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)
158 newtype = build_function_type (new_ret, args);
159 newtype = apply_memfn_quals (newtype, type_memfn_quals (fntype));
162 newtype = build_method_type_directly
163 (TREE_TYPE (TREE_VALUE (TYPE_ARG_TYPES (fntype))),
164 new_ret, TREE_CHAIN (args));
166 newtype = build_exception_variant (newtype, raises);
168 newtype = cp_build_type_attribute_variant (newtype, attrs);
173 /* Build a PARM_DECL with NAME and TYPE, and set DECL_ARG_TYPE
177 cp_build_parm_decl (tree name, tree type)
179 tree parm = build_decl (input_location,
180 PARM_DECL, name, type);
181 /* DECL_ARG_TYPE is only used by the back end and the back end never
183 if (!processing_template_decl)
184 DECL_ARG_TYPE (parm) = type_passed_as (type);
186 /* If the type is a pack expansion, then we have a function
188 if (type && TREE_CODE (type) == TYPE_PACK_EXPANSION)
189 FUNCTION_PARAMETER_PACK_P (parm) = 1;
194 /* Returns a PARM_DECL for a parameter of the indicated TYPE, with the
198 build_artificial_parm (tree name, tree type)
200 tree parm = cp_build_parm_decl (name, type);
201 DECL_ARTIFICIAL (parm) = 1;
202 /* All our artificial parms are implicitly `const'; they cannot be
204 TREE_READONLY (parm) = 1;
208 /* Constructors for types with virtual baseclasses need an "in-charge" flag
209 saying whether this constructor is responsible for initialization of
210 virtual baseclasses or not. All destructors also need this "in-charge"
211 flag, which additionally determines whether or not the destructor should
212 free the memory for the object.
214 This function adds the "in-charge" flag to member function FN if
215 appropriate. It is called from grokclassfn and tsubst.
216 FN must be either a constructor or destructor.
218 The in-charge flag follows the 'this' parameter, and is followed by the
219 VTT parm (if any), then the user-written parms. */
222 maybe_retrofit_in_chrg (tree fn)
224 tree basetype, arg_types, parms, parm, fntype;
226 /* If we've already add the in-charge parameter don't do it again. */
227 if (DECL_HAS_IN_CHARGE_PARM_P (fn))
230 /* When processing templates we can't know, in general, whether or
231 not we're going to have virtual baseclasses. */
232 if (processing_template_decl)
235 /* We don't need an in-charge parameter for constructors that don't
236 have virtual bases. */
237 if (DECL_CONSTRUCTOR_P (fn)
238 && !CLASSTYPE_VBASECLASSES (DECL_CONTEXT (fn)))
241 arg_types = TYPE_ARG_TYPES (TREE_TYPE (fn));
242 basetype = TREE_TYPE (TREE_VALUE (arg_types));
243 arg_types = TREE_CHAIN (arg_types);
245 parms = TREE_CHAIN (DECL_ARGUMENTS (fn));
247 /* If this is a subobject constructor or destructor, our caller will
248 pass us a pointer to our VTT. */
249 if (CLASSTYPE_VBASECLASSES (DECL_CONTEXT (fn)))
251 parm = build_artificial_parm (vtt_parm_identifier, vtt_parm_type);
253 /* First add it to DECL_ARGUMENTS between 'this' and the real args... */
254 TREE_CHAIN (parm) = parms;
257 /* ...and then to TYPE_ARG_TYPES. */
258 arg_types = hash_tree_chain (vtt_parm_type, arg_types);
260 DECL_HAS_VTT_PARM_P (fn) = 1;
263 /* Then add the in-charge parm (before the VTT parm). */
264 parm = build_artificial_parm (in_charge_identifier, integer_type_node);
265 TREE_CHAIN (parm) = parms;
267 arg_types = hash_tree_chain (integer_type_node, arg_types);
269 /* Insert our new parameter(s) into the list. */
270 TREE_CHAIN (DECL_ARGUMENTS (fn)) = parms;
272 /* And rebuild the function type. */
273 fntype = build_method_type_directly (basetype, TREE_TYPE (TREE_TYPE (fn)),
275 if (TYPE_RAISES_EXCEPTIONS (TREE_TYPE (fn)))
276 fntype = build_exception_variant (fntype,
277 TYPE_RAISES_EXCEPTIONS (TREE_TYPE (fn)));
278 if (TYPE_ATTRIBUTES (TREE_TYPE (fn)))
279 fntype = (cp_build_type_attribute_variant
280 (fntype, TYPE_ATTRIBUTES (TREE_TYPE (fn))));
281 TREE_TYPE (fn) = fntype;
283 /* Now we've got the in-charge parameter. */
284 DECL_HAS_IN_CHARGE_PARM_P (fn) = 1;
287 /* Classes overload their constituent function names automatically.
288 When a function name is declared in a record structure,
289 its name is changed to it overloaded name. Since names for
290 constructors and destructors can conflict, we place a leading
293 CNAME is the name of the class we are grokking for.
295 FUNCTION is a FUNCTION_DECL. It was created by `grokdeclarator'.
297 FLAGS contains bits saying what's special about today's
298 arguments. DTOR_FLAG == DESTRUCTOR.
300 If FUNCTION is a destructor, then we must add the `auto-delete' field
301 as a second parameter. There is some hair associated with the fact
302 that we must "declare" this variable in the manner consistent with the
303 way the rest of the arguments were declared.
305 QUALS are the qualifiers for the this pointer. */
308 grokclassfn (tree ctype, tree function, enum overload_flags flags)
310 tree fn_name = DECL_NAME (function);
312 /* Even within an `extern "C"' block, members get C++ linkage. See
313 [dcl.link] for details. */
314 SET_DECL_LANGUAGE (function, lang_cplusplus);
316 if (fn_name == NULL_TREE)
318 error ("name missing for member function");
319 fn_name = get_identifier ("<anonymous>");
320 DECL_NAME (function) = fn_name;
323 DECL_CONTEXT (function) = ctype;
325 if (flags == DTOR_FLAG)
326 DECL_DESTRUCTOR_P (function) = 1;
328 if (flags == DTOR_FLAG || DECL_CONSTRUCTOR_P (function))
329 maybe_retrofit_in_chrg (function);
332 /* Create an ARRAY_REF, checking for the user doing things backwards
336 grok_array_decl (tree array_expr, tree index_exp)
340 tree orig_array_expr = array_expr;
341 tree orig_index_exp = index_exp;
343 if (error_operand_p (array_expr) || error_operand_p (index_exp))
344 return error_mark_node;
346 if (processing_template_decl)
348 if (type_dependent_expression_p (array_expr)
349 || type_dependent_expression_p (index_exp))
350 return build_min_nt (ARRAY_REF, array_expr, index_exp,
351 NULL_TREE, NULL_TREE);
352 array_expr = build_non_dependent_expr (array_expr);
353 index_exp = build_non_dependent_expr (index_exp);
356 type = TREE_TYPE (array_expr);
358 type = non_reference (type);
360 /* If they have an `operator[]', use that. */
361 if (MAYBE_CLASS_TYPE_P (type) || MAYBE_CLASS_TYPE_P (TREE_TYPE (index_exp)))
362 expr = build_new_op (ARRAY_REF, LOOKUP_NORMAL,
363 array_expr, index_exp, NULL_TREE,
364 /*overloaded_p=*/NULL, tf_warning_or_error);
369 /* Otherwise, create an ARRAY_REF for a pointer or array type.
370 It is a little-known fact that, if `a' is an array and `i' is
371 an int, you can write `i[a]', which means the same thing as
373 if (TREE_CODE (type) == ARRAY_TYPE)
376 p1 = build_expr_type_conversion (WANT_POINTER, array_expr, false);
378 if (TREE_CODE (TREE_TYPE (index_exp)) == ARRAY_TYPE)
381 p2 = build_expr_type_conversion (WANT_POINTER, index_exp, false);
383 i1 = build_expr_type_conversion (WANT_INT | WANT_ENUM, array_expr,
385 i2 = build_expr_type_conversion (WANT_INT | WANT_ENUM, index_exp,
388 if ((p1 && i2) && (i1 && p2))
389 error ("ambiguous conversion for array subscript");
392 array_expr = p1, index_exp = i2;
394 array_expr = p2, index_exp = i1;
397 error ("invalid types %<%T[%T]%> for array subscript",
398 type, TREE_TYPE (index_exp));
399 return error_mark_node;
402 if (array_expr == error_mark_node || index_exp == error_mark_node)
403 error ("ambiguous conversion for array subscript");
405 expr = build_array_ref (input_location, array_expr, index_exp);
407 if (processing_template_decl && expr != error_mark_node)
408 return build_min_non_dep (ARRAY_REF, expr, orig_array_expr, orig_index_exp,
409 NULL_TREE, NULL_TREE);
413 /* Given the cast expression EXP, checking out its validity. Either return
414 an error_mark_node if there was an unavoidable error, return a cast to
415 void for trying to delete a pointer w/ the value 0, or return the
416 call to delete. If DOING_VEC is true, we handle things differently
417 for doing an array delete.
418 Implements ARM $5.3.4. This is called from the parser. */
421 delete_sanity (tree exp, tree size, bool doing_vec, int use_global_delete)
425 if (exp == error_mark_node)
428 if (processing_template_decl)
430 t = build_min (DELETE_EXPR, void_type_node, exp, size);
431 DELETE_EXPR_USE_GLOBAL (t) = use_global_delete;
432 DELETE_EXPR_USE_VEC (t) = doing_vec;
433 TREE_SIDE_EFFECTS (t) = 1;
437 /* An array can't have been allocated by new, so complain. */
438 if (TREE_CODE (exp) == VAR_DECL
439 && TREE_CODE (TREE_TYPE (exp)) == ARRAY_TYPE)
440 warning (0, "deleting array %q#D", exp);
442 t = build_expr_type_conversion (WANT_POINTER, exp, true);
444 if (t == NULL_TREE || t == error_mark_node)
446 error ("type %q#T argument given to %<delete%>, expected pointer",
448 return error_mark_node;
451 type = TREE_TYPE (t);
453 /* As of Valley Forge, you can delete a pointer to const. */
455 /* You can't delete functions. */
456 if (TREE_CODE (TREE_TYPE (type)) == FUNCTION_TYPE)
458 error ("cannot delete a function. Only pointer-to-objects are "
459 "valid arguments to %<delete%>");
460 return error_mark_node;
463 /* Deleting ptr to void is undefined behavior [expr.delete/3]. */
464 if (TREE_CODE (TREE_TYPE (type)) == VOID_TYPE)
466 warning (0, "deleting %qT is undefined", type);
470 /* Deleting a pointer with the value zero is valid and has no effect. */
471 if (integer_zerop (t))
472 return build1 (NOP_EXPR, void_type_node, t);
475 return build_vec_delete (t, /*maxindex=*/NULL_TREE,
476 sfk_deleting_destructor,
479 return build_delete (type, t, sfk_deleting_destructor,
480 LOOKUP_NORMAL, use_global_delete);
483 /* Report an error if the indicated template declaration is not the
484 sort of thing that should be a member template. */
487 check_member_template (tree tmpl)
491 gcc_assert (TREE_CODE (tmpl) == TEMPLATE_DECL);
492 decl = DECL_TEMPLATE_RESULT (tmpl);
494 if (TREE_CODE (decl) == FUNCTION_DECL
495 || (TREE_CODE (decl) == TYPE_DECL
496 && MAYBE_CLASS_TYPE_P (TREE_TYPE (decl))))
498 /* The parser rejects template declarations in local classes. */
499 gcc_assert (!current_function_decl);
500 /* The parser rejects any use of virtual in a function template. */
501 gcc_assert (!(TREE_CODE (decl) == FUNCTION_DECL
502 && DECL_VIRTUAL_P (decl)));
504 /* The debug-information generating code doesn't know what to do
505 with member templates. */
506 DECL_IGNORED_P (tmpl) = 1;
509 error ("template declaration of %q#D", decl);
512 /* Return true iff TYPE is a valid Java parameter or return type. */
515 acceptable_java_type (tree type)
517 if (type == error_mark_node)
520 if (TREE_CODE (type) == VOID_TYPE || TYPE_FOR_JAVA (type))
522 if (TREE_CODE (type) == POINTER_TYPE || TREE_CODE (type) == REFERENCE_TYPE)
524 type = TREE_TYPE (type);
525 if (TREE_CODE (type) == RECORD_TYPE)
528 if (! TYPE_FOR_JAVA (type))
530 if (! CLASSTYPE_TEMPLATE_INFO (type))
532 args = CLASSTYPE_TI_ARGS (type);
533 i = TREE_VEC_LENGTH (args);
536 type = TREE_VEC_ELT (args, i);
537 if (TREE_CODE (type) == POINTER_TYPE)
538 type = TREE_TYPE (type);
539 if (! TYPE_FOR_JAVA (type))
548 /* For a METHOD in a Java class CTYPE, return true if
549 the parameter and return types are valid Java types.
550 Otherwise, print appropriate error messages, and return false. */
553 check_java_method (tree method)
556 tree arg_types = TYPE_ARG_TYPES (TREE_TYPE (method));
557 tree ret_type = TREE_TYPE (TREE_TYPE (method));
559 if (!acceptable_java_type (ret_type))
561 error ("Java method %qD has non-Java return type %qT",
566 arg_types = TREE_CHAIN (arg_types);
567 if (DECL_HAS_IN_CHARGE_PARM_P (method))
568 arg_types = TREE_CHAIN (arg_types);
569 if (DECL_HAS_VTT_PARM_P (method))
570 arg_types = TREE_CHAIN (arg_types);
572 for (; arg_types != NULL_TREE; arg_types = TREE_CHAIN (arg_types))
574 tree type = TREE_VALUE (arg_types);
575 if (!acceptable_java_type (type))
577 if (type != error_mark_node)
578 error ("Java method %qD has non-Java parameter type %qT",
586 /* Sanity check: report error if this function FUNCTION is not
587 really a member of the class (CTYPE) it is supposed to belong to.
588 TEMPLATE_PARMS is used to specify the template parameters of a member
589 template passed as FUNCTION_DECL. If the member template is passed as a
590 TEMPLATE_DECL, it can be NULL since the parameters can be extracted
591 from the declaration. If the function is not a function template, it
593 It returns the original declaration for the function, NULL_TREE if
594 no declaration was found, error_mark_node if an error was emitted. */
597 check_classfn (tree ctype, tree function, tree template_parms)
603 if (DECL_USE_TEMPLATE (function)
604 && !(TREE_CODE (function) == TEMPLATE_DECL
605 && DECL_TEMPLATE_SPECIALIZATION (function))
606 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (function)))
607 /* Since this is a specialization of a member template,
608 we're not going to find the declaration in the class.
