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)
120 if (fntype == error_mark_node || ctype == error_mark_node)
121 return error_mark_node;
123 gcc_assert (TREE_CODE (fntype) == FUNCTION_TYPE
124 || TREE_CODE (fntype) == METHOD_TYPE);
126 type_quals = quals & ~TYPE_QUAL_RESTRICT;
127 ctype = cp_build_qualified_type (ctype, type_quals);
128 raises = TYPE_RAISES_EXCEPTIONS (fntype);
129 attrs = TYPE_ATTRIBUTES (fntype);
130 fntype = build_method_type_directly (ctype, TREE_TYPE (fntype),
131 (TREE_CODE (fntype) == METHOD_TYPE
132 ? TREE_CHAIN (TYPE_ARG_TYPES (fntype))
133 : TYPE_ARG_TYPES (fntype)));
135 fntype = build_exception_variant (fntype, raises);
137 fntype = cp_build_type_attribute_variant (fntype, attrs);
142 /* Return a variant of FNTYPE, a FUNCTION_TYPE or METHOD_TYPE, with its
143 return type changed to NEW_RET. */
146 change_return_type (tree new_ret, tree fntype)
149 tree args = TYPE_ARG_TYPES (fntype);
150 tree raises = TYPE_RAISES_EXCEPTIONS (fntype);
151 tree attrs = TYPE_ATTRIBUTES (fntype);
153 if (same_type_p (new_ret, TREE_TYPE (fntype)))
156 if (TREE_CODE (fntype) == FUNCTION_TYPE)
157 newtype = build_function_type (new_ret, args);
159 newtype = build_method_type_directly (TYPE_METHOD_BASETYPE (fntype),
160 new_ret, TREE_CHAIN (args));
162 newtype = build_exception_variant (newtype, raises);
164 newtype = cp_build_type_attribute_variant (newtype, attrs);
169 /* Build a PARM_DECL with NAME and TYPE, and set DECL_ARG_TYPE
173 cp_build_parm_decl (tree name, tree type)
175 tree parm = build_decl (input_location,
176 PARM_DECL, name, type);
177 /* DECL_ARG_TYPE is only used by the back end and the back end never
179 if (!processing_template_decl)
180 DECL_ARG_TYPE (parm) = type_passed_as (type);
182 /* If the type is a pack expansion, then we have a function
184 if (type && TREE_CODE (type) == TYPE_PACK_EXPANSION)
185 FUNCTION_PARAMETER_PACK_P (parm) = 1;
190 /* Returns a PARM_DECL for a parameter of the indicated TYPE, with the
194 build_artificial_parm (tree name, tree type)
196 tree parm = cp_build_parm_decl (name, type);
197 DECL_ARTIFICIAL (parm) = 1;
198 /* All our artificial parms are implicitly `const'; they cannot be
200 TREE_READONLY (parm) = 1;
204 /* Constructors for types with virtual baseclasses need an "in-charge" flag
205 saying whether this constructor is responsible for initialization of
206 virtual baseclasses or not. All destructors also need this "in-charge"
207 flag, which additionally determines whether or not the destructor should
208 free the memory for the object.
210 This function adds the "in-charge" flag to member function FN if
211 appropriate. It is called from grokclassfn and tsubst.
212 FN must be either a constructor or destructor.
214 The in-charge flag follows the 'this' parameter, and is followed by the
215 VTT parm (if any), then the user-written parms. */
218 maybe_retrofit_in_chrg (tree fn)
220 tree basetype, arg_types, parms, parm, fntype;
222 /* If we've already add the in-charge parameter don't do it again. */
223 if (DECL_HAS_IN_CHARGE_PARM_P (fn))
226 /* When processing templates we can't know, in general, whether or
227 not we're going to have virtual baseclasses. */
228 if (processing_template_decl)
231 /* We don't need an in-charge parameter for constructors that don't
232 have virtual bases. */
233 if (DECL_CONSTRUCTOR_P (fn)
234 && !CLASSTYPE_VBASECLASSES (DECL_CONTEXT (fn)))
237 arg_types = TYPE_ARG_TYPES (TREE_TYPE (fn));
238 basetype = TREE_TYPE (TREE_VALUE (arg_types));
239 arg_types = TREE_CHAIN (arg_types);
241 parms = TREE_CHAIN (DECL_ARGUMENTS (fn));
243 /* If this is a subobject constructor or destructor, our caller will
244 pass us a pointer to our VTT. */
245 if (CLASSTYPE_VBASECLASSES (DECL_CONTEXT (fn)))
247 parm = build_artificial_parm (vtt_parm_identifier, vtt_parm_type);
249 /* First add it to DECL_ARGUMENTS between 'this' and the real args... */
250 TREE_CHAIN (parm) = parms;
253 /* ...and then to TYPE_ARG_TYPES. */
254 arg_types = hash_tree_chain (vtt_parm_type, arg_types);
256 DECL_HAS_VTT_PARM_P (fn) = 1;
259 /* Then add the in-charge parm (before the VTT parm). */
260 parm = build_artificial_parm (in_charge_identifier, integer_type_node);
261 TREE_CHAIN (parm) = parms;
263 arg_types = hash_tree_chain (integer_type_node, arg_types);
265 /* Insert our new parameter(s) into the list. */
266 TREE_CHAIN (DECL_ARGUMENTS (fn)) = parms;
268 /* And rebuild the function type. */
269 fntype = build_method_type_directly (basetype, TREE_TYPE (TREE_TYPE (fn)),
271 if (TYPE_RAISES_EXCEPTIONS (TREE_TYPE (fn)))
272 fntype = build_exception_variant (fntype,
273 TYPE_RAISES_EXCEPTIONS (TREE_TYPE (fn)));
274 if (TYPE_ATTRIBUTES (TREE_TYPE (fn)))
275 fntype = (cp_build_type_attribute_variant
276 (fntype, TYPE_ATTRIBUTES (TREE_TYPE (fn))));
277 TREE_TYPE (fn) = fntype;
279 /* Now we've got the in-charge parameter. */
280 DECL_HAS_IN_CHARGE_PARM_P (fn) = 1;
283 /* Classes overload their constituent function names automatically.
284 When a function name is declared in a record structure,
285 its name is changed to it overloaded name. Since names for
286 constructors and destructors can conflict, we place a leading
289 CNAME is the name of the class we are grokking for.
291 FUNCTION is a FUNCTION_DECL. It was created by `grokdeclarator'.
293 FLAGS contains bits saying what's special about today's
294 arguments. DTOR_FLAG == DESTRUCTOR.
296 If FUNCTION is a destructor, then we must add the `auto-delete' field
297 as a second parameter. There is some hair associated with the fact
298 that we must "declare" this variable in the manner consistent with the
299 way the rest of the arguments were declared.
301 QUALS are the qualifiers for the this pointer. */
304 grokclassfn (tree ctype, tree function, enum overload_flags flags)
306 tree fn_name = DECL_NAME (function);
308 /* Even within an `extern "C"' block, members get C++ linkage. See
309 [dcl.link] for details. */
310 SET_DECL_LANGUAGE (function, lang_cplusplus);
312 if (fn_name == NULL_TREE)
314 error ("name missing for member function");
315 fn_name = get_identifier ("<anonymous>");
316 DECL_NAME (function) = fn_name;
319 DECL_CONTEXT (function) = ctype;
321 if (flags == DTOR_FLAG)
322 DECL_DESTRUCTOR_P (function) = 1;
324 if (flags == DTOR_FLAG || DECL_CONSTRUCTOR_P (function))
325 maybe_retrofit_in_chrg (function);
328 /* Create an ARRAY_REF, checking for the user doing things backwards
332 grok_array_decl (tree array_expr, tree index_exp)
336 tree orig_array_expr = array_expr;
337 tree orig_index_exp = index_exp;
339 if (error_operand_p (array_expr) || error_operand_p (index_exp))
340 return error_mark_node;
342 if (processing_template_decl)
344 if (type_dependent_expression_p (array_expr)
345 || type_dependent_expression_p (index_exp))
346 return build_min_nt (ARRAY_REF, array_expr, index_exp,
347 NULL_TREE, NULL_TREE);
348 array_expr = build_non_dependent_expr (array_expr);
349 index_exp = build_non_dependent_expr (index_exp);
352 type = TREE_TYPE (array_expr);
354 type = non_reference (type);
356 /* If they have an `operator[]', use that. */
357 if (MAYBE_CLASS_TYPE_P (type) || MAYBE_CLASS_TYPE_P (TREE_TYPE (index_exp)))
358 expr = build_new_op (ARRAY_REF, LOOKUP_NORMAL,
359 array_expr, index_exp, NULL_TREE,
360 /*overloaded_p=*/NULL, tf_warning_or_error);
365 /* Otherwise, create an ARRAY_REF for a pointer or array type.
366 It is a little-known fact that, if `a' is an array and `i' is
367 an int, you can write `i[a]', which means the same thing as
369 if (TREE_CODE (type) == ARRAY_TYPE)
372 p1 = build_expr_type_conversion (WANT_POINTER, array_expr, false);
374 if (TREE_CODE (TREE_TYPE (index_exp)) == ARRAY_TYPE)
377 p2 = build_expr_type_conversion (WANT_POINTER, index_exp, false);
379 i1 = build_expr_type_conversion (WANT_INT | WANT_ENUM, array_expr,
381 i2 = build_expr_type_conversion (WANT_INT | WANT_ENUM, index_exp,
384 if ((p1 && i2) && (i1 && p2))
385 error ("ambiguous conversion for array subscript");
388 array_expr = p1, index_exp = i2;
390 array_expr = p2, index_exp = i1;
393 error ("invalid types %<%T[%T]%> for array subscript",
394 type, TREE_TYPE (index_exp));
395 return error_mark_node;
398 if (array_expr == error_mark_node || index_exp == error_mark_node)
399 error ("ambiguous conversion for array subscript");
401 expr = build_array_ref (input_location, array_expr, index_exp);
403 if (processing_template_decl && expr != error_mark_node)
404 return build_min_non_dep (ARRAY_REF, expr, orig_array_expr, orig_index_exp,
405 NULL_TREE, NULL_TREE);
409 /* Given the cast expression EXP, checking out its validity. Either return
410 an error_mark_node if there was an unavoidable error, return a cast to
411 void for trying to delete a pointer w/ the value 0, or return the
412 call to delete. If DOING_VEC is true, we handle things differently
413 for doing an array delete.
414 Implements ARM $5.3.4. This is called from the parser. */
417 delete_sanity (tree exp, tree size, bool doing_vec, int use_global_delete)
421 if (exp == error_mark_node)
424 if (processing_template_decl)
426 t = build_min (DELETE_EXPR, void_type_node, exp, size);
427 DELETE_EXPR_USE_GLOBAL (t) = use_global_delete;
428 DELETE_EXPR_USE_VEC (t) = doing_vec;
429 TREE_SIDE_EFFECTS (t) = 1;
433 /* An array can't have been allocated by new, so complain. */
434 if (TREE_CODE (exp) == VAR_DECL
435 && TREE_CODE (TREE_TYPE (exp)) == ARRAY_TYPE)
436 warning (0, "deleting array %q#D", exp);
438 t = build_expr_type_conversion (WANT_POINTER, exp, true);
440 if (t == NULL_TREE || t == error_mark_node)
442 error ("type %q#T argument given to %<delete%>, expected pointer",
444 return error_mark_node;
447 type = TREE_TYPE (t);
449 /* As of Valley Forge, you can delete a pointer to const. */
451 /* You can't delete functions. */
452 if (TREE_CODE (TREE_TYPE (type)) == FUNCTION_TYPE)
454 error ("cannot delete a function. Only pointer-to-objects are "
455 "valid arguments to %<delete%>");
456 return error_mark_node;
459 /* Deleting ptr to void is undefined behavior [expr.delete/3]. */
460 if (TREE_CODE (TREE_TYPE (type)) == VOID_TYPE)
462 warning (0, "deleting %qT is undefined", type);
466 /* Deleting a pointer with the value zero is valid and has no effect. */
467 if (integer_zerop (t))
468 return build1 (NOP_EXPR, void_type_node, t);
471 return build_vec_delete (t, /*maxindex=*/NULL_TREE,
472 sfk_deleting_destructor,
475 return build_delete (type, t, sfk_deleting_destructor,
476 LOOKUP_NORMAL, use_global_delete);
479 /* Report an error if the indicated template declaration is not the
480 sort of thing that should be a member template. */
483 check_member_template (tree tmpl)
487 gcc_assert (TREE_CODE (tmpl) == TEMPLATE_DECL);
488 decl = DECL_TEMPLATE_RESULT (tmpl);
490 if (TREE_CODE (decl) == FUNCTION_DECL
491 || (TREE_CODE (decl) == TYPE_DECL
492 && MAYBE_CLASS_TYPE_P (TREE_TYPE (decl))))
494 /* The parser rejects template declarations in local classes. */
495 gcc_assert (!current_function_decl);
496 /* The parser rejects any use of virtual in a function template. */
497 gcc_assert (!(TREE_CODE (decl) == FUNCTION_DECL
498 && DECL_VIRTUAL_P (decl)));
500 /* The debug-information generating code doesn't know what to do
501 with member templates. */
502 DECL_IGNORED_P (tmpl) = 1;
505 error ("template declaration of %q#D", decl);
508 /* Return true iff TYPE is a valid Java parameter or return type. */
511 acceptable_java_type (tree type)
513 if (type == error_mark_node)
516 if (TREE_CODE (type) == VOID_TYPE || TYPE_FOR_JAVA (type))
518 if (TREE_CODE (type) == POINTER_TYPE || TREE_CODE (type) == REFERENCE_TYPE)
520 type = TREE_TYPE (type);
521 if (TREE_CODE (type) == RECORD_TYPE)
524 if (! TYPE_FOR_JAVA (type))
526 if (! CLASSTYPE_TEMPLATE_INFO (type))
528 args = CLASSTYPE_TI_ARGS (type);
529 i = TREE_VEC_LENGTH (args);
532 type = TREE_VEC_ELT (args, i);
533 if (TREE_CODE (type) == POINTER_TYPE)
534 type = TREE_TYPE (type);
535 if (! TYPE_FOR_JAVA (type))
544 /* For a METHOD in a Java class CTYPE, return true if
545 the parameter and return types are valid Java types.
546 Otherwise, print appropriate error messages, and return false. */
549 check_java_method (tree method)
552 tree arg_types = TYPE_ARG_TYPES (TREE_TYPE (method));
553 tree ret_type = TREE_TYPE (TREE_TYPE (method));
555 if (!acceptable_java_type (ret_type))
557 error ("Java method %qD has non-Java return type %qT",
562 arg_types = TREE_CHAIN (arg_types);
563 if (DECL_HAS_IN_CHARGE_PARM_P (method))
564 arg_types = TREE_CHAIN (arg_types);
565 if (DECL_HAS_VTT_PARM_P (method))
566 arg_types = TREE_CHAIN (arg_types);
568 for (; arg_types != NULL_TREE; arg_types = TREE_CHAIN (arg_types))
570 tree type = TREE_VALUE (arg_types);
571 if (!acceptable_java_type (type))
573 if (type != error_mark_node)
574 error ("Java method %qD has non-Java parameter type %qT",
582 /* Sanity check: report error if this function FUNCTION is not
583 really a member of the class (CTYPE) it is supposed to belong to.
584 TEMPLATE_PARMS is used to specify the template parameters of a member
585 template passed as FUNCTION_DECL. If the member template is passed as a
586 TEMPLATE_DECL, it can be NULL since the parameters can be extracted
587 from the declaration. If the function is not a function template, it
589 It returns the original declaration for the function, NULL_TREE if
590 no declaration was found, error_mark_node if an error was emitted. */
593 check_classfn (tree ctype, tree function, tree template_parms)
599 if (DECL_USE_TEMPLATE (function)
600 && !(TREE_CODE (function) == TEMPLATE_DECL
601 && DECL_TEMPLATE_SPECIALIZATION (function))
602 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (function)))
603 /* Since this is a specialization of a member template,
604 we're not going to find the declaration in the class.
