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, 2010,
4 2011 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"
44 #include "c-family/c-common.h"
45 #include "c-family/c-objc.h"
47 #include "tree-inline.h"
48 #include "c-family/c-pragma.h"
49 #include "tree-dump.h"
52 #include "pointer-set.h"
53 #include "splay-tree.h"
54 #include "langhooks.h"
55 #include "c-family/c-ada-spec.h"
57 extern cpp_reader *parse_in;
59 /* This structure contains information about the initializations
60 and/or destructions required for a particular priority level. */
61 typedef struct priority_info_s {
62 /* Nonzero if there have been any initializations at this priority
63 throughout the translation unit. */
64 int initializations_p;
65 /* Nonzero if there have been any destructions at this priority
66 throughout the translation unit. */
70 static void mark_vtable_entries (tree);
71 static bool maybe_emit_vtables (tree);
72 static bool acceptable_java_type (tree);
73 static tree start_objects (int, int);
74 static void finish_objects (int, int, tree);
75 static tree start_static_storage_duration_function (unsigned);
76 static void finish_static_storage_duration_function (tree);
77 static priority_info get_priority_info (int);
78 static void do_static_initialization_or_destruction (tree, bool);
79 static void one_static_initialization_or_destruction (tree, tree, bool);
80 static void generate_ctor_or_dtor_function (bool, int, location_t *);
81 static int generate_ctor_and_dtor_functions_for_priority (splay_tree_node,
83 static tree prune_vars_needing_no_initialization (tree *);
84 static void write_out_vars (tree);
85 static void import_export_class (tree);
86 static tree get_guard_bits (tree);
87 static void determine_visibility_from_class (tree, tree);
88 static bool determine_hidden_inline (tree);
89 static bool decl_defined_p (tree);
91 /* A list of static class variables. This is needed, because a
92 static class variable can be declared inside the class without
93 an initializer, and then initialized, statically, outside the class. */
94 static GTY(()) VEC(tree,gc) *pending_statics;
96 /* A list of functions which were declared inline, but which we
97 may need to emit outline anyway. */
98 static GTY(()) VEC(tree,gc) *deferred_fns;
100 /* A list of decls that use types with no linkage, which we need to make
102 static GTY(()) VEC(tree,gc) *no_linkage_decls;
104 /* Nonzero if we're done parsing and into end-of-file activities. */
110 /* Return a member function type (a METHOD_TYPE), given FNTYPE (a
111 FUNCTION_TYPE), CTYPE (class type), and QUALS (the cv-qualifiers
112 that apply to the function). */
115 build_memfn_type (tree fntype, tree ctype, cp_cv_quals quals)
121 if (fntype == error_mark_node || ctype == error_mark_node)
122 return error_mark_node;
124 gcc_assert (TREE_CODE (fntype) == FUNCTION_TYPE
125 || TREE_CODE (fntype) == METHOD_TYPE);
127 type_quals = quals & ~TYPE_QUAL_RESTRICT;
128 ctype = cp_build_qualified_type (ctype, type_quals);
129 raises = TYPE_RAISES_EXCEPTIONS (fntype);
130 attrs = TYPE_ATTRIBUTES (fntype);
131 fntype = build_method_type_directly (ctype, TREE_TYPE (fntype),
132 (TREE_CODE (fntype) == METHOD_TYPE
133 ? TREE_CHAIN (TYPE_ARG_TYPES (fntype))
134 : TYPE_ARG_TYPES (fntype)));
136 fntype = build_exception_variant (fntype, raises);
138 fntype = cp_build_type_attribute_variant (fntype, attrs);
143 /* Return a variant of FNTYPE, a FUNCTION_TYPE or METHOD_TYPE, with its
144 return type changed to NEW_RET. */
147 change_return_type (tree new_ret, tree fntype)
150 tree args = TYPE_ARG_TYPES (fntype);
151 tree raises = TYPE_RAISES_EXCEPTIONS (fntype);
152 tree attrs = TYPE_ATTRIBUTES (fntype);
154 if (same_type_p (new_ret, TREE_TYPE (fntype)))
157 if (TREE_CODE (fntype) == FUNCTION_TYPE)
159 newtype = build_function_type (new_ret, args);
160 newtype = apply_memfn_quals (newtype, type_memfn_quals (fntype));
163 newtype = build_method_type_directly
164 (class_of_this_parm (fntype), new_ret, TREE_CHAIN (args));
166 newtype = build_exception_variant (newtype, raises);
168 newtype = cp_build_type_attribute_variant (newtype, attrs);
173 /* Build a PARM_DECL with NAME and TYPE, and set DECL_ARG_TYPE
177 cp_build_parm_decl (tree name, tree type)
179 tree parm = build_decl (input_location,
180 PARM_DECL, name, type);
181 /* DECL_ARG_TYPE is only used by the back end and the back end never
183 if (!processing_template_decl)
184 DECL_ARG_TYPE (parm) = type_passed_as (type);
186 /* If the type is a pack expansion, then we have a function
188 if (type && TREE_CODE (type) == TYPE_PACK_EXPANSION)
189 FUNCTION_PARAMETER_PACK_P (parm) = 1;
194 /* Returns a PARM_DECL for a parameter of the indicated TYPE, with the
198 build_artificial_parm (tree name, tree type)
200 tree parm = cp_build_parm_decl (name, type);
201 DECL_ARTIFICIAL (parm) = 1;
202 /* All our artificial parms are implicitly `const'; they cannot be
204 TREE_READONLY (parm) = 1;
208 /* Constructors for types with virtual baseclasses need an "in-charge" flag
209 saying whether this constructor is responsible for initialization of
210 virtual baseclasses or not. All destructors also need this "in-charge"
211 flag, which additionally determines whether or not the destructor should
212 free the memory for the object.
214 This function adds the "in-charge" flag to member function FN if
215 appropriate. It is called from grokclassfn and tsubst.
216 FN must be either a constructor or destructor.
218 The in-charge flag follows the 'this' parameter, and is followed by the
219 VTT parm (if any), then the user-written parms. */
222 maybe_retrofit_in_chrg (tree fn)
224 tree basetype, arg_types, parms, parm, fntype;
226 /* If we've already add the in-charge parameter don't do it again. */
227 if (DECL_HAS_IN_CHARGE_PARM_P (fn))
230 /* When processing templates we can't know, in general, whether or
231 not we're going to have virtual baseclasses. */
232 if (processing_template_decl)
235 /* We don't need an in-charge parameter for constructors that don't
236 have virtual bases. */
237 if (DECL_CONSTRUCTOR_P (fn)
238 && !CLASSTYPE_VBASECLASSES (DECL_CONTEXT (fn)))
241 arg_types = TYPE_ARG_TYPES (TREE_TYPE (fn));
242 basetype = TREE_TYPE (TREE_VALUE (arg_types));
243 arg_types = TREE_CHAIN (arg_types);
245 parms = DECL_CHAIN (DECL_ARGUMENTS (fn));
247 /* If this is a subobject constructor or destructor, our caller will
248 pass us a pointer to our VTT. */
249 if (CLASSTYPE_VBASECLASSES (DECL_CONTEXT (fn)))
251 parm = build_artificial_parm (vtt_parm_identifier, vtt_parm_type);
253 /* First add it to DECL_ARGUMENTS between 'this' and the real args... */
254 DECL_CHAIN (parm) = parms;
257 /* ...and then to TYPE_ARG_TYPES. */
258 arg_types = hash_tree_chain (vtt_parm_type, arg_types);
260 DECL_HAS_VTT_PARM_P (fn) = 1;
263 /* Then add the in-charge parm (before the VTT parm). */
264 parm = build_artificial_parm (in_charge_identifier, integer_type_node);
265 DECL_CHAIN (parm) = parms;
267 arg_types = hash_tree_chain (integer_type_node, arg_types);
269 /* Insert our new parameter(s) into the list. */
270 DECL_CHAIN (DECL_ARGUMENTS (fn)) = parms;
272 /* And rebuild the function type. */
273 fntype = build_method_type_directly (basetype, TREE_TYPE (TREE_TYPE (fn)),
275 if (TYPE_RAISES_EXCEPTIONS (TREE_TYPE (fn)))
276 fntype = build_exception_variant (fntype,
277 TYPE_RAISES_EXCEPTIONS (TREE_TYPE (fn)));
278 if (TYPE_ATTRIBUTES (TREE_TYPE (fn)))
279 fntype = (cp_build_type_attribute_variant
280 (fntype, TYPE_ATTRIBUTES (TREE_TYPE (fn))));
281 TREE_TYPE (fn) = fntype;
283 /* Now we've got the in-charge parameter. */
284 DECL_HAS_IN_CHARGE_PARM_P (fn) = 1;
287 /* Classes overload their constituent function names automatically.
288 When a function name is declared in a record structure,
289 its name is changed to it overloaded name. Since names for
290 constructors and destructors can conflict, we place a leading
293 CNAME is the name of the class we are grokking for.
295 FUNCTION is a FUNCTION_DECL. It was created by `grokdeclarator'.
297 FLAGS contains bits saying what's special about today's
298 arguments. DTOR_FLAG == DESTRUCTOR.
300 If FUNCTION is a destructor, then we must add the `auto-delete' field
301 as a second parameter. There is some hair associated with the fact
302 that we must "declare" this variable in the manner consistent with the
303 way the rest of the arguments were declared.
305 QUALS are the qualifiers for the this pointer. */
308 grokclassfn (tree ctype, tree function, enum overload_flags flags)
310 tree fn_name = DECL_NAME (function);
312 /* Even within an `extern "C"' block, members get C++ linkage. See
313 [dcl.link] for details. */
314 SET_DECL_LANGUAGE (function, lang_cplusplus);
316 if (fn_name == NULL_TREE)
318 error ("name missing for member function");
319 fn_name = get_identifier ("<anonymous>");
320 DECL_NAME (function) = fn_name;
323 DECL_CONTEXT (function) = ctype;
325 if (flags == DTOR_FLAG)
326 DECL_DESTRUCTOR_P (function) = 1;
328 if (flags == DTOR_FLAG || DECL_CONSTRUCTOR_P (function))
329 maybe_retrofit_in_chrg (function);
332 /* Create an ARRAY_REF, checking for the user doing things backwards
336 grok_array_decl (tree array_expr, tree index_exp)
340 tree orig_array_expr = array_expr;
341 tree orig_index_exp = index_exp;
343 if (error_operand_p (array_expr) || error_operand_p (index_exp))
344 return error_mark_node;
346 if (processing_template_decl)
348 if (type_dependent_expression_p (array_expr)
349 || type_dependent_expression_p (index_exp))
350 return build_min_nt (ARRAY_REF, array_expr, index_exp,
351 NULL_TREE, NULL_TREE);
352 array_expr = build_non_dependent_expr (array_expr);
353 index_exp = build_non_dependent_expr (index_exp);
356 type = TREE_TYPE (array_expr);
358 type = non_reference (type);
360 /* If they have an `operator[]', use that. */
361 if (MAYBE_CLASS_TYPE_P (type) || MAYBE_CLASS_TYPE_P (TREE_TYPE (index_exp)))
362 expr = build_new_op (ARRAY_REF, LOOKUP_NORMAL,
363 array_expr, index_exp, NULL_TREE,
364 /*overload=*/NULL, tf_warning_or_error);
369 /* Otherwise, create an ARRAY_REF for a pointer or array type.
370 It is a little-known fact that, if `a' is an array and `i' is
371 an int, you can write `i[a]', which means the same thing as
373 if (TREE_CODE (type) == ARRAY_TYPE)
376 p1 = build_expr_type_conversion (WANT_POINTER, array_expr, false);
378 if (TREE_CODE (TREE_TYPE (index_exp)) == ARRAY_TYPE)
381 p2 = build_expr_type_conversion (WANT_POINTER, index_exp, false);
383 i1 = build_expr_type_conversion (WANT_INT | WANT_ENUM, array_expr,
385 i2 = build_expr_type_conversion (WANT_INT | WANT_ENUM, index_exp,
388 if ((p1 && i2) && (i1 && p2))
389 error ("ambiguous conversion for array subscript");
392 array_expr = p1, index_exp = i2;
394 array_expr = p2, index_exp = i1;
397 error ("invalid types %<%T[%T]%> for array subscript",
398 type, TREE_TYPE (index_exp));
399 return error_mark_node;
402 if (array_expr == error_mark_node || index_exp == error_mark_node)
403 error ("ambiguous conversion for array subscript");
405 expr = build_array_ref (input_location, array_expr, index_exp);
407 if (processing_template_decl && expr != error_mark_node)
408 return build_min_non_dep (ARRAY_REF, expr, orig_array_expr, orig_index_exp,
409 NULL_TREE, NULL_TREE);
413 /* Given the cast expression EXP, checking out its validity. Either return
414 an error_mark_node if there was an unavoidable error, return a cast to
415 void for trying to delete a pointer w/ the value 0, or return the
416 call to delete. If DOING_VEC is true, we handle things differently
417 for doing an array delete.
418 Implements ARM $5.3.4. This is called from the parser. */
421 delete_sanity (tree exp, tree size, bool doing_vec, int use_global_delete,
422 tsubst_flags_t complain)
426 if (exp == error_mark_node)
429 if (processing_template_decl)
431 t = build_min (DELETE_EXPR, void_type_node, exp, size);
432 DELETE_EXPR_USE_GLOBAL (t) = use_global_delete;
433 DELETE_EXPR_USE_VEC (t) = doing_vec;
434 TREE_SIDE_EFFECTS (t) = 1;
438 /* An array can't have been allocated by new, so complain. */
439 if (TREE_CODE (exp) == VAR_DECL
440 && TREE_CODE (TREE_TYPE (exp)) == ARRAY_TYPE)
441 warning (0, "deleting array %q#D", exp);
443 t = build_expr_type_conversion (WANT_POINTER, exp, true);
445 if (t == NULL_TREE || t == error_mark_node)
447 error ("type %q#T argument given to %<delete%>, expected pointer",
449 return error_mark_node;
452 type = TREE_TYPE (t);
454 /* As of Valley Forge, you can delete a pointer to const. */
456 /* You can't delete functions. */
457 if (TREE_CODE (TREE_TYPE (type)) == FUNCTION_TYPE)
459 error ("cannot delete a function. Only pointer-to-objects are "
460 "valid arguments to %<delete%>");
461 return error_mark_node;
464 /* Deleting ptr to void is undefined behavior [expr.delete/3]. */
465 if (TREE_CODE (TREE_TYPE (type)) == VOID_TYPE)
467 warning (0, "deleting %qT is undefined", type);
471 /* Deleting a pointer with the value zero is valid and has no effect. */
472 if (integer_zerop (t))
473 return build1 (NOP_EXPR, void_type_node, t);
476 return build_vec_delete (t, /*maxindex=*/NULL_TREE,
477 sfk_deleting_destructor,
478 use_global_delete, complain);
480 return build_delete (type, t, sfk_deleting_destructor,
481 LOOKUP_NORMAL, use_global_delete,
485 /* Report an error if the indicated template declaration is not the
486 sort of thing that should be a member template. */
489 check_member_template (tree tmpl)
493 gcc_assert (TREE_CODE (tmpl) == TEMPLATE_DECL);
494 decl = DECL_TEMPLATE_RESULT (tmpl);
496 if (TREE_CODE (decl) == FUNCTION_DECL
497 || DECL_ALIAS_TEMPLATE_P (tmpl)
498 || (TREE_CODE (decl) == TYPE_DECL
499 && MAYBE_CLASS_TYPE_P (TREE_TYPE (decl))))
501 /* The parser rejects template declarations in local classes. */
502 gcc_assert (!current_function_decl);
503 /* The parser rejects any use of virtual in a function template. */
504 gcc_assert (!(TREE_CODE (decl) == FUNCTION_DECL
505 && DECL_VIRTUAL_P (decl)));
507 /* The debug-information generating code doesn't know what to do
508 with member templates. */
509 DECL_IGNORED_P (tmpl) = 1;
512 error ("template declaration of %q#D", decl);
515 /* Return true iff TYPE is a valid Java parameter or return type. */
518 acceptable_java_type (tree type)
520 if (type == error_mark_node)
523 if (TREE_CODE (type) == VOID_TYPE || TYPE_FOR_JAVA (type))
525 if (TREE_CODE (type) == POINTER_TYPE || TREE_CODE (type) == REFERENCE_TYPE)
527 type = TREE_TYPE (type);
528 if (TREE_CODE (type) == RECORD_TYPE)
531 if (! TYPE_FOR_JAVA (type))
533 if (! CLASSTYPE_TEMPLATE_INFO (type))
535 args = CLASSTYPE_TI_ARGS (type);
536 i = TREE_VEC_LENGTH (args);
539 type = TREE_VEC_ELT (args, i);
540 if (TREE_CODE (type) == POINTER_TYPE)
541 type = TREE_TYPE (type);
542 if (! TYPE_FOR_JAVA (type))
551 /* For a METHOD in a Java class CTYPE, return true if
552 the parameter and return types are valid Java types.
553 Otherwise, print appropriate error messages, and return false. */
556 check_java_method (tree method)
559 tree arg_types = TYPE_ARG_TYPES (TREE_TYPE (method));
560 tree ret_type = TREE_TYPE (TREE_TYPE (method));
562 if (!acceptable_java_type (ret_type))
564 error ("Java method %qD has non-Java return type %qT",
569 arg_types = TREE_CHAIN (arg_types);
570 if (DECL_HAS_IN_CHARGE_PARM_P (method))
571 arg_types = TREE_CHAIN (arg_types);
572 if (DECL_HAS_VTT_PARM_P (method))
573 arg_types = TREE_CHAIN (arg_types);
575 for (; arg_types != NULL_TREE; arg_types = TREE_CHAIN (arg_types))
577 tree type = TREE_VALUE (arg_types);
578 if (!acceptable_java_type (type))
580 if (type != error_mark_node)
581 error ("Java method %qD has non-Java parameter type %qT",
589 /* Sanity check: report error if this function FUNCTION is not
590 really a member of the class (CTYPE) it is supposed to belong to.