611 struct S { template <typename T> void f(T); };
612 template <> void S::f(int);
614 we're not going to find `S::f(int)', but there's no
615 reason we should, either. We let our callers know we didn't
616 find the method, but we don't complain. */
619 /* Basic sanity check: for a template function, the template parameters
620 either were not passed, or they are the same of DECL_TEMPLATE_PARMS. */
621 if (TREE_CODE (function) == TEMPLATE_DECL)
624 && !comp_template_parms (template_parms,
625 DECL_TEMPLATE_PARMS (function)))
627 error ("template parameter lists provided don't match the "
628 "template parameters of %qD", function);
629 return error_mark_node;
631 template_parms = DECL_TEMPLATE_PARMS (function);
634 /* OK, is this a definition of a member template? */
635 is_template = (template_parms != NULL_TREE);
637 /* We must enter the scope here, because conversion operators are
638 named by target type, and type equivalence relies on typenames
639 resolving within the scope of CTYPE. */
640 pushed_scope = push_scope (ctype);
641 ix = class_method_index_for_fn (complete_type (ctype), function);
644 VEC(tree,gc) *methods = CLASSTYPE_METHOD_VEC (ctype);
645 tree fndecls, fndecl = 0;
647 const char *format = NULL;
649 for (fndecls = VEC_index (tree, methods, ix);
650 fndecls; fndecls = OVL_NEXT (fndecls))
654 fndecl = OVL_CURRENT (fndecls);
655 p1 = TYPE_ARG_TYPES (TREE_TYPE (function));
656 p2 = TYPE_ARG_TYPES (TREE_TYPE (fndecl));
658 /* We cannot simply call decls_match because this doesn't
659 work for static member functions that are pretending to
660 be methods, and because the name may have been changed by
663 /* Get rid of the this parameter on functions that become
665 if (DECL_STATIC_FUNCTION_P (fndecl)
666 && TREE_CODE (TREE_TYPE (function)) == METHOD_TYPE)
667 p1 = TREE_CHAIN (p1);
669 /* A member template definition only matches a member template
671 if (is_template != (TREE_CODE (fndecl) == TEMPLATE_DECL))
674 if (same_type_p (TREE_TYPE (TREE_TYPE (function)),
675 TREE_TYPE (TREE_TYPE (fndecl)))
676 && compparms (p1, p2)
678 || comp_template_parms (template_parms,
679 DECL_TEMPLATE_PARMS (fndecl)))
680 && (DECL_TEMPLATE_SPECIALIZATION (function)
681 == DECL_TEMPLATE_SPECIALIZATION (fndecl))
682 && (!DECL_TEMPLATE_SPECIALIZATION (function)
683 || (DECL_TI_TEMPLATE (function)
684 == DECL_TI_TEMPLATE (fndecl))))
690 pop_scope (pushed_scope);
691 return OVL_CURRENT (fndecls);
694 error_at (DECL_SOURCE_LOCATION (function),
695 "prototype for %q#D does not match any in class %qT",
697 is_conv_op = DECL_CONV_FN_P (fndecl);
700 ix = CLASSTYPE_FIRST_CONVERSION_SLOT;
701 fndecls = VEC_index (tree, methods, ix);
704 fndecl = OVL_CURRENT (fndecls);
705 fndecls = OVL_NEXT (fndecls);
707 if (!fndecls && is_conv_op)
709 if (VEC_length (tree, methods) > (size_t) ++ix)
711 fndecls = VEC_index (tree, methods, ix);
712 if (!DECL_CONV_FN_P (OVL_CURRENT (fndecls)))
724 format = N_("candidates are: %+#D");
726 format = N_("candidate is: %+#D");
727 error (format, fndecl);
730 else if (!COMPLETE_TYPE_P (ctype))
731 cxx_incomplete_type_error (function, ctype);
733 error ("no %q#D member function declared in class %qT",
737 pop_scope (pushed_scope);
738 return error_mark_node;
741 /* DECL is a function with vague linkage. Remember it so that at the
742 end of the translation unit we can decide whether or not to emit
746 note_vague_linkage_fn (tree decl)
748 DECL_DEFER_OUTPUT (decl) = 1;
749 VEC_safe_push (tree, gc, deferred_fns, decl);
752 /* We have just processed the DECL, which is a static data member.
753 The other parameters are as for cp_finish_decl. */
756 finish_static_data_member_decl (tree decl,
757 tree init, bool init_const_expr_p,
761 DECL_CONTEXT (decl) = current_class_type;
763 /* We cannot call pushdecl here, because that would fill in the
764 TREE_CHAIN of our decl. Instead, we modify cp_finish_decl to do
765 the right thing, namely, to put this decl out straight away. */
767 if (! processing_template_decl)
768 VEC_safe_push (tree, gc, pending_statics, decl);
770 if (LOCAL_CLASS_P (current_class_type))
771 permerror (input_location, "local class %q#T shall not have static data member %q#D",
772 current_class_type, decl);
774 /* Static consts need not be initialized in the class definition. */
775 if (init != NULL_TREE && TYPE_NEEDS_CONSTRUCTING (TREE_TYPE (decl)))
777 static int explained = 0;
779 error ("initializer invalid for static member with constructor");
782 error ("(an out of class initialization is required)");
788 DECL_INITIAL (decl) = init;
789 DECL_IN_AGGR_P (decl) = 1;
791 if (TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE
792 && TYPE_DOMAIN (TREE_TYPE (decl)) == NULL_TREE)
793 SET_VAR_HAD_UNKNOWN_BOUND (decl);
795 cp_finish_decl (decl, init, init_const_expr_p, asmspec_tree, flags);
798 /* DECLARATOR and DECLSPECS correspond to a class member. The other
799 parameters are as for cp_finish_decl. Return the DECL for the
800 class member declared. */
803 grokfield (const cp_declarator *declarator,
804 cp_decl_specifier_seq *declspecs,
805 tree init, bool init_const_expr_p,
810 const char *asmspec = 0;
811 int flags = LOOKUP_ONLYCONVERTING;
815 && TREE_CODE (init) == TREE_LIST
816 && TREE_VALUE (init) == error_mark_node
817 && TREE_CHAIN (init) == NULL_TREE)
820 value = grokdeclarator (declarator, declspecs, FIELD, init != 0, &attrlist);
821 if (! value || error_operand_p (value))
822 /* friend or constructor went bad. */
823 return error_mark_node;
825 if (TREE_CODE (value) == TYPE_DECL && init)
827 error ("typedef %qD is initialized (use decltype instead)", value);
831 /* Pass friendly classes back. */
832 if (value == void_type_node)
835 /* Pass friend decls back. */
836 if ((TREE_CODE (value) == FUNCTION_DECL
837 || TREE_CODE (value) == TEMPLATE_DECL)
838 && DECL_CONTEXT (value) != current_class_type)
841 name = DECL_NAME (value);
843 if (name != NULL_TREE)
845 if (TREE_CODE (name) == TEMPLATE_ID_EXPR)
847 error ("explicit template argument list not allowed");
848 return error_mark_node;
851 if (IDENTIFIER_POINTER (name)[0] == '_'
852 && ! strcmp (IDENTIFIER_POINTER (name), "_vptr"))
853 error ("member %qD conflicts with virtual function table field name",
857 /* Stash away type declarations. */
858 if (TREE_CODE (value) == TYPE_DECL)
860 DECL_NONLOCAL (value) = 1;
861 DECL_CONTEXT (value) = current_class_type;
863 if (processing_template_decl)
864 value = push_template_decl (value);
870 /* If this is a typedef that names the class for linkage purposes
871 (7.1.3p8), apply any attributes directly to the type. */
872 if (TAGGED_TYPE_P (TREE_TYPE (value))
873 && value == TYPE_NAME (TYPE_MAIN_VARIANT (TREE_TYPE (value))))
874 attrflags = ATTR_FLAG_TYPE_IN_PLACE;
876 cplus_decl_attributes (&value, attrlist, attrflags);
879 if (declspecs->specs[(int)ds_typedef]
880 && TREE_TYPE (value) != error_mark_node
881 && TYPE_NAME (TYPE_MAIN_VARIANT (TREE_TYPE (value))) != value)
882 cp_set_underlying_type (value);
887 if (DECL_IN_AGGR_P (value))
889 error ("%qD is already defined in %qT", value, DECL_CONTEXT (value));
890 return void_type_node;
893 if (asmspec_tree && asmspec_tree != error_mark_node)
894 asmspec = TREE_STRING_POINTER (asmspec_tree);
898 if (TREE_CODE (value) == FUNCTION_DECL)
900 /* Initializers for functions are rejected early in the parser.
901 If we get here, it must be a pure specifier for a method. */
902 if (init == ridpointers[(int)RID_DELETE])
904 DECL_DELETED_FN (value) = 1;
905 DECL_DECLARED_INLINE_P (value) = 1;
906 DECL_INITIAL (value) = error_mark_node;
908 else if (init == ridpointers[(int)RID_DEFAULT])
910 if (defaultable_fn_check (value))
912 DECL_DEFAULTED_FN (value) = 1;
913 DECL_INITIALIZED_IN_CLASS_P (value) = 1;
914 DECL_DECLARED_INLINE_P (value) = 1;
917 else if (TREE_CODE (TREE_TYPE (value)) == METHOD_TYPE)
919 if (integer_zerop (init))
920 DECL_PURE_VIRTUAL_P (value) = 1;
921 else if (error_operand_p (init))
922 ; /* An error has already been reported. */
924 error ("invalid initializer for member function %qD",
929 gcc_assert (TREE_CODE (TREE_TYPE (value)) == FUNCTION_TYPE);
930 error ("initializer specified for static member function %qD",
934 else if (pedantic && TREE_CODE (value) != VAR_DECL)
935 /* Already complained in grokdeclarator. */
937 else if (!processing_template_decl)
939 if (TREE_CODE (init) == CONSTRUCTOR)
940 init = digest_init (TREE_TYPE (value), init);
942 init = integral_constant_value (init);
944 if (init != error_mark_node && !TREE_CONSTANT (init))
946 /* We can allow references to things that are effectively
947 static, since references are initialized with the
949 if (TREE_CODE (TREE_TYPE (value)) != REFERENCE_TYPE
950 || (TREE_STATIC (init) == 0
951 && (!DECL_P (init) || DECL_EXTERNAL (init) == 0)))
953 error ("field initializer is not constant");
954 init = error_mark_node;
960 if (processing_template_decl
961 && (TREE_CODE (value) == VAR_DECL || TREE_CODE (value) == FUNCTION_DECL))
963 value = push_template_decl (value);
964 if (error_operand_p (value))
965 return error_mark_node;
969 cplus_decl_attributes (&value, attrlist, 0);
971 switch (TREE_CODE (value))
974 finish_static_data_member_decl (value, init, init_const_expr_p,
975 asmspec_tree, flags);
980 error ("%<asm%> specifiers are not permitted on non-static data members");
981 if (DECL_INITIAL (value) == error_mark_node)
982 init = error_mark_node;
983 cp_finish_decl (value, init, /*init_const_expr_p=*/false,
985 DECL_INITIAL (value) = init;
986 DECL_IN_AGGR_P (value) = 1;
991 set_user_assembler_name (value, asmspec);
993 cp_finish_decl (value,
995 /*init_const_expr_p=*/false,
996 asmspec_tree, flags);
998 /* Pass friends back this way. */
999 if (DECL_FRIEND_P (value))
1000 return void_type_node;
1002 DECL_IN_AGGR_P (value) = 1;
1011 /* Like `grokfield', but for bitfields.
1012 WIDTH is non-NULL for bit fields only, and is an INTEGER_CST node. */
1015 grokbitfield (const cp_declarator *declarator,
1016 cp_decl_specifier_seq *declspecs, tree width,
1019 tree value = grokdeclarator (declarator, declspecs, BITFIELD, 0, &attrlist);
1021 if (value == error_mark_node)
1022 return NULL_TREE; /* friends went bad. */
1024 /* Pass friendly classes back. */
1025 if (TREE_CODE (value) == VOID_TYPE)
1026 return void_type_node;
1028 if (!INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (TREE_TYPE (value))
1029 && (POINTER_TYPE_P (value)
1030 || !dependent_type_p (TREE_TYPE (value))))
1032 error ("bit-field %qD with non-integral type", value);
1033 return error_mark_node;
1036 if (TREE_CODE (value) == TYPE_DECL)
1038 error ("cannot declare %qD to be a bit-field type", value);
1042 /* Usually, finish_struct_1 catches bitfields with invalid types.
1043 But, in the case of bitfields with function type, we confuse
1044 ourselves into thinking they are member functions, so we must
1046 if (TREE_CODE (value) == FUNCTION_DECL)
1048 error ("cannot declare bit-field %qD with function type",
1053 if (DECL_IN_AGGR_P (value))
1055 error ("%qD is already defined in the class %qT", value,
1056 DECL_CONTEXT (value));
1057 return void_type_node;
1060 if (TREE_STATIC (value))
1062 error ("static member %qD cannot be a bit-field", value);
1065 cp_finish_decl (value, NULL_TREE, false, NULL_TREE, 0);
1067 if (width != error_mark_node)
1069 constant_expression_warning (width);
1070 DECL_INITIAL (value) = width;
1071 SET_DECL_C_BIT_FIELD (value);
1074 DECL_IN_AGGR_P (value) = 1;
1077 cplus_decl_attributes (&value, attrlist, /*flags=*/0);
1083 /* Returns true iff ATTR is an attribute which needs to be applied at
1084 instantiation time rather than template definition time. */
1087 is_late_template_attribute (tree attr, tree decl)
1089 tree name = TREE_PURPOSE (attr);
1090 tree args = TREE_VALUE (attr);
1091 const struct attribute_spec *spec = lookup_attribute_spec (name);
1095 /* Unknown attribute. */
1098 /* Attribute weak handling wants to write out assembly right away. */
1099 if (is_attribute_p ("weak", name))
1102 /* If any of the arguments are dependent expressions, we can't evaluate
1103 the attribute until instantiation time. */
1104 for (arg = args; arg; arg = TREE_CHAIN (arg))
1106 tree t = TREE_VALUE (arg);
1108 /* If the first attribute argument is an identifier, only consider
1109 second and following arguments. Attributes like mode, format,
1110 cleanup and several target specific attributes aren't late
1111 just because they have an IDENTIFIER_NODE as first argument. */
1112 if (arg == args && TREE_CODE (t) == IDENTIFIER_NODE)
1115 if (value_dependent_expression_p (t)
1116 || type_dependent_expression_p (t))
1120 if (TREE_CODE (decl) == TYPE_DECL
1122 || spec->type_required)
1124 tree type = TYPE_P (decl) ? decl : TREE_TYPE (decl);
1126 /* We can't apply any attributes to a completely unknown type until
1127 instantiation time. */
1128 enum tree_code code = TREE_CODE (type);
1129 if (code == TEMPLATE_TYPE_PARM
1130 || code == BOUND_TEMPLATE_TEMPLATE_PARM
1131 || code == TYPENAME_TYPE)
1133 /* Also defer most attributes on dependent types. This is not
1134 necessary in all cases, but is the better default. */
1135 else if (dependent_type_p (type)
1136 /* But attribute visibility specifically works on
1138 && !is_attribute_p ("visibility", name))
1147 /* ATTR_P is a list of attributes. Remove any attributes which need to be
1148 applied at instantiation time and return them. If IS_DEPENDENT is true,
1149 the declaration itself is dependent, so all attributes should be applied
1150 at instantiation time. */
1153 splice_template_attributes (tree *attr_p, tree decl)
1156 tree late_attrs = NULL_TREE;
1157 tree *q = &late_attrs;
1164 if (is_late_template_attribute (*p, decl))
1166 ATTR_IS_DEPENDENT (*p) = 1;
1168 *p = TREE_CHAIN (*p);
1169 q = &TREE_CHAIN (*q);
1173 p = &TREE_CHAIN (*p);
1179 /* Remove any late attributes from the list in ATTR_P and attach them to
1183 save_template_attributes (tree *attr_p, tree *decl_p)
1185 tree late_attrs = splice_template_attributes (attr_p, *decl_p);
1187 tree old_attrs = NULL_TREE;
1192 if (DECL_P (*decl_p))
1193 q = &DECL_ATTRIBUTES (*decl_p);
1195 q = &TYPE_ATTRIBUTES (*decl_p);
1199 /* Place the late attributes at the beginning of the attribute
1201 TREE_CHAIN (tree_last (late_attrs)) = *q;
1204 if (!DECL_P (*decl_p) && *decl_p == TYPE_MAIN_VARIANT (*decl_p))
1206 /* We've added new attributes directly to the main variant, so
1207 now we need to update all of the other variants to include
1208 these new attributes. */
1210 for (variant = TYPE_NEXT_VARIANT (*decl_p); variant;
1211 variant = TYPE_NEXT_VARIANT (variant))
1213 gcc_assert (TYPE_ATTRIBUTES (variant) == old_attrs);
1214 TYPE_ATTRIBUTES (variant) = TYPE_ATTRIBUTES (*decl_p);
1219 /* Like reconstruct_complex_type, but handle also template trees. */
1222 cp_reconstruct_complex_type (tree type, tree bottom)
1226 if (TREE_CODE (type) == POINTER_TYPE)
1228 inner = cp_reconstruct_complex_type (TREE_TYPE (type), bottom);
1229 outer = build_pointer_type_for_mode (inner, TYPE_MODE (type),
1230 TYPE_REF_CAN_ALIAS_ALL (type));
1232 else if (TREE_CODE (type) == REFERENCE_TYPE)
1234 inner = cp_reconstruct_complex_type (TREE_TYPE (type), bottom);
1235 outer = build_reference_type_for_mode (inner, TYPE_MODE (type),
1236 TYPE_REF_CAN_ALIAS_ALL (type));
1238 else if (TREE_CODE (type) == ARRAY_TYPE)
1240 inner = cp_reconstruct_complex_type (TREE_TYPE (type), bottom);
1241 outer = build_cplus_array_type (inner, TYPE_DOMAIN (type));
1242 /* Don't call cp_build_qualified_type on ARRAY_TYPEs, the
1243 element type qualification will be handled by the recursive
1244 cp_reconstruct_complex_type call and cp_build_qualified_type
1245 for ARRAY_TYPEs changes the element type. */
1248 else if (TREE_CODE (type) == FUNCTION_TYPE)
1250 inner = cp_reconstruct_complex_type (TREE_TYPE (type), bottom);
1251 outer = build_function_type (inner, TYPE_ARG_TYPES (type));
1252 outer = apply_memfn_quals (outer, type_memfn_quals (type));
1254 else if (TREE_CODE (type) == METHOD_TYPE)
1256 inner = cp_reconstruct_complex_type (TREE_TYPE (type), bottom);
1257 /* The build_method_type_directly() routine prepends 'this' to argument list,
1258 so we must compensate by getting rid of it. */
1260 = build_method_type_directly
1261 (TREE_TYPE (TREE_VALUE (TYPE_ARG_TYPES (type))),
1263 TREE_CHAIN (TYPE_ARG_TYPES (type)));
1265 else if (TREE_CODE (type) == OFFSET_TYPE)
1267 inner = cp_reconstruct_complex_type (TREE_TYPE (type), bottom);
1268 outer = build_offset_type (TYPE_OFFSET_BASETYPE (type), inner);
1273 if (TYPE_ATTRIBUTES (type))
1274 outer = cp_build_type_attribute_variant (outer, TYPE_ATTRIBUTES (type));
1275 return cp_build_qualified_type (outer, cp_type_quals (type));
1278 /* Like decl_attributes, but handle C++ complexity. */
1281 cplus_decl_attributes (tree *decl, tree attributes, int flags)
1283 if (*decl == NULL_TREE || *decl == void_type_node
1284 || *decl == error_mark_node
1285 || attributes == NULL_TREE)
1288 if (processing_template_decl)
1290 if (check_for_bare_parameter_packs (attributes))
1293 save_template_attributes (&attributes, decl);
1294 if (attributes == NULL_TREE)
1298 if (TREE_CODE (*decl) == TEMPLATE_DECL)
1299 decl = &DECL_TEMPLATE_RESULT (*decl);
1301 decl_attributes (decl, attributes, flags);
1303 if (TREE_CODE (*decl) == TYPE_DECL)