607 struct S { template <typename T> void f(T); };
608 template <> void S::f(int);
610 we're not going to find `S::f(int)', but there's no
611 reason we should, either. We let our callers know we didn't
612 find the method, but we don't complain. */
615 /* Basic sanity check: for a template function, the template parameters
616 either were not passed, or they are the same of DECL_TEMPLATE_PARMS. */
617 if (TREE_CODE (function) == TEMPLATE_DECL)
620 && !comp_template_parms (template_parms,
621 DECL_TEMPLATE_PARMS (function)))
623 error ("template parameter lists provided don't match the "
624 "template parameters of %qD", function);
625 return error_mark_node;
627 template_parms = DECL_TEMPLATE_PARMS (function);
630 /* OK, is this a definition of a member template? */
631 is_template = (template_parms != NULL_TREE);
633 /* We must enter the scope here, because conversion operators are
634 named by target type, and type equivalence relies on typenames
635 resolving within the scope of CTYPE. */
636 pushed_scope = push_scope (ctype);
637 ix = class_method_index_for_fn (complete_type (ctype), function);
640 VEC(tree,gc) *methods = CLASSTYPE_METHOD_VEC (ctype);
641 tree fndecls, fndecl = 0;
643 const char *format = NULL;
645 for (fndecls = VEC_index (tree, methods, ix);
646 fndecls; fndecls = OVL_NEXT (fndecls))
650 fndecl = OVL_CURRENT (fndecls);
651 p1 = TYPE_ARG_TYPES (TREE_TYPE (function));
652 p2 = TYPE_ARG_TYPES (TREE_TYPE (fndecl));
654 /* We cannot simply call decls_match because this doesn't
655 work for static member functions that are pretending to
656 be methods, and because the name may have been changed by
659 /* Get rid of the this parameter on functions that become
661 if (DECL_STATIC_FUNCTION_P (fndecl)
662 && TREE_CODE (TREE_TYPE (function)) == METHOD_TYPE)
663 p1 = TREE_CHAIN (p1);
665 /* A member template definition only matches a member template
667 if (is_template != (TREE_CODE (fndecl) == TEMPLATE_DECL))
670 if (same_type_p (TREE_TYPE (TREE_TYPE (function)),
671 TREE_TYPE (TREE_TYPE (fndecl)))
672 && compparms (p1, p2)
674 || comp_template_parms (template_parms,
675 DECL_TEMPLATE_PARMS (fndecl)))
676 && (DECL_TEMPLATE_SPECIALIZATION (function)
677 == DECL_TEMPLATE_SPECIALIZATION (fndecl))
678 && (!DECL_TEMPLATE_SPECIALIZATION (function)
679 || (DECL_TI_TEMPLATE (function)
680 == DECL_TI_TEMPLATE (fndecl))))
686 pop_scope (pushed_scope);
687 return OVL_CURRENT (fndecls);
690 error_at (DECL_SOURCE_LOCATION (function),
691 "prototype for %q#D does not match any in class %qT",
693 is_conv_op = DECL_CONV_FN_P (fndecl);
696 ix = CLASSTYPE_FIRST_CONVERSION_SLOT;
697 fndecls = VEC_index (tree, methods, ix);
700 fndecl = OVL_CURRENT (fndecls);
701 fndecls = OVL_NEXT (fndecls);
703 if (!fndecls && is_conv_op)
705 if (VEC_length (tree, methods) > (size_t) ++ix)
707 fndecls = VEC_index (tree, methods, ix);
708 if (!DECL_CONV_FN_P (OVL_CURRENT (fndecls)))
720 format = N_("candidates are: %+#D");
722 format = N_("candidate is: %+#D");
723 error (format, fndecl);
726 else if (!COMPLETE_TYPE_P (ctype))
727 cxx_incomplete_type_error (function, ctype);
729 error ("no %q#D member function declared in class %qT",
733 pop_scope (pushed_scope);
734 return error_mark_node;
737 /* DECL is a function with vague linkage. Remember it so that at the
738 end of the translation unit we can decide whether or not to emit
742 note_vague_linkage_fn (tree decl)
744 DECL_DEFER_OUTPUT (decl) = 1;
745 VEC_safe_push (tree, gc, deferred_fns, decl);
748 /* We have just processed the DECL, which is a static data member.
749 The other parameters are as for cp_finish_decl. */
752 finish_static_data_member_decl (tree decl,
753 tree init, bool init_const_expr_p,
757 DECL_CONTEXT (decl) = current_class_type;
759 /* We cannot call pushdecl here, because that would fill in the
760 TREE_CHAIN of our decl. Instead, we modify cp_finish_decl to do
761 the right thing, namely, to put this decl out straight away. */
763 if (! processing_template_decl)
764 VEC_safe_push (tree, gc, pending_statics, decl);
766 if (LOCAL_CLASS_P (current_class_type))
767 permerror (input_location, "local class %q#T shall not have static data member %q#D",
768 current_class_type, decl);
770 /* Static consts need not be initialized in the class definition. */
771 if (init != NULL_TREE && TYPE_NEEDS_CONSTRUCTING (TREE_TYPE (decl)))
773 static int explained = 0;
775 error ("initializer invalid for static member with constructor");
778 error ("(an out of class initialization is required)");
784 DECL_INITIAL (decl) = init;
785 DECL_IN_AGGR_P (decl) = 1;
787 cp_finish_decl (decl, init, init_const_expr_p, asmspec_tree, flags);
790 /* DECLARATOR and DECLSPECS correspond to a class member. The other
791 parameters are as for cp_finish_decl. Return the DECL for the
792 class member declared. */
795 grokfield (const cp_declarator *declarator,
796 cp_decl_specifier_seq *declspecs,
797 tree init, bool init_const_expr_p,
802 const char *asmspec = 0;
803 int flags = LOOKUP_ONLYCONVERTING;
807 && TREE_CODE (init) == TREE_LIST
808 && TREE_VALUE (init) == error_mark_node
809 && TREE_CHAIN (init) == NULL_TREE)
812 value = grokdeclarator (declarator, declspecs, FIELD, init != 0, &attrlist);
813 if (! value || error_operand_p (value))
814 /* friend or constructor went bad. */
815 return error_mark_node;
817 if (TREE_CODE (value) == TYPE_DECL && init)
819 error ("typedef %qD is initialized (use decltype instead)", value);
823 /* Pass friendly classes back. */
824 if (value == void_type_node)
827 /* Pass friend decls back. */
828 if ((TREE_CODE (value) == FUNCTION_DECL
829 || TREE_CODE (value) == TEMPLATE_DECL)
830 && DECL_CONTEXT (value) != current_class_type)
833 name = DECL_NAME (value);
835 if (name != NULL_TREE)
837 if (TREE_CODE (name) == TEMPLATE_ID_EXPR)
839 error ("explicit template argument list not allowed");
840 return error_mark_node;
843 if (IDENTIFIER_POINTER (name)[0] == '_'
844 && ! strcmp (IDENTIFIER_POINTER (name), "_vptr"))
845 error ("member %qD conflicts with virtual function table field name",
849 /* Stash away type declarations. */
850 if (TREE_CODE (value) == TYPE_DECL)
852 DECL_NONLOCAL (value) = 1;
853 DECL_CONTEXT (value) = current_class_type;
855 if (processing_template_decl)
856 value = push_template_decl (value);
862 /* If this is a typedef that names the class for linkage purposes
863 (7.1.3p8), apply any attributes directly to the type. */
864 if (TAGGED_TYPE_P (TREE_TYPE (value))
865 && value == TYPE_NAME (TYPE_MAIN_VARIANT (TREE_TYPE (value))))
866 attrflags = ATTR_FLAG_TYPE_IN_PLACE;
868 cplus_decl_attributes (&value, attrlist, attrflags);
871 if (declspecs->specs[(int)ds_typedef]
872 && TREE_TYPE (value) != error_mark_node
873 && TYPE_NAME (TYPE_MAIN_VARIANT (TREE_TYPE (value))) != value)
874 cp_set_underlying_type (value);
879 if (DECL_IN_AGGR_P (value))
881 error ("%qD is already defined in %qT", value, DECL_CONTEXT (value));
882 return void_type_node;
885 if (asmspec_tree && asmspec_tree != error_mark_node)
886 asmspec = TREE_STRING_POINTER (asmspec_tree);
890 if (TREE_CODE (value) == FUNCTION_DECL)
892 /* Initializers for functions are rejected early in the parser.
893 If we get here, it must be a pure specifier for a method. */
894 if (init == ridpointers[(int)RID_DELETE])
896 DECL_DELETED_FN (value) = 1;
897 DECL_DECLARED_INLINE_P (value) = 1;
898 DECL_INITIAL (value) = error_mark_node;
900 else if (init == ridpointers[(int)RID_DEFAULT])
902 if (defaultable_fn_check (value))
904 DECL_DEFAULTED_FN (value) = 1;
905 DECL_INITIALIZED_IN_CLASS_P (value) = 1;
906 DECL_DECLARED_INLINE_P (value) = 1;
909 else if (TREE_CODE (TREE_TYPE (value)) == METHOD_TYPE)
911 gcc_assert (error_operand_p (init) || integer_zerop (init));
912 DECL_PURE_VIRTUAL_P (value) = 1;
916 gcc_assert (TREE_CODE (TREE_TYPE (value)) == FUNCTION_TYPE);
917 error ("initializer specified for static member function %qD",
921 else if (pedantic && TREE_CODE (value) != VAR_DECL)
922 /* Already complained in grokdeclarator. */
924 else if (!processing_template_decl)
926 if (TREE_CODE (init) == CONSTRUCTOR)
927 init = digest_init (TREE_TYPE (value), init);
929 init = integral_constant_value (init);
931 if (init != error_mark_node && !TREE_CONSTANT (init))
933 /* We can allow references to things that are effectively
934 static, since references are initialized with the
936 if (TREE_CODE (TREE_TYPE (value)) != REFERENCE_TYPE
937 || (TREE_STATIC (init) == 0
938 && (!DECL_P (init) || DECL_EXTERNAL (init) == 0)))
940 error ("field initializer is not constant");
941 init = error_mark_node;
947 if (processing_template_decl
948 && (TREE_CODE (value) == VAR_DECL || TREE_CODE (value) == FUNCTION_DECL))
950 value = push_template_decl (value);
951 if (error_operand_p (value))
952 return error_mark_node;
956 cplus_decl_attributes (&value, attrlist, 0);
958 switch (TREE_CODE (value))
961 finish_static_data_member_decl (value, init, init_const_expr_p,
962 asmspec_tree, flags);
967 error ("%<asm%> specifiers are not permitted on non-static data members");
968 if (DECL_INITIAL (value) == error_mark_node)
969 init = error_mark_node;
970 cp_finish_decl (value, init, /*init_const_expr_p=*/false,
972 DECL_INITIAL (value) = init;
973 DECL_IN_AGGR_P (value) = 1;
978 set_user_assembler_name (value, asmspec);
980 cp_finish_decl (value,
982 /*init_const_expr_p=*/false,
983 asmspec_tree, flags);
985 /* Pass friends back this way. */
986 if (DECL_FRIEND_P (value))
987 return void_type_node;
989 DECL_IN_AGGR_P (value) = 1;
998 /* Like `grokfield', but for bitfields.
999 WIDTH is non-NULL for bit fields only, and is an INTEGER_CST node. */
1002 grokbitfield (const cp_declarator *declarator,
1003 cp_decl_specifier_seq *declspecs, tree width,
1006 tree value = grokdeclarator (declarator, declspecs, BITFIELD, 0, &attrlist);
1008 if (value == error_mark_node)
1009 return NULL_TREE; /* friends went bad. */
1011 /* Pass friendly classes back. */
1012 if (TREE_CODE (value) == VOID_TYPE)
1013 return void_type_node;
1015 if (!INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (TREE_TYPE (value))
1016 && (POINTER_TYPE_P (value)
1017 || !dependent_type_p (TREE_TYPE (value))))
1019 error ("bit-field %qD with non-integral type", value);
1020 return error_mark_node;
1023 if (TREE_CODE (value) == TYPE_DECL)
1025 error ("cannot declare %qD to be a bit-field type", value);
1029 /* Usually, finish_struct_1 catches bitfields with invalid types.
1030 But, in the case of bitfields with function type, we confuse
1031 ourselves into thinking they are member functions, so we must
1033 if (TREE_CODE (value) == FUNCTION_DECL)
1035 error ("cannot declare bit-field %qD with function type",
1040 if (DECL_IN_AGGR_P (value))
1042 error ("%qD is already defined in the class %qT", value,
1043 DECL_CONTEXT (value));
1044 return void_type_node;
1047 if (TREE_STATIC (value))
1049 error ("static member %qD cannot be a bit-field", value);
1052 cp_finish_decl (value, NULL_TREE, false, NULL_TREE, 0);
1054 if (width != error_mark_node)
1056 constant_expression_warning (width);
1057 DECL_INITIAL (value) = width;
1058 SET_DECL_C_BIT_FIELD (value);
1061 DECL_IN_AGGR_P (value) = 1;
1064 cplus_decl_attributes (&value, attrlist, /*flags=*/0);
1070 /* Returns true iff ATTR is an attribute which needs to be applied at
1071 instantiation time rather than template definition time. */
1074 is_late_template_attribute (tree attr, tree decl)
1076 tree name = TREE_PURPOSE (attr);
1077 tree args = TREE_VALUE (attr);
1078 const struct attribute_spec *spec = lookup_attribute_spec (name);
1082 /* Unknown attribute. */
1085 /* Attribute weak handling wants to write out assembly right away. */
1086 if (is_attribute_p ("weak", name))
1089 /* If any of the arguments are dependent expressions, we can't evaluate
1090 the attribute until instantiation time. */
1091 for (arg = args; arg; arg = TREE_CHAIN (arg))
1093 tree t = TREE_VALUE (arg);
1095 /* If the first attribute argument is an identifier, only consider
1096 second and following arguments. Attributes like mode, format,
1097 cleanup and several target specific attributes aren't late
1098 just because they have an IDENTIFIER_NODE as first argument. */
1099 if (arg == args && TREE_CODE (t) == IDENTIFIER_NODE)
1102 if (value_dependent_expression_p (t)
1103 || type_dependent_expression_p (t))
1107 if (TREE_CODE (decl) == TYPE_DECL
1109 || spec->type_required)
1111 tree type = TYPE_P (decl) ? decl : TREE_TYPE (decl);
1113 /* We can't apply any attributes to a completely unknown type until
1114 instantiation time. */
1115 enum tree_code code = TREE_CODE (type);
1116 if (code == TEMPLATE_TYPE_PARM
1117 || code == BOUND_TEMPLATE_TEMPLATE_PARM
1118 || code == TYPENAME_TYPE)
1120 /* Also defer most attributes on dependent types. This is not
1121 necessary in all cases, but is the better default. */
1122 else if (dependent_type_p (type)
1123 /* But attribute visibility specifically works on
1125 && !is_attribute_p ("visibility", name))
1134 /* ATTR_P is a list of attributes. Remove any attributes which need to be
1135 applied at instantiation time and return them. If IS_DEPENDENT is true,
1136 the declaration itself is dependent, so all attributes should be applied
1137 at instantiation time. */
1140 splice_template_attributes (tree *attr_p, tree decl)
1143 tree late_attrs = NULL_TREE;
1144 tree *q = &late_attrs;
1151 if (is_late_template_attribute (*p, decl))
1153 ATTR_IS_DEPENDENT (*p) = 1;
1155 *p = TREE_CHAIN (*p);
1156 q = &TREE_CHAIN (*q);
1160 p = &TREE_CHAIN (*p);
1166 /* Remove any late attributes from the list in ATTR_P and attach them to
1170 save_template_attributes (tree *attr_p, tree *decl_p)
1172 tree late_attrs = splice_template_attributes (attr_p, *decl_p);
1174 tree old_attrs = NULL_TREE;
1179 if (DECL_P (*decl_p))
1180 q = &DECL_ATTRIBUTES (*decl_p);
1182 q = &TYPE_ATTRIBUTES (*decl_p);
1186 /* Place the late attributes at the beginning of the attribute
1188 TREE_CHAIN (tree_last (late_attrs)) = *q;
1191 if (!DECL_P (*decl_p) && *decl_p == TYPE_MAIN_VARIANT (*decl_p))
1193 /* We've added new attributes directly to the main variant, so
1194 now we need to update all of the other variants to include
1195 these new attributes. */
1197 for (variant = TYPE_NEXT_VARIANT (*decl_p); variant;
1198 variant = TYPE_NEXT_VARIANT (variant))
1200 gcc_assert (TYPE_ATTRIBUTES (variant) == old_attrs);
1201 TYPE_ATTRIBUTES (variant) = TYPE_ATTRIBUTES (*decl_p);
1206 /* Like reconstruct_complex_type, but handle also template trees. */
1209 cp_reconstruct_complex_type (tree type, tree bottom)
1213 if (TREE_CODE (type) == POINTER_TYPE)
1215 inner = cp_reconstruct_complex_type (TREE_TYPE (type), bottom);
1216 outer = build_pointer_type_for_mode (inner, TYPE_MODE (type),
1217 TYPE_REF_CAN_ALIAS_ALL (type));
1219 else if (TREE_CODE (type) == REFERENCE_TYPE)
1221 inner = cp_reconstruct_complex_type (TREE_TYPE (type), bottom);
1222 outer = build_reference_type_for_mode (inner, TYPE_MODE (type),
1223 TYPE_REF_CAN_ALIAS_ALL (type));
1225 else if (TREE_CODE (type) == ARRAY_TYPE)
1227 inner = cp_reconstruct_complex_type (TREE_TYPE (type), bottom);
1228 outer = build_cplus_array_type (inner, TYPE_DOMAIN (type));
1229 /* Don't call cp_build_qualified_type on ARRAY_TYPEs, the
1230 element type qualification will be handled by the recursive
1231 cp_reconstruct_complex_type call and cp_build_qualified_type
1232 for ARRAY_TYPEs changes the element type. */
1235 else if (TREE_CODE (type) == FUNCTION_TYPE)
1237 inner = cp_reconstruct_complex_type (TREE_TYPE (type), bottom);
1238 outer = build_function_type (inner, TYPE_ARG_TYPES (type));
1240 else if (TREE_CODE (type) == METHOD_TYPE)
1242 inner = cp_reconstruct_complex_type (TREE_TYPE (type), bottom);
1243 /* The build_method_type_directly() routine prepends 'this' to argument list,
1244 so we must compensate by getting rid of it. */
1246 = build_method_type_directly
1247 (TREE_TYPE (TREE_VALUE (TYPE_ARG_TYPES (type))),
1249 TREE_CHAIN (TYPE_ARG_TYPES (type)));
1251 else if (TREE_CODE (type) == OFFSET_TYPE)
1253 inner = cp_reconstruct_complex_type (TREE_TYPE (type), bottom);
1254 outer = build_offset_type (TYPE_OFFSET_BASETYPE (type), inner);
1259 if (TYPE_ATTRIBUTES (type))
1260 outer = cp_build_type_attribute_variant (outer, TYPE_ATTRIBUTES (type));
1261 return cp_build_qualified_type (outer, TYPE_QUALS (type));
1264 /* Like decl_attributes, but handle C++ complexity. */
1267 cplus_decl_attributes (tree *decl, tree attributes, int flags)
1269 if (*decl == NULL_TREE || *decl == void_type_node
1270 || *decl == error_mark_node
1271 || attributes == NULL_TREE)
1274 if (processing_template_decl)
1276 if (check_for_bare_parameter_packs (attributes))
1279 save_template_attributes (&attributes, decl);
1280 if (attributes == NULL_TREE)
1284 if (TREE_CODE (*decl) == TEMPLATE_DECL)
1285 decl = &DECL_TEMPLATE_RESULT (*decl);
1287 decl_attributes (decl, attributes, flags);
1289 if (TREE_CODE (*decl) == TYPE_DECL)