591 TEMPLATE_PARMS is used to specify the template parameters of a member
592 template passed as FUNCTION_DECL. If the member template is passed as a
593 TEMPLATE_DECL, it can be NULL since the parameters can be extracted
594 from the declaration. If the function is not a function template, it
596 It returns the original declaration for the function, NULL_TREE if
597 no declaration was found, error_mark_node if an error was emitted. */
600 check_classfn (tree ctype, tree function, tree template_parms)
606 if (DECL_USE_TEMPLATE (function)
607 && !(TREE_CODE (function) == TEMPLATE_DECL
608 && DECL_TEMPLATE_SPECIALIZATION (function))
609 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (function)))
610 /* Since this is a specialization of a member template,
611 we're not going to find the declaration in the class.
614 struct S { template <typename T> void f(T); };
615 template <> void S::f(int);
617 we're not going to find `S::f(int)', but there's no
618 reason we should, either. We let our callers know we didn't
619 find the method, but we don't complain. */
622 /* Basic sanity check: for a template function, the template parameters
623 either were not passed, or they are the same of DECL_TEMPLATE_PARMS. */
624 if (TREE_CODE (function) == TEMPLATE_DECL)
627 && !comp_template_parms (template_parms,
628 DECL_TEMPLATE_PARMS (function)))
630 error ("template parameter lists provided don%'t match the "
631 "template parameters of %qD", function);
632 return error_mark_node;
634 template_parms = DECL_TEMPLATE_PARMS (function);
637 /* OK, is this a definition of a member template? */
638 is_template = (template_parms != NULL_TREE);
640 /* We must enter the scope here, because conversion operators are
641 named by target type, and type equivalence relies on typenames
642 resolving within the scope of CTYPE. */
643 pushed_scope = push_scope (ctype);
644 ix = class_method_index_for_fn (complete_type (ctype), function);
647 VEC(tree,gc) *methods = CLASSTYPE_METHOD_VEC (ctype);
648 tree fndecls, fndecl = 0;
650 const char *format = NULL;
652 for (fndecls = VEC_index (tree, methods, ix);
653 fndecls; fndecls = OVL_NEXT (fndecls))
657 fndecl = OVL_CURRENT (fndecls);
658 p1 = TYPE_ARG_TYPES (TREE_TYPE (function));
659 p2 = TYPE_ARG_TYPES (TREE_TYPE (fndecl));
661 /* We cannot simply call decls_match because this doesn't
662 work for static member functions that are pretending to
663 be methods, and because the name may have been changed by
666 /* Get rid of the this parameter on functions that become
668 if (DECL_STATIC_FUNCTION_P (fndecl)
669 && TREE_CODE (TREE_TYPE (function)) == METHOD_TYPE)
670 p1 = TREE_CHAIN (p1);
672 /* A member template definition only matches a member template
674 if (is_template != (TREE_CODE (fndecl) == TEMPLATE_DECL))
677 if (same_type_p (TREE_TYPE (TREE_TYPE (function)),
678 TREE_TYPE (TREE_TYPE (fndecl)))
679 && compparms (p1, p2)
681 || comp_template_parms (template_parms,
682 DECL_TEMPLATE_PARMS (fndecl)))
683 && (DECL_TEMPLATE_SPECIALIZATION (function)
684 == DECL_TEMPLATE_SPECIALIZATION (fndecl))
685 && (!DECL_TEMPLATE_SPECIALIZATION (function)
686 || (DECL_TI_TEMPLATE (function)
687 == DECL_TI_TEMPLATE (fndecl))))
693 pop_scope (pushed_scope);
694 return OVL_CURRENT (fndecls);
697 error_at (DECL_SOURCE_LOCATION (function),
698 "prototype for %q#D does not match any in class %qT",
700 is_conv_op = DECL_CONV_FN_P (fndecl);
703 ix = CLASSTYPE_FIRST_CONVERSION_SLOT;
704 fndecls = VEC_index (tree, methods, ix);
707 fndecl = OVL_CURRENT (fndecls);
708 fndecls = OVL_NEXT (fndecls);
710 if (!fndecls && is_conv_op)
712 if (VEC_length (tree, methods) > (size_t) ++ix)
714 fndecls = VEC_index (tree, methods, ix);
715 if (!DECL_CONV_FN_P (OVL_CURRENT (fndecls)))
727 format = N_("candidates are: %+#D");
729 format = N_("candidate is: %+#D");
730 error (format, fndecl);
733 else if (!COMPLETE_TYPE_P (ctype))
734 cxx_incomplete_type_error (function, ctype);
736 error ("no %q#D member function declared in class %qT",
740 pop_scope (pushed_scope);
741 return error_mark_node;
744 /* DECL is a function with vague linkage. Remember it so that at the
745 end of the translation unit we can decide whether or not to emit
749 note_vague_linkage_fn (tree decl)
751 DECL_DEFER_OUTPUT (decl) = 1;
752 VEC_safe_push (tree, gc, deferred_fns, decl);
755 /* We have just processed the DECL, which is a static data member.
756 The other parameters are as for cp_finish_decl. */
759 finish_static_data_member_decl (tree decl,
760 tree init, bool init_const_expr_p,
764 DECL_CONTEXT (decl) = current_class_type;
766 /* We cannot call pushdecl here, because that would fill in the
767 TREE_CHAIN of our decl. Instead, we modify cp_finish_decl to do
768 the right thing, namely, to put this decl out straight away. */
770 if (! processing_template_decl)
771 VEC_safe_push (tree, gc, pending_statics, decl);
773 if (LOCAL_CLASS_P (current_class_type))
774 permerror (input_location, "local class %q#T shall not have static data member %q#D",
775 current_class_type, decl);
777 DECL_IN_AGGR_P (decl) = 1;
779 if (TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE
780 && TYPE_DOMAIN (TREE_TYPE (decl)) == NULL_TREE)
781 SET_VAR_HAD_UNKNOWN_BOUND (decl);
783 cp_finish_decl (decl, init, init_const_expr_p, asmspec_tree, flags);
786 /* DECLARATOR and DECLSPECS correspond to a class member. The other
787 parameters are as for cp_finish_decl. Return the DECL for the
788 class member declared. */
791 grokfield (const cp_declarator *declarator,
792 cp_decl_specifier_seq *declspecs,
793 tree init, bool init_const_expr_p,
798 const char *asmspec = 0;
803 && TREE_CODE (init) == TREE_LIST
804 && TREE_VALUE (init) == error_mark_node
805 && TREE_CHAIN (init) == NULL_TREE)
808 value = grokdeclarator (declarator, declspecs, FIELD, init != 0, &attrlist);
809 if (! value || error_operand_p (value))
810 /* friend or constructor went bad. */
811 return error_mark_node;
813 if (TREE_CODE (value) == TYPE_DECL && init)
815 error ("typedef %qD is initialized (use decltype instead)", value);
819 /* Pass friendly classes back. */
820 if (value == void_type_node)
823 /* Pass friend decls back. */
824 if ((TREE_CODE (value) == FUNCTION_DECL
825 || TREE_CODE (value) == TEMPLATE_DECL)
826 && DECL_CONTEXT (value) != current_class_type)
829 name = DECL_NAME (value);
831 if (name != NULL_TREE)
833 if (TREE_CODE (name) == TEMPLATE_ID_EXPR)
835 error ("explicit template argument list not allowed");
836 return error_mark_node;
839 if (IDENTIFIER_POINTER (name)[0] == '_'
840 && ! strcmp (IDENTIFIER_POINTER (name), "_vptr"))
841 error ("member %qD conflicts with virtual function table field name",
845 /* Stash away type declarations. */
846 if (TREE_CODE (value) == TYPE_DECL)
848 DECL_NONLOCAL (value) = 1;
849 DECL_CONTEXT (value) = current_class_type;
855 /* If this is a typedef that names the class for linkage purposes
856 (7.1.3p8), apply any attributes directly to the type. */
857 if (TAGGED_TYPE_P (TREE_TYPE (value))
858 && value == TYPE_NAME (TYPE_MAIN_VARIANT (TREE_TYPE (value))))
859 attrflags = ATTR_FLAG_TYPE_IN_PLACE;
861 cplus_decl_attributes (&value, attrlist, attrflags);
864 if (declspecs->specs[(int)ds_typedef]
865 && TREE_TYPE (value) != error_mark_node
866 && TYPE_NAME (TYPE_MAIN_VARIANT (TREE_TYPE (value))) != value)
867 set_underlying_type (value);
869 /* It's important that push_template_decl below follows
870 set_underlying_type above so that the created template
871 carries the properly set type of VALUE. */
872 if (processing_template_decl)
873 value = push_template_decl (value);
875 record_locally_defined_typedef (value);
879 if (DECL_IN_AGGR_P (value))
881 error ("%qD is already defined in %qT", value, DECL_CONTEXT (value));
882 return void_type_node;
885 if (asmspec_tree && asmspec_tree != error_mark_node)
886 asmspec = TREE_STRING_POINTER (asmspec_tree);
890 if (TREE_CODE (value) == FUNCTION_DECL)
892 /* Initializers for functions are rejected early in the parser.
893 If we get here, it must be a pure specifier for a method. */
894 if (init == ridpointers[(int)RID_DELETE])
896 DECL_DELETED_FN (value) = 1;
897 DECL_DECLARED_INLINE_P (value) = 1;
898 DECL_INITIAL (value) = error_mark_node;
900 else if (init == ridpointers[(int)RID_DEFAULT])
902 if (defaultable_fn_check (value))
904 DECL_DEFAULTED_FN (value) = 1;
905 DECL_INITIALIZED_IN_CLASS_P (value) = 1;
906 DECL_DECLARED_INLINE_P (value) = 1;
909 else if (TREE_CODE (init) == DEFAULT_ARG)
910 error ("invalid initializer for member function %qD", value);
911 else if (TREE_CODE (TREE_TYPE (value)) == METHOD_TYPE)
913 if (integer_zerop (init))
914 DECL_PURE_VIRTUAL_P (value) = 1;
915 else if (error_operand_p (init))
916 ; /* An error has already been reported. */
918 error ("invalid initializer for member function %qD",
923 gcc_assert (TREE_CODE (TREE_TYPE (value)) == FUNCTION_TYPE);
924 error ("initializer specified for static member function %qD",
928 else if (TREE_CODE (value) == FIELD_DECL)
929 /* C++11 NSDMI, keep going. */;
930 else if (TREE_CODE (value) != VAR_DECL)
932 else if (!processing_template_decl)
934 if (TREE_CODE (init) == CONSTRUCTOR)
935 init = digest_init (TREE_TYPE (value), init, tf_warning_or_error);
936 init = maybe_constant_init (init);
938 if (init != error_mark_node && !TREE_CONSTANT (init))
940 /* We can allow references to things that are effectively
941 static, since references are initialized with the
943 if (TREE_CODE (TREE_TYPE (value)) != REFERENCE_TYPE
944 || (TREE_STATIC (init) == 0
945 && (!DECL_P (init) || DECL_EXTERNAL (init) == 0)))
947 error ("field initializer is not constant");
948 init = error_mark_node;
954 if (processing_template_decl
955 && (TREE_CODE (value) == VAR_DECL || TREE_CODE (value) == FUNCTION_DECL))
957 value = push_template_decl (value);
958 if (error_operand_p (value))
959 return error_mark_node;
963 cplus_decl_attributes (&value, attrlist, 0);
965 if (init && BRACE_ENCLOSED_INITIALIZER_P (init)
966 && CONSTRUCTOR_IS_DIRECT_INIT (init))
967 flags = LOOKUP_NORMAL;
969 flags = LOOKUP_IMPLICIT;
971 switch (TREE_CODE (value))
974 finish_static_data_member_decl (value, init, init_const_expr_p,
975 asmspec_tree, flags);
980 error ("%<asm%> specifiers are not permitted on non-static data members");
981 if (DECL_INITIAL (value) == error_mark_node)
982 init = error_mark_node;
983 cp_finish_decl (value, init, /*init_const_expr_p=*/false,
985 DECL_IN_AGGR_P (value) = 1;
990 set_user_assembler_name (value, asmspec);
992 cp_finish_decl (value,
994 /*init_const_expr_p=*/false,
995 asmspec_tree, flags);
997 /* Pass friends back this way. */
998 if (DECL_FRIEND_P (value))
999 return void_type_node;
1001 DECL_IN_AGGR_P (value) = 1;
1010 /* Like `grokfield', but for bitfields.
1011 WIDTH is non-NULL for bit fields only, and is an INTEGER_CST node. */
1014 grokbitfield (const cp_declarator *declarator,
1015 cp_decl_specifier_seq *declspecs, tree width,
1018 tree value = grokdeclarator (declarator, declspecs, BITFIELD, 0, &attrlist);
1020 if (value == error_mark_node)
1021 return NULL_TREE; /* friends went bad. */
1023 /* Pass friendly classes back. */
1024 if (TREE_CODE (value) == VOID_TYPE)
1025 return void_type_node;
1027 if (!INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (TREE_TYPE (value))
1028 && (POINTER_TYPE_P (value)
1029 || !dependent_type_p (TREE_TYPE (value))))
1031 error ("bit-field %qD with non-integral type", value);
1032 return error_mark_node;
1035 if (TREE_CODE (value) == TYPE_DECL)
1037 error ("cannot declare %qD to be a bit-field type", value);
1041 /* Usually, finish_struct_1 catches bitfields with invalid types.
