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)
1308 if (processing_template_decl)
1310 if (check_for_bare_parameter_packs (attributes))
1313 save_template_attributes (&attributes, decl);
1316 cp_check_const_attributes (attributes);
1318 if (TREE_CODE (*decl) == TEMPLATE_DECL)
1319 decl = &DECL_TEMPLATE_RESULT (*decl);
1321 decl_attributes (decl, attributes, flags);
1323 if (TREE_CODE (*decl) == TYPE_DECL)
1324 SET_IDENTIFIER_TYPE_VALUE (DECL_NAME (*decl), TREE_TYPE (*decl));
1327 /* Walks through the namespace- or function-scope anonymous union
1328 OBJECT, with the indicated TYPE, building appropriate VAR_DECLs.
1329 Returns one of the fields for use in the mangled name. */
1332 build_anon_union_vars (tree type, tree object)
1334 tree main_decl = NULL_TREE;
1337 /* Rather than write the code to handle the non-union case,
1338 just give an error. */
1339 if (TREE_CODE (type) != UNION_TYPE)
1341 error ("anonymous struct not inside named type");
1342 return error_mark_node;
1345 for (field = TYPE_FIELDS (type);
1347 field = DECL_CHAIN (field))
1352 if (DECL_ARTIFICIAL (field))
1354 if (TREE_CODE (field) != FIELD_DECL)
1356 permerror (input_location, "%q+#D invalid; an anonymous union can only "
1357 "have non-static data members", field);
1361 if (TREE_PRIVATE (field))
1362 permerror (input_location, "private member %q+#D in anonymous union", field);
1363 else if (TREE_PROTECTED (field))
1364 permerror (input_location, "protected member %q+#D in anonymous union", field);
1366 if (processing_template_decl)
1367 ref = build_min_nt (COMPONENT_REF, object,
1368 DECL_NAME (field), NULL_TREE);
1370 ref = build_class_member_access_expr (object, field, NULL_TREE,
1371 false, tf_warning_or_error);
1373 if (DECL_NAME (field))
1377 decl = build_decl (input_location,
1378 VAR_DECL, DECL_NAME (field), TREE_TYPE (field));
1379 DECL_ANON_UNION_VAR_P (decl) = 1;
1380 DECL_ARTIFICIAL (decl) = 1;
1382 base = get_base_address (object);
1383 TREE_PUBLIC (decl) = TREE_PUBLIC (base);
1384 TREE_STATIC (decl) = TREE_STATIC (base);
1385 DECL_EXTERNAL (decl) = DECL_EXTERNAL (base);
1387 SET_DECL_VALUE_EXPR (decl, ref);
1388 DECL_HAS_VALUE_EXPR_P (decl) = 1;
1390 decl = pushdecl (decl);
1392 else if (ANON_AGGR_TYPE_P (TREE_TYPE (field)))
1393 decl = build_anon_union_vars (TREE_TYPE (field), ref);
1397 if (main_decl == NULL_TREE)
1404 /* Finish off the processing of a UNION_TYPE structure. If the union is an
1405 anonymous union, then all members must be laid out together. PUBLIC_P
1406 is nonzero if this union is not declared static. */
1409 finish_anon_union (tree anon_union_decl)
1415 if (anon_union_decl == error_mark_node)
1418 type = TREE_TYPE (anon_union_decl);
1419 public_p = TREE_PUBLIC (anon_union_decl);
1421 /* The VAR_DECL's context is the same as the TYPE's context. */
1422 DECL_CONTEXT (anon_union_decl) = DECL_CONTEXT (TYPE_NAME (type));
1424 if (TYPE_FIELDS (type) == NULL_TREE)
1429 error ("namespace-scope anonymous aggregates must be static");
1433 main_decl = build_anon_union_vars (type, anon_union_decl);
1434 if (main_decl == error_mark_node)
1436 if (main_decl == NULL_TREE)
1438 warning (0, "anonymous union with no members");
1442 if (!processing_template_decl)
1444 /* Use main_decl to set the mangled name. */
1445 DECL_NAME (anon_union_decl) = DECL_NAME (main_decl);
1446 maybe_commonize_var (anon_union_decl);
1447 if (TREE_STATIC (anon_union_decl) || DECL_EXTERNAL (anon_union_decl))
1448 mangle_decl (anon_union_decl);
1449 DECL_NAME (anon_union_decl) = NULL_TREE;
1452 pushdecl (anon_union_decl);
1453 if (building_stmt_list_p ()
1454 && at_function_scope_p ())
1455 add_decl_expr (anon_union_decl);
1456 else if (!processing_template_decl)
1457 rest_of_decl_compilation (anon_union_decl,
1458 toplevel_bindings_p (), at_eof);
1461 /* Auxiliary functions to make type signatures for
1462 `operator new' and `operator delete' correspond to
1463 what compiler will be expecting. */
1466 coerce_new_type (tree type)
1469 tree args = TYPE_ARG_TYPES (type);
1471 gcc_assert (TREE_CODE (type) == FUNCTION_TYPE);
1473 if (!same_type_p (TREE_TYPE (type), ptr_type_node))
1476 error ("%<operator new%> must return type %qT", ptr_type_node);
1479 if (args && args != void_list_node)
1481 if (TREE_PURPOSE (args))
1483 /* [basic.stc.dynamic.allocation]
1485 The first parameter shall not have an associated default
1487 error ("the first parameter of %<operator new%> cannot "
1488 "have a default argument");
1489 /* Throw away the default argument. */
1490 TREE_PURPOSE (args) = NULL_TREE;
1493 if (!same_type_p (TREE_VALUE (args), size_type_node))
1496 args = TREE_CHAIN (args);
1503 permerror (input_location, "%<operator new%> takes type %<size_t%> (%qT) "
1504 "as first parameter", size_type_node);
1509 args = tree_cons (NULL_TREE, size_type_node, args);
1512 type = build_exception_variant
1513 (build_function_type (ptr_type_node, args),
1514 TYPE_RAISES_EXCEPTIONS (type));
1522 coerce_delete_type (tree type)
1525 tree args = TYPE_ARG_TYPES (type);
1527 gcc_assert (TREE_CODE (type) == FUNCTION_TYPE);
1529 if (!same_type_p (TREE_TYPE (type), void_type_node))
1532 error ("%<operator delete%> must return type %qT", void_type_node);
1535 if (!args || args == void_list_node
1536 || !same_type_p (TREE_VALUE (args), ptr_type_node))
1539 if (args && args != void_list_node)
1540 args = TREE_CHAIN (args);
1541 error ("%<operator delete%> takes type %qT as first parameter",
1547 args = tree_cons (NULL_TREE, ptr_type_node, args);
1550 type = build_exception_variant
1551 (build_function_type (void_type_node, args),
1552 TYPE_RAISES_EXCEPTIONS (type));
1560 /* DECL is a VAR_DECL for a vtable: walk through the entries in the vtable
1561 and mark them as needed. */
1564 mark_vtable_entries (tree decl)
1567 unsigned HOST_WIDE_INT idx;
1569 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (DECL_INITIAL (decl)),
1574 STRIP_NOPS (fnaddr);
1576 if (TREE_CODE (fnaddr) != ADDR_EXPR
1577 && TREE_CODE (fnaddr) != FDESC_EXPR)
1578 /* This entry is an offset: a virtual base class offset, a
1579 virtual call offset, an RTTI offset, etc. */
1582 fn = TREE_OPERAND (fnaddr, 0);
1583 TREE_ADDRESSABLE (fn) = 1;
1584 /* When we don't have vcall offsets, we output thunks whenever
1585 we output the vtables that contain them. With vcall offsets,
1586 we know all the thunks we'll need when we emit a virtual
1587 function, so we emit the thunks there instead. */
1588 if (DECL_THUNK_P (fn))
1589 use_thunk (fn, /*emit_p=*/0);
1594 /* Set DECL up to have the closest approximation of "initialized common"
1595 linkage available. */
1598 comdat_linkage (tree decl)
1601 make_decl_one_only (decl, cxx_comdat_group (decl));
1602 else if (TREE_CODE (decl) == FUNCTION_DECL
1603 || (TREE_CODE (decl) == VAR_DECL && DECL_ARTIFICIAL (decl)))
1604 /* We can just emit function and compiler-generated variables
1605 statically; having multiple copies is (for the most part) only
1608 There are two correctness issues, however: the address of a
1609 template instantiation with external linkage should be the
1610 same, independent of what translation unit asks for the
1611 address, and this will not hold when we emit multiple copies of
1612 the function. However, there's little else we can do.
1614 Also, by default, the typeinfo implementation assumes that
1615 there will be only one copy of the string used as the name for
1616 each type. Therefore, if weak symbols are unavailable, the
1617 run-time library should perform a more conservative check; it
1618 should perform a string comparison, rather than an address
1620 TREE_PUBLIC (decl) = 0;
1623 /* Static data member template instantiations, however, cannot
1624 have multiple copies. */
1625 if (DECL_INITIAL (decl) == 0
1626 || DECL_INITIAL (decl) == error_mark_node)
1627 DECL_COMMON (decl) = 1;
1628 else if (EMPTY_CONSTRUCTOR_P (DECL_INITIAL (decl)))
1630 DECL_COMMON (decl) = 1;
1631 DECL_INITIAL (decl) = error_mark_node;
1633 else if (!DECL_EXPLICIT_INSTANTIATION (decl))
1635 /* We can't do anything useful; leave vars for explicit
1637 DECL_EXTERNAL (decl) = 1;
1638 DECL_NOT_REALLY_EXTERN (decl) = 0;
1642 DECL_COMDAT (decl) = 1;
1645 /* For win32 we also want to put explicit instantiations in
1646 linkonce sections, so that they will be merged with implicit
1647 instantiations; otherwise we get duplicate symbol errors.
1648 For Darwin we do not want explicit instantiations to be
1652 maybe_make_one_only (tree decl)
1654 /* We used to say that this was not necessary on targets that support weak
1655 symbols, because the implicit instantiations will defer to the explicit
1656 one. However, that's not actually the case in SVR4; a strong definition
1657 after a weak one is an error. Also, not making explicit
1658 instantiations one_only means that we can end up with two copies of
1659 some template instantiations. */
1663 /* We can't set DECL_COMDAT on functions, or cp_finish_file will think
1664 we can get away with not emitting them if they aren't used. We need
1665 to for variables so that cp_finish_decl will update their linkage,
1666 because their DECL_INITIAL may not have been set properly yet. */
1668 if (!TARGET_WEAK_NOT_IN_ARCHIVE_TOC
1669 || (! DECL_EXPLICIT_INSTANTIATION (decl)
1670 && ! DECL_TEMPLATE_SPECIALIZATION (decl)))
1672 make_decl_one_only (decl, cxx_comdat_group (decl));
1674 if (TREE_CODE (decl) == VAR_DECL)
1676 DECL_COMDAT (decl) = 1;
1677 /* Mark it needed so we don't forget to emit it. */
1678 mark_decl_referenced (decl);
1683 /* Returns true iff DECL, a FUNCTION_DECL or VAR_DECL, has vague linkage.
