1 /* Process declarations and variables for C++ compiler.
2 Copyright (C) 1988, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
3 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2007, 2008, 2009
4 Free Software Foundation, Inc.
5 Hacked by Michael Tiemann (tiemann@cygnus.com)
7 This file is part of GCC.
9 GCC is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 3, or (at your option)
14 GCC is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
19 You should have received a copy of the GNU General Public License
20 along with GCC; see the file COPYING3. If not see
21 <http://www.gnu.org/licenses/>. */
24 /* Process declarations and symbol lookup for C++ front end.
25 Also constructs types; the standard scalar types at initialization,
26 and structure, union, array and enum types when they are declared. */
28 /* ??? not all decl nodes are given the most useful possible
29 line numbers. For example, the CONST_DECLs for enum values. */
33 #include "coretypes.h"
48 #include "tree-mudflap.h"
50 #include "tree-inline.h"
52 #include "tree-dump.h"
55 #include "pointer-set.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 decl_defined_p (tree);
90 /* A list of static class variables. This is needed, because a
91 static class variable can be declared inside the class without
92 an initializer, and then initialized, statically, outside the class. */
93 static GTY(()) VEC(tree,gc) *pending_statics;
95 /* A list of functions which were declared inline, but which we
96 may need to emit outline anyway. */
97 static GTY(()) VEC(tree,gc) *deferred_fns;
99 /* A list of decls that use types with no linkage, which we need to make
101 static GTY(()) VEC(tree,gc) *no_linkage_decls;
103 /* Nonzero if we're done parsing and into end-of-file activities. */
109 /* Return a member function type (a METHOD_TYPE), given FNTYPE (a
110 FUNCTION_TYPE), CTYPE (class type), and QUALS (the cv-qualifiers
111 that apply to the function). */
114 build_memfn_type (tree fntype, tree ctype, cp_cv_quals quals)
119 if (fntype == error_mark_node || ctype == error_mark_node)
120 return error_mark_node;
122 type_quals = quals & ~TYPE_QUAL_RESTRICT;
123 ctype = cp_build_qualified_type (ctype, type_quals);
124 fntype = build_method_type_directly (ctype, TREE_TYPE (fntype),
125 (TREE_CODE (fntype) == METHOD_TYPE
126 ? TREE_CHAIN (TYPE_ARG_TYPES (fntype))
127 : TYPE_ARG_TYPES (fntype)));
128 raises = TYPE_RAISES_EXCEPTIONS (fntype);
130 fntype = build_exception_variant (fntype, raises);
135 /* Build a PARM_DECL with NAME and TYPE, and set DECL_ARG_TYPE
139 cp_build_parm_decl (tree name, tree type)
141 tree parm = build_decl (input_location,
142 PARM_DECL, name, type);
143 /* DECL_ARG_TYPE is only used by the back end and the back end never
145 if (!processing_template_decl)
146 DECL_ARG_TYPE (parm) = type_passed_as (type);
148 /* If the type is a pack expansion, then we have a function
150 if (type && TREE_CODE (type) == TYPE_PACK_EXPANSION)
151 FUNCTION_PARAMETER_PACK_P (parm) = 1;
156 /* Returns a PARM_DECL for a parameter of the indicated TYPE, with the
160 build_artificial_parm (tree name, tree type)
162 tree parm = cp_build_parm_decl (name, type);
163 DECL_ARTIFICIAL (parm) = 1;
164 /* All our artificial parms are implicitly `const'; they cannot be
166 TREE_READONLY (parm) = 1;
170 /* Constructors for types with virtual baseclasses need an "in-charge" flag
171 saying whether this constructor is responsible for initialization of
172 virtual baseclasses or not. All destructors also need this "in-charge"
173 flag, which additionally determines whether or not the destructor should
174 free the memory for the object.
176 This function adds the "in-charge" flag to member function FN if
177 appropriate. It is called from grokclassfn and tsubst.
178 FN must be either a constructor or destructor.
180 The in-charge flag follows the 'this' parameter, and is followed by the
181 VTT parm (if any), then the user-written parms. */
184 maybe_retrofit_in_chrg (tree fn)
186 tree basetype, arg_types, parms, parm, fntype;
188 /* If we've already add the in-charge parameter don't do it again. */
189 if (DECL_HAS_IN_CHARGE_PARM_P (fn))
192 /* When processing templates we can't know, in general, whether or
193 not we're going to have virtual baseclasses. */
194 if (processing_template_decl)
197 /* We don't need an in-charge parameter for constructors that don't
198 have virtual bases. */
199 if (DECL_CONSTRUCTOR_P (fn)
200 && !CLASSTYPE_VBASECLASSES (DECL_CONTEXT (fn)))
203 arg_types = TYPE_ARG_TYPES (TREE_TYPE (fn));
204 basetype = TREE_TYPE (TREE_VALUE (arg_types));
205 arg_types = TREE_CHAIN (arg_types);
207 parms = TREE_CHAIN (DECL_ARGUMENTS (fn));
209 /* If this is a subobject constructor or destructor, our caller will
210 pass us a pointer to our VTT. */
211 if (CLASSTYPE_VBASECLASSES (DECL_CONTEXT (fn)))
213 parm = build_artificial_parm (vtt_parm_identifier, vtt_parm_type);
215 /* First add it to DECL_ARGUMENTS between 'this' and the real args... */
216 TREE_CHAIN (parm) = parms;
219 /* ...and then to TYPE_ARG_TYPES. */
220 arg_types = hash_tree_chain (vtt_parm_type, arg_types);
222 DECL_HAS_VTT_PARM_P (fn) = 1;
225 /* Then add the in-charge parm (before the VTT parm). */
226 parm = build_artificial_parm (in_charge_identifier, integer_type_node);
227 TREE_CHAIN (parm) = parms;
229 arg_types = hash_tree_chain (integer_type_node, arg_types);
231 /* Insert our new parameter(s) into the list. */
232 TREE_CHAIN (DECL_ARGUMENTS (fn)) = parms;
234 /* And rebuild the function type. */
235 fntype = build_method_type_directly (basetype, TREE_TYPE (TREE_TYPE (fn)),
237 if (TYPE_RAISES_EXCEPTIONS (TREE_TYPE (fn)))
238 fntype = build_exception_variant (fntype,
239 TYPE_RAISES_EXCEPTIONS (TREE_TYPE (fn)));
240 TREE_TYPE (fn) = fntype;
242 /* Now we've got the in-charge parameter. */
243 DECL_HAS_IN_CHARGE_PARM_P (fn) = 1;
246 /* Classes overload their constituent function names automatically.
247 When a function name is declared in a record structure,
248 its name is changed to it overloaded name. Since names for
249 constructors and destructors can conflict, we place a leading
252 CNAME is the name of the class we are grokking for.
254 FUNCTION is a FUNCTION_DECL. It was created by `grokdeclarator'.
256 FLAGS contains bits saying what's special about today's
257 arguments. DTOR_FLAG == DESTRUCTOR.
259 If FUNCTION is a destructor, then we must add the `auto-delete' field
260 as a second parameter. There is some hair associated with the fact
261 that we must "declare" this variable in the manner consistent with the
262 way the rest of the arguments were declared.
264 QUALS are the qualifiers for the this pointer. */
267 grokclassfn (tree ctype, tree function, enum overload_flags flags)
269 tree fn_name = DECL_NAME (function);
271 /* Even within an `extern "C"' block, members get C++ linkage. See
272 [dcl.link] for details. */
273 SET_DECL_LANGUAGE (function, lang_cplusplus);
275 if (fn_name == NULL_TREE)
277 error ("name missing for member function");
278 fn_name = get_identifier ("<anonymous>");
279 DECL_NAME (function) = fn_name;
282 DECL_CONTEXT (function) = ctype;
284 if (flags == DTOR_FLAG)
285 DECL_DESTRUCTOR_P (function) = 1;
287 if (flags == DTOR_FLAG || DECL_CONSTRUCTOR_P (function))
288 maybe_retrofit_in_chrg (function);
291 /* Create an ARRAY_REF, checking for the user doing things backwards
295 grok_array_decl (tree array_expr, tree index_exp)
299 tree orig_array_expr = array_expr;
300 tree orig_index_exp = index_exp;
302 if (error_operand_p (array_expr) || error_operand_p (index_exp))
303 return error_mark_node;
305 if (processing_template_decl)
307 if (type_dependent_expression_p (array_expr)
308 || type_dependent_expression_p (index_exp))
309 return build_min_nt (ARRAY_REF, array_expr, index_exp,
310 NULL_TREE, NULL_TREE);
311 array_expr = build_non_dependent_expr (array_expr);
312 index_exp = build_non_dependent_expr (index_exp);
315 type = TREE_TYPE (array_expr);
317 type = non_reference (type);
319 /* If they have an `operator[]', use that. */
320 if (MAYBE_CLASS_TYPE_P (type) || MAYBE_CLASS_TYPE_P (TREE_TYPE (index_exp)))
321 expr = build_new_op (ARRAY_REF, LOOKUP_NORMAL,
322 array_expr, index_exp, NULL_TREE,
323 /*overloaded_p=*/NULL, tf_warning_or_error);
328 /* Otherwise, create an ARRAY_REF for a pointer or array type.
329 It is a little-known fact that, if `a' is an array and `i' is
330 an int, you can write `i[a]', which means the same thing as
332 if (TREE_CODE (type) == ARRAY_TYPE)
335 p1 = build_expr_type_conversion (WANT_POINTER, array_expr, false);
337 if (TREE_CODE (TREE_TYPE (index_exp)) == ARRAY_TYPE)
340 p2 = build_expr_type_conversion (WANT_POINTER, index_exp, false);
342 i1 = build_expr_type_conversion (WANT_INT | WANT_ENUM, array_expr,
344 i2 = build_expr_type_conversion (WANT_INT | WANT_ENUM, index_exp,
347 if ((p1 && i2) && (i1 && p2))
348 error ("ambiguous conversion for array subscript");
351 array_expr = p1, index_exp = i2;
353 array_expr = p2, index_exp = i1;
356 error ("invalid types %<%T[%T]%> for array subscript",
357 type, TREE_TYPE (index_exp));
358 return error_mark_node;
361 if (array_expr == error_mark_node || index_exp == error_mark_node)
362 error ("ambiguous conversion for array subscript");
364 expr = build_array_ref (input_location, array_expr, index_exp);
366 if (processing_template_decl && expr != error_mark_node)
367 return build_min_non_dep (ARRAY_REF, expr, orig_array_expr, orig_index_exp,
368 NULL_TREE, NULL_TREE);
372 /* Given the cast expression EXP, checking out its validity. Either return
373 an error_mark_node if there was an unavoidable error, return a cast to
374 void for trying to delete a pointer w/ the value 0, or return the
375 call to delete. If DOING_VEC is true, we handle things differently
376 for doing an array delete.
377 Implements ARM $5.3.4. This is called from the parser. */
380 delete_sanity (tree exp, tree size, bool doing_vec, int use_global_delete)
384 if (exp == error_mark_node)
387 if (processing_template_decl)
389 t = build_min (DELETE_EXPR, void_type_node, exp, size);
390 DELETE_EXPR_USE_GLOBAL (t) = use_global_delete;
391 DELETE_EXPR_USE_VEC (t) = doing_vec;
392 TREE_SIDE_EFFECTS (t) = 1;
396 /* An array can't have been allocated by new, so complain. */
397 if (TREE_CODE (exp) == VAR_DECL
398 && TREE_CODE (TREE_TYPE (exp)) == ARRAY_TYPE)
399 warning (0, "deleting array %q#D", exp);
401 t = build_expr_type_conversion (WANT_POINTER, exp, true);
403 if (t == NULL_TREE || t == error_mark_node)
405 error ("type %q#T argument given to %<delete%>, expected pointer",
407 return error_mark_node;
410 type = TREE_TYPE (t);
412 /* As of Valley Forge, you can delete a pointer to const. */
414 /* You can't delete functions. */
415 if (TREE_CODE (TREE_TYPE (type)) == FUNCTION_TYPE)
417 error ("cannot delete a function. Only pointer-to-objects are "
418 "valid arguments to %<delete%>");
419 return error_mark_node;
422 /* Deleting ptr to void is undefined behavior [expr.delete/3]. */
423 if (TREE_CODE (TREE_TYPE (type)) == VOID_TYPE)
425 warning (0, "deleting %qT is undefined", type);
429 /* Deleting a pointer with the value zero is valid and has no effect. */
430 if (integer_zerop (t))
431 return build1 (NOP_EXPR, void_type_node, t);
434 return build_vec_delete (t, /*maxindex=*/NULL_TREE,
435 sfk_deleting_destructor,
438 return build_delete (type, t, sfk_deleting_destructor,
439 LOOKUP_NORMAL, use_global_delete);
442 /* Report an error if the indicated template declaration is not the
443 sort of thing that should be a member template. */
446 check_member_template (tree tmpl)
450 gcc_assert (TREE_CODE (tmpl) == TEMPLATE_DECL);
451 decl = DECL_TEMPLATE_RESULT (tmpl);
453 if (TREE_CODE (decl) == FUNCTION_DECL
454 || (TREE_CODE (decl) == TYPE_DECL
455 && MAYBE_CLASS_TYPE_P (TREE_TYPE (decl))))
457 /* The parser rejects template declarations in local classes. */
458 gcc_assert (!current_function_decl);
459 /* The parser rejects any use of virtual in a function template. */
460 gcc_assert (!(TREE_CODE (decl) == FUNCTION_DECL
461 && DECL_VIRTUAL_P (decl)));
463 /* The debug-information generating code doesn't know what to do
464 with member templates. */
465 DECL_IGNORED_P (tmpl) = 1;
468 error ("template declaration of %q#D", decl);
471 /* Return true iff TYPE is a valid Java parameter or return type. */
474 acceptable_java_type (tree type)
476 if (type == error_mark_node)
479 if (TREE_CODE (type) == VOID_TYPE || TYPE_FOR_JAVA (type))
481 if (TREE_CODE (type) == POINTER_TYPE || TREE_CODE (type) == REFERENCE_TYPE)
483 type = TREE_TYPE (type);
484 if (TREE_CODE (type) == RECORD_TYPE)
487 if (! TYPE_FOR_JAVA (type))
489 if (! CLASSTYPE_TEMPLATE_INFO (type))
491 args = CLASSTYPE_TI_ARGS (type);
492 i = TREE_VEC_LENGTH (args);
495 type = TREE_VEC_ELT (args, i);
496 if (TREE_CODE (type) == POINTER_TYPE)
497 type = TREE_TYPE (type);
498 if (! TYPE_FOR_JAVA (type))
507 /* For a METHOD in a Java class CTYPE, return true if
508 the parameter and return types are valid Java types.
509 Otherwise, print appropriate error messages, and return false. */
512 check_java_method (tree method)
515 tree arg_types = TYPE_ARG_TYPES (TREE_TYPE (method));
516 tree ret_type = TREE_TYPE (TREE_TYPE (method));
518 if (!acceptable_java_type (ret_type))
520 error ("Java method %qD has non-Java return type %qT",
525 arg_types = TREE_CHAIN (arg_types);
526 if (DECL_HAS_IN_CHARGE_PARM_P (method))
527 arg_types = TREE_CHAIN (arg_types);
528 if (DECL_HAS_VTT_PARM_P (method))
529 arg_types = TREE_CHAIN (arg_types);
531 for (; arg_types != NULL_TREE; arg_types = TREE_CHAIN (arg_types))
533 tree type = TREE_VALUE (arg_types);
534 if (!acceptable_java_type (type))
536 if (type != error_mark_node)
537 error ("Java method %qD has non-Java parameter type %qT",
545 /* Sanity check: report error if this function FUNCTION is not
546 really a member of the class (CTYPE) it is supposed to belong to.
