_IN_AGGR_P (value))
1002 error ("%qD is already defined in the class %qT", value,
1003 DECL_CONTEXT (value));
1004 return void_type_node;
1007 if (TREE_STATIC (value))
1009 error ("static member %qD cannot be a bit-field", value);
1012 cp_finish_decl (value, NULL_TREE, false, NULL_TREE, 0);
1014 if (width != error_mark_node)
1016 constant_expression_warning (width);
1017 DECL_INITIAL (value) = width;
1018 SET_DECL_C_BIT_FIELD (value);
1021 DECL_IN_AGGR_P (value) = 1;
1024 cplus_decl_attributes (&value, attrlist, /*flags=*/0);
1030 /* Returns true iff ATTR is an attribute which needs to be applied at
1031 instantiation time rather than template definition time. */
1034 is_late_template_attribute (tree attr, tree decl)
1036 tree name = TREE_PURPOSE (attr);
1037 tree args = TREE_VALUE (attr);
1038 const struct attribute_spec *spec = lookup_attribute_spec (name);
1042 /* Unknown attribute. */
1045 /* Attribute weak handling wants to write out assembly right away. */
1046 if (is_attribute_p ("weak", name))
1049 /* If any of the arguments are dependent expressions, we can't evaluate
1050 the attribute until instantiation time. */
1051 for (arg = args; arg; arg = TREE_CHAIN (arg))
1053 tree t = TREE_VALUE (arg);
1055 /* If the first attribute argument is an identifier, only consider
1056 second and following arguments. Attributes like mode, format,
1057 cleanup and several target specific attributes aren't late
1058 just because they have an IDENTIFIER_NODE as first argument. */
1059 if (arg == args && TREE_CODE (t) == IDENTIFIER_NODE)
1062 if (value_dependent_expression_p (t)
1063 || type_dependent_expression_p (t))
1067 if (TREE_CODE (decl) == TYPE_DECL
1069 || spec->type_required)
1071 tree type = TYPE_P (decl) ? decl : TREE_TYPE (decl);
1073 /* We can't apply any attributes to a completely unknown type until
1074 instantiation time. */
1075 enum tree_code code = TREE_CODE (type);
1076 if (code == TEMPLATE_TYPE_PARM
1077 || code == BOUND_TEMPLATE_TEMPLATE_PARM
1078 || code == TYPENAME_TYPE)
1080 /* Also defer most attributes on dependent types. This is not
1081 necessary in all cases, but is the better default. */
1082 else if (dependent_type_p (type)
1083 /* But attribute visibility specifically works on
1085 && !is_attribute_p ("visibility", name))
1094 /* ATTR_P is a list of attributes. Remove any attributes which need to be
1095 applied at instantiation time and return them. If IS_DEPENDENT is true,
1096 the declaration itself is dependent, so all attributes should be applied
1097 at instantiation time. */
1100 splice_template_attributes (tree *attr_p, tree decl)
1103 tree late_attrs = NULL_TREE;
1104 tree *q = &late_attrs;
1111 if (is_late_template_attribute (*p, decl))
1113 ATTR_IS_DEPENDENT (*p) = 1;
1115 *p = TREE_CHAIN (*p);
1116 q = &TREE_CHAIN (*q);
1120 p = &TREE_CHAIN (*p);
1126 /* Remove any late attributes from the list in ATTR_P and attach them to
1130 save_template_attributes (tree *attr_p, tree *decl_p)
1132 tree late_attrs = splice_template_attributes (attr_p, *decl_p);
1134 tree old_attrs = NULL_TREE;
1139 if (DECL_P (*decl_p))
1140 q = &DECL_ATTRIBUTES (*decl_p);
1142 q = &TYPE_ATTRIBUTES (*decl_p);
1146 /* Place the late attributes at the beginning of the attribute
1148 TREE_CHAIN (tree_last (late_attrs)) = *q;
1151 if (!DECL_P (*decl_p) && *decl_p == TYPE_MAIN_VARIANT (*decl_p))
1153 /* We've added new attributes directly to the main variant, so
1154 now we need to update all of the other variants to include
1155 these new attributes. */
1157 for (variant = TYPE_NEXT_VARIANT (*decl_p); variant;
1158 variant = TYPE_NEXT_VARIANT (variant))
1160 gcc_assert (TYPE_ATTRIBUTES (variant) == old_attrs);
1161 TYPE_ATTRIBUTES (variant) = TYPE_ATTRIBUTES (*decl_p);
1166 /* Like reconstruct_complex_type, but handle also template trees. */
1169 cp_reconstruct_complex_type (tree type, tree bottom)
1173 if (TREE_CODE (type) == POINTER_TYPE)
1175 inner = cp_reconstruct_complex_type (TREE_TYPE (type), bottom);
1176 outer = build_pointer_type_for_mode (inner, TYPE_MODE (type),
1177 TYPE_REF_CAN_ALIAS_ALL (type));
1179 else if (TREE_CODE (type) == REFERENCE_TYPE)
1181 inner = cp_reconstruct_complex_type (TREE_TYPE (type), bottom);
1182 outer = build_reference_type_for_mode (inner, TYPE_MODE (type),
1183 TYPE_REF_CAN_ALIAS_ALL (type));
1185 else if (TREE_CODE (type) == ARRAY_TYPE)
1187 inner = cp_reconstruct_complex_type (TREE_TYPE (type), bottom);
1188 outer = build_cplus_array_type (inner, TYPE_DOMAIN (type));
1189 /* Don't call cp_build_qualified_type on ARRAY_TYPEs, the
1190 element type qualification will be handled by the recursive
1191 cp_reconstruct_complex_type call and cp_build_qualified_type
1192 for ARRAY_TYPEs changes the element type. */
1195 else if (TREE_CODE (type) == FUNCTION_TYPE)
1197 inner = cp_reconstruct_complex_type (TREE_TYPE (type), bottom);
1198 outer = build_function_type (inner, TYPE_ARG_TYPES (type));
1200 else if (TREE_CODE (type) == METHOD_TYPE)
1202 inner = cp_reconstruct_complex_type (TREE_TYPE (type), bottom);
1203 /* The build_method_type_directly() routine prepends 'this' to argument list,
1204 so we must compensate by getting rid of it. */
1206 = build_method_type_directly
1207 (TREE_TYPE (TREE_VALUE (TYPE_ARG_TYPES (type))),
1209 TREE_CHAIN (TYPE_ARG_TYPES (type)));
1211 else if (TREE_CODE (type) == OFFSET_TYPE)
1213 inner = cp_reconstruct_complex_type (TREE_TYPE (type), bottom);
1214 outer = build_offset_type (TYPE_OFFSET_BASETYPE (type), inner);
1219 return cp_build_qualified_type (outer, TYPE_QUALS (type));
1222 /* Like decl_attributes, but handle C++ complexity. */
1225 cplus_decl_attributes (tree *decl, tree attributes, int flags)
1227 if (*decl == NULL_TREE || *decl == void_type_node
1228 || *decl == error_mark_node
1229 || attributes == NULL_TREE)
1232 if (processing_template_decl)
1234 if (check_for_bare_parameter_packs (attributes))
1237 save_template_attributes (&attributes, decl);
1238 if (attributes == NULL_TREE)
1242 if (TREE_CODE (*decl) == TEMPLATE_DECL)
1243 decl = &DECL_TEMPLATE_RESULT (*decl);
1245 decl_attributes (decl, attributes, flags);
1247 if (TREE_CODE (*decl) == TYPE_DECL)
1248 SET_IDENTIFIER_TYPE_VALUE (DECL_NAME (*decl), TREE_TYPE (*decl));
1251 /* Walks through the namespace- or function-scope anonymous union
1252 OBJECT, with the indicated TYPE, building appropriate VAR_DECLs.
1253 Returns one of the fields for use in the mangled name. */
1256 build_anon_union_vars (tree type, tree object)
1258 tree main_decl = NULL_TREE;
1261 /* Rather than write the code to handle the non-union case,
1262 just give an error. */
1263 if (TREE_CODE (type) != UNION_TYPE)
1264 error ("anonymous struct not inside named type");
1266 for (field = TYPE_FIELDS (type);
1268 field = TREE_CHAIN (field))
1273 if (DECL_ARTIFICIAL (field))
1275 if (TREE_CODE (field) != FIELD_DECL)
1277 permerror (input_location, "%q+#D invalid; an anonymous union can only "
1278 "have non-static data members", field);
1282 if (TREE_PRIVATE (field))
1283 permerror (input_location, "private member %q+#D in anonymous union", field);
1284 else if (TREE_PROTECTED (field))
1285 permerror (input_location, "protected member %q+#D in anonymous union", field);
1287 if (processing_template_decl)
1288 ref = build_min_nt (COMPONENT_REF, object,
1289 DECL_NAME (field), NULL_TREE);
1291 ref = build_class_member_access_expr (object, field, NULL_TREE,
1292 false, tf_warning_or_error);
1294 if (DECL_NAME (field))
1298 decl = build_decl (input_location,
1299 VAR_DECL, DECL_NAME (field), TREE_TYPE (field));
1300 DECL_ANON_UNION_VAR_P (decl) = 1;
1302 base = get_base_address (object);
1303 TREE_PUBLIC (decl) = TREE_PUBLIC (base);
1304 TREE_STATIC (decl) = TREE_STATIC (base);
1305 DECL_EXTERNAL (decl) = DECL_EXTERNAL (base);
1307 SET_DECL_VALUE_EXPR (decl, ref);
1308 DECL_HAS_VALUE_EXPR_P (decl) = 1;
1310 decl = pushdecl (decl);
1312 else if (ANON_AGGR_TYPE_P (TREE_TYPE (field)))
1313 decl = build_anon_union_vars (TREE_TYPE (field), ref);
1317 if (main_decl == NULL_TREE)
1324 /* Finish off the processing of a UNION_TYPE structure. If the union is an
1325 anonymous union, then all members must be laid out together. PUBLIC_P
1326 is nonzero if this union is not declared static. */
1329 finish_anon_union (tree anon_union_decl)
1335 if (anon_union_decl == error_mark_node)
1338 type = TREE_TYPE (anon_union_decl);
1339 public_p = TREE_PUBLIC (anon_union_decl);
1341 /* The VAR_DECL's context is the same as the TYPE's context. */
1342 DECL_CONTEXT (anon_union_decl) = DECL_CONTEXT (TYPE_NAME (type));
1344 if (TYPE_FIELDS (type) == NULL_TREE)
1349 error ("namespace-scope anonymous aggregates must be static");
1353 main_decl = build_anon_union_vars (type, anon_union_decl);
1354 if (main_decl == error_mark_node)
1356 if (main_decl == NULL_TREE)
1358 warning (0, "anonymous union with no members");
1362 if (!processing_template_decl)
1364 /* Use main_decl to set the mangled name. */
1365 DECL_NAME (anon_union_decl) = DECL_NAME (main_decl);
1366 maybe_commonize_var (anon_union_decl);
1367 mangle_decl (anon_union_decl);
1368 DECL_NAME (anon_union_decl) = NULL_TREE;
1371 pushdecl (anon_union_decl);
1372 if (building_stmt_tree ()
1373 && at_function_scope_p ())
1374 add_decl_expr (anon_union_decl);
1375 else if (!processing_template_decl)
1376 rest_of_decl_compilation (anon_union_decl,
1377 toplevel_bindings_p (), at_eof);
1380 /* Auxiliary functions to make type signatures for
1381 `operator new' and `operator delete' correspond to
1382 what compiler will be expecting. */
1385 coerce_new_type (tree type)
1388 tree args = TYPE_ARG_TYPES (type);
1390 gcc_assert (TREE_CODE (type) == FUNCTION_TYPE);
1392 if (!same_type_p (TREE_TYPE (type), ptr_type_node))
1395 error ("%<operator new%> must return type %qT", ptr_type_node);
1398 if (args && args != void_list_node)
1400 if (TREE_PURPOSE (args))
1402 /* [basic.stc.dynamic.allocation]
1404 The first parameter shall not have an associated default
1406 error ("the first parameter of %<operator new%> cannot "
1407 "have a default argument");
1408 /* Throw away the default argument. */
1409 TREE_PURPOSE (args) = NULL_TREE;
1412 if (!same_type_p (TREE_VALUE (args), size_type_node))
1415 args = TREE_CHAIN (args);
1422 permerror (input_location, "%<operator new%> takes type %<size_t%> (%qT) "
1423 "as first parameter", size_type_node);
1428 args = tree_cons (NULL_TREE, size_type_node, args);
1431 type = build_exception_variant
1432 (build_function_type (ptr_type_node, args),
1433 TYPE_RAISES_EXCEPTIONS (type));
1441 coerce_delete_type (tree type)
1444 tree args = TYPE_ARG_TYPES (type);
1446 gcc_assert (TREE_CODE (type) == FUNCTION_TYPE);
1448 if (!same_type_p (TREE_TYPE (type), void_type_node))
1451 error ("%<operator delete%> must return type %qT", void_type_node);
1454 if (!args || args == void_list_node
1455 || !same_type_p (TREE_VALUE (args), ptr_type_node))
1458 if (args && args != void_list_node)
1459 args = TREE_CHAIN (args);
1460 error ("%<operator delete%> takes type %qT as first parameter",
1466 args = tree_cons (NULL_TREE, ptr_type_node, args);
1469 type = build_exception_variant
1470 (build_function_type (void_type_node, args),
1471 TYPE_RAISES_EXCEPTIONS (type));
1479 /* DECL is a VAR_DECL for a vtable: walk through the entries in the vtable
1480 and mark them as needed. */
1483 mark_vtable_entries (tree decl)
1486 unsigned HOST_WIDE_INT idx;
1488 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (DECL_INITIAL (decl)),
1493 STRIP_NOPS (fnaddr);
1495 if (TREE_CODE (fnaddr) != ADDR_EXPR
1496 && TREE_CODE (fnaddr) != FDESC_EXPR)
1497 /* This entry is an offset: a virtual base class offset, a
1498 virtual call offset, an RTTI offset, etc. */
1501 fn = TREE_OPERAND (fnaddr, 0);
1502 TREE_ADDRESSABLE (fn) = 1;
1503 /* When we don't have vcall offsets, we output thunks whenever
1504 we output the vtables that contain them. With vcall offsets,
1505 we know all the thunks we'll need when we emit a virtual
1506 function, so we emit the thunks there instead. */
1507 if (DECL_THUNK_P (fn))
1508 use_thunk (fn, /*emit_p=*/0);
1513 /* Set DECL up to have the closest approximation of "initialized common"
1514 linkage available. */
1517 comdat_linkage (tree decl)
1520 make_decl_one_only (decl, cxx_comdat_group (decl));
1521 else if (TREE_CODE (decl) == FUNCTION_DECL
1522 || (TREE_CODE (decl) == VAR_DECL && DECL_ARTIFICIAL (decl)))
1523 /* We can just emit function and compiler-generated variables
1524 statically; having multiple copies is (for the most part) only
1527 There are two correctness issues, however: the address of a
1528 template instantiation with external linkage should be the
1529 same, independent of what translation unit asks for the
1530 address, and this will not hold when we emit multiple copies of
1531 the function. However, there's little else we can do.