1684 This predicate will give the right answer during parsing of the
1685 function, which other tests may not. */
1688 vague_linkage_p (tree decl)
1690 /* Unfortunately, import_export_decl has not always been called
1691 before the function is processed, so we cannot simply check
1693 return (DECL_COMDAT (decl)
1694 || (((TREE_CODE (decl) == FUNCTION_DECL
1695 && DECL_DECLARED_INLINE_P (decl))
1696 || (DECL_LANG_SPECIFIC (decl)
1697 && DECL_TEMPLATE_INSTANTIATION (decl)))
1698 && TREE_PUBLIC (decl)));
1701 /* Determine whether or not we want to specifically import or export CTYPE,
1702 using various heuristics. */
1705 import_export_class (tree ctype)
1707 /* -1 for imported, 1 for exported. */
1708 int import_export = 0;
1710 /* It only makes sense to call this function at EOF. The reason is
1711 that this function looks at whether or not the first non-inline
1712 non-abstract virtual member function has been defined in this
1713 translation unit. But, we can't possibly know that until we've
1714 seen the entire translation unit. */
1715 gcc_assert (at_eof);
1717 if (CLASSTYPE_INTERFACE_KNOWN (ctype))
1720 /* If MULTIPLE_SYMBOL_SPACES is set and we saw a #pragma interface,
1721 we will have CLASSTYPE_INTERFACE_ONLY set but not
1722 CLASSTYPE_INTERFACE_KNOWN. In that case, we don't want to use this
1723 heuristic because someone will supply a #pragma implementation
1724 elsewhere, and deducing it here would produce a conflict. */
1725 if (CLASSTYPE_INTERFACE_ONLY (ctype))
1728 if (lookup_attribute ("dllimport", TYPE_ATTRIBUTES (ctype)))
1730 else if (lookup_attribute ("dllexport", TYPE_ATTRIBUTES (ctype)))
1732 else if (CLASSTYPE_IMPLICIT_INSTANTIATION (ctype)
1733 && !flag_implicit_templates)
1734 /* For a template class, without -fimplicit-templates, check the
1735 repository. If the virtual table is assigned to this
1736 translation unit, then export the class; otherwise, import
1738 import_export = repo_export_class_p (ctype) ? 1 : -1;
1739 else if (TYPE_POLYMORPHIC_P (ctype))
1741 /* The ABI specifies that the virtual table and associated
1742 information are emitted with the key method, if any. */
1743 tree method = CLASSTYPE_KEY_METHOD (ctype);
1744 /* If weak symbol support is not available, then we must be
1745 careful not to emit the vtable when the key function is
1746 inline. An inline function can be defined in multiple
1747 translation units. If we were to emit the vtable in each
1748 translation unit containing a definition, we would get
1749 multiple definition errors at link-time. */
1750 if (method && (flag_weak || ! DECL_DECLARED_INLINE_P (method)))
1751 import_export = (DECL_REALLY_EXTERN (method) ? -1 : 1);
1754 /* When MULTIPLE_SYMBOL_SPACES is set, we cannot count on seeing
1755 a definition anywhere else. */
1756 if (MULTIPLE_SYMBOL_SPACES && import_export == -1)
1759 /* Allow back ends the chance to overrule the decision. */
1760 if (targetm.cxx.import_export_class)
1761 import_export = targetm.cxx.import_export_class (ctype, import_export);
1765 SET_CLASSTYPE_INTERFACE_KNOWN (ctype);
1766 CLASSTYPE_INTERFACE_ONLY (ctype) = (import_export < 0);
1770 /* Return true if VAR has already been provided to the back end; in that
1771 case VAR should not be modified further by the front end. */
1773 var_finalized_p (tree var)
1775 return varpool_node (var)->finalized;
1778 /* DECL is a VAR_DECL or FUNCTION_DECL which, for whatever reason,
1779 must be emitted in this translation unit. Mark it as such. */
1782 mark_needed (tree decl)
1784 /* It's possible that we no longer need to set
1785 TREE_SYMBOL_REFERENCED here directly, but doing so is
1787 TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)) = 1;
1788 mark_decl_referenced (decl);
1791 /* DECL is either a FUNCTION_DECL or a VAR_DECL. This function
1792 returns true if a definition of this entity should be provided in
1793 this object file. Callers use this function to determine whether
1794 or not to let the back end know that a definition of DECL is
1795 available in this translation unit. */
1798 decl_needed_p (tree decl)
1800 gcc_assert (TREE_CODE (decl) == VAR_DECL
1801 || TREE_CODE (decl) == FUNCTION_DECL);
1802 /* This function should only be called at the end of the translation
1803 unit. We cannot be sure of whether or not something will be
1804 COMDAT until that point. */
1805 gcc_assert (at_eof);
1807 /* All entities with external linkage that are not COMDAT should be
1808 emitted; they may be referred to from other object files. */
1809 if (TREE_PUBLIC (decl) && !DECL_COMDAT (decl))
1811 /* If this entity was used, let the back end see it; it will decide
1812 whether or not to emit it into the object file. */
1813 if (TREE_USED (decl)
1814 || (DECL_ASSEMBLER_NAME_SET_P (decl)
1815 && TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))))
1817 /* Functions marked "dllexport" must be emitted so that they are
1818 visible to other DLLs. */
1819 if (flag_keep_inline_dllexport
1820 && lookup_attribute ("dllexport", DECL_ATTRIBUTES (decl)))
1822 /* Otherwise, DECL does not need to be emitted -- yet. A subsequent
1823 reference to DECL might cause it to be emitted later. */
1827 /* If necessary, write out the vtables for the dynamic class CTYPE.
1828 Returns true if any vtables were emitted. */
1831 maybe_emit_vtables (tree ctype)
1836 struct varpool_node *current = NULL, *last = NULL, *first = NULL;
1838 /* If the vtables for this class have already been emitted there is
1839 nothing more to do. */
1840 primary_vtbl = CLASSTYPE_VTABLES (ctype);
1841 if (var_finalized_p (primary_vtbl))
1843 /* Ignore dummy vtables made by get_vtable_decl. */
1844 if (TREE_TYPE (primary_vtbl) == void_type_node)
1847 /* On some targets, we cannot determine the key method until the end
1848 of the translation unit -- which is when this function is
1850 if (!targetm.cxx.key_method_may_be_inline ())
1851 determine_key_method (ctype);
1853 /* See if any of the vtables are needed. */
1854 for (vtbl = CLASSTYPE_VTABLES (ctype); vtbl; vtbl = DECL_CHAIN (vtbl))
1856 import_export_decl (vtbl);
1857 if (DECL_NOT_REALLY_EXTERN (vtbl) && decl_needed_p (vtbl))
1862 /* If the references to this class' vtables are optimized away,
1863 still emit the appropriate debugging information. See
1865 if (DECL_COMDAT (primary_vtbl)
1866 && CLASSTYPE_DEBUG_REQUESTED (ctype))
1867 note_debug_info_needed (ctype);
1871 /* The ABI requires that we emit all of the vtables if we emit any
1873 for (vtbl = CLASSTYPE_VTABLES (ctype); vtbl; vtbl = DECL_CHAIN (vtbl))
1875 /* Mark entities references from the virtual table as used. */
1876 mark_vtable_entries (vtbl);
1878 if (TREE_TYPE (DECL_INITIAL (vtbl)) == 0)
1880 VEC(tree,gc)* cleanups = NULL;
1881 tree expr = store_init_value (vtbl, DECL_INITIAL (vtbl), &cleanups,
1884 /* It had better be all done at compile-time. */
1885 gcc_assert (!expr && !cleanups);
1889 DECL_EXTERNAL (vtbl) = 0;
1890 rest_of_decl_compilation (vtbl, 1, 1);
1892 /* Because we're only doing syntax-checking, we'll never end up
1893 actually marking the variable as written. */
1894 if (flag_syntax_only)
1895 TREE_ASM_WRITTEN (vtbl) = 1;
1896 else if (DECL_COMDAT (vtbl))
1898 current = varpool_node (vtbl);
1900 last->same_comdat_group = current;
1908 last->same_comdat_group = first;
1910 /* Since we're writing out the vtable here, also write the debug
1912 note_debug_info_needed (ctype);
1917 /* A special return value from type_visibility meaning internal
1920 enum { VISIBILITY_ANON = VISIBILITY_INTERNAL+1 };
1922 /* walk_tree helper function for type_visibility. */
1925 min_vis_r (tree *tp, int *walk_subtrees, void *data)
1927 int *vis_p = (int *)data;
1932 else if (TAGGED_TYPE_P (*tp)
1933 && !TREE_PUBLIC (TYPE_MAIN_DECL (*tp)))
1935 *vis_p = VISIBILITY_ANON;
1938 else if (CLASS_TYPE_P (*tp)
1939 && CLASSTYPE_VISIBILITY (*tp) > *vis_p)
1940 *vis_p = CLASSTYPE_VISIBILITY (*tp);
1944 /* Returns the visibility of TYPE, which is the minimum visibility of its
1948 type_visibility (tree type)
1950 int vis = VISIBILITY_DEFAULT;
1951 cp_walk_tree_without_duplicates (&type, min_vis_r, &vis);
1955 /* Limit the visibility of DECL to VISIBILITY, if not explicitly
1956 specified (or if VISIBILITY is static). If TMPL is true, this
1957 constraint is for a template argument, and takes precedence
1958 over explicitly-specified visibility on the template. */
1961 constrain_visibility (tree decl, int visibility, bool tmpl)
1963 if (visibility == VISIBILITY_ANON)
1965 /* extern "C" declarations aren't affected by the anonymous
1967 if (!DECL_EXTERN_C_P (decl))
1969 TREE_PUBLIC (decl) = 0;
1970 DECL_WEAK (decl) = 0;
1971 DECL_COMMON (decl) = 0;
1972 DECL_COMDAT_GROUP (decl) = NULL_TREE;
1973 DECL_INTERFACE_KNOWN (decl) = 1;
1974 if (DECL_LANG_SPECIFIC (decl))
1975 DECL_NOT_REALLY_EXTERN (decl) = 1;
1978 else if (visibility > DECL_VISIBILITY (decl)
1979 && (tmpl || !DECL_VISIBILITY_SPECIFIED (decl)))
1981 DECL_VISIBILITY (decl) = (enum symbol_visibility) visibility;
1982 /* This visibility was not specified. */
1983 DECL_VISIBILITY_SPECIFIED (decl) = false;
1987 /* Constrain the visibility of DECL based on the visibility of its template
1991 constrain_visibility_for_template (tree decl, tree targs)
1993 /* If this is a template instantiation, check the innermost
1994 template args for visibility constraints. The outer template
1995 args are covered by the class check. */
1996 tree args = INNERMOST_TEMPLATE_ARGS (targs);
1998 for (i = TREE_VEC_LENGTH (args); i > 0; --i)
2002 tree arg = TREE_VEC_ELT (args, i-1);
2004 vis = type_visibility (arg);
2005 else if (TREE_TYPE (arg) && POINTER_TYPE_P (TREE_TYPE (arg)))
2008 if (TREE_CODE (arg) == ADDR_EXPR)
2009 arg = TREE_OPERAND (arg, 0);
2010 if (TREE_CODE (arg) == VAR_DECL
2011 || TREE_CODE (arg) == FUNCTION_DECL)
2013 if (! TREE_PUBLIC (arg))
2014 vis = VISIBILITY_ANON;
2016 vis = DECL_VISIBILITY (arg);
2020 constrain_visibility (decl, vis, true);
2024 /* Like c_determine_visibility, but with additional C++-specific
2027 Function-scope entities can rely on the function's visibility because
2028 it is set in start_preparsed_function.
2030 Class-scope entities cannot rely on the class's visibility until the end
2031 of the enclosing class definition.
2033 Note that because namespaces have multiple independent definitions,
2034 namespace visibility is handled elsewhere using the #pragma visibility
2035 machinery rather than by decorating the namespace declaration.