547 TEMPLATE_PARMS is used to specify the template parameters of a member
548 template passed as FUNCTION_DECL. If the member template is passed as a
549 TEMPLATE_DECL, it can be NULL since the parameters can be extracted
550 from the declaration. If the function is not a function template, it
552 It returns the original declaration for the function, NULL_TREE if
553 no declaration was found, error_mark_node if an error was emitted. */
556 check_classfn (tree ctype, tree function, tree template_parms)
562 if (DECL_USE_TEMPLATE (function)
563 && !(TREE_CODE (function) == TEMPLATE_DECL
564 && DECL_TEMPLATE_SPECIALIZATION (function))
565 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (function)))
566 /* Since this is a specialization of a member template,
567 we're not going to find the declaration in the class.
570 struct S { template <typename T> void f(T); };
571 template <> void S::f(int);
573 we're not going to find `S::f(int)', but there's no
574 reason we should, either. We let our callers know we didn't
575 find the method, but we don't complain. */
578 /* Basic sanity check: for a template function, the template parameters
579 either were not passed, or they are the same of DECL_TEMPLATE_PARMS. */
580 if (TREE_CODE (function) == TEMPLATE_DECL)
583 && !comp_template_parms (template_parms,
584 DECL_TEMPLATE_PARMS (function)))
586 error ("template parameter lists provided don't match the "
587 "template parameters of %qD", function);
588 return error_mark_node;
590 template_parms = DECL_TEMPLATE_PARMS (function);
593 /* OK, is this a definition of a member template? */
594 is_template = (template_parms != NULL_TREE);
596 /* We must enter the scope here, because conversion operators are
597 named by target type, and type equivalence relies on typenames
598 resolving within the scope of CTYPE. */
599 pushed_scope = push_scope (ctype);
600 ix = class_method_index_for_fn (complete_type (ctype), function);
603 VEC(tree,gc) *methods = CLASSTYPE_METHOD_VEC (ctype);
604 tree fndecls, fndecl = 0;
606 const char *format = NULL;
608 for (fndecls = VEC_index (tree, methods, ix);
609 fndecls; fndecls = OVL_NEXT (fndecls))
613 fndecl = OVL_CURRENT (fndecls);
614 p1 = TYPE_ARG_TYPES (TREE_TYPE (function));
615 p2 = TYPE_ARG_TYPES (TREE_TYPE (fndecl));
617 /* We cannot simply call decls_match because this doesn't
618 work for static member functions that are pretending to
619 be methods, and because the name may have been changed by
622 /* Get rid of the this parameter on functions that become
624 if (DECL_STATIC_FUNCTION_P (fndecl)
625 && TREE_CODE (TREE_TYPE (function)) == METHOD_TYPE)
626 p1 = TREE_CHAIN (p1);
628 /* A member template definition only matches a member template
630 if (is_template != (TREE_CODE (fndecl) == TEMPLATE_DECL))
633 if (same_type_p (TREE_TYPE (TREE_TYPE (function)),
634 TREE_TYPE (TREE_TYPE (fndecl)))
635 && compparms (p1, p2)
637 || comp_template_parms (template_parms,
638 DECL_TEMPLATE_PARMS (fndecl)))
639 && (DECL_TEMPLATE_SPECIALIZATION (function)
640 == DECL_TEMPLATE_SPECIALIZATION (fndecl))
641 && (!DECL_TEMPLATE_SPECIALIZATION (function)
642 || (DECL_TI_TEMPLATE (function)
643 == DECL_TI_TEMPLATE (fndecl))))
649 pop_scope (pushed_scope);
650 return OVL_CURRENT (fndecls);
653 error_at (DECL_SOURCE_LOCATION (function),
654 "prototype for %q#D does not match any in class %qT",
656 is_conv_op = DECL_CONV_FN_P (fndecl);
659 ix = CLASSTYPE_FIRST_CONVERSION_SLOT;
660 fndecls = VEC_index (tree, methods, ix);
663 fndecl = OVL_CURRENT (fndecls);
664 fndecls = OVL_NEXT (fndecls);
666 if (!fndecls && is_conv_op)
668 if (VEC_length (tree, methods) > (size_t) ++ix)
670 fndecls = VEC_index (tree, methods, ix);
671 if (!DECL_CONV_FN_P (OVL_CURRENT (fndecls)))
683 format = N_("candidates are: %+#D");
685 format = N_("candidate is: %+#D");
686 error (format, fndecl);
689 else if (!COMPLETE_TYPE_P (ctype))
690 cxx_incomplete_type_error (function, ctype);
692 error ("no %q#D member function declared in class %qT",
696 pop_scope (pushed_scope);
697 return error_mark_node;
700 /* DECL is a function with vague linkage. Remember it so that at the
701 end of the translation unit we can decide whether or not to emit
705 note_vague_linkage_fn (tree decl)
707 DECL_DEFER_OUTPUT (decl) = 1;
708 VEC_safe_push (tree, gc, deferred_fns, decl);
711 /* We have just processed the DECL, which is a static data member.
712 The other parameters are as for cp_finish_decl. */
715 finish_static_data_member_decl (tree decl,
716 tree init, bool init_const_expr_p,
720 DECL_CONTEXT (decl) = current_class_type;
722 /* We cannot call pushdecl here, because that would fill in the
723 TREE_CHAIN of our decl. Instead, we modify cp_finish_decl to do
724 the right thing, namely, to put this decl out straight away. */
726 if (! processing_template_decl)
727 VEC_safe_push (tree, gc, pending_statics, decl);
729 if (LOCAL_CLASS_P (current_class_type))
730 permerror (input_location, "local class %q#T shall not have static data member %q#D",
731 current_class_type, decl);
733 /* Static consts need not be initialized in the class definition. */
734 if (init != NULL_TREE && TYPE_NEEDS_CONSTRUCTING (TREE_TYPE (decl)))
736 static int explained = 0;
738 error ("initializer invalid for static member with constructor");
741 error ("(an out of class initialization is required)");
747 DECL_INITIAL (decl) = init;
748 DECL_IN_AGGR_P (decl) = 1;
750 cp_finish_decl (decl, init, init_const_expr_p, asmspec_tree, flags);
753 /* DECLARATOR and DECLSPECS correspond to a class member. The other
754 parameters are as for cp_finish_decl. Return the DECL for the
755 class member declared. */
758 grokfield (const cp_declarator *declarator,
759 cp_decl_specifier_seq *declspecs,
760 tree init, bool init_const_expr_p,
765 const char *asmspec = 0;
766 int flags = LOOKUP_ONLYCONVERTING;
770 && TREE_CODE (init) == TREE_LIST
771 && TREE_VALUE (init) == error_mark_node
772 && TREE_CHAIN (init) == NULL_TREE)
775 value = grokdeclarator (declarator, declspecs, FIELD, init != 0, &attrlist);
776 if (! value || error_operand_p (value))
777 /* friend or constructor went bad. */
778 return error_mark_node;
780 if (TREE_CODE (value) == TYPE_DECL && init)
782 error ("typedef %qD is initialized (use __typeof__ instead)", value);
786 /* Pass friendly classes back. */
787 if (value == void_type_node)
790 /* Pass friend decls back. */
791 if ((TREE_CODE (value) == FUNCTION_DECL
792 || TREE_CODE (value) == TEMPLATE_DECL)
793 && DECL_CONTEXT (value) != current_class_type)
796 name = DECL_NAME (value);
798 if (name != NULL_TREE)
800 if (TREE_CODE (name) == TEMPLATE_ID_EXPR)
802 error ("explicit template argument list not allowed");
803 return error_mark_node;
806 if (IDENTIFIER_POINTER (name)[0] == '_'
807 && ! strcmp (IDENTIFIER_POINTER (name), "_vptr"))
808 error ("member %qD conflicts with virtual function table field name",
812 /* Stash away type declarations. */
813 if (TREE_CODE (value) == TYPE_DECL)
815 DECL_NONLOCAL (value) = 1;
816 DECL_CONTEXT (value) = current_class_type;
818 if (processing_template_decl)
819 value = push_template_decl (value);
825 /* If this is a typedef that names the class for linkage purposes
826 (7.1.3p8), apply any attributes directly to the type. */
827 if (TAGGED_TYPE_P (TREE_TYPE (value))
828 && value == TYPE_NAME (TYPE_MAIN_VARIANT (TREE_TYPE (value))))
829 attrflags = ATTR_FLAG_TYPE_IN_PLACE;
831 cplus_decl_attributes (&value, attrlist, attrflags);
834 if (declspecs->specs[(int)ds_typedef]
835 && TREE_TYPE (value) != error_mark_node
836 && TYPE_NAME (TYPE_MAIN_VARIANT (TREE_TYPE (value))) != value)
837 set_underlying_type (value);
842 if (DECL_IN_AGGR_P (value))
844 error ("%qD is already defined in %qT", value, DECL_CONTEXT (value));
845 return void_type_node;
848 if (asmspec_tree && asmspec_tree != error_mark_node)
849 asmspec = TREE_STRING_POINTER (asmspec_tree);
853 if (TREE_CODE (value) == FUNCTION_DECL)
855 /* Initializers for functions are rejected early in the parser.
856 If we get here, it must be a pure specifier for a method. */
857 if (init == ridpointers[(int)RID_DELETE])
859 DECL_DELETED_FN (value) = 1;
860 DECL_DECLARED_INLINE_P (value) = 1;
861 DECL_INITIAL (value) = error_mark_node;
863 else if (init == ridpointers[(int)RID_DEFAULT])
865 if (!defaultable_fn_p (value))
866 error ("%qD cannot be defaulted", value);
869 DECL_DEFAULTED_FN (value) = 1;
870 DECL_INITIALIZED_IN_CLASS_P (value) = 1;
871 DECL_DECLARED_INLINE_P (value) = 1;
874 else if (TREE_CODE (TREE_TYPE (value)) == METHOD_TYPE)
876 gcc_assert (error_operand_p (init) || integer_zerop (init));
877 DECL_PURE_VIRTUAL_P (value) = 1;
881 gcc_assert (TREE_CODE (TREE_TYPE (value)) == FUNCTION_TYPE);
882 error ("initializer specified for static member function %qD",
886 else if (pedantic && TREE_CODE (value) != VAR_DECL)
887 /* Already complained in grokdeclarator. */
889 else if (!processing_template_decl)
891 if (TREE_CODE (init) == CONSTRUCTOR)
892 init = digest_init (TREE_TYPE (value), init);
894 init = integral_constant_value (init);
896 if (init != error_mark_node && !TREE_CONSTANT (init))
898 /* We can allow references to things that are effectively
899 static, since references are initialized with the
901 if (TREE_CODE (TREE_TYPE (value)) != REFERENCE_TYPE
902 || (TREE_STATIC (init) == 0
903 && (!DECL_P (init) || DECL_EXTERNAL (init) == 0)))
905 error ("field initializer is not constant");
906 init = error_mark_node;
912 if (processing_template_decl
913 && (TREE_CODE (value) == VAR_DECL || TREE_CODE (value) == FUNCTION_DECL))
915 value = push_template_decl (value);
916 if (error_operand_p (value))
917 return error_mark_node;
921 cplus_decl_attributes (&value, attrlist, 0);
923 switch (TREE_CODE (value))
926 finish_static_data_member_decl (value, init, init_const_expr_p,
927 asmspec_tree, flags);
932 error ("%<asm%> specifiers are not permitted on non-static data members");
933 if (DECL_INITIAL (value) == error_mark_node)
934 init = error_mark_node;
935 cp_finish_decl (value, init, /*init_const_expr_p=*/false,
937 DECL_INITIAL (value) = init;
938 DECL_IN_AGGR_P (value) = 1;
943 set_user_assembler_name (value, asmspec);
945 cp_finish_decl (value,
947 /*init_const_expr_p=*/false,
948 asmspec_tree, flags);
950 /* Pass friends back this way. */
951 if (DECL_FRIEND_P (value))
952 return void_type_node;
954 DECL_IN_AGGR_P (value) = 1;
963 /* Like `grokfield', but for bitfields.
964 WIDTH is non-NULL for bit fields only, and is an INTEGER_CST node. */
967 grokbitfield (const cp_declarator *declarator,
968 cp_decl_specifier_seq *declspecs, tree width,
971 tree value = grokdeclarator (declarator, declspecs, BITFIELD, 0, &attrlist);
973 if (value == error_mark_node)
974 return NULL_TREE; /* friends went bad. */
976 /* Pass friendly classes back. */
977 if (TREE_CODE (value) == VOID_TYPE)
978 return void_type_node;
980 if (!INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (TREE_TYPE (value))
981 && (POINTER_TYPE_P (value)
982 || !dependent_type_p (TREE_TYPE (value))))
984 error ("bit-field %qD with non-integral type", value);
985 return error_mark_node;
988 if (TREE_CODE (value) == TYPE_DECL)
990 error ("cannot declare %qD to be a bit-field type", value);
994 /* Usually, finish_struct_1 catches bitfields with invalid types.