1533 Also, by default, the typeinfo implementation assumes that
1534 there will be only one copy of the string used as the name for
1535 each type. Therefore, if weak symbols are unavailable, the
1536 run-time library should perform a more conservative check; it
1537 should perform a string comparison, rather than an address
1539 TREE_PUBLIC (decl) = 0;
1542 /* Static data member template instantiations, however, cannot
1543 have multiple copies. */
1544 if (DECL_INITIAL (decl) == 0
1545 || DECL_INITIAL (decl) == error_mark_node)
1546 DECL_COMMON (decl) = 1;
1547 else if (EMPTY_CONSTRUCTOR_P (DECL_INITIAL (decl)))
1549 DECL_COMMON (decl) = 1;
1550 DECL_INITIAL (decl) = error_mark_node;
1552 else if (!DECL_EXPLICIT_INSTANTIATION (decl))
1554 /* We can't do anything useful; leave vars for explicit
1556 DECL_EXTERNAL (decl) = 1;
1557 DECL_NOT_REALLY_EXTERN (decl) = 0;
1561 if (DECL_LANG_SPECIFIC (decl))
1562 DECL_COMDAT (decl) = 1;
1565 /* For win32 we also want to put explicit instantiations in
1566 linkonce sections, so that they will be merged with implicit
1567 instantiations; otherwise we get duplicate symbol errors.
1568 For Darwin we do not want explicit instantiations to be
1572 maybe_make_one_only (tree decl)
1574 /* We used to say that this was not necessary on targets that support weak
1575 symbols, because the implicit instantiations will defer to the explicit
1576 one. However, that's not actually the case in SVR4; a strong definition
1577 after a weak one is an error. Also, not making explicit
1578 instantiations one_only means that we can end up with two copies of
1579 some template instantiations. */
1583 /* We can't set DECL_COMDAT on functions, or cp_finish_file will think
1584 we can get away with not emitting them if they aren't used. We need
1585 to for variables so that cp_finish_decl will update their linkage,
1586 because their DECL_INITIAL may not have been set properly yet. */
1588 if (!TARGET_WEAK_NOT_IN_ARCHIVE_TOC
1589 || (! DECL_EXPLICIT_INSTANTIATION (decl)
1590 && ! DECL_TEMPLATE_SPECIALIZATION (decl)))
1592 make_decl_one_only (decl, cxx_comdat_group (decl));
1594 if (TREE_CODE (decl) == VAR_DECL)
1596 DECL_COMDAT (decl) = 1;
1597 /* Mark it needed so we don't forget to emit it. */
1598 mark_decl_referenced (decl);
1603 /* Determine whether or not we want to specifically import or export CTYPE,
1604 using various heuristics. */
1607 import_export_class (tree ctype)
1609 /* -1 for imported, 1 for exported. */
1610 int import_export = 0;
1612 /* It only makes sense to call this function at EOF. The reason is
1613 that this function looks at whether or not the first non-inline
1614 non-abstract virtual member function has been defined in this
1615 translation unit. But, we can't possibly know that until we've
1616 seen the entire translation unit. */
1617 gcc_assert (at_eof);
1619 if (CLASSTYPE_INTERFACE_KNOWN (ctype))
1622 /* If MULTIPLE_SYMBOL_SPACES is set and we saw a #pragma interface,
1623 we will have CLASSTYPE_INTERFACE_ONLY set but not
1624 CLASSTYPE_INTERFACE_KNOWN. In that case, we don't want to use this
1625 heuristic because someone will supply a #pragma implementation
1626 elsewhere, and deducing it here would produce a conflict. */
1627 if (CLASSTYPE_INTERFACE_ONLY (ctype))
1630 if (lookup_attribute ("dllimport", TYPE_ATTRIBUTES (ctype)))
1632 else if (lookup_attribute ("dllexport", TYPE_ATTRIBUTES (ctype)))
1634 else if (CLASSTYPE_IMPLICIT_INSTANTIATION (ctype)
1635 && !flag_implicit_templates)
1636 /* For a template class, without -fimplicit-templates, check the
1637 repository. If the virtual table is assigned to this
1638 translation unit, then export the class; otherwise, import
1640 import_export = repo_export_class_p (ctype) ? 1 : -1;
1641 else if (TYPE_POLYMORPHIC_P (ctype))
1643 /* The ABI specifies that the virtual table and associated
1644 information are emitted with the key method, if any. */
1645 tree method = CLASSTYPE_KEY_METHOD (ctype);
1646 /* If weak symbol support is not available, then we must be
1647 careful not to emit the vtable when the key function is
1648 inline. An inline function can be defined in multiple
1649 translation units. If we were to emit the vtable in each
1650 translation unit containing a definition, we would get
1651 multiple definition errors at link-time. */
1652 if (method && (flag_weak || ! DECL_DECLARED_INLINE_P (method)))
1653 import_export = (DECL_REALLY_EXTERN (method) ? -1 : 1);
1656 /* When MULTIPLE_SYMBOL_SPACES is set, we cannot count on seeing
1657 a definition anywhere else. */
1658 if (MULTIPLE_SYMBOL_SPACES && import_export == -1)
1661 /* Allow back ends the chance to overrule the decision. */
1662 if (targetm.cxx.import_export_class)
1663 import_export = targetm.cxx.import_export_class (ctype, import_export);
1667 SET_CLASSTYPE_INTERFACE_KNOWN (ctype);
1668 CLASSTYPE_INTERFACE_ONLY (ctype) = (import_export < 0);
1672 /* Return true if VAR has already been provided to the back end; in that
1673 case VAR should not be modified further by the front end. */
1675 var_finalized_p (tree var)
1677 return varpool_node (var)->finalized;
1680 /* DECL is a VAR_DECL or FUNCTION_DECL which, for whatever reason,
1681 must be emitted in this translation unit. Mark it as such. */
1684 mark_needed (tree decl)
1686 /* It's possible that we no longer need to set
1687 TREE_SYMBOL_REFERENCED here directly, but doing so is
1689 TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)) = 1;
1690 mark_decl_referenced (decl);
1693 /* DECL is either a FUNCTION_DECL or a VAR_DECL. This function
1694 returns true if a definition of this entity should be provided in
1695 this object file. Callers use this function to determine whether
1696 or not to let the back end know that a definition of DECL is
1697 available in this translation unit. */
1700 decl_needed_p (tree decl)
1702 gcc_assert (TREE_CODE (decl) == VAR_DECL
1703 || TREE_CODE (decl) == FUNCTION_DECL);
1704 /* This function should only be called at the end of the translation
1705 unit. We cannot be sure of whether or not something will be
1706 COMDAT until that point. */
1707 gcc_assert (at_eof);
1709 /* All entities with external linkage that are not COMDAT should be
1710 emitted; they may be referred to from other object files. */
1711 if (TREE_PUBLIC (decl) && !DECL_COMDAT (decl))
1713 /* If this entity was used, let the back end see it; it will decide
1714 whether or not to emit it into the object file. */
1715 if (TREE_USED (decl)
1716 || (DECL_ASSEMBLER_NAME_SET_P (decl)
1717 && TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))))
1719 /* Functions marked "dllexport" must be emitted so that they are
1720 visible to other DLLs. */
1721 if (lookup_attribute ("dllexport", DECL_ATTRIBUTES (decl)))
1723 /* Otherwise, DECL does not need to be emitted -- yet. A subsequent
1724 reference to DECL might cause it to be emitted later. */
1728 /* If necessary, write out the vtables for the dynamic class CTYPE.