1042 But, in the case of bitfields with function type, we confuse
1043 ourselves into thinking they are member functions, so we must
1045 if (TREE_CODE (value) == FUNCTION_DECL)
1047 error ("cannot declare bit-field %qD with function type",
1052 if (DECL_IN_AGGR_P (value))
1054 error ("%qD is already defined in the class %qT", value,
1055 DECL_CONTEXT (value));
1056 return void_type_node;
1059 if (TREE_STATIC (value))
1061 error ("static member %qD cannot be a bit-field", value);
1064 cp_finish_decl (value, NULL_TREE, false, NULL_TREE, 0);
1066 if (width != error_mark_node)
1068 /* The width must be an integer type. */
1069 if (!type_dependent_expression_p (width)
1070 && !INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (TREE_TYPE (width)))
1071 error ("width of bit-field %qD has non-integral type %qT", value,
1073 DECL_INITIAL (value) = width;
1074 SET_DECL_C_BIT_FIELD (value);
1077 DECL_IN_AGGR_P (value) = 1;
1080 cplus_decl_attributes (&value, attrlist, /*flags=*/0);
1086 /* Returns true iff ATTR is an attribute which needs to be applied at
1087 instantiation time rather than template definition time. */
1090 is_late_template_attribute (tree attr, tree decl)
1092 tree name = TREE_PURPOSE (attr);
1093 tree args = TREE_VALUE (attr);
1094 const struct attribute_spec *spec = lookup_attribute_spec (name);
1098 /* Unknown attribute. */
1101 /* Attribute weak handling wants to write out assembly right away. */
1102 if (is_attribute_p ("weak", name))
1105 /* If any of the arguments are dependent expressions, we can't evaluate
1106 the attribute until instantiation time. */
1107 for (arg = args; arg; arg = TREE_CHAIN (arg))
1109 tree t = TREE_VALUE (arg);
1111 /* If the first attribute argument is an identifier, only consider
1112 second and following arguments. Attributes like mode, format,
1113 cleanup and several target specific attributes aren't late
1114 just because they have an IDENTIFIER_NODE as first argument. */
1115 if (arg == args && TREE_CODE (t) == IDENTIFIER_NODE)
1118 if (value_dependent_expression_p (t)
1119 || type_dependent_expression_p (t))
1123 if (TREE_CODE (decl) == TYPE_DECL
1125 || spec->type_required)
1127 tree type = TYPE_P (decl) ? decl : TREE_TYPE (decl);
1129 /* We can't apply any attributes to a completely unknown type until
1130 instantiation time. */
1131 enum tree_code code = TREE_CODE (type);
1132 if (code == TEMPLATE_TYPE_PARM
1133 || code == BOUND_TEMPLATE_TEMPLATE_PARM
1134 || code == TYPENAME_TYPE)
1136 /* Also defer most attributes on dependent types. This is not
1137 necessary in all cases, but is the better default. */
1138 else if (dependent_type_p (type)
1139 /* But attribute visibility specifically works on
1141 && !is_attribute_p ("visibility", name))
1150 /* ATTR_P is a list of attributes. Remove any attributes which need to be
1151 applied at instantiation time and return them. If IS_DEPENDENT is true,
1152 the declaration itself is dependent, so all attributes should be applied
1153 at instantiation time. */
1156 splice_template_attributes (tree *attr_p, tree decl)
1159 tree late_attrs = NULL_TREE;
1160 tree *q = &late_attrs;
1167 if (is_late_template_attribute (*p, decl))
1169 ATTR_IS_DEPENDENT (*p) = 1;
1171 *p = TREE_CHAIN (*p);
1172 q = &TREE_CHAIN (*q);
1176 p = &TREE_CHAIN (*p);
1182 /* Remove any late attributes from the list in ATTR_P and attach them to
1186 save_template_attributes (tree *attr_p, tree *decl_p)
1188 tree late_attrs = splice_template_attributes (attr_p, *decl_p);
1190 tree old_attrs = NULL_TREE;
1195 if (DECL_P (*decl_p))
1196 q = &DECL_ATTRIBUTES (*decl_p);
1198 q = &TYPE_ATTRIBUTES (*decl_p);
1202 /* Merge the late attributes at the beginning with the attribute
1204 late_attrs = merge_attributes (late_attrs, *q);
1207 if (!DECL_P (*decl_p) && *decl_p == TYPE_MAIN_VARIANT (*decl_p))
1209 /* We've added new attributes directly to the main variant, so
1210 now we need to update all of the other variants to include
1211 these new attributes. */
1213 for (variant = TYPE_NEXT_VARIANT (*decl_p); variant;
1214 variant = TYPE_NEXT_VARIANT (variant))
1216 gcc_assert (TYPE_ATTRIBUTES (variant) == old_attrs);
1217 TYPE_ATTRIBUTES (variant) = TYPE_ATTRIBUTES (*decl_p);
1222 /* Like reconstruct_complex_type, but handle also template trees. */
1225 cp_reconstruct_complex_type (tree type, tree bottom)
1229 if (TREE_CODE (type) == POINTER_TYPE)
1231 inner = cp_reconstruct_complex_type (TREE_TYPE (type), bottom);
1232 outer = build_pointer_type_for_mode (inner, TYPE_MODE (type),
1233 TYPE_REF_CAN_ALIAS_ALL (type));
1235 else if (TREE_CODE (type) == REFERENCE_TYPE)
1237 inner = cp_reconstruct_complex_type (TREE_TYPE (type), bottom);
1238 outer = build_reference_type_for_mode (inner, TYPE_MODE (type),
1239 TYPE_REF_CAN_ALIAS_ALL (type));
1241 else if (TREE_CODE (type) == ARRAY_TYPE)
1243 inner = cp_reconstruct_complex_type (TREE_TYPE (type), bottom);
1244 outer = build_cplus_array_type (inner, TYPE_DOMAIN (type));
1245 /* Don't call cp_build_qualified_type on ARRAY_TYPEs, the
1246 element type qualification will be handled by the recursive
1247 cp_reconstruct_complex_type call and cp_build_qualified_type
1248 for ARRAY_TYPEs changes the element type. */
1251 else if (TREE_CODE (type) == FUNCTION_TYPE)
1253 inner = cp_reconstruct_complex_type (TREE_TYPE (type), bottom);
1254 outer = build_function_type (inner, TYPE_ARG_TYPES (type));
1255 outer = apply_memfn_quals (outer, type_memfn_quals (type));
1257 else if (TREE_CODE (type) == METHOD_TYPE)
1259 inner = cp_reconstruct_complex_type (TREE_TYPE (type), bottom);
1260 /* The build_method_type_directly() routine prepends 'this' to argument list,
1261 so we must compensate by getting rid of it. */
1263 = build_method_type_directly
1264 (class_of_this_parm (type), inner,
1265 TREE_CHAIN (TYPE_ARG_TYPES (type)));
1267 else if (TREE_CODE (type) == OFFSET_TYPE)
1269 inner = cp_reconstruct_complex_type (TREE_TYPE (type), bottom);
1270 outer = build_offset_type (TYPE_OFFSET_BASETYPE (type), inner);
1275 if (TYPE_ATTRIBUTES (type))
1276 outer = cp_build_type_attribute_variant (outer, TYPE_ATTRIBUTES (type));
1277 return cp_build_qualified_type (outer, cp_type_quals (type));
1280 /* Replaces any constexpr expression that may be into the attributes
1281 arguments with their reduced value. */
1284 cp_check_const_attributes (tree attributes)
1287 for (attr = attributes; attr; attr = TREE_CHAIN (attr))
1290 for (arg = TREE_VALUE (attr); arg; arg = TREE_CHAIN (arg))
1292 tree expr = TREE_VALUE (arg);
1294 TREE_VALUE (arg) = maybe_constant_value (expr);
1299 /* Like decl_attributes, but handle C++ complexity. */
1302 cplus_decl_attributes (tree *decl, tree attributes, int flags)
1304 if (*decl == NULL_TREE || *decl == void_type_node
1305 || *decl == error_mark_node
1306 || attributes == NULL_TREE)
1309 if (processing_template_decl)
1311 if (check_for_bare_parameter_packs (attributes))
1314 save_template_attributes (&attributes, decl);
1315 if (attributes == NULL_TREE)
1319 cp_check_const_attributes (attributes);
1321 if (TREE_CODE (*decl) == TEMPLATE_DECL)
1322 decl = &DECL_TEMPLATE_RESULT (*decl);
1324 decl_attributes (decl, attributes, flags);
1326 if (TREE_CODE (*decl) == TYPE_DECL)
1327 SET_IDENTIFIER_TYPE_VALUE (DECL_NAME (*decl), TREE_TYPE (*decl));
1330 /* Walks through the namespace- or function-scope anonymous union
1331 OBJECT, with the indicated TYPE, building appropriate VAR_DECLs.
1332 Returns one of the fields for use in the mangled name. */
1335 build_anon_union_vars (tree type, tree object)
1337 tree main_decl = NULL_TREE;
1340 /* Rather than write the code to handle the non-union case,
1341 just give an error. */
1342 if (TREE_CODE (type) != UNION_TYPE)
1344 error ("anonymous struct not inside named type");
1345 return error_mark_node;
1348 for (field = TYPE_FIELDS (type);
1350 field = DECL_CHAIN (field))
1355 if (DECL_ARTIFICIAL (field))
1357 if (TREE_CODE (field) != FIELD_DECL)
1359 permerror (input_location, "%q+#D invalid; an anonymous union can only "
1360 "have non-static data members", field);
1364 if (TREE_PRIVATE (field))
1365 permerror (input_location, "private member %q+#D in anonymous union", field);
1366 else if (TREE_PROTECTED (field))
1367 permerror (input_location, "protected member %q+#D in anonymous union", field);
1369 if (processing_template_decl)
1370 ref = build_min_nt (COMPONENT_REF, object,
1371 DECL_NAME (field), NULL_TREE);
1373 ref = build_class_member_access_expr (object, field, NULL_TREE,
1374 false, tf_warning_or_error);
1376 if (DECL_NAME (field))
1380 decl = build_decl (input_location,
1381 VAR_DECL, DECL_NAME (field), TREE_TYPE (field));
1382 DECL_ANON_UNION_VAR_P (decl) = 1;
1383 DECL_ARTIFICIAL (decl) = 1;
1385 base = get_base_address (object);
1386 TREE_PUBLIC (decl) = TREE_PUBLIC (base);
1387 TREE_STATIC (decl) = TREE_STATIC (base);
1388 DECL_EXTERNAL (decl) = DECL_EXTERNAL (base);
1390 SET_DECL_VALUE_EXPR (decl, ref);
1391 DECL_HAS_VALUE_EXPR_P (decl) = 1;
1393 decl = pushdecl (decl);
1395 else if (ANON_AGGR_TYPE_P (TREE_TYPE (field)))
1396 decl = build_anon_union_vars (TREE_TYPE (field), ref);
1400 if (main_decl == NULL_TREE)
1407 /* Finish off the processing of a UNION_TYPE structure. If the union is an
1408 anonymous union, then all members must be laid out together. PUBLIC_P
1409 is nonzero if this union is not declared static. */
1412 finish_anon_union (tree anon_union_decl)
1418 if (anon_union_decl == error_mark_node)
1421 type = TREE_TYPE (anon_union_decl);
1422 public_p = TREE_PUBLIC (anon_union_decl);
1424 /* The VAR_DECL's context is the same as the TYPE's context. */
1425 DECL_CONTEXT (anon_union_decl) = DECL_CONTEXT (TYPE_NAME (type));
1427 if (TYPE_FIELDS (type) == NULL_TREE)
1432 error ("namespace-scope anonymous aggregates must be static");
1436 main_decl = build_anon_union_vars (type, anon_union_decl);
1437 if (main_decl == error_mark_node)
1439 if (main_decl == NULL_TREE)
1441 warning (0, "anonymous union with no members");
1445 if (!processing_template_decl)
1447 /* Use main_decl to set the mangled name. */
1448 DECL_NAME (anon_union_decl) = DECL_NAME (main_decl);
1449 maybe_commonize_var (anon_union_decl);
1450 if (TREE_STATIC (anon_union_decl) || DECL_EXTERNAL (anon_union_decl))
1451 mangle_decl (anon_union_decl);
1452 DECL_NAME (anon_union_decl) = NULL_TREE;
1455 pushdecl (anon_union_decl);
1456 if (building_stmt_list_p ()
1457 && at_function_scope_p ())
1458 add_decl_expr (anon_union_decl);
1459 else if (!processing_template_decl)
1460 rest_of_decl_compilation (anon_union_decl,
1461 toplevel_bindings_p (), at_eof);
1464 /* Auxiliary functions to make type signatures for
1465 `operator new' and `operator delete' correspond to
1466 what compiler will be expecting. */
1469 coerce_new_type (tree type)
1472 tree args = TYPE_ARG_TYPES (type);
1474 gcc_assert (TREE_CODE (type) == FUNCTION_TYPE);
1476 if (!same_type_p (TREE_TYPE (type), ptr_type_node))
1479 error ("%<operator new%> must return type %qT", ptr_type_node);
1482 if (args && args != void_list_node)
1484 if (TREE_PURPOSE (args))
1486 /* [basic.stc.dynamic.allocation]
1488 The first parameter shall not have an associated default
1490 error ("the first parameter of %<operator new%> cannot "
1491 "have a default argument");
1492 /* Throw away the default argument. */
1493 TREE_PURPOSE (args) = NULL_TREE;
1496 if (!same_type_p (TREE_VALUE (args), size_type_node))
1499 args = TREE_CHAIN (args);
1506 permerror (input_location, "%<operator new%> takes type %<size_t%> (%qT) "
1507 "as first parameter", size_type_node);
1512 args = tree_cons (NULL_TREE, size_type_node, args);
1515 type = build_exception_variant
1516 (build_function_type (ptr_type_node, args),
1517 TYPE_RAISES_EXCEPTIONS (type));
1525 coerce_delete_type (tree type)
1528 tree args = TYPE_ARG_TYPES (type);
1530 gcc_assert (TREE_CODE (type) == FUNCTION_TYPE);
1532 if (!same_type_p (TREE_TYPE (type), void_type_node))
1535 error ("%<operator delete%> must return type %qT", void_type_node);
1538 if (!args || args == void_list_node
1539 || !same_type_p (TREE_VALUE (args), ptr_type_node))
1542 if (args && args != void_list_node)
1543 args = TREE_CHAIN (args);
1544 error ("%<operator delete%> takes type %qT as first parameter",
1550 args = tree_cons (NULL_TREE, ptr_type_node, args);
1553 type = build_exception_variant
1554 (build_function_type (void_type_node, args),
1555 TYPE_RAISES_EXCEPTIONS (type));
1563 /* DECL is a VAR_DECL for a vtable: walk through the entries in the vtable
1564 and mark them as needed. */
1567 mark_vtable_entries (tree decl)
1570 unsigned HOST_WIDE_INT idx;
1572 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (DECL_INITIAL (decl)),
1577 STRIP_NOPS (fnaddr);
1579 if (TREE_CODE (fnaddr) != ADDR_EXPR
1580 && TREE_CODE (fnaddr) != FDESC_EXPR)
1581 /* This entry is an offset: a virtual base class offset, a
1582 virtual call offset, an RTTI offset, etc. */
1585 fn = TREE_OPERAND (fnaddr, 0);
1586 TREE_ADDRESSABLE (fn) = 1;
1587 /* When we don't have vcall offsets, we output thunks whenever
1588 we output the vtables that contain them. With vcall offsets,
1589 we know all the thunks we'll need when we emit a virtual
1590 function, so we emit the thunks there instead. */
1591 if (DECL_THUNK_P (fn))
1592 use_thunk (fn, /*emit_p=*/0);
1597 /* Set DECL up to have the closest approximation of "initialized common"
1598 linkage available. */
1601 comdat_linkage (tree decl)
1604 make_decl_one_only (decl, cxx_comdat_group (decl));
1605 else if (TREE_CODE (decl) == FUNCTION_DECL
1606 || (TREE_CODE (decl) == VAR_DECL && DECL_ARTIFICIAL (decl)))
1607 /* We can just emit function and compiler-generated variables
1608 statically; having multiple copies is (for the most part) only
1611 There are two correctness issues, however: the address of a
1612 template instantiation with external linkage should be the
1613 same, independent of what translation unit asks for the
1614 address, and this will not hold when we emit multiple copies of
1615 the function. However, there's little else we can do.
1617 Also, by default, the typeinfo implementation assumes that
1618 there will be only one copy of the string used as the name for
1619 each type. Therefore, if weak symbols are unavailable, the
1620 run-time library should perform a more conservative check; it
1621 should perform a string comparison, rather than an address
1623 TREE_PUBLIC (decl) = 0;
1626 /* Static data member template instantiations, however, cannot
1627 have multiple copies. */
1628 if (DECL_INITIAL (decl) == 0
1629 || DECL_INITIAL (decl) == error_mark_node)
1630 DECL_COMMON (decl) = 1;
1631 else if (EMPTY_CONSTRUCTOR_P (DECL_INITIAL (decl)))
1633 DECL_COMMON (decl) = 1;
1634 DECL_INITIAL (decl) = error_mark_node;
1636 else if (!DECL_EXPLICIT_INSTANTIATION (decl))
1638 /* We can't do anything useful; leave vars for explicit
1640 DECL_EXTERNAL (decl) = 1;
1641 DECL_NOT_REALLY_EXTERN (decl) = 0;
1645 DECL_COMDAT (decl) = 1;
1648 /* For win32 we also want to put explicit instantiations in
1649 linkonce sections, so that they will be merged with implicit
1650 instantiations; otherwise we get duplicate symbol errors.
1651 For Darwin we do not want explicit instantiations to be
1655 maybe_make_one_only (tree decl)
1657 /* We used to say that this was not necessary on targets that support weak
1658 symbols, because the implicit instantiations will defer to the explicit
1659 one. However, that's not actually the case in SVR4; a strong definition
1660 after a weak one is an error. Also, not making explicit
1661 instantiations one_only means that we can end up with two copies of
1662 some template instantiations. */
1666 /* We can't set DECL_COMDAT on functions, or cp_finish_file will think
1667 we can get away with not emitting them if they aren't used. We need
1668 to for variables so that cp_finish_decl will update their linkage,
1669 because their DECL_INITIAL may not have been set properly yet. */
1671 if (!TARGET_WEAK_NOT_IN_ARCHIVE_TOC
1672 || (! DECL_EXPLICIT_INSTANTIATION (decl)
1673 && ! DECL_TEMPLATE_SPECIALIZATION (decl)))
1675 make_decl_one_only (decl, cxx_comdat_group (decl));
1677 if (TREE_CODE (decl) == VAR_DECL)
1679 DECL_COMDAT (decl) = 1;
1680 /* Mark it needed so we don't forget to emit it. */
1681 mark_decl_referenced (decl);
1686 /* Returns true iff DECL, a FUNCTION_DECL or VAR_DECL, has vague linkage.