995 But, in the case of bitfields with function type, we confuse
996 ourselves into thinking they are member functions, so we must
998 if (TREE_CODE (value) == FUNCTION_DECL)
1000 error ("cannot declare bit-field %qD with function type",
1005 if (DECL_IN_AGGR_P (value))
1007 error ("%qD is already defined in the class %qT", value,
1008 DECL_CONTEXT (value));
1009 return void_type_node;
1012 if (TREE_STATIC (value))
1014 error ("static member %qD cannot be a bit-field", value);
1017 cp_finish_decl (value, NULL_TREE, false, NULL_TREE, 0);
1019 if (width != error_mark_node)
1021 constant_expression_warning (width);
1022 DECL_INITIAL (value) = width;
1023 SET_DECL_C_BIT_FIELD (value);
1026 DECL_IN_AGGR_P (value) = 1;
1029 cplus_decl_attributes (&value, attrlist, /*flags=*/0);
1035 /* Returns true iff ATTR is an attribute which needs to be applied at
1036 instantiation time rather than template definition time. */
1039 is_late_template_attribute (tree attr, tree decl)
1041 tree name = TREE_PURPOSE (attr);
1042 tree args = TREE_VALUE (attr);
1043 const struct attribute_spec *spec = lookup_attribute_spec (name);
1047 /* Unknown attribute. */
1050 /* Attribute weak handling wants to write out assembly right away. */
1051 if (is_attribute_p ("weak", name))
1054 /* If any of the arguments are dependent expressions, we can't evaluate
1055 the attribute until instantiation time. */
1056 for (arg = args; arg; arg = TREE_CHAIN (arg))
1058 tree t = TREE_VALUE (arg);
1060 /* If the first attribute argument is an identifier, only consider
1061 second and following arguments. Attributes like mode, format,
1062 cleanup and several target specific attributes aren't late
1063 just because they have an IDENTIFIER_NODE as first argument. */
1064 if (arg == args && TREE_CODE (t) == IDENTIFIER_NODE)
1067 if (value_dependent_expression_p (t)
1068 || type_dependent_expression_p (t))
1072 if (TREE_CODE (decl) == TYPE_DECL
1074 || spec->type_required)
1076 tree type = TYPE_P (decl) ? decl : TREE_TYPE (decl);
1078 /* We can't apply any attributes to a completely unknown type until
1079 instantiation time. */
1080 enum tree_code code = TREE_CODE (type);
1081 if (code == TEMPLATE_TYPE_PARM
1082 || code == BOUND_TEMPLATE_TEMPLATE_PARM
1083 || code == TYPENAME_TYPE)
1085 /* Also defer most attributes on dependent types. This is not
1086 necessary in all cases, but is the better default. */
1087 else if (dependent_type_p (type)
1088 /* But attribute visibility specifically works on
1090 && !is_attribute_p ("visibility", name))
1099 /* ATTR_P is a list of attributes. Remove any attributes which need to be
1100 applied at instantiation time and return them. If IS_DEPENDENT is true,
1101 the declaration itself is dependent, so all attributes should be applied
1102 at instantiation time. */
1105 splice_template_attributes (tree *attr_p, tree decl)
1108 tree late_attrs = NULL_TREE;
1109 tree *q = &late_attrs;
1116 if (is_late_template_attribute (*p, decl))
1118 ATTR_IS_DEPENDENT (*p) = 1;
1120 *p = TREE_CHAIN (*p);
1121 q = &TREE_CHAIN (*q);
1125 p = &TREE_CHAIN (*p);
1131 /* Remove any late attributes from the list in ATTR_P and attach them to
1135 save_template_attributes (tree *attr_p, tree *decl_p)
1137 tree late_attrs = splice_template_attributes (attr_p, *decl_p);
1139 tree old_attrs = NULL_TREE;
1144 if (DECL_P (*decl_p))
1145 q = &DECL_ATTRIBUTES (*decl_p);
1147 q = &TYPE_ATTRIBUTES (*decl_p);
1151 /* Place the late attributes at the beginning of the attribute
1153 TREE_CHAIN (tree_last (late_attrs)) = *q;
1156 if (!DECL_P (*decl_p) && *decl_p == TYPE_MAIN_VARIANT (*decl_p))
1158 /* We've added new attributes directly to the main variant, so
1159 now we need to update all of the other variants to include
1160 these new attributes. */
1162 for (variant = TYPE_NEXT_VARIANT (*decl_p); variant;
1163 variant = TYPE_NEXT_VARIANT (variant))
1165 gcc_assert (TYPE_ATTRIBUTES (variant) == old_attrs);
1166 TYPE_ATTRIBUTES (variant) = TYPE_ATTRIBUTES (*decl_p);
1171 /* Like reconstruct_complex_type, but handle also template trees. */
1174 cp_reconstruct_complex_type (tree type, tree bottom)
1178 if (TREE_CODE (type) == POINTER_TYPE)
1180 inner = cp_reconstruct_complex_type (TREE_TYPE (type), bottom);
1181 outer = build_pointer_type_for_mode (inner, TYPE_MODE (type),
1182 TYPE_REF_CAN_ALIAS_ALL (type));
1184 else if (TREE_CODE (type) == REFERENCE_TYPE)
1186 inner = cp_reconstruct_complex_type (TREE_TYPE (type), bottom);
1187 outer = build_reference_type_for_mode (inner, TYPE_MODE (type),
1188 TYPE_REF_CAN_ALIAS_ALL (type));
1190 else if (TREE_CODE (type) == ARRAY_TYPE)
1192 inner = cp_reconstruct_complex_type (TREE_TYPE (type), bottom);
1193 outer = build_cplus_array_type (inner, TYPE_DOMAIN (type));
1194 /* Don't call cp_build_qualified_type on ARRAY_TYPEs, the
1195 element type qualification will be handled by the recursive
1196 cp_reconstruct_complex_type call and cp_build_qualified_type
1197 for ARRAY_TYPEs changes the element type. */
1200 else if (TREE_CODE (type) == FUNCTION_TYPE)
1202 inner = cp_reconstruct_complex_type (TREE_TYPE (type), bottom);
1203 outer = build_function_type (inner, TYPE_ARG_TYPES (type));
1205 else if (TREE_CODE (type) == METHOD_TYPE)
1207 inner = cp_reconstruct_complex_type (TREE_TYPE (type), bottom);
1208 /* The build_method_type_directly() routine prepends 'this' to argument list,
1209 so we must compensate by getting rid of it. */
1211 = build_method_type_directly
1212 (TREE_TYPE (TREE_VALUE (TYPE_ARG_TYPES (type))),
1214 TREE_CHAIN (TYPE_ARG_TYPES (type)));
1216 else if (TREE_CODE (type) == OFFSET_TYPE)
1218 inner = cp_reconstruct_complex_type (TREE_TYPE (type), bottom);
1219 outer = build_offset_type (TYPE_OFFSET_BASETYPE (type), inner);
1224 return cp_build_qualified_type (outer, TYPE_QUALS (type));
1227 /* Like decl_attributes, but handle C++ complexity. */
1230 cplus_decl_attributes (tree *decl, tree attributes, int flags)
1232 if (*decl == NULL_TREE || *decl == void_type_node
1233 || *decl == error_mark_node
1234 || attributes == NULL_TREE)
1237 if (processing_template_decl)
1239 if (check_for_bare_parameter_packs (attributes))
1242 save_template_attributes (&attributes, decl);
1243 if (attributes == NULL_TREE)
1247 if (TREE_CODE (*decl) == TEMPLATE_DECL)
1248 decl = &DECL_TEMPLATE_RESULT (*decl);
1250 decl_attributes (decl, attributes, flags);
1252 if (TREE_CODE (*decl) == TYPE_DECL)
1253 SET_IDENTIFIER_TYPE_VALUE (DECL_NAME (*decl), TREE_TYPE (*decl));
1256 /* Walks through the namespace- or function-scope anonymous union
1257 OBJECT, with the indicated TYPE, building appropriate VAR_DECLs.
1258 Returns one of the fields for use in the mangled name. */
1261 build_anon_union_vars (tree type, tree object)
1263 tree main_decl = NULL_TREE;
1266 /* Rather than write the code to handle the non-union case,
1267 just give an error. */
1268 if (TREE_CODE (type) != UNION_TYPE)
1269 error ("anonymous struct not inside named type");
1271 for (field = TYPE_FIELDS (type);
1273 field = TREE_CHAIN (field))
1278 if (DECL_ARTIFICIAL (field))
1280 if (TREE_CODE (field) != FIELD_DECL)
1282 permerror (input_location, "%q+#D invalid; an anonymous union can only "
1283 "have non-static data members", field);
1287 if (TREE_PRIVATE (field))
1288 permerror (input_location, "private member %q+#D in anonymous union", field);
1289 else if (TREE_PROTECTED (field))
1290 permerror (input_location, "protected member %q+#D in anonymous union", field);
1292 if (processing_template_decl)
1293 ref = build_min_nt (COMPONENT_REF, object,
1294 DECL_NAME (field), NULL_TREE);
1296 ref = build_class_member_access_expr (object, field, NULL_TREE,
1297 false, tf_warning_or_error);
1299 if (DECL_NAME (field))
1303 decl = build_decl (input_location,
1304 VAR_DECL, DECL_NAME (field), TREE_TYPE (field));
1305 DECL_ANON_UNION_VAR_P (decl) = 1;
1307 base = get_base_address (object);
1308 TREE_PUBLIC (decl) = TREE_PUBLIC (base);
1309 TREE_STATIC (decl) = TREE_STATIC (base);
1310 DECL_EXTERNAL (decl) = DECL_EXTERNAL (base);
1312 SET_DECL_VALUE_EXPR (decl, ref);
1313 DECL_HAS_VALUE_EXPR_P (decl) = 1;
1315 decl = pushdecl (decl);
1317 else if (ANON_AGGR_TYPE_P (TREE_TYPE (field)))
1318 decl = build_anon_union_vars (TREE_TYPE (field), ref);
1322 if (main_decl == NULL_TREE)
1329 /* Finish off the processing of a UNION_TYPE structure. If the union is an
1330 anonymous union, then all members must be laid out together. PUBLIC_P
1331 is nonzero if this union is not declared static. */
1334 finish_anon_union (tree anon_union_decl)
1340 if (anon_union_decl == error_mark_node)
1343 type = TREE_TYPE (anon_union_decl);
1344 public_p = TREE_PUBLIC (anon_union_decl);
1346 /* The VAR_DECL's context is the same as the TYPE's context. */
1347 DECL_CONTEXT (anon_union_decl) = DECL_CONTEXT (TYPE_NAME (type));
1349 if (TYPE_FIELDS (type) == NULL_TREE)
1354 error ("namespace-scope anonymous aggregates must be static");
1358 main_decl = build_anon_union_vars (type, anon_union_decl);
1359 if (main_decl == error_mark_node)
1361 if (main_decl == NULL_TREE)
1363 warning (0, "anonymous union with no members");
1367 if (!processing_template_decl)
1369 /* Use main_decl to set the mangled name. */
1370 DECL_NAME (anon_union_decl) = DECL_NAME (main_decl);
1371 maybe_commonize_var (anon_union_decl);
1372 mangle_decl (anon_union_decl);
1373 DECL_NAME (anon_union_decl) = NULL_TREE;
1376 pushdecl (anon_union_decl);
1377 if (building_stmt_tree ()
1378 && at_function_scope_p ())
1379 add_decl_expr (anon_union_decl);
1380 else if (!processing_template_decl)
1381 rest_of_decl_compilation (anon_union_decl,
1382 toplevel_bindings_p (), at_eof);
1385 /* Auxiliary functions to make type signatures for
1386 `operator new' and `operator delete' correspond to
1387 what compiler will be expecting. */
1390 coerce_new_type (tree type)
1393 tree args = TYPE_ARG_TYPES (type);
1395 gcc_assert (TREE_CODE (type) == FUNCTION_TYPE);
1397 if (!same_type_p (TREE_TYPE (type), ptr_type_node))
1400 error ("%<operator new%> must return type %qT", ptr_type_node);
1403 if (args && args != void_list_node)
1405 if (TREE_PURPOSE (args))
1407 /* [basic.stc.dynamic.allocation]
1409 The first parameter shall not have an associated default
1411 error ("the first parameter of %<operator new%> cannot "
1412 "have a default argument");
1413 /* Throw away the default argument. */
1414 TREE_PURPOSE (args) = NULL_TREE;
1417 if (!same_type_p (TREE_VALUE (args), size_type_node))
1420 args = TREE_CHAIN (args);
1427 permerror (input_location, "%<operator new%> takes type %<size_t%> (%qT) "
1428 "as first parameter", size_type_node);
1433 args = tree_cons (NULL_TREE, size_type_node, args);
1436 type = build_exception_variant
1437 (build_function_type (ptr_type_node, args),
1438 TYPE_RAISES_EXCEPTIONS (type));
1446 coerce_delete_type (tree type)
1449 tree args = TYPE_ARG_TYPES (type);
1451 gcc_assert (TREE_CODE (type) == FUNCTION_TYPE);
1453 if (!same_type_p (TREE_TYPE (type), void_type_node))
1456 error ("%<operator delete%> must return type %qT", void_type_node);
1459 if (!args || args == void_list_node
1460 || !same_type_p (TREE_VALUE (args), ptr_type_node))
1463 if (args && args != void_list_node)
1464 args = TREE_CHAIN (args);
1465 error ("%<operator delete%> takes type %qT as first parameter",
1471 args = tree_cons (NULL_TREE, ptr_type_node, args);
1474 type = build_exception_variant
1475 (build_function_type (void_type_node, args),
1476 TYPE_RAISES_EXCEPTIONS (type));
1484 /* DECL is a VAR_DECL for a vtable: walk through the entries in the vtable
1485 and mark them as needed. */
1488 mark_vtable_entries (tree decl)
1491 unsigned HOST_WIDE_INT idx;
1493 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (DECL_INITIAL (decl)),
1498 STRIP_NOPS (fnaddr);
1500 if (TREE_CODE (fnaddr) != ADDR_EXPR
1501 && TREE_CODE (fnaddr) != FDESC_EXPR)
1502 /* This entry is an offset: a virtual base class offset, a
1503 virtual call offset, an RTTI offset, etc. */
1506 fn = TREE_OPERAND (fnaddr, 0);
1507 TREE_ADDRESSABLE (fn) = 1;
1508 /* When we don't have vcall offsets, we output thunks whenever
1509 we output the vtables that contain them. With vcall offsets,
1510 we know all the thunks we'll need when we emit a virtual
1511 function, so we emit the thunks there instead. */
1512 if (DECL_THUNK_P (fn))
1513 use_thunk (fn, /*emit_p=*/0);
1518 /* Set DECL up to have the closest approximation of "initialized common"
1519 linkage available. */
1522 comdat_linkage (tree decl)
1525 make_decl_one_only (decl, cxx_comdat_group (decl));
1526 else if (TREE_CODE (decl) == FUNCTION_DECL
1527 || (TREE_CODE (decl) == VAR_DECL && DECL_ARTIFICIAL (decl)))
1528 /* We can just emit function and compiler-generated variables
1529 statically; having multiple copies is (for the most part) only
1532 There are two correctness issues, however: the address of a
1533 template instantiation with external linkage should be the
1534 same, independent of what translation unit asks for the
1535 address, and this will not hold when we emit multiple copies of
1536 the function. However, there's little else we can do.
1538 Also, by default, the typeinfo implementation assumes that
1539 there will be only one copy of the string used as the name for
1540 each type. Therefore, if weak symbols are unavailable, the
1541 run-time library should perform a more conservative check; it
1542 should perform a string comparison, rather than an address
1544 TREE_PUBLIC (decl) = 0;
1547 /* Static data member template instantiations, however, cannot
1548 have multiple copies. */
1549 if (DECL_INITIAL (decl) == 0
1550 || DECL_INITIAL (decl) == error_mark_node)
1551 DECL_COMMON (decl) = 1;
1552 else if (EMPTY_CONSTRUCTOR_P (DECL_INITIAL (decl)))
1554 DECL_COMMON (decl) = 1;
1555 DECL_INITIAL (decl) = error_mark_node;
1557 else if (!DECL_EXPLICIT_INSTANTIATION (decl))
1559 /* We can't do anything useful; leave vars for explicit
1561 DECL_EXTERNAL (decl) = 1;
1562 DECL_NOT_REALLY_EXTERN (decl) = 0;
1566 if (DECL_LANG_SPECIFIC (decl))
1567 DECL_COMDAT (decl) = 1;
1570 /* For win32 we also want to put explicit instantiations in
1571 linkonce sections, so that they will be merged with implicit
1572 instantiations; otherwise we get duplicate symbol errors.