1729 Returns true if any vtables were emitted. */
1732 maybe_emit_vtables (tree ctype)
1738 /* If the vtables for this class have already been emitted there is
1739 nothing more to do. */
1740 primary_vtbl = CLASSTYPE_VTABLES (ctype);
1741 if (var_finalized_p (primary_vtbl))
1743 /* Ignore dummy vtables made by get_vtable_decl. */
1744 if (TREE_TYPE (primary_vtbl) == void_type_node)
1747 /* On some targets, we cannot determine the key method until the end
1748 of the translation unit -- which is when this function is
1750 if (!targetm.cxx.key_method_may_be_inline ())
1751 determine_key_method (ctype);
1753 /* See if any of the vtables are needed. */
1754 for (vtbl = CLASSTYPE_VTABLES (ctype); vtbl; vtbl = TREE_CHAIN (vtbl))
1756 import_export_decl (vtbl);
1757 if (DECL_NOT_REALLY_EXTERN (vtbl) && decl_needed_p (vtbl))
1762 /* If the references to this class' vtables are optimized away,
1763 still emit the appropriate debugging information. See
1765 if (DECL_COMDAT (primary_vtbl)
1766 && CLASSTYPE_DEBUG_REQUESTED (ctype))
1767 note_debug_info_needed (ctype);
1771 /* The ABI requires that we emit all of the vtables if we emit any
1773 for (vtbl = CLASSTYPE_VTABLES (ctype); vtbl; vtbl = TREE_CHAIN (vtbl))
1775 /* Mark entities references from the virtual table as used. */
1776 mark_vtable_entries (vtbl);
1778 if (TREE_TYPE (DECL_INITIAL (vtbl)) == 0)
1780 tree expr = store_init_value (vtbl, DECL_INITIAL (vtbl), LOOKUP_NORMAL);
1782 /* It had better be all done at compile-time. */
1787 DECL_EXTERNAL (vtbl) = 0;
1788 rest_of_decl_compilation (vtbl, 1, 1);
1790 /* Because we're only doing syntax-checking, we'll never end up
1791 actually marking the variable as written. */
1792 if (flag_syntax_only)
1793 TREE_ASM_WRITTEN (vtbl) = 1;
1796 /* Since we're writing out the vtable here, also write the debug
1798 note_debug_info_needed (ctype);
1803 /* A special return value from type_visibility meaning internal
1806 enum { VISIBILITY_ANON = VISIBILITY_INTERNAL+1 };
1808 /* walk_tree helper function for type_visibility. */
1811 min_vis_r (tree *tp, int *walk_subtrees, void *data)
1813 int *vis_p = (int *)data;
1818 else if (CLASS_TYPE_P (*tp))
1820 if (!TREE_PUBLIC (TYPE_MAIN_DECL (*tp)))
1822 *vis_p = VISIBILITY_ANON;
1825 else if (CLASSTYPE_VISIBILITY (*tp) > *vis_p)
1826 *vis_p = CLASSTYPE_VISIBILITY (*tp);
1831 /* Returns the visibility of TYPE, which is the minimum visibility of its
1835 type_visibility (tree type)
1837 int vis = VISIBILITY_DEFAULT;
1838 cp_walk_tree_without_duplicates (&type, min_vis_r, &vis);
1842 /* Limit the visibility of DECL to VISIBILITY, if not explicitly
1843 specified (or if VISIBILITY is static). */
1846 constrain_visibility (tree decl, int visibility)
1848 if (visibility == VISIBILITY_ANON)
1850 /* extern "C" declarations aren't affected by the anonymous
1852 if (!DECL_EXTERN_C_P (decl))
1854 TREE_PUBLIC (decl) = 0;
1855 DECL_COMDAT_GROUP (decl) = NULL_TREE;
1856 DECL_INTERFACE_KNOWN (decl) = 1;
1857 if (DECL_LANG_SPECIFIC (decl))
1858 DECL_NOT_REALLY_EXTERN (decl) = 1;
1861 else if (visibility > DECL_VISIBILITY (decl)
1862 && !DECL_VISIBILITY_SPECIFIED (decl))
1864 DECL_VISIBILITY (decl) = (enum symbol_visibility) visibility;
1870 /* Constrain the visibility of DECL based on the visibility of its template
1874 constrain_visibility_for_template (tree decl, tree targs)
1876 /* If this is a template instantiation, check the innermost
1877 template args for visibility constraints. The outer template
1878 args are covered by the class check. */
1879 tree args = INNERMOST_TEMPLATE_ARGS (targs);
1881 for (i = TREE_VEC_LENGTH (args); i > 0; --i)
1885 tree arg = TREE_VEC_ELT (args, i-1);
1887 vis = type_visibility (arg);
1888 else if (TREE_TYPE (arg) && POINTER_TYPE_P (TREE_TYPE (arg)))
1891 if (TREE_CODE (arg) == ADDR_EXPR)
1892 arg = TREE_OPERAND (arg, 0);
1893 if (TREE_CODE (arg) == VAR_DECL
1894 || TREE_CODE (arg) == FUNCTION_DECL)
1896 if (! TREE_PUBLIC (arg))
1897 vis = VISIBILITY_ANON;
1899 vis = DECL_VISIBILITY (arg);
1903 constrain_visibility (decl, vis);
1907 /* Like c_determine_visibility, but with additional C++-specific
1910 Function-scope entities can rely on the function's visibility because
1911 it is set in start_preparsed_function.
1913 Class-scope entities cannot rely on the class's visibility until the end
1914 of the enclosing class definition.
1916 Note that because namespaces have multiple independent definitions,
1917 namespace visibility is handled elsewhere using the #pragma visibility
1918 machinery rather than by decorating the namespace declaration.
1920 The goal is for constraints from the type to give a diagnostic, and
1921 other constraints to be applied silently. */
1924 determine_visibility (tree decl)
1926 tree class_type = NULL_TREE;
1928 bool orig_visibility_specified;
1929 enum symbol_visibility orig_visibility;
1931 /* Remember that all decls get VISIBILITY_DEFAULT when built. */
1933 /* Only relevant for names with external linkage. */
1934 if (!TREE_PUBLIC (decl))
1937 /* Cloned constructors and destructors get the same visibility as
1938 the underlying function. That should be set up in
1939 maybe_clone_body. */
1940 gcc_assert (!DECL_CLONED_FUNCTION_P (decl));
1942 orig_visibility_specified = DECL_VISIBILITY_SPECIFIED (decl);
1943 orig_visibility = DECL_VISIBILITY (decl);
1945 if (TREE_CODE (decl) == TYPE_DECL)
1947 if (CLASS_TYPE_P (TREE_TYPE (decl)))
1948 use_template = CLASSTYPE_USE_TEMPLATE (TREE_TYPE (decl));
1949 else if (TYPE_TEMPLATE_INFO (TREE_TYPE (decl)))
1954 else if (DECL_LANG_SPECIFIC (decl))
1955 use_template = DECL_USE_TEMPLATE (decl);
1959 /* If DECL is a member of a class, visibility specifiers on the
1960 class can influence the visibility of the DECL. */
1961 if (DECL_CLASS_SCOPE_P (decl))
1962 class_type = DECL_CONTEXT (decl);
1965 /* Not a class member. */
1967 /* Virtual tables have DECL_CONTEXT set to their associated class,
1968 so they are automatically handled above. */
1969 gcc_assert (TREE_CODE (decl) != VAR_DECL
1970 || !DECL_VTABLE_OR_VTT_P (decl));
1972 if (DECL_FUNCTION_SCOPE_P (decl) && ! DECL_VISIBILITY_SPECIFIED (decl))
1974 /* Local statics and classes get the visibility of their
1975 containing function by default, except that
1976 -fvisibility-inlines-hidden doesn't affect them. */
1977 tree fn = DECL_CONTEXT (decl);
1978 if (DECL_VISIBILITY_SPECIFIED (fn) || ! DECL_CLASS_SCOPE_P (fn))
1980 DECL_VISIBILITY (decl) = DECL_VISIBILITY (fn);
1981 DECL_VISIBILITY_SPECIFIED (decl) =
1982 DECL_VISIBILITY_SPECIFIED (fn);
1985 determine_visibility_from_class (decl, DECL_CONTEXT (fn));
1987 /* Local classes in templates have CLASSTYPE_USE_TEMPLATE set,
1988 but have no TEMPLATE_INFO, so don't try to check it. */
1991 else if (TREE_CODE (decl) == VAR_DECL && DECL_TINFO_P (decl)
1992 && flag_visibility_ms_compat)
1994 /* Under -fvisibility-ms-compat, types are visible by default,
1995 even though their contents aren't. */
1996 tree underlying_type = TREE_TYPE (DECL_NAME (decl));
1997 int underlying_vis = type_visibility (underlying_type);
1998 if (underlying_vis == VISIBILITY_ANON
1999 || CLASSTYPE_VISIBILITY_SPECIFIED (underlying_type))
2000 constrain_visibility (decl, underlying_vis);
2002 DECL_VISIBILITY (decl) = VISIBILITY_DEFAULT;
2004 else if (TREE_CODE (decl) == VAR_DECL && DECL_TINFO_P (decl))
2006 /* tinfo visibility is based on the type it's for. */
2007 constrain_visibility
2008 (decl, type_visibility (TREE_TYPE (DECL_NAME (decl))));
2010 /* Give the target a chance to override the visibility associated
2012 if (TREE_PUBLIC (decl)
2013 && !DECL_REALLY_EXTERN (decl)
2014 && CLASS_TYPE_P (TREE_TYPE (DECL_NAME (decl)))
2015 && !CLASSTYPE_VISIBILITY_SPECIFIED (TREE_TYPE (DECL_NAME (decl))))
2016 targetm.cxx.determine_class_data_visibility (decl);
2018 else if (use_template)
2019 /* Template instantiations and specializations get visibility based
2020 on their template unless they override it with an attribute. */;
2021 else if (! DECL_VISIBILITY_SPECIFIED (decl))
2023 /* Set default visibility to whatever the user supplied with
2024 #pragma GCC visibility or a namespace visibility attribute. */
2025 DECL_VISIBILITY (decl) = default_visibility;
2026 DECL_VISIBILITY_SPECIFIED (decl) = visibility_options.inpragma;
2032 /* If the specialization doesn't specify visibility, use the
2033 visibility from the template. */
2034 tree tinfo = (TREE_CODE (decl) == TYPE_DECL
2035 ? TYPE_TEMPLATE_INFO (TREE_TYPE (decl))
2036 : DECL_TEMPLATE_INFO (decl));
2037 tree args = TI_ARGS (tinfo);
2039 if (args != error_mark_node)
2041 int depth = TMPL_ARGS_DEPTH (args);
2042 tree pattern = DECL_TEMPLATE_RESULT (TI_TEMPLATE (tinfo));
2044 if (!DECL_VISIBILITY_SPECIFIED (decl))
2046 DECL_VISIBILITY (decl) = DECL_VISIBILITY (pattern);
2047 DECL_VISIBILITY_SPECIFIED (decl)
2048 = DECL_VISIBILITY_SPECIFIED (pattern);
2051 /* FIXME should TMPL_ARGS_DEPTH really return 1 for null input? */
2052 if (args && depth > template_class_depth (class_type))
2053 /* Limit visibility based on its template arguments. */
2054 constrain_visibility_for_template (decl, args);
2059 determine_visibility_from_class (decl, class_type);
2061 if (decl_anon_ns_mem_p (decl))
2062 /* Names in an anonymous namespace get internal linkage.