1304 SET_IDENTIFIER_TYPE_VALUE (DECL_NAME (*decl), TREE_TYPE (*decl));
1307 /* Walks through the namespace- or function-scope anonymous union
1308 OBJECT, with the indicated TYPE, building appropriate VAR_DECLs.
1309 Returns one of the fields for use in the mangled name. */
1312 build_anon_union_vars (tree type, tree object)
1314 tree main_decl = NULL_TREE;
1317 /* Rather than write the code to handle the non-union case,
1318 just give an error. */
1319 if (TREE_CODE (type) != UNION_TYPE)
1320 error ("anonymous struct not inside named type");
1322 for (field = TYPE_FIELDS (type);
1324 field = TREE_CHAIN (field))
1329 if (DECL_ARTIFICIAL (field))
1331 if (TREE_CODE (field) != FIELD_DECL)
1333 permerror (input_location, "%q+#D invalid; an anonymous union can only "
1334 "have non-static data members", field);
1338 if (TREE_PRIVATE (field))
1339 permerror (input_location, "private member %q+#D in anonymous union", field);
1340 else if (TREE_PROTECTED (field))
1341 permerror (input_location, "protected member %q+#D in anonymous union", field);
1343 if (processing_template_decl)
1344 ref = build_min_nt (COMPONENT_REF, object,
1345 DECL_NAME (field), NULL_TREE);
1347 ref = build_class_member_access_expr (object, field, NULL_TREE,
1348 false, tf_warning_or_error);
1350 if (DECL_NAME (field))
1354 decl = build_decl (input_location,
1355 VAR_DECL, DECL_NAME (field), TREE_TYPE (field));
1356 DECL_ANON_UNION_VAR_P (decl) = 1;
1357 DECL_ARTIFICIAL (decl) = 1;
1359 base = get_base_address (object);
1360 TREE_PUBLIC (decl) = TREE_PUBLIC (base);
1361 TREE_STATIC (decl) = TREE_STATIC (base);
1362 DECL_EXTERNAL (decl) = DECL_EXTERNAL (base);
1364 SET_DECL_VALUE_EXPR (decl, ref);
1365 DECL_HAS_VALUE_EXPR_P (decl) = 1;
1367 decl = pushdecl (decl);
1369 else if (ANON_AGGR_TYPE_P (TREE_TYPE (field)))
1370 decl = build_anon_union_vars (TREE_TYPE (field), ref);
1374 if (main_decl == NULL_TREE)
1381 /* Finish off the processing of a UNION_TYPE structure. If the union is an
1382 anonymous union, then all members must be laid out together. PUBLIC_P
1383 is nonzero if this union is not declared static. */
1386 finish_anon_union (tree anon_union_decl)
1392 if (anon_union_decl == error_mark_node)
1395 type = TREE_TYPE (anon_union_decl);
1396 public_p = TREE_PUBLIC (anon_union_decl);
1398 /* The VAR_DECL's context is the same as the TYPE's context. */
1399 DECL_CONTEXT (anon_union_decl) = DECL_CONTEXT (TYPE_NAME (type));
1401 if (TYPE_FIELDS (type) == NULL_TREE)
1406 error ("namespace-scope anonymous aggregates must be static");
1410 main_decl = build_anon_union_vars (type, anon_union_decl);
1411 if (main_decl == error_mark_node)
1413 if (main_decl == NULL_TREE)
1415 warning (0, "anonymous union with no members");
1419 if (!processing_template_decl)
1421 /* Use main_decl to set the mangled name. */
1422 DECL_NAME (anon_union_decl) = DECL_NAME (main_decl);
1423 maybe_commonize_var (anon_union_decl);
1424 mangle_decl (anon_union_decl);
1425 DECL_NAME (anon_union_decl) = NULL_TREE;
1428 pushdecl (anon_union_decl);
1429 if (building_stmt_tree ()
1430 && at_function_scope_p ())
1431 add_decl_expr (anon_union_decl);
1432 else if (!processing_template_decl)
1433 rest_of_decl_compilation (anon_union_decl,
1434 toplevel_bindings_p (), at_eof);
1437 /* Auxiliary functions to make type signatures for
1438 `operator new' and `operator delete' correspond to
1439 what compiler will be expecting. */
1442 coerce_new_type (tree type)
1445 tree args = TYPE_ARG_TYPES (type);
1447 gcc_assert (TREE_CODE (type) == FUNCTION_TYPE);
1449 if (!same_type_p (TREE_TYPE (type), ptr_type_node))
1452 error ("%<operator new%> must return type %qT", ptr_type_node);
1455 if (args && args != void_list_node)
1457 if (TREE_PURPOSE (args))
1459 /* [basic.stc.dynamic.allocation]
1461 The first parameter shall not have an associated default
1463 error ("the first parameter of %<operator new%> cannot "
1464 "have a default argument");
1465 /* Throw away the default argument. */
1466 TREE_PURPOSE (args) = NULL_TREE;
1469 if (!same_type_p (TREE_VALUE (args), size_type_node))
1472 args = TREE_CHAIN (args);
1479 permerror (input_location, "%<operator new%> takes type %<size_t%> (%qT) "
1480 "as first parameter", size_type_node);
1485 args = tree_cons (NULL_TREE, size_type_node, args);
1488 type = build_exception_variant
1489 (build_function_type (ptr_type_node, args),
1490 TYPE_RAISES_EXCEPTIONS (type));
1498 coerce_delete_type (tree type)
1501 tree args = TYPE_ARG_TYPES (type);
1503 gcc_assert (TREE_CODE (type) == FUNCTION_TYPE);
1505 if (!same_type_p (TREE_TYPE (type), void_type_node))
1508 error ("%<operator delete%> must return type %qT", void_type_node);
1511 if (!args || args == void_list_node
1512 || !same_type_p (TREE_VALUE (args), ptr_type_node))
1515 if (args && args != void_list_node)
1516 args = TREE_CHAIN (args);
1517 error ("%<operator delete%> takes type %qT as first parameter",
1523 args = tree_cons (NULL_TREE, ptr_type_node, args);
1526 type = build_exception_variant
1527 (build_function_type (void_type_node, args),
1528 TYPE_RAISES_EXCEPTIONS (type));
1536 /* DECL is a VAR_DECL for a vtable: walk through the entries in the vtable
1537 and mark them as needed. */
1540 mark_vtable_entries (tree decl)
1543 unsigned HOST_WIDE_INT idx;
1545 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (DECL_INITIAL (decl)),
1550 STRIP_NOPS (fnaddr);
1552 if (TREE_CODE (fnaddr) != ADDR_EXPR
1553 && TREE_CODE (fnaddr) != FDESC_EXPR)
1554 /* This entry is an offset: a virtual base class offset, a
1555 virtual call offset, an RTTI offset, etc. */
1558 fn = TREE_OPERAND (fnaddr, 0);
1559 TREE_ADDRESSABLE (fn) = 1;
1560 /* When we don't have vcall offsets, we output thunks whenever
1561 we output the vtables that contain them. With vcall offsets,
1562 we know all the thunks we'll need when we emit a virtual
1563 function, so we emit the thunks there instead. */
1564 if (DECL_THUNK_P (fn))
1565 use_thunk (fn, /*emit_p=*/0);
1570 /* Set DECL up to have the closest approximation of "initialized common"
1571 linkage available. */
1574 comdat_linkage (tree decl)
1577 make_decl_one_only (decl, cxx_comdat_group (decl));
1578 else if (TREE_CODE (decl) == FUNCTION_DECL
1579 || (TREE_CODE (decl) == VAR_DECL && DECL_ARTIFICIAL (decl)))
1580 /* We can just emit function and compiler-generated variables
1581 statically; having multiple copies is (for the most part) only
1584 There are two correctness issues, however: the address of a
1585 template instantiation with external linkage should be the
1586 same, independent of what translation unit asks for the
1587 address, and this will not hold when we emit multiple copies of
1588 the function. However, there's little else we can do.
1590 Also, by default, the typeinfo implementation assumes that
1591 there will be only one copy of the string used as the name for
1592 each type. Therefore, if weak symbols are unavailable, the
1593 run-time library should perform a more conservative check; it
1594 should perform a string comparison, rather than an address
1596 TREE_PUBLIC (decl) = 0;
1599 /* Static data member template instantiations, however, cannot
1600 have multiple copies. */
1601 if (DECL_INITIAL (decl) == 0
1602 || DECL_INITIAL (decl) == error_mark_node)
1603 DECL_COMMON (decl) = 1;
1604 else if (EMPTY_CONSTRUCTOR_P (DECL_INITIAL (decl)))
1606 DECL_COMMON (decl) = 1;
1607 DECL_INITIAL (decl) = error_mark_node;
1609 else if (!DECL_EXPLICIT_INSTANTIATION (decl))
1611 /* We can't do anything useful; leave vars for explicit
1613 DECL_EXTERNAL (decl) = 1;
1614 DECL_NOT_REALLY_EXTERN (decl) = 0;
1618 DECL_COMDAT (decl) = 1;
1621 /* For win32 we also want to put explicit instantiations in
1622 linkonce sections, so that they will be merged with implicit
1623 instantiations; otherwise we get duplicate symbol errors.
1624 For Darwin we do not want explicit instantiations to be
1628 maybe_make_one_only (tree decl)
1630 /* We used to say that this was not necessary on targets that support weak
1631 symbols, because the implicit instantiations will defer to the explicit
1632 one. However, that's not actually the case in SVR4; a strong definition
1633 after a weak one is an error. Also, not making explicit
1634 instantiations one_only means that we can end up with two copies of
1635 some template instantiations. */
1639 /* We can't set DECL_COMDAT on functions, or cp_finish_file will think
1640 we can get away with not emitting them if they aren't used. We need
1641 to for variables so that cp_finish_decl will update their linkage,
1642 because their DECL_INITIAL may not have been set properly yet. */
1644 if (!TARGET_WEAK_NOT_IN_ARCHIVE_TOC
1645 || (! DECL_EXPLICIT_INSTANTIATION (decl)
1646 && ! DECL_TEMPLATE_SPECIALIZATION (decl)))
1648 make_decl_one_only (decl, cxx_comdat_group (decl));
1650 if (TREE_CODE (decl) == VAR_DECL)
1652 DECL_COMDAT (decl) = 1;
1653 /* Mark it needed so we don't forget to emit it. */
1654 mark_decl_referenced (decl);
1659 /* Returns true iff DECL, a FUNCTION_DECL or VAR_DECL, has vague linkage.
1660 This predicate will give the right answer during parsing of the
1661 function, which other tests may not. */
1664 vague_linkage_p (tree decl)
1666 /* Unfortunately, import_export_decl has not always been called
1667 before the function is processed, so we cannot simply check
1669 return (DECL_COMDAT (decl)
1670 || (((TREE_CODE (decl) == FUNCTION_DECL
1671 && DECL_DECLARED_INLINE_P (decl))
1672 || (DECL_LANG_SPECIFIC (decl)
1673 && DECL_TEMPLATE_INSTANTIATION (decl)))
1674 && TREE_PUBLIC (decl)));
1677 /* Determine whether or not we want to specifically import or export CTYPE,
1678 using various heuristics. */
1681 import_export_class (tree ctype)
1683 /* -1 for imported, 1 for exported. */
1684 int import_export = 0;
1686 /* It only makes sense to call this function at EOF. The reason is
1687 that this function looks at whether or not the first non-inline
1688 non-abstract virtual member function has been defined in this
1689 translation unit. But, we can't possibly know that until we've
1690 seen the entire translation unit. */
1691 gcc_assert (at_eof);
1693 if (CLASSTYPE_INTERFACE_KNOWN (ctype))
1696 /* If MULTIPLE_SYMBOL_SPACES is set and we saw a #pragma interface,
1697 we will have CLASSTYPE_INTERFACE_ONLY set but not
1698 CLASSTYPE_INTERFACE_KNOWN. In that case, we don't want to use this
1699 heuristic because someone will supply a #pragma implementation
1700 elsewhere, and deducing it here would produce a conflict. */
1701 if (CLASSTYPE_INTERFACE_ONLY (ctype))
1704 if (lookup_attribute ("dllimport", TYPE_ATTRIBUTES (ctype)))
1706 else if (lookup_attribute ("dllexport", TYPE_ATTRIBUTES (ctype)))
1708 else if (CLASSTYPE_IMPLICIT_INSTANTIATION (ctype)
1709 && !flag_implicit_templates)
1710 /* For a template class, without -fimplicit-templates, check the
1711 repository. If the virtual table is assigned to this
1712 translation unit, then export the class; otherwise, import
1714 import_export = repo_export_class_p (ctype) ? 1 : -1;
1715 else if (TYPE_POLYMORPHIC_P (ctype))
1717 /* The ABI specifies that the virtual table and associated
1718 information are emitted with the key method, if any. */
1719 tree method = CLASSTYPE_KEY_METHOD (ctype);
1720 /* If weak symbol support is not available, then we must be
1721 careful not to emit the vtable when the key function is
1722 inline. An inline function can be defined in multiple
1723 translation units. If we were to emit the vtable in each
1724 translation unit containing a definition, we would get
1725 multiple definition errors at link-time. */
1726 if (method && (flag_weak || ! DECL_DECLARED_INLINE_P (method)))
1727 import_export = (DECL_REALLY_EXTERN (method) ? -1 : 1);
1730 /* When MULTIPLE_SYMBOL_SPACES is set, we cannot count on seeing
1731 a definition anywhere else. */
1732 if (MULTIPLE_SYMBOL_SPACES && import_export == -1)
1735 /* Allow back ends the chance to overrule the decision. */
1736 if (targetm.cxx.import_export_class)
1737 import_export = targetm.cxx.import_export_class (ctype, import_export);
1741 SET_CLASSTYPE_INTERFACE_KNOWN (ctype);
1742 CLASSTYPE_INTERFACE_ONLY (ctype) = (import_export < 0);
1746 /* Return true if VAR has already been provided to the back end; in that
1747 case VAR should not be modified further by the front end. */
1749 var_finalized_p (tree var)
1751 return varpool_node (var)->finalized;
1754 /* DECL is a VAR_DECL or FUNCTION_DECL which, for whatever reason,
1755 must be emitted in this translation unit. Mark it as such. */
1758 mark_needed (tree decl)
1760 /* It's possible that we no longer need to set
1761 TREE_SYMBOL_REFERENCED here directly, but doing so is
1763 TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)) = 1;
1764 mark_decl_referenced (decl);
1767 /* DECL is either a FUNCTION_DECL or a VAR_DECL. This function
1768 returns true if a definition of this entity should be provided in
1769 this object file. Callers use this function to determine whether
1770 or not to let the back end know that a definition of DECL is
1771 available in this translation unit. */
1774 decl_needed_p (tree decl)
1776 gcc_assert (TREE_CODE (decl) == VAR_DECL
1777 || TREE_CODE (decl) == FUNCTION_DECL);
1778 /* This function should only be called at the end of the translation
1779 unit. We cannot be sure of whether or not something will be
1780 COMDAT until that point. */
1781 gcc_assert (at_eof);
1783 /* All entities with external linkage that are not COMDAT should be
1784 emitted; they may be referred to from other object files. */
1785 if (TREE_PUBLIC (decl) && !DECL_COMDAT (decl))
1787 /* If this entity was used, let the back end see it; it will decide
1788 whether or not to emit it into the object file. */
1789 if (TREE_USED (decl)
1790 || (DECL_ASSEMBLER_NAME_SET_P (decl)
1791 && TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))))
1793 /* Functions marked "dllexport" must be emitted so that they are
1794 visible to other DLLs. */
1795 if (lookup_attribute ("dllexport", DECL_ATTRIBUTES (decl)))
1797 /* Otherwise, DECL does not need to be emitted -- yet. A subsequent
1798 reference to DECL might cause it to be emitted later. */
1802 /* If necessary, write out the vtables for the dynamic class CTYPE.