1687 This predicate will give the right answer during parsing of the
1688 function, which other tests may not. */
1691 vague_linkage_p (tree decl)
1693 /* Unfortunately, import_export_decl has not always been called
1694 before the function is processed, so we cannot simply check
1696 return (DECL_COMDAT (decl)
1697 || (((TREE_CODE (decl) == FUNCTION_DECL
1698 && DECL_DECLARED_INLINE_P (decl))
1699 || (DECL_LANG_SPECIFIC (decl)
1700 && DECL_TEMPLATE_INSTANTIATION (decl)))
1701 && TREE_PUBLIC (decl)));
1704 /* Determine whether or not we want to specifically import or export CTYPE,
1705 using various heuristics. */
1708 import_export_class (tree ctype)
1710 /* -1 for imported, 1 for exported. */
1711 int import_export = 0;
1713 /* It only makes sense to call this function at EOF. The reason is
1714 that this function looks at whether or not the first non-inline
1715 non-abstract virtual member function has been defined in this
1716 translation unit. But, we can't possibly know that until we've
1717 seen the entire translation unit. */
1718 gcc_assert (at_eof);
1720 if (CLASSTYPE_INTERFACE_KNOWN (ctype))
1723 /* If MULTIPLE_SYMBOL_SPACES is set and we saw a #pragma interface,
1724 we will have CLASSTYPE_INTERFACE_ONLY set but not
1725 CLASSTYPE_INTERFACE_KNOWN. In that case, we don't want to use this
1726 heuristic because someone will supply a #pragma implementation
1727 elsewhere, and deducing it here would produce a conflict. */
1728 if (CLASSTYPE_INTERFACE_ONLY (ctype))
1731 if (lookup_attribute ("dllimport", TYPE_ATTRIBUTES (ctype)))
1733 else if (lookup_attribute ("dllexport", TYPE_ATTRIBUTES (ctype)))
1735 else if (CLASSTYPE_IMPLICIT_INSTANTIATION (ctype)
1736 && !flag_implicit_templates)
1737 /* For a template class, without -fimplicit-templates, check the
1738 repository. If the virtual table is assigned to this
1739 translation unit, then export the class; otherwise, import
1741 import_export = repo_export_class_p (ctype) ? 1 : -1;
1742 else if (TYPE_POLYMORPHIC_P (ctype))
1744 /* The ABI specifies that the virtual table and associated
1745 information are emitted with the key method, if any. */
1746 tree method = CLASSTYPE_KEY_METHOD (ctype);
1747 /* If weak symbol support is not available, then we must be
1748 careful not to emit the vtable when the key function is
1749 inline. An inline function can be defined in multiple
1750 translation units. If we were to emit the vtable in each
1751 translation unit containing a definition, we would get
1752 multiple definition errors at link-time. */
1753 if (method && (flag_weak || ! DECL_DECLARED_INLINE_P (method)))
1754 import_export = (DECL_REALLY_EXTERN (method) ? -1 : 1);
1757 /* When MULTIPLE_SYMBOL_SPACES is set, we cannot count on seeing
1758 a definition anywhere else. */
1759 if (MULTIPLE_SYMBOL_SPACES && import_export == -1)
1762 /* Allow back ends the chance to overrule the decision. */
1763 if (targetm.cxx.import_export_class)
1764 import_export = targetm.cxx.import_export_class (ctype, import_export);
1768 SET_CLASSTYPE_INTERFACE_KNOWN (ctype);
1769 CLASSTYPE_INTERFACE_ONLY (ctype) = (import_export < 0);
1773 /* Return true if VAR has already been provided to the back end; in that
1774 case VAR should not be modified further by the front end. */
1776 var_finalized_p (tree var)
1778 return varpool_node (var)->finalized;
1781 /* DECL is a VAR_DECL or FUNCTION_DECL which, for whatever reason,
1782 must be emitted in this translation unit. Mark it as such. */
1785 mark_needed (tree decl)
1787 /* It's possible that we no longer need to set
1788 TREE_SYMBOL_REFERENCED here directly, but doing so is
1790 TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)) = 1;
1791 mark_decl_referenced (decl);
1794 /* DECL is either a FUNCTION_DECL or a VAR_DECL. This function
1795 returns true if a definition of this entity should be provided in
1796 this object file. Callers use this function to determine whether
1797 or not to let the back end know that a definition of DECL is
1798 available in this translation unit. */
1801 decl_needed_p (tree decl)
1803 gcc_assert (TREE_CODE (decl) == VAR_DECL
1804 || TREE_CODE (decl) == FUNCTION_DECL);
1805 /* This function should only be called at the end of the translation
1806 unit. We cannot be sure of whether or not something will be
1807 COMDAT until that point. */
1808 gcc_assert (at_eof);
1810 /* All entities with external linkage that are not COMDAT should be
1811 emitted; they may be referred to from other object files. */
1812 if (TREE_PUBLIC (decl) && !DECL_COMDAT (decl))
1814 /* If this entity was used, let the back end see it; it will decide
1815 whether or not to emit it into the object file. */
1816 if (TREE_USED (decl)
1817 || (DECL_ASSEMBLER_NAME_SET_P (decl)
1818 && TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))))
1820 /* Functions marked "dllexport" must be emitted so that they are
1821 visible to other DLLs. */
1822 if (flag_keep_inline_dllexport
1823 && lookup_attribute ("dllexport", DECL_ATTRIBUTES (decl)))
1825 /* Otherwise, DECL does not need to be emitted -- yet. A subsequent
1826 reference to DECL might cause it to be emitted later. */
1830 /* If necessary, write out the vtables for the dynamic class CTYPE.
1831 Returns true if any vtables were emitted. */
1834 maybe_emit_vtables (tree ctype)
1839 struct varpool_node *current = NULL, *last = NULL, *first = NULL;
1841 /* If the vtables for this class have already been emitted there is
1842 nothing more to do. */
1843 primary_vtbl = CLASSTYPE_VTABLES (ctype);
1844 if (var_finalized_p (primary_vtbl))
1846 /* Ignore dummy vtables made by get_vtable_decl. */
1847 if (TREE_TYPE (primary_vtbl) == void_type_node)
1850 /* On some targets, we cannot determine the key method until the end
1851 of the translation unit -- which is when this function is
1853 if (!targetm.cxx.key_method_may_be_inline ())
1854 determine_key_method (ctype);
1856 /* See if any of the vtables are needed. */
1857 for (vtbl = CLASSTYPE_VTABLES (ctype); vtbl; vtbl = DECL_CHAIN (vtbl))
1859 import_export_decl (vtbl);
1860 if (DECL_NOT_REALLY_EXTERN (vtbl) && decl_needed_p (vtbl))
1865 /* If the references to this class' vtables are optimized away,
1866 still emit the appropriate debugging information. See
1868 if (DECL_COMDAT (primary_vtbl)
1869 && CLASSTYPE_DEBUG_REQUESTED (ctype))
1870 note_debug_info_needed (ctype);
1874 /* The ABI requires that we emit all of the vtables if we emit any
1876 for (vtbl = CLASSTYPE_VTABLES (ctype); vtbl; vtbl = DECL_CHAIN (vtbl))
1878 /* Mark entities references from the virtual table as used. */
1879 mark_vtable_entries (vtbl);
1881 if (TREE_TYPE (DECL_INITIAL (vtbl)) == 0)
1883 VEC(tree,gc)* cleanups = NULL;
1884 tree expr = store_init_value (vtbl, DECL_INITIAL (vtbl), &cleanups,
1887 /* It had better be all done at compile-time. */
1888 gcc_assert (!expr && !cleanups);
1892 DECL_EXTERNAL (vtbl) = 0;
1893 rest_of_decl_compilation (vtbl, 1, 1);
1895 /* Because we're only doing syntax-checking, we'll never end up
1896 actually marking the variable as written. */
1897 if (flag_syntax_only)
1898 TREE_ASM_WRITTEN (vtbl) = 1;
1899 else if (DECL_COMDAT (vtbl))
1901 current = varpool_node (vtbl);
1903 last->same_comdat_group = current;
1911 last->same_comdat_group = first;
1913 /* Since we're writing out the vtable here, also write the debug
1915 note_debug_info_needed (ctype);
1920 /* A special return value from type_visibility meaning internal
1923 enum { VISIBILITY_ANON = VISIBILITY_INTERNAL+1 };
1925 /* walk_tree helper function for type_visibility. */
1928 min_vis_r (tree *tp, int *walk_subtrees, void *data)
1930 int *vis_p = (int *)data;
1935 else if (CLASS_TYPE_P (*tp))
1937 if (!TREE_PUBLIC (TYPE_MAIN_DECL (*tp)))
1939 *vis_p = VISIBILITY_ANON;
1942 else if (CLASSTYPE_VISIBILITY (*tp) > *vis_p)
1943 *vis_p = CLASSTYPE_VISIBILITY (*tp);
1948 /* Returns the visibility of TYPE, which is the minimum visibility of its
1952 type_visibility (tree type)
1954 int vis = VISIBILITY_DEFAULT;
1955 cp_walk_tree_without_duplicates (&type, min_vis_r, &vis);
1959 /* Limit the visibility of DECL to VISIBILITY, if not explicitly
1960 specified (or if VISIBILITY is static). If TMPL is true, this
1961 constraint is for a template argument, and takes precedence
1962 over explicitly-specified visibility on the template. */
1965 constrain_visibility (tree decl, int visibility, bool tmpl)
1967 if (visibility == VISIBILITY_ANON)
1969 /* extern "C" declarations aren't affected by the anonymous
1971 if (!DECL_EXTERN_C_P (decl))
1973 TREE_PUBLIC (decl) = 0;
1974 DECL_WEAK (decl) = 0;
1975 DECL_COMMON (decl) = 0;
1976 DECL_COMDAT_GROUP (decl) = NULL_TREE;
1977 DECL_INTERFACE_KNOWN (decl) = 1;
1978 if (DECL_LANG_SPECIFIC (decl))
1979 DECL_NOT_REALLY_EXTERN (decl) = 1;
1982 else if (visibility > DECL_VISIBILITY (decl)
1983 && (tmpl || !DECL_VISIBILITY_SPECIFIED (decl)))
1985 DECL_VISIBILITY (decl) = (enum symbol_visibility) visibility;
1986 /* This visibility was not specified. */
1987 DECL_VISIBILITY_SPECIFIED (decl) = false;
1991 /* Constrain the visibility of DECL based on the visibility of its template
1995 constrain_visibility_for_template (tree decl, tree targs)
1997 /* If this is a template instantiation, check the innermost
1998 template args for visibility constraints. The outer template
1999 args are covered by the class check. */
2000 tree args = INNERMOST_TEMPLATE_ARGS (targs);
2002 for (i = TREE_VEC_LENGTH (args); i > 0; --i)
2006 tree arg = TREE_VEC_ELT (args, i-1);
2008 vis = type_visibility (arg);
2009 else if (TREE_TYPE (arg) && POINTER_TYPE_P (TREE_TYPE (arg)))
2012 if (TREE_CODE (arg) == ADDR_EXPR)
2013 arg = TREE_OPERAND (arg, 0);
2014 if (TREE_CODE (arg) == VAR_DECL
2015 || TREE_CODE (arg) == FUNCTION_DECL)
2017 if (! TREE_PUBLIC (arg))
2018 vis = VISIBILITY_ANON;
2020 vis = DECL_VISIBILITY (arg);
2024 constrain_visibility (decl, vis, true);
2028 /* Like c_determine_visibility, but with additional C++-specific
2031 Function-scope entities can rely on the function's visibility because
2032 it is set in start_preparsed_function.
2034 Class-scope entities cannot rely on the class's visibility until the end
2035 of the enclosing class definition.
2037 Note that because namespaces have multiple independent definitions,
2038 namespace visibility is handled elsewhere using the #pragma visibility
2039 machinery rather than by decorating the namespace declaration.
2041 The goal is for constraints from the type to give a diagnostic, and
2042 other constraints to be applied silently. */
2045 determine_visibility (tree decl)
2047 tree class_type = NULL_TREE;
2049 bool orig_visibility_specified;
2050 enum symbol_visibility orig_visibility;
2052 /* Remember that all decls get VISIBILITY_DEFAULT when built. */
2054 /* Only relevant for names with external linkage. */
2055 if (!TREE_PUBLIC (decl))
2058 /* Cloned constructors and destructors get the same visibility as
2059 the underlying function. That should be set up in
2060 maybe_clone_body. */
2061 gcc_assert (!DECL_CLONED_FUNCTION_P (decl));
2063 orig_visibility_specified = DECL_VISIBILITY_SPECIFIED (decl);
2064 orig_visibility = DECL_VISIBILITY (decl);
2066 if (TREE_CODE (decl) == TYPE_DECL)
2068 if (CLASS_TYPE_P (TREE_TYPE (decl)))
2069 use_template = CLASSTYPE_USE_TEMPLATE (TREE_TYPE (decl));
2070 else if (TYPE_TEMPLATE_INFO (TREE_TYPE (decl)))
2075 else if (DECL_LANG_SPECIFIC (decl))
2076 use_template = DECL_USE_TEMPLATE (decl);
2080 /* If DECL is a member of a class, visibility specifiers on the
2081 class can influence the visibility of the DECL. */
2082 if (DECL_CLASS_SCOPE_P (decl))
2083 class_type = DECL_CONTEXT (decl);
2086 /* Not a class member. */
2088 /* Virtual tables have DECL_CONTEXT set to their associated class,
2089 so they are automatically handled above. */
2090 gcc_assert (TREE_CODE (decl) != VAR_DECL
2091 || !DECL_VTABLE_OR_VTT_P (decl));
2093 if (DECL_FUNCTION_SCOPE_P (decl) && ! DECL_VISIBILITY_SPECIFIED (decl))
2095 /* Local statics and classes get the visibility of their
2096 containing function by default, except that
2097 -fvisibility-inlines-hidden doesn't affect them. */
2098 tree fn = DECL_CONTEXT (decl);
2099 if (DECL_VISIBILITY_SPECIFIED (fn))
2101 DECL_VISIBILITY (decl) = DECL_VISIBILITY (fn);
2102 DECL_VISIBILITY_SPECIFIED (decl) =
2103 DECL_VISIBILITY_SPECIFIED (fn);
2107 if (DECL_CLASS_SCOPE_P (fn))
2108 determine_visibility_from_class (decl, DECL_CONTEXT (fn));
2109 else if (determine_hidden_inline (fn))
2111 DECL_VISIBILITY (decl) = default_visibility;
2112 DECL_VISIBILITY_SPECIFIED (decl) =
2113 visibility_options.inpragma;
2117 DECL_VISIBILITY (decl) = DECL_VISIBILITY (fn);
2118 DECL_VISIBILITY_SPECIFIED (decl) =
2119 DECL_VISIBILITY_SPECIFIED (fn);
2123 /* Local classes in templates have CLASSTYPE_USE_TEMPLATE set,
2124 but have no TEMPLATE_INFO, so don't try to check it. */
2127 else if (TREE_CODE (decl) == VAR_DECL && DECL_TINFO_P (decl)
2128 && flag_visibility_ms_compat)
2130 /* Under -fvisibility-ms-compat, types are visible by default,
2131 even though their contents aren't. */
2132 tree underlying_type = TREE_TYPE (DECL_NAME (decl));
2133 int underlying_vis = type_visibility (underlying_type);
2134 if (underlying_vis == VISIBILITY_ANON
2135 || (CLASS_TYPE_P (underlying_type)
2136 && CLASSTYPE_VISIBILITY_SPECIFIED (underlying_type)))
2137 constrain_visibility (decl, underlying_vis, false);
2139 DECL_VISIBILITY (decl) = VISIBILITY_DEFAULT;
2141 else if (TREE_CODE (decl) == VAR_DECL && DECL_TINFO_P (decl))
2143 /* tinfo visibility is based on the type it's for. */
2144 constrain_visibility
2145 (decl, type_visibility (TREE_TYPE (DECL_NAME (decl))), false);
2147 /* Give the target a chance to override the visibility associated
2149 if (TREE_PUBLIC (decl)
2150 && !DECL_REALLY_EXTERN (decl)
2151 && CLASS_TYPE_P (TREE_TYPE (DECL_NAME (decl)))
2152 && !CLASSTYPE_VISIBILITY_SPECIFIED (TREE_TYPE (DECL_NAME (decl))))
2153 targetm.cxx.determine_class_data_visibility (decl);
2155 else if (use_template)
2156 /* Template instantiations and specializations get visibility based
2157 on their template unless they override it with an attribute. */;
2158 else if (! DECL_VISIBILITY_SPECIFIED (decl))
2160 if (determine_hidden_inline (decl))
2161 DECL_VISIBILITY (decl) = VISIBILITY_HIDDEN;
2164 /* Set default visibility to whatever the user supplied with
2165 #pragma GCC visibility or a namespace visibility attribute. */
2166 DECL_VISIBILITY (decl) = default_visibility;
2167 DECL_VISIBILITY_SPECIFIED (decl) = visibility_options.inpragma;
2174 /* If the specialization doesn't specify visibility, use the
2175 visibility from the template. */
2176 tree tinfo = (TREE_CODE (decl) == TYPE_DECL
2177 ? TYPE_TEMPLATE_INFO (TREE_TYPE (decl))
2178 : DECL_TEMPLATE_INFO (decl));
2179 tree args = TI_ARGS (tinfo);
2180 tree attribs = (TREE_CODE (decl) == TYPE_DECL
2181 ? TYPE_ATTRIBUTES (TREE_TYPE (decl))
2182 : DECL_ATTRIBUTES (decl));
2184 if (args != error_mark_node
2185 /* Template argument visibility outweighs #pragma or namespace
2186 visibility, but not an explicit attribute. */
2187 && !lookup_attribute ("visibility", attribs))
2189 int depth = TMPL_ARGS_DEPTH (args);
2190 tree pattern = DECL_TEMPLATE_RESULT (TI_TEMPLATE (tinfo));
2192 if (!DECL_VISIBILITY_SPECIFIED (decl))
2194 if (!DECL_VISIBILITY_SPECIFIED (pattern)
2195 && determine_hidden_inline (decl))
2196 DECL_VISIBILITY (decl) = VISIBILITY_HIDDEN;
2199 DECL_VISIBILITY (decl) = DECL_VISIBILITY (pattern);
2200 DECL_VISIBILITY_SPECIFIED (decl)
2201 = DECL_VISIBILITY_SPECIFIED (pattern);
2205 /* FIXME should TMPL_ARGS_DEPTH really return 1 for null input? */
2206 if (args && depth > template_class_depth (class_type))
2207 /* Limit visibility based on its template arguments. */
2208 constrain_visibility_for_template (decl, args);
2213 determine_visibility_from_class (decl, class_type);
2215 if (decl_anon_ns_mem_p (decl))
2216 /* Names in an anonymous namespace get internal linkage.
2217 This might change once we implement export. */
2218 constrain_visibility (decl, VISIBILITY_ANON, false);
2219 else if (TREE_CODE (decl) != TYPE_DECL)
2221 /* Propagate anonymity from type to decl. */
2222 int tvis = type_visibility (TREE_TYPE (decl));
2223 if (tvis == VISIBILITY_ANON
2224 || ! DECL_VISIBILITY_SPECIFIED (decl))
2225 constrain_visibility (decl, tvis, false);
2227 else if (no_linkage_check (TREE_TYPE (decl), /*relaxed_p=*/true))
2228 /* DR 757: A type without linkage shall not be used as the type of a
2229 variable or function with linkage, unless
2230 o the variable or function has extern "C" linkage (7.5 [dcl.link]), or
2231 o the variable or function is not used (3.2 [basic.def.odr]) or is
2232 defined in the same translation unit.