2037 The goal is for constraints from the type to give a diagnostic, and
2038 other constraints to be applied silently. */
2041 determine_visibility (tree decl)
2043 tree class_type = NULL_TREE;
2045 bool orig_visibility_specified;
2046 enum symbol_visibility orig_visibility;
2048 /* Remember that all decls get VISIBILITY_DEFAULT when built. */
2050 /* Only relevant for names with external linkage. */
2051 if (!TREE_PUBLIC (decl))
2054 /* Cloned constructors and destructors get the same visibility as
2055 the underlying function. That should be set up in
2056 maybe_clone_body. */
2057 gcc_assert (!DECL_CLONED_FUNCTION_P (decl));
2059 orig_visibility_specified = DECL_VISIBILITY_SPECIFIED (decl);
2060 orig_visibility = DECL_VISIBILITY (decl);
2062 if (TREE_CODE (decl) == TYPE_DECL)
2064 if (CLASS_TYPE_P (TREE_TYPE (decl)))
2065 use_template = CLASSTYPE_USE_TEMPLATE (TREE_TYPE (decl));
2066 else if (TYPE_TEMPLATE_INFO (TREE_TYPE (decl)))
2071 else if (DECL_LANG_SPECIFIC (decl))
2072 use_template = DECL_USE_TEMPLATE (decl);
2076 /* If DECL is a member of a class, visibility specifiers on the
2077 class can influence the visibility of the DECL. */
2078 if (DECL_CLASS_SCOPE_P (decl))
2079 class_type = DECL_CONTEXT (decl);
2082 /* Not a class member. */
2084 /* Virtual tables have DECL_CONTEXT set to their associated class,
2085 so they are automatically handled above. */
2086 gcc_assert (TREE_CODE (decl) != VAR_DECL
2087 || !DECL_VTABLE_OR_VTT_P (decl));
2089 if (DECL_FUNCTION_SCOPE_P (decl) && ! DECL_VISIBILITY_SPECIFIED (decl))
2091 /* Local statics and classes get the visibility of their
2092 containing function by default, except that
2093 -fvisibility-inlines-hidden doesn't affect them. */
2094 tree fn = DECL_CONTEXT (decl);
2095 if (DECL_VISIBILITY_SPECIFIED (fn))
2097 DECL_VISIBILITY (decl) = DECL_VISIBILITY (fn);
2098 DECL_VISIBILITY_SPECIFIED (decl) =
2099 DECL_VISIBILITY_SPECIFIED (fn);
2103 if (DECL_CLASS_SCOPE_P (fn))
2104 determine_visibility_from_class (decl, DECL_CONTEXT (fn));
2105 else if (determine_hidden_inline (fn))
2107 DECL_VISIBILITY (decl) = default_visibility;
2108 DECL_VISIBILITY_SPECIFIED (decl) =
2109 visibility_options.inpragma;
2113 DECL_VISIBILITY (decl) = DECL_VISIBILITY (fn);
2114 DECL_VISIBILITY_SPECIFIED (decl) =
2115 DECL_VISIBILITY_SPECIFIED (fn);
2119 /* Local classes in templates have CLASSTYPE_USE_TEMPLATE set,
2120 but have no TEMPLATE_INFO, so don't try to check it. */
2123 else if (TREE_CODE (decl) == VAR_DECL && DECL_TINFO_P (decl)
2124 && flag_visibility_ms_compat)
2126 /* Under -fvisibility-ms-compat, types are visible by default,
2127 even though their contents aren't. */
2128 tree underlying_type = TREE_TYPE (DECL_NAME (decl));
2129 int underlying_vis = type_visibility (underlying_type);
2130 if (underlying_vis == VISIBILITY_ANON
2131 || (CLASS_TYPE_P (underlying_type)
2132 && CLASSTYPE_VISIBILITY_SPECIFIED (underlying_type)))
2133 constrain_visibility (decl, underlying_vis, false);
2135 DECL_VISIBILITY (decl) = VISIBILITY_DEFAULT;
2137 else if (TREE_CODE (decl) == VAR_DECL && DECL_TINFO_P (decl))
2139 /* tinfo visibility is based on the type it's for. */
2140 constrain_visibility
2141 (decl, type_visibility (TREE_TYPE (DECL_NAME (decl))), false);
2143 /* Give the target a chance to override the visibility associated
2145 if (TREE_PUBLIC (decl)
2146 && !DECL_REALLY_EXTERN (decl)
2147 && CLASS_TYPE_P (TREE_TYPE (DECL_NAME (decl)))
2148 && !CLASSTYPE_VISIBILITY_SPECIFIED (TREE_TYPE (DECL_NAME (decl))))
2149 targetm.cxx.determine_class_data_visibility (decl);
2151 else if (use_template)
2152 /* Template instantiations and specializations get visibility based
2153 on their template unless they override it with an attribute. */;
2154 else if (! DECL_VISIBILITY_SPECIFIED (decl))
2156 if (determine_hidden_inline (decl))
2157 DECL_VISIBILITY (decl) = VISIBILITY_HIDDEN;
2160 /* Set default visibility to whatever the user supplied with
2161 #pragma GCC visibility or a namespace visibility attribute. */
2162 DECL_VISIBILITY (decl) = default_visibility;
2163 DECL_VISIBILITY_SPECIFIED (decl) = visibility_options.inpragma;
2170 /* If the specialization doesn't specify visibility, use the
2171 visibility from the template. */
2172 tree tinfo = (TREE_CODE (decl) == TYPE_DECL
2173 ? TYPE_TEMPLATE_INFO (TREE_TYPE (decl))
2174 : DECL_TEMPLATE_INFO (decl));
2175 tree args = TI_ARGS (tinfo);
2176 tree attribs = (TREE_CODE (decl) == TYPE_DECL
2177 ? TYPE_ATTRIBUTES (TREE_TYPE (decl))
2178 : DECL_ATTRIBUTES (decl));
2180 if (args != error_mark_node
2181 /* Template argument visibility outweighs #pragma or namespace
2182 visibility, but not an explicit attribute. */
2183 && !lookup_attribute ("visibility", attribs))
2185 int depth = TMPL_ARGS_DEPTH (args);
2186 tree pattern = DECL_TEMPLATE_RESULT (TI_TEMPLATE (tinfo));
2188 if (!DECL_VISIBILITY_SPECIFIED (decl))
2190 if (!DECL_VISIBILITY_SPECIFIED (pattern)
2191 && determine_hidden_inline (decl))
2192 DECL_VISIBILITY (decl) = VISIBILITY_HIDDEN;
2195 DECL_VISIBILITY (decl) = DECL_VISIBILITY (pattern);
2196 DECL_VISIBILITY_SPECIFIED (decl)
2197 = DECL_VISIBILITY_SPECIFIED (pattern);
2201 /* FIXME should TMPL_ARGS_DEPTH really return 1 for null input? */
2202 if (args && depth > template_class_depth (class_type))
2203 /* Limit visibility based on its template arguments. */
2204 constrain_visibility_for_template (decl, args);
2209 determine_visibility_from_class (decl, class_type);
2211 if (decl_anon_ns_mem_p (decl))
2212 /* Names in an anonymous namespace get internal linkage.
2213 This might change once we implement export. */
2214 constrain_visibility (decl, VISIBILITY_ANON, false);
2215 else if (TREE_CODE (decl) != TYPE_DECL)
2217 /* Propagate anonymity from type to decl. */
2218 int tvis = type_visibility (TREE_TYPE (decl));
2219 if (tvis == VISIBILITY_ANON
2220 || ! DECL_VISIBILITY_SPECIFIED (decl))
2221 constrain_visibility (decl, tvis, false);
2223 else if (no_linkage_check (TREE_TYPE (decl), /*relaxed_p=*/true))
2224 /* DR 757: A type without linkage shall not be used as the type of a
2225 variable or function with linkage, unless
2226 o the variable or function has extern "C" linkage (7.5 [dcl.link]), or
2227 o the variable or function is not used (3.2 [basic.def.odr]) or is
2228 defined in the same translation unit.
2230 Since non-extern "C" decls need to be defined in the same
2231 translation unit, we can make the type internal. */
2232 constrain_visibility (decl, VISIBILITY_ANON, false);
2234 /* If visibility changed and DECL already has DECL_RTL, ensure
2235 symbol flags are updated. */
2236 if ((DECL_VISIBILITY (decl) != orig_visibility
2237 || DECL_VISIBILITY_SPECIFIED (decl) != orig_visibility_specified)
2238 && ((TREE_CODE (decl) == VAR_DECL && TREE_STATIC (decl))
2239 || TREE_CODE (decl) == FUNCTION_DECL)
2240 && DECL_RTL_SET_P (decl))
2241 make_decl_rtl (decl);
2244 /* By default, static data members and function members receive
2245 the visibility of their containing class. */
2248 determine_visibility_from_class (tree decl, tree class_type)
2250 if (DECL_VISIBILITY_SPECIFIED (decl))
2253 if (determine_hidden_inline (decl))
2254 DECL_VISIBILITY (decl) = VISIBILITY_HIDDEN;
2257 /* Default to the class visibility. */
2258 DECL_VISIBILITY (decl) = CLASSTYPE_VISIBILITY (class_type);
2259 DECL_VISIBILITY_SPECIFIED (decl)
2260 = CLASSTYPE_VISIBILITY_SPECIFIED (class_type);
2263 /* Give the target a chance to override the visibility associated
2265 if (TREE_CODE (decl) == VAR_DECL
2266 && (DECL_TINFO_P (decl)
2267 || (DECL_VTABLE_OR_VTT_P (decl)
2268 /* Construction virtual tables are not exported because
2269 they cannot be referred to from other object files;
2270 their name is not standardized by the ABI. */
2271 && !DECL_CONSTRUCTION_VTABLE_P (decl)))
2272 && TREE_PUBLIC (decl)
2273 && !DECL_REALLY_EXTERN (decl)
2274 && !CLASSTYPE_VISIBILITY_SPECIFIED (class_type))
2275 targetm.cxx.determine_class_data_visibility (decl);
2278 /* Returns true iff DECL is an inline that should get hidden visibility
2279 because of -fvisibility-inlines-hidden. */
2282 determine_hidden_inline (tree decl)
2284 return (visibility_options.inlines_hidden
2285 /* Don't do this for inline templates; specializations might not be
2286 inline, and we don't want them to inherit the hidden
2287 visibility. We'll set it here for all inline instantiations. */
2288 && !processing_template_decl
2289 && TREE_CODE (decl) == FUNCTION_DECL
2290 && DECL_DECLARED_INLINE_P (decl)
2291 && (! DECL_LANG_SPECIFIC (decl)
2292 || ! DECL_EXPLICIT_INSTANTIATION (decl)));
2295 /* Constrain the visibility of a class TYPE based on the visibility of its
2296 field types. Warn if any fields require lesser visibility. */
2299 constrain_class_visibility (tree type)
2305 int vis = type_visibility (type);
2307 if (vis == VISIBILITY_ANON
2308 || DECL_IN_SYSTEM_HEADER (TYPE_MAIN_DECL (type)))
2311 /* Don't warn about visibility if the class has explicit visibility. */
2312 if (CLASSTYPE_VISIBILITY_SPECIFIED (type))
2313 vis = VISIBILITY_INTERNAL;
2315 for (t = TYPE_FIELDS (type); t; t = DECL_CHAIN (t))
2316 if (TREE_CODE (t) == FIELD_DECL && TREE_TYPE (t) != error_mark_node)
2318 tree ftype = strip_pointer_or_array_types (TREE_TYPE (t));
2319 int subvis = type_visibility (ftype);
2321 if (subvis == VISIBILITY_ANON)
2323 if (!in_main_input_context ())
2325 %qT has a field %qD whose type uses the anonymous namespace",
2328 else if (MAYBE_CLASS_TYPE_P (ftype)
2329 && vis < VISIBILITY_HIDDEN
2330 && subvis >= VISIBILITY_HIDDEN)
2331 warning (OPT_Wattributes, "\
2332 %qT declared with greater visibility than the type of its field %qD",
2336 binfo = TYPE_BINFO (type);
2337 for (i = 0; BINFO_BASE_ITERATE (binfo, i, t); ++i)
2339 int subvis = type_visibility (TREE_TYPE (t));
2341 if (subvis == VISIBILITY_ANON)
2343 if (!in_main_input_context())
2345 %qT has a base %qT whose type uses the anonymous namespace",
2346 type, TREE_TYPE (t));
2348 else if (vis < VISIBILITY_HIDDEN
2349 && subvis >= VISIBILITY_HIDDEN)
2350 warning (OPT_Wattributes, "\
2351 %qT declared with greater visibility than its base %qT",
2352 type, TREE_TYPE (t));
2356 /* DECL is a FUNCTION_DECL or VAR_DECL. If the object file linkage
2357 for DECL has not already been determined, do so now by setting
2358 DECL_EXTERNAL, DECL_COMDAT and other related flags. Until this
2359 function is called entities with vague linkage whose definitions
2360 are available must have TREE_PUBLIC set.
2362 If this function decides to place DECL in COMDAT, it will set
2363 appropriate flags -- but will not clear DECL_EXTERNAL. It is up to
2364 the caller to decide whether or not to clear DECL_EXTERNAL. Some
2365 callers defer that decision until it is clear that DECL is actually
2369 import_export_decl (tree decl)
2374 tree class_type = NULL_TREE;
2376 if (DECL_INTERFACE_KNOWN (decl))
2379 /* We cannot determine what linkage to give to an entity with vague
2380 linkage until the end of the file. For example, a virtual table
2381 for a class will be defined if and only if the key method is
2382 defined in this translation unit. As a further example, consider
2383 that when compiling a translation unit that uses PCH file with
2384 "-frepo" it would be incorrect to make decisions about what
2385 entities to emit when building the PCH; those decisions must be
2386 delayed until the repository information has been processed. */
2387 gcc_assert (at_eof);
2388 /* Object file linkage for explicit instantiations is handled in
2389 mark_decl_instantiated. For static variables in functions with
2390 vague linkage, maybe_commonize_var is used.
2392 Therefore, the only declarations that should be provided to this
2393 function are those with external linkage that are:
2395 * implicit instantiations of function templates
2399 * implicit instantiations of static data members of class
2406 Furthermore, all entities that reach this point must have a
2407 definition available in this translation unit.