1290 SET_IDENTIFIER_TYPE_VALUE (DECL_NAME (*decl), TREE_TYPE (*decl));
1293 /* Walks through the namespace- or function-scope anonymous union
1294 OBJECT, with the indicated TYPE, building appropriate VAR_DECLs.
1295 Returns one of the fields for use in the mangled name. */
1298 build_anon_union_vars (tree type, tree object)
1300 tree main_decl = NULL_TREE;
1303 /* Rather than write the code to handle the non-union case,
1304 just give an error. */
1305 if (TREE_CODE (type) != UNION_TYPE)
1306 error ("anonymous struct not inside named type");
1308 for (field = TYPE_FIELDS (type);
1310 field = TREE_CHAIN (field))
1315 if (DECL_ARTIFICIAL (field))
1317 if (TREE_CODE (field) != FIELD_DECL)
1319 permerror (input_location, "%q+#D invalid; an anonymous union can only "
1320 "have non-static data members", field);
1324 if (TREE_PRIVATE (field))
1325 permerror (input_location, "private member %q+#D in anonymous union", field);
1326 else if (TREE_PROTECTED (field))
1327 permerror (input_location, "protected member %q+#D in anonymous union", field);
1329 if (processing_template_decl)
1330 ref = build_min_nt (COMPONENT_REF, object,
1331 DECL_NAME (field), NULL_TREE);
1333 ref = build_class_member_access_expr (object, field, NULL_TREE,
1334 false, tf_warning_or_error);
1336 if (DECL_NAME (field))
1340 decl = build_decl (input_location,
1341 VAR_DECL, DECL_NAME (field), TREE_TYPE (field));
1342 DECL_ANON_UNION_VAR_P (decl) = 1;
1343 DECL_ARTIFICIAL (decl) = 1;
1345 base = get_base_address (object);
1346 TREE_PUBLIC (decl) = TREE_PUBLIC (base);
1347 TREE_STATIC (decl) = TREE_STATIC (base);
1348 DECL_EXTERNAL (decl) = DECL_EXTERNAL (base);
1350 SET_DECL_VALUE_EXPR (decl, ref);
1351 DECL_HAS_VALUE_EXPR_P (decl) = 1;
1353 decl = pushdecl (decl);
1355 else if (ANON_AGGR_TYPE_P (TREE_TYPE (field)))
1356 decl = build_anon_union_vars (TREE_TYPE (field), ref);
1360 if (main_decl == NULL_TREE)
1367 /* Finish off the processing of a UNION_TYPE structure. If the union is an
1368 anonymous union, then all members must be laid out together. PUBLIC_P
1369 is nonzero if this union is not declared static. */
1372 finish_anon_union (tree anon_union_decl)
1378 if (anon_union_decl == error_mark_node)
1381 type = TREE_TYPE (anon_union_decl);
1382 public_p = TREE_PUBLIC (anon_union_decl);
1384 /* The VAR_DECL's context is the same as the TYPE's context. */
1385 DECL_CONTEXT (anon_union_decl) = DECL_CONTEXT (TYPE_NAME (type));
1387 if (TYPE_FIELDS (type) == NULL_TREE)
1392 error ("namespace-scope anonymous aggregates must be static");
1396 main_decl = build_anon_union_vars (type, anon_union_decl);
1397 if (main_decl == error_mark_node)
1399 if (main_decl == NULL_TREE)
1401 warning (0, "anonymous union with no members");
1405 if (!processing_template_decl)
1407 /* Use main_decl to set the mangled name. */
1408 DECL_NAME (anon_union_decl) = DECL_NAME (main_decl);
1409 maybe_commonize_var (anon_union_decl);
1410 mangle_decl (anon_union_decl);
1411 DECL_NAME (anon_union_decl) = NULL_TREE;
1414 pushdecl (anon_union_decl);
1415 if (building_stmt_tree ()
1416 && at_function_scope_p ())
1417 add_decl_expr (anon_union_decl);
1418 else if (!processing_template_decl)
1419 rest_of_decl_compilation (anon_union_decl,
1420 toplevel_bindings_p (), at_eof);
1423 /* Auxiliary functions to make type signatures for
1424 `operator new' and `operator delete' correspond to
1425 what compiler will be expecting. */
1428 coerce_new_type (tree type)
1431 tree args = TYPE_ARG_TYPES (type);
1433 gcc_assert (TREE_CODE (type) == FUNCTION_TYPE);
1435 if (!same_type_p (TREE_TYPE (type), ptr_type_node))
1438 error ("%<operator new%> must return type %qT", ptr_type_node);
1441 if (args && args != void_list_node)
1443 if (TREE_PURPOSE (args))
1445 /* [basic.stc.dynamic.allocation]
1447 The first parameter shall not have an associated default
1449 error ("the first parameter of %<operator new%> cannot "
1450 "have a default argument");
1451 /* Throw away the default argument. */
1452 TREE_PURPOSE (args) = NULL_TREE;
1455 if (!same_type_p (TREE_VALUE (args), size_type_node))
1458 args = TREE_CHAIN (args);
1465 permerror (input_location, "%<operator new%> takes type %<size_t%> (%qT) "
1466 "as first parameter", size_type_node);
1471 args = tree_cons (NULL_TREE, size_type_node, args);
1474 type = build_exception_variant
1475 (build_function_type (ptr_type_node, args),
1476 TYPE_RAISES_EXCEPTIONS (type));
1484 coerce_delete_type (tree type)
1487 tree args = TYPE_ARG_TYPES (type);
1489 gcc_assert (TREE_CODE (type) == FUNCTION_TYPE);
1491 if (!same_type_p (TREE_TYPE (type), void_type_node))
1494 error ("%<operator delete%> must return type %qT", void_type_node);
1497 if (!args || args == void_list_node
1498 || !same_type_p (TREE_VALUE (args), ptr_type_node))
1501 if (args && args != void_list_node)
1502 args = TREE_CHAIN (args);
1503 error ("%<operator delete%> takes type %qT as first parameter",
1509 args = tree_cons (NULL_TREE, ptr_type_node, args);
1512 type = build_exception_variant
1513 (build_function_type (void_type_node, args),
1514 TYPE_RAISES_EXCEPTIONS (type));
1522 /* DECL is a VAR_DECL for a vtable: walk through the entries in the vtable
1523 and mark them as needed. */
1526 mark_vtable_entries (tree decl)
1529 unsigned HOST_WIDE_INT idx;
1531 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (DECL_INITIAL (decl)),
1536 STRIP_NOPS (fnaddr);
1538 if (TREE_CODE (fnaddr) != ADDR_EXPR
1539 && TREE_CODE (fnaddr) != FDESC_EXPR)
1540 /* This entry is an offset: a virtual base class offset, a
1541 virtual call offset, an RTTI offset, etc. */
1544 fn = TREE_OPERAND (fnaddr, 0);
1545 TREE_ADDRESSABLE (fn) = 1;
1546 /* When we don't have vcall offsets, we output thunks whenever
1547 we output the vtables that contain them. With vcall offsets,
1548 we know all the thunks we'll need when we emit a virtual
1549 function, so we emit the thunks there instead. */
1550 if (DECL_THUNK_P (fn))
1551 use_thunk (fn, /*emit_p=*/0);
1556 /* Set DECL up to have the closest approximation of "initialized common"
1557 linkage available. */
1560 comdat_linkage (tree decl)
1563 make_decl_one_only (decl, cxx_comdat_group (decl));
1564 else if (TREE_CODE (decl) == FUNCTION_DECL
1565 || (TREE_CODE (decl) == VAR_DECL && DECL_ARTIFICIAL (decl)))
1566 /* We can just emit function and compiler-generated variables
1567 statically; having multiple copies is (for the most part) only
1570 There are two correctness issues, however: the address of a
1571 template instantiation with external linkage should be the
1572 same, independent of what translation unit asks for the
1573 address, and this will not hold when we emit multiple copies of
1574 the function. However, there's little else we can do.
1576 Also, by default, the typeinfo implementation assumes that
1577 there will be only one copy of the string used as the name for
1578 each type. Therefore, if weak symbols are unavailable, the
1579 run-time library should perform a more conservative check; it
1580 should perform a string comparison, rather than an address
1582 TREE_PUBLIC (decl) = 0;
1585 /* Static data member template instantiations, however, cannot
1586 have multiple copies. */
1587 if (DECL_INITIAL (decl) == 0
1588 || DECL_INITIAL (decl) == error_mark_node)
1589 DECL_COMMON (decl) = 1;
1590 else if (EMPTY_CONSTRUCTOR_P (DECL_INITIAL (decl)))
1592 DECL_COMMON (decl) = 1;
1593 DECL_INITIAL (decl) = error_mark_node;
1595 else if (!DECL_EXPLICIT_INSTANTIATION (decl))
1597 /* We can't do anything useful; leave vars for explicit
1599 DECL_EXTERNAL (decl) = 1;
1600 DECL_NOT_REALLY_EXTERN (decl) = 0;
1604 DECL_COMDAT (decl) = 1;
1607 /* For win32 we also want to put explicit instantiations in
1608 linkonce sections, so that they will be merged with implicit
1609 instantiations; otherwise we get duplicate symbol errors.