2234 Since non-extern "C" decls need to be defined in the same
2235 translation unit, we can make the type internal. */
2236 constrain_visibility (decl, VISIBILITY_ANON, false);
2238 /* If visibility changed and DECL already has DECL_RTL, ensure
2239 symbol flags are updated. */
2240 if ((DECL_VISIBILITY (decl) != orig_visibility
2241 || DECL_VISIBILITY_SPECIFIED (decl) != orig_visibility_specified)
2242 && ((TREE_CODE (decl) == VAR_DECL && TREE_STATIC (decl))
2243 || TREE_CODE (decl) == FUNCTION_DECL)
2244 && DECL_RTL_SET_P (decl))
2245 make_decl_rtl (decl);
2248 /* By default, static data members and function members receive
2249 the visibility of their containing class. */
2252 determine_visibility_from_class (tree decl, tree class_type)
2254 if (DECL_VISIBILITY_SPECIFIED (decl))
2257 if (determine_hidden_inline (decl))
2258 DECL_VISIBILITY (decl) = VISIBILITY_HIDDEN;
2261 /* Default to the class visibility. */
2262 DECL_VISIBILITY (decl) = CLASSTYPE_VISIBILITY (class_type);
2263 DECL_VISIBILITY_SPECIFIED (decl)
2264 = CLASSTYPE_VISIBILITY_SPECIFIED (class_type);
2267 /* Give the target a chance to override the visibility associated
2269 if (TREE_CODE (decl) == VAR_DECL
2270 && (DECL_TINFO_P (decl)
2271 || (DECL_VTABLE_OR_VTT_P (decl)
2272 /* Construction virtual tables are not exported because
2273 they cannot be referred to from other object files;
2274 their name is not standardized by the ABI. */
2275 && !DECL_CONSTRUCTION_VTABLE_P (decl)))
2276 && TREE_PUBLIC (decl)
2277 && !DECL_REALLY_EXTERN (decl)
2278 && !CLASSTYPE_VISIBILITY_SPECIFIED (class_type))
2279 targetm.cxx.determine_class_data_visibility (decl);
2282 /* Returns true iff DECL is an inline that should get hidden visibility
2283 because of -fvisibility-inlines-hidden. */
2286 determine_hidden_inline (tree decl)
2288 return (visibility_options.inlines_hidden
2289 /* Don't do this for inline templates; specializations might not be
2290 inline, and we don't want them to inherit the hidden
2291 visibility. We'll set it here for all inline instantiations. */
2292 && !processing_template_decl
2293 && TREE_CODE (decl) == FUNCTION_DECL
2294 && DECL_DECLARED_INLINE_P (decl)
2295 && (! DECL_LANG_SPECIFIC (decl)
2296 || ! DECL_EXPLICIT_INSTANTIATION (decl)));
2299 /* Constrain the visibility of a class TYPE based on the visibility of its
2300 field types. Warn if any fields require lesser visibility. */
2303 constrain_class_visibility (tree type)
2309 int vis = type_visibility (type);
2311 if (vis == VISIBILITY_ANON
2312 || DECL_IN_SYSTEM_HEADER (TYPE_MAIN_DECL (type)))
2315 /* Don't warn about visibility if the class has explicit visibility. */
2316 if (CLASSTYPE_VISIBILITY_SPECIFIED (type))
2317 vis = VISIBILITY_INTERNAL;
2319 for (t = TYPE_FIELDS (type); t; t = DECL_CHAIN (t))
2320 if (TREE_CODE (t) == FIELD_DECL && TREE_TYPE (t) != error_mark_node)
2322 tree ftype = strip_pointer_or_array_types (TREE_TYPE (t));
2323 int subvis = type_visibility (ftype);
2325 if (subvis == VISIBILITY_ANON)
2327 if (!in_main_input_context ())
2329 %qT has a field %qD whose type uses the anonymous namespace",
2332 else if (MAYBE_CLASS_TYPE_P (ftype)
2333 && vis < VISIBILITY_HIDDEN
2334 && subvis >= VISIBILITY_HIDDEN)
2335 warning (OPT_Wattributes, "\
2336 %qT declared with greater visibility than the type of its field %qD",
2340 binfo = TYPE_BINFO (type);
2341 for (i = 0; BINFO_BASE_ITERATE (binfo, i, t); ++i)
2343 int subvis = type_visibility (TREE_TYPE (t));
2345 if (subvis == VISIBILITY_ANON)
2347 if (!in_main_input_context())
2349 %qT has a base %qT whose type uses the anonymous namespace",
2350 type, TREE_TYPE (t));
2352 else if (vis < VISIBILITY_HIDDEN
2353 && subvis >= VISIBILITY_HIDDEN)
2354 warning (OPT_Wattributes, "\
2355 %qT declared with greater visibility than its base %qT",
2356 type, TREE_TYPE (t));
2360 /* DECL is a FUNCTION_DECL or VAR_DECL. If the object file linkage
2361 for DECL has not already been determined, do so now by setting
2362 DECL_EXTERNAL, DECL_COMDAT and other related flags. Until this
2363 function is called entities with vague linkage whose definitions
2364 are available must have TREE_PUBLIC set.
2366 If this function decides to place DECL in COMDAT, it will set
2367 appropriate flags -- but will not clear DECL_EXTERNAL. It is up to
2368 the caller to decide whether or not to clear DECL_EXTERNAL. Some
2369 callers defer that decision until it is clear that DECL is actually
2373 import_export_decl (tree decl)
2378 tree class_type = NULL_TREE;
2380 if (DECL_INTERFACE_KNOWN (decl))
2383 /* We cannot determine what linkage to give to an entity with vague
2384 linkage until the end of the file. For example, a virtual table
2385 for a class will be defined if and only if the key method is
2386 defined in this translation unit. As a further example, consider
2387 that when compiling a translation unit that uses PCH file with
2388 "-frepo" it would be incorrect to make decisions about what
2389 entities to emit when building the PCH; those decisions must be
2390 delayed until the repository information has been processed. */
2391 gcc_assert (at_eof);
2392 /* Object file linkage for explicit instantiations is handled in
2393 mark_decl_instantiated. For static variables in functions with
2394 vague linkage, maybe_commonize_var is used.
2396 Therefore, the only declarations that should be provided to this
2397 function are those with external linkage that are:
2399 * implicit instantiations of function templates
2403 * implicit instantiations of static data members of class
2410 Furthermore, all entities that reach this point must have a
2411 definition available in this translation unit.
2413 The following assertions check these conditions. */
2414 gcc_assert (TREE_CODE (decl) == FUNCTION_DECL
2415 || TREE_CODE (decl) == VAR_DECL);
2416 /* Any code that creates entities with TREE_PUBLIC cleared should
2417 also set DECL_INTERFACE_KNOWN. */
2418 gcc_assert (TREE_PUBLIC (decl));
2419 if (TREE_CODE (decl) == FUNCTION_DECL)
2420 gcc_assert (DECL_IMPLICIT_INSTANTIATION (decl)
2421 || DECL_FRIEND_PSEUDO_TEMPLATE_INSTANTIATION (decl)
2422 || DECL_DECLARED_INLINE_P (decl));
2424 gcc_assert (DECL_IMPLICIT_INSTANTIATION (decl)
2425 || DECL_VTABLE_OR_VTT_P (decl)
2426 || DECL_TINFO_P (decl));
2427 /* Check that a definition of DECL is available in this translation
2429 gcc_assert (!DECL_REALLY_EXTERN (decl));
2431 /* Assume that DECL will not have COMDAT linkage. */
2433 /* Assume that DECL will not be imported into this translation
2437 /* See if the repository tells us whether or not to emit DECL in
2438 this translation unit. */
2439 emit_p = repo_emit_p (decl);
2442 else if (emit_p == 1)
2444 /* The repository indicates that this entity should be defined
2445 here. Make sure the back end honors that request. */
2446 if (TREE_CODE (decl) == VAR_DECL)
2448 else if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (decl)
2449 || DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P (decl))
2452 FOR_EACH_CLONE (clone, decl)
2453 mark_needed (clone);
2457 /* Output the definition as an ordinary strong definition. */
2458 DECL_EXTERNAL (decl) = 0;
2459 DECL_INTERFACE_KNOWN (decl) = 1;
2464 /* We have already decided what to do with this DECL; there is no
2465 need to check anything further. */
2467 else if (TREE_CODE (decl) == VAR_DECL && DECL_VTABLE_OR_VTT_P (decl))
2469 class_type = DECL_CONTEXT (decl);
2470 import_export_class (class_type);
2471 if (TYPE_FOR_JAVA (class_type))
2473 else if (CLASSTYPE_INTERFACE_KNOWN (class_type)
2474 && CLASSTYPE_INTERFACE_ONLY (class_type))
2476 else if ((!flag_weak || TARGET_WEAK_NOT_IN_ARCHIVE_TOC)
2477 && !CLASSTYPE_USE_TEMPLATE (class_type)
2478 && CLASSTYPE_KEY_METHOD (class_type)
2479 && !DECL_DECLARED_INLINE_P (CLASSTYPE_KEY_METHOD (class_type)))
2480 /* The ABI requires that all virtual tables be emitted with
2481 COMDAT linkage. However, on systems where COMDAT symbols
2482 don't show up in the table of contents for a static
2483 archive, or on systems without weak symbols (where we
2484 approximate COMDAT linkage by using internal linkage), the
2485 linker will report errors about undefined symbols because
2486 it will not see the virtual table definition. Therefore,
2487 in the case that we know that the virtual table will be
2488 emitted in only one translation unit, we make the virtual
2489 table an ordinary definition with external linkage. */
2490 DECL_EXTERNAL (decl) = 0;
2491 else if (CLASSTYPE_INTERFACE_KNOWN (class_type))
2493 /* CLASS_TYPE is being exported from this translation unit,
2494 so DECL should be defined here. */
2495 if (!flag_weak && CLASSTYPE_EXPLICIT_INSTANTIATION (class_type))
2496 /* If a class is declared in a header with the "extern
2497 template" extension, then it will not be instantiated,
2498 even in translation units that would normally require
2499 it. Often such classes are explicitly instantiated in
2500 one translation unit. Therefore, the explicit
2501 instantiation must be made visible to other translation
2503 DECL_EXTERNAL (decl) = 0;
2506 /* The generic C++ ABI says that class data is always
2507 COMDAT, even if there is a key function. Some
2508 variants (e.g., the ARM EABI) says that class data
2509 only has COMDAT linkage if the class data might be
2510 emitted in more than one translation unit. When the
2511 key method can be inline and is inline, we still have
2512 to arrange for comdat even though
2513 class_data_always_comdat is false. */
2514 if (!CLASSTYPE_KEY_METHOD (class_type)
2515 || DECL_DECLARED_INLINE_P (CLASSTYPE_KEY_METHOD (class_type))
2516 || targetm.cxx.class_data_always_comdat ())
2518 /* The ABI requires COMDAT linkage. Normally, we
2519 only emit COMDAT things when they are needed;
2520 make sure that we realize that this entity is
2527 else if (!flag_implicit_templates
2528 && CLASSTYPE_IMPLICIT_INSTANTIATION (class_type))
2533 else if (TREE_CODE (decl) == VAR_DECL && DECL_TINFO_P (decl))
2535 tree type = TREE_TYPE (DECL_NAME (decl));
2536 if (CLASS_TYPE_P (type))
2539 import_export_class (type);
2540 if (CLASSTYPE_INTERFACE_KNOWN (type)
2541 && TYPE_POLYMORPHIC_P (type)
2542 && CLASSTYPE_INTERFACE_ONLY (type)
2543 /* If -fno-rtti was specified, then we cannot be sure
2544 that RTTI information will be emitted with the
2545 virtual table of the class, so we must emit it
2546 wherever it is used. */
2551 if (CLASSTYPE_INTERFACE_KNOWN (type)
2552 && !CLASSTYPE_INTERFACE_ONLY (type))
2554 comdat_p = (targetm.cxx.class_data_always_comdat ()
2555 || (CLASSTYPE_KEY_METHOD (type)
2556 && DECL_DECLARED_INLINE_P (CLASSTYPE_KEY_METHOD (type))));
2561 DECL_EXTERNAL (decl) = 0;
2571 else if (DECL_TEMPLATE_INSTANTIATION (decl)
2572 || DECL_FRIEND_PSEUDO_TEMPLATE_INSTANTIATION (decl))
2574 /* DECL is an implicit instantiation of a function or static
2576 if ((flag_implicit_templates
2577 && !flag_use_repository)
2578 || (flag_implicit_inline_templates
2579 && TREE_CODE (decl) == FUNCTION_DECL
2580 && DECL_DECLARED_INLINE_P (decl)))
2583 /* If we are not implicitly generating templates, then mark
2584 this entity as undefined in this translation unit. */
2587 else if (DECL_FUNCTION_MEMBER_P (decl))
2589 if (!DECL_DECLARED_INLINE_P (decl))
2591 tree ctype = DECL_CONTEXT (decl);
2592 import_export_class (ctype);
2593 if (CLASSTYPE_INTERFACE_KNOWN (ctype))
2595 DECL_NOT_REALLY_EXTERN (decl)
2596 = ! (CLASSTYPE_INTERFACE_ONLY (ctype)
2597 || (DECL_DECLARED_INLINE_P (decl)
2598 && ! flag_implement_inlines
2599 && !DECL_VINDEX (decl)));
2601 if (!DECL_NOT_REALLY_EXTERN (decl))
2602 DECL_EXTERNAL (decl) = 1;
2604 /* Always make artificials weak. */
2605 if (DECL_ARTIFICIAL (decl) && flag_weak)
2608 maybe_make_one_only (decl);
2619 /* If we are importing DECL into this translation unit, mark is
2620 an undefined here. */
2621 DECL_EXTERNAL (decl) = 1;
2622 DECL_NOT_REALLY_EXTERN (decl) = 0;
2626 /* If we decided to put DECL in COMDAT, mark it accordingly at
2628 comdat_linkage (decl);
2631 DECL_INTERFACE_KNOWN (decl) = 1;
2634 /* Return an expression that performs the destruction of DECL, which
2635 must be a VAR_DECL whose type has a non-trivial destructor, or is
2636 an array whose (innermost) elements have a non-trivial destructor. */
2639 build_cleanup (tree decl)
2642 tree type = TREE_TYPE (decl);
2644 /* This function should only be called for declarations that really
2645 require cleanups. */
2646 gcc_assert (!TYPE_HAS_TRIVIAL_DESTRUCTOR (type));
2648 /* Treat all objects with destructors as used; the destructor may do
2649 something substantive. */
2652 if (TREE_CODE (type) == ARRAY_TYPE)
2655 temp = build_address (decl);
2656 temp = build_delete (TREE_TYPE (temp), temp,
2657 sfk_complete_destructor,
2658 LOOKUP_NORMAL|LOOKUP_NONVIRTUAL|LOOKUP_DESTRUCTOR, 0,
2659 tf_warning_or_error);
2663 /* Returns the initialization guard variable for the variable DECL,
2664 which has static storage duration. */
2667 get_guard (tree decl)
2672 sname = mangle_guard_variable (decl);
2673 guard = IDENTIFIER_GLOBAL_VALUE (sname);
2678 /* We use a type that is big enough to contain a mutex as well
2679 as an integer counter. */
2680 guard_type = targetm.cxx.guard_type ();
2681 guard = build_decl (DECL_SOURCE_LOCATION (decl),
2682 VAR_DECL, sname, guard_type);
2684 /* The guard should have the same linkage as what it guards. */
2685 TREE_PUBLIC (guard) = TREE_PUBLIC (decl);
2686 TREE_STATIC (guard) = TREE_STATIC (decl);
2687 DECL_COMMON (guard) = DECL_COMMON (decl);
2688 DECL_COMDAT (guard) = DECL_COMDAT (decl);
2689 if (DECL_ONE_ONLY (decl))
2690 make_decl_one_only (guard, cxx_comdat_group (guard));
2691 if (TREE_PUBLIC (decl))
2692 DECL_WEAK (guard) = DECL_WEAK (decl);
2693 DECL_VISIBILITY (guard) = DECL_VISIBILITY (decl);
2694 DECL_VISIBILITY_SPECIFIED (guard) = DECL_VISIBILITY_SPECIFIED (decl);
2696 DECL_ARTIFICIAL (guard) = 1;
2697 DECL_IGNORED_P (guard) = 1;
2698 TREE_USED (guard) = 1;
2699 pushdecl_top_level_and_finish (guard, NULL_TREE);
2704 /* Return those bits of the GUARD variable that should be set when the
2705 guarded entity is actually initialized. */
2708 get_guard_bits (tree guard)
2710 if (!targetm.cxx.guard_mask_bit ())
2712 /* We only set the first byte of the guard, in order to leave room
2713 for a mutex in the high-order bits. */
2714 guard = build1 (ADDR_EXPR,
2715 build_pointer_type (TREE_TYPE (guard)),
2717 guard = build1 (NOP_EXPR,
2718 build_pointer_type (char_type_node),
2720 guard = build1 (INDIRECT_REF, char_type_node, guard);
2726 /* Return an expression which determines whether or not the GUARD
2727 variable has already been initialized. */
2730 get_guard_cond (tree guard)
2734 /* Check to see if the GUARD is zero. */
2735 guard = get_guard_bits (guard);
2737 /* Mask off all but the low bit. */
2738 if (targetm.cxx.guard_mask_bit ())
2740 guard_value = integer_one_node;
2741 if (!same_type_p (TREE_TYPE (guard_value), TREE_TYPE (guard)))
2742 guard_value = convert (TREE_TYPE (guard), guard_value);
2743 guard = cp_build_binary_op (input_location,
2744 BIT_AND_EXPR, guard, guard_value,
2745 tf_warning_or_error);
2748 guard_value = integer_zero_node;
2749 if (!same_type_p (TREE_TYPE (guard_value), TREE_TYPE (guard)))
2750 guard_value = convert (TREE_TYPE (guard), guard_value);
2751 return cp_build_binary_op (input_location,
2752 EQ_EXPR, guard, guard_value,
2753 tf_warning_or_error);
2756 /* Return an expression which sets the GUARD variable, indicating that
2757 the variable being guarded has been initialized. */
2760 set_guard (tree guard)
2764 /* Set the GUARD to one. */
2765 guard = get_guard_bits (guard);
2766 guard_init = integer_one_node;
2767 if (!same_type_p (TREE_TYPE (guard_init), TREE_TYPE (guard)))
2768 guard_init = convert (TREE_TYPE (guard), guard_init);
2769 return cp_build_modify_expr (guard, NOP_EXPR, guard_init,
2770 tf_warning_or_error);
2773 /* Start the process of running a particular set of global constructors
2774 or destructors. Subroutine of do_[cd]tors. */
2777 start_objects (int method_type, int initp)
2783 /* Make ctor or dtor function. METHOD_TYPE may be 'I' or 'D'. */
2785 if (initp != DEFAULT_INIT_PRIORITY)