2409 The following assertions check these conditions. */
2410 gcc_assert (TREE_CODE (decl) == FUNCTION_DECL
2411 || TREE_CODE (decl) == VAR_DECL);
2412 /* Any code that creates entities with TREE_PUBLIC cleared should
2413 also set DECL_INTERFACE_KNOWN. */
2414 gcc_assert (TREE_PUBLIC (decl));
2415 if (TREE_CODE (decl) == FUNCTION_DECL)
2416 gcc_assert (DECL_IMPLICIT_INSTANTIATION (decl)
2417 || DECL_FRIEND_PSEUDO_TEMPLATE_INSTANTIATION (decl)
2418 || DECL_DECLARED_INLINE_P (decl));
2420 gcc_assert (DECL_IMPLICIT_INSTANTIATION (decl)
2421 || DECL_VTABLE_OR_VTT_P (decl)
2422 || DECL_TINFO_P (decl));
2423 /* Check that a definition of DECL is available in this translation
2425 gcc_assert (!DECL_REALLY_EXTERN (decl));
2427 /* Assume that DECL will not have COMDAT linkage. */
2429 /* Assume that DECL will not be imported into this translation
2433 /* See if the repository tells us whether or not to emit DECL in
2434 this translation unit. */
2435 emit_p = repo_emit_p (decl);
2438 else if (emit_p == 1)
2440 /* The repository indicates that this entity should be defined
2441 here. Make sure the back end honors that request. */
2442 if (TREE_CODE (decl) == VAR_DECL)
2444 else if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (decl)
2445 || DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P (decl))
2448 FOR_EACH_CLONE (clone, decl)
2449 mark_needed (clone);
2453 /* Output the definition as an ordinary strong definition. */
2454 DECL_EXTERNAL (decl) = 0;
2455 DECL_INTERFACE_KNOWN (decl) = 1;
2460 /* We have already decided what to do with this DECL; there is no
2461 need to check anything further. */
2463 else if (TREE_CODE (decl) == VAR_DECL && DECL_VTABLE_OR_VTT_P (decl))
2465 class_type = DECL_CONTEXT (decl);
2466 import_export_class (class_type);
2467 if (TYPE_FOR_JAVA (class_type))
2469 else if (CLASSTYPE_INTERFACE_KNOWN (class_type)
2470 && CLASSTYPE_INTERFACE_ONLY (class_type))
2472 else if ((!flag_weak || TARGET_WEAK_NOT_IN_ARCHIVE_TOC)
2473 && !CLASSTYPE_USE_TEMPLATE (class_type)
2474 && CLASSTYPE_KEY_METHOD (class_type)
2475 && !DECL_DECLARED_INLINE_P (CLASSTYPE_KEY_METHOD (class_type)))
2476 /* The ABI requires that all virtual tables be emitted with
2477 COMDAT linkage. However, on systems where COMDAT symbols
2478 don't show up in the table of contents for a static
2479 archive, or on systems without weak symbols (where we
2480 approximate COMDAT linkage by using internal linkage), the
2481 linker will report errors about undefined symbols because
2482 it will not see the virtual table definition. Therefore,
2483 in the case that we know that the virtual table will be
2484 emitted in only one translation unit, we make the virtual
2485 table an ordinary definition with external linkage. */
2486 DECL_EXTERNAL (decl) = 0;
2487 else if (CLASSTYPE_INTERFACE_KNOWN (class_type))
2489 /* CLASS_TYPE is being exported from this translation unit,
2490 so DECL should be defined here. */
2491 if (!flag_weak && CLASSTYPE_EXPLICIT_INSTANTIATION (class_type))
2492 /* If a class is declared in a header with the "extern
2493 template" extension, then it will not be instantiated,
2494 even in translation units that would normally require
2495 it. Often such classes are explicitly instantiated in
2496 one translation unit. Therefore, the explicit
2497 instantiation must be made visible to other translation
2499 DECL_EXTERNAL (decl) = 0;
2502 /* The generic C++ ABI says that class data is always
2503 COMDAT, even if there is a key function. Some
2504 variants (e.g., the ARM EABI) says that class data
2505 only has COMDAT linkage if the class data might be
2506 emitted in more than one translation unit. When the
2507 key method can be inline and is inline, we still have
2508 to arrange for comdat even though
2509 class_data_always_comdat is false. */
2510 if (!CLASSTYPE_KEY_METHOD (class_type)
2511 || DECL_DECLARED_INLINE_P (CLASSTYPE_KEY_METHOD (class_type))
2512 || targetm.cxx.class_data_always_comdat ())
2514 /* The ABI requires COMDAT linkage. Normally, we
2515 only emit COMDAT things when they are needed;
2516 make sure that we realize that this entity is
2523 else if (!flag_implicit_templates
2524 && CLASSTYPE_IMPLICIT_INSTANTIATION (class_type))
2529 else if (TREE_CODE (decl) == VAR_DECL && DECL_TINFO_P (decl))
2531 tree type = TREE_TYPE (DECL_NAME (decl));
2532 if (CLASS_TYPE_P (type))
2535 import_export_class (type);
2536 if (CLASSTYPE_INTERFACE_KNOWN (type)
2537 && TYPE_POLYMORPHIC_P (type)
2538 && CLASSTYPE_INTERFACE_ONLY (type)
2539 /* If -fno-rtti was specified, then we cannot be sure
2540 that RTTI information will be emitted with the
2541 virtual table of the class, so we must emit it
2542 wherever it is used. */
2547 if (CLASSTYPE_INTERFACE_KNOWN (type)
2548 && !CLASSTYPE_INTERFACE_ONLY (type))
2550 comdat_p = (targetm.cxx.class_data_always_comdat ()
2551 || (CLASSTYPE_KEY_METHOD (type)
2552 && DECL_DECLARED_INLINE_P (CLASSTYPE_KEY_METHOD (type))));
2557 DECL_EXTERNAL (decl) = 0;
2567 else if (DECL_TEMPLATE_INSTANTIATION (decl)
2568 || DECL_FRIEND_PSEUDO_TEMPLATE_INSTANTIATION (decl))
2570 /* DECL is an implicit instantiation of a function or static
2572 if ((flag_implicit_templates
2573 && !flag_use_repository)
2574 || (flag_implicit_inline_templates
2575 && TREE_CODE (decl) == FUNCTION_DECL
2576 && DECL_DECLARED_INLINE_P (decl)))
2579 /* If we are not implicitly generating templates, then mark
2580 this entity as undefined in this translation unit. */
2583 else if (DECL_FUNCTION_MEMBER_P (decl))
2585 if (!DECL_DECLARED_INLINE_P (decl))
2587 tree ctype = DECL_CONTEXT (decl);
2588 import_export_class (ctype);
2589 if (CLASSTYPE_INTERFACE_KNOWN (ctype))
2591 DECL_NOT_REALLY_EXTERN (decl)
2592 = ! (CLASSTYPE_INTERFACE_ONLY (ctype)
2593 || (DECL_DECLARED_INLINE_P (decl)
2594 && ! flag_implement_inlines
2595 && !DECL_VINDEX (decl)));
2597 if (!DECL_NOT_REALLY_EXTERN (decl))
2598 DECL_EXTERNAL (decl) = 1;
2600 /* Always make artificials weak. */
2601 if (DECL_ARTIFICIAL (decl) && flag_weak)
2604 maybe_make_one_only (decl);
2615 /* If we are importing DECL into this translation unit, mark is
2616 an undefined here. */
2617 DECL_EXTERNAL (decl) = 1;
2618 DECL_NOT_REALLY_EXTERN (decl) = 0;
2622 /* If we decided to put DECL in COMDAT, mark it accordingly at
2624 comdat_linkage (decl);
2627 DECL_INTERFACE_KNOWN (decl) = 1;
2630 /* Return an expression that performs the destruction of DECL, which
2631 must be a VAR_DECL whose type has a non-trivial destructor, or is
2632 an array whose (innermost) elements have a non-trivial destructor. */
2635 build_cleanup (tree decl)
2638 tree type = TREE_TYPE (decl);
2640 /* This function should only be called for declarations that really
2641 require cleanups. */
2642 gcc_assert (!TYPE_HAS_TRIVIAL_DESTRUCTOR (type));
2644 /* Treat all objects with destructors as used; the destructor may do
2645 something substantive. */
2648 if (TREE_CODE (type) == ARRAY_TYPE)
2651 temp = build_address (decl);
2652 temp = build_delete (TREE_TYPE (temp), temp,
2653 sfk_complete_destructor,
2654 LOOKUP_NORMAL|LOOKUP_NONVIRTUAL|LOOKUP_DESTRUCTOR, 0,
2655 tf_warning_or_error);
2659 /* Returns the initialization guard variable for the variable DECL,
2660 which has static storage duration. */
2663 get_guard (tree decl)
2668 sname = mangle_guard_variable (decl);
2669 guard = IDENTIFIER_GLOBAL_VALUE (sname);
2674 /* We use a type that is big enough to contain a mutex as well
2675 as an integer counter. */
2676 guard_type = targetm.cxx.guard_type ();
2677 guard = build_decl (DECL_SOURCE_LOCATION (decl),
2678 VAR_DECL, sname, guard_type);
2680 /* The guard should have the same linkage as what it guards. */
2681 TREE_PUBLIC (guard) = TREE_PUBLIC (decl);
2682 TREE_STATIC (guard) = TREE_STATIC (decl);
2683 DECL_COMMON (guard) = DECL_COMMON (decl);
2684 DECL_COMDAT (guard) = DECL_COMDAT (decl);
2685 if (DECL_ONE_ONLY (decl))
2686 make_decl_one_only (guard, cxx_comdat_group (guard));
2687 if (TREE_PUBLIC (decl))
2688 DECL_WEAK (guard) = DECL_WEAK (decl);
2689 DECL_VISIBILITY (guard) = DECL_VISIBILITY (decl);
2690 DECL_VISIBILITY_SPECIFIED (guard) = DECL_VISIBILITY_SPECIFIED (decl);
2692 DECL_ARTIFICIAL (guard) = 1;
2693 DECL_IGNORED_P (guard) = 1;
2694 TREE_USED (guard) = 1;
2695 pushdecl_top_level_and_finish (guard, NULL_TREE);
2700 /* Return those bits of the GUARD variable that should be set when the
2701 guarded entity is actually initialized. */
2704 get_guard_bits (tree guard)
2706 if (!targetm.cxx.guard_mask_bit ())
2708 /* We only set the first byte of the guard, in order to leave room
2709 for a mutex in the high-order bits. */
2710 guard = build1 (ADDR_EXPR,
2711 build_pointer_type (TREE_TYPE (guard)),
2713 guard = build1 (NOP_EXPR,
2714 build_pointer_type (char_type_node),
2716 guard = build1 (INDIRECT_REF, char_type_node, guard);
2722 /* Return an expression which determines whether or not the GUARD
2723 variable has already been initialized. */
2726 get_guard_cond (tree guard)
2730 /* Check to see if the GUARD is zero. */
2731 guard = get_guard_bits (guard);
2733 /* Mask off all but the low bit. */
2734 if (targetm.cxx.guard_mask_bit ())
2736 guard_value = integer_one_node;
2737 if (!same_type_p (TREE_TYPE (guard_value), TREE_TYPE (guard)))
2738 guard_value = convert (TREE_TYPE (guard), guard_value);
2739 guard = cp_build_binary_op (input_location,
2740 BIT_AND_EXPR, guard, guard_value,
2741 tf_warning_or_error);
2744 guard_value = integer_zero_node;
2745 if (!same_type_p (TREE_TYPE (guard_value), TREE_TYPE (guard)))
2746 guard_value = convert (TREE_TYPE (guard), guard_value);
2747 return cp_build_binary_op (input_location,
2748 EQ_EXPR, guard, guard_value,
2749 tf_warning_or_error);
2752 /* Return an expression which sets the GUARD variable, indicating that
2753 the variable being guarded has been initialized. */
2756 set_guard (tree guard)
2760 /* Set the GUARD to one. */
2761 guard = get_guard_bits (guard);
2762 guard_init = integer_one_node;
2763 if (!same_type_p (TREE_TYPE (guard_init), TREE_TYPE (guard)))
2764 guard_init = convert (TREE_TYPE (guard), guard_init);
2765 return cp_build_modify_expr (guard, NOP_EXPR, guard_init,
2766 tf_warning_or_error);
2769 /* Start the process of running a particular set of global constructors
2770 or destructors. Subroutine of do_[cd]tors. */
2773 start_objects (int method_type, int initp)
2779 /* Make ctor or dtor function. METHOD_TYPE may be 'I' or 'D'. */
2781 if (initp != DEFAULT_INIT_PRIORITY)
2791 sprintf (type, "sub_%c%c%.5u", method_type, joiner, initp);
2794 sprintf (type, "sub_%c", method_type);
2796 fndecl = build_lang_decl (FUNCTION_DECL,
2797 get_file_function_name (type),
2798 build_function_type_list (void_type_node,
2800 start_preparsed_function (fndecl, /*attrs=*/NULL_TREE, SF_PRE_PARSED);
2802 TREE_PUBLIC (current_function_decl) = 0;
2804 /* Mark as artificial because it's not explicitly in the user's
2806 DECL_ARTIFICIAL (current_function_decl) = 1;
2808 /* Mark this declaration as used to avoid spurious warnings. */
2809 TREE_USED (current_function_decl) = 1;
2811 /* Mark this function as a global constructor or destructor. */
2812 if (method_type == 'I')
2813 DECL_GLOBAL_CTOR_P (current_function_decl) = 1;
2815 DECL_GLOBAL_DTOR_P (current_function_decl) = 1;