1573 For Darwin we do not want explicit instantiations to be
1577 maybe_make_one_only (tree decl)
1579 /* We used to say that this was not necessary on targets that support weak
1580 symbols, because the implicit instantiations will defer to the explicit
1581 one. However, that's not actually the case in SVR4; a strong definition
1582 after a weak one is an error. Also, not making explicit
1583 instantiations one_only means that we can end up with two copies of
1584 some template instantiations. */
1588 /* We can't set DECL_COMDAT on functions, or cp_finish_file will think
1589 we can get away with not emitting them if they aren't used. We need
1590 to for variables so that cp_finish_decl will update their linkage,
1591 because their DECL_INITIAL may not have been set properly yet. */
1593 if (!TARGET_WEAK_NOT_IN_ARCHIVE_TOC
1594 || (! DECL_EXPLICIT_INSTANTIATION (decl)
1595 && ! DECL_TEMPLATE_SPECIALIZATION (decl)))
1597 make_decl_one_only (decl, cxx_comdat_group (decl));
1599 if (TREE_CODE (decl) == VAR_DECL)
1601 DECL_COMDAT (decl) = 1;
1602 /* Mark it needed so we don't forget to emit it. */
1603 mark_decl_referenced (decl);
1608 /* Returns true iff DECL, a FUNCTION_DECL, has vague linkage. This
1609 predicate will give the right answer during parsing of the function,
1610 which other tests may not. */
1613 vague_linkage_fn_p (tree fn)
1615 /* Unfortunately, import_export_decl has not always been called
1616 before the function is processed, so we cannot simply check
1618 return (DECL_COMDAT (fn)
1619 || ((DECL_DECLARED_INLINE_P (fn)
1620 || DECL_TEMPLATE_INSTANTIATION (fn))
1621 && TREE_PUBLIC (fn)));
1624 /* Determine whether or not we want to specifically import or export CTYPE,
1625 using various heuristics. */
1628 import_export_class (tree ctype)
1630 /* -1 for imported, 1 for exported. */
1631 int import_export = 0;
1633 /* It only makes sense to call this function at EOF. The reason is
1634 that this function looks at whether or not the first non-inline
1635 non-abstract virtual member function has been defined in this
1636 translation unit. But, we can't possibly know that until we've
1637 seen the entire translation unit. */
1638 gcc_assert (at_eof);
1640 if (CLASSTYPE_INTERFACE_KNOWN (ctype))
1643 /* If MULTIPLE_SYMBOL_SPACES is set and we saw a #pragma interface,
1644 we will have CLASSTYPE_INTERFACE_ONLY set but not
1645 CLASSTYPE_INTERFACE_KNOWN. In that case, we don't want to use this
1646 heuristic because someone will supply a #pragma implementation
1647 elsewhere, and deducing it here would produce a conflict. */
1648 if (CLASSTYPE_INTERFACE_ONLY (ctype))
1651 if (lookup_attribute ("dllimport", TYPE_ATTRIBUTES (ctype)))
1653 else if (lookup_attribute ("dllexport", TYPE_ATTRIBUTES (ctype)))
1655 else if (CLASSTYPE_IMPLICIT_INSTANTIATION (ctype)
1656 && !flag_implicit_templates)
1657 /* For a template class, without -fimplicit-templates, check the
1658 repository. If the virtual table is assigned to this
1659 translation unit, then export the class; otherwise, import
1661 import_export = repo_export_class_p (ctype) ? 1 : -1;
1662 else if (TYPE_POLYMORPHIC_P (ctype))
1664 /* The ABI specifies that the virtual table and associated
1665 information are emitted with the key method, if any. */
1666 tree method = CLASSTYPE_KEY_METHOD (ctype);
1667 /* If weak symbol support is not available, then we must be
1668 careful not to emit the vtable when the key function is
1669 inline. An inline function can be defined in multiple
1670 translation units. If we were to emit the vtable in each
1671 translation unit containing a definition, we would get
1672 multiple definition errors at link-time. */
1673 if (method && (flag_weak || ! DECL_DECLARED_INLINE_P (method)))
1674 import_export = (DECL_REALLY_EXTERN (method) ? -1 : 1);
1677 /* When MULTIPLE_SYMBOL_SPACES is set, we cannot count on seeing
1678 a definition anywhere else. */
1679 if (MULTIPLE_SYMBOL_SPACES && import_export == -1)
1682 /* Allow back ends the chance to overrule the decision. */
1683 if (targetm.cxx.import_export_class)
1684 import_export = targetm.cxx.import_export_class (ctype, import_export);
1688 SET_CLASSTYPE_INTERFACE_KNOWN (ctype);
1689 CLASSTYPE_INTERFACE_ONLY (ctype) = (import_export < 0);
1693 /* Return true if VAR has already been provided to the back end; in that
1694 case VAR should not be modified further by the front end. */
1696 var_finalized_p (tree var)
1698 return varpool_node (var)->finalized;
1701 /* DECL is a VAR_DECL or FUNCTION_DECL which, for whatever reason,
1702 must be emitted in this translation unit. Mark it as such. */
1705 mark_needed (tree decl)
1707 /* It's possible that we no longer need to set
1708 TREE_SYMBOL_REFERENCED here directly, but doing so is
1710 TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)) = 1;
1711 mark_decl_referenced (decl);
1714 /* DECL is either a FUNCTION_DECL or a VAR_DECL. This function
1715 returns true if a definition of this entity should be provided in
1716 this object file. Callers use this function to determine whether
1717 or not to let the back end know that a definition of DECL is
1718 available in this translation unit. */
1721 decl_needed_p (tree decl)
1723 gcc_assert (TREE_CODE (decl) == VAR_DECL
1724 || TREE_CODE (decl) == FUNCTION_DECL);
1725 /* This function should only be called at the end of the translation
1726 unit. We cannot be sure of whether or not something will be
1727 COMDAT until that point. */
1728 gcc_assert (at_eof);
1730 /* All entities with external linkage that are not COMDAT should be
1731 emitted; they may be referred to from other object files. */
1732 if (TREE_PUBLIC (decl) && !DECL_COMDAT (decl))
1734 /* If this entity was used, let the back end see it; it will decide
1735 whether or not to emit it into the object file. */
1736 if (TREE_USED (decl)
1737 || (DECL_ASSEMBLER_NAME_SET_P (decl)
1738 && TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))))
1740 /* Functions marked "dllexport" must be emitted so that they are
1741 visible to other DLLs. */
1742 if (lookup_attribute ("dllexport", DECL_ATTRIBUTES (decl)))
1744 /* Otherwise, DECL does not need to be emitted -- yet. A subsequent
1745 reference to DECL might cause it to be emitted later. */
1749 /* If necessary, write out the vtables for the dynamic class CTYPE.
1750 Returns true if any vtables were emitted. */
1753 maybe_emit_vtables (tree ctype)
1759 /* If the vtables for this class have already been emitted there is
1760 nothing more to do. */
1761 primary_vtbl = CLASSTYPE_VTABLES (ctype);
1762 if (var_finalized_p (primary_vtbl))
1764 /* Ignore dummy vtables made by get_vtable_decl. */
1765 if (TREE_TYPE (primary_vtbl) == void_type_node)
1768 /* On some targets, we cannot determine the key method until the end
1769 of the translation unit -- which is when this function is
1771 if (!targetm.cxx.key_method_may_be_inline ())
1772 determine_key_method (ctype);
1774 /* See if any of the vtables are needed. */
1775 for (vtbl = CLASSTYPE_VTABLES (ctype); vtbl; vtbl = TREE_CHAIN (vtbl))
1777 import_export_decl (vtbl);
1778 if (DECL_NOT_REALLY_EXTERN (vtbl) && decl_needed_p (vtbl))
1783 /* If the references to this class' vtables are optimized away,
1784 still emit the appropriate debugging information. See
1786 if (DECL_COMDAT (primary_vtbl)
1787 && CLASSTYPE_DEBUG_REQUESTED (ctype))
1788 note_debug_info_needed (ctype);
1792 /* The ABI requires that we emit all of the vtables if we emit any
1794 for (vtbl = CLASSTYPE_VTABLES (ctype); vtbl; vtbl = TREE_CHAIN (vtbl))
1796 /* Mark entities references from the virtual table as used. */
1797 mark_vtable_entries (vtbl);
1799 if (TREE_TYPE (DECL_INITIAL (vtbl)) == 0)
1801 tree expr = store_init_value (vtbl, DECL_INITIAL (vtbl), LOOKUP_NORMAL);
1803 /* It had better be all done at compile-time. */
1808 DECL_EXTERNAL (vtbl) = 0;
1809 rest_of_decl_compilation (vtbl, 1, 1);
1811 /* Because we're only doing syntax-checking, we'll never end up
1812 actually marking the variable as written. */
1813 if (flag_syntax_only)
1814 TREE_ASM_WRITTEN (vtbl) = 1;
1817 /* Since we're writing out the vtable here, also write the debug
1819 note_debug_info_needed (ctype);
1824 /* A special return value from type_visibility meaning internal
1827 enum { VISIBILITY_ANON = VISIBILITY_INTERNAL+1 };
1829 /* walk_tree helper function for type_visibility. */
1832 min_vis_r (tree *tp, int *walk_subtrees, void *data)
1834 int *vis_p = (int *)data;
1839 else if (CLASS_TYPE_P (*tp))
1841 if (!TREE_PUBLIC (TYPE_MAIN_DECL (*tp)))
1843 *vis_p = VISIBILITY_ANON;
1846 else if (CLASSTYPE_VISIBILITY (*tp) > *vis_p)
1847 *vis_p = CLASSTYPE_VISIBILITY (*tp);
1852 /* Returns the visibility of TYPE, which is the minimum visibility of its
1856 type_visibility (tree type)
1858 int vis = VISIBILITY_DEFAULT;
1859 cp_walk_tree_without_duplicates (&type, min_vis_r, &vis);
1863 /* Limit the visibility of DECL to VISIBILITY, if not explicitly
1864 specified (or if VISIBILITY is static). */
1867 constrain_visibility (tree decl, int visibility)
1869 if (visibility == VISIBILITY_ANON)
1871 /* extern "C" declarations aren't affected by the anonymous
1873 if (!DECL_EXTERN_C_P (decl))
1875 TREE_PUBLIC (decl) = 0;
1876 DECL_COMDAT_GROUP (decl) = NULL_TREE;
1877 DECL_INTERFACE_KNOWN (decl) = 1;
1878 if (DECL_LANG_SPECIFIC (decl))
1879 DECL_NOT_REALLY_EXTERN (decl) = 1;
1882 else if (visibility > DECL_VISIBILITY (decl)
1883 && !DECL_VISIBILITY_SPECIFIED (decl))
1885 DECL_VISIBILITY (decl) = (enum symbol_visibility) visibility;
1891 /* Constrain the visibility of DECL based on the visibility of its template
1895 constrain_visibility_for_template (tree decl, tree targs)
1897 /* If this is a template instantiation, check the innermost
1898 template args for visibility constraints. The outer template
1899 args are covered by the class check. */
1900 tree args = INNERMOST_TEMPLATE_ARGS (targs);
1902 for (i = TREE_VEC_LENGTH (args); i > 0; --i)
1906 tree arg = TREE_VEC_ELT (args, i-1);
1908 vis = type_visibility (arg);
1909 else if (TREE_TYPE (arg) && POINTER_TYPE_P (TREE_TYPE (arg)))
1912 if (TREE_CODE (arg) == ADDR_EXPR)
1913 arg = TREE_OPERAND (arg, 0);
1914 if (TREE_CODE (arg) == VAR_DECL
1915 || TREE_CODE (arg) == FUNCTION_DECL)
1917 if (! TREE_PUBLIC (arg))
1918 vis = VISIBILITY_ANON;
1920 vis = DECL_VISIBILITY (arg);
1924 constrain_visibility (decl, vis);
1928 /* Like c_determine_visibility, but with additional C++-specific
1931 Function-scope entities can rely on the function's visibility because
1932 it is set in start_preparsed_function.
1934 Class-scope entities cannot rely on the class's visibility until the end
1935 of the enclosing class definition.
1937 Note that because namespaces have multiple independent definitions,
1938 namespace visibility is handled elsewhere using the #pragma visibility
1939 machinery rather than by decorating the namespace declaration.
1941 The goal is for constraints from the type to give a diagnostic, and
1942 other constraints to be applied silently. */
1945 determine_visibility (tree decl)
1947 tree class_type = NULL_TREE;
1949 bool orig_visibility_specified;
1950 enum symbol_visibility orig_visibility;
1952 /* Remember that all decls get VISIBILITY_DEFAULT when built. */
1954 /* Only relevant for names with external linkage. */
1955 if (!TREE_PUBLIC (decl))
1958 /* Cloned constructors and destructors get the same visibility as
1959 the underlying function. That should be set up in
1960 maybe_clone_body. */
1961 gcc_assert (!DECL_CLONED_FUNCTION_P (decl));
1963 orig_visibility_specified = DECL_VISIBILITY_SPECIFIED (decl);
1964 orig_visibility = DECL_VISIBILITY (decl);
1966 if (TREE_CODE (decl) == TYPE_DECL)
1968 if (CLASS_TYPE_P (TREE_TYPE (decl)))
1969 use_template = CLASSTYPE_USE_TEMPLATE (TREE_TYPE (decl));
1970 else if (TYPE_TEMPLATE_INFO (TREE_TYPE (decl)))
1975 else if (DECL_LANG_SPECIFIC (decl))
1976 use_template = DECL_USE_TEMPLATE (decl);
1980 /* If DECL is a member of a class, visibility specifiers on the
1981 class can influence the visibility of the DECL. */
1982 if (DECL_CLASS_SCOPE_P (decl))
1983 class_type = DECL_CONTEXT (decl);
1986 /* Not a class member. */
1988 /* Virtual tables have DECL_CONTEXT set to their associated class,
1989 so they are automatically handled above. */
1990 gcc_assert (TREE_CODE (decl) != VAR_DECL
1991 || !DECL_VTABLE_OR_VTT_P (decl));
1993 if (DECL_FUNCTION_SCOPE_P (decl) && ! DECL_VISIBILITY_SPECIFIED (decl))
1995 /* Local statics and classes get the visibility of their
1996 containing function by default, except that
1997 -fvisibility-inlines-hidden doesn't affect them. */
1998 tree fn = DECL_CONTEXT (decl);
1999 if (DECL_VISIBILITY_SPECIFIED (fn) || ! DECL_CLASS_SCOPE_P (fn))
2001 DECL_VISIBILITY (decl) = DECL_VISIBILITY (fn);
2002 DECL_VISIBILITY_SPECIFIED (decl) =
2003 DECL_VISIBILITY_SPECIFIED (fn);
2006 determine_visibility_from_class (decl, DECL_CONTEXT (fn));
2008 /* Local classes in templates have CLASSTYPE_USE_TEMPLATE set,
2009 but have no TEMPLATE_INFO, so don't try to check it. */
2012 else if (TREE_CODE (decl) == VAR_DECL && DECL_TINFO_P (decl)
2013 && flag_visibility_ms_compat)
2015 /* Under -fvisibility-ms-compat, types are visible by default,
2016 even though their contents aren't. */
2017 tree underlying_type = TREE_TYPE (DECL_NAME (decl));
2018 int underlying_vis = type_visibility (underlying_type);
2019 if (underlying_vis == VISIBILITY_ANON
2020 || CLASSTYPE_VISIBILITY_SPECIFIED (underlying_type))
2021 constrain_visibility (decl, underlying_vis);
2023 DECL_VISIBILITY (decl) = VISIBILITY_DEFAULT;
2025 else if (TREE_CODE (decl) == VAR_DECL && DECL_TINFO_P (decl))
2027 /* tinfo visibility is based on the type it's for. */
2028 constrain_visibility
2029 (decl, type_visibility (TREE_TYPE (DECL_NAME (decl))));
2031 /* Give the target a chance to override the visibility associated
2033 if (TREE_PUBLIC (decl)
2034 && !DECL_REALLY_EXTERN (decl)
2035 && CLASS_TYPE_P (TREE_TYPE (DECL_NAME (decl)))
2036 && !CLASSTYPE_VISIBILITY_SPECIFIED (TREE_TYPE (DECL_NAME (decl))))
2037 targetm.cxx.determine_class_data_visibility (decl);
2039 else if (use_template)
2040 /* Template instantiations and specializations get visibility based
2041 on their template unless they override it with an attribute. */;
2042 else if (! DECL_VISIBILITY_SPECIFIED (decl))
2044 /* Set default visibility to whatever the user supplied with
2045 #pragma GCC visibility or a namespace visibility attribute. */
2046 DECL_VISIBILITY (decl) = default_visibility;
2047 DECL_VISIBILITY_SPECIFIED (decl) = visibility_options.inpragma;
2053 /* If the specialization doesn't specify visibility, use the
2054 visibility from the template. */
2055 tree tinfo = (TREE_CODE (decl) == TYPE_DECL
2056 ? TYPE_TEMPLATE_INFO (TREE_TYPE (decl))
2057 : DECL_TEMPLATE_INFO (decl));
2058 tree args = TI_ARGS (tinfo);
2060 if (args != error_mark_node)
2062 int depth = TMPL_ARGS_DEPTH (args);
2063 tree pattern = DECL_TEMPLATE_RESULT (TI_TEMPLATE (tinfo));
2065 if (!DECL_VISIBILITY_SPECIFIED (decl))
2067 DECL_VISIBILITY (decl) = DECL_VISIBILITY (pattern);
2068 DECL_VISIBILITY_SPECIFIED (decl)
2069 = DECL_VISIBILITY_SPECIFIED (pattern);
2072 /* FIXME should TMPL_ARGS_DEPTH really return 1 for null input? */
2073 if (args && depth > template_class_depth (class_type))
2074 /* Limit visibility based on its template arguments. */
2075 constrain_visibility_for_template (decl, args);
2080 determine_visibility_from_class (decl, class_type);
2082 if (decl_anon_ns_mem_p (decl))
2083 /* Names in an anonymous namespace get internal linkage.
2084 This might change once we implement export. */
2085 constrain_visibility (decl, VISIBILITY_ANON);
2086 else if (TREE_CODE (decl) != TYPE_DECL)
2088 /* Propagate anonymity from type to decl. */
2089 int tvis = type_visibility (TREE_TYPE (decl));
2090 if (tvis == VISIBILITY_ANON
2091 || ! DECL_VISIBILITY_SPECIFIED (decl))
2092 constrain_visibility (decl, tvis);
2094 else if (no_linkage_check (TREE_TYPE (decl), /*relaxed_p=*/true))
2095 /* DR 757: A type without linkage shall not be used as the type of a
2096 variable or function with linkage, unless
2097 o the variable or function has extern "C" linkage (7.5 [dcl.link]), or
2098 o the variable or function is not used (3.2 [basic.def.odr]) or is
2099 defined in the same translation unit.