2795 sprintf (type, "sub_%c%c%.5u", method_type, joiner, initp);
2798 sprintf (type, "sub_%c", method_type);
2800 fndecl = build_lang_decl (FUNCTION_DECL,
2801 get_file_function_name (type),
2802 build_function_type_list (void_type_node,
2804 start_preparsed_function (fndecl, /*attrs=*/NULL_TREE, SF_PRE_PARSED);
2806 TREE_PUBLIC (current_function_decl) = 0;
2808 /* Mark as artificial because it's not explicitly in the user's
2810 DECL_ARTIFICIAL (current_function_decl) = 1;
2812 /* Mark this declaration as used to avoid spurious warnings. */
2813 TREE_USED (current_function_decl) = 1;
2815 /* Mark this function as a global constructor or destructor. */
2816 if (method_type == 'I')
2817 DECL_GLOBAL_CTOR_P (current_function_decl) = 1;
2819 DECL_GLOBAL_DTOR_P (current_function_decl) = 1;
2821 body = begin_compound_stmt (BCS_FN_BODY);
2826 /* Finish the process of running a particular set of global constructors
2827 or destructors. Subroutine of do_[cd]tors. */
2830 finish_objects (int method_type, int initp, tree body)
2835 finish_compound_stmt (body);
2836 fn = finish_function (0);
2838 if (method_type == 'I')
2840 DECL_STATIC_CONSTRUCTOR (fn) = 1;
2841 decl_init_priority_insert (fn, initp);
2845 DECL_STATIC_DESTRUCTOR (fn) = 1;
2846 decl_fini_priority_insert (fn, initp);
2849 expand_or_defer_fn (fn);
2852 /* The names of the parameters to the function created to handle
2853 initializations and destructions for objects with static storage
2855 #define INITIALIZE_P_IDENTIFIER "__initialize_p"
2856 #define PRIORITY_IDENTIFIER "__priority"
2858 /* The name of the function we create to handle initializations and
2859 destructions for objects with static storage duration. */
2860 #define SSDF_IDENTIFIER "__static_initialization_and_destruction"
2862 /* The declaration for the __INITIALIZE_P argument. */
2863 static GTY(()) tree initialize_p_decl;
2865 /* The declaration for the __PRIORITY argument. */
2866 static GTY(()) tree priority_decl;
2868 /* The declaration for the static storage duration function. */
2869 static GTY(()) tree ssdf_decl;
2871 /* All the static storage duration functions created in this
2872 translation unit. */
2873 static GTY(()) VEC(tree,gc) *ssdf_decls;
2875 /* A map from priority levels to information about that priority
2876 level. There may be many such levels, so efficient lookup is
2878 static splay_tree priority_info_map;
2880 /* Begins the generation of the function that will handle all
2881 initialization and destruction of objects with static storage
2882 duration. The function generated takes two parameters of type
2883 `int': __INITIALIZE_P and __PRIORITY. If __INITIALIZE_P is
2884 nonzero, it performs initializations. Otherwise, it performs
2885 destructions. It only performs those initializations or
2886 destructions with the indicated __PRIORITY. The generated function
2889 It is assumed that this function will only be called once per
2890 translation unit. */
2893 start_static_storage_duration_function (unsigned count)
2897 char id[sizeof (SSDF_IDENTIFIER) + 1 /* '\0' */ + 32];
2899 /* Create the identifier for this function. It will be of the form
2900 SSDF_IDENTIFIER_<number>. */
2901 sprintf (id, "%s_%u", SSDF_IDENTIFIER, count);
2903 type = build_function_type_list (void_type_node,
2904 integer_type_node, integer_type_node,
2907 /* Create the FUNCTION_DECL itself. */
2908 ssdf_decl = build_lang_decl (FUNCTION_DECL,
2909 get_identifier (id),
2911 TREE_PUBLIC (ssdf_decl) = 0;
2912 DECL_ARTIFICIAL (ssdf_decl) = 1;
2914 /* Put this function in the list of functions to be called from the
2915 static constructors and destructors. */
2918 ssdf_decls = VEC_alloc (tree, gc, 32);
2920 /* Take this opportunity to initialize the map from priority
2921 numbers to information about that priority level. */
2922 priority_info_map = splay_tree_new (splay_tree_compare_ints,
2923 /*delete_key_fn=*/0,
2924 /*delete_value_fn=*/
2925 (splay_tree_delete_value_fn) &free);
2927 /* We always need to generate functions for the
2928 DEFAULT_INIT_PRIORITY so enter it now. That way when we walk
2929 priorities later, we'll be sure to find the
2930 DEFAULT_INIT_PRIORITY. */
2931 get_priority_info (DEFAULT_INIT_PRIORITY);
2934 VEC_safe_push (tree, gc, ssdf_decls, ssdf_decl);
2936 /* Create the argument list. */
2937 initialize_p_decl = cp_build_parm_decl
2938 (get_identifier (INITIALIZE_P_IDENTIFIER), integer_type_node);
2939 DECL_CONTEXT (initialize_p_decl) = ssdf_decl;
2940 TREE_USED (initialize_p_decl) = 1;
2941 priority_decl = cp_build_parm_decl
2942 (get_identifier (PRIORITY_IDENTIFIER), integer_type_node);
2943 DECL_CONTEXT (priority_decl) = ssdf_decl;
2944 TREE_USED (priority_decl) = 1;
2946 DECL_CHAIN (initialize_p_decl) = priority_decl;
2947 DECL_ARGUMENTS (ssdf_decl) = initialize_p_decl;
2949 /* Put the function in the global scope. */
2950 pushdecl (ssdf_decl);
2952 /* Start the function itself. This is equivalent to declaring the
2955 static void __ssdf (int __initialize_p, init __priority_p);
2957 It is static because we only need to call this function from the
2958 various constructor and destructor functions for this module. */
2959 start_preparsed_function (ssdf_decl,
2960 /*attrs=*/NULL_TREE,
2963 /* Set up the scope of the outermost block in the function. */
2964 body = begin_compound_stmt (BCS_FN_BODY);
2969 /* Finish the generation of the function which performs initialization
2970 and destruction of objects with static storage duration. After
2971 this point, no more such objects can be created. */
2974 finish_static_storage_duration_function (tree body)
2976 /* Close out the function. */
2977 finish_compound_stmt (body);
2978 expand_or_defer_fn (finish_function (0));
2981 /* Return the information about the indicated PRIORITY level. If no
2982 code to handle this level has yet been generated, generate the
2983 appropriate prologue. */
2985 static priority_info
2986 get_priority_info (int priority)
2991 n = splay_tree_lookup (priority_info_map,
2992 (splay_tree_key) priority);
2995 /* Create a new priority information structure, and insert it
2997 pi = XNEW (struct priority_info_s);
2998 pi->initializations_p = 0;
2999 pi->destructions_p = 0;
3000 splay_tree_insert (priority_info_map,
3001 (splay_tree_key) priority,
3002 (splay_tree_value) pi);
3005 pi = (priority_info) n->value;
3010 /* The effective initialization priority of a DECL. */
3012 #define DECL_EFFECTIVE_INIT_PRIORITY(decl) \
3013 ((!DECL_HAS_INIT_PRIORITY_P (decl) || DECL_INIT_PRIORITY (decl) == 0) \
3014 ? DEFAULT_INIT_PRIORITY : DECL_INIT_PRIORITY (decl))
3016 /* Whether a DECL needs a guard to protect it against multiple
3019 #define NEEDS_GUARD_P(decl) (TREE_PUBLIC (decl) && (DECL_COMMON (decl) \
3020 || DECL_ONE_ONLY (decl) \
3021 || DECL_WEAK (decl)))
3023 /* Called from one_static_initialization_or_destruction(),
3025 Walks the initializer list of a global variable and looks for
3026 temporary variables (DECL_NAME() == NULL and DECL_ARTIFICIAL != 0)
3027 and that have their DECL_CONTEXT() == NULL.
3028 For each such temporary variable, set their DECL_CONTEXT() to
3029 the current function. This is necessary because otherwise
3030 some optimizers (enabled by -O2 -fprofile-arcs) might crash
3031 when trying to refer to a temporary variable that does not have
3032 it's DECL_CONTECT() properly set. */
3034 fix_temporary_vars_context_r (tree *node,
3035 int *unused ATTRIBUTE_UNUSED,
3036 void *unused1 ATTRIBUTE_UNUSED)
3038 gcc_assert (current_function_decl);
3040 if (TREE_CODE (*node) == BIND_EXPR)
3044 for (var = BIND_EXPR_VARS (*node); var; var = DECL_CHAIN (var))
3045 if (TREE_CODE (var) == VAR_DECL
3047 && DECL_ARTIFICIAL (var)
3048 && !DECL_CONTEXT (var))
3049 DECL_CONTEXT (var) = current_function_decl;
3055 /* Set up to handle the initialization or destruction of DECL. If
3056 INITP is nonzero, we are initializing the variable. Otherwise, we
3057 are destroying it. */
3060 one_static_initialization_or_destruction (tree decl, tree init, bool initp)
3062 tree guard_if_stmt = NULL_TREE;
3065 /* If we are supposed to destruct and there's a trivial destructor,
3066 nothing has to be done. */
3068 && TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
3071 /* Trick the compiler into thinking we are at the file and line
3072 where DECL was declared so that error-messages make sense, and so
3073 that the debugger will show somewhat sensible file and line
3075 input_location = DECL_SOURCE_LOCATION (decl);
3077 /* Make sure temporary variables in the initialiser all have
3078 their DECL_CONTEXT() set to a value different from NULL_TREE.
3079 This can happen when global variables initialisers are built.
3080 In that case, the DECL_CONTEXT() of the global variables _AND_ of all
3081 the temporary variables that might have been generated in the
3082 accompagning initialisers is NULL_TREE, meaning the variables have been
3083 declared in the global namespace.
3084 What we want to do here is to fix that and make sure the DECL_CONTEXT()
3085 of the temporaries are set to the current function decl. */
3086 cp_walk_tree_without_duplicates (&init,
3087 fix_temporary_vars_context_r,
3094 Access control for implicit calls to the constructors,
3095 the conversion functions, or the destructor called to
3096 create and destroy a static data member is performed as
3097 if these calls appeared in the scope of the member's
3100 we pretend we are in a static member function of the class of
3101 which the DECL is a member. */
3102 if (member_p (decl))
3104 DECL_CONTEXT (current_function_decl) = DECL_CONTEXT (decl);
3105 DECL_STATIC_FUNCTION_P (current_function_decl) = 1;
3108 /* Assume we don't need a guard. */
3110 /* We need a guard if this is an object with external linkage that
3111 might be initialized in more than one place. (For example, a
3112 static data member of a template, when the data member requires
3114 if (NEEDS_GUARD_P (decl))
3118 guard = get_guard (decl);
3120 /* When using __cxa_atexit, we just check the GUARD as we would
3121 for a local static. */
3122 if (flag_use_cxa_atexit)
3124 /* When using __cxa_atexit, we never try to destroy
3125 anything from a static destructor. */
3127 guard_cond = get_guard_cond (guard);
3129 /* If we don't have __cxa_atexit, then we will be running
3130 destructors from .fini sections, or their equivalents. So,
3131 we need to know how many times we've tried to initialize this
3132 object. We do initializations only if the GUARD is zero,
3133 i.e., if we are the first to initialize the variable. We do
3134 destructions only if the GUARD is one, i.e., if we are the
3135 last to destroy the variable. */
3138 = cp_build_binary_op (input_location,
3140 cp_build_unary_op (PREINCREMENT_EXPR,
3143 tf_warning_or_error),
3145 tf_warning_or_error);
3148 = cp_build_binary_op (input_location,
3150 cp_build_unary_op (PREDECREMENT_EXPR,
3153 tf_warning_or_error),
3155 tf_warning_or_error);
3157 guard_if_stmt = begin_if_stmt ();
3158 finish_if_stmt_cond (guard_cond, guard_if_stmt);
3162 /* If we're using __cxa_atexit, we have not already set the GUARD,
3163 so we must do so now. */
3164 if (guard && initp && flag_use_cxa_atexit)
3165 finish_expr_stmt (set_guard (guard));
3167 /* Perform the initialization or destruction. */
3171 finish_expr_stmt (init);
3173 /* If we're using __cxa_atexit, register a function that calls the
3174 destructor for the object. */
3175 if (flag_use_cxa_atexit)
3176 finish_expr_stmt (register_dtor_fn (decl));
3179 finish_expr_stmt (build_cleanup (decl));
3181 /* Finish the guard if-stmt, if necessary. */
3184 finish_then_clause (guard_if_stmt);
3185 finish_if_stmt (guard_if_stmt);
3188 /* Now that we're done with DECL we don't need to pretend to be a
3189 member of its class any longer. */
3190 DECL_CONTEXT (current_function_decl) = NULL_TREE;
3191 DECL_STATIC_FUNCTION_P (current_function_decl) = 0;
3194 /* Generate code to do the initialization or destruction of the decls in VARS,
3195 a TREE_LIST of VAR_DECL with static storage duration.
3196 Whether initialization or destruction is performed is specified by INITP. */
3199 do_static_initialization_or_destruction (tree vars, bool initp)
3201 tree node, init_if_stmt, cond;
3203 /* Build the outer if-stmt to check for initialization or destruction. */
3204 init_if_stmt = begin_if_stmt ();
3205 cond = initp ? integer_one_node : integer_zero_node;
3206 cond = cp_build_binary_op (input_location,
3210 tf_warning_or_error);
3211 finish_if_stmt_cond (cond, init_if_stmt);
3215 tree decl = TREE_VALUE (node);
3216 tree priority_if_stmt;
3220 /* If we don't need a destructor, there's nothing to do. Avoid
3221 creating a possibly empty if-stmt. */
3222 if (!initp && TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
3224 node = TREE_CHAIN (node);
3228 /* Remember that we had an initialization or finalization at this
3230 priority = DECL_EFFECTIVE_INIT_PRIORITY (decl);
3231 pi = get_priority_info (priority);
3233 pi->initializations_p = 1;
3235 pi->destructions_p = 1;
3237 /* Conditionalize this initialization on being in the right priority
3238 and being initializing/finalizing appropriately. */
3239 priority_if_stmt = begin_if_stmt ();
3240 cond = cp_build_binary_op (input_location,
3243 build_int_cst (NULL_TREE, priority),
3244 tf_warning_or_error);
3245 finish_if_stmt_cond (cond, priority_if_stmt);
3247 /* Process initializers with same priority. */
3249 && DECL_EFFECTIVE_INIT_PRIORITY (TREE_VALUE (node)) == priority;
3250 node = TREE_CHAIN (node))
3251 /* Do one initialization or destruction. */
3252 one_static_initialization_or_destruction (TREE_VALUE (node),
3253 TREE_PURPOSE (node), initp);
3255 /* Finish up the priority if-stmt body. */
3256 finish_then_clause (priority_if_stmt);
3257 finish_if_stmt (priority_if_stmt);
3261 /* Finish up the init/destruct if-stmt body. */
3262 finish_then_clause (init_if_stmt);
3263 finish_if_stmt (init_if_stmt);
3266 /* VARS is a list of variables with static storage duration which may
3267 need initialization and/or finalization. Remove those variables
3268 that don't really need to be initialized or finalized, and return
3269 the resulting list. The order in which the variables appear in
3270 VARS is in reverse order of the order in which they should actually
3271 be initialized. The list we return is in the unreversed order;
3272 i.e., the first variable should be initialized first. */
3275 prune_vars_needing_no_initialization (tree *vars)
3278 tree result = NULL_TREE;
3283 tree decl = TREE_VALUE (t);
3284 tree init = TREE_PURPOSE (t);
3286 /* Deal gracefully with error. */
3287 if (decl == error_mark_node)
3289 var = &TREE_CHAIN (t);
3293 /* The only things that can be initialized are variables. */
3294 gcc_assert (TREE_CODE (decl) == VAR_DECL);
3296 /* If this object is not defined, we don't need to do anything
3298 if (DECL_EXTERNAL (decl))
3300 var = &TREE_CHAIN (t);
3304 /* Also, if the initializer already contains errors, we can bail
3306 if (init && TREE_CODE (init) == TREE_LIST
3307 && value_member (error_mark_node, init))
3309 var = &TREE_CHAIN (t);
3313 /* This variable is going to need initialization and/or
3314 finalization, so we add it to the list. */
3315 *var = TREE_CHAIN (t);
3316 TREE_CHAIN (t) = result;
3323 /* Make sure we have told the back end about all the variables in
3327 write_out_vars (tree vars)
3331 for (v = vars; v; v = TREE_CHAIN (v))
3333 tree var = TREE_VALUE (v);
3334 if (!var_finalized_p (var))
3336 import_export_decl (var);
3337 rest_of_decl_compilation (var, 1, 1);
3342 /* Generate a static constructor (if CONSTRUCTOR_P) or destructor
3343 (otherwise) that will initialize all global objects with static
3344 storage duration having the indicated PRIORITY. */
3347 generate_ctor_or_dtor_function (bool constructor_p, int priority,
3355 input_location = *locus;
3357 /* Was: locus->line++; */
3359 /* We use `I' to indicate initialization and `D' to indicate
3361 function_key = constructor_p ? 'I' : 'D';
3363 /* We emit the function lazily, to avoid generating empty
3364 global constructors and destructors. */
3367 /* For Objective-C++, we may need to initialize metadata found in this module.