2817 body = begin_compound_stmt (BCS_FN_BODY);
2822 /* Finish the process of running a particular set of global constructors
2823 or destructors. Subroutine of do_[cd]tors. */
2826 finish_objects (int method_type, int initp, tree body)
2831 finish_compound_stmt (body);
2832 fn = finish_function (0);
2834 if (method_type == 'I')
2836 DECL_STATIC_CONSTRUCTOR (fn) = 1;
2837 decl_init_priority_insert (fn, initp);
2841 DECL_STATIC_DESTRUCTOR (fn) = 1;
2842 decl_fini_priority_insert (fn, initp);
2845 expand_or_defer_fn (fn);
2848 /* The names of the parameters to the function created to handle
2849 initializations and destructions for objects with static storage
2851 #define INITIALIZE_P_IDENTIFIER "__initialize_p"
2852 #define PRIORITY_IDENTIFIER "__priority"
2854 /* The name of the function we create to handle initializations and
2855 destructions for objects with static storage duration. */
2856 #define SSDF_IDENTIFIER "__static_initialization_and_destruction"
2858 /* The declaration for the __INITIALIZE_P argument. */
2859 static GTY(()) tree initialize_p_decl;
2861 /* The declaration for the __PRIORITY argument. */
2862 static GTY(()) tree priority_decl;
2864 /* The declaration for the static storage duration function. */
2865 static GTY(()) tree ssdf_decl;
2867 /* All the static storage duration functions created in this
2868 translation unit. */
2869 static GTY(()) VEC(tree,gc) *ssdf_decls;
2871 /* A map from priority levels to information about that priority
2872 level. There may be many such levels, so efficient lookup is
2874 static splay_tree priority_info_map;
2876 /* Begins the generation of the function that will handle all
2877 initialization and destruction of objects with static storage
2878 duration. The function generated takes two parameters of type
2879 `int': __INITIALIZE_P and __PRIORITY. If __INITIALIZE_P is
2880 nonzero, it performs initializations. Otherwise, it performs
2881 destructions. It only performs those initializations or
2882 destructions with the indicated __PRIORITY. The generated function
2885 It is assumed that this function will only be called once per
2886 translation unit. */
2889 start_static_storage_duration_function (unsigned count)
2893 char id[sizeof (SSDF_IDENTIFIER) + 1 /* '\0' */ + 32];
2895 /* Create the identifier for this function. It will be of the form
2896 SSDF_IDENTIFIER_<number>. */
2897 sprintf (id, "%s_%u", SSDF_IDENTIFIER, count);
2899 type = build_function_type_list (void_type_node,
2900 integer_type_node, integer_type_node,
2903 /* Create the FUNCTION_DECL itself. */
2904 ssdf_decl = build_lang_decl (FUNCTION_DECL,
2905 get_identifier (id),
2907 TREE_PUBLIC (ssdf_decl) = 0;
2908 DECL_ARTIFICIAL (ssdf_decl) = 1;
2910 /* Put this function in the list of functions to be called from the
2911 static constructors and destructors. */
2914 ssdf_decls = VEC_alloc (tree, gc, 32);
2916 /* Take this opportunity to initialize the map from priority
2917 numbers to information about that priority level. */
2918 priority_info_map = splay_tree_new (splay_tree_compare_ints,
2919 /*delete_key_fn=*/0,
2920 /*delete_value_fn=*/
2921 (splay_tree_delete_value_fn) &free);
2923 /* We always need to generate functions for the
2924 DEFAULT_INIT_PRIORITY so enter it now. That way when we walk
2925 priorities later, we'll be sure to find the
2926 DEFAULT_INIT_PRIORITY. */
2927 get_priority_info (DEFAULT_INIT_PRIORITY);
2930 VEC_safe_push (tree, gc, ssdf_decls, ssdf_decl);
2932 /* Create the argument list. */
2933 initialize_p_decl = cp_build_parm_decl
2934 (get_identifier (INITIALIZE_P_IDENTIFIER), integer_type_node);
2935 DECL_CONTEXT (initialize_p_decl) = ssdf_decl;
2936 TREE_USED (initialize_p_decl) = 1;
2937 priority_decl = cp_build_parm_decl
2938 (get_identifier (PRIORITY_IDENTIFIER), integer_type_node);
2939 DECL_CONTEXT (priority_decl) = ssdf_decl;
2940 TREE_USED (priority_decl) = 1;
2942 DECL_CHAIN (initialize_p_decl) = priority_decl;
2943 DECL_ARGUMENTS (ssdf_decl) = initialize_p_decl;
2945 /* Put the function in the global scope. */
2946 pushdecl (ssdf_decl);
2948 /* Start the function itself. This is equivalent to declaring the
2951 static void __ssdf (int __initialize_p, init __priority_p);
2953 It is static because we only need to call this function from the
2954 various constructor and destructor functions for this module. */
2955 start_preparsed_function (ssdf_decl,
2956 /*attrs=*/NULL_TREE,
2959 /* Set up the scope of the outermost block in the function. */
2960 body = begin_compound_stmt (BCS_FN_BODY);
2965 /* Finish the generation of the function which performs initialization
2966 and destruction of objects with static storage duration. After
2967 this point, no more such objects can be created. */
2970 finish_static_storage_duration_function (tree body)
2972 /* Close out the function. */
2973 finish_compound_stmt (body);
2974 expand_or_defer_fn (finish_function (0));
2977 /* Return the information about the indicated PRIORITY level. If no
2978 code to handle this level has yet been generated, generate the
2979 appropriate prologue. */
2981 static priority_info
2982 get_priority_info (int priority)
2987 n = splay_tree_lookup (priority_info_map,
2988 (splay_tree_key) priority);
2991 /* Create a new priority information structure, and insert it
2993 pi = XNEW (struct priority_info_s);
2994 pi->initializations_p = 0;
2995 pi->destructions_p = 0;
2996 splay_tree_insert (priority_info_map,
2997 (splay_tree_key) priority,
2998 (splay_tree_value) pi);
3001 pi = (priority_info) n->value;
3006 /* The effective initialization priority of a DECL. */
3008 #define DECL_EFFECTIVE_INIT_PRIORITY(decl) \
3009 ((!DECL_HAS_INIT_PRIORITY_P (decl) || DECL_INIT_PRIORITY (decl) == 0) \
3010 ? DEFAULT_INIT_PRIORITY : DECL_INIT_PRIORITY (decl))
3012 /* Whether a DECL needs a guard to protect it against multiple
3015 #define NEEDS_GUARD_P(decl) (TREE_PUBLIC (decl) && (DECL_COMMON (decl) \
3016 || DECL_ONE_ONLY (decl) \
3017 || DECL_WEAK (decl)))
3019 /* Called from one_static_initialization_or_destruction(),
3021 Walks the initializer list of a global variable and looks for
3022 temporary variables (DECL_NAME() == NULL and DECL_ARTIFICIAL != 0)
3023 and that have their DECL_CONTEXT() == NULL.
3024 For each such temporary variable, set their DECL_CONTEXT() to
3025 the current function. This is necessary because otherwise
3026 some optimizers (enabled by -O2 -fprofile-arcs) might crash
3027 when trying to refer to a temporary variable that does not have
3028 it's DECL_CONTECT() properly set. */
3030 fix_temporary_vars_context_r (tree *node,
3031 int *unused ATTRIBUTE_UNUSED,
3032 void *unused1 ATTRIBUTE_UNUSED)
3034 gcc_assert (current_function_decl);
3036 if (TREE_CODE (*node) == BIND_EXPR)
3040 for (var = BIND_EXPR_VARS (*node); var; var = DECL_CHAIN (var))
3041 if (TREE_CODE (var) == VAR_DECL
3043 && DECL_ARTIFICIAL (var)
3044 && !DECL_CONTEXT (var))
3045 DECL_CONTEXT (var) = current_function_decl;
3051 /* Set up to handle the initialization or destruction of DECL. If
3052 INITP is nonzero, we are initializing the variable. Otherwise, we
3053 are destroying it. */
3056 one_static_initialization_or_destruction (tree decl, tree init, bool initp)
3058 tree guard_if_stmt = NULL_TREE;
3061 /* If we are supposed to destruct and there's a trivial destructor,
3062 nothing has to be done. */
3064 && TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
3067 /* Trick the compiler into thinking we are at the file and line
3068 where DECL was declared so that error-messages make sense, and so
3069 that the debugger will show somewhat sensible file and line
3071 input_location = DECL_SOURCE_LOCATION (decl);
3073 /* Make sure temporary variables in the initialiser all have
3074 their DECL_CONTEXT() set to a value different from NULL_TREE.
3075 This can happen when global variables initialisers are built.
3076 In that case, the DECL_CONTEXT() of the global variables _AND_ of all
3077 the temporary variables that might have been generated in the
3078 accompagning initialisers is NULL_TREE, meaning the variables have been
3079 declared in the global namespace.
3080 What we want to do here is to fix that and make sure the DECL_CONTEXT()
3081 of the temporaries are set to the current function decl. */
3082 cp_walk_tree_without_duplicates (&init,
3083 fix_temporary_vars_context_r,
3090 Access control for implicit calls to the constructors,
3091 the conversion functions, or the destructor called to
3092 create and destroy a static data member is performed as
3093 if these calls appeared in the scope of the member's
3096 we pretend we are in a static member function of the class of
3097 which the DECL is a member. */
3098 if (member_p (decl))
3100 DECL_CONTEXT (current_function_decl) = DECL_CONTEXT (decl);
3101 DECL_STATIC_FUNCTION_P (current_function_decl) = 1;
3104 /* Assume we don't need a guard. */
3106 /* We need a guard if this is an object with external linkage that
3107 might be initialized in more than one place. (For example, a
3108 static data member of a template, when the data member requires
3110 if (NEEDS_GUARD_P (decl))
3114 guard = get_guard (decl);
3116 /* When using __cxa_atexit, we just check the GUARD as we would
3117 for a local static. */
3118 if (flag_use_cxa_atexit)
3120 /* When using __cxa_atexit, we never try to destroy
3121 anything from a static destructor. */
3123 guard_cond = get_guard_cond (guard);
3125 /* If we don't have __cxa_atexit, then we will be running
3126 destructors from .fini sections, or their equivalents. So,
3127 we need to know how many times we've tried to initialize this
3128 object. We do initializations only if the GUARD is zero,
3129 i.e., if we are the first to initialize the variable. We do
3130 destructions only if the GUARD is one, i.e., if we are the
3131 last to destroy the variable. */
3134 = cp_build_binary_op (input_location,
3136 cp_build_unary_op (PREINCREMENT_EXPR,
3139 tf_warning_or_error),
3141 tf_warning_or_error);
3144 = cp_build_binary_op (input_location,
3146 cp_build_unary_op (PREDECREMENT_EXPR,
3149 tf_warning_or_error),
3151 tf_warning_or_error);
3153 guard_if_stmt = begin_if_stmt ();
3154 finish_if_stmt_cond (guard_cond, guard_if_stmt);
3158 /* If we're using __cxa_atexit, we have not already set the GUARD,
3159 so we must do so now. */
3160 if (guard && initp && flag_use_cxa_atexit)
3161 finish_expr_stmt (set_guard (guard));
3163 /* Perform the initialization or destruction. */
3167 finish_expr_stmt (init);
3169 /* If we're using __cxa_atexit, register a function that calls the
3170 destructor for the object. */
3171 if (flag_use_cxa_atexit)
3172 finish_expr_stmt (register_dtor_fn (decl));
3175 finish_expr_stmt (build_cleanup (decl));
3177 /* Finish the guard if-stmt, if necessary. */
3180 finish_then_clause (guard_if_stmt);
3181 finish_if_stmt (guard_if_stmt);
3184 /* Now that we're done with DECL we don't need to pretend to be a
3185 member of its class any longer. */
3186 DECL_CONTEXT (current_function_decl) = NULL_TREE;
3187 DECL_STATIC_FUNCTION_P (current_function_decl) = 0;
3190 /* Generate code to do the initialization or destruction of the decls in VARS,
3191 a TREE_LIST of VAR_DECL with static storage duration.