1803 Returns true if any vtables were emitted. */
1806 maybe_emit_vtables (tree ctype)
1812 /* If the vtables for this class have already been emitted there is
1813 nothing more to do. */
1814 primary_vtbl = CLASSTYPE_VTABLES (ctype);
1815 if (var_finalized_p (primary_vtbl))
1817 /* Ignore dummy vtables made by get_vtable_decl. */
1818 if (TREE_TYPE (primary_vtbl) == void_type_node)
1821 /* On some targets, we cannot determine the key method until the end
1822 of the translation unit -- which is when this function is
1824 if (!targetm.cxx.key_method_may_be_inline ())
1825 determine_key_method (ctype);
1827 /* See if any of the vtables are needed. */
1828 for (vtbl = CLASSTYPE_VTABLES (ctype); vtbl; vtbl = TREE_CHAIN (vtbl))
1830 import_export_decl (vtbl);
1831 if (DECL_NOT_REALLY_EXTERN (vtbl) && decl_needed_p (vtbl))
1836 /* If the references to this class' vtables are optimized away,
1837 still emit the appropriate debugging information. See
1839 if (DECL_COMDAT (primary_vtbl)
1840 && CLASSTYPE_DEBUG_REQUESTED (ctype))
1841 note_debug_info_needed (ctype);
1845 /* The ABI requires that we emit all of the vtables if we emit any
1847 for (vtbl = CLASSTYPE_VTABLES (ctype); vtbl; vtbl = TREE_CHAIN (vtbl))
1849 /* Mark entities references from the virtual table as used. */
1850 mark_vtable_entries (vtbl);
1852 if (TREE_TYPE (DECL_INITIAL (vtbl)) == 0)
1854 tree expr = store_init_value (vtbl, DECL_INITIAL (vtbl), LOOKUP_NORMAL);
1856 /* It had better be all done at compile-time. */
1861 DECL_EXTERNAL (vtbl) = 0;
1862 rest_of_decl_compilation (vtbl, 1, 1);
1864 /* Because we're only doing syntax-checking, we'll never end up
1865 actually marking the variable as written. */
1866 if (flag_syntax_only)
1867 TREE_ASM_WRITTEN (vtbl) = 1;
1870 /* Since we're writing out the vtable here, also write the debug
1872 note_debug_info_needed (ctype);
1877 /* A special return value from type_visibility meaning internal
1880 enum { VISIBILITY_ANON = VISIBILITY_INTERNAL+1 };
1882 /* walk_tree helper function for type_visibility. */
1885 min_vis_r (tree *tp, int *walk_subtrees, void *data)
1887 int *vis_p = (int *)data;
1892 else if (CLASS_TYPE_P (*tp))
1894 if (!TREE_PUBLIC (TYPE_MAIN_DECL (*tp)))
1896 *vis_p = VISIBILITY_ANON;
1899 else if (CLASSTYPE_VISIBILITY (*tp) > *vis_p)
1900 *vis_p = CLASSTYPE_VISIBILITY (*tp);
1905 /* Returns the visibility of TYPE, which is the minimum visibility of its
1909 type_visibility (tree type)
1911 int vis = VISIBILITY_DEFAULT;
1912 cp_walk_tree_without_duplicates (&type, min_vis_r, &vis);
1916 /* Limit the visibility of DECL to VISIBILITY, if not explicitly
1917 specified (or if VISIBILITY is static). */
1920 constrain_visibility (tree decl, int visibility)
1922 if (visibility == VISIBILITY_ANON)
1924 /* extern "C" declarations aren't affected by the anonymous
1926 if (!DECL_EXTERN_C_P (decl))
1928 TREE_PUBLIC (decl) = 0;
1929 DECL_WEAK (decl) = 0;
1930 DECL_COMMON (decl) = 0;
1931 DECL_COMDAT_GROUP (decl) = NULL_TREE;
1932 DECL_INTERFACE_KNOWN (decl) = 1;
1933 if (DECL_LANG_SPECIFIC (decl))
1934 DECL_NOT_REALLY_EXTERN (decl) = 1;
1937 else if (visibility > DECL_VISIBILITY (decl)
1938 && !DECL_VISIBILITY_SPECIFIED (decl))
1940 DECL_VISIBILITY (decl) = (enum symbol_visibility) visibility;
1946 /* Constrain the visibility of DECL based on the visibility of its template
1950 constrain_visibility_for_template (tree decl, tree targs)
1952 /* If this is a template instantiation, check the innermost
1953 template args for visibility constraints. The outer template
1954 args are covered by the class check. */
1955 tree args = INNERMOST_TEMPLATE_ARGS (targs);
1957 for (i = TREE_VEC_LENGTH (args); i > 0; --i)
1961 tree arg = TREE_VEC_ELT (args, i-1);
1963 vis = type_visibility (arg);
1964 else if (TREE_TYPE (arg) && POINTER_TYPE_P (TREE_TYPE (arg)))
1967 if (TREE_CODE (arg) == ADDR_EXPR)
1968 arg = TREE_OPERAND (arg, 0);
1969 if (TREE_CODE (arg) == VAR_DECL
1970 || TREE_CODE (arg) == FUNCTION_DECL)
1972 if (! TREE_PUBLIC (arg))
1973 vis = VISIBILITY_ANON;
1975 vis = DECL_VISIBILITY (arg);
1979 constrain_visibility (decl, vis);
1983 /* Like c_determine_visibility, but with additional C++-specific
1986 Function-scope entities can rely on the function's visibility because
1987 it is set in start_preparsed_function.
1989 Class-scope entities cannot rely on the class's visibility until the end
1990 of the enclosing class definition.
1992 Note that because namespaces have multiple independent definitions,
1993 namespace visibility is handled elsewhere using the #pragma visibility
1994 machinery rather than by decorating the namespace declaration.
1996 The goal is for constraints from the type to give a diagnostic, and
1997 other constraints to be applied silently. */
2000 determine_visibility (tree decl)
2002 tree class_type = NULL_TREE;
2004 bool orig_visibility_specified;
2005 enum symbol_visibility orig_visibility;
2007 /* Remember that all decls get VISIBILITY_DEFAULT when built. */
2009 /* Only relevant for names with external linkage. */
2010 if (!TREE_PUBLIC (decl))
2013 /* Cloned constructors and destructors get the same visibility as
2014 the underlying function. That should be set up in
2015 maybe_clone_body. */
2016 gcc_assert (!DECL_CLONED_FUNCTION_P (decl));
2018 orig_visibility_specified = DECL_VISIBILITY_SPECIFIED (decl);
2019 orig_visibility = DECL_VISIBILITY (decl);
2021 if (TREE_CODE (decl) == TYPE_DECL)
2023 if (CLASS_TYPE_P (TREE_TYPE (decl)))
2024 use_template = CLASSTYPE_USE_TEMPLATE (TREE_TYPE (decl));
2025 else if (TYPE_TEMPLATE_INFO (TREE_TYPE (decl)))
2030 else if (DECL_LANG_SPECIFIC (decl))
2031 use_template = DECL_USE_TEMPLATE (decl);
2035 /* If DECL is a member of a class, visibility specifiers on the
2036 class can influence the visibility of the DECL. */
2037 if (DECL_CLASS_SCOPE_P (decl))
2038 class_type = DECL_CONTEXT (decl);
2041 /* Not a class member. */
2043 /* Virtual tables have DECL_CONTEXT set to their associated class,
2044 so they are automatically handled above. */
2045 gcc_assert (TREE_CODE (decl) != VAR_DECL
2046 || !DECL_VTABLE_OR_VTT_P (decl));
2048 if (DECL_FUNCTION_SCOPE_P (decl) && ! DECL_VISIBILITY_SPECIFIED (decl))
2050 /* Local statics and classes get the visibility of their
2051 containing function by default, except that
2052 -fvisibility-inlines-hidden doesn't affect them. */
2053 tree fn = DECL_CONTEXT (decl);
2054 if (DECL_VISIBILITY_SPECIFIED (fn) || ! DECL_CLASS_SCOPE_P (fn))
2056 DECL_VISIBILITY (decl) = DECL_VISIBILITY (fn);
2057 DECL_VISIBILITY_SPECIFIED (decl) =
2058 DECL_VISIBILITY_SPECIFIED (fn);
2061 determine_visibility_from_class (decl, DECL_CONTEXT (fn));
2063 /* Local classes in templates have CLASSTYPE_USE_TEMPLATE set,
2064 but have no TEMPLATE_INFO, so don't try to check it. */
2067 else if (TREE_CODE (decl) == VAR_DECL && DECL_TINFO_P (decl)
2068 && flag_visibility_ms_compat)
2070 /* Under -fvisibility-ms-compat, types are visible by default,
2071 even though their contents aren't. */
2072 tree underlying_type = TREE_TYPE (DECL_NAME (decl));
2073 int underlying_vis = type_visibility (underlying_type);
2074 if (underlying_vis == VISIBILITY_ANON
2075 || CLASSTYPE_VISIBILITY_SPECIFIED (underlying_type))
2076 constrain_visibility (decl, underlying_vis);
2078 DECL_VISIBILITY (decl) = VISIBILITY_DEFAULT;
2080 else if (TREE_CODE (decl) == VAR_DECL && DECL_TINFO_P (decl))
2082 /* tinfo visibility is based on the type it's for. */
2083 constrain_visibility
2084 (decl, type_visibility (TREE_TYPE (DECL_NAME (decl))));
2086 /* Give the target a chance to override the visibility associated
2088 if (TREE_PUBLIC (decl)
2089 && !DECL_REALLY_EXTERN (decl)
2090 && CLASS_TYPE_P (TREE_TYPE (DECL_NAME (decl)))
2091 && !CLASSTYPE_VISIBILITY_SPECIFIED (TREE_TYPE (DECL_NAME (decl))))
2092 targetm.cxx.determine_class_data_visibility (decl);
2094 else if (use_template)
2095 /* Template instantiations and specializations get visibility based
2096 on their template unless they override it with an attribute. */;
2097 else if (! DECL_VISIBILITY_SPECIFIED (decl))
2099 /* Set default visibility to whatever the user supplied with
2100 #pragma GCC visibility or a namespace visibility attribute. */
2101 DECL_VISIBILITY (decl) = default_visibility;
2102 DECL_VISIBILITY_SPECIFIED (decl) = visibility_options.inpragma;
2108 /* If the specialization doesn't specify visibility, use the
2109 visibility from the template. */
2110 tree tinfo = (TREE_CODE (decl) == TYPE_DECL
2111 ? TYPE_TEMPLATE_INFO (TREE_TYPE (decl))
2112 : DECL_TEMPLATE_INFO (decl));
2113 tree args = TI_ARGS (tinfo);
2115 if (args != error_mark_node)
2117 int depth = TMPL_ARGS_DEPTH (args);
2118 tree pattern = DECL_TEMPLATE_RESULT (TI_TEMPLATE (tinfo));
2120 if (!DECL_VISIBILITY_SPECIFIED (decl))
2122 DECL_VISIBILITY (decl) = DECL_VISIBILITY (pattern);
2123 DECL_VISIBILITY_SPECIFIED (decl)
2124 = DECL_VISIBILITY_SPECIFIED (pattern);
2127 /* FIXME should TMPL_ARGS_DEPTH really return 1 for null input? */
2128 if (args && depth > template_class_depth (class_type))
2129 /* Limit visibility based on its template arguments. */
2130 constrain_visibility_for_template (decl, args);
2135 determine_visibility_from_class (decl, class_type);
2137 if (decl_anon_ns_mem_p (decl))
2138 /* Names in an anonymous namespace get internal linkage.
2139 This might change once we implement export. */
2140 constrain_visibility (decl, VISIBILITY_ANON);
2141 else if (TREE_CODE (decl) != TYPE_DECL)
2143 /* Propagate anonymity from type to decl. */
2144 int tvis = type_visibility (TREE_TYPE (decl));
2145 if (tvis == VISIBILITY_ANON
2146 || ! DECL_VISIBILITY_SPECIFIED (decl))
2147 constrain_visibility (decl, tvis);
2149 else if (no_linkage_check (TREE_TYPE (decl), /*relaxed_p=*/true))
2150 /* DR 757: A type without linkage shall not be used as the type of a
2151 variable or function with linkage, unless
2152 o the variable or function has extern "C" linkage (7.5 [dcl.link]), or
2153 o the variable or function is not used (3.2 [basic.def.odr]) or is
2154 defined in the same translation unit.