1610 For Darwin we do not want explicit instantiations to be
1614 maybe_make_one_only (tree decl)
1616 /* We used to say that this was not necessary on targets that support weak
1617 symbols, because the implicit instantiations will defer to the explicit
1618 one. However, that's not actually the case in SVR4; a strong definition
1619 after a weak one is an error. Also, not making explicit
1620 instantiations one_only means that we can end up with two copies of
1621 some template instantiations. */
1625 /* We can't set DECL_COMDAT on functions, or cp_finish_file will think
1626 we can get away with not emitting them if they aren't used. We need
1627 to for variables so that cp_finish_decl will update their linkage,
1628 because their DECL_INITIAL may not have been set properly yet. */
1630 if (!TARGET_WEAK_NOT_IN_ARCHIVE_TOC
1631 || (! DECL_EXPLICIT_INSTANTIATION (decl)
1632 && ! DECL_TEMPLATE_SPECIALIZATION (decl)))
1634 make_decl_one_only (decl, cxx_comdat_group (decl));
1636 if (TREE_CODE (decl) == VAR_DECL)
1638 DECL_COMDAT (decl) = 1;
1639 /* Mark it needed so we don't forget to emit it. */
1640 mark_decl_referenced (decl);
1645 /* Returns true iff DECL, a FUNCTION_DECL, has vague linkage. This
1646 predicate will give the right answer during parsing of the function,
1647 which other tests may not. */
1650 vague_linkage_fn_p (tree fn)
1652 /* Unfortunately, import_export_decl has not always been called
1653 before the function is processed, so we cannot simply check
1655 return (DECL_COMDAT (fn)
1656 || ((DECL_DECLARED_INLINE_P (fn)
1657 || DECL_TEMPLATE_INSTANTIATION (fn))
1658 && TREE_PUBLIC (fn)));
1661 /* Determine whether or not we want to specifically import or export CTYPE,
1662 using various heuristics. */
1665 import_export_class (tree ctype)
1667 /* -1 for imported, 1 for exported. */
1668 int import_export = 0;
1670 /* It only makes sense to call this function at EOF. The reason is
1671 that this function looks at whether or not the first non-inline
1672 non-abstract virtual member function has been defined in this
1673 translation unit. But, we can't possibly know that until we've
1674 seen the entire translation unit. */
1675 gcc_assert (at_eof);
1677 if (CLASSTYPE_INTERFACE_KNOWN (ctype))
1680 /* If MULTIPLE_SYMBOL_SPACES is set and we saw a #pragma interface,
1681 we will have CLASSTYPE_INTERFACE_ONLY set but not
1682 CLASSTYPE_INTERFACE_KNOWN. In that case, we don't want to use this
1683 heuristic because someone will supply a #pragma implementation
1684 elsewhere, and deducing it here would produce a conflict. */
1685 if (CLASSTYPE_INTERFACE_ONLY (ctype))
1688 if (lookup_attribute ("dllimport", TYPE_ATTRIBUTES (ctype)))
1690 else if (lookup_attribute ("dllexport", TYPE_ATTRIBUTES (ctype)))
1692 else if (CLASSTYPE_IMPLICIT_INSTANTIATION (ctype)
1693 && !flag_implicit_templates)
1694 /* For a template class, without -fimplicit-templates, check the
1695 repository. If the virtual table is assigned to this
1696 translation unit, then export the class; otherwise, import
1698 import_export = repo_export_class_p (ctype) ? 1 : -1;
1699 else if (TYPE_POLYMORPHIC_P (ctype))
1701 /* The ABI specifies that the virtual table and associated
1702 information are emitted with the key method, if any. */
1703 tree method = CLASSTYPE_KEY_METHOD (ctype);
1704 /* If weak symbol support is not available, then we must be
1705 careful not to emit the vtable when the key function is
1706 inline. An inline function can be defined in multiple
1707 translation units. If we were to emit the vtable in each
1708 translation unit containing a definition, we would get
1709 multiple definition errors at link-time. */
1710 if (method && (flag_weak || ! DECL_DECLARED_INLINE_P (method)))
1711 import_export = (DECL_REALLY_EXTERN (method) ? -1 : 1);
1714 /* When MULTIPLE_SYMBOL_SPACES is set, we cannot count on seeing
1715 a definition anywhere else. */
1716 if (MULTIPLE_SYMBOL_SPACES && import_export == -1)
1719 /* Allow back ends the chance to overrule the decision. */
1720 if (targetm.cxx.import_export_class)
1721 import_export = targetm.cxx.import_export_class (ctype, import_export);
1725 SET_CLASSTYPE_INTERFACE_KNOWN (ctype);
1726 CLASSTYPE_INTERFACE_ONLY (ctype) = (import_export < 0);
1730 /* Return true if VAR has already been provided to the back end; in that
1731 case VAR should not be modified further by the front end. */
1733 var_finalized_p (tree var)
1735 return varpool_node (var)->finalized;
1738 /* DECL is a VAR_DECL or FUNCTION_DECL which, for whatever reason,
1739 must be emitted in this translation unit. Mark it as such. */
1742 mark_needed (tree decl)
1744 /* It's possible that we no longer need to set
1745 TREE_SYMBOL_REFERENCED here directly, but doing so is
1747 TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)) = 1;
1748 mark_decl_referenced (decl);
1751 /* DECL is either a FUNCTION_DECL or a VAR_DECL. This function
1752 returns true if a definition of this entity should be provided in
1753 this object file. Callers use this function to determine whether
1754 or not to let the back end know that a definition of DECL is
1755 available in this translation unit. */
1758 decl_needed_p (tree decl)
1760 gcc_assert (TREE_CODE (decl) == VAR_DECL
1761 || TREE_CODE (decl) == FUNCTION_DECL);
1762 /* This function should only be called at the end of the translation
1763 unit. We cannot be sure of whether or not something will be
1764 COMDAT until that point. */
1765 gcc_assert (at_eof);
1767 /* All entities with external linkage that are not COMDAT should be
1768 emitted; they may be referred to from other object files. */
1769 if (TREE_PUBLIC (decl) && !DECL_COMDAT (decl))
1771 /* If this entity was used, let the back end see it; it will decide
1772 whether or not to emit it into the object file. */
1773 if (TREE_USED (decl)
1774 || (DECL_ASSEMBLER_NAME_SET_P (decl)
1775 && TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))))
1777 /* Functions marked "dllexport" must be emitted so that they are
1778 visible to other DLLs. */
1779 if (lookup_attribute ("dllexport", DECL_ATTRIBUTES (decl)))
1781 /* Otherwise, DECL does not need to be emitted -- yet. A subsequent
1782 reference to DECL might cause it to be emitted later. */
1786 /* If necessary, write out the vtables for the dynamic class CTYPE.
1787 Returns true if any vtables were emitted. */
1790 maybe_emit_vtables (tree ctype)
1796 /* If the vtables for this class have already been emitted there is
1797 nothing more to do. */
1798 primary_vtbl = CLASSTYPE_VTABLES (ctype);
1799 if (var_finalized_p (primary_vtbl))
1801 /* Ignore dummy vtables made by get_vtable_decl. */
1802 if (TREE_TYPE (primary_vtbl) == void_type_node)
1805 /* On some targets, we cannot determine the key method until the end
1806 of the translation unit -- which is when this function is
1808 if (!targetm.cxx.key_method_may_be_inline ())
1809 determine_key_method (ctype);
1811 /* See if any of the vtables are needed. */
1812 for (vtbl = CLASSTYPE_VTABLES (ctype); vtbl; vtbl = TREE_CHAIN (vtbl))
1814 import_export_decl (vtbl);
1815 if (DECL_NOT_REALLY_EXTERN (vtbl) && decl_needed_p (vtbl))
1820 /* If the references to this class' vtables are optimized away,
1821 still emit the appropriate debugging information. See
1823 if (DECL_COMDAT (primary_vtbl)
1824 && CLASSTYPE_DEBUG_REQUESTED (ctype))
1825 note_debug_info_needed (ctype);
1829 /* The ABI requires that we emit all of the vtables if we emit any
1831 for (vtbl = CLASSTYPE_VTABLES (ctype); vtbl; vtbl = TREE_CHAIN (vtbl))
1833 /* Mark entities references from the virtual table as used. */
1834 mark_vtable_entries (vtbl);
1836 if (TREE_TYPE (DECL_INITIAL (vtbl)) == 0)
1838 tree expr = store_init_value (vtbl, DECL_INITIAL (vtbl), LOOKUP_NORMAL);
1840 /* It had better be all done at compile-time. */
1845 DECL_EXTERNAL (vtbl) = 0;
1846 rest_of_decl_compilation (vtbl, 1, 1);
1848 /* Because we're only doing syntax-checking, we'll never end up
1849 actually marking the variable as written. */
1850 if (flag_syntax_only)
1851 TREE_ASM_WRITTEN (vtbl) = 1;
1854 /* Since we're writing out the vtable here, also write the debug
1856 note_debug_info_needed (ctype);
1861 /* A special return value from type_visibility meaning internal
1864 enum { VISIBILITY_ANON = VISIBILITY_INTERNAL+1 };
1866 /* walk_tree helper function for type_visibility. */
1869 min_vis_r (tree *tp, int *walk_subtrees, void *data)
1871 int *vis_p = (int *)data;
1876 else if (CLASS_TYPE_P (*tp))
1878 if (!TREE_PUBLIC (TYPE_MAIN_DECL (*tp)))
1880 *vis_p = VISIBILITY_ANON;
1883 else if (CLASSTYPE_VISIBILITY (*tp) > *vis_p)
1884 *vis_p = CLASSTYPE_VISIBILITY (*tp);
1889 /* Returns the visibility of TYPE, which is the minimum visibility of its
1893 type_visibility (tree type)
1895 int vis = VISIBILITY_DEFAULT;
1896 cp_walk_tree_without_duplicates (&type, min_vis_r, &vis);
1900 /* Limit the visibility of DECL to VISIBILITY, if not explicitly
1901 specified (or if VISIBILITY is static). */
1904 constrain_visibility (tree decl, int visibility)
1906 if (visibility == VISIBILITY_ANON)
1908 /* extern "C" declarations aren't affected by the anonymous
1910 if (!DECL_EXTERN_C_P (decl))
1912 TREE_PUBLIC (decl) = 0;
1913 DECL_WEAK (decl) = 0;
1914 DECL_COMMON (decl) = 0;
1915 DECL_COMDAT_GROUP (decl) = NULL_TREE;
1916 DECL_INTERFACE_KNOWN (decl) = 1;
1917 if (DECL_LANG_SPECIFIC (decl))
1918 DECL_NOT_REALLY_EXTERN (decl) = 1;
1921 else if (visibility > DECL_VISIBILITY (decl)
1922 && !DECL_VISIBILITY_SPECIFIED (decl))
1924 DECL_VISIBILITY (decl) = (enum symbol_visibility) visibility;
1930 /* Constrain the visibility of DECL based on the visibility of its template
1934 constrain_visibility_for_template (tree decl, tree targs)
1936 /* If this is a template instantiation, check the innermost
1937 template args for visibility constraints. The outer template
1938 args are covered by the class check. */
1939 tree args = INNERMOST_TEMPLATE_ARGS (targs);
1941 for (i = TREE_VEC_LENGTH (args); i > 0; --i)
1945 tree arg = TREE_VEC_ELT (args, i-1);
1947 vis = type_visibility (arg);
1948 else if (TREE_TYPE (arg) && POINTER_TYPE_P (TREE_TYPE (arg)))
1951 if (TREE_CODE (arg) == ADDR_EXPR)
1952 arg = TREE_OPERAND (arg, 0);
1953 if (TREE_CODE (arg) == VAR_DECL
1954 || TREE_CODE (arg) == FUNCTION_DECL)
1956 if (! TREE_PUBLIC (arg))
1957 vis = VISIBILITY_ANON;
1959 vis = DECL_VISIBILITY (arg);
1963 constrain_visibility (decl, vis);
1967 /* Like c_determine_visibility, but with additional C++-specific
1970 Function-scope entities can rely on the function's visibility because
1971 it is set in start_preparsed_function.
1973 Class-scope entities cannot rely on the class's visibility until the end
1974 of the enclosing class definition.
1976 Note that because namespaces have multiple independent definitions,
1977 namespace visibility is handled elsewhere using the #pragma visibility
1978 machinery rather than by decorating the namespace declaration.
1980 The goal is for constraints from the type to give a diagnostic, and
1981 other constraints to be applied silently. */
1984 determine_visibility (tree decl)
1986 tree class_type = NULL_TREE;
1988 bool orig_visibility_specified;
1989 enum symbol_visibility orig_visibility;
1991 /* Remember that all decls get VISIBILITY_DEFAULT when built. */
1993 /* Only relevant for names with external linkage. */
1994 if (!TREE_PUBLIC (decl))
1997 /* Cloned constructors and destructors get the same visibility as
1998 the underlying function. That should be set up in
1999 maybe_clone_body. */
2000 gcc_assert (!DECL_CLONED_FUNCTION_P (decl));
2002 orig_visibility_specified = DECL_VISIBILITY_SPECIFIED (decl);
2003 orig_visibility = DECL_VISIBILITY (decl);
2005 if (TREE_CODE (decl) == TYPE_DECL)
2007 if (CLASS_TYPE_P (TREE_TYPE (decl)))
2008 use_template = CLASSTYPE_USE_TEMPLATE (TREE_TYPE (decl));
2009 else if (TYPE_TEMPLATE_INFO (TREE_TYPE (decl)))
2014 else if (DECL_LANG_SPECIFIC (decl))
2015 use_template = DECL_USE_TEMPLATE (decl);
2019 /* If DECL is a member of a class, visibility specifiers on the
2020 class can influence the visibility of the DECL. */
2021 if (DECL_CLASS_SCOPE_P (decl))
2022 class_type = DECL_CONTEXT (decl);
2025 /* Not a class member. */
2027 /* Virtual tables have DECL_CONTEXT set to their associated class,
2028 so they are automatically handled above. */
2029 gcc_assert (TREE_CODE (decl) != VAR_DECL
2030 || !DECL_VTABLE_OR_VTT_P (decl));
2032 if (DECL_FUNCTION_SCOPE_P (decl) && ! DECL_VISIBILITY_SPECIFIED (decl))
2034 /* Local statics and classes get the visibility of their
2035 containing function by default, except that
2036 -fvisibility-inlines-hidden doesn't affect them. */
2037 tree fn = DECL_CONTEXT (decl);
2038 if (DECL_VISIBILITY_SPECIFIED (fn) || ! DECL_CLASS_SCOPE_P (fn))
2040 DECL_VISIBILITY (decl) = DECL_VISIBILITY (fn);
2041 DECL_VISIBILITY_SPECIFIED (decl) =
2042 DECL_VISIBILITY_SPECIFIED (fn);
2045 determine_visibility_from_class (decl, DECL_CONTEXT (fn));
2047 /* Local classes in templates have CLASSTYPE_USE_TEMPLATE set,
2048 but have no TEMPLATE_INFO, so don't try to check it. */
2051 else if (TREE_CODE (decl) == VAR_DECL && DECL_TINFO_P (decl)
2052 && flag_visibility_ms_compat)
2054 /* Under -fvisibility-ms-compat, types are visible by default,
2055 even though their contents aren't. */
2056 tree underlying_type = TREE_TYPE (DECL_NAME (decl));
2057 int underlying_vis = type_visibility (underlying_type);
2058 if (underlying_vis == VISIBILITY_ANON
2059 || CLASSTYPE_VISIBILITY_SPECIFIED (underlying_type))
2060 constrain_visibility (decl, underlying_vis);
2062 DECL_VISIBILITY (decl) = VISIBILITY_DEFAULT;
2064 else if (TREE_CODE (decl) == VAR_DECL && DECL_TINFO_P (decl))
2066 /* tinfo visibility is based on the type it's for. */
2067 constrain_visibility
2068 (decl, type_visibility (TREE_TYPE (DECL_NAME (decl))));
2070 /* Give the target a chance to override the visibility associated
2072 if (TREE_PUBLIC (decl)
2073 && !DECL_REALLY_EXTERN (decl)
2074 && CLASS_TYPE_P (TREE_TYPE (DECL_NAME (decl)))
2075 && !CLASSTYPE_VISIBILITY_SPECIFIED (TREE_TYPE (DECL_NAME (decl))))
2076 targetm.cxx.determine_class_data_visibility (decl);
2078 else if (use_template)
2079 /* Template instantiations and specializations get visibility based
2080 on their template unless they override it with an attribute. */;
2081 else if (! DECL_VISIBILITY_SPECIFIED (decl))
2083 /* Set default visibility to whatever the user supplied with
2084 #pragma GCC visibility or a namespace visibility attribute. */
2085 DECL_VISIBILITY (decl) = default_visibility;
2086 DECL_VISIBILITY_SPECIFIED (decl) = visibility_options.inpragma;
2092 /* If the specialization doesn't specify visibility, use the
2093 visibility from the template. */
2094 tree tinfo = (TREE_CODE (decl) == TYPE_DECL
2095 ? TYPE_TEMPLATE_INFO (TREE_TYPE (decl))
2096 : DECL_TEMPLATE_INFO (decl));
2097 tree args = TI_ARGS (tinfo);
2099 if (args != error_mark_node)
2101 int depth = TMPL_ARGS_DEPTH (args);
2102 tree pattern = DECL_TEMPLATE_RESULT (TI_TEMPLATE (tinfo));
2104 if (!DECL_VISIBILITY_SPECIFIED (decl))
2106 DECL_VISIBILITY (decl) = DECL_VISIBILITY (pattern);
2107 DECL_VISIBILITY_SPECIFIED (decl)
2108 = DECL_VISIBILITY_SPECIFIED (pattern);
2111 /* FIXME should TMPL_ARGS_DEPTH really return 1 for null input? */
2112 if (args && depth > template_class_depth (class_type))
2113 /* Limit visibility based on its template arguments. */
2114 constrain_visibility_for_template (decl, args);
2119 determine_visibility_from_class (decl, class_type);
2121 if (decl_anon_ns_mem_p (decl))
2122 /* Names in an anonymous namespace get internal linkage.
2123 This might change once we implement export. */
2124 constrain_visibility (decl, VISIBILITY_ANON);
2125 else if (TREE_CODE (decl) != TYPE_DECL)
2127 /* Propagate anonymity from type to decl. */
2128 int tvis = type_visibility (TREE_TYPE (decl));
2129 if (tvis == VISIBILITY_ANON
2130 || ! DECL_VISIBILITY_SPECIFIED (decl))
2131 constrain_visibility (decl, tvis);
2133 else if (no_linkage_check (TREE_TYPE (decl), /*relaxed_p=*/true))
2134 /* DR 757: A type without linkage shall not be used as the type of a
2135 variable or function with linkage, unless
2136 o the variable or function has extern "C" linkage (7.5 [dcl.link]), or
2137 o the variable or function is not used (3.2 [basic.def.odr]) or is
2138 defined in the same translation unit.