3192 Whether initialization or destruction is performed is specified by INITP. */
3195 do_static_initialization_or_destruction (tree vars, bool initp)
3197 tree node, init_if_stmt, cond;
3199 /* Build the outer if-stmt to check for initialization or destruction. */
3200 init_if_stmt = begin_if_stmt ();
3201 cond = initp ? integer_one_node : integer_zero_node;
3202 cond = cp_build_binary_op (input_location,
3206 tf_warning_or_error);
3207 finish_if_stmt_cond (cond, init_if_stmt);
3211 tree decl = TREE_VALUE (node);
3212 tree priority_if_stmt;
3216 /* If we don't need a destructor, there's nothing to do. Avoid
3217 creating a possibly empty if-stmt. */
3218 if (!initp && TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
3220 node = TREE_CHAIN (node);
3224 /* Remember that we had an initialization or finalization at this
3226 priority = DECL_EFFECTIVE_INIT_PRIORITY (decl);
3227 pi = get_priority_info (priority);
3229 pi->initializations_p = 1;
3231 pi->destructions_p = 1;
3233 /* Conditionalize this initialization on being in the right priority
3234 and being initializing/finalizing appropriately. */
3235 priority_if_stmt = begin_if_stmt ();
3236 cond = cp_build_binary_op (input_location,
3239 build_int_cst (NULL_TREE, priority),
3240 tf_warning_or_error);
3241 finish_if_stmt_cond (cond, priority_if_stmt);
3243 /* Process initializers with same priority. */
3245 && DECL_EFFECTIVE_INIT_PRIORITY (TREE_VALUE (node)) == priority;
3246 node = TREE_CHAIN (node))
3247 /* Do one initialization or destruction. */
3248 one_static_initialization_or_destruction (TREE_VALUE (node),
3249 TREE_PURPOSE (node), initp);
3251 /* Finish up the priority if-stmt body. */
3252 finish_then_clause (priority_if_stmt);
3253 finish_if_stmt (priority_if_stmt);
3257 /* Finish up the init/destruct if-stmt body. */
3258 finish_then_clause (init_if_stmt);
3259 finish_if_stmt (init_if_stmt);
3262 /* VARS is a list of variables with static storage duration which may
3263 need initialization and/or finalization. Remove those variables
3264 that don't really need to be initialized or finalized, and return
3265 the resulting list. The order in which the variables appear in
3266 VARS is in reverse order of the order in which they should actually
3267 be initialized. The list we return is in the unreversed order;
3268 i.e., the first variable should be initialized first. */
3271 prune_vars_needing_no_initialization (tree *vars)
3274 tree result = NULL_TREE;
3279 tree decl = TREE_VALUE (t);
3280 tree init = TREE_PURPOSE (t);
3282 /* Deal gracefully with error. */
3283 if (decl == error_mark_node)
3285 var = &TREE_CHAIN (t);
3289 /* The only things that can be initialized are variables. */
3290 gcc_assert (TREE_CODE (decl) == VAR_DECL);
3292 /* If this object is not defined, we don't need to do anything
3294 if (DECL_EXTERNAL (decl))
3296 var = &TREE_CHAIN (t);
3300 /* Also, if the initializer already contains errors, we can bail
3302 if (init && TREE_CODE (init) == TREE_LIST
3303 && value_member (error_mark_node, init))
3305 var = &TREE_CHAIN (t);
3309 /* This variable is going to need initialization and/or
3310 finalization, so we add it to the list. */
3311 *var = TREE_CHAIN (t);
3312 TREE_CHAIN (t) = result;
3319 /* Make sure we have told the back end about all the variables in
3323 write_out_vars (tree vars)
3327 for (v = vars; v; v = TREE_CHAIN (v))
3329 tree var = TREE_VALUE (v);
3330 if (!var_finalized_p (var))
3332 import_export_decl (var);
3333 rest_of_decl_compilation (var, 1, 1);
3338 /* Generate a static constructor (if CONSTRUCTOR_P) or destructor
3339 (otherwise) that will initialize all global objects with static
3340 storage duration having the indicated PRIORITY. */
3343 generate_ctor_or_dtor_function (bool constructor_p, int priority,
3351 input_location = *locus;
3353 /* Was: locus->line++; */
3355 /* We use `I' to indicate initialization and `D' to indicate
3357 function_key = constructor_p ? 'I' : 'D';
3359 /* We emit the function lazily, to avoid generating empty
3360 global constructors and destructors. */
3363 /* For Objective-C++, we may need to initialize metadata found in this module.
3364 This must be done _before_ any other static initializations. */
3365 if (c_dialect_objc () && (priority == DEFAULT_INIT_PRIORITY)
3366 && constructor_p && objc_static_init_needed_p ())
3368 body = start_objects (function_key, priority);
3369 objc_generate_static_init_call (NULL_TREE);
3372 /* Call the static storage duration function with appropriate
3374 FOR_EACH_VEC_ELT (tree, ssdf_decls, i, fndecl)
3376 /* Calls to pure or const functions will expand to nothing. */
3377 if (! (flags_from_decl_or_type (fndecl) & (ECF_CONST | ECF_PURE)))
3382 body = start_objects (function_key, priority);
3384 call = cp_build_function_call_nary (fndecl, tf_warning_or_error,
3385 build_int_cst (NULL_TREE,
3387 build_int_cst (NULL_TREE,
3390 finish_expr_stmt (call);
3394 /* Close out the function. */
3396 finish_objects (function_key, priority, body);
3399 /* Generate constructor and destructor functions for the priority
3403 generate_ctor_and_dtor_functions_for_priority (splay_tree_node n, void * data)
3405 location_t *locus = (location_t *) data;
3406 int priority = (int) n->key;
3407 priority_info pi = (priority_info) n->value;
3409 /* Generate the functions themselves, but only if they are really
3411 if (pi->initializations_p)
3412 generate_ctor_or_dtor_function (/*constructor_p=*/true, priority, locus);
3413 if (pi->destructions_p)
3414 generate_ctor_or_dtor_function (/*constructor_p=*/false, priority, locus);
3416 /* Keep iterating. */
3420 /* Called via LANGHOOK_CALLGRAPH_ANALYZE_EXPR. It is supposed to mark
3421 decls referenced from front-end specific constructs; it will be called
3422 only for language-specific tree nodes.
3424 Here we must deal with member pointers. */
3427 cxx_callgraph_analyze_expr (tree *tp, int *walk_subtrees ATTRIBUTE_UNUSED)
3431 switch (TREE_CODE (t))
3434 if (TYPE_PTRMEMFUNC_P (TREE_TYPE (t)))
3435 cgraph_mark_address_taken_node (
3436 cgraph_get_create_node (PTRMEM_CST_MEMBER (t)));
3439 if (TREE_CODE (BASELINK_FUNCTIONS (t)) == FUNCTION_DECL)
3440 cgraph_mark_address_taken_node (
3441 cgraph_get_create_node (BASELINK_FUNCTIONS (t)));
3444 if (DECL_CONTEXT (t)
3445 && flag_use_repository
3446 && TREE_CODE (DECL_CONTEXT (t)) == FUNCTION_DECL)
3447 /* If we need a static variable in a function, then we
3448 need the containing function. */
3449 mark_decl_referenced (DECL_CONTEXT (t));
3458 /* Java requires that we be able to reference a local address for a
3459 method, and not be confused by PLT entries. If hidden aliases are
3460 supported, collect and return all the functions for which we should
3461 emit a hidden alias. */
3463 static struct pointer_set_t *
3464 collect_candidates_for_java_method_aliases (void)
3466 struct cgraph_node *node;
3467 struct pointer_set_t *candidates = NULL;
3469 #ifndef HAVE_GAS_HIDDEN
3473 for (node = cgraph_nodes; node ; node = node->next)
3475 tree fndecl = node->decl;
3477 if (DECL_CONTEXT (fndecl)
3478 && TYPE_P (DECL_CONTEXT (fndecl))
3479 && TYPE_FOR_JAVA (DECL_CONTEXT (fndecl))
3480 && TARGET_USE_LOCAL_THUNK_ALIAS_P (fndecl))
3482 if (candidates == NULL)
3483 candidates = pointer_set_create ();
3484 pointer_set_insert (candidates, fndecl);
3492 /* Java requires that we be able to reference a local address for a
3493 method, and not be confused by PLT entries. If hidden aliases are
3494 supported, emit one for each java function that we've emitted.
3495 CANDIDATES is the set of FUNCTION_DECLs that were gathered
3496 by collect_candidates_for_java_method_aliases. */
3499 build_java_method_aliases (struct pointer_set_t *candidates)
3501 struct cgraph_node *node;
3503 #ifndef HAVE_GAS_HIDDEN
3507 for (node = cgraph_nodes; node ; node = node->next)
3509 tree fndecl = node->decl;
3511 if (TREE_ASM_WRITTEN (fndecl)
3512 && pointer_set_contains (candidates, fndecl))
3514 /* Mangle the name in a predictable way; we need to reference
3515 this from a java compiled object file. */
3516 tree oid, nid, alias;
3520 oid = DECL_ASSEMBLER_NAME (fndecl);
3521 oname = IDENTIFIER_POINTER (oid);
3522 gcc_assert (oname[0] == '_' && oname[1] == 'Z');
3523 nname = ACONCAT (("_ZGA", oname+2, NULL));
3524 nid = get_identifier (nname);
3526 alias = make_alias_for (fndecl, nid);
3527 TREE_PUBLIC (alias) = 1;
3528 DECL_VISIBILITY (alias) = VISIBILITY_HIDDEN;
3530 assemble_alias (alias, oid);
3535 /* Return C++ property of T, based on given operation OP. */
3538 cpp_check (tree t, cpp_operation op)
3543 return DECL_PURE_VIRTUAL_P (t);
3544 case IS_CONSTRUCTOR:
3545 return DECL_CONSTRUCTOR_P (t);
3547 return DECL_DESTRUCTOR_P (t);
3548 case IS_COPY_CONSTRUCTOR:
3549 return DECL_COPY_CONSTRUCTOR_P (t);
3551 return TREE_CODE (t) == TEMPLATE_DECL;
3557 /* Collect source file references recursively, starting from NAMESPC. */
3560 collect_source_refs (tree namespc)
3567 /* Iterate over names in this name space. */
3568 for (t = NAMESPACE_LEVEL (namespc)->names; t; t = TREE_CHAIN (t))
3569 if (!DECL_IS_BUILTIN (t) )
3570 collect_source_ref (DECL_SOURCE_FILE (t));
3572 /* Dump siblings, if any */
3573 collect_source_refs (TREE_CHAIN (namespc));
3575 /* Dump children, if any */
3576 collect_source_refs (NAMESPACE_LEVEL (namespc)->namespaces);
3579 /* Collect decls relevant to SOURCE_FILE from all namespaces recursively,
3580 starting from NAMESPC. */
3583 collect_ada_namespace (tree namespc, const char *source_file)
3588 /* Collect decls from this namespace */
3589 collect_ada_nodes (NAMESPACE_LEVEL (namespc)->names, source_file);
3591 /* Collect siblings, if any */
3592 collect_ada_namespace (TREE_CHAIN (namespc), source_file);
3594 /* Collect children, if any */
3595 collect_ada_namespace (NAMESPACE_LEVEL (namespc)->namespaces, source_file);
3598 /* Returns true iff there is a definition available for variable or
3602 decl_defined_p (tree decl)
3604 if (TREE_CODE (decl) == FUNCTION_DECL)
3605 return (DECL_INITIAL (decl) != NULL_TREE);
3608 gcc_assert (TREE_CODE (decl) == VAR_DECL);
3609 return !DECL_EXTERNAL (decl);
3613 /* Nonzero for a VAR_DECL whose value can be used in a constant expression.
3617 An integral constant-expression can only involve ... const
3618 variables of integral or enumeration types initialized with
3619 constant expressions ...
3621 C++0x also allows constexpr variables and temporaries initialized
3622 with constant expressions. We handle the former here, but the latter
3623 are just folded away in cxx_eval_constant_expression.