2063 This might change once we implement export. */
2064 constrain_visibility (decl, VISIBILITY_ANON);
2065 else if (TREE_CODE (decl) != TYPE_DECL)
2067 /* Propagate anonymity from type to decl. */
2068 int tvis = type_visibility (TREE_TYPE (decl));
2069 if (tvis == VISIBILITY_ANON
2070 || ! DECL_VISIBILITY_SPECIFIED (decl))
2071 constrain_visibility (decl, tvis);
2074 /* If visibility changed and DECL already has DECL_RTL, ensure
2075 symbol flags are updated. */
2076 if ((DECL_VISIBILITY (decl) != orig_visibility
2077 || DECL_VISIBILITY_SPECIFIED (decl) != orig_visibility_specified)
2078 && ((TREE_CODE (decl) == VAR_DECL && TREE_STATIC (decl))
2079 || TREE_CODE (decl) == FUNCTION_DECL)
2080 && DECL_RTL_SET_P (decl))
2081 make_decl_rtl (decl);
2084 /* By default, static data members and function members receive
2085 the visibility of their containing class. */
2088 determine_visibility_from_class (tree decl, tree class_type)
2090 if (DECL_VISIBILITY_SPECIFIED (decl))
2093 if (visibility_options.inlines_hidden
2094 /* Don't do this for inline templates; specializations might not be
2095 inline, and we don't want them to inherit the hidden
2096 visibility. We'll set it here for all inline instantiations. */
2097 && !processing_template_decl
2098 && TREE_CODE (decl) == FUNCTION_DECL
2099 && DECL_DECLARED_INLINE_P (decl)
2100 && (! DECL_LANG_SPECIFIC (decl)
2101 || ! DECL_EXPLICIT_INSTANTIATION (decl)))
2102 DECL_VISIBILITY (decl) = VISIBILITY_HIDDEN;
2105 /* Default to the class visibility. */
2106 DECL_VISIBILITY (decl) = CLASSTYPE_VISIBILITY (class_type);
2107 DECL_VISIBILITY_SPECIFIED (decl)
2108 = CLASSTYPE_VISIBILITY_SPECIFIED (class_type);
2111 /* Give the target a chance to override the visibility associated
2113 if (TREE_CODE (decl) == VAR_DECL
2114 && (DECL_TINFO_P (decl)
2115 || (DECL_VTABLE_OR_VTT_P (decl)
2116 /* Construction virtual tables are not exported because
2117 they cannot be referred to from other object files;
2118 their name is not standardized by the ABI. */
2119 && !DECL_CONSTRUCTION_VTABLE_P (decl)))
2120 && TREE_PUBLIC (decl)
2121 && !DECL_REALLY_EXTERN (decl)
2122 && !CLASSTYPE_VISIBILITY_SPECIFIED (class_type))
2123 targetm.cxx.determine_class_data_visibility (decl);
2126 /* Constrain the visibility of a class TYPE based on the visibility of its
2127 field types. Warn if any fields require lesser visibility. */
2130 constrain_class_visibility (tree type)
2136 int vis = type_visibility (type);
2138 if (vis == VISIBILITY_ANON
2139 || DECL_IN_SYSTEM_HEADER (TYPE_MAIN_DECL (type)))
2142 /* Don't warn about visibility if the class has explicit visibility. */
2143 if (CLASSTYPE_VISIBILITY_SPECIFIED (type))
2144 vis = VISIBILITY_INTERNAL;
2146 for (t = TYPE_FIELDS (type); t; t = TREE_CHAIN (t))
2147 if (TREE_CODE (t) == FIELD_DECL && TREE_TYPE (t) != error_mark_node)
2149 tree ftype = strip_pointer_or_array_types (TREE_TYPE (t));
2150 int subvis = type_visibility (ftype);
2152 if (subvis == VISIBILITY_ANON)
2154 if (!in_main_input_context ())
2156 %qT has a field %qD whose type uses the anonymous namespace",
2159 else if (MAYBE_CLASS_TYPE_P (ftype)
2160 && vis < VISIBILITY_HIDDEN
2161 && subvis >= VISIBILITY_HIDDEN)
2162 warning (OPT_Wattributes, "\
2163 %qT declared with greater visibility than the type of its field %qD",
2167 binfo = TYPE_BINFO (type);
2168 for (i = 0; BINFO_BASE_ITERATE (binfo, i, t); ++i)
2170 int subvis = type_visibility (TREE_TYPE (t));
2172 if (subvis == VISIBILITY_ANON)
2174 if (!in_main_input_context())
2176 %qT has a base %qT whose type uses the anonymous namespace",
2177 type, TREE_TYPE (t));
2179 else if (vis < VISIBILITY_HIDDEN
2180 && subvis >= VISIBILITY_HIDDEN)
2181 warning (OPT_Wattributes, "\
2182 %qT declared with greater visibility than its base %qT",
2183 type, TREE_TYPE (t));
2187 /* DECL is a FUNCTION_DECL or VAR_DECL. If the object file linkage
2188 for DECL has not already been determined, do so now by setting
2189 DECL_EXTERNAL, DECL_COMDAT and other related flags. Until this
2190 function is called entities with vague linkage whose definitions
2191 are available must have TREE_PUBLIC set.
2193 If this function decides to place DECL in COMDAT, it will set
2194 appropriate flags -- but will not clear DECL_EXTERNAL. It is up to
2195 the caller to decide whether or not to clear DECL_EXTERNAL. Some
2196 callers defer that decision until it is clear that DECL is actually
2200 import_export_decl (tree decl)
2205 tree class_type = NULL_TREE;
2207 if (DECL_INTERFACE_KNOWN (decl))
2210 /* We cannot determine what linkage to give to an entity with vague
2211 linkage until the end of the file. For example, a virtual table
2212 for a class will be defined if and only if the key method is
2213 defined in this translation unit. As a further example, consider
2214 that when compiling a translation unit that uses PCH file with
2215 "-frepo" it would be incorrect to make decisions about what
2216 entities to emit when building the PCH; those decisions must be
2217 delayed until the repository information has been processed. */
2218 gcc_assert (at_eof);
2219 /* Object file linkage for explicit instantiations is handled in
2220 mark_decl_instantiated. For static variables in functions with
2221 vague linkage, maybe_commonize_var is used.
2223 Therefore, the only declarations that should be provided to this
2224 function are those with external linkage that are:
2226 * implicit instantiations of function templates
2230 * implicit instantiations of static data members of class
2237 Furthermore, all entities that reach this point must have a
2238 definition available in this translation unit.
2240 The following assertions check these conditions. */
2241 gcc_assert (TREE_CODE (decl) == FUNCTION_DECL
2242 || TREE_CODE (decl) == VAR_DECL);
2243 /* Any code that creates entities with TREE_PUBLIC cleared should
2244 also set DECL_INTERFACE_KNOWN. */
2245 gcc_assert (TREE_PUBLIC (decl));
2246 if (TREE_CODE (decl) == FUNCTION_DECL)
2247 gcc_assert (DECL_IMPLICIT_INSTANTIATION (decl)
2248 || DECL_FRIEND_PSEUDO_TEMPLATE_INSTANTIATION (decl)
2249 || DECL_DECLARED_INLINE_P (decl));
2251 gcc_assert (DECL_IMPLICIT_INSTANTIATION (decl)
2252 || DECL_VTABLE_OR_VTT_P (decl)
2253 || DECL_TINFO_P (decl));
2254 /* Check that a definition of DECL is available in this translation
2256 gcc_assert (!DECL_REALLY_EXTERN (decl));
2258 /* Assume that DECL will not have COMDAT linkage. */
2260 /* Assume that DECL will not be imported into this translation
2264 /* See if the repository tells us whether or not to emit DECL in
2265 this translation unit. */
2266 emit_p = repo_emit_p (decl);
2269 else if (emit_p == 1)
2271 /* The repository indicates that this entity should be defined
2272 here. Make sure the back end honors that request. */
2273 if (TREE_CODE (decl) == VAR_DECL)
2275 else if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (decl)
2276 || DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P (decl))
2279 FOR_EACH_CLONE (clone, decl)
2280 mark_needed (clone);
2284 /* Output the definition as an ordinary strong definition. */
2285 DECL_EXTERNAL (decl) = 0;
2286 DECL_INTERFACE_KNOWN (decl) = 1;
2291 /* We have already decided what to do with this DECL; there is no
2292 need to check anything further. */
2294 else if (TREE_CODE (decl) == VAR_DECL && DECL_VTABLE_OR_VTT_P (decl))
2296 class_type = DECL_CONTEXT (decl);
2297 import_export_class (class_type);
2298 if (TYPE_FOR_JAVA (class_type))
2300 else if (CLASSTYPE_INTERFACE_KNOWN (class_type)
2301 && CLASSTYPE_INTERFACE_ONLY (class_type))
2303 else if ((!flag_weak || TARGET_WEAK_NOT_IN_ARCHIVE_TOC)
2304 && !CLASSTYPE_USE_TEMPLATE (class_type)
2305 && CLASSTYPE_KEY_METHOD (class_type)
2306 && !DECL_DECLARED_INLINE_P (CLASSTYPE_KEY_METHOD (class_type)))
2307 /* The ABI requires that all virtual tables be emitted with
2308 COMDAT linkage. However, on systems where COMDAT symbols
2309 don't show up in the table of contents for a static
2310 archive, or on systems without weak symbols (where we
2311 approximate COMDAT linkage by using internal linkage), the
2312 linker will report errors about undefined symbols because
2313 it will not see the virtual table definition. Therefore,
2314 in the case that we know that the virtual table will be
2315 emitted in only one translation unit, we make the virtual
2316 table an ordinary definition with external linkage. */
2317 DECL_EXTERNAL (decl) = 0;
2318 else if (CLASSTYPE_INTERFACE_KNOWN (class_type))
2320 /* CLASS_TYPE is being exported from this translation unit,
2321 so DECL should be defined here. */
2322 if (!flag_weak && CLASSTYPE_EXPLICIT_INSTANTIATION (class_type))
2323 /* If a class is declared in a header with the "extern
2324 template" extension, then it will not be instantiated,
2325 even in translation units that would normally require
2326 it. Often such classes are explicitly instantiated in
2327 one translation unit. Therefore, the explicit
2328 instantiation must be made visible to other translation
2330 DECL_EXTERNAL (decl) = 0;
2333 /* The generic C++ ABI says that class data is always
2334 COMDAT, even if there is a key function. Some
2335 variants (e.g., the ARM EABI) says that class data
2336 only has COMDAT linkage if the class data might be
2337 emitted in more than one translation unit. When the
2338 key method can be inline and is inline, we still have
2339 to arrange for comdat even though
2340 class_data_always_comdat is false. */
2341 if (!CLASSTYPE_KEY_METHOD (class_type)
2342 || DECL_DECLARED_INLINE_P (CLASSTYPE_KEY_METHOD (class_type))
2343 || targetm.cxx.class_data_always_comdat ())
2345 /* The ABI requires COMDAT linkage. Normally, we
2346 only emit COMDAT things when they are needed;
2347 make sure that we realize that this entity is
2354 else if (!flag_implicit_templates
2355 && CLASSTYPE_IMPLICIT_INSTANTIATION (class_type))
2360 else if (TREE_CODE (decl) == VAR_DECL && DECL_TINFO_P (decl))
2362 tree type = TREE_TYPE (DECL_NAME (decl));
2363 if (CLASS_TYPE_P (type))
2366 import_export_class (type);
2367 if (CLASSTYPE_INTERFACE_KNOWN (type)
2368 && TYPE_POLYMORPHIC_P (type)
2369 && CLASSTYPE_INTERFACE_ONLY (type)
2370 /* If -fno-rtti was specified, then we cannot be sure
2371 that RTTI information will be emitted with the
2372 virtual table of the class, so we must emit it
2373 wherever it is used. */
2378 if (CLASSTYPE_INTERFACE_KNOWN (type)
2379 && !CLASSTYPE_INTERFACE_ONLY (type))
2381 comdat_p = (targetm.cxx.class_data_always_comdat ()
2382 || (CLASSTYPE_KEY_METHOD (type)
2383 && DECL_DECLARED_INLINE_P (CLASSTYPE_KEY_METHOD (type))));
2388 DECL_EXTERNAL (decl) = 0;
2398 else if (DECL_TEMPLATE_INSTANTIATION (decl)
2399 || DECL_FRIEND_PSEUDO_TEMPLATE_INSTANTIATION (decl))
2401 /* DECL is an implicit instantiation of a function or static
2403 if ((flag_implicit_templates
2404 && !flag_use_repository)
2405 || (flag_implicit_inline_templates
2406 && TREE_CODE (decl) == FUNCTION_DECL
2407 && DECL_DECLARED_INLINE_P (decl)))
2410 /* If we are not implicitly generating templates, then mark
2411 this entity as undefined in this translation unit. */
2414 else if (DECL_FUNCTION_MEMBER_P (decl))
2416 if (!DECL_DECLARED_INLINE_P (decl))
2418 tree ctype = DECL_CONTEXT (decl);
2419 import_export_class (ctype);
2420 if (CLASSTYPE_INTERFACE_KNOWN (ctype))
2422 DECL_NOT_REALLY_EXTERN (decl)
2423 = ! (CLASSTYPE_INTERFACE_ONLY (ctype)
2424 || (DECL_DECLARED_INLINE_P (decl)
2425 && ! flag_implement_inlines
2426 && !DECL_VINDEX (decl)));
2428 if (!DECL_NOT_REALLY_EXTERN (decl))
2429 DECL_EXTERNAL (decl) = 1;
2431 /* Always make artificials weak. */