2140 Since non-extern "C" decls need to be defined in the same
2141 translation unit, we can make the type internal. */
2142 constrain_visibility (decl, VISIBILITY_ANON);
2144 /* If visibility changed and DECL already has DECL_RTL, ensure
2145 symbol flags are updated. */
2146 if ((DECL_VISIBILITY (decl) != orig_visibility
2147 || DECL_VISIBILITY_SPECIFIED (decl) != orig_visibility_specified)
2148 && ((TREE_CODE (decl) == VAR_DECL && TREE_STATIC (decl))
2149 || TREE_CODE (decl) == FUNCTION_DECL)
2150 && DECL_RTL_SET_P (decl))
2151 make_decl_rtl (decl);
2154 /* By default, static data members and function members receive
2155 the visibility of their containing class. */
2158 determine_visibility_from_class (tree decl, tree class_type)
2160 if (DECL_VISIBILITY_SPECIFIED (decl))
2163 if (visibility_options.inlines_hidden
2164 /* Don't do this for inline templates; specializations might not be
2165 inline, and we don't want them to inherit the hidden
2166 visibility. We'll set it here for all inline instantiations. */
2167 && !processing_template_decl
2168 && TREE_CODE (decl) == FUNCTION_DECL
2169 && DECL_DECLARED_INLINE_P (decl)
2170 && (! DECL_LANG_SPECIFIC (decl)
2171 || ! DECL_EXPLICIT_INSTANTIATION (decl)))
2172 DECL_VISIBILITY (decl) = VISIBILITY_HIDDEN;
2175 /* Default to the class visibility. */
2176 DECL_VISIBILITY (decl) = CLASSTYPE_VISIBILITY (class_type);
2177 DECL_VISIBILITY_SPECIFIED (decl)
2178 = CLASSTYPE_VISIBILITY_SPECIFIED (class_type);
2181 /* Give the target a chance to override the visibility associated
2183 if (TREE_CODE (decl) == VAR_DECL
2184 && (DECL_TINFO_P (decl)
2185 || (DECL_VTABLE_OR_VTT_P (decl)
2186 /* Construction virtual tables are not exported because
2187 they cannot be referred to from other object files;
2188 their name is not standardized by the ABI. */
2189 && !DECL_CONSTRUCTION_VTABLE_P (decl)))
2190 && TREE_PUBLIC (decl)
2191 && !DECL_REALLY_EXTERN (decl)
2192 && !CLASSTYPE_VISIBILITY_SPECIFIED (class_type))
2193 targetm.cxx.determine_class_data_visibility (decl);
2196 /* Constrain the visibility of a class TYPE based on the visibility of its
2197 field types. Warn if any fields require lesser visibility. */
2200 constrain_class_visibility (tree type)
2206 int vis = type_visibility (type);
2208 if (vis == VISIBILITY_ANON
2209 || DECL_IN_SYSTEM_HEADER (TYPE_MAIN_DECL (type)))
2212 /* Don't warn about visibility if the class has explicit visibility. */
2213 if (CLASSTYPE_VISIBILITY_SPECIFIED (type))
2214 vis = VISIBILITY_INTERNAL;
2216 for (t = TYPE_FIELDS (type); t; t = TREE_CHAIN (t))
2217 if (TREE_CODE (t) == FIELD_DECL && TREE_TYPE (t) != error_mark_node)
2219 tree ftype = strip_pointer_or_array_types (TREE_TYPE (t));
2220 int subvis = type_visibility (ftype);
2222 if (subvis == VISIBILITY_ANON)
2224 if (!in_main_input_context ())
2226 %qT has a field %qD whose type uses the anonymous namespace",
2229 else if (MAYBE_CLASS_TYPE_P (ftype)
2230 && vis < VISIBILITY_HIDDEN
2231 && subvis >= VISIBILITY_HIDDEN)
2232 warning (OPT_Wattributes, "\
2233 %qT declared with greater visibility than the type of its field %qD",
2237 binfo = TYPE_BINFO (type);
2238 for (i = 0; BINFO_BASE_ITERATE (binfo, i, t); ++i)
2240 int subvis = type_visibility (TREE_TYPE (t));
2242 if (subvis == VISIBILITY_ANON)
2244 if (!in_main_input_context())
2246 %qT has a base %qT whose type uses the anonymous namespace",
2247 type, TREE_TYPE (t));
2249 else if (vis < VISIBILITY_HIDDEN
2250 && subvis >= VISIBILITY_HIDDEN)
2251 warning (OPT_Wattributes, "\
2252 %qT declared with greater visibility than its base %qT",
2253 type, TREE_TYPE (t));
2257 /* DECL is a FUNCTION_DECL or VAR_DECL. If the object file linkage
2258 for DECL has not already been determined, do so now by setting
2259 DECL_EXTERNAL, DECL_COMDAT and other related flags. Until this
2260 function is called entities with vague linkage whose definitions
2261 are available must have TREE_PUBLIC set.
2263 If this function decides to place DECL in COMDAT, it will set
2264 appropriate flags -- but will not clear DECL_EXTERNAL. It is up to
2265 the caller to decide whether or not to clear DECL_EXTERNAL. Some
2266 callers defer that decision until it is clear that DECL is actually
2270 import_export_decl (tree decl)
2275 tree class_type = NULL_TREE;
2277 if (DECL_INTERFACE_KNOWN (decl))
2280 /* We cannot determine what linkage to give to an entity with vague
2281 linkage until the end of the file. For example, a virtual table
2282 for a class will be defined if and only if the key method is
2283 defined in this translation unit. As a further example, consider
2284 that when compiling a translation unit that uses PCH file with
2285 "-frepo" it would be incorrect to make decisions about what
2286 entities to emit when building the PCH; those decisions must be
2287 delayed until the repository information has been processed. */
2288 gcc_assert (at_eof);
2289 /* Object file linkage for explicit instantiations is handled in
2290 mark_decl_instantiated. For static variables in functions with
2291 vague linkage, maybe_commonize_var is used.
2293 Therefore, the only declarations that should be provided to this
2294 function are those with external linkage that are:
2296 * implicit instantiations of function templates
2300 * implicit instantiations of static data members of class
2307 Furthermore, all entities that reach this point must have a
2308 definition available in this translation unit.
2310 The following assertions check these conditions. */
2311 gcc_assert (TREE_CODE (decl) == FUNCTION_DECL
2312 || TREE_CODE (decl) == VAR_DECL);
2313 /* Any code that creates entities with TREE_PUBLIC cleared should
2314 also set DECL_INTERFACE_KNOWN. */
2315 gcc_assert (TREE_PUBLIC (decl));
2316 if (TREE_CODE (decl) == FUNCTION_DECL)
2317 gcc_assert (DECL_IMPLICIT_INSTANTIATION (decl)
2318 || DECL_FRIEND_PSEUDO_TEMPLATE_INSTANTIATION (decl)
2319 || DECL_DECLARED_INLINE_P (decl));
2321 gcc_assert (DECL_IMPLICIT_INSTANTIATION (decl)
2322 || DECL_VTABLE_OR_VTT_P (decl)
2323 || DECL_TINFO_P (decl));
2324 /* Check that a definition of DECL is available in this translation
2326 gcc_assert (!DECL_REALLY_EXTERN (decl));
2328 /* Assume that DECL will not have COMDAT linkage. */
2330 /* Assume that DECL will not be imported into this translation
2334 /* See if the repository tells us whether or not to emit DECL in
2335 this translation unit. */
2336 emit_p = repo_emit_p (decl);
2339 else if (emit_p == 1)
2341 /* The repository indicates that this entity should be defined
2342 here. Make sure the back end honors that request. */
2343 if (TREE_CODE (decl) == VAR_DECL)
2345 else if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (decl)
2346 || DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P (decl))
2349 FOR_EACH_CLONE (clone, decl)
2350 mark_needed (clone);
2354 /* Output the definition as an ordinary strong definition. */
2355 DECL_EXTERNAL (decl) = 0;
2356 DECL_INTERFACE_KNOWN (decl) = 1;
2361 /* We have already decided what to do with this DECL; there is no
2362 need to check anything further. */
2364 else if (TREE_CODE (decl) == VAR_DECL && DECL_VTABLE_OR_VTT_P (decl))
2366 class_type = DECL_CONTEXT (decl);
2367 import_export_class (class_type);
2368 if (TYPE_FOR_JAVA (class_type))
2370 else if (CLASSTYPE_INTERFACE_KNOWN (class_type)
2371 && CLASSTYPE_INTERFACE_ONLY (class_type))
2373 else if ((!flag_weak || TARGET_WEAK_NOT_IN_ARCHIVE_TOC)
2374 && !CLASSTYPE_USE_TEMPLATE (class_type)
2375 && CLASSTYPE_KEY_METHOD (class_type)
2376 && !DECL_DECLARED_INLINE_P (CLASSTYPE_KEY_METHOD (class_type)))
2377 /* The ABI requires that all virtual tables be emitted with
2378 COMDAT linkage. However, on systems where COMDAT symbols
2379 don't show up in the table of contents for a static
2380 archive, or on systems without weak symbols (where we
2381 approximate COMDAT linkage by using internal linkage), the
2382 linker will report errors about undefined symbols because
2383 it will not see the virtual table definition. Therefore,
2384 in the case that we know that the virtual table will be
2385 emitted in only one translation unit, we make the virtual
2386 table an ordinary definition with external linkage. */
2387 DECL_EXTERNAL (decl) = 0;
2388 else if (CLASSTYPE_INTERFACE_KNOWN (class_type))
2390 /* CLASS_TYPE is being exported from this translation unit,
2391 so DECL should be defined here. */
2392 if (!flag_weak && CLASSTYPE_EXPLICIT_INSTANTIATION (class_type))
2393 /* If a class is declared in a header with the "extern
2394 template" extension, then it will not be instantiated,
2395 even in translation units that would normally require
2396 it. Often such classes are explicitly instantiated in
2397 one translation unit. Therefore, the explicit
2398 instantiation must be made visible to other translation
2400 DECL_EXTERNAL (decl) = 0;
2403 /* The generic C++ ABI says that class data is always
2404 COMDAT, even if there is a key function. Some
2405 variants (e.g., the ARM EABI) says that class data
2406 only has COMDAT linkage if the class data might be
2407 emitted in more than one translation unit. When the
2408 key method can be inline and is inline, we still have
2409 to arrange for comdat even though
2410 class_data_always_comdat is false. */
2411 if (!CLASSTYPE_KEY_METHOD (class_type)
2412 || DECL_DECLARED_INLINE_P (CLASSTYPE_KEY_METHOD (class_type))
2413 || targetm.cxx.class_data_always_comdat ())
2415 /* The ABI requires COMDAT linkage. Normally, we
2416 only emit COMDAT things when they are needed;
2417 make sure that we realize that this entity is
2424 else if (!flag_implicit_templates
2425 && CLASSTYPE_IMPLICIT_INSTANTIATION (class_type))
2430 else if (TREE_CODE (decl) == VAR_DECL && DECL_TINFO_P (decl))
2432 tree type = TREE_TYPE (DECL_NAME (decl));
2433 if (CLASS_TYPE_P (type))
2436 import_export_class (type);
2437 if (CLASSTYPE_INTERFACE_KNOWN (type)
2438 && TYPE_POLYMORPHIC_P (type)
2439 && CLASSTYPE_INTERFACE_ONLY (type)
2440 /* If -fno-rtti was specified, then we cannot be sure
2441 that RTTI information will be emitted with the
2442 virtual table of the class, so we must emit it
2443 wherever it is used. */
2448 if (CLASSTYPE_INTERFACE_KNOWN (type)
2449 && !CLASSTYPE_INTERFACE_ONLY (type))
2451 comdat_p = (targetm.cxx.class_data_always_comdat ()
2452 || (CLASSTYPE_KEY_METHOD (type)
2453 && DECL_DECLARED_INLINE_P (CLASSTYPE_KEY_METHOD (type))));
2458 DECL_EXTERNAL (decl) = 0;
2468 else if (DECL_TEMPLATE_INSTANTIATION (decl)
2469 || DECL_FRIEND_PSEUDO_TEMPLATE_INSTANTIATION (decl))
2471 /* DECL is an implicit instantiation of a function or static
2473 if ((flag_implicit_templates
2474 && !flag_use_repository)
2475 || (flag_implicit_inline_templates
2476 && TREE_CODE (decl) == FUNCTION_DECL
2477 && DECL_DECLARED_INLINE_P (decl)))
2480 /* If we are not implicitly generating templates, then mark
2481 this entity as undefined in this translation unit. */
2484 else if (DECL_FUNCTION_MEMBER_P (decl))
2486 if (!DECL_DECLARED_INLINE_P (decl))
2488 tree ctype = DECL_CONTEXT (decl);
2489 import_export_class (ctype);
2490 if (CLASSTYPE_INTERFACE_KNOWN (ctype))
2492 DECL_NOT_REALLY_EXTERN (decl)
2493 = ! (CLASSTYPE_INTERFACE_ONLY (ctype)
2494 || (DECL_DECLARED_INLINE_P (decl)
2495 && ! flag_implement_inlines
2496 && !DECL_VINDEX (decl)));
2498 if (!DECL_NOT_REALLY_EXTERN (decl))
2499 DECL_EXTERNAL (decl) = 1;
2501 /* Always make artificials weak. */
2502 if (DECL_ARTIFICIAL (decl) && flag_weak)
2505 maybe_make_one_only (decl);
2516 /* If we are importing DECL into this translation unit, mark is
2517 an undefined here. */
2518 DECL_EXTERNAL (decl) = 1;
2519 DECL_NOT_REALLY_EXTERN (decl) = 0;
2523 /* If we decided to put DECL in COMDAT, mark it accordingly at
2525 comdat_linkage (decl);
2528 DECL_INTERFACE_KNOWN (decl) = 1;
2531 /* Return an expression that performs the destruction of DECL, which
2532 must be a VAR_DECL whose type has a non-trivial destructor, or is
2533 an array whose (innermost) elements have a non-trivial destructor. */
2536 build_cleanup (tree decl)
2539 tree type = TREE_TYPE (decl);
2541 /* This function should only be called for declarations that really
2542 require cleanups. */
2543 gcc_assert (!TYPE_HAS_TRIVIAL_DESTRUCTOR (type));
2545 /* Treat all objects with destructors as used; the destructor may do
2546 something substantive. */
2549 if (TREE_CODE (type) == ARRAY_TYPE)
2552 temp = build_address (decl);
2553 temp = build_delete (TREE_TYPE (temp), temp,
2554 sfk_complete_destructor,
2555 LOOKUP_NORMAL|LOOKUP_NONVIRTUAL|LOOKUP_DESTRUCTOR, 0);
2559 /* Returns the initialization guard variable for the variable DECL,
2560 which has static storage duration. */
2563 get_guard (tree decl)
2568 sname = mangle_guard_variable (decl);
2569 guard = IDENTIFIER_GLOBAL_VALUE (sname);
2574 /* We use a type that is big enough to contain a mutex as well
2575 as an integer counter. */
2576 guard_type = targetm.cxx.guard_type ();
2577 guard = build_decl (DECL_SOURCE_LOCATION (decl),
2578 VAR_DECL, sname, guard_type);
2580 /* The guard should have the same linkage as what it guards. */
2581 TREE_PUBLIC (guard) = TREE_PUBLIC (decl);
2582 TREE_STATIC (guard) = TREE_STATIC (decl);
2583 DECL_COMMON (guard) = DECL_COMMON (decl);
2584 DECL_COMDAT (guard) = DECL_COMDAT (decl);
2585 if (DECL_ONE_ONLY (decl))
2586 make_decl_one_only (guard, cxx_comdat_group (guard));
2587 if (TREE_PUBLIC (decl))
2588 DECL_WEAK (guard) = DECL_WEAK (decl);
2589 DECL_VISIBILITY (guard) = DECL_VISIBILITY (decl);
2590 DECL_VISIBILITY_SPECIFIED (guard) = DECL_VISIBILITY_SPECIFIED (decl);
2592 DECL_ARTIFICIAL (guard) = 1;
2593 DECL_IGNORED_P (guard) = 1;
2594 TREE_USED (guard) = 1;
2595 pushdecl_top_level_and_finish (guard, NULL_TREE);
2600 /* Return those bits of the GUARD variable that should be set when the
2601 guarded entity is actually initialized. */
2604 get_guard_bits (tree guard)
2606 if (!targetm.cxx.guard_mask_bit ())
2608 /* We only set the first byte of the guard, in order to leave room
2609 for a mutex in the high-order bits. */