3368 This must be done _before_ any other static initializations. */
3369 if (c_dialect_objc () && (priority == DEFAULT_INIT_PRIORITY)
3370 && constructor_p && objc_static_init_needed_p ())
3372 body = start_objects (function_key, priority);
3373 objc_generate_static_init_call (NULL_TREE);
3376 /* Call the static storage duration function with appropriate
3378 FOR_EACH_VEC_ELT (tree, ssdf_decls, i, fndecl)
3380 /* Calls to pure or const functions will expand to nothing. */
3381 if (! (flags_from_decl_or_type (fndecl) & (ECF_CONST | ECF_PURE)))
3386 body = start_objects (function_key, priority);
3388 call = cp_build_function_call_nary (fndecl, tf_warning_or_error,
3389 build_int_cst (NULL_TREE,
3391 build_int_cst (NULL_TREE,
3394 finish_expr_stmt (call);
3398 /* Close out the function. */
3400 finish_objects (function_key, priority, body);
3403 /* Generate constructor and destructor functions for the priority
3407 generate_ctor_and_dtor_functions_for_priority (splay_tree_node n, void * data)
3409 location_t *locus = (location_t *) data;
3410 int priority = (int) n->key;
3411 priority_info pi = (priority_info) n->value;
3413 /* Generate the functions themselves, but only if they are really
3415 if (pi->initializations_p)
3416 generate_ctor_or_dtor_function (/*constructor_p=*/true, priority, locus);
3417 if (pi->destructions_p)
3418 generate_ctor_or_dtor_function (/*constructor_p=*/false, priority, locus);
3420 /* Keep iterating. */
3424 /* Called via LANGHOOK_CALLGRAPH_ANALYZE_EXPR. It is supposed to mark
3425 decls referenced from front-end specific constructs; it will be called
3426 only for language-specific tree nodes.
3428 Here we must deal with member pointers. */
3431 cxx_callgraph_analyze_expr (tree *tp, int *walk_subtrees ATTRIBUTE_UNUSED)
3435 switch (TREE_CODE (t))
3438 if (TYPE_PTRMEMFUNC_P (TREE_TYPE (t)))
3439 cgraph_mark_address_taken_node (
3440 cgraph_get_create_node (PTRMEM_CST_MEMBER (t)));
3443 if (TREE_CODE (BASELINK_FUNCTIONS (t)) == FUNCTION_DECL)
3444 cgraph_mark_address_taken_node (
3445 cgraph_get_create_node (BASELINK_FUNCTIONS (t)));
3448 if (DECL_CONTEXT (t)
3449 && flag_use_repository
3450 && TREE_CODE (DECL_CONTEXT (t)) == FUNCTION_DECL)
3451 /* If we need a static variable in a function, then we
3452 need the containing function. */
3453 mark_decl_referenced (DECL_CONTEXT (t));
3462 /* Java requires that we be able to reference a local address for a
3463 method, and not be confused by PLT entries. If hidden aliases are
3464 supported, collect and return all the functions for which we should
3465 emit a hidden alias. */
3467 static struct pointer_set_t *
3468 collect_candidates_for_java_method_aliases (void)
3470 struct cgraph_node *node;
3471 struct pointer_set_t *candidates = NULL;
3473 #ifndef HAVE_GAS_HIDDEN
3477 for (node = cgraph_nodes; node ; node = node->next)
3479 tree fndecl = node->decl;
3481 if (DECL_CONTEXT (fndecl)
3482 && TYPE_P (DECL_CONTEXT (fndecl))
3483 && TYPE_FOR_JAVA (DECL_CONTEXT (fndecl))
3484 && TARGET_USE_LOCAL_THUNK_ALIAS_P (fndecl))
3486 if (candidates == NULL)
3487 candidates = pointer_set_create ();
3488 pointer_set_insert (candidates, fndecl);
3496 /* Java requires that we be able to reference a local address for a
3497 method, and not be confused by PLT entries. If hidden aliases are
3498 supported, emit one for each java function that we've emitted.
3499 CANDIDATES is the set of FUNCTION_DECLs that were gathered
3500 by collect_candidates_for_java_method_aliases. */
3503 build_java_method_aliases (struct pointer_set_t *candidates)
3505 struct cgraph_node *node;
3507 #ifndef HAVE_GAS_HIDDEN
3511 for (node = cgraph_nodes; node ; node = node->next)
3513 tree fndecl = node->decl;
3515 if (TREE_ASM_WRITTEN (fndecl)
3516 && pointer_set_contains (candidates, fndecl))
3518 /* Mangle the name in a predictable way; we need to reference
3519 this from a java compiled object file. */
3520 tree oid, nid, alias;
3524 oid = DECL_ASSEMBLER_NAME (fndecl);
3525 oname = IDENTIFIER_POINTER (oid);
3526 gcc_assert (oname[0] == '_' && oname[1] == 'Z');
3527 nname = ACONCAT (("_ZGA", oname+2, NULL));
3528 nid = get_identifier (nname);
3530 alias = make_alias_for (fndecl, nid);
3531 TREE_PUBLIC (alias) = 1;
3532 DECL_VISIBILITY (alias) = VISIBILITY_HIDDEN;
3534 assemble_alias (alias, oid);
3539 /* Return C++ property of T, based on given operation OP. */
3542 cpp_check (tree t, cpp_operation op)
3547 return DECL_PURE_VIRTUAL_P (t);
3548 case IS_CONSTRUCTOR:
3549 return DECL_CONSTRUCTOR_P (t);
3551 return DECL_DESTRUCTOR_P (t);
3552 case IS_COPY_CONSTRUCTOR:
3553 return DECL_COPY_CONSTRUCTOR_P (t);
3555 return TREE_CODE (t) == TEMPLATE_DECL;
3561 /* Collect source file references recursively, starting from NAMESPC. */
3564 collect_source_refs (tree namespc)
3571 /* Iterate over names in this name space. */
3572 for (t = NAMESPACE_LEVEL (namespc)->names; t; t = TREE_CHAIN (t))
3573 if (!DECL_IS_BUILTIN (t) )
3574 collect_source_ref (DECL_SOURCE_FILE (t));
3576 /* Dump siblings, if any */
3577 collect_source_refs (TREE_CHAIN (namespc));
3579 /* Dump children, if any */
3580 collect_source_refs (NAMESPACE_LEVEL (namespc)->namespaces);
3583 /* Collect decls relevant to SOURCE_FILE from all namespaces recursively,
3584 starting from NAMESPC. */
3587 collect_ada_namespace (tree namespc, const char *source_file)
3592 /* Collect decls from this namespace */
3593 collect_ada_nodes (NAMESPACE_LEVEL (namespc)->names, source_file);
3595 /* Collect siblings, if any */
3596 collect_ada_namespace (TREE_CHAIN (namespc), source_file);
3598 /* Collect children, if any */
3599 collect_ada_namespace (NAMESPACE_LEVEL (namespc)->namespaces, source_file);
3602 /* Returns true iff there is a definition available for variable or
3606 decl_defined_p (tree decl)
3608 if (TREE_CODE (decl) == FUNCTION_DECL)
3609 return (DECL_INITIAL (decl) != NULL_TREE);
3612 gcc_assert (TREE_CODE (decl) == VAR_DECL);
3613 return !DECL_EXTERNAL (decl);
3617 /* Nonzero for a VAR_DECL whose value can be used in a constant expression.
3621 An integral constant-expression can only involve ... const
3622 variables of integral or enumeration types initialized with
3623 constant expressions ...
3625 C++0x also allows constexpr variables and temporaries initialized
3626 with constant expressions. We handle the former here, but the latter
3627 are just folded away in cxx_eval_constant_expression.
3629 The standard does not require that the expression be non-volatile.
3630 G++ implements the proposed correction in DR 457. */
3633 decl_constant_var_p (tree decl)
3635 if (!decl_maybe_constant_var_p (decl))
3638 /* We don't know if a template static data member is initialized with
3639 a constant expression until we instantiate its initializer. Even
3640 in the case of a constexpr variable, we can't treat it as a
3641 constant until its initializer is complete in case it's used in
3642 its own initializer. */
3644 return DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl);
3647 /* Returns true if DECL could be a symbolic constant variable, depending on
3651 decl_maybe_constant_var_p (tree decl)
3653 tree type = TREE_TYPE (decl);
3654 if (TREE_CODE (decl) != VAR_DECL)
3656 if (DECL_DECLARED_CONSTEXPR_P (decl))
3658 return (CP_TYPE_CONST_NON_VOLATILE_P (type)
3659 && INTEGRAL_OR_ENUMERATION_TYPE_P (type));
3662 /* Complain that DECL uses a type with no linkage but is never defined. */
3665 no_linkage_error (tree decl)
3667 tree t = no_linkage_check (TREE_TYPE (decl), /*relaxed_p=*/false);
3668 if (TYPE_ANONYMOUS_P (t))
3670 permerror (0, "%q+#D, declared using anonymous type, "
3671 "is used but never defined", decl);
3672 if (is_typedef_decl (TYPE_NAME (t)))
3673 permerror (0, "%q+#D does not refer to the unqualified type, "
3674 "so it is not used for linkage", TYPE_NAME (t));
3677 permerror (0, "%q+#D, declared using local type %qT, "
3678 "is used but never defined", decl, t);
3681 /* Collect declarations from all namespaces relevant to SOURCE_FILE. */
3684 collect_all_refs (const char *source_file)
3686 collect_ada_namespace (global_namespace, source_file);
3689 /* Clear DECL_EXTERNAL for NODE. */
3692 clear_decl_external (struct cgraph_node *node, void *data ATTRIBUTE_UNUSED)
3694 DECL_EXTERNAL (node->decl) = 0;
3698 /* This routine is called at the end of compilation.
3699 Its job is to create all the code needed to initialize and
3700 destroy the global aggregates. We do the destruction
3701 first, since that way we only need to reverse the decls once. */
3704 cp_write_global_declarations (void)
3710 unsigned ssdf_count = 0;
3713 struct pointer_set_t *candidates;
3715 locus = input_location;
3718 /* Bad parse errors. Just forget about it. */
3719 if (! global_bindings_p () || current_class_type
3720 || !VEC_empty (tree,decl_namespace_list))
3724 c_common_write_pch ();
3726 cgraph_process_same_body_aliases ();
3728 /* Handle -fdump-ada-spec[-slim] */
3729 if (dump_enabled_p (TDI_ada))
3731 if (get_dump_file_info (TDI_ada)->flags & TDF_SLIM)
3732 collect_source_ref (main_input_filename);
3734 collect_source_refs (global_namespace);
3736 dump_ada_specs (collect_all_refs, cpp_check);
3739 /* FIXME - huh? was input_line -= 1;*/
3741 timevar_start (TV_PHASE_DEFERRED);
3743 /* We now have to write out all the stuff we put off writing out.
3746 o Template specializations that we have not yet instantiated,
3747 but which are needed.
3748 o Initialization and destruction for non-local objects with
3749 static storage duration. (Local objects with static storage
3750 duration are initialized when their scope is first entered,
3751 and are cleaned up via atexit.)
3752 o Virtual function tables.
3754 All of these may cause others to be needed. For example,
3755 instantiating one function may cause another to be needed, and
3756 generating the initializer for an object may cause templates to be
3757 instantiated, etc., etc. */
3759 emit_support_tinfos ();
3768 /* If there are templates that we've put off instantiating, do
3770 instantiate_pending_templates (retries);
3773 /* Write out virtual tables as required. Note that writing out
3774 the virtual table for a template class may cause the
3775 instantiation of members of that class. If we write out
3776 vtables then we remove the class from our list so we don't
3777 have to look at it again. */
3779 while (keyed_classes != NULL_TREE
3780 && maybe_emit_vtables (TREE_VALUE (keyed_classes)))
3783 keyed_classes = TREE_CHAIN (keyed_classes);
3789 tree next = TREE_CHAIN (t);
3793 if (maybe_emit_vtables (TREE_VALUE (next)))
3796 TREE_CHAIN (t) = TREE_CHAIN (next);
3801 next = TREE_CHAIN (t);
3805 /* Write out needed type info variables. We have to be careful
3806 looping through unemitted decls, because emit_tinfo_decl may
3807 cause other variables to be needed. New elements will be
3808 appended, and we remove from the vector those that actually
3810 for (i = VEC_length (tree, unemitted_tinfo_decls);
3811 VEC_iterate (tree, unemitted_tinfo_decls, --i, t);)
3812 if (emit_tinfo_decl (t))
3815 VEC_unordered_remove (tree, unemitted_tinfo_decls, i);
3818 /* The list of objects with static storage duration is built up
3819 in reverse order. We clear STATIC_AGGREGATES so that any new
3820 aggregates added during the initialization of these will be
3821 initialized in the correct order when we next come around the
3823 vars = prune_vars_needing_no_initialization (&static_aggregates);
3827 /* We need to start a new initialization function each time
3828 through the loop. That's because we need to know which
3829 vtables have been referenced, and TREE_SYMBOL_REFERENCED
3830 isn't computed until a function is finished, and written
3831 out. That's a deficiency in the back end. When this is
3832 fixed, these initialization functions could all become
3833 inline, with resulting performance improvements. */
3836 /* Set the line and file, so that it is obviously not from
3838 input_location = locus;
3839 ssdf_body = start_static_storage_duration_function (ssdf_count);
3841 /* Make sure the back end knows about all the variables. */
3842 write_out_vars (vars);
3844 /* First generate code to do all the initializations. */
3846 do_static_initialization_or_destruction (vars, /*initp=*/true);
3848 /* Then, generate code to do all the destructions. Do these
3849 in reverse order so that the most recently constructed
3850 variable is the first destroyed. If we're using
3851 __cxa_atexit, then we don't need to do this; functions
3852 were registered at initialization time to destroy the
3854 if (!flag_use_cxa_atexit && vars)
3856 vars = nreverse (vars);
3857 do_static_initialization_or_destruction (vars, /*initp=*/false);
3862 /* Finish up the static storage duration function for this
3864 input_location = locus;
3865 finish_static_storage_duration_function (ssdf_body);
3867 /* All those initializations and finalizations might cause
3868 us to need more inline functions, more template
3869 instantiations, etc. */
3872 /* ??? was: locus.line++; */
3875 /* Go through the set of inline functions whose bodies have not
3876 been emitted yet. If out-of-line copies of these functions
3877 are required, emit them. */
3878 FOR_EACH_VEC_ELT (tree, deferred_fns, i, decl)
3880 /* Does it need synthesizing? */
3881 if (DECL_DEFAULTED_FN (decl) && ! DECL_INITIAL (decl)
3882 && (! DECL_REALLY_EXTERN (decl) || possibly_inlined_p (decl)))
3884 /* Even though we're already at the top-level, we push
3885 there again. That way, when we pop back a few lines
3886 hence, all of our state is restored. Otherwise,
3887 finish_function doesn't clean things up, and we end
3888 up with CURRENT_FUNCTION_DECL set. */
3889 push_to_top_level ();
3890 /* The decl's location will mark where it was first
3891 needed. Save that so synthesize method can indicate
3892 where it was needed from, in case of error */
3893 input_location = DECL_SOURCE_LOCATION (decl);
3894 synthesize_method (decl);
3895 pop_from_top_level ();
3899 if (!DECL_SAVED_TREE (decl))
3902 /* We lie to the back end, pretending that some functions
3903 are not defined when they really are. This keeps these
3904 functions from being put out unnecessarily. But, we must
3905 stop lying when the functions are referenced, or if they
3906 are not comdat since they need to be put out now. If
3907 DECL_INTERFACE_KNOWN, then we have already set
3908 DECL_EXTERNAL appropriately, so there's no need to check
3909 again, and we do not want to clear DECL_EXTERNAL if a
3910 previous call to import_export_decl set it.