2156 Since non-extern "C" decls need to be defined in the same
2157 translation unit, we can make the type internal. */
2158 constrain_visibility (decl, VISIBILITY_ANON);
2160 /* If visibility changed and DECL already has DECL_RTL, ensure
2161 symbol flags are updated. */
2162 if ((DECL_VISIBILITY (decl) != orig_visibility
2163 || DECL_VISIBILITY_SPECIFIED (decl) != orig_visibility_specified)
2164 && ((TREE_CODE (decl) == VAR_DECL && TREE_STATIC (decl))
2165 || TREE_CODE (decl) == FUNCTION_DECL)
2166 && DECL_RTL_SET_P (decl))
2167 make_decl_rtl (decl);
2170 /* By default, static data members and function members receive
2171 the visibility of their containing class. */
2174 determine_visibility_from_class (tree decl, tree class_type)
2176 if (DECL_VISIBILITY_SPECIFIED (decl))
2179 if (visibility_options.inlines_hidden
2180 /* Don't do this for inline templates; specializations might not be
2181 inline, and we don't want them to inherit the hidden
2182 visibility. We'll set it here for all inline instantiations. */
2183 && !processing_template_decl
2184 && TREE_CODE (decl) == FUNCTION_DECL
2185 && DECL_DECLARED_INLINE_P (decl)
2186 && (! DECL_LANG_SPECIFIC (decl)
2187 || ! DECL_EXPLICIT_INSTANTIATION (decl)))
2188 DECL_VISIBILITY (decl) = VISIBILITY_HIDDEN;
2191 /* Default to the class visibility. */
2192 DECL_VISIBILITY (decl) = CLASSTYPE_VISIBILITY (class_type);
2193 DECL_VISIBILITY_SPECIFIED (decl)
2194 = CLASSTYPE_VISIBILITY_SPECIFIED (class_type);
2197 /* Give the target a chance to override the visibility associated
2199 if (TREE_CODE (decl) == VAR_DECL
2200 && (DECL_TINFO_P (decl)
2201 || (DECL_VTABLE_OR_VTT_P (decl)
2202 /* Construction virtual tables are not exported because
2203 they cannot be referred to from other object files;
2204 their name is not standardized by the ABI. */
2205 && !DECL_CONSTRUCTION_VTABLE_P (decl)))
2206 && TREE_PUBLIC (decl)
2207 && !DECL_REALLY_EXTERN (decl)
2208 && !CLASSTYPE_VISIBILITY_SPECIFIED (class_type))
2209 targetm.cxx.determine_class_data_visibility (decl);
2212 /* Constrain the visibility of a class TYPE based on the visibility of its
2213 field types. Warn if any fields require lesser visibility. */
2216 constrain_class_visibility (tree type)
2222 int vis = type_visibility (type);
2224 if (vis == VISIBILITY_ANON
2225 || DECL_IN_SYSTEM_HEADER (TYPE_MAIN_DECL (type)))
2228 /* Don't warn about visibility if the class has explicit visibility. */
2229 if (CLASSTYPE_VISIBILITY_SPECIFIED (type))
2230 vis = VISIBILITY_INTERNAL;
2232 for (t = TYPE_FIELDS (type); t; t = TREE_CHAIN (t))
2233 if (TREE_CODE (t) == FIELD_DECL && TREE_TYPE (t) != error_mark_node)
2235 tree ftype = strip_pointer_or_array_types (TREE_TYPE (t));
2236 int subvis = type_visibility (ftype);
2238 if (subvis == VISIBILITY_ANON)
2240 if (!in_main_input_context ())
2242 %qT has a field %qD whose type uses the anonymous namespace",
2245 else if (MAYBE_CLASS_TYPE_P (ftype)
2246 && vis < VISIBILITY_HIDDEN
2247 && subvis >= VISIBILITY_HIDDEN)
2248 warning (OPT_Wattributes, "\
2249 %qT declared with greater visibility than the type of its field %qD",
2253 binfo = TYPE_BINFO (type);
2254 for (i = 0; BINFO_BASE_ITERATE (binfo, i, t); ++i)
2256 int subvis = type_visibility (TREE_TYPE (t));
2258 if (subvis == VISIBILITY_ANON)
2260 if (!in_main_input_context())
2262 %qT has a base %qT whose type uses the anonymous namespace",
2263 type, TREE_TYPE (t));
2265 else if (vis < VISIBILITY_HIDDEN
2266 && subvis >= VISIBILITY_HIDDEN)
2267 warning (OPT_Wattributes, "\
2268 %qT declared with greater visibility than its base %qT",
2269 type, TREE_TYPE (t));
2273 /* DECL is a FUNCTION_DECL or VAR_DECL. If the object file linkage
2274 for DECL has not already been determined, do so now by setting
2275 DECL_EXTERNAL, DECL_COMDAT and other related flags. Until this
2276 function is called entities with vague linkage whose definitions
2277 are available must have TREE_PUBLIC set.
2279 If this function decides to place DECL in COMDAT, it will set
2280 appropriate flags -- but will not clear DECL_EXTERNAL. It is up to
2281 the caller to decide whether or not to clear DECL_EXTERNAL. Some
2282 callers defer that decision until it is clear that DECL is actually
2286 import_export_decl (tree decl)
2291 tree class_type = NULL_TREE;
2293 if (DECL_INTERFACE_KNOWN (decl))
2296 /* We cannot determine what linkage to give to an entity with vague
2297 linkage until the end of the file. For example, a virtual table
2298 for a class will be defined if and only if the key method is
2299 defined in this translation unit. As a further example, consider
2300 that when compiling a translation unit that uses PCH file with
2301 "-frepo" it would be incorrect to make decisions about what
2302 entities to emit when building the PCH; those decisions must be
2303 delayed until the repository information has been processed. */
2304 gcc_assert (at_eof);
2305 /* Object file linkage for explicit instantiations is handled in
2306 mark_decl_instantiated. For static variables in functions with
2307 vague linkage, maybe_commonize_var is used.
2309 Therefore, the only declarations that should be provided to this
2310 function are those with external linkage that are:
2312 * implicit instantiations of function templates
2316 * implicit instantiations of static data members of class
2323 Furthermore, all entities that reach this point must have a
2324 definition available in this translation unit.
2326 The following assertions check these conditions. */
2327 gcc_assert (TREE_CODE (decl) == FUNCTION_DECL
2328 || TREE_CODE (decl) == VAR_DECL);
2329 /* Any code that creates entities with TREE_PUBLIC cleared should
2330 also set DECL_INTERFACE_KNOWN. */
2331 gcc_assert (TREE_PUBLIC (decl));
2332 if (TREE_CODE (decl) == FUNCTION_DECL)
2333 gcc_assert (DECL_IMPLICIT_INSTANTIATION (decl)
2334 || DECL_FRIEND_PSEUDO_TEMPLATE_INSTANTIATION (decl)
2335 || DECL_DECLARED_INLINE_P (decl));
2337 gcc_assert (DECL_IMPLICIT_INSTANTIATION (decl)
2338 || DECL_VTABLE_OR_VTT_P (decl)
2339 || DECL_TINFO_P (decl));
2340 /* Check that a definition of DECL is available in this translation
2342 gcc_assert (!DECL_REALLY_EXTERN (decl));
2344 /* Assume that DECL will not have COMDAT linkage. */
2346 /* Assume that DECL will not be imported into this translation
2350 /* See if the repository tells us whether or not to emit DECL in
2351 this translation unit. */
2352 emit_p = repo_emit_p (decl);
2355 else if (emit_p == 1)
2357 /* The repository indicates that this entity should be defined
2358 here. Make sure the back end honors that request. */
2359 if (TREE_CODE (decl) == VAR_DECL)
2361 else if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (decl)
2362 || DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P (decl))
2365 FOR_EACH_CLONE (clone, decl)
2366 mark_needed (clone);
2370 /* Output the definition as an ordinary strong definition. */
2371 DECL_EXTERNAL (decl) = 0;
2372 DECL_INTERFACE_KNOWN (decl) = 1;
2377 /* We have already decided what to do with this DECL; there is no
2378 need to check anything further. */
2380 else if (TREE_CODE (decl) == VAR_DECL && DECL_VTABLE_OR_VTT_P (decl))
2382 class_type = DECL_CONTEXT (decl);
2383 import_export_class (class_type);
2384 if (TYPE_FOR_JAVA (class_type))
2386 else if (CLASSTYPE_INTERFACE_KNOWN (class_type)
2387 && CLASSTYPE_INTERFACE_ONLY (class_type))
2389 else if ((!flag_weak || TARGET_WEAK_NOT_IN_ARCHIVE_TOC)
2390 && !CLASSTYPE_USE_TEMPLATE (class_type)
2391 && CLASSTYPE_KEY_METHOD (class_type)
2392 && !DECL_DECLARED_INLINE_P (CLASSTYPE_KEY_METHOD (class_type)))
2393 /* The ABI requires that all virtual tables be emitted with
2394 COMDAT linkage. However, on systems where COMDAT symbols
2395 don't show up in the table of contents for a static
2396 archive, or on systems without weak symbols (where we
2397 approximate COMDAT linkage by using internal linkage), the
2398 linker will report errors about undefined symbols because
2399 it will not see the virtual table definition. Therefore,
2400 in the case that we know that the virtual table will be
2401 emitted in only one translation unit, we make the virtual
2402 table an ordinary definition with external linkage. */
2403 DECL_EXTERNAL (decl) = 0;
2404 else if (CLASSTYPE_INTERFACE_KNOWN (class_type))
2406 /* CLASS_TYPE is being exported from this translation unit,
2407 so DECL should be defined here. */
2408 if (!flag_weak && CLASSTYPE_EXPLICIT_INSTANTIATION (class_type))
2409 /* If a class is declared in a header with the "extern
2410 template" extension, then it will not be instantiated,
2411 even in translation units that would normally require
2412 it. Often such classes are explicitly instantiated in
2413 one translation unit. Therefore, the explicit
2414 instantiation must be made visible to other translation
2416 DECL_EXTERNAL (decl) = 0;
2419 /* The generic C++ ABI says that class data is always
2420 COMDAT, even if there is a key function. Some
2421 variants (e.g., the ARM EABI) says that class data
2422 only has COMDAT linkage if the class data might be
2423 emitted in more than one translation unit. When the
2424 key method can be inline and is inline, we still have
2425 to arrange for comdat even though
2426 class_data_always_comdat is false. */
2427 if (!CLASSTYPE_KEY_METHOD (class_type)
2428 || DECL_DECLARED_INLINE_P (CLASSTYPE_KEY_METHOD (class_type))
2429 || targetm.cxx.class_data_always_comdat ())
2431 /* The ABI requires COMDAT linkage. Normally, we
2432 only emit COMDAT things when they are needed;
2433 make sure that we realize that this entity is
2440 else if (!flag_implicit_templates
2441 && CLASSTYPE_IMPLICIT_INSTANTIATION (class_type))
2446 else if (TREE_CODE (decl) == VAR_DECL && DECL_TINFO_P (decl))
2448 tree type = TREE_TYPE (DECL_NAME (decl));
2449 if (CLASS_TYPE_P (type))
2452 import_export_class (type);
2453 if (CLASSTYPE_INTERFACE_KNOWN (type)
2454 && TYPE_POLYMORPHIC_P (type)
2455 && CLASSTYPE_INTERFACE_ONLY (type)
2456 /* If -fno-rtti was specified, then we cannot be sure
2457 that RTTI information will be emitted with the
2458 virtual table of the class, so we must emit it
2459 wherever it is used. */
2464 if (CLASSTYPE_INTERFACE_KNOWN (type)
2465 && !CLASSTYPE_INTERFACE_ONLY (type))
2467 comdat_p = (targetm.cxx.class_data_always_comdat ()
2468 || (CLASSTYPE_KEY_METHOD (type)
2469 && DECL_DECLARED_INLINE_P (CLASSTYPE_KEY_METHOD (type))));
2474 DECL_EXTERNAL (decl) = 0;
2484 else if (DECL_TEMPLATE_INSTANTIATION (decl)
2485 || DECL_FRIEND_PSEUDO_TEMPLATE_INSTANTIATION (decl))
2487 /* DECL is an implicit instantiation of a function or static
2489 if ((flag_implicit_templates
2490 && !flag_use_repository)
2491 || (flag_implicit_inline_templates
2492 && TREE_CODE (decl) == FUNCTION_DECL
2493 && DECL_DECLARED_INLINE_P (decl)))
2496 /* If we are not implicitly generating templates, then mark
2497 this entity as undefined in this translation unit. */
2500 else if (DECL_FUNCTION_MEMBER_P (decl))
2502 if (!DECL_DECLARED_INLINE_P (decl))
2504 tree ctype = DECL_CONTEXT (decl);
2505 import_export_class (ctype);
2506 if (CLASSTYPE_INTERFACE_KNOWN (ctype))
2508 DECL_NOT_REALLY_EXTERN (decl)
2509 = ! (CLASSTYPE_INTERFACE_ONLY (ctype)
2510 || (DECL_DECLARED_INLINE_P (decl)
2511 && ! flag_implement_inlines
2512 && !DECL_VINDEX (decl)));
2514 if (!DECL_NOT_REALLY_EXTERN (decl))
2515 DECL_EXTERNAL (decl) = 1;
2517 /* Always make artificials weak. */
2518 if (DECL_ARTIFICIAL (decl) && flag_weak)
2521 maybe_make_one_only (decl);
2532 /* If we are importing DECL into this translation unit, mark is
2533 an undefined here. */
2534 DECL_EXTERNAL (decl) = 1;
2535 DECL_NOT_REALLY_EXTERN (decl) = 0;
2539 /* If we decided to put DECL in COMDAT, mark it accordingly at
2541 comdat_linkage (decl);
2544 DECL_INTERFACE_KNOWN (decl) = 1;
2547 /* Return an expression that performs the destruction of DECL, which
2548 must be a VAR_DECL whose type has a non-trivial destructor, or is
2549 an array whose (innermost) elements have a non-trivial destructor. */
2552 build_cleanup (tree decl)
2555 tree type = TREE_TYPE (decl);
2557 /* This function should only be called for declarations that really
2558 require cleanups. */
2559 gcc_assert (!TYPE_HAS_TRIVIAL_DESTRUCTOR (type));
2561 /* Treat all objects with destructors as used; the destructor may do
2562 something substantive. */
2565 if (TREE_CODE (type) == ARRAY_TYPE)
2568 temp = build_address (decl);
2569 temp = build_delete (TREE_TYPE (temp), temp,
2570 sfk_complete_destructor,
2571 LOOKUP_NORMAL|LOOKUP_NONVIRTUAL|LOOKUP_DESTRUCTOR, 0);
2575 /* Returns the initialization guard variable for the variable DECL,
2576 which has static storage duration. */
2579 get_guard (tree decl)
2584 sname = mangle_guard_variable (decl);
2585 guard = IDENTIFIER_GLOBAL_VALUE (sname);
2590 /* We use a type that is big enough to contain a mutex as well
2591 as an integer counter. */
2592 guard_type = targetm.cxx.guard_type ();
2593 guard = build_decl (DECL_SOURCE_LOCATION (decl),
2594 VAR_DECL, sname, guard_type);
2596 /* The guard should have the same linkage as what it guards. */
2597 TREE_PUBLIC (guard) = TREE_PUBLIC (decl);
2598 TREE_STATIC (guard) = TREE_STATIC (decl);
2599 DECL_COMMON (guard) = DECL_COMMON (decl);
2600 DECL_COMDAT (guard) = DECL_COMDAT (decl);
2601 if (DECL_ONE_ONLY (decl))
2602 make_decl_one_only (guard, cxx_comdat_group (guard));
2603 if (TREE_PUBLIC (decl))
2604 DECL_WEAK (guard) = DECL_WEAK (decl);
2605 DECL_VISIBILITY (guard) = DECL_VISIBILITY (decl);
2606 DECL_VISIBILITY_SPECIFIED (guard) = DECL_VISIBILITY_SPECIFIED (decl);
2608 DECL_ARTIFICIAL (guard) = 1;
2609 DECL_IGNORED_P (guard) = 1;
2610 TREE_USED (guard) = 1;
2611 pushdecl_top_level_and_finish (guard, NULL_TREE);
2616 /* Return those bits of the GUARD variable that should be set when the
2617 guarded entity is actually initialized. */
2620 get_guard_bits (tree guard)
2622 if (!targetm.cxx.guard_mask_bit ())
2624 /* We only set the first byte of the guard, in order to leave room
2625 for a mutex in the high-order bits. */