3625 The standard does not require that the expression be non-volatile.
3626 G++ implements the proposed correction in DR 457. */
3629 decl_constant_var_p (tree decl)
3631 if (!decl_maybe_constant_var_p (decl))
3634 /* We don't know if a template static data member is initialized with
3635 a constant expression until we instantiate its initializer. Even
3636 in the case of a constexpr variable, we can't treat it as a
3637 constant until its initializer is complete in case it's used in
3638 its own initializer. */
3640 return DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl);
3643 /* Returns true if DECL could be a symbolic constant variable, depending on
3647 decl_maybe_constant_var_p (tree decl)
3649 tree type = TREE_TYPE (decl);
3650 if (TREE_CODE (decl) != VAR_DECL)
3652 if (DECL_DECLARED_CONSTEXPR_P (decl))
3654 return (CP_TYPE_CONST_NON_VOLATILE_P (type)
3655 && INTEGRAL_OR_ENUMERATION_TYPE_P (type));
3658 /* Complain that DECL uses a type with no linkage but is never defined. */
3661 no_linkage_error (tree decl)
3663 tree t = no_linkage_check (TREE_TYPE (decl), /*relaxed_p=*/false);
3664 if (TYPE_ANONYMOUS_P (t))
3666 permerror (0, "%q+#D, declared using anonymous type, "
3667 "is used but never defined", decl);
3668 if (is_typedef_decl (TYPE_NAME (t)))
3669 permerror (0, "%q+#D does not refer to the unqualified type, "
3670 "so it is not used for linkage", TYPE_NAME (t));
3673 permerror (0, "%q+#D, declared using local type %qT, "
3674 "is used but never defined", decl, t);
3677 /* Collect declarations from all namespaces relevant to SOURCE_FILE. */
3680 collect_all_refs (const char *source_file)
3682 collect_ada_namespace (global_namespace, source_file);
3685 /* Clear DECL_EXTERNAL for NODE. */
3688 clear_decl_external (struct cgraph_node *node, void *data ATTRIBUTE_UNUSED)
3690 DECL_EXTERNAL (node->decl) = 0;
3694 /* This routine is called at the end of compilation.
3695 Its job is to create all the code needed to initialize and
3696 destroy the global aggregates. We do the destruction
3697 first, since that way we only need to reverse the decls once. */
3700 cp_write_global_declarations (void)
3706 unsigned ssdf_count = 0;
3709 struct pointer_set_t *candidates;
3711 locus = input_location;
3714 /* Bad parse errors. Just forget about it. */
3715 if (! global_bindings_p () || current_class_type
3716 || !VEC_empty (tree,decl_namespace_list))
3720 c_common_write_pch ();
3722 cgraph_process_same_body_aliases ();
3724 /* Handle -fdump-ada-spec[-slim] */
3725 if (dump_enabled_p (TDI_ada))
3727 if (get_dump_file_info (TDI_ada)->flags & TDF_SLIM)
3728 collect_source_ref (main_input_filename);
3730 collect_source_refs (global_namespace);
3732 dump_ada_specs (collect_all_refs, cpp_check);
3735 /* FIXME - huh? was input_line -= 1;*/
3737 timevar_start (TV_PHASE_DEFERRED);
3739 /* We now have to write out all the stuff we put off writing out.
3742 o Template specializations that we have not yet instantiated,
3743 but which are needed.
3744 o Initialization and destruction for non-local objects with
3745 static storage duration. (Local objects with static storage
3746 duration are initialized when their scope is first entered,
3747 and are cleaned up via atexit.)
3748 o Virtual function tables.
3750 All of these may cause others to be needed. For example,
3751 instantiating one function may cause another to be needed, and
3752 generating the initializer for an object may cause templates to be
3753 instantiated, etc., etc. */
3755 emit_support_tinfos ();
3764 /* If there are templates that we've put off instantiating, do
3766 instantiate_pending_templates (retries);
3769 /* Write out virtual tables as required. Note that writing out
3770 the virtual table for a template class may cause the
3771 instantiation of members of that class. If we write out
3772 vtables then we remove the class from our list so we don't
3773 have to look at it again. */
3775 while (keyed_classes != NULL_TREE
3776 && maybe_emit_vtables (TREE_VALUE (keyed_classes)))
3779 keyed_classes = TREE_CHAIN (keyed_classes);
3785 tree next = TREE_CHAIN (t);
3789 if (maybe_emit_vtables (TREE_VALUE (next)))
3792 TREE_CHAIN (t) = TREE_CHAIN (next);
3797 next = TREE_CHAIN (t);
3801 /* Write out needed type info variables. We have to be careful
3802 looping through unemitted decls, because emit_tinfo_decl may
3803 cause other variables to be needed. New elements will be
3804 appended, and we remove from the vector those that actually
3806 for (i = VEC_length (tree, unemitted_tinfo_decls);
3807 VEC_iterate (tree, unemitted_tinfo_decls, --i, t);)
3808 if (emit_tinfo_decl (t))
3811 VEC_unordered_remove (tree, unemitted_tinfo_decls, i);
3814 /* The list of objects with static storage duration is built up
3815 in reverse order. We clear STATIC_AGGREGATES so that any new
3816 aggregates added during the initialization of these will be
3817 initialized in the correct order when we next come around the
3819 vars = prune_vars_needing_no_initialization (&static_aggregates);
3823 /* We need to start a new initialization function each time
3824 through the loop. That's because we need to know which
3825 vtables have been referenced, and TREE_SYMBOL_REFERENCED
3826 isn't computed until a function is finished, and written
3827 out. That's a deficiency in the back end. When this is
3828 fixed, these initialization functions could all become
3829 inline, with resulting performance improvements. */
3832 /* Set the line and file, so that it is obviously not from
3834 input_location = locus;
3835 ssdf_body = start_static_storage_duration_function (ssdf_count);
3837 /* Make sure the back end knows about all the variables. */
3838 write_out_vars (vars);
3840 /* First generate code to do all the initializations. */
3842 do_static_initialization_or_destruction (vars, /*initp=*/true);
3844 /* Then, generate code to do all the destructions. Do these
3845 in reverse order so that the most recently constructed
3846 variable is the first destroyed. If we're using
3847 __cxa_atexit, then we don't need to do this; functions
3848 were registered at initialization time to destroy the
3850 if (!flag_use_cxa_atexit && vars)
3852 vars = nreverse (vars);
3853 do_static_initialization_or_destruction (vars, /*initp=*/false);
3858 /* Finish up the static storage duration function for this
3860 input_location = locus;
3861 finish_static_storage_duration_function (ssdf_body);
3863 /* All those initializations and finalizations might cause
3864 us to need more inline functions, more template
3865 instantiations, etc. */
3868 /* ??? was: locus.line++; */
3871 /* Go through the set of inline functions whose bodies have not
3872 been emitted yet. If out-of-line copies of these functions
3873 are required, emit them. */
3874 FOR_EACH_VEC_ELT (tree, deferred_fns, i, decl)
3876 /* Does it need synthesizing? */
3877 if (DECL_DEFAULTED_FN (decl) && ! DECL_INITIAL (decl)
3878 && (! DECL_REALLY_EXTERN (decl) || possibly_inlined_p (decl)))
3880 /* Even though we're already at the top-level, we push
3881 there again. That way, when we pop back a few lines
3882 hence, all of our state is restored. Otherwise,
3883 finish_function doesn't clean things up, and we end
3884 up with CURRENT_FUNCTION_DECL set. */
3885 push_to_top_level ();
3886 /* The decl's location will mark where it was first
3887 needed. Save that so synthesize method can indicate
3888 where it was needed from, in case of error */
3889 input_location = DECL_SOURCE_LOCATION (decl);
3890 synthesize_method (decl);
3891 pop_from_top_level ();
3895 if (!DECL_SAVED_TREE (decl))
3898 /* We lie to the back end, pretending that some functions
3899 are not defined when they really are. This keeps these
3900 functions from being put out unnecessarily. But, we must
3901 stop lying when the functions are referenced, or if they
3902 are not comdat since they need to be put out now. If
3903 DECL_INTERFACE_KNOWN, then we have already set
3904 DECL_EXTERNAL appropriately, so there's no need to check
3905 again, and we do not want to clear DECL_EXTERNAL if a
3906 previous call to import_export_decl set it.
3908 This is done in a separate for cycle, because if some
3909 deferred function is contained in another deferred
3910 function later in deferred_fns varray,
3911 rest_of_compilation would skip this function and we
3912 really cannot expand the same function twice. */
3913 import_export_decl (decl);
3914 if (DECL_NOT_REALLY_EXTERN (decl)
3915 && DECL_INITIAL (decl)
3916 && decl_needed_p (decl))
3918 struct cgraph_node *node, *next;
3920 node = cgraph_get_node (decl);
3921 if (node->same_body_alias)
3922 node = cgraph_alias_aliased_node (node);
3924 cgraph_for_node_and_aliases (node, clear_decl_external,
3926 /* If we mark !DECL_EXTERNAL one of the symbols in some comdat
3927 group, we need to mark all symbols in the same comdat group
3929 if (node->same_comdat_group)
3930 for (next = node->same_comdat_group;
3932 next = next->same_comdat_group)
3933 cgraph_for_node_and_aliases (next, clear_decl_external,
3937 /* If we're going to need to write this function out, and
3938 there's already a body for it, create RTL for it now.
3939 (There might be no body if this is a method we haven't
3940 gotten around to synthesizing yet.) */
3941 if (!DECL_EXTERNAL (decl)
3942 && decl_needed_p (decl)
3943 && !TREE_ASM_WRITTEN (decl)
3944 && !cgraph_get_node (decl)->local.finalized)
3946 /* We will output the function; no longer consider it in this
3948 DECL_DEFER_OUTPUT (decl) = 0;
3949 /* Generate RTL for this function now that we know we
3951 expand_or_defer_fn (decl);
3952 /* If we're compiling -fsyntax-only pretend that this
3953 function has been written out so that we don't try to
3955 if (flag_syntax_only)
3956 TREE_ASM_WRITTEN (decl) = 1;
3961 if (walk_namespaces (wrapup_globals_for_namespace, /*data=*/0))
3964 /* Static data members are just like namespace-scope globals. */
3965 FOR_EACH_VEC_ELT (tree, pending_statics, i, decl)
3967 if (var_finalized_p (decl) || DECL_REALLY_EXTERN (decl)
3968 /* Don't write it out if we haven't seen a definition. */
3969 || DECL_IN_AGGR_P (decl))
3971 import_export_decl (decl);
3972 /* If this static data member is needed, provide it to the
3974 if (DECL_NOT_REALLY_EXTERN (decl) && decl_needed_p (decl))
3975 DECL_EXTERNAL (decl) = 0;
3977 if (VEC_length (tree, pending_statics) != 0
3978 && wrapup_global_declarations (VEC_address (tree, pending_statics),
3979 VEC_length (tree, pending_statics)))
3986 /* All used inline functions must have a definition at this point. */
3987 FOR_EACH_VEC_ELT (tree, deferred_fns, i, decl)
3989 if (/* Check online inline functions that were actually used. */
3990 DECL_ODR_USED (decl) && DECL_DECLARED_INLINE_P (decl)
3991 /* If the definition actually was available here, then the
3992 fact that the function was not defined merely represents
3993 that for some reason (use of a template repository,
3994 #pragma interface, etc.) we decided not to emit the
3996 && !DECL_INITIAL (decl)
3997 /* Don't complain if the template was defined. */
3998 && !(DECL_TEMPLATE_INSTANTIATION (decl)
3999 && DECL_INITIAL (DECL_TEMPLATE_RESULT
4000 (template_for_substitution (decl)))))
4002 warning (0, "inline function %q+D used but never defined", decl);
4003 /* Avoid a duplicate warning from check_global_declaration_1. */
4004 TREE_NO_WARNING (decl) = 1;
4008 /* So must decls that use a type with no linkage. */
4009 FOR_EACH_VEC_ELT (tree, no_linkage_decls, i, decl)
4010 if (!decl_defined_p (decl))
4011 no_linkage_error (decl);
4013 /* Then, do the Objective-C stuff. This is where all the
4014 Objective-C module stuff gets generated (symtab,
4015 class/protocol/selector lists etc). This must be done after C++
4016 templates, destructors etc. so that selectors used in C++
4017 templates are properly allocated. */
4018 if (c_dialect_objc ())
4019 objc_write_global_declarations ();
4021 /* We give C linkage to static constructors and destructors. */
4022 push_lang_context (lang_name_c);
4024 /* Generate initialization and destruction functions for all
4025 priorities for which they are required. */
4026 if (priority_info_map)
4027 splay_tree_foreach (priority_info_map,
4028 generate_ctor_and_dtor_functions_for_priority,
4030 else if (c_dialect_objc () && objc_static_init_needed_p ())
4031 /* If this is obj-c++ and we need a static init, call
4032 generate_ctor_or_dtor_function. */
4033 generate_ctor_or_dtor_function (/*constructor_p=*/true,
4034 DEFAULT_INIT_PRIORITY, &locus);
4036 /* We're done with the splay-tree now. */
4037 if (priority_info_map)
4038 splay_tree_delete (priority_info_map);
4040 /* Generate any missing aliases. */
4041 maybe_apply_pending_pragma_weaks ();
4043 /* We're done with static constructors, so we can go back to "C++"
4045 pop_lang_context ();
4047 /* Collect candidates for Java hidden aliases. */
4048 candidates = collect_candidates_for_java_method_aliases ();
4050 timevar_stop (TV_PHASE_DEFERRED);
4051 timevar_start (TV_PHASE_CGRAPH);
4053 cgraph_finalize_compilation_unit ();
4055 timevar_stop (TV_PHASE_CGRAPH);
4056 timevar_start (TV_PHASE_CHECK_DBGINFO);
4058 /* Now, issue warnings about static, but not defined, functions,
4059 etc., and emit debugging information. */
4060 walk_namespaces (wrapup_globals_for_namespace, /*data=*/&reconsider);
4061 if (VEC_length (tree, pending_statics) != 0)
4063 check_global_declarations (VEC_address (tree, pending_statics),
4064 VEC_length (tree, pending_statics));
4065 emit_debug_global_declarations (VEC_address (tree, pending_statics),
4066 VEC_length (tree, pending_statics));
4069 perform_deferred_noexcept_checks ();
4071 /* Generate hidden aliases for Java. */
4074 build_java_method_aliases (candidates);
4075 pointer_set_destroy (candidates);
4080 /* The entire file is now complete. If requested, dump everything
4084 FILE *stream = dump_begin (TDI_tu, &flags);
4088 dump_node (global_namespace, flags & ~TDF_SLIM, stream);
4089 dump_end (TDI_tu, stream);
4093 if (flag_detailed_statistics)
4095 dump_tree_statistics ();
4096 dump_time_statistics ();
4098 input_location = locus;
4100 #ifdef ENABLE_CHECKING
4101 validate_conversion_obstack ();
4102 #endif /* ENABLE_CHECKING */
4104 timevar_stop (TV_PHASE_CHECK_DBGINFO);
4107 /* FN is an OFFSET_REF, DOTSTAR_EXPR or MEMBER_REF indicating the
4108 function to call in parse-tree form; it has not yet been
4109 semantically analyzed. ARGS are the arguments to the function.