3912 This is done in a separate for cycle, because if some
3913 deferred function is contained in another deferred
3914 function later in deferred_fns varray,
3915 rest_of_compilation would skip this function and we
3916 really cannot expand the same function twice. */
3917 import_export_decl (decl);
3918 if (DECL_NOT_REALLY_EXTERN (decl)
3919 && DECL_INITIAL (decl)
3920 && decl_needed_p (decl))
3922 struct cgraph_node *node, *next;
3924 node = cgraph_get_node (decl);
3925 if (node->same_body_alias)
3926 node = cgraph_alias_aliased_node (node);
3928 cgraph_for_node_and_aliases (node, clear_decl_external,
3930 /* If we mark !DECL_EXTERNAL one of the symbols in some comdat
3931 group, we need to mark all symbols in the same comdat group
3933 if (node->same_comdat_group)
3934 for (next = node->same_comdat_group;
3936 next = next->same_comdat_group)
3937 cgraph_for_node_and_aliases (next, clear_decl_external,
3941 /* If we're going to need to write this function out, and
3942 there's already a body for it, create RTL for it now.
3943 (There might be no body if this is a method we haven't
3944 gotten around to synthesizing yet.) */
3945 if (!DECL_EXTERNAL (decl)
3946 && decl_needed_p (decl)
3947 && !TREE_ASM_WRITTEN (decl)
3948 && !cgraph_get_node (decl)->local.finalized)
3950 /* We will output the function; no longer consider it in this
3952 DECL_DEFER_OUTPUT (decl) = 0;
3953 /* Generate RTL for this function now that we know we
3955 expand_or_defer_fn (decl);
3956 /* If we're compiling -fsyntax-only pretend that this
3957 function has been written out so that we don't try to
3959 if (flag_syntax_only)
3960 TREE_ASM_WRITTEN (decl) = 1;
3965 if (walk_namespaces (wrapup_globals_for_namespace, /*data=*/0))
3968 /* Static data members are just like namespace-scope globals. */
3969 FOR_EACH_VEC_ELT (tree, pending_statics, i, decl)
3971 if (var_finalized_p (decl) || DECL_REALLY_EXTERN (decl)
3972 /* Don't write it out if we haven't seen a definition. */
3973 || DECL_IN_AGGR_P (decl))
3975 import_export_decl (decl);
3976 /* If this static data member is needed, provide it to the
3978 if (DECL_NOT_REALLY_EXTERN (decl) && decl_needed_p (decl))
3979 DECL_EXTERNAL (decl) = 0;
3981 if (VEC_length (tree, pending_statics) != 0
3982 && wrapup_global_declarations (VEC_address (tree, pending_statics),
3983 VEC_length (tree, pending_statics)))
3990 /* All used inline functions must have a definition at this point. */
3991 FOR_EACH_VEC_ELT (tree, deferred_fns, i, decl)
3993 if (/* Check online inline functions that were actually used. */
3994 DECL_ODR_USED (decl) && DECL_DECLARED_INLINE_P (decl)
3995 /* If the definition actually was available here, then the
3996 fact that the function was not defined merely represents
3997 that for some reason (use of a template repository,
3998 #pragma interface, etc.) we decided not to emit the
4000 && !DECL_INITIAL (decl)
4001 /* Don't complain if the template was defined. */
4002 && !(DECL_TEMPLATE_INSTANTIATION (decl)
4003 && DECL_INITIAL (DECL_TEMPLATE_RESULT
4004 (template_for_substitution (decl)))))
4006 warning (0, "inline function %q+D used but never defined", decl);
4007 /* Avoid a duplicate warning from check_global_declaration_1. */
4008 TREE_NO_WARNING (decl) = 1;
4012 /* So must decls that use a type with no linkage. */
4013 FOR_EACH_VEC_ELT (tree, no_linkage_decls, i, decl)
4014 if (!decl_defined_p (decl))
4015 no_linkage_error (decl);
4017 /* Then, do the Objective-C stuff. This is where all the
4018 Objective-C module stuff gets generated (symtab,
4019 class/protocol/selector lists etc). This must be done after C++
4020 templates, destructors etc. so that selectors used in C++
4021 templates are properly allocated. */
4022 if (c_dialect_objc ())
4023 objc_write_global_declarations ();
4025 /* We give C linkage to static constructors and destructors. */
4026 push_lang_context (lang_name_c);
4028 /* Generate initialization and destruction functions for all
4029 priorities for which they are required. */
4030 if (priority_info_map)
4031 splay_tree_foreach (priority_info_map,
4032 generate_ctor_and_dtor_functions_for_priority,
4034 else if (c_dialect_objc () && objc_static_init_needed_p ())
4035 /* If this is obj-c++ and we need a static init, call
4036 generate_ctor_or_dtor_function. */
4037 generate_ctor_or_dtor_function (/*constructor_p=*/true,
4038 DEFAULT_INIT_PRIORITY, &locus);
4040 /* We're done with the splay-tree now. */
4041 if (priority_info_map)
4042 splay_tree_delete (priority_info_map);
4044 /* Generate any missing aliases. */
4045 maybe_apply_pending_pragma_weaks ();
4047 /* We're done with static constructors, so we can go back to "C++"
4049 pop_lang_context ();
4051 /* Collect candidates for Java hidden aliases. */
4052 candidates = collect_candidates_for_java_method_aliases ();
4054 timevar_stop (TV_PHASE_DEFERRED);
4055 timevar_start (TV_PHASE_CGRAPH);
4057 cgraph_finalize_compilation_unit ();
4059 timevar_stop (TV_PHASE_CGRAPH);
4060 timevar_start (TV_PHASE_CHECK_DBGINFO);
4062 /* Now, issue warnings about static, but not defined, functions,
4063 etc., and emit debugging information. */
4064 walk_namespaces (wrapup_globals_for_namespace, /*data=*/&reconsider);
4065 if (VEC_length (tree, pending_statics) != 0)
4067 check_global_declarations (VEC_address (tree, pending_statics),
4068 VEC_length (tree, pending_statics));
4069 emit_debug_global_declarations (VEC_address (tree, pending_statics),
4070 VEC_length (tree, pending_statics));
4073 perform_deferred_noexcept_checks ();
4075 /* Generate hidden aliases for Java. */
4078 build_java_method_aliases (candidates);
4079 pointer_set_destroy (candidates);
4084 /* The entire file is now complete. If requested, dump everything
4088 FILE *stream = dump_begin (TDI_tu, &flags);
4092 dump_node (global_namespace, flags & ~TDF_SLIM, stream);
4093 dump_end (TDI_tu, stream);
4097 if (flag_detailed_statistics)
4099 dump_tree_statistics ();
4100 dump_time_statistics ();
4102 input_location = locus;
4104 #ifdef ENABLE_CHECKING
4105 validate_conversion_obstack ();
4106 #endif /* ENABLE_CHECKING */
4108 timevar_stop (TV_PHASE_CHECK_DBGINFO);
4111 /* FN is an OFFSET_REF, DOTSTAR_EXPR or MEMBER_REF indicating the
4112 function to call in parse-tree form; it has not yet been
4113 semantically analyzed. ARGS are the arguments to the function.
4114 They have already been semantically analyzed. This may change
4118 build_offset_ref_call_from_tree (tree fn, VEC(tree,gc) **args)
4121 VEC(tree,gc) *orig_args = NULL;
4126 object = TREE_OPERAND (fn, 0);
4128 if (processing_template_decl)
4130 gcc_assert (TREE_CODE (fn) == DOTSTAR_EXPR
4131 || TREE_CODE (fn) == MEMBER_REF);
4132 if (type_dependent_expression_p (fn)
4133 || any_type_dependent_arguments_p (*args))
4134 return build_nt_call_vec (fn, *args);
4136 orig_args = make_tree_vector_copy (*args);
4138 /* Transform the arguments and add the implicit "this"
4139 parameter. That must be done before the FN is transformed
4140 because we depend on the form of FN. */
4141 make_args_non_dependent (*args);
4142 object = build_non_dependent_expr (object);
4143 if (TREE_CODE (TREE_TYPE (fn)) == METHOD_TYPE)
4145 if (TREE_CODE (fn) == DOTSTAR_EXPR)
4146 object = cp_build_addr_expr (object, tf_warning_or_error);
4147 VEC_safe_insert (tree, gc, *args, 0, object);
4149 /* Now that the arguments are done, transform FN. */
4150 fn = build_non_dependent_expr (fn);
4153 /* A qualified name corresponding to a bound pointer-to-member is
4154 represented as an OFFSET_REF:
4156 struct B { void g(); };
4158 void B::g() { (this->*p)(); } */
4159 if (TREE_CODE (fn) == OFFSET_REF)
4161 tree object_addr = cp_build_addr_expr (object, tf_warning_or_error);
4162 fn = TREE_OPERAND (fn, 1);
4163 fn = get_member_function_from_ptrfunc (&object_addr, fn);
4164 VEC_safe_insert (tree, gc, *args, 0, object_addr);
4167 if (CLASS_TYPE_P (TREE_TYPE (fn)))
4168 expr = build_op_call (fn, args, tf_warning_or_error);
4170 expr = cp_build_function_call_vec (fn, args, tf_warning_or_error);
4171 if (processing_template_decl && expr != error_mark_node)
4172 expr = build_min_non_dep_call_vec (expr, orig_fn, orig_args);
4174 if (orig_args != NULL)
4175 release_tree_vector (orig_args);
4182 check_default_args (tree x)
4184 tree arg = TYPE_ARG_TYPES (TREE_TYPE (x));
4185 bool saw_def = false;
4186 int i = 0 - (TREE_CODE (TREE_TYPE (x)) == METHOD_TYPE);
4187 for (; arg && arg != void_list_node; arg = TREE_CHAIN (arg), ++i)
4189 if (TREE_PURPOSE (arg))
4193 error ("default argument missing for parameter %P of %q+#D", i, x);
4194 TREE_PURPOSE (arg) = error_mark_node;
4199 /* Return true if function DECL can be inlined. This is used to force
4200 instantiation of methods that might be interesting for inlining. */
4202 possibly_inlined_p (tree decl)
4204 gcc_assert (TREE_CODE (decl) == FUNCTION_DECL);
4205 if (DECL_UNINLINABLE (decl))
4207 if (!optimize || pragma_java_exceptions)
4208 return DECL_DECLARED_INLINE_P (decl);
4209 /* When optimizing, we might inline everything when flatten
4210 attribute or heuristics inlining for size or autoinlining
4215 /* Mark DECL (either a _DECL or a BASELINK) as "used" in the program.
4216 If DECL is a specialization or implicitly declared class member,
4217 generate the actual definition. Return false if something goes
4218 wrong, true otherwise. */
4221 mark_used (tree decl)
4223 /* If DECL is a BASELINK for a single function, then treat it just
4224 like the DECL for the function. Otherwise, if the BASELINK is
4225 for an overloaded function, we don't know which function was
4226 actually used until after overload resolution. */
4227 if (BASELINK_P (decl))
4229 decl = BASELINK_FUNCTIONS (decl);
4230 if (really_overloaded_fn (decl))
4232 decl = OVL_CURRENT (decl);
4235 /* Set TREE_USED for the benefit of -Wunused. */
4236 TREE_USED (decl) = 1;
4237 if (DECL_CLONED_FUNCTION_P (decl))
4238 TREE_USED (DECL_CLONED_FUNCTION (decl)) = 1;
4240 if (TREE_CODE (decl) == FUNCTION_DECL
4241 && DECL_DELETED_FN (decl))
4243 if (DECL_ARTIFICIAL (decl))
4245 if (DECL_OVERLOADED_OPERATOR_P (decl) == TYPE_EXPR
4246 && LAMBDA_TYPE_P (DECL_CONTEXT (decl)))
4248 /* We mark a lambda conversion op as deleted if we can't
4249 generate it properly; see maybe_add_lambda_conv_op. */
4250 sorry ("converting lambda which uses %<...%> to "
4251 "function pointer");
4255 error ("use of deleted function %qD", decl);
4256 if (!maybe_explain_implicit_delete (decl))
4257 error_at (DECL_SOURCE_LOCATION (decl), "declared here");
4261 /* We can only check DECL_ODR_USED on variables or functions with
4262 DECL_LANG_SPECIFIC set, and these are also the only decls that we
4263 might need special handling for. */
4264 if ((TREE_CODE (decl) != VAR_DECL && TREE_CODE (decl) != FUNCTION_DECL)
4265 || DECL_LANG_SPECIFIC (decl) == NULL
4266 || DECL_THUNK_P (decl))
4269 /* We only want to do this processing once. We don't need to keep trying
4270 to instantiate inline templates, because unit-at-a-time will make sure
4271 we get them compiled before functions that want to inline them. */
4272 if (DECL_ODR_USED (decl))
4275 /* If within finish_function, defer the rest until that function
4276 finishes, otherwise it might recurse. */
4277 if (defer_mark_used_calls)
4279 VEC_safe_push (tree, gc, deferred_mark_used_calls, decl);
4283 if (TREE_CODE (decl) == FUNCTION_DECL)
4284 maybe_instantiate_noexcept (decl);
4286 /* Normally, we can wait until instantiation-time to synthesize DECL.
4287 However, if DECL is a static data member initialized with a constant
4288 or a constexpr function, we need it right now because a reference to
4289 such a data member or a call to such function is not value-dependent. */
4290 if ((decl_maybe_constant_var_p (decl)
4291 || (TREE_CODE (decl) == FUNCTION_DECL
4292 && DECL_DECLARED_CONSTEXPR_P (decl)))
4293 && DECL_LANG_SPECIFIC (decl)
4294 && DECL_TEMPLATE_INFO (decl)
4295 && !uses_template_parms (DECL_TI_ARGS (decl)))
4297 /* Instantiating a function will result in garbage collection. We
4298 must treat this situation as if we were within the body of a
4299 function so as to avoid collecting live data only referenced from
4300 the stack (such as overload resolution candidates). */
4302 instantiate_decl (decl, /*defer_ok=*/false,
4303 /*expl_inst_class_mem_p=*/false);
4307 /* If we don't need a value, then we don't need to synthesize DECL. */
4308 if (cp_unevaluated_operand != 0)
4311 if (processing_template_decl)
4314 /* Check this too in case we're within fold_non_dependent_expr. */
4315 if (DECL_TEMPLATE_INFO (decl)
4316 && uses_template_parms (DECL_TI_ARGS (decl)))
4319 DECL_ODR_USED (decl) = 1;
4320 if (DECL_CLONED_FUNCTION_P (decl))
4321 DECL_ODR_USED (DECL_CLONED_FUNCTION (decl)) = 1;
4323 /* DR 757: A type without linkage shall not be used as the type of a
4324 variable or function with linkage, unless
4325 o the variable or function has extern "C" linkage (7.5 [dcl.link]), or
4326 o the variable or function is not used (3.2 [basic.def.odr]) or is
4327 defined in the same translation unit. */
4328 if (cxx_dialect > cxx98
4329 && decl_linkage (decl) != lk_none
4330 && !DECL_EXTERN_C_P (decl)
4331 && !DECL_ARTIFICIAL (decl)
4332 && !decl_defined_p (decl)
4333 && no_linkage_check (TREE_TYPE (decl), /*relaxed_p=*/false))
4335 if (is_local_extern (decl))
4336 /* There's no way to define a local extern, and adding it to
4337 the vector interferes with GC, so give an error now. */
4338 no_linkage_error (decl);
4340 VEC_safe_push (tree, gc, no_linkage_decls, decl);
4343 if (TREE_CODE (decl) == FUNCTION_DECL && DECL_DECLARED_INLINE_P (decl)
4344 && !DECL_INITIAL (decl) && !DECL_ARTIFICIAL (decl))
4345 /* Remember it, so we can check it was defined. */
4346 note_vague_linkage_fn (decl);
4348 /* Is it a synthesized method that needs to be synthesized? */
4349 if (TREE_CODE (decl) == FUNCTION_DECL
4350 && DECL_NONSTATIC_MEMBER_FUNCTION_P (decl)
4351 && DECL_DEFAULTED_FN (decl)
4352 /* A function defaulted outside the class is synthesized either by
4353 cp_finish_decl or instantiate_decl. */
4354 && !DECL_DEFAULTED_OUTSIDE_CLASS_P (decl)
4355 && ! DECL_INITIAL (decl))
4357 /* Defer virtual destructors so that thunks get the right
4359 if (DECL_VIRTUAL_P (decl) && !at_eof)
4361 note_vague_linkage_fn (decl);
4365 /* Remember the current location for a function we will end up
4366 synthesizing. Then we can inform the user where it was
4367 required in the case of error. */
4368 DECL_SOURCE_LOCATION (decl) = input_location;
4370 /* Synthesizing an implicitly defined member function will result in
4371 garbage collection. We must treat this situation as if we were
4372 within the body of a function so as to avoid collecting live data
4373 on the stack (such as overload resolution candidates).
4375 We could just let cp_write_global_declarations handle synthesizing
4376 this function by adding it to deferred_fns, but doing
4377 it at the use site produces better error messages. */
4379 synthesize_method (decl);
4381 /* If this is a synthesized method we don't need to
4382 do the instantiation test below. */
4384 else if ((TREE_CODE (decl) == FUNCTION_DECL || TREE_CODE (decl) == VAR_DECL)
4385 && DECL_TEMPLATE_INFO (decl)
4386 && (!DECL_EXPLICIT_INSTANTIATION (decl)
4387 || always_instantiate_p (decl)))
4388 /* If this is a function or variable that is an instance of some
4389 template, we now know that we will need to actually do the
4390 instantiation. We check that DECL is not an explicit
4391 instantiation because that is not checked in instantiate_decl.
4393 We put off instantiating functions in order to improve compile
4394 times. Maintaining a stack of active functions is expensive,
4395 and the inliner knows to instantiate any functions it might
4396 need. Therefore, we always try to defer instantiation. */
4399 instantiate_decl (decl, /*defer_ok=*/true,
4400 /*expl_inst_class_mem_p=*/false);
4407 #include "gt-cp-decl2.h"