2626 guard = build1 (ADDR_EXPR,
2627 build_pointer_type (TREE_TYPE (guard)),
2629 guard = build1 (NOP_EXPR,
2630 build_pointer_type (char_type_node),
2632 guard = build1 (INDIRECT_REF, char_type_node, guard);
2638 /* Return an expression which determines whether or not the GUARD
2639 variable has already been initialized. */
2642 get_guard_cond (tree guard)
2646 /* Check to see if the GUARD is zero. */
2647 guard = get_guard_bits (guard);
2649 /* Mask off all but the low bit. */
2650 if (targetm.cxx.guard_mask_bit ())
2652 guard_value = integer_one_node;
2653 if (!same_type_p (TREE_TYPE (guard_value), TREE_TYPE (guard)))
2654 guard_value = convert (TREE_TYPE (guard), guard_value);
2655 guard = cp_build_binary_op (input_location,
2656 BIT_AND_EXPR, guard, guard_value,
2657 tf_warning_or_error);
2660 guard_value = integer_zero_node;
2661 if (!same_type_p (TREE_TYPE (guard_value), TREE_TYPE (guard)))
2662 guard_value = convert (TREE_TYPE (guard), guard_value);
2663 return cp_build_binary_op (input_location,
2664 EQ_EXPR, guard, guard_value,
2665 tf_warning_or_error);
2668 /* Return an expression which sets the GUARD variable, indicating that
2669 the variable being guarded has been initialized. */
2672 set_guard (tree guard)
2676 /* Set the GUARD to one. */
2677 guard = get_guard_bits (guard);
2678 guard_init = integer_one_node;
2679 if (!same_type_p (TREE_TYPE (guard_init), TREE_TYPE (guard)))
2680 guard_init = convert (TREE_TYPE (guard), guard_init);
2681 return cp_build_modify_expr (guard, NOP_EXPR, guard_init,
2682 tf_warning_or_error);
2685 /* Start the process of running a particular set of global constructors
2686 or destructors. Subroutine of do_[cd]tors. */
2689 start_objects (int method_type, int initp)
2695 /* Make ctor or dtor function. METHOD_TYPE may be 'I' or 'D'. */
2697 if (initp != DEFAULT_INIT_PRIORITY)
2707 sprintf (type, "%c%c%.5u", method_type, joiner, initp);
2710 sprintf (type, "%c", method_type);
2712 fndecl = build_lang_decl (FUNCTION_DECL,
2713 get_file_function_name (type),
2714 build_function_type (void_type_node,
2716 start_preparsed_function (fndecl, /*attrs=*/NULL_TREE, SF_PRE_PARSED);
2718 TREE_PUBLIC (current_function_decl) = 0;
2720 /* Mark as artificial because it's not explicitly in the user's
2722 DECL_ARTIFICIAL (current_function_decl) = 1;
2724 /* Mark this declaration as used to avoid spurious warnings. */
2725 TREE_USED (current_function_decl) = 1;
2727 /* Mark this function as a global constructor or destructor. */
2728 if (method_type == 'I')
2729 DECL_GLOBAL_CTOR_P (current_function_decl) = 1;
2731 DECL_GLOBAL_DTOR_P (current_function_decl) = 1;
2733 body = begin_compound_stmt (BCS_FN_BODY);
2738 /* Finish the process of running a particular set of global constructors
2739 or destructors. Subroutine of do_[cd]tors. */
2742 finish_objects (int method_type, int initp, tree body)
2747 finish_compound_stmt (body);
2748 fn = finish_function (0);
2750 if (method_type == 'I')
2752 DECL_STATIC_CONSTRUCTOR (fn) = 1;
2753 decl_init_priority_insert (fn, initp);
2757 DECL_STATIC_DESTRUCTOR (fn) = 1;
2758 decl_fini_priority_insert (fn, initp);
2761 expand_or_defer_fn (fn);
2764 /* The names of the parameters to the function created to handle
2765 initializations and destructions for objects with static storage
2767 #define INITIALIZE_P_IDENTIFIER "__initialize_p"
2768 #define PRIORITY_IDENTIFIER "__priority"
2770 /* The name of the function we create to handle initializations and
2771 destructions for objects with static storage duration. */
2772 #define SSDF_IDENTIFIER "__static_initialization_and_destruction"
2774 /* The declaration for the __INITIALIZE_P argument. */
2775 static GTY(()) tree initialize_p_decl;
2777 /* The declaration for the __PRIORITY argument. */
2778 static GTY(()) tree priority_decl;
2780 /* The declaration for the static storage duration function. */
2781 static GTY(()) tree ssdf_decl;
2783 /* All the static storage duration functions created in this
2784 translation unit. */
2785 static GTY(()) VEC(tree,gc) *ssdf_decls;
2787 /* A map from priority levels to information about that priority
2788 level. There may be many such levels, so efficient lookup is
2790 static splay_tree priority_info_map;
2792 /* Begins the generation of the function that will handle all
2793 initialization and destruction of objects with static storage
2794 duration. The function generated takes two parameters of type
2795 `int': __INITIALIZE_P and __PRIORITY. If __INITIALIZE_P is
2796 nonzero, it performs initializations. Otherwise, it performs
2797 destructions. It only performs those initializations or
2798 destructions with the indicated __PRIORITY. The generated function
2801 It is assumed that this function will only be called once per
2802 translation unit. */
2805 start_static_storage_duration_function (unsigned count)
2810 char id[sizeof (SSDF_IDENTIFIER) + 1 /* '\0' */ + 32];
2812 /* Create the identifier for this function. It will be of the form
2813 SSDF_IDENTIFIER_<number>. */
2814 sprintf (id, "%s_%u", SSDF_IDENTIFIER, count);
2816 /* Create the parameters. */
2817 parm_types = void_list_node;
2818 parm_types = tree_cons (NULL_TREE, integer_type_node, parm_types);
2819 parm_types = tree_cons (NULL_TREE, integer_type_node, parm_types);
2820 type = build_function_type (void_type_node, parm_types);
2822 /* Create the FUNCTION_DECL itself. */
2823 ssdf_decl = build_lang_decl (FUNCTION_DECL,
2824 get_identifier (id),
2826 TREE_PUBLIC (ssdf_decl) = 0;
2827 DECL_ARTIFICIAL (ssdf_decl) = 1;
2829 /* Put this function in the list of functions to be called from the
2830 static constructors and destructors. */
2833 ssdf_decls = VEC_alloc (tree, gc, 32);
2835 /* Take this opportunity to initialize the map from priority
2836 numbers to information about that priority level. */
2837 priority_info_map = splay_tree_new (splay_tree_compare_ints,
2838 /*delete_key_fn=*/0,
2839 /*delete_value_fn=*/
2840 (splay_tree_delete_value_fn) &free);
2842 /* We always need to generate functions for the
2843 DEFAULT_INIT_PRIORITY so enter it now. That way when we walk
2844 priorities later, we'll be sure to find the
2845 DEFAULT_INIT_PRIORITY. */
2846 get_priority_info (DEFAULT_INIT_PRIORITY);
2849 VEC_safe_push (tree, gc, ssdf_decls, ssdf_decl);
2851 /* Create the argument list. */
2852 initialize_p_decl = cp_build_parm_decl
2853 (get_identifier (INITIALIZE_P_IDENTIFIER), integer_type_node);
2854 DECL_CONTEXT (initialize_p_decl) = ssdf_decl;
2855 TREE_USED (initialize_p_decl) = 1;
2856 priority_decl = cp_build_parm_decl
2857 (get_identifier (PRIORITY_IDENTIFIER), integer_type_node);
2858 DECL_CONTEXT (priority_decl) = ssdf_decl;
2859 TREE_USED (priority_decl) = 1;
2861 TREE_CHAIN (initialize_p_decl) = priority_decl;
2862 DECL_ARGUMENTS (ssdf_decl) = initialize_p_decl;
2864 /* Put the function in the global scope. */
2865 pushdecl (ssdf_decl);
2867 /* Start the function itself. This is equivalent to declaring the
2870 static void __ssdf (int __initialize_p, init __priority_p);
2872 It is static because we only need to call this function from the
2873 various constructor and destructor functions for this module. */
2874 start_preparsed_function (ssdf_decl,
2875 /*attrs=*/NULL_TREE,
2878 /* Set up the scope of the outermost block in the function. */
2879 body = begin_compound_stmt (BCS_FN_BODY);
2884 /* Finish the generation of the function which performs initialization
2885 and destruction of objects with static storage duration. After
2886 this point, no more such objects can be created. */
2889 finish_static_storage_duration_function (tree body)
2891 /* Close out the function. */
2892 finish_compound_stmt (body);
2893 expand_or_defer_fn (finish_function (0));
2896 /* Return the information about the indicated PRIORITY level. If no
2897 code to handle this level has yet been generated, generate the
2898 appropriate prologue. */
2900 static priority_info
2901 get_priority_info (int priority)
2906 n = splay_tree_lookup (priority_info_map,
2907 (splay_tree_key) priority);
2910 /* Create a new priority information structure, and insert it
2912 pi = XNEW (struct priority_info_s);
2913 pi->initializations_p = 0;
2914 pi->destructions_p = 0;
2915 splay_tree_insert (priority_info_map,
2916 (splay_tree_key) priority,
2917 (splay_tree_value) pi);
2920 pi = (priority_info) n->value;
2925 /* The effective initialization priority of a DECL. */
2927 #define DECL_EFFECTIVE_INIT_PRIORITY(decl) \
2928 ((!DECL_HAS_INIT_PRIORITY_P (decl) || DECL_INIT_PRIORITY (decl) == 0) \
2929 ? DEFAULT_INIT_PRIORITY : DECL_INIT_PRIORITY (decl))
2931 /* Whether a DECL needs a guard to protect it against multiple
2934 #define NEEDS_GUARD_P(decl) (TREE_PUBLIC (decl) && (DECL_COMMON (decl) \
2935 || DECL_ONE_ONLY (decl) \
2936 || DECL_WEAK (decl)))
2938 /* Called from one_static_initialization_or_destruction(),
2940 Walks the initializer list of a global variable and looks for
2941 temporary variables (DECL_NAME() == NULL and DECL_ARTIFICIAL != 0)
2942 and that have their DECL_CONTEXT() == NULL.
2943 For each such temporary variable, set their DECL_CONTEXT() to
2944 the current function. This is necessary because otherwise
2945 some optimizers (enabled by -O2 -fprofile-arcs) might crash
2946 when trying to refer to a temporary variable that does not have
2947 it's DECL_CONTECT() properly set. */
2949 fix_temporary_vars_context_r (tree *node,
2950 int *unused ATTRIBUTE_UNUSED,
2951 void *unused1 ATTRIBUTE_UNUSED)
2953 gcc_assert (current_function_decl);
2955 if (TREE_CODE (*node) == BIND_EXPR)
2959 for (var = BIND_EXPR_VARS (*node); var; var = TREE_CHAIN (var))
2960 if (TREE_CODE (var) == VAR_DECL
2962 && DECL_ARTIFICIAL (var)
2963 && !DECL_CONTEXT (var))
2964 DECL_CONTEXT (var) = current_function_decl;
2970 /* Set up to handle the initialization or destruction of DECL. If
2971 INITP is nonzero, we are initializing the variable. Otherwise, we
2972 are destroying it. */
2975 one_static_initialization_or_destruction (tree decl, tree init, bool initp)
2977 tree guard_if_stmt = NULL_TREE;
2980 /* If we are supposed to destruct and there's a trivial destructor,
2981 nothing has to be done. */
2983 && TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
2986 /* Trick the compiler into thinking we are at the file and line
2987 where DECL was declared so that error-messages make sense, and so
2988 that the debugger will show somewhat sensible file and line
2990 input_location = DECL_SOURCE_LOCATION (decl);
2992 /* Make sure temporary variables in the initialiser all have
2993 their DECL_CONTEXT() set to a value different from NULL_TREE.
2994 This can happen when global variables initialisers are built.
2995 In that case, the DECL_CONTEXT() of the global variables _AND_ of all
2996 the temporary variables that might have been generated in the
2997 accompagning initialisers is NULL_TREE, meaning the variables have been
2998 declared in the global namespace.
2999 What we want to do here is to fix that and make sure the DECL_CONTEXT()
3000 of the temporaries are set to the current function decl. */
3001 cp_walk_tree_without_duplicates (&init,
3002 fix_temporary_vars_context_r,
3009 Access control for implicit calls to the constructors,
3010 the conversion functions, or the destructor called to
3011 create and destroy a static data member is performed as
3012 if these calls appeared in the scope of the member's
3015 we pretend we are in a static member function of the class of
3016 which the DECL is a member. */
3017 if (member_p (decl))
3019 DECL_CONTEXT (current_function_decl) = DECL_CONTEXT (decl);
3020 DECL_STATIC_FUNCTION_P (current_function_decl) = 1;
3023 /* Assume we don't need a guard. */
3025 /* We need a guard if this is an object with external linkage that
3026 might be initialized in more than one place. (For example, a
3027 static data member of a template, when the data member requires
3029 if (NEEDS_GUARD_P (decl))
3033 guard = get_guard (decl);
3035 /* When using __cxa_atexit, we just check the GUARD as we would
3036 for a local static. */
3037 if (flag_use_cxa_atexit)
3039 /* When using __cxa_atexit, we never try to destroy
3040 anything from a static destructor. */
3042 guard_cond = get_guard_cond (guard);
3044 /* If we don't have __cxa_atexit, then we will be running
3045 destructors from .fini sections, or their equivalents. So,
3046 we need to know how many times we've tried to initialize this
3047 object. We do initializations only if the GUARD is zero,
3048 i.e., if we are the first to initialize the variable. We do
3049 destructions only if the GUARD is one, i.e., if we are the
3050 last to destroy the variable. */
3053 = cp_build_binary_op (input_location,
3055 cp_build_unary_op (PREINCREMENT_EXPR,
3058 tf_warning_or_error),
3060 tf_warning_or_error);
3063 = cp_build_binary_op (input_location,
3065 cp_build_unary_op (PREDECREMENT_EXPR,
3068 tf_warning_or_error),
3070 tf_warning_or_error);
3072 guard_if_stmt = begin_if_stmt ();
3073 finish_if_stmt_cond (guard_cond, guard_if_stmt);
3077 /* If we're using __cxa_atexit, we have not already set the GUARD,
3078 so we must do so now. */
3079 if (guard && initp && flag_use_cxa_atexit)
3080 finish_expr_stmt (set_guard (guard));
3082 /* Perform the initialization or destruction. */
3086 finish_expr_stmt (init);
3088 /* If we're using __cxa_atexit, register a function that calls the
3089 destructor for the object. */
3090 if (flag_use_cxa_atexit)
3091 finish_expr_stmt (register_dtor_fn (decl));
3094 finish_expr_stmt (build_cleanup (decl));
3096 /* Finish the guard if-stmt, if necessary. */
3099 finish_then_clause (guard_if_stmt);
3100 finish_if_stmt (guard_if_stmt);
3103 /* Now that we're done with DECL we don't need to pretend to be a
3104 member of its class any longer. */
3105 DECL_CONTEXT (current_function_decl) = NULL_TREE;
3106 DECL_STATIC_FUNCTION_P (current_function_decl) = 0;
3109 /* Generate code to do the initialization or destruction of the decls in VARS,
3110 a TREE_LIST of VAR_DECL with static storage duration.