2610 guard = build1 (ADDR_EXPR,
2611 build_pointer_type (TREE_TYPE (guard)),
2613 guard = build1 (NOP_EXPR,
2614 build_pointer_type (char_type_node),
2616 guard = build1 (INDIRECT_REF, char_type_node, guard);
2622 /* Return an expression which determines whether or not the GUARD
2623 variable has already been initialized. */
2626 get_guard_cond (tree guard)
2630 /* Check to see if the GUARD is zero. */
2631 guard = get_guard_bits (guard);
2633 /* Mask off all but the low bit. */
2634 if (targetm.cxx.guard_mask_bit ())
2636 guard_value = integer_one_node;
2637 if (!same_type_p (TREE_TYPE (guard_value), TREE_TYPE (guard)))
2638 guard_value = convert (TREE_TYPE (guard), guard_value);
2639 guard = cp_build_binary_op (input_location,
2640 BIT_AND_EXPR, guard, guard_value,
2641 tf_warning_or_error);
2644 guard_value = integer_zero_node;
2645 if (!same_type_p (TREE_TYPE (guard_value), TREE_TYPE (guard)))
2646 guard_value = convert (TREE_TYPE (guard), guard_value);
2647 return cp_build_binary_op (input_location,
2648 EQ_EXPR, guard, guard_value,
2649 tf_warning_or_error);
2652 /* Return an expression which sets the GUARD variable, indicating that
2653 the variable being guarded has been initialized. */
2656 set_guard (tree guard)
2660 /* Set the GUARD to one. */
2661 guard = get_guard_bits (guard);
2662 guard_init = integer_one_node;
2663 if (!same_type_p (TREE_TYPE (guard_init), TREE_TYPE (guard)))
2664 guard_init = convert (TREE_TYPE (guard), guard_init);
2665 return cp_build_modify_expr (guard, NOP_EXPR, guard_init,
2666 tf_warning_or_error);
2669 /* Start the process of running a particular set of global constructors
2670 or destructors. Subroutine of do_[cd]tors. */
2673 start_objects (int method_type, int initp)
2679 /* Make ctor or dtor function. METHOD_TYPE may be 'I' or 'D'. */
2681 if (initp != DEFAULT_INIT_PRIORITY)
2691 sprintf (type, "%c%c%.5u", method_type, joiner, initp);
2694 sprintf (type, "%c", method_type);
2696 fndecl = build_lang_decl (FUNCTION_DECL,
2697 get_file_function_name (type),
2698 build_function_type (void_type_node,
2700 start_preparsed_function (fndecl, /*attrs=*/NULL_TREE, SF_PRE_PARSED);
2702 TREE_PUBLIC (current_function_decl) = 0;
2704 /* Mark as artificial because it's not explicitly in the user's
2706 DECL_ARTIFICIAL (current_function_decl) = 1;
2708 /* Mark this declaration as used to avoid spurious warnings. */
2709 TREE_USED (current_function_decl) = 1;
2711 /* Mark this function as a global constructor or destructor. */
2712 if (method_type == 'I')
2713 DECL_GLOBAL_CTOR_P (current_function_decl) = 1;
2715 DECL_GLOBAL_DTOR_P (current_function_decl) = 1;
2717 body = begin_compound_stmt (BCS_FN_BODY);
2722 /* Finish the process of running a particular set of global constructors
2723 or destructors. Subroutine of do_[cd]tors. */
2726 finish_objects (int method_type, int initp, tree body)
2731 finish_compound_stmt (body);
2732 fn = finish_function (0);
2734 if (method_type == 'I')
2736 DECL_STATIC_CONSTRUCTOR (fn) = 1;
2737 decl_init_priority_insert (fn, initp);
2741 DECL_STATIC_DESTRUCTOR (fn) = 1;
2742 decl_fini_priority_insert (fn, initp);
2745 expand_or_defer_fn (fn);
2748 /* The names of the parameters to the function created to handle
2749 initializations and destructions for objects with static storage
2751 #define INITIALIZE_P_IDENTIFIER "__initialize_p"
2752 #define PRIORITY_IDENTIFIER "__priority"
2754 /* The name of the function we create to handle initializations and
2755 destructions for objects with static storage duration. */
2756 #define SSDF_IDENTIFIER "__static_initialization_and_destruction"
2758 /* The declaration for the __INITIALIZE_P argument. */
2759 static GTY(()) tree initialize_p_decl;
2761 /* The declaration for the __PRIORITY argument. */
2762 static GTY(()) tree priority_decl;
2764 /* The declaration for the static storage duration function. */
2765 static GTY(()) tree ssdf_decl;
2767 /* All the static storage duration functions created in this
2768 translation unit. */
2769 static GTY(()) VEC(tree,gc) *ssdf_decls;
2771 /* A map from priority levels to information about that priority
2772 level. There may be many such levels, so efficient lookup is
2774 static splay_tree priority_info_map;
2776 /* Begins the generation of the function that will handle all
2777 initialization and destruction of objects with static storage
2778 duration. The function generated takes two parameters of type
2779 `int': __INITIALIZE_P and __PRIORITY. If __INITIALIZE_P is
2780 nonzero, it performs initializations. Otherwise, it performs
2781 destructions. It only performs those initializations or
2782 destructions with the indicated __PRIORITY. The generated function
2785 It is assumed that this function will only be called once per
2786 translation unit. */
2789 start_static_storage_duration_function (unsigned count)
2794 char id[sizeof (SSDF_IDENTIFIER) + 1 /* '\0' */ + 32];
2796 /* Create the identifier for this function. It will be of the form
2797 SSDF_IDENTIFIER_<number>. */
2798 sprintf (id, "%s_%u", SSDF_IDENTIFIER, count);
2800 /* Create the parameters. */
2801 parm_types = void_list_node;
2802 parm_types = tree_cons (NULL_TREE, integer_type_node, parm_types);
2803 parm_types = tree_cons (NULL_TREE, integer_type_node, parm_types);
2804 type = build_function_type (void_type_node, parm_types);
2806 /* Create the FUNCTION_DECL itself. */
2807 ssdf_decl = build_lang_decl (FUNCTION_DECL,
2808 get_identifier (id),
2810 TREE_PUBLIC (ssdf_decl) = 0;
2811 DECL_ARTIFICIAL (ssdf_decl) = 1;
2813 /* Put this function in the list of functions to be called from the
2814 static constructors and destructors. */
2817 ssdf_decls = VEC_alloc (tree, gc, 32);
2819 /* Take this opportunity to initialize the map from priority
2820 numbers to information about that priority level. */
2821 priority_info_map = splay_tree_new (splay_tree_compare_ints,
2822 /*delete_key_fn=*/0,
2823 /*delete_value_fn=*/
2824 (splay_tree_delete_value_fn) &free);
2826 /* We always need to generate functions for the
2827 DEFAULT_INIT_PRIORITY so enter it now. That way when we walk
2828 priorities later, we'll be sure to find the
2829 DEFAULT_INIT_PRIORITY. */
2830 get_priority_info (DEFAULT_INIT_PRIORITY);
2833 VEC_safe_push (tree, gc, ssdf_decls, ssdf_decl);
2835 /* Create the argument list. */
2836 initialize_p_decl = cp_build_parm_decl
2837 (get_identifier (INITIALIZE_P_IDENTIFIER), integer_type_node);
2838 DECL_CONTEXT (initialize_p_decl) = ssdf_decl;
2839 TREE_USED (initialize_p_decl) = 1;
2840 priority_decl = cp_build_parm_decl
2841 (get_identifier (PRIORITY_IDENTIFIER), integer_type_node);
2842 DECL_CONTEXT (priority_decl) = ssdf_decl;
2843 TREE_USED (priority_decl) = 1;
2845 TREE_CHAIN (initialize_p_decl) = priority_decl;
2846 DECL_ARGUMENTS (ssdf_decl) = initialize_p_decl;
2848 /* Put the function in the global scope. */
2849 pushdecl (ssdf_decl);
2851 /* Start the function itself. This is equivalent to declaring the
2854 static void __ssdf (int __initialize_p, init __priority_p);
2856 It is static because we only need to call this function from the
2857 various constructor and destructor functions for this module. */
2858 start_preparsed_function (ssdf_decl,
2859 /*attrs=*/NULL_TREE,
2862 /* Set up the scope of the outermost block in the function. */
2863 body = begin_compound_stmt (BCS_FN_BODY);
2868 /* Finish the generation of the function which performs initialization
2869 and destruction of objects with static storage duration. After
2870 this point, no more such objects can be created. */
2873 finish_static_storage_duration_function (tree body)
2875 /* Close out the function. */
2876 finish_compound_stmt (body);
2877 expand_or_defer_fn (finish_function (0));
2880 /* Return the information about the indicated PRIORITY level. If no
2881 code to handle this level has yet been generated, generate the
2882 appropriate prologue. */
2884 static priority_info
2885 get_priority_info (int priority)
2890 n = splay_tree_lookup (priority_info_map,
2891 (splay_tree_key) priority);
2894 /* Create a new priority information structure, and insert it
2896 pi = XNEW (struct priority_info_s);
2897 pi->initializations_p = 0;
2898 pi->destructions_p = 0;
2899 splay_tree_insert (priority_info_map,
2900 (splay_tree_key) priority,
2901 (splay_tree_value) pi);
2904 pi = (priority_info) n->value;
2909 /* The effective initialization priority of a DECL. */
2911 #define DECL_EFFECTIVE_INIT_PRIORITY(decl) \
2912 ((!DECL_HAS_INIT_PRIORITY_P (decl) || DECL_INIT_PRIORITY (decl) == 0) \
2913 ? DEFAULT_INIT_PRIORITY : DECL_INIT_PRIORITY (decl))
2915 /* Whether a DECL needs a guard to protect it against multiple
2918 #define NEEDS_GUARD_P(decl) (TREE_PUBLIC (decl) && (DECL_COMMON (decl) \
2919 || DECL_ONE_ONLY (decl) \
2920 || DECL_WEAK (decl)))
2922 /* Called from one_static_initialization_or_destruction(),
2924 Walks the initializer list of a global variable and looks for
2925 temporary variables (DECL_NAME() == NULL and DECL_ARTIFICIAL != 0)
2926 and that have their DECL_CONTEXT() == NULL.
2927 For each such temporary variable, set their DECL_CONTEXT() to
2928 the current function. This is necessary because otherwise
2929 some optimizers (enabled by -O2 -fprofile-arcs) might crash
2930 when trying to refer to a temporary variable that does not have
2931 it's DECL_CONTECT() properly set. */
2933 fix_temporary_vars_context_r (tree *node,
2934 int *unused ATTRIBUTE_UNUSED,
2935 void *unused1 ATTRIBUTE_UNUSED)
2937 gcc_assert (current_function_decl);
2939 if (TREE_CODE (*node) == BIND_EXPR)
2943 for (var = BIND_EXPR_VARS (*node); var; var = TREE_CHAIN (var))
2944 if (TREE_CODE (var) == VAR_DECL
2946 && DECL_ARTIFICIAL (var)
2947 && !DECL_CONTEXT (var))
2948 DECL_CONTEXT (var) = current_function_decl;
2954 /* Set up to handle the initialization or destruction of DECL. If
2955 INITP is nonzero, we are initializing the variable. Otherwise, we
2956 are destroying it. */
2959 one_static_initialization_or_destruction (tree decl, tree init, bool initp)
2961 tree guard_if_stmt = NULL_TREE;
2964 /* If we are supposed to destruct and there's a trivial destructor,
2965 nothing has to be done. */
2967 && TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
2970 /* Trick the compiler into thinking we are at the file and line
2971 where DECL was declared so that error-messages make sense, and so
2972 that the debugger will show somewhat sensible file and line
2974 input_location = DECL_SOURCE_LOCATION (decl);
2976 /* Make sure temporary variables in the initialiser all have
2977 their DECL_CONTEXT() set to a value different from NULL_TREE.
2978 This can happen when global variables initialisers are built.
2979 In that case, the DECL_CONTEXT() of the global variables _AND_ of all
2980 the temporary variables that might have been generated in the
2981 accompagning initialisers is NULL_TREE, meaning the variables have been
2982 declared in the global namespace.
2983 What we want to do here is to fix that and make sure the DECL_CONTEXT()
2984 of the temporaries are set to the current function decl. */
2985 cp_walk_tree_without_duplicates (&init,
2986 fix_temporary_vars_context_r,
2993 Access control for implicit calls to the constructors,
2994 the conversion functions, or the destructor called to
2995 create and destroy a static data member is performed as
2996 if these calls appeared in the scope of the member's
2999 we pretend we are in a static member function of the class of
3000 which the DECL is a member. */
3001 if (member_p (decl))
3003 DECL_CONTEXT (current_function_decl) = DECL_CONTEXT (decl);
3004 DECL_STATIC_FUNCTION_P (current_function_decl) = 1;
3007 /* Assume we don't need a guard. */
3009 /* We need a guard if this is an object with external linkage that
3010 might be initialized in more than one place. (For example, a
3011 static data member of a template, when the data member requires
3013 if (NEEDS_GUARD_P (decl))
3017 guard = get_guard (decl);
3019 /* When using __cxa_atexit, we just check the GUARD as we would
3020 for a local static. */
3021 if (flag_use_cxa_atexit)
3023 /* When using __cxa_atexit, we never try to destroy
3024 anything from a static destructor. */
3026 guard_cond = get_guard_cond (guard);
3028 /* If we don't have __cxa_atexit, then we will be running
3029 destructors from .fini sections, or their equivalents. So,
3030 we need to know how many times we've tried to initialize this
3031 object. We do initializations only if the GUARD is zero,
3032 i.e., if we are the first to initialize the variable. We do
3033 destructions only if the GUARD is one, i.e., if we are the
3034 last to destroy the variable. */
3037 = cp_build_binary_op (input_location,
3039 cp_build_unary_op (PREINCREMENT_EXPR,
3042 tf_warning_or_error),
3044 tf_warning_or_error);
3047 = cp_build_binary_op (input_location,
3049 cp_build_unary_op (PREDECREMENT_EXPR,
3052 tf_warning_or_error),
3054 tf_warning_or_error);
3056 guard_if_stmt = begin_if_stmt ();
3057 finish_if_stmt_cond (guard_cond, guard_if_stmt);
3061 /* If we're using __cxa_atexit, we have not already set the GUARD,
3062 so we must do so now. */
3063 if (guard && initp && flag_use_cxa_atexit)
3064 finish_expr_stmt (set_guard (guard));
3066 /* Perform the initialization or destruction. */
3070 finish_expr_stmt (init);
3072 /* If we're using __cxa_atexit, register a function that calls the
3073 destructor for the object. */
3074 if (flag_use_cxa_atexit)
3075 finish_expr_stmt (register_dtor_fn (decl));
3078 finish_expr_stmt (build_cleanup (decl));
3080 /* Finish the guard if-stmt, if necessary. */
3083 finish_then_clause (guard_if_stmt);
3084 finish_if_stmt (guard_if_stmt);
3087 /* Now that we're done with DECL we don't need to pretend to be a
3088 member of its class any longer. */
3089 DECL_CONTEXT (current_function_decl) = NULL_TREE;
3090 DECL_STATIC_FUNCTION_P (current_function_decl) = 0;
3093 /* Generate code to do the initialization or destruction of the decls in VARS,
3094 a TREE_LIST of VAR_DECL with static storage duration.