2101 Since non-extern "C" decls need to be defined in the same
2102 translation unit, we can make the type internal. */
2103 constrain_visibility (decl, VISIBILITY_ANON);
2105 /* If visibility changed and DECL already has DECL_RTL, ensure
2106 symbol flags are updated. */
2107 if ((DECL_VISIBILITY (decl) != orig_visibility
2108 || DECL_VISIBILITY_SPECIFIED (decl) != orig_visibility_specified)
2109 && ((TREE_CODE (decl) == VAR_DECL && TREE_STATIC (decl))
2110 || TREE_CODE (decl) == FUNCTION_DECL)
2111 && DECL_RTL_SET_P (decl))
2112 make_decl_rtl (decl);
2115 /* By default, static data members and function members receive
2116 the visibility of their containing class. */
2119 determine_visibility_from_class (tree decl, tree class_type)
2121 if (DECL_VISIBILITY_SPECIFIED (decl))
2124 if (visibility_options.inlines_hidden
2125 /* Don't do this for inline templates; specializations might not be
2126 inline, and we don't want them to inherit the hidden
2127 visibility. We'll set it here for all inline instantiations. */
2128 && !processing_template_decl
2129 && TREE_CODE (decl) == FUNCTION_DECL
2130 && DECL_DECLARED_INLINE_P (decl)
2131 && (! DECL_LANG_SPECIFIC (decl)
2132 || ! DECL_EXPLICIT_INSTANTIATION (decl)))
2133 DECL_VISIBILITY (decl) = VISIBILITY_HIDDEN;
2136 /* Default to the class visibility. */
2137 DECL_VISIBILITY (decl) = CLASSTYPE_VISIBILITY (class_type);
2138 DECL_VISIBILITY_SPECIFIED (decl)
2139 = CLASSTYPE_VISIBILITY_SPECIFIED (class_type);
2142 /* Give the target a chance to override the visibility associated
2144 if (TREE_CODE (decl) == VAR_DECL
2145 && (DECL_TINFO_P (decl)
2146 || (DECL_VTABLE_OR_VTT_P (decl)
2147 /* Construction virtual tables are not exported because
2148 they cannot be referred to from other object files;
2149 their name is not standardized by the ABI. */
2150 && !DECL_CONSTRUCTION_VTABLE_P (decl)))
2151 && TREE_PUBLIC (decl)
2152 && !DECL_REALLY_EXTERN (decl)
2153 && !CLASSTYPE_VISIBILITY_SPECIFIED (class_type))
2154 targetm.cxx.determine_class_data_visibility (decl);
2157 /* Constrain the visibility of a class TYPE based on the visibility of its
2158 field types. Warn if any fields require lesser visibility. */
2161 constrain_class_visibility (tree type)
2167 int vis = type_visibility (type);
2169 if (vis == VISIBILITY_ANON
2170 || DECL_IN_SYSTEM_HEADER (TYPE_MAIN_DECL (type)))
2173 /* Don't warn about visibility if the class has explicit visibility. */
2174 if (CLASSTYPE_VISIBILITY_SPECIFIED (type))
2175 vis = VISIBILITY_INTERNAL;
2177 for (t = TYPE_FIELDS (type); t; t = TREE_CHAIN (t))
2178 if (TREE_CODE (t) == FIELD_DECL && TREE_TYPE (t) != error_mark_node)
2180 tree ftype = strip_pointer_or_array_types (TREE_TYPE (t));
2181 int subvis = type_visibility (ftype);
2183 if (subvis == VISIBILITY_ANON)
2185 if (!in_main_input_context ())
2187 %qT has a field %qD whose type uses the anonymous namespace",
2190 else if (MAYBE_CLASS_TYPE_P (ftype)
2191 && vis < VISIBILITY_HIDDEN
2192 && subvis >= VISIBILITY_HIDDEN)
2193 warning (OPT_Wattributes, "\
2194 %qT declared with greater visibility than the type of its field %qD",
2198 binfo = TYPE_BINFO (type);
2199 for (i = 0; BINFO_BASE_ITERATE (binfo, i, t); ++i)
2201 int subvis = type_visibility (TREE_TYPE (t));
2203 if (subvis == VISIBILITY_ANON)
2205 if (!in_main_input_context())
2207 %qT has a base %qT whose type uses the anonymous namespace",
2208 type, TREE_TYPE (t));
2210 else if (vis < VISIBILITY_HIDDEN
2211 && subvis >= VISIBILITY_HIDDEN)
2212 warning (OPT_Wattributes, "\
2213 %qT declared with greater visibility than its base %qT",
2214 type, TREE_TYPE (t));
2218 /* DECL is a FUNCTION_DECL or VAR_DECL. If the object file linkage
2219 for DECL has not already been determined, do so now by setting
2220 DECL_EXTERNAL, DECL_COMDAT and other related flags. Until this
2221 function is called entities with vague linkage whose definitions
2222 are available must have TREE_PUBLIC set.
2224 If this function decides to place DECL in COMDAT, it will set
2225 appropriate flags -- but will not clear DECL_EXTERNAL. It is up to
2226 the caller to decide whether or not to clear DECL_EXTERNAL. Some
2227 callers defer that decision until it is clear that DECL is actually
2231 import_export_decl (tree decl)
2236 tree class_type = NULL_TREE;
2238 if (DECL_INTERFACE_KNOWN (decl))
2241 /* We cannot determine what linkage to give to an entity with vague
2242 linkage until the end of the file. For example, a virtual table
2243 for a class will be defined if and only if the key method is
2244 defined in this translation unit. As a further example, consider
2245 that when compiling a translation unit that uses PCH file with
2246 "-frepo" it would be incorrect to make decisions about what
2247 entities to emit when building the PCH; those decisions must be
2248 delayed until the repository information has been processed. */
2249 gcc_assert (at_eof);
2250 /* Object file linkage for explicit instantiations is handled in
2251 mark_decl_instantiated. For static variables in functions with
2252 vague linkage, maybe_commonize_var is used.
2254 Therefore, the only declarations that should be provided to this
2255 function are those with external linkage that are:
2257 * implicit instantiations of function templates
2261 * implicit instantiations of static data members of class
2268 Furthermore, all entities that reach this point must have a
2269 definition available in this translation unit.
2271 The following assertions check these conditions. */
2272 gcc_assert (TREE_CODE (decl) == FUNCTION_DECL
2273 || TREE_CODE (decl) == VAR_DECL);
2274 /* Any code that creates entities with TREE_PUBLIC cleared should
2275 also set DECL_INTERFACE_KNOWN. */
2276 gcc_assert (TREE_PUBLIC (decl));
2277 if (TREE_CODE (decl) == FUNCTION_DECL)
2278 gcc_assert (DECL_IMPLICIT_INSTANTIATION (decl)
2279 || DECL_FRIEND_PSEUDO_TEMPLATE_INSTANTIATION (decl)
2280 || DECL_DECLARED_INLINE_P (decl));
2282 gcc_assert (DECL_IMPLICIT_INSTANTIATION (decl)
2283 || DECL_VTABLE_OR_VTT_P (decl)
2284 || DECL_TINFO_P (decl));
2285 /* Check that a definition of DECL is available in this translation
2287 gcc_assert (!DECL_REALLY_EXTERN (decl));
2289 /* Assume that DECL will not have COMDAT linkage. */
2291 /* Assume that DECL will not be imported into this translation
2295 /* See if the repository tells us whether or not to emit DECL in
2296 this translation unit. */
2297 emit_p = repo_emit_p (decl);
2300 else if (emit_p == 1)
2302 /* The repository indicates that this entity should be defined
2303 here. Make sure the back end honors that request. */
2304 if (TREE_CODE (decl) == VAR_DECL)
2306 else if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (decl)
2307 || DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P (decl))
2310 FOR_EACH_CLONE (clone, decl)
2311 mark_needed (clone);
2315 /* Output the definition as an ordinary strong definition. */
2316 DECL_EXTERNAL (decl) = 0;
2317 DECL_INTERFACE_KNOWN (decl) = 1;
2322 /* We have already decided what to do with this DECL; there is no
2323 need to check anything further. */
2325 else if (TREE_CODE (decl) == VAR_DECL && DECL_VTABLE_OR_VTT_P (decl))
2327 class_type = DECL_CONTEXT (decl);
2328 import_export_class (class_type);
2329 if (TYPE_FOR_JAVA (class_type))
2331 else if (CLASSTYPE_INTERFACE_KNOWN (class_type)
2332 && CLASSTYPE_INTERFACE_ONLY (class_type))
2334 else if ((!flag_weak || TARGET_WEAK_NOT_IN_ARCHIVE_TOC)
2335 && !CLASSTYPE_USE_TEMPLATE (class_type)
2336 && CLASSTYPE_KEY_METHOD (class_type)
2337 && !DECL_DECLARED_INLINE_P (CLASSTYPE_KEY_METHOD (class_type)))
2338 /* The ABI requires that all virtual tables be emitted with
2339 COMDAT linkage. However, on systems where COMDAT symbols
2340 don't show up in the table of contents for a static
2341 archive, or on systems without weak symbols (where we
2342 approximate COMDAT linkage by using internal linkage), the
2343 linker will report errors about undefined symbols because
2344 it will not see the virtual table definition. Therefore,
2345 in the case that we know that the virtual table will be
2346 emitted in only one translation unit, we make the virtual
2347 table an ordinary definition with external linkage. */
2348 DECL_EXTERNAL (decl) = 0;
2349 else if (CLASSTYPE_INTERFACE_KNOWN (class_type))
2351 /* CLASS_TYPE is being exported from this translation unit,
2352 so DECL should be defined here. */
2353 if (!flag_weak && CLASSTYPE_EXPLICIT_INSTANTIATION (class_type))
2354 /* If a class is declared in a header with the "extern
2355 template" extension, then it will not be instantiated,
2356 even in translation units that would normally require
2357 it. Often such classes are explicitly instantiated in
2358 one translation unit. Therefore, the explicit
2359 instantiation must be made visible to other translation
2361 DECL_EXTERNAL (decl) = 0;
2364 /* The generic C++ ABI says that class data is always
2365 COMDAT, even if there is a key function. Some
2366 variants (e.g., the ARM EABI) says that class data
2367 only has COMDAT linkage if the class data might be
2368 emitted in more than one translation unit. When the
2369 key method can be inline and is inline, we still have
2370 to arrange for comdat even though
2371 class_data_always_comdat is false. */
2372 if (!CLASSTYPE_KEY_METHOD (class_type)
2373 || DECL_DECLARED_INLINE_P (CLASSTYPE_KEY_METHOD (class_type))
2374 || targetm.cxx.class_data_always_comdat ())
2376 /* The ABI requires COMDAT linkage. Normally, we
2377 only emit COMDAT things when they are needed;
2378 make sure that we realize that this entity is
2385 else if (!flag_implicit_templates
2386 && CLASSTYPE_IMPLICIT_INSTANTIATION (class_type))
2391 else if (TREE_CODE (decl) == VAR_DECL && DECL_TINFO_P (decl))
2393 tree type = TREE_TYPE (DECL_NAME (decl));
2394 if (CLASS_TYPE_P (type))
2397 import_export_class (type);
2398 if (CLASSTYPE_INTERFACE_KNOWN (type)
2399 && TYPE_POLYMORPHIC_P (type)
2400 && CLASSTYPE_INTERFACE_ONLY (type)
2401 /* If -fno-rtti was specified, then we cannot be sure
2402 that RTTI information will be emitted with the
2403 virtual table of the class, so we must emit it
2404 wherever it is used. */
2409 if (CLASSTYPE_INTERFACE_KNOWN (type)
2410 && !CLASSTYPE_INTERFACE_ONLY (type))
2412 comdat_p = (targetm.cxx.class_data_always_comdat ()
2413 || (CLASSTYPE_KEY_METHOD (type)
2414 && DECL_DECLARED_INLINE_P (CLASSTYPE_KEY_METHOD (type))));
2419 DECL_EXTERNAL (decl) = 0;
2429 else if (DECL_TEMPLATE_INSTANTIATION (decl)
2430 || DECL_FRIEND_PSEUDO_TEMPLATE_INSTANTIATION (decl))
2432 /* DECL is an implicit instantiation of a function or static
2434 if ((flag_implicit_templates
2435 && !flag_use_repository)
2436 || (flag_implicit_inline_templates
2437 && TREE_CODE (decl) == FUNCTION_DECL
2438 && DECL_DECLARED_INLINE_P (decl)))
2441 /* If we are not implicitly generating templates, then mark
2442 this entity as undefined in this translation unit. */
2445 else if (DECL_FUNCTION_MEMBER_P (decl))
2447 if (!DECL_DECLARED_INLINE_P (decl))
2449 tree ctype = DECL_CONTEXT (decl);
2450 import_export_class (ctype);
2451 if (CLASSTYPE_INTERFACE_KNOWN (ctype))
2453 DECL_NOT_REALLY_EXTERN (decl)
2454 = ! (CLASSTYPE_INTERFACE_ONLY (ctype)
2455 || (DECL_DECLARED_INLINE_P (decl)
2456 && ! flag_implement_inlines
2457 && !DECL_VINDEX (decl)));
2459 if (!DECL_NOT_REALLY_EXTERN (decl))
2460 DECL_EXTERNAL (decl) = 1;
2462 /* Always make artificials weak. */
2463 if (DECL_ARTIFICIAL (decl) && flag_weak)
2466 maybe_make_one_only (decl);
2477 /* If we are importing DECL into this translation unit, mark is
2478 an undefined here. */
2479 DECL_EXTERNAL (decl) = 1;
2480 DECL_NOT_REALLY_EXTERN (decl) = 0;
2484 /* If we decided to put DECL in COMDAT, mark it accordingly at
2486 comdat_linkage (decl);
2489 DECL_INTERFACE_KNOWN (decl) = 1;
2492 /* Return an expression that performs the destruction of DECL, which
2493 must be a VAR_DECL whose type has a non-trivial destructor, or is
2494 an array whose (innermost) elements have a non-trivial destructor. */
2497 build_cleanup (tree decl)
2500 tree type = TREE_TYPE (decl);
2502 /* This function should only be called for declarations that really
2503 require cleanups. */
2504 gcc_assert (!TYPE_HAS_TRIVIAL_DESTRUCTOR (type));
2506 /* Treat all objects with destructors as used; the destructor may do
2507 something substantive. */
2510 if (TREE_CODE (type) == ARRAY_TYPE)
2513 temp = build_address (decl);
2514 temp = build_delete (TREE_TYPE (temp), temp,
2515 sfk_complete_destructor,
2516 LOOKUP_NORMAL|LOOKUP_NONVIRTUAL|LOOKUP_DESTRUCTOR, 0);
2520 /* Returns the initialization guard variable for the variable DECL,
2521 which has static storage duration. */
2524 get_guard (tree decl)
2529 sname = mangle_guard_variable (decl);
2530 guard = IDENTIFIER_GLOBAL_VALUE (sname);
2535 /* We use a type that is big enough to contain a mutex as well
2536 as an integer counter. */
2537 guard_type = targetm.cxx.guard_type ();
2538 guard = build_decl (DECL_SOURCE_LOCATION (decl),
2539 VAR_DECL, sname, guard_type);
2541 /* The guard should have the same linkage as what it guards. */
2542 TREE_PUBLIC (guard) = TREE_PUBLIC (decl);
2543 TREE_STATIC (guard) = TREE_STATIC (decl);
2544 DECL_COMMON (guard) = DECL_COMMON (decl);
2545 DECL_COMDAT_GROUP (guard) = DECL_COMDAT_GROUP (decl);
2546 if (TREE_PUBLIC (decl))
2547 DECL_WEAK (guard) = DECL_WEAK (decl);
2548 DECL_VISIBILITY (guard) = DECL_VISIBILITY (decl);
2549 DECL_VISIBILITY_SPECIFIED (guard) = DECL_VISIBILITY_SPECIFIED (decl);
2551 DECL_ARTIFICIAL (guard) = 1;
2552 DECL_IGNORED_P (guard) = 1;
2553 TREE_USED (guard) = 1;
2554 pushdecl_top_level_and_finish (guard, NULL_TREE);
2559 /* Return those bits of the GUARD variable that should be set when the
2560 guarded entity is actually initialized. */
2563 get_guard_bits (tree guard)
2565 if (!targetm.cxx.guard_mask_bit ())
2567 /* We only set the first byte of the guard, in order to leave room
2568 for a mutex in the high-order bits. */
2569 guard = build1 (ADDR_EXPR,