3111 Whether initialization or destruction is performed is specified by INITP. */
3114 do_static_initialization_or_destruction (tree vars, bool initp)
3116 tree node, init_if_stmt, cond;
3118 /* Build the outer if-stmt to check for initialization or destruction. */
3119 init_if_stmt = begin_if_stmt ();
3120 cond = initp ? integer_one_node : integer_zero_node;
3121 cond = cp_build_binary_op (input_location,
3125 tf_warning_or_error);
3126 finish_if_stmt_cond (cond, init_if_stmt);
3130 tree decl = TREE_VALUE (node);
3131 tree priority_if_stmt;
3135 /* If we don't need a destructor, there's nothing to do. Avoid
3136 creating a possibly empty if-stmt. */
3137 if (!initp && TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
3139 node = TREE_CHAIN (node);
3143 /* Remember that we had an initialization or finalization at this
3145 priority = DECL_EFFECTIVE_INIT_PRIORITY (decl);
3146 pi = get_priority_info (priority);
3148 pi->initializations_p = 1;
3150 pi->destructions_p = 1;
3152 /* Conditionalize this initialization on being in the right priority
3153 and being initializing/finalizing appropriately. */
3154 priority_if_stmt = begin_if_stmt ();
3155 cond = cp_build_binary_op (input_location,
3158 build_int_cst (NULL_TREE, priority),
3159 tf_warning_or_error);
3160 finish_if_stmt_cond (cond, priority_if_stmt);
3162 /* Process initializers with same priority. */
3164 && DECL_EFFECTIVE_INIT_PRIORITY (TREE_VALUE (node)) == priority;
3165 node = TREE_CHAIN (node))
3166 /* Do one initialization or destruction. */
3167 one_static_initialization_or_destruction (TREE_VALUE (node),
3168 TREE_PURPOSE (node), initp);
3170 /* Finish up the priority if-stmt body. */
3171 finish_then_clause (priority_if_stmt);
3172 finish_if_stmt (priority_if_stmt);
3176 /* Finish up the init/destruct if-stmt body. */
3177 finish_then_clause (init_if_stmt);
3178 finish_if_stmt (init_if_stmt);
3181 /* VARS is a list of variables with static storage duration which may
3182 need initialization and/or finalization. Remove those variables
3183 that don't really need to be initialized or finalized, and return
3184 the resulting list. The order in which the variables appear in
3185 VARS is in reverse order of the order in which they should actually
3186 be initialized. The list we return is in the unreversed order;
3187 i.e., the first variable should be initialized first. */
3190 prune_vars_needing_no_initialization (tree *vars)
3193 tree result = NULL_TREE;
3198 tree decl = TREE_VALUE (t);
3199 tree init = TREE_PURPOSE (t);
3201 /* Deal gracefully with error. */
3202 if (decl == error_mark_node)
3204 var = &TREE_CHAIN (t);
3208 /* The only things that can be initialized are variables. */
3209 gcc_assert (TREE_CODE (decl) == VAR_DECL);
3211 /* If this object is not defined, we don't need to do anything
3213 if (DECL_EXTERNAL (decl))
3215 var = &TREE_CHAIN (t);
3219 /* Also, if the initializer already contains errors, we can bail
3221 if (init && TREE_CODE (init) == TREE_LIST
3222 && value_member (error_mark_node, init))
3224 var = &TREE_CHAIN (t);
3228 /* This variable is going to need initialization and/or
3229 finalization, so we add it to the list. */
3230 *var = TREE_CHAIN (t);
3231 TREE_CHAIN (t) = result;
3238 /* Make sure we have told the back end about all the variables in
3242 write_out_vars (tree vars)
3246 for (v = vars; v; v = TREE_CHAIN (v))
3248 tree var = TREE_VALUE (v);
3249 if (!var_finalized_p (var))
3251 import_export_decl (var);
3252 rest_of_decl_compilation (var, 1, 1);
3257 /* Generate a static constructor (if CONSTRUCTOR_P) or destructor
3258 (otherwise) that will initialize all global objects with static
3259 storage duration having the indicated PRIORITY. */
3262 generate_ctor_or_dtor_function (bool constructor_p, int priority,
3271 input_location = *locus;
3273 /* Was: locus->line++; */
3275 /* We use `I' to indicate initialization and `D' to indicate
3277 function_key = constructor_p ? 'I' : 'D';
3279 /* We emit the function lazily, to avoid generating empty
3280 global constructors and destructors. */
3283 /* For Objective-C++, we may need to initialize metadata found in this module.
3284 This must be done _before_ any other static initializations. */
3285 if (c_dialect_objc () && (priority == DEFAULT_INIT_PRIORITY)
3286 && constructor_p && objc_static_init_needed_p ())
3288 body = start_objects (function_key, priority);
3289 objc_generate_static_init_call (NULL_TREE);
3292 /* Call the static storage duration function with appropriate
3294 for (i = 0; VEC_iterate (tree, ssdf_decls, i, fndecl); ++i)
3296 /* Calls to pure or const functions will expand to nothing. */
3297 if (! (flags_from_decl_or_type (fndecl) & (ECF_CONST | ECF_PURE)))
3300 body = start_objects (function_key, priority);
3302 arguments = tree_cons (NULL_TREE,
3303 build_int_cst (NULL_TREE, priority),
3305 arguments = tree_cons (NULL_TREE,
3306 build_int_cst (NULL_TREE, constructor_p),
3308 finish_expr_stmt (cp_build_function_call (fndecl, arguments,
3309 tf_warning_or_error));
3313 /* Close out the function. */
3315 finish_objects (function_key, priority, body);
3318 /* Generate constructor and destructor functions for the priority
3322 generate_ctor_and_dtor_functions_for_priority (splay_tree_node n, void * data)
3324 location_t *locus = (location_t *) data;
3325 int priority = (int) n->key;
3326 priority_info pi = (priority_info) n->value;
3328 /* Generate the functions themselves, but only if they are really
3330 if (pi->initializations_p)
3331 generate_ctor_or_dtor_function (/*constructor_p=*/true, priority, locus);
3332 if (pi->destructions_p)
3333 generate_ctor_or_dtor_function (/*constructor_p=*/false, priority, locus);
3335 /* Keep iterating. */
3339 /* Called via LANGHOOK_CALLGRAPH_ANALYZE_EXPR. It is supposed to mark
3340 decls referenced from front-end specific constructs; it will be called
3341 only for language-specific tree nodes.
3343 Here we must deal with member pointers. */
3346 cxx_callgraph_analyze_expr (tree *tp, int *walk_subtrees ATTRIBUTE_UNUSED)
3350 switch (TREE_CODE (t))
3353 if (TYPE_PTRMEMFUNC_P (TREE_TYPE (t)))
3354 cgraph_mark_address_taken_node (cgraph_node (PTRMEM_CST_MEMBER (t)));
3357 if (TREE_CODE (BASELINK_FUNCTIONS (t)) == FUNCTION_DECL)
3358 cgraph_mark_address_taken_node (cgraph_node (BASELINK_FUNCTIONS (t)));
3361 if (DECL_VTABLE_OR_VTT_P (t))
3363 /* The ABI requires that all virtual tables be emitted
3364 whenever one of them is. */
3366 for (vtbl = CLASSTYPE_VTABLES (DECL_CONTEXT (t));
3368 vtbl = TREE_CHAIN (vtbl))
3369 mark_decl_referenced (vtbl);
3371 else if (DECL_CONTEXT (t)
3372 && flag_use_repository
3373 && TREE_CODE (DECL_CONTEXT (t)) == FUNCTION_DECL)
3374 /* If we need a static variable in a function, then we
3375 need the containing function. */
3376 mark_decl_referenced (DECL_CONTEXT (t));
3385 /* Java requires that we be able to reference a local address for a
3386 method, and not be confused by PLT entries. If hidden aliases are
3387 supported, collect and return all the functions for which we should
3388 emit a hidden alias. */
3390 static struct pointer_set_t *
3391 collect_candidates_for_java_method_aliases (void)
3393 struct cgraph_node *node;
3394 struct pointer_set_t *candidates = NULL;
3396 #ifndef HAVE_GAS_HIDDEN
3400 for (node = cgraph_nodes; node ; node = node->next)
3402 tree fndecl = node->decl;
3404 if (DECL_CONTEXT (fndecl)
3405 && TYPE_P (DECL_CONTEXT (fndecl))
3406 && TYPE_FOR_JAVA (DECL_CONTEXT (fndecl))
3407 && TARGET_USE_LOCAL_THUNK_ALIAS_P (fndecl))
3409 if (candidates == NULL)
3410 candidates = pointer_set_create ();
3411 pointer_set_insert (candidates, fndecl);
3419 /* Java requires that we be able to reference a local address for a
3420 method, and not be confused by PLT entries. If hidden aliases are
3421 supported, emit one for each java function that we've emitted.
3422 CANDIDATES is the set of FUNCTION_DECLs that were gathered
3423 by collect_candidates_for_java_method_aliases. */
3426 build_java_method_aliases (struct pointer_set_t *candidates)
3428 struct cgraph_node *node;
3430 #ifndef HAVE_GAS_HIDDEN
3434 for (node = cgraph_nodes; node ; node = node->next)
3436 tree fndecl = node->decl;
3438 if (TREE_ASM_WRITTEN (fndecl)
3439 && pointer_set_contains (candidates, fndecl))
3441 /* Mangle the name in a predictable way; we need to reference
3442 this from a java compiled object file. */
3443 tree oid, nid, alias;
3447 oid = DECL_ASSEMBLER_NAME (fndecl);
3448 oname = IDENTIFIER_POINTER (oid);
3449 gcc_assert (oname[0] == '_' && oname[1] == 'Z');
3450 nname = ACONCAT (("_ZGA", oname+2, NULL));
3451 nid = get_identifier (nname);
3453 alias = make_alias_for (fndecl, nid);
3454 TREE_PUBLIC (alias) = 1;
3455 DECL_VISIBILITY (alias) = VISIBILITY_HIDDEN;
3457 assemble_alias (alias, oid);
3462 /* Returns true iff there is a definition available for variable or
3466 decl_defined_p (tree decl)
3468 if (TREE_CODE (decl) == FUNCTION_DECL)
3469 return (DECL_INITIAL (decl) != NULL_TREE);
3472 gcc_assert (TREE_CODE (decl) == VAR_DECL);
3473 return !DECL_EXTERNAL (decl);
3477 /* Complain that DECL uses a type with no linkage but is never defined. */
3480 no_linkage_error (tree decl)
3482 tree t = no_linkage_check (TREE_TYPE (decl), /*relaxed_p=*/false);
3483 if (TYPE_ANONYMOUS_P (t))
3485 permerror (0, "%q+#D, declared using anonymous type, "
3486 "is used but never defined", decl);
3487 if (is_typedef_decl (TYPE_NAME (t)))
3488 permerror (0, "%q+#D does not refer to the unqualified type, "
3489 "so it is not used for linkage", TYPE_NAME (t));
3492 permerror (0, "%q+#D, declared using local type %qT, "
3493 "is used but never defined", decl, t);
3496 /* This routine is called at the end of compilation.
3497 Its job is to create all the code needed to initialize and
3498 destroy the global aggregates. We do the destruction
3499 first, since that way we only need to reverse the decls once. */
3502 cp_write_global_declarations (void)
3508 unsigned ssdf_count = 0;
3511 struct pointer_set_t *candidates;
3513 locus = input_location;
3516 /* Bad parse errors. Just forget about it. */
3517 if (! global_bindings_p () || current_class_type || decl_namespace_list)
3521 c_common_write_pch ();
3523 /* FIXME - huh? was input_line -= 1;*/
3525 /* We now have to write out all the stuff we put off writing out.
3528 o Template specializations that we have not yet instantiated,
3529 but which are needed.
3530 o Initialization and destruction for non-local objects with
3531 static storage duration. (Local objects with static storage
3532 duration are initialized when their scope is first entered,
3533 and are cleaned up via atexit.)
3534 o Virtual function tables.
3536 All of these may cause others to be needed. For example,
3537 instantiating one function may cause another to be needed, and
3538 generating the initializer for an object may cause templates to be
3539 instantiated, etc., etc. */
3541 timevar_push (TV_VARCONST);
3543 emit_support_tinfos ();
3552 /* If there are templates that we've put off instantiating, do
3554 instantiate_pending_templates (retries);
3557 /* Write out virtual tables as required. Note that writing out
3558 the virtual table for a template class may cause the
3559 instantiation of members of that class. If we write out
3560 vtables then we remove the class from our list so we don't
3561 have to look at it again. */
3563 while (keyed_classes != NULL_TREE
3564 && maybe_emit_vtables (TREE_VALUE (keyed_classes)))
3567 keyed_classes = TREE_CHAIN (keyed_classes);
3573 tree next = TREE_CHAIN (t);
3577 if (maybe_emit_vtables (TREE_VALUE (next)))
3580 TREE_CHAIN (t) = TREE_CHAIN (next);
3585 next = TREE_CHAIN (t);
3589 /* Write out needed type info variables. We have to be careful
3590 looping through unemitted decls, because emit_tinfo_decl may
3591 cause other variables to be needed. New elements will be
3592 appended, and we remove from the vector those that actually
3594 for (i = VEC_length (tree, unemitted_tinfo_decls);
3595 VEC_iterate (tree, unemitted_tinfo_decls, --i, t);)
3596 if (emit_tinfo_decl (t))
3599 VEC_unordered_remove (tree, unemitted_tinfo_decls, i);
3602 /* The list of objects with static storage duration is built up
3603 in reverse order. We clear STATIC_AGGREGATES so that any new
3604 aggregates added during the initialization of these will be
3605 initialized in the correct order when we next come around the
3607 vars = prune_vars_needing_no_initialization (&static_aggregates);
3611 /* We need to start a new initialization function each time
3612 through the loop. That's because we need to know which
3613 vtables have been referenced, and TREE_SYMBOL_REFERENCED
3614 isn't computed until a function is finished, and written
3615 out. That's a deficiency in the back end. When this is
3616 fixed, these initialization functions could all become
3617 inline, with resulting performance improvements. */
3620 /* Set the line and file, so that it is obviously not from
3622 input_location = locus;
3623 ssdf_body = start_static_storage_duration_function (ssdf_count);
3625 /* Make sure the back end knows about all the variables. */
3626 write_out_vars (vars);
3628 /* First generate code to do all the initializations. */
3630 do_static_initialization_or_destruction (vars, /*initp=*/true);
3632 /* Then, generate code to do all the destructions. Do these
3633 in reverse order so that the most recently constructed
3634 variable is the first destroyed. If we're using
3635 __cxa_atexit, then we don't need to do this; functions
3636 were registered at initialization time to destroy the
3638 if (!flag_use_cxa_atexit && vars)
3640 vars = nreverse (vars);
3641 do_static_initialization_or_destruction (vars, /*initp=*/false);
3646 /* Finish up the static storage duration function for this
3648 input_location = locus;
3649 finish_static_storage_duration_function (ssdf_body);
3651 /* All those initializations and finalizations might cause
3652 us to need more inline functions, more template
3653 instantiations, etc. */
3656 /* ??? was: locus.line++; */
3659 /* Go through the set of inline functions whose bodies have not
3660 been emitted yet. If out-of-line copies of these functions
3661 are required, emit them. */
3662 for (i = 0; VEC_iterate (tree, deferred_fns, i, decl); ++i)
3664 /* Does it need synthesizing? */
3665 if (DECL_DEFAULTED_FN (decl) && ! DECL_INITIAL (decl)
3666 && (! DECL_REALLY_EXTERN (decl) || possibly_inlined_p (decl)))
3668 /* Even though we're already at the top-level, we push
3669 there again. That way, when we pop back a few lines
3670 hence, all of our state is restored. Otherwise,
3671 finish_function doesn't clean things up, and we end
3672 up with CURRENT_FUNCTION_DECL set. */
3673 push_to_top_level ();
3674 /* The decl's location will mark where it was first
3675 needed. Save that so synthesize method can indicate
3676 where it was needed from, in case of error */
3677 input_location = DECL_SOURCE_LOCATION (decl);
3678 synthesize_method (decl);
3679 pop_from_top_level ();
3683 if (!DECL_SAVED_TREE (decl))
3686 /* We lie to the back end, pretending that some functions
3687 are not defined when they really are. This keeps these
3688 functions from being put out unnecessarily. But, we must
3689 stop lying when the functions are referenced, or if they
3690 are not comdat since they need to be put out now. If
3691 DECL_INTERFACE_KNOWN, then we have already set
3692 DECL_EXTERNAL appropriately, so there's no need to check
3693 again, and we do not want to clear DECL_EXTERNAL if a
3694 previous call to import_export_decl set it.
3696 This is done in a separate for cycle, because if some
3697 deferred function is contained in another deferred
3698 function later in deferred_fns varray,
3699 rest_of_compilation would skip this function and we
3700 really cannot expand the same function twice. */
3701 import_export_decl (decl);
3702 if (DECL_NOT_REALLY_EXTERN (decl)
3703 && DECL_INITIAL (decl)
3704 && decl_needed_p (decl))
3706 struct cgraph_node *node = cgraph_get_node (decl), *alias, *next;
3708 DECL_EXTERNAL (decl) = 0;
3709 /* If we mark !DECL_EXTERNAL one of the same body aliases,
3710 we need to mark all of them that way. */
3711 if (node && node->same_body)
3713 DECL_EXTERNAL (node->decl) = 0;
3714 for (alias = node->same_body; alias; alias = alias->next)
3715 DECL_EXTERNAL (alias->decl) = 0;
3717 /* If we mark !DECL_EXTERNAL one of the symbols in some comdat
3718 group, we need to mark all symbols in the same comdat group
3720 if (node->same_comdat_group)
3721 for (next = node->same_comdat_group;
3723 next = next->same_comdat_group)
3725 DECL_EXTERNAL (next->decl) = 0;
3726 if (next->same_body)
3728 for (alias = next->same_body;
3730 alias = alias->next)
3731 DECL_EXTERNAL (alias->decl) = 0;
3736 /* If we're going to need to write this function out, and
3737 there's already a body for it, create RTL for it now.