3095 Whether initialization or destruction is performed is specified by INITP. */
3098 do_static_initialization_or_destruction (tree vars, bool initp)
3100 tree node, init_if_stmt, cond;
3102 /* Build the outer if-stmt to check for initialization or destruction. */
3103 init_if_stmt = begin_if_stmt ();
3104 cond = initp ? integer_one_node : integer_zero_node;
3105 cond = cp_build_binary_op (input_location,
3109 tf_warning_or_error);
3110 finish_if_stmt_cond (cond, init_if_stmt);
3114 tree decl = TREE_VALUE (node);
3115 tree priority_if_stmt;
3119 /* If we don't need a destructor, there's nothing to do. Avoid
3120 creating a possibly empty if-stmt. */
3121 if (!initp && TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
3123 node = TREE_CHAIN (node);
3127 /* Remember that we had an initialization or finalization at this
3129 priority = DECL_EFFECTIVE_INIT_PRIORITY (decl);
3130 pi = get_priority_info (priority);
3132 pi->initializations_p = 1;
3134 pi->destructions_p = 1;
3136 /* Conditionalize this initialization on being in the right priority
3137 and being initializing/finalizing appropriately. */
3138 priority_if_stmt = begin_if_stmt ();
3139 cond = cp_build_binary_op (input_location,
3142 build_int_cst (NULL_TREE, priority),
3143 tf_warning_or_error);
3144 finish_if_stmt_cond (cond, priority_if_stmt);
3146 /* Process initializers with same priority. */
3148 && DECL_EFFECTIVE_INIT_PRIORITY (TREE_VALUE (node)) == priority;
3149 node = TREE_CHAIN (node))
3150 /* Do one initialization or destruction. */
3151 one_static_initialization_or_destruction (TREE_VALUE (node),
3152 TREE_PURPOSE (node), initp);
3154 /* Finish up the priority if-stmt body. */
3155 finish_then_clause (priority_if_stmt);
3156 finish_if_stmt (priority_if_stmt);
3160 /* Finish up the init/destruct if-stmt body. */
3161 finish_then_clause (init_if_stmt);
3162 finish_if_stmt (init_if_stmt);
3165 /* VARS is a list of variables with static storage duration which may
3166 need initialization and/or finalization. Remove those variables
3167 that don't really need to be initialized or finalized, and return
3168 the resulting list. The order in which the variables appear in
3169 VARS is in reverse order of the order in which they should actually
3170 be initialized. The list we return is in the unreversed order;
3171 i.e., the first variable should be initialized first. */
3174 prune_vars_needing_no_initialization (tree *vars)
3177 tree result = NULL_TREE;
3182 tree decl = TREE_VALUE (t);
3183 tree init = TREE_PURPOSE (t);
3185 /* Deal gracefully with error. */
3186 if (decl == error_mark_node)
3188 var = &TREE_CHAIN (t);
3192 /* The only things that can be initialized are variables. */
3193 gcc_assert (TREE_CODE (decl) == VAR_DECL);
3195 /* If this object is not defined, we don't need to do anything
3197 if (DECL_EXTERNAL (decl))
3199 var = &TREE_CHAIN (t);
3203 /* Also, if the initializer already contains errors, we can bail
3205 if (init && TREE_CODE (init) == TREE_LIST
3206 && value_member (error_mark_node, init))
3208 var = &TREE_CHAIN (t);
3212 /* This variable is going to need initialization and/or
3213 finalization, so we add it to the list. */
3214 *var = TREE_CHAIN (t);
3215 TREE_CHAIN (t) = result;
3222 /* Make sure we have told the back end about all the variables in
3226 write_out_vars (tree vars)
3230 for (v = vars; v; v = TREE_CHAIN (v))
3232 tree var = TREE_VALUE (v);
3233 if (!var_finalized_p (var))
3235 import_export_decl (var);
3236 rest_of_decl_compilation (var, 1, 1);
3241 /* Generate a static constructor (if CONSTRUCTOR_P) or destructor
3242 (otherwise) that will initialize all global objects with static
3243 storage duration having the indicated PRIORITY. */
3246 generate_ctor_or_dtor_function (bool constructor_p, int priority,
3255 input_location = *locus;
3257 /* Was: locus->line++; */
3259 /* We use `I' to indicate initialization and `D' to indicate
3261 function_key = constructor_p ? 'I' : 'D';
3263 /* We emit the function lazily, to avoid generating empty
3264 global constructors and destructors. */
3267 /* For Objective-C++, we may need to initialize metadata found in this module.
3268 This must be done _before_ any other static initializations. */
3269 if (c_dialect_objc () && (priority == DEFAULT_INIT_PRIORITY)
3270 && constructor_p && objc_static_init_needed_p ())
3272 body = start_objects (function_key, priority);
3273 objc_generate_static_init_call (NULL_TREE);
3276 /* Call the static storage duration function with appropriate
3278 for (i = 0; VEC_iterate (tree, ssdf_decls, i, fndecl); ++i)
3280 /* Calls to pure or const functions will expand to nothing. */
3281 if (! (flags_from_decl_or_type (fndecl) & (ECF_CONST | ECF_PURE)))
3284 body = start_objects (function_key, priority);
3286 arguments = tree_cons (NULL_TREE,
3287 build_int_cst (NULL_TREE, priority),
3289 arguments = tree_cons (NULL_TREE,
3290 build_int_cst (NULL_TREE, constructor_p),
3292 finish_expr_stmt (cp_build_function_call (fndecl, arguments,
3293 tf_warning_or_error));
3297 /* Close out the function. */
3299 finish_objects (function_key, priority, body);
3302 /* Generate constructor and destructor functions for the priority
3306 generate_ctor_and_dtor_functions_for_priority (splay_tree_node n, void * data)
3308 location_t *locus = (location_t *) data;
3309 int priority = (int) n->key;
3310 priority_info pi = (priority_info) n->value;
3312 /* Generate the functions themselves, but only if they are really
3314 if (pi->initializations_p)
3315 generate_ctor_or_dtor_function (/*constructor_p=*/true, priority, locus);
3316 if (pi->destructions_p)
3317 generate_ctor_or_dtor_function (/*constructor_p=*/false, priority, locus);
3319 /* Keep iterating. */
3323 /* Called via LANGHOOK_CALLGRAPH_ANALYZE_EXPR. It is supposed to mark
3324 decls referenced from front-end specific constructs; it will be called
3325 only for language-specific tree nodes.
3327 Here we must deal with member pointers. */
3330 cxx_callgraph_analyze_expr (tree *tp, int *walk_subtrees ATTRIBUTE_UNUSED)
3334 switch (TREE_CODE (t))
3337 if (TYPE_PTRMEMFUNC_P (TREE_TYPE (t)))
3338 cgraph_mark_address_taken_node (cgraph_node (PTRMEM_CST_MEMBER (t)));
3341 if (TREE_CODE (BASELINK_FUNCTIONS (t)) == FUNCTION_DECL)
3342 cgraph_mark_address_taken_node (cgraph_node (BASELINK_FUNCTIONS (t)));
3345 if (DECL_VTABLE_OR_VTT_P (t))
3347 /* The ABI requires that all virtual tables be emitted
3348 whenever one of them is. */
3350 for (vtbl = CLASSTYPE_VTABLES (DECL_CONTEXT (t));
3352 vtbl = TREE_CHAIN (vtbl))
3353 mark_decl_referenced (vtbl);
3355 else if (DECL_CONTEXT (t)
3356 && flag_use_repository
3357 && TREE_CODE (DECL_CONTEXT (t)) == FUNCTION_DECL)
3358 /* If we need a static variable in a function, then we
3359 need the containing function. */
3360 mark_decl_referenced (DECL_CONTEXT (t));
3369 /* Java requires that we be able to reference a local address for a
3370 method, and not be confused by PLT entries. If hidden aliases are
3371 supported, collect and return all the functions for which we should
3372 emit a hidden alias. */
3374 static struct pointer_set_t *
3375 collect_candidates_for_java_method_aliases (void)
3377 struct cgraph_node *node;
3378 struct pointer_set_t *candidates = NULL;
3380 #ifndef HAVE_GAS_HIDDEN
3384 for (node = cgraph_nodes; node ; node = node->next)
3386 tree fndecl = node->decl;
3388 if (DECL_CONTEXT (fndecl)
3389 && TYPE_P (DECL_CONTEXT (fndecl))
3390 && TYPE_FOR_JAVA (DECL_CONTEXT (fndecl))
3391 && TARGET_USE_LOCAL_THUNK_ALIAS_P (fndecl))
3393 if (candidates == NULL)
3394 candidates = pointer_set_create ();
3395 pointer_set_insert (candidates, fndecl);
3403 /* Java requires that we be able to reference a local address for a
3404 method, and not be confused by PLT entries. If hidden aliases are
3405 supported, emit one for each java function that we've emitted.
3406 CANDIDATES is the set of FUNCTION_DECLs that were gathered
3407 by collect_candidates_for_java_method_aliases. */
3410 build_java_method_aliases (struct pointer_set_t *candidates)
3412 struct cgraph_node *node;
3414 #ifndef HAVE_GAS_HIDDEN
3418 for (node = cgraph_nodes; node ; node = node->next)
3420 tree fndecl = node->decl;
3422 if (TREE_ASM_WRITTEN (fndecl)
3423 && pointer_set_contains (candidates, fndecl))
3425 /* Mangle the name in a predictable way; we need to reference
3426 this from a java compiled object file. */
3427 tree oid, nid, alias;
3431 oid = DECL_ASSEMBLER_NAME (fndecl);
3432 oname = IDENTIFIER_POINTER (oid);
3433 gcc_assert (oname[0] == '_' && oname[1] == 'Z');
3434 nname = ACONCAT (("_ZGA", oname+2, NULL));
3435 nid = get_identifier (nname);
3437 alias = make_alias_for (fndecl, nid);
3438 TREE_PUBLIC (alias) = 1;
3439 DECL_VISIBILITY (alias) = VISIBILITY_HIDDEN;
3441 assemble_alias (alias, oid);
3446 /* Returns true iff there is a definition available for variable or
3450 decl_defined_p (tree decl)
3452 if (TREE_CODE (decl) == FUNCTION_DECL)
3453 return (DECL_INITIAL (decl) != NULL_TREE);
3456 gcc_assert (TREE_CODE (decl) == VAR_DECL);
3457 return !DECL_EXTERNAL (decl);
3461 /* Complain that DECL uses a type with no linkage but is never defined. */
3464 no_linkage_error (tree decl)
3466 tree t = no_linkage_check (TREE_TYPE (decl), /*relaxed_p=*/false);
3467 if (TYPE_ANONYMOUS_P (t))
3469 permerror (0, "%q+#D, declared using anonymous type, "
3470 "is used but never defined", decl);
3471 if (is_typedef_decl (TYPE_NAME (t)))
3472 permerror (0, "%q+#D does not refer to the unqualified type, "
3473 "so it is not used for linkage", TYPE_NAME (t));
3476 permerror (0, "%q+#D, declared using local type %qT, "
3477 "is used but never defined", decl, t);
3480 /* This routine is called at the end of compilation.
3481 Its job is to create all the code needed to initialize and
3482 destroy the global aggregates. We do the destruction
3483 first, since that way we only need to reverse the decls once. */
3486 cp_write_global_declarations (void)
3492 unsigned ssdf_count = 0;
3495 struct pointer_set_t *candidates;
3497 locus = input_location;
3500 /* Bad parse errors. Just forget about it. */
3501 if (! global_bindings_p () || current_class_type || decl_namespace_list)
3505 c_common_write_pch ();
3507 /* FIXME - huh? was input_line -= 1;*/
3509 /* We now have to write out all the stuff we put off writing out.
3512 o Template specializations that we have not yet instantiated,
3513 but which are needed.
3514 o Initialization and destruction for non-local objects with
3515 static storage duration. (Local objects with static storage
3516 duration are initialized when their scope is first entered,
3517 and are cleaned up via atexit.)
3518 o Virtual function tables.
3520 All of these may cause others to be needed. For example,
3521 instantiating one function may cause another to be needed, and
3522 generating the initializer for an object may cause templates to be
3523 instantiated, etc., etc. */
3525 timevar_push (TV_VARCONST);
3527 emit_support_tinfos ();
3536 /* If there are templates that we've put off instantiating, do
3538 instantiate_pending_templates (retries);
3541 /* Write out virtual tables as required. Note that writing out
3542 the virtual table for a template class may cause the
3543 instantiation of members of that class. If we write out
3544 vtables then we remove the class from our list so we don't
3545 have to look at it again. */
3547 while (keyed_classes != NULL_TREE
3548 && maybe_emit_vtables (TREE_VALUE (keyed_classes)))
3551 keyed_classes = TREE_CHAIN (keyed_classes);
3557 tree next = TREE_CHAIN (t);
3561 if (maybe_emit_vtables (TREE_VALUE (next)))
3564 TREE_CHAIN (t) = TREE_CHAIN (next);
3569 next = TREE_CHAIN (t);
3573 /* Write out needed type info variables. We have to be careful
3574 looping through unemitted decls, because emit_tinfo_decl may
3575 cause other variables to be needed. New elements will be
3576 appended, and we remove from the vector those that actually
3578 for (i = VEC_length (tree, unemitted_tinfo_decls);
3579 VEC_iterate (tree, unemitted_tinfo_decls, --i, t);)
3580 if (emit_tinfo_decl (t))
3583 VEC_unordered_remove (tree, unemitted_tinfo_decls, i);
3586 /* The list of objects with static storage duration is built up
3587 in reverse order. We clear STATIC_AGGREGATES so that any new
3588 aggregates added during the initialization of these will be
3589 initialized in the correct order when we next come around the
3591 vars = prune_vars_needing_no_initialization (&static_aggregates);
3595 /* We need to start a new initialization function each time
3596 through the loop. That's because we need to know which
3597 vtables have been referenced, and TREE_SYMBOL_REFERENCED
3598 isn't computed until a function is finished, and written
3599 out. That's a deficiency in the back end. When this is
3600 fixed, these initialization functions could all become
3601 inline, with resulting performance improvements. */
3604 /* Set the line and file, so that it is obviously not from
3606 input_location = locus;
3607 ssdf_body = start_static_storage_duration_function (ssdf_count);
3609 /* Make sure the back end knows about all the variables. */
3610 write_out_vars (vars);
3612 /* First generate code to do all the initializations. */
3614 do_static_initialization_or_destruction (vars, /*initp=*/true);
3616 /* Then, generate code to do all the destructions. Do these
3617 in reverse order so that the most recently constructed
3618 variable is the first destroyed. If we're using
3619 __cxa_atexit, then we don't need to do this; functions
3620 were registered at initialization time to destroy the
3622 if (!flag_use_cxa_atexit && vars)
3624 vars = nreverse (vars);
3625 do_static_initialization_or_destruction (vars, /*initp=*/false);
3630 /* Finish up the static storage duration function for this
3632 input_location = locus;
3633 finish_static_storage_duration_function (ssdf_body);
3635 /* All those initializations and finalizations might cause
3636 us to need more inline functions, more template
3637 instantiations, etc. */
3640 /* ??? was: locus.line++; */
3643 /* Go through the set of inline functions whose bodies have not
3644 been emitted yet. If out-of-line copies of these functions
3645 are required, emit them. */
3646 for (i = 0; VEC_iterate (tree, deferred_fns, i, decl); ++i)
3648 /* Does it need synthesizing? */
3649 if (DECL_DEFAULTED_FN (decl) && ! DECL_INITIAL (decl)
3650 && (! DECL_REALLY_EXTERN (decl) || possibly_inlined_p (decl)))
3652 /* Even though we're already at the top-level, we push
3653 there again. That way, when we pop back a few lines
3654 hence, all of our state is restored. Otherwise,
3655 finish_function doesn't clean things up, and we end
3656 up with CURRENT_FUNCTION_DECL set. */
3657 push_to_top_level ();
3658 /* The decl's location will mark where it was first
3659 needed. Save that so synthesize method can indicate
3660 where it was needed from, in case of error */
3661 input_location = DECL_SOURCE_LOCATION (decl);
3662 synthesize_method (decl);
3663 pop_from_top_level ();
3667 if (!DECL_SAVED_TREE (decl))
3670 /* We lie to the back end, pretending that some functions
3671 are not defined when they really are. This keeps these
3672 functions from being put out unnecessarily. But, we must
3673 stop lying when the functions are referenced, or if they
3674 are not comdat since they need to be put out now. If
3675 DECL_INTERFACE_KNOWN, then we have already set
3676 DECL_EXTERNAL appropriately, so there's no need to check
3677 again, and we do not want to clear DECL_EXTERNAL if a
3678 previous call to import_export_decl set it.