2570 build_pointer_type (TREE_TYPE (guard)),
2572 guard = build1 (NOP_EXPR,
2573 build_pointer_type (char_type_node),
2575 guard = build1 (INDIRECT_REF, char_type_node, guard);
2581 /* Return an expression which determines whether or not the GUARD
2582 variable has already been initialized. */
2585 get_guard_cond (tree guard)
2589 /* Check to see if the GUARD is zero. */
2590 guard = get_guard_bits (guard);
2592 /* Mask off all but the low bit. */
2593 if (targetm.cxx.guard_mask_bit ())
2595 guard_value = integer_one_node;
2596 if (!same_type_p (TREE_TYPE (guard_value), TREE_TYPE (guard)))
2597 guard_value = convert (TREE_TYPE (guard), guard_value);
2598 guard = cp_build_binary_op (input_location,
2599 BIT_AND_EXPR, guard, guard_value,
2600 tf_warning_or_error);
2603 guard_value = integer_zero_node;
2604 if (!same_type_p (TREE_TYPE (guard_value), TREE_TYPE (guard)))
2605 guard_value = convert (TREE_TYPE (guard), guard_value);
2606 return cp_build_binary_op (input_location,
2607 EQ_EXPR, guard, guard_value,
2608 tf_warning_or_error);
2611 /* Return an expression which sets the GUARD variable, indicating that
2612 the variable being guarded has been initialized. */
2615 set_guard (tree guard)
2619 /* Set the GUARD to one. */
2620 guard = get_guard_bits (guard);
2621 guard_init = integer_one_node;
2622 if (!same_type_p (TREE_TYPE (guard_init), TREE_TYPE (guard)))
2623 guard_init = convert (TREE_TYPE (guard), guard_init);
2624 return cp_build_modify_expr (guard, NOP_EXPR, guard_init,
2625 tf_warning_or_error);
2628 /* Start the process of running a particular set of global constructors
2629 or destructors. Subroutine of do_[cd]tors. */
2632 start_objects (int method_type, int initp)
2638 /* Make ctor or dtor function. METHOD_TYPE may be 'I' or 'D'. */
2640 if (initp != DEFAULT_INIT_PRIORITY)
2650 sprintf (type, "%c%c%.5u", method_type, joiner, initp);
2653 sprintf (type, "%c", method_type);
2655 fndecl = build_lang_decl (FUNCTION_DECL,
2656 get_file_function_name (type),
2657 build_function_type (void_type_node,
2659 start_preparsed_function (fndecl, /*attrs=*/NULL_TREE, SF_PRE_PARSED);
2661 TREE_PUBLIC (current_function_decl) = 0;
2663 /* Mark as artificial because it's not explicitly in the user's
2665 DECL_ARTIFICIAL (current_function_decl) = 1;
2667 /* Mark this declaration as used to avoid spurious warnings. */
2668 TREE_USED (current_function_decl) = 1;
2670 /* Mark this function as a global constructor or destructor. */
2671 if (method_type == 'I')
2672 DECL_GLOBAL_CTOR_P (current_function_decl) = 1;
2674 DECL_GLOBAL_DTOR_P (current_function_decl) = 1;
2676 body = begin_compound_stmt (BCS_FN_BODY);
2681 /* Finish the process of running a particular set of global constructors
2682 or destructors. Subroutine of do_[cd]tors. */
2685 finish_objects (int method_type, int initp, tree body)
2690 finish_compound_stmt (body);
2691 fn = finish_function (0);
2693 if (method_type == 'I')
2695 DECL_STATIC_CONSTRUCTOR (fn) = 1;
2696 decl_init_priority_insert (fn, initp);
2700 DECL_STATIC_DESTRUCTOR (fn) = 1;
2701 decl_fini_priority_insert (fn, initp);
2704 expand_or_defer_fn (fn);
2707 /* The names of the parameters to the function created to handle
2708 initializations and destructions for objects with static storage
2710 #define INITIALIZE_P_IDENTIFIER "__initialize_p"
2711 #define PRIORITY_IDENTIFIER "__priority"
2713 /* The name of the function we create to handle initializations and
2714 destructions for objects with static storage duration. */
2715 #define SSDF_IDENTIFIER "__static_initialization_and_destruction"
2717 /* The declaration for the __INITIALIZE_P argument. */
2718 static GTY(()) tree initialize_p_decl;
2720 /* The declaration for the __PRIORITY argument. */
2721 static GTY(()) tree priority_decl;
2723 /* The declaration for the static storage duration function. */
2724 static GTY(()) tree ssdf_decl;
2726 /* All the static storage duration functions created in this
2727 translation unit. */
2728 static GTY(()) VEC(tree,gc) *ssdf_decls;
2730 /* A map from priority levels to information about that priority
2731 level. There may be many such levels, so efficient lookup is
2733 static splay_tree priority_info_map;
2735 /* Begins the generation of the function that will handle all
2736 initialization and destruction of objects with static storage
2737 duration. The function generated takes two parameters of type
2738 `int': __INITIALIZE_P and __PRIORITY. If __INITIALIZE_P is
2739 nonzero, it performs initializations. Otherwise, it performs
2740 destructions. It only performs those initializations or
2741 destructions with the indicated __PRIORITY. The generated function
2744 It is assumed that this function will only be called once per
2745 translation unit. */
2748 start_static_storage_duration_function (unsigned count)
2753 char id[sizeof (SSDF_IDENTIFIER) + 1 /* '\0' */ + 32];
2755 /* Create the identifier for this function. It will be of the form
2756 SSDF_IDENTIFIER_<number>. */
2757 sprintf (id, "%s_%u", SSDF_IDENTIFIER, count);
2759 /* Create the parameters. */
2760 parm_types = void_list_node;
2761 parm_types = tree_cons (NULL_TREE, integer_type_node, parm_types);
2762 parm_types = tree_cons (NULL_TREE, integer_type_node, parm_types);
2763 type = build_function_type (void_type_node, parm_types);
2765 /* Create the FUNCTION_DECL itself. */
2766 ssdf_decl = build_lang_decl (FUNCTION_DECL,
2767 get_identifier (id),
2769 TREE_PUBLIC (ssdf_decl) = 0;
2770 DECL_ARTIFICIAL (ssdf_decl) = 1;
2772 /* Put this function in the list of functions to be called from the
2773 static constructors and destructors. */
2776 ssdf_decls = VEC_alloc (tree, gc, 32);
2778 /* Take this opportunity to initialize the map from priority
2779 numbers to information about that priority level. */
2780 priority_info_map = splay_tree_new (splay_tree_compare_ints,
2781 /*delete_key_fn=*/0,
2782 /*delete_value_fn=*/
2783 (splay_tree_delete_value_fn) &free);
2785 /* We always need to generate functions for the
2786 DEFAULT_INIT_PRIORITY so enter it now. That way when we walk
2787 priorities later, we'll be sure to find the
2788 DEFAULT_INIT_PRIORITY. */
2789 get_priority_info (DEFAULT_INIT_PRIORITY);
2792 VEC_safe_push (tree, gc, ssdf_decls, ssdf_decl);
2794 /* Create the argument list. */
2795 initialize_p_decl = cp_build_parm_decl
2796 (get_identifier (INITIALIZE_P_IDENTIFIER), integer_type_node);
2797 DECL_CONTEXT (initialize_p_decl) = ssdf_decl;
2798 TREE_USED (initialize_p_decl) = 1;
2799 priority_decl = cp_build_parm_decl
2800 (get_identifier (PRIORITY_IDENTIFIER), integer_type_node);
2801 DECL_CONTEXT (priority_decl) = ssdf_decl;
2802 TREE_USED (priority_decl) = 1;
2804 TREE_CHAIN (initialize_p_decl) = priority_decl;
2805 DECL_ARGUMENTS (ssdf_decl) = initialize_p_decl;
2807 /* Put the function in the global scope. */
2808 pushdecl (ssdf_decl);
2810 /* Start the function itself. This is equivalent to declaring the
2813 static void __ssdf (int __initialize_p, init __priority_p);
2815 It is static because we only need to call this function from the
2816 various constructor and destructor functions for this module. */
2817 start_preparsed_function (ssdf_decl,
2818 /*attrs=*/NULL_TREE,
2821 /* Set up the scope of the outermost block in the function. */
2822 body = begin_compound_stmt (BCS_FN_BODY);
2827 /* Finish the generation of the function which performs initialization
2828 and destruction of objects with static storage duration. After
2829 this point, no more such objects can be created. */
2832 finish_static_storage_duration_function (tree body)
2834 /* Close out the function. */
2835 finish_compound_stmt (body);
2836 expand_or_defer_fn (finish_function (0));
2839 /* Return the information about the indicated PRIORITY level. If no
2840 code to handle this level has yet been generated, generate the
2841 appropriate prologue. */
2843 static priority_info
2844 get_priority_info (int priority)
2849 n = splay_tree_lookup (priority_info_map,
2850 (splay_tree_key) priority);
2853 /* Create a new priority information structure, and insert it
2855 pi = XNEW (struct priority_info_s);
2856 pi->initializations_p = 0;
2857 pi->destructions_p = 0;
2858 splay_tree_insert (priority_info_map,
2859 (splay_tree_key) priority,
2860 (splay_tree_value) pi);
2863 pi = (priority_info) n->value;
2868 /* The effective initialization priority of a DECL. */
2870 #define DECL_EFFECTIVE_INIT_PRIORITY(decl) \
2871 ((!DECL_HAS_INIT_PRIORITY_P (decl) || DECL_INIT_PRIORITY (decl) == 0) \
2872 ? DEFAULT_INIT_PRIORITY : DECL_INIT_PRIORITY (decl))
2874 /* Whether a DECL needs a guard to protect it against multiple
2877 #define NEEDS_GUARD_P(decl) (TREE_PUBLIC (decl) && (DECL_COMMON (decl) \
2878 || DECL_ONE_ONLY (decl) \
2879 || DECL_WEAK (decl)))
2881 /* Called from one_static_initialization_or_destruction(),
2883 Walks the initializer list of a global variable and looks for
2884 temporary variables (DECL_NAME() == NULL and DECL_ARTIFICIAL != 0)
2885 and that have their DECL_CONTEXT() == NULL.
2886 For each such temporary variable, set their DECL_CONTEXT() to
2887 the current function. This is necessary because otherwise
2888 some optimizers (enabled by -O2 -fprofile-arcs) might crash
2889 when trying to refer to a temporary variable that does not have
2890 it's DECL_CONTECT() properly set. */
2892 fix_temporary_vars_context_r (tree *node,
2893 int *unused ATTRIBUTE_UNUSED,
2894 void *unused1 ATTRIBUTE_UNUSED)
2896 gcc_assert (current_function_decl);
2898 if (TREE_CODE (*node) == BIND_EXPR)
2902 for (var = BIND_EXPR_VARS (*node); var; var = TREE_CHAIN (var))
2903 if (TREE_CODE (var) == VAR_DECL
2905 && DECL_ARTIFICIAL (var)
2906 && !DECL_CONTEXT (var))
2907 DECL_CONTEXT (var) = current_function_decl;
2913 /* Set up to handle the initialization or destruction of DECL. If
2914 INITP is nonzero, we are initializing the variable. Otherwise, we
2915 are destroying it. */
2918 one_static_initialization_or_destruction (tree decl, tree init, bool initp)
2920 tree guard_if_stmt = NULL_TREE;
2923 /* If we are supposed to destruct and there's a trivial destructor,
2924 nothing has to be done. */
2926 && TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
2929 /* Trick the compiler into thinking we are at the file and line
2930 where DECL was declared so that error-messages make sense, and so
2931 that the debugger will show somewhat sensible file and line
2933 input_location = DECL_SOURCE_LOCATION (decl);
2935 /* Make sure temporary variables in the initialiser all have
2936 their DECL_CONTEXT() set to a value different from NULL_TREE.
2937 This can happen when global variables initialisers are built.
2938 In that case, the DECL_CONTEXT() of the global variables _AND_ of all
2939 the temporary variables that might have been generated in the
2940 accompagning initialisers is NULL_TREE, meaning the variables have been
2941 declared in the global namespace.
2942 What we want to do here is to fix that and make sure the DECL_CONTEXT()
2943 of the temporaries are set to the current function decl. */
2944 cp_walk_tree_without_duplicates (&init,
2945 fix_temporary_vars_context_r,
2952 Access control for implicit calls to the constructors,
2953 the conversion functions, or the destructor called to
2954 create and destroy a static data member is performed as
2955 if these calls appeared in the scope of the member's
2958 we pretend we are in a static member function of the class of
2959 which the DECL is a member. */
2960 if (member_p (decl))
2962 DECL_CONTEXT (current_function_decl) = DECL_CONTEXT (decl);
2963 DECL_STATIC_FUNCTION_P (current_function_decl) = 1;
2966 /* Assume we don't need a guard. */
2968 /* We need a guard if this is an object with external linkage that
2969 might be initialized in more than one place. (For example, a
2970 static data member of a template, when the data member requires
2972 if (NEEDS_GUARD_P (decl))
2976 guard = get_guard (decl);
2978 /* When using __cxa_atexit, we just check the GUARD as we would
2979 for a local static. */
2980 if (flag_use_cxa_atexit)
2982 /* When using __cxa_atexit, we never try to destroy
2983 anything from a static destructor. */
2985 guard_cond = get_guard_cond (guard);
2987 /* If we don't have __cxa_atexit, then we will be running
2988 destructors from .fini sections, or their equivalents. So,
2989 we need to know how many times we've tried to initialize this
2990 object. We do initializations only if the GUARD is zero,
2991 i.e., if we are the first to initialize the variable. We do
2992 destructions only if the GUARD is one, i.e., if we are the
2993 last to destroy the variable. */
2996 = cp_build_binary_op (input_location,
2998 cp_build_unary_op (PREINCREMENT_EXPR,
3001 tf_warning_or_error),
3003 tf_warning_or_error);
3006 = cp_build_binary_op (input_location,
3008 cp_build_unary_op (PREDECREMENT_EXPR,
3011 tf_warning_or_error),
3013 tf_warning_or_error);
3015 guard_if_stmt = begin_if_stmt ();
3016 finish_if_stmt_cond (guard_cond, guard_if_stmt);
3020 /* If we're using __cxa_atexit, we have not already set the GUARD,
3021 so we must do so now. */
3022 if (guard && initp && flag_use_cxa_atexit)
3023 finish_expr_stmt (set_guard (guard));
3025 /* Perform the initialization or destruction. */
3029 finish_expr_stmt (init);
3031 /* If we're using __cxa_atexit, register a function that calls the
3032 destructor for the object. */
3033 if (flag_use_cxa_atexit)
3034 finish_expr_stmt (register_dtor_fn (decl));
3037 finish_expr_stmt (build_cleanup (decl));
3039 /* Finish the guard if-stmt, if necessary. */
3042 finish_then_clause (guard_if_stmt);
3043 finish_if_stmt (guard_if_stmt);
3046 /* Now that we're done with DECL we don't need to pretend to be a
3047 member of its class any longer. */
3048 DECL_CONTEXT (current_function_decl) = NULL_TREE;
3049 DECL_STATIC_FUNCTION_P (current_function_decl) = 0;
3052 /* Generate code to do the initialization or destruction of the decls in VARS,
3053 a TREE_LIST of VAR_DECL with static storage duration.