3738 (There might be no body if this is a method we haven't
3739 gotten around to synthesizing yet.) */
3740 if (!DECL_EXTERNAL (decl)
3741 && decl_needed_p (decl)
3742 && !TREE_ASM_WRITTEN (decl)
3743 && !cgraph_node (decl)->local.finalized)
3745 /* We will output the function; no longer consider it in this
3747 DECL_DEFER_OUTPUT (decl) = 0;
3748 /* Generate RTL for this function now that we know we
3750 expand_or_defer_fn (decl);
3751 /* If we're compiling -fsyntax-only pretend that this
3752 function has been written out so that we don't try to
3754 if (flag_syntax_only)
3755 TREE_ASM_WRITTEN (decl) = 1;
3760 if (walk_namespaces (wrapup_globals_for_namespace, /*data=*/0))
3763 /* Static data members are just like namespace-scope globals. */
3764 for (i = 0; VEC_iterate (tree, pending_statics, i, decl); ++i)
3766 if (var_finalized_p (decl) || DECL_REALLY_EXTERN (decl)
3767 /* Don't write it out if we haven't seen a definition. */
3768 || DECL_IN_AGGR_P (decl))
3770 import_export_decl (decl);
3771 /* If this static data member is needed, provide it to the
3773 if (DECL_NOT_REALLY_EXTERN (decl) && decl_needed_p (decl))
3774 DECL_EXTERNAL (decl) = 0;
3776 if (VEC_length (tree, pending_statics) != 0
3777 && wrapup_global_declarations (VEC_address (tree, pending_statics),
3778 VEC_length (tree, pending_statics)))
3785 /* All used inline functions must have a definition at this point. */
3786 for (i = 0; VEC_iterate (tree, deferred_fns, i, decl); ++i)
3788 if (/* Check online inline functions that were actually used. */
3789 DECL_ODR_USED (decl) && DECL_DECLARED_INLINE_P (decl)
3790 /* If the definition actually was available here, then the
3791 fact that the function was not defined merely represents
3792 that for some reason (use of a template repository,
3793 #pragma interface, etc.) we decided not to emit the
3795 && !DECL_INITIAL (decl)
3796 /* An explicit instantiation can be used to specify
3797 that the body is in another unit. It will have
3798 already verified there was a definition. */
3799 && !DECL_EXPLICIT_INSTANTIATION (decl))
3801 warning (0, "inline function %q+D used but never defined", decl);
3802 /* Avoid a duplicate warning from check_global_declaration_1. */
3803 TREE_NO_WARNING (decl) = 1;
3807 /* So must decls that use a type with no linkage. */
3808 for (i = 0; VEC_iterate (tree, no_linkage_decls, i, decl); ++i)
3809 if (!decl_defined_p (decl))
3810 no_linkage_error (decl);
3812 /* We give C linkage to static constructors and destructors. */
3813 push_lang_context (lang_name_c);
3815 /* Generate initialization and destruction functions for all
3816 priorities for which they are required. */
3817 if (priority_info_map)
3818 splay_tree_foreach (priority_info_map,
3819 generate_ctor_and_dtor_functions_for_priority,
3821 else if (c_dialect_objc () && objc_static_init_needed_p ())
3822 /* If this is obj-c++ and we need a static init, call
3823 generate_ctor_or_dtor_function. */
3824 generate_ctor_or_dtor_function (/*constructor_p=*/true,
3825 DEFAULT_INIT_PRIORITY, &locus);
3827 /* We're done with the splay-tree now. */
3828 if (priority_info_map)
3829 splay_tree_delete (priority_info_map);
3831 /* Generate any missing aliases. */
3832 maybe_apply_pending_pragma_weaks ();
3834 /* We're done with static constructors, so we can go back to "C++"
3836 pop_lang_context ();
3838 /* Collect candidates for Java hidden aliases. */
3839 candidates = collect_candidates_for_java_method_aliases ();
3841 cgraph_finalize_compilation_unit ();
3843 /* Now, issue warnings about static, but not defined, functions,
3844 etc., and emit debugging information. */
3845 walk_namespaces (wrapup_globals_for_namespace, /*data=*/&reconsider);
3846 if (VEC_length (tree, pending_statics) != 0)
3848 check_global_declarations (VEC_address (tree, pending_statics),
3849 VEC_length (tree, pending_statics));
3850 emit_debug_global_declarations (VEC_address (tree, pending_statics),
3851 VEC_length (tree, pending_statics));
3854 /* Generate hidden aliases for Java. */
3857 build_java_method_aliases (candidates);
3858 pointer_set_destroy (candidates);
3863 /* The entire file is now complete. If requested, dump everything
3867 FILE *stream = dump_begin (TDI_tu, &flags);
3871 dump_node (global_namespace, flags & ~TDF_SLIM, stream);
3872 dump_end (TDI_tu, stream);
3876 timevar_pop (TV_VARCONST);
3878 if (flag_detailed_statistics)
3880 dump_tree_statistics ();
3881 dump_time_statistics ();
3883 input_location = locus;
3885 #ifdef ENABLE_CHECKING
3886 validate_conversion_obstack ();
3887 #endif /* ENABLE_CHECKING */
3890 /* FN is an OFFSET_REF, DOTSTAR_EXPR or MEMBER_REF indicating the
3891 function to call in parse-tree form; it has not yet been
3892 semantically analyzed. ARGS are the arguments to the function.
3893 They have already been semantically analyzed. This may change
3897 build_offset_ref_call_from_tree (tree fn, VEC(tree,gc) **args)
3900 VEC(tree,gc) *orig_args = NULL;
3905 object = TREE_OPERAND (fn, 0);
3907 if (processing_template_decl)
3909 gcc_assert (TREE_CODE (fn) == DOTSTAR_EXPR
3910 || TREE_CODE (fn) == MEMBER_REF);
3911 if (type_dependent_expression_p (fn)
3912 || any_type_dependent_arguments_p (*args))
3913 return build_nt_call_vec (fn, *args);
3915 orig_args = make_tree_vector_copy (*args);
3917 /* Transform the arguments and add the implicit "this"
3918 parameter. That must be done before the FN is transformed
3919 because we depend on the form of FN. */
3920 make_args_non_dependent (*args);
3921 object = build_non_dependent_expr (object);
3922 if (TREE_CODE (fn) == DOTSTAR_EXPR)
3923 object = cp_build_unary_op (ADDR_EXPR, object, 0, tf_warning_or_error);
3924 VEC_safe_insert (tree, gc, *args, 0, object);
3925 /* Now that the arguments are done, transform FN. */
3926 fn = build_non_dependent_expr (fn);
3929 /* A qualified name corresponding to a bound pointer-to-member is
3930 represented as an OFFSET_REF:
3932 struct B { void g(); };
3934 void B::g() { (this->*p)(); } */
3935 if (TREE_CODE (fn) == OFFSET_REF)
3937 tree object_addr = cp_build_unary_op (ADDR_EXPR, object, 0,
3938 tf_warning_or_error);
3939 fn = TREE_OPERAND (fn, 1);
3940 fn = get_member_function_from_ptrfunc (&object_addr, fn);
3941 VEC_safe_insert (tree, gc, *args, 0, object_addr);
3944 expr = cp_build_function_call_vec (fn, args, tf_warning_or_error);
3945 if (processing_template_decl && expr != error_mark_node)
3946 expr = build_min_non_dep_call_vec (expr, orig_fn, orig_args);
3948 if (orig_args != NULL)
3949 release_tree_vector (orig_args);
3956 check_default_args (tree x)
3958 tree arg = TYPE_ARG_TYPES (TREE_TYPE (x));
3959 bool saw_def = false;
3960 int i = 0 - (TREE_CODE (TREE_TYPE (x)) == METHOD_TYPE);
3961 for (; arg && arg != void_list_node; arg = TREE_CHAIN (arg), ++i)
3963 if (TREE_PURPOSE (arg))
3967 error ("default argument missing for parameter %P of %q+#D", i, x);
3968 TREE_PURPOSE (arg) = error_mark_node;
3973 /* Return true if function DECL can be inlined. This is used to force
3974 instantiation of methods that might be interesting for inlining. */
3976 possibly_inlined_p (tree decl)
3978 gcc_assert (TREE_CODE (decl) == FUNCTION_DECL);
3979 if (DECL_UNINLINABLE (decl))
3981 if (!optimize || pragma_java_exceptions)
3982 return DECL_DECLARED_INLINE_P (decl);
3983 /* When optimizing, we might inline everything when flatten
3984 attribute or heuristics inlining for size or autoinlining
3989 /* Mark DECL (either a _DECL or a BASELINK) as "used" in the program.
3990 If DECL is a specialization or implicitly declared class member,
3991 generate the actual definition. */
3994 mark_used (tree decl)
3996 HOST_WIDE_INT saved_processing_template_decl = 0;
3998 /* If DECL is a BASELINK for a single function, then treat it just
3999 like the DECL for the function. Otherwise, if the BASELINK is
4000 for an overloaded function, we don't know which function was
4001 actually used until after overload resolution. */
4002 if (TREE_CODE (decl) == BASELINK)
4004 decl = BASELINK_FUNCTIONS (decl);
4005 if (really_overloaded_fn (decl))
4007 decl = OVL_CURRENT (decl);
4010 /* Set TREE_USED for the benefit of -Wunused. */
4011 TREE_USED (decl) = 1;
4012 if (DECL_CLONED_FUNCTION_P (decl))
4013 TREE_USED (DECL_CLONED_FUNCTION (decl)) = 1;
4015 if (TREE_CODE (decl) == FUNCTION_DECL
4016 && DECL_DELETED_FN (decl))
4018 if (DECL_ARTIFICIAL (decl))
4020 if (DECL_OVERLOADED_OPERATOR_P (decl) == TYPE_EXPR
4021 && LAMBDA_TYPE_P (DECL_CONTEXT (decl)))
4023 /* We mark a lambda conversion op as deleted if we can't
4024 generate it properly; see maybe_add_lambda_conv_op. */
4025 sorry ("converting lambda which uses %<...%> to "
4026 "function pointer");
4030 error ("deleted function %q+D", decl);
4031 error ("used here");
4034 /* If we don't need a value, then we don't need to synthesize DECL. */
4035 if (cp_unevaluated_operand != 0)
4038 /* We can only check DECL_ODR_USED on variables or functions with
4039 DECL_LANG_SPECIFIC set, and these are also the only decls that we
4040 might need special handling for. */
4041 if ((TREE_CODE (decl) != VAR_DECL && TREE_CODE (decl) != FUNCTION_DECL)
4042 || DECL_LANG_SPECIFIC (decl) == NULL
4043 || DECL_THUNK_P (decl))
4046 /* We only want to do this processing once. We don't need to keep trying
4047 to instantiate inline templates, because unit-at-a-time will make sure
4048 we get them compiled before functions that want to inline them. */
4049 if (DECL_ODR_USED (decl))
4052 /* If within finish_function, defer the rest until that function
4053 finishes, otherwise it might recurse. */
4054 if (defer_mark_used_calls)
4056 VEC_safe_push (tree, gc, deferred_mark_used_calls, decl);
4060 /* Normally, we can wait until instantiation-time to synthesize
4061 DECL. However, if DECL is a static data member initialized with
4062 a constant, we need the value right now because a reference to
4063 such a data member is not value-dependent. */
4064 if (TREE_CODE (decl) == VAR_DECL
4065 && DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl)
4066 && DECL_CLASS_SCOPE_P (decl))
4068 /* Don't try to instantiate members of dependent types. We
4069 cannot just use dependent_type_p here because this function
4070 may be called from fold_non_dependent_expr, and then we may
4071 see dependent types, even though processing_template_decl
4073 if (CLASSTYPE_TEMPLATE_INFO ((DECL_CONTEXT (decl)))
4074 && uses_template_parms (CLASSTYPE_TI_ARGS (DECL_CONTEXT (decl))))
4076 /* Pretend that we are not in a template, even if we are, so
4077 that the static data member initializer will be processed. */
4078 saved_processing_template_decl = processing_template_decl;
4079 processing_template_decl = 0;
4082 if (processing_template_decl)
4085 DECL_ODR_USED (decl) = 1;
4086 if (DECL_CLONED_FUNCTION_P (decl))
4087 DECL_ODR_USED (DECL_CLONED_FUNCTION (decl)) = 1;
4089 /* DR 757: A type without linkage shall not be used as the type of a
4090 variable or function with linkage, unless
4091 o the variable or function has extern "C" linkage (7.5 [dcl.link]), or
4092 o the variable or function is not used (3.2 [basic.def.odr]) or is
4093 defined in the same translation unit. */
4094 if (cxx_dialect > cxx98
4095 && decl_linkage (decl) != lk_none
4096 && !DECL_EXTERN_C_P (decl)
4097 && !DECL_ARTIFICIAL (decl)
4098 && !decl_defined_p (decl)
4099 && no_linkage_check (TREE_TYPE (decl), /*relaxed_p=*/false))
4101 if (is_local_extern (decl))
4102 /* There's no way to define a local extern, and adding it to
4103 the vector interferes with GC, so give an error now. */
4104 no_linkage_error (decl);
4106 VEC_safe_push (tree, gc, no_linkage_decls, decl);
4109 if (TREE_CODE (decl) == FUNCTION_DECL && DECL_DECLARED_INLINE_P (decl)
4110 && !DECL_INITIAL (decl) && !DECL_ARTIFICIAL (decl))
4111 /* Remember it, so we can check it was defined. */
4112 note_vague_linkage_fn (decl);
4114 /* Is it a synthesized method that needs to be synthesized? */
4115 if (TREE_CODE (decl) == FUNCTION_DECL
4116 && DECL_NONSTATIC_MEMBER_FUNCTION_P (decl)
4117 && DECL_DEFAULTED_FN (decl)
4118 && ! DECL_INITIAL (decl))
4120 /* Remember the current location for a function we will end up
4121 synthesizing. Then we can inform the user where it was
4122 required in the case of error. */
4123 DECL_SOURCE_LOCATION (decl) = input_location;
4125 /* Synthesizing an implicitly defined member function will result in
4126 garbage collection. We must treat this situation as if we were
4127 within the body of a function so as to avoid collecting live data
4128 on the stack (such as overload resolution candidates).
4130 We could just let cp_write_global_declarations handle synthesizing
4131 this function, since we just added it to deferred_fns, but doing
4132 it at the use site produces better error messages. */
4134 synthesize_method (decl);
4136 /* If this is a synthesized method we don't need to
4137 do the instantiation test below. */
4139 else if ((TREE_CODE (decl) == FUNCTION_DECL || TREE_CODE (decl) == VAR_DECL)
4140 && DECL_TEMPLATE_INFO (decl)
4141 && (!DECL_EXPLICIT_INSTANTIATION (decl)
4142 || always_instantiate_p (decl)))
4143 /* If this is a function or variable that is an instance of some
4144 template, we now know that we will need to actually do the
4145 instantiation. We check that DECL is not an explicit
4146 instantiation because that is not checked in instantiate_decl.
4148 We put off instantiating functions in order to improve compile
4149 times. Maintaining a stack of active functions is expensive,
4150 and the inliner knows to instantiate any functions it might
4151 need. Therefore, we always try to defer instantiation. */
4152 instantiate_decl (decl, /*defer_ok=*/true,
4153 /*expl_inst_class_mem_p=*/false);
4155 processing_template_decl = saved_processing_template_decl;
4158 #include "gt-cp-decl2.h"