2432 if (DECL_ARTIFICIAL (decl) && flag_weak)
2435 maybe_make_one_only (decl);
2446 /* If we are importing DECL into this translation unit, mark is
2447 an undefined here. */
2448 DECL_EXTERNAL (decl) = 1;
2449 DECL_NOT_REALLY_EXTERN (decl) = 0;
2453 /* If we decided to put DECL in COMDAT, mark it accordingly at
2455 comdat_linkage (decl);
2458 DECL_INTERFACE_KNOWN (decl) = 1;
2461 /* Return an expression that performs the destruction of DECL, which
2462 must be a VAR_DECL whose type has a non-trivial destructor, or is
2463 an array whose (innermost) elements have a non-trivial destructor. */
2466 build_cleanup (tree decl)
2469 tree type = TREE_TYPE (decl);
2471 /* This function should only be called for declarations that really
2472 require cleanups. */
2473 gcc_assert (!TYPE_HAS_TRIVIAL_DESTRUCTOR (type));
2475 /* Treat all objects with destructors as used; the destructor may do
2476 something substantive. */
2479 if (TREE_CODE (type) == ARRAY_TYPE)
2482 temp = build_address (decl);
2483 temp = build_delete (TREE_TYPE (temp), temp,
2484 sfk_complete_destructor,
2485 LOOKUP_NORMAL|LOOKUP_NONVIRTUAL|LOOKUP_DESTRUCTOR, 0);
2489 /* Returns the initialization guard variable for the variable DECL,
2490 which has static storage duration. */
2493 get_guard (tree decl)
2498 sname = mangle_guard_variable (decl);
2499 guard = IDENTIFIER_GLOBAL_VALUE (sname);
2504 /* We use a type that is big enough to contain a mutex as well
2505 as an integer counter. */
2506 guard_type = targetm.cxx.guard_type ();
2507 guard = build_decl (DECL_SOURCE_LOCATION (decl),
2508 VAR_DECL, sname, guard_type);
2510 /* The guard should have the same linkage as what it guards. */
2511 TREE_PUBLIC (guard) = TREE_PUBLIC (decl);
2512 TREE_STATIC (guard) = TREE_STATIC (decl);
2513 DECL_COMMON (guard) = DECL_COMMON (decl);
2514 DECL_COMDAT_GROUP (guard) = DECL_COMDAT_GROUP (decl);
2515 if (TREE_PUBLIC (decl))
2516 DECL_WEAK (guard) = DECL_WEAK (decl);
2517 DECL_VISIBILITY (guard) = DECL_VISIBILITY (decl);
2518 DECL_VISIBILITY_SPECIFIED (guard) = DECL_VISIBILITY_SPECIFIED (decl);
2520 DECL_ARTIFICIAL (guard) = 1;
2521 DECL_IGNORED_P (guard) = 1;
2522 TREE_USED (guard) = 1;
2523 pushdecl_top_level_and_finish (guard, NULL_TREE);
2528 /* Return those bits of the GUARD variable that should be set when the
2529 guarded entity is actually initialized. */
2532 get_guard_bits (tree guard)
2534 if (!targetm.cxx.guard_mask_bit ())
2536 /* We only set the first byte of the guard, in order to leave room
2537 for a mutex in the high-order bits. */
2538 guard = build1 (ADDR_EXPR,
2539 build_pointer_type (TREE_TYPE (guard)),
2541 guard = build1 (NOP_EXPR,
2542 build_pointer_type (char_type_node),
2544 guard = build1 (INDIRECT_REF, char_type_node, guard);
2550 /* Return an expression which determines whether or not the GUARD
2551 variable has already been initialized. */
2554 get_guard_cond (tree guard)
2558 /* Check to see if the GUARD is zero. */
2559 guard = get_guard_bits (guard);
2561 /* Mask off all but the low bit. */
2562 if (targetm.cxx.guard_mask_bit ())
2564 guard_value = integer_one_node;
2565 if (!same_type_p (TREE_TYPE (guard_value), TREE_TYPE (guard)))
2566 guard_value = convert (TREE_TYPE (guard), guard_value);
2567 guard = cp_build_binary_op (input_location,
2568 BIT_AND_EXPR, guard, guard_value,
2569 tf_warning_or_error);
2572 guard_value = integer_zero_node;
2573 if (!same_type_p (TREE_TYPE (guard_value), TREE_TYPE (guard)))
2574 guard_value = convert (TREE_TYPE (guard), guard_value);
2575 return cp_build_binary_op (input_location,
2576 EQ_EXPR, guard, guard_value,
2577 tf_warning_or_error);
2580 /* Return an expression which sets the GUARD variable, indicating that
2581 the variable being guarded has been initialized. */
2584 set_guard (tree guard)
2588 /* Set the GUARD to one. */
2589 guard = get_guard_bits (guard);
2590 guard_init = integer_one_node;
2591 if (!same_type_p (TREE_TYPE (guard_init), TREE_TYPE (guard)))
2592 guard_init = convert (TREE_TYPE (guard), guard_init);
2593 return cp_build_modify_expr (guard, NOP_EXPR, guard_init,
2594 tf_warning_or_error);
2597 /* Start the process of running a particular set of global constructors
2598 or destructors. Subroutine of do_[cd]tors. */
2601 start_objects (int method_type, int initp)
2607 /* Make ctor or dtor function. METHOD_TYPE may be 'I' or 'D'. */
2609 if (initp != DEFAULT_INIT_PRIORITY)
2619 sprintf (type, "%c%c%.5u", method_type, joiner, initp);
2622 sprintf (type, "%c", method_type);
2624 fndecl = build_lang_decl (FUNCTION_DECL,
2625 get_file_function_name (type),
2626 build_function_type (void_type_node,
2628 start_preparsed_function (fndecl, /*attrs=*/NULL_TREE, SF_PRE_PARSED);
2630 TREE_PUBLIC (current_function_decl) = 0;
2632 /* Mark as artificial because it's not explicitly in the user's
2634 DECL_ARTIFICIAL (current_function_decl) = 1;
2636 /* Mark this declaration as used to avoid spurious warnings. */
2637 TREE_USED (current_function_decl) = 1;
2639 /* Mark this function as a global constructor or destructor. */
2640 if (method_type == 'I')
2641 DECL_GLOBAL_CTOR_P (current_function_decl) = 1;
2643 DECL_GLOBAL_DTOR_P (current_function_decl) = 1;
2645 body = begin_compound_stmt (BCS_FN_BODY);
2650 /* Finish the process of running a particular set of global constructors
2651 or destructors. Subroutine of do_[cd]tors. */
2654 finish_objects (int method_type, int initp, tree body)
2659 finish_compound_stmt (body);
2660 fn = finish_function (0);
2662 if (method_type == 'I')
2664 DECL_STATIC_CONSTRUCTOR (fn) = 1;
2665 decl_init_priority_insert (fn, initp);
2669 DECL_STATIC_DESTRUCTOR (fn) = 1;
2670 decl_fini_priority_insert (fn, initp);
2673 expand_or_defer_fn (fn);
2676 /* The names of the parameters to the function created to handle
2677 initializations and destructions for objects with static storage
2679 #define INITIALIZE_P_IDENTIFIER "__initialize_p"
2680 #define PRIORITY_IDENTIFIER "__priority"
2682 /* The name of the function we create to handle initializations and
2683 destructions for objects with static storage duration. */
2684 #define SSDF_IDENTIFIER "__static_initialization_and_destruction"
2686 /* The declaration for the __INITIALIZE_P argument. */
2687 static GTY(()) tree initialize_p_decl;
2689 /* The declaration for the __PRIORITY argument. */
2690 static GTY(()) tree priority_decl;
2692 /* The declaration for the static storage duration function. */
2693 static GTY(()) tree ssdf_decl;
2695 /* All the static storage duration functions created in this
2696 translation unit. */
2697 static GTY(()) VEC(tree,gc) *ssdf_decls;
2699 /* A map from priority levels to information about that priority
2700 level. There may be many such levels, so efficient lookup is
2702 static splay_tree priority_info_map;
2704 /* Begins the generation of the function that will handle all
2705 initialization and destruction of objects with static storage
2706 duration. The function generated takes two parameters of type
2707 `int': __INITIALIZE_P and __PRIORITY. If __INITIALIZE_P is
2708 nonzero, it performs initializations. Otherwise, it performs
2709 destructions. It only performs those initializations or
2710 destructions with the indicated __PRIORITY. The generated function
2713 It is assumed that this function will only be called once per
2714 translation unit. */
2717 start_static_storage_duration_function (unsigned count)
2722 char id[sizeof (SSDF_IDENTIFIER) + 1 /* '\0' */ + 32];
2724 /* Create the identifier for this function. It will be of the form
2725 SSDF_IDENTIFIER_<number>. */
2726 sprintf (id, "%s_%u", SSDF_IDENTIFIER, count);
2728 /* Create the parameters. */
2729 parm_types = void_list_node;
2730 parm_types = tree_cons (NULL_TREE, integer_type_node, parm_types);
2731 parm_types = tree_cons (NULL_TREE, integer_type_node, parm_types);
2732 type = build_function_type (void_type_node, parm_types);
2734 /* Create the FUNCTION_DECL itself. */
2735 ssdf_decl = build_lang_decl (FUNCTION_DECL,
2736 get_identifier (id),
2738 TREE_PUBLIC (ssdf_decl) = 0;
2739 DECL_ARTIFICIAL (ssdf_decl) = 1;
2741 /* Put this function in the list of functions to be called from the
2742 static constructors and destructors. */
2745 ssdf_decls = VEC_alloc (tree, gc, 32);
2747 /* Take this opportunity to initialize the map from priority
2748 numbers to information about that priority level. */
2749 priority_info_map = splay_tree_new (splay_tree_compare_ints,
2750 /*delete_key_fn=*/0,
2751 /*delete_value_fn=*/
2752 (splay_tree_delete_value_fn) &free);
2754 /* We always need to generate functions for the
2755 DEFAULT_INIT_PRIORITY so enter it now. That way when we walk
2756 priorities later, we'll be sure to find the
2757 DEFAULT_INIT_PRIORITY. */
2758 get_priority_info (DEFAULT_INIT_PRIORITY);
2761 VEC_safe_push (tree, gc, ssdf_decls, ssdf_decl);
2763 /* Create the argument list. */
2764 initialize_p_decl = cp_build_parm_decl
2765 (get_identifier (INITIALIZE_P_IDENTIFIER), integer_type_node);
2766 DECL_CONTEXT (initialize_p_decl) = ssdf_decl;
2767 TREE_USED (initialize_p_decl) = 1;
2768 priority_decl = cp_build_parm_decl
2769 (get_identifier (PRIORITY_IDENTIFIER), integer_type_node);
2770 DECL_CONTEXT (priority_decl) = ssdf_decl;
2771 TREE_USED (priority_decl) = 1;
2773 TREE_CHAIN (initialize_p_decl) = priority_decl;
2774 DECL_ARGUMENTS (ssdf_decl) = initialize_p_decl;
2776 /* Put the function in the global scope. */
2777 pushdecl (ssdf_decl);
2779 /* Start the function itself. This is equivalent to declaring the
2782 static void __ssdf (int __initialize_p, init __priority_p);
2784 It is static because we only need to call this function from the
2785 various constructor and destructor functions for this module. */
2786 start_preparsed_function (ssdf_decl,
2787 /*attrs=*/NULL_TREE,
2790 /* Set up the scope of the outermost block in the function. */
2791 body = begin_compound_stmt (BCS_FN_BODY);
2796 /* Finish the generation of the function which performs initialization
2797 and destruction of objects with static storage duration. After
2798 this point, no more such objects can be created. */
2801 finish_static_storage_duration_function (tree body)
2803 /* Close out the function. */
2804 finish_compound_stmt (body);
2805 expand_or_defer_fn (finish_function (0));
2808 /* Return the information about the indicated PRIORITY level. If no
2809 code to handle this level has yet been generated, generate the
2810 appropriate prologue. */
2812 static priority_info
2813 get_priority_info (int priority)
2818 n = splay_tree_lookup (priority_info_map,
2819 (splay_tree_key) priority);
2822 /* Create a new priority information structure, and insert it
2824 pi = XNEW (struct priority_info_s);
2825 pi->initializations_p = 0;
2826 pi->destructions_p = 0;
2827 splay_tree_insert (priority_info_map,
2828 (splay_tree_key) priority,
2829 (splay_tree_value) pi);
2832 pi = (priority_info) n->value;
2837 /* The effective initialization priority of a DECL. */
2839 #define DECL_EFFECTIVE_INIT_PRIORITY(decl) \
2840 ((!DECL_HAS_INIT_PRIORITY_P (decl) || DECL_INIT_PRIORITY (decl) == 0) \
2841 ? DEFAULT_INIT_PRIORITY : DECL_INIT_PRIORITY (decl))
2843 /* Whether a DECL needs a guard to protect it against multiple
2846 #define NEEDS_GUARD_P(decl) (TREE_PUBLIC (decl) && (DECL_COMMON (decl) \
2847 || DECL_ONE_ONLY (decl) \
2848 || DECL_WEAK (decl)))
2850 /* Called from one_static_initialization_or_destruction(),
2852 Walks the initializer list of a global variable and looks for
2853 temporary variables (DECL_NAME() == NULL and DECL_ARTIFICIAL != 0)
2854 and that have their DECL_CONTEXT() == NULL.