3054 Whether initialization or destruction is performed is specified by INITP. */
3057 do_static_initialization_or_destruction (tree vars, bool initp)
3059 tree node, init_if_stmt, cond;
3061 /* Build the outer if-stmt to check for initialization or destruction. */
3062 init_if_stmt = begin_if_stmt ();
3063 cond = initp ? integer_one_node : integer_zero_node;
3064 cond = cp_build_binary_op (input_location,
3068 tf_warning_or_error);
3069 finish_if_stmt_cond (cond, init_if_stmt);
3073 tree decl = TREE_VALUE (node);
3074 tree priority_if_stmt;
3078 /* If we don't need a destructor, there's nothing to do. Avoid
3079 creating a possibly empty if-stmt. */
3080 if (!initp && TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
3082 node = TREE_CHAIN (node);
3086 /* Remember that we had an initialization or finalization at this
3088 priority = DECL_EFFECTIVE_INIT_PRIORITY (decl);
3089 pi = get_priority_info (priority);
3091 pi->initializations_p = 1;
3093 pi->destructions_p = 1;
3095 /* Conditionalize this initialization on being in the right priority
3096 and being initializing/finalizing appropriately. */
3097 priority_if_stmt = begin_if_stmt ();
3098 cond = cp_build_binary_op (input_location,
3101 build_int_cst (NULL_TREE, priority),
3102 tf_warning_or_error);
3103 finish_if_stmt_cond (cond, priority_if_stmt);
3105 /* Process initializers with same priority. */
3107 && DECL_EFFECTIVE_INIT_PRIORITY (TREE_VALUE (node)) == priority;
3108 node = TREE_CHAIN (node))
3109 /* Do one initialization or destruction. */
3110 one_static_initialization_or_destruction (TREE_VALUE (node),
3111 TREE_PURPOSE (node), initp);
3113 /* Finish up the priority if-stmt body. */
3114 finish_then_clause (priority_if_stmt);
3115 finish_if_stmt (priority_if_stmt);
3119 /* Finish up the init/destruct if-stmt body. */
3120 finish_then_clause (init_if_stmt);
3121 finish_if_stmt (init_if_stmt);
3124 /* VARS is a list of variables with static storage duration which may
3125 need initialization and/or finalization. Remove those variables
3126 that don't really need to be initialized or finalized, and return
3127 the resulting list. The order in which the variables appear in
3128 VARS is in reverse order of the order in which they should actually
3129 be initialized. The list we return is in the unreversed order;
3130 i.e., the first variable should be initialized first. */
3133 prune_vars_needing_no_initialization (tree *vars)
3136 tree result = NULL_TREE;
3141 tree decl = TREE_VALUE (t);
3142 tree init = TREE_PURPOSE (t);
3144 /* Deal gracefully with error. */
3145 if (decl == error_mark_node)
3147 var = &TREE_CHAIN (t);
3151 /* The only things that can be initialized are variables. */
3152 gcc_assert (TREE_CODE (decl) == VAR_DECL);
3154 /* If this object is not defined, we don't need to do anything
3156 if (DECL_EXTERNAL (decl))
3158 var = &TREE_CHAIN (t);
3162 /* Also, if the initializer already contains errors, we can bail
3164 if (init && TREE_CODE (init) == TREE_LIST
3165 && value_member (error_mark_node, init))
3167 var = &TREE_CHAIN (t);
3171 /* This variable is going to need initialization and/or
3172 finalization, so we add it to the list. */
3173 *var = TREE_CHAIN (t);
3174 TREE_CHAIN (t) = result;
3181 /* Make sure we have told the back end about all the variables in
3185 write_out_vars (tree vars)
3189 for (v = vars; v; v = TREE_CHAIN (v))
3191 tree var = TREE_VALUE (v);
3192 if (!var_finalized_p (var))
3194 import_export_decl (var);
3195 rest_of_decl_compilation (var, 1, 1);
3200 /* Generate a static constructor (if CONSTRUCTOR_P) or destructor
3201 (otherwise) that will initialize all global objects with static
3202 storage duration having the indicated PRIORITY. */
3205 generate_ctor_or_dtor_function (bool constructor_p, int priority,
3214 input_location = *locus;
3216 /* Was: locus->line++; */
3218 /* We use `I' to indicate initialization and `D' to indicate
3220 function_key = constructor_p ? 'I' : 'D';
3222 /* We emit the function lazily, to avoid generating empty
3223 global constructors and destructors. */
3226 /* For Objective-C++, we may need to initialize metadata found in this module.
3227 This must be done _before_ any other static initializations. */
3228 if (c_dialect_objc () && (priority == DEFAULT_INIT_PRIORITY)
3229 && constructor_p && objc_static_init_needed_p ())
3231 body = start_objects (function_key, priority);
3232 objc_generate_static_init_call (NULL_TREE);
3235 /* Call the static storage duration function with appropriate
3237 for (i = 0; VEC_iterate (tree, ssdf_decls, i, fndecl); ++i)
3239 /* Calls to pure or const functions will expand to nothing. */
3240 if (! (flags_from_decl_or_type (fndecl) & (ECF_CONST | ECF_PURE)))
3243 body = start_objects (function_key, priority);
3245 arguments = tree_cons (NULL_TREE,
3246 build_int_cst (NULL_TREE, priority),
3248 arguments = tree_cons (NULL_TREE,
3249 build_int_cst (NULL_TREE, constructor_p),
3251 finish_expr_stmt (cp_build_function_call (fndecl, arguments,
3252 tf_warning_or_error));
3256 /* Close out the function. */
3258 finish_objects (function_key, priority, body);
3261 /* Generate constructor and destructor functions for the priority
3265 generate_ctor_and_dtor_functions_for_priority (splay_tree_node n, void * data)
3267 location_t *locus = (location_t *) data;
3268 int priority = (int) n->key;
3269 priority_info pi = (priority_info) n->value;
3271 /* Generate the functions themselves, but only if they are really
3273 if (pi->initializations_p)
3274 generate_ctor_or_dtor_function (/*constructor_p=*/true, priority, locus);
3275 if (pi->destructions_p)
3276 generate_ctor_or_dtor_function (/*constructor_p=*/false, priority, locus);
3278 /* Keep iterating. */
3282 /* Called via LANGHOOK_CALLGRAPH_ANALYZE_EXPR. It is supposed to mark
3283 decls referenced from front-end specific constructs; it will be called
3284 only for language-specific tree nodes.
3286 Here we must deal with member pointers. */
3289 cxx_callgraph_analyze_expr (tree *tp, int *walk_subtrees ATTRIBUTE_UNUSED)
3293 switch (TREE_CODE (t))
3296 if (TYPE_PTRMEMFUNC_P (TREE_TYPE (t)))
3297 cgraph_mark_address_taken_node (cgraph_node (PTRMEM_CST_MEMBER (t)));
3300 if (TREE_CODE (BASELINK_FUNCTIONS (t)) == FUNCTION_DECL)
3301 cgraph_mark_address_taken_node (cgraph_node (BASELINK_FUNCTIONS (t)));
3304 if (DECL_VTABLE_OR_VTT_P (t))
3306 /* The ABI requires that all virtual tables be emitted
3307 whenever one of them is. */
3309 for (vtbl = CLASSTYPE_VTABLES (DECL_CONTEXT (t));
3311 vtbl = TREE_CHAIN (vtbl))
3312 mark_decl_referenced (vtbl);
3314 else if (DECL_CONTEXT (t)
3315 && TREE_CODE (DECL_CONTEXT (t)) == FUNCTION_DECL)
3316 /* If we need a static variable in a function, then we
3317 need the containing function. */
3318 mark_decl_referenced (DECL_CONTEXT (t));
3327 /* Java requires that we be able to reference a local address for a
3328 method, and not be confused by PLT entries. If hidden aliases are
3329 supported, collect and return all the functions for which we should
3330 emit a hidden alias. */
3332 static struct pointer_set_t *
3333 collect_candidates_for_java_method_aliases (void)
3335 struct cgraph_node *node;
3336 struct pointer_set_t *candidates = NULL;
3338 #ifndef HAVE_GAS_HIDDEN
3342 for (node = cgraph_nodes; node ; node = node->next)
3344 tree fndecl = node->decl;
3346 if (DECL_CONTEXT (fndecl)
3347 && TYPE_P (DECL_CONTEXT (fndecl))
3348 && TYPE_FOR_JAVA (DECL_CONTEXT (fndecl))
3349 && TARGET_USE_LOCAL_THUNK_ALIAS_P (fndecl))
3351 if (candidates == NULL)
3352 candidates = pointer_set_create ();
3353 pointer_set_insert (candidates, fndecl);
3361 /* Java requires that we be able to reference a local address for a
3362 method, and not be confused by PLT entries. If hidden aliases are
3363 supported, emit one for each java function that we've emitted.
3364 CANDIDATES is the set of FUNCTION_DECLs that were gathered
3365 by collect_candidates_for_java_method_aliases. */
3368 build_java_method_aliases (struct pointer_set_t *candidates)
3370 struct cgraph_node *node;
3372 #ifndef HAVE_GAS_HIDDEN
3376 for (node = cgraph_nodes; node ; node = node->next)
3378 tree fndecl = node->decl;
3380 if (TREE_ASM_WRITTEN (fndecl)
3381 && pointer_set_contains (candidates, fndecl))
3383 /* Mangle the name in a predictable way; we need to reference
3384 this from a java compiled object file. */
3385 tree oid, nid, alias;
3389 oid = DECL_ASSEMBLER_NAME (fndecl);
3390 oname = IDENTIFIER_POINTER (oid);
3391 gcc_assert (oname[0] == '_' && oname[1] == 'Z');
3392 nname = ACONCAT (("_ZGA", oname+2, NULL));
3393 nid = get_identifier (nname);
3395 alias = make_alias_for (fndecl, nid);
3396 TREE_PUBLIC (alias) = 1;
3397 DECL_VISIBILITY (alias) = VISIBILITY_HIDDEN;
3399 assemble_alias (alias, oid);
3404 /* Returns true iff there is a definition available for variable or
3408 decl_defined_p (tree decl)
3410 if (TREE_CODE (decl) == FUNCTION_DECL)
3411 return (DECL_INITIAL (decl) != NULL_TREE);
3414 gcc_assert (TREE_CODE (decl) == VAR_DECL);
3415 return !DECL_EXTERNAL (decl);
3419 /* Complain that DECL uses a type with no linkage but is never defined. */
3422 no_linkage_error (tree decl)
3424 tree t = no_linkage_check (TREE_TYPE (decl), /*relaxed_p=*/false);
3425 if (TYPE_ANONYMOUS_P (t))
3427 permerror (0, "%q+#D, declared using anonymous type, "
3428 "is used but never defined", decl);
3429 if (is_typedef_decl (TYPE_NAME (t)))
3430 permerror (0, "%q+#D does not refer to the unqualified type, "
3431 "so it is not used for linkage", TYPE_NAME (t));
3434 permerror (0, "%q+#D, declared using local type %qT, "
3435 "is used but never defined", decl, t);
3438 /* This routine is called at the end of compilation.
3439 Its job is to create all the code needed to initialize and
3440 destroy the global aggregates. We do the destruction
3441 first, since that way we only need to reverse the decls once. */
3444 cp_write_global_declarations (void)
3450 unsigned ssdf_count = 0;
3453 struct pointer_set_t *candidates;
3455 locus = input_location;
3458 /* Bad parse errors. Just forget about it. */
3459 if (! global_bindings_p () || current_class_type || decl_namespace_list)
3463 c_common_write_pch ();
3465 /* FIXME - huh? was input_line -= 1;*/
3467 /* We now have to write out all the stuff we put off writing out.
3470 o Template specializations that we have not yet instantiated,
3471 but which are needed.
3472 o Initialization and destruction for non-local objects with
3473 static storage duration. (Local objects with static storage
3474 duration are initialized when their scope is first entered,
3475 and are cleaned up via atexit.)
3476 o Virtual function tables.
3478 All of these may cause others to be needed. For example,
3479 instantiating one function may cause another to be needed, and
3480 generating the initializer for an object may cause templates to be
3481 instantiated, etc., etc. */
3483 timevar_push (TV_VARCONST);
3485 emit_support_tinfos ();
3494 /* If there are templates that we've put off instantiating, do
3496 instantiate_pending_templates (retries);
3499 /* Write out virtual tables as required. Note that writing out
3500 the virtual table for a template class may cause the
3501 instantiation of members of that class. If we write out
3502 vtables then we remove the class from our list so we don't
3503 have to look at it again. */
3505 while (keyed_classes != NULL_TREE
3506 && maybe_emit_vtables (TREE_VALUE (keyed_classes)))
3509 keyed_classes = TREE_CHAIN (keyed_classes);
3515 tree next = TREE_CHAIN (t);
3519 if (maybe_emit_vtables (TREE_VALUE (next)))
3522 TREE_CHAIN (t) = TREE_CHAIN (next);
3527 next = TREE_CHAIN (t);
3531 /* Write out needed type info variables. We have to be careful
3532 looping through unemitted decls, because emit_tinfo_decl may
3533 cause other variables to be needed. New elements will be
3534 appended, and we remove from the vector those that actually
3536 for (i = VEC_length (tree, unemitted_tinfo_decls);
3537 VEC_iterate (tree, unemitted_tinfo_decls, --i, t);)
3538 if (emit_tinfo_decl (t))
3541 VEC_unordered_remove (tree, unemitted_tinfo_decls, i);
3544 /* The list of objects with static storage duration is built up
3545 in reverse order. We clear STATIC_AGGREGATES so that any new
3546 aggregates added during the initialization of these will be
3547 initialized in the correct order when we next come around the
3549 vars = prune_vars_needing_no_initialization (&static_aggregates);
3553 /* We need to start a new initialization function each time
3554 through the loop. That's because we need to know which
3555 vtables have been referenced, and TREE_SYMBOL_REFERENCED
3556 isn't computed until a function is finished, and written
3557 out. That's a deficiency in the back end. When this is
3558 fixed, these initialization functions could all become
3559 inline, with resulting performance improvements. */
3562 /* Set the line and file, so that it is obviously not from
3564 input_location = locus;
3565 ssdf_body = start_static_storage_duration_function (ssdf_count);
3567 /* Make sure the back end knows about all the variables. */
3568 write_out_vars (vars);
3570 /* First generate code to do all the initializations. */
3572 do_static_initialization_or_destruction (vars, /*initp=*/true);
3574 /* Then, generate code to do all the destructions. Do these
3575 in reverse order so that the most recently constructed
3576 variable is the first destroyed. If we're using
3577 __cxa_atexit, then we don't need to do this; functions
3578 were registered at initialization time to destroy the
3580 if (!flag_use_cxa_atexit && vars)
3582 vars = nreverse (vars);
3583 do_static_initialization_or_destruction (vars, /*initp=*/false);
3588 /* Finish up the static storage duration function for this
3590 input_location = locus;
3591 finish_static_storage_duration_function (ssdf_body);
3593 /* All those initializations and finalizations might cause
3594 us to need more inline functions, more template
3595 instantiations, etc. */
3598 /* ??? was: locus.line++; */
3601 /* Go through the set of inline functions whose bodies have not
3602 been emitted yet. If out-of-line copies of these functions
3603 are required, emit them. */
3604 for (i = 0; VEC_iterate (tree, deferred_fns, i, decl); ++i)
3606 /* Does it need synthesizing? */
3607 if (DECL_DEFAULTED_FN (decl) && ! DECL_INITIAL (decl)
3608 && (! DECL_REALLY_EXTERN (decl) || possibly_inlined_p (decl)))
3610 /* Even though we're already at the top-level, we push
3611 there again. That way, when we pop back a few lines
3612 hence, all of our state is restored. Otherwise,
3613 finish_function doesn't clean things up, and we end
3614 up with CURRENT_FUNCTION_DECL set. */
3615 push_to_top_level ();
3616 /* The decl's location will mark where it was first
3617 needed. Save that so synthesize method can indicate
3618 where it was needed from, in case of error */
3619 input_location = DECL_SOURCE_LOCATION (decl);
3620 synthesize_method (decl);
3621 pop_from_top_level ();
3625 if (!DECL_SAVED_TREE (decl))
3628 /* We lie to the back end, pretending that some functions
3629 are not defined when they really are. This keeps these
3630 functions from being put out unnecessarily. But, we must
3631 stop lying when the functions are referenced, or if they
3632 are not comdat since they need to be put out now. If
3633 DECL_INTERFACE_KNOWN, then we have already set
3634 DECL_EXTERNAL appropriately, so there's no need to check
3635 again, and we do not want to clear DECL_EXTERNAL if a
3636 previous call to import_export_decl set it.