4110 They have already been semantically analyzed. This may change
4114 build_offset_ref_call_from_tree (tree fn, VEC(tree,gc) **args)
4117 VEC(tree,gc) *orig_args = NULL;
4122 object = TREE_OPERAND (fn, 0);
4124 if (processing_template_decl)
4126 gcc_assert (TREE_CODE (fn) == DOTSTAR_EXPR
4127 || TREE_CODE (fn) == MEMBER_REF);
4128 if (type_dependent_expression_p (fn)
4129 || any_type_dependent_arguments_p (*args))
4130 return build_nt_call_vec (fn, *args);
4132 orig_args = make_tree_vector_copy (*args);
4134 /* Transform the arguments and add the implicit "this"
4135 parameter. That must be done before the FN is transformed
4136 because we depend on the form of FN. */
4137 make_args_non_dependent (*args);
4138 object = build_non_dependent_expr (object);
4139 if (TREE_CODE (TREE_TYPE (fn)) == METHOD_TYPE)
4141 if (TREE_CODE (fn) == DOTSTAR_EXPR)
4142 object = cp_build_addr_expr (object, tf_warning_or_error);
4143 VEC_safe_insert (tree, gc, *args, 0, object);
4145 /* Now that the arguments are done, transform FN. */
4146 fn = build_non_dependent_expr (fn);
4149 /* A qualified name corresponding to a bound pointer-to-member is
4150 represented as an OFFSET_REF:
4152 struct B { void g(); };
4154 void B::g() { (this->*p)(); } */
4155 if (TREE_CODE (fn) == OFFSET_REF)
4157 tree object_addr = cp_build_addr_expr (object, tf_warning_or_error);
4158 fn = TREE_OPERAND (fn, 1);
4159 fn = get_member_function_from_ptrfunc (&object_addr, fn);
4160 VEC_safe_insert (tree, gc, *args, 0, object_addr);
4163 if (CLASS_TYPE_P (TREE_TYPE (fn)))
4164 expr = build_op_call (fn, args, tf_warning_or_error);
4166 expr = cp_build_function_call_vec (fn, args, tf_warning_or_error);
4167 if (processing_template_decl && expr != error_mark_node)
4168 expr = build_min_non_dep_call_vec (expr, orig_fn, orig_args);
4170 if (orig_args != NULL)
4171 release_tree_vector (orig_args);
4178 check_default_args (tree x)
4180 tree arg = TYPE_ARG_TYPES (TREE_TYPE (x));
4181 bool saw_def = false;
4182 int i = 0 - (TREE_CODE (TREE_TYPE (x)) == METHOD_TYPE);
4183 for (; arg && arg != void_list_node; arg = TREE_CHAIN (arg), ++i)
4185 if (TREE_PURPOSE (arg))
4189 error ("default argument missing for parameter %P of %q+#D", i, x);
4190 TREE_PURPOSE (arg) = error_mark_node;
4195 /* Return true if function DECL can be inlined. This is used to force
4196 instantiation of methods that might be interesting for inlining. */
4198 possibly_inlined_p (tree decl)
4200 gcc_assert (TREE_CODE (decl) == FUNCTION_DECL);
4201 if (DECL_UNINLINABLE (decl))
4203 if (!optimize || pragma_java_exceptions)
4204 return DECL_DECLARED_INLINE_P (decl);
4205 /* When optimizing, we might inline everything when flatten
4206 attribute or heuristics inlining for size or autoinlining
4211 /* Mark DECL (either a _DECL or a BASELINK) as "used" in the program.
4212 If DECL is a specialization or implicitly declared class member,
4213 generate the actual definition. Return false if something goes
4214 wrong, true otherwise. */
4217 mark_used (tree decl)
4219 /* If DECL is a BASELINK for a single function, then treat it just
4220 like the DECL for the function. Otherwise, if the BASELINK is
4221 for an overloaded function, we don't know which function was
4222 actually used until after overload resolution. */
4223 if (BASELINK_P (decl))
4225 decl = BASELINK_FUNCTIONS (decl);
4226 if (really_overloaded_fn (decl))
4228 decl = OVL_CURRENT (decl);
4231 /* Set TREE_USED for the benefit of -Wunused. */
4232 TREE_USED (decl) = 1;
4233 if (DECL_CLONED_FUNCTION_P (decl))
4234 TREE_USED (DECL_CLONED_FUNCTION (decl)) = 1;
4236 if (TREE_CODE (decl) == FUNCTION_DECL
4237 && DECL_DELETED_FN (decl))
4239 if (DECL_ARTIFICIAL (decl))
4241 if (DECL_OVERLOADED_OPERATOR_P (decl) == TYPE_EXPR
4242 && LAMBDA_TYPE_P (DECL_CONTEXT (decl)))
4244 /* We mark a lambda conversion op as deleted if we can't
4245 generate it properly; see maybe_add_lambda_conv_op. */
4246 sorry ("converting lambda which uses %<...%> to "
4247 "function pointer");
4251 error ("use of deleted function %qD", decl);
4252 if (!maybe_explain_implicit_delete (decl))
4253 error_at (DECL_SOURCE_LOCATION (decl), "declared here");
4257 /* We can only check DECL_ODR_USED on variables or functions with
4258 DECL_LANG_SPECIFIC set, and these are also the only decls that we
4259 might need special handling for. */
4260 if ((TREE_CODE (decl) != VAR_DECL && TREE_CODE (decl) != FUNCTION_DECL)
4261 || DECL_LANG_SPECIFIC (decl) == NULL
4262 || DECL_THUNK_P (decl))
4265 /* We only want to do this processing once. We don't need to keep trying
4266 to instantiate inline templates, because unit-at-a-time will make sure
4267 we get them compiled before functions that want to inline them. */
4268 if (DECL_ODR_USED (decl))
4271 /* If within finish_function, defer the rest until that function
4272 finishes, otherwise it might recurse. */
4273 if (defer_mark_used_calls)
4275 VEC_safe_push (tree, gc, deferred_mark_used_calls, decl);
4279 if (TREE_CODE (decl) == FUNCTION_DECL)
4280 maybe_instantiate_noexcept (decl);
4282 /* Normally, we can wait until instantiation-time to synthesize DECL.
4283 However, if DECL is a static data member initialized with a constant
4284 or a constexpr function, we need it right now because a reference to
4285 such a data member or a call to such function is not value-dependent. */
4286 if ((decl_maybe_constant_var_p (decl)
4287 || (TREE_CODE (decl) == FUNCTION_DECL
4288 && DECL_DECLARED_CONSTEXPR_P (decl)))
4289 && DECL_LANG_SPECIFIC (decl)
4290 && DECL_TEMPLATE_INFO (decl)
4291 && !uses_template_parms (DECL_TI_ARGS (decl)))
4293 /* Instantiating a function will result in garbage collection. We
4294 must treat this situation as if we were within the body of a
4295 function so as to avoid collecting live data only referenced from
4296 the stack (such as overload resolution candidates). */
4298 instantiate_decl (decl, /*defer_ok=*/false,
4299 /*expl_inst_class_mem_p=*/false);
4303 /* If we don't need a value, then we don't need to synthesize DECL. */
4304 if (cp_unevaluated_operand != 0)
4307 if (processing_template_decl)
4310 /* Check this too in case we're within fold_non_dependent_expr. */
4311 if (DECL_TEMPLATE_INFO (decl)
4312 && uses_template_parms (DECL_TI_ARGS (decl)))
4315 DECL_ODR_USED (decl) = 1;
4316 if (DECL_CLONED_FUNCTION_P (decl))
4317 DECL_ODR_USED (DECL_CLONED_FUNCTION (decl)) = 1;
4319 /* DR 757: A type without linkage shall not be used as the type of a
4320 variable or function with linkage, unless
4321 o the variable or function has extern "C" linkage (7.5 [dcl.link]), or
4322 o the variable or function is not used (3.2 [basic.def.odr]) or is
4323 defined in the same translation unit. */
4324 if (cxx_dialect > cxx98
4325 && decl_linkage (decl) != lk_none
4326 && !DECL_EXTERN_C_P (decl)
4327 && !DECL_ARTIFICIAL (decl)
4328 && !decl_defined_p (decl)
4329 && no_linkage_check (TREE_TYPE (decl), /*relaxed_p=*/false))
4331 if (is_local_extern (decl))
4332 /* There's no way to define a local extern, and adding it to
4333 the vector interferes with GC, so give an error now. */
4334 no_linkage_error (decl);
4336 VEC_safe_push (tree, gc, no_linkage_decls, decl);
4339 if (TREE_CODE (decl) == FUNCTION_DECL && DECL_DECLARED_INLINE_P (decl)
4340 && !DECL_INITIAL (decl) && !DECL_ARTIFICIAL (decl))
4341 /* Remember it, so we can check it was defined. */
4342 note_vague_linkage_fn (decl);
4344 /* Is it a synthesized method that needs to be synthesized? */
4345 if (TREE_CODE (decl) == FUNCTION_DECL
4346 && DECL_NONSTATIC_MEMBER_FUNCTION_P (decl)
4347 && DECL_DEFAULTED_FN (decl)
4348 /* A function defaulted outside the class is synthesized either by
4349 cp_finish_decl or instantiate_decl. */
4350 && !DECL_DEFAULTED_OUTSIDE_CLASS_P (decl)
4351 && ! DECL_INITIAL (decl))
4353 /* Defer virtual destructors so that thunks get the right
4355 if (DECL_VIRTUAL_P (decl) && !at_eof)
4357 note_vague_linkage_fn (decl);
4361 /* Remember the current location for a function we will end up
4362 synthesizing. Then we can inform the user where it was
4363 required in the case of error. */
4364 DECL_SOURCE_LOCATION (decl) = input_location;
4366 /* Synthesizing an implicitly defined member function will result in
4367 garbage collection. We must treat this situation as if we were
4368 within the body of a function so as to avoid collecting live data
4369 on the stack (such as overload resolution candidates).
4371 We could just let cp_write_global_declarations handle synthesizing
4372 this function by adding it to deferred_fns, but doing
4373 it at the use site produces better error messages. */
4375 synthesize_method (decl);
4377 /* If this is a synthesized method we don't need to
4378 do the instantiation test below. */
4380 else if ((TREE_CODE (decl) == FUNCTION_DECL || TREE_CODE (decl) == VAR_DECL)
4381 && DECL_TEMPLATE_INFO (decl)
4382 && (!DECL_EXPLICIT_INSTANTIATION (decl)
4383 || always_instantiate_p (decl)))
4384 /* If this is a function or variable that is an instance of some
4385 template, we now know that we will need to actually do the
4386 instantiation. We check that DECL is not an explicit
4387 instantiation because that is not checked in instantiate_decl.
4389 We put off instantiating functions in order to improve compile
4390 times. Maintaining a stack of active functions is expensive,
4391 and the inliner knows to instantiate any functions it might
4392 need. Therefore, we always try to defer instantiation. */
4395 instantiate_decl (decl, /*defer_ok=*/true,
4396 /*expl_inst_class_mem_p=*/false);
4403 #include "gt-cp-decl2.h"