2855 For each such temporary variable, set their DECL_CONTEXT() to
2856 the current function. This is necessary because otherwise
2857 some optimizers (enabled by -O2 -fprofile-arcs) might crash
2858 when trying to refer to a temporary variable that does not have
2859 it's DECL_CONTECT() properly set. */
2861 fix_temporary_vars_context_r (tree *node,
2862 int *unused ATTRIBUTE_UNUSED,
2863 void *unused1 ATTRIBUTE_UNUSED)
2865 gcc_assert (current_function_decl);
2867 if (TREE_CODE (*node) == BIND_EXPR)
2871 for (var = BIND_EXPR_VARS (*node); var; var = TREE_CHAIN (var))
2872 if (TREE_CODE (var) == VAR_DECL
2874 && DECL_ARTIFICIAL (var)
2875 && !DECL_CONTEXT (var))
2876 DECL_CONTEXT (var) = current_function_decl;
2882 /* Set up to handle the initialization or destruction of DECL. If
2883 INITP is nonzero, we are initializing the variable. Otherwise, we
2884 are destroying it. */
2887 one_static_initialization_or_destruction (tree decl, tree init, bool initp)
2889 tree guard_if_stmt = NULL_TREE;
2892 /* If we are supposed to destruct and there's a trivial destructor,
2893 nothing has to be done. */
2895 && TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
2898 /* Trick the compiler into thinking we are at the file and line
2899 where DECL was declared so that error-messages make sense, and so
2900 that the debugger will show somewhat sensible file and line
2902 input_location = DECL_SOURCE_LOCATION (decl);
2904 /* Make sure temporary variables in the initialiser all have
2905 their DECL_CONTEXT() set to a value different from NULL_TREE.
2906 This can happen when global variables initialisers are built.
2907 In that case, the DECL_CONTEXT() of the global variables _AND_ of all
2908 the temporary variables that might have been generated in the
2909 accompagning initialisers is NULL_TREE, meaning the variables have been
2910 declared in the global namespace.
2911 What we want to do here is to fix that and make sure the DECL_CONTEXT()
2912 of the temporaries are set to the current function decl. */
2913 cp_walk_tree_without_duplicates (&init,
2914 fix_temporary_vars_context_r,
2921 Access control for implicit calls to the constructors,
2922 the conversion functions, or the destructor called to
2923 create and destroy a static data member is performed as
2924 if these calls appeared in the scope of the member's
2927 we pretend we are in a static member function of the class of
2928 which the DECL is a member. */
2929 if (member_p (decl))
2931 DECL_CONTEXT (current_function_decl) = DECL_CONTEXT (decl);
2932 DECL_STATIC_FUNCTION_P (current_function_decl) = 1;
2935 /* Assume we don't need a guard. */
2937 /* We need a guard if this is an object with external linkage that
2938 might be initialized in more than one place. (For example, a
2939 static data member of a template, when the data member requires
2941 if (NEEDS_GUARD_P (decl))
2945 guard = get_guard (decl);
2947 /* When using __cxa_atexit, we just check the GUARD as we would
2948 for a local static. */
2949 if (flag_use_cxa_atexit)
2951 /* When using __cxa_atexit, we never try to destroy
2952 anything from a static destructor. */
2954 guard_cond = get_guard_cond (guard);
2956 /* If we don't have __cxa_atexit, then we will be running
2957 destructors from .fini sections, or their equivalents. So,
2958 we need to know how many times we've tried to initialize this
2959 object. We do initializations only if the GUARD is zero,
2960 i.e., if we are the first to initialize the variable. We do
2961 destructions only if the GUARD is one, i.e., if we are the
2962 last to destroy the variable. */
2965 = cp_build_binary_op (input_location,
2967 cp_build_unary_op (PREINCREMENT_EXPR,
2970 tf_warning_or_error),
2972 tf_warning_or_error);
2975 = cp_build_binary_op (input_location,
2977 cp_build_unary_op (PREDECREMENT_EXPR,
2980 tf_warning_or_error),
2982 tf_warning_or_error);
2984 guard_if_stmt = begin_if_stmt ();
2985 finish_if_stmt_cond (guard_cond, guard_if_stmt);
2989 /* If we're using __cxa_atexit, we have not already set the GUARD,
2990 so we must do so now. */
2991 if (guard && initp && flag_use_cxa_atexit)
2992 finish_expr_stmt (set_guard (guard));
2994 /* Perform the initialization or destruction. */
2998 finish_expr_stmt (init);
3000 /* If we're using __cxa_atexit, register a function that calls the
3001 destructor for the object. */
3002 if (flag_use_cxa_atexit)
3003 finish_expr_stmt (register_dtor_fn (decl));
3006 finish_expr_stmt (build_cleanup (decl));
3008 /* Finish the guard if-stmt, if necessary. */
3011 finish_then_clause (guard_if_stmt);
3012 finish_if_stmt (guard_if_stmt);
3015 /* Now that we're done with DECL we don't need to pretend to be a
3016 member of its class any longer. */
3017 DECL_CONTEXT (current_function_decl) = NULL_TREE;
3018 DECL_STATIC_FUNCTION_P (current_function_decl) = 0;
3021 /* Generate code to do the initialization or destruction of the decls in VARS,
3022 a TREE_LIST of VAR_DECL with static storage duration.
3023 Whether initialization or destruction is performed is specified by INITP. */
3026 do_static_initialization_or_destruction (tree vars, bool initp)
3028 tree node, init_if_stmt, cond;
3030 /* Build the outer if-stmt to check for initialization or destruction. */
3031 init_if_stmt = begin_if_stmt ();
3032 cond = initp ? integer_one_node : integer_zero_node;
3033 cond = cp_build_binary_op (input_location,
3037 tf_warning_or_error);
3038 finish_if_stmt_cond (cond, init_if_stmt);
3042 tree decl = TREE_VALUE (node);
3043 tree priority_if_stmt;
3047 /* If we don't need a destructor, there's nothing to do. Avoid
3048 creating a possibly empty if-stmt. */
3049 if (!initp && TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
3051 node = TREE_CHAIN (node);
3055 /* Remember that we had an initialization or finalization at this
3057 priority = DECL_EFFECTIVE_INIT_PRIORITY (decl);
3058 pi = get_priority_info (priority);
3060 pi->initializations_p = 1;
3062 pi->destructions_p = 1;
3064 /* Conditionalize this initialization on being in the right priority
3065 and being initializing/finalizing appropriately. */
3066 priority_if_stmt = begin_if_stmt ();
3067 cond = cp_build_binary_op (input_location,
3070 build_int_cst (NULL_TREE, priority),
3071 tf_warning_or_error);
3072 finish_if_stmt_cond (cond, priority_if_stmt);
3074 /* Process initializers with same priority. */
3076 && DECL_EFFECTIVE_INIT_PRIORITY (TREE_VALUE (node)) == priority;
3077 node = TREE_CHAIN (node))
3078 /* Do one initialization or destruction. */
3079 one_static_initialization_or_destruction (TREE_VALUE (node),
3080 TREE_PURPOSE (node), initp);
3082 /* Finish up the priority if-stmt body. */
3083 finish_then_clause (priority_if_stmt);
3084 finish_if_stmt (priority_if_stmt);
3088 /* Finish up the init/destruct if-stmt body. */
3089 finish_then_clause (init_if_stmt);
3090 finish_if_stmt (init_if_stmt);
3093 /* VARS is a list of variables with static storage duration which may
3094 need initialization and/or finalization. Remove those variables
3095 that don't really need to be initialized or finalized, and return
3096 the resulting list. The order in which the variables appear in
3097 VARS is in reverse order of the order in which they should actually
3098 be initialized. The list we return is in the unreversed order;
3099 i.e., the first variable should be initialized first. */
3102 prune_vars_needing_no_initialization (tree *vars)
3105 tree result = NULL_TREE;
3110 tree decl = TREE_VALUE (t);
3111 tree init = TREE_PURPOSE (t);
3113 /* Deal gracefully with error. */
3114 if (decl == error_mark_node)
3116 var = &TREE_CHAIN (t);
3120 /* The only things that can be initialized are variables. */
3121 gcc_assert (TREE_CODE (decl) == VAR_DECL);
3123 /* If this object is not defined, we don't need to do anything
3125 if (DECL_EXTERNAL (decl))
3127 var = &TREE_CHAIN (t);
3131 /* Also, if the initializer already contains errors, we can bail
3133 if (init && TREE_CODE (init) == TREE_LIST
3134 && value_member (error_mark_node, init))
3136 var = &TREE_CHAIN (t);
3140 /* This variable is going to need initialization and/or
3141 finalization, so we add it to the list. */
3142 *var = TREE_CHAIN (t);
3143 TREE_CHAIN (t) = result;
3150 /* Make sure we have told the back end about all the variables in
3154 write_out_vars (tree vars)
3158 for (v = vars; v; v = TREE_CHAIN (v))
3160 tree var = TREE_VALUE (v);
3161 if (!var_finalized_p (var))
3163 import_export_decl (var);
3164 rest_of_decl_compilation (var, 1, 1);
3169 /* Generate a static constructor (if CONSTRUCTOR_P) or destructor
3170 (otherwise) that will initialize all global objects with static
3171 storage duration having the indicated PRIORITY. */
3174 generate_ctor_or_dtor_function (bool constructor_p, int priority,
3183 input_location = *locus;
3185 /* Was: locus->line++; */
3187 /* We use `I' to indicate initialization and `D' to indicate
3189 function_key = constructor_p ? 'I' : 'D';
3191 /* We emit the function lazily, to avoid generating empty
3192 global constructors and destructors. */
3195 /* For Objective-C++, we may need to initialize metadata found in this module.
3196 This must be done _before_ any other static initializations. */
3197 if (c_dialect_objc () && (priority == DEFAULT_INIT_PRIORITY)
3198 && constructor_p && objc_static_init_needed_p ())
3200 body = start_objects (function_key, priority);
3201 objc_generate_static_init_call (NULL_TREE);
3204 /* Call the static storage duration function with appropriate
3206 for (i = 0; VEC_iterate (tree, ssdf_decls, i, fndecl); ++i)
3208 /* Calls to pure or const functions will expand to nothing. */
3209 if (! (flags_from_decl_or_type (fndecl) & (ECF_CONST | ECF_PURE)))
3212 body = start_objects (function_key, priority);
3214 arguments = tree_cons (NULL_TREE,
3215 build_int_cst (NULL_TREE, priority),
3217 arguments = tree_cons (NULL_TREE,
3218 build_int_cst (NULL_TREE, constructor_p),
3220 finish_expr_stmt (cp_build_function_call (fndecl, arguments,
3221 tf_warning_or_error));
3225 /* Close out the function. */
3227 finish_objects (function_key, priority, body);
3230 /* Generate constructor and destructor functions for the priority
3234 generate_ctor_and_dtor_functions_for_priority (splay_tree_node n, void * data)
3236 location_t *locus = (location_t *) data;
3237 int priority = (int) n->key;
3238 priority_info pi = (priority_info) n->value;
3240 /* Generate the functions themselves, but only if they are really
3242 if (pi->initializations_p)
3243 generate_ctor_or_dtor_function (/*constructor_p=*/true, priority, locus);
3244 if (pi->destructions_p)
3245 generate_ctor_or_dtor_function (/*constructor_p=*/false, priority, locus);
3247 /* Keep iterating. */
3251 /* Called via LANGHOOK_CALLGRAPH_ANALYZE_EXPR. It is supposed to mark
3252 decls referenced from front-end specific constructs; it will be called
3253 only for language-specific tree nodes.