3638 This is done in a separate for cycle, because if some
3639 deferred function is contained in another deferred
3640 function later in deferred_fns varray,
3641 rest_of_compilation would skip this function and we
3642 really cannot expand the same function twice. */
3643 import_export_decl (decl);
3644 if (DECL_NOT_REALLY_EXTERN (decl)
3645 && DECL_INITIAL (decl)
3646 && decl_needed_p (decl))
3647 DECL_EXTERNAL (decl) = 0;
3649 /* If we're going to need to write this function out, and
3650 there's already a body for it, create RTL for it now.
3651 (There might be no body if this is a method we haven't
3652 gotten around to synthesizing yet.) */
3653 if (!DECL_EXTERNAL (decl)
3654 && decl_needed_p (decl)
3655 && !TREE_ASM_WRITTEN (decl)
3656 && !cgraph_node (decl)->local.finalized)
3658 /* We will output the function; no longer consider it in this
3660 DECL_DEFER_OUTPUT (decl) = 0;
3661 /* Generate RTL for this function now that we know we
3663 expand_or_defer_fn (decl);
3664 /* If we're compiling -fsyntax-only pretend that this
3665 function has been written out so that we don't try to
3667 if (flag_syntax_only)
3668 TREE_ASM_WRITTEN (decl) = 1;
3673 if (walk_namespaces (wrapup_globals_for_namespace, /*data=*/0))
3676 /* Static data members are just like namespace-scope globals. */
3677 for (i = 0; VEC_iterate (tree, pending_statics, i, decl); ++i)
3679 if (var_finalized_p (decl) || DECL_REALLY_EXTERN (decl)
3680 /* Don't write it out if we haven't seen a definition. */
3681 || DECL_IN_AGGR_P (decl))
3683 import_export_decl (decl);
3684 /* If this static data member is needed, provide it to the
3686 if (DECL_NOT_REALLY_EXTERN (decl) && decl_needed_p (decl))
3687 DECL_EXTERNAL (decl) = 0;
3689 if (VEC_length (tree, pending_statics) != 0
3690 && wrapup_global_declarations (VEC_address (tree, pending_statics),
3691 VEC_length (tree, pending_statics)))
3698 /* All used inline functions must have a definition at this point. */
3699 for (i = 0; VEC_iterate (tree, deferred_fns, i, decl); ++i)
3701 if (/* Check online inline functions that were actually used. */
3702 DECL_ODR_USED (decl) && DECL_DECLARED_INLINE_P (decl)
3703 /* If the definition actually was available here, then the
3704 fact that the function was not defined merely represents
3705 that for some reason (use of a template repository,
3706 #pragma interface, etc.) we decided not to emit the
3708 && !DECL_INITIAL (decl)
3709 /* An explicit instantiation can be used to specify
3710 that the body is in another unit. It will have
3711 already verified there was a definition. */
3712 && !DECL_EXPLICIT_INSTANTIATION (decl))
3714 warning (0, "inline function %q+D used but never defined", decl);
3715 /* Avoid a duplicate warning from check_global_declaration_1. */
3716 TREE_NO_WARNING (decl) = 1;
3720 /* So must decls that use a type with no linkage. */
3721 for (i = 0; VEC_iterate (tree, no_linkage_decls, i, decl); ++i)
3722 if (!decl_defined_p (decl))
3723 no_linkage_error (decl);
3725 /* We give C linkage to static constructors and destructors. */
3726 push_lang_context (lang_name_c);
3728 /* Generate initialization and destruction functions for all
3729 priorities for which they are required. */
3730 if (priority_info_map)
3731 splay_tree_foreach (priority_info_map,
3732 generate_ctor_and_dtor_functions_for_priority,
3734 else if (c_dialect_objc () && objc_static_init_needed_p ())
3735 /* If this is obj-c++ and we need a static init, call
3736 generate_ctor_or_dtor_function. */
3737 generate_ctor_or_dtor_function (/*constructor_p=*/true,
3738 DEFAULT_INIT_PRIORITY, &locus);
3740 /* We're done with the splay-tree now. */
3741 if (priority_info_map)
3742 splay_tree_delete (priority_info_map);
3744 /* Generate any missing aliases. */
3745 maybe_apply_pending_pragma_weaks ();
3747 /* We're done with static constructors, so we can go back to "C++"
3749 pop_lang_context ();
3751 /* Collect candidates for Java hidden aliases. */
3752 candidates = collect_candidates_for_java_method_aliases ();
3754 cgraph_finalize_compilation_unit ();
3756 /* Now, issue warnings about static, but not defined, functions,
3757 etc., and emit debugging information. */
3758 walk_namespaces (wrapup_globals_for_namespace, /*data=*/&reconsider);
3759 if (VEC_length (tree, pending_statics) != 0)
3761 check_global_declarations (VEC_address (tree, pending_statics),
3762 VEC_length (tree, pending_statics));
3763 emit_debug_global_declarations (VEC_address (tree, pending_statics),
3764 VEC_length (tree, pending_statics));
3767 /* Generate hidden aliases for Java. */
3770 build_java_method_aliases (candidates);
3771 pointer_set_destroy (candidates);
3776 /* The entire file is now complete. If requested, dump everything
3780 FILE *stream = dump_begin (TDI_tu, &flags);
3784 dump_node (global_namespace, flags & ~TDF_SLIM, stream);
3785 dump_end (TDI_tu, stream);
3789 timevar_pop (TV_VARCONST);
3791 if (flag_detailed_statistics)
3793 dump_tree_statistics ();
3794 dump_time_statistics ();
3796 input_location = locus;
3798 #ifdef ENABLE_CHECKING
3799 validate_conversion_obstack ();
3800 #endif /* ENABLE_CHECKING */
3803 /* FN is an OFFSET_REF, DOTSTAR_EXPR or MEMBER_REF indicating the
3804 function to call in parse-tree form; it has not yet been
3805 semantically analyzed. ARGS are the arguments to the function.
3806 They have already been semantically analyzed. This may change
3810 build_offset_ref_call_from_tree (tree fn, VEC(tree,gc) **args)
3813 VEC(tree,gc) *orig_args = NULL;
3818 object = TREE_OPERAND (fn, 0);
3820 if (processing_template_decl)
3822 gcc_assert (TREE_CODE (fn) == DOTSTAR_EXPR
3823 || TREE_CODE (fn) == MEMBER_REF);
3824 if (type_dependent_expression_p (fn)
3825 || any_type_dependent_arguments_p (*args))
3826 return build_nt_call_vec (fn, *args);
3828 orig_args = make_tree_vector_copy (*args);
3830 /* Transform the arguments and add the implicit "this"
3831 parameter. That must be done before the FN is transformed
3832 because we depend on the form of FN. */
3833 make_args_non_dependent (*args);
3834 object = build_non_dependent_expr (object);
3835 if (TREE_CODE (fn) == DOTSTAR_EXPR)
3836 object = cp_build_unary_op (ADDR_EXPR, object, 0, tf_warning_or_error);
3837 VEC_safe_insert (tree, gc, *args, 0, object);
3838 /* Now that the arguments are done, transform FN. */
3839 fn = build_non_dependent_expr (fn);
3842 /* A qualified name corresponding to a bound pointer-to-member is
3843 represented as an OFFSET_REF:
3845 struct B { void g(); };
3847 void B::g() { (this->*p)(); } */
3848 if (TREE_CODE (fn) == OFFSET_REF)
3850 tree object_addr = cp_build_unary_op (ADDR_EXPR, object, 0,
3851 tf_warning_or_error);
3852 fn = TREE_OPERAND (fn, 1);
3853 fn = get_member_function_from_ptrfunc (&object_addr, fn);
3854 VEC_safe_insert (tree, gc, *args, 0, object_addr);
3857 expr = cp_build_function_call_vec (fn, args, tf_warning_or_error);
3858 if (processing_template_decl && expr != error_mark_node)
3859 expr = build_min_non_dep_call_vec (expr, orig_fn, orig_args);
3861 if (orig_args != NULL)
3862 release_tree_vector (orig_args);
3869 check_default_args (tree x)
3871 tree arg = TYPE_ARG_TYPES (TREE_TYPE (x));
3872 bool saw_def = false;
3873 int i = 0 - (TREE_CODE (TREE_TYPE (x)) == METHOD_TYPE);
3874 for (; arg && arg != void_list_node; arg = TREE_CHAIN (arg), ++i)
3876 if (TREE_PURPOSE (arg))
3880 error ("default argument missing for parameter %P of %q+#D", i, x);
3881 TREE_PURPOSE (arg) = error_mark_node;
3886 /* Return true if function DECL can be inlined. This is used to force
3887 instantiation of methods that might be interesting for inlining. */
3889 possibly_inlined_p (tree decl)
3891 gcc_assert (TREE_CODE (decl) == FUNCTION_DECL);
3892 if (DECL_UNINLINABLE (decl))
3894 if (!optimize || pragma_java_exceptions)
3895 return DECL_DECLARED_INLINE_P (decl);
3896 /* When optimizing, we might inline everything when flatten
3897 attribute or heuristics inlining for size or autoinlining
3902 /* Mark DECL (either a _DECL or a BASELINK) as "used" in the program.
3903 If DECL is a specialization or implicitly declared class member,
3904 generate the actual definition. */
3907 mark_used (tree decl)
3909 HOST_WIDE_INT saved_processing_template_decl = 0;
3911 /* If DECL is a BASELINK for a single function, then treat it just
3912 like the DECL for the function. Otherwise, if the BASELINK is
3913 for an overloaded function, we don't know which function was
3914 actually used until after overload resolution. */
3915 if (TREE_CODE (decl) == BASELINK)
3917 decl = BASELINK_FUNCTIONS (decl);
3918 if (really_overloaded_fn (decl))
3920 decl = OVL_CURRENT (decl);
3923 /* Set TREE_USED for the benefit of -Wunused. */
3924 TREE_USED (decl) = 1;
3925 if (DECL_CLONED_FUNCTION_P (decl))
3926 TREE_USED (DECL_CLONED_FUNCTION (decl)) = 1;
3928 if (TREE_CODE (decl) == FUNCTION_DECL
3929 && DECL_DELETED_FN (decl))
3931 error ("deleted function %q+D", decl);
3932 error ("used here");
3935 /* If we don't need a value, then we don't need to synthesize DECL. */
3936 if (cp_unevaluated_operand != 0)
3939 /* We can only check DECL_ODR_USED on variables or functions with
3940 DECL_LANG_SPECIFIC set, and these are also the only decls that we
3941 might need special handling for. */
3942 if ((TREE_CODE (decl) != VAR_DECL && TREE_CODE (decl) != FUNCTION_DECL)
3943 || DECL_LANG_SPECIFIC (decl) == NULL
3944 || DECL_THUNK_P (decl))
3947 /* We only want to do this processing once. We don't need to keep trying
3948 to instantiate inline templates, because unit-at-a-time will make sure
3949 we get them compiled before functions that want to inline them. */
3950 if (DECL_ODR_USED (decl))
3953 /* If within finish_function, defer the rest until that function
3954 finishes, otherwise it might recurse. */
3955 if (defer_mark_used_calls)
3957 VEC_safe_push (tree, gc, deferred_mark_used_calls, decl);
3961 /* Normally, we can wait until instantiation-time to synthesize
3962 DECL. However, if DECL is a static data member initialized with
3963 a constant, we need the value right now because a reference to
3964 such a data member is not value-dependent. */
3965 if (TREE_CODE (decl) == VAR_DECL
3966 && DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl)
3967 && DECL_CLASS_SCOPE_P (decl))
3969 /* Don't try to instantiate members of dependent types. We
3970 cannot just use dependent_type_p here because this function
3971 may be called from fold_non_dependent_expr, and then we may
3972 see dependent types, even though processing_template_decl
3974 if (CLASSTYPE_TEMPLATE_INFO ((DECL_CONTEXT (decl)))
3975 && uses_template_parms (CLASSTYPE_TI_ARGS (DECL_CONTEXT (decl))))
3977 /* Pretend that we are not in a template, even if we are, so
3978 that the static data member initializer will be processed. */
3979 saved_processing_template_decl = processing_template_decl;
3980 processing_template_decl = 0;
3983 if (processing_template_decl)
3986 DECL_ODR_USED (decl) = 1;
3987 if (DECL_CLONED_FUNCTION_P (decl))
3988 DECL_ODR_USED (DECL_CLONED_FUNCTION (decl)) = 1;
3990 /* DR 757: A type without linkage shall not be used as the type of a
3991 variable or function with linkage, unless
3992 o the variable or function has extern "C" linkage (7.5 [dcl.link]), or
3993 o the variable or function is not used (3.2 [basic.def.odr]) or is
3994 defined in the same translation unit. */
3995 if (decl_linkage (decl) != lk_none
3996 && !DECL_EXTERN_C_P (decl)
3997 && !DECL_ARTIFICIAL (decl)
3998 && !decl_defined_p (decl)
3999 && no_linkage_check (TREE_TYPE (decl), /*relaxed_p=*/false))
4001 if (is_local_extern (decl))
4002 /* There's no way to define a local extern, and adding it to
4003 the vector interferes with GC, so give an error now. */
4004 no_linkage_error (decl);
4006 VEC_safe_push (tree, gc, no_linkage_decls, decl);
4009 if (TREE_CODE (decl) == FUNCTION_DECL && DECL_DECLARED_INLINE_P (decl)
4010 && !DECL_INITIAL (decl) && !DECL_ARTIFICIAL (decl))
4011 /* Remember it, so we can check it was defined. */
4012 note_vague_linkage_fn (decl);
4014 /* Is it a synthesized method that needs to be synthesized? */
4015 if (TREE_CODE (decl) == FUNCTION_DECL
4016 && DECL_NONSTATIC_MEMBER_FUNCTION_P (decl)
4017 && DECL_DEFAULTED_FN (decl)
4018 && ! DECL_INITIAL (decl))
4020 /* Remember the current location for a function we will end up
4021 synthesizing. Then we can inform the user where it was
4022 required in the case of error. */
4023 DECL_SOURCE_LOCATION (decl) = input_location;
4025 /* Synthesizing an implicitly defined member function will result in
4026 garbage collection. We must treat this situation as if we were
4027 within the body of a function so as to avoid collecting live data
4028 on the stack (such as overload resolution candidates).
4030 We could just let cp_write_global_declarations handle synthesizing
4031 this function, since we just added it to deferred_fns, but doing
4032 it at the use site produces better error messages. */
4034 synthesize_method (decl);
4036 /* If this is a synthesized method we don't need to
4037 do the instantiation test below. */
4039 else if ((TREE_CODE (decl) == FUNCTION_DECL || TREE_CODE (decl) == VAR_DECL)
4040 && DECL_TEMPLATE_INFO (decl)
4041 && (!DECL_EXPLICIT_INSTANTIATION (decl)
4042 || always_instantiate_p (decl)))
4043 /* If this is a function or variable that is an instance of some
4044 template, we now know that we will need to actually do the
4045 instantiation. We check that DECL is not an explicit
4046 instantiation because that is not checked in instantiate_decl.
4048 We put off instantiating functions in order to improve compile
4049 times. Maintaining a stack of active functions is expensive,
4050 and the inliner knows to instantiate any functions it might
4051 need. Therefore, we always try to defer instantiation. */
4052 instantiate_decl (decl, /*defer_ok=*/true,
4053 /*expl_inst_class_mem_p=*/false);
4055 processing_template_decl = saved_processing_template_decl;
4058 #include "gt-cp-decl2.h"