3680 This is done in a separate for cycle, because if some
3681 deferred function is contained in another deferred
3682 function later in deferred_fns varray,
3683 rest_of_compilation would skip this function and we
3684 really cannot expand the same function twice. */
3685 import_export_decl (decl);
3686 if (DECL_NOT_REALLY_EXTERN (decl)
3687 && DECL_INITIAL (decl)
3688 && decl_needed_p (decl))
3690 struct cgraph_node *node = cgraph_get_node (decl), *alias, *next;
3692 DECL_EXTERNAL (decl) = 0;
3693 /* If we mark !DECL_EXTERNAL one of the same body aliases,
3694 we need to mark all of them that way. */
3695 if (node && node->same_body)
3697 DECL_EXTERNAL (node->decl) = 0;
3698 for (alias = node->same_body; alias; alias = alias->next)
3699 DECL_EXTERNAL (alias->decl) = 0;
3701 /* If we mark !DECL_EXTERNAL one of the symbols in some comdat
3702 group, we need to mark all symbols in the same comdat group
3704 if (node->same_comdat_group)
3705 for (next = node->same_comdat_group;
3707 next = next->same_comdat_group)
3709 DECL_EXTERNAL (next->decl) = 0;
3710 if (next->same_body)
3712 for (alias = next->same_body;
3714 alias = alias->next)
3715 DECL_EXTERNAL (alias->decl) = 0;
3720 /* If we're going to need to write this function out, and
3721 there's already a body for it, create RTL for it now.
3722 (There might be no body if this is a method we haven't
3723 gotten around to synthesizing yet.) */
3724 if (!DECL_EXTERNAL (decl)
3725 && decl_needed_p (decl)
3726 && !TREE_ASM_WRITTEN (decl)
3727 && !cgraph_node (decl)->local.finalized)
3729 /* We will output the function; no longer consider it in this
3731 DECL_DEFER_OUTPUT (decl) = 0;
3732 /* Generate RTL for this function now that we know we
3734 expand_or_defer_fn (decl);
3735 /* If we're compiling -fsyntax-only pretend that this
3736 function has been written out so that we don't try to
3738 if (flag_syntax_only)
3739 TREE_ASM_WRITTEN (decl) = 1;
3744 if (walk_namespaces (wrapup_globals_for_namespace, /*data=*/0))
3747 /* Static data members are just like namespace-scope globals. */
3748 for (i = 0; VEC_iterate (tree, pending_statics, i, decl); ++i)
3750 if (var_finalized_p (decl) || DECL_REALLY_EXTERN (decl)
3751 /* Don't write it out if we haven't seen a definition. */
3752 || DECL_IN_AGGR_P (decl))
3754 import_export_decl (decl);
3755 /* If this static data member is needed, provide it to the
3757 if (DECL_NOT_REALLY_EXTERN (decl) && decl_needed_p (decl))
3758 DECL_EXTERNAL (decl) = 0;
3760 if (VEC_length (tree, pending_statics) != 0
3761 && wrapup_global_declarations (VEC_address (tree, pending_statics),
3762 VEC_length (tree, pending_statics)))
3769 /* All used inline functions must have a definition at this point. */
3770 for (i = 0; VEC_iterate (tree, deferred_fns, i, decl); ++i)
3772 if (/* Check online inline functions that were actually used. */
3773 DECL_ODR_USED (decl) && DECL_DECLARED_INLINE_P (decl)
3774 /* If the definition actually was available here, then the
3775 fact that the function was not defined merely represents
3776 that for some reason (use of a template repository,
3777 #pragma interface, etc.) we decided not to emit the
3779 && !DECL_INITIAL (decl)
3780 /* An explicit instantiation can be used to specify
3781 that the body is in another unit. It will have
3782 already verified there was a definition. */
3783 && !DECL_EXPLICIT_INSTANTIATION (decl))
3785 warning (0, "inline function %q+D used but never defined", decl);
3786 /* Avoid a duplicate warning from check_global_declaration_1. */
3787 TREE_NO_WARNING (decl) = 1;
3791 /* So must decls that use a type with no linkage. */
3792 for (i = 0; VEC_iterate (tree, no_linkage_decls, i, decl); ++i)
3793 if (!decl_defined_p (decl))
3794 no_linkage_error (decl);
3796 /* We give C linkage to static constructors and destructors. */
3797 push_lang_context (lang_name_c);
3799 /* Generate initialization and destruction functions for all
3800 priorities for which they are required. */
3801 if (priority_info_map)
3802 splay_tree_foreach (priority_info_map,
3803 generate_ctor_and_dtor_functions_for_priority,
3805 else if (c_dialect_objc () && objc_static_init_needed_p ())
3806 /* If this is obj-c++ and we need a static init, call
3807 generate_ctor_or_dtor_function. */
3808 generate_ctor_or_dtor_function (/*constructor_p=*/true,
3809 DEFAULT_INIT_PRIORITY, &locus);
3811 /* We're done with the splay-tree now. */
3812 if (priority_info_map)
3813 splay_tree_delete (priority_info_map);
3815 /* Generate any missing aliases. */
3816 maybe_apply_pending_pragma_weaks ();
3818 /* We're done with static constructors, so we can go back to "C++"
3820 pop_lang_context ();
3822 /* Collect candidates for Java hidden aliases. */
3823 candidates = collect_candidates_for_java_method_aliases ();
3825 cgraph_finalize_compilation_unit ();
3827 /* Now, issue warnings about static, but not defined, functions,
3828 etc., and emit debugging information. */
3829 walk_namespaces (wrapup_globals_for_namespace, /*data=*/&reconsider);
3830 if (VEC_length (tree, pending_statics) != 0)
3832 check_global_declarations (VEC_address (tree, pending_statics),
3833 VEC_length (tree, pending_statics));
3834 emit_debug_global_declarations (VEC_address (tree, pending_statics),
3835 VEC_length (tree, pending_statics));
3838 /* Generate hidden aliases for Java. */
3841 build_java_method_aliases (candidates);
3842 pointer_set_destroy (candidates);
3847 /* The entire file is now complete. If requested, dump everything
3851 FILE *stream = dump_begin (TDI_tu, &flags);
3855 dump_node (global_namespace, flags & ~TDF_SLIM, stream);
3856 dump_end (TDI_tu, stream);
3860 timevar_pop (TV_VARCONST);
3862 if (flag_detailed_statistics)
3864 dump_tree_statistics ();
3865 dump_time_statistics ();
3867 input_location = locus;
3869 #ifdef ENABLE_CHECKING
3870 validate_conversion_obstack ();
3871 #endif /* ENABLE_CHECKING */
3874 /* FN is an OFFSET_REF, DOTSTAR_EXPR or MEMBER_REF indicating the
3875 function to call in parse-tree form; it has not yet been
3876 semantically analyzed. ARGS are the arguments to the function.
3877 They have already been semantically analyzed. This may change
3881 build_offset_ref_call_from_tree (tree fn, VEC(tree,gc) **args)
3884 VEC(tree,gc) *orig_args = NULL;
3889 object = TREE_OPERAND (fn, 0);
3891 if (processing_template_decl)
3893 gcc_assert (TREE_CODE (fn) == DOTSTAR_EXPR
3894 || TREE_CODE (fn) == MEMBER_REF);
3895 if (type_dependent_expression_p (fn)
3896 || any_type_dependent_arguments_p (*args))
3897 return build_nt_call_vec (fn, *args);
3899 orig_args = make_tree_vector_copy (*args);
3901 /* Transform the arguments and add the implicit "this"
3902 parameter. That must be done before the FN is transformed
3903 because we depend on the form of FN. */
3904 make_args_non_dependent (*args);
3905 object = build_non_dependent_expr (object);
3906 if (TREE_CODE (fn) == DOTSTAR_EXPR)
3907 object = cp_build_unary_op (ADDR_EXPR, object, 0, tf_warning_or_error);
3908 VEC_safe_insert (tree, gc, *args, 0, object);
3909 /* Now that the arguments are done, transform FN. */
3910 fn = build_non_dependent_expr (fn);
3913 /* A qualified name corresponding to a bound pointer-to-member is
3914 represented as an OFFSET_REF:
3916 struct B { void g(); };
3918 void B::g() { (this->*p)(); } */
3919 if (TREE_CODE (fn) == OFFSET_REF)
3921 tree object_addr = cp_build_unary_op (ADDR_EXPR, object, 0,
3922 tf_warning_or_error);
3923 fn = TREE_OPERAND (fn, 1);
3924 fn = get_member_function_from_ptrfunc (&object_addr, fn);
3925 VEC_safe_insert (tree, gc, *args, 0, object_addr);
3928 expr = cp_build_function_call_vec (fn, args, tf_warning_or_error);
3929 if (processing_template_decl && expr != error_mark_node)
3930 expr = build_min_non_dep_call_vec (expr, orig_fn, orig_args);
3932 if (orig_args != NULL)
3933 release_tree_vector (orig_args);
3940 check_default_args (tree x)
3942 tree arg = TYPE_ARG_TYPES (TREE_TYPE (x));
3943 bool saw_def = false;
3944 int i = 0 - (TREE_CODE (TREE_TYPE (x)) == METHOD_TYPE);
3945 for (; arg && arg != void_list_node; arg = TREE_CHAIN (arg), ++i)
3947 if (TREE_PURPOSE (arg))
3951 error ("default argument missing for parameter %P of %q+#D", i, x);
3952 TREE_PURPOSE (arg) = error_mark_node;
3957 /* Return true if function DECL can be inlined. This is used to force
3958 instantiation of methods that might be interesting for inlining. */
3960 possibly_inlined_p (tree decl)
3962 gcc_assert (TREE_CODE (decl) == FUNCTION_DECL);
3963 if (DECL_UNINLINABLE (decl))
3965 if (!optimize || pragma_java_exceptions)
3966 return DECL_DECLARED_INLINE_P (decl);
3967 /* When optimizing, we might inline everything when flatten
3968 attribute or heuristics inlining for size or autoinlining
3973 /* Mark DECL (either a _DECL or a BASELINK) as "used" in the program.
3974 If DECL is a specialization or implicitly declared class member,
3975 generate the actual definition. */
3978 mark_used (tree decl)
3980 HOST_WIDE_INT saved_processing_template_decl = 0;
3982 /* If DECL is a BASELINK for a single function, then treat it just
3983 like the DECL for the function. Otherwise, if the BASELINK is
3984 for an overloaded function, we don't know which function was
3985 actually used until after overload resolution. */
3986 if (TREE_CODE (decl) == BASELINK)
3988 decl = BASELINK_FUNCTIONS (decl);
3989 if (really_overloaded_fn (decl))
3991 decl = OVL_CURRENT (decl);
3994 /* Set TREE_USED for the benefit of -Wunused. */
3995 TREE_USED (decl) = 1;
3996 if (DECL_CLONED_FUNCTION_P (decl))
3997 TREE_USED (DECL_CLONED_FUNCTION (decl)) = 1;
3999 if (TREE_CODE (decl) == FUNCTION_DECL
4000 && DECL_DELETED_FN (decl))
4002 error ("deleted function %q+D", decl);
4003 error ("used here");
4006 /* If we don't need a value, then we don't need to synthesize DECL. */
4007 if (cp_unevaluated_operand != 0)
4010 /* We can only check DECL_ODR_USED on variables or functions with
4011 DECL_LANG_SPECIFIC set, and these are also the only decls that we
4012 might need special handling for. */
4013 if ((TREE_CODE (decl) != VAR_DECL && TREE_CODE (decl) != FUNCTION_DECL)
4014 || DECL_LANG_SPECIFIC (decl) == NULL
4015 || DECL_THUNK_P (decl))
4018 /* We only want to do this processing once. We don't need to keep trying
4019 to instantiate inline templates, because unit-at-a-time will make sure
4020 we get them compiled before functions that want to inline them. */
4021 if (DECL_ODR_USED (decl))
4024 /* If within finish_function, defer the rest until that function
4025 finishes, otherwise it might recurse. */
4026 if (defer_mark_used_calls)
4028 VEC_safe_push (tree, gc, deferred_mark_used_calls, decl);
4032 /* Normally, we can wait until instantiation-time to synthesize
4033 DECL. However, if DECL is a static data member initialized with
4034 a constant, we need the value right now because a reference to
4035 such a data member is not value-dependent. */
4036 if (TREE_CODE (decl) == VAR_DECL
4037 && DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl)
4038 && DECL_CLASS_SCOPE_P (decl))
4040 /* Don't try to instantiate members of dependent types. We
4041 cannot just use dependent_type_p here because this function
4042 may be called from fold_non_dependent_expr, and then we may
4043 see dependent types, even though processing_template_decl
4045 if (CLASSTYPE_TEMPLATE_INFO ((DECL_CONTEXT (decl)))
4046 && uses_template_parms (CLASSTYPE_TI_ARGS (DECL_CONTEXT (decl))))
4048 /* Pretend that we are not in a template, even if we are, so
4049 that the static data member initializer will be processed. */
4050 saved_processing_template_decl = processing_template_decl;
4051 processing_template_decl = 0;
4054 if (processing_template_decl)
4057 DECL_ODR_USED (decl) = 1;
4058 if (DECL_CLONED_FUNCTION_P (decl))
4059 DECL_ODR_USED (DECL_CLONED_FUNCTION (decl)) = 1;
4061 /* DR 757: A type without linkage shall not be used as the type of a
4062 variable or function with linkage, unless
4063 o the variable or function has extern "C" linkage (7.5 [dcl.link]), or
4064 o the variable or function is not used (3.2 [basic.def.odr]) or is
4065 defined in the same translation unit. */
4066 if (cxx_dialect > cxx98
4067 && decl_linkage (decl) != lk_none
4068 && !DECL_EXTERN_C_P (decl)
4069 && !DECL_ARTIFICIAL (decl)
4070 && !decl_defined_p (decl)
4071 && no_linkage_check (TREE_TYPE (decl), /*relaxed_p=*/false))
4073 if (is_local_extern (decl))
4074 /* There's no way to define a local extern, and adding it to
4075 the vector interferes with GC, so give an error now. */
4076 no_linkage_error (decl);
4078 VEC_safe_push (tree, gc, no_linkage_decls, decl);
4081 if (TREE_CODE (decl) == FUNCTION_DECL && DECL_DECLARED_INLINE_P (decl)
4082 && !DECL_INITIAL (decl) && !DECL_ARTIFICIAL (decl))
4083 /* Remember it, so we can check it was defined. */
4084 note_vague_linkage_fn (decl);
4086 /* Is it a synthesized method that needs to be synthesized? */
4087 if (TREE_CODE (decl) == FUNCTION_DECL
4088 && DECL_NONSTATIC_MEMBER_FUNCTION_P (decl)
4089 && DECL_DEFAULTED_FN (decl)
4090 && ! DECL_INITIAL (decl))
4092 /* Remember the current location for a function we will end up
4093 synthesizing. Then we can inform the user where it was
4094 required in the case of error. */
4095 DECL_SOURCE_LOCATION (decl) = input_location;
4097 /* Synthesizing an implicitly defined member function will result in
4098 garbage collection. We must treat this situation as if we were
4099 within the body of a function so as to avoid collecting live data
4100 on the stack (such as overload resolution candidates).
4102 We could just let cp_write_global_declarations handle synthesizing
4103 this function, since we just added it to deferred_fns, but doing
4104 it at the use site produces better error messages. */
4106 synthesize_method (decl);
4108 /* If this is a synthesized method we don't need to
4109 do the instantiation test below. */
4111 else if ((TREE_CODE (decl) == FUNCTION_DECL || TREE_CODE (decl) == VAR_DECL)
4112 && DECL_TEMPLATE_INFO (decl)
4113 && (!DECL_EXPLICIT_INSTANTIATION (decl)
4114 || always_instantiate_p (decl)))
4115 /* If this is a function or variable that is an instance of some
4116 template, we now know that we will need to actually do the
4117 instantiation. We check that DECL is not an explicit
4118 instantiation because that is not checked in instantiate_decl.
4120 We put off instantiating functions in order to improve compile
4121 times. Maintaining a stack of active functions is expensive,
4122 and the inliner knows to instantiate any functions it might
4123 need. Therefore, we always try to defer instantiation. */
4124 instantiate_decl (decl, /*defer_ok=*/true,
4125 /*expl_inst_class_mem_p=*/false);
4127 processing_template_decl = saved_processing_template_decl;
4130 #include "gt-cp-decl2.h"