3255 Here we must deal with member pointers. */
3258 cxx_callgraph_analyze_expr (tree *tp, int *walk_subtrees ATTRIBUTE_UNUSED)
3262 switch (TREE_CODE (t))
3265 if (TYPE_PTRMEMFUNC_P (TREE_TYPE (t)))
3266 cgraph_mark_address_taken_node (cgraph_node (PTRMEM_CST_MEMBER (t)));
3269 if (TREE_CODE (BASELINK_FUNCTIONS (t)) == FUNCTION_DECL)
3270 cgraph_mark_address_taken_node (cgraph_node (BASELINK_FUNCTIONS (t)));
3273 if (DECL_VTABLE_OR_VTT_P (t))
3275 /* The ABI requires that all virtual tables be emitted
3276 whenever one of them is. */
3278 for (vtbl = CLASSTYPE_VTABLES (DECL_CONTEXT (t));
3280 vtbl = TREE_CHAIN (vtbl))
3281 mark_decl_referenced (vtbl);
3283 else if (DECL_CONTEXT (t)
3284 && TREE_CODE (DECL_CONTEXT (t)) == FUNCTION_DECL)
3285 /* If we need a static variable in a function, then we
3286 need the containing function. */
3287 mark_decl_referenced (DECL_CONTEXT (t));
3296 /* Java requires that we be able to reference a local address for a
3297 method, and not be confused by PLT entries. If hidden aliases are
3298 supported, emit one for each java function that we've emitted. */
3301 build_java_method_aliases (void)
3303 struct cgraph_node *node;
3305 #ifndef HAVE_GAS_HIDDEN
3309 for (node = cgraph_nodes; node ; node = node->next)
3311 tree fndecl = node->decl;
3313 if (TREE_ASM_WRITTEN (fndecl)
3314 && DECL_CONTEXT (fndecl)
3315 && TYPE_P (DECL_CONTEXT (fndecl))
3316 && TYPE_FOR_JAVA (DECL_CONTEXT (fndecl))
3317 && TARGET_USE_LOCAL_THUNK_ALIAS_P (fndecl))
3319 /* Mangle the name in a predictable way; we need to reference
3320 this from a java compiled object file. */
3321 tree oid, nid, alias;
3325 oid = DECL_ASSEMBLER_NAME (fndecl);
3326 oname = IDENTIFIER_POINTER (oid);
3327 gcc_assert (oname[0] == '_' && oname[1] == 'Z');
3328 nname = ACONCAT (("_ZGA", oname+2, NULL));
3329 nid = get_identifier (nname);
3331 alias = make_alias_for (fndecl, nid);
3332 TREE_PUBLIC (alias) = 1;
3333 DECL_VISIBILITY (alias) = VISIBILITY_HIDDEN;
3335 assemble_alias (alias, oid);
3340 /* Returns true iff there is a definition available for variable or
3344 decl_defined_p (tree decl)
3346 if (TREE_CODE (decl) == FUNCTION_DECL)
3347 return (DECL_INITIAL (decl) != NULL_TREE);
3350 gcc_assert (TREE_CODE (decl) == VAR_DECL);
3351 return !DECL_EXTERNAL (decl);
3355 /* Complain that DECL uses a type with no linkage but is never defined. */
3358 no_linkage_error (tree decl)
3360 tree t = no_linkage_check (TREE_TYPE (decl), /*relaxed_p=*/false);
3361 if (TYPE_ANONYMOUS_P (t))
3363 permerror (0, "%q+#D, declared using anonymous type, "
3364 "is used but never defined", decl);
3365 if (is_typedef_decl (TYPE_NAME (t)))
3366 permerror (0, "%q+#D does not refer to the unqualified type, "
3367 "so it is not used for linkage", TYPE_NAME (t));
3370 permerror (0, "%q+#D, declared using local type %qT, "
3371 "is used but never defined", decl, t);
3374 /* This routine is called at the end of compilation.
3375 Its job is to create all the code needed to initialize and
3376 destroy the global aggregates. We do the destruction
3377 first, since that way we only need to reverse the decls once. */
3380 cp_write_global_declarations (void)
3386 unsigned ssdf_count = 0;
3390 locus = input_location;
3393 /* Bad parse errors. Just forget about it. */
3394 if (! global_bindings_p () || current_class_type || decl_namespace_list)
3398 c_common_write_pch ();
3400 /* FIXME - huh? was input_line -= 1;*/
3402 /* We now have to write out all the stuff we put off writing out.
3405 o Template specializations that we have not yet instantiated,
3406 but which are needed.
3407 o Initialization and destruction for non-local objects with
3408 static storage duration. (Local objects with static storage
3409 duration are initialized when their scope is first entered,
3410 and are cleaned up via atexit.)
3411 o Virtual function tables.
3413 All of these may cause others to be needed. For example,
3414 instantiating one function may cause another to be needed, and
3415 generating the initializer for an object may cause templates to be
3416 instantiated, etc., etc. */
3418 timevar_push (TV_VARCONST);
3420 emit_support_tinfos ();
3429 /* If there are templates that we've put off instantiating, do
3431 instantiate_pending_templates (retries);
3434 /* Write out virtual tables as required. Note that writing out
3435 the virtual table for a template class may cause the
3436 instantiation of members of that class. If we write out
3437 vtables then we remove the class from our list so we don't
3438 have to look at it again. */
3440 while (keyed_classes != NULL_TREE
3441 && maybe_emit_vtables (TREE_VALUE (keyed_classes)))
3444 keyed_classes = TREE_CHAIN (keyed_classes);
3450 tree next = TREE_CHAIN (t);
3454 if (maybe_emit_vtables (TREE_VALUE (next)))
3457 TREE_CHAIN (t) = TREE_CHAIN (next);
3462 next = TREE_CHAIN (t);
3466 /* Write out needed type info variables. We have to be careful
3467 looping through unemitted decls, because emit_tinfo_decl may
3468 cause other variables to be needed. New elements will be
3469 appended, and we remove from the vector those that actually
3471 for (i = VEC_length (tree, unemitted_tinfo_decls);
3472 VEC_iterate (tree, unemitted_tinfo_decls, --i, t);)
3473 if (emit_tinfo_decl (t))
3476 VEC_unordered_remove (tree, unemitted_tinfo_decls, i);
3479 /* The list of objects with static storage duration is built up
3480 in reverse order. We clear STATIC_AGGREGATES so that any new
3481 aggregates added during the initialization of these will be
3482 initialized in the correct order when we next come around the
3484 vars = prune_vars_needing_no_initialization (&static_aggregates);
3488 /* We need to start a new initialization function each time
3489 through the loop. That's because we need to know which
3490 vtables have been referenced, and TREE_SYMBOL_REFERENCED
3491 isn't computed until a function is finished, and written
3492 out. That's a deficiency in the back end. When this is
3493 fixed, these initialization functions could all become
3494 inline, with resulting performance improvements. */
3497 /* Set the line and file, so that it is obviously not from
3499 input_location = locus;
3500 ssdf_body = start_static_storage_duration_function (ssdf_count);
3502 /* Make sure the back end knows about all the variables. */
3503 write_out_vars (vars);
3505 /* First generate code to do all the initializations. */
3507 do_static_initialization_or_destruction (vars, /*initp=*/true);
3509 /* Then, generate code to do all the destructions. Do these
3510 in reverse order so that the most recently constructed
3511 variable is the first destroyed. If we're using
3512 __cxa_atexit, then we don't need to do this; functions
3513 were registered at initialization time to destroy the
3515 if (!flag_use_cxa_atexit && vars)
3517 vars = nreverse (vars);
3518 do_static_initialization_or_destruction (vars, /*initp=*/false);
3523 /* Finish up the static storage duration function for this
3525 input_location = locus;
3526 finish_static_storage_duration_function (ssdf_body);
3528 /* All those initializations and finalizations might cause
3529 us to need more inline functions, more template
3530 instantiations, etc. */
3533 /* ??? was: locus.line++; */
3536 /* Go through the set of inline functions whose bodies have not
3537 been emitted yet. If out-of-line copies of these functions
3538 are required, emit them. */
3539 for (i = 0; VEC_iterate (tree, deferred_fns, i, decl); ++i)
3541 /* Does it need synthesizing? */
3542 if (DECL_DEFAULTED_FN (decl) && ! DECL_INITIAL (decl)
3543 && (! DECL_REALLY_EXTERN (decl) || possibly_inlined_p (decl)))
3545 /* Even though we're already at the top-level, we push
3546 there again. That way, when we pop back a few lines
3547 hence, all of our state is restored. Otherwise,
3548 finish_function doesn't clean things up, and we end
3549 up with CURRENT_FUNCTION_DECL set. */
3550 push_to_top_level ();
3551 /* The decl's location will mark where it was first
3552 needed. Save that so synthesize method can indicate
3553 where it was needed from, in case of error */
3554 input_location = DECL_SOURCE_LOCATION (decl);
3555 synthesize_method (decl);
3556 pop_from_top_level ();
3560 if (!DECL_SAVED_TREE (decl))
3563 /* We lie to the back end, pretending that some functions
3564 are not defined when they really are. This keeps these
3565 functions from being put out unnecessarily. But, we must
3566 stop lying when the functions are referenced, or if they
3567 are not comdat since they need to be put out now. If
3568 DECL_INTERFACE_KNOWN, then we have already set
3569 DECL_EXTERNAL appropriately, so there's no need to check
3570 again, and we do not want to clear DECL_EXTERNAL if a
3571 previous call to import_export_decl set it.
3573 This is done in a separate for cycle, because if some
3574 deferred function is contained in another deferred
3575 function later in deferred_fns varray,
3576 rest_of_compilation would skip this function and we
3577 really cannot expand the same function twice. */
3578 import_export_decl (decl);
3579 if (DECL_NOT_REALLY_EXTERN (decl)
3580 && DECL_INITIAL (decl)
3581 && decl_needed_p (decl))
3582 DECL_EXTERNAL (decl) = 0;
3584 /* If we're going to need to write this function out, and
3585 there's already a body for it, create RTL for it now.
3586 (There might be no body if this is a method we haven't
3587 gotten around to synthesizing yet.) */
3588 if (!DECL_EXTERNAL (decl)
3589 && decl_needed_p (decl)
3590 && !TREE_ASM_WRITTEN (decl)
3591 && !cgraph_node (decl)->local.finalized)
3593 /* We will output the function; no longer consider it in this
3595 DECL_DEFER_OUTPUT (decl) = 0;
3596 /* Generate RTL for this function now that we know we
3598 expand_or_defer_fn (decl);
3599 /* If we're compiling -fsyntax-only pretend that this
3600 function has been written out so that we don't try to
3602 if (flag_syntax_only)
3603 TREE_ASM_WRITTEN (decl) = 1;
3608 if (walk_namespaces (wrapup_globals_for_namespace, /*data=*/0))
3611 /* Static data members are just like namespace-scope globals. */
3612 for (i = 0; VEC_iterate (tree, pending_statics, i, decl); ++i)
3614 if (var_finalized_p (decl) || DECL_REALLY_EXTERN (decl)
3615 /* Don't write it out if we haven't seen a definition. */
3616 || DECL_IN_AGGR_P (decl))
3618 import_export_decl (decl);
3619 /* If this static data member is needed, provide it to the
3621 if (DECL_NOT_REALLY_EXTERN (decl) && decl_needed_p (decl))
3622 DECL_EXTERNAL (decl) = 0;
3624 if (VEC_length (tree, pending_statics) != 0
3625 && wrapup_global_declarations (VEC_address (tree, pending_statics),
3626 VEC_length (tree, pending_statics)))
3633 /* All used inline functions must have a definition at this point. */
3634 for (i = 0; VEC_iterate (tree, deferred_fns, i, decl); ++i)
3636 if (/* Check online inline functions that were actually used. */
3637 TREE_USED (decl) && DECL_DECLARED_INLINE_P (decl)
3638 /* If the definition actually was available here, then the
3639 fact that the function was not defined merely represents
3640 that for some reason (use of a template repository,
3641 #pragma interface, etc.) we decided not to emit the
3643 && !DECL_INITIAL (decl)
3644 /* An explicit instantiation can be used to specify
3645 that the body is in another unit. It will have
3646 already verified there was a definition. */
3647 && !DECL_EXPLICIT_INSTANTIATION (decl))
3649 warning (0, "inline function %q+D used but never defined", decl);
3650 /* Avoid a duplicate warning from check_global_declaration_1. */
3651 TREE_NO_WARNING (decl) = 1;
3655 /* So must decls that use a type with no linkage. */
3656 for (i = 0; VEC_iterate (tree, no_linkage_decls, i, decl); ++i)
3657 if (!decl_defined_p (decl))
3658 no_linkage_error (decl);
3660 /* We give C linkage to static constructors and destructors. */
3661 push_lang_context (lang_name_c);
3663 /* Generate initialization and destruction functions for all
3664 priorities for which they are required. */
3665 if (priority_info_map)
3666 splay_tree_foreach (priority_info_map,
3667 generate_ctor_and_dtor_functions_for_priority,
3669 else if (c_dialect_objc () && objc_static_init_needed_p ())
3670 /* If this is obj-c++ and we need a static init, call
3671 generate_ctor_or_dtor_function. */
3672 generate_ctor_or_dtor_function (/*constructor_p=*/true,
3673 DEFAULT_INIT_PRIORITY, &locus);
3675 /* We're done with the splay-tree now. */
3676 if (priority_info_map)
3677 splay_tree_delete (priority_info_map);
3679 /* Generate any missing aliases. */
3680 maybe_apply_pending_pragma_weaks ();
3682 /* We're done with static constructors, so we can go back to "C++"
3684 pop_lang_context ();
3686 cgraph_finalize_compilation_unit ();
3688 /* Now, issue warnings about static, but not defined, functions,
3689 etc., and emit debugging information. */
3690 walk_namespaces (wrapup_globals_for_namespace, /*data=*/&reconsider);
3691 if (VEC_length (tree, pending_statics) != 0)
3693 check_global_declarations (VEC_address (tree, pending_statics),
3694 VEC_length (tree, pending_statics));
3695 emit_debug_global_declarations (VEC_address (tree, pending_statics),
3696 VEC_length (tree, pending_statics));
3699 /* Generate hidden aliases for Java. */
3700 build_java_method_aliases ();
3704 /* The entire file is now complete. If requested, dump everything
3708 FILE *stream = dump_begin (TDI_tu, &flags);
3712 dump_node (global_namespace, flags & ~TDF_SLIM, stream);
3713 dump_end (TDI_tu, stream);
3717 timevar_pop (TV_VARCONST);
3719 if (flag_detailed_statistics)
3721 dump_tree_statistics ();
3722 dump_time_statistics ();
3724 input_location = locus;
3726 #ifdef ENABLE_CHECKING
3727 validate_conversion_obstack ();
3728 #endif /* ENABLE_CHECKING */
3731 /* FN is an OFFSET_REF, DOTSTAR_EXPR or MEMBER_REF indicating the
3732 function to call in parse-tree form; it has not yet been
3733 semantically analyzed. ARGS are the arguments to the function.
3734 They have already been semantically analyzed. This may change
3738 build_offset_ref_call_from_tree (tree fn, VEC(tree,gc) **args)
3741 VEC(tree,gc) *orig_args = NULL;
3746 object = TREE_OPERAND (fn, 0);
3748 if (processing_template_decl)
3750 gcc_assert (TREE_CODE (fn) == DOTSTAR_EXPR
3751 || TREE_CODE (fn) == MEMBER_REF);
3752 if (type_dependent_expression_p (fn)
3753 || any_type_dependent_arguments_p (*args))
3754 return build_nt_call_vec (fn, *args);
3756 orig_args = make_tree_vector_copy (*args);
3758 /* Transform the arguments and add the implicit "this"
3759 parameter. That must be done before the FN is transformed
3760 because we depend on the form of FN. */
3761 make_args_non_dependent (*args);
3762 object = build_non_dependent_expr (object);
3763 if (TREE_CODE (fn) == DOTSTAR_EXPR)
3764 object = cp_build_unary_op (ADDR_EXPR, object, 0, tf_warning_or_error);
3765 VEC_safe_insert (tree, gc, *args, 0, object);
3766 /* Now that the arguments are done, transform FN. */
3767 fn = build_non_dependent_expr (fn);
3770 /* A qualified name corresponding to a bound pointer-to-member is
3771 represented as an OFFSET_REF:
3773 struct B { void g(); };
3775 void B::g() { (this->*p)(); } */
3776 if (TREE_CODE (fn) == OFFSET_REF)
3778 tree object_addr = cp_build_unary_op (ADDR_EXPR, object, 0,
3779 tf_warning_or_error);
3780 fn = TREE_OPERAND (fn, 1);
3781 fn = get_member_function_from_ptrfunc (&object_addr, fn);
3782 VEC_safe_insert (tree, gc, *args, 0, object_addr);
3785 expr = cp_build_function_call_vec (fn, args, tf_warning_or_error);
3786 if (processing_template_decl && expr != error_mark_node)
3787 expr = build_min_non_dep_call_vec (expr, orig_fn, orig_args);
3789 if (orig_args != NULL)
3790 release_tree_vector (orig_args);
3797 check_default_args (tree x)
3799 tree arg = TYPE_ARG_TYPES (TREE_TYPE (x));
3800 bool saw_def = false;
3801 int i = 0 - (TREE_CODE (TREE_TYPE (x)) == METHOD_TYPE);
3802 for (; arg && arg != void_list_node; arg = TREE_CHAIN (arg), ++i)
3804 if (TREE_PURPOSE (arg))
3808 error ("default argument missing for parameter %P of %q+#D", i, x);
3809 TREE_PURPOSE (arg) = error_mark_node;
3814 /* Return true if function DECL can be inlined. This is used to force
3815 instantiation of methods that might be interesting for inlining. */
3817 possibly_inlined_p (tree decl)
3819 gcc_assert (TREE_CODE (decl) == FUNCTION_DECL);
3820 if (DECL_UNINLINABLE (decl))
3822 if (!optimize || pragma_java_exceptions)
3823 return DECL_DECLARED_INLINE_P (decl);
3824 /* When optimizing, we might inline everything when flatten
3825 attribute or heuristics inlining for size or autoinlining
3830 /* Mark DECL (either a _DECL or a BASELINK) as "used" in the program.
3831 If DECL is a specialization or implicitly declared class member,
3832 generate the actual definition. */
3835 mark_used (tree decl)
3837 HOST_WIDE_INT saved_processing_template_decl = 0;
3839 /* If DECL is a BASELINK for a single function, then treat it just
3840 like the DECL for the function. Otherwise, if the BASELINK is
3841 for an overloaded function, we don't know which function was
3842 actually used until after overload resolution. */
3843 if (TREE_CODE (decl) == BASELINK)
3845 decl = BASELINK_FUNCTIONS (decl);
3846 if (really_overloaded_fn (decl))
3848 decl = OVL_CURRENT (decl);
3851 TREE_USED (decl) = 1;
3852 if (DECL_CLONED_FUNCTION_P (decl))
3853 TREE_USED (DECL_CLONED_FUNCTION (decl)) = 1;
3854 if (TREE_CODE (decl) == FUNCTION_DECL
3855 && DECL_DELETED_FN (decl))
3857 error ("deleted function %q+D", decl);
3858 error ("used here");
3861 /* If we don't need a value, then we don't need to synthesize DECL. */
3862 if (cp_unevaluated_operand != 0)
3865 /* If within finish_function, defer the rest until that function
3866 finishes, otherwise it might recurse. */
3867 if (defer_mark_used_calls)
3869 VEC_safe_push (tree, gc, deferred_mark_used_calls, decl);
3873 /* Normally, we can wait until instantiation-time to synthesize
3874 DECL. However, if DECL is a static data member initialized with
3875 a constant, we need the value right now because a reference to
3876 such a data member is not value-dependent. */
3877 if (TREE_CODE (decl) == VAR_DECL
3878 && DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl)
3879 && DECL_CLASS_SCOPE_P (decl))
3881 /* Don't try to instantiate members of dependent types. We
3882 cannot just use dependent_type_p here because this function
3883 may be called from fold_non_dependent_expr, and then we may
3884 see dependent types, even though processing_template_decl
3886 if (CLASSTYPE_TEMPLATE_INFO ((DECL_CONTEXT (decl)))
3887 && uses_template_parms (CLASSTYPE_TI_ARGS (DECL_CONTEXT (decl))))
3889 /* Pretend that we are not in a template, even if we are, so
3890 that the static data member initializer will be processed. */
3891 saved_processing_template_decl = processing_template_decl;
3892 processing_template_decl = 0;
3895 if (processing_template_decl)
3898 /* DR 757: A type without linkage shall not be used as the type of a
3899 variable or function with linkage, unless
3900 o the variable or function has extern "C" linkage (7.5 [dcl.link]), or
3901 o the variable or function is not used (3.2 [basic.def.odr]) or is
3902 defined in the same translation unit. */
3903 if (TREE_PUBLIC (decl)
3904 && (TREE_CODE (decl) == FUNCTION_DECL
3905 || TREE_CODE (decl) == VAR_DECL)
3906 && DECL_LANG_SPECIFIC (decl)
3907 && !DECL_NO_LINKAGE_CHECKED (decl))
3909 DECL_NO_LINKAGE_CHECKED (decl) = true;
3910 if (!DECL_EXTERN_C_P (decl)
3911 && !DECL_ARTIFICIAL (decl)
3912 && !decl_defined_p (decl)
3913 && no_linkage_check (TREE_TYPE (decl), /*relaxed_p=*/false))
3915 if (is_local_extern (decl))
3916 /* There's no way to define a local extern, and adding it to
3917 the vector interferes with GC, so give an error now. */
3918 no_linkage_error (decl);
3920 VEC_safe_push (tree, gc, no_linkage_decls, decl);
3924 if (TREE_CODE (decl) == FUNCTION_DECL && DECL_DECLARED_INLINE_P (decl)
3925 && !TREE_ASM_WRITTEN (decl))
3926 /* Remember it, so we can check it was defined. */
3928 if (DECL_DEFERRED_FN (decl))
3931 /* Remember the current location for a function we will end up
3932 synthesizing. Then we can inform the user where it was
3933 required in the case of error. */
3934 if (DECL_ARTIFICIAL (decl) && DECL_NONSTATIC_MEMBER_FUNCTION_P (decl)
3935 && !DECL_THUNK_P (decl))
3936 DECL_SOURCE_LOCATION (decl) = input_location;
3938 note_vague_linkage_fn (decl);
3941 /* Is it a synthesized method that needs to be synthesized? */
3942 if (TREE_CODE (decl) == FUNCTION_DECL
3943 && DECL_NONSTATIC_MEMBER_FUNCTION_P (decl)
3944 && DECL_DEFAULTED_FN (decl)
3945 && !DECL_THUNK_P (decl)
3946 && ! DECL_INITIAL (decl)
3947 /* Kludge: don't synthesize for default args. Unfortunately this
3948 rules out initializers of namespace-scoped objects too, but
3949 it's sort-of ok if the implicit ctor or dtor decl keeps
3950 pointing to the class location. */
3951 && current_function_decl)
3953 synthesize_method (decl);
3954 /* If we've already synthesized the method we don't need to
3955 do the instantiation test below. */
3957 else if ((DECL_NON_THUNK_FUNCTION_P (decl) || TREE_CODE (decl) == VAR_DECL)
3958 && DECL_LANG_SPECIFIC (decl) && DECL_TEMPLATE_INFO (decl)
3959 && (!DECL_EXPLICIT_INSTANTIATION (decl)
3960 || (TREE_CODE (decl) == FUNCTION_DECL
3961 && possibly_inlined_p
3962 (DECL_TEMPLATE_RESULT (
3963 template_for_substitution (decl))))
3964 /* We need to instantiate static data members so that there
3965 initializers are available in integral constant
3967 || (TREE_CODE (decl) == VAR_DECL
3968 && DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl))))
3969 /* If this is a function or variable that is an instance of some
3970 template, we now know that we will need to actually do the
3971 instantiation. We check that DECL is not an explicit
3972 instantiation because that is not checked in instantiate_decl.
3974 We put off instantiating functions in order to improve compile
3975 times. Maintaining a stack of active functions is expensive,
3976 and the inliner knows to instantiate any functions it might
3977 need. Therefore, we always try to defer instantiation. */
3978 instantiate_decl (decl, /*defer_ok=*/true,
3979 /*expl_inst_class_mem_p=*/false);
3981 processing_template_decl = saved_processing_template_decl;
3984 #include "gt-cp-decl2.h"